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System and method for reducing emission of low-concentration combustible gas

A low-concentration, gas-based technology, applied in chemical instruments and methods, separation methods, gas fuels, etc., can solve problems such as waste of fuel resources, difficulty in direct combustion, environmental pollution, etc., to reduce surface carbon, reduce operating costs, and reduce energy consumption. consumption effect

Active Publication Date: 2022-03-29
TSINGHUA UNIV +1
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Problems solved by technology

The direct discharge of these combustible gases not only brings waste of fuel resources, but also causes environmental pollution
[0003] The common method for industrially treating tail gas containing combustible gases is combustion. However, for the tail gases containing low concentrations of combustible gases such as those listed above, it is difficult to directly burn them because of their low calorific value.

Method used

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  • System and method for reducing emission of low-concentration combustible gas

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Embodiment 1

[0105] Untreated gas for coal mine ventilation with a treatment capacity of 430,000Nm 3 / h, wherein the methane concentration is 0.8%, using a circulating fluidized bed reactor, and the catalyst material is waste copper slag. The gas heat exchanger adopts a rotary heat exchanger. The untreated gas with a temperature of 25°C is sent into the gas heat exchanger, and exchanges heat with the treated hot gas with a temperature of 450°C to form a heated gas with a temperature of about 410°C. After the temperature rises, the gas enters the circulating fluidized bed reactor. The catalyst particles are added through the catalyst feeder and recycled in the reactor, and the waste catalyst particles are discharged from the system through the discharger. After the temperature rises, the low concentration of methane in the gas is oxidized under the catalytic action of the catalyst particles and releases heat. After the temperature rises, the gas is transformed into a treated hot gas. Whe...

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Abstract

The invention relates to a system and a method for reducing emission of low-concentration combustible gas. The system comprises a gas heat exchange unit and a catalytic oxidation unit, the gas heat exchange unit comprises a gas heat exchanger; the gas heat exchanger comprises a first gas channel and a second gas channel; untreated gas enters and passes through the first gas channel; treated gas passes through and is discharged from the second gas channel; the catalytic oxidation unit comprises a fluidized bed reactor, and the fluidized bed reactor is used for carrying out catalytic oxidation reaction on the combustible gas; an outlet of the first gas channel is connected with a gas inlet of the catalytic oxidation unit, and a gas outlet of the catalytic oxidation unit is connected with an inlet of the second gas channel. Heat and mass transfer is enhanced in the fluidization process, heat balance of the system is guaranteed through gas-gas heat exchange, and catalytic oxidation means are adopted, so that the aim of reducing emission of low-concentration combustible gas is achieved.

Description

technical field [0001] The invention belongs to the technical field of industrial process waste gas purification, and in particular relates to a system and method for reducing emission of low-concentration combustible gas. Background technique [0002] The tail gas emitted by many industrial processes contains low concentrations of combustible gases, such as coal mine ventilation (gas content is less than 1%), lime kiln tail gas (CO content is less than 1%), exhaust gas from coking industry (volatile organic compound VOC content is less than 0.1%) Wait. The direct discharge of these combustible gases not only brings waste of fuel resources, but also causes environmental pollution. [0003] Combustion is a common method for industrially treating tail gas containing combustible gases. However, for the tail gases containing low concentrations of combustible gases such as those listed above, it is difficult to directly burn them because of their low calorific value. In order t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/10B01D53/86C10K1/34
CPCC10L3/10B01D53/86C10K1/34
Inventor 由长福王海名
Owner TSINGHUA UNIV
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