A tee bend horizontal heat exchanger and an oxidation treatment system for organic wastewater

Abstract

The utility model discloses a tee horizontal heat exchanger, the lower end of the shell of heat exchanger is equipped with the refrigerant import, the upper end of shell is equipped with the refrigerant export, the horizontal first baffle is fixed in the shell, and the inner chamber of shell is divided into second heat exchange cavity and first heat exchange cavity that one end communicates from top to bottom, a plurality of first heat exchange pipes are equipped in first heat exchange cavity, and first heat exchange pipe is passed in and has first heat exchange medium, a plurality of second heat exchange pipes are equipped in second heat exchange cavity, and second heat exchange pipe is passed in and has second heat exchange medium. The medium step utilization is realized with double heat exchange pipe group, and different medium does not interfere with each other, and the heat transfer efficiency is effectively promoted. An organic wastewater oxidation treatment system applies the above tee horizontal heat exchanger.

Description

Technical Field

[0001] This utility model relates to the field of heat exchange equipment and wastewater treatment technology, and in particular to a three-way horizontal heat exchanger and an oxidation treatment system for organic wastewater. Background Technology

[0002] As a traditional heat exchange device, the working principle of a tubular heat exchanger is to achieve heat transfer between two fluids through the tube wall. One fluid flows inside the tube (tube side), and the other fluid flows outside the tube (shell side), exchanging heat through the tube wall. In a typical application, taking the cooling process as an example, the high-temperature fluid flows in the shell side, and the cooling medium flows in the tube side, with heat exchange completed through the tube wall.

[0003] Although tubular heat exchangers are widely used, they have obvious technical limitations: First, their heat transfer area per unit volume is small, resulting in low overall heat transfer efficiency; second, a large equipment volume is required to achieve the desired heat transfer, resulting in high material consumption; and third, the heat exchange tubes are prone to vibration during fluid flow, posing a risk of fatigue fracture.

[0004] In the field of organic wastewater treatment, traditional oxidation systems typically employ simple gas-liquid separation devices, capable of handling only small amounts of low-boiling-point organic gases. For example, Chinese Utility Model Patent CN219752096 U discloses an oxidation system for organic wastewater. With increasingly stringent environmental regulations, the amount of gas generated during wastewater treatment has significantly increased. In particular, the oxidation and decomposition of high-concentration wastewater produces large amounts of CO2 gas. If this gas is discharged with the wastewater, it generates substantial foam, affecting the operation of subsequent equipment and posing safety hazards. Furthermore, the system suffers from low heat recovery rates, resulting in energy waste. Moreover, the use of heat exchangers to preheat the organic wastewater containing oxidants in these oxidation systems also presents the same problems.

[0005] To address the aforementioned issues, existing technologies urgently need improvement. Summary of the Invention

[0006] The technical problem to be solved by this utility model is to provide a three-way horizontal heat exchanger and an oxidation treatment system for organic wastewater using the three-way horizontal heat exchanger. The three-way horizontal heat exchanger has the advantage of high heat transfer efficiency.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: A three-way horizontal heat exchanger, comprising: The shell has a first tube box and a second tube box fixed at both ends of the shell, and tube sheets are fixed at both ends of the shell inside the first tube box and the second tube box. The lower end of the housing is provided with a refrigerant inlet, and the upper end of the housing is provided with a refrigerant outlet; The first tube box is provided with a horizontal first partition, which divides the inner cavity of the first tube box into an independent first upper cavity and a first lower cavity from top to bottom; The second tube box is provided with a second partition and a third partition arranged horizontally and vertically at intervals, which divide the inner cavity of the second tube box into an independent second upper cavity, a second middle cavity and a second lower cavity from top to bottom; A horizontal first baffle is fixed inside the shell, which divides the inner cavity of the shell into a second heat exchange chamber and a first heat exchange chamber from top to bottom. The second heat exchange chamber and the first heat exchange chamber are connected at one end. The first heat exchange chamber is provided with multiple first heat exchange tubes. The two ends of the first heat exchange tubes are respectively connected to the first lower cavity and the second lower cavity. The first lower cavity and the second lower cavity are respectively provided with a first heating medium outlet and a first heating medium inlet. The second heat exchange chamber is provided with multiple second heat exchange tubes. The two ends of the second heat exchange tubes are respectively connected to the second middle cavity and the second upper cavity. The second upper cavity and the second middle cavity are respectively provided with a second heating medium inlet and a second heating medium outlet.

[0008] A further technical solution is that a horizontal second baffle is provided inside the second heat exchange chamber, and one end of the second baffle has a second notch for the flow of liquids above and below. The first baffle plate has a first notch for connecting the second heat exchange chamber and one end of the first heat exchange chamber; The refrigerant inlet, first gap, second gap, and refrigerant outlet are arranged alternately on the left and right sides.

[0009] A further technical solution is that the first heat exchange tube and / or the second heat exchange tube are spiral tubes.

[0010] A further technical solution is that the first heating medium is a gas; The second heating medium is a liquid, the second middle cavity is provided with a second heating medium outlet, and the second upper cavity is provided with a second heating medium inlet.

[0011] An oxidation treatment system for organic wastewater includes a conditioning tank, a preheating heat exchanger, a first gas-liquid separator, a heating heat exchanger, and a reaction tank connected in sequence, wherein the preheating heat exchanger is a three-way horizontal heat exchanger as described above.

[0012] A further technical solution includes a second gas-liquid separator, which is connected to the rear of the reaction vessel.

[0013] A further technical solution is that the mixed gas discharged from the first gas-liquid separator and / or the second gas-liquid separator enters the three-way horizontal heat exchanger as the first heating medium. The wastewater discharged after the reaction in the second gas-liquid separator is completed enters the three-way horizontal heat exchanger as the second heating medium.

[0014] A further technical solution is that the first gas-liquid separator and / or the second gas-liquid separator includes: The tank has an exhaust port at the top, a water outlet at the bottom, and a water inlet on the side wall. A central cylinder is fixed in the middle of the inner cavity of the tank, and the central cylinder is arranged coaxially with the tank body; A guide vane, spirally surrounding the outer wall of the central cylinder, is fixed on one side to the inner wall of the tank and on the other side to the outer wall of the central cylinder; and The mist eliminator is fixed to the upper part of the inner cavity of the tank; The water inlet is located above the starting end of the guide plate.

[0015] A further technical solution is that the top of the central cylinder has a radially outwardly extending convex edge.

[0016] A further technical solution is that the top of the reaction vessel is equipped with an exhaust valve with adjustable opening.

[0017] The beneficial effects of adopting the above technical solution are as follows: The three-way horizontal heat exchanger utilizes a multi-stage cavity design to create an orderly flow path. The shell is divided into two heat exchange chambers, one above the other. Each chamber contains an independent heat exchange tube bundle and a different heating medium. Each heating medium flows in parallel within its corresponding heat exchange tube bundle, while the refrigerant flows from bottom to top for heat exchange. Conventional heat exchangers use only a single heat exchange tube bundle; this structure employs dual heat exchange tube bundles to achieve tiered utilization of the medium, ensuring that different media do not interfere with each other. Furthermore, the first baffle plate creates a deflected upward path for the refrigerant within the shell, extending its residence time in the first heat exchange chamber and enabling multi-stage heat recovery, effectively improving heat transfer efficiency. Attached Figure Description

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0019] Figure 1 This is a schematic diagram of the structure of the three-way horizontal heat exchanger of this utility model; Figure 2 This is a schematic diagram of the structure of the organic wastewater oxidation treatment system in this utility model; Figure 3 This is a schematic diagram of the main structure of the first gas-liquid separator and / or the second gas-liquid separator in this utility model; Figure 4 This is a top view of the structure of the first gas-liquid separator and / or the second gas-liquid separator in this utility model.

[0020] In the figure: 101-shell, 102-first tube box, 103-second tube box, 104-first baffle, 105-second baffle, 106-third baffle, 107-first baffle, 108-first heat exchange tube, 109-second heat exchange tube, 110-second baffle; 1-Refrigerant inlet, 2-Refrigerant outlet, 3-First heating medium inlet, 4-First heating medium outlet, 5-Second heating medium inlet, 6-Second heating medium outlet; 201-Tank body, 202-Central cylinder, 203-Baffle plate, 204-Mist eliminator; 2011 - Exhaust port, 2012 - Water outlet, 2013 - Water inlet; 2021 - Raised edge. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Many specific details are set forth in the following description to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0022] In the description of this utility model, unless otherwise stated, the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0023] Example 1

[0024] like Figure 1As shown, a three-way horizontal heat exchanger is provided, with layered heat exchange zones within the heat exchanger to enable stepped heat exchange between media at different temperature zones. The three-way horizontal heat exchanger includes a shell 101, which is a horizontal structure open at both ends. A first tube box 102 and a second tube box 103 are fixed to both ends of the shell 101, respectively. The shell 101 can be fixedly connected to the first tube box 102 and the second tube box 103 at both ends via flanges, and the three together form the external body of the heat exchanger. Tube sheets are fixed to both ends of the shell 101 within the first tube box 102 and the second tube box 103. Tube sheets are existing technology and will not be described in detail here. The shell 101, the first tube box 102, the second tube box 103, and the tube sheets constitute the supporting part of the heat exchanger, which is the same as in the prior art. The lower end of the housing 101 is provided with a refrigerant inlet 1, and the upper end of the housing 101 is provided with a refrigerant outlet 2. The refrigerant inlet 1 and the refrigerant outlet 2 refer to the opening structures provided on the housing 101 and near the end. Specifically, they can be connected by flanges to guide the refrigerant into or out of the housing 101.

[0025] The first pipe box 102 is provided with a horizontal first partition 104, which divides the inner cavity of the first pipe box 102 into an independent first upper cavity and a first lower cavity from top to bottom. The second pipe box 103 is provided with a horizontally spaced second partition 105 and a third partition 106, which divide the inner cavity of the second pipe box 103 into an independent second upper cavity, a second middle cavity, and a second lower cavity from top to bottom. The first partition 104, the second partition 105, and the third partition 106 are all horizontally installed partition components in the pipe box. Specifically, they can be metal plates welded and fixed to the inner wall of the pipe box, forming multi-level media distribution cavities by dividing the pipe box space, so as to realize the independent circulation of different media.

[0026] A horizontal first baffle plate 107 is fixed inside the housing 101, which divides the inner cavity of the housing 101 from top to bottom into a second heat exchange cavity and a first heat exchange cavity. The second heat exchange cavity and the first heat exchange cavity are connected at one end. The first baffle plate 107 can be fixed to the inner wall of the housing 101 by welding or bolting. Its function is to form heat exchange areas distributed vertically and control the direction of refrigerant flow.

[0027] The first heat exchange chamber is equipped with multiple first heat exchange tubes 108. The two ends of the first heat exchange tubes 108 are connected to the first lower cavity and the second upper cavity, respectively. The first lower cavity and the second lower cavity are respectively provided with a first heating medium outlet 4 and a first heating medium inlet 3. The first heat exchange tubes 108 refer to the tube bundle assembly connecting the first lower cavity and the second lower cavity. Specifically, they can be arranged in the form of straight tubes or spiral tubes to realize the heat transfer of high-temperature medium.

[0028] The second heat exchange chamber is equipped with multiple second heat exchange tubes 109. The two ends of each second heat exchange tube 109 are connected to the second middle cavity and the second upper cavity, respectively. The second upper cavity and the second middle cavity are respectively equipped with a second heating medium inlet 5 and a second heating medium outlet 6. The second heat exchange tube 109 refers to a tube bundle assembly connecting the second middle cavity and the second upper cavity. Specifically, the first upper cavity is equipped with multiple U-shaped connectors. The ends of these connectors are fixed to a tube sheet. A second heat exchange tube 109 connected to the second heating medium inlet 5, a connector, and a second heat exchange tube 109 connected to the second heating medium outlet 6 are sequentially connected to form a U-shaped heat exchange tube, thereby achieving heat transfer of the high-temperature medium.

[0029] In operation, the refrigerant enters the first heat exchange chamber from the refrigerant inlet 1 at the lower end of the shell 101. The first heating medium enters the first heat exchange tube 108 through the first lower chamber, transfers heat to the refrigerant, and then exits from the second lower chamber. The second heating medium (hot water) enters the second heat exchange tube 109 through the second upper chamber, completes a secondary heat exchange with the refrigerant, and then exits from the second upper chamber. After the secondary heat exchange, the refrigerant is heated and discharged from the refrigerant outlet 2 outside the shell 101.

[0030] The three-way horizontal heat exchanger forms an orderly flow path through multi-stage cavity separation. The shell 101 is divided into two heat exchange chambers, one above the other. Each heat exchange chamber contains an independent heat exchange tube bundle and different heating media. Each heating media flows in parallel within its corresponding heat exchange tube bundle, with the refrigerant flowing from bottom to top for heat exchange. Conventional heat exchangers only have a single heat exchange tube bundle; this structure uses dual heat exchange tube bundles to achieve tiered utilization of the media, ensuring that different media do not interfere with each other. Furthermore, the first baffle 107 creates a deflected upward path for the refrigerant within the shell 101, extending the refrigerant's residence time in the first heat exchange chamber and achieving multi-stage heat recovery, effectively improving heat transfer efficiency.

[0031] Through the above technical solutions, the refrigerant forms an up-and-down baffle path within the shell 101, ensuring full contact with the two sets of heat exchange tube bundles and improving heat exchange efficiency. The dual heating medium channels enable tiered energy utilization, reducing heat waste from the high-temperature medium. The independent cavity structure prevents mixing of media at different temperatures, maintaining a stable heat transfer temperature difference. The layered tube box design simplifies the medium distribution process and reduces flow resistance losses. The modular construction of the shell 101 and the tube box facilitates maintenance and cleaning, extending the equipment's service life.

[0032] Example 2

[0033] The second heat exchange chamber of the three-way horizontal heat exchanger is provided with a horizontal second baffle plate 110. The second baffle plate 110 is a horizontal partition component set inside the second heat exchange chamber. Specifically, it can be fixed to the inner wall of the shell 101 by welding or bolting to extend the flow path of the cold coal in the second heat exchange chamber.

[0034] The second baffle 110 has a second notch at one end for vertical liquid flow. The first baffle 107 has a first notch for connecting one end of the second heat exchange chamber and the first heat exchange chamber. Both the first and second notches are used to establish liquid channels between adjacent heat exchange chambers. The refrigerant inlet 1, the first notch, the second notch, and the refrigerant outlet 2 are arranged alternately from left to right, so that the refrigerant forms a serpentine flow path within the shell 101.

[0035] like Figure 1 As shown, after the refrigerant enters the first heat exchange chamber through the refrigerant inlet 1 on the lower left side of the shell 101, it must bypass the first baffle 107 and enter the second heat exchange chamber through the first notch on the right. It is then guided by the second baffle 110 to the second notch on the left and deflected back, finally exiting from the refrigerant outlet 2 on the upper right side of the shell 101. During this flow, the refrigerant sequentially passes through the tube bundle areas of the two heat exchange chambers and undergoes two heat exchanges with the heating medium in the first heat exchange tube 108 and the second heat exchange tube 109. The extension of the flow path is achieved by the alternating left and right arrangement of the refrigerant inlet 1, the first notch, the second notch, and the refrigerant outlet 2, forcing the refrigerant to form an "S"-shaped trajectory within the shell 101. This allows the refrigerant to undergo multiple deflections within a limited space, achieving sufficient disturbance of the refrigerant within the shell 101, resulting in more uniform contact between the refrigerant and the heat exchange tube bundle, and improving the overall heat exchange efficiency. Furthermore, the heat exchange time is extended without increasing the equipment volume. Unlike existing technologies where the refrigerant flows directly upwards, which can easily create dead zones, the staggered notch design of this three-way horizontal heat exchanger effectively avoids liquid stagnation.

[0036] Example 3

[0037] The first heat exchange tube 108 is a spiral tube, extending spirally along the axial direction of the shell 101. The second heat exchange tube 109 can also be a spiral tube, similarly extending spirally along the axial direction of the shell 101.

[0038] The spiral structure extends the fluid flow path within the pipe, increasing the contact time and area with the pipe wall. Furthermore, the spiral shape generates turbulence in the heating medium, enhancing heat transfer between the pipe wall and the refrigerant. By increasing surface area and altering the flow state of the heating medium, the heat exchange tube improves heat transfer efficiency. The spiral structure also reduces the likelihood of scaling inside the pipe, extending equipment maintenance cycles. In addition, the spiral structure disperses vibration energy generated by fluid flow and releases stress caused by pipe expansion and contraction due to temperature changes, reducing the risk of fatigue fracture in the heat exchange tube due to vibration and internal stress variations.

[0039] Example 4

[0040] In a three-way horizontal heat exchanger, the first heating medium introduced into the first heat exchange chamber can be a high-temperature gas; the second heating medium introduced into the second heat exchange chamber can be a high-temperature liquid such as hot water. The second middle chamber is provided with a second heating medium outlet 6, and the second upper chamber is provided with a second heating medium inlet 5.

[0041] As the refrigerant flows sequentially through the first and second heat exchange chambers within the shell 101, it first heats up with high-temperature steam and then exchanges heat with high-temperature hot water. This staged utilization of steam and hot water leverages the high efficiency of steam phase change heat transfer while utilizing the sensible heat of the hot water to maintain continuous heat exchange. The temperature of the introduced high-temperature hot water can be lower than the temperature of the introduced high-temperature steam.

[0042] Example 5

[0043] like Figure 2 As shown, an oxidation treatment system for organic wastewater includes a conditioning tank, a preheating heat exchanger, a first gas-liquid separator, a heating heat exchanger, and a reaction tank connected in sequence.

[0044] The conventional treatment process is as follows: Organic wastewater enters a conditioning tank for acidification and homogenization. Then, it is pumped to a preheating heat exchanger via a feed pump, while hydrogen peroxide is added. After preheating to a set temperature, the wastewater with added oxidant enters the first gas-liquid separator. During its flow within the preheating heat exchanger and the first gas-liquid separator, hydrogen peroxide performs preliminary oxidation on the organic wastewater. Small molecules and low-boiling-point substances generated by the oxidation ring-opening and chain-breaking reactions, along with low-boiling-point pollutants from the raw water, mix with water vapor and are discharged as gas through the exhaust valve at the top of the first gas-liquid separator. The wastewater discharged from the bottom of the first liquid separator is sent to a heating heat exchanger for heating before entering a reaction tank containing a catalyst. Under the action of the catalyst, hydrogen peroxide generates hydroxyl radicals, which fully oxidize high-boiling-point and recalcitrant pollutants in the wastewater, effectively removing COD. Once the COD of the wastewater in the reaction tank meets the standards, it can be discharged. After the reaction is completed, the wastewater discharged enters the preheating heat exchanger to exchange heat with the wastewater to be treated. If needed, the wastewater can then enter the cooling heat exchanger for further cooling before being discharged into the biochemical tank or other biochemical systems for treatment.

[0045] A unique feature of the organic wastewater oxidation treatment system is that the preheating heat exchanger employs any of the three-way horizontal heat exchangers described above. The mixed gas discharged from the first gas-liquid separator mainly consists of water vapor, in addition to CO2, and may also contain a small amount of organic gases. The temperature and pressure inside the reaction tank are high, resulting in a high temperature for the discharged mixed gas, allowing for heat recovery. This heat is then fed into the pre-heat exchanger for further heat recovery. Therefore, the exhaust port 2011 of the first gas-liquid separator is connected to the first heating medium inlet 3, and the mixed gas discharged from the first gas-liquid separator serves as the first heating medium entering the three-way horizontal heat exchanger. The water outlet port of the reaction tank is connected to the second heating medium inlet 5, and the wastewater discharged after the reaction in the reaction tank serves as the second heating medium entering the three-way horizontal heat exchanger. This allows the wastewater to complete two phase change heat transfers during its flow within the three-way horizontal heat exchanger.

[0046] In this embodiment, only a first gas-liquid separator is set up. The temperature of the first heating medium (high temperature gas) entering is 95~115℃, the temperature of the second heating medium (hot water) entering is 140~155℃, the temperature at refrigerant inlet 1 is 30~40℃, and the temperature at refrigerant outlet 2 is 110~125℃.

[0047] Example 6

[0048] During the oxidation process in the reaction tank, some organic matter in the wastewater is completely oxidized and decomposed, resulting in a significant reduction in COD. However, the oxidation of organic matter also produces CO2 gas; the more COD removed, the greater the CO2 gas production. For some high-concentration wastewater, the removal of a significant amount of COD results in a large volume of gas production. If this gas is discharged along with the wastewater, it will generate a large amount of foam. If the treated wastewater is used directly as the primary heating medium in subsequent heat exchangers without undergoing gas-liquid separation, it will reduce heat exchange efficiency. Furthermore, the foam discharged into subsequent wastewater treatment systems will also affect the normal operation of the systems.

[0049] Therefore, the oxidation treatment system for this organic wastewater also includes a second gas-liquid separator, which is connected to the rear of the reaction tank. By adding a second gas-liquid separator after the reaction tank, the gas generated in the reaction is effectively separated before entering the downstream equipment, avoiding the decrease in heat transfer efficiency caused by foam accumulation and the problems of equipment blockage and vibration.

[0050] Example 7

[0051] The mixed gas discharged from the first and second gas-liquid separators mainly consists of water vapor, in addition to CO2, and may also contain a small amount of organic gases. The temperature and pressure inside the reaction vessel are relatively high, and the temperature of the discharged mixed gas is also relatively high. The heat can be recovered and enters the pre-heat exchanger to recover heat.

[0052] Therefore, the outlet port of the first gas-liquid separator and / or the exhaust port 2011 of the second gas-liquid separator are connected to the inlet 3 of the first heating medium, and the mixed gas discharged from the first gas-liquid separator and / or the second gas-liquid separator enters the three-way horizontal heat exchanger as the first heating medium; the outlet port 2012 of the second gas-liquid separator is connected to the inlet 5 of the second heating medium, and the wastewater discharged after the reaction of the second gas-liquid separator is completed enters the three-way horizontal heat exchanger as the second heating medium.

[0053] In this embodiment, a first gas-liquid separator and a second gas-liquid separator are provided simultaneously. At this time, the temperature of the first heating medium (high temperature gas) entering is 120~135℃, the temperature of the second heating medium (hot water) entering is 140~155℃, the temperature at the refrigerant inlet 1 is 30~40℃, and the temperature at the refrigerant outlet 2 is 115~130℃.

[0054] Example 8

[0055] like Figure 3 and Figure 4 As shown, the first and second gas-liquid separators can adopt the same structure, including a tank 201, a central cylinder 202, a guide plate 203, and a mist eliminator 204. The tank 201 has an exhaust port 2011 at its top, a water outlet 2012 at its bottom, and a water inlet 2013 on its side wall. The central cylinder 202 is fixed to the middle of the inner cavity of the tank 201, and is coaxially arranged with the tank 201. The guide plate 203 spirally surrounds the central cylinder 202. One side of the guide plate 203 is fixed to the inner wall of the tank 201, and the other side is fixed to the outer wall of the central cylinder 202. In the same cross-section, the height of the connection point with the inner wall of the tank 201 is greater than the height of the connection point with the central cylinder 202. The guide plate 203 is arranged spirally downwards inside the tank 201, guiding the incoming water flow to rotate rapidly downwards. The guide plate 203 extends the fluid movement trajectory and enhances the centrifugal separation effect through its spiral path. The mist eliminator 204 is fixed to the upper part of the inner cavity of the tank 201 to intercept droplets entrained in the rising airflow. The water inlet 2013 is located above the starting end of the guide plate 203, that is, the water inlet 2013 is located on the upper surface of the guide plate 203. Water entering through the water inlet 2013 falls on the upper surface of the guide plate 203 and can flow downward spirally along the guide plate 203. The water inlet 2013 enters tangentially to the tank 201, and its rotation direction is the same as the rotation direction of the guide plate 203, further guiding the incoming water flow to rotate rapidly downward.

[0056] The gas-containing liquid, under pressure and with a relatively high flow rate, enters the tank 201 through the inlet 2013 and flows downwards along the spiral channel formed by the guide plate 203. Under centrifugal force, the gas gathers towards the center. The denser liquid, flowing on the guide plate 203, mostly gathers away from the central cylinder 202, while the less dense bubbles gather near the central cylinder 202. Small bubbles coalesce into larger bubbles, which then burst, releasing the gas from the liquid. The separated gas can either spiral upwards or enter the upper space of the separator through the central cylinder 202. Passing through the mist eliminator 204, small droplets collide with the blades, while larger droplets flow downwards under gravity. The central cylinder 202 restricts the gas's diffusion to the surrounding area, causing it to rise axially to the mist eliminator 204 area. Residual droplets are intercepted and fall back to the bottom of the tank. The gas rising through the mist eliminator 204 is discharged through the exhaust port 2011, and the liquid flows out from the bottom outlet 2012.

[0057] The spiral structure of the guide plate 203 extends the fluid path, allowing sufficient time for gas-liquid phase separation. The guide plate 203 forces the fluid into a swirling flow, and combined with the central cylinder 202 constraining the gas flow path, significantly improving gas-liquid separation efficiency. Simultaneously, the mist eliminator 204 further reduces the droplet content in the gas. This effectively solves the problem of reduced efficiency in subsequent equipment due to excessive gas entrainment in the post-reaction mixture, reduces the risk of foam entering the heat exchanger, avoids vibration hazards caused by gas-liquid mixing, and extends system operational stability and equipment lifespan.

[0058] The fog eliminator 204 consists of multiple vertically arranged blades, which are bent into V-shapes, X-shapes, "human" shapes, wavy shapes, etc. The blades are arranged at certain intervals to ensure a certain fog removal effect and low resistance.

[0059] Example 9

[0060] The top of the central cylinder 202 has a radially outwardly extending rim 2021. This rim 2021 forms a blocking surface during the upward movement of the gas-liquid mixture, which on the one hand forces the fluid to change its flow direction and avoids the high-speed airflow from directly impacting the mist eliminator 204; on the other hand, it can reduce the splashing droplets that follow the upward flow of the airflow.

[0061] Example 10

[0062] The top of the reaction vessel is equipped with an adjustable exhaust valve to discharge most of the generated CO2 gas from the reaction vessel. Based on the COD reduction value, the amount of CO2 gas generated can be roughly calculated, and the valve opening can be adjusted accordingly to reduce the impact of exhaust on the pressure of the reaction vessel and maintain the treatment effect.

[0063] Inside the reaction tank, organic wastewater undergoes an oxidation reaction under high temperature and pressure, decomposing organic matter to produce CO2. As the reaction proceeds, the pressure inside the tank gradually increases. At this point, the exhaust valve automatically adjusts its opening according to preset control logic to discharge excess gas. When COD removal increases, leading to a rise in gas production, the exhaust valve opening increases accordingly to maintain stable pressure inside the tank; when gas production decreases, the opening decreases to reduce heat loss. The discharged high-temperature mixed gas can be connected to the front-end heat exchange system for heat recovery, while preventing excess gas from entering subsequent heat exchange equipment and forming foam.

[0064] By dynamically balancing the gas emissions within the reaction vessel, the impact of pressure fluctuations on the stability of the oxidation reaction can be prevented, the weakening effect of foam on the heat transfer efficiency of the heat exchanger can be reduced, and the overall energy consumption of the system can be reduced by recovering exhaust heat, thus extending the equipment's operating cycle.

[0065] The above are merely preferred embodiments of this utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

Claims

1. A three-way horizontal heat exchanger, comprising: The housing (101) has a first tube box (102) and a second tube box (103) fixed at both ends of the housing (101), and tube plates are fixed at both ends of the housing (101) inside the first tube box (102) and the second tube box (103); Its features are: The lower end of the housing (101) is provided with a refrigerant inlet (1), and the upper end of the housing (101) is provided with a refrigerant outlet (2). The first tube box (102) is provided with a horizontal first partition (104) that divides the inner cavity of the first tube box (102) into an independent first upper cavity and a first lower cavity from top to bottom; The second tube box (103) is provided with a second partition (105) and a third partition (106) arranged horizontally and vertically at intervals, which divide the inner cavity of the second tube box (103) into an independent second upper cavity, a second middle cavity and a second lower cavity from top to bottom; A horizontal first baffle plate (107) is fixed inside the housing (101), which divides the inner cavity of the housing (101) from top to bottom into a second heat exchange cavity and a first heat exchange cavity, and the second heat exchange cavity and the first heat exchange cavity are connected at one end; The first heat exchange chamber is provided with multiple first heat exchange tubes (108). The two ends of the first heat exchange tubes (108) are respectively connected to the first lower cavity and the second lower cavity. The first lower cavity and the second lower cavity are respectively provided with a first heating medium outlet (4) and a first heating medium inlet (3). The second heat exchange chamber is provided with multiple second heat exchange tubes (109). The two ends of the second heat exchange tubes (109) are respectively connected to the second middle cavity and the second upper cavity. The second upper cavity and the second middle cavity are respectively provided with a second heating medium inlet (5) and a second heating medium outlet (6).

2. The three-way horizontal heat exchanger according to claim 1, characterized in that, The second heat exchange chamber is provided with a horizontal second baffle (110), and one end of the second baffle (110) has a second notch for the flow of liquids in the upper and lower parts; The first baffle (107) has a first notch for connecting one end of the second heat exchange chamber and the first heat exchange chamber; The refrigerant inlet (1), the first gap, the second gap, and the refrigerant outlet (2) are arranged alternately on the left and right sides.

3. The three-way horizontal heat exchanger according to claim 1, characterized in that, The first heat exchange tube (108) and / or the second heat exchange tube (109) are spiral tubes.

4. The three-way horizontal heat exchanger according to claim 1, characterized in that, The first heating medium is gas; The second heating medium is a liquid, the second middle cavity is provided with a second heating medium outlet (6), and the second upper cavity is provided with a second heating medium inlet (5).

5. An oxidation treatment system for organic wastewater, comprising a conditioning tank, a preheating heat exchanger, a first gas-liquid separator, a heating heat exchanger, and a reaction tank connected in sequence, characterized in that, The preheating heat exchanger is a three-way horizontal heat exchanger as described in any one of claims 1-4.

6. The organic wastewater oxidation treatment system according to claim 5, characterized in that, It also includes a second gas-liquid separator, which is connected to the rear of the reaction vessel.

7. The oxidation treatment system for organic wastewater according to claim 6, characterized in that, The mixed gas discharged from the first gas-liquid separator and / or the second gas-liquid separator enters the three-way horizontal heat exchanger as the first heating medium. The wastewater discharged after the reaction in the second gas-liquid separator is completed enters the three-way horizontal heat exchanger as the second heating medium.

8. The oxidation treatment system for organic wastewater according to claim 6, characterized in that, The first gas-liquid separator and / or the second gas-liquid separator include: The tank (201) has an exhaust port (2011) at the top, a water outlet (2012) at the bottom, and a water inlet (2013) on the side wall. A central cylinder (202) is fixed in the middle of the inner cavity of the tank body (201), and the central cylinder (202) is coaxially arranged with the tank body (201); A guide plate (203) is spirally wrapped around the outside of the central cylinder (202). One side of the guide plate (203) is fixed to the inner wall of the tank (201), and the other side is fixed to the outer wall of the central cylinder (202). The mist eliminator (204) is fixed to the upper part of the inner cavity of the tank (201); The inlet (2013) is located above the starting end of the guide plate (203).

9. The oxidation treatment system for organic wastewater according to claim 8, characterized in that, The top of the central cylinder (202) has a radially outwardly extending flange (2021).

10. The oxidation treatment system for organic wastewater according to claim 5, characterized in that, The top of the reaction vessel is equipped with an adjustable exhaust valve.

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