CN217910444U - Urea desorption system of hydrolysising - Google Patents
Urea desorption system of hydrolysising Download PDFInfo
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- CN217910444U CN217910444U CN202222200732.8U CN202222200732U CN217910444U CN 217910444 U CN217910444 U CN 217910444U CN 202222200732 U CN202222200732 U CN 202222200732U CN 217910444 U CN217910444 U CN 217910444U
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Abstract
The utility model relates to a urea desorption hydrolysis field, in particular to a urea desorption hydrolysis system, which comprises a desorption tower, a hydrolysis pump and a hydrolysis heat exchanger, wherein the hydrolysis pump and the hydrolysis heat exchanger are sequentially connected between the upper section lower part of the desorption tower and the upper part of the hydrolysis tower through pipelines; the lower part of the upper section of the desorption tower is connected in parallel to a cooler through a pipeline, and a liquid outlet of the cooler is connected to a liquid inlet pipe of the granulated dust washer through a centrifugal pump. The utility model discloses in sending the liquid in the desorber to granulation dust scrubber, replaced the original mode that adopts the condensate to wash and spray, both alleviateed and know the load of hydrolysising, retrieved the urea in the technology condensate again, can also reduce the steam quantity of the system of hydrolysising simultaneously, energy saving consumed the festival.
Description
Technical Field
The utility model relates to a urea desorption field of hydrolysising specifically is a urea desorption system of hydrolysising.
Background
At present, the domestic urea production adopts a urea deep desorption hydrolysis system to treat process condensate generated in the process production process and recover ammonia and CO in the process condensate 2 And urea, the technological process and principle of the desorption hydrolysis system (see figure 1) are as follows: process condensate (NH) from urea plants 3 ：5.5%，CO 2 :2.5%, ur: 1.5%) of ammonia water enters the upper part of the upper section of a desorption tower 1, and free ammonia and CO in the ammonia water are desorbed by heating low-pressure steam 2 The reaction temperature is 139 ℃, the liquid out of the upper section of the desorption tower 1 is heated by a hydrolysis pump 3 and a hydrolysis heat exchanger 4 and enters the upper part of a hydrolysis tower 2, medium-pressure steam is introduced into the lower part of the hydrolysis tower 2 to increase the temperature of the liquid to 190 ℃, the urea content in the effluent liquid of the hydrolysis tower 2 is reduced to be less than 5ppm, the temperature is reduced by the hydrolysis heat exchanger 4 and enters the upper part of the lower section of the desorption tower 1, and free ammonia and CO in the liquid are heated by low-pressure steam 2 Desorbing again, after the gas phase at the top of the hydrolysis tower 2 enters the upper section of the desorption tower 1, NH 3 And CO 2 The water vapor carried with the water vapor enters a reflux system together for condensation, recovery and desorption of ammonia and CO 2 。
However, with the capacity expansion of the urea production device, the amount of process condensate is greatly increased and seriously exceeds the design load of the desorption hydrolysis system, so that the desorption hydrolysis system cannot meet the production requirement of a main system, the treated waste liquid cannot normally reach the standard, the desorption hydrolysis system has the problems of small adjustment space, high operation difficulty and the like, most enterprises are forced to invest in adding a set of desorption hydrolysis system or transforming a desorption hydrolysis tower; secondly, the process condensate contains about 1.5 percent of urea, and enters a hydrolysis tower 2 to consume steam to be heated to above 160 ℃ and be decomposed into ammonia and CO 2 Recovered ammonia and CO 2 The urea is recycled to the high-pressure system to synthesize the urea, the energy consumption is inevitably increased, and if the urea in the process condensate can be directly recovered, the urea can be directly recoveredTo save energy consumption.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a solve the waste liquid that current urea technology condensate desorption system exists and can not normally reach standard and the great problem of energy consumption, provide a urea desorption system of hydrolysising.
The utility model discloses a through following technical scheme: a urea desorption hydrolysis system comprises a desorption tower, a hydrolysis pump and a hydrolysis heat exchanger, wherein the hydrolysis pump and the hydrolysis heat exchanger are sequentially connected between the lower part of the upper section of the desorption tower and the upper part of the hydrolysis tower through pipelines;
the lower part of the upper section of the desorption tower is connected in parallel with a cooler through a pipeline, and a liquid outlet of the cooler is connected with a liquid inlet pipe of the granulated dust washer through a centrifugal pump.
As a further improvement of the technical proposal of the utility model, the centrifugal pump is connected with the upper liquid inlet pipe of the granulating dust washer.
As a further improvement of the technical scheme of the utility model, granulation dust scrubber is still including a jar body, top, lower part and the bottom of the jar body are provided with gas vent, air inlet and drain respectively, internal from the top down of jar has set gradually liquid distributor, has packed down liquid distributor, has packed down and collecting tank, it is connected with last liquid distributor to go up the liquid inlet pipe, the air inlet is located down packs and the collecting tank between the jar body, the collecting tank outside is provided with the circulating pump, the circulating pump is connected with liquid distributor down through lower feed liquor pipe, go up liquid distributor and all be provided with the shower nozzle on the liquid distributor down.
As a further improvement of the technical proposal of the utility model, the pipeline of the liquid outlet of the circulating pump is connected with the liquid collecting pipe.
As a further improvement, the utility model discloses technical scheme, be provided with first valve on the pipeline of the liquid outlet of circulating pump, be provided with the second valve on the collector tube, the collector tube is located between the liquid outlet of circulating pump and the first valve.
As a further improvement, the utility model discloses technical scheme, go up on the liquid feeding pipe and have connect the steam condensate pipeline, upward be provided with the third valve on the liquid feeding pipe, be provided with the fourth valve on the steam condensate pipeline, the steam condensate pipeline is located between the third valve and the jar body.
Urea desorption system of hydrolysising, compare with prior art, have following beneficial effect:
the utility model discloses in sending the liquid in the desorber to granulation dust scrubber, replaced the original mode that adopts the condensate to wash and spray, both alleviateed and know the load of hydrolysising, retrieved the urea in the technology condensate again, can also reduce the steam quantity of the system of hydrolysising simultaneously, energy saving consumed the festival.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of the urea desorption hydrolysis system of the utility model.
In the figure: 1-desorption tower, 101-reflux system pipeline, 102-process condensate pipeline, 103-waste liquid delivery pipeline, 2-hydrolysis tower, 3-hydrolysis pump, 4-hydrolysis heat exchanger, 5-cooler, 6-centrifugal pump, 7-granulation dust scrubber, 701-upper liquid inlet pipe, 702-tank, 703-exhaust port, 704-air inlet, 705-drain outlet, 706-upper liquid distributor, 707-upper filler, 708-lower liquid distributor, 709-lower filler, 710-liquid collecting tank, 711-circulating pump, 712-lower liquid inlet pipe, 713-liquid collecting pipe, 714-first valve, 715-second valve, 716-third valve, 8-steam condensate pipeline, 801-fourth valve.
Detailed Description
The technical solutions of the present invention will be described below clearly and completely, and it should be apparent that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
As shown in fig. 1, the present invention provides a specific embodiment of urea desorption hydrolysis system, which comprises a desorption tower 1, a hydrolysis tower 2, a hydrolysis pump 3 and a hydrolysis heat exchanger 4 sequentially connected between the lower part of the upper section of the desorption tower 1 and the upper part of the hydrolysis tower 2 through pipelines, wherein the bottom of the hydrolysis tower 2 is connected to the upper part of the lower section of the desorption tower 1 through pipelines and the hydrolysis heat exchanger 4, and the top of the hydrolysis tower 2 is connected to the upper part of the upper section of the desorption tower 1 through pipelines;
the lower part of the upper section of the desorption tower 1 is connected in parallel to a cooler 5 through a pipeline, and a liquid outlet of the cooler 5 is connected to a liquid inlet pipe of a granulated dust scrubber 7 through a centrifugal pump 6.
When the device is used, the urea process condensate enters the upper part of the upper section of the desorption tower 1 through the process condensate pipeline 102, the urea process condensate is mixed with ascending low-pressure steam (from LS) at the upper part of the upper section of the desorption tower, the urea process condensate is stripped and heated, and the obtained gases such as carbon dioxide, ammonia gas and the like are recycled through the reflux system pipeline 101.
Part of the rest urea process condensate enters the cold side of a hydrolysis heat exchanger 4 through a hydrolysis pump 3 and then enters the upper part of a hydrolysis tower 2, medium-pressure steam (from MS) is mixed with the urea process condensate in the ascending process, the urea process condensate is further stripped and heated, urea in the urea process condensate is further decomposed into carbon dioxide and ammonia, and the gases such as the carbon dioxide and the ammonia enter the upper part of the upper section of a desorption tower 1 and are recycled through a reflux system pipeline 101; the residual urea process condensate in the hydrolysis tower 2 enters the hot side of the hydrolysis heat exchanger 4, then enters the upper part of the lower section of the desorption tower 1, is mixed with the ascending low-pressure steam, the further separated carbon dioxide and ammonia gas enter the desorption tower 1, and the waste liquid is recycled through a waste liquid outward conveying pipeline 103.
The other part of the residual urea process condensate entering the upper part of the upper section of the desorption tower 1 enters a cooler 5 for cooling and then is sent to a prilling dust scrubber 7 to participate in urea dust scrubbing through a centrifugal pump 6. The partial urea process condensate does not need to participate in desorption, can be directly applied to urea dust washing, and the washed washing liquid can be directly concentrated and granulated, so that the urea hydrolysis reaction of the urea process condensate in the hydrolysis tower 2 is reduced.
The embodiment further provides a specific implementation manner of the granulated dust scrubber 7, that is, the centrifugal pump 6 is connected to an upper liquid inlet pipe 701 of the granulated dust scrubber 7, the granulated dust scrubber 7 further comprises a tank 702, an air outlet 703, an air inlet 704 and a sewage drain 705 are respectively arranged at the top, the lower part and the bottom of the tank 702, an upper liquid distributor 706, an upper filler 707, a lower liquid distributor 708, a lower filler 709 and a liquid collecting tank 710 are sequentially arranged in the tank 702 from top to bottom, the upper liquid inlet pipe 701 is connected with the upper liquid distributor 706, the air inlet 704 is located on the tank 702 between the lower filler 709 and the liquid collecting tank 710, a circulating pump 711 is arranged outside the liquid collecting tank 710, the circulating pump 711 is connected with the lower liquid distributor 708 through a lower liquid inlet pipe 712, and spray heads are respectively arranged on the upper liquid distributor 706 and the lower liquid distributor 708.
Specifically, urea dust enters the tank body 702 through the air inlet 704, liquid in the liquid collecting tank 710 enters the spray heads on the lower liquid distributor 708 through the circulating pump 711 and the lower liquid inlet pipe 712 to be sprayed out, urea process condensate entering the upper liquid inlet pipe 701 is sprayed out through the spray heads on the upper liquid distributor 706, the sprayed water flow washes residual dust in the gas in the tank body 702, and the washed water flow flows into the liquid collecting tank 710 and then is circularly washed through the circulating pump 711; the flushed gas with water mist is absorbed and decomposed by the lower filler 709 and the upper filler 707 in the rising process, the gas rising to the top of the tank body 702 is clean gas and is discharged through the exhaust port 703, and the sediment at the bottom of the liquid collecting tank 710 is discharged through the sewage discharge port 705. The embodiment can effectively utilize the urea process condensate, and spray the urea dust by the urea process condensate, thereby saving the use amount of the steam condensate of the original granulation dust scrubber 7, effectively recovering the urea in the urea process condensate by the granulation dust scrubber 7, and reducing the steam use amount of the hydrolysis system.
Preferably, a liquid collecting pipe 713 is connected in parallel to a pipeline of a liquid outlet of the circulating pump 711. When the liquid urea content in the liquid collecting tank 710 reaches a certain concentration, the urea can be further sent to an evaporation system through a liquid collecting pipe 713 for concentration granulation.
Further, a first valve 714 is arranged on a pipeline of the liquid outlet of the circulating pump 711, a second valve 715 is arranged on the liquid collecting pipe 713, and the liquid collecting pipe 713 is located between the liquid outlet of the circulating pump 711 and the first valve 714. In a specific application, when the concentration in the liquid collecting tank 710 is low, the second valve 715 on the liquid collecting pipe 713 is closed, the first valve 714 is opened, and the liquid is circularly conveyed into the tank 702 through the circulating pump 711; when the concentration in the liquid collecting tank 710 reaches a certain concentration, the second valve 715 on the liquid collecting pipe 713 is opened, the first valve 714 is closed, and the liquid is further sent to the evaporation system through the liquid collecting pipe 713 for concentration granulation.
Further, a steam condensate pipeline 8 is connected to the upper liquid inlet pipe 701 in parallel, a third valve 716 is arranged on the upper liquid inlet pipe 701, a fourth valve 801 is arranged on the steam condensate pipeline 8, and the steam condensate pipeline 8 is located between the third valve 716 and the tank 702. When the hydrolysis system is stopped or the spray liquid cannot be normally supplied abnormally, the third valve 716 is closed, the fourth valve 801 on the steam condensate line 8 is opened, and the spray washing of the granulated dust washer 7 by the steam condensate is resumed.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (6)
1. A urea desorption hydrolysis system comprises a desorption tower (1), a hydrolysis tower (2), a hydrolysis pump (3) and a hydrolysis heat exchanger (4) which are sequentially connected between the lower part of the upper section of the desorption tower (1) and the upper part of the hydrolysis tower (2) through pipelines, wherein the bottom of the hydrolysis tower (2) is connected to the upper part of the lower section of the desorption tower (1) through a pipeline and the hydrolysis heat exchanger (4), and the top of the hydrolysis tower (2) is connected to the upper part of the upper section of the desorption tower (1) through a pipeline; it is characterized in that the preparation method is characterized in that,
the lower part of the upper section of the desorption tower (1) is connected with a cooler (5) in parallel through a pipeline, and a liquid outlet of the cooler (5) is connected with a liquid inlet pipe of a granulating dust washer (7) through a centrifugal pump (6).
2. A urea desorption hydrolysis system according to claim 1, characterized in that said centrifugal pump (6) is connected to the upper liquid feed pipe (701) of the prilling dust scrubber (7).
3. A urea desorption hydrolysis system according to claim 2, wherein the granulation dust scrubber (7) further comprises a tank (702), the top, the lower part and the bottom of the tank (702) are respectively provided with an exhaust port (703), an air inlet (704) and a sewage drain (705), the tank (702) is internally provided with an upper liquid distributor (706), an upper filler (707), a lower liquid distributor (708), a lower filler (709) and a liquid collecting tank (710) from top to bottom in sequence, the upper liquid inlet pipe (701) is connected with the upper liquid distributor (706), the air inlet (704) is positioned on the tank (702) between the lower filler (709) and the liquid collecting tank (710), the outside of the liquid collecting tank (710) is provided with a circulating pump (711), the circulating pump (711) is connected with the lower liquid distributor (708) through the lower liquid inlet pipe (712), and spray nozzles are arranged on the upper liquid distributor (706) and the lower liquid distributor (708).
4. A urea desorption hydrolysis system according to claim 3, wherein the pipeline of the liquid outlet of said circulating pump (711) is connected with a liquid collecting pipe (713) in parallel.
5. A urea desorption hydrolysis system according to claim 4, wherein a first valve (714) is arranged on the pipeline of the liquid outlet of the circulating pump (711), a second valve (715) is arranged on the liquid collecting pipe (713), and the liquid collecting pipe (713) is located between the liquid outlet of the circulating pump (711) and the first valve (714).
6. A urea desorption hydrolysis system according to claim 3, 4 or 5, wherein the upper feed pipe (701) is connected in parallel with a steam condensate line (8), a third valve (716) is arranged on the upper feed pipe (701), a fourth valve (801) is arranged on the steam condensate line (8), and the steam condensate line (8) is arranged between the third valve (716) and the tank (702).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222200732.8U CN217910444U (en) | 2022-08-19 | 2022-08-19 | Urea desorption system of hydrolysising |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222200732.8U CN217910444U (en) | 2022-08-19 | 2022-08-19 | Urea desorption system of hydrolysising |
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| Publication Number | Publication Date |
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| CN217910444U true CN217910444U (en) | 2022-11-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222200732.8U Active CN217910444U (en) | 2022-08-19 | 2022-08-19 | Urea desorption system of hydrolysising |
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- 2022-08-19 CN CN202222200732.8U patent/CN217910444U/en active Active
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