CN112342048A - Tubular furnace heating method modified asphalt production system and cleaning process thereof - Google Patents
Tubular furnace heating method modified asphalt production system and cleaning process thereof Download PDFInfo
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- CN112342048A CN112342048A CN202011348611.7A CN202011348611A CN112342048A CN 112342048 A CN112342048 A CN 112342048A CN 202011348611 A CN202011348611 A CN 202011348611A CN 112342048 A CN112342048 A CN 112342048A
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- asphalt
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10C—WORKING-UP PITCH, ASPHALT, BITUMEN, TAR; PYROLIGNEOUS ACID
- C10C3/00—Working-up pitch, asphalt, bitumen
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/08—Cleaning containers, e.g. tanks
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10C—WORKING-UP PITCH, ASPHALT, BITUMEN, TAR; PYROLIGNEOUS ACID
- C10C3/00—Working-up pitch, asphalt, bitumen
- C10C3/02—Working-up pitch, asphalt, bitumen by chemical means reaction
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10C—WORKING-UP PITCH, ASPHALT, BITUMEN, TAR; PYROLIGNEOUS ACID
- C10C3/00—Working-up pitch, asphalt, bitumen
- C10C3/06—Working-up pitch, asphalt, bitumen by distillation
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- Working-Up Tar And Pitch (AREA)
Abstract
The invention relates to a tubular furnace heating method modified asphalt production system and a cleaning process thereof, wherein the system comprises a double-furnace double-kettle modified asphalt production system and a tar circulating cleaning system; the No. 1 reaction kettle, the No. 1 tubular furnace and the connecting pipeline system form a primary modification reaction unit, and the No. 2 reaction kettle, the No. 2 tubular furnace and the connecting pipeline system form a secondary modification reaction unit; the modifying tower, the falling film cooler and the connecting pipeline system form a modifying cooling unit; the tar circulating and cleaning system consists of a tar intermediate tank, a tar cleaning pipeline and a tar recovery pipeline, wherein the tar intermediate tank is respectively connected with the primary modification reaction unit, the secondary modification reaction unit and the modification cooling unit through the tar cleaning pipeline and the tar recovery pipeline to form a circulating and cleaning loop. The invention takes tar as a cleaning medium and utilizes the original modified asphalt circulating pump to clean the whole system; the problem of start-up and shutdown caused by asphalt residues in the system is effectively solved, and the cleaning process is simple and convenient to operate.
Description
Technical Field
The invention relates to the technical field of modified asphalt production, in particular to a tubular furnace heating modified asphalt production system and a cleaning process thereof.
Background
About 50 to 60 percent of medium temperature pitch is generally generated in the coal tar processing process, belongs to a bulk product of tar processing, and modified pitch is a main downstream product of the current medium temperature pitch and is mainly used for producing prebaked anodes, preparing battery rods or electrode binders in the electrolytic aluminum industry.
At present, the domestic modified asphalt production process mostly adopts a thermal polycondensation method, which can be divided into a kettle type heating method and a tube furnace heating method according to the heating mode. The modified asphalt production system by the tubular furnace heating method comprises a pressurized double-furnace double-kettle process introduced from France, a domestic normal-pressure or reduced-pressure double-furnace double-kettle process, a single-furnace single-kettle process and the like.
The double-furnace double-kettle process takes medium-temperature asphalt as a raw material, asphalt is heated by a tubular heating furnace, and then modification reaction is carried out in a reaction kettle; the modification reaction is divided into a first modification reaction and a second modification reaction, wherein the two modification reactions can be normal pressure reaction, pressurization reaction or decompression reaction according to different requirements of products, and the modified asphalt product is obtained after the two modification reactions are flashed by a modification tower and the retention time is delayed. The double-furnace double-kettle process has the advantages that two-step reaction is adopted, the reaction temperature and the reaction time of each step are different, the purpose of reaction is different, the generation amount of alpha-components and beta-components can be effectively controlled, and the product quality is controllable.
The single-furnace single-kettle process also takes medium-temperature asphalt as a raw material, asphalt is heated in a tubular heating furnace, then the reaction is carried out in a reaction kettle, and the modified asphalt is obtained by flash stripping in a stripping tower or a modifying tower after the reaction; because the reaction is completed in one step, the product quality control of the single-furnace single-kettle process is not flexible as the double-furnace double-kettle process.
The key equipment of the tubular furnace heating method modified asphalt production system is an asphalt circulating pump and a tubular furnace, and due to the characteristics of liquid asphalt (containing polymer and other solid suspended matters, the viscosity of the liquid is high and easy to solidify, and the softening point is as high as more than 105 ℃), the asphalt circulating pump and the furnace tube of the tubular furnace are easy to coke and block, and in addition, valves of asphalt pipelines, instrument connecting pipes, asphalt heat exchangers, heat exchange pipes of falling film coolers and the like are easy to block. Particularly, after the system is shut down, only by steam or nitrogen purging, certain amount of asphalt residues exist at each corner of equipment and pipelines, which cause great trouble to the restart of the whole system, particularly have great influence on key equipment such as an asphalt circulating pump, a tube furnace and the like, and cause difficult restart of the asphalt circulating pump and coking and blockage of furnace tubes of the tube furnace.
Disclosure of Invention
The invention provides a tubular furnace heating method modified asphalt production system and a cleaning process thereof, wherein a tar intermediate tank and a matched pipeline are additionally arranged, tar is used as a cleaning medium, and an original modified asphalt circulating pump of the system is utilized to clean the whole system; the problem of start-up and shutdown caused by asphalt residues in the system is effectively solved, and the cleaning process is simple and convenient to operate.
In order to achieve the purpose, the invention adopts the following technical scheme:
a tubular furnace heating method modified asphalt production system comprises a double-furnace double-kettle modified asphalt production system consisting of a 1# reaction kettle, a 1# tubular furnace, a 2# reaction kettle, a 2# tubular furnace, a modifying tower and a falling film cooler; wherein the 1# reaction kettle, the 1# tubular furnace and the connecting pipeline system form a primary modification reaction unit, and the 2# reaction kettle, the 2# tubular furnace and the connecting pipeline system form a secondary modification reaction unit; the modifying tower, the falling film cooler and the connecting pipeline system form a modifying cooling unit; the device also comprises a tar circulating cleaning system; the tar circulating and cleaning system consists of a tar intermediate tank, a tar cleaning pipeline and a tar recovery pipeline, wherein the tar intermediate tank is respectively connected with the primary modification reaction unit, the secondary modification reaction unit and the modification cooling unit through the tar cleaning pipeline and the tar recovery pipeline to form a circulating and cleaning loop.
The upper part of the No. 1 reaction kettle is provided with a first heated asphalt inlet, the top of the reaction kettle is provided with a first flash evaporation oil gas outlet, and the bottom of the reaction kettle is provided with a first asphalt outlet; the first asphalt outlet is connected with the inlet of the No. 1 tube furnace through a first asphalt circulating pipeline, and the first asphalt circulating pipeline is provided with a No. 1 modified asphalt circulating pump; the first heating asphalt inlet is connected with the outlet of the No. 1 tube furnace through a first heating circulation pipeline, and a medium temperature asphalt inlet arranged on the first heating asphalt circulation pipeline is connected with a medium temperature asphalt pipeline;
the upper part of the No. 2 reaction kettle is provided with a second heated asphalt inlet, the top of the reaction kettle is provided with a second flash evaporation oil gas outlet, and the bottom of the reaction kettle is provided with a second asphalt outlet; the asphalt outlet II is connected with the inlet of the No. 2 tube furnace through an asphalt circulating pipeline II, a No. 2 modified asphalt circulating pump and a jet mixer are sequentially arranged on the asphalt circulating pipeline II along the asphalt flowing direction, and the jet mixer is connected with the asphalt circulating pipeline I through an asphalt connecting pipeline I; the second heating asphalt inlet is connected with the outlet of the No. 2 tube furnace through a second heating circulating pipeline;
an asphalt inlet is formed in one side of the upper part of the upgrading tower, a circulating asphalt inlet is formed in the other side of the upper part of the upgrading tower, a flash evaporation oil gas outlet III is formed in the top of the upgrading tower, and a modified asphalt outlet is formed in the bottom of the upgrading tower; the asphalt inlet is connected with an asphalt circulating pipeline II at the upstream of the jet mixer through an asphalt connecting pipeline II; the modified asphalt outlet is connected with the circulating asphalt inlet through a modified asphalt circulating pipeline; the modified asphalt circulating pipeline is provided with a modified tower asphalt circulating pump;
one side of the upper part of the falling film cooler is provided with a modified asphalt inlet, the other side of the upper part of the falling film cooler is provided with a water vapor outlet, the other side of the lower part of the falling film cooler is provided with a steam condensate inlet, and the bottom of the falling film cooler is provided with a modified asphalt outlet after heat exchange; the modified asphalt inlet is connected with a modified asphalt circulating pipeline through a modified asphalt inlet pipeline, and an asphalt heat exchanger is arranged on the modified asphalt inlet pipeline; the steam outlet is connected with the steam condensate inlet through a steam pipeline, and a steam condenser, a condensate water tank and a condensate water pump are sequentially arranged on the steam pipeline in the steam flowing direction; the modified asphalt outlet after heat exchange is connected with a modified asphalt outlet pipeline, and an asphalt feeding pump is arranged on the modified asphalt outlet pipeline;
the top of the tar intermediate tank is provided with a tar inlet and a waste tar inlet, and the lower part of the tar intermediate tank is provided with a tar outlet; the tar inlet is connected with a tar conveying pipeline; the tar outlet is respectively connected with an asphalt circulating pipeline I, an asphalt circulating pipeline II, a modified asphalt circulating pipeline and a modified asphalt outlet pipeline through a tar cleaning pipeline; the waste tar inlet is respectively connected with an asphalt circulating pipeline I, an asphalt circulating pipeline II and a modified asphalt outlet pipeline through a tar recovery pipeline; the waste tar inlet pipeline is additionally connected with a tar oil depot through a waste tar pipeline.
A first valve is arranged at one asphalt outlet of the No. 1 reaction kettle; a second valve is arranged at the upstream of the connection position of the first asphalt circulating pipeline and the first asphalt connecting pipeline; a third valve is arranged at the second asphalt outlet of the 2# reaction kettle; a fourth valve is arranged at the upstream of the joint of the second asphalt circulating pipeline and the second asphalt connecting pipeline; a fifth valve is arranged at the modified asphalt outlet of the modifying tower; a sixth valve is arranged at the downstream of the joint of the modified asphalt circulating pipeline and the modified asphalt inlet pipeline; a seventh valve is arranged at the downstream of the asphalt feeding pump of the modified asphalt outlet pipeline; a valve eighth is arranged at one position of the tar cleaning pipeline, which is close to the asphalt circulating pipeline; a ninth valve is arranged at a position, close to the asphalt circulating pipeline, of the tar recovery pipeline; a tenth valve is arranged at a position, close to the second asphalt circulating pipeline, of the tar cleaning pipeline; a valve eleven is arranged at a position, close to the asphalt circulating pipeline II, of the tar recovery pipeline; a valve twelve is arranged at the position of the tar cleaning pipeline close to the modified asphalt circulating pipeline; and a thirteen valve is arranged at the position of the tar recovery pipeline close to the modified asphalt outlet pipeline.
A first weight recording control instrument is arranged on the No. 1 reaction kettle, a first weight recording adjusting valve is arranged on the first asphalt connecting pipeline, and the first weight recording control instrument and the first weight recording adjusting valve are controlled in an interlocking mode.
And a second weight recording control instrument is arranged on the No. 2 reaction kettle, a second weight recording adjusting valve is arranged on the second asphalt connecting pipeline, and the second weight recording control instrument and the second weight recording adjusting valve are subjected to dual lock control.
And a third weight recording control instrument is arranged on the modified tower, a third weight recording adjusting valve is arranged on the modified asphalt inlet pipeline, and the third weight recording control instrument and the third weight recording adjusting valve are controlled in a triple lock mode.
The falling film cooler is provided with a liquid level recording and adjusting instrument at the position corresponding to the asphalt storage tank at the lower part of the falling film cooler, and the liquid level recording and adjusting instrument and the asphalt feeding pump are controlled in an interlocking manner.
The cleaning process of the tubular furnace heating method modified asphalt production system comprises the following steps:
1) the primary modification reaction unit is shut down and cleaned;
stopping the 1# tubular furnace, and emptying all the asphalt in the primary modification reaction unit into the secondary modification reaction unit through an asphalt connecting pipeline I; immediately cleaning the primary modification reaction unit while the waste heat is still; before cleaning, the first valve, the second valve, the first weight recording regulating valve, the eighth valve and the ninth valve are in a closed state; when cleaning, opening a valve eight and a valve two, starting a 1# modified asphalt circulating pump, injecting tar stored in a tar intermediate tank into a 1# reaction kettle, closing the valve eight when a weight recording and adjusting instrument I displays that the liquid level in the 1# reaction kettle reaches a set value, and opening the valve one to form closed circulation among the 1# reaction kettle, the 1# modified asphalt circulating pump and the 1# tubular furnace; cleaning a No. 1 modified asphalt circulating pump and a No. 1 tubular furnace tube by using tar as a cleaning medium, and cleaning all equipment and pipelines of a primary modification reaction unit; after the cyclic cleaning is carried out for 1-2 hours, opening a valve II, closing a valve II, sending the tar in the primary modification reaction unit back to the tar intermediate tank, closing the valve II when the weight recording and adjusting instrument I shows that the tar amount in the reaction kettle 1 is zero, stopping the modified asphalt circulating pump 1, and blowing the residual tar back to the tar intermediate tank through a blowing pipe;
2) stopping and cleaning the secondary modification reaction unit;
stopping the 2# tubular furnace, and completely emptying the asphalt in the secondary modification reaction unit to the modification tower; immediately cleaning the second-step modification reaction unit while the waste heat is still; before cleaning, the third valve, the fourth valve, the second weight recording regulating valve, the tenth valve and the eleventh valve are in a closed state; when cleaning, opening a tenth valve and a fourth valve, starting a 2# modified asphalt circulating pump, injecting tar stored in a tar intermediate tank into a 2# reaction kettle, closing the tenth valve and opening a third valve when the weight recording and adjusting instrument II displays that the liquid level in the 2# reaction kettle reaches a set value, so that a closed cycle is formed among the 2# reaction kettle, the 2# modified asphalt circulating pump and the 2# tubular furnace; cleaning a 2# modified asphalt circulating pump and a 2# tubular furnace tube by using tar as a cleaning medium, and cleaning all equipment and pipelines of a secondary modification reaction unit; after the cyclic cleaning is carried out for 1-2 hours, opening a valve eleven, closing a valve IV, sending the tar in the 2# reaction kettle back to the tar intermediate tank, closing the valve eleven when the weight recording and adjusting instrument II shows that the tar amount in the 2# reaction kettle is zero, stopping the 2# modified asphalt circulating pump, and blowing the residual tar back to the tar intermediate tank through a blowing pipe;
3) stopping and cleaning the modifying and cooling unit;
emptying all the asphalt in the modification cooling unit to a subsequent asphalt molding system, and immediately cleaning the modification cooling unit when the asphalt is waste heat; before cleaning, the fifth valve, the sixth valve, the seventh valve, the third weight recording adjusting valve, the twelfth valve and the thirteenth valve are in a closed state; during cleaning, opening a valve twelve and a valve six, starting the asphalt circulating pump of the upgrading tower, and injecting the tar stored in the tar intermediate tank into the upgrading tower; when the weight recording and adjusting instrument III displays that the liquid level of the modifying tower reaches a set value, closing the valve twelve and opening the valve five to form closed circulation between the modifying tower and the modifying tower asphalt circulating pump; the tar is used as a cleaning medium to clean a circulating pump of the upgrading tower and a circulating pipeline of the upgraded asphalt, and all equipment and pipelines in the upgrading cooling unit are cleaned; after the cyclic cleaning is carried out for 1-2 hours, opening the third weight recording adjusting valve and closing the sixth valve, conveying tar in the modifying tower to an asphalt falling film cooler through an asphalt heat exchanger, and allowing the tar to enter each downcomer in a full flow mode to form a uniform liquid film which flows downwards in each downcomer; finally, collecting tar into an asphalt storage tank at the lower part, opening a thirteen valve when the liquid level displayed by the liquid level recording and adjusting instrument reaches a set liquid level, starting an asphalt feeding pump, and sending the tar in the asphalt storage tank back to the tar intermediate tank; when the third weight recording and adjusting instrument displays that tar in the upgrading tower is zero, the third weight recording and adjusting instrument is closed, the third upgrading tower asphalt circulating pump is stopped, and the asphalt feeding pump is cut off to be interlocked with the liquid level of the liquid level recording and adjusting instrument; when the liquid level recording and adjusting instrument displays that the liquid level in the asphalt storage tank is zero, the asphalt feeding pump is closed, the valve thirteen is closed, and the residual tar is swept back to the tar intermediate tank through the sweeping pipe.
In the step 1), the set value of the liquid level of the 1# reaction kettle is not less than 1/4 of the volume of the 1# reaction kettle; in the step 2), the set value of the liquid level of the 2# reaction kettle is not less than 1/4 of the volume of the 2# reaction kettle; in the step 3), the liquid level set value of the upgrading tower is not less than 1/4 of the volume of the upgrading tower; the set value of the liquid level in the asphalt storage tank is not less than 1/2 of the volume of the asphalt storage tank.
And (3) after the tar in the tar intermediate tank is subjected to multiple cleaning operations, the tar is returned to the tar oil depot by using a No. 1 modified asphalt circulating pump or a No. 2 modified asphalt circulating pump through a waste tar pipeline.
Compared with the prior art, the invention has the beneficial effects that:
1) the invention adds the cleaning function on the basis of the conventional tube furnace heating modified asphalt production system, and thoroughly cleans all asphalt equipment and pipelines in the production system by adding a tar intermediate tank and matched pipelines and taking tar as a cleaning medium and skillfully utilizing an asphalt circulating pump in the original process, thereby avoiding all hidden troubles of difficult re-operation caused by equipment or pipeline blockage;
2) the service life of the asphalt circulating pump is prolonged;
3) the cleaning process is simple, the operation is convenient, and compared with the prior method of purging, the cleaning is more thorough;
4) on the basis that all valves adopt electric valves, full-automatic program operation can be realized.
Drawings
FIG. 1 is a schematic structural diagram of a system for producing modified asphalt by a tubular furnace heating method according to the present invention.
In the figure: 1.1# reaction kettle 2.2# reaction kettle 3, upgrading tower 4.1# tubular furnace 5.2# tubular furnace 6, pitch heat exchanger 7, falling film cooler 8, steam condenser 9, condensate water tank 10.1# modified pitch circulating pump 11.2# modified pitch circulating pump 12, upgrading tower pitch circulating pump 13, pitch feeding pump 14, condensate water pump 15, weight recording regulating valve I16, weight recording regulating valve II 17, weight recording regulating valve III 18, jet mixer 19, valve I20, valve II 21, valve III 22, valve IV 23, valve V24, valve VI 25, valve VII 26, tar middle tank 27, valve eight 28, valve nine 29, valve eleven 30, valve twelve 32, valve thirteen WR 01, weight recording control instrument WRC02, weight recording control instrument WRC03, CcC 01, liquid level recording control instrument.
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings:
as shown in fig. 1, the system for producing modified asphalt by a tubular furnace heating method according to the present invention comprises a double-furnace double-kettle modified asphalt production system composed of a # 1 reaction kettle 1, a # 1 tubular furnace 4, a # 2 reaction kettle 2, a # 2 tubular furnace 5, a modifying tower 3 and a falling film cooler 7; wherein, the 1# reaction kettle 1, the 1# tubular furnace 4 and the connecting pipeline system form a primary modification reaction unit, and the 2# reaction kettle 2, the 2# tubular furnace 5 and the connecting pipeline system form a secondary modification reaction unit; the reforming tower 3, the falling film cooler 7 and the connecting pipeline system form a reforming cooling unit; the device also comprises a tar circulating cleaning system; the tar circulation cleaning system consists of a tar intermediate tank 26, a tar cleaning pipeline and a tar recovery pipeline, wherein the tar intermediate tank 26 is respectively connected with a primary modification reaction unit, a secondary modification reaction unit and a modification cooling unit through the tar cleaning pipeline and the tar recovery pipeline to form a circulation cleaning loop.
The upper part of the No. 1 reaction kettle 1 is provided with a first heated asphalt inlet, the top part is provided with a first flash evaporation oil gas outlet, and the bottom part is provided with a first asphalt outlet; the first asphalt outlet is connected with the inlet of the No. 1 tube furnace 4 through a first asphalt circulating pipeline, and a No. 1 modified asphalt circulating pump 10 is arranged on the first asphalt circulating pipeline; the first heating asphalt inlet is connected with an outlet of the No. 1 tubular furnace 1 through a first heating circulation pipeline, and a medium temperature asphalt inlet arranged on the first heating asphalt circulation pipeline is connected with a medium temperature asphalt pipeline;
the upper part of the No. 2 reaction kettle 2 is provided with a second heated asphalt inlet, the top part is provided with a second flash evaporation oil gas outlet, and the bottom part is provided with a second asphalt outlet; the asphalt outlet II is connected with the inlet of the No. 2 tube furnace 5 through an asphalt circulating pipeline II, a No. 2 modified asphalt circulating pump 11 and a jet mixer 18 are sequentially arranged on the asphalt circulating pipeline II along the asphalt flowing direction, and the jet mixer 18 is connected with an asphalt circulating pipeline I through an asphalt connecting pipeline I; the second heating asphalt inlet is connected with the outlet of the No. 2 tube furnace 5 through a second heating circulating pipeline;
an asphalt inlet is formed in one side of the upper part of the upgrading tower 3, a circulating asphalt inlet is formed in the other side of the upper part of the upgrading tower, a flash evaporation oil gas outlet III is formed in the top of the upgrading tower, and a modified asphalt outlet is formed in the bottom of the upgrading tower; the asphalt inlet is connected with an asphalt circulating pipeline II at the upstream of the jet mixer 18 through an asphalt connecting pipeline II; the modified asphalt outlet is connected with the circulating asphalt inlet through a modified asphalt circulating pipeline; the modified asphalt circulating pipeline is provided with a modified tower asphalt circulating pump 12;
one side of the upper part of the falling film cooler 7 is provided with a modified asphalt inlet, the other side of the upper part is provided with a water vapor outlet, the other side of the lower part is provided with a steam condensate inlet, and the bottom of the falling film cooler is provided with a modified asphalt outlet after heat exchange; the modified asphalt inlet is connected with a modified asphalt circulating pipeline through a modified asphalt inlet pipeline, and an asphalt heat exchanger 6 is arranged on the modified asphalt inlet pipeline; the steam outlet is connected with the steam condensate inlet through a steam pipeline, and a steam condenser 8, a condensate water tank 9 and a condensate water pump 14 are sequentially arranged on the steam pipeline in the steam flowing direction; the modified asphalt outlet after heat exchange is connected with a modified asphalt outlet pipeline, and an asphalt feeding pump 13 is arranged on the modified asphalt outlet pipeline;
the top of the tar intermediate tank 26 is provided with a tar inlet and a waste tar inlet, and the lower part is provided with a tar outlet; the tar inlet is connected with a tar conveying pipeline; the tar outlet is respectively connected with an asphalt circulating pipeline I, an asphalt circulating pipeline II, a modified asphalt circulating pipeline and a modified asphalt outlet pipeline through a tar cleaning pipeline; the waste tar inlet is respectively connected with an asphalt circulating pipeline I, an asphalt circulating pipeline II and a modified asphalt outlet pipeline through a tar recovery pipeline; the waste tar inlet pipeline is additionally connected with a tar oil depot through a waste tar pipeline.
A first valve 19 is arranged at one asphalt outlet of the 1# reaction kettle 1; a second valve 20 is arranged at the upstream of the connection part of the first asphalt circulating pipeline and the first asphalt connecting pipeline; a third valve 21 is arranged at the second asphalt outlet of the 2# reaction kettle 2; a fourth valve 22 is arranged at the upstream of the joint of the second asphalt circulating pipeline and the second asphalt connecting pipeline; a fifth valve 23 is arranged at the modified asphalt outlet of the modifying tower 3; a sixth valve 24 is arranged at the downstream of the joint of the modified asphalt circulating pipeline and the modified asphalt inlet pipeline; a seventh valve 25 is arranged at the downstream of the asphalt feeding pump 13 of the modified asphalt outlet pipeline; a valve eight 27 is arranged at one position of the tar cleaning pipeline, which is close to the asphalt circulating pipeline; a ninth valve 28 is arranged at one position of the tar recovery pipeline, which is close to the asphalt circulation pipeline; a valve ten 29 is arranged at the position of the tar cleaning pipeline close to the second asphalt circulating pipeline; eleven valves 30 are arranged at the positions, close to the asphalt circulating pipeline, of the tar recovery pipeline II; a twelve 31 valve is arranged at the position of the tar cleaning pipeline close to the modified asphalt circulating pipeline; and a thirteen 32 valve is arranged at the position of the tar recovery pipeline close to the modified asphalt outlet pipeline.
A first weight recording control instrument WRC01 is arranged on the No. 1 reaction kettle 1, a first weight recording adjusting valve 15 is arranged on the first asphalt connecting pipeline, and the first weight recording control instrument WRC01 and the first weight recording adjusting valve 15 are controlled in an interlocking mode.
And a second weight recording control instrument WRC02 is arranged on the No. 2 reaction kettle 2, a second weight recording adjusting valve 16 is arranged on the second asphalt connecting pipeline, and the second weight recording control instrument WRC02 and the second weight recording adjusting valve 16 are controlled in an interlocking manner.
The modified asphalt inlet pipeline is provided with a third weight recording control instrument WRC03, and the third weight recording control instrument WRC03 and the third weight recording control instrument WRC 17 are controlled in an interlocking manner.
The falling film cooler 7 is provided with a liquid level recording and adjusting instrument LRC01 at the position corresponding to the asphalt storage tank at the lower part, and the liquid level recording and adjusting instrument LRC01 and the asphalt feeding pump 13 are controlled in an interlocking manner.
The cleaning process of the tubular furnace heating method modified asphalt production system comprises the following steps:
1) the primary modification reaction unit is shut down and cleaned;
stopping the 1# tubular furnace 4, and emptying all the asphalt in the primary modification reaction unit into the secondary modification reaction unit through an asphalt connecting pipeline I; immediately cleaning the primary modification reaction unit while the waste heat is still; before cleaning, the first valve 19, the second valve 20, the first weight recording regulating valve WRC01, the eighth valve 27 and the ninth valve 28 are in a closed state; during cleaning, opening a valve eight 27 and a valve two 20, starting the No. 1 modified asphalt circulating pump 10, injecting tar stored in the tar intermediate tank 26 into the No. 1 reaction kettle 1, closing the valve eight 27 and opening a valve one 19 when a weight recording and adjusting instrument one WRC01 shows that the liquid level in the No. 1 reaction kettle 1 reaches a set value, so that a closed cycle is formed among the No. 1 reaction kettle 1, the No. 1 modified asphalt circulating pump 10 and the No. 1 tubular furnace 4; cleaning a No. 1 modified asphalt circulating pump 10 and a No. 1 tubular furnace 4 furnace tube by using tar as a cleaning medium, and additionally cleaning all equipment and pipelines of a primary modification reaction unit; after the cyclic cleaning is carried out for 1-2 hours, opening the ninth valve 28, closing the second valve 20, sending the tar in the primary modification reaction unit back to the tar intermediate tank 26, when the weight recording and adjusting instrument-WRC 01 shows that the tar amount in the 1# reaction kettle 1 is zero, closing the ninth valve 28, stopping the 1# modified asphalt circulating pump 10, and blowing the residual tar back to the tar intermediate tank 26 through a blowing pipe;
2) stopping and cleaning the secondary modification reaction unit;
stopping the 2# tubular furnace 5, and completely emptying the asphalt in the secondary upgrading reaction unit to the upgrading tower 3; immediately cleaning the second-step modification reaction unit while the waste heat is still; before cleaning, the third valve 21, the fourth valve 22, the second weight recording regulating valve WRC02, the tenth valve 29 and the eleventh valve 30 are in a closed state; during cleaning, opening a valve ten 29 and a valve four 22, starting the 2# modified asphalt circulating pump 11, injecting tar stored in the tar intermediate tank 26 into the 2# reaction kettle 2, closing the valve ten 29 and opening a valve three 21 when the weight recording and adjusting instrument two WRC02 shows that the liquid level in the 2# reaction kettle 2 reaches a set value, so that closed circulation is formed among the 2# reaction kettle 2, the 2# modified asphalt circulating pump 11 and the 2# tubular furnace 5; cleaning the No. 2 modified asphalt circulating pump 11 and the No. 2 tubular furnace 5 furnace tube by using tar as a cleaning medium, and cleaning all equipment and pipelines of a secondary modification reaction unit; after the cyclic cleaning is carried out for 1-2 hours, opening a valve eleven 30, closing a valve IV 22, sending the tar in the 2# reaction kettle 5 back to the tar intermediate tank 26, when the weight recording and adjusting instrument II ERC02 shows that the tar amount in the 2# reaction kettle 2 is zero, closing the valve eleven 30, stopping the 2# modified asphalt circulating pump 11, and blowing the residual tar back to the tar intermediate tank 26 through a blowing pipe;
3) stopping and cleaning the modifying and cooling unit;
emptying all the asphalt in the modification cooling unit to a subsequent asphalt molding system, and immediately cleaning the modification cooling unit when the asphalt is waste heat; before cleaning, the five 23, six 24, seven 25, three WRC03, twelve 31 and thirteen 32 valves are in closed state; during cleaning, opening a valve twelve 31 and a valve six 24, starting the asphalt circulating pump 12 of the upgrading tower, and injecting the tar stored in the tar intermediate tank 26 into the upgrading tower 3; when the weight recording and adjusting instrument III WRC03 shows that the liquid level of the modification tower 3 reaches the set value, closing the valve III 31 and opening the valve V23 to form closed circulation between the modification tower 3 and the modification tower asphalt circulating pump 12; the tar is used as a cleaning medium to clean the circulating pump 12 of the upgrading tower and the circulating pipeline of the upgraded asphalt, and all equipment and pipelines in the upgrading cooling unit are cleaned; after the cyclic cleaning is carried out for 1-2 hours, opening a weight recording regulating valve triple WRC03 and closing a valve six 24, sending tar in the upgrading tower 3 to an asphalt falling film cooler 7 through an asphalt heat exchanger 6, and entering each downcomer in a full flow mode to form a uniform liquid film flowing downwards in each downcomer; finally, collecting tar into an asphalt storage tank at the lower part, opening a thirteen 32 valve when the liquid level displayed by a liquid level recording and adjusting instrument LRC01 reaches a set liquid level, starting an asphalt feeding pump 13, and sending the tar in the asphalt storage tank back to the tar intermediate tank 26; when the weight recording and adjusting instrument three WRC03 shows that tar in the upgrading tower 3 is zero, closing the weight recording and adjusting valve three WRC03, stopping the asphalt circulating pump 12 of the upgrading tower, and cutting off the liquid level interlock of the asphalt feeding pump 13 and the liquid level recording and adjusting instrument LRC 01; when the level recording regulating meter LRC01 shows that the liquid level in the asphalt storage tank is zero, the asphalt feeding pump 13 is closed, the valve thirteen 32 is closed, and the residual tar is swept back to the tar intermediate tank 26 through the sweeping pipe.
In the step 1), the set value of the liquid level of the 1# reaction kettle 1 is not less than 1/4 of the volume of the 1# reaction kettle 1; in the step 2), the set value of the liquid level of the 2# reaction kettle 2 is not less than 1/4 of the volume of the 2# reaction kettle 2; in the step 3), the liquid level set value of the upgrading tower 3 is not less than 1/4 of the volume of the upgrading tower 3; the set value of the liquid level in the asphalt storage tank is not less than 1/2 of the volume of the asphalt storage tank.
The tar in the tar intermediate tank 26 is subjected to a plurality of cleaning operations, and then returned to the tar oil depot through a waste tar pipeline by using the # 1 modified asphalt circulating pump 10 or the # 2 modified asphalt circulating pump 11.
In the production system of the modified asphalt by the tubular furnace heating method, the modified asphalt is produced by the double-furnace double-kettle tubular furnace heating method, and the production process comprises the following steps: external medium-temperature asphalt enters the No. 1 reaction kettle 1 through the first heating and circulating asphalt pipeline to perform primary modification reaction, the bottom of the No. 1 reaction kettle 1 is discharged, the asphalt is sent to the No. 1 tubular furnace 4 by the No. 1 modified asphalt circulating pump 10 to be heated, the heated asphalt is used as a heat source for the modification reaction of the No. 1 reaction kettle 1, and the discharge amount of the primary modification reaction unit is adjusted through the constant weight of a weight recording and adjusting instrument WRC 01; the discharge of the primary modification reaction unit enters a jet mixer 18, is sucked into an asphalt circulating pipeline II through vacuum generated by the jet mixer 18, is heated by a No. 2 tubular furnace 5, and then enters a No. 2 reaction kettle 2 for secondary modification reaction; the discharged material at the bottom of the 2# reaction kettle 2 is sent to the 2# tubular furnace 5 by a 2# modified asphalt circulating pump 11 for heating, the heated asphalt is used as a heat source for the 2# reaction kettle 1 modification reaction, and the discharged material of the secondary modification reaction unit is adjusted by constant weight of a second WRC02 weight recording and adjusting instrument; discharging from the secondary modification reaction unit to a modification tower 3, carrying out flash evaporation modification reaction by using waste heat, recording the constant weight of an adjusting instrument triple WRC03 according to the weight, adjusting the discharging amount of the modification tower 3, carrying out heat exchange between the discharging from the modification tower 3 and raw material tar through an asphalt heat exchanger 6, sending the discharging to a falling film cooler 7, carrying out heat exchange between the falling film cooler 7 and steam condensate, and sending the discharging to a subsequent asphalt forming system through an asphalt feeding pump 13.
On the basis of the production system for producing modified asphalt by a conventional double-furnace double-kettle tubular furnace heating method, the invention is additionally provided with a tar intermediate tank 26 for storing tar delivered from a tar oil depot, wherein the tar is used as a washing medium. The tar intermediate tank 26 is connected to the primary reforming reaction unit, the secondary reforming reaction unit, and the reforming cooling unit through pipes, and a plurality of valves are provided. Wherein:
and the eighth valve 27 is positioned on a connecting pipeline between the tar cleaning pipeline and the first asphalt circulating pipeline, and the connecting pipeline is a tar input pipeline for cleaning the primary modification reaction unit.
The ninth valve 28 is located on a connecting pipeline between the tar recovery pipeline and the first asphalt circulation pipeline, and the connecting pipeline is a tar output pipeline for cleaning the primary modification reaction unit.
And the valve ten 29 is positioned on a connecting pipeline between the tar cleaning pipeline and the asphalt circulating pipeline II, and the connecting pipeline is a tar input pipeline for cleaning the secondary upgrading reaction unit.
The eleventh valve 30 is positioned on a connecting pipeline between the tar recovery pipeline and the second asphalt circulation pipeline, and the connecting pipeline is a tar output pipeline for cleaning the secondary upgrading reaction unit.
The valve twelve 31 is positioned on the connecting pipeline between the tar cleaning pipeline and the modified asphalt circulating pipeline, and the connecting pipeline is a tar input pipeline for cleaning the modified cooling unit.
Thirteen 32 valves are positioned on the connecting pipeline between the tar recovery pipeline and the modified asphalt outlet pipeline, and the connecting pipeline is a tar output pipeline for cleaning the modified cooling unit.
The cleaning process of the modified asphalt production system by the tubular furnace heating method is matched with shutdown operation of the modified asphalt production process by the double-furnace double-kettle tubular furnace heating method to clean pipelines and equipment.
After the tar is cleaned for a plurality of times, the tar is sent back to the tar oil depot by a No. 1 modified asphalt circulating pump 10 or a No. 2 modified asphalt circulating pump 11, and is mixed with the tar raw material for recycling.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. A tubular furnace heating method modified asphalt production system comprises a double-furnace double-kettle modified asphalt production system consisting of a 1# reaction kettle, a 1# tubular furnace, a 2# reaction kettle, a 2# tubular furnace, a modifying tower and a falling film cooler; wherein the 1# reaction kettle, the 1# tubular furnace and the connecting pipeline system form a primary modification reaction unit, and the 2# reaction kettle, the 2# tubular furnace and the connecting pipeline system form a secondary modification reaction unit; the modifying tower, the falling film cooler and the connecting pipeline system form a modifying cooling unit; it is characterized by also comprising a tar circulating cleaning system; the tar circulating and cleaning system consists of a tar intermediate tank, a tar cleaning pipeline and a tar recovery pipeline, wherein the tar intermediate tank is respectively connected with the primary modification reaction unit, the secondary modification reaction unit and the modification cooling unit through the tar cleaning pipeline and the tar recovery pipeline to form a circulating and cleaning loop.
2. The system for producing the modified asphalt by the tubular furnace heating method according to claim 1, wherein a first heated asphalt inlet is arranged at the upper part of the No. 1 reaction kettle, a first flash evaporation oil gas outlet is arranged at the top part of the reaction kettle, and a first asphalt outlet is arranged at the bottom part of the reaction kettle; the first asphalt outlet is connected with the inlet of the No. 1 tube furnace through a first asphalt circulating pipeline, and the first asphalt circulating pipeline is provided with a No. 1 modified asphalt circulating pump; the first heating asphalt inlet is connected with the outlet of the No. 1 tube furnace through a first heating circulation pipeline, and a medium temperature asphalt inlet arranged on the first heating asphalt circulation pipeline is connected with a medium temperature asphalt pipeline;
the upper part of the No. 2 reaction kettle is provided with a second heated asphalt inlet, the top of the reaction kettle is provided with a second flash evaporation oil gas outlet, and the bottom of the reaction kettle is provided with a second asphalt outlet; the asphalt outlet II is connected with the inlet of the No. 2 tube furnace through an asphalt circulating pipeline II, a No. 2 modified asphalt circulating pump and a jet mixer are sequentially arranged on the asphalt circulating pipeline II along the asphalt flowing direction, and the jet mixer is connected with the asphalt circulating pipeline I through an asphalt connecting pipeline I; the second heating asphalt inlet is connected with the outlet of the No. 2 tube furnace through a second heating circulating pipeline;
an asphalt inlet is formed in one side of the upper part of the upgrading tower, a circulating asphalt inlet is formed in the other side of the upper part of the upgrading tower, a flash evaporation oil gas outlet III is formed in the top of the upgrading tower, and a modified asphalt outlet is formed in the bottom of the upgrading tower; the asphalt inlet is connected with an asphalt circulating pipeline II at the upstream of the jet mixer through an asphalt connecting pipeline II; the modified asphalt outlet is connected with the circulating asphalt inlet through a modified asphalt circulating pipeline; the modified asphalt circulating pipeline is provided with a modified tower asphalt circulating pump;
one side of the upper part of the falling film cooler is provided with a modified asphalt inlet, the other side of the upper part of the falling film cooler is provided with a water vapor outlet, the other side of the lower part of the falling film cooler is provided with a steam condensate inlet, and the bottom of the falling film cooler is provided with a modified asphalt outlet after heat exchange; the modified asphalt inlet is connected with a modified asphalt circulating pipeline through a modified asphalt inlet pipeline, and an asphalt heat exchanger is arranged on the modified asphalt inlet pipeline; the steam outlet is connected with the steam condensate inlet through a steam pipeline, and a steam condenser, a condensate water tank and a condensate water pump are sequentially arranged on the steam pipeline in the steam flowing direction; the modified asphalt outlet after heat exchange is connected with a modified asphalt outlet pipeline, and an asphalt feeding pump is arranged on the modified asphalt outlet pipeline;
the top of the tar intermediate tank is provided with a tar inlet and a waste tar inlet, and the lower part of the tar intermediate tank is provided with a tar outlet; the tar inlet is connected with a tar conveying pipeline; the tar outlet is respectively connected with an asphalt circulating pipeline I, an asphalt circulating pipeline II, a modified asphalt circulating pipeline and a modified asphalt outlet pipeline through a tar cleaning pipeline; the waste tar inlet is respectively connected with an asphalt circulating pipeline I, an asphalt circulating pipeline II and a modified asphalt outlet pipeline through a tar recovery pipeline; the waste tar inlet pipeline is additionally connected with a tar oil depot through a waste tar pipeline.
3. The system for producing the modified asphalt by the tubular furnace heating method according to claim 1, wherein a first valve is arranged at one asphalt outlet of the No. 1 reaction kettle; a second valve is arranged at the upstream of the connection position of the first asphalt circulating pipeline and the first asphalt connecting pipeline; a third valve is arranged at the second asphalt outlet of the 2# reaction kettle; a fourth valve is arranged at the upstream of the joint of the second asphalt circulating pipeline and the second asphalt connecting pipeline; a fifth valve is arranged at the modified asphalt outlet of the modifying tower; a sixth valve is arranged at the downstream of the joint of the modified asphalt circulating pipeline and the modified asphalt inlet pipeline; a seventh valve is arranged at the downstream of the asphalt feeding pump of the modified asphalt outlet pipeline; a valve eighth is arranged at one position of the tar cleaning pipeline, which is close to the asphalt circulating pipeline; a ninth valve is arranged at a position, close to the asphalt circulating pipeline, of the tar recovery pipeline; a tenth valve is arranged at a position, close to the second asphalt circulating pipeline, of the tar cleaning pipeline; a valve eleven is arranged at a position, close to the asphalt circulating pipeline II, of the tar recovery pipeline; a valve twelve is arranged at the position of the tar cleaning pipeline close to the modified asphalt circulating pipeline; and a thirteen valve is arranged at the position of the tar recovery pipeline close to the modified asphalt outlet pipeline.
4. The system for producing modified asphalt by a tube furnace heating method according to claim 1, wherein a first weight recording control instrument is arranged on the No. 1 reaction kettle, a first weight recording adjusting valve is arranged on the first asphalt connecting pipeline, and the first weight recording control instrument and the first weight recording adjusting valve are controlled in an interlocking manner.
5. The system for producing modified asphalt by a tube furnace heating method according to claim 1, wherein a second weight recording control instrument is arranged on the # 2 reaction kettle, a second weight recording adjusting valve is arranged on the second asphalt connecting pipeline, and the second weight recording control instrument and the second weight recording adjusting valve are subjected to dual lock control.
6. The system for producing upgraded asphalt by the tubular furnace heating method according to claim 1, wherein a third weight recording control instrument is arranged on the upgrading tower, a third weight recording adjusting valve is arranged on the upgraded asphalt inlet pipeline, and the third weight recording control instrument and the third weight recording adjusting valve are in triple lock control.
7. The system for producing the modified asphalt by the heating method of the tube furnace according to claim 1, wherein the falling film cooler is provided with a liquid level recording and adjusting instrument at an asphalt storage tank corresponding to the lower part of the falling film cooler, and the liquid level recording and adjusting instrument is controlled in an interlocking manner with an asphalt feeding pump.
8. The cleaning process of the tubular furnace heating method modified asphalt production system according to any one of claims 1 to 7, which is characterized by comprising the following steps:
1) the primary modification reaction unit is shut down and cleaned;
stopping the 1# tubular furnace, and emptying all the asphalt in the primary modification reaction unit into the secondary modification reaction unit through an asphalt connecting pipeline I; immediately cleaning the primary modification reaction unit while the waste heat is still; before cleaning, the first valve, the second valve, the first weight recording regulating valve, the eighth valve and the ninth valve are in a closed state; when cleaning, opening a valve eight and a valve two, starting a 1# modified asphalt circulating pump, injecting tar stored in a tar intermediate tank into a 1# reaction kettle, closing the valve eight when a weight recording and adjusting instrument I displays that the liquid level in the 1# reaction kettle reaches a set value, and opening the valve one to form closed circulation among the 1# reaction kettle, the 1# modified asphalt circulating pump and the 1# tubular furnace; cleaning a No. 1 modified asphalt circulating pump and a No. 1 tubular furnace tube by using tar as a cleaning medium, and cleaning all equipment and pipelines of a primary modification reaction unit; after the cyclic cleaning is carried out for 1-2 hours, opening a valve II, closing a valve II, sending the tar in the primary modification reaction unit back to the tar intermediate tank, closing the valve II when the weight recording and adjusting instrument I shows that the tar amount in the reaction kettle 1 is zero, stopping the modified asphalt circulating pump 1, and blowing the residual tar back to the tar intermediate tank through a blowing pipe;
2) stopping and cleaning the secondary modification reaction unit;
stopping the 2# tubular furnace, and completely emptying the asphalt in the secondary modification reaction unit to the modification tower; immediately cleaning the second-step modification reaction unit while the waste heat is still; before cleaning, the third valve, the fourth valve, the second weight recording regulating valve, the tenth valve and the eleventh valve are in a closed state; when cleaning, opening a tenth valve and a fourth valve, starting a 2# modified asphalt circulating pump, injecting tar stored in a tar intermediate tank into a 2# reaction kettle, closing the tenth valve and opening a third valve when the weight recording and adjusting instrument II displays that the liquid level in the 2# reaction kettle reaches a set value, so that a closed cycle is formed among the 2# reaction kettle, the 2# modified asphalt circulating pump and the 2# tubular furnace; cleaning a 2# modified asphalt circulating pump and a 2# tubular furnace tube by using tar as a cleaning medium, and cleaning all equipment and pipelines of a secondary modification reaction unit; after the cyclic cleaning is carried out for 1-2 hours, opening a valve eleven, closing a valve IV, sending the tar in the 2# reaction kettle back to the tar intermediate tank, closing the valve eleven when the weight recording and adjusting instrument II shows that the tar amount in the 2# reaction kettle is zero, stopping the 2# modified asphalt circulating pump, and blowing the residual tar back to the tar intermediate tank through a blowing pipe;
3) stopping and cleaning the modifying and cooling unit;
emptying all the asphalt in the modification cooling unit to a subsequent asphalt molding system, and immediately cleaning the modification cooling unit when the asphalt is waste heat; before cleaning, the fifth valve, the sixth valve, the seventh valve, the third weight recording adjusting valve, the twelfth valve and the thirteenth valve are in a closed state; during cleaning, opening a valve twelve and a valve six, starting the asphalt circulating pump of the upgrading tower, and injecting the tar stored in the tar intermediate tank into the upgrading tower; when the weight recording and adjusting instrument III displays that the liquid level of the modifying tower reaches a set value, closing the valve twelve and opening the valve five to form closed circulation between the modifying tower and the modifying tower asphalt circulating pump; the tar is used as a cleaning medium to clean a circulating pump of the upgrading tower and a circulating pipeline of the upgraded asphalt, and all equipment and pipelines in the upgrading cooling unit are cleaned; after the cyclic cleaning is carried out for 1-2 hours, opening the third weight recording adjusting valve and closing the sixth valve, conveying tar in the modifying tower to an asphalt falling film cooler through an asphalt heat exchanger, and allowing the tar to enter each downcomer in a full flow mode to form a uniform liquid film which flows downwards in each downcomer; finally, collecting tar into an asphalt storage tank at the lower part, opening a thirteen valve when the liquid level displayed by the liquid level recording and adjusting instrument reaches a set liquid level, starting an asphalt feeding pump, and sending the tar in the asphalt storage tank back to the tar intermediate tank; when the third weight recording and adjusting instrument displays that tar in the upgrading tower is zero, the third weight recording and adjusting instrument is closed, the third upgrading tower asphalt circulating pump is stopped, and the asphalt feeding pump is cut off to be interlocked with the liquid level of the liquid level recording and adjusting instrument; when the liquid level recording and adjusting instrument displays that the liquid level in the asphalt storage tank is zero, the asphalt feeding pump is closed, the valve thirteen is closed, and the residual tar is swept back to the tar intermediate tank through the sweeping pipe.
9. The cleaning process of the tubular furnace heating modified asphalt production system according to claim 8, wherein in the step 1), the set value of the liquid level of the 1# reaction kettle is not less than 1/4 of the volume of the 1# reaction kettle; in the step 2), the set value of the liquid level of the 2# reaction kettle is not less than 1/4 of the volume of the 2# reaction kettle; in the step 3), the liquid level set value of the upgrading tower is not less than 1/4 of the volume of the upgrading tower; the set value of the liquid level in the asphalt storage tank is not less than 1/2 of the volume of the asphalt storage tank.
10. The cleaning process of the system for producing modified asphalt by tubular furnace heating according to claim 8, wherein the tar in the tar intermediate tank is returned to the tar storage through a waste tar pipe by using a # 1 modified asphalt circulating pump or a # 2 modified asphalt circulating pump after a plurality of cleaning operations.
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| CN202011348611.7A CN112342048A (en) | 2020-11-26 | 2020-11-26 | Tubular furnace heating method modified asphalt production system and cleaning process thereof |
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| CN202011348611.7A CN112342048A (en) | 2020-11-26 | 2020-11-26 | Tubular furnace heating method modified asphalt production system and cleaning process thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113731978A (en) * | 2021-08-31 | 2021-12-03 | 山东常任新材料有限公司 | Cleaning method for cleaning reaction kettle for preparing mesophase pitch |
| CN114164013A (en) * | 2021-12-20 | 2022-03-11 | 祥峰科技有限公司 | Modified asphalt preparation system |
| CN114540064A (en) * | 2022-03-04 | 2022-05-27 | 中冶焦耐(大连)工程技术有限公司 | Process and system for producing modified asphalt by combining direct heating kettle with modifying tower |
-
2020
- 2020-11-26 CN CN202011348611.7A patent/CN112342048A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113731978A (en) * | 2021-08-31 | 2021-12-03 | 山东常任新材料有限公司 | Cleaning method for cleaning reaction kettle for preparing mesophase pitch |
| CN114164013A (en) * | 2021-12-20 | 2022-03-11 | 祥峰科技有限公司 | Modified asphalt preparation system |
| CN114540064A (en) * | 2022-03-04 | 2022-05-27 | 中冶焦耐(大连)工程技术有限公司 | Process and system for producing modified asphalt by combining direct heating kettle with modifying tower |
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