An exhaust gas recovery and purification system applicable to ammonia-powered chemical ships

Abstract

The present invention discloses an exhaust gas recovery and purification system applicable to ammonia-powered chemical ships, which includes an induced draft fan, an exhaust gas absorption device, an absorption liquid storage device, and a storage device. The induced draft fan is connected to the exhaust gas absorption device through a pipeline. The exhaust gas absorption device is connected to the absorption liquid storage device through a pipeline. The storage device is connected to the absorption liquid storage device through a pipeline. The induced draft fan and the exhaust gas absorption device form a first circulation loop. The absorption liquid storage device and the exhaust gas absorption device form a second circulation loop. The circulation direction of the first circulation loop is opposite to that of the second circulation loop. The present invention utilizes the opposite flow directions formed by the first circulation loop and the second circulation loop, enabling the absorption liquid and ammonia-containing exhaust gas to be circularly treated within a reaction unit composed of the induced draft fan, the exhaust gas absorption device, and the absorption liquid storage device, improving the absorption efficiency of ammonia and the concentration of the formed ammonia water, saving water resources, simplifying the treatment process, and greatly saving costs.

Description

Technical Field

[0001] The present invention belongs to the technical field of tail gas treatment, and particularly relates to a tail gas recovery and purification system applicable to ammonia-powered chemical ships. Background Art

[0002] In order to protect the marine environment and promote the sustainable and healthy development of the shipbuilding industry, the International Maritime Organization has discussed and decided that by 2050, the greenhouse gas emissions of ships should be reduced by half compared with 2008, and by 2030, the carbon intensity of international shipping should be reduced by 40%. It can be foreseen that in the future, clean new energy ships will gradually replace traditional energy ships. At present, each shipyard has begun to actively seek clean and efficient energy, and ammonia, as a highly efficient and clean energy, has come into people's view.

[0003] Ammonia gas is colorless, toxic, highly reactive, corrosive, and has a strong odor. If directly discharged into the environment, it will cause a series of problems such as eutrophication of water bodies and air pollution. In the prior art, the treatment of ammonia-containing tail gas is water absorption treatment, but it requires multi-stage absorption treatment, with a large number of devices required, complex process structures, and high costs; currently, there is no efficient ammonia-containing tail gas treatment device that also takes into account economic benefits. Summary of the Invention

[0004] In order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide a tail gas recovery and purification system applicable to ammonia-powered chemical ships, aiming to solve the following technical problems in the prior art:

[0005] In the prior art, the treatment of ammonia-containing tail gas is water absorption treatment, but it requires multi-stage absorption treatment, with a large number of devices required, complex process structures, and high costs.

[0006] The present invention adopts the following technical solutions to achieve:

[0007] A tail gas recovery and purification system applicable to ammonia-powered chemical ships, comprising,

[0008] An absorption system for water treatment absorption and purification of ammonia-containing tail gas to generate ammonia water, an induced draft fan, a tail gas absorption device, an absorption liquid storage device, and a storage device. The induced draft fan is connected to the tail gas absorption device through a pipeline, the tail gas absorption device is connected to the absorption liquid storage device through a pipeline, and the storage device is connected to the absorption liquid storage device through a pipeline;

[0009] The induced draft fan and the tail gas absorption device form a first circulation loop, the absorption liquid storage device and the tail gas absorption device form a second circulation loop, and the circulation direction of the first circulation loop is opposite to that of the second circulation loop.

[0010] The tail gas recovery and purification system performs water absorption on ammonia-containing tail gas. By utilizing the opposite flow directions formed by the first circulation loop and the second circulation loop, the absorption liquid and the ammonia-containing tail gas are circulated and processed within a reaction unit composed of an induced draft fan, a tail gas absorption device, and an absorption liquid temporary storage device, improving the absorption efficiency of ammonia and the concentration of the formed ammonia water, saving water resources, simplifying the treatment process, and greatly reducing costs.

[0011] To optimize the above technical solution, the specific measures taken also include:

[0012] Furthermore, it also includes an ammonia concentration detector, an ammonia water concentration detector, and an acid treatment device. The ammonia concentration detector is arranged on the first circulation loop, the ammonia water concentration detector is arranged on the second circulation loop, and the acid treatment device is connected to the first circulation loop.

[0013] Furthermore, the tail gas absorption device includes

[0014] an absorption tank;

[0015] a liquid injection assembly for inputting the absorption liquid stored in the absorption liquid temporary storage device into the absorption tank from top to bottom;

[0016] a tail gas injection assembly for inputting the ammonia-containing tail gas introduced by the induced draft fan into the absorption tank from bottom to top;

[0017] an atomization assembly for atomizing and spraying the absorption liquid and carrying out absorption mixing with the ammonia-containing tail gas.

[0018] Furthermore, the liquid injection assembly includes a liquid diversion cavity and a gas diversion cavity. The liquid diversion cavity is connected to the absorption liquid temporary storage device through a pipeline. The gas diversion cavity is arranged on the side wall of the liquid diversion cavity. The lower end of the liquid diversion cavity is provided with a first outlet, and the lower end of the gas diversion cavity is provided with a second outlet. The second outlet is annularly arranged around the first outlet.

[0019] Furthermore, the gas diversion cavity includes a storage area and a compression area. The storage area is provided with an inlet, and the gas flow cross-sectional area of the compression area is smaller than that of the storage area.

[0020] Furthermore, the tail gas injection assembly is arranged around the atomization assembly. The tail gas injection assembly includes an aeration pipeline arranged in a ring shape.

[0021] Furthermore, the atomization assembly includes a base, a support platform, a motor, and a rotary cutting member. The base is arranged below the interior of the absorption tank. The support platform is arranged on the base. The motor is arranged inside the base. The rotary cutting member is connected to the output end of the motor. The rotary cutting member is arranged directly below the first outlet.

[0022] Further, a filter screen is provided on the outer ring of the rotating table, and the filter screen is provided with mesh holes that rise from the inside to the outside at a certain angle.

[0023] Further, the rotary cutting member includes a rotating table and a cutting blade. The rotating table is connected to the output end of the motor. The cutting blade is arranged on one side of the rotating table close to the first outlet, and a plurality of dividing holes are provided on the cutting blade.

[0024] Advantages of the present invention:

[0025] Compared with the prior art, a tail gas recovery and purification system applicable to ammonia-powered chemical ships of the present invention utilizes the reverse flow formed by the first circulation loop and the second circulation loop, enabling the absorption liquid and the ammonia-containing tail gas to be circulated and processed within a reaction unit composed of an induced draft fan, a tail gas absorption device, and an absorption liquid storage device, improving the absorption efficiency of ammonia and the concentration of the formed ammonia water, saving water resources, simplifying the treatment process, and greatly saving costs.

[0026] The atomization assembly and the liquid injection assembly can atomize and break the input absorption liquid, and then mix it with the rising ammonia-containing tail gas. The gas diversion cavity is used to mix part of the ammonia-containing tail gas, part of the absorption liquid, and the mixed atomized liquid formed by the ammonia-containing tail gas with the absorption liquid again, and then perform secondary impact atomization to improve the mixing degree of the ammonia-containing tail gas dissolved in the absorption liquid. Description of the Drawings

[0027] Figure 1 is a process connection diagram of a tail gas recovery and purification system applicable to ammonia-powered chemical ships of the present invention.

[0028] Figure 2 is the present invention Figure 1 a schematic structural diagram of the tail gas absorption device in.

[0029] Figure 3 is the present invention Figure 2 a partial internal structural diagram of the tail gas absorption device in.

[0030] Figure 4 is the present invention Figure 3 internal front view of.

[0031] Figure 5 is the present invention Figure 4 top view of.

[0032] Figure 6 is the present invention Figure 4 a partial enlarged view of a part of the structure in.

[0033] Figure 7 is the present invention Figure 6 an installation top view of the tail gas injection assembly in.

[0034] The reference numerals are: induced draft fan 10, tail gas absorption device 20, absorption tank 21, liquid injection assembly 22, liquid diversion cavity 221, first outlet 2211, gas diversion cavity 222, second outlet 2221, first support 223, tail gas injection assembly 23, aeration pipeline 231, support 232, atomization assembly 24, base 241, support platform 242, motor 243, rotary cutting member 244, rotary table 2441, cutting blade 2442, filter screen 2443, mesh hole 2444, rotary track 245, ball 246, absorption liquid temporary storage device 30, storage device 40, ammonia concentration detector 50, ammonia water concentration detector 60, acid treatment device 70. Detailed implementation manners

[0035] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the following will describe the detailed implementation manners of the present invention with reference to the accompanying drawings of the specification.

[0036] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Those skilled in the art can make similar promotions without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0037] Secondly, the so-called "one embodiment" or "embodiment" herein refers to a specific feature, structure or characteristic that can be included in at least one implementation manner of the present invention. The "in one embodiment" appearing in different places in this specification does not all refer to the same embodiment, nor is it an independent or selectively exclusive embodiment from other embodiments. Embodiment

[0038] Referring to Figures 1-7 , the present invention provides a tail gas recovery and purification system applicable to ammonia-powered chemical ships, which can form two circulation loops and perform cyclic absorption treatment on ammonia-containing tail gas in a reaction unit.

[0039] As Figure 1 shown, a tail gas recovery and purification system applicable to ammonia-powered chemical ships includes an induced draft fan 10, a tail gas absorption device 20, an absorption liquid temporary storage device 30, and a storage device 40. The induced draft fan 10 is connected to the tail gas absorption device 20 through a pipeline, the tail gas absorption device 20 is connected to the absorption liquid temporary storage device 30 through a pipeline, and the storage device 40 is connected to the absorption liquid temporary storage device 30 through a pipeline;

[0040] The induced draft fan 10 and the tail gas absorption device 20 form a first circulation loop, the absorption liquid storage device 30 and the tail gas absorption device 20 form a second circulation loop, and the circulation direction of the first circulation loop is opposite to that of the second circulation loop.

[0041] The induced draft fan 10 introduces ammonia-containing tail gas into the tail gas absorption device 20. A circulation pipeline is provided on the tail gas absorption device 20, and the ammonia-containing tail gas circulates through the circulation pipeline. A one-way valve is provided between the induced draft fan 10 and the circulation pipeline to ensure that the ammonia-containing tail gas introduced by the induced draft fan 10 flows between the tail gas absorption device 20 and the circulation pipeline. At the same time, a plurality of electrically controlled valves are provided on the pipeline to control the on-off of the circulation loop and the on-off of the induced draft fan 10. The absorption liquid storage device 30 adopts a tank structure. The absorption liquid storage device 30 is connected to the external pipeline for inputting and storing pure water. A circulation pump is provided between the absorption liquid storage device 30 and the tail gas absorption device 20. This circulation pump transports the pure water stored in the absorption liquid storage device 30 into the tail gas absorption device 20. The pure water is mixed with the ammonia-containing tail gas in the tail gas absorption device 20 to form an absorption liquid, and this absorption liquid will flow back to the absorption liquid storage device 30.

[0042] In order to detect the ammonia concentration in the absorbed ammonia-containing tail gas and the concentration of ammonia water in the absorption liquid after a certain number of cycles, and to show that the ammonia concentration in the ammonia-containing tail gas meets the emission standard, so as to perform the operation of the next process, this tail gas recovery and purification system further includes an ammonia gas concentration detector 50, an ammonia water concentration detector 60, and an acid treatment device 70. The ammonia gas concentration detector 50 is provided on the first circulation loop, the ammonia water concentration detector 60 is provided on the second circulation loop, and the acid treatment device 70 is connected to the first circulation loop. A plurality of electromagnetic valves are provided on both the first circulation pipeline and the second circulation pipeline. By detecting relevant parameters with the ammonia gas concentration detector 50 and the ammonia water concentration detector 60, the on-off of the relevant electromagnetic valves is controlled.

[0043] The ammonia water after repeated absorption is stored in the storage device 40. The tail gas after repeated absorption is input into the acid treatment device 70. Dilute sulfuric acid, dilute hydrochloric acid, and dilute phosphoric acid are provided in the acid treatment device 70. The tail gas containing trace ammonia reacts with dilute sulfuric acid, dilute hydrochloric acid, and dilute phosphoric acid to generate ammonium sulfate, ammonium chloride, or ammonium phosphate. Embodiment

[0044] Refer to Figures 1-7, this embodiment provides an exhaust gas recovery and purification system applicable to ammonia-powered chemical ships, which can atomize and break the input absorbent liquid, then mix it with the rising ammonia-containing exhaust gas, and use the gas diversion chamber 222 to mix part of the ammonia-containing exhaust gas, part of the absorbent liquid and the mixed atomized liquid generated by the ammonia-containing exhaust gas with the absorbent liquid again, and then perform secondary impact atomization to improve the mixing degree of the ammonia-containing exhaust gas dissolved in the absorbent liquid.

[0045] An exhaust gas recovery and purification system applicable to ammonia-powered chemical ships, the exhaust gas absorption device 20 includes,

[0046] Absorption tank 21;

[0047] Liquid injection assembly 22, used to input the absorbent liquid stored in the absorbent liquid temporary storage device 30 into the absorption tank 21 from top to bottom;

[0048] Exhaust gas injection assembly 23, used to input the ammonia-containing exhaust gas introduced by the induced draft fan 10 into the absorption tank 21 from bottom to top;

[0049] Atomization assembly 24, used to atomize and spray the absorbent liquid and absorb and mix it with the ammonia-containing exhaust gas.

[0050] The liquid injection assembly 22 includes a liquid diversion chamber 221 and a gas diversion chamber 222. A first support 223 is arranged around the liquid diversion chamber 221. One end of the first support 223 is arranged on the outer side wall of the liquid diversion chamber 221, and the other end of the first support 223 is arranged on the side wall of the absorption tank 21. The liquid diversion chamber 221 is connected to the absorbent liquid temporary storage device 30 through a pipeline. The gas diversion chamber 222 is arranged on the side wall of the liquid diversion chamber 221. A first outlet 2211 is arranged at the lower end of the liquid diversion chamber 221, and a second outlet 2221 is arranged at the lower end of the gas diversion chamber 222. The second outlet 2221 is annularly arranged around the first outlet 2211. The gas diversion chamber 222 includes a storage area and a compression area. An inlet is provided in the storage area, and the gas flow cross-sectional area of the compression area is smaller than that of the storage area. By setting the compression area, the gas flow rate is increased.

[0051] During operation, the absorbent liquid is first input into the liquid diversion chamber 221, then flows downward and flows out from the first outlet 2211. During the flow process, an air flow pressure difference is generated at the second outlet 2221, and then it will drive the atomized absorbent liquid and part of the ammonia-containing exhaust gas to be input into the gas diversion chamber 222, and then discharged from the second outlet 2221 of the gas diversion chamber 222, and at the same time, it is mixed with the absorbent liquid flowing out from the first outlet 2211.

[0052] The tail gas injection assembly 23 is disposed around the atomization assembly 24. The tail gas injection assembly 23 includes an aeration pipe 231 arranged in a ring shape. The aeration pipe 231 is arranged on the second bracket 232. The second bracket 232 is arranged around the base 241. The second bracket 232 has a cross-shaped structure. One end of the second bracket 232 is arranged on the base 24, and the other end of the second bracket 232 is arranged on the inner side wall of the absorption tank 21.

[0053] The atomization assembly 24 includes a base 241, a support platform 242, a motor 243, and a rotary cutting member 244. The base 241 is arranged below the interior of the absorption tank 21. The support platform 242 is arranged on the base 241. The motor 243 is arranged inside the base 241. The rotary cutting member 244 is connected to the output end of the motor 243. The rotary cutting member 244 is arranged directly below the first outlet 2211. The rotary cutting member 244 includes a rotary table 2441 and cutting blades 2442. The rotary table 2441 is connected to the output end of the motor 243. The cutting blades 2442 are arranged on the side of the rotary table 2441 close to the first outlet 2211. A number of dividing holes are arranged on the cutting blades 2442. A filter screen 2443 is arranged on the outer circle of the rotary table 2441. Mesh holes 2444 that slope upward from the inside to the outside at a certain angle are formed on the filter screen 2443. In order to ensure the stability of the rotation of the rotary table 2441, a rotary track 245 is arranged between the rotary table 2441 and the support platform 242, and balls 246 are arranged inside the rotary track 245.

[0054] The atomization assembly 24 has two working modes, depending on whether the motor 243 is started as needed:

[0055] When the motor 243 is not started, the mixed absorption liquid is discharged from the first outlet 2211, and then impacts downward on the rotary table 2441. The absorption liquid will explode and disperse around to form small water droplets. After the small water droplets are formed, part of them are divided into smaller water droplets through the dividing holes on the cutting blades 2442, and part of the small water droplets pass through the mesh holes 2444 on the filter screen 2443, so that the small water droplets form a water mist in the shape of an upward parabola, and then are mixed with the ammonia-containing tail gas output from the aeration pipe.

[0056] When the motor 243 is started, the mixed absorption liquid is discharged from the first outlet 2211, and then impacts downward on the rotary table 2441. The absorption liquid is cut by the cutting blades 2442 on the rotary table 2441 to form small water droplets, and then is miniaturized through the dividing holes and / or the mesh holes 2444, so that the small water droplets form a water mist in the shape of an upward parabola, and then are mixed with the ammonia-containing tail gas output from the aeration pipe. The difference between the two working modes lies in the height of the upward parabola formed by the small water droplets, which can be set according to specific needs and is not specifically required in this embodiment.

[0057] The above are only embodiments of the present invention. Specific structures and characteristics and other common knowledge in the prior art are not described in detail herein. Those of ordinary skill in the art know all the common general technical knowledge in the technical field to which the invention pertains before the filing date or the priority date, can learn all the prior art in this field, and have the ability to apply conventional experimental means before this date. Those of ordinary skill in the art can, under the inspiration given in this application and in combination with their own capabilities, perfect and implement this solution. Some typical well-known structures or well-known methods should not become an obstacle for those of ordinary skill in the art to implement this application.

[0058] It should be noted that for those skilled in the art, without departing from the structure of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicality of the patent. The protection scope required by this application should be based on the content of its claims, and the specific implementation manners and the like described in the specification can be used to interpret the content of the claims.

Claims

1. An exhaust gas recovery and purification system applicable to ammonia-powered chemical ships, characterized in that: It includes an induced draft fan, a tail gas absorption device, an absorption liquid temporary storage device, and a storage device. The induced draft fan is connected to the tail gas absorption device through a pipeline. The tail gas absorption device is connected to the absorption liquid temporary storage device through a pipeline. The storage device is connected to the absorption liquid temporary storage device through a pipeline; The induced draft fan and the tail gas absorption device form a first circulation loop. The absorption liquid temporary storage device and the tail gas absorption device form a second circulation loop. The circulation direction of the first circulation loop is opposite to that of the second circulation loop; The tail gas absorption device includes an absorption tank; a liquid injection assembly for inputting the absorption liquid stored in the absorption liquid temporary storage device into the absorption tank from top to bottom; A tail gas injection assembly for inputting the ammonia-containing tail gas introduced by the induced draft fan into the absorption tank from bottom to top; An atomization assembly for atomizing and spraying the absorption liquid and performing absorption mixing with the ammonia-containing tail gas; The liquid injection assembly includes a liquid diversion cavity and a gas diversion cavity. The liquid diversion cavity is connected to the absorption liquid temporary storage device through a pipeline. The gas diversion cavity is arranged on the side wall of the liquid diversion cavity. A first outlet is arranged at the lower end of the liquid diversion cavity. A second outlet is arranged at the lower end of the gas diversion cavity. The second outlet surrounds the first outlet in a ring shape; The gas diversion cavity includes a storage area and a compression area. An inlet is opened in the storage area. The gas flow cross-sectional area of the compression area is smaller than that of the storage area; The tail gas injection assembly is arranged around the atomization assembly. The tail gas injection assembly includes an aeration pipeline arranged in a ring shape; The atomization assembly includes a base, a support platform, a motor, and a rotary cutting member. The base is arranged below the inside of the absorption tank. The support platform is arranged on the base. The motor is arranged inside the base. The rotary cutting member is connected to the output end of the motor. The rotary cutting member is arranged directly below the first outlet; The rotary cutting member includes a rotary table and cutting blades. The rotary table is connected to the output end of the motor. The cutting blades are arranged on the side of the rotary table close to the first outlet. A plurality of dividing holes are arranged on the cutting blades; A filter screen is arranged on the outer circle of the rotary table. Mesh holes that rise upward from the inside to the outside at a certain angle are opened on the filter screen.

2. The tail gas recovery and purification system for ammonia-powered chemical ships according to claim 1, characterized in that: It also includes an ammonia concentration detector, an ammonia water concentration detector, and an acid treatment device. The ammonia concentration detector is arranged on the first circulation loop. The ammonia water concentration detector is arranged on the second circulation loop. The acid treatment device is connected to the first circulation loop.

3. The exhaust gas recovery and purification system for ammonia-powered chemical ships according to claim 2, characterized in that, A rotary track is arranged between the rotary table and the support platform. There are balls in the rotary track.

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