Efficient and energy-saving vacuumizing system

Abstract

The utility model discloses an efficient and energy-saving vacuumizing system which comprises a first dry vacuum pump, a second dry vacuum pump, a first steam-jet pump, a second steam-jet pump, a third steam-jet pump, a fourth steam-jet pump, a first dry vacuum condenser, a second dry vacuum condenser, a steam-jet pump condenser, a power source and a controller. Air inlets of the first steam-jet pump, the second steam-jet pump, the third steam-jet pump and the fourth steam-jet pump are respectively connected with a benzene separation tower, a benzene recovery tower and a cyclohexene separation tower, an outlet of the steam-jet pump is connected with a condenser of the steam-jet pump to recover condensed liquid, and a gas phase is collected to a process discharge header; and the other outlet is used for being connected with a dry vacuum pump condenser, and a gas phase is collected to a process discharge header. According to the utility model, the dry vacuum pump and the steam jet pump are combined, so that the medium-pressure steam consumption of the device is reduced, the steam consumption in the production cost of a ton of products is finally reduced, the production cost is reduced, the stable operation of the device is maintained, and the economic benefit is better.

Description

Technical Field

[0001] This utility model relates to the field of chemical equipment technology, and in particular to a high-efficiency and energy-saving vacuum system. Background Technology

[0002] Currently, distillation columns are widely used in chemical production. They are key equipment for achieving efficient, energy-saving, environmentally friendly, and safe chemical production. The rational design and optimization of distillation column operation are crucial for improving the overall level of chemical production. In the KA oil production process, the separation processes of the 200# benzene separation column, benzene recovery column, cyclohexene separation column, and cyclohexene refining column are mainly carried out through negative pressure distillation columns. The KA oil unit currently significantly reduces the boiling point of the materials by lowering the system pressure, thus reducing heating requirements, saving energy and improving separation efficiency. The KA oil unit consumes 120 t / h of steam during daily production. Steam consumption directly determines the overall production cost. With continuous technological innovation over the years, the KA oil unit has achieved comprehensive heat recovery and utilization. However, the current high-pressure steam consumption in the steam jet pump vacuum system is approximately 2 t / h. The oily, high-temperature condensate generated after the jet pump is directly discharged into the oily wastewater tank, resulting in low heat utilization efficiency and energy waste. There is an urgent need to improve the current situation by adopting a more efficient vacuum system. Utility Model Content

[0003] The purpose of this invention is to provide a highly efficient and energy-saving vacuum system. Considering the operating conditions of the 200# distillation column, which requires a certain level of vacuum to maintain a negative pressure state, a new dry vacuum pump system is added. One outlet of the distillation column is connected to a steam jet pump, and the outlet of the steam jet pump is connected to the steam jet pump condenser for liquid recovery. The vapor phase is collected in the process discharge manifold. The other outlet is connected to the dry vacuum pump condenser, and the outlet of the dry vacuum pump condenser is connected to the dry vacuum pump, with the vapor phase collected in the process discharge manifold. The two outlets are connected in parallel and can be switched according to actual conditions. This technical modification of the vacuum system of the KA oil unit's distillation column, combining a dry vacuum pump with a steam jet pump, reduces the medium-pressure steam consumption in the unit, ultimately reducing steam consumption per ton of product production cost, lowering production costs, maintaining stable unit operation, and resulting in good economic benefits.

[0004] The technical solution adopted in this utility model is as follows:

[0005] A high-efficiency and energy-saving vacuum system includes a first dry vacuum pump, a second dry vacuum pump, a first steam jet pump, a second steam jet pump, a third steam jet pump, a fourth steam jet pump, a first dry vacuum condenser, a second dry vacuum condenser, a steam jet pump condenser, a power supply, and a controller. The inlets of the first, second, third, and fourth steam jet pumps are respectively connected to the corresponding first outlets of a benzene separation tower, a benzene recovery tower, a cyclohexene separation tower, and a cyclohexene refining tower. The corresponding second outlets of the benzene separation tower, benzene recovery tower, and cyclohexene separation tower are simultaneously connected to the inlet of the first dry vacuum condenser. The second outlet of the cyclohexene refining tower is connected to the inlet of the second dry vacuum condenser. The outlets of the first and second dry vacuum condensers are respectively connected to the inlets of the first and second dry vacuum pumps. The power supply provides power to all components, and the controller controls the start and stop of each component.

[0006] It also includes a first manifold regulating valve, a second manifold regulating valve, a third manifold regulating valve, and a fourth manifold regulating valve for controlling the amount of process exhaust gas returned to the distillation column to maintain the negative pressure of the distillation column. The first manifold regulating valve, the second manifold regulating valve, the third manifold regulating valve, and the fourth manifold regulating valve are respectively installed at the corresponding discharge ports of the benzene recovery column, the cyclohexene separation column, and the cyclohexene refining column. The control input terminals of the first manifold regulating valve, the second manifold regulating valve, the third manifold regulating valve, and the fourth manifold regulating valve are connected to the output terminal of the controller.

[0007] It also includes a first fixed pump inlet regulating valve, a second fixed pump inlet regulating valve, a third fixed pump inlet regulating valve, and a fourth fixed pump inlet regulating valve, used to control the frequency of the dry vacuum pump to adjust the amount of gas from the distillation column to the process exhaust gas. The first fixed pump inlet regulating valve, the second fixed pump inlet regulating valve, the third fixed pump inlet regulating valve, and the fourth fixed pump inlet regulating valve are respectively installed on the corresponding first gas outlet of the benzene separation column, the benzene recovery column, the cyclohexene separation column, and the cyclohexene refining column. The control input terminals of the first fixed pump inlet regulating valve, the second fixed pump inlet regulating valve, the third fixed pump inlet regulating valve, and the fourth fixed pump inlet regulating valve are connected to the output terminal of the controller.

[0008] It also includes a fifth fixed pump inlet regulating valve. A connecting pipe is provided between the air inlets of the first dry vacuum condenser and the second dry vacuum condenser. The fifth fixed pump inlet regulating valve is installed on the connecting pipe, and the control input terminal of the fifth fixed pump inlet regulating valve is connected to the output terminal of the controller.

[0009] This invention combines a dry vacuum pump with a steam jet pump, thereby reducing the consumption of high-pressure steam in the device and ultimately reducing the amount of steam consumed per ton of product, thus lowering production costs and maintaining stable operation of the device, resulting in good economic benefits. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is the electrical schematic diagram of this utility model. Detailed Implementation

[0012] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0013] like Figure 1 As shown, this utility model includes a first dry vacuum pump 1, a second dry vacuum pump 2, a first steam jet pump 7, a second steam jet pump 8, a third steam jet pump 9, a fourth steam jet pump 10, a first dry vacuum condenser 12, a second dry vacuum condenser 13, a steam jet pump condenser 11, a power supply, and a controller; the air inlets of the first steam jet pump 7, the second steam jet pump 8, the third steam jet pump 9, and the fourth steam jet pump 10 are respectively used to connect to the corresponding first air outlets of the benzene separation tower 3, the benzene recovery tower 4, the cyclohexene separation tower 5, and the cyclohexene refining tower 6. The benzene separation tower 3, benzene recovery tower 4, and cyclohexene separation tower 5 are connected to the inlet of the first dry vacuum condenser 12 at their respective second outlets. The second outlet of the cyclohexene refining tower 6 is connected to the inlet of the second dry vacuum condenser 13. The outlets of the first dry vacuum condenser 12 and the second dry vacuum condenser 13 are respectively connected to the inlets of the first dry vacuum pump 1 and the second dry vacuum pump 2. The power supply is used to power each component, and the controller is used to control the start and stop of each component.

[0014] It also includes a first manifold regulating valve PIC-201, a second manifold regulating valve PIC-202, a third manifold regulating valve PIC-203, and a fourth manifold regulating valve PIC-204 for controlling the amount of process exhaust gas returned to the distillation column to maintain the negative pressure of the distillation column. The first manifold regulating valve PIC-201, the second manifold regulating valve PIC-202, the third manifold regulating valve PIC-203, and the fourth manifold regulating valve PIC-204 are respectively installed at the corresponding discharge ports of the benzene separation column 3, the benzene recovery column 4, the cyclohexene separation column 5, and the cyclohexene refining column 6. The control input terminals of the first manifold regulating valve PIC-201, the second manifold regulating valve PIC-202, the third manifold regulating valve PIC-203, and the fourth manifold regulating valve PIC-204 are connected to the output terminal of the controller.

[0015] It also includes a first fixed pump inlet regulating valve PCV-271, a second fixed pump inlet regulating valve PCV-272, a third fixed pump inlet regulating valve PCV-273, and a fourth fixed pump inlet regulating valve PCV-274, used to control the gas flow rate of the dry vacuum pump and adjust the gas flow rate from the distillation tower to the process exhaust gas. The first fixed pump inlet regulating valve PCV-271, the second fixed pump inlet regulating valve PCV-272, the third fixed pump inlet regulating valve PCV-273, and the fourth fixed pump inlet regulating valve PCV-274 are respectively installed at the corresponding first gas outlets of the benzene separation tower 3, the benzene recovery tower 4, the cyclohexene separation tower 5, and the cyclohexene refining tower 6. The control input terminals of the first fixed pump inlet regulating valve PCV-271, the second fixed pump inlet regulating valve PCV-272, the third fixed pump inlet regulating valve PCV-273, and the fourth fixed pump inlet regulating valve PCV-274 are connected to the output terminal of the controller.

[0016] It also includes a fifth fixed pump inlet regulating valve PCV-275. A connecting pipe is also provided between the air inlets of the first dry vacuum condenser 12 and the second dry vacuum condenser 13. The fifth fixed pump inlet regulating valve PCV-275 is installed on the connecting pipe. The control input terminal of the fifth fixed pump inlet regulating valve PCV-275 is connected to the output terminal of the controller.

[0017] In practical use, the top gas phase outlet of the benzene separation tower 3 is connected to the discharge port. One outlet is connected to the benzene separation tower steam jet pump 7, and the other outlet of the benzene separation tower steam jet pump 7 is connected to the first dry vacuum pump condenser 12. The outlet of the first dry vacuum pump condenser 12 is connected to the first dry vacuum pump 1. The gas phase is collected into the process discharge manifold. Since the negative pressures of the benzene separation tower 3, cyclohexene separation tower 5, and cyclohexene refining tower 6 are similar, it is considered to use one first dry vacuum pump 1 for vacuuming. The benzene recovery tower 4 requires a lower negative pressure, so a second dry vacuum pump 2 is used alone. The cyclohexene separation tower 5 and cyclohexene refining tower 6 are similar to those of the benzene separation tower 3. The top vapor outlet of benzene recovery tower 4 is connected to the discharge port. One outlet is connected to the second steam jet pump 8, and the outlet of the second steam jet pump 8 is connected to the steam jet pump condenser 11 for liquid condensation recovery. The vapor phase is collected in the process discharge manifold. The other outlet is connected to the second dry vacuum pump condenser 13, and the outlet of the second dry vacuum pump condenser 13 is connected to the second dry vacuum pump 2. The vapor phase is collected in the process discharge manifold. The two outlets are connected in parallel through a connecting pipe and switched according to actual conditions. The four distillation towers share the steam jet pump condenser 11.

[0018] During the operation of the steam jet pump, the negative pressure of the distillation column may fluctuate due to the fluctuation of medium-pressure steam with the fluctuation of utility works. The amount of process exhaust gas returning to the distillation column is controlled by the process discharge manifold regulating valves PIC-201, PIC-202, PIC-203, and PIC-204 to maintain the negative pressure of the distillation column. During the operation of the dry vacuum pump, the intake air volume of the dry vacuum pump is controlled by fixed pump inlet regulating valves (PCV-271, PCV-272, PCV-273, and PCV-274), which in turn adjusts the amount of gas flowing from the distillation column to the process exhaust gas. This, combined with the control of the amount of process exhaust gas returning to the distillation column by process exhaust manifold regulating valves (PIC-201, PIC-202, PIC-203, and PIC-204), maintains the negative pressure in the distillation column. Initially, a steam jet pump is used to draw negative pressure; once stable, the dry vacuum pump can be switched to. However, a steam jet pump and a dry vacuum pump should not be used simultaneously in the same distillation column. The inlets of the first dry vacuum pump 1 and the second dry vacuum pump 2 are controlled by the fifth fixed pump inlet regulating valve PCV-275. When one of them fails, the fifth fixed pump inlet regulating valve PCV-275 is opened in time to maintain the original negative pressure operation of the distillation column.

[0019] In the description of this invention, it should be noted that directional terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this invention.

[0020] It should be noted that the terms "comprising" and "having" and any variations thereof in the specification and claims of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0021] Note that the above description is merely a preferred embodiment and application of the technical principles of the present invention. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the specific embodiments described herein, and may include many other effective embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A high efficiency energy saving vacuum pumping system, characterized in that, It comprises a first dry vacuum pump, a second dry vacuum pump, a first steam jet pump, a second steam jet pump, a third steam jet pump, a fourth steam jet pump, a first dry vacuum condenser, a second dry vacuum condenser, a steam jet pump condenser, a power supply and a controller; the gas inlets of the first steam jet pump, the second steam jet pump, the third steam jet pump and the fourth steam jet pump are respectively connected with the corresponding first gas outlets of the benzene separation tower, the benzene recovery tower, the cyclohexene separation tower and the cyclohexene refining tower, the second gas outlets of the benzene separation tower, the benzene recovery tower and the cyclohexene separation tower are connected with the gas inlet of the first dry vacuum condenser, the second gas outlet of the cyclohexene refining tower is connected with the gas inlet of the second dry vacuum condenser, the gas outlets of the first dry vacuum condenser and the second dry vacuum condenser are respectively connected with the gas inlets of the first dry vacuum pump and the second dry vacuum pump; the power supply is used for supplying power to each component, and the controller is used for controlling the start and stop of each component.

2. The high efficiency energy saving vacuum pumping system as claimed in claim 1, wherein, It also comprises a first manifold regulating valve, a second manifold regulating valve, a third manifold regulating valve and a fourth manifold regulating valve for controlling the amount of process exhaust gas returned to the rectification tower to maintain the negative pressure of the rectification tower, the first manifold regulating valve, the second manifold regulating valve, the third manifold regulating valve and the fourth manifold regulating valve are respectively arranged on the corresponding discharge outlets of the benzene recovery tower, the cyclohexene separation tower and the cyclohexene refining tower, and the control input ends of the first manifold regulating valve, the second manifold regulating valve, the third manifold regulating valve and the fourth manifold regulating valve are connected with the output end of the controller.

3. The high efficiency energy saving vacuum pumping system as claimed in claim 1, wherein, It also comprises a first fixed pump inlet regulating valve, a second fixed pump inlet regulating valve, a third fixed pump inlet regulating valve and a fourth fixed pump inlet regulating valve for controlling the frequency adjustment of the dry vacuum pump to the amount of gas from the rectification tower to the process exhaust gas, the first fixed pump inlet regulating valve, the second fixed pump inlet regulating valve, the third fixed pump inlet regulating valve and the fourth fixed pump inlet regulating valve are respectively arranged on the corresponding first gas outlets of the benzene separation tower, the benzene recovery tower, the cyclohexene separation tower and the cyclohexene refining tower, and the control input ends of the first fixed pump inlet regulating valve, the second fixed pump inlet regulating valve, the third fixed pump inlet regulating valve and the fourth fixed pump inlet regulating valve are connected with the output end of the controller.

4. The high efficiency energy saving vacuum pumping system as claimed in claim 1, wherein, It also comprises a fifth fixed pump inlet regulating valve, a communication pipeline is arranged between the gas inlets of the first dry vacuum condenser and the second dry vacuum condenser, the fifth fixed pump inlet regulating valve is arranged on the communication pipeline, and the control input end of the fifth fixed pump inlet regulating valve is connected with the output end of the controller.

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