Method for preparing combustible gas through co-pyrolysis of sludge and biomass

A biomass and co-pyrolysis technology, which is applied in the preparation of biofuels, liquid hydrocarbon mixtures, gas fuels, etc., can solve the problems of large co-pyrolysis effects and different synergistic effects, and achieve the effect of increasing thermal mass loss rate

Pending Publication Date: 2020-11-27
HUAZHONG NORMAL UNIV +1
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Problems solved by technology

However, the pyrolysis conditions such as reactor type, fuel type, and heating rate are different, and the synergistic effect produced in the process of synergistic pyrolysis of sludge and biomass is also different, especially the temperature and mixing ratio have a greater impact on co-pyrolysis.
The optimal conditions for the mixed pyrolysis of sludge and biomass have not yet been unified, and further research is needed

Method used

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  • Method for preparing combustible gas through co-pyrolysis of sludge and biomass
  • Method for preparing combustible gas through co-pyrolysis of sludge and biomass
  • Method for preparing combustible gas through co-pyrolysis of sludge and biomass

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1 thermogravimetric experiment analysis synergistic effect

[0028] In order to explore the synergistic effect of co-pyrolysis of sludge and wood powder, the TG and DTG curves of sludge and wood powder alone are as follows figure 1 shown.

[0029] On this basis, the blending ratio and the respective TG / DTG were calculated theoretically in a weighted form, and the theoretical TG / DTG curve of the mixed sample was obtained. Because the theoretical calculation is based on the linear superposition assumption that the co-pyrolysis process is regarded as a single raw material pyrolysis, that is, there is no interaction between sludge and wood powder, so when the calculation results are basically consistent with the experimental results, it means that there is no interaction between the two. obvious interaction. In this study, the calculated TG / DTG curve was compared with the experimental TG / DTG curve. The results are as follows: figure 2 shown.

[0030] It can ...

Embodiment 2

[0031] The influence of embodiment 2 different wood flour mixing ratios on the three-phase yield

[0032] The pyrolysis temperature was set at 900°C, and the effect of the wood flour blending ratio on the yield of the three-phase product of co-pyrolysis of sludge and wood flour was investigated. The results are as follows image 3 shown.

[0033] Depend on image 3 It can be seen that: when the wood flour blending ratio increases from 0 to 100wt.%, the gas yield increases from 3.29% to 26.06%, the tar yield increases from 11.61% to 51.80%, while the solid yield decreases from 85.09% to 22.14%. This can be explained by the fact that wood flour has a relatively high volatile content and low ash content, adding to the sludge improved the gas yield during the co-pyrolysis process. In order to evaluate possible synergistic effects during the co-pyrolysis process, the experimental and theoretically calculated yields of each phase at different wood flour blending ratios were compa...

Embodiment 3

[0039] The influence of embodiment 3 different wood flour blending ratios on gas products

[0040] In the process of co-pyrolysis of sludge and wood flour, the raw material first undergoes a pyrolysis reaction to generate steam, biochar, non-condensable gas and tar (1). Then the secondary pyrolysis reaction occurs, that is, the primary pyrolysis reaction of tar (2), the non-condensable gas C 3 h 8 、C 2 h 6 、C 2 h 4 Reactions such as chain scission and dehydrogenation occur (3)(4)(5). This process will form an atmosphere rich in steam, under this atmosphere, gas-solid phase reactions will occur, such as boudouard reaction (6), water gas reaction (7) (8), and gas phase reactions will also occur, such as reverse water gas Shift reactions (10), methane and hydrocarbon steam reforming reactions (11) (12). Co-pyrolysis of final gas components depends on a series of complex and competing reactions.

[0041] A pyrolysis reaction:

[0042]

[0043] Secondary pyrolysis reactio...

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Abstract

The invention relates to a method for preparing combustible gas through co-pyrolysis of sludge and biomass, and belongs to the field of environmental protection and energy. Municipal sludge is dried,and the dried municipal sludge and biomass are respectively crushed; the crushed municipal sludge is mixed with the biomass, wherein the mass ratio of the biomass in the mixture is 20-80%; the mixtureis placed in a reactor to be pyrolyzed at 700-900 DEG C, and generated gas is used as combustible gas. After wood flour is doped into the sludge, catalytic cracking of tar is promoted, the yield of co-pyrolysis product tar is reduced, and the gas yield is increased. Particularly, when the mixing ratio of the wood flour is 20% at 900 DEG C, the volume percentage of the combustible gas is obviouslyincreased and is 20.47% higher than the theoretically calculated value, and the calorific value of the gas is increased by 47.02%.

Description

technical field [0001] The invention relates to a method for co-pyrolyzing sludge and biomass to prepare combustible gas, which belongs to the fields of environmental protection and energy. Background technique [0002] With the continuous improvement of my country's urbanization and sewage treatment level, the output of sewage sludge has also increased sharply. Every 10,000 tons of sewage treated by sewage treatment plants will produce 5-10 tons of sludge. How to quickly reduce a large amount of sludge, Harmless resource treatment is a research and development hotspot in this field. Sludge is a solid sediment produced in the sewage treatment process, which has potential for resource utilization. At the same time, because sludge contains a large amount of volatile organic compounds, carries a large number of bacteria The content of microorganisms such as parasite eggs and heavy metals is also high, which makes urban sludge easy to become moldy and smelly, and breeds germs. If ...

Claims

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Application Information

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IPC IPC(8): C02F11/10C02F11/12C10B53/00C10B53/02C10G1/00C10L3/00C10L3/08
CPCC02F11/10C02F11/12C10L3/00C10L3/08C10B53/00C10B53/02C10G1/00Y02W10/40Y02E50/10
Inventor 吴正舜陈梁却家俊姬梦欣郑莲莲张俊吴海波任少辉
Owner HUAZHONG NORMAL UNIV
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