A steam turbine high back pressure heating system and its auxiliary system
A technology for auxiliary systems and heating systems, applied in steam engine installations, mechanical equipment, steam applications, etc., can solve the problem of mismatch between auxiliary systems and main engine systems, and achieve the effect of increasing flexibility, reducing tube bundle stress, and ensuring safe operation.
Active Publication Date: 2022-05-03
SHAANXI WEIHE POWER GENERATION CO LTD +1
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Problems solved by technology
[0004] The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art, and provide a steam turbine high back pressure heating system and its auxiliary system to solve the problem that the current steam turbine unit auxiliary system does not match the main engine system
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Embodiment 1
[0041] Tested according to the embodiment of the present invention, taking a certain 4×300MW subcritical condensing unit as an example, about 300 tons / hour of steam was discharged into the condenser before the unit underwent double-rotor interchange and high back pressure heating transformation of the unit , leading to insufficient heating capacity, the heating capacity of the 300MW unit is only about 200MW; after the transformation, the high back pressure and low pressure rotors are used during the heating period, the back pressure of the steam turbine is increased to 54kPa, and the maximum exhaust temperature is 83.3 ℃. In order to solve the problem of mismatching auxiliary systems caused by high back pressure exhaust parameter changes, measures were taken to replace high-strength materials for condenser stress changes; a high-pressure steam source (3.462MPa, 312.9℃ ), after the high-pressure steam source is depressurized by the pipeline regulating valve, it is used as a supp...
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The invention discloses a steam turbine high back pressure heating system and its auxiliary system, comprising: the front water chamber and the rear water chamber of the condenser are steel plates with a thickness of 15 mm to 20 mm, and the yield strength of the steel plates ranges from 235 MPa to 345 MPa; The tube plate is a stainless steel composite plate; expansion joints are set at the joint between the throat of the condenser and the exhaust steam pipe of the low-pressure cylinder; the auxiliary system of the shaft seal cooler includes: shaft seal cooler in the heating season and shaft seal cooler in the non-heating season; In season, the steam extracted by the steam turbine enters the feedwater pump turbine through the original steam extraction pipeline, and enters the condenser through the exhaust pipeline. The supplementary steam extraction pipeline added to the feedwater pump turbine is connected with the high-pressure supplementary steam source; , The desuperheating water is low-temperature condensed water at 38°C to 42°C. The auxiliary system of the invention can be matched with the host system of the high back pressure heating system, can ensure the safe and stable operation of the steam turbine unit in the heating season, and can maximize the thermal economy.
Description
technical field [0001] The invention belongs to the technical field of steam turbine high back pressure heat supply, in particular to a steam turbine high back pressure heat supply system and its auxiliary system. Background technique [0002] With the maturity and development of high back pressure heating transformation technology, more and more power plants in China have carried out high back pressure heating transformation on units to expand the heating area of units and improve thermal economy. When the unit is in the heating season, by increasing the operating back pressure to 40-50kPa and increasing the exhaust temperature of the low-pressure cylinder to 80-90°C, the return water of the heating network is heated once, and the heated return water of the heating network passes through the heating network heater for the second time After the first heating, the domestic and industrial heating will be carried out. [0003] In the high back pressure heating system of the ...
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IPC IPC(8): F01K11/02F01K17/02F01D25/12
Inventor 李志高宋宏林谭厚章吕钊敏
Owner SHAANXI WEIHE POWER GENERATION CO LTD