CN112573713A

CN112573713A - High-concentration organic wastewater wet catalytic oxidation treatment device and use method thereof

Info

Publication number: CN112573713A
Application number: CN202011528356.4A
Authority: CN
Inventors: 陈广鹏; 柳陈军
Original assignee: Quanzhou Zhongtian Petrochemical Machinery Manufacturing Co ltd
Current assignee: Quanzhou Zhongtian Petrochemical Machinery Manufacturing Co ltd
Priority date: 2020-12-22
Filing date: 2020-12-22
Publication date: 2021-03-30

Abstract

The invention discloses a wet catalytic oxidation treatment device for high-concentration organic wastewater and a use method in the technical field of wastewater, and the device comprises an air compressor, a compressed air buffer tank, a heat conducting oil system, a wastewater buffer tank, a wastewater filter, a wastewater delivery pump, a reactor, a steam buffer tank, a flash tank and a tail water delivery pump; the treatment cost is low, the COD removal effect is good, and the occupied area is small; the initial wastewater does not need to be diluted and can be directly used for treating high-concentration organic wastewater of over 35000 mg/L; the effluent of the device does not need to be diluted or subjected to secondary biochemical treatment, and can be directly discharged after reaching the standard; the heat conducting oil heating area is arranged on the surface of the reactor, and the heat exchanger and the reactor are combined together, so that the equipment investment can be reduced; energy consumption and water resources can be saved.

Description

High-concentration organic wastewater wet catalytic oxidation treatment device and use method thereof

Technical Field

The invention relates to the technical field of wastewater, in particular to a wet catalytic oxidation treatment device for high-concentration organic wastewater and a using method thereof.

Background

Generally, the reaction heat generated by 20000mg/L of wastewater treated by catalytic wet oxidation can maintain the self-reaction heat supply, while the reaction heat generated by the wastewater treated by COD > 35000mg/L is more, which is more than the self-requirement of the system. However, there is currently no mature method of heat removal. Therefore, the COD of the wastewater treated by the catalytic wet oxidation treatment is not more than 35000mg/L generally, and the wastewater with the concentration higher than that is diluted and treated.

Based on the above, the invention designs a high-concentration organic wastewater wet catalytic oxidation treatment device and a use method thereof, so as to solve the problems.

Disclosure of Invention

The invention aims to provide a high-concentration organic wastewater wet catalytic oxidation treatment device and a use method thereof, and aims to solve the problems that the waste water reaction proposed in the background art releases more heat, the system needs to be maintained, and surplus exists, and a mature heat taking method is not available for taking away the heat.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a high concentration organic waste water wet-type catalytic oxidation processing apparatus, it has the waste water buffer tank to connect gradually along waste water direction of delivery, the waste water filter, the waste water delivery pump, the reactor, flash tank and raw water pond, the delivery port of waste water delivery pump links to each other with the inside liquid distributor water inlet of reactor, be provided with air compressor, the air compressor export links to each other with the inside gas distributor air inlet of reactor, reactor top gaseous phase export links to each other with flash tank gaseous phase entry, the liquid phase export of reactor links to each other with flash tank liquid phase entry.

Preferably, a heat conduction oil system for heating the outer surface of the reactor is arranged, a heat conduction oil heating region is arranged on the outer surface of the reactor, an oil outlet of the heat conduction oil system is connected with an oil inlet at the bottom of the heat conduction oil heating region of the reactor, and an oil outlet at the top of the heat conduction oil heating region of the reactor is connected with an oil inlet of the heat conduction oil system.

Preferably, a compressed air buffer tank is arranged between the air compressor and the reactor, and a steam buffer tank is arranged between the flash tank and the reactor.

Preferably, an emergency pressure relief pipeline is connected between a gas phase pipeline between the reactor and the steam buffer tank and the raw water pool, and a safety valve is installed on the emergency pressure relief pipeline.

Preferably, a gas pressure reducing valve is installed on a gas phase pipeline between the flash tank and the steam buffer tank, and a liquid throttling valve and a sampling pipeline are installed on a liquid phase pipeline between the flash tank and the steam buffer tank.

Preferably, a tail water conveying pipeline is arranged, one end of the tail water conveying pipeline is connected with a tail water outlet at the bottom of the reactor and a tail water outlet at the bottom of the flash tank, the other end of the tail water conveying pipeline is connected with a wastewater cache tank, and a tail water conveying pump is installed on the tail water conveying pipeline.

Preferably, the inlet of the liquid distributor is positioned at the bottom of the reactor, the outlet of the liquid distributor faces upwards, the inlet of the gas distributor is positioned on the side wall of the reactor, and the outlet of the gas distributor faces downwards.

A wet catalytic oxidation treatment method for high-concentration organic wastewater is characterized in that the organic wastewater sequentially passes through a wastewater cache tank, a wastewater filter and a wastewater delivery pump and enters a reactor through a liquid distributor;

meanwhile, air is compressed by an air compressor and then enters a compressed air buffer tank, and then is decompressed and enters a reactor through a gas distributor, so that the organic wastewater and the air are fully mixed;

after being fully preheated by a heat-conducting oil system, carrying out catalytic wet oxidation reaction in a reactor;

the reaction self emits a large amount of reaction heat for preheating the subsequent wastewater, and an external heat conduction oil system is gradually closed for heating;

non-condensable gas and water vapor enter a steam buffer tank from a gas phase pipeline at the top of the reactor, and the gas is decompressed by a gas pressure reducing valve, enters a flash tank and is discharged into a raw water pool along with a pipeline;

the waste water after reaction enters a steam buffer tank from a liquid phase pipeline at the side part of the reactor, passes through a liquid throttle valve from the bottom of the steam buffer tank, enters a flash evaporation tank for flash evaporation vaporization, and is discharged into a raw water pool;

a small amount of waste water at the bottom of the flash tank is concentrated and then is conveyed to the waste water cache tank through a tail water conveying pipeline at a tail water conveying pump.

Preferably, the pressure of the reactor is 4-6 MPa, the temperature of the reactor is 250-300 ℃, and the opening range of the gas reducing valve is 5-30%.

Preferably, the volume flow ratio of the compressed air to the wastewater entering the reactor is 0.0035 COD to 0.0045 COD:1, and the COD in the formula is the initial COD of the wastewater.

Compared with the prior art, the invention has the beneficial effects that: the wastewater treatment device has the advantages that: (1) the treatment cost is low, the COD removal effect is good, and the occupied area is small; (2) the initial wastewater does not need to be diluted and can be directly used for treating high-concentration organic wastewater of over 35000 mg/L; (3) the effluent of the device does not need to be diluted or subjected to secondary biochemical treatment, and can be directly discharged after reaching the standard; (4) the heat conducting oil heating area is arranged on the surface of the reactor, and the heat exchanger and the reactor are combined together, so that the equipment investment can be reduced; (5) energy consumption and water resources can be saved;

the extra reaction heat is converted into latent heat of vaporization and then is taken away by pressure reduction flash evaporation through arranging equipment such as a steam buffer tank, a gas pressure reducing valve, a liquid throttle valve, a flash evaporation tank and the like; not only can the wastewater with COD less than or equal to 35000mg/L be treated, but also the high-concentration organic wastewater with COD more than 35000mg/L can be directly treated, thereby widening the application range of the catalytic wet oxidation technology and reducing unnecessary water resource consumption.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of the structure of the present invention.

1. An air compressor; 2. a compressed air buffer tank; 3. a heat transfer oil system; 4. a wastewater buffer tank; 5. a wastewater filter; 6. a wastewater delivery pump; 7. a reactor; 8. a steam buffer tank; 9. a flash tank; 10. a tail water delivery pump; 11. a safety valve; 12. a heat conducting oil heating area; 13. a gas distributor; 14. a liquid distributor; 15. a gas pressure reducing valve; 16. a liquid throttle valve; 17. a sampling pipeline; 18. an emergency pressure relief pipeline; 19. a tail water delivery line; 20. a gas phase line; 21. a liquid phase pipeline; 22. a raw water pool.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The utility model provides a high concentration organic waste water wet-type catalytic oxidation processing apparatus, it has wastewater buffer tank 4 to connect gradually along waste water direction of delivery, wastewater filter 5, waste water delivery pump 6, reactor 7, flash tank 9 and raw water pond 22, the delivery port of waste water delivery pump 6 links to each other with the 14 water inlets of the inside liquid distributor of reactor 7, be provided with air compressor 1, air compressor 1 export links to each other with the inside gas distributor 13 air inlet of reactor 7, 7 top gas phase exports of reactor link to each other with flash tank 9 gas phase entry, the liquid phase export of reactor 7 links to each other with flash tank 9 liquid phase entry.

Further, a heat conduction oil system 3 for heating the outer surface of the reactor 7 is arranged, a heat conduction oil heating region 12 is arranged on the outer surface of the reactor 7, an oil outlet of the heat conduction oil system 3 is connected with an oil inlet at the bottom of the heat conduction oil heating region 12 of the reactor 7, and an oil outlet at the top of the heat conduction oil heating region 12 of the reactor 7 is connected with an oil inlet of the heat conduction oil system 3.

Further, a compressed air buffer tank 2 is arranged between the air compressor 1 and the reactor 7, and a steam buffer tank 8 is arranged between the flash tank 9 and the reactor 7.

Further, an emergency pressure relief pipeline 18 is connected between a gas phase pipeline 20 between the reactor 7 and the steam buffer tank 8 and a raw water pool 22, and a safety valve 11 is installed on the emergency pressure relief pipeline 18 to prevent overpressure of the device.

Further, a gas pressure reducing valve 15 is installed on a gas phase line 20 between the flash tank 9 and the vapor buffer tank 8, and a liquid throttle valve 16 and a sampling line 17 are installed on a liquid phase line 21 between the flash tank 9 and the vapor buffer tank 8.

Furthermore, a tail water conveying pipeline 19 is arranged, one end of the tail water conveying pipeline 19 is connected with a tail water outlet at the bottom of the reactor 7 and a tail water outlet at the bottom of the flash tank 9, the other end of the tail water conveying pipeline 19 is connected with the wastewater cache tank 4, and a tail water conveying pump 10 is installed on the tail water conveying pipeline 19.

Further, the inlet of the liquid distributor 14 is positioned at the bottom of the reactor 7, the outlet of the liquid distributor 14 faces upwards, the inlet of the gas distributor 13 is positioned on the side wall of the reactor 7, and the outlet of the gas distributor 13 faces downwards.

A wet catalytic oxidation treatment method for high-concentration organic wastewater, wherein the organic wastewater sequentially passes through a wastewater buffer tank 4, a wastewater filter 5 and a wastewater delivery pump 6 and enters a reactor 7 through a liquid distributor 14;

meanwhile, air is compressed by an air compressor 1 and then enters a compressed air buffer tank 2, and then is decompressed and enters a reactor 7 through a gas distributor 13, so that the organic wastewater and the air are fully mixed;

after being fully preheated by the heat conducting oil system 3, the catalytic wet oxidation reaction is carried out in the reactor 7;

the reaction self emits a large amount of reaction heat for preheating the subsequent wastewater, and the external heat conduction oil system 3 is gradually closed for heating;

non-condensable gas and water vapor enter a steam buffer tank 8 from a gas phase pipeline 20 at the top of the reactor 7, the gas is decompressed by a gas pressure reducing valve 15, enters a flash tank 9 and is discharged into a raw water pool 22 along with a pipeline;

the reacted waste water enters a steam buffer tank 8 from a liquid phase pipeline 21 at the side part of the reactor 7, passes through a liquid throttle valve 16 from the bottom of the steam buffer tank 8, enters a flash evaporation tank 9 for flash evaporation, and is discharged into a raw water pool;

a small amount of wastewater at the bottom of the flash tank 9 is concentrated and then is conveyed to the wastewater buffer tank 4 through a tail water conveying pipeline 19 at a tail water conveying pump 10.

Further, the pressure of the reactor 7 is 4-6 MPa, the temperature of the reactor 7 is 250-300 ℃, and the opening range of the gas reducing valve 15 is 5-30%.

Furthermore, the volume flow ratio of the compressed air and the wastewater entering the reactor 7 is 0.0035 COD to 0.0045 COD:1, and the COD in the formula is the initial COD of the wastewater.

One embodiment of the invention:

in the device, a liquid phase pipeline 21 and a gas phase pipeline 20 are arranged between a reactor 7 and a steam buffer tank 8 to separate the gas phase and the liquid phase of the reactor 7, a gas pressure reducing valve 15 is arranged on the gas phase pipeline 20 between the steam buffer tank 8 and a flash tank 9 to stably adjust the reaction pressure of the reactor 7, and a liquid throttle valve 16 is arranged on the liquid phase pipeline 21 between the steam buffer tank 8 and the flash tank 9.

The liquid phase pipeline 21 of the liquid phase outlet at the bottom of the steam buffer tank 8 and the liquid phase inlet at the side of the flash tank is provided with a sampling pipeline, so that sampling detection is convenient.

The diameter of a pipeline connected with the top of the flash tank 9 and the raw water pool 22 is 100-300 mm, and if the diameter of the pipeline is small in size, gas in the flash tank is easy to gather and is not easy to discharge, so that potential safety hazards are caused; if the diameter of the pipe is selected to be large, the cost of the device is increased.

High-concentration organic wastewater (COD is more than or equal to 5000mg/L, particularly COD is more than or equal to 35000mg/L) sequentially enters a reactor 7 through a wastewater buffer tank 4, a wastewater filter 5, a wastewater delivery pump 6 and a liquid distributor 14, meanwhile, air is compressed by an air compressor 1 and then enters a compressed air buffer tank 2, and then is decompressed and enters the reactor 7 through a gas distributor 13, so that the wastewater and the compressed air are fully mixed, and after being fully preheated by a heat conduction oil system 3, catalytic wet oxidation reaction is carried out in the reactor 7.

During the reaction, a large amount of reaction heat is released by the reactor to preheat the subsequent wastewater, and the external heat conduction oil system 3 is gradually closed to heat.

Non-condensable gas and water vapor enter a steam buffer tank 8 from the top of the reactor 7, the gas is decompressed by a gas pressure reducing valve 15 and then enters a flash tank 9, and the gas is conveyed through a gas phase pipeline 20 in the process and is discharged into a raw water pool 22 along with the pipeline;

the reacted waste water enters a steam buffer tank 8 from the side part of the reactor 7, then enters a flash tank 9 from the bottom of the steam buffer tank 8 after passing through a liquid throttle valve 16 for flash vaporization, and is conveyed through a liquid phase pipeline 21 in the process and then discharged into a raw water pool 22.

A small amount of wastewater at the bottom of the flash tank 9 still has high COD after being concentrated and returns to the wastewater cache tank 4 through a tail water conveying pipeline 19 under the conveying of a tail water conveying pump 10;

a small amount of wastewater at the bottom of the reactor 7 is conveyed back to the wastewater buffer tank 4 by a tail water conveying pipeline 19 under the conveying of a tail water conveying pump 10.

The pressure of the reactor 7 is 4-6 MPa, the temperature of the reactor 7 is 250-300 ℃, the opening range of the gas reducing valve 15 is 5-30%, the feeding amount of the wastewater is 0.5-3 tons/hour, and the volume flow ratio of the compressed air entering the reactor 7 to the wastewater is 0.0035 COD-0.0045 COD: 1. (in this formula, COD is the initial COD of the wastewater, unit: mg/L).

The device utilizes the principle that high-temperature and high-pressure liquid can be vaporized by flash evaporation when entering a low-pressure environment, and treated water from the catalytic wet oxidation device can be directly discharged after entering a lower-level flash tank 9 through the liquid throttle valve 16 for flash evaporation and vaporization without dilution or biochemical treatment, thereby achieving the purpose of saving water resources and energy consumption.

The heat conducting oil heating area 12 is arranged on the reactor 7, so that the cost of the heat exchanger is saved, and the initial preheating of the waste water is realized, thereby achieving the purpose of saving equipment investment.

The device is characterized in that a liquid distributor 14 and a gas distributor 13 are specially arranged, wherein an inlet of the liquid distributor 14 is positioned at the bottom of the reactor 7, an outlet of the liquid distributor 14 faces upwards, an inlet of the gas distributor 13 is positioned at the side part of the reactor 7, and an outlet of the gas distributor 14 faces downwards. The outlet of the gas distributor 13 and the outlet of the liquid distributor 14 are oppositely arranged, so that the mixing of oxygen and wastewater in the reactor 7 is accelerated, and the preheating speed of the wastewater which just enters the reactor is accelerated, thereby improving the catalytic oxidation effect of the wastewater.

The device is provided with a safety valve 11 and an emergency pressure relief pipeline 18, and the outlet of the emergency pressure relief pipeline 18 is connected with a raw water pool 22 to prevent the device from overpressure.

TABLE 1 treatment effect of wet catalytic oxidation on high concentration organic wastewater

Kind of waste water	Initial COD	COD of effluent	Removal rate
				DMSO+MEA	18612.9	124.1	99.3％
NMF+MDG	77089.3	331.8	99.6％

The electrical equipment is connected with an external power supply through an external control switch.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. The utility model provides a high concentration organic waste water wet-type catalytic oxidation processing apparatus which characterized in that: connect gradually along waste water direction of delivery and be provided with waste water buffer tank (4), waste water filter (5), waste water delivery pump (6), reactor (7), flash tank (9) and raw water pond (22), the delivery port of waste water delivery pump (6) links to each other with reactor (7) inside liquid distributor (14) water inlet, be provided with air compressor (1), air compressor (1) export links to each other with reactor (7) inside gas distributor (13) air inlet, reactor (7) top gas phase export links to each other with flash tank (9) gas phase entry, the liquid phase export of reactor (7) links to each other with flash tank (9) liquid phase entry.

2. The wet catalytic oxidation treatment apparatus for high concentration organic wastewater according to claim 1, wherein: the reactor is provided with a heat conduction oil system (3) for heating the outer surface of the reactor (7), a heat conduction oil heating region (12) is arranged on the outer surface of the reactor (7), an oil outlet of the heat conduction oil system (3) is connected with an oil inlet at the bottom of the heat conduction oil heating region (12) of the reactor (7), and an oil outlet at the top of the heat conduction oil heating region (12) of the reactor (7) is connected with an oil inlet of the heat conduction oil system (3).

3. The wet catalytic oxidation treatment apparatus for high concentration organic wastewater according to claim 1, wherein: a compressed air buffer tank (2) is arranged between the air compressor (1) and the reactor (7), and a steam buffer tank (8) is arranged between the flash tank (9) and the reactor (7).

4. The apparatus according to claim 3, wherein the apparatus comprises: an emergency pressure relief pipeline (18) is connected between a gas phase pipeline (20) between the reactor (7) and the steam buffer tank (8) and the raw water pool (22), and a safety valve (11) is installed on the emergency pressure relief pipeline (18).

5. The apparatus according to claim 3, wherein the apparatus comprises: install gas relief pressure valve (15) on gas phase pipeline (20) between flash tank (9) and steam buffer tank (8), install liquid throttle valve (16) and sample pipeline (17) on liquid phase pipeline (21) between flash tank (9) and steam buffer tank (8).

6. The wet catalytic oxidation treatment apparatus for high concentration organic wastewater according to claim 1, wherein: be equipped with tail water conveying pipeline (19), tail water conveying pipeline (19) one end and reactor (7) bottom tail water export, flash tank (9) bottom tail water exit linkage, the tail water conveying pipeline (19) other end is connected with waste water buffer tank (4), install tail water delivery pump (10) on tail water conveying pipeline (19).

7. The wet catalytic oxidation treatment apparatus for high concentration organic wastewater according to claim 1, wherein: the inlet of the liquid distributor (14) is positioned at the bottom of the reactor (7), the outlet of the liquid distributor (14) faces upwards, the inlet of the gas distributor (13) is positioned on the side wall of the reactor (7), and the outlet of the gas distributor (13) faces downwards.

8. A wet catalytic oxidation treatment method for high-concentration organic wastewater by using any one of claims 1 to 7, which is characterized in that: organic wastewater sequentially passes through a wastewater buffer tank (4), a wastewater filter (5) and a wastewater delivery pump (6) and enters a reactor (7) through a liquid distributor (14);

meanwhile, air is compressed by an air compressor (1) and then enters a compressed air buffer tank (2), and then is decompressed and enters a reactor (7) through a gas distributor (13), so that the organic wastewater and the air are fully mixed;

after being fully preheated by the heat-conducting oil system (3), carrying out catalytic wet oxidation reaction in the reactor (7);

the reaction self emits a large amount of reaction heat for preheating the subsequent wastewater, and an external heat conduction oil system (3) is gradually closed for heating;

non-condensable gas and water vapor enter a steam buffer tank (8) from a gas phase pipeline (20) at the top of the reactor (7), and the gas is decompressed by a gas decompression valve (15), enters a flash tank (9) and is discharged into a raw water pool (22) along with a pipeline;

the reacted waste water enters a steam buffer tank (8) from a liquid phase pipeline (21) at the side part of the reactor (7), then enters a flash evaporation tank (9) from the bottom of the steam buffer tank (8) through a liquid throttle valve (16) for flash evaporation, and then is discharged into a raw water pool;

a small amount of wastewater at the bottom of the flash tank (9) is concentrated and then is conveyed to the wastewater buffer tank (4) through a tail water conveying pipeline (19) at a tail water conveying pump (10).

9. The wet catalytic oxidation treatment method for high concentration organic wastewater according to claim 8, wherein: the pressure of the reactor (7) is 4-6 MPa, the temperature of the reactor (7) is 250-300 ℃, and the opening range of the gas reducing valve (15) is 5-30%.

10. The wet catalytic oxidation treatment method for high concentration organic wastewater according to claim 8, wherein: the volume flow ratio of the compressed air and the wastewater entering the reactor (7) is 0.0035 COD to 0.0045 COD:1, and the COD in the formula is the initial COD of the wastewater.