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Low-nitrogen oxide incineration technology and device

A technology with low nitrogen oxides and nitrogen oxides, applied in incinerators, combustion methods, combustion types, etc., can solve the problems of large equipment investment, high energy consumption, and high operating costs, saving energy consumption and increasing contact reaction time. , the effect of reducing the generation of harmful gases

Active Publication Date: 2018-11-13
杭州国泰环保科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the flue gas denitration process is a flue gas purification process with large equipment investment, high energy consumption, and high operating costs.

Method used

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  • Low-nitrogen oxide incineration technology and device

Examples

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no. 1 example

[0027] The low nitrogen oxide incineration process includes a mixing step, a limestone powder decomposition step, an ammonia gas generation step and a nitrogen oxide reduction step.

[0028] Mixing step: add the dehydrated dry mud to the mixer 9 from the first inlet 11, add the coal to the mixer 9 from the second inlet 12, add the recovered ammonium sulfate to the mixer 9 from the third inlet 13, and add the recovered ammonium sulfate to the mixer 9 from the second inlet 12. The fourth inlet 5 feeds limestone powder to the mixer 9 . Recovery of ammonium sulfate is the recovery of ammonium sulfate obtained from the treatment of high-concentration ammonium sulfate wastewater produced in the processes of ammonia desulfurization, ammonium hydrogen phosphate method to caprolactam and three-stage ammonia suction method to recover sulfuric acid tail gas. In this example, activated carbon is first added to the wastewater containing high concentration of ammonium sulfate to remove inso...

no. 2 example

[0039] The shape and structure of the low nitrogen oxide incineration device in the second embodiment are the same as those in the first embodiment, most of the steps in the low nitrogen oxide incineration process in the second embodiment The oxide incineration process is the same, and the same components use the same labels, which will not be repeated here. Only the differences are described below.

[0040] The reaction temperature range of the limestone powder decomposition step is 900°C. The amount of limestone powder added ensures that the molar ratio of calcium to sulfur is in the range of 2:1. The flue gas is controlled by controlling the input speed of limestone powder, the mixing material and the exhaust gas. The contact reaction time with ammonia gas is 5s.

no. 3 example

[0042] The low nitrogen oxide incineration device in the third embodiment has the same shape and structure as that in the first embodiment, and most of the steps in the low nitrogen oxide incineration process in the third embodiment are the same as those in the first embodiment. The oxide incineration process is the same, and the same components use the same labels, which will not be repeated here. Only the differences are described below.

[0043] The reaction temperature range of the limestone powder decomposition step is 900°C. The amount of limestone powder added ensures that the molar ratio of calcium to sulfur is in the range of 2:1. The flue gas is controlled by controlling the input speed of limestone powder, the mixing material and the exhaust gas. The contact reaction time with ammonia gas is 6s.

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Abstract

The invention provides a low-nitrogen oxide incineration technology and device. The low-nitrogen oxide incineration technology and device are used for incineration disposal of dehydrated dry mud. Thelow-nitrogen oxide incineration technology comprises the steps that materials are mixed, specifically, the dehydrated dry mud, coal, recovered ammonium sulfate and limestone powder are put into a mixer, the recovered ammonium sulfate is prepared from waste liquid containing ammonium sulfate, the dehydrated dry mud, the coal, the limestone powder and the recovered ammonium sulfate are mixed for 0.1-1 hour, and thus a mixture is obtained; the limestone powder is decomposed, specifically, the limestone powder is incinerated to be decomposed into calcium oxide and carbon dioxide; ammonia is generated, specifically, the mixture is put from a mixture inlet into an incinerator, and the ammonium sulfate and the calcium oxide in the mixture react to generate the ammonia and calcium sulfate; and nitrogen oxide is reduced, specifically, flue gas is generated by incineration of the dehydrated dry mud and rises from bottom to up, the flue gas and the ammonia make contact to be mixed, the flue gas includes the nitrogen oxide, the ammonia and the nitrogen oxide are subjected to redox reaction, the nitrogen oxide is reduced to generate nitrogen, and the nitrogen and the carbon dioxide generated inthe limestone powder decomposition step are exhausted from a flue gas outlet of the incinerator.

Description

technical field [0001] The invention relates to the technical field of environmental protection and emission reduction related to sludge disposal, in particular to a low-nitrogen oxide incineration process and a device thereof. Background technique [0002] Ammonia desulfurization is a high-efficiency, low-energy wet desulfurization method. The desulfurization process is a gas-liquid phase reaction with a fast reaction rate and a high utilization rate of the absorbent, which can maintain a desulfurization efficiency of 95% to 99%. But this technique can produce a large amount of waste water containing high-concentration ammonium sulfate, and its main component is ammonium sulfate (ammonium sulfate mass concentration can reach 85% and more than, and its effective ammonia mass concentration is more than 22%), also contains a small amount of ammonium sulfite Other ammonium salts and a small amount of free ammonia. In addition, ammonium hydrogen phosphate method to produce capr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23G5/04F23G5/44F23J15/04
CPCF23G5/04F23G5/44F23J15/04
Inventor 陈柏校何小瑜王成陈鑫波夏玉坤
Owner 杭州国泰环保科技股份有限公司
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