CN113203308B

CN113203308B - Remote speed difference three-heat-source shell-and-tube heat exchanger

Info

Publication number: CN113203308B
Application number: CN202010567565.3A
Authority: CN
Inventors: 刘延华; 王鑫; 郭亮; 张海静; 刘昳娟; 鞠文杰; 王为帅; 孙卓新; 潘佳; 王者龙; 牛蔚然; 韩小岗; 王志梁; 邱燕; 魏民; 张井志; 其他发明人请求不公开姓名
Original assignee: State Grid Shandong Integrated Energy Service Co ltd; Shandong University; State Grid Shandong Electric Power Co Ltd
Current assignee: State Grid Shandong Integrated Energy Service Co ltd; Shandong University; State Grid Shandong Electric Power Co Ltd
Priority date: 2020-06-19
Filing date: 2020-06-19
Publication date: 2022-05-06
Anticipated expiration: 2040-06-19
Also published as: CN113203308A

Abstract

The invention provides a remote speed difference three-heat-source shell-and-tube heat exchanger, wherein a controller is connected with a cloud server, the cloud server is connected with a client, the controller transmits the speed difference or the accumulated speed difference change to the cloud server, the speed difference or the accumulated speed difference change is transmitted to the client through the cloud server, a user can select an automatic control or manual control working mode at the client, and the controller controls the working mode selected by the user to control whether a first heat source, a third heat source and a second heat source are heated or not. The invention realizes the automatic control of the heat source through the speed difference through the controller, realizes the remote portable monitoring, ensures that the result is more accurate, and does not have the problem of error increase caused by aging due to the problem of running time.

Description

Remote speed difference three-heat-source shell-and-tube heat exchanger

Technical Field

The invention relates to a shell-and-tube heat exchanger, in particular to a shell-and-tube heat exchanger for intermittent vibration descaling.

Background

The shell-and-tube heat exchanger is widely applied to industries such as chemical industry, petroleum industry, refrigeration industry, nuclear energy industry, power industry and the like, and due to the worldwide energy crisis, the demand of the heat exchanger in industrial production is more and more, and the quality requirement of the heat exchanger is higher and more. In recent decades, although compact heat exchangers (plate type, plate fin type, pressure welded plate type, etc.), heat pipe type heat exchangers, direct contact type heat exchangers, etc. have been rapidly developed, because the shell and tube type heat exchangers have high reliability and wide adaptability, they still occupy the domination of yield and usage, and according to relevant statistics, the usage of the shell and tube type heat exchangers in the current industrial devices still accounts for about 70% of the usage of all heat exchangers.

After the shell-and-tube heat exchanger is scaled, the heat exchanger is cleaned by adopting conventional modes of steam cleaning, back flushing and the like, and the production practice proves that the effect is not good. The end socket of the heat exchanger can only be disassembled, and a physical cleaning mode is adopted, but the mode is adopted for cleaning, so that the operation is complex, the consumed time is long, the investment of manpower and material resources is large, and great difficulty is brought to continuous industrial production.

The mode of passively strengthening heat exchange is to strictly prevent the fluid vibration induction in the heat exchanger from being changed into effective utilization of vibration, so that the convective heat transfer coefficient of the transmission element at low flow speed is greatly improved, dirt on the surface of the heat transfer element is restrained by vibration, the thermal resistance of the dirt is reduced, and the composite strengthened heat transfer is realized.

In application, it is found that continuous heating can cause the internal fluid to form stability, i.e. the fluid does not flow or has little fluidity, or the flow is stable, so that the vibration performance of the heat exchange tube is greatly weakened, thereby affecting the descaling of the heat exchange tube and the heating efficiency.

Current shell and tube heat exchangers include dual headers, one header evaporating and one header condensing, thereby forming a vibrating descaled heat pipe. Thereby improving the heat exchange efficiency of the heat pipe and reducing scaling. However, the heat pipe has insufficient uniformity of heat exchange, only one side is used for condensation, and the heat exchange amount is small, so that improvement is needed to develop a heat pipe system with a novel structure. There is therefore a need for improvements to the above-described heat exchangers.

In the prior application, a three-heat-source shell-and-tube heat exchanger has been developed, but the shell-and-tube heat exchanger is controlled according to the period, so that the vibration heat exchange effect is poor, the intelligent degree is lower, and the remote control cannot be realized. The present application therefore provides further improvements over the previous studies.

Disclosure of Invention

The invention provides an electric heating shell-and-tube heat exchanger with a novel structure, aiming at the defects of the shell-and-tube heat exchanger in the prior art. The shell-and-tube heat exchanger can remotely realize the periodic frequent vibration of the heat exchange tube, and improves the heating efficiency, thereby realizing good descaling and heating effects.

In order to achieve the purpose, the invention adopts the following technical scheme:

a loop heat pipe exchanger switched according to speed difference comprises a shell, wherein two ends of the shell are respectively provided with a pipe plate, a heat exchange component is arranged in the shell, the heat exchange component comprises a central tube, a left tube, a right tube and a tube group, the tube group comprises a left tube group and a right tube group, the left tube group is communicated with the left tube and the central tube, the right tube group is communicated with the right tube and the central tube, the central tube, the left tube, the central tube and the right tube are respectively provided with a first heat source, a second heat source and a third heat source, each tube group comprises a plurality of circular arc-shaped annular tubes, the end parts of the adjacent annular tubes are communicated, so that the plurality of annular tubes form a serial structure, and the end parts of the annular tubes form free ends of the annular tubes; the central tube comprises a first tube orifice and a second tube orifice, the first tube orifice is connected with the inlet of the left tube group, the second tube orifice is connected with the inlet of the right tube group, the outlet of the left tube group is connected with the left tube, and the outlet of the right tube group is connected with the right tube; the first pipe orifice and the second pipe orifice are arranged on the same side of the central pipe, and the left pipe group and the right pipe group are in mirror symmetry along the plane of the axis of the central pipe; a left return pipe is arranged between the left side pipe and the central pipe, and a right return pipe is arranged between the right side pipe and the central pipe; the system is characterized in that a speed sensing element is arranged inside a free end of the tube bundle and used for detecting the flow velocity of fluid in the free end of the tube bundle, the speed sensing element is in data connection with a controller, the controller extracts flow velocity data according to a time sequence, the flow velocity data in adjacent time periods are compared to obtain the flow velocity difference or the accumulation of the flow velocity difference change, the controller is connected with a cloud server, the cloud server is connected with a client, the controller transmits the speed difference or the accumulation of the speed difference change to the cloud server and then transmits the speed difference or the accumulation of the speed difference change to the client through the cloud server, a user can select an automatic control or manual control working mode at the client, and the controller controls the working mode selected by the client to control whether the first heat source, the third heat source and the second heat source are heated or not.

Preferably, in a manual control working mode, a user obtains speed difference or accumulated data of speed difference change according to a client, a control signal is manually input at the client, and then the control signal is transmitted to the central controller through the cloud server, and the central controller controls whether the first heat source, the third heat source and the second heat source are heated or not according to the signal input by the client.

Preferably, in the automatic control mode, the controller controls whether or not the first, third and second heat sources heat when the speed difference or the cumulative value of changes in the speed difference is less than a threshold value.

Preferably, when the first and third heat sources perform heating and the second heat source does not perform heating, if the flow rate in the previous time period is V1 and the flow rate in the adjacent subsequent time period is V2, if the difference between V2 and V1 is lower than a threshold value, the controller controls the first and third heat sources to stop heating and the second heat source to perform heating;

when the second heat source performs heating and the first third heat source does not perform heating, if the flow rate of the previous time period is V1 and the flow rate of the adjacent subsequent time period is V2, and if the difference value between V2 and V1 is lower than a threshold value, the controller controls the first third heat source to perform heating and the second heat source to stop heating.

Preferably, the heat source is an electric heater.

The invention has the following advantages:

1. the invention realizes the remote automatic control of the heat source through the speed difference by the controller, and increases the heat exchange effect and the descaling effect.

2. The flow velocity difference or the cumulative flow velocity difference of the previous and subsequent time periods detected by the flow velocity sensing element can be used for judging that the evaporation of the fluid inside is basically saturated and the volume of the fluid inside is not changed greatly. So that the fluid undergoes volume reduction to thereby realize vibration. When the flow rate difference is reduced to a certain extent, the internal fluid starts to enter a steady state again, and heating is needed to evaporate and expand the fluid again, so that a starting heat source is needed for heating. The steady state of the fluid is judged according to the flow rate difference or the accumulation of the flow rate difference change, so that the result is more accurate, and the problem of error increase caused by aging due to the operation time problem is solved.

3. The 3 heat sources of the invention heat alternately in a period, and can realize frequent vibration of the elastic coil, thereby realizing good descaling and heating effects and ensuring that the heating power is basically the same in time.

4. The invention increases the heating power of the coil pipe periodically and continuously and reduces the heating power, so that the heated fluid can generate the volume which is continuously in a changing state after being heated, and the free end of the coil pipe is induced to generate vibration, thereby strengthening heat transfer.

5. The heating efficiency can be further improved by the arrangement of the pipe diameter and the interval distribution of the pipe groups in the length direction.

6. The invention optimizes the optimal relation of the parameters of the shell-and-tube heat exchanger through a large amount of experiments and numerical simulation, thereby realizing the optimal heating efficiency.

7. The invention designs a triangular layout diagram of a multi-heat exchange component with a novel structure, optimizes the structural parameters of the layout, and can further improve the heating efficiency through the layout.

Description of the drawings:

fig. 1 is a schematic view of a housing structure.

Fig. 2 is a top view of a heat exchange member of the present invention.

Fig. 3 is a front view of the heat exchange member of the present invention.

Fig. 4 is a front view of another embodiment of a heat exchange member of the present invention.

Fig. 5 is a dimensional structure schematic diagram of the heat exchange component of the invention.

Fig. 6 is a schematic layout of the heat exchange member of the present invention in a circular cross-section heater.

Fig. 7 is a remote control flow diagram.

In the figure: 1. tube group, left tube group 11,

right tube group

12, 21, left tube, 22, right tube, 3, free end, 4, free end, 5, free end, 6, free end, 7, annular tube, 8, central tube, 91-93, heat source, 10 first tube orifice, 13 second tube orifice, left return tube 14, right return tube 15, front tube plate 16, support 17, support 18, rear tube plate 19,

shell

20, 21, shell inlet connecting tube, 22, shell outlet connecting tube, heat exchange component 23

Detailed Description

A shell-and-tube heat exchanger, as shown in fig. 1, comprises a shell 20, a heat exchange component 23, a shell-side inlet connecting pipe 21 and a shell-side outlet connecting pipe 22; the heat exchange component 23 is arranged in the shell 20 and fixedly connected to the front tube plate 16 and the rear tube plate 19; the shell side inlet connecting pipe 21 and the shell side outlet connecting pipe 22 are both arranged on the shell 20; fluid enters from the shell side inlet connecting pipe 21, exchanges heat through the heat exchange part and exits from the shell side outlet connecting pipe 22.

Preferably, the heat exchange member extends in a horizontal direction. The heat exchanger is arranged in the horizontal direction.

Fig. 2 shows a top view of a heat exchange unit 23, which, as shown in fig. 2, comprises a central tube 8, a left tube 21, a right tube 22 and a tube bank 1, the tube set 1 comprises a left tube set 11 and a right tube set 12, the left tube set 11 being in communication with a left side tube 21 and a central tube 8, the right tube set 12 being in communication with a right side tube 22 and the central tube 8, so that the central tube 8, the left side tube 21, the right side tube 22 and the tube group 1 form a closed circulation of heating fluid, the left side tube 21 and/or the central tube 8 and/or the right side tube 22 are filled with phase-change fluid, the left side tube 21, the central tube 8 and the right side tube 22 are respectively provided with a first heat source 91, a second heat source 92 and a third heat source 93, each tube group 1 comprises a plurality of circular arc-shaped annular tubes 7, the end parts of the adjacent annular tubes 7 are communicated, the plurality of annular tubes 7 form a serial structure, and the end parts of the annular tubes 7 form free ends 3-6 of the annular tubes; the central tube comprises a first tube orifice 10 and a second tube orifice 13, the first tube orifice 10 is connected with the inlet of the left tube group 11, the second tube orifice 13 is connected with the inlet of the right tube group 12, the outlet of the left tube group 11 is connected with the left tube 21, and the outlet of the right tube group 12 is connected with the right tube 22; the first orifice 10 and the second orifice 13 are arranged on the same side of the central tube 8. The left tube group and the right tube group are in mirror symmetry along the plane of the axis of the central tube.

The end portions of both ends of the center tube 8, the left tube 21, and the right tube 22 are disposed in the openings of the front and rear tube plates 16, 19 for fixation. The first orifice 10 and the second orifice 13 are located on the upper side of the central tube 8.

Preferably, a left return pipe 14 is arranged between the left pipe 21 and the central pipe 8, and a right return pipe 14 is arranged between the right pipe 22 and the central pipe 8. Preferably, the return pipe is arranged at the end of the central pipe. Both ends of the central tube are preferred.

Preferably, the fluid is a phase-change fluid, a vapor-liquid phase-change fluid, the first heat source 91, the second heat source 92 and the third heat source 93 are in data connection with a controller, and the controller controls the first heat source 91, the second heat source 92 and the third heat source 93 to heat.

The fluid is heated and evaporated in the central tube 8, flows to the left and

right headers

21 and 22 along the annular tube bundle, and is heated to expand in volume, so that steam is formed, and the volume of the steam is far larger than that of water, so that the formed steam can flow in the coil in a rapid impact manner. Because of volume expansion and steam flow, the free end of the annular tube can be induced to vibrate, the vibration is transmitted to the surrounding heat exchange fluid by the free end of the heat exchange tube in the vibration process, and the fluid can also generate disturbance, so that the surrounding heat exchange fluid forms disturbance flow, a boundary layer is damaged, and the purpose of enhancing heat transfer is realized. The fluid is condensed and released heat in the left and right side pipes and then flows back to the central pipe through the return pipe. Conversely, the fluid may be heated in the left and right pipes, condensed in the central pipe, and returned to the left and right pipes through the return pipe to be circulated.

According to the invention, the prior art is improved, and the condensation collecting pipe and the pipe groups are respectively arranged into two pipes which are distributed on the left side and the right side, so that the pipe groups distributed on the left side and the right side can perform vibration heat exchange descaling, the heat exchange vibration area is enlarged, the vibration can be more uniform, the heat exchange effect is more uniform, the heat exchange area is increased, and the heat exchange and descaling effects are enhanced.

The 3 heat sources are alternately heated in a period, and the periodic frequent vibration of the elastic coil can be realized, so that good descaling and heating effects are realized, and the heating power is basically the same in time.

Preferably, the annular tubes of the left tube group are distributed by taking the axis of the left tube as the center of a circle, and the annular tubes of the right tube group are distributed by taking the axis of the right tube as the center of a circle. The left side pipe and the right side pipe are arranged as circle centers, so that the distribution of the annular pipes can be better ensured, and the vibration and the heating are uniform.

Preferably, the tube group is plural.

Preferably, the center tube 8, the left tube 21, and the right tube 22 are provided along the longitudinal direction.

Preferably, the left tube group 21 and the right tube group 22 are staggered in the longitudinal direction, as shown in fig. 3. Through the staggered distribution, can make to vibrate heat transfer and scale removal on different length for the vibration is more even, strengthens heat transfer and scale removal effect.

Preferably, the tube group 2 is provided in plural (for example, the same side (left side or right side)) along the length direction of the center tube 8, and the tube diameter of the tube group 2 (for example, the same side (left side or right side)) becomes larger along the flow direction of the fluid in the shell side.

Preferably, the pipe diameter of the annular pipe of the pipe group (for example, the same side (left side or right side)) is increased along the flowing direction of the fluid in the shell side.

The pipe diameter range through the heat exchange tube increases, can guarantee that shell side fluid outlet position fully carries out the heat transfer, forms the heat transfer effect like the adverse current, further strengthens the heat transfer effect moreover for whole vibration effect is even, and the heat transfer effect increases, further improves heat transfer effect and scale removal effect. Experiments show that better heat exchange effect and descaling effect can be achieved by adopting the structural design.

Preferably, the tube group on the same side (left side or right side) is provided in plural along the length direction of the center tube 8, and the distance between the adjacent tube groups on the same side (left side or right side) becomes smaller along the flow direction of the fluid in the shell side.

Preferably, the spacing between the tube banks on the same side (left or right) in the direction of fluid flow in the shell side is increased by a decreasing amount.

The interval amplitude through the heat exchange tube increases, can guarantee that shell side fluid outlet position fully carries out the heat transfer, forms the heat transfer effect like the adverse current, further strengthens the heat transfer effect moreover for the whole vibration effect is even, and the heat transfer effect increases, further improves heat transfer effect and scale removal effect. Experiments show that better heat exchange effect and descaling effect can be achieved by adopting the structural design.

In tests it was found that the pipe diameters, distances and pipe diameters of the left side pipe 21, the right side pipe 22, the central pipe 8 and the pipe diameters of the ring pipes can have an influence on the heat exchange efficiency and the uniformity. If the distance between the collector is too big, then heat exchange efficiency is too poor, and the distance between the ring shape pipe is too little, then the ring shape pipe distributes too closely, also can influence heat exchange efficiency, and the pipe diameter size of collector and heat exchange tube influences the volume of the liquid or the steam that holds, then can exert an influence to the vibration of free end to influence the heat transfer. Therefore, the pipe diameters and distances of the left pipe 21, the right pipe 22, the central pipe 8 and the pipe diameters of the ring pipes have a certain relationship.

The invention provides an optimal size relation summarized by numerical simulation and test data of a plurality of heat pipes with different sizes. Starting from the maximum heat exchange quantity in the heat exchange effect, nearly 200 forms are calculated. The dimensional relationship is as follows:

the distance between the center of the central tube 8 and the center of the left tube 21 is equal to the distance between the center of the central tube 8 and the center of the right tube 21, L, the tube diameter of the left tube 21, the tube diameter of the central tube 8, and the radius of the right tube 22 are R, the radius of the axis of the innermost annular tube in the annular tubes is R1, and the radius of the axis of the outermost annular tube is R2, so that the following requirements are met:

R1/R2 ═ a × Ln (R/L) + b; where a, b are parameters and Ln is a logarithmic function, where 0.6212< a <0.6216, 1.300< b < 1.301; preferably, a is 0.6214 and b is 1.3005.

Preferably, 35< R <61 mm; 114< L <190 mm; 69< R1<121mm, 119< R2<201 mm.

Preferably, the number of annular tubes of the tube set is 3-5, preferably 3 or 4.

Preferably, 0.55< R1/R2< 0.62; 0.3< R/L < 0.33.

Preferably, 0.583< R1/R2< 0.615; 0.315< R/L < 0.332.

Preferably, the radius of the annular tube is preferably 10-40 mm; preferably 15 to 35mm, more preferably 20 to 30 mm.

Preferably, the centers of the left tube 21, the right tube 22 and the center tube 8 are on a straight line.

Preferably, the arc between the ends of the free ends 3, 4 around the centre axis of the left tube is 95-130 degrees, preferably 120 degrees. In the same way the free ends 5, 6 and the free ends 3, 4 have the same curvature. Through the design of the preferable included angle, the vibration of the free end is optimal, and therefore the heating efficiency is optimal.

Preferably, the heat exchange component can be used as an immersed heat exchange assembly, immersed in a fluid to heat the fluid, for example, the heat exchange component can be used as an air radiator heating assembly, and can also be used as a water heater heating assembly.

The heating power of the first, second and third heat sources is preferably 1000-.

Preferably, the box body has a circular cross section, and is provided with a plurality of heat exchange components, wherein one heat exchange component is arranged at the center of the circular cross section (the center pipe is arranged at the center of the circle) and the other heat exchange components are distributed around the center of the circular cross section.

Preferably, the tube bundle of the tube bank 1 is an elastic tube bundle.

The heat exchange coefficient can be further improved by arranging the tube bundle of the tube group 1 with an elastic tube bundle.

Further preferably, the heat source is an electric heating rod.

The number of the pipe groups 1 is multiple, and the plurality of pipe groups 1 are in a parallel structure.

The heat exchanger shown in fig. 6 has a circular cross-sectional housing in which the plurality of heat exchange members are disposed. Preferably, the number of the heat exchange components is three, the center of the central tube of each heat exchange component is located at the midpoint of an inscribed regular triangle of the circular cross section, the connecting lines of the centers of the central tubes form the regular triangle, one heat exchange component is arranged at the upper part of each central tube, two heat exchange components are arranged at the lower part of each central tube, and the connecting lines formed by the left side tube, the right side tube and the centers of the central tubes of the heat exchange components are of a parallel structure. Through such setting, can make and to fully reach vibrations and heat transfer purpose in can making the heater, improve the heat transfer effect.

Learn through numerical simulation and experiment, heat transfer part's size and circular cross section's diameter have very big influence to the heat transfer effect, heat transfer part oversize can lead to adjacent interval too little, the space that the centre formed is too big, the middle heating effect is not good, the heating is inhomogeneous, on the same way, heat transfer part size undersize can lead to adjacent interval too big, leads to the whole heating effect not good. Therefore, the invention obtains the optimal size relation through a large amount of numerical simulation and experimental research.

The distance between the centers of the left side pipe and the right side pipe is L1, the side length of the inscribed regular triangle is L2, the radius of the axis of the innermost annular pipe in the annular pipes is R1, and the radius of the axis of the outermost annular pipe is R2, so that the following requirements are met:

10*(L1/L2)＝d*(10*R1/R2)-e*(10*R1/R2)²-f; wherein d, e, f are parameters,

44.102<d<44.110,3.715<e<3.782,127.385<f<127.395；

more preferably, d is 44.107, e is 3.718, f is 127.39;

with 720< L2<1130mm preferred. Preferably 0.58< R1/R2< 0.62.

Further preferred is 0.30< L1/L2< 0.4.

Through the layout of the three heat exchange component structure optimization, the whole heat exchange effect can reach the best heat exchange effect.

It has been found in research and practice that a constant and stable heat source results in a fluid-forming stability of the internal heat exchange components, i.e. the fluid is not flowing or is flowing very little, or the flow is stable, resulting in a strongly reduced vibration performance of the line set 1, which affects the efficiency of the descaling and heating of the line set 1. Therefore, the heat pipe described above needs to be improved as follows.

In the prior application of the inventor, a periodic heat exchange mode is provided, and the vibration of the annular tube is continuously promoted through the periodic heat exchange mode, so that the heat exchange efficiency and the descaling effect are improved. However, adjusting the vibration of the tube bundle with a fixed periodic variation can lead to hysteresis and too long or too short a period. Therefore, the invention improves the previous application and intelligently controls the vibration, so that the fluid in the fluid can realize frequent vibration, and good descaling and heat exchange effects are realized.

Aiming at the defects in the technology researched in the prior art, the invention provides a novel heat exchanger capable of intelligently controlling vibration. The heat exchanger can improve the heat exchange efficiency, thereby realizing good descaling and heat exchange effects.

Automatically adjusting vibration based on pressure difference

Preferably, the left side pipe 21, the center pipe 8 and the right side pipe 22 are respectively provided with a first pressure sensor, a second pressure sensor and a third pressure sensor for detecting pressures in the left side pipe, the center pipe and the right side pipe, the first pressure sensor, the second pressure sensor and the third pressure sensor are in data connection with the controller, the controller extracts pressure data of the left pipe box, the right pipe box and the center pipe box according to a time sequence, pressure difference or pressure difference change accumulation is obtained through comparison of pressure data of adjacent time periods, the controller is connected with the cloud server, the cloud server is connected with the client, the controller transmits the pressure difference or pressure difference change accumulation to the cloud server and then transmits the pressure difference or pressure difference change accumulation to the client through the cloud server, the client is a mobile phone, the mobile phone is provided with an APP program, and a user can select an automatic control or manual control working mode at the client, the controller controls whether the first and

third heat sources

91 and 93 and the second heat source 92 are heated according to the operation mode selected by the user.

Preferably, in the manual control operation mode, a user obtains accumulated data of the pressure difference or the pressure difference change according to the client, manually inputs a control signal at the client, and then transmits the control signal to the central controller through the cloud server, and the central controller controls whether the first and

third heat sources

91 and 93 and the second heat source 92 are heated according to the signal input by the client.

In the automatic control mode, preferably, the controller controls whether or not the first and

third heat sources

91 and 93 and the second heat source 92 heat when the pressure difference or the cumulative total of changes in the pressure difference is lower than a threshold value.

According to the invention, through the mobile phone APP client, the controller realizes automatic control of the heat source through pressure difference, so that energy is saved, the best efficiency is achieved, the intellectualization of the heat exchange system is improved, and the remote portable monitoring is realized.

Through the pressure difference of the previous and subsequent time periods or the accumulated pressure difference detected by the pressure sensing element, the evaporation of the fluid inside can be judged to be basically saturated through the pressure difference, and the volume of the fluid inside is basically not changed greatly. So that the fluid undergoes volume reduction to thereby realize vibration. When the pressure difference is reduced to a certain degree, the internal fluid starts to enter a stable state again, and at the moment, the fluid needs to be heated so as to be evaporated and expanded again, so that the electric heater needs to be started for heating.

The stable state of the fluid is judged according to the pressure difference or the accumulation of the pressure difference change, so that the result is more accurate, and the problem of error increase caused by aging due to the running time problem is solved.

In the automatic control mode, preferably, when the first and third heat sources perform heating and the second heat source does not perform heating, if an average pressure of the left or right or left and right channel of the previous time period is P1 and an average pressure of the left or right or left and right channel of the adjacent subsequent time period is P2, if a difference between P2 and P1 is less than a threshold value, the controller controls the first and third heat sources to stop heating and the second heat source to perform heating.

Preferably, when the second heat source performs heating and the first third heat source does not perform heating, if the average pressure of the middle tube box in the previous period is P1 and the average pressure of the middle tube box in the next period is P2, the controller controls the first third heat source to perform heating and the second heat source to stop heating if the difference between P2 and P1 is lower than a threshold value.

The operation state of the heat source is determined according to different conditions through the difference of the heating pressure of different heaters.

Preferably, when the first and third heat sources perform heating and the second heat source does not perform heating, if the average pressure of the left or right or left and right channel in the previous time period is P1 and the average pressure of the left or right or left and right channel in the next time period is P2, if P1 is P2, the heating is determined according to the following conditions:

if the P1 is larger than the pressure of the first data, the controller controls the first and third heat sources to stop heating, and the second heat source to heat; wherein the first data is greater than the pressure of the phase change fluid after the phase change; preferably the first data is a pressure at which the phase change fluid is substantially phase-changed;

if P1 is less than or equal to the pressure of the second data, the controller controls the first and third heat sources to continue heating, and the second heat source to stop heating, wherein the second data is less than or equal to the pressure at which the phase change fluid does not change phase.

The first data is pressure data in a fully heated state, and the second data is pressure data in the absence of heating or in the beginning of heating. The judgment of the pressure is also used for determining whether the current heat source is in a heating state or a non-heating state, so that the operation state of the heat source is determined according to different conditions.

Preferably, when the second heat source performs heating and the first third heat source does not perform heating, if the pressure of the middle tube box in the previous period is P1 and the pressure of the middle tube box in the adjacent subsequent period is P2, if P1 is P2, the heating is judged according to the following conditions:

if the P1 is larger than the pressure of the first data, the controller controls the second heat source to stop heating, and the first third heat source to heat; wherein the first data is greater than the pressure of the phase change fluid after the phase change; preferably the first data is a pressure at which the phase change fluid is substantially phase-changed;

if P1 is less than or equal to the pressure of the second data, the controller controls the second heat source to continue heating, and the first and third heat sources continue to stop heating, wherein the second data is less than or equal to the pressure at which the phase change fluid does not change phase.

Preferably, each channel is provided with n pressure sensing elements, and the pressure P in the current time period is calculated sequentially_iPressure Q of the preceding period_i-1Difference D of_i＝P_i-Q_i-1And for n pressure differences D_iPerforming arithmetic cumulative summation

When the value of Y is lower than a set threshold value, the controller controls the first heat source, the second heat source and the third heat source to stop heating or continue heating.

Preferably, when the first and third heat sources perform heating and the second heat source does not perform heating, the controller controls the first and third heat sources to stop heating and the controller controls the second heat source to perform heating when the threshold value is lower.

Preferably, when the first and third heat sources stop heating and the second heat source performs heating, the controller controls the first and third heat sources to perform heating and the controller controls the second heat source to stop heating when the threshold value is lower.

Preferably, if Y is 0, heating is judged according to the following:

when the first and third heat sources are heating and the second heat source is not heating, or when the first and third heat sources stop heating and the second heat source is heating:

if P is_iIf the arithmetic mean of the first data is larger than the pressure of the first data, the controller controls the heating heat source to stop heating and the non-heating heat source to heat when the arithmetic mean of the first data is lower than the pressure of the first data; wherein the first data is greater than the pressure of the phase change fluid after the phase change; preferably the pressure at which the phase change fluid substantially changes phase;

if P is_iIs less than the pressure of the second data, the controller controls the heating source to continue heating below the threshold value, wherein the second data is less than or equal to the pressure at which no phase change of the phase-change fluid occurs.

Preferably, the period of time during which the pressure is measured is 1 to 10 minutes, preferably 3 to 6 minutes, and further preferably 4 minutes.

Preferably, the threshold is 100-1000 pa, preferably 500 pa.

Preferably, the pressure value may be an average pressure value over a period of the time period. The pressure at a certain moment in time may also be used. For example, preferably both are pressures at the end of the time period.

Independently adjusting vibration based on temperature

Preferably, a first temperature sensor, a second temperature sensor and a third temperature sensor are respectively arranged in the left side tube 21, the central tube 8 and the right side tube 22 and used for detecting the temperature in the left side tube, the central tube and the right side tube, the first temperature sensor, the second temperature sensor and the third temperature sensor are in data connection with a controller, the controller extracts the temperature data of the left tube box, the right tube box and the central tube box according to a time sequence, the temperature difference or the accumulation of the temperature difference change is obtained through the comparison of the temperature data of adjacent time periods, the controller is connected with a cloud server, the cloud server is connected with a client, the controller transmits the temperature difference or the accumulation of the temperature difference change to the cloud server and then transmits the temperature difference or the temperature difference change to the client through the cloud server, the client is a mobile phone, the mobile phone is provided with an APP program, and a user can select an automatic control or manual control working mode at the client, the controller controls whether the first and third heat sources 91 and 93 and the second heat source 92 are heated according to the operation mode selected by the user.

Preferably, in the manual control mode, the user obtains the temperature difference or the accumulated data of the temperature difference change according to the client, manually inputs a control signal at the client, and then transmits the control signal to the central controller through the cloud server, and the central controller controls whether the first and

third heat sources

91 and 93 and the second heat source 92 heat when the temperature difference or the cumulative total of changes in the temperature difference is lower than a threshold value.

According to the invention, through the mobile phone APP client, the controller realizes automatic control of the heat source through the temperature difference, so that energy is saved, the best efficiency is achieved, the intellectualization of the heat exchange system is improved, and the remote portable monitoring is realized.

The temperature difference or the accumulated temperature difference of the previous time period and the later time period detected by the temperature sensing element can be used for judging that the evaporation of the fluid inside is basically saturated and the volume of the fluid inside is not changed greatly. So that the fluid undergoes volume reduction to thereby realize vibration. When the temperature difference is reduced to a certain degree, the internal fluid starts to enter a stable state again, and the fluid needs to be heated to evaporate and expand again, so that a starting heat source needs to be used for heating.

The stable state of the fluid is judged according to the temperature difference or the accumulation of the temperature difference change, so that the result is more accurate, and the problem of error increase caused by aging due to the problem of operation time is solved.

In the automatic control mode, preferably, when the first and third heat sources perform heating and the second heat source does not perform heating, if an average temperature of the left or right or left and right tube boxes in a previous period is T1 and an average temperature of the left or right or left and right tube boxes in an adjacent subsequent period is T2, if a difference between T2 and T1 is less than a threshold, the controller controls the first and third heat sources to stop heating and the second heat source to perform heating.

Preferably, when the second heat source performs heating and the first third heat source does not perform heating, if the average temperature of the middle tube box in the previous period is T1 and the average temperature of the middle tube box in the next period is T2, the controller controls the first third heat source to perform heating and the second heat source to stop heating if the difference between T2 and T1 is lower than a threshold value.

The operation state of the heat source is determined according to different conditions through the difference of the heating temperatures of different heaters.

Preferably, when the first and third heat sources perform heating and the second heat source does not perform heating, if the average temperature of the left or right or left and right tube boxes in the previous time period is T1 and the average temperature of the left or right or left and right tube boxes in the next time period is T2, if T1 is T2, the heating is determined according to the following conditions:

if the T1 is greater than the temperature of the first data, the controller controls the first and third heat sources to stop heating, and the second heat source to heat; wherein the first data is greater than the temperature of the phase change fluid after the phase change; preferably the first data is a temperature at which the phase change fluid substantially changes phase;

if T1 is less than or equal to the temperature of the second data, the controller controls the first and third heat sources to continue heating and the second heat source to stop heating, wherein the second data is less than or equal to the temperature at which the phase change fluid does not change phase.

The first data is temperature data in a fully heated state, and the second data is temperature data in which heating is not performed or heating is started. By the above judgment of the temperature, whether the current heat source is in the heating state or the non-heating state is determined, and the operation state of the heat source is determined according to different situations.

Preferably, when the second heat source performs heating and the first third heat source does not perform heating, if the temperature of the middle tube box in the previous period is T1 and the temperature of the middle tube box in the adjacent subsequent period is T2, if T1 is T2, the heating is judged according to the following conditions:

if the T1 is greater than the temperature of the first data, the controller controls the second heat source to stop heating, and controls the first third heat source to heat; wherein the first data is greater than the temperature of the phase change fluid after the phase change; preferably the first data is a temperature at which the phase change fluid substantially changes phase;

if the temperature of T1 is less than or equal to the temperature of the second data, the controller controls the second heat source to continue heating, and the first and third heat sources continue heating, wherein the temperature of the second data is less than or equal to the temperature at which the phase change fluid does not change phase.

Preferably, each channel is provided with n temperature sensing elements, and the temperature of the current time period is calculated in sequenceP_iTemperature Q of the preceding time period_i-1Difference D of_i＝P_i-Q_i-1And for n temperature differences D_iPerforming arithmetic cumulative summation

Preferably, if Y is 0, heating is judged according to the following:

if P is_iIf the arithmetic mean of the first data is higher than the temperature of the first data, the controller controls the heating heat source to stop heating and the non-heating heat source to heat when the arithmetic mean of the first data is lower than the temperature of the first data; wherein the first data is greater than the temperature of the phase change fluid after the phase change; preferably the temperature at which the phase change fluid substantially changes phase;

if P is_iIs less than a second data temperature, the controller controls the heated heat source to continue heating below a threshold value, wherein the second data is less than or equal to the temperature at which no phase change of the phase change fluid occurs.

The first data is temperature data of a sufficiently heated state, and the second data is temperature data of no heating or temperature data of the beginning of heating. By the above judgment of the temperature, whether the current heat source is in the heating state or the non-heating state is determined, and the operation state of the heat source is determined according to different situations.

Preferably, the period of time for measuring the temperature is 1 to 10 minutes, preferably 3 to 6 minutes, and further preferably 4 minutes.

Preferably, the temperature value may be an average temperature value over a period of the time period. The temperature at a certain moment in time may also be used. For example, preferably both are temperatures at the end of the time period.

Thirdly, automatically adjusting vibration based on liquid level

Preferably, a first liquid level sensor, a second liquid level sensor and a third liquid level sensor are respectively arranged in the left side pipe 21, the central pipe 8 and the right side pipe 22 and used for detecting liquid levels in the left side pipe, the right side pipe and the central pipe, the first liquid level sensor, the second liquid level sensor and the third liquid level sensor are in data connection with a controller, the controller extracts liquid level data of the left pipe box, the right pipe box and the central pipe box according to a time sequence, liquid level difference or accumulation of liquid level difference change is obtained through comparison of the liquid level data of adjacent time periods, the controller is connected with a cloud server, the cloud server is connected with a client, the controller transmits the liquid level difference or accumulation of liquid level difference change to the cloud server and then transmits the liquid level difference or accumulation of liquid level difference change to the client through the cloud server, the client is a mobile phone, the mobile phone is provided with an APP program, and a user can select an automatic control or manual control working mode at the client, the controller controls whether the first and third heat sources 91 and 93 and the second heat source 92 are heated according to the operation mode selected by the user.

Preferably, in the manual control mode, the user obtains the accumulated data of the liquid level difference or the change of the liquid level difference according to the client, manually inputs a control signal at the client, and then transmits the control signal to the central controller through the cloud server, and the central controller controls whether the first and

third heat sources

91 and 93 and the second heat source 92 heat when the liquid level difference or the accumulation of changes in the liquid level difference is lower than a threshold value.

According to the invention, through the mobile phone APP client, the controller realizes automatic control of the heat source through the liquid level difference, so that energy is saved, the best efficiency is achieved, the intellectualization of the heat exchange system is improved, and the remote portable monitoring is realized.

Through the liquid level difference or the accumulated liquid level difference of the front time period and the rear time period detected by the liquid level sensing element, the evaporation of the fluid inside can be judged to be basically saturated through the liquid level difference, and the volume of the fluid inside is basically not changed greatly. So that the fluid undergoes volume reduction to thereby realize vibration. When the liquid level difference is reduced to a certain degree, the internal fluid starts to enter a stable state again, and at the moment, the fluid needs to be heated so as to be evaporated and expanded again, so that a starting heat source needs to be used for heating.

The stable state of the fluid is judged according to the liquid level difference or the accumulation of the change of the liquid level difference, so that the result is more accurate, and the problem of error increase caused by aging due to the problem of operation time is solved.

In the automatic control mode, preferably, when the first and third heat sources perform heating and the second heat source does not perform heating, if the average liquid level of the left or right or left and right channel in the previous period is L1, the average liquid level of the left or right or left and right channel in the next period is L2, and if the difference between L1 and L2 is lower than a threshold, the controller controls the first and third heat sources to stop heating and the second heat source to perform heating.

Preferably, when the second heat source performs heating and the first and third heat sources do not perform heating, if the average liquid level of the middle tube box in the previous period is L1 and the average liquid level of the middle tube box in the next subsequent period is L2, the controller controls the first and third heat sources to perform heating and the second heat source to stop heating if the difference between L1 and L2 is lower than a threshold value.

The operation state of the heat source is determined according to different conditions through the difference value of the liquid levels heated by different heaters.

Preferably, when the first and third heat sources perform heating and the second heat source does not perform heating, if the average liquid level of the left or right or left and right channel in the previous time period is L1, and the average liquid level of the left or right or left and right channel in the next time period is L2, if L1 is T2, the heating is determined according to the following conditions:

if the L1 is less than the liquid level of the first data, the controller controls the first third heat source to stop heating, and the second heat source to heat; wherein the first data is less than or equal to the liquid level of the phase-change fluid after the phase change; preferably the first data is a level at which the phase change fluid is substantially phase changed;

if T1 is greater than or equal to a level at which the phase change fluid does not change phase, the controller controls the first and third heat sources to continue heating and the second heat source to stop heating.

The first data is liquid level data in a fully heated state, and the second data is liquid level data in the state of no heating or the beginning of heating. Through the judgment of the liquid level, whether the current heat source is in a heating state or a non-heating state is also determined, so that the operation state of the heat source is determined according to different conditions.

Preferably, when the second heat source performs heating and the first third heat source does not perform heating, if the liquid level of the middle tube box in the previous period is L1 and the liquid level of the middle tube box in the adjacent subsequent period is L2, if L1 is L2, the heating is judged according to the following conditions:

if the L1 is less than the liquid level of the first data, the controller controls the second heat source to stop heating, and the first third heat source to heat; wherein the first data is equal to or less than the liquid level of the phase-change fluid after the phase change; preferably the first data is a level at which the phase change fluid is substantially phase changed;

and if the L1 is less than or equal to the liquid level of the second data, the controller controls the second heat source to continue heating, and the first and third heat sources continue heating, wherein the second data is equal to the liquid level at which the phase-change fluid does not change phase.

Preferably, each channel is provided with n liquid level sensing elements, and the liquid level P in the current time period is calculated in sequence_iAnd the liquid level Q of the previous time period_i-1Difference D of_i＝P_i-Q_i-1And for n liquid level differences D_iPerforming arithmetic cumulative summation

Preferably, if Y is 0, heating is judged according to the following:

if P is_iIf the arithmetic mean of the first data is less than or equal to the liquid level of the first data, the controller controls the heating heat source to stop heating and the non-heating heat source to heat when the arithmetic mean of the first data is less than or equal to the liquid level of the first data; wherein the first data is greater than the liquid level of the phase-change fluid after the phase change; superior foodSelecting the liquid level of the phase-change fluid with sufficient phase change;

if P is_iIs greater than the level of the second data, and is less than the threshold value, the controller controls the heating source to continue heating, wherein the second data is less than or equal to the level at which the phase change fluid does not undergo a phase change.

The first data is liquid level data in a fully heated state, and the second data is liquid level data without heating or at the beginning of heating. Through the judgment of the liquid level, whether the current heat source is in a heating state or a non-heating state is also determined, so that the operation state of the heat source is determined according to different conditions.

Preferably, the period of time for measuring the liquid level is 1 to 10 minutes, preferably 3 to 6 minutes, and further preferably 4 minutes.

Preferably, when the first and third heat sources heat and the second heat source does not heat, and when the liquid level detected by the first or third liquid level sensing element is lower than a certain value, or the average value of the liquid levels detected by the first and third liquid level sensing elements is lower than a certain value, the controller controls the first and third heat sources to stop heating and the second heat source to heat; when the first heat source and the third heat source stop heating and the second heat source heats, and when the liquid level detected by the second liquid level sensing element is lower than a certain value, the controller controls the first heat source and the third heat source to heat, and the second heat source stops heating.

Through the liquid level that liquid level perception element detected, can satisfy under certain liquid level condition, the evaporation of the inside fluid of left side pipe, right side pipe or center tube has reached saturation basically, and the volume of inside fluid also changes little basically, and under this kind of condition, inside fluid is relatively stable, and the tube bank vibratility variation at this moment is consequently poor, consequently need adjust, changes heat exchange component, makes the fluid flow towards different directions. Therefore, a new heat source is started to perform alternate heat exchange by detecting the liquid level change in the left side pipe, the right side pipe and the central pipe, and the heat exchange effect and the descaling effect are improved.

Fourthly, automatically adjusting vibration based on speed

Preferably, the left tube group and/or the right tube group are internally provided with speed sensing elements for detecting the flow speed of the fluid in the free end of the tube bundle, the speed sensing element is in data connection with the controller, the controller extracts flow speed data according to a time sequence, the flow rate difference or the accumulation of the flow rate difference change is obtained by comparing the flow rate data of adjacent time periods, the controller is connected with a cloud server, the cloud server is connected with a client, wherein the controller transmits the speed difference or the accumulation of the speed difference change to the cloud server, and then transmits the speed difference or the accumulation of the speed difference change to the client through the cloud server, the client is a mobile phone, the mobile phone is provided with an APP program, a user can select an automatic control working mode or a manual control working mode at the client, and the controller controls whether the first heat source 91, the third heat source 93 and the second heat source 92 are heated or not according to the working mode selected by the user.

Preferably, in the manual control mode, the user obtains the speed difference or the accumulated data of the speed difference change according to the client, manually inputs a control signal at the client, and then transmits the control signal to the central controller through the cloud server, and the central controller controls whether the first and

third heat sources

91 and 93 and the second heat source 92 heat when the speed difference or the cumulative sum of changes in the speed difference is lower than a threshold value.

According to the invention, through the mobile phone APP client, the controller realizes automatic control of the heat source through the speed difference, so that energy is saved, the best efficiency is achieved, the intellectualization of the heat exchange system is improved, and the remote portable monitoring is realized. The flow velocity difference or the cumulative flow velocity difference of the previous and subsequent time periods detected by the flow velocity sensing element can be used for judging that the evaporation of the fluid inside is basically saturated and the volume of the fluid inside is not changed greatly. So that the fluid undergoes volume reduction to thereby realize vibration. When the flow rate difference is reduced to a certain extent, the internal fluid starts to enter a steady state again, and heating is needed to evaporate and expand the fluid again, so that a starting heat source is needed for heating.

The steady state of the fluid is judged according to the flow rate difference or the accumulation of the flow rate difference change, so that the result is more accurate, and the problem of error increase caused by aging due to the operation time problem is solved.

In the automatic control mode, preferably, when the first and third heat sources perform heating and the second heat source does not perform heating, if the flow rate in the previous time period is V1 and the flow rate in the next subsequent time period is V2, the controller controls the first and third heat sources to stop heating and the second heat source to perform heating if the difference between V2 and V1 is lower than a threshold value.

Preferably, when the second heat source performs heating and the first and third heat sources do not perform heating, if the flow rate in the previous time period is V1 and the flow rate in the next subsequent time period is V2, the controller controls the first and third heat sources to perform heating and the second heat source to stop heating if the difference between V2 and V1 is lower than a threshold value.

The operation state of the heat source is determined according to different conditions through the difference of the flow rates heated by different heaters.

Preferably, when the first and third heat sources perform heating and the second heat source does not perform heating, if the flow rate in the preceding time period is V1 and the flow rate in the adjacent following time period is V2, if V1 is V2, the heating is judged according to the following conditions:

if V1 is greater than the flow rate of the first data, the controller controls the first and third heat sources to stop heating, and the second heat source to perform heating; wherein the first data is greater than or equal to the flow rate of the phase-change fluid after the phase change; preferably the first data is a flow rate at which the phase change fluid is substantially phase-changed;

if V1 is less than or equal to the flow rate of the second data, the controller controls the first and third heat sources to continue heating and the second heat source to stop heating, wherein the second data is equal to the flow rate at which the phase change fluid does not undergo a phase change.

The first data is flow rate data in a fully heated state, and the second data is flow rate data in the absence of heating or in the beginning of heating. The judgment of the flow speed also determines whether the current heat source is in a heating state or a non-heating state, so that the operation state of the heat source is determined according to different conditions.

Preferably, when the second heat source performs heating and the first third heat source does not perform heating, if the flow rate of the middle tube box in the previous period is V1 and the flow rate of the middle tube box in the adjacent subsequent period is V2, if V1 is V2, the heating is judged according to the following conditions:

if V1 is greater than the flow rate of the first data, the controller controls the second heat source to stop heating and controls the first third heat source to heat; wherein the first data is equal to or less than the flow rate of the phase-change fluid after the phase change; preferably the first data is a flow rate at which the phase change fluid is substantially phase-changed;

if V1 is greater than or equal to the flow rate of the second data, the controller controls the second heat source to continue heating and the first and third heat sources to stop heating, wherein the second data is equal to the flow rate at which the phase change fluid does not undergo a phase change.

Preferably, a plurality of flow velocity sensing elements are set to be n, and the flow velocity P in the current time period is calculated in sequence_iAnd the flow rate Q of the previous time period_i-1Difference D of_i＝P_i-Q_i-1And for n flow rate differences D_iPerforming arithmetic cumulative summation

Preferably, if Y is 0, heating is judged according to the following:

if P is_iIf the arithmetic mean of the first data is larger than the flow rate of the first data, the controller controls the heating heat source to stop heating and the non-heating heat source to heat when the flow rate of the first data is lower than a threshold value; wherein the first data is greater than the flow rate of the phase-change fluid after the phase change; preferably a flow rate at which the phase change fluid is substantially phase-changed;

if P is_iIs less than a second data flow rate at which no phase change of the phase change fluid occurs, the controller controls the heated heat source to continue heating below a threshold value.

Preferably, the period of time for measuring the flow rate is 1 to 10 minutes, preferably 3 to 6 minutes, and further preferably 4 minutes.

Preferably, the flow rate is an average flow rate of the left tube group and the right tube group.

Preferably, the speed sensing element is disposed at the free end. Through setting up at the free end, can perceive the speed change of free end to realize better control and regulation.

Preferably, the heat source is an electric heater.

Preferably, the axes of the left tube, the right tube and the middle tube are connected in a straight line or on a plane.

Preferably, the pipe diameters of the left side pipe and the right side pipe are smaller than the pipe diameter of the middle pipe. The pipe diameter of the middle pipe is preferably 1.4-1.5 times of the pipe diameter of the left side pipe and the right side pipe. Through the pipe diameter setting of left side pipe, right side pipe and intermediate pipe, can guarantee that the fluid carries out the phase transition and keeps the same or close transmission speed at left side pipe, right side pipe and intermediate pipe to guarantee the homogeneity of conducting heat.

Preferably, the connection position of the coil pipe at the left channel box is lower than the connection position of the middle channel box and the coil pipe. This ensures that steam can rapidly pass up into the central tube. Similarly, the connecting position of the coil pipe at the right channel box is lower than the connecting position of the middle channel box and the coil pipe

Although the present invention has been described with reference to the preferred embodiments, it is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A remote speed difference three-heat-source shell-and-tube heat exchanger comprises a shell, wherein tube plates are respectively arranged at two ends of the shell, a heat exchange component is arranged in the shell, the heat exchange component comprises a central tube, a left tube, a right tube and a tube group, the tube group comprises a left tube group and a right tube group, the left tube group is communicated with the left tube and the central tube, the right tube group is communicated with the right tube and the central tube, the central tube, the left tube, the central tube and the right tube are respectively provided with a first heat source, a second heat source and a third heat source, each tube group comprises a plurality of circular arc-shaped annular tubes, the end parts of the adjacent annular tubes are communicated, so that the plurality of annular tubes form a serial structure, and the end parts of the annular tubes form free ends of the annular tubes; the central tube comprises a first tube orifice and a second tube orifice, the first tube orifice is connected with the inlet of the left tube group, the second tube orifice is connected with the inlet of the right tube group, the outlet of the left tube group is connected with the left tube, and the outlet of the right tube group is connected with the right tube; the first pipe orifice and the second pipe orifice are arranged on the same side of the central pipe, and the left pipe group and the right pipe group are in mirror symmetry along the plane of the axis of the central pipe; a left return pipe is arranged between the left side pipe and the central pipe, and a right return pipe is arranged between the right side pipe and the central pipe; the system is characterized in that a speed sensing element is arranged in a free end of the tube bundle and used for detecting the flow velocity of fluid in the free end of the tube bundle, the speed sensing element is in data connection with a controller, the controller extracts flow velocity data according to a time sequence and obtains the flow velocity difference or the accumulation of the flow velocity difference change through the comparison of the flow velocity data of adjacent time periods, the controller is connected with a cloud server, the cloud server is connected with a client, the controller transmits the speed difference or the accumulation of the speed difference change to the cloud server and then transmits the speed difference or the accumulation of the speed difference change to the client through the cloud server, a user can select an automatic control or manual control working mode at the client, and the controller controls the working mode selected by the client to control whether the first heat source, the third heat source and the second heat source are heated or not; in the automatic control mode, when the speed difference or the accumulation of the speed difference changes is lower than a threshold value, the controller controls whether the first heat source, the third heat source and the second heat source heat or not.

2. The heat exchanger of claim 1, wherein in the manual control mode, a user obtains the accumulated data of the speed difference or the speed difference variation according to the client, inputs a control signal manually at the client, and then transmits the control signal to the central controller through the cloud server, and the central controller controls whether the first heat source, the third heat source and the second heat source are heated according to the signal input by the client.

3. The heat exchanger as claimed in claim 1, wherein in the automatic control mode, when the first and third heat sources perform heating and the second heat source does not perform heating, if the flow rate in the previous period is V1 and the flow rate in the next following period is V2, the controller controls the first and third heat sources to stop heating and the second heat source to perform heating if the difference between V2 and V1 is lower than a threshold value;