Device and process for removing NOx by hyper-gravity with high efficiency

A technology of supergravity and removal, applied in the direction of separation method, dispersion particle separation, chemical instruments and methods, etc., can solve the problems of high energy consumption, low efficiency, unstable outlet concentration, etc., achieve continuous operation stability, simple process, low cost effect

Inactive Publication Date: 2014-01-22
BEIJING UNIV OF CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Hypergravity technology has great advantages in enhancing mass transfer and micro-mixing, and its application to NO x The removal process can effectively solve the problems of low efficiency, unstable outlet concentration, high energy consumption, and low utilization rate of the absorption liquid in the original tower process.
However, the above-mentioned problems also exist when using supergravity denitrification, NO 2 When the molar ratio to NO is low, NO can not be achieved x effective removal of

Method used

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  • Device and process for removing NOx by hyper-gravity with high efficiency
  • Device and process for removing NOx by hyper-gravity with high efficiency

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A high-efficiency removal of NO by supergravity x The device comprises high-gravity gas conditioner 10, nitric acid circulation tank 20, high-gravity lye absorber 30, mist eliminator 40 and lye tank 50;

[0036] The outlet of the nitric acid circulation tank 20 is connected to the first circulation pump 71 inlet by the first pipeline 61, and the outlet of the first circulation pump 71 is connected to the liquid inlet of the high gravity gas conditioner 10 by the second pipeline 62; The liquid outlet of the high-gravity gas conditioner 10 is connected to the nitric acid circulation tank 20 through the third pipeline 63; the gas inlet of the high-gravity gas conditioner 10 is externally connected to transport nitric acid gas or NO x industrial tail gas pipeline 81;

[0037] The gas outlet of the high-gravity gas conditioner 10 is connected to the gas inlet of the high-gravity lye absorber 30 through the fourth pipeline 64, and the gas outlet of the high-gravity lye absor...

Embodiment 2

[0058] A kind of utilizing above-mentioned device to remove NO x process, the parameter conditions are as follows:

[0059] Exhaust gas volume 30000Nm 3 / h, NOx content 3000ppm, normal temperature, pressure 0.126MPa, (of which NO accounts for 70%, NO 2 accounted for 30%), super gravity level 100g, sodium carbonate content 15% (w / w), nitric acid circulation volume 30m 3 / h, alkali suction circulation is 40m 3 / h. NO after conditioning 2 / NO is 1.1:1, after the tail gas is absorbed by lye, NO x The content is less than 200ppm.

Embodiment 3

[0061] A kind of technology that utilizes above-mentioned device to remove NOx, parameter condition is as follows:

[0062] Exhaust gas volume 10000Nm 3 / h, the temperature is normal temperature, the pressure is 0.12Mpa, and the supergravity NOx content is 2000ppm (of which the NO content is 60%, the NO 2 content 40%), supergravity level 200g, sodium carbonate content 15% (w / w), nitric acid circulation volume 10m 3 / h, alkali suction circulation is 20m 3 / h,. NO after conditioning 2 / NO is 1.3:1, and the NOx content of tail gas is less than 100ppm after being absorbed by lye.

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Abstract

The invention discloses a device for removing NOx by hyper-gravity with high efficiency. The device comprises a hyper-gravity gas conditioner, a nitric acid circulating tank, a hyper-gravity lye absorber, a demister and a lye tank, wherein the nitric acid circulating tank is connected to a first circulating pump through a first pipe, and the first circulating pump is connected and communicated with the hyper-gravity gas conditioner through a second pipe; the hyper-gravity gas conditioner is connected to the nitric acid circulating tank through a third pipe; the hyper-gravity gas conditioner is externally connected with an pipe for conveying industrial exhaust which contains nitric acid gas or NOx; the hyper-gravity gas conditioner is connected to the hyper-gravity lye absorber through a fourth pipe; the hyper-gravity lye absorber is connected to the demister through a fifth pipe; the demister is connected to the lye tank through a sixth pipe; the lye tank is connected to a second circulating pump through a seventh pipe; a liquid outlet pipe is arranged on an eighth pipe. The device for removing NOx by hyper-gravity with high efficiency has the beneficial effects that the process flow is simple, the NOx removing efficiency can reach over 93%, continuous operation is stable, and the cost is low.

Description

technical field [0001] The invention relates to a method for removing NO x device and process, especially related to a high-efficiency removal of NO by supergravity x devices and processes. Background technique [0002] Nitrogen oxides (NO x ) mainly refers to NO 2 and NO mixture. In industrial production of nitric acid, ammonia is generally oxidized to NO x After absorption with water or dilute acid in the system. Due to the process and chemical reaction characteristics, NO x It cannot be completely absorbed in the nitric acid absorption tower, and there is always a certain concentration of NO in the exhaust gas x , its concentration is generally 1500-5000mg / m 3 , far exceeding the national regulation of 170mg / m 3 . [0003] There are many gas treatment methods in the production process of dilute nitric acid, and there are mainly three kinds that can be applied in industry: chemical absorption method, pressure swing adsorption method and catalytic reduction method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/56
Inventor 陈建峰孙宝昌赵宏初广文罗勇邹海魁
Owner BEIJING UNIV OF CHEM TECH
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