Comparison of Characteristics of SCR-DeNOx Catalyst for Gas-Turbine Units and Coal-Fired Units
Based on the comparison between gas-turbine units and coal-fired units in terms of the NOx emission policy requirements and the characteristics of catalysts in SCR process, this paper expounds the importance of SCR-DeNOx application in gas turbine units and analyses the difference in the features of...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
State Grid Energy Research Institute
2021-06-01
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| Series: | Zhongguo dianli |
| Subjects: | |
| Online Access: | https://www.electricpower.com.cn/CN/10.11930/j.issn.1004-9649.202011126 |
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| Summary: | Based on the comparison between gas-turbine units and coal-fired units in terms of the NOx emission policy requirements and the characteristics of catalysts in SCR process, this paper expounds the importance of SCR-DeNOx application in gas turbine units and analyses the difference in the features of SCR-DeNOx catalyst, such as layout, structure, composition and DeNOx efficiency. The study results show that due to the low flue gas temperature, high baseline oxygen content, low NOx, SO2 and dust contents in the inlet flue gas, the catalysts are generally arranged in the waste heat boiler after the medium pressure evaporator in the gas turbine units with the designed DeNOx efficiency between 30% and 70%, suitable for the implementation of loose ammonia escape control strategies. Their pore quantities per unit are generally higher than 40×40 and shorter than 350 mm. The contents of active components (V2O5) and promoter components (WO3) are significantly higher than that of coal-fired flue gas DeNOx catalysts. Moreover, due to the slow decay rate of chemical deactivation and mechanical damage of the catalysts in gas turbine SCR process, a longer service life is expected for the catalysts. At last, the detection methods for the catalyst of gas turbine SCR process shall be different from the traditional methods for the catalyst in coal-fired unit SCR process under current standards. |
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| ISSN: | 1004-9649 |