KR101787466B1 - Defrost heater for cryogenic gas vaporizer and heat exchange method of this defrost heater - Google Patents

Abstract

A defrost heater for a cryogenic gas vaporizer, and a heat exchange method of the defrost heater.
Among them, the defrost heater for a cryogenic gas vaporizer is a defrost heater for a cryogenic gas vaporizer which periodically applies heat to a fin tube of a cryogenic gas vaporizer which is supplied with LNG and an industrial gas in a vaporized state in a liquid state cryogenic gas, The defrost heater includes an end plate; A support plate installed at a predetermined distance from the end plate; A first housing which seals between the end plate and the support plate and has a refrigerant inlet port through which a refrigerant flows and an outlet through which a refrigerant is discharged; A first baffle dividing the inner space of the first housing into upper and lower portions to block mixing of the refrigerant flowing through the refrigerant inlet port and the refrigerant discharged to the refrigerant outlet port; One end of which is supported by the upper region of the support plate and communicates with the upper space of the first housing, the longitudinal middle portion is bent into a U-shape, and the other end is supported by the lower region of the support plate, A plurality of refrigerant tubes which are refrigerant channels communicating with the lower space; A second housing provided with a heat medium inlet port through which the heat medium as a heat exchange object is introduced and a heat medium exhaust port through which the heat medium is discharged, And a second baffle for placing the upper portion of the refrigerant tube in an upper space of the second housing and dividing the inner space of the second housing into upper and lower portions so that the lower portion of the refrigerant tube is located in the lower space .

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a defrost heater for a cryogenic gas vaporizer and a defrost heater for a cryogenic gas vaporizer,

The present invention relates to a defrost heater for a cryogenic gas vaporizer and a method for heat exchange between the defrost heater and the defrost heater. More particularly, the present invention relates to a cryogenic temperature gas vaporizer A defrost heater, and a defrost heater.

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

The vaporizer is a device for vaporizing ultra low temperature liquefied gas discharged automatically or forcibly from a liquefied gas storage tank. The liquefied gas vaporized in the vaporizer is supplied to the customer in a gaseous state, and sometimes to a pressure vessel.

In order to use cryogenic liquefied gas at the consumer, a constant temperature condition should be secured. However, in order to maintain a constant temperature condition, it is necessary to adjust the heating and the heat dissipation system appropriately, and also to adjust the external conditions.

Generally, a plurality of pipes are installed in a common vaporizer, and a gasket or a manifold is installed on the upper and lower sides of the vaporizer. The LNG and industrial ultra low temperature liquefied gas are supplied from the lower portion of the vaporizer, The temperature of the internal fluid is raised by the heat exchange between the external temperature and the heat transfer fin and the temperature difference, and the vaporized gas is sent to the use place through the upper manifold or the partitioning chamber.

Such a carburetor is operated for a long time, and when the humidifier in the atmosphere falls below the dew point temperature, the heat transferring effect of the vaporizer is significantly deteriorated because the fin tube, which is a heat exchanger, generates frost. In order to remove the frost and ice attached to the fin tube of the carburetor, the evaporator must be defrosted by periodically applying heat to the fin tube so that the vaporizer can be reused and the function can be maintained.

However, a prior art in which a defrosting means is installed in a vaporizer has not been found, but a technique of disposing a defrost heater close to an evaporator such as a refrigerator has been disclosed, but the constitution is different from the present invention.

Document 1: Japanese Patent Application Laid-Open No. 10-2014-0050026 Document 2: Registration Patent No. 10-1265640

The main object of the present invention is to provide a defrost heater for a cryogenic gas vaporizer capable of defrosting frost and ice adhering to a fin tube by periodically applying heat to a fin tube of a cryogenic gas vaporizer, and a method for heat exchanging the defrost heater.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the precise forms disclosed. Other objects, which will be apparent to those skilled in the art, It will be possible.

According to an aspect of the present invention, there is provided an ultra-low temperature gas vaporizer for purifying an LNG and an industrial gas by periodically applying heat to a fin tube of an ultra-low temperature gas vaporizer, A defrost heater, comprising: an end plate; A support plate installed at a predetermined distance from the end plate; A first housing which seals between the end plate and the support plate and has a refrigerant inlet port through which a refrigerant flows and an outlet through which a refrigerant is discharged; A first baffle dividing the inner space of the first housing into upper and lower portions to block mixing of the refrigerant flowing through the refrigerant inlet port and the refrigerant discharged to the refrigerant outlet port; One end of which is supported by the upper region of the support plate and communicates with the upper space of the first housing, the longitudinal middle portion is bent into a U-shape, and the other end is supported by the lower region of the support plate, A plurality of refrigerant tubes which are refrigerant channels communicating with the lower space; A second housing provided with a heating medium inlet port through which the heating medium as the heat exchange object flows and a heating medium discharge port through which the heating medium is discharged at an upper portion thereof, sealing the periphery of the refrigerant tube while being supported by the support plate; And a second baffle for placing the upper portion of the refrigerant tube in an upper space of the second housing and dividing the inner space of the second housing into upper and lower portions so that the lower portion of the refrigerant tube is located in the lower space, A defrost heater for a vaporizer is provided.

Preferably, the refrigerator includes a plurality of support plates having through holes through which the refrigerant tubes pass to support the plurality of refrigerant tubes at regular intervals, and the support plates may be connected by a connecting bar.

According to another aspect of the present invention, there is provided a method of exchanging heat of a defrost heater for a cryogenic gas vaporizer, wherein the high-temperature refrigerant introduced into the refrigerant inflow port of the first housing flows into an upper space inside the first housing The refrigerant flowing into the upper refrigerant pipe flows along the longitudinal direction of the refrigerant pipe and is diverted downward at a U-shaped bent portion, so that the lower refrigerant pipe And finally discharged through the refrigerant discharge port and the lower space of the first housing which is isolated by the first baffle through the other end of the refrigerant tube,

At the same time, the heat medium introduced into the heat medium inlet port of the second housing flows into the upper space of the second housing, and then is heat-exchanged to the high temperature by the high temperature refrigerant tube in the upper space, The heat medium flowing into the lower space flows through the space between the distal end of the second baffle and the inner surface of the second housing and the heat medium is again heat-exchanged at a high temperature by the refrigerant tube in the lower space, There is provided a heat exchange method for a defrost heater for a cryogenic gas vaporizer which is discharged through a discharge port.

According to the present invention, as the heat is applied to the fin tube periodically, the frost and ice generated on the surface of the fin tube of the vaporizer can be effectively melted and defrosted, thereby improving the performance and efficiency of the vaporizer.

In addition, the present invention effectively increases the heat exchange efficiency by effectively dividing the space into which the refrigerant and the heating medium flow.

1 is a perspective view of a defrost heater for a cryogenic gas vaporizer according to a first embodiment of the present invention;
2 is a perspective view of a defrost heater for a cryogenic gas vaporizer according to a first embodiment of the present invention,
FIG. 3 is a perspective view of a defroster heater for a cryogenic gas vaporizer according to a first embodiment of the present invention, in which both the first and second housings are removed;
4 is a sectional view taken along the line AA in Fig. 1
5 is a perspective view of a defrost heater for a cryogenic gas vaporizer according to a second embodiment of the present invention.
Fig. 6 is a perspective view of the state in which the housing is removed in Fig.
7 is a perspective view of a defrost heater for a cryogenic gas vaporizer according to a third embodiment of the present invention

The present invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments disclosed herein are provided so that the disclosure can be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Like reference numerals designate like elements throughout the specification. It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. &Quot; comprises "and / or" comprising ", as used herein, unless the recited element, step, operation, and / Or additions.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view of a defrost heater for a cryogenic gas vaporizer according to a first embodiment of the present invention, FIG. 2 is a defrost heater for a cryogenic gas vaporizer according to a first embodiment of the present invention, 3 is a perspective view of a defroster heater for a cryogenic gas vaporizer according to a first embodiment of the present invention, in which all of the first and second housings are removed, and Fig. 4 is a sectional view taken along the line AA in Fig.

Referring to the above drawings, the defrost heater 100 for a cryogenic gas vaporizer according to the first embodiment of the present invention includes a defrosting device for periodically supplying a liquid to the fin tube of an ultra low temperature gas vaporizer, (110), a support plate (120), a first housing (130), a first baffle (140), a refrigerant pipe (150), and a second housing 160 and a second baffle 170 and is a shell and tube type heat exchanger using fluid as a heat medium.

The end plate 110 serves to cut off one side of the first housing 130 and includes a first ring frame 111 and a second ring frame 111 bolted to the first ring frame 111, And an end plate (112) for blocking one side of the first and second plates (130, 130). An annular coupling rib 111a is formed on an inner side of the first ring frame 111 so that one end of the first housing 130 is fitted.

The support plate 120 supports the refrigerant pipe 150 while being spaced apart from the end plate 110. The support plate 120 includes a second ring frame 121, And a connection plate 122 formed with a plurality of refrigerant pipe connection holes 122a, which are bolted to the outer surface of the refrigerant pipe 150 and communicate with the refrigerant pipe 150 in the thickness direction. Here, the refrigerant pipe connection hole 122a is divided into upper and lower portions of the connection plate 122 and is distributed.

An annular coupling rib 121a like the first ring frame 111 is formed on the inner side of the second ring frame 121 so that one end of the second housing 160 is fitted .

The first housing 130 seals a space between the end plate 110 and the support plate 120. As described above, one end of the first housing 130 is connected to the end of the first ring frame 111 And is engaged with the engaging rib 111a. The first housing 130 has a refrigerant inlet port 131 through which the refrigerant flows, and a refrigerant discharge port 132 through which the refrigerant is discharged is provided in the upper portion of the first housing 130 .

The first baffle 140 divides the inner space of the first housing 130 into upper and lower portions so that the refrigerant flowing through the refrigerant inlet port 131 and the refrigerant discharged to the refrigerant outlet port 132 It blocks the mixing.

Accordingly, the refrigerant flowing into the refrigerant inlet port 131 is injected into the refrigerant pipe 150 connected to the refrigerant inlet pipe 131 via the refrigerant pipe connecting hole 122a formed on the upper side of the connecting plate 122. [ On the other hand, the refrigerant discharged through the refrigerant discharge port 132 is discharged from the refrigerant tube connection hole 122a formed on the lower side of the connection plate 122.

The refrigerant pipe (150) is a plurality of passage pipes through which high temperature refrigerant flows. One end of each refrigerant pipe 150 is connected to the refrigerant pipe connection hole 122a disposed in an upper region of the connection plate 122 and the other end is connected to a refrigerant pipe And is fitted in communication with the pipe connecting hole 122a. Further, the refrigerant pipe is bent in a U-shape between one end and the other end.

Accordingly, the refrigerant introduced into the first space of the first baffle 140 from the upper space of the refrigerant pipe 150 flows downward through the U-shaped bent portion to be changed in direction, And is discharged into the lower space of the baffle 140.

Here, the plurality of refrigerant pipes 150 are supported by a plurality of support plates 151 at regular intervals. A plurality of through holes 151a are formed in the support plate 151 so that the refrigerant pipe 150 can pass through the support plate 151. The support plates 151 are connected by the connection bars 152, Flow is also prevented.

The second housing 160 is for sealing the periphery of the refrigerant pipe 150. The second housing 160 has one end fitted to a coupling rib 121a provided in the second ring frame 121 of the support plate 120, And a heat medium discharge port 162 through which the heat medium is discharged is provided at a lower portion thereof.

Therefore, the heat medium introduced into the heat medium inlet port 161 is heat-exchanged by the high temperature coolant pipe 150, and then is discharged to the heat medium exhaust port 162.

The second baffle 170 is disposed in the upper space of the second housing 160 so that the upper portion of the refrigerant pipe 150 is positioned and the lower portion of the second baffle 170 is positioned in the lower portion of the second housing 160 160 in the upper and lower directions.

The heating medium introduced into the heating medium inlet port 161 flows into the upper space of the second housing 160 by the second baffle 170 and then flows into the upper space of the second housing 160 through the U- And is discharged through the final heat medium discharge port 162. [ This structure is intended to increase the heat exchange efficiency by allowing the heating medium to come into contact with the refrigerant pipe 150 for a long time.

The defrost heater 100 for a cryogenic gas vaporizer according to the first embodiment of the present invention may further include a pair of supports 180 for supporting the second housing 160 at two points below the second housing 160.

Meanwhile, the surface of the refrigerant pipe 150 of the defrost heater for the ultra-low temperature gas-vaporizer according to the present invention may be made of a metal material such as zinc, steel or stainless steel having high heat resistance. The refrigerant pipe 150 may be dust, A surface protective coating layer may be formed of a surface coating material of a metal material in order to prevent corrosion of the surface from a material or the like. The surface protective coating layer is composed of 2.5% by weight of zirconium powder, 60% by weight of alumina powder, 30% by weight of NH ₄ Cl, 2.5% by weight of zinc, 2.5% by weight of magnesium and 2.5% by weight of titanium.

The zirconium powder is excellent in corrosion resistance and heat resistance. These zirconium powders were mixed at 2.5 wt%. If the mixing ratio of the zirconium powder is less than 2.5% by weight, the corrosion resistance and the heat resistance are not greatly improved. On the other hand, when the mixing ratio of the zirconium powder exceeds 2.5% by weight, the above-mentioned effect is not further improved, but the material cost is greatly increased. Therefore, titanium is preferably mixed at 2.5% by weight.

The alumina powder is added for the purpose of sintering, entangling, fusion prevention, etc. when heated to a high temperature. When such an alumina powder is added in an amount of less than 60% by weight, the effect of sintering, entangling and fusion prevention is deteriorated. When the alumina powder exceeds 60% by weight, the above effect is not further improved, but the material cost is greatly increased. Therefore, it is preferable to add 60 wt% of the alumina powder.

The NH ₄ Cl reacts with zinc and magnesium in a vapor state to activate diffusion and penetration. This NH ₄ Cl is added in an amount of 30% by weight. When NH ₄ Cl is added in an amount of less than 30% by weight, reaction with zinc or magnesium in a vapor state is not properly performed, and thus diffusion and penetration are not activated. On the other hand, if NH ₄ Cl exceeds 30 wt%, the above-mentioned effect is not further improved, but the material cost is greatly increased. Therefore, it is preferable to add 30 wt% of NH ₄ Cl.

The zinc is compounded to prevent corrosion of the metal that is in contact with water and to be used for electrical applications. 2.5% by weight of this zinc is mixed. If the mixing ratio of zinc exceeds 2.5% by weight, corrosion of the metal which is in contact with water can not be properly prevented. On the other hand, when the mixing ratio of zinc exceeds 2.5% by weight, the above-mentioned effect is not further improved, but the material cost is greatly increased. Therefore, it is preferable that zinc is mixed at 2.5% by weight.

Since the pure metal of magnesium has a low structural strength, it is used in combination with the zinc and the like to improve the hardness, tensile strength and corrosion resistance of the metal. This magnesium is mixed at 2.5% by weight. When the mixing ratio of magnesium is less than 2.5% by weight, the hardness, the tensile strength and the corrosion resistance to the salt water of the metal are not greatly improved when they are combined with zinc and the like. On the other hand, when the mixing ratio of magnesium exceeds 2.5% by weight, the above-mentioned effect is not further improved, but the material cost is greatly increased. Therefore, it is preferable that magnesium is mixed with 2.5% by weight.

The titanium is a lightweight, hard and corrosion resistant transition metal element with a silver-white metallic luster. Because it has excellent corrosion resistance and specific gravity, it weighs only 60% of steel. Therefore, the weight of the coating material applied to the metal base material is reduced, Excellent water resistance and corrosion resistance.

This titanium is mixed at 2.5% by weight. If the mixing ratio of titanium is less than 2.5% by weight, the weight of the coating material applied to the metal base material is not so reduced, and glossiness, water resistance and corrosion resistance are not greatly improved. On the other hand, when the mixing ratio of titanium exceeds 2.5% by weight, the above effect is not further improved, but the material cost is greatly increased. Therefore, titanium is preferably mixed at 2.5% by weight.

The surface coating method of the refrigerant pipe 150 according to the present invention is as follows.

The base material on which the surface protective coating layer is to be formed and the coating material combined with the above composition are put into a closed furnace together with argon gas at a rate of 2 L / min in order to prevent oxidation of the base material. Is maintained at a temperature of 700 to 800 for 4 to 5 hours.

The zirconium powder, the alumina powder, the zinc, the magnesium and the titanium compound penetrate into the surface of the base material to form the surface protective coating layer. The zirconium powder, the alumina powder, the zinc, the magnesium and the titanium, .

After the surface protective coating layer is formed, the inside temperature of the closed material is maintained at 30-40 hours by setting the coating material / base composite at 800-900 to form a surface protective coating layer on the surface of the base material, Isolation. At this time, in the above process, the rapid temperature change may cause the temperature change at a rate of 60 / hr because the surface protective coating layer on the surface of the base material may be peeled off.

The surface protective coating layer of the present invention has the following advantages.

Since the surface protective coating layer of the present invention has a very wide range of applications, it can be applied by various methods such as curtain coating, spray painting, dip coating, flooding and the like.

The surface protective coating layer of the present invention can be coated with a very thin layer thickness in addition to the principle protection against corrosion and / or scale, thereby improving electrical conductivity as well as material and cost reduction. A thin electrically conductive primer may be applied to the top of the application layer if high electrical conductivity is desired after the hot forming process.

After the molding process or the hot forming process, the coating material can be retained on the surface of the substrate, for example, to increase scratch resistance, to improve corrosion protection, to meet aesthetic appearance, to prevent discoloration, And may be provided as a primer for conventional downstream processes (e.g., impregnated and electro-mobile dip application).

Since the surface protective coating layer made of zirconium powder, alumina powder, NH ₄ Cl, zinc, magnesium and titanium is applied to the refrigerant pipe 150 of the present invention, corrosion phenomenon on the surface of the refrigerant pipe 150 from dust, Can be prevented.

Alternatively, the refrigerant pipe 150 is made of a metal material, and the surface of the metal material may be coated with a corrosion-resistant coating layer made of a coating composition for improving corrosion resistance and stain resistance.

This coating composition was mixed with a water-soluble resin composition prepared by mixing 70% by weight of resorcinol diglycidyl ether and 25% by weight of propanol amine with 5% by weight of hexamethylated- And adding hexamethylated-hexamethylol melamine.

In the present invention, by using characteristics of resorcinol diglycidyl ether such as excellent chemical resistance, dimensional stability, properties such as corrosion resistance of propanol amine, and excellent lubrication characteristics of melamine derivatives, A coating for preventing corrosion can be formed.

The method of applying such a coating composition for corrosion prevention is preferably applied to the surface of the first and second pipelines 18 and 20 such that the dry film thickness is 10 to 30.

If the dry film thickness is less than 10, the service life can be shortened. If the dry film thickness is more than 30, there is no problem in function, but the economic advantage is reduced.

Also, the refrigerant tube 150 coated with the coating composition for preventing non-woven is air-dried for 10 to 30 minutes and then cured at 100 to 200, preferably 150 to 180 for 10 to 50 minutes to obtain a non- It is possible.

In order to effectively prevent and prevent adhesion of contaminants to the surfaces of the first and second baffles 140 and 170 of the defrost heater 100 for a cryogenic gas vaporizer according to the present invention, A coating layer may be formed. The antifouling coating composition contains hydrogen peroxide and sodium metasilicate in a molar ratio of 1: 0.01 to 1: 2, and the total content of hydrogen peroxide and sodium metasilicate is 1 to 10 wt% with respect to the total aqueous solution. In addition, sodium metasilicate or calcium carbonate may be used as the material for improving the coating property of the anti-fouling coating layer, but sodium metasilicate is preferably used. The hydrogen peroxide and sodium metasilicate are preferably in a molar ratio of 1: 0.01 to 1: 2, and when the molar ratio is out of the above range, the coating property of the substrate is lowered or the moisture adsorption on the surface after coating is increased to remove the coating film have.

The hydrogen peroxide and sodium metasilicate are preferably used in an amount of 1 to 10% by weight based on the total weight of the composition. When the amount of the hydrogen peroxide is less than 1% by weight, the applicability of the base material is deteriorated. Precipitation tends to occur.

As a method of applying the composition for anti-fouling coating on a substrate, it is preferable to apply the coating composition by a spray method. In addition, the thickness of the final coated film on the first and second baffles 140 and 170 is preferably 500 to 2000 angstroms, more preferably 1000 to 2000 angstroms. If the thickness of the coating film is less than 500 angstroms, there is a problem of deterioration in the case of a high-temperature heat treatment. On the other hand, when the thickness of the coating film is more than 2000 angstroms,

The antifouling coating composition may be prepared by adding 0.1 mol of hydrogen peroxide and 0.05 mol of sodium metasilicate to 1000 mL of distilled water and then stirring.

In the present invention, the inner surfaces of the first and second housings 130 and 160 of the defrost heater 100 for a cryogenic gas vaporizer may be formed of brass or bronze coated with ceramics. In this case, it may be constituted by an intermediate layer formed on the inner surface of each housing and made of a metal material, and a coating layer formed on the intermediate layer and made of high hardness ceramic.

The intermediate layer is preferably formed of a metal material composed of any one of Ti, Cr, Zr and Cu, more preferably 0.1 to 1.0 탆 in thickness.

When the first and second housings 130 and 160 are made of brass or bronze, the middle layer of the metal material formed on the surfaces of the first and second housings 130 and 160 is formed as a middle layer so that the coating layer made of high- As the medium, its thickness is formed thin.

More specifically, when the thickness of the intermediate layer is less than 0.1 占 퐉, bonding of the ceramic coating layer is not satisfactorily achieved, and therefore, the intermediate layer must be formed to be 0.1 占 퐉 or more.

In addition, when the thickness of the intermediate layer is not less than 1.0 탆, no particular characteristics are exhibited, so that the thickness is limited to 1.0 탆.

The coating layer is preferably formed of a high hardness ceramic composed of any one of TiN, TiAlN, CrN and ZrN, more preferably 0.5 to 5.0 탆 in thickness.

Such a ceramic coating layer is intended to improve the mechanical properties of the first and second housings 130 and 160 made of brass or bronze and at the same time to improve the corrosion resistance.

Further, when the thickness of the coating layer was 5.0 mu m or more, no particular characteristics were exhibited, so that the thickness was limited to 5.0 mu m.

Here, the intermediate layer of the metal material or the coated layer of the hard ceramic is vacuum deposited using a physical vapor deposition (PVD) process using sputtering or cathodic arc discharge.

With this configuration, when the first and second housings 130 and 160 are made of brass or bronze, the thermal conductivity of the first and second housings 130 and 160 is increased and the temperature of the heating medium rises rapidly, so that more efficient heat exchange can be achieved, Or the characteristics of the surface hardness, wear resistance and corrosion resistance of the bronze first and second housings 130 and 160 can be improved.

On the other hand, a sound-absorbing layer may be applied to the support surface of the support 180 of the underwater combustion liquefied gas vaporization apparatus according to the present invention.

The nonwoven fabric constituting the sound-absorbing layer may be a needle punch nonwoven fabric.

The types of the fibers constituting the sound-absorbing layer made of the needle punch nonwoven fabric include polyester fibers, nylon fibers, polypropylene fibers, acrylic fibers, and natural fibers.

The thickness of the sound-absorbing layer is preferably 0.3 to 15 mm. If the thickness of the sound-absorbing layer is less than 0.3 mm, a sufficient sound-absorbing effect can not be obtained. If the thickness of the sound-absorbing layer is more than 15 mm, the thickness of the flue 500 becomes thick and the combustion gas is not efficiently discharged.

The unit weight of the sound-absorbing layer is preferably 10 to 1000 g / m ² . If it is less than 10 g / m ² , a sufficient sound absorbing effect can not be obtained, and if it exceeds 1000 g / m ² , the light weight of the year 500 can not be ensured.

The fineness of the fibers constituting the sound-absorbing layer is preferably in the range of 0.1 to 30 decitex. If it is less than 0.1 decitex, absorption of low-frequency noise is difficult and cushioning property is lowered, which is not preferable. Further, if it exceeds 30 decitex, it is not preferable to absorb high frequency noise. Among these, the fineness of the fibers constituting the sound-absorbing layer is more preferably in the range of 0.1 to 15 decitex.

The support 180 may be made of a synthetic resin to damp vibration generated in the defrost heater. That is, the support 180 may be a complex decomposable resin composition containing an additive for a synthetic resin. The composite resin composition comprising the additive for a synthetic resin comprises 75 to 85% by weight of the composite degradable resin composition and 15 to 25% by weight of a synthetic resin additive.

Here, the complex decomposable resin composition includes 20 to 80% by weight of a synthetic resin, 1 to 10% by weight of biodegradation, 0.008 to 1.2% by weight of a biodegradation accelerator, 10 to 75% by weight of a decomposition accelerator, 0.001 to 0.5% 0.01 to 3% by weight of an accelerator, 0.01 to 1% by weight of an oxidizing agent, 0.03 to 2% by weight of a dehydrating agent, 0.001 to 1% by weight of a decomposition agent and 1 to 18% by weight of a vinyl hydrophilic agent.

The synthetic resin may be one or more selected from the group consisting of polyethylene, polypropylene, polystyrene, PVAc, EVIE, polyamide, polycarbonate, terephthalic acid polyester, ethylene vinyl acetate copolymer and ethylene acrylic acid Wherein the biodegradation is carried out in the presence of at least one of corn starch, carnauba starch, potato starch, sweet potato starch, wheat starch, wheat starch, corn starch, carnauba starch, potato starch, Or a mixture of two or more thereof. The biodegradation accelerator may be selected from the group consisting of polyhydroxybutyrate, derivatives of polyhydroxybutyrate, polycaprolactone, hydrolactone, hydrobovine, polylactide, alginic acid, pectin, agar, sodium tripolyphosphate, dimethylamine and gelatin And the decomposition accelerator is a mixture of at least one selected from the group consisting of calcium carbonate, talc and folium, and the photosensitizer is selected from the group consisting of cobalt acetylacetonate, 2,4 - metal compounds of pentanedione, metal complexes of 2,4-pentanedione, complexes of dithiocarbamates, complexes of N-tert-butylbenzothiazole-2-sulphonamide, benzophenones, benzophenone derivatives and halogen elements Or a mixture of two or more selected from the group consisting of the compounds. And the above-

Wherein the nourishing agent is at least one selected from the group consisting of lauric acid, oleic acid, citric acid, palmitic acid, behenic acid, succinic acid, malic acid, tartaric acid, maleic acid and fumaric acid And the water-purifying agent is one or a mixture of two or more selected from the group consisting of glycerin, alkylolamide, aldehyde, diethylene glycol, hexylene glycol, propylene glycol, sorbitol and ester, Or a salt thereof selected from the group consisting of salicylic acid derivatives, benzophenone, benzophenone derivatives, benzotriazole, benzotriazole derivatives, triazine, triazine derivatives, organic nickel complexes, hydroxybenzene, ammonia, A mixture of two or more thereof, and the vinyl hydrophilic agent is polyethylene alcohol.

The synthetic resin additive may further contain 70 to 90% by weight of a filler comprising wood powder, calcium carbonate or a mixture thereof, 1 to 3% by weight of a maleic anhydride binder, 1 to 3% by weight of a wax, 0.5 to 1% 1 to 5% by weight of polyethylene, 1 to 3% by weight of a hot-melt adhesive or an ethylene vinyl acetate copolymer, and 5 to 15% by weight of a linear low-density polyethylene.

The calcium carbonate used as the filler has been widely used as an additive for plastics in the past, but it has been difficult to add a large amount of calcium carbonate because it is deteriorated in physical properties of the synthetic resin when it is combined with synthetic resin as a mineral. However, in the present invention, the calcium carbonate is mixed with a maleic anhydride-based binder, polyethylene or polypropylene wax, zinc-based thermal stabilizer, chlorinated polyethylene, hot melt adhesive or ethylene vinyl acetate copolymer (EVA) and linear low density polyethylene (LLDPE) Therefore, even if a large amount of calcium carbonate is used, the physical properties of the synthetic resin are not deteriorated.

Another wood, which is a filler, is a substance that is easily decomposed when buried in the ground, and is a material suitable for producing a decomposable plastic, that is, a decomposable resin composition. Therefore, in order to produce eco-friendly synthetic resin additive, wood powder other than calcium carbonate is used as a filler alone.

Here, the wood powder used is at least 500 mesh. If the wood powder is too large, the production of the product is not easy and the physical properties of the product may be deteriorated.

Both the wood powder used as the filler and calcium carbonate are not only inexpensive but also light in weight, so that they can produce a bulky synthetic resin product in comparison with other fillers even if they use the same weight. For example, when mulching vinyl is produced as a raw material of the same weight, a greater amount of mulching vinyl can be produced. In other words, the production of synthetic resin products can be maximized. The filler is used in an amount of 70 to 90% by weight.

And, the maleic anhydride-based binder is used to bind each raw material in the additive to each other, and is included in the range of 1 to 3% by weight. If the amount of the maleic anhydride-based binder is less than 1% by weight, the binder will not act as a binder, and if it exceeds 3% by weight, excess amount will result in lowering the physical properties of the synthetic resin product.

The wax is determined depending on the raw material of the synthetic resin. When the synthetic resin is polypropylene (PP), the wax is also PP wax. When the synthetic resin is polyethylene (PE), the wax is also PE wax. The wax is used to reduce the burden on the equipment during the extrusion molding, and is contained within the range of 1 to 3% by weight. If the amount of the wax is less than 1% by weight, the extruder is subjected to a large burden in the extrusion molding. If the wax is more than 3% by weight, the activity of the extruder is increased.

The zinc-based thermal stabilizer serves as a dispersing agent for ensuring the dimensional stability and uniformity of the produced synthetic resin product. In the present invention, the kind of the zinc-based thermal stabilizer is not limited. For example, Zinc Laurate may be used. When the zinc thermal stabilizer is used in an amount of less than 0.5% by weight, the effect is insignificant. When the zinc thermal stabilizer is used in an amount exceeding 1% by weight, This is because synthetic resin products can easily break down.

The chlorinated polyethylene (CPE) is a thermoplastic elastomer having the characteristics of plastic and rubber. It is used as an impact modifier and helps to prevent deterioration of the physical properties of a synthetic resin even when additives are added. In this case, the CPE is used within a range of 1 to 5% by weight. If the amount is less than 1% by weight, the effect becomes insignificant. If the amount is more than 5% by weight, .

The hot melt adhesive or the ethylene vinyl acetate copolymer (EVA) can lower the extrusion temperature of the additive product, and the lower the processing temperature (extrusion temperature) of the additive, the more the processing amount per unit time becomes. Can get the effect. In addition, by lowering the extrusion temperature to reduce the product defect rate, the production cost can be further reduced.

The hot melt adhesive or the EVA can lower the extrusion temperature by 20 ° C or more than the conventional extrusion temperature (180 to 210 ° C) because the hot melt adhesive or EVA has a lower molecular weight than the mineral and polymer used, The hot melt adhesive or EVA, which is a raw material with a low molecular weight, is poured onto the surface of the product, and even if the extrusion temperature is lowered due to the hot melt adhesive or EVA having excellent adhesiveness, the bonding strength becomes excellent when the raw materials are combined.

The hot melt adhesive or EVA is used within a range of 1 to 3% by weight. If the amount is less than 1% by weight, it is difficult to lower the extrusion temperature. If the amount is more than 3% by weight, It is preferable to use it within the range. The type of the hot-melt adhesive is not limited, and any type of hot-melt adhesive sold in the market can be used. For example, a urea resin adhesive or the like can be used as the hot melt adhesive.

The above-mentioned linear low density polyethylene (LLDPE) is a subject to be used as an adhesive when mixed with polypropylene or polyethylene which is a raw material of a synthetic resin product, and its usage amount is preferably 5 to 15% by weight. If the amount is less than 5% by weight, mixing with polypropylene or polyethylene may be difficult, resulting in poor physical properties of a synthetic resin product. If the amount is more than 15% by weight, physical properties are improved but the cost is high. Because.

As described above, the additive for synthetic resin comprising filler, maleic anhydride-based binder, polyethylene or polypropylene wax, zinc based thermal stabilizer, chlorinated polyethylene, hot melt adhesive or ethylene vinyl acetate copolymer (EVA) and linear low density polyethylene (LLDPE) Stearic acid, paraffin wax, and poly wax. The stearic acid, paraffin wax, and poly wax are not added to the extruder. The total amount of stearic acid, paraffin wax, poly wax and the like to be further mixed is preferably in the range of 0.5 to 1.5% by weight, considering the physical properties of the product.

[0040] The filler, the maleic anhydride binder, the polyethylene or the polypropylene wax, the zinc-based thermal stabilizer, the chlorinated polyethylene, the hot melt adhesive or the ethylene vinyl acetate copolymer (EVA), the linear low density Polyethylene (LLDPE), stearic acid, paraffin wax, poly wax, etc. are all used in powder or granular form.

Since the synthetic resin additive of the present invention having the above-described constitution is 1/2 the price of polypropylene or polyethylene, which is a synthetic resin, and the weight per unit volume of the raw material is only 2/3, And can produce synthetic resin products with high price competitiveness.

In addition, since 15 to 25% by weight of the additive for a synthetic resin is mixed with 75 to 85% by weight of the complex-decomposable resin composition, the manufacturing cost of the complex-decomposable resin composition can be greatly reduced. The reason why the mixing ratio of the synthetic resin additive is 15 to 25% by weight is that if the additive is less than 15% by weight, the manufacturing cost can not be significantly lowered. If the additive is more than 25% by weight, However, if wood flour capable of spontaneously decomposing as a filler is used, the additive for synthetic resin is mixed with the complex-decomposable resin composition at a weight ratio of 1: 1 It is possible to use.

Hereinafter, the operation of the defrost heater 100 according to the first embodiment will be briefly described.

The high temperature refrigerant introduced into the refrigerant inlet port 131 of the first housing 130 flows into the upper space inside the first housing 130 and then flows into the refrigerant pipe 150 ).

The refrigerant flowing into the refrigerant pipe 150 on the upper side flows along the longitudinal direction of the refrigerant pipe and is diverted downward in the U-folded portion to flow in the opposite direction through the lower refrigerant pipe 150, And finally discharged through the refrigerant discharge port 132 and the lower space of the first housing 130 which is isolated by the first baffle 140 through the other end of the refrigerant pipe 150.

In addition, the heating medium flowing into the heating medium inlet port 161 of the second housing 160 flows into the upper space of the second housing 160, and then the high-temperature refrigerant pipe 150 in the upper space The refrigerant flows into the lower space of the second housing 160 through the U-shaped bent portion of the refrigerant pipe 150 between the distal end of the second baffle 170 and the inner surface of the second housing 160, The heat medium flowing into the second housing 160 is heat-exchanged again at a high temperature by the refrigerant pipe 150 in the lower space, and then discharged through the heat medium discharge port 162 of the second housing 160.

The discharged high-temperature heat medium is supplied to the fin tube of the ultra-low temperature gas vaporizer, and the frost or ice adhering to the surface of the fin tube is sprayed.

FIG. 5 is a perspective view of a defrost heater for a cryogenic gas vaporizer according to a second embodiment of the present invention, and FIG. 6 is a perspective view of the state in which the housing is removed in FIG.

Referring to the above drawings, the defrost heater 200 for a cryogenic gas vaporizer according to the second embodiment of the present invention differs from the defrost heater 200 according to the present invention in that heat exchange is performed by an electric heater, unlike heat exchange using the refrigerant in the first embodiment.

A plurality of heating wires 220 supported by the supporting plate 210 and a heating medium inlet port 231 supported by the supporting plate 210 and having a heating medium inlet at one side thereof, And a cover 230 provided with a heating medium discharge port 232 through which the heating medium is discharged. The shell 230 is a shell and tube type electric heater type heat exchanger using electricity as a heating medium.

According to this configuration, the heating medium flowing into the heating medium inlet port 231 is heat-exchanged at a high temperature by the heating wire 220 inside the cover 230, and then discharged to the heating medium discharging port 232.

In addition, the material applied to the inner surface of the cover 230 and the base material follow the first and second housings 130 and 160, and the support 240 supporting the cover 230 at two points, The layer applied and the support material also follow the description of the first embodiment.

On the other hand, in addition to the defrost heaters of the first and second embodiments described above, the plate-like defrost heater 300 of the third embodiment can be applied as shown in Fig. The plate type defrost heater 300 alternately flows a heating medium (solid line) and a refrigerant (dotted line) alternately between the plate 310 and the plate 310 like a general plate type heat exchanger, Heat exchange with the heat exchanger. It is a plate heat exchanger that uses fluid as a heat source.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the same is by way of illustration and example only and is not to be construed as limiting the present invention. It is obvious that the modification or improvement is possible.

Further, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

100: Defrost heater for ultra-low temperature gas vaporizer of the first embodiment
110: end plate 111: first ring frame
111a: engaging rib 112: ending plate
120: support plate 121: second ring frame
122: connecting plate 122a: refrigerant pipe connecting hole
130: first housing 131: refrigerant inlet port
132: Refrigerant discharge port 140: 1st baffle
150: refrigerant tube 151: support plate
151a: through hole 152: connecting bar
160: second housing 161: heating medium inlet port
162: Heating medium exhaust port 170: Second baffle
180: Support
200: Defrost heater for cryogenic gas vaporizer of the second embodiment
300: Defrost heater for cryogenic gas vaporizer of the third embodiment

Claims (3)

A defrost heater (100) for a cryogenic gas vaporizer for periodically applying heat to a fin tube of an ultra-low temperature gas vaporizer which is supplied with a cryogenic gas in the liquid state of LNG and industrial gas in a vaporized state,
The defrost heater (100)
An end plate 110;
A second ring frame 121 and a second ring frame 121. The first ring frame 121 and the second ring frame 121 are spaced apart from the end plate 110 by a predetermined distance and support the coolant pipe 150. The second ring frame 121 and the second ring frame 121 are bolt- And a connection plate 122 having a plurality of refrigerant pipe connection holes 122a communicating with the refrigerant pipe 150. The refrigerant pipe connection holes 122a are divided and distributed to the upper side and the lower side of the connection plate 122 A support plate 120 having an annular coupling rib 121a formed on the inner side of the second ring frame 121 and having one end of the second housing 160 fitted thereto;
A refrigerant inlet port 131 through which the refrigerant flows into the upper portion is sealed and a space between the end plate 110 and the support plate 120 is provided with a refrigerant outlet port 132 through which the refrigerant is discharged, (130);
A first baffle (not shown) for isolating the inner space of the first housing 130 from the upper and lower portions to block the mixing of the refrigerant introduced through the refrigerant inlet port 131 and the refrigerant discharged to the refrigerant outlet port 132 140);
One end of which is supported by the upper region of the support plate 120 and communicates with the upper space of the first housing 130, the middle portion in the longitudinal direction is bent in a U shape and the other end is supported by the lower portion of the support plate 120 A plurality of refrigerant pipes (150) supported by the first housing (130) and communicating with a lower space of the first housing (130);
A heating medium inlet port 161 through which the heating medium serving as a heat exchange object flows is provided at an upper portion of the refrigerant pipe 150 while being supported by the support plate 120 and a heating medium discharge port A second housing 160 provided with a second housing 162; And
The upper portion of the refrigerant pipe 150 is positioned in the upper space of the second housing 160 and the lower portion of the refrigerant pipe 150 is positioned in the lower space, A second baffle (170) dividing the first baffle (170);
And a plurality of support plates 151 each having a through hole 151a through which the refrigerant pipe 150 passes to support the plurality of refrigerant pipes 150 at predetermined intervals, Lt; / RTI >
A surface protective coating layer is formed on the surface of the refrigerant pipe 150. The surface protective coating layer is composed of 2.5 wt% of zirconium powder, 60 wt% of alumina powder, 30 wt% of NH ₄ Cl, 2.5 wt% of zinc, 2.5% by weight of magnesium, and 2.5% by weight of titanium;
The antifouling coating composition may include hydrogen peroxide and sodium metasilicate in a molar ratio of 1: 0.01 to 1: 2. The antifouling coating composition may be applied on the surfaces of the first and second baffles 140 and 170, ;
An intermediate layer made of a metal material is applied to the inner surfaces of the first and second housings 130 and 160 of the defrost heater 100 for a cryogenic gas vaporizer and a coating layer made of a high hardness ceramic is coated on the intermediate layer. , Zr, and Cu, and the intermediate layer has a thickness of 0.1 to 1.0 占 퐉;
The thickness of the sound-absorbing layer is 0.3 to 15 mm, the unit weight of the sound-absorbing layer is 10 to 1000 g / m ² , and the thickness of the fibers of the sound- The fineness is 0.1 to 30 decitex;
Wherein the support 180 comprises a complex decomposable resin composition comprising an additive for a synthetic resin, wherein the composite resin composition comprising the additive for a synthetic resin contains 75 to 85% by weight of the complex decomposable resin composition and 15 to 25% Wherein the composite degradable resin composition comprises 20 to 80% by weight of a synthetic resin, 1 to 10% by weight of biodegradation, 0.008 to 1.2% by weight of a biodegradation accelerator, 10 to 75% by weight of a degradation accelerator, 0.001 to 0.5% 0.01 to 3% by weight of a photosensitizer, 0.01 to 1% by weight of an oxidizing agent, 0.03 to 2% by weight of a water-purifying agent, 0.001 to 1% by weight of a decomposition agent, and 1 to 18% by weight of a vinyl hydrophilic agent Defrost heater for cryogenic gas vaporizer.
delete In the heat exchange method for a defrost heater for an ultra-low temperature gas vaporizer according to claim 1,
The high temperature refrigerant flowing into the refrigerant inlet port 131 of the first housing 130 flows into the upper space inside the first housing 130 and then flows into the refrigerant pipe connected to the upper side of the support plate 120 The refrigerant flowing into the upper refrigerant pipe 150 flows along the longitudinal direction of the refrigerant pipe 150 and is diverted downward at the U-folded portion to be separated from the lower refrigerant pipe 150, The refrigerant is discharged through the lower space of the first housing 130 and the refrigerant discharge port 132 isolated by the first baffle 140 through the other end of the refrigerant pipe 150, And,
At the same time, the heating medium flowing into the heating medium inlet port 161 of the second housing 160 flows into the upper space of the second housing 160, and then the high-temperature refrigerant pipe 150 in the upper space 160 The refrigerant flows into the lower space of the second housing 160 through the U-shaped bent portion of the refrigerant pipe 150 between the distal end of the second baffle 170 and the inner surface of the second housing 160, Wherein the heat medium flowing into the second housing (160) is heat-exchanged again at a high temperature by the refrigerant pipe (150) in the lower space, and then discharged through the heat medium discharge port (162) of the second housing (160).

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