Circulating utilization device and method for preparing charcoal-based organic fertilizer by fixed bed straw carbonizing

A technology of straw carbonization and straw molding equipment, which is applied in the direction of steam generation method using heat carrier, organic fertilizer, fertilization equipment, etc., can solve the problems of low combustion temperature, high cellulose content, low melting point of biomass ash, etc., and achieve improvement Effects of improving fermentation efficiency, improving void structure, and improving charcoal quality

Pending Publication Date: 2019-01-25
HEFEI DEBO BIOENERGY SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] my country produces more than 900 million tons of agricultural straw every year, but less than 40% of the existing straw is used, and most of the remaining straw is discarded and burned at will, causing large-scale pollution
The traditional method of returning straw to the field will cause problems such as soil compaction, aggravated pests and diseases, and greenhouse gas emissions
The government put forward the concept of "recycling, full-value utilization, and step-by-step utilization", and increased the utilization rate of straw through subsidies and other means. However, due to the special characteristics of raw materials of straw, its biomass ash melting point is low, it is easy to mildew and rot, and the cellulose content is low. The characteristics of high lignin content and low content make it difficult to effectively use it in the existing industrial methods. As a fuel, the combustion temperature is low and the efficiency is low; as a structural product, it has low strength and is easy to deform; as a biochar product, the charcoal quality is low and the price is lower than that of bamboo charcoal. Other biochar prices are low

Method used

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  • Circulating utilization device and method for preparing charcoal-based organic fertilizer by fixed bed straw carbonizing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037]After the corn stalks are briquetted, they are sent to a fixed-bed straw carbonization device, where they are carbonized at 800°C to produce straw charcoal and straw gas with a carbon content of 45%, and the biomass extract carried in the gas is collected at 160°C. Combustion of straw gas produces high-temperature flue gas. After heat exchange, the flue gas generates steam and 800°C high-temperature air, and discharges 400°C flue gas for use by the drying device. Part of the dried flue gas is sent to the fermentation device, and the waste heat is used to ensure The fermentation temperature is kept stable at 80°C, and the other part is sent to the biosorption device to ensure that the temperature inside the biosorption device is 40°C.

[0038] 35% swill, 10% chicken manure, 5% cow dung, 13% cassava flour, and 7% leaves are mixed in the organic matter pretreatment device, crushed to a suitable particle size, fungi and water are added, and then sent to the fermentation devic...

Embodiment 2

[0040] After the rice straw is briquetted, it is sent to a fixed-bed straw carbonization device, which is carbonized at 350°C to produce straw charcoal and straw gas with a carbon content of 53%, and the biomass extract carried in the gas is collected at 20°C. Combustion of straw gas produces high-temperature flue gas. After heat exchange, the flue gas generates steam and high-temperature air at 150°C, and the flue gas at 150°C is discharged for use by the drying device. Part of the dried flue gas is sent to the fermentation device, and the residual heat is used to ensure The fermentation temperature is kept stable at 40°C, and the other part is sent to the biosorption device to ensure that the temperature in the biosorption device is 20°C.

[0041] 18% of human manure, 11% of rabbit manure, 13% of furfural slag, 21% of distiller's grains, and 22% of bacterial bag waste are mixed in the organic matter pretreatment device, crushed to a suitable particle size, and then sent to th...

Embodiment 3

[0043] After the sorghum straw is briquetted, it is sent to a fixed-bed straw carbonization device, which is carbonized at 550°C to produce straw charcoal and straw gas with a carbon content of 55%, and the biomass extract carried in the gas is collected at 80°C. Combustion of straw gas produces high-temperature flue gas. After heat exchange, the flue gas generates steam and 350°C high-temperature air, and discharges 210°C flue gas for use in the drying device. Part of the dried flue gas is sent to the fermentation device, and the residual heat is used to ensure The fermentation temperature is kept stable at 53°C, and the other part is sent to the biosorption device to ensure that the temperature in the biosorption device is 26°C.

[0044] 7% of moldy feed, 16% of medicinal residue, 3% of soy sauce residue, 45% of sludge, and 21% of rotten fruits and vegetables are mixed in the organic matter pretreatment device, crushed to a suitable particle size, fungi and water are added, a...

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Abstract

The invention provides a circulating utilization device and method for preparing charcoal-based organic fertilizer by fixed bed straw carbonizing. A straw forming device is connected with a fixed bedstraw carbonizing device; the upper part of the fixed bed straw carbonizing device is connected with an air heat exchanger, and the center of the fixed bed straw carbonizing device is connected with asteam heat exchanger through a pipeline; the bottom part of the fixed bed straw carbonizing device is connected with a mixing device; the back part of a biomass extracting liquid collecting device isconnected with a gas combustion chamber; the back part of the gas combustion chamber is sequentially connected with the steam heat exchanger and the air heat exchanger; the back part of the air heatexchanger is connected with a drying device. The circulating utilization device has the advantages that a small amount of high-temperature air is uniformly led into the fixed bed straw carbonizing device, so as to meet the requirement on energy required by the pyrolysis gasifying reaction of straw, and carbonize the straw into straw charcoal under a low-oxygen environment; the reaction temperatureis controlled by water steam, the gap structure of the straw charcoal is improved, the quality of the charcoal is improved, and the content of carbon in the straw charcoal can reach 45% or above.

Description

technical field [0001] The invention relates to the technical field of biomass utilization, in particular to a recycling device and method for preparing carbon-based organic fertilizers by carbonizing fixed-bed straws. Background technique [0002] my country produces more than 900 million tons of agricultural straw every year, but less than 40% of the existing straw is used, and most of the remaining straw is discarded and burned at will, causing a large area of ​​pollution. The traditional method of returning straw to the field will cause problems such as soil compaction, intensified pests and diseases, and greenhouse gas emissions. The government put forward the concept of "recycling, full-value utilization, and step-by-step utilization", and increased the utilization rate of straw through subsidies and other means. However, due to the special characteristics of raw materials of straw, its biomass ash melting point is low, it is easy to mildew and rot, and the cellulose c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/04C05F17/00F22B1/18F26B21/14C05G3/80
CPCC05D9/00C05F17/00C05G3/80F22B1/1892F26B21/14C05F11/00C05F11/08Y02P20/129Y02W30/40
Inventor 张守军陈温福蒋剑春赵成武孟军鲁万宝孙永明李益瑞冯干吴银龙程东海张守峰白轩胡鹏孙云娟宋俊阳张政王亚军
Owner HEFEI DEBO BIOENERGY SCI & TECH
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