CN217287837U - Device for reducing ammonia emission in urea process - Google Patents
Device for reducing ammonia emission in urea process Download PDFInfo
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- CN217287837U CN217287837U CN202221118643.2U CN202221118643U CN217287837U CN 217287837 U CN217287837 U CN 217287837U CN 202221118643 U CN202221118643 U CN 202221118643U CN 217287837 U CN217287837 U CN 217287837U
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Abstract
The utility model discloses a device for reducing ammonia discharge in urea process, which comprises a normal pressure absorption tower; the condensed water spraying structure comprises a plate heat exchanger, a flow regulating device and a spray head B; the circulating spraying structure comprises a spray head A and a circulating pump; analyzing a hydrolysis system; an ammonia tank; the top of the normal pressure absorption tower is connected with an emptying cylinder through a pipeline; the spray head A and the spray head B are arranged in the normal pressure absorption tower; the spray head A is connected with the bottom of the normal pressure absorption tower through a pipeline; the spray head B is connected with the plate heat exchanger through a pipeline, and a flow regulating device is arranged on the pipeline; the normal pressure absorption tower is connected with the first-stage evaporative condenser and the second-stage evaporative condenser through pipelines; the normal pressure absorption tower is connected with an ammonia water tank, and the ammonia water tank is connected with the analytic hydrolysis system through a delivery pump. The device is provided with three spray headers and related structures, so that the absorption effect on ammonia gas is improved; effectively reduces the ammonia content of the emptying cylinder, reduces the ammonia loss and solves the problem that the tail gas does not reach the standard.
Description
Technical Field
The utility model relates to a urea production technical field, concretely relates to reduce device of ammonia emission in urea technology.
Background
The ammonia water of the prior urea production device has high ammonia and carbon dioxide concentration, heavy load of desorption hydrolysis, and frequent crystallization of a low-pressure methylamine condenser and a reflux condenser in the running process of the device. The reflux condenser is crystallized, the absorption effect is poor, the ammonia and carbon dioxide content in tail gas is high, absorption liquid needs to be added, the amount of water entering a system is increased due to the increase of the absorption liquid, the water-carbon ratio of the system is high, the conversion rate is poor, the ammonia consumption of the whole device is high, the steam consumption is high, the load of the normal-pressure absorption tower is excessive, the vacuum degree of the first section and the second section of evaporation is influenced, the water fluctuation of a product is caused, evaporation vacuumizing noncondensable gas is forced to be led into an emptying cylinder, the air emptying amount of the emptying cylinder is increased, the washing effect is poor, the system load is excessive, the overall conversion rate is low, the ammonia content in the gas phase of an ammonia water tank and a urine tank is high, and the ammonia content in the tail gas of the emptying cylinder is high and low.
SUMMERY OF THE UTILITY MODEL
To the problem among the prior art, the utility model provides a reduce device of ammonia emission in urea technology to ammonia height in the tail gas of solution emptying section of thick bamboo, the ordinary pressure absorption tower overload, the undulant problem of product moisture.
For realizing the purpose of the utility model, the utility model adopts the following technical scheme:
a device for reducing ammonia discharge in urea process comprises a normal pressure absorption tower; the condensed water spraying structure comprises a plate heat exchanger, a flow regulating device and a spray head B; the circulating spraying structure comprises a spray head A and a circulating pump; analyzing a hydrolysis system; an ammonia water tank; the top of the normal pressure absorption tower is connected with an emptying cylinder through a pipeline; the spray head A and the spray head B are arranged in the normal pressure absorption tower; the spray head A is connected with the bottom of the normal pressure absorption tower through a pipeline, and a circulating pump is arranged on the pipeline; the spray head B is connected with a plate heat exchanger in a steam condensate system through a pipeline, and a flow regulating device is arranged on the pipeline; the normal pressure absorption tower is connected with a first-stage evaporative condenser and a second-stage evaporative condenser in the evaporation system through pipelines; the normal pressure absorption tower is connected with an ammonia water tank, and the ammonia water tank is connected with the analytic hydrolysis system through a delivery pump.
Preferably, the flow regulating device comprises a standby valve, a flow transmitter, a stop valve A, a flow regulating valve, a stop valve B and a controller; the flow transmitter is arranged at the front end of the stop valve A, the stop valve A is arranged at the front end of the flow regulating valve, and the flow regulating valve is arranged at the front end of the stop valve B; one end of the standby valve is connected with the flow transmitter and the stop valve A, and the other end of the standby valve is connected with the rear end of the stop valve B; and the controller is respectively electrically connected with the flow transmitter and the flow regulating valve.
Preferably, a spray head C is further arranged in the normal pressure absorption tower, and the spray head C is connected with a low pressure absorption tower in the urea production process through a pipeline.
Preferably, the spray head B is higher than the spray head C; and the spray head C is higher than the spray head A.
Preferably, the atmospheric absorption tower is connected with the ammonia water tank through an overflow pipe.
Preferably, the atmospheric absorption tower is connected with a gas phase pipeline of the desorption hydrolysis system.
Compared with the prior art, the utility model, following beneficial effect has:
the device is provided with three spray headers and related structures, so that the ammonia concentration of spray liquid in the absorption tower is gradually reduced from low to high, and the absorption effect on ammonia gas is improved; effectively reduces the ammonia content of the emptying cylinder and the ammonia loss.
The device is provided with the condensed water spraying device, the flow rate of the condensed water can be controlled according to the ammonia concentration in the emptying cylinder and the ammonia tank, the water consumption is saved, and the problem of overweight load of the desorption hydrolysis system is avoided while the ammonia discharge capacity is ensured to reach the standard;
set up the circulating pump in the device and circulate the aqueous ammonia at the bottom of the atmospheric absorption tower to shower nozzle A again, further to the ammonia absorption in the atmospheric absorption tower, practiced thrift the water consumption.
Drawings
FIG. 1 is a schematic diagram of the structural connection of an apparatus for reducing ammonia emissions in a urea process according to the present invention;
FIG. 2 is a schematic diagram showing the connection of a flow regulating device of an ammonia emission reducing apparatus in a urea process according to the present invention;
in the figure: 1. the device comprises a normal pressure absorption tower, 2, an emptying barrel, 3, a plate heat exchanger, 4, an analytic hydrolysis system, 5, an ammonia water tank, 6, a circulating pump, 7, a section of evaporative condenser, 8, a section of evaporative condenser, 9, a spray head A, 10, a flow regulating device, 11, a low pressure absorption tower, 12, a spray head B, 13, a spray head C, 14, a delivery pump, 101, a standby valve, 102, a flow transmitter, 103, a stop valve A103, 104, a flow regulating valve, a stop valve B105 and a controller 106.
Detailed Description
The drawings in the embodiments of the present invention will be combined; the technical scheme in the embodiment of the utility model is clearly and completely described:
as shown in fig. 1, in one embodiment of the present invention, an apparatus for reducing ammonia emissions in a urea process comprises an atmospheric absorption tower 1; the condensed water spraying structure comprises a plate heat exchanger 3, a flow regulating device 10 and a spray head B12; the circulating spraying structure comprises a spray head A9 and a circulating pump 6; analyzing the hydrolysis system 4; an ammonia tank 5; the top of the normal pressure absorption tower 1 is connected with an emptying cylinder 2 through a pipeline; the spray head A9 and the spray head B12 are arranged in the atmospheric absorption tower 1; the spray head A9 is connected with the bottom of the normal pressure absorption tower 1 through a pipeline, and a circulating pump 6 is arranged on the pipeline; the spray head B12 is connected with the plate heat exchanger 3 in a steam condensate system (used in the urea production process) through a pipeline, the pipeline is provided with a flow regulating device 10, and an operator can control the flow according to the ammonia concentration in the emptying cylinder 2 and the ammonia water tank 5, so that the problem of overload of the analysis hydrolysis system 5 is avoided while the standard of the ammonia discharge is ensured; the normal pressure absorption tower 1 is connected with a first-stage evaporative condenser 7 and a second-stage evaporative condenser 8 in an evaporation system (an evaporation system used in the urea production process) through pipelines; absorbing ammonia in the gas phase of the evaporation system; the normal pressure absorption tower 1 is connected with an ammonia water tank 5, and the ammonia water tank 5 is connected with an analytic hydrolysis system 4 through a delivery pump 14; and (4) converting and recovering ammonia.
As shown in fig. 2, in an embodiment of the present invention, the flow regulating device 10 includes a backup valve 101, a flow transmitter 102, a stop valve a103, a flow regulating valve 104, a stop valve B105, and a controller 106; the flow transmitter 102 is arranged at the front end of a stop valve A103, the stop valve A103 is arranged at the front end of a flow regulating valve 104, and the flow regulating valve 104 is arranged at the front end of a stop valve B105; one end of a standby valve 101 is connected with the flow transmitter 102 and the stop valve A103, and the other end of the standby valve 101 is connected with the rear end of the stop valve B105; the controller 106 is electrically connected to the flow transmitter 102 and the flow control valve 104, respectively, to facilitate replacement and maintenance of the flow control valve 104.
The utility model discloses a concrete embodiment, still be equipped with shower nozzle C13 in the ordinary pressure absorption tower 1, shower nozzle C13 passes through the pipe connection with the low pressure absorption tower 11 in the urea production technology, introduces ordinary pressure absorption tower 1 with the lower aqueous ammonia of concentration in the low pressure absorption tower 11, continues to absorb the ammonia, reduces the consumption of comdenstion water.
In a specific embodiment of the present invention, the spray head B12 is higher than the spray head C13; the spray head C13 is higher than the spray head A9; the ammonia concentration of the spray liquid is gradually reduced from low to high, and the absorption effect on ammonia gas is improved.
In one embodiment of the present invention, the atmospheric absorption tower 1 is connected to the ammonia water tank through an overflow pipe.
In a specific embodiment of the present invention, the atmospheric absorption tower 1 is connected to a gas phase pipeline of the desorption hydrolysis system 4; so that the gas in the desorption hydrolysis system 4 flows back to the atmospheric absorption tower 1 for further absorption.
During specific operation, gas phases in the first-stage evaporative condenser 7, the second-stage evaporative condenser 8 and the desorption hydrolysis system 4 are introduced into the normal pressure absorption tower 1, ammonia water with lower concentration from the low pressure absorption tower 11 is sprayed and absorbed, then the ammonia water at the bottom of the normal pressure absorption tower 1 is circulated to the spray head A9 again through the circulating pump 6, and ammonia gas in the normal pressure absorption tower 1 is further absorbed; ammonia water at the bottom of the normal pressure absorption tower 1 enters an ammonia water tank 5 through an overflow pipe, and then the ammonia water gathered in the ammonia water tank 5 enters an analytic hydrolysis system 4 through a delivery pump 14 to be converted and recovered; in the absorption process, an operator can set the flow through the controller 106 according to the ammonia concentration in the emptying cylinder 2 and the ammonia water tank 5, so that the ammonia discharge amount is ensured to reach the standard, the ammonia content in the ammonia water tank 5 is controlled to be lower (about 4 percent), and the problem of heavy load of the analysis hydrolysis system 5 is avoided; when the flow control valve 104 needs to be repaired or replaced, the stop valves a103 and B105 are closed, the backup valve 101 is opened, the backup valve 101 is closed after the work is completed, and the stop valves a103 and B105 are opened.
The above description is only for the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution and the improvement concept of the present invention within the technical scope disclosed in the present invention, and all the technical solutions and the improvement concepts should be covered by the protection scope of the present invention.
Claims (6)
1. A device for reducing ammonia discharge in urea process comprises a normal pressure absorption tower; the method is characterized in that: further comprising:
the condensed water spraying structure comprises a plate heat exchanger, a flow regulating device and a spray head B;
the circulating spraying structure comprises a spray head A and a circulating pump; analyzing a hydrolysis system; an ammonia tank;
wherein the top of the normal pressure absorption tower is connected with an emptying cylinder through a pipeline; the spray head A and the spray head B are arranged in the normal pressure absorption tower; the spray head A is connected with the bottom of the normal pressure absorption tower through a pipeline, and a circulating pump is arranged on the pipeline; the spray head B is connected with a plate heat exchanger in a steam condensate system through a pipeline, and a flow regulating device is arranged on the pipeline; the normal pressure absorption tower is connected with a first-stage evaporative condenser and a second-stage evaporative condenser in the evaporation system through pipelines; the normal pressure absorption tower is connected with an ammonia water tank, and the ammonia water tank is connected with an analytic hydrolysis system through a delivery pump.
2. An apparatus for reducing ammonia emissions in a urea process as claimed in claim 1, wherein: the flow regulating device comprises a standby valve, a flow transmitter, a stop valve A, a flow regulating valve, a stop valve B and a controller; the flow transmitter is arranged at the front end of the stop valve A, the stop valve A is arranged at the front end of the flow regulating valve, and the flow regulating valve is arranged at the front end of the stop valve B; one end of the standby valve is connected with the flow transmitter and the stop valve A, and the other end of the standby valve is connected with the rear end of the stop valve B; and the controller is respectively electrically connected with the flow transmitter and the flow regulating valve.
3. An apparatus for reducing ammonia emissions in a urea process as claimed in claim 1, wherein: and a spray head C is also arranged in the normal pressure absorption tower and is connected with a low pressure absorption tower in the urea production process through a pipeline.
4. An apparatus for reducing ammonia emissions in a urea process according to claim 3, wherein: the spray head B is higher than the spray head C; and the spray head C is higher than the spray head A.
5. An apparatus for reducing ammonia emissions in a urea process according to claim 1, wherein: the normal pressure absorption tower is connected with the ammonia water tank through an overflow pipe.
6. An apparatus for reducing ammonia emissions in a urea process according to claim 1, wherein: and the normal pressure absorption tower is connected with a gas phase pipeline of the analytic hydrolysis system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221118643.2U CN217287837U (en) | 2022-05-10 | 2022-05-10 | Device for reducing ammonia emission in urea process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221118643.2U CN217287837U (en) | 2022-05-10 | 2022-05-10 | Device for reducing ammonia emission in urea process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217287837U true CN217287837U (en) | 2022-08-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221118643.2U Active CN217287837U (en) | 2022-05-10 | 2022-05-10 | Device for reducing ammonia emission in urea process |
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| Country | Link |
|---|---|
| CN (1) | CN217287837U (en) |
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2022
- 2022-05-10 CN CN202221118643.2U patent/CN217287837U/en active Active
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