Process device for extracting high-purity carbon dioxide from landfill gas, marsh gas and chemical exhaust

Abstract

The invention provides a processing device for extracting high-purity carbon dioxide from landfill gas, marsh gas and chemical exhaust. The processing device for extracting high-purity carbon dioxidefrom the landfill gas, the marsh gas and the chemical exhaust comprises a pretreatment system, a cryogenic rectification system and a refrigeration system. The pretreatment system sequentially comprising a raw material compressor, a precooler and a desulfurization tower. The cryogenic rectification system comprises a first rectification column, a second rectification column, a carbon dioxide storage tank and a gas-liquid separator. The refrigeration system sequentially comprises an ammonia compressor, a first reboiler, a second reboiler, a top condenser and a regenerator, wherein the first reboiler and the second reboiler are connected in parallel and located on the lower portion of the first rectification column and the second rectification column correspondingly. By optimizing the deviceand the pipeline, the processing device for extracting the high-purity carbon dioxide from the landfill gas, the marsh gas and the chemical exhaust is stable in operation and low in energy consumption, can extract high-purity carbon dioxide liquid, greatly improves the utilization rate of the exhaust gas and reduces environmental pollution.

Description

technical field [0001] The invention relates to the technical field of gas rectification and separation equipment, in particular to process equipment for extracting high-purity carbon dioxide from landfill gas, biogas or chemical tail gas. Background technique [0002] With the continuous improvement of the material level and the continuous development of industry, a large amount of landfill gas, biogas and chemical tail gas are produced. If they are not handled properly, they will cause a series of problems such as global warming and threats to human health. [0003] For example, landfill gas (biogas) consists of about 60% methane (CH4), 35% carbon dioxide (CO2), 0%-5% nitrogen (N2), less than 1% hydrogen (H2), and less than 0.4% oxygen ( O2) and 0.1%-3% hydrogen sulfide (H2S), about 1%-4% saturated water vapor (H2O) and other gases, the current technical solution is generally to extract methane (CH4) gas as fuel, and the rest All the gases are discharged into the atmosphe...

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Problems solved by technology

[0003] For example, landfill gas (biogas) consists of about 60% methane (CH4), 35% carbon dioxide (CO2), 0%-5% nitrogen (N2), less than 1% hydrogen (H2), and less than 0.4% oxygen ( O2) and 0.1%-3% hydrogen sulfide (H2S), about 1%-4% saturated water vapor (H2O) and other gases, the current technical solution is generally to extract methane (CH4) gas as fuel, and the rest All the gases are discharged into the atmosphere and treated as waste gas, especially 35% carbon dioxide (CO2) gas, which will destroy the ozone layer and cause the global greenhouse effect, and the current global efforts to reduce CO2 emissions The environment runs counter to

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