CN110551513B - Multi-pipe layer asphalt falling film cooler and asphalt cooling forming process applied by same - Google Patents
Multi-pipe layer asphalt falling film cooler and asphalt cooling forming process applied by same Download PDFInfo
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- CN110551513B CN110551513B CN201910906078.2A CN201910906078A CN110551513B CN 110551513 B CN110551513 B CN 110551513B CN 201910906078 A CN201910906078 A CN 201910906078A CN 110551513 B CN110551513 B CN 110551513B
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- 239000010426 asphalt Substances 0.000 title claims abstract description 391
- 239000011552 falling film Substances 0.000 title claims abstract description 80
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000001816 cooling Methods 0.000 title claims abstract description 22
- 239000007788 liquid Substances 0.000 claims abstract description 245
- 238000003860 storage Methods 0.000 claims abstract description 100
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 90
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 45
- 238000005192 partition Methods 0.000 claims abstract description 16
- 238000000926 separation method Methods 0.000 claims description 43
- 230000001105 regulatory effect Effects 0.000 claims description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 238000009826 distribution Methods 0.000 claims description 14
- 239000002994 raw material Substances 0.000 claims description 12
- 239000010408 film Substances 0.000 claims description 11
- 239000000498 cooling water Substances 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 3
- 238000000465 moulding Methods 0.000 abstract description 9
- 238000012545 processing Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 5
- 239000011269 tar Substances 0.000 description 5
- 238000013461 design Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000011280 coal tar Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011883 electrode binding agent Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
- C10C3/14—Solidifying, Disintegrating, e.g. granulating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B1/00—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser
- F28B1/02—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser using water or other liquid as the cooling medium
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
- F28F27/02—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus for controlling the distribution of heat-exchange media between different channels
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Civil Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention relates to the technical field of asphalt production and deep processing, in particular to a multi-pipe layer asphalt falling film cooler and an asphalt cooling molding process applied by the same. A partition plate is arranged at the top of an upper tube plate of the multi-tube-layer pitch falling film cooler to divide the top space of the upper tube plate into 2-N independent liquid division areas, pitch inlet connecting pipes and nitrogen inlet connecting pipes are respectively arranged at the top of the pitch falling film cooler corresponding to each liquid division area, each pitch inlet connecting pipe extends towards the center of the falling film cooler respectively, and a plurality of pitch distributing pipes are longitudinally arranged at the bottom of each pitch inlet connecting pipe; the bottom of the lower tube plate is provided with a baffle plate to divide the space of the asphalt storage tank into 2-N independent asphalt storage tanks, each asphalt storage tank is provided with a respective asphalt outlet pipe, and each asphalt storage tank corresponds to a liquid division area at the top of each asphalt storage tank. The problem of large heat exchange temperature difference can be solved through normal equipment height and single equipment, the equipment height is reduced, the process is simplified, the occupied area is small, and the investment cost and the operation cost are low.
Description
Technical Field
The invention relates to the technical field of asphalt production and deep processing, in particular to a multi-pipe layer asphalt falling film cooler and an asphalt cooling molding process applied by the same.
Background
In the coal tar processing process, about 50% -60% of medium-temperature asphalt is generally produced, which belongs to a large number of products for tar processing, and the modified asphalt is a main downstream product of the medium-temperature asphalt at present and is mainly used for producing prebaked anodes in the electrolytic aluminum industry and preparing battery bars or electrode binders.
The medium-temperature asphalt and modified asphalt products produced at home can be sold in a liquid loading mode or sold in a solid mode of asphalt solidification and cooling molding, but in either mode, the produced hot asphalt (medium-temperature asphalt or modified asphalt) needs to be cooled to medium-temperature liquid asphalt suitable for storage or low-temperature liquid asphalt for solidification molding.
The cooling mode of the medium-temperature asphalt produced by the prior tar distillation device and the modified asphalt produced by the medium-temperature asphalt by a kettle type heating method basically adopts an asphalt falling film cooler as cooling equipment, the cooling technology is that hot asphalt is sent to the falling film cooler after heat exchange by a heat exchanger before being loaded into a liquid asphalt removing device, an asphalt removing storage tank or an asphalt forming device, and then is sent to a nozzle of the loading device, the asphalt storage tank or the asphalt forming device by nitrogen pressure after heat exchange between the falling film cooler and steam condensate to the required temperature, and the specific detailed process is as follows: the upper part of the existing asphalt falling film cooler is provided with an asphalt storage tank, the lower part of the asphalt falling film cooler is provided with an asphalt storage tank, the downcomer of the upper heat exchanger is fixed through an upper fixed tube plate and a lower fixed tube plate, hot asphalt is uniformly distributed on the upper fixed tube plate through an asphalt distribution tube and enters into each downcomer in a full-flow mode, a uniform liquid film is formed in the downcomer to flow downwards, after the uniform liquid film exchanges heat with steam condensate of a shell side to reach the required temperature, the asphalt storage tank is collected to the lower part, the asphalt storage tank is kept at a certain liquid level, then the asphalt storage tank is conveyed to a nozzle of an asphalt storage tank or an asphalt forming device through nitrogen back pressure, and vaporized steam condensate is pumped back to the falling film cooler through a condensate tank after the steam condenser is cooled through circulating cooling water.
The asphalt falling film cooler is used as cooling equipment, the heat exchange effect is very good, but the asphalt falling film cooler has the limitation that the treatment capacity of each downcomer is fixed, the treatment capacity of the equipment is improved by increasing the number of the downcomers, namely the diameter of the equipment is increased, the cooling temperature difference of asphalt is increased, the height of the downcomers is increased, the outline dimension of the asphalt falling film cooler is very large and is difficult to overcome, if a plurality of asphalt falling film coolers are connected in series, the floor area is large, the process is complex, the investment is wasted, and the labor intensity is increased.
As described above, in the cooling process of asphalt, heat is often recovered by heat exchange before the asphalt is sent to the falling film cooler, because the temperature is very high, often approaching 400 ℃ before the asphalt is sent to the falling film cooler, and the asphalt heat exchanger is characterized by suspended matters contained in the asphalt itself, high softening point and high viscosity, so that the heat exchange efficiency gradually decreases with the passage of time, and even is blocked, and the blocking is the biggest obstacle of the asphalt heat exchanger and can not be overcome basically, so that the cooling temperature difference enrichment capacity of the design of the asphalt falling film cooler is very large for various working conditions to occur, and therefore, how to improve the cooling temperature difference of the asphalt by a single device is an urgent problem to be solved.
In summary, the existing asphalt falling film cooler only solves the material processing capability of the equipment, but cannot solve the temperature difference of the material; the overall dimension of the asphalt falling film cooler is usually thin and high, the cooling temperature difference of materials cannot be solved by using the diameter of equipment, the problem of large heat exchange temperature difference can be solved only by adopting a mode of connecting a plurality of asphalt falling film coolers in series, the occupied area is large by adopting a mode of connecting a plurality of asphalt falling film coolers in series, the process is complex, and the cost is high.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a multi-pipe layer asphalt falling film cooler and an asphalt cooling molding process applied to the same. The problem of large heat exchange temperature difference can be solved through normal equipment height and single equipment, the equipment height is reduced, the process is simplified, the occupied area is small, and the investment cost and the operation cost are low.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
The multi-tube layer asphalt falling film cooler comprises a downcomer liquid-liquid heat exchanger arranged at the upper part and an asphalt storage tank arranged at the lower part, wherein a plurality of downcomers in the downcomer liquid-liquid heat exchanger are fixed through an upper tube plate and a lower tube plate; the top of the asphalt falling film cooler is provided with an asphalt inlet connecting pipe, and the bottom is provided with an asphalt outlet; the top of the upper tube plate of the multi-tube layer pitch falling film cooler is provided with a baffle plate to divide the top space of the upper tube plate into 2-N independent liquid division areas, the top of the pitch falling film cooler corresponding to each liquid division area is respectively provided with a pitch inlet connecting pipe and a nitrogen inlet connecting pipe, each pitch inlet connecting pipe extends to the center of the falling film cooler respectively, and the bottom of each pitch inlet connecting pipe is longitudinally provided with a plurality of pitch distribution pipes; the bottom of the lower tube plate is provided with a baffle plate to divide the space of the asphalt storage tank into 2-N independent asphalt storage tanks, each asphalt storage tank is provided with a respective asphalt outlet pipe, and each asphalt storage tank corresponds to a liquid division area at the top of each asphalt storage tank.
The multi-layer asphalt falling film cooler can be used for medium-temperature asphalt, modified asphalt or other chemical raw materials with similar properties.
When the diameter of the multi-pipe layer asphalt falling film cooler is less than or equal to 1000mm, the top of the liquid separation area and the lower part of the asphalt storage tank adopt blind plates as sealing heads; when the diameter of the multi-pipe layer asphalt falling film cooler is more than 1000mm, the top of the liquid division area and the lower part of the asphalt storage tank should adopt an elliptical end socket.
An asphalt cooling molding process comprises the following steps:
1) The asphalt liquid is sent to an asphalt heat exchanger, after the asphalt heat exchanger exchanges heat with tar and recovers certain heat, the asphalt heat exchanger enters a1 st liquid dividing area of an asphalt falling film cooler, an upper tube plate is equivalent to a liquid receiving disc, the upper tube plate is divided into 2-N independent liquid dividing areas through a partition plate, a flow recording instrument is arranged on a raw material asphalt inlet pipe, and the flow of the liquid asphalt is measured and recorded through the flow recording instrument arranged on the asphalt inlet pipe;
2) Liquid asphalt is uniformly distributed to the upper tube plate of the 1 st liquid separation zone through a plurality of asphalt distribution tubes arranged on an asphalt inlet connecting tube, enters into each downcomer in a full-flow mode, forms uniform liquid film in each downcomer to flow downwards, exchanges heat with steam condensate of a shell side, and is collected into an asphalt storage tank corresponding to the lower part after reaching the required temperature; the vaporized steam condensate after heat exchange is cooled in a steam condenser through circulating cooling water, then is sent to a condensate water tank, and is pumped back to an asphalt falling film cooler through a condensate water pump for heat exchange;
3) The asphalt storage tank keeps a set liquid level, nitrogen back pressure introduced by the 1 st liquid dividing area is used as power for flowing out liquid asphalt and is pressed and conveyed to the next independent 2 nd liquid dividing area which is isolated by a tube plate baffle plate on the downcomer, and the liquid level displayed by a liquid level recording control instrument on the asphalt storage tank is kept constant through a flow regulating valve arranged on an asphalt outlet pipe; at this time, the actual flow of the asphalt outlet pipe is the same as the flow value displayed by the flow recording instrument on the asphalt inlet pipe, namely the outflow flow is equal to the inflow flow;
4) Liquid asphalt sent from an asphalt storage tank at the lower part of the 1 st liquid separation zone is uniformly distributed to an upper tube plate of the 2 nd liquid separation zone through a plurality of asphalt distribution tubes arranged on an asphalt inlet connecting tube of the 2 nd liquid separation zone, enters into each downcomer in a full-flow mode, forms a uniform liquid film in each downcomer to flow downwards, exchanges heat through steam condensate of the same shell pass as the 1 st liquid separation zone, and is collected into an asphalt storage tank corresponding to the lower part after reaching the required temperature;
5) The liquid level of the asphalt storage tank is kept at a set level, nitrogen back pressure introduced by the 2 nd liquid separation area is used as power for flowing out liquid asphalt and is pressed and conveyed to the next independent 3 rd liquid separation area which is isolated by a tube plate baffle plate on a downcomer, the liquid level displayed by a liquid level recording control instrument on the asphalt storage tank is kept constant through a flow regulating valve arranged on an asphalt outlet pipe, if liquid asphalt is loaded, a branch is added to the 2 nd liquid separation area corresponding to the liquid asphalt outflow pipeline of the asphalt storage tank for loading, and the temperature of the liquid asphalt loading cannot be too low, and is 250+/-20 ℃; the nitrogen back pressure of the nitrogen introduced into the 2 nd liquid dividing area is lower than that of the 1 st liquid dividing area, so that asphalt in the lower asphalt storage tank corresponding to the first liquid dividing area is pressed into the 2 nd liquid dividing area through the nitrogen back pressure;
6) Similarly, the operation principle and the mode of the operation from the 2 nd liquid division area to the 3 rd liquid division area, the operation from the 3 rd liquid division area to the 4 th liquid division area and the operation from the N-1 st liquid division area to the N liquid division area are the same as those of the operation from the 1 st liquid division area to the 2 nd liquid division area, and the asphalt backrest pressure of the lower asphalt storage tank corresponding to the N liquid division area is directly conveyed to the nozzle of the asphalt former in a pressing mode.
Compared with the prior art, the invention has the beneficial effects that:
1) The liquid receiving disc is independently partitioned by additionally arranging the partition plate at the upper tube plate of the asphalt falling film cooler, so that each partition is changed into a plurality of independent asphalt falling film coolers sharing the liquid-liquid heat exchanger, and the independent asphalt falling film coolers are operated in series through respective nitrogen back pressure, so that the height of a downcomer is successfully shortened, the appearance height of the equipment is successfully reduced under the condition that the temperature reduction temperature difference of the treated raw materials is large under the condition that one equipment is selected, and compared with the original scheme that a plurality of asphalt falling film coolers are required to be operated in series, the design is simplified, and the occupation of land, investment cost and operation cost of the equipment are saved.
2) After the scheme of the invention is adopted, the height of the equipment can be obviously reduced under the condition that the temperature reduction temperature difference is the same, or the diameter of the equipment is increased under the condition that the equipment height is the same, and the function of improving the temperature difference of asphalt temperature reduction can be achieved, so that the asphalt falling film cooler is suitable for various operation conditions, and the asphalt falling film cooler can be used easily.
Drawings
FIG. 1 is a schematic diagram of a multi-layer pitch falling film cooler according to the present invention.
FIG. 2 is a schematic illustration of the head space of the upper tube sheet of the present invention with 2 liquid separation zones.
FIG. 3 is a schematic illustration of the 3 liquid separation zones provided in the headspace of the upper tube sheet of the present invention.
FIG. 4 is a schematic illustration of 4 liquid partitions in the headspace of the upper tube sheet of the present invention.
FIG. 5 is a schematic structural view of the oversized-diameter multi-tube-layer pitch falling film cooler of the present invention.
Fig. 6 is a schematic and process diagram of the present invention.
In the figure: 1-pipe layer asphalt falling film cooler 2-primary heat exchange asphalt inlet pipe 3-secondary heat exchange asphalt inlet pipe 4-downcomer upper tube plate partition 5-modified asphalt distribution tube 6-downcomer 7-upper tube plate 8-lower tube plate 9-asphalt storage tank partition 101-top blind plate 111-bottom blind plate 102-flange connected top end enclosure 112-flange connected bottom end enclosure 12-first high pressure nitrogen inlet pipe 13-second high pressure nitrogen inlet pipe 14-primary heat exchange asphalt outlet pipe 15-secondary heat exchange asphalt outlet 16-steam condenser 17-condensate water tank 18-condensate water pump 19-first flow regulating valve 20-second flow regulating valve 21-first nitrogen self-supporting regulating valve 22-second nitrogen self-supporting regulating valve 23-former nozzle 24-first valve 25-second valve FR 01-flow recording instrument LRC 01-first liquid level recording regulating instrument LRC 02-second liquid level recording regulating instrument
Detailed Description
The following is a further description of embodiments of the invention, taken in conjunction with the accompanying drawings:
As shown in figures 1-5, the multi-layer asphalt falling film cooler can be used for medium-temperature asphalt, modified asphalt or other chemical raw materials with similar properties. The device comprises a downcomer liquid-liquid heat exchanger arranged at the upper part and an asphalt storage tank arranged at the lower part, wherein a plurality of downcomers 6 in the downcomer liquid-liquid heat exchanger are fixed through an upper tube plate 7 and a lower tube plate 8; the top of the asphalt falling film cooler is provided with an asphalt inlet connecting pipe, and the bottom is provided with an asphalt outlet. The top of the upper tube plate 7 is provided with a downcomer upper tube plate baffle plate 4 which divides the top space of the upper tube plate into 2-N independent liquid division areas, fig. 2 is a schematic diagram of the top space of the upper tube plate provided with 2 liquid division areas, fig. 3 is a schematic diagram of the top space of the upper tube plate provided with 3 liquid division areas, and fig. 4 is a schematic diagram of the top space of the upper tube plate provided with 4 liquid division areas.
The top of the asphalt falling film cooler corresponding to each liquid division area is respectively provided with a primary heat exchange asphalt inlet pipe 2, a secondary heat exchange asphalt inlet pipe 3, a first high-pressure nitrogen inlet pipe 12 and a second high-pressure nitrogen inlet pipe 13, each asphalt inlet connecting pipe extends to the center of the falling film cooler respectively, and the bottom of each asphalt inlet connecting pipe is longitudinally provided with a plurality of modified asphalt distribution pipes 5; the bottom of the lower tube plate 8 is provided with an asphalt storage tank partition plate 9 which divides the space of the asphalt storage tank into 2-N independent asphalt storage tanks, each asphalt storage tank is provided with a primary heat exchange asphalt outlet pipe 14 and a secondary heat exchange asphalt outlet pipe 15, and each asphalt storage tank corresponds to a liquid separation area at the top of each asphalt storage tank.
As shown in fig. 1, under normal conditions, the top of the liquid separation area and the lower part of the asphalt storage tank adopt blind plates as sealing heads, so that the equipment is convenient to disassemble and overhaul, the top of the liquid separation area is provided with a top blind plate 101, and the lower part of the asphalt storage tank is provided with a bottom blind plate 111. As shown in FIG. 5, if the diameter of the device is oversized and is larger than 1000mm, an elliptical seal head is adopted at the top of the liquid separation area and the lower part of the asphalt storage tank, the top of the liquid separation area is provided with a top seal head 102 connected with a flange, and the lower part of the asphalt storage tank is provided with a bottom seal head 112 connected with the flange.
As shown in fig. 6, an asphalt cooling molding system includes an asphalt heat exchanger 26, a multi-layer asphalt falling film cooler 1, a steam condenser 16, a condensate water tank 17, a condensate water pump 18, and a former nozzle 23.
Each liquid division area at the top of the multi-pipe layer asphalt falling film cooler 1 is respectively provided with a first high-pressure nitrogen inlet pipe 12, a second high-pressure nitrogen inlet pipe 13, a primary heat exchange asphalt inlet pipe 2 and a secondary heat exchange asphalt inlet pipe 3.
A flow recording instrument FR01 is arranged on the raw material asphalt inlet pipe; the upper part of the shell side of the downcomer liquid-liquid heat exchanger is provided with a steam outlet, the lower part is provided with a steam condensate inlet, the steam outlet is connected with the steam condensate inlet through an external circulating pipeline, and the external circulating pipeline is sequentially provided with a steam condenser 16, a condensate water tank 17 and a condensate water pump 18 along the flow direction of medium in the pipe.
Each liquid division area at the top is provided with a corresponding asphalt storage tank at the lower part, the bottom of each asphalt storage tank is provided with a primary heat exchange asphalt outlet pipe 14 and a secondary heat exchange asphalt outlet pipe 15, nitrogen introduced through the liquid division area at the top is used as back pressure to enable asphalt to be extruded out of the primary heat exchange asphalt outlet pipe 14 and the secondary heat exchange asphalt outlet pipe 15, each asphalt outlet pipe is provided with a flow regulating valve, namely a first flow regulating valve 19 and a second flow regulating valve 20, each asphalt storage tank is provided with a liquid level recording and regulating instrument, and the first liquid level recording and regulating instrument LRC01 and the second liquid level recording and regulating instrument LRC02.
According to the liquid level record regulating instrument of the corresponding asphalt storage tank, the flow rate of asphalt is automatically regulated, the tail end of the last asphalt outlet pipeline is connected with an asphalt former nozzle 23, and according to the temperature of each asphalt outlet pipeline, a liquid asphalt loading branch pipeline can be arranged in the middle of a certain asphalt outlet pipeline.
As shown in fig. 6, a process for cooling asphalt includes the steps of:
1) The liquid asphalt which is sent to the asphalt heat exchanger 26 for loading or shaping asphalt is firstly sent to the 1 st liquid dividing area of the multi-layer asphalt falling film cooler 1 after the asphalt heat exchanger 26 exchanges heat with tar and recovers certain heat, the upper tube plate 7 is equivalent to a liquid receiving disc, the upper tube plate is divided into 2-N independent liquid dividing areas by a partition plate, a flow recording instrument FR01 is arranged on a raw material asphalt inlet pipe, and the flow of the liquid asphalt is measured and recorded by the flow recording instrument FR01 arranged on a primary asphalt inlet pipe 2;
2) Liquid asphalt is uniformly distributed to the upper tube plate of the 1 st liquid separation zone through a plurality of asphalt distribution tubes 5 arranged on an asphalt inlet connecting tube, enters each downcomer 6 in a full-flow mode, forms uniform liquid film in each downcomer to flow downwards, exchanges heat with steam condensate of a shell side, and is collected into an asphalt storage tank corresponding to the lower part after reaching the required temperature; the vaporized steam condensate after heat exchange is cooled in a steam condenser 16 by circulating cooling water, then is sent to a condensate water tank 17, and is pumped back to the multi-pipe layer asphalt falling film cooler 1 by a condensate water pump 18 for heat exchange;
3) The asphalt storage tank keeps the set liquid level, nitrogen back pressure introduced by the 1 st liquid dividing area is used as power for flowing out liquid asphalt and is pressed to the next independent 2 nd liquid dividing area isolated by a tube plate baffle plate on the downcomer, and the liquid level displayed by a first liquid level recording and regulating instrument LRC01 on the asphalt storage tank is kept constant through a first flow regulating valve 19 arranged on an asphalt outlet pipe; at this time, the actual flow rate of the asphalt outlet pipe is the same as the flow rate value displayed by the flow rate recording instrument FR01 on the asphalt inlet pipe, namely the outflow flow rate is equal to the inflow flow rate;
4) Liquid asphalt sent from the asphalt storage tank at the lower part of the 1 st liquid separation zone is uniformly distributed to the upper tube plate of the 2 nd liquid separation zone through a plurality of asphalt distribution tubes 5 arranged on the asphalt inlet connecting tube 3 of the 2 nd liquid separation zone, enters into each downcomer in a full-flow mode, forms uniform liquid film in each downcomer to flow downwards, exchanges heat through steam condensate with the same shell pass as the 1 st liquid separation zone, and is collected into the corresponding asphalt storage tank at the lower part after reaching the required temperature;
5) The asphalt storage tank keeps the set liquid level, nitrogen back pressure introduced by the 2 nd liquid separation area is used as the power for flowing out the liquid asphalt, the nitrogen back pressure is pressed and conveyed to the next independent 3 rd liquid separation area which is isolated by a tube plate baffle plate on the downcomer, the liquid level displayed by a second liquid level recording and regulating instrument LRC02 on the asphalt storage tank is kept constant through a second flow regulating valve 20 arranged on an asphalt outlet pipe, if liquid asphalt is loaded, a branch is added to the 2 nd liquid separation area corresponding to a liquid asphalt outflow pipeline of the asphalt storage tank to load the liquid asphalt, because the loading temperature of the liquid asphalt cannot be too low, and is about 250 ℃; the nitrogen back pressure introduced into the 2 nd liquid dividing area is lower than that of the 1 st liquid dividing area, so that asphalt in the lower asphalt storage tank corresponding to the first liquid dividing area can be pressed into the 2 nd liquid dividing area through the nitrogen back pressure;
6) Similarly, the operation principle and the mode of the operation from the 2 nd liquid division area to the 3 rd liquid division area, the operation from the 3 rd liquid division area to the 4 th liquid division area, and the operation from the N-1 st liquid division area to the N th liquid division area are the same, and only the asphalt backrest pressure of the lower asphalt storage tank corresponding to the N liquid division area is directly conveyed to the asphalt former nozzle 23 in a pressing mode.
The liquid asphalt comprises modified asphalt or medium temperature asphalt.
In the above situation, in the case that the asphalt heat exchanger 26 cannot normally operate, for example, the heat exchanger is blocked and the efficiency is reduced or the operation and the shutdown period are shortened, all the N liquid separation areas need to operate, and in the case that the asphalt heat exchanger 26 can normally operate, only the 1 st liquid separation area and the 2 nd liquid separation area need to operate, so that the normal operation of the system can be ensured, and at the moment, the liquid asphalt feeding pipeline can be directly pressed to the asphalt former nozzle 23.
The following takes a double-tube layer asphalt falling film cooler and application thereof in a cooling process as an example, and is implemented on the premise of the technical scheme of the invention, and a detailed implementation mode and a specific operation process are given, but the protection scope of the invention is not limited to the following example. The methods used in the examples described below are conventional methods unless otherwise specified.
[ Example ]
In this embodiment, taking the example that 2 liquid separation areas with the same area are arranged at the top of the pipe layer asphalt falling film cooler 1, a specific process of loading or forming liquid asphalt after the liquid asphalt is cooled by the double pipe layer asphalt falling film cooler 1 is described.
As shown in fig. 1,2 and 5, the multi-layer asphalt falling film cooler can be used for medium-temperature asphalt, modified asphalt or other chemical raw materials with similar properties. The device comprises a downcomer liquid-liquid heat exchanger arranged at the upper part and an asphalt storage tank arranged at the lower part, wherein a plurality of downcomers 6 in the downcomer liquid-liquid heat exchanger are fixed through an upper tube plate 7 and a lower tube plate 8; the top of the asphalt falling film cooler is provided with an asphalt inlet connecting pipe, and the bottom is provided with an asphalt outlet; the top of the upper tube plate 7 is provided with a downcomer upper tube plate baffle plate 4 to divide the top space of the upper tube plate into 2 independent liquid separation areas, the top of the asphalt falling film cooler corresponding to each liquid separation area is respectively provided with a primary heat exchange asphalt inlet pipe 2, a secondary heat exchange asphalt inlet pipe 3, a first high-pressure nitrogen inlet pipe 12 and a second high-pressure nitrogen inlet pipe 13, each asphalt inlet connecting pipe extends to the center of the falling film cooler respectively, and the bottom of each asphalt inlet connecting pipe is longitudinally provided with a plurality of modified asphalt distribution pipes 5; an asphalt storage tank partition plate 9 is arranged at the bottom of the lower tube plate 8 to divide the space of the asphalt storage tank into 2 independent asphalt storage tanks, each asphalt storage tank is provided with a respective primary heat exchange asphalt outlet pipe 14 and a secondary heat exchange asphalt outlet pipe 15, and each asphalt storage tank corresponds to a liquid partition area at the top of each asphalt storage tank.
As shown in fig. 1, under normal conditions, the top of the liquid separation area and the lower part of the asphalt storage tank adopt blind plates as sealing heads, so that the equipment is convenient to disassemble and overhaul, the top of the liquid separation area is provided with a top blind plate 101, and the lower part of the asphalt storage tank is provided with a bottom blind plate 111. As shown in fig. 5, if the diameter of the device is oversized, an elliptical seal head is adopted at the top of the liquid division area and the lower part of the asphalt storage tank, the top of the liquid division area is provided with a top seal head 102 connected with a flange, and the lower part of the asphalt storage tank is provided with a bottom seal head 112 connected with the flange.
As shown in fig. 6, an asphalt cooling molding system includes an asphalt heat exchanger 26, a double-pipe layer asphalt falling film cooler 1, a steam condenser 16, a condensate water tank 17, a condensate water pump 18, and a former nozzle 23.
Each liquid division area at the top of the multi-pipe layer asphalt falling film cooler 1 is respectively provided with a first high-pressure nitrogen inlet pipe 12, a second high-pressure nitrogen inlet pipe 13, a primary heat exchange asphalt inlet pipe 2 and a secondary heat exchange asphalt inlet pipe 3.
A flow recording instrument FR01 is arranged on the raw material asphalt inlet pipe; the upper part of the shell side of the downcomer liquid-liquid heat exchanger is provided with a steam outlet, the lower part is provided with a steam condensate inlet, the steam outlet is connected with the steam condensate inlet through an external circulating pipeline, and the external circulating pipeline is sequentially provided with a steam condenser 16, a condensate water tank 17 and a condensate water pump 18 along the flow direction of medium in the pipe.
Each liquid division area at the top is provided with a corresponding asphalt storage tank at the lower part, the bottom of each asphalt storage tank is provided with a primary heat exchange asphalt outlet pipe 14 and a secondary heat exchange asphalt outlet pipe 15, nitrogen introduced through the liquid division area at the top is used as back pressure to enable asphalt to be extruded out of the primary heat exchange asphalt outlet pipe 14 and the secondary heat exchange asphalt outlet pipe 15, each asphalt outlet pipe is provided with a flow regulating valve, namely a first flow regulating valve 19 and a second flow regulating valve 20, each asphalt storage tank is provided with a liquid level recording and regulating instrument, and the first liquid level recording and regulating instrument LRC01 and the second liquid level recording and regulating instrument LRC02.
According to the liquid level record regulating instrument of the corresponding asphalt storage tank, the flow rate of asphalt is automatically regulated, the tail end of the last asphalt outlet pipeline is connected with an asphalt former nozzle 23, and according to the temperature of each asphalt outlet pipeline, a liquid asphalt loading branch pipeline can be arranged in the middle of a certain asphalt outlet pipeline.
As shown in fig. 6, a process for cooling asphalt includes the steps of:
1) The liquid asphalt which is sent to the asphalt liquid loading or asphalt molding is firstly sent to the asphalt heat exchanger 26, after the asphalt heat exchanger 26 exchanges heat with tar and recovers certain heat, the liquid asphalt enters the 1 st liquid division area of the double-layer asphalt falling film cooler 1, the upper tube plate 7 is equivalent to a liquid receiving disc, the liquid receiving disc is divided into 2 independent liquid division areas by a partition plate, a flow recording instrument FR01 is arranged on a raw material asphalt inlet pipe, the flow of the liquid asphalt is measured and recorded by the flow recording instrument FR01 arranged on a primary asphalt inlet pipe 2, and nitrogen enters the 1 st liquid division area by a first high-pressure nitrogen inlet pipe 12 after being regulated by a first nitrogen self-standing regulating valve 21;
2) Liquid asphalt is uniformly distributed to the upper tube plate of the 1 st liquid separation zone through a plurality of asphalt distribution tubes 5 arranged on an asphalt inlet connecting tube, enters each downcomer 6 in a full-flow mode, forms uniform liquid film in each downcomer to flow downwards, exchanges heat with steam condensate of a shell side, and is collected into an asphalt storage tank corresponding to the lower part after reaching the required temperature; the vaporized steam condensate after heat exchange is cooled in a steam condenser 16 by circulating cooling water, then is sent to a condensate water tank 17, and is pumped back to the asphalt falling film cooler by a condensate water pump 18 for heat exchange;
3) The asphalt storage tank keeps the set liquid level, nitrogen back pressure introduced by the 1st liquid dividing area is used as the power for flowing out liquid asphalt, the liquid level is pressed and conveyed to a secondary heat exchange asphalt inlet pipe 3 of the next independent 2 nd liquid dividing area isolated by a pipe plate baffle plate on a downcomer, and the liquid level displayed by a first liquid level recording and regulating instrument LRC01 on the asphalt storage tank is kept constant through a first flow regulating valve 19 arranged on an asphalt outlet pipe; at this time, the actual flow rate of the asphalt outlet pipe is the same as the flow rate value displayed by the flow rate recording instrument FR01 on the asphalt inlet pipe, namely the outflow flow rate is equal to the inflow flow rate;
4) The liquid asphalt sent from the asphalt storage tank at the lower part of the 1 st liquid dividing zone is sent out in two ways, one way is sent to the liquid asphalt to be loaded through a first valve 25, the other way is evenly distributed to the upper tube plate of the 2 nd liquid dividing zone through a second valve 24 and a plurality of asphalt distribution pipes 5 arranged on a secondary asphalt inlet connecting tube 3 of the 2 nd liquid dividing zone, and enters into each downcomer in a full flow mode, an even liquid film flows downwards in the downcomers, the liquid film exchanges heat through the steam condensate of the same shell pass as the 1 st liquid dividing zone, the liquid asphalt is collected into the corresponding asphalt storage tank at the lower part after reaching the required temperature, nitrogen enters into the 2 nd liquid dividing zone through a high-pressure nitrogen inlet pipe 13 after being regulated by a second nitrogen self-supporting regulating valve 22, and the nitrogen back pressure introduced into the 2 nd liquid dividing zone is lower than that of the 1 st liquid dividing zone, so that the asphalt of the asphalt storage tank at the lower part corresponding to the first liquid dividing zone can be pressed into the 2 nd liquid dividing zone through the nitrogen back pressure;
5) The asphalt storage tank keeps the set liquid level, the nitrogen back pressure introduced by the 2 nd liquid dividing area is used as the power for flowing out the liquid asphalt, the liquid pressure is sent to the nozzle 23 of the asphalt shaper, and the liquid level displayed by the liquid level recording control instrument LRC02 on the asphalt storage tank is kept constant through the second flow regulating valve 20 arranged on the asphalt outlet pipe.
According to the invention, the liquid receiving disc is independently partitioned by additionally arranging the partition plate at the upper tube plate of the asphalt falling film cooler, so that each partition is changed into a plurality of independent asphalt falling film coolers sharing the liquid-liquid heat exchanger, and the independent asphalt falling film coolers are operated in series through respective nitrogen back pressure, so that the height of a downcomer is successfully shortened, the appearance height of the equipment is successfully reduced under the condition that the temperature reduction temperature difference of the treated raw materials is large when the equipment is selected, and compared with the original scheme that a plurality of asphalt falling film coolers are required to be operated in series, the design is simplified, and the occupation area, investment cost and operation cost of the equipment are saved.
After the scheme of the invention is adopted, the height of the equipment can be obviously reduced under the condition that the temperature reduction temperature difference is the same, or the diameter of the equipment is increased under the condition that the equipment height is the same, and the function of improving the temperature difference of asphalt temperature reduction can be achieved, so that the asphalt falling film cooler is suitable for various operation conditions, and the asphalt falling film cooler can be used easily.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (1)
1. A process for cooling and forming asphalt,
The multi-tube layer asphalt falling film cooler comprises a downcomer liquid-liquid heat exchanger arranged at the upper part and an asphalt storage tank arranged at the lower part, wherein a plurality of downcomers in the downcomer liquid-liquid heat exchanger are fixed through an upper tube plate and a lower tube plate; the top of the asphalt falling film cooler is provided with an asphalt inlet connecting pipe, and the bottom is provided with an asphalt outlet; the multi-layer asphalt falling film cooler is characterized in that a partition plate is arranged at the top of an upper tube plate of the multi-layer asphalt falling film cooler to divide the top space of the upper tube plate into 2-N independent liquid separation areas, an asphalt inlet connecting pipe and a nitrogen inlet connecting pipe are respectively arranged at the top of the asphalt falling film cooler corresponding to each liquid separation area, each asphalt inlet connecting pipe extends towards the center of the falling film cooler, and a plurality of asphalt distribution pipes are longitudinally arranged at the bottom of each asphalt inlet connecting pipe; the bottom of the lower tube plate is provided with a baffle plate to divide the space of the asphalt storage tank into 2-N independent asphalt storage tanks, each asphalt storage tank is provided with a respective asphalt outlet pipe, and each asphalt storage tank corresponds to a liquid division area at the top of each asphalt storage tank;
The multi-layer asphalt falling film cooler can be used for medium-temperature asphalt, modified asphalt or other chemical raw materials with similar properties;
When the diameter of the multi-pipe layer asphalt falling film cooler is less than or equal to 1000mm, the top of the liquid separation area and the lower part of the asphalt storage tank adopt blind plates as sealing heads; when the diameter of the multi-pipe layer asphalt falling film cooler is more than 1000mm, the top of the liquid division area and the lower part of the asphalt storage tank should adopt an elliptical end socket;
The method is characterized by comprising the following steps of:
1) The asphalt liquid is sent to an asphalt heat exchanger, after the asphalt heat exchanger exchanges heat with tar and recovers certain heat, the asphalt heat exchanger enters a1 st liquid dividing area of an asphalt falling film cooler, an upper tube plate is equivalent to a liquid receiving disc, the upper tube plate is divided into 2-N independent liquid dividing areas through a partition plate, a flow recording instrument is arranged on a raw material asphalt inlet pipe, and the flow of the liquid asphalt is measured and recorded through the flow recording instrument arranged on the asphalt inlet pipe;
2) Liquid asphalt is uniformly distributed to the upper tube plate of the 1 st liquid separation zone through a plurality of asphalt distribution tubes arranged on an asphalt inlet connecting tube, enters into each downcomer in a full-flow mode, forms uniform liquid film in each downcomer to flow downwards, exchanges heat with steam condensate of a shell side, and is collected into an asphalt storage tank corresponding to the lower part after reaching the required temperature; the vaporized steam condensate after heat exchange is cooled in a steam condenser through circulating cooling water, then is sent to a condensate water tank, and is pumped back to an asphalt falling film cooler through a condensate water pump for heat exchange;
3) The asphalt storage tank keeps a set liquid level, nitrogen back pressure introduced by the 1 st liquid dividing area is used as power for flowing out liquid asphalt and is pressed and conveyed to the next independent 2 nd liquid dividing area which is isolated by a tube plate baffle plate on the downcomer, and the liquid level displayed by a liquid level recording control instrument on the asphalt storage tank is kept constant through a flow regulating valve arranged on an asphalt outlet pipe; at this time, the actual flow of the asphalt outlet pipe is the same as the flow value displayed by the flow recording instrument on the asphalt inlet pipe, namely the outflow flow is equal to the inflow flow;
4) Liquid asphalt sent from an asphalt storage tank at the lower part of the 1 st liquid separation zone is uniformly distributed to an upper tube plate of the 2 nd liquid separation zone through a plurality of asphalt distribution tubes arranged on an asphalt inlet connecting tube of the 2 nd liquid separation zone, enters into each downcomer in a full-flow mode, forms a uniform liquid film in each downcomer to flow downwards, exchanges heat through steam condensate of the same shell pass as the 1 st liquid separation zone, and is collected into an asphalt storage tank corresponding to the lower part after reaching the required temperature;
5) The liquid level of the asphalt storage tank is kept constant by a flow regulating valve arranged on an asphalt outlet pipe, and if liquid asphalt is loaded, the liquid level of the asphalt storage tank is kept constant by a liquid level recording control instrument, wherein the liquid level of the asphalt storage tank is kept constant by a flow regulating valve arranged on the asphalt outlet pipe, and a branch is added to the liquid asphalt outflow pipeline of the asphalt storage tank corresponding to the liquid separation zone of the 2 nd liquid separation zone; the nitrogen back pressure of the nitrogen introduced into the 2 nd liquid dividing area is lower than that of the 1 st liquid dividing area, so that asphalt in the lower asphalt storage tank corresponding to the first liquid dividing area is pressed into the 2 nd liquid dividing area through the nitrogen back pressure;
6) Similarly, the operation principle and the mode of the operation from the 2 nd liquid division area to the 3 rd liquid division area, the operation from the 3 rd liquid division area to the 4 th liquid division area and the operation from the N-1 st liquid division area to the N liquid division area are the same as those of the operation from the 1 st liquid division area to the 2 nd liquid division area, and the asphalt backrest pressure of the lower asphalt storage tank corresponding to the N liquid division area is directly conveyed to the nozzle of the asphalt former in a pressing mode.
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| CN201910906078.2A CN110551513B (en) | 2019-09-24 | 2019-09-24 | Multi-pipe layer asphalt falling film cooler and asphalt cooling forming process applied by same |
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| US6276442B1 (en) * | 1998-06-02 | 2001-08-21 | Electric Boat Corporation | Combined condenser/heat exchanger |
| RU2178324C2 (en) * | 1999-05-12 | 2002-01-20 | Салаватский филиал Уфимского государственного нефтяного технического университета | Film-type evaporator |
| CN110257095A (en) * | 2019-07-19 | 2019-09-20 | 中冶焦耐(大连)工程技术有限公司 | A kind of pitch falling film cooler and pitch are cooled and shaped system and technique |
| CN210856000U (en) * | 2019-09-24 | 2020-06-26 | 中冶焦耐(大连)工程技术有限公司 | Asphalt falling film cooler with multi-pipe layers |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US6276442B1 (en) * | 1998-06-02 | 2001-08-21 | Electric Boat Corporation | Combined condenser/heat exchanger |
| RU2178324C2 (en) * | 1999-05-12 | 2002-01-20 | Салаватский филиал Уфимского государственного нефтяного технического университета | Film-type evaporator |
| CN110257095A (en) * | 2019-07-19 | 2019-09-20 | 中冶焦耐(大连)工程技术有限公司 | A kind of pitch falling film cooler and pitch are cooled and shaped system and technique |
| CN210856000U (en) * | 2019-09-24 | 2020-06-26 | 中冶焦耐(大连)工程技术有限公司 | Asphalt falling film cooler with multi-pipe layers |
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