CN105413221A - Rectifying system - Google Patents
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- CN105413221A CN105413221A CN201610031853.0A CN201610031853A CN105413221A CN 105413221 A CN105413221 A CN 105413221A CN 201610031853 A CN201610031853 A CN 201610031853A CN 105413221 A CN105413221 A CN 105413221A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
- B01D3/143—Fractional distillation or use of a fractionation or rectification column by two or more of a fractionation, separation or rectification step
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Abstract
The invention provides a rectifying system. The rectifying system comprises multiple rectifying towers, a reboiler; each rectifying tower is provided with an upper outlet, a lower outlet, as well as a backflow port and an air return port arranged between the upper outlet and the lower outlet; the reboiler is provided with a liquid inlet, an air outlet, an air inlet and a liquid outlet; the liquid inlet is communicated with the lower outlet of one of the rectifying towers, and the air outlet is communicated with the air return port of the rectifying tower; the air inlet is communicated with the upper outlet of another one of the multiple rectifying towers, and the liquid outlet is communicated with the backflow port of the rectifying tower. Technical solutions of the invention can effectively solve the problem of higher energy consumption of a multicrystal silicon rectifying system in prior art.
Description
Technical field
The present invention relates to technical field of rectification, in particular to a kind of distillation system.
Background technology
Polysilicon is the key raw material of integrated circuit and photovoltaic generation.In recent years, along with the fast development in photovoltaic generation market, production of polysilicon industry is fast development thereupon also.But the blind expansion of production of polysilicon industry also brings the problem that production cost increases, profit level reduces, and polysilicon product price is plummeted especially at present, and the production cost of most of producer is all higher than sale price simultaneously.Under these circumstances, energy saving and cost lowering becomes the necessary means that each production of polysilicon producer maintains sustainable development.
At present, in polysilicon production process, refining purification process is one of operation that energy consumption is higher.The main energy sources of this refining purification process consumption comprises steam (hot water), high-low pressure recirculated water and electric energy etc., and wherein the energy ezpenditure of steam (hot water) and recirculated water accounts for more than 90%.Meanwhile, because the internal circulating load of recirculated water is comparatively large, often cause water evaporating loss comparatively large, thus increase the weight of the consumption of energy further.In addition, as depicted in figs. 1 and 2, the reboiler 2 ' that existing distillation system comprises rectifying column 1 ' and is connected with this rectifying column 1 ', wherein, reboiler 2 ', in order to send rectifying column 1 ' back to by after liquid components vaporize at the bottom of the tower of rectifying column 1 ', makes the contact mass transfer in tower between gas-liquid two-phase be carried out.Fig. 1 illustrates a kind of flow process (bottom product of upstream rectifying column is as the raw material of downstream rectifying column) of existing distillation system, and Fig. 2 illustrates the another kind of flow process (overhead product of upstream rectifying column is as the raw material of downstream rectifying column) of existing distillation system.In above-mentioned two kinds of flow processs, reboiler 2 ' needs additionally to add thermal source outside system, and energy consumption so also can be caused higher.When actual production, in order to reduce operating cost, in view of the electricity price advantage of western China, most of larger production of polysilicon producer all starts to carry out in western China production of founding the factory, but another energy resource structure feature in west area is exactly water resources shortage.Therefore, the refining purification schemes that is applied to polysilicon is at present inapplicable in west area, and this just constrains the development of production of polysilicon industry.
Summary of the invention
Main purpose of the present invention is to provide a kind of distillation system, to solve the higher problem of polysilicon rectifying system energy consumption of the prior art.
To achieve these goals, the invention provides a kind of distillation system, comprising: multiple rectifying column, there is upper outlet, lower outlet and the refluxing opening be arranged between upper outlet, lower outlet and gas returning port; Reboiler, there is inlet, gas outlet, air inlet and liquid outlet, the lower outlet of one in inlet and multiple rectifying column, gas outlet is communicated with the gas returning port of this rectifying column, air inlet is communicated with another the upper outlet in multiple rectifying column, and liquid outlet is communicated with the refluxing opening of this rectifying column.
Further, rectifying column comprises: the first rectifying column, has the first upper outlet, first time outlet and is arranged on the first import between the first upper outlet and first time outlet, the first refluxing opening and the first gas returning port; Second distillation column, has the second upper outlet, second time outlet and the second import be arranged between the second upper outlet and second time outlet and the second refluxing opening; Reboiler comprises: the first reboiler, has the first inlet, the first gas outlet, the first air inlet and the first liquid outlet, the first inlet and first time outlet, and the first gas outlet is communicated with the first gas returning port; Wherein, the first air inlet is communicated with the second upper outlet, and the first liquid outlet is communicated with the second refluxing opening, first time outlet and the second inlet communication.
Further, rectifying column comprises: the first rectifying column, has the first upper outlet, first time outlet and the first import be arranged between the first upper outlet and first time outlet and the first refluxing opening; Second distillation column, has the second upper outlet, second time outlet and is arranged on the second import between the second upper outlet and second time outlet, the second refluxing opening and the second gas returning port; Reboiler comprises: the second reboiler, has the second inlet, the second gas outlet, the second air inlet and the second liquid outlet, the second inlet and second time outlet, and the second gas outlet is communicated with the second gas returning port; Wherein, the second air inlet is communicated with the first upper outlet, the second liquid outlet and the first refluxing opening and the second inlet communication.
Further, distillation system also comprises the first condenser, and the first condenser comprises: the first housing, and the bottom of the first housing has the first inlet section, and the top of the first housing has the first outlet section; First fan assembly, is positioned at the first outlet section place; First cooling tube group, to be arranged in the first housing and between the first inlet section and the first outlet section, first cooling tube group has the first charging aperture, the second charging aperture, the 3rd charging aperture and the first discharging opening, the second discharging opening, the 3rd discharging opening, and second time outlet is communicated with the first charging aperture; First liquid distributor, is arranged in the first housing, first liquid distributor between the first outlet section and the first cooling tube group to make liquid be uniformly distributed in the first cooling tube group.
Further, the first upper outlet is communicated with the first refluxing opening, and the first upper outlet is communicated with the second charging aperture, and the first liquid outlet is communicated with the 3rd charging aperture.
Further, distillation system also comprises the second condenser, and the second condenser comprises: the second housing, and the bottom of the second housing has the second inlet section, and the top of the second housing has the second outlet section; Second fan assembly, is positioned at the second outlet section place; Second cooling tube group, is arranged in the second housing and between the second inlet section and the second outlet section, the second cooling tube group has the 4th charging aperture and the 4th discharging opening; Second liquid distributor, is arranged in the second housing, second liquid distributor between the second outlet section and the second cooling tube group to make liquid be uniformly distributed in the second cooling tube group; 3rd cooling tube group, 3rd cooling tube group to be arranged in the second housing and between the second outlet section and second liquid distributor, 3rd cooling tube group has the 5th charging aperture and the 5th discharging opening, 5th discharging opening is communicated with the 4th charging aperture, 5th charging aperture is communicated with the first upper outlet, and the 4th discharging opening is communicated with the second charging aperture with the first refluxing opening.
Further, distillation system also comprises the first condenser, and the first condenser comprises: the first housing, and the bottom of the first housing has the first inlet section, and the top of the first housing has the first outlet section; First fan assembly, is positioned at the first outlet section place; First cooling tube group, to be arranged in the first housing and between the first inlet section and the first outlet section, first cooling tube group has the first charging aperture, the second charging aperture, the 3rd charging aperture and the first discharging opening, the second discharging opening, the 3rd discharging opening, and second time outlet is communicated with the first charging aperture; First liquid distributor, is arranged in the first housing, first liquid distributor between the first outlet section and the first cooling tube group to make liquid be uniformly distributed in the first cooling tube group.
Further, the second upper outlet is communicated with the second refluxing opening, and the second upper outlet is communicated with the 3rd charging aperture, and first time outlet is communicated with the second charging aperture.
Further, distillation system also comprises the second condenser, and the second condenser comprises: the second housing, and the bottom of the second housing has the second inlet section, and the top of the second housing has the second outlet section; Second fan assembly, is positioned at the second outlet section place; Second cooling tube group, is arranged in the second housing and between the second inlet section and the second outlet section, the second cooling tube group has the 4th charging aperture and the 4th discharging opening; Second liquid distributor, is arranged in the second housing, second liquid distributor between the second outlet section and the second cooling tube group to make liquid be uniformly distributed in the second cooling tube group; 3rd cooling tube group, 3rd cooling tube group to be arranged in the second housing and between the second outlet section and second liquid distributor, 3rd cooling tube group has the 5th charging aperture and the 5th discharging opening, 5th discharging opening is communicated with the 4th charging aperture, 5th charging aperture is communicated with the second upper outlet, and the 4th discharging opening is communicated with the 3rd charging aperture with the second refluxing opening.
Further, the first condenser also comprises the first demister, and the first demister to be arranged in the first housing and between the first outlet section and first liquid distributor.
Apply technical scheme of the present invention, be connected to by reboiler in multiple rectifying column, the lower outlet of the inlet of this reboiler and this rectifying column, gas outlet is communicated with the gas returning port of this rectifying column.The air inlet of above-mentioned reboiler is communicated with another the upper outlet in multiple rectifying column, and liquid outlet is communicated with the refluxing opening of this rectifying column.Said structure can make the thermal source of the reboiler be connected in multiple rectifying column be provided by the overhead product (such as overhead vapours) of another in multiple rectifying column, the energy in distillation system can be made full use of like this, thus effectively reduce system energy consumption.
Accompanying drawing explanation
The Figure of description forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 shows the structural representation of a kind of flow process of distillation system of the prior art;
Fig. 2 shows the structural representation of the another kind of flow process of distillation system of the prior art;
Fig. 3 shows the structural representation of the embodiment one according to distillation system of the present invention;
Fig. 4 shows the structural representation of the embodiment two according to distillation system of the present invention;
Fig. 5 shows the cross-sectional schematic of the first condenser of the distillation system of Fig. 3;
Fig. 6 shows the schematic side view of first condenser of Fig. 5; And
Fig. 7 shows the cross-sectional schematic of the second condenser of the distillation system of Fig. 3.
Wherein, above-mentioned accompanying drawing comprises the following drawings mark:
1 ', rectifying column; 2 ', reboiler; 11, the first rectifying column; 111, the first upper outlet; 112, first time outlet; 113, the first import; 114, the first refluxing opening; 115, the first gas returning port; 12, Second distillation column; 121, the second upper outlet; 122, second time outlet; 123, the second import; 124, the second refluxing opening; 125, the second gas returning port; 21, the first reboiler; 211, the first inlet; 212, the first gas outlet; 213, the first air inlet; 214, the first liquid outlet; 22, the second reboiler; 221, the second inlet; 222, the second gas outlet; 223, the second air inlet; 224, the second liquid outlet; 30, the first condenser; 31, the first inlet section; 32, the first outlet section; 33, the first fan assembly; 34, the first cooling tube group; 341, the first charging aperture; 342, the second charging aperture; 343, the 3rd charging aperture; 344, the first discharging opening; 345, the second discharging opening; 346, the 3rd discharging opening; 35, first liquid distributor; 36, the first demister; 40, the second condenser; 41, the second inlet section; 42, the second outlet section; 43, the second fan assembly; 44, the second cooling tube group; 441, the 4th charging aperture; 442, the 4th discharging opening; 45, second liquid distributor; 46, the 3rd cooling tube group; 461, the 5th charging aperture; 462, the 5th discharging opening; 47, the second demister; 48, gas-liquid separation device.
Detailed description of the invention
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
As shown in Figure 3, the distillation system of embodiment one is the first flow process (namely the bottom product of upstream rectifying column is as the raw material of downstream rectifying column) of refining purification for polysilicon, and this distillation system comprises the first rectifying column 11, Second distillation column 12 and the first reboiler 21.Wherein, the first rectifying column 11 has the first import 113, first refluxing opening 114 and the first gas returning port 115 that the first upper outlet exports 112 for 111, first time and is arranged between the first upper outlet 111 and first time outlet 112.The second import 123 and the second refluxing opening 124 that Second distillation column 12 has 121, the second time outlet 122 of the second upper outlet and is arranged between the second upper outlet 121 and second time outlet 122.First reboiler 21 has the first inlet 211, first gas outlet 212, first air inlet 213 and the first liquid outlet 214.First inlet 211 with export 112 first time and be communicated with.First gas outlet 212 is communicated with the first gas returning port 115.First air inlet 213 is communicated with the second upper outlet 121.First liquid outlet 214 is communicated with the second refluxing opening 124.First time outlet 112 is communicated with the second import 123.In the first flow process above-mentioned, the bottom product of the first rectifying column 11 is entered in Second distillation column 12 by first time outlet the 112, second import 123 as the raw material of Second distillation column 12.
The distillation system of application the present embodiment, first reboiler 21 is connected on the first rectifying column 11, exporting for first time of first inlet 211 of this first reboiler 21 and the first rectifying column 11 112 is communicated with, and the first gas outlet 212 is communicated with the first gas returning port 115 of the first rectifying column 11.First air inlet 213 of above-mentioned first reboiler 21 is communicated with the second upper outlet 121 of Second distillation column 12, and the first liquid outlet 214 is communicated with the second refluxing opening 124 of Second distillation column 12.Said structure can make the thermal source of the first reboiler 21 be connected on the first rectifying column 11 be provided by the overhead vapours of Second distillation column 12, can make full use of the energy in distillation system like this, thus effectively reduce system energy consumption.
In the distillation system of embodiment one, first rectifying column 11 is regular packed tower or plate column, the scope of theoretical cam curve is 80 ~ 100, the scope of tower top operation table pressure is 0.4MPa ~ 0.8MPa, the scope of tower top operating temperature is 90 DEG C ~ 115 DEG C, and capacity of returns is 6 ~ 10 with the scope of the mass flowrate ratio of inlet amount.Second distillation column 12 is regular packed tower, the scope of theoretical cam curve is 100 ~ 120, the scope of tower top operation table pressure is 0.15MPa ~ 0.55MPa, and the scope of tower top operating temperature is 70 DEG C ~ 90 DEG C, and capacity of returns is 8 ~ 12 with the scope of the mass flowrate ratio of inlet amount.First reboiler 21 is thermosyphon reboiler, and its thermal source is the overhead vapours from Second distillation column 12, and requires that the temperature range of the tower reactor of overhead vapours and the first rectifying column 11 is 10 DEG C ~ 25 DEG C.
As shown in Figure 3 and Figure 5, in the distillation system of embodiment one, distillation system also comprises the first condenser 30.Above-mentioned first condenser 30 comprises the first housing, the first fan assembly 33, first cooling tube group 34 and first liquid distributor 35.Wherein, the top that the bottom of the first housing has the first inlet section 31, first housing has the first outlet section 32.The middle part of the first housing has the first feed liquor portion.First fan assembly 33 is positioned at the first outlet section 32 place.First cooling tube group 34 to be arranged in the first housing and between the first inlet section 31 and the first outlet section 32.First liquid distributor 35 is arranged in the first housing, first liquid distributor 35 between the first outlet section 32 and the first cooling tube group 34 to make liquid be uniformly distributed in the first cooling tube group 34.In the present embodiment, first outlet section 32 is for being arranged on the air outlet of case top, first fan assembly 33 is for being arranged on the axial flow blower on above-mentioned air outlet, and the first feed liquor portion is arranged on the inlet in the first housing sidewall, and this inlet is communicated with first liquid distributor 35.When the first condenser 30 carries out work, cooling water enters first liquid distributor 35 by the first feed liquor portion, and be uniformly distributed above the first cooling tube group 34 by first liquid distributor 35, between the body of the first cooling tube group 34, form the thin water film of continuous uniform, increase the contact area of cooling water and the first cooling tube group 34.Take away the heat in the first cooling tube group 34 after above-mentioned thin water film evaporation, enhance the inside and outside heat transfer of the first cooling tube group 34, thus effectively enhance the condensation effect of condenser, reduce energy consumption.
As shown in Figure 5, in the distillation system of embodiment one, first liquid distributor 35 is trough-tray liquid distributor.Trough-tray liquid distributor belongs to overflow type liquid distributor, and this trough-tray liquid distributor comprises chassis and multiple separating tube of being arranged on above-mentioned chassis and multiple blast pipe.Wherein, chassis has liquid stream cavity, and multiple separating tube is evenly distributed on the downside on chassis, and multiple blast pipe is evenly distributed on the upside on chassis, and above-mentioned multiple separating tube and multiple blast pipe stagger and arrange.The lower end of each separating tube is provided with overflow launder, the bottom circumferential exterior surface of each separating tube is provided with the flow deflector to downward-extension, and fits between flow deflector and the edge of overflow launder.When trough-tray liquid distributor distributes to cooling water, cooling water enters the liquid stream cavity on chassis, and by separating tube uniform distribution in overflow launder.When the cooling water in overflow launder fills with, cooling water can drip downwards along the flow deflector of overflow launder edge, can realize cooling water like this and distribute more equably.
As shown in Figure 6, in the distillation system of embodiment one, the first cooling tube group 34 comprises three independent cooling coil groups arranged, and three cooling coil groups are arranged side by side in the horizontal direction in housing.Said structure can realize carrying out condensation separation to three kinds of different mixtures of materials simultaneously.Above-mentioned three cooling coil groups have the first charging aperture 341, second charging aperture 342, the 3rd charging aperture 343 and the first discharging opening 344, second discharging opening 345, the 3rd discharging opening 346 respectively, wherein, first charging aperture 341 and the first discharging opening 344 corresponding, second charging aperture 342 and the second discharging opening 345 corresponding, the 3rd charging aperture 343 and the 3rd discharging opening 346 corresponding.In the present embodiment, the first upper outlet 111 is communicated with the first refluxing opening 114, and second time outlet 122 is communicated with the first charging aperture 341, and the first upper outlet 111 is communicated with the second charging aperture 342, and the first liquid outlet 214 is communicated with the 3rd charging aperture 343.
As shown in Figure 5, in the distillation system of embodiment one, the first condenser 30 condenser also comprises the first demister 36.First demister 36 to be arranged in the first housing and between the first outlet section 32 and first liquid distributor 35.In the present embodiment, the first inlet section 31 is for being arranged on the air-inlet grille in the first lower housing portion circumferential side wall, and the first demister 36 is mesh mist eliminator.When the first condenser 30 carries out work, extraneous air is entered in the first housing from bottom by above-mentioned air-inlet grille, and bottom-up flowing, the cooling water in the first housing is evenly flowed downward by first liquid distributor 35, and both form adverse current.Air and cooling water evaporate at the first cooling tube group 34 place the steam produced and are mixed into humid air, and this humid air upwards flows into mesh mist eliminator, and under the effect of mesh mist eliminator remove portion moisture, finally enter air from the first fan assembly 33.Said structure can reduce the air entering air and carry moisture, reduces the loss of cooling water, has saved the energy.It should be noted that, the first demister 36 is not limited thereto, and in other embodiments unshowned in the drawings, the first demister 36 can be other forms of demister.
As shown in Figure 5, in the distillation system of embodiment one, the first condenser 30 also comprise liquid collector and for by the liquid pumping in liquid collector to the pumping installations at place of feed liquor portion.Liquid collector be positioned at the first cooling tube group 34 below and for holding the cooling water that the first housing upper flows down.The inlet of pumping installations is communicated with liquid collector.The liquid outlet of pumping installations is communicated with the first feed liquor portion.In the present embodiment, liquid collector is water tank, and pumping installations is water circulating pump.Above-mentioned water tank is provided with dividing plate with holes, and the cooling water flowed down from housing upper can be entered in water tank by the hole this dividing plate.Cooling water in water tank can be extracted out by water circulating pump and deliver in first liquid distributor 35, thus for the follow-up cooling to the first cooling tube group 34, cooling water inner loop can be made like this to utilize, decrease the loss of water, reduce energy ezpenditure simultaneously.Meanwhile, water tank is also provided with water supplement port and sewage draining exit, water supplement port can be controlled to moisturizing in water tank by the valve on pipeline, or waste water in water tank is drained by control of sewage disposal mouth.
As shown in Figure 5, in the distillation system of embodiment one, the first condenser 30 is divided into 5 districts from top to bottom, is respectively wind outlet area, liquid collection distributed area, cooling zone, air intake district and storage area.When operating the first condenser 30, three kinds of different mixtures of materials enter in three cooling coil groups of cooling zone cool respectively by the first charging aperture 341, second charging aperture 342, the 3rd charging apertures 343, and cooled each logistics enters follow-up equipment respectively by the first discharging opening 344, second discharging opening 345, the 3rd discharging opening 346.Cooling water is extracted out by water circulating pump and is delivered in the trough-tray liquid distributor in liquid collection distributed area from the water tank of storage area, and cooling water is uniformly distributed above cooling zone, thus on the body of cooling coil group, form the thin water film of continuous uniform, utilize the evaporation of above-mentioned thin water film to conduct heat inside and outside enhanced tube.In addition, the power of the axial flow blower of wind outlet area is relied on to form negative pressure in condenser, air is entered by the air-inlet grille in air intake district, and bottom-up flowing forms adverse current with the cooling water flowed down from liquid collection distributed area, the steam produced with cooling zone is mixed into humid air, and humid air upwards flows into after mesh mist eliminator removes part water and enters air from the exhaust outlet of axial flow blower.
As shown in Figure 3 and Figure 7, in the distillation system of embodiment one, distillation system also comprises the second condenser 40.Second condenser 40 comprises the second housing, the second fan assembly 43, second cooling tube group 44, second liquid distributor 45 and the 3rd cooling tube group 46.Wherein, the top that the bottom of the second housing has the second inlet section 41, second housing has the second outlet section 42.Second fan assembly 43 is positioned at the second outlet section 42 place.Second cooling tube group 44 is arranged in the second housing and between the second inlet section 41 and the second outlet section 42, the second cooling tube group 44 has the 4th charging aperture 441 and the 4th discharging opening 442.Second liquid distributor 45 is arranged in the second housing, second liquid distributor 45 between the second outlet section 42 and the second cooling tube group 44 to make liquid be uniformly distributed in the second cooling tube group 44.3rd cooling tube group 46 to be arranged in the second housing and between the second outlet section 42 and second liquid distributor 45,3rd cooling tube group 46 has the 5th charging aperture 461 and the 5th discharging opening 462,5th discharging opening 462 is communicated with the 4th charging aperture 441,5th charging aperture 461 is communicated with the first upper outlet 111, and the 4th discharging opening 442 is communicated with the second charging aperture 342 with the first refluxing opening 114.The main distinction of the second condenser 40 and the first condenser 30 is, the 3rd cooling tube group 46 set up by the second condenser 40.Above-mentioned 3rd cooling tube group 46 is finned cooling pipe group.Said structure can carry out precooling treatment to the material entering the second cooling tube group 44, improves condensation effect further.
As shown in Figure 7, in the distillation system of embodiment one, the second condenser 40 also comprises the second demister 47, second demister 47 and to be arranged in the second housing and between the second outlet section 42 and second liquid distributor 45.Second demister 47 is mesh mist eliminator.Second inlet section 41 is for being arranged on the air-inlet grille in the second lower housing portion circumferential side wall.When the second condenser 40 carries out work, extraneous air is entered in the second housing from bottom by above-mentioned air-inlet grille, and bottom-up flowing, the cooling water in the second housing is evenly flowed downward by second liquid distributor 45, and both form adverse current.Air and cooling water evaporate at the second cooling tube group 44 place the steam produced and are mixed into humid air, and this humid air upwards flows into mesh mist eliminator, and under the effect of mesh mist eliminator remove portion moisture.The air of remove portion moisture arrives the 3rd cooling tube group 46 place and carries out heat exchange with it, and the material realized entering the second cooling tube group 44 carries out precooling treatment.Finally, the air after heat exchange enters air from the second fan assembly 43.Said structure can reduce the air entering air and carry moisture, reduces the loss of cooling water, has saved the energy.It should be noted that, the second demister 47 is not limited thereto, and in other embodiments unshowned in the drawings, the second demister 47 can be other forms of demister.
As shown in Figure 7, in the distillation system of embodiment one, second condenser 40 also comprises gas-liquid separation device 48, and the import of gas-liquid separation device 48 is communicated with the 4th discharging opening 442, and the liquid outlet of gas-liquid separation device 48 is communicated with the second charging aperture 342 with the first refluxing opening 114.In the present embodiment, gas-liquid separation device 48 is knockout drum.Said structure can carry out further gas-liquid separation to the material that the 4th discharging opening 442 flows out.
As shown in Figure 7, in the distillation system of embodiment one, the second condenser 40 is divided into 7 districts from top to bottom, is respectively wind outlet area, pre-cooling zone, liquid collection distributed area, cooling zone, air intake district, storage area and gas-liquid separation zone.When operating the second condenser 40, the finned cooling pipe group that first steam (as the saturated vapor that rectifying column tower top produces) that preposition equipment produces enter pre-cooling zone carries out heat exchange precooling, steam after precooling enters cooling coil group total condensation and the cooling of cooling zone again, logistics after condensing cooling enters gas-liquid separation zone, and enters knockout drum.In knockout drum after gas-liquid separation, fixed gas is discharged by the gas outlet of knockout drum, and condensate liquid enters follow-up equipment by liquid outlet.Cooling water is extracted out by water circulating pump and is delivered in the trough-tray liquid distributor in liquid collection distributed area from the water tank of storage area, and cooling water is uniformly distributed above cooling zone, thus on the body of cooling coil group, form the thin water film of continuous uniform, utilize the evaporation of above-mentioned thin water film to conduct heat inside and outside enhanced tube.In addition, the power of the axial flow blower of wind outlet area is relied on to form negative pressure in condenser, air is entered by the air-inlet grille in air intake district, and bottom-up flowing forms adverse current with the cooling water flowed down from liquid collection distributed area, the steam produced with cooling zone is mixed into humid air, humid air upwards flows into after mesh mist eliminator removes part water, arrives the 3rd cooling tube group 46 place and also carries out heat exchange with it, finally enter air from the exhaust outlet of axial flow blower.
As shown in Figure 3, in the distillation system of embodiment one, first liquid outlet 214 of the first reboiler 21 and be provided with surge tank between the second refluxing opening 124 of Second distillation column 12 and the 3rd charging aperture 343 of the first condenser 30, the first upper outlet 111 of the first rectifying column 11 is same with between the first refluxing opening 114 and the second charging aperture 342 of the first condenser 30 is provided with surge tank.
As shown in Figure 3, in the distillation system of embodiment one, the workflow of distillation system is:
That comes from preceding processes treats that refining purification material 500 enters from middle and lower part first import 113 of the first rectifying column 11, the overhead vapours 501 of the first rectifying column 11 enters the second condenser 40 and carries out condensing cooling, two-way is divided into after cooled condensate liquid 502 enters surge tank, one tunnel enters as the top of phegma 503 from the first rectifying column 11, and another road is discharged as low-boiling-point substance 504.The tower reactor liquid 505 of the first rectifying column 11 enters from the second import 123 of Second distillation column 12 middle and upper part.The overhead vapours 506 of Second distillation column 12 enters the first reboiler 21 shell side for heating the tower reactor liquid of the first rectifying column 11, condensed overhead vapours 507 enters surge tank, the condensate liquid 508 of discharging from surge tank is divided into two-way, one tunnel enters as the top of phegma 509 from Second distillation column 12, and another road is discharged as low-boiling-point substance 510.The product 511 of discharging from Second distillation column 12 tower reactor, above-mentioned low-boiling-point substance 504 and above-mentioned low-boiling-point substance 510 enter from three cooling coil groups of the first condenser 30 respectively and cool, and cooled low-boiling-point substance 512, product 513 and low-boiling-point substance 514 enter subsequent handling.Wherein, treat that refining purification material 500 can be dichlorosilane, trichlorosilane or silicon tetrachloride.
As shown in Figure 4, the distillation system of embodiment two is the second flow process (namely the overhead product of upstream rectifying column is as the raw material of downstream rectifying column) of refining purification for polysilicon, and this distillation system comprises the first rectifying column 11, Second distillation column 12 and the second reboiler 22.Wherein, the first rectifying column 11 has the first import 113 and the first refluxing opening 114 that the first upper outlet exports 112 for 111, first time and is arranged between the first upper outlet 111 and first time outlet 112.The second import 123, second refluxing opening 124 and the second gas returning port 125 that Second distillation column 12 has 121, the second time outlet 122 of the second upper outlet and is arranged between the second upper outlet 121 and second time outlet 122.Second reboiler 22 has the second inlet 221, second gas outlet 222, second air inlet 223 and the second liquid outlet 224, second inlet 221 and exports 122 second time and be communicated with, and the second gas outlet 222 is communicated with the second gas returning port 125.Second air inlet 223 is communicated with the first upper outlet 111, and the second liquid outlet 224 is communicated with the second import 123 with the first refluxing opening 114.In above-mentioned the second flow process, first the overhead product of the first rectifying column 11 carries out heat exchange as the thermal source of the second reboiler 22 on Second distillation column 12, the raw material being re-used as Second distillation column 12 enters in Second distillation column 12 by the second liquid outlet 224, second import 123, the energy in distillation system can be made full use of like this, thus effectively reduce system energy consumption.
In the distillation system of embodiment two, first rectifying column 11 is regular packed tower or plate column, the scope of theoretical cam curve is 80 ~ 100, the scope of tower top operation table pressure is 0.4MPa ~ 0.8MPa, the scope of tower top operating temperature is 90 DEG C ~ 115 DEG C, and capacity of returns is 6 ~ 10 with the scope of the mass flowrate ratio of inlet amount.Second distillation column 12 is regular packed tower, the scope of theoretical cam curve is 100 ~ 120, the scope of tower top operation table pressure is 0.15MPa ~ 0.55MPa, and the scope of tower top operating temperature is 70 DEG C ~ 90 DEG C, and capacity of returns is 8 ~ 12 with the scope of the mass flowrate ratio of inlet amount.Second reboiler 22 is thermosyphon reboiler, and its thermal source is the overhead vapours from the first rectifying column 11, and requires that the temperature range of the tower reactor of overhead vapours and Second distillation column 12 is 10 DEG C ~ 25 DEG C.
As shown in Figure 4, in the distillation system of embodiment two, distillation system also comprises the first condenser 30.First condenser 30 of the present embodiment is with the main distinction of the first condenser 30 of embodiment one, second upper outlet 121 is communicated with the second refluxing opening 124, second time outlet 122 is communicated with the first charging aperture 341, and the second upper outlet 121 is communicated with the 3rd charging aperture 343, first time outlet 112 is communicated with the second charging aperture 342.Other structures of above-mentioned first condenser 30 and operation principle are identical with embodiment one, do not repeat them here.
As shown in Figure 4, in the distillation system of embodiment two, distillation system also comprises the second condenser 40.Second condenser 40 of the present embodiment is with the main distinction of the second condenser 40 of embodiment one, and the 5th charging aperture 461 is communicated with the second upper outlet 121, and the 4th discharging opening 442 is communicated with the 3rd charging aperture 343 with the second refluxing opening 124.Above-mentioned second condenser 40 also comprises gas-liquid separation device 48, and the import of gas-liquid separation device 48 is communicated with the 4th discharging opening 442, and the liquid outlet of gas-liquid separation device 48 is communicated with the 3rd charging aperture 343 with the second refluxing opening 124.Other structures of above-mentioned second condenser 40 and operation principle are identical with embodiment one, do not repeat them here.
As shown in Figure 4, in the distillation system of embodiment two, second liquid outlet 224 of the second reboiler 22 and be also provided with surge tank between the first refluxing opening 114 of the first rectifying column 11 and the second import 123 of Second distillation column 12, the second upper outlet 121 of Second distillation column 12 is same with between the second refluxing opening 124 and the 3rd charging aperture 343 of the first condenser 30 is provided with surge tank.
As shown in Figure 4, in the distillation system of embodiment two, the workflow of distillation system is:
That comes from preceding processes treats that refining purification material 600 enters from middle and lower part first import 113 of the first rectifying column 11, the overhead vapours 601 of the first rectifying column 11 enters the second reboiler 22 shell side for heating the tower reactor liquid of Second distillation column 12, condensed overhead vapours 602 enters surge tank, the condensate liquid 603 of discharging from surge tank is divided into two-way, one tunnel enters as the top of phegma 604 from the first rectifying column 11, and another road condensate liquid 605 enters from the second import 123 of Second distillation column 12 middle and upper part.The overhead vapours 606 of Second distillation column 12 enters the second condenser 40 and carries out condensing cooling, and be divided into two-way after cooled condensate liquid 607 enters surge tank, a road enters as the top of phegma 608 from Second distillation column 12, and another road is discharged as low-boiling-point substance 609.High-boiling components 611 from the first rectifying column 11 tower reactor discharge, the product 610 from the discharge of Second distillation column 12 tower reactor and above-mentioned low-boiling-point substance 609 enter from three cooling coil groups of the first condenser 30 respectively and cool, and cooled low-boiling-point substance 612, product 613 and high-boiling components 614 enter subsequent handling.Wherein, treat that refining purification material 600 can be dichlorosilane, trichlorosilane or silicon tetrachloride.
As can be seen from the above description, the above embodiments of the present invention achieve following technique effect:
The distillation system of the application is applied to the refining purification of polysilicon, the thermal source of the reboiler be connected in multiple rectifying column is provided by the overhead product (such as overhead vapours) of another in multiple rectifying column, the energy in distillation system can be made full use of like this, thus effectively reduce system energy consumption.
In addition, the first condenser after improvement and the second condenser are applied in distillation system, decrease the consumption of water, decrease energy consumption, and carry out condensation and cooling by above-mentioned first condenser overhead vapours, high-boiling components, product and low-boiling-point substance, compared with existing distillation system, reduce energy ezpenditure more than 50%.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a distillation system, is characterized in that, comprising:
Multiple rectifying column, has upper outlet, lower outlet and the refluxing opening that is arranged between described upper outlet, described lower outlet and gas returning port;
Reboiler, there is inlet, gas outlet, air inlet and liquid outlet, the described lower outlet of one in described inlet and multiple described rectifying column, described gas outlet is communicated with the described gas returning port of this rectifying column, described air inlet is communicated with another the described upper outlet in multiple described rectifying column, and described liquid outlet is communicated with the described refluxing opening of this rectifying column.
2. distillation system according to claim 1, is characterized in that, described rectifying column comprises:
First rectifying column (11), has the first upper outlet (111), first time outlet (112) and is arranged on described first upper outlet (111) and describedly exports the first import (113) between (112), the first refluxing opening (114) and the first gas returning port (115) for first time;
Second distillation column (12), has the second upper outlet (121), second time outlet (122) and is arranged on described second upper outlet (121) and describedly exports the second import (123) between (122) and the second refluxing opening (124) for second time;
Described reboiler comprises:
First reboiler (21), there is the first inlet (211), the first gas outlet (212), the first air inlet (213) and the first liquid outlet (214), described first inlet (211) with export (112) described first time and be communicated with, described first gas outlet (212) is communicated with described first gas returning port (115);
Wherein, described first air inlet (213) is communicated with described second upper outlet (121), described first liquid outlet (214) is communicated with described second refluxing opening (124), and described first time outlet (112) is communicated with described second import (123).
3. distillation system according to claim 1, is characterized in that, described rectifying column comprises:
First rectifying column (11), has the first upper outlet (111), first time outlet (112) and is arranged on described first upper outlet (111) and describedly exports the first import (113) between (112) and the first refluxing opening (114) for first time;
Second distillation column (12), has the second upper outlet (121), second time outlet (122) and is arranged on described second upper outlet (121) and describedly exports the second import (123) between (122), the second refluxing opening (124) and the second gas returning port (125) for second time;
Described reboiler comprises:
Second reboiler (22), there is the second inlet (221), the second gas outlet (222), the second air inlet (223) and the second liquid outlet (224), described second inlet (221) with export (122) described second time and be communicated with, described second gas outlet (222) is communicated with described second gas returning port (125);
Wherein, described second air inlet (223) is communicated with described first upper outlet (111), and described second liquid outlet (224) is communicated with described second import (123) with described first refluxing opening (114).
4. distillation system according to claim 2, is characterized in that, described distillation system also comprises the first condenser (30), and described first condenser (30) comprising:
First housing, the bottom of described first housing has the first inlet section (31), and the top of described first housing has the first outlet section (32);
First fan assembly (33), is positioned at described first outlet section (32) place;
First cooling tube group (34), to be arranged in described first housing and to be positioned between described first inlet section (31) and described first outlet section (32), described first cooling tube group (34) has the first charging aperture (341), the second charging aperture (342), the 3rd charging aperture (343) and the first discharging opening (344), the second discharging opening (345), the 3rd discharging opening (346), and described second time outlet (122) is communicated with described first charging aperture (341);
First liquid distributor (35), be arranged in described first housing, described first liquid distributor (35) is positioned between described first outlet section (32) and described first cooling tube group (34) to make liquid be uniformly distributed in described first cooling tube group (34).
5. distillation system according to claim 4, it is characterized in that, described first upper outlet (111) is communicated with described first refluxing opening (114), and described first upper outlet (111) is communicated with described second charging aperture (342), described first liquid outlet (214) is communicated with described 3rd charging aperture (343).
6. distillation system according to claim 5, is characterized in that, described distillation system also comprises the second condenser (40), and described second condenser (40) comprising:
Second housing, the bottom of described second housing has the second inlet section (41), and the top of described second housing has the second outlet section (42);
Second fan assembly (43), is positioned at described second outlet section (42) place;
Second cooling tube group (44), being arranged in described second housing and being positioned between described second inlet section (41) and described second outlet section (42), described second cooling tube group (44) has the 4th charging aperture (441) and the 4th discharging opening (442);
Second liquid distributor (45), be arranged in described second housing, described second liquid distributor (45) is positioned between described second outlet section (42) and described second cooling tube group (44) to make liquid be uniformly distributed in described second cooling tube group (44);
3rd cooling tube group (46), described 3rd cooling tube group (46) to be arranged in described second housing and to be positioned between described second outlet section (42) and described second liquid distributor (45), described 3rd cooling tube group (46) has the 5th charging aperture (461) and the 5th discharging opening (462), described 5th discharging opening (462) is communicated with described 4th charging aperture (441), described 5th charging aperture (461) is communicated with described first upper outlet (111), described 4th discharging opening (442) is communicated with described second charging aperture (342) with described first refluxing opening (114).
7. distillation system according to claim 3, is characterized in that, described distillation system also comprises the first condenser (30), and described first condenser (30) comprising:
First housing, the bottom of described first housing has the first inlet section (31), and the top of described first housing has the first outlet section (32);
First fan assembly (33), is positioned at described first outlet section (32) place;
First cooling tube group (34), to be arranged in described first housing and to be positioned between described first inlet section (31) and described first outlet section (32), described first cooling tube group (34) has the first charging aperture (341), the second charging aperture (342), the 3rd charging aperture (343) and the first discharging opening (344), the second discharging opening (345), the 3rd discharging opening (346), and described second time outlet (122) is communicated with described first charging aperture (341);
First liquid distributor (35), be arranged in described first housing, described first liquid distributor (35) is positioned between described first outlet section (32) and described first cooling tube group (34) to make liquid be uniformly distributed in described first cooling tube group (34).
8. distillation system according to claim 7, it is characterized in that, described second upper outlet (121) is communicated with described second refluxing opening (124), and described second upper outlet (121) is communicated with described 3rd charging aperture (343), described first time outlet (112) is communicated with described second charging aperture (342).
9. distillation system according to claim 8, is characterized in that, described distillation system also comprises the second condenser (40), and described second condenser (40) comprising:
Second housing, the bottom of described second housing has the second inlet section (41), and the top of described second housing has the second outlet section (42);
Second fan assembly (43), is positioned at described second outlet section (42) place;
Second cooling tube group (44), being arranged in described second housing and being positioned between described second inlet section (41) and described second outlet section (42), described second cooling tube group (44) has the 4th charging aperture (441) and the 4th discharging opening (442);
Second liquid distributor (45), be arranged in described second housing, described second liquid distributor (45) is positioned between described second outlet section (42) and described second cooling tube group (44) to make liquid be uniformly distributed in described second cooling tube group (44);
3rd cooling tube group (46), described 3rd cooling tube group (46) to be arranged in described second housing and to be positioned between described second outlet section (42) and described second liquid distributor (45), described 3rd cooling tube group (46) has the 5th charging aperture (461) and the 5th discharging opening (462), described 5th discharging opening (462) is communicated with described 4th charging aperture (441), described 5th charging aperture (461) is communicated with described second upper outlet (121), described 4th discharging opening (442) is communicated with described 3rd charging aperture (343) with described second refluxing opening (124).
10. the distillation system according to claim 4 or 7, it is characterized in that, described first condenser (30) also comprises the first demister (36), and described first demister (36) to be arranged in described first housing and to be positioned between described first outlet section (32) and described first liquid distributor (35).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610031853.0A CN105413221A (en) | 2016-01-18 | 2016-01-18 | Rectifying system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610031853.0A CN105413221A (en) | 2016-01-18 | 2016-01-18 | Rectifying system |
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| CN105413221A true CN105413221A (en) | 2016-03-23 |
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| US20040182752A1 (en) * | 2003-03-20 | 2004-09-23 | Rian Reyneke | Distillation sequence for the purification and recovery of hydrocarbons |
| CN203754435U (en) * | 2014-03-31 | 2014-08-06 | 中国恩菲工程技术有限公司 | System of purifying chlorosilane by use of differential pressure thermal coupling of uncorrelated towers |
| CN105066734A (en) * | 2015-07-16 | 2015-11-18 | 东华大学 | Combined cooling tower |
| CN205461092U (en) * | 2016-01-18 | 2016-08-17 | 中国恩菲工程技术有限公司 | Rectification system |
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2016
- 2016-01-18 CN CN201610031853.0A patent/CN105413221A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040182752A1 (en) * | 2003-03-20 | 2004-09-23 | Rian Reyneke | Distillation sequence for the purification and recovery of hydrocarbons |
| CN203754435U (en) * | 2014-03-31 | 2014-08-06 | 中国恩菲工程技术有限公司 | System of purifying chlorosilane by use of differential pressure thermal coupling of uncorrelated towers |
| CN105066734A (en) * | 2015-07-16 | 2015-11-18 | 东华大学 | Combined cooling tower |
| CN205461092U (en) * | 2016-01-18 | 2016-08-17 | 中国恩菲工程技术有限公司 | Rectification system |
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