Method for preparing straw biochar by hydrothermal carbonization

A hydrothermal carbonization and straw biotechnology, which is applied in the preparation/purification of carbon, can solve the problems of ineffective resource utilization of agricultural and forestry wastes, low degree of resource utilization of agricultural and forestry wastes, and small scale of comprehensive utilization enterprises. Improve comprehensive utilization and economic benefits, improve soil and fertilizer efficiency, and save pretreatment costs

Inactive Publication Date: 2019-11-05
厦门丰同科技有限公司
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  • Description
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  • Application Information

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Problems solved by technology

But generally speaking, the degree of resource utilization of agricultural and forestry waste is low, the scale of comprehensive utilization enterprises is small, lack of backbone enterprises to drive, and the development of industrialization is slow
A considerable part of agricultural and forestry waste has not been effectively utilized as a resource, which not only wastes resources, but also causes environmental pollution. Random stacking and disorderly burning of crop straw have become the most difficult problems in the government's control of air quality and rural environmental governance.

Method used

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  • Method for preparing straw biochar by hydrothermal carbonization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] like figure 1 As shown, the preparation of straw biochar by hydrothermal carbonization is prepared according to the following steps:

[0044] Step 1. Recycling of tangerine stalks: after harvesting, recycle the remaining stalks.

[0045] Step 2, crushing of straw: crushing the straw to obtain small particles and small blocks of raw materials (less than 3 cm in length), which are stored for later use.

[0046] Step 3. Hydrothermal carbonization of straw: mix the straw with water, introduce it into a hydrothermal carbonization reaction tank, ensure that the hydrothermal carbonization reaction tank is airtight, and heat for hydrothermal carbonization reaction. The hydrothermal reaction temperature is 200-270°C and the pressure is 5-30bar , the reaction time is 1.5-3h, and the ratio of straw raw material to water to solid to liquid is 10:2.

[0047] Step 4, filtration and separation of solid and liquid phase products: after the hydrothermal carbonization process ends, sto...

Embodiment 2

[0055] With reference to embodiment 1, different from embodiment 1 is:

[0056] Dry corn stalks after reaction conditions: temperature 270°C, pressure 10bar, time 2hr

[0057] Corn stalks before reaction: 8.01% ash, 75% moisture, calorific value 2670Kcal / kg

[0058] Corn carbon after reaction: ash content 7.15%; water content 38%, calorific value 5534kcal / kg

[0059] After the reaction, the ash content is reduced by about 1%, the water content is reduced by about 50%, and the calorific value is about doubled.

Embodiment 3

[0061] With reference to embodiment 1, different from embodiment 1 is:

[0062] Wet wheat straw after reaction conditions: temperature 250°C, pressure 20bar, time 2hr

[0063] Wheat stalk before reaction: 8.45% of ash, 82% of water content, 2574Kcal / kg of calorific value

[0064] Wheat carbon after reaction: ash content 7.61%; water content 40%, calorific value 5074kcal / kg

[0065] After the reaction, the ash content is reduced by about 1%, the water content is reduced by about 50%, and the calorific value is about doubled.

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Abstract

The invention discloses a method for preparing straw biochar by hydrothermal carbonization. The method comprises the following steps that S1, straw is crushed and mixed with water, wherein the solid-liquid ratio of the straw to the water is (10:5)-(20:1); S2, the mixture is introduced into a hydrothermal carbonization reaction tank for a hydrothermal carbonization reaction; S3, a product of the hydrothermal carbonization reaction is cooled, filtered, separated and dried to obtain the straw biochar. The method has the advantages that a new straw recycling mode is provided, the process is simple, the potential of carbon fixation and emission reduction is increased, and the comprehensive utilization rate and economic benefit of the straw are increased.

Description

technical field [0001] The invention relates to the technical field of biochar preparation, in particular to a method for preparing straw biochar by hydrothermal carbonization. Background technique [0002] Biochar is a solid by-product of low-temperature thermal conversion of biomass under anaerobic or microaerobic conditions. It is a material with high organic carbon content, porosity, alkalinity, strong adsorption capacity, and multi-purpose. In recent years, biochar has attracted much attention as a soil improver, fertilizer slow-release carrier and carbon sequestration agent. Biochar can sequester and fix carbon in the soil for hundreds to thousands of years. Biochar can also improve the physical and chemical properties of soil and the activity of microorganisms, improve soil fertility, delay the release of fertilizer nutrients, reduce the loss of fertilizer and soil nutrients and Reduce soil pollution. There are many beneficial effects of using agricultural waste bio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05
CPCC01B32/05
Inventor 蔡庆瑞
Owner 厦门丰同科技有限公司
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