CN215463277U

CN215463277U - Cyclohexane oxidation tail gas comprehensive treatment device

Info

Publication number: CN215463277U
Application number: CN202120745725.9U
Authority: CN
Inventors: 夏碧波; 姜雨土; 王建辉; 朱杰; 付文英; 刘周平
Original assignee: QUZHOU JUHUA POLYAMIDE FIBRE LLC
Current assignee: QUZHOU JUHUA POLYAMIDE FIBRE LLC
Priority date: 2021-04-13
Filing date: 2021-04-13
Publication date: 2022-01-11
Anticipated expiration: 2031-04-13

Abstract

The utility model discloses a cyclohexane oxidation tail gas comprehensive treatment device which comprises an air compressor, a heat exchanger, a heater, a catalytic oxidation reactor, a boiler, an expansion generator and a chimney, wherein an outlet of the air compressor is connected with a tail gas inlet of the heat exchanger, a tail gas outlet of the heat exchanger is connected with an inlet of the heater, an outlet of the heater is connected with an inlet of the catalytic oxidation reactor, an outlet of the catalytic oxidation reactor is connected with a purified gas inlet of the heat exchanger, a purified gas outlet of the heat exchanger is connected with a purified gas inlet of the boiler, a purified gas outlet of the boiler is connected with a purified gas inlet of the expansion generator, and a purified gas outlet of the expansion generator is connected with an inlet of the chimney. The utility model has the advantages of simple structure, high organic matter removing efficiency and low energy consumption.

Description

Cyclohexane oxidation tail gas comprehensive treatment device

Technical Field

The utility model relates to a tail gas treatment device, in particular to a cyclohexane oxidation tail gas comprehensive treatment device.

Background

Cyclohexane oxidation is an important step in the manufacture of KA oil and adipic acid, typically using air as the oxidant. Because the air contains a large amount of inert gases (mainly nitrogen) which do not participate in the reaction, the oxidized tail gas contains a plurality of organic components including raw materials, solvents, reaction byproducts and the like, the organic components are required to be recovered and the gas is required to be purified, and the exhaust gas can be discharged to the environment after reaching the emission standard. The process flow for recovering the organic components in the cyclohexane oxidation tail gas is to recycle part of useful organic components such as cyclohexane, cyclohexanol and the like from the tail gas by a tail gas absorption tower. The purity of nitrogen in the tail gas after passing through the tail gas absorption tower is more than 97%, but the tail gas still contains a small amount of components harmful to the environment, such as n-butane, n-pentane, propane, cyclopropane, cyclohexane, cyclohexanone, cyclohexanol and the like, and direct emptying can generate certain influence on the environment and cause energy waste, so that how to purify and treat the low-concentration organic waste gas becomes a universal problem.

Chinese patent No. CN208406622U discloses a cyclohexanone tail gas treatment device, which heats the cyclohexanone tail gas and then enters an expander to expand for power generation; and the expanded tail gas is treated by the oxidation reactor, and the tail gas is directly discharged after reaching the standard. However, in the method, extra heat is needed to heat cyclohexanone tail gas at the inlet of the expansion machine, extra energy for supplementing fuel is needed in the catalytic oxidation reaction, and the treatment cost is high.

Chinese patent publication No. CN106362548A discloses a method for treating oxidation tail gas in the process of producing cyclohexanone by cyclohexane oxidation, which converts part of energy into electric energy for recovery by adding a water absorption tower and an expander. However, the method has the defect that a large amount of energy is consumed in the wastewater treatment process after the alcohol ketone is absorbed by the water absorption tower, the treatment effect of the method is not ideal, and the organic matter content in the treated tail gas often exceeds the standard and cannot be discharged after reaching the standard.

Chinese patent publication No. CN107469615A discloses a purification and treatment method for cyclohexanone oxidized tail gas, which comprises adsorbing organic matters in cyclohexanone tail gas by an adsorption device, and then catalytically oxidizing the tail gas to perform expansion power generation. However, because the content of organic matters in the desorption gas is extremely low, a large amount of energy is consumed for treating and adsorbing the desorption gas, the regenerated high-concentration waste gas still needs to be treated, and the energy consumption of the device is high.

Disclosure of Invention

Aiming at the defects in the prior art, the utility model provides the comprehensive treatment device for the cyclohexane oxidation tail gas, which has the advantages of simple structure, high organic matter removal efficiency and low energy consumption.

In order to achieve the purpose, the utility model adopts the technical scheme that: a cyclohexane oxidation tail gas integrated processing device, includes air compressor, heat exchanger, heater, catalytic oxidation reactor, boiler, expansion generator and chimney, air compressor's export with the tail gas access connection of heat exchanger, the tail gas export of heat exchanger with the access connection of heater, the export of heater with the access connection of catalytic oxidation reactor, the export of catalytic oxidation reactor with the purified gas access connection of heat exchanger, the purified gas export of heat exchanger with the purified gas access connection of boiler, the purified gas export of boiler with the purified gas access connection of expansion generator, the purified gas export of expansion generator with the access connection of chimney.

As a preferred embodiment of the utility model, the catalytic oxidation reactor is a fixed bed reactor.

In a preferred embodiment of the present invention, the heater is an electric heater

As a preferred embodiment of the utility model, the heat exchanger is a shell-and-tube heat exchanger

In a preferred embodiment of the present invention, the air compressor is a centrifugal compressor or a piston compressor

In the utility model, after the cyclohexane oxidation tail gas is mixed with air, the mixture enters a heat exchanger of a subsequent process, exchanges heat with the hot tail gas which is discharged from the catalytic oxidation reactor and is subjected to organic matter removal, and further exchanges heat with a boiler, so that the utilization rate of energy is improved, the hot tail gas is rapidly cooled, and the working temperature of the expansion generator is reached.

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

1. the method has the advantages that the energy consumption is low, the economic benefit is good, the reaction of removing organic matters in cyclohexane oxidation tail gas in the catalytic oxidation reactor is continuously carried out by self heat release, the high-temperature and high-pressure gas obtained after the reaction is introduced into the heat exchanger to preheat the mixed gas of the cyclohexane oxidation tail gas and air, then the mixed gas enters the boiler to heat hot water to obtain by-product low-pressure steam, the temperature of the hot tail gas after being further cooled reaches the ideal working condition of the expansion generator to drive the expansion generator to generate electricity, the high-pressure kinetic energy of the cyclohexane oxidation tail gas and the organic matter components are fully recycled, the energy consumption is reduced, and the economic benefit is improved.

2. The organic matter removing efficiency is high, the organic matter removing capability for removing n-butane, n-pentane, propane, cyclopropane, cyclohexane, cyclohexanone, cyclohexanol and the like in the tail gas is deeper, and the treated tail gas meets the emission standard of the tail gas.

3. Simple structure, operation elasticity is big, and the handling capacity is big, is showing the investment and the running cost who have reduced the device.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

In the figure: the device comprises an air compressor 1, a heat exchanger 2, a heater 3, a catalytic oxidation reactor 4, a boiler 5, an expansion generator 6 and a chimney 7.

Detailed Description

As shown in FIG. 1, the cyclohexane oxidation tail gas comprehensive treatment device comprises an air compressor 1, a heat exchanger 2, a heater 3, a catalytic oxidation reactor 4, a boiler 5, an expansion generator 6 and a chimney 7, wherein an outlet of the air compressor 1 is connected with a tail gas inlet of the heat exchanger 2, a tail gas outlet of the heat exchanger 2 is connected with a tail gas inlet of the heater 3, a tail gas outlet of the heat exchanger 3 is connected with an inlet of the catalytic oxidation reactor 4, an outlet of the catalytic oxidation reactor 4 is connected with a purified gas inlet of the heat exchanger 2, a purified gas outlet of the heat exchanger 2 is connected with a purified gas inlet of the boiler 5, a purified gas outlet of the boiler 5 is connected with a purified gas inlet of the expansion generator 6, and a purified gas outlet of the expansion generator 6 is connected with an inlet of the chimney 7.

The technological process of comprehensively treating cyclohexane oxidation tail gas by using the device comprises the following steps: mixing the cyclohexane oxidation tail gas with air compressed by an air compressor 1 to obtain mixed gas, enabling the mixed gas to enter a heat exchanger 2 to exchange heat with the high-temperature and high-pressure tail gas which is discharged from a catalytic oxidation reactor 4 and is subjected to organic matter removal, and increasing the temperature of the cyclohexane oxidation tail gas after heat exchange; the cyclohexane oxidation tail gas after heat exchange enters a heater 3 for heating, the temperature of the cyclohexane oxidation tail gas is further increased and then enters a catalytic oxidation reactor 4, organic matters are removed under the action of a catalyst, the high-temperature and high-pressure tail gas after the organic matters are removed enters a heat exchanger 2 and is subjected to heat exchange with the cyclohexane oxidation tail gas with lower temperature newly entering the heat exchanger 2, the temperature is reduced, the hot tail gas obtained after temperature reduction enters a boiler 5 and exchanges heat with hot water entering the boiler 5, the hot water is heated into low-pressure steam, the hot tail gas is further cooled to an ideal working condition of an expansion generator 6, enters the expansion generator 6 to drive the expansion generator 6 to generate electricity, and the electricity is discharged through a chimney 7 after reaching the standard.

The present invention is described in further detail by way of examples, but the present invention is not limited thereto, and any simple changes, equivalent substitutions or modifications made on the basis of the present invention to achieve substantially the same technical effects are included in the scope of the present invention.

Example 1

The cyclohexane oxidation tail gas comprehensive treatment device comprises an air compressor 1 (centrifugal type, type TA-50MN4R2/30) and a heat exchanger 2 (pipe)Shell type heat exchanger, Φ 800, H4158, F112.4 m²) Heater 3 (electric heater, 400KW, silicon controlled rectifier adjusts), catalytic oxidation reactor 4 (fixed bed reactor), boiler 5, expansion generator 6 and chimney 7, air compressor 1's export and heat exchanger 2's tail gas access connection, heat exchanger 2's tail gas export and heater 3's tail gas access connection, heat exchanger 3's tail gas export and catalytic oxidation reactor 4's access connection, catalytic oxidation reactor 4's export and heat exchanger 2's purification gas access connection, heat exchanger 2's purification gas export and boiler 5's purification gas access connection, boiler 5's purification gas export and expansion generator 6's purification gas access connection, expansion generator 6's purification gas export and chimney 7's access connection.

Example 2

The cyclohexane oxidation tail gas comprehensive treatment equipment includes air compressor 1 (piston type, model LW-30/15) and heat exchanger 2 (shell-and-tube type heat exchanger, phi is 1000, F is 120.4m²) Heater 3 (electric heater, 500KW, silicon controlled rectifier adjusts), catalytic oxidation reactor 4 (fixed bed reactor), boiler 5, expansion generator 6 and chimney 7, air compressor 1's export and heat exchanger 2's tail gas access connection, heat exchanger 2's tail gas export and heater 3's tail gas access connection, heat exchanger 3's tail gas export and catalytic oxidation reactor 4's access connection, catalytic oxidation reactor 4's export and heat exchanger 2's purification gas access connection, heat exchanger 2's purification gas export and boiler 5's purification gas access connection, boiler 5's purification gas export and expansion generator 6's purification gas access connection, expansion generator 6's purification gas export and chimney 7's access connection.

Example 3

The cyclohexane oxidation tail gas comprehensive treatment equipment includes air compressor 1 (centrifugal type, model TA-50MN4R2/30) and heat exchanger 2 (shell-and-tube heat exchanger, phi is 600, F is 85.4m²) Heater 3 (electric heater, 300KW, silicon controlled rectifier regulation), catalytic oxidation reactor 4 (fixed bed reactor), boiler 5, expansion generator 6 and chimney 7, air compressor 1's export and heat exchanger 2's tail gas access connection, heat exchanger 2's tail gas export and heater 3's tail gas access connection, heat exchanger 3's tail gas export and heater 3's tail gasThe inlet of the catalytic oxidation reactor 4 is connected, the outlet of the catalytic oxidation reactor 4 is connected with the purified gas inlet of the heat exchanger 2, the purified gas outlet of the heat exchanger 2 is connected with the purified gas inlet of the boiler 5, the purified gas outlet of the boiler 5 is connected with the purified gas inlet of the expansion generator 6, and the purified gas outlet of the expansion generator 6 is connected with the inlet of the chimney 7.

Example 4

The cyclohexane oxidation tail gas comprehensive treatment equipment includes air compressor 1 (piston type, model LW-30/15) and heat exchanger 2 (shell-and-tube type heat exchanger, phi is 1200, F is 140m²) Heater 3 (electric heater, 500KW, silicon controlled rectifier adjusts), catalytic oxidation reactor 4 (fixed bed reactor), boiler 5, expansion generator 6 and chimney 7, air compressor 1's export and heat exchanger 2's tail gas access connection, heat exchanger 2's tail gas export and heater 3's tail gas access connection, heat exchanger 3's tail gas export and catalytic oxidation reactor 4's access connection, catalytic oxidation reactor 4's export and heat exchanger 2's purification gas access connection, heat exchanger 2's purification gas export and boiler 5's purification gas access connection, boiler 5's purification gas export and expansion generator 6's purification gas access connection, expansion generator 6's purification gas export and chimney 7's access connection.

Claims

1. A cyclohexane oxidation tail gas integrated processing device, includes air compressor, heat exchanger, heater, catalytic oxidation reactor, boiler, expansion generator and chimney, its characterized in that, the export of air compressor with the tail gas inlet of heat exchanger connect, the tail gas export of heat exchanger with the inlet of heater connect, the export of heater with the inlet of catalytic oxidation reactor connect, the export of catalytic oxidation reactor with the clean gas inlet of heat exchanger connect, the clean gas export of heat exchanger with the clean gas inlet of boiler connect, the clean gas export of boiler with the clean gas inlet of expansion generator connect, the clean gas export of expansion generator with the inlet of chimney connect.

2. The comprehensive treatment device for the cyclohexane oxidation tail gas according to claim 1, characterized in that the catalytic oxidation reactor is a fixed bed reactor.

3. The integrated cyclohexane oxidation tail gas treatment device according to claim 1, characterized in that the heater is an electric heater.

4. The comprehensive cyclohexane oxidation tail gas treatment device according to claim 1, wherein the heat exchanger is a shell-and-tube heat exchanger.

5. The integrated cyclohexane oxidation tail gas treatment device according to claim 1, characterized in that the air compressor is a centrifugal compressor or a piston compressor.