CN218410287U - A solution storage tank companion thermal system for urea is hydrolysised - Google Patents
A solution storage tank companion thermal system for urea is hydrolysised Download PDFInfo
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- CN218410287U CN218410287U CN202222585499.XU CN202222585499U CN218410287U CN 218410287 U CN218410287 U CN 218410287U CN 202222585499 U CN202222585499 U CN 202222585499U CN 218410287 U CN218410287 U CN 218410287U
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- urea
- storage tank
- heat tracing
- drain
- valve
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 82
- 239000004202 carbamide Substances 0.000 title claims abstract description 82
- 238000010438 heat treatment Methods 0.000 claims abstract description 28
- 230000002209 hydrophobic effect Effects 0.000 claims abstract description 18
- 230000001105 regulatory effect Effects 0.000 claims abstract description 12
- 238000006460 hydrolysis reaction Methods 0.000 claims description 18
- 230000007062 hydrolysis Effects 0.000 claims description 17
- 230000009467 reduction Effects 0.000 claims description 5
- 238000002425 crystallisation Methods 0.000 abstract description 4
- 230000008025 crystallization Effects 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 4
- 230000002411 adverse Effects 0.000 abstract description 2
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 239000002918 waste heat Substances 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 238000000034 method Methods 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003657 drainage water Substances 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The utility model discloses a solution storage tank companion thermal system for urea is hydrolysised, urea hydrolysising ware drain port are connected with storage tank heating coil and drain trap respectively, are equipped with hydrophobic companion's heat block valve and hydrophobic emission control valve on the connecting tube respectively. The storage tank heating coil is arranged inside the urea solution storage tank, and a heat tracing regulating valve is arranged at an inlet; the outlet is connected with a drain tank, and a drain valve and a check valve are arranged on the connecting pipeline. The steam outlet of the steam temperature and pressure reducing device is connected with the heating coil of the storage tank, the connection position is arranged between the drainage heat tracing isolating valve and the heat tracing regulating valve, and the connection pipeline is provided with a steam heat tracing isolating valve. The urea solution in the storage tank is subjected to heat tracing through the drainage of the urea hydrolyzer, the drainage temperature is reduced while the drainage waste heat is recovered, the energy consumption is saved, and the adverse effect of the drainage high temperature on downstream equipment is reduced; the heat tracing mode can be switched at any time, the heat tracing reliability is ensured, and the crystallization of the urea solution in the storage tank can be effectively avoided.
Description
Technical Field
The utility model relates to a flue gas denitration technical field especially indicates a solution storage tank companion thermal system for urea is hydrolysised.
Background
The urea hydrolysis process is one of important ways for supplying ammonia for denitration, and is applied to denitration projects of power plants more and more widely in recent years.
However, the common problems of the existing urea hydrolysis system reduce the good use experience of owners, influence the elimination and the project transfer of the tail industry, and cause high elimination cost and after-sale cost. When the urea hydrolyzer normally operates, steam with the pressure of 0.7-1.0 MPa and the temperature of 170-200 ℃ is used as a heat source, and the steam is drained directly into a drain box. When no external cooling water is added, the drainage temperature in the box is basically between 90 and 98 ℃, and a series of problems of large vibration of a drainage pump, damage of blades, water leakage of a water-free machine seal and the like are caused due to high drainage water temperature, so that the drainage temperature entering the drainage box needs to be reduced by taking measures. As the urea hydrolysis reaction needs to be within the range of 0.35-0.65 MPa and 135-160 ℃, the reaction efficiency is higher, and if the hydrophobic temperature discharged by the urea hydrolyzer is directly reduced, the reaction temperature in the hydrolyzer can be reduced, so that the urea decomposition rate is reduced, and the working efficiency of the urea hydrolyzer is influenced. The drainage generated by the urea hydrolyzer is usually excessive and needs to be discharged outside a urea hydrolysis system at irregular intervals, and if a method of adding demineralized water into the drainage is adopted, the amount of discharged water is increased, so that resource waste is caused, and the operation cost is increased. It can be seen that the above method is not suitable for solving the problem of high hydrophobic temperature of the urea hydrolyzer.
SUMMERY OF THE UTILITY MODEL
The utility model provides a solution storage tank companion thermal system for urea is hydrolysised has solved foretell problem among the prior art.
The technical scheme of the utility model is realized like this:
a solution tank heat tracing system for urea hydrolysis, comprising:
the system comprises a urea hydrolyzer, a steam temperature and pressure reduction device, a urea solution storage tank, a storage tank heating coil and a drain tank;
a plurality of groups of heating coils of the urea hydrolyzer, the urea solution storage tank and the storage tank are arranged;
the drain port of the urea hydrolyzer is connected with the drain tank through a pipeline, and a drain discharge regulating valve is arranged on the connecting pipeline.
The drain port of the urea hydrolyzer is also connected with the storage tank heating coil through a pipeline, and a drain heat tracing isolating valve is arranged on the connecting pipeline. The storage tank heating coil is arranged inside the urea solution storage tank, and a heat tracing regulating valve is arranged at an inlet of the storage tank heating coil; the outlet is connected with a drain tank, and a drain valve and a check valve are arranged on the connecting pipeline.
The steam outlet of the steam temperature and pressure reducing device is connected with the storage tank heating coil through a pipeline, the connection position is between the drainage heat tracing isolating valve and the heat tracing regulating valve, and the connecting pipeline is provided with a steam heat tracing isolating valve.
Preferably, the heat exchange area of the storage tank heating coil is designed according to the drainage heat tracing working condition and checked according to the steam heat tracing working condition.
Preferably, the drain port of the urea hydrolyzer is provided with a drain temperature transmitter before heat tracing.
Preferably, a urea solution temperature transmitter is arranged on the side wall of the urea solution storage tank.
Preferably, the outlet of the storage tank heating coil is provided with a heat tracing rear drainage temperature transmitter.
The utility model has the advantages that:
the urea solution in the storage tank is subjected to heat tracing through the drainage of the urea hydrolyzer, the drainage temperature is reduced while the drainage waste heat is recovered, the steam consumption of a hydrolysis system is reduced, the energy consumption is saved, and the adverse effect of the drainage high temperature on downstream equipment such as a drainage pump is reduced. In addition, the system can switch the heat tracing mode at any time, and adopts steam heat tracing wholly or partially according to the actual heat tracing requirement, so that the reliability of heat tracing is ensured, the temperature of the solution in the urea solution storage tank can be effectively maintained at 40-50 ℃, and the problem of urea crystallization is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings may be obtained according to these drawings without inventive exercise.
FIG. 1 is a schematic structural view of a solution storage tank heat tracing system for urea hydrolysis according to the present invention;
in the figure: 1. a urea hydrolyzer; 2. a steam temperature and pressure reducing device; 3. a urea solution storage tank; 4. a storage tank heating coil; 5. a drain tank; 6. a water-draining heat tracing isolating valve; 7. a drain discharge regulating valve; 8. a steam tracing block valve; 9. a heat tracing regulating valve; 10. a drain valve; 11. a check valve; 12. a hydrophobic temperature transmitter before heat tracing; 13. a urea solution temperature transmitter; 14. and (5) draining the water temperature transmitter after heat tracing.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying 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.
Fig. 1 shows a schematic structural diagram of a solution storage tank heat tracing system for urea hydrolysis provided by the utility model.
Specifically, as shown in fig. 1, the utility model provides a solution storage tank heat tracing system for urea hydrolysis, includes:
the system comprises a urea hydrolyzer 1, a steam temperature and pressure reduction device 2, a urea solution storage tank 3, a storage tank heating coil 4 and a drain tank 5;
in the present embodiment, there are two sets of the urea hydrolyzer 1, the urea solution storage tank 3, and the storage tank heating coil 4.
The drain port of the urea hydrolyzer 1 is respectively connected with a storage tank heating coil 4 and a drain tank 5 through pipelines, and a drain heat tracing block valve 6 and a drain discharge regulating valve 7 are respectively arranged on the connecting pipelines. The storage tank heating coil 4 is arranged inside the urea solution storage tank 3, and a heat tracing regulating valve 9 is arranged at an inlet; the outlet is connected with a drain tank, and a drain valve 10 and a check valve 1 are arranged on the connecting pipeline. The steam outlet of the steam temperature and pressure reduction device 2 is connected with the storage tank heating coil pipe 4 through a pipeline, the connection position is arranged between the drainage heat tracing isolating valve 6 and the heat tracing regulating valve 9, and the steam heat tracing isolating valve 8 is arranged on the connection pipeline.
Wherein, preferably, the heat exchange area of the storage tank heating coil 4 is designed according to the hydrophobic heat tracing working condition and checked according to the steam heat tracing working condition. The urea solution storage tank is not provided with a stirrer generally, the volume of the storage tank is large, and the liquid in the storage tank has low fluidity, so that the total heat exchange coefficient in the heat tracing process is close to the convection heat exchange coefficient of the urea solution outside the heating coil pipe 4 of the storage tank. Because the heat required by heat tracing is certain, and the heat exchange temperature difference of the hydrophobic heat tracing is smaller than that of the steam heat tracing, the heat exchange area required by the hydrophobic heat tracing is larger, and the design needs to be carried out according to the hydrophobic heat tracing condition. When the steam tracing working condition is checked, the steam flow or the heat exchange temperature difference can be properly reduced due to the large heat exchange area, and the effect of reducing the steam hydrophobic temperature can be achieved. Through the design, the system can switch the heat tracing mode at any time, and all or part of the system adopts steam heat tracing according to the actual heat tracing requirement.
Wherein, preferably, the drain port of the urea hydrolyzer 1 is provided with a drain temperature transmitter 12 before heat tracing, which is used for monitoring whether the drain temperature of urea hydrolysis is suitable for urea solution heat tracing.
Wherein, preferably, a urea solution temperature transmitter 13 is arranged on the side wall of the urea solution storage tank 3 and used for monitoring whether the temperature of the urea solution after heat tracing reaches 40-50 ℃.
Wherein, preferably, the outlet of the storage tank heating coil 4 is provided with a heat tracing drainage temperature transmitter 14 for monitoring whether the temperature of the drain water after heat tracing reaches 60-70 ℃.
The solution storage tank heat tracing method for urea hydrolysis comprises the following steps:
in the first step, in daily operation, a hydrophobic heat tracing blocking valve 6 is opened, a steam heat tracing blocking valve 8 is closed, the hydrophobic water of the urea hydrolyzer 1 is utilized to perform heat tracing on the urea solution in the urea solution storage tank 3, and the hydrophobic water after heat tracing is discharged into a hydrophobic tank 5.
And secondly, adjusting the opening degrees of the heat tracing adjusting valve 9 and the drain discharge adjusting valve 7, adjusting the drain flow entering the storage tank heating coil 4, and directly discharging redundant drain into the drain tank 5.
And thirdly, when the heat tracing requirement cannot be met only by depending on drainage, closing one or more drainage heat tracing blocking valves 6, opening one or more corresponding steam heat tracing blocking valves 8, adjusting the opening degrees of a heat tracing adjusting valve and a drainage discharge adjusting valve 7, carrying out heat tracing on the urea solution in one or more urea solution storage tanks 3 by using steam with the outlet of a steam temperature and pressure reducing device 2 of 0.7-1.0 MPa and the temperature of 170-200 ℃, and discharging the heated drainage into a drainage tank 5.
Wherein, the temperature of the urea solution in the urea solution storage tank 3 is preferably controlled to be 40-50 ℃. The mass concentration of the urea solution used in the urea hydrolysis system is 40-60%, and in order to avoid the crystallization of the solution, the temperature of the solution needs to be controlled to be above 10 ℃ of the crystallization point, and the heat tracing temperature is generally set to be 40-50 ℃.
Wherein, the temperature of the urea hydrolyzer 1 after hydrophobic heat tracing is preferably controlled to be 60-70 ℃. Reasonable heat exchange temperature difference should be kept inside and outside the heating coil of the storage tank, and if the temperature difference is too large, the drainage and cooling are not obvious, so that the protection effect on downstream equipment of a drainage tank is limited; the heat exchange area required by the over-small temperature difference is increased rapidly, so that the manufacturing cost is increased, and the urea solution storage tank cannot be mounted inside. Comprehensively considering, the temperature after the hydrophobic heat tracing is controlled to be 60-70 ℃.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A solution tank heat tracing system for urea hydrolysis, comprising:
the device comprises a urea hydrolyzer (1), a steam temperature and pressure reduction device (2), a urea solution storage tank (3), a storage tank heating coil (4) and a drain tank (5);
the drain port of the urea hydrolyzer (1) is connected with the drain tank (5) through a pipeline, and a drain discharge regulating valve (7) is arranged on the connecting pipeline;
the drain port of the urea hydrolyzer (1) is also connected with a storage tank heating coil (4) in the urea solution storage tank (3) through a pipeline, and a drain tracing isolating valve (6) is arranged on the connecting pipeline;
a heat tracing regulating valve (9) is arranged at the inlet of the storage tank heating coil (4); the outlet is connected with a drain tank (5), and a drain valve (10) and a check valve (11) are arranged on the connecting pipeline;
steam temperature and pressure reduction device (2) steam outlet pass through the pipeline with storage tank heating coil (4) are connected, and the hookup location is in hydrophobic heat tracing block valve (6) with between heat tracing governing valve (9), be equipped with steam heat tracing block valve (8) on the connecting tube.
2. The solution storage tank heat tracing system for urea hydrolysis according to claim 1, wherein said urea hydrolyzer (1), urea solution storage tank (3), storage tank heating coil (4) are provided with multiple sets.
3. Solution tank heat tracing system for urea hydrolysis according to claim 1, characterized in that the drain port of the urea hydrolyser (1) is provided with a pre-heat tracing hydrophobic temperature transmitter (12).
4. Solution tank heat tracing system for urea hydrolysis according to claim 1, characterized in that on the side wall of said urea solution tank (3) there is a urea solution temperature transmitter (13).
5. Solution tank heat tracing system for urea hydrolysis according to claim 1, characterized in that the tank heating coil (4) outlet is provided with a heat tracing post-drain temperature transmitter (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222585499.XU CN218410287U (en) | 2022-09-28 | 2022-09-28 | A solution storage tank companion thermal system for urea is hydrolysised |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222585499.XU CN218410287U (en) | 2022-09-28 | 2022-09-28 | A solution storage tank companion thermal system for urea is hydrolysised |
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| Publication Number | Publication Date |
|---|---|
| CN218410287U true CN218410287U (en) | 2023-01-31 |
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| CN202222585499.XU Active CN218410287U (en) | 2022-09-28 | 2022-09-28 | A solution storage tank companion thermal system for urea is hydrolysised |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116025852A (en) * | 2023-03-28 | 2023-04-28 | 国能龙源环保有限公司 | Method for reducing urea solution temperature in urea solution storage tank |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116025852A (en) * | 2023-03-28 | 2023-04-28 | 国能龙源环保有限公司 | Method for reducing urea solution temperature in urea solution storage tank |
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Denomination of utility model: A solution storage tank heat tracing system for urea hydrolysis Effective date of registration: 20231225 Granted publication date: 20230131 Pledgee: Tongling Rural Commercial Bank Co.,Ltd. Beijing Road Branch Pledgor: Anhui boguangyun Environmental Protection Technology Co.,Ltd. Registration number: Y2023980074117 |