CN210425210U

CN210425210U - Secondary pump system for medium-deep geothermal source heat pump

Info

Publication number: CN210425210U
Application number: CN201920781301.0U
Authority: CN
Inventors: 董翔; 陈永平; 周聪; 郭占强
Original assignee: Ccig Xinyuan Tianjin Technology Co ltd
Current assignee: Ccig Xinyuan Tianjin Technology Co ltd
Priority date: 2019-05-28
Filing date: 2019-05-28
Publication date: 2020-04-28
Anticipated expiration: 2029-05-28

Abstract

The application discloses secondary pump system for middle and deep geothermal source heat pump belongs to geothermol power technical field, secondary pump system for middle and deep geothermal source heat pump includes middle and deep geothermal well, primary pump, A heat pump set and B heat pump set, a serial communication port, middle and deep geothermal well, primary pump, A heat pump set's evaporimeter and B heat pump set's evaporimeter loop through pipeline series connection becomes closed circuit, and A heat pump set and B heat pump set pass through the pipeline respectively with a secondary pump and constitute parallel structure, its puzzlement problem that can solve system efficiency and high temperature heat source and utilize, realize middle and deep geothermal well and heat pump set decoupling zero, reach the purpose of system energy saving, be applicable to the high temperature heat source, and fail safe nature is good.

Description

Secondary pump system for medium-deep geothermal source heat pump

Technical Field

The application relates to the technical field of geothermal heat, in particular to a secondary pump system for a middle-deep geothermal source heat pump.

Background

At present, in the prior art, the pipeline lift of a middle-deep layer (2000-3000 meters) is large, so that the water flow is limited due to large power consumption of a water pump; however, the evaporator of the heat pump unit needs proper water flow to ensure the enhanced heat exchange effect; namely, the heat taking characteristics of the geothermal well at the middle and deep layers are as follows: large temperature difference, small flow and large lift; the evaporator of the conventional heat pump unit has the following heat taking characteristics: small temperature difference, large flow and small lift; the two cannot match. When the partial load operation, because the coupling relation of middle and deep geothermal well discharge and the discharge of heat pump set, the two bind each other, lead to the unable operation of falling the frenquency of geothermal well water pump of large-lift for the water pump can't be energy-conserving, because discharge is not enough, can arouse the heat transfer of heat pump set's evaporimeter to worsen, and then increase compressor power consumption, lead to when the partial load operation, the system is energy-conserving not enough. And because the outlet water temperature range of the middle-deep geothermal well is wide, when the heat pump unit operates intermittently, the water temperature is sometimes as high as 45 ℃, but due to the heat extraction characteristic of large temperature difference, the heat pump unit cannot directly supply heat to the tail end, or the heat pump unit is required to supply heat to the tail end, but the conventional heat pump unit cannot bear the high water temperature of 45 ℃ and cannot operate normally. The invention patent document with the publication number of CN107387056A and the name of 'a well body structure of a heat exchange type horizontal butt joint geothermal well' discloses a well body structure of a heat exchange type horizontal butt joint geothermal well, which comprises a vertical well and a horizontal engineering well, wherein the vertical well and the horizontal engineering well are in butt joint connection at the bottom, and the whole structure is in a U-shaped structure. The utility model patent document with publication number CN208365855U and name "a geothermal pump" discloses a geothermal pump, including: a frame; the compressor is arranged on the rack; the compressor is respectively connected with a first interface and a second interface of the four-way valve through two refrigerant conveying pipelines; one end of the first heat exchanger is connected with a third interface of the four-way valve through a refrigerant conveying pipeline, the other end of the first heat exchanger is connected with a second heat exchanger through a refrigerant conveying pipeline, and an expansion valve is arranged on the refrigerant conveying pipeline between the first heat exchanger and the second heat exchanger; the other end of the second heat exchanger is connected with a fourth interface of the four-way valve through a refrigerant conveying pipeline; the first heat exchanger and the second heat exchanger are both formed by spirally winding sleeves; the sleeve is composed of an inner pipe and an outer pipe sleeved on the outer surface of the inner pipe, wherein a first flow passage capable of allowing liquid to flow is formed between the outer surface of the inner pipe and the inner wall surface of the outer pipe; the inner part of the inner pipe forms a second flow passage. The invention patent document with publication number CN103175345A and name "heat pump unit" discloses a heat pump unit, comprising: the first heat exchanger is arranged on the main path; the heat exchange compression assemblies are arranged on the same branch line; each heat exchange compression assembly comprises a second heat exchanger, a compressor and a four-way valve, the second heat exchanger is arranged between the first heat exchanger and a first interface of the four-way valve, two ends of the compressor are connected with a second interface and a third interface of the four-way valve, and a fourth interface of the four-way valve is connected with the first heat exchanger. The utility model patent document with the publication number of CN204345975U and the name of 'a dry evaporator with heater' discloses a geothermal constant temperature dry evaporator, which comprises a shell, a tube plate, an evaporation tube, an end cover, a liquid inlet tube, a distribution plate, a distribution tube, a through hole and a pump, wherein the tube plate is respectively arranged at two ends of the shell; the tube plates are connected with the evaporation tubes; the end covers are arranged at two ends of the shell; the end cover is connected with the liquid inlet pipe; the end cover at one end corresponding to the liquid inlet pipe is internally provided with the distribution plate; the distribution plate is radially provided with the through hole; the through holes are correspondingly connected with the distribution pipes; the distribution pipe corresponds to the evaporation pipe and is connected with the inside of the evaporation pipe in an extending mode. The utility model patent document with the publication number of CN207556021U and the name of 'middle-deep geothermal source heat pump' discloses a middle-deep geothermal source heat pump system, which comprises a middle-deep geothermal well heat exchanger, a ground source side circulating pump and a high-temperature heat source type water source heat pump host; the heat exchanger in the geothermal well of the middle deep layer is arranged in a drilled hole of a rock-soil layer; the heat exchanger in the middle-deep geothermal well comprises an outer sleeve and an inner sleeve; the bottom end and the side wall of the outer sleeve are closed; the inner sleeve is arranged in the outer sleeve, and an opening at the bottom end of the inner sleeve is communicated with the bottom of the outer sleeve; the upper port of the outer sleeve is communicated with a circulating medium inflow pipeline; the upper port of the inner sleeve is communicated with a circulating medium outflow pipeline; the other end of the circulating medium inflow pipeline and the other end of the circulating medium outflow pipeline are communicated through an evaporator side in the high-temperature heat source type water source heat pump host; the ground source side circulating pump is arranged on the circulating medium inflow pipeline and used for driving the circulating medium to flow downwards along a gap between the inner wall of the outer sleeve and the outer wall of the inner sleeve of the heat exchanger in the middle-deep geothermal well. The pump system for the mid-deep geothermal source heat pump in the prior art has the problems that the system is insufficient in energy saving, a conventional heat pump unit cannot bear high water temperature of 45 ℃ and cannot normally operate when partial load operation is caused due to the fact that the pump system for the mid-deep geothermal source heat pump in the prior art cannot be matched with a geothermal well pump with small temperature difference and large flow rate, the geothermal well pump with large lift cannot be operated in a frequency reduction mode, the water pump cannot save energy, heat exchange of an evaporator of the heat pump unit is deteriorated, power consumption of.

SUMMERY OF THE UTILITY MODEL

The application provides a secondary pump system for middle and deep geothermal source heat pump, secondary pump system for middle and deep geothermal source heat pump includes middle and deep geothermal well, primary pump, A heat pump set and B heat pump set, its characterized in that, middle and deep geothermal well, primary pump, A heat pump set's evaporimeter and B heat pump set's evaporimeter loop through pipeline series connection and become closed circuit, and A heat pump set and B heat pump set pass through the pipeline respectively with a secondary pump and constitute parallel structure.

According to the secondary pump system for the middle-deep geothermal source heat pump, the evaporators of the A heat pump unit and the B heat pump unit are connected in series, so that large temperature difference utilization of the middle-deep geothermal well is realized; when the water flow of the primary pump is insufficient, the secondary pump respectively provides enough water flow for the evaporators of the heat pump unit A and the heat pump unit B so as to ensure the enhanced heat exchange; when the outlet water temperature of the middle-deep geothermal well is too high, certain cold and hot water temperature balance is carried out through a secondary pump, and the water enters evaporators of the A heat pump unit and the B heat pump unit at proper water temperature.

Further, in order to solve the problem that outlet channel installation, maintenance and change are inconvenient among the prior art, the secondary pump system for the ground heat pump of middle and deep layer of this application can also be, inlet channel's inner wall constitutes spaced wall's structure, and the spaced wall is connected with inlet channel's outer wall through connection structure for inlet channel and outlet channel are convenient for install, and conveniently maintain and change outlet channel, optimize and strengthen the structure of middle and deep layer ground heat well.

The secondary pump system for the middle-deep geothermal source heat pump can achieve the following beneficial effects:

the secondary pump system for the middle-deep geothermal source heat pump solves the problems that in the prior art, the middle-deep geothermal source heat pump in the background art has small temperature difference, large flow and small lift, the middle-deep geothermal source heat pump and the deep geothermal source heat pump cannot be matched, a large-lift geothermal well water pump cannot operate in a frequency reduction mode, the water pump cannot save energy, heat exchange of an evaporator of a heat pump unit is deteriorated, power consumption of a compressor is increased, and when the system operates at partial load, the system is insufficient in energy saving, a conventional heat pump unit cannot bear high water temperature of 45 ℃ and cannot operate normally; the system can solve the puzzlement problem of system efficiency and high temperature heat source utilization, realizes the decoupling of the middle and deep geothermal well and the heat pump unit, achieves the purpose of system energy saving, is suitable for high temperature heat sources, and has good safety and reliability.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

fig. 1 is a schematic structural diagram of a secondary pump system for a mid-deep ground heat source heat pump according to the present application.

Fig. 2 is a top view of a middle-deep geothermal well of the secondary pump system for a middle-deep geothermal source heat pump of the present application.

Fig. 3 is a schematic view of a connection structure of a connection rod of a secondary pump system for a mid-deep geothermal source heat pump according to the present application.

Fig. 4 is a top view of a connection structure of an inner annular plate of a connection rod of a secondary pump system for a mid-deep ground heat source heat pump according to the present application.

Fig. 5 is a front view of a connection structure of an inner annular plate of a connection rod of a secondary pump system for a mid-deep ground heat source heat pump according to the present application.

Fig. 6 is a top view of a connection structure of overlapping rods of a connection rod of a secondary pump system for a mid-deep ground heat source heat pump according to the present application.

Fig. 7 is a front view of a connection structure of overlapping rods of a connection rod of a secondary pump system for a mid-deep ground heat source heat pump according to the present application.

In the figure, 1 is a middle-deep geothermal well, 101 is an inlet channel, 102 is an outlet channel, and 103 is a partition wall; 2 is a primary pump, 3 is an A heat pump unit, 4 is a B heat pump unit, and 5 is a secondary pump; 6 is a connecting rod, 7 is an outer supporting ring, 701 is a supporting groove, 8 is an inner annular plate, 801 is an overlapping convex column, 9 is an overlapping rod, and 10 is a through hole.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.

Example 1

The utility model provides a secondary pump system for middle and deep ground heat source heat pump, refer to fig. 1, secondary pump system for middle and deep ground heat source heat pump includes middle and deep geothermal well 1, primary pump 2, A heat pump set 3 and B heat pump set 4, its characterized in that, middle and deep geothermal well 1, primary pump 2, the evaporimeter of A heat pump set 3 and the evaporimeter of B heat pump set 4 loop through pipeline series connection and become closed loop, and A heat pump set 3 and B heat pump set 4 constitute parallel structure through the pipeline with a secondary pump 5 respectively.

In the secondary pump system for the medium-deep geothermal source heat pump of the embodiment, the evaporators of the A heat pump unit 3 and the B heat pump unit 4 are connected in series, so that large temperature difference utilization of the medium-deep geothermal well 1 is realized; when the water flow of the primary pump 2 is insufficient, the secondary pump 5 provides sufficient water flow for the evaporators of the A heat pump unit 3 and the B heat pump unit 4 respectively so as to ensure the enhanced heat exchange; when the outlet water temperature of the middle-deep geothermal well 1 is overhigh, certain cold and hot water temperature balance is carried out through a secondary pump 5, and the water enters evaporators of an A heat pump unit 3 and a B heat pump unit 4 at proper water temperature; the secondary pump system is adopted, so that water flow in the middle-deep geothermal well 1 is decoupled from water flow of the A heat pump unit 3 and the B heat pump unit 4, the primary pump 2 of the deep geothermal well 1 adopts large temperature difference, small flow and large lift, and the secondary pumps 5 of evaporators of the A heat pump unit 3 and the B heat pump unit 4 adopt small temperature difference, large flow and small lift, so that the system has obvious energy-saving effect when the system operates under variable working conditions. The system adopts a secondary pump 5 system, so that when the water outlet temperature of the middle-deep geothermal well 1 is up to 45 ℃, the A heat pump unit 3 and the B heat pump unit 4 can also normally operate. The dashed arrows in fig. 1 indicate the heat exchange direction.

It should be noted that the intermediate-depth geothermal well 1 may be provided with an inlet channel 101 and an outlet channel 102 to ensure the heat exchange operation. The inlet channel 101 may be a vertical tubular shape to facilitate the setting of the inlet channel 101, and the outlet channel 102 may also be a vertical tubular shape to facilitate the setting of the outlet channel 102, and to facilitate the heat exchange through the structural cooperation of the inlet channel 101 and the outlet channel 102. The longitudinal central axis of the inlet channel 101 may be parallel to the longitudinal central axis of the outlet channel 102 to promote a heat exchange structure, ensuring heat exchange efficiency.

Example 2

Referring to fig. 2, in the secondary pump system for a heat pump of a medium-deep ground heat source of the present embodiment, further, the tubular structure of the inlet channel 101 is sleeved outside the tubular structure of the outlet channel 102, so as to optimize the heat exchange structure and reduce the volume of the equipment. The longitudinal central axis of the inlet channel 101 may coincide with the longitudinal central axis of the outlet channel 102, resulting in good symmetry of the device and improved stability and safety. The inner wall of the inlet channel 101 coincides with the outer wall of the outlet channel 102, i.e. the inlet channel 101 is tubular, the outlet channel 102 is annular tubular, and the inner wall of the inlet channel 101 is the outer wall of the outlet channel 102. And the inlet channel 101 may be a circular tube and the outlet channel 102 may be a circular ring tube. The inner wall of the inlet channel 101, i.e. the outer wall of the outlet channel 102, forms the structure of the partition wall 103, the inlet channel 101 communicates with the lower end of the outlet channel 102, and in practical applications, the partition wall 103 can be connected with the outer wall of the inlet channel 101, i.e. the inner wall of the geothermal well 1 in the middle deep layer, through a connecting structure, see fig. 3, which can be a transverse connecting rod 6, i.e. the two ends of the connecting rod 6 are respectively connected with the outer wall of the inlet channel 101 and the partition wall 103 through welding or bolts. The number of the connecting rods 6 can be at least two, and the connecting rods are uniformly distributed, so that the safety and the stability of the connecting structure are improved. The connecting rods 6 may also be replaced by reinforcing plates. The fixing structure of the connecting rod 6 and the reinforcing plate may be a welded connection or a bolt connection. Or, the inner wall of the inlet channel 101 forms the structure of the partition wall 103, the outer wall of the inlet channel 101 is provided with a support structure, the outer side of the partition wall 103 is provided with a lap structure, the lap structure is erected on the support structure, that is, the outer wall of the inlet channel 101, that is, the inner wall of the middle-deep geothermal well 1 is provided with a support structure, the outer side of the partition wall 103 is provided with a lap structure, and the lap structure is erected on the support structure, so that the support fixation of the partition wall 103 is realized, and the partition wall 103 can be conveniently taken down for replacement or adjustment by releasing the erection connection of the lap structure lap and the support structure, wherein the support structure can be an outer annular plate 7, for example, the support structure can be a transverse outer annular plate 7 welded or screwed on the inner wall of the middle-deep geothermal well 1, and the lap structure can be a transverse inner annular plate 8 or lap bar 9 welded or screwed outside the partition wall 103, referring to fig. 4 and 5, the inner annular plate 8 or the lap bar 9 is lapped on the outer annular plate 7 to support the partition wall 103. The number of the lapping rods 9 can be at least two and is evenly distributed. One or both of the outer annular plate 7 and the inner annular plate 8 are provided with through holes 10, and the number of the through holes 10 can be at least two and is uniformly distributed. Referring to fig. 6 and 7, a support groove 701 may be provided on the upper surface of the outer ring plate 7 at the overlapping rod 9, and the overlapping rod 9 may be provided in the support groove 701 to improve the firm stability of the engagement of the overlapping structure and the support structure. In addition, the lower surface of the inner annular plate 8 may also be provided with an overlapping protrusion column 801 matched with the supporting groove 701, and the overlapping protrusion column 801 is disposed in the supporting groove 701 to improve the firm stability of the matching of the overlapping structure and the supporting structure. Wherein, the supporting groove 701 may be configured as a circular groove or a rectangular groove according to the structure of the overlapping rod 9 or the overlapping protrusion column 801. The respective connecting structures of the bridging structure and the supporting structure may also be welded structures or bolted connections.

The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A secondary pump system for a middle-deep geothermal source heat pump comprises a middle-deep geothermal well (1), a primary pump (2), an A heat pump unit (3) and a B heat pump unit (4), and is characterized in that the middle-deep geothermal well (1), the primary pump (2), an evaporator of the A heat pump unit (3) and an evaporator of the B heat pump unit (4) are sequentially connected in series through pipelines to form a closed loop, and the A heat pump unit (3) and the B heat pump unit (4) respectively form a parallel structure with a secondary pump (5) through pipelines; an inlet channel (101) and an outlet channel (102) are arranged in the middle-deep geothermal well (1); the tubular structure of the inlet channel (101) is sleeved outside the tubular structure of the outlet channel (102), the inlet channel (101) is tubular, and the outlet channel (102) is annular tubular; the inner wall of the inlet channel (101) coincides with the outer wall of the outlet channel (102); the inner wall of the inlet channel (101) forms a structure of a partition wall (103), the partition wall (103) is connected with the outer wall of the inlet channel (101) through a connecting structure, the connecting structure is a transverse connecting rod (6) or a reinforcing plate, and two ends of the connecting rod (6) or the reinforcing plate are respectively connected with the outer wall of the inlet channel (101) and the partition wall (103) through welding or bolts; a supporting structure is arranged on the outer wall of the inlet channel (101), and an overlapping structure is arranged on the outer side of the partition wall (103) and is erected on the supporting structure; the supporting structure is a transverse outer annular plate (7) welded or screwed on the inner wall of the middle-deep geothermal well (1), the connecting structure is connected with a transverse inner annular plate (8) or a connecting rod (9) outside the partition wall (103) through welding or screws, and the inner annular plate (8) or the connecting rod (9) is arranged on the outer annular plate (7) in a bridging mode to support the partition wall (103).

2. The secondary pump system for a heat pump of mid-deep ground heat source according to claim 1, characterized in that the inlet channel (101) is vertically tubular.

3. The secondary pump system for a heat pump for medium and deep ground heat sources according to claim 2, characterized in that the outlet channel (102) is vertically tubular.

4. The secondary pump system for a heat pump of medium-deep heat source according to claim 3, characterized in that the longitudinal central axis of the inlet channel (101) is parallel to the longitudinal central axis of the outlet channel (102).

5. The secondary pump system for a heat pump of medium-deep heat source according to claim 1, characterized in that the longitudinal central axis of the inlet channel (101) coincides with the longitudinal central axis of the outlet channel (102).