CN110551513A - Multi-pipe-layer asphalt falling film cooler and asphalt cooling forming process applying same - Google Patents
Multi-pipe-layer asphalt falling film cooler and asphalt cooling forming process applying same Download PDFInfo
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- CN110551513A CN110551513A CN201910906078.2A CN201910906078A CN110551513A CN 110551513 A CN110551513 A CN 110551513A CN 201910906078 A CN201910906078 A CN 201910906078A CN 110551513 A CN110551513 A CN 110551513A
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- asphalt
- liquid
- storage tank
- falling film
- pipe
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- 239000010426 asphalt Substances 0.000 title claims abstract description 416
- 239000011552 falling film Substances 0.000 title claims abstract description 85
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000001816 cooling Methods 0.000 title claims abstract description 20
- 239000007788 liquid Substances 0.000 claims abstract description 256
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 100
- 238000003860 storage Methods 0.000 claims abstract description 97
- 238000009826 distribution Methods 0.000 claims abstract description 58
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 50
- 238000005192 partition Methods 0.000 claims abstract description 25
- 238000000926 separation method Methods 0.000 claims description 55
- 230000001105 regulatory effect Effects 0.000 claims description 26
- 238000000465 moulding Methods 0.000 claims description 13
- 239000002994 raw material Substances 0.000 claims description 12
- 239000010408 film Substances 0.000 claims description 10
- 239000000498 cooling water Substances 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 14
- 238000010586 diagram Methods 0.000 description 6
- 239000011269 tar Substances 0.000 description 4
- 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
- 239000011280 coal tar Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011883 electrode binding agent Substances 0.000 description 1
- 239000007787 solid Substances 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)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Civil Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (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 forming process applied by the same. The top of an upper tube plate of the multi-tube-layer asphalt falling film cooler is provided with a partition plate to divide the top space of the upper tube plate into 2-N independent liquid distribution areas, the top of the asphalt falling film cooler corresponding to each liquid distribution area is respectively provided with an asphalt inlet connecting pipe and a nitrogen inlet connecting pipe, each asphalt inlet connecting pipe extends towards the center of the falling film cooler, and the bottom of each asphalt inlet connecting pipe is longitudinally provided with a plurality of asphalt distribution pipes; the bottom of the lower tube plate is provided with a partition plate which divides the space of the asphalt storage tank into 2-N independent asphalt storage tanks, each asphalt storage tank is provided with an asphalt outlet pipe, and each asphalt storage tank corresponds to a liquid distribution area at the top of the 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 forming process applied by the same.
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 in the electrolytic aluminum industry and preparing battery rods or electrode binders.
the medium temperature asphalt and modified asphalt products produced in China can be sold in a liquid loading mode or in a solid mode of asphalt solidification and cooling molding, but in any 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 and molding.
the cooling method is that the hot asphalt is sent to a falling film cooler after heat exchange by a heat exchanger before being loaded in a liquid asphalt truck, an asphalt-removing storage tank or an asphalt forming device, the falling film cooler exchanges heat with steam condensate to reach the required temperature, and then is sent to a truck and a nozzle of the asphalt storage tank or the asphalt forming device by nitrogen pressure, and the specific detailed process is as follows: the asphalt falling film cooler used at present is provided with a liquid-liquid heat exchanger on the upper part and an asphalt storage tank on the lower part, wherein a down-flow pipe of the upper heat exchanger is fixed by an upper fixed pipe plate and a lower fixed pipe plate, hot asphalt is uniformly distributed on the upper fixed pipe plate through an asphalt distribution pipe and enters each down-flow pipe in a full flow mode, a uniform liquid film is formed in each down-flow pipe to flow downwards, the hot asphalt is collected into the asphalt storage tank on the lower part after reaching the required temperature through heat exchange with a steam condensate of a shell pass, the asphalt storage tank needs to keep a certain liquid level, then the hot asphalt is pressurized to an asphalt storage tank or a nozzle of an asphalt forming device through nitrogen backpressure, and the vaporized steam condensate is cooled by a steam condenser through circulating cooling water and then returns to.
the asphalt falling film cooler is used as cooling equipment, the heat exchange effect is very good, but the asphalt falling film cooler has limitation, 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 improved, the height of the downcomers can only be improved, the appearance size of the asphalt falling film cooler is very large and even difficult to overcome, if a plurality of asphalt falling film coolers are connected in series, the occupied area is large, the process is complex, the investment is wasted, and the labor intensity is increased.
As mentioned above, in the cooling process of asphalt, heat exchange is often performed to recover heat before asphalt is sent to a falling film cooler, because the temperature of asphalt is very high before the asphalt is sent to the falling film cooler and is often close to 400 ℃ regardless of medium-temperature asphalt or modified asphalt, and because asphalt itself contains suspended matters and has the characteristic of high viscosity of a softening point, the heat exchange efficiency of an asphalt heat exchanger is gradually reduced along with the passage of time, even blocked, which is the biggest obstacle of the asphalt heat exchanger and can not be overcome basically, the design of the asphalt falling film cooler has very large cooling temperature difference margin capacity for the occurrence of various working conditions, and therefore, how to improve the cooling temperature difference of asphalt through a single device is a problem which needs to be solved urgently.
In summary, the diameter of the existing asphalt falling film cooler only solves the material handling capacity of the equipment, but cannot solve the temperature difference of the materials; the asphalt falling film cooler is generally thin and high in overall dimension, the 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 serially connecting a plurality of asphalt falling film coolers, and the mode of serially connecting a plurality of asphalt falling film coolers has the disadvantages of large occupied area, complex process and high cost.
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 forming process applied by 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 purpose, the invention adopts the following technical scheme:
The multi-pipe-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 pipe plate and a lower pipe plate; the top of the asphalt falling film cooler is provided with an asphalt inlet connecting pipe, and the bottom of the asphalt falling film cooler is provided with an asphalt outlet; the top of the upper tube plate of the asphalt falling film cooler with the multi-tube layer is provided with a partition plate to divide the top space of the upper tube plate into 2-N independent liquid distribution areas, the top of the asphalt falling film cooler corresponding to each liquid distribution area is respectively provided with an asphalt inlet connecting tube and a nitrogen inlet connecting tube, each asphalt inlet connecting tube extends towards the center of the falling film cooler, and the bottom of each asphalt inlet connecting tube is longitudinally provided with a plurality of asphalt distribution tubes; the bottom of the lower tube plate is provided with a partition plate which divides the space of the asphalt storage tank into 2-N independent asphalt storage tanks, each asphalt storage tank is provided with an asphalt outlet pipe, and each asphalt storage tank corresponds to a liquid distribution area at the top of the asphalt storage tank.
The multi-pipe-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, blind plates are adopted at the top of the liquid distribution area and the lower part of the asphalt storage tank as end sockets; when the diameter of the multi-pipe-layer asphalt falling film cooler is more than 1000mm, the top of the liquid separation area and the lower part of the asphalt storage tank are provided with elliptical seal heads.
an asphalt cooling forming process comprises the following steps:
1) The method comprises the following steps of (1) conveying liquid asphalt for asphalt liquid loading or asphalt molding to an asphalt heat exchanger, after the asphalt heat exchanger exchanges heat with tar and recovers certain heat, feeding the heat into a No. 1 liquid distribution area of an asphalt falling film cooler, wherein an upper pipe plate is equivalent to a liquid receiving plate and is divided into 2-N independent liquid distribution areas through partition plates, 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 on the upper pipe plate of the 1 st liquid distribution area through a plurality of asphalt distribution pipes arranged on an asphalt inlet connecting pipe, and enters each downcomer in a full flow mode, a uniform liquid film is formed in each downcomer and flows downwards, and the liquid asphalt is collected into an asphalt storage tank corresponding to the lower part after reaching the required temperature through heat exchange with the steam condensate of the shell side; the vaporized steam condensate after heat exchange is cooled in a steam condenser through circulating cooling water, then is sent to a condensate tank, and is pumped back to the asphalt falling film cooler through a condensate pump for heat exchange;
3) the asphalt storage tank keeps a set liquid level, the back pressure of nitrogen introduced through the 1 st liquid separation area is used as the power for the liquid asphalt to flow out, the nitrogen is pumped to the next independent 2 nd liquid separation area isolated by the partition plate of the upper tube plate of 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 delivered from an asphalt storage tank at the lower part of the 1 st liquid distribution area is uniformly distributed on an upper pipe plate of the 2 nd liquid distribution area through a plurality of asphalt distribution pipes arranged on an asphalt inlet connecting pipe of the 2 nd liquid distribution area, and enters each downcomer in a full flow mode, a uniform liquid film is formed in each downcomer and flows downwards, and the liquid asphalt is collected into an asphalt storage tank corresponding to the lower part after reaching the required temperature through heat exchange of steam condensate with the same shell pass as that of the 1 st liquid distribution area;
5) the asphalt storage tank keeps a set liquid level, the back pressure of nitrogen introduced through the 2 nd liquid separation area is used as the power of the outflow of liquid asphalt, the liquid is pumped to the next independent 3 rd liquid separation area isolated by the partition plate of the upper tube plate of the 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 a liquid asphalt outflow pipeline of the asphalt storage tank in the 2 nd liquid separation area to load the liquid asphalt, because the temperature of the liquid asphalt loading cannot be too low, the temperature is 250 +/-20 ℃; the back pressure of nitrogen introduced into the 2 nd liquid separation area is lower than that of the 1 st liquid separation area, so that asphalt in the lower asphalt storage tank corresponding to the first liquid separation area is pressed into the 2 nd liquid separation area through the nitrogen back pressure;
6) In the same way, the operation from the liquid division area 2 to the liquid division area 3, from the liquid division area 3 to the liquid division area 4, from the liquid division area N-1 to the liquid division area N is the same as the operation principle and mode from the liquid division area 1 to the liquid division area 2, and the asphalt back pressure of the lower asphalt storage tank corresponding to the liquid division area N is directly pressed and sent to the nozzle of the asphalt forming device.
Compared with the prior art, the invention has the beneficial effects that:
1) The partition plates are additionally arranged at the tube plates of the asphalt falling film cooler to independently partition the liquid receiving disc, 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 connected in series through respective nitrogen back pressures, the height of a down-flow pipe is successfully shortened, the appearance height of equipment is successfully reduced under the condition that the temperature difference of the treated raw materials is large and the equipment needs to be reduced, compared with the original scheme that a plurality of asphalt falling film coolers are required to be connected in series, the design is simplified, and the occupied area of the equipment, the investment cost and the operation cost 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 difference of the asphalt falling film cooler is the same, or the diameter of the equipment is increased under the condition that the height of the equipment is the same, and the function of improving the temperature difference of asphalt falling can also be achieved, so that the asphalt falling film cooler can be suitable for various operating conditions, and the asphalt falling film cooler can be used with great care.
drawings
FIG. 1 is a schematic structural view of a multi-tube layer pitch falling film cooler of the present invention.
Fig. 2 is a schematic diagram of the upper tube sheet headspace with 2 liquid separation zones according to the present invention.
FIG. 3 is a schematic view of the upper tubesheet headspace of the present invention having 3 liquid separation zones.
Fig. 4 is a schematic illustration of the upper tube sheet headspace with 4 liquid separation zones according to the present invention.
FIG. 5 is a schematic structural diagram of an oversized-diameter multi-tube layer pitch falling-film cooler according to the present invention.
FIG. 6 is a schematic diagram of the structure and process of the present invention.
In the figure: 1-tube layer asphalt falling film cooler 2-primary heat exchange asphalt inlet tube 3-secondary heat exchange asphalt inlet tube 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-top end enclosure 112 connected with flange-bottom end enclosure 12 connected with flange-first high-pressure nitrogen inlet tube 13-second high-pressure nitrogen inlet tube 14-primary heat exchange asphalt outlet tube 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-standing regulating valve 22-second nitrogen self-standing regulating valve 23- Former nozzle 24-first valve 25-second valve FR 01-flow registering instrument LRC 01-first level registering regulating instrument LRC 02-second level registering regulating instrument
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings:
As shown in fig. 1-5, a multi-layer asphalt falling film cooler can be used for medium-temperature asphalt, modified asphalt, or other chemical raw materials with similar properties. The asphalt storage tank is arranged at the lower part, and 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 of the asphalt falling film cooler is provided with an asphalt outlet. The top of the upper tube plate 7 is provided with a downcomer and an upper tube plate clapboard 4 to divide the top space of the upper tube plate into 2-N independent liquid distribution areas, fig. 2 is a schematic diagram of the upper tube plate provided with 2 liquid distribution areas in the top space, fig. 3 is a schematic diagram of the upper tube plate provided with 3 liquid distribution areas in the top space, and fig. 4 is a schematic diagram of the upper tube plate provided with 4 liquid distribution areas in the top space.
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 are respectively arranged at the top of the asphalt falling film cooler corresponding to each liquid distribution area, each asphalt inlet connecting pipe extends towards the center of the falling film cooler, and a plurality of modified asphalt distribution pipes 5 are longitudinally arranged at the bottom of each asphalt inlet connecting pipe; the bottom of the lower tube plate 8 is provided with an asphalt storage tank partition plate 9 to divide 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 distribution area on the top of the asphalt storage tank.
As shown in fig. 1, under normal conditions, blind plates are adopted at the top of the liquid separation zone and the lower part of the asphalt storage tank as end sockets, so that the equipment is convenient to disassemble and maintain, a top blind plate 101 is arranged at the top of the liquid separation zone, and a bottom blind plate 111 is arranged at the lower part of the asphalt storage tank. As shown in fig. 5, if the diameter of the equipment is too large and is greater than 1000mm, the top of the liquid separation region and the lower part of the asphalt storage tank should be elliptical heads, the top of the liquid separation region is provided with a top head 102 connected with a flange, and the lower part of the asphalt storage tank is provided with a bottom head 112 connected with the flange.
As shown in fig. 6, an asphalt cooling molding system includes an asphalt heat exchanger 26, a multi-pipe asphalt falling film cooler 1, a steam condenser 16, a condensed water tank 17, a condensed water pump 18 and a molding nozzle 23.
Each liquid separation area on 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 liquid-liquid heat exchanger of the downcomer is provided with a steam outlet, the lower part of the liquid-liquid heat exchanger 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 flowing direction of the medium in the tube.
Each liquid separating 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 separating area at the top is used as backpressure, so that asphalt is extruded from the primary heat exchange asphalt outlet pipe 14 and the secondary heat exchange asphalt outlet pipe 15, each asphalt outlet pipeline 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 a first liquid level recording and regulating instrument LRC01 and a second liquid level recording and regulating instrument LRC 02.
The flow of the asphalt is automatically adjusted by the adjusting instrument according to the liquid level record of the corresponding asphalt storage tank, the tail end of the last asphalt outlet pipeline is connected with an asphalt former nozzle 23, and a liquid asphalt loading branch pipeline can be arranged on one asphalt outlet pipe in the middle according to the temperature of each outlet pipe of the asphalt.
As shown in fig. 6, an asphalt cooling molding process includes the following steps:
1) The liquid asphalt for asphalt liquid loading or asphalt molding is firstly sent to an asphalt heat exchanger 26, the asphalt heat exchanger 26 exchanges heat with tar to recover certain heat, and then enters a No. 1 liquid distribution area of a multi-pipe-layer asphalt falling film cooler 1, an upper pipe plate 7 is equivalent to a liquid receiving disc and is divided into 2-N independent liquid distribution areas by partition plates, a raw material asphalt inlet pipe is provided with a flow recording instrument FR01, and the flow of the liquid asphalt is measured and recorded by a flow recording instrument FR01 arranged on a primary asphalt inlet pipe 2;
2) Liquid asphalt is uniformly distributed on an upper pipe plate of a 1 st liquid distribution area through a plurality of asphalt distribution pipes 5 arranged on an asphalt inlet connecting pipe, and enters each downcomer 6 in a full flow mode, so that uniform liquid films are formed in the downcomers to flow downwards, and the liquid asphalt is collected into an asphalt storage tank corresponding to the lower part after reaching the required temperature through heat exchange with a steam condensate of a shell side; the steam condensate vaporized after heat exchange is cooled in a steam condenser 16 through 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 through a condensate water pump 18 for heat exchange;
3) the asphalt storage tank keeps a set liquid level, the back pressure of nitrogen introduced through the first liquid separation area is used as the power for the liquid asphalt to flow out, the nitrogen is pumped to the next independent liquid separation area 2 separated by the partition plate on the upper tube plate of the downcomer, and the liquid level displayed by a first liquid level recording and adjusting instrument LRC01 on the asphalt storage tank is kept constant through a first flow adjusting 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 delivered from an asphalt storage tank at the lower part of the 1 st liquid distribution area is uniformly distributed on an upper pipe plate of the 2 nd liquid distribution area through a plurality of asphalt distribution pipes 5 arranged on an asphalt inlet connecting pipe 3 of the 2 nd liquid distribution area, and enters each downcomer in a full flow mode, a uniform liquid film is formed in each downcomer and flows downwards, and the liquid asphalt is collected into an asphalt storage tank corresponding to the lower part after the liquid asphalt reaches the required temperature through heat exchange of steam condensate with the same shell pass as that of the 1 st liquid distribution area;
5) The asphalt storage tank keeps a set liquid level, the back pressure of nitrogen introduced through the 2 nd liquid separation area is used as the power of the liquid asphalt flowing out, the nitrogen is pumped to the next independent 3 rd liquid separation area separated by the partition plate of the upper tube plate of the downcomer, the liquid level displayed by a second liquid level recording and adjusting instrument LRC02 on the asphalt storage tank is kept constant through a second flow adjusting valve 20 arranged on an asphalt outlet pipe, if liquid asphalt is loaded, a branch is added to the liquid asphalt outflow pipeline of the asphalt storage tank corresponding to the 2 nd liquid separation area to load the liquid asphalt, because the temperature of the liquid asphalt is not too low, about 250 ℃; the back pressure of nitrogen introduced into the 2 nd liquid separation area is lower than that of the 1 st liquid separation area, so that the asphalt in the lower asphalt storage tank corresponding to the first liquid separation area can be pressed into the 2 nd liquid separation area through the nitrogen back pressure;
6) similarly, the operation from the liquid separating region 2 to the liquid separating region 3, the liquid separating region 3 to the liquid separating region 4, and the operation from the liquid separating region N-1 to the liquid separating region N are the same as the operation principle and mode from the liquid separating region 1 to the liquid separating region 2, except that the asphalt back pressure of the lower asphalt storage tank corresponding to the liquid separating region N is directly pressed to the asphalt forming device nozzle 23.
The liquid asphalt comprises modified asphalt or moderate temperature asphalt.
The above situation is that under the condition that the asphalt heat exchanger 26 cannot normally operate, such as the blockage efficiency of the heat exchanger is reduced or the start-up and shutdown period, all the N liquid distribution areas need to operate, and under the condition that the asphalt heat exchanger 26 can normally operate, only the 1 st liquid distribution area and the 2 nd liquid distribution area need to operate, so that the normal operation of the system can be ensured, and at the moment, the liquid asphalt is sent to a loading pipeline and can be directly sent to the asphalt former nozzle 23 under pressure.
the following is an example of a double-tube pitch falling film cooler and its application in a cooling process, and the detailed embodiments and specific operation procedures are given on the premise of the technical scheme of the present invention, but the scope of the present invention is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.
[ examples ] A method for producing a compound
In this embodiment, a specific process of loading or molding liquid asphalt after cooling the liquid asphalt in the double-pipe-layer asphalt falling film cooler 1 is described by taking 2 liquid-separating regions with the same area on the top of the pipe-layer asphalt falling film cooler 1 as an example.
As shown in fig. 1, fig. 2 and fig. 5, the multi-pipe-layer asphalt falling film cooler can be used for medium-temperature asphalt, modified asphalt or other chemical raw materials with similar properties. The asphalt storage tank is arranged at the lower part, and 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 of the asphalt falling film cooler is provided with an asphalt outlet; the top of the upper tube plate 7 is provided with a downcomer, an upper tube plate partition plate 4 divides the top space of the upper tube plate into 2 independent liquid distribution areas, the top of the asphalt falling film cooler corresponding to each liquid distribution area is respectively provided with a primary heat exchange asphalt inlet tube 2, a secondary heat exchange asphalt inlet tube 3, a first high-pressure nitrogen inlet tube 12 and a second high-pressure nitrogen inlet tube 13, each asphalt inlet connecting tube extends towards the center of the falling film cooler, and the bottom of each asphalt inlet connecting tube is longitudinally provided with a plurality of modified asphalt distribution tubes 5; and an asphalt storage tank partition plate 9 is arranged at the bottom of the lower tube plate 8 to divide the asphalt storage tank into 2 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 distribution area at the top of the asphalt storage tank.
As shown in fig. 1, under normal conditions, blind plates are adopted at the top of the liquid separation zone and the lower part of the asphalt storage tank as end sockets, so that the equipment is convenient to disassemble and maintain, a top blind plate 101 is arranged at the top of the liquid separation zone, and a bottom blind plate 111 is arranged at the lower part of the asphalt storage tank. As shown in fig. 5, if the diameter of the equipment is too large, the top of the liquid separation zone and the lower part of the asphalt storage tank should be elliptical heads, the top of the liquid separation zone is provided with a top head 102 connected with a flange, and the lower part of the asphalt storage tank is provided with a bottom head 112 connected with a flange.
as shown in fig. 6, an asphalt cooling molding system includes an asphalt heat exchanger 26, a double-pipe asphalt falling film cooler 1, a steam condenser 16, a condensed water tank 17, a condensed water pump 18 and a molding nozzle 23.
Each liquid separation area on 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 liquid-liquid heat exchanger of the downcomer is provided with a steam outlet, the lower part of the liquid-liquid heat exchanger 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 flowing direction of the medium in the tube.
Each liquid separating 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 separating area at the top is used as backpressure, so that asphalt is extruded from the primary heat exchange asphalt outlet pipe 14 and the secondary heat exchange asphalt outlet pipe 15, each asphalt outlet pipeline 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 a first liquid level recording and regulating instrument LRC01 and a second liquid level recording and regulating instrument LRC 02.
The flow of the asphalt is automatically adjusted by the adjusting instrument according to the liquid level record of the corresponding asphalt storage tank, the tail end of the last asphalt outlet pipeline is connected with an asphalt former nozzle 23, and a liquid asphalt loading branch pipeline can be arranged on one asphalt outlet pipe in the middle according to the temperature of each outlet pipe of the asphalt.
as shown in fig. 6, an asphalt cooling molding process includes the following steps:
1) The liquid asphalt for asphalt liquid loading or asphalt molding is firstly sent to an asphalt heat exchanger 26, the asphalt heat exchanger 26 exchanges heat with tar to recover certain heat and then enters a 1 st liquid separation area of a double-pipe asphalt falling film cooler 1, an upper pipe plate 7 is equivalent to a liquid receiving disc and is divided into 2 independent liquid separation areas through a partition plate, a raw material asphalt inlet pipe is provided with a flow recording instrument FR01, the flow of the liquid asphalt is measured and recorded through a flow recording instrument FR01 arranged on a primary asphalt inlet pipe 2, and nitrogen enters the 1 st liquid separation area through a first high-pressure nitrogen inlet pipe 12 after being regulated by a first nitrogen self-supporting regulating valve 21;
2) Liquid asphalt is uniformly distributed on an upper pipe plate of a 1 st liquid distribution area through a plurality of asphalt distribution pipes 5 arranged on an asphalt inlet connecting pipe, and enters each downcomer 6 in a full flow mode, so that uniform liquid films are formed in the downcomers to flow downwards, and the liquid asphalt is collected into an asphalt storage tank corresponding to the lower part after reaching the required temperature through heat exchange with a steam condensate of a shell side; the steam condensate vaporized after heat exchange is cooled in a steam condenser 16 through circulating cooling water, then is sent to a condensate water tank 17, and is pumped back to the asphalt falling film cooler through a condensate water pump 18 for heat exchange;
3) The asphalt storage tank keeps a set liquid level, the back pressure of nitrogen introduced through the first liquid separation area is used as the power for the liquid asphalt to flow out, the nitrogen is pumped to the secondary heat exchange asphalt inlet pipe 3 of the next independent liquid separation area 2 separated by the partition plate on the upper tube plate of the downcomer, and the liquid level displayed by a first liquid level recording and adjusting instrument LRC01 on the asphalt storage tank is kept constant through a first flow adjusting 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 by the asphalt storage tank at the lower part of the 1 st liquid separating area is sent out in two paths, one path of the liquid asphalt is sent to a truck through a first valve 25, the other path of the liquid asphalt is evenly distributed on the upper tube plate of the 2 nd liquid separating area through a second valve 24 and a plurality of asphalt distributing tubes 5 arranged on a secondary asphalt inlet connecting tube 3 of the 2 nd liquid separating area and enters each downcomer in a full flow mode, a uniform liquid film is formed in the downcomer and flows downwards, and the liquid film is collected into a corresponding asphalt storage tank at the lower part after reaching the required temperature through heat exchange of steam condensate with the same shell pass as the 1 st liquid separation area, the nitrogen enters the 2 nd liquid separation area through a high-pressure nitrogen inlet pipe 13 after being regulated by a second nitrogen self-standing regulating valve 22, the back pressure of the nitrogen introduced into the 2 nd liquid separation area is lower than that of the nitrogen introduced into the 1 st liquid separation area, therefore, the asphalt in the lower asphalt storage tank corresponding to the first liquid separation area can be pressed into the 2 nd liquid separation area through the nitrogen back pressure;
5) The asphalt storage tank keeps the set liquid level, the back pressure of nitrogen introduced through the 2 nd liquid separation area is used as the power for the liquid asphalt to flow out, the liquid asphalt is pumped to the nozzle 23 of the asphalt former, and the liquid level displayed by a liquid level recording control instrument LRC02 on the asphalt storage tank is kept constant through a flow control valve II 20 arranged on an asphalt outlet pipe.
The invention adds the clapboard at the upper tube plate of the asphalt falling film cooler to independently divide the liquid receiving disc, so that each division 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 connected in series through respective nitrogen back pressure, the height of the downcomer is successfully shortened, the appearance height of the asphalt falling film cooler is successfully reduced under the condition that the temperature difference of the processed raw materials is large, and the appearance height of the equipment is successfully reduced under the condition that one equipment is selected.
after the scheme of the invention is adopted, the height of the equipment can be obviously reduced under the condition that the temperature difference of the asphalt falling film cooler is the same, or the diameter of the equipment is increased under the condition that the height of the equipment is the same, and the function of improving the temperature difference of asphalt falling can also be achieved, so that the asphalt falling film cooler can be suitable for various operating conditions, and the asphalt falling film cooler can be used with great care.
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 (4)
1. The multi-pipe-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 pipe plate and a lower pipe plate; the top of the asphalt falling film cooler is provided with an asphalt inlet connecting pipe, and the bottom of the asphalt falling film cooler is provided with an asphalt outlet; the asphalt falling film cooler is characterized in that a partition plate is arranged at the top of an upper tube plate of the multi-tube-layer asphalt falling film cooler to divide the top space of the upper tube plate into 2-N independent liquid distribution 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 distribution area, each asphalt inlet connecting pipe extends towards the center of the falling film cooler, and a plurality of asphalt distribution tubes are longitudinally arranged at the bottom of each asphalt inlet connecting pipe; the bottom of the lower tube plate is provided with a partition plate which divides the space of the asphalt storage tank into 2-N independent asphalt storage tanks, each asphalt storage tank is provided with an asphalt outlet pipe, and each asphalt storage tank corresponds to a liquid distribution area at the top of the asphalt storage tank.
2. the multi-tube-layer asphalt falling film cooler according to claim 1, wherein the multi-tube-layer asphalt falling film cooler can be used for medium-temperature asphalt, modified asphalt or other chemical raw materials with similar properties.
3. The multi-pipe-layer asphalt falling film cooler of claim 1, wherein when the diameter of the multi-pipe-layer asphalt falling film cooler is less than or equal to 1000mm, blind plates are adopted as end sockets at the top of the liquid separation zone and at the lower part of the asphalt storage tank; when the diameter of the multi-pipe-layer asphalt falling film cooler is more than 1000mm, the top of the liquid separation area and the lower part of the asphalt storage tank are provided with elliptical seal heads.
4. An asphalt cooling forming process based on the cooler of claim 1, which is characterized by comprising the following steps:
1) The method comprises the following steps of (1) conveying liquid asphalt for asphalt liquid loading or asphalt molding to an asphalt heat exchanger, after the asphalt heat exchanger exchanges heat with tar and recovers certain heat, feeding the heat into a No. 1 liquid distribution area of an asphalt falling film cooler, wherein an upper pipe plate is equivalent to a liquid receiving plate and is divided into 2-N independent liquid distribution areas through partition plates, 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 on the upper pipe plate of the 1 st liquid distribution area through a plurality of asphalt distribution pipes arranged on an asphalt inlet connecting pipe, and enters each downcomer in a full flow mode, a uniform liquid film is formed in each downcomer and flows downwards, and the liquid asphalt is collected into an asphalt storage tank corresponding to the lower part after reaching the required temperature through heat exchange with the steam condensate of the shell side; the vaporized steam condensate after heat exchange is cooled in a steam condenser through circulating cooling water, then is sent to a condensate tank, and is pumped back to the asphalt falling film cooler through a condensate pump for heat exchange;
3) The asphalt storage tank keeps a set liquid level, the back pressure of nitrogen introduced through the 1 st liquid separation area is used as the power for the liquid asphalt to flow out, the nitrogen is pumped to the next independent 2 nd liquid separation area isolated by the partition plate of the upper tube plate of 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 delivered from an asphalt storage tank at the lower part of the 1 st liquid distribution area is uniformly distributed on an upper pipe plate of the 2 nd liquid distribution area through a plurality of asphalt distribution pipes arranged on an asphalt inlet connecting pipe of the 2 nd liquid distribution area, and enters each downcomer in a full flow mode, a uniform liquid film is formed in each downcomer and flows downwards, and the liquid asphalt is collected into an asphalt storage tank corresponding to the lower part after reaching the required temperature through heat exchange of steam condensate with the same shell pass as that of the 1 st liquid distribution area;
5) The asphalt storage tank keeps a set liquid level, the back pressure of nitrogen introduced through the 2 nd liquid separation area is used as the power for the liquid asphalt to flow out, the nitrogen is pumped to the next independent 3 rd liquid separation area separated by the partition plate of the upper tube plate of the 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, and if liquid asphalt is loaded, a branch is added to a liquid asphalt outflow pipeline of the asphalt storage tank in the 2 nd liquid separation area for loading the liquid asphalt; the back pressure of nitrogen introduced into the 2 nd liquid separation area is lower than that of the 1 st liquid separation area, so that asphalt in the lower asphalt storage tank corresponding to the first liquid separation area is pressed into the 2 nd liquid separation area through the nitrogen back pressure;
6) in the same way, the operation from the liquid division area 2 to the liquid division area 3, from the liquid division area 3 to the liquid division area 4, from the liquid division area N-1 to the liquid division area N is the same as the operation principle and mode from the liquid division area 1 to the liquid division area 2, and the asphalt back pressure of the lower asphalt storage tank corresponding to the liquid division area N is directly pressed and sent to the nozzle of the asphalt forming device.
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| CN110903840A (en) * | 2019-12-23 | 2020-03-24 | 中冶焦耐(大连)工程技术有限公司 | Asphalt forming process and device |
| CN111218295A (en) * | 2020-03-06 | 2020-06-02 | 中冶焦耐(大连)工程技术有限公司 | Gas forward circulation falling film cooling method and device |
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| CN111218295B (en) * | 2020-03-06 | 2024-01-30 | 中冶焦耐(大连)工程技术有限公司 | Gas forward circulation falling film cooling method and device |
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| CN110551513B (en) | 2024-04-26 |
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