CN115898710A - Non-condensation double-wall pipe liquefied natural gas supply system - Google Patents
Non-condensation double-wall pipe liquefied natural gas supply system Download PDFInfo
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- CN115898710A CN115898710A CN202211368466.8A CN202211368466A CN115898710A CN 115898710 A CN115898710 A CN 115898710A CN 202211368466 A CN202211368466 A CN 202211368466A CN 115898710 A CN115898710 A CN 115898710A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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- Y02T10/30—Use of alternative fuels, e.g. biofuels
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Abstract
The invention discloses a condensed water-free double-wall pipe liquefied natural gas supply system, which comprises a gas heater, double-wall pipes, a double-wall pipe air draft system, a first temperature sensor and a humidity sensor, wherein the gas heater is arranged on the gas heater; a flow regulating valve is arranged at the heating medium inlet of the gas heater; a second temperature sensor is arranged at a gas outlet of the gas heater; the non-condensation water double-wall pipe liquefied natural gas supply system also comprises a data processing and control module; first temperature sensor, second temperature sensor, humidity transducer and flow control valve all connect in data processing and control module. The invention can prevent the air between the double-wall pipes from generating condensed water.
Description
Technical Field
The invention relates to the technical field of ships, in particular to a non-condensation double-wall pipe liquefied natural gas supply system.
Background
In order to meet the safety requirement, the pipelines used by the liquefied natural gas fuel engine in the engine room are double-wall pipes, namely, an inner pipeline and an outer pipeline are arranged on the cross section of a gas pipe in the engine room. The inner pipe is filled with liquefied natural gas for engine, and the fuel is gaseous fuel heated by heater to about-160 deg.c and 0-60 deg.c. Air flows between the inner pipe and the outer pipe, the space between the inner wall and the outer wall adopts mechanical air draft according to relevant regulations, the air exchange frequency is not less than 30 times per hour, and negative pressure is always kept. Meanwhile, a dangerous gas detection device is arranged at the air outlet, and information of gas leakage of the inner pipe can be acquired at the first time.
In summer, air with high humidity and high temperature flows between the inner pipe and the outer pipe, water in the air is easily analyzed to generate condensed water after the air is contacted with the pipe wall of the inner pipe with lower temperature (about 30 ℃), accumulated liquid is easily generated at the lower part of a pipeline in the past, normal air circulation between the inner pipe and the outer pipe is possibly blocked, and finally, whether gas in the inner pipe leaks or not cannot be monitored by the gas detection device.
The solutions adopted today are generally: dry air is connected to the air inlet to reduce the dew point of the air, so that no condensate is separated out after the mixed air is contacted with the pipe wall of the inner pipe at a lower temperature. The dry air was obtained by reducing the pressure of 0.7MPa of control air.
The dry air enters the double-wall pipe space after being simply mixed with the external air through the pressure reducing valve, the throttle orifice and other devices, the mixing amount of the control air cannot be controlled according to the temperature and humidity change on the sea, whether the dew point temperature of the mixed air is lower than the temperature of the inner pipe cannot be known, whether the purpose of preventing the generation of condensed water is achieved cannot be evaluated, and meanwhile, unnecessary energy consumption can be increased.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a non-condensed water double-wall pipe liquefied natural gas supply system.
The invention solves the technical problems through the following technical scheme:
a non-condensation double-wall pipe liquefied natural gas fuel gas supply system comprises a fuel gas heater for heating fuel from a fuel tank into a gaseous state, double-wall pipes for conveying the fuel gas to a fuel engine through a fuel gas valve group unit, and a double-wall inter-pipe air-extraction system for continuously circulating air between the double-wall pipes; the device also comprises a first temperature sensor for detecting the atmospheric temperature and a humidity sensor for detecting the atmospheric humidity; a flow regulating valve for regulating the flow of the heating medium entering the gas heater is arranged at the heating medium inlet of the gas heater; a second temperature sensor for detecting the temperature of the fuel gas is arranged at the fuel gas outlet of the fuel gas heater; the non-condensation water double-wall pipe liquefied natural gas supply system also comprises a data processing and control module for controlling the flow regulating valve on the basis of the calculated atmospheric dew point temperature and the gas temperature detected by the second temperature sensor; first temperature sensor, second temperature sensor, humidity transducer and flow control valve all connect in data processing and control module.
The data processing and control module is a programmable logic controller which can calculate the dew point temperature of the atmosphere according to the atmospheric temperature detected by the first temperature sensor and the atmospheric humidity detected by the humidity sensor.
The non-condensation double-wall pipe liquefied natural gas supply system also comprises a gas heating control box; first temperature sensor, humidity transducer and data processing and control module all locate in the gas heating control box.
First temperature sensor, second temperature sensor, humidity transducer and flow control valve all connect in data processing and control module through the signal cable.
The double-wall pipe comprises an inner pipe for conveying gas and an outer pipe sleeved on the inner pipe, and a channel for air to flow is formed between the inner pipe and the outer pipe.
The double-walled intertubular extraction system includes an extractor for extracting air between the inner and outer tubes of the double-walled tube and exhausting the air to the atmosphere.
The air inlet of the double-wall inter-pipe air extraction system comprises a double-wall pipe air inlet arranged on the fuel engine and an air inlet at the end part of the double-wall pipe before the gas pipeline enters the cabin.
And an air outlet of the double-wall inter-pipe air extraction system is arranged on the gas valve group unit.
The double-wall intertubular air draft system also comprises a dangerous gas detector arranged in front of an air inlet of the exhaust fan.
The material of the double-wall pipe is metal.
The invention has the beneficial effects that: according to the invention, the temperature monitoring and controlling device is arranged to realize the adjustment of the gas temperature, and the temperature of the gas in the double-wall pipe is always higher than the dew point temperature of the atmosphere, so that the outer wall of the inner pipe contacting with the atmosphere does not generate condensed water; dry air is not needed to be connected between the double-wall pipes, and the worry that the air entering the double-wall pipes can generate condensed water is avoided; the heating temperature of the fuel gas is dynamically adjusted according to the changes of the temperature and the humidity of the air above sea under different conditions, and the control of the temperature of the fuel gas is more scientific.
Drawings
Fig. 1 is a schematic structural diagram of a preferred embodiment of the present invention.
Fig. 2 isbase:Sub>A cross-sectional view taken along linebase:Sub>A-base:Sub>A of fig. 1.
FIG. 3 is a flowchart of a preferred embodiment of the present invention.
Detailed Description
The present invention will be more clearly and completely described in the following description of preferred embodiments, taken in conjunction with the accompanying drawings.
As shown in fig. 1 and 2, a non-condensing double-walled pipe lng fuel gas supply system includes a fuel gas heater 10 for heating fuel from a fuel tank 17 to a gaseous state, a double-walled pipe 20 for delivering fuel gas to a fuel engine 16 through a fuel gas valve block unit 15, and a double-walled pipe-to-pipe ventilation system for continuously circulating air between the double-walled pipes.
The double-walled pipe 20 includes an inner pipe 21 for transporting gas and an outer pipe 22 fitted around the inner pipe, and a passage for air to flow is formed between the inner pipe and the outer pipe. The material of the double-wall pipe is metal.
The double-walled inter-pipe air-extracting system includes an air extractor 41 for extracting air between the inner pipe and the outer pipe of the double-walled pipe and exhausting the air to the atmosphere, and a hazardous gas detector 45 provided before an air inlet of the air extractor 41.
The air inlet of the double-walled tube-to-tube extraction system includes a double-walled tube air inlet 42 provided on the fuel engine 16 and an air inlet 43 at the end of the double-walled tube before the gas line enters the nacelle 50.
An air outlet 44 of the double wall inter-pipe extraction system is provided on the gas valve block unit 15.
The air draft system between the double-wall pipes enables air between the double-wall pipes to continuously circulate, and the system is a mechanical air draft system. The air exchange times are not less than 30 times per hour as required, the air inlet is in a safe area, and the air inlet of the double-wall pipe on the engine and the air inlet of the end part of the double-wall pipe before the gas pipeline enters the cabin are respectively arranged. The air outlet pipeline of the double-wall pipe air extraction system is arranged on the gas valve group unit, and air on the fuel engine and at the end part of the double-wall pipe can be sucked into the gas valve group unit and then exhausted to the atmosphere through the air outlet pipeline and the exhaust fan. A hazardous gas detector is provided before air enters the exhaust blower so that information can be obtained at a first time in the event of a gas line leak.
The non-condensing double-wall pipe liquefied natural gas fuel gas supply system further comprises a first temperature sensor 31 for detecting the atmospheric temperature and a humidity sensor 33 for detecting the atmospheric humidity.
The gas fired heater has a heating medium inlet 11 and a heating medium outlet 12. The heating medium of the gas heater enters and exits the gas heater 10 through the medium conduit 18. The heating medium can heat the gas entering the gas heater 10 by heat exchange.
The gas heater 10 has a gas inlet 13 and a gas outlet 14. The gas heated by the gas heater 10 enters the gas buffer tank 51 through the gas pipeline 19, and then enters the engine room 50 through the gas buffer tank.
The heating medium inlet 11 of the gas heater 10 is provided with a flow regulating valve 34 for regulating the flow of the heating medium entering the gas heater.
A second temperature sensor 32 for detecting the temperature of the fuel gas is provided at the fuel gas outlet 14 of the fuel gas heater 10.
The non-condensing double-wall pipe liquefied natural gas fuel supply system further comprises a data processing and control module 35 for controlling the flow regulating valve on the basis of the calculated atmospheric dew point temperature and the fuel gas temperature detected by the second temperature sensor.
The first temperature sensor 31, the second temperature sensor 32, the humidity sensor 33 and the flow regulating valve 34 are all connected to the data processing and control module 35.
In this embodiment, the data processing and control module 35 is a programmable logic controller capable of calculating the dew point temperature of the atmosphere according to the atmospheric temperature detected by the first temperature sensor and the atmospheric humidity detected by the humidity sensor.
The non-condensation double-wall pipe liquefied natural gas fuel supply system also comprises a fuel gas heating control box 36; the first temperature sensor 31, the humidity sensor 33 and the data processing and control module 35 are all arranged in the gas heating control box 36.
The first temperature sensor 31, the second temperature sensor 32, the humidity sensor 33 and the flow regulating valve 34 are all connected to the data processing and control module 35 through signal cables 37.
The working process of the non-condensation double-wall pipe liquefied natural gas supply system comprises the following steps: the fuel tank sends the liquefied natural gas fuel to the fuel gas heater, heat exchange is carried out through a heating medium in the fuel gas heater, and the liquefied natural gas fuel is heated into gaseous fuel gas meeting the combustion requirement of the fuel engine; the fuel gas enters a fuel gas buffer tank on the deck and then enters the engine room through a pipeline from the fuel gas buffer tank; after entering the engine room, all gas pipelines need to adopt double-wall pipes due to safety requirements, and liquefied natural gas flowing in the inner pipes of the double-wall pipes enters a fuel engine for combustion after passing through a gas valve group unit.
And a flow regulating valve is arranged at the heating medium inlet of the gas heater and can receive a valve opening regulating signal given by the data processing and control module. First temperature sensor and humidity transducer can survey atmospheric temperature and humidity respectively in real time. The data processing and control module calculates the dew point temperature of the atmosphere according to the atmospheric temperature measured by the first temperature sensor and the atmospheric humidity measured by the humidity sensor. The atmospheric dew point temperature is used as a minimum temperature reference value to which the fuel gas needs to be heated. And a second temperature sensor is arranged at a gas outlet of the gas heater, the temperature of the heated gas is fed back to the data processing and control module in real time and is compared with a reference temperature value, and then a flow regulating instruction is given to a flow regulating valve at a heating medium inlet of the gas heater.
As shown in fig. 3, if the gas temperature at the gas outlet of the gas heater is lower than the dew point temperature of the atmosphere, the opening degree of the flow rate adjusting valve at the heating medium inlet of the gas heater is increased, and the flow rate of the heating medium is increased, so as to increase the heating temperature of the gas in the gas heater, and thus the gas temperature at the gas outlet of the gas heater is increased. When the gas temperature at the gas outlet of the gas heater is higher than the atmospheric dew point temperature, the flow regulating valve at the heating medium inlet of the gas heater does not need to be regulated.
In the invention, the temperature of the fuel gas in the double-wall pipe is always higher than the dew point temperature of the atmosphere, so that the outer wall of the inner pipe contacted with the atmosphere does not generate condensed water. Dry air is not needed to be connected between the double-wall pipes, and the worry that the air entering the double-wall pipes can generate condensed water is avoided. The heating temperature of the fuel gas is dynamically adjusted according to the changes of the temperature and the humidity of the air above sea under different conditions, and the control of the temperature of the fuel gas is more scientific.
The invention relates to a non-condensed water double-wall pipe liquefied natural gas supply system, which is a gas supply system with temperature monitoring and control functions, realizes the regulation of gas temperature by arranging a temperature monitoring and control device, and realizes that no condensed water is generated between double-wall pipes when the system runs.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (10)
1. A non-condensation double-wall pipe liquefied natural gas fuel gas supply system comprises a fuel gas heater for heating fuel from a fuel tank into a gaseous state, double-wall pipes for conveying the fuel gas to a fuel engine through a fuel gas valve group unit, and a double-wall inter-pipe air-extraction system for continuously circulating air between the double-wall pipes; the device is characterized by also comprising a first temperature sensor for detecting the atmospheric temperature and a humidity sensor for detecting the atmospheric humidity; a flow regulating valve for regulating the flow of the heating medium entering the gas heater is arranged at the heating medium inlet of the gas heater; a second temperature sensor for detecting the temperature of the fuel gas is arranged at the fuel gas outlet of the fuel gas heater; the non-condensation water double-wall pipe liquefied natural gas supply system also comprises a data processing and control module for controlling the flow regulating valve on the basis of the calculated atmospheric dew point temperature and the gas temperature detected by the second temperature sensor; first temperature sensor, second temperature sensor, humidity transducer and flow control valve all connect in data processing and control module.
2. The non-condensing double-walled tube liquefied natural gas fuel gas supply system according to claim 1, wherein the data processing and control module is a programmable logic controller capable of calculating an atmospheric dew point temperature according to the atmospheric temperature detected by the first temperature sensor and the atmospheric humidity detected by the humidity sensor.
3. The non-condensing double-walled tube liquefied natural gas fuel gas supply system according to claim 1, further comprising a fuel gas heating control box; first temperature sensor, humidity transducer and data processing and control module all locate in the gas heating control box.
4. The non-condensing double-wall pipe liquefied natural gas fuel gas supply system according to claim 1, wherein the first temperature sensor, the second temperature sensor, the humidity sensor and the flow regulating valve are connected to the data processing and control module through signal cables.
5. The non-condensing double-walled tube lng gas supply system according to claim 1, wherein the double-walled tube comprises an inner tube for transporting gas and an outer tube fitted around the inner tube, and a passage for air flow is formed between the inner tube and the outer tube.
6. The non-condensing double-walled tube liquefied natural gas fuel gas supply system of claim 5, wherein the double-walled tube inter-draft system comprises a draft fan for drawing air between the inner tube and the outer tube of the double-walled tube and discharging the air to the atmosphere.
7. The non-condensing double-walled tube lng gas supply system according to claim 6, wherein the air inlet of the double-walled tube inter-draft system comprises a double-walled tube air inlet provided in the fuel engine and an air inlet of an end of the double-walled tube before the gas tube enters the cabin.
8. The non-condensing double-wall pipe liquefied natural gas fuel supply system of claim 6, wherein an air outlet of the double-wall pipe inter-draft system is provided on the fuel valve block unit.
9. The non-condensing double-walled tube liquefied natural gas fuel gas supply system of claim 6, wherein the double-walled tube draft system further comprises a hazardous gas detector disposed before an air inlet of the draft fan.
10. The non-condensing double-walled tube liquefied natural gas fuel gas supply system according to claim 5, wherein the material of the double-walled tube is metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211368466.8A CN115898710A (en) | 2022-11-03 | 2022-11-03 | Non-condensation double-wall pipe liquefied natural gas supply system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211368466.8A CN115898710A (en) | 2022-11-03 | 2022-11-03 | Non-condensation double-wall pipe liquefied natural gas supply system |
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| CN115898710A true CN115898710A (en) | 2023-04-04 |
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| CN202211368466.8A Pending CN115898710A (en) | 2022-11-03 | 2022-11-03 | Non-condensation double-wall pipe liquefied natural gas supply system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20200157784A1 (en) * | 2011-01-03 | 2020-05-21 | Sentinel Hydrosolutions, Llc | Fluid Leak Detector With Thermal Dispersion Flow Meter and Chronometric Monitor |
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2022
- 2022-11-03 CN CN202211368466.8A patent/CN115898710A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20200157784A1 (en) * | 2011-01-03 | 2020-05-21 | Sentinel Hydrosolutions, Llc | Fluid Leak Detector With Thermal Dispersion Flow Meter and Chronometric Monitor |
| US12006667B2 (en) * | 2011-01-03 | 2024-06-11 | Sentinel Hydrosolutions, Llc | Fluid leak detector with thermal dispersion flow meter and chronometric monitor |
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