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Organic waste liquid graded denitration device and method

A technology for organic waste liquid and denitrification, which is applied in separation methods, combustion methods, chemical instruments and methods, etc., can solve the problems that the advantages of low nitrogen are not maximized, reduce the denitration efficiency of organic waste liquids, etc., and reduce purification and operation costs. , High denitration efficiency, the effect of avoiding system blockage

Active Publication Date: 2021-08-17
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Patent 112097264A discloses a low-nitrogen emission graded incineration process for hazardous waste. The method is to gasify organic waste liquid with air in a fluidized bed, and the formed reducing components and solid waste incineration flue gas enter the secondary combustion chamber for combustion, wherein Reburning of reducing components can reduce incineration flue gas NOx to N 2 , however due to noncondensable reducing gases (such as H 2 , CO) denitrification capacity is much lower than that of tar, and the low nitrogen advantage of this system has not been maximized
In addition, the reburning of tar and reducing gas is based on one-step denitrification, which leads to the consumption of a considerable amount of reducing components through combustion, which reduces the denitrification efficiency per unit mass of organic waste liquid.

Method used

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  • Organic waste liquid graded denitration device and method
  • Organic waste liquid graded denitration device and method
  • Organic waste liquid graded denitration device and method

Examples

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Embodiment 1

[0040] This example is a case of two-step denitrification of low-salt or no-salt organic waste liquid. The denitrification device is as follows figure 2 As shown, according to the hazardous waste low-nitrogen emission graded incineration process of the embodiment of the present invention, the present invention provides a graded denitrification device for organic waste liquid, including a solid waste incineration device, a primary denitrification device, a secondary denitrification device, waste heat recovery system, flue gas purification system. The solid waste incineration device is provided with a solid waste feeding port, an air supply port and a flue gas inlet; the first-stage denitration device is provided with a waste liquid spray gun, a flue gas inlet and a reducing gas outlet; There are vents. The flue gas outlet of the rotary kiln is connected with the flue gas inlet of the primary denitration device, and the reducing gas outlet of the primary denitrification device...

Embodiment 2

[0060] This example is a case of two-step denitrification of high-salt organic waste liquid. The denitrification device is as follows image 3 shown. In this case, the primary denitrification device is divided into two parts, with a flue gas inlet and a slag discharge port at the bottom, where the flue gas inlet is connected to the flue gas outlet of the solid waste incineration device. By setting the internal dimensions of the lower region, the gas flow rate in this region is lower than the free settling velocity of the salt particles contained in the waste liquid. The temperature in the lower area should be lower than the melting temperature of the salt ash contained in the waste liquid. The salt contained in chemical waste liquid is usually represented by NaCl, KCl, Na 2 CO 3 Mainly, the temperature in this region is usually below 800 °C (NaCl salt melting temperature). Control the oxygen content at the outlet of the solid waste incineration flue gas, preferably below 2...

Embodiment 3

[0065] This implementation is a case of treating high-salt and low-salt / salt-free organic waste liquid at the same time. For the denitrification device, see Figure 4 . In this embodiment, the high-salt organic waste liquid is sprayed from the lower area to perform denitrification, thermal cracking and desalination. The temperature in this area should be lower than the temperature corresponding to the melting of the contained inorganic component salts.

[0066] Low-salt / salt-free organic waste liquid is fed from the upper area for denitrification and thermal cracking, and the temperature in this area should be maintained above 850°C.

[0067] All the other steps are similar to Example 2.

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Abstract

The invention relates to a flue gas denitration device and a flue gas denitration method, and discloses an organic waste liquid graded denitration device and method. The device comprises a solid waste incineration device, a primary denitration device, a secondary denitration device, a waste heat recovery system and a flue gas purification system. In the process, flue gas and organic waste liquid generated by solid waste incineration enter a first-stage denitration device, NOx in the flue gas generated by solid waste incineration is directly reduced into N2 by part of the organic waste liquid under the oxygen-deficient condition, and the rest unreacted organic waste liquid is cracked into micromolecular tar and reducing gas; and the small molecular tar and the reducing gas enter a second-stage denitration device for high-temperature complete combustion, and meanwhile, NOx in the flue gas can be further reduced. Through the technical scheme of the invention, the organic waste liquid can be used as a reducing agent of NOx, and the denitration capability is maximized through two-step denitration, so that the method has outstanding environmental and economic benefits.

Description

technical field [0001] The invention relates to a flue gas denitrification device and a method thereof, in particular to an organic waste liquid graded denitrification device and a method thereof. Background technique [0002] At present, the main disposal method of hazardous waste is high-temperature incineration. Generally, the structure of "rotary kiln incinerator + secondary combustion chamber" is adopted, and it is converted into high-temperature flue gas and ash when it reaches the outlet of the rotary kiln incinerator. The high-temperature flue gas enters the secondary combustion chamber and is further completely burned under the action of excess air to ensure that trace organic matter and dioxins are fully decomposed at high temperature. As environmental protection becomes increasingly stringent, hazardous waste incineration flue gas must be purified by desulfurization and denitrification before it can meet the emission standards. At present, the denitrification tec...

Claims

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Application Information

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IPC IPC(8): B01D53/56B01D53/75B01D53/79F23G7/06F23G5/46F23J15/00
CPCB01D53/56B01D53/75B01D53/79F23G7/06F23G5/46F23J15/003B01D2258/0283B01D2251/20
Inventor 贾鑫许光文韩振南宋兴飞付亮亮刘雪景
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY