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Control method of using denitration device in thermal power generating unit starting stage before synchronization

A technology for thermal power units and control methods, applied in separation methods, chemical instruments and methods, lighting and heating equipment, etc., can solve the problems of catalyst failure, reduce catalyst activity, increase the risk of air preheater blockage, etc., to reduce emissions The effect of increasing the SCR inlet smoke temperature

Inactive Publication Date: 2018-10-02
HUANENG POWER INT INC
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Problems solved by technology

As an important part of the SCR device, the reactor catalyst is only active in the range of 285-420 ° C. If it leaves this area, the escape rate of the injected ammonia gas will increase, and the air preheater will be blocked by ammonium bisulfate. At the same time, ammonia will react with sulfur trioxide in the flue gas to generate ammonium bisulfate and ammonium sulfate, which will be deposited on the catalyst, further reducing the activity of the catalyst, and even causing irreversible failure of the catalyst

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  • Control method of using denitration device in thermal power generating unit starting stage before synchronization
  • Control method of using denitration device in thermal power generating unit starting stage before synchronization
  • Control method of using denitration device in thermal power generating unit starting stage before synchronization

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[0024] In describing the embodiments of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top ", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and Simplified descriptions, rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention. The attached drawings are schematic diagrams or conceptual diagrams, and the relationship between the thickness and width of each part, as well as the proportional relationship between each part, etc., are not completely consistent with their actual values.

[0025] The p...

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Abstract

The invention provides a control method of using a denitration device in a thermal power generating unit starting stage before synchronization. The coal feeding amount during normal operation of the thermal power generating unit is limited to be a first coal feeding amount, the coal feeding amount of the thermal power generating unit in the starting stage is a second coal feeding amount, the second coal feeding amount is larger than the first coal feeding amount, so that flue gas temperature of a boiler outlet is improved. The method is simple and easy to implement, economical, environment-friendly, safe, and reliable; and on the premises that any new equipment is not added and system improvement is not needed, only the operation of the unit is adjusted, the temperature of the flue gas atan inlet of SCR can be effectively improved, the emission amount of the flue gas nitrogen oxide of a boiler is reduced, and the method is green and environment-friendly.

Description

technical field [0001] The invention belongs to the field of denitrification control systems for large-scale thermal power units, and in particular relates to a control method for using a denitrification device before a thermal power unit starts up and is connected to the grid. Background technique [0002] According to the requirements of the pollutant discharge permit issued by the Shanghai Municipal Environmental Protection Bureau in 2017, at this stage, the thermal power units in the city must operate at a load of more than 40% to ensure that the denitrification system is put into operation. [0003] Due to the high denitrification efficiency and low secondary pollution of selective catalytic reduction (SCR) technology, most of the denitrification devices of thermal power units in my country adopt this technology. As an important part of the SCR device, the reactor catalyst is only active in the range of 285-420 ° C. If it leaves this area, the escape rate of the injecte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22D1/32B01D53/86B01D53/56
CPCF22D1/32B01D53/56B01D53/8631B01D2258/0283
Inventor 张仲毅徐懿斌
Owner HUANENG POWER INT INC
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