CN113559531B - Vaporization device and method suitable for high boiling point substance in low superheat degree environment - Google Patents
Vaporization device and method suitable for high boiling point substance in low superheat degree environment Download PDFInfo
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- CN113559531B CN113559531B CN202010350723.XA CN202010350723A CN113559531B CN 113559531 B CN113559531 B CN 113559531B CN 202010350723 A CN202010350723 A CN 202010350723A CN 113559531 B CN113559531 B CN 113559531B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/16—Evaporating by spraying
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/0011—Heating features
- B01D1/0041—Use of fluids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/14—Evaporating with heated gases or vapours or liquids in contact with the liquid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/16—Evaporating by spraying
- B01D1/20—Sprayers
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- 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
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Abstract
The invention relates to a vaporizing device and a method suitable for high boiling point substances in a low superheat environment, wherein the vaporizing device comprises a vaporizer shell, a feed spraying mechanism and a gas distributor, wherein a vaporized material outlet and a hot gas inlet are respectively arranged at the top end and the bottom end of the vaporizer shell, the gas distributor is connected with the hot gas inlet and is used for introducing hot gas entering from the hot gas inlet into the vaporizer shell in a cyclone mode, and the feed spraying mechanism stretches into the vaporizer shell at a position above the gas distributor. Compared with the prior art, the method is particularly suitable for the process for preparing ethylene glycol and co-producing methanol by the gas-solid phase catalytic hydrogenation reaction of ethylene carbonate, can effectively avoid the coking problem of ethylene carbonate in the vaporization process, has high vaporization efficiency, and is also suitable for the rapid vaporization process of other high-boiling-point liquids in the environment with low superheat degree.
Description
Technical Field
The invention belongs to the technical field of vaporization of high-boiling-point substances, and relates to a vaporization device suitable for the high-boiling-point substances in a low-superheat-degree environment.
Background
Methanol and ethylene glycol are two important products of carbon-to-chemistry utilization. Among them, methanol is called "methanol economy", which plays an important role in energy and chemical industry, and can be used as organic chemical raw material, liquid fuel, hydrogen storage carrier and good solvent. The ethylene glycol is used as a basic chemical raw material, and can be used for producing polyester resin, alkyd resin and polyester fiber, and can also be used in the fields of adhesives, plasticizers, paint, explosive, nonionic surfactants and the like. At present, the greenhouse effect and environmental damage caused by carbon dioxide are increasingly increased, and chemical conversion is performed to synthesize chemicals such as methanol, ethylene glycol and the like by utilizing carbon dioxide resources, so that the method has important significance for energy, environment and economy.
Because of the characteristics of good thermodynamic stability, kinetic inertia and the like of carbon dioxide molecules, the direct hydroconversion route of carbon dioxide has the problems of high reaction condition requirement, low catalyst activity and the like. At present, the process of producing ethylene carbonate from carbon dioxide and ethylene oxide has been industrially realized, and the reaction has high reactivity and selectivity. Therefore, the carbon dioxide is used as a raw material, firstly, the ethylene carbonate is prepared, and then, the ethylene carbonate and the hydrogen are reacted under mild conditions to prepare the ethylene glycol and simultaneously coproduce the methanol, so that the efficient indirect utilization of the carbon dioxide can be realized, and the method has great application potential.
At present, the research on the hydrogenation reaction of the ethylene carbonate is biased to the performance and the preparation process of the catalyst, and the research and the optimization of the hydrogenation process flow of the ethylene carbonate are hardly reported in any disclosure. In the prior data, the catalyst is evaluated by adopting a stirring kettle to intermittently operate, and a certain amount of solvent such as tetrahydrofuran, 1, 4-dioxane, cyclohexane and the like is required to be added into a reaction system. However, in industrial application, the intermittent operation efficiency is low, large-scale production is difficult to carry out, and a solvent recovery device is required to be added in a subsequent separation unit of the gas-liquid-solid three-phase hydrogenation system, so that equipment investment and energy consumption are improved. In order to solve the problems, the research on the gas-solid phase continuous catalytic hydrogenation process of the ethylene carbonate has important significance. Among them, how to realize the vaporization process of ethylene carbonate is of great importance, and unfortunately, no patent or literature has been disclosed for systematically researching the vaporization process of ethylene carbonate.
Ethylene carbonate is a heat-sensitive high-boiling-point substance, is easy to coke and polymerize at high temperature, and cannot be vaporized by adopting a direct heating mode. Therefore, there is a need to develop an effective means of vaporizing ethylene carbonate.
Disclosure of Invention
The present invention has for its object to overcome the above-mentioned drawbacks of the prior art by providing a vaporization apparatus and a method suitable for high boiling point substances in a low superheat environment.
The aim of the invention can be achieved by the following technical scheme:
according to one of the technical schemes, the invention provides a vaporization device suitable for high-boiling-point substances in a low-superheat-degree environment, which comprises a vaporizer shell, a feeding spraying mechanism and a gas distributor, wherein a vaporized material outlet and a hot gas inlet are respectively arranged at the top end and the bottom end of the vaporizer shell, the gas distributor is connected with the hot gas inlet and is used for introducing hot gas entering from the hot gas inlet into the vaporizer shell in a cyclone mode, and the feeding spraying mechanism stretches into the vaporizer shell at a position above the gas distributor.
Further, the gas distributor comprises a distributor main body connected with the hot gas inlet and used for uniformly distributing the hot gas, and a distributor outlet arranged on the side wall of the distributor main body, and guide vanes are vertically arranged beside the distributor outlet.
Further, the included angle between the outlet of the distributor and the guide vane is an acute angle. The size of the gas phase outlet and the angle of the guide vane can be properly adjusted according to actual needs so as to improve the gas-liquid mixing effect, strengthen the gas-liquid heat transfer and mass transfer process and ensure the fast completion of vaporization.
Further, the height of the vaporizer shell needs to meet the vaporization time requirement, and a swirl zone positioned at the lower section and a pipe flow zone positioned at the upper section are formed in the vaporizer shell. Furthermore, a baffle plate is also transversely and alternately arranged in the pipe flow area.
The swirl zone is positioned at the lowest part of the vaporizing device, hot hydrogen at the outlet of the gas distributor moves upwards in a swirl shape, fluid is mainly in the swirl motion, radial and axial motions exist at the same time, gas and liquid are mixed at the position efficiently, and a large number of small droplets of ethylene carbonate are vaporized at the position rapidly. In the axial direction, the swirling motion of the gas gradually decays and enters the tube flow region. The pipe flow area is mainly axially moved, and a small amount of liquid is entrained in the gas in the area to axially move, so that radial and efficient mixing of the gas and the liquid is not facilitated basically, a certain temperature difference exists from the center of the vaporizer to the side wall in the pipe flow area, and the heat of the hot gas on the side wall cannot be well transferred to the center to vaporize the small liquid drops of ethylene carbonate, so that the vaporization effect is affected. In order to ensure that the residual small amount of liquid is completely vaporized, a baffle plate can be arranged in a pipe flow area to provide radial disturbance for the axially moving gas, further enhance the gas-liquid mixing effect, strengthen the heat and mass transfer process and ensure that the raw materials are completely vaporized at the position.
Further, the vaporizer shell is also provided with a silk screen foam remover at the position of the vaporized material outlet. Can effectively prevent entrainment, can also be used as an effective means for improving the gas-liquid mixing effect and strengthening the gas-liquid heat transfer and mass transfer, and ensures that a very small amount of unvaporized raw material at an outlet is completely vaporized on the surface of the silk-screen foam remover.
Further, the feed spraying mechanism comprises a liquid feed inlet arranged on the side wall of the vaporizer shell, a connecting pipeline piece connected with the liquid feed inlet and extending into the vaporizer shell, and an atomizing nozzle arranged on the connecting pipeline piece. The droplets are preferably ejected vertically upwards. The atomizing nozzle adopts a conventional single-fluid nozzle, and after high-boiling-point substance liquid such as ethylene carbonate and the like is atomized by the nozzle, the average Sotel droplet diameter of the obtained droplets is below 150 microns, the larger surface area is provided, the heat transfer area between gas and liquid phases is greatly increased, and the rapid completion of the vaporization process is facilitated.
Further, the vaporizer shell, the feeding spraying mechanism and the gas distributor are respectively provided with one or more groups (respectively corresponding to the disposable feeding or the sectional feeding) in a one-to-one correspondence manner, when the vaporizer shell is provided with a plurality of groups, the adjacent vaporizer shells are connected in series, and at the moment, the sectional feeding of the high boiling point substances is realized. When a staged feeding mode is adopted, each stage of feeding is introduced into the vaporization device through the feeding spraying mechanism. The smaller the flow entering the nozzle, the smaller the cable mean droplet diameter of the resulting droplets atomized, the more advantageous the vaporization due to the same pressure drop. Therefore, on the same scale, vaporization is favored when a staged feed approach is employed.
Further, the high boiling point substance is ethylene carbonate, the hot gas entering from the hot gas inlet is hot hydrogen with the molar concentration of 90% -100%, wherein the molar ratio of the hot hydrogen to the ethylene carbonate is 150-300:1.
further, the operating pressure of the vaporizing device is 2-5MPa, and the feeding temperature of the hot gas is 190-240 ℃.
Furthermore, the inner diameter of the vaporizer shell needs to meet the requirement that in the whole vaporization process, fog drops of high-boiling-point substances such as ethylene carbonate and the like do not collide with the inner wall of the vaporizer shell, so that atomized small liquid drops are prevented from forming a liquid film on the inner wall of the vaporizer shell again, and the vaporization effect is prevented from being influenced.
The second technical scheme of the invention is to provide a vaporization method suitable for high boiling point substances in a low superheat environment, which is implemented by adopting the device, and in the implementation process, the high boiling point substances and hot gas are respectively introduced into a vaporizer shell through a feed spraying mechanism and a hot gas inlet, so that vaporization is completed.
Taking ethylene carbonate as an example, a high boiling point material, a large amount of hydrogen can be used to reduce the partial pressure of ethylene carbonate in the mixture to realize vaporization under low temperature condition in order to reduce vaporization temperature. According to the research of the invention, when the molar ratio of the hydrogen ester is 300 and the vaporization pressure is 4MPa, the vaporization temperature of the ethylene carbonate mixture is 175 ℃, compared with the temperature range (170-220 ℃) of hydrogenation reaction, the maximum temperature difference is not more than 45 ℃, and if the ratio of the hydrogen ester is reduced to 200, the relative temperature difference with the hydrogenation reaction is reduced to within 34 ℃. In fact, the catalytic hydrogenation of ethylene carbonate is closely related to temperature, with a relatively optimal temperature range of 180-200 ℃, and the superheat degree is further reduced under the temperature condition. From the above, the vaporization of ethylene carbonate belongs to the vaporization process under the condition of low superheat degree, and the requirement on heat transfer and mass transfer in the vaporization device is extremely high, and if the efficient mixing of gas and liquid cannot be realized, the heat transfer and mass transfer process between the gas and liquid phases is effectively enhanced, and then complete vaporization is difficult to realize. If vaporization is carried out at a temperature higher than that of hydrogenation reaction, on the one hand, ethylene carbonate can coke due to the problem of self-thermosensitive property; on the other hand, the vaporized material can enter the hydrogenation device only after the subsequent cooling, and once the ethylene carbonate gas is condensed due to the local supercooling in the cooling process, the catalyst bed layer is locally carried with liquid, so that the catalyst at the upper part of the reactor is coked, the bed layer is reduced and increased, the raw material conversion rate and the product selectivity are affected, the service life of the catalyst is reduced, and the continuous and stable long-period operation of a large-scale industrial device is not facilitated.
In order to solve the problems, the invention adopts a feeding spraying system to atomize the liquid ethylene carbonate into micron-sized small liquid drops, the atomized ethylene carbonate has larger surface area, the gas-liquid phase heat transfer area is greatly increased, and the atomized ethylene carbonate and hot hydrogen are fully contacted and vaporized in a vaporizing device. The vaporization device is internally provided with an inner member which can strengthen the internal flow field and enhance the gas-liquid mixing effect, and through axial and radial bidirectional disturbance, the gas-liquid mixing effect is effectively improved, the gas-liquid heat transfer and mass transfer process is enhanced, the vaporization efficiency is greatly improved, the ethylene carbonate is rapidly vaporized in a low superheat degree environment, the vaporized temperature is consistent with the hydrogenation reaction temperature, and the vaporized temperature can be directly sent to a catalyst bed for reaction, so that the vaporization and the reaction process are reasonably matched. The method is also suitable for the rapid vaporization process of other high boiling point substances in the environment with low superheat.
Compared with the prior art, the invention has the following advantages:
(1) The vaporization method is suitable for high boiling point substances, especially for the raw materials of ethylene carbonate, especially for the gas-solid phase catalytic hydrogenation system of ethylene carbonate, and is also suitable for the rapid vaporization process of other high boiling point substances in the environment with low superheat degree.
(2) The vaporization process conditions adopted by the invention are matched with the hydrogenation reaction conditions of the ethylene carbonate, the vaporized product can directly enter a reaction system without additional cooling, the problem that the ethylene carbonate gas is condensed to cause liquid carrying on the upper bed layer of the catalyst in the cooling process is avoided, and the coking problem of the ethylene carbonate in the vaporization process can also be effectively avoided.
(3) The invention adopts a spray vaporization mode, and atomized small liquid drops have larger surface area, so that the heat transfer area between gas and liquid phases is greatly increased, and the heat transfer process is enhanced; meanwhile, the internal flow field of the vaporizing device is enhanced by adopting the specially designed internal components, the gas-liquid mixing effect is enhanced by axial and radial bidirectional disturbance, the gas-liquid heat transfer and mass transfer process is effectively enhanced, the vaporizing efficiency is greatly improved, the vaporizing time is shortened, and the ethylene carbonate is rapidly vaporized in the environment with low superheat degree.
(4) The vaporization device has simple structure, and the vaporization method is effective and reliable, thereby providing an industrially feasible vaporization solution for the gas-solid phase hydrogenation process of the ethylene carbonate.
Drawings
FIG. 1 is a schematic diagram of one embodiment of the present invention;
FIG. 2 is a schematic diagram of a second embodiment of the present invention;
FIG. 3 is a schematic view of a third embodiment of the present invention
FIG. 4 is a schematic perspective view of a swirl gas distributor according to the present invention;
FIG. 5 is a schematic front view of a swirl gas distributor;
FIG. 6 is a schematic of a comparative example of the present invention;
FIG. 7 is a schematic view of a gas distributor in a comparative example of the present invention;
FIG. 8 is a schematic view of the flow field within the vaporization apparatus of the present invention;
the figure indicates:
the device comprises a 1-vaporizer shell, a 2-feeding spraying mechanism, a 3-hot gas inlet, a 4-vaporized material outlet, a 5-gas distributor, a 6-baffling baffle, a 7-liquid feeding port, an 8-nozzle, a 9-connecting pipeline piece and a 10-wire mesh demister.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples. The present embodiment is implemented on the premise of the technical scheme of the present invention, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present invention is not limited to the following examples.
The invention provides a vaporization device suitable for high boiling point substances in a low superheat degree environment, the structure of the vaporization device is shown in fig. 1, the vaporization device comprises a vaporizer shell 1, a feed spraying mechanism 2 and a gas distributor 5, a vaporized material outlet 4 and a hot gas inlet 3 are respectively arranged at the top end and the bottom end of the vaporizer shell 1, the gas distributor 5 is connected with the hot gas inlet 3 and is used for introducing hot gas entering from the hot gas inlet 3 into the vaporizer shell 1 in a cyclone mode, and the feed spraying mechanism 2 stretches into the vaporizer shell 1 at a position above the gas distributor 5.
In a specific embodiment of the present invention, referring again to fig. 4 and 5, the gas distributor 5 includes a distributor body connected to the hot gas inlet 3 and uniformly distributing the hot gas, and a distributor outlet 501 disposed on a sidewall of the distributor body, and a guide vane 502 is vertically disposed at a side of the distributor outlet 501. The distributor outlets 501 and the guide vanes 502 may each be provided with one or more, when provided with a plurality, the guide vanes 502 arranged beside the respective distributor outlets 501 forming a "ratchet-like" surface.
In more specific embodiments, the distributor outlets 501 are at an acute angle to the guide vanes 502. The size of the gas phase outlet and the angle of the guide vane 502 can be properly adjusted according to actual needs to improve the gas-liquid mixing effect, strengthen the gas-liquid heat transfer and mass transfer process and ensure the fast completion of vaporization.
In a specific embodiment of the present invention, as shown in fig. 8, the vaporizer housing 1 is provided with a height required for vaporization time and has a swirl zone at a lower stage and a tube flow zone at an upper stage formed therein. Furthermore, a baffle plate 6 is transversely and alternately arranged in the pipe flow area.
In a specific embodiment of the present invention, the vaporizer housing 1 is further provided with a wire mesh demister 10 at the vaporized material outlet 4. Can effectively prevent entrainment, can also be used as an effective means for improving the gas-liquid mixing effect and strengthening the gas-liquid heat transfer and mass transfer, and ensures that a very small amount of unvaporized raw material at an outlet is completely vaporized on the surface of the wire mesh demister 10.
In a specific embodiment of the present invention, the feed spraying mechanism 2 includes a liquid feed port 7 disposed at a side wall of the vaporizer housing 1, a connection pipe member 9 connected to the liquid feed port 7 and extending into the vaporizer housing 1, and an atomizing nozzle 8 provided on the connection pipe member 9. The droplets are preferably ejected vertically upwards. The atomizing nozzle 8 adopts a conventional single-fluid nozzle 8, and after high-boiling-point substance liquid such as ethylene carbonate and the like is atomized by the nozzle 8, the obtained liquid drops have the average Sotel drop diameter of less than 150 microns, have larger surface area, greatly increase the heat transfer area between gas and liquid, and are beneficial to the rapid completion of the vaporization process.
In a specific embodiment of the present invention, the vaporizer housing 1, the feeding spraying mechanism 2 and the gas distributor 5 are respectively provided with one or more groups (respectively corresponding to a disposable feeding or a staged feeding mode) in a one-to-one correspondence, when the vaporizer housing 1 is provided with a plurality of groups, the adjacent vaporizer housings 1 are connected in series, at this time, the staged feeding of the high boiling substance is realized, and when the staged feeding mode is adopted, each stage of feeding is introduced into the vaporizing device through the feeding spraying mechanism 2. The smaller the flow into the nozzle 8, the smaller the cable mean droplet diameter of the droplets obtained by atomization, the more advantageous the vaporization, due to the same pressure drop. Therefore, on the same scale, vaporization is favored when a staged feed approach is employed. The vaporizer housings 1 of each group can be arranged in the structure of fig. 1 or fig. 2.
In a specific embodiment of the present invention, the high boiling point material is ethylene carbonate, and the hot gas entering from the hot gas inlet 3 is hot hydrogen with a molar concentration of 90% -100%, wherein the molar ratio of the hot hydrogen to the ethylene carbonate is 150-300:1.
in a more specific embodiment, the vaporization unit operates at a pressure of 2-5MPa and a hot gas feed temperature of 190-240 ℃.
In a specific embodiment of the present invention, the inside diameter of the vaporizer housing 1 needs to meet that droplets of high boiling point substances such as ethylene carbonate do not collide with the inner wall of the vaporizer housing 1 in the whole vaporization process, so as to avoid droplets after atomization from forming a liquid film on the inner wall of the vaporizer housing again, and influence the vaporization effect.
The above embodiments may be implemented singly or in any combination of two or more.
The above embodiments are described in more detail below in connection with specific examples.
Example 1:
as shown in FIG. 1, the feeding temperature was 100deg.C, and the feeding amount of 125kg/h of ethylene carbonate liquid was fed into the feed spraying mechanism 2 from the liquid feed inlet 7, atomized into micro-sized droplets, and then sprayed from the nozzle 8, and fed into the vaporizing device for vaporization, and the operating pressure of the vaporizing device was 2MPa. The feed temperature was 210℃and the molar concentration was 99%, and the feed amount was 9638Nm 3 The hot hydrogen per hour enters the vaporizing device from the hot gas inlet 3, the outlet gas moves upwards in a rotational flow shape under the action of the gas distributor 5, fully contacts with atomized ethylene carbonate droplets and is rapidly vaporized, the vaporized temperature is 202 ℃, and vaporized materials are sent out of the vaporizing device from the vaporized material outlet 4 after passing through the wire mesh demister 10 at the outlet. After the vaporization device runs continuously for 150 hours, a small amount of coking small particles appear in the device.
Example 2:
as shown in FIG. 2, the feeding temperature was 45℃and the feeding amount of 125kg/h of a ethylene carbonate liquid was fed into the feed spraying mechanism 2 from the liquid feed inlet 7, atomized into micro-sized droplets, and then ejected from the nozzle 8, and the droplets were fed into the vaporizing device for vaporization, the operating pressure of the vaporizing device was 5MPa. The feed temperature was 240℃and the molar concentration was 90%, and the feed amount was 5301Nm 3 The hot hydrogen per hour enters the vaporizing device from the hot gas inlet 3, the outlet gas moves upwards in a rotational flow shape under the action of the gas distributor 5, and fully contacts and rapidly gasifies atomized ethylene carbonate droplets, and the temperature after vaporization is 220 ℃. The tube flow area in the vaporizing device is provided with a baffle 6, the radial movement is enhanced to improve the gas-liquid mixing effect, promote the heat transfer and mass transfer process, ensure that a small amount of residual liquid is completely vaporized at the position, and the vaporized material is sent out of the vaporizing device from a vaporized material outlet 4 after passing through a silk screen demister 10 at the outlet. After the vaporization device continuously and stably operates for 200 hours, slightly coked small particles appear in the device.
Example 3:
as shown in FIG. 3, the feeding temperature was 150℃and the amount of each stream of ethylene carbonate liquid fed at 62.5kg/h was fed into the feed spraying mechanism 2 in two stages from the liquid feed inlet 7, atomized into micro-sized droplets, which were then sprayed out from the nozzle 8, and vaporized in each stage of vaporization apparatus, each stage of vaporization apparatus having an operating pressure of 3MPa. The feed temperature was 190℃and the molar concentration was 95% and the feed amount was 9369Nm 3 The hot hydrogen per hour enters the lower-stage vaporizing device from the hot gas inlet 3, the outlet gas moves upwards in a rotational flow shape under the action of the gas distributor 5, and fully contacts with small ethylene carbonate droplets entering the lower-stage vaporizing device and is rapidly vaporized, and the vaporized temperature is 186 ℃. The vaporized material enters an upper-stage vaporizing device after passing through a silk screen demister 10, under the action of a gas distributor 5, outlet gas continuously moves upwards in a swirling shape, fully contacts with small ethylene carbonate droplets entering the upper-stage vaporizing device and is rapidly vaporized, the vaporized temperature is 183 ℃, a baffling baffle 6 is arranged in a pipe flow area in the upper-stage vaporizing device, and radial movement is enhanced to improve the vaporizationThe gas-liquid mixing effect promotes the heat transfer and mass transfer process, ensures that a small amount of residual liquid is completely vaporized at the position, and the vaporized material is sent out of the vaporizing device through the vaporized material outlet 4 after passing through the silk screen demister 10 at the outlet. After the vaporization device continuously and stably operates for 200 hours, no obvious coking phenomenon exists in the vaporization device.
Comparative example 1:
as shown in fig. 6 and 7, the process operation parameters of this comparative example are the same as those of example 1, except that the inner member of example 1 is not used in the comparative example, but a general annular gas distributor 5 is used, and the gas is uniformly moved upward in the axial direction without radial disturbance after being acted on by the distributor. After the vaporization device continuously and stably operates for 72 hours, obvious coking phenomenon begins to appear in the vaporization device.
According to the comparative example, when the spray vaporization mode is adopted, the rapid complete vaporization of the ethylene carbonate can not be realized under the condition that the internal flow field is not strengthened, a small amount of unvaporized ethylene carbonate liquid is gradually coked, the vaporization device can be blocked even when serious, the shutdown is caused in actual production, and the continuous and stable long-period operation of a large-scale industrial device is not facilitated.
The method of the invention adopts the special designed internal component to strengthen the internal flow field of the vaporizing device on the basis of increasing the heat transfer area between gas and liquid by adopting a spray vaporizing mode, enhances the gas-liquid mixing effect by axial and radial bidirectional disturbance, effectively strengthens the gas-liquid mass transfer and heat transfer process, greatly improves the vaporizing efficiency, shortens the vaporizing time, ensures that the ethylene carbonate is vaporized rapidly in the environment with low superheat degree, and provides an industrially feasible vaporizing solution for the vaporizing process of the ethylene carbonate.
The previous description of the embodiments is provided to facilitate a person of ordinary skill in the art in order to make and use the present invention. It will be apparent to those skilled in the art that various modifications can be readily made to these embodiments and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above-described embodiments, and those skilled in the art, based on the present disclosure, should make improvements and modifications without departing from the scope of the present invention.
Claims (4)
1. The vaporization method is characterized in that the vaporization device comprises a vaporizer shell, a feed spraying mechanism and a gas distributor, wherein a vaporized material outlet and a hot gas inlet are respectively arranged at the top end and the bottom end of the vaporizer shell, the gas distributor is connected with the hot gas inlet and is used for introducing hot gas entering from the hot gas inlet into the vaporizer shell in a cyclone mode, and the feed spraying mechanism stretches into the vaporizer shell at a position above the gas distributor;
the gas distributor comprises a distributor main body connected with the hot gas inlet and used for uniformly distributing the hot gas, and a distributor outlet arranged on the side wall of the distributor main body, and guide blades are vertically arranged at the distributor outlet;
the included angle between the outlet of the distributor and the guide vane is an acute angle;
the height of the vaporizer shell is required to meet the vaporization time requirement, and a swirl zone positioned at the lower section and a pipe flow zone positioned at the upper section are formed in the vaporizer shell;
a baffle plate is also transversely and alternately arranged in the pipe flow area;
the vaporization method specifically comprises the following steps:
respectively introducing high boiling point substances and hot gas into the vaporizer shell through a feeding spraying mechanism and a hot gas inlet to complete vaporization;
the high boiling point substance is ethylene carbonate, and hot hydrogen with the molar concentration of 90-100% is corresponding to hot gas entering from a hot gas inlet, wherein the molar ratio of the hot hydrogen to the ethylene carbonate is 150-300:1;
the operating pressure of the vaporizing device is 2-5MPa, and the feeding temperature of the hot gas is 190-240 ℃.
2. The method of claim 1, wherein the vaporizer housing is further provided with a wire mesh demister at the vaporized material outlet.
3. A method of vaporizing a high boiling point material in a low superheat environment according to claim 1, wherein said feed spray mechanism comprises a liquid feed port disposed in a side wall of the vaporizer housing, a connecting conduit member connecting said liquid feed port and extending into the vaporizer housing, and an atomizing nozzle disposed on said connecting conduit member.
4. The method of claim 1, wherein the vaporizer housing, the feed spray mechanism and the gas distributor are provided in one-to-one correspondence with one or more groups, and adjacent vaporizer housings are connected in series when the vaporizer housing is provided with a plurality of groups.
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| CN204910817U (en) * | 2015-08-31 | 2015-12-30 | 大连艾一德环境能源工程有限公司 | Aqueous ammonia evaporimeter |
| CN107555698A (en) * | 2017-10-26 | 2018-01-09 | 上海辨洁环保科技有限公司 | Flash evaporator system and method for high concentration concentrate |
| CN110947382A (en) * | 2019-08-27 | 2020-04-03 | 天津大学 | Catalyst for preparing methanol and co-producing ethylene glycol by ethylene carbonate hydrogenation and preparation method thereof |
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