System for low-cost capacity-expanding production of modified asphalt by tubular heating furnace method

Abstract

The invention relates to the technical field of production of modified asphalt by a tubular heating furnace method, in particular to a system for low-cost expansion production of modified asphalt by a tubular heating furnace method. Comprising a reaction kettle, a horizontal reaction tank and a tubular furnace, an asphalt outlet at the bottom of the reaction kettle is connected with an inlet pipeline at the top of one side of the horizontal reaction tank, a submerged pump is arranged on the other side of the horizontal reaction tank, and the submerged pump is connected with an inlet pipeline of the tubular furnace; an outlet of the tubular furnace is connected with an inlet pipeline of the reaction kettle; a medium-temperature asphalt pipeline is merged into a pipeline for connecting the outlet of the tubular furnace and the inlet of the reaction kettle; and a gas phase outlet of the horizontal reaction tank is connected with a flash evaporation oil gas pipeline. Capacity expansion can be realized, and the cost is moderate.

Description

Technical Field

[0001] The present invention relates to the technical field of producing modified asphalt using a tubular heating furnace method, and in particular to a system for producing modified asphalt using a tubular heating furnace method with low cost and expanded capacity. Background Art

[0002] Coal tar processing generally produces approximately 50% to 60% asphalt, a major product of tar processing. Larger processing scales increase asphalt production. Modified asphalt is currently a major downstream product of asphalt, primarily used in the production of prebaked anodes, battery rods, and electrode binders in the aluminum electrolytic industry.

[0003] At present, the domestic production process of modified asphalt mostly adopts the thermal polycondensation method. The thermal polycondensation method can be divided into the kettle heating method and the tubular furnace heating method according to the heating method. The modified asphalt production process of the tubular furnace heating method uses medium-temperature asphalt as raw material, heats the asphalt through a tubular heating furnace, and then carries out the modification reaction in the reactor; depending on the requirements of the product, it can be normal pressure, pressurized or reduced pressure, the reaction can be carried out in two steps, or a modified asphalt product can be obtained after a one-step reaction.

[0004] If a two-furnace, two-kettle process is used, the reaction temperature and reaction time of each step are different, and the reaction objectives are also different. This can effectively control the production of α-component and β-component, and the product quality can be controlled. The single-furnace, single-kettle process also uses medium-temperature asphalt as raw material, heating the asphalt in a tubular heating furnace and then reacting it in the reactor, completing the reaction in a single step. However, the product quality control is not as flexible as the two-furnace, two-kettle process.

[0005] The modified asphalt production process of the tubular furnace heating method achieves the purpose of asphalt modification based on the residence time of the medium-temperature asphalt in the modified asphalt reactor and the reaction temperature. The residence time is provided by controlling the size of the reactor volume, and the reaction temperature is guaranteed by the tubular heating furnace. Therefore, there are three factors that improve the processing capacity of a single set of modified asphalt equipment: the volume of the reactor, the heating capacity of the tubular furnace, and the flow rate of the circulation pump. As the raw material processing capacity increases, the volume of the reactor must be increased accordingly to ensure that the residence time remains unchanged. To ensure the heat supply, the heating capacity of the tubular furnace must be increased, and the flow rate of the circulation pump must also be increased.

[0006] Generally, the design of modified asphalt equipment using the tubular furnace heating method has a certain amount of margin. The margin of the reactor volume and the flow rate of the circulation pump is about 20%, and the margin of the tubular heating furnace is 50-100%. After actual on-site calibration, the margin of the tubular heating furnace has indeed reached more than 50%, or even 100%. Therefore, the factors that restrict the improvement of the processing capacity of a single modified asphalt equipment are the volume of the reactor and the flow rate of the circulation pump. The problem of the circulation pump is easy to solve. Just replace it with a pump that meets the requirements. Increasing the volume of the reactor is the key to expanding the capacity of a single modified asphalt equipment.

[0007] Chinese patent publication CN119075856A discloses a "capacity expansion device and method for heating modified asphalt in a tubular furnace." By adding a horizontal reactor, the volume of the reactor in the entire production line is increased. The nitrogen backpressure in the reactor is used as power to circulate asphalt into the reactor. Furthermore, a circulating pump with increased flow ensures heat supply throughout the reaction, thereby increasing the production capacity of a single production line. While this method maintains the same process flow, it also requires the purchase of an expensive imported centrifugal pump with a double-end mechanical seal and an auxiliary oil station, resulting in high costs. Summary of the Invention

[0008] In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides a system for producing modified asphalt by expanding capacity at low cost using a tubular heating furnace method, which can achieve capacity expansion at a moderate cost.

[0009] In order to achieve the above object, the present invention adopts the following technical solutions:

[0010] A system for producing modified asphalt at low cost by expanding capacity using a tubular heating furnace method comprises a reactor, a horizontal reaction tank and a tubular furnace; an asphalt outlet at the bottom of the reactor is connected to an inlet pipe at the top of one side of the horizontal reaction tank; a submersible pump is provided on the other side of the horizontal reaction tank, and the submersible pump is connected to the inlet pipe of the tubular furnace; the outlet of the tubular furnace is connected to the inlet pipe of the reactor, and a medium-temperature asphalt pipeline is merged into the pipeline connecting the outlet of the tubular furnace and the inlet of the reactor; the gas phase outlet of the horizontal reaction tank is connected to a flash oil and gas pipeline.

[0011] Furthermore, the horizontal reaction tank has a top inlet for feeding on one side and an outlet for discharging on the other side. Multiple baffles are arranged inside the middle reaction tank, which separate the interior of the reaction tank into several liquid storage spaces. Each baffle is provided with a full flow pipe.

[0012] The horizontal reaction tank is fed on one side and discharged on the other side. The middle baffle restricts the liquid storage height of the material, and the full flow pipe restricts the full flow of the material to the bottom of the other space, realizing the orderly entry and exit of the material and ensuring the residence time of the material.

[0013] Furthermore, the asphalt outlet at the bottom of the reactor and the top inlet on one side of the horizontal reaction tank are both provided with flanges, which are connected to the pipeline through the flanges.

[0014] Furthermore, a weight regulating valve is provided on the pipe connecting the asphalt outlet at the bottom of the reactor and the top inlet on one side of the horizontal reaction tank, and the weight regulating valve is electrically connected to the weight recording and control instrument.

[0015] Furthermore, the kettle diameter on the discharge side of the horizontal reaction tank is reduced by 20% to 40%.

[0016] Furthermore, it also includes a centrifugal pump, which is connected in parallel with the submersible pump. A first gate valve is provided on the pipeline at the outlet of the submersible pump, and a second gate valve and a third gate valve are provided at both ends of the parallel pipeline respectively.

[0017] Furthermore, it also includes a liquid level regulating valve, which is arranged on a pipeline connecting the submersible pump and the inlet of the tubular furnace, and is electrically connected to a liquid level recording and control instrument.

[0018] The top outlet of the reactor is connected to a flash oil and gas pipeline.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The present invention is provided with a reactor, a horizontal reaction tank and a tubular furnace. The asphalt outlet at the bottom of the reactor is connected to the top inlet pipe on one side of the horizontal reaction tank. A submersible pump is provided on the other side of the horizontal reaction tank, and the submersible pump is connected to the inlet pipe of the tubular furnace.

[0021] To increase the reactor volume of the entire production line, this invention adds a horizontal reactor tank at the inlet of the tubular furnace's circulating heating pipeline. By maintaining a stable liquid level in the horizontal reactor tank, the circulating asphalt flow rate at its inlet and outlet is maintained. A new submersible pump at the end of the horizontal reactor tank delivers the circulating asphalt into the tubular furnace for thermal circulation. As a circulating pump for modified asphalt, the submersible pump reduces the need for high-pressure pump shaft seals and can replace high-end centrifugal pumps. This invention not only achieves capacity expansion but also maintains a moderate cost.

[0022] 2. The horizontal reaction tank of the present invention is internally provided with baffles and full flow pipes. The baffles separate the reactor into several liquid storage spaces. Each baffle is provided with a full flow pipe. The material is fed on one side of the horizontal reaction tank and discharged on the other side. The middle baffle can restrict the liquid storage height of the material, and the full flow pipe restricts the material to flow to the bottom of another space, which can realize the orderly entry and exit of the material and ensure that all asphalt raw materials can have the same sufficient residence time.

[0023] 3. The asphalt outlet at the bottom of the reactor and the top inlet on one side of the horizontal reactor are both flanged and connected to the pipeline via flanges. The flange connection between the asphalt outlet and the horizontal reactor facilitates the replacement of larger inlets and outlets and pipelines to meet capacity expansion needs.

[0024] 4. A weight regulating valve is installed on the pipeline connecting the asphalt outlet at the bottom of the reactor to the top inlet on one side of the horizontal reactor. The weight regulating valve is electrically connected to a weight recording and control instrument. The amount of modified asphalt discharged controls the liquid level in the horizontal reactor, thereby maintaining a stable asphalt flow rate circulating at the inlet and outlet of the horizontal reactor.

[0025] 5. On the discharge side of the modified asphalt reaction tank of the present invention, the kettle diameter is reduced by about one third, which can reduce the insertion depth of the submersible pump, improve the stability of the submersible pump operation, and reduce costs.

[0026] 6. The present invention also includes a centrifugal pump connected in parallel with a submersible pump. A first gate valve is provided on the pipeline at the submersible pump outlet, and a second gate valve and a third gate valve are provided at each end of the parallel pipeline. The centrifugal pump can serve as a backup pump. When the submersible pump needs repair or replacement, it can be used to return to its pre-expansion processing capacity.

[0027] 7. The reactor of the present invention is provided with an outlet at the top, which is connected to the flash oil and gas pipeline. The flash oil and gas (including cracked gas) at the top of the horizontal reactor are combined with the flash oil and gas in the reactor and sent to the condenser cooler. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure and process principle of the present invention.

[0029] Markings in the figure: 1. Reactor; 2. Horizontal reaction tank; 3. Tubular furnace; 4. Submersible pump; 5. Centrifugal pump; 6. Baffle; 7. Full flow pipe; 8. Weight regulating valve; 9. Liquid level regulating valve; 10. First gate valve; 11. Second gate valve; 12. Third gate valve; 13. Asphalt outlet; 14. Modified asphalt pipeline; 15. Medium-temperature asphalt pipeline; 16. Flash oil and gas pipeline; LRC, liquid level recording and control instrument; WRC, weight recording and control instrument. DETAILED DESCRIPTION

[0030] The embodiments of the present invention are described in detail below. In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0032] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediary, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0033] In the description of the present invention, it should be noted that the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0034] Unless otherwise specifically stated, the relative arrangement of the parts and steps, the numerical expressions and the numerical values set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values should be interpreted as being merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0035] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0036] like Figure 1 As shown, a system for producing modified asphalt by expanding the capacity at low cost using a tubular heating furnace method includes a reactor 1, a horizontal reaction tank 2 and a tubular furnace 3.

[0037] In order to increase the volume of the reactor of the entire production line, the present invention adds a horizontal reaction tank 2 at the inlet of the tubular furnace circulating heating pipeline. The horizontal reaction tank 2 is a horizontal tank body, with the left side as the feed side and the right side as the discharge side. An inlet is provided at the top of the left side, and the inlet extends into the bottom of the tank body. The submersible pump 4 is arranged inside the right side, and the diameter of the right kettle is reduced by about one third, which can reduce the insertion depth of the submersible pump 4, improve the stability of the operation of the submersible pump 4, and also reduce costs. The present invention adopts the submersible pump 4 as a modified asphalt circulation pump, which can reduce the dependence on the high requirements for pump shaft sealing and realize the replacement of high-end centrifugal pumps. The present invention not only achieves capacity expansion, but also has a moderate cost.

[0038] A baffle 6 and a full flow pipe 7 are set inside the reaction tank between the inlet of the horizontal reaction tank and the hydraulic pump 4. Multiple baffles isolate the interior of the horizontal reaction tank 2 into several liquid storage spaces. Each baffle 6 is provided with a full flow pipe 7. The material is fed on the left side of the horizontal reaction tank and discharged on the right side. The middle baffle 6 can restrict the liquid storage height of the material, and the full flow pipe 7 restricts the material to flow to the bottom of another space, which can realize the orderly entry and exit of the material and ensure that all asphalt raw materials can have the same sufficient residence time.

[0039] The top outlet of reactor 1 is connected to a flash oil and gas pipeline 16. The bottom asphalt outlet 13 of reactor 1 is connected to the top inlet on the left side of horizontal reactor 2 via a pipeline. A weight regulating valve 8 is installed on this connecting pipeline. This weight regulating valve 8 is electrically connected to the weight recording and control instrument WRC, and they are interlocked. The level of the horizontal reactor is controlled by the amount of modified asphalt discharged, thereby maintaining a stable asphalt flow rate at the inlet and outlet of the horizontal reactor.

[0040] The asphalt outlet 13 at the bottom of the reactor and the top inlet on the left side of the horizontal reactor are both equipped with flanges, which are connected to the pipeline through flanges. This makes it easy to replace larger inlets and outlets and pipelines to meet the needs of capacity expansion.

[0041] The gas phase outlet at the top of the horizontal reaction tank 2 is connected to the flash oil and gas pipeline 16, and the top outlet of the reactor 1 is connected to the flash oil and gas pipeline 16. The flash oil and gas (including cracked gas) at the top of the horizontal reaction tank is combined with the flash oil and gas in the reactor and sent to the condenser cooler.

[0042] The submersible pump 4 is connected to the inlet of the tubular furnace 3 through the modified asphalt pipeline 14. The liquid level regulating valve 9 is arranged on the modified asphalt pipeline 14. The liquid level regulating valve 9 is electrically connected to the liquid level recording and control instrument LRC.

[0043] Centrifugal pump 5 is connected in parallel with submersible pump 4. A first gate valve 10 is installed on the modified asphalt pipeline 14 at the outlet of submersible pump 4. One end of the parallel pipeline is connected to the bottom of the horizontal reaction tank 2, where a second gate valve 11 is installed. The other end of the parallel pipeline is connected to the modified asphalt pipeline 14, where a third gate valve 12 is installed. Centrifugal pump 5 serves as a backup pump. When submersible pump 4 needs repair or replacement, it can be used to return to its pre-expansion processing capacity.

[0044] The outlet of the tubular furnace 3 is connected to the upper inlet pipe of the reactor 1 , and the medium-temperature asphalt pipeline 15 is merged into the pipeline connecting the outlet of the tubular furnace 3 and the upper inlet of the reactor 1 .

[0045] Taking the single furnace and single kettle process as an example, the working principle and working process of the present invention are as follows:

[0046] 1. The medium-temperature asphalt raw material is first mixed with the asphalt at the outlet of the tubular furnace 3 and enters the reactor 1 together for the modification reaction. The temperature in the reactor 1 is controlled at about 390°C.

[0047] 2. The gas and flash oil vapor produced by the cracking reaction in reactor 1 are sent to the condenser cooler through the flash oil and gas pipeline 16. The asphalt after the reforming reaction is discharged from the bottom asphalt outlet 13 and flows into the horizontal reaction tank 2 by gravity to continue the reforming reaction. The weight recording and control instrument WRC measures the weight of the material in reactor 1 and controls the weight regulating valve 8 to control the flow rate of the asphalt sent out by maintaining the weight of reactor 1 stable.

[0048] 3. The oil and gas produced by cracking in the horizontal reactor 2 are discharged through the gas phase outlet at the top of the reactor and merged into the flash oil and gas pipeline 16. The material enters the bottom of one side of the feed end of the horizontal reactor 2, flows through the full flow pipe 7 on the top of the baffle 6, and flows to the bottom of the other side of the baffle. After several rounds of this process, it reaches the discharge end.

[0049] 5. Modified asphalt is extracted from the bottom of the reactor by hydraulic pump 4, equivalent to 9 times the medium-temperature asphalt feed volume. It is then sent to tubular furnace 3 for heating and then circulated back to reactor 1 to heat the newly mixed medium-temperature asphalt for modification. A small amount of modified asphalt, equivalent to the medium-temperature asphalt feed volume, is produced. The liquid level recording and regulating instrument LRC is interlocked with the liquid level regulating valve 9, and then sent to the falling film cooler through the liquid level regulating valve 9, and finally to the modified asphalt product storage tank.

[0050] 6. If the hydraulic pump 4 is under maintenance, close the first valve 10 and the second valve 11, open the third valve 12, and pump the modified asphalt from the bottom through the centrifugal pump 5 and send it to the tubular furnace 3 for heating.

[0051] The horizontal reactor tank 2 of the present invention is installed on the ground, making it easy to locate and reducing implementation difficulty and cost. The newly added submersible pump 4 serves as the modified asphalt circulation pump, eliminating the need for a double-end mechanical seal and expensive imported centrifugal pumps in an auxiliary oil station, thus saving costs. This invention enables capacity expansion at a moderate cost.

[0052] The above description is only part of the specific implementation methods of the present invention, and the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the protection scope of the present invention.

Claims

1. A system for producing modified asphalt using a tubular heating furnace at low cost and with expanded capacity, characterized by: Including reactor, horizontal reaction tank and tubular furnace; The asphalt outlet at the bottom of the reactor is connected to the top inlet pipe on one side of the horizontal reaction tank. A submersible pump is provided on the other side of the horizontal reaction tank, and the submersible pump is connected to the inlet pipe of the tubular furnace. The outlet of the tubular furnace is connected to the inlet pipe of the reactor, and the medium-temperature asphalt pipeline is merged into the pipeline connecting the outlet of the tubular furnace and the inlet of the reactor; The gas phase outlet of the horizontal reaction tank is connected to the flash oil and gas pipeline.

2. The system for producing modified asphalt by low-cost expansion using a tubular heating furnace method according to claim 1, characterized in that: The horizontal reaction tank has a top inlet for feeding on one side and an outlet for discharging on the other side. A plurality of baffles are arranged inside the middle reaction tank, which separate the interior of the reaction tank into several liquid storage spaces. Each baffle is provided with a full flow pipe.

3. The system for producing modified asphalt by low-cost expansion using a tubular heating furnace method according to claim 1, characterized in that: The asphalt outlet at the bottom of the reactor and the top inlet on one side of the horizontal reaction tank are both provided with flanges, which are connected to the pipeline through the flanges.

4. The system for producing modified asphalt by low-cost expansion using a tubular heating furnace method according to claim 1, characterized in that: A weight regulating valve is provided on the pipeline connecting the asphalt outlet at the bottom of the reactor and the top inlet on one side of the horizontal reaction tank. The weight regulating valve is electrically connected to a weight recording and control instrument.

5. The system for producing modified asphalt by low-cost expansion using a tubular heating furnace method according to claim 1, characterized in that: On the discharge side of the horizontal reaction tank, the kettle diameter is reduced by 20% to 40%.

6. The system for producing modified asphalt by low-cost expansion using a tubular heating furnace method according to claim 1, characterized in that: It also includes a centrifugal pump, which is connected in parallel with a submersible pump. A first gate valve is provided on the pipeline at the outlet of the submersible pump, and a second gate valve and a third gate valve are provided at both ends of the parallel pipeline respectively.

7. The system for producing modified asphalt by low-cost expansion using a tubular heating furnace method according to claim 1, characterized in that: It also includes a liquid level regulating valve, which is arranged on a pipeline connecting the submersible pump and the inlet of the tubular furnace, and is electrically connected to a liquid level recording and control instrument.

8. The system for producing modified asphalt by low-cost expansion using a tubular heating furnace method according to claim 1, characterized in that: The top outlet of the reactor is connected to a flash oil and gas pipeline.

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