Tail gas treatment device for printing and dyeing equipment

Abstract

The invention discloses a tail gas treatment device for printing and dyeing equipment, and relates to the field of printing and dyeing, and the tail gas treatment device is characterized by comprising a shell, the front end and the rear end of the shell are respectively provided with a gas inlet and a gas outlet, the shell internally comprises a filtering mechanism, the filtering mechanism comprises a plurality of breathable cylinders, the inner walls of the breathable cylinders are provided with adsorption materials, and the bottoms of the breathable cylinders are provided with one-way valves. Through the filtering mechanism, the filtering mechanism is composed of the rotary screen printing roller and the additional adsorption material, the one-way valve is arranged at the bottom end, and water and oil are automatically discharged into the collecting mechanism at the bottom under the condition that the mass of the water and oil in the breathable cylinder is larger than set force. And the filtered tail gas is released from a chimney after being heated and subjected to white removal. Oil, water, particulate matter and the like in waste gas are greatly reduced, meanwhile, a printing roller for rotary screen printing is reused, the environment-friendly effect is achieved, a watertight structure in the prior art is not needed in the process, and more water resources are saved.

Description

Technical Field

[0001] The invention relates to the field of printing and dyeing, and more specifically, to an exhaust gas treatment device for printing and dyeing equipment. Background Art

[0002] In the textile printing and dyeing industry, textile printing and dyeing equipment such as setting machines will generate a large amount of high-temperature exhaust gas containing oil mist, water vapor and particulate matter during the production process. Traditional exhaust gas treatment systems generally use spray cooling combined with electrostatic adsorption, which has the problems of low treatment efficiency and easy secondary pollution.

[0003] A filter box of a waste gas treatment device for a textile stenting machine disclosed in a Chinese patent with publication number CN113713550A has the following technical points: a box body with a rectangular structure, the box body is divided into an upper cavity and a lower cavity by a horizontal partition, the side wall of the lower cavity is connected to an air intake duct, the top of the upper cavity is provided with an exhaust duct, the rear end of the exhaust duct is connected to a negative pressure fan, water is placed at the bottom of the lower cavity, and a watertight structure is realized; a plurality of vertically arranged filter devices are arranged in the lower cavity, the filter device is a hollow structure, and has a multi-layer filter layer structure, the top of the hollow structure of the filter device penetrates the upper cavity, and an air path from the lower cavity to the hollow structure of the filter device to the upper cavity is realized through the watertight structure.

[0004] The above solution solves the problem that the electrostatic adsorption treatment efficiency is low, and the collection rate is generally only below 90%, which can no longer meet the current environmental protection requirements. The traditional filtering dust removal method still has the problems of bulky structure, inconvenient maintenance and low filtering efficiency. However, its filtering method requires a watertight structure and requires more water, which is a waste of water resources.

[0005] Therefore, a new solution needs to be proposed to solve this problem. Summary of the invention

[0006] In view of the shortcomings of the prior art, the present invention aims to provide an exhaust gas treatment device for printing and dyeing equipment.

[0007] The above technical purpose of the present invention is achieved through the following technical solutions: a printing and dyeing equipment exhaust gas treatment device, including a shell, the front and rear ends of the shell are respectively provided with an air inlet and an air outlet, the shell includes a filtering mechanism, the filtering mechanism includes a plurality of air-permeable cylinders, the inner wall of the air-permeable cylinder is provided with adsorption material, the bottom of the air-permeable cylinder is provided with a one-way valve, the air-permeable cylinder realizes gas entering the air-permeable cylinder from the side through the air pressure difference and filters out the oil in the exhaust gas through the adsorption material, the shell is provided with a collecting structure located below the filtering mechanism, and the one-way valve automatically discharges the oil into the collecting structure at the bottom when the oil mass is greater than the set force.

[0008] The present invention is further configured as follows: a high-pressure negative pressure fan is provided at the rear of the shell, the filtering mechanism includes a partition, the partition divides the interior of the shell into an exhaust gas treatment chamber and a negative pressure chamber, the negative pressure chamber forms a negative pressure through the high-pressure negative pressure fan, the top of the breathable cylinder is fixedly connected to the partition and its top end passes through the partition to connect to the negative pressure chamber.

[0009] The present invention is further configured such that: the air-permeable cylinder adopts a round screen printing roller.

[0010] The present invention is further configured as follows: the one-way valve is a sealing plate rotatably connected to the bottom of the breathable cylinder, one end of the sealing plate is provided with a counterweight block located outside the breathable cylinder, and under the gravity of the counterweight block, the sealing plate seals the bottom of the breathable cylinder.

[0011] The present invention is further configured as follows: a cooling exchanger is provided in the shell, and the exhaust gas entering the air inlet is first cooled by the cooling exchanger.

[0012] The present invention is further configured as follows: a spray mechanism for reducing the temperature of the exhaust gas is provided in the shell, and the exhaust gas cooled by the cooling exchanger is further cooled by the spray mechanism.

[0013] The present invention is further configured as follows: a cooling heat exchanger and a heating heat exchanger are also provided in the shell, and the exhaust gas cooled by the spray mechanism passes through the cooling heat exchanger and the heating heat exchanger in sequence, and the heating heat exchanger is located before the filtering mechanism. The cooling heat exchanger is used to condense the oil and water in the exhaust gas into liquid and separate them, and the heating heat exchanger is used to heat the liquid water in the exhaust gas into gas.

[0014] The present invention is further configured as follows: a de-whitening system is provided on the top of the shell.

[0015] The present invention is further configured as follows: a gap connecting the exhaust gas treatment chamber and the negative pressure chamber is provided at a position of the partition near the inner bottom surface of the shell, the collection structure includes an inner tank body arranged in the exhaust gas treatment chamber and an outer tank body arranged in the negative pressure chamber, the inner tank body and the outer tank body are connected through the gap, and the oil in the exhaust gas fills the gap to form an oil seal structure.

[0016] In summary, the present invention has the following beneficial effects: The technology and structure of the present invention first reduce the temperature of the exhaust gas through the spray mechanism in the front end, and then greatly reduce the temperature through the cooling heat exchanger, condense the oil and water in the exhaust gas into liquid and separate them, and then heat them again with the heating heat exchanger, and pass through the filtering mechanism. The filtering mechanism is composed of a round screen printing roller and additional adsorption materials, and a one-way valve is provided at the bottom. When the mass of water and oil in the breathable cylinder is greater than the set force, it is automatically discharged to the collection mechanism at the bottom. The filtered exhaust gas is heated and de-bleached again and then released from the chimney. The oil, water, particulate matter, etc. in the exhaust gas are greatly reduced, and the printing roller of the round screen printing is reused, which plays an environmental protection role. The watertight structure of the prior art is not required in the process, which saves more water resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the present invention excluding the tank body Figure 1 ; Figure 2 for Figure 1 The enlarged schematic diagram of the middle A part; Figure 3 for Figure 1 The enlarged schematic diagram of the middle part B; Figure 4 The structure of the present invention is schematically shown Figure 2 .

[0018] Figure 5 It is a schematic diagram of the structure of the breathable cylinder and the adsorption material in the present invention; Figure 6 The schematic diagram of the structure of the air-permeable cylinder and the sealing plate in the present invention is In the figure: 1. Shell; 2. Air inlet; 3. Air outlet; 4. Breathable cylinder; 5. Adsorption material; 6. One-way valve; 7. High-pressure negative pressure fan; 8. Partition; 9. Sealing plate; 10. Counterweight; 11. Cooling exchanger; 12. Spraying mechanism; 13. Cooling heat exchanger; 14. Heating heat exchanger; 15. De-whitening system; 16. Exhaust gas treatment chamber; 17. Negative pressure chamber; 18. Inner tank body; 19. Outer tank body; 20. Guide plate; 21. Gap. DETAILED DESCRIPTION

[0019] The present invention is described in detail below in conjunction with the accompanying drawings and embodiments. Example

[0020] A printing and dyeing equipment tail gas treatment device, such as Figure 1 and Figure 4As shown, it includes a shell 1, and the front and rear ends of the shell 1 are respectively provided with an air inlet 2 and an air outlet 3. The air inlet 2 and the air outlet 3 are air ducts, and flanges for connection are provided on them. The exhaust gas treatment device of the printing and dyeing equipment can be connected to the exhaust gas exhaust pipe of the corresponding printing and dyeing equipment. There is no restriction on the shape of the shell 1, as long as the exhaust gas can flow in the shell 1. This embodiment adopts a rectangular shell 1.

[0021] like Figure 1 and Figure 4 As shown, a cooling exchanger 11 is installed near the air inlet 2 in the shell 1. The exhaust gas entering the air inlet 2 is first cooled by the cooling exchanger 11 to reduce the temperature of the exhaust gas. The cooling exchanger 11 adopts a composite plate heat pipe heat exchanger, and its plate group design: titanium alloy stamping corrugated plate (thickness 0.8mm, corrugation depth 5mm) is used to form 50 groups of independent flow channels. Each corrugated plate is embedded with a micro heat pipe array (diameter 3mm, working fluid is Na-K alloy), the working temperature range is 80-300℃, the condensing end of the heat pipe is connected to the external waste heat boiler to recover heat for plant steam supply, and the plate surface is laser clad with Al 2 O 3 -TiO 2 The coating (thickness 50μm) has a contact angle of >150°, achieving super oleophobic properties. The flow channel inlet is sprayed with Fe-Cr-W wear-resistant alloy (hardness HRC60) to resist particle erosion. The outlet temperature of the cooling exchanger 11 is controlled at 80±5°C, which reduces the subsequent spray water consumption by 40%. Through the above design, the cooling exchanger 11 of the present invention not only meets the demand for efficient cooling, but also becomes the energy hub of the entire exhaust gas treatment system, achieving a double breakthrough in environmental protection performance and economic benefits.

[0022] like Figure 1 and Figure 4 As shown, a spray mechanism 12 for reducing the exhaust temperature is provided in the housing 1. The exhaust cooled by the cooling exchanger 11 is further cooled by the spray mechanism 12. The spray mechanism 12 is a cyclone atomizing counter-flow sprayer. Specifically, the structural features of the cyclone atomizing counter-flow sprayer include: Atomization system: High-pressure swirl nozzles (aperture 0.5mm, pressure 2.5MPa) are used to produce 10-50μm droplets (Sauter average diameter D32=25μm). The nozzles are arranged in a hexagonal array (spacing 150mm), with a coverage rate of 98%; Gas-liquid flow field optimization: the exhaust gas enters the tower body tangentially (flow rate 15m / s), forming a spiral updraft droplet that passes through a two-way counter-flow nozzle (inclination 60°) to achieve gas-liquid countercurrent-cocurrent composite contact, and the mass transfer coefficient is increased by 40%; Self-cleaning mechanism: piezoelectric ceramics (frequency 1MHz) are embedded inside the nozzle, and pulsed ultrasonic vibration prevents oil and dirt from adhering.

[0023] And if Figure 1 and Figure 4 As shown, a guide plate 20 is provided in the shell 1 between the cooling exchanger 11 and the spray mechanism 12. The guide plate 20 is arranged in an arc shape. Through thermodynamic simulation optimization and fluid simulation of the guide plate 20, the spray water mist particle size matches the heat exchanger flow field, thereby achieving the purpose of energy saving, environmental protection and efficient cooling.

[0024] like Figure 1 and Figure 4 As shown, a cooling heat exchanger 13 and a heating heat exchanger 14 are also provided in the shell 1. The cooling heat exchanger 13 and the heating heat exchanger 14 also adopt common heat exchangers on the market, so they are not repeated here. The difference from other heat exchangers is that the cooling heat exchanger 13 and the heating heat exchanger 14 of this embodiment are surface treated, and the surface is provided with a super oleophobic coating: fluorosilane modified zinc oxide nanowires (contact angle>165°, rolling angle<5°) and the surface is wear-resistant treated: plasma sprayed Cr3C2-NiCr coating (thickness 50μm, porosity<1%). The exhaust gas cooled by the spraying mechanism 12 passes through the cooling heat exchanger 13 and the heating heat exchanger 14 in turn. The heating heat exchanger 14 is located before the filtering mechanism. The cooling heat exchanger 13 is used to condense the oil and water in the exhaust gas into liquid and separate them, and the heating heat exchanger 14 is used to heat the liquid water in the exhaust gas into gas, so as to facilitate the subsequent treatment of the exhaust gas.

[0025] like Figure 4 , Figure 5 and Figure 6As shown, the housing 1 includes a filter mechanism, which includes several air-permeable cylinders 4, and the inner wall of the air-permeable cylinder 4 is provided with an adsorption material 5. Specifically, the adsorption material 5 uses multi-layer filter cotton, and a one-way valve 6 is provided at the bottom of the air-permeable cylinder 4. The air-permeable cylinder 4 uses a pressure difference to allow gas to enter the air-permeable cylinder 4 from the side and filter out the oil in the tail gas through the adsorption material 5. The housing 1 is provided with a collection structure located below the filter mechanism. When the oil mass is greater than the set force, the one-way valve 6 automatically discharges it to the collection structure at the bottom. The air-permeable cylinder 4 uses a round screen printing roller, which can be a round screen printing roller discarded by a printing and dyeing enterprise. The filter mechanism is composed of a round screen printing roller and additional adsorption material 5, and a one-way valve 6 is provided at the bottom. When the water and oil mass in the air-permeable cylinder 4 is greater than the set force, it is automatically discharged to the collection mechanism at the bottom. The filtered tail gas is heated and de-whitened again and released from the chimney. The oil, water, and particulate matter in the exhaust gas are greatly reduced. At the same time, the rotary screen printing roller is reused, which plays an environmental protection role. The process does not require the watertight structure of the existing technology, which saves more water resources. The procurement cost of discarded rotary screen printing rollers is only 20% of that of new filter cylinders, and a single rotary screen printing roller can be reused 3-5 times (regenerated by ultrasonic cleaning). The equipment material cost is reduced by 70%, and each reuse of one roller reduces the steel consumption by 80kg, CO 2 The emission is reduced by 200kg. The laser engraved mesh (50-100μm) of the rotary screen printing roller presents a gradient arrangement of "sparse inlet and dense outlet" (density difference 30%), which guides the oil mist particles to form a vortex in the breathable cylinder 4, and the collision probability is improved, which has a better filtering effect. The lateral air intake mode of the breathable cylinder 4 prevents particles from directly impacting the adsorption material 5, and can make the uncaptured coarse particles automatically slide to the collection tank under the action of their own weight, thereby extending the life of the filter material.

[0026] like Figure 1 and Figure 4 As shown, a high-pressure negative pressure fan 7 is installed on the outer side of the rear end of the shell 1, and the filtering mechanism includes a partition 8. The partition 8 divides the interior of the shell 1 into an exhaust gas treatment chamber 16 and a negative pressure chamber 17. The negative pressure chamber 17 forms a negative pressure through the high-pressure negative pressure fan 7. The top of the air-permeable cylinder 4 is fixedly connected to the partition 8 and its top end passes through the partition 8 to connect to the negative pressure chamber 17. The exhaust gas treatment chamber 16 (normal pressure) and the negative pressure chamber 17 (-800Pa) separated by the partition 8 form a stable pressure difference gradient, driving the exhaust gas to evenly penetrate all the air-permeable cylinders 4 at a flow rate of 1.2m / s, eliminating the "airflow short circuit" phenomenon of the traditional single-chamber system (bypass rate <0.5%). The negative pressure chamber 17 has a built-in pressure difference sensor (accuracy ±5Pa) to adjust the speed of the high-pressure negative pressure fan 7 in real time to ensure that the treatment efficiency is stable within ±2% under the fluctuation of the filtration resistance (±50Pa).

[0027] like Figure 5As shown, the one-way valve 6 is a sealing plate 9 rotatably connected to the bottom of the breathable cylinder 4. One end of the sealing plate 9 is provided with a counterweight block 10 located on the outside of the breathable cylinder 4. Under the gravity of the counterweight block 10, the sealing plate 9 closes the bottom of the breathable cylinder 4. When there is more oil on the sealing plate 9, the sealing plate 9 will rotate, thereby pouring out the excess oil and immediately reaching a balance, thereby achieving a sealing effect. The oil can also block the gap 21 between the sealing plate 9 and the inner wall of the breathable cylinder 4, thereby achieving the sealing effect of the oil seal.

[0028] like Figure 1 , Figure 2 and Figure 3 As shown, a gap 21 connecting the exhaust gas treatment chamber 16 and the negative pressure chamber 17 is provided at a position of the partition 8 near the inner bottom surface of the shell 1, and the collecting structure includes an inner tank body 18 arranged in the exhaust gas treatment chamber 16 and an outer tank body 19 arranged in the negative pressure chamber 17, the inner tank body 18 and the outer tank body 19 are connected through the gap 21, the width of the outer tank body 19 is smaller than the inner tank body 18, the oil in the exhaust gas fills the gap 21 to form an oil seal structure, the collected oil falls into the inner tank body 18, and flows into the outer tank body 19 through the gap 21. When the equipment is normally used, since the outer tank body 19 is in the negative pressure chamber 17, its liquid level is relatively high, which can facilitate the collection and treatment of the filtered material without damaging the oil seal structure between the inner tank body 18 and the outer tank body 19.

[0029] like Figure 1 and Figure 4 As shown, the top of the shell 1 is provided with a de-whitening system 15, which integrates a chimney, a condensation reheating module and an activated alumina adsorption layer, and reduces the flue gas temperature by condensing water vapor in the flue gas, and then heats the flue gas to a suitable temperature through a heating device, thereby reducing the generation of white smoke. This method can effectively reduce the water vapor content in the flue gas, improve the transparency of the flue gas, reduce the water content of the tail gas from 30g / m³ to 1.5g / m³, and the VOCs emission concentration is <10mg / m³ (stricter than the national standard GB 16297). The inner wall of the chimney is coated with a nano-ceramic coating (hardness HV1500), and the corrosion resistance life exceeds 10 years in an acidic condensate water (pH 4-5) environment, and the maintenance cost is reduced by 90%.

[0030] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A device for treating tail gas of a printing and dyeing equipment, comprising a housing (1), wherein the front and rear ends of the housing (1) are respectively provided with an air inlet (2) and an air outlet (3), and the housing (1) includes a filtering mechanism, characterized in that: The filtering mechanism comprises a plurality of air-permeable cylinders (4), the inner wall of the air-permeable cylinders (4) is provided with an adsorption material (5), the bottom of the air-permeable cylinders (4) is provided with a one-way valve (6), the air-permeable cylinders (4) enable gas to enter the air-permeable cylinders (4) from the side through a pressure difference and filter out oil in the tail gas through the adsorption material (5), the housing (1) is provided with a collection structure located below the filtering mechanism, and the one-way valve (6) automatically discharges the oil into the collection structure at the bottom when the oil mass is greater than a set force.

2. The tail gas treatment device for printing and dyeing equipment according to claim 1, characterized in that: A high-pressure negative pressure fan (7) is provided at the rear of the shell (1), and the filtering mechanism comprises a partition (8), wherein the partition (8) divides the interior of the shell (1) into an exhaust gas treatment chamber (16) and a negative pressure chamber (17), wherein the negative pressure chamber (17) forms a negative pressure through the high-pressure negative pressure fan (7), and the top of the air-permeable cylinder (4) is fixedly connected to the partition (8) and the top end thereof passes through the partition (8) to connect to the negative pressure chamber (17).

3. The tail gas treatment device for printing and dyeing equipment according to claim 1, characterized in that: The air-permeable cylinder (4) adopts a rotary screen printing roller.

4. The tail gas treatment device for printing and dyeing equipment according to claim 1, characterized in that: The one-way valve (6) is a sealing plate (9) rotatably connected to the bottom of the breathable cylinder (4). One end of the sealing plate (9) is provided with a counterweight block (10) located outside the breathable cylinder (4). Under the action of the gravity of the counterweight block (10), the sealing plate (9) closes the bottom of the breathable cylinder (4).

5. The tail gas treatment device for printing and dyeing equipment according to claim 1, characterized in that: A cooling exchanger (11) is provided in the housing (1), and the exhaust gas entering through the air inlet (2) is first cooled by the cooling exchanger (11).

6. The tail gas treatment device for printing and dyeing equipment according to claim 5, characterized in that: A spray mechanism (12) for reducing the temperature of the exhaust gas is provided in the shell (1), and the exhaust gas cooled by the cooling exchanger (11) is further cooled by the spray mechanism (12).

7. The tail gas treatment device for printing and dyeing equipment according to claim 6, characterized in that: A cooling heat exchanger (13) and a heating heat exchanger (14) are also provided in the shell (1). The exhaust gas cooled by the spray mechanism (12) passes through the cooling heat exchanger (13) and the heating heat exchanger (14) in sequence. The heating heat exchanger (14) is located before the filtering mechanism. The cooling heat exchanger (13) is used to condense the oil and water in the exhaust gas into liquid and separate them. The heating heat exchanger (14) is used to heat the liquid water in the exhaust gas into gas.

8. The tail gas treatment device for printing and dyeing equipment according to claim 1, characterized in that: A de-bleaching system (15) is provided on the top of the housing (1).

9. The tail gas treatment device for printing and dyeing equipment according to claim 1, characterized in that: The partition plate (8) is provided with a gap (21) connecting the exhaust gas treatment chamber (16) and the negative pressure chamber (17) at a position close to the inner bottom surface of the shell (1); the collection structure comprises an inner tank body (18) arranged in the exhaust gas treatment chamber (16) and an outer tank body (19) arranged in the negative pressure chamber (17); the inner tank body (18) and the outer tank body (19) are connected via the gap (21); the oil in the exhaust gas fills the gap (21) to form an oil seal structure.

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