Combined equipment for comprehensively treating printing waste gas

Abstract

The utility model discloses combined equipment for comprehensive treatment of printing waste gas, including suction mechanism, first waste gas treatment mechanism, second waste gas treatment mechanism and controller, suction mechanism includes suction hood group, suction pipeline, first waste gas treatment mechanism includes filter group, compression group and separation rectification group, second waste gas treatment mechanism includes filter group, compression group and separation rectification group. The second waste gas treatment mechanism comprises a preheating box and a combustion box; when the air suction mechanism, the first waste gas treatment mechanism, the second waste gas treatment mechanism and the controller are combined for use, an organic solvent in mixed waste gas can be effectively recovered, and the organic solvent recovery device is simple in structure, reasonable in design, low in cost, convenient to operate and high in recovery efficiency, and has good economic benefits and social benefits.

Description

Technical Field

[0001] The utility model relates to the technical field of waste gas treatment, in particular to a combined device for comprehensively treating printing waste gas. Background Art

[0002] A printing press is a machine for printing text and images. Modern printing presses are generally composed of mechanisms such as plate loading, inking, embossing, and paper feeding (including folding). Its working principle is: first, the text and image to be printed are made into a printing plate and mounted on a printing press. Then, ink is applied to the places with text and images on the printing plate manually or by a printing press, and then directly or indirectly transferred to paper or other substrates (such as textiles, metal plates, plastics, leather, wood boards, glass and ceramics), thereby replicating a printed product identical to the printing plate.

[0003] Printing machines generate waste gas when working. The main source of waste gas is ink. Ink is a uniform mixture of colored bodies (such as pigments, dyes, etc.), binders, fillers, additives and other substances. It can print and dry on the printed body. It is a colored, fluid, slurry-like adhesive.

[0004] There are many types of inks with different physical properties. Some are very thick and sticky, while others are quite thin. Some use vegetable oil as a binder; some use resin and solvent or water as a binder; some use organic solvents such as toluene, xylene, gasoline, alcohol, etc. Therefore, the composition of the waste gas generated by printing is relatively complex depending on the type of ink used. The waste gas generated by some inks contains a large amount of VOC gas, while the waste gas generated by some inks contains a large amount of recyclable substances such as alcohol with high recycling value.

[0005] The above-mentioned printing waste gas spreads into the production workshop, which will lead to a bad working environment, affect the air quality, and seriously affect the health of the workshop workers. At present, many workshops will install exhaust fans to quickly discharge the waste gas generated in the workshop. This method eliminates the waste gas in the workshop to a certain extent, but on the one hand, the exhaust gas is not discharged completely, and the direct discharge of the waste gas will pollute the environment. On the other hand, some recyclable substances in the waste gas cannot be recycled, wasting reusable substances such as solvents. Summary of the invention

[0006] In order to solve the above problems, the utility model provides a printing waste gas comprehensive treatment combined equipment which can classify, collect and treat waste gases of different components.

[0007] To achieve the above-mentioned purpose, the utility model adopts the following technical solution: a combined device for comprehensive treatment of printing waste gas, including an air suction mechanism, a first waste gas treatment mechanism, a second waste gas treatment mechanism and a controller, and the controller is installed in a position in the printing workshop that is convenient for operation.

[0008] The air suction mechanism includes an air suction hood group and an air suction pipeline. The number of the air suction hood groups is the same as the number of printing machines in the printing workshop. Each air suction hood group consists of an outer suction hood and an inner suction hood. The number of the inner suction hoods is 2-4. The air suction end of the inner suction hood leads to the cabinet of the printing machine, and its suction port faces the ink printing position of the printing machine. The outer suction hood is arranged above the printing machine, and the inner suction hood and the outer suction hood are connected with the air inlet end of the air suction pipeline through a connecting pipe. A suction pump is installed on the air suction pipeline, and the suction pump is electrically connected to the controller. A shunt pipe is provided at the air outlet end of the air suction pipeline. The shunt pipe is a three-way pipe. One interface of the shunt pipe is an air inlet, and the other two interfaces are air outlets. The air inlet is connected with the air outlet end of the air suction pipeline. The two air outlets are a first air outlet and a second air outlet, respectively. A first solenoid valve and a second solenoid valve are respectively installed on the air outlet ends of the first air outlet and the second air outlet, and the two solenoid valves are connected to the controller through wires.

[0009] The first exhaust gas treatment mechanism includes a filtering group, a compression group and a separation and distillation group. The filtering group includes a bag dust collector and an activated carbon filter box. The bag dust collector is arranged on one side of the air outlet end of the air intake pipe, and its air inlet is connected to the first air outlet of the air intake pipe. The activated carbon filter box is arranged on one side of the bag dust collector, and detachable activated carbon plates are equidistantly installed in the box body. The air inlet end is connected to the air outlet end of the bag dust collector through a pipe.

[0010] The compression group is composed of an expander and a cooler connected by a pipeline, and the air inlet end of the expander is connected to the air outlet end of the activated carbon filter box; the separation and distillation group includes a separation tower and a distillation tower. There are two separation towers, namely, separation tower No. 1 and separation tower No. 2. The bottom of the separation tower No. 1 is provided with a drain pipe, the upper part is provided with a feed pipe, the top is provided with an exhaust pipe, and a gas-liquid separator is installed in the middle and lower parts. The separation tower No. 1 is arranged on one side of the compression group, and the feed end is connected to the discharge end of the compression group. The structure of the separation tower No. 2 is the same as that of the separation tower No. 1, and it is arranged on one side of the separation tower No. 1. The feed end of the separation tower No. 2 is connected to the discharge end of the separation tower No. 1 through a suction pump and a pipeline. The distillation tower is located on one side of the separation tower No. 2, and its feed end is connected to the discharge end of the separation tower No. 2.

[0011] The second exhaust gas treatment mechanism includes a preheating box and a combustion box. The preheating box is located on one side of the air outlet end of the air intake duct, and its air inlet end is connected to the second air outlet of the breathing duct. An electric heating rod is installed on the top of the preheating box, and a temperature monitoring sensor is installed on the bottom.

[0012] The combustion box is arranged on one side of the preheating box, and its air inlet end is connected with the air outlet end of the preheating line through a pipeline with a non-return component. A burner is installed inside the combustion box, a combustion catalyst bed is arranged on the inner wall of the box body, and an exhaust pipe is fixed on the top of the combustion box.

[0013] The electric control components of the first exhaust gas treatment mechanism and the second exhaust gas treatment mechanism are connected to the controller through wires.

[0014] As an optimization solution of this case, a third exhaust gas treatment mechanism is provided at the exhaust end of the first exhaust gas treatment mechanism and the second exhaust gas treatment mechanism.

[0015] Furthermore, the third exhaust gas treatment mechanism includes a treatment pipeline, an adsorption box, a filter box and a drying box. The treatment pipeline is a three-way structure pipe, one of the interfaces is an air outlet, and the other two ports are air inlets. The two air inlets are respectively a first air inlet and a second air inlet, and the air inlet ends of the first air inlet and the second air inlet are respectively installed with non-return components. The first air inlet is connected to the air outlet ends of the No. 1 separation tower and the No. 2 separation tower through a connecting pipe, and the second air inlet is connected to the exhaust pipe of the combustion box.

[0016] The air inlet end of the adsorption box is connected with the air outlet of the treatment pipeline, and activated carbon adsorption cotton plates are vertically arranged equidistantly from left to right in the adsorption box. The filter box is arranged at one side of the adsorption box, and the filter box is filled with filtered liquid. An air inlet pipe is arranged on the left side of the box body, and an air outlet pipe is arranged on the right side. The bottom end of the air inlet pipe of the filter box penetrates into the filtered liquid in the box, and the end of the air inlet pipe of the filter box is a spherical structure and a plurality of air outlet holes are opened on the sphere. The air inlet pipe of the filter box is connected with the air outlet pipe of the adsorption box of the adsorption box. The drying box is arranged at one side of the filter box, and a plurality of double-layer mesh panels are equidistantly arranged in the drying box. Desiccant particles are arranged in the interlayer of the double-layer mesh panels. A drain pipe is arranged at the bottom of the box body, and the air inlet pipe of the drying box is connected with the air outlet pipe of the filter box.

[0017] Beneficial effects: ①. The utility model can classify and treat the waste gas generated when printing with different inks by setting up an air suction mechanism, a first waste gas treatment mechanism, a second waste gas treatment mechanism and a controller in combination. When alcohol-soluble ink is used, and its tail gas mainly contains high-value recyclable substances such as alcohol, the first waste gas treatment mechanism is used to recycle the recyclable substances in the waste gas; when ester-soluble ink is used, and its tail gas mainly contains VOC waste gas such as benzene and esters, which are difficult to recycle and environmentally unfriendly substances, the second waste gas treatment mechanism is used to perform catalytic oxidation and combustion treatment on the waste gas to remove particulate impurities in the VOC gas. The treated gas will not pollute the environment, and the waste gas meets environmental emission requirements. Moreover, after the waste gas is treated, the organic solvent in the mixed waste gas can be effectively recovered. It has a simple structure, reasonable design, low cost, convenient operation, and high recovery efficiency, and has good economic and social benefits.

[0018] ②. By setting up the third waste gas treatment mechanism, the waste gas can be subjected to final adsorption, filtration and drying treatment, which can effectively reduce environmental pollution and greatly reduce the impact on workers' health. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the utility model.

[0020] Figure 2 It is a structural schematic diagram of the first exhaust gas treatment mechanism in the utility model.

[0021] Figure 3 It is a structural schematic diagram of the second exhaust gas treatment mechanism in the utility model.

[0022] Figure 4 This is a schematic diagram of the structure of the utility model in Example 2.

[0023] Figure 5 It is a structural schematic diagram of the third exhaust gas treatment mechanism in the utility model.

[0024] In the figure: 1. controller; 2. diverter pipe; 3. bag filter; 4. activated carbon filter box; 5. compression group; 6. distillation tower; 7. separation tower No. 1; 8. separation tower No. 2; 9. gas-liquid separator; 10. preheating box; 11. combustion box; 12. electric heating rod; 13. temperature monitoring sensor; 14. burner; 15. catalyst bed; 16. adsorption box; 17. filter box; 18. drying box. DETAILED DESCRIPTION

[0025] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0026] The same parts are denoted by the same reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the drawings, and the words "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively. The drawings are all in a very simplified form and use inaccurate ratios, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the utility model. Example 1

[0027] like Figure 1-3 As shown, this embodiment discloses a combined device for comprehensive treatment of printing waste gas, which is used for recycling and treating the waste gas generated in the printing workshop, and specifically includes an air suction mechanism, a first waste gas treatment mechanism, a second waste gas treatment mechanism and a controller 1, and the controller 1 is installed in a position convenient for operation in the printing workshop.

[0028] See also Figure 1 The suction mechanism includes a suction hood group and a suction pipeline. The number of the suction hood groups is the same as the number of printing machines in the printing workshop. Each suction hood group consists of an outer suction hood and an inner suction hood. The number of the inner suction hoods is 2-4. The suction end of the inner suction hood leads into the cabinet of the printing machine, and its suction port faces the ink printing position of the printing machine. The outer suction hood is arranged above the printing machine, and the inner suction hood and the outer suction hood are connected to the air inlet end of the suction pipeline through a connecting pipe. A suction pump is installed on the suction pipeline, and the suction pump is electrically connected to the controller 1. A shunt pipe 2 is provided at the air outlet end of the suction pipeline, from Figure 1 It can be seen that the diverter pipe 2 is a three-way pipe, one interface of the diverter pipe 2 is an air inlet, and the other two interfaces are air outlets. The air inlet is connected to the air outlet end of the air intake pipe, and the two air outlets are respectively the first air outlet and the second air outlet, and the first solenoid valve and the second solenoid valve are respectively installed on the air outlet ends of the first air outlet and the second air outlet, and the two solenoid valves are connected to the controller 1 through wires.

[0029] See also Figure 1 , Figure 2 The first exhaust gas treatment mechanism includes a filtering group, a compression group 5 and a separation and distillation group. The filtering group includes a bag dust collector 3 and an activated carbon filter box 4. The bag dust collector 3 is arranged on one side of the air outlet end of the air intake pipe, and its air inlet is connected to the first air outlet of the air intake pipe. The activated carbon filter box 4 is arranged on one side of the bag dust collector 3. Removable activated carbon plates are equidistantly installed in the box body, and its air inlet end is connected to the air outlet end of the bag dust collector 3 through a pipe.

[0030] from Figure 2It can be seen that the compression group 5 is composed of an expander and a cooler connected by a pipeline, and the air inlet end of the expander is connected to the air outlet end of the activated carbon filter box 4; the separation and distillation group includes a separation tower and a distillation tower 6, and the number of the separation towers is two, namely, separation tower No. 1 7 and separation tower No. 2 8. The bottom of the separation tower No. 1 is provided with a drain pipe, the upper part is provided with a feed pipe, the top is provided with an exhaust pipe, and a gas-liquid separator 9 is installed in the middle and lower part. The separation tower No. 1 is arranged on one side of the compression group 5, and the feed end is connected to the discharge end of the compression group 5. The structure of the separation tower No. 2 is the same as that of the separation tower No. 1, which is arranged on one side of the separation tower No. 1, and the feed end of the separation tower No. 2 is connected to the discharge end of the separation tower No. 1 through a suction pump and a pipeline. The distillation tower 6 is located on one side of the separation tower No. 2, and its feed end is connected to the discharge end of the separation tower No. 2.

[0031] See also Figure 1 and Figure 3 The second exhaust gas treatment mechanism includes a preheating box 10 and a combustion box 11. For specific structures, see Figure 3 The preheating box 10 is located at one side of the air outlet end of the air intake duct, and its air inlet end is connected to the second air outlet of the breathing duct. An electric heating rod 12 is installed on the top of the preheating box 10, and a temperature monitoring sensor 13 is installed on the bottom.

[0032] from Figure 3 It can be seen that the combustion box 11 is arranged on one side of the preheating box 10, and its air inlet end is connected to the air outlet end of the preheating line through a pipe with a non-return component. A burner 14 is installed inside the combustion box 11, a combustion bed layer 15 is arranged on the inner wall of the box body, and an exhaust pipe is fixed to the top of the combustion box 11.

[0033] See also Figure 1 The electronic control components of the first exhaust gas treatment mechanism and the second exhaust gas treatment mechanism are connected to the controller 1 through wires. Example 2

[0034] like Figure 2-5 As shown, the specific structure and implementation are the same as in Example 1, except that a third exhaust gas treatment mechanism is provided at the exhaust end of the first exhaust gas treatment mechanism and the second exhaust gas treatment mechanism.

[0035] See also Figure 4 and Figure 5The third exhaust gas treatment mechanism includes a treatment pipeline, an adsorption box 16, a filter box 17 and a drying box 18. The treatment pipeline is a three-way structure pipe, one of which is an air outlet, and the other two are air inlets. The two air inlets are respectively a first air inlet and a second air inlet, and the air inlet ends of the first air inlet and the second air inlet are respectively installed with non-return components. The first air inlet is connected to the air outlet ends of the No. 1 separation tower 7 and the No. 2 separation tower 8 through a connecting pipe, and the second air inlet is connected to the exhaust pipe of the combustion box 11.

[0036] from Figure 5 It can be seen that the air inlet end of the adsorption box 16 is connected with the air outlet of the treatment pipeline, and activated carbon adsorption cotton plates are vertically arranged equidistantly from left to right in the adsorption box 16. The filter box 17 is arranged on one side of the adsorption box 16, and the filter box 17 is filled with filtrate. An air inlet pipe is arranged on the left side of the box body, and an air outlet pipe is arranged on the right side. The bottom end of the air inlet pipe of the filter box 17 penetrates into the filtrate in the box, and the end of the air inlet pipe of the filter box 17 is a spherical structure and a plurality of air outlet holes are opened on the sphere. The air inlet pipe of the filter box is connected with the air outlet pipe of the adsorption box 16 of the adsorption box 16. The drying box 18 is arranged on one side of the filter box 17, and a plurality of double-layer mesh panels are equidistantly arranged in the drying box 18, and desiccant particles are arranged in the interlayer of the double-layer mesh panels. A drain pipe is arranged at the bottom of the box body, and the air inlet pipe of the drying box 18 is connected with the air outlet pipe of the filter box 17.

[0037] When in use, the organic waste gas generated by the printing press is sucked and collected by the suction mechanism. For example, when the ink used for printing is alcohol-soluble ink and its tail gas mainly contains high-value recyclable substances such as alcohol, the controller 1 opens the first solenoid valve and closes the second solenoid valve, so that the recyclable waste gas enters the first waste gas treatment mechanism for treatment. At this time, the waste gas first passes through the bag filter 3 for preliminary treatment of the dust mixed in the waste gas, and then enters the activated carbon filter box 4 to remove the colloid particles in the waste gas, and then reaches the expander and cooler of the compression group 5. The gas is compressed and cooled and then transported to the No. 1 separation tower 7. When it arrives in the No. 1 separation tower 7, the gas-liquid separator 9 liquefies and separates the solvent therein and settles it at the bottom of the tower. The purified and separated gas is discharged, and the separated solution continues to be transported forward to the No. 2 separation tower 8 for secondary separation and purification, and then transported to the distillation tower 6 for further distillation and purification before recycling.

[0038] When ester-soluble ink is used for printing, and its tail gas mainly contains VOC waste gas such as benzene and esters, which are difficult to recycle and environmentally unfriendly substances, the controller 1 opens the second solenoid valve and closes the first solenoid valve, so that the recyclable waste gas enters the second waste gas treatment mechanism for treatment. At this time, the controller 1 turns on the electric heating rod 12 in the preheating box 10 to heat the box body, and the temperature monitoring sensor 13 monitors the temperature in real time. When the temperature in the box body is within the preset value, the passing VOC waste gas is preheated, and then the preheated waste gas is passed into the combustion box 11, and the VOC waste gas is burned and purified through the catalyst layer bed and the started burner 14, and then the purified gas is discharged from the exhaust pipe.

[0039] Finally, the gas after purification, recovery or combustion purification enters the filter box 17. When it reaches the first-level filter box 17, it passes through the activated carbon adsorption panel in turn. The activated carbon adsorption cotton board performs primary adsorption on the residual pollutants in the airflow. When the exhaust gas continues to move forward to the filter box 17, the airflow first passes into the filtrate, and the filtrate filters the pollutants and impurities in the airflow. Finally, the purified airflow enters the drying box 18, and the airflow passes through each double-layer net in turn. The desiccant particles in the double-layer net adsorb the moisture in the airflow and reduce the humidity before being released.

[0040] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A combined device for comprehensive treatment of printing waste gas, comprising an air suction mechanism, a first waste gas treatment mechanism, a second waste gas treatment mechanism and a controller (1), wherein the controller (1) is installed in a convenient position in a printing workshop; characterized in that: The suction mechanism includes a suction hood group and a suction pipeline. The number of the suction hood groups is the same as the number of printing machines in the printing workshop. Each suction hood group consists of an outer suction hood and an inner suction hood. The number of the inner suction hoods is 2-4. The suction end of the inner suction hood leads into the cabinet of the printing machine, and the suction port faces the ink printing position of the printing machine. The outer suction hood is arranged above the printing machine, and the inner suction hood and the outer suction hood are connected to the air inlet end of the suction pipeline through a connecting pipe. A suction pump is installed on the suction pipeline to suck The pump is electrically connected to the controller (1); a shunt pipe (2) is provided at the air outlet end of the air intake pipe; the shunt pipe (2) is a three-way pipe; one interface of the shunt pipe (2) is an air inlet, and the other two interfaces are air outlets; the air inlet is connected to the air outlet end of the air intake pipe; the two air outlets are respectively a first air outlet and a second air outlet; and a first solenoid valve and a second solenoid valve are respectively installed on the air outlet ends of the first air outlet and the second air outlet; the two solenoid valves are connected to the controller (1) via wires; The first exhaust gas treatment mechanism comprises a filtering group, a compression group (5) and a separation and distillation group, the filtering group comprises a bag filter (3) and an activated carbon filter box (4), the bag filter (3) is arranged on one side of the air outlet end of the air intake pipe, and its air inlet is connected to the first air outlet of the air intake pipe, the activated carbon filter box (4) is arranged on one side of the bag filter (3), and detachable activated carbon plates are installed in the box body at equal intervals, and its air inlet is connected to the air outlet end of the bag filter (3) through a pipe; The compression group (5) is composed of an expander and a cooler connected by a pipeline, and the air inlet end of the expander is connected to the air outlet end of the activated carbon filter box (4); the separation and distillation group includes a separation tower and a distillation tower (6), and the number of the separation towers is two, namely a No. 1 separation tower (7) and a No. 2 separation tower (8). The No. 1 separation tower (7) is provided with a discharge pipe at the bottom, a feed pipe at the top, an exhaust pipe at the top, and a gas-liquid separator (9) is installed in the middle and lower part. The No. 1 separation tower (7) is arranged on one side of the compression group (5), and the feed end is connected to the discharge end of the compression group (5). The No. 2 separation tower (8) has the same structure as the No. 1 separation tower (7), and is arranged on one side of the No. 1 separation tower (7). The feed end of the No. 2 separation tower (8) is connected to the discharge end of the No. 1 separation tower (7) through a suction pump and a pipeline. The distillation tower (6) is located on one side of the No. 2 separation tower (8), and its feed end is connected to the discharge end of the No. 2 separation tower (8); The second exhaust gas treatment mechanism comprises a preheating box (10) and a combustion box (11); the preheating box (10) is located on one side of the air outlet end of the air intake duct, and its air inlet end is connected to the second air outlet of the breathing duct; an electric heating rod (12) is installed at the top of the preheating box (10), and a temperature monitoring sensor (13) is installed at the bottom; The combustion box (11) is arranged on one side of the preheating box (10), and its air inlet end is connected to the air outlet end of the preheating line through a pipeline with a non-return component. A burner (14) is installed inside the combustion box (11), and a combustion catalyst bed (15) is arranged on the inner wall of the box body. An exhaust pipe is fixed to the top of the combustion box (11); The electrical control components of the first exhaust gas treatment mechanism and the second exhaust gas treatment mechanism are connected to the controller (1) via wires.

2. The combined equipment for comprehensive treatment of printing waste gas according to claim 1 is characterized in that: A third exhaust gas treatment mechanism is provided at the exhaust ends of the first exhaust gas treatment mechanism and the second exhaust gas treatment mechanism.

3. The combined equipment for comprehensive treatment of printing waste gas according to claim 2 is characterized in that: The third exhaust gas treatment mechanism comprises a treatment pipeline, an adsorption box (16), a filter box (17) and a drying box (18); the treatment pipeline is a three-way structure pipe, one of the interfaces is an air outlet, and the other two interfaces are air inlets, the two air inlets are respectively a first air inlet and a second air inlet, and the air inlet ends of the first air inlet and the second air inlet are respectively installed with a non-return component, the first air inlet is connected to the air outlet ends of the first separation tower (7) and the second separation tower (8) through a connecting pipe, and the second air inlet is connected to the exhaust pipe of the combustion box (11); The air inlet end of the adsorption box (16) is connected to the air outlet of the treatment pipeline. The adsorption box (16) is vertically provided with activated carbon adsorption cotton plates equidistantly from left to right. The filter box (17) is arranged on one side of the adsorption box (16). The filter box (17) contains filtered liquid. The bottom end of the air inlet pipe of the filter box (17) penetrates into the filtered liquid in the box. The end of the air inlet pipe of the filter box (17) is a spherical structure and a plurality of air outlet holes are opened on the sphere. The air inlet pipe of the filter box is connected to the air outlet pipe of the adsorption box (16). The drying box (18) is arranged on one side of the filter box (17). A plurality of double-layer mesh panels are equidistantly provided in the drying box (18). Desiccant particles are provided in the interlayer of the double-layer mesh panels. A drainage pipe is provided at the bottom of the box. The air inlet pipe of the drying box (18) is connected to the air outlet pipe of the filter box (17).

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