Two-stage backpressure machine reheating steam extraction heating supply system and method

Abstract

The invention discloses a two-stage backpressure machine reheating steam extraction heating supply system and method. The two-stage backpressure machine reheating steam extraction heating supply system comprises a deaerator water inlet pipe, a deaerator, a boiler water inlet pipe, a boiler water outlet pipe, a high-pressure backpressure machine and a high-pressure steam supply pipe. A boiler is arranged on the boiler water inlet pipe. The high-pressure steam supply pipe communicates with a low-pressure steam inlet pipe. The low-pressure steam inlet pipe communicates with a low-pressure backpressure machine. The low-pressure backpressure machine communicates with a low-pressure steam supply pipe. The two-stage backpressure machine reheating steam extraction heating supply system has the beneficial effects that the requirement of users for high-parameter steam is met through unit reheating; the power capability of reheated steam is greatly improved; waste steam generated from acting by the low-pressure backpressure machine is supplied to low-pressure heat users; the requirements of the users for high-pressure steam supply and low-pressure steam supply are both met; and the utilization efficiency of heat energy is improved.

Description

technical field [0001] The invention relates to the technical field of back pressure machines, in particular to a two-stage back pressure machine reheat extraction steam heating system and method. Background technique [0002] The "General Office of the State Council on Printing and Distributing the Energy Development Strategic Action Plan" (2014-2020) (Guo Ban [2014] No. 31) requires: fully implement the energy strategic policy of "conservation, cleanness and safety", implement stricter energy efficiency and environmental protection standards, and accelerate The upgrading and transformation of coal-fired power generation will create an upgraded version of the coal power industry with high efficiency, cleanliness and sustainable development, laying a solid foundation for national energy development and strategic security. According to the relevant national industrial policies and in accordance with the principle of "determining electricity by heat", for areas with sufficient...

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Problems solved by technology

[0004] 1) The direct heat supply of small boilers is reliable and stable, but the combustion efficiency of small boilers is low, the economy is poor, the emission is difficult to meet the standards, the pressure on environmental protection is huge, and it is facing elimination, and it cannot provide electricity and has a single function

[0005] 2) The heat supply of the back pressure steam turbine is reliable and stable, but the steam mainly comes from a small boiler, which also has low combustion efficiency, and the emission is difficult to meet the environmental protection pressure. The flow efficiency of the steam turbine is also low, and the economy is very poor

[0006] 3) The adjustment of the high-pressure seat cylinder valve can realize the high-pressure adjustable heat supply of the steam turbine unit. The seat cylinder valve is set in the high-pressure flow of the unit for adjustment, and the pressure response is sensitive; The inner cylinder needs to be divided into two sections, and steam introduction and extraction devices are added, and the seat cylinder valve has a new design. The upper half of the high-pressure outer cylinder needs to install the seat cylinder valve and bear its dynamic load. It is difficult to guarantee the rigidity of the cylinder, and the design is difficult and the cycle is long;

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