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Application of Low Pressure Steam Turbine in Feed Water Pump of Heating
Fujian Refining & Chemical Co., Ltd. 3 sets of heating boiler feed pump original design using Taiwan motor drive, the maximum power of 450kW "In the company steam balance, due to excess steam at 0145MPa (gauge pressure), the use of / cogeneration 0 mode, the new A steam turbine instead of a motor-driven feed pump, not only to meet the boiler feed water needs, but also save energy and improve economic efficiency.A steam turbine-driven feed pump work system heating system in the normal operation of the boiler, you must Its water supply for oxygen and oxygen removal steam are taken from the turbine exhaust or steam balance pipe network, which will make a lot of high-pressure steam throttling device into low-pressure steam, resulting in a great waste, reducing the overall thermal efficiency " The principle of co-generation energy-saving technology, the use of low-power single-stage back pressure steam turbine to replace the pump motor, reducing refinery electricity, reduce overall energy consumption. "Company heating boiler 1 #! 2 # deaerator has been using 0145MPa Steam desalination demineralized water heating and deoxygenation, steam consumption of about 11tPh "0145MPa steam mainly from the catalytic pressure machine back pressure steam pipe" pressure 0145MPa! Degrees 210e overheated steam down to 0105MPa! 150e, and then sent to the deaerator from the water treatment section of the demineralized water heated deoxygenated condensed into 104e deaerated water, the steam consumption is only more than the original 017tPh, but with The heat energy of 0145MPa steam "This energy conversion is completed in the low-pressure steam turbine, the thermodynamic system shown in Figure 1. Figure 1 Second, the application of steam turbine-driven feed water heating system Three boilers using DG85 medium pressure feed pump and two sets of low-pressure feed pump, DG85 feed pump flow 85m3Ph, head 598m, run 2, standby 1 Taiwan "In 1997 the boiler added a 10 # to the pump, the flow rate of 150m3Ph, head 598m, supporting motor power 440kW" under normal circumstances, the operation of 10 # to the pump, 3 pumps for standby "open on off, run 1 Taiwan 85m3Ph feed pump "In order to meet the requirements of boiler deaerator water, steam-driven feed pump design flow of 200m3Ph, lift of 600m, feed pump material 1Cr13Ni stainless steel, to overcome the feed pump cavitation phenomenon; the pump mechanical seal to overcome Filler seals often leak phenomenon to ensure long-term operation "Low-pressure steam turbine selection Hangzhou Steam Turbine Power Group production B72L series B0.5-5.5P1.5 single-stage back pressure turbine" rated power 500kW, speed 3000rPmin, speed range 2400 ~ 3180rPmin, inlet pressure of 0155MPa (absolutely), exhaust pressure of 0115MPa, inlet temperature 180 ~ 200e, exhaust temperature 160e, steam consumption 28177kgP (kW # h). The turbine adopts a single-layer layout and shares a base with the feed pump to reduce the installation space. Both the turbine and the feed pump adopt oil-throw lubrication. The turbine thermal expansion compensation adopts the elastic support of the front bearing. The pump and turbine are connected by a metal stack Flexible couplings; speed control system using the United States WOODWardTG13 governor, mechanical flying hammer speeding protection. Third, the application effect The steam turbine driven by the pump after installation and commissioning, the pump flow control 160m3Ph, pressure 610MPa, steam consumption 915tPh "due to 0145MPa steam pressure and temperature fluctuations directly affect the steam turbine speed, resulting in pump flow And pressure fluctuations "speed control range of 2800 ~ 2920rPmin, the pump can run smoothly" By the same water load comparison, the use of steam turbine-driven pumps to meet the production needs, electricity price of 015 yuan P (kW # h) dollars , If the pump safe operation 8000h, a total of 1.6 million yuan energy saving costs, one year to recover the investment, energy-saving significant benefits. IV Conclusion 1, the use of single-stage low-pressure steam turbine-driven boiler feed pump / Produce 0 ways, can improve the economic benefits of thermal power enterprises. 2, the boiler feed pump motor drive and turbine drive each other, can improve the reliability of the boiler safe operation. 3, low pressure steam turbine driven feed pump, the installation is simple Adaptable, energy-saving effect is remarkable.