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Double-process combined denitration interlocking control system for tail gas treatment of waste incineration plant

A technology for waste incineration and exhaust gas treatment, which is applied in general control systems, control/regulation systems, electrical program control, etc., and can solve problems such as frequent start and stop of SCR

Pending Publication Date: 2020-04-17
SHANGHAI SUS ENVIRONMENT
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Problems solved by technology

[0005] The dual-process denitrification of SNCR and SCR can ensure the denitrification efficiency, and at the same time take into account the investment and operation costs, but it must be solved that when the SNCR and SCR systems are running at the same time, due to the boiler load and the nature of the garbage, the flue gas after SNCR denitrification has met the discharge requirements. The problem of frequent start and stop of SCR caused by the requirement

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  • Double-process combined denitration interlocking control system for tail gas treatment of waste incineration plant
  • Double-process combined denitration interlocking control system for tail gas treatment of waste incineration plant
  • Double-process combined denitration interlocking control system for tail gas treatment of waste incineration plant

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[0035] Below in conjunction with accompanying drawing, content of the present invention is described further:

[0036] Such as figure 1 Shown is a dual-process automatic combined denitrification (SNCR+SCR) system diagram, which generally cooperates with other exhaust gas purification processes. The specific configuration is: 1. SNCR system; 2. Semi-dry deacidification system; 3. Activated carbon injection system; 4. Slaked lime injection system; 5. Bag filter system; 6. SCR system; 7. Induced fan system.

[0037] First, the SNCR system 1 atomizes 5% ammonia water through compressed air and sprays it into the boiler furnace for denitrification. The denitrification efficiency is optimized through feed-forward control to ensure the lowest ammonia escape. After coming out of the filter, it enters the semi-dry deacidification tower in the semi-dry deacidification system 2 for deacidification. In the flue of the bag filter entering the bag filter system 5, the activated carbon inje...

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Abstract

The invention discloses a double-process combined denitration interlocking control system for tail gas treatment of a waste incineration plant. Control equipment comprises a NOx Fourier transform infrared analyzer, an NH3 laser spectrum analyzer, medicament storage equipment, medicament conveying equipment, medicament injection equipment and a system control unit. SNCR equipment is arranged on theside of the boiler, and SCR equipment is arranged behind the bag type dust collector. The SNCR equipment sprays atomized ammonia water into a hearth of the boiler, redundant ammonia gas after SNCR denitration reaction enters the SCR system and then participates in catalytic denitration reaction, the SCR system needs to adjust and supplement ammonia water through closed-loop control, and the NOx concentration requirement of tail gas emission and the ammonia escape concentration requirement are met. The SNCR equipment introduces an incineration condition feedforward control mode, and is matchedwith a NOx Fourier transform infrared analyzer arranged at an SCR inlet to calculate the required ammonia water injection amount, so that a large amount of ammonia is prevented from escaping and entering an SCR reactor.

Description

technical field [0001] The invention relates to an intelligent interlocking control system for ultra-low discharge of tail gas denitrification in waste incineration plants. Background technique [0002] Waste incineration can maximize the reduction, harmlessness and recycling of waste, but the flue gas produced by waste incineration contains a large number of environmentally harmful substances, among which the emission of nitrogen oxides is an important indicator for environmental monitoring. With the construction of a large number of waste incineration power plants in China, and limited by the total environmental protection NOx emission requirements, the NOx emission concentration requirements are generally increased to 100mg / Nm 3 In the following, only using the SNCR process as the only means of denitrification can no longer meet the NOx emission requirements, while only using the SCR process as the means of denitrification can meet the NOx emission requirements, but the i...

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Application Information

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IPC IPC(8): G05B19/05
CPCG05B19/054
Inventor 龙吉生劳云枫冯淋淋刘露孙中涛王飞王清印晓彬瞿兆舟白力
Owner SHANGHAI SUS ENVIRONMENT
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