Device and method for trapping gas-phase entrained fine colloidal particles in rubber solution elutriation method condensation process
阅读说明：本技术 一种橡胶溶液水析法凝聚过程中捕集气相夹带细胶粒的装置和方法 (Device and method for trapping gas-phase entrained fine colloidal particles in rubber solution elutriation method condensation process ) 是由 王颂杨 于 2019-09-30 设计创作，主要内容包括：本发明提供了一种橡胶溶液水析法凝聚过程中捕集气相夹带细胶粒的装置和方法,采用串联的2个或3个的凝聚釜,在所述凝聚釜内将橡胶聚合物溶液和热水的混合物与蒸汽进行接触,使橡胶聚合物溶液中的溶剂汽化脱除；通过增加捕集气相夹带细胶粒的装置且搅拌器电机轴上设有热水接收器；所述捕集气相夹带细胶粒的装置安装在搅拌器电机轴上部且与搅拌器电机轴上的热水接收器连通,其转动频次和搅拌器相同。采用本发明提供的凝聚工艺进行聚合物溶液的凝聚时,可以有效减少凝聚釜顶部溶剂气体、水蒸气中细胶粒的夹带,防止后续的冷凝设备的堵塞,使凝聚工艺长周期运行,并提高分离效果、降低单体的消耗。(The invention provides a device and a method for trapping gas-phase entrained fine colloidal particles in a rubber solution elutriation process coagulation process, which adopt 2 or 3 coagulation kettles connected in series, and contact a mixture of a rubber polymer solution and hot water with steam in the coagulation kettles to vaporize and remove a solvent in the rubber polymer solution; a hot water receiver is arranged on a motor shaft of the stirrer by adding a device for trapping gas-phase entrained fine colloidal particles; the device for trapping the gas phase carrying the fine colloidal particles is arranged on the upper part of a stirrer motor shaft and is communicated with a hot water receiver on the stirrer motor shaft, and the rotating frequency of the device is the same as that of the stirrer. When the coagulation process provided by the invention is used for coagulation of polymer solution, entrainment of fine colloidal particles in solvent gas and water vapor at the top of a coagulation kettle can be effectively reduced, subsequent blockage of condensation equipment is prevented, the coagulation process is operated for a long period, the separation effect is improved, and the consumption of monomers is reduced.)
1. The utility model provides a device of tiny micelle is carried in entrapment gaseous phase among rubber solution elutriation method coacervation process which characterized in that includes:
the first condensation kettle is provided with a first feeding hole and a steam inlet, and the first feeding hole is connected with the feeding unit; a first discharge hole is formed in the bottom of the first condensation kettle; the top of the first condensation kettle is provided with a first steam outlet pipe and a steam condenser which are used for condensing and recovering steam in the first condensation kettle;
the second coagulation kettle is provided with a second feeding hole, and the second feeding hole is connected with the first discharging hole of the first coagulation kettle through a first conveying pipe; the bottom of the second condensation kettle is provided with a second discharge hole, and the bottom of the second condensation kettle is also connected with a low-pressure steam pipe; the top of the first condensation kettle is provided with a first steam outlet pipe which is connected with a steam inlet of the first condensation kettle;
the tops of the first coagulation kettle and the second coagulation kettle are both connected with a hot water pipe, the insides of the first coagulation kettle and the second coagulation kettle are both provided with a stirrer and a device for catching gas-phase entrained fine colloidal particles, and a hot water receiver is arranged on a motor shaft of the stirrer; the agitator is single-layer or multilayer, the device of entrapment gaseous phase smuggleing tiny micelle secretly is installed on agitator motor shaft upper portion and with the hot water receiver intercommunication on the agitator motor shaft.
2. The apparatus for trapping gas-phase entrained fine particles in the process of rubber solution hydrometallurgical coagulation as set forth in claim 1, further comprising a third coagulation vessel; the third coagulation kettle is provided with a third feed inlet, and the third feed inlet is connected with a second discharge hole of the second coagulation kettle through a second conveying pipe; a third discharge hole is formed in the bottom of the third condensation kettle and is connected with a feed inlet of the post-treatment process section; the bottom of the third condensation kettle is also connected with a low-pressure steam pipe; the top is equipped with the third steam outlet pipe, and the third steam outlet pipe is connected with the steam inlet of first condensation cauldron, be equipped with the steam jet ejector on the third steam outlet pipe.
3. The apparatus for trapping gas-phase entrained fine particles in the process of rubber solution hydrometallurgy according to claim 1, wherein said apparatus for trapping gas-phase entrained fine particles is a disk; the diameter of the disc is 0.05-0.6D, wherein D is the diameter of the condensation kettle; punctiform holes or linear holes are uniformly distributed on the disc, and baffles are arranged around the holes.
4. The apparatus for trapping gas-phase entrained fine particles in the process of rubber solution hydrometallurgical coagulation according to claim 1, wherein said apparatus for trapping gas-phase entrained fine particles comprises a plurality of horizontally disposed tanks uniformly distributed in a radial manner and communicating with a hot water receiver; the depth of the groove is 20 mm-200 mm, the tops of the side plates at two sides of the groove are in a sawtooth shape, the length of the groove is 0.05-0.4D, and D is the diameter of the condensation kettle.
5. The apparatus for trapping gas-phase entrained fine particles in the process of rubber solution elutriation coagulation as in claim 1, wherein the distance between the apparatus for trapping gas-phase entrained fine particles mounted on the shaft of the stirring motor and the stirrer inside the first coagulation vessel and the second coagulation vessel is 0.2-0.9L, wherein L is the length of the shaft of the stirring motor.
6. The method for trapping gas-phase entrained fine particles in the process of rubber solution hydrometallurgical coagulation according to claim 1, wherein said hot water receiver is an annular trough; the width of the annular groove is 0.01-0.3D, and the depth of the groove is 30-300 mm.
7. A method for trapping gas-phase entrained fine particles in a rubber solution elutriation process of coagulation by using the device of claim 2, which is characterized by comprising the following steps:
(1) mixing the rubber polymer solution and a strand of hot water in a mixer, and then conveying the mixture into a first condensation kettle, wherein steam is added from the bottom of the first condensation kettle; the other strand of hot water is conveyed to a hot water receiver from a hot water pipe at the top of the first coagulation kettle, and the hot water is dispersed into liquid drops to be sprayed into the kettle through a device for trapping gas-phase entrained fine colloidal particles; discharging gas phase obtained in the first condensation kettle from a first steam outlet pipe at the top of the kettle, and recovering the solvent and hot water through subsequent condensation; the obtained liquid phase is first colloidal particle water and is discharged from a first discharge hole at the bottom of the kettle;
(2) conveying the first colloidal particle water obtained in the step (1) into a second coagulation kettle, adding low-pressure steam from the bottom of the second coagulation kettle, conveying hot water from a hot water pipe at the top of the second coagulation kettle to a hot water receiver, and dispersing the hot water into liquid drops to be sprayed into the kettle by a device for trapping gas-phase entrained fine colloidal particles; discharging gas phase obtained in the second condensation kettle from a second steam outlet pipe at the top of the kettle, and returning the gas phase to the first condensation kettle in the step (1); the obtained liquid phase is second colloidal particle water and is discharged from a second discharge hole at the bottom of the kettle;
(3) conveying the second colloidal particle water obtained in the step (2) to a third coagulation kettle, wherein the operating pressure of the third coagulation kettle is lower than that of the second coagulation kettle, and the operating pressure of the third coagulation kettle is controlled by adjusting the steam flow of a steam ejector arranged on a third steam outlet pipe; discharging the gas phase obtained in the third condensation kettle from a third steam outlet pipe at the top of the kettle, and returning the gas phase to the first condensation kettle in the step (1); the obtained liquid phase is third colloidal particle water and is discharged to the colloidal particle post-treatment unit from a third discharge hole at the bottom of the kettle.
8. The method for trapping gas-phase entrained fine particles in the rubber solution elutriation process coagulation process as claimed in claim 1, wherein the mass concentration of the rubber polymer solution is 5-15%; the rubber polymer in the rubber polymer solution is a conjugated diene homopolymer or a copolymer of conjugated diene and vinyl aromatic hydrocarbon; the conjugated diene homopolymer is polyisoprene or polybutadiene; the copolymer of the conjugated diene and the vinyl aromatic hydrocarbon is a copolymer of isoprene and alpha-methylstyrene or a copolymer of butadiene and alpha-methylstyrene; the solvent in the rubber polymer solution is selected from alkanes, cycloalkanes and/or aromatics.
9. The method for trapping gas-phase entrained fine particles in the rubber solution elutriation process coagulation process as claimed in claim 1, wherein the mass ratio of hot water entering the first coagulation kettle to the rubber polymer solution in unit time is 2: 1-14: 1; the mass flow ratio of the mixture of the rubber polymer solution and the hot water entering the first coagulation kettle to the low-pressure steam entering the second coagulation kettle is 8: 1-80: 1; the temperature of the hot water is 50-95 ℃.
10. The method for trapping gas-phase entrained fine particles in the process of rubber solution elutriation condensation as claimed in claim 1, wherein the operating pressure of the first condensation kettle is 0.001-0.05 MPa gauge pressure and the temperature is 60-92 ℃; the operating pressure of the second condensation kettle is 0.05-0.1 MPa of gauge pressure, and the temperature is 92-110 ℃; the operating pressure of the third condensation kettle is-0.002-0.005 MPa of gauge pressure, and the temperature is 80-100 ℃.
Technical Field
The invention relates to the field of rubber polymers, in particular to a device and a method for trapping gas-phase entrained fine colloidal particles in a rubber solution elutriation method coagulation process.
Technical Field
Some common rubber-like polymer production processes generally include polymerization, coagulation, post-treatment, and other processes. In the polymerization unit, one or more monomers are subjected to polymerization reaction with a catalyst in a solvent to obtain a polymer solution, the polymer solution enters a condensation unit, the solvent in the polymer is subjected to flash evaporation separation by using steam and hot water through a elutriation method, and the obtained water-containing polymer is subjected to post-treatment processes such as drying and the like to obtain a polymer product. The process of the liqueur coacervation is that under the mechanical agitation, colloidal particles are dispersed in hot water in a liquid drop shape, steam is directly introduced into a kettle, latent heat is released by partial steam condensation to heat the hot water, and heat is transferred to the colloidal particles through the hot water. At the moment, the solvent, monomer and other heated parts in the liquid drop-shaped glue solution are gasified, and the solvent gas is carried out of the condensation kettle by water vapor according to a certain proportion, so that the aim of removing the solvent is fulfilled. The rubber after the solvent is evaporated is precipitated in a granular form and dispersed in water. The condensation process in the prior art generally adopts double-kettle condensation or three-kettle condensation, and the multi-kettle condensation operation can improve the solvent removal effect.
At present, most of domestic synthetic rubber devices adopt a three-kettle condensation process by a elutriation method, in the process of condensation of a first kettle, colloidal particles are separated from a solvent along with continuous mass transfer and heat transfer of hot water and a glue solution, evaporated solvent gas and vapor can carry fine colloidal particles out of the top of the condensation kettle and enter a subsequent condensation separation system, and then equipment is blocked, the heat exchange and separation effects are influenced, and finally the energy consumption and the material consumption of the device are influenced. The method for separating entrained particles used by a condensation first kettle in most of the prior devices is to convey hot water separated from colloidal particles in the post-treatment process to an annular tubular spraying device with micropores arranged at the top end in the kettle by a pump, the hot water is sprayed out from the micropores by the pressure provided by the pump to form liquid mist to intercept the particles from a gas phase and return the particles to the kettle along with liquid drops. And the tubular spraying device is arranged in the kettle, so that the cleaning is difficult, and the long-period operation of the device is influenced. Therefore, developing an effective device for trapping gas-phase entrained fine colloidal particles to further reduce energy consumption and material consumption, reduce three-waste emission and reduce cost becomes a hotspot problem of research in the field.
Disclosure of Invention
The invention provides a device and a method for trapping gas-phase entrained fine colloidal particles in a rubber solution elutriation process coagulation process, aiming at the problems in the prior art, in the coagulation process, a rubber polymer solution and hot water are separated in a coagulation kettle through an elutriation process to realize the removal of a solvent in a colloidal solution, and through the special design of a spray device of the coagulation kettle, namely the device for trapping the gas-phase entrained fine colloidal particles in the claim, the coagulation process can run for a long period, the entrainment of the fine colloidal particles in solvent gas and water vapor at the top of the coagulation kettle can be effectively reduced, the subsequent blockage of condensation equipment is prevented, the separation effect is improved, and the consumption of monomers is reduced.
The invention discloses a device for trapping gas-phase entrained fine colloidal particles in a rubber solution elutriation method coagulation process, which comprises the following steps:
the side surface of the first condensation kettle is provided with a first feeding hole and a steam inlet, and the first feeding hole is connected with the feeding unit; the bottom is provided with a first discharge hole; the top of the condensation kettle is provided with a first steam outlet pipe and a steam condenser which are used for condensing and recovering steam in the first condensation kettle;
a second feeding hole is formed in the side surface of the second coagulation kettle and is connected with a first discharging hole of the first coagulation kettle through a first conveying pipe, and a first kettle colloidal particle water pump is arranged on the first conveying pipe; the bottom of the steam pipe is provided with a second discharge hole and is also connected with a low-pressure steam pipe; the top of the first condensation kettle is provided with a first steam outlet pipe which is connected with a steam inlet of the first condensation kettle;
the tops of the first coagulation kettle and the second coagulation kettle are both connected with a hot water pipe, the insides of the first coagulation kettle and the second coagulation kettle are both provided with a stirrer and a device for catching gas-phase entrained fine colloidal particles, and a hot water receiver is arranged on a motor shaft of the stirrer; the agitator is single-layer or multilayer, the device of entrapment gaseous phase smuggleing tiny micelle secretly is installed on agitator motor shaft upper portion and is linked together with the hot water receiver on the agitator motor shaft, and its frequency of rotation is the same with the agitator.
The preferable scheme of the invention also comprises a third condensation kettle; a third feeding port is arranged on the side surface of the third coagulation kettle and is connected with a second discharging port of the second coagulation kettle through a second conveying pipe, and a second kettle colloidal particle water pump is arranged on the second conveying pipe; the bottom of the first discharge hole is provided with a first discharge hole which is connected with a feed hole of the post-treatment process section; the bottom is also connected with a low-pressure steam pipe; and a third steam outlet pipe is arranged at the top of the condensation kettle and connected with a steam inlet of the first condensation kettle, and a steam ejector is arranged on the third steam outlet pipe.
As a preferable scheme of the invention, the device for trapping the gas-phase entrained fine colloidal particles is a disc; the diameter of the disc is 0.05-0.6D, preferably 0.25-0.5D, wherein D is the diameter of the condensation kettle; punctiform holes or linear holes are uniformly distributed on the disc, baffles are arranged around the holes, and the height of each baffle is 10-100 mm, preferably 20-50 mm.
As a preferable scheme of the invention, the device for trapping the gas-phase entrained fine colloidal particles is a plurality of horizontally arranged grooves which are uniformly distributed in an emission shape and are communicated with a hot water receiver; the depth of the groove is 20 mm-200 mm, preferably 50-100 mm, the tops of the side plates at two sides of the groove are preferably in a sawtooth shape, the length of the groove plate is 0.05-0.4D, preferably 0.1-0.3D, and D is the diameter of the condensation kettle.
In a preferred embodiment of the present invention, the distance between the stirrer and the device for trapping gas-phase entrained fine colloidal particles, which is mounted on the shaft of the stirring motor, inside the first coagulation reactor and the second coagulation reactor is 0.2 to 0.9L, preferably 0.5 to 0.8L, where L is the length of the shaft of the stirring motor.
As a preferable aspect of the present invention, the hot water receiver is an annular groove; the width of the annular groove is 0.01-0.3D, preferably 0.05-0.2D; the depth of the groove is 30mm to 300mm, preferably 100mm to 200 mm.
The invention also discloses a method for trapping gas-phase entrained fine colloidal particles in the process of rubber solution elutriation condensation, which comprises the following steps:
(1) mixing the rubber polymer solution and a strand of hot water in a mixer, and then conveying the mixture into a first condensation kettle, wherein steam is added from the bottom of the first condensation kettle; the other strand of hot water is conveyed to a hot water receiver from a hot water pipe at the top of the first coagulation kettle, and the hot water is dispersed into liquid drops to be sprayed into the kettle through a device for trapping gas-phase entrained fine colloidal particles; discharging gas phase obtained in the first condensation kettle from a first steam outlet pipe at the top of the kettle, and recovering the solvent and hot water through subsequent condensation; the obtained liquid phase is first colloidal particle water and is discharged from a first discharge hole at the bottom of the kettle;
(2) conveying the first colloidal particle water obtained in the step (1) into a second coagulation kettle, adding low-pressure steam from the bottom of the second coagulation kettle, conveying hot water from a hot water pipe at the top of the second coagulation kettle to a hot water receiver, and dispersing the hot water into liquid drops to be sprayed into the kettle by a device for trapping gas-phase entrained fine colloidal particles; discharging gas phase obtained in the second condensation kettle from a second steam outlet pipe at the top of the kettle, and returning the gas phase to the first condensation kettle in the step (1); the obtained liquid phase is second colloidal particle water and is discharged from a second discharge hole at the bottom of the kettle;
(3) conveying the second colloidal particle water obtained in the step (2) to a third coagulation kettle, wherein the operating pressure of the third coagulation kettle is lower than that of the second coagulation kettle, and the operating pressure of the third coagulation kettle is controlled by adjusting the steam flow of a steam ejector arranged on a third steam outlet pipe; discharging the gas phase obtained in the third condensation kettle from a third steam outlet pipe at the top of the kettle, and returning the gas phase to the first condensation kettle in the step (1); the obtained liquid phase is third colloidal particle water and is discharged to the colloidal particle post-treatment unit from a third discharge hole at the bottom of the kettle.
In a preferable embodiment of the present invention, the mass concentration of the rubber polymer solution is 5 to 15%; the rubber polymer in the rubber polymer solution is a conjugated diene homopolymer or a copolymer of conjugated diene and vinyl aromatic hydrocarbon; the conjugated diene homopolymer is polyisoprene or polybutadiene; the copolymer of the conjugated diene and the vinyl aromatic hydrocarbon is a copolymer of isoprene and alpha-methylstyrene or a copolymer of butadiene and alpha-methylstyrene; the solvent in the rubber polymer solution is selected from alkanes, cycloalkanes and/or aromatics.
According to the preferable scheme of the invention, the mass ratio of the hot water entering the first coagulation kettle to the rubber polymer solution is 2-14: 1 in unit time; the mass flow ratio of the mixture of the rubber polymer solution and the hot water entering the first coagulation kettle to the low-pressure steam entering the second coagulation kettle is 8-80: 1, and under the condition that the ratio is met, the mass flow of the mixture and the mass flow of the second steam can be properly selected according to different process scales, for example, the mass flow of the mixture is 10000-150000 kg/h, and the mass flow of the second steam is 1000-8300 kg/h; the temperature of the hot water is 50-95 ℃, and preferably 70-95 ℃.
In a preferred embodiment of the present invention, the operating pressure of the first coagulation-flocculation kettle F1 is 0.001 to 0.05MPa, preferably 0.003 to 0.03MPa, gauge pressure, and temperature is 60 to 92 ℃, preferably 83 to 92 ℃; the glue solution and hot water enter the middle-lower part of the condensation first kettle, the glue solution is dispersed in the hot water in a liquid drop shape under the action of stirring, the heat in the kettle is transferred to the colloidal particles through the hot water under the action of water vapor, the solvent and the like in the liquid drop-shaped glue solution are heated and gasified, and are taken out of the top of the condensation kettle according to a certain proportion by the water vapor, so that the purpose of removing the solvent is achieved, and after most of the solvent is removed, the rubber polymer is separated out in a particle shape and is dispersed in the water.
The operating pressure of the second coagulation-flocculation kettle F2 is 0.05-0.1 MPa gauge pressure, preferably 0.06-0.09 MPa gauge pressure, the temperature is 92-110 ℃, preferably 103-110 ℃, and the temperature of the second coagulation-flocculation kettle F2 is controlled by adjusting the steam flow entering the bottom of the second coagulation-flocculation kettle.
The operating pressure of the third condensation kettle F3 is-0.002-0.005 MPa, preferably-0.001-0.003 MPa, the temperature is 80-100 ℃, preferably 93-100 ℃, steam is not introduced into the third kettle under normal operation, and the pressure of the third kettle F3 is controlled by adjusting the steam flow of the steam ejector J1.
In the process of the present invention, the crumb water from the third coagulation still has achieved sufficient concentration and heating effect, sufficient heat has been applied to facilitate further removal of the solvent from the polymer solution, no bottom purge steam has been required to remove the solvent, but only a small amount of steam has been required to sweep the walls of the still or disturb the crumb water, i.e. the process of the present invention preferably takes substantially all of the steam from the steam feed unit of the second coagulation still, and the steam consumed by the second coagulation still is considered to be the total amount of steam consumed by the coagulation process of the present invention.
The outstanding technical effects of the invention are as follows:
(1) the invention can be applied to newly built plants and can also be used for technical modification of the coagulation unit of some synthetic rubber plants. After the invention is adopted, not only can all functions of the original device be realized, but also the fine rubber particles carried by the steam at the top in the condensation first kettle are greatly reduced, the problem of glue blockage of subsequent equipment is relieved, the operation period of a subsequent solvent recovery device can be prolonged, and the product loss is reduced.
(2) Can improve the separation effect of the condensation kettle and reduce the water content in the gas phase.
(3) Has the effect of reducing material consumption and energy consumption. The steam discharged from the second tank F2 and the steam discharged from the third tank F3 were returned to the first tank F1, and particularly the steam discharged from the second tank F2 and the steam discharged from the third tank F3 were used as the entire first steam in the first tank F1. Therefore, the invention has general significance in improving the production efficiency of the synthetic rubber device and reducing the energy consumption and material consumption. The invention can also be applied to the extraction process of natural gum and the preparation process of biofuel.
Drawings
FIG. 1 is a schematic view of the apparatus of the present invention;
FIG. 2 is a schematic view showing the installation of a trough plate as an apparatus for trapping fine colloidal particles entrained in a gas phase in an embodiment of the present invention;
FIG. 3 is a plan view of the installation of the slot plate as the apparatus for trapping fine colloidal particles entrained in a gas phase in the embodiment of the present invention;
FIG. 4 is a plan view of the disk assembly of the apparatus for trapping fine colloidal particles entrained in a gas phase in an embodiment of the present invention;
wherein, the main equipment codes in the figure are explained as follows:
m1-mixer F1-first coagulation tank
F2-second coagulation still F3-third coagulation still
P1-first kettle colloidal particle water pump P2-second kettle colloidal particle water pump
P3-three kettle colloidal particle water pump J1-steam ejector
Reference numerals: 1 stirrer motor shaft, 2 stirrer, 3 device for trapping gas phase carried fine colloidal particles, 4 saw teeth and 5 hot water receiver.
Detailed Description
The following describes in detail specific embodiments of the present invention. It should be understood that the specific embodiments described herein are for purposes of illustration and explanation only and are not intended to limit the invention, which is embodied in the apparatus shown in FIG. 1.
FIG. 1 is a schematic diagram of an apparatus for trapping gas-phase entrained fine particles in a rubber solution elutriation process of the invention.
In a preferred embodiment of the present invention, three coagulation-flocculation vessels are used in series, and the first coagulation-flocculation vessel F1, the second coagulation-flocculation vessel F2 and the third coagulation-flocculation vessel F3 are arranged in this order, and the
The first condensation kettle is a first kettle, a feed inlet of the first condensation kettle is connected with the feed unit, a discharge outlet of the first condensation kettle is connected with a feed inlet of the second condensation kettle, and a first kettle colloidal particle water pump P1 is arranged on the first conveying pipe; the top of the steam pipe is provided with a first steam outlet pipe and a steam condenser which are used for condensing and recycling steam in the first steam pipe; the first steam outlet pipe on the side surface is connected with a second steam outlet pipe at the top of the second condensation kettle and a third steam outlet pipe at the top of the third condensation kettle; the top of the kettle is connected with a hot water pipe, and hot water directly flows into an annular hot water receiver in the kettle through the hot water pipe;
the bottom of the second coagulation kettle is connected with an external low-pressure steam pipe, a second discharge hole is connected with a feed inlet of the third coagulation kettle, and a second kettle colloidal particle water pump P2 is arranged on the second conveying pipe; the top of the kettle is connected with a hot water pipe, and hot water directly flows into an annular hot water receiver in the kettle through the hot water pipe;
the bottom of the third coagulation kettle is connected with an external low-pressure steam pipe, but is only used for preventing the colloidal particles in the third coagulation kettle from being blocked; the third discharge hole is connected with the feed inlet of the post-treatment process section through a third conveying pipe, and a three-kettle colloidal particle water pump P3 is arranged on the third conveying pipe; and a steam ejector J1 is arranged on the third steam outlet pipe.
As a preferred embodiment of the invention, a
As a preferred embodiment of the invention, the device for trapping the gas-phase entrained fine colloidal particles is a disc in figure 4, punctate holes or linear holes are uniformly distributed on the disc, optional baffles are arranged around the holes, optional gaps are left at the top ends of the baffles, and the optional gaps are in any shapes, preferably in a sawtooth shape; on the hot water receiver received hot water back inflow disc, under the effect of centrifugal force, some hot water was thrown away from the edge of disc, simultaneously because the disc is opened there is even hole, is equipped with the baffle around the hole, thereby hot water touchs the baffle under the effect of centrifugal force and falls down from the hole.
The low-pressure steam is introduced into the bottom of the second condensation kettle to be used as a heat source of the method, the temperature and the pressure of the second condensation kettle F2 are higher than those of the first condensation kettle F1, and the steam at the top returns to the bottom of the first condensation kettle, so that the latent heat of the steam can be utilized, and the effect of saving energy is achieved. The third coagulation reactor, which has a lower operating pressure, uses a steam ejector J1 to pressurize steam at the top of the reactor and returns the steam to the bottom of the first coagulation reactor.
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