CN103432847A - Method and device for processing tail gas of ammonium nitrate prilling tower - Google Patents
Method and device for processing tail gas of ammonium nitrate prilling tower Download PDFInfo
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- CN103432847A CN103432847A CN2013104134142A CN201310413414A CN103432847A CN 103432847 A CN103432847 A CN 103432847A CN 2013104134142 A CN2013104134142 A CN 2013104134142A CN 201310413414 A CN201310413414 A CN 201310413414A CN 103432847 A CN103432847 A CN 103432847A
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- tail gas
- ammonium nitrate
- granulation tower
- washer
- flash evaporator
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Abstract
The invention discloses a method for processing tail gas of an ammonium nitrate prilling tower. The method comprises the following steps: introducing the tail gas from the top of the ammonium nitrate prilling tower into a washer; dissolving powered ammonium nitrate in the tail gas in a washing solution in the washer; discharging the tail gas after washing into the atmosphere; feeding the washing solution in which the powered ammonium nitrate is absorbed into a one-stage evaporator and a two-stage evaporator for evaporation; evaporating a part of water and ammonium in the washing solution into gas and separating the gas from the ammonium nitrate; and after concentrating the ammonium nitrate in the washing solution, feeding back into the prilling tower for prilling. According to the method, the powered ammonium nitrate in the tail gas is recycled, the emission of harmful substances in the tail gas is reduced, the method is safe and environment-friendly, and the yield of ammonium nitrate is increased at the same time.
Description
Technical field
The present invention relates to a kind of exhaust gas treating method in a kind of chemical process, particularly relate to a kind of method and device for the treatment of normal pressure neutralisation ammonium nitrate granulation tower tail gas.
Background technology
The normal pressure neutralisation is produced in the ammoniumnitrate prill device, contain dust in the tail gas of ammonium nitrate granulation tower discharge, its main component is powdery ammonium nitrate, concentration is 83.3mg/m3, this part tail gas is discharged by 55 meters aiutages, not only polluted environment, also caused the waste of ammonium nitrate, take produce per year ammonium nitrate device that 150,000 tons of tail gas amounts are 482000Nm3/h as, annual discharge powdery ammonium nitrate is 290 tons, the ammonium nitrate price is 2000 yuan in the market, and like this annual ammonium nitrate be discharged in atmosphere is worth and reaches 580,000 yuan.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of method for the treatment of normal pressure neutralisation ammonium nitrate granulation tower tail gas, and described method can reclaim the powdery ammonium nitrate in tail gas, has reduced the pollution to environment, has improved the output of ammonium nitrate.
A kind of method for the treatment of of nitric acid ammonium granulation tower tail gas, comprise the steps:
To pass into washer from ammonium nitrate granulation tower top tail gas out, powdery ammonium nitrate in described tail gas is dissolved in the cleaning solution in described washer, exhaust emissions after washing is to atmosphere, the described cleaning solution that absorbs powdery ammonium nitrate is sent in one section evaporimeter and flash evaporator and evaporated, a part of water in described cleaning solution and ammonia are evaporated to gas to be separated with ammonium nitrate, gas is transferred in described washer and together discharges with tail gas, and the ammonium nitrate in the cleaning solution in described flash evaporator obtains after concentrate being recycled in granulation tower carrying out granulation.
The method for the treatment of of nitric acid ammonium granulation tower tail gas of the present invention, wherein, after absorbing the described cleaning solution of powdery ammonium nitrate solution concentration being increased to 80% in described one section evaporimeter, deliver in described flash evaporator, and solution concentration is increased to more than 98%; The steam pressure of described one section evaporimeter is 0.02Mpa(table), vacuum is 77.3～80.7KPa; The steam pressure of described flash evaporator is that 1.0Mpa, vacuum are 82.8～85.3KPa.
The method for the treatment of of nitric acid ammonium granulation tower tail gas of the present invention, wherein, described cleaning solution is the condensate liquid that in production process, other devices produce, described condensate liquid is water.
A kind of device for the treatment of of nitric acid ammonium granulation tower tail gas, it is characterized in that: comprise the granulation tower of connecting successively by pipeline, washer, one section evaporimeter and flash evaporator, wherein, the arrival end of described washer is connected with the tail gas outlet at described granulation tower top, the port of export of described washer bottom is connected with the arrival end of one section evaporimeter, the port of export of described one section evaporimeter is connected with the arrival end of flash evaporator, and the port of export of described flash evaporator is connected with the arrival end of described granulation tower.
The method of the invention and device difference from prior art are:
Be provided with washer, one section evaporimeter and flash evaporator in the outlet of the tail gas at described granulation tower top, the powdery recover ammonium nitrate in tail gas is utilized, reduced the discharge of harmful substance in tail gas, safety and environmental protection has improved the output of ammonium nitrate simultaneously.One end evaporimeter and flash evaporator of series connection is set, lower because tower top washs the ammonium nitrate solution concentration of getting off, need dual circulation just can reach more than 98%.
Method and device below in conjunction with accompanying drawing to treatment of nitric acid ammonium granulation tower tail gas of the present invention are described further.
The accompanying drawing explanation
The structural representation of the device that Fig. 1 is treatment of nitric acid ammonium granulation tower tail gas of the present invention.
The specific embodiment
Embodiment 1
A kind of method for the treatment of of nitric acid ammonium granulation tower tail gas, comprise the steps:
To pass into washer from ammonium nitrate granulation tower top tail gas out, powdery ammonium nitrate in described tail gas is dissolved in the cleaning solution in described washer, exhaust emissions after washing is to atmosphere, the described cleaning solution that absorbs powdery ammonium nitrate is sent in one section evaporimeter and flash evaporator and evaporated, a part of water in described cleaning solution and ammonia are evaporated to gas to be separated with ammonium nitrate, gas is transferred in described washer and together discharges with tail gas, and the ammonium nitrate in the cleaning solution in described flash evaporator obtains after concentrate being recycled in granulation tower carrying out granulation.
Wherein, after absorbing the described cleaning solution of powdery ammonium nitrate solution concentration being increased to 80% in described one section evaporimeter, deliver in described flash evaporator, solution concentration is increased to more than 98%; The steam pressure of described one section evaporimeter is 0.02Mpa, and vacuum is 77.3～80.7KPa; The steam pressure of described flash evaporator is 1.0Mpa, and vacuum is 82.8～85.3KPa.Described cleaning solution is the condensate liquid that in production process, other devices produce, and described condensate liquid is water.
As shown in Figure 1, a kind of device for the treatment of of nitric acid ammonium granulation tower tail gas, comprise the granulation tower 1 of connecting successively by pipeline, washer 2, one section evaporimeter 3 and flash evaporator 4, wherein, the arrival end of described washer 2 is connected with the tail gas outlet at described granulation tower 1 top, the port of export of described washer 2 bottoms is connected with the arrival end of one section evaporimeter 3, the port of export of described one section evaporimeter 3 is connected with the arrival end of described flash evaporator 4, and the port of export of described flash evaporator 4 is connected with the arrival end of described granulation tower 1.
Above-described embodiment is described the preferred embodiment of the present invention; not scope of the present invention is limited; design under the prerequisite of spirit not breaking away from the present invention; various distortion and improvement that those of ordinary skills make technical scheme of the present invention, all should fall in the definite protection domain of the claims in the present invention book.
Claims (4)
1. the method for a treatment of nitric acid ammonium granulation tower tail gas, is characterized in that: comprise the steps:
To pass into washer from ammonium nitrate granulation tower top tail gas out, powdery ammonium nitrate in described tail gas is dissolved in the cleaning solution in described washer, exhaust emissions after washing is to atmosphere, the described cleaning solution that absorbs powdery ammonium nitrate is sent in one section evaporimeter and flash evaporator and evaporated, a part of water in described cleaning solution and ammonia are evaporated to gas to be separated with ammonium nitrate, gas is transferred in described washer and together discharges with tail gas, and the ammonium nitrate in the cleaning solution in described flash evaporator obtains after concentrate being recycled in granulation tower carrying out granulation.
2. the method for the treatment of of nitric acid ammonium granulation tower tail gas according to claim 1, it is characterized in that: after absorbing the described cleaning solution of powdery ammonium nitrate solution concentration being increased to 80% in described one section evaporimeter, deliver in described flash evaporator, solution concentration is increased to more than 98%; The steam pressure of described one section evaporimeter is 0.02Mpa, and vacuum is 77.3～80.7KPa; The steam pressure of described flash evaporator is 1.0Mpa, and vacuum is 82.8～85.3KPa.
3. the method for the treatment of of nitric acid ammonium granulation tower tail gas according to claim 1 and 2 is characterized in that: described cleaning solution is condensate liquids that in production process, other devices produce, and described condensate liquid is water.
4. the device of a treatment of nitric acid ammonium granulation tower tail gas, it is characterized in that: comprise the granulation tower (1) of connecting successively by pipeline, washer (2), one section evaporimeter (3) and flash evaporator (4), wherein, the arrival end of described washer (2) is connected with the tail gas outlet at described granulation tower (1) top, the port of export of described washer (2) bottom is connected with the arrival end of one section evaporimeter (3), the port of export of described one section evaporimeter (3) is connected with the arrival end of described flash evaporator (4), the port of export of described flash evaporator (4) is connected with the arrival end of described granulation tower (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310413414.2A CN103432847B (en) | 2013-09-10 | 2013-09-10 | A kind of method and device processing ammonium nitrate prill towers tail gas |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310413414.2A CN103432847B (en) | 2013-09-10 | 2013-09-10 | A kind of method and device processing ammonium nitrate prill towers tail gas |
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| CN103432847A true CN103432847A (en) | 2013-12-11 |
| CN103432847B CN103432847B (en) | 2016-08-03 |
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| CN201310413414.2A Expired - Fee Related CN103432847B (en) | 2013-09-10 | 2013-09-10 | A kind of method and device processing ammonium nitrate prill towers tail gas |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2192099A1 (en) * | 2008-11-28 | 2010-06-02 | Uhde Fertilizer Technology B.V. | Urea granulation process with an acidic scrubbing system and the subsequent integration of ammonium salt into urea granules |
| CN201962082U (en) * | 2010-12-31 | 2011-09-07 | 太原海力丰科技发展有限公司 | Ammonium nitrate solution concentration device |
| CN102350162A (en) * | 2011-07-22 | 2012-02-15 | 镇江市恒升达化工科技有限公司 | Tower top dust recovery device for urea granulation tower and recovery method for dust on top of urea granulation tower |
| US20130149230A1 (en) * | 2011-05-16 | 2013-06-13 | Anthony Matthew Johnston | Integrated process for producing ammonium nitrate |
-
2013
- 2013-09-10 CN CN201310413414.2A patent/CN103432847B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2192099A1 (en) * | 2008-11-28 | 2010-06-02 | Uhde Fertilizer Technology B.V. | Urea granulation process with an acidic scrubbing system and the subsequent integration of ammonium salt into urea granules |
| CN201962082U (en) * | 2010-12-31 | 2011-09-07 | 太原海力丰科技发展有限公司 | Ammonium nitrate solution concentration device |
| US20130149230A1 (en) * | 2011-05-16 | 2013-06-13 | Anthony Matthew Johnston | Integrated process for producing ammonium nitrate |
| CN102350162A (en) * | 2011-07-22 | 2012-02-15 | 镇江市恒升达化工科技有限公司 | Tower top dust recovery device for urea granulation tower and recovery method for dust on top of urea granulation tower |
Non-Patent Citations (1)
| Title |
|---|
| 李开选等: "硝铵装置降膜蒸发存在问题与改进措施", 《煤化工》 * |
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| CN103432847B (en) | 2016-08-03 |
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Inventor after: Wang Lili Inventor before: Wang Lili Inventor before: Song Lei Inventor before: Chai Feng |
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Effective date of registration: 20210413 Address after: 234000 No. 157, Xichang Road, Suzhou, Anhui Patentee after: WANBEI COAL-ELECTRICITY GROUP Co.,Ltd. Address before: 232038 Anhui Huainan Tian Jia An District Quanshan Anhui Huaihua Limited by Share Ltd technology research and Development Center Patentee before: ANHUI HUAIHUA Co.,Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
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Granted publication date: 20160803 Termination date: 20210910 |