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Step-by-step pressure reducing deacidification and deamination method and system for coal chemical industry wastewater

A technology for coal chemical wastewater, deacidification and deamination, which is applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sewage treatment, etc. Problems such as section operation and side line addition and subtraction are not easy to control, so as to increase the stable operation period, reduce mutual interference, and not easy to block.

Inactive Publication Date: 2017-04-05
西安润格环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent 200810106916.X proposed a double reactor steam stripping method for treating coal chemical wastewater containing phenol and ammonia, which is characterized in that the wastewater after deacidification is dephenolized and then deammonized, and there are deacidification and deamination in the process of practical industrial application The effect is poor, which affects the operation of the subsequent dephenolization treatment section, and the energy consumption is high, and the process flow is complicated
At present, the single-reactor pressurized side stripping process commonly used in the petrochemical industry also has certain problems in the application process of the coal chemical industry. Poor technical issues

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  • Step-by-step pressure reducing deacidification and deamination method and system for coal chemical industry wastewater

Examples

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example 1

[0022] A method for deacidification and deamination of coal chemical industry waste water by step-by-step decompression double reactors and the equipment of the system include a settling tank (1), a deacidification reactor (2), a deamination reactor (3), and a waste water heater (4), waste water heat exchanger (5), primary cooler (6), primary flash tank (7), secondary cooler (8), primary flash tank (9), ammonia concentration reactor (10), separation liquid storage tank (11), return pump (12). The deacidification reactor, deamination reactor, and ammonia concentration reactor are all packing reactors, using honeycomb grid structured packing.

[0023] The process flow diagram of the present invention is as figure 1 shown. The waste water (A) containing volatile acid and ammonia nitrogen produced by the pressurized Lurgi gasifier first enters the settling tank (1) to remove insoluble impurities such as sludge and slick oil, and the CO in the waste water 2 Content 5000mg / L, H ...

example 2

[0026] The method and system for deacidification and deamination of coal chemical wastewater with double-reactor decompression step by step are as described in Example 1.

[0027] The wastewater generated during the pressurized fixed bed gasification process is subjected to gravity sedimentation to remove insoluble impurities such as sludge and slick oil, and the CO in the wastewater 2 Content 3000mg / L, H 2 The S content is 110mg / L, the free ammonia content is 5000mg / L, and the fixed ammonia content is 800mg / L. The wastewater treatment process and steps are as described in Example 1. Deacidification reactor The pressure at the top of the reactor is 0.35MPa, the temperature at the top of the reactor is 60°C, and the temperature at the bottom of the reactor is 140°C. Deamination Reactor Reactor top pressure 0.20MPa, reactor top temperature 90°C, reactor bottom temperature 120°C, other conditions as described in Example 1. After deacidification and deamination treatment by the...

example 3

[0029] The method and system for deacidification and deamination of coal chemical wastewater with double-reactor decompression step by step are as described in Example 1.

[0030] The wastewater generated during the coal coking process is subjected to gravity sedimentation to remove insoluble impurities such as sludge and slick oil, and the CO in the wastewater 2 Content 1000mg / L, H 2The S content is 50mg / L, the free ammonia content is 2000mg / L, and the fixed ammonia content is 500mg / L. The wastewater treatment process and steps are as described in Example 1. Deacidification reactor The pressure at the top of the reactor is 0.25MPa, the temperature at the top of the reactor is 60°C, and the temperature at the bottom of the reactor is 120°C. Deamination Reactor The pressure at the top of the reactor is 0.10 MPa, the temperature at the top of the reactor is 90° C., and the temperature at the bottom of the reactor is 110° C. Other conditions are as described in Example 1. Afte...

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Abstract

The invention discloses a step-by-step pressure reducing double-reactor deacidification and deamination method and system for coal chemical industry wastewater. Waste water generated due to coal gasification and coking and containing volatile acid and ammonia nitrogen firstly passes through a deacidification reactor to remove acidic gas, then pressure reducing is performed, the waste water enters a deamination reactor, and the pressure difference of the two reactors is 20-200 KPa. Certain-contraction ammonium ions in NaOH solution decomposition water are added into the upper portion of the deamination reactor, gas exhausted out of the top of the deamination reactor is subjected to double flash evaporation and passes through an ammonia concentration reactor so that concentrated ammonia gas can be collected, and deaminated waste water flowing out of the bottom of the deamination reactor is conveyed into a subsequent workshop section for treatment after exchanging heat with to-be-treated waste water. After the method is adopted for treatment, the sulfur remaining amount of the waste water is smaller than 20 mg / L, and the ammonia remaining amount is smaller than 100 mg / L. The method has the beneficial effects of being high in deacidification and deamination precision, stable in running, low in energy consumption, mature in technology and easy to operate and control, can be used for treating the waste water generated in the coal gasification, coking and chemical synthesis process and containing high-concentration volatile acid and ammonia nitrogen.

Description

technical field [0001] The invention relates to a method and system for deacidification and deamination of coal chemical wastewater with double-reactor decompression step by step, which belongs to the technical field of industrial wastewater treatment, and is especially suitable for treating wastewater produced in coal gasification and coking processes, and can also be used in petrochemical processes. Wastewater containing high concentrations of volatile acids and ammonia nitrogen. Background technique [0002] The wastewater produced by coal gasification and coking process contains a large amount of volatile acid gas (CO 2 、H 2 S, etc.), free ammonia, fixed ammonia (ammonium salts), phenolic substances, etc., are the most difficult industrial wastewater to treat, and the treatment is difficult and costly. With the increasingly stringent national environmental protection laws and regulations, the purification and treatment of wastewater has become a difficult problem that ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10
CPCC02F9/00C02F1/048C02F1/40C02F1/66C02F2001/007
Inventor 王伟东赵建涛赵仁杰
Owner 西安润格环保科技有限公司
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