CN202169172U - Liquid vaporization equipment - Google Patents
Liquid vaporization equipment Download PDFInfo
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- CN202169172U CN202169172U CN2011201325549U CN201120132554U CN202169172U CN 202169172 U CN202169172 U CN 202169172U CN 2011201325549 U CN2011201325549 U CN 2011201325549U CN 201120132554 U CN201120132554 U CN 201120132554U CN 202169172 U CN202169172 U CN 202169172U
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- liquid
- cyclohexanone oxime
- temperature gas
- atomizing lance
- atomizing
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Abstract
The utility model relates to a piece of liquid vaporization equipment, which comprises a vaporizer housing (7), an atomizing spray gun (3) in the vaporizer and a high temperature air distributor (6); the top of the vaporizer housing (7) is provided with an air phase material outlet (8); the atomizing spray gun (3) includes a gun body and an atomizing nozzle (4); an inlet of the atomizing spray gun (3) is connected with a liquid material inlet (1) and an air material inlet (2); the high temperature air distributor (6) is located below the atomizing nozzle (4); and the other end of the high temperature air distributor is provided with a high temperature air inlet (5). The liquid vaporization equipment can realize quick vaporization of heat-sensitive liquid and prevent coking of cyclohexanoneoxime in the vaporization process, and is in particular suitable for the vaporization process of the cyclohexanoneoxime.
Description
Technical field
The utility model relates to a kind of vaporizing liquid equipment, more particularly, relates to a kind of cyclohexanone oxime vaporising device that is used for caprolactam technology.
Background technology
Epsilon-caprolactams (being designated hereinafter simply as caprolactam) is a primary raw material of producing polyamide fibre, industrial cord fabric thread and nylon engineering plastic three big series of products, and along with the continuous increase of domestic engineering plastics demand, its demand also is the trend that increases year by year.Cyclohexanone oxime Beckmann rearrangement explained hereafter caprolactam comprises two kinds of liquid phase method and vapor phase methods; Liquid phase method adopts the concentrated sulfuric acid or oleum as catalyst; Behind the catalysis of pimelinketone oxime generation Beckmann rearrangement; Use the acid in the ammonia neutralization reaction system again, generate caprolactam and accessory substance ammonium sulfate etc.It is the ammonium sulfate of a large amount of low value of by-product that liquid phase method is produced the maximum shortcoming of caprolactam technology, adopts sulfuric acid to cause equipment corrosion and serious environmental pollution as catalyst in addition.Vapor phase method as acidic catalyst, need not consume sulfuric acid with the molecular sieve of MFI structure in technical process, make the production process of caprolactam become green more, therefore receives extensive concern gradually.
Produce in the caprolactam technology at the cyclohexanone oxime gas phase beckmann rearrangement, cyclohexanone oxime must get into reactor with the gas phase form and participate in reaction.Because cyclohexanone oxime belongs to the height heat-sensitive substance, under normal pressure, the vapourizing temperature of cyclohexanone oxime is more than 208 ℃.In vaporescence, the cyclohexanone oxime of liquid phase side reactions such as polycondensation very easily occur and the on-catalytic coking phenomenon takes place.Therefore the cyclohexanone oxime vaporization is one of key technology of gas phase beckmann rearrangement production caprolactam technology.The gasification method of the cyclohexanone oxime of document record mainly contains following several kinds.
US4268440 discloses a kind of cyclohexanone oxime gasification method, and wherein cyclohexanone oxime is under the environment of inert gas, to contact with inert particle such as silica sand through fluid bed to vaporize.This method still can not avoid a part of cyclohexanone oxime in fluid bed, to decompose or coking, causes in the cyclohexanone oxime vaporescence material consumption higher; The coking product blocks the bed passage, and bed pressure drop constantly increases, and need improve constantly the increase that the inlet pressure of inert gas is come balance fluid bed bed pressure drop, and it is bigger therefore to control difficulty; In addition, adopt the employed fluid unit complex structure of gasification method of fluid bed.
US4137263 discloses a kind of cyclohexanone oxime gasification method, and this method adopts falling film evaporator vaporization cyclohexanone oxime liquid, in absolute pressure is to make the cyclohexanone oxime vaporization under the condition of 1060 holders, and vapourizing temperature is controlled at below 170 ℃.This method is in the cyclohexanone oxime vaporescence, and the cyclohexanone oxime tar that has been heated produces, and need add complicated affiliated facility in order to remove tar, simultaneously tar can be on the surface of falling film evaporator knot carbon, reducing vaporization efficency also has the danger of stopping up evaporator pipeline.Because the cyclohexanone oxime material has high susceptibility to high temperature; Often need take lower vapourizing temperature; Thereby need follow-up temperature-rise period just can reach the needed reaction temperature of gas phase beckmann rearrangement, operating procedure and equipment relative complex, and increased the coking risk in the subsequent process.
Present disclosed cyclohexanone oxime vaporising device has forms such as traditional heat exchanger or fluid bed.This kind equipment all has the phenomenon of hot-spot.Cyclohexanone oxime liquid is heated hot-spot that inequality causes extremely easily and forms tar or coking in the vaporescence that is heated.Therefore press for a kind of quick, easy vaporising device of exploitation.
The utility model content
The purpose of the utility model provides a kind of vaporizing liquid equipment, is applied in the preparing process of caprolactam effectively to prevent cyclohexanone oxime coking in gasification.
The vaporizing liquid equipment that the utility model provides comprises vaporizer shell 7, inner atomizing lance 3 and the high-temperature gas distributor 6 of vaporizer, and the top of vaporizer shell 7 is gaseous phase materials outlet 8; Wherein, described atomizing lance 3 comprises rifle body and atomizer 4, and atomizing lance 3 inlets connect liquid inlet opening 1 and gas charging aperture 2, and described high-temperature gas distributor 6 is positioned under the atomizer 4, and the high-temperature gas distributor other end is a high-temperature gas inlet 5.
The beneficial effect of the vaporizing liquid equipment that the utility model provides is:
Described vaporizing liquid equipment is applicable to the cyclohexanone oxime vaporescence, in use, earlier the cyclohexanone oxime atomizing is droplet, contact with high-temperature gas then rapidly and vaporizes, and can effectively eliminate the cyclohexanone oxime coking of being heated.The vaporizing liquid equipment of the utility model is installed in the Cyclohexanone-Oxime Gas Phase Beckmann Rearrangement device, and cyclohexanone oxime vaporization back directly gets into catalyst bed reaction, and liquid conveying, vaporization, reaction three organically combine, and control easy.
Description of drawings
Accompanying drawing is the vaporizing liquid device structure sketch map that the utility model provides;
Wherein, 1-liquid inlet opening, 2-gas feed mouth, 3-atomizing lance, 4-atomizer, 5-high-temperature gas inlet, 6-high-temperature gas distributor, 7-vaporizer shell, the outlet of 8-gaseous phase materials.
The specific embodiment
The vaporizing liquid equipment that the utility model provides comprises vaporizer shell 7, inner atomizing lance 3 and the high-temperature gas distributor 6 of vaporizer, and the top of vaporizer shell 7 is gaseous phase materials outlet 8; Wherein, described atomizing lance 3 comprises rifle body and atomizer 4, and atomizing lance 3 inlets connect liquid inlet opening 1 and gas charging aperture 2, and described high-temperature gas distributor 6 is positioned under the atomizer 4, and the high-temperature gas distributor other end is a high-temperature gas inlet 5.
In the vaporizing liquid equipment that the utility model provides, described atomizing lance is can be the atomization plant of droplet with the cyclohexanone oxime atomization of liquid.The gun type not restriction of the utility model to being selected for use.Described atomizing lance can be mechanical atomization formula spray gun (pressure atomization) or twin formula spray gun.In the atomizing lance that is adopted in the vaporizing liquid equipment that the utility model provides, preferably adopt the twin spray gun, the twin spray gun is promptly introduced the gun type that atomization air flow makes that liquid atomizes fast.The twin spray gun is compared with single current atomizing lance (mechanical atomization), owing to let liquid and atomization gas mix the back ejection, can obtain the drop more small than single fluid nozzle, and wherein the high more particle diameter of the volume ratio of atomization gas and liquid just attenuates more.In addition, the nozzle diameter of two-fluid spray gun is bigger, can avoid the foreign matter clogging.
The twin spray gun is according to interactional different two kinds of exterior mixing and the internal-mixings that are divided into of liquid and atomization gas; Exterior mixing is that aerodynamic atomization liquid mainly carries out outside spout place or spout; Internal-mixing is then before spout and after the local atomizing; Spraying continuation atomizing, for example hydrocone type atomizing lance through spout.In the atomizing lance that is adopted in the vaporizing liquid equipment that the utility model provides, more preferably internal-mixing double fluid atomizing lance, internal-mixing atomizing lance atomization gas consumption still less, atomization quality is better.
Described atomizing lance basic structure comprises the body of a gun, nozzle, control assembly and other annexes etc.Liquid such as cyclohexanone oxime are introduced spray gun by liquid inlet opening 1, and gas is got in the atomizing lance 3 rifle bodies by gas feed mouth 2.It is droplet that high velocity air drives the cyclohexanone oxime atomization of liquid.Cyclohexanone oxime liquid can suck fluid passage through liquid inlet opening 1 certainly through the low-pressure area pull of vacuum; Perhaps deliver in the liquid inlet opening 1 through the pump equipressure.
In the vaporizing liquid equipment that the utility model provides, described atomizing lance 3 further preferred hydrocone type atomizing lances.Siphon gas atomization spray gun mainly relies on Venturi effect to improve the flow velocity of gas; At the inner low-pressure area that is lower than the liquid feed pressure that forms of spray gun; Consequent pressure reduction; Liquid extracting is come out, and it adds liquid that the strong production negative-pressure siphon advances shower nozzle has certain pressure and impinges upon on the shower nozzle, forms mist.Spray gun basic structure comprises the body of a gun, nozzle.
Adopt the hydrocone type atomizing lance; The liquid charging is under the condition of no outside conveying equipment; Supply with by the liquid siphon transmission means, use this kind spray gun under a large amount of gas effects, need not under the pumping condition, directly the liquid suction line; When using the hydrocone type atomizing lance, the distance of spray tip and cyclohexanone oxime liquid level is that siphon height is not higher than 90 centimetres.In addition, the use of a large amount of gases has improved the atomizing vapour-liquid ratio, and atomizing disperses desirable more.
The vaporizing liquid equipment that the utility model provides, described high-temperature gas distributor 6 is any equipment that the high-temperature gas uniform distribution is sprayed into vaporizer shell.The use of gas distributor not only can evenly disperse high temperature inert gas, and suitable change high-temperature gas ejection angle can be adjusted the effect that contacts with atomizing fluids.In the vaporizing liquid equipment that the utility model provides, described high-temperature gas distributor preferred construction is tapered gas vent form of tubes.Described tapered gas outlet tube angle is 45-75 °.
The vaporizing liquid equipment that the utility model provides, described vaporizer shell bottom preferably is provided with access hole.
The vaporizing liquid equipment that the utility model provides is applicable to the atomization process to the more sensitive liquid of heat.The vaporescence that is particularly useful for cyclohexanone oxime liquid is dispersed into a large amount of small drops through atomizing lance with the cyclohexanone oxime atomization of liquid earlier, contacts with the high temperature inert gas of introducing through the high-temperature gas distributor and realizes vaporescence.Cyclohexanone oxime charging after the atomizing has bigger surface area, has increased the alternate heat transfer area of gas-liquid greatly, has strengthened the heat transfer process of high-temperature medium and cyclohexanone oxime, to realize the cyclohexanone oxime instant vaporization.Vaporescence has shortened the transformation time of cyclohexanone oxime greatly fast, has suppressed the side reaction (like condensation course) of cyclohexanone oxime in vaporization, thereby has reduced the coking in the cyclohexanone oxime vaporization.Simultaneously, because fast vaporization, can avoid drop reassembling and weaken atomizing effect at the volley.
The vaporizing liquid equipment that the utility model provides in use, the vaporescence that relates to not with the wall Contact Evaporating, therefore can not occur thermo-responsive liquid for example cyclohexanone oxime in vaporescence, contact and the coking of appearance easily with hot wall.
The vaporizing liquid device interior that the utility model provides only comprises gas atomization spray gun and high-temperature gas distributor, and is simple in structure, is convenient to maintenance and repair.
The vaporizing liquid equipment that the utility model provides adopts the siphon atomizing lance in the presence of a large amount of gas atomization media, at a high speed from the spray gun ejection, at the inner low-pressure area that is lower than the cyclohexanone oxime feed pressure that forms of spray gun.The liquid charging is got in the siphon gas atomization spray gun with the form that sucks certainly.Based on siphon atomizing lance atomizing work characteristics, than other atomizing types, the atomizing effect of siphon atomization process is better and simplified the course of conveying of cyclohexanone oxime.
The course of work of the vaporizing liquid equipment that the utility model provides is the example explanation with the accompanying drawing.The liquid charging with get in the vaporizing liquid device housings 7 from liquid inlet opening 1 and gas charging aperture 2 respectively as the inert gas of atomizing medium.Under the effect of gas, liquid charging atomizing is sprayed from atomizer 4 for droplet.High temperature gas medium gets into the high-temperature gas transfer pipeline from high-temperature gas inlet 5, and from the tapered spout ejection of high-temperature gas distributor 6, ejection back high temperature gas medium contacts instant vaporization with droplet.Liquid after the vaporization is kept the short time of staying in vaporizer shell 7, draw subsequent step from gaseous phase materials outlet 8 fast.
Specify the effect of the utility model below through embodiment, but therefore the utility model does not receive any restriction.
Embodiment
Embodiment explains the effect of the cyclohexanone oxime vaporising device that the utility model provides.
Shown in accompanying drawing 1, cyclohexanone oxime is introduced in the vaporizer by liquid inlet opening 1, and inlet amount is 100Kg/h, and feeding temperature is 120 ℃, and feed pressure is 0.4MPa.Atomizing medium nitrogen is introduced by gas feed mouth 2, and flow is 50Nm
3/ h, pressure are 0.25MPa (absolute pressure), and mixed fluid gets into the gas atomizer cavity.Under the effect of nitrogen atomization medium, cyclohexanone oxime is atomized fast is droplet.High temperature nitrogen is introduced through high-temperature gas inlet 5, introduces in the vaporizer through high-temperature gas distributor 6, and nitrogen flow is 1570kg/h.The cyclohexanone oxime droplet contacts with 450 ℃ of high temperature nitrogen, instant vaporization, and vaporization back temperature is 390 ℃.Cyclohexanone oxime gas after the vaporization is drawn the vaporizing liquid device through gaseous phase materials outlet 8, gets into reactor.Vaporizer operation 700 hours does not have obvious coking phenomenon in the vaporizer.
Comparative Examples
Cyclohexanone oxime vaporization effect in the Comparative Examples explanation prior art.
The vaporizing liquid equipment that cyclohexanone oxime provides without the utility model, directly with the hot nitrogen Contact Evaporating after the reaction bed of entering reactor.The inlet amount of cyclohexanone oxime is 100kg/h, and feed pressure is 0.5MPa; The hot nitrogen injection rate is 1570kg/h.Vapourizing temperature is 391 ℃.Turned round 50 hours, and the obvious coking phenomenon of appearance was arranged, bulky grain knot carbon occurs at bottom of vaporizing chamber.
Claims (6)
1. a vaporizing liquid equipment is characterized in that, comprises vaporizer shell (7), inner atomizing lance (3) and the high-temperature gas distributor (6) of vaporizer, and the top of vaporizer shell (7) is gaseous phase materials outlet (8); Wherein, Described atomizing lance (3) comprises rifle body and atomizer (4); Atomizing lance (3) inlet connects liquid inlet opening (1) and gas charging aperture (2), and described high-temperature gas distributor (6) is positioned under the atomizer (4), and the high-temperature gas distributor other end is a high-temperature gas inlet (5).
2. according to the vaporizing liquid equipment of claim 1, it is characterized in that described atomizing lance (3) is the twin spray gun.
3. according to the vaporizing liquid equipment of claim 2, it is characterized in that described atomizing lance (3) is the hydrocone type atomizing lance.
4. according to the vaporizing liquid equipment of claim 1 or 2, it is characterized in that described high-temperature gas distributor (6) is tapered gas vent form of tubes.
5. according to the vaporizing liquid equipment of claim 4, it is characterized in that the tapered outlet angle of described high-temperature gas distributor (6) is 45-75 °.
6. according to the vaporizing liquid equipment of claim 1 or 2, it is characterized in that described vaporizer shell bottom is provided with access hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201325549U CN202169172U (en) | 2011-04-29 | 2011-04-29 | Liquid vaporization equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201325549U CN202169172U (en) | 2011-04-29 | 2011-04-29 | Liquid vaporization equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202169172U true CN202169172U (en) | 2012-03-21 |
Family
ID=45827376
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201325549U Expired - Lifetime CN202169172U (en) | 2011-04-29 | 2011-04-29 | Liquid vaporization equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202169172U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102755860A (en) * | 2011-04-29 | 2012-10-31 | 中国石油化工股份有限公司 | Cyclohexanone-oxime vaporizing method |
-
2011
- 2011-04-29 CN CN2011201325549U patent/CN202169172U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102755860A (en) * | 2011-04-29 | 2012-10-31 | 中国石油化工股份有限公司 | Cyclohexanone-oxime vaporizing method |
| CN102755860B (en) * | 2011-04-29 | 2015-04-29 | 中国石油化工股份有限公司 | Cyclohexanone-oxime vaporizing method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120321 |