Application of low-pressure cylinder zero-output technology to heat supply unit

Abstract

The invention discloses application of a low-pressure cylinder zero-output technology to a heat supply unit. The application comprises the following steps that S1, a medium and low-pressure guide pipe bypass regulating valve is adjusted, and low-pressure cylinder zero output operation cannot be started unless the cooling steam flow is more than 20t / h and a low-pressure cylinder spray cooling device is placed to prevent overtemperature of a last-stage blade and a cylinder body; S2, during the low-pressure cylinder zero-output operation, a flow area with increased blade dynamic stress is rapidly avoided to reduce blade vibration stress; S3, in the process of placing the low-pressure cylinder spray cooling device, the temperature of the last-stage blade is adjusted to be 5-8 DEG C higher than the saturation temperature under corresponding steam exhaust pressure to prevent water erosion of the last-stage blade; and S4, the time for starting the low-pressure cylinder zero-output operation every time is not less than two hours, and before the low-pressure cylinder zero-output operation is quit, the water supply temperature of a heat supply network is increased, and the heat storage capacity of the heat supply network is increased, so that the stability of the water supply temperature of the heat supply network after the operation is quit is ensured.

Description

technical field [0001] The invention relates to the technical field of low-pressure cylinder zero output, and the specific field is the application of low-pressure cylinder zero output technology in heating units. Background technique [0002] After the successful zero-efficiency operation of the low-pressure cylinder, a new idea of ​​deep peak regulation and thermoelectric decoupling for domestic units was proposed. It has the advantages of low investment, small construction volume, obvious energy saving and consumption reduction, large heating capacity, deep peak shaving ability, and quick response to load increase and decrease. 96t / h, can increase the heating capacity by 69MW, increase the area by about 1.33 million square meters, reduce the power generation power by 20MW, and reduce the coal consumption of power generation by 37g / kWh. About 50-65MW, the coal consumption rate of power generation is reduced by 10-18g / kWh, but the low-pressure cylinder zero output technolo...

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Problems solved by technology

[0003] The purpose of the present invention is to provide the application of low pressure cylinder zero output technology in the heating unit to solve the problem that the existing low pressure cylinder zero output technology in the above background technology is unstable during the operation of the heating unit, and there are still some safety issues question

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