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Quick pyrolysis technology for coal

A pyrolysis and rapid technology, applied in the field of coal pyrolysis, can solve the problems of slow heat and mass transfer of cold and hot materials, uneven distribution of internal temperature field, slow heating rate, etc. The effect of fast heat and mass transfer

Active Publication Date: 2015-12-23
BEIJING HUASHI UNITED ENERGY TECH & DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that in the prior art, a fluidized bed pyrolysis reactor is used for coal pyrolysis reaction, and the heat and mass transfer of the cold and hot materials inside the reactor is relatively slow, resulting in uneven distribution of the internal temperature field and a rise in temperature. The rate is relatively slow, part of the raw coal flows out of the reactor before the pyrolysis reaction occurs, and the tar yield is relatively low. Therefore, a rapid coal rapid heat transfer method that can realize rapid heat and mass transfer of cold and hot materials, fast pyrolysis, and high tar yield is proposed. Pyrolysis process

Method used

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  • Quick pyrolysis technology for coal

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Effect test

Embodiment 1

[0030] This embodiment provides a coal rapid pyrolysis reaction device for performing the coal rapid pyrolysis process, which is provided with a straight tube pyrolysis section 21, and the bottom of the straight tube pyrolysis section 21 is provided with a crude gas inlet, The lower part is provided with a coal inlet and a high-temperature carrier inlet, and the top is provided with a discharge port; the length-to-diameter ratio of the straight tube pyrolysis section 21 is 30:1;

[0031] Based on the coal fast pyrolysis process of described coal fast pyrolysis reaction device, concrete steps are as follows:

[0032] The raw coal with a particle size of 0-30mm is sent to the straight tube pyrolysis section 21, mixed with a high-temperature carrier at 900°C, and dry-distilled under the fluidization of crude gas; in the straight tube pyrolysis section 21, the The rising speed of the crude gas is 6m / s, the temperature in the straight pipe pyrolysis section 21 is 550°C, and the mas...

Embodiment 2

[0035] This embodiment provides a coal rapid pyrolysis reaction device for performing the coal rapid pyrolysis process, which includes a straight pipe pyrolysis section 21 and a gas-solid separation chamber 23 .

[0036] The bottom of the straight tube pyrolysis section 21 is provided with a crude gas inlet, the lower part is provided with a coal inlet and a high-temperature carrier inlet, and the top is provided with a discharge port; the length-to-diameter ratio of the straight tube pyrolysis section 21 is 20:1 ;

[0037] The gas-solid separation chamber 23 is located above the straight pipe pyrolysis section 21, and is connected to the upper end of the straight pipe pyrolysis section 21. The lower part of the gas-solid separation chamber 23 is a stripping section 22. The cross-section of the stripping section 22 tends to increase from bottom to top; an exhaust port is provided on the upper part of the gas-solid separation chamber 23, and a solid outlet is provided at the bo...

Embodiment 3

[0044] This embodiment provides a coal rapid pyrolysis reaction device for performing the coal rapid pyrolysis process, its structure is as follows figure 1 As described above, the sequentially connected arrangement includes: a raw coal preheater 1, a coal rapid pyrolysis reaction device 2, a burner 3, a separation and dust removal device, and a spray purification unit 6.

[0045] The raw coal preheater 1 is used to preheat the raw coal. The top of the raw coal preheater 1 is provided with a raw coal input port, the bottom is provided with a high-temperature flue gas input port, the lower part is provided with a coal outlet, and the upper part is provided with a Flue gas output port; upstream of the raw coal preheater 1, it is sequentially connected with the raw coal input port of the raw coal preheater 1, and is provided with a crushing chamber 11, a sorting chamber 12, and a particle size adjustment chamber 13, which are used for preheating. The raw coal is screened; downstr...

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Abstract

The invention provides a quick pyrolysis technology for coal. Feed coal with the particle size of 0-50 mm is firstly fed into a straight tube pyrolysis section with the length-diameter ratio being 40:1, mixed with a high-temperature carrier with the temperature of 850-950 DEG C and subjected to dry distillation under fluidization of raw gas, wherein the rising speed of the raw gas ranges from 2 m / s to 8 m / s. Thus, when the pyrolysis technology is used for conducting coal pyrolysis treatment, heat and mass transfer of cold materials and hot materials can be achieved, pyrolysis is quick, the whole pyrolysis process is controlled to be within 10-30 s, the utilization rate of raw materials is up to 100%, and the tar yield is high.

Description

technical field [0001] The invention relates to a coal rapid pyrolysis process, which belongs to the technical field of coal pyrolysis. Background technique [0002] The salient features of my country's energy resources are rich in coal, low in oil and short of gas. However, at present, coal resources are often used for a single purpose, most of which are mainly for direct combustion, and other gasification and liquefaction are also mainly for a single process. The direct combustion of coal simply uses coal as fuel, and cannot effectively utilize the high-value components contained in coal; and in the individual conversion processes such as coal gasification and liquefaction, the reaction rate of solid particles decreases with the increase of conversion degree. Slow, in order to obtain a higher conversion efficiency, measures must be taken to convert the part that is difficult to convert, which leads to complex technology, huge equipment, high investment and production cost...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B49/22C10B53/04C10B57/10
Inventor 李林李春桃路阳
Owner BEIJING HUASHI UNITED ENERGY TECH & DEV
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