Natural gas pressure reduction, temperature reduction and power generation combined type energy-saving system for building

Abstract

The utility model relates to the technical field of pipeline gas transportation, in particular to the gas power generation technology, and discloses a building natural gas pressure reduction, temperature reduction and power generation combined type energy-saving system which comprises a central air-conditioning system which comprises an inner unit and an outer unit. The heat exchange system is provided with a heat exchanger, and a refrigerant pipeline is arranged in the heat exchanger; the heat exchange system is provided with at least two heat exchangers; the heat exchange system is provided with a switching valve for switching the two heat exchangers; one heat exchanger is provided with a low-temperature cold source pipeline and a refrigerant pipeline; the natural gas differential pressure power generation system is provided with a high-pressure natural gas inlet and a low-pressure natural gas outlet; the low-pressure natural gas outlet is connected to a low-pressure natural gas supply pipeline; one section of the low-pressure natural gas supply pipeline is connected into the heat exchanger to serve as a low-temperature cold source pipeline; low temperature generated in the natural gas pressure reduction process is applied to a heat exchanger to cool an air conditioner outdoor unit, and the energy utilization rate is further increased.

Description

Technical Field

[0001] The utility model relates to the technical field of pipeline gas transportation, in particular to a gas-fired power generation technology. Background Art

[0002] Natural gas is transported from high-pressure pipelines to low-pressure pipelines through multiple pressure regulation processes. Near users, pressure regulating stations further reduce the pressure to low levels for consumption. This process of pressure reduction wastes a significant amount of energy, resulting from the expansion of high-pressure natural gas into low-pressure gas.

[0003] In order to improve energy utilization and achieve the goal of energy conservation and emission reduction, it is necessary to utilize the pressure difference energy released from high-pressure natural gas to low-pressure natural gas. In addition, high-pressure natural gas will absorb a large amount of heat and generate low temperature during the expansion and pressure reduction process. This part of the cold temperature needs to be reused to improve energy utilization. Utility Model Content

[0004] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the name of the utility model of this application to avoid blurring the purpose of this section, the abstract of the specification and the name of the utility model, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] In view of the problems existing in the above-mentioned prior art, the present utility model is proposed.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] A building's natural gas decompression, cooling, and power generation combined energy-saving system, including an air-conditioning system;

[0008] The air conditioning system adopts a central air conditioning system, which includes an indoor unit and an outdoor unit;

[0009] The outdoor unit has a heat exchange system having a heat exchanger, and a refrigerant pipe is provided in the heat exchanger;

[0010] The heat exchange system has at least two heat exchangers;

[0011] The heat exchange system has a switching valve for switching between the two heat exchangers;

[0012] One of the heat exchangers has a low-temperature cold source pipe and a refrigerant pipe;

[0013] It includes a natural gas pressure difference power generation system, which is provided with a high-pressure natural gas inlet and a low-pressure natural gas outlet;

[0014] The low-pressure natural gas outlet is connected to a low-pressure natural gas supply pipeline;

[0015] A section of the low-pressure natural gas supply pipeline is connected to the heat exchanger as a low-temperature cold source pipeline.

[0016] The above design first installs two heat exchangers in the central air-conditioning system, so that different heat exchangers can be used for heating and cooling of the central air-conditioning system respectively. The heat exchanger is switched by a switching valve to improve the heat exchange efficiency of the heat exchanger, thereby improving the working efficiency of the central air-conditioning system. Then, a natural gas pressure difference power generation system is set up. When the natural gas pressure is reduced and supplied to residents, the natural gas pressure difference power generation system is used to reduce the pressure and generate electricity, thereby improving energy utilization efficiency. Finally, a section of the low-pressure natural gas supply pipeline is connected to the heat exchanger as a low-temperature cold source pipeline. The low temperature generated during the natural gas pressure reduction process is used in the heat exchanger to cool the air-conditioning outdoor unit, further improving energy utilization.

[0017] Preferably, the heat exchanger is a plate heat exchanger, which facilitates heat exchange between the refrigerant pipe and the low-temperature cold source pipe.

[0018] Preferably, the heat exchanger is provided with a fan, and the fan blows toward the low-temperature cold source pipe and the refrigerant pipe through the gaps between the plates of the plate heat exchanger; the heat exchange efficiency of the heat exchanger is improved by providing the fan.

[0019] Preferably, the low-temperature cooling source pipe is made of copper, and the refrigerant pipe is also made of copper. The low-temperature cooling source pipe and the refrigerant pipe use copper pipes to further improve the heat exchange efficiency of the heat exchanger.

[0020] Preferably, the pressure differential generator of the natural gas pressure differential power generation system adopts at least one of a turbine, a steam turbine, a screw expander or an annular channel generator; the pressure differential generator can be used to generate natural gas pressure differential power, thereby improving energy utilization.

[0021] Preferably, the natural gas pressure difference power generation system is further provided with a heat exchange pipe, which is arranged on the outside of the pressure difference generator; a flowing liquid, called heat exchange fluid, is provided in the heat exchange pipe, and the heat exchange pipe is further provided with a pump for driving the flow of the heat exchange fluid; the heat exchange pipe also passes into the heat exchanger as another low-temperature cold source pipe; the low-temperature heat exchange fluid of the pressure difference generator is taken away by providing the heat exchange pipe to prevent the continuous expansion of natural gas from causing the temperature to be too low, which would affect the mechanical properties of the pressure difference generator.

[0022] Preferably, the natural gas pressure difference power generation system is further provided with a metal heat exchange plate, and the heat exchange plate is provided with at least 4 pieces arranged outside the pressure difference generator; and a hot air blower is provided to heat the pressure difference generator; further improving the guarantee that the pressure difference generator will not be too low in temperature.

[0023] Preferably, the inlet and outlet of each heat exchanger refrigerant pipe are connected to the switching valve, and the switching valve has a state of simultaneously disconnecting the heat exchanger refrigerant pipe and a state of opening one of the two heat exchanger refrigerant pipes; the switching valve can switch to the heat exchanger with the low-temperature cold source pipe when the central air-conditioning system is cooling, and switch to the other heat exchanger (connected to the heat source pipe) when the central air-conditioning system is heating, and there is a working state of closing the two heat exchangers during the switching process, and the heat source and cold source will not conflict with each other.

[0024] Preferably, the central air-conditioning system also includes a refrigerant pipeline, and the inlet and outlet of the refrigerant pipeline are also connected to the switching valve; when the switching valve opens the refrigerant pipeline, the refrigerant pipe is connected to the refrigerant pipeline to form a circulation loop; ensuring that the central air-conditioning system can use a cooling or heating heat exchanger, improve the heat exchange efficiency of the heat exchanger, and thus improve the working efficiency of the central air-conditioning system.

[0025] Preferably, the switching valve is an electromagnetically controlled switching valve; the electromagnetically controlled switching valve can realize automatic switching between heating and cooling, thereby improving the convenience of using a central air conditioner with two heat exchangers. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without inventive work. Among them:

[0027] Figure 1 This is a schematic diagram of the overall structure of a building natural gas pressure reduction, cooling and power generation composite energy-saving system according to an embodiment of the present invention;

[0028] Figure 2 A schematic diagram of the cross-sectional structure of a switching valve of a building natural gas pressure reduction, cooling and power generation combined energy-saving system according to an embodiment of the present invention;

[0029] Figure 3 A schematic diagram of a cross-sectional structure of a switching valve closed in a building natural gas pressure reduction, cooling and power generation combined energy-saving system according to an embodiment of the present invention;

[0030] Figure 4 This is a structural schematic diagram of a natural gas pressure difference power generation system of a building natural gas pressure reduction, cooling and power generation combined energy-saving system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned objects, features and advantages of the present invention more understandable, the specific implementation methods of the present invention are described in detail below with reference to the accompanying drawings.

[0032] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0033] Next, the present invention is described in detail with reference to schematic diagrams. For ease of illustration, cross-sectional views of device structures may be partially enlarged and not to scale when describing embodiments of the present invention. Furthermore, the schematic diagrams are merely illustrative and should not limit the scope of protection of the present invention. Furthermore, in actual production, three-dimensional dimensions, including length, width, and depth, should be included.

[0034] Furthermore, the term "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in less than one implementation of the present invention. The phrase "in one embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it necessarily refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0035] Example 1

[0036] Reference Figure 1-Figure 3 , a building natural gas pressure reduction, cooling and power generation composite energy-saving system, including an air-conditioning system.

[0037] The air conditioning system adopts a central air conditioning system 1, which includes an indoor unit 11 and an outdoor unit; the outdoor unit has a heat exchange system having a heat exchanger 12, and a refrigerant pipe 14 is provided in the heat exchanger 12; the heat exchange system has at least two heat exchangers 12; the heat exchange system has a switching valve 13 for switching the two heat exchangers 12; one of the heat exchangers 12 has a low-temperature cold source pipe and a refrigerant pipe 14; it includes a natural gas pressure difference power generation system 2, which is provided with a high-pressure natural gas inlet and a low-pressure natural gas outlet; the low-pressure natural gas outlet is connected to a low-pressure natural gas supply pipe; a section of the low-pressure natural gas supply pipe is connected to the heat exchanger 12 as a low-temperature cold source pipe, first through the central The central air-conditioning system 1 is provided with two heat exchangers 12, so that different heat exchangers 12 can be used for heating and cooling of the central air-conditioning system 1 respectively, and the switching valve 13 is used to switch the selection of the heat exchanger 12, thereby improving the heat exchange efficiency of the heat exchanger 12, thereby improving the working efficiency of the central air-conditioning system 1; then, a natural gas pressure difference power generation system 2 is provided, and when the natural gas is depressurized and supplied to residents, the natural gas pressure difference power generation system 2 is used to reduce the pressure and generate electricity, thereby improving energy utilization efficiency; finally, a section of the low-pressure natural gas supply pipeline is connected to the heat exchanger 12 as a low-temperature cold source pipeline, and the low temperature generated during the natural gas depressurization process is applied to the heat exchanger 12 to cool the air-conditioning outdoor unit, thereby further improving energy utilization efficiency.

[0038] The heat exchanger 12 is a plate-type heat exchanger 12 , which facilitates heat exchange between the refrigerant pipe 14 and the low-temperature cold source pipe.

[0039] The heat exchanger 12 is provided with a fan, which blows air toward the low-temperature cold source pipe and the refrigerant pipe through the gaps between the plates of the plate heat exchanger 12; the heat exchange efficiency of the heat exchanger 12 is improved by providing the fan.

[0040] The low-temperature cooling source pipe is made of copper, and the refrigerant pipe 14 is also made of copper. The low-temperature cooling source pipe and the refrigerant pipe 14 use copper pipes to further improve the heat exchange efficiency of the heat exchanger 12.

[0041] The pressure difference generator 21 of the natural gas pressure difference power generation system 2 adopts at least one of a turbine, a steam turbine, a screw expander or an annular channel generator; the pressure difference generator 21 can be used to generate natural gas pressure difference, thereby improving energy utilization.

[0042] The inlet and outlet of the refrigerant pipe 14 of each heat exchanger 12 are connected to the switching valve 13, and the switching valve 13 has a state of simultaneously disconnecting the refrigerant pipe 14 of the heat exchanger 12, and a state of opening one of the two refrigerant pipes 14 of the heat exchanger 12; the switching valve 13 can switch to the heat exchanger 12 with the low-temperature cold source pipe when the central air-conditioning system 1 is cooling, and switch to the other heat exchanger 12 (which can be connected to the heat source pipe) when the central air-conditioning system 1 is heating, and during the switching process, the working states of the two heat exchangers 12 are closed, and the heat source and cold source will not conflict with each other.

[0043] The central air-conditioning system 1 also includes a refrigerant pipeline 14, the inlet and outlet of which are also connected to the switching valve 13; when the switching valve 13 opens the refrigerant pipeline 14, the refrigerant pipe 14 is connected to the refrigerant pipeline 14 to form a circulation loop; ensuring that the central air-conditioning system 1 can use a cooling or heating heat exchanger 12, thereby improving the heat exchange efficiency of the heat exchanger 12, thereby improving the working efficiency of the central air-conditioning system 1.

[0044] The switching valve 13 is an electromagnetically controlled switching valve 13 ; the electromagnetically controlled switching valve 13 can realize automatic switching between heating and cooling, thereby improving the convenience of using the central air conditioner with two heat exchangers 12 .

[0045] During use, during the operation of the central air-conditioning system 1, the central air-conditioning system 1 is cooling, and the switching valve 13 can switch to the heat exchanger 12 having a low-temperature cold source pipeline. The refrigerant pipeline 14 is connected to the refrigerant pipeline 14 to form a circulation loop. The natural gas pressure difference power generation system 2 absorbs a large amount of heat and causes low temperature during the diffusion and pressure reduction process of natural gas, and a section of the low-pressure natural gas supply pipeline is connected to the heat exchanger 12 as a low-temperature cold source pipeline, so that it can not only generate electricity by using the natural gas pressure difference, but also utilize the low temperature during the expansion and pressure reduction process of natural gas, thereby greatly improving energy utilization; when the central air-conditioning system 1 is cooling or heating, the switching valve 13 switches to another heat exchanger 12 (connected to the heat source pipeline); thereby ensuring that the efficiency of the central air-conditioning system 1 is improved and energy is saved.

[0046] Example 2

[0047] Reference Figure 1 and Figure 4 , which is the second embodiment of the present utility model, and this embodiment is based on the previous embodiment.

[0048] The natural gas pressure difference power generation system 2 is also provided with a heat exchange pipe 22, which is arranged on the outside of the pressure difference generator 21; a flowing liquid, called heat exchange fluid, is provided in the heat exchange pipe 22, and the heat exchange pipe 22 is also provided with a pump 23 for driving the flow of the heat exchange fluid; the heat exchange pipe 22 also passes into the heat exchanger 12 as another low-temperature cold source pipe; by providing the heat exchange pipe 22, the low-temperature heat exchange fluid of the pressure difference generator 21 is taken away to prevent the continuous expansion of natural gas from causing the temperature to be too low, which would affect the mechanical properties of the pressure difference generator 21.

[0049] The natural gas pressure difference power generation system 2 is also provided with a metal heat exchange plate, and the heat exchange plate is provided with at least 4 pieces arranged outside the pressure difference generator 21; and a hot air blower is provided to heat the pressure difference generator 21; further improving and ensuring that the pressure difference generator 21 will not be too low in temperature.

[0050] During use, during the operation of the natural gas pressure difference working system, the heat exchange liquid in the heat exchange pipe 22 continues to flow under the drive of the pump 23, taking away the cold air of the pressure difference generator 21, preventing the temperature of the pressure difference generator 21 from being too low, and the heating fan and heat exchange plate enhance the heat exchange effect, further improving the guarantee that the pressure difference generator 21 will not be too low in temperature, affecting the mechanical properties of the pressure difference generator 21.

[0051] It is important to note that the configuration and arrangement of the present application, as illustrated in various exemplary embodiments, are illustrative only. Although only a few embodiments are described in detail in this disclosure, those reading this disclosure should readily appreciate that numerous modifications are possible without materially departing from the novel aspects and advantages of the subject matter described herein. For example, variations in the size, dimensions, structure, shape, and proportions of various components, as well as parameter values such as temperature, pressure, mounting arrangements, use of materials, color, and orientation are possible. For example, components shown as integrally formed may be constructed from multiple parts or components, the positions of components may be inverted or otherwise altered, and the nature, number, or position of discrete components may be modified or changed. Therefore, all such modifications are intended to be encompassed within the scope of this disclosure. The order or sequence of any process or method steps may be altered or reordered according to alternative embodiments. In the claims, any "means-plus-function" clause is intended to cover structures that perform the functions described herein, and not only structural equivalence but also structural equivalents. Other substitutions, modifications, changes, and omissions may be made in the design, operating conditions, and arrangement of the exemplary embodiments without departing from the scope of this disclosure. Therefore, the invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0052] Additionally, in order to provide a concise description of the exemplary embodiments, all features of the actual embodiment may not be described, ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention.

[0053] It should be understood that in the development of any actual embodiment, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but for those of ordinary skill having the benefit of this disclosure, the development effort will be a routine task of design, fabrication, and production without undue experimentation.

[0054] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, and all of these should be included in the scope of the claims of the present invention.

Claims

1. A combined energy-saving system for natural gas decompression, cooling, and power generation in a building, including an air conditioning system, characterized by: The air conditioning system adopts a central air conditioning system, which includes an indoor unit and an outdoor unit; The outdoor unit has a heat exchange system having a heat exchanger, and a refrigerant pipe is provided in the heat exchanger; The heat exchange system has at least two heat exchangers; The heat exchange system has a switching valve for switching between the two heat exchangers; One of the heat exchangers has a low-temperature cold source pipe and a refrigerant pipe; It includes a natural gas pressure difference power generation system, which is provided with a high-pressure natural gas inlet and a low-pressure natural gas outlet; The low-pressure natural gas outlet is connected to a low-pressure natural gas supply pipeline; A section of the low-pressure natural gas supply pipeline is connected to the heat exchanger as a low-temperature cold source pipeline.

2. The building natural gas decompression, cooling and power generation combined energy-saving system according to claim 1, characterized in that: The heat exchanger adopts plate heat exchanger.

3. The building natural gas decompression, cooling and power generation combined energy-saving system according to claim 2, characterized in that: The heat exchanger is provided with a fan, and the fan blows toward the low-temperature cold source pipe and the refrigerant pipe through the gaps between the plates of the plate heat exchanger.

4. The building natural gas decompression, cooling and power generation combined energy-saving system according to claim 1, characterized in that: The low-temperature cooling source pipeline is made of copper, and the refrigerant pipeline is also made of copper.

5. The building natural gas decompression, cooling and power generation combined energy-saving system according to claim 1, characterized in that: The pressure difference generator of the natural gas pressure difference power generation system adopts at least one of a turbine, a steam turbine, a screw expander or an annular channel generator.

6. The building natural gas decompression, cooling and power generation combined energy-saving system according to claim 5, characterized in that: The natural gas pressure difference power generation system is further provided with a heat exchange pipe, and the heat exchange pipe is arranged outside the pressure difference generator; The heat exchange pipe is provided with a flowing liquid, called heat exchange fluid, and the heat exchange pipe is also provided with a pump for driving the heat exchange fluid to flow; The heat exchange pipe also flows into the heat exchanger as another low-temperature cold source pipe.

7. The building natural gas decompression, cooling and power generation combined energy-saving system according to claim 5, characterized in that: The natural gas pressure difference power generation system is further provided with a metal heat exchange plate, wherein at least four heat exchange plates are arranged outside the pressure difference generator; A hot air blower is also provided for heating the pressure difference generator.

8. The building natural gas decompression, cooling and power generation combined energy-saving system according to claim 1, characterized in that: An inlet and an outlet of each of the heat exchanger refrigerant pipes are connected to the switching valve, and the switching valve has a state of simultaneously disconnecting the heat exchanger refrigerant pipes and a state of opening one of the two heat exchanger refrigerant pipes.

9. The building natural gas decompression, cooling and power generation combined energy-saving system according to claim 1, characterized in that: The central air conditioning system further comprises a refrigerant pipeline, the inlet and outlet of the refrigerant pipeline are also connected to the switching valve; When the switching valve opens the refrigerant pipeline, the refrigerant pipe and the refrigerant pipeline are connected to form a circulation loop.

10. The building natural gas decompression, cooling and power generation combined energy-saving system according to claim 1, characterized in that: The switching valve is an electromagnetically controlled switching valve.

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