Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B28—WORKING CEMENT, CLAY, OR STONE
  • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
  • B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
  • B28C5/46—Arrangements for applying super- or sub-atmospheric pressure during mixing; Arrangements for cooling or heating during mixing, e.g. by introducing vapour
  • B28C5/466—Heating, e.g. using steam
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B28—WORKING CEMENT, CLAY, OR STONE
  • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
  • B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
  • B28C7/0007—Pretreatment of the ingredients, e.g. by heating, sorting, grading, drying, disintegrating; Preventing generation of dust
  • B28C7/0023—Pretreatment of the ingredients, e.g. by heating, sorting, grading, drying, disintegrating; Preventing generation of dust by heating or cooling
  • B28C7/003—Heating, e.g. using steam
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L95/00—Compositions of bituminous materials, e.g. asphalt, tar, pitch
• • E—FIXED CONSTRUCTIONS
  • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
  • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
  • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
  • E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
  • E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
  • E01C19/1059—Controlling the operations; Devices solely for supplying or proportioning the ingredients
  • E01C19/1063—Controlling the operations

Definitions

• the present invention relates to an apparatus for manufacturing ASCON, and more particularly to an apparatus provided with an additional heat exchange part where a regenerative material is used to maintain the asphalt in the fluid state during discontinuance of an apparatus, and to reduce energy consumption when it is operated again.
• ASCON stands for asphalt concrete and is known to other names such as asphalt, asphalt mixture, asphalt concrete, hot mixture and HMA (hot mix asphalt).
• a typical ASCON is a mixture of asphalt, rocks, gravels, and filler for pavement prepared at room temperature or heating condition, mainly used for road pavement and parking area, and it is differentiated depending on purpose of application, use, function and construction method.
• Fig. 1 shows an illustrative view of ASCON manufacturing apparatus.
• Apparatus for manufacturing ASCON (1) is composed of the asphalt reservoir (10), the feeder part of the pavement material (20), the weighing part (30) and the mixing part (40).
• the asphalt reservoir (10) stores the asphalt in the fluid state and supplies to the weighing part (30).
• the feeder part of the pavement material (20) supplies materials such as lime powder, gravels, lime mixture and sand to the weighing part (30).
• the asphalt and the pavement materials provided are weighed in the desired ratio, and then transferred to the mixing part (40). Then, the asphalt and the pavement material provided from the weighing part are mixed in the mixing part (40) to prepare ACSON.
• the heating part (60) such as a gasoline burner or an electric heater and circulates for indirect heating by the pump.
• temperature of the hot oil medium is increased in the range of 150-160 0 C, and then the hot oil medium circulates to maintain temperature of the asphalt in the reservoir, the weighing apparatus and the mixing apparatus at 140-150 0 C.
• the inventor of the present invention investigated the physical properties of the asphalt to solve the problems of ASCON manufacturing apparatus as described above.
• As the general physical properties of the asphalt is determined it forms a solid at room temperature, then turns to a fluid at softening temperature, approximately 85-100 0 C, and the specific heat is approximately 0.40 kcal/kg°C at 0-100 0 C, 0.45 kcal/kg°C at 100-200 0 C, 0.50 kcal/kg°C at over 200 0 C, meanwhile the latent heat to get phase transfer from the solid to the fluid is 35 kcal/kg.
• the heat capacity required to increase temperature of the asphalt from room temperature, 2O 0 C to 145 0 C is shown briefly in the folio wings; the heat capacity to increase temperature from 2O 0 C to 100 0 C is required 32 kcal/kg, the heat capacity to get phase transfer at the same temperature is required the additional 67 kcal/kg, the heat capacity to be able to eject the asphalt, where it is softened at 100 0 C, is required 20 kcal/kg, and overall 120 kcal/kg of the heat capacity is required.
• FIG. 1 is a general view showing the structure of the conventional ASCON manufacturing apparatus.
• FIG. 2 is an illustrative view of the present invention showing the structure of
• FIG. 3 is an illustrative cross-sectional view showing the structure of the heat exchange part in accordance with one embodiment of of the present invention.
• FIG. 4 is an illustrative trans-sectional view showing the structure of the heat exchange part in accordance with one embodiment of of the present invention.
• FIG. 5 is another illustrative view showing the structure of ASCON manufacturing apparatus in accordance with another embodiment of of the present invention. Best Mode for Carrying Out the Invention
• the present invention in the ASCON manufacturing apparatus that produces ASCON by mixing the asphalt and the pavement materials provides ASCON manufacturing apparatus comprising the following; the asphalt reservoir which stores and supplies the asphalt; the feeder part of the pavement materials which supplies the pavement materials; the weighing part which supplies the asphalt and the pavement materials in the desired ratio; the mixing part which mixes the asphalt and the pavement materials received; the circulation line of the hot oil medium which circulates the asphalt reservoir, the weighing part and the mixing part to prevent solidification of the asphalt; the heating part, which is installed on the circulation line, to heat the hot oil medium when it circulates the line; the heat exchange part, which installed on the circulation line, to store during operation of the apparatus and radiate heat to the asphalt during discontinuance of the apparatus.
• the apparatus comprises the asphalt reservoir which stores and supplies the asphalt; the feeder part of the pavement materials which supplies the pavement materials; the weighing part which supplies the asphalt and the pavement materials in the desired ratio; the mixing part which mixes the asphalt and the pavement materials received; the circulation line of the hot oil medium which circulates the asphalt reservoir, the weighing part and the mixing part to prevent solidification of the asphalt; the heating part, which is installed on the circulation line, to heat the hot oil medium when it circulates the line, in addition, it provides ASCON manufacturing apparatus representing the distinctive heat exchange arrangement that the heating part stores the heat during operation of the apparatus and radiates to heat the asphalt during discontinuance of the apparatus.
• Fig. 2 is a general view of the ASCON manufacturing apparatus (100) in accordance with one embodiment of the present invention.
• ASCON manufacturing apparatus is, as shown in Fig. 2, comprises the asphalt reservoir (110), the feeder part of the pavement materials (120), the weighing part (130), the mixing part (140), the circulation line of hot oil medium (150), the heating part (160), the circulation pump (170) and the heat exchange part (180).
• the asphalt reservoir (110), the feeder part of the pavement materials (120), the weighing part (130), the mixing part (140), the circulation line of hot oil medium (150), the heating part (160) and the circulating pump (170) are similar to the conventional apparatus, we do not explain repeatedly.
• the heat exchange part (180) is installed by connection to the part of circulation line of hot oil medium (150). Precisely, it is installed on the circulation line of hot oil medium (150), and then receives and stores heat during operation of the apparatus (100), and radiates to heat the asphalt to prevent solidification during discontinuance of the apparatus (100). At this time, as shown in Fig. 2, it is recommended to install the supplementary circulation line of hot oil medium (190) through the circulation line (150), which connects the input (151) and the output (152) of the asphalt reservoir.
• the circulation line is changed during pre-heat period for the sake of minimum heat loss where the hot oil medium does not pass through the weighing part (130) and the mixing part (140) but pass through the supplementary circulation line (190) of hot oil medium. Therefore, according to the present embodiment, the circulation line of hot oil medium (150) which is located at the bottom of the supplementary circulation line of hot oil medium (190) is installed the valves (153, 154), and it is recommended to close these valves (153, 154) to induce circulation of hot oil medium through the supplementary circulation line (190). In addition, the valves (191, 192) are installed at the both ends of the supplementary circulation line (190), and it is recommended to keep the hot oil medium not pass through the supplementary line (190) while the main heating process is undergoing.
• Figs. 3 and 4 are general views that explain the heat exchange part (180).
• the heat exchange part (180) according to the present embodiment, as shown in Fig. 3, comprises the regenerative band (181), the pipe line of hot oil medium (182) and the external container (180).
• the regenerative band (181) is a composition factor where the latent-regenerative material is filled.
• the latent-regenerative material that is filled in the regenerative band (181) is supposed to receive heat from the high temperature oil medium where it circulates during operation of ASCON manufacturing apparatus, and it radiates to heat the oil medium during discontinuance of the apparatus.
• the latent-regenerative material used in the present embodiment regenerates accompanied by phase transfer at 100-11O 0 C, and it is recommended that the material should radiate desired temperature of heat during phase transfer.
• This latent-regenerative material is a slurry material formed by mixing an oxide and water in the 1 : 1 ratio.
• the oxide described above is composed of silicon dioxide 74-84 volume %, aluminum oxide 7.6-15.6 volume %, calcium oxide 1.0-2.2 %, magnesium oxide 1.0-2.2 volume %, potassium oxide 1.0-2.2 volume %, sodium oxide 3.4-4.6 volume % and iron oxide 0.6-1.8 volume %, but it is recommended that sum of the each oxides is 100 volume %.
• Phase transfer temperature of the latent-regenerative material is 103 0 C and the capacity of regeneration is 253 kcal/kg and it has the distinctive property that radiates certain temperature of energy consistently.
• the pipe line of hot oil medium (182) is installed passing through inside of the regenerative band (181), and it allows the hot oil medium circulating inside of the regenerative band (181).
• the reason that the hot oil medium is allowed to circulate is to expand the surface area and to maximize heat transfer to store or radiate in the heat radiation process from high temperature of the hot oil medium to the latent-regenerative material. Therefore, as shown in Fig. 4 according to the present embodiment, it is recommended that the multiple pipe line of the hot oil medium (182) is aligned in a radial shape at inside of the regenerative band (181).
• one end of the present pipe line of hot oil medium (182) is connected to the input (184) of hot oil medium and the other end is connected to the output of the hot oil medium (185).
• the external container (183) is installed to wrap the regenerative band (181) as described above, and isolates from the outside. It is designed with an insulation material to isolate the regenerative band (181) from the outside so that it does not release energy to the outside but only allow heating the hot oil medium.
• the heat exchange part (180), according to the present embodiment, is installed to wrap the regenerative band (181) located at between the regenerative band (181) and the external container (183), and it is recommended that the additional hot oil medium layer (186) is installed inside where the hot oil medium traveling the pipe line of hot oild medium (182) is filled.
• This layer (186), as shown in Figs. 3 and 4, is installed to wrap the regenerative band (181) completely, and the hot oil medium traveling the pipe line of hot oild medium (182) is filled inside. Since the hot oil medium layer (186) is installed to cover the regenerative band (181), it stores heat in the regenerative band in maximum and radiates for the sake of heating of the hot oil medium.
• the heat exchange part (180), as shown in Fig. 3, is installed on the top of the external container (183) and in the case that it is connected to the pipe line of hot oild medium (182), and the volume of the hot oil medium in the circulation line is increased, and it is recommended to install the supplementary reservoir (187) to keep the incoming hot oil medium.
• the supplementary reservoir (187) is connected to the pipe line of the hot oil medium (182) and it can take increased volume portion.
• the supplementary reservoir (187) it is recommended to install the input hole (188) of the hot oil medium to inject the hot oil medium. In the case of shortage of the hot oil medium, the oil medium is filled again through the input hole (188) to get heat transfer smoothly.
• the heat exchange part (180), according to the present embodiment, is installed at inside of the external container (183) and it is recommended that the supplementary heat source (189) which heats the hot oil medium and the latent-regenerative material is further installed.
• This supplementary heat source (189) is the preparatory heat source to be operated when the heat from the latent-regenerative material cannot keep temperature of the asphalt. Therefore, according to the present embodiment, it is recommended that the supplementary heat source (189) is controlled to operate when it is decreased below the fixed temperature preliminarily. Therefore, the temperature sensors are further provided to detect temperature of the hot oil medium and the latent-regenerative material (184a, 185a, 181a) precisely. In these sensors shown in Fig.
• the electric heater which shows high heat efficiency, is used as the supplementary heat source (189).
• the fixed temperature in which the supplementary heat source (189) is programmed to operate is set up at 5 0 C higher than phase transfer temperature of the asphalt.
• ASCON manufacturing apparatus (100) is installed at the hot oil medium layer and it is recommended that the measuring part (not shown) is installed to measure the level of the hot oil medium, which fills the hot oil medium layer.
• the measuring part has a role that it measures the amount of the hot oil medium in the heat exchange part and supplies if necessary.
• ASCON manufacturing apparatus (200) comprises the asphalt reservoir (210), the feeder part of the pavement material (220), the weighing part (230), the mixing part (240), the circulation line of the hot oil medium (250) and the heating part (260). Since the asphalt reservoir (210), the feeder part of the pavement material (220), the weighing part (230), the mixing part (240), the circulation line of the hot oil medium (250) and the circulation pump (270) show the identical constitution and function described in the preferred embodiment 1, we do not explain repeatedly.
• the heating part (260) is installed for the mean of heating (not shown) and transferring (not shown) of the hot oil medium which is stored inside.
• the mean of heating is generally an electric heater to heat the hot oil medium of ASCON manufacturing apparatus.
• the mean of heat exchange has a role that it stores heat when ASCON manufacturing apparatus is operating, and it radiates to heat the asphalt when ASCON manufacturing apparatus is discontinued. It has a similar structure of the heat exchange part as described in the preferred embodiment 1.
• the heating mean is to heat the hot oil medium, and the latent-regenerative material of the heat exchange mean stores heat generated, then radiates heat when the electric heater is not operating.

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• Engineering & Computer Science (AREA)
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• Chemical & Material Sciences (AREA)
• Civil Engineering (AREA)
• Architecture (AREA)
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• Materials Engineering (AREA)
• Chemical Kinetics & Catalysis (AREA)
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• Organic Chemistry (AREA)
• Mechanical Engineering (AREA)
• Dispersion Chemistry (AREA)
• Road Paving Machines (AREA)

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Citations (6)

• 2005
  • 2005-05-12 KR KR1020050039775A patent/KR20060117052A/ko not_active Application Discontinuation
  • 2005-05-13 WO PCT/KR2005/001405 patent/WO2006121226A1/en active Application Filing

Patent Citations (6)

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