Different-stroke type buried pipe loop hydraulic balance structure applied to single well control

Abstract

The utility model discloses a different-stroke type buried pipe loop hydraulic balance structure applied to single well control, which comprises at least one buried pipe group, and the buried pipe group comprises a water segregator, a water collector and a plurality of buried pipes; each buried pipe is correspondingly buried in a pipe well, the pipe wells are arranged in an isosceles right triangle shape, the water segregator and the water collector are arranged at the midpoint of the hypotenuse of the isosceles right triangle, the pipe wells are symmetrically arranged in the isosceles right triangle with the perpendicular bisector of the isosceles right triangle as the boundary, and the closer the buried pipes are to the water segregator and the water collector. And the buried depth is deeper. On the premise that the number of the buried pipes is not changed, hydraulic balance of a system meets requirements, energy consumption of a water pump is reduced, and operation cost of the system is reduced by changing the division mode of the buried pipe group, changing the pipeline arrangement mode of the horizontal connecting pipes and adjusting the buried depth of the vertical buried pipes; meanwhile, the number of sub-catchers is reduced, and initial investment is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of underground pipe heat exchange systems, in particular to a hydraulic balance structure of an out-of-phase underground pipe loop applied to single well control. Background Art

[0002] At present, most underground pipe heat exchange systems adopt single-well independent control. Compared with multi-well control, this method reduces the number of connections of horizontal connecting pipes, which can effectively reduce the risk of system damage and maintenance costs. At the same time, when a certain underground pipe system loop is damaged, the multi-well control system needs to shut down all the underground pipes in this subsystem, which has a greater impact on the heat output of the underground pipe system, while the single-well independent control system only needs to shut down a single underground pipe loop, which has less impact on the heat output of the underground pipe system.

[0003] The loop layout of the buried pipe heat exchange system is usually the same program and different program. The same program single-well controlled buried pipe heat exchange system is easy to achieve hydraulic balance, but the system has long pipelines, increased pipe consumption, increased initial investment, and large system resistance, increased water pump energy consumption, and increased operating costs. Although the different program single-well controlled buried pipe heat exchange system has low pipe consumption and low initial investment, how to arrange more buried pipe heat exchangers in the buried pipe heat exchange system while ensuring hydraulic balance has become a difficult problem for the different program buried pipe heat exchange system. Therefore, there is an urgent need for a single-well controlled different program buried pipe loop hydraulic balance structure. Utility Model Content

[0004] In view of the shortcomings existing in the above problems, the utility model provides a hydraulic balance structure of a different-programmed underground pipe loop applied to single well control.

[0005] To achieve the above-mentioned object, the utility model provides a hydraulic balance structure of a different-programmed underground pipe loop for single-well control, comprising at least one underground pipe group, wherein the underground pipe group comprises a water distributor, a water collector and a plurality of underground pipes, each of the underground pipes is correspondingly buried in a pipe well and each of the underground pipes is respectively connected to the water distributor and the water collector;

[0006] Among them, the pipe wells are arranged in an isosceles right triangle, the water distributor and the water collector are arranged at the midpoint of the hypotenuse of the isosceles right triangle, and the pipe wells are symmetrically arranged in the isosceles right triangle with the perpendicular bisector of the isosceles right triangle as the boundary, and the closer the distance between the buried pipe and the water distributor and the water collector, the deeper its buried depth.

[0007] Preferably, the buried pipe is buried in the pipe well in a U shape, and one end of the buried pipe is connected to the water distributor through a water supply pipeline, and the other end is connected to the water collector through a return pipeline.

[0008] Preferably, the water supply pipeline, the return pipeline and the buried pipe form a loop pipe section, and the loop pipe section includes a horizontal pipeline and a vertical pipeline.

[0009] Preferably, the horizontal pipeline adopts a heterogeneous pipeline network layout.

[0010] Preferably, the calculation of the buried depth of each buried pipe includes:

[0011] Setting the buried depth of the buried pipe at the farthest end, and calculating the resistance of the loop pipe section of the buried pipe at the farthest end;

[0012] Based on the fact that the resistance of each loop pipeline is the same, the horizontal pipeline length of each loop pipeline is determined to obtain the buried depth of each buried pipe.

[0013] Preferably, the resistance calculation formula of the loop pipe section is:

[0014] P=P1+P2=R1×L1+2×R2×h;

[0015] In the formula: P is the resistance of the loop pipe section; P1 is the resistance of the horizontal pipeline in the loop pipe section; P2 is the resistance of the vertical pipeline in the loop pipe section; R1 is the specific friction resistance of the horizontal pipeline in the loop pipe section; L is the pipeline length of the horizontal pipeline in the loop pipe section; R2 is the specific friction resistance of the vertical pipeline in the loop pipe section; h is the pipeline length of the vertical pipeline in the loop pipe section.

[0016] Preferably, the sum of the buried depths of all the buried pipes is compared with the sum of the buried pipe lengths calculated based on the heat exchange per meter. If the difference is greater than a set threshold, the buried depth of the farthest buried pipe is reselected for calculation.

[0017] Preferably, the sum of the lengths of the buried pipes calculated based on the heat exchange rate per meter is calculated as follows:

[0018] Q = q × L;

[0019] Wherein: Q is the heat rejection of the buried pipe group load; q is the heat exchange per meter of the buried pipe group; and L is the sum of the lengths of all the buried pipes.

[0020] The present application also provides a method for arranging a hydraulic balance structure of an underground pipe loop, comprising:

[0021] Determine the heat rejection and heat exchange per meter of the underground pipe group load, and obtain the sum of the lengths of all underground pipes;

[0022] Based on the sum of the lengths of all the buried pipes, an average depth of the pipe wells in which the buried pipes are buried is set to obtain the number of the pipe wells;

[0023] Based on the number of the tube wells, the tube wells are arranged in an isosceles right triangle;

[0024] The water collector and the water distributor are arranged at the midpoint of the hypotenuse of the isosceles right triangle, one end of each of the underground pipes is connected to the water distributor through a water supply pipeline, and the other end is connected to the water collector through a return pipeline, and the water supply pipeline, the return pipeline and the underground pipe form a loop pipe section, wherein the horizontal pipes of the loop pipe section in each of the underground pipes are connected in the form of a heterogeneous pipe network layout, and the length of the horizontal pipe in the loop pipe section corresponding to each of the underground pipes is measured;

[0025] Setting the depth of the farthest pipe well and calculating the resistance of the loop pipe section of the farthest pipe well;

[0026] Based on the fact that the resistance of each of the loop pipelines is the same, the length of the horizontal pipeline in each of the loop pipelines is determined to obtain the buried depth of each of the buried pipes.

[0027] Compared with the prior art, the beneficial effects of the utility model are:

[0028] Under the premise of ensuring that the number of buried pipes remains unchanged, the utility model changes the division method of the buried pipe group, changes the pipeline layout method of the horizontal connecting pipe, and adjusts the buried depth of the vertical buried pipe, so that the system hydraulic balance meets the requirements, the energy consumption of the water pump is reduced, and the system operation cost is reduced; at the same time, the number of manifolds is reduced, and the initial investment is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a structural diagram of the hydraulic balance structure of the different-programmed underground pipe loop used for single well control of the utility model;

[0030] Figure 2 The utility model is a layout diagram of a hydraulic balance structure of a different-programmed underground pipe loop for single-well control. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0033] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] The following is combined with Figure 1 The utility model is further described in detail:

[0035] In the application, since the water distributor and the water collector are set together and the two are integrated, in order to show it more clearly, Figure 1 The water distributor and water collector are integrated into one, indicating 1.

[0036] like Figure 1 As shown, the utility model provides a hydraulic balance structure of a different-programmed underground pipe loop for single well control, comprising at least one underground pipe group, the underground pipe group comprising a water distributor, a water collector and a plurality of underground pipes 3, each of the underground pipes 3 is correspondingly buried in a pipe well and each of the underground pipes is respectively connected to the water distributor and the water collector;

[0037] Among them, the pipe wells are arranged in an isosceles right triangle 2, the water distributor and the water collector are located at the midpoint of the hypotenuse of the isosceles right triangle 2, and the pipe wells are symmetrically arranged in the isosceles right triangle 2 with the perpendicular bisector of the isosceles right triangle 2 as the boundary, and the closer the distance between the buried pipe 3 and the water distributor and the water collector, the deeper its buried depth.

[0038] In this embodiment, the underground pipe 3 is buried in the pipe well in a U-shape, and one end of the underground pipe 3 is connected to the water distributor through the water supply pipe 4, and the other end is connected to the water collector through the return pipe 5. The underground pipe 3, the water supply pipe 4 and the return pipe 5 form a loop pipe section, which includes horizontal pipes and vertical pipes. The horizontal pipe adopts a different-program pipe network layout, such as Figure 1 The connection arrangement of the buried pipes at A, B and C.

[0039] Specifically, there is a pipe well at the corresponding position of the two right-angled sides of each isosceles right triangle 2, so that the lengths of the horizontal connecting pipes from the two buried pipes to the manifold are the same, and the resistance of the loop pipe section is basically the same. When the buried pipe group meets the hydraulic balance requirements, the number of buried pipes in each buried pipe group is the largest. For the entire pipe group, the number of manifolds is reduced, saving investment. The existing single-well controlled asymmetric buried pipe heat exchange system is arranged in a rectangular shape with the buried pipe group, the water divider and the water collector located on one side of the rectangle and the buried depth of each buried pipe in the buried pipe group being equal. This results in different resistances of the loop pipe sections of the buried pipes on both sides of the water divider and the water collector, and hydraulic balance is not easy to achieve. However, the depth of the vertical buried pipes near the water divider and the water collector of the present application is deeper than that of the vertical buried pipes of the conventional buried pipe heat exchange system, and the buried depth of the vertical buried pipes at the far end is shallower. The resistance of each loop is adjusted by trial calculation, and finally the hydraulic balance of the entire buried pipe heat exchange system meets the requirements.

[0040] In this embodiment, the calculation of the buried depth of each buried pipe 3 includes:

[0041] Setting the depth of the farthest buried pipe 3 and calculating the resistance of the loop pipe section of the farthest buried pipe 3;

[0042] Based on the fact that the resistance of each loop pipeline is the same, the horizontal pipeline length of each loop pipeline is determined to obtain the buried depth of each buried pipe 3 .

[0043] Furthermore, the resistance calculation formula of the loop pipe section is:

[0044] P=P1+P2=R1×L1+2×R2×h;

[0045] Where: P is the resistance of the loop pipe section; P1 is the resistance of the horizontal pipeline in the loop pipe section; P2 is the resistance of the vertical pipeline in the loop pipe section; R1 is the specific friction resistance of the horizontal pipeline in the loop pipe section; L is the pipeline length of the horizontal pipeline in the loop pipe section; R2 is the specific friction resistance of the vertical pipeline in the loop pipe section; h is the pipeline length of the vertical pipeline in the loop pipe section.

[0046] In this embodiment, the calculated buried depths of all buried pipes 3 are compared with the sum of the lengths of the buried pipes 3 calculated based on the heat exchange per meter. If the difference is greater than a set threshold, the buried depth of the farthest buried pipe 3 is reselected for calculation.

[0047] Specifically, the sum of the lengths of the buried pipes 3 calculated based on the heat exchange per meter is calculated as follows:

[0048] Q = q × L;

[0049] Where: Q is the heat rejection of the underground pipe group load; q is the heat exchange per meter of the underground pipe group; L is the sum of the lengths of all underground pipes 3.

[0050] In this embodiment, during the actual arrangement process, the resistance of the loop pipe section in each buried pipe 3 cannot be completely equal, so in order to ensure the optimal solution, an unbalance rate threshold is set, and the unbalance rate is the resistance difference between any two loop pipe sections divided by the larger value of the resistance of the two loop pipe sections. If the unbalance rate obtained by calculation is compared with the unbalance rate threshold, and if it is greater than the unbalance rate threshold, it is also necessary to reselect the burial depth of the farthest buried pipe 3. The present application obtains the optimal solution while satisfying the total length of the buried pipe 3 and ensuring the unbalance rate.

[0051] Take a geothermal project as an example. The project has 310 underground pipe wells. According to the conventional rectangular well group division method and the same program pipe network layout, the most unfavorable loop resistance of the pipeline is about 9m. According to the calculation of this application, the resistance of each loop is basically maintained at about 7.5m. The conventional design water pump head is about 35m, and the water pump head is reduced by about 4.28%.

[0052] The present application also provides a method for arranging a hydraulic balance structure of an underground pipe loop, comprising:

[0053] Determine the heat rejection and heat exchange per meter of the underground pipe group load, and obtain the sum of the lengths of all underground pipes 3;

[0054] Based on the sum of the lengths of all the underground pipes 3, the average depth of the pipe wells where the underground pipes 3 are buried is set to obtain the number of pipe wells;

[0055] Based on the number of pipe wells, the buried pipe group is arranged in an isosceles right triangle;

[0056] The water collector and the water distributor are arranged at the midpoint of the hypotenuse of the isosceles right triangle. One end of each buried pipe 3 is connected to the water distributor through a water supply pipeline, and the other end is connected to the water collector through a return pipeline. The water supply pipeline, the return pipeline and the buried pipe 3 form a loop pipe section, wherein the horizontal pipes of the loop pipe section in each buried pipe 3 are connected in the form of a different-programmed pipe network layout, and the length of the horizontal pipe in the loop pipe section corresponding to each buried pipe is measured;

[0057] Set the depth of the farthest pipe well and calculate the resistance of the loop pipe section of the farthest pipe well;

[0058] Based on the fact that the resistance of each loop pipeline is the same, the length of the horizontal pipeline in each loop pipeline is determined to obtain the buried depth of each buried pipe 3 .

[0059] In this embodiment, the sum of the lengths of all the underground pipes 3 is divided by the average depth of the underground pipe wells where the underground pipes 3 are buried to obtain the number of pipe wells. If it is not an integer, a larger integer is taken. According to the shape of the area (length-to-width ratio), an isosceles right triangle well group (length-to-width ratio 2:1) is arranged from the middle and extends to both sides, as follows: Figure 2 Of course, if the number is not enough to arrange the well group into an isosceles right triangle, the corresponding number will be supplemented. In addition, the average depth of the pipe well and the depth of the farthest pipe well are set based on the geomorphic location and hydrogeological conditions and combined with the working pressure.

[0060] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A hydraulic balance structure of a different-programmed underground pipe loop for single well control, characterized in that: The invention comprises at least one underground pipe group, wherein the underground pipe group comprises a water distributor, a water collector and a plurality of underground pipes, each of the underground pipes is correspondingly buried in a pipe well and each of the underground pipes is respectively connected to the water distributor and the water collector; Among them, the pipe wells are arranged in an isosceles right triangle, the water distributor and the water collector are arranged at the midpoint of the hypotenuse of the isosceles right triangle, and the pipe wells are symmetrically arranged in the isosceles right triangle with the perpendicular bisector of the isosceles right triangle as the boundary, and the closer the distance between the buried pipe and the water distributor and the water collector, the deeper its buried depth.

2. The hydraulic balance structure of the underground pipe loop for single well control according to claim 1 is characterized in that: The buried pipe is buried in the pipe well in a U shape, and one end of the buried pipe is connected to the water distributor through a water supply pipeline, and the other end is connected to the water collector through a return pipeline.

3. The hydraulic balance structure of the underground pipe loop for single well control according to claim 2 is characterized in that: The water supply pipeline, the return pipeline and the buried pipe form a loop pipe section, and the loop pipe section includes a horizontal pipeline and a vertical pipeline.

4. The hydraulic balance structure of the underground pipe loop for single well control according to claim 3 is characterized in that: The horizontal pipeline adopts a different-program pipe network layout.

5. The hydraulic balance structure of the underground pipe loop for single well control according to claim 4 is characterized in that: The calculation of the buried depth of each buried pipe includes: Setting the buried depth of the buried pipe at the farthest end, and calculating the resistance of the loop pipe section of the buried pipe at the farthest end; Based on the fact that the resistance of each loop pipe section is the same, the horizontal pipe length of each loop pipe section is determined to obtain the buried depth of each buried pipe.

6. The hydraulic balance structure of the underground pipe loop for single well control according to claim 5 is characterized in that: The resistance calculation formula of the loop pipe section is: P=P1+P2=R1×L1+2×R2×h; In the formula: P is the resistance of the loop pipe section; P1 is the resistance of the horizontal pipeline in the loop pipe section; P2 is the resistance of the vertical pipeline in the loop pipe section; R1 is the specific friction resistance of the horizontal pipeline in the loop pipe section; L is the pipeline length of the horizontal pipeline in the loop pipe section; R2 is the specific friction resistance of the vertical pipeline in the loop pipe section; h is the pipeline length of the vertical pipeline in the loop pipe section.

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