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High-temperature catalytic combustion device and method for liquid nitrogen washing tail gas

A high-temperature catalytic and combustion device technology, applied in the direction of combustion method, combustion type, incinerator, etc., can solve the problems of high furnace temperature, limited use range, heat waste, etc., and achieve low investment cost, simple structure, and low operating cost Effect

Active Publication Date: 2019-09-27
KUNMING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, low-temperature catalytic combustion has the following disadvantages: (1) Some enterprises have another heat path for drying pulverized coal, and do not need the heat of liquid nitrogen to wash the tail gas, so low-temperature catalytic combustion cannot be used to obtain heat; (2) Low-temperature catalytic combustion of liquid nitrogen to wash the tail gas Burning excess heat can only produce low-pressure saturated steam. For ammonia plants, low-pressure steam is of little use and will cause waste of heat; (3) The furnace temperature of high-pressure boilers is very high, and the low-temperature combustion temperature of liquid nitrogen washing tail gas is 450 ° C, which is comparable to The boiler furnace temperature difference is too large, so it cannot be sent to the high-pressure boiler for mixed use, which limits the scope of use

Method used

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  • High-temperature catalytic combustion device and method for liquid nitrogen washing tail gas

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preparation example Construction

[0036] In the present invention, the preparation method of the catalyst preferably comprises the following steps:

[0037]1) mixing lanthanum nitrate, manganese nitrate, a first metal nitrate compound, citric acid and water, and complexing the obtained first mixture to obtain a gel;

[0038] 2) performing a first calcination on the gel to obtain a first carrier product;

[0039] 3) mixing the first carrier product, aluminum nitrate, the second metal nitrate compound and water, and performing a precipitation reaction on the obtained second mixture under the action of a buffer to obtain a precipitate;

[0040] 4) Carrying out the second roasting of the precipitate to obtain the second carrier product;

[0041] 5) immersing the second carrier product in a palladium nitrate solution for impregnation, and then drying the obtained mixture in sequence and third roasting to obtain a catalyst;

[0042] The first metal nitrate compound is yttrium nitrate and / or strontium nitrate;

[...

Embodiment 1

[0064] Liquid nitrogen scrubbing tail gas component: H 2 1.98%, CO 8.44%, N 2 87.9%, CH 4 1.59%, control liquid nitrogen to wash tail gas: air=1:0.466 (volume ratio).

[0065] The combustible gas is sent to the auxiliary burner, and the air is sent to the auxiliary burner by the auxiliary blower to carry out combustible gas combustion. When the temperature reaches 400-450°C, the liquid nitrogen scrubbing tail gas is sent from the main pipe to the main burner, and the liquid nitrogen is controlled. The exhaust gas flow rate is 20000m 3 / h, the air is sent to the main burner by pressurizing the blower to 5kPa, and the air volume is controlled to be 9320Nm 3 / h, liquid nitrogen scrubbing tail gas and air are burned in the high-temperature catalytic combustion furnace, the combustion temperature is 790-800°C, hot flue gas is obtained from the outlet of the high-temperature catalytic combustion furnace, and O in the hot flue gas 2 3~4%, CO, CH 4 The concentration is less than ...

Embodiment 2

[0068] The difference between this embodiment and Example 1 is that the liquid nitrogen washing tail gas is controlled: air=1:0.5, and the liquid nitrogen washing tail gas flow rate is 30000m 3 / h, blast volume 15000Nm 3 / h, the combustion temperature is 720-750°C, the oxygen content in the outlet hot flue gas obtained is 8-10%, and the CO is burned out.

[0069] Sending the hot flue gas into the furnace of the boiler can reduce the amount of fuel in the original boiler and use it as supplementary heat.

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Abstract

The invention belongs to the technical field of energy and environment protection, and particularly relates to a high-temperature catalytic combustion device and method for liquid nitrogen washing tail gas. The high-temperature catalytic combustion device for the liquid nitrogen washing tail gas can achieve high-temperature combustion of the liquid nitrogen washing tail gas, recycled heat is high, the recycled heat can be fully utilized, the using range of the heat is widened, and energy saving and emission reducing are achieved. The high-temperature catalytic combustion device is small in equipment number, small in investment cost, low in running cost, small in energy consumption, and easy, convenient and safe to operate. The high-temperature catalytic combustion device is wide in application range of heat recycled for treating the liquid nitrogen washing tail gas, direct conveying to a pulverized coal drying device is achieved, and drying for pulverized coal is achieved; and conveying to sites needing steam heat supplying is also achieved.

Description

technical field [0001] The invention relates to the technical field of energy and environmental protection, in particular to a high-temperature catalytic combustion device and method for washing tail gas with liquid nitrogen. Background technique [0002] Modern coal chemical production uses coal as raw material, and mostly uses pure oxygen to oxidize. The oxygen produced by the cryogenic air separation unit is used as the gasification agent of the gasifier, and the liquid nitrogen generated at the same time is used to wash the trace amount of CO absorbent in the syngas. At low temperature, using liquid nitrogen as an absorbent, the components CO, Ar, and CH in the raw gas that are close to the boiling point of nitrogen are synthesized 4 Absorbed by liquid nitrogen, after being recovered, it is discharged out of the system in a gaseous state, which is called liquid nitrogen scrubbing tail gas. Liquid nitrogen scrubbing tail gas contains CO, H 2 、CH 4 , Ar and N 2 , The g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23G7/07F23G5/44F23G5/50F23G5/46
CPCF23G7/07F23G5/44F23G5/50F23G5/46
Inventor 宁平刘强张秋林蒋忠成殷梁淘王小勇殷在飞牟刚林
Owner KUNMING UNIV OF SCI & TECH
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