Tail gas treatment device for preparing phosphorus oxychloride

Abstract

The utility model discloses a tail gas treatment device for preparing phosphorus oxychloride, which comprises a treatment device, a filter component and an auxiliary component, the treatment device comprises a shell, and a gas delivery pipe is fixedly connected to a wall plate at the upper end of the shell in a penetrating manner; the filtering assembly comprises a filtering device body, a first filtering net and a second filtering net are installed in the filtering device body, the first filtering net is installed on the side close to an air inlet of the filtering device body, and one end of the air conveying pipe is installed on an air outlet of the filtering device body. According to the tail gas treatment device, the filtering assembly is arranged to filter solid particles such as dust in tail gas, so that the solid particles such as dust contained in the tail gas which enters the treatment device and is in contact with a sodium hydroxide solution are less, and a product obtained after the tail gas is treated by the sodium hydroxide solution can be reutilized; by arranging the flow equalizing device, the tail gas treatment effect of the sodium hydroxide solution is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of tail gas treatment, and specifically relates to a tail gas treatment device for preparing phosphorus oxychloride. Background Art

[0002] Phosphorus oxychloride is an inorganic compound and a colorless transparent liquid. Tail gas is generated during the preparation of phosphorus oxychloride. The tail gas contains substances such as hydrogen chloride and phosphorus trichloride. Since hydrogen chloride and phosphorus trichloride are highly toxic, they need to be treated. The existing tail gas during the preparation of phosphorus oxychloride is treated with a sodium hydroxide solution, so that hydrogen chloride and phosphorus oxychloride can be absorbed, making the discharged tail gas harmless to the human body.

[0003] However, since the exhaust gas contains dust and other particulate matter, when absorbing hydrogen chloride and phosphorus oxychloride, dust and other particulate matter will enter the sodium hydroxide solution, affecting the absorption effect of the sodium hydroxide solution on hydrogen chloride and phosphorus oxychloride. At the same time, dust and other particulate matter will make it difficult to reuse the products after exhaust gas treatment, resulting in a waste of resources.

[0004] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to a person skilled in the art. Utility Model Content

[0005] The utility model aims to provide a tail gas treatment device for preparing phosphorus oxychloride, which can solve the problem that dust and other particles in the tail gas affect the effect of sodium hydroxide solution on tail gas treatment and make the product difficult to reuse.

[0006] In order to achieve the above purpose, the technical solution provided by a specific embodiment of the utility model is as follows:

[0007] A tail gas treatment device for preparing phosphorus oxychloride, comprising:

[0008] The treatment device comprises a shell, an upper end wall plate of the shell is fixedly connected with a gas pipe in a penetrating manner, a sodium hydroxide solution is arranged in the shell, and the tail gas generated during the preparation of phosphorus oxychloride is introduced into the shell through the gas pipe, and harmful substances such as hydrogen chloride and phosphorus trichloride in the tail gas can be absorbed by the sodium hydroxide solution.

[0009] The filter assembly includes a filter device body, wherein a first filter screen and a second filter screen are installed in the filter device body, and the dust and other solid particles in the exhaust gas can be filtered through the first filter screen and the second filter screen, thereby reducing the dust and other solid particles from entering the housing. The first filter screen is installed on the side close to the air inlet of the filter device body, and the pore size of the filter screen on the first filter screen is larger than the pore size of the filter screen on the second filter screen, so that the exhaust gas enters the filter device body, and the solid particles with larger particle sizes are filtered through the first filter screen, and the fine solid particles are filtered through the second filter screen, so that the dust and other solid particles in the exhaust gas are thoroughly processed. One end of the gas pipe is installed on the gas outlet of the filter device body, so that the exhaust gas processed in the filter device body can be introduced into the housing through the gas pipe.

[0010] The auxiliary component includes a flow equalizing device, and a plurality of atomizing nozzles are installed at the bottom of the flow equalizing device. In order to promote the exhaust gas to fully contact with the sodium hydroxide solution in the shell and improve the treatment effect of the sodium hydroxide solution on harmful substances in the exhaust gas, the exhaust gas is homogenized by setting the flow equalizing device, and the exhaust gas is atomized and released into the shell through the atomizing nozzle, so that the exhaust gas can be well in contact with the sodium hydroxide solution. In order to further improve the effect of the exhaust gas contacting with the sodium hydroxide solution, the flow equalizing device is arranged near the bottom of the shell, and the atomizing nozzle sprays the exhaust gas in a downward manner, which increases the contact time between the exhaust gas and the sodium hydroxide solution, so as to improve the effect of exhaust gas treatment. The end of the air supply pipe away from the filter body is installed on the air inlet of the flow equalizing device, so that the air supply pipe transports the exhaust gas to the flow equalizing device.

[0011] In one or more embodiments of the utility model, an air outlet pipe is installed on the upper end wall plate of the shell, and the exhaust gas treated in the shell is discharged through the air outlet pipe. An observation window is installed on the side wall of the shell, through which the liquid level of the sodium hydroxide solution in the shell and the effect of the exhaust gas contacting with the sodium hydroxide solution in the shell can be easily checked.

[0012] In one or more embodiments of the utility model, a liquid inlet is installed at the upper end of the side wall of the shell, and the upper cover of the liquid inlet is connected to a liquid inlet cap, which facilitates the replenishment of sodium hydroxide solution into the shell through the liquid inlet, and the liquid inlet cap is used to close the liquid inlet.

[0013] In one or more embodiments of the utility model, a drain pipe is installed at the bottom of the shell, and a switch valve is installed on the drain pipe. The product obtained after sodium hydroxide absorbs hydrogen chloride and phosphorus oxychloride in the shell is discharged through the drain pipe, and the switch valve is used to control the switch of the drain pipe.

[0014] In one or more embodiments of the present invention, a pair of mounting grooves are provided in the filter device body, and the second filter screen and the mounting groove are respectively installed in the pair of mounting grooves in a sliding connection manner. The mounting grooves facilitate the disassembly and assembly of the first filter screen and the second filter screen, thereby facilitating the cleaning of impurities intercepted by the first filter screen and the second filter screen.

[0015] In one or more embodiments of the present invention, the first filter screen and the second filter screen are both provided with a mounting plate, and a handle is fixedly connected to the mounting plate, and the cooperation between the mounting plate and the handle further facilitates the assembly and disassembly of the first filter screen and the second filter screen.

[0016] In one or more embodiments of the present invention, an air intake pipe is installed on the air intake of the filter device body, and the air intake pipe is used to transport exhaust gas into the filter device body.

[0017] In one or more embodiments of the utility model, a plurality of baffles are fixedly connected to the inner wall of the shell, and the plurality of baffles are staggered with each other. The exhaust gas sprayed through the atomizing nozzle will move upward from the bottom of the shell. By setting a plurality of baffles, the residence time of the exhaust gas in the shell is extended, thereby improving the treatment effect of the sodium hydroxide solution on harmful substances in the exhaust gas.

[0018] In one or more embodiments of the present invention, a flow equalizing chamber is provided in the flow equalizing device, and the air inlets of the plurality of atomizing nozzles are connected to the flow equalizing chamber, and the flow equalizing chamber buffers the exhaust gas transported into the flow equalizing device and discharges it through the atomizing nozzle.

[0019] In one or more embodiments of the utility model, the outlet of the outlet pipe is arranged downward so that foreign matter and the like cannot enter the outlet pipe. A water filter is installed on the outlet pipe to intercept liquid and the like carried by the exhaust gas when it is discharged.

[0020] Compared with the prior art, the utility model filters solid particles such as dust in the exhaust gas by setting a filter component, so that the exhaust gas entering the treatment device and contacting with the sodium hydroxide solution contains less solid particles such as dust, so that the product after the exhaust gas is treated with the sodium hydroxide solution can be reused for a second time; by setting a flow equalizing device, the effect of the sodium hydroxide solution on the exhaust gas treatment is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 This is a front view of a tail gas treatment device for preparing phosphorus oxychloride in one embodiment of the utility model;

[0023] Figure 2 It is a three-dimensional diagram of a tail gas treatment device for preparing phosphorus oxychloride in one embodiment of the utility model;

[0024] Figure 3 This is a cross-sectional view of a tail gas treatment device for preparing phosphorus oxychloride in one embodiment of the utility model;

[0025] Figure 4 This is a cross-sectional view of a tail gas treatment device for preparing phosphorus oxychloride in one embodiment of the utility model;

[0026] Figure 5 An exploded view of a filter assembly in one embodiment of the utility model;

[0027] Figure 6 Schematic diagram of a current balancing device in one embodiment of the present invention.

[0028] Description of main reference numerals:

[0029] 1-processing device, 11-housing, 12-air delivery pipe, 13-air outlet pipe, 14-liquid inlet, 15-liquid inlet cover, 16-observation window, 17-liquid discharge pipe, 18-switch valve, 2-filter assembly, 21-filter device body, 22-first filter plate, 23-second filter plate, 24-mounting groove, 25-mounting plate, 26-handle, 27-air inlet pipe, 28-baffle, 3-auxiliary assembly, 31-flow equalizing device, 32-flow equalizing chamber, 33-atomizing nozzle, 34-water filtering device. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the technical solutions in the present invention, 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 described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0031] like Figure 1 to Figure 4 As shown, a tail gas treatment device for preparing phosphorus oxychloride in one embodiment of the utility model comprises a treatment device 1, a filter component 2 and an auxiliary component 3.

[0032] like Figure 1 to Figure 4 As shown, the treatment device 1 includes a shell 11, and a gas pipe 12 is fixedly connected to the upper end wall plate of the shell 11 in a penetrating manner. A sodium hydroxide solution is arranged in the shell 11. The tail gas generated during the preparation of phosphorus oxychloride is introduced into the shell 11 through the gas pipe 12, and harmful substances such as hydrogen chloride and phosphorus trichloride in the tail gas can be absorbed by the sodium hydroxide solution.

[0033] like Figure 1 to Figure 4 As shown, an outlet pipe 13 is installed on the upper end wall plate of the shell 11, and the exhaust gas treated in the shell 11 is discharged through the outlet pipe 13. An observation window 16 is installed on the side wall of the shell 11, through which the liquid level of the sodium hydroxide solution in the shell 11 and the effect of the exhaust gas contacting with the sodium hydroxide solution in the shell 11 can be easily checked.

[0034] like Figure 2 and Figure 3 As shown, a liquid inlet 14 is installed at the upper end of the side wall of the shell 11, and a liquid inlet cover 15 is connected to the upper cover of the liquid inlet 14. Sodium hydroxide solution is easily added to the shell 11 through the liquid inlet 14, and the liquid inlet cover 15 is used to close the liquid inlet 14.

[0035] like Figure 1 and Figure 4 As shown, a drain pipe 17 is installed at the bottom of the shell 11, and a switch valve 18 is installed on the drain pipe 17. The product obtained after the sodium hydroxide absorbs hydrogen chloride and phosphorus oxychloride in the shell 11 is discharged through the drain pipe 17, and the switch valve 18 is used to control the switch of the drain pipe 17.

[0036] like Figure 1 to Figure 5As shown, the filter assembly 2 includes a filter device body 21, and a first filter screen 22 and a second filter screen 23 are installed in the filter device body 21. The first filter screen 22 and the second filter screen 23 can filter the dust and other solid particles in the exhaust gas, thereby reducing the dust and other solid particles from entering the housing 11. The first filter screen 22 is installed on the side close to the air inlet of the filter device body 21. The aperture of the filter screen on the first filter screen 22 is larger than the aperture of the filter screen on the second filter screen 23, so that the exhaust gas enters the filter device body 21, and the solid particles with larger particle sizes are filtered by the first filter screen 22, and the fine solid particles are filtered by the second filter screen 23, so that the dust and other solid particles in the exhaust gas are thoroughly treated. One end of the gas pipe 12 is installed on the gas outlet of the filter device body 21, so that the exhaust gas treated in the filter device body 21 can be introduced into the housing 11 through the gas pipe 12.

[0037] Preferably, solid particles such as dust in the exhaust gas are processed to avoid entering the shell 11 and contacting with the sodium hydroxide solution, so that the particles such as dust will not affect the absorption effect of the sodium hydroxide solution on hydrogen chloride and phosphorus oxychloride. At the same time, the product obtained after the reaction of the sodium hydroxide solution with hydrogen chloride and phosphorus oxychloride can be reused, avoiding waste of resources.

[0038] like Figure 5 As shown, a pair of mounting grooves 24 are opened in the filter device body 21, and the second filter screen 23 and the mounting groove 24 are respectively installed in the pair of mounting grooves 24 in a sliding connection manner. The mounting grooves 24 make it easy to disassemble and assemble the first filter screen 22 and the second filter screen 23, thereby facilitating the cleaning of impurities intercepted on the first filter screen 22 and the second filter screen 23.

[0039] like Figure 5 As shown, both the first filter screen 22 and the second filter screen 23 are provided with a mounting plate 25, and a handle 26 is fixedly connected to the mounting plate 25. The cooperation between the mounting plate 25 and the handle 26 further facilitates the disassembly and assembly of the first filter screen 22 and the second filter screen 23.

[0040] like Figure 4 As shown, in one or more embodiments of the present invention, an air intake pipe 27 is installed on the air intake of the filter device body 21 , and the air intake pipe 27 is used to transport the exhaust gas into the filter device body 21 .

[0041] like Figure 3 , Figure 4 and Figure 6As shown, the auxiliary component 3 includes a flow equalizer 31, and a plurality of atomizing nozzles 33 are installed at the bottom of the flow equalizer 31. In order to promote the exhaust gas to fully contact with the sodium hydroxide solution in the housing 11 and improve the treatment effect of the sodium hydroxide solution on harmful substances in the exhaust gas, the exhaust gas is homogenized by setting the flow equalizer 31, and the exhaust gas is atomized and released into the housing 11 through the atomizing nozzle 33, so that the exhaust gas can be well in contact with the sodium hydroxide solution. The end of the gas pipe 12 away from the filter body 21 is installed on the air inlet of the flow equalizer 31, so that the gas pipe 12 transports the exhaust gas to the flow equalizer 31.

[0042] Preferably, in order to further improve the contact effect between the exhaust gas and the sodium hydroxide solution, the flow equalizing device 31 is arranged near the bottom of the shell 11, and the outlet of the atomizing nozzle 33 is arranged downward so that the exhaust gas can be sprayed downward, thereby increasing the contact time between the exhaust gas and the sodium hydroxide solution, so as to improve the effect of exhaust gas treatment.

[0043] like Figure 3 and Figure 4 As shown, a plurality of baffles 28 are fixedly connected to the inner wall of the shell 11, and the plurality of baffles 28 are staggered with each other. The exhaust gas sprayed out through the atomizing nozzle 33 will move upward from the bottom of the shell 11. By setting a plurality of baffles 28, the residence time of the exhaust gas in the shell 11 is prolonged, thereby improving the treatment effect of the sodium hydroxide solution on harmful substances in the exhaust gas.

[0044] like Figure 3 and Figure 4 As shown, a flow equalizing chamber 32 is provided in the flow equalizing device 31 , and the air inlets of multiple atomizing nozzles 33 are connected to the flow equalizing chamber 32 . The flow equalizing chamber 32 buffers the exhaust gas transported into the flow equalizing device 31 and then discharges it through the atomizing nozzles 33 .

[0045] like Figure 1 to Figure 4 As shown, the outlet of the outlet pipe 13 is arranged downward so that foreign matter and the like cannot enter the outlet pipe 13. A water filter 34 is installed on the outlet pipe 13 to intercept liquid and the like carried by the exhaust gas when it is discharged.

[0046] When in use, the exhaust gas generated during the preparation of phosphorus oxychloride is transported to the filter device body 21 through the air inlet pipe 27. When the exhaust gas flows in the filter device body 21, the first filter screen 22 and the second filter screen 23 will respectively filter the dust and other particulate matter in the exhaust gas. The filtered exhaust gas is transported to the flow equalization device 31 through the air supply pipe 12. The exhaust gas is atomized and sprayed out through multiple atomizing nozzles 33, so that the exhaust gas contacts with the sodium hydroxide solution in the shell 11, so that the harmful substances such as hydrogen chloride and phosphorus oxychloride in the exhaust gas can be absorbed by the sodium hydroxide solution, and the treated exhaust gas is discharged through the exhaust pipe 13.

[0047] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0048] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A tail gas treatment device for preparing phosphorus oxychloride, characterized in that: include: The processing device comprises a shell, and a gas delivery pipe is fixedly connected to the upper end wall plate of the shell in a penetrating manner; The filter assembly comprises a filter device body, wherein a first filter screen and a second filter screen are installed in the filter device body, wherein the first filter screen is installed on a side close to an air inlet of the filter device body, and one end of the air delivery pipe is installed on an air outlet of the filter device body; The auxiliary component comprises a flow balancing device, a plurality of atomizing nozzles are installed at the bottom of the flow balancing device, and one end of the air supply pipe away from the filtering device body is installed on the air inlet of the flow balancing device.

2. A tail gas treatment device for preparing phosphorus oxychloride according to claim 1, characterized in that: An air outlet pipe is installed on the upper end wall plate of the shell, and an observation window is installed on the side wall of the shell.

3. A tail gas treatment device for preparing phosphorus oxychloride according to claim 2, characterized in that: A liquid inlet is installed at the upper end of the side wall of the shell, and the upper cover of the liquid inlet is connected to a liquid inlet cap.

4. A tail gas treatment device for preparing phosphorus oxychloride according to claim 1, characterized in that: A liquid discharge pipe is installed at the bottom of the shell, and a switch valve is installed on the liquid discharge pipe.

5. The tail gas treatment device for preparing phosphorus oxychloride according to claim 1, characterized in that: A pair of mounting grooves are provided in the filter device body, and the second filter screen and the mounting grooves are respectively mounted in the pair of mounting grooves in a sliding connection manner.

6. A tail gas treatment device for preparing phosphorus oxychloride according to claim 5, characterized in that: The first filter screen and the second filter screen are both provided with a mounting plate, and a handle is fixedly connected to the mounting plate.

7. The tail gas treatment device for preparing phosphorus oxychloride according to claim 1, characterized in that: An air intake pipe is installed on the air intake of the filter device body, and the air intake pipe is used to transport exhaust gas into the filter device body.

8. The tail gas treatment device for preparing phosphorus oxychloride according to claim 1, characterized in that: A plurality of baffles are fixedly connected to the inner side wall of the shell, and the plurality of baffles are staggered with each other.

9. The tail gas treatment device for preparing phosphorus oxychloride according to claim 1, characterized in that: A flow balancing chamber is arranged in the flow balancing device, and the air inlets of the plurality of atomizing nozzles are connected to the flow balancing chamber.

10. The tail gas treatment device for preparing phosphorus oxychloride according to claim 2, characterized in that: The air outlet of the air outlet pipe is arranged in a downward direction, and a water filter device is installed on the air outlet pipe.

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