Economic analysis of the collaborative waste heat utilization system of the CFB unit

ZHANG Wenyuan

doi:10.19666/j.rlfd.201711157

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Economic analysis of the collaborative waste heat utilization system of the CFB unit

更新时间：2025-09-28

- Economic analysis of the collaborative waste heat utilization system of the CFB unit
- Thermal Power Generation Vol. 47, Issue 6, Pages: 116-120(2018)
- 作者机构：
  
  1. 格盟国际能源有限公司
  2. 山西崇光发电有限责任公司
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.201711157
  CLC： TK223.2
- Published Online：06 June 2018，
  
  Published：2018
- 稿件说明：
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ZHANG Wenyuan. Economic analysis of the collaborative waste heat utilization system of the CFB unit[J]. Thermal power generation, 2018, 47(6): 116-120.
DOI：

ZHANG Wenyuan. Economic analysis of the collaborative waste heat utilization system of the CFB unit[J]. Thermal power generation, 2018, 47(6): 116-120. DOI： 10.19666/j.rlfd.201711157.

摘要

针对循环流化床(CFB)机组采用低温省煤器加滚筒冷渣器回收低温余热时存在凝结水流量分配不足问题

提出了一种冷渣器、暖风器与低温省煤器3个设备组成协同余热利用系统的新节能方法。该系统中冷渣器与暖风器为闭式循环

冷渣器将回收锅炉底渣的部分余热加热空气预热器进口的一、二次风冷风

由此增加的空气预热器出口烟气余热仍由低温省煤器回收。本文以山西某超临界350 MW CFB机组为例

将协同余热利用系统与传统的滚筒冷渣器、低温省煤器系统进行了经济性对比分析

结果表明协同余热利用系统较原有系统煤耗可降低0.83 g/(k W·h)以上

在CFB机组节能降耗方面有一定推广意义。

Abstract

For the circulating fluidized bed(CFB) unit adopting the low-temperature economizer and the rolling slag cooler to recover the low-temperature waste heat

there is a problem of insufficient condensate flow distribution. To solve this problem

a new energy-saving method of a collaborative waste heat utilization system consisting of the slag cooler

air heater and low temperature economizer is proposed in this study. In this system

the slag cooler and air heater are closed cycles. The slag cooler recovers some of the residual heat from the bottom slag of the boiler

which is used to heat the first and second air of the air preheater inlet. And the increased waste heat of exhaust air flue gas at the outlet of the air preheater is recovered by the low-temperature economizer.Taking a supercritical 350 MW CFB unit in Shanxi province as an example

the economics of both the collaborative waste heat utilization system and the conventional rolling slag cooler and low temperature economizer system are compared and analyzed. The results show that

the coal consumption of the collaborative waste heat utilization system can be reduced by 0.83 g/(k W·h) compared with the conventional system

and this system has certain popularization significance in energy conservation and consumption reduction of the CFB unit.

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Related Author

ZHAO Chenghai2 1.Xi'an Thermal Power Research Institute Co.

MA Xuejiang2

CHEN Xiang2

MA Tao2

MA Wenju2

KANG Xiaoni1

HE Chuan

KONG Dewei

Related Institution

Huaneng Ningxia Daba Power Generation Co., Ltd

Xi'an Thermal Power Research Institute Co., Ltd

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