CN115433602A - Dehydration tower series heating device for tar processing and use method thereof - Google Patents
Dehydration tower series heating device for tar processing and use method thereof Download PDFInfo
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- CN115433602A CN115433602A CN202211053745.5A CN202211053745A CN115433602A CN 115433602 A CN115433602 A CN 115433602A CN 202211053745 A CN202211053745 A CN 202211053745A CN 115433602 A CN115433602 A CN 115433602A
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- 230000018044 dehydration Effects 0.000 title claims abstract description 124
- 238000006297 dehydration reaction Methods 0.000 title claims abstract description 124
- 238000010438 heat treatment Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000010426 asphalt Substances 0.000 claims description 117
- 239000002994 raw material Substances 0.000 claims description 29
- 239000003034 coal gas Substances 0.000 claims description 17
- 238000000605 extraction Methods 0.000 claims description 10
- 239000000779 smoke Substances 0.000 claims description 8
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 4
- 239000003546 flue gas Substances 0.000 claims description 4
- 238000004821 distillation Methods 0.000 abstract description 7
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 239000011269 tar Substances 0.000 description 246
- 239000011280 coal tar Substances 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000007789 gas Substances 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 206010000369 Accident Diseases 0.000 description 1
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 230000005465 channeling Effects 0.000 description 1
- 238000001944 continuous distillation Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000011273 tar residue Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10C—WORKING-UP PITCH, ASPHALT, BITUMEN, TAR; PYROLIGNEOUS ACID
- C10C1/00—Working-up tar
- C10C1/04—Working-up tar by distillation
- C10C1/06—Removal of water
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01B—BOILING; BOILING APPARATUS ; EVAPORATION; EVAPORATION APPARATUS
- B01B1/00—Boiling; Boiling apparatus for physical or chemical purposes ; Evaporation in general
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/42—Regulation; Control
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Working-Up Tar And Pitch (AREA)
Abstract
The invention relates to the field of tar processing by using a heat treatment method except distillation, in particular to a heating device with dehydration towers connected in series for tar processing and a using method thereof. The utility model provides a dehydration tower series heating device for tar processing, includes main tower (1) and dehydration tower (2), characterized by: still include dehydration tower reboiler (3), first heat exchanger (41), second heat exchanger (42), first bottom oil pumpdown (51), second bottom oil pumpdown (52) and circulating pump (53), the bottom of main tower (1) is equipped with pitch export and tar entry, the side of dehydration tower (2) is equipped with the tar entry, the bottom of dehydration tower (2) is equipped with the tar export, dehydration tower reboiler (3), first heat exchanger (41) and second heat exchanger (42) all are equipped with pitch entry, pitch export, tar entry and tar export. The invention reduces energy consumption and investment.
Description
Technical Field
The invention relates to the field of tar processing by using a heat treatment method except distillation, in particular to a heating device with dehydration towers connected in series for tar processing and a using method thereof.
Background
The dehydration of the coal tar refers to the process of primarily removing the moisture contained in the coal tar, and is one of the preparation works of the distillation of the coal tar. The coal tar with ammonia water and tar residue separated out still contains about 4 percent of water. In the intermittent distillation process of the coal tar, the water can prolong the distillation time, reduce the processing capacity of equipment, increase the heat consumption and cause the coal tar to generate foam to cause oil channeling accidents. During the continuous distillation process of coal tar, water can increase the system pressure, destroy the normal process operation system, and cause the breakage of pipelines and equipment in serious cases to cause fire accidents. Meanwhile, the corrosive substances brought along with the moisture can corrode equipment and pipelines. Therefore, the coal tar must be dewatered before distillation.
The following methods are mainly used for final dehydration of coal tar:
a tubular furnace dehydration method: the technology is suitable for final dehydration of continuous tar distillation, and can dehydrate tar to below 0.5%. The principle is that the tar which is preliminarily dehydrated is placed in a convection section of a tubular furnace and is heated to 120-130 ℃, and then is subjected to flash evaporation dehydration in a primary evaporator.
Light oil azeotropic continuous dehydration method: the method adopts the international popular tar normal pressure dehydration technology, and the mutual heat exchange between the raw material and the product has the characteristics of energy saving and consumption reduction, and can dehydrate the tar to 0.1-0.2%. The principle is as follows: the crude tar and part of the high-temperature anhydrous tar after heat exchange and preheating are mixed and enter a dehydration tower, and light oil is used as reflux at the top of the tower. The water and light oil form an azeotropic mixture and are distilled out from the top of the tower, the azeotropic mixture is condensed and cooled to flow into a separator, and the light oil after water separation returns to the dehydration tower.
In both methods, the heat source of the dehydration tower needs to be provided by a heating furnace or high-quality steam (40 kg and above), and how to provide a stable heat source for the dehydration tower under the condition of no high-quality steam and no need of the heating furnace is a problem to be solved urgently in the final dehydration process of the tar at present.
Disclosure of Invention
The invention discloses a dehydration tower series heating device for tar processing and a using method thereof, aiming at overcoming the defects of the prior art and providing tar processing equipment with reduced energy consumption and investment.
The invention achieves the purpose by the following technical scheme:
a dehydration tower series heating device for tar processing comprises a main tower and a dehydration tower, and is characterized in that: also comprises a reboiler of the dehydration tower, a first heat exchanger, a second heat exchanger, a first bottom oil extraction pump, a second bottom oil extraction pump and a circulating pump,
the bottom of the main tower is provided with an asphalt outlet and a tar inlet,
a tar inlet is arranged on the side surface of the dehydration tower, a first tar outlet and a second tar outlet are arranged at the bottom of the dehydration tower,
the reboiler of the dehydration tower is provided with an asphalt inlet, an asphalt outlet, a tar inlet and a tar outlet,
the first heat exchanger is provided with an asphalt inlet, an asphalt outlet, a tar inlet and a tar outlet,
the second heat exchanger is provided with an asphalt inlet, an asphalt outlet, a tar inlet and a tar outlet;
the asphalt outlet of the main tower is connected with the asphalt inlet of the reboiler of the dehydrating tower through a pipeline which is connected with a first bottom oil extraction pump in series,
the first tar outlet of the dehydration tower is connected with the tar inlet of the reboiler of the dehydration tower through a pipeline which is connected with a circulating pump in series,
a second tar outlet of the dehydrating tower is connected with a tar inlet of the first heat exchanger through a pipeline which is connected with a second bottom oil extracting pump in series,
an asphalt outlet of the reboiler of the dehydration tower is connected with an asphalt inlet of the first heat exchanger through a pipeline, and a tar outlet of the reboiler of the dehydration tower is connected with a tar inlet of the dehydration tower through a pipeline;
an asphalt outlet of the first heat exchanger is connected with an asphalt inlet of the second heat exchanger through a pipeline, and a tar outlet of the first heat exchanger is connected with a tar inlet of the main tower through a pipeline;
the pitch outlet of the second heat exchanger is connected with a finished product pitch tank through a pipeline, the tar inlet of the second heat exchanger is connected with a raw material tar tank through a pipeline, and the tar outlet of the second heat exchanger is connected with the tar inlet of the dehydration tower through a pipeline.
The dehydration tower series heating device for tar processing is characterized in that: also comprises a tar tube furnace, wherein the tar tube furnace is arranged in the tar tube furnace,
the tar tubular furnace is provided with a tar inlet, a tar outlet, a coal gas inlet and a smoke outlet,
the tar outlet of the first heat exchanger is connected with the tar inlet of the tar tubular furnace through a pipeline, the tar outlet of the tar tubular furnace is connected with the tar inlet of the main tower through a pipeline, the coal gas inlet of the tar tubular furnace is connected with a coal gas source through a pipeline, and the flue gas outlet of the tar tubular furnace is connected with the external atmosphere through a pipeline.
The tar tubular furnace plays a supplementary role in emergency, once the system is abnormal in operation, the heating condition of tar is not ideal, and the tar tubular furnace can be started to maintain the operation of the system through the heating of the tar tubular furnace.
The use method of the dehydration tower series heating device for tar processing is characterized in that: the method is implemented in sequence according to the following steps:
(1) first heat exchange: the asphalt at the bottom of the main tower is pumped by a first bottom oil pump and is sequentially input into a dehydrating tower reboiler through an asphalt outlet of the main tower and an asphalt inlet of the dehydrating tower reboiler,
part of dehydration tar at the bottom of the dehydration tower is pumped by a circulating pump to be sequentially input into the dehydration tower reboiler through a first tar outlet of the dehydration tower and a tar inlet of the dehydration tower reboiler,
in a reboiler of the dehydration tower, the dehydrated tar input from the dehydration tower exchanges heat with the asphalt input from the main tower, the dehydrated tar is heated, and the asphalt is cooled;
(2) and (3) second heat exchange: the dehydration tar heated in the reboiler of the dehydration tower is sequentially input into the dehydration tower through the tar outlet of the reboiler of the dehydration tower and the tar inlet of the dehydration tower to be used as a heat source of the dehydration tower,
part of dehydrated tar at the bottom of the dehydrating tower is pumped by a second bottom oil pump and is sequentially input into the first heat exchanger through a second tar outlet of the dehydrating tower and a tar inlet of the first heat exchanger,
the cooled asphalt in the reboiler of the dehydrating tower is input into the first heat exchanger through an asphalt outlet of the reboiler of the dehydrating tower and an asphalt inlet of the first heat exchanger in sequence,
in the first heat exchanger, heat exchange is carried out between the dehydrated tar input from the reboiler of the dehydrating tower and the asphalt input from the reboiler of the dehydrating tower, the dehydrated tar is heated, and the asphalt is cooled;
(3) third heat exchange: the dehydrated tar heated in the first heat exchanger is sequentially input into the main tower through a tar outlet of the first heat exchanger and a tar inlet of the main tower, the raw material tar is input into the second heat exchanger through a tar inlet of the second heat exchanger from the raw material tar tank,
the cooled asphalt in the first heat exchanger is input into the second heat exchanger through an asphalt outlet of the first heat exchanger and an asphalt inlet of the second heat exchanger in sequence,
in the second heat exchanger, the raw material tar input from the raw material tar tank and the asphalt input from the first heat exchanger are subjected to heat exchange, the raw material tar is heated, the asphalt is cooled,
the raw material tar heated in the second heat exchanger is input into a tar inlet of the dehydration tower through a tar outlet of the second heat exchanger for dehydration, and the asphalt cooled in the second heat exchanger is input into a finished asphalt tank through an asphalt outlet of the second heat exchanger.
The use method of the dehydration tower series heating device for tar processing is characterized in that: the method is implemented in sequence according to the following steps:
(1) first heat exchange: asphalt at the bottom of the main tower is pumped by a first bottom oil pump and then is sequentially input into a dehydrating tower reboiler through an asphalt outlet of the main tower and an asphalt inlet of the dehydrating tower reboiler,
part of dehydration tar at the bottom of the dehydration tower is pumped by a circulating pump to be sequentially input into the dehydration tower reboiler through a first tar outlet of the dehydration tower and a tar inlet of the dehydration tower reboiler,
in a reboiler of the dehydration tower, the dehydrated tar input from the dehydration tower exchanges heat with the asphalt input from the main tower, the dehydrated tar is heated, and the asphalt is cooled;
(2) and (3) second heat exchange: the dehydrated tar heated in the reboiler of the dehydration tower is sequentially input into the dehydration tower as a heat source through the tar outlet of the reboiler of the dehydration tower and the tar inlet of the dehydration tower,
part of dehydrated tar at the bottom of the dehydrating tower is pumped by a second bottom oil pump and is sequentially input into the first heat exchanger through a second tar outlet of the dehydrating tower and a tar inlet of the first heat exchanger,
the asphalt cooled in the reboiler of the dehydration tower is input into the first heat exchanger through an asphalt outlet of the reboiler of the dehydration tower and an asphalt inlet of the first heat exchanger in sequence,
in the first heat exchanger, the heat exchange is carried out between the dehydrated tar input from the reboiler of the dehydrating tower and the asphalt input from the reboiler of the dehydrating tower, the dehydrated tar is heated, and the asphalt is cooled;
(3) third heat exchange: the dehydrated tar heated in the first heat exchanger is sequentially input into the tar tubular furnace through the tar outlet of the first heat exchanger and the tar inlet of the tar tubular furnace, the coal gas is input into the tar tubular furnace through the coal gas inlet of the tar tubular furnace, the coal gas is combusted in the tar tubular furnace to heat the dehydrated tar in the tar tubular furnace, the dehydrated tar heated in the tar tubular furnace is sequentially input into the main tower through the tar outlet of the tar tubular furnace and the tar inlet of the main tower, the smoke generated after the coal gas is combusted is discharged into the external atmosphere through the smoke outlet of the tar tubular furnace, the raw material tar is input into the second heat exchanger from the raw material tar tank through the tar inlet of the second heat exchanger,
the cooled asphalt in the first heat exchanger is input into the second heat exchanger through an asphalt outlet of the first heat exchanger and an asphalt inlet of the second heat exchanger in sequence,
in the second heat exchanger, the raw material tar input from the raw material tar tank and the asphalt input from the first heat exchanger are subjected to heat exchange, the raw material tar is heated, the asphalt is cooled,
the raw material tar heated in the second heat exchanger is input into a tar inlet of the dehydration tower for dehydration through a tar outlet of the second heat exchanger, and the cooled asphalt in the second heat exchanger is input into a finished asphalt tank through an asphalt outlet of the second heat exchanger.
The use method of the dehydration tower series heating device for tar processing is characterized in that:
in the step (2), dehydrated tar is heated to 200-240 ℃ in a first heat exchanger;
in the step (3), the asphalt is cooled to 150-200 ℃ in the second heat exchanger.
The invention has the following beneficial effects:
1. the heat of the soft asphalt at the bottom of the main tower is utilized, so that fuel gas is not required to be consumed additionally, and the energy consumption and the carbon emission are reduced;
2. the heat exchanger is used for providing heat for the dehydration tower, and a heating furnace is not required to be additionally arranged, so that the equipment investment is reduced.
Drawings
Figure 1 is a schematic view of the structure of the present invention,
FIG. 2 is a schematic diagram of the structure of the present invention with a tar tube furnace.
Detailed Description
The invention is further illustrated by the following specific examples.
Example 1
The utility model provides a dehydration tower series heating device for tar processing, includes main tower 1, dehydration tower 2, dehydration tower reboiler 3, first heat exchanger 41, second heat exchanger 42, first bottom oil pumper 51, second bottom oil pumper 52 and circulating pump 53, as shown in FIG. 1, concrete structure is:
the bottom of the main tower 1 is provided with an asphalt outlet and a tar inlet,
a tar inlet is arranged on the side surface of the dehydration tower 2, a first tar outlet and a second tar outlet are arranged at the bottom of the dehydration tower 2,
the reboiler 3 of the dehydration tower is provided with an asphalt inlet, an asphalt outlet, a tar inlet and a tar outlet,
the first heat exchanger 41 is provided with an asphalt inlet, an asphalt outlet, a tar inlet and a tar outlet,
the second heat exchanger 42 is provided with an asphalt inlet, an asphalt outlet, a tar inlet and a tar outlet;
the pitch outlet of the main tower 1 is connected to the pitch inlet of the dehydrating tower reboiler 3 through a pipeline connected in series with a first bottom oil extraction pump 51,
the first tar outlet of the dehydration tower 2 is connected with the tar inlet of the dehydration tower reboiler 3 through a pipeline which is connected with a circulating pump 53 in series,
the second tar outlet of the dehydration tower 2 is connected with the tar inlet of the first heat exchanger 41 through a pipeline which is connected with a second bottom oil extraction pump 52 in series,
an asphalt outlet of the dehydrating tower reboiler 3 is connected with an asphalt inlet of the first heat exchanger 41 through a pipeline, and a tar outlet of the dehydrating tower reboiler 3 is connected with a tar inlet of the dehydrating tower 2 through a pipeline;
an asphalt outlet of the first heat exchanger 41 is connected with an asphalt inlet of the second heat exchanger 42 through a pipeline, and a tar outlet of the first heat exchanger 41 is connected with a tar inlet of the main tower 1 through a pipeline;
the pitch outlet of the second heat exchanger 42 is connected with a finished product pitch tank 101 through a pipeline, the tar inlet of the second heat exchanger 42 is connected with a raw material tar tank 102 through a pipeline, and the tar outlet of the second heat exchanger 42 is connected with the tar inlet of the dehydration tower 2 through a pipeline.
When the method is used, the steps are implemented in sequence as follows:
(1) first heat exchange: asphalt at the bottom of the main tower 1 is pumped by a first bottom oil pump 51 and is sequentially input into the dehydrating tower reboiler 3 through an asphalt outlet of the main tower 1 and an asphalt inlet of the dehydrating tower reboiler 3,
part of dehydration tar at the bottom of the dehydration tower 2 is pumped by a circulating pump 53 and then is input into the dehydration tower reboiler 3 through a first tar outlet of the dehydration tower 2 and a tar inlet of the dehydration tower reboiler 3 in sequence,
in a dehydrating tower reboiler 3, heat exchange is performed between dehydrated tar input from a dehydrating tower 2 and pitch input from a main tower 1, the dehydrated tar is heated, and the pitch is cooled;
(2) and (3) second heat exchange: the dehydrated tar heated in the dehydrating tower reboiler 3 is sequentially input into the dehydrating tower 2 through the tar outlet of the dehydrating tower reboiler 3 and the tar inlet of the dehydrating tower 2 as the heat source of the dehydrating tower 2,
part of dehydrated tar at the bottom of the dehydrating tower 2 is pumped by a second bottom oil pump 52 and is sequentially input into the first heat exchanger 41 through a second tar outlet of the dehydrating tower 2 and a tar inlet of the first heat exchanger 41,
the pitch cooled in the dehydrating tower reboiler 3 is sequentially inputted to the first heat exchanger 41 through the pitch outlet of the dehydrating tower reboiler 3 and the pitch inlet of the first heat exchanger 41,
in the first heat exchanger 41, heat exchange is carried out between the dehydrated tar input from the dehydrating tower reboiler 3 and the pitch input from the dehydrating tower reboiler 3, the dehydrated tar is heated to 200 ℃ to 240 ℃, the pitch is cooled at 210 ℃ in the embodiment;
(3) third heat exchange: the dehydrated tar heated in the first heat exchanger 41 is sequentially input into the main tower 1 through the tar outlet of the first heat exchanger 41 and the tar inlet of the main tower 1, the raw material tar is input into the second heat exchanger 42 through the tar inlet of the second heat exchanger 42 from the raw material tar tank 102,
the pitch cooled in the first heat exchanger 41 is sequentially inputted to the second heat exchanger 42 through the pitch outlet of the first heat exchanger 41 and the pitch inlet of the second heat exchanger 42,
in the second heat exchanger 42, the raw tar fed from the raw tar tank 102 exchanges heat with the asphalt fed from the first heat exchanger 41, the raw tar is heated, the asphalt is cooled to 150-200 ℃, in this embodiment, 180 ℃,
the raw material tar heated in the second heat exchanger 42 is supplied to the tar inlet of the dehydration tower 2 through the tar outlet of the second heat exchanger 42 to be dehydrated, and the pitch cooled in the second heat exchanger 42 is supplied to the finished pitch tank 101 through the pitch outlet of the second heat exchanger 42.
Example 2
The utility model provides a dehydration tower series heating device for tar processing, includes main tower 1, dehydration tower 2, dehydration tower reboiler 3, first heat exchanger 41, second heat exchanger 42, first bottom oil pumper 51, second bottom oil pumper 52, circulating pump 53 and tar tubular furnace 6, as shown in FIG. 2, concrete structure is:
the bottom of the main tower 1 is provided with an asphalt outlet and a tar inlet,
a tar inlet is arranged on the side surface of the dehydration tower 2, a first tar outlet and a second tar outlet are arranged at the bottom of the dehydration tower 2,
the reboiler 3 of the dehydration tower is provided with an asphalt inlet, an asphalt outlet, a tar inlet and a tar outlet,
the first heat exchanger 41 is provided with an asphalt inlet, an asphalt outlet, a tar inlet and a tar outlet,
the second heat exchanger 42 is provided with an asphalt inlet, an asphalt outlet, a tar inlet and a tar outlet,
the tar tubular furnace 6 is provided with a tar inlet, a tar outlet, a coal gas inlet and a smoke outlet;
the pitch outlet of the main tower 1 is connected to the pitch inlet of the dehydrating tower reboiler 3 through a pipeline connected in series with a first bottom oil extraction pump 51,
the first tar outlet of the dehydration tower 2 is connected with the tar inlet of the dehydration tower reboiler 3 through a pipeline which is connected with a circulating pump 53 in series,
the second tar outlet of the dehydrating tower 2 is connected to the tar inlet of the first heat exchanger 41 through a pipeline connected in series with a second bottom oil extraction pump 52,
an asphalt outlet of the dehydrating tower reboiler 3 is connected with an asphalt inlet of the first heat exchanger 41 through a pipeline, and a tar outlet of the dehydrating tower reboiler 3 is connected with a tar inlet of the dehydrating tower 2 through a pipeline;
the tar outlet of the first heat exchanger 41 is connected with the tar inlet of the tar tubular furnace 6 through a pipeline, the tar outlet of the tar tubular furnace 4 is connected with the tar inlet of the main tower 1 through a pipeline, the coal gas inlet of the tar tubular furnace 4 is connected with the coal gas source 103 through a pipeline, and the smoke outlet of the tar tubular furnace 4 is connected with the outside atmosphere through a pipeline;
the pitch outlet of the second heat exchanger 42 is connected with a finished product pitch tank 101 through a pipeline, the tar inlet of the second heat exchanger 42 is connected with a raw material tar tank 102 through a pipeline, and the tar outlet of the second heat exchanger 42 is connected with the tar inlet of the dehydration tower 2 through a pipeline.
The tar tubular furnace 6 in this embodiment plays a supplementary role in emergency, and once the system operation is abnormal, that is, the heating condition of tar is not ideal, the tar tubular furnace 6 can be started, and the system operation can be maintained by heating the tar tubular furnace 6.
When the method is used, the steps are implemented in sequence as follows:
(1) first heat exchange: asphalt at the bottom of the main tower 1 is pumped by a first bottom oil pump 51 and is sequentially input into the dehydrating tower reboiler 3 through an asphalt outlet of the main tower 1 and an asphalt inlet of the dehydrating tower reboiler 3,
part of dehydrated tar at the bottom of the dehydrating tower 2 is pumped by a circulating pump 53 and then is input into the dehydrating tower reboiler 3 through a first tar outlet of the dehydrating tower 2 and a tar inlet of the dehydrating tower reboiler 3 in sequence,
in a dehydrating tower reboiler 3, heat exchange is performed between dehydrated tar input from a dehydrating tower 2 and pitch input from a main tower 1, the dehydrated tar is heated, and the pitch is cooled;
(2) and (3) second heat exchange: the dehydrated tar heated in the dehydrating tower reboiler 3 is sequentially input into the dehydrating tower 2 through the tar outlet of the dehydrating tower reboiler 3 and the tar inlet of the dehydrating tower 2 as the heat source of the dehydrating tower 2,
part of dehydrated tar at the bottom of the dehydrating tower 2 is pumped by a second bottom oil pump 52 and then is sequentially input into the first heat exchanger 41 through a second tar outlet of the dehydrating tower 2 and a tar inlet of the first heat exchanger 41,
the pitch cooled in the reboiler 3 of the dehydration column is sequentially fed into the first heat exchanger 41 through the pitch outlet of the reboiler 3 of the dehydration column and the pitch inlet of the first heat exchanger 41,
in the first heat exchanger 41, the heat exchange between the dehydrated tar input from the reboiler 3 of the dehydration tower and the pitch input from the reboiler 3 of the dehydration tower occurs, the dehydrated tar is heated to 200 ℃ to 240 ℃, the pitch is cooled at 210 ℃ in this embodiment;
(3) third heat exchange: the dehydrated tar heated in the first heat exchanger 41 is sequentially inputted into the tar tubular furnace 6 through the tar outlet of the first heat exchanger 41 and the tar inlet of the tar tubular furnace 6, the gas is inputted into the tar tubular furnace 6 through the gas inlet of the tar tubular furnace 6, the gas is burned in the tar tubular furnace 6 to heat the dehydrated tar in the tar tubular furnace 6, the dehydrated tar heated in the tar tubular furnace 6 is sequentially inputted into the main tower 1 through the tar outlet of the tar tubular furnace 6 and the tar inlet of the main tower 1, the flue gas generated after the gas is burned is discharged into the external atmosphere through the flue gas outlet of the tar tubular furnace 6, the raw material tar is inputted into the second heat exchanger 42 from the raw material tar tank 102 through the tar inlet of the second heat exchanger 42,
the pitch cooled in the first heat exchanger 41 is sequentially inputted to the second heat exchanger 42 through the pitch outlet of the first heat exchanger 41 and the pitch inlet of the second heat exchanger 42,
in the second heat exchanger 42, the raw tar fed from the raw tar tank 102 exchanges heat with the asphalt fed from the first heat exchanger 41, the raw tar is heated, the asphalt is cooled to 150 ℃ to 200 ℃, 180 ℃ is taken in this embodiment,
the raw material tar heated in the second heat exchanger 42 is supplied to the tar inlet of the dehydration tower 2 through the tar outlet of the second heat exchanger 42 to be dehydrated, and the pitch cooled in the second heat exchanger 42 is supplied to the finished pitch tank 101 through the pitch outlet of the second heat exchanger 42.
Claims (5)
1. The utility model provides a dehydration tower series heating device for tar processing, includes main tower (1) and dehydration tower (2), characterized by: also comprises a reboiler (3) of the dehydration tower, a first heat exchanger (41), a second heat exchanger (42), a first bottom oil extraction pump (51), a second bottom oil extraction pump (52) and a circulating pump (53),
the bottom of the main tower (1) is provided with an asphalt outlet and a tar inlet,
a tar inlet is arranged on the side surface of the dehydration tower (2), a first tar outlet and a second tar outlet are arranged at the bottom of the dehydration tower (2),
the reboiler (3) of the dehydration tower is provided with an asphalt inlet, an asphalt outlet, a tar inlet and a tar outlet,
the first heat exchanger (41) is provided with an asphalt inlet, an asphalt outlet, a tar inlet and a tar outlet,
the second heat exchanger (42) is provided with an asphalt inlet, an asphalt outlet, a tar inlet and a tar outlet;
the asphalt outlet of the main tower (1) is connected with the asphalt inlet of the reboiler (3) of the dehydration tower through a pipeline which is connected with a first bottom oil extraction pump (51) in series,
the first tar outlet of the dehydration tower (2) is connected with the tar inlet of the dehydration tower reboiler (3) through a pipeline which is connected with a circulating pump (53) in series,
a second tar outlet of the dehydrating tower (2) is connected with a tar inlet of the first heat exchanger (41) through a pipeline which is connected with a second bottom oil extracting pump (52) in series,
an asphalt outlet of the dehydrating tower reboiler (3) is connected with an asphalt inlet of the first heat exchanger (41) through a pipeline, and a tar outlet of the dehydrating tower reboiler (3) is connected with a tar inlet of the dehydrating tower (2) through a pipeline;
an asphalt outlet of the first heat exchanger (41) is connected with an asphalt inlet of the second heat exchanger (42) through a pipeline, and a tar outlet of the first heat exchanger (41) is connected with a tar inlet of the main tower (1) through a pipeline;
the pitch outlet of the second heat exchanger (42) is connected with a finished product pitch tank (101) through a pipeline, the tar inlet of the second heat exchanger (42) is connected with a raw material tar tank (102) through a pipeline, and the tar outlet of the second heat exchanger (42) is connected with the tar inlet of the dehydration tower (2) through a pipeline.
2. The series heating apparatus of the dewatering towers for tar processing according to claim 1, wherein: also comprises a tar tube furnace (6),
the tar tubular furnace (6) is provided with a tar inlet, a tar outlet, a coal gas inlet and a smoke outlet,
the tar outlet of the first heat exchanger (41) is connected with the tar inlet of the tar tubular furnace (6) through a pipeline, the tar outlet of the tar tubular furnace (4) is connected with the tar inlet of the main tower (1) through a pipeline, the coal gas inlet of the tar tubular furnace (4) is connected with the coal gas source (103) through a pipeline, and the flue gas outlet of the tar tubular furnace (4) is connected with the external atmosphere through a pipeline.
3. The method of using the dewatering tower series heating apparatus for tar processing as claimed in claim 1, wherein: the method is implemented in sequence according to the following steps:
(1) first heat exchange: asphalt at the bottom of the main tower (1) is pumped by a first bottom oil pump (51) and then is sequentially input into a dehydrating tower reboiler (3) through an asphalt outlet of the main tower (1) and an asphalt inlet of the dehydrating tower reboiler (3),
part of dehydrated tar at the bottom of the dehydrating tower (2) is pumped by a circulating pump (53) to be sequentially input into the dehydrating tower reboiler (3) through a first tar outlet of the dehydrating tower (2) and a tar inlet of the dehydrating tower reboiler (3),
in a dehydrating tower reboiler (3), the dehydrating tar input from the dehydrating tower (2) and the asphalt input from the main tower (1) exchange heat, the dehydrating tar is heated, and the asphalt is cooled;
(2) and (3) second heat exchange: the dehydrated tar heated in the dehydrating tower reboiler (3) is sequentially input into the dehydrating tower (2) through a tar outlet of the dehydrating tower reboiler (3) and a tar inlet of the dehydrating tower (2) to be used as a heat source of the dehydrating tower (2),
part of dehydrated tar at the bottom of the dehydrating tower (2) is pumped by a second bottom oil pump (52) and sequentially input into the first heat exchanger (41) through a second tar outlet of the dehydrating tower (2) and a tar inlet of the first heat exchanger (41),
the asphalt cooled in the reboiler (3) of the dehydration tower is sequentially input into the first heat exchanger (41) through an asphalt outlet of the reboiler (3) of the dehydration tower and an asphalt inlet of the first heat exchanger (41),
in the first heat exchanger (41), heat exchange is carried out between the dehydrated tar fed from the dehydrating tower reboiler (3) and the pitch fed from the dehydrating tower reboiler (3), the dehydrated tar is heated, and the pitch is cooled;
(3) third heat exchange: the dehydrated tar heated in the first heat exchanger (41) is sequentially input into the main tower (1) through a tar outlet of the first heat exchanger (41) and a tar inlet of the main tower (1), the raw material tar is input into the second heat exchanger (42) from the raw material tar groove (102) through the tar inlet of the second heat exchanger (42),
the asphalt cooled in the first heat exchanger (41) is input into the second heat exchanger (42) through an asphalt outlet of the first heat exchanger (41) and an asphalt inlet of the second heat exchanger (42) in sequence,
in the second heat exchanger (42), the raw tar fed from the raw tar tank (102) and the pitch fed from the first heat exchanger (41) exchange heat, the raw tar is heated, the pitch is cooled,
the raw material tar heated in the second heat exchanger (42) is input into a tar inlet of the dehydration tower (2) through a tar outlet of the second heat exchanger (42) for dehydration, and the pitch cooled in the second heat exchanger (42) is input into a finished pitch tank (101) through a pitch outlet of the second heat exchanger (42).
4. The method of using the dewatering tower series heating apparatus for tar processing as claimed in claim 2, wherein: the method is implemented in sequence according to the following steps:
(1) first heat exchange: asphalt at the bottom of the main tower (1) is pumped by a first bottom oil pump (51) and then is sequentially input into a dehydrating tower reboiler (3) through an asphalt outlet of the main tower (1) and an asphalt inlet of the dehydrating tower reboiler (3),
part of dehydration tar at the bottom of the dehydration tower (2) is pumped by a circulating pump (53) to be sequentially input into the dehydration tower reboiler (3) through a first tar outlet of the dehydration tower (2) and a tar inlet of the dehydration tower reboiler (3),
in a dehydrating tower reboiler (3), heat exchange is carried out between dehydrated tar input from a dehydrating tower (2) and asphalt input from a main tower (1), the dehydrated tar is heated, and the asphalt is cooled;
(2) and (3) second heat exchange: the dehydrated tar heated in the dehydrating tower reboiler (3) is sequentially input into the dehydrating tower (2) through a tar outlet of the dehydrating tower reboiler (3) and a tar inlet of the dehydrating tower (2) to be used as a heat source of the dehydrating tower (2),
part of dehydrated tar at the bottom of the dehydrating tower (2) is pumped by a second bottom oil pump (52) and is sequentially input into the first heat exchanger (41) through a second tar outlet of the dehydrating tower (2) and a tar inlet of the first heat exchanger (41),
the asphalt cooled in the reboiler (3) of the dehydration tower is sequentially input into the first heat exchanger (41) through an asphalt outlet of the reboiler (3) of the dehydration tower and an asphalt inlet of the first heat exchanger (41),
in the first heat exchanger (41), heat exchange is carried out between the dehydrated tar fed from the dehydrating tower reboiler (3) and the pitch fed from the dehydrating tower reboiler (3), the dehydrated tar is heated, and the pitch is cooled;
(3) third heat exchange: the dehydrated tar heated in the first heat exchanger (41) is sequentially input into the tar tubular furnace (6) through a tar outlet of the first heat exchanger (41) and a tar inlet of the tar tubular furnace (6), the coal gas is input into the tar tubular furnace (6) through a coal gas inlet of the tar tubular furnace (6), the coal gas is combusted in the tar tubular furnace (6) to heat the dehydrated tar in the tar tubular furnace (6), the dehydrated tar heated in the tar tubular furnace (6) is sequentially input into the main tower (1) through the tar outlet of the tar tubular furnace (6) and the tar inlet of the main tower (1), the smoke generated after the coal gas is combusted is discharged into the external atmosphere through the smoke outlet of the tar tubular furnace (6), the raw material tar is input into the second heat exchanger (42) from the raw material tar tank (102) through the tar inlet of the second heat exchanger (42),
the asphalt cooled in the first heat exchanger (41) is input into the second heat exchanger (42) through an asphalt outlet of the first heat exchanger (41) and an asphalt inlet of the second heat exchanger (42) in sequence,
in the second heat exchanger (42), the raw tar fed from the raw tar tank (102) and the pitch fed from the first heat exchanger (41) are heat-exchanged, the raw tar is heated, the pitch is cooled,
the raw material tar heated in the second heat exchanger (42) is input into a tar inlet of the dehydration tower (2) through a tar outlet of the second heat exchanger (42) for dehydration, and the pitch cooled in the second heat exchanger (42) is input into a finished pitch tank (101) through a pitch outlet of the second heat exchanger (42).
5. The use method of the dehydration tower series heating device for tar processing according to claim 3 or 4, wherein:
in the step (2), the dehydrated tar is heated to 200-240 ℃ in a first heat exchanger (41);
in the step (3), the asphalt is cooled to 150-200 ℃ in the second heat exchanger (42).
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