CN212549226U - Ship reducing agent storage system - Google Patents
Ship reducing agent storage system Download PDFInfo
- Publication number
- CN212549226U CN212549226U CN202021164575.4U CN202021164575U CN212549226U CN 212549226 U CN212549226 U CN 212549226U CN 202021164575 U CN202021164575 U CN 202021164575U CN 212549226 U CN212549226 U CN 212549226U
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- Prior art keywords
- urea solution
- tank
- pure water
- dissolving tank
- urea
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- 238000003860 storage Methods 0.000 title claims abstract description 106
- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 16
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 116
- 239000004202 carbamide Substances 0.000 claims abstract description 115
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 109
- 238000001816 cooling Methods 0.000 claims abstract description 18
- 239000000243 solution Substances 0.000 claims description 76
- 239000007788 liquid Substances 0.000 claims description 28
- 238000001223 reverse osmosis Methods 0.000 claims description 9
- 239000012528 membrane Substances 0.000 claims description 6
- 238000002347 injection Methods 0.000 claims description 5
- 239000007924 injection Substances 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 abstract description 8
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 12
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 238000005057 refrigeration Methods 0.000 description 4
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 238000007865 diluting Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- JADDQZYHOWSFJD-FLNNQWSLSA-N N-ethyl-5'-carboxamidoadenosine Chemical compound O[C@@H]1[C@H](O)[C@@H](C(=O)NCC)O[C@H]1N1C2=NC=NC(N)=C2N=C1 JADDQZYHOWSFJD-FLNNQWSLSA-N 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Abstract
The utility model discloses a boats and ships reductant storage system belongs to the boats and ships field. Urea solution preparation module in this system includes pure water storage jar and dissolving tank, the output of pure water storage jar passes through mass flow meter and links to each other with the top of dissolving tank, the bottom of dissolving tank link to each other with at least one urea solution holding vessel. The urea solution storage module in the system comprises two urea solution storage tanks, and the prepared urea solution is cooled to 25-35 ℃ through a cold water unit, a water tank and a cooling coil, so that the urea solution can be stored for a long time and guaranteed quality at low temperature, and the AUS40 urea solution meeting the requirements is conveyed to the SCR system. The system provided by the utility model can ensure that urea solution can be stable, reliably save.
Description
Technical Field
The utility model relates to a storage device of reductant, in particular to urea solution storage system during marine tail gas denitration treatment.
Background
The nitrogen oxides in the exhaust gas of the marine diesel engine cause serious pollution to the atmospheric environment, the international maritime organization determines the implementation time of the Tier III emission standard in the 66 th meeting of the maritime environmental protection Committee, the three-level emission regulation (Tier III) is formally effective in 2016, 1 and 1 days, and is in a specified nitrogen oxide emission control area (NO emission control area) after 2021 yearxEmission Control Areas, NECA) the Emission of nitrogen oxides from low speed diesel engines must be reduced to below 3.4g/kWh, and ships that do not meet the requirements of the corresponding sea area Emission regulations will not be allowed to travel in this area. Aiming at the increasingly strict emission regulations of nitrogen oxides of marine diesel engines, the combustion performance is improved only by improving and optimizing the structural parameters of the diesel engines or adding auxiliary devices, and new emission requirements cannot be met. In view of this, a large number of ships are beginning to be equipped with SCR systems to increase the removal of nitrogen oxidesExcept for efficiency, to meet the emission requirements of Tier III.
SCR systems often use liquid ammonia, ammonia and urea as reducing agents. After being mixed with air, the liquid ammonia and the air can explode when meeting open fire, and are not suitable for being carried by ships; the storage condition of aqueous ammonia is comparatively strict, and boats and ships shake can lead to the aqueous ammonia to decompose, has the potential safety hazard. The urea solution is non-toxic and harmless and can release NH under certain conditions3The reaction is safe and the by-products are harmless, so that the catalyst is an ideal ammonia source for the ship SCR system.
The ship SCR system generally uses a urea solution (AUS 40) with the mass concentration of 40%, the optimal storage temperature is between 5 and 35 ℃, urea is separated out when the storage temperature is lower than 2 ℃, and the urea is easy to deteriorate when the storage temperature is higher than 40 ℃.
SUMMERY OF THE UTILITY MODEL
The utility model provides a boats and ships reductant storage system to the problem that prior art exists.
The purpose of the utility model can be realized by the following technical scheme:
the utility model provides a boats and ships reductant storage system, urea solution preparation module in this system includes pure water storage jar and dissolving tank, the output of pure water storage jar links to each other through mass flow meter and dissolving tank's top, dissolving tank's bottom link to each other with at least one urea solution holding vessel.
The utility model discloses among the technical scheme: and a high liquid level float switch, a low liquid level float switch and a liquid level sensor are arranged in the pure water storage tank and the dissolving tank.
The utility model discloses among the technical scheme: the top of dissolving tank is equipped with the dog-house, and the lower part is equipped with electric heater, and inside is equipped with the agitator, and the bottom is equipped with concentration detector.
The utility model discloses among the technical scheme: the bottom of dissolving tank link to each other with first urea solution storage jar and second urea solution storage jar respectively, and the bottom of at least one urea solution storage jar links to each other with urea injection system, first urea solution storage jar and second urea solution storage jar in all be equipped with cooling coil.
The utility model discloses among the technical scheme: the top of the cooling coil is connected with the bottom of the cooling coil through a water tank and a water chilling unit.
The utility model discloses among the technical scheme: the top of pure water storage jar links to each other with pure water apparatus for producing, pure water apparatus for producing include high-pressure pump and reverse osmosis membrane.
The utility model discloses among the technical scheme: the urea solution storage module consists of a first urea solution storage tank, a second urea solution storage tank, a water chilling unit, a water tank and a urea solution conveying pipeline.
In some more preferred embodiments: the electric control system mainly comprises a main electric control box, a pure water preparation module, a urea dissolving module and a urea storage module, and is centrally controlled through a PLC.
The utility model discloses among the technical scheme: the pure water preparation module adopts a second-level reverse osmosis membrane to prepare industrial pure water, and the water quality is 3-level pure water meeting the GB/T6682 specification.
The utility model discloses among the technical scheme: an electric heater in the urea dissolving tank needs to heat the water to 60-70 ℃ to accelerate the dissolving process of urea in water.
The utility model discloses among the technical scheme: the water temperature prepared by the water chilling unit is controlled to be 6-7 ℃ so as to cool the urea solution in the storage tank to 25-35 ℃.
Drawings
FIG. 1 is a schematic structural diagram of the system of the present invention
Wherein: 1 is the high-pressure pump, 2 is reverse osmosis membrane, 3 is pure water storage jar, 4 is the dissolving tank, 5 is high liquid level float switch, 6 is low liquid level float switch, 7 is level sensor, 8 dog-house, 9 mass flow meter, 10 heaters, 11 agitators, 12 is concentration detector, 13 is the circulating pump, 14 is first urea solution storage jar, 15 is second urea solution storage jar, 16 is cooling coil, 17 is the cooling water set, 18 is the water tank, 19 is main electric cabinet, 20 is the reverse osmosis unit electric cabinet, 21 is pure water storage jar electric cabinet, 22 is urea dissolving tank electric cabinet, 23 is urea storage jar electric cabinet, 24 is the cooling water set electric cabinet.
The utility model has the advantages that:
(1) the urea solution preparation module has the function of on-line monitoring of the concentration of the urea solution, can accurately control the concentration of the urea solution and has the function of automatic fine adjustment of the concentration;
(2) the solid urea particles are fully dissolved in the water by heating, stirring, circulating stirring and other modes;
(3) the refrigerating unit in the urea solution storage module can quickly cool the urea solution and store the urea solution at low temperature for a long time.
Detailed Description
The present invention will be further explained with reference to the following embodiments, but the scope of the present invention is not limited thereto:
example 1
Referring to fig. 1, the marine reducing agent storage system comprises a pure water storage tank 3 and a dissolving tank 4, wherein the output end of the pure water storage tank 3 is connected with the top of the dissolving tank 4 through a mass flow meter 9, and the bottom end of the dissolving tank 4 is connected with at least one urea solution storage tank. A high liquid level float switch 5, a low liquid level float switch 6 and a liquid level meter 7 are arranged in the pure water storage tank 3 and the dissolving tank 4. The top of dissolving tank 4 is equipped with dog-house 8, and the lower part is equipped with electric heater 10, and inside is equipped with agitator 11, and the bottom is equipped with concentration detector 12. The bottom of dissolving tank 4 link to each other with first urea solution storage jar 14 and second urea solution storage jar 15 respectively through circulating pump 13, the bottom of at least one urea solution storage jar links to each other with urea injection system, first urea solution storage jar 14 and second urea solution storage jar 15 in all be equipped with cooling coil 16. The top of the cooling coil 16 is connected to the bottom of the cooling coil 16 by a water tank 18 and a chiller 17. The top of pure water storage jar 3 links to each other with pure water apparatus for producing, pure water apparatus for producing include high-pressure pump 1 and reverse osmosis membrane 2.
The process flow for preparing and storing the urea solution is as follows:
when the water level in the pure water storage tank is lower than the high liquid level, the pure water production device continuously conveys the pure water into the pure water storage tank. When the water level in the pure water storage tank is above the low liquid level, the urea solution preparation procedure can be started. At this time, the pure water delivery pump is started to deliver pure water into the urea dissolving tank, and when the water level in the dissolving tank rises above the intermediate liquid level, the water pump stops running. During the water injection, operating personnel can prepare the urea granule of certain quality before on top operation platform, and when the temperature rose to more than 40 ℃, the agitator began to operate, and operator's accessible top dog-house drops into urea to dissolving the jar in, and pure water delivery pump carried the pure water to dissolving the jar in once more after the batch charging, and electric heater, agitator continue the operation simultaneously. The electric heater is automatically controlled by the water temperature to ensure that the water temperature for dissolving the urea is always above 60 ℃. After the stirrer is operated for 1.5 hours, the circulating pump on the dissolving tank is started to operate so as to accelerate the dissolving process of the urea in the water.
If the detected concentration of the urea solution is higher than 41%, calculating the water supplementing amount required by diluting the urea solution, starting the electric heater and the stirrer, and simultaneously delivering a certain amount of water into the dissolving tank by the pure water delivery pump. If the detected concentration of the urea solution is lower than 39%, a certain amount of urea is fed into the dissolving tank through the feeding port.
And (3) conveying the prepared urea solution to a urea solution storage tank 14 and a urea solution storage tank 15, starting a water chilling unit when the temperature of the urea solution in the storage tank is above 35 ℃ and the liquid level in the storage tank is higher than a low liquid level, continuously conveying 6-7 ℃ cold water into a cooling coil in the storage tank through a cold water conveying pipeline for cooling the urea solution in the storage tank until the urea solution in the storage tank is cooled to below 25 ℃, and returning the circulating hot water to a water tank of the water chilling unit. The water chilling unit preferentially selects the urea solution storage tank with the higher liquid level as a refrigeration object, and if the liquid levels of the urea solutions in the two storage tanks are the same, the control system preferentially selects the first urea solution storage tank 14 as the refrigeration object.
Example 2
Referring to fig. 1, a storage system for a marine reducing agent is formed by sequentially connecting a pure water preparation module, a urea dissolving module and a urea solution storage module. In addition, an electric control system is equipped to control the start and stop of each module.
Referring to fig. 1, the marine reducing agent storage system comprises a pure water storage tank 3 and a dissolving tank 4, wherein the output end of the pure water storage tank 3 is connected with the top of the dissolving tank 4 through a mass flow meter 9, and the bottom end of the dissolving tank 4 is connected with at least one urea solution storage tank. A high liquid level float switch 5, a low liquid level float switch 6 and a liquid level meter 7 are arranged in the pure water storage tank 3 and the dissolving tank 4. The top of the dissolving tank 4 is provided with a feeding port 8, the lower part is provided with a heater 10, and the bottom is provided with a concentration detector 12. The bottom of dissolving tank 4 link to each other with first urea solution storage jar 14 and second urea solution storage jar 15 respectively, first urea solution storage jar 14 and second urea solution storage jar 15 in all be equipped with cooling coil 16. The top of the cooling coil 16 is connected to the bottom of the cooling coil 16 by a water tank 18 and a chiller 17. The top of pure water storage jar 3 links to each other with pure water apparatus for producing, pure water apparatus for producing include high-pressure pump 1 and reverse osmosis membrane 2.
The electric control system mainly comprises a main electric control box 19, a reverse osmosis device electric control box 20, a pure water storage tank electric control box 21, a urea dissolving tank electric control box 22, a urea storage tank electric control box 23 and a water chilling unit electric control box 24, and is centrally controlled through a PLC.
The process flow for preparing and storing the urea solution is as follows:
when the main control system of the main electric control box detects that the water level in the pure water storage tank is lower than the high liquid level, the electric control box of the reverse osmosis device controls the automatic start of the pure water preparation module to continuously convey pure water into the pure water storage tank. When the water level in the pure water storage tank is higher than the low liquid level, the main electric control system automatically sends out an instruction to start a urea solution preparation program. At the moment, the pure water storage tank electric control system of the pure water storage tank electric control box starts the pure water delivery pump to deliver pure water into the urea dissolving tank, and the water pump stops running when the water level in the dissolving tank rises above the middle liquid level. During the water injection, operating personnel can prepare the urea granule of certain quality before on top operation platform, and when the temperature rose to more than 40 ℃, urea dissolving tank electrical system control agitator began to operate, and operator's accessible top dog-house drops into urea to dissolving tank, and the pure water delivery pump continues to carry quantitative pure water to dissolving tank in after the batch feed, and electric heater, agitator continue to operate simultaneously. The electric heater is automatically controlled by the water temperature to ensure that the water temperature for dissolving the urea is always above 60 ℃. After the stirrer is operated for 1.5 hours, the circulating pump on the dissolving tank is started to operate so as to accelerate the dissolving process of the urea in the water.
If the detected concentration of the urea solution is higher than 41%, the electric control system automatically calculates the water supplementing amount required by diluting the urea solution, the electric control system continuously operates the electric heater and the stirrer, and meanwhile, the pure water delivery pump delivers quantitative water to the dissolving tank. If the detected concentration of the urea solution is lower than 39%, the electronic control system informs an operator of the required urea quality, and the operator can feed quantitative urea through a urea feeding port at the top.
The prepared urea solution is conveyed to a urea solution storage tank 14 and a urea solution storage tank 15, when the electronic control system detects that the temperature of the urea solution in the storage tank is above 35 ℃ and the liquid level in the tank is higher than the low liquid level, the electronic control system of the water chilling unit is started and continuously conveys cold water with the temperature of 6-7 ℃ into a cooling coil in the storage tank through a cold water conveying pipeline for circularly cooling the urea solution in the storage tank until the urea solution in the tank is cooled to below 25 ℃, and circulating hot water returns to a water tank of the water chilling unit. The water chilling unit preferentially selects the urea solution storage tank with a high liquid level as a refrigeration object, and if the liquid levels of the urea solutions in the two storage tanks are the same, the control system preferentially selects 14 tanks as the refrigeration object.
When the SCR system is operating, if the urea solution storage tank 14 is a service tank of the SCR system, the urea solution delivery process is started, and the electronic control system delivers the urea solution into the urea solution storage tank 15. After the delivery of urea solution from the urea solution storage tank 15 is completed, the control system does not deliver urea solution to the urea solution storage tank 14 until the SCR system is shut down or the service tank of the SCR system is switched to another storage tank.
Claims (6)
1. A marine reductant storage system, characterized by: the system comprises a pure water production device, a pure water storage tank (3) and a dissolving tank (4), wherein the output end of the pure water storage tank (3) is connected with the top of the dissolving tank (4) through a mass flow meter (9), and the bottom end of the dissolving tank (4) is connected with at least one urea solution storage tank.
2. The marine reductant storage system of claim 1, wherein: a high liquid level float switch (5), a low liquid level float switch (6) and a liquid level sensor (7) are arranged in the pure water storage tank (3) and the dissolving tank (4).
3. The marine reductant storage system of claim 1, wherein: the top end of the dissolving tank (4) is provided with a feeding port (8), the lower part of the dissolving tank is provided with a heater (10), the inside of the dissolving tank is provided with a stirrer (11), and the bottom of the dissolving tank is provided with a concentration detector (12).
4. The marine reductant storage system of claim 1, wherein: the bottom of dissolving tank (4) link to each other with first urea solution storage jar (14) and second urea solution storage jar (15) respectively, and the bottom of at least one urea solution storage jar links to each other with urea injection system, first urea solution storage jar (14) and second urea solution storage jar (15) in all be equipped with cooling coil (16).
5. The marine reductant storage system of claim 4, wherein: the top of the cooling coil (16) is connected with the bottom of the cooling coil (16) through a water tank (18) and a water chilling unit (17).
6. The marine reductant storage system of claim 1, wherein: the top of pure water storage jar (3) links to each other with pure water apparatus for producing, pure water apparatus for producing include high-pressure pump (1) and reverse osmosis membrane (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021164575.4U CN212549226U (en) | 2020-06-22 | 2020-06-22 | Ship reducing agent storage system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021164575.4U CN212549226U (en) | 2020-06-22 | 2020-06-22 | Ship reducing agent storage system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212549226U true CN212549226U (en) | 2021-02-19 |
Family
ID=74613473
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021164575.4U Expired - Fee Related CN212549226U (en) | 2020-06-22 | 2020-06-22 | Ship reducing agent storage system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212549226U (en) |
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2020
- 2020-06-22 CN CN202021164575.4U patent/CN212549226U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
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Granted publication date: 20210219 |