JPH08311809A - Asphalt mixture manufacturing device - Google Patents

Abstract

PURPOSE: To perform heat recovery efficiently due to a configuration of an inexpensive device. CONSTITUTION: A deodorization furnace 4 is connected to a new material dryer 1. An exhaust air smoke passage 20 for waste material dryer of a waste material dryer 13 is connected to the deodorization furnace 4 of the new material dryer 1. An exhaust air smoke passage 9 for new material dryer of the new material dryer 1 is branched on an outlet side of a bag filter 11 to connect a return smoke passage 23, and the other end of the smoke passage is connected to a combustion chamber 17 of the waste material dryer 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an asphalt mixture manufacturing apparatus provided with an asphalt plant for manufacturing an asphalt mixture which is a road paving material and a recycling plant for heating and regenerating waste asphalt paving material.

[0002]

2. Description of the Related Art Waste asphalt pavement materials (hereinafter referred to as "waste materials") dug up by road construction, etc., are heated and recycled and reused as an asphalt mixture. As a device for heating this waste material, a new aggregate material is used. A dryer with almost the same structure as an asphalt plant dryer (hereinafter referred to as “new material dryer”) that heats the waste is often used, and this dryer for heating waste material (hereinafter referred to as “waste material dryer”) is similar to the new material dryer. Often set up.

When a waste material having an asphalt content adhered thereto is heated by a waste material drier, an offensive odor gas is generated depending on the heating conditions, which may cause a bad smell near the plant and cause a problem that cannot be ignored in terms of pollution.

Therefore, in order to remove the odorous components in the exhaust gas, the exhaust flue of the waste material dryer is connected to a deodorizing furnace, the exhaust gas containing the odorous components derived from the waste material dryer is sent to the deodorizing furnace, and the odorous component is removed by the deodorizing furnace. It is also proposed to burn. At this time, the temperature of the exhaust gas discharged from the deodorizing furnace is as high as around 800 ° C, and cooling this at the end and dissipating it in the atmosphere wastes heat energy and heat is generated by a heat exchanger or the like. When recovered, the thermal efficiency is considerably improved, but the equipment is expensive and the economic burden is large.

For this reason, there has been proposed a method in which high-temperature exhaust gas discharged from a deodorizing furnace is introduced into a new material dryer.

[0006]

However, although the high temperature exhaust gas discharged from the deodorizing furnace is introduced into the new material dryer as in the above-mentioned conventional example, considerable heat recovery is performed, but the new material dryer is used. Exhaust gas, which still has a considerable amount of heat, is emitted from the chimney, and there is still room for improvement in order to save energy. If the heat exchanger is adopted for heat recovery as described above, it is expensive and has a large economical burden. In view of the above points, an object of the present invention is to provide an asphalt mixture manufacturing apparatus in which heat recovery of an apparatus employing a deodorizing furnace is performed as cheaply as possible to achieve energy saving.

[0007]

In order to achieve the above object, the present invention provides a new material dryer for heating a new aggregate and a waste material dryer for heating a waste material in parallel, and one end portion of the new material dryer is provided. A deodorizing furnace that burns the odorous components in the exhaust gas is connected to the exhaust flue for the new material dryer that guides the exhaust gas to the other end, and the exhaust flue for the new material dryer is equipped with a bag filter and an exhaust fan. While connecting to the chimney, a combustion chamber is connected to one end of the waste material dryer, and a waste material dryer exhaust flue for exhaust gas discharge is connected to the other end, and the waste material dryer exhaust flue is connected to the deodorizing furnace. The exhaust flue for the new material dryer is branched at the outlet side of the bag filter to connect the return flue, and the return flue is connected to the combustion chamber of the waste material dryer.

[0008]

In the apparatus for producing an asphalt mixture according to the present invention, the exhaust gas containing the odorous component generated from the waste material dryer when the waste material is heated is introduced into the deodorizing furnace connected to the new material dryer by the exhaust flue for the waste material dryer. In the deodorization furnace, the odorous components are burned to deodorize and then the high-temperature exhaust gas is led to the new material dryer to heat the new aggregate. The exhaust gas discharged from the new material dryer is introduced into the bag filter by the exhaust flue for the new material dryer. After the dust content is removed by the bag filter, the exhaust gas passes through the chimney and is released into the atmosphere.However, most of the exhaust gas from the bag filter still retains a considerable amount of heat, so most of it is The exhaust flue for the new material dryer on the outlet side is branched to a return flue, which is connected to the exhaust flue, and is returned to the combustion chamber side of the waste material dryer by the return flue to recover the amount of heat retained therein.

[0009]

An embodiment of the present invention will be described below with reference to the drawings.

Reference numeral 1 denotes a new material dryer for heating a new aggregate, which is of a rotary kiln type and rotatably supports a cylindrical drum 2 having a large number of scraping blades around its inner peripheral portion. , Is rotated at a predetermined speed by a driving device (not shown).

Reference numeral 3 denotes a hot hopper provided at one end of the drum 2, and a deodorizing furnace 4 for burning odorous components in exhaust gas is provided on the hot hopper 3 side. The deodorizing furnace 4
Is equipped with a deodorizing burner 6 in a cylindrical furnace body 5 and heats the exhaust gas sent to the deodorizing furnace 4 with a combustion gas of about 800 ° C. for 1 second or more to burn the odorous components in the exhaust gas. I try to deodorize.

Reference numeral 7 denotes a cold hopper provided at the other end of the drum 2, and an aggregate supply conveyor 8 for supplying new aggregate into the drum 2 is provided in the cold hopper, and at the same time, inside the drum 2. The exhaust flue 9 for a new material dryer for discharging the exhaust gas of
An exhaust fan 10 for sucking and exhausting the exhaust gas discharged from the drum 2 and a bag filter 1 for collecting dust in the exhaust gas.
1 is installed. The tip of the exhaust flue 9 for the new material dryer is connected to a chimney 12 that diffuses the exhaust gas into the atmosphere.

Reference numeral 13 denotes a waste material dryer for heating and regenerating waste material, which has a structure substantially the same as that of the new material dryer 1.
The cylindrical drum 14 is supported so as to be inclined and rotatable.
A hot hopper 15 is provided at one end of the drum 14,
A burner 16 is provided on the hot hopper 15 side, a combustion chamber 17 for forming a flame is provided in front of the burner 16, and a waste material supply conveyor 18 for supplying waste material into the drum 14 is provided. .

Further, a cold hopper 19 is arranged at the other end, and an exhaust flue 20 for a waste material dryer for discharging the exhaust gas in the drum 14 is connected to the cold hopper 19, and an exhaust gas for the waste material dryer is exhausted. The flue 20 is provided with an exhauster 21 for sucking and exhausting exhaust gas discharged from the drum 14, and a cyclone dust collector 22 which is a dry dust collector for collecting dust in the exhaust gas. The tip of the exhaust flue 20 for the waste material dryer is connected to the upstream side of the deodorizing furnace 4 arranged in the new material dryer 1, and the exhaust gas containing the odorous component derived from the waste material dryer 13 is introduced into the deodorizing furnace 4. I am trying to do it.

Further, the exhaust flue 9 for the new material dryer is branched at the outlet side of the bag filter 11, and the return flue 23 is connected to the branch portion, and the return flue 23 is connected to the return flue 23. An exhaust fan 24 that sucks and exhausts the exhaust gas passing through the passage 9 is provided, and the flue tip is connected to the upstream side of the combustion chamber 17 of the waste material dryer 13 and extracted from the exhaust flue 9 for the new material dryer. Waste gas dryer 13
I'm trying to return to the side. The exhaust gas may be used as burner combustion air.

Further, as shown by the dotted line in the figure, the number of branches of the exhaust flue 9 for new material dryer is increased by one, the second return flue 25 is connected to the branch, and the exhaust fan 26 is interposed. Then, the tip of the flue may be connected to the upstream side of the deodorizing furnace 4 of the new material dryer 1 so that the exhaust gas extracted from the exhaust flue 9 for the new material dryer 1 is also returned to the new material dryer 1 side. .

Further, reference numerals 27, 28, 29 and 30 denote flow rate adjusting dampers arranged in the respective flues for adjusting the amount of exhaust gas passing through the respective flues.

When the asphalt mixture manufacturing apparatus of the present invention heats and regenerates new aggregate and waste material, the exhaust gas containing the odorous components derived from the waste material dryer 13 passes through the waste material dryer exhaust flue 20 to the new material dryer 1. The odorous components in the exhaust gas are introduced into the connected deodorization furnace 4 and contacted with the high temperature gas for a predetermined time to be heated and burned, and decomposed into water and carbon dioxide gas to be deodorized. The exhaust gas deodorized in this way is introduced into the new material dryer 1 and used for heating the new material. The exhaust gas obtained by heating the new aggregate is introduced into the bag filter 11 through the exhaust flue 9 for the new material dryer,
Here, after the dust content in the exhaust gas is removed, the exhaust gas exiting the bag filter 11 still retains a considerable amount of heat, and most of it is sucked into the return flue 23 side here and the waste material dryer 13 The amount of heat retained by being returned to the combustion chamber 17 is recovered as much as possible.

At this time, when the second return flue 25 shown by the dotted line is provided, the exhaust gas discharged from the bag filter 11 is returned to the new material dryer 1 side by the second return flue 25. You may do it.

[0020]

As described above, in the asphalt mixture manufacturing apparatus according to the present invention, the deodorizing furnace 4 is connected to the new material dryer 1, and the exhaust flue 20 for the waste material dryer is connected to the waste material dryer. While connecting to the deodorizing furnace 4, the exhaust flue 9 for the new material dryer is branched at the outlet side of the bag filter to connect the return flue 25, and the tip of the return flue 25 is connected to the combustion chamber of the waste material dryer 13. Since it is connected to 17, the exhaust gas containing the odorous component derived from the waste material dryer 13 can be burned in the deodorizing furnace 4 to deodorize, and the amount of heat of the high temperature gas generated at the time of deodorizing can be used for heating the new aggregate material of the new material dryer 1 and the waste material. The waste material can be recovered by heating and recycling in the dryer 13, and the heat in the exhaust gas can be recovered economically and efficiently without using an expensive device such as a heat exchanger for heat recovery. Kill.

[Brief description of drawings]

FIG. 1 is a flow chart showing an embodiment of an asphalt mixture manufacturing apparatus according to the present invention.

[Description of sign]

1 ... New material dryer 4 ... Deodorizing furnace 9 ... New material dryer exhaust flue 10 ... Exhaust air blower 11 ... Bug filter 13 ... Waste material dryer 17 ... Combustion chamber 20 ... Waste material dryer exhaust flue 21 ... Exhaust air blower 22 ... Cyclone dust collector (Dry dust collector) 23 ... Return flue 24 ... Exhaust fan

Claims (1)

[Claims] 1. A new material dryer for heating a new aggregate and a waste material dryer for heating a waste material are arranged in parallel, and a deodorizing furnace for burning an odor component in exhaust gas is provided at one end of the new material dryer and at the other end. Connect the exhaust flue for a new material dryer that derives exhaust gas,
The exhaust flue for the new material dryer is connected to the chimney through a bag filter and an exhaust fan, while the combustion chamber is provided at one end of the waste material dryer, and the exhaust flue for the waste material dryer is provided at the other end. The exhaust flue for the waste material dryer is connected to the deodorizing furnace, and the return flue is connected by branching the outlet side of the bag filter of the exhaust flue for the new material dryer. An asphalt mixture manufacturing device characterized by being connected to the combustion chamber of a waste material dryer.