Dual-system heat exchange device of natural gas pressure regulating station

Abstract

The utility model provides a dual-system heat exchange device of a natural gas pressure regulating station, which adopts a horizontal cylinder body, the cylinder body is provided with two groups of anti-explosion electric heaters, and a high-temperature heat source heat exchange tube and an NG heat exchange tube are further arranged in the cylinder body. Two pipe orifices of the high-temperature heat source heat exchange pipe on the horizontal cylinder are fixedly arranged at the shell end on the same side as the control part of one group of anti-explosion electric heaters; two pipe orifices of the NG heat exchange pipe on the horizontal cylinder are fixedly arranged at the shell end on the same side as the control part of the other group of anti-explosion electric heaters; the liquid level switch and the temperature transmitter are respectively and electrically connected with the control circuit and are arranged on the horizontal cylinder body; and the control circuit is respectively and electrically connected with and controls the two groups of anti-explosion electric heaters. A high-heat heat source of a station is fully utilized to form an integrated NG heat exchange structure with electric heating, the structure is compact, the energy consumption is reduced, the safety and the stability of gas transmission are effectively guaranteed, and the device is very suitable for an NG heat exchange pressure regulating system.

Description

Technical Field

[0001] The utility model belongs to the technical field of natural gas transmission systems, and in particular relates to a dual-system heat exchange device suitable for a natural gas pressure regulating station. Background Art

[0002] At present, my country mainly uses single heating systems such as electric heating, steam heating, and hot water boiler heating in NG heat exchange and pressure regulating devices. When the power supply of the heat exchanger in the natural gas field fails, the entire natural gas pressure regulating station will stop working. If the natural gas temperature is low, it may also cause unheated natural gas to enter the downstream pipeline network, causing the risk of ice blockage and freezing cracking of the downstream pipeline network. Utility Model Content

[0003] Since most stations have abundant high-temperature heat source media, such as steam or high-temperature thermal oil, this utility model fully utilizes the station's existing high-temperature heat source and its connecting pipelines, and cooperates with the electric heating structure to achieve dual heat source supply for the natural gas pressure regulating station. This utility model provides the following technical solutions:

[0004] A dual-system heat exchange device for a natural gas pressure regulating station comprises a sealed horizontal cylinder with its axis positioned horizontally, saddle legs fixedly supported on both sides of the bottom of the horizontal cylinder, and heat exchange fluid contained within the cylinder. The horizontal cylinder is equipped with two sets of explosion-proof electric heaters, the control portions of the two sets of explosion-proof electric heaters being fixedly mounted on the exterior of the shell at both ends of the horizontal cylinder in the axial direction, the heating rods of the two sets of explosion-proof electric heaters extending horizontally along the axial direction, and the ends of the heating rods of the two sets of explosion-proof electric heaters extending to leave a horizontal gap between them.

[0005] The horizontal cylinder is also provided with a high-temperature heat source heat exchange tube and an NG heat exchange tube. The two pipe openings of the high-temperature heat source heat exchange tube on the horizontal cylinder are fixedly arranged at the shell end on the same side as the control part of one group of explosion-proof electric heaters; the two pipe openings of the NG heat exchange tube on the horizontal cylinder are fixedly arranged at the shell end on the same side as the control part of the other group of explosion-proof electric heaters.

[0006] The high-temperature heat source heat exchange tube and the NG heat exchange tube both have the heating rods of the two sets of explosion-proof electric heaters located in their inner areas, and the high-temperature heat source heat exchange tube is located between the heating rods and the NG heat exchange tube;

[0007] Also includes

[0008] The liquid level switch is located at the lowest working liquid level in the horizontal cylinder and is electrically connected to the control circuit outside the cylinder via a cable. It is used to detect whether the liquid level is lower than the minimum allowable working level and transmit the signal to the control circuit;

[0009] Temperature transmitter for detecting the temperature of the heat exchange liquid in the horizontal cylinder and electrically connected to the control circuit through a cable to transmit the detected temperature signal to the control circuit;

[0010] The control circuit is also electrically connected to control the two groups of explosion-proof electric heaters.

[0011] Further, the NG heat exchange pipe adopts a spiral coil structure, and the heating rod parts of the two groups of explosion-proof electric heaters are partially surrounded in the middle region; or, both the high-temperature heat source heat exchange pipe and the NG heat exchange pipe adopt a spiral coil structure, and the heating rod parts of the two groups of explosion-proof electric heaters are partially surrounded in the middle region, that is, the heating rod parts of the two groups of explosion-proof electric heaters are located in the central region, the high-temperature heat source heat exchange pipe is located in the middle layer, and the NG heat exchange pipe is located in the outermost layer.

[0012] Further, the two pipe openings of the high-temperature heat source heat exchange pipe and the NG heat exchange pipe on the horizontal cylinder are respectively arranged at two sides of the control part of the explosion-proof electric heater in the horizontal direction.

[0013] Further, the horizontal cylinder is also provided with

[0014] An exhaust valve capable of automatically reducing the pressure to a safe value through the exhaust valve when the pressure in the horizontal cylinder reaches a threshold value;

[0015] A liquid level meter capable of measuring and displaying the liquid level information of the heat exchange liquid in the horizontal cylinder through the part extending into the horizontal cylinder.

[0016] A first temperature meter capable of measuring and displaying the liquid temperature information of the heat exchange liquid in the horizontal cylinder through the part extending into the horizontal cylinder.

[0017] Further, a second temperature meter connected to the pipeline at the high-temperature heat source inlet and used for detecting and displaying the temperature of the high-temperature heat source medium input into the high-temperature heat source inlet is further included.

[0018] Further, a flow control valve connected to the pipeline at the high-temperature heat source inlet and electrically connected to the control circuit for controlling the flow of the high-temperature heat source medium input into the high-temperature heat source inlet is further configured.

[0019] Further, an annular gap is left between the outer periphery of the heating rod part of each group of explosion-proof electric heaters in the horizontal cylinder and the inner wall of the cylinder.

[0020] The utility model makes full use of the high-temperature heat source of the station itself, and the NG heat exchange structure composed of the electric heating is integrated, compact in structure, low in energy consumption, effectively guarantees the safety and stability of gas transmission, and is very suitable for NG heat exchange pressure regulating system. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings, which form a part of this patent, are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. Other embodiments of the application will be readily apparent to those of ordinary skill in the art from this disclosure, merely by applying common knowledge in the art, without departing from the scope of the application set forth in the appended claims.

[0022] Figure 1 The structural layout diagram of the present application is shown in the figure.

[0023] Figure 2 The circuit structure diagram of the present application is shown in the figure.

[0024] The reference signs in the figure: 1-horizontal cylinder; 2-exhaust valve; 3-liquid level meter; 4-liquid level switch; 5-first temperature meter; 6-temperature transmitter; 7-second temperature meter; 8-high temperature heat source inlet; 9-first explosion-proof electric heater; 10-high temperature heat source outlet; 11-high temperature heat source heat exchange pipe; 12-NG heat exchange pipe; 13-saddle leg; 14-drain valve; 15-second explosion-proof electric heater; 16-NG inlet; 17-NG outlet; 18-control circuit; 8-1-flow control valve. DETAILED DESCRIPTION

[0025] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0026] In the description of the embodiments of the present application, it should be noted that the indicated orientation or position relationship is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship commonly used when the product of the application is placed, or the orientation or position relationship commonly understood by those skilled in the art, which is only for the convenience of describing the present application or simplifying the description, and is not intended to indicate or imply that the indicated device or element must have a particular orientation, be constructed or operated in a particular orientation, and therefore should not be understood as a limitation of the present application.

[0027] The "multiple" in the present application refers to two or more (including two). The terms "first", "second", etc. are only used for distinguishing description and should not be understood as indicating or implying relative importance.

[0028] Unless otherwise clearly specified and limited, the terms "arrange", "mount", "connect" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be direct connection, or indirect connection through intermediate medium.

[0029] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0030] As shown in the figure, the cylinder of the present invention adopts a horizontal closed cylinder with its axis horizontally placed: horizontal cylinder 1. Saddle legs 13 are fixed on both sides of the bottom of horizontal cylinder 1 to fix and support horizontal cylinder 1. Most of the other components of the device are installed on the horizontal cylinder 1.

[0031] The horizontal cylinder 1 contains a liquid for heat exchange (hereinafter referred to as heat exchange liquid). The heat exchange liquid can be water or other commonly used heat exchange liquids in the prior art.

[0032] The utility model has two systems for heating the heat exchange fluid in the horizontal cylinder 1, one system is an electric heating system, and the other is a heat source system using the station's own high-temperature heat source. In order to improve the heat exchange efficiency and ensure the overall weight balance of the device, the utility model combines the characteristics of the horizontal cylinder and provides a structural layout scheme of the two systems and the NG heat exchange tube: Figure 1 As shown, the electric heating system includes two groups of explosion-proof electric heaters: a first explosion-proof electric heater 9 and a second explosion-proof electric heater 15. The control parts of the two groups of explosion-proof electric heaters are fixed outside the shell at both ends of the horizontal cylinder 1 in the axial direction (i.e., the horizontal direction). The heating rod parts penetrate into the horizontal cylinder 1 and extend horizontally along the axial direction. The ends of the heating rod parts of the two groups of explosion-proof electric heaters extend to leave a horizontal gap between each other to avoid the overlap of the two groups of heating rods in the radial direction, which leads to the inconsistency of the electric heating efficiency of the heat exchange liquid in the overlapping area with the rest of the area in the cylinder, that is, to ensure that the efficiency of heating by the electric heating system in the cylinder remains consistent.

[0033] Furthermore, an annular gap is left between the radial periphery of the heating rod part in the horizontal cylinder 1 of each group of explosion-proof electric heaters and the inner wall of the cylinder to leave space for the arrangement of the heat source system and the NG heat exchange tube.

[0034] The high-temperature heat source medium introduced by the high-temperature heat source is transported through the pipeline and flows through the high-temperature heat source heat exchange pipe 11 provided in the horizontal cylinder 1, wherein the two pipe openings of the high-temperature heat source heat exchange pipe 11 on the horizontal cylinder 1: the high-temperature heat source inlet 8 and the high-temperature heat source outlet 10 are fixedly arranged at the shell end on the same side as the control part of one group of explosion-proof electric heaters, for example Figure 1 In the embodiment shown, the high-temperature heat source inlet 8 and the high-temperature heat source outlet 10 are fixedly arranged at the housing end on the same side as the control portion of the first explosion-proof electric heater 9;

[0035] Natural gas is transported through the pipeline and flows through the NG heat exchange tube 12 provided in the horizontal cylinder 1. The two pipe openings of the NG heat exchange tube 12 on the horizontal cylinder 1: the NG inlet 16 and the NG outlet 17 are fixed at the shell end on the same side as the control part of another group of explosion-proof electric heaters, for example Figure 1 In the embodiment shown, the NG inlet 16 and the NG outlet 17 are fixedly arranged at the housing end on the same side as the control portion of the second explosion-proof electric heater 15;

[0036] Further, in order to obtain better heat exchange efficiency and balanced structure layout, the high-temperature heat source heat exchange pipe 11 and the NG heat exchange pipe 12 in the horizontal cylinder 1 will have the heating rod parts of the two sets of explosion-proof electric heaters in the internal region, and the high-temperature heat source heat exchange pipe 11 is between the heating rod parts and the NG heat exchange pipe 12.

[0037] Preferably, the NG heat exchange pipe 12 in the horizontal cylinder 1 adopts a spiral coil structure, and the heating rod parts of the two sets of explosion-proof electric heaters are surrounded in the middle region.

[0038] Alternatively, preferably, the high-temperature heat source heat exchange pipe 11 and the NG heat exchange pipe 12 in the horizontal cylinder 1 both adopt a spiral coil structure, and the heating rod parts of the two sets of explosion-proof electric heaters are surrounded in the middle region, that is, the heating rod parts of the two sets of explosion-proof electric heaters are located in the central region, the high-temperature heat source heat exchange pipe 11 is located in the middle layer, and the NG heat exchange pipe 12 is located in the outermost layer.

[0039] It should be noted that the high-temperature heat source inlet 8 and the high-temperature heat source outlet 10 can be located above and below the control part of the explosion-proof electric heater respectively, or on the horizontal sides; although Figure 1 The above and below positions are shown for the purpose of clear display and saving the number of drawings, and the preferred layout is to arrange the two pipe openings on the horizontal sides of the control part of the explosion-proof electric heater, which is convenient for installing the pipe joints and can also avoid the liquid dropped from the pipe joints from falling on the control part. The two pipe openings (the NG inlet 16 and the NG outlet 17) of the NG heat exchange pipe are not described again.

[0040] The horizontal cylinder 1 is respectively provided with a water filling valve (not shown in the figure) for filling the heat exchange liquid and a drain valve 14 for discharging the heat exchange liquid.

[0041] Further, the horizontal cylinder 1 is also provided with

[0042] an exhaust valve 2 which can automatically reduce the pressure to a safe value through the exhaust valve 2 when the pressure in the horizontal cylinder 1 rises to a threshold value;

[0043] a liquid level meter 3 which measures and displays the liquid level information of the heat exchange liquid in the horizontal cylinder 1 through the part extending into the horizontal cylinder 1;

[0044] a first thermometer 5 which measures and displays the liquid temperature information of the heat exchange liquid in the horizontal cylinder 1 through the part extending into the horizontal cylinder 1;

[0045] a liquid level switch 4 (liquid level sensor) which is located at the corresponding lowest liquid level in the horizontal cylinder 1 without affecting the heat exchange work and is electrically connected to the control circuit 18 outside the cylinder through a cable (combined with Figure 2a liquid level switch (shown in Fig. 1) for detecting whether the liquid level is below the minimum working level;

[0046] a temperature transmitter 6 for detecting the temperature of the heat exchange liquid in the horizontal cylinder 1 and electrically connected to the control circuit 18 outside the cylinder through a cable to transmit the detected temperature signal to the control circuit 18;

[0047] The control circuit 18 is also electrically connected to control the first and second explosion-proof electric heaters 9 and 15, respectively.

[0048] Preferably, a second temperature gauge 7 is also arranged and connected to the pipeline at the high-temperature heat source inlet 8 for detecting and displaying the temperature of the high-temperature heat source medium entering the high-temperature heat source inlet 8.

[0049] Preferably, a flow control valve 8-1 is also arranged and connected to the pipeline at the high-temperature heat source inlet 8 and electrically connected to the control circuit 18 for controlling the flow of the high-temperature heat source medium entering the high-temperature heat source inlet 8.

[0050] Working principle:

[0051] The two heating systems of the utility model have three working modes to choose from, i.e., both systems work simultaneously or only one of them works, preferably, the heat source system using the high-temperature heat source owned by the station is recommended, so as to minimize energy consumption.

[0052] Heat source system heating: the high-temperature heat source flows into the high-temperature heat source heat exchange pipe 11 from the high-temperature heat source inlet 8, exchanges and heats the heat exchange liquid in the horizontal cylinder 1 through the heat exchange pipe 11, and raises the liquid temperature to 60±2.5℃. The temperature value of the high-temperature heat source can be observed through the second temperature gauge 7, and the liquid temperature and level of the heat exchange liquid in the cylinder can also be observed through the liquid level meter 3 and the first temperature gauge 5.

[0053] Electric heating system heating: the first and second explosion-proof electric heaters 9 and 15 start working simultaneously under the control of the control circuit 18, and raise the liquid temperature of the heat exchange liquid in the cylinder to 60±2.5℃; the temperature transmitter 6 detects the temperature of the heat exchange liquid and transmits the liquid temperature signal to the control circuit 18, which automatically controls the start and stop of the first and second explosion-proof electric heaters to prevent the heat source system from failing or being insufficiently heated, and the electric heating system can be used to supplement or replace the heat source system.

[0054] When the liquid level in the cylinder is below the minimum safe level, the liquid level switch 4 judges and transmits the judgment signal to the control circuit 18, which controls the first and second explosion-proof electric heaters 9 and 15 electrically connected to stop heating work.

[0055] At the same time, the liquid temperature and level in the horizontal cylinder 1 can also be observed through the liquid level meter 3 and the first temperature gauge 5.

[0056] When the pressure in the horizontal cylinder 1 rises above a threshold value, the pressure is reduced to a safe value by the exhaust valve 2.

[0057] NG heat exchange: when the liquid temperature in the device reaches a preset value of 60±2.5℃, natural gas flows in from the NG inlet 16, and the natural gas indirectly obtains heat from the heat exchange liquid through the NG heat exchange pipe 12, so that the natural gas is heated to a predetermined value, and the natural gas heating is completed or flows into the downstream pipe network through the NG outlet 17.

[0058] The circuit structure of the control circuit and the control strategy described above belong to the prior art known to those skilled in the art, and will not be described herein.

[0059] The above only describes the preferred embodiments of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A dual system heat exchange device for natural gas pressure regulating station, characterized in that, The application relates to a horizontal cylinder with a horizontal axis, which is sealed and filled with heat exchange liquid; two groups of explosion-proof electric heaters are arranged in the horizontal cylinder, and the control parts of the two groups of explosion-proof electric heaters are arranged outside the two ends of the shell in the axial direction of the horizontal cylinder; the heating rod parts of the two groups of explosion-proof electric heaters penetrate into the horizontal cylinder and extend horizontally along the axial direction, and the ends of the heating rod parts of the two groups of explosion-proof electric heaters extend to each other with a horizontal gap. High-temperature heat source heat exchange pipes and NG heat exchange pipes are arranged in the horizontal cylinder; the two pipe openings of the high-temperature heat source heat exchange pipes are arranged at the shell end on the same side of the control part of one group of explosion-proof electric heaters; and the two pipe openings of the NG heat exchange pipes are arranged at the shell end on the same side of the control part of the other group of explosion-proof electric heaters. The high-temperature heat source heat exchange pipes and the NG heat exchange pipes are arranged in the internal region of the heating rod parts of the two groups of explosion-proof electric heaters, and the high-temperature heat source heat exchange pipes are arranged between the heating rod parts and the NG heat exchange pipes. The application further comprises a liquid level switch which is arranged at the lowest working liquid level in the horizontal cylinder and is electrically connected to the control circuit outside the cylinder through a cable, and is used for detecting whether the liquid level is lower than the lowest working liquid level and transmitting a signal to the control circuit. A temperature transmitter is used for detecting the liquid temperature of the heat exchange liquid in the horizontal cylinder and is electrically connected to the control circuit through a cable, and transmits the detected liquid temperature signal to the control circuit. The control circuit is electrically connected to control the two groups of explosion-proof electric heaters. The NG heat exchange pipes adopt a spiral coil structure and surround the middle region of the heating rod parts of the two groups of explosion-proof electric heaters; or the high-temperature heat source heat exchange pipes and the NG heat exchange pipes both adopt a spiral coil structure and jointly surround the middle region of the heating rod parts of the two groups of explosion-proof electric heaters, that is, the heating rod parts of the two groups of explosion-proof electric heaters are arranged in the central region, the high-temperature heat source heat exchange pipes are arranged in the middle layer, and the NG heat exchange pipes are arranged in the outermost layer.

2. The dual system heat exchange device for natural gas pressure regulating station according to claim 1, characterized in that, The two pipe openings of the high-temperature heat source heat exchange pipes and the NG heat exchange pipes are arranged on the two sides of the control part of the explosion-proof electric heater in the horizontal direction.

3. The dual system heat exchange device for natural gas pressure regulating station according to claim 1, characterized in that, The horizontal cylinder is further provided with 4. The dual system heat exchange device for natural gas pressure regulating station according to claim 1, characterized in that, an exhaust valve which can automatically reduce the pressure to a safe value through the exhaust valve when the pressure in the horizontal cylinder rises to a threshold value; a liquid level meter which measures and displays the liquid level information of the heat exchange liquid in the horizontal cylinder through the part extending into the horizontal cylinder; a first temperature meter which measures and displays the liquid temperature information of the heat exchange liquid in the horizontal cylinder through the part extending into the horizontal cylinder. A second temperature meter is further connected to the pipeline at the high-temperature heat source inlet and is used for detecting and displaying the temperature of the high-temperature heat source medium input into the high-temperature heat source inlet.

5. The dual system heat exchange device for natural gas pressure regulating station according to claim 1, characterized in that, A flow control valve is further arranged on the pipeline at the high-temperature heat source inlet and is electrically connected to the control circuit and is used for controlling the flow of the high-temperature heat source medium input into the high-temperature heat source inlet.

6. The dual system heat exchange device for natural gas pressure regulating station according to claim 1, characterized in that, The peripheral part of the heating rod part of each group of explosion-proof electric heaters in the radial direction of the horizontal cylinder is arranged with an annular gap between the peripheral part and the inner wall of the horizontal cylinder.

7. The dual system heat exchange device for natural gas pressure regulating station according to claim 1, characterized in that, ​

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