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Method and device for removing sulfur dioxide and nitric oxide by combining dual-shaft clash smoke gas

A technology for sulfur dioxide and nitrogen oxides, applied in chemical instruments and methods, separation methods, air quality improvement, etc., to achieve high comprehensive efficiency, improved uniformity, and wide application range

Inactive Publication Date: 2010-06-23
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is only one utility model patent (ZL 200820042363.1) in China that uses impinging flow technology in the process of alkali desulfurization. The high-efficiency combined flue gas desulfurization and denitrification process realized by catalysis and combined with biaxial collision flow technology is unprecedented

Method used

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  • Method and device for removing sulfur dioxide and nitric oxide by combining dual-shaft clash smoke gas
  • Method and device for removing sulfur dioxide and nitric oxide by combining dual-shaft clash smoke gas
  • Method and device for removing sulfur dioxide and nitric oxide by combining dual-shaft clash smoke gas

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Embodiment 1

[0035] A method for combined removal of sulfur dioxide and nitrogen oxides from flue gas with biaxial collision flow,

[0036] After dedusting the polluted flue gas containing sulfur dioxide and nitrogen oxides, it enters the heat exchanger and cools down to 100 ° C ~ 110 ° C.

[0037] Then the flue gas after dust removal and cooling enters the biaxial colliding flow premixing tube. In the biaxial colliding flow premixing tube, the flue gas is first mixed with the atomized urea / ammonia water mixed with catalytic additives. The mixed solution is pre-mixed with gas and liquid, and the temperature of the absorption liquid is controlled at 30°C-80°C, and the liquid-gas ratio is 1.5-6L / m 3 , the mass concentration of the ammonia solution is 2% to 10%, the mass concentration of the urea solution is 2% to 6%, the pH value of the absorption solution is maintained at 4.8 to 9, and the additive with catalytic effect is potassium bromide, ammonium bromide, Potassium chloride, ammonium c...

Embodiment 2

[0041] A device for implementing the method for the combined removal of sulfur dioxide and nitrogen oxides from flue gas with twin-shaft colliding flow described in Example 1, consisting of a heat exchanger 1, a biaxial colliding flow premixing tube 2, and a colliding flow reactor Main body 4, high-efficiency demister 5, absorption liquid circulation pump 6, liquid collection tank 7, valve 8, centrifuge 9, separation liquid pump 10, ammonia water pump 11, ammonia water distribution tank 12, urea solution pump 13, urea solution distribution Composed of a liquid tank 14 and an air compressor 15, the polluted flue gas outlets of the heat exchanger 1 are respectively connected to the flue gas inlets of the biaxial collision flow premixing pipe 2, and the absorption solution is stored in the liquid collection tank 7 and collected The liquid tank 7 is connected to the lower end of the main body 4 of the colliding flow reactor. The biaxial colliding flow premixing pipe 2 is arranged o...

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Abstract

The invention relates to a method for removing sulfur dioxide and nitric oxide by combining dual-shaft clash smoke gas, comprising the following steps of: dedusting and cooling polluted smoke gas to enter a dual-shaft clash stream premixing pipe, performing gas-liquid premixing with urea / ammonia water mixing solution in the dual-shaft clash stream premixing pipe, controlling the temperature of absorption liquid at 30 to 80 DEG C, accelerating the absorption liquid by smoke gas in the dual-shaft premixing pipe and entering a clash stream reactor body. A device is composed of a heat exchanger, a dual-shaft clash premixing pipe, a clash stream reactor body, an efficient demister, an absorption liquid circulation pump, a liquid collecting tank, a valve, a centrifuge, a separation liquid pump, an ammonia water pump, an ammonia water liquid distributing tank, a urea solution pump, a urea solution distributing tank and an air compressor. The dual-shaft clash stream premixing pipe comprises two pairs of clash stream premixing pipes each of which comprises two premixing pipes arranged in the same direction; the premixing pipe is provided with an absorption liquid atomizing nozzle; and the two pairs of clash stream premixing pipes form orthogonality relation in the same horizontal plane.

Description

technical field [0001] The invention belongs to the technical field of atmospheric environment protection. It relates to a flue gas combined desulfurization and denitrification method and device, in particular to a method and device for flue gas combined desulfurization and denitrification using urea / ammonia water / additive solution biaxial counterflow flue gas. Background technique [0002] Sulfur dioxide and nitrogen oxides are the most influential gaseous pollutants in the air pollutants, which are extremely harmful to the human body, the environment and the ecological system. With the increasingly stringent environmental protection requirements, NO x and SO 2 The issue of emissions is getting more and more attention. Sulfur dioxide and nitrogen oxides are mainly derived from the combustion process of coal, petroleum and other petrochemical fuels, as well as the flue gas emissions from the roasting and smelting of ores. It is difficult to manage due to its characteristi...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/60
CPCY02A50/20
Inventor 熊源泉谢红银
Owner SOUTHEAST UNIV
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