CN220250821U - Shell-and-tube heat exchanger - Google Patents

Abstract

The application relates to a shell-and-tube heat exchanger belongs to heat exchanger technical field, and shell-and-tube heat exchanger includes shell pipe and the heat exchange coil who sets up in the shell intraductal, the shell pipe intercommunication has charge pipe and blow off pipe, the charge pipe is located the blow off pipe top, all be provided with first electric valve on charge pipe and the blow off pipe, shell-and-tube heat exchanger is still including being used for letting in the dosing device of scale removal medicament to the charge intraductal. The scale remover has the advantages of being convenient for scale removal of the inner wall of the shell tube and the outer wall of the heat exchange coil, and being beneficial to improving heat exchange efficiency.

Description

Shell-and-tube heat exchanger

Technical Field

The application relates to the technical field of heat exchangers, in particular to a shell-and-tube heat exchanger.

Background

In spa engineering, shell and tube heat exchangers are typically used for heat exchange. The shell-and-tube heat exchanger is one of the heat exchangers, and performs heat exchange by flowing one of cold fluid and hot fluid in a tube pass and the other fluid in a shell pass.

In the related art, the shell-and-tube heat exchanger comprises a shell tube and a heat exchange coil arranged in the shell tube, wherein two ends of the shell tube are respectively communicated with a water inlet pipe and a water outlet pipe, two ends of the heat exchange coil are respectively communicated with a water supply pipe and a water return pipe, and the water supply pipe and the water return pipe penetrate out of the shell tube. When the floor heating water heater is used, floor heating water is connected to the water supply pipe of the heat exchange coil, floor heating water flows out from the water return pipe through the heat exchange coil, hot spring water with the temperature higher than that of the floor heating water is connected to the water inlet pipe of the shell pipe, and the hot spring water flows out from the water outlet pipe through the shell pipe, so that heat exchange is realized.

Aiming at the related technology, the hot spring water contains calcium and magnesium ions, so that the scale is easy to form on the inner wall of the shell pipe and the outer wall of the heat exchange coil after the hot spring water is used for a period of time, and the heat exchange efficiency is reduced.

Disclosure of Invention

For being convenient for to shell and tube inner wall and heat exchange coil outer wall scale removal, help improving heat exchange efficiency, this application provides a shell and tube heat exchanger.

The application provides a shell-and-tube heat exchanger adopts following technical scheme:

the shell-and-tube heat exchanger comprises a shell tube and a heat exchange coil arranged in the shell tube, wherein the shell tube is communicated with a dosing tube and a sewage drain tube, the dosing tube is positioned above the sewage drain tube, and the dosing tube and the sewage drain tube are both provided with first electric valves, and the shell-and-tube heat exchanger further comprises a dosing device used for introducing a scale cleaning agent into the dosing tube.

Preferably, the shell pipe is communicated with a water inlet pipe, the shell pipe is communicated with a bubble generator, and a first connecting pipe is communicated between the water inlet pipe and the bubble generator.

Preferably, the dosing device comprises a dosing box, a water pipe communicated with the dosing box, a dosing pipe communicated with the dosing box and a dosing box for storing scale removing drugs, wherein one end of the dosing pipe, far away from the shell pipe, is communicated with the dosing box, the water pipe and the dosing pipe are provided with second electric valves, the water pipe is communicated with an external water source, and one end of the dosing pipe, far away from the dosing box, is communicated with the dosing box.

Preferably, the stirring shovel is rotatably arranged in the dosing box, and the dosing box is provided with a driving source for driving the stirring shovel to rotate.

Preferably, the shell tube rotates and wears to be equipped with the rotation pipe, the axis of rotation pipe is on a parallel with the length direction of shell tube, the one end that the dosing case was kept away from to the dosing tube rotates with the rotation pipe to be connected, the one end that the rotation pipe is located the shell tube is provided with the shower nozzle, the shell tube is provided with the rotating member that is used for driving the rotation pipe to rotate.

Preferably, one end of the dosing tube, which is far away from the dosing box, is communicated with a second connecting tube, and the second connecting tube is communicated with the bubble generator.

Preferably, the two ends of the heat exchange coil are respectively communicated with a water supply pipe and a water return pipe, the water supply pipe and the water return pipe are respectively provided with a first thermometer, the shell pipe is communicated with a water outlet pipe, the water inlet pipe, the water outlet pipe and the water supply pipe are respectively provided with a third electric valve, the shell pipe is provided with a controller, the first electric valves, the third electric valves and the first thermometers are respectively connected with the controller, and when the third electric valves on the water outlet pipe are in an open state, the temperature measured by the first thermometers on the water return pipe is smaller than a first preset threshold value, and the temperature difference between the two first thermometers is smaller than a second preset threshold value, the controller closes the third electric valves on the water inlet pipe, the water outlet pipe and the water supply pipe, and opens the first electric valves on the dosing pipe.

Preferably, when the temperature measured by the first temperature detector on the water return pipe is greater than a third preset threshold value, the controller closes a third electric valve on the water outlet pipe; when the temperature measured by the first temperature measuring instrument on the water return pipe is smaller than a first preset threshold value and the third electric valve on the water outlet pipe is in a closed state, the controller opens the third electric valve on the water outlet pipe.

Preferably, the shell tube is provided with an external endoscope for observing the inner wall of the shell tube and the outer wall of the heat exchange coil.

In summary, the present application includes the following beneficial technical effects:

through stopping the heat exchanger, open the first electric valve on the charge pipe, close the first electric valve on the blow off pipe, let in the scale removal medicament to the charge intraductal through charge device, the scale removal medicament gets into in the shell pipe, make scale removal medicament submergence heat exchange coil, rest a period of time, the scale removal medicament makes the dirt of shell pipe inner wall and heat exchange coil outer wall drop, then open the first electric valve on the blow off pipe, the scale removal medicament and the dirt in the shell pipe are discharged through the blow off pipe this moment, realize carrying out the scale removal to shell pipe inner wall and heat exchange coil outer wall, thereby help improving the heat exchange efficiency of heat exchanger.

Drawings

Fig. 1 is a schematic overall structure of an embodiment of the present application.

Fig. 2 is a partial structural cross-sectional view of an embodiment of the present application.

Fig. 3 is an enlarged view of a portion a in fig. 2.

Reference numerals illustrate: 1. a shell tube; 2. a heat exchange coil; 3. a dosing tube; 4. a blow-down pipe; 5. a first electrically operated valve; 6. a dosing device; 61. a dosing box; 62. a water pipe; 63. a medicine inlet pipe; 64. a medicine storage box; 7. a water inlet pipe; 8. a bubble generator; 9. a first connection pipe; 10. a second electrically operated valve; 11. a stirring shovel; 12. a rotary tube; 13. a spray head; 14. a rotating member; 141. a driving motor; 142. a first gear; 143. a second gear; 15. a second connection pipe; 16. a water supply pipe; 17. a water return pipe; 18. a first thermometer; 19. a water outlet pipe; 20. a controller; 21. an external endoscope; 211. a display panel; 212. a detection tube; 213. a probe; 22. a support frame; 23. a stepping motor; 24. a second thermometer; 25. and a third electrically operated valve.

Detailed Description

The present application is described in further detail below in conjunction with figures 1-3.

The embodiment of the application discloses a shell-and-tube heat exchanger. Referring to fig. 1 and 2, the shell-and-tube heat exchanger comprises a shell tube 1 and a heat exchange coil 2 fixedly installed in the shell tube 1, wherein the shell tube 1 is a stainless steel shell tube, the shell tube 1 is arranged along the vertical direction, the lower end of the shell tube 1 is communicated with a water inlet pipe 7, and the upper end of one side, far away from the water inlet pipe 7, of the shell tube 1 is communicated with a water outlet pipe 19; the heat exchange coil pipe 2 is a stainless steel heat exchange coil pipe, two ends of the heat exchange coil pipe 2 are respectively communicated with a water supply pipe 16 and a water return pipe 17, the water supply pipe 16 is fixedly arranged at the lower end of the shell pipe 1 in a penetrating mode, the water return pipe 17 is fixedly arranged at the upper end of the shell pipe 1 in a penetrating mode, the water supply pipe 16 is located at one side, close to the water outlet pipe 19, of the shell pipe 1, the water return pipe 17 is located at one side, close to the water inlet pipe 7, of the shell pipe 1, and third electric valves 25 are arranged on the water inlet pipe 7, the water outlet pipe 19 and the water supply pipe 16.

Referring to fig. 1 and 2, a dosing tube 3 is fixedly arranged at the top of a shell tube 1, one end, close to the shell tube 1, of the dosing tube 3 is rotationally connected with a rotating tube 12, the rotating tube 12 is rotationally arranged on the top wall of the shell tube 1 in a penetrating manner, the rotating axis of the rotating tube 12 is parallel to the length direction of the shell tube 1, the rotating tube 12 is positioned above a water outlet tube 19 and a water return tube 17, one end of the rotating tube 12 is communicated with the shell tube 1, and the other end of the rotating tube 12 is communicated with the dosing tube 3, so that the dosing tube 3 is communicated with the shell tube 1 through the rotating tube 12; the shell tube 1 bottom intercommunication has blow off pipe 4, and blow off pipe 4 is located the below of inlet tube 7 and delivery pipe 16, and blow off pipe 4 is used for with water supply and drainage intercommunication, and equal fixed mounting has first electric valve 5 on dosing pipe 3 and the blow off pipe 4, and dosing pipe 3 is located blow off pipe 4 top, and shell-and-tube heat exchanger still includes dosing device 6, and dosing device 6 is used for letting in the scale removal medicament to dosing pipe 3. In this embodiment, the inlet temperature of the hot spring water is designed to be 60 degrees celsius, the outlet temperature of the outlet pipe 19 is designed to be 50 degrees celsius, the supply temperature of the ground heating water is designed to be 40 degrees celsius, and the return water temperature of the return pipe 17 is designed to be 50 degrees celsius.

When the heat exchanger works, the first electric valve 5 on the dosing pipe 3 and the sewage pipe 4 is closed, the water inlet pipe 7, the water outlet pipe 19 and the third electric valve 25 on the water inlet pipe 16 are opened, ground heating water enters the heat exchange coil pipe 2 from the water inlet pipe 16 and then flows out from the water return pipe 17, hot spring water enters the shell pipe 1 from the water inlet pipe 7 and flows out from the water outlet pipe 19, and the hot spring water in the shell pipe 1 exchanges heat with the ground heating water in the heat exchange coil pipe 2. When the inner wall of the shell tube 1 and the outer wall of the heat exchange coil 2 are scaled, the third electric valve 25 on the water inlet pipe 7, the water outlet pipe 19 and the water supply pipe 16 is closed, then the first electric valve 5 on the dosing tube 3 is opened, the first electric valve 5 on the sewage discharge tube 4 is closed, the scale cleaning agent is introduced into the dosing tube 3 through the dosing device 6, enters the shell tube 1 through the rotating tube 12, the scale cleaning agent submerges the heat exchange coil 2, the scales on the inner wall of the shell tube 1 and the outer wall of the heat exchange coil 2 are removed, after a period of standing, the first electric valve 5 on the sewage discharge tube 4 is opened, and the scale cleaning agent in the shell tube 1 and the fallen scales are discharged through the sewage discharge tube 4, so that the heat exchange efficiency of the heat exchanger is improved.

Referring to fig. 1 and 2, in order to facilitate the introduction of the scale removing agent into the dosing tube 3, the dosing device 6 includes a dosing tank 61, a water pipe 62, a dosing tube 63 and a drug storage tank 64, the dosing tank 61 is fixed on the top wall of the shell tube 1 by the support frame 22, one end of the dosing tube 3, which is far away from the rotary tube 12, is communicated with the lower end of the dosing tank 61, the water pipe 62 and the dosing tube 63 are both communicated on the top wall of the dosing tank 61, the drug storage tank 64 is communicated with one end of the dosing tube 63, which is far away from the dosing tank 61, the drug storage tank 64 is used for storing powder drugs or concentrated drugs, the water pipe 62 is used for being communicated with an external water source, and the water pipe 62 and the dosing tube 63 are both provided with the second electric valve 10.

Referring to fig. 1 and 2, the stirring shovel 11 is rotatably disposed in the dosing tank 61, the rotation axis of the stirring shovel 11 is parallel to the length direction of the casing pipe 1, a driving source for driving the stirring shovel 11 to rotate is disposed on the dosing tank 61, the driving source comprises a stepping motor 23 fixedly mounted on the top wall of the dosing tank 61, the stirring shovel 11 is coaxially fixed with the output shaft of the stepping motor 23, and in other embodiments, the stepping motor 23 can be replaced by a servo motor.

When the scale cleaning agent needs to be prepared, the second electric valve 10 on the water pipe 62 and the medicine inlet pipe 63 is opened, the agent and the water are added into the medicine adding box 61 according to the proportion, or the agent is directly added into the medicine adding box 61, then the stepping motor 23 is started, the stepping motor 23 drives the stirring shovel 11 to rotate, the stirring shovel 11 uniformly mixes the agent and the water, and the effect of the scale cleaning agent is improved; then the first electric valve 5 on the dosing pipe 3 is opened, so that the medicament in the dosing box 61 is led into the dosing pipe 3, and the scale cleaning medicament is convenient to enter the shell pipe 1 to clean the scale on the inner wall of the shell pipe 1 and the outer wall of the heat exchange coil pipe 2. After the scale cleaning agent in the shell tube 1 is discharged, the second electric valve 10 on the water delivery pipe 62 and the first electric valve 5 on the dosing tube 3 are opened, so that clean water enters the shell tube 1, residues on the outer wall of the heat exchange coil 2 and the inner wall of the shell tube 1 are discharged, the scale cleaning effect is ensured, and the heat exchange efficiency of the heat exchanger is further ensured.

Referring to fig. 2 and 3, one end of the rotary tube 12 located in the shell tube 1 is communicated with the spray head 13, the spray head 13 is disc-shaped, a rotary member 14 for driving the rotary tube 12 to rotate is arranged on the shell tube 1, the rotary member 14 comprises a driving motor 141, a first gear 142 and a second gear 143, the driving motor 141 is fixedly arranged on the top wall of the shell tube 1, the first gear 142 is coaxially fixed with an output shaft of the driving motor 141, the second gear 143 is fixedly sleeved on one end of the rotary tube 12 close to the dosing tube 3, and the first gear 142 is meshed with the second gear 143. In other embodiments, the first gear 142 and the second gear 143 may be replaced by a worm gear and a worm, where the worm is coaxially fixed to the output shaft of the driving motor 141, the worm gear is fixedly sleeved on the rotating tube 12, the worm is meshed with the worm gear, and the driving motor 141 drives the worm to rotate, so that the worm drives the worm gear to rotate, and the rotation of the rotating tube 12 can be achieved.

When the inner wall of the shell tube 1 and the outer wall of the heat exchange coil 2 are required to be descaled, the driving motor 141 is started, the driving motor 141 drives the first gear 142 to rotate, the first gear 142 drives the second gear 143 to rotate, and the second gear 143 drives the rotating tube 12 to rotate, so that the spray head 13 is enabled to rotate, the spraying range of the scale removal agent sprayed by the spray head 13 is wide, the scale removal effect is ensured, and the heat exchange efficiency of the heat exchanger is improved.

Referring to fig. 1 and 2, a bubble generator 8 is communicated with the casing 1, the bubble generator 8 is located at the lower end of the casing 1, the bubble generator 8 is located above the water inlet pipe 7, a first connecting pipe 9 is communicated between the water inlet pipe 7 of the casing 1 and the bubble generator 8, and the first connecting pipe 9 is located at one side of a third electric valve 25 on the water inlet pipe 7, which is close to the casing 1. The bubble generator 8 belongs to the prior art, and the specific structure of the interior thereof is not repeated.

When the heat exchanger works, the first connecting pipe 9 is connected with hot spring water in the water inlet pipe 7, the bubble generator 8 is started, hot spring water mixed air entering the bubble generator 8 forms hot spring water containing micro-nano bubbles to enter the shell pipe 1, and the micro-nano bubbles in the shell pipe 1 adsorb stains in the hot spring water to flow towards the water outlet pipe 19, so that the scaling time can be prolonged, and meanwhile, the heat exchange efficiency is guaranteed.

Referring to fig. 1 and 2, the end of the dosing tube 3 remote from the dosing tank 61 is connected to a second connecting tube 15, and the end of the second connecting tube 15 remote from the dosing tube 3 is connected to the bubble generator 8. When the descaling is started, a part of the descaling agent in the dosing tube 3 enters the bubble generator 8 through the second connecting tube 15, the descaling agent containing micro-nano bubbles is formed in the bubble generator 8 and then enters the shell tube 1, and the micro-nano bubbles in the shell tube 1 adsorb stains, so that the descaling effect is improved, and the heat exchange efficiency of the heat exchanger is ensured.

Referring to fig. 1 and 2, an external endoscope 21 for observing the inner wall of the casing 1 and the outer wall of the heat exchange coil 2 is provided on the casing 1, the external endoscope 21 includes a display panel 211, a probe tube 212 and a probe 213, the display panel 211 is installed on the outer wall of the casing 1, the probe tube 212 is connected with the display panel 211, the probe tube 212 is installed on the casing 1 in a penetrating manner, the probe 213 is fixedly installed on one side of the probe tube 212 far from the display panel 211, and the probe 213 is located in the casing 1. The display panel 211 is used for helping to observe the scaling or descaling of the inner wall of the shell tube 1 and the outer wall of the heat exchange coil 2.

Referring to fig. 1 and 2, the first thermo-detector 18 is installed on both the water supply pipe 16 and the water return pipe 17, the controller 20 is installed on the casing 1, the first electric valve 5, the third electric valve 25, the second electric valve 10, the driving motor 141 (refer to fig. 3), the stepping motor 23, the bubble generator 8, and the first thermo-detector 18 are all connected with the controller 20, and when the third electric valve 25 on the water outlet pipe 19 is in an open state, the temperature measured by the first thermo-detector 18 on the water return pipe 17 is less than a first preset threshold value, and the temperature difference between the two first thermo-detectors 18 is less than a second preset threshold value, the controller 20 closes the third electric valve 25 on the water inlet pipe 7, the water outlet pipe 19, and the water supply pipe 16, and opens the first electric valve 5 on the dosing pipe 3. Wherein the first preset threshold is 50 degrees celsius and the second preset threshold is 10 degrees celsius.

When the third electric valve 25 on the water outlet pipe 19 is in an open state, the heat exchanger is proved to be in a working state, and when the temperature measured by the first thermometer 18 on the water return pipe 17 is less than 50 ℃ and the temperature difference between the water supply pipe 16 and the water return pipe 17 is less than 10 ℃, the heat exchange efficiency of the heat exchanger is proved to be reduced, the controller 20 controls the water inlet pipe 7, the water outlet pipe 19 and the third electric valve 25 on the water supply pipe 16 to be closed, namely, the heat exchanger stops working, so that the first electric valve 5 on the dosing pipe 3 is opened, the mixed scale cleaning agent respectively enters the second connecting pipe 15 and the rotating pipe 12 through the dosing pipe 3, a scale removal mode is started, and meanwhile, the standby heat exchanger is started.

Referring to fig. 1 and 2, when the temperature measured by the first thermometer 18 on the water return pipe 17 is greater than the third preset threshold, it is proved that the temperature of the water outlet on the water return pipe 17 is greater than the design requirement, and the controller 20 controls the third electric valve 25 on the water outlet pipe 19 to be closed, wherein the third preset threshold is 55 ℃. When the temperature measured by the first thermometer 18 on the water return pipe 17 is less than the first preset threshold and the third electrically operated valve 25 on the water outlet pipe 19 is in a closed state, the controller 20 controls the third electrically operated valve 25 on the water outlet pipe 19 to be opened. When the third electric valve 25 on the water outlet pipe 19 is in a closed state, the heat exchanger is proved to be in a heat exchange stop state, and at the moment, the water outlet temperature at the water return pipe 17 is lower than the design requirement, and the third electric valve 25 on the water outlet pipe 19 is opened to continue heat exchange.

Referring to fig. 1 and 2, a second thermometer 24 is installed in the casing 1, and the second thermometer 24 is connected to the controller 20. When the descaling is completed and the temperature measured by the second thermometer 24 is less than 40 ℃, the controller 20 opens the first electrically operated valve 5 on the drain pipe 4 to meet the requirement of the sewage.

The implementation principle of the embodiment of the application is as follows: when the heat exchanger works, the first electric valve 5 on the dosing pipe 3 and the blow-off pipe 4 is closed, the water inlet pipe 7, the water outlet pipe 19 and the third electric valve 25 on the water inlet pipe 16 are opened, ground heating water enters the heat exchange coil pipe 2 from the water inlet pipe 16 and then flows out from the water return pipe 17, hot spring water is divided into two paths from the water inlet pipe 7, one path enters the shell pipe 1, the other path enters the bubble generator 8 through the first connecting pipe 9 to mix air to form hot spring water containing micro-nano bubbles, the micro-nano bubbles in the shell pipe 1 absorb stains in the hot spring water, then flows out from the water outlet pipe 19, and the hot spring water in the shell pipe 1 exchanges heat with the ground heating water in the heat exchange coil pipe 2 in the process, so that the scaling time of the inner wall of the shell pipe 1 and the outer wall of the heat exchange coil pipe 2 is prolonged under the action of the bubble generator 8, and the heat exchange efficiency is improved to a certain extent.

When the third electric valve 25 on the water outlet pipe 19 is in an open state, the temperature measured by the first thermometer 18 on the water return pipe 17 is less than 50 ℃ and the temperature difference between the two first thermometers 18 is less than 10 ℃, the controller 20 closes the third electric valve 25 on the water inlet pipe 7, the water outlet pipe 19 and the water supply pipe 16, opens the second electric valve 10, adds the medicament and water into the dosing tank 61, then closes the second electric valve 10, starts the stepping motor 23 to drive the stirring shovel 11 to uniformly mix the scale cleaning medicament, then opens the first electric valve 5 on the dosing pipe 3, closes the first electric valve 5 on the drain pipe 4, the scale cleaning medicament in the dosing tank 61 is introduced into the dosing pipe 3, one path of the scale cleaning medicament enters the bubble generator 8 through the second connecting pipe 15, the other path of the scale cleaning medicament enters the shell pipe 1 through the rotating pipe 12, the first gear 142 and the second gear 143 are driven, the rotation of the spray nozzle 13 is realized, the micro-bubble-containing cleaning medicament formed at the bubble generator 8 enters the shell pipe 1, the scale cleaning medicament 2 is separated from the inner wall of the heat exchange shell 2 and the heat exchange shell 4 after the scale cleaning medicament is immersed in the shell 1, the scale cleaning medicament is separated from the inner wall of the heat exchange shell 2, the scale cleaning medicament is immersed in the heat exchange shell 4 after the scale cleaning medicament is separated from the inner wall of the heat exchange shell 4, and the scale cleaning medicament is kept for a period of time, and the scale cleaning efficiency is improved after the scale cleaning medicament is kept by the scale is kept by the heat, and the scale is discharged through the heat and the heat is kept by the heat, and after the scale is kept by a heat.

The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.

Claims (9)

1. The utility model provides a shell-and-tube heat exchanger, includes shell and tube (1) and sets up heat exchange coil (2) in shell and tube (1), its characterized in that: the shell-and-tube heat exchanger is characterized in that the shell-and-tube heat exchanger is communicated with a dosing tube (3) and a sewage drain tube (4), the dosing tube (3) is located above the sewage drain tube (4), the dosing tube (3) and the sewage drain tube (4) are both provided with a first electric valve (5), and the shell-and-tube heat exchanger further comprises a dosing device (6) used for introducing a scale removal medicament into the dosing tube (3).

2. A shell and tube heat exchanger as claimed in claim 1, wherein: the shell and tube (1) is communicated with a water inlet pipe (7), the shell and tube (1) is communicated with a bubble generator (8), and a first connecting pipe (9) is communicated between the water inlet pipe (7) and the bubble generator (8).

3. A shell and tube heat exchanger as claimed in claim 2, wherein: the dosing device (6) comprises a dosing box (61), a water delivery pipe (62) communicated with the dosing box (61), a dosing pipe (63) communicated with the dosing box (61) and a medicine storage box (64) used for storing scale removal medicines, one end, far away from the shell pipe (1), of the dosing pipe (3) is communicated with the dosing box (61), the water delivery pipe (62) and the dosing pipe (63) are provided with second electric valves (10), the water delivery pipe (62) is communicated with an external water source, and one end, far away from the dosing box (61), of the dosing pipe (63) is communicated with the medicine storage box (64).

4. A shell and tube heat exchanger according to claim 3, wherein: the stirring shovel (11) is rotationally arranged in the dosing box (61), and the dosing box (61) is provided with a driving source for driving the stirring shovel (11) to rotate.

5. A shell and tube heat exchanger according to claim 3, wherein: the shell tube (1) rotates and wears to be equipped with rotatory pipe (12), the axis of rotation of rotatory pipe (12) is on a parallel with the length direction of shell tube (1), the one end that dosing tank (61) was kept away from to dosing tube (3) is connected with rotation pipe (12) rotation, one end that rotation pipe (12) are located shell tube (1) is provided with shower nozzle (13), shell tube (1) is provided with and is used for driving rotatory rotating member (14) of rotatory pipe (12).

6. A shell and tube heat exchanger according to claim 3, wherein: one end of the dosing pipe (3) far away from the dosing box (61) is communicated with a second connecting pipe (15), and the second connecting pipe (15) is communicated with the bubble generator (8).

7. A shell and tube heat exchanger as claimed in claim 2, wherein: the utility model discloses a heat exchange coil (2) with the heat transfer, heat transfer coil (2) is equipped with delivery pipe (16) and wet return (17) respectively, all install first thermometer (18) on delivery pipe (16) and wet return (17), the intercommunication has outlet pipe (19) on shell pipe (1), all install third electric valve (25) on inlet tube (7), outlet pipe (19) and delivery pipe (16), be provided with controller (20) on shell pipe (1), first electric valve (5), third electric valve (25), first thermometer (18) all are connected with controller (20), works as third electric valve (25) on outlet pipe (19) are for opening state, when the temperature that first thermometer (18) were measured on wet return (17) is less than first default threshold value and the difference in temperature between two first thermometers (18) is less than second default threshold value, controller (20) close inlet tube (7), outlet pipe (19) and third electric valve (25) on delivery pipe (16), open first electric valve (5) that adds on watering pipe (3).

8. A shell and tube heat exchanger as set forth in claim 7 wherein: when the temperature measured by the first thermometer (18) on the water return pipe (17) is greater than a third preset threshold value, the controller (20) closes a third electric valve (25) on the water outlet pipe (19); when the temperature measured by the first thermometer (18) on the water return pipe (17) is smaller than a first preset threshold value and the third electric valve (25) on the water outlet pipe (19) is in a closed state, the controller (20) opens the third electric valve (25) on the water outlet pipe (19).

9. A shell and tube heat exchanger according to any one of claims 1-8, wherein: the shell tube (1) is provided with an external endoscope (21) for observing the inner wall of the shell tube (1) and the outer wall of the heat exchange coil (2).