Energy-saving ink printing machine tail gas recycling system and method

Abstract

The invention discloses an energy-saving tail gas recycling system of an ink printing machine. The energy-saving tail gas recycling system has the advantages of being high in recycling rate, more energy-saving and more environment-friendly. In addition, the invention further discloses a method of the system. The system comprises a heat exchanger, a first condensing and filtering device and a second condensing and filtering device, the first chamber comprises a first low-temperature condensing area and a first high-temperature filtering area, the first condensing and filtering device comprises a first filter element, and at least one part of structure of the first filter element can be switched back and forth between the first low-temperature condensing area and the first high-temperature filtering area. The second condensation and filtration removal equipment comprises a second low-temperature condensation area and a second high-temperature filtration removal area, the second condensation and filtration removal equipment comprises a second filter element, at least one part of the second filter element can be switched back and forth between the second low-temperature condensation area and the second high-temperature filtration removal area, and the tail gas exhaust pipe is communicated with the first low-temperature condensation area. The second low-temperature condensation area is communicated with the first condensation area, and the first high-temperature removal and filtration area, the second high-temperature removal and filtration area and the second low-temperature condensation area are respectively connected with the heat exchanger.

Description

Technical Field

[0001] The invention relates to the field of printing, and in particular to an energy-saving system and method for recycling tail gas from a water-based ink printer. Background Art

[0002] Traditional gravure printing usually uses solvent-based inks, but solvent-based inks require the addition of a certain amount of VOCs to dilute the ink during use. During the printing process, these VOCs will be emitted into the atmosphere. Therefore, water-based inks are generally used to replace traditional solvent-based inks.

[0003] Since water dries very slowly, water-based inks that use 100% water cannot meet the ink drying conditions in high-speed printing. Generally, 20% to 40% alcohol is added to the ink formula, and a diluent, that is, a mixture of water and alcohol, needs to be added during the printing process. Therefore, the addition of alcohol is used to adjust the drying speed of water-based inks during the printing process and is an indispensable additive. However, alcohol is one of the VOCs that must be treated according to national regulations. It cannot be discharged directly and needs to be recycled. Currently known recycling systems can recycle diluents, but the recovery rate is not high, and the water content is large. It needs to be distilled before it can be put into use. In addition, the final treated exhaust gas is directly discharged, which consumes a lot of energy and is not energy-saving and environmentally friendly.

[0004] Therefore, there is an urgent need to provide an energy-saving system and method for recycling exhaust gas from a water-based inkjet printer to overcome the above-mentioned defects. Summary of the invention

[0005] The purpose of the present invention is to provide an energy-saving system for recovering and reusing tail gas from a water-based ink printing machine.

[0006] Another object of the present invention is to provide an energy-saving method for recovering and reusing tail gas from a water-based ink printing machine.

[0007] To achieve the above-mentioned purpose, the energy-saving water-based ink printing machine exhaust gas recovery and reuse system provided by the present invention is suitable for being connected to the exhaust gas emission pipe of the water-based ink printing machine, and comprises a heat exchanger, a first condensation and defiltration device having a first chamber, and a second condensation and defiltration device having a second chamber, wherein the first chamber is composed of an independently separated first low-temperature condensation zone and a first high-temperature defiltration zone, the first condensation and defiltration device comprises a first filter element, at least a part of the structure of the first filter element can be switched back and forth between the first low-temperature condensation zone and the first high-temperature defiltration zone, and the second condensation and defiltration device is composed of an independently separated second low-temperature condensation zone. and the second high-temperature defiltration zone, the second condensation and defiltration equipment includes a second filter element, at least a part of the second filter element can be switched back and forth between the second low-temperature condensation zone and the second high-temperature defiltration zone, the exhaust gas emission pipe is connected with the first low-temperature condensation zone, the second low-temperature condensation zone is connected with the first condensation zone, the first high-temperature defiltration zone, the second high-temperature defiltration zone and the second low-temperature condensation zone are respectively connected to the heat exchanger, so that the primary mixed gas output from the first high-temperature defiltration zone, the secondary mixed gas output from the second high-temperature defiltration zone and the low-temperature exhaust gas output from the second low-temperature condensation zone are heat exchanged at the heat exchanger.

[0008] Preferably, the low-temperature tail gas output from the second low-temperature condensation zone flows through the heat exchanger and is then returned to the water-based ink printer through a return pipe to be used as a drying gas.

[0009] Preferably, the energy-saving water-based ink printing machine exhaust gas recovery and reuse system of the present invention also includes a centralized refrigerator, which is connected to a refrigeration pipeline for the flow of refrigerant, and a first condenser and a second condenser are installed on the refrigeration pipeline. The primary mixed gas output from the first high-temperature defiltration zone flows through the heat exchanger and is also connected to the first condenser for condensation. The first condenser is also connected to the first collector. The secondary mixed gas output from the second high-temperature defiltration zone flows through the heat exchanger and is also connected to the second condenser for condensation. The second condenser is also connected to the second collector.

[0010] Preferably, the refrigeration pipeline is a circulation pipeline, and the refrigeration pipeline also passes through the first low-temperature condensation area and the second low-temperature condensation area respectively. The parts of the refrigeration pipeline arranged in the first low-temperature condensation area and the second low-temperature condensation area are equipped with heat sinks.

[0011] Preferably, the first filter element is rotatably mounted in the first chamber, and the first filter element is rotated so that its parts are switched back and forth between the first low-temperature condensation zone and the first high-temperature defiltration zone.

[0012] Preferably, the first filter element is a wheel-type structure, half of the structure of the first filter element is in the first low-temperature condensation zone and the other half of the structure is in the first high-temperature defiltration zone.

[0013] Preferably, the second filter element is rotatably mounted in the second chamber, and the second filter element is rotated so that its parts are switched back and forth between the second low-temperature condensation zone and the second high-temperature defiltration zone.

[0014] Preferably, the second filter element is a wheel-type structure, half of the second filter element is located in the second low-temperature condensation zone and the other half is located in the first high-temperature defiltration zone.

[0015] Preferably, the temperature of the first low-temperature condensation zone is lower than the temperature of the second low-temperature condensation zone, the temperature of the first high-temperature defiltration zone is equal to the temperature of the second high-temperature defiltration zone, the first condensation and defiltration equipment also includes a first hot air duct connected to the first high-temperature defiltration zone, and the second condensation and defiltration equipment also includes a second hot air duct connected to the second high-temperature defiltration zone, and flowing hot air is provided in the first high-temperature defiltration zone and the second high-temperature defiltration zone.

[0016] To achieve another of the above-mentioned purposes, the present invention also provides an energy-saving method for recycling and reusing exhaust gas from a water-based ink printing machine, which comprises the following steps: the exhaust gas output from the exhaust emission pipe of the water-based ink printing machine is first input into a first low-temperature condensation zone of a first chamber of a first condensation and defiltration device, so that a certain part of the structure of a first filter element located in the first low-temperature condensation zone performs primary condensation and adsorption on the exhaust gas; by rotating the first filter element, a certain part of the structure of the first filter element that adsorbs the exhaust gas is placed in a first high-temperature defiltration zone for high-temperature defiltration to obtain a primary mixed gas; the exhaust gas is then input into a second low-temperature condensation zone of a second chamber of a second condensation and defiltration device, so that a certain part of the structure of the second filter element located in the second low-temperature condensation zone performs secondary condensation and adsorption on the exhaust gas; and by rotating The second filter element makes a part of the structure of the second filter element for adsorbing exhaust gas be in the second high-temperature defiltration zone for high-temperature defiltration to obtain a secondary mixed gas. The primary mixed gas, the secondary mixed gas and the low-temperature exhaust gas output from the second low-temperature condensation zone are heat exchanged in the heat exchanger. The low-temperature exhaust gas output from the second low-temperature condensation zone is returned to the ink printing press after passing through the heat exchanger. The primary mixed gas is connected to the first condenser after passing through the heat exchanger. The first condenser condenses the primary mixed gas into a primary filtrate. The first collector collects the primary filtrate. The secondary mixed gas is connected to the second condenser after passing through the heat exchanger. The second condenser condenses the secondary mixed gas into a secondary filtrate. The second collector collects the secondary filtrate.

[0017] Compared with the prior art, the energy-saving water-ink printing machine tail gas recovery and recycling system of the present invention can perform double condensation adsorption and heating evaporation defiltration on the tail gas, thereby improving the recovery rate of water and alcohol. Moreover, after secondary filtration, the ratio of water and alcohol can be optimized, and the proportion of alcohol in the obtained secondary filtrate is increased, and it can be put into use directly or after adding water to adjust the ratio without distillation. In addition, the temperature of the tail gas output from the second low-temperature condensation zone is relatively low, while the temperature of the primary mixed gas and the secondary mixed gas is relatively high. After the primary mixed gas, the secondary mixed gas and the tail gas output from the second low-temperature condensation zone are heat exchanged at the heat exchanger, the temperature of the primary mixed gas and the secondary mixed gas can be reduced, and the primary mixed gas can be liquefied into the primary filtrate with less energy, and the secondary mixed gas can be liquefied into the secondary filtrate with less energy, which is more energy-saving and environmentally friendly.

[0018] It is understandable that the energy-saving water-based ink printing machine exhaust gas recovery and reuse method of the present invention also has the advantages of high recovery rate, and the alcohol content in the obtained secondary filtrate is increased. It can be put into use directly or after adding water without distillation. Less energy is consumed during processing, which is more energy-saving and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the energy-saving water-based ink printing machine tail gas recovery and reuse system of the present invention.

[0020] Figure 2 It is a side structural schematic diagram of the first condensation and defiltration equipment of the present invention.

[0021] Figure 3 It is a side structural schematic diagram of the second condensation and defiltration equipment of the present invention. DETAILED DESCRIPTION

[0022] In order to explain the technical content and structural features of the present invention in detail, further description will be given below in combination with the implementation modes and the accompanying drawings.

[0023] The present invention discloses an energy-saving water-based ink printer exhaust gas recovery and reuse system, which is suitable for being connected to the exhaust gas emission pipe of the water-based ink printer, condensing and recovering the exhaust gas emitted by the water-based ink printer and performing high-temperature defiltration, thereby recovering water and alcohol in the exhaust gas and reusing it. Preferably, the present invention mainly increases the proportion of alcohol in the recovered liquid, improves the recovery rate and optimizes the composition ratio of the recovered liquid, and is more environmentally friendly and energy-saving.

[0024] like Figures 1 to 3As shown, the present invention provides an energy-saving water-based ink printing machine exhaust gas recovery and reuse system 100, including a first condensation and defiltration device 10 having a first chamber, a second condensation and defiltration device 20 having a second chamber, and a heat exchanger 30. The first chamber is composed of an independently separated first low-temperature condensation zone 11 and a first high-temperature defiltration zone 12. The first condensation and defiltration device 10 includes a first filter element 13, and at least a portion of the first filter element 13 can be switched back and forth between the first low-temperature condensation zone 11 and the first high-temperature defiltration zone 12. The second chamber is composed of an independently separated second low-temperature condensation zone 21 and a second high-temperature defiltration zone 22. The second condensation and defiltration device 20 includes a second filter element 23, and at least a portion of the structure of the second filter element 23 can be switched back and forth between the second low-temperature condensation zone 21 and the second high-temperature defiltration zone 22. The exhaust gas discharge pipe 01 is connected to the first low-temperature condensation zone 11, and the second low-temperature condensation zone 21 is connected to the first low-temperature condensation zone 11. The first high-temperature defiltration zone 12, the second high-temperature defiltration zone 22 and the second low-temperature condensation zone 21 are respectively connected to the heat exchanger 30, so that the primary mixed gas output from the first high-temperature defiltration zone 12, the secondary mixed gas output from the second high-temperature defiltration zone 22 and the low-temperature exhaust gas output from the second low-temperature condensation zone 21 are heat exchanged at the heat exchanger 30.

[0025] During operation, the exhaust gas output from the exhaust pipe 01 of the water-based inkjet printer is first input into the first low-temperature condensation zone 11. The temperature of the exhaust gas output from the exhaust pipe 01 is relatively high, while the temperature of the first low-temperature condensation zone 11 is relatively low. The components of the exhaust gas are mainly water and alcohol, which condense and are easily collected after being cooled. The first filter element 13 in a certain part of the first low-temperature condensation zone 11 performs primary condensation adsorption on the water and alcohol in the exhaust gas. The above-mentioned partial structure of the first filter element 13 (the part that performs primary condensation adsorption on the exhaust gas) is switched from the first low-temperature condensation zone 11 to the first high-temperature defiltration zone 12. Since the temperature of the first high-temperature defiltration zone 12 is relatively high, the adsorbed water and alcohol are heated and evaporated and defiltered to obtain a primary mixed gas. The tail gas is then input into the second low-temperature condensation zone 21. Since the freezing point of water is higher than that of alcohol in the first low-temperature condensation zone 11, a considerable portion of water is first condensed and adsorbed by the first filter element 13. The first filter element 13 has already adsorbed a considerable proportion of the water in the tail gas. Therefore, the ratio of water to alcohol in the tail gas flowing into the second low-temperature condensation zone 21 increases (i.e., the alcohol ratio increases), and the remaining water and alcohol in the tail gas are subjected to secondary condensation adsorption in a certain part of the second filter element 23. The above-mentioned partial structure of the second filter element 23 (the part for secondary condensation adsorption of the tail gas) is switched from the second low-temperature condensation zone 21 to the second high-temperature defiltration zone 22. Since the temperature of the second high-temperature defiltration zone 22 is relatively high, the adsorbed water and alcohol are heated and evaporated and defiltered, and the defiltered high-temperature gas is condensed into a secondary filtrate, and the secondary filtrate is collected. The primary mixed gas, the secondary mixed gas, and the low-temperature tail gas output from the second low-temperature condensation zone 21 are heat exchanged in the heat exchanger 30, which plays a role in cooling the primary mixed gas and the secondary mixed gas so as to better condense and liquefy them later. After the primary mixed body flows through the heat exchanger 30, it is condensed into a primary filtrate, which is collected. After the secondary mixed gas flows through the heat exchanger 30, it is condensed into a secondary filtrate, which is collected.

[0026] It can be seen that the energy-saving water-ink printing machine tail gas recovery and recycling system 100 of the present invention can perform double condensation adsorption and heating evaporation defiltration on the tail gas, thereby improving the recovery rate of water and alcohol. Moreover, after secondary filtration, the ratio of water and alcohol can be optimized, and the proportion of alcohol in the obtained secondary filtrate is increased, and it can be put into use directly or after adding water to adjust the ratio without distillation. In addition, the temperature of the tail gas output from the second low-temperature condensation zone 21 is relatively low, while the temperature of the primary mixed gas and the secondary mixed gas is relatively high. After the primary mixed gas, the secondary mixed gas and the tail gas output from the second low-temperature condensation zone 21 are heat exchanged at the heat exchanger 30, the temperature of the primary mixed gas and the secondary mixed gas can be reduced, and the primary mixed gas can be liquefied into the primary filtrate with less energy, and the secondary mixed gas can be liquefied into the secondary filtrate with less energy, which is more energy-saving and environmentally friendly.

[0027] The ratio of alcohol to water in the secondary filtrate is greater than that in the primary filtrate. It is found through actual experiments that the ratio of alcohol to water in the primary filtrate is approximately 10% alcohol and 90% water, and the ratio of alcohol to water in the secondary filtrate is approximately 50% alcohol and 50% water. It can be seen that the secondary filtrate does optimize the ratio of water to alcohol and can be put into use without distillation or adding a certain amount of water. It can be understood that by adding a certain amount of water to the secondary filtrate, the ratio of water to alcohol in the secondary filtrate can be adjusted, that is, the dilution effect can be achieved. For example, it can be adjusted to 30% alcohol and 70% water, and then it can be directly put into the water-based ink printer 200 for reuse.

[0028] Preferably, the temperature of the first low-temperature condensation zone 11 is lower than the temperature of the second low-temperature condensation zone 21, because the temperature of the exhaust gas flowing out of the first low-temperature condensation zone 11 has dropped (after cooling the first low-temperature condensation zone 11), so the temperature of the second low-temperature condensation zone 21 can be appropriately increased, and of course it can also be set to be the same as the first low-temperature condensation zone 11. The temperature of the first high-temperature defiltration zone 12 is equal to the temperature of the second high-temperature defiltration zone 22. Further, the temperature range of the first low-temperature condensation zone 11 is 10 to 50°C, preferably 30°C; the temperature range of the first high-temperature defiltration zone 12 is 140 to 160°C, preferably 150°C; the temperature range of the second low-temperature condensation zone 21 is 15 to 55°C, preferably 35°C; the temperature range of the second high-temperature defiltration zone 22 is 140 to 160°C, preferably 150°C, but not limited to the above values.

[0029] like Figure 1 As shown, the low-temperature exhaust gas output from the second low-temperature condensation zone 21 flows through the heat exchanger 30 and is then returned to the water-based ink printer 200 through the reflux pipe 31 to be used as a drying gas. The low-temperature gas output from the second low-temperature condensation zone 21 has been fully filtered out of water and alcohol, and thus becomes dry. Although the temperature of this part of the low-temperature gas is increased to a certain extent after passing through the heat exchanger 30, from about 35°C to 70°C, and becomes dry hot air, it can be used as a drying gas for the printed ink in the water-based ink printer 200, thereby improving the drying efficiency and making full use of the exhaust gas to avoid direct discharge, which is more energy-saving and environmentally friendly.

[0030] like Figure 1As shown, the energy-saving water-based ink printing machine exhaust gas recovery and reuse system 100 of the present invention also includes a centralized refrigerator 40. The centralized refrigerator 40 is connected to a refrigeration pipeline 41 for the flow of refrigerant, and a first condenser 42 and a second condenser 43 are installed on the refrigeration pipeline 41. The primary mixed gas output from the first high-temperature defiltration zone 12 flows through the heat exchanger 30 and is also connected to the first condenser 42 for condensation to obtain a primary filtrate. The first condenser 42 is also connected to the first collector 44, and the first collector 44 collects the primary filtrate. The secondary mixed gas output from the second high-temperature defiltration zone 22 flows through the heat exchanger 30 and is also connected to the second condenser 43 for condensation to obtain a secondary filtrate. The second condenser 43 is also connected to the second collector 45. The second condenser 43 is connected to the second collector 45, and the second collector 45 collects the secondary filtrate.

[0031] The refrigeration pipeline 41 provides refrigerant for the first condenser 42 and the second condenser 43. The temperature of the output primary mixed gas is approximately 150°C. After passing through the heat exchanger 30, the temperature drops to about 70°C, and the temperature of the refrigerant is approximately 2°C, so the first condenser 42 can effectively and quickly liquefy the primary mixed gas into a primary filtrate. The temperature of the output secondary mixed gas is approximately 150°C. After passing through the heat exchanger 30, the temperature drops to about 70°C, and the temperature of the refrigerant is approximately 2°C, so the second condenser 43 can effectively and quickly liquefy the secondary mixed gas into a secondary filtrate. Preferably, the above-mentioned refrigerant is ice water, but it can also be applied as cold air with a low temperature. Further, the refrigeration pipeline 41 is a circulation pipeline, and the refrigeration pipeline 41 also passes through the first low-temperature condensation zone 11 and the second low-temperature condensation zone 21 respectively. The refrigeration pipeline 41 is cyclic, with higher refrigeration efficiency and more energy-saving.

[0032] In addition, after the refrigeration pipeline 41 passes through the first low-temperature condensation zone 11, the first low-temperature condensation zone 11 is cooled and cooled down, so that the first low-temperature condensation zone 11 is maintained at 30° C. After the refrigeration pipeline 41 passes through the second low-temperature condensation zone 21, the second low-temperature condensation zone 21 is cooled and cooled down, so that the second low-temperature condensation zone 21 is maintained at 35° C. Preferably, the portion of the refrigeration pipeline 41 disposed in the first low-temperature condensation zone 11 and the second low-temperature condensation zone 21 is also equipped with a heat sink 03, and the heat sink 03 is used to enhance external heat dissipation, so as to better cool down the first low-temperature condensation zone 11 and the second low-temperature condensation zone 21.

[0033] It can be seen that the refrigerant output by the centralized refrigerator 40 not only liquefies the primary mixed gas and the secondary mixed gas through the refrigeration pipeline 41, but also cools the first low-temperature condensation area 11 and the second low-temperature condensation area 21, making full use of the refrigerant and improving environmental protection and energy saving effects.

[0034] like Figure 1 and Figure 2As shown, the first filter element 13 is rotatably installed in the first chamber. The rotating first filter element 13 enables its various parts to switch back and forth between the first low-temperature condensation zone 11 and the first high-temperature defiltration zone 12, so that condensation adsorption and high-temperature desorption can be performed continuously and quickly. Preferably, the first filter element 13 is a wheel structure, half of the structure of the first filter element 13 is in the first low-temperature condensation zone 11 and the other half of the structure is in the first high-temperature defiltration zone 12. The first filter element 13 after rotation enables its various parts to pass through the first low-temperature condensation zone 11 and the first high-temperature defiltration zone 12 evenly and continuously. Preferably, a first partition 14 (such as a partition, thermal insulation cotton, etc.) can be used in the first chamber to separate the first low-temperature condensation zone 11 and the first high-temperature defiltration zone 12 for effective physical separation and thermal insulation.

[0035] like Figure 1 and Figure 3 As shown, the second filter element 23 is rotatably installed in the second chamber, and the rotating second filter element 23 enables its various parts to switch back and forth between the second low-temperature condensation zone 21 and the second high-temperature defiltration zone 22, so that condensation adsorption and high-temperature defiltration can be performed continuously and quickly. Preferably, the second filter element 23 is a wheel structure, half of the structure of the second filter element 23 is in the second low-temperature condensation zone 21 and the other half of the structure is in the second high-temperature defiltration zone 22, so that the second filter element 23 after rotation enables its various parts to pass through the second low-temperature condensation zone 21 and the second high-temperature defiltration zone 22 evenly and continuously. Preferably, in the second chamber, a second partition 24 (partition, insulation cotton, etc.) can be used to separate the second low-temperature condensation zone 21 and the second high-temperature defiltration zone 22 for effective physical separation and insulation.

[0036] like Figure 2 and Figure 3 In order to improve the adsorption and filtration effect on water and alcohol, the first filter element 13 and the second filter element 23 are composed of a mesh-like adsorption structure, such as a sponge structure.

[0037] like Figure 1 As shown, in the embodiment provided by the present invention, flowing hot air is provided in the first high-temperature defiltration zone 12 and the second high-temperature defiltration zone 22. When the hot air flows through the first filter element 13 and the second filter element 23 respectively, the adsorbed water and alcohol can be quickly evaporated and heated to take away, thereby improving the defiltration rate, efficiency and effect. Of course, in other embodiments, heat pipes, heating wires and other structures can also be arranged in the first high-temperature defiltration zone 12 and the second high-temperature defiltration zone 22 to increase the temperature by thermal radiation, which can also achieve the function of high-temperature defiltration.

[0038] like Figure 1As shown, the first condensation defiltration device 10 also includes a first hot air pipe 15 connected to the first high-temperature defiltration zone 12. The second condensation defiltration device 20 also includes a second hot air pipe 25 connected to the second high-temperature defiltration zone 22. The first hot air pipe 15 is used to input flowing hot air into the first high-temperature defiltration zone 12, and the hot air is heated and evaporated to take away the water and alcohol adsorbed by the first filter element 13, thereby obtaining a high-temperature primary mixed gas. The second hot air pipe 25 is used to input flowing hot air into the second high-temperature defiltration zone 22, and the hot air is heated and evaporated to take away the water and alcohol adsorbed by the second filter element 23, thereby obtaining a high-temperature secondary mixed gas.

[0039] It is worth pointing out that since the treated exhaust gas is finally returned to the water-based ink printer 200 via the return pipe 31 and used as drying gas for the printed ink pattern, zero emission can be achieved.

[0040] like Figure 1 As shown, preferably, the first low-temperature condensation zone 11 and the second low-temperature condensation zone 21 are connected via a connecting pipe 02 , and the exhaust gas flowing out of the first low-temperature condensation zone 11 flows into the second low-temperature condensation zone 21 via the connecting pipe 02 .

[0041] The above disclosure is only a preferred embodiment of the present invention, which cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are all within the scope of the present invention.

Claims

1. An energy-saving water-based ink printer exhaust gas recovery and reuse system, suitable for connecting to the exhaust gas emission pipe of the water-based ink printer, characterized in that: It includes a heat exchanger, a first condensation and defiltration device with a first chamber, and a second condensation and defiltration device with a second chamber, the first chamber is composed of a first low-temperature condensation zone and a first high-temperature defiltration zone that are independently separated, the first condensation and defiltration device includes a first filter element, at least a part of the structure of the first filter element can be switched back and forth between the first low-temperature condensation zone and the first high-temperature defiltration zone, the second condensation and defiltration device is composed of a second low-temperature condensation zone and a second high-temperature defiltration zone that are independently separated, the second condensation and defiltration device includes a second filter element, at least a part of the second filter element can be switched back and forth between the second low-temperature condensation zone and the second high-temperature defiltration zone, the exhaust gas exhaust pipe is connected to the first low-temperature condensation zone, the second low-temperature condensation zone is connected to the first condensation zone, the first high-temperature defiltration zone, the second high-temperature defiltration zone and the second low-temperature condensation zone are respectively connected to the heat exchanger, so that the primary mixed gas output from the first high-temperature defiltration zone, the secondary mixed gas output from the second high-temperature defiltration zone and the low-temperature exhaust gas output from the second low-temperature condensation zone are heat exchanged at the heat exchanger.

2. The energy-saving water-based ink printing machine exhaust gas recovery and reuse system according to claim 1 is characterized in that: The low-temperature tail gas outputted from the second low-temperature condensation zone passes through the heat exchanger and is then returned to the water-based ink printer through a reflux pipe to be used as drying gas.

3. The energy-saving water-based ink printing machine exhaust gas recovery and reuse system according to claim 1 is characterized in that: It also includes a centralized refrigerator, which is connected to a refrigeration pipeline for the flow of refrigerant. A first condenser and a second condenser are installed on the refrigeration pipeline. The primary mixed gas output from the first high-temperature defiltration zone flows through the heat exchanger and is also connected to the first condenser for condensation. The first condenser is also connected to the first collector. The secondary mixed gas output from the second high-temperature defiltration zone flows through the heat exchanger and is also connected to the second condenser for condensation. The second condenser is also connected to the second collector.

4. The energy-saving water-based ink printing machine tail gas recovery and reuse system according to claim 3 is characterized in that: The refrigeration pipeline is a circulation pipeline, and the refrigeration pipeline also passes through the first low-temperature condensation area and the second low-temperature condensation area respectively. The parts of the refrigeration pipeline arranged in the first low-temperature condensation area and the second low-temperature condensation area are equipped with heat sinks.

5. The energy-saving water-based ink printing machine exhaust gas recovery and reuse system according to claim 1 is characterized in that: The first filter element is rotatably mounted in the first chamber, and the first filter element is rotated so that its parts switch back and forth between the first low-temperature condensation area and the first high-temperature defiltration area.

6. The energy-saving water-based ink printing machine tail gas recovery and reuse system according to claim 1 is characterized in that: The first filter element is a wheel-type structure, half of the structure of the first filter element is in the first low-temperature condensation zone and the other half of the structure is in the first high-temperature defiltration zone.

7. The energy-saving water-based ink printing machine tail gas recovery and reuse system according to claim 1 is characterized in that: The second filter element is rotatably mounted in the second chamber, and the second filter element is rotated so that its parts are switched back and forth between the second low-temperature condensation area and the second high-temperature defiltration area.

8. The energy-saving water-based ink printing machine tail gas recovery and reuse system according to claim 1 is characterized in that: The second filter element is a wheel-type structure, half of the second filter element is located in the second low-temperature condensation zone and the other half is located in the first high-temperature defiltration zone.

9. The energy-saving water-based ink printing machine tail gas recovery and reuse system according to claim 1 is characterized in that: The temperature of the first low-temperature condensation zone is lower than the temperature of the second low-temperature condensation zone, the temperature of the first high-temperature defiltration zone is equal to the temperature of the second high-temperature defiltration zone, the first condensation and defiltration equipment also includes a first hot air pipe connected to the first high-temperature defiltration zone, the second condensation and defiltration equipment also includes a second hot air pipe connected to the second high-temperature defiltration zone, and flowing hot air is provided in the first high-temperature defiltration zone and the second high-temperature defiltration zone.

10. An energy-saving method for recycling exhaust gas from a water-based ink printing machine, characterized in that: The following steps are involved: The exhaust gas output from the exhaust pipe of the water-based ink printer is first input into the first low-temperature condensation zone of the first chamber of the first condensation and defiltration device, so that a certain part of the structure of the first filter element in the first low-temperature condensation zone performs primary condensation and adsorption on the exhaust gas. By rotating the first filter element, a certain part of the structure of the first filter element that adsorbs the exhaust gas is placed in the first high-temperature defiltration zone for high-temperature defiltration to obtain a primary mixed gas. The exhaust gas is then input into the second low-temperature condensation zone of the second chamber of the second condensation and defiltration device, so that a certain part of the structure of the second filter element in the second low-temperature condensation zone performs secondary condensation and adsorption on the exhaust gas. By rotating the second filter element, a certain part of the second filter element that adsorbs the exhaust gas is placed in the first high-temperature defiltration zone for high-temperature defiltration to obtain a primary mixed gas. The structure is in the second high-temperature defiltration zone for high-temperature defiltration to obtain a secondary mixed gas. The primary mixed gas, the secondary mixed gas and the low-temperature exhaust gas output from the second low-temperature condensation zone are heat exchanged in a heat exchanger. The low-temperature exhaust gas output from the second low-temperature condensation zone is returned to the ink printing machine after passing through the heat exchanger. The primary mixed gas is connected to the first condenser after passing through the heat exchanger. The first condenser condenses the primary mixed gas into a primary filtrate. The first collector collects the primary filtrate. The secondary mixed gas is connected to the second condenser after passing through the heat exchanger. The second condenser condenses the secondary mixed gas into a secondary filtrate. The second collector collects the secondary filtrate.

Images