CN210521816U - Ammonia stripping tower and use its urea apparatus for producing - Google Patents
Ammonia stripping tower and use its urea apparatus for producing Download PDFInfo
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- CN210521816U CN210521816U CN201921214310.8U CN201921214310U CN210521816U CN 210521816 U CN210521816 U CN 210521816U CN 201921214310 U CN201921214310 U CN 201921214310U CN 210521816 U CN210521816 U CN 210521816U
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Abstract
The utility model belongs to an ammonia stripping tower and a urea production device using the same; the ammonia stripping tower comprises an ammonia stripping tower body, a gas outlet pipeline is arranged at the top of the ammonia stripping tower body, a molten urea outlet pipeline is arranged at the bottom of the ammonia stripping tower body, a liquid distribution plate is arranged at the upper part in the ammonia stripping tower body, a baffle is arranged at the lower part of the liquid distribution plate, a gas distribution plate is arranged at the lower part in the ammonia stripping tower body, a plurality of liquid distributors with openings at the upper and lower ends are arranged between the liquid distribution plate and the gas distribution plate, distribution holes are formed in the outer wall of the liquid distributor between the liquid distribution plate and the baffle, a molten urea inlet pipeline is arranged on the ammonia stripping tower body between the liquid distribution plate and the baffle, and a low-pressure steam inlet pipeline is arranged on the ammonia stripping tower body between the baffle; has the advantages of low production and equipment investment and effective recovery of ammonia on the premise of reducing the ammonia content in the tail gas of the urea prilling tower to 30mg/m for heavy planting.
Description
Technical Field
The utility model belongs to the technical field of urea production, concretely relates to can make ammonia content in the urea prilling tower tail gas reduce an ammonia stripping tower of 30mg/m and use its urea apparatus for producing.
Background
At present, the national nitrogen fertilizer production capacity reaches about 8000 million tons, and domestic large, medium and small urea enterprises basically adopt a prilling tower to prill urea; urea, also known as carbamide, is a white crystal, is an organic compound consisting of carbon, nitrogen, oxygen and hydrogen, is a white crystal, is a main nitrogen-containing end product of in-vivo protein decomposition of mammals and certain fishes, and is also a nitrogen fertilizer with the highest nitrogen content at present. As a neutral fertilizer, the urea is suitable for various soils and plants, is a chemical nitrogen fertilizer with larger use amount at present, and is synthesized industrially by ammonia gas and carbon dioxide under certain conditions.
In the synthesis reaction of urea, since the reaction between ammonia and carbon dioxide is an exothermic process, in order to maintain a proper temperature, it is general to use a method of adding an excessive amount of ammonia during the reaction to control a proper reaction temperature. Because the urea solution sent to the urea granulation unit contains a certain amount of free ammonia and ammonia generated by biuret formation from urea in the conveying process, the granulation tail gas contains a large amount of ammonia and urea dust, 660g of ammonia is necessarily generated by rough calculation when 1 ton of urea is produced, and the ammonia emission concentration in the tail gas of the granulation tower is about 66mg/m when the cooling air volume required by 1 ton of urea is 10000 cubic meters, and about 264 tons of ammonia is emitted to the atmosphere every year according to the granulation tower producing 40 ten thousand tons every year, so that the serious influence on the atmospheric environment is caused, and the waste is great for enterprises.
At present, no sufficient theory has proved that the ammonia in the tail gas of the prilling tower can be reduced to be within 30 mg/cubic meter by the existing technology, the method which is usually adopted by the industry for the emission of the tail gas is to wash the tail gas by water washing and filling materials, and the method can only absorb part of dust in the tail gas and has little effect on the ammonia in the tail gas.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the defect among the prior art, and provide an ammonia stripping tower that structural design is simple reasonable, production and equipment investment are low, can high-efficiently retrieve it simultaneously in reducing ammonia content in the granulation tail gas and use its urea apparatus for producing.
The purpose of the utility model is realized like this: the ammonia stripping tower comprises an ammonia stripping tower body, wherein a gas outlet pipeline is arranged at the top of the ammonia stripping tower body, a molten urea outlet pipeline is arranged at the bottom of the ammonia stripping tower body, a liquid distribution plate is arranged at the inner upper part of the ammonia stripping tower body, a baffle is arranged at the lower part of the liquid distribution plate, a gas distribution plate is arranged at the inner lower part of the ammonia stripping tower body, a plurality of liquid distributors with openings at the upper and lower ends are arranged between the liquid distribution plate and the gas distribution plate, distribution holes are formed in the outer wall of the liquid distributors between the liquid distribution plate and the baffle, a molten urea inlet pipeline is arranged on the ammonia stripping tower body between the liquid distribution plate and the baffle, a low-pressure steam inlet pipeline is arranged on the ammonia stripping tower body between the baffle and the gas distribution plate, and a condensate outlet pipeline is arranged at the lower part of one side of the ammonia stripping tower body; the ammonia stripping tower body at the lower part of the gas distribution plate is provided with a carbon dioxide gas pipeline.
Further, the gas outlet pipeline is connected with a low-pressure recovery device of the urea main device through a valve.
Further, the distribution holes are formed in the outer wall of the liquid distributor close to one end of the baffle.
Furthermore, a plurality of distribution holes are formed in the outer wall of the liquid distributor.
Further, the low-pressure steam inlet pipeline is arranged at the upper part of the other side of the ammonia stripping tower body.
Further, the low-pressure steam inlet pipeline is connected with a low-pressure steam pipe network.
Further, the condensate outlet pipe is connected with a condensate storage tank.
Furthermore, the liquid distribution plate and the gas distribution plate are respectively provided with air holes at the positions corresponding to the openings at the upper and lower ends of the liquid distributor, the positions corresponding to the lower parts of the air holes of the gas distribution plate are provided with outlets of carbon dioxide gas pipelines, and the inlets of the carbon dioxide gas pipelines are connected with a carbon dioxide pipe network.
The urea production device comprises a urea two-stage evaporation separator, wherein the urea two-stage evaporation separator is connected with a molten urea inlet pipeline of an ammonia stripping tower through a melting pump, and a molten urea outlet pipeline of the ammonia stripping tower is connected with a granulating nozzle inside a granulating tower.
Furthermore, the ammonia stripping tower is arranged at the inner upper part of the granulation tower, the lower part of the ammonia stripping tower is provided with a granulation nozzle, and a partition plate is arranged between the ammonia stripping tower and the granulation nozzle.
The utility model has the advantages of structural design is simple reasonable, production and equipment investment are low, reduce under the prerequisite of 30mg/m heavy rows and carry out effective recovery to ammonia in making urea prilling tower tail gas.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
FIG. 2 is a schematic view of the ammonia stripping column of the present invention.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described with reference to the accompanying drawings, in which like reference numerals refer to like parts in the drawings. For the sake of simplicity, only the parts related to the utility model are schematically shown in the drawings, and they do not represent the actual structure as a product.
As shown in fig. 1 and 2, the utility model relates to an ammonia stripping tower and a urea production device using the same, the ammonia stripping tower comprises an ammonia stripping tower body 6, a gas outlet pipeline 18 is arranged at the top of the ammonia stripping tower body 6, a molten urea outlet pipeline 19 is arranged at the bottom of the ammonia stripping tower body 6, a liquid distribution plate 12 is arranged at the upper inner part of the ammonia stripping tower body 6, a baffle plate 14 is arranged at the lower part of the liquid distribution plate 12, a gas distribution plate 11 is arranged at the lower inner part of the ammonia stripping tower body 6, a plurality of liquid distributors 9 with upper and lower ends open are arranged between the liquid distribution plate 12 and the gas distribution plate 11, distribution holes 10 are arranged on the outer wall of the liquid distributor 9 between the liquid distribution plate 12 and the baffle plate 14, a molten urea inlet pipeline 22 is arranged on the ammonia stripping tower body 6 between the liquid distribution plate 12 and the baffle plate 14, a low-pressure steam inlet pipeline 15 is arranged on the ammonia stripping tower body 6 between the baffle plate 14 and the gas distribution plate, a condensate outlet pipeline 16 is arranged at the lower part of one side of the ammonia stripping tower body 6 between the baffle plate 14 and the gas distribution plate 11; the ammonia stripping tower body 6 at the lower part of the gas distribution plate 11 is provided with a carbon dioxide gas pipeline 17.
Preferably, said gas outlet conduit 18 is connected to the low pressure recovery device 7 of the urea main unit through a valve 8.
Preferably, the distribution holes 10 are opened in the outer wall of the liquid distributor 9 near one end of the baffle 14.
Preferably, the outer wall of the liquid distributor 9 is provided with a plurality of distribution holes 10.
Preferably, the low-pressure steam inlet pipe 15 is arranged at the upper part of the other side of the ammonia stripping tower body 6, and the low-pressure steam inlet pipe 15 is connected with the low-pressure steam pipe network 3.
Preferably, the condensate outlet conduit 16 is connected to a condensate storage tank 20.
Preferably, the liquid distribution plate 12 and the gas distribution plate 11 are respectively provided with air holes at positions corresponding to the openings at the upper and lower ends of the liquid distributor 9, the outlet of the carbon dioxide gas pipeline 17 is arranged at a position corresponding to the lower part of the air hole of the gas distribution plate 11, and the inlet of the carbon dioxide gas pipeline 17 is connected with the carbon dioxide pipe network 5.
The utility model provides a urea apparatus for producing, includes urea two-stage evaporation separator 1, and urea two-stage evaporation separator 1 links to each other with the molten urea inlet pipe way 22 of ammonia stripping tower through the melting pump 2, and the molten urea outlet pipe way 19 of ammonia stripping tower links to each other with the inside granulation shower nozzle 4 of prilling tower 13.
Preferably, the ammonia stripping tower is arranged at the inner upper part of the prilling tower 13, the prilling nozzle 4 is arranged at the lower part of the ammonia stripping tower, and a partition 21 is arranged between the ammonia stripping tower and the prilling nozzle 4.
If study granulation tail gas under the normal conditions simply, because tolerance is bigger in the tail gas, and has the lower condition of ammonia partial pressure to the tail gas at granulation tower top, the scheme that utilizes the ammonia of direct in to the tail gas to carry out the recovery is difficult to realize, consequently the utility model discloses a source urine through producing free ammonia in the urea tail gas is controlled. The method is mainly realized by arranging an ammonia stripping tower between a urea melting pump 2 and a granulation spray nozzle 4, wherein a molten urea solution with the concentration of more than 99.5 percent from the melting pump 2 directly enters the stripping tower, the molten urea solution in the stripping tower enters a liquid distributor 9, flows downwards in a film shape through the inner wall of the liquid distributor 9, is heated by saturated low-pressure steam at the shell side in the descending process and is in countercurrent gas phase contact with carbon dioxide from a carbon dioxide gas pipeline 17, free ammonia in the molten urea solution is desorbed into a gas phase by heating and gas action, and finally is sent to a low-pressure recovery device 7 of a urea main device for recycling through a gas outlet pipeline 18. Since the free ammonia in the molten urea solution is effectively removed in the process, effective control of the ammonia in the prilling tower tail gas can be achieved.
The utility model discloses a theory of operation does: molten urea solution with the concentration of more than 99.5 percent from a urea two-stage evaporation separator 1 is conveyed between a liquid distribution plate 12 and a baffle 14 of an ammonia stripping tower through a melting pump 2, a plurality of liquid distributors 9 are arranged in the ammonia stripping tower, distribution holes 10 are arranged on a pipe section of the liquid distributor 9 between the liquid distribution plate 12 and the baffle 14, the molten urea solution entering between the liquid distribution plate 12 and the baffle 14 enters the liquid distributor 9 through the distribution holes 10 and flows downwards along the inner pipe wall of the liquid distributor 9 in a film shape, and exchanges heat with low-pressure saturated steam from a low-pressure steam pipe network 3 in the descending process, carbon dioxide gas in the carbon dioxide pipe network 5 enters the liquid distributors 9 under the action of a gas distribution plate 11 during the heat exchange, free ammonia volatilized after being heated in the molten urea solution enters a gas outlet pipeline 18 through the liquid distribution plate 12 under the action of the carbon dioxide, the urea solution is conveyed to a low-pressure recovery device 7 of the urea main device through a gas outlet pipeline 18 for recycling, and the pure molten urea solution enters a granulation nozzle 4 through a molten urea outlet pipeline 19 for granulation; it should be noted that, the valve 8 is installed on the gas outlet pipeline 18 at the top of the stripping tower, and the valve is used for preheating the system and the pipeline before the urea device is granulated, so as to prevent the steam from directly approaching the low-pressure recovery device 7 of the urea main device through the top of the ammonia stripping tower, and therefore, when the pipeline is preheated, the valve 8 needs to be closed, and after granulation, the valve 8 is opened to ensure the normal operation of the equipment.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected," "connecting," and the like are to be construed broadly, and may be, for example, fixedly connected, integrally connected, or detachably connected; or communication between the interior of the two elements; they may be directly connected or indirectly connected through an intermediate, and those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific situation. The above examples are only specific illustrations of feasible embodiments of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent embodiments, modifications and alterations without departing from the technical spirit of the present invention are intended to be included in the scope of the present invention.
Claims (9)
1. An ammonia stripping column, characterized by: ammonia stripping tower include ammonia stripping tower body (6), the top of ammonia stripping tower body (6) is equipped with gas outlet pipeline (18), the bottom of ammonia stripping tower body (6) is equipped with molten urea outlet pipeline (19), the interior upper portion of ammonia stripping tower body is equipped with liquid distribution board (12), the lower part of liquid distribution board (12) is equipped with baffle (14), the interior lower part of ammonia stripping tower body (6) is equipped with gas distribution board (11), be equipped with about a plurality of open-ended liquid distributor (9) between liquid distribution board (12) and gas distribution board (11), seted up on liquid distributor (9) outer wall between liquid distribution board (12) and baffle (14) distribution hole (10), be equipped with molten urea inlet pipeline (22) on ammonia stripping tower body (6) between liquid distribution board (12) and baffle (14), be equipped with low pressure steam inlet pipe (6) on ammonia stripping tower body (6) between baffle (14) and gas distribution board (11) A condensate outlet pipeline (16) is arranged at the lower part of one side of the ammonia stripping tower body (6) between the baffle (14) and the gas distribution plate (11) of the channel (15); a carbon dioxide gas pipeline (17) is arranged on the ammonia stripping tower body (6) at the lower part of the gas distribution plate (11).
2. An ammonia stripper as defined in claim 1 wherein: the gas outlet pipe (18) is connected with a low-pressure recovery device (7) of the urea main device through a valve (8).
3. An ammonia stripper as defined in claim 1 wherein: the distribution holes (10) are formed in the outer wall of the liquid distributor (9) close to one end of the baffle plate (14).
4. An ammonia stripper as defined in claim 1 wherein: the outer wall of the liquid distributor (9) is provided with a plurality of distribution holes (10).
5. An ammonia stripper as defined in claim 1 wherein: the low-pressure steam inlet pipeline (15) is arranged on the upper part of the other side of the ammonia stripping tower body (6), and the low-pressure steam inlet pipeline (15) is connected with the low-pressure steam pipe network (3).
6. An ammonia stripper as defined in claim 1 wherein: the condensate outlet pipe (16) is connected with a condensate storage tank (20).
7. An ammonia stripper as defined in claim 1 wherein: the liquid distribution plate (12) and the gas distribution plate (11) are respectively provided with air holes at the positions corresponding to the openings at the upper end and the lower end of the liquid distributor (9), the outlet of a carbon dioxide gas pipeline (17) is arranged at the position corresponding to the lower part of the air hole of the gas distribution plate (11), and the inlet of the carbon dioxide gas pipeline (17) is connected with a carbon dioxide pipe network (5).
8. A urea production device is characterized in that: comprising a urea two-stage evaporator-separator (1), the urea two-stage evaporator-separator (1) being connected by means of a melt pump (2) to a urea melt inlet line (22) of an ammonia stripper according to any of the preceding claims 1-7, the urea melt outlet line (19) of the ammonia stripper being connected to a prilling spray head (4) inside a prilling tower (13).
9. A plant for urea production according to claim 8, characterized in that: the ammonia stripping tower is arranged at the inner upper part of the prilling tower (13), the lower part of the ammonia stripping tower is provided with a prilling spray nozzle (4), and a partition plate (21) is arranged between the ammonia stripping tower and the prilling spray nozzle (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921214310.8U CN210521816U (en) | 2019-07-30 | 2019-07-30 | Ammonia stripping tower and use its urea apparatus for producing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921214310.8U CN210521816U (en) | 2019-07-30 | 2019-07-30 | Ammonia stripping tower and use its urea apparatus for producing |
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| Publication Number | Publication Date |
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| CN210521816U true CN210521816U (en) | 2020-05-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921214310.8U Active CN210521816U (en) | 2019-07-30 | 2019-07-30 | Ammonia stripping tower and use its urea apparatus for producing |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110270122A (en) * | 2019-07-30 | 2019-09-24 | 河南心连心化学工业集团股份有限公司 | A kind of aminoacid stripping tower and remove the method for gas ammonia and the urea plant using it |
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2019
- 2019-07-30 CN CN201921214310.8U patent/CN210521816U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110270122A (en) * | 2019-07-30 | 2019-09-24 | 河南心连心化学工业集团股份有限公司 | A kind of aminoacid stripping tower and remove the method for gas ammonia and the urea plant using it |
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