Biomass drying method

Abstract

The invention provides a biomass drying method, and belongs to the field of biomass fuel drying. The technical problem of low power generation efficiency of an existing biomass power plant is solved.According to the biomass drying method, flue gas on the tail part of a boiler of the biomass power plant and low-pressure steam waste heat after a steam turbine does work are fully utilized, and solarenergy primary drying, primary drum drying and secondary drum drying are adopted, and clean energy is used in the whole drying process, and the environment is not polluted. A spiral material conveying channel is arranged in a solar energy pre-drying chamber, and convex pieces are arranged at intervals on a heat dissipation pipeline in the spiral material conveying channel, so that the traveling speed of biomass fuel in the material conveying channel is slowed down, the residence time is improved, the heat exchange between the biomass fuel and hot water in the heat dissipation pipeline is enhanced, and the drying efficiency is improved.

Description

technical field [0001] The invention belongs to the field of biomass fuel drying, and in particular relates to a biomass drying method, which is especially suitable for use in biomass power plants. Background technique [0002] Every year, my country produces a large amount of biomass waste, including wheat straw, rice straw, branches, leaves, bark, bagasse, sugarcane leaves, wood scraps, etc. These biomass wastes can be transported to biomass power plants as fuel sources, but currently The humidity of the collected biomass waste is too high. If it is not dried first and sent directly to the biomass boiler for combustion, the overall combustion efficiency of the biomass boiler will be very low due to the low calorific value, resulting in low power generation efficiency of the biomass power plant. . However, the flue gas at the boiler tail of the power plant and the low-pressure steam after the work of the steam turbine usually have a relatively high temperature, and the heat ...

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Problems solved by technology

[0002] Every year, my country produces a large amount of biomass waste, including wheat straw, rice straw, branches, leaves, bark, bagasse, sugarcane leaves, wood scraps, etc. These biomass wastes can be transported to biomass power plants as fuel sources, but currently The humidity of the collected biomass waste is too high. If it is not dried first and sent directly to the biomass boiler for combustion, the overall combustion efficiency of the biomass boiler will be very low due to the low calorific value, resulting in low power generation efficiency of the biomass power plant.

However, the flue gas at the tail of the boiler in the power plant and the low-pressure steam after the work of the steam turbine usually have a relatively high temperature, and the heat cannot be fully utilized, which further reduces the power generation efficiency of the power plant.

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