CN115304446B - Flow setting of styrene device water intermodal transportation and digestion tower - Google Patents
Flow setting of styrene device water intermodal transportation and digestion tower Download PDFInfo
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- CN115304446B CN115304446B CN202211056058.9A CN202211056058A CN115304446B CN 115304446 B CN115304446 B CN 115304446B CN 202211056058 A CN202211056058 A CN 202211056058A CN 115304446 B CN115304446 B CN 115304446B
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- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 title claims abstract description 400
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 393
- 230000029087 digestion Effects 0.000 title claims abstract description 32
- YNQLUTRBYVCPMQ-UHFFFAOYSA-N Ethylbenzene Chemical compound CCC1=CC=CC=C1 YNQLUTRBYVCPMQ-UHFFFAOYSA-N 0.000 claims abstract description 138
- 239000002351 wastewater Substances 0.000 claims abstract description 80
- 238000000034 method Methods 0.000 claims abstract description 52
- 238000000926 separation method Methods 0.000 claims abstract description 28
- 238000011084 recovery Methods 0.000 claims abstract description 23
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 5
- 239000001301 oxygen Substances 0.000 claims abstract description 5
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 claims description 105
- OWZPCEFYPSAJFR-UHFFFAOYSA-N 2-(butan-2-yl)-4,6-dinitrophenol Chemical compound CCC(C)C1=CC([N+]([O-])=O)=CC([N+]([O-])=O)=C1O OWZPCEFYPSAJFR-UHFFFAOYSA-N 0.000 claims description 55
- 239000007788 liquid Substances 0.000 claims description 44
- 238000006356 dehydrogenation reaction Methods 0.000 claims description 43
- 238000004064 recycling Methods 0.000 claims description 25
- 230000001105 regulatory effect Effects 0.000 claims description 25
- 238000010992 reflux Methods 0.000 claims description 20
- 239000012071 phase Substances 0.000 claims description 17
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 15
- 238000004134 energy conservation Methods 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 12
- 239000000126 substance Substances 0.000 claims description 11
- 230000018044 dehydration Effects 0.000 claims description 8
- 238000006297 dehydration reaction Methods 0.000 claims description 8
- 230000007613 environmental effect Effects 0.000 claims description 8
- 239000008346 aqueous phase Substances 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 6
- 238000006116 polymerization reaction Methods 0.000 claims description 5
- 238000010411 cooking Methods 0.000 claims description 2
- 230000000979 retarding effect Effects 0.000 claims description 2
- 239000008400 supply water Substances 0.000 claims description 2
- 125000003011 styrenyl group Chemical group [H]\C(*)=C(/[H])C1=C([H])C([H])=C([H])C([H])=C1[H] 0.000 claims 6
- 238000011112 process operation Methods 0.000 abstract description 2
- 230000001502 supplementing effect Effects 0.000 description 9
- 239000010865 sewage Substances 0.000 description 7
- 239000002699 waste material Substances 0.000 description 6
- 239000013543 active substance Substances 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 231100000167 toxic agent Toxicity 0.000 description 4
- 239000003440 toxic substance Substances 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000009835 boiling Methods 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000010025 steaming Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C5/00—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms
- C07C5/32—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms by dehydrogenation with formation of free hydrogen
- C07C5/327—Formation of non-aromatic carbon-to-carbon double bonds only
-
- 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
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C7/00—Purification; Separation; Use of additives
- C07C7/04—Purification; Separation; Use of additives by distillation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Analytical Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
The application discloses a flow setting of a styrene device water intermodal transportation and a digestion tower, belonging to the technical field of styrene process operation, and characterized in that: the desalted water is sent to a deaerator through a pipeline I to remove dissolved oxygen and then is sent to a low-pressure boiler water feed pump, the low-pressure boiler water feed pump is sent to an ethylbenzene rectification unit and a styrene rectification unit through a new pipeline II, a new pipeline III and a new pipeline IV to be used for water intermodal transportation water supply, the ethylbenzene rectification unit and the styrene rectification unit are sent to a styrene settling tank through a new pipeline five, a new pipeline six and a new pipeline seven to be subjected to preliminary separation through the styrene settling tank and then are further subjected to steam stripping separation through a process condensate stripping tower, and the wastewater is sent to the deaerator after being treated through a process condensate filter by the original flow, so that the wastewater is used as the water intermodal transportation water supply of the ethylbenzene rectification unit and the styrene rectification unit, the technical problem that a large amount of wastewater is generated in the operation process of the traditional digestion tower is solved, and the wastewater recovery method is mainly applied to the operation aspect of a styrene device water intermodal transportation digestion tower.
Description
Technical Field
The application belongs to the technical field of styrene process operation, and particularly relates to a flow setting of a styrene device water intermodal transportation and digestion tower.
Background
At present, the operation of a water intermodal transportation and a digestion tower of a styrene device is mainly carried out in the following traditional mode:
(1) The water supplementing mode is as follows: the water is supplemented to the ethylbenzene rectification system and the styrene rectification system by connecting hoses on site, and the water supplementing points are mainly pouring and pouring from all places, so that the water supplementing points are scattered, and the operation is not facilitated.
(2) Water intermodal deoiling mode: the oil substances are removed by the water intermodal transportation through the top of each tower, the oil substances containing a large amount of water are sent to a dehydrogenation liquid tank/hydrocarbonate liquid tank for sedimentation and dehydration, and the removed water is also oily sewage and is discharged to a sewage system.
(3) The wastewater treatment mode generated by the intermodal transportation comprises the following steps: and wastewater generated by the water intermodal transportation is discharged to a sewage system through a tower top tower kettle.
(4) In the water supply process of the prior patent technology, the outlet of the stripping tower kettle pump supplies water to the ethylbenzene and styrene rectification unit through a temporary line.
(5) The material returning/water returning process of the prior patent technology is that a temporary pipeline is connected before an outlet of an ethylbenzene/styrene material returning heat exchanger is connected to a dehydrogenation reaction feeding regulating valve through a tee joint; and a temporary pipeline is connected from a feeding line of the dehydrogenation reactor to an aqueous phase chamber of the dehydrogenation liquid oil-water separation tank, and the temporary pipeline is used as a water-carrying material to return to the flow of the dehydrogenation liquid oil-water separation tank.
1 to 6 traditional operation modes of the water intermodal transportation and the cooking tower are synthesized, and the defects are as follows:
(1) The water supplementing points are scattered, the water supplementing quantity is uncontrollable, and the operation stability is poor.
(2) The wastewater is directly discharged to a sewage system without recycling, so that the wastewater treatment cost is increased, and meanwhile, the waste of water resources is caused, and about 2000 tons of water is needed for one-time water combined operation by taking a 60 ten thousand tons/year-scale styrene device as an example.
(3) The styrene rectification unit water intermodal wastewater contains the resident toxic substance DNBP, and is directly discharged to a sewage system without being recovered, so that the environmental pollution is increased.
(4) In the temporary storage dehydrogenation liquid tank/hydrocarbonate liquid tank for generating sewage, the capacity of the storage tank is limited, and in normal conditions, the thorough removal of oil substances in the system cannot be completed.
(5) In the water supply flow in the prior art, water is supplied to the ethylbenzene and styrene rectification units through the temporary line of the outlet of the stripping tower kettle, the water does not have the conditions of water supplementing to the boiler and external reverse supply, and the water utilization flexibility is low.
(6) The material/water returning flow in the prior art: connecting a temporary pipeline before an outlet of the ethylbenzene/styrene material returning heat exchanger is connected to a dehydrogenation reaction feeding regulating valve through a tee joint; the method is characterized in that a temporary pipeline is connected from a feeding line of a dehydrogenation reactor to an aqueous phase chamber of a dehydrogenation liquid-oil-water separation tank, the temporary pipeline is used as a water-carrying material to return to the flow of the dehydrogenation liquid-oil-water separation tank, a dehydrogenation reaction feeding line is occupied, the feeding line is polluted, meanwhile, a defective heat exchanger of a styrene rectifying unit and DNBP in the flow thereof are brought into the dehydrogenation liquid separator, DNBP is a huge toxic substance, the DNBP has high specific gravity and high boiling point and is difficult to remove in the oil-water separator and a stripping tower, pollution is formed to water quality, and the treated water quality is difficult to have the use condition of waste boiler water supplementing.
The defects existing in the traditional operation of the water intermodal transportation and the steaming tower are 1-6, in the actual production process, how to avoid the defects of the 1-6 are an important work task, and a new operation technology capable of solving the technical problems is needed to achieve the effects of energy conservation, environmental protection and high efficiency, so that I propose a flow setting of the water intermodal transportation and the steaming tower of the styrene device.
Disclosure of Invention
The application aims to provide a flow setting of a styrene device water intermodal transportation and a digestion tower, so as to solve the technical problems pointed out in the background, and in order to achieve the purposes, the application provides the following technical scheme:
the flow and operation method of the styrene device water intermodal transportation and digestion tower is characterized in that: when the water intermodal transportation of the styrene device starts working and testing for the first time, the desalted water is connected to a desalted water supply system from the outside, after the desalted water supply system deoxidizes the desalted water, the desalted water is supplied to the ethylbenzene rectification unit and the styrene rectification unit for intermodal transportation through a new pipeline, the ethylbenzene rectification unit and the styrene rectification unit supply water for intermodal transportation, the water intermodal transportation wastewater is supplied to a water intermodal transportation/digestion tower wastewater recovery treatment system through the new pipeline, and the qualified water intermodal transportation wastewater is supplied to the desalted water supply system for recycling after being treated by the water intermodal transportation/digestion tower wastewater recovery treatment system.
The desalted water supply system comprises a deaerator and a low-pressure boiler water supply pump, the ethylbenzene rectification unit comprises a benzene tower, a B/T tower, an ethylbenzene tower, a polyethylbenzene tower and a light component tower, the styrene rectification unit comprises a benzene/toluene tower, a low-pressure crude styrene tower, a high-pressure crude styrene tower and a refined styrene tower, and the water intermodal transportation/digestion tower wastewater recovery treatment system comprises a styrene settling tank, a process condensate stripping tower, a first water supply pump, a second water supply pump and an oil phase conveying pump.
Further: the desalted water which is connected from the outside of the boundary is sent to a deaerator through a pipeline I and then is sent to a low-pressure boiler feed pump, the low-pressure boiler feed pump is connected with a new pipeline II of a feed water main pipe, the new pipeline III and the new pipeline IV are connected with a self-contained feed water main pipe to be connected to an ethylbenzene rectification unit and a styrene rectification unit for water intermodal water supply, the ethylbenzene rectification unit and the styrene rectification unit collect water intermodal wastewater to a drainage main pipe seven through a new pipeline V and a new pipeline VI, the drainage main pipe seven sends the water intermodal wastewater to a styrene settling tank for wastewater oil-water separation, an oil phase is sent to a dehydrogenation liquid tank through an oil phase conveying pump, water phase is sent to a condensate stripping tower through a first feed water pump after preliminary separation by the styrene settling tank for further stripping and deoiling substances, qualified water is sent to the deaerator through a process condensate filter to realize the recycling of desalted water, a small amount of wastewater in each tower kettle of the styrene rectification unit (tar-containing treatment system) is sent to the dehydrogenation liquid tank for concentrated treatment, and the condensate generated by the reboiler is sent to the original process condensate recovery during the water intermodal transportation, and the condensate recovery is realized.
Further: the third newly added pipeline is a branch pipeline from the second newly added water intermodal water supply pipeline to the ethylbenzene rectification unit and the styrene rectification unit, the third newly added pipeline is used for water intermodal water supply of the ethylbenzene rectification unit, the third newly added pipeline is connected with two paths of water supply of the ethylbenzene rectification unit, one branch pipeline is connected with a defective ethylbenzene regulating valve of the benzene tower, and the water supply quantity to the benzene tower can be controlled by the regulating valve in the water intermodal process; the other path is a branch pipeline which is arranged near the reflux tank of the benzene tower and reaches the SO port of the reflux tank of the benzene tower for supplying water to the reflux tank of the benzene tower, the fourth newly added pipeline is a branch pipeline from the second newly added water intermodal feed water main pipe to the styrene rectification unit for supplying water to the styrene rectification unit, the fourth newly added pipeline is five paths from the fourth newly added pipeline to the styrene rectification unit, the first path is from the second newly added water main pipe to the inlet of the dehydrogenation liquid tank feeding and regulating valve, and the second path is from the branch pipeline to the inlet of the dehydrogenation liquid tank feeding and regulating valve: and a branch line is connected to the inlet of a feeding regulating valve of the low-pressure crude styrene tower through a newly added water supply header pipe II, and a third path is formed: and a branch line is connected to the inlet of the feeding regulating valve of the high-pressure crude styrene tower through a second newly added water supply main pipe, and the fourth path is as follows: and a branch line is connected to the SO port of the low-pressure condensing tower/collector through a second newly added water supply main pipe, and a fifth path is as follows: and a branch line is connected to the SO port of the high-pressure condensing tower/collector through a second newly added water supply main pipe.
Further: after preliminary separation, the styrene settling tank is subjected to further steam stripping separation through a condensate steam stripping tower, and then the styrene settling tank can be pumped to a deaerator through a second water supply pump, and water supply to the outside of the tank and water supply to the waste boiler through a low-pressure boiler water supply pump are realized, so that flexible utilization of water, energy conservation and consumption reduction are realized.
Further: the newly added pipeline six (6) is connected out through the outlet of each tower reflux pump of the styrene rectifying unit, so that the pollution to water quality caused by DNBP in the tower kettle of the styrene rectifying unit and in an unqualified system is avoided, DNBP is a toxic substance and is difficult to remove through steam stripping, DNBP is a heavy component substance in the water intermodal transportation operation process, a small amount of waste water containing DNBP is finally stored in the tower kettle system and is sent to a dehydrogenation liquid tank for collection through a pipeline nine, the waste water containing DNBP in the tower kettle in the water intermodal transportation process can be dehydrated by means of the styrene rectifying unit before the later startup, and the DNBP is recovered, so that the purposes of energy conservation and environmental protection are achieved.
Further: and (3) recycling a small amount of waste water containing DNBP by the water intermodal of the styrene rectifying unit, entering the styrene rectifying unit along with materials after the later start-up, wherein DNBP is a heavy component and is reserved in a crude/refined styrene tower kettle system, so that the heavy component is slowly polymerized to styrene, recycling is realized, and the small amount of water is sent to the dehydrogenation liquid tank along with the dehydration flow of the tops of the low-pressure crude styrene tower and the high-pressure crude styrene tower, so that the recycling of water is realized.
Compared with the prior art, the application has the following beneficial effects:
(1) Only a small number of newly added pipelines are added, so that the water intermodal wastewater can be treated and recycled, and the purposes of energy conservation and environmental protection are realized;
(2) Optimizing water supplement points of the water intermodal transportation by newly adding a water supplement flow, and facilitating the parallel stability operation of the water intermodal transportation;
(3) The traditional water intermodal wastewater contains DNBP which is an active substance and is directly discharged to a sewage system without being recovered, so that the environmental pollution is increased, and DNBP is stored in a tower kettle system;
(4) The technology of the application realizes the online treatment and recycling of the water intermodal wastewater, sustainably removes the oil matters of the rectifying system and improves the removal effect of the oil matters of the rectifying system;
(5) The water in the water intermodal transportation is treated again through the deaerator, so that the water quality is further ensured, the water using condition of the waste heat boiler is provided, when the water in the water intermodal transportation is rich, the waste heat boiler can be supplied through the water supply pump part of the low-pressure boiler, meanwhile, the surplus water can be supplied to the outside of the boundary for use through the existing flow of the water supply pump outlet of the low-pressure boiler, the operation is flexible, and the water utilization rate is high;
(6) The drainage flow does not occupy a dehydrogenation reaction feeding line, the feeding line has no pollution risk, and adverse effects of water intermodal transportation on a reactor catalyst are avoided;
(7) The application avoids the disqualified heat exchanger of the styrene rectification unit and DNBP in the flow thereof being brought into the dehydrogenation liquid separator, the DNBP is a huge toxic substance, has high specific gravity and boiling point, is difficult to remove in an oil-water separator and a stripping tower, and causes pollution to water quality.
Drawings
FIG. 1 is a general flow chart of the present application;
FIG. 2 is a flow chart of the drainage of the present application;
FIG. 3 shows the water replenishing process of the present application.
Detailed Description
The technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments, and all other embodiments obtained by persons skilled in the art without making any inventive effort based on the embodiments of the present application are within the scope of protection of the present application.
In the description of the application patent, it should be noted that, directions or positional relationships indicated by terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", etc., are based on directions or positional relationships shown in the drawings, are merely for convenience of describing the application patent and simplifying the description, and are not to be construed as limitations on the application patent, indicating or implying that the apparatus or element being referred to must have a specific direction, be constructed and operated in a specific direction, and furthermore, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Example 1:
as shown in fig. 1-3: the flow and operation method of the styrene device water intermodal transportation and digestion tower is characterized in that: when the water intermodal transportation of the styrene device starts working and testing for the first time, the water intermodal transportation is connected with desalted water from the outside and is sent to a desalted water supply system, after the desalted water is deoxidized by the desalted water supply system, the desalted water is sent to an ethylbenzene rectification unit and a styrene rectification unit through a new pipeline for water intermodal transportation and is used, the ethylbenzene rectification unit and the styrene rectification unit send water intermodal transportation wastewater to a water intermodal transportation/digestion tower wastewater recovery treatment system through the new pipeline, and the water intermodal transportation wastewater is sent to the desalted water supply system for recycling after being qualified by the water intermodal transportation/digestion tower wastewater recovery treatment system;
the desalted water supply system comprises a deaerator and a low-pressure boiler feed pump, the ethylbenzene rectification unit comprises a benzene tower, a B/T tower, an ethylbenzene tower, a polyethylbenzene tower and a light component tower, the styrene rectification unit comprises a benzene/toluene tower, a low-pressure crude styrene tower, a high-pressure crude styrene tower and a refined styrene tower, and the water intermodal transportation/digestion tower waste water recovery treatment system comprises a styrene settling tank, a first feed pump of a process condensate stripping tower, a second feed pump and an oil phase conveying pump;
the desalted water which is connected from the outside of the boundary is sent to a deaerator through a pipeline I to remove dissolved oxygen and then is sent to a low-pressure boiler feed pump, the low-pressure boiler feed pump is connected with a new pipeline II of a feed water main pipe, the new pipeline III and the new pipeline IV are connected with a pipeline III and a pipeline IV to be connected to an ethylbenzene rectification unit and a styrene rectification unit for water intermodal water supply, the ethylbenzene rectification unit and the styrene rectification unit sink water intermodal wastewater to a drainage main pipe seven 7 through a new pipeline V5 and a new pipeline V6, the drainage main pipe seven 7 sends the water intermodal wastewater to a styrene settling tank for wastewater oil-water separation, an oil phase is sent to a dehydrogenation liquid tank through an oil phase conveying pump, an aqueous phase is sent to a condensate stripping tower through a first water supply pump after preliminary separation of the styrene settling tank for further stripping and removing oil matters, the qualified water is sent to the deaerator through a process condensate filter to realize the recycling of desalted water, a small amount of wastewater contained in each tower of the styrene rectification unit (tar-containing treatment system) is sent to a dehydrogenation liquid tank for concentrated treatment, and the condensate generated by the rectification tank is sent to the original process condensate recovery flow during the water intermodal water transport;
the new added pipeline II 2 is a new added water intermodal water supply pipeline main pipe, a tee branch is connected to an outlet main pipe of a water supply pump of the low-pressure boiler to connect a new added pipeline III 3 and a new added pipeline IV 4, the new added pipeline III 3 and the new added pipeline IV are distributed to an ethylbenzene rectification unit and a styrene rectification unit along a pipeline corridor in the device, the new added pipeline III 3 is a branch pipeline from the new added water intermodal water supply main pipe II 2 to the ethylbenzene rectification unit and is used for water intermodal water supply of the ethylbenzene rectification unit, the new added pipeline III is connected to the ethylbenzene rectification unit for water supply of two pipelines, one branch pipeline is connected to a position of a benzene tower disqualified ethylbenzene regulating valve, and the water supply quantity to the benzene tower can be controlled through the regulating valve in the water intermodal process; the other path is a branch line which is arranged near the benzene tower reflux tank and reaches the SO port of the benzene tower reflux tank and is used for supplying water to the benzene tower reflux tank, the fourth added line 4 is a branch line from the second added water intermodal feed water header pipe to the styrene rectification unit and is used for supplying water to the styrene rectification unit, the fourth added line 4 is five paths of water supply from the styrene rectification unit, the first path is that the second added water header pipe 2 is connected with the branch line to the inlet of the dehydrogenation liquid tank feed valve, and the second path is that: and a branch pipeline is connected to the inlet of a feeding regulating valve of the low-pressure crude styrene tower through a newly added water supply header pipe II 2, and a third path is formed: and a branch line is connected to the inlet of the feeding regulating valve of the high-pressure crude styrene tower through a second newly added water supply header pipe 2, and the fourth path is as follows: and a branch line is connected to the SO port of the low-pressure condensing tower/collector through a second newly added water supply header pipe 2, and a fifth path is as follows: the branch line is connected to the SO port of the high-pressure condensing tower/collector through a second newly added water supply header pipe 2; after preliminary separation, the styrene settling tank is subjected to further steam stripping separation through a condensate steam stripping tower, and then the condensate is qualified, the condensate is pumped to a deaerator through a second water supply pump, and water supply to the outside of the tank and water supply to a waste boiler through a low-pressure boiler water supply pump are realized, so that flexible utilization of water, energy conservation and consumption reduction are realized;
the newly added pipeline six 6 is connected out through the outlet of each tower reflux pump of the styrene rectification unit, so that the pollution of DNBP in the tower kettle of the styrene rectification unit and in an unqualified system to water quality is avoided, DNBP is an active substance and is difficult to remove by steam stripping, DNBP is a heavy component substance in the water intermodal operation process, the DNBP is deposited in the tower kettle system, a small amount of waste water containing DNBP is finally sent to a dehydrogenation liquid tank for collection through a pipeline nine 9, the waste water containing DNBP in the tower kettle in the water intermodal operation process can be dehydrated by means of the styrene rectification unit before the later startup, and the DNBP is recovered, so that the purposes of energy conservation and environmental protection are achieved;
and (3) recycling a small amount of waste water containing DNBP by the water intermodal of the styrene rectifying unit, enabling the waste water to enter the styrene rectifying unit along with materials after the later start-up, wherein DNBP is a heavy component, and is reserved in a crude/refined styrene tower kettle system to perform a slow polymerization function on styrene so as to realize reutilization, and conveying the small amount of water to the dehydrogenation liquid tank along with a dehydration process of the tops of a low-pressure crude styrene tower and a high-pressure crude styrene tower so as to realize recycling of water.
The working principle of the application is as follows: the device is started up originally, water intermodal transportation is carried out before the device is used for oil feeding, and a system is cleaned and debugged, and the steps are as follows:
(1) The desalted water from outside the boundary is supplemented with water to the deaerator through a first pipeline 1, and a normal liquid level is established.
(2) And the water supplementing of the ethylbenzene rectification unit and the styrene rectification unit is realized through the newly added pipeline II 2, the newly added pipeline III 3 and the newly added pipeline IV 4, and the water intermodal transportation is established according to the water intermodal transportation operation steps.
(3) After steam is applied to reboilers of the ethylbenzene rectification unit and the styrene rectification unit, the reboilers are flushed cleanly, steam condensate is merged into a process condensate stripping tower and a deaerator through an original flow 8, and finally, the steam condensate is merged into a water intermodal system through a newly added pipeline II, a newly added pipeline III and a newly added pipeline IV 4, so that the condensate is recycled.
(4) The ethylbenzene rectification unit and the styrene rectification unit are used for carrying out water intermodal transportation on wastewater, according to the actual requirements on site, after being partially treated by a wastewater recovery treatment system, water circulation is established through a deaerator, a newly added pipeline II 2, a newly added pipeline III 3 and a newly added pipeline IV 4, the continuous operation of the system is maintained, the water quality is recycled, and the rest part is supplemented by the extra-boundary desalted water.
(5) Before the first start-up, desalted water is added from the outside to carry out water intermodal transportation start-up test run so as to wash each pipeline.
Example 2:
as shown in fig. 1-3: the flow and operation method of the styrene device water intermodal transportation and digestion tower is characterized in that: when the water intermodal transportation of the styrene device starts working and testing for the first time, the water intermodal transportation is connected with desalted water from the outside and is sent to a desalted water supply system, after the desalted water is deoxidized by the desalted water supply system, the desalted water is sent to an ethylbenzene rectification unit and a styrene rectification unit through a new pipeline for water intermodal transportation and is used, the ethylbenzene rectification unit and the styrene rectification unit send water intermodal transportation wastewater to a water intermodal transportation/digestion tower wastewater recovery treatment system through the new pipeline, and the water intermodal transportation wastewater is sent to the desalted water supply system for recycling after being qualified by the water intermodal transportation/digestion tower wastewater recovery treatment system;
the desalted water supply system comprises a deaerator and a low-pressure boiler feed pump, the ethylbenzene rectification unit comprises a benzene tower, a B/T tower, an ethylbenzene tower, a polyethylbenzene tower and a light component tower, the styrene rectification unit comprises a benzene/toluene tower, a low-pressure crude styrene tower, a high-pressure crude styrene tower and a refined styrene tower, and the water intermodal transportation/digestion tower waste water recovery treatment system comprises a styrene settling tank, a first feed pump of a process condensate stripping tower, a second feed pump and an oil phase conveying pump;
the desalted water which is connected from the outside of the boundary is sent to a deaerator through a pipeline I to remove dissolved oxygen and then is sent to a low-pressure boiler feed pump, the low-pressure boiler feed pump is connected with a new pipeline II of a feed water main pipe, the new pipeline III and the new pipeline IV are connected with a pipeline III and a pipeline IV to be connected to an ethylbenzene rectification unit and a styrene rectification unit for water intermodal water supply, the ethylbenzene rectification unit and the styrene rectification unit sink water intermodal wastewater to a drainage main pipe seven 7 through a new pipeline V5 and a new pipeline V6, the drainage main pipe seven 7 sends the water intermodal wastewater to a styrene settling tank for wastewater oil-water separation, an oil phase is sent to a dehydrogenation liquid tank through an oil phase conveying pump, an aqueous phase is sent to a condensate stripping tower through a first water supply pump after preliminary separation of the styrene settling tank for further stripping and removing oil matters, the qualified water is sent to the deaerator through a process condensate filter to realize the recycling of desalted water, a small amount of wastewater contained in each tower of the styrene rectification unit (tar-containing treatment system) is sent to a dehydrogenation liquid tank for concentrated treatment, and the condensate generated by the rectification tank is sent to the original process condensate recovery flow during the water intermodal water transport;
the new added pipeline II 2 is a new added water intermodal water supply pipeline main pipe, a tee branch is connected to an outlet main pipe of a water supply pump of the low-pressure boiler to connect a new added pipeline III 3 and a new added pipeline IV 4, the new added pipeline III 3 and the new added pipeline IV are distributed to an ethylbenzene rectification unit and a styrene rectification unit along a pipeline corridor in the device, the new added pipeline III 3 is a branch pipeline from the new added water intermodal water supply main pipe II 2 to the ethylbenzene rectification unit and is used for water intermodal water supply of the ethylbenzene rectification unit, the new added pipeline III is connected to the ethylbenzene rectification unit for water supply of two pipelines, one branch pipeline is connected to a position of a benzene tower disqualified ethylbenzene regulating valve, and the water supply quantity to the benzene tower can be controlled through the regulating valve in the water intermodal process; the other path is a branch line which is arranged near the benzene tower reflux tank and reaches the SO port of the benzene tower reflux tank and is used for supplying water to the benzene tower reflux tank, the fourth added line 4 is a branch line from the second added water intermodal feed water header pipe to the styrene rectification unit and is used for supplying water to the styrene rectification unit, the fourth added line 4 is five paths of water supply from the styrene rectification unit, the first path is that the second added water header pipe 2 is connected with the branch line to the inlet of the dehydrogenation liquid tank feed valve, and the second path is that: and a branch pipeline is connected to the inlet of a feeding regulating valve of the low-pressure crude styrene tower through a newly added water supply header pipe II 2, and a third path is formed: and a branch line is connected to the inlet of the feeding regulating valve of the high-pressure crude styrene tower through a second newly added water supply header pipe 2, and the fourth path is as follows: and a branch line is connected to the SO port of the low-pressure condensing tower/collector through a second newly added water supply header pipe 2, and a fifth path is as follows: the branch line is connected to the SO port of the high-pressure condensing tower/collector through a second newly added water supply header pipe 2; after preliminary separation, the styrene settling tank is subjected to further steam stripping separation through a condensate steam stripping tower, and then the condensate is qualified, the condensate is pumped to a deaerator through a second water supply pump, and water supply to the outside of the tank and water supply to a waste boiler through a low-pressure boiler water supply pump are realized, so that flexible utilization of water, energy conservation and consumption reduction are realized;
the newly added pipeline six 6 is connected out through the outlet of each tower reflux pump of the styrene rectification unit, so that the pollution of DNBP in the tower kettle of the styrene rectification unit and in an unqualified system to water quality is avoided, DNBP is an active substance and is difficult to remove by steam stripping, DNBP is a heavy component substance in the water intermodal operation process, the DNBP is deposited in the tower kettle system, a small amount of waste water containing DNBP is finally sent to a dehydrogenation liquid tank for collection through a pipeline nine 9, the waste water containing DNBP in the tower kettle in the water intermodal operation process can be dehydrated by means of the styrene rectification unit before the later startup, and the DNBP is recovered, so that the purposes of energy conservation and environmental protection are achieved;
and (3) recycling a small amount of waste water containing DNBP by the water intermodal of the styrene rectifying unit, enabling the waste water to enter the styrene rectifying unit along with materials after the later start-up, wherein DNBP is a heavy component, and is reserved in a crude/refined styrene tower kettle system to perform a slow polymerization function on styrene so as to realize reutilization, and conveying the small amount of water to the dehydrogenation liquid tank along with a dehydration process of the tops of a low-pressure crude styrene tower and a high-pressure crude styrene tower so as to realize recycling of water.
The working principle of the application is as follows: after the device operates normally, water intermodal transportation is carried out, the ethylbenzene rectification unit and the styrene rectification unit are cleaned, oil matters in the rectification unit are removed, and the steps are summarized as follows:
(1) The desalted water from outside the boundary is supplemented with water to the deaerator through a first pipeline 1, and a normal liquid level is established.
(2) And water supplementing of the ethylbenzene rectification unit and the styrene rectification unit is realized through the newly added pipeline II 2, the newly added pipeline III 3 and the newly added pipeline IV 4, so that water intermodal transportation is established.
(3) After steam is applied to reboilers of the ethylbenzene rectification unit and the styrene rectification unit, the reboilers are flushed completely, steam condensate is merged into a process condensate stripping tower and a deaerator through an original flow 8, and finally the steam condensate is merged into a water intermodal system through a new added pipeline II 2, a new added pipeline III 3 and a new added pipeline IV 4 for recycling.
(4) The water intermodal wastewater of the ethylbenzene rectification unit and the styrene rectification unit is sent to a styrene settling tank and a process condensate stripping tower through a new pipeline five 5, a new pipeline six 6 and a new pipeline seven 7 to be treated so as to realize oil matter recovery, water qualified in treatment is built into water intermodal circulation through a deaerator, a new pipeline two 2, a new pipeline three 3 and a new pipeline four 4, the continuous operation of the system is kept, and the other parts are supplemented by extra-boundary desalted water; oil substances in the wastewater are collected by a styrene settling tank oil chamber and finally are pumped to a dehydrogenation liquid tank for collection by a first water supply pump.
(5) The DNBP in the styrene rectifying unit and the system is accumulated in the tower kettle, and then is sent to a dehydrogenation liquid tank along with a small amount of waste water through the original unqualified flow, and the DNBP can be dehydrated by the styrene rectifying unit before the later start-up, so that the purposes of energy conservation and environmental protection are achieved.
(6) Through the flow, the water is recycled, and the system is continuously transported/steamed until the oil substances in the system are removed to be qualified.
Example 3:
as shown in fig. 1-3: as shown in fig. 1-3: the flow and operation method of the styrene device water intermodal transportation and digestion tower is characterized in that: when the water intermodal transportation of the styrene device starts working and testing for the first time, the water intermodal transportation is connected with desalted water from the outside and is sent to a desalted water supply system, after the desalted water is deoxidized by the desalted water supply system, the desalted water is sent to an ethylbenzene rectification unit and a styrene rectification unit through a new pipeline for water intermodal transportation and is used, the ethylbenzene rectification unit and the styrene rectification unit send water intermodal transportation wastewater to a water intermodal transportation/digestion tower wastewater recovery treatment system through the new pipeline, and the water intermodal transportation wastewater is sent to the desalted water supply system for recycling after being qualified by the water intermodal transportation/digestion tower wastewater recovery treatment system;
the desalted water supply system comprises a deaerator and a low-pressure boiler feed pump, the ethylbenzene rectification unit comprises a benzene tower, a B/T tower, an ethylbenzene tower, a polyethylbenzene tower and a light component tower, the styrene rectification unit comprises a benzene/toluene tower, a low-pressure crude styrene tower, a high-pressure crude styrene tower and a refined styrene tower, and the water intermodal transportation/digestion tower waste water recovery treatment system comprises a styrene settling tank, a first feed pump of a process condensate stripping tower, a second feed pump and an oil phase conveying pump;
the desalted water which is connected from the outside of the boundary is sent to a deaerator through a pipeline I to remove dissolved oxygen and then is sent to a low-pressure boiler feed pump, the low-pressure boiler feed pump is connected with a new pipeline II of a feed water main pipe, the new pipeline III and the new pipeline IV are connected with a pipeline III and a pipeline IV to be connected to an ethylbenzene rectification unit and a styrene rectification unit for water intermodal water supply, the ethylbenzene rectification unit and the styrene rectification unit sink water intermodal wastewater to a drainage main pipe seven 7 through a new pipeline V5 and a new pipeline V6, the drainage main pipe seven 7 sends the water intermodal wastewater to a styrene settling tank for wastewater oil-water separation, an oil phase is sent to a dehydrogenation liquid tank through an oil phase conveying pump, an aqueous phase is sent to a condensate stripping tower through a first water supply pump after preliminary separation of the styrene settling tank for further stripping and removing oil matters, the qualified water is sent to the deaerator through a process condensate filter to realize the recycling of desalted water, a small amount of wastewater contained in each tower of the styrene rectification unit (tar-containing treatment system) is sent to a dehydrogenation liquid tank for concentrated treatment, and the condensate generated by the rectification tank is sent to the original process condensate recovery flow during the water intermodal water transport;
the new added pipeline II 2 is a new added water intermodal water supply pipeline main pipe, a tee branch is connected to an outlet main pipe of a water supply pump of the low-pressure boiler to connect a new added pipeline III 3 and a new added pipeline IV 4, the new added pipeline III 3 and the new added pipeline IV are distributed to an ethylbenzene rectification unit and a styrene rectification unit along a pipeline corridor in the device, the new added pipeline III 3 is a branch pipeline from the new added water intermodal water supply main pipe II 2 to the ethylbenzene rectification unit and is used for water intermodal water supply of the ethylbenzene rectification unit, the new added pipeline III is connected to the ethylbenzene rectification unit for water supply of two pipelines, one branch pipeline is connected to a position of a benzene tower disqualified ethylbenzene regulating valve, and the water supply quantity to the benzene tower can be controlled through the regulating valve in the water intermodal process; the other path is a branch line which is arranged near the benzene tower reflux tank and reaches the SO port of the benzene tower reflux tank and is used for supplying water to the benzene tower reflux tank, the fourth added line 4 is a branch line from the second added water intermodal feed water header pipe to the styrene rectification unit and is used for supplying water to the styrene rectification unit, the fourth added line 4 is five paths of water supply from the styrene rectification unit, the first path is that the second added water header pipe 2 is connected with the branch line to the inlet of the dehydrogenation liquid tank feed valve, and the second path is that: and a branch pipeline is connected to the inlet of a feeding regulating valve of the low-pressure crude styrene tower through a newly added water supply header pipe II 2, and a third path is formed: and a branch line is connected to the inlet of the feeding regulating valve of the high-pressure crude styrene tower through a second newly added water supply header pipe 2, and the fourth path is as follows: and a branch line is connected to the SO port of the low-pressure condensing tower/collector through a second newly added water supply header pipe 2, and a fifth path is as follows: the branch line is connected to the SO port of the high-pressure condensing tower/collector through a second newly added water supply header pipe 2; after preliminary separation, the styrene settling tank is subjected to further steam stripping separation through a condensate steam stripping tower, and then the condensate is qualified, the condensate is pumped to a deaerator through a second water supply pump, and water supply to the outside of the tank and water supply to a waste boiler through a low-pressure boiler water supply pump are realized, so that flexible utilization of water, energy conservation and consumption reduction are realized;
the newly added pipeline six 6 is connected out through the outlet of each tower reflux pump of the styrene rectification unit, so that the pollution of DNBP in the tower kettle of the styrene rectification unit and in an unqualified system to water quality is avoided, DNBP is an active substance and is difficult to remove by steam stripping, DNBP is a heavy component substance in the water intermodal operation process, the DNBP is deposited in the tower kettle system, a small amount of waste water containing DNBP is finally sent to a dehydrogenation liquid tank for collection through a pipeline nine 9, the waste water containing DNBP in the tower kettle in the water intermodal operation process can be dehydrated by means of the styrene rectification unit before the later startup, and the DNBP is recovered, so that the purposes of energy conservation and environmental protection are achieved;
and (3) recycling a small amount of waste water containing DNBP by the water intermodal of the styrene rectifying unit, enabling the waste water to enter the styrene rectifying unit along with materials after the later start-up, wherein DNBP is a heavy component, and is reserved in a crude/refined styrene tower kettle system to perform a slow polymerization function on styrene so as to realize reutilization, and conveying the small amount of water to the dehydrogenation liquid tank along with a dehydration process of the tops of a low-pressure crude styrene tower and a high-pressure crude styrene tower so as to realize recycling of water.
The working principle of the application is as follows: the method can be used for dehydration by a styrene rectification unit before the later start-up, and simultaneously, DNBP is recovered for recycling;
a small amount of DNBP wastewater contained in the water intermodal transportation of the styrene rectifying unit is recovered by a dehydrogenation liquid tank, and enters the styrene rectifying unit along with materials after the later operation, DNBP is a heavy component and is left in a tower kettle system to perform a polymerization retarding effect on the styrene in the tower kettle, so that the reuse of DNBP is realized; the small amount of water is sent to a dehydrogenation liquid tank along with the dehydration flow of the tower top of the low-pressure crude styrene tower and the high-pressure crude styrene tower, so that the water is recycled.
Although embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the application, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The utility model provides a flow setting of styrene device intermodal transportation, cooking tower which characterized in that: when the water intermodal transportation of the styrene device starts working and testing for the first time, the water intermodal transportation is connected with desalted water from the outside and is sent to a desalted water supply system, after the desalted water is deoxidized by the desalted water supply system, the desalted water is sent to an ethylbenzene rectification unit and a styrene rectification unit through a new pipeline for water intermodal transportation, the ethylbenzene rectification unit and the styrene rectification unit send water intermodal transportation wastewater to a water intermodal transportation/digestion tower wastewater recovery treatment system through the new pipeline, and the water intermodal transportation wastewater is sent to the desalted water supply system for recycling after being qualified by the water intermodal transportation/digestion tower wastewater recovery treatment system;
the desalted water supply system comprises a deaerator and a low-pressure boiler feed pump, the ethylbenzene rectification unit comprises a benzene tower, a B/T tower, an ethylbenzene tower, a polyethylbenzene tower and a light component tower, the styrene rectification unit comprises a benzene/toluene tower, a low-pressure crude styrene tower, a high-pressure crude styrene tower and a refined styrene tower, and the water intermodal transportation/digestion tower waste water recovery treatment system comprises a styrene settling tank, a process condensate stripping tower, a first feed pump, a second feed pump and an oil phase conveying pump;
the desalted water which is connected from the outside is sent to a deaerator through a first pipeline (1) to remove dissolved oxygen and then is sent to a low-pressure boiler feed pump, the low-pressure boiler feed pump is connected with a new pipeline (2) of a feed water main pipe, a new pipeline (3) and a new pipeline (4) which are connected with the feed water main pipe are respectively connected with an ethylbenzene rectification unit and a styrene rectification unit through a new pipeline (5) and a new pipeline (6) to be used for water intermodal transportation, the ethylbenzene rectification unit and the styrene rectification unit are respectively connected with water intermodal transportation wastewater to a drain main pipe (7), the water intermodal transportation wastewater is sent to a styrene settling tank to be subjected to wastewater oil-water separation, an oil phase is sent to a dehydrogenation liquid tank through an oil phase conveying pump, an aqueous phase is sent to a process condensate stripping tower through a first feed water pump after primary separation of the styrene settling tank, further stripping oil phase substances are removed, qualified water is sent to the deaerator through a process condensate filter through a second feed water pump to be subjected to recycling, the styrene unit containing tar treatment system is sent to a small amount of wastewater to a dehydrogenation liquid tank to be concentrated treatment, and the condensate liquid is sent to a condensate liquid through a condensate tower (8) to be recycled during the process condensate liquid transportation and the condensate liquid is sent to the condensate liquid through a condensate tower.
2. The styrene unit water intermodal and digestion tower flow scheme of claim 1, wherein: the new pipeline II (2) is a new water intermodal transportation water supply pipeline main pipe, a tee branch is connected to an outlet main pipe of a water supply pump of the low-pressure boiler to connect a new pipeline III (3) and a new pipeline IV (4), the new pipeline III (3) and the new pipeline IV (4) are distributed to an ethylbenzene rectification unit and a styrene rectification unit along a pipe gallery in the device, the new pipeline III (3) is a branch pipeline from the new water intermodal transportation water supply main pipe II (2) to the ethylbenzene rectification unit and is used for water intermodal transportation water supply of the ethylbenzene rectification unit, the new pipeline III (3) to the ethylbenzene rectification unit supply water is two pipelines, one branch pipeline is connected to a position of a non-qualified ethylbenzene regulating valve of the benzene tower, and the water quantity of the benzene tower can be controlled by the regulating valve in the water intermodal transportation process; the other path is a branch pipeline which is arranged near the benzene tower reflux tank and is connected with the SO port of the benzene tower reflux tank for supplying water to the benzene tower reflux tank, the fourth added pipeline (4) is a branch pipeline from the second added water intermodal feed water main pipe (2) to the styrene rectification unit and is used for supplying water to the styrene rectification unit, the fourth added pipeline (4) is connected with the fifth added water supply pipeline from the fourth added water main pipe (2) to the styrene rectification unit, the first path is connected with the branch pipeline to the inlet of the dehydrogenation liquid tank feed regulating valve through the second added water main pipe (2), and the second path is as follows: and (3) connecting a branch pipeline to the inlet of a feeding regulating valve of the low-pressure crude styrene tower through a newly added water supply header pipe II (2), and a third path: and (3) connecting a branch line to the inlet of the feeding regulating valve of the high-pressure crude styrene tower through a newly added water supply header pipe II (2), and a fourth path: and (3) connecting a branch pipeline to the SO port of the condensing/collecting device of the low-pressure tower through a newly added water supply main pipe II (2), and a fifth path: and a branch pipeline is connected to the SO port of the condensing/collecting device of the high-pressure tower through a second newly added water supply header pipe (2).
3. The styrene unit water intermodal and digestion tower flow scheme of claim 1, wherein: after preliminary separation, the styrene settling tank is pumped to a condensate stripping tower through a first water supply pump for further stripping separation, and after the styrene settling tank is qualified, the styrene settling tank can also be sent to a deaerator through a process condensate filter through a second water supply pump, and water supply to the outside of the boundary is realized through a low-pressure boiler water supply pump.
4. A styrene unit water intermodal, digestion tower flowsheet set up as set forth in claim 3 wherein: after preliminary separation, the styrene settling tank is pumped to a process condensate stripping tower through a first water supply pump to perform further stripping separation, and after the styrene settling tank is qualified, the styrene settling tank can also be sent to a deaerator through a process condensate filter through a second water supply pump.
5. The styrene unit water intermodal and digestion tower flow scheme of claim 1, wherein: the newly added pipeline six (6) is connected out through the outlet of each tower reflux pump of the styrene rectifying unit, so that the pollution to water quality caused by DNBP in the tower kettle of the styrene rectifying unit and in an unqualified system is avoided, and finally a small amount of wastewater containing DNBP is sent to a dehydrogenation liquid tank for collection through a pipeline nine (9), the wastewater containing DNBP in the tower kettle in the water intermodal transportation process can be dehydrated by means of the styrene rectifying unit before the later operation, and DNBP is recovered, thereby achieving the purposes of energy conservation and environmental protection.
6. The styrene unit water intermodal and digestion tower flow scheme of claim 5, wherein: and (3) recycling a small amount of waste water containing DNBP by the water intermodal of the styrene rectifying unit, enabling the waste water to enter the styrene rectifying unit along with materials after the later start-up, wherein DNBP is a heavy component, and is reserved in a low-pressure crude styrene tower, a high-pressure crude styrene tower and a fine styrene tower to perform a polymerization retarding effect on styrene so as to realize reutilization, and conveying a small amount of water to a crude styrene settling tank along with the dehydration flow of the tops of the low-pressure crude styrene tower, the high-pressure crude styrene tower and the fine styrene tower so as to realize recycling of water.
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