CN204897513U - Heterogeneous catalytic oxidation moving bed reactor of ozone - Google Patents

Abstract

The utility model discloses a moving bed reactor for ozone heterogeneous catalytic oxidation. The reactor includes a water inlet system, an ozone generating system, a catalytic oxidation reaction system, a gas recovery system, a catalyst cleaning system and a water outlet system; the catalytic oxidation reaction system includes a reactor and a catalyst; the catalyst cleaning system contains Air stripper, material lifting pipe, material dropping port, washing waste water discharge pipe and catalyst cleaning chamber; the water inlet system is composed of a water inlet pipe and a water distributor; the water outlet system is composed of a water outlet tank and an outlet pipe; the gas The recovery system consists of a three-phase separator, a gas collection chamber, a gas collection pipe and a gas destroyer. Compared with the prior art, the reactor designed by the utility model has the advantages of small floor area, low investment, low operation cost, good treatment effect, convenient operation and management, can greatly improve the biodegradability of refractory wastewater, and provide a high level of support for subsequent biochemical treatment. good water quality conditions.

Description

A moving bed reactor for heterogeneous catalytic oxidation of ozone

technical field

The utility model belongs to the technical field of wastewater treatment, and in particular relates to a moving bed reactor for ozone heterogeneous catalytic oxidation.

Background technique

With the rapid growth of my country's economy and the rapid development of industry, the amount of wastewater brought by industrial production is increasing year by year. At the same time, people's awareness of environmental protection has gradually increased, and the discharge indicators of various pollutants have become increasingly stringent. There are a large amount of refractory organic matter and toxic and harmful substances in industrial wastewater, and it is difficult to make them reach the standard stably by ordinary biochemical methods. At present, the advanced catalytic oxidation method is widely used in the treatment of toxic, harmful and refractory wastewater. Among them, the ozone catalytic oxidation technology has the advantages of simple application, no secondary pollution, and good treatment effect.

Using ozone alone to oxidize refractory organic matter requires a large amount of ozone dosage and high operating costs, so it is not applicable in engineering. Combining ozone with a catalyst to carry out ozone catalytic oxidation can improve the ozone oxidation ability while reducing the dosage of ozone. Therefore, ozone catalytic oxidation technology has become a research direction. Catalysts are divided into homogeneous catalysts and heterogeneous catalysts. Because homogeneous catalysts are easy to lose and cause secondary pollution, they are rarely used. Heterogeneous catalysts have high catalytic ozone decomposition efficiency, thorough oxidation of pollutants, and good stability. , not easy to lose, no need for subsequent treatment, catalyst can be regenerated and reused, etc., so heterogeneous catalysts will become the future development direction.

The heterogeneous catalyst is mainly a metal oxide or a metal or metal oxide supported on a carrier. During operation, the catalyst will be polluted. The usual solution is to stop the operation of the reactor for gas washing, water washing and combined backwashing. . High power consumption, large amount of backwash wastewater, and complicated operation. If the concentration of influent suspended solids is high, the frequency of backwashing is high. Since the ozone reactor needs to be sealed to prevent ozone leakage, air washing, water washing and backwashing bring more operational difficulties and even difficult operation. Moreover, there are few studies on this special ozone catalytic oxidation equipment at present.

Utility model content

In order to solve the above technical problems, the utility model provides a simple and efficient ozone heterogeneous catalytic oxidation moving bed reactor.

A moving bed reactor for ozone heterogeneous catalytic oxidation described in the utility model comprises a water inlet system, an ozone generating system 2, a catalytic oxidation reaction system, a gas recovery system, a catalyst cleaning system and a water outlet system; the catalytic oxidation reaction The system includes a reactor 31 and a catalyst 32 placed in the reactor 31; the catalyst cleaning system contains a gas stripper 51, a material lifting pipe 52, a discharge port 53, a washing waste water discharge pipe 54 and a catalyst cleaning chamber 55 The catalyst cleaning chamber 55 is formed by a central recess at the top of the reactor 31, and its bottom central opening forms a blanking port 53, and the bottom left side is provided with a washing waste water discharge pipe 54 passing through the reactor 31; The feed pipe 52 extends into the reactor 31 from the discharge port 53, and its lower end has a water distributor 12, a baffle plate 13 and an air stripper 51 sequentially from top to bottom; the water inlet system is composed of a water inlet pipe 11 and a water distributor 12 ; The water distributor 12 is in the reactor 31, its top is connected to the end of the water inlet pipe 11, and the bottom is provided with a horn-shaped port; the ozone generating system 2 is located outside the reactor 31, and it is connected with the water inlet pipe 11; The water outlet system consists of a water outlet tank 61 and an outlet pipe 62; the water outlet tank 61 is located at the top of the reactor 32; the water outlet pipe 62 is connected to the lower part of the water outlet tank 61; the gas recovery system 4 is composed of a three-phase separator 41, a gas collecting Chamber 42, gas collection pipe 43 and gas destroyer 44; the gas collection chamber 42 is located below the water outlet tank 61, and the inner side of its lower part is provided with an opening for the three-phase separator 41 to protrude; the gas collection pipe 43 is connected to the collection The lower part of the gas chamber 42 extends out of the reactor 31 and is connected with the gas destroyer 44 .

The catalyst 32 uses Al ₂ O ₃ as a carrier, supports nickel oxide, iron oxide or cobalt oxide, and has a particle size of 2-6 mm.

The pipeline of the ozone generating system 2 is provided with a flow meter to control the ozone concentration.

The ozone concentration in the catalytic oxidation reaction system is 20-100mg/L.

During the operation of the reactor, the hydraulic retention time of the refractory wastewater is 0.5-1.5h, and the effective water depth is above 5m.

The catalyst 32 will be polluted after running for a certain period of time, and then cleaned and regenerated by the catalyst cleaning system. The polluted catalyst 32 is lifted to the catalyst cleaning chamber 55 through the stripper 51 and the feeding pipe 52, and finally the catalyst 32 is passed through the blanking The opening 53 falls back into the catalytic oxidation reaction system for recycling. The opening 53 contains a folded plate, which further vibrates and cleans the catalyst 32 , and the washing waste water is discharged through the discharge pipe 54 .

Compared with the prior art, the ozone heterogeneous catalytic oxidation moving bed reactor designed by the utility model overcomes the shortcoming of intermittent water stop for backwashing, reduces the resistance caused by catalyst pollution and increases the utilization of the catalyst Efficiency, while reducing the requirements for influent water quality, the purified gas is mainly oxygen, which can be discharged directly or supply oxygen to other devices that require it. In addition, the reactor designed by the utility model has small footprint, low investment, low operating cost, good treatment effect, convenient operation and management, can greatly improve the biodegradability of refractory wastewater, and provide good water quality conditions for subsequent biochemical treatment , At the same time, it can also remove 40% of organic matter.

Description of drawings

Fig. 1 is the structure diagram of the ozone heterogeneous catalytic oxidation moving bed reactor designed by the utility model.

Detailed ways

The ozone heterogeneous catalytic oxidation moving bed reactor described in the utility model will be further described below in conjunction with specific examples, but the protection scope of the utility model is not limited thereto.

Example 1

The ozone heterogeneous catalytic oxidation moving bed reactor designed by the utility model comprises a water inlet system, an ozone generating system 2, a catalytic oxidation reaction system, a gas recovery system, a catalyst cleaning system and a water outlet system; the catalytic oxidation reaction system includes Reactor 31 and the catalyst 32 placed in the reactor 31; the catalyst cleaning system contains a gas stripper 51, a material lifting pipe 52, a material discharge port 53, a washing waste water discharge pipe 54 and a catalyst cleaning chamber 55; Catalyst cleaning chamber 55 is formed by the central recess at the top of reactor 31, and its bottom central opening forms a blanking port 53, and a washing waste water discharge pipe 54 passing through reactor 31 is provided below the bottom left side; Stretch into the reactor 31 from the blanking port 53, and its lower end has a water distributor 12, a baffle plate 13 and an air stripper 51 successively from top to bottom; the water inlet system is made up of a water inlet pipe 11 and a water distributor 12; The water distributor 12 is in the reactor 31, and its top is connected to the end of the water inlet pipe 11, and a trumpet-shaped port is established at the bottom; the ozone generating system 2 is arranged outside the reactor 31, and it is connected with the water inlet pipe 11; the water outlet system is composed of The water outlet tank 61 and the water outlet pipe 62 are composed; the water outlet tank 61 is located at the top of the reactor 32; the water outlet pipe 62 is connected to the lower part of the water outlet tank 61; the gas recovery system consists of a three-phase separator 41, a gas collection chamber 42, a gas The collection pipe 43 and the gas breaker 44 are composed; the gas collection chamber 42 is located below the water outlet tank 61, and the inner side of the lower part is provided with an opening for the three-phase separator 41 to protrude; the gas collection pipe 43 is connected to the lower part of the gas collection chamber 42 And extend out of the reactor 31 and connect with the gas breaker 44 . The catalyst 32 uses Al ₂ O ₃ as a carrier, supports cobalt oxide, and has a particle size of 3-4mm. The pipeline of described ozone generation system 2 is provided with flowmeter to control ozone concentration; In described catalytic oxidation reaction system, ozone concentration is 50mg/L; The hydraulic retention time of described reactor refractory waste water during operation is 0.5-1.0h, the effective water depth is 5.5m.

The method for treating refractory wastewater by the above-mentioned ozone heterogeneous catalytic oxidation moving bed reactor: 1) The refractory wastewater is pumped into the ozone heterogeneous catalytic oxidation moving bed reactor through the water inlet pipe 11, and the ozone generation system 2 is connected with the water inlet pipe 11. Connect, mix the generated ozone with refractory wastewater in the water inlet pipe 11, distribute water and gas evenly through the water distributor 12, improve the uniform mixing degree of ozone, increase the utilization rate of ozone, and move bed reaction of ozone heterogeneous catalytic oxidation The concentration of ozone in the device is 50 mg/L; 2) Ozone is in contact with catalyst 32 in the catalytic oxidation reaction system, and ozone is catalyzed into OH with strong oxidation ability and non-selectivity, and the organic matter in the refractory wastewater is oxidized and decomposed, especially The refractory organic matter is decomposed into small molecules and easy to degrade organic matter, which can greatly improve the biodegradability of refractory wastewater, and at the same time, it will completely decompose some organic matter into CO ₂ and H ₂ O to achieve the effect of removing organic matter; 3) After ozone The refractory wastewater after catalytic oxidation flows through the _{three -} phase separator and overflows into the water outlet tank 61 at the top, and flows out through the water outlet pipe 62 _; Separated, collected in the gas collection chamber 42, transported to the gas destroyer 44 through the gas discharge pipe, the residual ozone is decomposed into oxygen here, reducing the secondary pollution to the environment; 4) The catalyst 32 runs for a certain period of time Afterwards, it will be polluted, and pollutants adhere to the surface, which blocks the contact between the catalyst and ozone and reduces the catalytic ability. Through the catalyst cleaning system, the polluted catalyst 32 is lifted to the catalyst cleaning chamber 55 through the stripper 51 and the feeding pipe 52. During the process, the catalyst 32 mixes and collides in the feeding pipe 52 to benefit the cleaning of the catalyst 32. The catalyst 32 falls back to the catalytic oxidation reaction system through the discharge port 53 for recycling. The discharge port 53 contains a flap to further vibrate and clean the catalyst 32 , Washing wastewater is discharged through discharge pipe 54.

Compared with the prior art, the ozone heterogeneous catalytic oxidation moving bed reactor described in the utility model overcomes the shortcoming of intermittent water stop for backwashing, reduces the resistance caused by catalyst pollution and increases the utilization of the catalyst Efficiency, while reducing the requirements for influent water quality, the purified gas is mainly oxygen, which can be discharged directly or supply oxygen to other devices that require it. In addition, the reactor designed by the utility model has small footprint, low investment, low operating cost, good treatment effect, convenient operation and management, can greatly improve the biodegradability of refractory wastewater, and provide good water quality conditions for subsequent biochemical treatment , At the same time, it can also remove 40% of organic matter.

Claims (5)

1. A moving bed reactor for heterogeneous catalytic oxidation of ozone, characterized in that the reactor comprises water inlet system, ozone generation system (2), catalytic oxidation reaction system, gas recovery system, catalyst cleaning system and water outlet system ; The catalytic oxidation reaction system includes a reactor (31) and the catalyst (32) placed in the reactor (31); the catalyst cleaning system includes a gas stripper (51), a feed pipe (52), a drop Feed port (53), washing waste water discharge pipe (54) and catalyst cleaning chamber (55); the catalyst cleaning chamber (55) is formed by a central recess at the top of the reactor (31), and its bottom central opening forms a discharge port (53), the bottom of its left side is provided with the washing waste water discharge pipe (54) passing through the reactor (31); the material lifting pipe (52) stretches into the reactor (31) from the blanking port (53) Inside, there are water distributors (12), baffles (13) and air strippers (51) at its lower end in sequence from top to bottom; the water inlet system is composed of water inlet pipes (11) and water distributors (12); The water distributor (12) is in the reactor (31), its upper part is connected to the end of the water inlet pipe (11), and the lower part is provided with a horn-shaped port; the ozone generating system (2) is located outside the reactor (31), and it is connected to the inlet The water pipes (11) are connected; the water outlet system is composed of a water outlet tank (61) and an outlet pipe (62); the water outlet tank (61) is located at the top of the reactor (31); the outlet pipe (62) is connected to the The lower part of the water tank (61); the gas recovery system is composed of a three-phase separator (41), a gas collection chamber (42), a gas collection pipe (43) and a gas destroyer (44); the gas collection chamber (42) Located below the water outlet tank (61), the inner side of the lower part is provided with an opening for the three-phase separator (41) to protrude; the gas collection pipe (43) is connected to the lower part of the gas collection chamber (42) and extends out of the reactor (31) The outside is connected with the gas destroyer (44). 2. a kind of ozone heterogeneous catalytic oxidation moving bed reactor according to claim 1, is characterized in that, described catalyst (32) is with Al ₂ O ₃ as carrier, loaded nickel oxide, iron oxide or cobalt Oxide, the particle size is 2-6mm. 3. a kind of ozone heterogeneous catalytic oxidation moving bed reactor according to claim 1, is characterized in that, the pipeline of described ozone generating system (2) is provided with flow meter to control ozone concentration. 4. A moving bed reactor for ozone heterogeneous catalytic oxidation according to claim 1, characterized in that the ozone concentration in the catalytic oxidation reaction system is 20-100 mg/L. 5. a kind of ozone heterogeneous catalytic oxidation moving bed reactor according to claim 1, is characterized in that, the hydraulic retention time of described reactor is 0.5-1.5h in operation process refractory waste water, and effective water depth is in More than 5m.