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Hearth pressure control method of vibrating grate boiler

A technology of vibrating grate and pressure control, which is applied in the direction of controlling combustion, lighting and heating equipment, etc., and can solve problems such as incomplete combustion of fuel, reduction of secondary air, and reduction of boiler efficiency

Inactive Publication Date: 2010-03-03
CHINA ELECTRIC POWER RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the total air volume does not change with the vibration of the grate, the secondary air will naturally decrease, which may cause incomplete combustion of fuel
Not only reduces the efficiency of the boiler, but also brings safety hazards such as combustion of the rear heating surface

Method used

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  • Hearth pressure control method of vibrating grate boiler
  • Hearth pressure control method of vibrating grate boiler
  • Hearth pressure control method of vibrating grate boiler

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0039] 1. Model analysis of furnace pressure

[0040] The vibrating grate biomass boiler has periodic disturbances to the boiler control due to the periodic vibration of its grate. On the basis of the original furnace pressure control system, a set of auxiliary control methods for grate vibration is designed to control the boiler air and smoke. The system performs rapid adjustment. By adjusting the amount of grate air volume, secondary air volume and induced air volume, the air and smoke system can overcome the disturbance caused by the grate vibration and realize the stable control of the furnace pressure. A schematic diagram of the flue gas system of a vibrating grate biomass boiler figure 2 As shown, the blower sends air into the system. The air is heated to about 190°C by the air preheater, and is divided into three parts: grate air, ignition air and secondary air. The grate air enters the air chamber through the grate air door. Pass through the grate and enter the furnace, ...

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Abstract

The invention relates to a hearth pressure control method of a vibrating grate boiler, which is an assistant adjusting method aiming at grate vibrating on the basis of an original hearth pressure control system, and can judge the hearth pressure change according to the influence of the grate vibrating on the flow of all the parts of an air and flue system, reduce grate air flow in due time and increase secondary air flow through advanced adjustment of all the executing mechanisms of the air and flue system, and provide guarantee for the safe combustion of the fuel while realizing the stable control of the hearth pressure. The method well solves the problems of raising, oscillating and the like of the hearth pressure along with the grate vibrating, improves the efficiency of the control system, improves the control effect, and is beneficial to the stabilization of the boiler burning state, and the improvement of the economical and safe operation level of the boiler.

Description

Technical field [0001] The invention relates to the field of thermal control, in particular to a furnace pressure control method of a vibrating grate boiler. Background technique [0002] In recent years, my country's biomass direct-fired power generation technology has developed rapidly, mainly introducing water-cooled vibrating grate technology and equipment, and more than a dozen power plants have been put into operation for power generation. However, during the operation of the boiler, the periodic vibration of the grate causes the boiler operating state to have obvious periodicity with the vibration, which is mainly reflected in the periodic fluctuation of the furnace pressure, which brings periodic disturbances to the automatic control of the boiler. [0003] figure 1 It is the fluctuation of furnace pressure with grate vibration during operation of a large-scale direct-fired biomass power plant boiler. The operator controls the furnace pressure at about -200Pa, such as figu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23N5/00
Inventor 王乐王志凯
Owner CHINA ELECTRIC POWER RES INST
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