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Alkali Recovery Boiler Low Temperature Denitrification System and Process

An alkali recovery boiler, low temperature denitration technology, applied in heat exchangers, lighting and heating equipment, indirect heat exchangers, etc., can solve problems such as increased investment costs, excessive NOx emissions, and no reserved space for denitration in boilers, achieving catalytic The effect of sufficient denitration reaction and improved NOx removal efficiency

Active Publication Date: 2018-06-19
武汉凯比思电力设备有限公司
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Problems solved by technology

[0004] Conventional SCR denitrification is arranged between the outlet of the pulverized coal boiler economizer and the inlet of the air preheater, and the flue gas is introduced into the SCR reactor through the flue, and the treated flue gas is introduced into the air through the flue after denitration treatment The preheater and SCR reactor cannot be arranged too far away, otherwise too long a flue will lead to an increase in investment costs. In addition, the heat loss during long-distance transportation will be greater, and the temperature may be lower than the operating temperature of the SCR catalyst, thereby reducing the catalyst efficiency and causing Excessive NOx emissions
The boiler tail structure is generally relatively compact, especially the early boilers did not reserve denitrification space, and it may not be possible to arrange enough SCR reactors

Method used

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  • Alkali Recovery Boiler Low Temperature Denitrification System and Process
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  • Alkali Recovery Boiler Low Temperature Denitrification System and Process

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[0029] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0030] In the following text, many aspects of the invention will be better understood with reference to the accompanying drawings. Components in the figures are not necessarily drawn to scale. Instead, emphasis is placed on clearly illustrating the components of the invention. Furthermore, like reference numerals indicate corresponding parts throughout the several views of the drawings.

[0031] As used herein, the word "exemplary" or "illustrative" means serving as an example, instance, or illustration. Any implementation described herein as "exemplary" or "illustrative" is not necessa...

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Abstract

The invention relates to the technical field of alkali recovery boiler flue gas treatment, in particular to an alkali recovery boiler low-temperature denitration system and process.The system comprises an alkali recovery boiler, a heater, an electrostatic dust collection device, a low-temperature denitration device, a waste heat recovery device and a water feeding and storing device.The heater is arranged to heat water provided for the alkali recovery boiler so as to increase the temperature of flue gas to be close to catalytic reaction temperature, so that catalysis denitration reaction is more sufficient and NOx removal efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of flue gas treatment of an alkali recovery boiler, in particular to a low-temperature denitrification system and process for an alkali recovery boiler. Background technique [0002] With the rapid development of social economy, environmental problems have become increasingly prominent. Sulfur oxides and nitrogen oxides are the main air pollutants, which seriously endanger the ecological environment and people's health. Especially in recent years, there have been severe smog weather all over the country, which has affected our daily life. Power plants have always been the main emitters of air pollution. The country has also formulated detailed emission standards for power plants. The current emission requirements for thermal power plants are SO 2 ≤100mg / Nm 3 , NOx≤100mg / Nm 3 , Dust≤30mg / Nm 3 . At present, the mature conventional SCR catalysts on the market have an operating temperature of 320 ° C ~ 400 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/86B01D53/56F28D21/00
CPCB01D53/8631F28D21/0014
Inventor 贺黎明高川舒欢
Owner 武汉凯比思电力设备有限公司
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