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Fluidized bed low-temperature destructive distillation system and low-temperature destructive distillation method of low-rank coal

A low-rank coal and low-temperature technology, which is applied in the direction of special carbonization, direct heating carbonization, and combustible gas purification, can solve the problems of difficult ash removal of large particles, complex equipment structure, and low volume utilization of bubbling bed reactors.

Inactive Publication Date: 2014-08-27
CHINA COAL ENERGY HEILONGJIANG COAL CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent 200810012528.5 discloses a fluidized bed low-temperature carbonization process based on petroleum catalytic cracking technology. The carbonization reactor adopts petroleum catalytic cracking reactor and collects fine powder through internal cyclone. The equipment structure is relatively complicated
Patent 200810028510.4 discloses a low-temperature dry distillation process based on a bubbling bed fluidized bed reactor. The volume utilization rate of the bubbling bed reactor is low, there is no ash discharge pipe at the bottom, and it is difficult to discharge large particles of ash

Method used

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  • Fluidized bed low-temperature destructive distillation system and low-temperature destructive distillation method of low-rank coal
  • Fluidized bed low-temperature destructive distillation system and low-temperature destructive distillation method of low-rank coal
  • Fluidized bed low-temperature destructive distillation system and low-temperature destructive distillation method of low-rank coal

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Embodiment 1

[0059] Adopt the fluidized bed low-temperature dry distillation system shown in the figure of the present invention, the diameter of the fluidized bed drying preheater is 200mm, and the height is 3000mm; the inner diameter of the upper straight pipe section of the low-temperature dry distillation reactor is 50mm, the inner diameter of the lower expanded section is 80mm, and the total height is 12000mm; The bed gasifier has a diameter of 200mm and a height of 4000mm. The raw coal is Yilan Grade 6 coal, and the coal quality analysis data are shown in Table 1.

[0060] First, the raw coal is crushed and screened, and the pulverized coal with a particle size of less than 8mm is sent to the drying preheater 4 through the coal hopper 1 and the feeder 2, and the temperature is controlled at 180-210°C for drying and preheating;

[0061] Put the preheated coal powder into the carbonization reactor 8, mix the hot gas 20 from the gasifier with the circulating cold gas 26, adjust the temp...

Embodiment 2

[0071] The fluidized bed low-temperature dry distillation device and operation steps are the same as those in Example 1. The raw coal is Yilan Grade 6 coal, and the coal quality analysis data are shown in Table 3. The raw coal particle size is controlled to be less than 8mm, the coal drying preheating temperature is 200-230°C, the low-temperature carbonization temperature is 520-550°C, the gasification temperature is 1000-1050°C, and other operating conditions are the same as in Example 1. The dry distillation hot gas is composed of: H 2 content 13-16%, CO content 11-14%, N 2 Content 45~48%, CH 4 Content 1~2%, CO 2 Content 8 ~ 12%, H 2 The O content is 14-16%. The yield of low-temperature dry distillation tar is 12.3%, the yield of semi-coke is 66.0%, and the specific gravity of low-temperature tar is 1.21g / ml. The semi-coke properties and the distillation range analysis of tar are shown in Table 3 and Table 4.

[0072] Table 3 Work points and element points data of the...

Embodiment 3

[0077] The fluidized bed low-temperature dry distillation device and operation steps are the same as those in Example 1. The raw coal is Yilan 32 rank coal, and the coal quality analysis data are shown in Table 5. The raw coal particle size is controlled to be less than 8mm, the coal drying preheating temperature is 200-230°C, the low-temperature carbonization temperature is 500-520°C, the gasification temperature is 1000-1050°C, and other operating conditions are the same as in Example 1. The dry distillation hot gas is composed of: H 2 content 10-14%, CO content 10-12%, N 2 Content 48~50%, CH 4 Content 0~1%, CO 2 Content 10-12%, H 2 O content 12-15%. The yield of low-temperature dry distillation tar is 7.3%, the yield of semi-coke is 67.8%, and the specific gravity of low-temperature tar is 1.15g / ml. The semi-coke properties and the distillation range analysis of tar are shown in Table 5 and Table 6.

[0078] Table 5 Work points and element points data of the Yilan si...

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Abstract

The invention provides a fluidized bed low-temperature destructive distillation system and a low-temperature destructive distillation method of low-rank coal. According to the method, a mixed gas of hot coal gas produced by a gasification furnace and circulation cold coal gas is adopted as a hot carrier and a fluidizing gas of a destructive distillation reaction. A hydrogen atmosphere of coal gas can provide a partial hydrogenation effect, such that obtained tar has the advantages of high light component content, good quality, high thermal efficiency, and high yield. Also, with the method, a two-stage low-temperature destructive distillation reactor is adopted, such that the retention time of solid particles in the reactor is increased, destructive distillation effect is improved, high solid content in the bed can be maintained, and operation stability can be maintained. The invention also provides a low-temperature destructive distillation reactor. The low-temperature destructive distillation reactor is the two-stage low-temperature destructive distillation reactor, such that the retention time of solid particles in the reactor is increased, and destructive distillation effect is improved. With the two-stage low-temperature destructive distillation reactor, high solid content in the bed can be maintained, and operation stability can be maintained.

Description

technical field [0001] The invention relates to the technical field of energy and chemical industry, more specifically, to a fluidized bed low-temperature dry distillation system and a low-rank coal low-temperature dry distillation method. Background technique [0002] The characteristics of my country's resource structure rich in coal and low in oil determine the dominant position of coal in energy consumption. Realizing the efficient and clean utilization of coal is of great importance to solve my country's coal-burning pollution, oil shortage, and realize the overall optimization and sustainable development of resources, energy and the environment. significance. Coal is a complex substance composed of C, H, O and other elements. Its main structure is a polymerized macromolecular aromatic ring, and a certain amount of small molecular hydrocarbon compounds and heterocyclic compounds are dispersed in the main structure. During the low-temperature dry distillation process, lo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10B53/04C10B49/10C10B57/10C10B57/14C10J3/82C10J3/60C10K1/00C10K1/02C10K1/10
Inventor 王伟东赵建涛徐亦丰张静刘晓生张学权刘蕾
Owner CHINA COAL ENERGY HEILONGJIANG COAL CHEM
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