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Coal gas internal heating low-temperature cracking process

A technology for dry distillation of coal and gas, applied in the petroleum industry, coke ovens and other directions, can solve problems such as unfavorable comprehensive utilization, large waste of resources, and reduction of gas calorific value, etc., to improve the level of technology and equipment, realize comprehensive utilization of co-production, improve The effect of tar production

Inactive Publication Date: 2008-08-27
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] For the metallurgical coke production enterprises in Shanxi, Shanxi, Ningmeng and Meng areas of our country, there are five main problems. First, the internal heating adopts the way of furnace air and gas combustion heating, and the combustion waste gas is mixed into the gas. It reduces the calorific value of the gas, which not only increases the processing capacity of the purification system, but also is not conducive to comprehensive utilization; second, the yield of tar is low, and the tar in the gas is washed by circulating water spray condensation method, and separated by natural precipitation. The separation is not complete; the third is that there is no reasonable way to utilize the gas, and the gas is mainly discharged through direct combustion; the fourth is that the equipment and operating system have not been optimized; the fifth is that environmental pollution and ecological problems are prominent, and resources are wasted

Method used

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  • Coal gas internal heating low-temperature cracking process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1 Application of low-temperature dry distillation semi-coke centralized industrial zone that processes 2 million tons of coal a year

[0032] (1) Basic information:

[0033] There are three semi-coke production plants with an annual processing capacity of 600,000 tons, and one semi-coke production plant with an annual processing capacity of 200,000 tons. The basic production equipment is a vertical square furnace, air-assisted combustion, and the coal-to-coke ratio is 1.65:1. The tar yield is about 8% (Shenmu dry-based raw coal is the benchmark), and the remaining gas volume per ton of coal is 580m 3 Left and right (Shenmu coal), gas calorific value 1700-1900kcal / Nm 3 , The gas is consumed by gas-coal hybrid power generation, and the generator efficiency is about 39%. The reference gas composition is as follows:

[0034] h 2 10.2%, CO 8.6%, CO 2 6.5%, CH 4 13.39%, C2-C5 1.04%, and the rest is nitrogen. Calorific value 1849kcal / m 3 .

[0035] (2) Appl...

Embodiment 2

[0040] Example 2 Application of the semi-coke production plant with an annual output of 600,000 tons

[0041] (1) Basic information

[0042] The vertical square furnace is used as the basic production equipment, the air is used for 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), gas calorific value 1700-1900kcal / Nm 3 , The coal gas is consumed by small-scale gas-fired power generation, and the generator efficiency is 38%. Power generation is mainly for self-use, and part of the gas is burned and discharged.

[0043] The reference gas composition is: H 2 11.2%, CO 9.9%, CO 2 6.1%, CH 4 11.49%, C2-C5 1.14%, and the rest is nitrogen. Calorific value of gas 1768kcal / m 3 .

[0044] (2) Application method

[0045] The pressure swing adsorption oxygen generator is used to disperse the oxygen supply. The ...

Embodiment 3

[0050] Example 3 Application of a semi-coke production plant with an annual output of 600,000 tons

[0051] (1) Basic information

[0052] The vertical square furnace is used as the basic production equipment, the air is used for 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), gas calorific value 1700-1900kcal / Nm 3 , The coal gas is consumed by small-scale gas-fired power generation, and the generator efficiency is 38%. Power generation is mainly for self-use, and part of the gas is burned and discharged.

[0053] The reference gas composition is: H 2 11.2%, CO 9.9%, CO 2 6.1%, CH 4 11.49%, C2-C5 1.14%, and the rest is nitrogen. Calorific value of gas 1768kcal / m 3 .

[0054] (2) Application method

[0055] The pressure swing adsorption oxygen generator is used to disperse the oxygen supply. The sp...

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Abstract

The invention discloses a coal-gas internal-heat retorting method, which comprises leading oxygen-enriched or pure oxygen to produce high-temperature discharge gas with burning gas in a burner outside of a furnace to be basal heat resource which is needed by coal carbonization, mixing high-temperature discharge gas which is produced with cold coal gas which is produced in the restoring process after removing coke tar, preparing high-temperature circulation gas whose temperature is 680-810 DEG C, drumming high-temperature circulation gas into an internal heating type coal gas retort, heating coal in the furnace in non oxidation or weak oxidation, and achieving none combustion cycle of cycle part gas. The method which is utilized can effectively lower nitrogen content in coal gas, improve heat value of coal gas, improve coke tar yield, and improve semi-coke quality.

Description

technical field [0001] The invention relates to a coal dry distillation method, in particular to a coal gas internal heat low temperature dry distillation method. The invention is suitable for the production process of iron alloy coke. Background technique [0002] Parts of northern my country are rich in coal resources and of good quality, which are low-ash, low-sulfur, low-phosphorus, and high-volatile weakly sticky and non-sticky coals. The low-temperature dry distillation of non-coking coal to produce ferroalloy coke (also known as semi-coke or semi-coke) is currently the main coal conversion industry in the local area. The pollution is serious, which does not meet the requirements of the national environmental protection policy and sustainable development, and directly affects the modernization and development of the energy and chemical industry base. Proceeding from the overall situation of sustainable economic and social development, actively carry out the comprehen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B57/14
Inventor 赵俊学李小明兰新哲袁媛
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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