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Biomass gasification process and device for strengthening molten salt decoking by nickel-based catalyst

A technology of nickel-based catalyst and gasification device, applied in gasification process, petroleum industry, manufacture of combustible gas, etc., can solve the problems of reducing the yield of product gas and synthesis gas, increasing the difficulty of cleaning system pipelines, etc. Long-term recycling, beneficial to reformation and conversion, and the effect of promoting reformation and conversion

Pending Publication Date: 2019-11-05
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The generation of tar reduces the yield of product gas and synthesis gas, and increases the difficulty of cleaning the system pipeline

Method used

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  • Biomass gasification process and device for strengthening molten salt decoking by nickel-based catalyst
  • Biomass gasification process and device for strengthening molten salt decoking by nickel-based catalyst
  • Biomass gasification process and device for strengthening molten salt decoking by nickel-based catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0047] Embodiment 1: Take the Chinese fir sawdust of block as raw material, with the block particle of 0.25g / sheet compression finalization, the feed mass ratio of water vapor and biomass is 1, and the flow velocity of air is 0.5 L / min, adopts figure 1 The structure of the biomass gasification reaction, but the figure 1 The gasification decoking reactor 5 is replaced by a gasification reactor. There is no molten salt and catalyst inside the gasification reactor. The biomass and gasification agent undergo gasification reaction in the gasification reactor at 750°C, and the products are mainly Ash solids and volatile gases. The results of the examples are as follows: in the volatile matter obtained from biomass gasification, the tar yield was 3.7wt.%.

Embodiment 2

[0048] Embodiment 2: take the fir sawdust of block as raw material, with the block particle of 0.25g / sheet compression finalization, the feed mass ratio of water vapor and biomass is 1, and the flow velocity of air is 0.5 L / min, adopts figure 1 The structure of the biomass gasification reaction, but figure 1 In the gasification decoking reactor 5, only molten salt is used for decoking, and there is no nickel-based catalyst in the gasification decoking reactor 5. Biomass and gasification agent undergo gasification reaction in the gasification chamber of gasification decoking reactor 5 at 750°C, and the products are mainly ash solids and volatile gases, and ash solids come out from the spiral at the bottom of gasification decoking reactor 5 The ash pipe 508 is discharged, and the volatile gas and gasification agent are blown into the molten salt for decoking reaction. After being decoked by the molten salt, the volatile matter and gasification agent enter the condenser to remove...

Embodiment 3

[0049] Embodiment 3: take the Chinese fir sawdust of block as raw material, with the block particle of 0.25g / tablet compression finalization, the feed mass ratio of water vapor and biomass is 1, and the flow velocity of air is 0.5 L / min, adopts figure 1 The structure of the biomass gasification reaction, the nickel-based catalyst used is Ni / Al 2 o 3 , wherein the loading amount of Ni is 15 wt.%, the average particle diameter of the nickel-based catalyst particles is 3 mm, and the sieve hole 504-11 on the tray plate of the concave tray member 505-4 has an aperture diameter of 2.4 mm. The gasification decoking reactor used is as figure 2As shown, the coupled decoking of molten salt and nickel-based catalyst is used, and the biomass and gasification agent undergo gasification reaction in the gasification chamber of gasification decoking reactor 5 at 750 ° C. The products are mainly ash solids and volatile gases. The ash solids are discharged from the spiral ash outlet pipe 50...

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Abstract

The invention discloses a biomass gasification process and device for strengthening molten salt decoking by a nickel-based catalyst. The biomass gasification process comprises the steps: volatiles generated by the reaction of biomass and a gasifying agent are blown into molten salt through an air outlet hole in the upper-portion side wall of a gasifying cavity and a gas channel between the outer side wall of the gasifying cavity and the inner side wall of a bubble cap to carry out primary reforming decoking, the volatiles escaping from the molten salt after primary reforming decoking flow intoa nickel-based catalyst particle bed layer to carry out secondary reforming decoking, and after the volatiles subjected to the secondary decoking enter a condenser to remove condensable gases (namelytar and redundant steam), collection is carried out in an air collecting bag to obtain hydrogen-enriched synthetic gas. The device has good adaptability to biomass raw materials, and by means of biomass gasification and coupling of the nickel-based catalyst and molten salt multi-stage decoking, the problem of tar byproducts generated in the biomass gasification process can be effectively solved,and the energy utilization rate in a gasification system can also be remarkably increased.

Description

technical field [0001] The invention relates to the field of energy conversion, in particular to a process and a device for biomass gasification using a nickel-based catalyst to strengthen molten salt decoking. Background technique [0002] Energy shortage and environmental pollution have become important issues facing human survival and development. The pyrolysis and gasification of biomass with the characteristics of low pollution, renewable, abundant resources and wide distribution to produce hydrocarbon gas fuels has become one of the hotspots in the field of energy research in recent years. [0003] In the biomass pyrolysis gasification process, the design of the gasifier is very important. Fixed-bed gasifiers have been popularized and applied in the field of pyrolysis and gasification. Fixed-bed gasifiers (such as technologies disclosed in patents such as ZL96228197.2, ZL98243726.9, ZL201620710566.8 and ZL201620638201.9) do not require pretreatment of raw materials ,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10J3/72C10J3/84
CPCC10J3/72C10J3/84C10J2300/0986
Inventor 姬登祥金科计建炳解庆龙韦一聂勇于凤文
Owner ZHEJIANG UNIV OF TECH
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