CN102058995A - Utilization method for dry waste gas in ammonia sulfate production process - Google Patents
Utilization method for dry waste gas in ammonia sulfate production process Download PDFInfo
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- CN102058995A CN102058995A CN 201010610307 CN201010610307A CN102058995A CN 102058995 A CN102058995 A CN 102058995A CN 201010610307 CN201010610307 CN 201010610307 CN 201010610307 A CN201010610307 A CN 201010610307A CN 102058995 A CN102058995 A CN 102058995A
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- waste gas
- liquefied ammonia
- steam
- ammonia
- sulfate production
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Abstract
The invention discloses a utilization method for dry waste gas in an ammonia sulfate production process. The method comprises the following steps of: arranging a special liquid ammonia evaporator and a condensate pump in a waste gas scrubbing and discharging system; feeding the dry waste gas into a venturi scrubber by using a fan to scrub off dust residues in the waste gas; feeding purified waste gas into the liquid ammonia evaporator to indirectly exchange heat with liquid ammonia through countercurrent flow, wherein the purified waste gas is about 90 degrees before entering the liquid ammonia evaporator, steam in the waste gas is cooled, and the liquid ammonia is evaporated by sensible heat discharged by steam cooling and condensation heat of the steam to obtain gaseous ammonia required for producing ammonia sulfate; adsorbing granular components in the waste gas by using condensed water for settlement and discharging together with the waste gas; and pumping the condensed water into the venturi scrubber by using the condensate pump to serve as washing water for reutilization. By the method, primary steam is substituted by waste heat of the waste gas, the using amount of the steam is reduced, and waste gas emission is reduced; the produced condensed water substitutes process water for supplement; the using amount of the process water is reduced, and the requirements of recycling economy are met; and the method is suitable for ammonia sulfate production enterprises.
Description
[technical field]
The present invention relates to stram condenser, also relate to admixture of gas, relate in particular to the recycling of the dry waste gas in the ammonium sulfate production process by condensation separation steam wherein.
[background technology]
Toxic emission meeting influence and destruction people's work, life, health, equipment, property and ecological environment.Reduce discharge amount of exhaust gas, not only can reduce environmental pollution, and the reasonable resources utilization can be guaranteed society and sustainable development of economy.The main processing method of waste gas has at present: condensation method, absorption process, firing method, catalysis method, absorption absorption method etc.In the ammonium sulfate production process, drying process has waste gas to produce, and this waste gas adopts absorption process, firing method, catalysis method, absorption absorption method all to have the shortcoming that equipment investment is big, operating cost is high.
In Chinese patent database, the patent that relates to dry exhaust gas utilization has: No. 97229931.9 " the water organic matter is dry to be produced exhaust air deodorization and reclaim the nitrogen device ", No. 201010120724.1 " with the air cooling system of moisture content and Waste Heat Recovery utilization in the waste gas behind the dry materials ", No. 201020126637.2 " with the air cooling system of moisture content and Waste Heat Recovery utilization in the waste gas behind the dry materials ".These patented technologies can not be used for the ammonium sulfate production process.Up to now, the report that does not still have drying process exhaust gas utilization in the ammonium sulfate production process.
[summary of the invention]
The object of the present invention is to provide the method for utilizing of dry waste gas in a kind of ammonium sulfate production process, waste gas as resource reutilization, is solved the problem that toxic emission reaches criterion of acceptability simultaneously.
The inventor considers that the waste gas that drying process produces in the ammonium sulfate production process contains a large amount of water vapours, the advantage that the liquid that adopts the condensation absorption method to have exhaust gas utilization, condensation utilizes again, utilize the condensation absorption method to carry out heat exchange, thereby exhausted air quantity and composition all change, and can solve waste gas pollution control and treatment and utilize problem.
Therefore, the method for utilizing of dry waste gas is in the ammonium sulfate production process that provides of inventor: in original waste gas washing, exhaust system a special liquefied ammonia evaporimeter and a condensate pump are set; Dry waste gas is sent into Venturi scrubber with blower fan, and the dirt slag in the flush away waste gas makes waste gas purification; The temperature of waste gas before entering the liquefied ammonia evaporimeter must be controlled at about 90 ℃, enter liquefied ammonia evaporimeter and liquefied ammonia and carry out the adverse current indirect heat exchange, steam in the waste gas is cooled, the sensible heat that its temperature decline is emitted and the condensation heat of steam liquefy water make the liquefied ammonia evaporation, obtain the gas ammonia that ammonium sulfate production needs; The particulate component sedimentation that the while condensed water also adsorbs waste gas is discharged with waste gas; Condensed water is squeezed into Venturi scrubber with condensate pump and is utilized as wash water again.
Above-mentioned liquefied ammonia evaporimeter is a pipe heat exchanger, and waste gas is cooling in pipe, and liquefied ammonia heats outside managing.
The exhaust gas discharging amount is constant under the nominal situation, and in order fully to guarantee the evaporation of liquefied ammonia, by heat balance, the temperature of waste gas before entering the liquefied ammonia evaporimeter must be controlled at about 90 ℃, satisfies liquefied ammonia evaporation requirement.
Method of the present invention can reduce discharge amount of exhaust gas, can heat liquefied ammonia again, has realized that waste gas residual heat replaces primary steam, has reduced steam consumption, and discharge amount of exhaust gas reduces simultaneously; The condensed water that produces can also replace technology moisturizing utilization, reduces the consumption of steam consumption and fresh water (FW), and the utilization again of waste gas meets the requirement of recycling economy.Be applicable to ammonium sulfate manufacturing enterprise.
[description of drawings]
Accompanying drawing is the schematic flow sheet of the inventive method.1 is the coal dust fluidized bed furnace among the figure, and 2 is drying machine, and 3 is blower fan, and 4 is Venturi scrubber, and 5 is the liquefied ammonia evaporimeter, and 6 is condensate pump, and 7 is sewage pump, and 8 is the tail gas blow-down pipe.
[specific embodiment]
Embodiment:
Phosphate fertilizer plant of Wengfu Group Co., Ltd. ammonium sulfate development project " granular ammonium sulfate device ", as shown in drawings, the hot gas that fluidized bed furnace 1 is produced is sent into drying machine 2 and is used for dry ammonium sulfate product, the waste gas that this process produces is sent into Venturi scrubber 4 washing back dischargings with blower fan 3, sewage after the washing is sent into Sewage Disposal with sewage pump 7, handles back up to standard by 8 dischargings of tail gas blow-down pipe.Company has taked following technical measures: in waste gas washing, exhaust system a special liquefied ammonia evaporimeter 5 and a condensate pump 6 are set; The waste gas that produces in the ammonium sulfate production dry run is sent into Venturi scrubber 4 with blower fan 3, dirt slag in the flush away waste gas, make waste gas purification, the temperature of purified waste gas before entering the liquefied ammonia evaporimeter must be about 90 ℃, enter liquefied ammonia evaporimeter 5, carry out the adverse current indirect heat exchange with liquefied ammonia, the steam in the waste gas is cooled, the sensible heat that its temperature decline is emitted and the condensation heat of steam liquefy water make the liquefied ammonia evaporation, obtain the gas ammonia that ammonium sulfate production needs; The particulate component sedimentation that the while condensed water also adsorbs waste gas is discharged from the tail gas blow-down pipe with waste gas; Condensed water is squeezed into Venturi scrubber with condensate pump 6 and is utilized as wash water again.
By these technical measures, every 1t liquefied ammonia can cool off the waste gas of 10000kg.And ammonium sulfate liquefied ammonia evaporation per hour will use steam 5400kg, use waste gas heating liquefied ammonia instead after, satisfy the liquefied ammonia evaporation fully with heat, about 40,000 tons of year saving steam; Save 100,000 tons of wash waters, amount to and save 1,800,000 RMB.
Claims (3)
- In the ammonium sulfate production process dry waste gas utilize method, it is characterized in that this method is: in original waste gas washing, exhaust system, a special liquefied ammonia evaporimeter and a condensate pump are set; Dry waste gas is sent into Venturi scrubber with blower fan, and the dirt slag in the flush away waste gas makes waste gas purification; The temperature of purified waste gas before entering the liquefied ammonia evaporimeter must be about 90 ℃, enter liquefied ammonia evaporimeter and liquefied ammonia and carry out the adverse current indirect heat exchange, steam in the waste gas is cooled, the sensible heat that its temperature decline is emitted and the condensation heat of steam liquefy water make the liquefied ammonia evaporation, obtain the gas ammonia that ammonium sulfate production needs; The particulate component sedimentation that the while condensed water also adsorbs waste gas is discharged with waste gas; Condensed water is squeezed into Venturi scrubber with condensate pump and is utilized as wash water again.
- 2. the method for claim 1 is characterized in that described liquefied ammonia evaporimeter is a pipe heat exchanger, and waste gas is cooling in pipe, and liquefied ammonia heats outside managing.
- 3. the method for claim 1 is characterized in that the discharge capacity of described waste gas under nominal situation is constant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010610307 CN102058995A (en) | 2010-12-29 | 2010-12-29 | Utilization method for dry waste gas in ammonia sulfate production process |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010610307 CN102058995A (en) | 2010-12-29 | 2010-12-29 | Utilization method for dry waste gas in ammonia sulfate production process |
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| CN102058995A true CN102058995A (en) | 2011-05-18 |
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| CN 201010610307 Pending CN102058995A (en) | 2010-12-29 | 2010-12-29 | Utilization method for dry waste gas in ammonia sulfate production process |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2576308Y (en) * | 2002-10-26 | 2003-10-01 | 宜兴市格兰特干燥浓缩设备有限公司 | Evaporating apparatus utilizing process waste-gas as heat-resource |
| CN101244848A (en) * | 2007-02-14 | 2008-08-20 | 广汉欣欣实业有限公司 | On-site comprehensive approach for wastewater, artesian well, waste slurry and engine waste gas |
| CN101648713A (en) * | 2009-07-23 | 2010-02-17 | 瓮福（集团）有限责任公司 | Method for producing granular ammonium sulfate |
-
2010
- 2010-12-29 CN CN 201010610307 patent/CN102058995A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2576308Y (en) * | 2002-10-26 | 2003-10-01 | 宜兴市格兰特干燥浓缩设备有限公司 | Evaporating apparatus utilizing process waste-gas as heat-resource |
| CN101244848A (en) * | 2007-02-14 | 2008-08-20 | 广汉欣欣实业有限公司 | On-site comprehensive approach for wastewater, artesian well, waste slurry and engine waste gas |
| CN101648713A (en) * | 2009-07-23 | 2010-02-17 | 瓮福（集团）有限责任公司 | Method for producing granular ammonium sulfate |
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Application publication date: 20110518 |