Natural gas pressure regulating device

Abstract

The utility model discloses a natural gas pressure regulating device which comprises a gas inlet pipe, a gas outlet pipe and a pressure regulating module. The gas inlet pipe is connected with a natural gas output pipeline through a flange plate at the end, the gas outlet pipe is connected with a natural gas long-distance pipeline through a flange plate at the end, and the pressure regulating module is arranged between the gas inlet pipe and the gas outlet pipe. The pressure adjusting module comprises a pressure adjusting pipeline, a first adjusting valve, a second adjusting valve and a third adjusting valve are installed on the pressure adjusting pipeline in parallel, and the pressure of natural gas is accurately adjusted through a three-stage pressure adjusting structure. Through cooperative work of different adjusting valves, the pressure is adjusted in time, the risk of device faults caused by parameter fluctuation is reduced, gas supply interruption or pressure out-of-control is avoided, safety and stability of urban gas supply are guaranteed, and potential safety hazards are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to natural gas conveying related technical field, concretely is natural gas pressure regulating device. BACKGROUND

[0002] In the natural gas long -distance pipeline system, the door station as the key node connecting long -distance trunk line and city gas distribution pipe network needs to reduce high pressure (usually 4-10MPa) natural gas to medium pressure (0.3-1.6MPa) or low pressure (<0.1MPa) to meet downstream user demand.

[0003] The existing natural gas pressure regulating device has many problems when being applied to the door station pressure regulation of long -distance pipeline pressure level system, on the one hand, the pressure regulating precision is difficult to meet the increasingly strict gas supply requirement, and the pressure fluctuation is big, influences the normal operation and service life of downstream gas equipment, on the other hand, the stability and reliability of pressure regulating device are insufficient, when facing the big fluctuation of natural gas flow, pressure and other parameters, easy to appear the fault, leads to gas supply interruption or pressure out of control, brings the security risk to city gas supply, therefore we need to propose natural gas pressure regulating device. UTILITY MODEL CONTENT

[0004] The utility model discloses a natural gas pressure regulating device, through the cooperative work of different regulating valves, timely pressure adjustment reduces the risk of device failure caused by parameter fluctuation, avoids gas supply interruption or pressure out of control, guarantees the safe and stable of city gas supply, reduces the security risk, to solve the problem in the background art.

[0005] To achieve the above object, the utility model provides the following technical scheme:

[0006] Natural gas pressure regulating device, comprising:

[0007] Gas inlet pipe, gas outlet pipe and pressure regulating module;

[0008] The gas inlet pipe is connected with natural gas output pipeline through the flange disc at the end, the gas outlet pipe is connected with natural gas long -distance pipeline through the flange disc at the end, and the pressure regulating module is arranged between the gas inlet pipe and the gas outlet pipe;

[0009] The pressure regulating module comprises a pressure regulating pipeline, a first regulating valve, a second regulating valve and a third regulating valve are installed in parallel on the pressure regulating pipeline, and natural gas is accurately regulated through a three -level pressure regulating structure.

[0010] Preferably, the first regulating valve adopts a shaft flow design, a porous cage sleeve is arranged in the valve body, and the inlet pressure of 4-10 MPa can be initially regulated to 1.5-3 MPa; the second regulating valve adopts a pilot type structure, the valve core position is controlled through a diaphragm feedback, and the pressure is accurately regulated to 0.5-1.6 MPa; the third regulating valve adopts a self-type pressure stabilizing structure, and the pressure is finely adjusted to ensure that the outlet pressure fluctuation is not more than ±0.03 MPa.

[0011] Preferably, the filter module is arranged between the air inlet pipe and the pressure regulating module, the filter module comprises a filter pipe, a filter core is arranged in the filter pipe, the filter core comprises an inner layer and an outer layer, the inner layer is a metal sintered filter core with a precision of 5 microns, and the outer layer is a fiber filter core with a precision of 1 micron.

[0012] Preferably, the end of the air inlet pipe is provided with a fixing disc, the open end of the filter pipe is provided with a surrounding edge, and the surrounding edge and the fixing disc are fixed together through fixing screws; after the fixing screws are removed, the filter core can be cleaned or replaced.

[0013] Preferably, the detection mechanism for monitoring the transmitted natural gas is further arranged between the pressure regulating module and the air outlet pipe, and the detection module comprises a detection pipe, a temperature sensor, a flow sensor and a pressure sensor are sequentially arranged on the detection pipe.

[0014] Preferably, a hoop is arranged on the pressure regulating pipe, a support is arranged on one side of the hoop, and a control panel is arranged on the support; the control panel is integrated with a PLC controller and a display screen; the temperature sensor, the flow sensor and the pressure sensor are signal connected to the control panel, and the temperature value, the flow value and the pressure value can be directly displayed on the display screen.

[0015] Compared with the prior art, the utility model has the advantages that:

[0016] 1. The three-stage pressure regulating structure is adopted, the first regulating valve, the second regulating valve and the third regulating valve cooperate with each other, and the pressure is accurately controlled in layers. The first regulating valve initially regulates the inlet pressure, and lays a foundation for subsequent pressure regulation; the second regulating valve realizes high-precision pressure regulation by using a pilot type structure and a diaphragm feedback control, and the pressure regulation precision reaches ±0.5%; the third regulating valve finely adjusts the pressure by adopting a self-type pressure stabilizing structure, and ensures that the outlet pressure fluctuation is not more than ±0.03 MPa, thereby meeting the increasingly strict gas supply requirements, providing stable pressure for downstream gas equipment, and prolonging the service life of the equipment.

[0017] 2. Enhance the stability and reliability of the device: the three-stage pressure regulating structure can effectively respond to the large fluctuations of natural gas flow, pressure and other parameters. The regulating valves at each stage are designed for different pressure ranges and adjustment requirements. When the inlet pressure or flow changes, the pressure is adjusted in time through the coordinated work of different regulating valves, reducing the risk of device failure caused by parameter fluctuations, avoiding gas supply interruption or pressure loss of control, ensuring the safety and stability of urban gas supply, and reducing safety hazards.

[0018] 3. Optimize the efficiency of pressure regulation: the three-stage regulating valve installed in parallel can flexibly adjust the opening combination and adjustment force according to the actual working condition, realizing rapid response and efficient regulation of natural gas pressure. Compared with a single pressure regulating structure, it can adjust the pressure to the target value in a shorter time, improve the overall pressure regulating efficiency, and adapt to the complex and variable working condition requirements in the pressure regulating process of long pipeline stations. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the utility model;

[0020] Figure 2 It is a structural schematic diagram of the filter element of the utility model;

[0021] Figure 3 It is a structural schematic diagram of the control panel of the utility model.

[0022] In the figure: 1, inlet pipe; 2, outlet pipe; 3, filter module;

[0023] 4, pressure regulating module; 401, first regulating valve; 402, second regulating valve; 403, third regulating valve;

[0024] 5, control panel; 6, hoop; 7, temperature sensor; 8, flow sensor; 9, pressure sensor;

[0025] 10, filter element; 1001, outer layer; 1002, inner layer;

[0026] 11, surrounding edge; 12, fixed disc. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0028] Please refer to Figure 1The utility model provides a natural gas pressure regulating device, including intake pipe 1, outlet pipe 2 and pressure regulating module 4, intake pipe 1 is connected natural gas output pipeline through the flange disc of end part, outlet pipe 2 is connected natural gas long transmission pipeline through the flange disc of end part, and pressure regulating module 4 is arranged between intake pipe 1 and outlet pipe 2.

[0029] Pressure regulating module 4 includes pressure regulating pipeline, and first regulating valve 401, second regulating valve 402 and third regulating valve 403 are installed in parallel on pressure regulating pipeline, and natural gas is accurately regulated through three-stage pressure regulating structure. First regulating valve 401 adopts axial flow type design, and the valve body is built-in porous cage type sleeve, can be 4-10MPa's inlet pressure is initially regulated to 1.5-3MPa;Second regulating valve 402 adopts pilot type structure, and the valve core position is controlled through diaphragm feedback, and the pressure is accurately regulated to 0.5-1.6MPa, and the pressure regulating accuracy can reach ±0.5%;Third regulating valve 403 adopts self force type pressure stabilizing structure, and the pressure is fine tuned, and it is ensured that outlet pressure fluctuation is not more than ±0.03MPa.

[0030] When using, intake pipe 1 is connected with natural gas output pipeline through flange disc, and high-pressure natural gas is introduced into the device;Outlet pipe 2 is connected with natural gas long transmission pipeline through flange disc, and the natural gas after pressure regulating is output. The first, second and third regulating valves are connected in parallel on the pressure regulating pipeline in the pressure regulating module 4, the first regulating valve 401 (axial flow type, porous cage type sleeve) is first reduced to 1.5-3MPa from 4-10MPa's inlet pressure, which creates conditions for subsequent pressure regulation;Second regulating valve 402 (pilot type, diaphragm feedback) further accurately regulates the pressure to 0.5-1.6MPa;Third regulating valve 403 (self force type pressure stabilizing) is fine tuned to ensure that the outlet pressure fluctuation is within ±0.03MPa.

[0031] Overall, three-stage pressure regulating structure is adopted, and the first regulating valve 401, the second regulating valve 402 and the third regulating valve 403 work together to control the pressure layer by layer. The first regulating valve 401 initially regulates the inlet pressure to lay a foundation for subsequent pressure regulation;Second regulating valve 402 realizes high-precision pressure regulation by using pilot type structure and diaphragm feedback control, and the pressure regulating accuracy reaches ±0.5%;Third regulating valve 403 adopts self force type pressure stabilizing structure to fine tune the pressure, ensuring that the outlet pressure fluctuation is not more than ±0.03MPa, meeting the increasingly stringent gas supply requirements, providing stable pressure for downstream gas equipment, and prolonging the service life of the equipment;Three-stage pressure regulating structure can effectively cope with the large fluctuations of natural gas flow, pressure and other parameters. The regulating valves of different levels are designed according to different pressure ranges and regulation requirements. When the inlet pressure or flow changes, the pressure is adjusted in time through the cooperative work of different regulating valves, the risk of device failure caused by parameter fluctuation is reduced, the gas supply interruption or pressure out of control is avoided, the safety and stability of urban gas supply are ensured, and the security risks are reduced.

[0032] The first regulating valve 401 adopts Fisher DVC6200H type axial flow high pressure regulating valve, and specific parameters are as follows: nominal diameter: DN100-DN200 (selected according to flow); pressure class: Class900-Class2500; maximum inlet pressure: 10MPa; outlet pressure range: 1.5-3MPa; flow coefficient: KV value 100-500; adjustable ratio: 100:1; valve core structure: balanced cage sleeve structure, sleeve opening rate 35%, aperture 2-3mm, multi-stage throttling design is adopted to reduce fluid velocity, reduce noise and vibration; material: valve body profile is WC6 cast steel, valve core and valve seat are 17-4PH stainless steel, surface hardening treatment is to HRC58-62; actuator: pneumatic diaphragm actuator, spring range 20-100kPa, with hand wheel operating mechanism; control mode: accepts 4-20mA signal control, with Fisher DVC6200H digital valve positioner, supports HART protocol; leakage level: meets ANSI / FCI70-2IV level standard; noise level: ≤85dB(A) (at rated flow and differential pressure);

[0033] The second regulating valve 402 adopts SAMSON3271 type pilot type precision pressure regulating valve, and specific parameters are as follows: nominal diameter: DN80-DN150; pressure class: Class600-Class1500; maximum inlet pressure: 4MPa; outlet pressure range: 0.5-1.6MPa; flow coefficient: KV value 80-320; pressure regulating accuracy: ±0.5%; response time: ≤0.3 seconds (when step changes); valve core structure: balanced plunger valve core with pilot control cavity, and the pilot valve adopts stainless steel diaphragm structure; material: valve body is WCB cast steel, valve core and valve seat are 316 stainless steel, and the pilot valve diaphragm is hastelloy C-276; actuator: hydraulic actuator with pressure feedback control; control mode: accepts 4-20mA signal control, built-in PID controller, which can realize remote setting and automatic adjustment; stability: when the flow changes ±50%, the outlet pressure fluctuation is ≤±0.02MPa; temperature range: -20℃-80℃.

[0034] The third regulating valve 403 adopts TYCO Z600 type self-force type pressure stabilizing valve, and specific parameters are as follows: nominal diameter: DN65-DN125; pressure class: Class300-Class600; maximum inlet pressure: 2MPa; outlet pressure range: 0.3-1.0MPa; pressure stabilizing accuracy: ±0.03MPa; flow coefficient: KV value 50-200; valve core structure: flexible rubber diaphragm combined with balanced valve core, diaphragm effective area ≥100cm 2Material: the valve body is nodular cast iron (QT450-10), the valve core is brass plated with nickel, and the diaphragm is nitrile rubber sandwich fabric; Control mode: pure self-powered control, no external energy source, directly drive the valve core action through the outlet pressure; Pressure characteristic: when the inlet pressure changes ±0.5MPa, the outlet pressure changes ≤±0.01MPa; Closing characteristic: when the outlet pressure exceeds the set value by 10%, the valve is tightly closed, and the leakage is ≤0.1% of the rated flow; Temperature range: -10℃-60℃.

[0035] Please refer to Figures 1-2 :

[0036] Further comprising a filter module 3 arranged between the air inlet pipe 1 and the pressure regulating module 4, the filter module 3 comprises a filter pipe, the filter pipe is internally provided with a filter core 10, the filter core 10 comprises an inner layer 1002 and an outer layer 1001, the inner layer 1002 is a metal sintered filter core 10 with a precision of 5 μm, and the outer layer 1001 is a fiber filter core 10 with a precision of 1 μm. The end of the air inlet pipe 1 is provided with a fixing disc 12, and the opening end of the filter pipe is provided with a surrounding edge 11, the surrounding edge 11 and the fixing disc 12 are fixed together through fixing screws, and the filter core 10 can be cleaned or replaced after the fixing screws are removed.

[0037] In use, the natural gas flows through the filter pipe before entering the pressure regulating module 4, and sequentially passes through the outer layer 1001 fiber filter core 10 with a precision of 1 μm and the inner layer 1002 metal sintered filter core 10 with a precision of 5 μm, the fiber filter core 10 intercepts smaller particle impurities, and the metal sintered filter core 10 blocks larger particles, so that the natural gas is double-filtered and purified. The surrounding edge 11 of the filter pipe and the fixing disc 12 at the end of the air inlet pipe 1 are connected through fixing screws, and when the filter core 10 needs to be cleaned or replaced, the screws can be unscrewed for disassembly.

[0038] Such design can effectively filter solid impurities and liquid droplets in the natural gas, avoid impurities from entering the pressure regulating module 4, prevent valve core wear and tear and pipeline blockage and the like faults, improve the stability and reliability of the pressure regulating device, and prolong the service life of the equipment.

[0039] Please refer to Figure 1 and 3 :

[0040] The utility model further includes a detection mechanism for monitoring the transmitted natural gas, a monitoring module is arranged between the pressure regulating module 4 and the air outlet pipe 2, the monitoring module comprises a monitoring pipe, and a temperature sensor 7, a flow sensor 8 and a pressure sensor 9 are sequentially installed on the monitoring pipe. A clamp 6 is arranged on the pressure regulating pipe, a support is arranged on one side of the clamp 6, a control panel 5 is installed on the support, the control panel 5 is integrated with a PLC controller and a display screen, the temperature sensor 7, the flow sensor 8 and the pressure sensor 9 are signal connected to the control panel 5, and temperature values, flow values and pressure values can be directly displayed through the display screen.

[0041] In use, the natural gas enters the monitoring pipeline after being regulated by the regulating module 4, and the temperature sensor 7, the flow sensor 8 and the pressure sensor 9 on the pipeline detect the temperature, flow and pressure parameters of the natural gas in real time, and transmit the data in the form of electrical signals to the PLC controller of the control panel 5. After the PLC controller processes the data, the relevant values are displayed intuitively on the display screen, and the operating personnel can judge the running state of the regulating device according to the values, and adjust the device through the control panel 5 if necessary.

[0042] The real-time monitoring of the key parameters of the natural gas during the regulating process can be realized, the operating personnel can master the running state of the device in time, and the abnormality can be found and handled in time, so that the stable and reliable running of the regulating device is ensured, and the safety of the city gas supply is ensured.

[0043] The control panel 5 adopts a programmable logic controller (PLC) or a distributed control system (DCS) and has powerful data processing and control functions. The controller receives the signals transmitted by the pressure sensor 9 and the flow sensor 8, calculates the opening required by the regulating valve according to the preset regulating strategy and algorithm, and sends control instructions to the switching valve and the regulating valve of the regulating unit; at the same time, the controller also has data storage, fault diagnosis and remote communication functions, can record the running data of the regulating device, monitor and diagnose the running state of the device in real time, and upload the related information to the remote monitoring center.

[0044] The control panel 5 also has an alarm function, including a loudspeaker, a warning light and a remote communication alarm. When the pressure, flow and other parameters of the natural gas are monitored to be out of the set range, or the regulating device fails, the alarm device can timely send an audible and light alarm signal, and the staff can remotely send an alarm information, reminding the operating personnel to take corresponding measures. The alarm threshold of the alarm device can be flexibly set according to the actual running condition, so that the alarm can be timely sent when the abnormal condition occurs.

[0045] The control mode of the control panel 5 of the present application is controlled by the built-in PLC controller, and the control circuit of the PLC controller can be realized by simple programming by those skilled in the art, which belongs to the common knowledge in the art, and the present application file is mainly used to protect the mechanical device, so the control mode and the circuit connection will not be explained in detail.

[0046] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A natural gas pressure regulating device, characterized in that, include: Inlet pipe (1), outlet pipe (2) and pressure regulating module (4); The inlet pipe (1) is connected to the natural gas output pipeline through the flange at the end, and the outlet pipe (2) is connected to the long-distance natural gas pipeline through the flange at the end. The pressure regulating module (4) is set between the inlet pipe (1) and the outlet pipe (2). The pressure regulating module (4) includes a pressure regulating pipeline, on which a first regulating valve (401), a second regulating valve (402) and a third regulating valve (403) are installed in parallel. The natural gas is precisely regulated through the three-stage pressure regulating structure.

2. The natural gas pressure regulating device according to claim 1, characterized in that: The first regulating valve (401) adopts an axial flow design with a built-in porous cage sleeve in the valve body, which can initially adjust the inlet pressure from 4-10MPa to 1.5-3MPa; the second regulating valve (402) adopts a pilot-operated structure, which controls the valve core position through diaphragm feedback, and accurately adjusts the pressure to 0.5-1.6MPa; the third regulating valve (403) adopts a self-regulating pressure stabilizing structure, which finely adjusts the pressure to ensure that the outlet pressure fluctuation does not exceed ±0.03MPa.

3. The natural gas pressure regulating device according to claim 1, characterized in that: It also includes a filter module (3) disposed between the air intake pipe (1) and the pressure regulating module (4). The filter module (3) includes a filter pipe and a filter element (10) is disposed inside the filter pipe. The filter element (10) includes an inner layer (1002) and an outer layer (1001). The inner layer (1002) is a metal sintered filter element (10) with a precision of 5μm, and the outer layer (1001) is a fiber filter element (10) with a precision of 1μm.

4. The natural gas pressure regulating device according to claim 3, characterized in that: The end of the air intake pipe (1) is provided with a fixing plate (12), and the opening end of the filter pipe is provided with a rim (11). The rim (11) and the fixing plate (12) are fixed together by fixing screws. After removing the fixing screws, the filter element (10) can be cleaned or replaced.

5. The natural gas pressure regulating device according to claim 1, characterized in that: It also includes a detection mechanism for monitoring the transmitted natural gas. The monitoring module is set between the pressure regulating module (4) and the gas outlet pipe (2). The monitoring module includes a monitoring pipeline, on which a temperature sensor (7), a flow sensor (8) and a pressure sensor (9) are installed in sequence.

6. The natural gas pressure regulating device according to claim 5, characterized in that: The pressure regulating pipe is equipped with a clamp (6), and a bracket is set on one side of the clamp (6). A control panel (5) is installed on the bracket. The control panel integrates a PLC controller and a display screen. The temperature sensor (7), flow sensor (8) and pressure sensor (9) are connected to the control panel. The temperature value, flow value and pressure value can be displayed intuitively through the display screen.

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