Method and apparatus for combined removing sulfur-dioxide and nitrogenoxide by mixed solution

A technology of mixed solution and sulfur dioxide, which is applied in the desulfurization and denitrification device, flue gas simultaneous desulfurization and denitrification field, can solve the problems of high energy loss, corrosion in the furnace, etc., and achieve the effect of high overall efficiency, low operating cost and no secondary pollution

Inactive Publication Date: 2007-11-21
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese invention patent (application number: 91105599.1) is used in the high-temperature section of the furnace, which will inevitably bring about high energy loss and corrosion in the furnace.

Method used

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  • Method and apparatus for combined removing sulfur-dioxide and nitrogenoxide by mixed solution
  • Method and apparatus for combined removing sulfur-dioxide and nitrogenoxide by mixed solution
  • Method and apparatus for combined removing sulfur-dioxide and nitrogenoxide by mixed solution

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Embodiment 1

[0059] Referring to Fig. 1, an embodiment of the method for the joint removal of sulfur dioxide and nitrogen oxides in flue gas by urea / ammonia / additive solution of the present invention will be described in detail.

[0060] Contains sulfur dioxide 600mg / Nm 3 ~6000mg / Nm 3 and nitrogen oxides 400mg / Nm 3 ~3000mg / Nm 3 After the flue gas is dedusted at about 160°C, it enters the heat exchanger 1 through the pipeline and cools down to 100-110°C, and then enters the main body of the primary reactor; the flue gas first passes through the primary gas distributor 2 and enters the primary absorption reactor 3 and Blended with additives such as triethanolamine or ethylenediamine, the additives are added to the urea / ammonia mixed solution with a mass percentage of 0.005% to 0.025% of the urea / ammonia solution. The concentration of the primary ammonia solution is 2% to 10% and the concentration of the urea solution is 2%. ~6% are in gas-liquid mixed contact, most of the SO 2 Absorbed a...

Embodiment 2

[0061] Embodiment 2: The method for combined removal of sulfur dioxide and nitrogen oxides by the mixed solution disclosed by the present invention is as follows:

[0062] Step 1: Cool the flue gas after dedusting to 100°C to 110°C, then make the flue gas contact with the urea / ammonia water mixed solution mixed with additives, and the liquid-gas ratio of the mixed solution to the flue gas is 1.5 ~4L / m 3 , the concentration of ammonia water in the mixed solution is 2% to 10%, the concentration of urea in the mixed solution is 2% to 6%, the mixed solution is used as a primary absorption solution and its pH value is maintained at 5 to 7, and the temperature is controlled at 30℃~60℃, SO in flue gas 2 and NO x Absorbed, compressed air is blown into the solution after contacting with flue gas and reacting to oxidize ammonium sulfite to ammonium sulfate, and the addition amount of the above additives is 0.005% to 0.025% by mass of the urea / ammonia solution;

[0063]The second step...

Embodiment 3

[0066] Embodiment 3: A kind of device that is used to implement described mixed solution joint removal sulfur dioxide and nitrogen oxide method is to be made up of heat exchanger 1, primary gas distributor 2, primary absorption reactor 3, primary mist eliminator 4. Secondary gas distributor 5, Secondary absorption reactor 6, Secondary demister 7, Secondary circulation pump 10, Secondary liquid collection tank 11, Pump 12, Centrifuge 13, Primary liquid collection tank 15, Separation liquid pump 16, air compressor 17, primary circulation pump 18, primary gas distributor 2 is arranged in primary absorption reactor 3, secondary gas distributor 5 is arranged in secondary absorption reactor 6, heat The flue gas outlet of the exchanger 1 is connected to the flue gas inlet 21 of the primary absorption reactor, the flue gas outlet of the primary absorption reactor 3 is connected to the flue gas inlet of the secondary absorption reactor 6, and the primary mist eliminator 4 is located be...

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Abstract

The invention is concerned with a method to remove sulfur dioxide and compounds of nitrogen and oxygen by using a kind of mixed solution. Drop the temperature of gas after moving dust to 100 to 110 degree, and contact with carbamide / ammonia mixed solution with additive to absorb sulfur dioxide and compounds of nitrogen and oxygen, then blow compressed air into the solution to get ammonia sulfate. Remove the solution and make gas contact with carbamide solution with additive, then let out after reaction. It can adopt double level spray or column reactor to coupling the first and second reactors into a same container and separate double lever reactor with clapboard, this predigests the connecting structure of double lever reactor and reduce the height of cleaning equipment and heat lost.

Description

technical field [0001] The invention belongs to the technical field of atmospheric environmental protection, and relates to a method and a desulfurization and denitrification device for simultaneous flue gas desulfurization and denitrification, in particular to a method and device for jointly removing sulfur dioxide and nitrogen oxides by using a urea / ammonia water / additive mixed solution. technical background [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 man...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/60B01D53/78
CPCY02A50/20
Inventor 熊源泉陆静雅高鸣姚志彪
Owner SOUTHEAST UNIV
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