Thermoelectric decoupling heating system extracting steam from utility boiler

Abstract

The invention discloses a thermoelectric decoupling heating system extracting steam from a utility boiler. A steam condensing heat exchanger is mainly adopted for heating return water of a heating network, a steam extraction heater is then additionally arranged behind the steam condensing heat exchanger, and heat source steam of the steam extraction heater is extracted from an overheating section or a reheating section of the utility boiler. When a turbine power generation system is under the high load, exhaust steam of a turbine or steam extracted from a medium-pressure cylinder and low-pressure cylinder communicating pipe of the turbine is completely adopted to be condensed in the steam condensing heat exchanger to release heat to heat the water of the heating network, when the load of the turbine power generation system is reduced and the heating capability of the steam condensing heat exchanger is insufficient, high-pressure steam is extracted from the utility boiler, subjected to pressure reduction and sent to the steam extraction heater, the water of the heating network is further heated, and therefore it is ensured that the heating capability is not reduced under the low power generation load. According to the thermoelectric decoupling heating system extracting the steam from the utility boiler, thermoelectric decoupling of a heating power plant can be achieved, it is ensured that the heating capability under the low power generation load is not reduced, in addition, decreasing of the temperature of tail smoke of the utility boiler under the low load can be relieved, and it is ensured that a boiler denitration system works normally.

Description

technical field [0001] The invention belongs to the technical field of coal-fired power generation combined heat and power, and relates to a thermoelectric decoupling heat supply system that extracts steam from a power station boiler. Background technique [0002] With the in-depth development of my country's energy conservation and emission reduction work, many coal-fired power plants have been transformed into combined heat and power plants that can provide heat for surrounding residents in winter in some areas of our country, especially in northern areas where conditions permit. The advantage of combined heat and power generation is that it can use high-quality steam to generate electricity while providing heating heat for surrounding residential areas, avoiding the loss of the cold end of the thermal power generation system, and greatly improving energy utilization. At the same time, the power plant can charge heating fees. Improve power plant efficiency. [0003] Howev...

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Problems solved by technology

[0006] In order to solve the problem that the heat supply power plant operates in a heat-fixed power mode, and the unit has low flexibility and cannot undertake the peak-shaving task, the present invention proposes a thermoelectric decoupling heat supply system that draws steam from the power plant boiler, which can be used at a lower cost thermoelectric decoupling at a cost

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