Multi-heat-source heat supply unit

Abstract

The utility model relates to the technical field of heating ventilation air conditioners, in particular to a multi-heat-source heat supply unit, which is characterized in that a two-network circulation pipeline is provided with a heat meter, a water supply pipe of the two-network circulation pipeline is provided with a two-network water supply temperature measuring device, and a water return pipe of the two-network circulation pipeline is provided with a two-network water return temperature measuring device. The heat meter is matched with the two-network water supply temperature measuring device and the two-network water return temperature measuring device, so that the actual heat consumption of the two-network circulation pipeline can be obtained in real time, and the heat source connected to the one-network circulation pipeline is switched according to the actual heat consumption of the two-network circulation pipeline. By means of the technical scheme, when the actual heat load of the pipe network is reduced, a cheap heat source can be switched in time for heat supply, the cheap heat source is used to the maximum extent, meanwhile, under the action of the dirt separator, impurities in circulating water can be removed, resistance in a two-network circulating pipeline is reduced, power consumption can be effectively reduced, and the technical effect of reducing the heat supply cost is achieved.

Description

Technical Field

[0001] This utility model relates to the field of heating, ventilation and air conditioning technology, and specifically to a multi-heat source heating unit. Background Technology

[0002] With the development of heating technology, more heating systems have achieved multi-heat source network operation. The characteristics of multi-heat source network are reduced fuel consumption costs and increased reliability of heating systems, but at the same time, it also increases the complexity of multi-heat source network system operation. Although people are working hard to study the operation law of multi-heat source network, it is mostly at the theoretical level. There are still no heating units suitable for multi-heat source network operation that can be put into practical use. The operation of most multi-heat source units still relies mainly on manual monitoring of operating data and experience-based control.

[0003] In particular, when it comes to switching heat sources, current technologies mostly start and stop heat sources with different energy consumption in stages based on outdoor temperature. However, outdoor temperature cannot accurately reflect the actual heat load of the heating system, and heat sources with higher heating efficiency often have higher costs. Therefore, using the above method to switch between heat sources cannot select a lower energy consumption heat source for heating when the actual heat consumption of the pipeline network decreases, resulting in higher heating costs.

[0004] Therefore, there is an urgent need for a multi-heat source heating unit that can reduce heating costs. Utility Model Content

[0005] To address the aforementioned issues, this invention provides a multi-heat source heating unit. By using a heat meter to obtain the heat consumed by the secondary circulation pipeline, the heat source connected to the pipeline network can be switched, thereby maximizing the use of inexpensive heat sources and reducing heating costs.

[0006] To achieve the above objectives, this utility model provides the following solution:

[0007] A multi-heat source heating unit, comprising:

[0008] The first heat source, the second heat source, and the third heat source have successively increased costs and heating efficiency, and the first heat source, the second heat source, and the third heat source can provide heat to the downstream pipe network;

[0009] A circulating pipeline, wherein the first heat source, the second heat source and the third heat source are respectively connected to the circulating pipeline in a switchable manner;

[0010] The second-network circulation pipeline has one side connected to the first-network circulation pipeline for heat exchange, and the other side connected to the user pipeline.

[0011] A heat meter is installed on the secondary circulation pipeline, a secondary circulation water supply temperature measuring device is installed on the water supply pipe of the secondary circulation pipeline, and a secondary circulation water return temperature measuring device is installed on the water return pipe of the secondary circulation pipeline. Both the secondary circulation water supply temperature measuring device and the secondary circulation water return temperature measuring device are connected to the heat meter. The heat meter is used to provide data required for the on / off status of the first heat source, the second heat source, and the third heat source with the primary circulation pipeline.

[0012] The filter pipeline is connected to the second-network circulation pipeline, and a dirt remover for filtering dirt is installed on the filter pipeline.

[0013] Preferably, the circulating pipeline is equipped with an electric regulating valve for controlling the flow area of ​​the circulating pipeline.

[0014] Preferably, the secondary circulation pipeline is equipped with a secondary circulation temperature control pump for controlling the flow rate of circulating water in the secondary circulation pipeline.

[0015] Preferably, it also includes a temperature control pump frequency converter for controlling the operating frequency of the secondary network temperature control pump.

[0016] Preferably, the primary circulation pipeline and the secondary circulation pipeline are connected by a heat exchanger.

[0017] Preferably, it also includes a control unit, wherein the first heat source, the second heat source, the third heat source, the secondary network water supply temperature measuring device, the secondary network return water temperature measuring device, and the heat meter are all connected to the control unit.

[0018] Preferably, a water supply pressure measuring device is installed on the water supply pipe of the circulating pipeline, and a water return pressure measuring device is installed on the water return pipe of the circulating pipeline.

[0019] Preferably, the first heat source, the second heat source, and the third heat source are respectively connected to the circulating pipeline through three independent heat circulation pumps.

[0020] Preferably, the filter pipeline is arranged in parallel on one side of the secondary circulation pipeline, and the inlet end and outlet end of the filter pipeline are both connected to the secondary circulation pipeline. The inlet end is located upstream of the outlet end, and a shut-off valve is provided on the secondary circulation pipeline between the inlet end and the outlet end.

[0021] Preferably, it also includes an indoor temperature sensor and an outdoor temperature sensor, which are capable of providing data required for the on / off status of the first heat source, the second heat source, and the third heat source with respect to the circulating pipeline.

[0022] The present invention achieves the following technical advantages over the prior art:

[0023] In the multi-heat source heating unit disclosed in this utility model, the heat meter, in conjunction with the secondary network supply water temperature measuring device and the secondary network return water temperature measuring device, can obtain the actual heat consumption of the secondary network circulation pipeline in real time. Based on the actual heat consumption of the secondary network circulation pipeline, the heat source connected to the primary network circulation pipeline is switched. When the actual heat load of the pipeline network decreases, the system can switch to the cheaper heat source for heating in a timely manner, thereby maximizing the use of the cheaper heat source. At the same time, under the action of the dirt remover, impurities in the circulating water can be removed, reducing the resistance in the secondary network circulation pipeline, effectively reducing power consumption, and achieving the technical effect of reducing heating costs. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of one embodiment of the present invention.

[0026] The components include: 1. Primary network circulation pipeline; 2. Secondary network circulation pipeline; 3. User pipeline; 4. Heat meter; 5. Secondary network return water temperature measuring device; 6. Secondary network supply water temperature measuring device; 7. Electric regulating valve; 8. Secondary network temperature control pump; 9. Temperature control pump frequency converter; 10. Heat exchanger; 11. Control unit; 12. Primary network supply water pressure measuring device; 13. Primary network return water pressure measuring device; 14. Equalizing tank; 15. Indoor temperature sensor; 16. Outdoor temperature sensor; 17. 18. Primary water supply temperature measuring device; 19. Primary water return temperature measuring device; 20. Secondary water supply pump; 21. Water supply pump frequency converter; 22. Secondary water supply pressure measuring device; 23. Secondary water return pressure measuring device; 24. Heat exchanger outlet pipe; 25. Heat exchanger inlet pipe; 26. Air vent valve; 27. Sewage valve; 28. Gateway; 29. ​​Touch screen; 30. Heat exchanger outlet temperature transmitter; 31. Water distributor; 32. Water collector; 33. Sewage pump; 34. Sewage remover. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] The purpose of this invention is to provide a multi-heat source heating unit that obtains the actual heat consumption of the secondary circulation pipeline through a heat meter, and switches to a cheaper heat source in a timely manner to provide heating, thereby reducing heating costs.

[0029] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] refer to Figure 1The multi-heat source heating unit disclosed in this embodiment includes: a heat source, a primary circulation pipeline 1, a secondary circulation pipeline 2, and a filter pipeline. The heat source provides heat to the downstream pipeline network and includes a first heat source, a second heat source, and a third heat source. The cost and heating efficiency of the first, second, and third heat sources increase sequentially. The first, second, and third heat sources are respectively connected to the primary circulation pipeline 1 in a switchable manner. The side of the primary circulation pipeline 1 furthest from the heat source is connected to the secondary circulation pipeline 2 for heat exchange. Next, the side of the secondary circulation pipeline 2 away from the primary circulation pipeline 1 is connected to the user pipeline 3. A heat meter 4 is installed on the secondary circulation pipeline 2. A secondary water supply temperature measuring device 6 is installed on the water supply pipe of the secondary circulation pipeline 2. A secondary water return temperature measuring device 5 is installed on the water return pipe of the secondary circulation pipeline 2. Both the secondary water supply temperature measuring device 6 and the secondary water return temperature measuring device 5 are connected to the heat meter 4. The filter pipeline is connected to the secondary circulation pipeline 2. A dirt remover 33 for filtering dirt is installed on the filter pipeline. The secondary network supply water temperature measuring device 6 measures the supply water temperature of the secondary network, and the secondary network return water temperature measuring device 5 measures the return water temperature of the secondary network. Through the cooperation of the secondary network supply water temperature measuring device 6, the secondary network return water temperature measuring device 5, and the heat meter 4, the real-time heat consumption of the secondary network circulation pipeline 2 can be obtained. Based on this real-time heat consumption, the heat source connected to the primary network circulation pipeline 1 can be switched, enabling timely switching to a cheaper heat source when the actual heat load of the pipeline decreases, maximizing the use of cheaper heat sources for heating and reducing heating costs. Simultaneously, the real-time heat consumption of the secondary network circulation pipeline 2 can basically reflect the heat demand at the user end, meaning this application can switch heat sources according to the user's heat demand, ensuring heating effect while reducing costs. The circulating water in the secondary network circulation pipeline 2 can enter the filter pipeline, where impurities and dirt are removed by the dirt separator 33, thereby reducing resistance in the secondary network circulation pipeline and effectively reducing power consumption.

[0031] Of course, this application can also be configured with more than three heat sources as needed.

[0032] Preferably, both the secondary water supply temperature measuring device 6 and the secondary water return temperature measuring device 5 are temperature transmitters.

[0033] In a preferred embodiment, a sludge pump 32 is installed on the filter pipeline to accelerate the flow of circulating water in the secondary circulation pipeline 2 into the sludge separator 33, thereby improving the sludge removal efficiency. Preferably, the sludge separator 33 is a self-cleaning sludge separator, which can automatically discharge the filtered impurities outside the system when they accumulate to a certain level.

[0034] Those skilled in the art will understand that the primary circulation pipeline 1 and the secondary circulation pipeline 2 are connected through a heat exchange station for heat exchange.

[0035] Furthermore, a water supply temperature measuring device 17 is installed on the water supply pipe of the circulating pipeline 1, and a water return temperature measuring device 18 is installed on the water return pipe of the circulating pipeline 1.

[0036] In one preferred embodiment, an electrically operated regulating valve 7 is installed on the primary circulation pipeline 1 to control the unit flow rate of the primary circulation pipeline 1. For each heat source, after the heat source is put into operation or cut off, the pipeline parameters may not meet the flow rate requirements of the heat exchange station belonging to each heat source. By adjusting the opening degree of the electrically operated regulating valve 7, the flow area of ​​the primary circulation pipeline 1 can be adjusted to meet the flow rate requirements of the heat exchange station.

[0037] In a preferred embodiment, a secondary circulation pipeline 2 is equipped with a secondary circulation temperature control pump 8. This pump 8 can automatically adjust its speed or start / stop status according to changes in fluid temperature to adjust the flow rate of the circulating water in the secondary circulation pipeline 2, thereby adjusting the actual heat supply of the secondary circulation pipeline 2. It should be noted that each heat exchange station needs to regulate its heat supply according to real-time heat load. However, traditional units control the flow rate of the primary circulation pipeline 1 through an electric regulating valve 7, which in turn regulates the water supply temperature of the secondary circulation pipeline 2 to achieve heat supply regulation. In a multi-heat source network, the heating range of each heat source is determined by the balance between the flow rates of each heat source in the primary circulation pipeline 1. Therefore, the flow rate of the primary circulation pipeline 1 used to regulate the heat load interferes with the flow rate of the primary circulation pipeline 1 used to determine the heating range of the heat source, resulting in inaccurate regulation of the heat supply corresponding to the real-time heat load, and the heating range of the heat source cannot be determined as needed. This application uses the above-mentioned method to regulate the heat supply of the secondary circulation pipeline 2, which will not affect the flow rate of the primary circulation pipeline 1, thus ensuring precise regulation of the heat supply of the pipeline network.

[0038] Preferably, when the water supply temperature of the secondary circulation pipeline 2 does not meet the normal operation requirements of the secondary network temperature control pump 8, the secondary network temperature control pump 8 can automatically adjust the secondary network water supply temperature. After the adjustment is completed, the valve position of the electric regulating valve 7 does not change, thus avoiding the hydraulic stability problem of the primary circulation pipeline 1.

[0039] Furthermore, a secondary water supply pump 19 is installed on the water supply pipe of the secondary circulation pipeline 2. The secondary water supply pump 19 is used to supply circulating water into the secondary circulation pipeline 2. By adopting a dual-pump structure and operation mode of the secondary temperature control pump 8 and the secondary water supply pump 19, the heat supply regulation is no longer achieved by adjusting the flow rate of the primary circulation pipeline 1 to control the water supply temperature of the secondary circulation pipeline 2. Furthermore, the secondary water supply pump 19 is connected to the water supply pump frequency converter 20.

[0040] Preferably, the secondary water supply pump 19 is located upstream of the secondary water supply temperature measuring device 6.

[0041] More preferably, the multi-heat source heating unit of the multi-heat source network also includes a temperature control pump frequency converter 9 for controlling the operating frequency of the secondary network temperature control pump 8.

[0042] In a preferred embodiment, the primary circulation pipeline 1 and the secondary circulation pipeline 2 are connected by a heat exchanger 10.

[0043] Preferably, the heat exchanger 10 includes, but is not limited to, shell-and-tube heat exchangers, plate heat exchangers, and coaxial heat exchangers.

[0044] In a preferred embodiment, the system also includes a control unit 11, to which the first heat source, second heat source, third heat source, secondary network water supply temperature measuring device 6, secondary network return water temperature measuring device 5, and heat meter 4 are all connected. The control unit 11 can monitor and control the operating status of each structure and collect and summarize the signals measured by each structure.

[0045] In a preferred embodiment, a water supply pressure measuring device 12 is installed on the water supply pipe of the first network circulation pipeline 1, and a water return pressure measuring device 13 is installed on the water return pipe of the first network circulation pipeline 1; a water supply pressure measuring device 21 is installed on the water supply pipe of the second network circulation pipeline 2, and a water return pressure measuring device 22 is installed on the water return pipe of the second network circulation pipeline 2.

[0046] The pressure measuring device 12 for primary water supply, the pressure measuring device 13 for primary water return, the pressure measuring device 21 for secondary water supply, and the pressure measuring device 22 for secondary water return are all pressure transmitters.

[0047] In a preferred embodiment, the first heat source, the second heat source, and the third heat source are respectively connected to a circulating pipeline 1 via three independent heat circulation pumps.

[0048] In a preferred embodiment, a pressure equalization tank 14 is installed on the secondary network circulation pipeline 2. The inlet of the pressure equalization tank 14 supply water pipeline is connected to the outlet of the heat exchanger 10 through the heat exchanger outlet pipe 23. The inlet and outlet of the pressure equalization tank 14 supply water pipeline are connected to the supply pipe of the secondary network water supply pipeline. The inlet of the pressure equalization tank 14 return water pipeline is connected to the return water pipe of the secondary network water supply pipeline. The outlet of the pressure equalization tank 14 return water pipeline is connected to the inlet of the heat exchanger 10 through the heat exchanger inlet pipe 24. The pressure equalization tank 14 can maintain the stability of the system pressure.

[0049] In a preferred embodiment, the filter pipes are connected in parallel on one side of the secondary circulation pipe 2. Both the inlet and outlet ends of the filter pipes are connected to the secondary circulation pipe 2. Along the flow direction of the circulating water in the secondary circulation pipe 2, the inlet end is located upstream of the outlet end. Furthermore, a shut-off valve is installed on the secondary circulation pipe 2 between the inlet and outlet ends. When it is necessary to discharge the circulating water in the secondary circulation pipe 2, the shut-off valve is closed to prevent some of the circulating water from continuing to flow along the original path, thereby improving the efficiency of the discharge treatment.

[0050] Preferably, a heat exchanger outlet temperature transmitter 29 is installed on the heat exchanger outlet pipe 23.

[0051] Furthermore, the secondary network temperature control pump 8 is installed on the heat exchanger inlet pipe 24 between the heat exchanger 10 and the equalizing tank 14.

[0052] Preferably, the equalizing tank 14 includes an exhaust valve 25 for balancing pressure and a drain valve 26 for draining wastewater.

[0053] Preferably, the control unit 11 is connected to a mobile terminal and / or server via a gateway 27 to achieve remote control of the multi-heat source heating unit.

[0054] Furthermore, the control unit 11 also includes a touch screen 28, through which the control unit can be operated and information can be displayed.

[0055] As a preferred embodiment, a water distributor 30 is provided on the water supply pipe of the secondary circulation pipeline 2; furthermore, a water collector 31 is provided on the water return pipe of the secondary circulation pipeline 2.

[0056] Preferably, an exhaust valve is installed on the secondary circulation pipeline 2. The exhaust valve can promptly discharge the gas mixed in with the circulating water to ensure that the system can operate efficiently and safely.

[0057] As a preferred embodiment, an auxiliary heating device is provided on the secondary circulation pipeline 2. The auxiliary heating device can provide auxiliary heating to the secondary circulation pipeline 2 to ensure the heating needs of users.

[0058] In a preferred embodiment, an indoor temperature sensor 15 and an outdoor temperature sensor 16 are also included. These sensors provide data necessary to determine the on / off status of the first, second, and third heat sources and the primary circulation pipeline 1. Specifically:

[0059] (1) Estimate the heat consumption qhi of each heat exchange station based on the operating data. qhi is equal to the heat consumption of any day divided by 24, and then divided by the standard room temperature tn minus the average outdoor temperature of the corresponding 24 hours.

[0060] (2) Add up the heat consumption per degree-hour of all heat exchange stations, and the heat consumption per degree-hour of the entire system is qz = ∑qhi (unit: GJ / h℃).

[0061] (3) Based on the average outdoor temperature twp in the previous 24 hours and the heat consumption per degree-hour qz of the entire system, the hourly heat consumption of the entire system based on the average outdoor temperature in the previous 24 hours can be estimated as Qh = qz * (tn - twp). In practice, this heat consumption can be used as the total heat consumption Qz of the system for the next hour.

[0062] (4) According to the heat source situation, list the order of heat source input and cut-off based on the operation cost of the heat source.

[0063] First, make a list of heat sources (hourly heat supply): RY1(Q1), RY2(Q2), RY3(Q3)... etc. Here, RY1 is the heat source with the lowest cost.

[0064] Then, judge the hierarchical start and stop according to the total load demand and the load capacity of each heat source. The judgment method is as follows:

[0065] If Qz < Q1, the heat source RY1 operates;

[0066] If Qz > Q1, RY1 and RY2 operate, and the operating load Q2x of RY2 = Qz - Q1;

[0067] If Qz > Q1 + Q2, the operating load Q3x of RY3 = Qz - Q1 - Q2;

[0068] If Qz > Q1 + Q2 + Q3, the operating load Q4x of RY4 = Qz - Q1 - Q2 - Q3;

[0069] (5) According to the heat Q1, Q2, Q3... etc. obtained by each heat source, and according to the temperature difference △t at the outlet of each heat source at present, such as △t1, △t2, △t3... etc., calculate the target flow rates G1 = Q1 / △t1, G2 = Q2 / △t2, G3 = Q3 / △t3, etc. obtained by each heat source.

[0070] (6) According to the flow rates allocated to each heat source, respectively adjust the actual flow rates of the heat source circulation pumps to make the actual flow rates consistent with the target flow rates. ]>

[0071] (7) The outlet water temperatures of each heat source can be made different, and the range of heat exchange stations heated by the heat source can be determined according to the difference in the supply water temperature of the primary network of each heat exchange station. The reason why the heat source can operate at different outlet water temperatures is that each heat exchange station has the ability to independently adjust the heat supply according to the heat load.

[0072] (8) After distinguishing heat exchange stations with different inlet water temperatures by different heat source water temperatures, it is very easy to group these heat exchange stations belonging to different heat sources and calculate parameters such as total flow rate, total heat, valve opening, temperature control pump frequency, and room temperature for each group. This is not only used to verify the process of sequential start-up and shutdown of heat sources and the effect of heat load regulation, but also to assist in decision-making.

[0073] (9) The above process must be performed automatically once every hour. Only in this way can the use of cheap heat sources be maximized and operating costs saved.

[0074] As a preferred implementation, during the accessibility setting of the multi-heat source heating unit in the heat exchange station, the initial setting of the electric regulating valve 7 is performed under the conditions of the secondary network temperature control pump 8 operating at 100% speed and the secondary network water supply pump 19 at 100% design flow rate. The unit controller controls the valve position of the electric regulating valve 7. The setting value of the electric regulating valve 7 is the opening value of the electric regulating valve 7 under the condition that the actual supply temperature value tgs of the secondary network is consistent with the target supply temperature value tgj of the secondary network circulation pipeline 2. After the setting is completed, the valve position of the electric regulating valve 7 remains fixed until it is set again. The conditions for the second setting are the same as the first time, but the setting is only performed after the deviation between the actual supply temperature value tgs of the secondary network circulation pipeline 2 and the target supply temperature value tgj exceeds ±5%.

[0075] The target temperature value tgjd for underfloor heating is between 50 and 60℃, with a preferred value of 55℃; the target temperature value tgjg for wall heating is between 60 and 70℃, with a preferred value of 65℃.

[0076] As a preferred embodiment, when adjusting the actual temperature supply value of the secondary circulation pipeline 2, the secondary network temperature control pump 8 is at 100% speed, and the secondary network water supply pump 19 is at 100% of the design flow rate.

[0077] If the actual supply temperature tgs is less than the target supply temperature tgj-Δtg, and the time period T1 has elapsed, then the opening degree of the electric regulating valve 7 is FKD=FDK+2%.

[0078] If the actual supply temperature tgs is greater than the target supply temperature tgj+Δtg, and the time period T1 has elapsed, then the opening degree of the electric regulating valve 7 is FKD=FKD-2%.

[0079] Here, Δtg is the adjustment hysteresis, with a value range of 1 to 5℃, preferably 3℃; the time period T has a value range of 180s to 900s, with a preferred value of 300s.

[0080] As a preferred implementation, when the heating output of a multi-source heating unit is adjusted according to the room temperature of the heat users:

[0081] First, set the target room temperature. The upper limit of the target room temperature, tnjx, is in the range of 18 to 24°C, with 20°C being the preferred upper limit. The lower limit of the target room temperature, tnjn, is in the range of 16 to 22°C, with 18°C ​​being the preferred lower limit.

[0082] If the actual room temperature value tns is less than the target room temperature lower limit value tnjn, the temperature control pump will run at 100% speed; if the actual room temperature value tns is greater than the target room temperature upper limit value tnjx, the temperature control pump will run at 30% speed.

[0083] Furthermore, if the actual room temperature value tns is less than the target room temperature lower limit value tnjn, the temperature control pump will operate at 100% speed; if the actual room temperature value tns is between the target room temperature upper and lower limits, the temperature control pump will operate at 70% speed; if the actual room temperature value tns is greater than the target room temperature upper limit value tnjx, the temperature control pump will operate at 30% speed.

[0084] As a preferred implementation, the heat source flow rate is estimated after the heat load changes.

[0085] A heating company has two heat sources: heat source RY1 is a combined heat and power plant (CHP) with a heat price of 20 yuan per GJ; heat source RY2 is a gas-fired boiler with a heat price of 50 yuan per GJ. The supply water temperature of both heat sources is 90℃, the return water temperature is 50℃, and the temperature difference Δt = 40℃. RY1 has a heating capacity of 250 GJ per hour, and RY2 has a heating capacity of 150 GJ per hour. The entire heating system has 20 heat exchange stations, each with a heat consumption of 0.5 GJ per degree-hour, and a required room temperature of 20℃.

[0086] When the outside temperature is 0℃, the total heat consumption in the next hour is Qz=20*0.5*(20-0)=200GJ; therefore, only heat source RY1 needs to bear the heat load.

[0087] When the outside temperature is -10℃, the total heat consumption in the next hour is Qz = 20 * 0.5 * (20 - -10) = 300 GJ; then heat source RY1 bears Q1 = 250 GJ, and RY2 bears Q2 = 50 GJ.

[0088] Therefore, the flow rate of heat source RY1 can be calculated as G1 = Q1 / Δt = 1493 t / h; the flow rate of RY2 is G2 = Q2 / Δt = 298 t / h.

[0089] Therefore, it can be concluded that when the outside temperature is -10℃, the heating network should allocate the heating range of the heat source according to the flow rate of the circulating pump RY1 (1493t / h) and the flow rate of RY2 (298t / h).

[0090] As a preferred implementation, the opening degree of the electric valve is set.

[0091] A heat exchange station system uses underfloor heating, and it is necessary to adjust the opening degree of the electric regulating valve 7 when the secondary network water supply temperature is 55℃.

[0092] With the secondary network temperature control pump operating at 8100% speed and the water supply pump at 100% design flow rate, the target supply temperature of the secondary network is set to 55℃, Δtg = 3℃, and the cycle T is 300s. After a period of adjustment, the adjustment is completed when the actual supply temperature is within the range of 55℃ ± 2.75℃. After that, the valve position of the electric regulating valve 7 is fixed for a period of time.

[0093] As a preferred implementation method, the temperature control pump regulates room temperature using a three-flow method.

[0094] If the full flow rate speed of the temperature-controlled pump is 45Hz, then

[0095] If the actual room temperature value tns is less than the target room temperature lower limit value tnjn, the temperature control pump will run at 100% speed and the frequency of the frequency converter will be 45Hz.

[0096] If the actual room temperature value tns is between the upper and lower limits of the target room temperature, the temperature control pump will run at 70% speed and the frequency of the frequency converter will be 31.5Hz.

[0097] If the actual room temperature value tns is greater than the target room temperature upper limit value tnjx, the temperature control pump will run at 30% speed; the frequency of the frequency converter is 13.5Hz.

[0098] Furthermore, the speed of the secondary network temperature control pump 8 of this unit is related to the heat load. Therefore, when the heat load is not designed, the temperature control pump can operate at a low speed to save electricity, so this is a power saving unit.

[0099] Any adaptive changes made according to actual needs are within the protection scope of this utility model.

[0100] It should be noted that, for those skilled in the art, it is obvious that this utility model is not limited to the details of the above exemplary embodiments, and that this utility model can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. Therefore, the embodiments should be considered as exemplary and non-limiting in all respects, and the scope of this utility model is defined by the appended claims rather than the foregoing description. Therefore, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A multi-heat source heating unit, characterized in that, include: The first heat source, the second heat source, and the third heat source have successively increased costs and heating efficiency, and the first heat source, the second heat source, and the third heat source can provide heat to the downstream pipe network; A circulating pipeline (1) is provided, wherein the first heat source, the second heat source and the third heat source are respectively connected to the circulating pipeline (1) in a slewable manner; The second network circulation pipeline (2) is connected to the first network circulation pipeline (1) on one side for heat exchange, and the other side of the second network circulation pipeline (2) is connected to the user pipeline (3). A heat meter (4) is installed on the second network circulation pipeline (2), a second network water supply temperature measuring device (5) is installed on the water supply pipe of the second network circulation pipeline (2), and a second network return water temperature measuring device (6) is installed on the return water pipe of the second network circulation pipeline (2). The second network water supply temperature measuring device (5) and the second network return water temperature measuring device (6) are both connected to the heat meter (4). The heat meter (4) is used to provide data on the on / off status of the first heat source, the second heat source and the third heat source with the first network circulation pipeline (1). The filter pipeline is connected to the second-network circulation pipeline (2), and a dirt remover (33) for filtering dirt is provided on the filter pipeline.

2. The multi-heat source heating unit according to claim 1, characterized in that, An electric regulating valve (7) is installed on the circulating pipeline (1) to control the flow area of ​​the circulating pipeline (1).

3. The multi-heat source heating unit according to claim 1, characterized in that, The secondary circulation pipeline (2) is equipped with a secondary circulation temperature control pump (8) for controlling the flow rate of circulating water in the secondary circulation pipeline (2).

4. The multi-heat source heating unit according to claim 3, characterized in that, It also includes a temperature control pump inverter (9) for controlling the operating frequency of the second network temperature control pump (8).

5. The multi-heat source heating unit according to claim 1, characterized in that, The primary circulation pipeline (1) and the secondary circulation pipeline (2) are connected by a heat exchanger (10).

6. The multi-heat source heating unit according to claim 1, characterized in that, It also includes a control unit (11), and the first heat source, the second heat source, the third heat source, the secondary network water supply temperature measuring device (5), the secondary network return water temperature measuring device (6), and the heat meter (4) are all connected to the control unit (11).

7. The multi-heat source heating unit according to claim 1, characterized in that, A water supply pressure measuring device (12) is installed on the water supply pipe of the circulating pipeline (1), and a return water pressure measuring device (13) is installed on the return water pipe of the circulating pipeline (1).

8. The multi-heat source heating unit according to claim 6, characterized in that, The first heat source, the second heat source and the third heat source are respectively connected to the circulating pipeline (1) through three independent heat circulation pumps.

9. The multi-heat source heating unit according to claim 1, characterized in that, The filter pipeline is arranged in parallel on one side of the second network circulation pipeline (2). The inlet end and the outlet end of the filter pipeline are both connected to the second network circulation pipeline (2). The inlet end is located upstream of the outlet end. A shut-off valve is provided on the second network circulation pipeline (2) between the inlet end and the outlet end.

10. The multi-heat source heating unit according to claim 1, characterized in that, It also includes an indoor temperature sensor (15) and an outdoor temperature sensor (16), which are capable of providing data on the on / off status of the first heat source, the second heat source and the third heat source with the circulating pipeline (1).

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