A heating pipe network system and a control method thereof

Abstract

The present invention discloses a heat supply pipe network system and a control method thereof, the system comprises a heat source plant end, a primary network, a heat exchange station, a secondary network, a plurality of heat user ends and a centralized control center, the heat exchange station is connected with the primary network and the secondary network respectively, the secondary network connects the heat exchange station and the heat user end; the two ends of the primary network are a water mixing end and a primary network heat exchange end respectively, the water mixing end is connected with the heat source plant end through a two-way water mixer, and a primary network water pump group is installed on the return pipe of the water mixing end; a circulation bypass is connected in parallel between the heat exchange water supply pipe and the heat exchange return pipe of the primary network, a first heat delivery regulating valve is installed on the circulation bypass, a second heat delivery regulating valve is installed between the circulation bypass and the heat exchange return pipe, the opening and closing states of the first heat delivery regulating valve and the second heat delivery regulating valve are negatively correlated, and a hydraulic regulating pump is installed downstream of the circulation bypass. The present invention can realize the flow control decoupling of the heat source plant end and the primary network side, realize the heat source plant end to adjust the flow according to the boiler demand, and the primary network side to adjust the flow according to the pipe network demand.

Description

Technical Field

[0001] The present invention relates to the technical field of heating systems, and in particular to a heating pipe network system and a control method thereof. Background Art

[0002] The existing heat network system architecture mainly adopts two forms: direct supply from one network and inter-network supply. During operation, a guaranteed system operation plan is usually set up to meet the needs of the most disadvantaged end users. As a result, it is inevitable that when the needs of disadvantaged end users are just met, there will be excessive heat supply to the favorable end users, and the energy consumption of the transmission process remains high. The specific manifestations are as follows:

[0003] The continuous high load of the pipe network leads to the waste of heat energy and excessive consumption of power and electricity. This has brought about a series of disadvantageous and difficult to solve system problems in the actual operation of the heating network, such as:

[0004] Due to the need for electricity, the heat source plant of cogeneration has a peak working period during the day and a low period at night. The heat generated is also more during the day and less at night. However, the heat demand of heat users is just the opposite. The heat demand is low during the day and peak at night. In the existing heating system, the heat network only plays a role in transportation. In order to ensure the hydraulic balance of the system, the principle of delivering as much heat as it gets is adopted, that is, the system is adjusted based on ensuring a relatively constant supply and return water temperature. However, due to the adverse effects of sunshine during the day and high temperature loss at night, it is inevitable that the heat source plant forms a heat demand that is opposite to its own peak and valley periods. Therefore, the way heat source plants usually solve this problem is: the waste heat during the day is released through cooling towers and other means, and the unit power is increased at night to produce more heat energy to meet the demand. The energy waste is huge.

[0005] The heat dissipation form of the heat user end is usually traditional wall-mounted heating or floor heating, which is a passive heat dissipation form and usually does not have the ability to change the heat dissipation power with the change of ambient temperature, that is, how much heat is dissipated. Therefore, when the heat supply of the heating network is higher than the required heat, it will inevitably cause excessive heat dissipation, which will not only affect the user's comfort, but also cause a waste of heat energy.

[0006] Due to the huge scope, scale and complex structure of the heating network system, the most difficult but most important thing to ensure in normal operation is hydraulic balance, that is, to adjust the pressure at different positions in the pipeline through the equipment in the pipeline network, so as to achieve the effective and balanced return of the heat source water in the water supply pipeline to the return pipeline after passing through each user end in the pipeline network, and further return to the heat source plant to realize circulation. Furthermore, through the above hydraulic action, the heat is effectively and on demand distributed to the heat users. To achieve this goal, it is usually necessary to repeatedly adjust the pumps, valves and other equipment on each line and branch at the beginning of each heating season to achieve the purpose of hydraulic balance in the system. With the changes of users, heat sources, environment and other factors every year, this complicated work must be carried out again in each heating season. Due to the structure of the existing heating pipeline network, the difficulty of this work may even make it difficult to achieve the optimal adjustment work throughout the heating season. Based on this, the existing heating system has to operate in a "minimum demand" mode, resulting in a large amount of energy waste. Summary of the invention

[0007] In order to solve the above problems, the purpose of the present invention is to disclose a heating pipe network system and a control method thereof, so as to solve the problems of unstable heating and difficult regulation in urban centralized heating.

[0008] The present invention is realized by the following technical scheme: a heat supply pipe network system, including a heat source plant end, a primary network, a heat exchange station, a secondary network, a plurality of heat user ends and a centralized control center, the heat exchange station is connected with the primary network and the secondary network respectively, the primary network connects the heat source plant end and the heat exchange station, and the secondary network connects the heat exchange station and the heat user end;

[0009] The two ends of the primary network are respectively a water mixing end and a primary network heat exchange end. The water mixing end is connected to the heat source plant end through a two-way water mixer. A primary network water pump group is installed on the return pipe of the water mixing end. The heat exchange end of the primary network is connected to the heat exchange station, which includes a heat exchange water supply pipe and a heat exchange return pipe. A circulation bypass is connected in parallel between the heat exchange water supply pipe and the heat exchange return pipe. A first heat supply regulating valve is installed on the circulation bypass. A second heat supply regulating valve is installed between the circulation bypass and the heat exchange return pipe. The opening and closing states of the first heat supply regulating valve and the second heat supply regulating valve are negatively correlated. A hydraulic regulating pump is installed downstream of the circulation bypass.

[0010] The centralized control center is respectively connected with the two-way water mixer, the primary network water pump group, the first heat supply regulating valve, the second heat supply regulating valve and the hydraulic regulating pump control.

[0011] The primary network of the heating pipe network refers to the main network connecting the heat source plant to the secondary network heat exchange station. As it drives the increase of heating area and user units, its scale is usually huge, and the difficulty of management and control also increases accordingly, that is, the longer the pipe network, the more users, the more complex the branch line, and the larger the number of equipment, the greater its hydraulic inertia, and the more difficult it is to control the process of adjusting the hydraulic balance. The management method of the primary network of the present invention is technically different from the prior art, and is intended to improve the high cohesion of "heat" and "hydraulic" in the primary network, so as to realize the high decoupling regulation and control method of "heat" and "hydraulic", set the primary network as a "water supply" + "return water" two-way channel, similar to the two-way lane of a highway, and regard the heat source plant and the secondary network heat exchange station as stations passing through the two-way channel. The control process is technically to realize the high decoupling regulation and control method of "heat" and "hydraulic" by transforming the inlet and outlet ramps of the two-way channel, and then realize the "heat" regulation under the premise of locking the "hydraulic" state, that is, under the premise of locking the hydraulic balance state, realize the decoupling regulation of heat. Through the above technical solution, the flow control decoupling between the heat source plant and the primary network is achieved, and the heat source plant adjusts the flow according to the boiler demand, and the primary network adjusts the flow according to the network demand, rather than the traditional premise of locking the primary network flow regulation on the boiler demand (power plant waste heat method) or adjusting the boiler state according to the demand of the primary network (boiler heating method). Its biggest advantage is that: under the power plant waste heat method, it solves the contradiction between the power plant boiler's high daytime and low nighttime operation mode and the heating demand of low daytime and high nighttime; under the boiler heating mode, the boiler can be operated in a relatively stable mode, rather than a large fluctuation adjustment operation of low daytime and high nighttime.

[0012] Furthermore, the heat source plant end includes a connected heat source water supply pipe, a boiler unit, a unit water pump group and a heat source return pipe, and a parallel water replenishment device is connected to the heat source return pipe.

[0013] Furthermore, the internal structure of the two-way water mixer is a full cavity or an adjustable orifice plate, which is respectively connected to the heat source water supply pipe, the boiler unit return pipe, the mixing end water supply pipe and the mixing end return pipe.

[0014] Through the above technical scheme, efficient heat exchange between the small circulation water circuit of boiler cooling at the heat source plant end and the large circulation water circuit on the primary network side is achieved. That is, when the flow rate on the primary network side is low, the heat in the small circulation of boiler cooling can be quickly exchanged to the large circulation water circuit on the primary network side to ensure the safe value of the boiler cooling water return temperature. In this process, due to the extremely large amount of water on the primary side, the heat exchanged by the small circulation of boiler cooling is absorbed and stored by the huge amount of water in the pipe network on the primary network side. Through the above technical scheme, the heat exchange capacity and heat saturation of the water mixer can be flexibly set according to the specific conditions of boiler operation and the heat network load of the season. Thereby, effective heat exchange between the small circulation of the heat source plant and the large circulation water system on the primary network side is achieved.

[0015] Furthermore, the secondary network includes a user heating end and a secondary network heat exchange end connected to the heat exchange station, a heat exchange bypass is connected in parallel to the secondary network heat exchange end, a heat exchange bypass valve is installed on the heat exchange bypass, a secondary network circulation pump is installed on the secondary network heat exchange end pipeline, a riser main valve is installed on the household pipeline between the secondary network and the heat user end, and the heat exchange bypass valve, the secondary network circulation pump and the riser main valve are respectively connected to the control of the centralized control center.

[0016] Through the above technical solution, the hydraulic balance of the secondary network is relatively stable when the heat users are stable, and its balance distribution adjustment can be completed quickly in a small range at the beginning of each heating season. The subsequent variable heating operation can be achieved through the variable adjustment method of the heat delivery of the primary network, which is a method of delivering as much heat as the heat received. Driven by the purpose of energy saving, the operating frequency of the secondary network circulation pump can be set as low as possible under the premise of ensuring the heat delivery amount to reduce energy consumption, and at the same time, it will not affect the hydraulic balance state in the secondary network 4.

[0017] Furthermore, the heat user end includes an inlet lock valve and a radiator which are connected in sequence on the pipeline, an indoor thermometer is installed on the radiator, the inlet lock valve is installed on the downstream branch line of the riser main valve, and the indoor thermometer is connected to the control of the centralized control center.

[0018] Through the above technical solution, the fine control of the water balance of the secondary network is achieved by terminal regulation, and the minimum regulation accuracy is refined to each household. The traditional mode of relying only on station area / front of building regulation is solved. It effectively avoids the insufficient heating of unfavorable ends such as bottom / top / edge households and the heat loss of oversupply of favorable end households sacrificed to protect unfavorable ends. It is the most powerful control to achieve energy saving.

[0019] A heating pipe network control method for any of the above heating pipe network systems, the control method comprising the following steps:

[0020] S1, the water mixing ratio control of the two-way water mixing end based on the heat exchange regulation between the primary network and the heat source plant, the heat is produced more during the peak power generation period, the water temperature of the primary network is t1, and the heat is delivered more during the low power consumption period, the water temperature of the primary network is t2, 80℃≤t2<t1≤130℃;

[0021] S2. Based on the primary network connecting the heat source plant and the heat exchange station, the main heat exchange pipeline and the circulation bypass ratio control are set in parallel at the heat exchange station. During the peak power consumption period, the circulation bypass with normal flow v% is opened and 1-v% of the main heat exchange pipeline is opened; during the low power consumption period, the circulation bypass with normal flow u% is opened and 1-u% of the main heat exchange pipeline is opened, 0≤u <v≤100。

[0022] S3. Based on the regulation of the circulation pump at the heat exchange station end of the secondary network connecting the heat exchange station end and the heat user end, the water temperature of the secondary network maintains a basically constant output during peak and low electricity consumption periods.

[0023] Through the above technical solution, the heat exchange pipeline is controlled by the second heat delivery regulating valve, and then the flow entering the plate heat exchange station from the primary network side is controlled, thereby realizing the control of the heat value transmitted from the primary side to the secondary side; the circulation bypass is supplemented by the first heat delivery regulating valve to open the excess flow blocked by the second heat delivery regulating valve, that is, the combined working mode (combined opening ratio) of the first heat delivery regulating valve and the second heat delivery regulating valve realizes the controllable adjustment of the heat value output from the primary side to the secondary side under the condition that the flow entering the current station area from the primary side remains unchanged. The decoupling of flow and heat in the regulation work of the heat exchange station from the primary side to the secondary side is realized, and the heat is regulated under the premise of unchanged flow, thereby solving the hydraulic balance impact of the primary side output regulation on the primary side network in the traditional heat exchange station, and laying a good foundation for the realization of on-demand regulation, high-frequency regulation, and location regulation.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] 1. Explore the unfavorable characteristics of "thermal inertia", magnify and fully utilize it, and then realize the scheduling mechanism of flexible throughput of heat energy in the heat network. Its purpose is to achieve the most optimized function and efficiency of the heat network operation with minimal investment and management links;

[0026] 2. The present invention greatly reduces the requirements for the heat source plant, changing it from on-demand regulation to follow-the-trend operation, freely outputting heat energy, greatly reducing the requirements for the operation of the heat source plant, the difficulty of system regulation and the scheduling frequency; the heat energy is delivered to the primary network at any time, and there is no need to release excess heat energy through the cooling tower, which greatly saves energy consumption;

[0027] 3. The present invention enables the primary network to achieve adaptive heat input and controllable output while maintaining its own hydraulic balance. Specifically, the primary network, while assuming the role of transmitting heat energy, also becomes a "heat pool" for storing heat energy with a huge capacity. Technically, it realizes the elastic throughput of heat energy, that is, it solves the problem of peak-valley time-staggering of thermoelectric heat sources, and also provides adaptive reception and storage of heat energy for asynchronous peak-valley of multiple heat sources in the same pipe network.

[0028] 4. The present invention clearly decouples the regulation relationship between hydraulic power and thermal energy on the primary side, thereby realizing a controllable heat output mode of the primary network to the secondary network; and based on the real-time regulation function of the heat supply regulating valve group of the primary network, a high-frequency regulation action can be used to finely respond to the heating effect under the influence of weather, sunshine, environment, etc.; that is, the stable comfort of the room temperature is effectively improved, and the huge energy consumption caused by excessive heat release is more effectively saved;

[0029] 5. The operation and management model brought about by the integrated and complementary centralized control center that adjusts the network according to demand and transforms storage according to load is an effective way to centrally regulate systemic problems. It reduces the workload and difficulty of on-site operation and maintenance personnel, and realizes intelligent scheduling of the system from a global perspective at a higher level, thus elevating management methods to a new level. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of the heating pipe network system of the present invention;

[0031] Figure 2 This is a schematic diagram of the heat source plant structure of the present invention;

[0032] Figure 3 It is a schematic diagram of the structure of the heat exchange station in the present invention;

[0033] Figure 4 This is a schematic diagram of the thermal user terminal structure of the present invention.

[0034] In the figure, 1, heat source plant end; 11, two-way water mixer; 12, heat source water supply pipe; 13, boiler unit; 14, unit water pump group; 15, heat source return pipe; 16, water replenishment device; 2, primary network; 21, water mixing end; 22, primary network heat exchange end; 221, heat exchange water supply pipe; 222, heat exchange return pipe; 23, return pipe; 24, primary network water pump group; 25, circulation bypass; 26, first delivery Heat regulating valve; 27. Second heat supply regulating valve; 28. Hydraulic regulating pump; 29. ​​Water supply pipe; 3. Heat exchange station; 4. Secondary network; 41. User heating end; 42. Secondary network heat exchange end; 43. Heat exchange bypass; 44. Heat exchange bypass valve; 45. Secondary network circulation pump; 46. Riser main valve; 5. Heat user end; 51. Household locking valve; 52. Radiator; 53. Indoor thermometer; 6. Control center. DETAILED DESCRIPTION

[0035] The present invention will be further described below in conjunction with the accompanying drawings.

[0036] like Figures 1 to 4 As shown, a heating pipe network system includes a heat source plant end 1, a primary network 2, a heat exchange station 3, a secondary network 4, a heat user end 5 and a centralized control center 6. The heat exchange station 3 is connected to the primary network 2 and the secondary network 3 respectively, the primary network 2 connects the heat source plant end 1 and the heat exchange station 3, and the secondary network 4 connects the heat exchange station 3 and the heat user end 5.

[0037] In a specific embodiment, the heat source plant end 1 includes a heat source water supply pipe 12, a boiler unit 13, a unit water pump unit 14 and a heat source return pipe 15 that are connected, and a water replenishment device 16 is connected in parallel to the heat source return pipe.

[0038] like Figure 2 and Figure 3As shown, the two ends of the primary network 2 are respectively a water mixing end 21 and a primary network heat exchange end 22. The water mixing end 21 is connected to the heat source plant end 1 through a two-way water mixer 11. Preferably, the internal structure of the two-way water mixer 11 is a full cavity or an adjustable orifice plate, which is respectively connected to the heat source water supply pipe 12, the heat source return pipe 15, the water supply pipe 29 of the water mixing end and the return pipe 23 of the water mixing end. During the operation of the system, the flow control required for the working state of the boiler unit 13 is quantitatively and distributedly regulated by the unit water pump group 14 and its supporting valves; the water circulation flow and pressure control of the primary network 2 are regulated by the primary network water pump group 24. Due to the cross-mixing effect of the two-way water mixer 11, the asynchronous control of the circulating water volume of the boiler unit 13 and the circulating water volume of the primary network 2 can be realized, thereby realizing the separate control capabilities of the heat source unit and the primary network with different flow rates. The constraints of the flow of the heating unit, that is, the flow of the primary network, caused by the absence of a water mixer in the existing system structure are further decoupled; at the same time, the unit can adjust the small cycle according to its own production situation without affecting the hydraulic balance state of the primary network. The hydraulic balance regulation of the primary network 2 is no longer affected by the regulation caused by the operating condition switching or power supply peak and valley at the heat source plant end 1, thus achieving decoupling.

[0039] A primary network water pump group 24 is installed on the return pipe 23 of the mixed water end; the primary network heat exchange end 22 is connected to the heat exchange station 3, which includes a heat exchange water supply pipe 221 and a heat exchange return pipe 222. A circulation bypass 25 is connected in parallel between the heat exchange water supply pipe 221 and the heat exchange return pipe 222. A first heat supply regulating valve 26 is installed on the circulation bypass 25, and a second heat supply regulating valve 27 is installed between the circulation bypass 25 and the heat exchange return pipe 222. The opening and closing states of the first heat supply regulating valve 26 and the second heat supply regulating valve 27 are negatively correlated. A hydraulic regulating pump 28 is installed downstream of the circulation bypass 25. Pressure gauges and temperature gauges are also installed on each section of the pipe, and the pressure gauges and temperature gauges are connected to the centralized control center 6.

[0040] The first heat delivery regulating valve 26 and the second heat delivery regulating valve 27 are combined into a primary network heat delivery regulating valve group, and the combination relationship is that the opening degree of the first heat delivery regulating valve 26 is the closing degree of the second heat delivery regulating valve 27, and vice versa, the closing degree of the first heat delivery regulating valve 26 is the opening degree of the second heat delivery regulating valve 27, such as: the opening degree of the first heat delivery regulating valve 26 is 30%, and the closing degree of the second heat delivery regulating valve 27 is 30% (the opening degree is 70%), and they are opened and closed synchronously. Its function is to control the flow of the primary side heat source water entering the heat exchange station 3 without affecting the flow of the primary side pipe network, thereby controlling the amount of heat delivered by the primary side pipe network to the secondary network 4. At the same time, a primary network hydraulic regulating pump 28 is set downstream of the primary network heat delivery regulating valve group, and its function is to set the total hydraulic power of the primary network side of the current heat exchange station 3, and then change the hydraulic balance form of the primary network 2 through the current heat exchange station 3 from adjustment to setting, thereby better ensuring the hydraulic balance state of the primary network 2. At the same time, by setting the water volume on the primary network side of the current heat exchange station 3 through the hydraulic regulating pump 28 of the primary network, the stable state of the hydraulic balance of the primary side heating network is maintained. At the same time, by utilizing the combined control of the primary network heat delivery regulating valve group, the heat delivery of the primary side network in the current heat exchange station can be dynamically adjusted, realizing highly intelligent decoupling control that adjusts the heat delivery without affecting the hydraulic balance.

[0041] The centralized control center 6 is respectively connected to the two-way water mixer 11 , the primary network water pump group 24 , the first heat supply regulating valve 26 , the second heat supply regulating valve 27 and the hydraulic regulating pump 28 .

[0042] like Figure 3 and Figure 4 As shown, preferably, the secondary network 4 includes a user heating end 41 and a secondary network heat exchange end 42 connected to the heat exchange station 3, a heat exchange bypass 43 is connected in parallel to the secondary network heat exchange end 42, a heat exchange bypass valve 44 is installed on the heat exchange bypass 43, a secondary network circulation pump 45 is installed on the pipeline of the secondary network heat exchange end 42, a riser main valve 46 is installed on the inlet pipeline between the secondary network 4 and the heat user end 5, and the heat exchange bypass valve 44, the secondary network circulation pump 45 and the riser main valve 46 are respectively connected to the centralized control center 6 for control. Further preferably, the heat user end 5 includes an inlet lock valve 51 and a radiator 52 connected in sequence to the user heating end 41 of the secondary network 4, an indoor temperature meter 53 is installed on the radiator 52, and the indoor temperature meter 53 is installed in the area covered by the radiator 52, and the inlet lock valve 51 is installed on the downstream branch of the riser main valve 46.

[0043] The main riser valve 46 is set on the main line of the secondary network 4, and branches out to supply the covered heat users, realizing the main regulating function of the hydraulic balance of the secondary network 4. The household lock valve 12 is on the downstream branch of the main riser valve 11, directly realizing the setting function of the hydraulic balance regulation of the branch line, and at the same time, indirectly realizing the terminal regulating function of the hydraulic balance of the secondary network 4. Figure 2 As shown, the overall flow of the secondary network 4 of the heat exchange station 3 is controlled by the working frequency regulation of the secondary network circulation pump 45. In summary, the hydraulic balance of the secondary network 4 is relatively stable when the heat users are stable, and its balance distribution regulation can be completed quickly in a small range at the beginning of each heating season. The subsequent heating operation can be achieved through the variable adjustment method of the heat delivery of the primary network 2, which is a method of delivering as much heat as it receives. Furthermore, driven by the purpose of energy saving, the working frequency of the secondary network circulation pump 45 can be set as low as possible while ensuring the heat delivery amount to reduce energy consumption, and at the same time, it will not affect the hydraulic balance state in the secondary network 4. In a complete secondary network system, it usually includes a heat exchange station 3 and a set of secondary side circulation pumps 45, as well as multiple distributed branch lines led out from the riser main valves 46. In this structure, the riser main valve 46 realizes the hydraulic distribution regulation of each branch line in the secondary side, and the secondary network circulation pump 45 realizes the overall water flow and pressure control in the secondary network 4. Its function can realize the overall heat supply regulation by adjusting the overall flow and pressure under the condition that the relative distribution relationship remains unchanged. Specifically, it realizes the lowest power consumption operation of the secondary network on the basis of ensuring the heating demand. Furthermore, it realizes the distributed self-balancing system operation of the secondary network.

[0044] In the heating pipe network system of the present invention, the centralized control center 25 is a comprehensive system operation and dispatching center established based on the network cloud, which uses the signal access of each system position sensor as vision and touch, human-computer interaction as the brain, AI intelligent operation logic as expert support, and a remotely drivable electrical control system as hands and feet to realize the operation and dispatching of the overall system.

[0045] The control logic is as follows: when each system is running, the indoor temperature meter 53 at the heat user end uploads the indoor temperature of the heat user to the centralized control center 25 located in the cloud; similarly, the front-end sensors at each system location also upload the data at each location to the big data cloud storage center of the centralized control center 25 located in the cloud. The uploaded real-time data include: room temperature, light, air volume, environment, posture, water temperature & pressure of each node, system equipment operation status, etc.

[0046] The support library of experts with AI intelligent operation logic will perform real-time analysis on the uploaded data according to the system operation logic and the mathematical model obtained after machine learning, and then send the system control suggestions and operation status adjustment indicators to the human-computer interaction system. The system will synchronize the relevant information to the front end of the centralized control center 6 according to the predetermined logic. Then, the system general adjustment personnel will adjust the system according to the operating procedures. The adjustment action can be manual, semi-manual, intelligent and other methods, and the response frequency can reach the minute level.

[0047] The control method of any heating pipe network system of the present invention comprises the following steps:

[0048] S1, the water mixing ratio control of the two-way water mixing end based on the heat exchange regulation between the primary network and the heat source plant, in the peak period of electricity consumption, more heat is produced, the primary network stores heat, and the water temperature is t1, in the off-peak period of electricity consumption, less heat is produced and more heat is used, the primary network releases heat, and the water temperature is t2, 80℃≤t2<t1≤130℃;

[0049] S2. Based on the primary network connecting the heat source plant and the heat exchange station, the main heat exchange pipeline and the circulation bypass ratio control are set in parallel at the heat exchange station. During the peak power consumption period, the circulation bypass with normal flow v% is opened and 1-v% of the main heat exchange pipeline is opened; during the low power consumption period, the circulation bypass with normal flow u% is opened and 1-u% of the main heat exchange pipeline is opened, 0≤u <v≤100。

[0050] S3. Based on the regulation of the circulation pump at the heat exchange station end of the secondary network connecting the heat exchange station end and the heat user end, the water temperature of the secondary network maintains a basically constant output during peak and low electricity consumption periods.

[0051] The hydraulic balance of the primary network 2 is regulated and controlled by its own section, and the hydraulic balance of the heat source plant end 1 is regulated and controlled by the heat source plant end 1 itself. Thus, the heat source plant end 1 solves the passive hydraulic regulation problem caused by the regulation of the primary network 2, and its regulation method can be fully adaptively adjusted according to its own system operation conditions. For example, the regulation of the thermal power plant can be completely adjusted in the way that it generates more electricity and heat during the day and generates less electricity and heat at night, so that the water circulation system can run smoothly. The gas boiler heat source can completely avoid the peak of gas consumption and use the night to produce more heat. However, the problem brought about by this is that the heat generation of the heat source may not match the heating demand, which is less during the day and more at night, especially when there are multiple heat source plants in a pipe network. For this problem, the solution of the present invention is: through the hydraulic and thermal decoupling control of the heat exchange station 3, the output heat of the secondary network 4 is adjustable, instead of sending as much as possible, the traditional unfavorable factor of thermal inertia is amplified and fully utilized, breaking the constant temperature operation state of the primary side pipe network, and using its huge water capacity to handle more heat. Specifically, when the traditional primary network 2 is in constant temperature operation state, excessive heat release will occur if the temperature is too high, which will cause waste. The method used in the present invention is to utilize the characteristics of thermal inertia to absorb more heat when the heat source is in high supply, and the water temperature on the primary side will increase. During the heat release period when the heat supply is low, more heat can be released at the secondary side heat exchange station to ensure the greater demand of the heat user end. What is achieved is that the primary side pipe network of the heating pipe network is regarded as a heat storage body in a way that can be input at any time and has controlled output, and then the elastic throughput capacity of the primary side pipe network is used to undertake the fluctuation of the heat source, and the smooth operation of the heat source plant is guaranteed without wasting heat energy.

[0052] The above-mentioned embodiments only express one or more embodiments of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A control method for a heating pipe network system, characterized in that: The heat supply pipe network system comprises a heat source plant (1), a primary network (2), a heat exchange station (3), a secondary network (4), a plurality of heat user terminals (5) and a centralized control center (6), wherein the heat exchange station is connected to the primary network and the secondary network respectively, the primary network connects the heat source plant and the heat exchange station, and the secondary network connects the heat exchange station and the heat user terminals; The two ends of the primary network are respectively a water mixing end (21) and a primary network heat exchange end (22); the water mixing end is connected to the heat source plant end through a two-way water mixer (11); a primary network water pump group (24) is installed on the return pipe (23) of the water mixing end; the primary network heat exchange end is connected to the heat exchange station, which includes a heat exchange water supply pipe (221) and a heat exchange return pipe (222); a circulation bypass (25) is connected in parallel between the heat exchange water supply pipe and the heat exchange return pipe; a first heat supply regulating valve (26) is installed on the circulation bypass; a second heat supply regulating valve (27) is installed between the circulation bypass and the heat exchange return pipe; the opening and closing states of the first heat supply regulating valve and the second heat supply regulating valve are negatively correlated; and a hydraulic regulating pump (28) is installed downstream of the circulation bypass; The centralized control center is respectively connected with the two-way water mixer, the primary network water pump group, the first heat supply regulating valve, the second heat supply regulating valve and the hydraulic regulating pump control; The control method of the heating pipe network system comprises the following steps: S1, the water mixing ratio control of the two-way water mixing end based on the heat exchange regulation between the primary network and the heat source plant. During the peak power consumption period, the water temperature of the primary network is t1, and during the low power consumption period, the water temperature of the primary network is t2, 80℃≤t2<t1≤130℃; S2, based on the primary network connecting the heat source plant and the heat exchange station, set up parallel main heat exchange pipelines and circulation bypass ratio control at the heat exchange station. During the peak power consumption period, open the circulation bypass of normal flow v% and open 1-v% of the main heat exchange pipeline; during the low power consumption period, open the circulation bypass of normal flow u% and open 1-u% of the main heat exchange pipeline, 0≤u <v≤100; S3. Based on the regulation of the circulation pump at the heat exchange station end of the secondary network connecting the heat exchange station end and the heat user end, the water temperature of the secondary network is kept constant during the peak and low power consumption periods.

2. The control method of the heating pipe network system according to claim 1, characterized in that: The heat source plant end comprises a heat source water supply pipe (12), a boiler unit (13), a unit water pump group (14) and a heat source return pipe (15) which are connected to each other, and a water replenishment device (16) is connected in parallel to the heat source return pipe.

3. The control method of the heating pipe network system according to claim 1, characterized in that: The internal structure of the two-way water mixer is a full cavity or an adjustable orifice plate, which is respectively connected to the heat source water supply pipe (12), the boiler unit return pipe (15), the water supply pipe (29) at the mixing end, and the return pipe (23) at the mixing end.

4. The control method of the heating pipe network system according to claim 1, characterized in that: The secondary network includes a user heating end (41) and a secondary network heat exchange end (42) connected to a heat exchange station, a heat exchange bypass (43) is connected in parallel to the secondary network heat exchange end, a heat exchange bypass valve (44) is installed on the heat exchange bypass, a secondary network circulation pump (45) is installed on the secondary network heat exchange end pipeline, a riser main valve (46) is installed on the secondary network and the heat user end inlet pipeline, and the heat exchange bypass valve, the secondary network circulation pump and the riser main valve are respectively connected to the centralized control center for control.

5. The control method of the heating pipe network system according to claim 1, characterized in that: The heat user end comprises an inlet lock valve (51) and a radiator (52) which are connected in sequence on a pipeline, an indoor temperature meter (53) is installed on the radiator, the inlet lock valve is installed on a downstream branch line of the riser main valve, and the indoor temperature meter is connected to the centralized control center for control.

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