Integrated Ship Exhaust Gas Treatment System and Ship

Abstract

The present invention provides a comprehensive treatment system for ship exhaust, including a seawater inlet pipeline, a seawater pump, an electrolysis unit, an absorption tower, a seawater outlet pipeline, a washing liquid buffer tank, a washing liquid supply pump, a booster pump, a desorption tower, a flue gas pipeline and a CO2 storage tank; the absorption tower includes an oxidation pre-washing section and a chemical absorption section that are interconnected, and a packing layer is provided in the chemical absorption section; the desorption tower includes a heating section and a desorption section that are sequentially arranged from bottom to top, and an ultrasonic generator is provided on the desorption section. The washing liquid entering the desorption tower can be heated in the heating section before entering the desorption section and releasing CO2. The present invention can simultaneously achieve the treatment of NO in the exhaust gas. X and SO X The invention can process the CO2 in the tail gas and recycle the CO2, and occupies a small space, which can meet the requirements of compact installation in ship space. The invention also provides a ship.

Description

Technical Field

[0001] The present invention relates to the technical field of ship exhaust gas treatment, and in particular to a ship exhaust gas comprehensive treatment system and a ship. Background Art

[0002] In the world's cargo transportation, ocean transportation is highly favored due to its advantages such as large transportation volume, safety and economy. As a result, the number of ocean-going ships has increased dramatically, which has led to serious air and ocean pollution. According to statistics, NO2 caused by ships is X 、SO X The global anthropogenic NO emissions account for X 、SO X 15% and 5% of the total emissions, and this figure is increasing year by year. X and SO X The emission of harmful substances from ships seriously affects the ecological environment and people's health. To this end, the International Maritime Organization has formulated a series of anti-pollution conventions (such as the MARPOL Convention) to limit the emission of harmful components in ship exhaust.

[0003] MARPOL Annex VI for ships X 、SO X The emission standards for NOx are clearly defined. Currently, the global sulfur content in fuel oil is limited to 0.5%. For ships sailing in SOx emission control areas, the 0.1% emission standard will be implemented from January 1, 2015. Annex VI of MARPOL Convention 73 / 78 has set a new emission standard for NOx. X The emissions of low-speed engines (n<130r / min), medium-speed engines (130r / min≤n<2000r / min), and high-speed engines (n≥2000r / min) are restricted in three stages: after January 1, 2011, the nitrogen oxide emissions of ships must comply with the Tier II standard; after January 1, 2016, the nitrogen oxide emissions of new ships sailing in the control area (ECA area) must meet the more stringent Tier III standard.

[0004] According to the data in the third greenhouse gas study published by the International Maritime Organization (IMO) in 2014, the global shipping industry's average annual carbon dioxide emissions reached 10.15 million tons between 2007 and 2012, accounting for 3.1% of the world's total carbon dioxide emissions. IMO estimates that if no effective emission reduction measures are taken, by 2050, the total greenhouse gas emissions of the global shipping industry may increase by 50%-250% based on the 2012 emission level. In April 2018, the 72nd meeting of the MEPC formally discussed and adopted the preliminary strategy for reducing greenhouse gas emissions from ships (MEPC.304(72)). The preliminary strategy clarified the guiding principles for the implementation of greenhouse gas emissions control from ships:

[0005] First, by further implementing the Energy Efficiency Design Index (EEDI) for new shipbuilding, and proposing phased strengthening of energy efficiency design requirements based on actual conditions and ship types, we can promote the reduction of carbon emission intensity of ships;

[0006] Second, it requires that by 2030, global average CO2 emissions per unit of transport activity be reduced by at least 40% compared to 2008, and efforts should be made to reduce it by 70% by 2050;

[0007] Third, greenhouse gas emissions from international shipping should peak and begin to decline as soon as possible, with the goal of reducing the total annual greenhouse gas emissions from ships by at least 50% by 2050 compared to 2008. At the same time, efforts should be made to achieve the vision of gradually eliminating greenhouse gas emissions from maritime vessels through an emission reduction path that is consistent with the temperature control targets of the Paris Agreement.

[0008] At present, ship exhaust NO X The treatment mainly adopts Selective Catalytic Reduction (SCR) and Exhaust Gas Recirculation (EGR). X Treatment can be roughly divided into two categories: dry scrubbing desulfurization and wet scrubbing desulfurization. Based on the specific conditions of ships, wet desulfurization technology is often used, mainly including: open loop scrubbing system (Open Loop), closed loop scrubbing system (Closed Loop) and composite desulfurization system (Hybrid).

[0009] It is not difficult to see from the development dynamics of the International Maritime Organization that the emission restrictions on ship exhaust are not only aimed at SO X and NO X , as well as other pollutants such as greenhouse gases and particulate matter. Currently, greenhouse gas emission reduction measures for ships mainly consider CO2 emission reduction from front-end control measures such as improving the Ship Energy Efficiency Design Index (EEDI) of new ships, implementing the "Ship Energy Efficiency Management Plan" (SEEMP) for operating ships, and developing alternative energy sources. Few studies have actually been conducted from the perspective of post-treatment. However, according to the current IMO forecast trend, it will be difficult to achieve the required carbon emission standards within the expected timeframe by relying solely on front-end control measures. The simple superposition of a single exhaust gas treatment method will inevitably increase the size and initial investment of the entire device, which is obviously not suitable for ships and ship owners. Summary of the Invention

[0010] The purpose of this invention is to provide a comprehensive treatment system for ship exhaust gas, which can simultaneously achieve the treatment of NO X and SO XIt can not only process the CO2 in the exhaust gas, but also recycle and utilize the CO2 in the exhaust gas. It also occupies a small space and can meet the requirements of compact installation in ship space.

[0011] The present invention provides a comprehensive ship exhaust treatment system, comprising a seawater inlet pipeline, a seawater pump, an electrolysis unit, an absorption tower, a seawater outlet pipeline, a washing liquid buffer tank, a washing liquid supply pump, a booster pump, a desorption tower, a flue gas pipeline and a CO2 storage bin;

[0012] The absorption tower comprises an oxidation pre-washing section and a chemical absorption section which are interconnected, wherein a filler layer is provided in the chemical absorption section;

[0013] The desorption tower comprises a heating section and a desorption section arranged in sequence from bottom to top, and the desorption section is provided with an ultrasonic generator, so that the washing liquid entering the desorption tower can be heated in the heating section before entering the desorption section and releasing CO2;

[0014] The seawater inlet pipeline is communicated with the inlet of the seawater pump, the outlet of the seawater pump is communicated with the inlet of the electrolysis unit, the outlet of the electrolysis unit is communicated with the seawater inlet of the oxidation pre-washing section, and the seawater outlet of the oxidation pre-washing section is communicated with the seawater outlet pipeline; the bottom outlet of the chemical absorption section is communicated with the inlet of the washing liquid buffer tank, and the outlet of the washing liquid buffer tank is divided into two paths, one path is communicated with the inlet of the washing liquid supply pump, and the outlet of the washing liquid supply pump is communicated with the inlet of the chemical absorption section, and the other path is communicated with the inlet of the booster pump, and the outlet of the booster pump is communicated with the washing liquid inlet of the heating section, the washing liquid outlet of the desorption section is communicated with the inlet of the washing liquid buffer tank, and the CO2 outlet of the desorption section is communicated with the inlet of the CO2 storage bin;

[0015] The flue gas pipeline is communicated with the flue gas inlet of the heating section, and the flue gas outlet of the heating section is communicated with the flue gas inlet of the oxidation pre-washing section.

[0016] Furthermore, a water treatment unit is provided on the pipeline between the outlet of the washing liquid buffer tank and the inlet of the booster pump, and the water treatment unit is used to remove impurities in the washing liquid.

[0017] Furthermore, the ship exhaust comprehensive treatment system also includes a condensate return pipeline, a condenser is provided on the pipeline between the CO2 outlet of the desorption section and the inlet of the CO2 storage bin, and the bottom outlet of the CO2 storage bin is connected to the desorption section through the condensate return pipeline.

[0018] Furthermore, the ship exhaust comprehensive treatment system also includes an absorbent storage cabinet and an absorbent replenishing pump, the outlet of the absorbent storage cabinet is connected to the inlet of the absorbent replenishing pump, and the outlet of the absorbent replenishing pump is connected to the inlet of the washing liquid buffer tank.

[0019] Furthermore, the heating section and the desorption section are separated by a partition, a washing liquid pipeline is provided in the desorption tower, the bottom end of the washing liquid pipeline is located in the heating section, the top end of the washing liquid pipeline passes through the partition and extends into the desorption section, and the outlet of the booster pump is connected to the bottom end of the washing liquid pipeline.

[0020] Furthermore, a first spray layer is provided in the desorption section, and the first spray layer is connected to the top end of the washing liquid pipeline.

[0021] Furthermore, the washing liquid pipeline includes a first pipe section located in the heating section and a second pipe section located in the desorption section, and the first pipe section is a bent structure.

[0022] Furthermore, a second spray layer is provided in the chemical absorption section, the second spray layer is located above the packing layer, and the outlet of the washing liquid supply pump is connected to the second spray layer.

[0023] Furthermore, a third spray layer is provided in the oxidation pre-wash section, and the outlet of the electrolysis unit is connected to the third spray layer.

[0024] Furthermore, the absorption tower also includes a connecting section, one end of which is connected to the oxidation pre-wash section, and the other end of which is connected to the chemical absorption section, and the connecting position between the connecting section and the chemical absorption section is located below the packing layer.

[0025] Furthermore, the connecting section is arranged at an angle, and the height of the connecting section close to one end of the chemical absorption section is greater than the height of the connecting section close to one end of the oxidation pre-washing section.

[0026] The present invention also provides a ship, comprising the above-mentioned ship exhaust comprehensive treatment system.

[0027] The integrated ship exhaust gas treatment system provided by the present invention utilizes electrolysis technology to electrolyze seawater to obtain modified seawater with strong oxidizing and alkalinity. The electrolyzed seawater is used to preliminarily wash the ship exhaust gas in the oxidation pre-wash section of the absorption tower. The electrolyzed seawater oxidizes the insoluble NO in the exhaust gas into soluble NO2 gas, and absorbs and removes NOx and SO in the exhaust gas. X , while reducing the exhaust temperature; the ship exhaust gas after pre-washing is in countercurrent contact with the chemical absorbent in the chemical absorption section of the absorption tower, thereby washing and removing CO2 and remaining NOx and SO in the exhaust gas XOne or more weakly linked intermediate compounds are dissolved in the washing rich liquid after absorbing CO2. The washing rich liquid enters the heating section of the desorption tower and is heated by heat exchange with the high-temperature exhaust gas. Then, it is desorbed in the desorption section of the desorption tower through high-temperature-ultrasonic coupling to generate a gas phase product with a high CO2 concentration for storage or use by ships, thereby realizing the recovery and utilization of CO2. At the same time, the absorption capacity of the absorbent is regenerated and can be recycled. This ship exhaust comprehensive treatment system can simultaneously achieve the treatment of NO in the exhaust gas. X and SO X It can not only process the CO2 in the exhaust gas, but also recycle and utilize the CO2 in the exhaust gas. It also occupies a small space and can meet the requirements of compact installation in ship space. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Schematic diagram of the structure of the comprehensive treatment system for ship exhaust gas in an embodiment of the present invention. DETAILED DESCRIPTION

[0029] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0030] The terms "first," "second," "third," "fourth," and the like (if any) in the description and claims of the present invention are used to distinguish similar objects and are not necessarily used to describe a particular sequential order or sequence.

[0031] like Figure 1 As shown, the integrated exhaust gas treatment system for ships provided by the embodiment of the present invention includes a seawater inlet pipeline 1, a seawater pump 2, an electrolysis unit 3, an absorption tower 4, a seawater outlet pipeline 5, a washing liquid buffer tank 6, a washing liquid supply pump 7, a booster pump 8, a desorption tower 9, a flue gas pipeline 10 and a CO2 storage tank 11;

[0032] The absorption tower 4 includes an oxidation pre-washing section 41 and a chemical absorption section 42 which are interconnected. A packing layer 421 is provided in the chemical absorption section 42.

[0033] The desorption tower 9 includes a heating section 91 and a desorption section 92 arranged in sequence from bottom to top. The desorption section 92 is provided with an ultrasonic generator 921. The scrubbing liquid entering the desorption tower 9 can be heated in the heating section 91 before entering the desorption section 92 and releasing CO2.

[0034] The seawater inlet pipeline 1 is connected to the inlet of the seawater pump 2, the outlet of the seawater pump 2 is connected to the inlet of the electrolysis unit 3, the outlet of the electrolysis unit 3 is connected to the seawater inlet of the oxidation pre-wash section 41, and the seawater outlet of the oxidation pre-wash section 41 is connected to the seawater outlet pipeline 5; the bottom outlet of the chemical absorption section 42 is connected to the inlet of the washing liquid buffer tank 6, and the outlet of the washing liquid buffer tank 6 is divided into two paths, one path is connected to the inlet of the washing liquid supply pump 7, and the outlet of the washing liquid supply pump 7 is connected to the inlet of the chemical absorption section 42 (the connection position of the washing liquid supply pump 7 and the chemical absorption section 42 is located above the packing layer 421), and the other path is connected to the inlet of the booster pump 8, and the outlet of the booster pump 8 is connected to the washing liquid inlet of the heating section 91, the washing liquid outlet of the desorption section 92 is connected to the inlet of the washing liquid buffer tank 6, and the CO2 outlet of the desorption section 92 is connected to the inlet of the CO2 storage warehouse 11;

[0035] The flue gas pipeline 10 is connected to the flue gas inlet of the heating section 91 , and the flue gas outlet of the heating section 91 is connected to the flue gas inlet of the oxidation pre-washing section 41 .

[0036] Specifically, this embodiment uses electrolysis technology (electrolysis unit 3) to electrolyze seawater to obtain modified seawater with strong oxidizing and alkalinity. The electrolyzed seawater is used to preliminarily wash the ship's exhaust gas in the oxidation pre-wash section 41 of the absorption tower 4. The electrolyzed seawater oxidizes the insoluble NO in the exhaust gas into soluble NO2 gas and absorbs and removes NOx and SO in the exhaust gas. X , while reducing the exhaust temperature; the ship exhaust gas after pre-washing is in countercurrent contact with the chemical absorbent in the chemical absorption section 42 of the absorption tower 4, thereby washing and removing CO2 and remaining NOx and SO in the exhaust gas X One or more weakly linked intermediate compounds are dissolved in the washing rich liquid after absorbing CO2. The washing rich liquid enters the heating section 91 of the desorption tower 9 and is heated by heat exchange with the high-temperature exhaust gas. Then, it is desorbed in the desorption section 92 of the desorption tower 9 through high-temperature-ultrasonic coupling to generate a gas phase product with a high CO2 concentration for storage or use by ships, thereby realizing the recovery and utilization of CO2. At the same time, the absorption capacity of the absorbent is regenerated and can be recycled. This ship exhaust comprehensive treatment system can not only achieve the simultaneous treatment of NO in the exhaust gas, but also the recovery and utilization of CO2. X and SO X It can not only process the CO2 in the exhaust gas, but also recycle and utilize the CO2 in the exhaust gas. It also occupies a small space and can meet the requirements of compact installation in ship space.

[0037] Furthermore, if Figure 1 As shown, in this embodiment, a water treatment unit 12 is provided on the pipeline between the outlet of the washing liquid buffer tank 6 and the inlet of the booster pump 8. The water treatment unit 12 is used to separate and remove impurities such as smoke, particulate matter, oil and precipitation mixed in the washing liquid, thereby preventing impurities from clogging the system.

[0038] Further, if Figure 1 As shown, in this embodiment, the ship exhaust gas comprehensive treatment system also includes a condensate return pipeline 13, and a condenser 14 is provided on the pipeline between the CO2 outlet of the desorption section 92 and the inlet of the CO2 storage tank 11, and the bottom outlet of the CO2 storage tank 11 is connected to the desorption section 92 through the condensate return pipeline 13.

[0039] Specifically, the condenser 14 is used to condense and separate the water contained in the CO2 discharged from the desorption section 92 to obtain purer CO2. The separated pure CO2 and water enter the CO2 storage bin 11 together. The condensed water returns to the desorption section 92 through the condensate return pipe 13. The pure CO2 is stored in the CO2 storage bin 11 for use by the ship's inert gas system or stored on shore for treatment.

[0040] Further, if Figure 1 As shown, in this embodiment, the ship exhaust comprehensive treatment system also includes an absorbent storage cabinet 15 and an absorbent replenishing pump 16, the outlet of the absorbent storage cabinet 15 is connected to the inlet of the absorbent replenishing pump 16, and the outlet of the absorbent replenishing pump 16 is connected to the inlet of the washing liquid buffer tank 6.

[0041] Specifically, absorbent storage tank 15 is used to store chemical absorbents, including but not limited to alcohol amine solutions, strong alkaline solutions, aqueous ammonia solutions, hot caustic potash solutions, and calcium-based alkaline solutions. When the absorbent in the circulating scrubbing liquid is consumed, the chemical absorbent in absorbent storage tank 15 is fed into scrubbing liquid buffer tank 6 via absorbent replenishment pump 16, thereby ensuring the system's absorption efficiency.

[0042] Further, if Figure 1 As shown, in this embodiment, the heating section 91 and the desorption section 92 are separated by a partition 93, and a washing liquid pipeline 94 is provided in the desorption tower 9. The bottom end of the washing liquid pipeline 94 is located in the heating section 91, and the top end of the washing liquid pipeline 94 passes through the partition 93 and extends into the desorption section 92. The outlet of the booster pump 8 is connected to the bottom end of the washing liquid pipeline 94.

[0043] Specifically, after entering the desorption tower 9, the scrubbing liquid in the scrubbing liquid buffer tank 6 is transported from the heating section 91 to the desorption section 92 via the scrubbing liquid pipeline 94. Once in the heating section 91, the scrubbing liquid undergoes heat exchange with the high-temperature exhaust gas generated by the ship's engine (the heating section 91 constitutes a shell-and-tube heat exchanger, with the scrubbing liquid flowing through the tube side and the high-temperature exhaust gas flowing through the shell side). This heats the scrubbing liquid and simultaneously cools the high-temperature exhaust gas. The cooled exhaust gas then enters the oxidation pre-wash section 41 of the absorption tower 4 for treatment. The heated scrubbing liquid then enters the desorption section 92 of the desorption tower 9. Under the influence of high temperature and ultrasound (the desorption section 92 is equipped with an ultrasonic generator 921, utilizing ultrasound-high-temperature coupled desorption technology to improve desorption efficiency), the scrubbing liquid desorbs and releases the absorbed CO2 gas. Simultaneously, the desorbed scrubbing liquid returns to the scrubbing liquid buffer tank 6 through the outlet at the bottom of the desorption section 92 for reuse.

[0044] Furthermore, if Figure 1 As shown, in this embodiment, a first spray layer 95 is provided in the desorption section 92, and the first spray layer 95 is connected to the top of the washing liquid pipeline 94. By providing the first spray layer 95, the washing liquid can be sprayed through the first spray layer 95, thereby accelerating the desorption and escape of CO2 gas from the washing liquid and improving the desorption efficiency.

[0045] Furthermore, if Figure 1 As shown, in this embodiment, multiple layers of first spray layers 95 are provided in the desorption section 92, thereby further improving the desorption efficiency.

[0046] Furthermore, if Figure 1 As shown, in this embodiment, the washing liquid pipeline 94 includes a first pipe section 941 located in the heating section 91 and a second pipe section 942 located in the desorption section 92. The first pipe section 941 is a bent structure, and the second pipe section 942 is a straight pipe structure.

[0047] Specifically, the first pipe section 941 can be bent into an S-shaped, spiral or other structure to increase the heat exchange area and heat exchange time between the washing liquid and the high-temperature exhaust gas in the heating section 91, thereby improving the heat exchange efficiency and further improving the desorption efficiency.

[0048] Furthermore, if Figure 1 As shown, in this embodiment, a second spray layer 422 is provided within the chemical absorption section 42. The second spray layer 422 is located above the packing layer 421, and the outlet of the scrubbing liquid supply pump 7 is connected to the second spray layer 422. A third spray layer 411 is provided within the oxidation pre-wash section 41, and the outlet of the electrolysis unit 3 is connected to the third spray layer 411. The provision of the second spray layer 422 and the third spray layer 411 increases the contact area between the exhaust gas and the absorbent / seawater, thereby improving the absorption effect.

[0049] Furthermore, if Figure 1 As shown, in this embodiment, the first spray layer 95, the second spray layer 422 and the third spray layer 411 are each provided with a plurality of nozzles.

[0050] Furthermore, if Figure 1 As shown, in this embodiment, the absorption tower 4 also includes a connecting section 43, one end of the connecting section 43 is connected to the oxidation pre-wash section 41, and the other end of the connecting section 43 is connected to the chemical absorption section 42, and the connecting position between the connecting section 43 and the chemical absorption section 42 is located below the packing layer 421.

[0051] Furthermore, if Figure 1 As shown, in this embodiment, the connecting section 43 is arranged at an angle, and the height of the connecting section 43 near the chemical absorption section 42 is greater than the height of the connecting section 43 near the oxidation pre-washing section 41, thereby facilitating the smooth entry of exhaust gas from the oxidation pre-washing section 41 into the chemical absorption section 42.

[0052] Of course, valves are also provided on each pipeline in the ship's exhaust gas comprehensive treatment system, which will not be described in detail here.

[0053] An embodiment of the present invention further provides a ship, comprising the above-mentioned ship exhaust comprehensive treatment system.

[0054] The workflow of the ship exhaust comprehensive treatment system of this embodiment is as follows:

[0055] 1. Seawater is pumped from the seawater inlet pipe 1 to the electrolysis unit 3 after being pressurized by the seawater pump 2. The seawater undergoes electrolysis reaction in the electrolysis unit 3 to produce a seawater solution with strong oxidizing and alkalinity (electrolysis produces ClO - and OH - ), not only can the absorption capacity of seawater solution be improved, but the oxidizing substances produced in the seawater solution can also be used to oxidize the insoluble NO gas.

[0056] 2. Absorption tower 4 is used for comprehensive oxidation and absorption of NO in ship exhaust gas X 、SO X The modified seawater after electrolysis is sprayed into the oxidation pre-wash section 41 of the absorption tower 4 through the third spray layer 411, and is mixed with the exhaust gas from the ship entering the oxidation pre-wash section 41. The oxidizing substances in the spray liquid (seawater) oxidize the insoluble NO gas in the exhaust gas into soluble NO2 gas, and SO X At the same time, the exhaust gas temperature can be reduced in the oxidation pre-wash section 41, thereby improving the subsequent exhaust gas absorption efficiency. X and SO X The resulting seawater solution is discharged through the bottom outlet of the oxidation pre-washing section 41 to the seawater outlet pipeline 5.

[0057] 3. After oxidation, pre-washing, and cooling, the ship's exhaust gas enters the chemical absorption section 42 of the absorption tower 4 through the upward connecting section 43. The chemical absorption section 42 is provided with a packing layer 421. The chemical absorbent is pressurized by the washing liquid supply pump 7 from the washing liquid buffer tank 6 and then sprayed into the chemical absorption section 42 through the second spray layer 422. In the packing layer 421, it contacts the ship's exhaust gas in countercurrent flow, fully absorbing the CO2 and remaining NO in the exhaust gas. X and SO X The clean flue gas after washing is discharged through the flue at the top of the chemical absorption section 42, and the washing liquid falls into the washing liquid buffer tank 6 below for storage.

[0058] 4. The washing liquid buffer tank 6 temporarily stores the rich washing liquid generated by the absorption tower 4. A portion of the washing liquid stored in the washing liquid buffer tank 6 is returned to the absorption tower 4 via the washing liquid supply pump 7 for absorption, while the remaining portion enters the subsequent water treatment unit 12 and desorption tower 9 for regeneration. Meanwhile, the absorbent storage tank 15 stores chemical absorbent. When the absorbent in the circulating washing liquid is consumed, the chemical absorbent in the absorbent storage tank 15 is fed into the washing liquid buffer tank 6 via the absorbent replenishment pump 16, thereby ensuring the system's absorption efficiency.

[0059] 5. A portion of the scrubbing liquid in the scrubbing liquid buffer tank 6 first enters the water treatment unit 12 to separate and remove impurities such as smoke, particulate matter, oil, and sediment from the scrubbing liquid to prevent system clogging. After impurities are separated, the scrubbing liquid enters the heating section 91 of the desorption tower 9 via the booster pump 8. The heating section 91 is a heat exchanger in which the rich scrubbing liquid exchanges heat with the high-temperature flue gas generated by the ship's engine, heating the rich scrubbing liquid and simultaneously cooling the flue gas. The cooled flue gas then enters the oxidation pre-wash section 41 of the absorption tower 4 for treatment. The heated rich scrubbing liquid enters the desorption section 92 of the desorption tower 9, where it desorbs and releases the absorbed CO2 gas. The desorption section 92 is equipped with an ultrasonic generator 921, which utilizes ultrasonic-high-temperature coupled desorption technology to improve desorption efficiency.

[0060] 6. The desorbed scrubbing liquid is returned to the scrubbing liquid buffer tank 6 through the bottom outlet of the desorption section 92 for reuse. The desorbed high-concentration CO2 gas is discharged through the top outlet of the desorption section 92, condensed by the condenser 14, and then stored in the CO2 storage silo 11. It can then be used by the ship's inert gas system or stored onshore for processing. The condensed water is returned to the desorption section 92 through the condensate return line 13.

[0061] The ship exhaust comprehensive treatment system provided by the embodiment of the present invention meets the requirements of compact installation space of all ships and can achieve NO X and SO XIt can effectively remove CO2 and realize the regeneration cycle of absorbent, reduce absorbent consumption, and the CO2-enriched gas produced by desorption can be stored and used in the ship's inert gas system. Its advantages include:

[0062] 1. The embodiment of the present invention uses electrolysis unit 3 to electrolyze and modify natural seawater, which can increase the alkalinity of seawater and improve its absorption capacity. At the same time, the strong oxidizing substances generated by electrolysis can oxidize the insoluble NO gas in the ship's exhaust, thereby achieving NO X and SO X Synchronous removal of

[0063] 2. The embodiment of the present invention utilizes the oxidation pre-wash section 41 of the absorption tower 4 to perform preliminary treatment on the ship exhaust gas. It can not only oxidize the NO gas in the ship exhaust gas by modifying the seawater, but also reduce the exhaust gas temperature by pre-washing, improve the subsequent absorption efficiency, and also preliminarily wash and remove NO in the flue gas. X and SO X , making full use of equipment space and meeting the compact design requirements of ship equipment;

[0064] 3. The embodiment of the present invention removes CO2 from ship exhaust gas by chemical absorbent and removes NO X and SO X The removal is completed in the same absorption tower 4, and the equipment is compact and easy to install;

[0065] 4. In the embodiment of the present invention, the washing rich liquid after the chemical absorbent reaction can be regenerated through the water treatment unit 12 and the desorption tower 9 to achieve absorption liquid recycling, minimize absorbent consumption, and alleviate the absorbent replenishment problem under ship operating conditions;

[0066] 5. In the embodiment of the present invention, the heat required for heating the washing rich liquid is provided by the ship's flue gas, which not only saves energy but also cools the flue gas and improves the absorption efficiency.

[0067] 6. The desorption of the washing rich liquid in the embodiment of the present invention adopts the ultrasonic-high temperature coupled desorption technology, which can improve the desorption efficiency and shorten the desorption time;

[0068] 7. The high-concentration CO2 gas generated by desorption in the embodiment of the present invention can be directly used in the inert gas system of the ship, thereby improving the recovery and utilization rate of the CO2 gas.

[0069] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A comprehensive ship exhaust treatment system, characterized in that: It comprises a seawater inlet pipeline (1), a seawater pump (2), an electrolysis unit (3), an absorption tower (4), a seawater outlet pipeline (5), a washing liquid buffer tank (6), a washing liquid supply pump (7), a booster pump (8), a desorption tower (9), a flue gas pipeline (10) and a CO2 storage bin (11); The absorption tower (4) comprises an oxidation pre-washing section (41) and a chemical absorption section (42) which are interconnected, and a packing layer (421) is provided in the chemical absorption section (42); The desorption tower (9) comprises a heating section (91) and a desorption section (92) arranged in sequence from bottom to top, and an ultrasonic generator (921) is provided on the desorption section (92). The washing liquid entering the desorption tower (9) can be heated in the heating section (91) and then enter the desorption section (92) to release CO2; The seawater inlet pipeline (1) is in communication with the inlet of the seawater pump (2), the outlet of the seawater pump (2) is in communication with the inlet of the electrolysis unit (3), the outlet of the electrolysis unit (3) is in communication with the seawater inlet of the oxidation pre-washing section (41), the seawater outlet of the oxidation pre-washing section (41) is in communication with the seawater outlet pipeline (5); the bottom outlet of the chemical absorption section (42) is in communication with the inlet of the washing liquid buffer tank (6), and the outlet of the washing liquid buffer tank (6) is divided into two outlets. , one path is communicated with the inlet of the washing liquid supply pump (7), the outlet of the washing liquid supply pump (7) is communicated with the inlet of the chemical absorption section (42), the other path is communicated with the inlet of the booster pump (8), the outlet of the booster pump (8) is communicated with the washing liquid inlet of the heating section (91), the washing liquid outlet of the desorption section (92) is communicated with the inlet of the washing liquid buffer tank (6), and the CO2 outlet of the desorption section (92) is communicated with the inlet of the CO2 storage bin (11); The flue gas pipeline (10) is connected to the flue gas inlet of the heating section (91), and the flue gas outlet of the heating section (91) is connected to the flue gas inlet of the oxidation pre-washing section (41).

2. The ship exhaust comprehensive treatment system according to claim 1, characterized in that: A water treatment unit (12) is provided on the pipeline between the outlet of the washing liquid buffer tank (6) and the inlet of the booster pump (8), and the water treatment unit (12) is used to remove impurities in the washing liquid.

3. The ship exhaust comprehensive treatment system according to claim 1, characterized in that: The ship exhaust gas comprehensive treatment system also includes a condensate return pipeline (13), a condenser (14) is provided on the pipeline between the CO2 outlet of the desorption section (92) and the inlet of the CO2 storage bin (11), and the bottom outlet of the CO2 storage bin (11) is connected to the desorption section (92) through the condensate return pipeline (13).

4. The ship exhaust comprehensive treatment system according to claim 1, characterized in that: The ship exhaust gas integrated treatment system further comprises an absorbent storage cabinet (15) and an absorbent replenishing pump (16), wherein the outlet of the absorbent storage cabinet (15) is connected to the inlet of the absorbent replenishing pump (16), and the outlet of the absorbent replenishing pump (16) is connected to the inlet of the washing liquid buffer tank (6).

5. The ship exhaust comprehensive treatment system according to claim 1, characterized in that: The heating section (91) and the desorption section (92) are separated by a partition (93). A washing liquid pipeline (94) is provided in the desorption tower (9). The bottom end of the washing liquid pipeline (94) is located in the heating section (91). The top end of the washing liquid pipeline (94) passes through the partition (93) and extends into the desorption section (92). The outlet of the booster pump (8) is connected to the bottom end of the washing liquid pipeline (94).

6. The ship exhaust comprehensive treatment system according to claim 5, characterized in that: A first spray layer (95) is provided in the desorption section (92), and the first spray layer (95) is communicated with the top end of the washing liquid pipeline (94).

7. The ship exhaust comprehensive treatment system according to claim 5, characterized in that: The washing liquid pipeline (94) comprises a first pipe section (941) located in the heating section (91) and a second pipe section (942) located in the desorption section (92); the first pipe section (941) is a bent structure.

8. The ship exhaust comprehensive treatment system according to claim 1, characterized in that: A second spray layer (422) is provided in the chemical absorption section (42), the second spray layer (422) is located above the packing layer (421), and the outlet of the washing liquid supply pump (7) is connected to the second spray layer (422).

9. The ship exhaust comprehensive treatment system according to claim 1, characterized in that: A third spray layer (411) is provided in the oxidation pre-wash section (41), and the outlet of the electrolysis unit (3) is connected to the third spray layer (411).

10. The ship exhaust comprehensive treatment system according to claim 1, characterized in that: The absorption tower (4) further comprises a connecting section (43), one end of the connecting section (43) being connected to the oxidation pre-washing section (41), and the other end of the connecting section (43) being connected to the chemical absorption section (42), and the connecting position between the connecting section (43) and the chemical absorption section (42) is located below the packing layer (421).

11. The ship exhaust comprehensive treatment system according to claim 10, characterized in that: The connecting section (43) is tilted, and the height of the connecting section (43) close to one end of the chemical absorption section (42) is greater than the height of the connecting section (43) close to one end of the oxidation pre-washing section (41).

12. A ship, characterized in that: The invention comprises a comprehensive ship exhaust treatment system as claimed in any one of claims 1 to 11.

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