Biomass fuel mild pyrolysis device and process

Abstract

The invention relates to a biomass fuel mild pyrolysis device and process. The device includes a housing (1) and a screw discharger (2); the upper end of the housing is provided with a material inlet, and the inner cavity of the housing is sequentially provided with a drying area, a reaction area and a feeding area from top to bottom; one side of the drying area is provided with Inclined surface (11), the upper end of the inclined surface is located below the material inlet, the lower end of the inclined surface is connected to the reaction area, and several air inlet holes are arranged on the inclined surface; the gas outlet is arranged on the shell on the other side of the drying area, and the stirring part is set on the other side of the drying area. Extend downwards and pass through the reaction zone and the feeding zone in sequence; nozzles (15) are set on the shell of the reaction zone for passing in the air flow for combustion; the lower end of the feeding zone is connected to the inlet of the screw discharger; the screw A heat exchanger (21) is arranged on the outer wall of the discharge machine. The invention can realize the integrated drying, mild pyrolysis and cooling treatment of the biomass fuel, improve the characteristics of the fuel, and is beneficial to realize the automatic operation and mobile operation of the biomass fuel processing.

Description

technical field [0001] The invention relates to biomass fuel thermal pretreatment technology, in particular to a biomass fuel gentle pyrolysis device and process. Background technique [0002] Biomass fuels generally use biomass resources such as crop stalks, agricultural product processing by-products and waste (agricultural processing residues), forestry waste (forestry processing residues) and energy crops as raw materials. Due to factors such as large seasonal fluctuations and unstable supply of straw raw materials, some biomass power plants usually consider blending coal to ensure that the generating units can provide stable power. [0003] At present, biomass direct combustion power generation is widely used, that is, direct combustion of biomass fuel for power generation. The direct combustion process mainly includes preheating and drying (moisture removal), light volatiles (CH 4 , CO, CO 2 etc.) precipitation and combustion of residual coke particles (fixed carbon...

AI Technical Summary

Problems solved by technology

The main problems in the direct combustion process of biomass fuel are as follows: 1. The water content of the raw material is high, and it takes a long time to dry and preheat at a higher temperature. The furnace and the evaporating heating surface corrode greatly; 2. The light volatile content is high, but its calorific value is relatively low, resulting in a low temperature field in the furnace after combustion, making it difficult to ensure stable combustion; 3. Light volatile combustion After exhaustion, the ashes surround the coke particles, and it is difficult for the air to contact with the coke particles, resulting in slow burning speed and difficulty in burning out.

Chinese patent 201480074767.7 discloses a torrefaction reactor transformed from a standard commercial vibrating dryer. The equipment has a complex structure and is difficult to miniaturize, and is more suitable for scenarios where biomass fuel raw materials are relatively concentrated

The existing traditional manual collection of loose rods or the use of balers to pick up and bundle them in the field and send them to the storage point not only has high costs and low operating efficiency, but also the high moisture content of biomass fuel raw materials can easily cause raw materials to rot and deteriorate.

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