A waste heat recovery device for petrochemical production

Abstract

The utility model discloses a kind of waste heat recovery devices of petroleum chemical production, it is related to petroleum chemical industry, including device shell, the device shell outer wall is equipped with waste heat import pipe and waste heat export pipe, the flange of device shell end portion is equipped with medium circulation cavity, and medium circulation cavity outer wall is equipped with heat exchange medium inlet pipe and heat exchange medium outlet pipe, the device shell inside is equipped with heat exchange pipe, the device shell inner wall is equipped with spoiler, and spoiler outer wall is equipped with flow guide hole, the device shell outer wall is equipped with heat preservation layer, the waste heat import pipe end portion is equipped with the filtering mechanism for filtering waste heat. The waste heat recovery device of petroleum chemical production, by multiple spoiler structure, both prolong high-temperature waste heat medium residence time, avoid heat exchange short circuit, also destroy heat exchange pipe boundary layer to reduce thermal resistance, increase contact area, greatly improve heat exchange efficiency, while filtering mechanism can avoid impurity influence heat exchange efficiency.

Description

Technical Field

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

[0002] In the petrochemical production process, a large amount of high-temperature media with waste heat, such as high-temperature flue gas, are generated. If these high-temperature media are directly discharged, it will not only cause a lot of energy waste, but also cause certain thermal pollution to the environment. It is necessary to recover and utilize the waste heat through waste heat recovery devices.

[0003] In the prior art, Chinese Patent No. CN216770282U discloses a waste heat recovery and utilization device for petrochemical production, including an insulated box, a heat exchange tube installed inside the insulated box, a serpentine tube installed inside the heat exchange tube, a connection port opened on one side of the heat exchange tube, the water inlet end of the serpentine tube inserted into the connection port, a water pump installed at the bottom of the inner wall of the insulated box, the water outlet end of the water pump connected to the water inlet end of the serpentine tube, a through hole opened at the upper side of one side of the insulated box, the water outlet end of the serpentine tube inserted through the through hole and connected to a U-shaped tube, a water outlet opened on one side of the insulated box, an air outlet pipe installed at the lower side of one side of the heat exchange tube, a drying box installed at the upper part of the insulated box, and a placement plate installed on the inner wall of the drying box. The water pipe is set in a serpentine and U-shape to increase the heating time, so that the water can be heated to a higher temperature in the waste heat utilization device, and more water can be heated. Through the drying box, chemical raw materials can be dried, and waste heat can be reused.

[0004] Based on the above information, the heat exchange structure of existing waste heat recovery devices is relatively simple, typically employing only simple tubular heat exchangers with limited heat exchange area. Furthermore, the flow path of the high-temperature medium within the heat exchanger is fixed, which easily leads to uneven heat exchange and low waste heat recovery efficiency. On the other hand, the high-temperature media generated in petrochemical production often contain a large amount of impurities and dust. These impurities and dust easily adhere to the heat exchanger surface, accumulating over time to form thick scale, significantly reducing the heat exchanger's efficiency. Therefore, further improvements are needed. Utility Model Content

[0005] The purpose of this utility model is to provide a waste heat recovery device for petrochemical production, in order to solve the problems mentioned in the background art. The heat exchange structure of the existing waste heat recovery devices is relatively simple, usually only using simple tubular heat exchangers with limited heat exchange area. Moreover, the flow path of the high-temperature medium inside the heat exchanger is fixed, which easily leads to uneven heat exchange and low waste heat recovery efficiency. On the other hand, the high-temperature medium generated in petrochemical production often contains a lot of impurities and dust. These impurities and dust easily adhere to the heat exchange surface of the heat exchanger, and accumulate over a long period of time to form thick scale, which greatly reduces the heat exchange efficiency.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a waste heat recovery device for petrochemical production, comprising a device shell, a waste heat inlet pipe and a waste heat outlet pipe on the outer wall of the device shell, a medium circulation chamber installed on the end flange of the device shell, and a heat exchange medium inlet pipe and a heat exchange medium outlet pipe on the outer wall of the medium circulation chamber, a heat exchange pipe inside the device shell, a baffle plate on the inner wall of the device shell, and a flow guide hole on the outer wall of the baffle plate, a heat insulation layer on the outer wall of the device shell, and a filter mechanism for filtering waste heat at the end of the waste heat inlet pipe.

[0007] Furthermore, the insulation layer covers the outer wall of the device shell, and the insulation layer is made of rock wool insulation material. The waste heat inlet pipe is located at the bottom of the device shell away from the medium circulation chamber, and the waste heat outlet pipe is located at the top of the device shell close to the medium circulation chamber. The bottom of the device shell is provided with a drain pipe for condensate discharge, and the outer wall of the drain pipe is provided with a valve.

[0008] Furthermore, the heat exchange tube is U-shaped and set at equal angles, with its ends connected to the medium circulation chamber. Both the outer wall of the heat exchange tube and the inner wall of the device housing are coated with a corrosion-resistant layer.

[0009] Furthermore, the outer wall of the heat exchange tube is provided with a turbulence flange, and the turbulence flange is spirally wound around the outer wall of the heat exchange tube, and the outer wall of the turbulence flange is designed with an arc shape.

[0010] Furthermore, the baffle plate is designed in a spiral shape and extends axially along the inner wall of the device housing. The baffle plate is fixedly connected to the heat exchange tube. The spiral direction of the baffle plate is opposite to that of the baffle flange. The bottom of the baffle plate has a notch for condensate to flow through. The guide holes penetrate the surface of the baffle plate and are distributed in an array.

[0011] Furthermore, the filtration mechanism includes a filter box fixedly installed at the end of the waste heat inlet pipe, and a connecting pipe is fixedly installed on the outer wall of the filter box, and the connecting pipe is connected to a heat source. A sealing cover is slidably installed on the outer wall of the filter box, and a first filter plate and a second filter plate are fixedly installed at the end of the sealing cover.

[0012] Furthermore, the filter box is provided with a filter chamber, and the two ends of the filter chamber are respectively connected to the waste heat inlet pipe and the connecting pipe. The first filter plate and the second filter plate are located between the waste heat inlet pipe and the connecting pipe, and the first filter plate is close to the connecting pipe, and the filter pore diameter of the first filter plate is larger than that of the second filter plate.

[0013] Furthermore, a sealing ring is provided between the sealing cover and the filter box, and the sealing ring is made of a high-temperature resistant material. A handle is provided on the outer wall of the sealing cover.

[0014] Compared with the prior art, the beneficial effects of this utility model are: 1. This waste heat recovery device for petrochemical production significantly improves heat exchange efficiency through a multi-layered turbulence structure. The spiral turbulence plate inside the shell cooperates with the reverse spiral turbulence flange on the outer wall of the heat exchange tube to extend the residence time of the high-temperature waste heat medium and avoid heat exchange short circuits, while also breaking the boundary layer of the heat exchange tube to reduce thermal resistance and increase the contact area. The guide holes and bottom notches of the turbulence plate can also ensure uniform flow of the medium and discharge of condensate, effectively solving the problems of uneven heat exchange and low efficiency in traditional devices.

[0015] 2. The filtration mechanism can prevent impurities from affecting heat exchange efficiency; the first and second filter plates in the filter box intercept impurities in stages to prevent dirt from adhering; the sliding sealing cover with high-temperature resistant sealing ring ensures sealing and facilitates easy pull-out maintenance and cleaning without disassembling the device, solving the pain points of existing equipment that suffer from reduced efficiency and difficult maintenance due to impurity accumulation.

[0016] 3. Excellent thermal insulation, energy saving, safety and durability; rock wool insulation layer reduces heat loss, drain pipe drains condensate in time to prevent corrosion; heat exchange tubes and inner wall of shell are coated with corrosion resistant layer to adapt to chemical working conditions, U-shaped heat exchange tubes are arranged at equal angles to increase heat exchange area in limited space, taking into account compactness and practicality, and extending the service life of the equipment. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the overall structure of this utility model from another perspective; Figure 3 This is a schematic diagram of the internal structure of the device housing of this utility model; Figure 4 This is a schematic diagram of the spoiler structure of this utility model; Figure 5 This is a schematic diagram of the heat exchange tube structure of this utility model; Figure 6 This is a schematic diagram of the cross-sectional structure of the filter box of this utility model; Figure 7 This is a schematic diagram of the sealing cover and the first filter plate of this utility model.

[0018] In the diagram: 1. Device shell; 101. Waste heat inlet pipe; 102. Waste heat outlet pipe; 2. Heat exchange pipe; 201. Turbulence flange; 3. Medium circulation chamber; 301. Heat exchange medium inlet pipe; 302. Heat exchange medium outlet pipe; 4. Drain pipe; 401. Valve; 5. Turbulence plate; 501. Guide hole; 6. Insulation layer; 7. Corrosion resistant layer; 8. Filter box; 801. Connecting pipe; 9. Sealing cover plate; 901. First filter plate; 902. Second filter plate; 903. Sealing ring; 904. Handle. Detailed Implementation

[0019] 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.

[0020] Example 1: Please refer to Figures 1-5 The present invention provides the following technical solution: a waste heat recovery device for petrochemical production, comprising a device shell 1, a waste heat inlet pipe 101 and a waste heat outlet pipe 102 provided on the outer wall of the device shell 1, a medium circulation chamber 3 installed on the end flange of the device shell 1, and a heat exchange medium inlet pipe 301 and a heat exchange medium outlet pipe 302 provided on the outer wall of the medium circulation chamber 3, a heat exchange pipe 2 provided inside the device shell 1, a baffle plate 5 provided on the inner wall of the device shell 1, and a guide hole 501 opened on the outer wall of the baffle plate 5, and a heat insulation layer 6 provided on the outer wall of the device shell 1.

[0021] like Figures 1-5 As shown, the insulation layer 6 wraps the outer wall of the device shell 1, and the insulation layer 6 is made of rock wool insulation material. The waste heat inlet pipe 101 is located at the bottom of the device shell 1 away from the medium circulation chamber 3, and the waste heat outlet pipe 102 is located at the top of the device shell 1 close to the medium circulation chamber 3. The bottom of the device shell 1 is provided with a drain pipe 4 for condensate discharge, and the outer wall of the drain pipe 4 is provided with a valve 401.

[0022] like Figure 3 and Figure 5 As shown, the heat exchange tube 2 is U-shaped and is set at equal angles. The end of the heat exchange tube 2 is connected to the medium circulation chamber 3. The outer wall of the heat exchange tube 2 and the inner wall of the device housing 1 are coated with a corrosion-resistant layer 7. The outer wall of the heat exchange tube 2 is provided with a turbulence flange 201, which is spirally wound around the outer wall of the heat exchange tube 2. The outer wall of the turbulence flange 201 is arc-shaped.

[0023] like Figure 3 and Figure 4 As shown, the baffle plate 5 is designed in a spiral shape and extends axially along the inner wall of the device housing 1. The baffle plate 5 is fixedly connected to the heat exchange tube 2. The spiral direction of the baffle plate 5 is opposite to the spiral direction of the baffle flange 201. The bottom of the baffle plate 5 has a notch for condensate to flow through. The guide hole 501 penetrates the surface of the baffle plate 5 and the guide hole 501 is distributed in an array.

[0024] When the waste heat recovery device is working, the high-temperature waste heat medium generated by petrochemical production first enters the interior of the device shell 1 through the waste heat inlet pipe 101. Since the waste heat inlet pipe 101 is located at the bottom of the shell at the end away from the medium circulation chamber 3, and the inner wall of the shell is provided with a spiral baffle 5 extending axially, the waste heat medium flows spirally along the inner wall of the shell under the guidance of the baffle 5, which prolongs the residence time in the shell. At the same time, the spiral baffle flange 201 on the outer wall of the heat exchange tube 2 is opposite to the spiral direction of the baffle 5, which destroys the medium boundary layer on the surface of the heat exchange tube 2, reduces thermal resistance and increases the contact area between the medium and the heat exchange tube 2. The array of guide holes 501 on the baffle 5 further ensures the uniformity of medium flow, so that the heat of the waste heat medium can be efficiently transferred to the heat exchange medium inside the heat exchange tube 2. The heat exchange medium enters the medium circulation chamber 3 through the heat exchange medium inlet pipe 301, and then flows to multiple U-shaped heat exchange tubes 2 connected to the medium circulation chamber 3. During the flow in the heat exchange tubes 2, it absorbs the heat transferred by the waste heat medium. The heated heat exchange medium gathers back into the medium circulation chamber 3 and is finally discharged from the heat exchange medium outlet pipe 302, realizing the recovery and utilization of waste heat. The condensate generated during the heat exchange process can flow to the bottom of the shell through the notch at the bottom of the baffle 5, and then be discharged through the drain pipe 4 with valve 401, avoiding water accumulation and corrosion of the shell and internal components. At the same time, the rock wool insulation layer 6 on the outer wall of the shell 1 can effectively reduce the heat loss from the shell to the outside, reducing heat loss, while the corrosion-resistant layer 7 on the inner wall of the heat exchange tubes 2 and the shell ensures the stable operation of the device under the corrosive conditions of petrochemicals.

[0025] Example 2: Please refer to Figures 1-7 Based on Embodiment 1, a filtration mechanism is also disclosed, the specific structure of which is as follows: A filtration mechanism for filtering waste heat is provided at the end of the waste heat inlet pipe 101. The filtration mechanism includes a filter box 8 fixedly installed at the end of the waste heat inlet pipe 101, and a connecting pipe 801 is fixedly installed on the outer wall of the filter box 8. The connecting pipe 801 is connected to a heat source. A sealing cover plate 9 is slidably installed on the outer wall of the filter box 8, and a first filter plate 901 and a second filter plate 902 are fixedly installed at the end of the sealing cover plate 9. The filter chamber is internally equipped with a filter cavity, and the two ends of the filter cavity are connected to the waste heat inlet pipe 101 and the connecting pipe 801, respectively. The first filter plate 901 and the second filter plate 902 are located between the waste heat inlet pipe 101 and the connecting pipe 801, and the first filter plate 901 is close to the connecting pipe 801. The filter hole diameter of the first filter plate 901 is larger than that of the second filter plate 902. A sealing ring 903 is provided between the sealing cover plate 9 and the filter box 8. The sealing ring 903 is made of high temperature resistant material. A handle 904 is provided on the outer wall of the sealing cover plate 9.

[0026] When the waste heat recovery device is working, the high-temperature waste heat medium generated by petrochemical production first enters the filter box 8 through the connecting pipe 801 of the filtration mechanism. Inside the filter chamber, large particles of impurities are intercepted by the first filter plate 901, and fine dust is filtered by the second filter plate 902. The purified waste heat medium then enters the device shell 1 through the waste heat inlet pipe 101. This minimizes the probability of impurities adhering to the heat exchange tubes 2 or the inner wall of the shell after entering the device shell 1, preventing the accumulation of dirt that could reduce heat exchange efficiency. For easy maintenance and cleaning, the outer wall of the filter box 8 is fitted with a sliding sealing cover 9, and both the first filter plate 901 and the second filter plate 902 are fixed to the sealing cover. At the end of the cover plate 9, a filter assembly that can be pulled out as a whole is formed. The high-temperature resistant sealing ring 903 set between the sealing cover plate 9 and the filter box 8 can ensure the sealing performance of the filter chamber while adapting to the high-temperature working conditions in petrochemical production and preventing leakage of high-temperature media. When it is necessary to clean the impurities trapped on the filter plate, the staff only needs to pull the entire filter assembly out of the filter box 8 through the handle 904 on the outer wall of the sealing cover plate 9. The first filter plate 901 and the second filter plate 902 can be cleaned or replaced directly without disassembling the waste heat inlet pipe 101 or the device shell 1, which greatly reduces the maintenance difficulty and downtime, and ensures the long-term stable operation of the device.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A waste heat recovery device for petrochemical production, comprising a device shell (1), wherein the outer wall of the device shell (1) is provided with a waste heat inlet pipe (101) and a waste heat outlet pipe (102), characterized in that: The device housing (1) has a medium circulation chamber (3) installed on the end flange, and the outer wall of the medium circulation chamber (3) is provided with a heat exchange medium inlet pipe (301) and a heat exchange medium outlet pipe (302). The device housing (1) is provided with a heat exchange tube (2). The inner wall of the device housing (1) is provided with a baffle plate (5), and the outer wall of the baffle plate (5) is provided with a guide hole (501). The outer wall of the device housing (1) is provided with a heat insulation layer (6). The end of the waste heat inlet pipe (101) is provided with a filter mechanism for filtering waste heat.

2. The waste heat recovery device for petrochemical production according to claim 1, characterized in that: The insulation layer (6) wraps the outer wall of the device housing (1), and the insulation layer (6) is made of rock wool insulation material. The waste heat inlet pipe (101) is located at the bottom of the device housing (1) away from the medium circulation chamber (3), and the waste heat outlet pipe (102) is located at the top of the device housing (1) close to the medium circulation chamber (3). The bottom of the device housing (1) is provided with a drain pipe (4) for condensate discharge, and the outer wall of the drain pipe (4) is provided with a valve (401).

3. The waste heat recovery device for petrochemical production according to claim 1, characterized in that: The heat exchange tube (2) is U-shaped and is set at equal angles. The end of the heat exchange tube (2) is connected to the medium circulation chamber (3). The outer wall of the heat exchange tube (2) and the inner wall of the device housing (1) are both coated with a corrosion-resistant layer (7).

4. A waste heat recovery device for petrochemical production according to claim 1, characterized in that: The heat exchange tube (2) has a turbulence flange (201) on its outer wall, and the turbulence flange (201) is spirally wound around the outer wall of the heat exchange tube (2), and the outer wall of the turbulence flange (201) is designed in an arc shape.

5. A waste heat recovery device for petrochemical production according to claim 1, characterized in that: The baffle plate (5) is designed in a spiral shape and extends axially along the inner wall of the device housing (1). The baffle plate (5) is fixedly connected to the heat exchange tube (2). The spiral direction of the baffle plate (5) is opposite to that of the baffle flange (201). The bottom of the baffle plate (5) is provided with a notch for condensate to flow through. The guide hole (501) penetrates the surface of the baffle plate (5) and the guide hole (501) is distributed in an array.

6. A waste heat recovery device for petrochemical production according to claim 1, characterized in that: The filtration mechanism includes a filter box (8) fixedly installed at the end of the waste heat inlet pipe (101), and a connecting pipe (801) is fixedly installed on the outer wall of the filter box (8), and the connecting pipe (801) is connected to a heat source. A sealing cover plate (9) is slidably installed on the outer wall of the filter box (8), and a first filter plate (901) and a second filter plate (902) are fixedly installed at the end of the sealing cover plate (9).

7. A waste heat recovery device for petrochemical production according to claim 6, characterized in that: The filter box (8) is provided with a filter chamber inside, and the two ends of the filter chamber are connected to the waste heat inlet pipe (101) and the connecting pipe (801) respectively. The first filter plate (901) and the second filter plate (902) are located between the waste heat inlet pipe (101) and the connecting pipe (801), and the first filter plate (901) is close to the connecting pipe (801), and the filter hole diameter of the first filter plate (901) is larger than that of the second filter plate (902).

8. A waste heat recovery device for petrochemical production according to claim 6, characterized in that: A sealing ring (903) is provided between the sealing cover (9) and the filter box (8), and the sealing ring (903) is made of high temperature resistant material. A handle (904) is provided on the outer wall of the sealing cover (9).

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