Efficient pretreatment system for printing and dyeing sludge drying waste gas

Abstract

The utility model discloses a high-efficiency pretreatment system for printing and dyeing sludge drying waste gas, belongs to the technical field of waste gas treatment, and solves the problems that the volume of the interior of a spray tower is obviously reduced due to the fact that solid particles in the spray tower obviously occupy and affect the volume of the interior of the spray tower in a day-by-day period. And if the spray tower is in a bottom gas inlet state, the solid particles may hinder the gas inlet of the flue gas. Comprising a spraying tower and a smoke inlet pipe which is fixedly connected to the peripheral wall and is arranged in a communicating mode, an annular blocking cover located above the smoke inlet pipe is arranged in the spraying tower, and the annular blocking cover comprises an annular disc part fixedly connected to the inner ring of the spraying tower and a round pipe part fixedly connected with the annular disc part. Solid particles are recycled through the annular blocking cover, water and particles are carried by the circulating assembly to flow, the annular blocking cover is washed and kept clean, and when necessary, waste water and particles are discharged through the inlet and outlet pipe, new water is supplemented to continue to bear the solid particles, and accumulation of the particles in the spray tower is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of waste gas treatment, in particular to a high-efficiency pretreatment system for waste gas from drying printing and dyeing sludge. Background Art

[0002] After the printing and dyeing sludge is heated and dehydrated by the disc dryer, the waste gas generated by evaporation is still at a high temperature (60-70℃) after condensation, and contains acidic gases and water-soluble VOCs. There is a phenomenon of water vapor supersaturation. If it enters the rear-end activated carbon adsorption box, it will condense more water, affecting the normal operation of the activated carbon adsorption box. At the same time, it is highly corrosive to the equipment. Therefore, it is necessary to pre-treat the waste gas before entering the activated carbon adsorption box, further remove water vapor and deacidify it, and then discharge it into the activated carbon adsorption box.

[0003] In order to treat the flue gas in advance, the flue gas and the spray mist particles are fully in contact during the upward flow process, so that the temperature of the original gas drops, and then the gas-liquid separation is carried out through the cyclone plate. The separated gas enters the activated carbon adsorption box for adsorption and is discharged into the air through an independent discharge port, namely the chimney.

[0004] However, the gas after separation can leave smoothly, but the solid particles separated from the flue gas will be retained in the spray tower and cannot be cleaned. Over time, the solid particles inside will have a significant impact on the volume inside the spray tower, resulting in a significant reduction in the amount of flue gas it can carry. If the spray tower is in a bottom air intake state, these solid particles may also hinder the intake of flue gas. Therefore, it is necessary to clean the solid particles in the spray tower in the pretreatment system to reduce blockage and volume occupation problems.

[0005] Therefore, an efficient pretreatment system for printing and dyeing sludge drying waste gas is proposed to solve or alleviate the above problems. Utility Model Content

[0006] The utility model aims to solve the shortcomings in the prior art and proposes a high-efficiency pretreatment system for waste gas from drying printing and dyeing sludge.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A high-efficiency pretreatment system for waste gas from drying printing and dyeing sludge, comprising a spray tower, a smoke inlet pipe fixedly connected to the outer peripheral wall and connected thereto, an annular baffle cover located above the smoke inlet pipe is arranged in the spray tower, the annular baffle cover comprises a circular disk portion fixedly connected to the inner circle of the spray tower, and a circular tube portion fixedly connected to the circular disk portion, the horizontal height of the top surface of the circular disk portion gradually decreases from the center of the circle outward, and the cross-section of the circular tube portion gradually increases from top to bottom, a circulation component connected thereto is fixedly connected to the outer peripheral wall of the spray tower, the lowest horizontal height of the feed port of the circulation component is the same as the lowest horizontal height of the top surface of the circular disk portion, and the discharge port of the circulation component is located between the circular tube portion and the inner peripheral wall of the spray tower.

[0009] Preferably, a filter convex screen covering its opening is fixedly connected to the upper end of the circular tube portion, the outer diameter of the filter convex screen gradually increases from top to bottom, and a plurality of filter holes are provided on its outer peripheral wall, and the apertures of the plurality of filter holes are gradually increased from top to bottom along the height direction of the filter convex screen.

[0010] Preferably, the circulation component includes a recovery pipe connected to the spray tower, a reduction pipe connected to the recovery pipe, a return pipe connected to the reduction pipe and extending into the spray tower, and a water outlet pipe connected to the return pipe and between the inner wall of the spray tower and the circular tube portion. A circulation pump may be connected to the return pipe.

[0011] Preferably, a ring-shaped filter screen is fixedly connected inside the return pipe, and the horizontal height of the filter screen is gradually reduced from the center of the circle toward the outside.

[0012] Preferably, the circulation component also includes an inlet and outlet pipe that penetrates the outer wall of the shrinking pipe and is connected to it, and an inlet pipe and an outlet pipe that are connected to one end of the inlet and outlet pipe away from the shrinking pipe. The inlet and outlet pipes are located below the shrinking pipe, and both the inlet and outlet pipes can be connected to solenoid valves. The inlet pipe is used to connect to an external water source, and the outlet pipe is used for discharge.

[0013] Preferably, it also includes a liquid storage tank, which is connected to a connecting pipe. The connecting pipe passes through the spray tower and is connected to a plurality of atomizing nozzles, and the horizontal height of the atomizing nozzle is greater than the horizontal height of the circulation component. The connecting pipe is connected to a spray pump.

[0014] Preferably, it also includes a smoke exhaust pipe connected to the top of the spray tower, an activated carbon box connected to the smoke exhaust pipe, and a chimney connected to the activated carbon box, and a centrifugal fan is connected to the connection between the chimney and the activated carbon box.

[0015] The utility model has the following beneficial effects:

[0016] The utility model can recycle fallen solid particles through the annular baffle, and the filtering convex net can allow the smoke to circulate normally and reduce the amount of smoke falling thereon, and then the water therein is made to flow with the solid particles through the circulation component, so that the solid particles are mainly carried in the circulation component, and the annular baffle is flushed at the same time to keep the annular baffle as clean as possible. When there are many solid particles or the water therein is too turbid, the discharge of wastewater and solid particles is completed through the inlet and outlet pipes, and water is added again to carry the solid particles, so that the smoke can be filtered and discharged normally, and the accumulation of solid particles in the spray tower can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model;

[0018] Figure 2 It is a cross-sectional view of the spray tower in the utility model.

[0019] 1. Spray tower; 2. Smoke exhaust pipe; 3. Activated carbon box; 4. Centrifugal fan; 5. Chimney; 6. Liquid storage tank; 7. Connecting pipe; 8. Spray pump; 9. Smoke inlet pipe; 10. Annular baffle; 11. Filter convex net; 12. Recovery pipe; 13. Constricted pipe; 14. Reflux pipe; 15. Water outlet pipe; 16. Filter net; 17. Inlet and outlet pipes; 18. Outlet pipe; 19. Inlet pipe. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0021] A high-efficiency pretreatment system for waste gas from printing and dyeing sludge drying, such as Figure 1 As shown, it includes a spray tower 1, a smoke inlet pipe 9 fixedly connected to the outer wall and connected, a liquid storage tank 6, a smoke exhaust pipe 2 connected to the top of the spray tower 1, an activated carbon box 3 connected to the smoke exhaust pipe 2, and a chimney 5 connected to the activated carbon box 3. The connection between the chimney 5 and the activated carbon box 3 is connected to a centrifugal fan 4, the liquid storage tank 6 is connected to a connecting pipe 7, the connecting pipe 7 passes through the spray tower 1 and is connected to a plurality of atomizing nozzles, the connecting pipe 7 is connected to a spray pump 8, and the liquid storage tank 6 is filled with a spray liquid. The spray liquid is selected from a pH regulator, an oxidant, etc., to achieve effective removal of organic pollutants and acid gases in the dried exhaust gas.

[0022] like Figure 2As shown, an annular baffle 10 located above the smoke inlet pipe 9 is provided in the spray tower 1, and the annular baffle 10 includes an annular disk portion fixedly connected to the inner circle of the spray tower 1, and a circular tube portion fixedly connected to the annular disk portion. The horizontal height of the top surface of the annular disk portion gradually decreases from the center of the circle to the outside, and the cross-section of the circular tube portion gradually increases from top to bottom. The top surface of the annular disk portion and the inner and outer circles of the circular tube portion are all arc surfaces. A filter convex mesh 11 is fixedly connected to the upper end of the circular tube portion to block its opening. The outer diameter of the filter convex mesh 11 gradually increases from top to bottom, and a plurality of filter holes are opened on its outer peripheral wall. The apertures of the plurality of filter holes are gradually increased from top to bottom along the height direction of the filter convex mesh 11. The aperture of the filter convex mesh 11 is 5-15mm, which is used to block solid particles that agglomerate after contacting the spray and will not hinder the flow of flue gas.

[0023] The outer peripheral wall of the spray tower 1 is fixedly connected with a circulation component connected with it, and the horizontal height of the atomizing nozzle is greater than the horizontal height of the circulation component. The lowest horizontal height of the feed port of the circulation component is the same as the lowest horizontal height of the top surface of the circular disk portion. The discharge port of the circulation component is located between the circular tube portion and the inner peripheral wall of the spray tower 1. The circulation component includes a recovery pipe 12 connected with the spray tower 1, a reduction pipe 13 connected with the recovery pipe 12, a return pipe 14 connected with the reduction pipe 13 and extending into the spray tower 1, and a water outlet pipe 15 connected with the return pipe 14 and between the inner wall of the spray tower 1 and the circular tube portion. A circulation pump can be connected to the return pipe 14. A ring-shaped filter screen 16 is fixedly connected in the return pipe 14, and the horizontal height of the filter screen 16 is gradually reduced from the center of the circle to the outside.

[0024] The circulation component also includes an inlet and outlet pipe 17 that passes through the outer peripheral wall of the shrinking pipe 13 and is connected to it, an inlet pipe 19 and an outlet pipe 18 that are connected to one end of the inlet and outlet pipe 17 away from the shrinking pipe 13, the inlet and outlet pipe 17 is located below the shrinking pipe 13, and both the inlet pipe 19 and the outlet pipe 18 can be connected to an electromagnetic valve, the inlet pipe 19 is used to connect to an external water source, and the outlet pipe 18 is used for discharge.

[0025] When the utility model is working, the smoke enters the spray tower 1 through the smoke inlet pipe 9 and is located below the annular baffle 10. With the subsequent blowing of smoke, the smoke will leave through the circular tube and the filter convex mesh 11 and enter the spray tower 1. Thereafter, the spray pump 8 will suck the spray liquid into the atomizing nozzle through the connecting pipe 7. The atomizing nozzle sprays the atomized spray liquid to contact the smoke. The acidic gas, water-soluble VOCs and water mist in the smoke will be effectively removed, and the solid particles will also be clustered together to form larger solid particles that fall from the smoke.

[0026] At this time, the filter convex mesh 11 blocks the upper opening of the circular tube to prevent large-volume solid particles from falling to the bottom of the spray tower 1. At the same time, due to the shape setting and filter hole setting of the filter convex mesh 11, when solid particles fall on it, they will be guided to slide onto the annular baffle 10 and then fall into the water.

[0027] During this process, the circulation pump will suck water from the return pipe 14, the necking pipe 13, and the recovery pipe 12, and the water will flow with the solid particles, so that the solid particles on the annular baffle 10 can be retained in the inlet and outlet pipes 17 and the recovery pipe 12 driven by the water flow. When the water flow carries some particles to flow in the return pipe 14, it can be blocked by the filter screen 16, and the shape of the filter screen 16 is set so that when the water flow hits it, the filter screen 16 will not contact it in the form of a vertical surface, thereby reducing the force borne by the filter screen 16 when it contacts the water flow, ensuring that its structure is stable and firm when installed.

[0028] The water leaving the reflux pipe 14 will enter the water outlet pipe 15. The outlet pipe 15 is arranged opposite to the top surface of the annular baffle 10. The water sprayed out will carry a certain mechanical potential energy, thereby impacting the solid particles attached to the annular baffle 10, so that the solid particles are retained in the recovery pipe 12 and the inlet and outlet pipes 17 as much as possible.

[0029] When the water is turbid or contains a lot of solid particles, the solenoid valve of the outlet pipe 18 can be opened to allow the water to leave with the solid particles, and then the solenoid valve can be closed again, the solenoid valve on the inlet pipe 19 can be opened, and new water can be pumped in to complete the cleaning of the circulation component and the spray tower 1. After the cleaning is completed, some water is retained and the above work is repeated.

[0030] After leaving the spray tower 1 , the treated flue gas will enter the activated carbon box 3 through the exhaust pipe 2 for further treatment, and then enter the chimney 5 under the guidance of the centrifugal fan 4 for discharge.

[0031] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A high-efficiency pretreatment system for printing and dyeing sludge drying waste gas, It is characterized in that The invention comprises a spray tower (1), a smoke inlet pipe (9) fixedly connected to the outer peripheral wall and arranged in communication therewith, an annular shield (10) located above the smoke inlet pipe (9) being arranged in the spray tower (1), the annular shield (10) comprising a circular disk portion fixedly connected to the inner circle of the spray tower (1), and a circular tube portion fixedly connected to the circular disk portion, the horizontal height of the top surface of the circular disk portion gradually decreases from the center of the circle outward, and the cross-section of the circular tube portion gradually increases from top to bottom, the outer peripheral wall of the spray tower (1) is fixedly connected to a circulation component in communication therewith, the lowest horizontal height of the feed port of the circulation component is the same as the lowest horizontal height of the top surface of the circular disk portion, and the discharge port of the circulation component is located between the circular tube portion and the inner peripheral wall of the spray tower (1).

2. According to claim 1, a high-efficiency pretreatment system for waste gas from drying printing and dyeing sludge, It is characterized in that The upper end of the circular tube portion is fixedly connected with a filter convex screen (11) that blocks its opening, the outer diameter of the filter convex screen (11) gradually increases from top to bottom, and a plurality of filter holes are provided on its outer peripheral wall, the apertures of the plurality of filter holes are gradually increased from top to bottom along the height direction of the filter convex screen (11).

3. According to claim 1, a high-efficiency pretreatment system for waste gas from drying printing and dyeing sludge, It is characterized in that The circulation component comprises a recovery pipe (12) connected to the spray tower (1), a constricted pipe (13) connected to the recovery pipe (12), a return pipe (14) connected to the constricted pipe (13) and extending into the spray tower (1), and a water outlet pipe (15) connected to the return pipe (14) and between the inner wall of the spray tower (1) and the circular pipe portion. The return pipe (14) may be connected to a circulation pump.

4. A high-efficiency pretreatment system for waste gas from drying printing and dyeing sludge according to claim 3, It is characterized in that A ring-shaped filter screen (16) is fixedly connected inside the return pipe (14), and the horizontal height of the filter screen (16) is gradually reduced from the center of the circle toward the outside.

5. A high-efficiency pretreatment system for waste gas from drying printing and dyeing sludge according to claim 4, It is characterized in that The circulation component further comprises an inlet and outlet pipe (17) penetrating the outer peripheral wall of the shrinking pipe (13) and being arranged in communication therewith, and an inlet pipe (19) and an outlet pipe (18) being in communication with one end of the inlet and outlet pipe (17) away from the shrinking pipe (13); the inlet and outlet pipe (17) is located below the shrinking pipe (13), and both the inlet pipe (19) and the outlet pipe (18) can be connected to a solenoid valve; the inlet pipe (19) is used to connect to an external water source, and the outlet pipe (18) is used for discharge.

6. A high-efficiency pretreatment system for waste gas from drying printing and dyeing sludge according to claim 1, It is characterized in that It also includes a liquid storage tank (6), the liquid storage tank (6) is connected to a connecting pipe (7), the connecting pipe (7) penetrates into the spray tower (1) and is connected to a plurality of atomizing nozzles, and the horizontal height of the atomizing nozzles is greater than the horizontal height of the circulation component, and the connecting pipe (7) is connected to a spray pump (8).

7. The high-efficiency pretreatment system for waste gas from drying printing and dyeing sludge according to claim 1, It is characterized in that It also comprises a smoke exhaust pipe (2) connected to the top of the spray tower (1), an activated carbon box (3) connected to the smoke exhaust pipe (2), and a chimney (5) connected to the activated carbon box (3); a centrifugal fan (4) is connected to the chimney (5) and the activated carbon box (3).

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