An energy-saving, high-efficiency and environmentally friendly heat exchange system and energy-saving operation method thereof

Abstract

The present invention discloses an energy-saving, high-efficiency and environmentally friendly heat exchange system and its energy-saving operation method. It includes a heat exchange module formed by connecting multiple heat exchangers by a high-temperature side heat source water supply pipe, a high-temperature side heat source water return pipe, a low-temperature side heat source water return pipe, a low-temperature side heat source water supply pipe, a high-temperature side water inlet mother pipe, a high-temperature side water outlet mother pipe, a low-temperature side water return mother pipe, a low-temperature side water outlet mother pipe, a first bypass pipe, a second bypass pipe and a cut-off valve arranged on the corresponding pipeline, and a distribution module, a user module and a circulation module sequentially connected in series between the low-temperature side heat source water supply pipe and the low-temperature side heat source water return pipe. The present invention can combine the high and low temperature sides of the heat exchanger in a serial or parallel connection mode by adjusting the opening and closing of the relevant cut-off valves, and disperse the circulation power in combination with the performance of each functional module. Under the condition of meeting the system heating demand, it can effectively improve the equipment operation efficiency, reduce the system investment and operation cost, save space and reduce environmental pollution.

Description

Technical Field

[0001] The present invention relates to the technical field of heating and heat supply, and in particular to an energy-saving, high-efficiency and environment-friendly heat exchange system and an energy-saving operation method of the heat exchange system. Background Art

[0002] As we all know, centralized heating is one of the infrastructures of modern cities. With the continuous expansion of urban scale, centralized heating systems have achieved rapid development, and heat exchange systems, as an important part of centralized heating systems, have also been increasingly used. The low-temperature side (i.e., secondary side) circulation process of traditional heat exchange systems is mainly composed of heat exchangers (also known as heat exchange stations), connecting pipes and equipment (such as circulating water pumps, etc.), heat user systems and other main components in a series manner. However, traditional heat exchange systems generally have the following problems:

[0003] 1. Based on the system architecture of the traditional heat exchange system, the circulating pressure difference required by the secondary network heat user system is usually met by increasing the circulating water flow rate on the secondary side of the heat exchange system and ensuring that the flow rate of the circulating water on the secondary side is the same when flowing through each component. This often leads to excessively high circulating power consumption on the secondary side of the heat exchange system. The main reason is that according to the Urban Construction Industry Standard of the People's Republic of China "Plate Heat Exchanger Unit" (CJ / T191-2004): "The flow velocity in the pipeline of the medium on the secondary side of the heat exchange system should be less than 3m / s". Due to the high upper limit flow rate, the secondary side of the heat exchange system often has a large resistance during operation. Through the analysis of a large amount of actual operation data, it can be seen that in the resistance loss distribution on the secondary side of most heat exchange systems, the resistance loss of the heat exchanger accounts for about 30%, the resistance loss of the secondary side connecting pipelines and equipment accounts for about 40%, and the resistance loss of the secondary network heat user system accounts for about 30%. It can be seen that the main energy consumption of the heat exchange system in the process of heat transmission and distribution is consumed in the local resistance of the heat exchange equipment and the connecting pipes and equipment on the secondary side of the unit, which is the reason why the circulation power consumption on the secondary side of the heat exchange system is too high.

[0004] 2. In the centralized heating system, the design temperature difference of the high temperature side of the heat exchanger is generally 40-50℃, and the design temperature difference of the low temperature side is generally 10-20℃. In actual application, the fluid flow rate through the high temperature side of the heat exchanger is generally much smaller than the fluid flow rate through the low temperature side of the heat exchanger. In addition, actual research also shows that the heat transfer characteristics of the heat exchanger (such as heat transfer coefficient, etc.) are only related to the fluid flow rate on the high temperature side (i.e., primary side) and the low temperature side (secondary side) of the heat exchanger, and have little to do with the size of the specific flow rate through the low temperature side of the heat exchanger. Therefore, if the fluid flow rate on the high temperature side of the heat exchanger is not changed, but the fluid flow rate on the low temperature side of the heat exchanger is simply increased, the heat transfer coefficient of the heat exchanger is often low, and the actual heat transfer effect is not ideal. In view of this, the general method generally adopted in the industry is to compensate for the series of problems caused by the low heat transfer coefficient by greatly increasing the heat transfer area of ​​the heat exchanger. However, this method will not only greatly increase the cost of system manufacturing, equipment configuration and system use, but also because the flow rate on the high-temperature side of the heat exchanger is too low, it is easy for impurities to be deposited in the high-temperature side of the heat exchanger, which will cause blockage or scaling of the heat exchanger and reduce the reliability of the operation of related equipment.

[0005] In view of the above problems, the industry has proposed a variety of solutions to reduce the operating energy consumption of the heat exchange system by reducing the flow rate entering the low-temperature side of the heat exchanger while ensuring the heat exchange effect remains unchanged. Specifically:

[0006] 1. In existing documents such as the "Indirect Connection Heat Exchange Station System" disclosed in Patent Application No. 201020526142.9 and the "A High-efficiency Energy-saving Heat Exchange Unit" disclosed in Patent Application No. 201721110093.9, a solution similar to "a large temperature difference and small flow circulation method is adopted on the low-temperature side of the heat exchanger" is proposed. However, in actual applications, due to the mismatch between the flow rates on the high-temperature side and the low-temperature side of the heat exchanger, the efficiency of the heat exchanger is often reduced. At the same time, when the flow rate on the low-temperature side of the heat exchanger is reduced, the flow rate on the low-temperature side of the heat exchanger is also significantly reduced. However, due to the influence of the connection method of the existing heat exchanger, the actual heat exchange effect of the heat exchanger is not ideal, resulting in the flow rate on the low-temperature side of the heat exchanger can only be reduced by 10-15%, and the energy-saving potential in the heat exchange process on the low-temperature side cannot be fully utilized.

[0007] 2. In existing documents such as the "Energy-Saving Heat Exchange Station" disclosed in patent application No. 200420063890.2, two solutions are mentioned. One of them is: a bypass pipe and a regulating valve can be added to the secondary side of the heat exchanger to reduce the resistance loss of the heat exchanger by reducing the flow entering the heat exchanger. However, this solution still does not effectively reduce the resistance loss of the common part of the pipeline inside the heat exchanger, and there is a phenomenon of waste of electricity. Another solution is to install a water pump on the pipeline before the secondary network enters the heat exchanger, and at the same time set a bypass pipe between the supply and return pipes of the heat exchanger, and also install a water pump on the bypass pipe, so that the two sets of water pumps can be operated in parallel to provide flow for the secondary network. However, this solution requires that the head of the circulating pump must not only overcome the resistance of the heat exchanger and its internal pipes, but also overcome the resistance loss of the secondary network, so that the head of the circulating pump needs to be increased by 30%, resulting in the overall transmission power consumption is still high; at the same time, the service pressure difference of the secondary network heat users is greatly affected by the circulating pump. Sometimes, in order to meet the needs of individual heat user systems with a longer heating radius, it is necessary to further increase the head of the circulating pump. Summary of the invention

[0008] In view of the deficiencies in the above-mentioned prior art, one object of the present invention is to provide an energy-saving, high-efficiency and environmentally friendly heat exchange system; another object of the present invention is to provide an energy-saving operation method based on the above-mentioned heat exchange system.

[0009] In order to achieve the above object, the present invention adopts the following technical solution:

[0010] An energy-saving, high-efficiency and environmentally friendly heat exchange system, comprising a heat exchange module, a transmission and distribution module, a user module and a circulation module;

[0011] The heat exchange module includes at least two heat exchangers, and the high-temperature side water inlet pipes of all the heat exchangers are connected in series with the high-temperature heat source water supply pipe through a high-temperature side water inlet mother pipe, the high-temperature side water outlet pipe is connected in series with the high-temperature heat source return pipe through the high-temperature side water outlet mother pipe, the low-temperature side water outlet pipe is connected in series with the low-temperature side heat source water supply pipe through the low-temperature side water outlet mother pipe, and the low-temperature side water inlet pipe is connected in series with the low-temperature side heat source return pipe through the low-temperature side water inlet mother pipe. The high-temperature side water inlet pipes, high-temperature side water outlet pipes, low-temperature side water outlet pipes and low-temperature side water inlet pipes of all the heat exchangers are equipped with a first shut-off valve, a second shut-off valve is installed on the high-temperature side water inlet mother pipe and located between every two adjacent heat exchangers, a third shut-off valve is installed on the high-temperature side water outlet mother pipe and located between every two adjacent heat exchangers, and the low-temperature side water outlet mother pipe is connected in series with the low-temperature side water outlet pipe. A fourth shut-off valve is installed on and between every two adjacent heat exchangers, a fifth shut-off valve is installed on the low-temperature side water inlet main pipe and between every two adjacent heat exchangers, a first bypass pipe is also provided between the high-temperature sides of every two adjacent heat exchangers, and a second bypass pipe is provided between the low-temperature sides, one end of the first bypass pipe is connected to the high-temperature side water inlet main pipe and is located downstream of the corresponding second shut-off valve, and the other end is connected to the high-temperature side water outlet main pipe and is located upstream of the corresponding third shut-off valve, one end of the second bypass pipe is connected to the low-temperature side water outlet main pipe and is located upstream of the corresponding fourth shut-off valve, and the other end is connected to the low-temperature side water inlet main pipe and is located downstream of the corresponding fifth shut-off valve; and a sixth shut-off valve and a seventh shut-off valve are respectively installed on each of the first bypass pipe and the second bypass pipe;

[0012] The distribution module, user module and circulation module are sequentially connected in series between the low-temperature side heat source water supply pipe and the low-temperature side heat source water return pipe, and the user module includes a high-area heating user unit and a low-area heating user unit.

[0013] Preferably, the transmission and distribution module includes a hot and cold water mixing device, a primary and secondary network water supply main pipe, a primary and secondary network return water main pipe and a first secondary network return water branch pipe, the water inlet of the hot and cold water mixing device is connected to the water outlet of the low-temperature side heat source water supply pipe, the water outlet is connected to the water inlet of the secondary network water supply main pipe, and the return water outlet is connected to the water outlet of the first secondary network return water branch pipe;

[0014] The user module includes at least one low-area heating user unit, the water inlet end of each of the low-area heating user units is connected to the secondary network water supply main pipe through the primary and secondary network water inlet branch pipe, and the water outlet end is connected to the secondary network return water main pipe through a low-area distribution circulation pump and a primary and secondary network water outlet branch pipe that are sequentially connected;

[0015] The circulation module includes a heat exchange circulation pump and a second secondary network return water branch pipe, the water outlet of the heat exchange circulation pump is connected to the water inlet end of the low-temperature side heat source return water pipe through an eighth shut-off valve, and the water inlet is connected to the water outlet end of the secondary network return water main pipe through the second secondary network return water branch pipe, and the second secondary network return water branch pipe is equipped with a ninth shut-off valve;

[0016] The water inlet end of the first secondary network return water branch pipe is connected to the secondary network return water main pipe and is located upstream of the ninth shut-off valve.

[0017] Preferably, the user module also includes at least one high-area heating user unit, and the water inlet end of each of the high-area heating user units is connected to the secondary network water supply main pipe through a high-area distribution circulation pump and a secondary network water inlet branch pipe that are connected in sequence, and the water outlet end of each of the high-area heating user units is connected to the secondary network return water main pipe through a pressure reducing valve, a return water linkage opening and closing valve and a secondary network water outlet branch pipe that are connected in sequence, and the return water linkage opening and closing valve is connected to the high-area distribution circulation pump for linkage opening and closing control.

[0018] Preferably, a tenth cut-off valve and a first dirt removal filter are installed on the second secondary network return water branch pipe and upstream of the ninth cut-off valve in sequence along the water flow direction.

[0019] Preferably, the water inlet of the user module is connected to the water outlet of the low-temperature side heat source water supply pipe, the water outlet is connected to a secondary network water return main pipe, and an eleventh shut-off valve is installed on the low-temperature side heat source water supply pipe;

[0020] The delivery and distribution module includes a hot and cold water mixing device and a delivery and distribution circulation pump whose water inlet is connected to the water outlet of the hot and cold water mixing device. The water inlet of the hot and cold water mixing device is connected to the low-temperature side heat source water supply pipe through a primary and secondary network water inlet main pipe and is located upstream of an eleventh shutoff valve, and the return water port is connected to the secondary network return water main pipe through a third secondary network return water branch pipe. The water outlet of the delivery and distribution circulation pump is connected to the low-temperature side heat source water supply pipe through a primary and secondary network water supply branch pipe and is located downstream of the eleventh shutoff valve. The secondary network water inlet main pipe is equipped with a twelfth shutoff valve, and the secondary network water supply branch pipe is equipped with a thirteenth shutoff valve.

[0021] The circulation module includes a heat exchange circulation pump, a third bypass pipe and a fourth bypass pipe. The water outlet of the heat exchange circulation pump is connected to the water inlet end of the low-temperature side heat source return pipe through an eighth shut-off valve, and the water inlet is connected to the secondary network return main pipe through a fourth secondary network return branch pipe. The fourth secondary network return branch pipe is equipped with a ninth shut-off valve. One end of the third bypass pipe is connected to the low-temperature side heat source return pipe and is located downstream of the eighth shut-off valve, and the other end is connected to the secondary network water supply branch pipe and is located upstream of the thirteenth shut-off valve. One end of the fourth bypass pipe is connected to the fourth secondary network return branch pipe and is located upstream of the ninth shut-off valve, and the other end is connected to the third secondary network return branch pipe; the third bypass pipe and the fourth bypass pipe are respectively equipped with a fourteenth shut-off valve and a fifteenth shut-off valve.

[0022] Preferably, a sixteenth shut-off valve and a second dirt removal filter are installed on the third secondary network return water branch pipe and located upstream of the fourth bypass pipe, and the seventeenth shut-off valve and a third dirt removal filter are installed on the fourth secondary network return water branch pipe and located upstream of the fourth bypass pipe, and are distributed sequentially along the flow direction of the water flow.

[0023] Preferably, a magnetic anti-scaling and descaling device is also installed on the low-temperature side heat source return pipe and between the heat exchanger and the circulation module.

[0024] An energy-saving operation method of an energy-saving, high-efficiency and environmentally friendly heat exchange system,

[0025] S1, heating operation for users in low-lying buildings, first close the return water linkage on-off valve and all the sixth and seventh shut-off valves, and simultaneously open the eighth, ninth, tenth and first, second, third, fourth and fifth shut-off valves; then start the heat exchange circulation pump and the low-lying distribution circulation pump to carry out the circulation heating operation;

[0026] S2. For heating operations for users in high-rise buildings, first close all sixth and seventh shut-off valves, and simultaneously open the eighth, ninth, and tenth shut-off valves, the return water linkage opening and closing valves, and all first, second, third, fourth, and fifth shut-off valves; then start the heat exchange circulation pump and the high-rise distribution circulation pump to carry out circulating heating operations.

[0027] An energy-saving operation method of an energy-saving, high-efficiency and environmentally friendly heat exchange system,

[0028] S1, heating operation during low heat load period, first close the eleventh block valve, the fourteenth block valve, the fifteenth block valve and all the sixth block valves and the seventh block valve, and simultaneously open the eighth block valve, the ninth block valve, the twelfth block valve, the thirteenth block valve, the sixteenth block valve, the seventeenth block valve and all the first block valves, the second block valve, the third block valve, the fourth block valve and the fifth block valve; then start the heat exchange circulation pump and the distribution circulation pump to carry out the circulation heating operation;

[0029] S2, heating operation during high heat load period, first close the eleventh block valve, the fourteenth block valve, the fifteenth block valve and all the second block valves, the third block valve, the fourth block valve and the fifth block valve, and simultaneously open the eighth block valve, the ninth block valve, the twelfth block valve, the thirteenth block valve, the sixteenth block valve, the seventeenth block valve and all the first block valves, the sixth block valve and the seventh block valve; then start the heat exchange circulation pump and the distribution circulation pump to carry out the circulation heating operation;

[0030] S3, the pipe network circulation flushing operation, first close the ninth block valve, the eleventh block valve, the twelfth block valve and the fourteenth block valve, and open the thirteenth block valve, the fifteenth block valve, the sixteenth block valve and the seventeenth block valve at the same time; then start the distribution circulation pump to carry out the circulation flushing operation;

[0031] S4, heating operation during heat exchange circulation pump failure, during the heating operation during low heat load or high heat load, first open the eleventh block valve, the fourteenth block valve and the fifteenth block valve, and then close the eighth block valve, the ninth block valve, the twelfth block valve and the thirteenth block valve to carry out heating and faulty pump maintenance operations;

[0032] S5. During heating operations when the distribution circulation pump fails, during the heating operation phase with low heat load or high heat load, first open the eleventh stop valve, the eighth stop valve and the ninth stop valve, and then close the twelfth stop valve, the thirteenth stop valve, the fourteenth stop valve, the fifteenth stop valve and the sixteenth stop valve to carry out heating and faulty pump maintenance operations.

[0033] Due to the adoption of the above scheme, the present invention can combine the high and low temperature sides of the heat exchanger in series or parallel connection by adjusting the opening and closing of the relevant shut-off valves, and disperse the circulation power in combination with the performance of each functional module. While meeting the heating demand of the system, it can effectively improve the equipment operation efficiency, reduce the investment and operation cost of the system, save space, and reduce environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram of the system layout of an embodiment of the present invention when centralized heat transmission and distribution is adopted;

[0035] Figure 2 for Figure 1 Schematic diagram of the pipe network flow path when performing heating operations during periods of low heat load;

[0036] Figure 3 for Figure 1 Schematic diagram of the pipe network flow path when performing heating operations during periods of high heat load;

[0037] Figure 4 for Figure 1 Schematic diagram of the pipe network flow path when performing pipe network circulation flushing operations;

[0038] Figure 5 for Figure 1 Pipeline network flow path diagram when the heat exchange circulation pump fails and heating operation is performed;

[0039] Figure 6 for Figure 1 Pipeline network flow path diagram when the distribution circulation pump fails and heating operation is performed;

[0040] Figure 7 A schematic diagram of the system layout of an embodiment of the present invention when heat distributed transmission and distribution is adopted;

[0041] Figure 8 for Figure 2 Schematic diagram of the pipe network flow path when performing heating operations for low-lying building users;

[0042] Fig. 9 for Figure 2 Schematic diagram of the pipe network flow path when performing heating operations for users in high and low-rise buildings. DETAILED DESCRIPTION

[0043] The embodiments of the present invention are described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways as defined and covered by the claims.

[0044] like Figure 1 and Figure 2 As shown, the present embodiment provides an energy-saving, high-efficiency and environmentally friendly heat exchange system, which includes a heat exchange module a, a distribution module b, a user module c and a circulation module d; wherein the heat exchange module a includes at least two heat exchangers (in order to fully illustrate the number of heat exchangers and the relationship between them, Figure 1 and Figure 2The high-temperature side water inlet pipes of all heat exchangers are connected in series with the high-temperature heat source water supply pipe GJ through a high-temperature side water inlet mother pipe L1, the high-temperature side water outlet pipes are connected in series with the high-temperature heat source return water pipe GC through a high-temperature side water outlet mother pipe L2, the low-temperature side water outlet pipes are connected in series with the low-temperature side heat source water supply pipe DC through a low-temperature side water outlet mother pipe L3, and the low-temperature side water inlet pipes are connected in series with the low-temperature side heat source return water pipe DC through a low-temperature side water inlet mother pipe L4. The pipes DJ are connected in series, and the high-temperature side water inlet pipes, high-temperature side water outlet pipes, low-temperature side water outlet pipes and low-temperature side water inlet pipes of all heat exchangers are equipped with a first shut-off valve F1, and a second shut-off valve F2 is installed on the high-temperature side water inlet mother pipe L1 and between every two adjacent heat exchangers, a third shut-off valve F3 is installed on the high-temperature side water outlet mother pipe L2 and between every two adjacent heat exchangers, and a fourth shut-off valve F3 is installed on the low-temperature side water outlet mother pipe L3 and between every two adjacent heat exchangers. A fifth shut-off valve F4 is installed on the low-temperature side water inlet mother pipe L4 and between every two adjacent heat exchangers. A first bypass pipe L5 is also arranged between the high-temperature sides of every two adjacent heat exchangers, and a second bypass pipe L6 is arranged between the low-temperature sides. One end of the first bypass pipe L5 is connected to the high-temperature side water inlet mother pipe L1 and is located downstream of the corresponding second shut-off valve F2, and the other end is connected to the high-temperature side water outlet mother pipe L2 and is located upstream of the corresponding third shut-off valve F3. One end of the second bypass pipe L6 is connected to the low-temperature side water outlet main pipe L3 and is located upstream of the corresponding fourth shut-off valve F4, and the other end is connected to the low-temperature side water inlet main pipe L4 and is located downstream of the corresponding fifth shut-off valve F5; and each first bypass pipe L5 and second bypass pipe L6 is respectively equipped with a sixth shut-off valve F6 and a seventh shut-off valve F7; the distribution module b, the user module c and the circulation module d are sequentially connected in series between the low-temperature side heat source water supply pipe DC and the low-temperature side heat source return pipe DJ.

[0045] Thus, by using the high-temperature side water inlet pipe L1, the high-temperature side water outlet pipe L2, the first bypass pipe L5, the second shut-off valve F2, the third shut-off valve F3 and the sixth shut-off valve F6 on the high-temperature side of multiple heat exchangers (such as: R-1, R-2 and R-3) and the low-temperature side water outlet pipe L3, the low-temperature side water inlet pipe L4, the second bypass pipe L6, the fourth shut-off valve F4, the fifth shut-off valve F5 and the seventh shut-off valve F7 on the low-temperature side, through the opening and closing adjustment control of the relevant shut-off valves, it is possible to create system architecture conditions for different operation combinations between multiple heat exchangers and to achieve high-efficiency heat exchange of the heat exchangers under any temperature difference and flow conditions (for example, the high-temperature side pipeline and the low-temperature side pipeline of the heat exchanger can be adjusted to be connected in series or in parallel according to actual conditions); taking the high-temperature side and the low-temperature side of the heat exchanger as an example, the medium flow on the high-temperature side and the medium flow on the low-temperature side are connected in series. The medium flow rates of the heat exchangers are close or even the same, which greatly increases the flow velocity of the high-temperature fluid medium in the high-temperature side of the heat exchanger, so that the fluid medium on both the high and low temperature sides of the heat exchanger can be in a turbulent state, so that the turbulent state of the fluid medium can be used to violently flush the plates of the heat exchanger to enhance the heat exchange effect of the entire system, which is more conducive to the efficient and stable operation of the heat exchanger; at the same time, the high and low temperature sides of the heat exchanger are connected in series, which also makes the heat exchange area of ​​the heat exchanger more economical, which is conducive to reducing the investment and operation costs of the system; after actual operation test comparison: the high and low temperature sides of the heat exchangers of the traditional or existing centralized heating system are operated in parallel, and the flow velocity of the high-temperature side of most heat exchangers is usually only 0.1m / s (or even smaller), the flow velocity of the low-temperature side is usually 0.25-0.4m / s, and the heat transfer coefficient of the heat exchanger can only reach 2000-2500W / ㎡·K. When the high and low temperature sides of the heat exchanger of the embodiment are operated in series, the flow velocity on the high temperature side of the heat exchanger is close to the flow velocity on the low temperature side (both can reach about 0.2m / s), and the heat transfer coefficient of the heat exchanger can reach 2700-3000W / ㎡·K.

[0046] In order to prevent the fluid medium in the pipeline of the entire heat exchange system from forming hard scale during the heating process, thereby affecting the heat exchange effect due to the adsorption of scale on the plate surface of the heat exchanger, a magnetic anti-scaling and descaling device E is also installed on the low-temperature side heat source return pipe DJ and between the heat exchanger and the circulation module d. Therefore, through the magnetic anti-scaling and descaling device E (which can adopt a magnetic anti-scaling device of electromagnetic principle or a magnetic anti-scaling device of permanent magnet structure according to actual conditions) set at the water inlet end of the low-temperature side of the heat exchanger, the molecular cluster structure of the circulating fluid medium is cut and interrupted in the process of continuously passing through the magnetic field lines formed by the electromagnetic principle or the permanent magnet principle, thereby achieving the effect of preventing scaling; at the same time, due to the existence of the magnetic anti-scaling and descaling device E, there is no need to configure a water softening device for the system, and there is no need to manually manage the water quality, which can not only avoid the problem of groundwater pollution caused by the discharge of waste salt, but also create conditions for the heat exchange system to achieve full automation management and save a lot of labor.

[0047] On the basis of the above, the heat exchange system of this embodiment can form different heat exchange systems according to the differences in the system pipe network of the user module c by selecting and setting the specific structures of the circulation module d, the distribution module b and the user module c, specifically:

[0048] Embodiment 1

[0049] like Figure 7 As shown, the transmission and distribution module b includes a hot and cold water mixing device H, a primary and secondary network water supply main pipe L7, a primary and secondary network return water main pipe L8 and a first secondary network return water branch pipe L9, the water inlet of the hot and cold water mixing device H is connected to the water outlet end of the low-temperature side heat source water supply pipe DC, the water outlet is connected to the water inlet end of the secondary network water supply main pipe L7, and the return water outlet is connected to the water outlet end of the first secondary network return water branch pipe L9; the user module c includes at least one low-area heating user unit WD, the water inlet end of each low-area heating user unit WD is connected to the secondary network water supply main pipe L7 through the primary and secondary network water inlet branch pipe L10, and the water outlet end is connected in sequence to the secondary network water supply main pipe L7. A low-zone distribution circulation pump B21 and a primary and secondary network outlet branch pipe L11 are connected with the secondary network return water main pipe L8; the circulation module d includes a heat exchange circulation pump B1 and a second secondary network return water branch pipe L12, the outlet of the heat exchange circulation pump B1 is connected with the water inlet end of the low-temperature side heat source return water pipe DJ through the eighth shut-off valve F8, and the water inlet is connected with the water outlet end of the secondary network return water main pipe L8 through the second secondary network return water branch pipe L12, and the second secondary network return water branch pipe L12 is equipped with a ninth shut-off valve F9; the water inlet end of the first secondary network return water branch pipe L9 is connected with the secondary network return water main pipe L8 and is located upstream of the ninth shut-off valve F9.

[0050] Therefore, based on the distribution mode of the low-zone heating user units WD and the system configuration of the transmission and distribution module b, a heat distributed transmission and distribution system architecture can be formed to meet the heating needs of low-zone building users. When configuring the system equipment, the operating parameters of the corresponding low-zone transmission and distribution circulation pump B21 can be personalized according to the resistance loss of the pipeline system of different low-zone heating user units WD, which is conducive to further reducing the operating power consumption of the heat exchange system.

[0051] In order to enable the entire system to be applicable to the heating demand of high-rise buildings at the same time, the user module c in the first embodiment can also be at least one high-area heating user unit WG, and the water inlet end of each high-area heating user unit WG is connected to the secondary network water supply main pipe L7 through a high-area distribution circulation pump B22 and a secondary network water inlet branch pipe L10 that are sequentially connected, and the water outlet end of each high-area heating user unit WG is connected to the secondary network return water main pipe L8 through a pressure reducing valve F19, a return water linkage opening and closing valve F18 and a secondary network water outlet branch pipe L11 that are sequentially connected, and the return water linkage opening and closing valve F18 is connected to the high-area distribution circulation pump B22 for linkage opening and closing control. Therefore, in the actual design and application of the system, the head of the low-area distribution circulation pump B21 and the high-area distribution circulation pump B22 can be selected or designed respectively according to the operating pressure of the pipe network system of different heating users, so as to achieve the safe operation of the same heat exchange system under different pressure requirements. At the same time, for the high-area heating user unit WG, the pipeline pressure can be reduced to the operating pressure of the entire system through the pressure reducing valve F19, and the return water linkage opening and closing valve F18 is opened and closed simultaneously with the high-area distribution circulation pump B22. It can effectively prevent the high-area distribution circulation pump B22 from causing water hammer when it stops running and cause damage to the system pipeline, thereby achieving the effect of automatically eliminating water hammer by switching on and off.

[0052] On this basis, considering that the traditional heat exchange system generally installs the filter device on the total return water pipeline (i.e., the low-temperature side heat source return water pipe DJ of this embodiment), due to the large circulation flow of the fluid medium in the system, it is easy to cause the resistance loss of the filter device and the circulation pump to increase, thereby increasing the operating power consumption of the system; therefore, as a preferred solution, this embodiment is also equipped with a tenth cut-off valve F10 and a first decontamination filter G1 distributed in sequence along the flow direction of the water flow on the second secondary network return water branch L12 and upstream of the ninth cut-off valve F9. Therefore, by installing the first decontamination filter G1 on the water inlet side of the heat exchange circulation pump B1, the resistance loss of the circulation pump can be greatly reduced, creating conditions for reducing the operating power consumption of the system.

[0053] In order to operate the system according to different situations so that the entire system can achieve good energy-saving and environmental protection effects, the present invention provides an operation method for the system architecture of the first embodiment under different situations, specifically:

[0054] 1. The heat distribution system adopted in Example 1, when all user modules c are users of low-zone buildings (assuming that the high-temperature side supply / return water design temperature of the heat exchanger is 130 / 60°C, the temperature difference is 70°C, and the low-temperature side (secondary network users) requires a supply / return water temperature of 65 / 45°C, with a temperature difference of 25°C), the following operating mode can be preferably used.

[0055] like Figure 8 Combined with Figure 7As shown; close the return water linkage on-off valve F18 and all the second shut-off valves F2, the third shut-off valves F3, the fourth shut-off valves F4 and the fifth shut-off valves F5, and open all the sixth shut-off valves F6 and the seventh shut-off valves F7, thereby forming a series connection structure between all the heat exchangers (such as Figure 8 The fluid flow path shown in FIG. 1 is shown in FIG. 1 ). Part of the low-temperature fluid medium (at this time, the temperature is 45°C) returned by the secondary network return water main pipe L8 passes through the heat exchange circulation pump B1 and is pressurized at a circulation flow rate close to or the same as that of the high-temperature side of the heat exchanger. It then enters the heat exchanger in turn through the low-temperature side heat source return water pipe DJ to be heated. The water flow temperature output from the low-temperature side outlet pipe of the last heat exchanger can reach 115°C (in line with the secondary side supply / return water temperature difference of 70°C), thereby forming a high-temperature fluid medium, which is transported to the distribution module b through the low-temperature side heat source water supply pipe DC.

[0056] In the distribution module b, the high-temperature fluid medium enters the cold and hot water mixing device H and mixes with the water flow entering through the secondary network return water main pipe L8 to form a sub-high temperature fluid medium with a temperature of 65°C, and then is transported to the user module c along the secondary network supply water main pipe L7.

[0057] In user module c, the sub-high temperature fluid medium is dispersed to the corresponding low-zone heating user unit WD along each secondary network water inlet branch pipe L10 for heat dissipation, and a low-temperature fluid medium with a temperature of 45°C is formed after heat dissipation. The low-temperature fluid medium is pressurized by the corresponding low-zone distribution circulation pump B21, and then converges to the secondary network return water mother pipe L8 along the corresponding secondary network water outlet branch pipe L11. Then, a part of the low-temperature fluid medium returns to the cold and hot water mixing device H to form a sub-high temperature fluid medium again after mixing with the high-temperature fluid medium and is finally transported to the low-zone heating user unit WD again. Another part of the low-temperature fluid medium enters the first decontamination filter G1 for filtration and expansion, and then, through the pressurization action of the heat exchange circulation pump B1 and the magnetization treatment of the magnetic anti-scaling and descaling device E, it enters the heat exchanger one by one from the low-temperature side heat source return pipe DJ to be heated, thereby re-forming a high-temperature medium.

[0058] This method can achieve the effect of accurately providing corresponding heating operation parameters and more reasonable heating operation modes according to the heating needs of heating users. For example, residential users can adopt a continuous operation mode, and public building users can adopt a time-sharing intermittent heating mode according to working hours and rest time, making the energy consumption distribution of heating operation more accurate.

[0059] 2. The heat distribution system adopted in Example 1, when all user modules c are users of high-rise and low-rise buildings (assuming that the high-temperature side supply / return water design temperature of the heat exchanger is 130 / 60°C, the temperature difference is 70°C, and the low-temperature side (secondary network users) requires a supply / return water temperature of 65 / 45°C, with a temperature difference of 25°C), the following operating mode can be preferably used.

[0060] like Fig. 9 Combined with Figure 7 As shown; close all the second shut-off valves F2, the third shut-off valves F3, the fourth shut-off valves F4 and the fifth shut-off valves F5, and open the return water linkage on-off valve F18 and all the sixth shut-off valves F6 and the seventh shut-off valves F7, so as to form a series connection structure between all the heat exchangers (such as Fig. 9 The fluid flow path shown in FIG. 1 is shown in FIG. 1 ). Part of the low-temperature fluid medium (at this time, the temperature is 45°C) returned by the secondary network return water main pipe L8 passes through the heat exchange circulation pump B1 and is pressurized at a circulation flow rate close to or the same as that of the high-temperature side of the heat exchanger. It then enters the heat exchanger in turn through the low-temperature side heat source return water pipe DJ to be heated. The water flow temperature output from the low-temperature side outlet pipe of the last heat exchanger can reach 115°C (in line with the secondary side supply / return water temperature difference of 70°C), thereby forming a high-temperature fluid medium, which is transported to the distribution module b through the low-temperature side heat source water supply pipe DC.

[0061] In the distribution module b, the high-temperature fluid medium enters the cold and hot water mixing device H and mixes with the water flow entering through the secondary network return water main pipe L8 to form a sub-high temperature fluid medium with a temperature of 65°C, and then is transported to the user module c along the secondary network supply water main pipe L7.

[0062] In the user module c, the sub-high temperature fluid medium is dispersed along each secondary network water inlet branch pipe L10 to the corresponding low-area heating user unit WD and high-area heating user unit WG for heat dissipation; wherein:

[0063] For the low-area heating user unit WD, the sub-high temperature fluid medium forms a low temperature fluid medium with a temperature of 45°C after heat dissipation. The low temperature fluid medium is then pressurized by the corresponding low-area distribution circulation pump B21, and then flows along the corresponding secondary network outlet branch pipe L11 to converge into the secondary network return water mother pipe L8. Then, a part of the low temperature fluid medium flows back to the cold and hot water mixing device H to form a sub-high temperature fluid medium again after mixing with the high temperature fluid medium and finally be transported to the low-area heating user unit WD again. The other part of the low temperature fluid medium enters the first decontamination filter G1 to be filtered and expanded, and then, through the pressurization action of the heat exchange circulation pump B1 and the magnetization treatment of the magnetic anti-scaling and descaling device E, it enters the heat exchanger one by one from the low temperature side heat source return pipe DJ to be heated, thereby re-forming a high temperature medium.

[0064] For the high-area heating user unit WG, the sub-high-temperature fluid medium is pressurized by the high-area distribution circulation pump B22, and then enters the high-area heating user unit WG to dissipate heat and cool down to a low-temperature fluid medium of 45°C. Then, it is reduced to the operating pressure of the entire system through the pressure reducing valve F19, and then flows along the corresponding secondary network outlet branch pipe L11 to converge into the secondary network return water main pipe L8, and then executes the same process as the low-temperature fluid medium in the low-area heating user unit WD; in this process, the return water linkage opening and closing valve F18 is opened and closed simultaneously with the high-area distribution circulation pump B22, which can effectively prevent the high-area distribution circulation pump B22 from causing damage to the system pipeline due to water hammer when it stops running, thereby achieving the effect of automatic switching to eliminate water hammer.

[0065] Embodiment 2

[0066] like Figure 1As shown, the water inlet of the user module c is connected to the water outlet of the low-temperature side heat source water supply pipe DC, and the water outlet is connected to the primary and secondary network water return mother pipe L8, and an eleventh shut-off valve F11 is installed on the low-temperature side heat source water supply pipe DC; the distribution module b includes a cold and hot water mixing device H and a distribution circulation pump B3 whose water inlet is connected to the water outlet of the cold and hot water mixing device H, and the water inlet of the cold and hot water mixing device H is connected to the low-temperature side heat source water supply pipe DC through the primary and secondary network water inlet mother pipe L13. The return water outlet is connected to the secondary network return water main pipe L8 through a third secondary network return water branch pipe L14, and the outlet of the distribution circulation pump B3 is connected to the low-temperature side heat source water supply pipe DC through a secondary network water supply branch pipe L15 and is located downstream of the eleventh shut-off valve F11. The secondary network water inlet main pipe L13 is equipped with a twelfth shut-off valve F12, and the secondary network water supply branch pipe L15 is equipped with a thirteenth shut-off valve F13. ; The circulation module d includes a heat exchange circulation pump B1, a third bypass pipe L16 and a fourth bypass pipe L17. The outlet of the heat exchange circulation pump B1 is connected to the water inlet end of the low-temperature side heat source return pipe DJ through the eighth shutoff valve F8, and the water inlet is connected to the secondary network return pipe L8 through a fourth secondary network return branch pipe L18. The fourth secondary network return branch pipe L18 is equipped with a ninth shutoff valve F9. One end of the third bypass pipe L16 is connected to the low-temperature side heat source return pipe DJ. The fourth bypass pipe L17 is connected to and located downstream of the eighth shut-off valve F8, and the other end is connected to the secondary network water supply branch L15 and located upstream of the thirteenth shut-off valve F13; one end of the fourth bypass pipe L17 is connected to the fourth secondary network return branch L18 and located upstream of the ninth shut-off valve F9, and the other end is connected to the third secondary network return branch L14; the third bypass pipe L16 and the fourth bypass pipe L17 are respectively equipped with a fourteenth shut-off valve F14 and a fifteenth shut-off valve F15. Therefore, when the user module c is a centralized heating network system, a centralized heat distribution system architecture can be formed by configuring the distribution module b and the circulation module d. The safety and reliability of the entire heat exchange system can be effectively improved by using the parallel operation and backup relationship between the heat exchange circulation pump B1 and the distribution circulation pump B3. At the same time, through the opening and closing conversion control of the corresponding shut-off valve, the system can also realize such as geothermal load heating operation mode, high heat load heating operation mode, new network user heating and pipe network cleaning operation mode, continuous heating operation mode under circulation power failure, etc., which effectively expands the applicability of the system.

[0067] On the basis of the second embodiment, as a preferred solution, the sixteenth cut-off valve F16 and the second decontamination filter G2 are arranged in sequence along the flow direction of the water flow on the third secondary network return water branch L14 and located upstream of the fourth bypass pipe L17, and the seventeenth cut-off valve F17 and the third decontamination filter G3 are arranged in sequence along the flow direction of the water flow on the fourth secondary network return water branch L18 and located upstream of the fourth bypass pipe L17. By respectively arranging decontamination filters in the circulation module d and the transmission and distribution module b, each module can flow through the corresponding decontamination filter according to its own circulation water volume, which is conducive to greatly reducing the resistance loss of the decontamination filter and the circulation pump, and creating favorable conditions for reducing the operating power consumption of the system.

[0068] In order to operate the system according to different situations so that the entire system can achieve good energy-saving and environmental protection effects, the present invention provides an operation method for the system architecture of the second embodiment under different situations, specifically:

[0069] 1. The centralized heat transmission and distribution system used in Example 2 can preferably be operated in the following manner when the heat supply is in the initial stage of operation and the heat load is low (assuming that the high temperature side supply / return water design temperature of the heat exchanger is 80 / 50°C, the temperature difference is 30°C, and the low temperature side (secondary network user) requires a supply / return water design temperature of 45 / 35°C, the temperature difference is 10°C).

[0070] like Figure 2 Shown and combined Figure 1 ; Close all the sixth shut-off valve F6, the seventh shut-off valve F7, the eleventh shut-off valve F11, the fourteenth shut-off valve F14 and the fifteenth shut-off valve F15, and open the other shut-off valves; so as to form a parallel connection structure (such as) between all heat exchangers (i.e., R-1, R-2, R-3, etc.) Figure 2 The fluid flow path shown in FIG. 1 is shown in FIG. 1 ). Part of the low-temperature fluid medium (at this time, the temperature is generally 35°C) returned by the secondary network return water main pipe L8 passes through the heat exchange circulation pump B1 and is pressurized at a circulation flow rate close to or the same as that of the high-temperature side of the heat exchanger. It then enters all heat exchangers through the low-temperature side heat source return water pipe DJ and is heated. The water flow temperature output by the low-temperature measured outlet water pipe of the heat exchanger can reach 65°C (in line with the secondary side supply / return water temperature difference of 30°C), thereby forming a high-temperature fluid medium. The high-temperature fluid medium is transported to the distribution module b through the low-temperature side outlet water main pipe L3 and the low-temperature side heat source supply water pipe DC.

[0071] In the distribution module b, the high-temperature fluid medium enters the hot and cold water mixing device H along the secondary network water inlet main pipe L13 and mixes with the water flow entering through the secondary network return main pipe L8 to form a sub-high temperature fluid medium with a temperature of 45°C. After being pressurized by the distribution circulation pump B3, it flows back along the secondary network water supply branch pipe L15 through the downstream of the eleventh shut-off valve F11 to the low-temperature side heat source water supply pipe DC and is finally transported to the user module c.

[0072] After heat dissipation in the user module c, the sub-high temperature fluid medium is reduced to a low temperature fluid medium with a temperature of 35°C, and then is divided into two parts for transportation along the secondary network return water main pipe L8. One part of it is filtered and expanded by the second pollution removal filter G2 along the third secondary network return water branch pipe L14 and then returned to the hot and cold water mixing device H to be mixed with the high temperature fluid medium and then transported to the circulation pump B3 for pressurized circulation; the other part is filtered and expanded by the third pollution removal filter G3 along the fourth secondary network return water branch pipe L18 and then returned to the heat exchange circulation pump B1. After being pressurized by the heat exchange circulation pump B1 and magnetized by the magnetic anti-scaling and descaling device E, it enters the heat exchanger again through the low temperature side heat source return water pipe DJ and the low temperature side inlet water main pipe L4 to be heated, thereby re-forming the high temperature fluid medium.

[0073] 2. The centralized heat transmission and distribution system used in Example 2 can preferably be operated in the following manner when the heating is in a severe cold period and the heat load is high (assuming that the high temperature side supply / return water design temperature of the heat exchanger is 130 / 60°C, the temperature difference is 70°C, and the low temperature side (secondary network user) requires a supply / return water design temperature of 65 / 45°C, with a temperature difference of 20°C).

[0074] like Figure 3 Shown and combined Figure 1 ; Close all the second shut-off valves F2, the third shut-off valves F3, the fourth shut-off valves F4 and the fifth shut-off valves F5, as well as the eleventh shut-off valves F11, the fourteenth shut-off valves F14 and the fifteenth shut-off valves F15, and open all the sixth shut-off valves F6 and the seventh shut-off valves F7, thereby forming a series connection structure between all the heat exchangers (such as Figure 3 The fluid flow path shown).

[0075] Part of the low-temperature fluid medium (the temperature is 45°C at this time) returned by the secondary network return water main pipe L8 passes through the heat exchange circulation pump B1 and is pressurized at a circulation flow rate close to or the same as that on the high-temperature side of the heat exchanger. It then enters the heat exchanger in turn through the low-temperature side heat source return water pipe DJ to be heated. The water flow temperature output from the low-temperature side outlet pipe of the last heat exchanger can reach 115°C (in line with the secondary side supply / return water temperature difference of 70°C), thereby forming a high-temperature fluid medium, which is transported to the distribution module b through the low-temperature side heat source supply water pipe DC.

[0076] In the distribution module b, the high-temperature fluid medium enters the cold and hot water mixing device H along the secondary network water inlet main pipe L13 and mixes with the water flow entering through the secondary network water return main pipe L8 to form a sub-high temperature fluid medium with a temperature of 65°C. Then, after being pressurized by the distribution circulation pump B3, it flows back to the low-temperature side heat source water supply pipe DC along the secondary network water supply branch pipe L15 through the downstream of the eleventh shut-off valve F11 and is finally transported to the user module c.

[0077] After heat dissipation in the user module c, the sub-high temperature fluid medium is cooled to a low temperature fluid medium with a temperature of 45°C, and then transported along the secondary network return water main pipe L8 in two parts, one part of which is filtered and expanded by the second pollution removal filter G2 along the third secondary network return water branch pipe L14 and then returned to the cold and hot water mixing device H to be mixed with the high temperature fluid medium and then transported to the circulation pump B3 for pressurized circulation; the other part is filtered and expanded by the third pollution removal filter G3 along the fourth secondary network return water branch pipe L18 and then returned to the heat exchange circulation pump B1, and after being pressurized by the heat exchange circulation pump B1 and magnetized by the magnetic anti-scaling and descaling device E, it enters the heat exchanger one by one through the low temperature side heat source return water pipe DJ to be heated, thereby re-forming the high temperature fluid medium.

[0078] 3. The centralized heat transmission and distribution system used in the second embodiment may preferably be operated in the following manner when it is necessary to perform a circulating flushing operation on the pipe network of a new user.

[0079] like Figure 4 Shown and combined Figure 1 ; First, close the ninth shutoff valve F9, the eleventh shutoff valve F11, the twelfth shutoff valve F12 and the fourteenth shutoff valve F14, so that the distribution module b is isolated as an independently operated system; then start the distribution circulation pump B3 to generate a higher circulation flow rate in the fluid medium in the pipeline of the distribution module b and the user module c, so as to transport the silt and debris in the corresponding pipeline to the second decontamination filter G2 and the third decontamination filter G3 for filtration and collection, and finally, through the opening and closing control of the sixteenth shutoff valve F16, the fifteenth shutoff valve F15 and the seventeenth shutoff valve F17, the second decontamination filter G2 and the third decontamination filter G3 are alternately cleaned. Thus, the problem of water resource waste caused by large-scale sewage discharge in the existing open flushing method is effectively solved. At the same time, due to the high flow rate in the pipeline during the cyclic flushing, the filter can be cleaned alternately without stopping the distribution circulation pump B3, so that the pipeline cleaning time is shorter and the efficiency is higher.

[0080] 4. During the heating operation of the centralized heat transmission and distribution system used in the second embodiment, once the heat exchange circulation pump B1 or the transmission and distribution circulation pump B3 fails, the following method can be preferably used to continue heating.

[0081] 1) When the heat exchange circulation pump B1 fails, Figure 5 Shown and combined Figures 1 to 3 , the eighth shut-off valve F8, the ninth shut-off valve F9, the thirteenth shut-off valve F13 and the twelfth shut-off valve F12 can be closed, and the fourteenth shut-off valve F14, the fifteenth shut-off valve F15 and the eleventh shut-off valve F11 can be opened at the same time, so that the low-temperature fluid medium can directly pass through the cold and hot water mixing device H and be pressurized by the internal distribution circulation pump B3, and then enter the heat exchanger through the low-temperature side heat source return pipe DJ to be heated to form a high-temperature fluid medium, and the high-temperature fluid medium will directly enter the user module c through the low-temperature side heat source supply pipe DC for heat dissipation. The low-temperature fluid medium formed after heat dissipation will enter the second decontamination filter G2 and the third decontamination filter G3 through the secondary network return water mother pipe L8 for decontamination and expansion, and finally enter the cold and hot water mixing device H to complete the heating cycle.

[0082] 2) When the distribution circulation pump B3 fails, Figure 6 Shown and combined Figures 1 to 3 , you can choose to close the fourteenth shut-off valve F14, the fifteenth shut-off valve F15, the sixteenth shut-off valve F16, the thirteenth shut-off valve F13 and the twelfth shut-off valve F12, and open the eighth shut-off valve F8, the ninth shut-off valve F9 and the eleventh shut-off valve F11 at the same time, so that the low-temperature fluid medium can be pressurized by the heat exchange circulation pump B1 and enter the heat exchanger through the low-temperature side heat source return pipe DJ for heating. After forming a high-temperature fluid medium, it enters the user module c along the low-temperature side heat source supply pipe DC for heat dissipation, and the low-temperature fluid medium formed by heat dissipation will enter the third decontamination filter G3 through the secondary network return pipe L8 for decontamination and expansion, and finally be pressurized and transported by the heat exchange circulation pump B1 to complete the heating cycle.

[0083] In summary, the heat exchange system of the embodiment of the present invention has the following beneficial effects compared with the traditional heat exchange system:

[0084] 1. Distributed setting of circulating power makes the system power consumption distribution more accurate and reasonable, which can be applied to the transformation of old systems and the manufacture of new heat exchange units.

[0085] 2. Based on the heat transfer principle that the heat transfer coefficient of the heat exchanger is proportional to the flow velocity of the fluid on one side of the heat transfer surface, the high and low temperature sides of multiple heat exchangers can be combined in series to significantly increase the flow velocity on the high temperature side, while the flow on the low temperature side changes very little when the flow decreases, thereby keeping the heat transfer efficiency stable when the flow changes on the high and low temperature sides of the heat exchanger.

[0086] 3. When the high and low temperature sides of multiple heat exchangers are combined in series, the resistance loss on the high temperature side of the heat exchanger increases to a certain extent, which is beneficial to improve the sensitivity of the high temperature side pipeline regulation, especially for the high temperature side pipeline operation pressure difference is large, due to the increase in the resistance of the heat exchanger, resulting in a relatively reduced pressure difference at both ends of the electric control valve of the high temperature side pipeline of the heat exchanger. The valve opening can control the optimal adjustment range, which is beneficial to reduce the frequent vibration of the valve core of the electric control valve due to pipeline pressure fluctuations, thereby reducing the wear of the valve core of the electric control valve and effectively extending the service life of the valve.

[0087] 4. The entire heat exchange system adopts a modular combination form. The connection between each module can be welded or flanged according to the actual situation, which is conducive to enhancing the expandability of the module system. If the system needs to add a new heat load, it only needs to add a corresponding user module system, which does not involve the process modification of the previous heat exchange system, and effectively reduces the modification cost of the heating pipe network system. At the same time, for the newly connected user module pipe network, before the operation of the entire system, without passing through the heat exchanger, it only needs to maintain a high flow rate circulation inside the distribution module b, so that the impurities in the pipes newly connected to the pipe network can be carried to the corresponding decontamination filter through the high-speed fluid medium for cleaning, thereby greatly improving the flushing effect of the pipe and avoiding blockage of the heat exchanger and even the entire system pipe network. In addition, in the early stage of system operation, it can also create conditions for the centralized exhaust and cold cycle balance adjustment operations of the pipe network on the low temperature side.

[0088] 5. Compared with the existing indirect connection heat exchange system, whether in the heat exchange link or the circulation and distribution link, the circulation pump only needs to overcome the resistance loss in the pipe network system of the corresponding module; therefore, the head required by the circulation pump is very low. When selecting the circulation pump, it is more suitable to select a low-speed circulation equipment, which can effectively reduce the noise and wear of the circulation pump and extend the service life of the equipment. At the same time, when the circulation pump adopts a variable frequency pump, during the speed regulation of the circulation pump, since the spectrum range adjusted by the frequency converter is more concentrated, it is more conducive to the circulation pump to maintain a high efficiency, further reducing the transportation energy consumption. In addition, by switching the opening and closing state of the shut-off valve, the distribution module b can be isolated into an independent circulation system, so that a closed loop is formed between the distribution module b and the user module c, which is helpful for the cold regulation and circulation cleaning of the secondary network, and avoids the existing open flushing. The problem of low medium flow rate, poor flushing effect, and large-scale sewage discharge causes waste of water resources.

[0089] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An energy-saving, high-efficiency and environmentally friendly heat exchange system, characterized by: It includes a heat exchange module (a), a transmission and distribution module (b), a user module (c) and a circulation module (d); The heat exchange module (a) comprises at least two heat exchangers, wherein the high-temperature side water inlet pipes of all the heat exchangers are connected in series with the high-temperature heat source water supply pipe (GJ) through a high-temperature side water inlet mother pipe (L1), the high-temperature side water outlet pipes are connected in series with the high-temperature heat source return water pipe (GC) through a high-temperature side water outlet mother pipe (L2), the low-temperature side water outlet pipes are connected in series with the low-temperature side heat source water supply pipe (DC) through a low-temperature side water outlet mother pipe (L3), and the low-temperature side water inlet pipes are connected in series with the low-temperature side heat source return water pipe (DC) through a low-temperature side water inlet mother pipe (L4). The water pipes (DJ) are connected in series, the high-temperature side water inlet pipes, the high-temperature side water outlet pipes, the low-temperature side water outlet pipes and the low-temperature side water inlet pipes of all the heat exchangers are equipped with a first shut-off valve (F1), the high-temperature side water inlet mother pipe (L1) is equipped with a second shut-off valve (F2) between every two adjacent heat exchangers, the high-temperature side water outlet mother pipe (L2) is equipped with a third shut-off valve (F3) between every two adjacent heat exchangers, the low-temperature side water outlet mother pipe (L3) is equipped with a third shut-off valve (F4) between every two adjacent heat exchangers, and the high-temperature side water outlet mother pipe (L3) is equipped with a third shut-off valve (F5) between every two adjacent heat exchangers. A fourth shutoff valve (F4) is installed between each of the heat exchangers; a fifth shutoff valve (F5) is installed on the low-temperature side water inlet main pipe (L4) and between each two adjacent heat exchangers; a first bypass pipe (L5) is also provided between the high-temperature sides of each two adjacent heat exchangers, and a second bypass pipe (L6) is provided between the low-temperature sides; one end of the first bypass pipe (L5) is connected to the high-temperature side water inlet main pipe (L1) and is located downstream of the corresponding second shutoff valve (F2); and the other end is connected to the high-temperature side water inlet main pipe (L1). The warm-side water outlet main pipe (L2) is connected and located upstream of the corresponding third shut-off valve (F3); one end of the second bypass pipe (L6) is connected to the low-temperature side water outlet main pipe (L3) and located upstream of the corresponding fourth shut-off valve (F4); the other end is connected to the low-temperature side water inlet main pipe (L4) and located downstream of the corresponding fifth shut-off valve (F5); and each of the first bypass pipe (L5) and the second bypass pipe (L6) is respectively provided with a sixth shut-off valve (F6) and a seventh shut-off valve (F7); The distribution module (b), user module (c) and circulation module (d) are sequentially connected in series between the low-temperature side heat source water supply pipe (DC) and the low-temperature side heat source return pipe (DJ), and the user module (c) includes a high-area heating user unit (WG) and a low-area heating user unit (WD).

2. The energy-saving, high-efficiency and environmentally friendly heat exchange system according to claim 1, characterized in that: The distribution module (b) comprises a hot and cold water mixing device (H), a primary and secondary network water supply main pipe (L7), a primary and secondary network return water main pipe (L8) and a first secondary network return water branch pipe (L9); the water inlet of the hot and cold water mixing device (H) is connected to the water outlet of the low-temperature side heat source water supply pipe (DC), the water outlet is connected to the water inlet of the secondary network water supply main pipe (L7), and the return water outlet is connected to the water outlet of the first secondary network return water branch pipe (L9); The user module (c) comprises at least one low-area heating user unit (WD), the water inlet of each of the low-area heating user units (WD) being connected to the secondary network water supply main pipe (L7) through a primary and secondary network water inlet branch pipe (L10), and the water outlet being connected to the secondary network water return main pipe (L8) through a low-area distribution circulation pump (B21) and a primary and secondary network water outlet branch pipe (L11) which are connected in sequence; The circulation module (d) comprises a heat exchange circulation pump (B1) and a second secondary network return water branch pipe (L12); the water outlet of the heat exchange circulation pump (B1) is connected to the water inlet of the low-temperature side heat source return water pipe (DJ) through an eighth shutoff valve (F8); the water inlet is connected to the water outlet of the secondary network return water main pipe (L8) through the second secondary network return water branch pipe (L12); and the second secondary network return water branch pipe (L12) is provided with a ninth shutoff valve (F9); The water inlet end of the first secondary network return water branch pipe (L9) is connected to the secondary network return water main pipe (L8) and is located upstream of the ninth shut-off valve (F9).

3. The energy-saving, high-efficiency and environmentally friendly heat exchange system according to claim 1, characterized in that: The user module (c) also includes at least one high-area heating user unit (WG), and the water inlet end of each of the high-area heating user units (WG) is connected to the secondary network water supply main pipe (L7) through a high-area distribution circulation pump (B22) and a secondary network water inlet branch pipe (L10) that are connected in sequence, and the water outlet end of each of the high-area heating user units (WG) is connected to the secondary network return water main pipe (L8) through a pressure reducing valve (F19), a return water linkage opening and closing valve (F18) and a secondary network water outlet branch pipe (L11) that are connected in sequence, and the return water linkage opening and closing valve (F18) is connected to the high-area distribution circulation pump (B22) for linkage opening and closing control.

4. The energy-saving, high-efficiency and environmentally friendly heat exchange system according to claim 2, characterized in that: A tenth cut-off valve (F10) and a first dirt removal filter (G1) are also installed on the second secondary network return water branch pipe (L12) and upstream of the ninth cut-off valve (F9) and are sequentially distributed along the water flow direction.

5. The energy-saving, high-efficiency and environmentally friendly heat exchange system according to claim 1, characterized in that: The water inlet of the user module (c) is connected to the water outlet of the low-temperature side heat source water supply pipe (DC), the water outlet is connected to the primary and secondary network water return main pipe (L8), and an eleventh shut-off valve (F11) is installed on the low-temperature side heat source water supply pipe (DC); The delivery and distribution module (b) comprises a hot and cold water mixing device (H) and a delivery and distribution circulation pump (B3) whose water inlet is connected to the water outlet of the hot and cold water mixing device (H); the water inlet of the hot and cold water mixing device (H) is connected to the low-temperature side heat source water supply pipe (DC) through a primary and secondary network water inlet main pipe (L13) and is located upstream of an eleventh shut-off valve (F11); the water return port is connected to the secondary network return water main pipe (L8) through a third secondary network return water branch pipe (L14); the water outlet of the delivery and distribution circulation pump (B3) is connected to the low-temperature side heat source water supply pipe (DC) through a primary and secondary network water supply branch pipe (L15) and is located downstream of the eleventh shut-off valve (F11); the secondary network water inlet main pipe (L13) is provided with a twelfth shut-off valve (F12); and the secondary network water supply branch pipe (L15) is provided with a thirteenth shut-off valve (F13); The circulation module (d) comprises a heat exchange circulation pump (B1), a third bypass pipe (L16) and a fourth bypass pipe (L17); the water outlet of the heat exchange circulation pump (B1) is connected to the water inlet end of the low-temperature side heat source return pipe (DJ) through an eighth shutoff valve (F8); the water inlet is connected to the secondary network return pipe (L8) through a fourth secondary network return branch pipe (L18); a ninth shutoff valve (F9) is installed on the fourth secondary network return branch pipe (L18); one end of the third bypass pipe (L16) is connected to the low-temperature side heat source return pipe (DJ); J) and is located downstream of the eighth shutoff valve (F8), and the other end is connected to the secondary network water supply branch pipe (L15) and is located upstream of the thirteenth shutoff valve (F13); one end of the fourth bypass pipe (L17) is connected to the fourth secondary network return water branch pipe (L18) and is located upstream of the ninth shutoff valve (F9), and the other end is connected to the third secondary network return water branch pipe (L14); the third bypass pipe (L16) and the fourth bypass pipe (L17) are respectively provided with a fourteenth shutoff valve (F14) and a fifteenth shutoff valve (F15).

6. The energy-saving, high-efficiency and environmentally friendly heat exchange system according to claim 5, characterized in that: A sixteenth shutoff valve (F16) and a second dirt removal filter (G2) are also installed on the third secondary network return water branch pipe (L14) and located upstream of the fourth bypass pipe (L17) and are sequentially distributed along the flow direction of the water flow; a seventeenth shutoff valve (F17) and a third dirt removal filter (G3) are also installed on the fourth secondary network return water branch pipe (L18) and located upstream of the fourth bypass pipe (L17) and are sequentially distributed along the flow direction of the water flow.

7. The energy-saving, high-efficiency and environmentally friendly heat exchange system according to claim 1, characterized in that: A magnetic anti-scaling and descaling device (E) is also installed on the low-temperature side heat source return pipe (DJ) and between the heat exchanger and the circulation module (d).

8. The energy-saving operation method of an energy-saving, high-efficiency and environmentally friendly heat exchange system according to claim 4, characterized in that: S1, heating operation for users in low-lying area buildings, first close the return water linkage on-off valve (F18) and all the sixth shut-off valves (F6) and the seventh shut-off valve (F7), and simultaneously open the eighth shut-off valve (F8), the ninth shut-off valve (F9), the tenth shut-off valve (F10) and all the first shut-off valves (F1), the second shut-off valve (F2), the third shut-off valve (F3), the fourth shut-off valve (F4) and the fifth shut-off valve (F5); then start the heat exchange circulation pump (B1) and the low-lying area distribution circulation pump (B21) to carry out the circulation heating operation; S2. For heating operation of users in high-rise buildings, first close all sixth shut-off valves (F6) and seventh shut-off valves (F7), and simultaneously open the eighth shut-off valve (F8), ninth shut-off valve (F9), tenth shut-off valve (F10), return water linkage opening and closing valve (F18) and all first shut-off valves (F1), second shut-off valves (F2), third shut-off valves (F3), fourth shut-off valves (F4) and fifth shut-off valves (F5); then start the heat exchange circulation pump (B1) and the high-rise distribution circulation pump (B22) to carry out the circulation heating operation.

9. The energy-saving operation method of an energy-saving, high-efficiency and environmentally friendly heat exchange system according to claim 6, characterized in that: S1, heating operation during low heat load period, first close the eleventh shut-off valve (F11), the fourteenth shut-off valve (F14), the fifteenth shut-off valve (F15) and all the sixth shut-off valves (F6) and the seventh shut-off valve (F7), and simultaneously open the eighth shut-off valve (F8), the ninth shut-off valve (F9), the twelfth shut-off valve (F12), the thirteenth shut-off valve (F13), the sixteenth shut-off valve (F16), the seventeenth shut-off valve (F17) and all the first shut-off valves (F1), the second shut-off valve (F2), the third shut-off valve (F3), the fourth shut-off valve (F4) and the fifth shut-off valve (F5); then start the heat exchange circulation pump (B1) and the distribution circulation pump (B3) to carry out the circulation heating operation; S2, heating operation during high heat load period, first close the eleventh stop valve (F11), the fourteenth stop valve (F14), the fifteenth stop valve (F15) and all the second stop valves (F2), the third stop valve (F3), the fourth stop valve (F4) and the fifth stop valve (F5), and simultaneously open the eighth stop valve (F8), the ninth stop valve (F9), the twelfth stop valve (F12), the thirteenth stop valve (F13), the sixteenth stop valve (F16), the seventeenth stop valve (F17) and all the first stop valves (F1), the sixth stop valve (F6) and the seventh stop valve (F7); then start the heat exchange circulation pump (B1) and the distribution circulation pump (B3) to carry out the circulation heating operation; S3, the pipe network circulation flushing operation, first close the ninth block valve (F9), the eleventh block valve (F11), the twelfth block valve (F12) and the fourteenth block valve (F14), and simultaneously open the thirteenth block valve (F13), the fifteenth block valve (F15), the sixteenth block valve (F16) and the seventeenth block valve (F17); then start the distribution circulation pump (B3) to carry out the circulation flushing operation; S4, heating operation during failure of heat exchange circulation pump (B1), during heating operation during low heat load or heating operation during high heat load, first open the eleventh shut-off valve (F11), the fourteenth shut-off valve (F14) and the fifteenth shut-off valve (F15), then close the eighth shut-off valve (F8), the ninth shut-off valve (F9), the twelfth shut-off valve (F12) and the thirteenth shut-off valve (F13) to carry out heating and faulty pump maintenance operations; S5. Heating operation during failure of the distribution circulation pump (B3). During the heating operation with low heat load or the heating operation with high heat load, first open the eleventh shut-off valve (F11), the eighth shut-off valve (F8) and the ninth shut-off valve (F9), and then close the twelfth shut-off valve (F12), the thirteenth shut-off valve (F13), the fourteenth shut-off valve (F14), the fifteenth shut-off valve (F15) and the sixteenth shut-off valve (F16) to carry out heating and faulty pump maintenance operations.

Images