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Method and device for negative utilization of biomass carbon by utilizing molten salt

A molten salt and biomass technology, applied in the field of biomass energy utilization, can solve the problems that are not involved and difficult to achieve complete conversion of carbon-containing combustible gas, and achieve the effect of reducing CO2 and meeting energy demand

Active Publication Date: 2021-02-05
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, this process requires the high conversion absorption rate of carbon-containing combustible gas to be realized by passing excessive water vapor. At the same time, it is difficult to realize the complete conversion of carbon-containing combustible gas even if excessive water vapor is passed.
[0004] None of the above patents involves the use of reactive molten salt and calcium-based mixed absorbents to achieve carbon-negative heat utilization of biomass

Method used

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  • Method and device for negative utilization of biomass carbon by utilizing molten salt
  • Method and device for negative utilization of biomass carbon by utilizing molten salt
  • Method and device for negative utilization of biomass carbon by utilizing molten salt

Examples

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Embodiment 1

[0039] Such as Figure 1-5 Shown, a kind of method utilizing molten salt to carry out biomass carbon negative utilization, comprises the following steps:

[0040] (1) Biomass gasification: Biomass enters the downdraft fixed-bed gasifier 1 for gasification, and produces combustible gas containing tar and gasified solid products under the action of gasification agent. The gasification temperature is 800°C. The gasification agent is a mixture of water vapor and oxygen, the ratio of oxygen to water vapor is adjusted by controlling the gasification temperature to 800°C, and the gasification equivalent ratio is 0.28;

[0041] (2) Three-phase reforming: the combustible gas containing tar in step (1) enters the three-phase reforming reactor 2 for reforming, and the reforming reactor is filled with absorbent mixture, and the temperature of the reforming reaction is 500 ° C. The absorbent mixture includes liquid molten salt and solid calcium-based particles, the solid calcium-based par...

Embodiment 2

[0060] Referring to Example 1, the difference is that: the gasification temperature of the downdraft fixed-bed gasifier is 900°C, the gasification agent is air, and the gasification equivalent ratio is 0.29; the reforming temperature is 400°C, and the solid calcium-based particles are Ca(OH) 2 Granular, Ca(OH) 2 The particle diameter is 0.01mm, and the main component of the molten salt is KOH+K 2 CO 3 The mixture, the main component of molten salt is KOH+K 2 CO 3 The molar ratio of the mixture is KOH:K 2 CO 3 =30:70; regeneration temperature is 1200°C; molten salt regeneration heat source is electric heating. The gas composition at each position of the reaction system is shown in Table 2.

[0061] Table 2. Gas composition in different positions of the system (%)

[0062]

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Abstract

The invention discloses a method and a device for negative utilization of biomass carbon by utilizing molten salt. The method comprises the following steps: (1) gasifying biomass in a downdraft fixedbed gasifier to generate tar-containing combustible gas and a gasified solid product under the action of a gasifying agent; (2) performing three-phase reforming: the combustible gas containing tar enters a three-phase reforming reactor to be reformed, the reforming reactor is filled with a mixed absorbent, and the temperature of the reforming reaction is 400-700 DEG C; and (3)performing absorbentregeneration: feeding the mixed absorbent after the reforming reaction into an absorbent regeneration reactor for regeneration, recovering the mixed absorbent to a state before use after regeneration,and releasing CO2. According to the invention, the gasification process of the carbon neutral fuel biomass is combined with the carbon capture and carbon sequestration technology, the carbon negativeutilization of the biomass is realized by reducing the carbon discharged into the atmosphere in the conversion process of the biomass energy, and an approach for reducing the CO2 in the atmosphere while meeting the energy demand is provided.

Description

technical field [0001] The invention relates to the technical field of biomass energy utilization, in particular to a method and device for utilizing molten salt to utilize biomass carbon negatively. Background technique [0002] Biomass is a widely available renewable energy source. Biomass is a low-carbon energy source, with lower sulfur and ash content and higher oxygen content than coal. Since biomass is a carbon-neutral fuel, it is possible to achieve carbon-negative utilization of biomass by reducing the carbon emitted into the atmosphere during the conversion of biomass. This process combines biomass energy utilization technology (Biomass to Energy, BE) with carbon capture and storage technology (carbon capturing and storage, CCS) (ie BECCS, bioenergy with carbon capturing and storage). The BECCS process provides a way to meet energy demand while reducing atmospheric CO 2 way. [0003] Patent CN106675655A discloses a biomass chemical chain gasification hydrogen pr...

Claims

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Application Information

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IPC IPC(8): C10K1/12C10K1/22C10K1/26C10K1/30C10K1/34C10K3/04C10J3/20
CPCC10K1/005C10K1/122C10K1/22C10K1/26C10K1/30C10K3/04C10K1/34C10K1/002C10J3/20Y02P20/10Y02P20/151
Inventor 王小波赵增立郑安庆刘安琪蒋丽群李海滨
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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