Study of Ammonia Removal from Coal-Gasified Fuel

Takeharu Hasegawa; Mikio Sato; Toshihiko Nakata

doi:10.1299/kikaib.61.4483

Study of Ammonia Removal from Coal-Gasified Fuel

Takeharu Hasegawa, Mikio Sato, Toshihiko Nakata

Research output: Contribution to journal › Article › peer-review

Abstract

In integrated coal gasification combined cycle power generation (IGCC) systems, ammonia in the gasified fuel is passed through a hot/dry gas cleanup facility into the gas turbine. The ammonia is converted to nitrogen oxides in the combustion process in the gas turbine. Therefore ammonia removal from coal-gasified fuel would effectively reduce NO_x emissions in IGCC systems. We're defined the optimum NO/NH₃ ratio, the optimum concentration of added O₂ and the influence of CO and H₂ in the coal-gasified fuel on NH₃ decomposition and NO reduction by experiments using a tubular flow reactor and numerical analysis based on reaction kinetics. The main results are as follows : (1) The optimum NO/NH₃ ratio is about 1 to maximize NH₃ decomposition and NO reduction. (2) The NH₃ decomposition ratio depends only on H₂, and decreases rapidly with increasing H₂ concentration. (3) The NO reduction ratio decreases with increasing H₂ concentration. (4) This method is effective for decreasing TFN by up to 60% minimizing the total concentration of remaining NH₃ and NO in air-blown coal-gasified fuel.

Original language	English
Pages (from-to)	4483-4491
Number of pages	9
Journal	Transactions of the Japan Society of Mechanical Engineers Series B
Volume	61
Issue number	592
DOIs	https://doi.org/10.1299/kikaib.61.4483
Publication status	Published - 1995 Jan 1
Externally published	Yes

Keywords

Ammonia
Chemical Reaction
Coal Gasification
Kinetics
Nitrogen Oxides

ASJC Scopus subject areas

Condensed Matter Physics
Mechanical Engineering

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title = "Study of Ammonia Removal from Coal-Gasified Fuel",

abstract = "In integrated coal gasification combined cycle power generation (IGCC) systems, ammonia in the gasified fuel is passed through a hot/dry gas cleanup facility into the gas turbine. The ammonia is converted to nitrogen oxides in the combustion process in the gas turbine. Therefore ammonia removal from coal-gasified fuel would effectively reduce NOx emissions in IGCC systems. We're defined the optimum NO/NH3 ratio, the optimum concentration of added O2 and the influence of CO and H2 in the coal-gasified fuel on NH3 decomposition and NO reduction by experiments using a tubular flow reactor and numerical analysis based on reaction kinetics. The main results are as follows : (1) The optimum NO/NH3 ratio is about 1 to maximize NH3 decomposition and NO reduction. (2) The NH3 decomposition ratio depends only on H2, and decreases rapidly with increasing H2 concentration. (3) The NO reduction ratio decreases with increasing H2 concentration. (4) This method is effective for decreasing TFN by up to 60% minimizing the total concentration of remaining NH3 and NO in air-blown coal-gasified fuel.",

keywords = "Ammonia, Chemical Reaction, Coal Gasification, Kinetics, Nitrogen Oxides",

author = "Takeharu Hasegawa and Mikio Sato and Toshihiko Nakata",

year = "1995",

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day = "1",

doi = "10.1299/kikaib.61.4483",

language = "English",

volume = "61",

pages = "4483--4491",

journal = "Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B",

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AU - Hasegawa, Takeharu

AU - Sato, Mikio

AU - Nakata, Toshihiko

PY - 1995/1/1

Y1 - 1995/1/1

N2 - In integrated coal gasification combined cycle power generation (IGCC) systems, ammonia in the gasified fuel is passed through a hot/dry gas cleanup facility into the gas turbine. The ammonia is converted to nitrogen oxides in the combustion process in the gas turbine. Therefore ammonia removal from coal-gasified fuel would effectively reduce NOx emissions in IGCC systems. We're defined the optimum NO/NH3 ratio, the optimum concentration of added O2 and the influence of CO and H2 in the coal-gasified fuel on NH3 decomposition and NO reduction by experiments using a tubular flow reactor and numerical analysis based on reaction kinetics. The main results are as follows : (1) The optimum NO/NH3 ratio is about 1 to maximize NH3 decomposition and NO reduction. (2) The NH3 decomposition ratio depends only on H2, and decreases rapidly with increasing H2 concentration. (3) The NO reduction ratio decreases with increasing H2 concentration. (4) This method is effective for decreasing TFN by up to 60% minimizing the total concentration of remaining NH3 and NO in air-blown coal-gasified fuel.

AB - In integrated coal gasification combined cycle power generation (IGCC) systems, ammonia in the gasified fuel is passed through a hot/dry gas cleanup facility into the gas turbine. The ammonia is converted to nitrogen oxides in the combustion process in the gas turbine. Therefore ammonia removal from coal-gasified fuel would effectively reduce NOx emissions in IGCC systems. We're defined the optimum NO/NH3 ratio, the optimum concentration of added O2 and the influence of CO and H2 in the coal-gasified fuel on NH3 decomposition and NO reduction by experiments using a tubular flow reactor and numerical analysis based on reaction kinetics. The main results are as follows : (1) The optimum NO/NH3 ratio is about 1 to maximize NH3 decomposition and NO reduction. (2) The NH3 decomposition ratio depends only on H2, and decreases rapidly with increasing H2 concentration. (3) The NO reduction ratio decreases with increasing H2 concentration. (4) This method is effective for decreasing TFN by up to 60% minimizing the total concentration of remaining NH3 and NO in air-blown coal-gasified fuel.

KW - Ammonia

KW - Chemical Reaction

KW - Coal Gasification

KW - Kinetics

KW - Nitrogen Oxides

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Study of Ammonia Removal from Coal-Gasified Fuel

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Keywords

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