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Method for producing hydrogen by converting urban garbage

A technology for the production of hydrogen and municipal waste, applied in chemical instruments and methods, biochemical equipment and methods, gas production bioreactors, etc. To achieve the effect of preventing the formation of dioxins, achieving harmlessness, and avoiding the risk of secondary pollution

Pending Publication Date: 2022-02-22
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The prior art discloses technologies such as fermenting garbage to produce hydrogen or methane and gasifying garbage to generate natural gas, all of which have the problem of single technology. Due to the characteristics of large fluctuations in production volume and composition, direct fermentation or direct gasification will be limited. Therefore, it is necessary to choose a suitable comprehensive waste treatment technology according to the characteristics of domestic waste in our country.

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  • Method for producing hydrogen by converting urban garbage
  • Method for producing hydrogen by converting urban garbage
  • Method for producing hydrogen by converting urban garbage

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specific Embodiment approach

[0034] Such as figure 1 As shown in a specific embodiment provided by the present invention, the first aspect of the present invention provides a method for converting municipal waste into hydrogen, the method comprising:

[0035] (1) Anaerobic fermentation of kitchen waste to obtain biogas residue and biogas;

[0036] (2) Dry and pyrolyze other garbage with the biogas residue after pre-sorting to obtain garbage semi-coke and pyrolysis gas; the temperature of the pyrolysis reaction is 350-650°C, and the pyrolysis time 20-120min;

[0037] (3) Carrying out the gasification reaction of the garbage semi-coke and pyrolysis gas to obtain crude synthesis gas and ash;

[0038] (4) returning a part of the crude synthesis gas to step (2) as a heat source for the drying and pyrolysis reactions; mixing the biogas with the remaining part of the crude synthesis gas, followed by purification, steam regenerating Rectification and conversion reaction, get rich in H 2 product gas.

[0039]...

Embodiment approach

[0056] According to a preferred embodiment, the purification treatment includes:

[0057] S1: Dedusting the crude synthesis gas to obtain dedusted gas, dust and fly ash;

[0058] S2: Purify and deacidify the dedusted gas to obtain synthesis gas;

[0059] S3: returning the dust and fly ash to the gasifier for high-temperature slag treatment.

[0060] In step (4), the present invention has no special limitation on the steam reforming and shift reaction, and can refer to the existing gasification hydrogen production technology. The specific operation is well known in the art and will not be repeated here.

[0061] According to a preferred embodiment of the present invention, in order to obtain relatively high-purity product hydrogen for separation, preferably the method further includes (5) drying and separating the product obtained in step (4) to obtain product hydrogen and purge gas. The released gas is returned to the gasifier for gasification reaction.

[0062] The method ...

Embodiment 1

[0088] (1) After the kitchen waste is pretreated, a fermentation raw material with a w(C) / w(N) value of 30 is obtained, which is sent to an organic biochemical treatment workshop for anaerobic fermentation treatment, and 25% by weight of Anaerobic sludge with a large amount of methanogens, the anaerobic fermentation temperature is controlled at 35°C, the pH value is 7.5, and the anaerobic fermentation treatment time is 15 days to obtain biogas and biogas residue;

[0089] (2) Other garbage is sorted to remove incombustibles such as glass, metal, stones, etc., and then enters the pyrolysis reactor with biogas residue, and is dried and heated under the indirect heating of part of the crude synthesis gas from the gasifier. Decomposition reaction to obtain garbage semi-coke and pyrolysis gas, the pyrolysis temperature in the reactor is 450 ° C, and the pyrolysis time is 80 minutes;

[0090] (3) Garbage semi-coke and pyrolysis gas enter the gasifier, and undergo gasification reacti...

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Abstract

The invention relates to the field of energy environmental protection, and discloses a method for producing hydrogen by converting urban garbage. The method comprises the following steps: (1) carrying out anaerobic fermentation treatment on kitchen garbage to obtain biogas residues and biogas; (2) sorting other garbage, carrying out drying and pyrolytic reaction on the sorted garbage and the biogas residues to obtain garbage semi-coke and pyrolysis gas, wherein the temperature of the pyrolytic reaction ranges from 350 DEG C to 650 DEG C, and the pyrolytic time ranges from 20 min to 120 min; (3) carrying out gasification reaction on the garbage semi-coke and the pyrolysis gas to obtain crude synthesis gas and ash residue; and (4) returning a part of the crude synthesis gas to the step (2) to serve as a heat source for the drying and pyrolytic reaction, mixing the biogas with the residual part of the crude synthesis gas, and then sequentially carrying out purification, steam reforming and transformation reaction. According to the method provided by the invention, the difference of different urban garbage can be reduced, harmless and sufficient resourceful treatment of the urban garbage is realized by utilizing a comprehensive treatment technology, and meanwhile, large-scale, rapid and low-cost hydrogen preparation can be realized.

Description

technical field [0001] The invention relates to the field of energy and environmental protection, in particular to a method for producing hydrogen by transforming municipal waste. Background technique [0002] As a green and efficient energy source, hydrogen energy is regarded as one of the most promising clean energy sources in the 21st century. Currently, the most commonly used hydrogen production technologies are fossil fuel hydrogen production technology and electrolysis water hydrogen production technology. The advantages of fossil fuel hydrogen production The technology is mature, but the disadvantage is that fossil fuels are non-renewable resources, and the energy consumption is high; the hydrogen production process by electrolysis of water is simple, and the product hydrogen purity is high, but its efficiency is low and the production cost is high. Therefore, how to produce hydrogen on a large scale, at low cost and with high efficiency has attracted extensive attent...

Claims

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Application Information

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IPC IPC(8): C01B3/32C10B53/00C12P5/02C12M1/107B09B3/40B09B3/45B09B3/65B09B5/00B09B101/70
CPCC01B3/323C10B53/00C12P5/023C12M21/04C12M43/00B09B3/00B09B5/00Y02E50/30
Inventor 次东辉苌亮高浩华杜万斗李文华刘延鑫
Owner CHNA ENERGY INVESTMENT CORP LTD
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