CN217568668U - Urea catalytic hydrolysis ammonia production system - Google Patents
Urea catalytic hydrolysis ammonia production system Download PDFInfo
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- CN217568668U CN217568668U CN202220469993.7U CN202220469993U CN217568668U CN 217568668 U CN217568668 U CN 217568668U CN 202220469993 U CN202220469993 U CN 202220469993U CN 217568668 U CN217568668 U CN 217568668U
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Abstract
The utility model discloses a urea catalysis hydrolysis ammonia production system belongs to flue gas denitration technical field, has solved among the prior art heat exchange efficiency low, arrange the sediment untimely, the problem that the precision is low, including the hydrolysis reactor, urea solution storage tank bottom is connected with the hydrolysis reactor through force pump A, and the catalyst solution jar is connected with the hydrolysis reactor through force pump B, and the ammonia outlet of hydrolysis reactor is connected with the empty blender of ammonia through metering module, and the outlet of hydrolysis reactor waste liquid is connected with the waste liquid case after the oblique flow pipe overflow, is equipped with three-dimensional heat transfer tube bank in the hydrolysis reactor. The utility model discloses a three-dimensional heat transfer tube bank, bellying and depressed part combine and increase heat transfer area to improve heat exchange efficiency, wholly become smooth curved surface form simultaneously, effectively avoided impurity in the urea solution at heat exchange tube surface scale deposit, impurity in the mode through the overflow in time discharges hydrolysis reactor, avoids the impurity to pollute the heat exchange tube, utilizes ammonia mass flow meter real-time supervision ammonia production volume, improves product quality.
Description
Technical Field
The utility model belongs to the technical field of the flue gas denitration, specifically speaking especially relates to a urea catalysis hydrolysis system ammonia system.
Background
The SCR technical principle of the coal-fired power plant is that ammonia is used as a reducing agent to perform catalytic reduction reaction with nitrogen oxide at the temperature of 300-400 ℃ to generate nitrogen and water which are nontoxic and harmless to the environment, so that the preparation of ammonia becomes an important link in SCR denitration, and the preparation method of ammonia becomes a key research content in the field. The preparation method of ammonia mainly comprises a liquid ammonia method, an ammonia water method and a urea method, wherein the liquid ammonia is combustible and toxic and is easy to explode, and can form a major hazard source when used for more than 40 t; the ammonia method needs to evaporate a large amount of water, has high energy consumption and the highest storage and transportation cost, and the service life of the catalyst can be shortened by heavy metal ions in the ammonia; the urea is a stable and nontoxic solid particle, does not need special requirements for transportation and storage, and is an ideal method for preparing ammonia, so that the urea decomposition ammonia preparation process is increasingly applied to flue gas denitration engineering. The conventional heat exchange tube bundle is mostly adopted in the existing urea catalytic hydrolysis ammonia production system, the surface is easy to scale, the heat exchange efficiency is reduced, meanwhile, the conventional flow meter is mostly adopted to monitor the ammonia gas outlet amount, the ammonia gas reaction amount cannot be accurately controlled, and the denitration efficiency is greatly reduced.
Disclosure of Invention
The utility model aims at providing a urea catalysis hydrolysis ammonia production system that heat exchange efficiency is high, arrange sediment in time, the precision is high not enough to prior art exists.
In order to realize the technical purpose, the utility model discloses the technical scheme that urea catalysis hydrolysis ammonia production system adopted does:
the utility model provides a urea catalytic hydrolysis ammonia production system, includes urea solution storage tank, catalyst solution jar, hydrolysis reactor and ammonia empty blender, urea solution storage tank top is equipped with the urea spray tube bank that is connected with the air pump, and the bottom is connected with the hydrolysis reactor through force pump A, the catalyst solution jar is connected with the hydrolysis reactor through force pump B, the ammonia outlet of hydrolysis reactor is connected with ammonia empty blender through metering module, ammonia empty blender cold wind end is connected with flue gas air heater, the outlet of hydrolysis reactor waste liquid is connected with the waste liquid case after the oblique flow pipe overflow, be equipped with the three-dimensional heat exchange tube bank that the disc distributes in the hydrolysis reactor, the heat exchange tube bank is buckled into the U-shaped by many heat exchange tubes and is evenly arranged, the heat exchange tube includes straight tube section and bending segment, the straight tube section is connected in proper order by bellying and depressed part and is formed smooth curved surface, the interface that smooth curved surface and urea solution contacted in the hydrolysis reactor is the ripple type curved surface.
Preferably, the upper end in the urea solution storage tank is provided with a stirrer extending into the liquid, and a steam coil is arranged below the stirrer.
Preferably, the metering module comprises an ammonia gas delivery pipe connected with an ammonia gas outlet, and an ammonia gas regulating valve and an ammonia gas mass flowmeter are sequentially arranged on the ammonia gas delivery pipe.
Preferably, the hydrolysis reactor comprises a cylinder and end sockets arranged at two ends of the cylinder, and flanges connected with the heat exchange tube bundle are arranged on the end sockets.
Preferably, the opening part of the heat exchange tube bundle is positioned outside the cylinder, and the closing part is positioned inside the cylinder.
Preferably, the distance between the top points of the adjacent convex parts is 5-10 cm, and the distance between the bottom points of the adjacent concave parts is 5-10 cm.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model adopts the three-dimensional heat exchange tube bundle, the convex part and the concave part are combined to increase the heat exchange area, thereby improving the heat exchange efficiency, and simultaneously, the whole body is in a smooth curved surface shape, effectively avoiding the impurities in the urea solution from scaling on the surface of the heat exchange tube, and reducing the cleaning and maintenance cost; impurities in the hydrolysis reactor are discharged in time in an overflow mode, so that the impurities are prevented from polluting the heat exchange tube; the production of ammonia gas is monitored in real time by using an ammonia gas mass flowmeter, the ammonia content is accurately controlled according to the process requirements, and the product quality is improved.
Drawings
Fig. 1 is a schematic view of the present invention;
FIG. 2 is a schematic view of the structure of the hydrolysis reactor of the present invention;
fig. 3 is a schematic structural diagram of the heat exchange tube of the present invention.
In the figure: 1. a urea solution storage tank; 2. a catalyst solution tank; 3. a hydrolysis reactor; 4. an ammonia-air mixer; 5. an air pump; 6. a urea spray pipe; 7. a pressure pump A;8. a pressure pump B;9. a flue gas air heater; 10. an oblique flow pipe; 11. a waste liquid tank; 12. a boss portion; 13. a recessed portion; 14. a stirrer; 15. a steam coil; 16. an ammonia gas delivery pipe; 17. an ammonia gas regulating valve; 18. an ammonia mass flow meter;
301. a barrel; 302. sealing the end; 303. a flange.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1-3, a urea catalytic hydrolysis ammonia production system, including urea solution storage tank 1, catalyst solution jar 2, hydrolysis reactor 3 and ammonia air mixer 4, 1 top of urea solution storage tank is equipped with the urea spray tube bank 6 that is connected with air pump 5, and the bottom is connected with hydrolysis reactor 3 through force pump A7, catalyst solution jar 2 is connected with hydrolysis reactor 3 through force pump B8, 3 ammonia outlet of hydrolysis reactor is connected with ammonia air mixer 4 through metering module, 4 cold wind ends of ammonia air mixer are connected with flue gas fan heater 9, 3 waste liquid outlet of hydrolysis reactor is connected with waste liquid case 11 after the overflow of oblique flow tube 10, be equipped with the three-dimensional heat transfer tube bank of discoid distribution in the hydrolysis reactor 3, heat transfer tube bank is bent into the U-shaped by many heat exchange tubes and evenly arranges, the heat exchange tube includes straight tube section and bending section, the straight tube section is connected in proper order by bellying 12 and depressed part 13 and is formed smooth curved surface, the interface that smooth curved surface and urea solution contact in the hydrolysis reactor 3 is the ripple type curved surface. Wherein, smooth curved surface forms glossy ripple curved surface after with the solution contact, increases heat exchange tube bank's heat exchange efficiency on the one hand, and on the other hand is because the disturbance makes the gas escape in the solution, further promotes the hydrolysis of urea, and simultaneously through the disturbance to urea solution, impurity is attached to the heat exchange tube surface in avoiding the solution, and then the problem of scale deposit.
The upper end of the interior of the urea solution storage tank 1 is provided with a stirrer 14 extending into the liquid, and a steam coil 15 is arranged below the stirrer 14.
The metering module comprises an ammonia gas delivery pipe 16 connected with an ammonia gas outlet, and an ammonia gas regulating valve 17 and an ammonia gas mass flowmeter 18 are sequentially arranged on the ammonia gas delivery pipe 16.
The hydrolysis reactor 3 comprises a cylinder 301 and end enclosures 302 arranged at two ends of the cylinder 301, wherein flanges 303 connected with the heat exchange tube bundle are arranged on the end enclosures 302. The flange 303 is used for connecting the heat exchange tube bundle, so that the heat exchange tube bundle is convenient to disassemble and clean.
The opening part of the heat exchange tube bundle is positioned outside the cylinder body 301, and the closed part is positioned inside the cylinder body 302.
The distance between the top points of the adjacent convex parts 12 is 5-10 cm, and the distance between the bottom points of the adjacent concave parts 13 is 5-10 cm.
Solid urea is pumped into a urea solution dissolving storage tank by an air pump and a urea spraying pipe bundle, the urea solution is stirred and dissolved in the solution by a stirrer, steam is heated by a steam coil pipe, the urea and water are dissolved in the dissolving tank to prepare a urea solution with the mass concentration of 30-60%, a urea solution is pumped into a hydrolysis reactor by a pressure pump A, a catalyst solution is conveyed into the hydrolysis reactor by a pressure pump B, the urea solution is conveyed into the hydrolysis reactor, the urea is subjected to hydrolysis reaction at a certain temperature and pressure to generate ammonia gas, carbon dioxide and water vapor, the ammonia gas, the carbon dioxide and the water vapor are mixed in an ammonia-air mixer, a flue gas heater heats cold air to form hot air, the ammonia gas and the hot air are fully mixed in the mixer and then are conveyed to an ammonia spraying grid for denitration reaction, and pollutants such as side reaction products or impurities in the urea solution overflow into a waste liquid tank through an inclined pipe after long-time operation.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (6)
1. The utility model provides a urea catalytic hydrolysis system ammonia system, includes urea solution storage tank, catalyst solution jar, hydrolysis reactor and empty blender of ammonia which characterized in that: urea solution storage tank top is equipped with the urea that is connected with the air pump and sprays the tube bank, and the bottom is connected with the hydrolysis reactor through force pump A, the catalyst solution jar is connected with the hydrolysis reactor through force pump B, the hydrolysis reactor ammonia export is connected with the ammonia air mixer through metering module, ammonia air mixer cold wind end is connected with flue gas fan heater, the hydrolysis reactor waste liquid export is connected with the waste liquid case after the pipe chute overflow, be equipped with the three-dimensional heat exchanger tube bank that the disc distributes in the hydrolysis reactor, the heat exchanger tube bank is buckled into the U-shaped by many heat exchange tubes and evenly arranges, the heat exchange tube includes straight tube section and bending segment, the straight tube section is connected in proper order by bellying and depressed part and forms smooth curved surface, the interface that urea solution contacted in smooth curved surface and the hydrolysis reactor is ripple type curved surface.
2. The system for producing ammonia by catalytic hydrolysis of urea according to claim 1, wherein: the upper end in the urea solution storage tank is provided with a stirrer extending into the liquid, and a steam coil is arranged below the stirrer.
3. The system for producing ammonia by catalytic hydrolysis of urea according to claim 1, wherein: the metering module comprises an ammonia delivery pipe connected with an ammonia outlet, and an ammonia regulating valve and an ammonia mass flow meter are sequentially arranged on the ammonia delivery pipe.
4. The system for producing ammonia by catalytic hydrolysis of urea according to claim 1, wherein: the hydrolysis reactor comprises a cylinder body and end sockets arranged at two ends of the cylinder body, and flanges connected with the heat exchange tube bundle are arranged on the end sockets.
5. The system for producing ammonia by catalytic hydrolysis of urea according to claim 4, wherein: the opening part of the heat exchange tube bundle is positioned outside the cylinder body, and the closing part is positioned inside the cylinder body.
6. The system for producing ammonia by catalytic hydrolysis of urea according to claim 1, wherein: the distance between the top points of the adjacent convex parts is 5-10 cm, and the distance between the bottom points of the adjacent concave parts is 5-10 cm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220469993.7U CN217568668U (en) | 2022-03-01 | 2022-03-01 | Urea catalytic hydrolysis ammonia production system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220469993.7U CN217568668U (en) | 2022-03-01 | 2022-03-01 | Urea catalytic hydrolysis ammonia production system |
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| CN217568668U true CN217568668U (en) | 2022-10-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116002716A (en) * | 2022-12-28 | 2023-04-25 | 华能沁北发电有限责任公司 | Zero-waste emission system and method for thermal power plant urea hydrothermal ammonia production |
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- 2022-03-01 CN CN202220469993.7U patent/CN217568668U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116002716A (en) * | 2022-12-28 | 2023-04-25 | 华能沁北发电有限责任公司 | Zero-waste emission system and method for thermal power plant urea hydrothermal ammonia production |
| CN116002716B (en) * | 2022-12-28 | 2024-05-28 | 华能沁北发电有限责任公司 | Zero-waste emission system and method for thermal power plant urea hydrothermal ammonia production |
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