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Pyrolysis method for low-rank coal or oil shale with higher tar yield

A low-rank coal and oil shale technology, applied in the field of low-rank coal or oil shale pyrolysis upgrading, can solve the problems of low tar yield and high dust content in tar

Inactive Publication Date: 2015-11-04
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Low tar yield and high dust content in tar are the core problems in the upgrading process of low-rank coal or oil shale. Therefore, the traditional low-rank coal and oil shale pyrolysis methods need to be improved urgently

Method used

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  • Pyrolysis method for low-rank coal or oil shale with higher tar yield
  • Pyrolysis method for low-rank coal or oil shale with higher tar yield
  • Pyrolysis method for low-rank coal or oil shale with higher tar yield

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1 shows the opinion figure 1 . The material is long flame coal. Combustion chamber 1 (hot end), carbonization chamber 2 and gas collection chamber 3 (cold end) combined units are arranged separately. In this moving bed reactor, the distance between the cold and hot ends is 50cm, the coal material moves from top to bottom, and the gas heat carrier penetrates the coal material in the carbonization chamber 2 radially from the combustion chamber 1 (hot end) and enters the gas collection In chamber 3 (cold end), the heat carrier gas and coal material undergo rapid gas-solid heat exchange, and the temperature of the gas heat carrier is rapidly cooled from 800°C to 120°C. The coal material is heated to undergo low-temperature pyrolysis, and the heating rate of the coal material is between 50°C / min and 600°C / min. The temperature gradient between the cold end and the hot end is 800°C / m. The oil-gas mixture produced by pyrolysis is led out from the gas collection cham...

Embodiment 2

[0015] Example 2 shows the opinion figure 2 . The material is lignite. Combustion chamber 1 (hot end), carbonization chamber 2 and gas collection chamber 3 (cold end) combined units are arranged on the same side. In this moving bed reactor, the distance between the cold and hot ends is 60cm, the coal material moves from top to bottom, and the gas heat carrier penetrates the coal material in the carbonization chamber 2 radially from the combustion chamber 1 (hot end) and enters the gas collection In chamber 3 (cold end), the heat carrier gas and coal material undergo rapid gas-solid heat exchange, and the temperature of the gas heat carrier is rapidly cooled from 800°C to 120°C. The coal material is heated to undergo low-temperature pyrolysis, and the heating rate of the coal material is between 50°C / min and 500°C / min. The temperature gradient between the cold end and the hot end is 700°C / m. The oil-gas mixture and heat carrier gas produced by pyrolysis enter the gas colle...

Embodiment 3

[0017] Example 3 shows the opinion image 3 . The material is oil shale. Combustion chamber 1 (hot end), carbonization chamber 2 and gas collection chamber 3 (cold end) combined units are arranged in opposite sides. In this moving bed reactor, the distance between the cold and hot ends is 60cm, the coal material moves from top to bottom, and the gas heat carrier penetrates the coal material in the carbonization chamber 2 radially from the combustion chamber 1 (hot end) and enters the gas collection In chamber 3 (cold end), the heat carrier gas and coal material undergo rapid gas-solid heat exchange, and the temperature of the gas heat carrier is rapidly cooled from 800°C to 120°C. The coal material is heated to undergo low-temperature pyrolysis, and the heating rate of the coal material is between 50°C / min and 500°C / min. The temperature gradient between the cold end and the hot end is 700°C / m. The oil-gas mixture and heat carrier gas produced by pyrolysis enter the gas col...

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Abstract

The invention relates to a pyrolysis method for low-rank coal or oil shale with higher tar yield, and is suitable for a heat upgrading process of a low-rank coal moving bed with the purpose of obtaining high-yield tar. The method is a gas heat carrier technology, high-temperature gas flows to the cold end of a collection chamber from a combustion chamber at the hot end of a carbonization chamber by traversing a coal material, quick gas-solid heat exchange between hot carrier gas and the coal material is performed, and the coal material is heated to perform low-temperature pyrolysis. A gas-oil mixture generated by pyrolysis, together with the hot carrier gas, is introduced by the collection chamber at the cold end of the carbonization chamber. The pyrolysis method is characterized in that oil gas and a hot carrier generated by pyrolysis quickly pass through the coal material with the average radial temperature gradient of 600 DEG C / m, and flow to a low-temperature area from a high-temperature area, so that obvious secondary splitting is avoided in time. On the other hand, the method adopts the gas hot carrier to radially penetrate a coal layer, and heat is transferred to the internal coal material at a short transverse distance by the hot carrier, so that the material layer resistance can be obviously reduced, pulverization and semi-coke bringing is reduced, and the heat transfer efficiency is improved.

Description

technical field [0001] The invention relates to a low-rank coal or oil shale pyrolysis method with relatively high tar yield, belongs to the technical field of chemical industry, and particularly relates to low-rank coal or oil shale pyrolysis upgrading technology. Background technique [0002] Low-rank coal (long-flame coal, lignite, non-caking coal, weakly caking coal) and oil shale pyrolysis upgrading is one of the effective means to achieve high-efficiency utilization of low-rank coal. However, in the existing pyrolysis process, the main problems are: the traditional gas heat carrier pyrolysis process, the countercurrent movement of the material and the carrier gas, the thickness of the material is relatively large, due to the thermal fragmentation and pulverization of low-rank coal and oil shale characteristics, the pressure drop of the bed is greatly increased, and it is difficult for the heat carrier to pass through the material, so a faster pyrolysis process cannot b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B53/00C10B53/06C10B49/06
Inventor 初茉郭二卫曲洋
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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