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Method for performing biogas desulfurization and decarburization by combining solid waste and waste alkali liquor

A solid waste and biogas desulfurization technology, applied in the direction of gas fuel, petroleum industry, fuel, etc., can solve the problems of natural gas purification reaching the pipeline transmission standard, adding traditional treatment technology, and poor stability of membrane performance, etc., achieving good application prospects, The effect of increasing the reaction rate and increasing the adsorption rate

Inactive Publication Date: 2020-08-25
CHINA HUANENG GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main reason is that the complex membrane making process makes the production cost high, and the performance stability of the membrane is poor due to the limitation of the current industrial production level.
At present, membrane separation technology cannot guarantee that the purification degree of natural gas can reach the pipeline transmission standard under any circumstances, so it is necessary to add traditional treatment technology as the final purification step

Method used

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  • Method for performing biogas desulfurization and decarburization by combining solid waste and waste alkali liquor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1) make a suspension slurry of 200g (fly ash) / L (waste lye) according to the solid-to-liquid ratio of 30g / L waste lye with a dry fly ash and sodium hydroxide concentration;

[0030] 2) Experiments were carried out using simulated biogas containing 40% of the volume fraction of carbon dioxide and 3% of the volume fraction of hydrogen sulfide, and the rest being methane;

[0031] 3) Pass the suspension slurry in step 1) and the simulated biogas in step 2) to the spray tower at 80°C, with a liquid-to-gas ratio of 15L / m 3 Desulfurization and decarburization reaction under the condition;

[0032] 4) The suspension after the desulfurization and decarbonization reaction is separated from solid and liquid by sedimentation and filtration, and the solid waste is collected for the production of building materials and other products, and the waste lye is discharged from the system;

[0033] 5) Use a flue gas analyzer to analyze the concentration of carbon dioxide and hydrogen sulf...

Embodiment 2

[0038] Adopting sodium hydroxide is the spent lye of main component, adopts a kind of in fly ash, steel slag, tailings slag as solid raw material, other conditions and parameters are with embodiment 1, by table 2 experimental result it can be seen that adopting fly ash effect is the best Well, this is due to the high content of basic oxides in fly ash, which is conducive to the desulfurization and decarburization reactions.

[0039] Table 2 The removal rate of desulfurization and decarbonization reaction of different solid waste raw materials

[0040] Solid Waste Raw Materials fly ash Carbide slag steel slag Tailings Carbon dioxide removal rate (%) 88 86 82 84 Hydrogen sulfide removal rate (%) 89 82 87 90

Embodiment 3

[0042] Using sodium hydroxide as the main component of waste lye and fly ash as raw materials, the solid-liquid ratio is 50g (solid waste) / L (waste lye), 100g (solid waste) / L (waste lye), 200g (solid waste) / L (waste lye), 300g / L (waste lye), 400g (solid waste) / L (waste lye), 500g (solid waste) / L (waste lye) , other conditions and parameters are with embodiment 1, and as known from table 3, solid-to-liquid ratio is 200g (solid waste) / L (waste lye) reaction effect is the best. In this system, the solid waste mainly plays the role of removing carbon dioxide, and the lye mainly plays the role of removing hydrogen sulfide. Under the relatively moderate solid-liquid ratio conditions, the desulfurization and decarbonization reactions can achieve high efficiency.

[0043] Table 3 The removal rate of desulfurization and decarburization reaction with different solid-liquid ratios

[0044]

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Abstract

The invention discloses a method for performing biogas desulfurization and decarburization by combining solid waste and waste alkali liquor, and belongs to the technical field of biogas impurity removal and purification. According to the method, suspension liquid is prepared from basic oxide solid waste and waste alkali liquor; biogas is introduced into the suspension liquid so as to be subjectedto desulfurization and decarburization reaction, so that desulfurized and decarburized biogas purified gas can be obtained; alkaline substances in the waste alkali liquor are utilized to promote conversion of carbon dioxide into carbonate, promote conversion of hydrogen sulfide into metal sulfide, strengthen the formation of calcium and magnesium carbonate precipitates and achieve permanent fixation of the carbon dioxide and hydrogen sulfide. According to the method, the waste is used as raw materials, therefore, cost is low, and the win-win outcome of waste utilization and environmental protection is realized. The method is simple in reaction process and rapid in reaction, removes the carbon dioxide and hydrogen sulfide in the biogas at the same time, and is a biogas purification technology with high efficiency and low cost.

Description

technical field [0001] The invention belongs to the technical field of biogas impurity removal and purification, and in particular relates to a method for combining solid waste and waste lye to desulfurize and decarbonize biogas. Background technique [0002] Biogas is a flammable mixed gas produced by microbial fermentation of organic matter under anaerobic conditions. Its main components are methane and carbon dioxide, in addition to a small amount of hydrogen, nitrogen, carbon monoxide, hydrogen sulfide and ammonia, etc., the volume content of carbon dioxide At 25%-40%. The concentration of hydrogen sulfide in biogas is affected by the fermentation raw materials or fermentation process, and its content varies greatly, generally in the range of 0.8-14.5g / m 3 , this value has exceeded the national standard, so before using the biogas, the biogas must first be treated for impurity removal and purification. Purification and purification of biogas can not only replace tradit...

Claims

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Application Information

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IPC IPC(8): C10L3/10
CPCC10L3/103C10L3/104
Inventor 刘蓉王晓龙肖天存刘练波郜时旺
Owner CHINA HUANENG GRP CO LTD
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