Phosphorus pentoxide production tail gas purification system
By combining a primary scrubbing tower, a fine scrubbing tower, and a cyclone gas-liquid separator, the problems of large area occupation and dust pollution in the treatment of phosphorus pentoxide production tail gas are solved, achieving efficient tail gas purification and resource recovery.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-12
- Publication Date
- 2026-03-24
AI Technical Summary
Existing methods for treating the exhaust gas from phosphorus pentoxide production occupy a large area, require power for pipeline transportation of washing liquid, and cause pollution by releasing phosphorus pentoxide dust and water vapor into the atmosphere.
The system employs a combination of a primary scrubbing tower and a fine scrubbing tower, along with a spray device and a cyclone gas-liquid separator, to achieve multi-stage purification of exhaust gas and collect the scrubbing liquid in a collection tank, thereby reducing the need for power transmission and dust emissions.
It reduces the equipment footprint, saves power for conveying washing liquid, enables the recycling of phosphorus pentoxide dust, and reduces dust and water vapor emissions pollution.
Smart Images
Figure CN224024590U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to chemical product production, and more particularly, to a phosphorus pentoxide production tail gas purification system. BACKGROUND
[0002] In the production process of phosphorus pentoxide, tail gas is generated. The existing treatment methods for the tail gas generated in the production of phosphorus pentoxide include a once-washing method: the tail gas is introduced into a washing tower for washing, and the gas after washing is discharged from the top and introduced into an exhaust pipe by an induced draft fan, and the washing liquid after washing is transported from the bottom to a washing liquid pool far away by a pump through a pipeline. There is also a twice-washing method: the tail gas is introduced into a first washing tower for washing, and the gas after washing is discharged from the top, and the washing liquid after washing is transported from the bottom to a washing liquid pool far away by a pump through a pipeline, and then introduced into a second washing tower from the lower part, and the gas after washing is discharged from the top and introduced into an exhaust pipe by an induced draft fan, and the washing liquid after washing is transported from the bottom to a washing liquid pool far away by a pump through a pipeline, and the washing liquids after two washings can be combined and then transported.
[0003] Such a tail gas treatment method occupies a large area, and the washing liquid pipeline transportation also needs power transmission. The phosphorus pentoxide dust and water vapor containing phosphorus pentoxide discharged into the atmosphere from the gas discharged from the washing tower cause pollution. SUMMARY
[0004] In view of the above problems, the utility model provides a phosphorus pentoxide production tail gas purification system, which aims to improve at least one problem mentioned in the background art.
[0005] A phosphorus pentoxide production tail gas purification system, comprising a washing liquid collecting tank, a primary washing tower, a fine washing tower, a production tail gas pipe, an exhaust pipe, a first washing liquid discharge pipe, a second washing liquid discharge pipe, a connecting pipe, a first liquid inlet device, and a second liquid inlet device. The production tail gas pipe is in communication with the primary washing tower, the exhaust pipe is in communication with the fine washing tower, one end of the connecting pipe is in communication with the primary washing tower, and the other end of the connecting pipe is in communication with the fine washing tower. The primary washing tower and the fine washing tower are located above the washing liquid collecting tank. The first liquid inlet device is in communication with the primary washing tower and the washing liquid collecting tank, respectively. The second liquid inlet device is in communication with the fine washing tower and the washing liquid collecting tank, respectively.
[0006] Optionally, the outlet end of the production tail gas pipe is located at the lower part of the cavity of the primary washing tower, and the outlet end of the production tail gas pipe is connected with a diffusion cap.
[0007] Optionally, the first liquid inlet device comprises a first liquid suction pipe and a first spray pipe, the liquid suction end of the first liquid suction pipe is located in the washing liquid collecting tank, the first spray pipe comprises a first upper spray pipe and a first lower spray pipe which are parallel to each other, the spray head of the first upper spray pipe is located between the upper packing layer and the lower packing layer in the primary washing tower, and the spray head of the first lower spray pipe is located between the lower packing layer in the primary washing tower and the outlet end of the production tail gas pipe; the second liquid inlet device comprises a second liquid suction pipe and a second spray pipe, the liquid suction end of the second liquid suction pipe is located in the washing liquid collecting tank, the second spray pipe comprises a second upper spray pipe and a second lower spray pipe which are parallel to each other, a demister is installed in the fine washing tower and is located above the packing layer in the fine washing tower, the spray head of the second upper spray pipe is located between the demister and the packing layer in the fine washing tower, and the spray head of the second lower spray pipe is located between the packing layer in the fine washing tower and the inlet end of the exhaust pipe.
[0008] Optionally, one end of the connecting pipe is connected to the top of the primary washing tower, and the other end of the connecting pipe is connected to the top of the fine washing tower.
[0009] Optionally, the inlet end of the exhaust pipe is located at the bottom of the cavity of the fine washing tower, the inlet end of the exhaust pipe is connected with a fog-proof cover, the phosphorus pentoxide production tail gas purification system further comprises a cyclone type gas-liquid separator, the outlet end of the exhaust pipe is communicated with the cyclone type gas-liquid separator, the cyclone type gas-liquid separator is connected with a post-gas-liquid separation exhaust pipe and a condensate pipe, and the outlet end of the condensate pipe is located in the washing liquid collecting tank.
[0010] Optionally, a plurality of partition plates are arranged in the washing liquid collecting tank, one end of each partition plate is located above the washing liquid surface, and the other end is located at the middle-lower position below the washing liquid surface.
[0011] Optionally, the washing liquid collecting tank is provided with a liquid level sensor and a water supplement pipe, and the water supplement pipe is provided with a water supplement electromagnetic valve.
[0012] Optionally, an on-line densimeter is further arranged in the washing liquid collecting tank, the washing liquid collecting tank is further connected with a phosphoric acid pipe, the inlet end of the phosphoric acid pipe is located below the on-line densimeter, and a control electromagnetic valve is arranged on the phosphoric acid pipe.
[0013] Compared with the prior art, the phosphorus pentoxide production tail gas purification system has the following beneficial effects:
[0014] The phosphorus pentoxide production tail gas purification system not only reduces the overall occupied area, but also saves the power required for conveying the first and second washing liquids to a remote place, and the first and second washing liquids can be reused, and the phosphoric acid formed by phosphorus pentoxide dust and the like can be recycled. BRIEF DESCRIPTION OF DRAWINGS
[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.
[0016] Figure 1 It is the overall structure schematic diagram of the utility model.
[0017] The figure mark explanation: 1, washing liquid collecting groove, 11, isolation board, 12, liquid level sensor, 13, water replenishing pipe, 14, booster pump, 15, online densimeter, 16, phosphoric acid pipe, 2, primary efficiency washing tower, 21, diffusion cap, 3, fine washing tower, 31, demister, 32, anti-fog cover, 4, production tail gas pipe, 5, exhaust pipe, 6, connecting pipe, 7, first liquid inlet device, 71, first liquid suction pipe, 72, first spray pipe, 8, second liquid inlet device, 81, second liquid suction pipe, 82, second spray pipe, 9, cyclone type gas-liquid separator, 91, gas-liquid separation exhaust pipe, 92, condensate pipe. DETAILED DESCRIPTION
[0018] In the description of the utility model, it needs to be explained that, unless there is explicit provision and limitation, the terms "mounting", "connection", "connection" should be understood in a broad sense, for example, it can be fixed connection, it can also be indirectly connected through intermediate medium, it can be the communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0019] In the description of the utility model, it needs to be understood that the terms "up", "down", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model. In the description of the utility model, the meaning of "a plurality of" is two or more than two, unless there is another accurate and specific provision.
[0020] The terms "first", "second", "third", "fourth" and the like in the description and in the claims of the present application, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the use of these terms herein is to be construed to cover a non-sequential process unless expressly indicated otherwise. Furthermore, the terms "comprising", "having", "including", and "containing" and any variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, system, product, or apparatus that comprises, has, includes or contains an item or list of items who does not also preclude any other items not expressly listed or inherent to such process, method, system, product, or apparatus.
[0021] For the purpose of making the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.
[0022] The technical solutions of the present application will be described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes can not be described again in some embodiments.
[0023] Reference is made to Figure 1 , Figure 1 is a schematic diagram of the overall structure of the present application.
[0024] A phosphorus pentoxide production tail gas purification system, comprising a scrubbing liquid collecting tank 1, a primary scrubbing tower 2, a fine scrubbing tower 3, a production tail gas pipe 4, an exhaust pipe 5, a first scrubbing liquid discharge pipe, a second scrubbing liquid discharge pipe, a connecting pipe 6, a first liquid inlet device 7 and a second liquid inlet device 8, the primary scrubbing tower 2 and the fine scrubbing tower 3 are located above the scrubbing liquid collecting tank 1, the production tail gas pipe 4 is in communication with the primary scrubbing tower 2, the exhaust pipe 5 is in communication with the fine scrubbing tower 3, one end of the connecting pipe 6 is in communication with the primary scrubbing tower 2 and the other end is in communication with the fine scrubbing tower 3, the first liquid inlet device 7 is in communication with the primary scrubbing tower 2 and the scrubbing liquid collecting tank 1 respectively, and the second liquid inlet device 8 is in communication with the fine scrubbing tower 3 and the scrubbing liquid collecting tank 1 respectively.
[0025] It should be appreciated by those skilled in the art that the primary scrubbing tower 2 and the fine scrubbing tower 3 can be located above the scrubbing liquid collecting tank 1 by being supported by a support installed in the scrubbing liquid collecting tank 1, which is not particularly limited here, and those skilled in the art can select as needed.
[0026] By setting the primary scrubbing tower 2 and the fine scrubbing tower 3 above the scrubbing liquid collecting tank 1, and connecting the first liquid inlet device 7 and the second liquid inlet device 8 with the scrubbing liquid collecting tank 1, in operation, the first scrubbing liquid is directly discharged into the scrubbing liquid collecting tank 1 from the first scrubbing liquid discharge pipe, the second scrubbing liquid is directly discharged into the scrubbing liquid collecting tank 1 from the second scrubbing liquid discharge pipe, and the first liquid inlet device 7 and the second liquid inlet device 8 directly transport the liquid in the scrubbing liquid collecting tank 1 to the primary scrubbing tower 2 and the fine scrubbing tower 3 for use. Not only the overall occupied area is reduced, but also the power required for transporting the first and second scrubbing liquids to a remote place is saved, and the first and second scrubbing liquids can be reused.
[0027] In one or more specific embodiments of the present application, the outlet end of the production tail gas pipe 4 is located at the lower part of the cavity of the primary scrubbing tower 2, and the outlet end of the production tail gas pipe 4 is connected with a diffusion cap 21. The diffusion cap 21 helps the tail gas to be more evenly distributed in the primary scrubbing tower 2, so that the gas can fully contact the liquid and the packing for scrubbing, promote the diffusion of gas molecules, and improve the flowability and uniformity of the gas.
[0028] In one or more specific embodiments of the present application, the first liquid inlet device 7 includes a first liquid suction pipe 71 and a first spray pipe 72, the liquid suction end of the first liquid suction pipe 71 is located in the scrubbing liquid collecting tank 1, the first spray pipe 72 includes a first upper spray pipe and a first lower spray pipe which are parallel to each other, the spray head of the first upper spray pipe is located between the upper packing layer and the lower packing layer in the primary scrubbing tower 2, and the spray head of the first lower spray pipe is located between the lower packing layer in the primary scrubbing tower 2 and the outlet end of the production tail gas pipe 4; the second liquid inlet device 8 includes a second liquid suction pipe 81 and a second spray pipe 82, the liquid suction end of the second liquid suction pipe 81 is located in the scrubbing liquid collecting tank 1, the second spray pipe 82 includes a second upper spray pipe and a second lower spray pipe which are parallel to each other, a demister 31 is installed in the fine scrubbing tower 3, the demister 31 is located above the packing layer in the fine scrubbing tower 3, the spray head of the second upper spray pipe is located between the demister 31 and the packing layer in the fine scrubbing tower 3, and the spray head of the second lower spray pipe is located between the packing layer in the fine scrubbing tower 3 and the inlet end of the exhaust pipe 5.
[0029] In one or more specific embodiments of the present application, the connecting pipe 6 is connected at one end to the top of the primary scrubbing tower 2 and at the other end to the top of the fine scrubbing tower 3.
[0030] In one or more specific embodiments of the utility model, the inlet end of the exhaust pipe 5 is located at the bottom of the cavity of the fine washing tower 3, the inlet end of the exhaust pipe 5 is connected with a fog baffle 32, the phosphorus pentoxide production tail gas purification system further comprises a cyclone type gas-liquid separator 9, the outlet end of the exhaust pipe 5 is communicated with the cyclone type gas-liquid separator 9, the cyclone type gas-liquid separator 9 is connected with a gas-liquid separation exhaust pipe 91 and a condensate pipe 92, and the outlet end of the condensate pipe 92 is located in the washing liquid collecting tank 1. Through the fog baffle 32, the exhaust pipe 5 and the cyclone type gas-liquid separator 9, the emission of the water vapor containing phosphorus pentoxide is greatly reduced, the phosphorus pentoxide dust and the water vapor containing phosphorus pentoxide are effectively prevented from being discharged into the atmosphere to cause pollution, and the gas with peculiar smell is prevented from being discharged into the atmosphere to affect the working and living environment. It is low in cost, simple in operation and low in energy consumption.
[0031] In one or more specific embodiments of the utility model, a plurality of isolation plates 11 are arranged in the washing liquid collecting tank 1, one end of each isolation plate 11 is located above the washing liquid surface, and the other end is located at the middle lower position below the washing liquid surface. The isolation plate 11 plays a role of isolation in the washing liquid collecting tank 1, and removes the force generated in the washing liquid collecting tank 1 on the other hand, so that the equipment is prevented from being damaged.
[0032] In one or more specific embodiments of the utility model, the washing liquid collecting tank 1 is provided with a liquid level sensor 12 and a water supplement pipe 13, and the water supplement pipe 13 is provided with a water supplement electromagnetic valve. When the washing liquid level is lower than the set value, the water supplement electromagnetic valve is opened to supplement water into the washing liquid collecting tank 1.
[0033] In one or more specific embodiments of the utility model, the washing liquid collecting tank 1 is provided with a booster pump 14, and the booster pump 14 is used for facilitating the spraying of the first liquid inlet device 7 and the second liquid inlet device 8.
[0034] In one or more specific embodiments of the utility model, an on-line densimeter 15 is further arranged in the washing liquid collecting tank 1, the washing liquid collecting tank 1 is further connected with a phosphoric acid pipe 16, the inlet end of the phosphoric acid pipe 16 is located below the on-line densimeter 15, and a control electromagnetic valve is arranged on the phosphoric acid pipe 16. When the on-line densimeter 15 displays that the density meets the set condition, the control electromagnetic valve is opened to transport phosphoric acid from the phosphoric acid pipe 16 to a process requiring phosphoric acid.
[0035] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the utility model, and not to limit them; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.
Claims
1. A purification system for phosphorus pentoxide production tail gas, comprising a scrubbing liquid collecting tank (1), a primary scrubbing tower (2), a fine scrubbing tower (3), a production tail gas pipe (4), an exhaust pipe (5), a first scrubbing liquid discharge pipe, a second scrubbing liquid discharge pipe, a connecting pipe (6), a first liquid inlet device (7) and a second liquid inlet device (8), the production tail gas pipe (4) being in communication with the primary scrubbing tower (2), the exhaust pipe (5) being in communication with the fine scrubbing tower (3), the connecting pipe (6) being in communication with the primary scrubbing tower (2) at one end and in communication with the fine scrubbing tower (3) at the other end, characterized in that, The primary scrubbing tower (2) and the fine scrubbing tower (3) are located above the scrubbing liquid collecting tank (1), the first liquid inlet device (7) is communicated with the primary scrubbing tower (2) and the scrubbing liquid collecting tank (1) respectively, and the second liquid inlet device (8) is communicated with the fine scrubbing tower (3) and the scrubbing liquid collecting tank (1) respectively.
2. The purified system of the phosphorus pentoxide production tail gas according to claim 1, characterized by, The outlet end of the production tail gas pipe (4) is located at the lower part of the cavity of the primary scrubbing tower (2), and the outlet end of the production tail gas pipe (4) is connected with a diffusion cap (21).
3. The purified system of tail gas of production of phosphorus pentoxide according to claim 1, characterized by, The first liquid inlet device (7) comprises a first liquid suction pipe (71) and a first spray pipe (72), the liquid suction end of the first liquid suction pipe (71) is located in the scrubbing liquid collecting tank (1), the first spray pipe (72) comprises a first upper spray pipe and a first lower spray pipe which are parallel to each other, the spray head of the first upper spray pipe is located between the upper packing layer and the lower packing layer in the primary scrubbing tower (2), and the spray head of the first lower spray pipe is located between the lower packing layer in the primary scrubbing tower (2) and the outlet end of the production tail gas pipe (4); the second liquid inlet device (8) comprises a second liquid suction pipe (81) and a second spray pipe (82), the liquid suction end of the second liquid suction pipe (81) is located in the scrubbing liquid collecting tank (1), the second spray pipe (82) comprises a second upper spray pipe and a second lower spray pipe which are parallel to each other, a defoamer (31) is installed in the fine scrubbing tower (3), the defoamer (31) is located above the packing layer in the fine scrubbing tower (3), the spray head of the second upper spray pipe is located between the defoamer (31) and the packing layer in the fine scrubbing tower (3), and the spray head of the second lower spray pipe is located between the packing layer in the fine scrubbing tower (3) and the inlet end of the exhaust pipe (5).
4. The purified system of tail gas of production of phosphorus pentoxide according to claim 1, characterized by, One end of the connecting pipe (6) is connected to the top of the primary scrubbing tower (2), and the other end is connected to the top of the fine scrubbing tower (3).
5. The purified system of tail gas of production of phosphorus pentoxide according to claim 1, characterized by, The inlet end of the exhaust pipe (5) is located at the bottom of the cavity of the fine scrubbing tower (3), the inlet end of the exhaust pipe (5) is connected with a fog-proof cover (32), the phosphorus pentoxide production tail gas purification system further comprises a cyclone type gas-liquid separator (9), the outlet end of the exhaust pipe (5) is communicated with the cyclone type gas-liquid separator (9), the cyclone type gas-liquid separator (9) is connected with a gas-liquid separated exhaust pipe (91) and a condensate pipe (92), and the outlet end of the condensate pipe (92) is located in the scrubbing liquid collecting tank (1).
6. The purified system of tail gas of production of phosphorus pentoxide according to claim 1, characterized by, A plurality of isolation plates (11) are arranged in the scrubbing liquid collecting tank (1), one end of each isolation plate (11) is located above the scrubbing liquid surface, and the other end is located at the middle and lower part below the scrubbing liquid surface.
7. The purified phosphorus pentoxide production tail gas system of claim 1, wherein, The scrubbing liquid collecting tank (1) is provided with a liquid level sensor (12) and a water supplement pipe (13), and the water supplement pipe (13) is provided with a water supplement electromagnetic valve.
8. The purified phosphorus pentoxide production tail gas system of claim 1, wherein, The scrubbing liquid collecting tank (1) is further provided with an on-line densimeter (15), and the scrubbing liquid collecting tank (1) is further connected with a phosphoric acid pipe (16), the inlet end of the phosphoric acid pipe (16) is located below the on-line densimeter (15), and the phosphoric acid pipe (16) is provided with a control electromagnetic valve.