Ammonium sulfate drying tail gas washing tower for ammonia desulphurization

Abstract

The utility model relates to an ammonium sulfate dry tail gas washing tower for ammonia desulfurization, which is used for washing out ammonium sulfate from dry tail gas containing ammonium sulfate, and comprises a first washing section and a second washing section, the second washing section is arranged above the first washing section, and the first washing section and the second washing section are mutually connected in a gas guide manner. Dry tail gas containing ammonium sulfate can sequentially flow upwards through the first washing section and the second washing section, so that ammonium sulfate in the dry tail gas can be absorbed into washing liquid in the first washing section and the second washing section, the first washing section is provided with a first overflow pipeline, and the first overflow pipeline is designed to be used for leading out the washing liquid in the first washing section from the first washing section and leading out the washing liquid in the second washing section from the second washing section. The second washing section has a second overflow line which is designed to introduce the washing liquid in the second washing section into the first washing section. According to the utility model, on one hand, the environmental pollution is reduced, and on the other hand, the ammonium sulfate yield can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of ammonium sulfate drying tail gas washing tower for ammonia desulfurization. BACKGROUND

[0002] Ammonia desulfurization is a kind of efficient, low energy consumption wet desulfurization mode.Ammonium sulfate solution produced in the desulfurization process can be obtained ammonium sulfate solid by evaporation, crystallization, drying and other steps, which can be recycled as fertilizer.For example.In addition to ammonium sulfate solid, drying tail gas containing ammonium sulfate (more precisely ammonium sulfate dust) is also produced in the drying process, which cannot be directly discharged into the atmosphere environment due to environmental protection standards.Such drying tail gas containing ammonium sulfate therefore needs to be treated to meet increasingly stringent emission standards.Meanwhile, ammonium sulfate in drying tail gas is also recycled.

[0003] CN202460375U discloses a desulfurization dust-containing tail gas washing device, which comprises a washing tower, a washing circulating pump and corresponding connecting pipelines, and an inlet nozzle, a washing spray layer and a mist eliminator layer are arranged in the washing tower from bottom to top between a drying tail gas inlet and a drying tail gas outlet.The drying tail gas inlet is located in the middle and lower part of the washing tower, the drying tail gas outlet is located in the upper part of the washing tower, the washing spray layer and the mist eliminator are located in the middle and upper part of the washing tower, and the washing spray liquid at the bottom is connected to the washing nozzle inside the washing tower.However, this device cannot meet the new emission standards.

[0004] CN221207376U discloses a tail gas washing and purification device connected downstream of an ammonium sulfate drying device.The tail gas washing and purification device comprises a washing tank body and two conical cover bodies connected to the two sides of the washing tank body respectively.An inlet pipe and an exhaust pipe are connected to each of the two conical cover bodies.A liquid outlet pipe is connected to the bottom of the washing tank body, a foam catching plate is embedded in the washing tank body through a mounting slot, and a flushing interface and a spraying interface are respectively provided on the outer side of the conical cover body on the exhaust pipe side.The flushing nozzle and the spraying nozzle on the inner side of the conical cover body are in fluid communication with the flushing interface and the spraying interface through a flushing pipe and a spraying pipe respectively.The tail gas washing and purification device is installed downstream of a water bath dust collector, and is used for secondary reverse spraying of the discharged drying tail gas through the tail gas washing and purification device.The tail gas is absorbed by the secondary spraying, and the V-shaped plate is used to block the escape of mist, thereby purifying the tail gas.However, this device has a large number of components and complex control. SUMMARY

[0005] The utility model aims at at least one of the problems mentioned above can be solved by providing a kind of ammonium sulfate drying tail gas washing tower for ammonia desulfurization.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a kind of ammonium sulfate drying tail gas washing tower for ammonia desulfurization, the ammonium sulfate drying tail gas washing tower is used to wash out ammonium sulfate from the drying tail gas containing ammonium sulfate, it is characterized in that, the ammonium sulfate drying tail gas washing tower includes first washing section and second washing section, the second washing section is arranged above the first washing section and both are connected with each other in gas guide direction, wherein, in working condition, drying tail gas containing ammonium sulfate can flow through first washing section and second washing section in sequence upwards, so that ammonium sulfate in drying tail gas can be absorbed into the washing liquid in first washing section and second washing section, wherein, the first washing section has first overflow pipeline, the first overflow pipeline is designed to be able to export washing liquid in first washing section from first washing section, and the second washing section has second overflow pipeline, the second overflow pipeline is designed to be able to import washing liquid in second washing section into first washing section.

[0007] The technical effects that can be achieved by the utility model include but are not limited to: on the one hand, the pollution to the environment is reduced, and on the other hand, the ammonium sulfate production can be improved.

[0008] Advantageously, the ammonium sulfate drying tail gas washing tower has a disc-shaped liquid collector, the first washing section and the second washing section are separated from each other via the liquid collector, wherein the liquid collector constitutes the bottom of the second washing section and forms a space for collecting the washing liquid together with the lower part of the side wall of the second washing section.

[0009] Advantageously, an air passage is provided on the liquid collector, the first washing section and the second washing section are connected with each other in gas guide direction through the air passage, the air passage extends upwards into the second washing section from the liquid collector, so that the upper opening of the air passage is arranged at a vertical distance from the liquid collector.

[0010] Advantageously, the air passage is provided with a cap, the cap is kept above the upper opening of the air passage at a distance from the upper opening, so that a lateral gap is formed between the cap and the upper opening, and the drying tail gas can enter the second washing section from the first washing section through the lateral gap.

[0011] Advantageously, the second washing section has an overflow interface on the side wall of the second washing section, the second overflow pipeline is in fluid communication with the second washing section through the overflow interface, wherein the position height of the overflow interface in the vertical direction is lower than the position height of the upper opening in the vertical direction.

[0012] Advantageously, the first washing section has a first solution circulation system with a first circulation line and a first circulation pump arranged in the first circulation line, the first circulation pump being designed to be able to pump washing liquid in the first washing section via the first circulation line to above the tail gas inlet for the introduction of dry tail gas on the first washing section, and the first solution circulation system has a first spray distributor designed to be able to spray the pumped washing liquid downwards.

[0013] Advantageously, the first washing section has a first gas-liquid contactor arranged below the first spray distributor, the first gas-liquid contactor being designed to be able to bring the upwardly directed dry tail gas into gas-liquid contact with the washing liquid sprayed downwards by the first spray distributor at the first gas-liquid contactor.

[0014] Advantageously, the first washing section has a first mist eliminator arranged above the first spray distributor, the first mist eliminator being designed to be able to capture liquid mist droplets containing ammonium sulphate.

[0015] Advantageously, the second washing section has a second solution circulation system with a second circulation line and a second circulation pump arranged in the second circulation line, the second circulation pump being designed to be able to pump washing liquid in the second washing section upwards via the second circulation line, and the second solution circulation system has a second spray distributor designed to be able to spray the pumped washing liquid downwards.

[0016] Advantageously, the second washing section has a second gas-liquid contactor arranged below the second spray distributor, the second gas-liquid contactor being designed to be able to bring the upwardly directed dry tail gas into gas-liquid contact with the washing liquid sprayed downwards by the second spray distributor at the second gas-liquid contactor.

[0017] Advantageously, the second washing section has a second mist eliminator arranged above the second spray distributor, the second mist eliminator being designed to be able to capture liquid mist droplets containing ammonium sulphate.

[0018] Advantageously, the second washing section is provided with a process water make-up line designed to be able to make up process water into the second washing section.

[0019] Advantageously, the first overflow line has a first on-off valve for opening or closing the first overflow line, and the second overflow line has a second on-off valve for opening or closing the second overflow line. BRIEF DESCRIPTION OF DRAWINGS

[0020] The utility model will be explained in more detail below with the help of embodiments with reference to the drawings, but the utility model is not limited to the embodiments described in the drawings and explained in detail below. The drawings are as follows:

[0021] Figure 1 The schematic diagram of an ammonium sulfate drying tail gas scrubber for treating ammonium sulfate-containing drying tail gas according to an embodiment of the utility model is shown. DETAILED DESCRIPTION

[0022] The illustrative embodiments of the ammonium sulfate drying tail gas scrubber of the utility model are described below. In this description, only for the purpose of explanation, each system, structure and device is schematically depicted in the drawings, but not all features of the actual system, structure and device are described, such as the well-known functions or structures are not described in detail, to avoid unnecessary details to make the utility model obscure. It should be understood that in any actual application, many specific implementation decisions need to be made to achieve the specific goals of the developers or users, and need to comply with the system-related and industry-related restrictions, and these specific goals may be different with different actual applications. In addition, it should be understood that such specific implementation decisions, although complex and time-consuming, are routine tasks for those skilled in the art who benefit from the utility model.

[0023] The terms and phrases used herein should be understood and interpreted in accordance with the meanings of these terms and phrases as understood by those skilled in the relevant art. The consistent use of a term or phrase in this document is not intended to imply a special definition of the term or phrase, that is, a definition different from the ordinary and customary meaning understood by those skilled in the art. For terms or phrases intended to have a special meaning, that is, a meaning different from that understood by those skilled in the art, such a special definition will be explicitly listed in the specification in a defined manner, directly and unambiguously giving the special definition of the term or phrase.

[0024] Unless the context requires otherwise, throughout the specification and claims of this document, the word "comprise" and variations thereof such as "comprises" and "comprising" will be construed in an open, inclusive sense, that is, as "including, but not limited to."

[0025] Figure 1 The ammonium sulfate drying tail gas scrubber 100 according to an embodiment of the utility model is schematically shown.

[0026] Referring to Figure 1The ammonium sulphate drying off-gas scrubbing column 100 can have a substantially vertically extending, hollow-cylindrical shape, for example made of sheet metal. However, other shapes of the ammonium sulphate drying off-gas scrubbing column 100 are conceivable, for example a hollow-prismatic shape can be envisaged. The ammonium sulphate drying off-gas scrubbing column 100 can have a first scrubbing section 3 located below and a second scrubbing section 5 located above the first scrubbing section 3. The side walls of the first and second scrubbing sections 3, 5 can be integral parts of the ammonium sulphate drying off-gas scrubbing column 100. However, a design is also conceivable in which the side walls of the first and second scrubbing sections 3, 5 are separate from each other, as long as the lowest point of the second scrubbing section 5 is higher than the first scrubbing section 3.

[0027] With reference to Figure 1 The ammonium sulphate drying off-gas scrubbing column 100 further has a collector 4. The collector 4 can be a disc-shaped partition, for example fixedly connected, for example welded, to the inner peripheral wall of the ammonium sulphate drying off-gas scrubbing column 100, which can extend substantially horizontally and thus constitutes the bottom of the second scrubbing section 5, in the space of which the scrubbing liquid, described in more detail below, can collect. By means of the collector 4, the ammonium sulphate drying off-gas scrubbing column 100 can be divided into the first and second scrubbing sections 3, 5 described above. In other words, the collector 4 constitutes the top of the first scrubbing section 3 and at the same time the bottom of the second scrubbing section 5.

[0028] Furthermore, the ammonium sulphate drying off-gas scrubbing column 100 can also have a venting duct 13 arranged on the collector 4. The venting duct 13 extends vertically upwards from the collector 4 in the second scrubbing section 5. The venting duct 13 and the collector 4 can be made separately from each other and then connected together. The collector 4 can have a recess 27 which is adapted to the cross-sectional shape of the venting duct 13. The venting duct 13 can be inserted with its lower end into the recess 27. The lower end side of the venting duct 13 can be aligned with the lower end side of the recess 27 on the collector 4, and the venting duct 13 is fixedly connected, for example welded, with the collector 4 at the recess 27. The venting duct 13 can have an upper opening 15 and a lower opening 16. The lower opening 16 opens downwards towards the first scrubbing section 3, while the upper opening 15 opens upwards towards the second scrubbing section 5. Thus, the first scrubbing section 3 and the second scrubbing section 5 can be connected aerodynamically via the venting duct 13, so that the drying off-gas 1 mentioned below can be guided upwards from the first scrubbing section 3 into the second scrubbing section 5. The height of the venting duct 13 along the vertical direction, more precisely the position height of the upper opening 15, can always be higher than the liquid level height of the scrubbing liquid mentioned below in the collector 4, so that the scrubbing liquid cannot enter from the second scrubbing section 5 via the upper opening 15 into the first scrubbing section 3. The venting duct 13 can be provided with an umbrella-like cap 14 which is held spaced apart from the upper opening 15 of the venting duct 13 above the upper opening 15, so that the scrubbing liquid falling from above the upper opening 15 is prevented from entering into the first scrubbing section 3 via the upper opening 15. At the same time, since the cap 14 is arranged spaced apart from the upper opening 15 of the venting duct 13 and thus forms a lateral gap, the drying off-gas 1 can pass through this lateral gap from the first scrubbing section 3 via the venting duct 13 into the second scrubbing section 5. It is also conceivable that the venting duct 13 can also be integrally configured as part of the collector 4.

[0029] The first scrubbing section 3 can have a tail gas inlet 29 through which the drying off-gas 1 containing ammonium sulphate or ammonium sulphate dust can enter into the ammonium sulphate drying off-gas scrubbing column 100, more precisely into the first scrubbing section 3. In the first scrubbing section 3, the incoming drying off-gas 1 can be guided upwards, for example pumped upwards via a not shown gas pump. The ammonium sulphate washed out of the drying off-gas 1 by the scrubbing liquid together with the scrubbing liquid forms an ammonium sulphate solution which (also continues as scrubbing liquid) collects in the lower part of the first scrubbing section 3 on the basis of gravity. The scrubbing liquid which has a still low ammonium sulphate concentration can continue to be used for scrubbing the newly introduced drying off-gas 1. The tail gas inlet 29 is located in the vertical direction of the first scrubbing section 3 in the middle lower part of the side wall of the first scrubbing section 3, and its position height can be higher than the liquid level height of the scrubbing liquid in the first scrubbing section 3.

[0030] The first washing section 3 can have a first solution circulation system 6 with a first circulation line 8 and a first circulation pump 9 arranged in the first circulation line 8. A lower end of the first circulation line 8 is in fluid communication with the first washing section 3 at a side wall of a lower portion of the first washing section 3. An upper end of the first circulation line 8 leads into an inner space of the first washing section 3 at a side wall of an upper portion of the first washing section 3. The first circulation pump 9 is used to pump the scrubbing liquid in the first washing section 3 from the lower portion of the first washing section 3 to the upper portion of the first washing section 3 via the first circulation line 8. The first solution circulation system 6 further has a first spray distributor 10 for the scrubbing liquid to spray the scrubbing liquid led into the inner space of the first washing section 3 downward in the first washing section 3. Thus, the downward sprayed scrubbing liquid contacts the upward directed dry tail gas 1 and absorbs the ammonium sulfate dust in the dry tail gas 1 into the scrubbing liquid while forming the scrubbing liquid with higher ammonium sulfate concentration. With the scrubbing process thus circulated, more and more ammonium sulfate dust in the dry tail gas 1 is absorbed into the scrubbing liquid, and the ammonium sulfate content in the scrubbing liquid is gradually increased. The first washing section 3 can further have a first overflow line 17 with an interface arranged at a side wall of the lower portion of the first washing section 3, and the overflow line 17 is configured to be always open so that the scrubbing liquid above the interface can directly overflow out of the first washing section 3 via the first overflow line 17 based on its gravity. Alternatively, a first on-off valve (not shown) can be arranged on the first overflow line 17, and when the first on-off valve on the first overflow line 17 is opened, the scrubbing liquid above the interface can overflow into the first overflow line 17 based on its gravity. When the ammonium sulfate content of the scrubbing liquid in the first washing section 3 reaches or exceeds a set threshold value, the scrubbing liquid in the first washing section 3 can be led out of the first washing section 3 via the first overflow line 17 by opening the first on-off valve on the first overflow line 17. The led-out scrubbing liquid, specifically the high-concentration ammonium sulfate solution, is subjected to further concentration crystallization and drying, for example in a desulfurization device not shown, to produce ammonium sulfate solids. It can be provided that the volume of the scrubbing liquid led out of the first washing section 3 can correspond to the volume of the scrubbing liquid led into the first washing section 3 from the second washing section 5 to be further described below, so that the volume of the scrubbing liquid in the first washing section 3 remains substantially unchanged.

[0031] The first washing section 3 can further have a disc-shaped first gas-liquid contactor 11, for example a filler, arranged below the first spray distributor 10, and the upward directed dry tail gas 1 and the downward sprayed scrubbing liquid meet at the first gas-liquid contactor 11 to enable the ammonium sulfate dust in the dry tail gas 1 to be fully contacted with the scrubbing liquid, thereby improving the absorption rate of the ammonium sulfate dust. In addition, the first washing section 3 can further have a first mist eliminator 12 arranged above the first spray distributor 10 to capture the liquid mist droplets containing ammonium sulfate.

[0032] The dried tail gas 1 leaving the first washing section 3 after being washed still contains a certain amount of ammonium sulfate dust, which cannot be directly discharged into the atmospheric environment under increasingly stringent emission standards, and therefore needs to be further treated, i.e., further washed by the second washing section 5 located above the first washing section 3. Similar to the first washing section 3, the second washing section 5 has a second solution circulation system 7 (and thus a second circulation pipeline 19, a second circulation pump 20, and a second spray distributor 21), a second gas-liquid contactor 22, and a second mist eliminator 23, which have the same design and function as the corresponding components in the first washing section 3, and will not be described here.

[0033] The second washing section 5 also has an overflow interface 24 and a second overflow pipeline 26 located on the side wall. The upper end of the second overflow pipeline 26 is in fluid communication with the second washing section 5 at the overflow interface 24, and the lower end of the second overflow pipeline 26 is in fluid communication with the first washing section 3 on the side wall of the first washing section 3. The position of the overflow interface 24 in the vertical direction is lower than the upper opening 15 of the air duct 13 or the position of the lateral gap in the vertical direction. The second overflow pipeline 26 is configured to be always open, so that the washing liquid in the second washing section 5 above the overflow interface 24 directly overflows from the second washing section 5 to the first washing section 3 through the second overflow pipeline 26 based on its gravity. Alternatively, a second on-off valve can be provided on the second overflow pipeline 26. When the ammonium sulfate in the washing liquid in the second washing section 5 exceeds a threshold value or when the washing liquid in the first washing section 3 needs to be supplemented due to being discharged, the washing liquid in the second washing section 5 can be discharged from the second washing section 5 to the first washing section 3 through the second overflow pipeline 26 by opening the second on-off valve on the second overflow pipeline 26 and mixing with the washing liquid therein. The second washing section 5 also has a process water supplement pipeline 25, which can be designed to inject process water into the second washing section 5, for example, to supplement process water into the second washing section 5 corresponding to the volume of washing liquid discharged from the second washing section 5, so as to keep the volume of washing liquid in the second washing section 5 substantially unchanged. The process water can be any liquid that can dissolve ammonium sulfate in the dried tail gas 1 to separate it from the dried tail gas 1.

[0034] The ammonium sulfate dried tail gas washing tower 100 can also have a tail gas outlet 2 arranged above the second washing section 5 for discharging the dried tail gas 1 reaching the emission standard after being further treated by the second washing section 5 to the atmospheric environment.

[0035] Thus, by utilizing the two-stage washing of the ammonium sulfate drying off-gas washing column 100 with the first washing section 3 and the second washing section 5, the ammonium sulfate in the drying off-gas 1 containing ammonium sulfate dust can be washed out from the drying off-gas 1 as much as possible, which on the one hand makes the ammonium sulfate content in the drying off-gas 1 lower, for example, lower than 10 mg / m3, reduces the pollution to the environment, and on the other hand, the ammonium sulfate existing in the washing liquid which is washed out can be further processed, which improves the ammonium sulfate yield.

[0036] Finally, it should be pointed out that the above-mentioned various embodiments are only for understanding and explaining the present application, and do not constitute a limitation on the protection scope of the present application. Modifications can be made on the basis of the above-mentioned embodiments by those skilled in the art, and all these modifications do not depart from the protection scope of the present application.

Claims

1. An ammonium sulfate dry gas tail gas scrubber for ammonia process desulfurization, the ammonium sulfate dry gas tail gas scrubber (100) for scrubbing out ammonium sulfate from a dry gas tail gas (1) containing ammonium sulfate, characterized in that, The ammonium sulfate drying tail gas scrubbing column (100) comprises a first scrubbing section (3) and a second scrubbing section (5), the second scrubbing section (5) is arranged above the first scrubbing section (3) and both are connected in air communication with each other, wherein, in the working state, the drying tail gas (1) containing ammonium sulfate can flow upward through the first scrubbing section (3) and the second scrubbing section (5) in turn, so that the ammonium sulfate in the drying tail gas (1) can be absorbed into the scrubbing liquid in the first scrubbing section (3) and the second scrubbing section (5), wherein the first scrubbing section (3) has a first overflow pipeline (17) designed to be able to guide the scrubbing liquid in the first scrubbing section (3) out of the first scrubbing section (3), and the second scrubbing section (5) has a second overflow pipeline (26) designed to be able to guide the scrubbing liquid in the second scrubbing section (5) into the first scrubbing section (3).

2. The ammonium sulfate dry gas tail gas scrubber column for ammonia process desulfurization according to claim 1, characterized in that, The ammonium sulfate drying tail gas scrubbing column (100) has a disc-shaped collector (4), the first scrubbing section (3) and the second scrubbing section (5) are separated from each other via the collector (4), wherein the collector (4) constitutes the bottom of the second scrubbing section (5) and forms a space for collecting the scrubbing liquid together with the lower part of the sidewall of the second scrubbing section (5).

3. The ammonium sulfate dry gas tail gas scrubber column for ammonia process desulfurization according to claim 2, characterized in that, An air passage (13) is arranged on the collector (4), the first scrubbing section (3) and the second scrubbing section (5) are connected in air communication with each other through the air passage (13), the air passage (13) extends upward from the collector (4) into the second scrubbing section (5), so that the upper opening (15) of the air passage (13) is arranged at a vertical distance from the collector (4).

4. The ammonium sulfate dry gas tail gas scrubber column for ammonia process desulfurization according to claim 3, characterized in that, The air passage (13) is provided with a cap (14), the cap (14) is held at a distance from the upper opening (15) of the air passage (13) above the upper opening (15), so that a lateral gap is formed between the cap (14) and the upper opening (15), through which the drying tail gas (1) can enter the second scrubbing section (5) from the first scrubbing section (3).

5. The ammonium sulphate dry gas tail gas scrubber column for ammonia process desulphurization as claimed in claim 3 wherein, The second scrubbing section (5) has an overflow interface (24) on the sidewall of the second scrubbing section (5), the second overflow pipeline (26) is in fluid communication with the second scrubbing section (5) through the overflow interface (24), wherein the position height of the overflow interface (24) in the vertical direction is lower than the position height of the upper opening (15) in the vertical direction.

6. The ammonium sulfate dry gas tail gas scrubber column for ammonia-based desulfurization according to any one of claims 1 to 5, characterized in that, The first washing section (3) has a first solution circulation system (6) which has a first circulation line (8) and a first circulation pump (9) arranged in the first circulation line (8), the first circulation pump (9) being designed to be able to pump washing liquid in the first washing section (3) via the first circulation line (8) above a tail gas inlet (29) for the introduction of dry tail gas (1) on the first washing section (3), and the first solution circulation system (6) has a first spray distributor (10) which is designed to be able to spray the pumped washing liquid downwards.

7. The ammonium sulfate dry gas tail gas scrubber column for ammonia process desulfurization according to claim 6, characterized in that, The first washing section (3) has a first gas-liquid contactor (11) arranged below the first spray distributor (10), the first gas-liquid contactor (11) being designed to be able to bring upwardly directed dry tail gas (1) into gas-liquid contact with washing liquid sprayed downwards by the first spray distributor (10) at the first gas-liquid contactor (11).

8. The ammonium sulphate dry gas tail gas scrubber column for ammonia based desulphurization as claimed in claim 6 wherein, The first washing section (3) has a first mist eliminator (12) arranged above the first spray distributor (10), the first mist eliminator (12) being designed to be able to capture liquid mist droplets containing ammonium sulfate.

9. The ammonium sulfate dry gas tail gas scrubber column for ammonia process desulfurization according to any one of claims 1 to 5, characterized in that, The second washing section (5) has a second solution circulation system (7) which has a second circulation line (19) and a second circulation pump (20) arranged in the second circulation line (19), the second circulation pump (20) being designed to be able to pump washing liquid in the second washing section (5) upwards via the second circulation line (19), and the second solution circulation system (7) has a second spray distributor (21) which is designed to be able to spray the pumped washing liquid downwards.

10. The ammonium sulfate dry gas tail gas scrubber column for ammonia process desulfurization according to claim 9, characterized in that, The second washing section (5) has a second gas-liquid contactor (22) arranged below the second spray distributor (21), the second gas-liquid contactor (22) being designed to be able to bring upwardly directed dry tail gas (1) into gas-liquid contact with washing liquid sprayed downwards by the second spray distributor (21) at the second gas-liquid contactor (22).

11. The ammonium sulphate dry gas tail gas scrubber column for ammonia based desulphurization as claimed in claim 9 wherein, The second washing section (5) has a second mist eliminator (23) arranged above the second spray distributor (21), the second mist eliminator (23) being designed to be able to capture liquid mist droplets containing ammonium sulfate.

12. The ammonium sulfate dry gas tail gas scrubber column for ammonia process desulfurization according to any one of claims 1 to 5, characterized in that, The second washing section (5) is provided with a process water make-up line (25) which is designed to be able to make up process water in the second washing section (5).

13. The ammonium sulfate dry gas tail gas scrubber column for ammonia process desulfurization according to any one of claims 1 to 5, characterized in that, The first overflow line (17) has a first on-off valve for opening or closing the first overflow line (17), and the second overflow line (26) has a second on-off valve for opening or closing the second overflow line (26).

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