JPH0452323B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to heating reclaimed materials including asphalt and aggregate with hot air in order to reuse asphalt and aggregate excavated, for example, during road construction. The present invention relates to an asphalt regenerating apparatus equipped with a regenerator and a hot air generating furnace that supplies hot air to the regenerator.

[Conventional technology]

Conventionally, none of the above-mentioned devices has taken into consideration both the deodorizing treatment of the exhaust gas from the regenerator and the improvement of thermal efficiency.

[Problem that the invention seeks to solve]

However, asphalt is heated in a recycling machine, it generates a bad odor, and deodorizing treatment is necessary from an environmental perspective.Additionally, in order to put asphalt reuse into practical use, it is necessary to keep the running costs required for heating, etc. low. This was necessary, and there was room for further improvement.

An object of the present invention is to reduce deodorizing treatment and lining costs by using rational means that comprehensively consider these factors.

[Means for solving problems]

The characteristic configuration of the present invention is to provide an exhaust gas path that supplies the entire amount of regenerator exhaust gas from the regenerator to the hot air generating furnace, and a discharge path that releases a part of the hot air from the hot air generating furnace as a discharge gas from the chimney. , a first heat exchanger that heats the regenerator exhaust gas in the exhaust gas path by the discharged gas in the discharge path; and a first heat exchanger that heats the regenerator exhaust gas in the exhaust gas path by the hot air from the hot air generating furnace. A second heat exchanger for heating is provided, and a third heat exchanger is provided for preheating the combustion air to the hot air generating furnace by the discharged gas of the discharge path, and its effects are as follows. That's right.

[Effect]

That is, the odor components generated by heating the asphalt in the regenerator are deodorized by thermal decomposition because the entire amount of regenerator exhaust gas from the regenerator is supplied to the high-temperature hot air generating furnace.

Furthermore, the regenerator exhaust gas from the regenerator is heated in the first and second heat exchangers before being supplied to the hot air generating furnace, and the combustion air is preheated in the third heat exchanger before being supplied to the hot air generating furnace. Since it is supplied, the hot air generating furnace can be maintained at an extremely high temperature, and odor components can be sufficiently thermally decomposed.

Furthermore, since the sensible heat of the gas released into the atmosphere can be recovered by the first and third heat exchangers, the loss of thermal energy due to exhaust gas can be sufficiently reduced, and operation with good thermal efficiency can be achieved.

〔Effect of the invention〕

As a result, it is possible to sufficiently prevent pollution caused by the release of malodorous components, and to sufficiently reduce running costs, making it possible to commercialize asphalt reuse by recycling asphalt in and near urban areas, and to reduce resource-saving costs such as road construction. , it has become possible to implement it advantageously in terms of waste disposal, pollution prevention, and cost.

〔Example〕

Next, examples will be shown with reference to drawings.

Mixture A of asphalt and aggregate, which has been excavated for road construction, etc. and then roughly sorted from rocks and earth, is supplied by a shovel loader 1, etc., and is transported by skip conveyor 2 and skip conveyor 2. A grizzly leaf feeder 3 that removes large lumps of about 50 cm square or more from the mixture, a quantitative cutting conveyor 6 that quantitatively supplies the mixture from the grizzly leaf feeder 3 from a hopper 4 to a conveyor 5 for lifting, and a conveyor 6 for lifting. Approximately 40 of the mixture from conveyor 5
A vibrating feeder 9 is provided which separates and supplies powder and granular materials (mainly earth and sand and pebbles) smaller than mm square to a collection conveyor 7 and supplies the remainder to a primary crusher 8.

A three-stage screen 11 is provided to screen the mixture supplied by the conveyor 10 from the primary crusher 8 into 5 mm or less, 5 to 13 mm, 13 to 20 mm, and 20 mm or more. Conveyors 12a, 12b, 12c from stage screen 11
Mixture B, 5 mm or less, each sent separately by
A stockyard 13 is provided to store mixture C of ~13 mm and mixture (D) of 13 to 20 mm. Incidentally, the stockyard 13 is designed to be able to store new aggregates such as thin ones _E1 and coarse ones _E2 .

In addition, a secondary crusher 14 for processing the mixture of 20 mm or more from the three-stage screen 11, and a conveyor 15 for returning the mixture processed by the secondary crusher 14 to the three-stage screen 11 are provided to remove all of the mixture. It is designed to crush into pieces of 20mm or less.

Hoppers 17a to 17e are provided to separately supply the mixtures B, C, D and new aggregates E ₁ and E ₂ from the stockyard 13 using a shovel loader 16, etc., and quantitative cutting conveyors 18a to 18e are used to supply the mixtures B, C, D and new aggregates E 1 and E 2 to appropriate hoppers 17a to 17e. Conveyors 19a and 19b with measuring machines are provided to measure the mixtures B, C, D and new aggregates E ₁ and E ₂ that are supplied in small quantities, and the mixtures B, C, D and new aggregates from these conveyors 19a and 19b are provided. A lifting conveyor 21 is provided to supply E ₁ and E ₂ to the regenerator 20.

The regenerator 20 is provided with a rotatable drum 20a that accommodates the regenerated material, and is configured to send the regenerated material to the hopper 22 while stirring it as the drum 20a rotates, thereby regenerating the hot air generating furnace 23. machine 20
Then, the hot air passage 24 connects the hot air of about 550 to 800°C so that it flows in parallel with the material to be recycled, and the regenerating machine 20
The structure is such that the asphalt is heated and melted and does not burn.

A heated asphalt tank 25, a softener tank 26, and a tank 27 for storing asphalt and softener supplied in appropriate amounts from both tanks 25 and ₂₆ by pumps P ₁ and P 2 are provided. Weighing machine 2 that supplies a fixed amount of recycled material
8, and the recycled material from the weighing machine 28 and the tank 27
A mixer 29 is provided to mix the asphalt and softener from the factory in an appropriate mixing ratio.

A tank 44 that heats and stores the recycled mixed material to be supplied to the transport vehicle 30, etc., a skip conveyor 31 that transports the recycled mixed material from the mixer 29 to the tank 44, and from the skip conveyor 31 to the transport vehicle 30, etc. A chute 32 is provided to directly supply recycled composite material.

The configuration for supplying hot air and treating exhaust gas to the regenerator 20 is shown below.

City gas, oil, etc. from the fuel path 33 are transferred to a blower.
Burner 2 that burns with air from the air passage 34 with _F1
3a is provided in a hot air generating furnace 23, and is configured to supply high temperature gas of about 800° C. from the hot air generating furnace 23 to a hot air path 24.

The entire amount of regenerator exhaust gas from the regenerator 20 is transferred to the hot air generating furnace 2.
3, a dust collector 36, a blower F ₂ , a first heat exchanger 37 and a second heat exchanger 38
is configured so that the odor components in the regenerator exhaust gas are thermally decomposed and deodorized in the hot air generating furnace 23, and the first heat exchanger is 37 is configured to heat the regenerator exhaust gas, and a second heat exchanger 38 is configured to heat the regenerator exhaust gas by the hot air in the hot air path 24.

A bypass path 24a for the second heat exchanger 38 is provided in the hot air path 24, and a bypass path 24a is provided for the second heat exchanger 38.
and a variable distribution device 41 that sets the hot air distribution ratio to the second heat exchanger 38, the regenerator 20, and the discharge path 4.
Variable distribution device 42 that sets the hot air distribution ratio to 0
is provided so that an appropriate amount of hot air at an appropriate temperature can be supplied to the regenerator 20.

A third heat exchanger 43 is provided to preheat the combustion air in the air passage 34 with the discharged gas in the discharge passage 40, and the burner 23
It is configured to increase the combustion temperature of a and lower the temperature of the emitted gas released into the atmosphere to suppress heat loss.

[Another example]

Next, another embodiment will be described.

Regenerator 20, hot air generator 23, first to third
The heat exchangers 37, 38, 43 and other specific configurations can be changed as appropriate.

The continuation position of the discharge path 40 may be between the hot air generating furnace 23 , the second heat exchanger 38 and the hot air generating furnace 23 .

In preparing the recycled material, various other changes are possible, such as preparing only the mixture B of 5 mm or less and the mixture C of 5 to 13 mm, or not mixing the new aggregate E ₁ or E ₂ .

In preparing the recycled composite material, various other changes can be made, such as omitting the addition of one or both of asphalt and a softener.

[Brief explanation of the drawing]

The drawing is a flow sheet illustrating an embodiment of the invention. 20...Regenerator, 23...Hot air generator, 35...
...Exhaust gas path, 37...First heat exchanger, 38...Second heat exchanger, 40...Discharge path, 43...Third heat exchanger.

Claims (1)

[Claims] 1. An asphalt regeneration device comprising a regenerator 20 that heats recycled materials including asphalt and aggregate with hot air, and a hot air generator 23 that supplies the hot air to the regenerator 20, wherein An exhaust gas passage 35 that supplies the entire amount of the regenerator exhaust gas to the hot air generation furnace 23, and a discharge passage 40 that discharges a part of the hot air from the hot air generation furnace 23 as a discharge gas from the chimney 39 are provided. a first heat exchanger 37 for heating the regenerator exhaust gas in the exhaust gas path 35 with the discharged gas in path 40;
A second heating of the regenerator exhaust gas in the exhaust gas path 35 by the hot air from the hot air generating furnace 23;
The asphalt regeneration apparatus is provided with a heat exchanger 38 and a third heat exchanger 43 for preheating the combustion air to the hot air generating furnace 23 by the discharged gas of the discharge path 40.