Falling film absorption tower, absorption and removal device and recycling system

Abstract

The utility model provides a falling film absorption tower, an absorption and removal device and a recycling system. The falling film absorption tower comprises a tower body and an upper tube plate group. An absorption cavity is formed in the tower body, a tail gas inlet and an absorption liquid inlet are respectively formed in the top of the outer wall of the tower body, and a tail gas outlet and an absorption liquid outlet are respectively formed in the bottom of the outer wall of the tower body. The upper tube plate group is located in the absorption cavity and fixedly connected with the tower body so as to divide the absorption cavity into a first absorption sub-cavity and a second absorption sub-cavity in the vertical direction, the upper tube plate group is provided with a membrane making channel, and the tail gas inlet is communicated with the tail gas outlet through the first absorption sub-cavity, the membrane making channel and the second absorption sub-cavity in sequence. According to the falling film absorption tower, the contact time of the absorption liquid passing through the film making device and the tail gas is longer, the contact absorption reaction time of hydrogen sulfide and the absorption liquid in the spray tower is greatly prolonged, and the tail gas treatment efficiency of the hydrogen sulfide is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of equipment related to a refined phosphoric acid arsenic removal production process, and in particular to a falling film absorption tower, an absorption and removal device, and a recycling system. Background Art

[0002] As the core power battery material for new energy vehicles and battery energy storage, lithium battery materials will play an extremely important role in the industrialization of new energy. As the second-generation product of lithium batteries, lithium iron phosphate has its own unique and stable physical properties, which is well in line with the safety requirements of the battery itself.

[0003] However, only refined phosphoric acid can be used to produce lithium iron phosphate. Phosphoric acid is the pre-production process of refined phosphoric acid. The dearsenication process is an indispensable step in the production of refined phosphoric acid. The dearsenication processes in the prior art all use hydrogen sulfide to dearsenify, such as patent 202022080271.6. Under normal circumstances, hydrogen sulfide is a colorless, flammable acidic gas with a foul odor at low concentrations, like rotten eggs; at high concentrations, it can paralyze the olfactory nerves so that hydrogen sulfide has no odor. Hydrogen sulfide is highly toxic, and inhaling a small amount of high-concentration hydrogen sulfide can be fatal in a short period of time. Low concentrations of hydrogen sulfide have effects on the eyes, respiratory system and central nervous system. Therefore, it is very important and critical to treat exhaust gas containing hydrogen sulfide.

[0004] At present, the industry uses hydrogen sulfide gas to remove arsenic from phosphoric acid, and sodium sulfide is used as the source of hydrogen sulfide. The principle is that sodium sulfide reacts with phosphoric acid to generate hydrogen sulfide, and the sulfur element in hydrogen sulfide and the arsenic element in phosphoric acid form arsenic trisulfide precipitation, thereby achieving the purpose of arsenic removal. The chemical reaction equation is:

[0005] Na2S+2H3PO4=2NaH2PO4+H2S↑

[0006] 2H3AsO3+3H2S=As2S3↓+6H2O

[0007] 2H3AsO4+5H2S=As2S3↓+8H2O

[0008] However, the above-mentioned hydrogen sulfide tail gas treatment is transported to the spray tower through the blower, which is prone to the safety hazard of a small amount of hydrogen sulfide tail gas overflowing due to poor airtightness; in addition, the time for hydrogen sulfide to contact and absorb the spray liquid, i.e., sodium hydroxide, in the spray tower is short, resulting in a low efficiency of hydrogen sulfide tail gas treatment. Utility Model Content

[0009] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a falling film absorption tower, an absorption and removal device, and a recycling system that can avoid safety hazards and have high hydrogen sulfide tail gas treatment efficiency.

[0010] The purpose of this disclosure is achieved through the following technical solutions:

[0011] A falling film absorption tower, comprising:

[0012] A tower body, wherein an absorption chamber is formed in the tower body, a tail gas inlet and an absorption liquid inlet are respectively arranged at the top of the outer wall of the tower body, and a tail gas outlet and an absorption liquid outlet are respectively arranged at the bottom of the outer wall of the tower body;

[0013] An upper tube sheet group is located in the absorption chamber and fixedly connected to the tower body to divide the absorption chamber into a first absorption chamber and a second absorption chamber in the up-down direction. The upper tube sheet group is provided with a film-forming channel. The tail gas inlet is connected to the tail gas outlet through the first absorption chamber, the film-forming channel and the second absorption chamber in sequence. The absorption liquid inlet is connected to the absorption liquid outlet through the first absorption chamber, the film-forming channel and the second absorption chamber in sequence.

[0014] The tail gas outlet is used to be connected to the ejection vacuum system.

[0015] In one embodiment, the tail gas inlet, the absorption liquid inlet, the tail gas outlet and the absorption liquid outlet are arranged in sequence from top to bottom along the tower body.

[0016] In one embodiment, the falling film absorption tower further comprises a distributor, which is located in the first absorption chamber and fixedly connected to the tower body, and the portion where the first absorption chamber is connected to the absorption liquid outlet is located above the distributor.

[0017] In one embodiment, the portion where the first absorption chamber is connected to the tail gas inlet is located above the distributor.

[0018] In one embodiment, the distributor includes a fixing seat and a plurality of distribution units. The fixing seat is located in the first absorption chamber and is fixedly connected to the tower body. The plurality of distribution units are evenly distributed on the fixing seat.

[0019] In one of the embodiments, the upper tube plate group includes an upper tube plate and a film-forming tube. The upper tube plate is located in the absorption chamber and is fixedly connected to the tower body. The upper tube plate is provided with a plug hole. The film-forming tube passes through the plug hole and is clamped to the upper tube plate. The film-forming channel is opened in the film-forming tube.

[0020] In one embodiment, the film-forming tube is provided with an inlet groove connected to the film-forming channel at the portion exposed to the first absorption chamber, and the direction of the inlet groove connected to the film-forming channel forms a preset angle with the radial direction of the cross section of the film-forming tube.

[0021] In one embodiment, the preset angle is 20° to 70°.

[0022] In one embodiment, each of the inlet grooves extends along the axial direction of the membrane-forming tube.

[0023] In one embodiment, there are multiple inlet grooves, and the multiple inlet grooves are distributed at intervals along the circumference of the film-making tube.

[0024] In one of the embodiments, a snap-in flange is protruding from the portion where the plug hole is connected to the first absorption chamber, and the snap-in flange is snap-held on the film-making tube.

[0025] In one embodiment, the film-making tube includes a film-making tube body and a fixed tube, the film-making tube body passes through the plug hole and is clamped with the upper tube plate, the fixed tube is sleeved on the film-making tube body, the inlet groove is opened in the film-making tube body, and the inlet groove is at least partially exposed to the outside of the film-making tube body; the film-making channel includes a first channel opened in the fixed tube and a second channel opened in the film-making tube body, the first channel is respectively connected to the first absorption chamber, the inlet groove and the second channel, and the second channel is connected to the second absorption chamber.

[0026] An absorption and removal device comprises a tail gas access pipe, an air-sealed pipeline, a circulating absorption liquid tank, an absorption liquid circulation component and a falling film absorption tower as described in any of the above embodiments, wherein the tail gas access pipe is connected to the tail gas inlet, the tail gas outlet is used to be connected to the jet vacuum system through the air-sealed pipeline, the liquid inlet end of the circulating absorption liquid tank is connected to the absorption liquid outlet, and the first liquid outlet end of the circulating absorption liquid tank is connected to the absorption liquid inlet through the absorption liquid circulation component.

[0027] A recycling system includes a first concentrate conveying component, a second concentrate conveying component, a sodium sulfide configuration tank, a jet vacuum system and the above-mentioned absorption and removal device, the second liquid outlet end of the circulating absorption liquid tank is connected to the sodium sulfide configuration tank through the first concentrate conveying component, and the jet vacuum system is connected to the sodium sulfide configuration tank through the second concentrate conveying component; the tail gas outlet is connected to the jet vacuum system through the air-sealed pipeline, and the second liquid outlet end is located below the first liquid outlet end.

[0028] In one embodiment, the jet vacuum system includes a sodium hydroxide solution tank, a venturi ejector, an alkali solution circulation component, an exhaust gas vacuum pipeline and a vacuum buffer tank, the exhaust gas outlet is connected to the vacuum buffer tank through the air seal pipeline, the vacuum buffer tank is connected to the venturi ejector through the exhaust gas vacuum pipeline, the ejection end of the venturi ejector is arranged toward the sodium hydroxide solution tank, the sodium hydroxide solution tank is connected to the concentrated solution conveying component; the two ends of the alkali solution circulation component are respectively connected to the sodium hydroxide solution tank and the venturi ejector.

[0029] In one embodiment, the absorption liquid circulation component includes an absorption liquid circulation pipe and an absorption liquid circulation pump, the circulating absorption liquid tank is connected to the absorption liquid inlet through the absorption liquid circulation pipe, and the absorption liquid circulation pump is arranged on the absorption liquid circulation pipe.

[0030] In one embodiment, the first concentrate delivery component includes a first concentrate delivery pipe and a first concentrate delivery pump, the second liquid outlet is connected to the sodium sulfide configuration tank through the first concentrate delivery pipe, and the first concentrate delivery pump is arranged on the first concentrate delivery pipe.

[0031] In one embodiment, the second concentrate delivery component includes a second concentrate delivery pipe and a second concentrate delivery pump, the jet vacuum system is connected to the sodium sulfide configuration tank through the second concentrate delivery pipe, and the second concentrate delivery pump is arranged on the second concentrate delivery pipe.

[0032] Compared with the prior art, the present invention has at least the following advantages:

[0033] 1. The falling film absorption tower described above has a tail gas inlet and an absorption liquid inlet respectively arranged at the top of the outer wall of the tower body, and a tail gas outlet and an absorption liquid outlet respectively arranged at the bottom of the outer wall of the tower body. The tail gas inlet is connected to the tail gas outlet through the first absorption chamber, the film-forming channel and the second absorption chamber in sequence, and the tail gas outlet is connected to the jet vacuum system. In this way, hydrogen sulfide tail gas can flow in through the tail gas inlet, and be connected to the tail gas outlet through the first absorption chamber, the film-forming channel and the second absorption chamber in sequence, and then flow out through the tail gas outlet. Compared with the traditional method of using a fan to transport air to the spray tower, the safety hazard of hydrogen sulfide tail gas overflowing can be reliably avoided;

[0034] 2. The absorption liquid flows in from the absorption liquid inlet, and passes through the first absorption chamber, the membrane-forming channel and the second absorption chamber in turn, and then flows out through the absorption liquid outlet. The absorption liquid forms an absorption liquid film of a certain thickness through the membrane-forming channel, and can be fully contacted and cooled with the cooling water in the upper tube plate group to cool the exothermic reaction in the absorption process. The exhaust gas passes through the absorption chamber and fully contacts with the absorption liquid, and then flows out through the exhaust gas outlet, so that the contact time between the absorption liquid and the exhaust gas passing through the film-forming device is longer, which greatly prolongs the contact and absorption reaction time of hydrogen sulfide with the absorption liquid in the spray tower, thereby improving the exhaust gas treatment efficiency of hydrogen sulfide. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 A schematic diagram of a falling film absorption tower according to an embodiment;

[0037] Figure 2 for Figure 1 A partial schematic diagram of a falling film absorption tower is shown;

[0038] Figure 3 for Figure 1 A partial schematic diagram of the upper tube sheet group of the falling film absorption tower shown;

[0039] Figure 4 for Figure 1 A schematic diagram of a distributor of a falling film absorption tower is shown;

[0040] Figure 5 A schematic diagram of a film-making tube of an upper tube sheet group of a falling film absorption tower according to another embodiment;

[0041] Figure 6 for Figure 5 A cross-sectional view of the membrane-forming tube shown;

[0042] Figure 7 For passing Figure 6 The schematic diagram of the use of the membrane-making tube shown;

[0043] Figure 8 is a schematic diagram of a recycling system according to an embodiment;

[0044] Fig. 9 for Figure 8 Schematic diagram of the absorption and removal device of the recycling system shown. DETAILED DESCRIPTION

[0045] In order to facilitate the understanding of the present disclosure, the present disclosure will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present disclosure are given in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present disclosure more thoroughly and comprehensively understood.

[0046] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present disclosure. The terms used herein in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0048] In order to better understand the technical solutions and beneficial effects of the present invention, the present invention is further described in detail below in conjunction with specific embodiments:

[0049] like Figures 1 to 3 As shown, a falling film absorption tower 10 of an embodiment includes a tower body 100 and an upper tube plate group 200. An absorption chamber 101 is formed in the tower body 100, a tail gas inlet 102 and an absorption liquid inlet 104 are respectively provided at the top of the outer wall of the tower body 100, and a tail gas outlet 106 and an absorption liquid outlet 108 are respectively provided at the bottom of the outer wall of the tower body 100. The upper tube plate group 200 is located in the absorption chamber 101 and is fixedly connected to the tower body 100 to divide the absorption chamber 101 into a first absorption chamber 1012 and a second absorption chamber 1014 in the up and down directions. The upper tube plate group 200 is provided with a film-forming channel 202. The tail gas inlet 102 is connected to the tail gas outlet 106 through the first absorption chamber 1012, the film-forming channel 202 and the second absorption chamber 1014 in sequence. The absorption liquid inlet 104 is connected to the absorption liquid outlet 108 through the first absorption chamber 1012, the film-forming channel 202 and the second absorption chamber 1014 in sequence. The tail gas outlet 106 is used to be connected to the injection vacuum system 20, so that the tail gas outlet 106 is in a negative pressure state relative to the absorption chamber 101, thereby avoiding the problem of easy leakage of hydrogen sulfide tail gas.

[0050] In the falling film absorption tower 10, since the top of the outer wall of the tower body 100 is respectively provided with a tail gas inlet 102 and an absorption liquid inlet 104, and the bottom of the outer wall of the tower body 100 is respectively provided with a tail gas outlet 106 and an absorption liquid outlet 108, the tail gas inlet 102 is connected to the tail gas outlet 106 through the first absorption chamber 1012, the film-forming channel 202 and the second absorption chamber 1014 in sequence, and the tail gas outlet 106 is connected to the ejection vacuum system 20, so that the hydrogen sulfide tail gas can flow in through the tail gas inlet 102, and is connected to the tail gas outlet 106 through the first absorption chamber 1012, the film-forming channel 202 and the second absorption chamber 1014 in sequence, and then flows out through the tail gas outlet 106, that is, the hydrogen sulfide tail gas is transported by vacuum negative pressure, which is compared with the traditional fan conveying The method of conveying the liquid to the spray tower by wind can reliably avoid the safety hazard of hydrogen sulfide tail gas overflow; the absorption liquid flows in from the absorption liquid inlet 104, and passes through the first absorption chamber 1012, the film-forming channel 202 and the second absorption chamber 1014 in turn, and then flows out through the absorption liquid outlet 108. The absorption liquid forms an absorption liquid film of a certain thickness through the film-forming channel 202, and can be fully contacted and cooled with cooling water in the upper tube plate 210 group to cool the exothermic reaction in the absorption process. The tail gas passes through the absorption chamber and fully contacts with the absorption liquid, and then flows out through the tail gas outlet 106, so that the contact time between the absorption liquid and the tail gas passing through the film-forming device is longer, which greatly prolongs the contact and absorption reaction time of hydrogen sulfide with the absorption liquid in the spray tower, thereby improving the exhaust gas treatment efficiency of hydrogen sulfide.

[0051] like Figure 1 to Figure 2 As shown, in one embodiment, the tail gas inlet 102 , the absorption liquid inlet 104 , the tail gas outlet 106 and the absorption liquid outlet 108 are arranged in sequence from top to bottom along the tower body 100 , so that the absorption liquid can better absorb the hydrogen sulfide tail gas in the absorption chamber 101 .

[0052] like Figure 1 , Figure 2 and Figure 4 As shown, in one embodiment, the falling film absorption tower 10 also includes a distributor 300, which is located in the first absorption chamber 1012 and fixedly connected to the tower body 100, and the portion where the first absorption chamber 1012 is connected to the absorption liquid outlet 108 is located above the distributor 300, so that the absorption liquid flowing into the first absorption chamber 1012 is evenly distributed through the distributor 300, so that the absorption liquid in the absorption chamber 101 can better absorb the hydrogen sulfide tail gas.

[0053] like Figure 1 , Figure 2 and Figure 4As shown, in one embodiment, the portion where the first absorption chamber 1012 is connected to the exhaust gas inlet 102 is located above the distributor 300, so that the contact time between the absorption liquid and the hydrogen sulfide exhaust gas in the absorption chamber 101 is further extended, and the absorption liquid in the absorption chamber 101 can better absorb the hydrogen sulfide exhaust gas.

[0054] like Figure 1 , Figure 2 and Figure 4 As shown, in one embodiment, the uniform distributor 300 includes a fixing base 310 and a plurality of uniform distribution units 320. The fixing base 310 is located in the first absorption chamber 1012 and is fixedly connected to the tower body 100. The plurality of uniform distribution units 320 are evenly distributed on the fixing base 310, so that the uniform distributor 300 can better uniformly distribute the absorption liquid flowing into the first absorption chamber 1012. Specifically, each uniform distribution unit 320 can be welded or glued or integrally formed on the fixing base 310.

[0055] like Figure 1 , Figure 2 and Figure 4 As shown, in one embodiment, the upper tube plate group 200 includes an upper tube plate 210 and a film-forming tube 220. The upper tube plate 210 is located in the absorption chamber 101 and is fixedly connected to the tower body 100. The upper tube plate 210 is provided with a plug hole 212. The film-forming tube 220 passes through the plug hole 212 and is clamped with the upper tube plate 210. The film-forming channel 202 is provided in the film-forming tube 220. In this embodiment, the upper tube plate 210 can be fixed to the tower body 100 by welding or gluing. Of course, the upper tube plate 210 can also be locked to the tower body 100 by screws.

[0056] like Figures 1 to 4 As shown, in one embodiment, the film-forming tube 220 is provided with an inlet groove 222 in communication with the film-forming channel 202 at a portion exposed to the first absorption chamber 1012. Figure 5 and Figure 6 The direction of the inlet groove 222 connected to the film-forming channel 202 is at a preset angle to the radial direction of the cross section of the film-forming tube 220. When the absorption liquid flowing into the first absorption chamber 1012 flows into the film-forming channel 202 through the inlet groove 222, it spirals down along the film-forming channel 202. Figure 7 , so as to better form a liquid film in the membrane-forming channel 202 and fully mix and contact with the hydrogen sulfide exhaust gas, thereby extending the contact and mixing time between the absorption liquid and the hydrogen sulfide exhaust gas and further improving the hydrogen sulfide exhaust gas treatment efficiency.

[0057] like Figure 5As shown, in one embodiment, the preset angle is 20° to 70°, so that the absorption liquid flowing into the first absorption chamber 1012 can flow down the membrane-forming channel 202 in a spiral when flowing into the membrane-forming channel 202 through the inlet groove 222. In this embodiment, the preset angle is 45°.

[0058] like Figure 5 As shown, in one embodiment, each of the inlet grooves 222 extends along the axial direction of the film-forming tube 220, so that the inlet grooves 222 are easy to process and facilitate the absorption liquid flowing into the first absorption chamber 1012 to flow into the film-forming channel 202 through the inlet grooves 222.

[0059] like Figure 5 As shown, in one embodiment, the number of the inlet grooves 222 is multiple, and the multiple inlet grooves 222 are distributed at intervals along the circumference of the film-making tube 220, so that the absorption liquid flowing into the first absorption chamber 1012 can better spiral down along the film-making channel 202 when flowing into the film-making channel 202 through the inlet grooves 222.

[0060] like Figure 2 and Figure 3 As shown, in one embodiment, the insertion hole 212 is connected to the first absorption chamber 1012 and a snap-in flange 2122 is protruding therefrom. The snap-in flange 2122 is clamped on the film-forming tube 220 so that the film-forming tube 220 is more firmly clamped on the upper tube plate 210.

[0061] like Figure 2 and Figure 3 As shown, in one embodiment, the film-making tube 220 includes a film-making tube body 220a and a fixed tube 220b, the film-making tube body 220a passes through the plug hole 212 and is clamped with the upper tube plate 210, the fixed tube 220b is sleeved on the film-making tube body 220a, the inlet groove 222 is opened on the film-making tube body 220a, and the inlet groove 222 is at least partially exposed on the outside of the film-making tube body 220a; the film-making channel 202 includes a first channel opened on the fixed tube 220b and a second channel opened on the film-making tube body 220a, the first channel is respectively connected to the first absorption chamber 1012, the inlet groove 222 and the second channel, and the second channel is connected to the second absorption chamber 1014. In this embodiment, the film-making tube body 220a and the fixed tube 220b are manufactured and formed separately, which increases the difficulty of forming the film-making tube 220.

[0062] like Figure 8 and Fig. 9As shown, the present disclosure also provides an absorption and removal device 30, including a tail gas access pipe 32, an air-sealed pipeline 34, a circulating absorption liquid tank 36, an absorption liquid circulation component 38 and the falling film absorption tower 10 described in any of the above embodiments, the tail gas access pipe 32 is connected to the tail gas inlet 102, the tail gas outlet 106 is used to be connected to the jet vacuum system 20 through the air-sealed pipeline 34, the liquid inlet end of the circulating absorption liquid tank 36 is connected to the absorption liquid outlet 108, and the first liquid outlet end of the circulating absorption liquid tank 36 is connected to the absorption liquid inlet 104 through the absorption liquid circulation component 38, so that the absorption liquid flowing into the circulating absorption liquid tank 36 can be circulated to the absorption liquid inlet 104 again through the absorption liquid circulation component 38 to absorb the hydrogen sulfide tail gas, thereby increasing the number of cycles of the absorption liquid and reducing the use cost of the absorption liquid.

[0063] The above-mentioned absorption and removal device 30, whose falling film absorption tower 10 conveys hydrogen sulfide tail gas by vacuum negative pressure, reliably avoids the safety hazard of hydrogen sulfide tail gas overflow compared with the traditional method of conveying air to the spray tower by a fan; the absorption liquid flows in from the absorption liquid inlet 104, and passes through the first absorption chamber 1012, the film-forming channel 202 and the second absorption chamber 1014 in sequence, and then flows out through the absorption liquid outlet 108. The absorption liquid forms an absorption liquid film of a certain thickness through the film-forming channel 202, and can be fully contacted and cooled with cooling water in the upper tube plate 210 group to cool the exothermic reaction in the absorption process. The tail gas passes through the absorption chamber and is fully contacted with the absorption liquid, and then flows out through the tail gas outlet 106, so that the contact time between the absorption liquid and the tail gas passing through the film-forming device is longer, which greatly prolongs the contact and absorption reaction time of hydrogen sulfide with the absorption liquid in the spray tower, thereby improving the exhaust gas treatment efficiency of hydrogen sulfide.

[0064] The present disclosure also provides a recycling system 40, including a first concentrated liquid conveying component 42, a second concentrated liquid conveying component 44, a sodium sulfide configuration tank 46, a jet vacuum system 20 and the above-mentioned absorption and removal device 30, the second liquid outlet end of the circulating absorption liquid tank 36 is connected to the sodium sulfide configuration tank 46 through the first concentrated liquid conveying component 42, and the jet vacuum system 20 is connected to the sodium sulfide configuration tank 46 through the second concentrated liquid conveying component 44; the tail gas outlet 106 is connected to the jet vacuum system 20 through the air-sealed pipeline 34, the second liquid outlet end is located below the first liquid outlet end, so that the absorption liquid with higher concentration flows into the sodium sulfide configuration tank 46 through the second liquid outlet end for configuration, and at the same time, the sodium sulfide liquid in the sodium sulfide configuration tank 46 can flow into the sodium sulfide configuration tank 46 for configuration, so that the saturated sodium sulfide solution and the purchased sodium sulfide are jointly involved in the preparation of new hydrogen sulfide, so that the sulfur element is recycled and the raw material cost of hydrogen sulfide is greatly reduced.

[0065] In one embodiment, the jet vacuum system 20 includes a sodium hydroxide solution tank 21, a venturi ejector 22, an alkali solution circulation component 23, an exhaust gas vacuum pipeline 24 and a vacuum buffer tank 25. The exhaust gas outlet 106 is connected to the vacuum buffer tank 25 through the air sealing pipeline 34, that is, the gas after being fully absorbed by the absorption liquid in the tower body 100 is discharged through the exhaust gas outlet 106. The vacuum buffer tank 25 is connected to the venturi ejector 22 through the exhaust vacuum pipeline 24. The ejection end of the venturi ejector 22 is arranged toward the sodium hydroxide solution tank 21. The exhaust gas flowing out of the exhaust outlet 106 is ejected into the sodium hydroxide solution tank 21 through the ejection end of the venturi ejector 22 through the vacuum gas flow, so that the exhaust gas is fully contacted and reacted with the sodium hydroxide solution in the sodium hydroxide solution tank 21 to avoid leakage of hydrogen sulfide exhaust gas; the sodium hydroxide solution tank 21 is connected to the concentrated solution conveying component; the two ends of the alkali solution circulation component 23 are respectively connected to the sodium hydroxide solution tank 21 and the venturi ejector 22, which not only reliably avoids the safety hazard of hydrogen sulfide exhaust gas overflow, but also improves the exhaust gas treatment efficiency and reliability of hydrogen sulfide. Furthermore, the alkali liquid circulation component 23 includes an alkali liquid circulation pipe 232 and an alkali liquid circulation pump 234, both ends of the alkali liquid circulation pipe are respectively connected to the sodium hydroxide solution tank 21 and the venturi injector 22, and the alkali liquid circulation pump is arranged on the alkali liquid circulation pipe.

[0066] like Figure 8 and Fig. 9 As shown, in one embodiment, the absorption liquid circulation component 38 includes an absorption liquid circulation pipe 382 and an absorption liquid circulation pump 384, the circulating absorption liquid tank 36 is connected to the absorption liquid inlet 104 through the absorption liquid circulation pipe 382, ​​and the absorption liquid circulation pump 384 is arranged on the absorption liquid circulation pipe 382, ​​so that the absorption liquid can circulate between the circulating absorption liquid tank 36 and the tower body 100.

[0067] like Figure 8 and Fig. 9 As shown, in one embodiment, the first concentrate delivery component 42 includes a first concentrate delivery pipe 422 and a first concentrate delivery pump 424, the second liquid outlet is connected to the sodium sulfide configuration tank 46 through the first concentrate delivery pipe 422, and the first concentrate delivery pump 424 is arranged on the first concentrate delivery pipe 422, so that the absorption liquid with higher concentration flows into the sodium sulfide configuration tank 46 through the second liquid outlet through the first concentrate delivery pipe 422 for configuration.

[0068] like Figure 8 and Fig. 9As shown, in one embodiment, the second concentrate delivery component 44 includes a second concentrate delivery pipe 442 and a second concentrate delivery pump 444, the jet vacuum system 20 is connected to the sodium sulfide configuration tank 46 through the second concentrate delivery pipe 442, and the second concentrate delivery pump 444 is arranged on the second concentrate delivery pipe 442, so that the sodium sulfide liquid in the sodium sulfide configuration tank 46 can flow into the sodium sulfide configuration tank 46 through the second concentrate delivery pipe 442 for configuration.

[0069] Compared with the prior art, the present invention has at least the following advantages:

[0070] 1. The falling film absorption tower 10 described above has a tail gas inlet 102 and an absorption liquid inlet 104 at the top of the outer wall of the tower body 100, and a tail gas outlet 106 and an absorption liquid outlet 108 at the bottom of the outer wall of the tower body 100. The tail gas inlet 102 is connected to the tail gas outlet 106 through the first absorption chamber 1012, the film-forming channel 202 and the second absorption chamber 1014 in sequence, and the tail gas outlet 106 is connected to the ejection vacuum system 20. In this way, hydrogen sulfide tail gas can flow in through the tail gas inlet 102, and be connected to the tail gas outlet 106 through the first absorption chamber 1012, the film-forming channel 202 and the second absorption chamber 1014 in sequence, and then flow out through the tail gas outlet 106. Compared with the traditional method of using a fan to transport air to the spray tower, the safety hazard of hydrogen sulfide tail gas overflow can be reliably avoided;

[0071] 2. The absorption liquid flows in from the absorption liquid inlet 104, and passes through the first absorption chamber 1012, the film-forming channel 202 and the second absorption chamber 1014 in turn, and then flows out through the absorption liquid outlet 108. The absorption liquid forms an absorption liquid film of a certain thickness through the film-forming channel 202, and can be fully contacted and cooled with cooling water in the upper tube plate 210 group to cool the exothermic reaction in the absorption process. The exhaust gas passes through the absorption chamber and fully contacts with the absorption liquid, and then flows out through the exhaust gas outlet 106, so that the contact time between the absorption liquid and the exhaust gas passing through the film-forming device is longer, which greatly prolongs the contact and absorption reaction time of hydrogen sulfide with the absorption liquid in the spray tower, thereby improving the exhaust gas treatment efficiency of hydrogen sulfide.

[0072] The above-mentioned embodiments only express several implementation methods of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the patent of the present disclosure shall be based on the attached claims.

Claims

1. A falling film absorption tower, characterized in that: include: A tower body, wherein an absorption chamber is formed in the tower body, a tail gas inlet and an absorption liquid inlet are respectively arranged at the top of the outer wall of the tower body, and a tail gas outlet and an absorption liquid outlet are respectively arranged at the bottom of the outer wall of the tower body; An upper tube sheet group is located in the absorption chamber and fixedly connected to the tower body to divide the absorption chamber into a first absorption chamber and a second absorption chamber in the up-down direction. The upper tube sheet group is provided with a film-forming channel. The tail gas inlet is connected to the tail gas outlet through the first absorption chamber, the film-forming channel and the second absorption chamber in sequence. The absorption liquid inlet is connected to the absorption liquid outlet through the first absorption chamber, the film-forming channel and the second absorption chamber in sequence. The tail gas outlet is used to be connected to the ejection vacuum system.

2. The falling film absorption tower according to claim 1, characterized in that: The tail gas inlet, the absorption liquid inlet, the tail gas outlet and the absorption liquid outlet are arranged in sequence from top to bottom along the tower body.

3. The falling film absorption tower according to claim 1, characterized in that: It also includes a distributor, which is located in the first absorption chamber and fixedly connected to the tower body. The portion where the first absorption chamber is connected to the absorption liquid outlet is located above the distributor.

4. The falling film absorption tower according to claim 3, characterized in that: The portion where the first absorption chamber communicates with the tail gas inlet is located above the distributor; and / or, The distributor comprises a fixing seat and a plurality of distribution units. The fixing seat is located in the first absorption chamber and is fixedly connected to the tower body. The plurality of distribution units are evenly distributed on the fixing seat.

5. The falling film absorption tower according to claim 1, characterized in that: The upper tube plate group includes an upper tube plate and a film-forming tube. The upper tube plate is located in the absorption chamber and is fixedly connected to the tower body. The upper tube plate is provided with a plug hole. The film-forming tube passes through the plug hole and is clamped with the upper tube plate. The film-forming channel is opened in the film-forming tube.

6. The falling film absorption tower according to claim 5, characterized in that: The film-forming tube is provided with an inlet groove connected to the film-forming channel at the portion exposed to the first absorption chamber, and the direction in which the inlet groove is connected to the film-forming channel forms a preset angle with the radial direction of the cross section of the film-forming tube.

7. The falling film absorption tower according to claim 6, characterized in that: The preset angle is 20° to 70°; and / or, Each of the inlet grooves extends along the axial direction of the film-making tube; and / or, The number of the inlet grooves is multiple, and the multiple inlet grooves are distributed at intervals along the circumference of the film-making tube; and / or, A clamping flange is provided at the part where the plug hole communicates with the first absorption chamber, and the clamping flange is clamped on the film-making tube; and / or, The film-making tube includes a film-making tube body and a fixed tube. The film-making tube body passes through the plug-in hole and is clamped with the upper tube plate. The fixed tube is sleeved on the film-making tube body. The inlet groove is opened in the film-making tube body, and the inlet groove is at least partially exposed to the outside of the film-making tube body. The film-making channel includes a first channel opened in the fixed tube and a second channel opened in the film-making tube body. The first channel is respectively connected to the first absorption chamber, the inlet groove and the second channel, and the second channel is connected to the second absorption chamber.

8. An absorption and removal device, characterized in that: It comprises a tail gas access pipe, an air-sealed pipeline, a circulating absorption liquid tank, an absorption liquid circulation component and a falling film absorption tower according to any one of claims 1 to 7, wherein the tail gas access pipe is connected to the tail gas inlet, the tail gas outlet is used to be connected to the jet vacuum system through the air-sealed pipeline, the liquid inlet end of the circulating absorption liquid tank is connected to the absorption liquid outlet, and the first liquid outlet end of the circulating absorption liquid tank is connected to the absorption liquid inlet through the absorption liquid circulation component.

9. A recycling system, characterized in that: It includes a first concentrate conveying component, a second concentrate conveying component, a sodium sulfide configuration tank, a jet vacuum system and the absorption and removal device according to claim 8, the second liquid outlet end of the circulating absorption liquid tank is connected to the sodium sulfide configuration tank through the first concentrate conveying component, and the jet vacuum system is connected to the sodium sulfide configuration tank through the second concentrate conveying component; the tail gas outlet is connected to the jet vacuum system through the air-sealed pipeline, and the second liquid outlet end is located below the first liquid outlet end.

10. The recycling system according to claim 9, characterized in that: The jet vacuum system comprises a sodium hydroxide solution tank, a venturi ejector, an alkali solution circulation component, an exhaust gas vacuum pipeline and a vacuum buffer tank, wherein the exhaust gas outlet is connected to the vacuum buffer tank through the air-sealed pipeline, and the vacuum buffer tank is connected to the venturi ejector through the exhaust gas vacuum pipeline, and the ejection end of the venturi ejector is arranged toward the sodium hydroxide solution tank, and the sodium hydroxide solution tank is connected to the concentrated solution conveying component; both ends of the alkali solution circulation component are respectively connected to the sodium hydroxide solution tank and the venturi ejector; and / or, The absorption liquid circulation assembly comprises an absorption liquid circulation pipe and an absorption liquid circulation pump, the circulating absorption liquid tank is connected to the absorption liquid inlet through the absorption liquid circulation pipe, and the absorption liquid circulation pump is arranged on the absorption liquid circulation pipe; and / or, The first concentrate delivery component includes a first concentrate delivery pipe and a first concentrate delivery pump, the second liquid outlet is connected to the sodium sulfide configuration tank through the first concentrate delivery pipe, and the first concentrate delivery pump is arranged on the first concentrate delivery pipe; and / or, The second concentrate delivery component includes a second concentrate delivery pipe and a second concentrate delivery pump. The ejection vacuum system is connected to the sodium sulfide configuration tank through the second concentrate delivery pipe. The second concentrate delivery pump is arranged on the second concentrate delivery pipe.

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