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Up-draft type water vapor gasification device for biomass and tar mixture

A gasification device and water vapor technology, which is applied to the feeding tools of the gasification device, the gasification process, and the fixed bed gasification, etc. problem, to achieve the effect of reducing heavy tar content, reducing sensible heat loss, and avoiding energy loss

Active Publication Date: 2017-05-31
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The object of the present invention is to provide a kind of updraft steam gasification device and method for the mixture of biomass and tar, which utilizes the characteristics of low temperature and long residence time in the upper part of the updraft fixed bed biomass gasifier to emulsify The final tar is fully mixed with the biomass material in the upper part of the up-suction fixed-bed biomass gasifier, and the mixture of biomass material and tar is used to reduce the temperature of the gasification gas and reduce the content of heavy tar in the gas; at the same time, the up-suction The height of the middle part of the fixed-bed biomass gasifier is used to dry the biomass and tar mixture slowly and evenly, and the moisture of the biomass-tar mixture is dried to below 10%, ensuring the lower part of the up-suction fixed-bed biomass gasifier The working conditions of pyrolysis layer, reduction layer, and oxidation layer are not affected by tar moisture, so as to realize the mixed gasification of biomass material and tar in the gasifier, and solve the problem of sending tar with high water content back to high temperature in the prior art The oxidation zone causes changes in the working conditions of the oxidation layer of the gasification equipment (such as lowering the temperature, increasing the air ratio, etc.), resulting in the deterioration of the gasification effect

Method used

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  • Up-draft type water vapor gasification device for biomass and tar mixture
  • Up-draft type water vapor gasification device for biomass and tar mixture
  • Up-draft type water vapor gasification device for biomass and tar mixture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Such as figure 1 Shown is an up-suction steam gasification device for biomass and tar mixture with a biomass processing capacity of 1.5t / h. The device includes an up-suction gasification furnace, the main body is a cylindrical refractory masonry hearth 13 and a steel furnace shell, the lower part of the furnace shell is provided with a rotating grate connected by a dynamic seal, the rotating grate has both the function of air intake and distribution; the upward suction gasifier is divided into an oxide layer from bottom to top 1. The reduction layer 2, the pyrolysis layer 3, the drying layer 4 and the mixing zone 5; the upper part of the upper suction gasifier is provided with a gas outlet 11 and a feed inlet 6, and the top is provided with 1-3 emulsified tars The water injection inlet 7 is provided with an air interface 8 at the bottom of the oxide layer; the gas outlet 11 is connected with an indirect cooler to separate the tar from the gas and obtain the upper layer of...

Embodiment 2

[0037] The device refers to example 1, the operating load is 1t / h, and the air input is 1000Nm 3 / h, the spraying amount of the heavy tar aqueous solution on the top is 200kg / h, the concentration of the heavy tar aqueous solution is 50wt.%, the saturated steam input at the bottom is about 50~80kg / h, and the light tar-containing water atomization interface 10 is open, the bottom contains light tar atomized water input of 20kg / h, of which the tar concentration is 15wt.%. Under this condition, the emulsified heavy tar water is mixed with biomass raw materials in the upper mixing zone of the up-suction gasifier. When the drying layer encounters the rising hot air flow below, it removes moisture and cools part of the tar in the air flow. Interception; the raw material that has been dewatered moves down to the pyrolysis layer to further pyrolyze into volatile matter and solid coke, and the volatile matter is carried upward by the airflow; the solid coke sequentially enters the reducin...

Embodiment 3

[0039] The device refers to Example 1, the difference is that the biomass processing capacity is 2t / h, the top of the device is equipped with 4 emulsified tar water injection ports 7, and the boundary between the oxide layer 1 and the reduction layer 2 is provided with 4 A common nozzle interface 12.

[0040] The operating load is 2t / h, the top of which contains heavy tar aqueous solution, the injection rate is 300~500kg / h, and the bottom of the air through the air interface 8 is 2000Nm 3 / h, the saturated water vapor input at the bottom through the pressurized water vapor interface 9 is 650kg / h, the saturated water vapor parameter is 0.25-0.4MPa, 127-143°C, and the bottom through the light tar atomized water interface 10 The input amount of atomized water containing light tar is 100kg / h, of which the tar content is 50-100g / L. Under these operating conditions, the residence time of the heavy tar aqueous solution and the biomass raw material in the upper mixing zone 5 of the updra...

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Abstract

The invention discloses an up-draft type water vapor gasification device and method for a biomass and tar mixture. The method comprises the following steps: fully mixing emulsified tar with a biomass material at the upper part of an up-draft type fixed bed biomass gasifier, reducing the temperature of gasified fuel gas by utilizing a mixture of the biomass material and the tar and reducing the content of heavy tar in the fuel gas; meanwhile, slowly and uniformly drying the biomass and tar mixture by utilizing the middle height of the up-draft type fixed bed biomass gasifier and drying the moisture of the biomass and tar mixture to below 10 percent. Working conditions in a pyrolysis reduction zone and an oxidative combustion zone at the lower part of the up-draft type fixed bed biomass gasifier are ensured not to be affected by the tar and the moisture, so that the mixed gasification of the biomass material and the tar in the gasifier is realized, and the problem of worse gasification effect caused as the tar with high moisture content is returned to a high-temperature oxidation zone to result in changes in working conditions of gasification equipment in the oxidative combustion zone (such as temperature reduction, air ratio increase and the like) in the prior art is solved.

Description

[0001] Technical field: [0002] The invention relates to the technical field of biomass energy, in particular to an uptake steam gasification device for biomass and tar mixture. [0003] Background technique: [0004] Common biomass gasification devices include fluidized bed, downward suction fixed bed, upward suction fixed bed, vertical suction mixed flow fixed bed and other furnace types. Compared with fluidized bed gasifier, fixed bed is not easy to scale up and has lower gasification intensity, but it also has its significant advantages, such as simple structure, low cost, easy operation, can be used for bulk materials, low fly ash content, etc. Small and medium-scale biomass gas production is still a better choice. [0005] The fixed-bed gasifier includes two basic furnace types: up-suction and down-suction. The main difference is that the airflow and fuel run in different directions. The airflow of the up-suction gasifier flows from bottom to top, and the bottom-suction gasifie...

Claims

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Application Information

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IPC IPC(8): C10J3/02C10J3/20C10J3/24C10J3/72C10G9/00
CPCC10G9/00C10J3/02C10J3/20C10J3/24C10J3/72C10J3/725C10J2300/0976C10J2300/0903C10J2300/0916C10G2300/807C10J2200/15
Inventor 吴创之阴秀丽袁洪友潘贤齐黄艳琴刘华财
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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