CN204469543U - A kind of active carbon buffering photo catalysis reactor - Google Patents

Abstract

The utility model relates to an activated carbon buffer photocatalytic reactor, which belongs to the field of environmental protection equipment. The reactor includes a reactor shell, the two ends of the shell are retractable openings, one side is a gas inlet, and the other side is a gas outlet, the reactor is set as a side-by-side door structure, and a glass window is installed outside the shell; The interior includes air distribution plate, pretreatment activated carbon filter, ultraviolet lamp, honeycomb activated carbon supported catalyst, terminal activated carbon filter, etc. The reactor is mainly aimed at the treatment of organic waste gas, and to deal with the unstable concentration of pollutants in the waste gas treatment project. An activated carbon adsorption buffer section is set in front of the catalytic reaction area, and the unstable exhaust gas is sorted into a balanced and stable air flow before entering the catalytic reaction area; honeycomb type The activated carbon-supported catalyst can provide active vacancies for the photocatalytic reaction, prolong the residence time of organic matter in the exhaust gas, and improve the purification efficiency; the terminal activated carbon filter can prolong the degradation time of active particles on organic matter, effectively utilize active particles, and further deepen the reaction to improve purification efficiency .

Description

A kind of activated carbon buffer photocatalytic reactor

technical field

The invention relates to an activated carbon buffer photocatalytic reactor, which has the advantages of simple structure, convenient operation, strong adaptability, high photocatalytic efficiency, and long-term stable operation, and is especially suitable for industrial enterprises with large air volume and large concentration fluctuations. Waste gas treatment.

Background technique

Photocatalytic technology originated from a paper published by Fujishima and Honda in Nature in 1972. The research results showed that TiO2 single crystal electrodes have the function of photo-splitting water. Since then, semiconductor photocatalytic reactions have attracted widespread attention.

In recent decades, more and more researchers have devoted themselves to the research of TiO ₂ photocatalytic oxidation to remove volatile organic compounds (VOCs) in exhaust gas, and it has been gradually transformed from laboratory research to practical application. The main technical problem to be solved for the large-scale application of the photocatalytic oxidation method is the immobilization of the _TiO2 catalyst and the design of the corresponding reactor with simple structure, convenient operation, strong adaptability, high photocatalytic efficiency, and long-term stable operation. .

According to the form of catalyst in the reactor, the gas-solid phase photocatalytic reactor can be divided into two categories: fixed bed reactor and fluidized bed reactor. The fluidized bed catalyst in the fluidized bed reactor is in a state of continuous flow, migration, and tumbling, and the reaction gas flows between the carrier particles, which can make full use of the surface of the catalyst and greatly increase the effective specific surface area of the catalyst. However, the fluidized bed reactor also There are problems that the catalyst is easy to lose, difficult to separate, and difficult to reuse. The gas after the reaction will contain catalyst dust, causing secondary pollution and cannot be used as terminal treatment equipment. The fixed bed reactor fixes the catalyst on the carrier, which can largely avoid the problem of catalyst loss, but at the same time, there are also problems such as small effective specific surface area of the catalyst, small effective contact area between the catalyst and the reactants, low catalytic efficiency, and inconvenient replacement of the catalyst, etc. question.

In view of the above-mentioned problems, CN202398286U discloses a fixed photocatalytic oxidation waste gas treatment reactor. A central rotating shaft is arranged in the axial center of the reactor cylinder, and several horizontally placed disks are arranged on the central rotating shaft. The disks have In the small gap, a waterproof base is installed on the upper surface of the disc, an ultraviolet light source is installed on the base, a fiber net coated with a catalyst base film is installed on the lower surface and/or the upper surface, and a photocatalyst base film is coated on the cylinder wall. CN103212291A discloses a V-type folded plate photocatalytic reactor, in which photocatalyst is evenly coated on the upper and lower surfaces of all folded plates, and the folded plates divide the reaction outer box into several gas channels, and the adjacent two gas channels communicate with each other. , every two adjacent gas channels are arranged with ultraviolet lamp tubes, and the gas flows through each gas channel in turn to react. The above-mentioned reactor can increase the contact area between the catalyst and the reactant to a certain extent, thereby improving the catalytic efficiency.

However, the composition of pollutants in the exhaust gas in actual projects is complex and the concentration fluctuates greatly with factors such as working conditions, seasons, and climates, making the photocatalytic reaction efficiency unable to be guaranteed. At present, there is no clear report to solve the problem of the change of exhaust gas volume and the organic matter in exhaust gas. The effect of concentration fluctuations on the efficiency of catalytic reactions.

Based on the above reasons, it is particularly necessary to design and invent a new type of photocatalytic reactor that can maintain high catalytic reaction efficiency in actual projects where the amount of exhaust gas and the concentration of organic matter fluctuate continuously.

Contents of the invention

Aiming at the deficiencies of the prior art, the object of the present invention is to provide an activated carbon buffered photocatalytic reactor with simple structure, convenient operation, strong adaptability, high photocatalytic efficiency, and long-term stable operation. In order to solve the problem of fluctuations in the concentration of exhaust gas, the unstable exhaust gas will be sorted into a balanced and stable airflow through reasonable air distribution and pre-treatment activated carbon filters, thereby improving the efficiency of photocatalytic reactions; honeycomb activated carbon-loaded catalysts provide active vacancies for photocatalytic reactions, and at the same time prolong the time spent in the exhaust gas. The residence time of organic matter improves the efficiency of catalytic reaction; the terminal activated carbon filter prolongs the degradation time of active particles on organic matter, which can effectively use active particles and further improve the purification efficiency.

The specific technical solution adopted in the present invention is: an activated carbon buffer photocatalytic reactor, including a reactor shell, the two ends of the shell are retractable openings, one side is a gas inlet, and the other side is a gas outlet; The external surface is provided with side-by-side doors and glass windows;

It is convenient for the installation and replacement of internal components. The reactor is equipped with side-by-side doors. At the same time, there is a window on the door to directly observe the reaction status in the reactor.

The middle of the housing is set as a catalytic reaction chamber, and the two ends of the catalytic reaction chamber are respectively connected to the gas inlet and the gas outlet; an air distribution plate is arranged between the catalytic reaction chamber and the gas inlet;

The air distribution plate is 2 to 8 steel plates with an angle of 15° to 75° to the horizontal direction, which divides the airflow into different channels, avoids the dead angle of airflow, and ensures the uniform distribution of airflow.

The catalytic reaction chamber is provided with 1 to 5 layers of partitions in the middle, and the catalytic reaction chamber is divided into 2 to 6 reaction chambers by the partitions to reduce the processing capacity of each reaction chamber; The cloth is the same, and a pretreatment activated carbon filter, a catalytic reaction zone and a terminal activated carbon filter are arranged in sequence between the partition and the shell perpendicular to the direction of the air inlet;

The pretreatment activated carbon filter can be an activated carbon plate or bag filter; the filter material is refined by advanced technology, and has a large specific surface area, developed voids, high strength, and high-quality activated carbon and chemical adsorption materials with strong adsorption performance. The size and number depend on the size of the reactor, and its main purpose is to organize the exhaust gas with unstable concentration into a balanced and stable air flow through the dynamic adsorption and desorption balance of activated carbon, so as to improve the reaction efficiency.

The catalytic reaction area includes ultraviolet lamps and catalyst plates, and the two are arranged alternately at intervals, forming 2 to 10 layers of reaction channels in each reaction chamber, reacting step by step, and continuously improving the reaction efficiency;

The catalyst plate uses honeycomb-type activated carbon to support the catalyst, and the catalyst supporting material is aluminum honeycomb. The surface of the aluminum honeycomb is coated with 2 to 5 layers of activated carbon, and the catalyst is sprayed on the surface of the activated carbon, and the catalyst loading is 1% to 40% of the mass of the activated carbon. .

The distance between the ultraviolet lamp adjacent to the catalytic reaction zone and the catalyst plate is determined through experimental optimization, preferably 10 mm to 1 m. The distance between the ultraviolet lamp and the photocatalyst is determined to ensure that the light power on the catalyst plate is the largest, and the light wave and the macropores and mesopores of the catalyst are formed. The heat and energy generated by the wave vibration make the organic molecules fully oxidize and degrade on the surface of the catalyst, and the small molecules after the reaction are desorbed smoothly, achieving the functions of organic degradation and in-situ regeneration of the catalyst.

The catalytic reaction chamber is divided into 2 to 6 reaction chambers by partitions, which can reduce the processing air volume of the unit reaction chambers, improve the utilization rate of catalytic active sites, and improve the catalytic reaction efficiency.

The catalytic reaction zone is an ultraviolet lamp and a catalyst plate, and the two are arranged alternately, the distance between the adjacent ultraviolet lamp and the catalyst is 10 mm to 1 m, and 2 to 10 layers of reaction channels are formed in each reaction chamber, and the reaction gas gradually The stages pass through the reaction channel to continuously improve the reaction efficiency.

The terminal activated carbon filter is loaded with a catalyst, and the loading amount of the catalyst is 1%-20% of the mass of the activated carbon, and the catalyst is _TiO2 and CdS, and the amount of CdS is 0.1%-20% of the mass of the _TiO2 .

, effectively prolong the degradation time of active particles on organic matter, can effectively use active particles, and further improve the purification efficiency. Provide catalytic active sites for the residual organic molecules and the active particles produced in the photocatalytic reaction area, and the two fully react to ensure the reaction efficiency of organic molecules, while reducing the escape of active particles and avoiding secondary pollution.

The installation design of the guide rail makes the ultraviolet lamp and catalyst plate can be quickly installed and disassembled. The guide rail is made according to the size of the filter holder, ultraviolet lamp holder and catalyst frame to ensure that the internal components can be easily and quickly pushed into the catalytic reaction chamber along the guide rail, and convenient Disassembly, maintenance, replacement, etc.;

The catalytic reactor can realize a modular structure according to the different exhaust gas volumes. A certain amount of pretreatment activated carbon filters, ultraviolet lamps, catalysts and terminal activated carbon filters are used as a module, which can handle 5000-20000m ³ /h air volume. By adjusting the number of modules It can handle different gas volumes of waste gas, and at the same time, the module and the reactor shell can be assembled in a rail-type way, which is convenient and fast, and is suitable for large-scale industrial applications.

The catalytic reactor of this application is mainly used in the catalytic oxidation of low-concentration VOCs and odorous gases such as H ₂ S, NH ₃ , methyl mercaptan, and methyl sulfide in the exhaust gas of chemical companies, pharmaceutical companies, sewage treatment plants, and waste incineration plants. , Deep purification.

In addition, the present invention can be used alone as the core treatment equipment for medium and low concentration waste gas, can also be used in series or parallel according to the gas volume, and can also be used as a deep purification device in combination with other equipment such as washing towers and plasma equipment.

When in use, the gas to be treated enters the interior of the shell through the gas inlet, and the air distribution through the air distribution plate makes the air flow enter the catalytic reaction chamber evenly and gently. After being balanced and rectified by the pretreatment activated carbon filter, it is irradiated by ultraviolet light and loaded with catalyst. Catalytic reaction occurs on the catalyst plate, and then further reacts and absorbs through the terminal activated carbon filter to achieve the purpose of deep purification. After the treatment, the purified gas is discharged to the chimney through the gas outlet.

Beneficial effects of the present invention

1. The present invention provides an activated carbon buffer photocatalytic reactor with simple structure, convenient operation, strong adaptability, high photocatalytic efficiency, and long-term stable operation.

2. The present invention can solve the problem of unstable exhaust gas concentration in actual engineering. Through the dynamic adsorption and desorption balance of activated carbon, the exhaust gas with unstable concentration can be sorted into a balanced and stable air flow to improve the reaction efficiency.

3. In the present invention, the ultraviolet lamp and the catalyst are arranged at intervals and react step by step. The catalyst adopts a honeycomb activated carbon-supported catalyst to strengthen the photocatalytic reaction, and optimize the distance between the catalyst and the lamp tube to improve the efficiency of the catalytic reaction.

4. The terminal activated carbon filter set in the present invention can effectively prolong the degradation time of organic matter by active particles, can effectively utilize active particles, and further improve purification efficiency.

5. All internal components of the present invention, including activated carbon filters, ultraviolet lamps, catalysts, etc., are assembled by brackets and installed in the reactor by guide rails, which are convenient for installation, maintenance and replacement, quick loading and unloading, and are suitable for large-scale industrial promotion.

6. The present invention can adopt a modular rail-type assembly method to cope with different gas volumes. The reactor only needs to adjust the number of modules, which is convenient and quick, and is suitable for large-scale industrial applications.

7. The present invention can be widely used in the production of low-concentration VOCs and odorous gases such as H ₂ S, NH ₃ , methyl mercaptan, and methyl sulfide in chemical companies, pharmaceutical companies, sewage treatment plants, and waste incineration plants. Catalytic oxidation, deep purification.

In summary, the activated carbon buffer photocatalytic reactor provided by the present invention has the advantages of simple structure, convenient operation, easy installation, high catalytic efficiency, suitable for large-scale production, etc., and has a relatively broad market prospect.

Description of drawings

Fig. 1 External schematic diagram of activated carbon buffer photocatalytic reactor;

Figure 2 The internal schematic diagram of the activated carbon buffer photocatalytic reactor;

In the figure, 1 is the gas inlet, 2 is the catalytic reaction chamber, 3 is the air distribution plate, 4 is the partition, 5 is the pretreatment activated carbon filter, 6 is the ultraviolet lamp, 7 is the catalyst plate, 8 is the shell, 9 is the Gas outlet, 10 is a reactor door, 11 is a glass window, and 12 is a terminal activated carbon filter.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

Example 1

Figure 1 and Figure 2 are the external schematic diagram and internal schematic diagram of the activated carbon buffer photocatalytic reactor;

An activated carbon buffered photocatalytic reactor, comprising a reactor housing 8, the two ends of the housing 8 are contracted openings, one side is a gas inlet 1, and the other side is a gas outlet 9; the outer surface of the housing 8 is provided with Side by side door 10 and glass window 11;

It is convenient for the installation and replacement of internal components. There is a window on the door to directly observe the reaction status in the reactor.

The middle of the housing 8 is set as a catalytic reaction chamber 2, and the two ends of the catalytic reaction chamber 2 are respectively connected to the gas inlet 1 and the gas outlet 9; an air distribution plate 3 is arranged between the catalytic reaction chamber 2 and the gas inlet 1;

The catalytic reaction chamber 2 is provided with a partition 4 in the middle, and the catalytic reaction chamber 2 is divided into upper and lower chambers by the partition 4, and the arrangement of the upper and lower chambers is the same; between the partition 4 and the housing 8 A pretreatment activated carbon filter 5, a catalytic reaction zone and a pretreatment activated carbon filter 5 are sequentially arranged between them;

The activated carbon filter can be selected as an activated carbon plate or bag filter; the filter material is refined with advanced technology, and has a large specific surface area, developed voids, high strength, and high-quality activated carbon and chemical adsorption materials with strong adsorption performance. The number depends on the size of the reactor.

The catalytic reaction zone is composed of ultraviolet lamps 6 and catalyst plates 7, which are arranged alternately. The distance between adjacent ultraviolet lamps and catalysts is 10mm-1m, and 2-10 layers of reaction channels are formed in each reaction chamber.

Make guide rails according to the size of filter holder, ultraviolet lamp holder and catalyst frame to ensure that the internal components can be pushed into the guide rail smoothly, and the filter, ultraviolet lamp and catalyst frame can be pushed into the catalytic reaction chamber along the guide rail;

The installation design of the guide rail makes the UV lamp and the catalyst plate detachable, and the catalytic reactor can realize a modular structure according to the different exhaust gas volumes. A certain amount of UV lamps and catalysts are used as a module, which can handle 5000-20000m ³ /h air volume, by adjusting The number of modules can handle different gas volumes of waste gas. At the same time, the modules and reactor shells are assembled in a rail-type way, which is convenient and quick, and is suitable for large-scale industrial applications.

In addition, the present invention can be used alone as the core treatment equipment for medium and low concentration waste gas, can also be used in series or parallel according to the gas volume, and can also be used as a deep purification device in combination with other equipment such as washing towers and plasma equipment.

When in use, the gas to be treated enters the interior of the housing 8 through the gas inlet 1, and the air distribution through the air distribution plate 3 makes the air flow evenly and gently enter the catalytic reaction zone, and is irradiated by the ultraviolet lamp 6 and the catalyst on the catalyst plate 7. The gas to be treated is treated by the catalytic action of the gas, and after the treatment is completed, the gas goes out through the gas outlet 9.

Example 2

Preparation of Activated Carbon Buffered Photocatalytic Reactor

First, prepare the internal components of the reactor: cut the above-mentioned reactor honeycomb-shaped activated carbon-supported catalyst into a catalyst plate of 1650mm×1650mm×100mm, use aluminum alloy material as the outer frame to fix the catalyst plate; use 8 TUV25W ultraviolet lamps as a group of two The end is fixed on the stainless steel bracket (the distance between two adjacent lamp tubes is 235mm); the pretreatment activated carbon filter adopts activated carbon fiber bag filter, the size is 892mm×892mm, and the aluminum alloy bracket is used; the terminal activated carbon filter adopts CdS/ The activated carbon bag filter with _TiO2 spraying amount of 0.5g/cm2 also uses aluminum alloy bracket.

Process the main body of the reactor; the main body of the reactor is all made of 304 stainless steel, and the size of the rectangular main body is 3600mm×3600mm×4000mm. It is 3600mm×3600mm×6500mm, and 4 baffles are set at the square and round section of the entrance. The interior of the rectangular main body is divided into four cavities: upper, lower, left, and right by two horizontal and vertical partitions.

Reactor assembly: according to the pretreatment activated carbon filter, ultraviolet lamp tube, catalyst, and terminal activated carbon filter, the corresponding guide rails are processed in sequence. Among them, 6 sets of ultraviolet lamps and 6 catalysts are arranged in the unit cavity, arranged at intervals, and the distance between the ultraviolet lamp and the catalyst is 200mm, push the internal components into the reactor in order. Each chamber is equipped with a reactor door and a door lock, and an observation mirror is installed on the door.

The above-mentioned reactor is used to purify the waste gas treatment project of pharmaceutical enterprise sewage treatment plants containing organic pollutants such as methyl mercaptan and methyl sulfide. The gas volume is 100,000m ³ /h, and the waste gas enters the reactor from the inlet and is balanced and rectified by the pretreatment activated carbon filter. After the concentration is stabilized, it passes through 6 stages of reaction channels (ultraviolet lamp + honeycomb activated carbon-supported catalyst) in sequence, photocatalytic oxidation degradation occurs, and then undergoes deep adsorption and reaction through the terminal activated carbon filter, and the final degradation efficiency is >80%.

Example 3

An activated carbon buffered photocatalytic reactor, comprising a reactor housing 8, the two ends of the housing 8 are contracted openings, one side is a gas inlet 1, and the other side is a gas outlet 9; the outer surface of the housing 8 is provided with Side by side door 10 and glass window 11;

The main body inside the housing 8 is a catalytic reaction chamber 2, and the two ends of the catalytic reaction chamber 2 are respectively connected to the gas inlet 1 and the gas outlet 9; an air distribution plate 3 is arranged between the catalytic reaction chamber 2 and the gas inlet 1;

The catalytic reaction chamber 2 is provided with a partition 4 in the middle, and the catalytic reaction chamber 2 is divided into 2 to 6 reaction chambers by 1 to 5 layers of stainless steel partitions arranged perpendicular to the air intake direction, and each reaction chamber is arranged in rows The cloth is the same; between the partition 4 and the shell 8, perpendicular to the direction of the partition 4, a pretreatment activated carbon filter 5, a catalytic reaction zone and a terminal activated carbon filter 12 are arranged in sequence.

The air distribution plate 3 is at an angle of 15°-75° to the horizontal direction.

The pretreatment activated carbon filter is an activated carbon plate or bag filter, and the material in the filter is activated carbon or activated carbon fiber.

The catalytic reaction zone includes ultraviolet lamps 6 and catalyst plates 7, and the two are arranged parallel to each other alternately, and the distance between adjacent ultraviolet lamps and catalysts is 10 mm to 1 m.

The catalyst plate 7 is loaded with honeycomb activated carbon catalyst, the catalyst support material is aluminum honeycomb, the surface of the aluminum honeycomb is coated with 2 to 5 layers of activated carbon, and the catalyst is sprayed on the surface of the activated carbon, and the catalyst loading is 1% to 40% of the mass of the activated carbon. %.

The terminal activated carbon filter 12 is loaded with a catalyst, and the loading amount of the catalyst is 1%-20% of the mass of the activated carbon, and the catalyst is _TiO2 and CdS, and the amount of CdS is 0.1%-20% of the mass of the _TiO2. %. The pretreatment activated carbon filter 5, the ultraviolet lamp 6 and the catalyst plate 7 are inserted into the interior of the catalytic reaction chamber 2 through guide rails.

Claims (6)

1. an active carbon buffering photo catalysis reactor, it is characterized in that, comprise reactor shell (8), the two ends of housing (8) are contraction type opening, and side is gas access (1), and opposite side is gas vent (9); Housing (8) outer surface is provided with clamshell doors (10) and glass vision panel (11);

Described housing (8) inside subject is catalytic reaction chamber (2), and the two ends of catalytic reaction chamber (2) connect gas access (1) and gas vent (9) respectively; Air distribution plate (3) is provided with between catalytic reaction chamber (2) and gas access (1);

Dividing plate (4) is provided with in the middle of described catalytic reaction chamber (2), catalytic reaction chamber (2) is divided into 2 ~ 6 reaction chambers by 1 ~ 5 layer of stainless steel separator arranged perpendicular to airintake direction, and configurating of each reaction chamber is identical; Perpendicular to dividing plate (4) direction between dividing plate (4) and housing (8), be disposed with Pre-Treatment of Activated carbon filter (5), catalytic reaction zone and end active carbon filter (12).

2. a kind of active carbon buffering photo catalysis reactor as claimed in claim 1, it is characterized in that, described air distribution plate (3) is from the horizontal by 15 ° ~ 75 °.

3. a kind of active carbon buffering photo catalysis reactor as claimed in claim 1, is characterized in that, described Pre-Treatment of Activated carbon filter is the board-like or bag filter of active carbon, and the material in filter is active carbon or NACF.

4. a kind of active carbon buffering photo catalysis reactor as claimed in claim 1, it is characterized in that, catalytic reaction zone comprises uviol lamp (6) and catalyst plates (7), the alternately arrangement and both are parallel to each other, the distance of adjacent uviol lamp and catalyst is 10mm ~ 1m

Described catalyst plates (7) is with the activated carbon supported catalyst of honeycomb fashion, catalyst support material aluminium honeycomb, aluminium honeycomb surface scribbles 2 ~ 5 layers of active carbon, sprays catalyst again at activated carbon surface, and catalyst loadings is 1% ~ 40% of quality of activated carbon.

5. a kind of active carbon buffering photo catalysis reactor as claimed in claim 1, it is characterized in that, described end active carbon filter (12) load has catalyst, and the load capacity of catalyst is the 1%-20% of quality of activated carbon, and described catalyst is TiO ₂and CdS, and the consumption of CdS is TiO ₂0.1% ~ 20% of quality.

6. active carbon buffering photo catalysis reactor as claimed in claim 1 or 2, it is characterized in that, it is inner that Pre-Treatment of Activated carbon filter (5), uviol lamp (6) and catalyst plates (7) insert catalytic reaction chamber (2) by guide rail.