Wind-water combined recovery system for slag heat in circulating fluidized bed boiler, and control method thereof

A circulating fluidized bed and heat system technology, applied in fluidized bed combustion equipment, combustion methods, indirect heat exchangers, etc., can solve the problems of low steam energy grade and low heat utilization rate of slag, and achieve the circulation medium consumption Stability, high recycling rate, and efficiency-enhancing effects

Inactive Publication Date: 2019-01-29
CHINA ENERGY ENG GRP GUANGDONG ELECTRIC POWER DESIGN INST CO LTD
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Problems solved by technology

[0005] Based on this, it is necessary to provide a circulating fluidized bed boiler with high slag heat utilization rate for the problem of low slag heat utilization rate due to the low grade of steam energy used by the low-pressure heater. Fluidized bed boiler air-water combined recovery slag heat system and its control method

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  • Wind-water combined recovery system for slag heat in circulating fluidized bed boiler, and control method thereof

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Embodiment Construction

[0018] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the associated drawings. Preferred embodiments of the invention are shown in the accompanying drawings. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0019] It should be noted that when an element is referred to as being “fixed” to another element, it can be directly on the other element or there can also be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present. The terms "inner", "outer", "left", "right" and similar expressions are used herein for the purpose of descripti...

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Abstract

The invention relates to a wind-water combined recovery system for slag heat in a circulating fluidized bed boiler, and a control method thereof. The wind-water combined recovery system for slag heatcomprises a closed circulating sub-system, a cold air heating sub-system and an air preheater bypass sub-system, wherein the closed circulating sub-system enables a circulating medium to reciprocate between a slag cooler and an air heater of the cold air heating sub-system through a circulating device, so that slag continuously carries out heat exchange with cold air; the heated cold air is conveyed into an air preheater and continues to absorb smoke heat coming from a smoke discharge port of the boiler; and the redundant smoke heat is sequentially transferred and conveyed to a feed water heatexchanger and a condensed heat exchanger in the air preheater bypass sub-system, so that the smoke heat carries out heat exchange with feed water and condensed water. According to the wind-water combined recovery system for slag heat in the circulating fluidized bed boiler, and the control method thereof, high recovery and utilization rate for the slag heat is achieved, so that the efficiency ofthe circulating fluidized bed boiler is increased, and the power generation coal consumption of a unit is reduced.

Description

technical field [0001] The invention relates to the technical field of circulating fluidized bed boilers, in particular to a circulating fluidized bed boiler air-water combined recovery slag heat system and a control method thereof. Background technique [0002] Circulating fluidized bed boiler (CFB) has the advantages of wide fuel adaptability, wide capacity range, high combustion efficiency, low-temperature combustion, low nitrogen oxide emissions, and direct desulfurization during combustion, making it a low-heat boiler. It is the preferred furnace type for low-quality fuel power plant boilers. [0003] When the circulating fluidized bed boiler burns low-calorific value low-quality fuel, it will produce a huge amount of slag, and the temperature of the slag is very high. If the heat of the slag is not utilized, its heat loss will account for about 2% of the total calorific value of the boiler fuel. The numbers are quite impressive. [0004] The existing slag heat recove...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C10/28F23J15/06F23L15/02F28D7/08
CPCF23C10/28F23J15/06F23L15/02F28D7/08Y02E20/34
Inventor 尹进吴阿峰霍沛强樊晓茹张翔宇刘广林
Owner CHINA ENERGY ENG GRP GUANGDONG ELECTRIC POWER DESIGN INST CO LTD
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