Water loss protection structure for circulating fluidized bed boiler

A technology of circulating fluidized bed and protective structure, applied in steam boilers, steam boiler accessories, steam boiler components, etc., can solve problems such as high maintenance costs and loss of water supply, and achieve extended life, reduced waste, and a wide range of applications. Effect

Pending Publication Date: 2020-07-14
NORTH CHINA POWER ENG +3
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the probability of loss of water supply due to power failure in the whole plant is extremely low, and the emergency water supply system must be put into use immediately after the water loss accident occurs, and regular trial operation is usually required, so the daily operation and maintenance costs are relatively high

Method used

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  • Water loss protection structure for circulating fluidized bed boiler
  • Water loss protection structure for circulating fluidized bed boiler

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Embodiment Construction

[0020] After the superheater 3 (or water-cooled wall) of the boiler is the outlet pipeline 1 of the superheater, and a safety valve and a PCV valve are arranged on the outlet pipeline 1 . After the loss of water accident, the steam pressure rises, and the PCV valve and safety valve will quickly take off after reaching the take-off pressure to discharge the steam. When the steam pressure falls back to the set reseating pressure, the PCV valve and safety valve are reseated.

[0021] Since the PCV valve and safety valve are set to protect the superheater, their capacity and take-off pressure are also selected according to the safety principle of protecting the superheater, and the parameter settings of the PCV valve and safety valve are stipulated by national standards and cannot be changed at will. Therefore, the arrangement of the existing valve body cannot discharge the steam in the heating surface at an optimal discharge rate so as to protect the heating surface.

[0022] Th...

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PUM

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Abstract

The invention provides a water loss protection structure for a circulating fluidized bed boiler. A PVC valve and a safety valve are arranged on an outlet pipeline of a boiler superheater, a dischargecontrol valve is further arranged on the outlet pipeline of the superheater, the offline pressure of the discharge control valve is lower than the PVC valve and the safety valve, and the discharge control valve is connected to an emergency power supply. When a water loss accident happens to the circulating fluidized bed boiler, the discharge control valve can quickly discharge a large amount of steam generated in the boiler at a certain rate, thus it is ensured that heated faces such as a water cooled wall of the boiler do not exceed the temperature, an emergency water complementing system with the high investment can be substituted, and extra maintenance is usually not needed.

Description

technical field [0001] The invention belongs to an equipment safety protection device for a circulating fluidized bed boiler, in particular to a device for protecting a heating surface from overheating when a water loss accident occurs. Background technique [0002] Circulating fluidized bed boilers have been widely used in China because of their wide fuel adaptability, the ability to burn special fuels such as low calorific value fuels, and the low cost of pollutant control. my country's circulating fluidized bed technology is developing very rapidly, and it is the country with the largest number of circulating fluidized bed boilers in operation in the world. In recent years, dozens of 350MW CFB units with supercritical parameters have been put into operation in China. At present, the largest supercritical circulating fluidized bed unit in the world is the Baima Phase II 600MW unit in my country. [0003] One of the important differences between circulating fluidized bed b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22B37/44
CPCF22B37/446
Inventor 李少华彭红文张缦杨海瑞吕俊复谈琪英
Owner NORTH CHINA POWER ENG
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