CN109649625B - A diffusion equipment for ship tail gas desulfurization system wastewater discharge - Google Patents
A diffusion equipment for ship tail gas desulfurization system wastewater discharge Download PDFInfo
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- CN109649625B CN109649625B CN201910104420.7A CN201910104420A CN109649625B CN 109649625 B CN109649625 B CN 109649625B CN 201910104420 A CN201910104420 A CN 201910104420A CN 109649625 B CN109649625 B CN 109649625B
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- 238000009792 diffusion process Methods 0.000 title claims abstract description 109
- 239000002351 wastewater Substances 0.000 title claims abstract description 41
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 20
- 230000023556 desulfurization Effects 0.000 title claims abstract description 20
- 230000002093 peripheral effect Effects 0.000 claims abstract description 53
- 238000010790 dilution Methods 0.000 claims description 5
- 239000012895 dilution Substances 0.000 claims description 5
- 235000007164 Oryza sativa Nutrition 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 235000009566 rice Nutrition 0.000 claims description 3
- 240000007594 Oryza sativa Species 0.000 claims 1
- 230000000903 blocking effect Effects 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 18
- 238000005406 washing Methods 0.000 description 15
- 239000007789 gas Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 8
- 239000002912 waste gas Substances 0.000 description 5
- 239000003546 flue gas Substances 0.000 description 4
- 239000013535 sea water Substances 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 230000003009 desulfurizing effect Effects 0.000 description 3
- 241000209094 Oryza Species 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 230000003321 amplification Effects 0.000 description 2
- 239000003657 drainage water Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63J—AUXILIARIES ON VESSELS
- B63J4/00—Arrangements of installations for treating ballast water, waste water, sewage, sludge, or refuse, or for preventing environmental pollution not otherwise provided for
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- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Toxicology (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a diffusion device for wastewater discharge of a ship tail gas desulfurization system. The central diffusion hole and the peripheral diffusion holes are arranged on the cylindrical body, and a certain hole elevation angle is arranged between the central line of the peripheral diffusion hole and the axis of the cylindrical body, so that the wastewater diffused from the peripheral diffusion holes is rapidly diffused towards the peripheral direction, the mutual concentration superposition of wastewater diffusion is less, the wastewater discharged from the peripheral holes is diffused out along the respective peripheral direction, and the drainage blocking interference between the peripheral diffusion holes can be further reduced, so that the drainage resistance can be well reduced, therefore, the diffusion device can achieve the purpose of effectively diffusing the wastewater under the lower resistance, and meets the requirements of IMO MPEC.
Description
Technical Field
The invention belongs to the technical field of ship tail gas washing, and particularly relates to a diffusion device for waste water discharge of a ship tail gas desulfurization system.
Background
With the development of international shipping industry and ocean-going ship transportation, the emission of exhaust gas generated by ships has become a major pollution source in coastal areas. The pollution of SOX in the exhaust gas discharged from ships to the atmospheric environment has attracted a great deal of attention in international society. At present, the washing and desulfurizing system (EGCS) of the ship exhaust gas is mainly divided into a wet washing and desulfurizing system, and almost occupies the whole washing and desulfurizing market of the ship.
The ship flue gas wet-type washing system has three different realization forms: sea water is used to wash waste gas (open system) and the alkali of sea water is used to absorb SO in waste gasXThe waste liquid generated by washing is discharged into the sea after being treated; the waste gas is washed by fresh water (a closed system), an added alkaline substance (such as NaOH) is used for reacting with SOX in the waste gas to generate salts, and washing waste liquid generated by the reaction is treated or stored on a ship or directly discharged into the sea; the seawater/alkali liquor washing waste gas (mixing system) combines the advantages of an open system and a closed system, and according to different conditionsOperating in open mode and closed mode.
For open systems, the main principle of flue gas desulfurization of ships is:
SO in flue gas2Reacting with seawater to generate SO3 2-：SO2+H2O→2H++SO3 2-
Thus, for an open desulfurization system, the wash wastewater is acidic.
The international maritime pollution prevention convention (MARPOL) specifies that the wash water discharge is regulated, and the pH of the wash water when the pH of the discharge water flow at a distance of 4 m from the outboard discharge point reaches 6.5 in a stationary state of the ship is used as the outboard wash water discharge limit value.
The plume formed by the waste water discharge of the existing ship flue gas washing device is easy to exceed the limit value specified by MARPOL if no diffusion device is added. In the prior art, the cross-shaped or star-shaped diffusion device is additionally arranged at the washing water discharge port to disturb the wastewater so as to accelerate diffusion, but the diffusion effect is poor in the implementation process, and along with the increase of the diffusion effect, the system resistance is easily increased, the wastewater discharge of the system is influenced, and therefore the effect is not obvious.
Disclosure of Invention
The invention aims to solve the technical problem that the system resistance is increased due to the increase of the diffusion effect of a cross-shaped or star-shaped diffusion device in the prior art, and aims to provide an amplification device for the wastewater discharge of a ship tail gas desulfurization system. The amplification device can still well realize the diffusion effect under lower resistance, and the pH value of the washing wastewater quickly reaches the level of pH6.5 at the position close to the discharge port, thereby reducing the influence of the acidity of the washing water on the water body.
The diffusion device for wastewater discharge of a ship tail gas desulfurization system of the present invention has a cylindrical body having:
a flat surface at one end of the cylindrical body;
the concave surface is positioned at the other end of the cylindrical body, and the concave surface is arranged opposite to the plane;
the central diffusion hole is positioned on the axis of the cylindrical body and penetrates from the center of the concave surface to the center of the plane;
and the peripheral diffusion holes are uniformly arranged around the central diffusion hole at intervals and penetrate from the concave surface to the plane.
Preferably, two adjacent peripheral diffusion holes form an inter-hole included angle θ with the axis of the cylindrical body, and the inter-hole included angle θ is between 24 ° and 120 °, and preferably between 45 ° and 60 °.
Preferably, the central line of the peripheral diffusion holes forms with the axis of the cylindrical body a hole elevation angle a comprised between 15 ° and 45 °, preferably between 25 ° and 35 °.
Preferably, the first and second liquid crystal display panels are,
the cylindrical body has a center thickness, the center thickness being the distance between the center of the concave surface and the center of the plane;
the cylindrical body has an edge thickness that is the distance directly from the edge of the concave surface to the edge of the flat surface;
the edge thickness of the cylindrical body is 3-12 times, preferably 4-8 times of the center thickness of the cylindrical body.
Preferably, the concave surface is a circular arc surface.
Preferably, the inlet edge of the central diffusion hole has a rounded corner, and the inlet edge of the peripheral diffusion hole has a rounded corner.
Preferably, the number of the peripheral diffusion holes is 3-15, preferably 5-8; radius of the cylindrical body: the cambered surface radius of the concave surface is as follows: radius of the central diffusion hole: the radius of the peripheral diffusion holes is 1: 1-2: 0.08-0.18: 0.12 to 0.28, preferably 1: 1.4-1.6: 0.1-0.17: 0.15 to 0.24.
The parameters of the diffusion device satisfy the following two formulas
S is a dilution constant, S is greater than 6.75;
a is the hole elevation angle formed by the central line of the peripheral diffusion hole and the axis of the cylindrical body, 15 ° < a <45 °;
d is the average diameter of the peripheral diffusion holes and the central diffusion hole, unit: rice, 7/8, the diameter of the central diffusion hole is smaller than that of the peripheral diffusion holes;
when S is more than 6.75, the pH of the water outlet is more than 2.8 and the pH is more than 6.5 at a position 4 m away from the water outlet (meeting the requirements of MEPC)
m is the mass flow of wastewater, unit: kilograms per second;
rho is the density of the wastewater, and kilograms are used for each cubic meter;
theta is the degree of an included angle between the holes;
d is the average diameter of the peripheral diffusion holes and the central diffusion hole, unit: meter, the diameter of the central diffusion hole is smaller than 7/8 of the diameter of the peripheral diffusion holes.
The pressure drop of the diffuser unit meets the system requirements.
The diffusion device for the wastewater discharge of the ship tail gas desulfurization system of the invention ensures that the wastewater diffused from the peripheral diffusion holes is rapidly diffused towards the peripheral direction rather than being sprayed out along the axis direction of the cylindrical body by arranging the central diffusion hole and the peripheral diffusion holes on the cylindrical body and arranging a certain hole elevation angle between the central line of the peripheral diffusion holes and the axis of the cylindrical body, thereby the wastewater diffusion mutual concentration superposition is less, the wastewater diffused from the central diffusion holes is not blocked, the wastewater discharged from the peripheral diffusion holes is diffused out along the respective peripheral direction, the drainage blocking interference between the peripheral diffusion holes can be further reduced, the drainage resistance can be well reduced, and the diffusion device can achieve the purpose of effectively diffusing the wastewater under the lower resistance, meets the requirements of MPEC.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
FIG. 1 is a schematic perspective view of a diffusion device according to the present invention;
FIG. 2 is a side view of a diffusion device of the present invention;
fig. 3 is a cross-sectional view of a diffusion device of the present invention.
Detailed Description
Fig. 1 shows a diffusion device for wastewater discharge of a ship tail gas desulfurization system according to the present invention. The diffusion device has a cylindrical body 10.
As shown in fig. 1-3, the diffuser has a nominal diameter phi, i.e., the diameter of the cylindrical body 10. The cylindrical body 10 has a flat surface 11, a concave surface 12, a central diffusion hole 13 and several peripheral diffusion holes 14. The flat surface 11 is located at one end of the cylindrical body 10; the concave surface 12 is located at the other end of the cylindrical body 10, and the concave surface 12 is disposed opposite to the plane 11. The central diffusion hole 13 is positioned on the axis of the cylindrical body and penetrates from the center of the concave surface 12 to the center of the plane 11; the peripheral diffusion holes 14 are arranged at regular intervals around the central diffusion hole 13, penetrating from the concave surface 12 to the flat surface 11. The number of the peripheral diffusion holes 14 is, for example, 3 to 15, preferably 5 to 8, and an included angle θ between two adjacent peripheral diffusion holes 14 and the axis of the cylindrical body 10 is between 24 ° and 120 °, preferably between 45 ° and 60 °. The central line of the peripheral diffusion holes 14 forms with the axis of the cylindrical body 10 a hole elevation angle a comprised between 15 ° and 45 °, preferably between 25 ° and 35 °. The center thickness of the cylindrical body 10 is the distance from the center of the concave surface to the center of the plane; the edge thickness of the cylindrical body 10 is the direct distance from the edge of the concave surface to the edge of the flat surface. The edge thickness of the cylindrical body 10 is 3 to 10 times, preferably 4 to 8 times, the center thickness of the cylindrical body. The concave surface 12 is, for example, a circular arc surface. The inlet side of the central diffusion hole 13 has a rounded corner and the inlet side of the peripheral diffusion holes 14 has a rounded corner. Radius of the cylindrical body: cambered surface radius of concave surface: radius of central diffusion hole: the radius of the peripheral diffusion holes is 1: 1-2: 0.08-0.18: 0.12 to 0.28, preferably 1: 1.4-1.6: 0.1-0.17: 0.15 to 0.24.
The parameters of the diffusion device satisfy the following two formulas
S is a dilution constant, S is greater than 6.75;
a is the hole elevation angle formed by the central line of the peripheral diffusion hole and the axis of the cylindrical body, 15 ° < a <45 °;
d is the average diameter of the peripheral diffusion holes and the central diffusion hole, unit: rice, 7/8, the diameter of the central diffusion hole is smaller than that of the peripheral diffusion holes;
when S is more than 6.75, the pH of the water outlet is more than 2.8 and the pH is more than 6.5 at a position 4 m away from the water outlet (meeting the requirements of MEPC)
m is the mass flow of wastewater, unit: kilograms per second;
rho is the density of the wastewater, and kilograms are used for each cubic meter;
theta is the degree of an included angle between the holes;
d is the average diameter of the peripheral diffusion holes and the central diffusion hole, unit: meter, the diameter of the central diffusion hole is smaller than 7/8 of the diameter of the peripheral diffusion holes.
The pressure drop of the diffuser unit meets the system requirements.
Example 1
The inner diameter of the drain pipe is 400mm, and the drainage flow is 600m3The pH of the drainage water was 2.6. The drainage dilution was diffused using the following diffusion apparatus. The diameter of the diffusion device is 400mm, the inner arc radius of the concave surface 12 is 280mm, the number of central diffusion holes is 1, and the aperture is 40mm(ii) a 6 peripheral diffusion holes with the hole diameters of 60mm respectively, the hole elevation angle a of 28 degrees and the inter-hole included angle theta of 60 degrees; the central thickness of the cylindrical body is 12mm each. The radius of the fillet at the inner side of each round hole is 8 mm. Under the structure, the pH value of the discharged water can reach 6.7 at a distance of 4 meters from the water outlet from 2.6 of the water outlet. The resistance level of the structural system is 32kpa, and the arrangement of the diffusion device obviously improves the effect of discharging and diluting the washing wastewater, so that the washing wastewater easily meets the requirement that the pH value of the washing wastewater reaches 6.5 at a position 4 meters away from a water outlet, which is required by the International maritime organization maritime environmental protection Committee (MPEC639 (28)).
Example 2
The inner diameter of the drain pipe is 300mm, and the drainage flow is 680m3The pH of the drainage water was 2.6. The drainage dilution was diffused using the following diffusion apparatus. The diameter of the diffusion device is 300mm, the radius of the inner arc of the concave surface 12 is 240mm, and 6 water drainage holes are formed in the arc surface. 1 central diffusion hole with the aperture of 50 mm; 5 peripheral diffusion holes with respective hole diameters of 70mm, hole elevation angles a of 30 degrees and hole included angles theta of 72 degrees; the central thickness of the cylindrical body is 10mm each. The radius of the fillet on the inner side edge of each round hole is 6 mm. Under the structure, the pH value of the discharged water can reach 6.6 at a distance of 4 meters from the water outlet 2.6, and the resistance of the diffuser is 40 kpa.
Claims (10)
1. A diffuser device for the discharge of wastewater from a marine exhaust gas desulfurization system, said diffuser device having a cylindrical body with:
a flat surface at one end of the cylindrical body;
the concave surface is positioned at the other end of the cylindrical body, and the concave surface is arranged opposite to the plane;
the central diffusion hole is positioned on the axis of the cylindrical body and penetrates from the center of the concave surface to the center of the plane;
a plurality of peripheral diffusion holes, wherein the peripheral diffusion holes are uniformly arranged around the central diffusion hole at intervals and penetrate from the concave surface to the plane;
wherein, two adjacent peripheral diffusion holes and the axis of the cylindrical body form an inter-hole included angle theta which is between 24 and 120 degrees; the central line of the peripheral diffusion hole and the axis of the cylindrical body form a hole elevation angle a which is between 15 and 45 degrees.
2. The diffuser device for ship tail gas desulfurization system wastewater discharge as set forth in claim 1, wherein the inter-hole angle θ is between 45 ° and 60 °.
3. The diffuser device for the wastewater discharge of a ship tail gas desulfurization system according to claim 1, wherein the hole elevation angle a is between 25 ° and 35 °.
4. The diffuser device for wastewater discharge from ship tail gas desulfurization system according to claim 1,
the cylindrical body has a center thickness, the center thickness being the distance between the center of the concave surface and the center of the plane;
the cylindrical body has an edge thickness that is the distance directly from the edge of the concave surface to the edge of the flat surface;
the edge thickness of the cylindrical body is 3-12 times of the central thickness of the cylindrical body.
5. The diffuser device for ship tail gas desulfurization system wastewater discharge of claim 4, wherein the edge thickness of the cylindrical body is 4 to 8 times the center thickness of the cylindrical body.
6. The diffuser device for ship tail gas desulfurization system wastewater discharge as set forth in claim 1, wherein said concave surface is a circular arc surface.
7. The diffuser assembly for the wastewater discharge of a marine tail gas desulfurization system as set forth in claim 1, wherein the inlet side of the central diffuser hole has a rounded corner, and the inlet side of the peripheral diffuser hole has a rounded corner.
8. The diffusion device for discharging wastewater of a ship tail gas desulfurization system according to claim 1, wherein the number of the peripheral diffusion holes is 3 to 15; radius of the cylindrical body: the cambered surface radius of the concave surface is as follows: radius of the central diffusion hole: the radius of the peripheral diffusion holes is 1: 1-2: 0.08-0.18: 0.12 to 0.28.
9. The diffusion device for discharging wastewater of a ship tail gas desulfurization system according to claim 8, wherein the number of the peripheral diffusion holes is 5 to 8; radius of the cylindrical body: the cambered surface radius of the concave surface is as follows: radius of the central diffusion hole: the radius of the peripheral diffusion holes is 1: 1.4-1.6: 0.1-0.17: 0.15 to 0.24.
10. The diffuser device for wastewater discharge of desulfurization system for marine exhaust according to claim 1, wherein the parameters of said diffuser device satisfy the following two formulas
S is a dilution constant, S is greater than 6.75;
a is the hole elevation angle formed by the central line of the peripheral diffusion hole and the axis of the cylindrical body, 15 ° < a <45 °;
d is the average diameter of the peripheral diffusion holes and the central diffusion hole, unit: rice, 7/8, the diameter of the central diffusion hole is smaller than that of the peripheral diffusion holes;
m is the mass flow of wastewater, unit: kilograms per second;
rho is the density of the wastewater, and kilograms are used for each cubic meter;
theta is the degree of an included angle between the holes;
d is the average diameter of the peripheral diffusion holes and the central diffusion hole, unit: meter, the diameter of the central diffusion hole is smaller than 7/8 of the diameter of the peripheral diffusion holes.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910104420.7A CN109649625B (en) | 2019-02-01 | 2019-02-01 | A diffusion equipment for ship tail gas desulfurization system wastewater discharge |
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| CN201910104420.7A CN109649625B (en) | 2019-02-01 | 2019-02-01 | A diffusion equipment for ship tail gas desulfurization system wastewater discharge |
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| CN109649625A CN109649625A (en) | 2019-04-19 |
| CN109649625B true CN109649625B (en) | 2020-11-10 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201232196Y (en) * | 2008-07-15 | 2009-05-06 | 河海大学 | Deep water diffuser for riverway double layer sewage discharge |
| KR100972093B1 (en) * | 2009-05-11 | 2010-07-22 | 김원주 | Drainage unit for bridge of an airtight structure easily installed drainpipe |
| TWI531403B (en) * | 2013-03-01 | 2016-05-01 | 格瑞福科技有限責任公司 | Underdrain filter for power generation and liquid process filtration vessels and method of using the same |
| CN205421495U (en) * | 2016-03-25 | 2016-08-03 | 交通运输部天津水运工程科学研究所 | Diffuser is discharged at sewage deep sea |
| CN206746287U (en) * | 2017-01-20 | 2017-12-15 | 上海天晓环保工程有限公司 | Disturbed flow pipe grid under the liquid that a kind of ship machine exhaust contaminant is administered |
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Denomination of invention: Diffusion device for wastewater discharge from ship exhaust desulfurization system Granted publication date: 20201110 Pledgee: Industrial and Commercial Bank of China Limited Shanghai pilot Free Trade Zone Branch Pledgor: SHANGHAI BLUESOUL ENVIRONMENTAL TECHNOLOGY CO.,LTD. Registration number: Y2024980040356 |