阅读说明：本技术 换热装置及其控制方法 (Heat exchange device and control method thereof ) 是由 李宇行 顾雯 章刚 张玮 李贺 于 2019-11-11 设计创作，主要内容包括：本发明提供一种换热装置及其控制方法,包括控制器和换热器,所述换热器包括入口、出口以及并联连接在所述入口和所述出口之间的多个换热通路,所述换热通路上设置有检测装置和电控阀,所述控制器分别与所述检测装置和所述电控阀电性连接；所述检测装置包括流量计,所述流量计用于检测所在换热通路内换热介质的流量,并在流量达到流量阈值时向所述控制器发送流量检测信号；所述控制器接收所述流量检测信号,并向其他的至少一个所述换热通路上的所述电控阀发送关闭信号,以通过所述电控阀关闭其他的至少一个所述换热通路；使换热介质以相对较快的流速通过打开状态的换热通路,实现在换热装置运行状态下清扫换热通路,减少检修或更换成本。(The invention provides a heat exchange device and a control method thereof, wherein the heat exchange device comprises a controller and a heat exchanger, the heat exchanger comprises an inlet, an outlet and a plurality of heat exchange passages connected in parallel between the inlet and the outlet, the heat exchange passages are provided with a detection device and an electric control valve, and the controller is respectively electrically connected with the detection device and the electric control valve; the detection device comprises a flowmeter, the flowmeter is used for detecting the flow of the heat exchange medium in the heat exchange passage and sending a flow detection signal to the controller when the flow reaches a flow threshold value; the controller receives the flow detection signal and sends a closing signal to the electronic control valve on at least one other heat exchange passage so as to close the at least one other heat exchange passage through the electronic control valve; the heat exchange medium passes through the heat exchange passage in an open state at a relatively high flow speed, so that the heat exchange passage is cleaned in the running state of the heat exchange device, and the overhaul or replacement cost is reduced.)

1. A heat exchange device is characterized by comprising a controller and a heat exchanger, wherein the heat exchanger comprises an inlet, an outlet and a plurality of heat exchange passages connected in parallel between the inlet and the outlet, the heat exchange passages are provided with a detection device and an electric control valve, and the controller is respectively electrically connected with the detection device and the electric control valve;

the detection device comprises a flowmeter, the flowmeter is used for detecting the flow of the heat exchange medium in the heat exchange passage and sending a flow detection signal to the controller when the flow reaches a flow threshold value;

the controller receives the flow detection signal and sends a closing signal to the electric control valve on at least one other heat exchange passage so as to close the at least one other heat exchange passage through the electric control valve.

2. The heat exchange device of claim 1, wherein the detection device further comprises a thermometer, and the thermometer is used for detecting the temperature of the heat exchange medium in the heat exchange passage and sending a temperature detection signal to the controller when the temperature reaches a temperature threshold value;

and when receiving the temperature detection signal and/or the flow detection signal, the controller sends a closing signal to the electric control valve on at least one other heat exchange passage.

3. The heat exchange device of claim 1, wherein the electrically controlled valve is a solenoid valve.

4. The heat exchange device of claim 1, wherein the controller is a PLC controller.

5. The control method of the heat exchange device is characterized in that the heat exchange device comprises a controller and a heat exchanger, the heat exchanger comprises an inlet, an outlet and a plurality of heat exchange passages connected in parallel between the inlet and the outlet, a detection device and an electric control valve are arranged on each heat exchange passage, the detection device comprises a flow meter, and the controller is electrically connected with the flow meter and the electric control valve respectively; the method comprises the following steps:

detecting the flow of the heat exchange medium in the heat exchange passage through the flowmeter, and sending a flow detection signal to the controller when the flow of the heat exchange medium in the heat exchange passage where the flowmeter is located reaches a flow threshold value;

the controller responds to the flow detection signal and sends a closing signal to the electronic control valve on the other at least one heat exchange passage so as to close the other at least one heat exchange passage through the electronic control valve.

6. The control method according to claim 5, wherein when the flow rate of the heat exchange medium in the heat exchange passage where the flowmeter is located reaches a flow rate threshold value, a flow rate detection signal is sent to the controller, specifically:

and when the deviation between the flow of the heat exchange medium in the heat exchange passage where the flowmeter is located and a preset flow value reaches a first deviation threshold value, sending a flow detection signal to the controller.

7. The control method according to claim 6, characterized in that the first deviation threshold value is 10% of the preset flow rate value.

8. The control method of claim 5, wherein the detection device further comprises a thermometer electrically connected to the controller, the method further comprising:

the temperature of the heat exchange medium in the heat exchange passage where the thermometer is located is detected through the thermometer, and when the temperature of the heat exchange medium in the heat exchange passage where the thermometer is located reaches a temperature threshold value, a temperature detection signal is sent to the controller;

the controller responds to the temperature detection signal and/or the flow detection signal and sends a closing signal to the electric control valve on the other at least one heat exchange passage so as to close the other at least one heat exchange passage through the electric control valve.

9. The control method according to claim 8, wherein when the temperature of the heat exchange medium in the heat exchange passage where the thermometer is located reaches a temperature threshold, a temperature detection signal is sent to the controller, specifically:

and when the deviation between the temperature of the heat exchange medium in the heat exchange passage where the thermometer is located and a preset temperature value reaches a second deviation threshold value, sending a temperature detection signal to the controller.

10. The control method according to claim 9, characterized in that the second deviation threshold value is 10% of the preset temperature value.

Technical Field

The invention belongs to the field of heat exchange devices, and particularly relates to a heat exchange device and a control method thereof.

Background

At present, a shell and tube heat exchanger is a relatively common heat exchange device, and a coal gasification device system can achieve the purpose of waste heat recovery through the shell and tube heat exchanger.

However, since most of the heat exchangers are metal tube heat exchangers, slag water with high temperature and high pressure flows through the tubes, and gas or liquid to be preheated flows through the tubes. Generally, the slag water contains ash and slag, and the resistance brought by the tubular heat exchanger deposits ash and even scales on the inner wall of the heat exchange tube of the tubular heat exchanger after long-time operation, so that the heat efficiency of the heat exchanger is greatly reduced.

Because the cleaning method of the tubular heat exchanger is very troublesome, the pressing cover of the tubular heat exchanger needs to be opened, and then each heating pipe is sprayed and cleaned by a high-pressure water gun. Therefore, the cleaning process of the tube type heat exchanger consumes a long time and large labor, and is a great waste of manpower resources; in addition, water can not be recycled in the process of spraying by the high-pressure water gun, and water resources are wasted.

Because the special tubular structure of the tubular heat exchanger is difficult to clean thoroughly, the influence of most enterprises and individuals on the scaling of the heat exchange equipment and the cleaning process are still in the aspects of the traditional 'destructive' processes and concepts such as machinery, high-pressure water, chemical pickling and the like; generally, equipment cleaning is considered only under the condition of seriously influencing production, so that the influence on energy consumption of an enterprise after scale generation is often ignored, and the profit of the enterprise is engulfed.

However, in order to reduce the cleaning costs, cleaning methods which are damaging and corrosive to the plant are selected, which results in plant scrap and production stoppage, for which a cost which is several times higher than that of cleaning agents is paid. For example, when oxalic acid is used for cleaning heat exchange equipment, the cleaning frequency is increased, the shutdown and production stop time is correspondingly increased, and the loss is indirectly caused to enterprises.

Disclosure of Invention

In view of the above problems in the prior art, the present invention provides a heat exchanger capable of automatically cleaning scales on a heat exchange passage and a control method of the heat exchanger.

In order to achieve the purpose, the embodiment of the invention adopts the technical scheme that:

a heat exchange device comprises a controller and a heat exchanger, wherein the heat exchanger comprises an inlet, an outlet and a plurality of heat exchange passages connected in parallel between the inlet and the outlet, a detection device and an electric control valve are arranged on each heat exchange passage, and the controller is respectively electrically connected with the detection device and the electric control valve;

the detection device comprises a flowmeter, the flowmeter is used for detecting the flow of the heat exchange medium in the heat exchange passage and sending a flow detection signal to the controller when the flow reaches a flow threshold value;

the controller receives the flow detection signal and sends a closing signal to the electric control valve on at least one other heat exchange passage so as to close the at least one other heat exchange passage through the electric control valve.

Optionally, the detection device further comprises a thermometer, and the thermometer is configured to detect a temperature of a heat exchange medium in the heat exchange passage where the thermometer is located, and send a temperature detection signal to the controller when the temperature reaches a temperature threshold;

and when receiving the temperature detection signal and/or the flow detection signal, the controller sends a closing signal to the electric control valve on at least one other heat exchange passage.

Optionally, the electrically controlled valve is a solenoid valve.

Optionally, the controller is a PLC controller.

On the other hand, the invention also provides a control method of the heat exchange device, wherein the heat exchange device comprises a controller and a heat exchanger, the heat exchanger comprises an inlet, an outlet and a plurality of heat exchange passages connected in parallel between the inlet and the outlet, the heat exchange passages are provided with a detection device and an electric control valve, the detection device comprises a flow meter, and the controller is respectively electrically connected with the flow meter and the electric control valve; the method comprises the following steps:

detecting the flow of the heat exchange medium in the heat exchange passage through the flowmeter, and sending a flow detection signal to the controller when the flow of the heat exchange medium in the heat exchange passage where the flowmeter is located reaches a flow threshold value;

the controller responds to the flow detection signal and sends a closing signal to the electronic control valve on the other at least one heat exchange passage so as to close the other at least one heat exchange passage through the electronic control valve.

Optionally, when the flow rate of the heat exchange medium in the heat exchange passage where the flow meter is located reaches a flow rate threshold, a flow rate detection signal is sent to the controller, specifically:

and when the deviation between the flow of the heat exchange medium in the heat exchange passage where the flowmeter is located and a preset flow value reaches a first deviation threshold value, sending a flow detection signal to the controller.

Optionally, the first deviation threshold is 10% of the preset flow value.

Optionally, the detection device further comprises a thermometer electrically connected to the controller, the method further comprising:

the temperature of the heat exchange medium in the heat exchange passage where the thermometer is located is detected through the thermometer, and when the temperature of the heat exchange medium in the heat exchange passage where the thermometer is located reaches a temperature threshold value, a temperature detection signal is sent to the controller;

the controller responds to the temperature detection signal and/or the flow detection signal and sends a closing signal to the electric control valve on the other at least one heat exchange passage so as to close the other at least one heat exchange passage through the electric control valve.

Optionally, when the temperature of the heat exchange medium in the heat exchange passage where the thermometer is located reaches a temperature threshold, a temperature detection signal is sent to the controller, specifically:

and when the deviation between the temperature of the heat exchange medium in the heat exchange passage where the thermometer is located and a preset temperature value reaches a second deviation threshold value, sending a temperature detection signal to the controller.

Optionally, the second deviation threshold is 10% of the preset temperature value.

Compared with the prior art, the invention has the beneficial effects that:

according to the heat exchange device provided by the embodiment of the invention, the flow of the heat exchange medium in the heat exchange passage is detected through the flowmeter, and a flow detection signal is sent to the controller when the flow reaches a flow threshold value, wherein the flow threshold value is used for representing that the heat exchange passage is likely to be scaled; the controller receives the flow detection signal and sends a closing signal to at least one of the other heat exchange passages through the electric control valve to close at least one of the other heat exchange passages, so that the heat exchange medium flowing through the plurality of heat exchange passages originally can only pass through one heat exchange passage in an open state at the moment, and therefore, due to the increase of hydraulic pressure of the heat exchange medium, the flow velocity of the heat exchange medium is inevitably increased greatly relative to the previous flow velocity, scale in the heat exchange passages can be effectively flushed, the cleaning purpose is achieved, the problem that the heat exchange efficiency is reduced due to scale formation of the heat exchange passages is avoided, the heat exchange device is enabled to maintain high heat exchange efficiency, the damage of the scale to the heat exchange passages is avoided, the service life of the heat exchange device is prolonged, and the overhaul or replacement cost is correspondingly reduced.

The heat exchange device of the embodiment of the invention realizes automatic control, and recyclable solid particles such as small balls and cleaning beads are not arranged in the heat exchange passage, so that the heat exchange device has a simpler structure and is more convenient to operate, and the labor intensity is effectively reduced.

Drawings

FIG. 1 is a schematic structural diagram of a heat exchange device according to an embodiment of the present invention;

fig. 2 is a flowchart of a control method of a heat exchange device according to an embodiment of the present invention.

Description of the reference numerals

1 inlet 2 heat exchange path 3 flowmeter

4 thermometer 5 electric control valve 6 controller 7 outlet

Detailed Description

The following detailed description of specific embodiments of the present invention is provided in connection with the accompanying drawings, which are not intended to limit the invention. For a better understanding of the technical aspects of the present disclosure, reference is made to the following detailed description taken in conjunction with the accompanying drawings. Embodiments of the present disclosure are described in further detail below with reference to the figures and the detailed description, but the present disclosure is not limited thereto.

All terms (including technical or scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs unless specifically defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

Referring to fig. 1, in the normal operation process of the heat exchange device of the embodiment of the present application, especially after the deposition of ash and even scaling is generated in the heat exchange passage 2 of the heat exchange device, the thermal efficiency of the heat exchanger is directly reduced greatly, and the scaling in the heat exchange passage 2 resides for a long time, which makes the post-cleaning more difficult. However, after the heat exchange path 2 is cleaned by conventional methods, such as mechanical, high-pressure water, chemical acid cleaning, etc., the heat exchange path 2 is seriously damaged, and the service life of the heat exchange device is shortened.

In addition, it should be noted that the heat exchange medium in the heat exchange passage 2 of the heat exchange device according to the embodiment of the present invention is a liquid containing different solid particulate matters, such as slag water, sewage, and the like.

In order to avoid the technical problems, the embodiment of the invention discloses a heat exchange device, and with reference to fig. 1, the heat exchange device comprises a controller 6 and a heat exchanger, the heat exchanger comprises an inlet 1, an outlet 7 and a plurality of heat exchange passages 2 connected in parallel between the inlet 1 and the outlet 7, a detection device and an electric control valve 5 are arranged on the heat exchange passages 2, and the controller 6 is respectively electrically connected with the detection device and the electric control valve 5; the detection device comprises a flowmeter 3, wherein the flowmeter 3 is used for detecting the flow of the heat exchange medium in the heat exchange passage 2 and sending a flow detection signal to the controller 6 when the flow reaches a flow threshold value; the controller 6 receives the flow detection signal and sends a closing signal to the electronic control valve 5 on the other at least one heat exchange passage 2 so as to close the other at least one heat exchange passage 2 through the electronic control valve 5. The at least one other heat exchange path 2 is at least one heat exchange path 2 other than the heat exchange path 2 in which the flow meter 3 that transmits the flow rate detection signal is located, among the plurality of heat exchange paths 2 of the heat exchanger.

In the present embodiment, the heat exchange passages 2 are pipes made of different structures, shapes or different materials.

Because the heat exchange device of the embodiment of the invention is automatically controlled, the heat exchange channel 2 is cleaned and maintained at higher heat exchange efficiency, and meanwhile, the excessive abrasion of the heat exchange channel 2 is also prevented. Particularly, once the heat exchange passages 2 are scaled, the inner diameter of the heat exchange passages is reduced, the flow rate is reduced, the flow meter 3 detects the flow rate of the heat exchange medium in the heat exchange passage 2 in real time, and sets a flow rate threshold value for representing the possible scaling of the heat exchange passage 2, when the flow meter 3 detects that the flow rate of the heat exchange medium in the heat exchange passage 2 reaches the flow rate threshold value, the flow rate detection signal is sent to the controller 6, the controller 6 closes at least one other heat exchange passage 2 through the electric control valve 5, so that the heat exchange medium originally flowing through the heat exchange passages 2 can only pass through one heat exchange passage 2 in an open state, and therefore, due to the increase of the hydraulic pressure of the heat exchange medium, the flow rate of the heat exchange medium is inevitably increased greatly relative to the previous flow rate, the scaling in the heat exchange passages 2 can be effectively washed, and the, the manual participation is not needed, and the operation of the whole detection process is more accurate. In addition, because can in time accurately discover to take place the scale deposit and carry out timely processing in the heat transfer route 2, effectively avoid the scale deposit to the damage of heat transfer route 2, improve heat transfer device's life from this, and because carry out cleaning under the shutdown state that need not, and then correspondingly reduce maintenance or replacement cost.

In some embodiments, in order to improve the real-time evaluation of the internal scaling condition of the heat exchange passage 2, the detection device further comprises a thermometer 4, and the thermometer 4 is configured to detect the temperature of the heat exchange medium in the heat exchange passage 2 and send a temperature detection signal to the controller 6 when the temperature reaches a temperature threshold; and when receiving the temperature detection signal and/or the flow detection signal, the controller 6 sends a closing signal to the electronic control valve 5 on the other at least one heat exchange passage 2. Because the flow and the temperature of the heat exchange medium have different degrees of influence on the generation of the scale, in the specific implementation process, on the basis of combining the physical attributes of the heat exchange medium, the corresponding relation is set between the flow and the temperature of the scale and the current state of the scale is obtained through the corresponding relation after the flow and the temperature which are correspondingly detected by the flowmeter 3 and the thermometer 4, and then the decision of cleaning is made, so that an accurate basis is provided for automatically cleaning the scale.

In some embodiments, the electrically controlled valve 5 is a solenoid valve. The electromagnetic valve is an industrial device controlled by electromagnetism, is an automatic basic element for controlling fluid, belongs to an actuator, and is not limited to hydraulic pressure and pneumatic pressure. The electromagnetic valve can be matched with different circuits to realize expected control, and the control precision and flexibility can be ensured.

In some embodiments, the controller 6 is a PLC controller 6. The PLC controller 6 is a programmable logic controller 6, wherein the programmable logic controller 6 is a digital operation controller 6 with a microprocessor for automatic control, and can load control instructions into a memory at any time for storage and execution. In this embodiment, since the measurement parameter varies with the sectional area of the heat exchange path 2 of the heat exchange device, the composition of the heat exchange medium flowing through the heat exchange path 2, the flow rate, and other parameters, the PLC controller 6 can adjust the measurement parameter in time.

To fully understand the workflow of the embodiment of the present invention, the exemplary configuration shown in fig. 1 is used as an example for description, and specifically, reference may be made to fig. 1.

When the heat exchange device only comprises two heat exchange passages 2, the flow meter 3 detects the flow of the heat exchange medium in the heat exchange passage 2, and sends a flow detection signal to the controller 6 when the flow of one heat exchange passage 2 reaches a flow threshold value; and after receiving the flow detection signal, the controller 6 sends a closing signal to the electric control valve 5 on the other heat exchange passage 2, and closes the other heat exchange passage 2 through the electric control valve 5.

In a specific implementation process, the temperature of the heat exchange medium in the heat exchange passage 2 can be combined and comprehensively considered with the flow, and since the flow and the temperature are measurement parameters, the temperature can be adjusted according to the physical structure of the heat exchange passage 2 in the measurement process, and the threshold range is adjusted correspondingly.

In addition, as shown in fig. 1, when the heat exchange device includes only three or more than three heat exchange paths 2, it is considered that the probability that two heat exchange paths 2 simultaneously satisfy the threshold value is very small in the practical application process, however, it is not excluded in the embodiment of the present application that the condition that the heat exchange media in two heat exchange paths 2 simultaneously satisfy the threshold value occurs. Therefore, in order to understand the working process of the embodiment of the present application, only when the measured parameter of the heat exchange medium in one heat exchange path 2 satisfies the threshold value, at this time, the above process is repeated, that is, after the controller 6 receives the flow detection signal, the controller sends a closing signal to the electronic control valves 5 on the other two or more heat exchange paths 2, and finally closes the other two or more heat exchange paths 2, and only one heat exchange path 2 is kept in the continuously opened state.

The heat exchange medium passes through the above-mentioned flow path in the heat exchange path 2 for the heat exchange medium that originally flows through a plurality of heat exchange paths 2 can only pass through from a heat exchange path 2 that is in the open condition this moment, consequently, because the increase of heat exchange medium's hydraulic pressure, must lead to the velocity of flow of heat exchange medium to improve by a wide margin for the velocity of flow before, and then can effectively erode the scale deposit in the heat exchange path 2, reach abluent purpose.

On the other hand, based on the same technical concept, the invention also provides a control method of the heat exchange device, the control method evaluates the scaling condition in real time by measuring the heat exchange efficiency of the heat exchange passage 2 in real time and processes in time according to the evaluation result, thereby effectively prolonging the service life of the heat exchange device and correspondingly reducing the maintenance or replacement cost.

Fig. 2 is a flowchart of a control method of a heat exchanger according to an embodiment of the present invention. The method in the embodiment of the invention can comprise the following steps: the heat exchange device comprises a controller 6 and a heat exchanger, the heat exchanger comprises an inlet 1, an outlet 7 and a plurality of heat exchange passages 2 connected between the inlet 1 and the outlet 7 in parallel, a detection device and an electric control valve 5 are arranged on each heat exchange passage 2, the detection device comprises a flow meter 3, and the controller 6 is electrically connected with the flow meter 3 and the electric control valve 5 respectively; the method comprises the following steps:

step 1: detecting the flow of the heat exchange medium in the heat exchange passage 2 through the flowmeter 3, and sending a flow detection signal to the controller 6 when the flow of the heat exchange medium in the heat exchange passage 2 where the flowmeter 3 is located reaches a flow threshold value;

step 2: the controller 6 responds to the flow detection signal and sends a closing signal to the electronic control valve 5 on the other at least one heat exchange passage 2 so as to close the other at least one heat exchange passage 2 through the electronic control valve 5.

Specifically, when the detected flow rate of the heat exchange path 2 is reached, the step 1 further includes sending a flow rate detection signal to the controller 6 when the flow rate of the heat exchange medium in the heat exchange path 2 where the flow meter 3 is located reaches a flow rate threshold value, specifically: when the deviation between the flow rate of the heat exchange medium in the heat exchange passage 2 where the flow meter 3 is located and a preset flow rate value reaches a first deviation threshold value, a flow rate detection signal is sent to the controller 6. And, after the scaling, the sectional area of the heat exchange path 2 is correspondingly reduced, the flow rate of the heat exchange medium passing through the heat exchange path 2 is inevitably changed, and when the first deviation threshold is 10% of the preset flow rate value, a flow rate detection signal is sent to the controller 6. Regarding the proportional relation of the fluctuation range between the first deviation threshold and the preset flow value, the heat exchange device can be correspondingly adjusted according to the specific conditions of the heat exchange device in the operation process, for example, the size of the cross section of the heat exchange passage 2, the length of the heat exchange passage 2, the viscosity of the heat exchange medium in the heat exchange passage 2, the concentration of the contained particulate matters and the like are considered, and finally the fluctuation range value is set to be a more reasonable specific value or in a reasonable interval as far as possible when the fluctuation range value is set, so that the problem caused by unreasonable setting is avoided, for example, the fluctuation interval is set to be smaller, so that the measurement is more sensitive, and the frequent closing of the heat exchange passage 2 is caused to cause the stability of the operation; or the fluctuation interval is set to be larger, so that the measurement is slower, the cleaning treatment is started only when the scaling is serious, and the damage of the heat exchange passage 2 can be caused.

In step 2, the controller 6 responds to the flow detection signal and sends a closing signal to the electronic control valve 5 on the other at least one heat exchange passage 2 to close the other at least one heat exchange passage 2 through the electronic control valve 5. Due to the fact that the other at least one heat exchange passage 2 is closed, the heat exchange medium passing through the heat exchange passage 2 passes through the heat exchange passage 2 which is not closed in a concentrated mode, and the flow speed of the heat exchange medium is correspondingly improved due to the fact that the pressure of the heat exchange medium in the heat exchange passage 2 is improved, therefore, scaling in the heat exchange passage 2 is automatically cleaned under the flushing of the heat exchange medium flowing through the heat exchange passage 2, and the beneficial effect of rapidly cleaning the heat exchange passage 2 is achieved on the premise that manual operation is not needed.

In order to improve the detection accuracy and reliability, other judgment means are provided in the embodiment. Specifically, the detection device further comprises a thermometer 4 electrically connected with a controller 6, and the method further comprises:

the temperature of the heat exchange medium in the heat exchange passage 2 is detected through the thermometer 4, and when the temperature of the heat exchange medium in the heat exchange passage 2 where the thermometer 4 is located reaches a temperature threshold value, a temperature detection signal is sent to the controller 6; the controller 6 responds to the temperature detection signal and/or the flow detection signal and sends a closing signal to the electronic control valve 5 on the other at least one heat exchange passage 2 so as to close the other at least one heat exchange passage 2 through the electronic control valve 5.

The fact is that the temperature of the heat exchange medium directly affects the motion state of the heat exchange medium, so that the temperature and the flow rate are correspondingly high, and vice versa; therefore, in this embodiment, the temperature of the heat exchange medium is also used as a parameter, and the current scaling state in the heat exchange path 2 is more accurately reflected and judged, wherein when the temperature of the heat exchange medium in the heat exchange path 2 where the thermometer 4 is located reaches a temperature threshold, a temperature detection signal is sent to the controller 6, specifically:

when the deviation between the temperature of the heat exchange medium in the heat exchange passage 2 where the thermometer 4 is located and a preset temperature value reaches a second deviation threshold value, a temperature detection signal is sent to the controller 6. Wherein the second deviation threshold is 10% of the preset temperature value. When the fluctuation range of the temperature of the heat exchange medium exceeds 10%, a flow rate detection signal is sent to the controller 6.

Regarding the proportional relation of the fluctuation range between the second deviation threshold and the preset temperature value, corresponding adjustment can be performed in combination with the specific situation of the heat exchange device in the operation process, for example, considering the sectional area of the heat exchange passage 2, the length of the heat exchange passage 2, the viscosity of the heat exchange medium in the heat exchange passage 2, the temperature value of the environment outside the heat exchange passage 2, the concentration of the contained particulate matters and the like, finally setting the fluctuation range value as a reasonable specific value or in a reasonable interval as far as possible when setting the fluctuation range value, and avoiding the problem caused by unreasonable setting, for example, the fluctuation interval is set to be small, so that the measurement is more sensitive, and the frequent closing of the heat exchange passage 2 is caused to cause the stability of the operation of the heat exchange device; or the fluctuation interval is set to be larger, so that the measurement is slower, the cleaning treatment is started only when the scaling is serious, and the damage of the heat exchange passage 2 can be caused.

Moreover, although illustrative embodiments have been described herein, the scope includes any and all embodiments having equivalent elements, modifications, omissions, combinations (e.g., of aspects across various embodiments), adaptations or alterations based on the present disclosure. The elements in the claims are to be interpreted broadly based on the language employed in the claims and not limited to examples described in the specification or during the life of the application. Further, the steps of the disclosed methods may be modified in any manner, including by reordering steps or inserting or deleting steps. It is intended, therefore, that the description be regarded as examples only, with a true scope being indicated by the following claims and their full scope of equivalents.

The above description is intended to be illustrative and not restrictive. For example, the above-described examples (or one or more aspects thereof) may be used in combination with each other. Other embodiments may be utilized, for example, by one of ordinary skill in the art, upon reading the above description. Also, in the foregoing detailed description, various features may be combined together to simplify the present disclosure. This should not be interpreted as intending that an unclaimed disclosed feature is essential to any claim. Thus, the following claims are hereby incorporated into the detailed description as examples or embodiments, with each claim standing on its own as a separate embodiment, and it is contemplated that these embodiments may be combined with each other in various combinations or permutations. The scope of the invention should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled.