Method for preparing methane-rich gas by utilizing wastes

A waste and methane-enriched technology, which is applied in the direction of gas fuel, special carbonization, petroleum industry, etc., can solve the problem that waste semi-coke has no application market, etc., and achieve the effect of convenient subsequent utilization, mild preparation conditions and simple operation process

Active Publication Date: 2020-07-03
TONGJI UNIV
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Problems solved by technology

[0016] In summary, for the existing technology, the use of syngas to produce methane is based on industrial sources of H 2 / CO gas and commercial high-value catalysts are not suitable for the current situation of waste pyrolysis gasification gas recovery and utilization with low value itself, and the problem that waste semi-coke has no application market

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  • Method for preparing methane-rich gas by utilizing wastes
  • Method for preparing methane-rich gas by utilizing wastes

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preparation example Construction

[0045] Such as figure 2 As shown, in the present invention, the preparation method of catalyst 12 specifically includes the following sub-steps:

[0046] Step 2-1, place semi-coke 7 in the saline solution containing active component 81 for full impregnation, in the present invention, before impregnating the saline solution with active component, semi-coke is first ground; then filtered; A small amount of chitosan or flour 9 is added as a binding agent and molded in a molding machine 82 to obtain semi-coke-based catalyst particles.

[0047] In the present invention, the molding machine 82 may be selected from an extrusion molding machine, a disc granulator, and the like.

[0048] In the present invention, the salt solution is one of nitrate saturated solution, nitrite saturated solution, sulfate solution, carbonate solution, basic carbonate solution and acetate solution; and perform molding operation, preferably , so that the particle size of the shaped particles is 4-60 mes...

Embodiment 1

[0060] In step 1, 50 t / d of domestic waste oversize with a moisture content of 42% is placed in a rotary kiln reactor, and continuously pyrolyzed at 700° C. to obtain semi-coke 7 and volatile components 3 .

[0061] Step 2, catalytic reforming of volatiles 3 with 75% semi-coke 7 in reforming reactor 4 to obtain hydrogen-rich and CO / CO 2 Syngas 5 whose composition is H2 :60%, CO: 25%, CO 2 : 13%, other ingredients 2%, also contains tar and a small amount of C 2 、C 3 At the same time, 25% of the mass of semi-coke 7 is used to remove stones and other sundries through sieving, grind to a particle size of about 150 mesh, and then impregnate a saturated solution of nickel nitrate. The active component 81 is nickel, then filter, and then add A small amount of chitosan 9 is kneaded and extruded in a molding machine 82 to make particles with a particle size of 4 to 10 meshes, then dried in a reactor 83, fed with nitrogen and roasted to 500 ° C for a period of time, and then It is th...

Embodiment 2

[0065] In step 1, 50 t / d of sewage sludge with a water content of 22% is placed in a rotary kiln reactor and continuously pyrolyzed at 550° C. to obtain semi-coke 7 and volatile components 3 .

[0066] Step 2, catalytic reforming of volatiles 3 with 70% semi-coke 7 in reforming reactor 4 to obtain hydrogen-rich and CO / CO 2 of syngas whose composition is H 2 :62%, CO: 20%, CO 2 : 15%, other ingredients 3%, also contains tar and a small amount of C 2 、C 3 At the same time, use 30% of the quality of semi-coke 7 to remove stones and other sundries through sieving, grind to 200 mesh, send it into a saturated solution of cobalt nitrate for impregnation, the active component 81 is cobalt, then filter, and then add a small amount of Chitosan and lanthanum oxide with 0.5% semi-coke mass are kneaded and extruded in a molding machine 82 to make particles with a particle size of 5 to 8 meshes, then first dried in a reactor 83, and then fed with nitrogen to raise the temperature to 400 ...

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Abstract

The invention provides a method for preparing methane-rich gas from waste, which comprises the following steps: 1. putting waste in a pyrolysis reactor, and carrying out pyrolysis at 400-700 DEG C toobtain a solid-phase product semicoke and volatile matters, 2, carrying out catalytic reforming on the volatile matters in a reforming reactor by using 60-75% of semicoke to obtain synthesis gas richin hydrogen and CO/CO2, loading active components on 25-40% of semicoke in a catalyst preparation system, and carrying out roasting and activation to obtain a catalyst, and 3, feeding the synthesis gas and a catalyst into a methanation reactor for a reaction, so that methane-rich gas is obtained, wherein the concentration of methane in the methane-rich gas is higher than 35%, and the concentrationof H2 in the methane-rich gas is lower than 20%. According to the method, the catalyst is prepared on the basis of the semicoke, the pyrolysis reforming product from the waste is adjusted into the gas rich in methane, subsequent utilization is facilitated, the method has important practical significance and value, thorough clean utilization of the waste is achieved, and the quality and efficiencyof waste recycled energy are improved.

Description

technical field [0001] The invention belongs to the field of waste treatment, and in particular relates to a method for preparing methane-enriched gas from waste. Background technique [0002] Waste includes domestic garbage, straw, forestry waste wood branches, sludge, livestock and poultry manure, etc., which are large in volume and wide in scope. Incineration is likely to produce secondary pollution, and landfill wastes resources and causes more serious secondary pollution. Pyrolysis gasification refers to the technology of heating waste to a certain temperature under the condition of no oxygen and possibly containing gasification agent to obtain gas phase combustible gas, liquid phase oily liquid and solid phase charcoal. Compared with direct incineration of waste, it has the advantages of high calorific value of gas phase products, no hazardous waste such as fly ash, and no dioxin; compared with landfill treatment of waste, it has the advantages of less land occupation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B53/00C10L3/08
CPCC10B53/00C10L3/08
Inventor 陈德珍雒佳尹丽洁冯昱恒戴晓虎
Owner TONGJI UNIV
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