JP2001003309A - Asphalt composite material-manufacturing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to stably operate a new material drier even when there are variations in temperature or quantity of exhaust-gas for a scrap material drier introduced to the new material drier side in an asphalt composite material- manufacturing device introducing exhaust-gas for the scrap material drier to a burner side of the new material drier. SOLUTION: This asphalt composite material-manufacturing device is equipped with a gas quantity detection device for detecting a quantity of a scrap material drier 14 and a gas temperature sensor 30 for detecting an exhaust-gas temperature. It is also equipped with an exhaust-gas quantity calculation device 33 for calculating a holding quantity of exhaust-gas from the detected gas quantity and gas temperature and a burner combustion control device 34 increasing and decreasing a burner combustion quantity of a new material drier 1 based on output value of the exhaust-gas quantity calculation device 33. Holding quantity of exhaust-gas is calculated from the quantity and temperature of exhaust-gas detected by the gas quantity detection device and gas temperature sensor 30, a quantity of variation of the holding quantity is adjusted by combustion quantity of the burner 3 for the new material drier 1, and the total quantity supplied to the inside of a drum 2 is properly controlled to supply it neither too much nor too little.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for manufacturing an asphalt mixture as a road pavement material, and more particularly, to a new material dryer for heating new aggregate and a waste material dryer for heating asphalt pavement waste material. The present invention relates to an asphalt mixture production apparatus.

[0002]

2. Description of the Related Art Waste asphalt pavement material (hereinafter referred to as "waste material") excavated by road construction or the like is heated and regenerated, mixed with new aggregate (hereinafter referred to as "new material") and reused as asphalt mixture. In addition, a new material dryer for heating new material and a waste material dryer for heating waste material are often provided side by side. When waste material is heated by a waste material dryer, an exhaust gas with a bad smell is generated depending on the heating condition. Therefore, as described in Japanese Patent Publication No. 3-9241, the exhaust flue of the waste material dryer is connected to the burner side of the new material dryer. There is one in which exhaust gas from a waste material dryer is introduced into a new material dryer, and odor components in the exhaust gas are burned to deodorize.

[0003]

However, just by connecting the exhaust flue of the waste material dryer to the burner side of the new material dryer as in the above-described conventional apparatus, the temperature or amount of the exhaust gas of the waste material dryer varies. The aggregate heating in the new material dryer is disturbed, and the temperature of the heated aggregate becomes unstable.

[0004] In view of the above, the present invention provides an asphalt composite material manufacturing apparatus that enables the new material dryer to operate stably even when the temperature and amount of exhaust gas from the waste material dryer introduced to the new material dryer fluctuate. The task is to provide.

[0005]

In order to solve the above-mentioned problems, the present invention provides a new material dryer for heating new material and a waste material dryer for heating waste material, and a new exhaust flue for the waste material dryer. In an asphalt mixture production device that connects the burner side of the material dryer to the waste material dryer and introduces exhaust gas from the waste material dryer into the new material dryer, gas amount detection means for detecting the amount of waste gas from the waste material dryer and gas temperature for detecting the temperature of the exhaust gas With a sensor, exhaust gas calorie calculation means for calculating the amount of heat held by the exhaust gas from the detected gas amount and gas temperature,
It is characterized by comprising a combustion amount control means for increasing or decreasing the burner combustion amount of the new material dryer based on the output value of the exhaust gas calorie calculation means.

[0006] Further, the invention is characterized in that an exhaust fan disposed in the exhaust flue of a waste material dryer is provided with an inverter for controlling the air volume, and the amount of exhaust gas is obtained from frequency data of the inverter as gas amount detecting means.

Further, a differential pressure sensor for detecting a differential pressure in the exhaust flue is provided between the upstream side and the downstream side of the exhaust fan disposed in the exhaust flue of the waste material dryer as a gas amount detecting means. The feature is that the amount of exhaust gas is determined from the pressure.

In addition, a flow meter is provided in the exhaust flue of the waste material dryer as a gas amount detecting means.

[0009]

According to the asphalt mixture manufacturing apparatus of the present invention, the exhaust gas generated in the waste material dryer is sent to the burner side of the new material dryer. And the exhaust gas temperature is sequentially detected by a gas temperature sensor. The detected exhaust gas amount and exhaust gas temperature are taken into the exhaust gas calorie calculating means, and the calorie of the exhaust gas is calculated by the exhaust gas calorie calculating means.

On the other hand, in the burner combustion control in the new material dryer, the temperature of the heated aggregate discharged from the new material dryer is detected by an aggregate temperature sensor, and the detected value is set to a preset aggregate temperature. The burner combustion amount is controlled based on the difference value so as to reach the set aggregate temperature. However, the burner combustion control is further controlled in consideration of the calculated calorific value of the exhaust gas. In other words, if the amount of exhaust gas or exhaust gas temperature introduced into the new material dryer increases, the total calorie due to the burner and exhaust gas in the new material dryer increases. Decrease by the amount. If the amount of exhaust gas and the temperature introduced into the new material dryer decrease, the burner combustion amount is increased by the reduced amount of heat.

As described above, by reflecting the amount of heat of the exhaust gas introduced into the new material dryer in the burner combustion control of the new material dryer, even if the amount or temperature of the exhaust gas introduced into the new material dryer fluctuates. By controlling the total amount of heat supplied to the new material dryer, stable operation can be performed, and the temperature of the heated aggregate can be stabilized.

Further, if an exhaust fan arranged in the exhaust flue of the waste material dryer is provided with an inverter for controlling the air volume and the amount of exhaust gas is calculated from the frequency data of the inverter as gas amount detecting means, the new material dryer can be used. The amount of exhaust gas to be introduced can be sequentially grasped, and the calorific value of the exhaust gas can be obtained from the amount of exhaust gas and the temperature of the exhaust gas, and the amount of combustion can be appropriately controlled by reflecting it in the burner combustion control of the new material dryer.

Further, a differential pressure sensor for detecting a differential pressure in the exhaust flue is provided between the upstream side and the downstream side of the exhaust fan disposed in the exhaust flue of the waste material dryer as a gas amount detecting means. By calculating the amount of exhaust gas from the pressure, the amount of exhaust gas introduced into the new material dryer can be grasped sequentially, and the calorific value of the exhaust gas can be calculated from this amount of exhaust gas and the temperature of the exhaust gas, and reflected in the burner combustion control of the new material dryer. The amount of combustion can be properly controlled.

If a flow meter is provided in the exhaust flue of the waste material dryer as a gas amount detecting means, the amount of exhaust gas introduced into the new material dryer can be grasped sequentially, and the calorific value of the exhaust gas can be determined from the amount of exhaust gas and the temperature of exhaust gas. Can be calculated and reflected in the burner combustion control of the new material dryer, so that the combustion amount can be appropriately controlled.

[0015]

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

In FIG. 1, reference numeral 1 denotes a new material dryer of an asphalt plant for heating and drying the new material, which rotatably inclines and supports a cylindrical drum 2 in which a number of scraping blades are provided. It is rotated at a predetermined speed by a device (not shown).

Reference numeral 3 denotes a burner provided upstream of the hot hopper 4 of the new material dryer 1, which forms a flame in the combustion chamber 5 and sends the hot air to the drum 2, while a conveyor provided on the cold hopper 6 side. The new material is supplied through the hopper 7, and the new material is heated to a predetermined temperature and discharged from the aggregate discharge port 8 below the hot hopper 4 while being rolled down while being scraped up by the blades.

The cold hopper 6 of the new material dryer 1
An exhaust flue 9 for discharging exhaust gas is connected to the exhaust gas, and an exhaust fan 10 for sucking the exhaust gas, a bag filter 11 for removing dust in the exhaust gas, and a chimney 12 for discharging the exhaust gas to the atmosphere are provided downstream thereof. ing.

Reference numeral 13 denotes a damper for adjusting the air volume disposed upstream of the exhaust fan 10, which detects the static pressure at the inner corner of the hot hopper 4 of the new material dryer 1 by a static pressure sensor and increases the static pressure substantially. Open / close control is performed so as to maintain the pressure to about the atmospheric pressure, and extra air outside the gap between the hot hopper 4 and the drum 2 is not sucked in so as to suck and exhaust an amount corresponding to the amount of gas sent into the drum 2. I have.

Reference numeral 14 denotes a waste material dryer for heating and regenerating the waste material, which has a structure substantially similar to that of the new material dryer 1, and rotatably rotates a cylindrical drum 15 having a number of scraping blades provided therein. It is supported at an angle, and is rotated at a predetermined speed by a driving device (not shown).

A burner 16 is provided at one end of the drum 15, and a flame is formed in a combustion chamber 17 in front of the burner 16 so that hot air is sent from the hot hopper 18 into the drum 15. The waste material is supplied from the hot hopper 18 side by the conveyor 19, and is heated to a predetermined temperature while rolling down the inside of the drum 15 while being scraped up by the scraping blades.
Discharge from 1.

An exhaust flue 22 is connected to the cold hopper 20 of the waste material dryer 14, and a cyclone dust collector 23 and a blower 24 are disposed in the exhaust flue 22, and the other end of the new material dryer 1 is connected. It is connected to the upstream side of the combustion chamber 5. The exhaust flue 22 may be connected to the hot hopper 4 of the new material dryer 1 without disposing the combustion chamber 5, but the combustion chamber 5 is disposed and the exhaust gas is introduced into the combustion chamber 5. It is preferable that the odor component in the exhaust gas be burned to increase the deodorizing effect.

A circulation flue 25 is also connected to the cold hopper 20 of the waste material dryer 14, and a cyclone dust collector 26 and a blower 27 are arranged in the middle of the circulation flue 25. The waste material dryer 14 is connected to the upstream side of the combustion chamber 17 via a damper 28. Then, a part of the combustion gas whose temperature has been lowered by adjusting the opening degree of the air volume adjustment damper 28 is circulated, mixed with the hot air of the burner 16 to adjust the hot air temperature, and to effectively use the heat of the combustion gas. .

Reference numeral 29 denotes an inverter (frequency converter) provided in the exhaust fan 24 of the exhaust flue 22 of the waste material dryer 14, and the amount of combustion of the burner 16 is adjusted according to fluctuations in the temperature of the waste material heated by the waste material dryer 14. When the amount of combustion gas fed into the drum fluctuates, the frequency of the frequency converter 29 is changed and controlled accordingly to change the rotation speed of the exhaust fan 24, and the amount of gas corresponding to the amount of exhaust gas generated is changed. Is sucked and exhausted. Since the exhaust gas amount can be obtained from the frequency set in the inverter 29,
The inverter 29 is used as gas amount detecting means.

Reference numeral 30 denotes a gas temperature sensor provided in the exhaust flue 22, which detects the temperature of the exhaust gas introduced from the waste material dryer 14 to the new material dryer 1. Reference numeral 31 denotes an aggregate temperature sensor provided at the aggregate outlet 8 of the new material dryer 1, which detects the temperature of the aggregate heated by the new material dryer 1.

Numeral 32 denotes a burner combustion control device for controlling the combustion amount of the burner 3 of the new material dryer 1, and an exhaust gas calorie calculation means 3 for calculating the calorific value of the exhaust gas of the waste material dryer 14.
3, a combustion amount control means 34 for controlling the combustion amount of the new material burner 3, an aggregate temperature setting unit 35 for setting a temperature set value of the heated aggregate, a storage unit 36, and the like. The exhaust gas calorie calculating means 33 sequentially acquires frequency data from the inverter 29 and gas temperature data from the gas temperature sensor 30, obtains an exhaust gas amount from data relating to the set frequency of the inverter and the exhaust gas amount, and obtains an exhaust gas amount from the exhaust gas amount and the gas temperature. The program is programmed to calculate the amount of heat held, and calculate the amount of change in the amount of heat from the amount of heat and the amount of heat at the time of the previous detection stored in the storage unit 36.

The combustion amount control means 34 compares the heated aggregate temperature taken in by the aggregate temperature sensor 31 with the aggregate temperature set value set in the aggregate temperature setting section 35, and based on the difference value. In order to control the burner combustion amount so that the aggregate temperature approaches the set value, the burner combustion amount to be increased or decreased is determined, and the fluctuation amount of the retained heat amount of the exhaust gas calculated by the exhaust gas heat amount calculation means 33 is taken. After converting the fluctuation amount into an oil amount, the fluctuation amount is added to or subtracted from the determined burner combustion amount to determine a final burner combustion amount, and based on the determined burner combustion amount, a new material burner 3 is determined. It is programmed to control combustion.

Next, the operation of the burner combustion control of the asphalt mixture manufacturing apparatus will be described with reference to the flowchart of FIG. Note that S1 to S10 in the figure represent steps of each operation.

In the above asphalt mixture manufacturing apparatus, when the new material dryer 1 is operated alone, the drum 2
The temperature of the heated aggregate discharged from the aggregate outlet 8 is sequentially detected by the aggregate temperature sensor 31 and the burner combustion control device 3
2, the temperature data detected by the combustion amount control means 37 is compared with the set value set in the aggregate temperature setting section 35, the combustion amount is appropriately determined based on the difference value, and the determined combustion amount is determined. Is applied to the burner 3 to adjust the amount of combustion.

When the waste material dryer 14 is operated during the operation of the new material dryer 1 and the exhaust gas of the waste material dryer 14 is introduced into the combustion chamber 5 on the side of the new material dryer 1, first, as shown in FIG. When the air volume of the exhaust fan 24 is controlled by the inverter 29, the frequency data of the inverter 29 is taken into the burner combustion control device 32 at a predetermined cycle, and the exhaust gas heat amount calculating means 33 is detected.
Then, the exhaust gas amount is obtained from the relation data between the set frequency of the inverter and the exhaust gas amount (S1). In addition, the gas temperature sensor 3
At 0, the exhaust gas temperature is also detected and taken into the burner combustion control device 32 (S2).

When the exhaust gas amount and the exhaust gas temperature are grasped, the exhaust gas calorie calculating means 33 calculates the heat amount of the exhaust gas from the exhaust gas amount, the exhaust gas temperature and the specific heat of the exhaust gas (S3). The amount of change in the heat quantity of the exhaust gas is calculated from the heat quantity and the heat quantity of the exhaust gas stored in the storage unit 36 at the previous detection (S4).

Next, the temperature of the heated aggregate discharged from the aggregate outlet 8 of the drum 2 is detected by the aggregate temperature sensor 31 and is taken into the burner combustion controller 32 (S5). Then, the aggregate temperature detected by the combustion amount control means 34 is compared with the set value set and stored in the aggregate temperature setting section 35 to calculate the difference value (S6), and the burner is calculated based on the difference value. The combustion amount of No. 3 is determined (S7).

Subsequently, the fluctuation amount of the calorific value of the exhaust gas calculated by the exhaust gas calorie calculating means 33 is calculated by the combustion amount control means 3.
The burner combustion amount is corrected by reflecting the fluctuation amount of the retained heat amount of the exhaust gas to the combustion amount of the burner 3 (S8).
For example, when the aggregate temperature is stable and the exhaust gas amount or the exhaust gas temperature rises and the retained heat amount becomes larger than that at the time of the previous detection, if the burner combustion amount is left as it is, it is discharged from the drum 2. The temperature of the heated aggregate will gradually increase. Therefore, if the amount of heat of the exhaust gas increases, the burner combustion amount is reduced by an amount corresponding to the amount of heat and the total amount of heat supplied into the drum 2 is controlled to be constant, so that the temperature of the heated aggregate is stabilized. be able to.
When correcting the burner combustion amount based on the fluctuation amount of the retained heat amount of the exhaust gas, it is preferable that the fluctuation amount of the retained heat amount of the exhaust gas is converted into oil, and the converted amount is added to or subtracted from the burner combustion amount to be corrected.

When the burner combustion amount is corrected, the combustion amount control means 34 applies a correction signal to the burner 3 to control the burner combustion amount (S9). If the combustion control is not completed (S10), the process returns to step S1 to repeat the same operation as described above.

In the above-described embodiment, the amount of exhaust gas from the waste material dryer 14 is determined by the frequency signal of the inverter 29 of the exhaust fan 24. However, as shown in FIG. When the exhaust gas amount is adjusted by the air amount adjusting damper 38 disposed upstream of the exhaust fan 24, the exhaust gas
Pressure sensor 38 for detecting the differential pressure between the upstream side and the downstream side of
The differential pressure data detected by the differential pressure sensor 38 is taken into the burner combustion control device 32, and the exhaust gas calorie calculating means 33 can calculate the exhaust gas amount from the differential pressure data by using the performance characteristic unique to the exhaust fan. If you program to
In the same manner as described above, the amount of heat of the exhaust gas can be calculated, and the amount of heat of the exhaust gas can be reflected in the control of the amount of combustion of the burner 3 to control the amount of combustion.

Further, as shown in FIG. 4, a flow meter 40 is provided downstream of the exhaust fan 24 as exhaust gas amount detecting means, and the flow rate data detected by the flow meter 40 is supplied to the burner combustion control device 3.
2, the amount of exhaust gas can be calculated from the flow rate data to calculate the retained heat amount of the exhaust gas in the same manner as described above, and the retained heat amount of the exhaust gas can be reflected in the combustion amount control of the burner 3 to control the combustion amount. it can.

As described above, the amount of heat held by the exhaust gas of the waste material dryer 14 is grasped, and the fluctuation of the amount of heat held by the exhaust gas is adjusted by the burner combustion amount of the new material dryer 1.
By appropriately controlling the total amount of heat to be sent into the inside and feeding the necessary amount of heat to the new-material dryer 1 without excess or deficiency, a stable operation with little temperature fluctuation of the heated aggregate can be performed. The amount of heat required for heating the aggregate is sequentially calculated from the amount of aggregate supplied to the new material dryer 1 and the set temperature of the heated aggregate, and the remaining amount of heat obtained by subtracting the amount of heat held by the exhaust gas from the required amount of heat is used as the burner. It is also possible to supply without excess or shortage by combustion.

Further, by effectively utilizing the amount of heat held by the exhaust gas of the waste material dryer 14, the combustion amount of the burner 3 of the new material dryer 1 can be suppressed, and the fuel cost can be reduced.

[0039]

As described above, according to the asphalt mixture manufacturing apparatus of the present invention, the exhaust flue of the waste material dryer is connected to the burner side of the new material dryer, and the exhaust gas of the waste material dryer is introduced into the new material dryer. The asphalt mixture production equipment to be introduced is equipped with a gas amount detector that detects the amount of exhaust gas from the waste material dryer and a gas temperature sensor that detects the temperature of the exhaust gas, and calculates the amount of heat held by the exhaust gas from the detected gas amount and the gas temperature. Exhaust gas calorie calculation means, and combustion amount control means for increasing or decreasing the burner combustion amount of the new material dryer based on the output value of the exhaust gas calorie calculation means. Adjust by the burner burner of the dryer, properly control the total amount of heat sent into the drum, and continue to send the required amount of heat without excess or shortage Even if the amount and temperature of exhaust gas from the waste material dryer fluctuate, the new material dryer side is not affected, and stable operation with little fluctuation in aggregate temperature can be performed, heating efficiency is improved, and fuel cost is improved. Can be reduced.

Further, since the exhaust fan disposed in the exhaust flue of the waste material dryer is provided with an inverter for controlling the amount of exhaust gas, and the amount of exhaust gas is obtained from the frequency data of the inverter as gas amount detecting means, the amount of exhaust gas can be grasped sequentially. The amount of heat held by the exhaust gas can be calculated, and the amount of heat can be reflected in the amount of combustion of the burner to control the amount of combustion appropriately.

As a gas amount detecting means, a differential pressure sensor for detecting a differential pressure in the exhaust flue is provided between the upstream side and the downstream side of the exhaust fan disposed in the exhaust flue of the waste material dryer. Since the amount of exhaust gas is determined from the pressure, the amount of exhaust gas can be sequentially grasped and the amount of heat possessed by the exhaust gas can be calculated. This can be reflected in the amount of combustion of the burner to control the amount of combustion appropriately.

Further, since a flow meter is provided in the exhaust flue of the waste material dryer as a gas amount detecting means, the amount of exhaust gas can be sequentially grasped and the amount of heat held by the exhaust gas can be calculated, and this is reflected in the burner combustion amount. The amount of combustion can be properly controlled.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing one embodiment of an asphalt mixture production apparatus according to the present invention.

FIG. 2 is a flowchart illustrating an operation of burner combustion control according to the first embodiment.

FIG. 3 is a schematic configuration diagram showing another embodiment of the above.

FIG. 4 is a schematic configuration diagram showing another embodiment of the above.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... New material dryer 3 ... New material burner 14 ... Waste material dryer 16 ... Waste material burner 22 ... Exhaust flue 24 ... Exhaust gas 29 ... Inverter 30 ... Gas temperature sensor 31 ... Aggregate temperature sensor 32 ... Burner combustion control device 33 ... exhaust gas calorie calculation means 34 ... combustion amount control means 38 ... differential pressure gauge 39 ... flow meter

Claims (4)

[Claims] (1) A new material dryer for heating new material and a waste material dryer for heating waste material are provided side by side, and an exhaust flue of the waste material dryer is connected to a burner side of the new material dryer to reduce exhaust gas from the waste material dryer. The asphalt mixture production equipment to be introduced into the material dryer has a gas amount detection means for detecting the amount of exhaust gas from the waste material dryer and a gas temperature sensor for detecting the temperature of the exhaust gas, and possesses the exhaust gas based on the detected gas amount and the gas temperature. An asphalt mixture production apparatus, comprising: an exhaust gas calorie calculating means for calculating a calorific value to be heated; and a combustion amount control means for increasing or decreasing a burner combustion amount of a new material dryer based on an output value of the exhaust gas calorie calculating means. 2. An exhaust fan disposed in an exhaust flue of a waste material dryer is provided with an inverter for controlling air volume, and an exhaust gas amount is obtained from frequency data of the inverter as gas amount detecting means. Asphalt mix production equipment. 3. A differential pressure sensor for detecting a differential pressure in an exhaust flue disposed between an upstream side and a downstream side of an exhaust fan disposed in an exhaust flue of a waste material dryer as gas amount detecting means. 2. The asphalt mixture manufacturing apparatus according to claim 1, wherein the amount of exhaust gas is determined from the pressure. 4. An asphalt mixture production apparatus according to claim 1, wherein a flow meter is provided in an exhaust flue of the waste material dryer as a gas amount detecting means.