High and low pressure bypass control system for intermediate reheating unit in power generation industry

Abstract

The invention particularly relates to a high and low pressure bypass control system for an intermediate reheating unit in the power generation industry. The high and low pressure bypass control system comprises a high and low pressure bypass system load control module, an axial displacement latch calculation module, a unit detection module, a high pressure bypass valve and a low pressure bypass valve; the current axial displacement value is locked according to the running state of a steam turbine, and a corresponding bypass valve is controlled to execute the load increasing or load decreasing action; and the axial displacement latch calculation module is suitable for calculating the axial displacement variable quantity, and the unit detection module is suitable for detecting the unit load rise rate, the cylinder temperature rise rate, the differential expansion variable quantity and the unit stress, that is, the high-pressure bypass valve and the low-pressure bypass valve are alternately controlled to execute corresponding actions. The high and low pressure bypass control system has the function of automatically controlling the high-pressure bypass and the low-pressure bypass during the load increasing and reducing period of the steam turbine during the steam merging and steam releasing period of a boiler, and solves the problem that the traditional high-pressure bypass system and the traditional low-pressure bypass system have the thrust pad burning accident during the normal load reducing shutdown period.

Description

technical field [0001] The invention belongs to the technical field of reheating units, in particular to a high and low pressure bypass control system for intermediate reheating units used in the power generation industry. Background technique [0002] As my country's urbanization rate and people's attention to the living environment continue to increase, the market competition in the waste incineration power generation industry is fierce, and the waste disposal fee is getting lower and lower. The space is getting narrower and narrower. At present, the thermal efficiency of the whole plant of domestic conventional waste-to-energy projects is about 21%. The third phase of Jiangyin project adopts the reheating technology of two furnaces and one machine mother control in the industry. According to the third-party function test, the thermal efficiency of the whole plant reaches 28.69%, and the power generation capacity of 1 ton of waste into the furnace is 595kW.h / t. However, t...

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Problems solved by technology

However, there are many technical problems in the control of the bypass system of the main pipe reheating unit, which hinder the popularization and application of this technology. The details are as follows: the layout of the high and low pressure bypass systems is complicated, and the operation is complicated; the operation of adding and reducing the load of the steam turbine during the boiler combination and steam removal is difficult. , high accident rate

The bypass system of the traditional main pipe reheat unit controls the thrust tile burning accident during the normal load reduction shutdown; after investigation, the two furnaces and one machine mother pipe reheat unit in the operation of the foreign Vietnamese coal power project also occurred during the boiler and steam removal period. The operation of adding and subtracting loads is difficult, and there is an accident of overburning thrust pads

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