A phthalic anhydride tail gas treatment device and method

Abstract

The present invention relates to the field of gas treatment technology, and in particular to a phthalic anhydride tail gas treatment device and method, wherein the technical solution includes a shell, a bottom shell and a spiral cover, wherein a mounting groove is provided in the shell, a second temperature sensor is fixedly installed on the inner wall of the mounting groove, and a third heat-conducting cover and a second heat-conducting cover are fixedly installed inside the mounting groove. The present invention installs a spiral cover inside the shell, and guides the phthalic anhydride tail gas inside the shell through the spiral cover, so that the phthalic anhydride tail gas rises in a spiral path, and is fully in contact with the catalyst on the surface of the spiral cover, thereby promoting the catalytic incineration of the phthalic anhydride tail gas under the catalyst and high temperature environment, and utilizing the rotation of the spiral cover to regulate the flow velocity of the phthalic anhydride tail gas in the vertical direction, thereby enabling the device to adjust the reaction velocity and reaction time of the phthalic anhydride tail gas according to actual use requirements, so as to maximize the treatment effect of the device on the phthalic anhydride tail gas.

Description

Technical Field

[0001] The invention relates to the technical field of gas treatment, and in particular to a phthalic anhydride tail gas treatment device and method. Background Art

[0002] Phthalic anhydride, also known as phthalic anhydride, is an important organic chemical raw material, widely used in synthetic resins, dyes, medicines and other fields. During the production process, the synthesis of phthalic anhydride is often accompanied by the emission of harmful gases, such as volatile organic compounds and acidic gases, which pose a threat to the environment and human health. Therefore, we propose a phthalic anhydride tail gas treatment device.

[0003] When the phthalic anhydride tail gas treatment device in the prior art uses the catalytic incineration method to catalyze the tail gas, the phthalic anhydride tail gas needs to penetrate the interior of the catalyst so that the impurities in the tail gas contact the catalyst, which can easily cause blockage inside the catalyst, affecting the catalytic effect of the catalyst in the later stage and increasing the difficulty of later maintenance of the device.

[0004] In view of this, we propose a phthalic anhydride tail gas treatment device and method to solve the existing problems. Summary of the invention

[0005] The object of the present invention is to provide a phthalic anhydride tail gas treatment device and method to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a phthalic anhydride tail gas treatment device, comprising a shell, a bottom shell and a spiral cover, wherein a mounting groove is provided in the shell, a second temperature sensor is fixedly installed on the inner wall of the mounting groove, a third heat-conducting cover and a second heat-conducting cover are fixedly installed inside the mounting groove, the third heat-conducting cover and the second heat-conducting cover are both cylindrical structures formed by welding multiple groups of copper tubes, and the insides of the third heat-conducting cover and the second heat-conducting cover are both filled with heat-conducting oil, and a fourth temperature sensor is fixedly installed on the inner wall of the shell;

[0007] A top cover is fixedly installed on the top of the shell, a first heat-conducting cover is fixedly installed inside the top cover, the first heat-conducting cover is fixedly connected to the third heat-conducting cover, and three sets of heat exchange disks are fixedly installed inside the shell;

[0008] A driving motor is fixedly installed on the top of the top cover, a reduction box is fixedly installed on the bottom of the driving motor, and a driving shaft is fixedly installed on the bottom of the reduction box;

[0009] A spiral cover is fixedly installed at the bottom of the driving shaft, a rotating shaft is fixedly installed at the central position of the spiral cover, and the top of the rotating shaft is fixedly connected to the driving shaft, a plurality of guide grooves are fixedly installed on the top and bottom surfaces of the spiral cover, and a plurality of catalysts are fixedly installed inside the guide grooves;

[0010] A bottom shell is fixedly installed at the bottom of the shell, a fourth heat-conducting cover is fixedly installed in the bottom shell, and the fourth heat-conducting cover is fixedly connected to the second heat-conducting cover, a heat-conducting plate is fixedly installed on the inner side of the fourth heat-conducting cover, and the heat-conducting plate extends to the inner wall of the bottom shell, a third temperature sensor is fixedly installed on the inner wall of the bottom shell, an air intake pipe is fixedly installed on one side of the bottom shell, and an air extraction pump is fixedly installed at one end of the air intake pipe.

[0011] Preferably, a guide plate is fixedly installed inside the top cover, a bearing is fixedly installed at the central position of the guide plate, and a plurality of exhaust holes which are narrow at the top and wide at the bottom are opened inside the guide plate.

[0012] Preferably, a first temperature sensor is fixedly mounted on the inner wall of the top cover, and an annular heat spreader is fixedly mounted on the inner wall of the top cover.

[0013] Preferably, an exhaust pipe is fixedly installed on one side of the top of the top cover, and a one-way pipe is fixedly installed at the connection position between the exhaust pipe and the top cover.

[0014] Preferably, a controller is fixedly mounted on one side of the shell, and the controller is electrically connected to the second heat-conductive cover and the third heat-conductive cover, and the controller is electrically connected to the first temperature sensor, the second temperature sensor and the fourth temperature sensor respectively.

[0015] Preferably, a mounting plate is fixedly installed inside the shell, and a plurality of feeding holes are opened inside the mounting plate near the edge, and a through hole is opened at the central position of the mounting plate.

[0016] Preferably, a deflector cover is fixedly mounted on the top of the mounting plate, the deflector cover is a conical hollow structure, and the deflector cover is snap-connected to the rotating shaft.

[0017] Preferably, a mounting plate is fixedly installed inside the shell, the mounting plate is snap-connected with the rotating shaft, and a plurality of circular holes are opened inside the mounting plate.

[0018] Preferably, a fixing plate is fixedly installed on the bottom of the bottom shell through four support frames, and the fixing plate is fixedly connected to the bottom of the vacuum pump. A sewage pipe is fixedly installed on the bottom of the bottom shell, and an electric butterfly valve is fixedly installed at the connection position between the sewage pipe and the bottom shell.

[0019] Preferably, a phthalic anhydride tail gas treatment method provided by a phthalic anhydride tail gas treatment device comprises the following steps:

[0020] In the first step, the vacuum pump extracts phthalic anhydride tail gas, allowing the phthalic anhydride tail gas to enter the bottom shell through the air intake pipe, and the heat conducting plate inside the fourth heat conducting cover absorbs heat from the phthalic anhydride tail gas entering the bottom shell, and transfers the heat to the second heat conducting cover, using the waste heat of the phthalic anhydride tail gas to heat the interior of the shell;

[0021] In the second step, the phthalic anhydride tail gas inside the bottom shell enters the shell after being guided by the mounting plate and the guide cover, and flows from bottom to top under the guidance of the spiral cover, while contacting with the catalyst on the surface of the spiral cover to reduce the ignition point of impurities inside the phthalic anhydride tail gas;

[0022] In the third step, the driving motor rotates after being powered on to drive the spiral cover to rotate, and the spiral cover promotes the upward flow of the phthalic anhydride tail gas by forward rotation, or hinders the upward flow of the phthalic anhydride tail gas by reverse rotation, thereby adjusting the reaction time of the phthalic anhydride tail gas inside the shell according to actual use conditions;

[0023] In the fourth step, the fourth temperature sensor on the inner wall of the shell monitors the reaction environment temperature inside the shell, and cooperates with the controller to energize the second heat conductive cover and the third heat conductive cover for electrical heating, so that the environment temperature inside the shell is within the range of 300 to 500 degrees Celsius;

[0024] In the fifth step, the phthalic anhydride tail gas inside the shell is catalytically incinerated under the action of a catalyst at an environment of 300 to 500 degrees Celsius, so that impurities in the phthalic anhydride tail gas are burned and removed, and the treated tail gas slowly rises into the interior of the top cover;

[0025] In the sixth step, the heat exchange plate absorbs the waste heat of the phthalic anhydride tail gas entering the top cover and transfers the heat to the first heat conductive cover, and the waste heat is transferred to the third heat conductive cover through the first heat conductive cover for waste heat recovery and utilization. After the phthalic anhydride tail gas is guided by the guide plate, it is discharged from the device through the exhaust pipe.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. The present invention installs a spiral cover inside the shell to guide the phthalic anhydride tail gas inside the shell, so that the phthalic anhydride tail gas rises in a spiral path and fully contacts with the catalyst on the surface of the spiral cover, thereby promoting the catalytic incineration of the phthalic anhydride tail gas under the catalyst and high temperature environment, and utilizing the rotation of the spiral cover to regulate the flow velocity of the phthalic anhydride tail gas in the vertical direction, thereby enabling the device to adjust the reaction speed and reaction time of the phthalic anhydride tail gas according to actual use requirements, so as to maximize the treatment effect of the device on the phthalic anhydride tail gas.

[0028] 2. The present invention installs a second heat-conducting cover and a third heat-conducting cover inside the shell, connects the second heat-conducting cover to the first heat-conducting cover inside the top cover, and connects the third heat-conducting cover to the fourth heat-conducting cover inside the bottom shell, thereby recovering the heat in the phthalic anhydride tail gas in the process of the phthalic anhydride tail gas entering the device and discharging the device, thereby heating the tail gas for subsequent treatment, which has an energy-saving effect on the device, and when the ambient temperature inside the shell is too high, the second heat-conducting cover and the third heat-conducting cover can be used to absorb the heat inside the shell, transfer the heat to the first heat-conducting cover and the heat exchange plate, and then discharge the heat from the device through the tail gas, which has the effect of cooling the inside of the shell, and cooperates with the controller to electrically heat the second heat-conducting cover and the third heat-conducting cover, so as to accurately control the temperature of the environment inside the shell to prevent the catalyst from being deactivated due to excessive temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of a first three-dimensional structure of the present invention;

[0030] Figure 2 It is a schematic diagram of a three-dimensional cross-sectional structure of the present invention;

[0031] Figure 3 It is a schematic diagram of the three-dimensional internal structure of the present invention;

[0032] Figure 4 It is a schematic diagram of the front external structure of the present invention;

[0033] Figure 5 It is a schematic diagram of the front cross-sectional structure of the present invention;

[0034] Figure 6 It is a schematic diagram of a first partial cross-sectional structure of the present invention;

[0035] Figure 7 It is a schematic diagram of a second partial cross-sectional structure of the present invention;

[0036] Figure 8 It is a schematic diagram of a first partial three-dimensional cross-sectional structure of the present invention;

[0037] Fig. 9 It is a schematic diagram of a second partial three-dimensional cross-sectional structure of the present invention;

[0038] Fig.10 It is a schematic diagram of the second three-dimensional structure of the present invention.

[0039] In the figure: 1, top cover; 101, guide plate; 102, heat exchange plate; 103, first heat conductive cover; 104, first temperature sensor; 105, exhaust pipe; 2, shell; 201, mounting groove; 202, controller; 203, second heat conductive cover; 204, mounting plate; 205, guide cover; 206, second temperature sensor; 207, third heat conductive cover; 208, mounting plate; 3, bottom shell; 301, air inlet pipe; 302, air pump; 303, fixing plate; 304, drain pipe; 305, third temperature sensor; 306, heat conductive plate; 307, fourth heat conductive cover; 4, spiral cover; 401, guide groove; 402, rotating shaft; 5, driving motor; 501, driving shaft. DETAILED DESCRIPTION

[0040] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0041] like Figure 1 - Fig.10As shown, a phthalic anhydride tail gas treatment device proposed by the present invention comprises a shell 2, a bottom shell 3 and a spiral cover 4, a mounting groove 201 is provided in the shell 2, a second temperature sensor 206 is fixedly installed on the inner wall of the mounting groove 201, a third heat-conducting cover 207 and a second heat-conducting cover 203 are fixedly installed inside the mounting groove 201, the third heat-conducting cover 207 and the second heat-conducting cover 203 are both cylindrical structures formed by welding multiple groups of copper tubes, and the interiors of the third heat-conducting cover 207 and the second heat-conducting cover 203 are filled with heat-conducting oil, and the inner wall of the shell 2 is fixed with a second temperature sensor 206. The fourth temperature sensor is fixedly installed, the housing 2 can provide a mounting position for the internal components, the mounting groove 201 is used to provide a mounting position for the internal components, the second temperature sensor 206 adopts the GWP200 type, and the second temperature sensor 206 can detect the temperature inside the mounting groove 201, so that according to the temperature inside the mounting groove 201, the controller 202 energizes the second heat-conducting cover 203 and the third heat-conducting cover 207, thereby increasing the ambient temperature inside the housing 2, so that the phthalic anhydride tail gas is heated after contacting the catalyst. , can perform catalytic incineration in a high temperature environment, and then realize tail gas treatment of phthalic anhydride tail gas, the second heat conductive cover 203 can absorb the heat inside the fourth heat conductive cover 307, and the third heat conductive cover 207 can absorb the heat inside the first heat conductive cover 103, so that during the flow of phthalic anhydride tail gas, the waste heat inside the phthalic anhydride tail gas can be recycled, and the second heat conductive cover 203 and the third heat conductive cover 207 are then powered on by the controller 202 to heat, and the temperature inside the shell 2 is compensated, so that the temperature inside the shell 2 is maintained at 300 to The temperature of the catalyst is within the range of 500 degrees Celsius, so that the catalyst can process the phthalic anhydride tail gas under a high temperature environment and avoid the catalyst from being deactivated due to excessive temperature. The fourth temperature sensor adopts the GWP200 type, which can detect the temperature inside the shell 2, and then feed back the detection data to the controller 202, so that the controller 202 controls the second heat conductive cover 203 and the third heat conductive cover 207 to perform temperature compensation on the inside of the shell 2 according to the data detected by the fourth temperature sensor, thereby controlling the ambient temperature inside the shell 2 within the range of 300 to 500 degrees Celsius;

[0042] The top cover 1 is fixedly installed on the top of the shell 2, and the first heat-conducting cover 103 is fixedly installed in the top cover 1. The first heat-conducting cover 103 is fixedly connected to the third heat-conducting cover 207. Three sets of heat exchange disks 102 are fixedly installed inside the shell 2. The top cover 1 can provide installation positions for the internal components. The first heat-conducting cover 103 can cooperate with the heat exchange disk 102 to absorb the heat inside the phthalic anhydride tail gas, and transfer the recovered heat to the third heat-conducting cover 207, so that the third heat-conducting cover 207 heats the inside of the shell 2. On the one hand, it can maximize the use of heat energy to achieve the purpose of reducing the overall energy consumption of the device, and on the other hand, it can avoid the heat after treatment. The phthalic anhydride tail gas carries a large amount of heat when it is discharged from the device, so as to prevent it from affecting the atmospheric environment. The heat exchange disk 102 is a mesh disk structure. The edge of the heat exchange disk 102 is fixedly connected to the inner wall of the top cover 1. A circular hole is provided at the central position of the heat exchange disk 102 to provide a mounting position for the drive shaft 501, and a distance of 3 to 5 cm is kept between the circular hole and the drive shaft 501. The heat exchange disk 102 can absorb the waste heat in the phthalic anhydride tail gas during the upward flow of the phthalic anhydride tail gas from the inside, thereby transferring the absorbed heat energy to the first heat conductive cover 103, and then transferring the recovered heat energy to the inside of the shell 2 through the first heat conductive cover 103;

[0043] A driving motor 5 is fixedly installed on the top of the top cover 1, a reduction box is fixedly installed on the bottom of the driving motor 5, and a driving shaft 501 is fixedly installed on the bottom of the reduction box. The driving motor 5 adopts the YE3-100KW type. The driving motor 5 can rotate after being energized, and then drive the driving shaft 501 to rotate through the reduction box. The driving shaft 501 can be fixedly connected with the spiral cover 4, so that the driving shaft 501 drives the spiral cover 4 to rotate synchronously when rotating;

[0044] A spiral cover 4 is fixedly installed at the bottom of the driving shaft 501, a rotating shaft 402 is fixedly installed at the central position of the spiral cover 4, and the top of the rotating shaft 402 is fixedly connected to the driving shaft 501, and a plurality of guide grooves 401 are fixedly installed on the top and bottom surfaces of the spiral cover 4, and a plurality of catalysts are fixedly installed inside the guide grooves 401. The spiral cover 4 can guide the phthalic anhydride tail gas entering the shell 2, so that the phthalic anhydride tail gas flows upward in a spiral shape. The rotating shaft 402 is fixedly connected to the driving shaft 501, so that the spiral cover 4 can be rotated, and then according to the treatment requirements of the phthalic anhydride tail gas, the phthalic anhydride tail gas is promoted to accelerate or decelerate the flow, thereby extending or shortening the treatment time of the phthalic anhydride tail gas, and the phthalic anhydride tail gas is guided through the guide grooves 401 with built-in catalysts, so that the phthalic anhydride tail gas is catalytically incinerated under the catalyst and high temperature environment, and impurities in the phthalic anhydride tail gas are removed;

[0045] The bottom of the shell 2 is fixedly installed with a bottom shell 3, a fourth heat-conducting cover 307 is fixedly installed in the bottom shell 3, and the fourth heat-conducting cover 307 is fixedly connected to the second heat-conducting cover 203, a heat-conducting plate 306 is fixedly installed on the inner side of the fourth heat-conducting cover 307, and the heat-conducting plate 306 extends to the inner wall of the bottom shell 3, a third temperature sensor 305 is fixedly installed on the inner wall of the bottom shell 3, an air intake pipe 301 is fixedly installed on one side of the bottom shell 3, and an air pump 302 is fixedly installed at one end of the air intake pipe 301, the bottom shell 3 can provide a mounting position for the surrounding components, the fourth heat-conducting cover 307 can absorb the heat inside the bottom shell 3, and then transfer the heat to the second heat-conducting cover 203, so as to recover the waste heat in the tail gas of phthalic anhydride, and the heat-conducting plate 306 can The heat conduction area is enlarged, and the absorption speed of the residual heat inside the phthalic anhydride tail gas is increased, so that the residual heat in the phthalic anhydride tail gas can be absorbed more quickly into the fourth heat conductive cover 307. The third temperature sensor 305 adopts the GWP200 type. The third temperature sensor 305 can detect the temperature inside the bottom shell 3, and then cooperate with the controller 202 to adjust the temperature inside the shell 2. The air inlet pipe 301 can guide the phthalic anhydride tail gas into the interior of the device, so that the phthalic anhydride tail gas flows from bottom to top inside the device, and the phthalic anhydride tail gas flows while being catalytically incinerated. The vacuum pump 302 adopts the RB-53D-1 type. The vacuum pump 302 can pump the phthalic anhydride tail gas into the bottom shell 3, and then pump the phthalic anhydride tail gas into the interior of the device for catalytic incineration.

[0046] Furthermore, a guide plate 101 is fixedly installed inside the top cover 1, a bearing is fixedly installed at the central position of the guide plate 101, and a plurality of exhaust holes which are narrow at the top and wide at the bottom are opened inside the guide plate 101. The guide plate 101 can guide the phthalic anhydride tail gas in the top cover 1, so that after the phthalic anhydride tail gas absorbs heat through the heat exchange plate 102, the phthalic anhydride tail gas is evenly distributed in the top cover 1 through the guide plate 101, and then the treated phthalic anhydride tail gas is discharged from the exhaust device through the exhaust pipe 105.

[0047] Furthermore, a first temperature sensor 104 is fixedly installed on the inner wall of the top cover 1, and an annular heat spreader is fixedly installed on the inner wall of the top cover 1. The first temperature sensor 104 adopts the GWP200 type. The first temperature sensor 104 can detect the temperature inside the top cover 1, and then receive the detection data of the first temperature sensor 104 through the controller 202, and compare it with the value detected by the fourth temperature sensor to judge the heat exchange effect of the components inside the top cover 1 on the phthalic anhydride exhaust gas, and at the same time control the second heat conductive cover 203 and the third heat conductive cover 207 to be powered on and heated, so as to regulate the temperature inside the shell 2.

[0048] Furthermore, an exhaust pipe 105 is fixedly installed on one side of the top of the top cover 1, and a one-way pipe is fixedly installed at the connection position between the exhaust pipe 105 and the top cover 1. The exhaust pipe 105 can guide the treated phthalic anhydride tail gas to be discharged from the top cover 1, and the one-way pipe can make the phthalic anhydride tail gas flow in one direction in the exhaust pipe 105, thereby preventing the air outside the device from entering the interior of the device through the exhaust pipe 105 and affecting the catalytic incineration treatment of the phthalic anhydride tail gas by the device.

[0049] Furthermore, a controller 202 is fixedly installed on one side of the shell 2, and the controller 202 is electrically connected to the second heat conductive cover 203 and the third heat conductive cover 207. The controller 202 is electrically connected to the first temperature sensor 104, the second temperature sensor 206 and the fourth temperature sensor respectively. The controller 202 adopts the FX3SA-30MR-CM type. The controller 202 can detect the temperature inside the bottom shell 3, the shell 2, the top cover 1 and the installation groove 201 through the first temperature sensor 104, the second temperature sensor 206, the third temperature sensor 305 and the fourth temperature sensor, and And according to the detected temperature data, the current is controlled, and then the second heat-conducting cover 203 and the third heat-conducting cover 207 are powered on for temperature compensation, so that the temperature inside the shell 2 is maintained in the range of 300 to 500 degrees Celsius, so that the catalyst can effectively catalytically incinerate the phthalic anhydride tail gas. The detection data can also be used to determine the recovery effect of the first heat-conducting cover 103 and the fourth heat-conducting cover 307 on the residual heat inside the phthalic anhydride tail gas, thereby controlling the rotation direction and speed of the drive motor 5, and then controlling the flow speed of the phthalic anhydride tail gas in the shell 2, thereby improving the treatment effect and heat exchange effect of the device on the phthalic anhydride tail gas.

[0050] Furthermore, a mounting plate 204 is fixedly installed inside the shell 2, and a plurality of discharge holes are opened inside the mounting plate 204 near the edge position, and a through hole is opened at the central position of the mounting plate 204. The mounting plate 204 can provide a mounting position for the top components, and the plurality of discharge holes inside the mounting plate 204 can guide the solid impurities falling during the treatment of phthalic anhydride tail gas, so that the solid impurities on the top of the mounting plate 204 fall into the inside of the bottom shell 3, so as to facilitate the concentrated discharge of the solid impurities from the device through the sewage pipe 304 at a later time.

[0051] Furthermore, a guide hood 205 is fixedly installed on the top of the mounting plate 204. The guide hood 205 is a conical hollow structure, and the guide hood 205 is engaged with the rotating shaft 402. The guide hood 205 can guide the phthalic anhydride exhaust gas inside the bottom shell 3 to enter the shell 2, and make the phthalic anhydride exhaust gas flow upward from just below the spiral cover 4, so that the phthalic anhydride exhaust gas can flow upward in a spiral shape under the guidance of the spiral cover 4, and then contact the catalyst inside the guide groove 401, and undergo catalytic incineration treatment inside the shell 2.

[0052] Furthermore, a mounting plate 208 is fixedly installed inside the shell 2, and the mounting plate 208 is snap-connected with the rotating shaft 402, and a plurality of circular holes are opened inside the mounting plate 208. The mounting plate 208 can guide the phthalic anhydride exhaust gas above the spiral cover 4, so that the phthalic anhydride exhaust gas after catalytic incineration can enter the interior of the top cover 1 evenly after being guided by the mounting plate 208, and the mounting plate 208 can limit the rotating shaft 402 in the horizontal direction to ensure the stability of the rotating shaft 402 and the spiral cover 4 during rotation.

[0053] Furthermore, a fixing plate 303 is fixedly installed at the bottom of the bottom shell 3 through four supporting frames, and the fixing plate 303 is fixedly connected to the bottom of the vacuum pump 302, a sewage pipe 304 is fixedly installed at the bottom of the bottom shell 3, and an electric butterfly valve is fixedly installed at the connection position between the sewage pipe 304 and the bottom shell 3, the fixing plate 303 can expand the supporting area of ​​the bottom of the device, so as to cooperate with the four supporting frames to support the bottom shell 3, thereby ensuring the stability of the device, and the sewage pipe 304 can be controlled to switch by the electric butterfly valve, so as to facilitate the centralized discharge of solid impurities collected inside the bottom shell 3.

[0054] Furthermore, a phthalic anhydride tail gas treatment method provided by a phthalic anhydride tail gas treatment device comprises the following steps:

[0055] In the first step, the vacuum pump 302 extracts phthalic anhydride tail gas, so that the phthalic anhydride tail gas enters the bottom shell 3 through the air inlet pipe 301, and the heat conductive plate 306 inside the fourth heat conductive cover 307 absorbs heat from the phthalic anhydride tail gas entering the bottom shell 3, and transfers the heat to the second heat conductive cover 203, and uses the waste heat of the phthalic anhydride tail gas to heat the inside of the shell 2. The phthalic anhydride tail gas is pumped into the bottom shell 3 through the vacuum pump 302. After the phthalic anhydride tail gas absorbs heat through the heat conductive plate 306 inside the bottom shell 3, the heat is transferred to the fourth heat conductive cover 307 through the heat conductive plate 306. The fourth heat conductive cover 307 transfers the absorbed heat to the second heat conductive cover 203, so that the second heat conductive cover 203 heats the inside of the shell 2;

[0056] In the second step, the phthalic anhydride tail gas inside the bottom shell 3 is guided by the mounting plate 204 and the guide cover 205 to enter the shell 2, and flows from bottom to top under the guidance of the spiral cover 4, and contacts with the catalyst on the surface of the spiral cover 4 to reduce the ignition point of impurities inside the phthalic anhydride tail gas. After heat exchange with the fourth heat-conducting cover 307, the phthalic anhydride tail gas enters the shell 2, and rises in a spiral shape under the guidance of the spiral cover 4. At the same time, the phthalic anhydride tail gas and the guide groove 401 The first temperature sensor 104, the second temperature sensor 206 and the fourth temperature sensor are connected through the controller 202 to detect the ambient temperature inside the shell 2, and the second heat-conducting cover 203 and the third heat-conducting cover 207 are energized to generate heat for heating the shell 2, and the ambient temperature inside the shell 2 is controlled within the range of 300 to 500 degrees Celsius, so that the phthalic anhydride tail gas is catalytically incinerated under the influence of high temperature and catalyst inside the shell 2, so that the impurities inside the phthalic anhydride tail gas are removed;

[0057] In the third step, the driving motor 5 is powered on to rotate and drive the spiral cover 4 to rotate. The spiral cover 4 promotes the upward flow of the phthalic anhydride tail gas by forward rotation, or the spiral cover 4 hinders the upward flow of the phthalic anhydride tail gas by reverse rotation, and then adjusts the reaction time of the phthalic anhydride tail gas inside the shell 2 according to the actual use situation. According to the treatment effect of the phthalic anhydride tail gas, the driving motor 5 drives the spiral cover 4 to rotate, and adjusts the speed and rotation direction of the spiral cover 4, thereby controlling the phthalic anhydride tail gas to accelerate or decelerate the flow inside the shell 2, and improving the treatment effect of the device on the phthalic anhydride tail gas;

[0058] In the fourth step, the fourth temperature sensor on the inner wall of the shell 2 monitors the reaction environment temperature inside the shell 2, and cooperates with the controller 202 to energize the second heat-conducting cover 203 and the third heat-conducting cover 207 for electrical heating, so that the ambient temperature inside the shell 2 is within the range of 300 to 500 degrees Celsius. The fourth temperature sensor continuously detects the temperature inside the shell 2. When the ambient temperature inside the shell 2 is lower than 300 degrees Celsius, an electrical signal is fed back to the controller 202, so that the controller 202 energizes the second heat-conducting cover 203 and the third heat-conducting cover 207, so that the second heat-conducting cover 203 and the third heat-conducting cover 207 are heated. The third heat-conducting cover 207 electrically heats the shell 2, and cooperates with the heat absorbed by the first heat-conducting cover 103 and the fourth heat-conducting cover 307 to regulate the internal ambient temperature of the shell 2. When the ambient temperature inside the shell 2 is higher than 500 degrees Celsius, the controller 202 stops energizing the second heat-conducting cover 203 and the third heat-conducting cover 207, so that the phthalic anhydride tail gas, after being treated, discharges the excess heat inside the shell 2 out of the device, thereby reducing the internal temperature of the shell 2, and controlling the ambient temperature inside the shell 2 within the range of 300 to 500 degrees Celsius, thereby promoting the catalytic incineration treatment of the phthalic anhydride tail gas;

[0059] In the fifth step, the phthalic anhydride tail gas inside the shell 2 is catalytically incinerated under the action of the catalyst in an environment of 300 to 500 degrees Celsius, so that impurities in the phthalic anhydride tail gas are incinerated and removed, and the treated tail gas slowly rises into the interior of the top cover 1. The phthalic anhydride tail gas contacts the catalyst under the guidance of the spiral cover 4 and slowly rises in a spiral shape. The high temperature environment inside the shell 2 promotes the catalytic incineration of impurities inside the phthalic anhydride tail gas, thereby removing impurities in the phthalic anhydride tail gas;

[0060] In the sixth step, the heat exchange disk 102 absorbs the waste heat of the phthalic anhydride tail gas entering the top cover 1, and transfers the heat to the first heat conductive cover 103. The waste heat is transferred to the third heat conductive cover 207 through the first heat conductive cover 103 for waste heat recovery. The phthalic anhydride tail gas is guided by the guide plate 101 and discharged from the device through the exhaust pipe 105. After the phthalic anhydride tail gas is catalytically incinerated by the components inside the shell 2, the phthalic anhydride tail gas with heat enters the top cover 1, and the heat inside the phthalic anhydride tail gas is absorbed by the heat exchange disk 102, and then the absorbed heat is transferred to the first heat conductive cover 103. The first heat conductive cover 103 transfers the absorbed heat to the third heat conductive cover 207, thereby heating the shell 2. The phthalic anhydride tail gas that is heat-exchanged is guided by the guide plate 101 and uniformly discharged from the top cover 1 through the exhaust pipe 105, thereby completing the catalytic incineration treatment of the phthalic anhydride tail gas.

[0061] Working principle: the first temperature sensor 104, the second temperature sensor 206, the third temperature sensor 305 and the fourth temperature sensor respectively detect the temperature inside the top cover 1, the mounting groove 201, the bottom shell 3 and the shell 2, and transmit electrical signals to the controller 202 for temperature monitoring. After the vacuum pump 302 is powered on, the phthalic anhydride tail gas is pumped into the bottom shell 3. After the phthalic anhydride tail gas enters the bottom shell 3, the fourth heat-conducting cover 307 absorbs the heat of the phthalic anhydride tail gas inside the bottom shell 3, and transfers the heat to the second heat-conducting cover 203 to preheat the shell 2. The phthalic anhydride tail gas after the first heat exchange is guided into the interior of the shell 2 through the mounting plate 204 and the guide cover 205, and the phthalic anhydride tail gas is guided to flow spirally upward inside the shell 2 through the spiral cover 4. The controller 202 controls the drive motor 5 to be powered on and rotated, and the drive motor 5 drives the drive shaft 501 to rotate through the reduction gear box, and the drive shaft 501 drives the spiral cover 4 is rotated, and the speed and rotation direction of the spiral cover 4 are adjusted according to the actual use requirements of the device, so that the phthalic anhydride tail gas is accelerated or decelerated under the guidance of the spiral cover 4, thereby shortening or prolonging the processing time of the phthalic anhydride tail gas in the shell 2. After the phthalic anhydride tail gas contacts the catalyst on the surface of the spiral cover 4, it is catalytically incinerated under a high temperature environment, so that the impurities in the phthalic anhydride tail gas are incinerated into solid impurities and sink into the bottom shell 3. The treated phthalic anhydride tail gas enters the top cover 1 through the mounting plate 208. After the phthalic anhydride tail gas is guided by the heat exchange disk 102, the heat exchange disk 102 absorbs the heat of the phthalic anhydride tail gas, and then transfers the absorbed heat to the first heat conductive cover 103. The first heat conductive cover 103 transfers the absorbed heat to the third heat conductive cover 207 to heat the shell 2. After the phthalic anhydride tail gas passes through the heat exchange disk 102, it is guided by the guide plate 101 and uniformly discharged from the top cover 1 from the exhaust pipe 105.

[0062] The above-mentioned specific embodiments are only several preferred embodiments of the present invention. Based on the technical solutions of the present invention and the relevant inspirations of the above-mentioned embodiments, those skilled in the art can make various alternative improvements and combinations to the above-mentioned specific embodiments.

Claims

1. A phthalic anhydride tail gas treatment device, comprising a housing (2), a bottom housing (3) and a spiral cover (4), characterized in that: The shell (2) is provided with a mounting groove (201), a second temperature sensor (206) is fixedly mounted on the inner wall of the mounting groove (201), a third heat-conducting cover (207) and a second heat-conducting cover (203) are fixedly mounted inside the mounting groove (201), the third heat-conducting cover (207) and the second heat-conducting cover (203) are both cylindrical structures formed by welding a plurality of groups of copper tubes, and the insides of the third heat-conducting cover (207) and the second heat-conducting cover (203) are both filled with heat-conducting oil, and a fourth temperature sensor is fixedly mounted on the inner wall of the shell (2); A top cover (1) is fixedly mounted on the top of the shell (2); a first heat-conducting cover (103) is fixedly mounted inside the top cover (1); the first heat-conducting cover (103) is fixedly connected to a third heat-conducting cover (207); and three sets of heat exchange disks (102) are fixedly mounted inside the shell (2); A driving motor (5) is fixedly mounted on the top of the top cover (1), a reduction box is fixedly mounted on the bottom of the driving motor (5), and a driving shaft (501) is fixedly mounted on the bottom of the reduction box; A spiral cover (4) is fixedly mounted on the bottom of the driving shaft (501), a rotating shaft (402) is fixedly mounted at the center of the spiral cover (4), and the top of the rotating shaft (402) is fixedly connected to the driving shaft (501), a plurality of guide grooves (401) are fixedly mounted on the top and bottom surfaces of the spiral cover (4), and a plurality of catalysts are fixedly mounted inside the guide grooves (401); A bottom shell (3) is fixedly mounted on the bottom of the housing (2); a fourth heat-conducting cover (307) is fixedly mounted inside the bottom shell (3), and the fourth heat-conducting cover (307) is fixedly connected to the second heat-conducting cover (203); a heat-conducting plate (306) is fixedly mounted on the inner side of the fourth heat-conducting cover (307), and the heat-conducting plate (306) extends to the inner wall of the bottom shell (3); a third temperature sensor (305) is fixedly mounted on the inner wall of the bottom shell (3); an air intake pipe (301) is fixedly mounted on one side of the bottom shell (3), and an air extraction pump (302) is fixedly mounted on one end of the air intake pipe (301); A controller (202) is fixedly mounted on one side of the housing (2), and the controller (202) is electrically connected to the second heat-conducting cover (203) and the third heat-conducting cover (207), and the controller (202) is electrically connected to the first temperature sensor (104), the second temperature sensor (206), and the fourth temperature sensor, respectively.

2. A phthalic anhydride tail gas treatment device according to claim 1, characterized in that: A guide plate (101) is fixedly mounted inside the top cover (1), a bearing is fixedly mounted at the center of the guide plate (101), and a plurality of air exhaust holes which are narrow at the top and wide at the bottom are provided inside the guide plate (101).

3. A phthalic anhydride tail gas treatment device according to claim 1, characterized in that: A first temperature sensor (104) is fixedly mounted on the inner wall of the top cover (1), and an annular heat sink is fixedly mounted on the inner wall of the top cover (1).

4. A phthalic anhydride tail gas treatment device according to claim 1, characterized in that: An exhaust pipe (105) is fixedly mounted on one side of the top of the top cover (1), and a one-way pipe is fixedly mounted at the connection position between the exhaust pipe (105) and the top cover (1).

5. A phthalic anhydride tail gas treatment device according to claim 1, characterized in that: A mounting plate (204) is fixedly mounted inside the housing (2), and a plurality of material discharge holes are provided inside the mounting plate (204) near the edge thereof, and a through hole is provided at the center of the mounting plate (204).

6. A phthalic anhydride tail gas treatment device according to claim 5, characterized in that: A flow guide cover (205) is fixedly mounted on the top of the mounting plate (204); the flow guide cover (205) is a conical hollow structure, and the flow guide cover (205) is snap-fitted and connected to the rotating shaft (402).

7. A phthalic anhydride tail gas treatment device according to claim 1, characterized in that: A mounting plate (208) is fixedly mounted inside the housing (2), the mounting plate (208) is snap-fitted and connected to the rotating shaft (402), and a plurality of circular holes are formed inside the mounting plate (208).

8. A phthalic anhydride tail gas treatment device according to claim 1, characterized in that: A fixing plate (303) is fixedly mounted on the bottom of the bottom shell (3) via four support frames, and the fixing plate (303) is fixedly connected to the bottom of the air pump (302). A sewage pipe (304) is fixedly mounted on the bottom of the bottom shell (3), and an electric butterfly valve is fixedly mounted at the connection position between the sewage pipe (304) and the bottom shell (3).

9. The method for treating phthalic anhydride tail gas according to claim 1, comprising the following steps: In the first step, the vacuum pump (302) extracts phthalic anhydride tail gas, allowing the phthalic anhydride tail gas to enter the bottom shell (3) through the air inlet pipe (301), and the heat conducting plate (306) inside the fourth heat conducting cover (307) absorbs heat from the phthalic anhydride tail gas entering the bottom shell (3), and transfers the heat to the second heat conducting cover (203), thereby utilizing the waste heat of the phthalic anhydride tail gas to heat the interior of the shell (2); In the second step, the phthalic anhydride tail gas inside the bottom shell (3) is guided by the mounting plate (204) and the guide cover (205) to enter the shell (2), and flows from bottom to top under the guidance of the spiral cover (4), while contacting with the catalyst on the surface of the spiral cover (4), thereby reducing the ignition point of impurities inside the phthalic anhydride tail gas; In the third step, the driving motor (5) is powered on to rotate and drive the spiral cover (4) to rotate. The spiral cover (4) promotes the upward flow of the phthalic anhydride tail gas by forward rotation, or the spiral cover (4) hinders the upward flow of the phthalic anhydride tail gas by reverse rotation, thereby adjusting the reaction time of the phthalic anhydride tail gas inside the shell (2) according to actual use conditions; In a fourth step, the fourth temperature sensor on the inner wall of the shell (2) monitors the reaction environment temperature inside the shell (2), and cooperates with the controller (202) to energize the second heat-conducting cover (203) and the third heat-conducting cover (207) to electrically heat them, so that the environment temperature inside the shell (2) is within the range of 300 to 500 degrees Celsius; In the fifth step, the phthalic anhydride tail gas inside the shell (2) is catalytically incinerated under the action of a catalyst at a temperature of 300 to 500 degrees Celsius, so that impurities in the phthalic anhydride tail gas are burned and removed, and the treated tail gas slowly rises and enters the interior of the top cover (1); In the sixth step, the heat exchange plate (102) absorbs the waste heat of the phthalic anhydride tail gas entering the top cover (1), and transfers the heat to the first heat conductive cover (103). The waste heat is then transferred to the third heat conductive cover (207) through the first heat conductive cover (103) for waste heat recovery and utilization. The phthalic anhydride tail gas is guided by the guide plate (101) and then discharged from the device through the exhaust pipe (105).

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