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High-temperature disposal and utilization method for low-temperature dry distillation waste water of coal

A low-temperature and high-temperature technology, which is applied in the field of high-temperature disposal and utilization of coal low-temperature dry distillation wastewater, can solve the problems of low calorific value of coal gas, and achieve the effects of high energy efficiency, resource utilization and low disposal cost.

Inactive Publication Date: 2017-06-20
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a method for high-temperature treatment and utilization of coal low-temperature carbonization wastewater, so as to solve the problems (2) and (4) in the above-mentioned prior art, that is, the problem of wastewater treatment and low calorific value of coal gas

Method used

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  • High-temperature disposal and utilization method for low-temperature dry distillation waste water of coal
  • High-temperature disposal and utilization method for low-temperature dry distillation waste water of coal
  • High-temperature disposal and utilization method for low-temperature dry distillation waste water of coal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1 Application of low-temperature dry distillation semi-coke centralized industrial zone that processes 2 million tons of coal a year

[0038] (1) Basic information:

[0039] 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 excess gas volume per ton of coal is 580m 3 Left and right (Shenmu coal), gas calorific value 7106-7942kJ / Nm 3 , Gas is used for gas-coal hybrid power generation. The output of process wastewater is 120kg / ton semi-coke.

[0040] The reference gas composition is as follows:

[0041] h 2 10.2%, CO 8.6%, CO 2 6.5%, CH 4 13.39%, C2-C5 1.04%, the rest is nitrogen. Calorific value 7728kJ / m 3 .

[0042] (2...

Embodiment 2

[0047] Example 2 Application of the semi-coke production plant with an annual output of 600,000 tons

[0048] (1) Basic information

[0049] 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 7116-7810kJ / Nm 3 , Coal gas is used in the production of magnesium metal. The output of process wastewater is 160kg / ton semi-coke.

[0050] The reference gas composition is: H 2 11.2%, CO 9.9%, CO 2 6.1%, CH 4 11.49%, C2-C5 1.14%, the rest is nitrogen. Calorific value of gas 7452kJ / m 3 .

[0051] (2) Application method

[0052] The pressure swing adsorption oxygen generator is used to disperse the oxygen supply. The specific implementation method and technical measures are the same as example 1. Oxygen...

Embodiment 3

[0056] Example 3 The semi-coke production plant with an annual output of 1.2 million tons

[0057] (1) Basic information

[0058] The vertical square furnace is used as the basic production equipment, the air is used for combustion, and the coal-to-coke ratio is 1.68:1. 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 580m 3 Left and right (Shenmu coal), gas calorific value 7102-7860kJ / Nm 3 . The output of process wastewater is 135kg / ton semi-coke. The coal gas is consumed by small-scale gas-fired power generation, and the efficiency of the generator is 38%.

[0059] Gas reference composition: H 2 10.64%, CO 11.0%, CO 2 5.9%, CH 4 11.42%, C2-C5 1.13%, calorific value 7688kJ / m 3 .

[0060] (2) Application method

[0061] Air separation oxygen production and decentralized oxygen supply are adopted. Schematic diagrams and text descriptions of other reference embodiments. Water-cooled o...

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Abstract

The invention discloses a high-temperature disposal and utilization method for low-temperature dry distillation waste water of coal. The method comprises the following steps of: mixing and spraying wastewater, combustion coal gas and oxygen / oxygen-enriched air generated by low-temperature dry distillation of coal in an internal heating type low-temperature drying distillation furnace into a combustion chamber to combust, wherein organic matters, CODs and phenolic substances in the wastewater are combusted or decomposed by means of high temperature generated by combustion to obtain high-temperature coal gas containing hydrogen, carbon monoxide and water vapor; feeding the high-temperature coal gas into the internal heating type low-temperature drying distillation furnace or additionally adding circular cooled coal gas to be adjusted to mixed gas which is then fed into the internal heating type low-temperature drying distillation furnace; and exchange heat with the coal in the internal heating type low-temperature drying distillation furnace to realize dry distillation. As the wastewater in the dry distillation process is mainly originated from water in the coal, the wastewater generated by dry distillation can be fully consumed. According to the method disclosed by the invention, an oxygen and coal gas combustion chamber with a wastewater nozzle is arranged out of an existing dry distillation furnace without changing the basic structure of the existing dry distillation furnace, so that the method is convenient to implement and higher in energy efficiency.

Description

technical field [0001] The invention relates to the fields of coal chemical industry, new energy and environmental protection, in particular to a method for high-temperature disposal and utilization of coal low-temperature carbonization wastewater. Background technique [0002] my country has huge reserves of lignite, how to effectively use this resource is a problem that needs to be paid close attention to. Low-temperature dry distillation can effectively recycle the tar and produce semi-coke and gas. The gas can be used as raw material for chemical product extraction and processing, and semi-coke can be used as a reducing agent for metallurgy, clean fuel or coke for gasification. Low-temperature dry distillation is beneficial to the comprehensive utilization of resources and increases the added value of low-metamorphic coal. It is a potential technology development direction, also known as coal other than gasification, liquefaction, and coking. Article 4 Clean transformati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/02C10B53/00C10B21/08C10B21/10C02F101/34
CPCC10B21/08C10B21/10C10B53/00C02F1/02C02F2101/345
Inventor 赵俊学马成邹冲胡冰刘启航唐雯聃康毅
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY