JPH0637041Y2 - Asphalt plant - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial field of application) The present invention relates to an asphalt plant that effectively utilizes the exhaust heat radiated from a dryer and a bag filter when heating aggregate. Is.

(Prior Art) Known technologies that utilize the radiated heat generated in an asphalt plant are those in which a bag filter is designed close to the upper part of the dryer, and one that makes use of a heat insulating plate for the supporting time of the bag filter. (See Jitsukō Sho 61-29767 and Jikkou Sho 61-29769).

The main purpose of these is to prevent the dew condensation of water vapor contained in the combustion gas whose ambient temperature of the bag filter is raised by the radiated heat around the dryer.

(Problems to be solved by the invention) However, in the conventional asphalt plant,
The radiated heat generated from the dryer is not used to heat the combustion air of the burner, so the combustion efficiency of the burner is low.

The purpose of this invention is to solve the problems of the conventional asphalt plant and to propose an asphalt plant devised so that exhaust heat can be utilized comprehensively and efficiently.

[Structure of the Invention] (Means for Solving the Problems) The structure of the present invention for solving the above-mentioned problems is to provide a dryer for an aggregate heating device of an asphalt plant and a bag filter for a dust collecting device around both sides. The partition wall is covered and the heated air around the wall is used as combustion air for a burner of a dryer.

In addition, the present invention covers the surroundings of both the dryer, which is the aggregate heating device of the asphalt plant, and the bag filter, which is the dust collector, with partition walls, and the heated air around the dryer is used for combustion in the burner of the dryer. Used as air,
And, at least the base of the blower for blowing dust and the blower piping for the dust collected by the bag filter,
It is arranged in the partition wall.

(Operation) The heat radiated from the surface of the dryer and bag filter is
The heated air in the space surrounded by the partition walls and heated in the space is used as primary air and secondary air for combustion of the burner to improve the combustion efficiency of the burner.
Further, the heated air raises the ambient temperature in the bag filter to prevent dew condensation of water vapor contained in the combustion gas.

Further, since the dust transfer blower and at least the base of the blower pipe are arranged in the partition wall, dew condensation on the dust transfer blower and the blower pipe is prevented, and the dust can be transferred without any trouble. It was

(Embodiment) Next, an embodiment of the present invention will be described with reference to the drawings.

The asphalt plant whose side view is shown in FIG. 1 and whose front view is shown in FIG. 2 has a dryer 1 for heating and drying the aggregate, a dust collector 3 for capturing dust scattered from the dryer 1, and a heated aggregate. It is composed of a plant body 5 for storing, weighing, and mixing, and other auxiliary equipment.

The dryer 1 is of a rotary kiln type, in which a cylindrical rotary cylinder 7 is rotatably supported on a base 9 about its inclined long axis, and is rotated at a predetermined speed by a drive device (not shown). ing. A large number of scraping blades are arranged inside the rotary cylinder 7, and the dryer 1 is provided by the transport device 11.
The hot air of the burner 15 is sent to the dryer 1 by the burner blower 17 while the aggregate fed into the cold hopper 13 is scraped up by the scraping blades and is rolled down in the rotary cylinder 7 while being dropped like a curtain. This hot air heats and raises the temperature of the aggregate in the dryer 1, and the heated aggregate is discharged from the hot hopper 19 and supplied to the plant body 5 via the hot elevator 21.

Combustion gas containing a large amount of dust generated when the aggregate 1 is heated in the dryer 1 is sucked by the exhaust fan 23 and introduced into the dust collector 3 from the cold hopper 13 through the flue 25.

The dust collector 3 is usually provided by connecting a dry cyclone for capturing coarse particles of dust to a bag filter having a large number of filter cloths for capturing fine particles of dust.

The dust collector 3 incorporating the bag filter is provided above the dryer 1 so as to be heated by the radiant heat radiated from the surface of the rotary cylinder 7 of the dryer 1.

The dust collected by the bag filter is sent to the vicinity of the rotary valve 31 by the screw 29 arranged at the bottom of the bag filter hopper 27, and the dust is blown from the rotary valve 31 to the blower pipe by the dust transfer blower 33.
It is sent via 35 to a hot bin 45 for dust storage.

A partition wall 39 is attached between two adjacent two of, for example, four support portions 37 of the dust collector 3, and the rotary cylinder 7 is attached by these partition walls 39.
Most of the bag filter hopper 27, screw 29,
The rotary valve 31, the dust transfer blower 33, and at least the base portion 41 of the blower pipe 35 (the side closer to the dust transfer blower 33) are covered, and the partition wall 39 is attached with a heat insulating material so as to cover the surface of the rotary cylinder 7. The heat is dissipated to keep the screw 29 and other parts warm.

Then, an opening 42 is provided above the partition wall 39, and the suction side of the burner blower 17 and this opening 42 are connected by a burner pipe 43, which is surrounded by the partition walls 39, 39, ... The heated air is supplied to the burner 15 through the burner pipe 43 as combustion air (primary air and secondary air).

The plant body 5 is equipped with a hot bottle 45, a mixer 47, and the like for sieving and storing the heated aggregate lifted by the hot elevator 21.

Since the illustrated asphalt plant is configured as described above, the heat radiated from the surfaces of the rotary cylinder 7 of the dryer 1 and the bag filter hopper 27 is stored in the partition wall 39 provided so as to surround the rotary cylinder 7. The air in the space is heated.

The heated air is supplied to the burner 15 as combustion air by the burner blower 17 via the opening 42 of the partition wall 39 and the burner pipe 43, and the combustion efficiency of the burner 15 is sufficiently enhanced.

In addition, the heated air in the partition wall 39 is supplied to the bag filter, the screw 29, the rotary valve 31, and the base portion 41 of the blower pipe 35.
Since it is possible to keep warm, etc., it is possible to prevent dew condensation in each part such as the screw 29 due to the water vapor contained in the combustion gas, and it is possible to use exhaust heat with less waste overall.

Furthermore, since the parts that generate a large amount of noise, such as the dryer 1 and the bag filter hopper 27, are surrounded by the partition wall 39,
The noise generated due to the agitating rolling of the aggregate in the rotary cylinder 7 is well prevented by the partition wall 39.

Since the dryer 1 and the bag filter hopper 27 are surrounded by the partition wall 39, the dryer 1 and the like are not exposed to rainwater or the like, the rust preventive effect is exhibited, and the service life of the dryer 1 or the like is improved. It

[Effect of the Invention] As apparent from the above, according to the configuration of the present invention,
The heat dissipated from the surface of the dryer and bag filter is
The air that has stayed in the space surrounded by the partition walls and is heated in this space is used as primary air and secondary air for combustion of the burner, and the combustion efficiency of this burner is improved. The generated air raises the ambient temperature in the bag filter and prevents the dew condensation of water vapor contained in the combustion gas, and this invention makes it possible to utilize waste heat comprehensively and with little waste.

Further, since the dust transfer blower and at least the base of the blower pipe are also arranged in the partition wall, dew condensation in the dust transfer blower and the blower pipe is prevented, and the dust is efficiently transferred.

Is prevented and the dust is efficiently transported.

It should be noted that the present invention has an excellent effect such that the partition wall covers the dryer and the bag filter from rainwater or the like and exhibits a sufficient rust preventive effect.

[Brief description of drawings]

1 is a side view of an asphalt plant according to an embodiment of the present invention, and FIG. 2 is a front view of FIG. 1 ... Dryer, 3 ... Dust collector 7 ... Rotating cylinder, 15 ... Burner 17 ... Burner blower 33 ... Dust transfer blower 35 ... Blower piping, 39 ... Partition 41 ... Base, 43 ... … Piping for burners

Claims (2)

[Scope of utility model registration request] 1. An asphalt plant, a dryer that is an aggregate heating device and a bag filter that is a dust collecting device are covered with partition walls around the periphery thereof, and the heated air around the dryer is used as combustion air for a burner of the dryer. An asphalt plant characterized in that it is configured to be used as. 2. Surroundings of both a dryer, which is an aggregate heating device for an asphalt plant, and a bag filter, which is a dust collector, are covered with partition walls, and the heated air around the dryer is used as combustion air for a burner of the dryer. Used as
An asphalt plant, characterized in that a blower for conveying dust collected by a bag filter and at least a base of a blower pipe thereof are arranged in the partition wall.