CAUSE ANALYSIS OF ELBOW CRACK FOR HEADER'S CONNECTING TUBES OF BOILER'S REHEATER CONCERNING 300 MW UNIT

LIU Fa-sheng; CHEN Gang; WU Qi-xingMid-china University of Science & Technology

doi:10.19666/j.rlfd.2007.10.019

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CAUSE ANALYSIS OF ELBOW CRACK FOR HEADER'S CONNECTING TUBES OF BOILER'S REHEATER CONCERNING 300 MW UNIT

更新时间：2025-09-28

- CAUSE ANALYSIS OF ELBOW CRACK FOR HEADER'S CONNECTING TUBES OF BOILER'S REHEATER CONCERNING 300 MW UNIT
- Thermal Power Generation Issue 10, Pages: 66-68(2007)
- 作者机构：
  
  华中科技大学
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.2007.10.019
  CLC： TK223.2
- Published：2007
- 稿件说明：
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LIU Fa-sheng, CHEN Gang, WU Qi-xingMid-china University of Science & Technology. CAUSE ANALYSIS OF ELBOW CRACK FOR HEADER'S CONNECTING TUBES OF BOILER'S REHEATER CONCERNING 300 MW UNIT[J]. Thermal power generation, 2007, (10): 66-68.
DOI：

LIU Fa-sheng, CHEN Gang, WU Qi-xingMid-china University of Science & Technology. CAUSE ANALYSIS OF ELBOW CRACK FOR HEADER'S CONNECTING TUBES OF BOILER'S REHEATER CONCERNING 300 MW UNIT[J]. Thermal power generation, 2007, (10): 66-68. DOI： 10.19666/j.rlfd.2007.10.019.

摘要

某电厂2号炉再热蒸汽微量喷水减温器后部弯头发生多次开裂

严重影响了机组运行。通过对管件检查、煤质分析和再热器冷态试验

判断弯头开裂是典型的热疲劳断裂

是因实际煤种偏离设计煤种、炉膛出口烟温偏差导致受热面超温、频繁投入减温水所致。据此

提出了二次风反切改造

提高给水和蒸汽品质

改善入炉煤质和喷头的雾化效果等措施及建议。

Abstract

The elbow behind micro-spray desuperheater of boiler no.2 in one power plant has cracked many times

seriously affecting operation of the unit.Through inspection of the pipes

analysis of coal quality

and cold-state test of the reheater

it is believed that the crack of elbow is a typical thermal fatigue crack

resulting from deviation of actual coal sort from the designed coal sort

and temperature deviation of flue gas at outlet of the furnace

thus

leading to overtemperature of the heating surface

and frequently putting desuperheating water into service.Based on these

measures and recommendations

such as retrofitting the secondary air into reverse tangential firing

enhancing the feed-water and steam quality

improving quality of furnace-incoming coal and atomizing effectiveness of the nozzles

etc.

have been put forward.

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