CN211925872U - Energy-saving reconstruction system of heat supply unit - Google Patents
Energy-saving reconstruction system of heat supply unit Download PDFInfo
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- CN211925872U CN211925872U CN202020583703.2U CN202020583703U CN211925872U CN 211925872 U CN211925872 U CN 211925872U CN 202020583703 U CN202020583703 U CN 202020583703U CN 211925872 U CN211925872 U CN 211925872U
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Abstract
The utility model discloses a heat supply unit energy-saving transformation system. The high-temperature side water inlet main pipe, the high-temperature side water outlet main pipe, the low-temperature side water inlet main pipe, a secondary net circulating pump, a heat exchange circulating pump, a secondary net water return main pipe, a secondary net water supply main pipe, a heat exchange module, a low-temperature side water outlet bypass pipe for communicating a low-temperature side water outlet of the heat exchange module with a water suction port of the secondary net circulating pump, a low-temperature side water inlet and outlet bypass pipe for communicating a water outlet of the secondary net circulating pump with the low-temperature side water outlet main pipe, and a shutoff valve arranged on a corresponding pipeline. The utility model discloses on the basis of traditional typical central heating unit, through keeping the secondary network circulating pump, increasing heat transfer circulating pump and associated pipeline and valve and demolish the check valve of non return bypass pipe and secondary network circulating pump water outlet side, formed brand-new heating system structure and operational mode, its operation is adjusted more in a flexible way, the operation energy consumption is showing and is reducing.
Description
Technical Field
The utility model belongs to the technical field of heating technology and specifically relates to a heat supply unit energy-saving transformation system.
Background
With the continuous expansion of the scale of urban central heating, heat exchange station systems and heat exchange units in the central heating system are increasingly popularized and applied. However, a heat exchange station system and a heat exchange unit (fig. 1 shows a structure of a traditional typical central heating system) used in the existing central heating system have certain defects in a system structure and an operation process flow, so that the problems of energy waste, poor economy and the like exist in the operation of the central heating system; the concrete expression is as follows:
1. when an existing heat exchange station or heat exchange unit is manufactured, the ratio of the temperature difference of the secondary side (namely, a low-temperature side) to the temperature difference of the primary side (namely, a high-temperature side) is generally more than 3: 1 or higher ratio, the length-width ratio of the heat exchanger plate type is less, thereby causing the phenomena that the heat exchanger generally has large heat exchange area allowance, insufficient heat exchange, low primary side flow velocity and the like, leading to easy deposition of impurities, scaling or blockage in the primary side flow channel of the heat exchanger, and seriously reducing the reliability of the operation of the equipment and the whole heat supply system.
2. The heat exchangers, circulating water pumps, pipeline connecting equipment, heat user systems and the like in a low-temperature side circulating system of an existing heat exchange station or a heat exchange unit all adopt a series connection mode, and the flow of circulating water on the secondary side flowing through each part is the same; when the circulating pressure difference of a secondary network heat user system needs to be met, the flow passing through the low-temperature side is inevitably large, so that the advantage that the heat exchange area allowance of the heat exchanger is large cannot be exerted, and the problem that the internal circulating power consumption of the low-temperature side heat exchange system is high is easily caused.
3. In order to reduce the manufacturing cost, in a low-temperature side circulation system of the existing heat exchange station or heat exchange unit, the pipe diameters of connecting pipelines of all components are generally small, so that the heat exchange station and the unit are easy to operate and have large invalid power consumption due to overlarge local resistance.
4. The existing heat exchange station or heat exchange unit usually adopts a parallel operation mode of a plurality of heat exchangers, so that the time of high-temperature medium staying in the heat exchangers is short, and sufficient heat exchange is difficult to realize, thereby causing the circulating temperature difference of the high-temperature side of a centralized heating system to be small and seriously restricting the heat conveying capacity of a high-temperature side pipe network.
5. The existing heat exchange station or heat exchange unit cannot realize refined adjustment of a centralized heating system due to single process structure design function, control of operation parameters of the low-temperature side of the heat exchange station or the heat exchange unit can only be controlled through an electric adjusting valve on the high-temperature side, when the high-temperature side has higher heating temperature, the control mode of reducing the opening degree of the electric adjusting valve on the high-temperature side of the heat exchange station or the heat exchange unit can only be adopted, once a certain number of heat exchange stations or heat exchange units adopt the same control mode, the instantaneous pressure of the centralized heating system is increased easily, and further the operation safety of the high-temperature side of the centralized heating system is influenced.
6. The check valve is all installed to current heat exchange station or heat exchanger unit's circulating pump export, and the "water hammer" phenomenon appears when the purpose prevents to stop the pump suddenly to cause the destruction to the circulating pump. However, the design of the check valve is necessary for an open system, because the liquid in the system is maintained at a certain pressure by the water pump, when the pump is stopped suddenly, the upper space in the pipeline is instantly vacuumized, and the liquid can impact the water pump or the pipeline under the action of gravity. And the heat exchange station or the heat exchange unit and the secondary network form a completely closed system, and the system is always in a full water state in operation, so that when the circulating pump is suddenly stopped, the flow speed of the liquid can be gradually reduced under the action of inertia until the circulating pump is stopped, and a water hammer can not be generated, which is proved by actual operation. Therefore, the check valve arranged at the outlet of the circulating pump of the heat exchange system not only causes investment waste, but also increases the ineffective power consumption of the circulating pump.
7. In the existing centralized heating system, the temperature fluctuation phenomenon of the high-temperature side often or possibly occurs, once the temperature of the high-temperature side heat supply network suddenly rises, the heat exchange amount of a heat exchange station or a heat exchange unit can be increased instantly, the instant pressure rise and even overpressure of the low-temperature side pipe network of the heating system are easily caused, and the safety of the low-temperature side system is threatened. For the situation, most of the existing heat exchange stations or heat exchange units only adopt a low-temperature side drainage and pressure relief mode for treatment, so that the serious waste of water resources and the pollution of underground water are brought.
SUMMERY OF THE UTILITY MODEL
To the not enough of above-mentioned prior art existence, the utility model aims to provide a heat supply unit energy-saving transformation system.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a heat supply unit energy-saving transformation system comprises a high-temperature side water inlet main pipe, a high-temperature side water outlet main pipe, a low-temperature side water inlet main pipe, a low-temperature side water outlet bypass pipe, a low-temperature side water inlet and outlet bypass pipe, a secondary net water return main pipe, a secondary net water supply main pipe, a heat exchange module, a secondary net circulating pump and a heat exchange circulating pump;
the high-temperature side water inlet of the heat exchange module is communicated with a high-temperature side water inlet main pipe, the high-temperature side water outlet is communicated with a high-temperature side water outlet main pipe, the low-temperature side water outlet is communicated with a secondary network water supply main pipe through a low-temperature side water outlet main pipe and is simultaneously communicated with a water suction port of a secondary network circulating pump through a low-temperature side water outlet bypass pipe, the low-temperature side water inlet is communicated with a water outlet of the secondary network circulating pump through a low-temperature side water inlet main pipe, and a pipe section on the high-temperature side water inlet main pipe and on the upstream side of the high-temperature side water inlet of the;
the low-temperature side water inlet main pipe is provided with a first shut-off valve, the low-temperature side water outlet bypass pipe is provided with a second shut-off valve, the low-temperature side water inlet bypass pipe is provided with a third shut-off valve, the low-temperature side water inlet main pipe is sequentially provided with a fourth shut-off valve and a fifth shut-off valve along the water flow direction, one end of the low-temperature side water inlet bypass pipe is communicated with the low-temperature side water inlet main pipe and is positioned on a pipe section between the fourth shut-off valve and the fifth shut-off valve, and the other end of the low-temperature side water inlet bypass pipe is communicated with the low-temperature side water outlet main pipe and is positioned on a pipe section at the downstream side of the first shut;
the water outlet of the heat exchange circulating pump is communicated with the low-temperature side water inlet main pipe through a first branch pipe, the water suction port of the heat exchange circulating pump is communicated with a secondary network water return pipe through a second branch pipe on a pipe section between a fifth shutoff valve and the low-temperature side water inlet of the heat exchange module, the sixth shutoff valve is arranged on the first branch pipe, a seventh shutoff valve is arranged on the second branch pipe, the water suction port of the secondary network circulating pump is also communicated with the secondary network water return pipe through a third branch pipe, and an eighth shutoff valve is arranged on the third branch pipe.
Preferably, the heat exchange module comprises at least two heat exchangers, high-temperature side water inlets of all the heat exchangers are sequentially communicated with a high-temperature side water inlet mother pipe through a high-temperature side water inlet branch pipe, high-temperature side water outlets are sequentially communicated with a high-temperature side water outlet mother pipe through a high-temperature side water outlet branch pipe, low-temperature side water outlets are sequentially communicated with a low-temperature side water outlet mother pipe through a low-temperature side water outlet branch pipe, low-temperature side water inlets are sequentially communicated with the low-temperature side water inlet mother pipe through a low-temperature side water inlet branch pipe, and all the high-temperature side water inlet branch pipe, the high-temperature side water outlet branch pipe, the low-temperature side water outlet branch pipe and the low-temperature side water inlet branch pipe are provided with a ninth;
a tenth shutoff valve is arranged on the high-temperature side water inlet main pipe and between every two adjacent high-temperature side water inlet branch pipes, an eleventh shutoff valve is arranged on the high-temperature side water outlet main pipe and between every two adjacent high-temperature side water outlet branch pipes, a twelfth shutoff valve is arranged on the low-temperature side water outlet main pipe and between every two adjacent low-temperature side water outlet branch pipes, and a thirteenth shutoff valve is arranged on the low-temperature side water inlet main pipe and between every two adjacent low-temperature side water inlet branch pipes;
a first bypass branch pipe is further arranged between the high-temperature sides of every two adjacent heat exchangers, a second bypass branch pipe is arranged between the low-temperature sides, one end of each first bypass branch pipe is communicated with the high-temperature side water inlet main pipe and is positioned on the downstream side of the corresponding tenth shut-off valve, the other end of each first bypass branch pipe is communicated with the high-temperature side water outlet main pipe and is positioned on the upstream side of the corresponding eleventh shut-off valve, one end of each second bypass branch pipe is communicated with the low-temperature side water outlet main pipe and is positioned on the upstream side of the corresponding twelfth shut-off valve, and the other end of each second bypass branch pipe is communicated with the low-temperature side water inlet main pipe and is positioned on the downstream side of the corresponding thirteenth shut-off; and each first bypass branch pipe is provided with a fourteenth shutoff valve, and each second bypass branch pipe is provided with a fifteenth shutoff valve.
Preferably, the secondary net return water main pipe is communicated with the tenth branch pipe and the eleventh branch pipe simultaneously through at least two filtering devices which are connected in parallel.
Since the technical scheme is used, the utility model discloses on the basis of traditional typical central heating unit, through keeping the secondary network circulating pump, increasing heat transfer circulating pump and associated pipeline and valve and demolish the check valve of non return bypass pipe and secondary network circulating pump outlet side, formed brand-new heating system structure and operational mode, its operation is adjusted more in a flexible way, the operation energy consumption is showing and is reducing.
Drawings
Fig. 1 is a schematic structural view of a conventional typical district heating system;
fig. 2 is a schematic structural diagram of a system according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a pipe network circulation path when the heat exchanger parallel connection mode is executed according to the embodiment of the present invention;
fig. 4 is a schematic diagram of a pipe network circulation path when the heat exchanger series connection mode is executed according to the embodiment of the present invention;
fig. 5 is a schematic diagram of a pipe network circulation path when the failure mode of the secondary network circulation pump is executed according to the embodiment of the present invention;
fig. 6 is a pipe network circulation path diagram when the heat exchange circulation pump failure mode is executed.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways as defined and covered by the claims.
As shown in fig. 2, the energy-saving modification system for a heat supply unit provided in this embodiment includes a high-temperature side water inlet main pipe L1, a high-temperature side water outlet main pipe L2, a low-temperature side water outlet main pipe L3, a low-temperature side water inlet main pipe L4, a low-temperature side water outlet by-pass pipe L5, a low-temperature side water inlet by-pass pipe L6, a secondary grid water return main pipe L7, a secondary grid water supply main pipe L8, a heat exchange module, a secondary grid circulation pump B1, and a heat exchange circulation pump B2; the high-temperature side water inlet of the heat exchange module is communicated with a high-temperature side water inlet main pipe L1, the high-temperature side water outlet is communicated with a high-temperature side water outlet main pipe L2, the low-temperature side water outlet is communicated with a secondary network water supply main pipe L8 through a low-temperature side water outlet main pipe L3 and is simultaneously communicated with a water suction port of a secondary network circulating pump B1 through a low-temperature side water outlet bypass pipe L5, the low-temperature side water inlet is communicated with a water outlet of the secondary network circulating pump B1 through a low-temperature side water inlet main pipe L4, and a pipe section on the high-temperature side water inlet main pipe L1 and on the upstream side of the high-temperature side water inlet of the heat exchange module is; a first shut-off valve F1 is arranged on the low-temperature side water outlet main pipe L3, a second shut-off valve F2 is arranged on the low-temperature side water outlet bypass pipe L5, a third shut-off valve F3 is arranged on the low-temperature side water inlet bypass pipe L6, a fourth shut-off valve F4 and a fifth shut-off valve F5 are sequentially arranged on the low-temperature side water inlet main pipe L4 along the water flow direction, one end of the low-temperature side water inlet bypass pipe L6 is communicated with the low-temperature side water inlet main pipe L4 and is positioned on the pipe section between the fourth shut-off valve F4 and the fifth shut-off valve F5, and the other end of the low-temperature side water inlet bypass pipe L6 is communicated with the low-temperature side water outlet main pipe L3 and is positioned on the pipe section; the water outlet of the heat exchange circulating pump B2 is communicated with a low-temperature side water inlet main pipe L4 through a first branch pipe L9 and is positioned on a pipe section between a fifth shutoff valve F5 and a low-temperature side water inlet of the heat exchange module, a water suction port is communicated with a secondary network water return pipe L7 through a second branch pipe L10, a sixth shutoff valve F6 is arranged on the first branch pipe L9, a seventh shutoff valve F7 is arranged on the second branch pipe L10, the water suction port of the secondary network circulating pump B1 is also communicated with the secondary network water return pipe L7 through a third branch pipe L11, and an eighth shutoff valve F8 is arranged on the third branch pipe L11. It should be noted that: the high-temperature-side water inlet header pipe L1 and the high-temperature-side water outlet header pipe L2 are used as water inlet and outlet pipes for connecting the high-temperature side of the entire system to a heat supply source (which can also be understood as a system heat source), and the secondary-network water return header pipe L7 and the secondary-network water supply header pipe L8 are used as water supply and return pipes for connecting the low-temperature side of the entire system to secondary-network users.
Therefore, compared with the traditional typical centralized heating unit (or system) shown in the figure 1, on the basis of keeping the secondary network circulating pump B1, by adding the heat exchange circulating pump B2 and the related pipelines and valves thereof (namely: the low-temperature side water outlet by-pass pipe L5, the low-temperature side water inlet by-pass pipe L6, the first shut-off valve F1, the second shut-off valve F2, the third shut-off valve F3, the fifth shut-off valve F5, the sixth shut-off valve F6 and the seventh shut-off valve F7) and removing the original check valve at the water outlet side of the secondary network circulating pump B1, the secondary network circulating pump B1 and the heat exchange circulating pump B2 can be standby mutually, so that when one of the two is in failure, the water circulation process flow at the low-temperature side of the system is changed by switching the on-off state of the related shut-off valves, the system can maintain the basic circulation of the secondary network of the heating users, and the safety of the system operation is improved; and the circulation flow entering the heat exchange module can be independently controlled according to the design parameters or actual operation parameters of the heat exchange module, so that the inside of the heat exchange module has the process conditions of a large temperature difference and small flow operation mode, and further, the power consumption (such as circulation power consumption and the like) of the system is reduced, and the energy-saving effect is achieved. Meanwhile, in view of the fact that the traditional centralized heating unit can only increase or reduce the flow of the primary network by adjusting the opening degree of the electric adjusting valve DTF, so as to realize the adjustment and control of the operation parameters of the secondary network, thereby easily causing the pressure fluctuation of the primary network system and even causing the problem of safety threat to the operation of the heating system, when the whole system of the embodiment operates, the adjustment and control of the operation parameters of the secondary network can be realized by adjusting the opening degree of the electric adjusting valve DTF and changing the matching mode of the rotating speed of the heating circulating pump B2, and the operation safety of the heating system can be effectively guaranteed.
In order to optimize the structure of the whole system to the maximum extent, the heat exchange module of this embodiment includes at least two heat exchangers R (in order to fully explain the number of heat exchangers and the relationship between them, R-1 and R-2 are used as reference numerals of the heat exchangers in fig. 2), the high temperature side water inlets of all the heat exchangers R are sequentially communicated with the high temperature side water inlet main pipe L1 through a high temperature side water inlet branch pipe L12, the high temperature side water outlets are sequentially communicated with the high temperature side water outlet main pipe L2 through a high temperature side water outlet branch pipe L13, the low temperature side water outlets are sequentially communicated with the low temperature side water outlet main pipe L3 through a low temperature side water outlet branch pipe L14, the low-temperature side water inlet ports are sequentially communicated with a low-temperature side water inlet main pipe L4 through a low-temperature side water inlet branch pipe L15, and all the high-temperature side water inlet branch pipe L12, the high-temperature side water outlet branch pipe L13, the low-temperature side water outlet branch pipe L14 and the low-temperature side water inlet branch pipe L15 are provided with a ninth shut-off valve F9; a tenth shut-off valve F10 is arranged on the high-temperature side water inlet main pipe L1 and between every two adjacent high-temperature side water inlet branch pipes L12, an eleventh shut-off valve F11 is arranged on the high-temperature side water outlet main pipe L2 and between every two adjacent high-temperature side water outlet branch pipes L13, a twelfth shut-off valve F12 is arranged on the low-temperature side water outlet main pipe L3 and between every two adjacent low-temperature side water outlet branch pipes L14, and a thirteenth shut-off valve F13 is arranged on the low-temperature side water inlet main pipe L4 and between every two adjacent low-temperature side water inlet branch pipes L15; a first bypass branch pipe L16 is further arranged between the high-temperature sides of every two adjacent heat exchangers R, a second bypass branch pipe L17 is arranged between the low-temperature sides, one end of the first bypass branch pipe L16 is communicated with the high-temperature side water inlet main pipe L1 and is positioned at the downstream side of a corresponding tenth shutoff valve F10, the other end of the first bypass branch pipe L16 is communicated with the high-temperature side water outlet main pipe L2 and is positioned at the upstream side of a corresponding eleventh shutoff valve F11, one end of the second bypass branch pipe L17 is communicated with the low-temperature side water outlet main pipe L3 and is positioned at the upstream side of a corresponding twelfth shutoff valve F12, and the other end of the second bypass branch pipe L8296 is communicated with the low-temperature side water inlet main pipe L4 and is positioned at the downstream side of a corresponding thirteenth shutoff valve F; and each first bypass branch pipe L16 is provided with a fourteenth shutoff valve F14, and each second bypass branch pipe L17 is provided with a fifteenth shutoff valve F15.
Therefore, when the heat exchange module is kept to be used by connecting a plurality of heat exchangers R in parallel, the heat exchange module can serially connect the heat exchangers R connected in parallel according to the actual situation by utilizing the bypass branch pipe and controlling the opening and closing of the corresponding valve, so that the resistance loss of a high-temperature side pipeline of the heat exchange module can be increased, the resistance loss of the two sides of the upper and lower streams of the DTF (electric control valve) can be effectively decomposed, the DTF can accurately adjust the flow in the optimal stroke range, the working state of the DTF is improved, the abrasion degree of the valve is reduced, and the service life of the valve is prolonged; meanwhile, the heat exchanger can be used in series, so that the flow path of the fluid on the high-temperature side and the low-temperature side in the heat exchange module can be prolonged, the heat transfer effect of the heat exchange module is enhanced, the heat supply temperature difference of a heat source can be increased, the circulation flow of the high-temperature side required by the unit heat supply area is reduced, and the heat energy conveying capacity of the high-temperature side of the system is effectively improved.
In order to avoid that the fluid medium in the pipeline of the whole low-temperature side system has more impurities and is not easy to clean, and the fluid medium is formed into hard scale in the heating process, so that the scale is adsorbed on the surface of a plate sheet of a heat exchanger to influence the heat exchange effect, the secondary network backwater main pipe L7 of the embodiment is simultaneously communicated with the tenth branch pipe L10 and the eleventh branch pipe L11 through at least two filter devices GF which are mutually connected in parallel, so that the filter parts can be mutually standby by increasing the number of the filter parts, not only can the impurities be effectively filtered, but also conditions are created for reducing the local resistance loss of the backwater at the low-temperature side of the system entering the heat exchange module and the circulating power consumption at the low-temperature side; meanwhile, the problem that the machine needs to be stopped when sundries are cleaned is avoided; in practical applications, the filtering device GF of the present embodiment may be a ball valve filter with a closing function, or a combination of a shut-off valve and a filter, or a magnetic scale-preventing and removing device.
In addition, based on the system structure of the embodiment, during actual operation, the specific operation mode can be controlled with reference to the following situations (note that the shut-off valve described in the embodiment is preferably a valve having an automatic opening and closing control function, such as an electric valve or an electromagnetic valve), specifically:
the heat exchanger parallel mode as shown in fig. 3 and executed (assuming that the supply/return water temperature at the high temperature side of the heat exchanger is 95/50 deg.c, the temperature difference is 45 deg.c, and the supply/return water temperature required by the secondary network user is 60/45 deg.c, the temperature difference is 15 deg.c):
firstly, opening a second shut-off valve F2, a third shut-off valve F3, a fourth shut-off valve F4, a sixth shut-off valve F6, a seventh shut-off valve F7, an eighth shut-off valve F8, a ninth shut-off valve F9, a tenth shut-off valve F10, an eleventh shut-off valve F11, a twelfth shut-off valve F12 and a thirteenth shut-off valve F13, and closing a first shut-off valve F1, a fifth shut-off valve F5, a fourteenth shut-off valve F14 and a fifteenth shut-off valve F15 at the same time; and then the circulating heat supply operation can be carried out by starting the secondary net circulating pump B1 and the heat exchange circulating pump B2.
When in operation, the low-temperature side inlet water (with the temperature of 45 ℃) of the heat exchanger R passes through the heat exchange circulating pump B2 and is pressurized according to a certain heat exchange circulating flow, then enters the heat exchanger R connected in parallel to be heated, so that the temperature of the low-temperature side outlet water of the heat exchanger R is raised to 75 ℃ (the heat exchange temperature difference is 30 ℃), then enters the water suction port of the secondary network circulating pump B1 through the low-temperature side outlet water bypass pipe L5, is mixed with the return water conveyed by the secondary network return water main pipe L7 and the third branch pipe L11 and is cooled to 60 ℃, so that the heat supply temperature required by the operation of a secondary network is reached, then enters the secondary network circulating pump B1 to be pressurized, and enters the secondary network water main pipe L8 along the low-temperature side inlet water bypass pipe L6 to supply heat (or complete heat dissipation) to secondary network users, the temperature of the fluid conveyed back by the secondary network return water main pipe L7, one part enters a heat exchange circulating pump B2 through a second branch pipe L10, and the other part enters a third branch pipe L11, so that the heat supply operation of the secondary grid heat transmission and distribution cycle is completed. In the parallel mode of the heat exchangers, because the circulating temperature difference of the heat exchange circulating system is 30 ℃, the circulating temperature difference of the secondary network transmission and distribution circulating system is 15 ℃, the circulating flow provided by the heat exchange circulating pump B2 is 50% of the circulating flow provided by the secondary network circulating pump B1 according to the law of energy conservation, and therefore the power consumption of the low-temperature side of the system can be greatly reduced.
The heat exchanger series mode as shown in fig. 4 and executed (assuming that the supply/return water temperature at the high temperature side of the heat exchanger is 105/48 deg.c, the temperature difference is 57 deg.c, and the supply/return water temperature required by the secondary network user is 60/45 deg.c, the temperature difference is 15 deg.c):
firstly, opening a second shut-off valve F2, a third shut-off valve F3, a fourth shut-off valve F4, a sixth shut-off valve F6, a seventh shut-off valve F7, an eighth shut-off valve F8, a ninth shut-off valve F9, a fourteenth shut-off valve F14 and a fifteenth shut-off valve F15, and simultaneously closing a first shut-off valve F1, a fifth shut-off valve F5, a tenth shut-off valve F10, an eleventh shut-off valve F11, a twelfth shut-off valve F12 and a thirteenth shut-off valve F13; and then the circulating heat supply operation can be carried out by starting the secondary net circulating pump B1 and the heat exchange circulating pump B2.
When in operation, the low-temperature side inlet water (the temperature is 45 ℃) of the heat exchanger R passes through the heat exchange circulating pump B2 and is pressurized according to a certain heat exchange circulating flow, and then sequentially enters the heat exchangers R-2 and R-1 to be heated in multiple stages, wherein the temperature of the high-temperature side outlet water of the heat exchanger R-1 can be reduced to 48 ℃ (which is very close to the temperature of the low-temperature side return water of the heat exchange module), the temperature of the low-temperature side outlet water of the heat exchanger R-1 can be increased to 90 ℃ (the temperature difference is 45 ℃), then enters the water suction port of the secondary network circulating pump B1 through the low-temperature side outlet bypass pipe L5, is mixed with the return water conveyed by the secondary network return water main pipe L7 and the third branch pipe L11 to be reduced to 60 ℃, thereby reaching the heat supply temperature required by the operation of the secondary network, then enters the secondary network circulating pump B2 to be pressurized, and enters the secondary network supply water main pipe L8 along the low-, the temperature of the fluid conveyed back by the secondary network return water main pipe L7 is reduced to 45 ℃, after the fluid is filtered by the filter GF, one part of the fluid enters the heat exchange circulating pump B2 through the second branch pipe L10, and the other part of the fluid enters the third branch pipe L11, so that the heat transmission and distribution circulating heat supply operation of the secondary network is completed. In the heat exchanger series mode, because the circulating temperature difference of the heat exchange circulating system is 45 ℃ and the circulating temperature difference of the secondary network transmission and distribution circulating system is 15 ℃, according to the law of energy conservation, the circulating flow provided by the heat exchange circulating pump B2 is 33% of the circulating flow provided by the secondary network circulating pump B1, and the power consumption of the low-temperature side of the system is lower compared with the heat exchanger parallel mode.
Secondary network circulation pump failure mode as shown and implemented in fig. 5: firstly, opening a first shut-off valve F1, a sixth shut-off valve F6, a seventh shut-off valve F7, a ninth shut-off valve F9, a tenth shut-off valve F10, an eleventh shut-off valve F11, a twelfth shut-off valve F12 and a thirteenth shut-off valve F13, and simultaneously closing a second shut-off valve F2, a third shut-off valve F3, a fourth shut-off valve F4, a fifth shut-off valve F5, an eighth shut-off valve F8, a fourteenth shut-off valve F14 and a fifteenth shut-off valve F15; then starting a heat exchange circulating pump B2 to perform circulating heat supply operation; during operation, after heat dissipation and cooling of the secondary network users, fluid enters the heat exchanger R through the secondary network water return header pipe L7, the filtering device GF, the second branch pipe L10, the heat exchange circulating pump B2 and the first branch pipe L9 to be heated, and then is conveyed to the secondary network users through the low-temperature side water outlet main pipe L3 and the secondary network water supply header pipe L8 to complete secondary network heat transmission and distribution circulation.
Heat exchange circulation pump failure mode as shown and implemented in fig. 6: firstly, opening a first shut-off valve F1, a fourth shut-off valve F4, a fifth shut-off valve F5, an eighth shut-off valve F8, a ninth shut-off valve F9, a tenth shut-off valve F10, an eleventh shut-off valve F11, a twelfth shut-off valve F12 and a thirteenth shut-off valve F13, and simultaneously closing a second shut-off valve F2, a third shut-off valve F3, a sixth shut-off valve F6, a seventh shut-off valve F7, a fourteenth shut-off valve F14 and a fifteenth shut-off valve F15; then, the secondary net circulating pump B1 is started to perform circulating heat supply operation; the fluid delivery and distribution path is pressurized via secondary network circulation pump B1.
In view of the fact that the opening control of the DTF of the electric regulating valve at the high-temperature side of the system is realized by issuing a dispatching instruction according to the central dispatching system, the regulation and control strategy of the central dispatching system must consider to keep the pressure of the system at the high-temperature side of the central heating stable; because the traditional typical heating system can only adjust the DTF of the high-temperature side electric regulating valve in a certain opening range mostly, the heat exchange quantity cannot be controlled in time, the phenomenon that the temperature of the circulating medium of the low-temperature side system of the heat exchange module is obviously increased easily occurs, and then the pressure of the low-temperature side system is rapidly increased due to the expansion of the volume of fluid, for solving the problem, when the system executes a heat exchanger parallel mode or a heat exchanger series mode, if the temperature of a system heat source is suddenly increased, the rotating speed of the secondary network circulating pump B1 can be firstly maintained, and meanwhile, the rotating speed of the heat exchange circulating pump B2 is gradually reduced until the heat exchange circulating pump B2 stops running. From this, the heat transfer volume of reducible heat exchanger, secondary network circulating pump B1 still operates according to normal operating speed simultaneously, makes the heat dissipation capacity of low temperature side circulation medium be greater than heat exchanger heat transfer volume far away, and low temperature side circulation medium temperature constantly reduces, and the continuous shrink of volume then makes low temperature side system pressure reduce, guarantees low temperature side system operation safety.
To sum up, the utility model discloses reform transform system compares in the typical heat transfer system of tradition and has following beneficial effect:
1. the characteristic that a large margin (usually 15-20%) is reserved in the heat exchange area of the conventional heat exchange station or heat exchange unit during design and selection is fully utilized, and the operation mode of properly reducing the heat exchange circulation flow of the low-temperature side of the heat exchanger can be selected on the premise of keeping the heat exchange capacity of the conventional heat exchanger unaffected.
2. Through the additionally arranged heat exchange circulating pump B2, the low-temperature side circulating flow required by heat exchange of the heat exchanger can be independently provided according to the parameter requirement of the heat exchanger, so that the operation mode of large temperature difference and small flow is adopted in the heat exchanger, and the low-temperature side heat exchange circulating flow is reduced to 50-70% of the original secondary network circulating total flow. The circulating power consumption of the heat exchange station or the heat exchange unit in the heat exchange station or the heat exchange unit can be reduced to 15-35% of the original circulating power consumption, and the remarkable energy-saving effect is achieved.
3. According to the prior heat supply technology, because the line fine adjustment work of a heat supply secondary network is generally not completed, the heat at the low temperature side is distributed uniformly among heat supply users, and the problem is mainly solved by adopting a large-flow operation mode through the secondary network, the secondary network circulation flow of most centralized heat supply heat exchange stations or heat exchange units is very large, and the power consumption of a circulating pump is very high; the whole system of the embodiment can decompose the secondary network circulation process of the heat exchange module into a heat exchange circulation process and a secondary network transmission and distribution circulation process during operation, the heat exchange and the secondary network heat transmission and distribution are completed through different circulation systems, the power distribution of the low-temperature side heat supply circulation is more reasonable, the process operation mode can ensure that the secondary network heat is uniformly distributed, and the power consumption of the secondary network circulation pump can be effectively reduced.
4. The operation mode of the system can be adjusted abundantly and flexibly, and conditions are created for further fine adjustment of the heat supply amount of the central heating system and safe and stable operation of the system. Meanwhile, once the temperature of the heat source fluctuates, the opening of the primary grid electric regulating valve can be preliminarily regulated according to a central dispatching instruction as long as the rotating speed of the heat exchange circulating pump B2 is changed, so that the circulating flow entering the low-temperature side of the heat exchanger is changed, the heat transfer coefficient of the heat exchanger is increased and reduced, and the effective control of the secondary grid operation parameters of the low-temperature side heat supply users can be realized.
5. A circulating pump outlet check valve and a check bypass pipe in a transmission typical system are eliminated, the process flow is simplified, and meanwhile, the waste power consumption of the water pump when the local resistance of the check valve is overcome is further reduced.
6. A plurality of heat exchangers connected in parallel are used in series according to a multi-stage heat exchange mode, so that the fluid flow speed of the high-temperature side of each heat exchanger is greatly improved under the condition that the circulating flow is not increased, and the fluid flow speed of the low-temperature side is kept unchanged under the condition that the circulating flow is greatly reduced. Therefore, the heat transfer coefficient of the heat exchanger can be greatly improved, the heat supply capacity of the heat exchanger is improved, and the circulating flow participating in heat exchange at the low-temperature side of the heat exchanger can be reduced, so that the circulating power consumption of a heat exchange station or a heat exchange unit secondary network is obviously reduced.
7. The heat exchanger is used in series according to the multi-stage heat exchange mode, resistance loss of a heat exchange station or a high-temperature side pipeline of a heat exchanger unit can be increased, resistance loss around the high-temperature side electric regulating valve is effectively decomposed, accurate regulation of flow in the optimal stroke range of the high-temperature side electric regulating valve is facilitated, the working state of the high-temperature side electric regulating valve is improved, abrasion of a valve is reduced, and the service life of the valve is prolonged.
8. The multiple parallel heat exchangers are used in series according to the multi-stage heat exchange mode, the flow of high-temperature side and low-temperature side fluid in the heat exchangers is prolonged, the heat transfer effect of the heat exchangers is further enhanced, the heat supply temperature difference operation of a heat source on the high-temperature side is increased, the high-temperature side circulation flow required by unit heat supply area is reduced, the heat energy conveying capacity of the high-temperature side of a centralized heat supply system is effectively improved, and the heat supply scale is continuously enlarged under the condition that the existing high-temperature side circulation flow is not increased.
9. When any one of the water pumps of the heat exchange circulating pump B2 and the secondary network circulating pump B1 breaks down, the on-off state of the switch-off valve is switched to change the circulating process of the low-temperature side of the heat exchange station or the heat exchange unit, so that the system on the low-temperature side can still maintain the basic circulation of the secondary network of the heat supply users, and mutual standby is realized, and the safety of the system is further improved.
10. The number of the filtering devices between the low-temperature side backwater main pipe and the low-temperature side circulating pump suction inlet is increased, the local resistance loss of the low-temperature side backwater entering the heat exchange station or the heat exchange unit is reduced, the circulating power consumption of the low-temperature side is reduced, and the problem that the heat supply operation is stopped due to the fact that sundries are cleaned is solved.
11. The whole system and the operation mode can be suitable for the transformation of the old system and the manufacture of a newly built heat exchanger unit.
12. In the reconstruction of the old system, if the design type of the old heat exchanger or the updated heat exchanger meets the requirements of large temperature difference and small flow on the high and low temperature sides at the same time, the heat exchanger can be used singly.
The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings, or directly or indirectly applied to other related technical fields, are included in the same way in the protection scope of the present invention.
Claims (3)
1. The utility model provides a heat supply unit energy-saving transformation system which characterized in that: the system comprises a high-temperature side water inlet main pipe (L1), a high-temperature side water outlet main pipe (L2), a low-temperature side water outlet main pipe (L3), a low-temperature side water inlet main pipe (L4), a low-temperature side water outlet by-pass pipe (L5), a low-temperature side water inlet and outlet by-pass pipe (L6), a secondary network water return main pipe (L7), a secondary network water supply main pipe (L8), a heat exchange module, a secondary network circulating pump (B1) and a heat exchange circulating pump (B2);
a high-temperature side water inlet of the heat exchange module is communicated with a high-temperature side water inlet main pipe (L1), a high-temperature side water outlet is communicated with a high-temperature side water outlet main pipe (L2), a low-temperature side water outlet is communicated with a secondary net water supply main pipe (L8) through a low-temperature side water outlet main pipe (L3) and is simultaneously communicated with a water suction port of a secondary net circulating pump (B1) through a low-temperature side water outlet bypass pipe (L5), a low-temperature side water inlet is communicated with a water outlet of the secondary net circulating pump (B1) through a low-temperature side water inlet main pipe (L4), and a pipe section on the high-temperature side water inlet main pipe (L1) and on the upstream side of the high-temperature side water inlet of the heat exchange module is provided with an electric;
a first shut-off valve (F1) is arranged on the low-temperature side water outlet main pipe (L3), a second shut-off valve (F2) is arranged on the low-temperature side water outlet bypass pipe (L5), a third shut-off valve (F3) is arranged on the low-temperature side water outlet bypass pipe (L6), a fourth shut-off valve (F4) and a fifth shut-off valve (F5) are sequentially arranged on the low-temperature side water inlet main pipe (L4) along the water flow direction, one end of the low-temperature side water inlet bypass pipe (L6) is communicated with the low-temperature side water inlet main pipe (L4) and is positioned on the pipe section between the fourth shut-off valve (F4) and the fifth shut-off valve (F5), and the other end of the low-temperature side water outlet main pipe (L3) is communicated with the pipe section on the downstream side of the first shut-off valve (F1);
the delivery port of heat transfer circulating pump (B2) is linked together and is located on the pipeline section between the low temperature side inlet port of fifth shutoff valve (F5) and heat transfer module through first branch pipe (L9) and low temperature side inlet water mother pipe (L4), the water absorption mouth is linked together through second branch pipe (L10) and secondary network wet return (L7), be provided with sixth shutoff valve (F6) on first branch pipe (L9), be provided with seventh shutoff valve (F7) on second branch pipe (L10), the water absorption mouth of secondary network circulating pump (B1) still is linked together through third branch pipe (L11) and secondary network wet return (L7), just be provided with eighth shutoff valve (F8) on third branch pipe (L11).
2. The heating unit energy-saving reconstruction system of claim 1, characterized in that: the heat exchange module comprises at least two heat exchangers (R), high-temperature side water inlets of all the heat exchangers (R) are sequentially communicated with a high-temperature side water inlet main pipe (L1) through a high-temperature side water inlet branch pipe (L12), high-temperature side water outlets are sequentially communicated with a high-temperature side water outlet main pipe (L2) through a high-temperature side water outlet branch pipe (L13), low-temperature side water outlets are sequentially communicated with a low-temperature side water outlet main pipe (L3) through a low-temperature side water outlet branch pipe (L14), low-temperature side water inlets are sequentially communicated with a low-temperature side water inlet main pipe (L4) through a low-temperature side water inlet branch pipe (L15), and all the high-temperature side water inlet branch pipes (L12), the high-temperature side water outlet branch pipes (L13), the low-temperature side water outlet branch pipes (L14) and the low-temperature side water inlet branch pipes (L15) are provided with a ninth shut-off valve (F9;
a tenth shut-off valve (F10) is arranged on the high-temperature side water inlet main pipe (L1) and between every two adjacent high-temperature side water inlet branch pipes (L12), an eleventh shut-off valve (F11) is arranged on the high-temperature side water outlet main pipe (L2) and between every two adjacent high-temperature side water outlet branch pipes (L13), a twelfth shut-off valve (F12) is arranged on the low-temperature side water outlet main pipe (L3) and between every two adjacent low-temperature side water outlet branch pipes (L14), and a thirteenth shut-off valve (F13) is arranged on the low-temperature side water inlet main pipe (L4) and between every two adjacent low-temperature side water inlet branch pipes (L15);
a first bypass branch pipe (L16) is further arranged between the high-temperature sides of every two adjacent heat exchangers (R), a second bypass branch pipe (L17) is arranged between the low-temperature sides, one end of each first bypass branch pipe (L16) is communicated with the high-temperature side water inlet main pipe (L1) and is positioned at the downstream side of a corresponding tenth shutoff valve (F10), the other end of each first bypass branch pipe is communicated with the high-temperature side water outlet main pipe (L2) and is positioned at the upstream side of a corresponding eleventh shutoff valve (F11), one end of each second bypass branch pipe (L17) is communicated with the low-temperature side water outlet main pipe (L3) and is positioned at the upstream side of a corresponding twelfth shutoff valve (F12), and the other end of each second bypass branch pipe (L17) is communicated with the low-temperature side water inlet main pipe (L4) and is positioned at the downstream side of a corresponding thirteenth shutoff valve (F13); and each first bypass branch pipe (L16) is provided with a fourteenth shutoff valve (F14), and each second bypass branch pipe (L17) is provided with a fifteenth shutoff valve (F15).
3. The heating unit energy-saving reconstruction system of claim 2, characterized in that: the secondary net return water main pipe (L7) is communicated with the tenth branch pipe (L10) and the eleventh branch pipe (L11) through at least two filtering devices (GF) which are connected in parallel.
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| CN202020583703.2U CN211925872U (en) | 2020-04-17 | 2020-04-17 | Energy-saving reconstruction system of heat supply unit |
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| CN202020583703.2U CN211925872U (en) | 2020-04-17 | 2020-04-17 | Energy-saving reconstruction system of heat supply unit |
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