Special heating device for compressed natural gas decompression pry

Abstract

The utility model relates to the technical field of natural gas production, in particular to a special heating device for a compressed natural gas decompression pry, and aims to solve the technical problem that waste heat is remained in preheated and decompressed natural gas, and energy waste is inevitably caused by direct discharge of the waste heat. The tail end of the first spiral gas conveying pipe is communicated with a second spiral gas conveying pipe through an elbow, the first spiral gas conveying pipe and the second spiral gas conveying pipe are the same in diameter, screw pitch, spiral starting position and spiral ending position and are connected to the inner wall of the heating chamber, and the upper end of the second spiral gas conveying pipe is communicated with a spiral exhaust pipe through a pressure reducing valve. The spiral exhaust pipe is spirally wound on the gas inlet pipe, the gas conveying pipe is of a double-spiral structure, compared with a single-spiral gas conveying pipe, on the premise that the pipe length is the same, the preheating effect of the double-spiral gas conveying pipe is better than that of the single-spiral gas conveying pipe, and waste heat of natural gas is conducted to the gas inlet pipe outside a medium through the spiral exhaust pipe for preheating and waste heat recovery.

Description

TECHNICAL FIELD

[0001] The utility model relates to natural gas production technical field, and the specific field is special heating device for compressed natural gas decompression pry. BACKGROUND

[0002] In the natural gas transmission and distribution system, the compressed natural gas decompression pry is the key equipment, which is used for reducing the pressure of high-pressure natural gas to the appropriate pressure for downstream use. However, in the process of reducing the pressure of compressed gas, the heat absorption phenomenon will be generated due to the expansion of the gas volume, which is easy to cause the "ice blockage" phenomenon in the decompression valve core part of the pressure regulator. The "ice blockage" will cause the outlet gas pressure to fluctuate, and even cause the decompression system to fail, which affects the safe and stable operation of the entire gas transmission and distribution system, so a special heating device is needed to solve this problem.

[0003] The prior art uses an electric heater to heat the heat exchange medium in the box as a heating device, and then preheats the gas pipeline, which solves the "ice blockage" phenomenon. However, when the single helical gas conveying pipe is used, the natural gas is conveyed slowly along the vertical direction, which causes the temperature difference between the upper and lower layers of the medium, and affects the preheating effect. UTILITY MODEL CONTENTS

[0004] The utility model discloses in order to solve the technical problem that when the single helical gas conveying pipe is used, the natural gas is conveyed slowly along the vertical direction, which causes the temperature difference between the upper and lower layers of the medium, and affects the preheating effect, and further provides a special heating device for compressed natural gas decompression pry.

[0005] To achieve the above object, the utility model provides the following technical scheme: a special heating device for compressed natural gas decompression pry, comprising: a heating chamber, liquid heating medium and electric heating element are arranged in the heating chamber, a top cover is connected to the upper end of the heating chamber, a liquid injection pipe is connected to the top cover, a gas inlet pipe is communicated with a helical gas conveying pipe one, the helical gas conveying pipe one is communicated with a helical gas conveying pipe two through an elbow at the end, the diameter, pitch, helical start and end position of the helical gas conveying pipe one and the helical gas conveying pipe two are all same, the helical gas conveying pipe one and the helical gas conveying pipe two are connected to the inner wall of the heating chamber, the upper end of the helical gas conveying pipe two is communicated with a helical exhaust pipe through a pressure reducing valve, and the helical exhaust pipe is spirally wound on the gas inlet pipe.

[0006] Preferably, the inner wall of the heating chamber is connected with a support, the support is provided with a helical hole, and the helical gas conveying pipe one and the helical gas conveying pipe two can be spirally rotated into the helical hole and gap matched with the helical hole.

[0007] Preferably, the support is made of metal, and the support is provided with an electric heating element.

[0008] Preferably, the bottom wall of the heating chamber in the middle of the helical gas conveying pipe one and the helical gas conveying pipe two is rotationally connected with an agitating shaft, the agitating shaft is connected with an agitating blade, and the agitating shaft is connected with a power source.

[0009] Compared with the prior art, the beneficial effects of this utility model are:

[0010] 1. The gas pipeline adopts a double-helix structure. Compared with the single-helix gas pipeline, under the premise of the same pipeline length, the natural gas in the double-helix gas pipeline can move from the upper layer to the lower layer and then back faster. The temperature of the medium is evenly conducted into the pipeline. When using the single-helix gas pipeline, the natural gas is transported slowly in the vertical direction. Since the flow of the medium also requires time to conduct heat, the temperature of the upper layer medium is low and the temperature of the lower layer medium is high. The heat conduction effect between the lower temperature upper layer medium and the lower temperature natural gas is very poor. The preheating effect of the double-helix gas pipeline is better. After the natural gas is depressurized, the waste heat of the natural gas is conducted to the gas inlet pipe outside the medium through the spiral exhaust pipe for preheating and waste heat recovery, saving energy and improving the preheating effect.

[0011] 2. The double-helix gas pipe can be screwed into the bracket to complete the fixation, which is very convenient to install. The heating element inside the bracket transfers heat to the natural gas through metal conduction, which is more efficient. Attached Figure Description

[0012] Fig. 1 This is a schematic diagram of the structure of this utility model;

[0013] Fig. 2 This is a schematic diagram of the structure of this utility model.

[0014] In the diagram: 1. Heating chamber; 2. Top cover; 3. Liquid injection pipe; 4. Air inlet pipe; 5. Spiral air delivery pipe 1; 6. Elbow; 7. Spiral air delivery pipe 2; 8. Pressure reducing valve; 9. Spiral exhaust pipe; 10. Support; 11. Spiral hole; 12. Stirring shaft; 13. Stirring blade. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] The rotary connection described in this device refers to the axial fixation of the bearing by mounting the bearing on the shaft, with a spring retaining ring groove provided on the shaft or shaft hole, and the rotation achieved by locking the elastic retaining ring in the retaining ring groove; the hinge connection refers to the connection method that allows movement through connecting parts such as hinges, pins, and short shafts.

[0017] The present invention will now be described in detail with reference to the accompanying drawings.

[0018] The following is in conjunction with the appendix Figs. 1-2The special heating device for compressed natural gas decompression pry includes a heating chamber 1, liquid heating medium and an electric heating element arranged in the heating chamber 1, a top cover 2 connected to the upper end of the heating chamber 1, a liquid injection pipe 3 connected to the top cover 2, an air inlet pipe 4 in communication with a spiral gas conveying pipe 1 5, a bend 6 in communication between the end of the spiral gas conveying pipe 1 5 and a spiral gas conveying pipe 2 7, the spiral gas conveying pipe 1 5 and the spiral gas conveying pipe 2 7 having the same diameter, pitch, spiral starting and ending positions, the spiral gas conveying pipe 1 5 and the spiral gas conveying pipe 2 7 being connected to the inner wall of the heating chamber 1, the upper end of the spiral gas conveying pipe 2 7 being in communication with a spiral gas discharging pipe 9 through a pressure reducing valve 8, and the spiral gas discharging pipe 9 being spirally wound on the air inlet pipe 4.

[0019] Natural gas is conveyed and discharged through the air inlet pipe 4, the spiral gas conveying pipe 1 5, the bend 6, the spiral gas conveying pipe 2 7, the pressure reducing valve 8 and the spiral gas discharging pipe 9, and the heat of the electric heating element and the medium is conducted to the natural gas in the gas conveying pipe to complete preheating. The spiral gas conveying pipe 1 5, the bend 6 and the spiral gas conveying pipe 2 7 form a double helix structure. Compared with a single helix gas conveying pipe, the natural gas in the double helix gas conveying pipe can be faster from the upper layer to the lower layer and then return under the premise of the same pipe length. The medium temperature is uniformly conducted to the pipe. When a single helix gas conveying pipe is used, the natural gas is conveyed slowly in the vertical direction. The flow of the medium also needs time to conduct heat, resulting in low temperature of the upper layer medium and high temperature of the lower layer medium. The upper layer medium with low temperature and the natural gas with low temperature have poor heat conduction effect. The preheating effect is better when the double helix gas conveying pipe is used. After the natural gas is decompressed, the waste heat of the natural gas is conducted to the air inlet pipe 4 outside the medium through the spiral gas discharging pipe 9 to preheat and recover waste heat, thereby saving energy and having better preheating effect.

[0020] The inner wall of the heating chamber 1 is connected with a support 10, the support 10 is provided with a spiral hole 1 1, and the spiral gas conveying pipe 1 5 and the spiral gas conveying pipe 2 7 can be spirally rotated into the spiral hole 1 1 and gap matched with the spiral hole 1 1.

[0021] The double helix gas conveying pipe is rotated into the spiral hole 1 1 of the support 10 to be fixed, and the installation is very convenient.

[0022] The support 10 is made of metal, and the support 10 is provided with an electric heating element.

[0023] The electric heating element in the support 10 conducts heat to the natural gas through metal, and the heat conduction efficiency is better.

[0024] A stirring shaft 1 2 is rotationally connected to the bottom wall of the heating chamber 1 in the middle of the spiral gas conveying pipe 1 5 and the spiral gas conveying pipe 2 7, a stirring blade 1 3 is connected to the stirring shaft 1 2, and the stirring shaft 1 2 is connected with a power source.

[0025] The power drives the stirring blade 13 to rotate through the stirring shaft 12, strengthens the flowability of the medium, makes the temperature of each layer of medium consistent, and makes the conduction effect better.

[0026] In the description of the present application, unless otherwise clearly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0027] The standard parts used in the present application can be purchased from the market, and the special-shaped parts can be ordered according to the description and the drawings. The specific connection mode of each part adopts the conventional means such as bolt, rivet and welding in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection mode in the prior art, which will not be described in detail here.

[0028] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A dedicated heating device for compressed natural gas pressure relief skids, including: Heating chamber (1) is provided with liquid heating medium and electric heating element. A top cover (2) is connected to the upper end of heating chamber (1), and a liquid injection pipe (3) is connected to the top cover (2). The features are as follows: the air inlet pipe (4) is connected to the first spiral air supply pipe (5), the end of the first spiral air supply pipe (5) is connected to the second spiral air supply pipe (7) through the elbow (6), the diameter, pitch and spiral start and end positions of the first spiral air supply pipe (5) and the second spiral air supply pipe (7) are the same, the first spiral air supply pipe (5) and the second spiral air supply pipe (7) are connected to the inner wall of the heating chamber (1), the upper end of the second spiral air supply pipe (7) is connected to the spiral exhaust pipe (9) through the pressure reducing valve (8), and the spiral exhaust pipe (9) is spirally coiled on the air inlet pipe (4).

2. The special heating device for compressed natural gas depressurization skids according to claim 1, characterized in that: The heating chamber (1) has a support (10) connected to its inner wall. The support (10) has a spiral hole (11) and the spiral gas pipe one (5) and the spiral gas pipe two (7) can be spirally screwed into the spiral hole (11) and are in clearance fit with the spiral hole (11).

3. The heating device for compressed natural gas depressurization skids according to claim 2, characterized in that: The bracket (10) is made of metal and has an electric heating element inside.

4. The heating device for compressed natural gas depressurization skids according to claim 1, characterized in that: The bottom wall of the heating chamber (1) in the middle of the spiral gas pipe one (5) and the spiral gas pipe two (7) is rotatably connected to the stirring shaft (12), and the stirring blade (13) is connected to the stirring shaft (12). The stirring shaft (12) is connected to the power source.

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