Solid particle material composite grading and drying device and method

Abstract

The invention relates to a solid particle material composite grading and drying device and a method. The solid particle material composite grading and drying device comprises a fluidized bed section, a movable bed section and air distribution pipes, wherein the fluidized bed section comprises an upper dilute phase zone and a lower dense phase zone, a second heater is arranged in the dense phase zone, the movable bed section is positioned under the fluidized bed section, the air distribution pipes are arranged at the bottom of the dense phase zone and provide fluidized gas to the fluidized bedsection, the movable bed section and the dense phase zone are communicated through gaps among the air distribution pipes. The solid particle material composite grading and drying device also comprises a to-be-dried material feed opening, a first material discharge opening, a second material discharge opening and a third material discharge opening, wherein the to-be-dried material feed opening is directly communicated with the dilute phase zone, the first material discharge opening is arranged on the upper part of the dilute phase zone to discharge small particle materials, the second materialdischarge opening is arranged at the dense phase zone to discharge medium particle materials, and the third material discharge opening is arranged at the lower part of the movable bed section to discharge large particle materials. The invention also relates to a solid particle material composite grading and drying method.

Description

technical field [0001] The invention belongs to the technical field of drying, in particular to the technical field of drying treatment of solid particles. Background technique [0002] Drying and grading of solid particulate fuel is an important pretreatment technology in the energy and chemical industry. [0003] Taking the coal chemical industry as an example, gasification of coal can improve the comprehensive utilization rate of coal and reduce environmental pollution. Coals with high volatile content are more suitable for gasification, such as low-rank coal and medium-rank bituminous coal, but these coals generally have high moisture content. If they are directly put into the furnace for gasification, the moisture will absorb a lot of heat when it evaporates in the furnace. Reduce the furnace temperature, reduce the calorific value of gasification products, and increase CO 2 discharge; and when the moisture content of the coal entering the furnace is higher than 8%, t...

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Problems solved by technology

[0005] Existing coal drying equipment, such as a process for preparing furnace coal from coking blended coal disclosed in Chinese patent application 200610031537.X, a fluidized bed air separation and humidity control machine and a new air selection and humidity control process disclosed in Chinese patent application 201010100808.9, Chinese patent application 200610031537.X discloses the process of preparing coking coal for furnace charging, and Chinese patent application 201010287765.X discloses a method and device for pneumatically classifying preheating and humidity adjustment of solid particle materials. The drying objects are mainly for coking plants and power plants. For high-grade coal, steam coal and coking coal, the follow-up process of drying products is mostly combustion and coking. When drying, the temperature of the drying room is relatively high. When the above processes are used for fuels with high volatile content, a large amount of volatilization will occur. The calorific value of the gasification product will be lost due to the analysis, and at the same time, there is a hidden danger of fire and explosion due to the analysis of volatilization

[0006] The multi-effect superheated steam lignite pre-drying system and its process published in Chinese patent application 200910015752.4 and the superheated steam lignite pre-drying device and its process disclosed in Chinese patent application 200910015753.9, in order to provide superheated steam required for drying, additional steam parameters need to be equipped in the system High boiler, complicated system process, high equipment investment

Chinese patent application 200610069005.5 discloses a highly volatile pulverized coal rotary drying process, which mainly uses mechanical energy as the direct power source for wet coal transportation in the dryer, and uses hot blast stove gas and coking waste gas as drying heat sources, which consumes a lot of energy. It also does not have the function of realizing the separate output and utilization of materials of various particle sizes through pneumatic classification

[0007] Existing technology can no longer meet the growing coal chemical process requirements

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