CN108072088B - Peak regulating system of electric heating pump of central heating secondary network - Google Patents
Peak regulating system of electric heating pump of central heating secondary network Download PDFInfo
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- CN108072088B CN108072088B CN201611003386.7A CN201611003386A CN108072088B CN 108072088 B CN108072088 B CN 108072088B CN 201611003386 A CN201611003386 A CN 201611003386A CN 108072088 B CN108072088 B CN 108072088B
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- 238000005485 electric heating Methods 0.000 title claims abstract description 42
- 230000001105 regulatory effect Effects 0.000 title claims abstract description 36
- 238000010438 heat treatment Methods 0.000 title claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 146
- 230000008092 positive effect Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Steam Or Hot-Water Central Heating Systems (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The utility model provides a centralized heating secondary network electric heat pump peak regulation system, includes that primary network supplies, return water pipeline, secondary network supply, return water pipeline, plate heat exchanger, the improvement of doing is: an electric heating pump peak regulating unit is additionally arranged at the secondary network backwater inlet end of the plate heat exchanger and comprises a tube shell heat exchanger, an electric heating pump, a tube shell heat exchanger, an inner circulating water pipe of the electric heating pump evaporator and an inner circulating pump on the inner circulating water pipe, wherein a tube side inlet of the tube shell heat exchanger is connected with the primary network side outlet end of the plate heat exchanger, a tube side outlet of the tube shell heat exchanger is connected with the primary network backwater pipe, and an electric heating pump condenser is connected on the backwater pipe of the secondary network backwater inlet end of the plate heat exchanger in series. The invention has the positive effects that: under the condition that the water supply parameters of the primary network are unchanged, the water supply and return temperature of the secondary network can be rapidly increased, and different peak regulation requirements of heat users under the primary network are met. Realizes the gradient utilization of the heat energy of the primary and secondary nets at high, medium and low temperatures.
Description
Technical Field
The invention belongs to the field of heat supply, and particularly relates to secondary network peak shaving of a cogeneration central heating system.
Background
In the beginning and end of heating, the heat demand of the secondary network heat user is small, the requirements on the water supply temperature of the primary network and the secondary network are not high, and the temperature difference of the secondary network water supply and return water is maintained at about 5 ℃, so that the heat demand of the secondary network heat user can be met. In the severe cold period of heating, along with the increase of the heat demand of the secondary network heat user, the water supply temperature of the secondary network needs to be improved, and the water supply and return temperature difference of the secondary network is maintained at about 10 ℃, so that the peak regulation heat supply demand of the secondary network heat user can be met only by greatly improving the water supply temperature of the primary network heat supply initial end.
The cogeneration central heating system adopts a mode of increasing the water supply temperature of a primary network to peak shaving of a secondary network, and has the following problems. Firstly, peak regulation is performed in the mode, because the water supply temperature of the primary net is about 40-60 ℃ higher than the water return temperature of the secondary net, the secondary net water with lower temperature is directly heated by adopting the water supply of the primary net with higher temperature, and a large amount of high-quality heat energy of the primary net is required to be consumed. Secondly, the peak shaving method has poor flexibility. Typically, there are hundreds of heat exchange stations within the jurisdiction of the primary network. The heat utilization period of each group of heat users connected into the secondary network, the water supply temperature of the secondary network and the water supply and return temperature difference of the secondary network are greatly different, and the phenomenon of a large Mala trolley is unavoidable only by adopting a peak regulation mode of improving the water supply temperature of the primary network to the secondary network.
Disclosure of Invention
The invention aims to provide a peak regulation system of a central heating secondary network electric heating pump, which overcomes the defects of the existing central heating system that the water supply temperature of a primary network is greatly improved to the peak regulation of the secondary network.
The invention relates to a peak regulation system of a central heating secondary network electric heating pump, which comprises a primary network water supply pipeline, a primary network water return pipeline, a secondary network water supply pipeline, a secondary network water return pipeline, a plate heat exchanger between a primary network and a secondary network circulating pump which are arranged in a heat exchange station, wherein the improvement is that: the electric heating pump peak regulating unit for heating the secondary network backwater by utilizing the heat of the primary network backwater is additionally arranged, and the electric heating pump peak regulating unit comprises: the electric heat pump peak shaving unit comprises a peak shaving heat exchanger, an electric heat pump, an inner circulating water pipe connected with one side of an electric heat pump of the peak shaving heat exchanger and an evaporator of the electric heat pump, and an inner circulating pump arranged on the inner circulating water pipe, wherein a heat source water inlet of the peak shaving heat exchanger in the electric heat pump peak shaving unit is connected with an outlet of a primary network side of the plate heat exchanger through a water pipe or a connector, a heat source water outlet of the peak shaving heat exchanger is connected with a primary network return pipe, a water outlet of the electric heat pump condenser is connected with a return water inlet of a secondary network side of the plate heat exchanger through a water pipe or a connector, and a water inlet of the electric heat pump condenser is connected with the secondary network return pipe.
The above is a basic technical scheme of the invention.
In the invention, a shell-and-tube heat exchanger is selected as a peak-shaving heat exchanger, one or more shell-side middle section outlets are added in the middle of a shell side of the shell-and-tube heat exchanger, a tube side inlet of the shell-and-tube heat exchanger is connected with an outlet on a primary network side of a plate heat exchanger through a water pipe or a connector, a tube side outlet of the shell-and-tube heat exchanger is connected with a primary network return pipe, the tube side outlet of the shell-and-tube heat exchanger and the outlet at the tail end of the shell side are connected with a water pipe and are collected on a multi-pass electric flow regulating valve, a water pipe is connected between the shell side inlet and the outlet of the multi-pass electric flow regulating valve, a circulating channel is formed by connecting the water pipe with an outlet and a water inlet of an electric heating pump evaporator, low-temperature circulating water is filled in the circulating channel, and an internal circulating pump is arranged on the water pipe in the circulating channel.
In the shell-and-tube heat exchanger, a shell side middle section outlet is added in the middle of a shell side, and the added shell side middle section outlet and an outlet at the tail end of the shell side are connected with a water pipe and are converged into a three-way electric flow regulating valve, and the outlet of the three-way electric flow regulating valve is connected with a water inlet of an electric heat pump evaporator through a water pipe or a connector.
The multi-way flow regulating valve is regulated by an electric controller, and the electric controller comprises temperature sensors arranged at each inlet and each outlet of the multi-way flow regulating valve, and a control module connected with the temperature sensors and the electric valve.
The working process of the invention is as follows: firstly, the high-temperature water of the primary net is sent to a water inlet of a primary net flow regulating valve in a heat exchange station along a primary net water supply pipeline, the temperatures of a primary net side and a water outlet of the plate heat exchanger and a secondary net side and a water outlet of the plate heat exchanger are measured through a primary net flow regulating valve controller, the opening proportion of the primary net flow regulating valve is regulated, the high-temperature water of the primary net is controlled to the optimal proportion of heat exchange with the secondary net, then flows out from an outlet of the primary net flow regulating valve, enters a primary net side water inlet of the plate heat exchanger through a connecting pipeline, the heat of the high-temperature water of the primary net is transferred to the secondary net backwater of the plate heat exchanger after the secondary net side of the plate heat exchanger is heated by an electric heating pump peak regulating unit, thereby the temperature of the high-temperature water of the primary net is reduced to become the water in the primary net, the medium-temperature heat energy absorbed by the primary network side of the electric heat pump peak shaving unit is converted into high-temperature heat energy which is led into secondary network backwater by a voltage compressor arranged in the electric heat pump peak shaving unit, thereby the temperature of the warm water in the primary network is reduced to become primary network low-temperature water, the primary network low-temperature water flows out from the primary network side water outlet of the electric heat pump peak shaving unit, and the primary network backwater main system is fed out from a primary network backwater pipeline of the heat exchange station to complete primary cascade heat exchange of the primary network high-temperature water and the secondary network backwater.
Meanwhile, the secondary network circulating pump arranged on the secondary network water return pipeline in the heat exchange station provides pipeline circulating power, the secondary network water with higher temperature is supplied to the heat user water inlet outside the heat exchange station, after heat exchange with the heat user is completed, the secondary network water with lower temperature is supplied to the heat user water outlet, and flows out through the heat user water outlet to form secondary network backwater, and the secondary network backwater is sent to the secondary network side water inlet of the electric heating pump peaking unit in the heat exchange station along the secondary network water return pipeline, the warm water heat energy in the primary network absorbed by the primary network side of the electric heating pump peaking unit is converted into the secondary network high-temperature heat energy of the electric heating pump peaking unit, the secondary network backwater heated in the electric heating pump peaking unit flows out through the secondary network side water outlet of the electric heating pump peaking unit, and flows out through the secondary network water inlet of the plate heat exchanger through the secondary network water return pipeline, and becomes the secondary network water inlet of the primary network high-temperature water of the plate heat exchanger after the heat energy is absorbed, and flows out through the secondary network water inlet of the plate heat exchanger, and the secondary network water outlet of the heat exchanger is sent to the heat exchange station through the secondary network water inlet of the heat exchange pipeline, and the heat exchange station is completed.
The invention has the positive effects that:
1. The heat of the warm water in the primary network is extracted by the electric heating pump peak shaving unit to carry out peak shaving on the secondary network, so that the traditional operation mode that the peak shaving can be carried out on the secondary network only by improving the water supply temperature of the heat supply initial end of the primary network is changed. The peak regulation mode has the characteristics of quick response and flexible start and stop, and can rapidly improve the water supply and return temperature of the secondary network under the condition that the water supply parameters of the primary network are unchanged according to the actual requirements of each heat user, so as to meet the different peak regulation requirements of the secondary network heat user under the primary network;
2. Compared with the traditional mode of increasing the water supply temperature of the primary network to the peak regulation of the secondary network, the peak regulation mode reduces the heat exchange temperature difference between the high-temperature water supply of the primary network and the backwater of the secondary network, the backwater of the secondary network is heated by the electric heating pump peak regulation unit firstly and then enters the plate heat exchanger to exchange heat with the high-temperature water of the primary network, namely 60 percent of heat of the secondary network is exchanged from the high-temperature water of the primary network through the plate heat exchanger, 40 percent of heat of the secondary network is supplemented by the heat energy of the warm water in the primary network absorbed by the electric heating pump peak regulation unit, and the high-quality heat energy consumption of the primary network can be reduced by about 40 percent through the peak regulation mode;
3. The peak shaving system realizes the gradient utilization of high, medium and low temperature heat energy of the primary network and the secondary network. The primary net medium-temperature water and the secondary net backwater heated by the electric heating pump peak shaving unit directly exchange heat, and the primary net medium-temperature water and the low-temperature circulating water of the electric heating pump unit evaporator directly exchange heat, and the high-temperature water and the secondary net backwater with lower temperature prepared by the electric heating pump unit condenser directly exchange heat;
4. In peak regulation period, the secondary net backwater is heated by the electric heat pump peak regulating unit preferentially because the temperature of the secondary net backwater is about 10 ℃ lower than that of the secondary net water supply. Firstly, compared with the secondary network water supply with higher heating temperature, the system energy efficiency of the electric heating pump peak shaver set can be improved; secondly, compared with the secondary network water supply with higher preferential heating temperature, the condensation temperature of the electric heating pump peak regulating unit is reduced, so that the scaling of the inner pipe wall of the condenser is greatly reduced;
5. because the electric heating pump peak shaver set needs to be connected in series with the medium-temperature water return pipeline of the primary network, the influence on the resistance of the primary network is related to the hydraulic balance of the original central heating system, and because the resistance of the shell-and-tube heat exchanger arranged in the electric heating pump peak shaver set is over 50 percent lower than that of the plate heat exchanger, the influence on the hydraulic balance of the primary network is reduced;
6. the low-temperature heat for peak regulation is intensively supplemented by the primary network heating initial end, so that the low-grade heat source of a heat source plant can be fully excavated, the environment-friendly treatment of the supplementing mode is facilitated, and the method has important significance for relieving the winter soot type atmospheric pollution of northern cities.
Drawings
Fig. 1 is a schematic view of a heating system according to the present invention.
In the figure: the system comprises a primary network water supply pipeline 1, a primary network water return pipeline 2, a plate heat exchanger 3, an electric heating pump peak regulating unit 4, a primary network water return pipeline 5, a secondary network water supply pipeline 6, a heat user 7, a secondary network water return pipeline 8 and a secondary network circulating pump 9.
Fig. 2 is a schematic diagram of the peak shaver set structure of the electric heating pump.
In the figure: 4-1 is a shell-and-tube heat exchanger, 4-2 is an electric heat pump, 4-2-1 is an electric heat pump evaporator, 4-2-2 is an electric heat pump condenser, 4-3 is an internal circulating water pipe of an electric heat pump peak shaver set, and 4-4 is an internal circulating pump of the electric heat pump peak shaver set.
Fig. 3 is a schematic view of a shell-and-tube heat exchanger used in the present invention.
Wherein: 4-1-1 is a shell-and-tube heat exchanger shell, 4-1-2 is a tube pass channel tube group, 4-1-3 is a shell pass deflector, 4-1-4 is a tube pass water inlet, 4-1-5 is a tube pass water outlet, 4-1-6 is a shell pass water inlet, 4-1-7 is a shell pass middle section water outlet, 4-1-8 is a shell pass tail end water outlet, and 4-1-9 is a three-way flow regulating valve.
Fig. 4 is a block diagram of a multi-pass electric flow regulator valve electric controller for use in the present invention.
Detailed Description
Referring to fig. 1, the peak shaving system of the electric heating pump of the central heating secondary network of the invention comprises: the primary net water supply pipeline 1 and the water return pipeline 2, the secondary net water supply pipeline 6 and the water return pipeline 8, the plate heat exchanger 3 between the primary net and the secondary net circulating pump 9 are arranged in the heat exchange station. The improvement is that: an electric heating pump peak regulating unit 4 for heating the secondary network backwater by utilizing the heat of the primary network backwater is added.
Referring to fig. 2, the electric heating pump peak shaver set 4 comprises a shell-and-tube heat exchanger 4-1, an electric heating pump 4-2, an inner circulating water tube 4-3 connecting the shell-and-tube heat exchanger and the electric heating pump 4-2, low-temperature circulating water injected into the inner circulating water tube, and an inner circulating pump 4-4 arranged on the inner circulating water tube, wherein a tube side inlet of the shell-and-tube heat exchanger 4-1 in the electric heating pump peak shaver set 4 is connected with a primary network side outlet end of the plate heat exchanger 3 through a water tube, a tube side outlet of the shell-and-tube heat exchanger 4-1 is connected with a primary network return water pipeline 2, a water outlet of the electric heating pump condenser 4-2-2 is connected with a secondary network return water inlet of the plate heat exchanger 3 through a water tube, and a water inlet of the electric heating pump condenser 4-2-2 is connected with a secondary network return water pipeline 8.
Referring to fig. 3, a shell side middle section outlet 4-1-7 is added in the shell side middle section of a shell side heat exchanger 4-1 used in the invention, the added shell side middle section outlet 4-1-7 is connected with an outlet 4-1-8 at the tail end of the shell side through a water pipe and is converged on a three-way flow regulating valve 4-1-9, and an outlet of the three-way flow regulating valve 4-1-9 is connected with a water inlet of an electric heat pump evaporator 4-2-1. The tube side inlets 4-1-4 of the tube side heat exchanger are connected with the primary net outlet of the plate heat exchanger 3 through water pipes. The tube side outlet 4-1-5 of the tube shell heat exchanger 4-1 is connected with the primary network water return pipeline 2. The shell side inlet 4-1-6 of the shell-and-tube heat exchanger is connected with the water outlet of the evaporator 4-2-1 in the electric heat pump 4-2 through the inner circulating pipe 4-4. A temperature sensor is arranged on the middle section outlet 4-1-7 of the shell-and-tube heat exchanger 4-1 or the water pipe between the middle section outlet and the three-way flow regulating valve 4-1-9. And a temperature sensor is arranged on the outlet 4-1-8 at the tail end of the shell side or a water pipe between the outlet and the three-way flow regulating valve 4-1-9. The temperature sensor is connected with the control module. The control output of the control module is connected with three-way flow regulating valves 4-1-9.
The three-way flow regulating valve controller adjusts the flow ratio of the middle outlet 4-1-7 and the tail end outlet 4-1-8 of the shell side of the shell-and-tube heat exchanger 4-1 entering the flow regulating valve according to the set constant temperature of the outlet.
Claims (2)
1. A peak shaving system for a central heating secondary network electric heating pump, comprising: the device comprises a primary net water supply pipeline, a primary net water return pipeline, a secondary net water supply pipeline, a secondary net water return pipeline, a plate heat exchanger between a primary net and a secondary net circulating pump which are arranged in a heat exchange station, and is characterized in that: the electric heating pump peak regulating unit for heating the secondary network backwater by utilizing the heat of the primary network backwater is additionally arranged, and the electric heating pump peak regulating unit comprises: the system comprises a peak shaving heat exchanger, an electric heat pump, an inner circulating water pipe connected with one side of an electric heat pump of the peak shaving heat exchanger and an evaporator of the electric heat pump, and an inner circulating pump arranged on the inner circulating water pipe, wherein a heat source water inlet of the peak shaving heat exchanger in the electric heat pump peak shaving unit is connected with an outlet of a primary network side of the plate heat exchanger through a water pipe or a connector, a heat source water outlet of the peak shaving heat exchanger is connected with a primary network return pipe, a water outlet of a condenser of the electric heat pump is connected with a return water inlet of a secondary network side of the plate heat exchanger through a water pipe or a connector, and a water inlet of the condenser of the electric heat pump is connected with the secondary network return pipe;
The peak-shaving heat exchanger is a shell-and-tube heat exchanger, one or more shell side middle section outlets are added in the middle of a shell side of the shell-and-tube heat exchanger, a tube side inlet of the shell-and-tube heat exchanger is connected with an outlet of a primary net side of the plate heat exchanger through a water pipe or a connector, a tube side outlet of the shell-and-tube heat exchanger is connected with a primary net return pipe, a tube side middle section outlet of the shell side on the shell-and-tube heat exchanger is connected with an outlet of a tail end of the shell side and is converged on a multi-pass electric flow regulating valve, an inner circulation channel is formed by connecting the shell side inlet, the multi-pass electric flow regulating valve outlet and the water pipe between the shell side inlet and the water outlet of the electric heating pump evaporator, low-temperature circulating water is filled in the circulation channel, and an inner circulation pump is arranged on the water pipe in the circulation channel.
2. The peak shaving system of the central heating secondary network electric heating pump according to claim 1, wherein: the shell side middle part of the shell side heat exchanger is added with a shell side middle section outlet, the added shell side middle section outlet and the outlet at the tail end of the shell side are connected with a water pipe and are converged into a three-way electric flow regulating valve, and the outlet of the three-way electric flow regulating valve is connected with the inlet of the electric heat pump evaporator through a water pipe or a connector.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611003386.7A CN108072088B (en) | 2016-11-15 | 2016-11-15 | Peak regulating system of electric heating pump of central heating secondary network |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611003386.7A CN108072088B (en) | 2016-11-15 | 2016-11-15 | Peak regulating system of electric heating pump of central heating secondary network |
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| CN108072088A CN108072088A (en) | 2018-05-25 |
| CN108072088B true CN108072088B (en) | 2024-05-14 |
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| CN201611003386.7A Active CN108072088B (en) | 2016-11-15 | 2016-11-15 | Peak regulating system of electric heating pump of central heating secondary network |
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| CN111765509B (en) * | 2020-07-01 | 2021-02-26 | 河北工业大学 | Distributed wind-solar complementary bidirectional energy supply station |
| CN112577100B (en) * | 2020-11-26 | 2021-12-10 | 清华大学 | Heating compensation method and device and readable storage medium |
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| CN108072088A (en) | 2018-05-25 |
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