Energy-saving and environment-friendly fuming sulfuric acid tail gas absorption device

Abstract

The utility model belongs to the technical field of tail gas treatment, and particularly discloses an energy-saving and environment-friendly fuming sulfuric acid tail gas absorption device which comprises an absorption tower, a fuming sulfuric acid tail gas inlet pipe and an absorption liquid conveying pipe, the top end of the absorption tower is connected with an exhaust pipe, and the bottom end of the absorption tower is connected with an absorption liquid discharge pipe. One end of the fuming sulfuric acid tail gas inlet pipe is connected with the lower side of the side wall of the absorption tower, a preheating mechanism is arranged on a pipeline of the fuming sulfuric acid tail gas inlet pipe, and the end, close to the absorption tower, of the absorption liquid conveying pipe is connected with three conveying branch pipes; an atomizing nozzle, a conical spraying cover and a spraying disc are respectively arranged in the absorption tower from top to bottom, and the atomizing nozzle, the conical spraying cover and the spraying disc are respectively connected with three conveying branch pipes. Before the tail gas enters the absorption tower, the tail gas passes through the preheating mechanism, the multi-stage spraying absorption tower is adopted, and the contact area and the contact time of the tail gas and the absorption liquid are increased and prolonged by increasing the spraying layer number and optimizing the spraying liquid distribution.

Description

Technical Field

[0001] The utility model relates to the technical field of tail gas treatment, in particular to an energy-saving and environment-friendly oleum tail gas absorption device. Background Art

[0002] Fuming sulfuric acid, also known as fuming H2SO4, is a high-concentration sulfuric acid widely used in the chemical industry, such as the preparation of dyes and petroleum refining catalysts.

[0003] However, during the production of oleum, tail gas emissions have become a significant environmental concern. These gases primarily contain unreacted sulfur dioxide, sulfur trioxide, and other harmful substances, as well as water vapor. Direct release into the atmosphere would cause severe environmental pollution, potentially leading to acid rain and deteriorating air quality. Existing equipment currently available for treating oleum tail gas suffers from inefficient absorption and high energy consumption, which is inconsistent with environmentally friendly production practices. Utility Model Content

[0004] The purpose of the utility model is to provide an energy-saving and environmentally friendly oleum tail gas absorption device to solve the problem of low absorption efficiency of the devices for treating oleum tail gas on the market mentioned in the background art.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solution: an energy-saving and environmentally friendly oleum tail gas absorption device, comprising:

[0006] An absorption tower, wherein the top end of the absorption tower is connected to an exhaust pipe, and the bottom end of the absorption tower is connected to an absorption liquid discharge pipe;

[0007] an oleum tail gas inlet pipe, one end of which is connected to the lower side of the side wall of the absorption tower, and a preheating mechanism is provided on the pipe of the oleum tail gas inlet pipe;

[0008] An absorption liquid delivery pipe, wherein a suction pump is provided on the pipeline of the absorption liquid delivery pipe, and one end of the absorption liquid delivery pipe close to the absorption tower is connected to three delivery branches. An atomizing nozzle, a conical spray hood and a spray plate are provided inside the absorption tower from top to bottom, and the atomizing nozzle, the conical spray hood and the spray plate are respectively connected to the three delivery branches;

[0009] Among them, the conical spray hood is hollow and has a slot at the top. The atomizing nozzle is located just above the slot at the top of the conical spray hood. The conical spray hood and spray plate are both cavity-shaped, and spray holes are evenly opened on the lower surfaces of the conical spray hood and the spray plate.

[0010] Preferably, the preheating mechanism includes a hollow preheating chamber with openings at both ends, the two openings being an air inlet and an air outlet respectively, the openings at both ends of the preheating chamber being connected to the fuming sulfuric acid tail gas inlet pipe, a temperature controller being provided on the upper side of the preheating chamber, and a resistance heating wire being provided inside the preheating chamber and being electrically connected to the temperature controller.

[0011] Preferably, a temperature detector is provided on the pipeline of the oleum tail gas inlet pipe, and the temperature detector is located on a side close to the gas outlet.

[0012] Preferably, the outer wall diameter of the spray plate is smaller than the inner diameter of the absorption tower, and the outer wall of the spray plate is connected to the inner wall of the absorption tower through a support rod, the outer edge of the conical spray hood is connected to the inner wall of the absorption tower, and a leakage groove is provided at the outer edge of the conical spray hood.

[0013] Preferably, it also includes a reflux pipe, which is located outside the absorption tower, and the upper end of the reflux pipe is connected to the side wall of the exhaust pipe, and the lower end of the reflux pipe is connected to the lower side of the side wall of the absorption tower, and a suction fan is provided on the pipeline of the reflux pipe.

[0014] Preferably, the lower surface of the absorption tower is provided with supporting legs.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] Before the tail gas enters the absorption tower, it is first heated to a certain temperature (the optimum temperature for converting sulfur dioxide to sulfur trioxide is 400-500 degrees Celsius) through a preheating mechanism to increase the conversion rate of sulfur trioxide in the tail gas, because SO3 is more likely to react with the absorption liquid at high temperature, avoiding its direct emission in gaseous form.

[0017] The absorption tower adopts multi-stage spraying, which increases the contact area and contact time between the tail gas and the absorption liquid by increasing the number of spray layers and optimizing the distribution of the spray liquid. When the fuming sulfuric acid tail gas enters the spray absorption tower, it will first encounter the first spray layer. The spray liquid is sprayed down in the form of mist and fully contacts with the rising tail gas. The acidic gases such as SO2 and SO3 in the tail gas react with the alkaline components in the spray liquid to generate corresponding salts and water. As the tail gas continues to rise, it will pass through the subsequent spray layers in turn. With each layer it passes, the concentration of pollutants in the tail gas will be further reduced, effectively improving the tail gas absorption efficiency.

[0018] The exhaust gas treated by the absorption tower is circulated and absorbed by a suction fan, and the treated exhaust gas is mixed with the untreated exhaust gas at the inlet of the absorption tower. Since the circulating exhaust gas has been preliminarily treated, its pollutant concentration is relatively low, but it still contains a certain amount of incompletely absorbed pollutants. After being mixed with the fresh exhaust gas through the gas mixing mechanism, the total volume of the gas increases, but the pollutant concentration is diluted. The mixed gas enters the spray absorption tower again for absorption treatment. In the tower, the mixed gas continues to contact and react with the spray liquid, and finally, it is discharged from the absorption tower through the discharge port. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of the utility model;

[0020] Figure 2 This is a schematic diagram of the internal structure of the preheating mechanism of the utility model;

[0021] Figure 3 This is a schematic diagram of the internal structure of the absorption tower of the utility model.

[0022] In the figure: 1. Absorption tower; 2. Absorption liquid discharge pipe; 3. Exhaust pipe; 4. Oleum tail gas inlet pipe; 5. Preheating chamber; 6. Resistance heating wire; 7. Temperature controller; 8. Temperature detector; 9. Absorption liquid delivery pipe; 10. Delivery branch pipe; 11. Suction pump; 12. Atomizing nozzle; 13. Conical spray hood; 14. Leakage trough; 15. Spray plate; 16. Support rod; 17. Reflux pipe. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0025] Example 1:

[0026] See also Figure 1-3The utility model provides a technical solution: a tail gas absorption device, comprising: an absorption tower 1, an oleum tail gas inlet pipe 4, and an absorption liquid delivery pipe 9;

[0027] The top of the absorption tower 1 is connected to the exhaust pipe 3, the bottom of the absorption tower 1 is connected to the absorption liquid discharge pipe 2, one end of the fuming sulfuric acid tail gas intake pipe 4 is connected to the lower side of the side wall of the absorption tower 1, the pipeline of the fuming sulfuric acid tail gas intake pipe 4 is provided with a preheating mechanism, the pipeline of the absorption liquid delivery pipe 9 is provided with a suction pump 11, the absorption liquid delivery pipe 9 is connected to one end close to the absorption tower 1 with three delivery branches 10, the interior of the absorption tower 1 is respectively from top to bottom. An atomizing nozzle 12, a conical spray hood 13 and a spray plate 15 are provided. The atomizing nozzle 12, the conical spray hood 13 and the spray plate 15 are respectively connected to the three delivery branches 10. The conical spray hood 13 is hollow and has a slot at the top. The atomizing nozzle 12 is located just above the slot at the top of the conical spray hood 13. The conical spray hood 13 and the spray plate 15 are both cavity-shaped, and spray holes are evenly opened on the lower surfaces of the conical spray hood 13 and the spray plate 15.

[0028] Analysis of the above content: When in use, the oleum tail gas to be treated is transported into the absorption tower 1 through the oleum tail gas inlet pipe 4, and at the same time, the absorption liquid (alkaline solution) is transported into the absorption tower 1 through the absorption liquid delivery pipe 9 and the suction pump 11. The absorption liquid is transported to the atomizing nozzle 12, the conical spray hood 13 and the spray plate 15 respectively through three delivery branches 10.

[0029] The oleum tail gas floats from bottom to top, and the oleum tail gas first contacts the spray plate 15. The hand soap in the spray plate 15 falls and contacts and reacts with the oleum tail gas. Affected by the barrier effect of the spray plate 15, the rising oleum tail gas can only rise from the periphery of the spray plate 15. After rising, the conical spray hood 13 gathers the rising oleum tail gas and rises from the slot in the middle. During the gathering process, the conical spray hood 13 also sprays absorption liquid, which can further react with the rising oleum tail gas. The atomizing nozzle 12 directly sprays the slot in the middle of the conical spray hood 13, which can spray and react with the oleum tail gas again.

[0030] Example 2:

[0031] See also Figure 1-3 The present invention provides a technical solution based on Example 1: the preheating mechanism includes a hollow preheating chamber 5 with openings at both ends, the two openings are an air inlet and an air outlet respectively, the openings at both ends of the preheating chamber 5 are connected to the fuming sulfuric acid tail gas inlet pipe 4, a temperature controller 7 is provided on the upper side of the preheating chamber 5, and a resistance heating wire 6 electrically connected to the temperature controller 7 is provided inside the preheating chamber 5.

[0032] Analysis of the above content: The oleum tail gas enters and flows out through the two openings of the preheating chamber 5. Inside the preheating chamber 5, the resistance heating wire 6 is energized to convert electrical energy into thermal energy (existing technology, which will not be described here). The oleum tail gas is heated by the resistance heating wire 6, and the power of the resistance heating wire 6 is adjusted based on the temperature controller 7 (using the existing controller, such as the adjustment of different gears of the existing electric blanket, the principle is similar).

[0033] Example 3:

[0034] See also Figure 1-3 The present invention provides a technical solution based on the second embodiment: a temperature detector 8 is provided on the pipeline of the fuming sulfuric acid tail gas inlet pipe 4, and the temperature detector 8 is located on a side close to the gas outlet.

[0035] Analysis of the above content: The temperature detector 8 is used to detect the temperature of the fuming sulfuric acid tail gas after preheating. When the temperature of the fuming sulfuric acid tail gas after preheating is high, the resistance heating wire 6 can be regulated based on the temperature controller 7 to lower the temperature; otherwise, the resistance heating wire 6 can be regulated to increase the temperature.

[0036] Example 4:

[0037] See also Figure 1-3 The present invention provides a technical solution based on Example 1: the outer wall diameter of the spray plate 15 is smaller than the inner diameter of the absorption tower 1, and the outer wall of the spray plate 15 is connected to the inner wall of the absorption tower 1 through a support rod 16, the outer edge of the conical spray cover 13 is connected to the inner wall of the absorption tower 1, and a leakage groove 14 is opened at the outer edge of the conical spray cover 13.

[0038] Analysis of the above content: The outer edge of the conical spray hood 13 is connected to the inner wall of the absorption tower 1, which can gather the rising fuming sulfuric acid tail gas very well and reduce the fuming sulfuric acid tail gas from slipping out of the gap between the conical spray hood 13 and the absorption tower 1. Through the setting of the leakage groove 14, the absorption liquid on the upper surface of the conical spray hood 13 can flow downward. When the absorption liquid flows downward, some fuming sulfuric acid tail gas will rise from the leakage groove 14, and the rising fuming sulfuric acid tail gas just contacts and reacts with the downstream absorption liquid.

[0039] Embodiment 5:

[0040] See also Figure 1-3 The utility model provides a technical solution based on Example 1: it also includes a return pipe 17, the return pipe 17 is located on the outside of the absorption tower 1, and the upper end of the return pipe 17 is connected to the side wall of the exhaust pipe 3, and the lower end of the return pipe 17 is connected to the lower side of the side wall of the absorption tower 1, and a suction fan 18 is provided on the pipeline of the return pipe 17.

[0041] Analysis of the above content: The exhaust gas treated by the absorption tower 1 is circulated and absorbed by the suction fan 18, and the treated exhaust gas is mixed with the untreated exhaust gas at the inlet of the absorption tower 1. Since the circulating exhaust gas has been preliminarily treated, its pollutant concentration is relatively low, but it still contains a certain amount of incompletely absorbed pollutants. After mixing with the fresh exhaust gas through gas, the total volume of the gas increases, but the pollutant concentration is diluted. The mixed gas enters the absorption tower 1 again for absorption treatment. In the tower, the mixed gas continues to contact and react with the absorption liquid. Finally, it is discharged from the absorption tower 1 through the absorption liquid discharge pipe 2.

[0042] Example 6:

[0043] See also Figure 1-3 The present invention provides a technical solution based on the first embodiment: the lower surface of the absorption tower 1 is provided with supporting legs.

[0044] Analysis of the above content: By setting the supporting legs, the absorption tower 1 is supported, which facilitates the installation of the lower absorption liquid discharge pipe 2.

[0045] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention; therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the appended claims rather than the above description. Therefore, it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any figure marks in the claims should not be regarded as limiting the claims involved.

[0046] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An energy-saving and environmentally friendly oleum tail gas absorption device, characterized in that: include: An absorption tower (1), wherein the top end of the absorption tower (1) is connected to an exhaust pipe (3), and the bottom end of the absorption tower (1) is connected to an absorption liquid discharge pipe (2); an oleum tail gas inlet pipe (4), one end of the oleum tail gas inlet pipe (4) being connected to the lower side of the side wall of the absorption tower (1), and a preheating mechanism being provided on the pipeline of the oleum tail gas inlet pipe (4); An absorption liquid delivery pipe (9), wherein a suction pump (11) is provided on the pipeline of the absorption liquid delivery pipe (9), and one end of the absorption liquid delivery pipe (9) close to the absorption tower (1) is connected to three delivery branches (10), and an atomizing nozzle (12), a conical spray hood (13) and a spray plate (15) are respectively provided inside the absorption tower (1) from top to bottom, and the atomizing nozzle (12), the conical spray hood (13) and the spray plate (15) are respectively connected to the three delivery branches (10); The conical spray hood (13) is hollow and has a slotted top, the atomizing nozzle (12) is located just above the slotted top of the conical spray hood (13), the conical spray hood (13) and the spray plate (15) are both cavity-shaped, and the lower surfaces of the conical spray hood (13) and the spray plate (15) are evenly provided with spray holes.

2. The energy-saving and environment-friendly oleum tail gas absorption device according to claim 1, characterized in that: The preheating mechanism comprises a preheating chamber (5) which is hollow and has openings at both ends, wherein the two openings are an air inlet and an air outlet respectively. The openings at both ends of the preheating chamber (5) are connected to an oleum tail gas inlet pipe (4). A temperature controller (7) is provided on the upper side of the preheating chamber (5). A resistance heating wire (6) electrically connected to the temperature controller (7) is provided inside the preheating chamber (5).

3. The energy-saving and environment-friendly oleum tail gas absorption device according to claim 2, characterized in that: A temperature detector (8) is provided on the pipeline of the oleum tail gas inlet pipe (4), and the temperature detector (8) is located on a side close to the gas outlet.

4. The energy-saving and environment-friendly oleum tail gas absorption device according to claim 1, characterized in that: The outer wall diameter of the spray plate (15) is smaller than the inner diameter of the absorption tower (1), and the outer wall of the spray plate (15) is connected to the inner wall of the absorption tower (1) via a support rod (16). The outer edge of the conical spray hood (13) is connected to the inner wall of the absorption tower (1), and a leakage groove (14) is provided at the outer edge of the conical spray hood (13).

5. The energy-saving and environment-friendly oleum tail gas absorption device according to claim 1, characterized in that: The invention also includes a return pipe (17), the return pipe (17) being located outside the absorption tower (1), the upper end of the return pipe (17) being connected to the side wall of the exhaust pipe (3), the lower end of the return pipe (17) being connected to the lower side of the side wall of the absorption tower (1), and a suction fan (18) being provided on the pipeline of the return pipe (17).

6. The energy-saving and environment-friendly oleum tail gas absorption device according to claim 1, characterized in that: The lower surface of the absorption tower (1) is provided with supporting legs.

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