CN111607431A - Online desalting device and method for fractionating tower top circulation system - Google Patents
Online desalting device and method for fractionating tower top circulation system Download PDFInfo
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- CN111607431A CN111607431A CN202010453639.0A CN202010453639A CN111607431A CN 111607431 A CN111607431 A CN 111607431A CN 202010453639 A CN202010453639 A CN 202010453639A CN 111607431 A CN111607431 A CN 111607431A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G53/00—Treatment of hydrocarbon oils, in the absence of hydrogen, by two or more refining processes
- C10G53/02—Treatment of hydrocarbon oils, in the absence of hydrogen, by two or more refining processes plural serial stages only
- C10G53/04—Treatment of hydrocarbon oils, in the absence of hydrogen, by two or more refining processes plural serial stages only including at least one extraction step
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G7/00—Distillation of hydrocarbon oils
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G7/00—Distillation of hydrocarbon oils
- C10G7/12—Controlling or regulating
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
- C10G2300/20—Characteristics of the feedstock or the products
- C10G2300/201—Impurities
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Abstract
The invention discloses an online desalting device and method for a fractionating tower top circulation system, wherein the device comprises a top circulation loop, a desalting circulation loop and a water injection desalting branch; the method comprises the steps of self-circulation of crude oil mixed liquor, circulation of a water injection desalting branch and the like. According to the online desalting device and method for the fractionating tower top circulation system, disclosed by the invention, on the premise of not influencing the normal operation of the fractionating tower top circulation system, the desalting of the whole fractionating tower top circulation system can not only prevent the reduction of the treatment capacity and the product quality of the fractionating tower top circulation system, but also reduce the waste of crude oil by refluxing an oil phase, and can also perform special environment-friendly treatment on subsequent sewage so as to ensure the safe long-period operation of the fractionating tower top circulation online desalting.
Description
Technical Field
The invention relates to the technical field of petrochemical industry, in particular to an online desalting device and method for a fractionating tower top circulation system.
Background
Along with the gradual deterioration of the properties of the raw materials, the higher and higher residue ratio, the continuous increase of nitrides and chlorides in the raw materials, the higher and higher proportion of the refinery processing high-acid high-sulfur heavy crude oil and the NH generation4CI、(NH4)SO4Dissolving ammonium salt in liquid water at the top of fractionating tower to form salt solution, and feeding into fractionating towerThe condensation and vaporization between the trays, the salt in the solution separated out and blocked the float valve, so the pressure drop in the tower is increased, the gas-liquid phase distribution on each layer of tray is uneven, the speed limit in the fractionating tower is too high, the tower flushing phenomenon frequently occurs, the top circulating pump is frequently evacuated, and the flash point of light diesel oil and the dry point of crude gasoline are difficult to control. The stable operation of the device is seriously influenced. Therefore, the removal of salt and water vapor from the overhead and overhead cycle oil is particularly important to slow salt formation and corrosion and to improve plant stability.
At present, a fractionating tower desalting method mainly comprises an online water washing method and a method for adding a salt deposition control agent, but the online water washing method influences the normal operation of a fractionating tower top circulation system, reduces the treatment capacity of the fractionating tower top circulation system and the product quality, generates a large amount of dirty oil and sewage during water washing, causes waste and is not environment-friendly. The method for adding the salt deposition control agent has overlarge dependence on the salt deposition control agent, has high requirement on the accuracy of the dosage of the salt deposition control agent, increases the salt deposition risk of the subsequent process if the method is slightly improper, and has high production cost and large dosage, thus invisibly increasing the operation cost. In conclusion, the existing desalting method of the fractionating tower has the problems of influencing the quantity and the quality of products in a circulating system at the top of the fractionating tower, being not environment-friendly, depending on a salt formation control agent too much and the like.
Disclosure of Invention
The invention aims to provide an online desalting device and method for a fractionating tower top circulation system, which are used for solving the problems that the normal operation of the fractionating tower top circulation system is influenced, the environment is not protected, the cost is overhigh and the like in the conventional desalting method for the fractionating tower.
The invention provides an online desalting device of a fractionating tower top circulation system, which comprises
The top circulation loop comprises a fractionating tower, an oil pump, a heat exchanger and an oil-water mixer, wherein a discharge port of the fractionating tower is communicated with a liquid inlet of the oil pump, a liquid outlet of the oil pump is communicated with an inlet of the oil-water mixer through the heat exchanger, and an outlet of the oil-water mixer is communicated with a feed back port of the fractionating tower;
the desalting circulation loop comprises a turbulent oil-water mixer, a liquid-liquid extraction phase separator and an oil-water separation tank, wherein an oil phase part and a water phase part which are separated from each other are arranged in the oil-water separation tank, the outlet of the heat exchanger is communicated with the main feed inlet of the turbulent oil-water mixer, the discharge port of the turbulent oil-water mixer is communicated with the feed inlet of the liquid-liquid extraction phase separator, the oil phase outlet of the liquid-liquid extraction phase separator is communicated with the oil phase inlet of the oil-water separation tank through an oil phase pipeline, the water phase outlet of the liquid-liquid extraction phase separator is communicated with the water phase inlet of the oil-water separation tank through a water phase pipeline, and the oil phase outlet of the oil-water separation tank is communicated with the inlet of the oil-water mixer;
the water injection desalination branch comprises a water storage tank and a water injection pump, wherein a water outlet of the water storage tank is connected with a water inlet of the water injection pump, and a water outlet of the water injection pump is communicated with an auxiliary feed inlet of the turbulent rotary mixer.
Preferably, the desalting circulation loop further comprises an ultrasonic oscillator, the ultrasonic oscillator is arranged between the turbulent oil-water mixer and the liquid-liquid extraction phase separator, and an inlet and an outlet of the ultrasonic oscillator are respectively communicated with the turbulent oil-water mixer and the liquid-liquid extraction phase separator.
Preferably, still include oily dehydration branch road, including first chemical injection pump and demulsifier storage jar, the discharge gate of demulsifier storage jar with the feed inlet of first chemical injection pump is linked together, the discharge gate of first chemical injection pump with liquid-liquid extraction phase separator with oil phase pipeline of oil water knockout drum is linked together.
Preferably, still include the sewage treatment branch road, the sewage treatment branch road includes sewage jar, opposition demulsifier storage jar and second chemical injection pump, the discharge gate of opposition demulsifier storage jar with the feed inlet of second chemical injection pump is linked together, the discharge gate of second chemical injection pump with the aqueous phase export of oil-water separation jar communicates to jointly the sewage inlet of sewage jar, the sewage inlet set up in the upper portion of sewage jar, sewage jar bottom is provided with the drain.
Preferably, the sewage discharge port of the sewage tank is provided with an online pH meter.
Preferably, an online corrosion probe and/or an online ultrasonic thickness gauge are arranged on two communicated pipelines between the oil-water mixer and the feed back port of the fractionating tower; and an online in-water oil analyzer is arranged at the bottom of the oil-water separation tank.
Preferably, the upper part of the sewage tank is also provided with a sewage tank oil phase outlet, and the sewage tank oil phase outlet is communicated with the inlet of the oil-water mixer.
The invention also relates to an online desalting method for the fractionating tower top circulation system, which adopts the online desalting device for the fractionating tower top circulation system and comprises the following steps:
the oil pump pumps out the mixed liquid of oil, water and salt at the bottom of the fractionating tower, the mixed liquid is divided into two paths after heat exchange and temperature reduction by the heat exchanger, one path returns to the fractionating tower through the oil-water mixer, and the other path flows into the turbulent oil-water mixer;
the water in the water storage tank is injected into the turbulent oil-water mixer through the water injection pump to dissolve ammonium salt in the original oil, water and salt mixed liquid, after the ammonium salt is extracted by the liquid-liquid extraction phase separator, the oil phase substance flows into the oil phase part of the oil-water separation tank from the liquid-liquid extraction phase separator through the oil phase pipeline, and returns to the fractionating tower after being mixed with the original oil, water and salt mixed liquid through the oil-water mixer, and the water phase substance flows into the water phase part of the oil-water separation tank from the water phase inlet through the water phase pipeline.
Preferably, the method further comprises the following steps:
a first chemical injection pump and a demulsifier storage tank are additionally arranged, a discharge hole of the demulsifier storage tank is communicated with a feed hole of the first chemical injection pump, and a discharge hole of the first chemical injection pump is communicated with the liquid-liquid extraction phase separator and an oil phase pipeline of the oil-water separation tank;
and in the process that the oil phase substance flows into the oil phase part of the oil-water separation tank from the liquid-liquid extraction phase separator through the oil phase pipeline, the first chemical injection pump is opened, and the demulsifier in the demulsifier storage tank is injected into the oil phase part of the oil-water separation tank through the oil phase pipeline.
Preferably, the method further comprises the following steps:
a sewage tank, a reverse demulsifier storage tank and a second chemical injection pump are additionally arranged, a discharge port of the reverse demulsifier storage tank is communicated with a feed port of the second chemical injection pump, a discharge port of the second chemical injection pump and a water phase outlet of the oil-water separation tank are communicated with a sewage inlet of the sewage tank together, the sewage inlet is arranged at the upper part of the sewage tank, and a sewage discharge outlet is arranged at the bottom of the sewage tank;
when the water phase substance extracted by the liquid-liquid extraction phase separator flows into the water phase part of the oil-water separation tank from the water phase inlet through the water phase pipeline, the second chemical injection pump is opened, and the reverse demulsifier in the reverse demulsifier storage tank is pumped into the sewage inlet of the sewage tank, so that the oil-water separation and the separation of harmful impurities in the sewage are realized.
The invention has the beneficial effects that:
the invention discloses an online desalting device and method for a fractionating tower top circulation system, wherein a desalting circulation loop and a water injection desalting branch thereof are established on the basis of the top circulation loop, ammonium salt in the original oil, water and salt mixed solution is dissolved through a water injection to turbulent oil-water mixer, sewage containing ammonium salt is removed through extracting an oil phase through a liquid-liquid extraction phase separator, and the oil phase in the mixed solution is refluxed to a fractionating tower for purification. According to the online desalting device and method for the fractionating tower top circulation system, disclosed by the invention, on the premise of not influencing the normal operation of the fractionating tower top circulation system, the desalting of the whole fractionating tower top circulation system can not only prevent the reduction of the treatment capacity and the product quality of the fractionating tower top circulation system, but also reduce the waste of crude oil by refluxing an oil phase, and can also perform special environment-friendly treatment on subsequent sewage so as to ensure the safe long-period operation of the fractionating tower top circulation online desalting. The device and the method are practical, convenient to operate, stable and reliable, reduce the corrosion risk of equipment, and are worthy of large-scale market popularization.
Drawings
FIG. 1 is a schematic structural diagram of an online desalting device of a fractionation tower top circulation system provided in example 1 of the present invention;
fig. 2 is a schematic structural diagram of an online desalting device of a fractionation tower top circulation system provided in embodiment 2 of the present invention.
Description of reference numerals: 1. a fractionating column; 2. drawing out the overhead circulating oil pipeline; 3, an oil pump; 4. a heat exchanger; 5. returning to the top of the tower for circulating oil; 6. turbulent oil-water mixer; 7. an ultrasonic oscillator; 8. a liquid-liquid extraction phase separator; 9. an oil-water separation tank; 10. a first chemical injection pump; 11. a demulsifier auxiliary tank; 12. a reverse demulsifier auxiliary tank; 13. a second chemical injection pump; 14. a sewage tank; 15. a water storage tank; 16. a water injection pump; 17. a mixer; 18. etching the probe on line; 19. an online ultrasonic thickness gauge; 20. an on-line pH meter.
Detailed Description
The invention is described in more detail below with reference to specific examples, without limiting the scope of the invention. Unless otherwise specified, the experimental methods adopted by the invention are all conventional methods, and experimental equipment, materials, reagents and the like used in the experimental method can be obtained from commercial sources.
Example 1
Example 1 provides an on-line desalting apparatus of a fractionation tower top circulation system, and the structure thereof will be described in detail below.
Referring to fig. 1, the fractionation column overhead system on-line desalination apparatus includes:
the top circulation loop comprises a fractionating tower 1, an oil pump 3, a heat exchanger 4, a top circulation oil extraction line 2, a top circulation oil return line 5 and an oil-water mixer 17, wherein a discharge port of the fractionating tower 1 is communicated with a liquid inlet of the oil pump 3 through the top circulation oil extraction line 2, a liquid outlet of the oil pump 3 is communicated with a heat medium inlet of the heat exchanger 4 through a pipeline, a heat medium outlet of the heat exchanger 4 is communicated with an inlet of the oil-water mixer 17 through the top circulation oil return line 5, and an outlet of the oil-water mixer 17 is communicated with a return port of the fractionating tower 1 through a pipeline to form the top circulation loop;
the desalting circulation loop comprises a turbulent rotation oil-water mixer 6, an ultrasonic oscillator 7, a liquid-liquid extraction phase separator 8 and an oil-water separation tank 9, wherein the turbulent rotation oil-water mixer 6 comprises a main feed inlet, an auxiliary feed inlet and a discharge outlet, the liquid-liquid extraction phase separator 8 is provided with a feed inlet, an oil phase outlet and a water phase outlet, the oil-water separation tank 9 is internally provided with an oil phase part and a water phase part which are separated from each other, the oil phase part of the oil-water separation tank 9 is provided with an oil phase inlet and an oil phase outlet, and the water phase part of the oil-water separation tank 9 is provided with a water phase inlet and a water. Specifically, a main feed inlet of a turbulent oil-water mixer 6 is communicated with a hot medium outlet of the heat exchanger 4, a discharge outlet of the turbulent oil-water mixer 6 is communicated with a feed inlet of the liquid-liquid extraction phase separator 8 through an ultrasonic oscillator 7, an oil phase outlet of the liquid-liquid extraction phase separator 8 is communicated with an oil phase inlet of the oil-water separation tank 9 through an oil phase pipeline, a water phase outlet of the liquid-liquid extraction phase separator 8 is communicated with a water phase inlet of the oil-water separation tank 9 through a water phase pipeline, and an oil phase outlet of the oil-water separation tank 9 is communicated with an inlet of the oil-water mixer 17 through a pipeline to form the desalting circulation loop;
the water injection desalting branch comprises a water storage tank 15 and a water injection pump 16, wherein a water outlet of the water storage tank 15 is connected with a water inlet of the water injection pump 16, and a water outlet of the water injection pump 16 is communicated with an auxiliary feed inlet of the turbulent-rotary mixer 6.
Wherein, heat exchanger 4 carries out the equipment of heat exchange as two kinds of media, has four interfaces, and its cold source import and cold source export all communicate the cold source, and the hot medium import of the hot mixed liquid heat transfer from heat exchanger 4 of water, salt and the oil that flows out from fractionating tower 1 flows into and flows out from the hot medium export of heat exchanger 4, and after the cold source heat transfer, the temperature step-down can prevent on the one hand that energy loss from playing energy-conserving effect, and on the other hand can also control the temperature of returning the mixed liquid of tower. The mixed liquid is divided into two paths after coming out from a hot medium outlet of the heat exchanger 4, one path flows to the oil-water mixer 17 through the oil return pipeline 5 at the top of the tower and finally returns to the fractionating tower 1, and the other path flows into the turbulent oil-water mixer 6. The water phase outlet and the oil phase outlet of the liquid-liquid extraction phase separator 8 are respectively connected with the oil-water separation tank 9, the oil phase and the water phase of the oil-water separation tank 9 respectively flow into the oil phase inlet and the water phase inlet of the oil-water separation tank 9 through the oil phase outlet and the water phase outlet respectively through an oil phase pipeline and a water phase pipeline, and the oil phase flows out of the oil phase outlet of the oil-water separation tank 9 and then flows back to the fractionating tower 1. The ultrasonic oscillator 7 mainly utilizes the coagulation effect and the viscosity reduction effect of ultrasonic waves on oil gas to enable water drops in the oil gas to be gathered and enlarged, so that the separation of oil and water phases is accelerated, and the demulsification effect of the oil gas is effectively improved. The invention has the main function of carrying out primary two-phase separation on oil gas and water and strengthening the desalting and dewatering effects.
In order to promote oily, the device still includes oily dehydration branch road, including first chemical injection pump 10 and demulsifier storage jar 11, the discharge gate of demulsifier storage jar 11 with the feed inlet of first chemical injection pump 10 is linked together, the discharge gate of first chemical injection pump 10 with liquid-liquid extraction phase separator 8 with oil phase pipeline of oil water knockout drum 9 is linked together. The demulsifier storage tank 11 stores a demulsifier which is used as a dehydrating agent and can remove water in crude oil and heavy oil to ensure that the water content meets the requirement.
In order to improve the environmental protection effect of the device, the device further comprises a sewage treatment branch, the sewage treatment branch comprises a sewage tank 14, a reverse demulsifier storage tank 12 and a second chemical injection pump 13, a discharge port of the reverse demulsifier storage tank 12 is communicated with a feed inlet of the second chemical injection pump 13, a discharge port of the second chemical injection pump 13 is communicated with a water phase outlet of the oil-water separation tank 9 to a sewage inlet of the sewage tank 14, the sewage inlet is arranged on the upper part of the sewage tank 14, and a sewage discharge outlet is arranged at the bottom of the sewage tank 14. The reverse demulsifier can effectively improve the interfacial tension of water-in-oil W/O or oil-in-water O/W emulsion, so that colloidal particles in sewage lose stable repulsive force and attractive force and finally lose stability to form flocs, and further, oil-water separation and separation of harmful impurities in the sewage are finally completed through chemical bridging, so that the purposes of recovering oil products and purifying the sewage are achieved, and the requirements of subsequent treatment processes on water quality or the national discharge requirements on the sewage are met.
In order to detect whether the discharged sewage reaches the standard, the sewage discharge port of the sewage tank 14 is provided with an online pH meter.
In order to detect the desalting effect in the oil phase mixed liquid flowing back to the fractionating tower 1, an online corrosion probe 18 and/or an online ultrasonic thickness gauge 19 are arranged on two communicated pipelines between the oil-water mixer 17 and the feed back port of the fractionating tower 1. Wherein the online corrosion probe 18 and the online ultrasonic thickness gauge 19 respectively judge whether the reflux oil phase mixed liquid is acidic or not by detecting probe variation and metal thickness variation, thereby determining the desalting effect.
In order to master the change of the oil proportion of the mixed liquid in real time, the bottom of the oil-water separation tank 9 is provided with an online oil-in-water analyzer.
Oil in the sewage is inevitable, and in order to collect the oil in the sewage, the upper part of the sewage tank 14 is also provided with a sewage tank oil phase outlet.
Example 2
To reduce the waste of source streams, example 2 is based on example 1 with oil flowing from the sump oil phase outlet being refluxed to the fractionation column 1.
Referring to fig. 2, specifically, the oil outlet of the sewage tank communicates with the inlet of the oil-water mixer 17.
The experiment applying the device shows that the temperature distribution in the whole fractionating tower is uniform, the fluctuation is not large, the device runs stably, the top circulation volume is stabilized at 340t/h, the reflux temperature is controlled at about 65 ℃, and the top circulation oil pump has no evacuation phenomenon. The oil product extraction temperature is 120-130 ℃, the oil product extraction amount is stable, no adverse effect is caused on the product yield and the quality of main products, no salt deposition phenomenon occurs in the process of 1 year of the operation of the device, no phenomena such as tower flushing, pump blockage and the like occur, and no salt deposition phenomenon occurs on a top circulation system tray after the inspection of a fractionating tower. The water content of the top circulating oil is reduced to 120-160 ppm from 1-2%, the monitoring data of an online corrosion probe of the top circulating system is reduced to 0.04mm/a from 0.42mm/a, the corrosion data of the ultrasonic fixed-point thickness measurement is less than 0.2mm/a, and the oil content of the brine-containing drainage is 25-60 ppm, so that the corrosion of equipment is greatly reduced, the resource waste is reduced, the difficulty of subsequent sewage treatment is reduced, the high economic value is generated, and the long-period safe and stable operation of the device is ensured.
Example 3
Embodiment 3 provides an online desalting method of a fractionating tower top circulation system, which adopts the online desalting device of the fractionating tower top circulation system of embodiment 2, and comprises the following steps:
self-circulation of crude oil mixed liquid: the oil pump 3 pumps out the mixed liquid of oil, water and salt at the bottom of the fractionating tower 1, the mixed liquid is divided into two paths after heat exchange and temperature reduction by the heat exchanger 4, one path returns to the fractionating tower 1 through the oil-water mixer 17, and the other path flows into the turbulent oil-water mixer 6;
water injection desalting branch circulation: the water in the water storage tank 15 is injected into the turbulent oil-water mixer 6 through the water injection pump 16 to dissolve ammonium salts in the original oil, water and salt mixed liquid, after the ammonium salts are extracted by the liquid-liquid extraction phase separator 8, oil phase substances flow into the oil phase part of the oil-water separation tank 9 from the liquid-liquid extraction phase separator 8 through an oil phase pipeline, and return to the fractionating tower 1 through the oil-water mixer 17, and water phase substances flow into the water phase part of the oil-water separation tank 9 from a water phase inlet through a water phase pipeline.
In order to improve the oil quality, in the process that oil phase substances flow into the oil phase part of the oil-water separation tank 9 from the liquid-liquid extraction phase separator 8 through an oil phase pipeline, the first chemical injection pump 10 is opened, the demulsifier in the demulsifier storage tank 11 is injected into the oil phase part of the oil-water separation tank 9 through the oil phase pipeline, so that the water in the crude oil is removed, and the flow of the demulsifier is adjusted according to the water content in the oil phase, so that the water content meets the requirement.
In order to improve the environmental protection effect of the device, the sewage treatment in the desalting mixed liquor comprises the following steps:
when the water phase substance extracted by the liquid-liquid extraction phase separator 8 flows into the water phase part of the oil-water separation tank 9 from the water phase inlet through the water phase pipeline, the second chemical injection pump 13 is opened, the reverse demulsifier in the reverse demulsifier storage tank 12 is pumped into the sewage inlet of the sewage tank 14, so that oil-water separation and harmful impurity separation in the sewage are realized, and the flow of the reverse demulsifier is adjusted according to the analysis data of the online in-water oil analyzer at the bottom of the oil-water separation tank 9, so as to meet the requirements of subsequent treatment procedures on water quality or meet the national discharge requirements on the sewage.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. An online desalting device of a fractionating tower top circulation system is characterized by comprising
The top circulation loop comprises a fractionating tower (1), an oil pump (3), a heat exchanger (4) and an oil-water mixer (17), wherein a discharge port of the fractionating tower (1) is communicated with a liquid inlet of the oil pump (3), a liquid outlet of the oil pump (3) is communicated with an inlet of the oil-water mixer (17) through the heat exchanger (4), and an outlet of the oil-water mixer (17) is communicated with a feed back port of the fractionating tower (1);
the desalting circulation loop comprises a turbulent oil-water mixer (6), a liquid-liquid extraction phase separator (8) and an oil-water separation tank (9), wherein an oil phase part and a water phase part which are separated from each other are arranged in the oil-water separation tank (9), an outlet of the heat exchanger (4) is communicated with a main feed inlet of the turbulent oil-water mixer (6), a discharge port of the turbulent oil-water mixer (6) is communicated with a feed inlet of the liquid-liquid extraction phase separator (8), an oil phase outlet of the liquid-liquid extraction phase separator (8) is communicated with an oil phase inlet of the oil-water separation tank (9) through an oil phase pipeline, a water phase outlet of the liquid-liquid extraction phase separator (8) is communicated with a water phase inlet of the oil-water separation tank (9) through a water phase pipeline, and an oil phase outlet of the oil-water separation tank (9) is communicated with an inlet of the oil-water mixer (17);
the water injection desalination branch road includes water storage tank (15) and water injection pump (16), the delivery port of water storage tank (15) with the water inlet of water injection pump (16) links to each other, the delivery port of water injection pump (16) with the vice feed inlet of torrent mixer (6) is linked together.
2. The fractionation overhead circulation system in-line demineralization apparatus of claim 1,
the desalting circulation loop further comprises an ultrasonic oscillator (7), the ultrasonic oscillator (7) is arranged between the turbulent cyclone oil-water mixer (6) and the liquid-liquid extraction phase separator (8), and the inlet and the outlet of the ultrasonic oscillator (7) are respectively communicated with the turbulent cyclone oil-water mixer (6) and the liquid-liquid extraction phase separator (8).
3. The online desalter of claim 1, further comprising an oil dehydration branch comprising a first chemical injection pump (10) and a demulsifier storage tank (11), wherein the outlet of the demulsifier storage tank (11) is communicated with the inlet of the first chemical injection pump (10), and the outlet of the first chemical injection pump (10) is communicated with the oil phase pipes of the liquid-liquid extraction phase separator (8) and the oil-water separation tank (9).
4. The fractionation tower top circulation system online desalination plant of claim 1, further comprising a wastewater treatment branch comprising a wastewater tank (14), a reverse emulsion breaker storage tank (12) and a second chemical injection pump (13),
a discharge hole of the reverse demulsifier storage tank (12) is communicated with a feed hole of the second chemical injection pump (13), a discharge hole of the second chemical injection pump (13) and a water phase outlet of the oil-water separation tank (9) are communicated with a sewage inlet of the sewage tank (14) together, the sewage inlet is arranged at the upper part of the sewage tank (14),
a sewage draining outlet is arranged at the bottom of the sewage tank (14).
5. The fractionation overhead circulation system in-line desalting apparatus according to claim 4,
and an online pH meter is arranged at the sewage outlet of the sewage tank (14).
6. The fractionation overhead circulation system in-line demineralization apparatus of claim 1,
an online corrosion probe (18) and/or an online ultrasonic thickness gauge (19) are arranged on two communicated pipelines between the oil-water mixer (17) and the feed back port of the fractionating tower (1);
the bottom of the oil-water separation tank (9) is provided with an online oil-in-water analyzer.
7. The fractionation overhead circulation system in-line desalting apparatus according to claim 4,
the upper part of the sewage tank (14) is also provided with a sewage tank oil phase outlet which is communicated with the inlet of the oil-water mixer (17).
8. An on-line desalting method of a fractionation overhead circulation system using the on-line desalting apparatus of a fractionation overhead circulation system according to any one of claims 1 to 7, comprising the steps of:
the oil pump (3) pumps out the mixed liquid of oil, water and salt at the bottom of the fractionating tower (1), the mixed liquid is divided into two paths after heat exchange and temperature reduction by the heat exchanger (4), one path returns to the fractionating tower (1) through the oil-water mixer (17), and the other path flows into the turbulent oil-water mixer (6);
water in the water storage tank (15) is injected into the turbulent oil-water mixer (6) through a water injection pump (16) to dissolve ammonium salt in the original oil, water and salt mixed liquid, after the ammonium salt is extracted by the liquid-liquid extraction phase separator (8), oil phase substances flow into the oil phase part of the oil-water separation tank (9) from the liquid-liquid extraction phase separator (8) through an oil phase pipeline, are mixed with the original oil, water and salt mixed liquid through the oil-water mixer (17) and then return to the fractionating tower (1), and water phase substances flow into the water phase part of the oil-water separation tank (9) from a water phase inlet through a water phase pipeline.
9. The fractionation overhead system online desalination method of claim 8, further comprising the steps of:
a first chemical injection pump (10) and a demulsifier storage tank (11) are additionally arranged, the discharge hole of the demulsifier storage tank (11) is communicated with the feed hole of the first chemical injection pump (10), and the discharge hole of the first chemical injection pump (10) is communicated with the oil phase pipeline of the liquid-liquid extraction phase separator (8) and the oil-water separation tank (9);
in the process that the oil phase substance flows into the oil phase part of the oil-water separation tank (9) from the liquid-liquid extraction phase separator (8) through the oil phase pipeline, the first chemical injection pump (10) is opened, and the demulsifier in the demulsifier storage tank (11) is injected into the oil phase part of the oil-water separation tank (9) through the oil phase pipeline.
10. The fractionation overhead system online desalination method of claim 8, further comprising the steps of:
a sewage tank (14), a reverse demulsifier storage tank (12) and a second chemical injection pump (13) are additionally arranged, a discharge port of the reverse demulsifier storage tank (12) is communicated with a feed port of the second chemical injection pump (13), a discharge port of the second chemical injection pump (13) and a water phase outlet of the oil-water separation tank (9) are communicated to a sewage inlet of the sewage tank (14), the sewage inlet is arranged at the upper part of the sewage tank (14), and a sewage outlet is arranged at the bottom of the sewage tank (14);
when the water phase substance extracted by the liquid-liquid extraction phase separator (8) flows into the water phase part of the oil-water separation tank (9) from the water phase inlet through the water phase pipeline, the second chemical injection pump (13) is opened, and the reverse demulsifier in the reverse demulsifier storage tank (12) is pumped into the sewage inlet of the sewage tank (14), so that the oil-water separation and the separation of harmful impurities in the sewage are realized.
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