Heat exchange device of fuel gas pressure reduction pry

Abstract

The utility model belongs to the technical field of heat exchange equipment, and particularly relates to a heat exchange device of a gas pressure reduction pry. The heat exchange device of the fuel gas pressure reducing pry comprises a tank body filled with a heat exchange medium, the tank body is provided with a heating mechanism, a primary heat exchange pipeline and a secondary heat exchange pipeline are arranged in the tank body, a gas inlet of the primary heat exchange pipeline is connected with a high-pressure gas source, and a gas outlet of the primary heat exchange pipeline is connected with a high-pressure pressure reducing valve; an air inlet of the secondary heat exchange pipeline is connected with the high-pressure reducing valve, and an air outlet is connected with the medium-pressure reducing valve; wherein the primary heat exchange pipeline comprises a spiral winding pipe, and the axis of the spiral winding pipe is consistent with the axis of the tank body; the secondary heat exchange pipeline comprises a folded reciprocating pipe, the plane of the folded reciprocating pipe is consistent with the axial section of the tank body, and the primary operation time of fuel gas in the primary heat exchange pipeline is not less than two times of the primary operation time of the fuel gas in the secondary heat exchange pipeline; the heat exchange device of the gas pressure reduction pry is a multi-time heat exchange device matched with gradient type gas pressure reduction, and has the advantages of being high in heat exchange efficiency, good in temperature rising effect and safe and stable in gas pressure regulation.

Description

Technical Field

[0001] This utility model belongs to the technical field of heat exchange equipment, specifically relating to a heat exchange device for a gas pressure reducing skid. Background Technology

[0002] A gas pressure reducing skid (pressure regulating station) is an integrated, skid-mounted gas pressure regulating (pressure reducing) and metering device. It is a complete independent unit that pre-assembles and fixes key equipment, valves, pipelines, instruments and safety control devices necessary for reducing gas pressure and metering gas flow in the gas transmission and distribution system in the factory according to specific process requirements, on an integral steel structure frame base ("skid").

[0003] The sudden drop in pressure (adiabatic expansion throttling) of gas causes a very drastic temperature drop, which is a major threat to the safe and stable operation of pressure regulating stations. It can cause a series of serious problems such as gas hydrate ice blockage, embrittlement and failure of equipment materials, and instrument failure, threatening the safety, stability and reliability of gas supply.

[0004] Existing pressure reducing skids are equipped with separate heating mechanisms, which have poor integration with the skid structure. They generally use electric heating coils or similar devices to directly heat the gas pipeline, resulting in low heat transfer efficiency and certain safety risks. The heat exchange effect is not ideal, which affects the normal operation of the pressure regulator. Utility Model Content

[0005] The purpose of this invention is to provide a multi-stage heat exchange device that works in conjunction with gradient gas pressure reduction, featuring high heat exchange efficiency, good heating effect, and safe and stable gas pressure regulation.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A heat exchange device for a gas pressure reducing skid, characterized in that: it includes a tank filled with a heat exchange medium, the tank having a heating mechanism, a primary heat exchange pipeline and a secondary heat exchange pipeline arranged inside the tank, the inlet of the primary heat exchange pipeline being connected to a high-pressure gas source, and its outlet being connected to a high-pressure pressure reducing valve; the inlet of the secondary heat exchange pipeline being connected to the high-pressure pressure reducing valve, and its outlet being connected to a medium-pressure pressure reducing valve; wherein, the primary heat exchange pipeline includes a spiral wound tube, the axis of which is aligned with the axis of the tank; the secondary heat exchange pipeline includes a folded reciprocating tube, the plane of which is aligned with the axial section of the tank, and the gas's one-time running time in the primary heat exchange pipeline is not less than twice the one-time running time in the secondary heat exchange pipeline.

[0008] Additional technical features constituting the heat exchange device of the aforementioned gas pressure reducing skid also include:

[0009] —The high-pressure reducing valve lowers the high-pressure gas to a sub-high-pressure level of no more than 1.6 MPa, and the medium-pressure reducing valve lowers the sub-high-pressure gas to a medium-pressure level of no more than 0.4 MPa;

[0010] The heating mechanism includes an inlet and an outlet on the tank body, which are connected by a circulation pipeline, and a heating boiler and a power pump are installed on the circulation pipeline.

[0011] —The heating mechanism includes several electric heating rods or electric heating plates disposed at the bottom of the tank;

[0012] It also includes a PLC controller for linkage adjustment, wherein the PLC controller is electrically connected to the flow sensor and temperature sensor installed on the tank and / or the primary heat exchange pipeline and the secondary heat exchange pipeline.

[0013] Compared with the prior art, the heat exchange device for a gas pressure reducing skid provided by this utility model has the following advantages: The tank of this heat exchange device is equipped with a primary heat exchange pipeline and a secondary heat exchange pipeline, which are sequentially connected to a high-pressure reducing valve and a medium-pressure reducing valve, respectively. During the gradient reduction of gas pressure from (ultra) high pressure, sub-high pressure, to medium (low) pressure, preheating is performed before each pressure adjustment, achieving multiple heat exchange effects and avoiding problems such as gas hydrate blockage and frost formation caused by pressure reduction, thus ensuring stable and safe gas regulation. Secondly, the primary heat exchange pipeline is a spiral wound tube with its axis aligned with the tank's axis; the secondary heat exchange pipeline is folded... The reciprocating tube has a plane that is consistent with the axial section of the tank. The gas runs for at least twice as long in the primary heat exchange line as it does in the secondary heat exchange line. The spiral wound tube is laid along the inner wall of the tank, while the folded reciprocating tube is laid along the axial section of the tank. Compared with the secondary heat exchange line, the primary heat exchange time is significantly longer than the secondary heat exchange time. This avoids the problem of ice blockage caused by a sudden pressure drop (adiabatic expansion throttling) during the (ultra) high pressure to secondary high pressure adjustment. The secondary heat exchange time is short, ensuring stable flow velocity and flow rate during the pressure drop process. This improves the safety performance of the gas pressure regulator. The device has the advantages of simple structure, safe use, economy and durability. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the heat exchange device of a gas pressure reducing skid according to the present invention. Detailed Implementation

[0015] The structure and working principle of the heat exchange device of the gas pressure reducing skid provided by this utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0016] In the description of this utility model, unless otherwise stated, the orientation or positional relationship indicated in the terminology is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this utility model and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0017] It should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "set / equipped" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0018] like Figure 1 As shown, the heat exchange device structure of the gas pressure reducing skid includes a tank 1 filled with heat exchange medium a, the tank 1 is equipped with a heating mechanism, and a primary heat exchange pipeline 21 and a secondary heat exchange pipeline 22 are arranged inside the tank 1. The inlet 31 of the primary heat exchange pipeline 21 is connected to a high-pressure gas source, and its outlet 32 ​​is connected to a high-pressure pressure reducing valve 41; the inlet 33 of the secondary heat exchange pipeline 22 is connected to the high-pressure pressure reducing valve 41, and its outlet 34 is connected to a medium-pressure pressure reducing valve 42; wherein, the primary heat exchange pipeline 21 includes a spiral wound tube, the axis of which is consistent with the axis of the tank 1; the secondary heat exchange pipeline 22 includes a folded reciprocating tube, the plane of which is consistent with the axial section of the tank 1, and the gas runs once in the primary heat exchange pipeline 21 for no less than twice the running time in the secondary heat exchange pipeline 22.

[0019] Its working principle is as follows: The tank body 1 of the device is assembled with the gas pressure reducing skid. The inside is filled with heat exchange medium a and the heat exchange medium a is heated to a certain temperature through a heating mechanism. The tank body 1 is equipped with a primary heat exchange pipeline 21 and a secondary heat exchange pipeline 22, which are used for preheating during the gas gradient pressure reduction process to avoid problems such as ice blockage and frost caused by pressure drop. Specifically, the inlet of the primary heat exchange pipeline 21 is connected to a high-pressure gas source, and its outlet is connected to a high-pressure pressure reducing valve; the inlet of the secondary heat exchange pipeline 22 is connected to a high-pressure pressure reducing valve, and its outlet is connected to a medium-pressure pressure reducing valve.

[0020] Since the initial pressure drop is much greater than the secondary pressure drop, it is crucial to ensure that there are no problems with the initial pressure regulation. The primary heat exchange pipeline 21 is set as a spiral wound pipe with its axis aligned with the axis of the tank 1. The secondary heat exchange pipeline 22 is set as a folded reciprocating pipe with its plane aligned with the axial section of the tank 1. The running time of the gas in the primary heat exchange pipeline 21 is no less than twice the running time in the secondary heat exchange pipeline 22.

[0021] It should be noted that the above-mentioned operating time refers to the process time of the gas from the inlet to the outlet of the heat exchange pipeline. The difference between the two operating times can be determined by the different lengths or diameters of the heat exchange pipelines within tank 1.

[0022] In the heat exchange device structure constituting the aforementioned gas pressure reducing skid

[0023] —In one embodiment, the heat exchange medium a inside tank 1 is kept at a temperature of 40℃-60℃ by a heating structure, and the high-pressure gas is at about 20 MPa. It passes through the primary heat exchange pipeline 21 with a flow rate of 15 m / s and a running time of about 5 seconds. Then it is reduced to no more than 1.6 MPa by the high-pressure reducing valve 41. The gas at this high-pressure level is then introduced into the secondary heat exchange pipeline 22 inside tank 1 with a flow rate of 15 m / s and a running time of 0.5-1.5 seconds. Then it is reduced to no more than 0.4 MPa by the medium-pressure reducing valve 42.

[0024] —Preferredly, the heating mechanism includes an inlet 51 and an outlet 52 on the tank body 1, which are connected by a circulation pipeline 53. A heating boiler 54 and a power pump 55 are installed on the circulation pipeline 53. The heating boiler 54 can be heated by electricity, coal, etc., or the medium-pressure gas after secondary pressure regulation can be directly used for heating the boiler 54, thereby improving heating efficiency and recycling of heat exchange medium a, realizing energy self-sufficiency inside the pressure reducing skid, and further reducing the operating cost of the pressure regulating station, resulting in good economic benefits.

[0025] — Preferably, the heating mechanism can also be provided with several electric heating rods 6 or electric heating plates at the bottom of the tank 1, that is, a dual heating method is adopted, which further improves the heating efficiency of the heat exchange medium a and ensures the safety and stability of the pressure regulation process.

[0026] —As a preferred embodiment, the heat exchange device includes a PLC controller 7 for linkage adjustment. The PLC controller 7 can be controlled independently or integrated with the controller function of the pressure reducing skid. The PLC controller 7 is electrically connected to the flow sensor and temperature sensor 71 installed on the tank 1 and / or the primary heat exchange pipeline 21 and the secondary heat exchange pipeline 22. It is used to monitor the temperature, flow rate and other parameters of the heat exchange medium a and the gas in real time, and to perform linkage adjustment. It can also adjust the power of the heating mechanism and the start and stop of the pressure reducing valve in real time, thereby improving the safety performance of the pressure reducing skid.

[0027] The aforementioned electrical connections include necessary power lines, communication lines, solenoid valve assemblies, and sensor components.

[0028] The above-described embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit the implementation of this utility model. Therefore, any other modifications or equivalent substitutions to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. A heat exchange device of a gas pressure reducing pry, characterized in that: The system includes a tank filled with a heat exchange medium, the tank having a heating mechanism, and a primary heat exchange pipeline and a secondary heat exchange pipeline installed inside the tank. The inlet of the primary heat exchange pipeline is connected to a high-pressure gas source, and its outlet is connected to a high-pressure pressure reducing valve. The inlet of the secondary heat exchange pipeline is connected to the high-pressure pressure reducing valve, and its outlet is connected to a medium-pressure pressure reducing valve. The primary heat exchange pipeline includes a spiral wound tube with its axis aligned with the tank's axis. The secondary heat exchange pipeline includes a folded reciprocating tube with its plane aligned with the tank's axial cross-section. The gas's operating time in the primary heat exchange pipeline is no less than twice the operating time in the secondary heat exchange pipeline.

2. The heat exchange device of a gas pressure reducing wrench according to claim 1, characterized in that: The high-pressure reducing valve lowers the high-pressure gas to a sub-high-pressure level of no more than 1.6 MPa, and the medium-pressure reducing valve lowers the sub-high-pressure gas to a medium-pressure level of no more than 0.4 MPa.

3. The heat exchange device of the gas pressure reducing wrench according to claim 1, characterized in that: The heating mechanism includes an inlet and an outlet on the tank body, which are connected by a circulation pipeline, and a heating boiler and a power pump are installed on the circulation pipeline.

4. The heat exchange device of the gas pressure reducing wrench according to claim 1, characterized in that: The heating mechanism includes several electric heating rods or electric heating plates disposed at the bottom of the tank.

5. The heat exchange device for a gas pressure reducing skid according to claim 1, characterized in that: It also includes a PLC controller for linkage adjustment, wherein the PLC controller is electrically connected to the flow sensor and temperature sensor installed on the tank and / or the primary heat exchange pipeline and the secondary heat exchange pipeline.

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