Phthalic anhydride tail gas treatment equipment

Abstract

The utility model discloses phthalic anhydride tail gas treatment equipment which comprises an incinerator, a gas outlet pipe, a heat exchange box body, a heat exchange pipe, heat exchange fins, a barrier plate and supporting feet, the gas outlet end of the incinerator is communicated with the gas outlet pipe, one end of the gas outlet pipe penetrates into the heat exchange box body, the heat exchange pipe is arranged in the heat exchange box body, and the heat exchange fins are arranged in the heat exchange pipe. The heat exchange pipe is distributed in an S shape, heat exchange fins are arranged on the outer wall of the heat exchange pipe, blocking plates are arranged on the inner top wall and the inner bottom wall of the heat exchange box body, the supporting legs are arranged below the incinerator and the heat exchange box body, the multiple heat exchange fins are arranged, and the heat exchange fins are arranged in the heat exchange box body. The multiple heat exchange fins are fixedly installed on the outer wall of the heat exchange pipe, the multiple blocking plates are arranged at equal intervals and distributed in parallel, high-temperature tail gas generated after incineration of the incinerator can be recycled, resource waste is avoided, and heat energy is effectively utilized.

Description

Technical Field

[0001] The utility model relates to the technical field of tail gas treatment, in particular to the technical field of a phthalic anhydride tail gas treatment device.

Background Art

[0002] Phthalic anhydride generally refers to phthalic anhydride, which is an organic compound with the molecular formula C8H4O3. It is a cyclic anhydride formed by the internal dehydration of phthalic acid molecules. Phthalic anhydride is a white solid and is an important raw material in the chemical industry, especially used in the manufacture of plasticizers.

[0003] However, due to the particularity of phthalic anhydride, it is often discharged into the pipelines in front of the incinerator and the furnace channels, and a certain amount of phthalic anhydride solid particles will precipitate due to the low temperature, resulting in easy blockage of the pipelines or poor operation of the switching valve connecting rod of the furnace body after crystallization.

[0004] To solve the problems raised in the background art, for example, the patent application No. CN201721284101.1 discloses a phthalic anhydride tail gas treatment device, which includes a phthalic anhydride production kettle, a heat exchanger, an incinerator and a smoke exhaust device; a steam discharge port is arranged at the upper end of the phthalic anhydride production kettle, and a tail gas discharge port is arranged at the lower end of the phthalic anhydride production kettle; the heat exchanger includes a heat exchanger body, a steam delivery pipe and a condensate discharge pipe, the tail gas discharge port is connected to the heat exchanger body, and one end of the steam delivery pipe is connected to the steam discharge port. Through the setting of the heat exchanger, the tail gas introduced into the incinerator is heated to prevent the occurrence of a certain amount of phthalic anhydride solid particles precipitated due to the low temperature, so as to achieve the purpose of continuous operation of the incinerator. However, this device still has the following defects:

[0005] During the phthalic anhydride extraction process, the tail gas generated after the incinerator burns all carries heat, but this device lacks a heat recovery structure, resulting in the inability to recycle the high-temperature tail gas generated after the incinerator burns, causing waste of resources and thus reducing the practicability of this device.

Content of the Utility Model

[0006] The purpose of the utility model is to solve the problems in the prior art, and propose a phthalic anhydride tail gas treatment device, which can recycle the high-temperature tail gas generated after the incinerator burns, avoid waste of resources, and effectively utilize heat energy.

[0007] To achieve the above object, the present utility model provides a phthalic anhydride tail gas treatment device, which includes an incinerator, an air outlet pipe, a heat exchange box body, heat exchange pipes, heat exchange fins, baffle plates, and support feet. The air outlet end of the incinerator is communicated with an air outlet pipe, one end of the air outlet pipe penetrates into the interior of the heat exchange box body, heat exchange pipes are arranged inside the heat exchange box body, the heat exchange pipes are distributed in an S shape, heat exchange fins are arranged on the outer walls of the heat exchange pipes, baffle plates are arranged on both the inner top wall and the inner bottom wall of the heat exchange box body, and several support feet are arranged below both the incinerator and the heat exchange box body.

[0008] Preferably, a plurality of the heat exchange fins are provided, and the plurality of heat exchange fins are fixedly installed on the outer walls of the heat exchange pipes.

[0009] Preferably, a plurality of the baffle plates are provided, and the plurality of baffle plates are arranged at equal intervals and distributed parallel to each other.

[0010] Preferably, an exhaust pipe is arranged outside the heat exchange box body, the exhaust pipe communicates with the interior of the heat exchange box body, and valves are equipped on both the exhaust pipe and the air outlet pipe.

[0011] Preferably, a water inlet pipe and a water outlet pipe are respectively arranged outside the heat exchange box body. One end of the water inlet pipe penetrates into the interior of the heat exchange box body and is connected to the water inlet end of the heat exchange pipe, one end of the water outlet pipe penetrates into the interior of the heat exchange box body and is connected to the water outlet end of the heat exchange pipe, and valves are equipped on both the water inlet pipe and the water outlet pipe.

[0012] Preferably, a water tank and a circulation pump are arranged above the outside of the heat exchange box body. The water outlet end of the water tank is connected to the other end of the water inlet pipe, the input end of the circulation pump is connected to the other end of the water outlet pipe through a water suction pipe, and the output end of the circulation pump is connected to the water tank through a water delivery pipe.

[0013] The beneficial effects of the present utility model:

[0014] 1. By the combined use of the heat exchange box body and the heat exchange pipes, the utility model can recycle the high-temperature tail gas generated after the incinerator burns. When the temperature of the tail gas rises after being processed by the incinerator, after opening the valve, the high-temperature tail gas can enter the heat exchange box body through the air outlet pipe. Then, after opening the valve, the cold water in the water tank can be injected into the heat exchange pipes through the water inlet pipe, so that the heat of the high-temperature tail gas is transferred to the wall surface of the heat exchange pipes through heat conduction. In this application, the wall surface of the heat exchange pipes is made of a metal material with high thermal conductivity to effectively conduct heat. As the heat is conducted, the temperature of the high-temperature tail gas gradually decreases, while the temperature of the wall surface of the heat exchange pipes gradually rises, thereby increasing the temperature of the cold water inside the heat exchange pipes, so as to achieve the purpose of heat exchange and avoid waste of resources, solving the problem that the lack of a heat recovery structure results in the inability to recycle the high-temperature tail gas generated after the incinerator burns.

[0015] 2. By setting heat exchange fins, when the heat source of the high-temperature tail gas flows through the heat exchange fins, its heat is conducted through the contact surface between the heat exchange fins and the pipe wall, and then spreads to a larger surface area through the heat exchange fins, increasing the heat exchange area between the heat source and the heat exchange pipes. At the same time, the heat source flows between the heat exchange fins, forming a convection, strengthening the heat transfer, and thus improving the heat exchange efficiency of the tail gas.

[0016] 3. By setting a baffle plate, the high-temperature tail gas can be blocked, effectively reducing the discharge speed of the high-temperature tail gas, enabling the high-temperature tail gas to stay in the heat exchange box body for a long time, and thus improving the heat exchange efficiency of the tail gas.

BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the front view of a phthalic anhydride tail gas treatment device of the utility model;

[0018] Figure 2 is the internal sectional view of the heat exchange box body of a phthalic anhydride tail gas treatment device of the utility model;

[0019] Figure 3 is the schematic diagram of the heat exchange pipes of a phthalic anhydride tail gas treatment device of the utility model;

[0020] In the figure: 1 - incinerator, 2 - air outlet pipe, 3 - heat exchange box body, 4 - heat exchange pipes, 5 - heat exchange fins, 6 - baffle plate, 7 - support feet, 8 - exhaust pipe, 9 - water inlet pipe, 10 - water outlet pipe, 11 - water tank, 12 - circulation pump, 13 - water suction pipe, 14 - water transfer pipe.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] Refer to Figures 1 to 3, a phthalic anhydride tail gas treatment device of the present utility model, comprising an incinerator 1, an air outlet pipe 2, a heat exchange box body 3, heat exchange pipes 4, heat exchange fins 5, baffle plates 6, and support feet 7. The air outlet end of the incinerator 1 is communicated with the air outlet pipe 2. One end of the air outlet pipe 2 penetrates into the interior of the heat exchange box body 3. Heat exchange pipes 4 are arranged inside the heat exchange box body 3. The heat exchange pipes 4 are distributed in an S shape. Heat exchange fins 5 are arranged on the outer wall of the heat exchange pipes 4. Baffle plates 6 are arranged on both the inner top wall and the inner bottom wall of the heat exchange box body 3. Several support feet 7 are arranged below both the incinerator 1 and the heat exchange box body 3.

[0022] Refer to Figure 2 and Figure 3 , a phthalic anhydride tail gas treatment device of the present utility model. A plurality of heat exchange fins 5 are provided. The plurality of heat exchange fins 5 are all fixedly installed on the outer wall of the heat exchange pipes 4. By arranging a plurality of heat exchange fins 5, when the heat source of the high-temperature tail gas flows through the heat exchange fins 5, its heat is conducted through the contact surface between the heat exchange fins 5 and the pipe wall, and then spreads to a larger surface area through the heat exchange fins 5, increasing the heat exchange area between the heat source and the heat exchange pipes 4. At the same time, the heat source flows between the heat exchange fins 5 to form a convection, strengthening the heat transfer, and thus improving the heat exchange efficiency of the tail gas.

[0023] Refer to Figure 2 , a phthalic anhydride tail gas treatment device of the present utility model. A plurality of baffle plates 6 are provided. The plurality of baffle plates 6 are arranged at equal intervals and are parallel to each other. By arranging a plurality of baffle plates 6, the high-temperature tail gas can be blocked, effectively reducing the discharge speed of the high-temperature tail gas, enabling the high-temperature tail gas to stay in the heat exchange box body 3 for a long time, and thus improving the heat exchange efficiency of the tail gas.

[0024] Refer to Figure 2 , a phthalic anhydride tail gas treatment device of the present utility model. An exhaust pipe 8 is arranged outside the heat exchange box body 3. The exhaust pipe 8 is communicated with the interior of the heat exchange box body 3. Valves are equipped on both the exhaust pipe 8 and the air outlet pipe 2. After the heat exchange of the high-temperature tail gas is completed, the valve can be opened to discharge it outward from the exhaust pipe 8.

[0025] Refer to Figure 1 and Figure 2, a phthalic anhydride tail gas treatment device of the present utility model. An inlet water pipe 9 and an outlet water pipe 10 are respectively arranged outside the heat exchange box body 3. One end of the inlet water pipe 9 penetrates into the interior of the heat exchange box body 3 and is connected to the water inlet end of the heat exchange pipe 4. One end of the outlet water pipe 10 penetrates into the interior of the heat exchange box body 3 and is connected to the water outlet end of the heat exchange pipe 4. Valves are equipped on both the inlet water pipe 9 and the outlet water pipe 10. When the temperature of the tail gas rises after being processed by the incinerator 1, after opening the valve, the high-temperature tail gas can enter the heat exchange box body 3 through the outlet pipe 2. Then, after opening the valve, the cold water in the water tank 11 can be injected into the heat exchange pipe 4 through the inlet water pipe 9, so that the heat of the high-temperature tail gas is transferred to the wall surface of the heat exchange pipe 4 through heat conduction. In this application, the wall surface of the heat exchange pipe 4 is made of a metal material with high thermal conductivity to effectively conduct heat. With the conduction of heat, the temperature of the high-temperature tail gas gradually decreases, while the temperature of the wall surface of the heat exchange pipe 4 gradually rises, thereby increasing the temperature of the cold water inside the heat exchange pipe 4, so as to achieve the purpose of heat exchange.

[0026] Refer to Figure 1 and Figure 2 , a phthalic anhydride tail gas treatment device of the present utility model. A water tank 11 and a circulation pump 12 are arranged above the outside of the heat exchange box body 3. The water outlet end of the water tank 11 is connected to the other end of the inlet water pipe 9. The input end of the circulation pump 12 is connected to the other end of the outlet water pipe 10 through a water extraction pipe 13. The output end of the circulation pump 12 is connected to the water tank 11 through a water transmission pipe 14. After starting the circulation pump 12 through an external power source, the circulation pump 12 extracts the water body after heat exchange through the water extraction pipe 13 and transports the water body to the water tank 11 through the water transmission pipe 14, and circulates in this way until all the water in the water tank 11 becomes hot water, so as to achieve the purpose of making the water body uniformly heated, without the need to inject cold water while discharging hot water, greatly improving the processing efficiency.

[0027] The working process of the present utility model:

[0028] During the operation of a phthalic anhydride tail gas treatment device of the present utility model, when the temperature of the tail gas rises after being processed by the incinerator 1, after opening the valve, the high-temperature tail gas can enter the heat exchange box body 3 through the air outlet pipe 2. Then, after opening the valve, the cold water in the water tank 11 can be injected into the heat exchange pipe 4 through the water inlet pipe 9, so that the heat of the high-temperature tail gas is transferred to the wall surface of the heat exchange pipe 4 through heat conduction. In this application, the wall surface of the heat exchange pipe 4 is made of a metal material with high thermal conductivity to effectively conduct heat. As the heat is conducted, the temperature of the high-temperature tail gas gradually decreases, while the temperature of the wall surface of the heat exchange pipe 4 gradually rises, thereby increasing the temperature of the cold water inside the heat exchange pipe 4, so as to achieve the purpose of heat exchange. After the initial heat exchange is completed, subsequently, after starting the circulation pump 12 through an external power source, the circulation pump 12 pumps out the water body after heat exchange through the water extraction pipe 13 and transports the water body to the water tank 11 through the water transmission pipe 14, and this process is repeated until all the water in the water tank 11 becomes hot water, thereby achieving the purpose of uniform heating of the water body. There is no need to inject cold water while discharging hot water, which greatly improves the processing efficiency.

[0029] The control mode of the present utility model is controlled by manually starting and closing the switch. The wiring diagram of the power element and the power supply are common knowledge in the art, and the present utility model is mainly used to protect mechanical devices, so the control mode and wiring layout of the present utility model will not be explained in detail.

[0030] The above embodiments are illustrative of the present utility model, not limiting the present utility model. Any simple transformation of the present utility model belongs to the protection scope of the present utility model.

Claims

1. A phthalic anhydride tail gas treatment device, characterized in that: It includes an incinerator (1), an air outlet pipe (2), a heat exchange box body (3), heat exchange pipes (4), heat exchange fins (5), baffle plates (6), and support feet (7). The air outlet end of the incinerator (1) is communicated with the air outlet pipe (2). One end of the air outlet pipe (2) penetrates into the interior of the heat exchange box body (3). Heat exchange pipes (4) are arranged inside the heat exchange box body (3). The heat exchange pipes (4) are distributed in an S shape. Heat exchange fins (5) are arranged on the outer wall of the heat exchange pipes (4). Baffle plates (6) are arranged on both the inner top wall and the inner bottom wall of the heat exchange box body (3). A plurality of the support feet (7) are arranged below both the incinerator (1) and the heat exchange box body (3).

2. The phthalic anhydride tail gas treatment device according to claim 1, wherein: A plurality of the heat exchange fins (5) are provided. A plurality of the heat exchange fins (5) are all fixedly installed on the outer wall of the heat exchange pipes (4).

3. The phthalic anhydride tail gas treatment device according to claim 1, characterized in that: A plurality of the baffle plates (6) are provided. The plurality of the baffle plates (6) are arranged at equal intervals and are distributed in parallel with each other.

4. The phthalic anhydride tail gas treatment equipment according to claim 1, wherein: An exhaust pipe (8) is arranged outside the heat exchange box body (3). The exhaust pipe (8) is communicated with the interior of the heat exchange box body (3). Valves are equipped on both the exhaust pipe (8) and the air outlet pipe (2).

5. The phthalic anhydride tail gas treatment equipment according to claim 1, characterized in that: A water inlet pipe (9) and a water outlet pipe (10) are respectively arranged outside the heat exchange box body (3). One end of the water inlet pipe (9) penetrates into the interior of the heat exchange box body (3) and is connected to the water inlet end of the heat exchange pipes (4). One end of the water outlet pipe (10) penetrates into the interior of the heat exchange box body (3) and is connected to the water outlet end of the heat exchange pipes (4). Valves are equipped on both the water inlet pipe (9) and the water outlet pipe (10).

6. The phthalic anhydride tail gas treatment equipment according to claim 5, characterized in that: A water tank (11) and a circulation pump (12) are arranged above the outside of the heat exchange box body (3). The water outlet end of the water tank (11) is connected to the other end of the water inlet pipe (9). The input end of the circulation pump (12) is connected to the other end of the water outlet pipe (10) through a water suction pipe (13). The output end of the circulation pump (12) is connected to the water tank (11) through a water delivery pipe (14).

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