CN107144106B - Method for drying rock asphalt powder at ultrahigh temperature and negative pressure - Google Patents
Method for drying rock asphalt powder at ultrahigh temperature and negative pressure Download PDFInfo
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- CN107144106B CN107144106B CN201710266117.8A CN201710266117A CN107144106B CN 107144106 B CN107144106 B CN 107144106B CN 201710266117 A CN201710266117 A CN 201710266117A CN 107144106 B CN107144106 B CN 107144106B
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- 239000010426 asphalt Substances 0.000 title claims abstract description 120
- 239000011435 rock Substances 0.000 title claims abstract description 120
- 238000001035 drying Methods 0.000 title claims abstract description 118
- 239000000843 powder Substances 0.000 title claims abstract description 95
- 238000000034 method Methods 0.000 title claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 47
- 239000000428 dust Substances 0.000 claims abstract description 38
- 238000007599 discharging Methods 0.000 claims description 27
- 238000009833 condensation Methods 0.000 claims description 2
- 230000005494 condensation Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 26
- 230000008018 melting Effects 0.000 abstract description 3
- 238000002844 melting Methods 0.000 abstract description 3
- 238000002485 combustion reaction Methods 0.000 description 9
- 238000001704 evaporation Methods 0.000 description 6
- 230000008020 evaporation Effects 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 239000003607 modifier Substances 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B11/00—Machines or apparatus for drying solid materials or objects with movement which is non-progressive
- F26B11/02—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/10—Temperature; Pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention relates to a method for drying rock asphalt powder at ultrahigh temperature and negative pressure, which adopts ultrahigh temperature hot air flow to quickly dry the rock asphalt powder in a dryer, and leads water vapor and partial rock asphalt dust generated in the drying process out by an induced draft fan so that the dryer is always in the negative pressure state in the drying process. The method adopts ultrahigh-temperature hot air flow to dry the rock asphalt powder, can avoid the phenomena of melting, caking and adhesion of the rock asphalt powder during drying, and ensures the drying quality and efficiency. Meanwhile, the induced draft fan is adopted to lead out the vapor in the dryer, so that the dryer is in a negative pressure state, on one hand, the potential safety hazard is reduced, the damage to equipment is reduced, and on the other hand, the dryer is in a negative pressure state, so that the drying speed of the material is higher.
Description
Technical Field
The invention belongs to the field of rock asphalt processing, relates to a method for drying rock asphalt powder, and particularly relates to a method for drying rock asphalt powder under ultrahigh temperature and negative pressure.
Background
The rock asphalt powder is a natural asphalt modifier, is processed by natural rock asphalt mineral aggregate and is used for modifying asphalt mixed raw materials in road construction. The asphalt modified by the rock asphalt powder has more excellent road performance, compared with the traditional modifier, the asphalt greatly improves the resistance of roads to ruts, water damage, cracks, pits and bags, and is more and more emphasized through test research and engineering practice at home and abroad for many years, thereby having wide popularization and application prospects. However, the processing equipment and process of the rock asphalt powder are relatively backward, and the large-scale application of the rock asphalt powder in road construction is restricted.
Before the rock asphalt powder is used as a modifier, the rock asphalt powder needs to be dried, at present, the drying process of the rock asphalt powder still adopts a convection drying mode, heat energy from a combustion device is conducted to the surface of a wet material in a convection mode through hot gas, and the heat energy is conducted to the interior of the material through the surface of the material, so that the moisture of the material is fully evaporated. Compared with the common ore raw materials, the rock asphalt ore has unstable water content, high oil content and sensitivity to heat, is easy to soften and agglomerate when heated in the drying process, is easy to ignite and burn when not operated properly, and can also cause the aging of the rock asphalt. Therefore, in the process of drying the rock asphalt powder, a low-temperature normal-pressure drying method is generally adopted at home, and the temperature is generally lower than 200 DEG CThe pressure in the cylinder was substantially the same as ambient pressure and the drying efficiency was about 75 kg/h. According to the formula G ═ AV/100 × [ (W)1-W2)/(100-W1)](G is the capacity of the rotary dryer in tons/hour, based on the dry material containing the final moisture content, and A is the evaporation intensity per unit volume of the rotary dryer in kg/m3(ii) a V is the volume of the rotary dryer, and the unit is m3；W1The initial moisture content; w2Final moisture) of only about 5 tons of wet material with 15% moisture content can be dried per hour.
Disclosure of Invention
In order to solve the problem of low drying efficiency of the existing rock asphalt powder, the invention adopts an ultrahigh-temperature negative-pressure drying method to dry the rock asphalt powder, thereby greatly improving the drying efficiency of the rock asphalt powder.
The technical scheme adopted by the invention is as follows:
the method for drying the rock asphalt powder at the ultrahigh temperature and the negative pressure adopts ultrahigh temperature hot air flow to quickly dry the rock asphalt powder in a dryer, and water vapor and partial rock asphalt dust generated in the drying process are led out by an induced draft fan, so that the dryer is always in the negative pressure state in the drying process.
Further, the drying temperature is 370-.
Further, during the drying process, the pressure in the dryer is 0.6-0.8 atm.
Further, the dried rock asphalt powder is discharged from a discharge opening of the dryer and collected, and the time from feeding to discharging of the rock asphalt powder is 25-30 s.
Furthermore, before drying, hot air flow is introduced into the dryer, and the dryer is subjected to preheating treatment.
Further, the preheating temperature is 300-; the preheating temperature refers to the temperature of hot air flow during preheating.
Further, after preheating treatment, hot air flow is continuously introduced into the dryer, and after the temperature of the dryer body and the air in the dryer reaches the drying initial temperature, rock asphalt powder is added into the dryer.
Further, the drying temperature is 370-390 ℃, and the drying temperature is not less than the drying temperature.
Furthermore, vapor and partial rock asphalt dust are led out to a dust removal condenser by an induced draft fan for dust removal condensation, condensed water is discharged from a discharging valve of the dust removal condenser, partial rock asphalt dust is left on a filter screen at the discharging valve of the dust removal condenser, and the condensed water and the partial rock asphalt dust are returned to the dryer for drying after being recovered.
Further, the hot air stream is delivered into the dryer by a blower.
Compared with the traditional rock asphalt powder drying method, the method has the following beneficial effects: according to the invention, the rock asphalt powder is dried by adopting an ultrahigh-temperature negative-pressure method, and most of water in the rock asphalt powder can be evaporated by utilizing the contact of ultrahigh-temperature hot air and the rock asphalt powder in a short time, so that the phenomena of melting, caking and adhesion of the rock asphalt powder during drying are avoided, and the drying quality and efficiency are ensured. Meanwhile, the induced draft fan is adopted to lead out the vapor in the dryer, so that the dryer is always in a negative pressure state in the drying process, on one hand, the potential safety hazard caused by the fact that the pressure in the dryer rises due to instantaneous evaporation of water is reduced, and the damage to equipment is reduced, and on the other hand, the dryer is in a negative pressure state, so that the drying speed of the material is higher.
Detailed Description
The following will explain the embodiments of the present invention in detail with reference to examples, which are provided for illustration only and are not intended to limit the scope of the present invention.
The method for drying the rock asphalt powder at the ultrahigh temperature and the negative pressure adopts ultrahigh temperature hot air flow to quickly dry the rock asphalt powder in a dryer, and water vapor and partial rock asphalt dust generated in the drying process are led out by an induced draft fan, so that the dryer is always in the negative pressure state in the drying process. Specifically, because the rock asphalt powder has unstable water content, high oil content, sensitivity to heat and easiness in ignition and combustion due to improper operation, the traditional drying method usually adopts low-temperature normal-pressure drying, the temperature is generally lower than 200 ℃, the pressure is 1 atmospheric pressure, and the water evaporation is slow under the condition. Because the rock asphalt powder belongs to amorphous bodies and has no fixed melting point, the rock asphalt powder can be gradually melted and softened and agglomerated along with time in the drying process, and even can be adhered to the inner wall of a dryer, so that the effective components in the rock asphalt powder can be aged, and the service performance is reduced. Therefore, the invention leads the ultrahigh-temperature airflow into the dryer, can accelerate the drying speed of the rock asphalt powder, and ensures that most of water in the airflow is evaporated after the airflow is contacted with the rock asphalt powder for a short time before the rock asphalt powder is softened and agglomerated, thereby ensuring the drying quality and efficiency. However, the side effect brought by the instant evaporation of the moisture under the ultrahigh temperature airflow is that the air pressure in the dryer rises rapidly and is higher than 1 atmosphere, the rising of the air pressure increases the probability of equipment damage and brings potential safety hazards, and meanwhile, the rising of the air pressure is not beneficial to further evaporation of the moisture in the rock asphalt powder, so that the draught fan is communicated with the air outlet of the dryer, the water vapor in the dryer is led out by adopting proper air quantity, the air pressure in the dryer is reduced to a negative pressure state, and a series of problems brought by the rising of the air pressure are overcome. The drying method of the invention is used for drying the rock asphalt powder, the rock asphalt powder is continuously added from the feeding hole and discharged from the discharging hole, and the drying process is continuous drying.
In an embodiment according to the invention, the drying temperature is 370-420 deg.C, for example the drying temperature is 370 deg.C, 380 deg.C, 390 deg.C, 400 deg.C, 410 deg.C or 420 deg.C, preferably 420 deg.C. Specifically, the drying temperature adopted by the method is improved by about one time compared with the traditional method, so that the drying time is greatly shortened when the material quantity is constant, or the feeding quantity is greatly increased when the drying time is constant.
In one embodiment according to the invention, the pressure in the dryer during drying is 0.6-0.8 atm, for example the dryer pressure is 0.6, 0.7 or 0.8 atm. Specifically, the water vapor in the dryer is led out by the induced draft fan, so that the dryer is always in a negative pressure state, in the embodiment, the pressure in the dryer is preferably 0.8 atmospheric pressure, at the moment, the induced draft amount does not need to be too large, the energy consumption of equipment is low, and meanwhile, the dryer can be prevented from being damaged by high pressure and the drying efficiency is high.
In one embodiment according to the invention, the dried rock asphalt powder is discharged and collected from the discharge opening of the dryer, said rock asphalt powder having a time from feeding to discharging of 25-30s, for example a time of 25s, 27s, 28s or 30 s. Particularly, the method adopts the ultrahigh-temperature air flow and performs drying on the rock asphalt powder under the negative pressure, so that the drying speed of the rock asphalt powder is greatly accelerated. Specifically, when the pressure in the dryer is set to 0.8 atm, and the volume of the dryer and the amount of the material to be dried are the same as those of the conventional method using the conventional single-cylinder rotary dryer, the time from the entry of the material into the dryer to the exit of the dryer is about 25 to 30 seconds for the ordinary rock asphalt powder having a water content (15 to 25%). If conventional drying methods are used, the drying time may be extended to about 3.6 times that of the present invention when the feed rate is consistent with the present invention and the same output moisture level as the present invention is achieved. Generally, however, the rock asphalt powder will agglomerate in the dryer over a drying time of 90 seconds, so the amount of material is generally reduced in order to avoid agglomeration. In a word, the invention can greatly reduce the drying time or increase the feeding amount, improve the drying efficiency and simultaneously reduce the phenomena of softening, caking and aging of the rock asphalt powder.
In one embodiment according to the present invention, before drying, hot air is introduced into the dryer, and the dryer is preheated at a temperature of 300-; the preheating time is 1-10min, such as 1min, 3min, 5min, 7min, 8min or 10min, preferably 5 min. Specifically, the dryer is preheated before the rock asphalt powder is dried, so that the air temperature in the dryer body and the dryer can quickly reach the temperature during drying, and the drying time of the rock asphalt powder is shortened.
In one embodiment of the invention, after the preheating treatment, hot air flow is continuously introduced into the dryer, and after the temperature of the dryer body and the air in the dryer reaches the drying initial temperature, rock asphalt powder is added into the dryer; the initial temperature of the drying is 370-390 ℃, for example, the temperature is 370 ℃, 380 ℃ or 390 ℃, and the drying temperature is not less than the initial temperature of the drying. Specifically, after the preheating treatment, high-temperature hot air flow is continuously introduced, and when the air temperature in the dryer body and the dryer reaches 370-390 ℃, the rock asphalt powder is added into the dryer. Since the hot air flow is continuously introduced into the dryer during the drying process, the drying temperature is greater than or equal to the initial drying temperature, in this embodiment, the initial drying temperature is preferably 370 ℃, and the drying temperature is preferably 420 ℃. At the drying temperature of the invention, the moisture can be quickly evaporated, and the drying efficiency of the rock asphalt powder is improved, namely, if the time from feeding to discharging is certain, the amount of the material (rock asphalt powder) dried in a certain time by adopting the method of the invention is large, or when the amount of the dried material is certain, the drying time is shorter by adopting the method of the invention. In this embodiment, the preheated and dried ultrahigh-temperature hot air flow is generated by a combustion heater, and the hot air flow in the combustion heater is conveyed into a dryer by a blower, wherein the dryer is a single-cylinder rotary dryer in the embodiment of the invention.
In one embodiment of the invention, the water vapor and part of the rock asphalt dust are led out to the dedusting condenser by the induced draft fan for dedusting and condensing, the condensed water is discharged from a discharging valve of the dedusting condenser, and part of the rock asphalt dust is left on a filter screen at the discharging valve of the dedusting condenser and is recycled and then returned to the dryer for drying. Specifically, the draught fan not only can take away the vapor in the desicator, and in partial rock pitch dust was also taken out dust removal condenser, dust removal condenser's unloading valve department installed the filter screen, and the filter screen is with rock pitch dust and condensate separation, and the comdenstion water flows from dust removal condenser's unloading valve department, and rock pitch dust stays on the filter screen, clears up the filter screen at intervals, gets into the desicator after retrieving rock pitch dust again in the desiccator. The air quantity of the induced draft fan is related to the hot air flow, the material quantity, the material water content, the volume of the dryer, the pressure of the dryer and the time from feeding to discharging, and the air quantity of the induced draft fan can be determined because the parameters can be calculated.
To is coming toThe side effects caused by the instantaneous evaporation of water will be explained in more detail below with specific data. Assuming that 18 tons of material can be dried per hour by using the drying method of the present invention, the water content of the material is 15%, the time from feeding to discharging is 30s, and the volume of the dryer is 45m3When the pressure in the dryer was 1 atm, it was found by calculation that the material in the dryer was 18 × 1000kg/3600s × 30s ═ 150kg, the water content in the material was 150kg × 15%: 22.5kg, and the volume of the material after complete conversion of the water into steam was 22.5 × 1000/18 × 22.4 ═ 28m3(18 being the molar mass of water and 22.4 being the volume of 1mol of gas in the standard case), since the volume of the dryer is 45m3The ideal gas equation of state can show that the pressure in the dryer will rise to 1.62 atmospheres (the pressure of our domestic pressure cooker is 1.2 atmospheres generally), and such high pressure is easy to cause equipment damage and has potential safety hazard.
In order to reduce the potential safety hazard, the invention adopts the induced draft fan to evaporate water to generate 28m in 30s3When the water vapor is discharged, the induced draft needs at least 28m3/30s×3600s/h＝3360m3H is used as the reference value. In order to further improve the drying efficiency and increase the safety factor, the drying cylinder can be always in a negative pressure state in continuous production, high-temperature air saturated with water vapor is quickly discharged, experiments prove that the air pressure in the dryer can meet the requirement when being 0.8 atmospheric pressure, and the calculated induced air volume is 3360/0.8-4200 m3/h。
The following description is given by way of specific examples.
Example 1
A method for drying rock asphalt powder at ultrahigh temperature and negative pressure comprises the following steps:
s1: the hot air flow generated by the combustion heater is conveyed to the dryer (with the volume of 45 m) by the blower3) Preheating a dryer, wherein the preheating temperature is 360 ℃ and the preheating time is 5 min;
s2: continuously introducing high-temperature hot air, adding rock asphalt powder with water content of 15% into the dryer when the temperature of the dryer body and the air in the dryer reaches 370 ℃,the adding amount is 18 tons/hour, and the temperature in the dryer is kept at 370 ℃ and 420 ℃; the water vapor and part of rock asphalt dust generated in the drying process are led out to a dust removal condenser by an induced draft fan, and the air volume of the induced draft fan is 3500m3Enabling the dryer to be in a negative pressure state all the time in the drying process, and discharging condensed water and part of rock asphalt dust from a discharging valve of the dust removal condenser;
s3: and discharging and collecting the dried rock asphalt powder from a discharge opening of the dryer, wherein the time from feeding to discharging of the rock asphalt powder is 25 s.
Example 2
A method for drying rock asphalt powder at ultrahigh temperature and negative pressure comprises the following steps:
s1: the hot air flow generated by the combustion heater is conveyed to the dryer (with the volume of 45 m) by the blower3) Preheating a dryer, wherein the preheating temperature is 360 ℃ and the preheating time is 5 min;
s2: continuously introducing ultrahigh-temperature hot air, and adding rock asphalt powder with the water content of 20% into the dryer when the temperature of the dryer body and the air in the dryer reaches 380 ℃, wherein the adding amount is 16 tons/hour, and the drying temperature is kept at 380-; the water vapor and part of rock asphalt dust generated in the drying process are led out to a dust removal condenser by an induced draft fan, and the air volume of the induced draft fan is 3800m3Enabling the dryer to be in a negative pressure state all the time in the drying process, and discharging condensed water and part of rock asphalt dust from a discharging valve of the dust removal condenser;
s3: and discharging and collecting the dried rock asphalt powder from a discharge opening of the dryer, wherein the time from feeding to discharging of the rock asphalt powder is 30 s.
Example 3
A method for drying rock asphalt powder at ultrahigh temperature and negative pressure comprises the following steps:
s1: the hot air flow generated by the combustion heater is conveyed to the dryer (with the volume of 45 m) by the blower3) Preheating a dryer, wherein the preheating temperature is 360 ℃ and the preheating time is 5 min;
s2: continuously introducing high-temperature hot air, and dryingAfter the air temperature in the dryer reaches 400 ℃, adding rock asphalt powder with the water content of 25 percent into the dryer, wherein the adding amount is 14 tons/hour, and the drying temperature is kept at 420 ℃ of 400-; the water vapor and part of rock asphalt dust generated in the drying process are led out to a dust removal condenser by an induced draft fan, and the air volume of the induced draft fan is 4200m3Enabling the dryer to be in a negative pressure state all the time in the drying process, and discharging condensed water and part of rock asphalt dust from a discharging valve of the dust removal condenser;
s3: and discharging and collecting the dried rock asphalt powder from a discharge opening of the dryer, wherein the time from feeding to discharging of the rock asphalt powder is 30 s.
After the rock asphalt powder of the embodiments 1 to 3 is dried, the water content of the material discharged from the discharge opening of the dryer is reduced to below 2%, and the rock asphalt powder is not melted, agglomerated and aged in the drying process.
Comparative example 1
A method of drying rock asphalt powder comprising the steps of:
s1: the hot air flow generated by the combustion heater is conveyed to the dryer (with the volume of 45 m) by the blower3) Preheating a dryer, wherein the preheating temperature is 150 ℃, and the preheating time is 10 min;
s2: continuously introducing high-temperature hot air, and adding the rock asphalt powder with the water content of 15% into the dryer when the temperature of the dryer body and the air in the dryer reaches 160 ℃, wherein the adding amount is 18 tons/h, the drying temperature is kept at 160-180 ℃, and the pressure is 1 atmosphere;
s3: and discharging and collecting the dried rock asphalt powder from a discharge opening of the dryer, wherein the time from feeding to discharging of the rock asphalt powder is 30 s.
Comparative example 2
A method of drying rock asphalt powder comprising the steps of:
s1: the hot air flow generated by the combustion heater is conveyed to the dryer (with the volume of 45 m) by the blower3) Preheating a dryer, wherein the preheating temperature is 150 ℃, and the preheating time is 10 min;
s2: continuously introducing high-temperature hot air, and after the temperature of the dryer body and the air in the dryer reaches 160 ℃, adding the rock asphalt powder with the water content of 15 percent into the dryer, wherein the adding amount is 5 tons/hour, the drying temperature is kept at 160-class air temperature and 180 ℃, and the pressure is 1 atmospheric pressure;
s3: and discharging and collecting the dried rock asphalt powder from a discharge opening of the dryer, wherein the time from feeding to discharging of the rock asphalt powder is 30 s.
In comparative example 1, the amount of the added material and the water content of the rock asphalt powder were the same as those in example 1, and after drying, the water content of the obtained rock asphalt powder was 6%, and only rock asphalt powder having a water content of 2% or less was satisfactory.
In comparative example 2, the water content of the added rock asphalt powder is the same as that of example 1, but the material amount is different from that of example 1, the material amount of example 1 is 18 tons/hour, the material amount of comparative example 2 is 5 tons/hour, and after drying, the water content of the obtained rock asphalt powder is similar to that of example 1 (less than 2%), namely, the required rock asphalt powder is obtained, and the feeding amount needs to be reduced.
Therefore, the drying efficiency is greatly improved by adopting the ultrahigh-temperature negative-pressure method to dry the rock asphalt powder.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. The method for drying the rock asphalt powder at the ultrahigh temperature and the negative pressure is characterized in that the rock asphalt powder in a dryer is quickly dried by ultrahigh-temperature hot air, water vapor and part of rock asphalt dust generated in the drying process are led out by an induced draft fan, so that the dryer is always in the negative pressure state in the drying process, the drying temperature is 370 plus-420 ℃, the drying temperature refers to the temperature of the ultrahigh-temperature hot air, and the pressure in the dryer is 0.6-0.8 atm in the drying process.
2. The ultrahigh-temperature negative pressure rock asphalt powder drying method according to claim 1, wherein the dried rock asphalt powder is discharged and collected from a discharge port of the dryer, and the time from feeding to discharging of the rock asphalt powder is 25-30 s.
3. The ultrahigh-temperature negative-pressure rock asphalt powder drying method according to claim 1, wherein before drying, hot air flow is introduced into the dryer, and the dryer is subjected to preheating treatment.
4. The method for drying the asphalt powder of the rock under the ultrahigh-temperature and negative-pressure conditions as recited in claim 3, wherein the preheating temperature is 300-370 ℃ and the preheating time is 1-10 min.
5. The method for drying the rock asphalt powder at the ultrahigh-temperature negative pressure as claimed in claim 4, wherein after the preheating treatment, hot air flow is continuously introduced into the dryer, and after the temperature of the dryer body and the air in the dryer reaches the drying initial temperature, the rock asphalt powder is added into the dryer.
6. The ultrahigh-temperature negative-pressure rock asphalt powder drying method according to claim 5, wherein the drying temperature is 370 ℃ and 390 ℃ at the initial temperature, and the drying temperature is not less than the drying temperature at the initial temperature.
7. The method for drying the rock asphalt powder at the ultrahigh-temperature negative pressure as claimed in claim 1, wherein the water vapor and part of the rock asphalt dust are led out to a dust removal condenser by an induced draft fan for dust removal and condensation, the condensed water is discharged from a discharge valve of the dust removal condenser, and part of the rock asphalt dust is left on a filter screen at the discharge valve of the dust removal condenser and is returned to the dryer for drying after being recovered.
8. The ultrahigh-temperature negative-pressure rock asphalt powder drying method according to any one of claims 1 to 7, characterized in that hot air flow is conveyed into the dryer by a blower.
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| JP5265308B2 (en) * | 2008-11-04 | 2013-08-14 | 篤 平川 | Crushing and drying equipment |
| CN201476541U (en) * | 2009-09-10 | 2010-05-19 | 沈阳铝镁设计研究院 | System for two-stage petroleum coke calcination of rotary kiln |
| CN201748770U (en) * | 2010-08-09 | 2011-02-16 | 泰安立人选煤工程有限公司 | Brown coal drying and quality-improving system |
| CN203501695U (en) * | 2013-10-10 | 2014-03-26 | 中国石油化工股份有限公司 | Drying equipment of epoxy resin waste polymers |
| CN104047219B (en) * | 2014-06-20 | 2016-04-13 | 玉门油田科达化学有限责任公司 | A kind of sulfonated gilsonite produces drying unit |
| CN204301464U (en) * | 2014-09-25 | 2015-04-29 | 南通天泽化工有限公司 | Sodium acetate drying equipment |
| CN105841478B (en) * | 2015-02-12 | 2018-01-23 | 内蒙古科技大学 | Self-sealed low-order coal negative pressure drying device |
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| CN107144106A (en) | 2017-09-08 |
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