A heat exchanger device for subcritical water oxidation process

Abstract

The present invention belongs to the technical field of sewage treatment, and in particular, relates to a heat exchanger device for a subcritical water oxidation process. The present invention has the technical effect of heat exchange between cold and hot wastewater and timely discharge of the superheated gas generated in the heat exchange process to reduce the thermal damage of the heat exchange tube through a heat exchange box unit, a venting pipe unit arranged on the heat exchange box unit and used to release the superheated gas to the outside, and a baffle unit arranged in the venting pipe unit and used to switch the venting channel. The present invention has a simple structure and is easy to install. The heat of the superheated treated wastewater is transferred to the wastewater to be heated through heat exchange to recover energy. An eccentric head pipe is arranged so that the superheated gas accumulated in the upper part of the heat exchange box can dissipate the heat energy in time, and the superheated gas is discharged in time through the venting pipe unit arranged at the pipe mouth, and the release of the superheated gas can be controlled by pushing a turntable and the release direction can be controlled by rotation.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a heat exchanger device used in a subcritical water oxidation process. Background Art

[0002] Wastewater treatment is a process of purifying wastewater to meet the water quality requirements for discharge into a water body or reuse. Subcritical water oxidation process is one of the methods of wastewater treatment process. It is to heat the wastewater to 150-320℃ under high pressure, react with oxygen in the air to completely oxidize organic matter into clean H2O, CO2 and N2, S, P, etc. are converted into the highest valence salts for stabilization, and heavy metals are oxidized to a stable solid phase in the ash. Since the process needs to raise the temperature to 150-320℃, a large amount of heat is required, and heat exchangers are needed to recover heat energy. However, due to the complex composition of industrial wastewater, deformation and breakage often occur due to excessive local temperature of the heat exchanger. The main reason for this situation is: due to the effect of gravity, the raw water has gas-liquid stratification in the heat exchanger, the gas accumulates in the upper part of the heat exchanger, and the liquid accumulates in the lower part. Since the specific heat of gas is much smaller than that of water, the gas phase temperature rises sharply during the reaction, causing local high temperature and high pressure, which damages the heat exchanger. Therefore, the market is in urgent need of a heat exchanger that can discharge superheated gas in time to reduce thermal damage to the heat exchange tubes.

[0003] A Chinese invention patent with publication number CN113195995A and publication date 2020.06.25 discloses a tangled coil heat exchanger, comprising a heat exchanger consisting of multiple tubular fluid channels, wherein the tubular fluid channels are formed into tangled coils (such as spiral coils), wherein the central paths of each coil are remote and form a spiral, and unlike the prior art in which no coils or only some coils are entangled, this structural arrangement maximizes the interweaving of the coils by entangled each coil with each of the other coils, thereby making the number of overlaps represented by the plane of the coil windings the same along the length of the coil.

[0004] Although the invention achieves good heat exchange function by increasing the heat exchange area through spiral tubes, the invention does not have a venting device for discharging overheated gas, and there are problems of local overheating and equipment deformation and cracking caused by slow heat diffusion. Summary of the invention

[0005] The purpose of the present invention is to provide a heat exchanger device for a subcritical water oxidation process. The present invention has the technical effect of exchanging heat between cold and hot wastewater and timely discharging the superheated gas generated in the heat exchange process to reduce the heat damage of the heat exchange tube through a heat exchange box unit, a venting pipe unit arranged on the heat exchange box unit and used to release the superheated gas to the outside, and a baffle unit arranged in the venting pipe unit and used to open and close the venting channel. The present invention has the advantages of simple structure, convenient installation, transferring the heat of the superheated treated wastewater to the wastewater to be heated through heat exchange to achieve energy recovery, setting an eccentric head pipe so that the superheated gas accumulated in the upper part of the heat exchange box can dissipate the heat energy in time, and timely discharging the superheated gas through the venting pipe unit arranged at the pipe mouth, and controlling the release of the superheated gas by pushing a turntable and rotating to control the release direction.

[0006] The technical solution adopted by the present invention to solve the above-mentioned problem is: a heat exchanger device for a subcritical water oxidation process, comprising a heat exchange box unit, a venting pipe unit arranged on the heat exchange box unit and used for releasing superheated gas to the outside, and a baffle unit arranged in the venting pipe unit and used for opening and closing the venting channel.

[0007] A further preferred technical solution is that the heat exchange box unit includes a cylinder, a shell-side inlet pipe and a shell-side outlet pipe arranged on the cylinder, a tube-side inlet pipe and a tube-side outlet pipe arranged on the cylinder, and a heat pipe arranged on the cylinder and used to connect the tube-side inlet pipe and the tube-side outlet pipe.

[0008] A further preferred technical solution is that the heat exchange box unit also includes an eccentric end tube arranged between the cylinder and the tube-side inlet tube, and between the cylinder and the tube-side outlet tube.

[0009] A further preferred technical solution is that: the heat exchanger box unit also includes an exhaust hole arranged on the eccentric head pipe and used to connect the bleed pipe unit; the bleed pipe unit includes a bleed pipe; the baffle unit includes a fixed orifice plate arranged on the inner side surface of the bleed pipe, and a movable orifice plate arranged on the inner side surface of the bleed pipe and located on the top surface of the fixed orifice plate, an air guide plate arranged on the inner side surface of the bleed pipe and located above the movable orifice plate, and a turntable portion arranged on the bleed pipe and connected to the movable orifice plate and the air guide plate.

[0010] A further preferred technical solution is that: the bleed pipe unit also includes a cavity arranged in the bleed pipe, a turntable shaft hole and the movable orifice plate column hole arranged on the bleed pipe and connected to the cavity; the baffle unit also includes an movable orifice plate column arranged on the movable orifice plate and installed on the movable orifice plate column hole; the turntable part includes a turntable, a turntable shaft arranged on the turntable and installed in the turntable shaft hole, a rotating column arranged on the turntable shaft, and a pushing column arranged on the rotating column and connected to the movable orifice plate column.

[0011] A further preferred technical solution is that: the vent pipe unit also includes an air guide plate column hole arranged on the vent pipe and connected to the cavity; the baffle unit also includes an air guide plate column arranged on the air guide plate and installed in the air guide plate column hole and connected to the rotating column.

[0012] A further preferred technical solution is that the turntable portion also includes a first crown gear arranged on the rotating column and meshing with the air guide plate column; the baffle unit also includes a second crown gear arranged on the air guide plate column and used to mesh with the first crown gear.

[0013] A further preferred technical solution is that the turntable portion further includes a semi-arc groove provided on the rotating column, and a limit block provided on the pushing column and engaged in the semi-arc groove.

[0014] A further preferred technical solution is that the turntable portion also includes a rotating gear arranged on the pushing column, a rack arranged on the inner bottom surface of the cavity and meshing with the rotating gear, and a tension spring arranged on the pushing column and connected to the inner side surface of the cavity.

[0015] A further preferred technical solution is that the bleed pipe unit also includes a fixed groove and a T-shaped groove arranged on the bleed pipe; the baffle unit also includes a fixed column arranged on the air guide plate and installed in the fixed groove, and a T-shaped plate arranged on the movable orifice plate and installed in the T-shaped groove.

[0016] The present invention achieves the technical effect of heat exchange between cold and hot wastewater and timely discharge of the superheated gas generated in the heat exchange process to reduce heat damage to the heat exchange tube through a heat exchange box unit, a venting pipe unit arranged on the heat exchange box unit and used to release the superheated gas to the outside, and a baffle unit arranged in the venting pipe unit and used to open and close the venting channel. The present invention has the advantages of simple structure, convenient installation, energy recovery by transferring the heat of the superheated treated wastewater to the wastewater to be heated through heat exchange, arranging an eccentric head pipe so that the superheated gas accumulated in the upper part of the heat exchange box can dissipate the heat energy in time, and timely discharge of the superheated gas through the venting pipe unit arranged at the pipe mouth, and the release of the superheated gas can be controlled by pushing a turntable and the release direction can be controlled by rotation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the heat exchanger device in the present invention.

[0018] Figure 2 It is a structural schematic diagram of the installation method of the vent pipe unit and the baffle unit in the present invention.

[0019] Figure 3 It is a structural schematic diagram of the turntable part in the present invention.

[0020] Figure 4 It is a structural schematic diagram of a method for fixing an air guide plate, a fixed orifice plate and a movable orifice plate on the inner side of the air vent pipe in the present invention. DETAILED DESCRIPTION

[0021] The following descriptions are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention.

[0022] Example: As attached Figure 1 , 2 , 3 and attached Figure 4 As shown, a heat exchanger device for a subcritical water oxidation process includes a heat exchange box unit 1, a venting pipe unit 2 arranged on the heat exchange box unit 1 and used for releasing superheated gas to the outside, and a baffle unit 3 arranged in the venting pipe unit 2 and used for opening and closing the venting channel.

[0023] In this embodiment, the heat exchange box unit 1 constitutes the main body of the heat exchanger device, which includes two parts. The first part is used for superheated treated wastewater through the subcritical water oxidation process, and the second part is used for passing the wastewater to be heated. The two parts have no liquid exchange channels except the heat exchange channel. The technical effect of energy recovery is achieved by transferring the heat of the superheated treated wastewater to the wastewater to be heated through heat exchange.

[0024] In addition, the difference between the heat exchange box unit 1 and the traditional fixed tube plate single-pass heat exchanger is that the wastewater inlet after superheat treatment of the heat exchange box unit 1 is a conical head. Since the liquid always fills the lower part and the gas is in the upper part when the gas and liquid phases flow together, the gas dividing line is the lowest point of the pipe mouth. A conical head is used and the water inlet is set at the highest point of the heat exchanger. Then, the volume occupied by the superheated gas in the heat exchanger is only the height of the pipe inlet and outlet pipes. In this way, the superheated gas can be discharged in time through the vent pipe unit 2 set at the pipe mouth, which is not easy to cause heat accumulation. Moreover, since the liquid basically fills the entire heat exchanger, the local over-temperature area is very small, which effectively protects the heat exchanger.

[0025] In addition, the baffle unit 3 for switching is provided in the vent pipe unit 2, and the baffle unit 3 consists of three parts. The first part is an air baffle for opening and closing the gas channel, the second part is a guide plate for blocking the superheated gas jet and changing the direction of the gas flow, and the third part is a turntable for simultaneously controlling the opening and closing of the air baffle and the angle of the guide plate.

[0026] The heat exchange box unit 1 includes a cylinder 101, a shell-side inlet pipe 102 and a shell-side outlet pipe 103 arranged on the cylinder 101 and used for the inlet and outlet of treated hot wastewater, a tube-side inlet pipe 104 and a tube-side outlet pipe 105 arranged on the cylinder 101 and used for the inlet and outlet of untreated cold wastewater, and a heat pipe 106 arranged on the cylinder 101 and used to connect the tube-side inlet pipe 104 and the tube-side outlet pipe 105.

[0027] In this embodiment, the treated hot wastewater flows into the cylinder 101 from the shell side inlet pipe 102 and flows out of the cylinder 101 through the shell side outlet pipe 103. The tube side inlet pipe 104 and the tube side outlet pipe 105 are arranged on the left and right sides of the cylinder 101. The untreated cold wastewater enters the heat exchange device from the tube side inlet pipe 104, flows through the cylinder 101 through a plurality of heat pipes 106 arranged from top to bottom across the cylinder 101, and exchanges heat with the treated hot wastewater in the cylinder 101, and then flows out from the tube side outlet pipe 105.

[0028] The heat exchange box unit 1 further includes an eccentric end pipe 107 disposed between the cylinder 101 and the tube-side inlet pipe 104 , and between the cylinder 101 and the tube-side outlet pipe 105 .

[0029] In this embodiment, the eccentric end cap tube 107 is in the shape of a half funnel, and there is a certain angle between its lower slope and upper top surface, which is 30° under preferred conditions. When the unheated cold wastewater is heated by heat transfer and the gas-liquid two-phase flows together, the liquid always fills the lower part and the gas is in the upper part. The gas dividing line is the lowest point of the pipe mouth. After the eccentric end cap tube 107 is arranged between the cylinder 101 and the tube side inlet pipe 104, and between the cylinder 101 and the tube side outlet pipe 105, and the tube mouth of the tube side inlet pipe 104 is located at the highest point of the eccentric end cap tube 107, the volume occupied by the gas in the heat exchanger is only the height of the tube side inlet pipe 104 and the tube side outlet pipe 105. In this way, the gas flow rate is large, the heat can be dissipated in time, and it is not easy to cause heat accumulation. Moreover, since the liquid basically fills the entire heat exchanger, the local over-temperature area is very small, which effectively protects the entire heat exchanger.

[0030] The heat exchange box unit 1 also includes an exhaust hole 108 arranged on the eccentric head pipe 107 and used to connect the vent pipe unit 2; the vent pipe unit 2 includes a vent pipe 201; the baffle unit 3 includes a fixed orifice plate 301 arranged on the inner side of the vent pipe 201, and a movable orifice plate 302 arranged on the inner side of the vent pipe 201 and located on the top surface of the fixed orifice plate 301, an air guide plate 303 arranged on the inner side of the vent pipe 201 and located above the movable orifice plate 302, and a turntable portion 304 arranged on the vent pipe 201 and connected to the movable orifice plate 302 and the air guide plate 303.

[0031] In this embodiment, when cold wastewater passes through the heat pipe 106 for heat exchange, a large amount of water vapor will be generated, and the water vapor will cause thermal damage to the top surface of the eccentric end cap tube 107 located between the cylinder 101 and the tube outlet pipe 105. Therefore, an exhaust hole 108 is provided on the eccentric end cap tube 107, and a vent pipe unit 2 and a baffle unit 3 with an opening and closing function are provided on the exhaust hole 108 to achieve the technical purpose of adjusting the steam volume of the eccentric end cap tube 107.

[0032] In addition, the holes between the fixed orifice plate 301 and the movable orifice plate 302 are staggered in a normal state to achieve an airtight function. When the movable orifice plate 302 is translated to align with the holes of the fixed orifice plate 301, a ventilation function is achieved. The air guide plate 303 is arranged above the movable orifice plate 302 and the fixed orifice plate 301 to prevent the danger of hot steam splashing and to adjust the spray direction of the hot steam at any time.

[0033] In addition, the turntable portion 304 is connected with the movable orifice plate 302 and the air guide plate 303 through a series of mechanical structures, so as to control the movement of the movable orifice plate 302 and the air guide plate 303 .

[0034] The vent pipe unit 2 also includes a cavity 202 arranged in the vent pipe 201, a turntable shaft hole 203 and the movable orifice plate column hole 204 arranged on the vent pipe 201 and connected to the cavity 202; the baffle unit 3 also includes an movable orifice plate column 305 arranged on the movable orifice plate 302 and installed on the movable orifice plate column hole 204; the turntable part 304 includes a turntable 304a, a turntable shaft 304b arranged on the turntable 304a and installed in the turntable shaft hole 203, a rotating column 304c arranged on the turntable shaft 304b, and a pushing column 304d arranged on the rotating column 304c and connected to the movable orifice plate column 305.

[0035] In this embodiment, when the turntable 304a is pushed into the cavity 202, the rotating column 304c drives the pushing column 304d to push the movable orifice plate column 305 out of the cavity 202, so that the hole on the movable orifice plate 302 is aligned with the fixed orifice plate 301, thereby achieving the effect of deflation.

[0036] The venting pipe unit 2 also includes an air guide plate column hole 205 arranged on the venting pipe 201 and connected to the cavity 202; the baffle unit 3 also includes an air guide plate column 306 arranged on the air guide plate 303 and installed in the air guide plate column hole 205 and connected to the rotating column 304c.

[0037] In this embodiment, when the turntable 304a is pushed into the cavity 202 and the hole on the movable orifice plate 302 is aligned with the fixed orifice plate 301, the rotating column 304c is just connected to the air guide plate column 306. When the turntable 304a is rotated, the rotating column 304c can drive the air guide plate 303 to rotate through the air guide plate column 306 to adjust the inclination angle of the air guide plate 303.

[0038] The turntable portion 304 further includes a first crown gear 304e disposed on the rotating column 304c and meshed with the air guide plate column 306; the baffle unit 3 further includes a second crown gear 307 disposed on the air guide plate column 306 and used to mesh with the first crown gear 304e.

[0039] In this embodiment, when the rotating column 304c is just connected to the air guide plate column 306, the first crown gear 304e and the second crown gear 307 are meshed together. Therefore, when the turntable 304a is rotated, the rotating column 304c can drive the air guide plate 303 to rotate through the air guide plate column 306 to adjust the inclination angle of the air guide plate 303.

[0040] The turntable portion 304 further includes a semi-arc groove 304f disposed on the rotating column 304c, and a limiting block 304g disposed on the pushing column 304d and engaged in the semi-arc groove 304f.

[0041] In this embodiment, if the pushing column 304d is directly connected to the rotating column 304c, it will affect the rotation process of the rotating column 304c. In order to enable the rotating column 304c to both rotate and drive the pushing column 304d to move left and right, the semi-arc groove 304f is provided on the rotating column 304c and is engaged with the limit block 304g provided on the pushing column 304d, so as to achieve the above technical purpose.

[0042] In addition, the semi-arc groove 304f is an arc of 180°, which also limits the rotation angle of the air guide plate 303 to between 90° and -90°.

[0043] The turntable portion 304 also includes a rotating gear 304h arranged on the pushing column 304d, a rack 304i arranged on the inner bottom surface of the cavity 202 and meshing with the rotating gear 304h, and a tension spring 304j arranged on the pushing column 304d and connected to the inner side surface of the cavity 202.

[0044] In this embodiment, the pushing column 304d is not directly connected to the rotating column 304c, so the limit block 304g is at risk of detaching from the semi-arc groove 304f. In order to further fix the pushing column 304d, the rotating gear 304h is rotatably provided at the lower end of the pushing column 304d and can roll back and forth on the rack 304i, thereby supporting the pushing column 304d from below and preventing the limit block 304g from detaching from the semi-arc groove 304f.

[0045] In addition, the tension spring 304j is arranged on the side opposite to the movable orifice plate column 305, so that under the traction of the tension spring 304j, the air holes of the fixed orifice plate 301 and the movable orifice plate 302 are in a staggered state, that is, a closed state, when not subject to external force, and will only be aligned when the turntable 304a is pushed, and become a ventilation state.

[0046] The vent pipe unit 2 also includes a fixing groove 206 and a T-shaped groove 207 arranged on the vent pipe 201; the baffle unit 3 also includes a fixing column 308 arranged on the air guide plate 303 and installed in the fixing groove 206, and a T-shaped plate 309 arranged on the movable orifice plate 302 and installed in the T-shaped groove 207.

[0047] In this embodiment, the air guide plate 303 is fixed by the air guide plate column 306 only on one side, and the force is uneven, so the fixing column 308 is set on the other side and is engaged in the fixing groove 206 and can rotate freely, so that the air guide plate 303 is supported upward and remains stable.

[0048] In addition, since the movable orifice plate 302 is subjected to the impact of water vapor, good air tightness cannot be guaranteed if it is fixed only by the movable orifice plate column 305. Therefore, the T-shaped plate 309 is provided on the other side of the movable orifice plate 302 and is engaged in the T-shaped slot 207, so that the movable orifice plate 302 and the fixed orifice plate 301 are tightly fitted together to ensure air tightness, and the T-shaped plate 309 can hook the T-shaped slot 207 internally, so that when the movable orifice plate 302 moves left and right, the T-shaped plate 309 will not be separated from the T-shaped slot 207.

[0049] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various modifications can be made within the knowledge of ordinary technicians in the technical field without departing from the purpose of the present invention. These are all non-creative modifications and are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A heat exchanger device for a subcritical water oxidation process, characterized in that: The invention comprises a heat exchange box unit (1), a venting pipe unit (2) arranged on the heat exchange box unit (1) and used for releasing superheated gas to the outside, and a baffle unit (3) arranged in the venting pipe unit (2) and used for opening and closing the venting channel; the heat exchange box unit (1) comprises a cylinder (101), a shell-side inlet pipe (102) and a shell-side outlet pipe (103) arranged on the cylinder (101), a tube-side inlet pipe (104) and a tube-side outlet pipe (105) arranged on the cylinder (101), and a heat pipe (106) arranged on the cylinder (101) and used for connecting the tube-side inlet pipe (104) and the tube-side outlet pipe (105); the heat exchange box unit (1) further comprises an eccentric end pipe (107) arranged between the cylinder (101) and the tube-side inlet pipe (104), and between the cylinder (101) and the tube-side outlet pipe (105).

2. A heat exchanger device for subcritical water oxidation process according to claim 1, characterized in that: The heat exchange box unit (1) further comprises an exhaust hole (108) arranged on the eccentric end cap tube (107) and used for connecting to the exhaust pipe unit (2); the exhaust pipe unit (2) comprises an exhaust pipe (201); the baffle unit (3) comprises a fixed orifice plate (301) arranged on the inner side surface of the exhaust pipe (201), a movable orifice plate (302) arranged on the inner side surface of the exhaust pipe (201) and located on the top surface of the fixed orifice plate (301), an air guide plate (303) arranged on the inner side surface of the exhaust pipe (201) and located above the movable orifice plate (302), and a rotating disk portion (304) arranged on the exhaust pipe (201) and connected to the movable orifice plate (302) and the air guide plate (303).

3. A heat exchanger device for subcritical water oxidation process according to claim 2, characterized in that: The venting pipe unit (2) further comprises a cavity (202) arranged in the venting pipe (201), a turntable shaft hole (203) and a movable orifice plate column hole (204) arranged on the venting pipe (201) and communicating with the cavity (202); the baffle unit (3) further comprises an movable orifice plate column (305) arranged on the movable orifice plate (302) and mounted on the movable orifice plate column hole (204); the turntable portion (304) comprises a turntable (304a), a turntable shaft (304b) arranged on the turntable (304a) and mounted in the turntable shaft hole (203), a rotating column (304c) arranged on the turntable shaft (304b), and a pushing column (304d) arranged on the rotating column (304c) and connected to the movable orifice plate column (305).

4. A heat exchanger device for subcritical water oxidation process according to claim 3, characterized in that: The air release pipe unit (2) further comprises an air guide plate column hole (205) arranged on the air release pipe (201) and communicating with the cavity (202); the baffle unit (3) further comprises an air guide plate column (306) arranged on the air guide plate (303), installed in the air guide plate column hole (205) and connected to the rotating column (304c).

5. A heat exchanger device for subcritical water oxidation process according to claim 4, characterized in that: The turntable portion (304) further comprises a first crown gear (304e) arranged on the rotating column (304c) and meshing with the air guide plate column (306); the baffle unit (3) further comprises a second crown gear (307) arranged on the air guide plate column (306) and used to mesh with the first crown gear (304e).

6. A heat exchanger device for subcritical water oxidation process according to claim 3, characterized in that: The turntable portion (304) further comprises a semi-arc groove (304f) arranged on the rotating column (304c), and a limit block (304g) arranged on the pushing column (304d) and engaged in the semi-arc groove (304f).

7. A heat exchanger device for subcritical water oxidation process according to claim 3, characterized in that: The turntable portion (304) further includes a rotating gear (304h) arranged on the pushing column (304d), a rack (304i) arranged on the inner bottom surface of the cavity (202) and meshing with the rotating gear (304h), and a tension spring (304j) arranged on the pushing column (304d) and connected to the inner side surface of the cavity (202).

8. A heat exchanger device for subcritical water oxidation process according to claim 2, characterized in that: The venting pipe unit (2) further comprises a fixing groove (206) and a T-shaped groove (207) arranged on the venting pipe (201); the baffle unit (3) further comprises a fixing column (308) arranged on the air guide plate (303) and installed in the fixing groove (206), and a T-shaped plate (309) arranged on the movable orifice plate (302) and installed in the T-shaped groove (207).

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