CN107855003B - Ammonia water recycling device of ship denitration system based on SCR - Google Patents
Ammonia water recycling device of ship denitration system based on SCR Download PDFInfo
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- CN107855003B CN107855003B CN201711186364.3A CN201711186364A CN107855003B CN 107855003 B CN107855003 B CN 107855003B CN 201711186364 A CN201711186364 A CN 201711186364A CN 107855003 B CN107855003 B CN 107855003B
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- ammonia water
- ammonia
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- water
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- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 title claims abstract description 158
- 235000011114 ammonium hydroxide Nutrition 0.000 title claims abstract description 158
- 238000004064 recycling Methods 0.000 title claims abstract description 21
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 151
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 73
- 239000007788 liquid Substances 0.000 claims abstract description 33
- 238000010521 absorption reaction Methods 0.000 claims abstract description 25
- 238000001914 filtration Methods 0.000 claims abstract description 22
- 238000000746 purification Methods 0.000 claims abstract description 17
- 230000009615 deamination Effects 0.000 claims abstract description 10
- 238000006481 deamination reaction Methods 0.000 claims abstract description 10
- 239000007921 spray Substances 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 9
- 239000000243 solution Substances 0.000 description 7
- 239000003638 chemical reducing agent Substances 0.000 description 5
- 239000012535 impurity Substances 0.000 description 5
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 4
- 239000004202 carbamide Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 230000002265 prevention Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000011550 stock solution Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/96—Regeneration, reactivation or recycling of reactants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention relates to an ammonia water recycling device of a ship denitration system based on SCR, which comprises an ammonia water storage tank, an ammonia water mixing tank, an ammonia water collecting device, an ammonia water filtering tank, a deamination tower, an ammonia purification tank and an ammonia absorption tower; the ammonia water storage tank is connected with an ammonia water mixing tank through a liquid guide valve A, the ammonia water mixing tank sprays ammonia water through an ammonia water injector to be mixed with tail gas in the SCR ship denitration system, and an ammonia water collecting device is arranged at the lower end of the ammonia water injector; the ammonia water collecting device is connected with the ammonia water filtering tank through a liquid guide pipe, the ammonia water filtering tank is connected with the ammonia water purifying tank through a liquid guide valve B, the ammonia water purifying tank is connected with the ammonia water purifying tank through an air guide pipe, the other side of the ammonia water purifying tank is connected with the ammonia absorbing tower, and the ammonia absorbing tower is connected with the ammonia water mixing tank through a liquid guide valve C and a liquid discharge pipe. The invention has the advantages that: the ammonia water recycling device can collect and recycle sprayed ammonia water which is not fully utilized, and reduces the running cost.
Description
Technical Field
The invention belongs to the technical field of ammonia water recycling, and particularly relates to an ammonia water recycling device of a ship denitration system based on SCR.
Background
In the existing ship SCR denitration field, the currently used reducing agent mainly comprises liquid ammonia, urea solution and ammonia water, wherein the liquid ammonia has low input operation cost when in use, but the liquid ammonia belongs to dangerous goods and is easy to cause serious safety accidents; the urea solution is used as a reducing agent, so that urea needs to be pyrolyzed when the urea solution is put into operation, and the cost is high; the ammonia water is used as the reducing agent, if the method of evaporating the ammonia water into the ammonia gas is high in cost, the ammonia water is wasted by directly spraying the ammonia water by using the spray gun, and if the sprayed ammonia water which is not fully utilized can be collected and reused, the running cost can be reduced, and the method has high practical value.
Disclosure of Invention
The invention aims to solve the technical problem of providing an ammonia water recycling device of a ship denitration system based on SCR, which can collect and recycle sprayed ammonia water which is not fully utilized, and reduce the running cost.
In order to solve the technical problems, the technical scheme of the invention is as follows: the utility model provides a boats and ships denitration system's aqueous ammonia recycling device based on SCR which innovation point lies in: comprises an ammonia water storage tank, an ammonia water mixing tank, an ammonia water collecting device, an ammonia water filtering tank, a deamination tower, an ammonia purification tank and an ammonia absorption tower;
the ammonia water storage tank is connected with an ammonia water mixing tank through a liquid guide valve A, the ammonia water mixing tank sprays ammonia water through an ammonia water injector to be mixed with tail gas in the SCR ship denitration system, and an ammonia water collecting device is arranged at the lower end of the ammonia water injector;
The ammonia water collecting device is connected with the ammonia water filtering tank through a liquid guide pipe, the ammonia water filtering tank is connected with the ammonia water purifying tank through a liquid guide valve B, the ammonia water purifying tank is connected with the ammonia water purifying tank through an air guide pipe, the other side of the ammonia water purifying tank is connected with the ammonia absorbing tower, and the ammonia absorbing tower is connected with the ammonia water mixing tank through a liquid guide valve C and a liquid discharge pipe.
Further, a reverse suction prevention device is arranged between the ammonia purification tank and the ammonia suction tower.
Further, the ammonia water filtering tank is also connected with a liquid inlet valve and a liquid discharge valve.
Further, the deamination tower is also connected with a gas guide valve.
Further, the ammonia purification tank is also connected with a water inlet valve A.
Further, the ammonia absorption tower is also connected with a water inlet valve B.
Further, by adopting a fuzzy control method, the concentration of the ammonia water in the ammonia absorption tower is kept consistent with the concentration of the ammonia water in the ammonia water mixing tank by controlling the water inflow of the water inlet valves B at the two sides of the ammonia absorption tower and the introduction amount of the air guide valve B.
The invention has the advantages that:
(1) The invention discloses an ammonia water recycling device of a ship denitration system based on SCR (selective catalytic reduction), which aims to reduce the waste of ammonia water in the ship SCR denitration process, solve the problem of ammonia water waste caused by that ammonia water is sprayed on tail gas by a spray gun as a reducing agent and cannot be completely combined with the tail gas to be brought into a catalyst, provide a scheme for recycling the ammonia water with simple structure, lower cost and high feasibility, and send the collected ammonia water into an ammonia water mixing tank for recycling the SCR denitration system by collecting, filtering, deaminizing, purifying, dissolving and the like the ammonia water which is not utilized, thereby greatly reducing the operation cost of the ship SCR denitration system;
(2) The ammonia water recycling device of the ship denitration system based on SCR is characterized in that an ammonia water mixing tank is arranged behind an ammonia water storage tank and used for mixing ammonia water sent out of the ammonia water storage tank with ammonia water treated by an ammonia absorption tower, and the ammonia water is supplied to the SCR denitration system for use, so that the purity of the ammonia water in the ammonia water storage tank is ensured; an ammonia water filtering tank is arranged below the ammonia water collector, so that impurities insoluble in water in the collected ammonia water stock solution can be filtered, and the purity of the ammonia water is improved; an ammonia purifying tank is arranged behind the deamination tower, so that impurities in ammonia generated by the deamination tower can be purified, and the purity of the ammonia is ensured;
(3) The invention relates to an ammonia water recycling device of a ship denitration system based on SCR,
By adopting a fuzzy control method, the concentration of the ammonia water in the ammonia absorption tower 16 is kept consistent with the concentration of the ammonia water in the ammonia water mixing tank 3 by controlling the water inflow of the water inlet valve 18 and the ammonia input of the air guide valve 20, so that the recovered ammonia water can be more effectively recycled;
(4) According to the ammonia water recycling device of the ship denitration system based on SCR, the anti-suck-back device is further arranged between the ammonia purification tank and the ammonia absorption tower, so that the phenomenon of suck-back of ammonia in the process of dissolving in water can be effectively prevented.
Drawings
The invention will be described in further detail with reference to the drawings and the detailed description.
Fig. 1 is a schematic structural diagram of an ammonia water recycling device of a ship denitration system based on SCR.
Detailed Description
The following examples will provide those skilled in the art with a more complete understanding of the present invention and are not intended to limit the invention to the embodiments described.
Examples
The ammonia recycling device of the ship denitration system based on SCR of the embodiment comprises an ammonia storage tank 1, an ammonia mixing tank 3, an ammonia collecting device 4, an ammonia filtering tank 6, a deamination tower 10, an ammonia purifying tank 13 and an ammonia absorbing tower 16 as shown in fig. 1.
The ammonia water storage tank 1 is connected with the ammonia water mixing tank 3 through the liquid guide valve 2, the ammonia water mixing tank 3 is used for mixing ammonia water sprayed out through an ammonia water sprayer with tail gas in the SCR ship denitration system, and an ammonia water collecting device 4 is arranged at the lower end of the ammonia water sprayer.
The ammonia water collecting device 4 is connected with the ammonia water filtering tank 6 through the liquid guide pipe 5, the ammonia water filtering tank 6 is connected with the deamination tower 10 through the liquid guide valve 9, the deamination tower 10 is connected with the ammonia purification tank 13 through the air guide pipe 11, the other side of the ammonia purification tank 13 is connected with the ammonia absorption tower 16 through the air guide valve 20, and the ammonia absorption tower 16 is connected with the ammonia water mixing tank 3 through the liquid guide valve 17 and the liquid discharge pipe 19.
In this embodiment, a reverse suction prevention device 14 is further disposed between the ammonia purification tank 13 and the ammonia absorption tower 16, the ammonia water filtration tank 6 is further connected with a liquid inlet valve 7 and a liquid discharge valve 8, the ammonia removal tower 10 is further connected with a gas guide valve 12, the ammonia purification tank 13 is further connected with a water inlet valve 15, and the ammonia absorption tower 16 is further connected with a water inlet valve 18.
The ammonia water recycling device of the ship denitration system based on SCR of the embodiment has the working mechanism that:
When the SCR denitration system works, the liquid guide valve 2 is opened, so that ammonia water flows into the ammonia water mixing tank 3, and then the ammonia water is sprayed out by the ammonia water injector to be mixed with tail gas in the SCR ship denitration system.
In order to collect ammonia water which is not taken away by tail gas, in this embodiment, an ammonia water collecting device 4 is disposed at the lower end of the ammonia water injector, and is used for absorbing the unused ammonia water, the ammonia water collecting device 4 conveys the collected ammonia water solution to an ammonia water filtering tank 6 through a liquid guide tube 5, the ammonia water filtering tank 6 removes impurities insoluble in water in the collected ammonia water solution through a filter screen, and simultaneously, in order to avoid the influence of excessive impurities on the filtering effect, after the filtering is completed, a liquid inlet valve 7 and a liquid discharge valve 8 are opened, and the circulating water is used for cleaning the ammonia water filtering tank 6.
In order to obtain pure ammonia water, water is introduced into an ammonia purification tank 13 through a water inlet valve 15, the filtered ammonia water solution is conveyed into an ammonia removal tower 10 through a liquid guide valve 9, a gas guide valve 12 is opened, hot steam is introduced into the bottom of the ammonia removal tower 10, the ammonia water solution in the ammonia removal tower 10 is heated by steam, the ammonia water overflows after being heated, the overflowed ammonia water is introduced into water in the ammonia purification tank 13 through a gas guide pipe 11, the solubility of the ammonia water in the water is limited, ammonia is continuously introduced into the water, when the solubility reaches a critical level, the ammonia water overflows, other gaseous impurities except the ammonia water can be filtered out, the overflowed ammonia water is introduced into an ammonia absorption tower 16 through a pipeline, and an anti-suck-back device 14 is arranged between the ammonia absorption tower 16 and the ammonia purification tank 13 to prevent the occurrence of a suck-back reaction in the process of dissolving ammonia water into ammonia water in the next.
The ammonia absorption tower 16 is connected with a water inlet valve 18, the water inlet valve 18 is opened to introduce water into the ammonia absorption tower 16, the ammonia overflowed from the ammonia purification tank 13 is introduced into the water of the ammonia absorption tower 16, so that ammonia is dissolved in the water to form ammonia water, meanwhile, in order to enable the concentration of the formed ammonia water to be consistent with that in the ammonia water mixing tank 3, a fuzzy control method is adopted, sensors for measuring the concentration of the ammonia water are arranged in the ammonia water mixing tank 3 and the ammonia absorption tower 16, an ammonia concentration sensor is arranged in an air guide valve 20, the water inlet valve 18 is provided with a flow sensor, the accurate quantities measured by the sensors are converted into analog quantities suitable for fuzzy control, the quantities are calculated in a fuzzy controller, the calculation results are converted into accurate quantities, so that the inlet quantity of the ammonia water of the ammonia inlet valve 18 and the input quantity of the ammonia of the air guide valve 20 are controlled, the concentration of the ammonia water in the ammonia absorption tower 16 is consistent with that in the ammonia water mixing tank 3, at the moment, the liquid guide valve 17 is opened, the generated ammonia water is guided into the mixing tank 3 through a liquid discharge pipe 19, and the ammonia water is led out of the ammonia water mixing tank 1 to a reducing agent SCR system.
The foregoing has shown and described the basic principles and main features of the present invention and the advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. Ammonia water recycling device of ship denitration system based on SCR, its characterized in that: comprises an ammonia water storage tank, an ammonia water mixing tank, an ammonia water collecting device, an ammonia water filtering tank, a deamination tower, an ammonia purification tank and an ammonia absorption tower;
the ammonia water storage tank is connected with an ammonia water mixing tank through a liquid guide valve A, the ammonia water mixing tank sprays ammonia water through an ammonia water injector to be mixed with tail gas in the SCR ship denitration system, and an ammonia water collecting device is arranged at the lower end of the ammonia water injector;
The ammonia water collecting device is connected with an ammonia water filtering tank through a liquid guide pipe, the ammonia water filtering tank is connected with an ammonia removal tower through a liquid guide valve B, the ammonia removal tower is connected with an ammonia purification tank through an air guide pipe, the other side of the ammonia purification tank is also connected with an ammonia absorption tower, and the ammonia absorption tower is also connected with an ammonia water mixing tank through a liquid guide valve C and a liquid discharge pipe;
The ammonia absorption tower is also connected with a water inlet valve B;
by adopting a fuzzy control method, the concentration of the ammonia water in the ammonia absorption tower is kept consistent with the concentration of the ammonia water in the ammonia water mixing tank by controlling the water inflow of the water inlet valves B at the two sides of the ammonia absorption tower and the introduction amount of the air guide valve B;
an anti-suck-back device is also arranged between the ammonia purifying tank and the ammonia absorbing tower.
2. The ammonia water recycling device of the SCR-based ship denitration system according to claim 1, wherein: the ammonia water filtering tank is also connected with a liquid inlet valve and a liquid discharge valve.
3. The ammonia water recycling device of the SCR-based ship denitration system according to claim 1, wherein: the deamination tower is also connected with a gas guide valve A.
4. The ammonia water recycling device of the SCR-based ship denitration system according to claim 1, wherein: the ammonia purification tank is also connected with a water inlet valve A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711186364.3A CN107855003B (en) | 2017-11-24 | 2017-11-24 | Ammonia water recycling device of ship denitration system based on SCR |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711186364.3A CN107855003B (en) | 2017-11-24 | 2017-11-24 | Ammonia water recycling device of ship denitration system based on SCR |
Publications (2)
| Publication Number | Publication Date |
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| CN107855003A CN107855003A (en) | 2018-03-30 |
| CN107855003B true CN107855003B (en) | 2024-05-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711186364.3A Active CN107855003B (en) | 2017-11-24 | 2017-11-24 | Ammonia water recycling device of ship denitration system based on SCR |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110665337A (en) * | 2018-07-03 | 2020-01-10 | 山东恒昌圣诚化工股份有限公司 | Ammonia tail gas recovery device |
| CN109224777A (en) * | 2018-10-22 | 2019-01-18 | 浙江嘉化新材料有限公司 | A kind of Ammonia recovery system |
| WO2023002646A1 (en) * | 2021-07-21 | 2023-01-26 | 株式会社三井Ｅ＆Ｓマシナリー | Selective catalyst reduction system and reducing-agent stockpiling method |
| KR20230158087A (en) * | 2021-07-21 | 2023-11-17 | 미쯔이 이앤에스 씨오.,엘티디. | Selective reduction catalyst system and reducing agent storage method |
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| CN207628220U (en) * | 2017-11-24 | 2018-07-20 | 江苏科技大学 | A kind of ammonium hydroxide recycling device of the ship denitrating system based on SCR |
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2017
- 2017-11-24 CN CN201711186364.3A patent/CN107855003B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102179134A (en) * | 2011-04-26 | 2011-09-14 | 苏州利盛化工设备有限公司 | Ammonia water recovery device |
| CN202542883U (en) * | 2012-03-13 | 2012-11-21 | 联邦制药（成都）有限公司 | Ammonia water recovery device |
| KR20150012938A (en) * | 2013-07-26 | 2015-02-04 | 현대제철 주식회사 | Oxigen supply apparatus |
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| CN107855003A (en) | 2018-03-30 |
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