Two-section type pyrolysis-gasification revolving bed for biomass and pyrolysis gasification method

Abstract

The invention relates to a two-stage biomass pyrolysis gasification rotary bed and a pyrolysis gasification method. The shell of the rotating bed is ring-shaped, and the shell includes a furnace roof, a circumferential furnace wall and a furnace pan. The furnace roof and the circumferential furnace wall are fixedly connected, and the furnace pan can rotate horizontally relative to the furnace roof and the circumferential furnace wall; The furnace is divided into two sections along the circumference: the first gasification section and the second gasification section, both of which include a drying zone, a pyrolysis zone, an oxidation zone and a reduction zone connected in sequence in the circumferential direction, and the reduction zone of the first gasification section and the The drying area of ​​the second gasification section is connected with a first partition, the reduction area of ​​the second gasification section is connected with the drying area of ​​the first gasification section and a second partition is provided; The first air inlet, the second air inlet, the first gasification gas outlet, the second gasification gas outlet, the first feed port, the second feed port, the first ash outlet, and the second ash outlet. The invention improves the productivity of the gasification furnace and the quality of the pyrolysis gas, and realizes the continuous feeding and operation on the disk.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a two-stage biomass pyrolysis gasification rotary bed and a pyrolysis gasification method. Background technique [0002] The world's annual biomass production is 146 billion tons, and biomass has become the fourth largest energy source in the world. Compared with traditional fossil energy, biomass energy has the advantages of lower sulfur oxide (SOx), nitrogen oxide (NOx) output and zero net emission of carbon oxide (COx) in use. There are a variety of biomass conversion technologies. Among them, the pyrolysis method can produce gas, liquid and solid three-phase energy products from biomass, which has attracted attention at home and abroad in recent decades, so that it can replace petroleum energy and alleviate modern Dependency of energy use on oil. [0003] According to the furnace structure, biomass pyrolysis gasification can be divided into three types: fix...

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Problems solved by technology

[0006] The fixed-bed gasifier relies on the gravity of the biomass itself to carry out the gasification reaction from top to bottom. Due to the small bulk density of the biomass, the fixed-bed gasifier has a small production capacity, and the reaction rate cannot be controlled artificially. The degree of automation is low. Difficult to apply to large-scale continuous industrial production

[0007] During the operation of the fluidized bed, a large amount of fly ash will be generated, and the fly ash will accumulate under long-term work, resulting in reduced heat transfer efficiency and secondary pollution, and affecting pyrolysis efficiency

[0008] The feeding / discharging mechanism is set in the fluidized bed furnace body, which will cause damage due to material friction and collision with the feeding / discharging mechanism, increasing the number of maintenance; and destroying the gas flow in the fluidized bed, resulting in unstable operation of the fluidized bed

[0009] The biochar produced by the equipment is not fully utilized, and the pursuit of carbon production leads to incomplete volatile reaction, resulting in the inability of pyrolysis gas to be self-sufficient, and the need to supplement fossil energy

[0010] Therefore, in order to solve the problems of low efficiency, uncontrollable reaction rate, and low degree of automation of pyrolysis and gasification in existing gasifiers, it is necessary to propose a method that is easy to manufacture, low in cost, simple and controllable in operation, and capable of continuous high-intensity operation. A two-stage biomass pyrolysis direct gasification rotating bed device and method

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