CN108434770B - Device for removing volatile components - Google Patents
Device for removing volatile components Download PDFInfo
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- CN108434770B CN108434770B CN201810424141.4A CN201810424141A CN108434770B CN 108434770 B CN108434770 B CN 108434770B CN 201810424141 A CN201810424141 A CN 201810424141A CN 108434770 B CN108434770 B CN 108434770B
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- distribution surface
- film distribution
- evaporation unit
- liquid distributor
- fan
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- 238000001704 evaporation Methods 0.000 claims abstract description 88
- 230000008020 evaporation Effects 0.000 claims abstract description 88
- 239000007788 liquid Substances 0.000 claims abstract description 69
- 239000004744 fabric Substances 0.000 claims abstract description 27
- 239000012528 membrane Substances 0.000 claims abstract description 24
- 238000007789 sealing Methods 0.000 claims abstract description 23
- 238000007599 discharging Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 abstract 1
- 230000002349 favourable effect Effects 0.000 abstract 1
- 239000010408 film Substances 0.000 description 71
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 21
- 239000003225 biodiesel Substances 0.000 description 19
- 239000000463 material Substances 0.000 description 11
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 10
- 239000000126 substance Substances 0.000 description 9
- 238000010438 heat treatment Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 6
- 150000002148 esters Chemical class 0.000 description 5
- 239000007789 gas Substances 0.000 description 4
- 239000010775 animal oil Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 235000015112 vegetable and seed oil Nutrition 0.000 description 3
- 239000008158 vegetable oil Substances 0.000 description 3
- 239000002028 Biomass Substances 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004821 distillation Methods 0.000 description 2
- 239000011552 falling film Substances 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 239000011344 liquid material Substances 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000005809 transesterification reaction Methods 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000010485 coping Effects 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- -1 fatty acid ester Chemical class 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/26—Multiple-effect evaporating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/30—Accessories for evaporators ; Constructional details thereof
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L1/00—Liquid carbonaceous fuels
- C10L1/02—Liquid carbonaceous fuels essentially based on components consisting of carbon, hydrogen, and oxygen only
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11C—FATTY ACIDS FROM FATS, OILS OR WAXES; CANDLES; FATS, OILS OR FATTY ACIDS BY CHEMICAL MODIFICATION OF FATS, OILS, OR FATTY ACIDS OBTAINED THEREFROM
- C11C3/00—Fats, oils, or fatty acids by chemical modification of fats, oils, or fatty acids obtained therefrom
- C11C3/04—Fats, oils, or fatty acids by chemical modification of fats, oils, or fatty acids obtained therefrom by esterification of fats or fatty oils
- C11C3/10—Ester interchange
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention relates to a device for removing volatile components, which comprises a cylindrical tank body, wherein an upper sealing head and a lower sealing head are respectively arranged above and below the tank body; the utility model discloses a novel efficient energy-saving evaporator, including upper end enclosure central point, main outlet duct, first evaporation unit is connected to the inboard of upper end enclosure central point, main outlet duct cup joints the inboard of inlet duct, the one end that main outlet duct stretches into the jar body is connected first evaporation unit, the below of first evaporation unit sets up the second evaporation unit for from last to the contained angle of the cloth membrane face on each level evaporation unit down and horizontal plane increase gradually, with the surface renewal speed of maintaining the liquid on the cloth membrane face, through setting up the vacuum pressure drop in each evaporation unit's inside compensation jar body, is favorable to the discharge of volatile matter, sets up full sawtooth weir cloth membrane system in order to obtain better cloth membrane effect.
Description
Technical Field
The invention relates to equipment for removing volatile substances, in particular to a device for removing volatile components in biodiesel.
Background
The biodiesel is used as a substitute of traditional petroleum diesel, and is a fatty acid ester generated by taking renewable biomass resource animal and vegetable oil as a raw material and enabling the renewable biomass resource animal and vegetable oil to react with monohydric alcohol, mainly methanol or ethanol. On one hand, since the raw materials of the biodiesel are derived from renewable resources, the biodiesel has renewable properties, has important significance for coping with future petroleum resource shortage crisis, and on the other hand, sulfur is hardly present in the preparation process of the biodiesel, so the use of the biodiesel is beneficial to reducing the emission of harmful gases.
At present, the main biodiesel preparation process is a transesterification method, and in the reaction process, the dosage of the monohydric alcohol is excessive in order to promote the reaction of animal and vegetable oils, and is generally 10-20 times (molar ratio) of the dosage of the monohydric alcohol according to different catalysts and specific conditions of the process. Thus, after the reaction is completed, the biodiesel crude ester prepared still contains more monohydric alcohol through preliminary methanol supporting experiments. Thus, there is a need for removal of low boiling monohydric alcohols from the biodiesel crude esters described above.
CN103509583a discloses a method for refining biodiesel, in which the produced biodiesel crude ester is sent to an alcohol recovery column for distillation to remove monohydric alcohol. The method is a common method for removing monohydric alcohol in the field of biodiesel preparation, the monohydric alcohol is distilled off through a distillation tower, the operation is performed by using normal pressure tower equipment, and the temperature of the bottom liquid is 150 ℃. Therefore, a large amount of energy is required in the dealcoholization operation.
CN105861150a discloses a biodiesel circulating thin film dealcoholization device, which guides biodiesel crude ester to the tower wall through a conical liquid distributor for falling film evaporation, and enhances dealcoholization efficiency by enlarging the liquid distribution area of the device. The disadvantage of this process is that, although a large liquid distribution area is obtained by falling film, the residence time of the material in the column is considerably shortened compared to conventional packed or tray evaporation columns, which is very disadvantageous for the removal of methanol.
CN105879415a discloses a multi-fold evaporator, by arranging staggered multi-fold conical surfaces in the tower body, the liquid is enabled to go through a plurality of conical evaporation surfaces from top to bottom, i.e. the enlarged evaporation area increases the residence time of the liquid to be evaporated. But in the process of use, there are the following disadvantages: in the process that the liquid to be evaporated enters the tank body to be subjected to baffled evaporation from top to bottom, the low boiling point substances are gradually removed, and the overall viscosity of the material is increased, so that the thin layer of the liquid to be evaporated is gradually increased in thickness along with the time of the evaporation surface positioned at the lower part of the tank body, and is unfavorable for devolatilization substances, on the other hand, the material positioned at the evaporation surface positioned at the lower part of the tank body is more difficult to devolatilize due to the reduction of the proportion of volatile substances contained in the material, and is also unfavorable for supporting the volatile substances; in addition, the vacuum level from top to bottom is reduced for the entire can, which is disadvantageous for devolatilization of materials located on the lower evaporation cone of the can. In addition, because the lower conical surface in the device is connected with the inner wall of the cylinder, the corresponding gas lift pipe is arranged on the evaporation surface to remove gas, so that the low-boiling-point substances evaporated from the liquid can be removed through a longer path, the vacuum degree of the tank is reduced, and on the other hand, the gas lift pipe arranged on the evaporation surface prevents the liquid on the evaporation surface from flowing, so that the thickness of the liquid on the evaporation surface is increased, the heat transfer efficiency of the heating element below the evaporation surface is reduced, and the evaporation of the low-boiling-point substances in the liquid is not facilitated.
Disclosure of Invention
The invention aims to provide a device for removing volatile components, which can be used for dealcoholizing biodiesel crude ester generated by transesterification, and at least one of the technical problems existing in the prior art is overcome, and higher dealcoholizing efficiency is achieved on the basis of reducing energy consumption.
The invention provides a device for removing volatile components, which comprises a cylindrical tank body, wherein an upper sealing head and a lower sealing head are respectively arranged above and below the tank body; the upper end enclosure central point puts and sets up the inlet pipe, the inboard of inlet pipe cup joints the outlet duct, the outlet duct stretches into the one end of jar body and connects first evaporation unit, the below of first evaporation unit sets up the second evaporation unit.
The first evaporation unit comprises a first upper liquid distributor, a first upper film distribution surface, a first middle liquid distributor and a first lower film distribution surface; the first upper liquid distributor comprises a conical body and a distribution cylinder, wherein an opening at the upper end of the conical body is smaller than an opening at the lower end of the conical body, the opening at the upper end of the conical body is in sealing connection with the lower end of the air outlet pipe, a plurality of convex grooves are formed in the edge of the lower end of the conical body at intervals, the distribution cylinder is a cylindrical cylinder, the lower end of the distribution cylinder is in sealing connection with the opening at the lower end of the conical body, and the upper end of the distribution cylinder is a saw-tooth weir; the first upper film distribution surface is a cone, the upper end opening of the cone is smaller than the lower end opening, and the upper end opening of the cone is connected with the lower end of the distribution cylinder of the first upper liquid distributor; the first middle liquid distributor comprises an outer cylinder body, an inner cylinder body and an annular bottom plate, the outer cylinder body is in sealing connection with the outer side end of the annular bottom plate, the inner cylinder body is in sealing connection with the inner side end of the annular bottom plate, the upper end of the outer cylinder body is higher than the upper end of the inner cylinder body, the upper end of the inner cylinder body is provided with a saw-tooth weir, and the first middle liquid distributor is arranged below the first upper film distribution surface; the first lower membrane distributing surface is a conical body, the upper end opening of the conical body is larger than the lower end opening, and the upper end opening of the conical body is connected with the lower end of the inner cylinder body of the first middle liquid distributor.
The second evaporation unit comprises a second upper liquid distributor, a second upper film distribution surface, a second middle liquid distributor and a second lower film distribution surface; the second upper liquid distributor comprises an outer cylinder body, a conical body and an inner cylinder body, wherein an opening at the upper end of the conical body is smaller than an opening at the lower end of the conical body, a plurality of convex grooves are formed in the edge of the lower end of the conical body at intervals, the outer cylinder body is connected with the lower end of the conical body, the inner cylinder body is connected with the upper end of the conical body, the upper end level of the inner cylinder body is higher than that of the outer cylinder body, and the upper end of the outer cylinder body is provided with a sawtooth weir; the structure of the second upper cloth membrane surface is the same as that of the first upper cloth membrane surface, the second middle liquid distributor is the same as that of the first middle liquid distributor, the second lower cloth membrane surface is the same as that of the first lower cloth membrane surface, and the second upper cloth membrane surface is connected with the lower end of the outer barrel of the second upper liquid distributor.
The included angles of the first upper film distribution surface, the first lower film distribution surface, the second upper film distribution surface, the second lower film distribution surface and the horizontal plane are sequentially increased.
A first fan is arranged between a first upper film distribution surface and a first lower film distribution surface of the first evaporation unit, and a second fan is arranged between a second upper film distribution surface and a second lower film distribution surface of the second evaporation unit; the fan control unit is electrically connected with the first fan and the second fan.
Further, a third evaporation unit is sequentially arranged below the second evaporation unit in the tank body, the third evaporation unit comprises a third upper liquid distributor, a third upper film distribution surface, a third middle liquid distributor and a third lower film distribution surface, the third upper liquid distributor and the third upper film distribution surface are identical in structure with corresponding parts in the second evaporation unit; the included angles between the third upper film distribution surface and the horizontal plane and between the third lower film distribution surface and the horizontal plane are sequentially increased; and a third fan is arranged between the third upper film distribution surface and the third lower film distribution surface, so that the third fan is electrically connected with the fan control unit.
Further, a plurality of evaporation units with the same structure as the second evaporation unit are sequentially arranged below the third evaporation unit, the included angle between the film distribution surface and the horizontal plane in the plurality of evaporation units from top to bottom is sequentially increased, a fan is arranged between the upper film distribution surface and the lower film distribution surface of the plurality of evaporation units, and the fan is electrically connected with the fan control unit.
Further, one end of the feeding pipe extending into the cylinder body is inwards bent to form a bell mouth.
Further, the air outlet pipe is connected with the condensing device and the vacuumizing device in sequence.
Further, a discharging pipe is arranged on the lower sealing head, and a valve is arranged on the discharging pipe.
The device provided by the invention has the following technical advantages: (1) According to the invention, the included angle between the membrane distribution surface on each stage of evaporation unit from top to bottom and the horizontal plane is gradually increased, so that the defect that the flow speed on the membrane distribution surface is reduced due to the increase of the viscosity of the biodiesel with evaporation can be overcome. The liquid layer on the membrane surface is slowed down in flow speed, so that the surface renewal of the biodiesel to be evaporated is reduced, and on the other hand, the liquid layer on the membrane surface is thickened, so that evaporation is not facilitated. (2) The invention is characterized in that a fan is arranged in each evaporation unit, and the fan control unit is electrically connected with the fan, so that the vacuum pressure drop from bottom to bottom in the tank body is eliminated, and the removal of volatile substances is facilitated. (3) The invention overcomes the defect of uneven film distribution widely existing in the traditional baffling evaporator by arranging the full-sawtooth weir film distribution, and particularly the uneven film distribution in any evaporation surface in the evaporation unit can cause the subsequent film distribution to be all invalid, thereby leading to the failure of the even film distribution. Through all setting up two-stage sawtooth weir cloth membrane ware in every layer of evaporation unit in this application, can all can make on every layer of evaporation surface realize even cloth membrane, on the other hand, even there is inhomogeneous in the evaporation unit of a certain level, still accessible next grade sawtooth weir cloth membrane ware corrects. (4) According to the invention, the plurality of convex grooves are arranged at the lower end edge of the cone-shaped body of the upper film distribution surface of each stage of evaporation unit at a certain distance, when the liquid material flowing downwards along the upper film distribution surface flows to the convex grooves, the liquid material flows through the two ends of the convex grooves, so that a volatile material circulation channel is formed at the convex grooves, and thus, the volatile material at the volatile position on the upper film distribution surface can directly enter the evaporation unit through the convex grooves and then be rapidly discharged out of the tank body through the air outlet pipe, the discharge path of the volatile material is shortened, and the overall vacuum degree of the tank body is improved.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention.
FIG. 2 is a schematic structural view of the upper surface of the present invention.
Fig. 3 is a schematic structural view of the first upper liquid distributor.
Fig. 4 is a schematic illustration of a partial structure of the first middle liquid distributor of fig. 1.
FIG. 5 is a schematic diagram of the structure of the second upper liquid distributor.
Description of the embodiments
The technical scheme provided by the invention is further described below with reference to specific embodiments.
As shown in fig. 1-5, a device for removing volatile components comprises a cylindrical tank body 1, wherein an upper sealing head 2 and a lower sealing head 3 are respectively arranged above and below the tank body 1; the center of the upper seal head 2 is provided with a feed pipe 4, the inner side of the feed pipe 4 is sleeved with an air outlet pipe 5, one end of the air outlet pipe 5 extending into the tank body 1 is connected with a first evaporation unit, and a second evaporation unit is arranged below the first evaporation unit; the first evaporation unit comprises a first upper liquid distributor 6, a first upper film distribution surface 7, a first middle liquid distributor 8 and a first lower film distribution surface 9; the first upper liquid distributor 6 comprises a conical body and a distribution cylinder, the upper end opening of the conical body is smaller than the lower end opening, the upper end opening is in sealing connection with the lower end of the air outlet pipe 5, a plurality of convex grooves 10 are formed in the edge of the lower end of the conical body at intervals, the distribution cylinder is a cylindrical cylinder, the lower end of the distribution cylinder is in sealing connection with the lower end opening of the conical body, and the upper end of the distribution cylinder is a saw-tooth weir; the first upper film distribution surface 7 is a cone, the upper end opening of the cone is smaller than the lower end opening, and the upper end opening of the cone is connected with the lower end of the distribution cylinder of the first upper liquid distributor 6; the first middle liquid distributor 8 comprises an outer cylinder, an inner cylinder and an annular bottom plate, the outer cylinder is in sealing connection with the outer side end of the annular bottom plate, the inner cylinder is in sealing connection with the inner side end of the annular bottom plate, the upper end of the outer cylinder is higher than the upper end of the inner cylinder, the upper end of the inner cylinder is provided with a saw-tooth weir, and the first middle liquid distributor 8 is arranged below the first upper film distribution surface; the first lower membrane distributing surface 9 is a cone, the upper end opening of the cone is larger than the lower end opening, and the upper end opening of the cone is connected with the lower end of the inner cylinder of the first middle liquid distributor 8; the second evaporation unit comprises a second upper liquid distributor 11, a second upper film distribution surface 12, a second middle liquid distributor 13 and a second lower film distribution surface 14; the second upper liquid distributor 11 comprises an outer cylinder, a conical body and an inner cylinder, wherein the upper end opening of the conical body is smaller than the lower end opening, a plurality of convex grooves 10 are formed in the edge of the lower end of the conical body at intervals, the outer cylinder is connected with the lower end of the conical body, the inner cylinder is connected with the upper end of the conical body, the upper end level of the inner cylinder is higher than the upper end level of the outer cylinder, and the upper end of the outer cylinder is provided with a sawtooth weir; the structure of the second upper film distribution surface 12 is the same as that of the first upper film distribution surface 7, the second middle liquid distributor 13 is the same as that of the first middle liquid distributor 8, the second lower film distribution surface 14 is the same as that of the first lower film distribution surface 9, and the second upper film distribution surface 12 is connected with the lower end of the outer cylinder of the second upper liquid distributor; the included angles of the first upper cloth film surface 7, the first lower cloth film surface 9, the second upper cloth film surface 12, the second lower cloth film surface 14 and the horizontal plane are sequentially increased; a first fan 15 is arranged between the first upper film distribution surface 7 and the first lower film distribution surface 9 of the first evaporation unit, and a second fan 16 is arranged between the second upper film distribution surface 12 and the second lower film distribution surface 14 of the second evaporation unit; a fan control unit is arranged in electrical connection with the first fan 15 and the second fan 16.
In a further embodiment, the first and second evaporation units have an included angle of 25 °,28 °,32 ° and 36 ° from the horizontal from the lower to the lower first upper cloth surface to the second lower cloth surface, and the first and second fans and seals in the first and second evaporation units are rotated at 125rpm and 175rpm, respectively, and preheated such that a feed with a methanol content of 15wt% is maintained at 50 ℃ and such that the heating elements under each cloth surface from top to bottom are maintained at 55 ℃. In the comparative example, the included angle of each cloth film surface to the horizontal plane was 25 °, and no fan was provided in the evaporation unit, and the heating element under each cloth film surface from top to bottom was kept at 55 ℃, which was the same as the structure of the present example. It was found through experiments that the working efficiency of this example was improved by 31% relative to the comparative example, and the methanol content in the final product was 1.2wt% which was lower than that in the comparative example by 3.3 wt%.
In a further embodiment, a third evaporation unit is sequentially disposed below the second evaporation unit in the tank 1, where the third evaporation unit includes a third upper liquid distributor 17, a third upper film distributing surface 18, a third middle liquid distributor 19 and a third lower film distributing surface 20, the third upper liquid distributor 17, the third upper film distributing surface 18, and the third middle liquid distributor 19 and the third lower film distributing surface 20 have the same structure as corresponding components in the second evaporation unit; the included angles between the third upper cloth film surface 18 and the third lower cloth film surface 20 and the horizontal plane are sequentially increased; a third fan 21 is disposed between the third upper film distribution surface 18 and the third lower film distribution surface 20, so that the third fan 21 is electrically connected with the fan control unit.
In a further embodiment, a plurality of evaporation units with the same structure as the second evaporation unit are sequentially arranged below the third evaporation unit, the included angle between the film distribution surface and the horizontal plane in the plurality of evaporation units from top to bottom is sequentially increased, a fan is arranged between the upper film distribution surface and the lower film distribution surface of the plurality of evaporation units, and the fan is electrically connected with the fan control unit.
In a further embodiment, the end of the feed pipe 4 extending into the cylinder is bent inwards to form a bell mouth.
In a further embodiment, the air outlet pipe 5 is connected with a condensing device and a vacuum pumping device in sequence.
In a further embodiment, a discharging pipe is arranged on the lower sealing head 3, and a valve is arranged on the discharging pipe.
In a further embodiment, the lower surfaces of the upper and lower cloth film surfaces are provided with heating elements respectively connected to a temperature control device, so that the temperature of each heating element increases gradually from top to bottom. Specifically, when only the first and second evaporation units were provided, the angles between the lower to lower first upper film distribution surfaces and the second lower film distribution surfaces in the first and second evaporation units were 25 °,28 °,32 ° and 36 °, and the first fans and the second sealers in the first and second evaporation units were rotated at 125rpm and 175rpm, respectively, and preheated so that the methanol content of 15wt% was maintained at 50 ℃, and so that the heating elements under the respective upper to lower film distribution surfaces were maintained at 55 ℃,58 ℃,64 ℃ and 70 ℃, respectively. In the comparative example, the included angle of each cloth film surface to the horizontal plane was 25 °, and no fan was provided in the evaporation unit, and the heating element under each cloth film surface from top to bottom was kept at 55 ℃, which was the same as the structure of the present example. It was found through experiments that the working efficiency of this example was improved by 33% relative to the comparative example, and the methanol content in the final product was 0.6wt% which was lower than that in the comparative example by 3.3 wt%. Along with the removal of volatile substances in the materials, the viscosity of the materials is gradually increased, so that the flow velocity of the materials on the film distribution surface is slowed down. The liquid layer flow velocity on the membrane surface slows down on the one hand so that the surface renewal of the biodiesel to be evaporated is reduced, on the other hand, the liquid layer on the membrane surface is thickened, the heat transfer efficiency of the heating element below the membrane surface is low, and the evaporation is not facilitated. In the embodiment, the included angle between the membrane distribution surface and the horizontal plane on each stage of evaporation units from top to bottom is gradually increased, so that the technical defect caused by the slow flow speed on the membrane distribution surface due to the increase of the viscosity of the evaporated biodiesel can be overcome.
The above embodiments are used for illustrating the technical solution of the present invention, and are not to be construed as limiting the present invention.
Claims (6)
1. The device for removing volatile components comprises a cylindrical tank body, wherein an upper sealing head and a lower sealing head are respectively arranged above and below the tank body; the center of the upper seal head is provided with a feed pipe, the inner side of the feed pipe is sleeved with an air outlet pipe, one end of the air outlet pipe extending into the tank body is connected with a first evaporation unit, and a second evaporation unit is arranged below the first evaporation unit;
the first evaporation unit comprises a first upper liquid distributor, a first upper film distribution surface, a first middle liquid distributor and a first lower film distribution surface; the first upper liquid distributor comprises a conical body and a distribution cylinder, wherein an opening at the upper end of the conical body is smaller than an opening at the lower end of the conical body, the opening at the upper end of the conical body is in sealing connection with the lower end of the air outlet pipe, a plurality of convex grooves are formed in the edge of the lower end of the conical body at intervals, the distribution cylinder is a cylindrical cylinder, the lower end of the distribution cylinder is in sealing connection with the opening at the lower end of the conical body, and the upper end of the distribution cylinder is a saw-tooth weir; the first upper film distribution surface is a cone, the upper end opening of the cone is smaller than the lower end opening, and the upper end opening of the cone is connected with the lower end of the distribution cylinder of the first upper liquid distributor; the first middle liquid distributor comprises an outer cylinder body, an inner cylinder body and an annular bottom plate, the outer cylinder body is in sealing connection with the outer side end of the annular bottom plate, the inner cylinder body is in sealing connection with the inner side end of the annular bottom plate, the upper end of the outer cylinder body is higher than the upper end of the inner cylinder body, the upper end of the inner cylinder body is provided with a saw-tooth weir, and the first middle liquid distributor is arranged below the first upper film distribution surface; the first lower cloth membrane surface is a cone, the upper end opening of the cone is larger than the lower end opening, and the upper end opening of the cone is connected with the lower end of the inner cylinder of the first middle liquid distributor;
the second evaporation unit comprises a second upper liquid distributor, a second upper film distribution surface, a second middle liquid distributor and a second lower film distribution surface; the second upper liquid distributor comprises an outer cylinder body, a conical body and an inner cylinder body, wherein an opening at the upper end of the conical body is smaller than an opening at the lower end of the conical body, a plurality of convex grooves are formed in the edge of the lower end of the conical body at intervals, the outer cylinder body is connected with the lower end of the conical body, the inner cylinder body is connected with the upper end of the conical body, the upper end level of the inner cylinder body is higher than that of the outer cylinder body, and the upper end of the outer cylinder body is provided with a sawtooth weir; the structure of the second upper film distribution surface is the same as that of the first upper film distribution surface, the second middle liquid distributor is the same as that of the first middle liquid distributor, the second lower film distribution surface is the same as that of the first lower film distribution surface, and the second upper film distribution surface is connected with the lower end of the outer barrel of the second upper liquid distributor;
the included angles of the first upper film distribution surface, the first lower film distribution surface, the second upper film distribution surface, the second lower film distribution surface and the horizontal plane are sequentially increased;
a first fan is arranged between a first upper film distribution surface and a first lower film distribution surface of the first evaporation unit, and a second fan is arranged between a second upper film distribution surface and a second lower film distribution surface of the second evaporation unit; the fan control unit is electrically connected with the first fan and the second fan.
2. A device for removing volatile components according to claim 1, wherein: a third evaporation unit is sequentially arranged below the second evaporation unit in the tank body, the third evaporation unit comprises a third upper liquid distributor, a third upper film distribution surface, a third middle liquid distributor and a third lower film distribution surface, the third upper liquid distributor and the third upper film distribution surface are identical in structure with corresponding parts in the second evaporation unit; the included angles between the third upper film distribution surface and the horizontal plane and between the third lower film distribution surface and the horizontal plane are sequentially increased; and a third fan is arranged between the third upper film distribution surface and the third lower film distribution surface, so that the third fan is electrically connected with the fan control unit.
3. A device for removing volatile components according to claim 2, wherein: the lower part of the third evaporation unit is sequentially provided with a plurality of evaporation units with the same structure as the second evaporation unit, the included angle between the film distribution surface and the horizontal plane in the plurality of evaporation units from top to bottom is sequentially increased, a fan is arranged between the upper film distribution surface and the lower film distribution surface of the plurality of evaporation units, and the fan is electrically connected with a fan control unit.
4. A device for removing volatile components according to claim 1, wherein: one end of the feed pipe extending into the cylinder body is inwards bent to form a bell mouth.
5. A device for removing volatile components according to claim 1, wherein: the air outlet pipe is connected with the condensing device and the vacuumizing device in sequence.
6. A device for removing volatile components according to claim 1, wherein: and a discharging pipe is arranged on the lower sealing head, and a valve is arranged on the discharging pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810424141.4A CN108434770B (en) | 2018-05-07 | 2018-05-07 | Device for removing volatile components |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810424141.4A CN108434770B (en) | 2018-05-07 | 2018-05-07 | Device for removing volatile components |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108434770A CN108434770A (en) | 2018-08-24 |
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