CN211601640U - Double-tube-plate double-tube-layer asphalt falling film cooler and cooling system thereof - Google Patents
Double-tube-plate double-tube-layer asphalt falling film cooler and cooling system thereof Download PDFInfo
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- CN211601640U CN211601640U CN201922176210.7U CN201922176210U CN211601640U CN 211601640 U CN211601640 U CN 211601640U CN 201922176210 U CN201922176210 U CN 201922176210U CN 211601640 U CN211601640 U CN 211601640U
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Abstract
The utility model relates to an asphalt production and deep processing technical field especially relate to a double-barrelled layer pitch falling film cooler of double-tube sheet and cooling system thereof. The device comprises a shell, a 1 st tube layer tube plate and a downcomer, wherein the 1 st tube layer tube plate is divided into a 1 st tube layer upper tube plate and a 1 st tube layer lower tube plate; a 1 st liquid separation area is arranged above the tube plate on the 1 st tube layer, and is provided with a first high-pressure nitrogen inlet tube and a primary heat exchange asphalt inlet tube, and a 2 nd liquid separation area is arranged above the tube plate on the 2 nd tube layer and is provided with a second high-pressure nitrogen inlet tube and a secondary heat exchange asphalt inlet tube; the downcomer is respectively fixed by the tube plate of the 1 st tube layer and the tube plate of the 2 nd tube layer. The height of the equipment is reduced, the design is simplified, and the occupied area, investment cost and operation cost of the equipment are saved.
Description
Technical Field
The utility model relates to an asphalt production and deep processing technical field especially relate to a double-barrelled layer pitch falling film cooler of double-tube sheet and cooling system thereof.
Background
About 50 to 60 percent of medium temperature pitch is generally generated in the coal tar processing process, belongs to a bulk product of tar processing, and modified pitch is a main downstream product of the current medium temperature pitch and is mainly used for producing prebaked anodes 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, an asphalt storage tank on the lower part, a down-flow pipe of the upper heat exchanger is fixed by a pair of upper and lower fixed pipe plates, hot asphalt is uniformly distributed on the upper fixed pipe plates by 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 is kept at a certain liquid level so as to ensure that the flow of inlet and outlet asphalt is the same, then the hot asphalt is pressurized to a nozzle of an asphalt storage tank or an asphalt forming device through nitrogen backpressure, and the vaporized steam condensate is cooled by a circulating cooling water in a steam.
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 thin and high, the height 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 currently used asphalt falling film cooler only solves the material handling capacity of the equipment but cannot solve the temperature difference of the materials, the overall dimension of the asphalt falling film cooler is usually thin and high, the temperature difference of the materials can be solved by using the diameter of the equipment, the problem of large heat exchange temperature difference can be solved by a single device with normal equipment height instead of the mode of connecting a plurality of asphalt falling film coolers in series, and a large amount of cost and occupied area are saved.
SUMMERY OF THE UTILITY MODEL
In order to overcome the not enough of prior art, the utility model provides a double-tube-sheet double-tube layer pitch falling film cooler and cooling system thereof has successfully solved the big difficult problem of the heat transfer difference in temperature that two pitch falling film cooler series operation could solve, has reduced the height of equipment, has simplified the design, has saved equipment area, investment cost and running cost, and manufacturing is also very simple.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the asphalt falling film cooler with double tube plates and double tube layers comprises a shell, a tube plate of a 1 st tube layer and a downcomer, wherein the tube plate of the 1 st tube layer is divided into an upper tube plate of the 1 st tube layer and a lower tube plate of the 1 st tube layer; a 1 st liquid separation area is arranged above the tube plate on the 1 st tube layer, and is provided with a first high-pressure nitrogen inlet tube and a primary heat exchange asphalt inlet tube, and a 2 nd liquid separation area is arranged above the tube plate on the 2 nd tube layer and is provided with a second high-pressure nitrogen inlet tube and a secondary heat exchange asphalt inlet tube; the downcomer is respectively fixed by the tube plate of the 1 st tube layer and the tube plate of the 2 nd tube layer.
And the primary heat exchange asphalt inlet pipe and the secondary heat exchange asphalt inlet pipe are both provided with a plurality of asphalt distribution pipes.
And a steam outlet pipe is arranged at the upper part of the shell between the 2 nd tube layer upper tube plate and the 1 st tube layer lower tube plate, and a steam condensate inlet pipe is arranged at the lower part of the shell.
The 1 st liquid separating area corresponds to the asphalt storage tank on the upper part and is provided with a primary heat exchange asphalt outlet pipe; the 2 nd liquid separating area is corresponding to the asphalt storage tank below and is provided with a secondary heat exchange asphalt outlet pipe.
The pipeline connected with the primary heat exchange asphalt outlet pipe is provided with a first flow regulating valve, the pipeline connected with the secondary heat exchange asphalt outlet pipe is provided with a second flow regulating valve, the upper asphalt storage tank is provided with a first liquid level recording and regulating instrument, and the lower asphalt storage tank is provided with a second liquid level recording and regulating instrument.
A nitrogen self-supporting regulating valve I is arranged on a pipeline connected with the first high-pressure nitrogen inlet pipe; and a nitrogen self-supporting regulating valve II is arranged on a pipeline connected with the second high-pressure nitrogen inlet pipe.
A cooling system comprises a double-tube-plate double-tube-layer asphalt falling film cooler, a steam condenser, a condensed water tank and a condensed water pump; a water vapor outlet pipe of the double-pipe-plate double-pipe-layer asphalt falling film cooler is connected with a steam condensate inlet pipe through an external circulating pipeline, and the external circulating pipeline is sequentially provided with a steam condenser, a condensate water tank and a condensate water pump along the flowing direction of a medium in the pipe.
Compared with the prior art, the beneficial effects of the utility model are that:
1) on the basis of an original pair of upper tube plate and lower tube plate of the asphalt falling film cooler, a pair of upper tube plate and lower tube plate is added, so that the original asphalt falling film cooler is changed into a double-tube-layer heat exchanger from a single-tube-layer heat exchanger, which is equivalent to two independent asphalt falling film coolers sharing a liquid-liquid heat exchanger, and the two independent asphalt falling film coolers are successfully connected in series through respective nitrogen back pressure, so that the height of a down-flow pipe is successfully shortened, the appearance height of the equipment is successfully reduced under the condition that one equipment is selected under the condition that the asphalt falling film cooler needs large temperature difference when processing raw materials, and compared with the original scheme that two asphalt falling film coolers need to be connected in series, the design is simplified, and the occupied area, investment cost and operation cost of the equipment are saved;
2) adopt behind the scheme, pitch falling liquid film cooler can show the height that reduces equipment under the same condition of cooling difference in temperature, perhaps says so, under the same condition of equipment height, increases equipment diameter, also can reach the function that improves the difference in temperature of pitch cooling, like this, just can make the suitable multiple operating condition of pitch falling liquid film cooler for pitch falling liquid film cooler's use is handy.
Drawings
FIG. 1 is a schematic structural diagram of a double-tube-plate double-tube-layer asphalt falling film cooler according to the present invention;
FIG. 2 is a sectional view taken along the line A of FIG. 1 (sectional view taken along the 1 st dividing region), and the left half of the area of the plate is fixed with a downcomer;
FIG. 3 is a cross-sectional view taken along line B of FIG. 1 (section view taken through division 2) and having half the area on the right of the tube sheet to which a downcomer is attached;
fig. 4 is a schematic diagram of the structure of the cooling system of the present invention and a schematic diagram of the cooling process thereof.
In the figure: 1. the shell 2, a primary heat-exchange asphalt inlet pipe 3, a secondary heat-exchange asphalt inlet pipe 4, a primary heat-exchange asphalt outlet pipe 5, a secondary heat-exchange asphalt outlet pipe 6, a first high-pressure nitrogen inlet pipe 7, a second high-pressure nitrogen inlet pipe 8, a modified asphalt distribution pipe 9, a downcomer 10, a steam outlet pipe 11, a steam condensate inlet pipe 12, a 1 st pipe upper pipe plate 13, a 2 nd pipe upper pipe plate 14, a 1 st pipe lower pipe plate 15, a 2 nd pipe lower pipe plate 16, a steam condenser 17, a condensate water tank 18, a condensate water pump 19, a first flow regulating valve 20, a second flow regulating valve 21, a first nitrogen self-supporting regulating valve 22, a second nitrogen self-supporting regulating valve LRC01, a first liquid level recording regulating instrument LRC02 and a second
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings:
as shown in fig. 1-4, a double-tube-plate double-tube-layer asphalt falling film cooler comprises a shell 1, a 1 st tube-plate and a downcomer 9, wherein the 1 st tube-plate is divided into a 1 st tube-plate upper tube-plate 12 and a 1 st tube-plate lower tube-plate 14.
The utility model discloses newly increase 2 nd pipe layer tube sheet, 2 nd pipe layer tube sheet is by a pair of 2 nd pipe layer upper tube plate 13 and 2 nd pipe layer tube sheet 15 down constitute, and half quantity's downcomer 9 is fixed by a pair of original 1 st pipe layer tube sheet, and half quantity's downcomer 9 is fixed by a pair of newly-increased tube sheet, makes the downcomer of original pitch falling liquid film cooler, becomes double-barrelled pipe-layer pitch falling liquid film cooler of double-tube plate by single tube layer heat exchanger.
The top divides the liquid district to become two branch liquid districts by one, 1 minute divides the liquid district to be equipped with a first high pressure nitrogen gas inlet tube 6 and a heat transfer pitch inlet tube 2, 2 minute divides the liquid district to be equipped with a second high pressure nitrogen gas inlet tube 7 and secondary heat transfer pitch inlet tube 3, an pitch storage tank of lower part becomes two upper and lower pitch storage tanks, every pitch storage tank corresponds the branch liquid district at top separately, 1 minute divides the pitch storage tank above the liquid district corresponds, be equipped with heat transfer pitch outlet pipe 4 once, 2 minute divides the pitch storage tank below the liquid district corresponds, be equipped with secondary heat transfer pitch outlet pipe 5.
A plurality of asphalt distribution pipes are arranged on the primary heat exchange asphalt inlet pipe 2 and the secondary heat exchange asphalt inlet pipe 3. The upper portion of the shell between the upper tube plate 13 of the 2 nd tube layer and the lower tube plate 14 of the 1 st tube layer is provided with a water vapor outlet pipe 10, the lower portion of the shell is provided with a steam condensate inlet pipe 11, the pipeline connected with the primary heat exchange asphalt outlet pipe 4 is provided with a first flow regulating valve 19, the pipeline connected with the secondary heat exchange asphalt outlet pipe 5 is provided with a second flow regulating valve 20, the upper asphalt storage tank is provided with a first liquid level recording and regulating instrument LRC01, and the lower asphalt storage tank is provided with a second liquid level recording and regulating instrument LRC02.
A nitrogen self-supporting regulating valve I21 is arranged on a pipeline connected with the first high-pressure nitrogen inlet pipe 6; and a second nitrogen self-supporting regulating valve 22 is arranged on a pipeline connected with the second high-pressure nitrogen inlet pipe 7.
A cooling system comprises a double-tube-plate double-tube-layer asphalt falling film cooler, a steam condenser 16, a condensed water tank 17 and a condensed water pump 18. The top of the double-tube-plate double-tube-layer asphalt falling film cooler is provided with an upper liquid distribution area and a lower liquid distribution area, the upper liquid distribution area is a 1 st liquid distribution area, the lower liquid distribution area is a 2 nd liquid distribution area, each liquid distribution area is respectively provided with a nitrogen inlet pipe and an asphalt inlet pipe, and raw material asphalt enters from a primary heat exchange asphalt inlet pipe 2 of the 1 st liquid distribution area; a steam outlet pipe 10 is arranged at the upper part of the shell side of the downcomer liquid-liquid heat exchanger, a steam condensate inlet pipe 11 is arranged at the lower part of the downcomer liquid-liquid heat exchanger, the steam outlet pipe 10 is connected with the steam condensate inlet pipe 11 through an external circulating pipeline, and a steam condenser 16, a condensate water tank 17 and a condensate water pump 18 are sequentially arranged on the external circulating pipeline along the flowing direction of the medium in the pipe; every minute liquid district at top all has a corresponding pitch storage tank in the lower part, every pitch storage tank bottom all has a pitch outlet pipe, nitrogen gas that lets in through minute liquid district of top is regarded as the backpressure, makes pitch follow pitch outlet pipe extrusion, and every pitch outlet pipe way all establishes a flow control valve, all establishes liquid level record adjustment instrument on every pitch storage tank, and the flow of pitch is adjusted according to the liquid level record adjustment instrument automatically regulated pitch of the pitch storage tank that corresponds, and second pitch outlet pipe is the pitch outflow pipeline after the heat transfer.
The utility model discloses cooling system's working process, including following step:
1) liquid asphalt needing heat exchange enters from a primary heat exchange asphalt inlet pipe 2 of a 1 st liquid distribution area at the top of a double-pipe-plate double-pipe-layer asphalt falling film cooler 1, an upper pipe plate of the 1 st liquid distribution area is called as a 1 st pipe-plate upper pipe plate 12 and is equivalent to a liquid receiving disc, half area of the pipe plate is not provided with a fixed downcomer 9 according to the principle of equipment design, the liquid asphalt is uniformly distributed on the 1 st liquid distribution area upper pipe plate through a plurality of asphalt distribution pipes 8 arranged on an asphalt inlet connecting pipe and enters each downcomer 9 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 steam condensate of a shell side; the steam 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 1 through a condensate water pump 18 for heat exchange; and the nitrogen enters the 1 st liquid separation area through a high-pressure nitrogen inlet pipe 6 after being subjected to pressure regulation by a nitrogen self-standing regulating valve I21.
2) The asphalt storage tank is kept at a set liquid level, so that the pressure of the asphalt storage tank is kept not to influence the pressure of the liquid 2 nd area, the flow of the flowing asphalt is the same as the flow of the entering asphalt, the back pressure of nitrogen introduced through the liquid 1 st area is used as the power of the flowing out of the liquid asphalt, the nitrogen is pumped to the secondary heat exchange asphalt inlet pipe 3 of the liquid 2 nd area at the top of the asphalt falling film cooler, and the liquid level displayed by a liquid level recording control instrument LRC01 on the asphalt storage tank is kept constant through a flow control valve I19 arranged on the primary heat exchange asphalt outlet pipe.
3) 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 8 arranged on a secondary heat exchange asphalt inlet pipe 3 of the 2 nd liquid distribution area, and enters each downcomer in a full flow mode, uniform liquid films are formed in the downcomers to flow downwards, and the liquid asphalt is collected into the asphalt storage tank corresponding to the lowest part after reaching the required temperature through heat exchange of steam condensate with the same shell pass as the 1 st liquid distribution area, wherein an upper pipe plate of the 2 nd liquid distribution area is called as an upper pipe plate 13 of the 2 nd pipe layer, and the pipe plate has half area without a liquid descending port of the downcomer according to the principle of equipment design; and the nitrogen enters the 2 nd liquid separation area through a high-pressure nitrogen inlet pipe 7 after being subjected to pressure regulation by a nitrogen self-standing regulating valve I22.
4) 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 liquid asphalt is sent out of the double-tube-plate double-tube-layer asphalt falling film cooler 1, and the liquid level displayed by a liquid level recording control instrument LRC02 on the asphalt storage tank is kept constant through a flow regulating valve II 20 arranged on an asphalt outlet pipe; 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. The liquid asphalt comprises modified asphalt or moderate temperature asphalt.
The utility model discloses an on the basis of the original a pair of pipe sheet of going up of pitch falling liquid film cooler and pipe sheet down, newly increase a pair of pipe sheet and pipe sheet down, make original pitch falling liquid film cooler become double-barrelled layer heat exchanger by single-pipe-layer heat exchanger, be equivalent to two independent pitch falling liquid film coolers of sharing liquid-liquid heat exchanger, these two independent pitch falling liquid film coolers pass through respective nitrogen back pressure series operation, the height of downcomer has successfully been shortened, under the condition that the pitch falling liquid film cooler needs the cooling temperature difference to be big at the processing raw materials, the equipment appearance height has successfully been reduced under the condition of selecting for use an equipment, compare with the original scheme that needs two pitch falling liquid film coolers series operation, the design has been simplified, the equipment area of taking up an area of, investment cost and running cost have been saved;
adopt behind the scheme, pitch falling liquid film cooler can show the height that reduces equipment under the same condition of cooling difference in temperature, perhaps says so, under the same condition of equipment height, increases equipment diameter, also can reach the function that improves the difference in temperature of pitch cooling, like this, just can make the suitable multiple operating condition of pitch falling liquid film cooler for pitch falling liquid film cooler's use is handy.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (7)
1. The asphalt falling film cooler with double tube plates and double tube layers comprises a shell, a tube plate of a 1 st tube layer and a downcomer, wherein the tube plate of the 1 st tube layer is divided into an upper tube plate of the 1 st tube layer and a lower tube plate of the 1 st tube layer; a 1 st liquid separation area is arranged above the tube plate on the 1 st tube layer, and is provided with a first high-pressure nitrogen inlet tube and a primary heat exchange asphalt inlet tube, and a 2 nd liquid separation area is arranged above the tube plate on the 2 nd tube layer and is provided with a second high-pressure nitrogen inlet tube and a secondary heat exchange asphalt inlet tube; the downcomer is respectively fixed by the tube plate of the 1 st tube layer and the tube plate of the 2 nd tube layer.
2. The twin tube sheet twin tube layer pitch falling film cooler of claim 1 wherein the primary heat exchange pitch inlet tube and the secondary heat exchange pitch inlet tube are each provided with a plurality of pitch distribution tubes.
3. The double tube sheet double tube layer asphalt falling film cooler of claim 1, wherein a water vapor outlet tube is provided at an upper portion of the shell between the tube sheet on the 2 nd tube layer and the tube sheet on the 1 st tube layer, and a vapor condensate inlet tube is provided at a lower portion thereof.
4. The double-tube-plate double-tube-layer asphalt falling film cooler as claimed in claim 1, wherein the 1 st liquid separation area is provided with a primary heat exchange asphalt outlet pipe corresponding to an upper asphalt storage tank; the 2 nd liquid separating area is corresponding to the asphalt storage tank below and is provided with a secondary heat exchange asphalt outlet pipe.
5. The double-tube-plate double-tube-layer asphalt falling film cooler as claimed in claim 4, wherein a first flow control valve is arranged on a pipeline to which the primary heat exchange asphalt outlet pipe is connected, a second flow control valve is arranged on a pipeline to which the secondary heat exchange asphalt outlet pipe is connected, a first liquid level recording and adjusting instrument is arranged on an upper asphalt storage tank, and a second liquid level recording and adjusting instrument is arranged on a lower asphalt storage tank.
6. The double-tube-plate double-tube-layer asphalt falling film cooler according to claim 1, wherein a first nitrogen self-supporting regulating valve is arranged on a pipeline to which the first high-pressure nitrogen inlet tube is connected; and a nitrogen self-supporting regulating valve II is arranged on a pipeline connected with the second high-pressure nitrogen inlet pipe.
7. A cooling system based on the double-tube-plate double-tube-layer asphalt falling film cooler as claimed in any one of claims 1 to 6, which is characterized by comprising a double-tube-plate double-tube-layer asphalt falling film cooler, a steam condenser, a condensed water tank and a condensed water pump; a water vapor outlet pipe of the double-pipe-plate double-pipe-layer asphalt falling film cooler is connected with a steam condensate inlet pipe through an external circulating pipeline, and the external circulating pipeline is sequentially provided with a steam condenser, a condensate water tank and a condensate water pump along the flowing direction of a medium in the pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922176210.7U CN211601640U (en) | 2019-12-06 | 2019-12-06 | Double-tube-plate double-tube-layer asphalt falling film cooler and cooling system thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922176210.7U CN211601640U (en) | 2019-12-06 | 2019-12-06 | Double-tube-plate double-tube-layer asphalt falling film cooler and cooling system thereof |
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| CN211601640U true CN211601640U (en) | 2020-09-29 |
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| CN201922176210.7U Active CN211601640U (en) | 2019-12-06 | 2019-12-06 | Double-tube-plate double-tube-layer asphalt falling film cooler and cooling system thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110906760A (en) * | 2019-12-06 | 2020-03-24 | 中冶焦耐(大连)工程技术有限公司 | Double-tube-plate double-tube-layer asphalt falling film cooler and cooling system and process thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110906760A (en) * | 2019-12-06 | 2020-03-24 | 中冶焦耐(大连)工程技术有限公司 | Double-tube-plate double-tube-layer asphalt falling film cooler and cooling system and process thereof |
| CN110906760B (en) * | 2019-12-06 | 2024-01-16 | 中冶焦耐(大连)工程技术有限公司 | Double-tube-plate double-tube-layer asphalt falling film cooler and cooling system and process thereof |
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