Wide-load medium-pressure heat supply mode based on central regulating valve parameter regulation

Abstract

The invention relates to a wide-load medium-pressure heat supply mode based on central regulating valve parameter regulation. The wide-load medium-pressure heat supply mode is characterized in that firstly, the annual average load of corresponding units in a power plant is counted, a position close to a heat supply steam extraction parameters under the average load is figured out according to thethermodynamic calculation, the average load is taken as a design point, and the position is taken as a heat supply steam extraction port; above the design point load, the extraction pressure does notneed to be regulated; under the design point load, the extraction pressure is adjusted through a central regulating valve, so that the extraction pressure parameters are prevented from not meeting therequirement; secondly, a second reheater is additionally arranged, and extracted steam directly enters the second reheater without passing through a reheating pipeline; when heat is supplied, the steam is heated by the second reheater and used for industrial heat supply after the steam temperature is increased; and when no heat is supplied, the steam discharged from the second reheater returns toa reheating cold section pipeline after temperature reduction and pressure reduction. The wide-load medium-pressure heat supply mode provides a new mode for medium-pressure heat supply, solves the problems of high-quality steam waste and insufficient heat supply parameters, and realizes the efficient, reliable, continuous and peak-adjustable heat supply.

Description

technical field [0001] The invention relates to a wide-load medium-voltage heating mode based on the parameter adjustment of the medium-adjustment door, and belongs to the technical field of thermal power cogeneration. Background technique [0002] Cogeneration of heat and power is an effective means to reduce unit emissions and increase economic benefits of power plants. With the vigorous development of my country's biopharmaceutical, chemical and other industries, the demand for high-parameter steam (4MPa~7MPa) is increasing. The boiler efficiency of large-scale thermal power generation unit is small, the boiler combustion efficiency is high, the equipment such as desulfurization and denitrification is well-equipped, and environmental protection supervision is strict, and it is a clean source that provides high-parameter steam; A reliable, steady source of steam. At present, the way of using large-scale thermal power generating units to provide high-parameter steam is ma...

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Problems solved by technology

At present, the way of using large-scale thermal power generating units to provide high-parameter steam is mainly to reduce the temperature and pressure of high-quality steam, or to drill holes in the reheating pipe of the steam turbine to extract steam, but the above methods have shortcomings, such as: 1. The main Steam directly reduces temperature and depressurizes heat supply, and the economic loss is relatively large

2. The main steam is equipped with a small back pressure machine, and the exhaust steam of the back pressure machine is used for heat supply, which is still a temperature reduction and pressure reduction in essence, and part of the electric load can be recovered, but the power generation efficiency of the small back pressure machine is much lower than that of a large unit, and the high The small parameter back press needs to use the same high-temperature alloy material as the large machine, which is expensive

3. Drilling holes on the reheating pipe to extract steam, the pressure of the steam supplied (usually 3~5MPa) and temperature cannot meet the demand, especially in low load conditions

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