Modification system for tar distilled asphalt

Abstract

The utility model belongs to the technical field of asphalt modification, and particularly relates to a modification system for tar distillation asphalt, which comprises a tar distillation tower, a tubular furnace, a flash tower and a modified asphalt storage tank, and is additionally provided with an asphalt circulating tower, and the output end of the tar distillation tower is connected with the new material input end of the asphalt circulating tower; the liquid output end of the asphalt circulating tower is connected with the input end of the tubular furnace, the output end of the tubular furnace is respectively connected with the circulating material input end of the asphalt circulating tower and the input end of the flash tower, and the circulating material input end of the asphalt circulating tower and the input end of the flash tower are respectively provided with a stop valve. And the liquid output end of the flash tower is connected with the input end of the modified asphalt storage tank. According to the utility model, the asphalt circulating tower is additionally arranged, and the asphalt can be selectively conveyed into the asphalt circulating tower to be circularly heated or conveyed into the flash tower to be flashed by utilizing the stop valve on the tubular furnace, so that the quality of the modified asphalt is controllable.

Description

Technical Field

[0001] This utility model belongs to the field of asphalt modification technology, specifically relating to a modification system for tar distillation asphalt. Background Technology

[0002] Coal tar processing typically produces about 50% to 60% of medium-temperature asphalt, while modified asphalt is the main downstream product of medium-temperature asphalt.

[0003] Currently, the production method of modified asphalt generally involves first producing medium-temperature asphalt through tar distillation, and then heating the medium-temperature asphalt in a tubular furnace before it enters a flash tower. The liquid discharged from the bottom of the flash tower is the modified asphalt.

[0004] However, the modified asphalt produced by this method can only be formed in one step, and the production quality of the modified asphalt cannot be controlled. If the heating time is too short, the content of light oil impurities in the produced modified asphalt will be too high. If the heating time is too long, the produced modified asphalt will be too viscous and have poor fluidity. Utility Model Content

[0005] To address the problems existing in the prior art, this utility model provides a tar distillation pitch modification system. By adding an pitch circulation tower, the pitch can be selectively sent to the pitch circulation tower for circulating heating or sent to the flash tower for flash evaporation using the shut-off valve on the tubular furnace, thereby making the quality of the modified pitch controllable.

[0006] The specific technical solution adopted in this utility model is as follows:

[0007] A tar distillation pitch modification system includes a tar distillation tower, a tubular furnace, a flash distillation tower, and a modified pitch storage tank. An additional pitch circulation tower is also provided. The output end of the tar distillation tower is connected to the fresh feed input end of the pitch circulation tower. The liquid output end of the pitch circulation tower is connected to the input end of the tubular furnace. The output end of the tubular furnace is connected to both the circulating feed input end of the pitch circulation tower and the input end of the flash distillation tower. Both the circulating feed input end of the pitch circulation tower and the input end of the flash distillation tower are equipped with shut-off valves. The liquid output end of the flash distillation tower is connected to the input end of the modified pitch storage tank.

[0008] The gas output end of the asphalt circulation tower is also connected to an anthracene oil storage tank. An anthracene oil cooler is installed between the asphalt circulation tower and the anthracene oil storage tank. The gas output from the asphalt circulation tower is condensed by the anthracene oil cooler to form anthracene oil, which is then stored in the anthracene oil storage tank.

[0009] The anthracene oil cooler includes a primary anthracene oil cooler and a secondary anthracene oil cooler. An anthracene oil buffer tank is also provided between the anthracene oil cooler and the anthracene oil storage tank. The gas output end of the asphalt circulation tower, the primary anthracene oil cooler, the secondary anthracene oil cooler, the anthracene oil buffer tank, and the anthracene oil storage tank are connected end to end in sequence.

[0010] A retention tower is also provided between the tubular furnace and the flash tower. The output end of the tubular furnace is connected to the input end of the retention tower, the liquid output end of the retention tower is connected to the input end of the flash tower, and the gas output end of the retention tower is connected to the input end of the anthracene oil cooler.

[0011] The liquid output end of the flash tower is connected to the input end of the modified asphalt storage tank via a heat exchanger, and the gas output end of the flash tower is connected to the tail gas treatment system.

[0012] The beneficial effects of this utility model are:

[0013] 1. This utility model is equipped with an asphalt circulation tower. The asphalt at the bottom of the asphalt circulation tower is extracted by the bottom pump and heated by a tubular furnace. If the asphalt impurity content is detected to be too high, it is selected to return to the circulation tower for recirculation and heating until the light oil content and fluidity of the obtained asphalt are suitable. Then it is sent to the flash tower. Through this system, the quality of the modified asphalt can be controlled.

[0014] 2. This utility model is equipped with an anthracene oil recovery system, which condenses and recovers the anthracene oil gas discharged from the asphalt circulation tower and retention tower through an anthracene oil cooler, making it a by-product and improving economic efficiency. Attached Figure Description

[0015] Figure 1 This is a process flow diagram of the present invention. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0017] Specific embodiments, such as Figure 1 As shown, this utility model provides a tar distillation pitch modification system, including a tar distillation tower, a tubular furnace, a flash distillation tower, and a modified pitch storage tank, and also includes an pitch circulation tower. The output end of the tar distillation tower is connected to the fresh feed input end of the pitch circulation tower, the liquid output end of the pitch circulation tower is connected to the input end of the tubular furnace, the output end of the tubular furnace is connected to the circulating feed input end of the pitch circulation tower and the input end of the flash distillation tower, respectively, and the circulating feed input end of the pitch circulation tower and the input end of the flash distillation tower are respectively equipped with shut-off valves, and the liquid output end of the flash distillation tower is connected to the input end of the modified pitch storage tank.

[0018] Currently, the general method for producing modified asphalt involves first producing medium-temperature asphalt through tar distillation, then heating the medium-temperature asphalt in a tubular furnace before it enters a flash tower. The liquid discharged from the bottom of the flash tower is the modified asphalt. However, this method only allows for one-time molding of the modified asphalt, making it impossible to control its quality. If the heating time is too short, the produced modified asphalt will have an excessively high impurity content; if the heating time is too long, the produced modified asphalt will be too viscous and have poor fluidity.

[0019] Therefore, this utility model is equipped with an asphalt circulation tower. The asphalt can be selectively sent to the asphalt circulation tower for circulation heating or sent to the flash tower for flash evaporation through the shut-off valve on the tubular furnace, so that the quality of the modified asphalt can be controlled.

[0020] The soft asphalt from the bottom of the tar distillation tower enters the asphalt circulation tower, which operates under reduced pressure. The pressure at the top of the tower is about 95 kPa and the temperature at the top is 373°C. The asphalt from the bottom of the circulation tower is extracted by the bottom pump and heated to 385°C in a tubular furnace. If the asphalt impurity content is detected to be too high at this point, it is returned to the circulation tower for reheating until the light oil content and fluidity of the obtained asphalt are suitable. Then it is sent to the flash distillation tower.

[0021] The gas output end of the asphalt circulation tower is also connected to an anthracene oil storage tank. An anthracene oil cooler is installed between the asphalt circulation tower and the anthracene oil storage tank. The gas output from the asphalt circulation tower is condensed by the anthracene oil cooler to form anthracene oil, which is then stored in the anthracene oil storage tank.

[0022] The anthracene oil cooler includes a primary anthracene oil cooler and a secondary anthracene oil cooler. An anthracene oil buffer tank is also provided between the anthracene oil cooler and the anthracene oil storage tank. The gas output end of the asphalt circulation tower, the primary anthracene oil cooler, the secondary anthracene oil cooler, the anthracene oil buffer tank, and the anthracene oil storage tank are connected end to end in sequence.

[0023] The anthracene oil primary cooler is an anhydrous tar / asphalt tower oil-gas heat exchanger. The anthracene oil distilled from the top of the asphalt circulation tower is cooled to 260°C in the primary cooler, then cooled to 80°C by warm water in the secondary cooler, and subsequently enters the anthracene oil buffer tank, and is pumped to the anthracene oil storage tank in the product tank area. This system can recover anthracene oil and produce it as a by-product, improving economic efficiency.

[0024] A retention tower is also provided between the tubular furnace and the flash tower. The output end of the tubular furnace is connected to the input end of the retention tower, the liquid output end of the retention tower is connected to the input end of the flash tower, and the gas output end of the retention tower is connected to the input end of the anthracene oil cooler.

[0025] The retention tower is used to hold asphalt at a certain temperature for more than 8 hours, allowing it to undergo a condensation reaction. The quality of the modified asphalt is improved by adjusting the softening point and T1 by regulating the liquid level. The top temperature of the retention tower is 385℃. The retention tower and the asphalt circulation tower share a set of coolers. The anthracene oil at the top of the retention tower is cooled by the anthracene oil cooler before entering the anthracene oil storage tank in the product tank area. The bottom temperature of the retention tower is 385℃, and the asphalt is extracted by the bottom pump and sent to the flash tower.

[0026] The liquid output end of the flash tower is connected to the input end of the modified asphalt storage tank via a heat exchanger, and the gas output end of the flash tower is connected to the tail gas treatment system.

[0027] The heat exchanger is a heat transfer oil / modified asphalt heat exchanger. The bottom pressure of the flash tower is 60 kPa and the temperature is 376℃. The modified asphalt is pumped out from the bottom of the flash tower, cooled by the heat exchanger, and then sent to the modified asphalt storage tank in the asphalt tank area.

[0028] The exhaust gas treatment system includes a purification tower and a tubular incinerator. The non-condensable gas from the top of the flash tower is sent to the wash oil purification tower for purification before entering the tubular incinerator for incineration.

Claims

1. A system for upgrading tar distillation pitch comprising a tar distillation column, a tubular furnace, a flash column, and an upgraded pitch storage tank, characterized in that, The tar distillation tower is connected with the new material input end of the asphalt circulation tower, the liquid output end of the asphalt circulation tower is connected with the input end of the tubular furnace, the output end of the tubular furnace is connected with the circulating material input end of the asphalt circulation tower and the input end of the flash tower respectively, the circulating material input end of the asphalt circulation tower and the input end of the flash tower are respectively provided with a stop valve, and the liquid output end of the flash tower is connected with the input end of the modified asphalt storage tank.

2. A system for upgrading tar distillation pitch according to claim 1, characterized in that, The gas output end of the asphalt circulation tower is also connected with an anthracene oil storage tank, an anthracene oil cooler is arranged between the asphalt circulation tower and the anthracene oil storage tank, and the gas output by the asphalt circulation tower is condensed into anthracene oil by the anthracene oil cooler and stored in the anthracene oil storage tank.

3. A system for upgrading a tar distillation pitch according to claim 2, characterized in that, The anthracene oil cooler comprises an anthracene oil primary cooler and an anthracene oil secondary cooler, an anthracene oil buffer tank is further arranged between the anthracene oil cooler and the anthracene oil storage tank, and the gas output end of the asphalt circulation tower, the anthracene oil primary cooler, the anthracene oil secondary cooler, the anthracene oil buffer tank and the anthracene oil storage tank are sequentially and circularly connected.

4. A system for upgrading tar distillation pitch according to claim 2, characterized in that, A residence tower is further arranged between the tubular furnace and the flash tower, the output end of the tubular furnace is connected with the input end of the residence tower, the liquid output end of the residence tower is connected with the input end of the flash tower, and the gas output end of the residence tower is connected with the input end of the anthracene oil cooler.

5. A system for upgrading tar distillation pitch according to claim 1, characterized in that, The liquid output end of the flash tower is connected with the input end of the modified asphalt storage tank by means of a heat exchanger, and the gas output end of the flash tower is connected with a tail gas treatment system.

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