WO2023015837A1 - Defrosting method for air-bath gasifiers of liquefied natural gas (lng) transmission and distribution station - Google Patents
Defrosting method for air-bath gasifiers of liquefied natural gas (lng) transmission and distribution station Download PDFInfo
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- WO2023015837A1 WO2023015837A1 PCT/CN2022/000114 CN2022000114W WO2023015837A1 WO 2023015837 A1 WO2023015837 A1 WO 2023015837A1 CN 2022000114 W CN2022000114 W CN 2022000114W WO 2023015837 A1 WO2023015837 A1 WO 2023015837A1
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- Prior art keywords
- air
- natural gas
- lng
- bath
- liquefied natural
- Prior art date
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- 238000010257 thawing Methods 0.000 title claims abstract description 9
- 239000003949 liquefied natural gas Substances 0.000 title abstract description 32
- 238000000034 method Methods 0.000 title abstract description 7
- 230000005540 biological transmission Effects 0.000 title abstract description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000003345 natural gas Substances 0.000 claims abstract description 15
- 238000002309 gasification Methods 0.000 claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 230000008016 vaporization Effects 0.000 abstract 1
- 238000009834 vaporization Methods 0.000 abstract 1
- 239000006200 vaporizer Substances 0.000 description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 239000007788 liquid Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
- F17C7/02—Discharging liquefied gases
- F17C7/04—Discharging liquefied gases with change of state, e.g. vaporisation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F17/00—Removing ice or water from heat-exchange apparatus
-
- 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
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
Definitions
- the present invention relates to a defrosting method for the air-bath gasifier of liquefied natural gas (abbreviated as LNG) gasification equipment when frosting is serious.
- LNG liquefied natural gas
- Liquefied natural gas (referred to as LNG.
- the temperature is minus 160°C).
- liquefied natural gas must be gasified into a gaseous state before it can be used.
- the air bath vaporizer (similar in structure to a radiator, has the opposite effect. It absorbs the heat in the air through the blades to heat up the material in the pipeline. Therefore, it is also called an air temperature vaporizer or Air vaporizer) is a cheap and efficient gasification equipment, but because the outer surface of the low-temperature air bath vaporizer will condense the water in the air, and frost and freeze on the outer surface of the air bath vaporizer.
- the air-bath gasifier is hindered from contacting with the air, and the LNG cannot absorb heat from the air to gasify.
- the air-bath gasifier does not work, and the liquid LNG directly enters the downstream pipe network through the air-bath gasifier, causing damage. So the air bath vaporizer must be defrosted. Generally, it is defrosting by physical knocking or external heating, which will either damage the equipment or cost too much.
- the present invention utilizes the inherent equipment of general liquefied natural gas gasification stations—the water bath gasifier, to heat from the inside of the air bath gasifier, so as to achieve the purpose of defrosting.
- LNG stations general liquefied natural gas transmission and distribution stations
- air bath vaporizer the structure of the air bath vaporizer is similar to that of a radiator, and its function is opposite. It absorbs the heat in the air through the blades, so that the material in the pipeline heats up
- LNG is output from A to D.
- blades are used to absorb the heat in the air, so that the temperature of LNG rises above 0°C, and the natural gas changes from liquid to gas, and its volume expands hundreds of times. (Normal temperature and pressure, LNG volume expansion 600 times).
- E is closed and H is opened, and H directly enters the natural gas pipeline network M.
- LNG is exported from A to D, because the air temperature is low, after the LNG passes through D, the temperature is still below zero, and it cannot directly enter the pipeline network M, it must be heated through F (H. is closed, E and G are open), so that the temperature of natural gas rises to 0°C Above, enter the pipe network M again.
- the 2nd device can also defrost and deice the air bath vaporizer of the 3rd, 4th... device.
- the 1.3.4... device can also defrost the 2nd device Deicing. If there are several devices, the rear installation pipes (dotted line) of several devices can be connected in parallel. Mutual defrosting and deicing.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
A defrosting method for air-bath gasifiers (D1, D2) of a liquefied natural gas (LNG) transmission and distribution station. Heating is performed from the inside of air-bath gasifiers (D1, D2), such that the purpose of defrosting the outer surfaces of the air-bath gasifiers (D1, D2) can be achieved. An LNG station comprises more than one gasification device; several gasification devices would not be enabled at the same time; one or several paths of gasified warm natural gas from vaporization devices that are enabled later are used for defrosting and deicing the air-bath gasifiers (D1, D2) that have been used overtime.
Description
技术领域：本发明是液化天然气(简称LNG)气化设备空浴气化器结霜严重时的除霜方法。Technical field: The present invention relates to a defrosting method for the air-bath gasifier of liquefied natural gas (abbreviated as LNG) gasification equipment when frosting is serious.
液化天然气(简称LNG。温度在零下160℃)。一般液化天然气必须先气化成气态才能使用，空浴气化器(结构类似暖气片，作用与之相反，是通过叶片吸收空气中热量，使得管道中物质升温。所以也有人称空温气化器或空气气化器)是一种廉价高效的气化设备，但是由于低温空浴气化器的外表面会凝聚空气中的水，并在空浴气化器外表面结霜结冰。阻碍空浴气化器与空气接触，液化天然气无法从空气中吸收热量气化，最严重时，空浴气化器不起作用，液态的LNG直接通过空浴气化器进入下游管网，造成损害。所以空浴气化器必须除霜。一般都是物理敲击除霜或外部加热除霜，这样要么伤害设备要么代价太大。Liquefied natural gas (referred to as LNG. The temperature is minus 160°C). Generally, liquefied natural gas must be gasified into a gaseous state before it can be used. The air bath vaporizer (similar in structure to a radiator, has the opposite effect. It absorbs the heat in the air through the blades to heat up the material in the pipeline. Therefore, it is also called an air temperature vaporizer or Air vaporizer) is a cheap and efficient gasification equipment, but because the outer surface of the low-temperature air bath vaporizer will condense the water in the air, and frost and freeze on the outer surface of the air bath vaporizer. The air-bath gasifier is hindered from contacting with the air, and the LNG cannot absorb heat from the air to gasify. In the worst case, the air-bath gasifier does not work, and the liquid LNG directly enters the downstream pipe network through the air-bath gasifier, causing damage. So the air bath vaporizer must be defrosted. Generally, it is defrosting by physical knocking or external heating, which will either damage the equipment or cost too much.
本发明是利用一般液化天然气气化场站的固有设备——水浴气化器，从空浴气化器内部加热，从而达到除霜目的。The present invention utilizes the inherent equipment of general liquefied natural gas gasification stations—the water bath gasifier, to heat from the inside of the air bath gasifier, so as to achieve the purpose of defrosting.
(二)发明内容：利用一般液化天然气气化场站的两路(或者两路以上)LNG气化固有设备，加装旁通管线，连接两路LNG气化固有设备的不同位置，利用其中一路的高温天然气给另一路的空浴气化器除霜。(2) Contents of the invention: use two (or more than two) LNG gasification inherent equipment in general liquefied natural gas gasification stations, install bypass pipelines, connect different positions of the two LNG gasification inherent equipment, and use one of them The high-temperature natural gas is used to defrost the air-bath vaporizer of the other path.
(附图1一般液化天气气化设备的简单工艺流程图)(Attached Figure 1 is a simple process flow diagram of general liquefied weather gasification equipment)
一般液化天然气输配站(以下称LNG站)的工艺流程简单说明：A brief description of the process flow of general liquefied natural gas transmission and distribution stations (hereinafter referred to as LNG stations):
A(LNG储罐)A(LNG storage tank)
B(LNG储罐出口阀)B(LNG storage tank outlet valve)
C(空浴气化器进口阀)C (air bath vaporizer inlet valve)
D(空浴气化器：空浴气化器结构类似暖气片，作用与之相反，是通过叶片吸收空气中热量，使得管道中物质升温)D (air bath vaporizer: the structure of the air bath vaporizer is similar to that of a radiator, and its function is opposite. It absorbs the heat in the air through the blades, so that the material in the pipeline heats up)
E(水浴气化器进口阀)E (water bath vaporizer inlet valve)
F(水浴气化器)F (water bath vaporizer)
G(水浴气化器出口阀)G (water bath vaporizer outlet valve)
H(水浴气化器旁通阀)H (water bath vaporizer bypass valve)
M(天然气管网)M (natural gas pipeline network)
一气温较高时(例如春季夏季秋季)，LNG气化流程简单说明1. When the temperature is high (such as spring, summer and autumn), a brief description of the LNG gasification process
A→B→C→D→H→MA→B→C→D→H→M
LNG从A输出到D，在空浴气化器里利用叶片吸收空气中热量，使得LNG温度升到0℃以上，天然气由液态变成气态，体积膨胀数百倍。(常温常压，LNG体积膨胀600倍)。E关闭H打开，由H直接进入天然气管网M。LNG is output from A to D. In the air-bath vaporizer, blades are used to absorb the heat in the air, so that the temperature of LNG rises above 0°C, and the natural gas changes from liquid to gas, and its volume expands hundreds of times. (Normal temperature and pressure, LNG volume expansion 600 times). E is closed and H is opened, and H directly enters the natural gas pipeline network M.
二气温较低时，(例如冬季)LNG气化流程简单说明2. When the temperature is low, (such as winter) a simple description of the LNG gasification process
A→B→C→D→E→F→G→MA→B→C→D→E→F→G→M
LNG从A输出到D，因为气温低，LNG经过D之后，温度仍在零下，不能直接进入管网M，必须经过F加热(H.关闭，E和G打开).使得天然气温度升到0℃以上，再进入管网M。LNG is exported from A to D, because the air temperature is low, after the LNG passes through D, the temperature is still below zero, and it cannot directly enter the pipeline network M, it must be heated through F (H. is closed, E and G are open), so that the temperature of natural gas rises to 0°C Above, enter the pipe network M again.
三气温较低时，LNG站运行时空浴气化器的问题3. When the temperature is low, the problem of the air bath vaporizer when the LNG station is running
当天然气经过空浴气化器温度仍在零下，空浴气化器的外面会凝聚空气中的水，并在空浴气化器外表面结霜结冰。空浴气化器使用超时，空浴气化器外表面结霜结冰厚度高达5CM，阻碍空浴气化器与空气接触，液化天然气无法从空气中吸收 热量气化，最严重时，空浴气化器不起作用，(液态)LNG直接进入F(水浴气化器)。造成设备损坏。许多LNG站用木锤敲碎冰块，容易损坏空浴气化器。或者在空浴气化器底部加装发热设备化冰，但是绝大部分热量都浪费在空气中。When the natural gas passes through the air-bath gasifier and the temperature is still below zero, the outside of the air-bath gasifier will condense the water in the air, and frost will form on the outer surface of the air-bath gasifier. If the air bath vaporizer is used overtime, the outer surface of the air bath vaporizer will be frosted and icy as thick as 5cm, which will hinder the contact between the air bath vaporizer and the air, and the liquefied natural gas cannot absorb heat from the air to vaporize. The vaporizer does not work, the (liquid) LNG goes directly to F (water bath vaporizer). cause equipment damage. Many LNG stations use wooden hammers to break up the ice, which can easily damage the air bath vaporizer. Or add heating equipment at the bottom of the air bath vaporizer to melt ice, but most of the heat is wasted in the air.
四解决方法(见附图2)Four solutions (see attached drawing 2)
大多数LNG站不是仅有1路设备，至少2路以上。只要安装一根管道(虚线部分)，一端连接C1和D1间，另一端连接F2和G32间。当D1结霜结冰严重时，关闭C1和G2.开启B2.C2.E2和N。这时第2路设备刚启用，D2没有结冰，因此天然气到达F2时，可以被加热零度以上(甚至20℃)这时G2关闭(或不完全关闭)，N开启.使得温暖天然气沿着后安装管道(虚线部分)进入D1，从空浴气化器内部.融化外部结冰.当空浴气化器外表面凝结冰融化时，整块结冰自行脱落，(无需融化全部结冰，节省热量)。天然气沿着1路设备的后续路径，进入管网。Most LNG stations do not only have 1-way equipment, but at least 2-way equipment. Just install a pipe (dotted line part), one end connects between C1 and D1, and the other end connects between F2 and G32. When D1 is severely frosted and icy, close C1 and G2 and open B2, C2, E2 and N. At this time, the second equipment has just been activated, and D2 has not frozen, so when the natural gas reaches F2, it can be heated above zero (even 20°C). At this time, G2 is closed (or not completely closed), and N is opened. This makes the warm natural gas along the rear Install the pipeline (dotted line part) into D1, from the inside of the air bath vaporizer. Melt the external ice. When the condensed ice on the outer surface of the air bath vaporizer melts, the whole block of ice will fall off by itself, (no need to melt all the ice, saving heat ). The natural gas enters the pipeline network along the follow-up path of the No. 1 equipment.
五同样道理，第2路设备也可以给第3，4....路设备的空浴气化器除霜除冰.第1.3.4...路设备也可以给第2路设备除霜除冰.有几路设备，就可以并联几路设备的后安装管道(虚线部分).相互除霜除冰。5. In the same way, the 2nd device can also defrost and deice the air bath vaporizer of the 3rd, 4th... device. The 1.3.4... device can also defrost the 2nd device Deicing. If there are several devices, the rear installation pipes (dotted line) of several devices can be connected in parallel. Mutual defrosting and deicing.
Claims (3)
- 本发明是从空浴气化器的内部加热，从而达到给空浴气化器外表面除霜除冰目的。The invention heats from the inside of the air-bath gasifier, so as to achieve the purpose of defrosting and deicing the outer surface of the air-bath gasifier.
- 加热的介质是天然气。The heating medium is natural gas.
- 加热的天然气来源是另一路LNG气化设备。就是说几路LNG气化设备可以相互除霜除冰。加热的天然气来源也可以是其他天然气(例如压缩天然气CNG)经过加热而成。The natural gas source for heating is another LNG gasification device. That is to say, several LNG gasification equipment can defrost and deice each other. The source of natural gas for heating can also be other natural gas (such as compressed natural gas (CNG)) after heating.
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| CN202110916036.4 | 2021-08-10 | ||
| CN202110916036.4A CN115704658A (en) | 2021-08-10 | 2021-08-10 | Defrosting method for air bath gasifier of Liquefied Natural Gas (LNG) transmission and distribution station |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207814932U (en) * | 2017-12-23 | 2018-09-04 | 瑞华特装(天津)低温设备有限公司 | A kind of liquefied natural gas gasifying system being conducive to defrosting |
| CN210241175U (en) * | 2019-06-27 | 2020-04-03 | 武汉市燃气热力规划设计院有限公司 | LNG vaporizing station gasification facility |
| CN212672948U (en) * | 2020-06-19 | 2021-03-09 | 中国寰球工程有限公司 | Gasification structure of LNG storage and transportation station |
| CN213900712U (en) * | 2020-12-09 | 2021-08-06 | 王娟 | Double-regeneration heat tracing type air temperature gasifier |
| CN214093981U (en) * | 2020-08-20 | 2021-08-31 | 青岛乐戈新能源科技有限公司 | Defrosting system of gasification station |
-
2021
- 2021-08-10 CN CN202110916036.4A patent/CN115704658A/en active Pending
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- 2022-08-10 WO PCT/CN2022/000114 patent/WO2023015837A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207814932U (en) * | 2017-12-23 | 2018-09-04 | 瑞华特装(天津)低温设备有限公司 | A kind of liquefied natural gas gasifying system being conducive to defrosting |
| CN210241175U (en) * | 2019-06-27 | 2020-04-03 | 武汉市燃气热力规划设计院有限公司 | LNG vaporizing station gasification facility |
| CN212672948U (en) * | 2020-06-19 | 2021-03-09 | 中国寰球工程有限公司 | Gasification structure of LNG storage and transportation station |
| CN214093981U (en) * | 2020-08-20 | 2021-08-31 | 青岛乐戈新能源科技有限公司 | Defrosting system of gasification station |
| CN213900712U (en) * | 2020-12-09 | 2021-08-06 | 王娟 | Double-regeneration heat tracing type air temperature gasifier |
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