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30
2018-09

Is the cause of the boiler feed water pump reversing during operation?

Time of issue: : 2018-09--30
1. The phenomenon that the boiler feed water pump reverses during operation (1) The flow at the inlet of the feed water pump is zero. (2) The speed of the feed water pump rises sharply when the opening of the scoop tube remains unchanged. (3) The feedwater flow rate drops significantly, which often triggers the action of the low water level protection of the steam drum. (4) The temperature of the bearing of the feedwater pump rises rapidly. (5) Fusible plugs on the spot or already melted, spray a lot of oil outward.        2. Reasons for the reversal of the boiler feed water pump during operation The reversal of the feedwater pump occurs during the start and stop (including tripping) of the unit to switch the water supply mode. When the outlet pressure of the running steam-driven feedwater pump is higher than the outlet pressure of the feedwater pump, the outlet door of the feedwater pump is in the open state. The return valve jams and is not closed tightly, which causes the electric feed water pump to reverse. 3. How to deal with the reversal of the boiler feed water pump during operation (1) When confirming that the feed water pump is reversed, immediately close the electric door of the electric feed water pump outlet, and start the auxiliary oil pump of the electric feed water pump at the same time. (2) Adjust the feedwater flow during the time when the electric valve at the outlet of the feedwater pump is closed, maintain the water level of the steam drum, and pay attention to the running speed of the steam-driven feedwater pump and the opening of the steam inlet valve not exceeding the limit. The boiler can cooperate to reduce the load. (3) Adjust the opening of the spoon tube according to the specific situation. The scoop tube opening is large, the reverse torque is large, and the axial thrust changes direction easily to damage the equipment; the scoop tube opening is small, the reverse resistance is small, and the flying speed is large. (4) It is forbidden to shut down the feedwater pump motor, except for protection actions. Because after clicking Stop, the motor reverses along with the feedwater pump, and the oil pump driven by the pump wheel reverses. There is a check valve at the outlet of the working oil pump, so that the feedwater pump cuts off the oil and burns the tiles. (5) Inspect the feedwater pump on the spot, disassemble it for inspection if necessary, overhaul the check valve of the feedwater pump, and put it into standby after the test action is flexible and reliable. 4. Prevention of reversal during operation of boiler feed water pump (1) When trying to start the feedwater pump, check whether the recirculation door is open, and the feedwater pump should be run without load with the outlet door closed. (2) Before stopping the feed water pump, close the electric outlet door. (3) When the feedwater pump is incorporated into the system, increase the speed of the electric feedwater pump to bring the feedwater pump close to the outlet pressure of the steam-driven feedwater pump, and then open the pump outlet door. (4) When increasing the speed of the electric pump when the feedwater pump is connected, it should be noted that the inlet pressure and speed of the feedwater pump rise steadily without large fluctuations, the outlet flow does not fluctuate significantly, and the feedwater flow does not suddenly decrease. (5) When the feedwater pump is in standby to open the outlet door, there should be inspectors on standby at the outlet door control switch and the feedwater pump site, pay attention to whether the rotor is rotating, and the CRT monitors whether the speed and outlet pressure of the electric feedwater pump change. Invert the signal. If the electric feed water pump is found to be reversed, the outlet door should be closed immediately.
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23
2018-05

How to buy a reliable multi-stage pump for mining?

Time of issue: : 2018-05--23
The core product of the mine drainage system, the mine multi-stage pump, as one of the important guarantees for maintaining mine safety, shoulders a huge responsibility. Therefore, buying a reliable mine multi-stage pump can more effectively guarantee mine production. Safety.     实地考察   So the question is, how can I buy a high-quality multi-stage pump for mining? As long as you follow the following five steps, you can see all the routines and really buy quality products. In the first step, you have to find out the real working conditions of the mine, how big the flow is, how high the lift is, so that you can do better matching. Bad matching is not only inefficient, but also the service life will be shortened. The choice of mining multi-stage pump is not the bigger the better, nor the smaller the better, but according to the actual situation to make dynamic matching, choose the most suitable for your own mining multi-stage pump. The second step is to find mining multi-stage pump manufacturers through various channels. You can start with friends, colleagues, dealers, online, etc., and find some more professional mining multi-stage pump manufacturers. The third step is to make a comprehensive comparison and verification of the credit status of the water pump manufacturers, and select two or three with stronger strength.     Field trips   The fourth step is to conduct on-site inspections of the selected manufacturers (go to their production plants instead of distribution outlets). This step is particularly critical. Because the previous information, credit and other content are all words of one family, there are different degrees of exaggeration, and further field inspections and verifications are needed to see their scale, production equipment, product warehouse inventory, R&D level, production management level, and product quality inspection level. And so on, compare the credit information provided before to ensure that there are no errors and the information is true and valid. After this step, a comprehensive ranking is performed on the selected manufacturers. The fifth step is to test the product application cases on the spot, and select the product use cases advertised by the manufacturer for on-site inspections to determine whether it really exists. In addition, you can learn about the product usage, failure rate, after-sales guarantee capability and other comprehensive usage information from the side . At the same time, after investigating the case, you can also understand the use of others, learn from each other, and improve your own use and management level.     Field trips   If you strictly follow the above five steps, then congratulations, the mining multi-stage pump you purchased must be a reliable quality product. For excessive publicity on the Internet, please be sure to polish it up. For both eyes, it is best to conduct a field survey. After all, many people are good at creating momentum and PS technology is very powerful. After the on-site inspection, these routines will have nowhere to hide, which will also minimize the hidden dangers of mine drainage systems and create a safer and more reliable production environment.
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24
2018-05

Upgraded self-balancing multi-stage pumps in the mine pump room, saving more than 1 million in costs a year

Time of issue: : 2018-05--24
Shanxi Jiexiu Yitang Qingyun Coal Industry Co., Ltd.At the beginning of 2014, Shanxi Jiexiu Yitang Qingyun Coal Industry Co., Ltd. (mine field area is 6.5394 square kilometers, reserves 76.85 million tons, production capacity 900,000 tons per year, mine hydrogeological classification grade is medium, coal seam spontaneous combustion tendency is Level II, the gas level is a gas mine, and the mineable coal seams are all high-quality main coking coal.) In Zibo, Shandong, three coal mines used ordinary drainage multi-stage pumps (with balance discs) were purchased for use as underground mine drainage. In the process, it was discovered that the failure rate of the water pump was too high. The annual maintenance cost of parts was as much as 1.3 million yuan, which far exceeded the purchase cost of the multi-stage pump itself. It also required frequent and repeated maintenance, which consumed a lot of manpower and material resources. Brings huge risks to coal mine production safety.     Downhole pump room      After simple disassembly, assembly and replacement, two new coal mine-specific self-balancing multi-stage pumps started draining operations smoothly. During operation, not only the failure rate was greatly reduced, but also the efficiency was significantly improved. The specific manifestations are as follows: First, the new and old water pumps are also equipped with 1000KW motors, the original drainage operation, the old multi-stage pump needs to work 12 hours a day, and the self-balancing multi-stage pump only needs 8 hours of work; Second, at the same time, due to the high NPSH of the old water pump, two 45KW submersible pumps at the inlet of the pump house need to be equipped for water feeding. After the self-balancing multi-stage pump is running, the water feeding submersible pump is cancelled, and the efficiency is still better than before. Substantially improved; Third, the maintenance cost is greatly reduced. The annual maintenance cost of the old multi-stage pump is as much as more than 1.3 million. The self-balancing multi-stage pump works for more than a year, and the repair parts cost only about 300,000, which greatly reduces the after-sales maintenance cost. Moreover, the failure rate is greatly reduced, and coal mine production is safer and more assured. Fourth, operation and maintenance costs have been greatly reduced. According to the statistics of operation data for more than a year, the annual electricity cost is saved by about 350,000, and the maintenance cost is saved by about 1 million. Without considering the labor cost, the annual cost savings can reach 1.35 million, with considerable benefits. Changsha Canon General Pump Industry Co., Ltd. has been focusing on the research and development of multi-stage pumps for 35 years. With its independent intellectual property rights, it has promoted the upgrade of ordinary multi-stage pumps with balancing discs to self-balancing multi-stage pumps. Nearly 50,000 sets have been promoted in the market, which has brought a new drainage upgrade experience and lower comprehensive use costs to customers in the mining, water conservancy and boiler industries.  
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09
2020-06

Overview of China Water Pump Industry

Time of issue: : 2020-06--09
Overview of China Pump Industry70% of our country's pump products are centrifugal pumps, and rotary and reciprocating positive displacement pumps account for about 18%. It can be seen that horizontal multistage centrifugal pumps occupy an absolute position in pump products. In recent years, the domestic pump industry has grown at an annual rate of 11%-12%, which is higher than the growth rate of the world pump industry. This is mainly due to the gradual maturity of the domestic market and the continuous expansion of demand.    According to statistics, my country has more than 2,000 pump manufacturers of a certain scale. The entire pump industry produces about 450 series and more than 5000 varieties. General pumps can basically be designed and produced in China. Since the 1980s, my country has successively introduced more than 100 series and more than 2,000 varieties, which not only greatly impacted the domestic backward pump industry market, but also narrowed the gap with foreign products. In addition, through the production method of joint ventures and cooperation with foreign countries, the technical level of key pumps in my country is approaching the advanced level of similar foreign pump products.   From the current situation, the domestic pump manufacturing industry is generally composed of three parts of enterprises. The three parts of enterprises are: state-owned enterprises that have undergone shareholding reforms; joint-venture and foreign-controlled joint-stock enterprises and a large number of private enterprises. From the analysis of sales performance in recent years, the top pump manufacturers are undoubtedly large private pump manufacturers. They not only rank among the high-end of the pump manufacturing industry and become the backbone of the pump manufacturing industry, but also have the ability to follow-up development. However, the large number of small and medium-sized private enterprises are still at the lower end of the industrial chain. If they do not seek progress and do not think about joint development, they may be unsustainable in the long run. Although the state-owned enterprises after the shareholding system reform have struggled for quite some time, the gratifying thing is Integration and reorganization have gradually come out of the trough and become a strong force in the pump manufacturing industry; joint ventures, foreign-owned and even wholly-owned enterprises, currently occupy an important position in the domestic pump manufacturing industry. Some formerly experienced large-scale state-owned enterprises exchanged their market, land and human resources for technology shares of foreign pump manufacturers. This aspect allows us to rapidly improve the level of certain key pumps, and at the same time makes these joint ventures or foreign-funded enterprises themselves quickly become popular in China. However, it should also be noted that most of the pumps manufactured by these companies are still in the scope of ordinary pump manufacturing, and the really urgently needed high-end products still need to be imported from abroad.    Progress and gaps in domestic pump products   The development of domestic pump products Due to the expansion of domestic demand in recent years, the domestic pump industry has gained a certain development space. As a result, multi-stage pump products have made some new progress. This is reflected in the increase in the variety and specifications of process pumps; some process pumps that rely on imported technology have already been produced. Serialization, some old products have also been improved on the basis of absorbing imported technology. Small flow and high head pumps with low specific revolutions, corrosion-resistant pumps and sealless pumps all expand the supply space. Especially the key process pumps and large-scale water pumps, such as the hydrogenation feed pumps used in the petrochemical industry, radiant furnace feed pumps, vertical and horizontal high-speed pumps, cryogenic pumps, and many other high-end pumps, have gone through the tireless efforts of manufacturers and users Efforts have been successfully developed and applied. In addition, some pump manufacturers can provide automatic monitoring and control technology according to user requirements to ensure the safe and reliable operation of key parts of the pump in the high-efficiency area. According to statistics, domestic pumps can meet 85% of domestic demand, but there are still some urgently needed high-end pumps that need to be imported.   The gap with foreign products    Although my country's pump manufacturing industry has made considerable achievements, it should be noted that there is still a certain gap compared with foreign products. The efficiency of a considerable number of domestic pumps is 5%~10% lower than that of developed countries.    Generally speaking, the varieties and specifications of domestic pumps are still small, and the product type spectrum speci
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21
2018-07

The birth of the first domestic self-balancing multi-stage pump for mining--Canon Action

Time of issue: : 2018-07--21
As early as 2007, China's coal mines were in a period of rapid development. As the drainage system of the three core safety systems of coal mines, there was no multistage pump specially equipped with it. The multistage pumps used were borrowed from the market. The clean water pumps are closely matched. Due to the complex water quality of the mine underground and the large number of impurity particles, the traditional ordinary clean water pumps cannot meet the requirements of mine drainage well, resulting in a large number of problems:        First, the failure rate is high. Ordinary multi-stage pumps use a balance plate to balance the axial force generated by high-pressure water, which will cause a large degree of wear when starting and stopping. This situation is particularly serious when the water is large and large. , Resulting in low product life and high failure rate, affecting the safety of underground drainage. Second, the anti-cavitation performance is poor. Ordinary multi-stage pumps have been used on a large scale in China for decades. Due to the domestic design and processing and casting capabilities, the anti-cavitation performance of domestic water pumps has always been a short board. The suction range is limited, resulting in the low utilization rate of the coal mine's sump. Third, the response to emergencies is poor. Common multi-stage pumps are all land pumps and cannot be submerged under water for drainage operations. Once a sudden water inrush occurs, the pump house cannot be drained after it is flooded, and it is impossible to carry out mine rescue. . Fourth, the operation is complicated. The drinking water filling operation process of the ordinary multi-stage pump at the start-up stage is complicated. It is generally divided into vacuum filling drinking water, manual filling drinking water, and bottom submersible pump feeding. Once the drinking water is not filled enough, when starting the machine It is easy to damage the balance plate and cause the pump to fail to work normally. The instability of the main drainage pumps in these mines also exacerbated the occurrence of mine flooding accidents. According to incomplete statistics, there were 63 flooding accidents nationwide in 2004, 66 in 2005, 42 in 2006, and 41 in 2007. Vicious accidents have occurred from time to time, showing a high trend. In response to the above-mentioned problems, after careful investigation and summary, Canon Pumps decided to overcome these problems and developed a multi-stage pump for mines in the true sense, contributing to the promotion of China’s mine construction and the reduction of mine flooding accidents. A strength, but also to open up the sky of Canon pump industry in the mining field. So Canon Pump decided to set up a project to develop new products to completely solve the problem of mine drainage and make its own contribution to the national mine drainage business. For this purpose, Canon Pumps has done product research and development in the following directions: 1. Split multi-stage pump: completely solve the problem of excessive axial force of the multi-stage pump causing damage to the balance disc. The pump always works in a state of axial force balance, reducing the failure rate of mine drainage pumps and ensuring safe production in mines ; Solve the problem of poor anti-cavitation performance of multi-stage pumps, increase the utilization rate of the sump, maintain a higher safe water level margin of the sump, better respond to sudden water inrush, and avoid flooding in the pump room. The maintenance is particularly simple, the middle is directly opened, the installation and disassembly are simple, and the maintenance time is greatly shortened. 2, self-priming multi-stage pump; to solve the problem of complicated operation in the stage of multi-stage pump filling and drinking water, the self-priming type is used to fill the drinking water in one step to avoid improper manual operation that causes the drinking water to be turned on and damages the pump. 3. Amphibious multi-stage pump; solves the problem of the failure of the water pump in flooding under the sudden large amount of water inrush, and ensures that the drainage system can continue to perform drainage operations in any state to ensure the safety of the mine. 4. Self-balancing multi-stage pump; solve the problems of high failure rate, short life, unstable working condition, low continuous working efficiency and so on.
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16
2018-05

What is the price difference of the homogeneous competition of multistage centrifugal pumps?

Time of issue: : 2018-05--16
There are five differences between the same model multistage centrifugal pump and a multistage pump configured 1. Material of multi-stage centrifugal pump Material is divided into three aspects: 1. Material: Regular manufacturers will equip parts with corresponding materials in accordance with national and industry standards. For example, in the D-type multi-stage centrifugal pump, according to national standards, some parts of the cast iron pump are made of HT250 cast iron instead of HT200, some parts are made of refrigerated cast iron, and some types of balance discs are made of nodular cast iron. Under some conditions The balance ring should be made of copper, and some types of shaft sleeves should be made of stainless steel. But the actual situation is that many manufacturers have not honestly equipped materials according to national standards. Some manufacturers even use counterfeit materials, which are especially common in the field of stainless steel multistage pumps. If stainless steel materials are compared according to standard grades, some manufacturers may have faked it in the casting process. Reduce the content of some precious and non-prime in order to achieve the purpose of reducing costs.     2. Casting quality: Many small and medium-sized manufacturers actually do not have quality inspection links. For the cast blanks, they usually check the appearance. The inspections for sand holes, pores, cracks, and impurities are not strictly implemented in the procedures, and the technical means are not strict. lack of. This link is also a cost-increasing link for manufacturers, relying on the integrity mechanism between the multi-stage centrifugal pump manufacturer and the casting manufacturer. This is the function of the market competition mechanism, which can virtually reduce the cost of enterprises. But it does not mean that it is a good thing that the testing procedures of multi-stage centrifugal pump manufacturers are not strict. 3. Aging treatment of multi-stage centrifugal pump castings: After the multi-stage centrifugal pump castings are cast, there are stresses inside the castings. Generally, depending on the material, there will be different lengths of aging treatment time. It is generally placed outdoors in the sun and rain for a long time. The actual situation is that many manufacturers use vibration to deal with stress in order to grab urgent orders. Of course, this method cannot completely deal with the stress, so it also has a certain impact on the stability of the pump quality.        2. The accuracy of multistage centrifugal pumps The accuracy of multi-stage centrifugal pumps is divided into two aspects: machining accuracy and assembly accuracy. According to national standards, almost every general and mature pump product has national standards, which clearly stipulate that the processing accuracy of each part of the pump should be controlled within a few threads. In fact, many manufacturers do not have a strict quality control system for the control of processing accuracy. There is no corresponding equipment to ensure machining accuracy. For example: For the same shaft, for flaw detection, quenching and tempering, and beating, the rotor parts on the shaft need to be statically balanced and dynamic balance tested. Each part must be controlled during processing and cannot exceed the allowable range. Because one is short of a few threads, and a few added together, the difference is big. The cooperation between the various components of the multi-stage centrifugal pump depends on the tight assembly. If there is a big gap in work everywhere, it will look like people are old and tend to fall apart. Third, the appearance quality of the multi-stage centrifugal pump The appearance quality of a multistage centrifugal pump mainly depends on three aspects: 1. Mold and casting process: The effect of general wooden mold casting is definitely not as good as that of precision casting and lost foam. There are other advanced casting processes. On the one hand, advanced casting processes will increase the cost due to the use of new molds. On the other hand, it has certain advantages due to the reduction of the cost of appearance processing. 2. Appearance treatment: There are many processes, such as polishing, pickling passivation, and electroplating, and the cost is different, and each has its own merits. 3. Paint process: The seemingly simple paint process, in fact, there is a lot to do. If the paint is done well, the appearance of the product can be improved by several grades, and naturally the price can have more room for improvement. Fourth, product packaging and corporate and brand image building The same product, the packaging, the manufacturer and the brand are different, and the feeling is very different. To create high-quality product packaging, the image of the manufacturer and the brand tonality means more price space.        5. The service of the enterprise an
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09
2020-04

Canon Pumps resumes work and reaches full production

Time of issue: : 2020-04--09
Recently, China's epidemic prevention and control has achieved important phased results. More and more companies have shifted from resuming work and production to "Danone reaching production", and the depth and breadth of economic activities have clearly rebounded. Analysts believe that to prevent and control the epidemic is to escort the economy, and to stabilize the economy is to fight the epidemic. The warming up of China's economy not only reflects the great achievements China has made in coordinating the prevention and control of the epidemic and economic and social development, but also brings spring glory to the world economy in deep crisis.     Since the resumption of work on February 10, 2020, Changsha Canon General Pump Industry Co., Ltd. has continued to order orders. With the joint efforts of colleagues across the company, the sales task in the first quarter has been overfulfilled. In order to determine the delivery schedule of the ordered products, and the efficient operation of the equipment in the production workshop, the operators perform their duties and work overtime every day.     "Everyone work harder and load the goods quickly on the trucks. In the second quarter of 2020, let us create another glorious future!" On the morning of April 7, five red trailers drove into the Liuyang High-tech Zone Changsha Canon General Pump Co., Ltd., about After half an hour, full load MD580-60 (flow rate 580 cubic meters per hour, single-stage head 60 meters) (with motor and related auxiliary equipment), MD280-65 (flow rate 280 cubic meters per hour, single-stage head 65 meters) (with Motor and related ancillary equipment) self-balancing mine-use wear-resistant multi-stage pump trailer drives the factory door to a large domestic group company.     Join hands and make great achievements together, and work side by side to compose a wonderful life!" Sales Director Yang's words inspire every Canon!     All ready to go     All ready to go   We are committed to meeting customer needs and solving customer problems. We respect professional technology, quality responsibility, performance orientation, teamwork, and abide by our commitments, and we are dedicated to becoming an international leader with excellent quality and good service. We firmly believe that with the efforts of all of our Canon people, in the history of the development of multi-stage pumps, there will be more Canon pump industry records that will be refreshed by ourselves and continue to grow.
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28
2020-05

Strength certification丨Changsha Canon Pumps and Hunan universities help the valve simulation experiment of Baise project!

Time of issue: : 2020-05--28
On May 23rd, Professor Tong Chengbiao from Hunan Agricultural University, Professor Li Zhipeng from Changsha University of Science and Technology, Professor Chen Yifei from Hunan University/Institute of Hydraulic Analysis, Professors from Lanzhou University of Technology and other famous universities and Anhui Hongxing Valve Co., Ltd. visited our company for the Baise project piston valve. Simulation experiment.     he Changsha Canon General Pump Industry Co., Ltd. test center is the only high-pressure pump test station in Hunan authorized by the quality supervision and inspection of hydraulic machinery in Hunan Province, and the only national secondary high-pressure pump test platform in Hunan. The maximum test pressure of our test center can reach 25MPa, the maximum test flow is up to 16000m³/h, the maximum diameter is 1400mm, the supporting power supply is 10KV/6KV/380V, and the maximum supporting motor power can reach 5000KW. Large test pipelines above DN500 are 1400mm, 900mm, 500mm, maximum lifting capacity 20T, rail height 12m. Among them, 8 meters wet pit and 5.5 meters dry pit are prepared with various interfaces to meet the pump installation test operation under the conditions of inverted irrigation. And the test requirements of low-lift axial flow pumps. At the same time, the test station also prepares imported resistance adjustment devices, which can test the cavitation of large pumps.       The pump model used in this simulation experiment is: DKS3600-125*3, the flow rate is as high as 3600m³/h, the head is nearly 400 meters, and the frequency conversion motor power is 5000KW. There is only one manufacturer in Hunan that owns this large flow and high lift pump and test site. The professors spoke highly of our products and services.           The test center adopts a fully automatic host computer measurement and control system, and is equipped with 5 field probes, which can monitor the entire test center in an all-round way. It uses high-precision testing instruments and meters. Sensors and computers are combined to automatically collect, process, and analyze power parameters and fluid parameters. The test results can be automatically displayed, printed tabulations, and drawn characteristic curves. The data of the central control room and the reception room can be synchronized to run and display, and can be remotely synchronized to run witnesses with authorization. We are committed to meeting customer needs and solving customer problems. We respect professional technology, quality responsibility, performance orientation, teamwork, and abide by our promises, and we are dedicated to becoming an international leader with excellent quality and good service. The choice of professors from major universities and Anhui Redstar Valve Co., Ltd. to do simulation experiments in our company is a high recognition of the Canon pump industry. We will also provide advanced technology, first-class products and high-quality services to provide customers with any needs help. is willing to sincerely cooperate with domestic and foreign customers to create a grand blueprint together!
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