CN211977670U - LNG gasification heat exchange tower and LNG gasification system - Google Patents
LNG gasification heat exchange tower and LNG gasification system Download PDFInfo
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- CN211977670U CN211977670U CN202020509224.6U CN202020509224U CN211977670U CN 211977670 U CN211977670 U CN 211977670U CN 202020509224 U CN202020509224 U CN 202020509224U CN 211977670 U CN211977670 U CN 211977670U
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- 238000002309 gasification Methods 0.000 title claims abstract description 54
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 128
- 239000003546 flue gas Substances 0.000 claims abstract description 128
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 128
- 238000005507 spraying Methods 0.000 claims abstract description 45
- 239000007921 spray Substances 0.000 claims abstract description 17
- 239000007788 liquid Substances 0.000 claims abstract description 11
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 96
- 239000003345 natural gas Substances 0.000 claims description 49
- 238000002485 combustion reaction Methods 0.000 claims description 35
- 230000008016 vaporization Effects 0.000 claims description 11
- 239000003949 liquefied natural gas Substances 0.000 description 110
- 238000000034 method Methods 0.000 description 11
- 238000009834 vaporization Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 9
- 230000009471 action Effects 0.000 description 6
- 239000007789 gas Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
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Abstract
The utility model provides a LNG gasification heat exchange tower and LNG gasification system, the LNG gasification heat exchange tower comprises a heat exchange tower body, a flue gas inlet and a flue gas outlet are arranged on the heat exchange tower body, the flue gas outlet is higher than the flue gas inlet, circulating water is stored at the bottom of the heat exchange tower body, and the liquid level of the circulating water is lower than the flue gas inlet; the spraying layer is arranged in the heat exchange tower body and is provided with a plurality of spray heads for spraying circulating water to cover the whole cross section in the heat exchange tower body, the spraying layer is positioned between the flue gas inlet and the flue gas outlet, and flue gas in the heat exchange tower body can be in countercurrent contact with the circulating water sprayed by the spraying layer for heat exchange; the conveying pipeline is used for conveying circulating water in the tower body of the heat exchange tower to the spraying layer, and a circulating water pump is arranged on the conveying pipeline; the LNG heat exchange tube bundle is used for introducing LNG and is soaked in the circulating water of the heat exchange tower body. The system operating pressure can be reduced, the system pressure fluctuation is reduced, the system operating stability is improved, and the heat exchange efficiency is improved.
Description
Technical Field
The utility model relates to a LNG gasification technical field, more specifically say, relate to a LNG gasification heat transfer tower, the utility model discloses still relate to a LNG gasification system.
Background
LNG (Liquefied Natural Gas), which is liquid Natural Gas at normal pressure, is obtained by purifying Natural Gas produced in a Gas field and then liquefying the Natural Gas at a series of ultralow temperatures.
To facilitate the transportation of natural gas, natural gas is usually liquefied and stored at normal atmospheric pressure by cooling to approximately-162 c, whereas the temperature used by consumers is around 5 c, a process which is usually carried out by means of a gasifier. At present, the LNG is gasified by mainly adopting an SCV (submerged combustion gasifier), the SCV generates heat by adopting natural gas combustion, and the flue gas generated by combustion is conveyed to a water bath heater to be used for heating and gasifying the LNG.
Traditional SCV is often during directly letting in the water bath with the high temperature flue gas after the natural gas burning through flue gas distributor, makes the flue gas and the water contact heat transfer in the water bath, realizes the transfer of flue gas heat to aquatic, and the rethread arranges that the LNG heat exchange tube in the water bath finally gives LNG, realizes the gasification of LNG.
However, the resistance of the flue gas distributor and pool water needs to be overcome by flue gas in the traditional SCV, the resistance is large when the system operates, and pressure fluctuation exists in the process that the flue gas passes through the water bath pool, so that the pressure fluctuation of the SCV natural gas combustion chamber is easily caused, the conditions of fire extinguishment and the like are further caused, and the system operation is influenced.
In addition, when the flue gas exchanges heat with water in the water bath pool, the flue gas is completely wrapped by the water drum, and a certain boundary exists between the flue gas and the water during heat exchange, so that the heat exchange efficiency is low, and a high liquid level and a long heat exchange time are needed.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a LNG gasification heat transfer tower to reduce system's operating pressure, reduce system's pressure fluctuation, and then improve system's operating stability, and improve heat exchange efficiency.
Another object of the utility model is to provide an LNG gasification system with above-mentioned LNG gasification heat transfer tower.
In order to achieve the above object, the utility model provides a following technical scheme:
an LNG gasification heat exchange tower comprising:
the heat exchange tower body is provided with a flue gas inlet and a flue gas outlet, the flue gas outlet is higher than the flue gas inlet, circulating water is stored at the bottom of the heat exchange tower body, and the liquid level of the circulating water is lower than that of the flue gas inlet;
the spraying layer is arranged in the heat exchange tower body and is provided with a plurality of spray heads for spraying circulating water to cover the whole cross section in the heat exchange tower body, the spraying layer is positioned between the flue gas inlet and the flue gas outlet, and flue gas in the heat exchange tower body can be in countercurrent contact with the circulating water sprayed by the spraying layer for heat exchange;
the conveying pipeline is used for conveying circulating water in the tower body of the heat exchange tower to the spraying layer, and a circulating water pump is arranged on the conveying pipeline;
and the LNG heat exchange tube bundle is used for introducing LNG, and is soaked in the circulating water of the heat exchange tower body.
Preferably, in the LNG gasification heat exchange tower, a demister used for removing water droplets carried in flue gas is further arranged in the heat exchange tower, and the demister is arranged above the spraying layer.
Preferably, in the LNG gasification heat exchange tower, the number of the circulating water pumps and the number of the spraying layers are 1 to 5, and the circulating water pumps and the spraying layers are arranged in one-to-one correspondence; the demister comprises 1-4 layers.
Preferably, in the LNG gasification heat exchange tower, the heat exchange tower body is further provided with a circulating water outlet.
Preferably, the LNG gasification heat exchange tower further comprises a chimney for guiding flue gas upwards, and the chimney is connected with the flue gas outlet.
Preferably, in the LNG gasification heat exchange tower, a chemical adding device for adjusting the pH value and the water quality of the circulating water is further included.
Preferably, in the LNG gasification heat exchange tower, the flue gas outlet is formed in the top end of the tower body of the heat exchange tower, and the opening of the flue gas outlet faces upwards.
According to the technical scheme, the LNG gasification heat exchange tower provided by the utility model comprises a heat exchange tower body, wherein a flue gas inlet and a flue gas outlet are arranged on the heat exchange tower body, the flue gas outlet is higher than the flue gas inlet, circulating water is stored at the bottom of the heat exchange tower body, and the liquid level of the circulating water is lower than the flue gas inlet; the spraying layer is arranged in the heat exchange tower body and is provided with a plurality of spray heads for spraying circulating water to cover the whole cross section in the heat exchange tower body, the spraying layer is positioned between the flue gas inlet and the flue gas outlet, and flue gas in the heat exchange tower body can be in countercurrent contact with the circulating water sprayed by the spraying layer for heat exchange; the conveying pipeline is used for conveying circulating water in the tower body of the heat exchange tower to the spraying layer, and a circulating water pump is arranged on the conveying pipeline; the LNG heat exchange tube bundle is used for introducing LNG and is soaked in the circulating water of the heat exchange tower body.
During the application, get the flue gas entry with the heat transfer tower body and connect natural gas combustion subsystem, with the import connection LNG storage tank of LNG heat transfer tube bank, export connection natural gas pipe network.
In the working process, on one hand, high-temperature flue gas generated by combustion of the natural gas combustion subsystem is conveyed into the heat exchange tower body through the flue gas inlet through the flue, in the heat exchange tower body, the flue gas is in countercurrent contact with circulating water sprayed by the spraying layer to exchange heat in the flowing process from the flue gas inlet to the flue gas outlet, heat in the flue gas is transferred to the circulating water sprayed, and meanwhile, the temperature of the flue gas is gradually reduced under the action of the circulating water. Along with the continuous heat exchange between the flue gas in the tower and the circulating water, the water vapor generated during the combustion of the natural gas is gradually cooled by the spray water, and the water vapor is separated out from the flue gas after the water vapor in the flue gas is saturated. The process of vapor evolution in the flue gas releases a large amount of latent heat of vaporization, and the part of heat is also absorbed by the circulating water. The flue gas is finally discharged from the flue gas outlet.
On the other hand, under the action of a circulating water pump, circulating water is conveyed to a spraying layer, the circulating water is sprayed into the heat exchange tower through spray heads arranged on the spraying layer, the circulating water is crushed into liquid drops with various small particle sizes under the action of the spray heads, and the liquid drops and the flue gas flow in a countercurrent contact manner to absorb heat in the flue gas. LNG is carried to LNG heat exchange tube in the follow LNG storage tank after the LNG booster pump pressure boost in. Because LNG heat exchanger tube bank direct arrangement is in the circulating water in the heat transfer tower, when LNG passes through LNG heat exchanger tube bank, releases cold volume to the circulating water through LNG heat exchanger tube bank for the circulating water temperature reduces. The LNG gains heat and the temperature gradually increases and the vaporization is completed. The gasified LNG is directly conveyed to a natural gas pipe network.
Because the utility model provides a LNG gasification heat transfer tower, the flue gas is at the flow in-process, the resistance that receives the circulating water is less, so can the operating pressure of reduction system, reduce the system pressure fluctuation, and then improve the system operation stability, and increased the area of contact of water with the high temperature flue gas, can the produced energy of deep utilization natural gas burning simultaneously, furthest utilizes the latent heat of vaporization of steam, the heat that the make full use of natural gas burning produced, and the heat exchange efficiency is improved, can also satisfy the requirement of LNG gasification in winter.
The utility model also provides a LNG gasification system, including LNG storage tank and natural gas combustion subsystem, still include the heat transfer tower, be used for with LNG in the LNG storage tank is carried for the LNG booster pump of the LNG heat exchanger tube bank of heat transfer tower, the high temperature exhanst gas outlet of natural gas combustion subsystem with the flue gas entry linkage of heat transfer tower, the heat transfer tower is any kind of LNG gasification heat transfer tower of the aforesaid, because above-mentioned LNG gasification heat transfer tower has above-mentioned effect, the LNG gasification system that has above-mentioned LNG gasification heat transfer tower has same effect, so this paper is no longer repeated.
Preferably, in the LNG vaporization system, the number of the LNG tanks is one or more.
Preferably, in the LNG gasification system, the natural gas combustion subsystem is a natural gas boiler, and a heat exchange structure capable of exchanging heat with high-temperature flue gas generated after combustion is arranged in the natural gas boiler.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an LNG gasification heat exchange tower provided by an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an LNG vaporization system according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an LNG vaporization system according to another embodiment of the present invention.
Wherein, in the above fig. 1-3:
the LNG heat exchange system comprises a LNG storage tank 1, an LNG booster pump 2, a heat exchange tower 3, a natural gas combustion subsystem 4, a heat exchange tower body 5, an LNG heat exchange tube bundle 6, a spray layer 7, a circulating water pump 8, a demister 9 and a chimney 10.
Detailed Description
The embodiment of the utility model provides a LNG gasification heat transfer tower can reduce system's operating pressure, reduces the system's pressure fluctuation, and then improves system's operating stability to improve heat exchange efficiency.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, an LNG gasification heat exchange tower provided in an embodiment of the present invention includes a heat exchange tower body 5 having a flue gas inlet and a flue gas outlet, the flue gas outlet is higher than the flue gas inlet, circulating water is stored at the bottom of the heat exchange tower body 5, and the liquid level of the circulating water is lower than the flue gas inlet; the spraying layer 7 is arranged in the heat exchange tower body 5, the spraying layer 7 is provided with a plurality of spray heads for spraying circulating water to cover the whole cross section in the heat exchange tower body 5, the spraying layer 7 is positioned between the flue gas inlet and the flue gas outlet, and flue gas in the heat exchange tower body 5 can be in countercurrent contact with the circulating water sprayed by the spraying layer 7 for heat exchange; a conveying pipeline for conveying the circulating water in the heat exchange tower body 5 to the spraying layer 7, wherein a circulating water pump 8 is arranged on the conveying pipeline; the LNG heat exchange tube bundle 6 is used for introducing LNG, and the LNG heat exchange tube bundle 6 is soaked in the circulating water of the heat exchange tower body 5.
As shown in fig. 1, LNG heat exchanger tube bundle 6 is completely covered with circulating water.
The lower part of the heat exchange tower body 5 is connected with circulating water and a circulating water pump 8 through a conveying pipeline; circulating water pump 8 arranges outside heat exchange tower body 5, and the entry links to each other with heat exchange tower body 5 internal circulating water through the pipeline, and the export links to each other with spraying layer 7 through the pipeline.
The spraying layer 7 is arranged on the upper part of the heat exchange tower body 5, each layer of spraying layer 7 is composed of a plurality of spray heads, and circulating water sprayed by each layer of spray heads can completely cover the whole section of the heat exchange tower body 5.
During the application, get the flue gas entry with heat transfer tower body 5 and connect natural gas combustion subsystem 4, with the import connection LNG storage tank 1 of LNG heat transfer tube bank 6, the exit linkage natural gas pipe network.
In the working process, on one hand, high-temperature flue gas generated by combustion of the natural gas combustion subsystem 4 is conveyed into the heat exchange tower body 5 through the flue gas inlet through the flue, and in the heat exchange tower body 5, the flue gas is in countercurrent contact with circulating water sprayed by the spraying layer 7 to exchange heat in the flowing process from the flue gas inlet to the flue gas outlet, so that heat in the flue gas is transferred to the sprayed circulating water, and meanwhile, the temperature of the flue gas is gradually reduced under the action of the circulating water. Along with the continuous heat exchange between the flue gas in the tower and the circulating water, the water vapor generated during the combustion of the natural gas is gradually cooled by the spray water, and the water vapor is separated out from the flue gas after the water vapor in the flue gas is saturated. The process of vapor evolution in the flue gas releases a large amount of latent heat of vaporization, and the part of heat is also absorbed by the circulating water. The flue gas is finally discharged from the flue gas outlet.
On the other hand, under the action of the circulating water pump 8, circulating water is conveyed to the spraying layer 7, the circulating water is sprayed into the heat exchange tower 3 through the spray heads arranged on the spraying layer 7, the circulating water is broken into liquid drops with various small particle sizes under the action of the spray heads, and the liquid drops and the flue gas flow in a countercurrent contact mode to absorb heat in the flue gas. LNG is carried to LNG heat exchanger tube bank 6 in following LNG storage tank 1 behind the pressurization of LNG booster pump 2. Because LNG heat exchanger tube bank 6 direct arrangement is in the circulating water in heat exchange tower 3, when LNG passes through LNG heat exchanger tube bank 6, releases cold volume to circulating water through LNG heat exchanger tube bank 6 for the circulating water temperature reduces. The LNG gains heat and the temperature gradually increases and the vaporization is completed. The gasified LNG is directly conveyed to a natural gas pipe network.
Because the utility model provides a LNG gasification heat transfer tower, the flue gas is at the flow in-process, the resistance that receives the circulating water is less, so can the operating pressure of reduction system, reduce the system pressure fluctuation, and then improve the system operation stability, and increased the area of contact of water with the high temperature flue gas, can the produced energy of deep utilization natural gas burning simultaneously, furthest utilizes the latent heat of vaporization of steam, the heat that the make full use of natural gas burning produced, and the heat exchange efficiency is improved, can also satisfy the requirement of LNG gasification in winter.
Preferably, a demister 9 for removing water drops carried in the flue gas is further arranged in the heat exchange tower body 5, and the demister 9 is arranged above the spraying layer 7. The demister 9 is arranged on the upper part of the heat exchange tower body 5 and is positioned on the uppermost spraying layer 7.
Along with the continuous heat exchange between the flue gas in the tower and the circulating water, the water vapor generated during the combustion of the natural gas is gradually cooled by the spray water, and the water vapor is separated out from the flue gas after the water vapor in the flue gas is saturated. The process of water vapor separation in the flue gas releases a large amount of latent heat of vaporization, and the part of heat is also absorbed by circulating water. Along with the rising of flue gas, flue gas temperature reduces gradually, finally reduces to get into defroster 9 when being equivalent with circulating water temperature, and under defroster 9's effect, the dribble that carries in the flue gas will be removed, finally descends to in the heat transfer tower 3. The residual flue gas is directly discharged into the atmosphere through a flue gas outlet.
Particularly, 1-5 circulating water pumps 8 and spraying layers 7 can be arranged and are arranged in a one-to-one correspondence manner; preferably, 2-4 circulating water pumps 8 and spraying layers 7 are arranged; the lowest layer of the spraying layer 7 is positioned above the flue gas inlet. The number of the circulating water pumps 8 and the spraying layers 7 can be other according to the actual application requirement.
Particularly, the demister 9 consists of 1-4 layers; preferably, the demister 9 consists of 2-3 layers. Other layers can be adopted for the demister 9 according to the actual application requirement.
In the LNG gasification heat exchange tower, the heat exchange tower body 5 is also provided with a circulating water outlet. The circulating water outlet is also provided with a circulating water discharge pipeline; because of the condensation of the water vapor in the flue gas in the heat exchange tower 3, when the water level in the heat exchange tower 3 gradually rises, part of circulating water can be discharged through the circulating water outlet so as to keep the liquid level in the tower stable.
The LNG gasification heat exchange tower further comprises a chimney 10 used for guiding out the flue gas upwards, and the chimney 10 is connected with the flue gas outlet. The chimney 10 is arranged on the heat exchange tower body 5, connected with the flue gas outlet and positioned above the demister 9. The flue gas is directly discharged into the atmosphere through a chimney 10 arranged at the upper part of the heat exchange tower body 5, so that the discharge of the flue gas is facilitated.
The LNG gasification heat exchange tower also comprises a dosing device for adjusting the pH value and the water quality of the circulating water. CO is generated in the combustion process of natural gas2，CO2Belongs to acid gas, and can reduce the pH value of water after being dissolved in the water, and enhance the corrosion capability of circulating water. Alkaline materials such as NaOH are added into the circulating water through a dosing device, so that the corrosion of the heat exchange tower 3 and equipment in the tower is reduced, and the running time of the system is prolonged.
In order to facilitate the flowing of the flue gas and the sufficient heat exchange with the circulating water, the flue gas outlet is arranged at the top end of the heat exchange tower body 5, and the opening of the flue gas outlet is upward. Of course, the flue gas outlet may also be arranged at a position where the flue gas outlet is arranged at one side of the heat exchange tower body 5 close to the top.
The embodiment of the utility model provides a LNG gasification system is still provided, including LNG storage tank 1 and natural gas combustion subsystem 4, still include heat transfer tower 3, a LNG booster pump 2 for carrying LNG heat transfer tube bank 6 of heat transfer tower 3 with LNG in the LNG storage tank 1, the high temperature exhanst gas outlet of natural gas combustion subsystem 4 and heat transfer tower 3's flue gas entry linkage, heat transfer tower 3 is the LNG gasification heat transfer tower that any above-mentioned embodiment provided, can reduce system's operating pressure, reduce system's pressure fluctuation, and then improve system's operating stability, and improve heat exchange efficiency, its advantage is brought by LNG gasification heat transfer tower, relevant part in the above-mentioned embodiment is referred to in concrete please, just give unnecessary details here.
In the LNG gasification system, an LNG storage tank 1 is connected with an inlet of an LNG booster pump 2, an outlet of the LNG booster pump 2 is connected with an inlet of an LNG heat exchange tube bundle 6 in a heat exchange tower 3, and an outlet of the LNG heat exchange tube bundle 6 is connected with a natural gas pipe network;
high-temperature flue gas generated by combustion of the natural gas combustion subsystem 4 is connected with a flue gas inlet of the heat exchange tower 3 through a flue;
in order to ensure that the capacity of the heat exchange tower 3 is matched with the heat required by LNG gasification, and simultaneously reduce the initial investment of the system, each set of the natural gas combustion subsystem 4 and the heat exchange tower 3 can be provided with a plurality of sets of LNG storage tanks 1 and LNG booster pumps 2 according to the LNG flow.
As shown in fig. 2, in an embodiment, each set of the natural gas combustion subsystem 4 and the heat exchange tower 3 is provided with a set of the LNG storage tank 1 and the LNG booster pump 2; in another embodiment, as shown in fig. 3, two sets of LNG storage tanks 1 and LNG booster pumps 2 are provided for each set of the natural gas combustion subsystem 4 and the heat exchange tower 3. At this moment, the LNG heat exchange tube bundles 6 in the heat exchange tower 3 can be arranged at intervals according to the number of the LNG storage tanks 1, so that the uniform distribution of the temperature of circulating water in the heat exchange tower 3 is ensured, and the heat generated by combustion of natural gas is utilized to the maximum extent.
The natural gas combustion subsystem 4 can be composed of a natural gas combustor, a natural gas distribution system, an air supply system, a combustion chamber and the like.
The natural gas combustion subsystem 4 can also be set as a natural gas boiler, and a heat exchange structure capable of exchanging heat with high-temperature flue gas generated after combustion is arranged in the natural gas boiler. The heat exchange structure can be a water wall arranged in a natural gas boiler, high-temperature high-pressure steam is generated on the heating surfaces of a superheater and the like, the high-temperature high-pressure steam is conveyed to a steam turbine to generate electricity, and the flue gas after heat exchange is introduced into the heat exchange tower 3 to realize heating and gasification of LNG. This embodiment may further reduce energy losses by utilizing the heat of the natural gas based on the temperature gradient.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. An LNG gasification heat exchange tower, comprising:
the heat exchange tower body (5) is provided with a flue gas inlet and a flue gas outlet, the flue gas outlet is higher than the flue gas inlet, circulating water is stored at the bottom of the heat exchange tower body (5), and the liquid level of the circulating water is lower than that of the flue gas inlet;
the spraying layer (7) is arranged in the heat exchange tower body (5), the spraying layer (7) is provided with a plurality of spray heads for spraying circulating water to cover the whole cross section in the heat exchange tower body (5), the spraying layer (7) is positioned between the flue gas inlet and the flue gas outlet, and flue gas in the heat exchange tower body (5) can be in countercurrent contact with the circulating water sprayed by the spraying layer (7) for heat exchange;
a conveying pipeline for conveying circulating water in the heat exchange tower body (5) to the spraying layer (7), wherein a circulating water pump (8) is arranged on the conveying pipeline;
the LNG heat exchange tube bundle (6) is used for introducing LNG, and the LNG heat exchange tube bundle (6) is soaked in the circulating water of the heat exchange tower body (5).
2. LNG gasification heat exchange tower according to claim 1, characterized in that a demister (9) for removing water droplets carried in the flue gas is further arranged in the heat exchange tower body (5), and the demister (9) is arranged above the spray layer (7).
3. LNG gasification heat exchange tower according to claim 2, characterized in that the number of circulating water pumps (8) and the number of spray levels (7) are 1-5, which are arranged in one-to-one correspondence; the demister (9) comprises 1-4 layers.
4. LNG gasification heat exchange column according to claim 2, characterized in that the column body (5) is further provided with a circulating water outlet.
5. LNG vaporizing heat exchange column according to claim 1, further comprising a chimney (10) for guiding flue gas upwards, said chimney (10) being connected to said flue gas outlet.
6. The LNG gasification heat exchange tower of claim 1, further comprising a dosing device for adjusting the pH value and the water quality of the circulating water.
7. LNG gasification heat exchange column according to claim 1, characterized in that the flue gas outlet is arranged at the top end of the column body (5) and is open upwards.
8. An LNG gasification system, comprising an LNG storage tank (1) and a natural gas combustion subsystem (4), and further comprising a heat exchange tower (3) for delivering LNG in the LNG storage tank (1) to an LNG booster pump (2) of an LNG heat exchange tube bundle (6) of the heat exchange tower (3), wherein a high-temperature flue gas outlet of the natural gas combustion subsystem (4) is connected with a flue gas inlet of the heat exchange tower (3), and the heat exchange tower (3) is the LNG gasification heat exchange tower as claimed in any one of claims 1 to 7.
9. LNG gasification system according to claim 8, characterized in that the LNG storage tanks (1) are one or more.
10. The LNG gasification system of claim 8 wherein the natural gas combustion subsystem (4) is a natural gas boiler having a heat exchange structure therein capable of exchanging heat with high temperature flue gas generated after combustion.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020509224.6U CN211977670U (en) | 2020-04-09 | 2020-04-09 | LNG gasification heat exchange tower and LNG gasification system |
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| CN202020509224.6U CN211977670U (en) | 2020-04-09 | 2020-04-09 | LNG gasification heat exchange tower and LNG gasification system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111366026A (en) * | 2020-04-09 | 2020-07-03 | 烟台龙源电力技术股份有限公司 | LNG gasification heat exchange tower and LNG gasification system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111366026A (en) * | 2020-04-09 | 2020-07-03 | 烟台龙源电力技术股份有限公司 | LNG gasification heat exchange tower and LNG gasification system |
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