Apparatus for the preparation of biomass chars returned into field and the recovery and utilization of gas waste heat

Abstract

The invention discloses an apparatus for the preparation of biomass chars returned into field and the recovery and utilization of gas waste heat. The apparatus comprises a pneumatic feeding device, a coking chamber, a heat exchanger, a purifier, a carbon filter and a water-seal flame arrester, which are connected in sequence via a gas transmission pipeline. Clean and dry combustible gas is finally obtained after high temperature combustible gas mingled with dust, water vapor and tar gas, which is generated during the burning of biomass in the above apparatus, are subjected to primary cooling in the heat exchanger, secondary cooling and separation in the purifier and tertiary adsorption and separation in the carbon filter. Then the clean and dry combustible gas is fed into the water-seal flame arrester to be prevented from temper and back burning. The apparatus provided by the invention is applicable to further preparation of biochar fertilizer to be returned into field. Clean and dry combustible gas is obtained after the cooling, purification and filtering of high temperature combustible gas by means of the above primary, secondary and tertiary cooling and purification devices. Hot water obtained by heat exchange can be used for the special aquaculture of greenhouse soft-shelled turtles. Tail gas discharged out of the apparatus meets the requirement of environment protection.

Description

Technical field [0001] The invention relates to a device for preparing biomass charcoal (especially straw biomass charcoal) used for returning to the field and recycling and utilizing waste heat of gas, and belongs to the technical field of biomass thermochemical conversion. Background technique [0002] my country’s biomass resources are very rich. According to statistics, the annual output of all kinds of straws in the country alone amounts to 700 million tons. Except for a small amount of them used for feed, fuel and industrial raw materials, most of them are discarded and incinerated. 100 million tons of straw are burned in the field, causing waste of resources and serious air pollution. In recent years, the country has paid more and more attention to the use of biomass as energy, and vigorously carried out research on the solidification, gasification and liquefaction of biomass. However, due to the diversity and complexity of biomass, the use of biomass as energy is still Lo...

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