Lignite drying fluidized bed equipment and system

Abstract

The invention discloses lignite drying fluidized bed equipment and a lignite drying system. The lignite drying fluidized bed equipment is provided with standard modules which are spliced into a complete bed body, and the bed body inclines from the feeding end to the discharging end. Each standard module comprises grid plates, a movable pushing system, linear bearing supporting devices, a hydraulic pushing device and wear-resistant sealing protection parts, wherein the grid plates are fixed and spliced into a grid bed for bearing materials; the movable pushing system comprises movable trolleys and pushing bars; the hydraulic pushing device drives the movable trolleys which are used for driving the pushing bars; and the pushing bars are located above the grid bed and kept spaced from the grid bed by a certain distance, so that a relatively fixed charge layer is maintained between the pushing bars and the grid bed. According to the lignite drying fluidized bed equipment and the lignite drying system, the grid plates are fixed and are not prone to deformation to fall off or leakage to cause air play, and as the charge layers are arranged between the pushing bars and the grid plates for buffering, the service life of the equipment is better guaranteed.

Description

technical field [0001] The invention belongs to the technical field of lignite drying air pollutant emission control, and in particular relates to a novel fluidized bed equipment and system for drying lignite. Background technique [0002] In the current era of energy diversification, coal will still occupy an important position for a long period of time. At present, high-calorific-value bituminous coal and anthracite are mainly used as coal, but in recent years, the use of lignite has been expanding in order to expand the field of energy supply as part of long-term energy supply. [0003] Because lignite is rich in volatiles, it burns easily and gives off smoke. Its carbon content is 60% to 77%, and its density is about 1.0-1.2g / cm 3 . Low-level calorific value is generally only 11.71-16.73MJ / kg, and high-level calorific value of constant humidity ash-free base is about 23.0-27.2 MJ / kg (5500-6500 kcal / kg). Mostly brown or brown-black, relative density 1.2~1.45g / cm 3 . ...

AI Technical Summary

Problems solved by technology

my country's lignite generally has disadvantages such as high humidity (about 30% to 50%), low ignition point, and large carbon dioxide emissions. Direct combustion of unupgraded lignite raw coal will cause serious environmental pollution.

If it is used for power generation, it will increase the construction and operation cost of the power plant, and the higher water content will lead to an increase in transportation costs, which limits the space for lignite resources to be transported to coastal cities for power plants.

At the same time, the power generation efficiency of lignite is low, and the carbon dioxide emission is relatively large, which seriously limits the application of lignite.

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