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Multi-effect energy-saving ammonia recovery process and device

An ammonia recovery and process technology, applied in the field of chemical engineering, can solve the problem of high comprehensive cost of ammonia recovery

Active Publication Date: 2010-12-15
JINAN METALLURGICAL CHEM EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings and defects of the high comprehensive cost of existing ammonia recovery. The present invention provides a multi-effect energy-saving ammonia recovery process. Another purpose of the present invention is to provide the equipment used in the process.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0016] Example 1, the coke oven riser gas with a temperature of 750C uses heat-conducting oil to obtain heat in the waste heat exchanger, and the heat-conducting oil is heated to 200C and then sent to the first-effect heater as a heating source. The waste water containing ammonia of 0.4% (wt%) is sent to the first-effect separator, the pressure of the first-effect separator is 120kPa, and the temperature is 104C; The ammonia content in the liquid phase passing through the first-effect separator is 0.08% (wt%) and sent to the second-effect separator, and the second-effect heater adopts the steam from the first-effect heater as a heating heat source. The pressure of the second-effect separator is 75kPa and the temperature is 78C; the pressure of the second-effect heater is 85kPa and the temperature is 84C. The ammonia content in the liquid phase passing through the second-effect separator is 0.009% (wt%), which is sent to biochemical treatment. The ammonia gas at the top of the...

Embodiment 2

[0018] Example 2, the temperature is 560 ° C tube furnace flue gas with reclaimed water from biochemical treatment in the waste heat heat exchanger, after the reclaimed water is heated to 110 ° C (pressure 300kPa) sent to the first effect heater as Heating heat source. Wastewater containing ammonia of 0.36% (wt%) is sent to the first-effect separator, the pressure of the first-effect separator is 85kPa, and the temperature is 88°C; the first-effect heater is heated by reclaimed water, the pressure is 80kPa, and the temperature is 84°C. The ammonia content in the liquid phase passing through the first-effect separator is 0.06% (wt%) and sent to the second-effect separator, and the second-effect heater adopts the steam from the first-effect heater as a heating heat source. The pressure of the second-effect separator is 65kPa, and the temperature is 72°C; the pressure of the second-effect heater is 75kPa, and the temperature is 74°C. The ammonia content in the liquid phase passi...

Embodiment 3

[0020] Embodiment 3, the equipment used in the multi-effect energy-saving ammonia recovery process, including a waste heat recovery device heated by waste heat gas, 2 sets of ammonia recovery units connected in series and composed of heaters and ammonia separation tower ammonia, the waste heat recovery device 1 The primary heat medium channel is connected with the waste heat gas inlet 7 and the waste heat gas outlet 8, the secondary heat medium channel is connected with the primary heat medium channel of the first-effect heater 3 through the circulation pump 2, and the first-effect ammonia separation tower is equipped with an ammonia-containing Wastewater inlet 9, the secondary heat medium channel of one-effect heater is connected with the ammoniacal waste water channel of one-effect ammonia separation tower 4, namely the ammoniacal waste water outlet 42 at the bottom of one-effect ammonia separation tower is connected with the secondary heat of one-effect heater. The inlet of ...

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Abstract

The invention discloses multi-effect energy-saving ammonia recovery process and device, in particular to energy-saving process and device for recovering ammonia from ammonia-containing wastewater, belonging to the technical filed of chemical engineering. The device comprises 2-3 groups of heaters and ammonia separating towers which operate under different pressures. The process comprises the following steps of: firstly, adding the ammonia-containing wastewater into the first-effect ammonia separating tower under higher pressure, and heating the first-effect ammonia separating tower by using a first-effect heater which recovers the waste heat of industrial waste gas; continuously adding the liquid phase of the first-effect ammonia separating tower which recovers a part of ammonia gas into the second-effect ammonia separating tower under reduced pressure, and heating the second-effect ammonia separating tower in the second-effect heater by using the ammonia gas at the top of the first-effect ammonia separating tower; and repeating the steps 2-3 times until the ammonia content in the ammonia-containing wastewater is not more than 100 mg / L. The process has obvious energy saving effect; compared with the traditional normal pressure process, the new process saves energy by 50-80%; and compared with the process purely using negative pressure, the new process saves energy by 30-40%.

Description

technical field [0001] The invention relates to an energy-saving process for recovering ammonia from waste water containing ammonia, including waste water produced in coal coking, coal gasification and chemical fertilizer processes, and belongs to the technical field of chemical engineering. Background technique [0002] Ammonia-containing wastewater is one of the common liquid discharges in chemical process. If the ammonia in it is not recovered and causes environmental pollution, it cannot be discharged directly. In the industry, a part of the ammonia is recovered to make the ammonia content in the wastewater ≤ 100mg / L, and then the biochemical treatment is carried out before the discharge. [0003] At present, ammonia in ammonia-containing wastewater is usually recovered by rectification or air stripping in industry. There are two types of distillation: direct distillation and indirect distillation. Since the direct rectification method is to directly pass steam into th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/04C01C1/10C02F101/16
CPCY02P20/129
Inventor 温燕明罗时政汤志刚姜爱国王登富康春清江玉璋陈善龙
Owner JINAN METALLURGICAL CHEM EQUIP CO LTD