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Method for recycling coal chemical industry high-salt wastewater by blind coal oxygen-rich combustion process

A high-salt wastewater and oxygen-enriched combustion technology, which is applied in chemical instruments and methods, chemical industry, water/sewage treatment, etc., can solve the problem of inability to achieve harmless disposal of high-salt wastewater, inability to efficiently separate salt substances, and high solubility and other problems, to achieve the effect of strong process applicability, wide applicability and simple operation

Inactive Publication Date: 2016-04-20
泫龙(北京)环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the end result is not what the process technology expects - industrial salt and reused fresh water
This is because most of the salts in wastewater are chlorine salts, which have a particularly high solubility in water. The crystallization method of concentration and cooling cannot efficiently separate the salts at all, and it is impossible to realize the harmless disposal of high-salt wastewater.

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  • Method for recycling coal chemical industry high-salt wastewater by blind coal oxygen-rich combustion process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0023] Put 500Kg of anthracite into the combustion furnace, inject oxygen through the spray gun for oxygen-enriched combustion, the pressure of oxygen injection is 1.2MPa, and the temperature in the furnace reaches 1500°C. 22%) 100Kg is added to the combustion furnace by spraying, the spraying pressure is 0.1MPa, the remaining water in the high-salt wastewater is removed by gasification, and organic matter such as COD in the high-salt wastewater is removed by oxygen-enriched combustion , the salts are transformed into sodium silicate and calcium oxide. After burning for 60 minutes, the molten silicate is poured into the tundish for transfer. After cooling, it is used as a desiliconization agent, dephosphorization agent, and desulfurization agent. The high-temperature flue gas produced is used for waste heat recovery. Finally, carry out dust collection and washing treatment, and discharge it into the atmosphere after meeting the emptying requirements. The obtained washing liquid...

Embodiment example 2

[0025] Put 400Kg of anthracite into the combustion furnace, inject air through the spray gun to carry out oxygen-enriched combustion, the oxygen injection pressure is 1.5MPa, and the temperature in the furnace reaches 1400°C. 25%) 100Kg is added to the combustion furnace by spraying, the spraying pressure is 1.0MPa, the remaining water in the high-salt wastewater is removed by gasification, and the COD organic matter in the high-salt wastewater is removed by oxygen-enriched combustion. Salts are transformed into sodium silicate and calcium oxide. After 80 minutes of combustion, the molten silicate is poured into the tundish for transfer. After cooling, it is used as desiliconization agent, dephosphorization agent, and desulfurization agent. The high-temperature flue gas produced is recovered after waste heat , carry out dust collection and washing treatment, and discharge it into the atmosphere after meeting the emptying requirements. The obtained washing liquid is sent to the ...

Embodiment example 3

[0027] Put 800Kg of anthracite into the combustion furnace, inject oxygen through the spray gun for oxygen-enriched combustion, the pressure of oxygen injection is 1.5MPa, and the temperature in the furnace reaches 700°C. 5%) 200Kg is fed into the combustion furnace through the feeder, the spray pressure is 1.8MPa, the remaining water in the high-salt wastewater is removed by gasification, and the COD organic matter in the high-salt wastewater is removed by oxygen-enriched combustion. Salts are transformed into sodium silicate and calcium oxide. After 90 minutes of burning time, the molten silicate is poured into the tundish for transfer. After cooling, it is used as desiliconization agent, dephosphorization agent, and desulfurization agent. The high-temperature flue gas produced is recovered after waste heat , carry out dust collection and washing treatment, and discharge it into the atmosphere after meeting the emptying requirements. The obtained washing liquid is sent to the...

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Abstract

The invention discloses a method for recycling coal chemical industry high-salt wastewater by a blind coal oxygen-rich combustion process, which is characterized by comprising the following steps: putting blind coal in a combustion furnace, blowing in oxidizing gas to carry out oxygen-rich combustion, and adding a certain proportion of organic high-salt wastewater into the oxygen-rich combustion furnace, wherein water mist in the high-salt wastewater is completely vaporized under the action of high temperature, organic matters are oxidized and decomposed into carbon dioxide, water and a small amount of inorganic matter ash in the furnace, partial NOx, SOx and HCl are generated in the flue gas, and salts are converted into sodium silicate and calcium oxide; cooling to obtain a desilication agent, a dephosphorizing agent and a desulfurizer in molten iron pretreatment; and after carrying out waste heat recovery on the high-temperature flue gas, carrying out dust collection and washing treatment, discharging the flue gas into air after satisfying the exhaust requirements, and sending the obtained washing solution to an acid plant. The method converts coal chemical industry organic high-salt wastewater into harmless resources; the product has higher added value; and the technique has favorable industrialization prospects.

Description

technical field [0001] A method for the resourceful treatment of coal chemical high-salt wastewater by anthracite oxygen-enriched combustion, which belongs to the field of harmless environmental protection of hazardous waste Background technique [0002] Generally, high-salt wastewater refers to wastewater containing organic matter and total dissolved solids (TDS) mass fraction greater than 3.5%. Because in this type of wastewater, in addition to organic pollutants, it also contains a large amount of soluble inorganic salts, such as Cl - 、Na + , SO 4 2- , Ca 2+ , This type of wastewater is generally the limit of biochemical treatment. At present, the treatment methods of high-salt wastewater mainly include biochemical treatment, evaporation and concentration, and multiple-effect distillation. With the progress and development of biochemical technology, the successful isolation, cultivation and domestication of salt-tolerant halophilic bacteria have made it possible to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/16
CPCC02F1/048C02F1/16Y02P20/10
Inventor 朱海涛
Owner 泫龙(北京)环保科技有限公司