Device and method for preparing straw biochar by waste heat of high temperature thermal desorption

Abstract

The invention discloses a device and method for preparing straw biochar by waste heat of high temperature thermal desorption. The device includes a biochar carbonization kiln, a conveying frame and amixture blending device. A fixing frame is welded to the outer surface of the biochar carbonization kiln, and an inner cavity of the biochar carbonization kiln is provided with an inner cylinder. Thewhole device uses waste heat of soil after thermal-desorption remediation and added straw for synthesizing charcoal, and the characteristics of soil are greatly improved. One end of each second thermal insulation board is arranged at a connection clamp cavity of the corresponding first thermal insulation board through clamping, thus every two adjacent second thermal insulation board and first thermal insulation board are closely connected, heat loss is reduced to the utmost extent, and the environmental condition of biochar preparation is improved. The straw enters a material stirring frame through a sealed material blending hopper, a grinding roller is used for stirring, the straw is crushed better before entering the inner cylinder, and moreover, the situation is avoided that the agglomeration, due to long-time storage, of the straw affects the carbonization process of biochar.

Description

technical field [0001] The invention relates to the technical field of biochar preparation, in particular to a device and method for preparing straw biochar by using high-temperature thermal desorption waste heat. Background technique [0002] At present, organic pollutants in soil are mainly remediated by thermal desorption technology. As a physical remediation method, thermal desorption technology has the advantages of wide pollutant treatment range, high treatment rate, short remediation period, low cost, movable equipment, reusable soil after remediation, etc. The remediation target can be achieved at one time, and the desorption rate of general organic pollutants can reach more than 90%. Especially for chlorine-containing organic compounds such as PCBs, the non-oxidative combustion treatment method can significantly reduce the generation of dioxins and avoid secondary pollution. However, when the temperature of the thermal desorption drum is higher than 287 ° C, the T...

AI Technical Summary

Problems solved by technology

Especially for chlorine-containing organic compounds such as PCBs, the non-oxidative combustion treatment method can significantly reduce the generation of dioxins and avoid secondary pollution. However, when the temperature of the thermal desorption drum is higher than 287 ° C, the The natural organic matter in the soil can be decomposed and destroyed. At 385-485°C, the humus will produce thermal decomposition products (such as alkanes, phenols, and polycyclic aromatic hydrocarbons), which will cause a large loss of soil organic matter, resulting in a decrease in the fertility of the restored soil. If the soil is damaged, the sustainability of the soil is even worse. On the other hand, the residual temperature of the soil is still high after being repaired by high-temperature thermal desorption technology. It needs to enter the cooling system to cool down, and finally enter the discharge system to complete the repair process

Restoration projects generally have a large amount of work, resulting in a large amount of waste heat resources that cannot be effectively utilized and are wasted

Images