Waste heat recovery equipment for phthalic anhydride production unit

Abstract

This utility model belongs to the field of phthalic anhydride production technology, specifically relating to a waste heat recovery and utilization device for a phthalic anhydride production apparatus. It includes a recovery tank, a drain outlet fixedly connected to the lower end of the recovery tank, an air inlet fixedly connected to the left side of the recovery tank, a water tank fixedly connected to the upper end of the recovery tank, a purification tank fixedly connected to the upper end of the water tank, a waste heat recovery and utilization mechanism in the water tank, a purification mechanism inside the purification tank, a discharge hood fixedly connected to the upper end of the purification tank, and an exhaust port fixedly connected to the upper end of the purification tank. This utility model utilizes a bent pipe passing through the interior of the water tank to transport heat into the water tank, thereby increasing heat utilization. The bent pipe also reduces the heat emission rate, prolonging the heat residence time inside the water tank and increasing the heating effect. The air inlet hood further enhances the heat transport and emission into the bent pipe, maximizing heat utilization.

Description

Technical Field

[0001] This utility model relates to the field of phthalic anhydride production technology, specifically to a waste heat recovery and utilization device for a phthalic anhydride production apparatus. Background Technology

[0002] Methyl phthalic anhydride, or phthalic anhydride for short, is a cyclic anhydride formed by the intramolecular dehydration of phthalic acid. It is a white solid with the molecular formula C6H4(CO)2O and is an important raw material in the chemical industry, especially in the manufacture of plasticizers. The production of phthalic anhydride generates heat. Phthalic anhydride is a white, needle-like crystal that is sublimable. During sublimation, it produces fumes with an irritating odor. If inhaled, these fumes can irritate the respiratory tract, causing symptoms such as coughing and sneezing. Furthermore, phthalic anhydride has a relatively low melting point of 131.6℃, and it melts easily at higher temperatures, which increases the risk of leakage.

[0003] Utility model patent CN107061232A discloses a waste heat recovery and utilization device, including an air compressor without a cooling system, a heat exchange device, a room temperature water supply device, a water storage device, and an air handling device. The heat exchange device has an air inlet, an air outlet, a water inlet, and a water outlet. The air inlet of the heat exchange device is connected to the compressed gas outlet of the air compressor via an air pipe, and the air outlet is connected to the air handling device via an air pipe. The water inlet of the heat exchange device is connected to the room temperature water supply device via a water supply pipe, and the water outlet of the heat exchange device is connected to the water storage device via an outlet pipe. This device utilizes the heat exchange device to exchange heat between the high-temperature, high-pressure gas generated by the air compressor and the room temperature water introduced into the heat exchange device, thereby cooling the gas and heating the room temperature water. The cooled gas is used for industrial production, and the heated water is used for hot water supply, improving energy utilization efficiency.

[0004] Currently, the production of phthalic anhydride generates a large amount of heat. Directly releasing this heat with the gas not only harms the environment, but also, as is often done, the heat is transferred to the lower part of the furnace body to heat it. However, this only heats the lower part of the furnace body, and the heat is easily dissipated and cannot be fully utilized. At the same time, harmful elements in the gas also cause adverse environmental damage. Activated carbon filters are used to purify these harmful elements, but these filters are not very durable and are easily deformed and damaged, thus affecting their use. Utility Model Content

[0005] The purpose of this invention is to provide a waste heat recovery and utilization device for a phthalic anhydride production plant, which solves the problems of heat recovery and utilization in the gas and purification of harmful elements in the gas.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a waste heat recovery and utilization device for a phthalic anhydride production unit, comprising a recovery box, a drain outlet fixedly connected to the lower end of the recovery box, an air inlet fixedly connected to the left side of the recovery box, a water tank fixedly connected to the upper end of the recovery box, a purification box fixedly connected to the upper end of the water tank, a waste heat recovery and utilization mechanism in the water tank, a purification mechanism inside the purification box, a discharge hood fixedly connected to the upper end of the purification box, an exhaust port fixedly connected to the upper end of the purification box, a water inlet fixedly connected to the upper left side of the water tank, and a drain outlet fixedly connected to the lower right side of the water tank.

[0007] Preferably, the waste heat recovery and utilization mechanism includes a bent pipe, the bent pipe is fixedly connected inside the water tank, an air inlet is fixedly connected to the lower end of the bent pipe, and an exhaust port is fixedly connected to the upper end of the bent pipe.

[0008] Preferably, the air inlet is fixedly connected to an air inlet cover, the upper part of the air inlet cover is fixedly connected to a filter screen, the upper part of the air inlet cover is fixedly connected to the lower left side of the water tank, and the air inlet cover is fixedly connected to the inner left side of the recycling bin.

[0009] Preferably, the air inlet is fixedly passed through the lower left side of the water tank, and the exhaust nozzle is fixedly passed through the upper right side of the water tank.

[0010] Preferably, the purification mechanism includes a reinforcing ring, and the inside of the purification box is fixedly connected to the reinforcing ring, and the inside of the reinforcing ring is fixedly connected to an activated carbon filter.

[0011] Preferably, a lower reinforcing mesh is fixedly connected to the lower end of the activated carbon filter screen, and an upper reinforcing mesh is fixedly connected to the upper end of the activated carbon filter screen. The lower and upper reinforcing meshes are respectively fixedly connected inside the reinforcing ring.

[0012] Preferably, the lower end of the reinforcing mesh is fixedly connected to the left and right sides of the lower end, and the lower end of the top rod is fixedly connected to the inside of the purification box.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] 1. This utility model uses a bent pipe to pass through the inside of the water tank, thereby increasing the utilization of heat. The bent pipe also reduces the heat emission rate and prolongs the time that heat stays inside the water tank, thus increasing the heating effect. The air inlet hood further increases the heat transmission and emission into the bent pipe, thereby increasing the heat utilization effect.

[0015] 2. This utility model uses a reinforcing ring to wrap the activated carbon filter screen. The upper end of the activated carbon filter screen is reinforced by an upper reinforcing net, and the lower end is reinforced by a lower reinforcing net, thereby increasing the support and limiting of the activated carbon filter screen, improving the performance and service life of the activated carbon filter screen, and reducing the probability of damage. Attached Figure Description

[0016] Figure 1 This is a perspective view of the overall structure of this utility model;

[0017] Figure 2 This is a partial sectional view of the overall structure of this utility model;

[0018] Figure 3 This is a partial three-dimensional structure of the present invention. Figure 1 ;

[0019] Figure 4 This is a partial three-dimensional structure of the present invention. Figure 2 .

[0020] In the diagram: 1. Recycling bin; 2. Sewage outlet; 3. Air inlet; 4. Water tank; 5. Purification box; 6. Waste heat recovery and utilization mechanism; 7. Purification mechanism; 8. Discharge hood; 9. Exhaust outlet; 10. Water inlet; 11. Drain outlet; 61. Bend; 62. Air inlet nozzle; 63. Exhaust nozzle; 64. Air inlet hood; 65. Filter screen; 71. Reinforcing ring; 72. Activated carbon filter screen; 73. Lower reinforcing mesh; 74. Upper reinforcing mesh; 75. Top rod. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4A waste heat recovery and utilization device for a phthalic anhydride production unit includes a recovery tank 1 for recovering gas. A drain port 2 is fixedly connected to the lower end of the recovery tank 1 to discharge dirt from its interior. An air inlet 3 is fixedly connected to the left side of the recovery tank 1. A water tank 4 is fixedly connected to the upper end of the recovery tank 1, and a purification tank 5 is fixedly connected to the upper end of the water tank 4. The water tank 4 is equipped with a waste heat recovery and utilization mechanism 6. A purification mechanism 7 is installed inside the purification tank 5, and an exhaust hood 8 is fixedly connected to the upper interior of the purification tank 5. The upper end of the purification box 5 is fixedly connected to an exhaust port 9. The exhaust hood 8 facilitates gas discharge. The upper left side of the water tank 4 is fixedly connected to a water inlet 10. Water is delivered into the water tank 4 through the water inlet 10 and discharged from the water tank 4 through the drain port 11. The lower right side of the water tank 4 is fixedly connected to a drain port 11. This technical solution improves upon the problems mentioned in the background technology. Other technical problems of this technical solution are existing technologies and will not be described in detail here.

[0023] Please see Figure 1 , Figure 2 , Figure 4 The waste heat recovery and utilization mechanism 6 includes a bent pipe 61. The bent pipe 61 is fixedly connected inside the water tank 4. An air inlet 62 is fixedly connected to the lower end of the bent pipe 61, and an exhaust nozzle 63 is fixedly connected to the upper end of the bent pipe 61. An air inlet hood 64 is fixedly connected to the air inlet 62. The air inlet hood 64 facilitates the delivery of gas to the air inlet 62. A filter screen 65 is fixedly connected to the upper end of the air inlet hood 64. The upper end of the air inlet hood 64 is fixedly connected to the lower left side of the water tank 4. The air inlet hood 64 is fixedly connected to the inner left side of the recovery box 1. The air inlet 62 passes through the lower left side of the water tank 4, and the exhaust nozzle 63 passes through the upper right side of the water tank 4.

[0024] Please see Figure 1 , Figure 2 , Figure 3 The purification mechanism 7 includes a reinforcing ring 71. The reinforcing ring 71 is fixedly connected inside the purification box 5. An activated carbon filter 72 is fixedly connected inside the reinforcing ring 71. A lower reinforcing net 73 is fixedly connected to the lower end of the activated carbon filter 72. An upper reinforcing net 74 is fixedly connected to the upper end of the activated carbon filter 72. The lower reinforcing net 73 and the upper reinforcing net 74 are respectively fixedly connected inside the reinforcing ring 71. Top rods 75 are fixedly connected to the left and right sides of the lower end of the lower reinforcing net 73. The lower reinforcing net 73 is supported and reinforced by the top rods 75. The lower end of the top rods 75 is fixedly connected inside the purification box 5.

[0025] The specific implementation process of this utility model is as follows: First, the gas is discharged into the inside of the recovery box 1 through the air inlet 3, and then discharged into the inner wall of the air inlet hood 64. At the same time, it is filtered through the filter screen 65. Then, the dirt in the gas is filtered to the lower end of the filter screen 65 and moved to the lower end of the inside of the recovery box 1. It can be discharged by opening the drain port 2. Then, the gas is transported to the bend pipe 61 through the air inlet 62, and then to the exhaust port 63 through the bend pipe 61. Then, it is discharged through the exhaust port 63 and transported into the inside of the purification box 5.

[0026] Then, the harmful elements are filtered and purified through the lower reinforcing mesh 73 and the activated carbon filter 72, and then conveyed to the emission hood 8 through the upper reinforcing mesh 74, and finally discharged through the exhaust port 9.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A waste heat recovery and utilization device for a phthalic anhydride production unit, comprising a recovery tank (1), characterized in that: The lower end of the recycling box (1) is fixedly connected to a drain outlet (2), the left side of the recycling box (1) is fixedly connected to an air inlet (3), the upper end of the recycling box (1) is fixedly connected to a water tank (4), the upper end of the water tank (4) is fixedly connected to a purification box (5), the water tank (4) is equipped with a waste heat recovery and utilization mechanism (6), the purification box (5) is equipped with a purification mechanism (7), the upper end of the purification box (5) is fixedly connected to a discharge hood (8), the upper end of the purification box (5) is fixedly connected to an exhaust outlet (9), the upper left side of the water tank (4) is fixedly connected to a water inlet (10), and the lower right side of the water tank (4) is fixedly connected to a drain outlet (11).

2. The waste heat recovery and utilization equipment for a phthalic anhydride production unit according to claim 1, characterized in that: The waste heat recovery and utilization mechanism (6) includes a bent pipe (61), the bent pipe (61) is fixedly connected inside the water tank (4), the lower end of the bent pipe (61) is fixedly connected to an air inlet (62), and the upper end of the bent pipe (61) is fixedly connected to an exhaust outlet (63).

3. The waste heat recovery and utilization equipment for a phthalic anhydride production unit according to claim 2, characterized in that: The air inlet (62) is fixedly connected to the air inlet cover (64), and the upper part of the air inlet cover (64) is fixedly connected to the filter screen (65). The upper part of the air inlet cover (64) is fixedly connected to the lower left side of the water tank (4), and the air inlet cover (64) is fixedly connected to the inner left side of the recycling box (1).

4. The waste heat recovery and utilization equipment for a phthalic anhydride production unit according to claim 2, characterized in that: The air inlet (62) is fixedly passed through the lower left side of the water tank (4), and the exhaust nozzle (63) is fixedly passed through the upper right side of the water tank (4).

5. The waste heat recovery and utilization equipment for a phthalic anhydride production unit according to claim 1, characterized in that: The purification mechanism (7) includes a reinforcing ring (71), and the inside of the purification box (5) is fixedly connected to the reinforcing ring (71), and the inside of the reinforcing ring (71) is fixedly connected to the activated carbon filter (72).

6. The waste heat recovery and utilization equipment for a phthalic anhydride production unit according to claim 5, characterized in that: The lower end of the activated carbon filter (72) is fixedly connected to a lower reinforcing mesh (73), and the upper end of the activated carbon filter (72) is fixedly connected to an upper reinforcing mesh (74). The lower reinforcing mesh (73) and the upper reinforcing mesh (74) are respectively fixedly connected to the inside of the reinforcing ring (71).

7. The waste heat recovery and utilization equipment for a phthalic anhydride production unit according to claim 6, characterized in that: The lower end of the reinforcing mesh (73) is fixedly connected to the left and right sides of the lower end with top rods (75), and the lower end of the top rods (75) is fixedly connected to the inside of the purification box (5).

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