WO2018113266A1

WO2018113266A1 - Foaming asphalt preparation device and usage method therefor

Info

Publication number: WO2018113266A1
Application number: PCT/CN2017/092187
Authority: WO
Inventors: 郭兆民; 张玉贞; 肖护兵; 徐萌
Original assignee: 江苏一诺路桥工程技术检测有限公司; 江苏天诺道路材料科技有限公司
Priority date: 2016-12-19
Filing date: 2017-07-07
Publication date: 2018-06-28

Abstract

Disclosed are a foaming asphalt preparation device and a usage method therefor. The foaming asphalt preparation device comprises an asphalt pump (1) and a foaming agent pump (2) respectively connected to an asphalt supply system and a foaming agent supply system, wherein discharge pipelines of the asphalt pump (1) and the foaming agent pump (2) are both connected to a mixer (3), an outlet of the mixer (3) is connected to a feeding and discharging pipeline (14) of a pressure tank (6) via a pressurizing apparatus (4) and a pressure tank feeding valve (5), and the feeding and discharging pipeline (14) of the pressure tank (6) is connected to a discharging pipe via a pressure tank discharging valve (7). The foaming asphalt preparation device further comprises a pressure tank heating system, a pressure tank pressure stabilizing system and a stirring system. The usage method for the foaming asphalt preparation device comprises the following steps: step one: raw asphalt and a foaming agent, which respectively pass through an asphalt pump (1) and a foaming agent pump (2), being metered and then entering a mixer (3) so as to be sufficiently mixed; step two: the mixed material being pressurized by a pressurizing apparatus (4) and then entering a pressure tank (6), and a pressure tank pressure stabilizing system carrying out pressure stabilization so as to realize stable storage; step three: after being kept at a constant temperature, being kept at a constant pressure and being stirred, these respectively being carried out by a pressure tank heating system, the pressure tank pressure stabilizing system and a stirring system, foaming asphalt inside the pressure tank (6) being metered by a weighing and metering system of the pressure tank (6) after a foaming temperature and a pressure condition are reached; and step four: when in use, the pressure tank (6) being transported to a construction site, a discharge outlet of the pressure tank (6) being connected to an onsite mixture stirring tank, and discharging the foaming asphalt by means of the pressure of the pressure tank pressure stabilizing system so as to form foamed asphalt for preparing an asphalt mixture by means of stirring. The device realizes continuous industrialized production, and the product quality is stable.

Description

Foamed asphalt preparation device and using method thereof

Technical field

The invention relates to a preparation technology of pavement engineering asphalt materials, in particular to a foaming asphalt preparation device and a using method thereof.

Background technique

The study found that for the asphalt mixture production process, the temperature per 10 tons of asphalt will reduce the production of 0.9 kg of CO ₂ per ton of asphalt mixture. If the mixing temperature of the asphalt mixture can be reduced by 30 °C than the conventional temperature, the CO ₂ emissions of the ordinary asphalt mixture will be reduced by 14%, and the CO ₂ emissions of the modified asphalt mixture will be reduced by 13%. In addition, the use of warm mix asphalt will save 30%-35% fuel consumption compared to hot mix asphalt. In this context, foamed asphalt warm mixing technology came into being.

At present, the production of foamed asphalt is to use the asphalt storage tank and heating facilities of the mixing building, and add an asphalt foaming device to obtain the foamed asphalt before the mixing tank. The foamed asphalt used is now found, and the problems of foaming effect, quality of foamed asphalt and the like can only be discovered through experience. The use of mixing floor on the pavement construction site to prepare foamed asphalt not only increases the workload of the mixing tower, but also does not guarantee the quality of the asphalt; it also limits the application range of the foamed asphalt, and is small for some small micro-care operations. The use of the project is extremely inconvenient.

Summary of the invention

An object of the present invention is to provide a foamed asphalt preparation apparatus which can stably store and transport foamed asphalt, and can easily form a foamed asphalt material at a construction site; another object of the present invention is to provide a foaming asphalt material The use method of the foaming asphalt preparation device enables the continuous production of foamed asphalt in the factory, the product quality is stable, and the storage and transportation are stable, and the use is convenient.

The foamed asphalt preparation device of the invention comprises an asphalt pump and a foaming agent pump, a material mixer, a foamed asphalt buffer tank, a pressurizing equipment and a foamed asphalt storage device respectively connected to the asphalt feeding system and the foaming agent feeding system. , into and out of the pipeline and other components.

Preferably, the foamed asphalt storage device comprises a pressure tank, an inlet and outlet system, a stirring system, a heating system, a metering system, a constant pressure system, and a safety control system.

Preferably, the pressure tank: capable of storing foamed asphalt; the feeding and discharging system: having an inlet and outlet control valve capable of accessing materials in the pressure tank; the stirring system: including a stirring blade located in the pressure tank and used to drive the stirring Power plant for mixing blades; heating system: capable of heating materials in pressure tanks; metering system: capable of metering materials; constant pressure system: capable of applying constant pressure to pressure tanks; safety control system capable of controlling pressure tanks Internal temperature and pressure.

Preferably, the wall of the pressure tank includes an outer wall of the tank, a heat insulating layer and a heat insulating outer layer from the inside to the outside.

Preferably, the feeding and discharging system comprises an inlet and outlet pipe into which the inlet and outlet ports extend into the pressure tank, and the inlet and outlet ports extending into the pressure tank are located in the sump recessed in the bottom of the pressure tank.

Preferably, the power unit of the agitation system is a motor or a hydraulic motor.

Preferably, the heating system comprises a heat transfer oil coil located in the pressure tank, and the heat transfer oil coil is mounted on the bracket at the bottom of the pressure tank and communicates with the heat transfer oil furnace outside the pressure tank.

Preferably, the heating system further includes a heated flue through the interior of the pressure tank and a burner at the beginning of the heated flue.

Preferably, the constant pressure system comprises a control check valve connected to the inlet of the pressure tank, and an air compressor connected to the control check valve through the intake line, and connected to the air compressor and the control check valve. Automatic regulator valve between.

Preferably, the metering system comprises a weighing module located below the pressure tank, the weighing module being associated with an inlet and outlet control valve on the inlet and outlet lines.

Preferably, the safety control system includes a temperature sensor on the pressure tank, a pressure sensor, a safety control valve, and a load cell at the bottom of the pressure tank, and a connection temperature sensor, a pressure sensor, a safety control valve, a load cell, and an inlet and outlet. Electrical control module for the material control valve.

Preferably, the pressure tank has a volume of from 100 ml to 10,000 m3.

The foamed asphalt preparation device of the present invention comprises an asphalt pump and a foaming agent pump respectively connected to the asphalt feeding system and the blowing agent feeding system, and the discharging pipes of the asphalt pump and the blowing agent pump are connected to the mixer. The outlet of the mixer is connected to the inlet and outlet lines of a pressure tank via a pressurization device and a pressure tank feed valve; the inlet and outlet lines of the pressure tank are also connected to the discharge pipe through a pressure tank discharge valve; the device also includes There is a pressure tank heating system capable of heating the material in the pressure tank, and a pressure tank pressure system capable of maintaining a certain pressure tank higher than the normal pressure, and a stirring system capable of stirring the material in the pressure tank.

Preferably, the inlet side of the asphalt pump and the blowing agent pump are respectively provided with an asphalt warming device and a foaming agent warming device for heating the asphalt and the foaming agent.

Preferably, the asphalt pump and the foaming agent pump outlet side are respectively connected with an asphalt mass flow meter and foaming Mass flow meter.

Preferably, the material mixer is a static mix agitator or shear, or a colloid mill, or a known mechanical device capable of mixing bitumen with a blowing agent.

Preferably, the pressurization device is an air ejector or other pressurized device capable of compressing the foamed asphalt.

Preferably, a foamed asphalt buffer tank is connected between the material mixer outlet side and the pressurization device.

Preferably, the inlet and outlet pipelines are provided with a pipeline heating and heat preservation device.

Preferably, the foamed asphalt preparation device uses the following materials as follows:

1) The raw materials used are asphalt and foaming agent, water;

2) the asphalt is road asphalt or heavy traffic road asphalt with a penetration degree of 10-300, or modified asphalt produced by adding a known modifier; the foaming agent is water or a soap containing a surfactant Or other known media that can be used for asphalt foaming;

3) The mass ratio of the blowing agent to the pitch is from 0.1:99.9 to 80:20.

The method for preparing and using the foamed asphalt of the present invention is based on the above-mentioned foamed asphalt preparation device, comprising the following steps,

Step 1: The temperature of the raw material asphalt is heated to 100-180 ° C, and the foaming agent is passed through the asphalt pump and the foaming agent pump respectively. After metering, it enters the mixer and is thoroughly mixed and homogenized; the foaming agent is water or contains a surfactant. a soap liquid or other known medium capable of being used for asphalt foaming, the mass ratio of the blowing agent to the raw material pitch is from 0.1:99.9 to 80:20;

Step 2: The material fully mixed by the mixer is pressurized by the pressurization device and then enters the pressure tank. The mixture material after the pressure tank is pressurized by the pressure tank regulator system to achieve stable storage; according to the temperature and the temperature of the material The saturated vapor pressure of the foaming agent determines the pressure range of the regulator system at 0.05mpa-10mpa.

Step 3: The foamed asphalt in the pressure tank is subjected to constant temperature, constant pressure and agitation through a pressure tank heating system, a pressure tank voltage stabilization system and a stirring system, and the weighing and measuring system on the pressure tank is achieved after the foaming temperature and pressure conditions are reached. Measured.

Step 4: When in use, transport the pressure tank to the construction site, connect the discharge port of the pressure tank and the mixing mixture tank on the site through the interface, and discharge the foamed asphalt by the pressure of the pressure tank regulator system to form foamed asphalt for Mix the asphalt mixture.

Further, the method of the invention realizes the proportional control of the asphalt and the foaming agent through the linkage control of the mass flow rate of the asphalt and the mass flow rate of the foaming agent by the control system; the pressure of the foaming agent and the asphalt through the control system Temperature linkage control, so that the pressure of the foaming agent is greater than the saturated vapor pressure of the foaming agent under the asphalt temperature to ensure the stable injection of the foaming agent; the pressure of the pressure tank and the asphalt temperature are controlled by the control system to make the pressure of the pressure tank The saturated vapor pressure of the blowing agent is greater than the temperature of the asphalt, so that the blowing agent in the pressure tank is in a liquid phase state.

Compared with the prior art, the invention has the advantages of adopting a continuous production process and a unique storage system, and adopting the principle of controlling the saturated vapor pressure of the foaming agent to realize continuous production in a factory, and obtaining a foamed asphalt with stable quality; continuous The produced foamed asphalt is stably stored through a specific storage device; the different volume selection of the storage device enables continuous and stable supply to users of various needs; through the self-contained complete equipment on the storage device Continuous supply to the user reduces the investment of the user's fixed equipment and the quality, cost and environmental protection pressure of the user's own production process; the factory quality control of the production process and the unique storage device ensure the stability of product quality.

DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing the structure of a foamed asphalt preparation apparatus according to an embodiment of the present invention.

In the figure: 1-asphalt pump; 2-foaming agent pump; 3-mixer; 4-pressurizing equipment (air ejector); 5-pressure tank feeding valve; 6-pressure tank; 7-pressure tank Material valve; 8-asphalt heating device; 9-foaming agent heating device; 10-asphalt mass flowmeter; 11-foaming agent mass flowmeter; 12-foamed asphalt buffer tank; 13-stacking tank; -Inlet and outlet pipeline;15-heat-conducting oil coil;16-heating flue;17-pressure tank outer wall; 18-insulation layer; 19-insulation outer board; 20-sleeve; 21-stirring blade; 22-sealing 23-stirring motor; 24-weighing module; 25-air pressure unit; 26-automatic pressure regulator; 27-control check valve; 28-inlet and outlet system; 29-stirring system; 30-inlet and outlet 31-heat-conducting oil furnace; 33-heating system; 35-burner; 60-constant pressure system; 71-electrical control module; 72-temperature sensor; 73-pressure sensor; 74-safety control valve.

detailed description

Embodiment 1:

The foamed asphalt preparation apparatus of this embodiment comprises an asphalt pump 1 and a blowing agent pump 2 respectively connected to an asphalt feeding system and a blowing agent feeding system, and the discharging lines of the asphalt pump and the blowing agent pump are connected to Mixer 3, the outlet of the mixer is connected to the inlet and outlet line 14 of a pressure tank 6 via a pressurizing device 4 (air ejector) and a pressure tank feed valve 5; the inlet and outlet lines of the pressure tank 6 are also pressurized The tank discharge valve 7 is connected to the discharge pipe; the device further comprises a pressure tank heating system capable of heating the material in the pressure tank, and a pressure tank voltage stabilization system capable of maintaining a certain pressure above the normal pressure in the pressure tank, and Ability to mix materials in pressure tanks Stirring system. An asphalt warming device 8 and a blowing agent warming device 9 for heating the asphalt and the foaming agent are respectively disposed at the inlet sides of the asphalt pump 1 and the blowing agent pump 2.

An asphalt mass flow meter 10 and a blowing agent mass flow meter 11 are also connected to the outlet side of the asphalt pump and the blowing agent pump, respectively.

A foamed asphalt buffer tank 12 is connected between the outlet side of the mixer 3 and the pressurizing device 4.

The inlet and outlet ports of the inlet and outlet lines 14 in the pressure tank 6 are located in the accumulation tank 13 at the bottom of the pressure tank inner chamber.

The pressure tank heating system includes a heat transfer oil coil 15 located in the interior of the pressure tank and connected to the external heat transfer oil furnace and a heating flue 16 passing through the pressure tank inner chamber and connected to the external burner.

The working process: the raw material asphalt is heated by the asphalt heating device 8 to the process temperature, and then pumped by the asphalt pump 1 to pass through the asphalt mass flow meter 10 and the asphalt proportional control valve to control the flow rate and then enter the mixer 3 and the foaming agent. Mixing; the foaming agent is heated and controlled by the foaming agent heating device 9 to the process temperature, and then pumped by the foaming agent pump 2, and the flow rate is controlled by the foaming agent mass flow meter 11 and the blowing agent proportional control valve. After that, the mixer 3 is mixed with the raw material asphalt; the mixed liquid thoroughly mixed by the mixer 3 is passed through the double pressure valve to the foamed asphalt buffer tank 12 for stable foaming, and the stabilized foamed asphalt is pressurized by the pressure device 4 (Air ejector) is subjected to remixing and compression through the line into the pressure tank 6. The quality index of the whole production foaming process is automatically controlled by the control system. During the process, the raw material asphalt flow rate and the blowing agent flow rate are controlled by the outlet proportional control valve, which realizes the fine control of the ratio of asphalt and foaming agent; the pressure of the foaming agent The linkage control with the asphalt temperature ensures that the pressure of the blowing agent is greater than the saturated vapor pressure of the blowing agent at the asphalt temperature to achieve a stable production process.

The storage part of the device consists of a pressure tank, a stirring system, a pressure tank heating system, an inlet and outlet metering system, a pressure tank regulator system and a safety control system. The realization scheme is as follows: 1. Pressure tank: The pressure tank body is composed of the tank outer wall 17, the heat insulation layer 18, and the heat preservation outer layer 19, and the pressure of the pressure tank should be 1.0 of the saturated steam pressure of the foaming agent at the foaming temperature. Second, the stirring system: the agitator is arranged inside the pressure tank, and is composed of a sleeve 20, a stirring blade 21, a sealing member 22 and a stirring motor 23. The design of the agitator satisfies the uniformity and stability of the finished product, and the sealing member 22 meets the pressure requirements, the stirring motor 23 satisfies the stirring power; Third, the pressure tank heating system: the pressure tank heating system consists of two kinds of heaters, which is convenient for practical use. One is a heat conduction oil heating system, and the heat conduction oil coil 15 is installed on the steel support at the bottom to ensure the stability of the coil; the ratio of the heat exchange area of the heat transfer oil coil to the tank volume is not less than 30%; the heat conducting coil It is connected with the heat conduction oil furnace on the outside of the tank to directly supply heat. The second type is the direct flame heating system. The heating flue 16 adopts double return design to ensure the maximum use of heat, and the external direct setting is connected with the burner. Simple, convenient and practical, it can be used in temporary emergency or emergency shipments. 4. Inlet and discharge metering system: The pressure tank inlet valve 5 and the pressure tank discharge valve 7 are all controlled by automatic control valves. The inlet and outlet valve interfaces are respectively connected by convenient quick interfaces, and the inlet and outlet pipelines 14 adopt a jacketed structure. Allowing the incoming and outgoing materials to be achieved in a short time. The inlet and outlet of the inlet and outlet line 14 are connected to the sump at the bottom of the pressure tank to ensure that the finished product in the pressure tank can be discharged at one time during discharge. The pressure tank inlet valve 5 and the pressure tank discharge valve 7 are linked with the weighing module 24 at the bottom of the tank to ensure accurate metering of the incoming and outgoing materials. The pressure between the pressure tank pressure and the asphalt temperature is controlled to ensure that the pressure of the foamed asphalt tank is greater than the saturated vapor pressure of the foaming agent at the asphalt temperature, so that the foaming agent in the foamed asphalt tank is in a liquid phase state. V. Pressure tank regulator system: The stability of the system pressure is directly related to the quality of foamed asphalt. The stable pressure is the precondition for the coexistence of foaming agent and asphalt. The pressure tank regulator system is provided with a power source by the air compressor unit 25, and is connected to the automatic pressure regulator valve 26 through the air pipeline, and the stabilized compressed air is communicated with the pressure tank through the control check valve 27. In the storage stage of the foamed asphalt, the pressure of the pressure tank is always kept constant, and a certain pressure is applied during the discharge of the system to press out the finished foamed asphalt. The system does not require additional asphalt pumping and is directly pressed by pressure. VI. Safety Control System: The safety control system is connected by the electrical control box and the temperature sensor pt100, pressure sensor and safety control valve on the pressure tank to monitor and control the pressure and temperature of the pressure tank at any time. Ensure safe and smooth control of the pressure tank. It is connected with the weighing and transmitting module 24 at the bottom of the pressure tank, the pressure tank feeding valve 5, and the pressure tank discharging valve 7, so as to precisely control the quantity of the incoming and outgoing materials.

The device of the embodiment can adopt a portable storage device and a vehicle-mounted storage device to realize convenient flow transfer of the stabilized foamed asphalt to achieve seamless docking from production to use. As long as there is demand for the use of foamed asphalt, no matter how much, it can be achieved through a variety of portable and in-vehicle equipment, which is convenient for users to use, and broadens the use range of foamed asphalt. The entire device can be used directly after being quickly docked with the user's on-site pipeline, eliminating the environmental pressure of user generation process and equipment investment and production process.

Embodiment 2:

20 tons of foamed asphalt were produced by the apparatus and method of the present invention, and the indexes were tested after storage for 1 hour, 5 hours, 15 hours, 48 hours, 72 hours, 240 hours, and 360 hours.

Process conditions:

Raw material asphalt: AH-70# asphalt; temperature 120 ° C

The foaming agent is water at room temperature.

The ratio of the raw material pitch to water is 98%:2% by mass;

Production capacity: 10 tons / hour

The method for implementing the embodiment includes the following steps:

Step 1: The system is preheated, the asphalt pump is started, and the raw material asphalt is preheated by a heat exchanger and a flow meter to be heated to 130±0.5° C., and the ratio of the raw material pitch to the foaming agent (water) is 98%: 2%. Set and adjust the asphalt flow rate to 9.8 tons / hour; start the foaming agent pump, according to the ratio of raw material asphalt and foaming agent (water) is 98%: 2%, set the flow rate of foaming agent to 0.2 tons / In hours, the pressure of the foaming agent pump is adjusted to be greater than the saturated steam pressure of water at a temperature of 130 ± 0.5 degrees of the asphalt temperature of 0.35 mpa.

Step 2: cutting the raw asphalt and water into the mixer simultaneously through the control valve;

Step 3: The mixed material directly enters the foaming chamber under pressure.

Step 4: When the pressure in the foaming chamber reaches 0.35mpa, the air push pump is automatically started, and the foamed asphalt is directly pressed into the storage tank. The control system pressure during the process is not less than 0.35 mpa.

Step 5: Set continuous production for 2 hours. Stop after 2 hours.

Step 6: The pressure in the storage tank is constant ≥0.35mpa and the temperature is 130±0.5 degrees.

Step 6: After shutdown, sample and analyze from the storage device for 1 hour, 5 hours, 15 hours, 48 hours, 72 hours, 240 hours, 360 hours, and analyze the expansion rate and half-life of the foamed asphalt.

By analyzing the foamed asphalt data listed in Table 1, it can be seen that the foamed asphalt stored by the production device and the storage system is very stable.

Table I:

Embodiment 3:

60 tons of foamed asphalt were produced by the apparatus and method of the present invention, and the indexes were tested after storage for 1 hour, 5 hours, 15 hours, 48 hours, 72 hours, 240 hours, and 360 hours.

Process conditions:

Raw material asphalt: SBS modified asphalt I-C; temperature 140 ° C

The foaming agent is water at room temperature.

The ratio of the raw material pitch to water is 97.5%: 2.5% by mass;

Production capacity: 20 tons / hour

The method for implementing the embodiment includes the following steps:

Step 1: The system is preheated, the asphalt pump is started, and the raw material asphalt is preheated by a heat exchanger and a flow meter to be heated to 140±0.5° C., and the ratio of the raw material pitch to the foaming agent (water) is 97.5%: 2.5%. Set and adjust the asphalt flow rate to 19.5 tons / hour; start the foaming agent pump, according to the ratio of raw asphalt and foaming agent (water) is 97.5%: 2.5%, set the flow rate of foaming agent to 0.5 tons / In hours, the pressure of the foaming agent pump is adjusted to be greater than the saturated steam pressure of water at a temperature of 140 ± 0.5 degrees of the asphalt temperature of 0.4 mpa.

Step 3: The mixed material directly enters the foaming chamber under pressure.

Step 4: When the pressure in the foaming chamber reaches 0.4mpa, the air push pump is automatically started, and the foamed asphalt is directly pressed into the storage tank. The control system pressure during the process is not less than 0.4mpa.

Step 5: Set continuous production for 3 hours. Stop after 3 hours.

Step 6: The pressure in the storage tank is constant ≥0.4mpa and the temperature is 140±0.5°C.

By analyzing the foamed asphalt data listed in Table 2, it can be seen that the foamed asphalt stored by the production device and the storage system is very stable.

Table II:

Embodiment 4

10 tons of foamed asphalt were produced by the apparatus and method of the present invention, and the indexes were tested after storage for 1 hour, 5 hours, 15 hours, 48 hours, 72 hours, 240 hours, and 360 hours.

Process conditions:

Raw material asphalt: AH-110; temperature 120 ° C

The foaming agent is water at room temperature.

The ratio of the raw material pitch to water is 97%:3% by mass;

Production capacity: 10 tons / hour

The method for implementing the embodiment includes the following steps:

Step 1: Preheat the system, start the asphalt pump, and heat the raw material asphalt through the heat exchanger and the flow meter to preheat the temperature to 120±0.5°C. The ratio of raw asphalt to foaming agent (water) is 97%:3%. Set and adjust the asphalt flow rate to 9.7 tons / hour; start the foaming agent pump, according to the ratio of raw asphalt and foaming agent (water) is 97%: 3%, set the flow rate of foaming agent to 0.3 tons / In hours, the pressure of the foaming agent pump is adjusted to be greater than the saturated steam pressure of water at a temperature of 120 ± 0.5 degrees of the asphalt temperature of 0.3 mpa.

Step 3: The mixed material directly enters the foaming chamber under pressure.

Step 4: When the pressure in the foaming chamber reaches 0.3mpa, the air push pump is automatically started, and the foamed asphalt is directly pressed into the storage tank. The control system pressure during the process is not less than 0.3 mpa.

Step 5: Set continuous production for 1 hour. Stop after 1 hour.

Step 6: The pressure in the storage tank is constant ≥0.3mpa and the temperature is 120±0.5°C.

By analyzing the foamed asphalt data listed in Table 3, it can be seen that the foamed asphalt stored by the production device and the storage system is very stable.

Table 3:

Embodiment 5

The apparatus and method of the present invention were used to produce 300 tons of foamed asphalt, and the indexes were tested after storage for 1 hour, 5 hours, 15 hours, 48 hours, 72 hours, and 240 hours.

Process conditions:

Raw material asphalt: AH-30# asphalt; temperature 140 °C

The foaming agent is water at room temperature.

The ratio of the raw material pitch to water is 97%:3% by mass;

Production capacity: 30 tons / hour

The method for implementing the embodiment includes the following steps:

Step 1: The system is preheated, the asphalt pump is started, and the raw material asphalt is preheated by the heat exchanger and the flow meter to heat up to 140±0.5°C, and the ratio of the raw material pitch to the foaming agent (water) is 97%:3%. Set and adjust the asphalt flow rate to 29.1 tons / hour; start the foaming agent pump, according to the ratio of raw asphalt and foaming agent (water) is 97%: 3%, set the flow rate of foaming agent to 0.9 tons / In hours, the pressure of the foaming agent pump is adjusted to be greater than the saturated steam pressure of water at a temperature of 140 ± 0.5 ° C of the asphalt temperature of 0.4 mpa.

Step 3: The mixed material directly enters the foaming chamber under pressure.

Step 5: Set continuous production for 10 hours and stop after 10 hours.

Step 6: Sampling and analyzing from the storage device after shutdown for 1 hour, 5 hours, 15 hours, 48 hours, The expansion rate and half-life of the produced foamed asphalt were analyzed at 72 hours and 240 hours.

By analyzing the foamed asphalt data listed in Table 4, it can be seen that the foamed asphalt stored by the production device and the storage system is very stable.

Table 4:

Claims

A foaming asphalt preparation device, comprising: an asphalt pump (1) and a foaming agent pump (2), a material mixer (3), and a foaming machine respectively connected to an asphalt feeding system and a foaming agent feeding system Asphalt buffer tank (12), pressurized equipment (4), foamed asphalt storage device, inlet and outlet pipeline (14) and so on.
The foamed asphalt preparation device according to claim 1, wherein the foamed asphalt storage device comprises a pressure tank, an inlet and outlet system, a stirring system, a heating system, a metering system, a constant pressure system, and a safety control. System composition.
The foamed asphalt preparation apparatus according to claim 2, wherein:

Pressure tank (6) capable of storing foamed asphalt;

The inlet and outlet system (28) has an inlet and outlet control valve for accessing materials in the pressure tank;

a stirring system (29) comprising a stirring blade (21) located in the pressure tank and a power unit (23) for driving the stirring blade;

a heating system (33) capable of heating the material in the pressure tank;

a metering system capable of measuring materials;

a constant pressure system (60) capable of applying a constant pressure to the pressure tank;

The safety control system can control the temperature and pressure in the pressure tank.
The foamed asphalt preparation apparatus according to claim 2, wherein the wall of the pressure tank (6) comprises a tank outer wall (19), a heat insulating layer (18) and a heat insulating outer layer (17) from the inside to the outside. .
The foamed asphalt preparation apparatus according to claim 2, wherein said inlet and outlet system (28) comprises an inlet and outlet port (30) extending into a pressure tank inlet and outlet line (14), said inlet pressure tank The inlet and outlet ports (30) are located in the accumulation trough (13) at the bottom of the recessed pressure tank.
The foamed asphalt preparation apparatus according to claim 2, wherein the power unit of the stirring system is a motor or a hydraulic motor.
The foamed asphalt preparation apparatus according to claim 2, wherein said heating system (33) comprises a heat transfer oil coil (15) located in the pressure tank, and the heat transfer oil coil is mounted on the bottom of the pressure tank ( 40) Connected to the heat transfer oil furnace (31) outside the pressure tank.
The foamed asphalt preparation apparatus according to claim 2, wherein said heating system further comprises a heating flue (16) passing through the inner chamber of the pressure tank and a burner at the beginning of the heating flue (16) (35) ).
The foamed asphalt preparation apparatus according to claim 2, wherein said constant pressure system (60) comprises a control check valve (27) connected to the inlet of the pressure tank, and an intake line and a control sheet The air compressor (25) connected to the valve and the automatic pressure regulator valve (26) connected between the air compressor and the control check valve.
The foamed asphalt preparation apparatus according to claim 3, wherein the metering system comprises a weighing module (24) located under the pressure tank, and the weighing module and the inlet and outlet materials on the inlet and outlet lines (14) The first control valve (5) and the second control valve (7) are linked.
The foamed asphalt preparation apparatus according to claim 2, wherein said safety control system comprises a temperature sensor (72), a pressure sensor (73), a safety control valve (74), and a pressure tank located on the pressure tank. The bottom load cell and the electrical control module (71) that connects the temperature sensor, pressure sensor, safety control valve, load cell and inlet and outlet control valves.
The foamed asphalt preparation apparatus according to claim 2, wherein the pressure tank has a volume of from 100 ml to 10,000 m3.
The foamed asphalt preparation apparatus according to claim 1, characterized in that: the asphalt pump (1) and the inlet side of the blowing agent pump (2) are respectively provided with asphalt heating for heating the asphalt and the foaming agent, respectively. Device (8) and blowing agent warming device (9).
The foamed asphalt preparation apparatus according to claim 1, wherein the asphalt pump (1) and the foaming agent pump (2) are respectively connected with an asphalt mass flow meter (10) and a foaming agent mass on the outlet side thereof. Flow meter (11).
The foamed asphalt preparation apparatus according to claim 1, wherein the material mixer (3) is a static mixing material stirring or shearing machine, or a colloid mill, or a known asphalt and foaming agent. Mixed mechanical device.
The foamed asphalt preparation apparatus according to claim 1, wherein the pressurizing device (4) is an air ejector or other pressurizing device capable of compressing the foamed asphalt.
The foamed asphalt preparation apparatus according to claim 1, characterized in that a foamed asphalt buffer tank (12) is connected between the outlet side of the material mixer (3) and the pressurizing device (4).
The foamed asphalt preparation apparatus according to claim 1, wherein the inlet and outlet line (14) is provided with a pipeline heating and holding device.
A foamed asphalt preparation apparatus according to claim 1, which uses the raw materials as follows:

1) The raw materials used are asphalt and foaming agent, water;

2) the asphalt is road asphalt or heavy traffic road asphalt with a penetration degree of 10-300, or modified asphalt produced by adding a known modifier; the foaming agent is water or a soap containing a surfactant Or other known media that can be used for asphalt foaming;

3) The mass ratio of the blowing agent to the pitch is from 0.1:99.9 to 80:20.
A method of using a foamed asphalt preparation apparatus according to claim 1, comprising the steps of:

Step 1: The temperature of the raw asphalt is heated to 100-180 ° C, and the foaming agent is passed through the asphalt pump and the foaming agent pump respectively. After the amount, enter the mixer and mix well and homogenize; the foaming agent is water or soap containing surfactant or other known medium that can be used for asphalt foaming. The mass ratio of foaming agent to raw asphalt is 0.1: 99.9~80:20;

Step 2: The material fully mixed by the mixer is pressurized by the pressurization device and then enters the pressure tank. The mixture material after the pressure tank is pressurized by the pressure tank regulator system to achieve stable storage; according to the temperature and the temperature of the material The saturated vapor pressure of the foaming agent determines the pressure range of the voltage regulator system is 0.05mpa-10mpa;

Step 3: The foamed asphalt in the pressure tank is subjected to constant temperature, constant pressure and agitation through a pressure tank heating system, a pressure tank voltage stabilization system and a stirring system, and the weighing and measuring system on the pressure tank is achieved after the foaming temperature and pressure conditions are reached. Measured;

Step 4: When in use, transport the pressure tank to the construction site, connect the discharge port of the pressure tank and the mixing mixture tank on the site through the interface, and discharge the foamed asphalt by the pressure of the pressure tank regulator system to form foamed asphalt for Mix the asphalt mixture.
The method according to claim 20, wherein the proportional control of the asphalt and the foaming agent is realized by the control system controlling the mass flow rate of the asphalt and the mass flow rate of the foaming agent; and the pressure of the blowing agent is controlled by the control system. Linkage control with asphalt temperature, so that the pressure of the foaming agent is greater than the saturated vapor pressure of the foaming agent at the asphalt temperature to ensure the stable injection of the foaming agent; the pressure tank and the asphalt temperature are controlled by the control system to control the pressure tank. The pressure is greater than the saturated vapor pressure of the blowing agent at the asphalt temperature, so that the blowing agent in the pressure tank is in a liquid phase.