Claus tail gas purification system

Abstract

The utility model relates to the technical field of coking tail gas treatment, in particular to a Claus tail gas purification system. Comprising a residual ammonia water tank, a tar remover, a washer, a wastewater heat exchanger and an ammonia still which are sequentially connected through pipelines, the dephlegmator is fixedly connected to the top of the ammonia still; a pipeline for connecting the tar remover and the scrubber extends into the scrubber, a spray head is arranged at the end part of the pipeline, and the spraying direction of the spray head is opposite to the tail gas direction; and the scrubber adopts cyclone separation for demisting. The device can effectively purify Claus tail gas and reduce corrosion of an ammonia water system and a coal gas system.

Description

Technical Field

[0001] The utility model relates to the technical field of coking tail gas treatment, and specifically relates to a Claus tail gas purification system. Background Technique

[0002] The AS desulfurization process is one of the common processes in coking production. In this process flow, the tail gas of the Claus system cannot be directly discharged into the atmosphere and needs to enter the raw gas pipeline before the primary cooler and circulate. Since the temperature of this tail gas is high, directly entering the raw gas pipeline will affect the flow state of the gas-liquid mixture in the pipeline. Therefore, a tail gas cooler is usually set on the gas suction pipeline to cool the tail gas by spraying ammonia water, and then the ammonia water returns to the ammonia water tank.

[0003] Due to the presence of impurities such as SO2, SO3, and H2S in the tail gas, through the spraying of ammonia water, the impurities are washed by the ammonia water, and the corrosive medium in the gas is reduced. However, due to the presence of free acid in the ammonia water, after the ammonia water returns to the ammonia water tank, it will cause corrosion to the entire ammonia water system. At the same time, after the gas is washed by the ammonia water, if the reaction is incomplete or the liquid is entrained into the gas system, it will cause corrosion to the gas system. Content of the Utility Model

[0004] To overcome the deficiencies of the above-mentioned prior art, the utility model provides a Claus tail gas purification system to purify the Claus tail gas and reduce the corrosion of the ammonia water system and the gas system.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A Claus tail gas purification system includes a surplus ammonia water tank, a de-tarmer, a scrubber, a waste heat exchanger, and an ammonia distillation tower connected in sequence through pipelines; it also includes a partial condenser, and the partial condenser is fixedly connected to the top of the ammonia distillation tower; the pipeline connecting the de-tarmer and the scrubber extends into the scrubber, and a spray head is provided at the end of the pipeline, and the spraying direction of the spray head is opposite to the direction of the tail gas; the scrubber uses cyclone separation to remove mist.

[0007] Further, the surplus ammonia water tank includes a tank body, a first ammonia water inlet, a partition board, and a first ammonia water outlet; the first ammonia water inlet and the first ammonia water outlet are fixedly connected to the side wall of the tank body, and the partition board is vertically fixedly connected inside the tank body.

[0008] Further, the de-tarmer includes a second ammonia water inlet, a head, a cylinder body, a fiber bed coalescence layer, a corrugated plate separation layer, a light tar discharge port, a second ammonia water outlet, and a heavy tar discharge port. The cylinder body is arranged horizontally, and the heads are fixedly connected to both ends of the cylinder body; the fiber bed coalescence layer and the corrugated plate separation layer are arranged inside the cylinder body, and the light tar discharge port and the heavy tar discharge port are fixedly connected to the cylinder wall of the cylinder body; the second ammonia water inlet and the second ammonia water outlet are respectively fixedly connected to the heads at both ends.

[0009] Further, the scrubber includes a tail gas inlet pipe, a tail gas outlet pipe, a scrubber cylinder body, a third ammonia water inlet, a power wave nozzle, a scrubber partition plate, a tapered pipe, a straight pipe and a third ammonia water outlet. The tail gas inlet pipe is divided into a vertical section, a bent section and a horizontal section. The third ammonia water inlet is fixedly connected to the vertical section and is connected to the power wave nozzle through a pipeline. The power wave nozzle is arranged in the vertical section and the nozzle faces upward. The horizontal section is connected to the side wall of the scrubber cylinder body and tangentially enters the scrubber cylinder body. The scrubber partition plate and the tapered pipe are fixedly connected inside the scrubber cylinder body, and the straight pipe is fixedly connected to the bottom of the tapered pipe. The third ammonia water outlet is fixedly connected to the side wall of the scrubber cylinder body, and the tail gas outlet pipe is fixedly connected to the top of the scrubber cylinder body.

[0010] Further, the ammonia distillation tower includes a tower body, and a wastewater outlet, a steam inlet, an alkali liquor inlet and a fourth ammonia water inlet are provided on the tower body.

[0011] Further, the partial condenser uses a fixed tube sheet heat exchanger, is connected to the ammonia distillation tower through a flange at the lower part, and an ammonia gas outlet is provided at the upper part.

[0012] Further, the wastewater outlet of the ammonia distillation tower is connected to the inlet pipeline of the wastewater heat exchanger, and a wastewater pump is provided on the connected pipeline.

[0013] Further, an ammonia water pump is provided on the pipeline connecting the scrubber and the wastewater heat exchanger.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0015] 1. The present utility model includes a surplus ammonia water tank, a tar remover, a scrubber, a wastewater heat exchanger and an ammonia distillation tower which are connected in sequence through pipelines. The ammonia water is purified by the surplus ammonia water tank and the tar remover. After the purified ammonia water is used, a large flux of ammonia water is directly used to absorb the tail gas and then directly enters the ammonia distillation tower for distillation, reducing the corrosion of the ammonia water system caused by cyclic absorption. Moreover, the scrubber uses cyclone separation and demisting to reduce the liquid entrained in the tail gas, thereby reducing the corrosion of the subsequent gas system.

[0016] 2. The tar remover of the present utility model is provided with a fiber bed coalescence layer and a corrugated plate separation layer. The small tar droplets entrained inside the pressurized ammonia water are gradually coalesced into larger droplets through the fiber bed coalescence layer and enter the corrugated plate separation layer. The larger droplets are coalesced into large droplets. After leaving the corrugated plate separation layer, the large droplets of tar settle. The heavy tar settles downward and is discharged along the heavy tar discharge outlet, and the light tar floats upward and is discharged through the light tar discharge outlet. After sedimentation, the heavy tar and the light tar are separated, ensuring the stable operation of the subsequent system.

[0017] 3. The scrubber of the present utility model uses a power wave nozzle. Ammonia water is sprayed through the power wave nozzle and contacts the tail gas countercurrently to complete the absorption reaction and reduce the temperature. The ammonia water sprayed by the power wave nozzle contacts the tail gas reversely, and the gas-liquid two-phase collides at high speed in the reverse direction. When the momentum of the gas-liquid two-phase reaches equilibrium, a highly turbulent foam zone is formed, with a large contact surface area, and these contact surfaces are continuously and rapidly updated, achieving the effect of efficient absorption. The use of a large-hole power wave nozzle ensures that the equipment is not blocked during the spraying process of ammonia water and the reaction is complete.

[0018] 4. The tail gas inlet pipe of the scrubber of the present utility model enters the scrubber cylinder tangentially. The cone tube is fixedly connected inside the scrubber cylinder, the straight pipe is fixedly connected to the bottom of the cone tube, and the tail gas outlet pipe is fixedly connected to the top of the scrubber cylinder. After the absorption is completed, the tail gas enters the scrubber tangentially. The gas rotates downward along the tangent direction, and the airflow changes from linear motion to circular motion. During the rotation, a centrifugal force is generated, and the liquid droplets are thrown towards the cylinder wall and flow downward by gravity to the bottom cone tube, entering the lower space of the scrubber. When the rotating downward airflow reaches the cone tube, it converges towards the center due to the conical contraction. When it reaches the lower part of the cone tube, the rotation direction of the gas changes from downward to upward and continues to flow in a spiral manner, entering the tail gas outlet pipe. The tail gas that removes impurities, droplets and reduces the temperature enters the raw coal gas pipeline before the primary cooler and circulates, reducing tail gas emissions, achieving the environmental protection purpose, reducing the liquid entrained by the tail gas, and reducing the corrosion of the subsequent gas system. Description of the Drawings

[0019] Figure 1 It is the front view of the structural schematic and process principle of the present utility model.

[0020] Figure 2 is Figure 1 A-A sectional view of

[0021] In the figure: 1 - First ammonia water pump; 2 - Surplus ammonia water tank, 21 - Tank body, 22 - First ammonia water inlet, 23 - Partition board, 24 - First ammonia water outlet; 3 - Tar separator, 31 - Second ammonia water inlet, 32 - Head, 33 - Cylinder body, 34 - Fiber bed coalescence layer, 35 - Corrugated plate separation layer, 36 - Light tar discharge port, 37 - Second ammonia water outlet, 38 - Heavy tar discharge port; 4 - Scrubber, 41 - Vertical section, 42 - Bend section, 43 - Horizontal section, 44 - Power wave nozzle, 45 - Third ammonia water inlet, 46 - Tail gas outlet pipe, 47 - Cover plate, 48 - Scrubber cylinder body, 49 - Cone tube, 410 - Straight pipe, 411 - Third ammonia water outlet, 412 - Scrubber partition board, 413 - Scrubber head, 414 - First vent port, 415 - Second vent port, 416 - Skirt support; 5 - Second ammonia water pump; 6 - Waste water heat exchanger; 7 - Partial condenser; 8 - Ammonia distillation tower, 81 - Tray, 82 - Waste water outlet, 83 - Steam inlet, 84 - Alkali liquid inlet, 85 - Fourth ammonia water inlet; 9 - Waste water pump Detailed Embodiment

[0022] Embodiments of the present utility model will be described in detail below. To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are only a part of the embodiments of the present utility model, rather than all of them. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present utility model and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the scope of protection of the present utility model.

[0023] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0024] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and defined, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements.

[0025] For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0026] In the description of the present utility model, it should be noted that the terms used here are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0027] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present utility model. At the same time, it should be clear that for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific values should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar reference numerals and letters denote similar items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0028] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Without otherwise stating, the above terms have no special meaning, and thus, should not be construed as limiting the protection scope of the present utility model.

[0029]

Embodiment

[0030] As Figure 1 , Figure 2 shown, a Claus tail gas purification system includes a first ammonia water pump 1, a residual ammonia water tank 2, a de-tarring device 3, a scrubber 4, a second ammonia water pump 5, a waste water heat exchanger 6, a partial condenser 7, an ammonia stripping tower 8, and a waste water pump 9.

[0031] The residual ammonia water tank 2 includes a tank body 21, a first ammonia water inlet 22, a partition plate 23, and a first ammonia water outlet 24. The first ammonia water inlet 22 is fixedly connected to the side wall of the tank body 21 and is located on the right side. The first ammonia water outlet 24 is fixedly connected to the side wall of the tank body 21 and is located on the left side. The partition plate 23 is vertically fixedly connected inside the tank body 21. Ammonia water enters the tank body on the right side of the partition plate 23, and after sedimentation, it passes through the partition plate 23 and enters the tank body on the left side of the partition plate 23 to remove some impurities such as tar.

[0032] The de-tarring device 3 includes a second ammonia water inlet 31, a head 32, a cylinder body 33, a fiber bed coalescence layer 34, a corrugated plate separation layer 35, a light tar discharge port 36, a second ammonia water outlet 37, and a heavy tar discharge port 38. The cylinder body 33 is a horizontal cylinder, and two heads 32 are respectively fixedly connected to the left and right ends of the cylinder body 33. The fiber bed coalescence layer 34 and the corrugated plate separation layer 35 are fixedly connected inside the cylinder body 33. The second ammonia water inlet 31 is fixedly connected to the right head 32, the second ammonia water outlet 37 is fixedly connected to the left head 32, the light tar discharge port 36 is fixedly connected to the upper part of the cylinder wall of the cylinder body 33, and the heavy tar discharge port 38 is fixedly connected to the lower part of the cylinder body 33.

[0033] The small tar droplets entrained inside the ammonia water gradually coalesce into larger droplets through the fiber bed coalescing layer 34 and enter the corrugated plate separation layer 35. The larger droplets coalesce into big droplets. After leaving the corrugated plate separation layer 35, the big droplet tar settles. The heavy tar settles downward and is discharged along the heavy tar discharge port 38. The light tar floats upward and is discharged through the light tar discharge port 36. The ammonia water from which the tar has been removed is discharged from the second ammonia water outlet 37.

[0034] The first ammonia water outlet 24 is connected to the inlet pipe of the first ammonia water pump 1, and the outlet of the first ammonia water pump 1 is connected to the pipe of the second ammonia water inlet 31.

[0035] The scrubber 4 includes a tail gas inlet pipe, which is divided into a vertical section 41, a bent section 42 and a horizontal section 43. It also includes a power wave spray head 44, a third ammonia water inlet 45, a tail gas outlet pipe 46, a cover plate 47, a scrubber cylinder body 48, a conical pipe 49, a straight pipe 410, a third ammonia water outlet 411, a scrubber partition plate 412, a scrubber head 413, a first vent port 414, a second vent port 415 and a skirt support 416.

[0036] The third ammonia water inlet 45 is fixedly connected to the vertical section 41 and is connected to the power wave spray head 44 through a pipe. The power wave spray head 44 is arranged inside the vertical section 41 and the spray head faces upward. The horizontal section 43 is connected to the side wall of the scrubber cylinder body 48 and tangentially enters the scrubber cylinder body 48. The scrubber head 413 is fixedly connected to the bottom of the scrubber cylinder body 48, the cover plate 47 is fixedly connected to the top surface of the scrubber cylinder body 48, and the scrubber head 413 is fixedly connected to the skirt support 416. The tail gas outlet pipe 46 is coaxial with the scrubber cylinder body 48, is vertically fixedly connected to the center of the cover plate 47, and the lower part extends into the scrubber cylinder body 48.

[0037] The conical pipe 49 is fixedly connected to the inner wall of the scrubber cylinder body 48, and the straight pipe 410 is fixedly connected to the bottom of the conical pipe 49. The scrubber partition plate 412 is vertically fixedly connected inside the scrubber cylinder body 48 and is fixedly connected to the scrubber head 413. The first vent port 414 and the second vent port 415 are fixedly connected to the scrubber head 413. The first vent port 414 is located at the bottom end of the scrubber head 413, and the second vent port 415 is located between the scrubber partition plate 412 and the scrubber cylinder body 48.

[0038] The third ammonia water outlet 411 is fixedly connected to the lower part of the scrubber cylinder body 48. The third ammonia water outlet 411 is connected to the inlet pipe of the second ammonia water pump 5, and the outlet of the second ammonia water pump 5 is connected to the waste heat exchanger 6 through a pipe. The third ammonia water inlet 45 is connected to the second ammonia water outlet 37 of the de-tarmer 3 through a pipe.

[0039] At the straight pipe section 41, ammonia water is sprayed through the dynamic wave nozzle 44 and contacts the tail gas in countercurrent to complete the absorption reaction. After the ammonia water passes through cyclone separation and the purified tail gas is demisted, it is discharged upward. The ammonia water enters the bottom of the cylinder through the scrubber cylinder body 48 and flows into the left side of the scrubber partition 412 after sedimentation, and then flows out through the third ammonia water outlet 411.

[0040] The ammonia distillation tower 8 includes a tower body. A tray 81 is arranged inside the tower body. A waste water outlet 82, a steam inlet 83, a lye inlet 84 and a fourth ammonia water inlet 85 are arranged on the tower body. The waste water outlet 82 is connected to the inlet pipeline of the waste water pump 9. The outlet of the waste water pump 9 is connected to the inlet pipeline of the waste water heat exchanger 6. The waste water heat exchanger 6 is connected to the pipeline of the fourth ammonia water inlet 85. The waste water heat exchanger 6 uses the waste water discharged from the ammonia distillation tower 8 to heat the ammonia water.

[0041] The partial condenser 7 adopts a fixed tube sheet heat exchanger and is connected to the top of the ammonia distillation tower 8 through a flange at the lower part. An ammonia gas outlet 71 is arranged at the top of the partial condenser 7.

[0042] The working principle and process of the present utility model are as follows:

[0043] The ammonia water enters the right side of the remaining ammonia water tank partition 23. After sedimentation, it enters the left side of the partition 23 through the partition 23, removing some impurities such as tar. It is sent to the de-tarmer 3 by the ammonia water pump 1. The tar droplets entrained inside the pressurized ammonia water are gradually coalesced into larger droplets through the fiber bed coalescence layer 34 and enter the corrugated plate separation layer 35. The larger droplets are coalesced into large droplets. After leaving the corrugated plate separation layer 35, the large droplet tar undergoes sedimentation. The heavy tar settles downward and is discharged along the heavy tar discharge port 38. The light tar floats upward and is discharged through the light tar discharge port 36. The ammonia water from which the tar has been removed is discharged through the second ammonia water outlet 37.

[0044] At the vertical section 41 of the purified ammonia water, the ammonia water is sprayed through the dynamic wave nozzle 44 and contacts the tail gas in countercurrent to complete the absorption reaction and reduce the temperature. The ammonia water sprayed by the dynamic wave nozzle contacts the tail gas in reverse. The gas-liquid two-phase collides at high speed in reverse. When the momentum of the gas-liquid two-phase reaches equilibrium, a highly turbulent foam zone is formed. The contact surface area is large, and these contact surfaces are continuously and rapidly updated, achieving the effect of efficient absorption. By using a large-hole dynamic wave nozzle, it is ensured that the equipment is not blocked during the spraying process of the ammonia water.

[0045] After the tail gas is completely absorbed, it tangentially enters the scrubber cylinder body 48. The gas rotates downward tangentially, and the air flow changes from linear motion to circular motion. Centrifugal force is generated during the rotation process, and the liquid droplets are thrown towards the cylinder wall and flow downward by gravity to the bottom cone pipe 49, entering the lower space of the scrubber. When the rotating downward air flow reaches the cone pipe 49, it converges towards the center due to the conical contraction. When it reaches the lower part of the cone pipe 49, the rotation direction of the gas changes from downward to upward and continues to flow in a spiral manner, entering the straight pipe 410. The tail gas that removes impurities and droplets and cools down enters the raw coal gas pipeline before the primary cooler, circulates, reduces tail gas emissions, and achieves the environmental protection purpose.

[0046] Ammonia water deposits in the lower part of the scrubber, and impurities such as tar are discharged through the first vent 414. The scrubber partition plate 412 functions as a liquid seal. The ammonia water overflows along the scrubber partition plate 412 and then flows into the left side of the scrubber partition plate 412. It is sent to the waste heat exchanger 6 by the second ammonia water pump 5 for heat exchange and then enters the ammonia distillation tower 8. After mixing with the lye, the fixed ammonium salts are decomposed. Under the action of the lower steam, ammonia gas enters the partial condenser 7, and the ammonia gas enters the next process section. Impurities such as asphalt at the bottom of the ammonia distillation tower are discharged through the vent. The high-temperature ammonia distillation wastewater is sent to the waste heat exchanger 6 by the wastewater pump 9 for heat exchange with ammonia water, and then further cooled and sent to the sewage treatment system.

[0047] This utility model utilizes the purified ammonia water. After directly absorbing the tail gas with a large flux of ammonia water, it directly enters the ammonia distillation tower 8 for distillation, reducing the corrosion of the ammonia water system caused by cyclic absorption. The ammonia water passes through the fiber bed coalescence layer 34 and the corrugated plate separation layer in the tar remover 3 and undergoes sedimentation to separate heavy tar and light tar, ensuring the stable operation of the subsequent system. The scrubber 4 uses a dynamic wave spray head 44, reducing blockage and ensuring complete reaction. It also uses cyclone demisting to reduce the liquid entrained in the tail gas and reduce the corrosion of the subsequent coal gas system. This utility model can effectively purify the Claus tail gas and simultaneously reduce the corrosion of the ammonia water system and the coal gas system.

[0048] As described above, only some specific embodiments of the present utility model are provided. The protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution and the inventive concept of the present utility model, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present utility model.

Claims

1. A Claus tail gas purification system, characterized in that: It includes a residual ammonia water tank, a de-tarring device, a scrubber, a waste water heat exchanger and an ammonia distillation tower connected in sequence through pipelines; It also includes a partial condenser, and the partial condenser is fixedly connected to the top of the ammonia distillation tower; The pipeline connecting the de-tarring device and the scrubber extends into the scrubber, and a nozzle is provided at the end of the pipeline, and the spraying direction of the nozzle is opposite to the direction of the tail gas; The scrubber uses cyclone separation for demisting.

2. The Claus tail gas purification system according to claim 1, characterized in that: The residual ammonia water tank includes a tank body, a first ammonia water inlet, a partition board and a first ammonia water outlet; The first ammonia water inlet and the first ammonia water outlet are fixedly connected to the side wall of the tank body, and the partition board is vertically fixedly connected inside the tank body.

3. The Claus tail gas purification system according to claim 1, characterized in that: The de-tarring device includes a second ammonia water inlet, a head, a cylinder body, a fiber bed coalescence layer, a corrugated plate separation layer, a light tar discharge port, a second ammonia water outlet, and a heavy tar discharge port; The cylinder body is arranged horizontally, and the heads are fixedly connected to both ends of the cylinder body; the fiber bed coalescence layer and the corrugated plate separation layer are arranged inside the cylinder body, the light tar discharge port and the heavy tar discharge port are fixedly connected to the cylinder wall of the cylinder body; the second ammonia water inlet and the second ammonia water outlet are respectively fixedly connected to the heads at both ends.

4. The Claus tail gas purification system according to claim 1, characterized in that: The scrubber includes a tail gas inlet pipe, a tail gas outlet pipe, a scrubber cylinder body, a third ammonia water inlet, a power wave nozzle, a scrubber partition board, a cone pipe, a straight pipe and a third ammonia water outlet; The tail gas inlet pipe is divided into a vertical section, a bent section and a horizontal section. The third ammonia water inlet is fixedly connected to the vertical section and is connected to the power wave nozzle through a pipeline. The power wave nozzle is arranged in the vertical section and the nozzle faces upward; the horizontal section is connected to the side wall of the scrubber cylinder body and tangentially enters the scrubber cylinder body; The scrubber partition board and the cone pipe are fixedly connected inside the scrubber cylinder body, and the straight pipe is fixedly connected to the bottom of the cone pipe; the third ammonia water outlet is fixedly connected to the side wall of the scrubber cylinder body, and the tail gas outlet pipe is fixedly connected to the top of the scrubber cylinder body.

5. The Claus tail gas purification system according to claim 1, characterized in that: The ammonia distillation tower includes a tower body, and a waste water outlet, a steam inlet, an alkali liquor inlet and a fourth ammonia water inlet are provided on the tower body.

6. The Claus tail gas purification system according to claim 1, characterized in that: The partial condenser adopts a fixed tube sheet heat exchanger, is connected to the ammonia distillation tower through a flange at the lower part, and has an ammonia gas outlet at the upper part.

7. The Claus tail gas purification system according to claim 1, characterized in that: The waste water outlet of the ammonia distillation tower is connected to the inlet pipeline of the waste water heat exchanger, and a waste water pump is provided on the connected pipeline.

8. The Claus tail gas purification system according to claim 1, characterized in that: An ammonia water pump is provided on the pipeline connecting the scrubber and the waste water heat exchanger.

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