Thin film evaporation equipment

Abstract

The utility model relates to the field of evaporation equipment, in particular to film evaporation equipment which comprises a scraper film evaporator, the lower end of the scraper film evaporator is connected with a cooling kettle through a discharging pipe, a feeding pipe is arranged on the side wall of the scraper film evaporator, and a conveying pump is arranged on the feeding pipe. The end, away from the scraper film evaporator, of the feeding pipe is connected with a preheating tank, a raw material inlet pipe is arranged at the upper end of the preheating tank, a steam outlet pipe is arranged at the upper end of the scraper film evaporator, and a first-stage condenser is arranged at the end, away from the scraper film evaporator, of the steam outlet pipe. And the lower end of the primary condenser is connected with a first fraction receiving tank through a first receiving pipe. The device has the effect of reducing the damage of long-time heating to materials with high heat sensitivity.

Description

Technical Field

[0001] The present application relates to the field of evaporation equipment, and in particular to a thin film evaporation equipment. Background Art

[0002] The scraper film evaporator is a shell with a heating steam jacket on the outside and a rotatable scraper inside, which is driven by the rotating shaft in the center of the cylinder. After the raw liquid is added tangentially from the top of the evaporator, it forms a downward rotating film along the inner wall of the shell under the drive of gravity and the rotating scraper. The finished liquid is discharged from the bottom discharger, and the secondary steam is discharged from the top after passing through the demister. The outstanding advantage of this evaporator is that it has a strong adaptability to materials and is suitable for the evaporation of high-viscosity, easy-to-crystallize, easy-to-scale, containing suspended matter or heat-sensitive liquids.

[0003] The utility model patent with publication number CN219885731U discloses a continuous evaporation and distillation production system for methanol-containing high-COD wastewater, including a wastewater raw liquid tank, the bottom of which is connected to the upper part of a scraped film evaporator via a feed pump, the liquid phase outlet pipe at the bottom of the scraped film evaporator is connected to a concentration kettle, a residue outlet is arranged at the bottom of the concentration kettle, the top of the concentration kettle is connected to a wastewater intermediate tank via a concentration condenser, the gas phase outlet pipe at the top of the scraped film evaporator is connected to the upper part of a distillation tower, the bottom of the distillation tower is connected to the wastewater intermediate tank via a tower bottom pump and a tower bottom condenser, the top of the distillation tower is connected to a reflux tank via a tower top condenser, the bottom of the reflux tank is divided into two paths via a reflux pump, and the two paths are connected to the methanol intermediate tank and the upper part of the distillation tower respectively via a methanol recovery flow control valve and a return liquid flow control valve.

[0004] When the distillation production system distills the material, it is necessary to heat the material in the scraped film evaporator to a higher temperature and maintain the temperature for a certain period of time. However, some fractions have high thermal sensitivity and will be damaged if they are maintained at high temperature for too long. Utility Model Content

[0005] In order to reduce the damage caused by long-term heating to materials with high heat sensitivity, the present application provides a thin film evaporation device.

[0006] The thin film evaporation equipment provided in this application adopts the following technical solution:

[0007] A thin film evaporation device comprises a scraped film evaporator, wherein the lower end of the scraped film evaporator is connected to a cooling kettle via a discharge pipe, a feed pipe is arranged on the side wall of the scraped film evaporator, a delivery pump is arranged on the feed pipe, a preheating tank is connected to the end of the feed pipe away from the scraped film evaporator, a raw material inlet pipe is arranged at the upper end of the preheating tank, a steam outlet pipe is arranged at the upper end of the scraped film evaporator, a primary condenser is arranged at the end of the steam outlet pipe away from the scraped film evaporator, and the lower end of the primary condenser is connected to a first fraction receiving tank via a first receiving pipe.

[0008] By adopting the above technical scheme, the material is added into the preheating tank through the feed pipe for heating, the heated material is transported to the scraper film evaporator through the feed pipe by the delivery pump for evaporation, the evaporated fraction is transported to the primary condenser through the steam outlet pipe for cooling, the cooled fraction is collected by the first fraction receiving tank, the mother liquor remaining after evaporation is discharged into the cooling kettle through the discharge pipe for collection, the material is first heated in the preheating tank, so that the residence time of the material in the scraper film evaporator is shorter, the time the material is in a high temperature environment is reduced, and the damage of long-term heating to the material with high heat sensitivity is reduced.

[0009] Optionally, the preheating tank is covered with a jacket, the jacket is hollow, a hot water inlet pipe and a hot water outlet pipe are provided on the side wall of the jacket, and a flow valve is provided on the hot water inlet pipe.

[0010] By adopting the above technical solution, the operator opens the flow valve, hot water flows into the jacket through the hot water inlet pipe, the jacket filled with hot water heats the reactor, and the heated hot water flows out through the hot water outlet pipe. The flow rate of the hot water can be controlled by the flow valve, thereby controlling the heating degree of the jacket.

[0011] Optionally, a thermometer is provided on the feed pipe, the thermometer is electrically connected to a controller and sends the temperature value of the material in the feed pipe to the controller, a cut-off valve is provided on the hot water inlet pipe, the controller is electrically connected to the cut-off valve, and the controller closes the cut-off valve when the temperature value is higher than a set value.

[0012] By adopting the above technical solution, when the temperature of the material in the reactor is too high, the controller closes the shut-off valve, reduces the hot water flowing into the jacket, reduces the heating effect of the jacket on the reactor, and reduces the temperature of the material in the reactor, so that the temperature of the material in the reactor is maintained near the set value.

[0013] Optionally, a pressure relief valve is provided at the upper end of the preheating tank.

[0014] By adopting the above technical solution, the material will partially evaporate when heated in the preheating tank, which increases the air pressure in the preheating tank. When the air pressure in the preheating tank reaches the set value, the pressure relief valve opens and discharges part of the gas, so that the air pressure in the preheating tank is maintained within a certain range, thereby protecting the preheating tank.

[0015] Optionally, a first receiving tube and a second receiving tube are provided at the lower end of the primary condenser, and a second fraction receiving tank is provided at one end of the second receiving tube away from the primary condenser.

[0016] By adopting the above technical solution, when the first fraction receiving tank receives fractions to a certain extent, the operator closes the first receiving tube and opens the second receiving tube, and uses the second fraction receiving tank to continue receiving fractions, thereby increasing the fraction storage capacity.

[0017] Optionally, a main receiving tube is provided at the lower end of the primary condenser, a three-way valve is provided at the lower end of the main receiving tube, and two interfaces at the lower end of the three-way valve are respectively connected to the first receiving tube and the second receiving tube.

[0018] By adopting the above technical solution, the operator can conveniently open or close the first receiving tube and the second receiving tube by switching the three-way valve.

[0019] Optionally, the upper ends of the first fraction receiving tank and the second fraction receiving tank are both connected to a first exhaust pipe, and a vacuum pump is provided at one end of the first exhaust pipe away from the first fraction receiving tank.

[0020] By adopting the above technical solution, the interior of the equipment is in a negative pressure state when the vacuum pump is working. The negative pressure state will reduce the boiling point of the material, making it easier for the material to evaporate at a lower temperature, thereby reducing the damage to the material caused by high temperature.

[0021] Optionally, a secondary condenser is provided at the end of the first exhaust pipe away from the first fraction receiving tank, a second exhaust pipe is provided at the upper end of the secondary condenser, a vacuum buffer tank is provided at the end of the second exhaust pipe away from the secondary condenser, a vacuum tube is provided on the side wall of the vacuum buffer tank, and the end of the vacuum tube away from the vacuum buffer tank is connected to a vacuum pump.

[0022] By adopting the above technical solution, the gas extracted from the first fraction receiving tank and the second fraction receiving tank is cooled by the secondary condenser, and the fraction is collected by the vacuum buffer tank, thereby reducing the amount of fraction drawn into the vacuum pump and protecting the vacuum pump.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. The material is first heated in the preheating tank, so that the material stays in the scraped film evaporator for a shorter time, reducing the time the material is in a high temperature environment and reducing the damage of long-term heating to materials with high heat sensitivity;

[0025] 2. The flow rate of hot water can be controlled by the flow valve, thereby controlling the heating degree of the jacket;

[0026] 3. When the vacuum pump is working, the inside of the equipment is in a negative pressure state. The negative pressure state will reduce the boiling point of the material, making it easier for the material to evaporate at a lower temperature, thereby reducing the damage to the material caused by high temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of a thin film evaporation device according to an embodiment of the present application.

[0028] Figure 2 It is a structural schematic diagram of a preheating tank of a thin film evaporation device in an embodiment of the present application.

[0029] Explanation of the reference numerals in the accompanying drawings: 1. preheating tank; 11. feed pipe; 12. delivery pump; 13. thermometer; 14. pressure relief valve; 15. raw material inlet pipe; 16. controller; 2. scraped film evaporator; 21. steam outlet pipe; 3. cooling kettle; 31. discharge pipe; 4. primary condenser; 41. main receiving pipe; 42. three-way valve; 43. first receiving pipe; 44. first fraction receiving tank; 45. second receiving pipe; 46. second fraction receiving tank; 5. jacket; 51. hot water inlet pipe; 511. flow valve; 512. shut-off valve; 52. hot water outlet pipe; 6. secondary condenser; 61. first exhaust pipe; 62. second exhaust pipe; 7. vacuum buffer tank; 71. vacuum tube; 72. vacuum pump. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1-2 This application is described in further detail.

[0031] The present application embodiment discloses a thin film evaporation device. Figure 1 A thin film evaporation device includes a preheating tank 1, the upper end of the preheating tank 1 is connected to a raw material inlet pipe 15 for adding materials into the preheating tank 1, the preheating tank 1 is covered with a hollow jacket 5, the side wall of the jacket 5 is connected to a hot water inlet pipe 51 and a hot water outlet pipe 52, the hot water inlet pipe 51 is connected to the lower end of the jacket 5, the hot water outlet pipe 52 is connected to the upper end of the jacket 5, a flow valve 511 and a cut-off valve 512 are installed on the hot water inlet pipe 51, the flow valve 511 is used to control the flow rate of hot water, the hot water flows into the jacket 5 so that the jacket 5 can heat the preheating tank 1, and a pressure relief valve 14 is installed on the upper end of the preheating tank 1. When the material is heated in the preheating tank 1, it will partially evaporate, so that the air pressure in the preheating tank 1 increases. When the air pressure in the preheating tank 1 reaches the set value, the pressure relief valve 14 opens and discharges part of the gas, so that the air pressure in the preheating tank 1 is maintained within a certain range, thereby protecting the preheating tank 1.

[0032] Reference Figure 1 as well as Figure 2The lower end of the preheating tank 1 is connected to a feed pipe 11, and one end of the feed pipe 11 away from the preheating tank 1 is connected to the side wall of the scraped film evaporator 2. A delivery pump 12 and a thermometer 13 are installed on the feed pipe 11. The thermometer 13 is electrically connected to a controller 16 and sends the temperature value of the material in the feed pipe 11 to the controller 16. The controller 16 is electrically connected to the shut-off valve 512. The controller 16 closes the shut-off valve 512 when the temperature value is higher than the set value, so that the temperature of the material in the preheating tank 1 is maintained within a certain range.

[0033] Reference Figure 1 as well as Figure 2 The lower end of the scraped film evaporator 2 is connected to a discharge pipe 31, and the lower end of the discharge pipe 31 is connected to a cooling kettle 3. The upper end of the scraped film evaporator 2 is connected to a steam outlet pipe 21, and one end of the steam outlet pipe 21 away from the scraped film evaporator 2 is connected to the upper end of the primary condenser 4, and the lower end of the primary condenser 4 is connected to a main receiving pipe 41, and a three-way valve 42 is installed at the lower end of the main receiving pipe 41. The two interfaces at the lower end of the three-way valve 42 are respectively connected to a first receiving pipe 43 and a second receiving pipe 45, and the lower end of the first receiving pipe 43 is connected to a first distillate receiving tank 44, and the lower end of the second receiving pipe 45 is connected to a second distillate receiving tank 46. By switching the three-way valve 42, the first receiving pipe 43 and the second receiving pipe 45 can be conveniently opened or closed, thereby switching to use the first distillate receiving tank 44 or the second distillate receiving tank 46 to receive the distillate.

[0034] Reference Figure 1 The upper ends of the first fraction receiving tank 44 and the second fraction receiving tank 46 are connected to the first exhaust pipe 61, and one end of the first exhaust pipe 61 away from the first fraction receiving tank 44 and the second fraction receiving tank 46 is connected to the lower end of the secondary condenser 6. The upper end of the secondary condenser 6 is connected to the vacuum buffer tank 7 through the second exhaust pipe 62, and the vacuum buffer tank 7 is connected to the vacuum pump 72 through the vacuum pipe 71. When the vacuum pump 72 is working, the inside of the equipment is in a negative pressure state. The negative pressure state will reduce the boiling point of the material, making it convenient for the material to evaporate at a lower temperature, thereby reducing the damage to the material caused by high temperature.

[0035] The implementation principle of a thin film evaporation device in an embodiment of the present application is as follows: material is added into the preheating tank 1 through the feed pipe 11, hot water flows into the jacket 5 through the hot water inlet pipe 51, the jacket 5 filled with hot water heats the reactor, and the heated hot water flows out through the hot water outlet pipe 52. The flow rate of the hot water can be controlled by the flow valve 511, thereby controlling the heating degree of the jacket 5. The heated material is transported to the scraped thin film evaporator 2 through the feed pipe 11 by the delivery pump 12 for evaporation, and the evaporated fraction is transported to the primary condenser 4 through the steam outlet pipe 21 for cooling. The cooled fraction is collected through the first fraction receiving tank 44 or the second fraction receiving tank 46, and the remaining mother liquor is discharged into the cooling kettle 3 through the discharge pipe 31 for collection. The material is first heated in the preheating tank 1, so that the residence time of the material in the scraped thin film evaporator 2 is short, the time the material is in a high temperature environment is reduced, and the damage of long-term heating to materials with high heat sensitivity is reduced.

[0036] When the material is distilled, the vacuum pump 72 works so that the inside of the equipment is in a negative pressure state. The negative pressure state will reduce the boiling point of the material, making it easier for the material to evaporate at a lower temperature, thereby reducing the damage to the material caused by high temperature. The gas extracted from the first fraction receiving tank 44 and the second fraction receiving tank 46 is cooled by the secondary condenser 6, and the distillate is collected by the vacuum buffer tank 7, thereby reducing the amount of distillate drawn into the vacuum pump 72, thereby protecting the vacuum pump 72.

[0037] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A thin film evaporation device, characterized in that: The invention comprises a scraped film evaporator (2), wherein the lower end of the scraped film evaporator (2) is connected to a cooling kettle (3) via a discharge pipe (31), a feed pipe (11) is provided on the side wall of the scraped film evaporator (2), a delivery pump (12) is provided on the feed pipe (11), an end of the feed pipe (11) away from the scraped film evaporator (2) is connected to a preheating tank (1), an upper end of the preheating tank (1) is provided with a raw material inlet pipe (15), an upper end of the scraped film evaporator (2) is provided with a steam outlet pipe (21), an end of the steam outlet pipe (21) away from the scraped film evaporator (2) is provided with a primary condenser (4), and the lower end of the primary condenser (4) is connected to a first fraction receiving tank (44) via a first receiving pipe (43).

2. A thin film evaporation device according to claim 1, characterized in that: The preheating tank (1) is provided with a jacket (5), the jacket (5) being hollow, a hot water inlet pipe (51) and a hot water outlet pipe (52) being provided on the side wall of the jacket (5), and a flow valve (511) being provided on the hot water inlet pipe (51).

3. A thin film evaporation device according to claim 2, characterized in that: The feed pipe (11) is provided with a thermometer (13), the thermometer (13) is electrically connected to a controller (16) and transmits the temperature value of the material in the feed pipe (11) to the controller (16), the hot water feed pipe (51) is provided with a shut-off valve (512), the controller (16) is electrically connected to the shut-off valve (512), and the controller (16) closes the shut-off valve (512) when the temperature value is higher than a set value.

4. The thin film evaporation device according to claim 1, characterized in that: A pressure relief valve (14) is provided at the upper end of the preheating tank (1).

5. The thin film evaporation device according to claim 1, characterized in that: A first receiving tube (43) and a second receiving tube (45) are provided at the lower end of the primary condenser (4); a second fraction receiving tank (46) is provided at one end of the second receiving tube (45) away from the primary condenser (4).

6. A thin film evaporation device according to claim 5, characterized in that: A main receiving pipe (41) is provided at the lower end of the primary condenser (4), a three-way valve (42) is provided at the lower end of the main receiving pipe (41), and two interfaces at the lower end of the three-way valve (42) are respectively connected to the first receiving pipe (43) and the second receiving pipe (45).

7. A thin film evaporation device according to claim 6, characterized in that: The upper ends of the first fraction receiving tank (44) and the second fraction receiving tank (46) are both connected to a first exhaust pipe (61), and a vacuum pump (72) is provided at one end of the first exhaust pipe (61) away from the first fraction receiving tank (44).

8. A thin film evaporation device according to claim 7, characterized in that: A secondary condenser (6) is provided at one end of the first exhaust pipe (61) away from the first fraction receiving tank (44); a second exhaust pipe (62) is provided at the upper end of the secondary condenser (6); a vacuum buffer tank (7) is provided at one end of the second exhaust pipe (62) away from the secondary condenser (6); a vacuum pipe (71) is provided on the side wall of the vacuum buffer tank (7); and the end of the vacuum pipe (71) away from the vacuum buffer tank (7) is connected to a vacuum pump (72).

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