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Method for drying rock asphalt powder under superhigh temperature and negative pressure

A technology of negative pressure drying and rock asphalt, applied in the field of drying rock asphalt powder and ultra-high temperature negative pressure drying rock asphalt powder, can solve the problems of low drying efficiency of rock asphalt powder, etc., to reduce potential safety hazards and damage to equipment, guarantee Quality and efficiency, fast drying results

Active Publication Date: 2017-09-08
北京市首发高速公路建设管理有限责任公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of low drying efficiency of the existing rock asphalt powder, the present invention adopts an ultra-high temperature negative pressure drying method to dry the rock asphalt powder, which greatly improves the drying efficiency of the rock asphalt powder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for drying rock asphalt powder with ultra-high temperature and negative pressure includes the following steps:

[0030] S1: The hot air flow generated by the combustion heater is sent to the dryer through the blower (the volume is 45m 3 ), preheat the dryer, where the preheat temperature is 360℃, and the preheat time is 5min;

[0031] S2: Continue to enter the high-temperature hot air flow. When the dryer body and the air temperature in the dryer reach 370°C, add rock asphalt powder with a water content of 15% into the dryer, and the addition amount is 18 tons / hour. The temperature is maintained at 370-420℃; the water vapor and part of the rock asphalt dust generated during the drying process are led to the dust removal condenser by the induced draft fan, and the air volume of the induced draft fan is 3500m 3 / h, so that the dryer is always in a negative pressure state during the drying process, and the condensed water and some rock asphalt dust are discharged from t...

Embodiment 2

[0034] A method for drying rock asphalt powder with ultra-high temperature and negative pressure includes the following steps:

[0035] S1: The hot air flow generated by the combustion heater is sent to the dryer through the blower (the volume is 45m 3 ), preheat the dryer, where the preheat temperature is 360℃, and the preheat time is 5min;

[0036] S2: Continue to pass in the ultra-high temperature hot air flow. When the dryer body and the air temperature in the dryer reach 380°C, add rock asphalt powder with a water content of 20% into the dryer, the adding amount is 16 tons / hour, and the drying temperature Keep it at 380-420℃; the water vapor and some rock asphalt dust generated during the drying process are led out to the dust removal condenser by the induced draft fan, and the air volume of the induced draft fan is 3800m 3 / h, so that the dryer is always in a negative pressure state during the drying process, and the condensed water and some rock asphalt dust are discharged fr...

Embodiment 3

[0039] A method for drying rock asphalt powder with ultra-high temperature and negative pressure includes the following steps:

[0040] S1: The hot air flow generated by the combustion heater is sent to the dryer through the blower (the volume is 45m 3 ), preheat the dryer, where the preheat temperature is 360℃, and the preheat time is 5min;

[0041] S2: Continue to enter the high-temperature hot air flow. When the dryer body and the air temperature in the dryer reach 400°C, add rock asphalt powder with a water content of 25% into the dryer, the adding amount is 14 tons / hour, and the drying temperature is maintained At 400-420℃; the water vapor and some rock asphalt dust generated during the drying process are led to the dust removal condenser by the induced draft fan, and the air volume of the induced draft fan is 4200m 3 / h, so that the dryer is always in a negative pressure state during the drying process, and the condensed water and some rock asphalt dust are discharged from the...

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PUM

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Abstract

The invention relates to a method for drying rock asphalt powder under superhigh temperature and negative pressure. A superhigh temperature hot air flow is adopted to rapidly dry the rock asphalt powder in a dryer; and stream and part of rock asphalt dust which are generated in the drying process is led out by an induced draught fan, the dryer is made to be in a negative pressure state in the drying process all the time. The superhigh temperature hot air flow is adopted to dry the rock asphalt powder, the phenomena of melting, caking and adhering of the rock asphalt powder at the time of drying can be avoided, and the drying quality and efficiency are guaranteed. Meanwhile, the steam in the dryer is led out by the induced draught fan, the dryer is made to be in the negative pressure state, so that on the one hand, safety hazards and damage to equipment are reduced, and on the other hand, the dryer is under the negative pressure to enable the drying speed of materials to be higher.

Description

Technical field [0001] The invention belongs to the field of rock asphalt processing, and relates to a method for drying rock asphalt powder, in particular to a method for drying rock asphalt powder with ultra-high temperature and negative pressure. Background technique [0002] Rock asphalt powder is a natural asphalt modifier, which is processed from natural rock asphalt minerals and used to modify the asphalt mixture in road construction. The asphalt modified by rock asphalt powder has superior road performance. Compared with traditional modifiers, the road’s resistance to rutting, water damage, cracks, potholes, and crowding is greatly improved. Domestic and foreign experimental research and engineering practice have received more and more attention and have broad prospects for promotion and application. However, the processing equipment and technology of rock asphalt powder are relatively backward, which restricts its large-scale application in road construction. [0003] Be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F26B11/02F26B21/10F26B21/00F26B25/00
CPCF26B11/02F26B21/00F26B21/10F26B25/00
Inventor 龚城王世友
Owner 北京市首发高速公路建设管理有限责任公司