Heating system modifying method for realizing combination of heat and power by straight condensing unit

Abstract

The invention discloses a heating system modifying method for realizing combination of heat and power by a straight condensing unit. The heat system modifying method is characterized by comprising two implementation manners, consisting of an intermediate exhaust steam extraction manner and a high exhaust steam extraction manner, wherein the implementation manners comprise the following steps of: (1) the intermediate exhaust steam extraction manner: perforating a communication pipe of a turbine for communicating an intermediate-pressure cylinder with a low-pressure cylinder so as to be connected with a heating steam extraction pipe, and arranging a heating steam extraction pipe network to be connected to heat-supplied users; and (2) the high exhaust steam extraction manner: perforating a cold-section pipe in the front of an inlet of a reheater so as to be connected with the heating steam extraction pipe, or perforating a hot-section pipe at the back of an outlet of the reheater so as to be connected with the heating steam extraction pipe by taking exhausted steam of a high-pressure cylinder of the turbine as a heating source, and arranging a heating steam extraction network to be connected to the heat-supplied users, wherein the heating steam extraction pipe is provided with a steam extraction pressure regulating valve, a safety valve and a check valve. The invention provides a method for modifying a generator unit to be a heat and power combined device; and heat is supplied for the users by utilizing steam of a turboset and the advantages of environment friendliness, energy conservation and good economic benefits are achieved.

Description

technical field [0001] The invention relates to the technical field of power generation, in particular to a transformation method for transforming a generating set into an electric-heat cogeneration equipment. Background technique [0002] At present, under the circumstances that the coal price keeps rising and the country has not adjusted the on-grid electricity price, the economic benefits of power plant enterprises have dropped significantly. Cogeneration of heat and power has been introduced, and small boilers and small thermal power plants with high coal consumption, low efficiency, and poor environmental protection have been shut down in a planned manner. For some medium-sized generating units, such as 300MW pure condensing units, compared with small generating units, the unit efficiency is relatively low. It is equipped with a high-efficiency flue gas dust removal and desulfurization device. The coal consumption of the machine furnace and the steam consumption of the ...

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Problems solved by technology

[0002] At present, under the circumstances that the coal price keeps rising and the country has not adjusted the on-grid electricity price, the economic benefits of power plant enterprises have dropped significantly. Cogeneration of heat and power has been introduced, and small boilers and small thermal power plants with high coal consumption, low efficiency, and poor environmental protection have been shut down in a planned manner. For some medium-sized generating units, such as 300MW pure condensing units, compared with small generating units, the unit efficiency is relatively low. It is equipped with a high-efficiency flue gas dedusting and desulfurization device. The coal consumption of the machine furnace and the steam consumption of the power generation are relatively low, but there is still a certain gap compared with large-scale units such as 600MW and 1000MW.

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