CN220269552U - Temperature regulating system of middle-deep geothermal buried pipe system - Google Patents
Temperature regulating system of middle-deep geothermal buried pipe system Download PDFInfo
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- CN220269552U CN220269552U CN202321998712.8U CN202321998712U CN220269552U CN 220269552 U CN220269552 U CN 220269552U CN 202321998712 U CN202321998712 U CN 202321998712U CN 220269552 U CN220269552 U CN 220269552U
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 194
- 238000000034 method Methods 0.000 claims description 4
- 230000033228 biological regulation Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 238000005086 pumping Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 2
- 239000008399 tap water Substances 0.000 description 2
- 235000020679 tap water Nutrition 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
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- 238000010438 heat treatment Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
The utility model relates to the technical field of ground source heat pump air conditioners, in particular to a temperature regulating system of a middle-deep geothermal buried pipe system, which comprises a heat pump unit, wherein the heat pump unit consists of an evaporator and a condenser; the condenser is connected with the working loop; the evaporator is connected with a heat exchange loop, the heat exchange loop is connected with a buried pipe mechanism, the heat exchange loop comprises a water outlet pipeline and a water return pipeline, and a first circulating water pump is arranged on the water return pipeline; the second water return pipeline is arranged between the water outlet pipeline and the water return pipeline, and is provided with a second circulating water pump which is connected with the first circulating water pump in parallel, so that the second water return pipeline becomes an independent loop, when circulation is started, the independent water return pipeline can be operated independently, the whole machine can be ensured to operate normally, and then hot water exchanged from the buried pipe is gradually added into the circulation, so that the whole machine cannot be started due to high-temperature protection.
Description
Technical Field
The utility model relates to the technical field of ground source heat pump air conditioners, in particular to a temperature regulating system of a middle-deep geothermal buried pipe system.
Background
The deeper the earth is, the higher the temperature is, the lower the temperature gradient is about 3 ℃/100 m. The middle-deep geothermal energy is utilized by two types of hydrothermal (pumping water and recharging) and buried pipe type. The water heat type is composed of a pumping geothermal well and a recharging geothermal well, the recharging difficulty is closely related to the local geological structure and water quality, and the risk of being incapable of long-term recharging of 100% exists, so that the technology is applied at a certain risk.
An annular gap with a certain width is arranged between the outer wall of the buried pipe of the geothermal buried pipe and the well wall, and the whole pipe is required to be plugged up and down by a well cementation technology, so that an intermediate water layer on which people depend to live is protected from being polluted. The geothermal buried pipe is a closed circulation system, only exchanges heat, does not get water, is currently used for building heating, and is a new environment-friendly, low-carbon, environment-friendly and energy-saving technology which is a brand-name brand-new technology.
The medium-deep (non-interference) buried pipe has a buried depth of 2000 m-3000 m, and heat exchange with surrounding rock and soil is realized through closed circulation of underground buried pipe fluid. The heat exchange capacity and water inlet and outlet temperatures of the geothermal buried pipe system change along with load, operation time and seasonal changes, and the water outlet temperature is generally 50-20 ℃. The water outlet temperature of the geothermal buried pipe gradually decreases along with the increase of the running time, and even the phenomenon that the heat pump unit cannot be started due to the excessively high water outlet temperature in the initial stage of heat supply occurs. Under the condition of normal heat extraction, the water inlet and outlet temperature of the heat pump buried pipe is 10 ℃/25 ℃. The heat pump unit is further required to work to produce hot water at 45-60 ℃ so as to be used as a heat source of heat supply and air conditioning.
The water inlet temperature of the evaporator of the heat pump unit is generally 15-10 ℃, and the water inlet temperature is generally not more than 25 ℃; the temperature difference of water inlet and outlet is 3-10 ℃, and a set value (generally 18 ℃/10 ℃) is provided for the design of the heat pump unit and the water inlet and outlet temperature of an evaporator for the consideration of safety, reliability, high efficiency and energy saving of the system;
in order to match the heat pump unit with the geothermal buried pipe system, a set of temperature regulation measures are necessary, and the prior art has the methods of electric bypass valve water mixing regulation and water tank water mixing temperature regulation.
Fig. 2 shows a schematic diagram of temperature regulation in the prior art, wherein a heat pump unit 1, a water outlet pipeline 81, a water return pipeline 82 and a buried pipe mechanism 2 form a cycle, a first circulating water pump 81 is arranged on the water return pipeline 82, and an electric bypass valve 51 is arranged between the water outlet pipeline 81 and the water return pipeline 82 to control flow, regulate water temperature in the water return pipeline 82, and the mixed water pump is regenerated into an evaporator 11 of the pump unit 1 through the first circulating water pump 81.
The drawbacks of the above prior art are:
1. before the circulation is started, the water temperature in the buried pipe can reach a high value due to sufficient heat exchange, after the circulation is started, the high value can gradually decrease along with the change of the flow speed and the geothermal energy and tends to a stable value, but when the circulation is just started, the higher water temperature flows back into the evaporator 11, even if the temperature is reduced to a certain degree through the electric bypass valve 51, the high-temperature protection of the evaporator 11 is still started, so that the heat pump unit 1 cannot be started, and the prior art is started by adopting a temporary tap water (at low temperature) method, and obviously, the resource is wasted and the energy is not saved;
2. all the returned water is circulated by a circulating water pump, and the medium-deep buried pipe is buried deeply, so that a water pump with large lift is needed, and the whole energy is high.
Disclosure of Invention
In order to solve the problems, the utility model provides a temperature regulating system of a middle-deep geothermal buried pipe system.
The object of the utility model is achieved in the following way: the temperature regulating system of the medium-deep geothermal buried pipe system comprises a heat pump unit 1, wherein the heat pump unit 1 consists of an evaporator 11 and a condenser 12;
the condenser 12 is connected with a working circuit;
the evaporator 11 is connected with a heat exchange loop 8, the heat exchange loop is connected with the buried pipe mechanism 2, the heat exchange loop 8 comprises a water outlet pipeline 81 and a water return pipeline 82, and the water return pipeline 82 is provided with a first circulating water pump 4;
a second water return pipeline 83 is arranged between the water outlet pipeline 81 and the water return pipeline 82, and the second water return pipeline 83 is provided with a second circulating water pump 5 which is connected with the first circulating water pump 4 in parallel, so that the second water return pipeline 83 becomes an independent loop.
Further, the lift of the first circulating water pump 4 is larger than that of the second circulating water pump 5.
Further, the first circulating water pump 4 and the second circulating water pump 5 are variable-frequency water pumps.
Further, the water outlet pipeline 81 is provided with a temperature sensor 6; a water return pipeline 82 between the buried pipe mechanism 2 and the first circulating water pump 4 is provided with a temperature sensor 6; the water return line 82 is provided with a temperature sensor 6 at one end close to the evaporator 11.
Compared with the prior art, the temperature adjusting structure is characterized in that the electric bypass valve is used for integrally pumping all circulating water back through the circulating water pump, an independently operated water return pipeline is additionally arranged, an independent second circulating water pump is arranged for the pipeline, when circulation begins, the independent water return pipeline can be independently operated, the normal operation of the whole machine is ensured, and then hot water exchanged from the buried pipe is gradually added into the circulation, so that the whole machine cannot be started due to high-temperature protection.
Drawings
FIG. 1 is a schematic diagram of the temperature regulation of the present utility model;
fig. 2 is a schematic diagram of a prior art tempering.
1, a heat pump unit; 11 an evaporator; a 12 condenser; 2, a buried pipe mechanism; 3, a wellhead device; 4, a first circulating water pump; 5 a second circulating water pump; 51 an electric bypass valve; 6, a temperature sensor; 7, controlling a cabinet; 8, a heat exchange loop; 81 water outlet pipelines; 82 return lines; 83 a second return line.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the present utility model, unless explicitly specified and limited otherwise, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., are used for convenience of description and for simplifying the description only with respect to the orientation or positional relationship shown in the drawings, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model.
It should be noted that the temperatures shown in the drawings are only for convenience of explanation and understanding, and are not limiting of the present utility model.
Fig. 2 shows a schematic diagram of temperature regulation in the prior art, wherein a heat pump unit 1, a water outlet pipeline 81, a water return pipeline 82 and a buried pipe mechanism 2 form a cycle, a first circulating water pump 81 is arranged on the water return pipeline 82, and an electric bypass valve 51 is arranged between the water outlet pipeline 81 and the water return pipeline 82 to control flow, regulate water temperature in the water return pipeline 82, and the mixed water pump is regenerated into an evaporator 11 of the pump unit 1 through the first circulating water pump 81.
The drawbacks of the above prior art are:
1. before the circulation is started, the water temperature in the middle-deep buried pipe can reach a high value due to sufficient heat exchange, after the circulation is started, the high quality can gradually decrease along with the change of the flow speed and the geothermal energy and tends to a stable value, but when the circulation is just started, the higher water temperature flows back into the evaporator 11, and even if the temperature is reduced to a certain extent through the electric bypass valve 51, the high-temperature protection of the evaporator 11 is still started, so that the heat pump unit 1 cannot be started, the prior art is started by a method of temporarily connecting low-temperature tap water and the like, but obviously, resources are wasted and energy is not saved;
2. all the returned water is circulated by a circulating water pump, and the medium-deep buried pipe is buried deeply, so that a water pump with large lift is needed, and the whole energy is high.
As shown in fig. 1, a temperature regulating system of a medium-deep geothermal buried pipe system comprises a heat pump unit 1, wherein the heat pump unit 1 consists of an evaporator 11 and a condenser 12;
the condenser 12 is connected with a working circuit;
the evaporator 11 is connected with a heat exchange loop 8, the heat exchange loop is connected with the buried pipe mechanism 2, the heat exchange loop 8 comprises a water outlet pipeline 81 and a water return pipeline 82, and the water return pipeline 82 is provided with a first circulating water pump 4;
a second water return pipeline 83 is arranged between the water outlet pipeline 81 and the water return pipeline 82, and the second water return pipeline 83 is provided with a second circulating water pump 5 which is connected with the first circulating water pump 4 in parallel, so that the second water return pipeline 83 becomes an independent loop.
In detail, the parallel connection means that, as shown in the figure, the water outlet pipe 81 is provided with a branch, namely a second water return pipe 83, which is connected to the water return pipe 82 between the output end of the first circulating water pump 4 and the input end of the evaporator 11, so that the water output by the second water return pipe 83 does not pass through the water return pipe 82 any more, but the cold water is mixed with the heat-exchanged hot water pumped back by the first circulating water pump 4 after being pumped back by the second circulating water pump 5, and then flows back into the evaporator 11.
The temperature adjusting structure is formed by integrally pumping all circulating water back through the electric bypass valve 51 and the first circulating water pump 4, so that the temperature adjusting structure is improved to be additionally provided with a second circulating water pipeline 83 which runs independently, and the second circulating water pump 5 is arranged for the pipeline, when circulation begins, the second circulating water pipeline 83 can be independently run firstly, the whole machine can be ensured to run normally, and then hot water exchanged from a buried pipe is gradually added into the circulation, so that the whole machine cannot be started due to high-temperature protection.
Further, the lift of the first circulating water pump 4 is larger than the lift of the second circulating water pump 5, and the first circulating water pump 4 pumps the water of the buried pipe mechanism 2 back, so that a large lift water pump is needed, and the second circulating water pump 5 directly sends the water of the water outlet pipeline 81 to the water return pipeline 82, so that the small lift water pump can meet the requirement, preferably, the lift of the first circulating water pump 4 is 80 meters, and the lift of the second circulating water pump 5 is 12 meters.
The second circulating water pump 5 with small lift shares the work of pumping part of water, so the energy-saving effect can be achieved.
Assume that: the flow rate of the evaporator 11 of the heat pump unit 1 is 300t/h, the water inlet and outlet temperature of the evaporator 11 is 18/10 ℃, and the water inlet and outlet temperature of the buried pipe mechanism 2 is 10/25 ℃. By adopting the scheme of the utility model, the second circulating water pump 5 has a lift of 12m, a flow of 140t/h, the first circulating water pump 4 has a lift of 80m, a flow of 160t/h, the water pump efficiency is 75%, and the water pump energy consumption is 39.45kW; by adopting the scheme in the prior art of FIG. 2, the first circulating water pump 4 has a lift of 80m, a flow of 300t/h, a water pump energy consumption of 65.39kW, an energy saving amount of 25.94kW and an energy saving rate of 39.7%.
The above is only an energy saving effect of one embodiment, the actual effect depends on the specific parameters of the system.
Further, the first circulating water pump 4 and the second circulating water pump 5 are variable-frequency water pumps, so that the flow rates can be conveniently adjusted according to different working conditions.
Further, the water outlet pipeline 81 is provided with a temperature sensor 6; a water return pipeline 82 between the buried pipe mechanism 2 and the first circulating water pump 4 is provided with a temperature sensor 6; the water return line 82 is provided with a temperature sensor 6 at one end close to the evaporator 11.
Further, the heat pump unit 1, the first circulating water pump 4, the second circulating water pump 5 and the temperature sensor 6 are all electrically connected with the controller 7, and are integrally adjusted by the controller, so that the technology of integral work adjustment through temperature feedback belongs to the mature prior art, and the description is omitted here.
As an example:
1. the water inlet and outlet temperature of the geothermal buried pipe system changes with load, time and seasons, the water outlet temperature of the geothermal buried pipe of 2000-3000 m is 50-20 ℃, and hot water at 45-60 ℃ is prepared through the heat pump unit 1; the water inlet temperature of the evaporator 11 of the heat pump unit 1 is generally 15-10 ℃, the water inlet temperature is generally not more than 25 ℃, and the water inlet and outlet temperature difference is 3-10 ℃. The second circulating water pump 5 is arranged, and in detail shown in figure 1, the water discharged from the evaporator 11 is mixed with the water discharged from the geothermal buried pipe 2 through the second circulating water pump 5 and then enters the evaporator 11, so that the requirements of the water inlet temperature and water quantity of the heat pump evaporator 11 can be met;
2. in order to adapt to the design temperature, a second circulating water pump 5 is arranged, low-temperature water outlet (10 ℃) of the evaporator of a part of heat pump unit 1 is mixed with high-temperature water outlet (25 ℃) of the geothermal buried pipe 2, and the proportion of primary water to secondary water is adjusted to reach the design temperature of 18 ℃;
3. the first circulating water pump 4 and the second circulating water pump 5 of the geothermal buried pipe are both frequency-converted, the proportion of primary water to secondary water is controlled according to the temperature, the water inlet and outlet temperature of the evaporator 11 is adjusted to 18/10 ℃ under the efficient energy-saving working condition, and the adjustment is flexible and convenient;
4. the second circulating water pump 5 is started before the heat pump unit 1 is started, and when the water temperature and the water quantity reach the starting requirement of the heat pump unit 1, the heat pump unit 1 and the primary circulating water pump 4 are synchronously and gradually started, so that the system is safe, reliable, efficient and energy-saving.
The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that it will be apparent to those skilled in the art that several changes and modifications can be made without departing from the general inventive concept, and these should also be regarded as the scope of the utility model.
Claims (4)
1. The temperature regulating system of the medium-deep geothermal buried pipe system comprises a heat pump unit (1), wherein the heat pump unit (1) consists of an evaporator (11) and a condenser (12);
the condenser (12) is connected with a working loop;
the evaporator (11) is connected with a heat exchange loop (8), the heat exchange loop is connected with a buried pipe mechanism (2), the heat exchange loop (8) comprises a water outlet pipeline (81) and a water return pipeline (82), and a first circulating water pump (4) is arranged on the water return pipeline (82);
the method is characterized in that: a second water return pipeline (83) is arranged between the water outlet pipeline (81) and the water return pipeline (82), and the second water return pipeline (83) is provided with a second circulating water pump (5) which is connected with the first circulating water pump (4) in parallel, so that the second water return pipeline (83) becomes an independent loop.
2. A temperature regulating system for a mid-deep geothermal buried pipe system according to claim 1, characterized in that: the lift of the first circulating water pump (4) is larger than that of the second circulating water pump (5).
3. A temperature regulating system for a mid-deep geothermal buried pipe system according to claim 2, characterized in that: the first circulating water pump (4) and the second circulating water pump (5) are variable-frequency water pumps.
4. A temperature regulating system for a mid-deep geothermal buried pipe system according to claim 3, characterized in that: the water outlet pipeline (81) is provided with a temperature sensor (6); a water return pipeline (82) between the buried pipe mechanism (2) and the first circulating water pump (4) is provided with a temperature sensor (6); one end of the water return pipeline (82) close to the evaporator (11) is provided with a temperature sensor (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321998712.8U CN220269552U (en) | 2023-07-27 | 2023-07-27 | Temperature regulating system of middle-deep geothermal buried pipe system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321998712.8U CN220269552U (en) | 2023-07-27 | 2023-07-27 | Temperature regulating system of middle-deep geothermal buried pipe system |
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| CN220269552U true CN220269552U (en) | 2023-12-29 |
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| CN202321998712.8U Active CN220269552U (en) | 2023-07-27 | 2023-07-27 | Temperature regulating system of middle-deep geothermal buried pipe system |
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| CN (1) | CN220269552U (en) |
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- 2023-07-27 CN CN202321998712.8U patent/CN220269552U/en active Active
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