JPH02132204A - Storage container of asphalt mixture - Google Patents

Abstract

PURPOSE:To make it possible to supply a large amount of inert gas at suitable temperature in a short period of time by providing a burner forming a flame in a combustion cylindrical body soaked in a sealed water tank and connecting an exhaust pipe provided on the upper part of the water tank to a storage container of asphalt mixture. CONSTITUTION:A sealed water tank 21 is provided on the side of a storage container 1 of asphalt mixture and a flame is formed with a burner 25 inside a combustion cylindrical body 23 soaked in the water tank 21, so that an inert gas is sent into the water. Then, this inert gas is led to the storage container 1 to store asphalt mixture through an exhaust pipe 31 provided in the upper part of the water tank 21. Furthermore, air inside the container 1 is replaced with the inert gas. Consequently, it is possible to supply the inert gas at suitable temperature cheaply.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an asphalt mixture storage container for storing an asphalt mixture used as a road paving material for a long period of time.

[Prior art] Asphalt mixtures used as road paving materials are
It is generally known that oxidative deterioration occurs when exposed to air containing oxygen. Therefore, in asphalt mixture storage containers in which asphalt mixtures are stored for long periods of time, the air in the empty space inside the storage containers must be replaced by water vapor or inert gas (N2).
, CO2 gas), etc., to prevent the asphalt mixture from coming into contact with oxygen as much as possible.

[Problems to be Solved by the Invention] However, the temperature of the steam and inert gas supplied to the storage container is lower than the temperature of the asphalt mixture stored at around 160°C, and it is difficult to supply a large amount of gas in a short period of time. The disadvantage is that it cannot be replaced.

Therefore, in view of the above points, the present invention aims to provide an asphalt mixture storage container equipped with a device capable of supplying a large amount of inert gas at approximately the same temperature as the asphalt mixture stored in the storage container in a short period of time. That is.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a sealed water tank on the side of a storage container for storing an asphalt mixture, and penetrates the upper lid of the water tank to immerse the combustion cylinder into water. This invention provides an asphalt mixture storage container characterized by being provided with a burner that forms a flame within the combustion cylinder toward the water surface by being immersed in the water tank, and an exhaust pipe provided at the top of the water tank is connected to the storage container. ．． [Function] In the present invention, a flame is formed in the combustion cylinder immersed in a water tank, and combustion gas is sent into the water while the burner is completely combusted with a small amount of excess air. The combustion gas sent into the water exchanges heat with the water while rising through the water, and the gas temperature drops to an appropriate temperature. This combustion gas is completely combusted with a small amount of excess air, so it contains little oxygen and is an inert gas, and the temperature of the combustion gas can also be controlled to be close to that of the asphalt mixture stored in the storage container. It is. This inert combustion gas is then led to the storage container where the asphalt mixture is stored through an exhaust pipe installed above the water tank. Since this inert gas is generated by combustion in the burner, it can be generated in large quantities in a short period of time, and the air in the storage container can be replaced with inert combustion gas in a short period of time.

[Example] Embodiments of the present invention will be described below based on the drawings.

1 is a storage container for storing an asphalt mixture, and the peripheral wall of the storage container 1 is provided with a heating and heat-insulating structure to prevent the stored asphalt mixture from hardening due to a drop in temperature. A pair of butterfly-shaped gates 2 and 2' are swingably attached to the shaft bodies 3 and 3' at the material discharge port at the lower end of the storage container 1, and the material discharge port is opened and closed by the expansion and contraction of the bistro rod 5 of the fluid cylinder 4. Opening and closing are performed. Although the butterfly gates 2, 2' are effective in controlling the release, it is difficult to form an airtight seal at the material outlet;
The figure shows an example in which a double gate is used to maintain airtightness, in which the material discharge port is surrounded by a cover 6 and
A shutoff gate 9 is provided at the lower end opening of the fluid cylinder 7 and moves forward and backward by the expansion and contraction of the piston rod 8 of the fluid cylinder 7 to improve the degree of sealing.

10 is an input port for asphalt mixture, and input gate 1 is opened and closed by expansion and contraction of piston rod 12 of fluid cylinder 1L.
Open and close 3. 14 is a small-diameter exhaust port provided at the top of the storage container 1, and is used to gradually exhaust the gas accumulated in the cavity 15 inside the storage container 1 to the outside. Reference numeral 16 denotes a suction port for sucking atmospheric air in order to cancel the partial vacuum generated in the storage container 1 when the asphalt mixture is discharged from the material discharge port. 19 is opened to suck in the atmosphere.

Reference numeral 20 denotes an inert gas generator provided on the side of the storage container 1, which generates inert combustion gas and supplies it into the storage container 1. 2L is a sealed water tank storing water for lowering the gas temperature to an appropriate temperature by exchanging heat with inert combustion gas, and a combustion cylinder 23 is provided passing through the upper lid 22 of the water tank 21. The combustion cylinder 23 is immersed in water stored in the water tank 2L, and its tip reaches near the bottom of the water tank 2L. Further, an appropriate number of through holes 24 for blowing out combustion gas are provided in the portion of the combustion cylinder 23 that is immersed in water.

A burner 25 is attached to the upper end of the combustion cylinder 23 to form a flame within the combustion cylinder 23. 2
A fuel tank 6 stores propane gas (heavy oil may be used), and the fuel tank 26 is connected to the burner 25 via a supply pipe 27. Further, a flow rate control valve 28 is provided in the middle of the supply pipe 27, and this flow rate control valve 28
The combustion amount of burner 25 is adjusted by. Reference numeral 29 denotes a blower for feeding combustion air under pressure, and is connected to the burner 25 via a blow pipe 30. The amount of air sent under pressure by this blower 29 is controlled proportionally to the combustion amount of the burner 25,
The burner is controlled to ensure complete combustion by constantly maintaining a constant air ratio. 3l is an exhaust pipe that connects the upper part of the water tank 2l and the storage container 1, and exhausts the combustion gas filled in the water tank 2l to the storage container 1.
It leads to. Although the figure shows the exhaust pipe 3l connected to the upper part of the storage container l, the exhaust pipe 3l may be branched and one side of the exhaust pipe 3l may be connected to the cover unit 6 at the lower part of the storage container 1.

Reference numeral 32 denotes a replenishment water tank for replenishing water to the water tank 2L, and is connected to the lower part of the water tank 2L via a communication pipe 33. A level meter 34 is inserted into the replenishment water tank 32 from above, and the detected value of the level meter 34 controls the water injection valve 36 attached to the water injection pipe 35 to maintain the water level of the replenishment wooden tank 32 and the water tank 21 at a predetermined height. I try to keep it that way. Therefore, when replacing the inside of the storage container l with an inert gas, first, the water level in the water tank 21 is adjusted to the set liquid level by operating the level meter 34 and water injection valve 36 provided in the makeup water tank 32. put. Then, the blower 29 is driven to send high pressure air to the burner 25 and the fuel tank 2
6, the fuel is sent to the burner 25 and combusted while adjusting the flow rate with the flow control valve 27. At this time, it is preferable to achieve complete combustion, and the air ratio should be controlled to be appropriate.
The flame of the burner 25 pushes down the water level inside the cylindrical body 23 immersed in water and is formed inside the cylindrical body 23, and the combustion gas that is completely combusted within the cylindrical body 23 is released from the lower end opening and the tip of the cylindrical body 23. It is ejected into the water from a through hole 24 drilled nearby. As the combustion gas rises through the water, it exchanges heat with the water, thereby lowering the gas temperature to a temperature suitable for introduction into the storage vessel I.

The combustion gas that has risen through the water and reached the top of the water tank 21 is sent into the storage container l through the exhaust pipe 3l provided at the top of the water tank 21, expels the air inside the storage container 1 from the exhaust port 14, and burns the inside of the storage container 1. It is filled with gas. The temperature of the combustion gas fed into the storage container 1 is preferably approximately the same as the temperature of the asphalt mixture stored in the storage container 1, but the combustion gas temperature is controlled by the combustion amount of the burner 25. Alternatively, the water level in the water tank 2L may be controlled by controlling the water injection valve 36. Further, in the embodiment, the replenishment water tank 32 is provided separately from the water tank 21, but the level meter 34 and the water injection pipe 35 may be inserted directly into the water tank 2l without providing the replenishment water tank 32.

[Effects of the Invention] As described above, in the asphalt mixture storage container according to the present invention, the burner 25 is used for complete combustion at an appropriate air ratio to generate combustion gas that has a low oxygen concentration and is inert to the asphalt mixture. to eject this combustion gas into the water,
The gas temperature is lowered to an appropriate temperature close to that of the asphalt mixture in the storage container 1 through heat exchange with water, and then the gas is sent into the storage container 1 to be exchanged with the air in the storage container 1. It does not lower the internal atmospheric temperature and does not adversely affect the quality of the asphalt mixture.

Furthermore, since this inert gas is produced by combustion in the burner, it can be generated in large quantities in a short period of time, and the air in the storage container 1 can be replaced with the inert combustion gas in a short period of time.

Furthermore, this inert combustion gas can be provided at a lower cost than conventional steam, inert gas (N2.Cox gas), etc., and is therefore economically advantageous.

[Brief explanation of the drawing]

FIG. 1 is a partially vertical front view of an asphalt mixture storage container according to the present invention. 1...Storage container 20...Inert gas generator 2
l...Water tank 23...Combustion cylinder 24...Through hole
25... Burner 26... Fuel tank 29...
Blower 31...Exhaust pipe 32...Replenishment water tank 34
... Level meter 35 ... Water injection pipe 36 ... Water injection valve

Claims (1)

[Claims] A sealed water tank is provided on the side of the storage container for storing the asphalt mixture, and a combustion cylinder is immersed in water through the top cover of the tank, and a burner is provided to form a flame inside the combustion cylinder toward the water surface. An asphalt mixture storage container, characterized in that an exhaust pipe provided at the top of the water tank is connected to the storage container.