Retrofit and operation of air compressor turbines Ma Jun is busy with Shaanxi Weihe Coal Chemical Group Co., Ltd., Weinan, Shaanxi. The load of 714000 group is significantly improved, and the air compressor gas is set to 142000 during high temperature operation in summer, ensuring the high load production of the device.
1Overview of the air separation unit installed in the methanol plant After the air compressor unit is installed and commissioned, it will be operated at a low load of 7580 for a long period of time. The main reason is that the drive steam turbine of the air compressor unit has the bearing main thrust tile temperature and high steam seal leakage. Large, causing the unit speed to rise, affecting the air intake of the air compressor. The steam turbine inlet steam parameter is 10.0 touch 520 ft, the front end bearing is the joint bearing design; the front steam seal is designed as the original spring piece on the back of the comb-shaped steam seal, and later changed to spring, there are 7 sets of steam seals, after the first 3 sets of steam After the sealing, the leaking steam enters the 4.0-extracted steam pipe network, and the rest is passed through the two sets of steam seals as the shaft-sealed steam on the exhaust side. When it was overhauled in May 2007, it was found that the comb seal was deflected and the gap between the rotor and the rotor was too large, and there was crack on the steam seal and the spring elasticity of the seal spring was lowered.
And the design paper for analysis and confirmation, from two aspects to solve the problem of the existence of the air compressor turbine 1 use the device overhaul opportunity to solve the air compressor steam turbine itself, the bearing temperature, high steam seal, large air leakage, do not ask, improve the optimization The operation of the press booster unit.
22007 Technical changes in steam turbine overhaul 2.1 The thrust of the thrust bearing main thrust tile is high. The method of increasing the oil supply of the main thrust dam is adopted. At the same time, special thrust bearings and diameters are designed considering the thrust and radial bearing oil supply modes. In the actual situation that the bearing oil supply quantity is greatly affected by each other, the following specific measures are taken according to the actual calculation to expand the two oil supply holes of the thrust bearing main thrust tile from the ring 16 by at least 16.5 to increase the main push tile oil supply.
The two oil supply holes of the thrust bearing auxiliary thrust tile are reduced from the small 15 to the life 14,1 to indirectly increase the oil supply amount of the main push tile.
According to the area change of the main thrust dam after reaming, the corresponding 2.2 steam seal leakage can not be solved according to the air compressor. After the disassembly of the air compressor overhaul, the steam seal spring is seriously invalid. The front end of the steam turbine has two stages of steam seal due to the bearing shaft. To the excessive pressure difference is a mouth-like and long cracks and other actual phenomena, take the following measures to replace the steam seal spring, the spring material is 1 such as, 1718.
Received date 20091015; received revised date 20100512.
He is a major in fluid mechanics at Xi'an Jiaotong University. He has long been engaged in technical transformation of large fertilizer and methanol plant equipment technology and fault diagnosis of rotating machinery. Contact all the steam seal opening pressure holes between the front end of the steam turbine and the high and medium pressure sections, and lead the steam to the steam seal spring side to compensate for the pressure on the side of the steam seal spring. From the end face of the steam seal facing the direction of steam leakage, first open the gaps of the apricots 3, 1 and 2 perpendicular to each other, and move the front seat of the steam turbine to the east by 0.40 mm to ensure that the turbine rotor and cylinder concentricity are satisfied. It is required to reduce the excessive gap between the steam seals on both sides of the east and west.
Check the restrictor orifice plate on the steam seal line to clean the blockage and ensure that the pipeline is drained when driving.
2.3 Other maintenance contents According to the actual situation that the lower part of the tile has slight defects after the front radial bearing is disassembled, the side tile and the tile are interchanged, and the platinum resistance temperature measurement is pre-opened on the tile. hole.
Increase the flow rate of the turbine condensate pump outlet, and replace the air compressor inlet guide vane actuator. 2.4 Optimize the operation of the air compressor booster unit after driving to reduce the air venting of the air compressor outlet anti-surge valve and the air return flow of the booster anti-surge valve.
According to the effect of steam seal technical modification, the steam extraction amount of the air compressor is appropriately increased to reduce the amount of condensate to reduce the temperature of the turbine thrust bearing.
3 large repair unit operation effect
It can be seen from 1 that the steam consumption of the unit after the technical transformation is significantly reduced. The main steam intake of the steam turbine with the air volume of the air compressor at 1000000000 is 190.0194.2 讥, the condensing volume is 8286 讥, and the thrust bearing temperature is The apparent decrease was originally 45.5 ft, and the air volume delivered to the subsequent device by the air compressor was now increased to 142,000, a load of 95 and 95. The actual operation results show that the boiler with 22,1 steam can meet the operation requirements of the air compressor unit 100 load, and if the front radial bearing temperature can be continuously reduced, the speed can be increased, so that the air volume can continue to increase.
Exhaust steam side shaft vibration 01 shaft displacement mm inlet side bearing temperature 弋 exhaust steam side bearing temperature 弋 thrust bearing temperature main and auxiliary thrust watts 4 pairs to solve the high temperature of the front radial bearing of the steam turbine thinking of the front radial bearing temperature of the turbine High is related to load changes. The radial bearing temperature is related to the oil temperature and the load on the radial bearing, which is no exception to the turbine front radial bearing temperature. The radial load experienced by the front radial bearing is the vector sum of the radial force generated by the nozzle from the steam flow to the rotor and the rotor weight. The temperature of the front radial bearing of the steam turbine is sensitive to the change of steam inlet steam load and the change of the rotational speed of the steam turbine. This fully demonstrates that the radial flow of the steam flow from the nozzle to the rotor can not be ignored. The means to eliminate or reduce the radial force is to change the position of the governing valve head, because the different nozzle inlet sequence has a great influence on the radial force 3 and 4.
In 4, the solid line is the radial force generated by the steam flow when the valve heads are sequentially opened and the rotation speed is increased in the steam inlet sequence of the original nozzle when the vehicle is driving, and the nozzles are sequentially opened after the dashed line is replaced by the No. 2 and No. 3 valve heads. The radial force generated by steam flow. It can be seen that the direction of the radial force acting on the rotor after the valve head is changed is changed, and the direction is upward, so that the combined force of the radial force generated by the steam flow on the radial bearing and the gravity of the rotor is reduced. It is beneficial to reduce the temperature of the front radial bearing. In fact, high-power steam turbine generator sets in the power generation industry have precedents that have successfully reduced the temperature of the front radial bearings.
Johnson Matthey is a multinational specialty chemicals company. The company focuses on developing its core technologies in the field of catalyst precious metals and fine chemicals. Ammonia synthesis catalysts account for more than 35 market shares in the rest of the world except China. Since the company's ammonia synthesis catalyst entered the Chinese market, it has been favored by domestic enterprises. A number of synthetic ammonia production enterprises in Henan, Inner Mongolia, Qinghai, Hainan and other provinces have signed purchase intentions with the company.
Henan Coal Industry Chemical Group Zhongyuan Dahua Co., Ltd. sets a daily production of 1000 1 ammonia plant. Since the car was started in May 1990, the first furnace has been run by the current British Johnson Matthey, and the 1 Ding 741 catalyst has been operated. 203, created a world record for the life of ammonia synthesis catalysts. The device was designed by the German Wood Engineering Company and used the original 5 company's ammonia synthesis process technology.
In the first half of 2009, the recent data of the Zhongyuan Dahua plant were analyzed, and the results showed that the activity of the catalyst was still very good.
The pure oxygen conversion technology developed by Johnson Matthey Company won the bid for the methanol production project of Hebei Cangzhou Zhongtie 28 coke oven gas in late May 2010. The project will be completed and put into operation in the second half of the year. Previously, the technology has been applied in Lanzhou Blue Star Chemical Co., Ltd. 2 basket 1; 1 natural gas methanol Harbin Coal Chemical Co., Ltd. 0.25 station 13 coal methanol plant and Anhui Huaibei Linyi Coking Co., Ltd. 2 elbow coke oven gas methanol plant . Compared with the traditional pure oxygen conversion technology, Johnson Matthey's new technology adopts the oxygen self-cooling process, which does not require jacket water cooling, and the burner has a longer operating life. At the same time, the catalyst loading amount of this technology is only half of the domestic catalyst dosage, which reduces the size of the reformer and greatly reduces the investment cost. In addition, the technology also uses a unique distributor to ensure uniform mixing of oxygen and process gas, high combustion efficiency, low oxygen preheating temperature, 1000 times lower than the preheating temperature of ordinary pure oxygen conversion technology, reducing equipment investment and energy consumption. The company's pure oxygen conversion technology is also equipped with a complete control and 50 electrostatic discharge system, safe and guilty bureau, simple control. In coke oven gas methanol, Johnson Matthey technology only needs to be ignited above 450, which greatly reduces the requirements for the material of the feed gas furnace. The ignition success rate is from 1 to oxygen and from observation to exit temperature. l only 361.
Johnson Matthey of the United Kingdom accelerates investment in China's synthetic ammonia and methanol industry, Shanghai Qingdu Jinqiu Energy Petrochemical Studio Qian Bozhang
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