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A Uniform Air Distribution System for External Heat Exchanger of Supercritical Circulating Fluidized Bed Boiler

A technology of external heat exchanger and circulating fluidized bed, which is applied in the field of uniform air distribution system, can solve the problems of local poor fluidization and obvious side wall effect of the external heat exchanger, so as to eliminate the phenomenon of local poor fluidization and ensure good performance. Fluidization, ensuring uniform and good heat exchange

Active Publication Date: 2018-02-06
DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems existing in the prior art, the object of the present invention is to provide an external heat exchanger for a supercritical circulating fluidized bed boiler that can effectively solve the problems of poor local fluidization and obvious side wall effects in the external heat exchanger. Uniform air distribution system

Method used

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  • A Uniform Air Distribution System for External Heat Exchanger of Supercritical Circulating Fluidized Bed Boiler

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0038] The current 600MW CFB boiler is the largest capacity supercritical circulating fluidized bed boiler that has been put into operation in the world. The boiler is equipped with 6 external heat exchangers. The external heat exchangers have been operating stably since they were put into operation, and the steam parameters have reached According to the design requirements, the steam and bed temperature regulation performance is relatively good, but there are problems such as large temperature difference on both sides, large wall temperature deviation of the tube screen, overheating of the wall temperature, poor fluidization of the local (side wall) in the bed, and uneven heat transfer. , affecting the safe and economical operation of the external heat exchanger.

[0039] Through the test and analysis of the operating parameters of the external heat exchanger, the main reason is that the flow of hot ash entering the heat exchange chamber of the external heat exchanger along th...

example 2

[0041] Example 2: Redesign and optimization of a 660MW supercritical circulating fluidized bed boiler in a certain place.

[0042] In the design process of the external heat exchanger of a 660MW supercritical circulating fluidized bed boiler in a certain place, according to the operation conditions and optimization test results of the external heat exchanger of the 600MW supercritical circulating fluidized bed boiler in Example 1, the external heat exchange On the basis of the design of the external heat exchanger, the air distribution system, tube panel layout and hanging tube structure of the 660MW boiler's external heat exchanger have been improved and optimized to ensure that the external heat exchanger has better safety and economy. sex.

example 3

[0043] Example 3: Layout scheme selection for reheating heating surface of 660MW supercritical circulating fluidized bed boiler

[0044] During the research and development and design of the 660MW supercritical circulating fluidized bed boiler, after the reheat temperature was increased to 605°C, the thermal calculation results showed that based on the wall temperature and deviation of the high temperature reheater of the 600MW supercritical boiler before the transformation, the boiler high temperature The wall temperature of the reheater will be close to the maximum allowable temperature value of the material, and its safety margin is very small. Therefore, whether the reheat system can still adopt the two-stage arrangement or three-stage arrangement for safety has brought great difficulties to the design. problem. According to the technical scheme proposed by the present invention, after the external heat exchanger of the 600MW supercritical boiler is transformed, the operat...

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Abstract

The invention discloses an even air distributing system for an external heat exchanger of a supercritical circulating fluidized bed boiler. An air bin fluidized air chamber is arranged under an air bin and composed of a plurality of independent sub-air bin fluidized air chambers. A heat exchange bin fluidized air chamber is arranged under a heat exchange bin and composed of a plurality of independent sub-heat exchange bin fluidized air chambers. The even air distributing system comprises inlet ash channel purging air, outlet ash channel purging air, air bin fluidized air and heat exchange bin fluidized air, wherein the inlet ash channel purging air is arranged in an inlet ash channel; the outlet ash channel purging air is arranged in an outlet ash channel; the air bin fluidized air is composed of sub-air bin fluidized air arranged in all the sub-air bin fluidized air chambers; the heat exchange bin fluidized air is composed of sub-heat exchange bin fluidized air arranged in all the sub-heat exchange bin fluidized air chambers. Air-supply pipelines for the inlet ash channel purging air, the outlet ash channel purging air, the sub-air bin fluidized air and the sub-heat exchange bin fluidized air are each provided with a regulating valve.

Description

technical field [0001] The invention relates to the technical field of an external bed air distribution system, and more specifically, relates to a uniform air distribution system for an external heat exchanger of a supercritical circulating fluidized bed boiler. Background technique [0002] The main development direction of circulating fluidized bed (CFB) boilers is large-scale and supercritical parameters. From the perspective of technological development, CFB boilers with external heat exchangers (EHE) are an important development direction of large CFB boilers, and external replacement The main technical difficulty in the application of heat heater (EHE) is the control and uniform distribution of ash flow under high temperature and high concentration state. [0003] The external heat exchanger of the large-capacity supercritical circulating fluidized bed boiler that has been put into operation at present has problems such as large temperature difference between the left...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23C10/20
CPCF23C10/20F23C2206/10
Inventor 郑兴胜宋刚周棋苏虎聂立杨振礼徐鹏胡修奎
Owner DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP