Application of Built-in Gas-to-Gas Heat Exchanger in the Urea Pyrolysis System for SCR Denifrication

doi:10.11930/j.issn.1004-9649.201711085

Abstract

Abstract: The urea pyrolysis process adopting the gas-to-gas heat exchanger (GGH) is characterized with simple system and low energy consumption. In this paper, based on the detailed analysis on the characteristics of the GGH, a design of GGH for the use in the process of urea pyrolysis is proposed and applied to the retrofit of the denitration system of a 300-MW unit, in which the original pyrolysis by natural gas heating is changed with GGH. The operation results show that the design of GGH can reduce the natural gas consumption by about 360,000 m³ (standard state) and reduce the operating costs by more than RMB 900,000 yuan each year. The retrofit has obtained good economic benefits.

Key words: thermal power plant, flue gas denitration, SCR, urea pyrolysis, built-in gas-to-gas heat exchanger

CLC Number:

TK01

SONG Jian, HU Zhangmao, DENG Weili, CHEN Donglin, LIU Lianghua, WEI Mianyuan, WEN Cong. Application of Built-in Gas-to-Gas Heat Exchanger in the Urea Pyrolysis System for SCR Denifrication[J]. Electric Power, 2018, 51(7): 145-151.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201711085

https://www.electricpower.com.cn/EN/Y2018/V51/I7/145

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