CN107837678A - Photocatalytic adsorption equipment and method for treating waste gas - Google Patents

Abstract

The invention discloses a photocatalytic adsorption device for treating waste gas, which comprises a water curtain cabinet, a first connecting pipe, a UV photolysis purifier, a second connecting pipe, an active carbon adsorption box, a third connecting pipe, a connector, a fan, a smoke exhaust pipe, an electric cabinet and a control panel, wherein one side of the top of the water curtain cabinet is connected with an inlet of the UV photolysis purifier through the first connecting pipe, an outlet of the UV photolysis purifier is connected with an inlet of the active carbon adsorption box through the second connecting pipe, an outlet of the active carbon adsorption box is connected with the connector through the third connecting pipe, the fan is fixed on one side of the connector through a bolt, the smoke exhaust pipe is installed on the top of the connector, the electric cabinet is connected with one side of the water curtain cabinet through a lead, the control panel is embedded into one side of the electric cabinet, and the UV photolysis purifier, the active carbon adsorption box and the fan are electrically connected with the control panel, the waste gas treatment device is simple in structure and convenient to use, and can effectively improve the waste gas treatment efficiency.

Description

Photocatalytic adsorption equipment and method for treating waste gas

technical field

The invention relates to the technical field of purification of organic waste gas by painting, in particular to a photocatalytic adsorption device and method for treating waste gas.

Background technique

The painting process is widely used in machinery, electrical equipment, home appliances, automobiles, ships, furniture and other industries. Spray paint raw materials are composed of non-volatile and volatile components. Non-volatile components include film-forming substances and auxiliary film-forming substances. Volatile components refer to curing agents and diluents. Diluents are added to reduce resin viscosity and improve its process performance. It is a liquid substance with good miscibility with resin. Adding a curing agent is to promote the rapid drying of the paint, increase the adhesion and strength of the paint surface, and improve the chemical stability of the paint. Paint spray exhaust gas is mainly composed of volatile curing agent, thinner molecules and non-volatile paint mist molecules. Due to the tiny particles of paint mist, high viscosity, and easy adhesion to the surface of substances, paint mist must be removed before purifying and recycling organic waste gas. Traditional paint mist removal methods are generally divided into wet and dry methods.

At present, domestic spray paint organic waste gas purification equipment mainly uses the principle of activated carbon adsorption. The disadvantage is that small-scale painting production lines are generally operated intermittently and the amount of paint mist is small. Due to the small amount of activated carbon adsorbing organic solvents, the conditions for organic solvent recovery cannot be met. In most cases, the activated carbon after adsorption saturation is discarded or sent to a professional. department to process. There is the problem of secondary pollution like this.

Contents of the invention

The object of the present invention is to provide a photocatalytic adsorption device and method for treating waste gas, so as to solve the problems raised in the above-mentioned background technology.

In order to achieve the above purpose, the present invention provides the following technical solutions: a photocatalytic adsorption device for treating exhaust gas, including a water curtain cabinet, a first connecting pipe, a UV photolysis purifier, a second connecting pipe, an activated carbon adsorption box, a second Three connecting pipes, connecting head, blower fan, exhaust pipe, electric control box and control panel, the top side of the water curtain cabinet is connected to the inlet of the UV photolysis purifier through the first connecting pipe, and the UV photolysis purification The outlet of the device is connected with the inlet of the activated carbon adsorption box through the second connecting pipe, and the outlet of the activated carbon adsorption box is connected with the connecting head through the third connecting pipe, and a fan is fixed on one side of the connecting head by bolts, and the connecting head A smoke exhaust pipe is installed on the top of the water curtain cabinet. One side of the water curtain cabinet is connected to an electric control box through a wire. One side of the electric control box is embedded with a control board, and the control board is electrically connected to the UV photolysis purifier. , activated carbon adsorption box and fan.

According to the above technical solution, the water curtain cabinet includes a cabinet body, a rotating motor, a filter screen, a first solenoid valve, a drain pipe, a sump, a water curtain nozzle, a waste gas collection hole, a water inlet pipe, a second solenoid valve, a suction fan, The driven pulley, the belt and the driving pulley, the top of the cabinet is provided with a sump, the top of the sump is fixed with a filter screen by bolts, the bottom of the sump is equipped with a drainage pipe, and the drainpipe A first solenoid valve is installed, and a waste gas collection hole is opened above the sump, and a suction fan is fixed in the waste gas collection hole through bolts, and a driven pulley is welded and fixed on the rotating shaft of the suction fan. The inner wall of one side of the body is fixed with a rotating motor by bolts. The output shaft of the rotating motor is equipped with a driving pulley, and the driving pulley and the driven pulley are connected by a belt. One side of the waste gas collection hole is installed with a water Curtain nozzle, the top of the cabinet is equipped with a water inlet pipe, and a second solenoid valve is installed on the water inlet pipe, the water inlet pipe is connected to the water curtain nozzle through a connecting pipe, and the control board is electrically connected to the rotating motor, the first Solenoid valve, second solenoid valve.

According to the above technical solution, the water curtain nozzle is provided with three layers.

According to the above technical solution, the UV photolysis purifier includes a first exhaust gas inlet, a defogging plate, a fixed bracket, a catalytic oxidation plate, a lamp holder bracket, a lamp holder, a purification box, a first exhaust gas outlet, a filter plate and an ultraviolet lamp The first exhaust gas inlet and the first exhaust gas outlet are respectively opened on the corresponding two sides of the purification box, and the top inner wall and the bottom inner wall of the purification box are fixed with a fixed bracket by welding, and the fixed bracket is close to the first exhaust gas inlet. One side is connected by a filter plate, and the filter plate is provided with two layers, one side of the filter plate is equipped with a demister plate, and the demist plate is provided with three layers, one side of the demist plate is equipped with a catalytic oxidation plate, And the lamp holder brackets are installed symmetrically between the catalytic oxidation plates, the lamp holders are uniformly distributed on the lamp holders, and the lamp holders are connected by ultraviolet lamp tubes, the defogging plate, the catalytic oxidation plate, the lamp holder bracket and the The filter plates are movably connected with the fixed bracket through bolts, and the control plate is electrically connected with the ultraviolet lamp tube.

According to the above technical solution, the catalytic oxidation plate is a nano-TiO2 photocatalyst or a nano-ZnO-SnO2 composite oxide photocatalyst supported on nickel foam.

According to the above technical solution, the activated carbon adsorption box includes a box body, a baffle plate, a through hole, an activated carbon adsorption layer, a replacement tank, a second exhaust gas outlet, a centrifugal fan, a fan chamber and a second exhaust gas inlet. A second exhaust gas outlet and a second exhaust gas inlet are respectively opened on the sides, and a baffle plate is fixed on the side close to the second exhaust gas inlet inside the box, and a fan chamber is opened at the center of the baffle plate, and the fan cavity is There are through holes around the cavity, and a centrifugal fan is fixed on the inner wall of one side of the fan cavity by bolts, an activated carbon adsorption layer is filled between the baffle plate and the second exhaust gas outlet, and a replacement is installed on one side of the box. slot, and the control board is electrically connected to the centrifugal fan.

A method for photocatalytic adsorption of exhaust gas, comprising the steps of:

1) Exhaust gas collection: collect the exhaust gas from the painting process through the exhaust gas collection hole and the suction fan, and at the same time prevent the spray paint from splashing and polluting the environment;

2) Photolysis treatment: use high-energy and high-ozone UV ultraviolet rays to decompose oxygen molecules in the air to generate free oxygen, that is, active oxygen. Because free oxygen is unstable, it needs to be combined with oxygen molecules to generate ozone, which has a strong oxidation effect. , can convert harmful organic waste gas into harmless carbon dioxide, water and other harmless waste gas, so that high-altitude emissions can meet the standards;

3) Adsorption treatment: use the activated carbon adsorption layer to perform secondary treatment on the waste gas after photolysis treatment, further improving the efficiency of waste gas treatment;

4) Exhaust gas emission: The exhaust gas after secondary treatment is discharged into the atmosphere through the exhaust pipe.

Compared with the prior art, the beneficial effect of the present invention is: the present invention can collect the organic waste gas through the water curtain cabinet provided, and the water curtain cabinet is provided with three layers of water curtain nozzles, which can effectively prevent the incomplete collection of organic waste gas and effectively improve the Collection efficiency: The structure of the UV photolysis purifier is simple and reasonable. By setting a catalytic oxidation plate and an ultraviolet lamp tube, the oxidation and decomposition of organic waste gas are strengthened, and two filter plates and three defogging plates are set at the exhaust gas inlet to control the organic waste gas. The pretreatment greatly enhances the catalytic oxidation plate and the ultraviolet lamp tube's ability to treat organic waste gas, thereby greatly improving the overall performance of the UV photolysis purifier. And the treatment effect is ideal; the activated carbon adsorption box uses the characteristics of activated carbon to adsorb organic waste gas to achieve the purpose of removal.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the waste gas treatment system of the present invention;

Fig. 2 is a schematic structural view of the water curtain cabinet of the present invention;

Fig. 3 is the structural representation of UV photolysis purifier of the present invention;

Fig. 4 is the structural representation of ultraviolet lamp tube of the present invention;

Fig. 5 is a schematic diagram of the internal structure of the activated carbon adsorption box of the present invention;

Fig. 6 is the waste gas treatment flowchart of the present invention;

Labels in the figure: 1. Water curtain cabinet; 2. First connecting pipe; 3. UV photolysis purifier; 4. Second connecting pipe; 5. Activated carbon adsorption box; 6. Third connecting pipe; 7. Connecting head; 8. Fan; 9. Smoke exhaust pipe; 10. Cabinet body; 11. Rotating motor; 12. Filter screen; 13. First solenoid valve; 14. Drainage pipe; 15. Pool; 16. Water curtain nozzle; 17. Exhaust gas collection hole; 18, water inlet pipe; 19, second solenoid valve; 20, suction fan; 21, driven pulley; 22, belt; 23, driving pulley; 24, first exhaust gas inlet; 25, defogging plate ; 26, fixed bracket; 27, catalytic oxidation plate; 28, lamp holder bracket; 29, lamp holder; 30, purification box; 31, first waste gas outlet; 32, filter plate; 33, ultraviolet lamp tube; ; 35, baffle plate; 36, through hole; 37, activated carbon adsorption layer; 38, replacement tank; 39, second exhaust gas outlet; 40, centrifugal fan; 41, fan cavity; 42, electric control box; 43, control panel; 44. The second waste gas inlet.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Please refer to Figures 1-6, the present invention provides a photocatalytic adsorption device for treating exhaust gas, including a water curtain cabinet 1, a first connecting pipe 2, a UV photolysis purifier 3, a second connecting pipe 4, and an activated carbon adsorption box 5. The third connecting pipe 6, connecting head 7, fan 8, smoke exhaust pipe 9, electric control box 42 and control panel 43, the top side of the water curtain cabinet 1 passes through the first connecting pipe 2 and the UV photolysis purifier 3 The inlet connection of the UV photolysis purifier 3 is connected with the inlet of the activated carbon adsorption box 5 through the second connecting pipe 4, and the outlet of the activated carbon adsorption box 5 is connected with the connecting head 7 through the third connecting pipe 6, and one part of the connecting head 7 A fan 8 is fixed on the side by bolts, a smoke exhaust pipe 9 is installed on the top of the connector 7, an electric control box 42 is connected to one side of the water curtain cabinet 1 through wires, and a control panel 43 is embedded in one side of the electric control box 42. The control board 43 is electrically connected to the UV photolysis purifier 3 , the activated carbon adsorption box 5 and the fan 8 .

According to the above technical scheme, the water curtain cabinet 1 includes a cabinet body 10, a rotating motor 11, a filter screen 12, a first solenoid valve 13, a drain pipe 14, a sump 15, a water curtain nozzle 16, an exhaust gas collection hole 17, a water inlet pipe 18, Second electromagnetic valve 19, suction fan 20, driven pulley 21, belt 22 and driving pulley 23, the top of cabinet body 10 is provided with sump 15, and the top of sump 15 is fixed with strainer 12 by bolt, sump The bottom of 15 is equipped with drainpipe 14, and the first solenoid valve 13 is installed on the drainpipe 14, and the top of sump tank 15 is provided with exhaust gas collection hole 17, and in exhaust gas collection hole 17, be fixed with suction fan 20 by bolt, suction fan 20 The driven pulley 21 is welded and fixed on the rotating shaft of the cabinet body 10, and the rotating motor 11 is fixed on the inner wall of one side of the cabinet body 10 by bolts. The output shaft of the rotating motor 11 is equipped with a driving pulley 23, and the driving pulley 23 and the driven belt The wheel 21 is connected by a belt 22, a water curtain nozzle 16 is installed on one side of the waste gas collection hole 17, a water inlet pipe 18 is installed on the top of the cabinet body 10, and a second electromagnetic valve 19 is installed on the water inlet pipe 18, and the water inlet pipe 18 is connected to the water The curtain nozzle 16 is connected through a connecting pipe, and the control board 43 is electrically connected to the rotating motor 11 , the first solenoid valve 13 , and the second solenoid valve 19 .

According to the above technical solution, the water curtain nozzle 16 is provided with three layers.

According to the above technical solution, the UV photolysis purifier 3 includes a first exhaust gas inlet 24, a defogging plate 25, a fixed bracket 26, a catalytic oxidation plate 27, a lamp holder bracket 28, a lamp holder 29, a purification box 30, and a first exhaust gas outlet 31 , a filter plate 32 and an ultraviolet lamp 33, the corresponding two sides of the purification box 30 are respectively provided with a first exhaust gas inlet 24 and a first exhaust gas outlet 31, and the top inner wall and the bottom inner wall of the purification box 30 are fixed with a fixed bracket 26 by welding. The side of the bracket 26 close to the first exhaust gas inlet 24 is connected by a filter plate 32, and the filter plate 32 is provided with two layers, and one side of the filter plate 32 is equipped with a defogging plate 25, and the defogging plate 25 is provided with three layers. A catalytic oxidation plate 27 is installed on one side of the fog plate 25, and lamp holder brackets 28 are symmetrically installed between the catalytic oxidation plates 27, lamp holders 29 are evenly distributed on the lamp holder brackets 28, and ultraviolet lamp tubes are passed between the lamp holders 29 33 connection, defogging plate 25, catalytic oxidation plate 27, lamp holder bracket 28 and filter plate 32 are all movably connected with fixed bracket 26 through bolts, and control board 43 is electrically connected to ultraviolet lamp tube 33.

According to the above technical solution, the catalytic oxidation plate 27 is a nano-TiO2 photocatalyst or a nano-ZnO-SnO2 composite oxide photocatalyst supported on nickel foam.

According to the above technical solution, the activated carbon adsorption box 5 includes a box body 34, a baffle plate 35, a through hole 36, an activated carbon adsorption layer 37, a replacement tank 38, a second exhaust gas outlet 39, a centrifugal fan 40, a fan chamber 41 and a second exhaust gas inlet 44 The corresponding two sides of the box body 34 are provided with the second waste gas outlet 39 and the second waste gas inlet 44 respectively, and the side of the inside of the box body 34 close to the second waste gas inlet 44 is fixed with a baffle plate 35 by welding, and the center of the baffle plate 35 A fan chamber 41 is opened at the center of the fan chamber 41, and a through hole 36 is opened around the fan chamber 41. A centrifugal fan 40 is fixed on one side of the inner wall of the fan chamber 41 by bolts, and an activated carbon adsorption layer 37 is filled between the baffle plate 35 and the second exhaust gas outlet 39. A replacement slot 38 is installed on one side of the box body 34 , and the control board 43 is electrically connected to the centrifugal fan 40 .

A method for photocatalytic adsorption of exhaust gas, comprising the steps of:

1) Exhaust gas collection: collect the exhaust gas from the painting process through the exhaust gas collection hole and the suction fan, and at the same time prevent the spray paint from splashing and polluting the environment;

2) Photolysis treatment: use high-energy and high-ozone UV ultraviolet rays to decompose oxygen molecules in the air to generate free oxygen, that is, active oxygen. Because free oxygen is unstable, it needs to be combined with oxygen molecules to generate ozone, which has a strong oxidation effect. , can convert harmful organic waste gas into harmless carbon dioxide, water and other harmless waste gas, so that high-altitude emissions can meet the standards;

3) Adsorption treatment: use the activated carbon adsorption layer to perform secondary treatment on the waste gas after photolysis treatment, further improving the efficiency of waste gas treatment;

4) Exhaust gas emission: The exhaust gas after secondary treatment is discharged into the atmosphere through the exhaust pipe.

Based on the above, the advantage of the present invention is that the organic waste gas can be collected by the water curtain cabinet 1 provided in the present invention. The water curtain cabinet 1 is provided with three layers of water curtain nozzles 16, which can effectively prevent the incomplete collection of organic waste gas and effectively improve the collection. Efficiency: The UV photolysis purifier 3 has a simple and reasonable structure. By setting the catalytic oxidation plate 27 and the ultraviolet lamp 33, the oxidative decomposition of the organic waste gas is strengthened, and two filter plates 32 and three defogging plates are set at the waste gas inlet. 25 pre-treats the organic waste gas, which greatly enhances the processing capacity of the catalytic oxidation plate 27 and the ultraviolet lamp 33 for organic waste gas, thereby greatly improving the overall performance of the UV photolysis purifier, and at the same time, it is practical and easy to maintain. The treatment efficiency of organic waste gas is high and the treatment effect is ideal; the activated carbon adsorption box 5 uses the characteristics of activated carbon to adsorb organic waste gas to achieve the purpose of removal.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications and substitutions can be made to these embodiments without departing from the principle and spirit of the present invention. and modifications, the scope of the invention is defined by the appended claims and their equivalents.

Claims (7)

1. A photocatalytic adsorption device for treating exhaust gas, characterized in that it includes a water curtain cabinet (1), a first connecting pipe (2), a UV photolysis purifier (3), and a second connecting pipe (4) , activated carbon adsorption box (5), third connecting pipe (6), connecting head (7), fan (8), exhaust pipe (9), electric control box (42) and control panel (43), the water The top side of the curtain cabinet (1) is connected to the inlet of the UV photolysis purifier (3) through the first connecting pipe (2), and the outlet of the UV photolysis purifier (3) is connected through the second connecting pipe (4) It is connected to the inlet of the activated carbon adsorption box (5), and the outlet of the activated carbon adsorption box (5) is connected to the connection head (7) through the third connecting pipe (6), and one side of the connection head (7) is fixed by bolts There is a fan (8), a smoke exhaust pipe (9) is installed on the top of the connector (7), and an electric control box (42) is connected to one side of the water curtain cabinet (1) through a wire. One side of the box (42) is embedded with a control board (43), and the control board (43) is electrically connected to the UV photolysis purifier (3), the activated carbon adsorption box (5) and the fan (8). 2. A photocatalytic adsorption device for treating exhaust gas according to claim 1, characterized in that: the water curtain cabinet (1) includes a cabinet body (10), a rotating motor (11), a filter screen (12 ), the first solenoid valve (13), the drain pipe (14), the sump (15), the water curtain nozzle (16), the waste gas collection hole (17), the water inlet pipe (18), the second solenoid valve (19), Suction fan (20), driven pulley (21), belt (22) and driving pulley (23), the top of the cabinet (10) is provided with a sump (15), the sump (15) The filter net (12) is fixed on the top by bolts, the drainpipe (14) is installed at the bottom of the sump (15), and the first solenoid valve (13) is installed on the drainpipe (14), the sump A waste gas collection hole (17) is opened above (15), and a suction fan (20) is fixed in the waste gas collection hole (17) by bolts, and a driven pulley is welded and fixed on the rotating shaft of the suction fan (20) (21), the inner wall of one side of the cabinet (10) is fixed with a rotating motor (11) by bolts, the output shaft of the rotating motor (11) is equipped with a driving pulley (23), and the driving pulley ( 23) It is connected with the driven pulley (21) through the belt (22), the water curtain nozzle (16) is installed on one side of the waste gas collection hole (17), and the water inlet pipe is installed on the top of the cabinet (10) (18), and a second solenoid valve (19) is installed on the water inlet pipe (18), the water inlet pipe (18) is connected to the water curtain nozzle (16) through a connecting pipe, and the control board (43) is electrically connected to Rotary motor (11), first solenoid valve (13), second solenoid valve (19). 3. The photocatalytic adsorption device for treating exhaust gas according to claim 2, characterized in that: the water curtain nozzle (16) is provided with three layers. 4. A photocatalytic adsorption device for treating exhaust gas according to claim 1, characterized in that: the UV photolysis purifier (3) includes a first exhaust gas inlet (24), a defogging plate (25) , fixed bracket (26), catalytic oxidation plate (27), lamp holder bracket (28), lamp holder (29), purification box (30), first exhaust gas outlet (31), filter plate (32) and ultraviolet lamp (33), the first exhaust gas inlet (24) and the first exhaust gas outlet (31) are opened on the corresponding two sides of the purification box (30), and the top inner wall and bottom inner wall of the purification box (30) are fixed by welding There is a fixed bracket (26), the side of the fixed bracket (26) close to the first exhaust gas inlet (24) is connected by a filter plate (32), and the filter plate (32) is provided with two layers, the filter plate ( 32) is equipped with a demister plate (25) on one side, and the demister plate (25) is provided with three layers, and one side of the demister plate (25) is equipped with a catalytic oxidation plate (27), and the catalytic oxidation plate ( 27) are symmetrically installed with lamp holder brackets (28), the lamp holders (29) are evenly distributed on the lamp holder brackets (28), and the lamp holders (29) are connected by ultraviolet lamp tubes (33), so The defogging plate (25), catalytic oxidation plate (27), lamp holder bracket (28) and filter plate (32) are all movably connected to the fixed bracket (26) through bolts, and the control panel (43) is electrically connected to the ultraviolet light tube (33). 5. A photocatalytic adsorption device for treating exhaust gas according to claim 4, characterized in that: the catalytic oxidation plate (27) is nano-TiO2 photocatalyst or nano-ZnO-SnO2 composite loaded on nickel foam oxide photocatalyst. 6. A photocatalytic adsorption device for treating exhaust gas according to claim 1, characterized in that: the activated carbon adsorption box (5) includes a box body (34), a baffle (35), a through hole (36 ), activated carbon adsorption layer (37), replacement tank (38), second exhaust gas outlet (39), centrifugal fan (40), fan cavity (41) and second exhaust gas inlet (44), the box (34) A second exhaust gas outlet (39) and a second exhaust gas inlet (44) are respectively opened on the corresponding two sides of the box body (34), and a baffle plate ( 35), the center of the baffle (35) is provided with a fan cavity (41), and the periphery of the fan cavity (41) is provided with through holes (36), and the inner wall of one side of the fan cavity (41) passes through A centrifugal fan (40) is fixed by bolts, an activated carbon adsorption layer (37) is filled between the baffle plate (35) and the second exhaust gas outlet (39), and a replacement slot ( 38), the control board (43) is electrically connected to the centrifugal fan (40). 7. A method for photocatalytic adsorption of exhaust gas, characterized in that: comprising the steps of: 1) Exhaust gas collection: collect the exhaust gas from the painting process through the exhaust gas collection hole and the suction fan, and at the same time prevent the spray paint from splashing and polluting the environment; 2) Photolysis treatment: use high-energy and high-ozone UV ultraviolet rays to decompose oxygen molecules in the air to generate free oxygen, that is, active oxygen. Because free oxygen is unstable, it needs to be combined with oxygen molecules to generate ozone, which has a strong oxidation effect. , can convert harmful organic waste gas into harmless carbon dioxide, water and other harmless waste gas, so that high-altitude emissions can meet the standards; 3) Adsorption treatment: use the activated carbon adsorption layer to perform secondary treatment on the waste gas after photolysis treatment, further improving the efficiency of waste gas treatment; 4) Exhaust gas emission: The exhaust gas after secondary treatment is discharged into the atmosphere through the exhaust pipe.