CN110538540A - Water curtain type dust and ammonia removing system and process applying urea granulation tail gas - Google Patents
Water curtain type dust and ammonia removing system and process applying urea granulation tail gas Download PDFInfo
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- CN110538540A CN110538540A CN201910920922.7A CN201910920922A CN110538540A CN 110538540 A CN110538540 A CN 110538540A CN 201910920922 A CN201910920922 A CN 201910920922A CN 110538540 A CN110538540 A CN 110538540A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
- B01D50/40—Combinations of devices covered by groups B01D45/00 and B01D47/00
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Abstract
the invention discloses a water curtain type dust and ammonia removal system and process applying urea granulation tail gas, which are applied to the field of tail gas absorption, demisting and dust removal of a urea granulation tower, and the technical scheme is as follows: the device comprises a granulation tower and an absorption tower arranged outside the granulation tower, wherein a water curtain absorber is arranged at the air outlet of a louver at the top of the granulation tower along the periphery, the water curtain absorber is of a grid structure, one side of the water curtain absorber, which is far away from the granulation tower, is connected with a water curtain sprayer, the water curtain sprayer adopts a circular spraying structure, and the upper part of the water curtain sprayer, which is far away from the water curtain absorber, is connected with a baffle plate upward sprayer; has the technical effects that: the atomized washing liquid is prevented from being brought out of the granulation tower, urea liquid drops in saturated hot gas are ensured not to be brought into the atmosphere in the separation process, and a reliable water curtain absorber and a gas-water separation technology are adopted, so that secondary pollution is avoided.
Description
Technical Field
The invention relates to the field of tail gas absorption, demisting and dedusting of urea granulation towers, in particular to a water curtain type dedusting and ammonia removing system and process applying tail gas of urea granulation.
background
With the increasing shortage of energy resources, various industries are pushing clean production, and as fertilizer production enterprises, the clean production reduces the content of urea dust discharged from the tail gas of a urea prilling tower, and reduces ammonia discharge, and the like, which are increasingly paid attention by people. At present, domestic urea production enterprises basically adopt a prilling tower for prilling, and because the production process is imperfect, the content of urea dust and ammonia in tail gas emission of the prilling tower seriously exceeds the standard.
The urea granulation is that the temperature of the molten urea is reduced in a granulation tower for granulation, namely the molten urea is subjected to heat exchange with cold air sent from the bottom of the tower to be solidified into granules, the temperature of air flow is gradually increased in the rising process, dust is wrapped and carried by the air flow and is discharged from the top of the tower, and the temperature gradient between the bottom of the tower and the top of the tower forms a thermal pressure head which has the natural air draft effect and promotes the rising of the air flow. The urea granulation dust refers to dust formed during granulation in a granulation tower and dust formed during cooling of a fluidized bed. The components of the urea granulation dust are urea and ammonia, and if the urea granulation dust is not recycled, the urea granulation dust is lost and wasted, directly harms the greening sanitation and civilized production of a plant area and the body health of workers, and pollutes the environment. At present, the urea granulation dust is already brought into one of the environmental protection projects which must be treated by the country. The existing recovery methods are mostly single-item, such as mechanical dust removal technology, gravity dust removal, baffle type dust removal, centrifugal cyclone type dust removal, spray dust removal, cloth bag dust removal and the like. The mechanical dust removal has the defects that ammonia escape cannot be removed, the equipment operation cost is high, the spraying dust removal has the defects that the air draft of a fan is adopted to change the air flow speed of a granulation tower, the production quality of granulation is influenced, and the cloth bag dust removal has the defects of large pressure difference, high maintenance cost and the like.
Disclosure of Invention
the invention aims to provide a water curtain type system and a process for removing dust and ammonia by using urea granulation tail gas, which have the advantages that: the urea dust is dissolved in water by arranging the water curtain equipment, so that the urea dust is effectively and conveniently treated.
The technical purpose of the invention is realized by the following technical scheme: a water curtain type system and process for dedusting and removing ammonia by using urea granulation tail gas (1): the hot gas in the granulation tower carries urea dust, and enters a water curtain absorber through a side channel of the granulation room; (2): large-particle urea dust is dissolved and absorbed through water curtain spraying, then the urea dust enters a baffle plate group section for secondary absorption, baffled gas and micro dust are washed and absorbed in a baffle plate absorption section, and the urea dust enters a demister after two-section atomization spraying absorption; (3): gas and liquid enter the natural gravity separation space, are mixed with peripheral cold air entering from the demister, and further condense to obtain liquid drops containing urea particles; (4): the dust attached to the upper surface of the demister is locally sprayed and washed after the spraying and washing gas is emptied, so that the phenomenon that absorbed liquid drops are carried out outside the tower is avoided; (6): the urea hydrolysis waste liquid directly enters a cleaning spray head or is supplemented into a washing circulating tank for carrying out primary absorption liquid feeding action, the liquid enters a circulating liquid descending water channel through a collecting tank, and then enters a filtering device through a washing circulating pump to enter a spraying spray head absorption section, so that the liquid flows into the collecting tank; (6): after liquid is replenished into the washing circulation tank, the washing spray head on the upper part is opened to wash the demister, steam condensate is preferably replenished when liquid replenishing is started, the main purpose is to wash the crystallization part of the spray head, the upper washing spray head is closed after the upper demister is washed for about 3-5 minutes, the lower washing absorption spray head is restarted, the normal operation state is switched to, the steam condensate is closed, and the urea solution is started.
The invention is further configured to: the device comprises a granulation tower and an absorption tower arranged outside the granulation tower, wherein a water curtain absorber is arranged at the position of a louver air outlet at the top of the granulation tower along the periphery, the water curtain absorber is of a grid structure, one side of the water curtain absorber, which is far away from the granulation tower, is connected with a water curtain sprayer, the water curtain sprayer adopts a circular spraying structure, one side of the water curtain sprayer, which is far away from the water curtain absorber, is connected with a baffle plate upward sprayer, the baffle plate upward sprayer is fixedly connected with the inner wall of the absorption tower, a baffle plate absorber is arranged in a gap at one side of the baffle plate upward sprayer, which is far away from the water curtain sprayer, the baffle plate absorber is fixedly connected with the inner wall of the absorption tower, an absorption sprayer is arranged in a gap at the top side of the baffle plate absorber, the absorption sprayer is fixedly connected with the inner wall of the absorption tower, one side that the cascade sprayer was kept away from to the cascade absorber has the collecting vat through the pipeline intercommunication, the top that the inner wall of absorption tower is located the absorption sprayer is equipped with the defroster, a side gap that the absorption sprayer was kept away from to the defroster is equipped with the defogging sprayer, defogging sprayer fixed connection is at the inner wall of absorption tower, the defogging sprayer has fresh water pipeline with external intercommunication.
The invention is further configured to: the baffle plate upward sprayer is communicated with a washing circulating pump through a pipeline, the collecting tank is connected with a washing circulating tank through a pipeline, and the washing circulating tank is communicated with the washing circulating pump.
The invention is further configured to: the collecting tank is communicated with a urine recovery system, a water vapor system and a hydrolysis waste liquid system.
The invention is further configured to: the water curtain absorber is used for absorbing by dissolving water solution into urea particles in a collision way, the water curtain absorber is arranged in a circular water curtain type spraying way, the circular washing pump is used for dissolving, demisting and dedusting, the steam-supplemented condensate water or the desorption water wastewater is adopted for carrying out jet flow atomization to circularly wash dust, the urine with a certain concentration of 10% is circularly washed, the urine recovery system is used for concentrating, the proper steam condensate water is used as the supplemented water of the circulating washing water, and simultaneously the NH3 of tail gas can be absorbed and removed.
The invention is further configured to: the baffle plate absorber adopts a two-stage spraying absorption process, a spraying system for washing is arranged at the bottom of the baffle plate absorber, the spraying system sprays and washes the plate group upwards, gas passing through the baffle plate absorber enters the demister through a space section to remove mist and liquid drops and carry the mist, the demister adopts a baffling and demisting structure, the demister performs re-trapping treatment on dust-containing mist drops secondarily carried after absorption, and a local intermittent spraying setting mode is adopted at the upper part to perform spraying and washing for preventing dust accumulation at the interval between the baffle plates of the demister.
in conclusion, the invention has the following beneficial effects:
1. The invention provides a system and a process for removing dust and ammonia by using a water curtain of urea granulation tail gas, which avoid atomized washing liquid from being brought out of a granulation tower, ensure that urea liquid drops in saturated hot gas are not brought into the atmosphere in the separation process, and avoid secondary pollution by adopting a reliable water curtain absorber and a gas-water separation technology;
2. The design adopts a resistance-free water curtain absorber, the plate group adopts a design structure with small pressure resistance for absorption, atomization spraying is adopted on the spraying, the circulation quantity of spraying water is reduced, the pressure resistance of liquid is reduced, a deflection type demisting structure is adopted in a demisting section, and the design structure with small pressure resistance and good demisting effect is adopted;
2. The content of the particles discharged from the tail gas of the prilling tower is less than or equal to 30mg/Nm3, and the content of ammonia is less than or equal to 10mg/Nm3, thereby solving the phenomena of tailing and white fog of the tail gas of the prilling tower.
drawings
Fig. 1 is a schematic view of the overall structure of the present embodiment.
Reference numerals: 1. a demisting sprayer; 2. a demister; 3. an absorption spray thrower; 4. a baffling absorber; 5. the baffle plate is upward to the sprayer; 6. a water curtain sprayer; 7. a water curtain absorber; 8. collecting tank; 9. a washing circulation tank; 10. a washing circulating pump; 11. a urine recovery system; 12. a water vapor system and; 13. and (4) a hydrolysis waste liquid system.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Example (b): a water curtain type system and process for removing dust and ammonia by using urea granulation tail gas are disclosed as figure 1, (1): the hot gas in the granulation tower carries urea dust, and enters the water curtain absorber 7 through a side channel of the granulation room; (2): large-particle urea dust is dissolved and absorbed through water curtain spraying, then the urea dust enters the baffle plate group section for secondary absorption, the baffled gas and the tiny dust are washed and absorbed in the baffle plate absorption section, and the urea dust enters the demister 2 after two-section atomization spraying absorption; (3): gas and liquid enter the natural gravity separation space, are mixed with peripheral cold air entering the demister 2, and further condense to obtain liquid drops containing urea particles; (4): the gas and the liquid enter the natural gravity separation space to be mixed with the peripheral cold air entering the demister 2, and further the liquid drops containing urea particles are condensed; (5): then the dust attached to the upper surface of the demister 2 is subjected to local spraying and washing through the emptying of the spraying and washing gas, so that the phenomenon that absorbed liquid drops are carried out outside the tower is avoided; (6): the urea hydrolysis waste liquid directly enters a cleaning nozzle or is supplemented into a washing circulating tank 9 for carrying out primary absorption liquid feeding action, the liquid enters a circulating liquid descending water channel through a collecting tank 8, and then enters a filtering device through a washing circulating pump 10 to enter a spraying nozzle absorption section, and the liquid flows into the collecting tank 8; (7): after the liquid is supplemented into the washing circulation tank 9, the washing spray nozzle at the upper part is opened to wash the demister 2, steam condensate is preferably supplemented when liquid supplementation is started, the main purpose is to wash the crystallization part of the spray nozzle, the upper washing spray nozzle is closed after the upper demister 2 is washed for about 3-5 minutes, the lower washing absorption spray nozzle is started again, the normal operation state is switched, the steam condensate is closed, and the urea solution is started.
as shown in figure 1, the device comprises a granulation tower and an absorption tower arranged outside the granulation tower, a water curtain absorber 7 is arranged at the position of a louver air outlet at the top of the granulation tower along the periphery, the water curtain absorber 7 is of a grid structure, one side of the water curtain absorber 7, which is far away from the granulation tower, is connected with a water curtain sprayer 6, the water curtain sprayer 6 adopts a circular spraying structure, one side of the water curtain sprayer 6, which is far away from the water curtain absorber 7, is connected with a baffle plate upward sprayer 5, the baffle plate upward sprayer 5 is fixedly connected with the inner wall of the absorption tower, a baffle plate absorber is arranged in a gap at one side of the baffle plate upward sprayer 5, which is far away from the water curtain sprayer 6, the baffle plate absorber is fixedly connected with the inner wall of the absorption tower, an absorption sprayer 3 is arranged in a gap at the top side of the baffle plate absorber, the absorption sprayer 3, one side that cascade absorber 7 kept away from cascade sprayer 6 has collecting vat 8 through the pipeline intercommunication, and the top that the inner wall of absorption tower is located absorption sprayer 3 is equipped with defroster 2, and defroster 2 keeps away from a side gap of absorption sprayer 3 and is equipped with defogging sprayer 1, and defogging sprayer 1 fixed connection is at the inner wall of absorption tower, and defogging sprayer 1 has fresh water pipeline with external intercommunication.
As shown in fig. 1, the baffle upward sprayer 5 is communicated with a washing circulating pump 10 through a pipeline, the collecting tank 8 is connected with a washing circulating tank 9 through a pipeline, the washing circulating tank 9 is communicated with the washing circulating pump 10, and the collecting tank 8 is communicated with a urine recovery system 11, a water vapor system and a hydrolysis waste liquid system 12 13.
As shown in figure 1, the water curtain absorber 7 is used for absorbing urea particles through the collision of water solution dissolved in the urea particles, the water curtain absorber 7 is arranged in a circular water curtain type spraying mode, a circular washing pump is used for dissolving, demisting and dedusting, supplemented steam condensate water or desorbed water wastewater is used for carrying out jet flow atomization to circularly wash dust, urine with a certain concentration of 10% is circularly washed, a urine recovery system 11 is used for concentrating, appropriate steam condensate water is used as supplemented water of circulating washing water, and NH3 of tail gas can be absorbed and removed.
As figure 1, the baffling board absorber has adopted the absorption technology that the two-stage sprayed, the bottom of baffling board absorber has set up the spraying system who washes upwards to spray and wash to the group, the gas through baffling board absorber gets into defroster 2 through the space section and carries out defogging gas and get rid of the liquid drop and smuggle secretly, defroster 2 has adopted baffling defogging structure, defroster 2 carries out the entrapment again to the dust-laden fog drop of absorbing back secondary smuggleing secretly, for the dust accumulation of the baffling board interval that prevents defroster 2, the intermittent type that has adopted in the upper portion sprays the mode of setting, spray and wash.
the method comprises the following operation steps: hot gas in the granules enters the plate group dust removal area through the side surface of the granulation room and enters the demister 2 after two-stage atomization spraying absorption, then the gas and the liquid enter the natural gravity separation space to be mixed with peripheral cold air entering the baffling demister 2, liquid drops containing urea particles after further condensation are sprayed and washed, and then the gas is discharged.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (6)
1. A water curtain type system and a process for dedusting and removing ammonia by using urea granulation tail gas are characterized in that: the method comprises the following steps:
(1): the hot gas in the granulation tower carries urea dust, and the urea dust enters a water curtain absorber (7) through a side channel of the granulation room;
(2): large-particle urea dust is dissolved and absorbed through water curtain spraying, then the urea dust enters a baffle plate group section for secondary absorption, baffled gas and micro dust are washed and absorbed in a baffle plate absorption section, and the urea dust enters a demister (2) after two-section atomization spraying absorption;
(3): gas and liquid enter the natural gravity separation space and are mixed with peripheral cold air entering the demister (2), and liquid drops containing urea particles are further condensed;
(4): then, the dust attached to the upper surface of the demister (2) is subjected to local spray washing by emptying the spray washing gas, so that the phenomenon that absorbed liquid drops are carried out of the tower is avoided;
(5): urea hydrolysis waste liquid directly enters a cleaning spray head or is supplemented into a washing circulating tank (9) for carrying out primary absorption liquid feeding action, and the liquid enters a circulating liquid descending water channel through a collecting tank (8) and then enters a filtering device through a washing circulating pump (10) to enter a spraying spray head absorption section to flow into the collecting tank (8);
(6): after liquid is supplemented into the washing circulation tank (9), the washing spray nozzle on the upper part is opened to wash the demister (2), steam condensate is preferably supplemented when liquid supplementation is started, the main purpose is to wash the crystallization part of the spray nozzle, the washing spray nozzle on the upper part is closed after the demister (2) on the upper part is washed for about 3-5 minutes, the washing absorption spray nozzle on the lower part is restarted, the normal operation state is switched to, the steam condensate is closed, and the urea solution is started.
2. The system and the process for removing dust and ammonia by using the water curtain of the tail gas of urea granulation as claimed in claim 1, wherein the system comprises: the device comprises a granulation tower and an absorption tower arranged outside the granulation tower, wherein a water curtain absorber (7) is arranged at the position of a louver air outlet at the top of the granulation tower along the periphery, the water curtain absorber (7) is of a grid structure, one side, far away from the granulation tower, of the water curtain absorber (7) is connected with a water curtain sprayer (6), the water curtain sprayer (6) adopts a circular spraying structure, one side, far away from the water curtain absorber (7), of the water curtain sprayer (6) is connected with an upward baffle plate sprayer (5), the upward baffle plate sprayer (5) is fixedly connected to the inner wall of the absorption tower, a baffle plate absorber is arranged in a gap at one side, far away from the water curtain sprayer (6), of the upward baffle plate sprayer (5) is fixedly connected to the inner wall of the absorption tower, an absorption sprayer (3) is arranged in a gap at the top side of the baffle plate absorber, and the absorption sprayer (3), absorption spray thrower (3) adopt circular spray structure, absorption spray thrower (3) are with the mode of spraying of concentric circles, one side that cascade spray thrower (6) was kept away from in cascade absorber (7) has collecting vat (8) through the pipeline intercommunication, the top that the inner wall of absorption tower is located absorption spray thrower (3) is equipped with defroster (2), one side clearance that absorption spray thrower (3) were kept away from in defroster (2) is equipped with defogging spray thrower (1), defogging spray thrower (1) fixed connection is at the inner wall of absorption tower, defogging spray thrower (1) has fresh water pipeline with external intercommunication.
3. The system and the process for removing dust and ammonia by using the water curtain of the tail gas of urea granulation as claimed in claim 2, wherein: the baffle plate upward sprayer (5) is communicated with a washing circulating pump (10) through a pipeline, the collecting tank (8) is connected with a washing circulating tank (9) through a pipeline, and the washing circulating tank (9) is communicated with the washing circulating pump (10).
4. the system and the process for removing dust and ammonia by using the water curtain of the tail gas of urea granulation as claimed in claim 2, wherein: the collecting tank (8) is communicated with a urine recovery system (11), a water vapor system and a hydrolysis waste liquid system (12) (13).
5. The system and the process for removing dust and ammonia by using the water curtain of the tail gas of urea granulation as claimed in claim 2, wherein: the urea particle collision absorption is carried out through the dissolution of aqueous solution on the water curtain absorber (7), the water curtain absorber (7) is arranged in a circular water curtain type spraying mode, the circular washing pump is used for dissolving, demisting and dedusting, the steam-supplemented condensate water or the desorption water wastewater is adopted for carrying out jet flow atomization to circularly wash dust, the urine with a certain concentration of 10% is circularly washed, the urine recovery system (11) is used for concentrating, the appropriate steam-supplemented condensate water is used as the supplement water of the circular washing water, and simultaneously the NH3 of the tail gas can be absorbed and removed.
6. The system and the process for removing dust and ammonia by using the water curtain of the tail gas of urea granulation as claimed in claim 2, wherein: the baffle plate absorber adopts a two-stage spraying absorption process, a spraying system for washing is arranged at the bottom of the baffle plate absorber, the baffle plate group is sprayed upwards to be washed, gas passing through the baffle plate absorber enters the demister (2) through a space section to remove mist and liquid drops, the demister (2) adopts a baffling demisting structure, the demister (2) carries out re-trapping treatment on dust-containing mist drops secondarily entrained after absorption, and a local intermittent spraying setting mode is adopted at the upper part for preventing dust accumulation of baffle plate intervals of the demister (2) so as to carry out spraying washing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910920922.7A CN110538540A (en) | 2019-09-26 | 2019-09-26 | Water curtain type dust and ammonia removing system and process applying urea granulation tail gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910920922.7A CN110538540A (en) | 2019-09-26 | 2019-09-26 | Water curtain type dust and ammonia removing system and process applying urea granulation tail gas |
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| CN110538540A true CN110538540A (en) | 2019-12-06 |
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| CN201910920922.7A Pending CN110538540A (en) | 2019-09-26 | 2019-09-26 | Water curtain type dust and ammonia removing system and process applying urea granulation tail gas |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111085144A (en) * | 2019-12-31 | 2020-05-01 | 安徽六国化工股份有限公司 | Tail gas treatment device for urea prilling tower |
| CN112473552A (en) * | 2020-11-17 | 2021-03-12 | 青岛伊莱新材料有限公司 | Dust separation and collection system of prilling tower |
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| CN112473552A (en) * | 2020-11-17 | 2021-03-12 | 青岛伊莱新材料有限公司 | Dust separation and collection system of prilling tower |
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Application publication date: 20191206 |