Leachate back-injection system of garbage incineration boiler and method for reducing NOx content

A technology for waste incineration and leachate, which is applied in separation methods, chemical instruments and methods, and nitrous oxide capture, etc., can solve the problems of inability to process leachate, excessive NOx content, and large environmental pollution. Stabilizing, reducing NOx emissions, and cleaning flue gas emissions

Pending Publication Date: 2018-12-28
北京高安屯垃圾焚烧有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But there are the following disadvantages: the flue gas contains more NOx, if it is not treated effectively, it will pollute the environment when it is discharged into the air
The invention preheats and combusts municipal waste to effectively remove SO in the flue gas 2 , nitrogen oxides, dioxins, furans, smoke particles and other harmful emissions, but there are the following deficiencies: the control of nitrogen oxide emissions generally adopts the SNCR method or adds an SCR system, which is costly and cannot be used for leachate in garbage. deal with
But there is following deficiency in the present invention application: because the NOx concentration that produces when rubbish is burned is different because of the change of combustion composition, and the amount that leachate is ejected is constant, when NOx concentration is higher, the ammonia nitrogen composition that contains in the leachate cannot If the purification of NOx is satisfied, the NOx content in the discharged gas will exceed the standard, which will cause great environmental pollution

Method used

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  • Leachate back-injection system of garbage incineration boiler and method for reducing NOx content
  • Leachate back-injection system of garbage incineration boiler and method for reducing NOx content
  • Leachate back-injection system of garbage incineration boiler and method for reducing NOx content

Examples

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Effect test

Embodiment 1

[0057] Embodiment 1: A kind of waste incineration boiler leachate return spraying system, such as figure 1 with figure 2 As shown, it includes a urea injection device and a leachate return spray device. The urea injection device includes a urea spray gun installed on the waste incineration boiler. The leachate return spray device includes a leachate spray gun installed on the waste incineration boiler. The leachate The spray gun is connected to the external source of compressed air and leachate through pipelines. Control valves and flow meters are respectively installed on the pipelines. The ammonia nitrogen in the urea and leachate and the NOx produced by waste incineration undergo denitrification reactions during the combustion process, reducing NOx content in exhaust gas.

[0058] refer to figure 1 with figure 2 , There are multiple main pipelines for compressed air, so that other users can also use compressed air.

[0059] The urea injection device also includes a ur...

Embodiment 2

[0084] Embodiment 2: A kind of waste incineration boiler leachate return spraying system, such as Figure 11 As shown, the difference from Embodiment 1 is that an air storage tank is connected to the main compressed air pipeline, and a leachate sewage discharge pipe is installed at the bottom of the air storage tank, and a control valve is installed on the sewage discharge pipe.

[0085] Compared with Embodiment 1, the advantages are: 1) Adding a compressed air storage tank to supply air separately for the leachate back spraying device can ensure that the pressure of the compressed air is relatively stable, and avoid the pressure of the compressed air due to the large number of users of the main compressed air pipeline. The pressure changes greatly, and the atomization effect is unstable;

[0086] 2) Even if the atomizing nozzle 4 is blocked, the leachate can only flow into the air storage tank along the pipeline, and it can also prevent the leachate from entering the compress...

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Abstract

The invention discloses a leachate back-injection system of a garbage incineration boiler and a method for reducing NOx content, and relates to the technical field of garbage treatment. The technicalscheme of the system is characterized by comprising a leachate back-injection device and an ammonia supplementing system, wherein the leachate back-injection device comprises a leachate spray gun mounted on a hearth; the ammonia supplement system comprises a central controller, a NOx content detection module, an ammonia nitrogen content detection module, an output control module and an NH3 supplement module. The problem of insufficient denitration caused by the fixed amount of sprayed leachate due to the change of NOx concentration of garbage incinerated by the garbage incineration boiler is solved, atomization stability is improved by improving the leachate injection manner, the leachate is supplemented with ammonia as required, the removal effect of NOx from garbage incineration is enhanced, and the content of NOx in exhaust gas is reduced.

Description

technical field [0001] The invention relates to the technical field of garbage treatment, more specifically, it relates to a leachate respray system of a garbage incineration boiler and a method for reducing the NOx content. Background technique [0002] With the development of society, people's quality of life is getting better and better, followed by a large amount of domestic waste. At present, there are two commonly used waste disposal methods: one is to use landfill technology, however, With the gradual reduction of urban land, people are also looking for alternatives to landfill technology; another way is to incinerate domestic waste, using domestic waste to incinerate in boilers, which has the advantages of reduction, resource utilization and harmlessness , the generated steam can be used for power generation and steam supply, which has the social benefits of saving energy and reducing environmental pollution, as well as good economic benefits. [0003] The authorize...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/79B01D53/56
CPCB01D53/56B01D53/79B01D2251/2062Y02C20/10
Inventor 邓卫星高峰高丙寅
Owner 北京高安屯垃圾焚烧有限公司
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