Homogeneous reaction device for preparing modified asphalt

Abstract

The utility model discloses a homogeneous reaction device for preparing modified asphalt, which comprises a base, a reaction kettle cover plate arranged on the base, a reaction kettle arranged below the reaction kettle cover plate, a heating jacket arranged in the reaction kettle, a cooling water coil pipe arranged in the reaction kettle, a blow-down valve arranged at the bottom of the reaction kettle, and an air inlet pipeline arranged on the reaction kettle cover plate. The gas inlet pipeline extends into the reaction kettle, a feeding system is arranged on the reaction kettle cover plate, a multi-stage stirrer is arranged at the bottom of the reaction kettle cover plate, and the multi-stage stirrer is positioned in the reaction kettle; a condensation liquid separation system is arranged above the reaction kettle cover plate and is used for cooling and recovering a solvent volatilized in the reaction kettle and adjusting the pressure in the reaction kettle. The device disclosed by the utility model is high in conversion efficiency, high in solvent cyclic utilization rate, convenient to operate, easy to industrially amplify, environment-friendly and economical, protects the safety of operators, and realizes amplified preparation and batch production of the modified asphalt.

Description

Technical Field

[0001] This utility model relates to the field of reaction technology for preparing modified asphalt, and specifically to a homogeneous reaction apparatus for preparing modified asphalt. Background Technology

[0002] Coal tar pitch possesses advantages such as good adhesion and wetting properties, good erosion resistance, and a high coefficient of friction for pavements. However, it is highly heat-sensitive, has poor ductility, is prone to aging, and easily pollutes the environment, especially due to its high content of carcinogenic polycyclic aromatic hydrocarbons, which seriously endangers the environment and human health. Therefore, its application is significantly limited, necessitating modification treatment.

[0003] Reactors are commonly used equipment in asphalt modification. In the traditional process of preparing modified asphalt, asphalt fumes are generated, along with the volatilization of additives and solvents, which endanger the safety of personnel and the environment.

[0004] Patent CN 205152152 U improves the production device for modified asphalt, which enhances its application performance to a certain extent. However, its design is complex, it has many pieces of equipment, which increases the cost of the equipment and its applicability is limited.

[0005] Patent CN 205253126 U discloses a laboratory modified asphalt preparation device; patent CN 205269645U discloses an improved modified asphalt reactor device. Although the above two patents adopt a simple single-reactor reactor, their main disadvantages include: first, the lack of a solvent recovery and utilization system makes it difficult to recover and reuse the solvent, which poses problems such as environmental pollution and harm to human health; second, the lack of an independent feeding system prevents online continuous feeding during the experiment, reducing the sustainability and economy of the experiment. Utility Model Content

[0006] To overcome the above technical problems, the purpose of this utility model is to provide a homogeneous reaction device for preparing modified asphalt. This device has high conversion efficiency, high solvent recycling rate, convenient operation, easy industrial scale-up, protects the safety of operators, and is environmentally friendly and economical, realizing the scale-up preparation and mass production of modified asphalt.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0008] A homogeneous reaction apparatus for preparing modified asphalt includes a base 1, a reactor cover plate 2 horizontally arranged on the base 1, a reactor 4 installed below the reactor cover plate 2, the reactor 4 being placed inside a heating jacket 3, a cooling water coil 13 being provided inside the reactor 4, a drain valve 5 being provided at the bottom of the reactor 4, an air inlet pipe 6 being provided on the reactor cover plate 2 extending into the reactor 4, a feeding system 8 being provided on the reactor cover plate 2, and a multi-stage agitator 10 being provided at the bottom of the reactor cover plate 2, the multi-stage agitator 10 being located inside the reactor 4;

[0009] A condensation and separation system 12 is provided above the reactor cover plate 2. The condensation and separation system 12 is used to cool and recover the solvent volatilized in the reactor 4 and to regulate the pressure in the reactor 4.

[0010] The base 1 is L-shaped, and the upper part of the vertical part of the base 1 is directly connected to the reactor cover plate 2. The reactor 4 is fixed to the reactor cover plate 2 by bolts and is detachable. The drain valve 5 is a double valve type connection.

[0011] The air intake line 6 is equipped with a flow regulating valve 7, which is used to control the air volume.

[0012] The multi-stage agitator 10 is driven by a motor to stir the materials inside the reactor 4, and the stirring speed of the multi-stage agitator is 100-4000 r / min. The top of the multi-stage agitator 10 is equipped with a special sealing device to ensure that the reactor 4 can be operated under pressure.

[0013] The feeding system 8 includes a hopper 8-1, an electronic scale 8-2, a pressurized conveyor 8-3, a batching hopper 8-4, and a feeding control valve 8-5;

[0014] The electronic scale 8-2 is placed at the bottom of the silo 8-1. The silo 8-1 is connected to the pressurized conveyor 8-3 by a flexible connection, which facilitates accurate weighing and measurement of the material level in the silo 8-1.

[0015] The batching silo 8-4 is connected to the end of the pressurized conveyor 8-3 and is completely sealed. The feed control valve 8-5 is located on the lower pipeline of the batching silo 8-4. The pipeline distance between the batching silo and the reactor should not be too long, and it should be closed after feeding is completed.

[0016] The pressurized conveyor 8-3 is a GX type screw conveyor or an LS type screw conveyor;

[0017] The reactor cover plate 2 is equipped with a pressure gauge 11 and a safety valve 9. The pressure gauge 11 monitors the pressure of the reactor 4, and the outlet pipeline of the safety valve 9 is connected to the external exhaust pipeline 12-6.

[0018] The condensation and liquid separation system 12 includes a condenser 12-2, a cooling water circulation pump 12-1, a liquid separation tank 12-3, a one-way valve 12-4, a pressure regulating valve 12-5, and an external exhaust pipe 12-6;

[0019] The solvent drawn from the reactor 4 is connected to the inlet of the condenser 12-2 via a pipeline. The outlet of the condenser 12-2 is connected to the upper part of the separator 12-3. The pipeline drawn from the bottom of the separator 12-3 is connected to the reactor cover plate 2. The cooling water for the condenser 12-2 is supplied by the cooling water circulation pump 12-1, and the connection method is bottom inlet and top outlet.

[0020] The lower pipeline of the separator 12-3 is equipped with a one-way valve 12-4 and an inverted "V" shaped pipeline. This ensures that the solution at the bottom of the separator 12-3 can smoothly enter the reactor 4, while preventing the solvent in the reactor 4 from evaporating and flowing back into the separator 12-3.

[0021] A pressure regulating valve 12-5 is installed on the output pipeline of the separator 12-3.

[0022] The reactor 4 is equipped with a cooling water coil 13, which is arranged in a spiral pattern, close to the inner wall of the reactor 4 and avoiding the agitator 10 inside the reactor.

[0023] The beneficial effects of this utility model are:

[0024] 1. The reactor is equipped with a multi-stage stirrer, which increases the collision probability and reaction intensity of gas molecules, additives and carbon-containing materials under pressure and high-speed shearing, thereby improving the conversion rate of carbon-containing materials and preparing modified asphalt with good performance.

[0025] 2. A two-stage gas-liquid cooling-separation and recovery device is set up. The solvent that evaporates after heating in the reactor is condensed by the condenser and then enters the separator to achieve gas-liquid separation. The solvent is returned to the reactor, realizing the segmented and efficient collection and recycling of solvent, avoiding the direct discharge of harmful substances and gases, reducing solvent loss and environmental pollution, and reducing harm to human health.

[0026] 3. The entire device adopts a high-pressure, detachable clamp connection, featuring rapid heating and cooling, stable feeding, simple operation, and convenient maintenance. The open heating jacket and detachable reactor and drain valve facilitate unloading, cleaning, and maintenance of the reactor.

[0027] 4. This device has a wide range of raw material adaptability and can process different types of carbon-containing raw materials. It has a wide range of raw material adaptability, high conversion efficiency, and high solvent recycling rate. It is an economical and reasonable utilization scheme for converting carbon-containing materials to prepare modified asphalt. It has the characteristics of high conversion rate, pressurized operation, and easy industrial scale-up, and has good market application prospects. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of this utility model.

[0029] Among them, 1: base; 2: reactor cover; 3: heating jacket; 4: reactor; 5: drain valve; 6: air inlet pipeline; 7: flow regulating valve; 8: feeding system; 8-1: silo; 8-2: electronic scale; 8-3: pressurized conveyor; 8-4: batching silo; 8-5: feed control valve; 9: safety valve; 10: multi-stage agitator; 11: pressure gauge; 12: condensate separation system; 12-1: cooling water circulation pump; 12-2: condenser; 12-3: separator; 12-4: check valve; 12-5: pressure regulating valve; 12-6: external exhaust pipeline; 13: cooling water coil. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings.

[0031] like Figure 1 The apparatus shown is a homogeneous reaction device for preparing modified asphalt. The base 1 is connected to the reactor cover plate 2. The reactor 4 is placed inside the heating jacket 3. The reactor 4 is equipped with a cooling water coil 13. The reactor 4 is equipped with a drain valve 5 at the bottom. The reactor cover plate 2 is equipped with an air inlet pipe 6. The air inlet pipe 6 is equipped with a flow regulating valve 7. The reactor cover plate 2 is equipped with a feeding system 8, a stirrer 10, a pressure gauge 11, a safety valve 9, and a condensation and separation system 12. The outlet pipe of the safety valve 9 is connected to the external exhaust pipe 12-6 of the condensation and separation system 12.

[0032] A condensation and separation system 12 is provided above the reactor cover plate 2. The condensation and separation system 12 is used to cool and recover the solvent volatilized in the reactor 4 and to regulate the pressure in the reactor 4.

[0033] The upper part of the base 1 is directly connected to the reactor cover plate 2. The reactor 4 is fixed to the reactor cover plate 2 by bolts and is detachable. The drain valve 5 adopts a double valve type connection to prevent spherical blockage and quick disassembly. The reactor 4 is placed in the heating jacket 3. The heating rate of the heating jacket 3 is 5~100℃ / min, and the heating temperature is room temperature~1100℃.

[0034] The intake line 6 is equipped with a flow regulating valve 7 to control the gas volume. The gas intake line 6 can supply nitrogen, carbon dioxide, hydrogen, air, oxygen, carbon monoxide, methane, syngas, or one or more combinations thereof.

[0035] A multi-stage agitator 10 is installed in the middle of the reactor cover plate 2. The multi-stage agitator 10 is driven by a motor to stir the materials in the reactor 4. The stirring speed of the multi-stage agitator is 100-4000 r / min. The top of the multi-stage agitator 10 is equipped with a special sealing device to ensure that the reactor 4 can be operated under pressure.

[0036] The reactor cover plate 2 is equipped with a feeding system 8, which includes a silo 8-1, an electronic scale 8-2, a pressurized conveyor 8-3, a batching silo 8-4, and a feed control valve 8-5. Raw materials are added to the silo 8-1, which contains a whistle and a loosening air passage. The raw materials enter the batching silo 8-4 through the pressurized conveyor 8-3. The feed control valve 8-5 is then opened to allow the raw materials to enter the reactor 4. Liquid materials such as additives enter the reactor 4 through the batching silo 8-4. The additives are one or more combinations of benzene glycol, terephthalaldehyde, formaldehyde, sulfuric acid, sodium p-toluenesulfonate, anhydrous aluminum chloride, cyclohexane, toluene, n-butanol, and dichloromethane.

[0037] The electronic scale 8-2 is placed at the bottom of the silo 8-1. The silo 8-1 is connected to the pressurized conveyor 8-3 by a flexible connection, which facilitates accurate weighing and measurement of the material level in the silo 8-1.

[0038] The batching silo 8-4 is connected to the end of the pressurized conveyor 8-3 and is completely sealed. The feed control valve 8-5 is located in the lower pipeline of the batching silo 8-4. The pipeline distance between the batching silo and the reactor should not be too long. The valve is closed after feeding is completed.

[0039] The pressurized conveyor 8-3 can adopt existing technology, such as GX type screw conveyor or LS type screw conveyor. Alternatively, the equipment parameters can be appropriately modified according to process requirements to achieve continuous and stable feeding of solid particles under the conditions of pressure 0.001~4.0MPa, particle size 0~400μm, and feeding rate 1~1000kg / h.

[0040] The reactor cover plate 2 is equipped with a pressure gauge 11 and a safety valve 9. The pressure gauge 11 monitors the pressure of the reactor 4. After the reactor is over-pressurized, the safety valve 9 opens to release pressure and ensure the safety of the device. The outlet pipeline of the safety valve 9 is connected to the external exhaust pipeline 12-6.

[0041] The condensation and separation system 12 includes a condenser 12-2, a cooling water circulation pump 12-1, a separation tank 12-3, a one-way valve 12-4, a pressure regulating valve 12-5, and an external exhaust pipe 12-6. A pipe leading out from the reactor cover 2 connects to the inlet of the condenser 12-2, and the outlet of the condenser 12-2 connects to the upper part of the separation tank 12-3. A pipe leading out from the bottom of the separation tank 12-3 connects to the reactor cover 2. Cooling water for the condenser 12-2 is supplied by the cooling water circulation pump 12-1, with a bottom-in, top-out connection. The solvent in the reactor 4 is condensed by the condenser 12-2 and then enters the separation tank 12-3. Gas is safely discharged from the device through the external exhaust pipe 12-6, and the solvent is recycled back into the reactor 4. The solvent is one or a combination of petroleum ether, acetone, dichloromethane, cyclohexane, and toluene.

[0042] The lower pipeline of the separator 12-3 is equipped with a one-way valve 12-4 and an inverted "V" shaped pipeline to ensure that the solution at the bottom of the separator 12-3 can smoothly enter the reactor 4, while preventing the solvent in the reactor 4 from evaporating and flowing back into the separator 12-3.

[0043] The reactor 4 is equipped with a cooling water coil 13 to accurately control the reaction temperature of the reactor 4 and ensure that the material is cooled in a short time after the reaction is completed. The cooling water coil 13 is arranged in a winding manner, close to the inner wall of the reactor 4 and avoiding the agitator 10 inside the reactor.

[0044] Pressure regulating valve 12-5 can control the pressure of reactor 4. The operating pressure of reactor 4 is 0.001~4.0MPa.

[0045] The working principle of this utility model:

[0046] Step 1. Open the heating jacket 3, fix the reactor 4 to the reactor cover plate 2 with bolts, and close the heating jacket 3;

[0047] Step 2. Zero the electronic scale 8-2 in the feeding system 8, start the pressurized conveyor 8-3, open the feed control valve 8-5, add the prepared raw materials into the silo 8-1, monitor the feed amount through the electronic scale 8-2, and close the pressurized conveyor 8-3 after the required amount for the experiment is reached. Add the required additives to the reaction vessel 4 through the mixing silo 8-4. After the materials are added, close the feed control valve 8-5 and start the multi-stage agitator 10.

[0048] Step 3. Open the flow regulating valve 7 on the air inlet line 6 to introduce the experimental gas into the reactor 4. Set the temperature of the cooling water circulation pump 12-1 to allow the cooling water to enter the condenser 12-2. Observe the pressure inside the reactor 4 at any time through the pressure gauge 11 and control it through the pressure regulating valve 12-5 to keep the device in a safe state. Set and turn on the temperature of the heating jacket 3 to start the temperature rise and carry out the constant temperature reaction.

[0049] Step 4. After the reaction is complete, cool the mixture to a safe range using the cooling water coil 13, open the heating jacket 3, disassemble the reaction vessel 4, and unload the material.

Claims

1. A homogeneous reaction apparatus for preparing modified asphalt, characterized in that, Includes a base (1), a reactor cover plate (2) horizontally arranged on the base (1), a reactor (4) installed below the reactor cover plate (2), the reactor (4) is placed in a heating jacket (3), a cooling water coil (13) is provided inside the reactor (4), a drain valve (5) is provided at the bottom of the reactor (4), an air inlet pipe (6) is provided on the reactor cover plate (2), the air inlet pipe (6) extends into the reactor (4), a feeding system (8) is provided on the reactor cover plate (2), and a multi-stage agitator (10) is provided at the bottom of the reactor cover plate (2), the multi-stage agitator (10) is located inside the reactor (4); A condensation and separation system (12) is provided above the reactor cover plate (2). The condensation and separation system (12) is used to cool and recover the solvent volatilized in the reactor (4) and to regulate the pressure in the reactor (4).

2. The homogeneous reaction apparatus for preparing modified asphalt according to claim 1, characterized in that, The base (1) is L-shaped. The upper part of the vertical part of the base (1) is directly connected to the reactor cover plate (2). The reactor (4) and the reactor cover plate (2) are fixed by bolts and are detachable. The drain valve (5) is a double valve type connection.

3. The homogeneous reaction apparatus for preparing modified asphalt according to claim 1, characterized in that, The air intake line (6) is equipped with a flow regulating valve (7), which is used to control the air volume.

4. The homogeneous reaction apparatus for preparing modified asphalt according to claim 1, characterized in that, The feeding system (8) includes a hopper (8-1), an electronic scale (8-2), a pressurized conveyor (8-3), a batching hopper (8-4), and a feeding control valve (8-5); The electronic scale (8-2) is placed at the bottom of the silo (8-1). The silo (8-1) and the pressurized conveyor (8-3) are connected by a flexible connection, which facilitates accurate weighing and measurement of the material level in the silo (8-1). The batching silo (8-4) is connected to the end of the pressurized conveyor (8-3) and is completely sealed. The feed control valve (8-5) is located in the lower pipeline of the batching silo (8-4).

5. The homogeneous reaction apparatus for preparing modified asphalt according to claim 4, characterized in that, The pressurized conveyor (8-3) is a GX type screw conveyor or an LS type screw conveyor.

6. The homogeneous reaction apparatus for preparing modified asphalt according to claim 1, characterized in that, The reactor cover plate (2) is equipped with a pressure gauge (11) and a safety valve (9). The pressure gauge (11) monitors the pressure of the reactor (4), and the outlet pipeline of the safety valve (9) is connected to the external exhaust pipeline (12-6).

7. The homogeneous reaction apparatus for preparing modified asphalt according to claim 6, characterized in that, The condensation and liquid distribution system (12) includes a condenser (12-2), a cooling water circulation pump (12-1), a liquid distribution tank (12-3), a one-way valve (12-4), a pressure regulating valve (12-5), and an external exhaust pipeline (12-6); The solvent drawn from the reactor (4) is connected to the inlet of the condenser (12-2) via a pipeline. The outlet of the condenser (12-2) is connected to the upper part of the separator (12-3). The pipeline drawn from the bottom of the separator (12-3) is connected to the reactor cover plate (2). The cooling water for the condenser (12-2) is supplied by the cooling water circulation pump (12-1). The connection method is bottom inlet and top outlet. The lower pipeline of the separator (12-3) is equipped with a one-way valve (12-4) and an inverted "V" shaped pipeline; A pressure regulating valve (12-5) is installed on the output pipeline of the separator (12-3).

8. The homogeneous reaction apparatus for preparing modified asphalt according to claim 1, characterized in that, The reactor (4) is equipped with a cooling water coil (13), which is arranged in a spiral manner, close to the inner wall of the reactor (4) and away from the agitator (10) inside the reactor.

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