An energy-saving coordinated control method for thermal power generating units

Abstract

The invention discloses an energy-saving coordination control method for coal-fired power units, comprising the steps as follows: (1) fully opening the capacity air damper of a coal mill; (2) forming a primary air pressure set value feed-forward signal based on a unit load instruction; (3) correcting a deviation signal of the main steam pressure and a set value thereof through PID operation to form a primary air pressure set value correction signal, and adding the signal and the primary air pressure set value feed-forward signal in step (2) together to form a primary air pressure set value signal; (4) correcting a deviation signal of the primary air pressure and a set value thereof through PID operation, and adjusting the primary air pressure to control the amount of fuel into a boiler furnace; and (5) controlling the unit power by adjusting the high-pressure control valve of a steam turbine. According to the invention, by fully opening the capacity air damper of the coal mill and adjusting the primary air pressure through a primary fan frequency converter to control the amount of fuel into the boiler furnace, the throttling loss of the capacity air damper of the coal mill is reduced, and the economic benefit of unit operation is improved.

Description

technical field [0001] The invention belongs to the technical field of control engineering. It relates to an energy-saving coordinated control method for a thermal power generating set. Background technique [0002] Energy conservation and emission reduction is a major strategic issue related to sustainable economic and social development. The electric power industry is not only a creator of high-quality clean energy, but also a large primary energy consumer and a major polluter. Therefore, it is also a key area for the country to implement energy conservation and emission reduction. Energy saving and consumption reduction of thermal power generating units is an important measure to respond to the national energy saving and emission reduction and low-carbon economy, and it is an effective measure to enhance the market competitiveness of thermal power plants. [0003] Thermal power generation refers to the general term for using the heat generated by the combustion of coal ...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide an energy-saving coordinated control method for a thermal power generation unit in view of the defects of the prior art, which is used in the boiler / steam turbine coordinated control system of a thermal power generation unit with a double-inlet and double-outlet coal pulverization system. The method can solve the problem of large throttling loss of the coal mill capacity air adjustment door, improve the economical efficiency of the unit, and reduce energy consumption

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