Preparation device of modified asphalt based on natural asphalt

Abstract

A preparation device of modified asphalt based on natural asphalt comprises a colloid mill, an inlet of the colloid mill is connected with a reserved pump through a pipeline, the reserved pump is connected with a first three-way valve through a pipeline, and the first three-way valve is connected with a stock bin and a buffer tank through pipelines. The pipeline at the outlet of the colloid mill is sequentially connected with a second three-way valve and a third three-way valve, the second three-way valve is connected with the first finished product tank through a pipeline, and the third three-way valve is connected with the buffer tank through a pipeline. The invention provides a preparation device of modified asphalt based on natural asphalt. According to the technical scheme, on the basis of existing production equipment, a small number of three-way valves and pipelines are additionally arranged, production of natural asphalt ingredients for replacing modifiers such as SBS can be achieved only by additionally arranging two small-size tank bodies in an existing plant, and therefore modified asphalt based on natural asphalt can be further produced, and the equipment cost and the raw material purchasing cost are greatly saved.

Description

Technical Field

[0001] The present invention relates to the technical field of highway maintenance, and more specifically to a preparation device for modified asphalt based on natural asphalt. Background Art

[0002] Asphalt is a dark brown complex mixture composed of hydrocarbon compounds with different molecular weights and their non-metallic derivatives. Most of it exists in the form of liquid or semi-solid petroleum, with a black surface. It is mainly divided into three types: coal tar asphalt, petroleum asphalt, and natural asphalt. As an important chemical raw material and product, the annual consumption in China is nearly 30 million tons, and it is widely used in industries such as coatings, plastics, rubber, and road paving. Among them, road construction is the main field of asphalt consumption, accounting for more than 80%, and mainly using petroleum asphalt. However, with the sharp increase in traffic volume and frequent extreme climate conditions, petroleum asphalt pavements are difficult to meet the requirements of modern roads for resisting heavy loads and high-temperature deformation. Therefore, more than 90% of the road surface layers need to use modified asphalt, that is, modifying petroleum asphalt with SBS, natural asphalt, rubber powder, etc. to improve the performance of petroleum asphalt. Among them, polymer modification technology represented by SBS accounts for more than 90%. However, the main problem of polymer modifiers is their insolubility with petroleum asphalt. The polymers are distributed in the asphalt in a physical dispersion state, prone to segregation and degradation, and have insufficient aging resistance, resulting in a short lifespan of asphalt pavements.

[0003] Natural asphalt is a type of petroleum asphalt that has been gradually formed in nature over a long time under the extrusion of the earth's crust and contact with air and water. It exists in a natural form and often contains a certain proportion of minerals, such as carbonates, clay, kaolin, illite, etc. Compared with petroleum asphalt, which is a by-product of crude oil processing, natural asphalt has a low content of light components and few available components. Using natural asphalt as a raw material for building road asphalt can improve the high-temperature deformation resistance, water damage resistance, and durability of the road surface. Therefore, natural asphalt is used as an admixture material for modification in many key domestic and foreign projects. At the same time, as an unconventional petroleum resource, natural asphalt has characteristics such as a complex structure, high density, high viscosity, high carbon-hydrogen ratio, and high metal content, which are of great significance for improving road performance. The application of natural asphalt in the field of road construction can significantly improve the road use performance.

[0004] Xi'an Zhongli Asphalt Co., Ltd. is a participating unit in the industry standard of the Ministry of Transport, "Asphalt and Asphalt Mixture Modifying Additives: Part 8 High Modulus Agent". It provides a processing technology and formula for natural asphalt finished binder in Chinese Patent CN 107057386 B, a preparation and application method for storable high modulus natural asphalt binder in Chinese Patent CN 107118578 B, and also provides a complete set of natural asphalt processing equipment in Chinese Patent CN 208776662 U.

[0005] In the production base supporting the enterprise where the applicant is located, due to location restrictions, it is currently impossible to fully deploy the relevant supporting equipment for processing starting from natural asphalt raw materials according to the technical solution of CN208776662 U. Considering that domestic enterprises such as Xi'an Zhongli Asphalt Co., Ltd. also sell atomized natural asphalt powder, the inventor team considered modifying the existing production equipment to realize the production of natural asphalt ingredients as modifiers, so as to be able to use the existing equipment to complete the preparation of modified asphalt based on natural asphalt.

[0006] Figure 1 It is a schematic structural principle diagram of a production equipment for emulsified asphalt. Refer to Figure 1 As shown, in the production base supporting the enterprise where the applicant is located, the existing emulsified asphalt production equipment mainly includes a Delixi 130KW colloid mill. There is a control cabinet on one side of the colloid mill and a heat exchanger on the other side. The inlet of the colloid mill is connected to a soap solution tank and an asphalt tank respectively through pipelines. The outlet of the colloid mill is connected to the heat exchanger through a pipeline. The heat exchanger is connected to a finished product tank through a pipeline. Figure 1 Arrows are used in to indicate the conveying direction of the logistics in the pipeline. The production principle of emulsified asphalt is that the soap solution at about 60 degrees produced by the soap solution tank and the matrix asphalt at about 180 degrees transported after being heated by the asphalt tank are transported to the colloid mill through pipelines, and are ground, dispersed and emulsified in the colloid mill. The product at about 120 degrees in the outlet pipeline of the colloid mill is transported to the heat exchanger through a pipeline, cooled to about 80 degrees and then transported to the finished product tank for storage through a pipeline.

[0007] A soap solution pump 1 and a three-way valve 2 are sequentially arranged through pipelines between the soap solution tank and the colloid mill. There is also a soap solution return pipe between the three-way valve 2 and the soap solution tank. Before production, it is necessary to set the three-way valve 2 so that after starting the soap solution pump 1, the soap solution can flow back to the soap solution tank through the soap solution return pipe, which can ensure that the temperature of the soap solution in the pipeline before entering the colloid mill reaches equilibrium. When the colloid mill starts to work, only need to set the three-way valve 2 to cut off the connection with the soap solution return pipe and make the soap solution flow into the colloid mill. Similarly, when the colloid mill stops working, only need to set the three-way valve 2 to make the soap solution flow back to the soap solution tank, and then turn off the soap solution pump 1. Considering that different formulations may additionally add some other colloid materials, a reserved pump 3 is additionally connected to the inlet end of the colloid mill through a pipeline. The reserved pump 3 is provided with a reserved pipeline interface, so that when adjusting the product formulation, the colloid material can be conveniently input into the colloid mill through the reserved pump 3.

[0008] How to Figure 1Based on the existing emulsified asphalt production equipment, it becomes a problem to be solved to produce the natural asphalt ingredients used as modifiers with as little modification as possible, so as to complete the preparation of modified asphalt based on natural asphalt. Summary of the Invention

[0009] The technical problem to be solved by the present invention is to provide a device for preparing modified asphalt based on natural asphalt to reduce or avoid the problems mentioned above.

[0010] The present invention provides a device for preparing modified asphalt based on natural asphalt, which includes a colloid mill. A reserved pump is connected to the inlet of the colloid mill through a pipeline. The reserved pump is connected to a first three-way valve through a pipeline. The first three-way valve is respectively connected to a feed bin and a buffer tank through pipelines. A second three-way valve and a third three-way valve are sequentially connected to the pipeline at the outlet of the colloid mill. The second three-way valve is connected to a first finished product tank through a pipeline, and the third three-way valve is connected to the buffer tank through a pipeline.

[0011] Preferably, the feed bin is a rectangular or barrel-shaped structure made of stainless steel, with a capacity of 300 kg to 1 ton.

[0012] Preferably, the buffer tank has a capacity of 1 - 5 tons.

[0013] Preferably, the inlet of the buffer tank is arranged at the upper part of the tank body and is connected to the third three-way valve through a pipeline. The outlet is arranged at the lower part of the tank body and is connected to the first three-way valve through a pipeline. A spiral stirring blade is arranged in the tank body.

[0014] The device for preparing modified asphalt based on natural asphalt provided by the present invention can, on the basis of the existing production equipment, add a small number of three-way valves and pipelines, and only need to add two tanks with smaller sizes in the existing workshop to realize the production of natural asphalt ingredients used to replace modifiers such as SBS, so as to further produce modified asphalt based on natural asphalt, greatly saving the equipment cost and raw material procurement cost. Brief Description of the Drawings

[0015] The following drawings are only intended to illustrate and explain the present invention schematically and do not limit the scope of the present invention. Among them, Figure 1 is a schematic structural principle diagram of a production equipment for emulsified asphalt; Figure 2 is a schematic structural principle diagram of a device for preparing modified asphalt based on natural asphalt according to a specific embodiment of the present invention; Figure 3 is Figure 2 a schematic structural principle diagram of the buffer tank in Detailed Description of the Invention

[0016] In order to have a clearer understanding of the technical features, objectives, and effects of the present invention, the specific embodiments of the present invention will now be described with reference to the accompanying drawings. Among them, the same components are denoted by the same reference numerals.

[0017] Figure 2 Schematic diagram of the structural principle of a preparation device for modified asphalt based on natural asphalt according to a specific embodiment of the present invention; see Figure 2 As shown, the present invention provides a preparation device for modified asphalt based on natural asphalt, which includes a colloid mill. A reserve pump 3 is connected to the inlet of the colloid mill through a pipeline. The reserve pump 3 is connected to a first three-way valve 4 through a pipeline. The first three-way valve 4 is respectively connected to a feed bin and a buffer tank through pipelines. A second three-way valve 5 and a third three-way valve 6 are sequentially connected to the pipeline at the outlet of the colloid mill. The second three-way valve 5 is connected to a first finished product tank through a pipeline, and the third three-way valve 6 is connected to the buffer tank through a pipeline.

[0018] As described in the background art section, the technical solution provided by the present invention is to enable the preparation of modified asphalt based on natural asphalt by making as few modifications as possible to the existing emulsified asphalt production equipment, so as to be able to use commercially available atomized natural asphalt powder. Specifically, the working principle of the technical solution provided by the present invention is as follows: The purchased atomized natural asphalt powder is loaded into the silo. When modified asphalt needs to be produced, first, by setting the first three-way valve 4, the silo is connected to the inlet of the colloid mill. By setting the second three-way valve 5 and the third three-way valve 6, the buffer tank is connected to the outlet of the colloid mill. Start the colloid mill, the asphalt tank storing the matrix asphalt, and the reserved pump 3. According to the pre-formula, the atomized natural asphalt powder and the matrix asphalt are transported to the colloid mill. The natural asphalt mixture that has completed the first mixing in the colloid mill enters the buffer tank through the second three-way valve 5 and the third three-way valve 6. When the amount of natural asphalt mixture in the buffer tank is relatively large and close to full tank, stop the feeding of the asphalt tank storing the matrix asphalt, and set the first three-way valve 4 so that the buffer tank is connected to the inlet of the colloid mill. In this way, the natural asphalt mixture in the buffer tank can circulate repeatedly through the colloid mill for mixing. Through 1-2 hours of repeated mixing, the quality of the natural asphalt mixture can be ensured to meet the design requirements. After that, by setting the second three-way valve 5, the first finished product tank can be connected to the outlet of the colloid mill, so that the natural asphalt mixture in the buffer tank can be transported to the first finished product tank for storage and standby. By repeating this process, enough natural asphalt mixture can be produced. When producing modified asphalt subsequently, the natural asphalt mixture can be directly called from the first finished product tank. The modified asphalt production equipment is existing equipment and will not be elaborated here. When producing modified asphalt based on natural asphalt, only the natural asphalt mixture needs to be called from the first finished product tank to replace other modifiers such as SBS.

[0019] The silo can be a rectangular or barrel-shaped structure made of stainless steel, with a capacity of 300 kg to 1 ton. The buffer tank can also be a barrel-shaped structure made of stainless steel, with a relatively small tank capacity of 1-5 tons, so as to make more compact use of the space in the existing workshop.

[0020] Figure 3 For Figure 2 the schematic structural principle diagram of the buffer tank in the middle, see Figure 3 As shown, the inlet 72 of the buffer tank is arranged at the upper part of the tank body and is connected to the third three-way valve 6 through a pipeline. The outlet 73 is arranged at the lower part of the tank body and is connected to the first three-way valve 4 through a pipeline. A spiral stirring blade 71 is arranged inside the tank body, which can ensure the mixing of the natural asphalt mixture and facilitate the flow of the natural asphalt mixture from top to bottom.

[0021] The preparation device of the modified asphalt based on natural asphalt provided by the present invention can, on the basis of existing production equipment, add a small number of three-way valves and pipelines, and only need to add two tanks with smaller sizes in the existing factory building to realize the production of the natural asphalt ingredient for replacing modifiers such as SBS, so as to further produce the modified asphalt based on natural asphalt, greatly saving the equipment cost and the raw material procurement cost.

[0022] Those skilled in the art should understand that although the present invention is described in the form of multiple embodiments, not every embodiment only contains an independent technical solution. Such narration in the specification is only for the sake of clarity. Those skilled in the art should understand the specification as a whole and consider the technical solutions involved in each embodiment as a way that can be combined with each other to form different embodiments to understand the protection scope of the present invention.

[0023] The above are only the schematic specific embodiments of the present invention and are not intended to limit the scope of the present invention. Any equivalent changes, modifications and combinations made by those skilled in the art without departing from the concept and principle of the present invention shall fall within the protection scope of the present invention.

Claims

1. A device for preparing modified asphalt based on natural asphalt, comprising a colloid mill, wherein the inlet of the colloid mill is connected to a reserved pump through a pipeline, characterized in that: The reserved pump is connected to a first three-way valve through a pipeline, and the first three-way valve is connected to the silo and the buffer tank through pipelines respectively. The pipeline at the outlet of the colloid mill is sequentially connected to a second three-way valve and a third three-way valve, and the second three-way valve is connected to the first finished product tank through a pipeline, and the third three-way valve is connected to the buffer tank through a pipeline.

2. The device for preparing modified asphalt based on natural asphalt according to claim 1, characterized in that: The silo is a rectangular or barrel-shaped structure made of stainless steel, with a capacity of 300kg to 1 ton.

3. The device for preparing modified asphalt based on natural asphalt according to claim 1, characterized in that: The buffer tank has a capacity of 1-5 tons.

4. The device for preparing modified asphalt based on natural asphalt according to claim 3, characterized in that: The inlet of the buffer tank is arranged at the upper part of the tank body and connected to the third three-way valve through a pipeline. The outlet is arranged at the lower part of the tank body and connected to the first three-way valve through a pipeline. A spiral stirring blade is arranged in the tank body.

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