CN216799736U

CN216799736U - Vacuum device for automatically adjusting vacuum degree of vacuum tail gas during vacuum breaking

Info

Publication number: CN216799736U
Application number: CN202123339478.1U
Authority: CN
Inventors: 周龙飞
Original assignee: Jiangsu Xinnong Chemical Co ltd
Current assignee: Jiangsu Xinnong Chemical Co ltd
Priority date: 2021-12-28
Filing date: 2021-12-28
Publication date: 2022-06-24
Anticipated expiration: 2031-12-28

Abstract

The utility model provides a vacuum device for automatically adjusting vacuum degree by vacuum tail gas vacuum breaking, which comprises a vacuum buffer tank, wherein an inlet pipe is connected at the inlet of the vacuum buffer tank, an inlet hand valve is arranged on the inlet pipe, an outlet pipe is connected at the outlet of the vacuum buffer tank, the outlet pipe is connected to a water tank through the outlet hand valve and a Roots pump, a return air port on the water tank is connected with the inlet of the vacuum buffer tank through a return air pipe, a vacuum breaking adjusting valve is arranged on the return air pipe, a nitrogen pipe is connected on the return air pipe, the nitrogen pipe is connected with a nitrogen tank through the nitrogen adjusting valve, a pressure transmitter and an oxygen content detector are connected on the vacuum buffer tank, and the oxygen content detector, the nitrogen adjusting valve, the pressure transmitter and the vacuum breaking adjusting valve are all connected with a microprocessor. The utility model has the beneficial effects that: the tail gas self-circulation meets the air-breaking requirement, the long-time nitrogen consumption is reduced, the energy is saved, and the risk of forming explosive mixed gas is reduced.

Description

Vacuum device for automatically adjusting vacuum degree of vacuum tail gas during vacuum breaking

Technical Field

The utility model belongs to the technical field of tail gas recycling and vacuum degree adjusting in chemical production, and particularly relates to a vacuum device for automatically adjusting vacuum degree by vacuum tail gas vacuum breaking.

Background

In chemical production, need operate under different vacuum degree environment during different solvent recovery, because vacuum pressure is less than atmospheric environment's pressure during its production, consequently when retrieving the tail gas that produces during solvent production, can't directly release to atmospheric environment in, consequently still need empty under vacuum environment, and be under the negative pressure environment, the pressure of the environment of emptying promptly can only be emptied vacuum tail gas smoothly than the pressure that produces tail gas department. At present, the vacuum pressure of the buffer tank is adjusted by breaking the vacuum degree (referred to as 'breaking' for short) through nitrogen under the condition of the same vacuum system, the production operation time is long, the consumption of the nitrogen is large, and the energy consumption of a nitrogen making unit is large, so the production cost is greatly improved by adopting the nitrogen to break and adjust the vacuum pressure of the buffer tank, and resources are wasted.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention provides a vacuum device for breaking vacuum of vacuum exhaust gas and automatically adjusting vacuum degree, so as to overcome the defects of the prior art.

In order to achieve the purpose, the technical scheme of the utility model is realized as follows:

the utility model provides a vacuum apparatus of broken empty automatically regulated vacuum of vacuum tail gas, including the vacuum buffer tank, the water tank, the nitrogen gas jar, the import department of vacuum buffer tank is connected with the intake pipe, be equipped with the hand valve that admits air in the intake pipe, the intake pipe is used for connecting production facility vacuum tail gas discharge end, the outlet duct is connected in the exit of vacuum buffer tank, the outlet duct loops through the hand valve that gives vent to anger, the roots pump is connected to the water tank, be equipped with return air inlet and drain on the water tank, the return air inlet passes through the access connection of muffler with the vacuum buffer tank, and be equipped with broken empty governing valve on the return air pipe, still be connected with the nitrogen gas pipe on the return air pipe, the nitrogen gas pipe is connected to the nitrogen gas jar that is equipped with nitrogen gas through nitrogen gas governing valve, be connected with pressure transmitter and oxygen content detector on the vacuum buffer tank, the oxygen content detector, the nitrogen gas governing valve, pressure transmitter and broken empty governing valve all are connected with microprocessor.

Furthermore, the nitrogen regulating valve and the air break regulating valve are both electrically operated valves.

Furthermore, an air inlet check valve is arranged on the air inlet pipe.

Furthermore, a degassing hand valve and a degassing check valve are arranged between the degassing hand valve and the roots pump on the gas outlet pipe.

Furthermore, the air return pipe is also provided with an air return check valve.

Further, still include centrifugal water pump, the pipeline that the water outlet end of the roots pump other end and centrifugal water pump is connected is all connected to the water tank through spraying the water gun.

Furthermore, a water pump check valve and a water pump water outlet hand valve are connected to a pipeline at the water outlet end of the centrifugal water pump, and a water pump water inlet hand valve is connected to a pipeline at the water inlet end of the centrifugal water pump.

Furthermore, a water filling port is also arranged on the water tank.

Furthermore, a vent pipe is connected to a vent opening on the water tank, and a flame arrester is connected to the vent pipe.

Furthermore, a sewage draining outlet is also arranged at the bottom of the vacuum buffer tank, a sewage draining pipe is connected at the sewage draining outlet, and a sewage draining hand valve is arranged on the sewage draining pipe.

Compared with the prior art, the utility model has the following advantages:

according to the vacuum device for automatically adjusting the vacuum degree of vacuum tail gas in the vacuum breaking manner, when the pressure transmitter detects that the pressure in the vacuum buffer tank is lower than a set threshold value, a part of tail gas discharged from the water tank is recycled to the vacuum buffer tank, the oxygen concentration in the vacuum buffer tank is detected through the oxygen content, and when the oxygen concentration in the vacuum buffer tank is higher than the set threshold value, nitrogen is automatically supplemented into the vacuum buffer tank, so that the safety in the vacuum buffer tank is ensured; the tail gas self-circulation meets the requirement of air breaking, the long-time nitrogen consumption is reduced, the energy is saved, and meanwhile, the risk of forming explosive mixed gas is reduced by automatically replenishing nitrogen through oxygen content detection.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:

fig. 1 is a schematic structural diagram of a vacuum device for breaking vacuum in vacuum tail gas and automatically adjusting vacuum degree according to an embodiment of the present invention.

Description of reference numerals:

1. a vacuum buffer tank; 2. a water tank; 3. an air inlet pipe; 4. an air inlet hand valve; 5. a vacuum tail gas discharge end of production equipment; 6. an air outlet pipe; 7. an air outlet hand valve; 8. a roots pump; 9. an air return port; 10. an air return pipe; 11. breaking the air adjusting valve; 12. a nitrogen gas pipe; 13. a nitrogen regulating valve; 14. a pressure transmitter; 15. an oxygen content detector; 16. an intake check valve; 17. a degassing hand valve; 18. a return air check valve; 19. a water jet gun; 20. a centrifugal water pump; 21. a water outlet hand valve of the water pump; 22. a water inlet hand valve of the water pump; 23. a water pump check valve; 24. a heat exchanger; 25. a water filling port; 26. a vent port; 27. a flame arrestor; 28. a blow-off pipe; 29. a blowdown hand valve; 30. a degassing check valve.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

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; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

As shown in the figure, a vacuum device for automatically adjusting vacuum degree by vacuum tail gas vacuum breaking, which comprises a vacuum buffer tank 1, a water tank 2 and a nitrogen tank, wherein an inlet of the vacuum buffer tank 1 is connected with an air inlet pipe 3, the air inlet pipe 3 is provided with an air inlet hand valve 4, the air inlet pipe 3 is used for being connected with a vacuum tail gas discharge end 5 of production equipment, an outlet of the vacuum buffer tank 1 is connected with an air outlet pipe 6, the air outlet pipe 6 sequentially passes through an air outlet hand valve 7 and a Roots pump 8 and is connected to the water tank 2, the water tank 2 is provided with an air return port 9 and a vent 26, the air return port 9 is connected with an inlet of the vacuum buffer tank 1 through an air return pipe 10, the air return pipe 10 is provided with a vacuum breaking adjusting valve 11, the air return pipe 10 is also connected with a nitrogen pipe 12, the nitrogen pipe 12 is connected to the nitrogen tank filled with nitrogen through a nitrogen adjusting valve 13, the vacuum buffer tank 1 is connected with a pressure transmitter 14 and an oxygen content detector 15, and the oxygen content detector 15, And the nitrogen regulating valve 13, the pressure transmitter 14 and the air break regulating valve 11 are all connected with the microprocessor. In this embodiment, vacuum tail gas exhausted by production equipment is filled into a vacuum buffer tank 1 for pressure buffering, tail gas buffered in the vacuum buffer tank 1 enters a water tank 2 under the action of a roots pump 8, part of the tail gas is recycled to the vacuum buffer tank 1 through an air return port 9 of the water tank 2, pressure change in the vacuum buffer tank 1 is detected through a pressure transmitter 14, when the pressure in the vacuum buffer tank 1 is lower than a preset pressure value, a microprocessor controls a vacuum breaking regulating valve 11 to adjust the opening and closing state of a valve, meanwhile, an oxygen concentration detector 15 detects the oxygen concentration in the vacuum buffer tank 1, and when the preset oxygen concentration value is reached, the microprocessor controls a nitrogen regulating valve 13 to open, and nitrogen is filled into the vacuum buffer tank 1.

The nitrogen regulating valve 13 and the air breaking regulating valve 11 are both electrically operated valves and are controlled by a microprocessor.

The air inlet pipe 3 is also provided with an air inlet check valve 16, and in the embodiment, the air inlet check valve 16 is positioned between the air inlet hand valve 4 and the production equipment.

A degassing hand valve 17 and a degassing check valve 30 are also arranged on the gas outlet pipe 6 between the gas outlet hand valve 7 and the roots pump 8.

The air return pipe 10 is also provided with an air return check valve 18.

The water tank is characterized by further comprising a centrifugal water pump 20, and pipelines connected with the other end of the roots pump 8 and the water outlet end of the centrifugal water pump 20 are connected to the water tank 2 through a water spraying gun 19.

The pipeline at the water outlet end of the centrifugal water pump 20 is connected with a water pump check valve 23 and a water pump water outlet hand valve 21, and the pipeline at the water inlet end of the centrifugal water pump 20 is connected with a water pump water inlet hand valve 22. In this embodiment, the water inlet end of the centrifugal water pump 20 is connected to the heat exchange port of the water tank 2 through the heat exchanger 24, and when the water temperature is too high, the heat exchanger 24 is started to cool the water in the water tank 2, so as to prevent the pressure in the water tank 2 from increasing due to high temperature; in the figure, PG denotes a pressure gauge, CWR denotes a return pipe, and CWS denotes a cooling water inlet pipe.

The water tank 2 is further provided with a water filling port 25, wherein DW represents a water filling pipe which is connected to the water filling port 25 and is used for adding process water or tap water.

The drain 26 department of water tank 2 is connected with the blow-down pipe, and VTb shows the blow-down pipe in the figure, is connected with spark arrester 27 on the blow-down pipe, and during the use, blow-down pipe end-to-end connection carries out tail gas treatment to subsequent tail gas processing apparatus. In this embodiment, a flame arrester 27 is used to prevent the tail gas from causing a fire due to static electricity. In this embodiment, a part of the tail gas generated in the water tank 2 is recycled to the vacuum buffer tank 1 through the return air port 9, and the other part of the tail gas is discharged through the vent 26, wherein the ratio of the tail gas generated in the former to the tail gas generated in the latter is about 1: 4.

The bottom of the vacuum buffer tank 1 is also provided with a sewage draining outlet, the sewage draining outlet is connected with a sewage draining pipe 28, and the sewage draining pipe 28 is provided with a sewage draining hand valve 29. Because the tail gas coming from the production equipment may have moisture, silted sewage is formed in the vacuum buffer tank 1, the vacuum buffer tank 1 can be cleaned at any time through a sewage discharge outlet, and the sewage is discharged into a wastewater disposal basin BD.

In the figure, the vacuum buffer tank 1 and the water tank 2 are further provided with a liquid level meter LG, which is the prior art and is irrelevant to the technical problem to be solved by the scheme, so that the specific connection structure and the use principle are not repeated herein.

The vacuum device of this embodiment can be widely used in the chemical production process to discharge the vacuum tail gas, for example, the recovery of the vacuum tail gas during the production of acetylfuran, and the production equipment in the vacuum tail gas discharge end 5 of the production equipment can be a reaction kettle, a receiving tank or a rectifying tower.

In this embodiment, the oxygen content detector 15 is of the type TFZO-5/10 TB; the model of the nitrogen regulating valve 13 is ZJHP-16P; the pressure transmitter 14 is JB3051DP model; the model of the air breaking regulating valve 11 is ZJHP-16P; the microprocessor is S7-200 PLC in model.

The working process of the embodiment is as follows:

and opening a water outlet hand valve 21 of the water pump, a water inlet hand valve 22 of the water pump, a degassing hand valve 17, a degassing hand valve 7 and a gas inlet hand valve 4, then starting the centrifugal water pump 20, enabling the vacuum tail gas discharge end 5 of the production equipment to enter the vacuum buffer tank 1, and starting the roots pump 8 when the pressure of the vacuum buffer tank 1 reaches a preset pressure value to finish the starting of the whole vacuum system.

The centrifugal water pump 20 pumps water in the water tank 2 out and enters the water tank 2 again through the water spraying gun 19 to form water circulation, water exists in the form of high-pressure water flow in the process, vacuum tail gas is driven to enter the water tank 2 at the position of the water spraying gun 19, a part of vacuum tail gas is discharged from the vent 26, the other part of vacuum tail gas is pulled back to the vacuum buffer tank 1, and the vacuum tail gas is used for breaking the vacuum buffer tank 1 according to a detection result; the pressure transmitter 14 sends the detected pressure change in the vacuum buffer tank 1 to the microprocessor, and when the detected pressure is smaller than a preset pressure value, the microprocessor controls the air breaking regulating valve 11 to be opened, so that a part of tail gas in the water tank 2 is recycled from the air return port 9 to the vacuum buffer tank 1 through the air return pipe 10 to supplement the pressure in the vacuum buffer tank 1; the oxygen content detector 15 sends the detected oxygen concentration change in the vacuum buffer tank 1 to the microprocessor, and when the detected oxygen concentration is greater than a preset oxygen concentration value, the microprocessor controls the nitrogen regulating valve 13 to be opened, nitrogen is filled into the vacuum buffer tank 1, and the internal oxygen concentration is reduced.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. The utility model provides a broken vacuum apparatus of empty automatically regulated vacuum of vacuum tail gas which characterized in that: including the vacuum buffer tank, the water tank, the nitrogen gas jar, the import department of vacuum buffer tank is connected with the intake pipe, be equipped with the hand valve that admits air in the intake pipe, the intake pipe is used for connecting production facility vacuum exhaust emission end, the outlet duct is connected in the exit of vacuum buffer tank, the outlet duct loops through the hand valve of giving vent to anger, the roots pump is connected to the water tank, be equipped with return air inlet and drain on the water tank, the return air inlet passes through the access connection of return air pipe with the vacuum buffer tank, and be equipped with broken empty governing valve on the return air pipe, still be connected with the nitrogen gas pipe on the return air pipe, the nitrogen gas pipe is connected to the nitrogen gas jar that is equipped with nitrogen gas through nitrogen gas governing valve, be connected with pressure transmitter and oxygen content detector on the vacuum buffer tank, oxygen content detector, nitrogen gas governing valve, pressure transmitter and broken empty governing valve all are connected with microprocessor.

2. The vacuum device for automatically adjusting the vacuum degree of vacuum tail gas during vacuum tail gas vacuum breaking according to claim 1, is characterized in that: the nitrogen regulating valve and the air breaking regulating valve are both electrically operated valves.

3. The vacuum device for automatically adjusting the vacuum degree of vacuum tail gas during vacuum tail gas vacuum breaking according to claim 1, is characterized in that: the air inlet pipe is also provided with an air inlet check valve.

4. The vacuum device for automatically adjusting the vacuum degree of vacuum tail gas during vacuum tail gas vacuum breaking according to claim 1, is characterized in that: a degassing hand valve and a degassing check valve are also arranged between the degassing hand valve and the roots pump on the gas outlet pipe.

5. The vacuum device for automatically adjusting the vacuum degree of vacuum tail gas during vacuum tail gas vacuum breaking according to claim 1, is characterized in that: the air return pipe is also provided with an air return check valve.

6. The vacuum device for automatically adjusting the vacuum degree of vacuum tail gas during vacuum tail gas vacuum breaking according to claim 4, is characterized in that: still include centrifugal water pump, the pipeline that the water outlet end of the roots pump other end and centrifugal water pump is connected is all connected to the water tank through spraying the water gun.

7. The vacuum device for automatically adjusting the vacuum degree of vacuum tail gas during vacuum tail gas vacuum breaking according to claim 6, is characterized in that: the pipeline at the water outlet end of the centrifugal water pump is connected with a water pump check valve and a water pump water outlet hand valve, and the pipeline at the water inlet end of the centrifugal water pump is connected with a water pump water inlet hand valve.

8. The vacuum device for automatically adjusting the vacuum degree of vacuum tail gas during vacuum tail gas vacuum breaking according to claim 1, is characterized in that: the water tank is also provided with a water filling port.

9. The vacuum device for automatically adjusting the vacuum degree of vacuum tail gas during vacuum tail gas vacuum breaking according to claim 1, is characterized in that: and an emptying pipe is connected at an emptying port on the water tank, and a flame arrester is connected on the emptying pipe.

10. The vacuum device for automatically adjusting the vacuum degree of vacuum tail gas during vacuum tail gas vacuum breaking according to claim 1, is characterized in that: the bottom of the vacuum buffer tank is also provided with a sewage draining outlet, the sewage draining outlet is connected with a sewage draining pipe, and a sewage draining hand valve is arranged on the sewage draining pipe.