Condensing steam type and high back pressure switching heat supply method for steam turbine generator set

Abstract

The invention relates to the technical field of heat supply, power generation and control analysis of heat supply, power generation and control analysis of heat supply, in particular to a steam turbine generator set condensing steam and high back pressure switching heat supply method. Mutual switching operation of the heat supply steam turbine generator unit between the condensing type working condition and the high back pressure working condition is achieved through the change-over switch module, the low-pressure cylinder can completely cut off zero output through the switching control module, the low-pressure cylinder can be put into operation at any time to increase the output of the generator, the excessive correlation dependency relation between unit heat supply and power generation is reduced, and the power generation efficiency is improved. The comprehensive utilization efficiency of energy is improved. And when the heat supply steam quantity is large, high-back-pressure working condition operation is carried out, when the heat supply steam quantity is small or no steam is supplied and a generator is required to be high in power, condensed steam type working condition operation is carried out, quick response and regulation when the heat supply steam quantity or the power generation power is greatly changed are met, and the auxiliary service capacity of a unit participating in power grid peak regulation, frequency modulation and the like is improved.

Description

technical field [0001] The invention relates to the technical field of heat supply and power generation and its control analysis, in particular to a heat supply method for switching between condensing steam and high back pressure for a steam turbine generating set. Background technique [0002] In order to alleviate the contradictions related to the heat and power intensity of cogeneration units and improve the operating flexibility of the units, the transformation and application of zero-output technology for low-pressure cylinders of steam turbines has been carried out in recent years. In "300 MW Steam Turbine Low-pressure Cylinder Zero Output Technology", Chen Jianguo et al. considered the safety of the low-pressure cylinder final-stage blades in the low-pressure cylinder zero-output operation, and worked out the perfect low-pressure The technical measures such as flow cooling steam system and maintaining high vacuum of low-pressure cylinder; Liu Qijun introduced the key ...

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Problems solved by technology

The low-pressure cylinder "zero output" technical measure involves many equipment, complicated process, and long construction period; and under the small steam flow rate of the low-pressure cylinder, the rotor of the low-pressure cylinder runs continuously at high speed for a long time, and the life of the low-pressure cylinder and its rotor will be affected; the heat supply of the unit In the state of condensing steam operation, not only a large amount of circulating water is required, but also a large amount of exhaust heat loss of the steam turbine is caused; due to the influence of "power determination by heat", the electric power adjustment range of the unit is small, and it is difficult for the unit to participate in auxiliary services such as power grid peak regulation and frequency regulation

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