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Method for treating ammonia-containing waste water from crushed coal pressure gasification

A technology of pressurized gasification and treatment of crushed coal, which is applied in degassed water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc. It can solve the problem of poor deamination effect and long process flow, etc. Problems, to achieve the effect of simple process, reduce environmental pollution, and large operating flexibility

Active Publication Date: 2012-07-11
SEDIN ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of this treatment method is long, and the deamination effect is not good.

Method used

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  • Method for treating ammonia-containing waste water from crushed coal pressure gasification
  • Method for treating ammonia-containing waste water from crushed coal pressure gasification

Examples

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Effect test

Embodiment 1

[0021] The crushed coal pressurized gasification wastewater after removing suspended solids, tar and some light oils enters the device of the present invention. The wastewater volume is 50 tons per hour, the temperature is 20-60°C, and it contains: free ammonia 7040mg / L, total ammonia 7740mg / L, phenol 50mg / L, carbon dioxide 420mg / L, oil 1mg / L.

[0022] After the ammonia-containing wastewater is pressurized to 3.8 MPa by the pressurizing pump 2, it exchanges heat with the purified water from the bottom of the stripper 4 in the inlet and outlet water heat exchanger 3, and is heated to 210°C from the upper part of the stripper 4. Enter the stripping tower, and at the same time, use an alkali pump to add a sodium hydroxide solution with a weight concentration of 5%, a temperature of 60°C, and a flow rate of 2.8t / h (5.6% of the weight of ammonia-containing wastewater) at the top of the stripper 4. And mixed with ammonia-containing wastewater, running from top to bottom. The medium-p...

Embodiment 2

[0025] The crushed coal pressurized gasification wastewater after removing suspended solids, tar and some light oil, enters the device of the present invention. The wastewater volume is 100 tons per hour, the temperature is 20-60°C, and it contains: free ammonia 9800mg / L , Total ammonia 11200mg / L, phenol 30mg / L, carbon dioxide 470mg / L, oil 1mg / L.

[0026] After the ammonia-containing wastewater is pressurized to 3.8 MPa by the pressurizing pump 2, it exchanges heat with the purified water from the bottom of the stripper 4 in the inlet and outlet water heat exchanger 3, and is heated to 210°C from the upper part of the stripper 4. Enter the stripping tower, and at the same time, use an alkali pump to add a sodium hydroxide solution with a weight concentration of 10%, a temperature of 30°C, and a flow rate of 6.2t / h (6.2% by weight of ammonia-containing wastewater) at the top of the stripper 4. And mixed with ammonia-containing wastewater, running from top to bottom, 3.8MPa, 440℃, ...

Embodiment 3

[0029] The crushed coal pressurized gasification wastewater after removing suspended solids, tar and some light oil, enters the device of the present invention. The wastewater volume is 80 tons per hour, the temperature is 20-60°C, and it contains: 7900mg / L of free ammonia , Total ammonia 8300mg / L, phenol 40mg / L, carbon dioxide 410mg / L, oil 1mg / L.

[0030] After the ammonia-containing wastewater is pressurized to 3.6MPa by the pressurizing pump 2, it exchanges heat with the purified water from the bottom of the stripper 4 in the inlet and outlet water heat exchanger 3, and is heated to 210°C from the upper part of the stripper 4. Enter the stripper, and at the same time, use an alkali pump to add potassium hydroxide solution (6.3% by weight of ammonia-containing wastewater) with a weight concentration of 7%, a temperature of 45°C, and a flow rate of 5.0t / h at the top of the stripper 4, And mixed with ammonia-containing wastewater, running from top to bottom, 3.2MPa, 380℃, flow ra...

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Abstract

The invention discloses a method for treating ammonia-containing waste water from crushed coal pressure gasification, which comprises: performing heat exchange between the ammonia-containing waste water from the crushed coal pressure gasification and treated purified water to heat the ammonia-containing waste water to 180 to 250 DEG C; and allowing the heated ammonia-containing waste water to enter a stripper from the upper part of the stripper and flow from top down and allowing medium-pressure steam, which is under the pressure of 2.8 to 4.0Mpa and at the temperature of 320 to 450 DEG C to enter the stripper from the lower part of the stripper and flow from bottom up so as to enable the heated ammonia-containing waste water to contact the medium-pressure steam in a manner of reverse flow to strip ammonia, wherein the purified water flows out from the bottom part of the stripper and is cooled to be used as circulating water, the steam, which contains the stripped ammonia and flows out from the top part of the stripper, is delivered to a gasification furnace to be used as a gasification agent. The invention has the advantages of simple process, good ammonia stripping effect, stable operation and low energy consumption.

Description

Technical field [0001] The invention belongs to a method for purifying ammonia-containing wastewater, and specifically relates to a method for treating ammonia-containing wastewater in the pressurized gasification of crushed coal. Background technique [0002] Coal gasification is extremely common in my country's chemical industry. It is an effective way to efficiently use coal and is widely used in industries such as coal-to-gas, synthetic ammonia, synthetic methanol, and coal power generation. In coal gasification methods, crushed coal pressurized gasification processes are also used in many applications. In this process, a large amount of polluted wastewater will be produced, which contains a large amount of suspended solids, tar, CO 2 , Fatty acids, phenols, ammonia, etc., must be treated before they can be discharged. [0003] The wastewater is generally treated by a combination of chemical separation process and biochemical treatment, that is, the separation of suspended sol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/20C02F101/16
Inventor 闫保贵郑淑怡张琦宇
Owner SEDIN ENG
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