Energy-saving heat exchange equipment for industrial wastewater discharge

Abstract

The invention discloses energy-saving heat exchange equipment for industrial wastewater discharge, and relates to the technical field of heat exchangers. The equipment comprises a centrifugal pump, a heat exchanger, a control cabinet and a filter box, the cold liquid outlet end of the heat exchanger communicates with a cold liquid discharge pipe, a first temperature sensor for detecting the internal temperature of the cold liquid discharge pipe is arranged on the surface of the cold liquid discharge pipe, and a second temperature sensor is arranged in the filter box; the surface of the cold liquid supply pipe is provided with a flowmeter for detecting the flow speed in the cold liquid supply pipe, the heat exchanger comprises a shell, an end socket and pipe plates, a heat exchange pipe is arranged between the two pipe plates, and the surface of the heat exchange pipe is slidably connected with a first cleaning plate and a second cleaning plate; and a driving structure for driving the first cleaning plate and the second cleaning plate to move in the length direction of the heat exchange pipe is arranged on the surface of the shell. According to the energy-saving heat exchange equipment for industrial wastewater discharge, efficient recovery and reutilization of wastewater heat energy are achieved, and the energy efficiency of industrial production is improved.

Description

Technical Field

[0001] The invention relates to the technical field of heat exchangers, in particular to energy-saving heat exchange equipment for industrial wastewater discharge. Background Art

[0002] Heat exchangers (also known as heat exchangers or heat exchange equipment) are devices used to transfer heat from hot fluid to cold fluid to meet specified process requirements. They are an industrial application of convective heat transfer and heat conduction. In the industrial production process, wastewater discharge not only brings environmental pollution problems, but also wastes a lot of heat energy. Although the heat exchangers in traditional wastewater treatment systems have achieved wastewater heat energy recovery to a certain extent, there are many shortcomings.

[0003] First, the surface of the heat exchange tubes in the existing heat exchangers is scaled due to the deposition and crystallization of impurities and minerals in the wastewater. This not only reduces the heat exchange efficiency, but also requires regular disassembly and cleaning, which increases the equipment maintenance cost. Secondly, the existing heat exchanger cold liquid passes directly through the heat exchanger, which makes it difficult to accurately control the temperature after heat exchange. Too fast a flow rate may cause the fluid to stay in the heat exchange tube for too short a time, resulting in too low a temperature; while too slow a flow rate may cause the fluid to stay in the heat exchange tube for too long, resulting in unnecessary energy loss. Therefore, how to accurately control the flow rate to achieve the best heat exchange effect has become a major challenge facing existing heat exchangers.

[0004] Therefore, designing a heat exchange device that is efficient, energy-saving, easy to maintain and can solve existing problems has become an issue that needs to be urgently addressed. Summary of the invention

[0005] 1. Technical issues to be resolved In view of the deficiencies in the prior art, the present invention provides an energy-saving heat exchange device for industrial wastewater discharge, which solves the problems of low heat exchange efficiency caused by scaling on the surface of heat exchanger tubes and uncontrollable flow rate in traditional wastewater treatment systems, realizes efficient recovery and reuse of wastewater thermal energy, and improves the energy efficiency of industrial production.

[0006] (II) Technical solution To achieve the above objectives, the present invention is implemented through the following technical solutions: an energy-saving heat exchange device for industrial wastewater discharge, comprising a centrifugal pump, a heat exchanger, a control cabinet and a filter box, a cold liquid supply pipe is connected between the outlet end of the centrifugal pump and the cold liquid inlet end of the heat exchanger, a straight pipe is connected to the outlet end of the filter box, a discharge pipe is connected to the hot water outlet end of the heat exchanger, one end of the straight pipe is connected to one side of the discharge pipe, a hot liquid supply pipe is connected to the surface of the straight pipe, the hot liquid supply pipe is connected to the hot water inlet end of the heat exchanger, a first valve body is arranged on the surface of the hot liquid supply pipe, a second valve body is arranged on the surface of the straight pipe and on a side close to the discharge pipe, and a one-way valve is arranged on the surface of the discharge pipe and on a side close to the heat exchanger. A valve, the flow direction of the one-way valve is consistent with the flow direction of the hot water outlet end of the heat exchanger, the cold liquid outlet end of the heat exchanger is connected with a cold liquid discharge pipe, the surface of the cold liquid discharge pipe is provided with a first temperature sensor for detecting the internal temperature of the cold liquid discharge pipe, the filter box is provided with a second temperature sensor, the surface of the cold liquid supply pipe is provided with a flow meter for detecting the flow rate of the liquid in the cold liquid supply pipe, the first temperature sensor and the second temperature sensor transmit the detection results to the control cabinet, the control cabinet controls the speed of the centrifugal pump to adjust the flow rate of the liquid in the cold liquid supply pipe according to the comparison result of the value of the first temperature sensor with the preset value, and the control cabinet controls the start and stop of the centrifugal pump according to the comparison result of the value of the second temperature sensor with the preset value; The heat exchanger includes a shell, a head and a tube sheet, a heat exchange tube is arranged between two of the tube sheets, a first cleaning plate and a second cleaning plate are slidably connected to the surface of the heat exchange tube, a driving structure for driving the first cleaning plate and the second cleaning plate to move along the length direction of the heat exchange tube is arranged on the surface of the shell, and a support seat is fixedly connected to the bottom of the shell.

[0007] Preferably, the head is arranged at both ends of the shell and is sealed and connected to the shell, the tube sheet is fixed on the inner wall of the shell near the two ends, an upper baffle and a lower baffle are arranged in the shell, the upper baffle is fixed on the upper half of the inner wall of the shell, and the lower baffle is fixed on the lower half of the inner wall of the shell, the outer contour of the first cleaning plate is similar to the outer contour of the upper baffle and is arranged on one side of the upper baffle in a corresponding manner, the outer contour of the second cleaning plate is similar to the outer contour of the lower baffle and is arranged on one side of the lower baffle in a corresponding manner, one end of the head is connected to a first connecting pipe, the top of the shell and near both ends are connected to a second connecting pipe, the bottom of the shell is connected to a drain pipe, and a sealing plate is arranged at one end of the drain pipe.

[0008] Preferably, the upper baffle plate and the lower baffle plate are provided in plurality and are staggered at equal intervals, and the spacing between the first cleaning plate and the second cleaning plate is equal to the spacing between the upper baffle plate and the lower baffle plate.

[0009] Preferably, the driving structure includes a fixed cylinder shell, an annular seat, an internal gear ring and a driving motor, the fixed cylinder shell is provided with four and are evenly distributed on the surface of the shell in the circumferential direction, one side of the fixed cylinder shell is connected to the inside of the shell, the annular seat is fixed on the surface of the shell and close to the end position, one side of the internal gear ring is slidably connected to the annular seat, one side of the fixed cylinder shell is fixedly connected to a limited support seat, the other side of the internal gear ring on one side of the limited support seat is slidably connected, the inner wall of the fixed cylinder shell is rotatably connected with a screw rod, one end of the screw rod extends to the outside of the fixed cylinder shell and is fixedly connected with a gear, the gear is meshed with the internal gear ring, the driving motor is fixed to the surface of the support seat on one side, the output shaft end of the driving motor is fixedly connected with a driving gear, the driving gear is meshed with the internal gear ring, the surface of the screw rod is threadedly connected with a moving seat, one side of the moving seat is fixedly connected with a connecting rod, and the connecting rod is fixedly connected to the corresponding first cleaning plate and second cleaning plate.

[0010] Preferably, one end of the filter box is connected to a wastewater inlet pipe, a filter screen is arranged inside the filter box, and the inlet end of the centrifugal pump is connected to a cold liquid inlet pipe.

[0011] Preferably, cleaning blocks for cleaning the surface of the screw rod are fixedly connected to both ends of the movable seat, and the cleaning block extends spirally along the thread direction of the screw rod and has a cutting edge at one end.

[0012] Preferably, the first cleaning plate comprises a plate body, a reinforcement frame is fixedly connected to the edge of the plate body, a cleaning sleeve adapted to the heat exchange tube is arranged on the surface of the plate body, and long holes and reinforcing ribs are also arranged on the surface of the plate body.

[0013] Preferably, one end of the heat exchange tube is fixedly sealed and connected to the corresponding tube sheet, and the other end of the heat exchange tube is slidably sealed and connected to the corresponding tube sheet.

[0014] Preferably, a sealing rubber ring is provided between the surface of the screw rod and the fixed cylinder shell.

[0015] Preferably, the first valve body and the second valve body are electric valves.

[0016] (III) Beneficial effects The present invention provides an energy-saving heat exchange device for industrial wastewater discharge, which has the following beneficial effects: (1) By installing a second temperature sensor in the filter box and a first temperature sensor on the surface of the cold liquid discharge pipe, the second temperature sensor can detect the temperature of the hot liquid, and the first temperature sensor can detect the temperature of the cold liquid after heating. By controlling the speed of the centrifugal pump to adjust the liquid flow rate in the cold liquid supply pipe, the residence time of the cold liquid in the heat exchange tube is adjusted, thereby achieving precise control of the temperature of the cold liquid after heat exchange; (2) The driving structure drives the first cleaning plate and the second cleaning plate to move along the length direction of the heat exchange tube, so that the scaling problem of the heat exchange tube is effectively solved, the heat exchange efficiency is effectively improved, and the equipment maintenance cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the heat exchange device of the present invention; Figure 2 It is a front view of the heat exchanger of the present invention; Figure 3 It is a left side view of the heat exchanger of the present invention; Figure 4 For the present invention Figure 3 Middle AA section view; Figure 5 For the present invention Figure 3 Middle BB section view; Figure 6 For the present invention Figure 2 Middle CC section view; Figure 7 For the present invention Figure 5 Enlarged view of point A in the middle; Figure 8 It is a structural schematic diagram of the first cleaning plate of the present invention; Fig. 9 It is a schematic diagram of the three-dimensional structure of the heat exchanger of the present invention; Fig.10 For the present invention Figure 8 Enlarged view of point B in the middle.

[0018] In the figure: 1-centrifugal pump, 2-heat exchanger, 201-shell, 202-head, 203-first connecting pipe, 204-tube sheet, 205-heat exchange tube, 206-second connecting pipe, 207-upper baffle, 208-lower baffle, 209-first cleaning plate, 2091-plate body, 2092-reinforcement frame, 2093-long hole, 2094-cleaning sleeve, 2095-reinforcement rib, 210-second cleaning plate, 211-support seat, 212-fixed shell, 213-screw, 214-gear, 215-annular seat, 216- Internal gear ring, 217-limit support seat, 218-moving seat, 2181-cleaning block, 219-connecting rod, 220-driving motor, 221-driving gear, 222-drain pipe, 3-control cabinet, 4-filter box, 5-cold liquid supply pipe, 6-straight pipe, 7-discharge pipe, 8-hot liquid supply pipe, 9-first valve body, 10-second valve body, 11-check valve, 12-cold liquid discharge pipe, 13-flow meter, 14-first temperature sensor, 15-second temperature sensor, 16-wastewater inlet pipe, 17-cold liquid inlet pipe, 18-filter. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] See also Figure 1-Figure 10 The present invention provides a technical solution: an energy-saving heat exchange device for industrial wastewater discharge, comprising a centrifugal pump 1, a heat exchanger 2, a control cabinet 3 and a filter box 4, a cold liquid supply pipe 5 is connected between the outlet end of the centrifugal pump 1 and the cold liquid inlet end of the heat exchanger 2, the inlet end of the centrifugal pump 1 is connected with a cold liquid inlet pipe 17, one end of the cold liquid inlet pipe 17 is connected to a container of liquid to be heated, and the liquid is pumped into the heat exchanger 2 through the centrifugal pump 1 for heat exchange, the outlet end of the filter box 4 is connected with a straight pipe 6, one end of the filter box 4 is connected with a wastewater inlet pipe 16, a filter screen 18 is arranged in the filter box 4, one end of the wastewater inlet pipe 16 is connected to the industrial wastewater discharge port, so that the industrial wastewater with heat can enter the heat exchanger 2 through the filter box 4, wherein a plurality of filter screens 18 are arranged to prevent fine particles and debris in the wastewater from entering the heat exchanger 2.

[0021] The hot water outlet end of the heat exchanger 2 is connected with a discharge pipe 7, one end of the straight pipe 6 is connected with one side of the discharge pipe 7, the surface of the straight pipe 6 is connected with a hot liquid supply pipe 8, and the hot liquid supply pipe 8 is connected with the hot water inlet end of the heat exchanger 2, and a first valve body 9 is arranged on the surface of the hot liquid supply pipe 8, and a second valve body 10 is arranged on the surface of the straight pipe 6 and on the side close to the discharge pipe 7, and a one-way valve 11 is arranged on the surface of the discharge pipe 7 and on the side close to the heat exchanger 2. The flow direction of the one-way valve 11 is consistent with the flow direction of the hot water outlet end of the heat exchanger 2. Through the arrangement of the first valve body 9 and the second valve body 10, it is possible to choose to let industrial waste water first enter the heat exchanger 2 and then be discharged through the discharge pipe 7 or be discharged directly from the discharge pipe 7, which facilitates the normal discharge of industrial waste water from the heat exchanger 2 during the cleaning stage. The one-way valve 11 ensures that the industrial waste water will not enter the heat exchanger 2 when it is directly discharged from the discharge pipe 7. When cleaning the heat exchanger 2, the first valve body 9 is closed and the second valve body 10 is opened. During normal heat exchange, the first valve body 9 is opened and the second valve body 10 is closed.

[0022] The cold liquid outlet end of the heat exchanger 2 is connected with a cold liquid discharge pipe 12, and a first temperature sensor 14 for detecting the internal temperature of the cold liquid discharge pipe 12 is arranged on the surface of the cold liquid discharge pipe 12. The temperature of the cold liquid after heat exchange can be measured by the first temperature sensor 14. The filter box 4 is provided with a second temperature sensor 15 for detecting the discharge temperature of industrial waste water. The surface of the cold liquid supply pipe 5 is provided with a flow meter 13 for detecting the flow rate of the liquid in the cold liquid supply pipe 5. The first temperature sensor 14 and the second temperature sensor 15 transmit the detection results to the control cabinet 3. The control cabinet 3 is provided with a temperature comparison module and a PLC controller. The control cabinet 3 controls the speed of the centrifugal pump 1 to adjust the flow rate of the liquid in the cold liquid supply pipe 5 according to the comparison result of the value of the first temperature sensor 14 and the preset value. By adjusting the flow rate of the liquid in the cold liquid supply pipe 5, the residence time of the cold liquid in the heat exchange pipe is adjusted, thereby realizing the precise control of the temperature of the cold liquid after heat exchange, and ensuring that the temperature of the cold liquid heated by the heat exchanger meets the use requirements.

[0023] The control cabinet 3 controls the start and stop of the centrifugal pump 1 according to the comparison result of the value of the second temperature sensor 15 and the preset value. If the temperature of the discharged industrial wastewater is low and has no value to be used, the heat exchange system is automatically shut down to reduce the power consumption of the centrifugal pump 1 and ensure that the cold liquid after heat exchange through the equipment can meet the standards.

[0024] The heat exchange equipment is applied to textile factories. During the production process, the textile factories will produce waste hot water with a temperature of up to 80-90°C, and the flow rate of the waste hot water produced is 1.8 m / s. The heat exchange equipment is used to heat fresh water, and the fresh hot water produced is used for showering in the dormitory of the park. Therefore, in actual use, the preset value corresponding to the first temperature sensor 14 is set at 45°C, and the accuracy is set to 0.5°C, that is, the final preset value is 45±0.5°C. Since the efficiency of the existing heat exchanger is about 0.8, considering the temperature of the fresh water, the preset value corresponding to the second temperature sensor 15 is temporarily set at 50±0.5°C to ensure that the water temperature of the fresh water reaches 45°C after heat exchange. If the temperature of the fresh water changes, the preset value corresponding to the second temperature sensor 15 can be adjusted. The principle of adjustment is that after the waste hot water of the temperature corresponding to the preset value enters the heat exchanger, the liquid flow rate in the cold liquid supply pipe 5 is adjusted, and the fresh hot water produced must reach 45±0.5°C.

[0025] The first temperature sensor 14 and the second temperature sensor 15 are PT100 temperature sensors of Class B, and the PLC controller is Siemens S7-200 SMART, and is equipped with an analog module connected to the temperature sensors.

[0026] When the waste water temperature is 82°C, the 20°C liquid in the cold liquid supply pipe 5 enters the heat exchanger at a speed of 0.7m / s, and the first temperature sensor 14 detects that the temperature of the liquid in the cold liquid discharge pipe 12 is 51.8°C. At this time, the control cabinet 3 increases the speed of the centrifugal pump 1 to increase the flow rate of the liquid in the cold liquid supply pipe 5 until the temperature of the liquid in the cold liquid discharge pipe 12 detected by the first temperature sensor 14 is controlled at 45±0.5°C. At this time, the liquid enters the heat exchanger at a flow rate of about 0.9m / s; If the liquid in the cold liquid supply pipe 5 drops to 5°C as the air temperature drops, and enters the heat exchanger at 0.7m / s, the first temperature sensor 14 detects that the temperature of the liquid in the cold liquid discharge pipe 12 is only 42.5°C. At this time, the control cabinet 3 reduces the speed of the centrifugal pump 1 to reduce the flow rate of the liquid in the cold liquid supply pipe 5 until the first temperature sensor 14 detects that the temperature of the liquid in the cold liquid discharge pipe 12 is controlled at 45±0.5°C. At this time, the liquid enters the heat exchanger at a flow rate of about 0.63m / s. When the temperature of the waste hot water changes or the flow rate changes, it will also affect the temperature of the liquid in the cold liquid discharge pipe 12. It is only necessary to use the first temperature sensor 14 to detect the temperature of the liquid in the cold liquid discharge pipe 12, and adjust the flow rate of the liquid in the cold liquid supply pipe 5 according to the temperature result to achieve the desired preset temperature. The specific adjustment logic is to reduce the flow rate of the liquid in the cold liquid supply pipe 5 when the temperature is higher than the desired preset temperature, and increase the flow rate of the liquid in the cold liquid supply pipe 5 when the temperature is lower than the desired preset temperature. The flow rate is controlled by controlling the speed of the centrifugal pump 1. It can be seen that when multiple factors (including the temperature and flow rate of the waste hot water, and the initial temperature of the liquid in the cold liquid supply pipe 5) change, it is only necessary to adjust the temperature by controlling the flow rate of the liquid in the cold liquid supply pipe 5 to meet the use requirements.

[0027] The heat exchanger 2 includes a shell 201, a head 202 and a tube sheet 204. The head 202 is arranged at both ends of the shell 201 and is sealed and connected to the shell 201. The tube sheet 204 is fixed to the inner wall of the shell 201 and close to both ends. The edge of the tube sheet 204 is sealed and connected to the inner wall of the shell 201. A heat exchange tube 205 is arranged between the two tube sheets 204. One end of the heat exchange tube 205 is fixedly sealed and connected to the corresponding tube sheet 204, and the other end of the heat exchange tube 205 is slidingly sealed and connected to the corresponding tube sheet 204. The sliding sealing connection between the other end of the heat exchange tube 205 and the tube sheet 204 ensures that the heat exchange tube 205 has expansion space after being heated.

[0028] An upper baffle 207 and a lower baffle 208 are provided in the shell 201. The upper baffle 207 is fixed to the upper half of the inner wall of the shell 201, and the lower baffle 208 is fixed to the lower half of the inner wall of the shell 201, which increases the flow distance of industrial wastewater in the shell 201 and improves the heat exchange efficiency. The surface of the heat exchange tube 205 is slidably connected with a first cleaning plate 209 and a second cleaning plate 210. The outer contour of the first cleaning plate 209 is similar to that of the upper baffle 207 and is arranged correspondingly to the upper baffle 207. On one side, the outer contour of the second cleaning plate 210 is similar to that of the lower baffle plate 208 and is arranged correspondingly to one side of the lower baffle plate 208. The surface of the shell 201 is provided with a driving structure for driving the first cleaning plate 209 and the second cleaning plate 210 to move along the length direction of the heat exchange tube 205. The scale on the surface of the heat exchange tube 205 is scraped off by the movement of the first cleaning plate 209 and the second cleaning plate 210, thereby improving the heat exchange efficiency of the heat exchange tube 205. A support seat 211 is fixedly connected to the bottom of the shell 201.

[0029] One end of the end cap 202 is connected to a first connecting pipe 203 for the entry and exit of cold liquid. The top of the shell 201 and near both ends are connected to a second connecting pipe 206 for the entry and exit of industrial waste water. The bottom of the shell 201 is connected to a drain pipe 222, and a sealing plate is provided at one end of the drain pipe 222 to facilitate the discharge of cleaned scale.

[0030] like Figure 4 , Figure 5 As shown, there are multiple upper baffles 207 and lower baffles 208, which are staggered at equal intervals. The spacing between the first cleaning plate 209 and the second cleaning plate 210 is equal to the spacing between the upper baffle 207 and the lower baffle 208, ensuring that the synchronous movement of each cleaning plate will not interfere with the baffle.

[0031] The driving structure includes a fixed cylindrical shell 212, an annular seat 215, an internal gear ring 216 and a driving motor 220. Four fixed cylindrical shells 212 are arranged and are evenly distributed on the surface of the shell 201 in the circumferential direction. One side of the fixed cylindrical shell 212 is connected to the inside of the shell 201. The upper two fixed cylindrical shells 212 are arranged to serve the upper baffle 207, and the lower two fixed cylindrical shells 212 are arranged to serve the lower baffle 208. The annular seat 215 is fixed on the surface of the shell 201 and close to the end position. One side of the internal gear ring 216 is slidably connected to the annular seat 215. One side of the fixed cylindrical shell 212 is fixedly connected to a limited support seat 217. One side of the limited support seat 217 is slidably connected to the other side of the internal gear ring 216. The inner wall of the fixed cylindrical shell 212 is rotatably connected with a screw rod 213. The screw rod 213 One end extends to the outside of the fixed cylinder shell 212 and is fixedly connected with a gear 214, which is meshed with the inner gear ring 216. The driving motor 220 is fixed on the surface of the support seat 211 on one side, and the output shaft end of the driving motor 220 is fixedly connected with a driving gear 221, which is meshed with the inner gear ring 216. The driving motor 220 drives the inner gear ring 216 to rotate through the driving gear 221, thereby driving the corresponding screw rod 213 to rotate synchronously through the four gears 214. The surface of the screw rod 213 is threadedly connected with a moving seat 218, and one side of the moving seat 218 is fixedly connected with a connecting rod 219. The connecting rod 219 is fixedly connected to the corresponding first cleaning plate 209 and the second cleaning plate 210, and the cleaning plates are driven to move synchronously through the rotation of the screw rod 213.

[0032] Cleaning blocks 2181 for cleaning the surface of the screw rod 213 are fixedly connected to both ends of the movable seat 218. The cleaning block 2181 extends spirally along the thread direction of the screw rod 213 and is provided with a cutting edge at one end, thereby preventing scale formed on the surface of the screw rod 213 from affecting normal transmission. The thread surface is cleaned by the cutting edge, thereby ensuring normal transmission between the screw rod 213 and the movable seat 218.

[0033] The first cleaning plate 209 includes a plate body 2091, and a reinforcement frame 2092 is fixedly connected to the edge of the plate body 2091. A cleaning sleeve 2094 adapted to the heat exchange tube 205 is provided on the surface of the plate body 2091. Long holes 2093 and reinforcing ribs 2095 are also provided on the surface of the plate body 2091. The reinforcement frame 2092 and the reinforcing ribs 2095 improve the deformation resistance of the plate body 2091, thereby ensuring that the cleaning sleeve 2094 can move along the length direction of the heat exchange tube 205 to clean the surface of the heat exchange tube 205. The long holes 2093 are provided to reduce the movement resistance in the presence of cleaning fluid.

[0034] A sealing rubber ring is provided between the surface of the screw rod 213 and the fixed cylinder shell 212 to ensure the sealing performance.

[0035] The first valve body 9 and the second valve body 10 are electric valves, which are convenient for control and adjustment and improve work efficiency.

[0036] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0037] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An energy-saving heat exchange device for industrial wastewater discharge, comprising a centrifugal pump (1), a heat exchanger (2), a control cabinet (3) and a filter box (4), characterized in that: A cold liquid supply pipe (5) is connected between the outlet end of the centrifugal pump (1) and the cold liquid inlet end of the heat exchanger (2); a straight pipe (6) is connected to the outlet end of the filter box (4); a discharge pipe (7) is connected to the hot water outlet end of the heat exchanger (2); one end of the straight pipe (6) is connected to one side of the discharge pipe (7); a hot liquid supply pipe (8) is connected to the surface of the straight pipe (6); the hot liquid supply pipe (8) is connected to the hot water inlet end of the heat exchanger (2); a first valve body (9) is provided on the surface of the hot liquid supply pipe (8); a second valve body (10) is provided on the surface of the straight pipe (6) and on a side close to the discharge pipe (7); a one-way valve (11) is provided on the surface of the discharge pipe (7) and on a side close to the heat exchanger (2); a flow direction of the one-way valve (11) is consistent with the flow direction of the hot water outlet end of the heat exchanger (2). The cold liquid outlet end of the heat exchanger (2) is connected to a cold liquid discharge pipe (12), a first temperature sensor (14) for detecting the internal temperature of the cold liquid discharge pipe (12) is arranged on the surface of the cold liquid discharge pipe (12), a second temperature sensor (15) is arranged in the filter box (4), a flow meter (13) for detecting the flow rate of liquid in the cold liquid supply pipe (5) is arranged on the surface of the cold liquid supply pipe (5), the first temperature sensor (14) and the second temperature sensor (15) transmit the detection results to the control cabinet (3), the control cabinet (3) controls the rotation speed of the centrifugal pump (1) to adjust the flow rate of liquid in the cold liquid supply pipe (5) according to the comparison result of the value of the first temperature sensor (14) and the preset value, and the control cabinet (3) controls the start and stop of the centrifugal pump (1) according to the comparison result of the value of the second temperature sensor (15) and the preset value; The heat exchanger (2) comprises a shell (201), a head (202) and a tube sheet (204); a heat exchange tube (205) is arranged between the two tube sheets (204); a first cleaning plate (209) and a second cleaning plate (210) are slidably connected to the surface of the heat exchange tube (205); a driving structure for driving the first cleaning plate (209) and the second cleaning plate (210) to move along the length direction of the heat exchange tube (205) is arranged on the surface of the shell (201); and a support seat (211) is fixedly connected to the bottom of the shell (201).

2. The energy-saving heat exchange equipment for industrial wastewater discharge according to claim 1 is characterized in that: The sealing heads (202) are arranged at both ends of the shell (201) and are sealed to the shell (201); the tube sheet (204) is fixed to the inner wall of the shell (201) near both ends; an upper baffle (207) and a lower baffle (208) are arranged in the shell (201); the upper baffle (207) is fixed to the upper half of the inner wall of the shell (201); the lower baffle (208) is fixed to the lower half of the inner wall of the shell (201); the outer contour of the first cleaning plate (209) is similar to the outer contour of the upper baffle (207); The outer contour of the second cleaning plate (210) is similar to that of the lower baffle (208) and is arranged on one side of the lower baffle (208) in a corresponding manner; one end of the seal head (202) is connected to a first connecting pipe (203); the top of the shell (201) and near both ends are connected to second connecting pipes (206); the bottom of the shell (201) is connected to a sewage pipe (222); and one end of the sewage pipe (222) is provided with a sealing plate.

3. The energy-saving heat exchange equipment for industrial wastewater discharge according to claim 2 is characterized in that: The upper baffle plates (207) and the lower baffle plates (208) are provided in plurality and are staggered at equal intervals, and the spacing between the first cleaning plate (209) and the second cleaning plate (210) is equal to the spacing between the upper baffle plates (207) and the lower baffle plates (208).

4. The energy-saving heat exchange equipment for industrial wastewater discharge according to claim 1 is characterized in that: The driving structure comprises a fixed cylindrical shell (212), an annular seat (215), an internal gear ring (216) and a driving motor (220); four fixed cylindrical shells (212) are provided and are evenly distributed on the surface of the shell (201) in the circumferential direction; one side of the fixed cylindrical shell (212) is in communication with the interior of the shell (201); the annular seat (215) is fixed on the surface of the shell (201) and is close to an end position; one side of the internal gear ring (216) is slidably connected to the annular seat (215); one side of the fixed cylindrical shell (212) is fixedly connected to a limited support seat (217); one side of the limited support seat (217) is slidably connected to the other side of the internal gear ring (216); the inner wall of the fixed cylindrical shell (212) is rotatably connected to the internal gear ring (216); A screw rod (213), one end of which extends to the outside of the fixed cylinder shell (212) and is fixedly connected to a gear (214), the gear (214) being meshingly connected to an internal gear ring (216), the drive motor (220) being fixed to a surface of a support seat (211) on one side, the output shaft end of the drive motor (220) being fixedly connected to a drive gear (221), the drive gear (221) being meshingly connected to the internal gear ring (216), the surface of the screw rod (213) being threadedly connected to a moving seat (218), one side of the moving seat (218) being fixedly connected to a connecting rod (219), the connecting rod (219) being fixedly connected to the corresponding first cleaning plate (209) and second cleaning plate (210).

5. The energy-saving heat exchange equipment for industrial wastewater discharge according to claim 1 is characterized in that: One end of the filter box (4) is connected to a wastewater inlet pipe (16), a filter screen (18) is provided inside the filter box (4), and the inlet end of the centrifugal pump (1) is connected to a cold liquid inlet pipe (17).

6. The energy-saving heat exchange equipment for industrial wastewater discharge according to claim 4 is characterized by: Cleaning blocks (2181) for cleaning the surface of the screw rod (213) are fixedly connected to both ends of the movable seat (218); the cleaning block (2181) extends spirally along the thread direction of the screw rod (213) and has a cutting edge at one end.

7. The energy-saving heat exchange equipment for industrial wastewater discharge according to claim 1 is characterized by: The first cleaning plate (209) comprises a plate body (2091), a reinforcement frame (2092) being fixedly connected to the edge of the plate body (2091), a cleaning sleeve (2094) adapted to the heat exchange tube (205) being provided on the surface of the plate body (2091), and long strip holes (2093) and reinforcing ribs (2095) being also provided on the surface of the plate body (2091).

8. The energy-saving heat exchange equipment for industrial wastewater discharge according to claim 1 is characterized by: One end of the heat exchange tube (205) is fixedly sealed and connected to the corresponding tube sheet (204), and the other end of the heat exchange tube (205) is slidably sealed and connected to the corresponding tube sheet (204).

9. The energy-saving heat exchange equipment for industrial wastewater discharge according to claim 4, characterized in that: A sealing rubber ring is provided between the surface of the screw rod (213) and the fixed cylinder shell (212).

10. The energy-saving heat exchange equipment for industrial wastewater discharge according to claim 1, characterized in that: The first valve body (9) and the second valve body (10) are electric valves.

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