WO2016093462A1

WO2016093462A1 - High pressure ambient ultra-low temperature vaporizer, and method for coupling seamless pipe and fin tube which are used in vaporizer

Info

Publication number: WO2016093462A1
Application number: PCT/KR2015/008144
Authority: WO
Inventors: 최태환; 권훈택; 최규평
Original assignee: 최태환
Priority date: 2014-12-11
Filing date: 2015-08-04
Publication date: 2016-06-16
Also published as: KR101506946B1

Abstract

The present invention relates to a high pressure ambient ultra-low temperature vaporizer, and a method for coupling a seamless pipe and a fin tube which are used in the vaporizer. The vaporizer comprises: a seamless pipe through which a high pressure ultra-low temperature liquid gas passes; and a fin tube which is coupled to the circumference of the seamless pipe and allows heat exchange to be performed between the seamless pipe and the atmosphere. The fin tube consists of: a coupling boss adhered to the circumference of the seamless pipe; and a plurality of heat-radiating fans which are radially formed on the circumference of the coupling boss. Accordingly, if a liquid-state ultra-low temperature gas such as LNG, industrial gas, etc. passes through the seamless pipe, the liquid-state ultra-low temperature gas is changed to a gaseous state since the temperature of the ultra-low temperature gas is increased while heat conduction between the coupling boss and the heat-radiating fans of the fin tube, and the seamless pipe occurs. Therefore, since a plurality of heat-radiating fans are radially arranged on the circumference of the coupling boss of the fin tube, the heat release effect is excellent. In addition, since the contact area between the atmosphere and the heat-radiating fans is maximized due to the radially arranged heat-radiating fans and heat-radiating grooves on the surfaces of the heat-radiating fans, the performance of the vaporizer is improved.

Description

High Pressure Atmospheric Cryogenic Gas Vaporizer and Seamless Tube and Fin Tube Coupling Method

The present invention relates to a high pressure atmospheric cryogenic gas vaporizer and a seamless tube, a fin tube coupling method used in the vaporizer, and more specifically, the seamless tube is a high-pressure cryogenic fluid flowing tube safety for high pressure use The high pressure atmospheric cryogenic gas vaporizer and the seamless tube used for the vaporizer, in which the heat dissipation effect of the seamless tube is improved, and the seamless tube and the fin tube are closely contacted without welding. , To a method for coupling a fin tube.

Liquefied gas is a gas that can be liquefied at a specific temperature (zero minus -196 ~ 50 ℃) at a relatively low pressure at a commercial temperature such as LNG, liquefied oxygen, liquefied nitrogen, liquefied argon, liquefied ammonia, liquefied carbon dioxide gas, and liquefied ethylene oxide. Refers to a liquid gas that is liquefied and stored in a container or used for a specific purpose.

In addition, the vaporizer is a device for vaporizing the cryogenic liquefied gas automatically or forcibly discharged from the liquefied gas storage tank, the liquefied gas vaporized in the vaporizer is supplied to the consumer in a gaseous state, and sometimes used to fill the pressure vessel.

In order to use the cryogenic liquefied gas at the consumer, it is necessary to secure a certain temperature condition. However, in order to ensure a constant temperature condition, the heating and heat dissipation system must be properly harmonized, and external conditions must be met.

The vaporizer according to the prior art is commonly used by erecting a plurality of pipes, installing a partition chamber or a manifold on the upper and lower parts thereof, and welding and fixing them. LNG and industrial cryogenic liquefied gas are first supplied from the lower part of the vaporizer. As the temperature of the inner fluid rises due to heat exchange due to the outside temperature, the heat fins and the temperature difference, the vaporized gas is sent to the place of use through the upper manifold or partition chamber.

Since the heat exchanger tube is welded and fixedly connected to the upper and lower tube plates, when the degree of warming is changed by the amount of LNG and industrial cryogenic gas supplied, the heat transfer tube is stretched and the thermal stress is applied to the welding position with the tube plate. As a result, if the feeding amount continues to change, this thermal stress is repeated, and at the end, the weld part fixed to the tube plate by thermal fatigue breaks. In addition, since there are a plurality of heat transfer tubes, when the liquid dispersion of LNG in this inside is bad, the temperature difference of each welding part fixed to the tube plate will generate | occur | produce, a distortion will arise in a tube plate, and the said heat fatigue will be accelerated.

This problem also occurs in a vaporizer in which a heat transfer pipe is welded and fixed to a manifold corresponding to the tube plate.

In the case of adopting an alloyed aluminum material as the material of the heat transfer tube, if there is a difference in temperature difference of 100 ° C., a difference in the amount of expansion and contraction of 2.3 mm occurs per 1 m, and in a heat transfer tube made of stainless steel, there is a difference in the amount of extension of 1.5 mm per 1 m. In iron heat transfer tubes, the difference in the amount of expansion and contraction of 1.2 mm per 1 m occurs. For this reason, excessive stress was applied to the welded portion, and if the intermittent operation of the carburetor often caused a problem of cracking at the welded portion.

An object of the present invention for solving the above-mentioned problems is a high-pressure atmospheric cryogenic gas vaporizer and a shim used in the vaporizer, the heat dissipation effect of the seamless tube is improved, and the contact area between the atmosphere and the heat dissipation wing is maximized. It is to provide a method of coupling the tube, pin tube.

It is still another object of the present invention that, when air is blown by a blower fan, some of the air is guided to the four corners of the diffuser by the air deflector, so that the blown air is diffused evenly through the opening of the diffuser. The present invention provides a cryogenic gas vaporizer and a seamless tube and fin tube joining method used in the vaporizer.

Still another object of the present invention is to provide a high-pressure atmospheric cryogenic gas vaporizer and a seamless tube and fin tube joining method for use in the vaporizer, in which the seamless tube and the fin tube are closely attached by drawing or pressure molding without welding. It is.

In order to achieve the above object, the high-pressure atmospheric cryogenic gas vaporizer of the present invention includes a high-pressure atmospheric cryogenic gas vaporizer for supplying a liquid cryogenic gas such as LNG and industrial gas into a vaporized state, the vaporizing framework; A seamless tube installed in the vaporization framework and passing a high pressure cryogenic liquid gas; A manifold installed in the vaporization framework and connected to the seamless pipe; It comprises a fin tube coupled to the circumference of the seamless tube and allowing heat exchange to occur in the atmosphere with the seamless tube; The fin tube is characterized by consisting of a coupling boss that is in close contact with the circumference of the seamless tube, and a plurality of radiating wings formed radially around the coupling boss.

Another characteristic of the high-pressure atmospheric cryogenic gas vaporizer of the present invention is that the seamless tube is made of austenitic stainless steel, and the fin tube is made of aluminum alloy or an austenitic stainless steel.

Another feature of the high-pressure atmospheric cryogenic gas vaporizer for the present invention, the heat radiation grooves are formed in the longitudinal direction around the heat radiation wing.

Another feature of the high-pressure atmospheric cryogenic gas vaporizer of the present invention is a heat flash prevention part is installed in the lower part of the vaporization framework, the heat flash prevention part, between the blow fan and the blow fan and the fan tube to blow air to the fin tube side It is installed in the diffuser to diffuse the air supplied by the blower fan, and is installed in the diffuser between the blower fan and the fin tube so that the air flowing to the fin tubes is uniformly blown to the plurality of fin tubes to improve the heat transfer performance of the air. Consisting of an air deflector; The air deflector is installed to be inclined inside the diffuser so that one end faces the inner center side of the diffuser and the other end faces the outer circumference of the diffuser, so that some of the cooling air blown by the blower fan is guided toward the circumference of the open portion of the diffuser. ; Four radially inside one diffuser installed in one blower fan, a portion of the air is provided to guide the four corners of the diffuser.

The seamless tube, the fin tube coupling method used in the high-pressure atmospheric cryogenic gas vaporizer of the present invention for achieving the same object as described above, is installed on the vaporization framework, the vaporization framework and supplied with a high-pressure cryogenic liquid gas and austenite Seamless stainless steel material, a manifold installed in the vaporization framework and connected to the seamless pipe, coupled to the seamless pipe to allow heat exchange between the seamless pipe and the atmosphere, and aluminum alloy or austenitic A method of coupling a seamless tube and a fin tube in a high pressure atmospheric cryogenic gas vaporizer comprising a fin tube made of stainless steel, comprising: a temporary coupling step of inserting a seamless tube into a coupling boss of the fin tube; A seamless tube sealing step of sealing the inside of the seamless tube by connecting a plug to one end of the seamless tube and connecting a high pressure device to the other end of the seamless tube; A seamless pipe pressurizing step of injecting pressure into the seamless pipe into the seamless pipe to increase the pressure to the set pressure; A pipe joint step of expanding the inside of the seamless tube with an increased internal pressure so that the outer peripheral surface of the seamless tube is in close contact with the inner peripheral surface of the coupling boss of the fin tube; An internal pressure releasing step of stopping the increase in pressure when the internal pressure of the seamless pipe is increased and opening a stopper to drain the fluid inside the seamless pipe; After releasing the internal pressure of the seamless tube is characterized in that the drying step of drying the interior of the seamless tube.

The present invention as described above comprises a seamless tube through which the high-pressure cryogenic liquid gas passes, and a fin tube coupled to the circumference of the seamless tube and allowing heat exchange to occur in the atmosphere with the seamless tube. The fin tube is composed of a coupling boss that is in close contact with the circumference of the seamless tube, and a plurality of heat dissipating wings formed radially around the coupling boss. Therefore, when liquid cryogenic gas, such as LNG and cryogenic industrial gas, passes through the seamless tube, heat conduction occurs between the coupling boss of the fin tube and the heat dissipation blades and the seamless tube, and thus the temperature of the cryogenic gas is increased to the vaporized state. Change. Therefore, since the heat dissipation wings are arranged radially around the coupling boss of the fin tube, the heat dissipation effect is excellent, and the contact area between the air and the heat dissipation wing is maximized by the heat dissipation blades arranged radially and the heat dissipation grooves on the heat dissipation wing surface. The performance of the carburetor is improved.

In the lower part of the vaporization frame of the present invention, a blower fan for blowing air to the fin tube side, a diffuser disposed between the blower fan and the fin tube to diffuse the air supplied by the blower fan, and a diffuser between the blower fan and the fin tube It is installed in the inside of the heat flow prevention portion made of an air deflector to improve the heat transfer performance of the air by allowing the air flowing toward the fin tubes to be uniformly blown through the plurality of fin tubes. Therefore, when the air is blown by the blower fan, part of the air is guided to the four corners of the diffuser by the air deflector, and the air blown by the blower fan is diffused evenly through the opening of the diffuser. It is evenly distributed throughout the tube. Therefore, the air flows uniformly through the fin tube, thereby improving the performance of the vaporizer.

The seamless tube and fin tube coupling of the present invention inserts the seamless tube into the coupling boss of the fin tube, injects a pressure into the sealed seamless tube with a high pressure pump, and raises the setting pressure to increase the internal pressure. By expanding the inside of the seamless tube to the outer peripheral surface of the seamless tube is made to be in close contact with the inner peripheral surface of the coupling boss of the pin tube. Therefore, the seamless tube and the fin tube are fixed without being welded separately, so that a high temperature cryogenic liquid gas is vaporized, so that even if an extreme temperature deviation occurs, cracks do not occur at the joint.

1 is a schematic perspective view showing a high-pressure atmospheric cryogenic gas vaporizer of the present invention

Figure 2 is a perspective view showing a state in which the seamless tube and the fin tube is coupled

3 is a partial cutaway perspective view of FIG.

Figure 4 is a schematic front view showing a state in which the heat island prevention portion is installed in the lower portion of the vaporization framework

Figure 5 is a schematic side cross-sectional view showing a heat island prevention portion

6 is a schematic plan view of FIG.

7 is a flowchart sequentially showing a process of coupling the seamless tube and the fin tube

Specific features and advantages of the present invention will become more apparent from the following description with reference to the accompanying drawings.

1 is a schematic perspective view showing a high-pressure atmospheric cryogenic gas vaporizer of the present invention, Figure 2 is an excerpt perspective view showing a state in which the seamless tube and the fin tube is coupled, Figure 3 is a partial cutaway perspective view of FIG. FIG. 4 is a schematic front view showing a state where a heat island prevention part is installed at a lower part of the vaporization framework, FIG. 5 is a side view schematically showing a heat island prevention part, and FIG. 6 is a schematic plan view of FIG.

The high-pressure atmospheric cryogenic gas vaporizer of the present invention is an equipment for changing and supplying liquid cryogenic gas such as LNG and industrial gas into a vaporized state.

Vaporizer of the present invention in the liquid state, such as LNG (liquefied natural gas) and industrial gas (liquefied oxygen, liquefied nitrogen, liquefied argon, liquefied carbon dioxide, liquefied ethylene oxide, liquefied ammonia) used from minus 50 ℃ to minus 200 ℃ It is a device to change the cryogenic gas into vaporization state, and it is applied to the facility using the ultra high pressure of the minimum pressure of 5MPa or more.

The material of the fin tube 40 for heat exchange between the cryogenic fluid and the atmosphere is aluminum alloy (A6061, A6163, A6063) and austenitic stainless steel (STS304, STS304L, STS316, STS316L).

The inner pipe through which the high-pressure cryogenic liquid flows is made of austenitic stainless steel, and the seamless pipe 20 is used.

In order to maximize the heat exchange efficiency, the fin tube 40 uses 4, 8, 12, 16, etc., and the length and total heat transfer area are changed depending on the total amount of fluid used.

The high pressure atmospheric cryogenic gas vaporizer of this invention consists of a vaporization frame 10, the seamless pipe 20, the manifold 30, and the fin tube 40. As shown in FIG.

The vaporization frame 10 is provided with a seamless tube 20, a manifold 30, and a fin tube 40 which will be described later.

The seamless tube 20 is installed in the vaporization framework 10 and passes a high pressure cryogenic liquid gas. The seamless tube 20 is made of austenitic stainless steel as described above.

The manifold 30 is installed in the vaporization framework 10 and connected to the seamless pipe 20.

The fin tube 40 is coupled to the circumference of the seamless tube 20 to allow heat exchange with the seamless tube 20 in the atmosphere. The fin tube 40 is made of an aluminum alloy tube AL or an austenitic stainless steel material.

Here, the fin tube 40 is composed of a coupling boss 41 in close contact with the circumference of the seamless tube 20, and a plurality of radiating wings 42 formed radially around the coupling boss 41. The heat dissipation grooves 43 are formed in the longitudinal direction of the heat dissipation blade 42.

On the other hand, the lower portion of the vaporization framework 10, the bar may be provided with a heat flash prevention unit 50, the heat flash prevention unit 50, the blowing fan 51 for blowing air to the fin tube 40 side, The diffuser 52 which is installed between the blowing fan 51 and the fin tube 40 to diffuse the air supplied by the blowing fan 51 and the diffuser 52 between the blowing fan 51 and the fin tube 40. The air deflector 53 is installed in the airflow tube to improve the heat transfer performance of the air by allowing the air flowing toward the fin tubes 40 to be uniformly blown through the plurality of fin tubes 40.

Here, the air deflector 53 is inclined in the diffuser 52 so that one end faces the inner center side of the diffuser 52 and the other end faces the outer circumference of the diffuser 52, and is blown by the blower fan 51. Some of the air blown is provided to be directed toward the circumference of the opening of the diffuser 52.

Four air deflectors 53 are provided radially inside one diffuser 52 installed in one blower fan 51 so that a part of the air is guided to the four corner portions of the diffuser 52. .

On the outside of the diffuser 52 through which air is discharged, a reinforcement table 54 is provided to support the air deflector 53 provided inside the diffuser 52. This reinforcement stand 54 is formed in a circular pipe shape so as not to disturb the flow of air.

Therefore, since the air deflector 53 is firmly supported by the reinforcing bar 54, the air deflector 53 does not escape from the diffuser 52 even when the heat island prevention part 50 of the present invention is used for a long time.

The reinforcing table 54 of the present invention has a circular pipe shape and is provided in an X shape on the outside of the diffuser 54. The reinforcing bar 54 of the circular pipe shape installed as described above does not disturb the flow of air, and thus the pressure drop of the air is hardly generated.

7 is a flowchart sequentially showing a process of coupling the seamless tube and the fin tube. High-pressure atmospheric cryogenic gas vaporizer of the present invention described above is characterized in that the coupling of the seamless tube 20 and the fin tube 40, these combinations are made as shown in FIG.

First, it has a temporary coupling step (S10) for inserting the seamless tube 20 into the coupling boss 41 of the fin tube (40).

When the fin tube 40 and the seamless tube 20 are combined, a high pressure pump (not shown) is connected to one end of the seamless tube 20, and a plug (not shown) is connected to the other end of the seamless tube 20. Coupled to have a seamless pipe sealing step (S20) to seal the inside of the seamless pipe 20.

When the seamless pipe 20 is sealed, the seamless pipe pressurizing step (S30) of injecting pressure into the seamless pipe 20 with a high-pressure pump to raise the pressure to the set pressure inside the seamless pipe 20 (S30). Has

Pressing the inside of the seamless tube 20 expands the inside of the seamless tube 20 with an increased internal pressure so that the outer circumferential surface of the seamless tube 20 is in close contact with the inner circumferential surface of the coupling boss 41 of the fin tube 40. It has a pipe joint step (S40).

When the internal pressure of the seamless pipe 20 rises above the set pressure, the internal pressure release step (S50) of stopping the high-pressure pump and opening the stopper to drain the fluid inside the seamless pipe 20 is performed.

After releasing the internal pressure of the seamless tube 20 has a drying step (S60) for drying the interior of the seamless tube 20.

The high pressure atmospheric cryogenic gas vaporizer of the present invention has the following advantages.

First, the present invention is connected to the seamless tube 20, the seamless tube 20 through which the high-pressure cryogenic liquid gas is passed, and the fin tube 40 for heat exchange in the air with the seamless tube 20. ) The fin tube 40 is composed of a coupling boss 41 in close contact with the circumference of the seamless tube 20, and a plurality of heat dissipation blades 42 radially formed around the coupling boss 41.

Therefore, when liquid cryogenic gas such as LNG and industrial gas passes through the seamless tube 20, heat conduction is performed between the coupling boss 41 of the fin tube 40 and the heat dissipation blades 42 and the seamless tube 20. As the temperature of the cryogenic gas rises, the gas is changed into a vaporized state.

Therefore, since the heat dissipation blades 42 are arranged radially around the coupling boss 41 of the fin tube 40, the heat dissipation effect is excellent, and the heat dissipation of the surfaces of the heat dissipation blades 42 and the heat dissipation blades 42 arranged radially. By the grooves 43, the contact area between the atmosphere and the heat dissipation blade 42 is maximized, thereby improving the performance of the vaporizer.

Second, in the lower part of the vaporization framework 10 of the present invention, a blowing fan 51 for blowing air toward the fin tube 40 side, and is installed between the blowing fan 51 and the fin tube 40 to blow the fan 51 A plurality of fin tubes (2) installed in the diffuser (52) for diffusing the air supplied by the air blower (51) and between the blower fan (51) and the fin tube (40) and flowing toward the fin tubes (40). 40 is provided with a heat deterioration preventing portion 50 made of an air deflector 53 for uniformly blowing the air to improve the heat transfer performance of the air.

Therefore, when the air is blown by the blower fan 51, a part of the air is guided to the four corners of the diffuser 52 by the air deflector 53, and the air blown by the blower fan 51 is diffuser 52. It is spread evenly throughout the opening of the), and is thus evenly supplied throughout the plurality of fin tubes (40).

Therefore, the air flows uniformly throughout the fin tube 40, thereby improving the performance of the vaporizer.

Third, the seamless tube 20 and the fin tube 40 of the present invention, the seamless tube 20 is inserted into the coupling boss 41 of the fin tube 40, the sealed seamless tube 20 By injecting pressure into the high-pressure pump therein, the pressure is increased to the set pressure, and the inner circumferential surface of the seamless tube 20 is expanded by the expansion of the seamless tube 20 by the increased internal pressure. It is made to be in close contact with the inner circumferential surface.

Therefore, since the seamless tube 20 and the fin tube 40 are tightly fixed without additional welding, cracks do not occur at the joint even when extreme temperature deviation occurs while the high-pressure cryogenic liquid gas is vaporized.

Meanwhile, the anti-wear coating layer may be coated on the inlet 31 of the manifold 30 to which the high pressure is applied.

In this antiwear coating layer, 96 to 98% by weight of chromium oxide (Cr ₂ O ₃ ) and ₂ to 4% by weight of titanium dioxide (TiO ₂ ) are mixed and the powder is sprayed around the inlet 31 of the manifold 30. It is made, the thickness of 50 to 600 ㎛, the hardness is plasma coated to maintain 900 to 1000 HV.

This anti-wear coating layer is formed by spraying a powder obtained by mixing 96 to 98% by weight of chromium oxide (Cr ₂ O ₃ ) and ₂ to 4% by weight of titanium dioxide (TiO ₂ ).

The reason for the ceramic coating around the inlet 31 of the manifold 30 is mainly to prevent wear and corrosion. Ceramic coatings are more resistant to corrosion, scratch, abrasion, impact and durability than chromium or nickel chromium plating.

Chromium oxide (Cr ₂ O ₃ ) serves to prevent rust by acting as a passivity layer that blocks oxygen invading into the metal.

Titanium dioxide (TiO ₂ ) is very stable physicochemically and has a high hiding power, thus becoming a white pigment. In addition, the refractive index is high, it is widely used in high refractive index ceramics. It has photocatalytic and superhydrophilic properties. Titanium dioxide (TiO ₂ ), air purification, antibacterial, harmful substance decomposition, pollution prevention function, discoloration prevention function. The titanium dioxide (TiO ₂ ), the anti-wear coating layer is reliably coated around the inlet 31 of the manifold 30, and decomposes and removes the foreign matter attached to the anti-wear coating layer to prevent damage to the anti-wear coating layer. .

Here, when chromium oxide (Cr ₂ O ₃ ) and titanium dioxide (TiO ₂ ) are mixed and used, the mixing ratio thereof is titanium oxide (TiO ₂ ) 2 in 96 to 98% by weight of chromium oxide (Cr ₂ O ₃ ). It is preferable that -4 weight% is mixed.

When the mixing ratio of chromium oxide (Cr ₂ O ₃ ) is less than 96-98%, the coating of chromium oxide (Cr ₂ O ₃ ) is often broken in an environment such as high temperature, and thus the manifold 30 The antirust effect around the inlet 31 of the abruptly fell.

When the mixing ratio of titanium dioxide (TiO ₂ ) is less than 2 to 4% by weight, the effect of titanium dioxide (TiO ₂ ) was so small that the purpose of mixing it with chromium oxide (Cr ₂ O ₃ ) is faded. That is, titanium dioxide (TiO ₂ ) decomposes and removes foreign matter adhering around the inlet 31 of the manifold 30 to prevent corrosion or damage around the inlet 31 of the manifold 30. If less than 2 to 4% by weight, there is a problem that takes a long time to decompose the adhered foreign matter.

The coating layer made of these materials has a thickness of 50 to 600 μm around the periphery 31 of the manifold 30, and is plasma coated to maintain a hardness of 900 to 1000 HV and a surface roughness of 0.1 to 0.3 μm. .

The antiwear coating layer is sprayed at 50 to 600 µm by jetting the powdered powder and the gas at 1400 ° C. around the inlet 31 of the manifold 30 at a speed of about Mach 2.

When the thickness of the anti-wear coating layer is less than 50 μm, the effect of the above-described ceramic coating layer is not guaranteed. When the thickness of the anti-wear coating layer exceeds 600 μm, the above-mentioned effect is insignificant, but due to excessive ceramic coating. There is a problem in that work time and material costs are wasted.

The temperature around the inlet 31 of the manifold 30 is raised while the anti-wear coating layer is coated around the inlet 31 of the manifold 30, preventing deformation around the inlet 31 of the heated manifold 30. If possible, around the inlet 31 of the manifold 30 is cooled by a cooling device (not shown) to maintain a temperature of 150 ~ 200 ℃.

The sealing material made of chromic anhydride (CrO ₃ ) made of a metallic glass quartz system may be further coated around the wear protection coating layer. Chromic anhydride is applied around the coating layer made of chromium nickel powder as the inorganic sealing material.

Chromic anhydride (CrO ₃ ) is used in places requiring high wear resistance, lubricity, heat resistance, corrosion resistance, and releasability, and does not discolor in the air, has great durability, and has good wear resistance and corrosion resistance. As for the coating thickness of a sealing material, about 0.3-0.5 micrometer is preferable. When the coating thickness of the sealing material is less than 0.3㎛, the sealing material is easily peeled off and peeled even in a slight scratch groove, so that the above-described effects cannot be obtained. If the coating thickness of the sealing material is thick enough to exceed 0.5㎛, there are many pin holes, cracks, etc. in the plating surface. Therefore, the coating thickness of the sealing material is preferably about 0.3 to 0.5㎛.

Therefore, since a coating layer having excellent wear resistance and oxidation resistance is formed around the inlet 31 of the manifold 30, wear or oxidation around the inlet 31 of the manifold 30 is prevented, thereby extending the life of the product.

In addition, the manifold 30 may be made of nodular cast iron. The nodular cast iron is heated to 1600-1650 ° C. to form a molten metal, followed by desulfurization treatment. The spheroidizing agent containing about 0.3 to 0.7% by weight of magnesium is added thereto, followed by a spheroidizing treatment at 1500 to 1550 ° C., followed by heat treatment.

Since nodular cast iron is cast iron in which graphite is spherically crystallized in the solidification process by adding magnesium or the like to the molten iron of ordinary gray cast iron, the form of graphite is spherical compared to gray cast iron. Since the nodular cast iron has a small notch effect, stress concentration is reduced, and strength and toughness are greatly improved.

In the manifold 30 of the present invention, the nodular cast iron is heated to 1600 to 1650 ° C. to form a molten metal, followed by desulfurization treatment, and a spheroidizing treatment containing about 0.3 to 0.7 wt% of magnesium is added to the spheroidizing treatment at 1500 to 1550 ° C. It is made by heat treatment after implementation.

Here, when the nodular cast iron is heated to less than 1600 ° C, the entire structure is not sufficiently melted, and if it is heated above 1650 ° C, energy is unnecessarily wasted. Therefore, it is preferable to heat nodular cast iron at 1600-1650 degreeC.

In the molten nodular cast iron, a spheroidizing agent containing about 0.3 to 0.7% by weight of magnesium is added. When the magnesium content is less than 0.3% by weight, the spheroidizing agent is insignificant. On the other hand, there is a problem that the expensive material cost is increased, while it is not greatly improved. Therefore, the magnesium mixing ratio of the spheroidizing agent is suitably about 0.3 to 0.7% by weight.

When a spheroidizing agent is added to the molten nodular cast iron, it is spheroidized at 1500 to 1550 ° C. If the spheroidization treatment temperature is less than 1500 ° C., the spheroidization treatment is not performed properly. If the spheroidization treatment temperature is higher than 1550 ° C., the spheroidization treatment effect is not greatly improved, but energy is unnecessarily waste. Therefore, the spheroidization treatment temperature is preferably 1500 to 1550 ° C.

As described above, since the manifold 30 of the present invention is made of nodular cast iron, since the notch effect is small, the stress concentration phenomenon is reduced and the strength and toughness are greatly improved.

The vaporization framework 10 may be formed of a polypropylene resin composition having excellent impact resistance against external impact or external environment. The polypropylene resin composition comprises a polypropylene random block copolymer composed of 75 to 95% by weight of ethylene-propylene-alpha olefin random copolymer and 5 to 25% by weight of ethylene-propylene block copolymer having an ethylene content of 20 to 50% by weight. It may include.

The polypropylene random block copolymer is preferably 75 to 95% by weight of the above-mentioned ethylene-propylene-alpha olefin random copolymer and 5 to 25% by weight of the ethylene-propylene block copolymer, ethylene-propylene-alpha olefin random copolymer Is less than 75% by weight, the rigidity is lowered, when it exceeds 95% by weight, impact resistance is lowered, when the ethylene-propylene block copolymer is less than 5% by weight, impact resistance is lowered, when it exceeds 25% by weight, the rigidity is lowered do.

The ethylene-propylene-alpha olefin random copolymer comprises 0.5 to 7% by weight of ethylene and 1 to 15% by weight of alpha olefin having 4 to 5 carbon atoms, and maintains mechanical rigidity and heat resistance of the polypropylene resin composition and whitening resistance Play an effective role in maintaining The ethylene content is preferably 0.5 to 5% by weight, more preferably 1 to 3% by weight, and less than 0.5% by weight of whitening resistance is lowered, when it exceeds 7% by weight the crystallinity and rigidity of the resin Degrades. In addition, the alpha olefin means any alpha olefin except ethylene and propylene, preferably butene. In addition, when the above-mentioned alpha olefin has less than 4 or more than 5 carbon atoms, it is difficult to prepare a copolymer due to low reactivity with a comonomer when preparing a random copolymer. In addition, it includes 1 to 15% by weight of the above-mentioned alpha olefin, preferably 1 to 10% by weight, more preferably 3 to 9% by weight. If the alpha olefin is less than 1% by weight, the degree of crystallinity is higher than necessary to increase the transparency, and if the alpha olefin is more than 15% by weight, the degree of crystallinity and rigidity is lowered and heat resistance is significantly lowered.

In addition, the ethylene-propylene block copolymer contains 20 to 50% by weight of ethylene, and imparts impact resistance to the polypropylene resin composition and enables fine dispersion to serve to simultaneously provide whitening resistance and transparency. The ethylene content may be preferably 20 to 40% by weight, and less than 20% by weight may lower the impact resistance, while more than 50% by weight may reduce the impact resistance and the whitening resistance.

Since the polypropylene resin composition is coated around the vaporization frame 10 as described above, impact resistance and whitening resistance to external impact or external environment are improved, thereby extending the life of the product.

In addition, a thermochromic layer whose color changes with temperature may be applied to one outer surface of the vaporization framework 10.

The temperature change layer is a step of determining the temperature change by two or more thermochromic material that changes color when the temperature is above a predetermined temperature is coated on the surface of the vaporization frame 10 and separated into two or more sections according to the temperature change The protective film layer may be coated on the thermochromic layer to prevent the thermochromic layer from being damaged.

Here, the color change layer is for detecting the temperature change of the paint by changing the color according to the temperature of the vaporization framework (10). The thermochromic layer may be formed by coating a surface of the vaporization frame 10 with a thermochromic material that changes color when a temperature is higher than a predetermined temperature.

Thermochromic material is generally composed of a microcapsule structure of 1 ~ 10㎛, it can be colored and transparent due to the binding and separation phenomenon depending on the temperature of the electron donor and the electron acceptor in the microcapsules.

In addition, the temperature change material may change color quickly and have various color changes, and the color change temperature may be easily adjusted in various ways. Such thermochromic materials may be used in various kinds of thermochromic materials based on principles such as molecular rearrangement of organic compounds and rearrangement of atomic groups.

To this end, the thermochromic layer is preferably formed to coat two or more thermochromic materials having different discoloration temperatures into two or more sections according to temperature changes. It is preferable to use a thermochromic material having a relatively low temperature discoloration temperature and a thermochromic material having a relatively high temperature discoloration temperature, and the temperature discoloration layer having a discoloration temperature reacting at two different temperatures. The material can be used to form the thermochromic layer.

Through this, it is possible to check the temperature change of the vaporization framework (10) step by step to detect the temperature change of the paint, thereby grasping the temperature around the vaporization framework (10). The thermochromic layer can indirectly determine whether the liquid cryogenic gas is vaporized smoothly at the optimum temperature in the vaporizer.

The protective layer is coated on the thermochromic layer to prevent the thermochromic layer from being damaged by an external impact, and it is easy to check whether the thermochromic layer is discolored, and at the same time, it has a heat insulating effect considering that the thermochromic material is weak to heat. It is preferable to use a coating material.

Claims

In the high pressure atmospheric cryogenic gas vaporizer which supplies liquid cryogenic gas, such as LNG and industrial gas, to the vaporization state, and supplies it,

Vaporization framework (10);

A seamless tube 20 installed in the vaporization framework 10 and having a high pressure cryogenic liquid gas therethrough;

A manifold 30 installed on the vaporization framework 10 and connected to the seamless pipe 20;

A fin tube 40 coupled to the periphery of the seamless tube 20 to allow heat exchange with the seamless tube 20 in the atmosphere;

The fin tube 40,

High pressure atmospheric cryogenic gas vaporizer, characterized in that made of a coupling boss 41 in close contact with the circumference of the seamless tube 20, and a plurality of radiating wings 42 formed radially around the coupling boss 41.
The method according to claim 1,

The seamless tube 20 is made of austenitic stainless steel,

Fin tube 40 is a high-pressure atmospheric cryogenic gas vaporizer, characterized in that made of aluminum alloy or an austenitic stainless steel material.
The high-temperature atmospheric cryogenic gas vaporizer of claim 1, wherein heat dissipation grooves 43 are formed around the heat dissipation blade 42 in the longitudinal direction.
The method according to claim 1,

On the lower part of the vaporization framework 10 is installed a heat flash prevention unit 50,

The heat flash prevention unit 50 is provided between a blowing fan 51 for blowing air to the fin tube 40 side, and is provided between the blowing fan 51 and the fin tube 40 to be supplied by the blowing fan 51. Diffuser 52 and diffuser 52 for spreading the air, and the air flowing to the fin tubes 40 in the diffuser 52 between the blower fan 51 and the fin tube 40 is uniformly blown to the plurality of fin tubes 40. An air deflector 53 for improving the heat transfer performance of the air;

Air deflector 53,

One end is inclined inside the diffuser 52 so that one end faces the inner center side of the diffuser 52 and the other end faces the outer circumference of the diffuser 52 so that some of the air blown by the blower fan 51 is diffuser 52. Is guided to the circumferential side of the opening; Four radially installed inside one diffuser 52 installed in one blower fan 51, so that a part of the air is guided to the four corners of the diffuser 52, characterized in that the atmospheric ultra-low temperature gas for high pressure carburetor.
A vaporization base, a seamless tube made of austenitic stainless steel, supplied with a high-pressure cryogenic liquid gas provided on the vaporized base, a manifold installed on the vaporized base and connected to the seamless tube, and around the seamless tube A method of coupling a seamless tube and a fin tube in a high pressure atmospheric cryogenic gas vaporizer comprising a fin tube made of an aluminum alloy or an austenitic stainless steel. ,

Provisional coupling step (S10) for inserting the seamless tube 20 into the coupling boss 41 of the fin tube 40;

Connecting the high pressure pump to one end of the seamless pipe 20 and connecting the stopper to the other end of the seamless pipe 20 to seal the seamless pipe sealing step (S20) to seal the inside of the seamless pipe 20;

A seamless pipe pressurizing step (S30) of injecting pressure into the seamless pipe (20) with a high pressure pump to raise the pressure to the set pressure inside the seamless pipe (20);

A pipe joint step (S40) of expanding the inside of the seamless tube 20 with an increased internal pressure such that the outer circumferential surface of the seamless tube 20 is in close contact with the inner circumferential surface of the coupling boss 41 of the fin tube 40;

An internal pressure releasing step (S50) of stopping the high pressure pump and opening a stopper to drain the fluid inside the seamless tube 20 when the internal pressure of the seamless tube 20 is increased (S50);

Simless tube, pin used for high-pressure atmospheric cryogenic gas vaporizer, characterized in that the drying step (S60) for releasing the internal pressure of the seamless tube 20 and then drying the inside of the seamless tube 20 Tube joining method.