A high and low pressure bypass control system for intermediate reheat units in the power generation industry

Abstract

The present invention specifically relates to a high and low pressure bypass control system for an intermediate reheat unit used in the power generation industry. The high and low pressure bypass control system includes: a high and low pressure bypass system load control module, an axial displacement latch calculation module, Unit detection module, high-pressure bypass valve and low-pressure bypass valve; lock the current axial displacement value according to the operating state of the steam turbine, and control the corresponding bypass valve to perform loading or unloading actions; the axial displacement lock calculation module is suitable for Calculate the axial displacement change, the unit detection module is suitable for detecting the unit load increase rate, cylinder temperature increase rate, expansion difference change and unit stress, that is, alternately control the high-pressure bypass valve and the low-pressure bypass valve to perform corresponding actions; The invention has the function of automatic control of the high and low pressure bypasses during the steam turbine loading and unloading during the boiler merging and desteaming, and overcomes the problem of thrust tile burning accidents in the traditional high and low pressure bypass systems during normal load reduction and shutdown.

Description

technical field [0001] The invention belongs to the technical field of reheat units, and in particular relates to a high and low pressure bypass control system for an intermediate reheat unit 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, the waste treatment fee is getting lower and lower, and the environmental protection emission indicators are getting stricter, resulting in higher and higher operating costs and profits. Space is getting narrower. At present, the thermal efficiency of the whole plant of domestic conventional waste-to-energy projects is about 21%. The Jiangyin Phase III project adopts the reheating technology of two furnaces and one main engine in the industry. After a third-party functional test, the thermal efficiency of the whole plant reaches 28...

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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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