CN112696613A - Anti-freezing and anti-blocking throttling oil nozzle - Google Patents
Anti-freezing and anti-blocking throttling oil nozzle Download PDFInfo
- Publication number
- CN112696613A CN112696613A CN202110217858.3A CN202110217858A CN112696613A CN 112696613 A CN112696613 A CN 112696613A CN 202110217858 A CN202110217858 A CN 202110217858A CN 112696613 A CN112696613 A CN 112696613A
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- Prior art keywords
- inhibitor
- pipeline
- temperature
- electric heater
- choke
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/08—Pipe-line systems for liquids or viscous products
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/08—Pipe-line systems for liquids or viscous products
- F17D1/16—Facilitating the conveyance of liquids or effecting the conveyance of viscous products by modification of their viscosity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
Abstract
The invention relates to an anti-freezing and anti-blocking throttling oil nozzle which comprises a valve body 3, a throttling oil nozzle 2, a pressure detector 5, a temperature detector 6, an electric heater 8, an inhibitor adding box 12, a flowmeter 7, an inhibitor liquid storage box 10 and a computer 9, wherein the throttling oil nozzle 2, the pressure detector 5, the temperature detector 6 and the electric heater 8 are arranged in a pipeline outlet 4 of the throttling oil nozzle 2, the inhibitor adding box 12 is arranged at a pipeline inlet 1 of the throttling oil nozzle 2, the inhibitor adding box is connected with the inhibitor liquid storage box 10 through the flowmeter 7, the inhibitor liquid storage box is provided with a hydrate inhibitor, a liquid level monitor 14 and an indicator lamp 15, the inhibitor liquid storage box and the inhibitor adding box are respectively provided with a gate valve, and the pressure detector, the temperature detector, the electric heater, the flowmeter, the gate valve and the liquid level monitor are all connected with the computer 9. The automatic freezing and plugging prevention device is reasonable in structure, convenient to install and maintain, capable of achieving automatic freezing and plugging prevention and control at the position of the natural gas pipeline oil nozzle, and wide in market application prospect.
Description
Technical Field
The invention belongs to the technical field of prevention and control of gas hydrate in pipe transportation, and particularly relates to a design method of a freezing-blockage-preventing throttling oil nozzle.
Background
Natural gas hydrate is a clathrate crystal compound which stably exists under low-temperature and high-pressure environmental conditions. The natural gas hydrate is frozen and blocked, which means that natural gas hydrates are generated and block pipelines or valves under the conditions of certain moisture content, low temperature and high pressure. Freezing and blocking can not only cause equipment damage and influence the gas transmission efficiency of a gas transmission pipeline, but also cause safety accidents such as pipeline pressure building and the like in serious cases, and high attention is required.
At present, in the practice of measures for preventing and controlling freezing and blocking of natural gas hydrate, there are methods for removing blocking such as a water method and a depressurization method. The water removing method has high cost and great limitation; the depressurization method is a method in which the operating pressure is controlled to be lower than the hydrate formation pressure by controlling the line pressure, but the line pressure cannot be lowered at will in general in order to maintain a certain transport capacity. The heating method can change the temperature of the pipeline and destroy the temperature and pressure conditions for generating the hydrate, and is the most direct and effective prevention and control means for preventing and controlling the generation of the hydrate. The addition of the inhibitor is proved to be an effective method for preventing and controlling the natural gas hydrate and is widely applied worldwide, but the time for adding the inhibitor is difficult to judge, and the injection cost of the inhibitor with large dose is high. The actual accidents of the current blockage of a plurality of natural gas hydrates in pipe transportation are analyzed, and the points which are most likely to cause the blockage of the hydrates are often concentrated at the throttling oil nozzle with large change of the flow rate, because the temperature in the pipeline is rapidly reduced and the pressure is increased due to the Joule-Thomson effect after the throttling of the oil nozzle valve, the temperature and pressure conditions meet the formation conditions of the hydrates, and then the positions of the throttling position, the flow direction change and the like can be caused to form ice blockage bodies. Therefore, the anti-freezing and anti-blocking throttling oil nozzle with low energy consumption, high economic benefit and strong pertinence needs to be designed urgently.
Disclosure of Invention
The invention aims to provide a freezing and blocking prevention throttling oil nozzle, which aims at solving the problem that the pipeline is blocked by generating hydrate after a natural gas pipeline passes through a throttling valve, so that the possibility of pipeline freezing and blocking is greatly reduced, and automatic freezing and blocking prevention and control at the natural gas pipeline oil nozzle are realized. The invention has reasonable structure, simple device, convenient installation and maintenance, reduced manual operation, cost saving and wide market application prospect.
In order to achieve the technical purpose, the invention adopts the following technical scheme.
The temperature and pressure detection device detects the temperature and pressure state in the pipeline, the central control system judges whether the position has the hydrate generation risk, and when the temperature and pressure condition of hydrate generation is achieved in the pipeline, the freezing blockage is prevented by an effective means of automatically adding a hydrate inhibitor and electrically heating.
The utility model provides a throttle glib that prevents frostbite and block up, includes the valve body, is arranged in throttle glib talker, pressure measurement appearance, temperature measurement appearance, electric heater, inhibitor of valve body and adds case, flowmeter, inhibitor liquid reserve tank and computer, pressure measurement appearance, temperature measurement appearance and electric heater set up the pipeline export at throttle glib talker, the inhibitor adds the case and sets up the pipeline entry at throttle glib talker, and the inhibitor adds the case and connects the inhibitor liquid reserve tank through the flowmeter, and the inhibitor liquid reserve tank is equipped with the hydrate inhibitor to be equipped with liquid level monitoring meter and pilot lamp, the gate valve is all installed to inhibitor interpolation case and inhibitor liquid reserve tank, pressure measurement appearance, temperature measurement appearance, electric heater, flowmeter, gate valve and liquid level monitoring meter all connect the computer.
The pressure detector and the temperature detector are arranged at the outlet of the throttled pipeline, and the packing seal is arranged at the installation position to ensure the tightness of the pipeline.
The pressure detector and the temperature detector monitor the temperature and the pressure in the pipeline in real time and transmit data to the computer, and the computer analyzes the temperature and pressure data in the pipeline by combining the phase equilibrium curve of the natural gas hydrate and judges whether the temperature and pressure conditions generated by the hydrate in the pipeline are met.
The electric heater is arranged at the outlet of the throttled pipeline and is tightly attached to the pipe wall.
The computer is connected with the electric heater and controls the starting and the closing of the electric heater, the starting time and the power.
The computer is connected with the flow meter and the gate valve, can control the opening and closing of the inhibitor adding tank and the inhibitor liquid storage tank, and meters the dosage of the inhibitor.
The inhibitor liquid storage tank is used for storing the compound hydrate inhibitor (the proportion of the compound hydrate inhibitor can be adjusted according to specific working conditions in the implementation process), a gate valve is arranged at an outlet to control the addition of the inhibitor, and a flow meter controls the dosage of the inhibitor.
The inhibitor liquid storage tank is provided with a liquid level monitoring meter and an indicator lamp and is used for monitoring the liquid level of the inhibitor, and when the liquid level monitoring meter monitors that the content of the inhibitor in the liquid storage tank is less than 30%, the indicator lamp is turned on to prompt that the storage amount of the inhibitor is insufficient.
According to the invention, after the temperature detector and the pressure detector detect that the temperature and pressure conditions reach the hydrate generation conditions, the electric heater and the inhibitor adding box automatically start to work, the electric heater performs freezing blockage prevention and control in a pipeline heating mode, the inhibitor storing box is provided with the prepared compound hydrate inhibitor, and the inhibitor adding box performs freezing blockage prevention and control in a pipeline adding inhibitor adding mode.
When the temperature detector and the pressure detector detect that the temperature and pressure condition reaches the generation condition of the hydrate, the gate valve at the outlet of the inhibitor liquid storage box is automatically opened, the inhibitor is injected into the adding box from the liquid storage box, the flow meter detects the flow of the inhibitor, the gate valve is closed after the inhibitor flows into the agent with fixed amount, at the moment, the gate valve at the outlet of the inhibitor adding box is opened, and by utilizing the Venturi principle, the gate valve at the outlet of the inhibitor adding box is closed after the inhibitor is sucked.
The computer can control the electric heater and the inhibitor liquid storage tank to work simultaneously or independently.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention adopts a plurality of effective prevention and control means to greatly reduce the freezing and blocking possibility at the throttling oil nozzle;
(2) according to the invention, whether an inhibitor is added or not is judged by monitoring the temperature and pressure conditions in the pipeline in real time, and electric heating is carried out, so that automatic anti-freezing and anti-blocking at the throttling oil nozzle are realized, and manual operation is reduced;
(3) according to the invention, the hydrate inhibitor is added and the pipeline is electrically heated at a high risk moment of hydrate generation, so that the consumption of the inhibitor is saved, and the cost is saved;
(4) the device is simple, convenient to install and maintain, high in universality and applicable to other fields with hydrate throttling and freezing blockage.
Drawings
Fig. 1 is a design schematic diagram of a frost-blockage prevention throttling oil nozzle.
Fig. 2 is a schematic structural diagram of a throttling oil nozzle for preventing freezing blockage.
In the figure: 1-an inlet; 2-a throttling oil nozzle; 3-a valve body; 4-an outlet; 5-a pressure detector; 6-temperature detector; 7-a flow meter; 8-an electric heater; 9-a computer; 10-an inhibitor reservoir; 11-gate valve A; 12-inhibitor addition tank; 13-gate valve B; 14-a liquid level monitor meter; 15-indicator light.
Detailed Description
The present invention is further described below with reference to the accompanying drawings so as to facilitate understanding of the present invention by those skilled in the art. It is to be understood that the invention is not limited in scope to the specific embodiments, but is intended to cover various modifications within the spirit and scope of the invention as defined and defined by the appended claims, as would be apparent to one of ordinary skill in the art.
See fig. 1, 2.
An anti-freezing and anti-blocking throttling oil nozzle comprises a valve body 3, a throttling oil nozzle 2 positioned in the valve body, a pressure detector 5, a temperature detector 6, an electric heater 8, an inhibitor adding box 12, a flowmeter 7, an inhibitor liquid storage box 10 and a computer 9, the pressure detector 5, the temperature detector 6 and the electric heater 8 are arranged at the pipeline outlet 4 of the throttling oil nozzle 2, the inhibitor adding tank 12 is arranged at the pipeline inlet 1 of the throttling oil nozzle 2, the inhibitor adding tank is connected with the inhibitor liquid storage tank 10 through a flowmeter 7, the inhibitor liquid storage tank is filled with hydrate inhibitor, a liquid level monitoring meter 14 and an indicator light 15 are arranged, a gate valve A11 and a gate valve B13 are respectively arranged on the inhibitor liquid storage tank and the inhibitor adding tank, the pressure detector, the temperature detector, the electric heater, the flowmeter, the gate valve A, the gate valve B and the liquid level monitor are all connected with the computer 9.
The anti-freezing and anti-blocking throttling oil nozzle is used as follows:
(1) injecting the prepared compound hydrate inhibitor into an inhibitor liquid storage tank 10 before operation;
(2) after the pressure detector 5 and the temperature detector 6 detect that the temperature and pressure condition reaches the hydrate generation condition, the gate valve 11 is automatically opened, the inhibitor is injected into the adding box 12 from the liquid storage box 10, the flow meter 7 detects the flow of the inhibitor, the gate valve 11 is closed after the inhibitor flows into the agent with a fixed amount, the gate valve 12 is opened, and the inhibitor is sucked into the gate valve 12 and is closed by utilizing the Venturi principle;
(3) after the pressure detector 5 and the temperature detector 6 detect that the temperature and pressure conditions reach the generation conditions of the hydrate, the electric heaters 8 are simultaneously started, and the electric heaters are closed after heating for a certain time;
(4) when the liquid level monitoring meter monitors that the inhibitor in the liquid storage tank is less than 30%, the indicating lamp is turned on to prompt that the storage amount of the inhibitor is insufficient, and a worker is reminded to add the inhibitor.
In the implementation process, the proportion of the compound hydrate inhibitor can be adjusted according to specific working conditions, and the setting of the addition amount, the heating time and the power of the inhibitor under general or special working conditions can also be realized through a computer.
Claims (8)
1. The utility model provides a throttle choke that prevents frostbite and block up, includes valve body (3), is arranged in throttle choke (2) of valve body, pressure measurement appearance (5), temperature-detecting appearance (6), electric heater (8), inhibitor add case (12), flowmeter (7), inhibitor liquid reserve tank (10) and computer (9), its characterized in that, pressure measurement appearance (5), temperature-detecting appearance (6) and electric heater (8) set up in pipeline export (4) of throttle choke (2), inhibitor adds case (12) and sets up in pipeline entry (1) of throttle choke (2), and inhibitor adds the case and passes through flowmeter (7) and connect inhibitor liquid reserve tank (10), and the inhibitor liquid reserve tank is equipped with hydrate inhibitor to be equipped with liquid level monitoring meter (14) and pilot lamp (15), inhibitor liquid reserve tank, inhibitor add case and install gate valve A (11) respectively, And the pressure detector, the temperature detector, the electric heater, the flowmeter, the gate valve A, the gate valve B and the liquid level monitor are all connected with the computer (9).
2. The throttling nipple of claim 1, wherein the pressure detector and the temperature detector are installed at the outlet of the throttled pipeline, and a packing seal is arranged at the installation position.
3. The anti-freezing throttling nipple as claimed in claim 1, wherein the pressure detector and the temperature detector monitor the temperature and the pressure in the pipeline in real time and transmit data to the computer, and the computer analyzes the temperature and the pressure data in the pipeline by combining with the phase equilibrium curve of the natural gas hydrate to judge whether the temperature and the pressure conditions generated by the hydrate in the pipeline are reached.
4. The choke-resistant choke fitting of claim 1, wherein the electric heater is mounted at the outlet of the throttled conduit and is in close proximity to the wall of the conduit.
5. The anti-freezing choke nipple of claim 1, wherein said computer controls the activation and deactivation, duration and power of said electric heater.
6. The choke-resistant choke valve of claim 1, wherein the computer controls the opening and closing of the inhibitor addition tank and the inhibitor reservoir tank.
7. The anti-freezing choke nipple of claim 1, wherein when the level monitor detects that the amount of inhibitor in the tank is less than 30%, an indicator light is turned on to indicate that the amount of inhibitor stored is insufficient.
8. The anti-freeze plug throttling nozzle of claim 1, wherein the computer controls the electric heater to operate simultaneously with or separately from the inhibitor reservoir.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110217858.3A CN112696613A (en) | 2021-02-26 | 2021-02-26 | Anti-freezing and anti-blocking throttling oil nozzle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110217858.3A CN112696613A (en) | 2021-02-26 | 2021-02-26 | Anti-freezing and anti-blocking throttling oil nozzle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112696613A true CN112696613A (en) | 2021-04-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110217858.3A Pending CN112696613A (en) | 2021-02-26 | 2021-02-26 | Anti-freezing and anti-blocking throttling oil nozzle |
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| Country | Link |
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| CN (1) | CN112696613A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022246621A1 (en) * | 2021-05-25 | 2022-12-01 | 大连理工大学 | Low-energy-consumption dynamic thermal management system for solid matter prevention and control in distributed oil-gas transportation pipeline |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1892458A1 (en) * | 2006-08-22 | 2008-02-27 | Nederlandse Organisatie voor toegepast- natuurwetenschappelijk onderzoek TNO | Controlled formation of hydrates |
| CN104453785A (en) * | 2014-10-21 | 2015-03-25 | 西南石油大学 | Pneumatic heating device preventing hydrates from being generated at throttling part of gas well |
| CN104595720A (en) * | 2015-01-20 | 2015-05-06 | 中国石油天然气股份有限公司 | Freezing blockage preventing device |
| CN106195347A (en) * | 2016-07-11 | 2016-12-07 | 常州大学 | A kind of anti-icing stifled automatic fluid injection choke valve being provided with reservoir |
| CN109915095A (en) * | 2017-12-12 | 2019-06-21 | 新昌县正茂建筑材料有限公司 | A kind of oil well control set pressure device |
| CN210564481U (en) * | 2019-09-30 | 2020-05-19 | 山东科技大学 | Automatic defense device for hydrate of deepwater drilling kill line |
| CN111322061A (en) * | 2020-04-21 | 2020-06-23 | 西南石油大学 | Pressure gauge for high-pressure water injection well |
-
2021
- 2021-02-26 CN CN202110217858.3A patent/CN112696613A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1892458A1 (en) * | 2006-08-22 | 2008-02-27 | Nederlandse Organisatie voor toegepast- natuurwetenschappelijk onderzoek TNO | Controlled formation of hydrates |
| CN104453785A (en) * | 2014-10-21 | 2015-03-25 | 西南石油大学 | Pneumatic heating device preventing hydrates from being generated at throttling part of gas well |
| CN104595720A (en) * | 2015-01-20 | 2015-05-06 | 中国石油天然气股份有限公司 | Freezing blockage preventing device |
| CN106195347A (en) * | 2016-07-11 | 2016-12-07 | 常州大学 | A kind of anti-icing stifled automatic fluid injection choke valve being provided with reservoir |
| CN109915095A (en) * | 2017-12-12 | 2019-06-21 | 新昌县正茂建筑材料有限公司 | A kind of oil well control set pressure device |
| CN210564481U (en) * | 2019-09-30 | 2020-05-19 | 山东科技大学 | Automatic defense device for hydrate of deepwater drilling kill line |
| CN111322061A (en) * | 2020-04-21 | 2020-06-23 | 西南石油大学 | Pressure gauge for high-pressure water injection well |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022246621A1 (en) * | 2021-05-25 | 2022-12-01 | 大连理工大学 | Low-energy-consumption dynamic thermal management system for solid matter prevention and control in distributed oil-gas transportation pipeline |
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Application publication date: 20210423 |
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| RJ01 | Rejection of invention patent application after publication |