CN103933924A - Multitube large power cracking reactor - Google Patents
Multitube large power cracking reactor Download PDFInfo
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- CN103933924A CN103933924A CN201310679949.4A CN201310679949A CN103933924A CN 103933924 A CN103933924 A CN 103933924A CN 201310679949 A CN201310679949 A CN 201310679949A CN 103933924 A CN103933924 A CN 103933924A
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Abstract
The invention discloses a multitube large power cracking reactor, a reactor array tube is arranged in a case (1), the reactor array tube is composed of several layers of lateral array tube units, each layer of array tube unit comprises several U-shaped nickel tubes(2), several U-shaped nickel tubes(2) are mutually connected in series to form the array tube unit, an air inlet (3) and an air outlet (4) are respectively arranged at a head part and a tail part of each layer of the array tube unit, the air inlet (3) of each layer of the array tube unit is stretched out of the case (1) through an air inlet pipe (12) and is communicated to an air inlet/outlet main pipe(5) placed outside the case (1), the air outlet of each layer of the array tube unit is stretched out of the case (1) through an air outlet pipe (14) and is communicated to the air inlet/outlet main pipe(5) placed outside the case (1), a ceramic heating ring (6) sleeved on the U-shaped nickel tubes(2) is connected to an electrical control apparatus, and a top temperature measurement thermal resistance (7) and a side surface temperature measurement thermal resistance (13) are respectively arranged at top and side surface of the case.
Description
Technical field
The present invention relates to the high-power cracking reactor of a kind of multitube.
Background technology
The production of domestic hexafluoropropene and vinylidene mainly adopts blank pipe cracking technique, producer all adopts tubular reactor, be subject to thermal response through in the gas nickel pipe of preheating, reaction nickel pipe overcoat has high-temperature alloy pipe to carry out short circuit heating, adopt the heating power of low-voltage and high-current control heating, generally control by magnetic voltage regulator.The general separate unit ability of pyrolysis furnace is 500 tons of left and right, and each producer is the scale that increases separate unit pyrolysis furnace, and mainly the latus rectum by augmenting response tubulation or the cover tube short circuit that increases the length of reaction nickel pipe and be aided with coupling heat to realize.Device more than scale generally adopts nickel pipe more than DN40, and the length of reaction tube is 10 ~ 30 meters.Defect 1 that prior art exists: longer because of reaction nickel pipe, whole reactor needs vertical, and factory building is relatively high; Because the nickel pipe range phase is standing, the weight of whole tubulation is by entirely supporting by tubulation bottom, the at high temperature intensity step-down of nickel pipe, then the effect that is subject to expanding with heat and contract with cold, and nickel pipe is easy to damage; The length limited of single reaction nickel pipe, has restricted the raising of separate unit reactor capacity; Because the latus rectum of reaction nickel pipe is larger, heat transfer effect is bad, and in reaction nickel pipe, the temperature difference is larger, and wall temperature and central temperature difference are larger, have improved reaction temperature, can make wall temperature higher, and the probability that carbon distribution reaction occurs increases; Prior art exist defect 2: there is good stepless voltage regulation characteristic although short circuit adds the magnetic voltage regulator of thermal recovery, be widely used in various electric heating systems, but magnetic voltage regulator itself is exactly a large heater, dispel the heat more, copper chuck on heating muff also needs logical cooling water simultaneously, and these all make the thermal efficiency of electric heating system significantly decline; Magnetic voltage regulator also takies certain apparatus arrangement space, and by present apparatus arrangement safety standard, magnetic voltage regulator and main device must have certain safe distance, and this has increased again the cost of plant construction.In Chinese patent CN 1010034560 A, describe with R142b cracking for vinylidene cracking furnace pipe employing Φ 76*4 larger caliber metal tube, break through the limitation that domestic vinylidene reaction tube diameter is not more than Φ 40, boiler tube adopts U-shaped novel cascaded structure, pressure drop is little, be difficult for carbon distribution, inspection operation is convenient.This reactor heat transfer effect is poor, and in reaction tube, the larger defect of the temperature difference cannot overcome, and the reaction tube of larger latus rectum is unfavorable aspect heat transfer.In Chinese patent CN 2813610 Y, Multi-pipe cracking furnace for producing hexafluoropropene is described, it is characterized in that, in pyrolysis furnace, at least 2 cracking tubes are set, every cracking tube both can heat separately with heating jacket, also can share a heating muff and heat.This utility model multitube pyrolysis furnace adopts unified insulation can effectively prevent heat loss, and heat between each boiler tube is utilized mutually, reaches stable control stable, energy-conservation object, and production cost is reduced.This utility model patent is original technical progressive to some extent at home, but does not overcome the inherent shortcoming of original technology.Several independent reaction tubes are combined into a reactor, and the ability of reactor is simple stack, and between each boiler tube, heat utilizes mutually the reaction tube heat radiation of avoiding independent larger, but the length of reactor is still longer, and reaction tube easily damages; Its short circuit heating needs magnetic transformer, and the heat loss of magnetic transformer and heating muff copper chuck cannot be avoided.In Chinese patent CN 203209060 U, a kind of pyrolysis furnace of preparing vinylidene is described, particularly in cracking furnace tube, be provided with the static ribbon mixer of gas phase, and boiler tube inner side is with the pyrolysis furnace of preparing vinylidene of fin, by changing the structure of cracking furnace tube reactor, can be in effectively improving and promoting heat exchange, avoid the hot-spot of reaction mass, and then promoted the conversion ratio of preparing vinylidene cracking reaction with selective.This utility model is improved the structure of existing single tube cracking reactor, but structure is comparatively complicated, arrange that the shorter time of staying meaning of the relative blank pipe cracking of internals is also little, and unresolved cracking reactor production capacity is low, the defect that energy consumption is high in very little boiler tube.Along with the scale of domestic vinylidene and hexafluoropropene device is increasing, current various cracking reactors cannot accomplish that production capacity expands arbitrarily with the need, its reactive moieties of larger device is often taken up an area more, seem very huge, the operation and the control personnel that need are also more, increased construction and operating cost, the large novel reactor energy-conservation and characteristics of compact layout again of exploitation production capacity becomes the inevitable demand of domestic fluorochemical monomer production technology progress.
Summary of the invention
The invention provides the high-power cracking reactor of a kind of multitube, not only production capacity is large, temperature control is accurate for it, the less carbon distribution that is difficult for of the temperature difference in reaction tube, and long service life, the thermal efficiency up to more than 90%, heat-insulation layer is compact, is convenient to arrange installation.
The present invention has adopted following technical scheme: the high-power cracking reactor of a kind of multitube, described it comprise housing, in housing, be provided with reactor tubulation, housing and reactor tubulation form reactor sled piece, reactor tubulation is made up of the horizontal tubulation unit of some layers, the tubulation unit of every layer comprises some U-shaped nickel pipes, some U-shaped nickel pipes are mutually connected in series and form tubulation unit, the head of every stratose pipe unit and afterbody are respectively equipped with air inlet and gas outlet, the air inlet of every stratose pipe unit stretches out the outer house steward that enters/give vent to anger who places with housing of housing outward by air inlet pipe and is connected, the gas outlet of every stratose pipe unit is stretched out the outer house steward that enters/give vent to anger who places with housing of housing outward by escape pipe and is connected, there is ceramic heat circle at U-shaped nickel pipe box, ceramic heat circle is connected with electrical control gear, top and side at housing are respectively equipped with top temperature measurement thermal resistance and side thermometric thermal resistance, top temperature measurement thermal resistance and side thermometric thermal resistance insert in housing.Described housing is carbon steel, is provided with sled piece supporting leg in the bottom of housing.Described electrical control gear comprises electrical control cabinet, in electrical control cabinet, be provided with negative-feedback automatic temperature control system, negative-feedback automatic temperature control system is made up of intelligent program-controlled temperature controller and thyristor regulating pressing system, intelligent program-controlled temperature controller is provided with electrical heating electrical terminal by thyristor regulating pressing system and case top and is connected with ceramic heat circle, and ceramic heat circle is realized heat stepwise by the control of negative-feedback automatic temperature control system.In described housing, be vertically fixed with some fixed tube sheets, the U-shaped nickel pipe of dry stratose pipe unit is fixed in housing through the pore on fixed tube sheet.The inwall of described housing is provided with heat-insulation layer, and heat-insulation layer is made up of light thermal-insulation castable and the ceramic fibre of high temperature resistant heat insulation.Described housing is set to cylindricality or square-box-shaped.
The present invention has following beneficial effect: adopted after above technical scheme, the present invention can enhance production capacities, and can amplify production capacity by increasing the total length of reaction tube and the electrical heating of coupling; Multistage heating can fine adjustment the heating power of each section, make temperature control accurate; Use the less nickel pipe of latus rectum, the less carbon distribution that is difficult for of the temperature difference in reaction tube; Reaction nickel pipe is heated evenly, and in the state naturally stretching, extend service life; Reaction tube and electrical heating elements integral heat insulation, adopt the normal heating of short circuit frequently, do not use magnetic transformer, and overall thermal efficiency is high; Reaction tube is processed into U-shaped pipe, and heat-insulation layer compactness is convenient to arrange and is installed.Reactor separate unit ability of the present invention is larger, and its thermal efficiency reaches more than 90%, and temperature control is accurate, and in reaction tube, the temperature difference is less, can effectively alleviate cracking reaction carbon distribution phenomenon.
Brief description of the drawings
Fig. 1 is cut away left side view of the present invention.
Fig. 2 is vertical view cutaway drawing of the present invention.
Fig. 3 is front elevational view of the present invention.
Detailed description of the invention
Embodiment mono-, at Fig. 1, in Fig. 2 and Fig. 3, the invention provides the high-power cracking reactor of a kind of multitube, described it comprise housing 1, housing 1 is carbon steel, be provided with sled piece supporting leg 8 in the bottom of housing 1, in housing 1, be provided with reactor tubulation, housing and reactor tubulation form reactor sled piece, reactor tubulation is made up of seven layers of horizontal tubulation unit, the tubulation unit of every layer comprises two U-shaped nickel pipes 2, two U-shaped nickel pipe 2 serial connection formation tubulation unit mutually, each U-shaped nickel pipe 2 comprises two nickel pipes, connect into U-shaped nickel pipe 2 at two nickel pipes by u shaped connector, housing 1 is interior is vertically fixed with some fixed tube sheets 10, the U-shaped nickel pipe 2 of some stratose pipe units is fixed in housing 1 through the pore on fixed tube sheet 10, the head of every stratose pipe unit and afterbody are respectively equipped with air inlet 3 and gas outlet 4, the air inlet 3 of every stratose pipe unit is stretched out outside housing 1 and is connected with the house steward 5 that enters/give vent to anger of housing 1 outer placement by air inlet pipe 12, the gas outlet of every stratose pipe unit is stretched out outside housing 1 and is connected with the house steward 5 that enters/give vent to anger of housing 1 outer placement by escape pipe 14, reactor air inlet is assigned to air inlet 3 by entering/give vent to anger house steward 5, when exhaust by gas outlet 4 be pooled to into/house steward 5 gives vent to anger, there is ceramic heat circle 6 at U-shaped nickel pipe 2 covers, ceramic heat circle 6 is connected with electrical control gear, electrical control gear comprises electrical control cabinet, in electrical control cabinet, be provided with negative-feedback automatic temperature control system, negative-feedback automatic temperature control system is made up of intelligent program-controlled temperature controller and thyristor regulating pressing system, intelligent program-controlled temperature controller is provided with electrical heating electrical terminal 9 by thyristor regulating pressing system and case top and is connected with ceramic heat circle 6, ceramic heat circle carries out heat stepwise control, it is exothermic material that ceramic heat circle 6 adopts 8020 nickel-chromium resistance wires, high-density and high-temperature-resistant pottery is insulation and skeleton, heating resistor is greater than 100 megaohms, ceramic heat circle 6 is realized heat stepwise by the control of negative-feedback automatic temperature control system, electrical heating adopts the normal mode of heating of short circuit frequently, heating voltage is 0-400V, electric current is 0-300A, heating resistor is greater than 100 megaohms, reactor design temperature is 1000 DEG C, reaction tube and electrical heating elements entirety are incubated, housing 1 is carbon steel, form reactor sled piece, top and side at housing 1 are respectively equipped with top temperature measurement thermal resistance 7 and side thermometric thermal resistance 13, top temperature measurement thermal resistance 7 and side thermometric thermal resistance 13 insert in housing 1, the inwall of housing 1 is provided with heat-insulation layer 11, heat-insulation layer 11 is made up of light thermal-insulation castable and the ceramic fibre of high temperature resistant heat insulation, housing 1 is set to cylindricality or square-box-shaped, the present embodiment is set to square-box-shaped, square-box-shaped is of a size of 6400*2000*2500 centimetre, in tubulation of the present invention, produce cracking reaction, cracking reaction is that difluoromono-chloroethane HCFC-142b thermal cracking is produced vinylidene or tetrafluoroethene thermal cracking is produced hexafluoropropene.The ability of reactor of the present invention can expand by increasing reaction tube and electrical heating power, maximum 5000 tons of separate unit reactor annual capacity.U-shaped nickel pipe 2 latus rectums of the present invention are less than 40mm, are made up of many straight tubes 3 ~ 6 meters long and thickening elbow, and every group of U-shaped nickel pipe 2 total lengths are 30 meters to the maximum.The present invention is applied to 2000 tons/year of vinylidene cracking reactors, and this reactor sled piece is square-box-shaped, and profile is 6400*2000*2500, reactor design power 320KW, 1000 DEG C of design temperatures, reactor monolith insulation, electrical control cabinet only need be supplied 380V voltage.It is 7 tons/day that the present invention moves production capacity, annual capacity exceedes 2000 tons, working voltage is 380V to the maximum, electric current is 220A to the maximum, heating resistor exceedes 200 megaohms, and operate power is 280KW, and 500 tons/year of single tube short circuit heating pyrolyze stove operate powers of original device are 130KW, 2000 tons of production capacity general powers are 520KW, energy-conservation 50% left and right.
Claims (6)
1. the high-power cracking reactor of multitube, described in it is characterized in that, it comprises housing (1), in housing (1), be provided with reactor tubulation, housing and reactor tubulation form reactor sled piece, reactor tubulation is made up of the horizontal tubulation unit of some layers, the tubulation unit of every layer comprises some U-shaped nickel pipes (2), some U-shaped nickel pipes (2) mutually serial connection form tubulation unit, the head of every stratose pipe unit and afterbody are respectively equipped with air inlet (3) and gas outlet (4), the air inlet (3) of every stratose pipe unit is stretched out outside housing (1) and is connected with the outer house steward (5) that enters/give vent to anger who places of housing (1) by air inlet pipe (12), the gas outlet of every stratose pipe unit is stretched out outside housing (1) and is connected with the outer house steward (5) that enters/give vent to anger who places of housing (1) by escape pipe (14), there is ceramic heat circle (6) at U-shaped nickel pipe (2) cover, ceramic heat circle (6) is connected with electrical control gear, top and side at housing are respectively equipped with top temperature measurement thermal resistance (7) and side thermometric thermal resistance (13), top temperature measurement thermal resistance (7) and side thermometric thermal resistance (13) insert in housing (1).
2. the high-power cracking reactor of multitube according to claim 1, is characterized in that described housing (1) is carbon steel, is provided with sled piece supporting leg (8) in the bottom of housing (1).
3. the high-power cracking reactor of multitube according to claim 1, it is characterized in that described electrical control gear comprises electrical control cabinet, in electrical control cabinet, be provided with negative-feedback automatic temperature control system, negative-feedback automatic temperature control system is made up of intelligent program-controlled temperature controller and thyristor regulating pressing system, intelligent program-controlled temperature controller is provided with electrical heating electrical terminal (9) by thyristor regulating pressing system and case top and is connected with ceramic heat circle (6), and ceramic heat circle (6) is realized heat stepwise by the control of negative-feedback automatic temperature control system.
4. the high-power cracking reactor of multitube according to claim 1, it is characterized in that being vertically fixed with some fixed tube sheets (10) in described housing (1), the U-shaped nickel pipe (2) of dry stratose pipe unit is fixed in housing (1) through the pore on fixed tube sheet (10).
5. the high-power cracking reactor of multitube according to claim 1, the inwall of the housing it is characterized in that (1) is provided with heat-insulation layer (11), and heat-insulation layer (11) is made up of light thermal-insulation castable and the ceramic fibre of high temperature resistant heat insulation.
6. according to the high-power cracking reactor of multitube described in claim 1,4 or 5, it is characterized in that described housing (1) is set to cylindricality or square-box-shaped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310679949.4A CN103933924A (en) | 2013-12-16 | 2013-12-16 | Multitube large power cracking reactor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310679949.4A CN103933924A (en) | 2013-12-16 | 2013-12-16 | Multitube large power cracking reactor |
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| CN103933924A true CN103933924A (en) | 2014-07-23 |
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| CN201310679949.4A Pending CN103933924A (en) | 2013-12-16 | 2013-12-16 | Multitube large power cracking reactor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112705150A (en) * | 2020-11-05 | 2021-04-27 | 中国恩菲工程技术有限公司 | Composite material preparation device and method |
| USRE49861E1 (en) * | 2020-08-14 | 2024-03-05 | Komax Systems, Inc. | Torrefaction process |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000206069A (en) * | 1999-01-14 | 2000-07-28 | Riken Keiki Co Ltd | Thermal reaction furnace for analysis |
| CN1446621A (en) * | 2003-04-18 | 2003-10-08 | 清华大学 | Tube type device respondent to water heat in high temperature and pressure |
| CN102188936A (en) * | 2011-05-25 | 2011-09-21 | 太原理工大学 | Fixed bed reactor |
| CN203100158U (en) * | 2013-02-08 | 2013-07-31 | 上海森松新能源设备有限公司 | Electric heating unit |
-
2013
- 2013-12-16 CN CN201310679949.4A patent/CN103933924A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000206069A (en) * | 1999-01-14 | 2000-07-28 | Riken Keiki Co Ltd | Thermal reaction furnace for analysis |
| CN1446621A (en) * | 2003-04-18 | 2003-10-08 | 清华大学 | Tube type device respondent to water heat in high temperature and pressure |
| CN102188936A (en) * | 2011-05-25 | 2011-09-21 | 太原理工大学 | Fixed bed reactor |
| CN203100158U (en) * | 2013-02-08 | 2013-07-31 | 上海森松新能源设备有限公司 | Electric heating unit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| USRE49861E1 (en) * | 2020-08-14 | 2024-03-05 | Komax Systems, Inc. | Torrefaction process |
| CN112705150A (en) * | 2020-11-05 | 2021-04-27 | 中国恩菲工程技术有限公司 | Composite material preparation device and method |
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