CN218266341U

CN218266341U - Organic solvent steam low-pressure recovery vacuum unit

Info

Publication number: CN218266341U
Application number: CN202222101881.9U
Authority: CN
Inventors: 何敏剑; 周君斐; 高仙华
Original assignee: Zhejiang Fangyuanlixin Vacuum Equipment Co ltd
Current assignee: Zhejiang Fangyuanlixin Vacuum Equipment Co ltd
Priority date: 2022-08-10
Filing date: 2022-08-10
Publication date: 2023-01-10
Anticipated expiration: 2032-08-10

Abstract

The utility model relates to an organic solvent steam low pressure recovery vacuum unit, including first roots vacuum pump, second roots vacuum pump, third roots vacuum pump, buffer tank, screw vacuum pump, vapour and liquid separator, condenser and the filter that communicates in proper order, first roots vacuum pump still is connected with the recycling drum, the recycling drum including the ponding jar and with the first liquid pipe that first roots vacuum pump is connected, the side of ponding jar is provided with first drain outlet, the bottom of first liquid pipe is located the below of first drain outlet. Compared with the prior art, the utility model provides a recovery drum is used for retrieving the condensate of condensation in the first roots vacuum pump, and the liquid outlet of first liquid pipe is located the liquid level below for the condensate is restricted in first liquid pipe down with vacuum pumping system's contact, thereby significantly reduced can produce the liquid surface area of flash evaporation, reduces the flash evaporation, need not additional cooling device, thereby reduces recovery cost.

Description

Organic solvent steam low-pressure recovery vacuum unit

Technical Field

The utility model relates to a vacuum unit is retrieved to organic solvent steam low pressure belongs to vacuum unit technical field.

Background

A vacuum unit for retrieving solvent includes the hydrops mechanism that is connected with the pump, and hydrops mechanism simple structure among the prior art appears the phenomenon of condensate secondary evaporation easily at the in-process of retrieving the solvent to increase vacuum unit's load. In order to prevent secondary evaporation of the condensate, a cooling device is additionally arranged on the liquid accumulating mechanism, but the production cost is greatly increased.

SUMMERY OF THE UTILITY MODEL

The utility model aims at the shortcoming of prior art, provide a reduce organic solvent steam low pressure recovery vacuum unit of condensate secondary evaporation.

For realizing the purpose the utility model adopts the technical proposal that:

the organic solvent steam low-pressure recovery vacuum unit comprises a first roots vacuum pump, a second roots vacuum pump, a third roots vacuum pump, a buffer tank, a screw vacuum pump, a gas-liquid separator, a condenser and a filter which are sequentially communicated, wherein the first roots vacuum pump is further connected with a recovery barrel, the recovery barrel comprises a liquid accumulation tank and a first liquid discharge pipe connected with the first roots vacuum pump, a first liquid discharge port is formed in the side surface of the liquid accumulation tank, the bottom of the first liquid discharge pipe is located below the first liquid discharge port, steam enters the first roots vacuum pump, and condensate in the first roots vacuum pump enters the liquid accumulation tank through the first liquid discharge pipe, then enters the recovery barrel and is discharged through the first liquid discharge port.

As a further optimization of the above technical solution: the recycling device is characterized in that a vent hole is formed in the pipe wall of the first liquid dropping pipe, the vent hole is located in the liquid accumulation tank and close to the top of the liquid accumulation tank, when condensate is received in the liquid accumulation tank, the liquid level is located below the vent hole, a gas release port is formed in the recycling cylinder, and a gas release valve is installed in the gas release port.

As a further optimization of the above technical solution: the buffer tank is provided with an air inlet pipe and an air outlet pipe, the top of the air inlet pipe extends out of the buffer tank and is connected with the third Roots vacuum pump, one end of the air outlet pipe penetrates through the inner wall of the buffer tank and is located in the buffer tank, and the other end of the air outlet pipe extends out of the buffer tank and is connected with the screw vacuum pump.

As a further optimization of the above technical solution: the end part of the air inlet pipe, which is positioned in the buffer tank, is provided with an oblique notch.

As a further optimization of the above technical solution: the oblique incision is directed to the left.

As a further optimization of the above technical solution: still be provided with the baffle in the buffer tank, the upper surface of baffle is located the below of outlet duct, and be located the notched top of slant, the baffle is fan-shaped, the side system of baffle has the direction inclined plane, be equipped with the second stalk on the inner wall of buffer tank, the second stalk is located the below of baffle, the mouth of pipe of second stalk with the end on direction inclined plane contacts.

As a further optimization of the above technical solution: the utility model discloses a condenser, including screw vacuum pump, buffer tank, condenser, cooling water jacket, third leakage fluid dram, pneumatic valve is installed to the buffer tank with install between the screw vacuum pump, the buffer tank with the condenser is all through cooling water, the outside cover of buffer tank is equipped with cooling water jacket, be provided with the third leakage fluid dram on the buffer tank, install the third leakage fluid dram on the third leakage fluid dram, open the third leakage fluid dram, the condensate in the buffer tank passes through the third leakage fluid dram discharges.

As a further optimization of the above technical solution: condensate condensed in the condenser flows back to the gas-liquid separator, a second liquid discharge port is formed in the gas-liquid separator, a second liquid discharge valve is installed in the second liquid discharge port and opened, the condensate in the gas-liquid separator is discharged through the second liquid discharge port, and uncondensed steam in the condenser enters the filter and is discharged.

As a further optimization of the above technical solution: install first drainage valve in the first drainage mouth, open first drainage valve, the condensate in the recovery section of thick bamboo passes through first drainage mouth discharges.

Compared with the prior art, the recovery cylinder is used for recovering condensed fluid condensed in the first Roots vacuum pump, and the liquid outlet of the first lower liquid pipe is positioned below the liquid level, so that the contact between the condensed fluid and the vacuum pumping system is limited in the first lower liquid pipe, and the liquid level area capable of generating secondary evaporation is greatly reduced; and evaporation needs to absorb heat, and due to the limitation of the first liquid descending pipe, the cold and hot convection effect generated between liquid in the pipe and the periphery is greatly reduced, the heat absorption caused by the contact of the liquid in the pipe and the outside is also limited, the secondary evaporation is further reduced, an additional cooling device is not needed, and the recovery cost is reduced.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic structural diagram of a middle part structure of the present invention.

Fig. 3 is a schematic view of the sectional structure of the buffer tank of the present invention.

Fig. 4 is a schematic sectional view of another angle of the buffer tank of the present invention.

Fig. 5 is a schematic sectional structure diagram of the recycling bin of the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the following detailed description. As shown in fig. 1 to 5, the organic solvent vapor low-pressure recovery vacuum unit comprises a first roots vacuum pump 1, a second roots vacuum pump 2, a third roots vacuum pump 3, a buffer tank 4, a screw vacuum pump 5, a gas-liquid separator 6, a condenser 7 and a filter 8 which are sequentially communicated, wherein the condenser 7 and the filter 8 are omitted in fig. 2. The steam enters the first roots vacuum pump 1. The first roots vacuum pump 1 is also connected with a recovery cylinder 9, and condensate in the first roots vacuum pump 1 enters the recovery cylinder 9. Cooling water passes through both the gas-liquid separator 6 and the condenser 7. The buffer tank 4, the gas-liquid separator 6 and the recovery drum 9 discharge the condensate. The condensate condensed in the condenser 7 is refluxed to the gas-liquid separator 6. And a second liquid discharge port is formed in the gas-liquid separator 6, a second liquid discharge valve 61 is installed in the second liquid discharge port, the second liquid discharge valve 61 is opened, and condensate in the gas-liquid separator 6 is discharged through the second liquid discharge port. The steam that is not condensed in the condenser 7 enters the filter 8 and is discharged.

In the above technical scheme: the recovery drum 9 includes a liquid accumulation tank 91 and a first lower liquid pipe 92 connected to the first roots vacuum pump 1. As shown in fig. 5, a tube wall of the first downcomer 92 is formed with a vent hole 93, and the vent hole 93 is located in the accumulated liquid tank 91 near the top of the accumulated liquid tank 91. When the liquid is received in the liquid accumulation tank 91, the liquid surface must be positioned below the vent hole 93. When the condensate flows into the liquid accumulation tank 91 through the first downcomer 92, the space above the liquid surface in the liquid accumulation tank 91 is reduced, the pressure rises, and the liquid surface in the first downcomer 92 and the liquid surface in the liquid accumulation tank 91 form a liquid level difference to prevent the liquid from flowing into the liquid accumulation tank 91, so that the vent hole 93 is provided to discharge the gas in the liquid accumulation tank 91 and outside the first downcomer 92.

In the above technical scheme: the side of the liquid accumulation tank 91 is further provided with a first liquid discharge port, a first liquid discharge valve 95 is installed in the first liquid discharge port, the first liquid discharge valve 95 is opened, and condensate in the recovery cylinder 9 is discharged and recovered through the first liquid discharge port. The bottom of the first downcomer 92 is located below the first drain port. In a vacuum environment, secondary evaporation is easily generated by the condensate, so that the load of a vacuum unit is increased. The bottom of the first liquid-discharging pipe 92 is located below the first liquid-discharging opening, that is, the liquid-discharging opening of the first liquid-discharging pipe 92 is located below the liquid level, at this time, the contact of the condensate with the vacuum-pumping system can be limited in the first liquid-discharging pipe 92, so that the liquid level area capable of generating the secondary evaporation is greatly reduced. And the evaporation needs to absorb heat, and due to the limitation of the first lower liquid pipe 92, the cold and heat convection effect generated between the liquid in the pipe and the periphery is greatly reduced, the heat absorption caused by the contact between the liquid in the pipe and the outside is also limited, the secondary evaporation is further reduced, and an additional cooling device is not needed, so that the production cost is reduced.

In the above technical scheme: the top of the recovery cylinder 9 is provided with an air release port, and an air release valve 94 is arranged in the air release port.

In the above technical scheme: as shown in fig. 2, 3 and 4, the buffer tank 4 is provided with an inlet pipe 41, an outlet pipe 42 and a third drain port. The top of the air inlet pipe 41 extends out of the buffer tank 4 and is connected with the third roots vacuum pump 3. One end of the air outlet pipe 42 penetrates through the inner wall of the buffer tank 4 and is positioned in the buffer tank 4, and the other end of the air outlet pipe 42 extends out of the buffer tank 4 and is connected with the screw vacuum pump 5. One end of the air outlet pipe 42 is positioned in the buffer tank 4, so that the cooling liquid moving along the inner wall surface of the buffer tank 4 under the action of centrifugal force can be effectively reduced from entering the air outlet pipe 42. The third drain port is located at the bottom of the buffer tank 4, and a third drain valve 43 is mounted on the third drain port. The third drain valve 43 is opened, and the condensate in the buffer tank 4 is discharged through the third drain port and recovered.

In the above technical scheme: the end of the inlet pipe 41 in the surge tank 4 is formed with an oblique slit 44. As shown, the oblique incision 44 faces to the left side in the present invention. The oblique notches 44 can increase the sectional area of the outlet, so that the gas has the effect of diffusing and discharging towards the left and the lower, the initial speed of the discharged gas flow is favorably reduced, the gas flow can be guided to collide with the inner wall of the shell on the left side, and the deposition rate of the cooling liquid is favorably improved; the lower space of the buffer tank 4 can form a circular channel, so that the air flow does circular motion along the inner walls of two sides of the buffer tank 4, and the deposition rate of the liquid can be improved by utilizing centrifugal force.

In the above technical scheme: a baffle plate 45 is further arranged in the buffer tank 4, and the upper surface of the baffle plate 45 is positioned below the air outlet pipe 42 and above the oblique notch 44. The partition plate 45 is in a fan shape, and a circle of guide inclined surface 46 is formed on the side surface of the partition plate 45. The inner wall of the buffer tank 4 is provided with a second liquid descending pipe 47, the second liquid descending pipe 47 is positioned below the partition plate 45, and the pipe orifice of the second liquid descending pipe 47 is contacted with the tail end of the guide inclined plane 46. The partition plate 45 separates the inlet pipe 41 and the outlet pipe 42, so that an upper space and a lower space are formed inside the buffer tank 4. The partition plate 45 enables the upper channel to be a circular channel, enables the airflow to move along the circumferences of the channels on the two sides, enables liquid in the airflow to move outwards under the action of centrifugal force, can increase the number of times that the liquid collides the wall, and improves the liquid deposition rate; the symmetrical flow channels on the two sides can enable the air flows to form the effect of mutual opposite impact at the inlet of the air outlet pipe 42, thereby being beneficial to reducing the energy of the air flows and improving the deposition rate of the cooling liquid. The guide slope 46 enables the condensate on the inner wall of the upper space of the buffer tank 4 to be gathered at the junction between the partition plate 45 and the inner wall of the buffer tank 4, the condensate flows into the bottom liquid accumulation pool through the second liquid descending pipe 47, meanwhile, the condensate can be enabled to be far away from the main force of the exhaust airflow, and the condensate is reduced to be discharged by the airflow.

In the above technical scheme: the outside of the buffer tank 4 is sleeved with a cooling water jacket 48. A pneumatic valve 10 is arranged between the buffer tank 4 and the screw vacuum pump 5.

The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the teachings of the present invention without undue experimentation. Therefore, all technical personnel in this technical field rely on the utility model discloses a conceive technical scheme that can obtain through logic analysis, reasoning or limited experiment on prior art's basis, all should fall into the utility model discloses a within the scope of protection.

Claims

1. The organic solvent steam low-pressure recovery vacuum unit is characterized by comprising a first roots vacuum pump (1), a second roots vacuum pump (2), a third roots vacuum pump (3), a buffer tank (4), a screw vacuum pump (5), a gas-liquid separator (6), a condenser (7) and a filter (8) which are sequentially communicated, wherein the first roots vacuum pump (1) is further connected with a recovery cylinder (9), the recovery cylinder (9) comprises a liquid accumulation tank (91) and a first liquid drainage pipe (92) connected with the first roots vacuum pump (1), a first liquid drainage port is formed in the side face of the liquid accumulation tank (91), the bottom of the first liquid drainage pipe (92) is located below the first liquid drainage port, steam enters the first roots vacuum pump (1), and condensate in the first roots vacuum pump (1) enters the liquid accumulation tank (91) through the first liquid drainage pipe (92) and then is discharged through the first liquid drainage port.

2. The vacuum unit for low-pressure recovery of organic solvent vapor according to claim 1, characterized in that a vent hole (93) is formed on a tube wall of the first downcomer (92), the vent hole (93) is located in the liquid accumulation tank (91) and close to the top of the liquid accumulation tank (91), when condensate is received in the liquid accumulation tank (91), a liquid level is located below the vent hole (93), a vent hole is formed in the recovery cylinder (9), and a vent valve (94) is installed in the vent hole.

3. The vacuum unit for low-pressure recovery of organic solvent vapor according to claim 1 or 2, wherein the buffer tank (4) is provided with an air inlet pipe (41) and an air outlet pipe (42), the top of the air inlet pipe (41) extends out of the buffer tank (4) and is connected with the third roots vacuum pump (3), one end of the air outlet pipe (42) penetrates through the inner wall of the buffer tank (4) and is positioned in the buffer tank (4), and the other end of the air outlet pipe (42) extends out of the buffer tank (4) and is connected with the screw vacuum pump (5).

4. The vacuum unit for low-pressure recovery of organic solvent vapor according to claim 3, characterized in that the end of the air inlet pipe (41) in the buffer tank (4) is provided with an oblique cut (44).

5. The vacuum machine set for low pressure recovery of organic solvent vapor according to claim 4, wherein the oblique cut (44) is toward the left side.

6. The vacuum unit for low-pressure recovery of organic solvent vapor according to claim 4, wherein a partition plate (45) is further disposed in the buffer tank (4), an upper surface of the partition plate (45) is located below the air outlet pipe (42) and above the inclined cut (44), the partition plate (45) is fan-shaped, a guide inclined surface (46) is formed on a side surface of the partition plate (45), a second liquid outlet pipe (47) is disposed on an inner wall of the buffer tank (4), the second liquid outlet pipe (47) is located below the partition plate (45), and an opening of the second liquid outlet pipe (47) contacts with a terminal of the guide inclined surface (46).

7. The vacuum unit for low-pressure recovery of organic solvent vapor according to claim 1, characterized in that a pneumatic valve (10) is installed between the buffer tank (4) and the screw vacuum pump (5), the buffer tank (4) and the condenser (7) both pass through cooling water, a cooling water jacket (48) is sleeved outside the buffer tank (4), a third liquid discharge port is arranged on the buffer tank (4), a third liquid discharge valve (43) is installed on the third liquid discharge port, the third liquid discharge valve (43) is opened, and condensate in the buffer tank (4) is discharged through the third liquid discharge port;

condensate condensed in the condenser (7) flows back to the gas-liquid separator (6), a second liquid discharge port is formed in the gas-liquid separator (6), a second liquid discharge valve (61) is installed in the second liquid discharge port, the second liquid discharge valve (61) is opened, the condensate in the gas-liquid separator (6) is discharged through the second liquid discharge port, and uncondensed steam in the condenser (7) enters the filter (8) and is discharged;

install first drainage valve (95) in the first drainage port, open first drainage valve (95), the condensate in recovery section of thick bamboo (9) passes through first drainage port discharges.