1 and improvement of rubber ball cleaning device of 25MW unit: 1993, two rubber ball cleaning devices of 25MW unit in Donghai Power Plant were transformed from mobile to fixed, which solved the problem that the original rubber ball cleaning device could not be put into normal operation and the condenser needed to be cleaned manually. After the reform, the rubber ball system received 100%. This project won the second prize of scientific and technological achievements of Yimin Coal and Electricity Company 1993. I played an important role in this transformation.
2. Use the waste heat of circulating water to replenish water for boilers and heating networks: 1996 The waste heat utilization of circulating water for 25MW units was reformed, and the circulating water of the units was transported to the chemical water treatment room to be treated as the supplementary water for boilers and heating networks; Make full use of the waste heat of circulating water. After the transformation, the raw water heater was cancelled, and the economy of the unit was improved. I played an important role in this transformation, and this project won the third prize of scientific and technological achievements of 1996 Yimin Coal and Electricity Company. 1999 My paper "Utilization of Waste Heat of Circulating Water and Energy-saving Effect" was rated as the first-class paper in the editorial department of Energy-saving Technology, and it was the most comprehensive reference writing website for the model essay of Heilongjiang Energy Research Association.
3. Solve the problems of # 1 unit speed regulation system instability and load swing: # 1 unit speed regulation system instability and large load swing seriously threaten the safe operation of the unit. Through professional research, analysis and test, it is determined that the position of the oil drain hole of the throttle piston on the emergency trip throttle deviates from the design position, which hinders the oil drain, so that the oil leaked from the clearance of the slide valve in the protection oil circuit cannot be discharged in time, enters the quick-closing oil circuit, and pushes the throttle wrong, which makes the speed control system unable to adjust and swing normally. The improvement measures are: re-drilling the throttle piston to make the oil discharge smooth and eliminate the system swing, and the improved speed control system works normally. This project won the fourth prize of scientific and technological achievements of Yimin Coal and Electricity Company 1996.
4. Presided over the reconstruction of the drainage device of the continuous blowdown flash tank of the 25MW unit boiler: the manufacturer of the steam trap of the continuous blowdown flash tank of the boiler is designed as a bucket floating steam trap. The device is not closed tightly and the internal leakage is serious. During operation, the continuous blowdown flash tank runs without water level, and the steam in the boiler continuous blowdown flash tank is wasted. Therefore, the steam trap is changed into a hydraulic water seal hydrophobic device. After transformation, the water level of the continuous blowdown flash tank is stable, without maintenance, the steam is recovered and the heat loss is reduced. This project won the fourth prize of scientific and technological achievements of Yimin Coal and Electricity Company 1996.
5. Be responsible for energy-saving transformation of PYS- 140 deaerator and make-up water system of # 1 and # 65438+2 units: # 1 and # 2 deaerator are spray disc type atmospheric deaerator, with serious exhaust water in operation. The drainage pump is difficult to pump water, and the drainage tank overflows. 1997 presided over the reconstruction of # 1 2 deaerator and water supply system, with specific measures as follows:
(1) Cover the deaerator head with a water retaining device, and install a throttle hole on the deaerator pipeline.
(2) Separate the hydrophobic water entering the deaerator from the condensed water, and the hydrophobic water enters the deaerator separately through the nozzle. After the transformation, the deaerator eliminated the phenomenon of exhaust steam carrying water. The lack of water in the drain tank reduces the heat loss, and the rapid intermittent operation of the drain pump reduces the auxiliary power consumption. This project won the third prize of scientific and technological achievements of Yimin Coal and Electricity Company 1996. I wrote "PYS- 140 Energy-saving Reconstruction of Deaerator and Make-up Water System", which was published in the second issue of Energy-saving Magazine 200 1.
6. Renovation design of water supply for in-plant heating network system: The water supply tank of in-plant heating network system is designed on the 25m floor of the main building, and the water supply valve is manually adjusted.
1. Due to the high static pressure at the inlet of circulating pump in heating network, the water supply pressure of heating network is higher than the working pressure of radiator, so the radiator often cracks.
2. Because the circulating water and domestic hot water in our plant are the same system, the consumption of domestic hot water is not constant, sometimes it is large and sometimes it is small. It is not timely to manually adjust the water supply of heating network, and the water supply tank of heating network often overflows. 1999, the water supply system of heating network in the factory area was reformed. The improvement scheme is to change the water supply tank of heating network into the roof of heating station of heating network, and install a floating water supply regulating valve in the water supply tank. After the transformation, the water supply pressure of heating network is stably controlled within 0.4MPa, and the water supply regulating valve automatically adjusts the water quantity according to the water consumption. This equipment is maintenance-free
7. Modifying the design of auxiliary cooling water system in the low vacuum reconstruction of # 1 and # 2 units: In the low vacuum circulating water heating reconstruction of #1and # 2 units in 2006, it was proposed that the design of auxiliary cooling water system was unreasonable, and the negative pressure suction at the inlet of auxiliary cooling water pump was changed to positive pressure water intake, and the anti-freezing of cooling tower heating equipment was changed to auxiliary cooling water anti-freezing. The operation reliability of auxiliary cooling water system is improved, and the anti-freezing problem of tower basin and water inlet pipeline after the water tower stops in winter is solved.
8. Reconstruction of condensate pump inlet pipeline of #3 and # 4 units: the inlet pipeline of condensate pump of # 3 and # 4 units is designed as 159×4 and 5 pipeline. The design of its pipe diameter is too small, and the condensed water of the unit cannot be discharged in time. During the trial installation of the unit, the inlet pipeline of the condensate pump was reformed, and the inlet pipeline of the pump was changed to 2 19×6 pipeline, and the defects were eliminated after the reform.
9. Anti-freezing design of pressure pipes of #3 and # 4 water towers: 65,438+0 water towers are shut down during the pumping operation of # 3 and # 4 units in winter, and the anti-freezing problem of water supply pipes of water towers shut down in winter is not considered in this system design. During the installation of the unit, anti-freezing valves were installed in the water inlet pipes of #3 and # 4 water towers, which solved the anti-freezing problem of the water inlet pipes of water towers in winter.
10, presided over the reconstruction of the steam exhaust system of the front gland of #3 and # 4 units: the steam exhaust of the front gland of #3 and # 4 units in our factory is designed as three-stage exhaust, and the first (near the cylinder), second and third-stage exhaust are discharged to the second, third and fifth stage extraction respectively.
The problems existing in this design are that the steam leakage of the front gland is not smooth, and the steam leakage of the gland leaks into the front bearing box, which makes the oil contain water, and the exhaust pipe is not equipped with a valve, so the exhaust volume of the gland cannot be adjusted. In 2006, the exhaust system of the front gland of #3 and # 4 units was reformed: the first, second and third exhaust of the front gland was changed to the next extraction (fourth, fifth and sixth extraction), and valves were installed on each exhaust pipeline for adjustment. After the transformation, the front steam seal exhausts smoothly, reducing the leakage of steam and solving the problem of water in oil.
1 1, #3 and # 4 units' feedwater recirculation system reconstruction design: the feedwater recirculation system of #3 and # 4 units is designed as 159×4 main pipe and 133×4 branch pipe, and the TOP 100 type recirculation main pipe connecting door and branch pipe valve. 5MPa valve, recirculation main lack of contact door. When the feed water recirculation system fails, the valve of the system cannot be closed, and it can only be repaired if the two units stop completely. In 2007, the feedwater recirculation system of #3 and # 4 units was reformed by taking advantage of the complete shutdown of the units. The feed water recirculation pipeline was changed to 133× 12 pipeline, and the connecting door and branch door of the main pipe were changed to 25MPa valves, and the number of connecting doors was increased on the main pipe of feed water pump recirculation. The safety and reliability of the water supply recirculation system are improved.
12, presided over the energy-saving transformation of the water supply system of # 1 2 heating network: in 2007, presided over the transformation of the water supply system of # 1 2 heating network, supplemented the circulating water of 50MW units to the # 1 2 heating network system, and recovered the residual heat of the circulating water. Writing "Energy-saving transformation of heating network water supply system in a power plant" and publishing it in the ninth issue of Energy-saving Magazine (20 13).
13, # 3 and # 4 units: after two 50MW units were put into production, there was a defect that the main steam drainage system could not be shut down during troubleshooting, which seriously affected the normal operation of the units. In 2009, the main steam drainage system of two units was reformed, and the main steam drainage system was changed to a single unit independent drainage system. The improved drainage system runs reliably. The renovation project won the "Rationalization Suggestions" and "Five Small" Competition Award in 2009 in Donghaier Power Plant.
14, #3 and # 4 exciter cooling water interface transformation: the design interface of #3 and # 4 exciter cooling water cannot meet the requirements due to the height difference behind the cooling water gate of generator air cooler. Therefore, in 2009, when the unit was overhauled, the system was reformed, and the exciter cooling water interface was changed to the outlet main pipe of the circulating pump. After transformation, the exciter has sufficient cooling water and reliable operation.
15, #3 and # 4 pump inlet pipeline transformation: the inlet pipeline of #3 and # 4 pump is designed as 2 19×6 pipeline. The disadvantage of this design is that the diameter of the inlet pipe of the pump is too small, and the vibration of the pump exceeds the standard, which can not ensure the safe operation of the pump. During the overhaul of 20 10 unit, the pump inlet pipeline was transformed into 377×6 pipeline. After the transformation, the operating environment of the pump is improved, the vibration is eliminated, and the safety and reliability of the pump operation are improved.
16. Participate in the diagnosis and treatment of bearing vibration of #3 generator set: After the production of #3 generator set (50MW) in our factory, the vibration of generator bearing seat exceeded the standard for many times, but it was not completely solved in the following two overhauls and several minor repairs. After general operation for half a year, the vibration of the generator will gradually rise beyond the standard. Aiming at the vibration problem of #3 generator bearing, after careful analysis and research, the treatment measures are formulated. The specific scheme is:
1. Replace No.3 and No.4 bearing housings with reinforced bearing housings.
2. Dismantle the bedplate and pad irons, rearrange the pad irons, and add 6 pairs of pad irons (10 pair of pad irons before repair and 16 pair of pad irons after repair) to the No.3 and No.4 bearing seats respectively, and carry out secondary foundation grouting. The rotor shafting performs high-speed dynamic balance to reduce the bearing amplitude to an acceptable range. After overhaul, the amplitude of the rear bearing of the generator of the unit is reduced to below 50μm, and the axial amplitude of the front bearing is reduced to about 60μm, so the unit can run for a long time. I play an important role in this work. The paper "Diagnosis and Treatment of Vibration Fault of 50MW Turbine Generator Set" was written and published in the 6th issue of Turbine Technology (20 13).
17 and #2 backwater pump station outlet valve hoisting facilities design: 20 1 1 # 2 backwater pump station replaced four backwater booster pump inlet and outlet valves with electric butterfly valves, and the electric gate valve at the pump outlet was installed at 3m elevation, with its own weight 1260kg (960kg gate valve, 300kg electric installation). Because the pumping station is not designed with lifting facilities for the backwater booster pump and the inlet and outlet doors of the pump, it is necessary to make hanging beams for installing the pump and the inlet and outlet doors. At the top of #2 backwater booster pump house, a hanging beam (22b I-beam, length 25. 5m, with its own weight of 928kg), the hanging beam is fixed at the lower part of six guide beams, which are made of 30a channel steel (single beam is 4m long and weighs 160kg), the south side is welded and fixed on the original motor hanging beam, and the north side is welded with embedded iron (the embedded iron is 400×400× 12 steel plates, and four pieces of 65438 are welded. The lifting facility has completed the lifting task of replacing the inlet and outlet valves of the booster pump of #2 backwater pump station, and can also lift the pump cover and rotor when the backwater booster pump is overhauled. For details, please refer to the strength check of the hanging beam at the outlet of the booster pump of #2 backwater pump station and the construction drawing of the hanging beam at the outlet of the booster pump of #2 backwater pump station. This renovation project won the first prize of "Rationalization Suggestions and" Five Small "Competition Award" in 201year of East Hailaer Power Plant.
18, transformation of the connection between the industrial water of 25MW unit and the industrial water pipeline of 50MW unit: in the design of the industrial water system of 50MW unit, the connection with the industrial water system of 25MW unit is not considered, and there is no auxiliary cooling water source when the industrial water system of 50MW unit fails. Therefore, during the overhaul of 20 12 unit, the industrial water of 25MW unit is connected with the industrial water of 50MW unit. After the transformation, the system is flexible and can be used as a backup, which improves the reliability of the system.
19, #2 heating network circulating pump impeller turning to solve the problem of small opening of the outlet door of the heating network circulating pump: the diameter of four circulating pump impellers in #2 heating network is 595mm, and the pump outlet door (DN500 gate valve) can only be opened 60mm in operation (at this time, the motor current is 46A). When the opening is greater than 60mm, the motor current exceeds the standard (rated current 48A), and the pump shaft power is greater than the design value. 20 13 years #2 heating network # 1 and the impeller diameter of three circulating pumps were rotated by 20mm (from 595mm to 575mm) and the impeller static balance test was carried out. After turning, the outlet door of the water pump can be fully opened, the current is 42A (4A is lower than before turning), and the water supply pressure and flow rate do not drop. In this case, the water pump can run for a long time. The problem of small opening of outlet valve of circulating pump in #2 heating network is solved. After the impellers of two circulating pumps in the heating network rotate, the shaft power of the water pump is reduced by 59kw, and the auxiliary power is saved by 659,856 kW in each heating period, and the on-grid electricity price is zero. 326 yuan/kwh, annual profit 2 1. 50 thousand yuan.
20.20 13 September, the reform scheme of circulating water heating for #3 unit in low vacuum operation was formulated, and the cooling water system of auxiliary engine was designed: the project was completed and put into operation in 20 13 10/2. Achieve the purpose of energy saving and economic operation. Be responsible for compiling the scheme of circulating water heating for low vacuum operation of Unit #3, designing the cooling water system of auxiliary engine, guiding the installation and solving the problems existing in the installation. Write a paper "Feasibility of Low Vacuum Circulating Water Heating for 50MW Units in the Early and Late Period of Heating", which was published in the No.1 12 issue of Energy Conservation magazine.