KR101289362B1 - Vaporizer for gas fuel engine - Google Patents

Abstract

According to the vaporization apparatus of the present invention, the partition wall dividing the engine coolant side and the gas fuel side can be effectively avoided without accompanying deterioration in durability due to corrosion of the engine coolant and deterioration of heat exchange efficiency.

Most of the main body is made of aluminum, and the hot water chamber 22 for introducing engine cooling water and the vaporization chamber 42 for introducing and vaporizing liquid gas fuel are partitioned into partitions. In the vaporization apparatus 1A of a gas fuel engine which promotes vaporization of gaseous fuel, at least the hot water chamber side surface of the partition plate 3 forming the partition wall is protected against corrosion by engine cooling water rather than the aluminum material forming the body. It is formed of a material with high corrosion resistance.

Hot water chamber, vaporization chamber, main body, bulkhead, gas fuel engine, vaporizer, hot water chamber side surface, plate member, coating.

Description

Vaporizer for Gas Fuel Engines {VAPORIZER FOR GAS FUEL ENGINE}

1 is an exploded perspective view of a vaporization apparatus according to an embodiment of the present invention.

2 is a layout view showing a fuel supply system of a conventional gas fuel engine.

Explanation of symbols on the main parts of the drawings

1A: vaporizer 2: hot water unit

3: partition plate 4: LPG section

5: cover 22: hot water chamber

42: vaporization chamber 43: pressure reduction mechanism

Japanese Patent Application No. 10-142219

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vaporization apparatus for introducing a gas fuel filled in a pressure vessel, depressurizing and vaporizing it at a predetermined pressure, and sending the gas fuel to a gas fuel engine. It relates to a gas fuel engine vaporizer which is used to promote the vaporization of liquid gas fuels such as gas (LPG).

Conventionally, when supplying a gaseous fuel such as liquefied petroleum gas (LPG) to a gaseous fuel engine, as shown in FIG. 2, a high-pressure gaseous fuel filled in the pressure vessel 50 is introduced into a vaporization device (regulator) 1B. Heat exchange is carried out in the vaporization chamber 31 adjacent to the coolant chamber 32 into which the engine coolant is introduced, and vaporized. Then, the pressure control chamber 30 adjusts the pressure to a predetermined pressure to reduce the pressure. It is generally sent to 44 and supplied to the gas fuel engine 40.

As described above, two types of fluid, engine coolant and gaseous fuel, are introduced into the vaporizer 1B to perform heat exchange. The vaporizer 1B main body is made of an aluminum material having almost excellent thermal conductivity in consideration of heat exchange efficiency. . By the way, many of the cooling water contains an acidic substance or a substance which promotes corrosion, and the aluminum material corrodes with prolonged use, and the partition 33 partitioning the engine coolant side and the gas fuel side becomes thin and penetrates. The problem of discarding may occur, which is one of the causes of impairing the durability of the vaporizer.

As described in Japanese Patent Application Laid-Open No. 10-142219 for the problem of corrosion by such cooling water, a portion of the cooling water is automatically sampled to measure the degree of corrosion, and accordingly, the corrosion preventing agent is automatically appropriately determined. It is known to manage the state of cooling water by injecting the liquid into the liquid. However, this method can be considered to be applied to a large-scale facility such as a chemical plant, and it is not practical to apply to a fuel supply system of a gas fuel engine that requires compactness and low cost.

Therefore, in the case of the gas fuel engine vaporizer, the thickness of the partition which divides the engine coolant side and the gas fuel side in advance is sufficiently thick in consideration of such a reduction in thickness caused by corrosion. However, by making the partition wall thick in this way, there arises a problem that the heat exchange efficiency is deteriorated.

The present invention aims to solve the above problems, and an object thereof is to reduce durability and deterioration of heat exchange efficiency due to corrosion of the partition wall separating the engine coolant side and the gas fuel side in the vaporization apparatus. To avoid it effectively.

The vaporization apparatus of the present invention is formed of an aluminum material, and has a body in which a hot water chamber for introducing engine cooling water and a vaporization chamber for introducing and vaporizing liquid gas fuel are partitioned into partitions, and focusing on heat exchange through the partitions. A gas fuel engine vaporization apparatus for promoting vaporization of gas fuel, wherein at least the hot water chamber side surface of the partition wall is formed of a material having higher corrosion resistance to corrosion by engine cooling water than an aluminum material forming the main body. It is done.

Therefore, it is possible to increase the corrosion resistance to corrosion of the engine cooling water without thickening the partition wall of the vaporization apparatus, without impairing the heat exchange efficiency.

In the vaporization apparatus, the partition wall is formed of a plate-shaped member separate from the components forming the hot water chamber and the vaporization chamber, and the components forming the hot water chamber separated from each other and forming the vaporization chamber. If sandwiched between the parts to form sandwiched parts, the bulkhead can be easily processed and manufactured, corrosion resistance can be easily provided, and the hot water chamber and the vaporization chamber can be secured simply by sandwiching the components on the hot water chamber side and the components on the vaporization chamber side. Since it can be partitioned so that manufacture of a main body becomes easy.

Moreover, in the vaporization apparatus which consists of a plate-shaped member, when a partition member consists of stainless steel, it is extremely excellent in corrosion resistance and can be made thinner, or it is corrosion-resistant to the surface which becomes at least the hot water chamber side of a predetermined metal plate. Even if a predetermined coating for increasing the resistance is performed, excellent corrosion resistance can be obtained. In this case, when the coating is made of plating or resin coating, corrosion resistance is easily and reliably provided.

(Best Mode for Carrying Out the Invention)

Best Mode for Carrying Out the Invention The best embodiment for carrying out the present invention will be described below with reference to the drawings. In this embodiment, the case where the fuel used is LPG is demonstrated.

Referring to an exploded perspective view of the vaporization device 1A of FIG. 1, the vaporization device 1A is a generally cylindrical device in which a main body is divided into functional parts, and a hot water chamber 22 introducing and storing engine coolant at the bottom thereof. Pressure-reducing mechanism (43) having a hot water section (2) forming a wall), a partition plate (3) forming a partition thereon, a vaporization chamber (42) for introducing LPG from the pressure vessel thereon, and a pressure-reducing chamber by a valve. Is composed of an integrated LPG portion 4, and a cover portion 5 of a disk shape having a pressure control spring built in the uppermost portion.

These four parts 2, 3, 4, and 5 are fixed in the vertical direction by eight through bolts 6 penetrating at the same pitch, and the hot water part 2, the partition plate 3, and the partition plate 3 are fixed. O-rings 7 and 7 are provided on the outer peripheral side of the contact surface of the LPG unit 4 and the LPG unit 4, respectively, to prevent the engine coolant and the LPG from flowing out.

Although the main body of the hot water part 2, the LPG part 4, and the cover part 5 is formed by aluminum die casting similarly to the conventional example, the partition plate 3 which becomes a partition is superior in corrosion resistance than this aluminum material. It is formed of a material (stainless steel), and is easily formed by simply cutting the material of the thin plate, and is extremely thin in comparison with the partition wall of the conventional example, and the hot water part 2 and the LPG part 4 made of different parts. The fact that a partition can be formed by sandwiching is a characteristic part of this embodiment.

Therefore, a partition having excellent resistance against acidic substances or corrosion-promoting substances contained in the engine cooling water and having excellent corrosion resistance can be installed by a relatively easy procedure to complete the main body, and the partition is made of a very tough material. In this way, the bulkhead can be made significantly thinner as compared with the conventional example, and the vaporization apparatus with extremely excellent heat exchange efficiency is realized.

Next, the operation of the present embodiment will be described. Engine cooling water sent from the engine side flows in from the inlet pipe 8 of the hot water part 2. The hot water chamber 22 in the hot water unit 2 has a flow path in a maze shape, and the engine coolant passes through a long flow path, thereby improving heat exchange efficiency. The engine coolant flows out of the outlet pipe 9 on the opposite side of the inlet pipe 8 and returns to the engine side.

While the hot water chamber 22 and the partition plate 3 are sandwiched, a vaporization chamber 42 of the LPG unit 4 is formed upward, and the high pressure LPG sent from the pressure vessel to the vaporization chamber 42 is in a liquid state. Inflow. Similar to the hot water chamber 22, the vaporization chamber 42 also has a labyrinth, and the heat exchange efficiency is improved. The LPG in the vaporization chamber 42 is heated by conducting heat of the engine cooling water through the partition plate 3 to promote vaporization.

In the heat exchange between the engine coolant and the LPG through the partition plate 3, the partition wall is made of SUS material which is more resistant to corrosion by the engine coolant than the aluminum material forming the main body. As a result, the time required for heat conduction is drastically shortened, indicating extremely high heat exchange efficiency.

LPG, which is a gas in the vaporization chamber 42, is decompressed to about 30 kPa by a pressure reducing mechanism 43 incorporating a pressure regulating chamber by a valve, and then is sent to the injector through the fuel outlet 41 and supplied to the gas fuel engine. do.

The partition plate 3 is formed by forming a metal material having a relatively high thermal conductivity such as a copper material, a copper alloy, aluminum or an aluminum alloy in a thin sheet state instead of being formed of the above-described SUS material, and at least the hot water chamber 22 The present invention can also be carried out by coating the surface serving as the side so that the corrosion resistance is higher than that of the aluminum material, and the same effect can be obtained. In that case, as a coating method, coating by general plating, resin coating, such as Teflon coating, can be selected.

As described above, according to the present invention, the degradation of durability due to corrosion of the partition wall due to the engine cooling water can be effectively avoided without deterioration of the heat exchange efficiency.

According to the gas-fuel engine vaporizing apparatus of the present invention, at least the hot water chamber side of the partitions has a higher corrosion resistance than the main material, so that the partitions are not thickened and the deterioration of the heat exchange efficiency is not accompanied by corrosion of the partition walls due to the engine coolant. The fall of durability of the vaporization apparatus by this can be effectively avoided.

Claims (5)

An aluminum material is formed of an aluminum material and includes a body in which a hot water chamber for introducing engine cooling water and a vaporization chamber for introducing and gasifying liquid gas fuel are partitioned into partitions, and at least a hot water chamber side surface of the partitions forms the main body. In the vaporization device of a gas fuel engine formed of a material having a higher corrosion resistance to corrosion by the engine coolant, A gas fuel engine vaporization apparatus that promotes vaporization of gaseous fuel centered on heat exchange through the partition wall, wherein the partition wall is formed of a plate-shaped member separate from the parts forming the hot water chamber and the vaporization chamber, and separately from each other. Sandwiched between a part forming the hot water chamber and a part forming the vaporization chamber are sandwiched, Vaporizers for gas fuel engines. The method of claim 1, A gas fuel engine vaporization apparatus, wherein the plate member is formed of stainless steel. The method of claim 1, The vaporization apparatus of the gaseous fuel engine which gave predetermined | prescribed coating for improving corrosion resistance on the surface used as the hot water chamber side in the said plate-shaped member. The method of claim 3, Wherein said coating is a plating or resin coating. delete

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