Digital judgment system for cleaning of water-water heat exchanger in heat exchange station of central heating system

Abstract

The utility model discloses a digital judgment system for cleaning a water-water heat exchanger in a heat exchange station of a central heating system, and relates to the technical field of heat exchange station equipment of the heating system. The temperature sensors are arranged on pipelines of an inlet and an outlet of the heat exchanger and used for measuring the temperature of the inlet and the outlet; the ultrasonic level meters are arranged on pipelines of an inlet and an outlet of the heat exchanger and are used for measuring sound velocities of ultrasonic waves at the inlet and the outlet in water and / or dirt; the field control processor is used for receiving the temperature data of the temperature sensor and judging the efficiency of the heat exchanger based on the temperature data; the controller is further used for receiving sound velocity data of the ultrasonic level meter and judging the thickness of dirt in the heat exchanger tube based on the sound velocity data. The actual operation state of the heat exchanger is monitored through the temperature sensor and the ultrasonic level meter, when the efficiency of the heat exchanger is reduced to a certain degree or dirt reaches a certain thickness, reminding is conducted, then the heat exchanger can be cleaned, and energy loss caused by long-term low-efficiency operation is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchange station equipment of a heating system, and in particular to a digital judgment system for cleaning a water-water heat exchanger in a heat exchange station of a centralized heating system. Background Art

[0002] In current heating systems in northern cities, air conditioning terminal equipment such as fan coil units are commonly used as cooling equipment in the summer, while in the winter, they are switched to using the municipal heating network as a heat source for heating. The connection between these systems and the municipal heating network mainly relies on an indirect method, that is, the high-temperature hot water in the primary pipe network (municipal heating network) is heated by the water-water heat exchanger in the heat exchange station to heat the low-temperature water in the secondary pipe network to achieve heat transfer. However, during this heat exchange process, due to the large amount of water circulating in the heat exchanger, substances such as sulfates, carbonates, and silicates dissolved in the hot water for heating are easily deposited inside the heat exchanger after a period of operation and may form solid or soft mud-like dirt. The accumulation of these dirt not only significantly reduces the heat transfer efficiency of the heat exchanger and weakens its overall performance, but also increases the flow resistance of the system, resulting in a significant increase in the energy consumption of the water pump while maintaining the same heat exchange capacity, which is not conducive to achieving energy conservation and emission reduction goals.

[0003] To determine whether a heat exchanger requires cleaning and descaling, the two most widely used methods in the industry are laboratory scale inhibition testing and on-site monitoring. While accurate, laboratory scale inhibition testing is primarily for scientific research and analysis, making it difficult to directly apply to rapid testing in actual engineering sites. On-site monitoring requires suspending system operation and disassembling the heat exchanger to inspect for scale deposits. This method is not only cumbersome and impacts heating services, but also lacks real-time online monitoring capabilities. Utility Model Content

[0004] The purpose of the utility model is to provide a digital judgment system for cleaning water-water heat exchangers in a heat exchange station of a centralized heating system. The system monitors the actual operating status of the heat exchanger through temperature sensors and ultrasonic level meters. When the efficiency of the heat exchanger drops to a certain level or the dirt reaches a certain thickness, a reminder is issued, and then the heat exchanger can be cleaned to avoid energy loss caused by long-term inefficient operation.

[0005] To achieve the above objectives, the present application proposes a digital judgment system for cleaning water-water heat exchangers in a heat exchange station of a centralized heating system, comprising:

[0006] A first temperature sensor is provided on the pipe at the inlet of the heat exchanger and is used to measure the temperature at the inlet;

[0007] A second temperature sensor is provided on the pipe at the outlet of the heat exchanger and is used to measure the temperature at the outlet;

[0008] The first ultrasonic level meter is installed on the pipe at the heat exchanger inlet and is used to measure the sound velocity of the ultrasonic wave in the water and / or dirt at the inlet;

[0009] The second ultrasonic level meter is installed on the pipe at the outlet of the heat exchanger and is used to measure the sound velocity of the ultrasonic wave in the water and / or dirt at the outlet;

[0010] The field control processor is used to receive temperature data from the first temperature sensor and the second temperature sensor, and judge the efficiency of the heat exchanger based on the temperature data; it is also used to receive sound velocity data from the first ultrasonic level meter and the second ultrasonic level meter, and judge the thickness of the dirt in the heat exchanger tube based on the sound velocity data.

[0011] In one embodiment, the heat exchanger inlet includes a cold water inlet and a hot water inlet; the heat exchanger outlet includes a cold water outlet and a hot water outlet.

[0012] In one embodiment, the first temperature sensor and the second temperature sensor are thermocouple thermometers with a temperature measurement range of -50°C to 200°C; the hot electrode of the thermocouple thermometer adopts a four-hole ceramic insulating sleeve and brass as a protective sleeve, which is wrapped with silica gel and self-adhesive foil lining and fits tightly on the inlet and outlet pipes of the heat exchanger.

[0013] In one embodiment, the first temperature sensors at the cold water inlet and hot water inlet of the heat exchanger, and the second temperature sensors at the cold water outlet and hot water outlet are all arranged at a position three times the pipe diameter away from the heat exchanger. At least two temperature sensors are arranged on each connecting main pipe and fastened with clamps. The distance between the temperature sensors is more than two times the pipe diameter.

[0014] In one embodiment, the first ultrasonic level meter at the cold water inlet and hot water inlet of the heat exchanger, and the second ultrasonic level meter at the cold water outlet and hot water outlet are all arranged at a position three times the pipe diameter away from the heat exchanger. At least two ultrasonic level meters are arranged on each connecting main pipe and fastened with a plastic jacket. The distance between the ultrasonic level meters is more than two times the pipe diameter.

[0015] In one embodiment, a line connecting the ultrasonic transmitting probe and the ultrasonic receiving probe of the first ultrasonic level meter and the second ultrasonic level meter passes through the center of the heat exchanger pipe, and the outer shells of the ultrasonic transmitting probe and the ultrasonic receiving probe are wrapped with vibration isolation sponge.

[0016] In one embodiment, the field control processor is further connected to a buzzer and an alarm light. When the heat exchanger efficiency and / or the dirt thickness in the pipe is greater than a set threshold, the buzzer sounds an alarm and the alarm light flashes.

[0017] In one embodiment, the field control processor sets the dirt thickness threshold and the heat exchanger efficiency value through a single chip matrix keyboard.

[0018] In one embodiment, the data measured by the first temperature sensor, the second temperature sensor, the first ultrasonic level meter, and the second ultrasonic level meter are transmitted to the field control processor via a data transmission line of a USB interface.

[0019] In one embodiment, the electrical signals measured by the first temperature sensor and the second temperature sensor are led out through an aluminum sealed junction box, and the aluminum sealed junction box is treated with anti-static treatment to avoid interference with the transmission signal.

[0020] Compared with the existing technology, the above technical solution adopted by the present invention has the following advantages: the system is simple and reliable to implement, has a high degree of automation and digitization, and can dynamically monitor whether the heat exchanger needs to be cleaned in real time; when the heat exchanger efficiency and / or dirt thickness exceeds the set value, an alarm is issued to prompt cleaning of the heat exchanger, thereby ensuring the efficient and stable operation of the water-water heat exchanger in the heat exchange station and reducing the impact of dirt deposition in the heat exchanger on the equipment.

[0021] This system is not only applicable to newly built heat exchange stations, but can also be used in the digital transformation of existing heat exchange stations. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is the structural principle diagram of the digital judgment system for cleaning water-water heat exchangers in the heat exchange station of the centralized heating system;

[0023] Figure 2 This is the workflow diagram of the digital judgment system for cleaning water-water heat exchangers in the heat exchange station of the centralized heating system;

[0024] Among them: 1. first temperature sensor, 2. first ultrasonic level meter, 3. second temperature sensor, 4. second ultrasonic level meter. DETAILED DESCRIPTION

[0025] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0026] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" means two or more, unless otherwise clearly and specifically defined. "Several" means one or more, unless otherwise clearly and specifically defined.

[0028] In the description of this application, it should be understood that the terms "center", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0029] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0030] See also Figure 1 This embodiment provides a digital judgment system for cleaning water-water heat exchangers in a heat exchange station of a centralized heating system, including:

[0031] Temperature sensors installed at the cold water inlet, cold water outlet, hot water inlet, and hot water outlet of the heat exchanger are thermocouple thermometers, using standardized T-type thermocouples according to IEC standards. The thermocouple thermometer's hot electrode uses a four-hole ceramic insulating sleeve and a brass protective sleeve with high thermal conductivity. The protective sleeve is wrapped with ultra-thin high thermal conductivity silicone and self-adhesive foil lining, which fits tightly on the heat exchanger pipes.

[0032] Ultrasonic level meters are installed at the cold water inlet, cold water outlet, hot water inlet and hot water outlet of the heat exchanger, and the ultrasonic transmitting probe and ultrasonic receiving probe of the ultrasonic level meter are connected through the center of the heat exchanger pipe;

[0033] The field control processor is connected to the temperature sensor and the ultrasonic level meter to receive their measurement data;

[0034] The buzzer and alarm light emit sound and flash when an alarm is required. The sound pressure level of the alarm sound at 3m in at least one direction is equal to 75dB, and the alarm flash frequency can be 2Hz.

[0035] Lithium battery, battery voltage is 20V, the field control processor can be powered by power supply or battery.

[0036] See also Figure 2 This embodiment provides a method for operating a digital determination system for cleaning a water-water heat exchanger in a heat exchange station of a centralized heating system. The method first uses a temperature sensor to obtain the average value of the first five sets of measurement data after stable operation of the water-water heat exchanger in the centralized heating system heat exchange station. This average value is used as the efficiency value. The average value of the thickness of dirt deposits in the pipe is then obtained. This average thickness is used as a threshold value. The efficiency value and threshold value are written to a field control processor via a single-chip computer matrix keyboard. After the system is operational, the inlet and outlet temperatures of the water-water heat exchanger are measured using the temperature sensor. The ultrasonic propagation time between two probes is measured using an ultrasonic level meter. The measured data is transmitted hourly and recorded to the on-site control processor. The on-site control processor can calculate the dirt thickness based on the sound velocity of ultrasound in water, the sound velocity of ultrasound in scale, the initial value of the time it takes for ultrasound to be transmitted to the probe, and the actual measured value of the time it takes for ultrasound to be transmitted to the probe during the operation of the heat exchange system. This method is a conventional measurement method based on existing technology. The on-site control processor makes the following two judgments: First, if the deviation between the temperature data and the efficiency value reaches 20%, the buzzer will sound an alarm and the alarm light will flash; second, if the scale thickness is greater than the threshold, the buzzer will sound an alarm and the alarm light will flash.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A digital judgment system for cleaning water-water heat exchangers in a heat exchange station of a centralized heating system, characterized in that: include: A first temperature sensor is provided on the pipe at the inlet of the heat exchanger and is used to measure the temperature at the inlet; A second temperature sensor is provided on the pipe at the outlet of the heat exchanger and is used to measure the temperature at the outlet; The first ultrasonic level meter is installed on the pipe at the heat exchanger inlet and is used to measure the sound velocity of the ultrasonic wave in the water and / or dirt at the inlet; The second ultrasonic level meter is installed on the pipe at the outlet of the heat exchanger and is used to measure the sound velocity of the ultrasonic wave in the water and / or dirt at the outlet; The field control processor is used to receive temperature data from the first temperature sensor and the second temperature sensor, and judge the efficiency of the heat exchanger based on the temperature data; it is also used to receive sound velocity data from the first ultrasonic level meter and the second ultrasonic level meter, and judge the thickness of the dirt in the heat exchanger tube based on the sound velocity data.

2. A digital judgment system for cleaning water-water heat exchangers in a heat exchange station of a centralized heating system according to claim 1, characterized in that: The heat exchanger inlet includes a cold water inlet and a hot water inlet; the heat exchanger outlet includes a cold water outlet and a hot water outlet.

3. The digital judgment system for cleaning water-water heat exchangers in a heat exchange station of a centralized heating system according to claim 1, characterized in that: The first temperature sensor and the second temperature sensor are thermocouple thermometers with a temperature measurement range of -50°C to 200°C; the hot electrode of the thermocouple thermometer adopts a four-hole ceramic insulating sleeve and brass as a protective sleeve. The protective sleeve is wrapped with silicone and self-adhesive foil lining, which fits tightly on the inlet and outlet pipes of the heat exchanger.

4. A digital judgment system for cleaning water-water heat exchangers in a heat exchange station of a centralized heating system according to claim 2, characterized in that: The first temperature sensor at the cold water inlet and hot water inlet of the heat exchanger, and the second temperature sensor at the cold water outlet and hot water outlet are all arranged at a position three times the pipe diameter away from the heat exchanger. At least two temperature sensors are arranged on each connecting main pipe and fastened with clamps. The distance between the temperature sensors is more than twice the pipe diameter.

5. The digital judgment system for cleaning water-water heat exchangers in a heat exchange station of a centralized heating system according to claim 2, characterized in that: The first ultrasonic level meter at the cold water inlet and hot water inlet of the heat exchanger, and the second ultrasonic level meter at the cold water outlet and hot water outlet are all arranged at a position three times the pipe diameter away from the heat exchanger. At least two ultrasonic level meters are arranged on each connecting main pipe and fastened with plastic jackets. The distance between the ultrasonic level meters is more than twice the pipe diameter.

6. A digital judgment system for cleaning water-water heat exchangers in a heat exchange station of a centralized heating system according to claim 1, characterized in that: The ultrasonic transmitting probe and the ultrasonic receiving probe of the first ultrasonic level meter and the second ultrasonic level meter are connected through the center of the heat exchanger pipe. The shells of the ultrasonic transmitting probe and the ultrasonic receiving probe are wrapped with vibration isolation sponge.

7. A digital judgment system for cleaning water-water heat exchangers in a heat exchange station of a centralized heating system according to claim 1, characterized in that: The field control processor is also connected to a buzzer and an alarm light. When the heat exchanger efficiency and / or the dirt thickness in the pipe is greater than a set threshold, the buzzer sounds an alarm and the alarm light flashes.

8. The digital judgment system for cleaning water-water heat exchangers in a heat exchange station of a centralized heating system according to claim 1, characterized in that: The field control processor sets the dirt thickness threshold and the heat exchanger efficiency value through the single chip matrix keyboard.

9. A digital judgment system for cleaning water-water heat exchangers in a heat exchange station of a centralized heating system according to claim 1, characterized in that: The data measured by the first temperature sensor, the second temperature sensor, the first ultrasonic level meter, and the second ultrasonic level meter are transmitted to the field control processor via a data transmission line of a USB interface.

10. A digital judgment system for cleaning water-water heat exchangers in a heat exchange station of a centralized heating system according to claim 1, characterized in that: The electrical signals generated by the first temperature sensor and the second temperature sensor are led out through an aluminum sealed junction box, and the aluminum sealed junction box is treated with anti-static treatment.

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