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Two-stage continuous lignite upgrading system

A lignite, tunnel-type technology, applied in the petroleum industry, solid fuel, fuel, etc., can solve the problems of reducing calorific value, pollution, and high temperature, and achieve the effect of low cost and low energy consumption

Inactive Publication Date: 2015-03-04
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In recent years, some lignite upgrading methods have been developed, such as heat treatment modification, hydrothermal modification (HTD), mechanical thermal compression modification (MTE) and dehydration hot pressing upgrading (HPU), but due to high energy consumption Moreover, the temperature is too high, which causes the precipitation of small molecules such as tar in coal, reduces its calorific value, and causes pollution. It is still difficult to promote large-scale industrial applications

Method used

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  • Two-stage continuous lignite upgrading system
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  • Two-stage continuous lignite upgrading system

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specific Embodiment approach

[0017] Two-stage continuous lignite upgrading system of the present invention, its preferred embodiment is:

[0018] It includes an air fluidized bed pre-drying system and a microwave enhanced upgrading system, and the lignite treated by the air fluidized bed predrying system is sent to the microwave enhanced upgrading system through a conveyor belt for microwave irradiation treatment;

[0019] The air fluidized bed pre-drying system includes an air fluidized bed, a heater is provided on the circulating air duct of the air fluidized bed, and an air compressor, a constant pressure air bag, a valve, and a flow meter connected in sequence are also included. The outlet of the flow meter is connected with the circulating air duct of the air fluidized bed through the heater;

[0020] The microwave-enhanced upgrading system includes a tunnel-type microwave upgrader, and energy suppressors are arranged at the inlet and outlet of the box of the tunnel-type microwave upgrader.

[0021]...

specific Embodiment

[0052] See attached Figure 1-3 , the method includes an air fluidized bed pre-drying system, a microwave enhanced upgrading system and a conveyor belt 15 for carrying and transporting materials.

[0053] The specific implementation process of the above method is as follows:

[0054] The air compressor 6 blows fresh air into the constant-pressure wind bag 5, and the appropriate air flow is controlled through the valve 4, and its size is monitored by the flow meter 3. The air enters the fluidized bed 1 after being heated by the heater 2, so that the lignite in the fluidized bed 1 is fluidized, and the rapid and efficient pre-drying of the lignite is realized.

[0055] After the lignite is pre-dried in the first stage, it reaches the state of critical water content, and enters the tunnel-type upgrader 7 along with the conveyor belt for second-stage microwave enhanced upgrading. The structure of entering the microwave upgrader leveler 18 is as follows figure 1 Shown: A steel p...

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Abstract

The invention discloses a two-stage continuous lignite upgrading system, comprising an air fluidized bed pre-drying system and a microwave-enhanced upgrading system, wherein lignite treated by the air fluidized bed pre-drying system is fed into the microwave-enhanced upgrading system through a conveying belt for microwave irradiation treatment; the air fluidized bed pre-drying system comprises an air fluidized bed; a circular air duct of the air fluidized bed is provided with a heater; the air fluidized bed pre-drying system further comprises an air compressor, a constant pressure air bag, a valve and a flowmeter, and the outlet of the flowmeter is connected with the circular air duct of the air fluidized bed through the heater; the microwave-enhanced upgrading system comprises a tunnel type microwave upgrading device, and energy suppressors are arranged at the inlet and the outlet of the box body of the tunnel type microwave upgrading device. The system can be used for drying and upgrading lignite by the combined action of first-section air fluidized bed pre-drying and second-section microwave-enhanced upgrading and has the advantages of low cost, low energy consumption, high lignite drying efficiency, continuous production and the like.

Description

technical field [0001] The invention relates to a lignite upgrading system, in particular to a two-stage continuous lignite upgrading system. Background technique [0002] Lignite is a widely used solid raw fuel and is widely used in heating, power generation and chemical industries. However, due to its high content of water and ash, the low calorific value of the received base is low, and it is prone to weathering and deterioration and spontaneous combustion after being exposed to the air for a long time, resulting in the loss of product coal. These unfavorable factors together reduce its utilization space and improve cost of its use. Therefore, exploring lignite upgrading methods can expand the utilization space of lignite, reduce its loss in the process of utilization, improve its utilization efficiency, and have high economic value for its application. [0003] In recent years, some lignite upgrading methods have been developed, such as heat treatment modification, hyd...

Claims

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Application Information

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IPC IPC(8): C10L9/08
Inventor 徐志强杨虓王卫东王楠
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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