CN111871338A - Intelligent micro-interface reaction system and method for diesel hydrogenation - Google Patents
Intelligent micro-interface reaction system and method for diesel hydrogenation Download PDFInfo
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- 238000005984 hydrogenation reaction Methods 0.000 title claims abstract description 114
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 77
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000000047 product Substances 0.000 claims abstract description 48
- 238000000926 separation method Methods 0.000 claims abstract description 38
- 239000002283 diesel fuel Substances 0.000 claims abstract description 37
- 239000007788 liquid Substances 0.000 claims abstract description 35
- 239000007789 gas Substances 0.000 claims abstract description 34
- 239000001257 hydrogen Substances 0.000 claims abstract description 34
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 34
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000003054 catalyst Substances 0.000 claims abstract description 26
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000007795 chemical reaction product Substances 0.000 claims abstract description 10
- 229910000037 hydrogen sulfide Inorganic materials 0.000 claims abstract description 10
- 230000003009 desulfurizing effect Effects 0.000 claims description 28
- 239000003921 oil Substances 0.000 claims description 21
- 239000012071 phase Substances 0.000 claims description 20
- 238000000746 purification Methods 0.000 claims description 18
- 238000006477 desulfuration reaction Methods 0.000 claims description 16
- 230000023556 desulfurization Effects 0.000 claims description 16
- 230000000694 effects Effects 0.000 claims description 15
- 238000012546 transfer Methods 0.000 claims description 13
- 239000007791 liquid phase Substances 0.000 claims description 12
- 238000007670 refining Methods 0.000 claims description 9
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 8
- 230000033228 biological regulation Effects 0.000 claims description 7
- 238000005194 fractionation Methods 0.000 claims description 7
- 229910052717 sulfur Inorganic materials 0.000 claims description 7
- 239000011593 sulfur Substances 0.000 claims description 7
- 150000002431 hydrogen Chemical class 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 5
- 239000000945 filler Substances 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 239000008161 low-grade oil Substances 0.000 claims description 2
- 238000005265 energy consumption Methods 0.000 abstract description 11
- 239000002994 raw material Substances 0.000 abstract description 7
- 239000012467 final product Substances 0.000 abstract 1
- 239000003513 alkali Substances 0.000 description 8
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 6
- 239000006185 dispersion Substances 0.000 description 5
- 238000003860 storage Methods 0.000 description 5
- 238000007599 discharging Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000009903 catalytic hydrogenation reaction Methods 0.000 description 2
- 238000006555 catalytic reaction Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 229910017318 Mo—Ni Inorganic materials 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 229910000287 alkaline earth metal oxide Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
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- 238000006062 fragmentation reaction Methods 0.000 description 1
- 239000007792 gaseous phase Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000005191 phase separation Methods 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 229910001404 rare earth metal oxide Inorganic materials 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/008—Details of the reactor or of the particulate material; Processes to increase or to retard the rate of reaction
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/02—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with stationary particles, e.g. in fixed beds
- B01J8/04—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with stationary particles, e.g. in fixed beds the fluid passing successively through two or more beds
- B01J8/0446—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with stationary particles, e.g. in fixed beds the fluid passing successively through two or more beds the flow within the beds being predominantly vertical
-
- 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
- C10G45/00—Refining of hydrocarbon oils using hydrogen or hydrogen-generating compounds
- C10G45/02—Refining of hydrocarbon oils using hydrogen or hydrogen-generating compounds to eliminate hetero atoms without changing the skeleton of the hydrocarbon involved and without cracking into lower boiling hydrocarbons; Hydrofinishing
-
- 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
- C10G2300/202—Heteroatoms content, i.e. S, N, O, P
-
- 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
- C10G2400/00—Products obtained by processes covered by groups C10G9/00 - C10G69/14
- C10G2400/04—Diesel oil
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
The invention provides an intelligent micro-interface reaction system and method for diesel hydrogenation, wherein the intelligent micro-interface reaction system comprises: the hydrogenation reactor is internally provided with a plurality of sections of fixed bed layers from top to bottom in sequence, and the fixed bed layers are filled with catalysts; a micro-interface generator is arranged between the adjacent fixed bed layers, and a hydrogen inlet is formed in the micro-interface generator; a product outlet is formed in the side wall of the hydrogenation reactor, and the product outlet is connected with the hydrofining reactor to carry out deep hydrogenation reaction; and introducing a reaction product discharged from the bottom of the hydrofining reactor into a gas-liquid separation tank to separate a gas phase containing hydrogen sulfide and hydrogen from the product, and obtaining the final product desulfurized diesel oil. After the intelligent micro-interface reaction system provided by the invention is combined with the micro-interface generator, the energy consumption is reduced, the reaction temperature is reduced, the reaction yield is improved, the utilization rate of raw materials is improved, particularly the utilization rate of hydrogen is improved, and meanwhile, the productivity is effectively improved.
Description
Technical Field
The invention relates to the field of diesel hydrogenation, in particular to an intelligent micro-interface reaction system and method for diesel hydrogenation.
Background
With the increasing awareness of environmental protection and stricter environmental regulations, the production and use of clean vehicle fuels become a trend, and the development of deep hydrodesulfurization technology for diesel oil becomes a hot spot of current research. At present, most diesel oil hydrofining devices exchange heat between raw oil and refined diesel oil and reaction products, heat the raw oil to the reaction required temperature through a heating furnace, and then hydrogenate the raw oil.
In addition, as informatization is developed more and more rapidly, the application of an intelligent system is more and more extensive, errors are easy to occur by adopting a manual control mode, and the labor cost is higher.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The first purpose of the invention is to provide an intelligent micro-interface reaction system for diesel hydrogenation, which combines a hydrogenation reactor and a micro-interface generator, thereby reducing energy consumption, reducing reaction temperature, improving reaction yield, improving utilization rate of raw materials, especially improving utilization rate of hydrogen, effectively improving productivity, further improving product quality and yield, and also saving equipment cost and equipment floor area.
Meanwhile, the intelligent micro-interface reaction system can realize the whole process of acquisition, analysis and correction of the operating parameters of the micro-interface reaction system, does not need manual control, reduces the error rate, improves the production efficiency, reduces the labor cost, and is worthy of wide popularization and application.
The second purpose of the invention is to provide a method for carrying out diesel hydrodesulfurization by adopting the intelligent micro-interface reaction system, the desulfurized diesel obtained by the reaction is environment-friendly and clean, has enough power as fuel, is widely applied, and improves the application range of the desulfurized diesel.
In order to achieve the above purpose of the present invention, the following technical solutions are adopted:
the invention provides an intelligent micro-interface reaction system for diesel hydrogenation, which comprises: the hydrogenation reactor is internally provided with a plurality of sections of fixed bed layers from top to bottom in sequence, and the fixed bed layers are filled with catalysts; a micro-interface generator is arranged between the adjacent fixed bed layers, and a hydrogen inlet is formed in the micro-interface generator;
a product outlet is formed in the side wall of the hydrogenation reactor, and the product outlet is connected with the hydrofining reactor to carry out deep hydrogenation reaction;
reaction product that hydrofining reactor bottom came lets in the gas-liquid separation jar in order to contain the gas phase separation back of hydrogen sulfide, hydrogen, the desulfurization diesel oil is followed the bottom of gas-liquid separation jar is gone to the stripper and is used for the purification of desulfurization diesel oil, the top of stripper is provided with first knockout drum and is used for separating out sulfur-containing oil gas and low minute oil, is located liquid phase circulation in the first knockout drum gets back to the further purification of stripper is handled.
The intelligent micro-interface reaction system also comprises an intelligent system, wherein the intelligent system comprises a data acquisition module, a comparison module and an intelligent regulation module, the data acquisition module sends the acquired specific system operation parameters to the comparison module, and the comparison module compares the data and sends the parameters adjusted after comparison to the intelligent regulation module so as to adjust the operation parameters of the micro-interface reaction system.
The intelligent micro-interface reaction system realizes intelligent adjustment of each operating parameter of the reaction system by introducing the intelligent system, firstly acquires the operating data of the whole reaction system through the data acquisition module and then transmits the operating data to the comparison module, and then the comparison module gives the most appropriate operating parameter according to the current working condition through an intelligent analysis mode and feeds the most appropriate operating parameter back to the intelligent adjustment module, thereby achieving the purpose of intelligently adjusting the operating parameter.
Preferably, the intelligent regulation module comprises a hydrogenation reactor pressure control unit, a hydrofining reactor pressure control unit and a desulfurizing tower temperature control unit;
preferably, the data acquisition module is connected with the comparison module in a wireless manner.
Corresponding intelligent modules can be arranged on more important control points in the whole process to realize intelligent adjustment, and the whole intelligent system can adopt a wireless mode to connect all the modules for intelligent control.
The temperature and pressure of key equipment such as a hydrogenation reactor, a hydrofining reactor and a desulfurizing tower can be monitored intelligently and can be detected and controlled.
According to the intelligent micro-interface reaction system for diesel hydrogenation, the micro-interface generator is arranged in the hydrogenation reactor, and the entering hydrogen is dispersed and crushed into micro bubbles, so that the mass transfer effect is improved.
In addition, above-mentioned intelligent micro-interface reaction system has set up the strip tower behind the gas-liquid separation jar, and the side of strip tower lets in hot steam, separates out light component and the oil gas that contains sulphur in the oil through the mode of strip, finally separates out through the first knockout drum at strip tower top, has reached the further purification to the desulfurization diesel oil product. However, the liquid phase which is not separated in the first separator tank is returned to the stripper for further stripping treatment.
Moreover, the micro-interface generator is arranged in the hydrogenation reactor, preferably uniformly arranged between the adjacent fixed bed layers in a straight line in sequence along the vertical direction, the arrangement mode can ensure that the diesel oil catalytic hydrogenation effect of the gap between the two fixed bed layers is better when the hydrodesulfurization reaction is carried out, namely, the dispersion crushing and the catalytic reaction are carried out simultaneously, so that the dispersion crushing operation is more closely related to the reaction, in addition, the catalyst added in the catalytic hydrogenation reaction is solid, therefore, the filling mode is adopted for filling the catalyst into the reactor, the dispersion crushing is mainly used for matching with the improvement of the catalytic reaction effect and reducing the energy consumption, therefore, the optimal mode of the micro-interface generator is also arranged in the reactor in view of the arrangement of the catalyst in the reactor, and the arrangement of the micro-interface generator in the hydrogenation reactor is most favorable for improving the mass transfer effect, therefore, the setting position of the micro-interface generator is also obtained through practical design, and the specific design is needed according to different characteristics of different reactions.
Preferably, the number of the fixed bed layers is 3, the number of the micro interface generators is 3, two of the micro interface generators are arranged between the two fixed bed layers, and the other micro interface generator is arranged at the bottom in the hydrogenation reactor. The number of 3 micro-interface generators already ensures the effect of dispersive disruption.
The micro-interface generator arranged in the hydrogenation reactor is of a pneumatic type, and the mass transfer effect is improved by a mode that hydrogen is introduced into the micro-interface generator and then is directly crushed with straight-run diesel oil to form micro bubbles.
Certainly, in addition to the micro interface generator arranged inside the hydrogenation reactor, the micro interface generator can also be correspondingly arranged inside the subsequent hydrofining reactor to achieve the effects of correspondingly reducing energy consumption and improving the utilization rate of raw materials, and meanwhile, the micro interface generator is arranged inside the hydrogenation reactor and the hydrofining reactor, so that the reaction efficiency can be improved, and the energy consumption of the reaction can be reduced.
It will be appreciated by those skilled in the art that the micro-interface generator used in the present invention is described in the prior patents of the present inventor, such as the patents of application nos. CN201610641119.6, 201610641251.7, CN201710766435.0, CN106187660, CN105903425A, CN109437390A, CN205833127U and CN 207581700U. The detailed structure and operation principle of the micro bubble generator (i.e. micro interface generator) is described in detail in the prior patent CN201610641119.6, which describes that "the micro bubble generator comprises a body and a secondary crushing member, wherein the body is provided with a cavity, the body is provided with an inlet communicated with the cavity, the opposite first end and second end of the cavity are both open, and the cross-sectional area of the cavity decreases from the middle of the cavity to the first end and second end of the cavity; the secondary crushing member is disposed at least one of the first end and the second end of the cavity, a portion of the secondary crushing member is disposed within the cavity, and an annular passage is formed between the secondary crushing member and the through holes open at both ends of the cavity. The micron bubble generator also comprises an air inlet pipe and a liquid inlet pipe. "the specific working principle of the structure disclosed in the application document is as follows: liquid enters the micro-bubble generator tangentially through the liquid inlet pipe, and gas is rotated at a super high speed and cut to break gas bubbles into micro-bubbles at a micron level, so that the mass transfer area between a liquid phase and a gas phase is increased, and the micro-bubble generator in the patent belongs to a pneumatic micro-interface generator.
In addition, the first patent 201610641251.7 describes that the primary bubble breaker has a circulation liquid inlet, a circulation gas inlet and a gas-liquid mixture outlet, and the secondary bubble breaker communicates the feed inlet with the gas-liquid mixture outlet, which indicates that the bubble breakers all need to be mixed with gas and liquid, and in addition, as can be seen from the following drawings, the primary bubble breaker mainly uses the circulation liquid as power, so that the primary bubble breaker belongs to a hydraulic micro-interface generator, and the secondary bubble breaker simultaneously introduces the gas-liquid mixture into an elliptical rotating ball for rotation, thereby realizing bubble breaking in the rotating process, so that the secondary bubble breaker actually belongs to a gas-liquid linkage micro-interface generator. In fact, the micro-interface generator is a specific form of the micro-interface generator, whether it is a hydraulic micro-interface generator or a gas-liquid linkage micro-interface generator, however, the micro-interface generator adopted in the present invention is not limited to the above forms, and the specific structure of the bubble breaker described in the prior patent is only one of the forms that the micro-interface generator of the present invention can adopt. Furthermore, the prior patent 201710766435.0 states that the principle of the bubble breaker is that high-speed jet flows are used to achieve mutual collision of gases, and also states that the bubble breaker can be used in a micro-interface strengthening reactor to verify the correlation between the bubble breaker and the micro-interface generator; moreover, in the prior patent CN106187660, there is a related description on the specific structure of the bubble breaker, see paragraphs [0031] to [0041] in the specification, and the accompanying drawings, which illustrate the specific working principle of the bubble breaker S-2 in detail, the top of the bubble breaker is a liquid phase inlet, and the side of the bubble breaker is a gas phase inlet, and the liquid phase coming from the top provides the entrainment power, so as to achieve the effect of breaking into ultra-fine bubbles, and in the accompanying drawings, the bubble breaker is also seen to be of a tapered structure, and the diameter of the upper part is larger than that of the lower part, and also for better providing the entrainment power for the liquid phase.
Since the micro-interface generator was just developed in the early stage of the prior patent application, the micro-interface generator was named as a micro-bubble generator (CN201610641119.6), a bubble breaker (201710766435.0) and the like in the early stage, and is named as a micro-interface generator in the later stage along with the continuous technical improvement, and the micro-interface generator in the present invention is equivalent to the micro-bubble generator, the bubble breaker and the like in the prior art, and has different names.
In summary, the micro-interface generator of the present invention belongs to the prior art, although some bubble breakers belong to the type of pneumatic bubble breakers, some bubble breakers belong to the type of hydraulic bubble breakers, and some bubble breakers belong to the type of gas-liquid linkage bubble breakers, the difference between the types is mainly selected according to the different specific working conditions, and in addition, the connection between the micro-interface generator and the reactor and other equipment, including the connection structure and the connection position, is determined according to the structure of the micro-interface generator, which is not limited.
Preferably, the hydrogenation reactor for hydrogenation reaction is a fixed bed reactor, the catalyst in the fixed bed reactor is fixed on the bed layer, the catalyst for hydrogenation reaction is generally nickel-based catalyst, preferably the catalyst can be supported nickel-based catalyst, or nickel-based catalyst modified by alkaline earth metal oxide or rare earth metal oxide is more preferable.
Preferably, the type of the hydrofinishing reactor is also a fixed bed reactor, and the type of the catalyst selected may or may not be identical to the type of the catalyst selected for the hydrogenation reactor.
In addition, the catalyst usage in the hydrogenation reactor and the hydrofining reactor can be determined according to the property of the raw oil, the product quality requirement and the catalyst property, and the catalyst usage in the hydrogenation reactor is generally less than the catalyst usage in the hydrofining reactor, because the preliminary reaction is performed in the previous hydrogenation reactor, the deep reaction is performed in the subsequent hydrofining reactor, and the reaction efficiency can be improved after the micro-interface generator is added in the hydrogenation reactor, so that the catalyst usage can be properly reduced without affecting the normal operation of the hydrogenation reaction. The volume ratio of the catalyst used in the hydrogenation reactor to the catalyst used in the hydrofining reactor can be (1:12) - (1: 15).
Preferably, the bottom of the stripping tower is provided with a stripped product outlet which is connected with a fractionating tower for purifying and separating the desulfurized diesel oil. The stripping effect of the desulfurized diesel oil from the gas-liquid separation tank in the stripping tower is mainly to separate sulfur-containing oil gas and low-fraction oil phase in oil products, and the desulfurized diesel oil after being stripped is sent to the fractionating tower for further purification and separation.
Preferably, the top of the fractionating tower is provided with a second separation tank for separating naphtha and part of sulfur-containing oil gas, and the liquid phase in the second separation tank is recycled to the fractionating tower for further purification treatment. The light components (including naphtha and part of the sour gas) in the second separation tank at the top of the fractionation tower are passed out for further processing in other processing.
Preferably, the bottom of the fractionation column is provided with a product outlet, which is transported to a product tank by a transfer pump. The product outlet at the bottom of the fractionating tower is relatively pure desulfurized diesel oil which can be directly stored in a finished product tank.
Preferably, a cooler is arranged between the delivery pump and the finished product tank, and the cooler is used for cooling the oil product subjected to stripping and fractionation treatment so as to facilitate subsequent storage.
In addition, a heater is arranged between the stripping tower and the fractionating tower, so that the fractionated oil can be preheated, and the energy consumption in the fractionating tower is reduced.
Preferably, the top of the gas-liquid separation tank is provided with a gas phase outlet, and the gas phase outlet is connected with a desulfurizing tower to realize the absorption of hydrogen sulfide in a gas phase. The top in the desulfurizing tower is provided with a desulfurizing agent spraying opening, and multilayer fillers are distributed in the desulfurizing tower to increase the mass transfer effect.
Reaction products after hydrogenation reaction are introduced into the gas-liquid separation tank, hydrogen sulfide and hydrogen are discharged from the top of the gas-liquid separation tank and go to the desulfurizing tower to remove the hydrogen sulfide, and a liquid phase is discharged from the bottom of the gas-liquid separation tank and goes to the stripping tower.
Preferably, a desulfurizer circulating tank is arranged beside the desulfurizing tower, the desulfurizer circulating tank is connected with the lower part of the side wall of the desulfurizing tower through a pipeline, and the top of the desulfurizer circulating tank is connected with the desulfurizer spraying opening through a pipeline.
The desulfurizer is generally selected from alkali liquor, the alkali liquor circularly enters the desulfurizing tower and reversely contacts with a gas phase entering from the bottom of the desulfurizing tower, the desulfurizing tower is sprayed and absorbed to realize desulfurization, the desulfurized alkali liquor returns to the desulfurizer circulating tank, and when the pollution is serious in the process of circularly using the alkali liquor in the desulfurizer circulating tank, the desulfurizer is stopped and replaced.
Preferably, each hydrogen inlet is connected with a hydrogen main pipeline after being converged, the hydrogen main pipeline is connected with a hydrogen storage tank, and the hydrogen recovered from the top of the desulfurizing tower is converged with the hydrogen main pipeline through a pipeline.
Preferably, a heater is arranged between the hydrogenation reactor and the hydrofining reactor to heat the product from the product outlet. Because the hydrogenation reaction is generally higher in temperature, the arrangement of the heater between the two reactors can improve the reaction efficiency and correspondingly reduce the energy consumption of the reactors.
Preferably, the reaction product from the bottom of the hydrorefining reactor is cooled by a heat exchanger and then enters the gas-liquid separation tank.
Preferably, the bottom of the hydrogenation reactor is provided with a straight-run diesel oil inlet, and the straight-run diesel oil inlet is connected with the heat exchanger through a pipeline so as to heat the straight-run diesel oil and then enter the hydrogenation reactor. The heat exchanger is arranged to realize the heat exchange between the reaction product after the hydrogenation and the entering straight-run diesel oil.
The intelligent micro-interface reaction system can be provided with a pump body on a pipeline connected between corresponding devices according to actual needs.
The invention also provides a reaction method for diesel hydrogenation, which comprises the following steps:
dispersing and crushing a mixed micro interface of straight-run diesel oil and hydrogen, performing hydrogenation reaction, refining and hydrogenating, and sequentially performing gas-liquid separation, steam stripping and fractionation;
in the operation process of the reaction system, the data acquisition module sends the acquired operation parameters of the reaction system to the comparison module, and the comparison module sends the set parameters to the intelligent adjustment module after analyzing the data so as to adjust the operation parameters of the reaction system.
Preferably, the pressure of the hydrogenation reaction is 2-8MPa, and the temperature of the hydrogenation reaction is 250-320 ℃. Most preferably, the pressure of the hydrogenation reaction is 3.5MPa and the temperature of the hydrogenation reaction is 300 ℃.
Preferably, the pressure of the refining hydrogenation reaction is 2-8MPa, and the temperature of the refining hydrogenation reaction is 250-320 ℃. Most preferably, the pressure of the purification hydrogenation reaction is 3.5MPa and the temperature of the purification hydrogenation reaction is 300 ℃.
In the above reaction method, since the raw material is not previously dispersed and crushed as in the hydrogenation reaction before the purification hydrogenation reaction, the reaction pressure and reaction temperature are slightly higher than the temperature and pressure of the hydrogenation reaction in actual operation.
The desulfurized diesel oil obtained by the diesel oil hydrogenation reaction has good quality and high yield, and the desulfurization rate can reach 99.95 percent.
The reaction method for diesel hydrogenation has the advantages of low reaction temperature, greatly reduced pressure, high liquid hourly space velocity, capacity improvement, and nearly 100% of final desulfurization rate, which is improved by nearly 1%.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the intelligent micro-interface reaction system for diesel hydrogenation, the hydrogenation reactor and the micro-interface generator are combined, so that the energy consumption is reduced, the reaction temperature is reduced, the reaction yield is improved, and the utilization rate of raw materials is improved;
(2) the intelligent micro-interface reaction system for diesel hydrogenation is most beneficial to improving the mass transfer effect by arranging the micro-interface generator at a specific position;
(3) the intelligent micro-interface reaction system for diesel hydrogenation realizes heat exchange between a reaction product after hydrogenation and entering straight-run diesel by arranging the heat exchanger;
(4) the reaction method for diesel hydrogenation has the advantages of low reaction temperature, greatly reduced pressure, high liquid hourly space velocity, capacity improvement, and nearly 100% of final desulfurization rate, which is improved by nearly 1%.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a schematic structural diagram of an intelligent micro-interface reaction system for diesel hydrogenation according to an embodiment of the present invention.
Description of the drawings:
10-a hydrogenation reactor; 101-a micro-interface generator;
102-fixed bed layer; 103-hydrogen inlet;
104-straight-run diesel oil inlet; 105-a product outlet;
20-a hydrofining reactor; 30-a heater;
40-a heat exchanger; 50-hydrogen main line;
60-a hydrogen storage tank; 70-a gas-liquid separation tank;
701-gas phase outlet; 80-finished product tank;
90-a desulfurizing tower; 901-desulfurizer spray mouth;
902-desulfurizer recycle tank; 100-a stripping column;
1001-stripped product outlet; 110-a first separation tank;
120-a fractionation column; 130-a second separation tank;
140-a delivery pump; 150-a cooler;
160-Intelligent system.
Detailed Description
The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings and the detailed description, but those skilled in the art will understand that the following described embodiments are some, not all, of the embodiments of the present invention, and are only used for illustrating the present invention, and should not be construed as limiting the scope of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In order to more clearly illustrate the technical solution of the present invention, the following description is made in the form of specific embodiments.
Examples
Referring to fig. 1, the intelligent micro-interface reaction system for diesel hydrogenation according to the embodiment of the present invention includes a hydrogenation reactor 10, a product outlet 105 is disposed on a side wall of the hydrogenation reactor 10, the product outlet 105 is connected to a hydrofining reactor 20 for performing a deep hydrogenation reaction in the hydrofining reactor 20, and a heater 30 is disposed between the hydrogenation reactor 10 and the hydrofining reactor 20 to heat a product discharged from the product outlet 105. The reaction product from the bottom of the hydrorefining reactor 20 is cooled by the heat exchanger 40 and then enters the gas-liquid separation tank 70. The bottom of the hydrogenation reactor 10 is provided with a straight-run diesel oil inlet 104, and the straight-run diesel oil inlet 104 is connected with the heat exchanger 40 through a pipeline to heat the straight-run diesel oil and then enter the hydrogenation reactor 10. The heat exchanger 40 is arranged to exchange heat between the raw diesel oil and the obtained finished diesel oil, so as to ensure that the raw diesel oil enters the hydrogenation reactor 10 for hydrogenation reaction after being heated.
A plurality of sections of fixed beds 102 are sequentially arranged in the hydrogenation reactor 10 from top to bottom, and the fixed beds 102 are filled with catalysts; the micro-interface generators 101 are arranged between the adjacent fixed beds 102, the fixed beds 102 are preferably 3 sections, the number of the micro-interface generators 101 is preferably 3, two of the micro-interface generators 101 are arranged between the two sections of the fixed beds 102, the other micro-interface generator 101 is arranged at the bottom in the hydrogenation reactor 10, basically 3 micro-interface generators 101 are needed to meet the effect of dispersion and fragmentation, the micro-interface generators 101 are provided with hydrogen inlets 103, the hydrogen inlets 103 are connected with a hydrogen main pipeline 50 after being converged, the hydrogen main pipeline 50 is connected with a hydrogen storage tank 60, and raw material hydrogen enters the hydrogen storage tank 60 and then branches to each branch pipeline through the hydrogen main pipeline 50 and then enters the micro-interface generators 101.
After the product from the hydrorefining reactor 20 passes through the gas-liquid separation tank 70 to separate the gas phase containing hydrogen sulfide and hydrogen from the product, the separated product is sent from the bottom of the gas-liquid separation tank 70 to the stripping tower 100 for purification of desulfurized diesel, the top of the stripping tower 100 is provided with a first separation tank 110 for separating sulfur-containing oil gas and low-grade oil, and the liquid phase in the first separation tank 110 is recycled to the stripping tower 100 for further purification treatment. The oil phase and the gas phase of the low fraction in the oil product after the stripping treatment are separated.
The bottom of the stripping tower is provided with a stripping product outlet 1001, the stripping product outlet 1001 is connected with the fractionating tower 120 for purification and separation of the desulfurized diesel oil, the top of the fractionating tower 120 is provided with a second separation tank 130 for separating naphtha and part of sulfur-containing oil gas, the liquid phase in the second separation tank 130 is circulated back to the fractionating tower for further purification treatment, the bottom of the fractionating tower 120 is provided with a product outlet, the product outlet is transported to the finished product tank 80 through a delivery pump 140, the finished product is desulfurized diesel oil, and the desulfurized diesel oil has purer components after a series of stripping and fractionation treatment, so that the desulfurized diesel oil can be further purified later to improve the quality of the desulfurized diesel oil.
In order to reduce the energy consumption of the fractionating tower, a cooler 150 for cooling the oil product is arranged between the finished product tank 80 and the transfer pump 140.
The top of the gas-liquid separation tank 70 is provided with a gas phase outlet 701, the gas phase containing hydrogen and hydrogen sulfide from the gas phase outlet 701 goes to the desulfurizing tower 90 to realize absorption of hydrogen sulfide in the gas phase, the top in the desulfurizing tower 90 is provided with a desulfurizing agent spraying opening 901, a plurality of layers of fillers are distributed in the desulfurizing tower 90 to increase the mass transfer effect, and the fillers are generally 2 layers and uniformly distributed in the desulfurizing tower 90.
The intelligent system 160 includes a data acquisition module, a comparison module and an intelligent adjustment module, the data acquisition module sends the acquired micro-interface reaction system operating parameters to the comparison module, the comparison module sends the set parameters to the intelligent adjustment module after analyzing the data to adjust the operating parameters of the micro-interface reaction system, wherein the intelligent adjustment module includes a hydrogenation reactor pressure control unit, a hydrofining reactor pressure control unit and a desulfurization tower temperature control unit, the intelligent system is electrically connected with the hydrogenation reactor 10, the hydrofining reactor 20 and the desulfurization tower 90 of the embodiment to achieve the purpose of controlling the pressure and the temperature thereof, and the intelligent control and adjustment can also perform detection and feedback on the flow of the material.
In the above embodiment, the micro-interface generator 101 is not limited to include 3 micro-interface generators 101, in order to increase the dispersion and mass transfer effects, an additional micro-interface generator 101 may be additionally provided, the installation position is not limited in nature, and the micro-interface generator may be external or internal, and when the micro-interface generator is internally installed, the micro-interface generator may be installed on the side wall inside the kettle in a manner of being arranged oppositely, so as to realize the opposite flushing of the micro-bubbles coming out from the outlet of the micro-interface generator 101, and of course, the most preferable for the scheme of the present invention is to use the mode of internally installing the micro-interface.
In the above embodiment, the type of the hydrogenation reactor 10 may be a fixed bed reactor, a fluidized bed reactor, or other types, and the feeding and discharging manner is not limited, and the feeding and discharging manner may be from the lower side and the upper side, or the feeding and the lower side, but the side feeding and the upper side discharging manner are more preferable.
In the above embodiment, the number of the pump bodies is not specifically required, and the pump bodies may be arranged at corresponding positions as required.
The working process and principle of the intelligent micro-interface reaction system for diesel hydrogenation of the invention are briefly explained as follows:
nitrogen purges each equipment in the intelligent micro-interface reaction system, then the operation is carried out by driving, hydrogen and straight-run diesel oil are firstly subjected to hydrogenation reaction in the hydrogenation reactor 10, before the hydrogenation reaction, the hydrogen is introduced into the micro-interface generator 101 positioned in the hydrogenation reactor 10, and the gas forms micro bubbles after being dispersed and crushed, so that the reaction can be carried out efficiently, and after the hydrogenation reaction, the reaction product is sent into the hydrofining reactor 20 through a pipeline to be subjected to deep hydrogenation reaction.
Preferably, the pressure of the hydrogenation reaction is 2-8MPa, and the temperature of the hydrogenation reaction is 250-320 ℃. Most preferably, the pressure of the hydrogenation reaction is 3.5MPa and the temperature of the hydrogenation reaction is 300 ℃.
Preferably, the pressure of the refining hydrogenation reaction is 2-8MPa, and the temperature of the refining hydrogenation reaction is 250-320 ℃. Most preferably, the pressure of the purification hydrogenation reaction is 3.5MPa and the temperature of the purification hydrogenation reaction is 300 ℃.
The catalyst used for both the hydrogenation reaction and the refining hydrogenation reaction is a Mo-Ni type catalyst, and the volume ratio of the catalyst used in the hydrogenation reactor 10 to the catalyst used in the hydrofining reactor 20 can be (1:12) - (1:15), preferably 1: 13.
After the material from the refined hydrogenation reactor 10 is separated by the gas-liquid separation tank 70, the top gas phase is sent to the desulfurization tank for desulfurization treatment, and the product separated from the bottom is sent to the stripping tower 100 for stripping, then sent to the fractionating tower 120 for separation treatment, and finally stored in the finished product tank 80, and is pure desulfurized diesel oil.
The above steps are repeated circularly to make the whole synthesis system run smoothly.
By adopting the hydrogenation reaction process, the removal rate of desulfurization can reach 99.95%, and compared with the prior hydrogenation reaction process, the removal rate is improved by nearly 1 percent.
In addition, the pressure and the temperature of the hydrogenation reaction kettle are reduced by laying the micro-interface generator 101, and the energy consumption is fully reduced.
In a word, compared with the intelligent micro-interface reaction system for diesel hydrogenation in the prior art, the intelligent micro-interface reaction system for diesel hydrogenation has the advantages of fewer equipment components, small occupied area, low energy consumption, low cost, high safety, controllable reaction and high raw material conversion rate, is equivalent to providing an intelligent micro-interface reaction system with stronger operability for the field of diesel hydrogenation, and is worthy of wide popularization and application.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. An intelligent micro-interface reaction system for diesel hydrogenation is characterized by comprising: the hydrogenation reactor is internally provided with a plurality of sections of fixed bed layers from top to bottom in sequence, and the fixed bed layers are filled with catalysts; a micro-interface generator is arranged between the adjacent fixed bed layers, and a hydrogen inlet is formed in the micro-interface generator;
a product outlet is formed in the side wall of the hydrogenation reactor, and the product outlet is connected with the hydrofining reactor to carry out deep hydrogenation reaction;
introducing a reaction product from the bottom of the hydrofining reactor into a gas-liquid separation tank to separate a gas phase containing hydrogen sulfide and hydrogen, and then sending the desulfurized diesel oil to a stripping tower from the bottom of the gas-liquid separation tank for purification of the desulfurized diesel oil, wherein the top of the stripping tower is provided with a first separation tank for separating sulfur-containing oil gas and low-grade oil, and a liquid phase in the first separation tank is circulated back to the stripping tower for further purification treatment;
the intelligent system comprises a data acquisition module, a comparison module and an intelligent regulation module, wherein the data acquisition module sends acquired specific system operation parameters to the comparison module, and the comparison module compares the data and sends the parameters adjusted after comparison to the intelligent regulation module so as to regulate the operation parameters of the micro-interface reaction system;
preferably, the intelligent regulation module comprises a hydrogenation reactor pressure control unit, a hydrofining reactor pressure control unit and a desulfurizing tower temperature control unit.
2. The intelligent micro-interface reaction system of claim 1, wherein the bottom of the stripping tower is provided with a stripped product outlet, and the stripped product outlet is connected with a fractionating tower for purification and separation of desulfurized diesel.
3. The intelligent micro-interface reaction system of claim 2, wherein a second separation tank is arranged at the top of the fractionating tower for separating naphtha and part of sulfur-containing oil gas, and the liquid phase in the second separation tank is recycled to the fractionating tower for further purification treatment.
4. The intelligent micro-interface reaction system of claim 3, wherein the bottom of the fractionating tower is provided with a product outlet, and the product outlet is transported to a finished product tank by a transfer pump.
5. The intelligent micro-interface reaction system of claim 4, wherein a cooler is disposed between the transfer pump and the product tank.
6. The intelligent micro-interface reaction system according to claim 1, wherein a gas phase outlet is arranged at the top of the gas-liquid separation tank, and the gas phase outlet is connected with a desulfurizing tower to absorb hydrogen sulfide in a gas phase;
the top in the desulfurizing tower is provided with a desulfurizing agent spraying opening, and multilayer fillers are distributed in the desulfurizing tower to increase the mass transfer effect.
7. The intelligent micro-interface reaction system of claim 6, wherein a desulfurizer circulation tank is arranged beside the desulfurization tower, the desulfurizer circulation tank is connected with the lower part of the side wall of the desulfurization tower through a pipeline, and the top of the desulfurizer circulation tank is connected with the desulfurizer spray opening through a pipeline.
8. The intelligent micro-interface reaction system according to claim 1, wherein the fixed bed is 3 sections, and the number of the micro-interface generators is 3, two of the micro-interface generators are arranged between the two fixed beds, and the other micro-interface generator is arranged at the bottom in the hydrogenation reactor.
9. The reaction method adopting the intelligent diesel hydrogenation micro-interface reaction system as set forth in any one of claims 1-8, which is characterized by comprising the following steps:
dispersing and crushing a mixed micro interface of straight-run diesel oil and hydrogen, performing hydrogenation reaction, refining and hydrogenating, and sequentially performing gas-liquid separation, steam stripping and fractionation;
in the operation process of the reaction system, the data acquisition module sends the acquired operation parameters of the reaction system to the comparison module, and the comparison module sends the set parameters to the intelligent adjustment module after analyzing the data so as to adjust the operation parameters of the reaction system.
10. The reaction process as claimed in claim 9, wherein the pressure of the hydrogenation reaction is 2-8MPa, and the temperature of the hydrogenation reaction is 250-320 ℃;
preferably, the pressure of the refining hydrogenation reaction is 2-8MPa, and the temperature of the refining hydrogenation reaction is 250-320 ℃.
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