CN110075557B - Multistage switching type feed liquid evaporation method and device - Google Patents
Multistage switching type feed liquid evaporation method and device Download PDFInfo
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- CN110075557B CN110075557B CN201910479693.XA CN201910479693A CN110075557B CN 110075557 B CN110075557 B CN 110075557B CN 201910479693 A CN201910479693 A CN 201910479693A CN 110075557 B CN110075557 B CN 110075557B
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- 239000007788 liquid Substances 0.000 title claims abstract description 135
- 238000001704 evaporation Methods 0.000 title claims abstract description 77
- 238000010438 heat treatment Methods 0.000 claims abstract description 55
- 230000008020 evaporation Effects 0.000 claims abstract description 50
- 230000000694 effects Effects 0.000 claims abstract description 6
- 238000011084 recovery Methods 0.000 claims description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 35
- 239000002994 raw material Substances 0.000 claims description 9
- 239000000498 cooling water Substances 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 8
- 239000003814 drug Substances 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 3
- 238000011282 treatment Methods 0.000 abstract description 3
- 230000007423 decrease Effects 0.000 abstract description 2
- 239000002699 waste material Substances 0.000 abstract description 2
- 239000010408 film Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 125000004122 cyclic group Chemical group 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009194 climbing Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 239000011552 falling film Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000011369 optimal treatment Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/0011—Heating features
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/0094—Evaporating with forced circulation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/16—Evaporating by spraying
- B01D1/20—Sprayers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/22—Evaporating by bringing a thin layer of the liquid into contact with a heated surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/26—Multiple-effect evaporating
-
- 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
-
- 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
- B01D5/0036—Multiple-effect condensation; Fractional condensation
-
- 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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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention discloses a multistage switching type feed liquid evaporation method and device, comprising multistage mutually switched evaporation devices, wherein two sides of an evaporation chamber are respectively provided with a group of upper and lower two-stage heating devices, and each stage of heating devices on two sides is connected through a straight pipe; the multistage heater works in a state of 100%, as the feed liquid amount gradually decreases, feed liquid cannot flow back to the evaporation chamber from the heater, the one-stage heater or the multistage heater can be closed according to the feed liquid circulation amount, the feed liquid is further reduced until the last-stage heater is closed, when the working capacity is the minimum heating evaporation amount of the whole machine, the residual small amount of feed liquid can be completely treated, and an ideal treatment effect is obtained, so that the waste of the feed liquid is prevented, and the working efficiency is improved.
Description
Technical Field
The invention discloses a multistage switching type feed liquid evaporation method and device, in particular relates to a feed liquid concentration device and a feed liquid evaporator thereof, and belongs to the technical field of liquid medicine concentration.
Background
In the technical fields of pharmacy, chemical industry and the like, in order to realize the purification and concentration of effective substances, a feed liquid concentration device is generally adopted for concentration and purification treatment. The liquid medicine concentration device generally adopts a heater to heat low-concentration liquid medicine, a foam mixture is generated in the heater by using a climbing film technology and is conveyed into an evaporation chamber through a pipeline, and the liquid medicine is quickly evaporated under the negative pressure condition.
In the existing production equipment, the pipelines of the heater and the evaporation chamber are short linear pipelines, and the foam mixture generated by rising the film directly enters the evaporator and rapidly falls down and is deposited at the bottom of the evaporation chamber under the action of gravity. Therefore, the feed liquid does not have enough surface area to evaporate in the negative pressure environment, the evaporation chamber is mostly in a straight cylinder shape, the evaporation area cannot be effectively increased, and the evaporation efficiency is reduced. Each stage of feed liquid evaporator is only provided with one heater, so that a small amount of feed liquid concentration is difficult to realize, and the residual feed liquid cannot be treated and is wasted.
Disclosure of Invention
The invention provides a multistage switching type feed liquid evaporation method and device, which improve the concentration efficiency of the existing feed liquid concentration device, can realize the fractional concentration of feed liquid, and can meet the feed liquid concentration requirement by one-time concentration.
The invention provides a multistage switching type feed liquid evaporation method, which comprises multistage mutually switched evaporation devices, wherein two sides of an evaporation chamber are respectively provided with a group of upper and lower two-stage heating devices, and each stage of heating device on two sides is connected through a straight pipe; the multistage heater works in a state of 100%, as the feed liquid amount gradually decreases, the feed liquid cannot flow back to the evaporation chamber from the heater, the one-stage heater or the multistage heater can be closed according to the feed liquid circulation amount, the feed liquid is further reduced until the last-stage heater is closed, when the working capacity is the minimum heating evaporation amount of the whole machine, the residual small amount of feed liquid can be completely treated, the ideal treatment effect is obtained, and the waste of the feed liquid is prevented.
The invention discloses a multistage switching type material liquid evaporation method, which adopts the technical scheme that the method comprises the following steps:
1) The raw material liquid inlet sucks the raw material liquid into the evaporation chamber by negative pressure, the raw material liquid is conveyed to the first-fourth stage heater by the circulating pump for circulating heating, and the third-stage heater, the fourth-stage heater and the circulating pump thereof are closed step by step along with the continuous reduction of the raw material liquid, so that the heating circulation is stopped; the circulating pump pushes the feed liquid to further heat and circularly evaporate through the first-stage heater and the second-stage heater, and the feed liquid is continuously reduced until the last-stage heater is heated: when the volume of the feed liquid is smaller than the sum of the heating spaces of the first-stage heater and the second-stage heater, the second-stage heater heats, and the residual feed liquid is concentrated, so that the switching working function of the heater is realized;
2) When the feed liquid circulates among the heating device, the feeding loop, the evaporating chamber and the discharging loop, the tail end of the feeding loop is provided with an annular flow dividing device for distributing the feed liquid, the feed liquid is sprayed to the inner wall of the evaporating chamber, the evaporating area is increased, and the working efficiency is improved;
3) In the secondary condenser; the first recovery tank collects condensed water passing through the first condenser and the second condenser and discharges the condensed water from the water outlet; delivering the gas not condensed by the first condenser to the second condenser through a second steam pipeline; the second liquid collecting tank collects and transmits condensed water discharged by the heating device at the last stage to the first recovery tank, and the second liquid collecting tank is connected with the discharge port through the water outlet;
The multistage switching type feed liquid evaporator suitable for the evaporation method mainly comprises a heating device, an evaporation chamber, a circulating pump, a secondary condenser, a first recovery tank, a second recovery tank, a vacuum pump and corresponding pipelines; wherein,
The heating device consists of a first-stage heater, a second-stage heater, a third-stage heater and a fourth-stage heater; the first-stage heater and the second-stage heater are connected in series to form a first group of heaters, the third-stage heater and the fourth-stage heater are connected in series to form a second group of heaters, and the two groups of heaters are connected in parallel and then are respectively connected with a feeding loop and a discharging loop of the evaporation chamber through a circulating pump:
The secondary condenser comprises: comprises a first condenser, a first-stage circulating water inlet and a first-stage circulating water outlet; the second condenser, the second stage cooling water inlet and the second stage cooling water outlet; a first recovery tank and a second recovery tank;
the steam outlet of the evaporation chamber is connected with a first-stage condenser and a second condenser in series, and the first-stage condenser and the second condenser are respectively connected with a first recovery tank; the first recovery tank is connected with the condensate outlet of the first-stage heater to the fourth-stage heater after being connected with the second recovery tank in series;
the first-stage condenser is connected with the first-stage recovery tank through a first condensate pipeline;
the second-stage condenser is connected with the first-stage recovery tank through a second steam pipeline and a third condensate pipeline; the second condensate pipeline and the third condensate pipeline are connected in parallel;
the water outlet of the first recovery tank is connected with the discharge port;
The evaporation chamber is of a sealed tank structure, the side wall of the lower part is in an inclined cone shape, and the angle between the inclined cone and the vertical angle is 5-15 degrees; an annular flow dividing device is arranged at the upper part in the evaporation chamber, and the annular flow dividing device is of a hollow annular structure; a plurality of spraying small holes are uniformly distributed on the periphery of the circular ring to form an annular spraying pipe, the center of the circular ring is communicated with a cross pipeline, and the center of the pipeline is connected with a feeding loop at the top of the evaporation chamber; the bottom of the evaporating chamber is connected with a discharging loop, and a negative pressure environment lower than atmospheric pressure is formed in the evaporating chamber under the negative pressure effect of a vacuum pump on a steam outlet of the evaporating chamber;
In the invention, the evaporation chamber of the feed liquid evaporator at the previous stage is communicated with the heating input pipelines of the plurality of heaters of the feed liquid evaporator at the next stage; each level of feed liquid evaporator of the feed liquid concentration device is provided with two groups of four-level heaters, each two-level heater is connected through a straight pipe, two-level heaters distributed on two sides of an evaporation chamber are connected in series to form a group, each level of evaporator is provided with two groups of heaters, when a large amount of feed liquid is processed, the two groups of four-level heaters work at the same time in full load, along with the separation of water molecules and the feed liquid in the cyclic evaporation process of the feed liquid, the feed liquid is continuously reduced, the heaters are turned off step by step to enable the residual small amount of feed liquid to achieve the optimal treatment effect, each group of heaters is provided with a booster cyclic device, and the cyclic feed liquid of the two groups of heaters is collected to the annular shunt device for ejection evaporation.
The invention has the positive effects that:
When a large amount of feed liquid is processed by adopting the heaters with the multiple stages of mutual switching, the four-stage or multi-stage heater works under full load, and the heaters are turned off step by step along with the continuous reduction of the feed liquid amount until the last-stage heater is turned off, so that the residual feed liquid can be completely processed; the annular flow dividing device is combined with the oblique cone type evaporation chamber, and the feed liquid is uniformly dispersed to the periphery of the inner wall of the evaporation chamber through the flow dividing device, so that the feed liquid flows downwards along the inner wall of the oblique cone type evaporation chamber in a falling film mode, large-area evaporation is formed, and the working efficiency is improved.
Drawings
FIG. 1 is a schematic diagram of a multistage switching feed liquid evaporator according to the present invention;
FIG. 2 is a schematic diagram of the structure of the evaporating chamber of the present invention;
FIG. 3 is a cross-sectional view of the evaporation chamber of the invention taken along the A-A plane.
Detailed Description
The present invention will be further described in detail below with reference to the drawings and specific examples for better understanding of the technical solutions of the present invention to those skilled in the art.
Example 1
The concentration process is gradually decreased from the 100% working state of the heating device to the 25% working state; as the water molecules and the feed liquid are separated in the process of lifting the membrane and concentrating, the feed liquid is continuously reduced, and the heaters 1.3 and 1.4 and the circulating pump 5.2 are closed step by step; the working state of 50% is reached, the volume of the feed liquid is further reduced (the volume of the feed liquid is smaller than the sum of the heating spaces of the heaters 1.1 and 1.2) until the last stage heater 1.2 works, and the residual feed liquid is concentrated.
FIG. 1 is a schematic diagram of a feed liquid concentrating device of the invention, which mainly comprises a heating device 1, an evaporating chamber 2, a circulating pump 5, two first-stage condensers 6.1 and second condensers 6.2 which are connected in series, two recovery tanks 7.1 and 7.2, a vacuum pump 16 and corresponding pipelines; wherein,
The heating device 1 consists of a first-stage heater 1.1, a second-stage heater 1.2, a third-stage heater 1.3 and a fourth-stage heater 1.4, wherein the first-stage heater 1.1 and the second-stage heater 1.2 are connected in series to form a first group, the third-stage heater 1.3 and the fourth-stage heater 1.4 are connected in series to form a second group, and the two groups of heaters are connected in parallel and then are respectively connected with a feeding loop 3 and a discharging loop 4 of the evaporation chamber 2 through a circulating pump 5:
the steam outlet 13 of the evaporating chamber 2 is connected in series with the first stage condenser 6.1 and the second condenser 6.2, and the first condenser 6.1 and the second condenser 6.2 are respectively connected with the first recovery tank 7.1; the first recovery tank 7.1 is connected with the second recovery tank 7.2 in series and then is connected with the condensate outlet 9 of the first-stage heater 1.1 to the fourth-stage heater 1.4;
the first condenser 6.1 is connected with the first recovery tank 7.1 through a first condensate line 14;
The second condenser 6.2 is connected with the first recovery tank 7.1 through a second steam pipeline 18 and a third condensate pipeline 19; the second condensate line 18 and the third condensate line 19 are connected in parallel;
The water outlet of the first recovery tank 7.1 is connected with the discharge port;
Referring to fig. 2 and 3, the evaporation chamber 2 is a sealed tank structure, the side wall of the lower part is in an inclined cone shape, and the angle between the inclined cone and the vertical angle is 5-15 degrees; the upper part in the evaporation chamber 2 is provided with an annular flow dividing device 3.1, and the annular flow dividing device 3.1 is of a hollow circular ring structure; a plurality of spraying small holes are uniformly distributed on the periphery of the circular ring to form an annular spraying pipe, the center of the circular ring is communicated with a cross pipeline, and the center of the pipeline is connected with a feeding loop 3 at the top of the evaporation chamber 2; the bottom of the evaporation chamber 2 is connected with a discharge loop 4, and a negative pressure environment lower than atmospheric pressure is formed in the evaporation chamber 2 under the negative pressure effect of a vacuum pump 16 on a steam outlet 13;
the secondary condenser comprises a first condenser 6.1, a first-stage circulating water inlet 10.1 and a first-stage circulating water outlet 10.2; a second cooler 6.2, a second stage cooling water inlet 11.1 and a second stage cooling water outlet 11.2.
The evaporation method provided by the invention comprises the following steps of:
1) The raw material liquid inlet 12 sucks the feed liquid into the evaporation chamber 2 by negative pressure, the feed liquid is conveyed to the first-stage heater 1.1, the second-stage heater 1.2, the third-stage heater 1.3 and the fourth-stage heater 1.4 through the circulating pump 5.1 and the circulating pump 5.2 for circulating heating, the third-stage heater 1.3, the fourth-stage heater 1.4 and the circulating pump 5.2 are closed step by step along with the continuous reduction of the feed liquid, and the third-stage heater 1.3 and the fourth-stage heater 1.4 stop heating circulation; the circulating pump 5.1 pushes the feed liquid to be heated and circulated and evaporated through the first-stage heater 1.1 and the second-stage heater 1.2, and the feed liquid is continuously reduced until the last-stage heater 1.2 is heated: when the volume of the feed liquid is smaller than the sum of the heating spaces of the first-stage heater 1.1 and the second-stage heater 1.2, the second-stage heater 1.2 heats, and the residual feed liquid is concentrated, so that the switching working function of the heater is realized;
2) When the feed liquid circulates among the heating device 1, the feeding loop 3, the evaporation chamber 2 and the discharging loop 4, the tail end of the feeding loop 3 is provided with an annular flow dividing device 3.1 for distributing the liquid medicine, the feed liquid is sprayed to the inner wall of the evaporation chamber, the evaporation area is increased, and the working efficiency is improved;
3) The second-stage condenser comprises a first condenser 6.1, a first-stage circulating water inlet 10.1 and a first-stage circulating water outlet 10.2; a second cooler 6.2, a second stage cooling water inlet 11.1 and a second stage cooling water outlet 11.2; a first recovery tank 7.1 and a second recovery tank 7.2. The first recovery tank 7.1 collects condensed water passing through the first condenser 6.1 and the second condenser 6.2 and discharges the condensed water from the water outlet 17; the gas which is not condensed by the first condenser 6.1 is conveyed to the second condenser 6.2 via the second vapor line 18; the second liquid collecting tank 7.2 collects and conveys the condensed water discharged from the heating device 1 at the last stage to the first recovery tank 7.1, and the condensed water is connected with a discharge port through a water outlet 17.
The heating device 1 of the present invention may adopt steam heating or high-pressure hot water heating used in the conventional technology, or may adopt electric heating used in other fields, etc., as long as the material liquid temperature is raised and the film is raised. The four heaters in the heating device 1 can be independently fed with heat sources to perform heating operation, but a high-temperature steam or high-pressure hot water heating mode is considered to be adopted to stably maintain the heating temperature and reduce the influence of temperature fluctuation on the feed liquid in the heating process, and the steam heating or high-pressure hot water heating mode is preferred. In addition, in view of the structure of the heating device 1, the heating device may be a tubular heating device 1 or a plate heating device 1, but a better film lifting in the heating device 1 should be ensured, and rapid breaking of bubbles and lowering of film lifting efficiency due to a smaller space of the heating device 1 are prevented.
The feed liquid concentration device of the invention can be provided with more than one stage of feed liquid evaporators. The multi-stage feed liquid evaporators are connected in series to realize the gradual concentration of feed liquid and fully utilize heat; of course, according to actual requirements, only a first-stage feed liquid evaporator can be adopted. The feed liquid concentrating device in fig. 1 adopts a two-stage feed liquid evaporator. The feed liquid concentration device in fig. 1 adopts water as feed liquid medium, wherein the feed liquid evaporator positioned at the front side is a first-stage evaporator, the feed liquid evaporator positioned at the rear side is a second-stage evaporator, the evaporation chamber 2 of the first-stage feed liquid evaporator is communicated with the heating input pipeline of the heating device 1 of the second-stage feed liquid evaporator, that is, the steam discharged from the first-stage feed liquid evaporator enters the second-stage feed liquid evaporator to be used as a heat source of the second-stage heating device, and the steam is transmitted to the feed liquid in the second-stage heating device through the second-stage heating device 1.
The feed liquid of the second-stage feed liquid evaporator is conveyed by the first-stage feed liquid evaporator. In order to transfer the feed liquid of the first-stage feed liquid evaporator to the second-stage feed liquid evaporator, a communicating pipeline is arranged in the bottom area of the first-stage feed liquid evaporator and is provided with a valve for controlling whether the first-stage feed liquid evaporator is conducted or not. The valves can all adopt electromagnetic valves, and the feed liquid with different concentrations is conveyed by cooperatively controlling the opening and closing of each electromagnetic valve. As can be seen from the pipeline in fig. 1, the power-assisted circulation device 5 in each feed liquid evaporator can also be used as a power source for conveying feed liquid to the subsequent-stage evaporator.
Fig. 1 shows not only the core of the feed liquid concentrating device of the present invention, but also its associated heat source supply line. The corresponding steam supply pipelines 8 directly supply saturated steam to the first-stage heater 1.1, the second-stage heater 1.2, the third-stage heater 1.3 and the fourth-stage heater 1.4 in the heating device 1 respectively, and the condensate outlet 9 returns residual steam and condensate; the high-temperature steam discharged from the steam outlet 13 at the upper part of the evaporating chamber 2 is transmitted to the first-stage heater 1.1, the second-stage heater 1.2, the third-stage heater 1.3 and the fourth-stage heater 1.4 in the second-stage heating device to heat the second-stage heating device. In addition, a steam regulating valve and a steam drain valve device are respectively arranged on the steam supply pipeline 8 and the condensate outlet 9, the steam supply quantity is automatically regulated, and the steam condensate and non-condensable gas in the heating equipment and the pipeline are automatically discharged.
In order to realize energy recycling, the feed liquid concentration device in fig. 1 is further provided with a first-stage condenser 6.1, a second condenser 6.2, a first recovery tank 7.1 and a second recovery tank 7.2. The first-stage condenser 6.1 and the second condenser 6.2 can be arranged at the exhaust port of the evaporation chamber 2 of the last-stage feed liquid evaporator, and heat in the steam discharged by the last-stage feed liquid evaporator is recovered; the first stage condenser 6.1 and the second condenser 6.2 are directly arranged at the exhaust port of the evaporation chamber 2 of the last stage feed liquid evaporator.
The condensers in the first stage condenser 6.1 and the second stage condenser 6.2 can adopt a water cooling mode or other high-performance refrigerant refrigerating modes. In particular, in the feed liquid concentration device adopting solvents such as ethanol, the first-stage condenser 6.1 and the second condenser 6.2 preferably adopt high-performance refrigerants for refrigeration, so that the recovery efficiency of the ethanol is improved.
In one embodiment of the invention, a feed liquid concentration device with a general structure as shown in fig. 1 is manufactured by adopting the components, electromagnetic valves are arranged at the positions of pipelines which are required to be conducted at specific time and disconnected at specific time, and the work of each electromagnetic valve is cooperatively controlled by a central control computer. The feed liquid enters the first feed liquid evaporator through the feed liquid inlet 12 and then starts to continuously produce concentrated feed liquid with the concentration meeting the process requirement after one hour.
Claims (1)
1. A multi-stage switching type material liquid evaporation method comprises the following steps:
1) The raw material liquid inlet sucks the raw material liquid into the evaporation chamber by negative pressure, the raw material liquid is conveyed to the first-fourth stage heater by the circulating pump for circulating heating, and the third-stage heater, the fourth-stage heater and the circulating pump thereof are closed step by step along with the continuous reduction of the raw material liquid, so that the heating circulation is stopped; the circulating pump pushes the feed liquid to further heat and circularly evaporate through the first-stage heater and the second-stage heater, the feed liquid is continuously reduced, when the volume of the feed liquid is smaller than the sum of heating spaces of the first-stage heater and the second-stage heater, the first-stage heater is closed, the feed liquid is heated through the second-stage heater, and the residual feed liquid is concentrated, so that the switching work function of the heaters is realized;
2) When the feed liquid circulates among the heating device, the feeding loop, the evaporating chamber and the discharging loop, an annular flow dividing device for distributing the liquid medicine is arranged at the tail end of the feeding loop, the feed liquid is sprayed to the inner wall of the evaporating chamber, the evaporating area is increased, and the working efficiency is improved;
3) In the secondary condenser; the first recovery tank collects condensed water passing through the first condenser and the second condenser and discharges the condensed water from the water outlet; delivering the gas not condensed by the first condenser to the second condenser through a second steam pipeline; the second recovery tank collects and transmits the condensed water discharged by the last stage heating device to the first recovery tank, and the condensed water is connected with the discharge port through the water outlet;
The multistage switching type feed liquid evaporator suitable for the evaporation method mainly comprises a heating device, an evaporation chamber, a circulating pump, a secondary condensing device, a first recovery tank, a second recovery tank, a vacuum pump and corresponding pipelines; wherein,
The heating device consists of a first-stage heater, a second-stage heater, a third-stage heater and a fourth-stage heater; the first-stage heater and the second-stage heater are connected in series to form a first group of heaters, the third-stage heater and the fourth-stage heater are connected in series to form a second group of heaters, and the two groups of heaters are connected in parallel and then are respectively connected with a feeding loop and a discharging loop of the evaporation chamber through a circulating pump:
The secondary condensing device comprises: comprises a first condenser, a first-stage circulating water inlet and a first-stage circulating water outlet; the second condenser, the second stage cooling water inlet and the second stage cooling water outlet; a first recovery tank and a second recovery tank;
the steam outlet of the evaporation chamber is connected with a first-stage condenser and a second condenser in series, and the first-stage condenser and the second condenser are respectively connected with a first recovery tank; the first recovery tank is connected with the condensate outlet of the first-stage heater to the fourth-stage heater after being connected with the second recovery tank in series;
the first-stage condenser is connected with the first-stage recovery tank through a first condensate pipeline;
the second-stage condenser is connected with the first-stage recovery tank through a second steam pipeline and a third condensate pipeline; the second condensate pipeline and the third condensate pipeline are connected in parallel;
the water outlet of the first recovery tank is connected with the discharge port;
the evaporation chamber is of a sealed tank structure, the side wall of the lower part is in an inclined cone shape, and the angle between the inclined cone and the vertical angle is 5-15 degrees; an annular flow dividing device is arranged at the upper part in the evaporation chamber, and the annular flow dividing device is of a hollow annular structure; a plurality of spraying small holes are uniformly distributed on the periphery of the circular ring to form an annular spraying pipe, the center of the circular ring is communicated with a cross pipeline, and the center of the pipeline is connected with a feeding loop at the top of the evaporation chamber; the bottom of the evaporating chamber is connected with a discharging loop, and a negative pressure environment lower than atmospheric pressure is formed in the evaporating chamber under the negative pressure effect of a vacuum pump on a steam outlet of the evaporating chamber.
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|---|---|---|---|---|
| DE956752C (en) * | 1952-11-04 | 1957-01-24 | Metallgesellschaft Ag | Process for the multi-stage evaporation of liquids containing salts or hardeners |
| SU1581336A1 (en) * | 1987-03-16 | 1990-07-30 | Всесоюзный Научно-Исследовательский Институт Химических Реактивов И Особо Чистых Химических Веществ | Climbing-film rotary evaporator |
| JPH06185745A (en) * | 1992-10-23 | 1994-07-08 | Toshiba Electric Appliance Co Ltd | Electrical heating appliance |
| JP3481530B2 (en) * | 1999-12-03 | 2003-12-22 | 川重冷熱工業株式会社 | Absorption chiller / heater |
| CN2651227Y (en) * | 2003-10-07 | 2004-10-27 | 南京工业大学 | Liquid caustic soda evaporation concentration device |
| DE102009012320A1 (en) * | 2009-03-09 | 2010-09-16 | Siemens Aktiengesellschaft | Flow evaporator |
| CN105126365A (en) * | 2015-08-17 | 2015-12-09 | 浙江森力机械科技股份有限公司 | Two-stage combined mechanical steam recompression concentrator |
| CN107638708B (en) * | 2017-11-06 | 2021-06-01 | 李少艳 | Series-parallel connection integrated multi-effect evaporator |
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2019
- 2019-06-04 CN CN201910479693.XA patent/CN110075557B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN210096958U (en) * | 2019-06-04 | 2020-02-21 | 吉林惠利现代轻工装备有限公司 | Multistage switching feed liquid evaporator |
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