JPS585322B2 - Asphalt plant ventilation equipment - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a part of the main body tower consisting of a vibrating sieve, an aggregate intermediate hopper part, an aggregate measuring part, a part of a mixer, and their auxiliary equipment, a suction duct and a suction side of a burner blower of an aggregate dryer. This relates to an air exhaust system for asphalt plants, which is characterized by a conduit connection between the main body tower and the heated air generated in a part of the main body tower, which is used together with dust as part of the primary air required for the burner combustion of the aggregate dryer. By slightly increasing the combustion efficiency of the burner, and by generating negative pressure in a part of the main body tower with the burner blower, the amount of exhaust air introduced into the cyclone and bag filter after the aggregate dryer is reduced, and the The filtration area of the filter can be reduced and the size of the filter can be reduced.

Conventionally provided air exhaust systems for asphalt plants introduce the vibrating sieve in a part of the main body tower and the heated air generated in the aggregate measuring section together with dust into the air exhaust cyclone of the aggregate dryer. is introduced into the bag filter, the heated air generated in a part of the main body tower is not utilized and there is heat loss.Also, the primary air required for the burner combustion of the aggregate dryer is outside air, so the bug A large amount of exhaust air is introduced into the filter, which necessitates increasing the capacity of the bag filter's exhaust fan and making the bag filter larger, which has the disadvantage of increasing equipment costs and power consumption. As a result of various experimental studies, the present inventor has developed the present invention which does not have such drawbacks.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The conduit a opening into the vibrating sieve cover 6 of the main body tower part 5, which is made up of these auxiliary equipment, and the conduit suction opening into the measuring section 3 are connected to the suction pipe 9 of the burner blower 8 of the rotary aggregate dryer 7. The liquid area is supplied via a conduit c having a damper 10 to the liquid area.

11 is a damper that adjusts the amount of outside air taken into the intake pipe 9; 12 is a burner; and 13 is a fuel supply pipe.

Aggregates are inputted into the aggregate dryer 1 from an aggregate input port 14 and discharged from a heated aggregate discharge port 15, and the discharged heated aggregate is supplied to the vibrating sieve 1 by an appropriate transfer mechanism 16 such as a packet elevator. Ru.

Exhaust air from the aggregate dryer 7 is transferred to a cyclone 17 through a conduit d.
is introduced to separate the ducts.

The exhaust from the cyclone 17 is passed through the bag filter 1 through the conduit e.
8 , filtered and discharged to the outside air by an exhaust fan 19 .

The dust separated at the bottom of the bag filter 1B is collected in the rotary valve 21 by the dust screw 20, and introduced into the dust cyclone 23 through the conduit f by the air pressure feeder 22, and the exhaust air of the dust cyclone 23 is passed through the conduit g. It is introduced into conduit C via.

The dust from the dust cyclone 23 is collected in the lower dust intermediate hopper 24, and transferred to the measuring section 23 by an appropriate transfer mechanism 25.
The necessary stone powder is introduced into the stone powder measuring tank of
Introduce into the stone powder measuring tank.

27 is a molten asphalt supply pipe.

The measuring section 3 consists of an aggregate measuring tank, a stone powder measuring tank, and an asphalt measuring tank.

The present invention connects the suction duct of a part of the main body tower, which is made up of a vibrating sieve, an aggregate intermediate hopper section, an aggregate measuring section, a part of a mixer, and their auxiliary equipment, to the suction side of a burner blower of an aggregate dryer through a conduit. This is an air exhaust system for an asphalt plant, which is characterized by
, b.

It is sucked together with the outside air by the burner blower 8 through c and is used as the primary combustion air of the burner 12.
The outside air sucked in is heated by the heated air containing about 0.1% of the aggregate water content generated in the main tower part 5, which slightly increases the combustion efficiency of the burner and reduces the fuel consumption. Since the exhaust fan 19 for removing exhaust gas from the material dryer 7 does not suck in the heated air inside the main body tower 5, the amount of exhaust air is reduced, so the capacity of the cyclone 17 is reduced and the filtration area of the bag filter 18 is reduced. This makes it possible to reduce the capacity of the exhaust fan 19, reduce the required power, and reduce equipment costs. ,
The inside of the measuring section 3 becomes negative pressure by the burner blower 18,
The present invention can effectively prevent dust pollution by preventing the dust generated in these parts from leaking to the outside.
, the temperature of the heated air in the main body tower part 5 is set to 70 to 90°C and the humidity is 3.5 to 7.5%, and the air necessary for combustion is converted to 2/3 outside air and the main body tower part 5 by the burner blower 8. If 1/3 of the heated air is sucked in, the temperature of the primary air for combustion will be 33 to 40 degrees Celsius, and the humidity will be 15 to 25%, which will improve the combustion efficiency, although it is slight. Since there is no need to create negative pressure inside the tower part 5,
The amount of exhaust air can be reduced by 15 to 20% compared to conventional equipment, and the cyclone 17, bag filter 18, and exhaust fan 19
The capacity of the asphalt plant can be reduced by 15 to 20%, and the equipment cost of the entire asphalt plant can be reduced by 4.5 to 6.0%.

[Brief explanation of the drawing]

The drawing is a layout diagram. 1... Vibration sieve, 2... Bone aggregate quantity hopper part, 3... Lumber measuring material part quantity 4... Mixer part, 5... Main body tower part, 7... Aggregate dryer, 8... Bar blower, a. b. c... Conduit.

Claims (1)

[Claims] 1. A conduit connects the suction duct of a part of the main tower consisting of the vibrating sieve, aggregate intermediate hopper section, aggregate measuring section, part of the mixer, and their auxiliary equipment to the suction side of the burner blower of the aggregate dryer. Asphalt plant ventilation equipment.