Natural gas gate station pressure regulating and temperature recovery system

Abstract

The utility model relates to a natural gas door station pressure regulating rewarming system, including pressure regulating valve, turbine, compressor, first rewarming device, second rewarming device, heat exchanger and outdoor heat absorber, and first rewarming device and second rewarming device correspond to be equipped with first rewarming coil pipe and second rewarming coil pipe, and heat exchanger is equipped with heat exchange coil pipe and refrigerant coil pipe, and the both ends of pressure regulating valve correspond to be connected with first natural gas input pipeline and first natural gas output pipeline, and first natural gas output pipeline passes through first rewarming device, and the both ends of turbine correspond to be connected with second natural gas input pipeline and second natural gas output pipeline, and second natural gas output pipeline passes through second rewarming device, and compressor is connected with turbine, and compressor, refrigerant coil pipe and outdoor heat absorber are connected gradually and constitute refrigerant circuit, and the both ends of heat exchange coil pipe and the both ends of second rewarming coil pipe are connected gradually and constitute heat exchange circuit, and first rewarming coil pipe and second rewarming coil pipe are in parallel, it has simple structure, strong function, safe and reliable advantage.

Description

Technical Field

[0001] This utility model relates to a natural gas gate station, specifically to a pressure regulating and reheating system for a natural gas gate station. Background Technology

[0002] Natural gas gate stations are key facilities in natural gas transmission and distribution systems, typically located at the junction of long-distance pipelines and urban natural gas networks. They perform important functions such as receiving, purifying, regulating pressure, metering, and monitoring the safety of natural gas. Natural gas gate stations regulate the pressure of natural gas through pressure regulating valves. During this process, two effects occur: firstly, high-pressure natural gas releases pressure energy as it is throttled and depressurized to become low-pressure natural gas; secondly, the adiabatic expansion of the natural gas causes a temperature drop due to the Joule-Thomson effect. The temperature of natural gas in long-distance pipelines is usually low. When its temperature approaches freezing point, the temperature of the regulated natural gas will drop below freezing point, easily causing ice to form inside pipeline valves and sealing materials, leading to ice blockage and affecting the safe operation of the pipeline. Furthermore, when the natural gas temperature remains below 0°C for an extended period, it can cause frost heave in the surrounding soil, potentially damaging nearby roads and buildings. To avoid the adverse effects of temperature drop, natural gas gate stations are typically equipped with reheating devices, such as… Figure 1 As shown, the existing natural gas gate station mainly includes a first pressure regulating valve a1, a first water bath reheating device b1, a second pressure regulating valve a2, a second water bath reheating device b2, a third pressure regulating valve a3, and a natural gas boiler b3. The input ends of the first pressure regulating valve a1, the second pressure regulating valve a2, and the third pressure regulating valve a3 are interconnected and connected to the high-pressure natural gas pipeline. The output ends of the first pressure regulating valve a1 and the second pressure regulating valve a2 are respectively connected to the low-pressure natural gas pipelines passing through the first water bath reheating device b1 and the second water bath reheating device b2. The output end of the third pressure regulating valve a3 is connected to the burner of the natural gas boiler b3. The boiler coil in the natural gas boiler b3 is connected to the reheating coil in the first water bath reheating device b1 and the second water bath reheating device b2 through pipelines to form a heat exchange loop, so that the natural gas boiler b3 can provide the heat required for reheating the first water bath reheating device b1 and the second water bath reheating device b2. Although the existing natural gas gate station avoids the adverse effects of temperature drop through reheating, it does not recover and utilize pressure energy, and the natural gas boiler b3 consumes a large amount of natural gas, resulting in energy waste. Utility Model Content

[0003] The purpose of this invention is to provide a natural gas gate station pressure regulation and reheating system, which has the advantages of simple structure, low cost, strong functionality, good safety and high reliability.

[0004] To address the aforementioned problems in the existing technology, this utility model provides a natural gas gate station pressure regulating and reheating system, including a pressure regulating valve, a turbine, a compressor, a first reheater, a second reheater, a heat exchanger, and an outdoor heat absorber. The first and second reheaters are water bath type reheaters, each equipped with a first reheating coil and a second reheating coil. The heat exchanger is a water bath type, containing a heat exchange coil and a refrigerant coil. The two ports of the pressure regulating valve are connected to a first natural gas input pipeline and a first natural gas output pipeline. A first control valve is installed on the first natural gas input pipeline. The first natural gas output pipeline passes through the first reheater. The two ports of the turbine are connected to the second... The system includes a natural gas input pipeline and a second natural gas output pipeline. The second natural gas input pipeline is equipped with a second control valve and is connected to the first natural gas input pipeline upstream of the first control valve. The second natural gas output pipeline passes through a second reheater and is connected to the first natural gas output pipeline downstream of the first reheater. The compressor is connected to the turbine via a coupling. The compressor, refrigerant coil, and outdoor heat absorber are connected end-to-end in sequence to form a refrigerant circuit. A first throttling valve is installed on the refrigerant pipeline between the outdoor heat absorber and the refrigerant coil. The two ends of the heat exchange coil are connected end-to-end with the two ends of the second reheat coil to form a heat exchange circuit. The first and second reheat coils are connected in parallel.

[0005] Furthermore, the present invention provides a natural gas gate station pressure regulation and reheating system, which also includes radiators installed in the office area. The heat exchanger is also equipped with a heating coil, and the two ends of the heating coil are connected to the two ends of the radiator in sequence to form a heating circuit.

[0006] Furthermore, the present invention provides a natural gas gate station pressure regulation and reheating system, which also includes a chiller installed in the office area. The two ports of the chiller are connected to the outlet of the refrigerant coil and the inlet of the compressor, respectively. A second throttle valve is provided on the refrigerant pipeline between the chiller and the refrigerant coil.

[0007] Furthermore, in this utility model, a natural gas gate station pressure regulating and reheating system is provided, wherein the heating radiator is provided in two or more parts, and all the heating radiators are connected in series in sequence.

[0008] Furthermore, in this utility model, a natural gas gate station pressure regulating and reheating system is provided, wherein both the first control valve and the second control valve are pneumatic valves.

[0009] Furthermore, this utility model provides a natural gas gate station pressure regulation and reheating system, wherein a first circulating pump is provided on the heat exchange circuit and a second circulating pump is provided on the heating circuit.

[0010] Furthermore, in this utility model, a natural gas gate station pressure regulating and reheating system is provided, wherein a switching valve is provided on the refrigerant pipeline between the refrigeration unit and the refrigerant coil.

[0011] Compared with existing technologies, this utility model of a natural gas gate station pressure regulating and reheating system has the following advantages: This utility model includes a pressure regulating valve, a turbine, a compressor, a first reheater, a second reheater, a heat exchanger, and an outdoor heat absorber. The first and second reheaters are water-bath type reheaters, each equipped with a first and second reheating coil. The heat exchanger is a water-bath type, containing a heat exchange coil and a refrigerant coil. The two ports of the pressure regulating valve are connected to a first natural gas input pipeline and a first natural gas output pipeline. A first control valve is installed on the first natural gas input pipeline, allowing the first natural gas output pipeline to pass through the first reheater. The two ports of the turbine are connected to a second natural gas output pipeline. The system comprises an inlet pipeline and a second natural gas outlet pipeline. A second control valve is installed on the second natural gas inlet pipeline, connecting it to the first natural gas inlet pipeline upstream of the first control valve. The second natural gas outlet pipeline passes through a second reheater, connecting it to the first natural gas outlet pipeline downstream of the first reheater. The compressor is connected to the turbine via a coupling. The compressor, refrigerant coil, and outdoor receiver are sequentially connected end-to-end to form a refrigerant circuit. A first throttling valve is installed on the refrigerant pipeline between the outdoor receiver and the refrigerant coil, allowing the two ends of the heat exchange coil to be sequentially connected end-to-end to the two ends of the second reheat coil, forming a heat exchange circuit. The first and second reheat coils are connected in parallel. This constitutes a natural gas gate station pressure regulating and reheating system that is simple in structure, low in cost, highly functional, safe, and reliable. In practical applications, the first natural gas inlet pipeline is connected to the high-pressure natural gas pipeline, and the first natural gas outlet pipeline is connected to the low-pressure natural gas pipeline. During system operation, on one hand, a pressure regulating valve is used to convert high-pressure natural gas into low-pressure natural gas, which is then transported to the low-pressure natural gas pipeline through the first natural gas output pipeline. On the other hand, a turbine is used to convert high-pressure natural gas into low-pressure natural gas and introduce it into the first natural gas output pipeline. Simultaneously, during turbine operation, the compressor is driven, causing the refrigerant to circulate in the refrigerant circuit. During this circulation, the refrigerant absorbs heat from the air at the outdoor heat absorber and releases heat through the refrigerant coil at the heat exchanger. This heat exchange circuit provides the necessary heat for heating the low-temperature natural gas in the first and second rethermal units. This invention, by setting up a turbine, compressor, heat exchanger, and outdoor heat absorber, and using the turbine to drive the compressor, forming a refrigerant circuit with the compressor, refrigerant coil, and outdoor heat absorber, achieves pressure energy recovery and utilization through the turbine, without consuming natural gas to heat low-temperature natural gas, thus reducing energy consumption and saving costs.

[0012] The following detailed description of a natural gas gate station pressure regulation and reheating system according to the present invention, with reference to the accompanying drawings, illustrates the specific embodiments. Attached Figure Description

[0013] Figure 1 A schematic diagram of the pressure regulating and reheating pipeline of an existing natural gas gate station;

[0014] Figure 2 This is a schematic diagram of the structure of a natural gas gate station pressure regulation and reheating system according to the present invention. Detailed Implementation

[0015] First, it should be noted that the directional terms such as up, down, left, right, front, and back mentioned in this utility model are only descriptions based on the accompanying drawings for ease of understanding, and are not intended to limit the technical solution or the scope of protection claimed in this utility model.

[0016] like Figure 1 The present invention discloses a specific embodiment of a natural gas gate station pressure regulating and reheating system, comprising a pressure regulating valve 1, a turbine 2, a compressor 3, a first reheater 4, a second reheater 5, a heat exchanger 6, and an outdoor heat absorber 7. The first and second reheaters 4 and 5 are water bath type reheaters, each equipped with a first reheating coil and a second reheating coil respectively. The heat exchanger 6 is a water bath type heat exchanger, equipped with a heat exchange coil and a refrigerant coil. The two ports of the pressure regulating valve 1 are connected to a first natural gas input pipeline and a first natural gas output pipeline respectively. A first control valve 11 is installed on the first natural gas input pipeline, allowing the first natural gas output pipeline to pass through the first reheater 4. Connect the two ports of turbine 2 to the second natural gas input pipeline and the second natural gas output pipeline respectively. Install a second control valve 21 on the second natural gas input pipeline, and connect the second natural gas input pipeline to the first natural gas input pipeline upstream of the first control valve 11. Pass the second natural gas output pipeline through the second reheater 5, and connect the second natural gas output pipeline to the first natural gas output pipeline downstream of the first reheater 4. Connect compressor 3 to turbine 2 via a coupling. Connect compressor 3, refrigerant coil, and outdoor heat absorber 7 sequentially to form a refrigerant circuit. Install a first throttling valve 71 on the refrigerant pipeline between outdoor heat absorber 7 and refrigerant coil. Connect the two ports of heat exchange coil and the two ports of the second reheater coil sequentially to form a heat exchange circuit, and connect the first and second reheater coils in parallel.

[0017] The above setup constitutes a natural gas gate station pressure regulating and reheating system that is simple in structure, low in cost, highly functional, safe, and reliable. In practical applications, the first natural gas input pipeline is connected to the high-pressure natural gas pipeline, and the first natural gas output pipeline is connected to the low-pressure natural gas pipeline. During system operation, on the one hand, the pressure regulating valve 1 is used to adjust the high-pressure natural gas to low-pressure natural gas and deliver it to the low-pressure natural gas pipeline through the first natural gas output pipeline. On the other hand, the turbine 2 also converts the high-pressure natural gas to low-pressure natural gas and introduces it into the first natural gas output pipeline. Simultaneously, during the operation of the turbine 2, the compressor 3 is driven to run, causing the refrigerant to circulate in the refrigerant circuit. During the circulation process, the refrigerant absorbs heat from the air at the outdoor heat absorber 7 and releases heat through the refrigerant coil at the heat exchanger 6. The heat exchange circuit provides the necessary heat for heating the low-temperature natural gas in the first reheater 4 and the second reheater 5. This invention, by setting up a turbine 2, a compressor 3, a heat exchanger 6, and an outdoor heat absorber 7, utilizes the turbine 2 to drive the compressor 3, and forms a refrigerant circuit with the compressor 3, refrigerant coil, first throttle valve 71, and outdoor heat absorber 7. Compared with existing natural gas gate stations, this invention achieves pressure energy recovery and utilization through the turbine 2, achieving the technical objective of heating low-temperature natural gas without consuming natural gas, thus reducing energy consumption and saving costs. It should be noted that the compressor 3 is connected to the turbine 2 via a coupling, meaning that the drive input shaft of the compressor 3 is connected to the power output shaft of the turbine 2 via the coupling; the outdoor heat absorber 7 refers to a heat exchanger installed outdoors, the structure and principle of which are well known to those skilled in the art.

[0018] As an optimization, this specific embodiment includes a radiator 8 located in the office area, with a heating coil installed in the heat exchanger 6. The two ends of the heating coil are sequentially connected to the two ends of the radiator 8 to form a heating circuit. During winter system operation, this configuration allows the heating circuit to provide the necessary heat to the radiator 8 via the heat exchanger 6, improving functionality and practicality. During summer system operation, the heating circuit can be shut down. As another optimization, this specific embodiment also includes a chiller 9 located in the office area, with its two ends connected to the outlet of the refrigerant coil and the inlet of the compressor 3, respectively. A second throttling valve 91 is installed on the refrigerant pipeline between the chiller 9 and the refrigerant coil. During summer system operation, by running the chiller 9 and shutting down the heating circuit and the outdoor heat absorber 7, cooling is achieved by the refrigerant absorbing heat from the air at the chiller 9. It should be noted that, in order to enable the heat exchange circuit and the heating circuit to operate in a cyclic manner, the present invention provides a first circulation pump (not shown in the figure) and a second circulation pump (not shown in the figure) in the heat exchange circuit and the heating circuit respectively; in order to facilitate switching between the outdoor heat absorber 7 and the cooler 9, the present invention also provides a switch valve (not shown in the figure) on the refrigerant pipeline between the refrigerant coil and the outdoor heat absorber 7 and the cooler 9 respectively.

[0019] In practical applications, this invention typically uses two or more radiators 8 to improve heating efficiency, and all radiators 8 are connected in series sequentially for easy installation. To enhance control convenience, this invention uses pneumatic valves for both the first control valve 11 and the second control valve 21.

[0020] The above embodiments are merely descriptions of preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Any modifications made by those skilled in the art based on the technical solution of the present utility model without departing from the design concept of the present utility model shall fall within the scope of protection defined by the claims of the present utility model.

Claims

1. A natural gas gate station pressure regulating and temperature regulating system, characterized by, The system includes a pressure regulating valve (1), a turbine (2), a compressor (3), a first rethermator (4), a second rethermator (5), a heat exchanger (6), and an outdoor heat absorber (7). The first rethermator (4) and the second rethermator (5) are water bath type rethermators, and the first rethermator (4) and the second rethermator (5) are respectively equipped with a first rethermator coil and a second rethermator coil. The heat exchanger (6) is a water bath type heat exchanger, and the heat exchanger (6) is equipped with a heat exchange coil and a refrigerant coil. The two ports of the pressure regulating valve (1) are respectively connected to a first natural gas input pipeline and a first natural gas output pipeline. The first natural gas input pipeline is equipped with a first control valve (11). The first natural gas output pipeline passes through the first rethermator (4). The two ports of the turbine (2) are respectively connected to a second natural gas input pipeline and a second rethermator coil. The natural gas output pipeline has a second control valve (21) on the second natural gas input pipeline. The second natural gas input pipeline is connected to the first natural gas input pipeline upstream of the first control valve (11). The second natural gas output pipeline passes through the second reheater (5) and is connected to the first natural gas output pipeline downstream of the first reheater (4). The compressor (3) is connected to the turbine (2) through a coupling. The compressor (3), refrigerant coil and outdoor heat absorber (7) are connected end to end in sequence to form a refrigerant circuit. The refrigerant pipeline between the outdoor heat absorber (7) and the refrigerant coil is equipped with a first throttle valve (71). The two ends of the heat exchange coil and the two ends of the second reheat coil are connected end to end in sequence to form a heat exchange circuit. The first reheat coil and the second reheat coil are connected in parallel.

2. The natural gas gate station pressure regulating and reheating system according to claim 1, characterized in that, It also includes radiators (8) installed in the office area, and the heat exchanger (6) is also equipped with a heating coil. The two ends of the heating coil are connected to the two ends of the radiator (8) in sequence to form a heating circuit.

3. The natural gas gate station pressure regulating and reheating system according to claim 2, characterized in that, It also includes a refrigeration unit (9) installed in the office area. The two ports of the refrigeration unit (9) are connected to the outlet of the refrigerant coil and the inlet of the compressor (3). A second throttle valve (91) is provided on the refrigerant pipeline between the refrigeration unit (9) and the refrigerant coil.

4. The natural gas gate station pressure regulating and reheating system according to claim 3, characterized in that, The heating radiator (8) is provided in two or more parts, and all the heating radiators (8) are connected in series in sequence.

5. The natural gas gate station pressure regulating and reheating system according to claim 3, characterized in that, Both the first control valve (11) and the second control valve (21) are pneumatic valves.

6. The natural gas gate station pressure regulating and reheating system according to claim 3, characterized in that, The heat exchange circuit is equipped with a first circulation pump, and the heating circuit is equipped with a second circulation pump.

7. The natural gas gate station pressure regulating and reheating system according to claim 3, characterized in that, A switching valve is provided on the refrigerant pipeline between the refrigeration unit (9) and the refrigerant coil.

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