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Induced draft fan RB control method of high-sodium lignite tower boiler unit

A tower boiler and control method technology, applied in pump control, control system, combustion method, etc., can solve problems such as unit shutdown, furnace pressure exceeding limit, etc., achieve the effect of convenient configuration, improved stability and safety

Inactive Publication Date: 2015-12-09
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using this method on a high-sodium lignite tower boiler unit can solve the problem that the furnace pressure exceeds the limit or even shut down the unit when the induced draft fan RB occurs, and improve the stability and safety of the unit operation

Method used

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  • Induced draft fan RB control method of high-sodium lignite tower boiler unit
  • Induced draft fan RB control method of high-sodium lignite tower boiler unit
  • Induced draft fan RB control method of high-sodium lignite tower boiler unit

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Embodiment Construction

[0031] The present invention will be further described in detail below in conjunction with specific embodiments.

[0032] The invention discloses a method for controlling induced draft fan RB of a high-sodium lignite tower boiler unit. The unit includes a boiler, a steam turbine, a generator, a coal mill, a primary fan, a blower fan, a draft fan, a plasma burner, and a DCS control system; the blower There are two sets of induced draft fans and induced draft fans, which are arranged on both sides of the boiler; the coal mill includes N sets of medium-speed coal mills arranged in an upper and lower structure (the pulverized coal pipeline of the coal mill is arranged in an upper and lower structure in the boiler); the plasma The burner includes two layers of plasma burners arranged in an up and down structure, and each layer includes M plasma burners;

[0033] After the induced draft fan RB occurs, the DCS control system performs the following controls:

[0034] a): Switch the u...

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Abstract

The invention discloses an induced draft fan RB control method of a high-sodium lignite tower boiler unit. After induced draft fan RB happens, a DCS is controlled in following manners that a) a unit control manner is switched to a TF manner, wherein master control of a boiler is switched into a manual manner; b) a main steam pressure set value firstly tracks actual main steam pressure, and then the RB sliding and pressing rate is changed into a target pressure value; c) air feeders on the same side are tripped, and the adjustable vane opening degrees of induced draft fans and air feeders which are not tripped on the opposite side are each increased at a certain rate on the basis of an original opening degree till a target value is achieved; d) upper layer coal mills are sequentially tripped, and finally four coal mills are reserved to operate; and a lower layer plasma burner is started to operate, and an upper layer plasma burner is started to operate after time is delayed by t2; and e) when a load reaches a target load, induced draft fan RB control automatically ends, or after unit main parameters are stable, an operating person manually confirms that induced draft fan RB control ends. The induced draft fan RB control method can improve RB control stability and safety.

Description

technical field [0001] The invention belongs to the technical field of control engineering. The invention relates to a RB control method for an induced draft fan of a high-sodium lignite tower boiler unit. Background technique [0002] Thermal power generation refers to the general term for using the heat generated by the combustion of coal and other fuels to heat water, turning the water into high-temperature, high-pressure steam, and then driving the generator to generate electricity by the steam; thermal power generating units mainly include boilers, steam turbines, power generation machine, coal mill, primary fan, blower, induced draft fan, DCS control system and other equipment; the basic process of thermal power generation is to first send fuel into the boiler, and at the same time send into the air, the boiler injects chemically treated feed water, and uses the fuel to burn and release The heat energy of the water turns the water into high-temperature and high-pressu...

Claims

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Application Information

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IPC IPC(8): F22B35/00F04D27/00F23N1/02
Inventor 陈厚涛傅强王伯春刘文丰
Owner STATE GRID CORP OF CHINA
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