Four-tower normal-temperature nitrogen oxide removal process and four-tower normal-temperature nitrogen oxide removal device

A technology for removing nitrogen oxides, applied in chemical instruments and methods, dispersed particle separation, separation methods, etc., can solve the problems of high operating costs and low effective utilization of chemicals, reduce travel factors and increase effective utilization , the effect of preventing pipe clogging

Pending Publication Date: 2021-08-06
四川省创飞格环保技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In order to solve the problem of high operating cost due to the low effective utilization rate of chemicals in the existing workshop tail gas treatment process, a four-tower normal temperature nitrogen oxide removal process and device are provided.

Method used

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  • Four-tower normal-temperature nitrogen oxide removal process and four-tower normal-temperature nitrogen oxide removal device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] As one of the preferred implementations, each component and parameters in the process are implemented as follows:

[0071] Intake components:

[0072] Intake volume is 3000Nm 3 / h, NO concentration is 285mg / m 3 , NO 2 The concentration is 108mg / m 3 ;

[0073] In the primary oxidation tower:

[0074] The pH value is 3.2, the oxidant concentration is 0.435%, and the temperature is 32.5°C, wherein the oxidant is sodium chlorite;

[0075] In the deep oxidation tower:

[0076] The pH value is 4.3, the oxidant concentration is 3.54%, and the temperature is 35.6°C, wherein the oxidant is sodium chlorite;

[0077] In the primary reduction tower:

[0078] The pH value is 11.6, the reducing agent concentration is 0.23%, and the temperature is 34.3°C;

[0079] In the deep reduction tower:

[0080] The pH value is 12.6, the reducing agent concentration is 2.56%, and the temperature is 35.9°C;

[0081] Outgassing components:

[0082] NO concentration is 1.34mg / m 3 , NO ...

Embodiment 2

[0084] As one of the preferred implementations, each component and parameters in the process are implemented as follows:

[0085] Intake components:

[0086] Intake volume is 5000Nm 3 / h, NO concentration is 155mg / m 3 , NO 2 The concentration is 80mg / m 3 ;

[0087] In the primary oxidation tower:

[0088] The pH value is 3.4, the oxidant concentration is 0.342%, and the temperature is 35.7°C, wherein the oxidant is sodium chlorite;

[0089] In the deep oxidation tower:

[0090] The pH value is 4.5, the oxidant concentration is 2.78%, and the temperature is 38.6°C, wherein the oxidant is sodium chlorite;

[0091] In the primary reduction tower:

[0092] The pH value is 11.7, the reducing agent concentration is 0.34%, and the temperature is 36.7°C;

[0093] In the deep reduction tower:

[0094] The pH value is 12.8, the reducing agent concentration is 2.36%, and the temperature is 37.7°C;

[0095] Outgassing components:

[0096] NO concentration is 1.17mg / m 3 , NO ...

Embodiment 3

[0098] As one of the preferred implementations, each component and parameters in the process are implemented as follows:

[0099] Intake components:

[0100] Intake volume is 8000Nm 3 / h, NO concentration is 320mg / m 3 , NO 2 The concentration is 126mg / m 3 ;

[0101] In the primary oxidation tower:

[0102] The pH value is 3.1, the oxidant concentration is 0.503%, and the temperature is 39.6°C, wherein the oxidant is sodium chlorite;

[0103] In the deep oxidation tower:

[0104] The pH value is 4.3, the oxidant concentration is 4.01%, and the temperature is 42.4°C, wherein the oxidant is sodium chlorite;

[0105] In the primary reduction tower:

[0106] The pH value is 11.3, the reducing agent concentration is 0.17%, and the temperature is 40.1°C;

[0107] In the deep reduction tower:

[0108] The pH value is 12.2, the reducing agent concentration is 1.87%, and the temperature is 41.5°C;

[0109] Outgassing components:

[0110] NO concentration is 3.23mg / m 3 , NO ...

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Abstract

The invention discloses a four-tower normal-temperature nitrogen oxide removal process and a four-tower normal-temperature nitrogen oxide removal device, belongs to the technical field of tail gas treatment, and solves the problem of high operation cost caused by low effective utilization rate of chemicals in an existing workshop tail gas treatment process. The four-tower normal-temperature nitrogen oxide removal device comprises a primary oxidation tower; an inlet of the primary oxidation tower is connected with a tail gas passing pipe; the primary oxidation tower is further connected with a deep oxidation tower, the deep oxidation tower is connected with an oxidizing agent adding valve, the deep oxidation tower is connected with a primary reduction tower, the primary reduction tower is connected with a deep reduction tower, and the deep reduction tower is connected with a reducing agent adding valve and a liquid caustic soda adding valve. And the bottoms of the primary oxidation tower and the primary reduction tower are connected with a comprehensive regulation tank through discharge valves. According to the invention, the absorption, oxidation and reduction of the chemical reaction are accurately controlled, and the economic cost is maximally controlled.

Description

technical field [0001] The invention belongs to the technical field of tail gas treatment, and in particular relates to a process and a device for removing nitrogen oxides at normal temperature with four towers. Background technique [0002] The waste gas generated during the production process of the workshop mainly includes: acid waste gas, diffusion waste gas, coating waste gas, and organic waste gas. The content of this analysis is mainly acid waste gas. Its main pollutants are fluoride, hydrogen chloride, sulfuric acid mist, nitrogen oxides, and chlorine. [0003] The existing treatment process adopts the absorption method, that is, the multi-stage purification treatment of the spray-painted packed tower is used to treat the pollutants in the acid waste gas to meet the discharge requirements for organized discharge. [0004] The existing processing technology has the following problems: [0005] (1) The cost of pharmaceutical operation is high; [0006] (2) The dosin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/56B01D53/75B01D53/78B01D53/30
CPCB01D53/30B01D53/56B01D53/75B01D53/78B01D2251/108B01D2251/304
Inventor 陈天洪周瑞健叶易春朱亮肖明
Owner 四川省创飞格环保技术有限公司
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