Heat supply unit

Abstract

The utility model relates to a heat supply unit which comprises a heat source, a first-network circulation pipeline, a second-network circulation pipeline and a heat consumer building, wherein the heat source and the first-network circulation pipeline are communicated with each other; the second-network circulation pipeline is used for buffering or exchanging heat for the flow of the first-network circulation pipeline; an on-off device for controlling on-off of the first-net circulation pipeline or the second-net circulation pipeline is arranged on the first-net circulation pipeline or the second-net circulation pipeline, and a branch pipeline is arranged on the second-net circulation pipeline and comprises a sewage inlet and a filtered water outlet. The two-net circulating pipeline is sequentially communicated with a dirt removal pump and a dirt remover through a sewage inlet and is communicated with the two-net circulating pipeline through the filtered water outlet, and a third electric on-off valve is arranged on the two-net circulating pipeline and located between the sewage inlet and the filtered water outlet; the on-off device is arranged on the first-network circulating pipeline or the second-network circulating pipeline, and the sewage treatment device is arranged, so that the second-network circulating pipeline is subjected to sewage discharge on the basis of ensuring that the return water temperature is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the heating ventilation air conditioning technical field, especially relates to a heat supply unit. BACKGROUND

[0002] The lower the return water temperature is when the heat supply system is running, the higher the heat network transmission efficiency is, if the heat source is cogeneration, the waste heat can be used to increase the power generation efficiency of the cogeneration heat source, if the heat source is a gas boiler, the flue gas waste heat can be recovered to improve the boiler efficiency, therefore, the low return temperature is very important for the heat supply system and the heat source.

[0003] However, in practice, it is very difficult to reduce the return temperature of the heat supply system, and the current method for reducing the return water temperature known by the inventor is as follows:

[0004] (1) using an absorption heat pump to reduce the return water temperature of the network, but the absorption heat pump is expensive, occupies a large area of the heat exchange station, and the operation and maintenance difficulty is also great, therefore, it cannot be widely promoted.

[0005] (2) using an electric heat pump to reduce the return water temperature of the primary network, but the electric heat pump needs electricity, and the cost of the heat pump is also high, which belongs to a complex device with high operation and maintenance difficulty.

[0006] (3) the low return temperature can be realized by increasing the area of the heat dissipator of the heat user, but the heat dissipator has been installed in the heat user's home, it is difficult to increase the heat dissipation area, and the pipeline has been arranged, it is difficult to replace, therefore, this method is not feasible in practice.

[0007] (4) reducing the flow of the secondary network can reduce the return water temperature of the secondary network, and then reduce the return water temperature of the primary network, but reducing the flow will cause hydraulic disorder, therefore, it is also difficult to use in practice.

[0008] (5) the cascade heat exchange method is also a method for reducing the return temperature, that is, the primary outlet water of the hanging heating heat exchanger is used as the primary inlet water of the floor heating heat exchanger, so that the return water temperature of the heat network is close to the return water temperature of the floor heating system, and the return temperature of the primary network is reduced, but this method often causes interference between the floor heating system and the hanging heating system, and it is necessary to have both the hanging heating system and the floor heating system in a heat exchange station, therefore, it is not a good method.

[0009] Therefore, in view of the above technical problems, the heat supply unit is designed, the return water temperature can be reduced on the basis of reducing the cost, the transmission efficiency of the primary pipe network is effectively improved, the sewage treatment of the secondary circulating pipe is carried out, and the sewage treatment of the secondary circulating pipe is carried out, which is a technical problem to be solved by the person skilled in the art. UTILITY MODEL CONTENTS

[0010] In order to solve the above problems, the utility model provides a kind of heat supply unit, on the basis of reducing cost, the reduction of backwater temperature can be realized, and the transmission efficiency of primary pipe network is effectively improved, sewage treatment is carried out to secondary network circulation pipeline, and sewage is discharged to secondary network circulation pipeline.

[0011] To achieve the above object, the utility model provides the following scheme:

[0012] A kind of heat supply unit, including the heat source and the network circulation pipeline that are interconnected, the secondary network circulation pipeline for buffering or heat exchange of network circulation pipeline flow and the heat user building communicated with the secondary network circulation pipeline, the on-off device for controlling the on-off of network circulation pipeline or secondary network circulation pipeline is arranged on network circulation pipeline or secondary network circulation pipeline, branch pipeline is arranged on the secondary network circulation pipeline, the branch pipeline includes sewage inlet and filtered water outlet, the sewage pump, sewage remover are sequentially communicated with the secondary network circulation pipeline by sewage inlet, and the secondary network circulation pipeline is communicated with the secondary network circulation pipeline by the filtered water outlet, third electric on-off valve is arranged on the secondary network circulation pipeline between the sewage inlet and the filtered water outlet.

[0013] Preferably, the network circulation pipeline and the secondary network circulation pipeline are surrounded by the heat preservation layer for heat preservation of network circulation pipeline and secondary network circulation pipeline.

[0014] Preferably, the network circulation pipeline or secondary network circulation pipeline is provided with a backup pump.

[0015] Preferably, it further includes controller, gateway interface, room temperature and external temperature interface, first analog input interface, second analog input interface, analog output interface and RS485 interface are arranged on the controller, the gateway interface is connected with touch screen and gateway respectively, the room temperature and external temperature interface are connected with room temperature sensor and external temperature sensor respectively, the first analog input interface is connected or not connected with network circulation pipeline, the second analog input interface and the RS485 interface are connected with secondary network circulation pipeline, the analog output interface is connected with network circulation pipeline and secondary network circulation pipeline respectively.

[0016] Preferably, the two-network circulation pipeline comprises a two-network water supply pipe, a two-network water supply temperature transmitter and a two-network water supply pressure transmitter arranged in sequence on the two-network water supply pipe, a two-network return water pipe, and a two-network return water pressure transmitter, a two-network return water temperature transmitter, and a heat meter arranged in sequence on the two-network return water pipe, the two-network water supply pressure transmitter, the two-network water supply temperature transmitter, the two-network return water pressure transmitter, and the two-network return water temperature transmitter are connected with the second analog input interface, the heat meter is connected with the RS485 interface, and the two-network circulation pump is arranged on the two-network return water pipe or the two-network water supply pipe, and the two-network circulation pump is connected with the analog output interface through a two-network circulation pump frequency converter.

[0017] Preferably, the one-network circulation pipeline comprises a one-network water supply pipe, a one-network water supply pressure transmitter and a one-network water supply temperature transmitter arranged in sequence on the one-network water supply pipe, a one-network return water pipe, and a one-network return water temperature transmitter and a one-network return water pressure transmitter arranged in sequence on the one-network return water pipe, and the one-network water supply pressure transmitter, the one-network water supply temperature transmitter, the one-network return water pressure transmitter, and the one-network return water temperature transmitter are connected with the first analog input interface.

[0018] Preferably, the heat source is a first gas boiler, the controller further comprises a first on-off interface and a first gas boiler temperature setting interface, the first analog input interface is not connected with the one-network circulation pipeline, the on-off device is a first gas boiler controller arranged on the first gas boiler, the first gas boiler controller is connected with the first gas boiler temperature setting interface, the first gas boiler is provided with a first gas boiler controller connected with the first on-off interface, the one-network circulation pipeline comprises a first gas boiler water outlet pipe and a first gas boiler return water pipe, and the two-network circulation pump is arranged between the first gas boiler and the heat meter.

[0019] Preferably, the on-off device is a second electric on-off valve arranged on the one-network circulation pipeline, a mixing water pipe is arranged between the one-network circulation pipeline and the two-network circulation pipeline, a check valve is arranged on the mixing water pipe, the heat source is a first heating device, a second electric regulating valve and the second electric on-off valve are arranged in sequence between the one-network water supply temperature transmitter and the check valve, and the two-network circulation pump is arranged between the check valve and the two-network water supply temperature transmitter.

[0020] Preferably, the one-network circulation pipeline and the two-network circulation pipeline exchange heat through a heat exchanger.

[0021] Preferably, the heat source is a second heating device, the on-off device is a first electric on-off valve arranged on the one-network circulating pipeline, and the first electric on-off valve and the first electric regulating valve are arranged between the one-network water supply temperature transmitter and the heat exchanger.

[0022] Preferably, the heat source is a third heating device, the on-off device is a one-network distribution pump arranged on the one-network circulating pipeline, the one-network distribution pump is arranged between the one-network return water temperature transmitter and the heat exchanger, and the one-network distribution pump is connected with the analog output interface through a one-network distribution pump frequency converter.

[0023] Preferably, the heat source is a second gas boiler, the controller further comprises a second switching quantity interface and a second gas boiler temperature setting interface, the on-off device is a second gas boiler controller arranged on the second gas boiler, the second gas boiler controller is connected with the second switching quantity interface, the second gas boiler temperature setting interface is connected with a second gas boiler temperature interface arranged on the second gas boiler, a one-network circulating pump is arranged between the one-network return water pressure transmitter and the second gas boiler, and the one-network circulating pump is connected with the analog output interface through a one-network circulating pump frequency converter.

[0024] The utility model discloses relative to prior art has obtained following technical effect:

[0025] By arranging the on-off device on the one-network circulating pipeline or the two-network circulating pipeline, when the actual return temperature value of the two-network circulating pipeline is too high, the on-off device is disconnected, the actual return temperature value of the two-network circulating pipeline is reduced, the stable transmission in the two-network circulating pipeline is given to the heat user, and the return water temperature is reduced, the return water temperature is reduced on the basis of reducing the cost, the transmission efficiency of the one-network pipeline is effectively improved, and the branch pipeline is arranged on the two-network circulating pipeline, and sewage treatment is carried out on the two-network circulating pipeline, so that the return water temperature is reduced, and the two-network circulating pipeline is discharged on the basis of guaranteeing the return water temperature. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical scheme in the utility model or prior art, the following will briefly introduce the drawings needed to be used in the embodiment, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to the drawings without paying creative labor.

[0027] ATTACHMENT Figure 1 The whole structure schematic diagram of heat supply unit between the heat supply unit centralized heat sources disclosed in the embodiment of the utility model is shown in the figure.

[0028] ATTACHMENT Figure 2The utility model discloses a heat supply unit centralized heat source distribution type pump unit overall structure schematic diagram for the embodiment of the utility model discloses a heat supply unit centralized heat source distribution type pump unit overall structure schematic diagram.

[0029] Attached Figure 3 The utility model discloses a heat supply unit centralized heat source mixed water unit overall structure schematic diagram for the embodiment of the utility model discloses a heat supply unit centralized heat source mixed water unit overall structure schematic diagram.

[0030] Attached Figure 4 The utility model discloses a heat supply unit gas boiler interval supply system overall structure schematic diagram for the embodiment of the utility model discloses a heat supply unit gas boiler interval supply system overall structure schematic diagram.

[0031] Attached Figure 5 The utility model discloses a heat supply unit gas boiler direct supply unit overall structure schematic diagram for the embodiment of the utility model discloses a heat supply unit gas boiler direct supply unit overall structure schematic diagram.

[0032] Among them, 1, touch screen, 2, gateway, 3, gateway interface, 4, controller, 5, second analog input interface, 6, first switch quantity interface, 7, first analog input interface, 8, analog output interface, 9, RS485 interface, 10, one network water supply pressure transmitter, 11, one network water supply pipe, 12, one network water supply temperature transmitter, 13, one network return water pressure transmitter, 14, one network return water temperature transmitter, 15, one network return water pipe, 16, one network circulating pump frequency converter, 17, one network circulating pump, 18, first gas boiler, 19, first electric regulating valve, 20, first electric on-off valve, 21, first gas boiler controller, 22, first gas boiler temperature setting interface, 23, heat exchanger, 24, second network circulating pump frequency converter, 25, second network circulating pump, 26, heat meter, 27, second network water supply pipe, 28, second network return water pipe, 29, second network water supply temperature transmitter, 30, second network water supply pressure transmitter, 31, second network return water temperature transmitter, 32, second network return water pressure transmitter, 33, heat user building, 34, one network distribution pump, 35, one network distribution pump frequency converter, 36, mixed water pipe, 37, check valve, 38, second electric regulating valve, 39, second electric on-off valve, 40, room temperature and external temperature interface, 41, external temperature sensor, 42, room temperature sensor, 43, first gas boiler outlet pipe, 44, first gas boiler return pipe, 45, first gas boiler temperature setting interface, 46, second gas boiler, 47, second gas boiler controller, 48, second gas boiler temperature interface, 49, second switch quantity interface, 50, second gas boiler temperature setting interface, 51, dirt removal pump, 52, dirt removal device, 53, standby pump, 54, third electric on-off valve. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0034] The utility model discloses a heat supply unit, on the basis of reducing cost, can realize the reduction of backwater temperature, and effectively improve the transmission efficiency of primary pipe network.

[0035] In order to make the above-mentioned purpose, features and advantages of the utility model more apparent, obvious and easy to understand, the utility model will be further described in detail below with reference to the drawings and specific embodiments.

[0036] Reference Figures 1-5 The heat supply unit disclosed in the embodiments of the utility model comprises at least a heat source and a network circulation pipeline in communication, a two-network circulation pipeline for buffering or heat exchanging the flow of the network circulation pipeline and a heat user building in communication with the two-network circulation pipeline, a on-off device for controlling the on-off of the network circulation pipeline or the two-network circulation pipeline is arranged on the network circulation pipeline or the two-network circulation pipeline, a branch pipeline comprising a sewage inlet and a filtered water outlet is arranged on the two-network circulation pipeline, a sewage pump and a sewage remover are sequentially connected in communication with the two-network circulation pipeline through the sewage inlet, and the two-network circulation pipeline is in communication with the two-network circulation pipeline through the filtered water outlet, a third electric on-off valve is arranged on the two-network circulation pipeline between the sewage inlet and the filtered water outlet, when the actual back temperature value of the two-network circulation pipeline is too high, the on-off device is disconnected, the actual back temperature value of the two-network circulation pipeline is reduced, the stable transmission in the two-network circulation pipeline is given to the heat user, and then the backwater temperature is reduced, on the basis of reducing cost, the backwater temperature can be reduced, the transmission efficiency of the primary pipe network is effectively improved, and the sewage in the two-network circulation pipeline is discharged on the basis of ensuring the reduction of the backwater temperature.

[0037] It should be noted that the branch pipeline is arranged on the two-network backwater pipe 28, the sewage pump 51 extracts the backwater of the two-network backwater pipe 28, the water is sent back to the two-network backwater pipe 28 after being filtered and decontaminated by the sewage remover 52, and compared with the sewage remover in series connection on the backwater pipe, the active decontamination device can reduce the secondary side resistance in the heat exchanging station and effectively reduce the power consumption.

[0038] Reference Figures 1-5As an implementation, the one-network circulation pipeline and the two-network circulation pipeline are surrounded by an insulation layer for insulating the one-network circulation pipeline and the two-network circulation pipeline.

[0039] With reference to Figures 1-5 As an implementation, a standby pump 53 is arranged on the one-network circulation pipeline or the two-network circulation pipeline, and when the pump group in the one-network circulation pipeline or the two-network circulation pipeline fails, the standby pump 53 can work.

[0040] With reference to Figures 1-5 As an implementation, the heat supply unit further comprises a controller 4, the controller 4 is provided with a gateway interface 3, a room temperature and outdoor temperature interface 40, a first analog input interface 7, a second analog input interface 5, an analog output interface 8 and an RS485 interface 9, the gateway interface 3 is connected with the touch screen 1 and the gateway 2 respectively, the room temperature and outdoor temperature interface 40 is connected with a room temperature sensor 42 and an outdoor temperature sensor 41 respectively, the first analog input interface 7 is connected with or not connected with the one-network circulation pipeline, the second analog input interface 5 and the RS485 interface 9 are connected with the two-network circulation pipeline, the analog output interface 8 is connected with the one-network circulation pipeline and the two-network circulation pipeline respectively, and through the controller 4, the pressure, temperature, cumulative heat, cumulative flow, instantaneous heat and instantaneous flow of the one-network circulation pipeline and the two-network circulation pipeline, the frequency of the two-network circulation pump 25, the outdoor temperature and the room temperature, and the on-off and opening degree of the valves arranged on the one-network circulation pipeline and the two-network circulation pipeline can be controlled.

[0041] With reference to Figures 1-5 As an implementation, the two-network circulation pipeline comprises a two-network water supply pipeline 27, a two-network water supply temperature transmitter 29 and a two-network water supply pressure transmitter 30 arranged on the two-network water supply pipeline 27 in sequence, a two-network return water pipeline 28, and a two-network return water pressure transmitter 32, a two-network return water temperature transmitter 31 and a heat meter 26 arranged on the two-network return water pipeline 28 in sequence, the two-network water supply pressure transmitter 30, the two-network water supply temperature transmitter 29, the two-network return water pressure transmitter 32 and the two-network return water temperature transmitter 31 are connected with the second analog input interface 5, the heat meter 26 is connected with the RS485 interface 9, and the two-network circulation pipeline further comprises a two-network circulation pump 25, the two-network circulation pump 25 is arranged on the two-network return water pipeline 28 or the two-network water supply pipeline 27, and the two-network circulation pump 25 is connected with the analog output interface 8 through a two-network circulation pump 25 frequency converter 24, through arranging the pressure transmitter, the temperature transmitter and other components on the two-network circulation pipeline, the pressure and temperature of the two-network circulation pipeline can be controlled and monitored through the controller 4.

[0042] With reference to Figures 1-4As an implementation, a network circulation pipeline includes a network water supply pipe 11, a network water supply pressure transmitter 10 and a network water supply temperature transmitter 12 arranged in sequence on the network water supply pipe 11, a network return pipe 15, and a network return temperature transmitter 14 and a network return pressure transmitter 13 arranged in sequence on the network return pipe 15, the network water supply pressure transmitter 10, the network water supply temperature transmitter 12, the network return pressure transmitter 13 and the network return temperature transmitter 14 are connected with the first analog input interface 7, by arranging the pressure transmitter, the temperature transmitter and other components on the network circulation pipeline, the pressure, the temperature and other parameters of the network circulation pipeline can be controlled and monitored by the controller 4.

[0043] Reference Figure 5 As an implementation, the heat source is a first gas boiler 18, the controller 4 further includes a first switch interface 6 and a first gas boiler temperature setting interface 45, the first analog input interface 7 is not connected with the network circulation pipeline, the on-off device is a first gas boiler controller 21 arranged on the first gas boiler 18, the first gas boiler controller 21 is connected with the first gas boiler temperature setting interface 22, the first gas boiler 18 is provided with the first gas boiler controller 21 connected with the first switch interface 6, the network circulation pipeline includes a first gas boiler water outlet pipe 43 and a first gas boiler return pipe 44, the second network circulation pump 25 is arranged between the first gas boiler 18 and a heat meter 26, and this is a gas boiler direct heating unit;

[0044] When the return water temperature needs to be controlled, after the unit is normally operated, the controller 4 can collect real-time operation data of the unit: the pressure, the temperature, the cumulative heat, the cumulative flow, the instantaneous heat and the instantaneous flow of the network circulation pipeline and the second network circulation pipeline, the frequency of the second network circulation pump 25, the state of the first gas boiler 18, the outdoor temperature and the room temperature.

[0045] The operation method for reducing the return temperature of the gas boiler direct heating unit is realized by the following steps:

[0046] S1: determining the gas boiler temperature when the actual supply temperature of the second network circulation pipeline is the target supply temperature:

[0047] Under the condition that the network circulation pipeline and the second network circulation pump 25 are at 100% design flow, the water outlet temperature of the first gas boiler 18 is the target supply temperature, here, the target supply temperature value tgd of the floor heating is in the range of 50-60℃, and the preferred value is 55℃, and the target supply temperature value tgg of the floor heating is in the range of 60-70℃, and the preferred value is 65℃;

[0048] S2: Set the upper and lower limits of the return water temperature, the upper limit of the target return temperature of the floor heating thdx is in the range of 20-40℃, the lower limit thdn is in the range of 20-40℃, the preferred values are thdx=30℃ and thdn=20℃; the upper limit of the target return temperature of the wall heating thgx is in the range of 25-40℃, the lower limit thgn is in the range of 25-40℃, the preferred values are thgx=40℃ and thgn=25℃;

[0049] S3: Set the target room temperature, the upper limit of the target room temperature tnx is in the range of 18-24℃, the preferred value is 20℃; the lower limit of the target room temperature tnn is in the range of 16-22℃, the preferred value is 18℃;

[0050] S4: Start and stop the first gas boiler 18 to control the return temperature of the two-network circulation pipeline;

[0051] If the actual return temperature value is higher than the lower limit of the target return temperature value, the first gas boiler 18 is stopped, and the actual return temperature value is waited to be lower than the lower limit of the target return temperature value;

[0052] If the actual return temperature value is lower than the lower limit of the target return temperature value, the first gas boiler 18 is started, and the actual return temperature value is waited to be higher than the upper limit of the target return temperature value;

[0053] S5: If the actual room temperature value tns is lower than the lower limit of the target room temperature value tnn, the lower limit of the return temperature is changed, thdn=floor heating thdx-Δth, thgn=wall heating thgx-Δth, where Δth is in the range of 2-5℃, and the preferred value is 3℃;

[0054] If the actual room temperature value tns is higher than the upper limit of the target room temperature value tnx, the lower limit of the return temperature is thdn(floor heating) and thgn(wall heating).

[0055] Reference Figure 3 In an embodiment, the on-off device is a second electric on-off valve 39 arranged on the one-network circulation pipeline, a mixing water pipe 36 is arranged between the one-network circulation pipeline and the two-network circulation pipeline, a check valve 37 is arranged on the mixing water pipe 36, the heat source is a first heating device, a second electric regulating valve 38 and the second electric on-off valve 39 are sequentially arranged between the one-network water supply temperature transmitter 12 and the check valve 37, and the two-network circulation pump 25 is arranged between the check valve 37 and the two-network water supply temperature transmitter 29, which is a centralized heat source mixing water unit;

[0056] When the return water temperature needs to be controlled, after the unit is normally operated, the controller 4 can collect the real-time operation data of the unit: the pressure, temperature, cumulative heat, cumulative flow, instantaneous heat and instantaneous flow of the one-network circulation pipeline and the two-network circulation pipeline, the frequency of the two-network circulation pump 25, the opening degree of the second electric regulating valve 38, the state of the second electric on-off valve 39, the outdoor temperature and the room temperature.

[0057] The operation method for reducing the return temperature of the centralized heat source direct supply mixed water heating unit is realized by the following steps:

[0058] S1: determining the valve opening of the second electric regulating valve 38 when the two-network high supply temperature is determined

[0059] Under the conditions that the second electric on-off valve 39 is open and the two-network circulating pump 25 is at 100% design flow, the controller 4 controls the valve position of the second electric regulating valve 38 to determine the supply temperature opening of the second electric regulating valve 38 under the condition that the actual supply temperature value of each heat exchange station is consistent with the target supply temperature value of the two-network circulating pipeline. After the determination is completed, the valve position of the second electric regulating valve 38 is fixed and does not move. The next determination condition is that the deviation between the actual two-network circulating pipeline supply temperature value and the target supply temperature value is ±10%. Here, the target ground heating supply temperature value tgd is in the range of 50-60℃, and the preferred value is 55℃. The target heating hanging supply temperature value tgg is in the range of 60-70℃, and the preferred value is 65℃.

[0060] S2: setting the upper and lower limit values of the two-network circulating pipeline return temperature. The upper limit value of the target ground heating return temperature thdx is in the range of 20-40℃, and the lower limit value thdn is in the range of 20-40℃. The preferred values are thdx=30℃ and thdn=20℃. The upper limit value of the target heating hanging return temperature thgx is in the range of 25-40℃, and the lower limit value thgn is in the range of 25-40℃. The preferred values are thgx=40℃ and thgn=25℃.

[0061] S3: setting the target room temperature. The upper limit value of the target room temperature tnx is in the range of 18-24℃, and the preferred upper limit value is 20℃. The lower limit value of the target room temperature tnn is in the range of 16-22℃, and the preferred value is 18℃.

[0062] S4: adjusting the two-network circulating pipeline return temperature by opening and closing the second electric on-off valve 39.

[0063] If the actual return temperature value is higher than the upper limit value of the target return temperature, the second electric on-off valve 39 is closed, and the actual return temperature value is waited to be lower than the lower limit value of the target return temperature.

[0064] If the actual return temperature value is lower than the lower limit value of the target return temperature, the second electric on-off valve 39 is open, and the actual return temperature value is waited to be higher than the upper limit value of the target return temperature.

[0065] S5: if the actual room temperature value tns is lower than the lower limit value of the target room temperature tnn, the lower limit value of the return temperature is changed, thdn=thdx-Δth (ground heating), and thgn=thgx-Δth (heating hanging). Here, the value of Δth is in the range of 2-5℃, and the preferred value is 3℃.

[0066] If the actual room temperature value tns is higher than the target room temperature upper limit value tnx, then the lower limit value for temperature recovery is thdn (underfloor heating) and thgn (wall heating).

[0067] refer to Figures 1-2 , Figure 4 In one embodiment, the primary circulation pipeline and the secondary circulation pipeline exchange heat through heat exchanger 23. By setting heat exchanger 23 to reduce the pressure and temperature of the primary circulation pipeline, the heat can be further adjusted and distributed according to the actual needs of the user, thereby improving the efficiency and safety of the entire heating system.

[0068] refer to Figure 1 In one implementation, the heat source is a second heating device, the on / off device is a first electric on / off valve 20 installed on the primary network circulation pipeline, a first electric regulating valve 19 and a first electric on / off valve 20 are sequentially installed between the primary network water supply temperature transmitter 12 and the heat exchanger 23, and a secondary network circulation pump 25 is installed between the heat exchanger 23 and the heat meter 26. This is a centralized heat source inter-supply unit.

[0069] When it is necessary to control the return water temperature, after the unit is running normally, the controller 4 can collect real-time operating data of the unit: pressure, temperature, cumulative heat, cumulative flow, instantaneous heat and instantaneous flow in the primary and secondary circulation pipelines, frequency of the secondary circulation pump 25, opening degree of the first electric regulating valve 19, status of the first electric on / off valve 20, and outdoor and indoor temperatures. At this time, the operation method for reducing the return water temperature of the centralized heat source heating unit is achieved by the following steps:

[0070] S1: To determine the valve opening of the first electric regulating valve 19 when the actual temperature supply matches the target temperature supply value of the secondary circulation pipeline, the controller 4 controls the valve position of the first electric regulating valve 19 under the condition that the second electric on / off valve 39 is on and the secondary circulation pump 25 is at 100% design flow. This determines the valve opening of the first electric regulating valve 19 under the condition that the actual temperature supply value of each heat exchange station matches the target temperature supply value of the secondary circulation pipeline. After determination, the valve position of the first electric regulating valve 19 is fixed until the next determination. The condition for the next determination is that the deviation between the actual temperature supply value of the secondary circulation pipeline and the target temperature supply value is ±10%. Here, the range of the target temperature supply value tgd for underfloor heating is 50-60℃, with a preferred value of 55℃; the range of the target temperature supply value tgg for wall heating is 60-70℃, with a preferred value of 65℃.

[0071] S2: Set the upper and lower limit values of the two-network circulating pipe return water temperature, the target return temperature upper limit value of the floor heating thdx is in the range of 20-40℃, the lower limit value thdn is in the range of 20-40℃, and the preferred values are thdx=30℃ and thdn=20℃; the target return temperature upper limit value of the hanging heating thgx is in the range of 25-40℃, the lower limit value thgn is in the range of 25-40℃, and the preferred values are thgx=40℃ and thgn=25℃;

[0072] S3: Set the target room temperature, the upper limit value of the target room temperature tnx is in the range of 18-24℃, and the preferred upper limit value is 20℃; the lower limit value of the target room temperature tnn is in the range of 16-22℃, and the preferred value is 18℃;

[0073] S4: First electric on-off valve 20 on-off regulation return temperature

[0074] If the actual return temperature value is higher than the target return temperature upper limit value, the first electric on-off valve 20 is off, and the actual return temperature value is waited to be lower than the target return temperature lower limit value;

[0075] If the actual return temperature value is lower than the target return temperature lower limit value, the first electric on-off valve 20 is on, and the actual return temperature value is waited to be higher than the target return temperature upper limit value;

[0076] S5: If the actual room temperature value tns is lower than the target room temperature lower limit value tnn, the return temperature lower limit value is changed, thdn=thdx-Δth (floor heating) and thgn=thgx-Δth (hanging heating), where Δth is in the range of 2-5℃, and the preferred value is 3℃;

[0077] If the actual room temperature value tns is higher than the target room temperature upper limit value tnx, the return temperature lower limit value is thdn (floor heating) and thgn (hanging heating).

[0078] Reference Figure 2 As an embodiment, the heat source is a third heating device, and the on-off device is a one-network distribution pump 34 arranged on the one-network circulating pipe, the one-network distribution pump 34 is arranged between the one-network return water temperature transmitter 14 and the heat exchanger 23, the one-network distribution pump 34 is connected with the analog output interface 8 through a one-network distribution pump frequency converter 35, and the two-network circulating pump 25 is arranged between the heat exchanger 23 and the heat meter 26, which is a centralized heat source distribution pump unit;

[0079] When the two-network return water temperature needs to be cooled, after the unit is normally operated, the controller 4 can collect the real-time operation data of the unit: the pressure, temperature, cumulative heat, cumulative flow, instantaneous heat and instantaneous flow of the one-network circulating pipe and the two-network circulating pipe, the frequency of the two-network circulating pump 25, the frequency of the one-network distribution pump 34, the outdoor temperature and the room temperature;

[0080] The operation method for reducing the return temperature of the heat supply unit supplied by the distribution pump of the central heat source is realized by the following steps:

[0081] S1: determining the upper limit frequency of the distribution pump when the actual supply temperature is consistent with the target supply temperature value of the two-network circulation pipeline

[0082] Under the condition of 100% design flow of the two-network circulation pump 25, the controller 4 controls the frequency change of the distribution pump, determines the upper limit value of the distribution pump frequency under the condition that the actual two-network circulation pipeline supply temperature value of each heat exchange station is consistent with the target two-network circulation pipeline supply temperature value, and saves the frequency value of the distribution pump in the controller 4 after the determination is completed. The next time the condition is that the actual two-network circulation pipeline supply temperature value deviates from the target supply temperature value by ±10% when the distribution pump operates under the condition of the upper limit frequency. Here, the target supply temperature value tgd of the floor heating is in the range of 50-60℃, and the preferred value is 55℃; the target supply temperature value tgg of the hanging heating is in the range of 60-70℃, and the preferred value is 65℃.

[0083] S2: setting the upper and lower limit values of the two-network return water temperature, the upper limit value thdx of the target return temperature of the floor heating is in the range of 20-40℃, and the lower limit value thdn is in the range of 20-40℃, and the preferred values are thdx=30℃ and thdn=20℃; the upper limit value thgx of the target return temperature of the hanging heating is in the range of 25-40℃, and the lower limit value thgn is in the range of 25-40℃, and the preferred values are thgx=40℃ and thgn=25℃.

[0084] S3: setting the target room temperature, the upper limit value tnx of the target room temperature is in the range of 18-24℃, and the preferred upper limit value is 20℃; the lower limit value tnn of the target room temperature is in the range of 16-22℃, and the preferred value is 18℃.

[0085] S4: changing the speed of the one-network distribution pump 34 to adjust the return temperature;

[0086] If the actual return temperature value is higher than the upper limit value of the target return temperature, the one-network distribution pump 34 is stopped, and the actual return temperature value is waited to be lower than the lower limit value of the target return temperature;

[0087] If the actual return temperature value is lower than the lower limit value of the target return temperature, the one-network distribution pump 34 operates under the condition of the upper limit frequency, and the actual return temperature value is waited to be higher than the upper limit value of the target return temperature;

[0088] S5: if the actual room temperature value tns is lower than the lower limit value tnn of the target room temperature, the lower limit value of the return temperature is changed, thdn=thdx-Δth (floor heating), and thgn=thgx-Δth (hanging heating), where Δth is in the range of 2-5℃, and the preferred value is 3℃;

[0089] If the actual room temperature value tns is higher than the upper limit value tnx of the target room temperature, the lower limit value of the return temperature is thdn (floor heating) and thgn (hanging heating).

[0090] The central heat source-pump distribution system of a certain cogeneration heat source needs to reduce the return water temperature of the network to below 40℃, so all heat exchange stations with heating are operated at a reduced return temperature. The temperature difference between the secondary supply and return water of these heat exchange stations is between 5-8℃, and the room temperature is required to be between 18-20℃. According to the demand, all existing units of N heat exchange stations in the heating system are to be modified into distribution pump inter-supply units with reduced return temperature, and corresponding unit control cabinets are to be configured, and low return temperature operation is to be realized according to the following method,

[0091] 1. Obtain the upper limit of the frequency of the network distribution pump 34 under balanced working conditions of the network

[0092] First, make the secondary network circulating pump 25 operate at 100% design flow condition, then set the target secondary network supply temperature of all heating heat exchange stations at 65℃, control the speed of the network distribution pump 34 to make the actual secondary network supply temperature consistent with the target supply temperature, with a deviation of less than ±5%, then save the operating frequency of the distribution pump, and use it as the upper limit of the operating frequency of the distribution pump.

[0093] 2. Set the upper and lower limit values of the target return temperature of the secondary network, the upper limit value of the target return temperature of the heating is 38℃, and the lower limit value is 28℃.

[0094] 3. Set the upper limit value of the target room temperature to 20℃, and the lower limit value of the target room temperature to 18℃.

[0095] 4. Change the speed of the network distribution pump 34 to adjust the return temperature

[0096] (1) If the actual room temperature value tns is higher than the upper limit value of the target room temperature 20℃, the lower limit value of the target return temperature is 28℃:

[0097] If the actual return temperature value ths is higher than the upper limit value of the target return temperature 38℃, the network distribution pump 34 is stopped, and then waits for the actual return temperature value ths to be lower than the lower limit value of the target return temperature 28℃;

[0098] If the actual return temperature value ths is lower than the lower limit value of the target return temperature 28℃, the network distribution pump 34 operates at the upper limit value of the frequency, and then waits for the actual return temperature value ths to be higher than the upper limit value of the target return temperature 38℃;

[0099] (2) If the actual room temperature value tns is lower than the lower limit value of the target room temperature 18℃: then change the lower limit value of the target return temperature, thdn = 38℃-3℃ = 35℃, here Δth takes a value range of 3℃:

[0100] If the actual return temperature value ths is higher than the upper limit value of the target return temperature 38℃, the network distribution pump 34 is stopped, and then waits for the actual return temperature value ths to be lower than the lower limit value of the target return temperature 35℃;

[0101] If the actual return temperature ths is lower than the lower limit of the target return temperature 35℃, the one-distribution pump 34 runs at the upper limit of the frequency, and then waits for the actual return temperature ths to be higher than the upper limit of the target return temperature 38℃;

[0102] It should be noted that:

[0103] (1) The process of the actual room temperature of the heat user increasing

[0104] When the actual room temperature is lower than the lower limit of the target room temperature 18℃, and the actual return water temperature is lower than the lower limit of the target return temperature 35℃, the one-distribution pump 34 runs at the upper limit of the frequency, and the two-network water supply temperature 65℃ hot water is sent into the secondary pipe network; then after a period of time, the actual return temperature of the two-network begins to rise, and when it exceeds the upper limit of the target return temperature of the two-network 38℃, the one-distribution pump 34 stops running; then the water supply temperature and the return temperature of the two-network tend to be consistent, and continue to circulate in the two-network, and the actual return temperature of the two-network continuously decreases, and when it is lower than the lower limit of the target return temperature 35℃, the above process continues until the actual room temperature is higher than the upper limit of the room temperature 20℃;

[0105] (2) The process of the actual room temperature of the heat user decreasing

[0106] When the actual room temperature is higher than the upper limit of the target room temperature 20℃, and the actual return water temperature is lower than the lower limit of the target return temperature 28℃, the one-distribution pump 34 runs at the upper limit of the frequency, and the two-network water supply temperature 65℃ hot water is sent into the secondary pipe network; then after a period of time, the actual return temperature of the two-network begins to rise, and when it exceeds the upper limit of the target return temperature of the two-network 38℃, the one-distribution pump 34 stops running; then the water supply temperature and the return temperature of the two-network tend to be consistent, and continue to circulate in the two-network, and the actual return temperature of the two-network continuously decreases, and when it is lower than the lower limit of the target return temperature 28℃, the above process continues until the actual room temperature is lower than the lower limit of the room temperature 18℃;

[0107] (3) It can be seen that the fluctuation range of the return temperature in the process of the room temperature of the heat user increasing is 35-38℃, and the average return temperature is 36.5℃; and in the process of the room temperature of the heat user decreasing, the fluctuation range of the return temperature is 28-38℃, and the average return temperature is 33℃, that is, when the actual room temperature is lower than 18℃, a room temperature increasing process is started; when the actual room temperature is higher than 20℃, a room temperature decreasing process is started, so the room temperature fluctuates between 18-20℃;

[0108] Reference Figure 4As an embodiment, the heat source is a second gas boiler 46, the controller 4 further comprises a second on-off interface 49 and a second gas boiler temperature setting interface 50, the on-off device is a second gas boiler controller 47 arranged on the second gas boiler 46, the second gas boiler controller 47 is connected with the second on-off interface 49, the second gas boiler temperature setting interface 50 is connected with a second gas boiler temperature interface 48 arranged on the second gas boiler 46, a one-net circulating pump 17 is arranged between the one-net circulating pump 17 and the second gas boiler 46, the one-net circulating pump 17 is connected with the analog output interface 8 through a one-net circulating pump 17 frequency converter 16, and the two-net circulating pump 25 is arranged between the heat exchanger 23 and the heat meter 26. This is a gas boiler inter-supply system.

[0109] When the two-net return water pipe 28 needs to be cooled, after the unit is normally operated, the controller 4 can collect real-time operation data of the unit: one-net circulating pipe and two-net circulating pipe pressure, temperature, cumulative heat, cumulative flow, instantaneous heat and instantaneous flow, two-net circulating pump 25 frequency, one-net circulating pump 17 frequency, second gas boiler 46 state, outdoor temperature and room temperature.

[0110] The operation method of the gas boiler inter-supply unit for reducing the return temperature is realized by the following steps:

[0111] S1: Determine the second gas boiler 46 temperature when the actual supply temperature of the two-net circulating pipe is the target supply temperature

[0112] Under the condition of 100% design flow of the one-net and two-net circulating pumps 25, the second gas boiler 46 outlet water temperature is controlled to make the actual supply temperature of the two-net circulating pipe reach the target supply temperature thereof;

[0113] Here, the range of the floor heating target supply temperature value tgd is 50-60℃, and the preferred value is 55℃; the range of the hanging heating target supply temperature value tgg is 60-70℃, and the preferred value is 65℃;

[0114] S2: Set the upper and lower limit values of the two-net return water temperature, the upper limit value of the floor heating target return temperature thdx is 20-40℃, and the lower limit value thdn is 20-40℃, and the preferred values are thdx=30℃ and thdn=20℃; the upper limit value of the hanging heating target return temperature thgx is 25-40℃, and the lower limit value thgn is 25-40℃, and the preferred values are thgx=40℃ and thgn=25℃;

[0115] S3: Set the target room temperature, the upper limit value of the target room temperature tnx is 18-24℃, and the preferred upper limit value is 20℃; the lower limit value of the target room temperature tnn is 16-22℃, and the preferred value is 18℃;

[0116] S4: the second gas boiler 46 is started or stopped to regulate the temperature of the second network

[0117] If the actual temperature is higher than the upper limit of the target temperature, the second gas boiler 46 is stopped, and the actual temperature is lower than the lower limit of the target temperature;

[0118] If the actual temperature is lower than the lower limit of the target temperature, the second gas boiler 46 is started, and the actual temperature is higher than the upper limit of the target temperature;

[0119] S5: if the actual room temperature tns is lower than the lower limit of the target room temperature tnn, the lower limit of the temperature is changed, thdn = thdx - Δth (floor heating), thgn = thgx - Δth (wall heating), wherein Δth is in the range of 2-5℃, and the preferred value is 3℃;

[0120] If the actual room temperature tns is higher than the upper limit of the target room temperature tnx, the lower limit of the temperature is thdn (floor heating) and thgn (wall heating).

[0121] The adaptive changes according to the actual needs are within the protection scope of the utility model.

[0122] It should be noted that for those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and the utility model can be realized in other specific forms without departing from the spirit or basic characteristics of the utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the utility model is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the utility model. Any reference signs in the claims should not be regarded as limiting the claims.

Claims

1. A heat supply unit, characterized in that, The system comprises a heat source and a first circulation pipeline, a second circulation pipeline for buffering or heat exchanging the flow of the first circulation pipeline, and a building connected with the second circulation pipeline, wherein the first or second circulation pipeline is provided with an on-off device for controlling the on-off of the first or second circulation pipeline, the second circulation pipeline is provided with a branch pipeline, the branch pipeline comprises a sewage inlet and a filtered water outlet, the second circulation pipeline is connected with a sewage removal pump and a sewage removal device in sequence through the sewage inlet, and is connected with the second circulation pipeline through the filtered water outlet, and a third electric on-off valve is arranged between the sewage inlet and the filtered water outlet of the second circulation pipeline.

2. The heating unit according to claim 1, characterized in that The system further comprises a controller, wherein the controller is provided with a gateway interface, a room temperature and external temperature interface, a first analog input interface, a second analog input interface, an analog output interface, and an RS485 interface, the gateway interface is connected with a touch screen and a gateway, the room temperature and external temperature interface is connected with a room temperature sensor and an external temperature sensor, the first analog input interface is connected with or not connected with the first circulation pipeline, the second analog input interface and the RS485 interface are connected with the second circulation pipeline, and the analog output interface is connected with the first and second circulation pipelines.

3. Heat supply unit according to claim 2, characterized in that The second circulation pipeline comprises a second water supply pipeline, a second water supply temperature transmitter and a second water supply pressure transmitter arranged in sequence on the second water supply pipeline, a second water return pipeline, and a second water return pressure transmitter, a second water return temperature transmitter, and a heat meter arranged in sequence on the second water return pipeline, the second water supply pressure transmitter, the second water supply temperature transmitter, the second water return pressure transmitter, and the second water return temperature transmitter are connected with the second analog input interface, the heat meter is connected with the RS485 interface, and the system further comprises a second circulation pump, which is arranged on the second water return pipeline or the second water supply pipeline and connected with the analog output interface through a second circulation pump frequency converter.

4. The heating unit according to claim 3, characterized in that The first circulation pipeline comprises a first water supply pipeline, a first water supply pressure transmitter and a first water supply temperature transmitter arranged in sequence on the first water supply pipeline, a first water return pipeline, and a first water return temperature transmitter and a first water return pressure transmitter arranged in sequence on the first water return pipeline, and the first water supply pressure transmitter, the first water supply temperature transmitter, the first water return pressure transmitter, and the first water return temperature transmitter are connected with the first analog input interface.

5. The heating unit according to claim 3, wherein The heat source is a first gas boiler, the controller further comprises a first on-off interface and a first gas boiler temperature setting interface, the first analog quantity input interface is not connected with the one-network circulating pipeline, the on-off device is a first gas boiler controller arranged on the first gas boiler, the first gas boiler controller is connected with the first gas boiler temperature setting interface, the first gas boiler is provided with a first gas boiler controller connected with the first on-off interface, the one-network circulating pipeline comprises a first gas boiler water outlet pipe and a first gas boiler water return pipe, and the two-network circulating pump is arranged between the first gas boiler and the heat meter.

6. The heating unit according to claim 4, wherein The on-off device is a second electric on-off valve arranged on the one-network circulating pipeline, a water mixing pipe is arranged between the one-network circulating pipeline and the two-network circulating pipeline, a check valve is arranged on the water mixing pipe, the heat source is a first heating device, a second electric regulating valve and the second electric on-off valve are sequentially arranged between the one-network water supply temperature transmitter and the check valve, and the two-network circulating pump is arranged between the check valve and the two-network water supply temperature transmitter.

7. The heating unit according to claim 4, wherein The one-network circulating pipeline and the two-network circulating pipeline exchange heat through the heat exchanger.

8. Heat supply unit according to claim 7, characterized in that The heat source is a second heating device, the on-off device is a first electric on-off valve arranged on the one-network circulating pipeline, and a first electric regulating valve and the first electric on-off valve are sequentially arranged between the one-network water supply temperature transmitter and the heat exchanger.

9. The heating unit according to claim 7, wherein The heat source is a third heating device, the on-off device is a one-network distribution pump arranged on the one-network circulating pipeline, the one-network distribution pump is arranged between the one-network water return temperature transmitter and the heat exchanger, and the one-network distribution pump is connected with the analog quantity output interface through a one-network distribution pump frequency converter.

10. The heating unit of claim 7, wherein The heat source is a second gas boiler, the controller further comprises a second on-off interface and a second gas boiler temperature setting interface, the on-off device is a second gas boiler controller arranged on the second gas boiler, the second gas boiler controller is connected with the second on-off interface, the second gas boiler temperature setting interface is connected with a second gas boiler temperature interface arranged on the second gas boiler, a one-network circulating pump is arranged between the one-network water return pressure transmitter and the second gas boiler, and the one-network circulating pump is connected with the analog quantity output interface through a one-network circulating pump frequency converter.

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