Biomass double-shaft screw pyrolysis device

Abstract

The invention discloses a biomass double-shaft screw pyrolysis device. The biomass double-shaft screw pyrolysis device comprises a hollow cylindrical enclosure with a U-shaped cross section, wherein an opening of the hollow cylindrical enclosure is sealed by a seal cover of a machine cover, thereby forming a sealed reaction region; the reaction region formed in the enclosure in the axial direction is sequentially divided into a plurality of individual pyrolysis sub regions; the cylinder wall of the enclosure is of a hollow sandwiched structure so as to act as a flue gas channel; the enclosure is centrally provided with double-shaft screw packing augers which penetrate through the reaction region axially; the rotation directions of the two packing augers are opposite; biomass entering from a biomass inlet is mixed and conveyed by the double-shaft screw packing augers, is baked in the baking sub regions sequentially, and is respectively subjected to catalytic gasification and reforming in gasification sub regions and reforming sub regions, so that high-quality synthesized gas products are generated and are discharged from a pyrolysis gas outlet. The biomass double-shaft screw pyrolysis device intensifies the material mixing and heat transferring and mass transferring effects; biomass is gasified efficiently by adopting the inner and outer thermal combination and catalytic effect, so that the problem of axial and radial breathing of the screw pyrolysis device in running at high temperature is solved.

Description

technical field [0001] The invention belongs to the field of a biomass pyrolysis gasification device for preparing synthesis gas, and in particular relates to a biomass double-helix pyrolysis device. Background technique [0002] Among many biomass energy utilization technologies, compared with other technologies, thermochemical conversion technology has the advantages of wide adaptability of raw materials and easy large-scale production. Biomass pyrolysis gasification to produce synthesis gas (with H 2 and CO as the main components of raw material gas), and then synthesize a variety of chemical products (such as ammonia, CH 3 OH, chain hydrocarbons or other fine chemicals, etc.) is one of the most promising approaches to resource utilization of biomass energy in thermochemical conversion technology. The core equipment in the synthesis gas production process of biomass pyrolysis gasification is the gasification reactor, and its structure, form and operating parameters have...

AI Technical Summary

Problems solved by technology

The fixed bed has simple structure, convenient operation, and low investment. It has become the main gasification reactor, but it has small processing capacity, poor heat transfer effect in the furnace body, low gasification efficiency, more ash and tar in the gas, and it is difficult to accurately control the gas. Insufficient products, etc.; fluidized bed and entrained bed gasification devices can effectively increase the processing scale and realize continuous production, but fluidized bed reactors generally need follow-up equipment to deal with problems such as tar and recombined synthetic gas. The grinding requirements of biomass raw materials are too high, so the device system is complicated, the operation is cumbersome, and the energy consumption is large

[0004] The spiral gasification reaction device is conducive to the stable operation of the raw material continuous conveyor, but the heat and mass transfer of the material under the current screw shaft is poor, and the expansion and contraction and sealing characteristics of the gasification equipment at high temperatures need to be improved

At the same time, the conventional gasification technology is mostly internal heating biomass gasification, that is, a limited amount of air is introduced into the gasifier, and the unburned biomass is directly heated and gasified by the heat energy generated by the combustion of biomass itself in the air, but the gas product Contains a lot of N 2 and CO 2 Seriously affected the gas quality of the synthesis gas, unable to meet the requirements of subsequent applications

Although the oxygen-enriched / steam gasification method used in the internal thermal gasification technology can help improve the quality of the syngas, it needs to increase the oxygen production equipment, steam generator and superheating equipment, which requires a high initial investment, and the system is relatively independent and stable. Difference

Images