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Internal heating type low-temperature oxygen-enriched destructive coal distillation process and system for quality-divided returned coal gas

A process method and coal dry distillation technology, which is applied in special forms of dry distillation, coke ovens, petroleum industry, etc., can solve the problems of high local flame temperature, shortening the flame length of the low temperature dry distillation furnace, and unreasonable temperature and airflow distribution in the furnace. , to achieve the effect of improving gas quality, avoiding slagging in the furnace and unstable product quality, and improving the calorific value and utilization value of gas

Active Publication Date: 2020-05-22
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, directly replacing air with enriched oxygen will shorten the length of the flame in the flue of the low-temperature retort furnace, and cause the local temperature of the flame to be too high, which will easily lead to unreasonable distribution of temperature and air flow in the furnace, and then cause slagging and cross-section of the retort furnace during operation. Problems such as uneven temperature distribution and unstable quality of dry distillation products

Method used

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  • Internal heating type low-temperature oxygen-enriched destructive coal distillation process and system for quality-divided returned coal gas
  • Internal heating type low-temperature oxygen-enriched destructive coal distillation process and system for quality-divided returned coal gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Example 1 Reconstruction of gas separation and oxygen-enriched dry distillation in semi-coke production plant with an annual output of 900,000 tons

[0059] (1) Basic information

[0060] There are 2 sets of vertical square furnaces as the basic production equipment (the annual output of a single furnace is 75,000 tons of semi-coke, 6 sets), air-assisted combustion, and the coal-to-coke ratio is 1.67:1. The tar yield is about 7.8% (Shenmu dry-based raw coal is used as the benchmark), and the remaining gas volume per ton of coal is 560m 3 Left and right (Shenmu coal), coal gas is used for small gas-fired power generation. Gas composition before transformation: H 2 18.27%, CO 8.55%, CH 4 5.69%, C2-C52.35%, CO 2 6.18%, N 2 58.96%. Gas low calorific value 7365.16kJ / m 3 . The adjacent factory is a CNG production enterprise, which uses coal gasification to produce raw material gas and further prepares synthesis gas. The CNG company has oxygen production equipment...

Embodiment 2

[0066] Example 2 Transformation of synthetic medium carbonization in a low-temperature carbonization enterprise with an annual output of 1.2 million tons of semi-coke

[0067] (1) Basic information:

[0068] There are 4 groups of semi-coke production plants with an annual processing capacity of 300,000 tons (each group is composed of 6 conjoined single furnaces with an annual output of 50,000 tons), and conventional vertical square furnaces are used as basic production equipment. The coal gas is supplied to the downstream synthetic ammonia enterprises as raw material gas. The gas composition is: H 2 19.07%, CO 8.62%, CO 2 6.25%, CH 4 5.52%, C2-C5 3.01%, N 2 57.53%. Gas low calorific value 7541.81kJ / m 3 . The downstream synthetic ammonia enterprises are equipped with PSA pressure swing adsorption gas separation device, which can be used for gas separation in this process.

[0069] (2) Application method

[0070] According to the method of the present invention, duri...

Embodiment 3

[0073] Example 3 Transformation of synthetic medium carbonization in a low-temperature carbonization enterprise with an annual output of 1.8 million tons of semi-coke

[0074] (1) Basic information:

[0075] There are 4 groups of semi-coke production plants with an annual processing capacity of 450,000 tons (each group is composed of 6 connected single furnaces with an annual output of 75,000 tons), using oxygen-enriched dry distillation with an oxygen-enriched ratio of 50%. Oxygen is provided by synthetic ammonia enterprises, which has surplus oxygen production capacity. The coal gas is supplied to the downstream synthetic ammonia enterprises as raw material gas. The gas composition is: H 2 28.01%, CO 10.68%, CO 2 11.45%, CH4 13.32%, C2-C5 3.01%, N 2 37.53%. The downstream synthetic ammonia enterprises are equipped with PSA pressure swing adsorption gas separation device, which can be used for gas separation in this process.

[0076] When the oxygen enrichment ratio ...

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Abstract

The invention discloses an internal heating type low-temperature oxygen-enriched destructive coal distillation process and system for quality-divided returned coal gas. The process comprises the following steps: introducing dehydrogenated coal gas, air and oxygen into an internal heating type low-temperature destructive coal distillation furnace; mixing the air and the oxygen to form oxygen-enriched combustion-supporting gas; and subjecting the dehydrogenized coal gas and the oxygen-enriched combustion-supporting gas to oxygen-enriched combustion in the internal heating type low-temperature destructive coal distillation furnace, wherein the volume fraction of oxygen in the oxygen-enriched combustion-supporting gas is greater than or equal to 30%. A step of acquiring the dehydrogenated coalgas comprises the following sub-steps: carrying out coal gas cooling and tar trapping on coal gas generated by the internal heating type low-temperature destructive coal distillation furnace to obtain purified coal gas; separating and removing hydrogen in the purified gas so as to obtain the dehydrogenated gas. According to the invention, the flame length and the flame temperature of a flame pathcan better meet the requirements of a low-temperature destructive distillation process, the influence of too high combustion speed of oxygen-enriched destructive distillation high-hydrogen-content coal gas is reduced, the long-period operation of an oxygen-enriched destructive distillation process device and the stable quality of dry distillation products are realized, and the high-added-value gradient utilization of the coal gas can be realized.

Description

technical field [0001] The invention belongs to the technical field of low-temperature dry distillation of coal chemical industry, and in particular relates to a low-temperature oxygen-enriched coal dry distillation process method and system of gas separation and return to furnace internal heating. Background technique [0002] my country is rich in low-metamorphic coal resources, and low-temperature dry distillation to obtain gas, semi-coke and tar is an effective method for the utilization of low-metamorphic coal. In recent years, low-temperature coal dry distillation technology has developed rapidly in my country, especially in Shanxi, Shaanxi, Ningmeng, and Xinjiang, and the production capacity has reached more than 130 million tons. At present, the vertical internal heating furnace is mainly used. The main process includes: adding lump coal from the top of the furnace, mixing gas and air and igniting it, blowing it in from the lower part of the furnace, and walking oppo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B53/00C10B57/14
CPCC10B53/00C10B57/14
Inventor 赵俊学任萌萌邹冲杨浩马成何江永张小蕊
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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