Device for producing modified pitch through one-time heating and flash evaporation

Abstract

The utility model discloses a device for producing modified pitch through primary heating and flash evaporation. The device comprises a modified pitch heating furnace, a reactor, a flash evaporation oil cooler, a vacuum cooler, a vacuum unit, a flash evaporation tower, a modified pitch pump, an extraction pump, a large finished product tank and a flash evaporation oil tank, the modified asphalt heating furnace is connected with the reactor, so that high-temperature asphalt heated by the modified asphalt heating furnace enters the reactor, the reactor is connected with the flash tower through the extraction pump, and the high-temperature asphalt reacted by the reactor is pumped into the flash tower through the extraction pump; oil gas generated at the upper part of the reactor is cooled by a flash oil cooler and then enters a flash oil tank, and the flash tower is connected to a large finished product tank through the modified pitch pump; oil gas generated at the upper part of the flash tower enters the flash oil tank after passing through the vacuum cooler, and non-condensable gas enters the vacuum unit; the equipment is long in production period, high in product quality and simple in process.

Description

Technical Field

[0001] The utility model relates to a device for producing modified asphalt by one-time heating and flash evaporation. Background Art

[0002] In the process of coal tar processing, about 50% to 60% of asphalt is generally produced, which is a major product of tar processing. The larger the processing scale, the more asphalt is produced. Modified asphalt is currently the main downstream product of asphalt, mainly used in the production of prebaked anodes in the electrolytic aluminum industry, and the preparation of battery rods or electrode binders. At present, there are two main methods for producing modified asphalt: thermal polycondensation and vacuum flash evaporation.

[0003] Patent 201510362891.X discloses a method for producing medium-temperature modified asphalt by low-temperature and low-pressure continuous circulation. Under low temperature and pressure, sufficient polymerization time is provided, and thermal polymerization is carried out by forced circulation with a large flow rate through a heating furnace, which avoids the tendency of excessive polymerization of medium-temperature asphalt to generate secondary QI, and minimizes the risk of pipeline coking and blockage. The production cycle can reach 6 months to one year. However, the reaction temperature is too low, and the asphalt quality is poor.

[0004] Patent 201710467653.4 discloses a modified asphalt production device, wherein the asphalt inlet of the flash tower at the top of the flash modification reactor is connected to the raw asphalt delivery pipeline, and the oil and gas production outlet of the flash tower is connected to the oil and gas condensation cooler; the asphalt outlet of the lower reactor is connected to the furnace tube inlet of the tubular heating furnace 1, and the furnace tube outlet of the tubular heating furnace 1 is connected to the asphalt inlet of the secondary modification reactor; the asphalt outlet of the secondary modification reactor is connected to the asphalt delivery pipeline 1 upstream of the tubular heating furnace 1, and the asphalt inlet of the fractionation tower is connected to the other; the oil and gas production outlet of the secondary modification reactor is connected to the oil and gas inlet of the lower part of the fractionation tower; the oil and gas production outlet of the fractionation tower is connected to the oil and gas condensation cooler, and the modified asphalt production outlet of the fractionation tower is connected to the modified asphalt delivery pipeline. The double-kettle two-step reaction method can effectively control the amount of α-component and β-component generated, and the product quality is controllable; but there are more equipment, longer process, and high energy consumption. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a device for producing modified asphalt by flash evaporation with one-time heating, which has long production cycle, excellent product quality and simple process.

[0006] The utility model is realized by the following technical solutions:

[0007] A device for producing modified asphalt by one-time heating and flash evaporation, comprising a modified asphalt heating furnace, a reactor, a flash oil cooler, a vacuum cooler, a vacuum unit, a flash tower, a modified asphalt pump, an extraction pump, a finished product tank and a flash oil tank; the modified asphalt heating furnace is connected to the reactor so that the high-temperature asphalt heated by the modified asphalt heating furnace enters the reactor, the reactor is connected to the flash tower via the extraction pump, the high-temperature asphalt after the reaction in the reactor is pumped into the flash tower via the extraction pump, the oil and gas generated at the top of the reactor enters the flash oil tank after being cooled by the flash oil cooler, and the flash tower is connected to the finished product tank via the modified asphalt pump; the oil and gas generated at the top of the flash tower enters the flash oil tank after passing through the vacuum cooler, and the non-condensable gas enters the vacuum unit.

[0008] Preferably, a stirring device is installed at the axis of the reactor.

[0009] Preferably, the vacuum pressure of the flash tower is controlled at 60-70 KPa.

[0010] Preferably, the heating temperature of the modified asphalt heating furnace is 385-390°C.

[0011] Preferably, the stirring device includes a water cooling device installed at the axis center of the top of the reactor, and a reduction motor installed at the top of the water cooling device. A transmission shaft is installed at the axis center of the water cooling device, the upper end of the transmission shaft is connected to the reduction motor, and the lower end of the transmission shaft is detachably mounted with a stirring shaft. A material distribution cover is arranged on the shaft body of the stirring shaft, the height of the material distribution cover is lower than the feed height of the reactor, the diameter of the material distribution cover is smaller than the inner diameter of the reactor, and a spiral sheet is arranged on the shaft body of the stirring shaft below the material distribution cover.

[0012] Preferably, the distribution hood is conical, and its diameter gradually increases downwards, and the bottom diameter of the distribution hood is smaller than the inner diameter of the reactor.

[0013] Preferably, a plurality of stirring rods are arranged in an annular manner at the bottom edge of the material distribution cover, and the ends of the stirring rods away from the material distribution cover are arranged obliquely outwards.

[0014] Preferably, the water cooling device includes a water cooling bin, which is detachably mounted at the top axis of the reactor, the transmission shaft passes through the water cooling bin, bearings and shaft seals are provided between the transmission shaft and the water cooling bin, the shaft seals are sealed on the inner side of the bearings, a water inlet pipe and a water outlet pipe are provided on the outer wall of the water cooling bin, and a bracket is connected between the reduction motor and the water cooling bin.

[0015] Preferably, a heat shielding portion is provided on the outside of the water cooling bin, the heat shielding portion is connected to the inner cavity of the water cooling bin, the water inlet pipe is located below the heat shielding portion, and the water outlet pipe is located above the heat shielding portion.

[0016] The beneficial effects of the utility model are:

[0017] 1. The heating furnace uses medium-temperature asphalt to heat the feed once, which reduces the risk of coking and clogging of furnace tubes and pipelines. The production cycle can reach 10 months to 1 year.

[0018] 2. The softening point of modified asphalt is adjusted by flash evaporation to produce high quality products.

[0019] 3. The equipment has simple structure, simple process and is easy to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the structure of the utility model;

[0022] Figure 2 It is a structural schematic diagram of a stirring device;

[0023] Figure 3 This is a schematic diagram of the installation of the water cooling device. DETAILED DESCRIPTION

[0024] All features disclosed in this specification, or steps in all methods or processes disclosed, except mutually exclusive features and / or steps, can be combined in any manner.

[0025] Any feature disclosed in this specification (including any additional claims, abstract and drawings), unless otherwise stated, may be replaced by other equivalent or alternative features with similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0026] In the description of the present invention, it should be understood that the terms "one end", "the other end", "outside", "upper", "inside", "horizontal", "coaxial", "center", "end", "length", "outer end" and the like 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, and do not indicate or imply 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 a limitation on the present invention.

[0027] In addition, in the description of the present invention, “plurality” means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0028] In the present invention, unless otherwise clearly specified and limited, the terms "set", "socket", "connect", "penetrate", "plug in" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] like Figure 1 The device shown in the figure for producing modified asphalt by flash heating once comprises a modified asphalt heating furnace 1, a reactor 2, a flash oil cooler 3, a vacuum cooler 4, a vacuum unit 5, a flash tower 6, a modified asphalt pump 7, an extraction pump 8, a finished product tank 9 and a flash oil tank 10; the modified asphalt heating furnace 1 is connected to the reactor 2, so that the high-temperature asphalt heated by the modified asphalt heating furnace 1 enters the reactor 2, the reactor 2 is connected to the flash tower 6 through the extraction pump 8, the high-temperature asphalt after the reaction in the reactor 2 is pumped into the flash tower 6 through the extraction pump 8, the oil and gas generated at the top of the reactor 2 enters the flash oil tank 10 after being cooled by the flash oil cooler 3, and the flash tower 6 is connected to the finished product tank 9 through the modified asphalt pump 7; the oil and gas generated at the top of the flash tower 6 enters the flash oil tank 10 after passing through the vacuum cooler 4, and the non-condensable gas enters the vacuum unit 5.

[0030] See also Figure 1 As shown, a stirring device 11 is installed at the axis center of the reactor 2.

[0031] The stirring device 11 can allow the asphalt material to react evenly in the reactor 2 .

[0032] The vacuum pressure of flash tower 6 is controlled at 60-70Kpa.

[0033] The heating temperature of the modified asphalt heating furnace 1 is 385-390°C.

[0034] See also Figure 2 and Figure 3 The stirring device 11 shown includes a water cooling device 12 installed at the axis center of the top of the reactor, and a reduction motor 13 installed at the top of the water cooling device 12. A transmission shaft 14 is installed at the axis center of the water cooling device 11. The upper end of the transmission shaft 14 is connected to the reduction motor 13. The lower end of the transmission shaft 14 is detachably installed with a stirring shaft 15. A material distribution cover 16 is arranged on the shaft body of the stirring shaft 15. The height of the material distribution cover 16 is lower than the feeding height of the reactor 2. The diameter of the material distribution cover 16 is smaller than the inner diameter of the reactor 2. A spiral piece 17 is arranged on the shaft body of the stirring shaft 15 below the material distribution cover 16.

[0035] In the above technical solution, the asphalt material is lifted by the spiral blade 17, so that the asphalt material is turned up and down in the reactor, making the reaction more balanced.

[0036] The water cooling device 12 blocks high temperature and prevents the reduction motor 13 from overheating.

[0037] The distribution cover 16 is conical, and its diameter gradually increases downwards. The bottom diameter of the distribution cover 16 is smaller than the inner diameter of the reactor 2 .

[0038] See also Figure 2 As shown, a plurality of stirring rods 161 are arranged in a ring shape at the bottom edge of the material distribution cover 16 , and the ends of the stirring rods 161 away from the material distribution cover 16 are arranged obliquely outward.

[0039] After the asphalt is lifted by the spiral blade 17, the upper layer of the asphalt contacts the stirring rod 161 for stirring, so that the structure of the asphalt is more uniform.

[0040] See also Figure 3 As shown, the water cooling device 12 includes a water cooling bin 121, which is detachably installed at the top axis of the reactor 2, and the transmission shaft 14 passes through the water cooling bin 121. A bearing and a shaft seal are provided between the transmission shaft 14 and the water cooling bin 121, and the shaft seal is sealed on the inner side of the bearing. A water inlet pipe 131 and a water outlet pipe 141 are provided on the outer wall of the water cooling bin 121, and a bracket 151 is connected between the reduction motor 13 and the water cooling bin 121.

[0041] See also Figure 3As shown, a heat shielding portion 161 is provided on the outside of the water cooling bin 121 , and the heat shielding portion 161 is connected to the inner cavity of the water cooling bin 121 , the water inlet pipe 131 is located below the heat shielding portion 161 , and the water outlet pipe 141 is located above the heat shielding portion 161 .

[0042] In the above technical solution, a heat shielding portion 161 is used, which has a larger shielding area and can better avoid the high temperature of the reduction motor 13.

[0043] The implementation steps are as follows:

[0044] 1. The medium-temperature asphalt at the bottom of the vacuum tower is heated to 385-390°C in a modified asphalt heating furnace and then enters the reactor for polymerization reaction;

[0045] 2. The modified asphalt in the reactor is sent to the flash tower, and the softening point of the asphalt is adjusted by the vacuum at the top of the tower;

[0046] 3. The oil and gas produced at the top of the reaction are sent to the flash oil tank after condensation and cooling;

[0047] 4. The asphalt flue gas at the top of the reactor is introduced into the exhaust gas washer through the slight negative pressure formed by the Venturi tube, and then enters the heating furnace for incineration together with the waste gas discharged from the vacuum pump of the flash tower.

[0048] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that are not conceived through creative work should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope defined in the claims.

Claims

1. A device for producing modified asphalt by one-step heating and flash evaporation, characterized in that: It includes a modified asphalt heating furnace, a reactor, a flash oil cooler, a vacuum cooler, a vacuum unit, a flash tower, a modified asphalt pump, an extraction pump, a finished product tank and a flash oil tank; the modified asphalt heating furnace is connected to the reactor, the reactor is connected to the flash tower through the extraction pump, the high-temperature asphalt after the reaction in the reactor is pumped into the flash tower through the extraction pump, the oil and gas generated at the top of the reactor is cooled by the flash oil cooler and then enters the flash oil tank, the flash tower is connected to the finished product tank through the modified asphalt pump; the oil and gas generated at the top of the flash tower enters the flash oil tank after passing through the vacuum cooler, and the non-condensable gas enters the vacuum unit.

2. The device for producing modified asphalt by single heating flash evaporation according to claim 1, characterized in that: A stirring device is installed at the axis center of the reactor.

3. The device for producing modified asphalt by single heating flash evaporation according to claim 2, characterized in that: The stirring device includes a water cooling device installed at the axis center of the top of the reactor, and a reduction motor installed at the top of the water cooling device. A transmission shaft is installed at the axis center of the water cooling device, the upper end of the transmission shaft is connected to the reduction motor, and the lower end of the transmission shaft is detachably mounted with a stirring shaft. A material distribution cover is arranged on the shaft body of the stirring shaft. The height of the material distribution cover is lower than the feed height of the reactor, and the diameter of the material distribution cover is smaller than the inner diameter of the reactor. A spiral sheet is arranged on the shaft body of the stirring shaft below the material distribution cover.

4. The device for producing modified asphalt by single heating flash evaporation according to claim 3, characterized in that: The distribution hood is conical, and its diameter gradually increases downwards. The bottom diameter of the distribution hood is smaller than the inner diameter of the reactor.

5. The device for producing modified asphalt by single heating flash evaporation according to claim 4, characterized in that: A plurality of stirring rods are arranged in a ring shape at the bottom edge of the material distribution cover, and the ends of the stirring rods away from the material distribution cover are arranged obliquely outward.

6. The device for producing modified asphalt by single heating flash evaporation according to claim 3, characterized in that: The water cooling device includes a water cooling bin, which is detachably mounted on the top axis of the reactor. The transmission shaft passes through the water cooling bin. A bearing and a shaft seal are provided between the transmission shaft and the water cooling bin. The shaft seal is sealed on the inner side of the bearing. A water inlet pipe and a water outlet pipe are provided on the outer wall of the water cooling bin. A bracket is connected between the reduction motor and the water cooling bin.

7. The device for producing modified asphalt by single heating flash evaporation according to claim 6, characterized in that: A heat shielding part is arranged outside the water cooling bin, and the heat shielding part is connected to the inner cavity of the water cooling bin. The water inlet pipe is located below the heat shielding part, and the water outlet pipe is located above the heat shielding part.

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