CN112250239A - Ship diesel engine waste gas washing water treatment device utilizing ship waste heat - Google Patents
Ship diesel engine waste gas washing water treatment device utilizing ship waste heat Download PDFInfo
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- CN112250239A CN112250239A CN202011212599.7A CN202011212599A CN112250239A CN 112250239 A CN112250239 A CN 112250239A CN 202011212599 A CN202011212599 A CN 202011212599A CN 112250239 A CN112250239 A CN 112250239A
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- 238000005406 washing Methods 0.000 title claims abstract description 61
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 35
- 239000002918 waste heat Substances 0.000 title claims abstract description 11
- 239000002912 waste gas Substances 0.000 title abstract description 9
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000003546 flue gas Substances 0.000 claims abstract description 38
- 238000002347 injection Methods 0.000 claims abstract description 29
- 239000007924 injection Substances 0.000 claims abstract description 29
- 239000007788 liquid Substances 0.000 claims abstract description 29
- 239000007789 gas Substances 0.000 claims abstract description 26
- 238000001914 filtration Methods 0.000 claims abstract description 25
- 239000010865 sewage Substances 0.000 claims abstract description 14
- 238000000926 separation method Methods 0.000 claims abstract description 13
- 238000004064 recycling Methods 0.000 claims abstract description 9
- 238000004065 wastewater treatment Methods 0.000 claims abstract description 8
- 230000001376 precipitating effect Effects 0.000 claims abstract description 4
- 239000012530 fluid Substances 0.000 claims description 22
- 239000003814 drug Substances 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 6
- 239000002351 wastewater Substances 0.000 abstract description 12
- 239000013505 freshwater Substances 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 3
- 230000008569 process Effects 0.000 abstract description 3
- 230000015572 biosynthetic process Effects 0.000 abstract description 2
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 239000003595 mist Substances 0.000 abstract 1
- 238000001556 precipitation Methods 0.000 description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 239000002699 waste material Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- 239000013535 sea water Substances 0.000 description 3
- 238000005200 wet scrubbing Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 241000282414 Homo sapiens Species 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000008239 natural water Substances 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000005201 scrubbing Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- 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
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/502—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific solution or suspension
-
- 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
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
-
- 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
- B01D2251/00—Reactants
- B01D2251/30—Alkali metal compounds
- B01D2251/304—Alkali metal compounds of sodium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/604—Hydroxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/01—Engine exhaust gases
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/043—Details
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/048—Purification of waste water by evaporation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/10—Treatment of water, waste water, or sewage by heating by distillation or evaporation by direct contact with a particulate solid or with a fluid, as a heat transfer medium
- C02F1/12—Spray evaporation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/16—Treatment of water, waste water, or sewage by heating by distillation or evaporation using waste heat from other processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
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- Environmental & Geological Engineering (AREA)
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- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Water Supply & Treatment (AREA)
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- Sustainable Development (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a marine diesel engine waste gas washing water treatment device utilizing marine waste heat, which comprises a flue gas washing module and a waste water treatment recycling module; the flue gas washing module comprises a heat exchange unit, a washing tower, a dosing tank, a metering pump, a chimney, a liquid-gas separation device, a fan, a flue gas heat exchanger, a two-stage filtering and precipitating cabinet, an electric heater and a sewage pump; the wastewater treatment recycling module comprises a steam ejector, an injection pump, a flash tank, a condenser, a liquid storage tank and a centrifugal pump a. The invention utilizes the ship waste heat to treat the exhaust gas washing water of the ship diesel engine, thereby reducing the energy consumption and the fresh water consumption; in the treatment process, no wastewater is discharged, and no pollution is caused to the ocean; the washing water can be recycled after being distilled and purified, and the washing water has no influence on the components of the washing liquid and does not influence the treatment of the waste gas of the marine diesel engine; the invention reduces the formation of white mist.
Description
Technical Field
The invention relates to a device for treating exhaust gas washing water of a marine diesel engine, in particular to a device for treating exhaust gas washing water of a marine diesel engine by using marine waste heat.
Background
The exhaust gas pollutants of the marine diesel engine bring great harm to the living environment and the body health of human beings. With the attention of people on environmental protection, environmental regulations become more and more stringent. Current marine exhaust gas treatment systems are largely comprised of two categories, namely dry treatment systems and wet scrubbing systems. Wet scrubbing systems are commonly used in marine exhaust gas treatment due to their good cleaning effect. Wet scrubbing systems fall into three different modes: the first seawater washing waste gas-open mode, the alkalinity of seawater is utilized to absorb SOx in waste gas, and the washed waste water is discharged into the sea after being treated; the second mode is a fresh water washing waste gas-closed mode, alkaline substances (usually NaOH) are added to react with SOx in the waste gas to generate salts, and the washing waste water after reaction is treated and then stored on a ship or directly discharged into the sea; in a closed system, the wash water is recycled so that Na in the wash water2SO4The concentration is gradually increased. When Na is present2SO4The concentration is increased to a certain extentAt this time, the efficiency of absorbing SOx is lowered, and therefore there is a problem that it is necessary to periodically draw out and discharge part of the washing water and replenish the fresh water and NaOH solution. The third is a seawater/fresh water scrubbing waste gas-mixed mode, which combines the advantages of an open mode and a closed mode and operates in the open mode and the closed mode according to different conditions. No matter which kind of mode is adopted, all can produce the washing waste water that contains multiple pollutant, if directly arrange the original marine ecosystem of harm in the natural water. The international maritime organization sets strict discharge standards for the discharge of washing wastewater from ships. At present, the washing wastewater is purified at home and abroad mainly by technologies such as coagulation-air flotation, cyclone separation, membrane separation, centrifugal separation and the like, and the technologies are that the washing water is directly discharged into the ocean after being treated. Although the wash water is treated, a portion of the particulate matter and contaminants are not removed and residual chemicals in the wash water may pose a hazard to the water environment. In addition, a large amount of white fog (containing acidic liquid drops) can be generated when high-temperature flue gas enters the washing device, and secondary pollution is caused.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to design a device for treating the exhaust gas washing water of the marine diesel engine, which can treat the exhaust gas washing water of the marine diesel engine by using the waste heat of the marine diesel engine, and can not change the components of the circulating washing liquid and discharge no waste water.
In order to achieve the purpose, the technical scheme of the invention is as follows: a ship diesel engine waste gas washing water treatment device utilizing ship waste heat comprises a flue gas washing module and a waste water treatment recycling module;
the flue gas washing module comprises a heat exchange unit, a washing tower, a dosing tank, a metering pump, a chimney, a liquid-gas separation device, a fan, a flue gas heat exchanger, a two-stage filtering and precipitating cabinet, an electric heater and a sewage pump;
the wastewater treatment recycling module comprises a steam ejector, an injection pump, a flash tank, a condenser, a liquid storage tank and a centrifugal pump a;
the heat exchange unit comprises three heat exchangers, the three heat exchangers are respectively a primary heat exchanger, a secondary heat exchanger and a tertiary heat exchanger, and the primary heat exchanger, the secondary heat exchanger and the tertiary heat exchanger are sequentially connected in series; the high-temperature flue gas pipeline is connected with the washing tower after passing through the primary heat exchanger, the secondary heat exchanger and the tertiary heat exchanger; heat exchange tube inlets of the first-stage heat exchanger, the second-stage heat exchanger and the third-stage heat exchanger are connected with an outlet of the centrifugal pump a, and heat exchange tube outlets of the first-stage heat exchanger, the second-stage heat exchanger and the third-stage heat exchanger are respectively connected with a working fluid inlet of the steam ejector b, a working fluid inlet of the steam ejector a and an injection fluid inlet of the steam ejector a;
the inlet of the flue gas heat exchanger is connected with the outlet of the steam ejector a, the outlet of the flue gas heat exchanger is connected with the inlet of the dosing box through a centrifugal pump b, the inlet of a heat exchange tube of the flue gas heat exchanger is connected with the outlet of the upper part of the chimney, and the outlet of the heat exchange tube of the flue gas heat exchanger is connected with the exhaust pipe;
the washing tower is a wet washing tower, a spraying inlet at the upper part of the washing tower is connected with an outlet of the metering pump, and an outlet of the washing tower is respectively connected with an inlet of the two-stage filtering and settling cabinet and an inlet of the chimney; an outlet at the lower part of the chimney is connected with an inlet of the two-stage filtering and settling cabinet;
the liquid-gas separation device is arranged at the upper part of the chimney;
the fan is arranged at an outlet at the upper part of the chimney;
the outlet of the two-stage filtering and settling cabinet is connected with the inlet of a sewage pump;
the electric heater is arranged in the two-stage filtering sedimentation cabinet;
the outlet of the sewage pump is respectively connected with the working fluid inlet of the jet pump and the top inlet of the flash tank;
the bottom outlet of the flash tank is connected with a liquid injection inlet of the injection pump, and the top outlet of the flash tank is connected with an injection inlet of the steam injector b;
the gas injection inlet of the injection pump is connected with the liquid storage tank, and the outlet of the injection pump is connected with the two-stage filtering and settling cabinet;
the outlet of the steam ejector a is connected with the inlet of the condenser through a pipeline;
an inlet at the top of the liquid storage tank is connected with an outlet of the condenser, and an outlet of the liquid storage tank is connected with an inlet of the centrifugal pump a;
and a dosing port is arranged at the top of the dosing box, and an outlet of the dosing box is connected with an inlet of the metering pump.
Further, the vapor pressure of the working fluid of the vapor ejector a is lower than that of the working fluid of the vapor ejector b; the ratio of the ejector throat area of the steam ejector a to the nozzle throat area is 10-50; the ratio of the ejector throat area of the steam ejector b to the nozzle throat area is 50-150.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention utilizes the ship waste heat to treat the exhaust gas washing water of the ship diesel engine, thereby reducing the energy consumption and the fresh water consumption;
2. in the treatment process, no wastewater is discharged, and no pollution is caused to the ocean;
3. according to the invention, the washing water can be recycled after being distilled and purified, and the washing water has no influence on the components of the washing liquid and does not influence the treatment of the exhaust gas of the marine diesel engine;
4. the invention makes full use of the waste heat of the ship, fully cools the waste gas before entering the washing tower and reduces the formation of white fog.
Drawings
FIG. 1 is a schematic composition diagram of the present invention.
In the figure: 1. the system comprises a first-stage heat exchanger, a second-stage heat exchanger, a third-stage heat exchanger, a steam ejector a, a steam ejector 5, a flue gas heat exchanger, a washing tower 6, a chimney 7, a chimney 8, a liquid-gas separation device, a fan 9, a fan 10, a dosing tank 11, a metering pump 12, a two-stage filtering and settling cabinet 13, an electric heater 14, a sewage pump 15, an injection pump 16, a flash tank 17, a steam ejector b, a steam ejector 18, a condenser 19, a liquid storage tank 20, a centrifugal pump a, a centrifugal pump 21 and a centrifugal pump b.
Detailed Description
The invention is explained in more detail below with reference to the figures and examples. As shown in fig. 1, a marine diesel engine exhaust gas washing water treatment device using marine waste heat comprises a flue gas washing module and a wastewater treatment recycling module;
the flue gas washing module comprises a heat exchange unit, a washing tower 6, a dosing tank 10, a metering pump 11, a chimney 7, a liquid-gas separation device 8, a fan 9, a flue gas heat exchanger 5, a two-stage filtering and settling tank 12, an electric heater 13 and a sewage pump 14;
the wastewater treatment recycling module comprises a steam ejector, an injection pump 15, a flash tank 16, a condenser 18, a liquid storage tank 19 and a centrifugal pump a 20;
the heat exchange unit comprises three heat exchangers, the three heat exchangers are respectively a primary heat exchanger 1, a secondary heat exchanger 2 and a tertiary heat exchanger 3, and the primary heat exchanger 1, the secondary heat exchanger 2 and the tertiary heat exchanger 3 are sequentially connected in series; the high-temperature flue gas pipeline is connected with a washing tower 6 after passing through a primary heat exchanger 1, a secondary heat exchanger 2 and a tertiary heat exchanger 3; the inlets of heat exchange tubes of the first-stage heat exchanger 1, the second-stage heat exchanger 2 and the third-stage heat exchanger 3 are respectively connected with the outlet of a centrifugal pump a20, and the outlets of the heat exchange tubes of the first-stage heat exchanger 1, the second-stage heat exchanger 2 and the third-stage heat exchanger 3 are respectively connected with a working fluid inlet of a steam ejector b17, a working fluid inlet of a steam ejector a4 and an injection fluid inlet of a steam ejector a 4;
the inlet of the flue gas heat exchanger 5 is connected with the outlet of a steam ejector a4, the outlet of the flue gas heat exchanger is connected with the inlet of the dosing box 10 through a centrifugal pump b21, the inlet of a heat exchange tube of the flue gas heat exchanger 5 is connected with the outlet of the upper part of a chimney 7, and the outlet of the heat exchange tube is connected with an exhaust pipe;
the washing tower 6 is a wet washing tower 6, a spraying inlet at the upper part is connected with an outlet of a metering pump 11, and an outlet is respectively connected with an inlet of a two-stage filtering and settling cabinet 12 and an inlet of a chimney 7; an outlet at the lower part of the chimney 7 is connected with an inlet of a two-stage filtering and settling cabinet 12;
the liquid-gas separation device 8 is arranged at the upper part of the chimney 7;
the fan 9 is arranged at an outlet at the upper part of the chimney 7;
the outlet of the two-stage filtering and settling cabinet 12 is connected with the inlet of a sewage pump 14;
the electric heater 13 is arranged in the two-stage filtering and settling cabinet 12;
the outlet of the sewage pump 14 is respectively connected with the working fluid inlet of the jet pump 15 and the top inlet of the flash tank 16;
the bottom outlet of the flash tank 16 is connected with a liquid injection inlet of the injection pump 15, and the top outlet of the flash tank is connected with an injection inlet of the steam injector b 17;
the gas injection inlet of the injection pump 15 is connected with the liquid storage tank 19, and the outlet of the injection pump is connected with the two-stage filtering and settling cabinet 12;
the outlet of the steam ejector a is connected with the inlet of the condenser 18 through a pipeline;
the inlet at the top of the liquid storage tank 19 is connected with the outlet of the condenser 18, and the outlet is connected with the inlet of a centrifugal pump a 20;
the top of the medicine dispensing box 10 is provided with a medicine adding port, and the outlet of the medicine dispensing box 10 is connected with the inlet of the metering pump 11.
Further, the working fluid vapor pressure of the vapor injector a4 is lower than that of the vapor injector b 17; the ratio of the ejector throat area of the steam ejector a4 to the nozzle throat area is 10-50; the ratio of the ejector throat area to the nozzle throat area of the steam ejector b17 is 50-150.
The working process of the invention is as follows:
during operation, high-temperature flue gas is subjected to continuous tertiary heat exchange and cooling in the primary heat exchanger 1, the secondary heat exchanger 2 and the tertiary heat exchanger 3, and the low-temperature flue gas subjected to heat exchange and cooling enters the washing tower 6. The flue gas is treated by multilevel filling, spraying and spraying in the washing tower 6, and is fully contacted and reacted with the spraying liquid to form a solid-liquid mixture which enters the two-stage filtering and precipitating cabinet 12 through a pipeline. The treated flue gas is exhausted to the flue gas heat exchanger 5 through the chimney 7 by the liquid-gas separation device 8 under the suction action of the fan 9, and the treated flue gas and the flue gas discharged from the steam ejector a4 continuously exchange heat. The water separated by the liquid-gas separation device 8 can be discharged to a first grid settling tank of the two-stage filtering settling tank 12 through a pipeline. The solid-liquid mixture formed after the flue gas washing is firstly precipitated in the first-grid precipitation cabinet of the two-stage filtration precipitation cabinet 12, and the wastewater overflows to the second-grid precipitation cabinet after being gradually full. First check deposit and be equipped with the filter screen between the cabinet and the second check deposit the cabinet, can deposit the waste water that the cabinet spilled over to first check and filter. The second check deposits the cabinet and spills over to the third check after gradually being full again and deposits the cabinet, and the second check deposits and is equipped with filter equipment between cabinet and the third check deposit the cabinet, can filter the tiny granule in the waste liquid. The electric heater 13 in the secondary precipitation filter cabinet 12 can heat, evaporate and scale the water which is not drained completely from the precipitation cabinet when the dirt is treated. The water vapor of about 170 ℃ heated and evaporated by the first-stage heat exchanger 1 enters the working fluid inlet of the steam ejector b, so that the steam ejector b is driven to work, the flash tank 19 is vacuumized to reduce the pressure in the tank, the wastewater in the third precipitation cabinet in the two-stage filtration precipitation cabinet 12 is pumped to the top of the flash tank 16 by the sewage pump 14 to be sprayed out, the wastewater is rapidly vaporized to form water vapor due to the fact that the temperature of the water vapor is higher than the saturation temperature corresponding to the pressure in the tank after the water vapor is formed, and the water vapor is sucked by the steam ejector b17 and mixed with high-temperature steam. The mixed fluid enters a condenser 18 to be condensed to form water, and the water enters a liquid storage tank 19 to be stored. Meanwhile, the other path of sewage from the sewage pump 14 is used as working fluid to drive the injection pump 15 to vacuumize the liquid storage tank 19 and inject the concentrated solution in the flash tank 16, and the injected mixed solution enters a first grid precipitation cabinet of the two-stage filtration precipitation cabinet for recycling, precipitation and distillation. The water in the liquid storage tank 19 passes through the centrifugal pump and then reaches the heat exchange tubes of the first-stage heat exchanger 1, the second-stage heat exchanger 2 and the third-stage heat exchanger 3 through pipelines. The steam is changed into the working fluid of the steam ejector a after the heat exchange of the secondary heat exchanger 2, the steam is formed as the injection fluid of the steam ejector a after the heat exchange of the secondary heat exchanger and the tertiary heat exchanger, and the steam and the injection fluid are mixed in the throat pipe and then are transferred to the flue gas heat exchanger through the pipeline to exchange heat with the treated flue gas. After sufficient heat exchange, the steam is condensed into water which is sent to the dispensing box 10 through a centrifugal pump b 21. The dosing box 10 can be added with alkaline solution at the top to form washing liquid for washing waste gas, and the washing liquid is sprayed from the top of the washing tower 7 under the pressurization of the metering pump 11 to wash flue gas.
Although specific embodiments of the present invention have been described above, it will be appreciated by those skilled in the art that these are merely illustrative and that various changes and modifications may be made in the embodiments of the invention without departing from the principles and spirit of the invention.
Claims (2)
1. The utility model provides a marine diesel engine exhaust gas washing water treatment facilities who utilizes boats and ships waste heat which characterized in that: comprises a flue gas washing module and a wastewater treatment recycling module;
the flue gas washing module comprises a heat exchange unit, a washing tower (6), a dosing tank (10), a metering pump (11), a chimney (7), a liquid-gas separation device (8), a fan (9), a flue gas heat exchanger (5), a two-stage filtering and precipitating tank (12), an electric heater (13) and a sewage pump (14);
the wastewater treatment recycling module comprises a steam ejector, an injection pump (15), a flash tank (16), a condenser (18), a liquid storage tank (19) and a centrifugal pump a (20);
the heat exchange unit comprises three heat exchangers, the three heat exchangers are respectively a primary heat exchanger (1), a secondary heat exchanger (2) and a tertiary heat exchanger (3), and the primary heat exchanger (1), the secondary heat exchanger (2) and the tertiary heat exchanger (3) are sequentially connected in series; the high-temperature flue gas pipeline is connected with a washing tower (6) after passing through a primary heat exchanger (1), a secondary heat exchanger (2) and a tertiary heat exchanger (3); heat exchange tube inlets of the first-stage heat exchanger (1), the second-stage heat exchanger (2) and the third-stage heat exchanger (3) are all connected with an outlet of a centrifugal pump a (20), and heat exchange tube outlets of the first-stage heat exchanger (1), the second-stage heat exchanger (2) and the third-stage heat exchanger (3) are respectively connected with a working fluid inlet of a steam ejector b (17), a working fluid inlet of a steam ejector a (4) and an injection fluid inlet of the steam ejector a (4);
an inlet of the flue gas heat exchanger (5) is connected with an outlet of the steam ejector a (4), an outlet of the flue gas heat exchanger is connected with an inlet of the dosing box (10) through a centrifugal pump b (21), an inlet of a heat exchange pipe of the flue gas heat exchanger (5) is connected with an outlet at the upper part of the chimney (7), and an outlet of the heat exchange pipe is connected with the exhaust pipe;
the washing tower (6) is a wet washing tower (6), an upper spraying inlet is connected with an outlet of the metering pump (11), and an outlet is respectively connected with an inlet of the two-stage filtering and settling cabinet (12) and an inlet of the chimney (7); an outlet at the lower part of the chimney (7) is connected with an inlet of the two-stage filtering and settling cabinet (12);
the liquid-gas separation device (8) is arranged at the upper part of the chimney (7);
the fan (9) is arranged at an outlet at the upper part of the chimney (7);
the outlet of the two-stage filtering and settling cabinet (12) is connected with the inlet of a sewage pump (14);
the electric heater (13) is arranged in the two-stage filtering and settling cabinet (12);
the outlet of the sewage pump (14) is respectively connected with the working fluid inlet of the jet pump (15) and the top inlet of the flash tank (16);
the bottom outlet of the flash tank (16) is connected with a liquid injection inlet of an injection pump (15), and the top outlet of the flash tank is connected with an injection inlet of a steam injector b (17);
the gas injection inlet of the injection pump (15) is connected with the liquid storage tank (19), and the outlet of the injection pump is connected with the two-stage filtering and settling cabinet (12);
the outlet of the steam ejector a is connected with the inlet of a condenser (18) through a pipeline;
an inlet at the top of the liquid storage tank (19) is connected with an outlet of the condenser (18), and an outlet of the liquid storage tank is connected with an inlet of the centrifugal pump a (20);
the top of the medicine dispensing box (10) is provided with a medicine adding port, and the outlet of the medicine dispensing box (10) is connected with the inlet of the metering pump (11).
2. The marine diesel engine exhaust gas washing water treatment device using the marine residual heat according to claim 1, characterized in that: the working fluid vapor pressure of the steam ejector a (4) is lower than that of the steam ejector b (17); the ratio of the ejector throat area of the steam ejector a (4) to the nozzle throat area is 10-50; the ratio of the ejector throat area of the steam ejector b (17) to the nozzle throat area is 50-150.
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN114835302A (en) * | 2022-06-01 | 2022-08-02 | 中船动力研究院有限公司 | Ship exhaust gas recirculation wastewater treatment system and ship |
CN116253390A (en) * | 2023-02-09 | 2023-06-13 | 中国船舶重工集团柴油机有限公司 | System and method for evaporating concentrated water by using waste heat of ship engine exhaust gas |
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CN106746136A (en) * | 2017-03-29 | 2017-05-31 | 广州新普利节能环保科技有限公司 | The technique of zero discharge and system of a kind of desulfurization wastewater |
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CN213569983U (en) * | 2020-11-03 | 2021-06-29 | 大连海事大学 | Ship diesel engine waste gas washing water treatment device utilizing ship waste heat |
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CN1599637A (en) * | 2001-12-05 | 2005-03-23 | 斯奈克玛动力部件公司 | Method and installation for treating flue gas containing hydrocarbons |
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CN114835302A (en) * | 2022-06-01 | 2022-08-02 | 中船动力研究院有限公司 | Ship exhaust gas recirculation wastewater treatment system and ship |
CN116253390A (en) * | 2023-02-09 | 2023-06-13 | 中国船舶重工集团柴油机有限公司 | System and method for evaporating concentrated water by using waste heat of ship engine exhaust gas |
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