CN1772339A - Method and apparatus for treating melamine producing tail gas - Google Patents
Method and apparatus for treating melamine producing tail gas Download PDFInfo
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- CN1772339A CN1772339A CN 200510104439 CN200510104439A CN1772339A CN 1772339 A CN1772339 A CN 1772339A CN 200510104439 CN200510104439 CN 200510104439 CN 200510104439 A CN200510104439 A CN 200510104439A CN 1772339 A CN1772339 A CN 1772339A
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- tail gas
- melamine
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- pressure compressor
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Abstract
The present invention is method and apparatus for treating melamine producing tail gas. Middle pressure compressor is used to compress the tail gas to pressure slightly higher than that in the middle pressure system in the urea producing apparatus, and the compressed tail gas is then guided to the middle pressure cooling and hydrolyzing unit for cooling and hydrolysis. The present invention has greatly simplified production process, omits the tail gas absorption step and middle pressure desorption step, less apparatus, easy control, low power consumption and raised operation rate.
Description
Technical field:
The present invention relates to the field of chemical engineering particularly tail gas treatment process and the equipment of melamine.
Background technology
The present tail gas treatment process of melamine draws one the tunnel from triamine district discharge and with compressor tail gas is pressurizeed, and as shown in Figure 1, the tail gas after pressurization enters the CO in the concentrated ammonia liquor absorption tail gas on 1 usefulness, second absorption tower 2, low pressure first absorption tower
2, form dense carbonated aqueous ammonia, be NH from first absorption tower, 1 tail gas discharged major part
3The dense carbonated aqueous ammonia that comes out in first absorption tower 1 toward middle pressure desorber 3, enters second absorption tower 2 from first absorption tower, 1 tail gas discharged with pumping, absorbs with weak aqua ammonia or desorb waste water, and the tail gas after the absorption does not have NH substantially
3, CO
2Some inert gas only, emptying gets final product, and the concentrated ammonia liquor after the absorption enters first absorption tower 1 and absorbs and use.The middle desorber 3 of pressing is with the dense carbonated aqueous ammonia of 1.8-2.OMa steam (saturated) desorb, separates whole CO that are of sucking-off
2The NH of the overwhelming majority
3And to deserved H
2O.Waste water after the desorb contains ammonia seldom, and stripping gas is absorbed by the one section absorption system in liquid urine district, forms first ammonium liquid.The major defect of said method is that technological process is long, power consumption is high, equipment needed thereby is more and practical operation is very inconvenient, influences production efficiency.
Summary of the invention
One of purpose of the present invention is the defective at prior art, and a kind of method of handling melamine producing tail gas is provided, and this method is shortened process effectively, cut down the consumption of energy, and easy to operate.
Two of purpose of the present invention is to be to provide a kind of equipment that uses said method to handle melamine producing tail gas.
A kind of method of handling melamine producing tail gas of the present invention, it comprises the steps:
A, the tail gas (mainly containing ammonia and carbon dioxide) that produces in the Melamine Production is compressed to medium voltage network pressure in a little higher than urea plant with intermediate pressure compressor;
Cooling water pressure was separated device cooling, hydrolysis during b, the tail gas after will compressing imported.
Above-mentioned intermediate pressure compressor can be multi-stage compression, and each inter-stage is provided with interstage cooler.Above-mentioned interstage cooler can guarantee that the temperature of compressor imports at different levels can be too not high, in order to avoid the compressor damage of components, influence is running continuously, and gas is compressed to medium voltage network pressure in a little higher than urea plant at compressor outlet, so that can enter absorption.
Adopt this method to handle melamine producing tail gas, be the pressure of pressing desorb during tail gas is forced into, cooling water pressure is separated device cooling, hydrolysis in directly importing, having saved tail gas absorbs and two reversible processes of middle pressure desorb, a small amount of melamine accessory substance such as the melamine amide-type carried secretly in the tail gas have been removed, biurets etc., these accessory substances and water reaction generate ammonia and carbon dioxide.Ammonia and carbon dioxide gas bulk absorption become undersaturated first ammonium liquid under the medium voltage network pressure in urea plant.
Beneficial effect of the present invention in sum mainly contain following some: 1, the technological process of production is simplified, and tail gas is absorbed and two reversible processes of middle pressure desorb are saved, and the pressure of pressure desorb exit gas saves multiple devices in directly with compressor gas being boosted to; 2, easy to operate, control loop reduces, and is easy to control and operation; 3, energy consumption reduces, owing to save multiple devices, maintenance of equipment and maintenance reduce, and can loss-rate reduce 20-25% originally through measuring and calculating the present invention; 4, the device driving rate improves, and process simplification is reduced by restraining factors, and driving rate improves 3-5%.
Description of drawings:
Below in conjunction with accompanying drawing above-mentioned explanation further is illustrated again
Fig. 1 is the prior art processes flow chart
Fig. 2 is a process chart of the present invention
The specific embodiment;
As shown in Figure 2, the equipment of handling melamine producing tail gas among the present invention mainly comprises intermediate pressure compressor 5 and cooling hydrolyzer 6, intermediate pressure compressor 5 can be multi-stage compression, as adopting the level Four compression, and each inter-stage is provided with interstage cooler 7, above-mentioned interstage cooler can guarantee that the temperature of compressor imports at different levels can be too not high, in order to avoid the compressor damage of components, influence is running continuously.Tail gas pressure after intermediate pressure compressor 5 compression pressurization should be a little more than urea plant in medium voltage network pressure (as the 2.0-2.5 MPa), temperature is 240-250 degree centigrade and is hydrolyzed, absorbs, cools off so that can enter cooling hydrolyzer 6 smoothly.
Claims (4)
1, a kind of method of handling melamine producing tail gas is characterized in that comprising the steps:
A, the tail gas that produces in the Melamine Production is compressed to medium voltage network pressure in a little higher than urea plant with intermediate pressure compressor;
Cooling water pressure was separated device cooling, hydrolysis during b, the tail gas after will compressing imported.
2, a kind of equipment of handling melamine producing tail gas as claim 1 described method that uses is characterized in that including intermediate pressure compressor and the cooling hydrolyzer that order connects.
3, the equipment of processing melamine producing tail gas according to claim 2 is characterized in that: described intermediate pressure compressor adopts the form of multi-stage compression, and each inter-stage is provided with interstage cooler.
4, the method for processing melamine producing tail gas according to claim 1 is characterized in that: described tail gas pressure after the intermediate pressure compressor compression is the 2.0-2.5 MPa, and temperature is 240-250 degree centigrade.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510104439 CN1772339A (en) | 2005-10-29 | 2005-10-29 | Method and apparatus for treating melamine producing tail gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510104439 CN1772339A (en) | 2005-10-29 | 2005-10-29 | Method and apparatus for treating melamine producing tail gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1772339A true CN1772339A (en) | 2006-05-17 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510104439 Pending CN1772339A (en) | 2005-10-29 | 2005-10-29 | Method and apparatus for treating melamine producing tail gas |
Country Status (1)
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| CN (1) | CN1772339A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103145635A (en) * | 2013-03-05 | 2013-06-12 | 中国五环工程有限公司 | Tail gas recycling process and system for melamine production device |
| WO2013185412A1 (en) * | 2012-06-13 | 2013-12-19 | 北京烨晶科技有限公司 | Method for separating mixed gas of ammonia and carbon dioxide |
| CN106349117A (en) * | 2016-08-27 | 2017-01-25 | 湖北宜化集团有限责任公司 | Method for treating melamine tail gas |
-
2005
- 2005-10-29 CN CN 200510104439 patent/CN1772339A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013185412A1 (en) * | 2012-06-13 | 2013-12-19 | 北京烨晶科技有限公司 | Method for separating mixed gas of ammonia and carbon dioxide |
| CN103145635A (en) * | 2013-03-05 | 2013-06-12 | 中国五环工程有限公司 | Tail gas recycling process and system for melamine production device |
| CN103145635B (en) * | 2013-03-05 | 2014-12-03 | 中国五环工程有限公司 | Tail gas recycling process and system for melamine production device |
| CN106349117A (en) * | 2016-08-27 | 2017-01-25 | 湖北宜化集团有限责任公司 | Method for treating melamine tail gas |
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