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A carbonaceous raw material fluidized bed pyrolysis product graded recovery system and recovery method thereof

A pyrolysis product, fluidized bed technology, which is applied in the direction of direct heating and dry distillation, the preparation of liquid hydrocarbon mixtures, and the petroleum industry, which can solve the problems of difficult processing, water consumption, waste, etc.

Active Publication Date: 2020-10-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are still some low-carbon hydrocarbons in the purified gas after recovering the product, and most processes burn this part of the purified gas as fuel directly, which causes a great waste of low-carbon hydrocarbons with high added value
In addition, when the traditional water washing process is used to treat pyrolysis oil and gas, not only a large amount of water resources are consumed, but also a large amount of tar and dust are captured at one time, which leads to the problems of poor quality of tar and difficult processing

Method used

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  • A carbonaceous raw material fluidized bed pyrolysis product graded recovery system and recovery method thereof
  • A carbonaceous raw material fluidized bed pyrolysis product graded recovery system and recovery method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The schematic diagram of the process flow of the carbonaceous raw material fluidized bed pyrolysis product classification recovery method in this embodiment is as follows figure 2 shown. The raw material, solid heat carrier and fluidization gas enter the fluidized bed pyrolysis reactor 1 through raw material inlet a, solid heat carrier inlet b and fluidization gas inlet c respectively. The pyrolysis reaction is carried out in the fluidized bed pyrolysis reactor 1, and the pyrolysis reaction is operated under normal pressure. The pyrolysis semi-coke is discharged from the pyrolysis semi-coke outlet d located in the upper middle part of the fluidized bed pyrolysis reactor 1, and the pyrolysis oil gas is discharged from the top of the fluidized bed pyrolysis reactor 1 and enters through the gas inlet at the bottom of the oil washing tower 2 The oil scrubber 2, the oil scrubber 2 washes pyrolysis oil gas countercurrently with cold tar, recovers heavy tar and removes dust ...

Embodiment 2

[0059] Example 2 was completed in the process flow described in Example 1. The coal sample A used was dried and pulverized into a 40-80 mesh pulverized coal sample. The industrial analysis and elemental analysis of the sample are shown in Table 1.

[0060] Table 1 Industrial analysis and elemental analysis of coal samples

[0061] Coal sample A Coal sample B Industrial Analysis M ad

0.65 5.83 A d

11.03 11.47 V daf

33.45 38.40 FC daf

66.55 61.60 Elemental analysis / daf C 79.86 71.47 H 4.47 4.29 N 1.07 1.10 S 1.33 1.39 O 13.27 21.75

[0062] The pyrolysis temperature of the fluidized bed pyrolysis reactor is 600°C, and the selected fluidization velocity is 0.8m / s. The feeding amount of pulverized coal raw material A is 100t / h.

[0063] The oil washing tower recovers 4.7t / h of dusty heavy tar.

[0064] The first-stage heat exchanger recovers 3.6t / h of dust-free medium tar; the...

Embodiment 3

[0068] The coal sample B used in Example 3 was dried and pulverized into a 40-80 mesh pulverized coal sample. The industrial analysis and elemental analysis of the sample are shown in Table 1.

[0069] The pyrolysis temperature of the fluidized bed pyrolysis reactor is 550° C., and the fluidization velocity is 0.8 m / s. The feeding amount of pulverized coal raw material B is 100t / h.

[0070] The oil washing tower recovers 6.2t / h of dusty heavy tar.

[0071] The first-stage heat exchanger recovers 5.3t / h of dust-free medium tar; the second-stage heat exchanger recovers 1.1t / h of dust-free light tar, and at the same time discharges 6.2t / h of organic wastewater.

[0072] Desulfurization and decarbonization unit recovers CO 2 and H 2 S is 2916Nm respectively 3 / h and 93Nm 3 / h.

[0073] The recovery of low-carbon hydrocarbons by the low-carbon hydrocarbon removal unit is 1.61t / h, and the pyrolysis dry gas is 7700Nm 3 / h.

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Abstract

The invention discloses a carbonaceous raw material fluidized bed pyrolysis product graded recovery system and a recovery method thereof. The recovery system comprises a fluidized bed pyrolysis reaction unit, an oil washing unit, a condensation recovery unit, a deep deoiling unit, a desulfurization and decarbonization unit and a low-carbon hydrocarbon removal unit. According to the system and themethod provided by the invention, high-temperature pyrolysis oil gas is sequentially subjected to the processes of oil washing, heat exchange condensation, deep deoiling, desulfurization and decarburization, low-carbon hydrocarbon removal and the like to respectively obtain heavy tar, medium tar, light tar, low-carbon hydrocarbon and pyrolysis dry gas products, so that the step-by-step recovery and purification of pyrolysis products are realized. And compared with the prior art, the use amount of water and the discharge amount of organic wastewater are greatly reduced, and the wastewater treatment cost is reduced.

Description

technical field [0001] The invention relates to the field of pyrolysis of solid carbonaceous materials, in particular to a classification recovery system and recovery method for fluidized bed pyrolysis products of carbonaceous materials. Background technique [0002] In recent years, my country's dependence on foreign oil has gradually approached 70%, which seriously restricts the rapid growth of my country's national economy. Therefore, converting solid fuel resources such as coal, which is relatively abundant in my country, into oil and gas resources is one of the important ways to solve the high dependence on foreign oil. [0003] The methods for converting solid materials such as coal into oil and gas resources are mainly coal pyrolysis and coal gasification. However, the traditional coal pyrolysis process generally has problems such as high energy consumption, poor environmental protection performance, and single product structure in terms of product purification. Thi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10B49/10C10B49/22C10B57/00C10G1/00
CPCC10B49/10C10B49/22C10B57/00C10G1/00C10G1/002
Inventor 邹亮吴治国王鹏飞王卫平
Owner CHINA PETROLEUM & CHEM CORP
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