Method of movably gasifying straw in batches with fixed beds to prepare tar and returning ash to field

Abstract

The invention discloses a method for movably gasifying straw in batches with fixed beds to prepare tar and returning ash to field, and belongs to the field of comprehensive recycling of agricultural resources. According to the method, the fixed beds are loaded with a mobile vehicle to directly operate wheat straw produced after harvesting in field, the straw does not need to be crushed, updraft fixed bed gasifiers mature in technology are directly inputted in batches to prepare the tar, feeding, gasification and gas production gas-solid separation devices are omitted, the problems of utilization limitation due to a large amount of tar produced in conventional gasification, complicated requirements for straw pyrolysis and low industrial practical practicability are solved, the single gasifier realizes comprehensive and multi-stage utilization of straw products and energy, the multiple gasifiers run parallelly and alternatively, equipment is shared and arranged simply, energy can be mutually recycled and optimally utilized in the multiple gasifiers, straw gasification efficiency and operation efficiency are increased, the problem about recycling of agricultural straw is solved effectively and economically, and comprehensive utilization of straw is realized.

Description

technical field [0001] The invention belongs to the field of comprehensive recycling and utilization of agricultural resources, in particular to a mobile method for batch-wise gasifying biomass stalks crushed by a combine harvester in the field to produce tar and returning the gasification ash to the field. Background technique [0002] At present, with the increase of crop production in our country, the output of crop straw has increased significantly. In addition, with the improvement of rural living standards, the number of stoves burning straw has decreased greatly, resulting in a large amount of surplus straw or being abandoned on the roadside or burned on the spot. The ecological environment and life and property safety have brought great hidden dangers. Therefore, it is very urgent to research and develop straw utilization methods and technologies. [0003] Biomass liquid oil products have the advantages of environmental friendliness, high energy density, and convenie...

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Problems solved by technology

[0004] At present, there have been many researches on the production and transformation methods of mobile biomass liquid oil, but most of them have complex structure of the overall device and poor debugging controllability

Chinese invention patent (CN200510137113.7) discloses a mobile biomass liquefaction system, which can reduce the cost of raw material collection and transportation, but the reactor is a conventional fluidized bed reactor, the reaction temperature is difficult to control, and the consumption and wear are large

Chinese invention patent (CN200910170228.4) discloses a small fast-moving rapid pyrolysis device for agricultural and forestry biomass. They are all based on pyrolysis. Biomass pyrolysis has high requirements for the treatment of biomass and requires pre-treatment. There are difficult problems such as internal heat transfer of biomass and solid impurity content in pyrolysis gas. The overall structure of the device is complicated, and the technical process operation Many, high requirements, poor practical realization

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