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-driven, the maximum power of 450kW "In the company steam balance, due to excess steam at 0145MPa (gauge pressure), the use of / 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.

First, the steam turbine-driven feed pump work system Heating system boiler in normal operation, its water supply must be oxygen scavenged oxygen are taken from the steam turbine exhaust steam or steam balance pipe network, which will make a lot of high-pressure steam through Throttling device into low-pressure steam, resulting in a tremendous waste, reducing the overall thermal efficiency "According to the principle of thermal power co-generation energy-saving technology, the use of low-power single-stage back pressure turbine to replace the pump motor, reducing the refinery electricity , Reduce overall energy consumption. "

Company heating boiler 1 #! 2 # deaerator has been using 0145MPa steam decompression of desalinated water heating and deaeration, steam consumption of about 11tPh "0145MPa steam mainly from catalytic pressure machine back pressure steam pipe network" pressure of 0145MPa! Temperature 210e superheated steam down to 0105MPa! 150e, and then sent to the deaerator from the water treatment section of desalted water heated deoxygenated coagulation into 104e deaerated water, the steam consumption is only more than the original 017tPh, but it used 0145MPa steam thermal energy "This energy conversion in the low-pressure steam turbine to complete its thermal cycling system shown in Figure 1.

figure 1

Second, the steam turbine-driven feed pump heating system 3 boilers using three DG85 pressure feed pump and two low-pressure feed pump, DG85 feed pump flow of 85m3Ph, head 598m, run 2, spare 1 " In 1997, a 10 # feed pump was added to the boiler with a flow rate of 150m3Ph and a lift of 598m. The motor power was 440kW. Under normal conditions, a 10 # feedwater pump was run and three pumps were on standby. During operation, one 85m3Ph Feed pump "In order to meet the deaerator requirements of the boiler, steam-driven feed pump design flow of 200m3Ph, head to 600m, feed pump material 1Cr13Ni stainless steel to overcome the cavitation of the feed pump; the pump uses a mechanical seal to overcome the packing seal Often leak phenomenon to ensure long-term operation "Low-pressure steam turbine selection Hangzhou Steam Turbine Power Group B72L series B0.5-5.5P1.5 single-stage back pressure steam 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 energy-saving fee, one year to recover the investment, significant energy-saving and efficiency.

Fourth, the conclusion
1, the use of single-stage back pressure low-power steam turbine-driven boiler feed pump / CHP 0 mode, can improve the economic efficiency 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, easy installation, adaptability, energy-saving effect is remarkable.

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