CN104048161B - A kind of combined vaporizing device of liquified natural gas (LNG) - Google Patents
A kind of combined vaporizing device of liquified natural gas (LNG) Download PDFInfo
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- CN104048161B CN104048161B CN201410287254.6A CN201410287254A CN104048161B CN 104048161 B CN104048161 B CN 104048161B CN 201410287254 A CN201410287254 A CN 201410287254A CN 104048161 B CN104048161 B CN 104048161B
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Abstract
The invention discloses the combined vaporizing device of a kind of liquified natural gas (LNG), vaporizer and submerged combustion water heater including band central fluid, vaporizer with central fluid has seawater inlet and seawer outlet, submerged combustion water heater includes burner and has the tank of air vent, the flue gas distributor connected with burner it is provided with in tank, steam vent is offered on flue gas distributor, it is respectively equipped with sea water at seawater inlet and seawer outlet and enters control valve and sea water discharge control valve, tank is provided with inlet channel and outlet conduit, the upstream end connection of inlet channel is discharged between control valve and seawer outlet at sea water, the outlet side connection of outlet conduit enters between control valve and seawater inlet at sea water.The present invention carrys out the water in heating water tank by the heat that gas fuel burning produces, and the warm water in tank provides heat to make LNG heating and gasifying become NG for vaporizer.The present invention makes existing gasification installation be simplified, and can reduce investment and the operating cost of LNG receiving station.
Description
Technical field
The present invention relates to the combined vaporizing device of a kind of liquified natural gas (LNG), be particularly applicable to the LNG gasification device of Large LNG receiving station, belong to LNG gasification technical field.
Background technology
LNG receiving station is commonly equipped with base load gasifier and emergency peak regulation gasifier, and the effect of gasifier is the low temperature LNG heating and gasifying of receiving station and to be superheated to more than 0 DEG C natural gas (NG), is then fed into pipeline and carries out outer defeated.The system structure of the LNG gasification device in the LNG receiving station having in prior art is as it is shown in figure 1, it includes that base load gasifier with sea water as thermal source is for band intermediate fluid type gasifier (IFV) and submerged combustion gasifier (SCV) that natural gas (NG) is fuel heat supply.
The heat source medium of the gasifier (IFV) with central fluid is generally sea water, and central fluid is generally propane or butane etc., and the structure of IFV is as in figure 2 it is shown, it includes LNG gasification section and NG superheat section.LNG gasification section is a kind of shell-and-tube heat exchanger, this shell-and-tube heat exchanger includes first housing 1 sealed, the airtight central fluid 3 sealing certain liquid level up for safekeeping in first housing 1, it is positioned at the position below central fluid 3 liquid level in first housing 1 and there is lower tube bank 11, walking sea water in lower tube bank 11, lower tube bank 11 is immersed in central fluid；The position being positioned at central fluid 3 ullage in first housing 1 has upper tube bank 12, walks LNG in upper tube bank 12.NG superheat section includes that the second housing 2, the second housing 2 are connected by the upper tube bank 12 in admission line and the first housing 1, is provided with the overheated tube bank 21 connected with lower tube bank in the second housing 2.IFV is operationally, LNG is passed in the upper tube bank of the first housing, sea water is flowed in the lower tube bank of LNG gasification section from the overheated tube bank of NG superheat section, heating of seawater central fluid in lower tube bank makes central fluid evaporation gasification, gas overflowing liquid level arrives upper gaseous phase space and runs into tube bank, heat LNG is discharged at upper tube bank surface condensation, central fluid condensed fluid returns to bottom liquid pool under gravity and is again evaporated by the heating of seawater in lower tube bank, thus forms the inner loop of the evaporation of central fluid, condensation；The LNG gasification absorbing central fluid heat heats up, and is then entered in the second housing of NG superheat section by admission line, and sea water continues the LNG heat temperature raising gasified, until temperature reaches production engineering specifications.
The structure of submerged combustion gasifier (SCV) is as shown in Figure 3, it includes that burner 4 and top have the tank 6 of air vent 5, in tank 6, there is water bath shampoo, the snakelike tube bank of liquefied natural gas 9 it is provided with below the liquid level of water bath shampoo, the entrance and exit of this snakelike tube bank 9 is arranged on outside tank, being provided with the flue gas distributor 8 connected with burner 4 in tank 6, this flue gas distributor 8 is positioned at the position below snakelike tube bank 9, and flue gas distributor 8 offers steam vent 7.SCV is operationally, fuel gas produces high-temperature flue gas through burner combustion after mixing with air, high-temperature flue gas is directly discharged in tank through the steam vent of flue gas distributor, high-temperature flue gas and the water bath shampoo direct contact heat transfer in tank, again LNG is passed in snakelike tube bank by the entrance of snakelike tube bank, water bath shampoo after heating is by snakelike tube bank and the LNG heat exchange being passed in snakelike tube bank, LNG in snakelike tube bank is heated is gasificated into NG, NG discharges from the outlet of snakelike tube bank after being superheated to the outer defeated temperature required, temperature after final high-temperature flue gas and water bath shampoo heat exchange is close to bath temperature, last waste gas is discharged into the external world by air vent.
As it is shown in figure 1, the LNG inlet parallel of IFV and SCV is got up by the LNG gasification device of prior art by pipe-line system, and on the LNG inlet pipeline of IFV and SCV, it is respectively provided with valve 10 respectively.When ocean temperature is more than 6 ~ 8 DEG C, open the valve on IFV inlet pipeline, close the valve on SCV inlet pipeline, make IFV as base load gasifier, utilize sea water to carry out heating and gasifying LNG；When winter, ocean temperature was too low, in order to prevent the freezing equipment of seawater icing, close IFV valve and make IFV stop using, open SCV valve, at this moment start SCV and carry out heating and gasifying LNG as base load gasifier, the high-temperature flue gas produced by burning combustible gas.
Owing to IFV and SCV of the LNG gasification device of prior art each has the LNG tube bank that a set of independent operation controls, in order to the natural gas after gasifying enters the purpose of multi-purpose station pipeline, the operation pressure of LNG tube bank is the highest, operation temperature is the lowest, the valve 10 being connected on LNG pipeline needs to use expensive high pressure low temperature valve, and this causes the investment of LNG receiving station and cost the highest.
Summary of the invention
It is an object of the invention to provide the combined vaporizing device of a kind of liquified natural gas (LNG) that can reduce cost, to solve the technical problem that LNG receiving station invests and cost is high of prior art.
nullThe present invention adopts the following technical scheme that the combined vaporizing device of a kind of liquified natural gas (LNG)，Vaporizer including band central fluid，The vaporizer of this band central fluid has seawater inlet、Seawer outlet、LNG entrance and NG outlet，The combined vaporizing device of described liquified natural gas (LNG) also includes submerged combustion water heater，Described submerged combustion water heater includes burner and has the tank of air vent，The flue gas distributor connected with burner it is provided with in tank，Steam vent is offered on flue gas distributor，It is respectively equipped with sea water on the second pipe that the first pipeline that described seawater inlet is connected is connected with seawer outlet and enters control valve and sea water discharge control valve，Described tank is provided with inlet channel and outlet conduit，The second pipe that the upstream end of described inlet channel is discharged between control valve and seawer outlet with sea water connects，The outlet side of described outlet conduit and sea water enter the first pipeline communication between control valve and seawater inlet.
The vaporizer of described band central fluid includes lower tube bank, the upper tube bank of U-shape structure and heat-exchanging tube bundle, being provided with the steam trap that its inner chamber is divided into upper and lower two heat transfer zone between upper tube bank and lower tube bank, steam trap structure is corrugated sheet or wire mesh membrane or corrugated sheet adds silk screen combinative structure form.
Described lower tube bank, upper tube bank and heat-exchanging tube bundle are the corrugated tube with two-sided strengthened heat transfer structure or conduit pipe or winding pipe or corrugated tubing or finned tube or straight fins pipe.
It is provided with bypass duct between described seawater inlet and seawer outlet.
One end of described bypass duct connects on the first pipeline, the other end connects on inlet channel.
On bypass duct, the one end near the first pipeline is provided with inlet control valve, and on described bypass duct, the one end near inlet channel is provided with discharge control valve.
Described outlet conduit is provided with water circulating pump.
Described inlet channel is provided with water inlet control valve, and described outlet conduit is provided with outlet water control valve.
Discharge at seawer outlet and sea water on described second pipe and be provided with sea water outlet water control valve on the position between control valve.
The present invention carrys out the water in heating water tank by the heat that gas fuel burning produces, when winter, ocean temperature was too low, sea water can be entered control valve and sea water is discharged control valve and closed, now the vaporizer of band central fluid disables sea water, its thermal source is provided by the warm water in submerged combustion water heater, this warm water is in inlet channel is flowed into the vaporizer of band central fluid, warm water is flowed into again in tank by inlet channel after LNG absorbing and cooling temperature, enters into heating and gasifying LNG in the vaporizer of band central fluid after warm water reheating again.The present invention is compared with prior art, not only eliminate the snakelike tube bank of LNG and LNG pipeline control system, avoid the need for using expensive high pressure low temperature valve, the present invention the most all uses the vaporizer of band central fluid to carry out LNG gasification, make existing gasification installation be simplified, therefore present invention reduces investment and the cost of LNG receiving station.
Further, in same housing, tube bank heating below makes liquid phase changing the flow of QI-blood phase in housing, restrains above and is condensed change liquid phase by gas-phase heating, arranges gas-liquid separator between and be effectively improved heat exchange efficiency.
Further, by-pass line can be started when drainage system or emergency episode, make the water in liquified natural gas gasification installation of the present invention empty, thus the security reliability of plant running can be improved.
Further, available water circulating pump is by the vaporizer of the warm water conveyer belt central fluid in tank, and water circulating pump makes the seawater circulation in the submerged combustion water heater of the present invention be easier to.
Further, water inlet control valve and outlet water control valve can control the break-make of inlet channel and outlet conduit respectively, when ocean temperature reaches more than 6 ~ 8 DEG C, water inlet control valve, outlet water control valve can be closed, submerged combustion water heater out of service, only sea water is carried out heating and gasifying LNG as thermal source, thus can reach the effect saving the energy.
Accompanying drawing explanation
Fig. 1 is the system construction drawing of the LNG gasification device of prior art；
Fig. 2 is the structural representation of the gasifier of band central fluid in Fig. 1；
Fig. 3 is the structural representation of submerged combustion gasifier in Fig. 1；
Fig. 4 is the system construction drawing of an embodiment of the present invention；
Fig. 5 is the A-A sectional view of Fig. 4；
Fig. 6 is the structural representation of vapour liquid separator in Fig. 5；
Fig. 7 is the structural representation of vapour liquid separator in other embodiments of the present invention；
Fig. 8 is the structural representation of vapour liquid separator in other embodiments of the present invention；
Fig. 9 is the structural representation of vapour liquid separator in other embodiments of the present invention.
Detailed description of the invention
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
The system structure of an embodiment of the present invention is as shown in Fig. 4 ~ Fig. 5, and the liquified natural gas gasification installation of the present embodiment includes the vaporizer a1 and submerged combustion water heater a2 of band central fluid.Vaporizer a1 with central fluid includes LNG gasification section and NG superheat section.Wherein, LNG gasification section is a kind of shell-and-tube heat exchanger with double heat-exchanging tube bundle, this shell-and-tube heat exchanger includes first housing 1 sealed, the airtight central fluid 3 sealing certain liquid level up for safekeeping in first housing 1, central fluid can be the cold-producing medium such as propane or butane, is positioned at the position below central fluid 3 liquid level and has lower tube bank 11 in the first housing 1, and one end of lower tube bank 11 has seawater inlet 101, walking sea water in lower tube bank 11, lower tube bank 11 is immersed in central fluid 3；The position being positioned at central fluid 3 ullage in first housing 1 has upper tube bank 12, walks LNG in upper tube bank 12.NG superheat section includes the second housing 2, second housing 2 is by upper tube bank 12 outlet in admission line and the first housing, in second housing, 2 are provided with the overheated tube bank 21 that one end connects with the other end of lower tube bank 11, and the other end of overheated tube bank 21 has seawer outlet 102.The first pipeline 91 and second pipe 92 it is communicated with respectively at seawater inlet 101 and seawer outlet 102, it is respectively equipped with sea water on first pipeline 91 and second pipe 92 and enters control valve 103 and sea water discharge control valve 104, second pipe 92 is discharged at seawer outlet 102 and sea water and on the position between control valve 104, is provided with sea water outlet water control valve 110.The vaporizer of described band central fluid includes lower tube bank, the upper tube bank of U-shape structure and heat-exchanging tube bundle, the steam trap 33 that its inner chamber is divided into upper and lower two heat transfer zone is installed between upper tube bank and lower tube bank, the steam trap of the present embodiment uses the butterfly plate being suppressed with convex-concave groove as shown in Figure 6, during use, aperture can be offered on convex-concave groove, thus be conducive to improving heat exchange efficiency.
Submerged combustion water heater a2 includes burner 41 and has the tank 61 of air vent 51, the flue gas distributor 81 of combustion chamber with burner 41 it is provided with in tank 61, steam vent 71 is offered on flue gas distributor 81, tank 61 is provided with inlet channel 105 and outlet conduit 106, the upstream end connection of described inlet channel 105 is discharged between control valve 104 and seawer outlet on second pipeline 92 of 102 at sea water, and the outlet side connection of described outlet conduit 106 enters on the first pipeline 91 between control valve 103 and seawater inlet 101 at sea water.Outlet conduit 106 is provided with water circulating pump 100, and inlet channel 105 is provided with water inlet control valve 107, and outlet conduit 106 is provided with outlet water control valve 108.
The present embodiment is provided with bypass duct 13 between seawater inlet 101 and seawer outlet 102, one end of this bypass duct 13 connects on the first pipeline 91, the other end connects on inlet channel 105, on bypass duct 13, the one end near the first pipeline 91 is provided with inlet control valve 109, and bypass duct 13 is provided with discharge control valve 111 near one end of inlet channel 105.Inlet control valve 109 can be opened when drainage system or emergency episode and discharge control valve 111 starts by-pass line 13, thus the security reliability of plant running can be improved.
When the present invention uses under conditions of ocean temperature is more than 6 ~ 8 DEG C, sea water is entered control valve and sea water is discharged control valve and opened, water inlet control valve and outlet water control valve are closed, does not the most use submerged combustion water heater, only use the vaporizer of band central fluid to carry out heating and gasifying LNG.Operationally, LNG is passed in the upper tube bank of the first housing, sea water is flowed in the lower tube bank of LNG gasification section by header from the overheated tube bank of NG superheat section, heating of seawater central fluid in lower tube bank makes central fluid evaporation gasification, the steam of central fluid overflows liquid level arrival upper gaseous phase space and runs into tube bank, heat LNG is discharged at upper tube bank surface condensation, central fluid condensed fluid returns to bottom liquid pool under gravity and is again evaporated by the heating of seawater in lower tube bank, thus forms the inner loop of the evaporation of central fluid, condensation；The LNG gasification absorbing central fluid heat heats up, and is then entered in the second housing of NG superheat section by admission line, and the sea water in overheated tube bank continues the LNG heat temperature raising gasified, and finally gives temperature and reaches the NG of production engineering specifications.
nullWhen the present invention uses under conditions of ocean temperature is too low in the winter time，Such as when ocean temperature is less than 7 DEG C，Close sea water and enter control valve and sea water discharge control valve，Now the vaporizer of band central fluid disables sea water thermal source，Then starting submerged combustion water heater makes it start working，Fuel gas produces high-temperature flue gas through burner combustion after mixing with air，High-temperature flue gas is directly discharged in tank through the steam vent of flue gas distributor，High-temperature flue gas and the water direct contact heat-exchanging in tank，When the water in tank is heated to 7 ~ 35 DEG C，Open water inlet control valve and outlet water control valve，Start water circulating pump and the recirculated water of 7 ~ 35 DEG C is provided to vaporizer，Now the thermal source of the vaporizer of band central fluid is provided by the warm water in submerged combustion water heater，Vaporizer utilizes the warm water heating and gasifying LNG in tank，Warm water is flowed into again in tank by inlet channel after LNG absorbing and cooling temperature，Heating and gasifying LNG in the vaporizer of band central fluid is entered into again after warm water reheating，Final waste gas is discharged by the air vent on tank.
The present invention is compared with prior art, not only eliminate the snakelike tube bank of LNG and LNG pipeline control system, and the vaporizer of band central fluid the most all can be used to carry out LNG gasification, make existing gasification installation be simplified, therefore present invention reduces investment and the cost of LNG receiving station.
In the specific implementation, lower tube bank, upper tube bank and heat-exchanging tube bundle can use the corrugated tube with two-sided strengthened heat transfer structure or conduit pipe or winding pipe or corrugated tubing or finned tube or straight fins pipe to the present invention.
Above-described embodiment is one preferred embodiment of the present invention, and by-pass line is not necessary for the present invention, the most in other embodiments of the invention, can save by-pass line.
In other embodiments of the invention, steam trap can also use slab construction as shown in Figure 7, and this flat board uniformly offers aperture；Moisture separator can also use corrugated board structures as shown in Figure 8 or screen net structure as shown in Figure 9.
Although being the most described in detail embodiments of the present invention, but the invention is not restricted to above-mentioned embodiment, the scope of the present invention that appended claim limits comprises replacement and the change of all equivalents.
Claims (9)
- null1. the combined vaporizing device of a liquified natural gas (LNG)，Vaporizer (a1) including band central fluid，The vaporizer of this band central fluid has seawater inlet (101)、Seawer outlet (102)、LNG entrance and NG outlet，It is characterized in that: the combined vaporizing device of described liquified natural gas (LNG) also includes submerged combustion water heater (a2)，Described submerged combustion water heater (a2) includes burner (41) and has the tank (61) of air vent (51)，The flue gas distributor (81) connected with burner (41) it is provided with in tank (61)，Steam vent (71) is offered on flue gas distributor (81)，It is respectively equipped with sea water on the second pipe (92) that the first pipeline (91) that described seawater inlet (101) is connected is connected with seawer outlet (102) and enters control valve (103) and sea water discharge control valve (104)，Described tank (61) is provided with inlet channel (105) and outlet conduit (106)，The second pipe (92) that the upstream end of described inlet channel (105) is discharged between control valve (104) and seawer outlet (102) with sea water connects，The first pipeline (91) that the outlet side of described outlet conduit (106) enters between control valve (103) and seawater inlet (101) with sea water connects.
- The combined vaporizing device of a kind of liquified natural gas (LNG) the most according to claim 1, it is characterized in that: the vaporizer (a1) of described band central fluid includes lower tube bank (11), the upper tube bank (12) of U-shape structure and heat-exchanging tube bundle (21), being provided with the steam trap (33) that its inner chamber is divided into upper and lower two heat transfer zone between upper tube bank (12) and lower tube bank (11), steam trap (33) structure is corrugated sheet or wire mesh membrane or corrugated sheet adds silk screen combinative structure form.
- The combined vaporizing device of a kind of liquified natural gas (LNG) the most according to claim 2, it is characterised in that: described lower tube bank (11), upper tube bank (12) and heat-exchanging tube bundle (21) they are the corrugated tube with two-sided strengthened heat transfer structure or conduit pipe or winding pipe or corrugated tubing or finned tube.
- The combined vaporizing device of a kind of liquified natural gas (LNG) the most according to claim 1, it is characterised in that: it is provided with bypass duct (13) between described seawater inlet (101) and seawer outlet (102).
- The combined vaporizing device of a kind of liquified natural gas (LNG) the most according to claim 4, it is characterised in that: one end connection of described bypass duct (13) is upper at the first pipeline (91), the other end connects on inlet channel (105).
- The combined vaporizing device of a kind of liquified natural gas (LNG) the most according to claim 5, it is characterized in that: the upper one end near the first pipeline (91) of bypass duct (13) is provided with inlet control valve (109), the upper one end near inlet channel (105) of described bypass duct (13) is provided with discharge control valve (111).
- 7. according to the combined vaporizing device of a kind of liquified natural gas (LNG) described in claim 1 ~ 6 any one, it is characterised in that: described outlet conduit (106) is provided with water circulating pump (100).
- 8. according to the combined vaporizing device of a kind of liquified natural gas (LNG) described in claim 1 ~ 6 any one, it is characterized in that: described inlet channel (105) is provided with water inlet control valve (107), described outlet conduit (106) is provided with outlet water control valve (108).
- 9. according to the combined vaporizing device of a kind of liquified natural gas (LNG) described in claim 1 ~ 6 any one, it is characterised in that: the position being positioned between seawer outlet (102) and sea water discharge control valve (104) on described second pipe (92) is provided with sea water outlet water control valve (110).
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| CN201410287254.6A CN104048161B (en) | 2014-06-25 | 2014-06-25 | A kind of combined vaporizing device of liquified natural gas (LNG) |
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| CN104359003B (en) * | 2014-10-27 | 2016-09-07 | 中国海洋石油总公司 | Liquefied natural gas self power generation open type gasification system |
| CN104964157A (en) * | 2015-07-09 | 2015-10-07 | 江苏中圣高科技产业有限公司 | Method and device for improving liquefied natural gas gasification energy-saving efficiency |
| CN105042326B (en) * | 2015-07-09 | 2018-04-27 | 江苏中圣高科技产业有限公司 | Close-coupled intermediate fluid type gasifier |
| CN106545935B (en) * | 2016-10-27 | 2019-07-05 | 航天科工哈尔滨风华有限公司 | It is a kind of using intermediate medium gasifier as the air-conditioning system of cold source |
| CN107883185A (en) * | 2017-07-04 | 2018-04-06 | 上海新奥新能源技术有限公司 | LNG feeders and its workflow, LNG air supply systems |
| CN107356135A (en) * | 2017-07-26 | 2017-11-17 | 山东钢铁集团日照有限公司 | A kind of open pond gasifier |
| CN109027669B (en) * | 2018-08-27 | 2023-08-29 | 天津华迈燃气装备股份有限公司 | LNG rapid gas supply system and method based on submerged combustion gasifier |
| CN109340560A (en) * | 2018-11-15 | 2019-02-15 | 上海宏华海洋油气装备有限公司 | Ocean platform formula receiving station LNG gasification device and gasification process |
| CN109668167A (en) * | 2019-01-08 | 2019-04-23 | 哈尔滨理工大学 | A kind of LNG submerged combustion gasifier flue gas distributor and its design method |
| CN110360447B (en) * | 2019-06-25 | 2021-04-23 | 常州瑞凯化工装备有限公司 | Ethylene cold storage gasification system and method for producing ethylbenzene |
| CN111022921B (en) * | 2019-11-27 | 2022-04-12 | 惠生（南通）重工有限公司 | Heat exchange system of printing plate type LNG vaporizer |
| CN113443117A (en) * | 2020-03-26 | 2021-09-28 | 南通中集太平洋海洋工程有限公司 | Liquid cargo ship and liquid cargo heating system thereof |
| ES1255744Y (en) * | 2020-09-11 | 2021-01-26 | Calvet Juan Eusebio Nomen | LNG regasification device and cold water and cold dry air cogenerator |
| CN114179975A (en) * | 2021-11-25 | 2022-03-15 | 江南造船(集团)有限责任公司 | Temperature control system, method and equipment for evaporator of liquefied gas carrier |
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Effective date of registration: 20181224 Address after: 211511 No. 108 Jing No. 2 Road, Nanjing Chemical Industrial Park, Jiangsu Province Patentee after: JIANGSU SUNPOWER PRESSURE VESSEL AND EQUIPMENT MANUFACTURING CO., LTD. Address before: 211112 No. 2111 Chengxin Avenue, Jiangning District, Nanjing, Jiangsu. Patentee before: Zhongsheng High Science & Technology Industry Co., Ltd., Jiangsu |