Heat network system and control method thereof

Abstract

This invention belongs to the field of nuclear energy heating technology and discloses a heating network system and its control method. The heating network system includes an external heat exchange station, a heating network heater, an inlet water pipe, a return water pipe, a balancing pipe, and a controller. A water level gauge is connected to the heating network heater. One end of the inlet water pipe is connected to the heating network heater, and the other end is connected to the pipe of the external heat exchange station. An outlet valve connected to the inlet water pipe is installed on the outlet side of the heating network heater. One end of the return water pipe is connected to the pipe of the external heat exchange station, and the other end is connected to the heating network heater. An inlet valve connected to the return water pipe is installed on the inlet side of the heating network heater. Both ends of the balancing pipe are connected to the return water pipe and the inlet water pipe, respectively, and a regulating valve is installed on the balancing pipe. The controller is electrically connected to the water level gauge, the inlet valve, the outlet valve, and the regulating valve. It can control the opening degree and opening / closing speed of the inlet valve, the outlet valve, and the regulating valve according to the water level information from the water level gauge. Construction and maintenance are simple, and the system is effective against water hammer.

Description

Technical Field

[0001] This invention relates to the field of nuclear heating technology, and in particular to a heating network system and its control method. Background Technology

[0002] Nuclear heating uses extraction steam technology, drawing a portion of the steam generated from the nuclear power plant's turbines as a heat source to heat water in the heating network heaters. The heated water is then supplied to external heat exchange stations for user use. After use, the water temperature drops and it is returned to the heating network heaters for reuse. When the water level in the heating network heaters rises, its inlet and outlet valves need to be closed to isolate the heaters and prevent equipment damage. This causes a rapid change in the flow rate and velocity of the water in the heating pipelines, creating water hammer and threatening the safety of the heating pipelines.

[0003] Patent application CN 109405052 A discloses a heating network water replenishment system, including an inlet pipe, a return pipe, and a replenishment pipe connected to the return pipe. One end of the return pipe is connected to the pipeline of an external heat exchange station, and the other end is connected to a heating network heater. One end of the inlet pipe is connected to the heating network heater, and the other end is connected to the pipeline of the external heat exchange station. The replenishment pipe includes a high-level water tank, one end of which is connected to a water source, and the other end is connected to the return pipe via the replenishment pipe, used to replenish water to the return pipe. The high-level water tank has a large cross-sectional area, resulting in a slower water level drop, which acts as a buffer, thus making the change in return water pressure relatively slow and facilitating the release of water hammer pressure.

[0004] However, elevated water tanks occupy a large area, are complex to install and maintain, and are inconvenient to use in heating networks. Summary of the Invention

[0005] One objective of this invention is to provide a heating network system that occupies little space, is simple to construct and maintain, and can effectively prevent water hammer.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] The heating network system includes:

[0008] External network heat exchange station;

[0009] A heating network heater, wherein a water level gauge is connected to the heating network heater;

[0010] The water inlet pipe has one end connected to the heating network heater and the other end connected to the pipeline of the external network heat exchange station. The water outlet side of the heating network heater is provided with a water outlet valve, which is connected to the water inlet pipe.

[0011] The return water pipeline has one end connected to the pipeline of the external heat exchange station and the other end connected to the heat network heater. The heat network heater is provided with an inlet valve on the inlet side, and the inlet valve is connected to the return water pipeline.

[0012] A balancing pipeline, one end of which is connected to the return water pipeline and the other end of which is connected to the inlet water pipeline, and a regulating valve is provided on the balancing pipeline;

[0013] The controller is electrically connected to the water level gauge, the inlet valve, the outlet valve, and the regulating valve, and is capable of controlling the opening degree and opening / closing speed of the inlet valve, the outlet valve, and the regulating valve based on the water level information measured by the water level gauge.

[0014] Optionally, a first flow meter is installed on the water inlet pipe. The first flow meter is electrically connected to the controller. The controller can control the opening degree and opening and closing speed of the water inlet valve, the water outlet valve and the regulating valve according to the flow information measured by the first flow meter.

[0015] Optionally, a thermometer is also installed on the water inlet pipe. The thermometer is electrically connected to the controller, and the controller can control the opening degree of the regulating valve, the water inlet valve, and the water outlet valve according to the water temperature information measured by the thermometer.

[0016] Optionally, a second flow meter is installed on the return water pipeline, which is used to detect the flow rate entering the heating network heater.

[0017] Optionally, it also includes an alarm device electrically connected to the controller, which issues an alarm when the water level detected by the water level gauge exceeds the water level set value.

[0018] Optionally, multiple heating network heaters are provided, and the multiple heating network heaters are arranged in parallel. Multiple water level gauges, inlet valves, and outlet valves are also provided. The controller can control the opening degree and opening and closing speed of the corresponding inlet valve and outlet valve according to the water level information measured by each water level gauge.

[0019] Another objective of this invention is to provide a heating network system control method that can control the above-mentioned heating network system to operate smoothly and avoid water hammer.

[0020] To achieve this objective, the present invention adopts the following technical solution:

[0021] A heating network system control method, wherein the heating network system described above is used, includes the following steps:

[0022] The water level gauge detects the water level inside the heating network heater and transmits the water level information to the controller in real time;

[0023] The controller compares the water level with the water level setpoint.

[0024] When the water level exceeds the set water level value, the controller gradually closes the inlet and outlet valves and controls the opening degree and opening speed of the regulating valve to ensure a constant water flow through the regulating valve.

[0025] Optionally, it also includes:

[0026] The flow rate in the inlet pipe is detected, and the flow information is transmitted to the controller in real time.

[0027] When the water level exceeds the set water level value, the controller controls the closing speed of the inlet valve and outlet valve, and controls the opening degree and opening speed of the regulating valve, so that the measured flow rate in the inlet pipeline remains at the level of the previous moment.

[0028] Optionally, it also includes:

[0029] The thermometer installed on the inlet pipe detects the water temperature in the inlet pipe and transmits the water temperature information to the controller in real time;

[0030] The controller compares the water temperature with the set temperature value and controls the opening of the regulating valve, inlet valve, and outlet valve to keep the water temperature measured by the thermometer at the set temperature value.

[0031] Optionally, when the water level detected by the water level gauge exceeds the water level set value, the controller will no longer control the regulating valve, inlet valve, and outlet valve based on the water temperature information measured by the thermometer.

[0032] The beneficial effects of this invention are:

[0033] The heating network system provided by this invention includes an external heat exchange station, a heating network heater, an inlet pipe, a return pipe, a balancing pipe, and a controller. The heating network heater heats the water in the network. The inlet pipe delivers hot water to the external heat exchange station for user use. After the hot water temperature drops, it returns to the heating network heater via the return pipe for reheating and reuse. When the water level gauge detects that the water level in the heating network heater has risen above the set value, the controller gradually closes the inlet and outlet valves to isolate the heating network heater and prevent malfunctions. Simultaneously, the controller controls the opening degree and opening speed of the regulating valve on the balancing pipe to ensure a constant water flow through the regulating valve, preventing strong water impacts on the return pipe and the formation of water hammer. This heating network system, by setting up a balancing pipe and regulating valves, and controlling the valve operation status through the controller, occupies less space compared to setting up a high-level water tank, is simple and quick to construct and maintain, and reliably prevents water hammer.

[0034] The heating network system control method provided by this invention transmits the water level information detected by the water level gauge to the controller. When the controller compares the water level and finds that it exceeds the water level set value, it controls the inlet valve and outlet valve to gradually close to avoid heating network heater failure. At the same time, it controls the opening degree and opening speed of the regulating valve to keep the water flow through the regulating valve constant, thereby avoiding water hammer caused by water impact in the pipeline. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the heating network system provided in an embodiment of the present invention.

[0036] In the picture:

[0037] 1. External heat exchange station; 2. Heat network heater; 21. Water level gauge; 22. Inlet valve; 23. Outlet valve; 3. Inlet pipeline; 31. First flow meter; 32. Thermometer; 4. Return pipeline; 41. Second flow meter; 5. Balancing pipeline; 51. Regulating valve;

[0038] LICA (Level Indication Control Alarm);

[0039] TICA (Temperature Indication Control Alarm);

[0040] FIC (flow indicator control);

[0041] MOD (modulate), regulation;

[0042] H3 (high 3), the third level water level value;

[0043] CL (control);

[0044] AND, AND instruction;

[0045] OR command. Detailed Implementation

[0046] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0047] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0048] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0049] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0050] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0051] This embodiment provides a heating network system that uses nuclear energy to provide heat to users. For example... Figure 1As shown, the heating network system provided in this embodiment includes an external network heat exchange station 1, a heating network heater 2, an inlet water pipe 3, a return water pipe 4, a balancing pipe 5, and a controller. A water level gauge 21 is connected to the heating network heater 2 to detect the water level in the heater 2. One end of the inlet water pipe 3 is connected to the heating network heater 2, and the other end is connected to the pipe of the external network heat exchange station 1. An outlet valve 23 is provided on the outlet side of the heating network heater 2, and the outlet valve 23 is connected to the inlet water pipe 3. One end of the return water pipe 4 is connected to the pipe of the external network heat exchange station 1, and the other end is connected to the heating network heater 2. An inlet valve 22 is provided on the inlet side of the heating network heater 2, and the inlet valve 22 is connected to the return water pipe 4. One end of the balancing pipe 5 is connected to the return water pipe 4, and the other end is connected to the inlet water pipe 3. A regulating valve 51 is provided on the balancing pipe 5. The controller is electrically connected to the water level gauge 21, the inlet valve 22, the outlet valve 23, and the regulating valve 51. It can control the opening degree and opening and closing speed of the inlet valve 22, the outlet valve 23, and the regulating valve 51 according to the water level information measured by the water level gauge 21.

[0052] The heating network heater 2 is used to heat the water in the pipe network. The inlet pipe 3 delivers hot water to the external network heat exchange station 1 for user use. After the hot water temperature drops, it returns to the heating network heater 2 via the return pipe 4 for reheating and recycling. When the water level gauge 21 detects that the water level in the heating network heater 2 has risen above the set water level value, the controller controls the inlet valve 22 and outlet valve 23 to gradually close to isolate the heating network heater 2 and prevent it from malfunctioning. At the same time, the controller controls the opening degree and opening speed of the regulating valve 51 on the balancing pipe 5 to ensure a constant water flow through the regulating valve 51 and prevent strong water impact on the pipe in the return pipe 4, thus preventing water hammer. This heating network system, by setting up the balancing pipe 5 and the regulating valve 51 and controlling the working status of the valves through the controller, occupies less space, is simple and quick to construct and maintain, and has a reliable anti-water hammer effect compared to setting up a high-level water tank.

[0053] In this embodiment, the water level setpoint is at Figure 1 The control valve 51, denoted as H3, includes a pneumatic control valve 51. The pneumatic control valve 51 reacts quickly and can respond rapidly to the controller's commands. For example, the inlet valve 22 and the outlet valve 23 are both electric valves.

[0054] Furthermore, the inlet valve 22, outlet valve 23, and regulating valve 51 can all be manually adjusted, so that the normal operation of the heating network system can still be maintained through manual adjustment even if the controller fails.

[0055] Furthermore, the heating network system also includes an alarm device electrically connected to the controller. When the water level detected by the water level gauge 21 exceeds the set water level value, the alarm device sounds an alarm to alert the staff. In this embodiment, the water level gauge 21 is connected to the heating network heater 2 via a connecting pipe. The water level gauge 21 is located outside the heating network heater 2 for easy data reading by the staff. For example, the alarm device is a buzzer.

[0056] Furthermore, a first flow meter 31 is installed on the inlet pipe 3. The first flow meter 31 is electrically connected to the controller. The controller can control the opening degree and opening and closing speed of the inlet valve 22, the outlet valve 23, and the regulating valve 51 based on the flow information measured by the first flow meter 31. Specifically, when the water level gauge 21 detects that the water level in the heating network heater 2 has risen above the set water level value, the controller uses the flow value of the first flow meter 31 at the previous moment as an indicator to gradually close the inlet valve 22 and the outlet valve 23 to avoid water hammer caused by instantaneous closure. At the same time, the controller controls the opening degree and opening speed of the regulating valve 51 so that the flow detected by the first flow meter 31 always remains at the flow value level at the previous moment, avoiding excessive water volume fluctuations. For example, the previous moment can be 5 minutes or 10 minutes ago.

[0057] Furthermore, a second flow meter 41 is installed on the return water pipe 4. The second flow meter 41 is used to detect the water flow rate entering the heating network heater 2. The staff can check the control system of the controller by observing the flow information of the second flow meter 41 and perform regular maintenance.

[0058] Furthermore, a thermometer 32 is installed on the inlet pipe 3. The thermometer 32 is electrically connected to the controller, which can control the opening of the regulating valve 51, the inlet valve 22, and the outlet valve 23 based on the water temperature information measured by the thermometer 32. In the heating network system, the target water temperature of the inlet pipe 3, i.e., the water temperature setpoint, needs to be set according to user requirements. The controller compares the water temperature detected by the thermometer 32 with the water temperature setpoint and controls the opening of the regulating valve 51, the inlet valve 22, and the outlet valve 23 accordingly to keep the water temperature detected by the thermometer 32 at the water temperature setpoint level. Specifically, the water temperature in the balancing pipe 5 is lower, while the water temperature after being heated by the heating network heater 2 is higher. When the water temperature detected by the thermometer 32 is lower than the water temperature set value, the opening degree of the inlet valve 22 and the outlet valve 23 is increased or the opening degree of the regulating valve 51 is decreased. When the water temperature detected by the thermometer 32 is higher than the water temperature set value, the opening degree of the inlet valve 22 and the outlet valve 23 is decreased or the opening degree of the regulating valve 51 is increased. At the same time, the flow rate of the inlet pipe 3 must remain stable.

[0059] Furthermore, multiple heating network heaters 2 are provided, connected in parallel. Multiple water level gauges 21, inlet valves 22, and outlet valves 23 are also provided. The controller can control the opening degree and opening / closing speed of the corresponding inlet valve 22 and outlet valve 23 based on the water level information measured by each water level gauge 21. The parallel connection of multiple heating network heaters 2 allows for simultaneous heating of the water in the return water pipe 4, which is then delivered to the inlet water pipe 3. When a water level gauge 21 detects that the water level in its corresponding heating network heater 2 has risen above the set water level value, the controller gradually closes the corresponding inlet valve 22 and outlet valve 23 and controls the opening degree of the regulating valve 51. At this time, the water in the return water pipe 4 can still reach the inlet water pipe 3 through other heating network heaters 2. The multiple heating network heaters 2 serve as backups for each other, preventing the heating network system from continuously supplying heat if a heating network heater 2 is isolated.

[0060] This embodiment also provides a heating network system control method, which uses the above-mentioned heating network system and includes the following steps:

[0061] The water level gauge 21 detects the water level inside the heating network heater 2 and transmits the water level information to the controller in real time;

[0062] The controller compares the water level with the water level setpoint.

[0063] When the water level exceeds the set water level value, the controller controls the inlet valve 22 and outlet valve 23 to gradually close, isolating the heating network heater 2 and preventing the heating network heater 2 from malfunctioning. At the same time, the controller controls the opening degree and opening speed of the regulating valve 51 to keep the water flow through the regulating valve 51 constant, and to prevent the water in the return water pipe 4 from having a strong impact on the pipe and forming water hammer.

[0064] Furthermore, the control method for this heating network system also includes:

[0065] When the controller detects that the water level in the heating network heater 2 exceeds the set water level value, the controller will activate the alarm to alert the staff.

[0066] Furthermore, the control method for this heating network system also includes:

[0067] The flow rate in the inlet pipe 3 is detected and transmitted to the controller in real time. When the water level exceeds the set water level value, the controller controls the closing speed of the inlet valve 22 and the outlet valve 23, and controls the opening degree and opening speed of the regulating valve 51 to keep the measured flow rate in the inlet pipe 3 at the level of the previous moment, avoiding excessive changes in the flow rate in the pipe network. For example, the previous moment can be 5 minutes ago or 10 minutes ago. In this embodiment, the flow rate in the inlet pipe 3 is detected by a first flow meter 31 installed on the inlet pipe 3, and the first flow meter 31 is electrically connected to the controller.

[0068] Furthermore, the control method for this heating network system also includes:

[0069] The thermometer 32, installed on the inlet pipe 3, detects the water temperature in the inlet pipe 3 and transmits the water temperature information to the controller in real time. The controller compares the water temperature with the set water temperature value and controls the opening of the regulating valve 51, the inlet valve 22, and the outlet valve 23 to maintain the water temperature measured by the thermometer 32 at the set water temperature value, so as to stably meet the user's heating needs. Specifically, when the water temperature detected by the thermometer 32 is lower than the set water temperature value, the controller controls the opening of the inlet valve 22 and the outlet valve 23 to increase or controls the opening of the regulating valve 51 to decrease. When the water temperature detected by the thermometer 32 is higher than the set water temperature value, the controller controls the opening of the inlet valve 22 and the outlet valve 23 to decrease or controls the opening of the regulating valve 51 to increase. At the same time, the flow rate in the inlet pipe 3 must remain stable.

[0070] Furthermore, when the water level detected by the water level gauge 21 exceeds the set water level value, the controller will no longer control the regulating valve 51, inlet valve 22, and outlet valve 23 based on the water temperature information measured by the thermometer 32, thus preventing malfunction of the regulating valve 51, inlet valve 22, and outlet valve 23. When the water level detected by the water level gauge 21 does not exceed the set water level value, the heating network system operates smoothly, and the regulating valve 51, inlet valve 22, and outlet valve 23 are used to regulate the water temperature in the inlet pipe 3. When the water level detected by the water level gauge 21 exceeds the set water level value, the heating network heater 2 is isolated, and the regulating valve 51 is used to divert the water flow in the return water pipe 4 to prevent water hammer.

[0071] Furthermore, when the water level of one of the multiple parallel-connected heat network heaters 2 is detected by the corresponding water level gauge 21 to rise above the water level set value, the controller controls the corresponding inlet valve 22 and outlet valve 23 of the heat network heater 2 to gradually close, and controls the opening of the regulating valve 51, so that the heat network heater 2 is isolated, while the other heat network heaters 2 can continue to work to supply heat to the pipeline network.

[0072] Furthermore, when a certain heating network heater 2 is isolated, the controller should control the opening of the regulating valve 51 to ensure that the flow rate through other water inlet valves 22 remains unchanged, so as to avoid the water level changes in other heating network heaters 2 from affecting equipment safety.

[0073] Furthermore, when the controller malfunctions, the safe operation of the entire heating network system can be ensured by manually adjusting the inlet valve 22, outlet valve 23, and regulating valve 51.

[0074] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A heating network system, characterized in that, include: External heat exchange station (1); A heat network heater (2), on which a water level gauge (21) is connected; The water inlet pipe (3) is equipped with a first flow meter (31) and a thermometer (32). One end of the water inlet pipe (3) is connected to the heat network heater (2), and the other end is connected to the pipeline of the external heat exchange station (1). The water outlet side of the heat network heater (2) is equipped with a water outlet valve (23), which is connected to the water inlet pipe (3). The return water pipeline (4) has one end connected to the pipeline of the external network heat exchange station (1) and the other end connected to the heat network heater (2). The heat network heater (2) is provided with an inlet valve (22) on the inlet side, and the inlet valve (22) is connected to the return water pipeline (4). A balancing pipe (5) is provided, one end of which is connected to the return water pipe (4) and the other end is connected to the inlet water pipe (3). A regulating valve (51) is provided on the balancing pipe (5). The controller is electrically connected to the water level gauge (21), the first flow meter (31), the thermometer (32), the inlet valve (22), the outlet valve (23), and the regulating valve (51), and can control the opening degree and opening and closing speed of the inlet valve (22), the outlet valve (23), and the regulating valve (51) according to the water level information measured by the water level gauge (21), the first flow meter (31), and the thermometer (32); A second flow meter (41) is installed on the return water pipe (4), and the second flow meter (41) is used to detect the water flow rate entering the heating network heater (2).

2. The heating network system according to claim 1, characterized in that, It also includes an alarm device, which is electrically connected to the controller. When the water level information detected by the water level gauge (21) exceeds the water level set value, the alarm device issues an alarm.

3. The heating network system according to claim 1, characterized in that, Multiple heating network heaters (2) are provided, and multiple heating network heaters (2) are arranged in parallel. Multiple water level gauges (21), water inlet valves (22) and water outlet valves (23) are also provided. The controller can control the opening degree and opening and closing speed of the corresponding water inlet valves (22) and water outlet valves (23) according to the water level information measured by each water level gauge (21).

4. A control method for a heating network system, characterized in that, The heating network system as described in any one of claims 1-3 includes the following steps: The water level gauge (21) detects the water level in the heating network heater (2) and transmits the water level information to the controller in real time; The controller compares the water level with the water level setpoint. When the water level exceeds the set water level value, the controller controls the inlet valve (22) and outlet valve (23) to gradually close, and controls the opening degree and opening speed of the regulating valve (51) to make the water flow through the regulating valve (51) constant.

5. The heating network system control method according to claim 4, characterized in that, Also includes: The flow rate in the inlet pipe (3) is detected and the flow rate information is transmitted to the controller in real time; When the water level exceeds the set water level value, the controller controls the closing speed of the inlet valve (22) and the outlet valve (23), and controls the opening degree and opening speed of the regulating valve (51) so that the measured flow rate in the inlet pipeline (3) remains at the level of the previous moment.

6. The heating network system control method according to claim 4, characterized in that, Also includes: The thermometer (32) installed on the water inlet pipe (3) detects the water temperature in the water inlet pipe (3) and transmits the water temperature information to the controller in real time; The controller compares the water temperature with the water temperature setpoint and controls the opening of the regulating valve (51), the inlet valve (22) and the outlet valve (23) to keep the water temperature measured by the thermometer (32) at the water temperature setpoint level.

7. The heating network system control method according to claim 6, characterized in that, When the water level detected by the water level gauge (21) exceeds the water level setting value, the controller will no longer control the regulating valve (51), the inlet valve (22) and the outlet valve (23) based on the water temperature information measured by the thermometer (32).

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