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Method for producing hydrogen by converting municipal solid waste

A technology for municipal solid waste and hydrogen production, which is applied in gasification process, granular/powder fuel gasification, petroleum industry, etc., can solve the problems of clogging of multi-functional nozzles, difficulty in direct crushing of waste, and high operating costs, so as to reduce waste and reduce waste. The effect of reducing the cost of liquid treatment, avoiding the risk of secondary pollution, and improving the gasification efficiency

Pending Publication Date: 2020-12-29
CHNA ENERGY INVESTMENT CORP LTD +1
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Problems solved by technology

However, this method also has the following defects: 1) my country's urban waste has the characteristics of high food waste content, high moisture content, low calorific value, and large fluctuations in production and composition, making it low in thermal efficiency during combustion and gasification; 2) The composition of urban waste is complex, and it is difficult to crush the waste directly, or the energy consumption is relatively high; 3) Urban waste particles can easily cause blockage of the multi-functional nozzle
This method of using plasma gasification technology to gasify garbage has high requirements on the device and high operating costs, and only uses some of the products of garbage pyrolysis, and other pyrolysis products have not been realized as resources, which also causes waste
[0009] my country's municipal solid waste has the characteristics of high food waste content, high moisture content, low calorific value, and large fluctuations in production and composition. Its calorific value is 4000-6000kJ / kg, so the direct gasification of municipal waste is limited. The gasification temperature is low, the gasification efficiency is poor, the tar output is high, and the operation stability of the gasification process is poor

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  • Method for producing hydrogen by converting municipal solid waste
  • Method for producing hydrogen by converting municipal solid waste
  • Method for producing hydrogen by converting municipal solid waste

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Embodiment approach

[0051] According to a preferred embodiment, the purification treatment includes:

[0052] S1: Dedusting the crude synthesis gas to obtain dedusted gas, dust and fly ash;

[0053] S2: Purify and deacidify the dedusted gas to obtain synthesis gas;

[0054] S3: returning the dust and fly ash to the gasifier for high-temperature slag treatment.

[0055] In step (5), the present invention has no special limitation on the conversion reaction, and it can be carried out with reference to the coal-water slurry gasification hydrogen production technology, and the specific operation is well known in the art, and will not be repeated here.

[0056] According to the method of the present invention, in order to separate and obtain high-purity product hydrogen, preferably the method further includes: (6) drying and separating the product obtained in step (5) to obtain product hydrogen and purge gas, the purge gas Return to the gasifier for gasification reaction.

[0057] The method of the...

Embodiment 1

[0085] (1) Municipal solid waste is sorted and crushed, and after removing non-combustible materials such as glass and metal, it is placed in municipal waste storage bin 1 for 4 days, and the moisture in the waste is drained, so that the total moisture content of the waste is reduced to 43% by weight , and use the leached waste liquid as subsequent pulping water;

[0086] (2) The waste material enters the pyrolysis reactor 2, is dried under the indirect heating of the crude synthesis gas from the gasifier 4, and undergoes a pyrolysis reaction to obtain waste semi-coke and pyrolysis gas. The final heat in the reactor is The solution temperature is 450°C, and the residence time of garbage raw materials is 40 minutes;

[0087] (3) Grinding and stirring garbage semi-coke, garbage waste liquid, coal powder, and sodium methylene bis-naphthalene sulfonate according to mass percentages of 40%, 38.5%, 20% and 1.5%, to make coal-water slurry;

[0088] (4) Coal water slurry and pyrolysi...

Embodiment 2

[0093] (1) process municipal solid waste according to the method of embodiment 1, obtain garbage raw material and garbage waste liquid;

[0094] (2) The waste material enters the pyrolysis reactor 2, is dried under the indirect heating of the crude synthesis gas from the gasifier 4, and undergoes a pyrolysis reaction to obtain waste semi-coke and pyrolysis gas. The final heat in the reactor is The solution temperature is 550°C, and the residence time of garbage raw materials is 60 minutes;

[0095] (3) Grinding and stirring garbage semi-coke, garbage waste liquid, coal powder, and sodium methylene bis-naphthalene sulfonate according to mass percentages of 44%, 39.5%, 15% and 1.5%, to make coal-water slurry;

[0096] (4) Coal water slurry and pyrolysis gas enter the gasifier 4, and carry out gasification reaction and cracking reaction under the action of oxygen to obtain crude synthesis gas, and control the oxygen-carbon ratio to 0.95m 3 / kg, the gasification pressure is 5MPa;...

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Abstract

The invention relates to the field of municipal solid waste treatment, and discloses a method for producing hydrogen by converting municipal solid waste. The method comprises the following steps: (1)screening the municipal solid waste to remove incombustibles, and draining water to obtain waste liquid and a waste raw material; (2) feeding the waste raw material into a pyrolysis reactor for dryingand pyrolysis reaction to obtain garbage semicoke and pyrolysis gas; (3) mixing the garbage semicoke, the waste liquid, pulverized coal and a dispersing agent to prepare coal water slurry; (4) feeding the coal water slurry and the pyrolysis gas into a gasification furnace for gasification reaction to obtain crude synthesis gas and ash; and (5) indirectly exchanging heat between part of the crudesynthesis gas and the pyrolysis reactor to provide heat, then conducting mixing with the residual crude synthesis gas, and sequentially carrying out purification and shift reaction. According to the method provided by the invention, the difference of different municipal wastes can be reduced, the problem of secondary pollution caused by waste incineration is solved, harmless and full resourceful treatment of municipal domestic wastes is realized, and meanwhile, large-scale, rapid and low-cost preparation of hydrogen can be realized.

Description

technical field [0001] The invention relates to the field of municipal solid waste treatment, in particular to a method for converting municipal solid waste to produce hydrogen. Background technique [0002] As a green and efficient energy source, hydrogen energy has become a key aspect in my country's future energy development. The hydrogen consumption market is huge. As of February 2018, my country has 31 hydrogen refueling stations that have been built or are under construction. my country has a huge demand for hydrogen. [0003] Existing hydrogen production technologies include fossil fuel hydrogen production technology, electrolysis water hydrogen production technology, biological hydrogen production technology, and solar hydrogen production technology. Among them, the fossil fuel hydrogen production technology is mature, but fossil fuels are non-renewable resources, and the energy consumption is high; the electrolytic water hydrogen production technology has a simple ...

Claims

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Application Information

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IPC IPC(8): C10J3/46C10J3/58
CPCC10J3/46C10J3/58C10J2300/0946C10J2300/0959C10J2300/1653Y02E20/18
Inventor 次东辉高浩华苌亮杜万斗李文华
Owner CHNA ENERGY INVESTMENT CORP LTD
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