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Dry desulfurization agent pretreatment system and pretreatment method

A dry desulfurization and pretreatment technology, applied in separation methods, chemical instruments and methods, solid treatment gas purification, etc., can solve the problems of high operating costs, low temperature of coke oven flue exhaust gas, clogged catalysts, etc., and achieve low cost , less investment, small footprint

Inactive Publication Date: 2015-02-04
ANHUI TONGXING ENVIRONMENTAL PROTECTION ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The exhaust gas temperature of the existing coke oven flue is relatively low, generally around 160-320°C; common denitrification catalysts on the market will generate viscous substances such as ammonium hydrogen sulfate to block the catalyst under low-temperature sulfur-containing conditions. running cost is too high

Method used

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  • Dry desulfurization agent pretreatment system and pretreatment method

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Effect test

Embodiment 1

[0020] Embodiment 1: In conjunction with the accompanying drawings, the dry desulfurization agent pretreatment system includes:

[0021] The sodium bicarbonate storage tank 1, the expansion device 2, the buffer tank 3, the sodium carbonate storage tank 4 and the grinding device 5 connected in sequence are provided with a quantitative valve in the communication pipeline between the sodium bicarbonate storage tank 1 and the expansion device 2, The expansion device 2 is equipped with a heating and roasting device, which can control the heating rate, reaction pressure and other conditions; the communication pipeline between the expansion device 2 and the buffer tank 3 is provided with an instant pressure relief valve, and the buffer tank is connected to the atmosphere. In the specific setting, the sodium bicarbonate storage tank 1, the expansion device 2, the buffer tank 3, the sodium carbonate storage tank 4 and the inner cavity of the grinding device 5 are all provided with side ...

Embodiment 2

[0027] Embodiment 2: adopt same system with embodiment 1, pretreatment method step is:

[0028] Sodium bicarbonate enters the expansion device 2 quantitatively from the sodium bicarbonate storage tank 1, and heats up in the expansion device at a heating rate of 10°C / min. At this time, the decomposition acceleration slope (i.e. decomposition rate / heating rate) is 1.63. When the internal pressure of the device is stable at 0.3MPa and does not change, open the switching valve to release the pressure instantly to form explosive atomized powder and spray it into the buffer tank. The buffer tank is a normal pressure device and communicated with the atmosphere. After entering the grinding system for grinding, it is sprayed into the desulfurization system. After grinding, the powder agglomeration is solved and the specific surface area of ​​the powder is further increased.

Embodiment 3

[0029] Embodiment 3: adopt same system with embodiment 1, pretreatment method step is:

[0030] Sodium bicarbonate enters the expansion device 2 quantitatively from the sodium bicarbonate storage tank 1, and heats up in the expansion device at a heating rate of 20°C / min. At this time, the decomposition acceleration slope (i.e. decomposition rate / heating rate) is 1.73. When the internal pressure of the device is stable at 0.3MPa and does not change, open the switching valve to release the pressure instantly to form explosive atomized powder and spray it into the buffer tank. The buffer tank is a normal pressure device and communicated with the atmosphere. After entering the grinding system for grinding, it is sprayed into the desulfurization system. After grinding, the powder agglomeration is solved and the specific surface area of ​​the powder is further increased.

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Abstract

The invention discloses a dry desulfurization agent pretreatment system, which is provided with a sodium hydrogen carbonate storage tank, an expansion device, a buffer tank, a sodium carbonate storage tank and a grinding device, which are communicated in sequence; a proportional valve is arranged in the communication pipeline of the sodium hydrogen carbonate storage tank and the expansion device, and a heating and roasting device is arranged in the expansion device; an instantaneous pressure relief valve is arranged in the communication pipeline of the expansion device and the buffer tank, and the buffer tank is communicated with the atmosphere. Sodium hydrogen carbonate is heated by a heating system to be decomposed to generate sodium carbonate; when the pressure reaches a certain value in the reaction, the pressure is instantaneously relieved to the buffer tank. The generated sodium carbonate is grinded by the grinding device and is sprayed into a desulfurizing tower by an ejection system after reaching a certain number to react with SO2 so as to desulfurize. The system has the advantages of simple structure, little investment, convenience in operation and the like.

Description

Technical field: [0001] The invention relates to a dry desulfurization agent pretreatment system and a pretreatment method, belonging to the field of air pollution control of coke ovens. Background technique: [0002] Coke is formed by heating coal in the carbonization chamber of a coke oven under air-isolated conditions and undergoing a series of complex processes of physical changes and chemical reactions. The coke oven gas produced during coke carbonization contains pollutants such as sulfur dioxide and nitrogen oxides, which will generate new pollution in the subsequent use process. These sulfur dioxide and nitrogen oxides are important components of PM2.5 particulate matter, and are also the main cause of acid rain and smog. Its production mechanism is: the heat source of the carbonization chamber is provided by a certain proportion of coke oven gas and blast furnace gas heating the vertical fire channel, and the waste gas produced by heating the gas is called coke ove...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/83B01D53/50C10K1/30
Inventor 郑光明王充尹华冯引军苏龙龙
Owner ANHUI TONGXING ENVIRONMENTAL PROTECTION ENG
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