Thermodynamic comparison of waste-heat utilization schemes in power plants

SONG Xiaona; HAN Yu; ZHANG Chenxu; XU Gang; LIU Chao; YANG Yongping

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Thermodynamic comparison of waste-heat utilization schemes in power plants

更新时间：2025-09-28

- Thermodynamic comparison of waste-heat utilization schemes in power plants
- Thermal Power Generation Vol. 43, Issue 8, Pages: 14-18(2014)
- 作者机构：
  
  1. 北京信息科技大学机电实习中心
  2. 华北电力大学国家火力发电工程技术研究中心
- 作者简介：
- 基金信息：
- DOI：
  CLC： TK115;TM621
- Published：2014
- 稿件说明：
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SONG Xiaona, HAN Yu, ZHANG Chenxu, et al. Thermodynamic comparison of waste-heat utilization schemes in power plants[J]. Thermal power generation, 2014, 43(8): 14-18.
DOI：

SONG Xiaona, HAN Yu, ZHANG Chenxu, et al. Thermodynamic comparison of waste-heat utilization schemes in power plants[J]. Thermal power generation, 2014, 43(8): 14-18. DOI：

摘要

我国电站普遍存在燃煤耗量高

机组效率低的问题

在锅炉尾部烟道增设余热利用系统是解决此问题的重要手段之一。以国内某超超临界1 000MW机组为例

对电站传统余热利用方案和新型并联余热利用方案进行了热力计算及火用分析对比。结果表明:新型并联余热利用方案可使机组供电煤耗降低值增至传统余热利用方案的2倍

空气加热部分火用损降低5.4MW

使空气预热器火用效率由78.3%提高至85.0%;机组热功转换效率显著提高

节能效果显著。

Abstract

Large coal consumption and low unit efficiency are common issues in China's current power plants.Generally

adding waste-heat utilization system in rear gas flue of boilers is an important way to solve this problem.Taking a domestic ultra supercritical 1 000 MW unit as the example

thermodynamic calculation and exergy analysis of the conventional waste heat utilization scheme and the new parallel connection waste heat utilization scheme were conducted.Moreover

comprehensive comparison between the above two schemes was carried out.The results show that

compared with the conventional waste heat utilization scheme

the net coal consumption rate reduction of the new parallel connection waste heat utilization scheme rose from 1.80g/(kW·h)to 3.62g/(kW·h)

reducing exergy loss of 5.4MW during the air preheating

improving the exergy efficiency of the air preheater from 78.3%to 85.0%.To sum up

the new parallel connection waste heat utilization scheme dramatically increased the unit efficiency and had great energy-saving effect.

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Thermal economic analysis on an ultra supercritical unit with second reheat cycle

CONTRAST STUDY ON CALCULATION METHODS FOR TEMPERATURE OF OUTLET FLUE GAS FROM BOILERS

EXERGY ANALYSIS OF AIR LEAKAGE IN ROTARY AIR PREHEATERS

THERMODYNAMIC ANALYSIS OF DISTRIBUTED ENERGY SYSTEM WITH MICRO-GAS-TURBINE

DISCUSION ON PHYSICAL HEAT OF RAW COAL IN THERMAL CALCULATION FOR COAL-PULVERIZING SYSTEM OF BOILERS

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