JPS625812B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention provides powders such as raw materials for iron making and refractory materials,
This invention relates to a vehicle that dries granular and lumpy materials.

Refractory materials such as magnesia clinker used as raw material for high-temperature industrial kilns or magnesia refractories, ferroalloys such as ferromanganese, ferrosilicone, and ferrochrome, or common steelmaking raw materials such as coke and coal. Most refractory materials are handled as powder, granules, lumps, or a mixture of these, and most of them get wet with rainwater or seawater during transportation by ship or when unloaded, or are accumulated and stored in outdoor raw material yards. Get wet from the rain inside. Therefore, when it is necessary to dry these before consumption, they are generally spread outdoors and dried in the sun or ventilation, but this requires a sufficiently large area and drying is not possible. It was dependent on the weather, and the spreading and collecting work was largely done manually, creating various problems that needed to be solved. Furthermore, it is conceivable to carry out the above drying using fixed equipment, such as a rotary kiln, but this requires a large economic burden on the installation site and equipment, and also requires measures such as dustproofing, so it is not often used as a practical matter. .

The object of this invention is to be able to dry powder, granular materials, and lump materials by visiting their collection yards, and also to be able to proceed with the drying work while being transported depending on the location, without taking up much space. To provide a drying vehicle capable of efficient drying in a short time with little dust scattering.

That is, the drying vehicle for powder, granules, and lumps of the present invention uses a truck mixer as its main part, and the drum shaft of the truck mixer is provided with a through hole that communicates the inside and outside of the drum, and the engine room of the truck mixer is It also includes a blower device that sends preheated air into the drum through the holes, and further includes a heat exchanger that heats this air with the heat of the engine exhaust gas. Ru.

In this invention, the through hole is provided in the drum shaft part, but specifically, the shaft is made hollow along its central axis in the bearing part of the drum shaft, and this hollow space is used as a through hole to communicate the inside and outside of the drum. let

In addition, the engine room of a truck mixer is often surrounded by soundproofing material for soundproofing purposes, and therefore the air inside is usually about 100% due to the heat dissipated from the engine.
It is heated to 60℃ or higher. This preheated air is guided by a blowing fan to the through hole via a connecting pipe, and air from within the engine room is sent into the drum through the through hole. Inside the drum, the moist magnesia clinker and the like charged therein are scooped up and stirred by the rotation of the drum and the blades inside the drum, and then dried by dry hot air introduced through the holes. The warm air that has absorbed moisture escapes to the outside through the drum's outlet opening, but by controlling the fan so that the air volume does not increase too much, and by attaching a hood to the hopper of the drum's outlet opening, almost no dust is scattered. It will disappear.

According to another aspect of the invention, the relative dryness can be improved by further warming the air introduced from the engine room by the fan using the waste heat of the engine exhaust gas, and in this case, The engine exhaust gas is moist due to combustion and should not be mixed with the air entering the drum. For this reason, a heat exchanger that uses a part of the engine exhaust pipe as a heating pipe is placed in the supply air flow pipe, thereby further heating the supply air using the waste heat energy of the engine exhaust gas. It is warming.

Next, this invention will be explained with reference to the drawings of the embodiments.
In FIG. 1, a truck mixer 1 uses a truck mixer as an ordinary concrete mixer vehicle, and a bearing portion 3 of a drum shaft portion of a drum 2 is used as a truck mixer 1.
A through hole 4 is provided on the central axis of the drum shaft to communicate between the inside and outside of the drum,
A blower pipe 5 is connected to the ventilation hole 4 by a rotary joint or the like. Another pipe 7 is attached to communicate with the inside of the engine room 6, and its outlet is connected to the suction side of the blower fan 8. Air inside the engine room 6 can be blown inwards. In the heat exchanger 9, an engine exhaust gas pipe is arranged in the flow path from the blower fan 8 to the blower pipe 5, and the heat of the high temperature exhaust gas flowing in this pipe is applied to the air from the engine room. This is then heated and sent to the pipe 5. In the illustrated example, a pipe 10 from an engine exhaust muffler is connected to the internal pipe of the heat exchanger 9 via a flow distribution valve 11, and an outlet pipe of this pipe leads to an exhaust pipe 12. By operating the lever 13, the distribution valve 11 can switch the engine exhaust gas from the pipe 10 to the heat exchanger 9 or the exhaust pipe 12 and adjust the ratio to any intermediate value. ing. Therefore, by adjusting the distribution ratio using the lever 13 of the distribution valve 11, the entire engine exhaust gas can be passed through the heat exchanger 9 to reach the maximum heating state, or an appropriate amount can be diverted to the exhaust pipe 12 to adjust the heating. Alternatively, the entire amount of waste heat may be allowed to flow into the exhaust pipe 12 so that the incoming air is not heated by the heat exchanger 9, or any waste heat may be used in relation to the use of engine output.

In FIG. 1, reference numeral 14 denotes a hopper into which powder, powder, or lumps to be dried are charged;
Reference numeral 5 denotes a chute for discharging these dried granules from the drum opening, and the mechanism for charging and discharging them is no different from that of a general concrete mixer truck, but it is preferable that these parts be equipped with dustproof measures (not shown). The hood shall be covered.

As described above, according to the drying truck of the present invention, powders, granules, lumps, and mixtures thereof can be dried using the truck mixer.
Since air from the engine room is blown, dry air preheated by the heat of the engine can be blown into the drum, and it can also be further heated by exchanging heat with the engine exhaust gas. The drying truck can be driven to a collection yard for refractory raw materials to be dried and drying work can be carried out continuously on site, or the drying can be transported to another location while being dried.
This allows efficient drying work to be carried out at any location without the need for fixed equipment such as a rotary kiln.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of the present invention. 1: Truck mixer, 2: Drum, 4: Through hole,
6: engine room, 8: ventilation fan, 9: heat exchanger, 11: distribution valve, 12: exhaust pipe.

Claims (1)

[Scope of Claims] 1. The drum shaft portion of the truck mixer is provided with a through hole that communicates the inside and outside of the drum, and is equipped with an air blower that sends air from the engine room of the truck mixer into the drum through the hole. A dryer for drying powder, grains, and lumps. 2. A through hole is provided in the drum shaft portion of the truck mixer to communicate the inside and outside of the drum, and a blower device is provided to send air from the engine room of the truck mixer into the drum through the hole, and this air is used to remove engine exhaust gas. A drying vehicle for powder, granules, and lumps, characterized by being equipped with a heat exchanger that heats with heat.