CN111346479A - Marine diesel engine waste gas foam washing cooling dust removal desulfurization integrated device - Google Patents

Marine diesel engine waste gas foam washing cooling dust removal desulfurization integrated device Download PDF

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Publication number
CN111346479A
CN111346479A CN202010182710.6A CN202010182710A CN111346479A CN 111346479 A CN111346479 A CN 111346479A CN 202010182710 A CN202010182710 A CN 202010182710A CN 111346479 A CN111346479 A CN 111346479A
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CN
China
Prior art keywords
absorption liquid
diesel engine
storage tank
marine diesel
integrated device
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Pending
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CN202010182710.6A
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Chinese (zh)
Inventor
李秋萍
胡运发
单文盼
刘德礼
周亚明
谢嘉
卢亚云
杨麒
刘婷婷
倪天强
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Shanghai Research Institute of Chemical Industry SRICI
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Shanghai Research Institute of Chemical Industry SRICI
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Priority to CN202010182710.6A priority Critical patent/CN111346479A/en
Publication of CN111346479A publication Critical patent/CN111346479A/en
Pending legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/14Separation 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 by absorption
    • B01D53/1456Removing acid components
    • B01D53/1481Removing sulfur dioxide or sulfur trioxide
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D47/00Separating dispersed particles from gases, air or vapours by liquid as separating agent
    • B01D47/06Spray cleaning
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/14Separation 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 by absorption
    • B01D53/18Absorbing units; Liquid distributors therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2258/00Sources of waste gases
    • B01D2258/01Engine exhaust gases
    • B01D2258/012Diesel engines and lean burn gasoline engines

Abstract

The invention relates to a marine diesel engine exhaust gas foam washing, cooling, dedusting and desulfurizing integrated device which comprises a washing pipe, an absorption liquid storage tank and an absorption liquid circulating pipeline, wherein the top end of the washing pipe is used as an exhaust gas inlet, the bottom end of the washing pipe extends into the absorption liquid storage tank, a quenching liquid spray head and an absorption liquid spray head with a vertically upward spray opening are sequentially arranged in the washing pipe from top to bottom, one end of the absorption liquid circulating pipeline is connected to the bottom of the absorption liquid storage tank, and the other end of the absorption liquid circulating pipeline is connected with the absorption liquid spray head. Compared with the prior art, the invention is suitable for SO2The device has the advantages of high removal efficiency, low pressure drop, strong load change adapting capability of the diesel engine, compact structure, small occupied area, convenient installation and maintenance, dust removal and rapid cooling, and can meet the emission requirement of the waste gas of the marine diesel engine.

Description

Marine diesel engine waste gas foam washing cooling dust removal desulfurization integrated device
Technical Field
The invention belongs to the technical field of marine diesel engine exhaust emission pollution control, and relates to a marine diesel engine exhaust foam washing, cooling, dedusting and desulfurizing integrated device.
Background
With the rapid development of the ship industry, the emission of ship exhaust gas pollutants is increased due to the common use of low-quality high-sulfur fuel. Large and medium ocean-going marine diesel engine SO2The emission is huge, a ship with 10 ten thousand tons consumes about 40 tons of fuel oil every day during sailing, and if the sulfur content of the used fuel oil is 3.5 percent, the SO discharged to the atmosphere every day by the ship is calculated2The total gas amount is as high as about 2.8t, and if the method for reducing the sulfur content of the marine fuel oil is used for meeting the increasingly strict international emission standard, the operation cost of the ship is greatly improved, so that each shipping company can bear no burden. At present, the sulfur-containing waste gas discharged by marine diesel engines is subjected to desulfurization treatment to reduce SO2And (4) optimizing the discharge amount.
Wet desulfurization finds application in the control of sulfur oxides in marine power plants at its high efficiency relative to dry and semi-dry desulfurization. Although wet desulphurization technology and devices are various, the wet desulphurization technology and devices are less suitable for ship desulphurization, and with the stricter requirements of international emission regulations on the ship sulfur emission control, the research on high-efficiency and low-cost ship desulphurization equipment is urgently needed. At present, a marine desulfurization tower mainly comprises a spray tower and a packed tower, but the spray tower occupies a large area, the gas-liquid two-phase contact mode is a liquid drop contact type, the contact is not sufficient, the dust removal and desulfurization efficiency is low, and in order to meet the stricter and stricter emission standard in future, multilayer spray is required, which inevitably needs to be adoptedThe height and the cost of the desulfurizing tower are increased; the gas-liquid two-phase contact mode of the packed tower is a liquid film contact type, tower internals such as packing and the like need to be installed, the risk of blockage is often caused when the packed tower is used for dedusting, and the packed tower has the disadvantages of complex pipeline design, high manufacturing cost, large volume and complex operation and maintenance. The space of the ship is limited, and certain requirements are made on the floor area of waste gas treatment facilities. The wet desulphurization has certain requirements on the temperature of inlet flue gas, and the overhigh temperature can cause the liquid level SO in the absorption tower2The equilibrium partial pressure rises, resulting in a drop in desulfurization efficiency; meanwhile, the service life of the brittle materials in the absorption tower is also reduced due to the excessively high flue gas temperature. The temperature of the flue gas of the marine diesel engine can reach about 400-500 ℃ under the high-pressure condition, and the temperature of the flue gas also reaches about 200-300 ℃ under the low-pressure condition, so that the flue gas needs to be subjected to cooling treatment before desulfurization.
In addition, due to the operating characteristics of marine diesel engines, the amount of exhaust gas discharged varies greatly with load, requiring greater operational flexibility of the desulfurization equipment. In addition, the conventional scrubber has low efficiency for removing fine particles, develops a novel efficient waste gas washing technology for meeting increasingly strict pollutant emission indexes, is matched with the conventional ship power device, and is a necessary way for promoting the development of the shipping industry in China.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the marine diesel engine exhaust gas foam scrubbing, cooling, dedusting and desulfurizing integrated device. The device has a function of controlling SO2The device has the advantages of high removal efficiency, low pressure drop, strong load change adapting capability of the diesel engine, compact structure, small occupied area, convenient installation and maintenance, dust removal and rapid cooling, and can meet the emission requirement of the waste gas of the marine diesel engine.
The purpose of the invention can be realized by the following technical scheme:
the utility model provides a marine diesel engine waste gas foam washing cooling dust removal desulfurization integrated device, includes washing pipe, absorption liquid storage tank and absorption liquid circulation pipeline, washing pipe top import as waste gas, the bottom stretches into in the absorption liquid storage tank, from the top down has arranged quench liquid shower nozzle and the perpendicular ascending absorption liquid shower nozzle of jet in proper order in the washing pipe, absorption liquid circulation pipeline's one end insert absorption liquid storage tank bottom, the other end is connected the absorption liquid shower nozzle.
Further, the washing pipe wash the union coupling by the one-level that the diameter is less and the great second grade of diameter and constitute, the absorption liquid shower nozzle divide into one-level absorption liquid shower nozzle and the second grade absorption liquid shower nozzle of installing in one-level washing pipe and second grade washing pipe, absorption liquid circulation pipeline include that the tip connects respectively the one-level absorption liquid circulation pipeline and the second grade absorption liquid circulation pipeline of one-level absorption liquid shower nozzle and second grade absorption liquid shower nozzle install in one-level washing pipe quench liquid shower nozzle.
Furthermore, 1-3 primary absorption liquid spray heads are arranged, and 1-6 secondary absorption liquid spray heads are arranged.
Furthermore, the primary absorption liquid circulating pipeline and the secondary absorption liquid circulating pipeline share one circulating pump.
Furthermore, the absorption liquid circulating pipeline also comprises an absorption liquid reflux pipeline with two ends respectively connected with an outlet pipe of the circulating pump and the absorption liquid storage tank, wherein an inlet pipe of the circulating pump is connected with the absorption liquid storage tank.
Furthermore, 2-10 quenching liquid spray heads are arranged and uniformly distributed in an annular shape, and spray ports of the quenching liquid spray heads are arranged in a 45-degree downward inclined mode.
Furthermore, the diameter of the opening of the absorption liquid spray head is 20-200 mm.
Furthermore, the absorption liquid storage tank in still be equipped with the defroster that is higher than the washpipe bottom, still be equipped with the outlet of purifying gas at the top of absorption liquid storage tank.
Furthermore, a liquid level meter and a PH meter are also arranged on the absorption liquid storage tank.
Furthermore, the absorption liquid storage tank is also provided with a process water pipeline for supplementing alkali liquor and water and a sewage pipeline for periodically discharging sewage.
Compared with the prior art, the invention has the following advantages:
(1) the absorption liquid spray head with the vertically upward spray opening is arranged in the washing pipe, and can reversely collide with the entering waste gas to generate a foam area, and gas-liquid two-phase turbulence contacts in the foam area, so that the mass transfer effect is enhanced, the desulfurization and dust removal efficiency is higher, and the energy consumption is lower;
(2) the absorption liquid spray head adopts a large-caliber spray head, so that the circulating liquid can have certain solid content, the spray head is not easy to block, the operation is stable and reliable, and the management and maintenance workload is small;
(3) the high-temperature flue gas can be quickly cooled in the washing pipe, and the condition of high-efficiency operation of desulfurization reaction is met;
(4) the operation flexibility is large, and the fluctuation of the waste gas amount caused by the load change of the marine diesel engine can be adapted;
(5) compact structure, low cost and small occupied area.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
The notation in the figure is:
1 is a first-stage washing pipe, 2 is a second-stage washing pipe, 3 is an absorption liquid storage tank, 4 is a circulating pump, 5 is an absorption liquid backflow pipeline, 6 is a first-stage absorption liquid circulating pipeline, 7 is a second-stage absorption liquid circulating pipeline, 8 is a quenching liquid pipeline, 9 is a quenching liquid spray head, 10 is a first-stage absorption liquid spray head, 11 is a second-stage absorption liquid spray head, 12 is a demister, 13 is a purified gas outlet, 14 is a PH meter, 15 is a liquid level meter, 16 is a pressure meter, 17 is a process water pipeline, and 18 is a sewage discharge pipeline.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
In the following embodiments or examples, unless otherwise specified, raw material reagents or functional parts such as a quenching liquid and an absorption liquid are indicated as conventional commercially available raw materials in the art or conventional parts for realizing corresponding functions.
The invention provides a marine diesel engine exhaust gas foam washing, cooling, dedusting and desulfurizing integrated device, which is structurally shown in figure 1 and comprises a washing pipe, an absorption liquid storage tank 3 and an absorption liquid circulating pipeline, wherein the top end of the washing pipe is used as an exhaust gas inlet, the bottom end of the washing pipe extends into the absorption liquid storage tank 3, a quenching liquid spray head 9 and an absorption liquid spray head with a spray opening vertically upward are sequentially arranged in the washing pipe from top to bottom, one end of the absorption liquid circulating pipeline is connected to the bottom of the absorption liquid storage tank 3, and the other end of the absorption liquid circulating pipeline is connected with the absorption liquid spray head.
In a specific embodiment of the present invention, the washing pipe is formed by connecting a first-stage washing pipe 1 with a smaller diameter and a second-stage washing pipe 2 with a larger diameter, the absorption liquid spray head is divided into a first-stage absorption liquid spray head 10 and a second-stage absorption liquid spray head 11 which are respectively installed in the first-stage washing pipe 1 and the second-stage washing pipe 2, the absorption liquid circulation pipeline comprises a first-stage absorption liquid circulation pipeline 6 and a second-stage absorption liquid circulation pipeline 7, the end parts of the first-stage absorption liquid circulation pipeline are respectively connected with the first-stage absorption liquid spray head 10 and the second-stage absorption liquid spray head 11, and the quenching liquid spray head 9 is installed in the first-stage washing pipe 1.
In a more specific embodiment, 1 to 3 primary absorption liquid spray heads 10 are arranged, and 1 to 6 secondary absorption liquid spray heads 11 are arranged.
In a more specific embodiment, the primary absorption liquid circulation line 6 and the secondary absorption liquid circulation line 7 share one circulation pump 4.
In a more specific embodiment, the absorption liquid circulation line further comprises an absorption liquid return line 5, two ends of which are respectively connected with an outlet pipe of the circulation pump 4 and the absorption liquid storage tank 3.
In a specific embodiment of the invention, 2-10 quenching liquid nozzles 9 are provided and are uniformly distributed in a ring shape, and the injection ports are arranged in a 45-degree downward inclination manner.
In a specific embodiment of the invention, the diameter of the opening of the absorption liquid spray head is 20-200 mm.
In a specific embodiment of the present invention, the absorption liquid storage tank 3 is further provided with a demister 12 higher than the bottom end of the washing pipe, and the top of the absorption liquid storage tank 3 is further provided with a purified gas outlet 13.
In a specific embodiment of the present invention, the absorption liquid tank 3 is further provided with a liquid level meter 15 and a PH meter 14.
In a particular embodiment of the invention, the absorption liquid tank 3 is further provided with a process water line 17 for replenishing lye and water and a blowdown line 18 for periodic blowdown.
The above embodiments can be implemented individually, or in any combination of two or more.
The above embodiments will be described in more detail with reference to specific examples.
Example 1:
the utility model provides a marine diesel engine waste gas foam washing cooling dust removal desulfurization integrated device, its structure is shown in figure 1, the device mainly includes one-level wash pipe 1, second grade wash pipe 2, absorption liquid storage tank 3, circulating pump 4, absorption liquid backflow pipeline 5 with absorption liquid storage tank 3 direct link to each other, one-level absorption liquid circulation pipeline 6 and second grade absorption liquid circulation pipeline 7, quench liquid pipeline 8, quench liquid shower nozzle 9, one-level absorption liquid shower nozzle 10 and second grade absorption liquid shower nozzle 11, defroster 12, purified gas export 13, process water pipeline 17, sewage pipes 18, PH meter 14, level gauge 15 and manometer 16 etc..
High-temperature waste gas at 200-300 ℃ from a marine diesel engine enters a washing pipe from top to bottom, and quenching liquid is sprayed out through a quenching liquid pipeline 8 and a quenching liquid spray head 9 to contact the high-temperature waste gas, so that the temperature is rapidly reduced. The quenching liquid pipeline 8 is provided with a regulating valve for regulating the flow of the quenching liquid, and the quenching liquid can use seawater or circulating absorption liquid. The absorption liquid is reversely sprayed out from the first-stage absorption liquid circulating pipeline 6 (and/or the second-stage absorption liquid circulating pipeline 7) and the first-stage absorption liquid spray head 10 (and/or the second-stage absorption liquid spray head) from bottom to top through the circulating pump 4, and reversely collides with the cooled waste gas to generate a foam area in the first-stage washing pipe 1 (and/or the second-stage washing pipe 2), and in the foam area, gas-liquid two phases are in high-speed turbulent flow contact and have large contact surface area, and are rapidly updated, so that the heat transfer and mass transfer processes are enhanced, and higher desulfurization and dust removal effects are achieved. The first-stage absorption liquid spray head 10 or the second-stage absorption liquid spray head 11 is a large-caliber spray head, the diameter of the opening is 20-200mm, the absorption liquid can have certain solid content, the spray head cannot be blocked, the liquid discharge amount can be reduced, and therefore the water consumption is saved. The large-opening nozzle has the other great advantages that the sprayed liquid is not atomized, the exhaust gas contains less fine liquid drops which make the gas and the liquid difficult to separate, and the trapped fine particles can be prevented from being carried away by the mist, so that the efficiency of removing the submicron particles can reach more than 97 percent.
The whole washing pipe is divided into two sections with different diameters so as to adapt to the load change of the diesel engine. The pipe diameter of the upper washing pipe (namely the first-level washing pipe 1) is smaller, 1 first-level absorption liquid spray nozzle 10 is arranged in the pipe, an adjusting valve is arranged on the pipeline, and when the load of the diesel engine is lower, only the first-level absorption liquid spray nozzle 10 can be opened; the pipe diameter of the lower washing pipe (namely the second-stage washing pipe 2) is larger, 3 spray heads are arranged in the pipe, and when the load of the diesel engine is larger, the second-stage absorption liquid spray head 11 is opened, or the two-stage spray heads are opened simultaneously. The second-level washing pipe 2 is mostly inserted into the shell of the absorption liquid storage tank 3. The cleaned purified gas flows out from the bottom of the second-stage cleaning pipe 2 and then flows upwards continuously, water mist and foam are removed through the demister 12, and the purified gas is discharged through the purified gas outlet 13. The upper part of the absorption liquid storage tank 3 is a separation area, and the lower part is a liquid collection area. The separated liquid is recycled and sent to the first-stage absorption liquid spray head 10 and/or the second-stage absorption liquid spray head 11 by the circulating pump 4. Supplementing process water through a process water pipeline 17 according to a signal of a liquid level meter 15 of the absorption liquid storage tank 3 in the system operation process; supplementing alkali liquor according to a PH meter signal; when the density of the circulating liquid reaches a set value, a part of the circulating liquid is discharged to the wastewater treatment system through the sewage line 18. Instruments such as a PH meter 14, a liquid level meter 15, a pressure gauge 16 and the like are arranged on the absorption liquid storage tank 3 to monitor parameters such as PH value, pressure, liquid level and the like so as to maintain efficient and stable operation of the system.
After the marine diesel engine waste gas foam washing, cooling, dedusting and desulfurizing integrated device based on the sodium-alkali method is applied, the efficiency of removing submicron particles can reach more than 97 percent, the desulfurization efficiency can reach more than 98 percent, and the entrainment concentration of outlet liquid foam is less than 30mg/m3The pressure drop is less than 1000 Pa.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.

Claims (10)

1. The utility model provides a marine diesel engine waste gas foam washing cooling dust removal desulfurization integrated device, its characterized in that, includes washing pipe, absorption liquid storage tank and absorption liquid circulation pipeline, washing pipe top import as waste gas, the bottom stretches into in the absorption liquid storage tank, from the top down has arranged quench liquid shower nozzle and the perpendicular ascending absorption liquid shower nozzle of jet in proper order in the washing pipe, absorption liquid circulation pipeline's one end insert absorption liquid storage tank bottom, the other end is connected the absorption liquid shower nozzle.
2. The marine diesel engine exhaust gas foam washing cooling dust removal desulfurization integrated device of claim 1, characterized in that, the wash pipe constitute by the one-level wash pipe that the diameter is less and the great second grade wash union coupling of diameter, the absorption liquid shower nozzle divide into and installs one-level absorption liquid shower nozzle and second grade absorption liquid shower nozzle in one-level wash pipe and second grade wash pipe, absorption liquid circulation pipeline include that the tip connects respectively one-level absorption liquid circulation pipeline and the second grade absorption liquid circulation pipeline of one-level absorption liquid shower nozzle and second grade absorption liquid shower nozzle, install in one-level wash pipe the quench liquid shower nozzle.
3. The marine diesel engine exhaust gas foam washing, cooling, dedusting and desulfurizing integrated device according to claim 2, wherein 1-3 primary absorption liquid nozzles are arranged, and 1-6 secondary absorption liquid nozzles are arranged.
4. The marine diesel engine exhaust gas foam scrubbing, cooling, dedusting and desulfurizing integrated device according to claim 2, wherein the primary absorption liquid circulating line and the secondary absorption liquid circulating line share a circulating pump.
5. The marine diesel engine exhaust gas foam washing, cooling, dedusting and desulfurizing integrated device according to claim 2, wherein the absorption liquid circulation pipeline further comprises an absorption liquid return pipeline with two ends respectively connected with an outlet pipe of the circulation pump and the absorption liquid storage tank, and an inlet pipe of the circulation pump is connected with the absorption liquid storage tank.
6. The marine diesel engine exhaust gas foam washing, cooling, dedusting and desulfurizing integrated device according to claim 1 or 2, characterized in that 2-10 quenching liquid nozzles are arranged and uniformly distributed in a ring shape, and the spraying ports are arranged in a 45-degree downward inclination manner.
7. The marine diesel engine exhaust gas foam washing, cooling, dedusting and desulfurizing integrated device according to claim 1 or 2, wherein the diameter of the opening of the absorption liquid spray head is 20-200 mm.
8. The marine diesel engine exhaust gas foam washing, cooling, dedusting and desulfurizing integrated device according to claim 1, wherein a demister higher than the bottom end of the washing pipe is further arranged in the absorption liquid storage tank, and a purified gas outlet is further arranged at the top of the absorption liquid storage tank.
9. The marine diesel engine exhaust gas foam washing, cooling, dedusting and desulfurizing integrated device according to claim 1, wherein a liquid level meter and a pH meter are further mounted on the absorption liquid storage tank.
10. The marine diesel engine exhaust gas foam washing, cooling, dedusting and desulfurizing integrated device according to claim 1, wherein the absorption liquid storage tank is further provided with a process water pipeline for replenishing alkali liquor and water and a blowdown pipeline for periodic blowdown.
CN202010182710.6A 2020-03-16 2020-03-16 Marine diesel engine waste gas foam washing cooling dust removal desulfurization integrated device Pending CN111346479A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111841283A (en) * 2020-07-31 2020-10-30 中冶焦耐(大连)工程技术有限公司 AS tail gas washing device and method
CN112999815A (en) * 2021-03-18 2021-06-22 华东理工大学 Device and method for heat exchange washing of oil gas
CN113318547A (en) * 2021-05-18 2021-08-31 上海灿越化工科技有限公司 Method and device for removing coke powder from delayed coking quenching oil gas

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CN2435648Y (en) * 2000-07-12 2001-06-20 陈南洋 Cyclone counterspray impact washer
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111841283A (en) * 2020-07-31 2020-10-30 中冶焦耐(大连)工程技术有限公司 AS tail gas washing device and method
CN112999815A (en) * 2021-03-18 2021-06-22 华东理工大学 Device and method for heat exchange washing of oil gas
CN113318547A (en) * 2021-05-18 2021-08-31 上海灿越化工科技有限公司 Method and device for removing coke powder from delayed coking quenching oil gas

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Application publication date: 20200630