Biomass drying system

Abstract

The invention provides a biomass drying system, and belongs to the field of biomass fuel drying. The biomass drying system solves the technical problem that power generation efficiency of existing biomass power plants is low. The exhaust gas of a boiler tail of a biomass power plant and the waste heat of the low pressure steam after the steam turbine works are fully utilized. Solar preliminary drying, first-stage rotary drum drying, and second-stage rotary drum drying are adopted. Clean energy is adopted to the whole drying process, and no pollution is produced to the environment. A solar drying room is internally provided with a spiral material conveying channel. Lugs are arranged at a heat dissipating channel in the spiral material conveying channel at intervals. The travel speed of biomass fuel in the material conveying channel is lowered, the standing time is prolonged, heat exchange between the biomass fuel and hot water in the heat dissipating pipe is enhanced, and 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 system, 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 ...

AI Technical Summary

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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