CN220919218U - Urea hydrolysis reactor utilizing water drainage - Google Patents
Urea hydrolysis reactor utilizing water drainage Download PDFInfo
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- CN220919218U CN220919218U CN202322545651.6U CN202322545651U CN220919218U CN 220919218 U CN220919218 U CN 220919218U CN 202322545651 U CN202322545651 U CN 202322545651U CN 220919218 U CN220919218 U CN 220919218U
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- steam
- heating
- reactor
- reactor shell
- urea hydrolysis
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 49
- 239000004202 carbamide Substances 0.000 title claims abstract description 49
- 238000006460 hydrolysis reaction Methods 0.000 title claims abstract description 26
- 230000007062 hydrolysis Effects 0.000 title claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims description 23
- 238000010438 heat treatment Methods 0.000 claims abstract description 60
- 239000007791 liquid phase Substances 0.000 claims abstract description 11
- 238000005192 partition Methods 0.000 claims abstract description 11
- 239000012071 phase Substances 0.000 claims abstract description 5
- 230000002209 hydrophobic effect Effects 0.000 claims description 16
- 239000007788 liquid Substances 0.000 claims description 7
- 239000002699 waste material Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 4
- 239000000243 solution Substances 0.000 description 21
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 12
- 239000007789 gas Substances 0.000 description 11
- 229910021529 ammonia Inorganic materials 0.000 description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 229920006395 saturated elastomer Polymers 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
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- Exhaust Gas After Treatment (AREA)
Abstract
The utility model discloses a urea hydrolysis reactor utilizing drainage, which comprises a reactor shell, wherein one end of the inner side of the reactor shell is separated by a flange to form a tube box cylinder body and a heating zone, the heating zone is divided into a heating zone and a preheating zone, and the tube box cylinder body is communicated with the preheating zone through a steam drainage pipeline; a gas phase space is arranged above the heating zone of the reactor shell, a liquid phase space is arranged below the heating zone of the reactor shell, and the liquid phase space is divided into a heating area and a preheating area by a partition plate; a heating coil is arranged in the heating area of the reactor shell, and is connected with the flange and communicated with the tube box cylinder. By arranging the steam drainage pipeline, the urea solution can be heated by utilizing steam drainage, so that steam consumption is reduced, steam utilization rate is improved, energy sources and cost are saved, and the urea solution drainage system is simple in system, convenient to process and convenient to overhaul.
Description
Technical Field
The invention relates to the field of denitration by an environment-friendly technology, in particular to an ammonia production system by utilizing hydrophobic urea hydrolysis.
Background
The urea hydrolysis ammonia production technology is widely applied to flue gas denitration engineering because of the characteristics of simple process, high urea utilization rate, simple construction and the like. The urea hydrolysis ammonia production technology is as follows: heating 40-50% urea solution by steam or electric heating, hydrolyzing at 140-160deg.C under 0.4-0.6 MPa to generate mixed gas of ammonia, carbon dioxide and water vapor, diluting with hot dilution air at an ammonia-air mixer after passing through a metering and distributing module, and finally entering a flue gas mixing system to remove NOx in flue gas.
When the flue gas denitration of the power plant adopts the urea hydrolysis ammonia production technology, the heat source is usually steam, the steam is usually Gao Wenfu steam with the pressure of about 1.0MPa, saturated steam with the temperature and pressure reduced to 0.8MPa and 170 ℃ enters a heating coil of the urea hydrolysis reactor, the urea solution in the urea hydrolysis reactor is heated in a coil heat exchange mode, and then the saturated steam is condensed into high-temperature hydrophobic water and is directly discharged out of the hydrolysis reactor. Currently, two methods are proposed for recovering high-temperature hydrophobic property: firstly, recycling high-temperature drainage to a drainage tank, and then dissolving urea, desuperheating water and the like; and secondly, heating the urea solution entering the urea hydrolysis reactor. The former can not fully utilize the heat efficiency of high temperature drainage, the latter is generally to add heat exchanger and valve outside the hydrolyzer, or to add barrel and heat exchange tube bundle in the steam heating tube bundle department, because the tube bundle is arranged more densely, the system is complicated, processing implementation is difficult, and the inconvenient heating coil that takes out when overhauing.
The present utility model has been made in order to solve these problems.
Summary of the utility model
The utility model aims to provide a urea hydrolysis reactor utilizing hydrophobic water to solve the technical problems, and the device not only can improve the utilization rate of water with the height Wen Shu, but also has the advantages of simple system, convenient processing and implementation, convenient maintenance and overhaul and resource saving.
One object of the utility model can be achieved by the following technical scheme:
A urea hydrolysis reactor utilizing drainage comprises a reactor shell, wherein one end of the inner side of the reactor shell is separated by a flange to form a tube box cylinder body and a heating zone, the heating zone is divided into a heating zone and a preheating zone, and the tube box cylinder body is communicated with the preheating zone through a steam drainage pipeline.
Further, a gas phase space is arranged above the heating area of the reactor shell, a liquid phase space is arranged below the heating area of the reactor shell, and the liquid phase space is divided into a heating area and a preheating area by a second partition plate.
Preferably, a heating coil is arranged in the heating area of the reactor shell, and the heating coil is connected with the flange and communicated with the tube box cylinder.
Further, a drainage coil is arranged in the preheating area and is communicated with the tube box body through a steam drainage pipeline, and a drainage outlet is arranged at one end of the drainage pipeline.
Preferably, the urea solution inlet is arranged at the lower part in the preheating area.
Preferably, the tube box cylinder is divided into two parts by a first partition plate: the upper part is a heating steam space, and the lower part is a steam drainage space.
Further, steam in the steam drainage space is conveyed to the drainage coil pipe at the other end of the reactor shell through the drainage pipeline to form a drainage preheating coil pipe, and the heating steam space, the heating coil pipe and the steam drainage space are communicated.
Preferably, a steam inlet is arranged above the heating steam space and connected with a steam pipeline through the steam inlet, the length of the drainage coil is not more than three tenths of the length of the reactor shell, and the height of the second partition plate is not more than the radius of the reactor shell.
Preferably, the top of the reactor shell is provided with a radar liquid level meter interface, a safety valve outlet and a product gas outlet, and a steam-water separator is arranged in the product gas outlet.
Furthermore, the side wall of the liquid phase of the reactor shell is provided with a thermal resistance interface, and the bottom is provided with a waste liquid pollution discharge interface.
The beneficial technical effects are as follows:
By arranging the steam drainage pipeline, the urea solution can be heated by utilizing steam drainage, so that steam consumption is reduced, steam utilization rate is improved, energy sources and cost are saved, and the urea solution drainage system is simple in system, convenient to process and convenient to overhaul.
Drawings
The utility model is further described below with reference to the accompanying drawings.
FIG. 1 is a block diagram of a urea hydrolysis reactor utilizing hydrophobicity.
Detailed Description
The technical solutions of the embodiments of the present utility model will be clearly and completely described below in conjunction with the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
As shown in fig. 1, a urea hydrolysis reactor utilizing drainage is a horizontal shell-and-tube pressure vessel and comprises a reactor shell 1, one end of the inner side of the reactor shell 1 is separated by a flange 17 to form a tube box cylinder 5 and a heating zone, the heating zone is divided into a heating zone and a preheating zone, and the tube box cylinder 5 is communicated with the preheating zone through a steam drainage pipeline 10.
The reactor shell 1 has a gas phase space above the heating zone and a liquid phase space below the heating zone, the gas phase space and the liquid phase space each occupy half of the heating zone, and the liquid phase space is partitioned into a heating zone and a preheating zone by a second partition 13.
A heating coil 2 is arranged in the heating zone of the reactor shell 1, the heating coil 2 is connected with a flange 17 and is communicated with the tube box cylinder 5, and the heating coil 2 is used for heating urea solution.
A drain coil 14 is arranged in the preheating area, the drain coil 14 is communicated with the tube box cylinder 5 through a steam drain pipeline 10, the drain coil 14 is used for preheating urea solution, one end of the drain pipeline 10 is provided with a drain outlet 8, and the drain outlet 8 is communicated with the outside of the reactor shell 1.
The lower part in the preheating zone is provided with a urea solution inlet 9.
The tube box barrel 5 is divided into two parts by a first partition plate 6: the upper part is a heating steam space, a steam inlet 7 is arranged above the heating steam space, the heating steam space is connected with a steam pipeline through the steam inlet 7, the lower part is a steam drainage space, and steam in the steam drainage space is conveyed to a drainage coil 14 at the other end of the reactor shell 1 through a drainage pipeline 10 to form a drainage preheating coil and is discharged to the outside of the reactor through a drainage outlet 8; the heating steam space, the heating coil 2 and the steam drainage space are communicated.
The water drain pipe 10 may be provided outside the reactor housing 1, and a water drain valve group is provided on the water drain pipe 10.
A support 16 is provided below the reactor shell 1.
The top of the reactor shell 1 is provided with a radar liquid level meter interface 15, a safety valve outlet 4 and a product gas outlet 3, and a steam-water separator is arranged in the product gas outlet 3.
The side wall of the liquid phase of the reactor shell 1 is provided with a thermal resistance interface 11, and the bottom is provided with a waste liquid pollution discharge interface 12. The length of the hydrophobic coil 14 does not exceed three-tenths of the length of the reactor shell 1. The second partition 13 has a height not greater than the radius of the reactor shell 1.
When the device is used, urea solution enters the reactor shell 1 from the urea solution inlet 9, is preheated to 80-90 ℃ by the hydrophobic coil 14, overflows to the other side through the second partition plate 13, and the height of the urea solution in the reactor is measured by the radar level gauge, so that the height of the urea solution is ensured to be half of the diameter of the reactor. The urea solution is heated by heating steam (saturated steam at 170-180 ℃ and 0.7-0.8 MPa) entering the heating coil 2 through the steam inlet 7, and the heating steam runs inside the heating coil 2 and is not in direct contact with the urea solution. The urea solution is subjected to hydrolysis reaction at 130-160 ℃ and 0.35-0.55MPa to generate mixed gas containing ammonia, dioxide and water vapor, and the mixed gas is discharged from the reactor shell 1 through the product gas outlet 3 after liquid drops are removed by a steam-water separator.
The drain water generated by heating steam becomes high-temperature drain water after being drained through a drain pipe 10, the drain water enters a drain coil 14 and is discharged through a drain port 8, the drain water temperature is 110-120 ℃, and the drain water can be further used for dissolving urea solution. Since the urea solution contains impurities, the urea solution needs to be discharged at intervals of one week and is discharged through the waste liquid discharge port 12, and if an accident or maintenance occurs, the urea solution can be discharged through the port.
While the fundamental and principal features of the utility model and advantages of the utility model have been shown and described, it will be apparent to those skilled in the art that the utility model is not limited to the details of the foregoing exemplary embodiments, but may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model 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.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (10)
1. The urea hydrolysis reactor utilizing the drainage is characterized by comprising a reactor shell (1), wherein one end of the inner side of the reactor shell (1) is separated by a flange (17) to form a pipe box cylinder body (5) and a heating zone, the heating zone is divided into a heating zone and a preheating zone, and the pipe box cylinder body (5) is communicated with the preheating zone through a steam drainage pipeline (10).
2. A urea hydrolysis reactor according to claim 1 utilizing hydrophobic properties, characterized in that the heating zone of the reactor shell (1) is above a gas phase space and below a liquid phase space, which is divided by a second partition (13) into a heating zone and a preheating zone.
3. A urea hydrolysis reactor according to claim 2, characterized in that a heating coil (2) is arranged in the heating zone of the reactor housing (1), the heating coil (2) being connected to a flange (17) and in communication with the tank cylinder (5).
4. Urea hydrolysis reactor according to claim 2, characterized in that a hydrophobic coil (14) is arranged in the preheating zone, the hydrophobic coil (14) is connected to the tank body (5) via a steam hydrophobic pipe (10), and a hydrophobic outlet (8) is arranged at one end of the hydrophobic pipe (10).
5. A urea hydrolysis reactor with hydrophobic properties according to claim 2, characterized in that the lower part in the preheating zone is provided with a urea solution inlet (9).
6. The urea hydrolysis reactor with hydrophobic properties according to claim 5, characterized in that the tube box cylinder (5) is divided into two parts by a first partition (6): the upper part is a heating steam space, and the lower part is a steam drainage space.
7. The urea hydrolysis reactor according to claim 6, wherein the steam in the steam trap space is delivered to the drain coil (14) at the other end of the reactor shell (1) through the drain pipe (10) to form a drain preheating coil, and the heating steam space, the heating coil (2) and the steam trap space are communicated.
8. The urea hydrolysis reactor according to claim 6, characterized in that the heating steam space is provided with a steam inlet (7) above, connected to the steam pipe by means of the steam inlet (7), the length of the water drain coil (14) does not exceed three tenths of the length of the reactor shell (1), and the height of the second partition (13) is not greater than the radius of the reactor shell (1).
9. The urea hydrolysis reactor utilizing hydrophobic water according to claim 1, wherein the top of the reactor shell (1) is provided with a radar level gauge interface (15), a safety valve outlet (4) and a product gas outlet (3), and a steam-water separator is arranged in the product gas outlet (3).
10. The urea hydrolysis reactor utilizing hydrophobic water according to claim 1, wherein a thermal resistor interface (11) is arranged on the side wall of the liquid phase of the reactor shell (1), and a waste liquid drain interface (12) is arranged at the bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322545651.6U CN220919218U (en) | 2023-09-19 | 2023-09-19 | Urea hydrolysis reactor utilizing water drainage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322545651.6U CN220919218U (en) | 2023-09-19 | 2023-09-19 | Urea hydrolysis reactor utilizing water drainage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220919218U true CN220919218U (en) | 2024-05-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322545651.6U Active CN220919218U (en) | 2023-09-19 | 2023-09-19 | Urea hydrolysis reactor utilizing water drainage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220919218U (en) |
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2023
- 2023-09-19 CN CN202322545651.6U patent/CN220919218U/en active Active
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