CN111359243A - Solvent evaporation loss reduction treatment equipment and process - Google Patents
Solvent evaporation loss reduction treatment equipment and process Download PDFInfo
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- CN111359243A CN111359243A CN202010111052.1A CN202010111052A CN111359243A CN 111359243 A CN111359243 A CN 111359243A CN 202010111052 A CN202010111052 A CN 202010111052A CN 111359243 A CN111359243 A CN 111359243A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/26—Multiple-effect evaporating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/0082—Regulation; Control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/30—Accessories for evaporators ; Constructional details thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0033—Other features
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0033—Other features
- B01D5/0054—General arrangements, e.g. flow sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0057—Condensation of vapours; Recovering volatile solvents by condensation in combination with other processes
- B01D5/006—Condensation of vapours; Recovering volatile solvents by condensation in combination with other processes with evaporation or distillation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0078—Condensation of vapours; Recovering volatile solvents by condensation characterised by auxiliary systems or arrangements
- B01D5/009—Collecting, removing and/or treatment of the condensate
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Abstract
The invention discloses a solvent evaporation loss reduction treatment device and a process thereof, and the solvent evaporation loss reduction treatment device comprises a condenser, a cooler, a liquid receiving tank, a liquid draining device and a vacuumizing device, wherein a condensate output pipe of the condenser is connected with a cooling liquid input pipe of the cooler, the liquid receiving tank receives condensed liquid discharged from the cooler through a pipeline, the condenser is provided with a steam input pipe communicated with a steam outlet at the upper part of a concentration device, a steam-liquid separator is also arranged between the steam input pipe and the cooling liquid input pipe, and a steam-liquid input port of the steam-liquid separator is connected with a condensate outlet of the concentration device through a condensation discharge pipe; the invention firstly inputs feed liquid into the concentrator, then carries out vacuum pumping treatment, keeps the vacuum degree of each device by closing the control valve on the vacuum buffer tank, closes the vacuum pump during concentration/evaporation, always maintains the vacuum degree of-0.08 to-0.09 MPa, completely condenses the generated secondary steam, avoids the uncondensed steam from being discharged out of the device by the vacuum pump, and reduces the power consumption loss of more than 85 percent and the loss pumped away by the vacuum pump.
Description
Technical Field
The invention relates to the technical field of solvent evaporation and concentration, in particular to a solvent evaporation loss reduction treatment device and a solvent evaporation loss reduction treatment process.
Background
Evaporators and concentrators are widely applied to the technical fields of chemical industry, pharmacy, food and the like, the evaporators generally comprise a plurality of groups of heaters, evaporation chambers, condensers, vacuum pumps and drainage devices, and the evaporators or the concentrators generally work in a vacuum state. Chinese patent document CN 101972553 discloses a condensate discharge device in vacuum state, which includes a liquid receiving tank, a condensate inlet device in vacuum state connected to the upper part of the liquid receiving tank, a self-priming liquid discharge pump connected to the bottom of the liquid receiving tank, a liquid level sensor arranged in the liquid receiving tank for detecting the liquid in the liquid receiving tank, and a control system for controlling the on-off of the self-priming liquid discharge pump. In the above patent document, since the vacuum device is disposed above the condenser, when the solvent is evaporated in vacuum, the vacuum device is continuously operated, a part of the generated secondary steam is pumped away by the vacuum device, and since the solvent has good volatility, the loss during evaporation is between 5% and 8%.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a solvent evaporation loss reduction treatment device and a solvent evaporation loss reduction treatment process, wherein the solvent loss caused by the vacuum pumping of a vacuum device is reduced, and the vacuum degree of the solvent in normal evaporation is kept.
The invention adopts the following technical scheme:
in one aspect, the invention provides a solvent evaporation loss reduction treatment device, which is connected with a concentration device, the treatment equipment comprises a condenser, a cooler, a liquid receiving tank, a liquid draining device and a vacuumizing device, a condensate output pipe of the condenser is connected with a cooling liquid input pipe of the cooler, the liquid receiving tank receives the condensed liquid discharged from the cooler through a pipeline, the condenser is provided with a steam input pipe communicated with a steam outlet at the upper part of the concentration device, a steam-liquid separator is arranged between the steam input pipe and the cooling liquid input pipe, the steam output end of the steam-liquid separator is communicated with the steam input pipe through a pipeline, the liquid output end of the vapor-liquid separator is communicated with the cooling liquid input pipe, and the vapor-liquid input port of the vapor-liquid separator is connected with the condensate outlet of the concentration equipment through a condensation discharge pipe;
the vacuumizing device comprises a vacuum pump and a vacuum buffer tank, and the vacuum buffer tank is respectively communicated with the inner cavity of the cooler and the vacuum pump through corresponding vacuumizing pipelines;
the liquid drainage device is communicated with the inner cavity of the liquid receiving tank and is used for continuously pumping out the condensed liquid in the liquid receiving tank.
And a vacuum regulating valve is also arranged on a connecting pipeline between the steam output end of the steam-liquid separator and the steam input pipe.
Furthermore, a condensate buffer tank is further arranged on a pipeline between the liquid output end of the gas-liquid separator and the cooling liquid input pipe.
The liquid discharge device comprises a liquid discharge pump, a liquid level sensor and a controller, wherein the controller is electrically connected with the liquid discharge pump and the liquid level sensor respectively; the input pipeline of the liquid discharge pump is communicated with a liquid outlet at the lower end of the liquid receiving tank, an output pipeline and a return pipeline are respectively communicated with the liquid outlet pipeline of the liquid discharge pump, the return pipeline is communicated with the inside of the liquid receiving tank, a return valve is arranged on the return pipeline, a liquid outlet valve and a one-way valve are sequentially arranged on the output pipeline in the liquid discharge direction, and the controller is respectively electrically connected with the return valve and the liquid outlet valve.
And a quick-assembly valve is further arranged on an output pipeline of the liquid discharge pump and used for controlling the liquid discharge lift of the output pipeline.
The liquid level sensor includes:
the upper liquid level sensor is arranged at the upper part of the liquid receiving tank and controls the starting action of the liquid discharge pump through the controller when detecting that the liquid in the liquid receiving tank is in place;
the lower liquid level sensor is arranged at the lower part of the liquid receiving tank, and controls the closing action of the liquid discharge pump through the controller when the liquid in the liquid receiving tank cannot be detected;
the communication position of the return pipeline and the liquid receiving tank is arranged between the upper liquid level sensor and the lower liquid level sensor.
Further preferably, the concentration equipment is a double-effect concentrator, which comprises a first-effect concentrator and a second-effect concentrator;
the single-effect concentrator comprises a single-effect heater and a single-effect evaporation chamber, a steam outlet of the single-effect heater is communicated with an inner cavity of the single-effect evaporation chamber,
the double-effect concentrator comprises a double-effect heater and a double-effect evaporation chamber, a steam outlet of the double-effect heater is communicated with the upper part of an inner cavity of the double-effect evaporation chamber, a steam outlet of the first-effect evaporation chamber is communicated with the inner cavity of the double-effect heater, a condensate outlet of the double-effect heater is communicated with a steam-liquid inlet of the steam-liquid separator, and a steam-liquid mixture in the double-effect evaporation chamber after being evaporated is communicated with a steam input pipe of the condenser through a steam outlet in the upper part of the double-effect evaporation chamber;
the lower ends of the first-effect heater, the first-effect evaporation chamber, the second-effect heater and the second-effect evaporation chamber are respectively communicated with a material liquid pipeline.
In another aspect, the present invention further provides a solvent evaporation loss reduction treatment process, which comprises the following steps:
step 1, opening a feed valve of concentration equipment, inputting feed liquid into the concentration equipment, and closing the feed valve to stop feeding when the feed liquid reaches the upper limit of a liquid level;
step 2, starting a vacuum pump to carry out overall vacuum pumping treatment on the vacuum buffer tank, the cooler, the condenser and the concentration equipment, and when the vacuum degree of all the equipment reaches more than-0.09 MPa, sequentially closing a control valve and the vacuum pump on a vacuum pumping pipeline of the vacuum pump to keep all the equipment in a vacuum state;
step 3, inputting cooling water into the condenser and the cooler for refrigeration treatment;
and 7, after the concentrated liquid is concentrated to a certain degree, stopping steam heating, closing cooling water inlet in the condenser and the cooler after the liquid is not boiled any more, breaking the vacuum degree of an inner cavity of the condenser and the cooler until the vacuum degree reaches 0, opening a discharge valve of the concentration equipment, and discharging the concentrated liquid.
The concentration equipment is a primary-effect concentrator and a secondary-effect concentrator which are connected in series, and the vacuum degree of an evaporation chamber in the primary-effect concentrator is controlled to be-0.04 MPa and the boiling point of the feed liquid is 80-90 ℃ by adjusting a vacuum adjusting valve for controlling the evaporation chamber in the secondary-effect concentrator; the vacuum degree of a double-effect evaporation chamber in the double-effect concentrator is more than-0.08 MPa, and the boiling point of the feed liquid is 50-60 ℃.
When the upper liquid level sensor detects the liquid level of the liquid receiving tank, the controller controls the backflow valve to be opened and the liquid outlet valve to be closed, and the liquid discharge pump generates backflow operation; after the liquid discharge pump operates in a backflow mode for a set time, the backflow valve is closed, the liquid outlet valve is opened, and condensed liquid in the liquid receiving tank is discharged through the output pipeline.
The concentrator is one of a single-effect concentrator, a multi-effect concentrator, a falling film evaporator, an alcohol recovery concentrator, a vacuum decompression concentrator and a spherical concentrator, and a steam outlet on the concentrator is communicated with a steam input pipe on the condenser.
The technical scheme of the invention has the following advantages:
A. according to the invention, the feed liquid is firstly input into the concentrator, then each device is vacuumized, the vacuum degree in each device is kept by closing the control valve on the vacuum buffer tank, finally, the vacuum pump is closed during concentration/evaporation by inputting cooling water, steam and the like, the condensate is continuously and uninterruptedly discharged, the vacuum degree is always kept between-0.08 MPa and-0.09 MPa and cannot be reduced, the generated secondary steam can be completely condensed, and the uncondensed steam is not discharged out of the device through the vacuum pump, so that the loss pumped away by the vacuum pump is greatly reduced. The equipment is also suitable for concentration of aqueous solution and evaporation of sewage, and reduces the power consumption of the vacuum pump by more than 85%.
B. According to the invention, the liquid outlet pipeline of the liquid discharge pump is respectively communicated with the reflux pipeline and the output pipeline, and the reflux circulation is realized by controlling the opening of the reflux valve and the closing of the liquid outlet valve at the liquid discharge initial stage, so that the gas in the pipeline is completely discharged, and the cavitation phenomenon is avoided; and then the return pipeline is closed through a switching circuit, so that the condensate is efficiently discharged from the output pipeline, the lift and the flow of the discharged condensate are controlled through controlling the switching value of the quick-mounting valve, the automatic operation is realized, and the operation intensity is reduced. Simple structure, low cost, wide application range and suitability for various concentration/evaporators.
Drawings
In order to more clearly illustrate the embodiments of the present invention, the drawings which are needed to be used in the embodiments will be briefly described below, and it is apparent that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained from the drawings without inventive labor to those skilled in the art.
FIG. 1 is a schematic view of a solvent evaporation loss reducing apparatus provided in the present invention;
FIG. 2 is a schematic diagram of the overall structure of the present invention in use on a dual effect concentrator;
the labels in the figure are as follows:
1-concentration plant
11-one effect concentrator
111-one-effect heater, 112-one-effect evaporation chamber
12-two-effect concentrator
121-double-effect heater, 122-double-effect evaporation chamber
2-condenser
21-condensate outlet pipe, 22-steam inlet pipe
23-outlet of cooling water of condenser, 24-inlet of cooling water of condenser
3-cooler
31-coolant inlet pipe, 32-cooler cooling water outlet
33-cooler cooling water inlet
4-liquid receiving tank
5-a liquid discharge device;
51-positive displacement pump
52-liquid level sensor
521-upper level sensor, 522-lower level sensor,
6-evacuating device
61-vacuum pump, 62-vacuum buffer tank
7-a vapor-liquid separator; 8-a condensation discharge pipe; 9-vacuum regulating valve; 10-condensate buffer tank; 20-an input pipe; 30-a liquid outlet pipeline; 40-an output pipeline; 50-a return line; 60-a liquid outlet valve; 70-a one-way valve; 80-quick-mounting valve; 90-feed liquid pipeline; 100-a reflux valve; 101-a drainage pipeline; 102-drainage manifold.
a-a feed valve; b-a control valve; c-a steam inlet; d-a one-effect discharge valve; e-discharge main valve
f-double effect discharge valve, g-single effect vacuum meter, h-double effect vacuum meter.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; the connection can be mechanical connection or electrical connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1 and 2, the present invention provides a solvent evaporation loss reduction processing device, which is connected to a concentration device 1, the processing device includes a condenser 2, a cooler 3, a liquid receiving tank 4, a drainage device 5 and a vacuum pumping device 6, a condensate output pipe 21 of the condenser 2 is connected to a coolant input pipe 31 of the cooler 3, the liquid receiving tank 4 receives the condensate in the cooler 3 through a pipeline, the condenser 2 is provided with a steam input pipe 22, a vapor-liquid separator 7 is further arranged between the steam input pipe 22 and the coolant input pipe 31, a vapor output end of the vapor-liquid separator 7 is communicated with the steam input pipe 22 through a pipeline, a liquid output end of the vapor-liquid separator 7 is communicated with the coolant input pipe 31, and a vapor-liquid input port of the vapor-liquid separator 7 is connected to a condensate outlet of the concentration device 1 through a condensation discharge pipe 8; the vacuumizing device 6 comprises a vacuum pump 61 and a vacuum buffer tank 62, and the vacuum buffer tank 62 is respectively communicated with the inner cavity of the cooler 3 and the vacuum pump 61 through corresponding vacuumizing pipelines; the liquid discharge device 5 is communicated with the inner cavity of the liquid receiving tank 4 and is used for continuously pumping out the condensed liquid in the liquid receiving tank 4.
A vacuum regulating valve 9 is also arranged on a connecting pipeline between the steam output end of the steam-liquid separator 7 and the steam input pipe 22.
Preferably, a condensate buffer tank 10 is further provided on the pipeline between the liquid output end of the vapor-liquid separator 7 and the coolant input pipe 31. The liquid separated by the vapor-liquid separator 7 directly enters the condensate buffer tank 10 by the pressure difference between the cooler and the concentrator, and then enters the cooler.
The liquid discharging device 5 comprises a liquid discharging pump 51, a liquid level sensor 52 and a controller, wherein the controller is respectively electrically connected with the liquid discharging pump 51 and the liquid level sensor 52; an input pipeline 20 of a liquid discharge pump 51 is communicated with a liquid outlet at the lower end of the liquid receiving tank 4, an output pipeline 40 and a return pipeline 50 are respectively communicated with a liquid outlet pipeline 30 of the liquid discharge pump 51, the return pipeline 50 is communicated with the inside of the liquid receiving tank 4, a return valve 100 is arranged on the return pipeline 50, a liquid outlet valve 60 and a one-way valve 70 are sequentially arranged on the output pipeline 40 in the liquid discharge direction, and a controller is respectively electrically connected with the return valve 100 and the liquid outlet valve 60. In the initial stage of liquid drainage, only the reflux valve needs to be opened, and the liquid pumped by the liquid drainage pump enters the liquid receiving tank 4 through the reflux pipeline, so that the operation time is about several seconds, the aim is to eliminate gas in the pipeline and avoid the cavitation problem of the liquid drainage pump 51; then the liquid outlet valve 60 is opened, the return valve is closed, and the liquid drain pump directly drains the condensed liquid in the liquid receiving tank.
In order to control the output performance of the drainage pump 51 conveniently, the output pipeline 40 is further provided with a fast-assembling valve 80 for controlling the drainage lift of the output pipeline 40, the fast-assembling valve is rotated, the lift is increased by adjusting the flow to be small, and on the contrary, the drainage lift of the drainage pump is reduced.
The level sensor 52 employed in the present invention includes: an upper level sensor 521 and a lower level sensor 522.
The upper liquid level sensor 521 is arranged at the upper part of the liquid receiving tank 4, and controls the starting action of the liquid discharge pump 51 through the controller when detecting that the liquid in the liquid receiving tank 4 is in place; the lower liquid level sensor 522 is provided at the lower part of the liquid receiving tank 4, and controls the closing operation of the liquid discharge pump 51 by the controller when the liquid in the liquid receiving tank 4 is not detected; and the communication position of the return pipe 50 and the liquid receiving tank 4 is set between the upper level sensor 521 and the lower level sensor 522.
The concentration device 1 adopted by the invention can adopt a single-effect concentrator or a double-effect concentrator, and the invention preferably adopts the double-effect concentrator, wherein the double-effect concentrator comprises a first-effect concentrator 11 and a second-effect concentrator 12; the primary effect concentrator 11 comprises a primary effect heater 111 and a primary effect evaporation chamber 112, and a steam outlet of the primary effect heater 111 is communicated with an inner cavity of the primary effect evaporation chamber 112;
the two-effect concentrator 12 comprises a two-effect heater 121 and a two-effect evaporation chamber 122, a steam outlet of the two-effect heater 121 is communicated with the upper part of an inner cavity of the two-effect evaporation chamber 122, a steam outlet of the one-effect evaporation chamber 112 is communicated with the inner cavity of the two-effect heater 121, and a condensate outlet of the two-effect heater 121 is communicated with a steam-liquid inlet of the steam-liquid separator 7; the lower ends of the first-effect heater 111, the first-effect evaporation chamber 112, the second-effect heater 121 and the second-effect evaporation chamber 122 are respectively communicated with a material liquid pipeline 90. The inner cavities of the first-effect heater and the second-effect heater are respectively provided with a vertical pipeline for containing feed liquid, the upper end and the lower end of the pipeline are both opened, the opening positions close to the upper end and the lower end of the pipeline are respectively provided with a partition plate, the edge of each partition plate is fixedly connected with the inner side surface of the heater in a sealing manner, the pipeline penetrates through the upper partition plate and the lower partition plate, and the two partition plates are respectively connected with the pipeline in a sealing manner.
The steam inlet of the first-effect heater 111 is connected with a steam source and is also connected with a steam control valve. Opening the steam control valve, inputting steam into the shell pass between the two clapboards, feeding the feed liquid into each pipeline of the first-effect heater and the second-effect heater, directly feeding the steam into each pipeline, and heating the feed liquid under the action of the steam in the shell pass to evaporate the feed liquid. Because the feed liquid in the pipeline is evaporated under vacuum, the boiling point of the feed liquid is reduced, a vapor-liquid mixture generated by boiling the feed liquid in the pipeline enters the primary-effect steam chamber, the liquid falls in the primary-effect steam chamber, the rest vapor-liquid mixture rises and then enters the shell pass of the secondary-effect heater, the feed liquid in the pipeline of the secondary-effect heater is further heated, and condensed water generated in the shell pass of the primary-effect heater is discharged from the bottom of the shell pass. Because the vacuum degree in the double-effect heater is lower, the boiling point of the material liquid is lower than that in the first-effect heater, the material liquid in the double-effect heater is heated and then evaporated to enter the double-effect evaporation chamber, the liquid falls into the double-effect evaporation chamber, and the rest of the vapor-liquid mixture directly enters the condenser for condensation.
The first-effect heater and the second-effect heater are identical in structure, the bottom end of the first-effect heater is communicated with the bottom end of the first-effect evaporation chamber through a liquid discharge pipeline 101, the bottom end of the second-effect heater and the bottom end of the second-effect evaporation chamber are communicated through a liquid discharge pipeline, the concentrated liquid in the two concentrators is discharged, the two liquid discharge pipelines are communicated through another liquid discharge main pipe 102, and meanwhile, the first-effect discharge valve d, the second-effect discharge valve f and the discharge main valve e are respectively arranged on the liquid discharge main pipe 102.
As shown in FIG. 2, the present invention takes a double-effect concentrator as an example, and the solvent evaporation loss reduction treatment process comprises the following steps:
step 1, sequentially opening a feed valve a on a feed liquid pipeline 90 below a first-effect concentrator 11 and a second-effect concentrator 12, inputting feed liquid into a concentration device 1, and closing the feed valve a to stop feeding when the feed liquid reaches the upper limit of the liquid level;
step 2, starting a vacuum pump 61 and a control valve b to carry out integral vacuum pumping treatment on the vacuum buffer tank 62, the cooler 3, the condenser 2 and the concentration equipment 1, and when the vacuum degree of all the equipment reaches more than-0.09 MPa, closing the control valve b and the vacuum pump 61 on a vacuum pumping pipeline in sequence to keep all the equipment in a vacuum state;
step 3, inputting cooling water into a condenser cooling water inlet 24 of the condenser 2 and a cooler cooling water inlet 33 of the cooler 3 for refrigeration treatment; the condenser 2 and the cooler 3 are both provided with condensing tubes for refrigerating and condensing uncondensed steam;
and 4, opening a steam valve to enable steam to enter a shell pass of the primary-effect heater 111, heating input material liquid in the primary-effect heater and then evaporating, generating secondary steam after the material liquid is evaporated at a boiling point, observing the primary-effect vacuum gauge g by adjusting the opening of the vacuum adjusting valve 9, adjusting the vacuum degree in the primary-effect evaporation chamber 112 to be about-0.04 MPa, adjusting the vacuum degree of the secondary-effect vacuum gauge h without adjusting, and preferably enabling the vacuum degree to be not lower than-0.08 MPa when the vacuum degree is larger. Because of different vacuum degrees, the boiling point of the material liquid in the first-effect evaporation chamber is 80-90 ℃, and the boiling point of the material liquid in the second-effect evaporation chamber is 50-60 ℃; the secondary steam generated by the first-effect evaporation chamber passes through the shell pass of the second-effect heater to heat the feed liquid in the second-effect heater, and forms a part of condensed steam-liquid mixture in the shell pass of the second-effect heater, the part enters the steam-liquid separator 7 through the condensation discharge pipe 8 communicated with the shell pass of the second-effect heater, uncondensed steam enters the condenser 2 after passing through the vacuum regulating valve 9, and liquid enters the condensate buffer tank 10 through the connecting pipeline of the steam-liquid separator 7 and then enters the cooler 3, wherein the description is as follows: since the vacuum degree of the vapor-liquid separator 7 is-004 MPa and the vacuum degree of the cooler 3 is-0.08 MPa, the liquid can be automatically sucked into the cooler 3 by the vapor-liquid separator 7.
The vapor-liquid mixture evaporated by the double-effect evaporation chamber enters the condenser 2 from the upper part of the double-effect evaporation chamber 122 through the vapor input pipe 22, after condensation is carried out inside the double-effect evaporation chamber, the condensate enters the cooling liquid input pipe 31 through the condensate output pipe 21, and then is cooled and condensed by the cooler 3 to form condensed liquid which enters the liquid receiving tank 4.
And 5, when the condensate in the liquid receiving tank 4 reaches the set liquid level, opening the liquid discharge pump 51 and the reflux valve 100, closing the liquid outlet valve 60, enabling the liquid discharge pump 51 to generate reflux operation, so as to eliminate gas in the pipeline, after the reflux operation is carried out for 6-10 seconds, opening the liquid outlet valve 60 and the fast-assembling valve 80, closing the reflux valve 100, and adjusting the opening degree of the fast-assembling valve 80 to achieve the balance between the condensate discharging speed and the condensation speed, so that the condensate is continuously discharged by the liquid discharging device.
Because the solvent is continuously evaporated to form condensed liquid which flows into the liquid receiving tank, when the upper liquid level sensor 521 detects that the condensed liquid in the liquid receiving tank reaches the set upper limit of the liquid level, the liquid discharge pump 51 is automatically started to discharge the condensed liquid in a state of not damaging vacuum, and because the space is further released, the vacuum degree can be slightly increased, and after the space is balanced, the vacuum degree in the liquid receiving tank is kept unchanged.
And 6, observing the first-effect evaporation chamber 112 and the second-effect evaporation chamber 122 through windows, opening the feed valve a on the feed liquid pipeline 90 again when the feed liquid in the first-effect evaporation chamber and the second-effect evaporation chamber is reduced to the set lower liquid level limit, and closing the feed valve a after the first-effect heater, the first-effect evaporation chamber, the second-effect heater and the second-effect evaporation chamber are replenished to the upper liquid level limit.
And 7, after the feed liquid is concentrated to a certain degree, observing the primary effect evaporation chamber and the secondary effect evaporation chamber again through windows, closing a steam valve to stop steam heating when the liquid level of the feed liquid reaches the lower limit, closing cooling water inlet of the condenser 2 and the cooler 3 after the feed liquid is not boiled any more, breaking the vacuum degree of the inner cavities of the condenser 2 and the cooler 3 until the vacuum degree of the inner cavities reaches 0, opening a discharge valve a of the concentration equipment, and discharging the concentrated feed liquid.
The controller can be controlled by a single chip microcomputer or a PLC program, automatic control of each control valve and the liquid discharge pump can be realized by programming the control program, the whole control program can be programmed according to the control flow provided by the invention, and control is realized by programming languages and control elements, which is not described again.
Before steam heating is not conducted, the vacuum pump is started again for the first material liquid, the overall vacuum degree of the equipment is pumped to be more than minus 0.09MPa, the vacuum control valve and the vacuum pump are turned off, steam heating evaporation is conducted again, the vacuum degree is slightly reduced by generated secondary steam at the initial stage of evaporation, the liquid is released after the secondary steam is condensed, the vacuum degree is slightly increased, steam can be completely condensed due to the condenser and the cooler which are independently connected in series, and the vacuum environment is not damaged when condensate is discharged, so that the vacuum degree is always maintained to be more than minus 0.08MPa during concentration, the vacuum pump is always in a closed state during concentration, and therefore non-condensed steam cannot be pumped away by the vacuum pump, and loss is greatly reduced.
According to the invention, feed liquid is firstly input into the concentrator, then each device is vacuumized, the vacuum degree in each device is kept by closing a control valve on a vacuum buffer tank, finally, the vacuum pump is closed during concentration/evaporation by inputting cooling water, steam and the like, condensate is continuously and uninterruptedly discharged, the vacuum degree is always kept between-0.08 MPa and-0.09 MPa and cannot be reduced, generated secondary steam can be completely condensed, and uncondensed steam is not discharged out of the device through the vacuum pump, so that the loss pumped away by the vacuum pump is greatly reduced. The equipment is also suitable for concentration of aqueous solution and sewage evaporation, reduces the power consumption loss of a vacuum pump to be more than 85 percent, realizes solvent concentration in a vacuum maintaining state, and greatly reduces the solvent evaporation loss.
In addition, the concentrator can also adopt one of a single-effect concentrator, a multi-effect concentrator, a falling film evaporator, an alcohol recovery concentrator, a vacuum decompression concentrator and a spherical concentrator, and a steam outlet on the concentrator is communicated with a steam input pipe on the condenser.
For example, when the single-effect concentrator is adopted, the single-effect concentrator comprises a heater and an evaporation chamber, a steam outlet on the evaporation chamber is directly connected with a steam input pipe of a condenser, steam condensation is completely realized through the condenser and a cooler in sequence, and then the steam is discharged into a liquid receiving tank and is continuously discharged through a liquid discharging device.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are intended to be within the scope of the invention.
Claims (11)
1. A solvent evaporation loss reduction treatment device is connected with a concentration device (1), and is characterized in that the treatment device comprises a condenser (2), a cooler (3), a liquid receiving tank (4), a liquid draining device (5) and a vacuumizing device (6), a condensate output pipe (21) of the condenser (2) is connected with a cooling liquid input pipe (31) of the cooler (3), the liquid receiving tank (4) receives the condensed liquid discharged from the cooler (3) through a pipeline, a steam input pipe (22) communicated with a steam outlet at the upper part of the concentration device (1) is arranged on the condenser (2), a steam-liquid separator (7) is further arranged between the steam input pipe (22) and the cooling liquid input pipe (31), and the steam output end of the steam-liquid separator (7) is communicated with the steam input pipe (22) through a pipeline, the liquid output end of the vapor-liquid separator (7) is communicated with the cooling liquid input pipe (31), and the vapor-liquid input port of the vapor-liquid separator (7) is connected with the condensate outlet of the concentration equipment (1) through a condensation discharge pipe (8);
the vacuumizing device (6) comprises a vacuum pump (61) and a vacuum buffer tank (62), and the vacuum buffer tank (62) is respectively communicated with the inner cavity of the cooler (3) and the vacuum pump (61) through corresponding vacuumizing pipelines;
the liquid drainage device (5) is communicated with the inner cavity of the liquid receiving tank (4) and is used for continuously pumping out the condensed liquid in the liquid receiving tank (4).
2. The solvent evaporation loss-reducing treatment apparatus according to claim 1, wherein a vacuum regulating valve (9) is further provided on a connection pipeline between the steam output end of the steam-liquid separator (7) and the steam input pipe (22).
3. The solvent evaporation loss reduction treatment apparatus according to claim 2, wherein a condensate buffer tank (10) is further provided on the pipeline between the liquid output end of the vapor-liquid separator (7) and the cooling liquid input pipe (31).
4. The solvent evaporation loss reduction treatment apparatus according to any one of claims 1 to 3, wherein the drain device (5) comprises a drain pump (51), a liquid level sensor (52) and a controller, and the controller is electrically connected to the drain pump (51) and the liquid level sensor (52), respectively; an input pipeline (20) of the liquid discharge pump (51) is communicated with a liquid outlet at the lower end of the liquid receiving tank (4), an output pipeline (40) and a backflow pipeline (50) are respectively communicated with a liquid outlet pipeline (30) of the liquid discharge pump (51), the backflow pipeline (50) is communicated with the inside of the liquid receiving tank (4), a backflow valve (100) is arranged on the backflow pipeline (50), a liquid outlet valve (60) and a one-way valve (70) are sequentially arranged on the output pipeline (40) in the liquid discharge direction, and the controller is respectively electrically connected with the backflow valve (100) and the liquid outlet valve (60).
5. The solvent evaporation loss reduction treatment equipment according to claim 4, wherein a fast valve (80) is further arranged on the output pipeline (40) of the liquid discharge pump (51) and used for controlling the liquid discharge lift of the output pipeline (40).
6. The solvent evaporation loss reduction processing apparatus according to claim 5,
the level sensor (52) includes:
an upper liquid level sensor (521) which is arranged at the upper part of the liquid receiving tank (4) and controls the opening action of the liquid discharge pump (51) through the controller when detecting that the liquid in the liquid receiving tank (4) is in place;
a lower liquid level sensor (522) that is provided below the liquid receiving tank (4) and controls the closing operation of the drain pump (51) by the controller when the liquid in the liquid receiving tank (4) is not detected;
the communication position of the return pipeline (50) and the liquid receiving tank (4) is arranged between the upper liquid level sensor (521) and the lower liquid level sensor (522).
7. The solvent evaporation loss reducing treatment apparatus according to claim 1, wherein the concentration apparatus (1) is a double effect concentrator comprising a single effect concentrator (11) and a double effect concentrator (12);
the single-effect concentrator (11) comprises a single-effect heater (111) and a single-effect evaporation chamber (112), a steam outlet of the single-effect heater (111) is communicated with an inner cavity of the single-effect evaporation chamber (112),
the two-effect concentrator (12) comprises a two-effect heater (121) and a two-effect evaporation chamber (122), a steam outlet of the two-effect heater (121) is communicated with the upper part of an inner cavity of the two-effect evaporation chamber (122), a steam outlet of the first-effect evaporation chamber (112) is communicated with the inner cavity of the two-effect heater (121), a condensate outlet of the two-effect heater (121) is communicated with a steam-liquid input port of the steam-liquid separator (7), and a steam-liquid mixture in the two-effect evaporation chamber (122) after being evaporated is communicated with a steam input pipe (22) of the condenser (2) through a steam outlet at the upper part of the two-effect evaporation chamber;
the lower ends of the first-effect heater (111), the first-effect evaporation chamber (112), the second-effect heater (121) and the second-effect evaporation chamber (122) are respectively communicated with a material liquid pipeline (90).
8. A solvent evaporation loss reduction treatment process is characterized by comprising the following steps:
step 1, opening a feed valve of concentration equipment, inputting feed liquid into the concentration equipment, and closing the feed valve to stop feeding when the feed liquid reaches the upper limit of a liquid level;
step 2, starting a vacuum pump to carry out overall vacuum pumping treatment on the vacuum buffer tank, the cooler, the condenser and the concentration equipment, and when the vacuum degree of all the equipment reaches more than-0.09 MPa, sequentially closing a control valve and the vacuum pump on a vacuum pumping pipeline of the vacuum pump to keep all the equipment in a vacuum state;
step 3, inputting cooling water into the condenser and the cooler for refrigeration treatment;
step 4, opening a steam valve of the concentration equipment, inputting steam into the concentration equipment, heating input liquid in the concentration equipment, evaporating, and enabling a steam-liquid mixture formed after evaporation to enter a condenser from the upper part of the concentration equipment; condensed water and uncondensed steam generated in the concentration equipment enter a steam-liquid separator from the lower part of the condensation equipment for steam-liquid separation, the condensed water directly enters a cooler, the uncondensed steam and a steam-liquid mixture on the upper part of the concentration equipment enter the condenser together, and condensed liquid is formed after the uncondensed steam and the steam-liquid mixture sequentially pass through the condenser and the cooler and enter a liquid receiving tank;
step 5, when the condensate in the liquid receiving tank reaches the set liquid level, opening and adjusting the liquid drainage device to enable the liquid drainage device to continuously drain the condensate;
step 6, when the feed liquid in the concentration equipment is reduced to the set lower liquid level limit, opening a feed valve of the concentration equipment, supplementing the liquid to the concentration equipment to the upper liquid level limit, and closing the feed valve;
and 7, after the concentrated liquid is concentrated to a certain degree, stopping steam heating, closing cooling water inlet in the condenser and the cooler after the liquid is not boiled any more, breaking the vacuum degree of an inner cavity of the condenser and the cooler until the vacuum degree reaches 0, opening a discharge valve of the concentration equipment, and discharging the concentrated liquid.
9. The solvent evaporation loss reduction treatment process according to claim 8, wherein the concentration equipment comprises a first-effect concentrator and a second-effect concentrator which are connected in series, and the vacuum degree of the first-effect evaporation chamber in the first-effect concentrator is-0.04 MPa, the vacuum degree of the second-effect evaporation chamber in the second-effect concentrator is more than-0.08 MPa, and the boiling point of the feed liquid is 50-60 ℃ by adjusting a vacuum adjusting valve for controlling the evaporation chamber in the second-effect concentrator.
10. The solvent evaporation loss-reducing treatment process as claimed in claim 8, wherein when the upper liquid level sensor detects the liquid level of the liquid receiving tank, the controller controls the backflow valve to be opened and the liquid outlet valve to be closed, and the liquid discharge pump is enabled to generate backflow operation; after the liquid discharge pump operates in a backflow mode for a set time, the backflow valve is closed, the liquid outlet valve is opened, and condensed liquid in the liquid receiving tank is discharged through the output pipeline.
11. The solvent evaporation loss reduction treatment process according to claim 8, wherein the concentrator is one of a single-effect concentrator, a multi-effect concentrator, a falling-film evaporator, an alcohol recovery concentrator, a vacuum pressure reduction concentrator and a spherical concentrator, and a steam outlet on the concentrator is communicated with a steam input pipe on the condenser.
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