CN213492062U - Kettle internal heat siphon type rectifying tower - Google Patents
Kettle internal heat siphon type rectifying tower Download PDFInfo
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- CN213492062U CN213492062U CN202022152759.5U CN202022152759U CN213492062U CN 213492062 U CN213492062 U CN 213492062U CN 202022152759 U CN202022152759 U CN 202022152759U CN 213492062 U CN213492062 U CN 213492062U
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Abstract
The utility model relates to a rectifying column field discloses a cauldron internal heat hydrocone type rectifying column, include: the interior of the tower kettle is divided into a heating area and a non-heating area, wherein liquid in the non-heating area can freely flow from top to bottom in the tower kettle; the heat exchange tubes are respectively arranged in the heating zone along the axial direction of the tower kettle, two ends of each heat exchange tube are respectively fixed in the tower kettle through tube plates, and two ends of each heat exchange tube are respectively communicated with the non-heating zone; and the heating body heats the materials in the heat exchange tube in the heating zone, so that the liquid in the heat exchange tube flows upwards in the heat exchange tube after being heated, and the liquid flowing downwards in the non-heating zone forms circular flow in the tower kettle. The utility model discloses a form thermosiphon system in the tower cauldron, solve the defect that current built-in reboiler heat transfer efficiency is low and external reboiler installation arrangement space is big, not only heat transfer efficiency is high, can not occupy the outer space of tower moreover.
Description
Technical Field
The utility model relates to a rectifying column field indicates a cauldron internal heat hydrocone type rectifying column especially.
Background
At present, a reboiler is adopted in a rectifying tower as a heat exchanger for vaporizing a part of liquid phase materials returned to the tower as ascending gas phase materials, so that contact mass transfer between vapor and liquid phases in the tower can be carried out, and heat required by a distillation process is provided.
Typically 25% to 30% of the liquid phase is vaporized in the reboiler, the partially vaporized two-phase stream is fed back to the fractionation column, the vapor phase component returned to the column rises through trays, and the liquid phase component falls back to the bottom of the column.
The reboiler is in the form of vertical thermosyphon, vertical forced circulation, horizontal thermosyphon, horizontal forced circulation, kettle reboiler and built-in reboiler. Wherein, the built-in reboiler has poor heat transfer effect due to small heat transfer area, and is generally rarely used. The use of the reboilers of other forms has a common characteristic that the reboilers are arranged outside the rectifying tower, so that the vertical thermosyphon type reboilers have the defects of space saving and difficult land occupation and arrangement compared with the reboilers of other forms.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a thermal siphon formula rectifying column in cauldron realizes the thermosyphon circulation in the rectifying column tower cauldron, guarantees the high-efficient heat transfer in the tower cauldron, saves the installation arrangement space of rectifying column simultaneously.
The utility model provides a technical scheme as follows:
an in-kettle thermosyphon rectification column, comprising:
the interior of the tower kettle is divided into a heating area and a non-heating area, wherein liquid in the non-heating area can freely flow from top to bottom in the tower kettle;
the heat exchange tubes are respectively arranged in the heating area along the axial direction of the tower kettle, two ends of each heat exchange tube are respectively fixed in the tower kettle through tube plates, and two ends of each heat exchange tube are respectively communicated with the non-heating area;
and the heating body is used for heating the materials in the heat exchange tube in the heating area, so that the liquid in the heat exchange tube flows upwards in the heat exchange tube after being heated, and forms a circulating flow with the liquid flowing downwards in the non-heating area in the tower kettle.
In this scheme, through the zone of heating and the non-zone of heating that set up the isolation inside the tower cauldron, utilize the heating member to heat the liquid in the heat transfer pipe to make the liquid in the heat transfer pipe and the liquid in the non-zone of heating form the circulation flow, utilize the interior thermal siphon system of cauldron, reach the purpose that heat exchange efficiency is high and save occupation space.
Further, the heating zone is an annular space zone coaxial with the tower kettle, the inner wall of the tower kettle is an outer cylindrical surface of the annular space zone, and the inner side zone of the annular space zone is the non-heating zone.
In this scheme, set up the zone of heating to regional with the coaxial annular space of tower cauldron, utilize the regional setting of annular space, can conveniently heat the fluid in the heat-transfer pipe, this structure is compared with the outer thermosyphon reboiler of cauldron, owing to there is not outer communicating pipe of cauldron, so the resistance is little, and the circulation volume is big, and the velocity of flow is high in the heat-transfer pipe, and heat exchange efficiency is high.
Further, the tower comprises a through pipe and two annular pipe plates, wherein the through pipe is arranged in the tower kettle and is coaxially arranged with the tower kettle, the two annular pipe plates are respectively sleeved at two ends of the through pipe and are connected with the inner wall of the tower kettle, the annular gap area between the outer wall of the through pipe and the inner wall of the tower kettle is the heating area, the through pipe is internally provided with a non-heating area, the heat exchange pipe is arranged between the outer wall of the through pipe and the inner wall of the tower kettle, two ends of the heat exchange pipe are respectively communicated with the non-heating area through the annular pipe plates, materials in the heat exchange pipe are heated and then flow upwards in the heat exchange pipe, and liquid flowing downwards in the through pipe forms circular flow in the tower kettle.
In this scheme, set up the zone of heating of isolation through siphunculus and two annular tube sheets in the tower cauldron, the heat exchange tube setting is between the outer wall of siphunculus and the inner wall of tower cauldron, wears out annular tube sheet and the non-zone of heating intercommunication with the both ends of heat exchange tube to make liquid at siphunculus and the intraductal circulation flow of heat exchange.
Further, the inner diameter of the through pipe is 1/5-1/3 of the inner diameter of the tower kettle.
In this scheme, set up the internal diameter of siphunculus into 1/5 ~ 1/3 of tower cauldron internal diameter, like this, can guarantee that the district of heating of annulus region has sufficient heating area to make liquid form the circulation of multiplying by a big time in the tower cauldron, improve the circulating liquid measure of liquid in the tower cauldron.
Further, it is a plurality of the heat exchange tube parallel arrangement, and be a plurality of with regular triangle staggered arrangement between the heat exchange tube the outer wall of siphunculus with between the inner wall of tower cauldron, adjacent interval between the heat exchange tube is 0.3 ~ 0.6 times of heat exchange tube diameter.
In this scheme, with regular triangle staggered arrangement between a plurality of heat exchange tubes between the outer wall of siphunculus and the inner wall of tower cauldron to guarantee that the liquid in the heat exchange tube can obtain even being heated, thereby make liquid form stable circulation flow in the tower cauldron.
Furthermore, the heating body is high-temperature fluid flowing along the outer wall of the heat exchange tube, a high-temperature fluid inlet and a high-temperature fluid outlet are respectively formed in the side wall of the tower kettle close to the inner sides of the two annular tube plates, and the high-temperature fluid enters from the high-temperature fluid inlet and is discharged from the high-temperature fluid outlet.
In this scheme, adopt high temperature fluid to heat the liquid in the heat transfer pipe.
Further, a tower body is arranged at the top of the tower kettle, and the inner diameter of the through pipe is 1/4-2/3 of the inner diameter of the tower body.
In this scheme, set up the internal diameter of siphunculus into 1/4 ~ 2/3 of body of tower internal diameter to guarantee that liquid is wherein through speed is not more than 0.5m/s for the basis, the internal diameter undersize of siphunculus can lead to middle part liquid too few, forms not circulating flow, and the internal diameter of siphunculus is too big, can lead to the internal diameter of tower cauldron too big, and occupation space is also great.
Further, the tower tray device comprises a plurality of tower trays, wherein the tower trays are arranged in the tower body at intervals along the axial direction perpendicular to the tower body.
In the scheme, the liquid component is separated by the tray, the light component flows upwards, and the heavy component flows downwards.
Further, the bottom of the tower kettle is provided with a discharge port, and the discharge port is connected with a discharge pipe for discharging the separated high-boiling-point material.
In this scheme, the high boiling point material of tower cauldron is discharged through the discharge pipe.
Further, the tower still comprises a control valve and a liquid level controller, wherein the control valve is arranged on the discharge pipe, the liquid level controller is provided with a sensor for detecting the liquid level in the tower kettle, and the liquid level controller is electrically connected with the control valve and used for controlling the liquid level in the tower kettle.
In this scheme, control the liquid level in the tower cauldron through liquid level controller.
The technical effects of the utility model reside in that:
the utility model discloses a set up the zone of heating of isolation alone inside the tower cauldron to make liquid obtain the heating when the zone of heating, the boiling appears, forms two-phase fluid, and the liquid in the non-zone of heating forms the circulation flow, thereby at the inside heat formation siphon system of tower cauldron, when liquid flows in the heat transfer pipe, the heating member heats the liquid in the heat transfer pipe, thereby makes the liquid in the heat transfer pipe upwards flow in the tower cauldron, and the liquid of the downward flow in the non-zone of heating forms the circulation flow. Not only heat exchange efficiency is high, has solved the poor problem of current built-in reboiler heat exchange efficiency, through the heat transfer process in the cauldron, has solved the big defect of occupation space that exists of current external reboiler on the installation is arranged moreover.
Drawings
The invention will be described in further detail with reference to the following drawings and embodiments:
FIG. 1 is a schematic diagram of an embodiment of an in-kettle thermosyphon rectifier of the present invention;
fig. 2 is a schematic view of the arrangement structure of the heat exchange tube in the embodiment of the in-kettle siphon rectification column of the present invention.
The reference numbers illustrate:
1. the tower comprises a tower kettle, 11 heating zones, 12 non-heating zones, 13 high-temperature fluid inlets, 14 high-temperature fluid outlets, 15 discharge ports, 16 light component outlets, 2 heat exchange tubes, 3 through tubes, 4 annular tube plates, 5 tower bodies, 6 tower trays, 7 discharge tubes, 8 control valves and 9 liquid level controllers.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
As shown in figure 1, the utility model provides a kettle internal heat siphon type rectifying tower, which comprises a tower kettle 1 and a plurality of heat exchange tubes 2. The interior of the tower kettle 1 is divided into a heating area 11 and a non-heating area 12, so that the liquid in the tower kettle 1 forms a circulating flow in the tower kettle 1, namely, under the thermosiphon effect, a part of the liquid is partially vaporized after being heated in the heating area 11 to generate a two-phase fluid, and the two-phase fluid flows from bottom to top in the heating area 11 of the tower kettle 1. And a part of the liquid still flows from top to bottom in the non-heating zone 12 under the influence of gravity, and an internal thermal siphon system is formed in the tower kettle 1 because the density of the liquid in the non-heating zone 12 is greater than that of the two-phase fluid in the heating zone 11, so that the liquid in the tower kettle 1 circularly flows between the heating zone 11 and the non-heating zone 12.
The above-mentioned heating zone 11 and non-heating zone 12 are partial zone spaces in the column bottom 1, wherein the heating zone 11 needs to be isolated from the non-heating zone 12 by disposing corresponding isolating material in the column bottom 1 to isolate partial spaces in the column bottom 1, such as the tube plate and the through pipe used below. The specific shape formed after isolation is not limited herein, and may be an annular space shape used below, or may be other shapes such as a square shape or a semi-cylindrical shape, and the non-heating region 12 may be a region space left after partial isolation in the column bottom 1.
In the present embodiment, the heat exchange tubes 2 are disposed in the heating zone 11 to heat the material, and the plurality of heat exchange tubes 2 are respectively disposed in the heating zone 11 along the axial direction of the tower bottom 1, so that the material in the heat exchange tubes 2 flows upward in the heat exchange tubes 2 after being heated. Two ends of the heat exchange tube 2 are respectively fixed through tube plates. When the heat exchange tube 2 is actually arranged, the tube plate is fixed in the tower kettle 1, and two ends of the heat exchange tube 2 are fixed on the tube plate in a welding mode, so that the heat exchange tube 2 is fixed in the tower kettle 1.
Meanwhile, the material in the heat exchange tube 2 is heated in the heating zone 11 by a heating body, the liquid entering the heat exchange tube 2 is partially vaporized to form a two-phase fluid after being heated, and the two-phase fluid flows along the heat exchange tube 2 from bottom to top in the tower kettle 1 and enters the non-heating zone 12, so that the liquid flowing from top to bottom in the non-heating zone 12 forms a circulating flow.
The heating body can be a gas phase fluid with higher temperature, such as steam, or a liquid high-temperature fluid, such as heat transfer oil.
Because the separation part space in the tower kettle 1 is used for heating liquid, thereby forming a thermosyphon system in the tower kettle 1, compared with a rectifying tower with an external reboiler, the in-kettle thermosyphon rectifying tower in the embodiment better solves the problem of occupied space, and simultaneously compared with a rectifying tower with an internal reboiler, the separation of the independent heating space in the tower kettle 1 can ensure the heating effect on the liquid and the circulating flow effect between the liquid in the non-heating area 12 and the two-phase fluid in the heat exchange tube 2, thereby ensuring the heat exchange vaporization efficiency in the tower kettle 1.
In the present embodiment, in order to further optimize the above technical solution, the spatial shape and arrangement of the heating regions 11 are specifically described.
The heating zone 11 is an annular space zone coaxial with the tower bottom 1, the inner wall of the tower bottom 1 is an outer cylindrical surface of the annular space zone, and the inner side zone of the annular space zone is a zone space where the non-heating zone 12 is located.
By arranging the heating zone 11 as an annular space region, the liquid in the tower bottom 1 naturally flows from top to bottom along the inner side region of the annular space region, and after entering the heat exchange tube 2 in the annular space region, the liquid flows from bottom to top by heating, so that a circulating flow is formed between the annular space region and the inner side region of the annular space region. The annular space region not only is convenient for heating the liquid in the heat exchange tube 2, but also has small resistance to the flow of the fluid due to the absence of the communicating tube outside the kettle, large circulation volume, high flow rate of the liquid in the heat exchange tube 2 and high heat exchange efficiency.
The annular gap-shaped heating area 11 is arranged by adopting a through pipe 3 and two annular pipe plates 4, the through pipe 3 is coaxially arranged with the tower kettle 1, the two annular pipe plates 4 are respectively sleeved at two ends of the through pipe 3 and are connected with the inner wall of the tower kettle 1, the connection with the inner wall of the tower kettle 1 is referred to herein, namely the outer edge of the annular pipe plate 4 is connected with the inner wall of the tower kettle 1 in an abutting mode, so that an isolated heating area 11 is formed inside the tower kettle 1, and the inner edge of the annular pipe plate 4 is connected with the outer wall of the through pipe 3 in an abutting mode. Thus, a non-heating zone 12 is formed inside the through pipe 3, and an isolated heating zone 11 is formed in the annular space area between the outer wall of the through pipe 3, the two annular pipe plates 4 and the inner wall of the tower tank 1.
The heat exchange tube 2 is arranged between the outer wall of the through tube 3 and the inner wall of the tower kettle 1, and two ends of the heat exchange tube 2 are respectively communicated with the inner space of the tower kettle 1 through the annular tube plate 4, namely communicated with the non-heating area 12. Thus, the material in the heat exchange tube 2 will form a circular flow with the liquid in the through tube 3 after being heated.
The inner diameter of the through pipe 3 is set to be 1/5-1/3 of the inner diameter of the tower kettle 1, so that certain fluid flux in the through pipe 3 can be ensured, the fluid in the kettle can be heated circularly with high magnification, the circulating liquid amount of the liquid in the tower is larger than that (3 times) of a conventional vertical thermosiphon reboiler outside the tower, and the liquid can form circulation more than 5 times between the tower kettle 1 and the heat exchange pipe 2. Through the large-scale circulation of the kettle liquid, the liquid flow rate in the heat exchange tube 2 is improved, the adhesion probability of the medium in the heat exchange tube 2 is reduced, and the blocking risk is reduced.
As shown in fig. 2, in the present embodiment, in order to enable the plurality of heat exchange tubes 2 to be uniformly heated, the plurality of heat exchange tubes 2 are arranged in parallel, the plurality of heat exchange tubes 2 are staggered between the outer wall of the through tube 3 and the inner wall of the tower kettle 1 in a regular triangle, and the distance between adjacent heat exchange tubes 2 is 0.3 to 0.6 times the diameter of the heat exchange tubes 2, so that the high-temperature fluid flows between the heat exchange tubes 2 and simultaneously uniformly heats the material in each heat exchange tube 2.
In the present embodiment, in order to allow a high-temperature fluid (for example, steam) to flow in the annular space region, a high-temperature fluid inlet 13 and a high-temperature fluid outlet 14 are provided on the side wall of the column bottom 1 near the inner sides of the two annular tube plates 4, respectively, the high-temperature fluid inlet 13 being near the annular tube plate 4 located above, and the high-temperature fluid outlet 14 being near the annular tube plate 4 located below. After entering from the high-temperature fluid inlet 13, the high-temperature fluid heats the material in the heat exchange tube 2, and then is discharged from the high-temperature fluid outlet 14.
In this embodiment, the top of tower cauldron 1 is provided with body of the tower 5, and the internal diameter of siphunculus 3 is 1/4 ~ 2/3 of body of the tower 5 internal diameter to guarantee that liquid is not more than 0.5m/s in wherein through speed is for the basis, and the internal diameter undersize of siphunculus 3 can lead to middle part liquid too little, forms not form the circulation and flows, and the internal diameter of siphunculus 3 is too big, can lead to the internal diameter of tower cauldron 1 too big, and occupation space is also great.
The top of the tower body 5 is provided with a light component outlet 16, a plurality of trays 6 are arranged in the tower body 5, the trays 6 are arranged at intervals along the axial direction vertical to the tower body 5, and light components are discharged from the light component outlet 16 after being separated by the trays 6. Due to the existence of the through pipe 3, when heavy components fall into the kettle from the lowest tray 6, the heavy components partially fall into the through pipe 3 and partially fall into the heat exchange pipe 2. Part of liquid falling into the heat exchange tube 2 forms two-phase fluid after exchanging heat with gas phase mass transfer rising in the heat exchange tube 2, and the liquid falling into the through tube 3 naturally flows downwards in the tower kettle 1 due to low temperature and high density and enters the heat exchange tube 2 from the bottom of the tower kettle 1 to be heated and vaporized. Since there is always a density difference between the inner space of the duct 3 and the heat exchange tube 2, the liquid will form a stable circulation flow between the two areas.
The bottom of the tower kettle 1 is provided with a discharge port 15, the discharge port 15 is connected with a discharge pipe 7 for discharging the separated high boiling point materials, and the liquid level of the tower kettle is kept stable by discharging the separated high boiling point materials. Meanwhile, a liquid level control device is further arranged on the tower kettle 1, a control valve 8 is arranged on the discharge pipe 7, a liquid level controller 9 is arranged on the side wall of the tower kettle 1, a liquid level detection sensor of the liquid level controller 9 extends into the tower kettle 1, and the liquid level detection sensor is electrically connected with the control valve 8 so as to control the opening and closing of the control valve 8 through the liquid level controller 9 and control the liquid level in the tower kettle 1.
Above-mentioned internal heat siphon rectifying column of cauldron sets up the heating space with non-heating space isolation through the inside at tower cauldron 1 to make the heat transfer process of liquid go on in the cauldron, and can not occupy the outside space of tower cauldron 1, consequently, occupation space is less. Meanwhile, a good isolation effect is achieved between the heating area 11 and the non-heating area 12, so that a density difference always exists between the liquid in the through pipe 3 and the two-phase fluid in the heat exchange pipe 2, stable circulation flow of the liquid between the through pipe 3 and the heat exchange pipe 2 is ensured, the heat exchange efficiency in the kettle is ensured, and the problem of poor heat exchange efficiency of the existing built-in reboiler is well solved. Utilize the thermosiphon system that forms in the tower cauldron 1, through the isolation setting to the annular space shape of the zone of heating 11 and to the mode setting of heat exchange tube 2 regular triangle stagger, form the circulation of big multiple ratio in the tower to improve the liquid flow rate in the heat exchange tube 2, improved the heat exchange efficiency in the cauldron, reduced and blockked up the risk.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. An internal heat siphon rectifying tower in a kettle is characterized in that: the method comprises the following steps:
the interior of the tower kettle is divided into a heating area and a non-heating area, wherein liquid in the non-heating area can freely flow from top to bottom in the tower kettle;
the heat exchange tubes are respectively arranged in the heating area along the axial direction of the tower kettle, two ends of each heat exchange tube are respectively fixed in the tower kettle through tube plates, and two ends of each heat exchange tube are respectively communicated with the non-heating area;
and the heating body is used for heating the materials in the heat exchange tube in the heating area, so that the liquid in the heat exchange tube flows upwards in the heat exchange tube after being heated, and forms a circulating flow with the liquid flowing downwards in the non-heating area in the tower kettle.
2. The in-kettle thermosyphon rectification column of claim 1, wherein:
the heating zone is an annular space zone coaxial with the tower kettle, the inner wall of the tower kettle is an outer cylindrical surface of the annular space zone, and the inner side zone of the annular space zone is the non-heating zone.
3. The in-kettle thermosyphon rectification column of claim 2, wherein:
still include siphunculus and two annular tube sheets, the siphunculus sets up in the tower cauldron and with the coaxial setting of tower cauldron, two annular tube sheet suit respectively is in the both ends of siphunculus and with the interior wall connection of tower cauldron, the outer wall of siphunculus, two annular tube sheet with annular space between the tower cauldron inner wall does the zone of heating, the siphunculus is inside to be the zone of heating, the heat exchange tube sets up the outer wall of siphunculus with between the inner wall of tower cauldron, just the both ends of heat exchange tube pass through respectively annular tube sheet with the intercommunication of the zone of heating of non-heating, material in the heat exchange tube is after the heating upwards flows in the heat exchange tube, with the liquid that flows downwards in the siphunculus is in the formation circulation of tower cauldron flows.
4. The in-kettle thermosyphon rectification column of claim 3, wherein:
the inner diameter of the through pipe is 1/5-1/3 of the inner diameter of the tower kettle.
5. The in-kettle thermosyphon rectification column of claim 3, wherein:
it is a plurality of heat exchange tube parallel arrangement, and be a plurality of with regular triangle staggered arrangement between the heat exchange tube the outer wall of siphunculus with between the inner wall of tower cauldron, adjacent interval between the heat exchange tube does 0.3 ~ 0.6 times of heat exchange tube diameter.
6. The in-kettle thermosyphon rectification column of claim 3, wherein:
the heating body is high-temperature fluid flowing along the outer wall of the heat exchange tube, a high-temperature fluid inlet and a high-temperature fluid outlet are respectively formed in the side wall of the tower kettle and close to the inner sides of the two annular tube plates, and the high-temperature fluid enters from the high-temperature fluid inlet and is discharged from the high-temperature fluid outlet.
7. The in-kettle thermosyphon rectification column of claim 3, wherein:
the top of tower cauldron is provided with the body of the tower, the internal diameter of siphunculus is 1/4 ~ 2/3 of body of the tower internal diameter.
8. The internal thermal siphon rectification column in kettle according to claim 7, wherein:
the tower comprises a tower body, and is characterized by further comprising a plurality of trays, wherein the trays are arranged in the tower body at intervals along the axial direction perpendicular to the tower body.
9. The in-kettle thermosyphon rectification column of claim 1, wherein:
and the bottom of the tower kettle is provided with a discharge port, and the discharge port is connected with a discharge pipe for discharging the separated high-boiling-point material.
10. The in-kettle thermosyphon rectification column of claim 9, wherein:
the liquid level controller is provided with a sensor for detecting the liquid level in the tower kettle, and is electrically connected with the control valve and used for controlling the liquid level in the tower kettle.
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| CN202022152759.5U CN213492062U (en) | 2020-09-27 | 2020-09-27 | Kettle internal heat siphon type rectifying tower |
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| CN202022152759.5U CN213492062U (en) | 2020-09-27 | 2020-09-27 | Kettle internal heat siphon type rectifying tower |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113559541A (en) * | 2021-08-09 | 2021-10-29 | 中冶焦耐(大连)工程技术有限公司 | Process and system for recovering light components in heavy benzene by using waste heat of medium-temperature asphalt |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113559541A (en) * | 2021-08-09 | 2021-10-29 | 中冶焦耐(大连)工程技术有限公司 | Process and system for recovering light components in heavy benzene by using waste heat of medium-temperature asphalt |
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