Gravure system utilizing RTO waste heat

Abstract

The utility model relates to the technical field of gravure, in particular to a gravure system utilizing RTO waste heat. The system comprises a drying oven, a boiler, an RTO device and a first heat exchanger. The first heat exchanger is communicated with the drying oven through a circulating pipeline, and the circulating pipeline comprises a discharge pipe and a discharge pipe which are used for feeding a liquid heating medium into the drying oven from the first heat exchanger; the discharge-in pipe comprises a main path and a first branch path, an inlet and an outlet of the main path are communicated with the first heat exchanger and the drying oven respectively, an inlet and an outlet of the first branch path are communicated with the main path respectively, and the discharge-in pipe is provided with a first valve used for controlling whether liquid enters the first branch path or not; and the boiler is arranged on the first branch. According to the system, the waste heat of the RTO device is subjected to heat exchange through the first heat exchanger to obtain the liquid heating medium, and then the liquid heating medium is conveyed to the drying oven to achieve utilization of the RTO waste heat, the heating efficiency of the liquid heating medium is high, heating is uniform, and the RTO waste heat is effectively utilized.

Description

Technical Field

[0001] The utility model relates to the technical field of gravure printing, in particular to a gravure printing system utilizing the waste heat of an RTO. Background Art

[0002] Gravure printing is a printing method in which the ink on the printing plate except the graphic part is scraped clean, and then an appropriate pressure is applied between the printing plate and the printed material through a pressure printing rubber roller to squeeze the ink from the concave surface onto the printed material. This printing method makes the printed products have the advantages of excellent gradation performance, corresponding to various printing substrates, seamless image printing, and good printing quality stability.

[0003] In gravure printing, there is often an ink jetting process, and it takes some time for the dye to dry completely after attachment. In order to accelerate the drying speed, the current printing machines are all equipped with drying devices. The existing drying devices mainly send hot air into the parts to be dried of the printing equipment through a circulation system after combustion by boilers, heat-conducting oil furnaces, hot-blast furnaces, etc. Since the waste gas emissions of boilers, heat-conducting oil furnaces, hot-blast furnaces, etc. are large, in order to ensure the full drying of the printing machine parts and the drying of batch products, a large amount of fuels such as coal, natural gas, and alcohol are often consumed, which not only causes a large amount of air pollution but also increases the production cost of enterprises.

[0004] At the same time, the waste gas after drying of the current gravure printing equipment cannot be directly discharged due to pollution and other reasons. Generally, it is sent to the waste gas treatment equipment RTO through an induced draft fan through a waste gas collection pipeline for high-temperature combustion and then discharged into the air. Among them, a small part of the heat with a temperature of 80°C to 200°C is discharged into the air, resulting in a waste of heat energy resources.

[0005] Based on this, the patent document with the publication number CN216183798U discloses an RTO waste heat utilization system for a printing device, including a waste heat introduction pipeline that introduces the high-temperature waste gas treated by the RTO combustion chamber into the printing device, a normal-temperature air inlet is arranged on the waste heat introduction pipeline, and a valve for adjusting the amount of fresh air entering is arranged at the normal-temperature air inlet; it also includes an air mixing area with two ends respectively communicating with the waste heat introduction pipeline and the printing device, which mixes the high-temperature waste gas and fresh air, and a first temperature control sensor for measuring the temperature of the mixed air flow is arranged in the air mixing area.

[0006] In this prior art, the hot air is directly introduced into the printing device, that is, air is used as the heat medium. The gas heat medium has problems such as low heat conduction coefficient, low heating efficiency, poor heating uniformity due to strong fluidity, difficult storage, and poor safety, resulting in low utilization rate of the waste heat of the RTO device. Content of the Utility Model

[0007] The present utility model aims to solve the above problems and provides a gravure printing system that uses liquid as the heat medium and can make full use of the waste heat of the RTO.

[0008] The technical solution for the present utility model to solve the problems is to provide a gravure printing system that utilizes the waste heat of the RTO, including a gravure printing device. The gravure printing device includes an oven for drying printed articles and a boiler for heating the oven. It also includes an RTO device for treating the gas discharged from the gravure printing device and a first heat exchanger for heat exchange between the hot flue gas generated by the RTO device and the liquid heat medium. The first heat exchanger is connected to the oven through a circulation pipeline. The circulation pipeline includes a discharge pipe for sending the liquid heat medium from the first heat exchanger to the oven and a discharge pipe for sending the liquid heat medium from the oven back to the first heat exchanger. The discharge pipe includes a main path and a first branch. The inlet and outlet of the main path are respectively connected to the first heat exchanger and the oven. The inlet and outlet of the first branch are respectively connected to the main path. The discharge pipe is provided with a first valve for controlling whether the liquid enters the first branch. The boiler is arranged in the first branch.

[0009] As a preference of the present utility model, the discharge pipe further includes a second branch. The inlet and outlet of the second branch are respectively connected to the main path. The second branch is provided with a storage device for storing the liquid heat medium. The discharge pipe is provided with a second valve for controlling whether the liquid heat medium enters the second branch.

[0010] As a preference of the present utility model, the liquid heat medium is oil.

[0011] As a preference of the present utility model, the discharge pipe is provided with an oil-gas separator. The oil-gas separator includes an oil-gas inlet connected to the oven, an oil outlet connected to the first heat exchanger, and an exhaust port.

[0012] As a preference of the present utility model, it further includes a high-level expansion tank and a low-level storage tank. The oil-gas separator further includes a liquid guide port. The high-level expansion tank includes an air inlet connected to the exhaust port, a high-level liquid inlet connected to the liquid guide port, and further includes an overflow port, a high-level liquid outlet, and a circulation inlet. The low-level storage tank includes a low-level liquid inlet connected to the overflow port and the high-level liquid outlet, a circulation outlet connected to the circulation inlet, and further includes an oil injection port and a waste discharge port.

[0013] As a preference of the present utility model, the low-level storage tank is connected to the discharge pipe.

[0014] As a preference of the present utility model, the boiler includes an intake pipe and an outlet pipe, and a second heat exchanger for heat exchange between the intake pipe and the outlet pipe.

[0015] Preferably, the storage device of the present utility model includes a third heat exchanger for heat exchange between the liquid heat medium and the water medium, and a high-temperature water tank for storing the water medium.

[0016] Preferably, the present utility model further includes a fourth heat exchanger for heat exchange between the exhaust gas pipe and the water medium, and the water medium sequentially passes through the fourth heat exchanger and the third heat exchanger and then enters the high-temperature water tank.

[0017] Preferably, a humidifier is provided in the oven, and the humidifier is communicated with the high-temperature water tank.

[0018] Advantages of the present utility model:

[0019] 1. In this application, the waste heat of the RTO device is used to obtain a liquid heat medium through heat exchange in the first heat exchanger and then transported to the oven to realize the utilization of the RTO waste heat. The liquid heat medium has high heating efficiency and uniform heating, effectively utilizing the RTO waste heat.

[0020] At the same time, based on the original boiler of the gravure printing equipment, the liquid heat medium can be selectively fed into the boiler. When the temperature of the liquid heat medium that has absorbed the RTO waste heat is suitable for the drying temperature required by the oven, it can be directly fed into the oven through the main path; when the temperature of the liquid heat medium that has absorbed the RTO waste heat is lower than the drying temperature required by the oven, the boiler can be started, and the liquid heat medium enters the boiler through the first branch to be heated; when the temperature of the liquid heat medium that has absorbed the RTO waste heat is higher than the drying temperature required by the oven, the liquid heat medium is fed into the stopped boiler through the first branch, which can maintain the temperature in the boiler to reduce the preheating steps of the boiler when it needs to be started later and reduce energy consumption.

[0021] 2. In some embodiments, a storage device is added to the discharge pipe. When the oven does not need heating, the liquid heat medium that has absorbed the RTO waste heat can be stored in the storage device for use when the oven needs heating, reducing the loss of RTO waste heat.

[0022] On this basis, in some embodiments, the storage device uses a third heat exchanger to convert the oil medium into a water medium to obtain high-temperature water, and the high-temperature water is applied to the oven, further utilizing the RTO waste heat while reducing problems such as curling and cracking of the gravure printed items during drying.

[0023] On this basis, in some embodiments, a fourth heat exchanger is added at the boiler, and it is controlled that the water medium first passes through the fourth heat exchanger and then through the third heat exchanger. Then, when the temperature of the liquid heat medium is lower than the required temperature of the oven after heat exchange, the boiler is started, and the boiler generates hot waste gas, so as to preheat the water medium at the fourth heat exchanger; after the preheated water medium enters the third heat exchanger, the temperature difference between the water medium and the oil medium becomes smaller, and less heat of the oil medium is absorbed, so that the temperature of the oil medium after heat exchange at this time increases relative to the temperature of the oil medium in the previous cycle, and is closer to, or even applicable to, the required temperature of the oven. At this time, the boiler can be turned down or turned off to reduce energy consumption.

[0024] 3. In some embodiments, oil is used as the liquid heat medium, and an oil-gas separator, a high-level expansion tank and a low-level storage tank are added to improve the system safety. Description of the Drawings

[0025] Figure 1 is a schematic diagram of Embodiment 1 of a gravure printing system using RTO waste heat;

[0026] Figure 2 is a schematic diagram of Embodiment 2 of a gravure printing system using RTO waste heat;

[0027] In the figure: oven 11, boiler 12, RTO device 2, first heat exchanger 21, storage device 3, third heat exchanger 31, high-temperature water tank 32, oil-gas separator 41, high-level expansion tank 42, low-level storage tank 43. Detailed Embodiments

[0028] The following are the detailed embodiments of the present invention. In combination with the drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

[0029] Embodiment 1

[0030] A gravure printing system using RTO waste heat, such as Figure 1As shown in the figure, the gravure printing system first includes a gravure printing device installed in a workshop building for printing. Generally, it includes an intaglio cylinder for printing, a doctor blade device for scraping off the excess ink on the intaglio cylinder, an ink trough and an ink supply system for supplying ink to the intaglio cylinder, an impression cylinder for cooperating with the intaglio cylinder to achieve ink transfer, and a drying device for accelerating the drying process of the ink on the printed article. The drying device includes an oven 11 for the printed article to enter and exit, and a boiler 12 for heating the oven 11. The boiler 12 introduces air to generate heat by burning natural gas and exchanges the heat to the heat medium. The oven 11 includes an inlet and an outlet for the heat medium to enter and exit. When the heat medium flows from its inlet to the outlet in the oven 11, it exchanges heat with the air and the printed article in the oven 11 to achieve drying. Preferably, the flow direction of the heat medium in the oven 11 is controlled to be opposite to the conveying direction of the printed article in the oven 11, so that the temperature of the front part of the oven 11 is relatively low and the temperature of the rear part is relatively high, forming a temperature gradient, so that the heating degree of the printed article gradually increases, ensuring the drying uniformity of the printed article from the inside to the outside and avoiding the printed article from curling and cracking due to sudden high heat.

[0031] Since waste gas will be generated due to the volatilization of ink solvent during the printing process, the gravure printing system secondly also includes an RTO device 2 for treating the gas discharged from the gravure printing device. The RTO device 2 is fully called a regenerative thermal oxidizer, which is an energy-saving and environmentally friendly device for treating medium and low-concentration volatile organic waste gases (VOCs). Its working principle is to oxidize the organic waste gas to generate carbon dioxide and water at a high temperature (usually ≥760 °C) so as to remove it. The RTO device 2 is heavy and large in volume and is usually only placed outdoors.

[0032] In order to apply the waste heat of the RTO device to the oven 11 and reduce the usage frequency and energy consumption of the traditional boiler 12, a first heat exchanger 21 is first provided. The first heat exchanger 21 is used to exchange heat between the hot flue gas generated by the RTO device and the liquid heat medium. Among them, since the waste heat temperature of the RTO is relatively high, possibly exceeding 100 °C, the liquid heat medium is oil. Secondly, the first heat exchanger 21 is connected to the oven 11 through a circulation pipeline. Specifically: using the inlet and outlet of the above-mentioned oven 11, the first heat exchanger 21 includes a housing. A part of the circulation pipeline is arranged inside the housing, and the housing is arranged on the flue gas discharge pipeline of the RTO device 2. When the hot flue gas flows through the inner cavity of the housing, it will contact this part of the circulation pipeline to exchange heat with the oil medium inside and obtain hot oil. At the same time, the circulation pipeline also includes a discharge pipe and a discharge pipe that are respectively connected to both ends of this part of the pipeline inside the housing. The other end of the discharge pipe is connected to the inlet of the oven 11 and is used to send the hot oil from the first heat exchanger 21 into the oven 11; the other end of the discharge pipe is connected to the outlet of the oven 11 and is used to send the cooled oil medium after heat exchange from the oven 11 back to the first heat exchanger 21, on the one hand, to obtain re-heating of the RTO discharged flue gas, and on the other hand, to cool the RTO discharged flue gas.

[0033] At the same time, since the temperature range of the hot flue gas of the RTO is relatively large, the temperature of the oil medium that absorbs the waste heat of the RTO is unstable. In some cases, it may not be sufficient to provide enough drying heat for the oven 11. Therefore, the original boiler 12 is also introduced into the circulation pipeline and used as an auxiliary when necessary. Specifically: the discharge pipe includes a main path and a first branch. The inlet and outlet of the main path are respectively connected to the heat medium outlet of the first heat exchanger 21 and the inlet of the oven 11. The inlet and outlet of the first branch are respectively connected to the main path, and the boiler 12 is arranged on the first branch. That is to say, the oil medium can directly enter the oven 11 through the main path, or can first enter the front part of the main path, then enter the first branch to flow through the boiler 12, and then enter the latter part of the main path and then enter the oven 11; therefore, the discharge pipe should also be provided with a first valve for controlling whether the liquid enters the first branch. When the temperature of the oil medium that absorbs the waste heat of the RTO is relatively low compared to the temperature required for drying in the oven 11, the boiler 12 can be turned on, and the oil medium enters the boiler 12 through the first branch to be heated up. In some cases, when the temperature of the oil medium that absorbs the waste heat of the RTO is relatively high compared to the temperature required for drying in the oven 11, the oil medium can also be sent into the stopped boiler 12 through the first branch. On the one hand, it can reduce the temperature of the oil medium, and on the other hand, it can maintain the temperature inside the boiler 12, so as to reduce the preheating steps of the boiler when the boiler 12 needs to be turned on later and reduce energy consumption.

[0034] Among them, when the boiler 12 needs to be used, fresh air is introduced and burned together with natural gas. The generated heat is exchanged to the oil medium in the first branch, and the waste gas is discharged. The waste gas also has a certain amount of heat that can be reused. Therefore, in some embodiments, the boiler 12 includes an air inlet pipe for introducing fresh air and an exhaust pipe for discharging waste gas, and also includes a second heat exchanger 121 for heat exchange between the air inlet pipe and the exhaust pipe. The waste gas heat is exchanged to the fresh air through the second heat exchanger 121. On the one hand, the fresh air is preheated to reduce the energy consumption of the boiler 12, and on the other hand, the waste gas is cooled. The setting method of the second heat exchanger 121 is similar to that of the first heat exchanger 21. A housing is also provided, and the housing is arranged on the exhaust pipe, and a part of the air inlet pipe is arranged inside the housing. When the waste gas flows through the inner cavity of the housing, it will contact this part of the air inlet pipe to preheat the fresh air therein.

[0035] In this embodiment, since the heat medium used is an oil medium, in order to ensure the safety of the circulation pipeline, in some embodiments, the discharge pipe is provided with an oil-gas separator 41. The oil-gas separator 41 includes an oil-gas inlet connected to the oven 11, an oil outlet connected to the first heat exchanger 31, and an exhaust port. The oil-gas separator 41 can separate impurities and gases in the oil medium, adjust the pressure in the system, reduce the influence of gases on the working characteristics of the pump or the heat medium system, and maintain the cleanliness of the oil medium. The clean oil medium has better fluidity and heat conduction performance, thereby improving the overall efficiency of the heat medium system.

[0036] Furthermore, a high-level expansion tank 42 and a low-level storage tank 43 are also included; the oil-gas separator 41 also includes a liquid guiding port; the high-level expansion tank 42 includes an air inlet connected to the exhaust port, a high-level liquid inlet connected to the liquid guiding port, and also includes an overflow port, a high-level liquid outlet, and a circulation inlet; the low-level storage tank 43 includes a low-level liquid inlet connected to the overflow port and the high-level liquid outlet, and a circulation outlet connected to the circulation inlet; in addition, the low-level storage tank 43 also includes an oil filling port and a waste discharge port. The high-level expansion tank 42 and the low-level storage tank 43 connected to the oil-gas separator 41 are common designs of the prior art and will not be elaborated here.

[0037] Embodiment 2

[0038] This embodiment is basically the same as Embodiment 1, and the difference lies in:

[0039] Such as Figure 1 And Figure 2As shown, the discharge pipe further includes a second branch. The inlet and outlet of the second branch are respectively connected to the main path, and a storage device 3 is provided in the second branch. The discharge pipe is provided with a second valve for controlling whether the oil medium enters the second branch. The second branch is preferably arranged in the part of the main path between the first branch and the heat medium outlet of the first heat exchanger 21. Therefore, the oil medium can directly pass through the main path or enter the oven 11 via the boiler 12 as in Embodiment 1, or first enter the storage device 3 through the second branch. The oil medium in the storage device 3 can then enter the oven 11 through the main path or via the boiler 12. The design of the storage device 3 enables the oil medium that has absorbed the waste heat of the RTO to be stored when the oven 11 stops working while the RTO device 2 is still working, so as to supply it in time when the oven 11 needs heat supply.

[0040] As Figure 2 As shown, in some embodiments, the low-level storage tank 43 can also be connected to the discharge pipe. The low-level storage tank 43 can also serve as a storage device on the discharge pipe to store the liquid heat medium with a reduced temperature after heat exchange in the oven 11. When the oven 11 is shut down and the RTO device 2 is still working, this part of the low-temperature oil medium can be sent into the first heat exchanger 21 to cool the waste gas discharged from the RTO; at this time, the hot oil after heat exchange in the first heat exchanger 21 enters the storage device 3 for storage.

[0041] The storage device 3 can be an ordinary high-temperature oil tank for storing the oil medium. Or as in this embodiment, the storage device 3 is designed for heat exchange so that the waste heat of the RTO can be further utilized. As Figure 2 As shown, the storage device 3 includes a third heat exchanger 31 for heat-exchanging the oil medium and the water medium, and a high-temperature water tank 32 for storing the water medium. Specifically: the pipes of the second branch and the water pipes are alternately designed. When the oil medium flows in the second branch, it will transfer heat to the water in the water pipes; and the water pipes are connected to the high-temperature water tank 32, so that the hot water obtained by heat exchange can be stored. Under this design, when the temperature of the oil medium that has absorbed the waste heat of the RTO is relatively high compared to the temperature required for drying in the oven 11, the oil medium can pass through the second branch to reduce the temperature of the oil medium to be more suitable for the oven 11, and hot water can also be obtained.

[0042] In some cases, after passing through the third heat exchanger 31, the temperature of the oil medium drops to a level where it is insufficient to provide suitable drying heat for the oven 11, and the boiler 12 needs to be started. Therefore, in some embodiments, it further includes a fourth heat exchanger for heat-exchanging the outlet pipe of the boiler 12 with the water medium, and controlling the water medium to enter the high-temperature water tank 32 after passing through the fourth heat exchanger and the third heat exchanger 31 in sequence. Then, when the temperature of the oil medium after heat exchange is relatively low for the required temperature of the oven 11, the boiler 12 will be started, and the boiler 12 will generate hot exhaust gas, thereby preheating the water medium at the fourth heat exchanger; after the preheated water medium enters the third heat exchanger 31, the temperature difference between it and the oil medium becomes smaller, and less heat of the oil medium is absorbed, so that the temperature of the oil medium after heat exchange at this time increases relative to the temperature of the oil medium in the previous cycle, getting closer to, or even meeting, the required temperature of the oven 11, and the boiler 12 can be turned off at this time to reduce energy consumption. Among them, the design method of the fourth heat exchanger is not limited. It can be an independent heat exchanger, or as in this embodiment, the fourth heat exchanger is directly obtained by transforming the second heat exchanger 121. Specifically: the water pipe is arranged in the shell of the second heat exchanger 121. When the exhaust gas flows through the inner cavity of the shell, it will not only contact the intake pipe, but also contact the water pipe to preheat the water inside; one end of the water pipe is connected to the outlet of the high-temperature water tank 32 through the inlet pipe, and the other end is provided with an outlet pipe connected to the heat medium inlet of the third heat exchanger 31, and then the heat medium outlet of the third heat exchanger 31 is connected to the inlet of the high-temperature water tank 32. In addition, the high-temperature water tank 32 is provided with a liquid filling port for replenishing water.

[0043] The hot water obtained from the above heat exchange can be used in multiple aspects. In this embodiment, a humidifier is provided in the oven 11. The function of the humidifier in the oven 11 is to humidify the printed articles being dried, prevent the base paper of the printed articles from curling, control the drying speed of the ink on the printed articles, ensure uniform drying of the ink during the printing process, and avoid printing quality problems such as cracking caused by too fast drying. By connecting the humidifier to the high-temperature water tank 32, the hot water obtained from the heat exchange can be provided to the oven 11. The hot water with a certain temperature can not only provide humidity but also provide heat in the oven 11, thereby assisting the oven 11 in heating. Among them, the humidifier includes a water guide pipe arranged in the oven 11. One end of the water guide pipe is an inlet connected to the high-temperature water tank 32, and the other end is a closed end, or an outlet is provided and connected to the high-temperature water tank 32 to form a water cycle. A number of spray holes are arranged along the length direction of the water guide pipe body for spraying water mist. Adapted to the above technology of controlling the flow direction of the hot oil in the oven 11 to be opposite to the conveying direction of the printed articles in the oven 11, the direction from the inlet of the water guide pipe to the closed end is also controlled to be opposite to the conveying direction of the printed articles in the oven 11, so that the temperature of the front part of the oven 11 is relatively low and the temperature of the rear part is relatively high, forming a temperature gradient and improving the drying uniformity of the printed articles.

[0044] In some embodiments, the gravure printing system includes an air-conditioning unit for adjusting the temperature in the workshop to ensure the normal operation of the gravure printing equipment. The air-conditioning terminal in the air-conditioning unit is a device for exchanging heat between air and a refrigeration structure or a heating structure to send cold air or hot air into the room. Part of the heating structure is realized through a coil heat exchanger. By inputting hot heat medium into the coil heat exchanger to heat the air, and then discharging the cold heat medium after the heat exchange is completed. Therefore, the high-temperature water tank 32 can also be connected to the air-conditioning terminal through a circulation pipeline to supply heat to it, further utilize the waste heat of the RTO, and reduce the energy consumption of the air-conditioning unit.

[0045] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. An intaglio printing system utilizing the waste heat of RTO, characterized in that: It includes an intaglio printing device, and the intaglio printing device includes an oven (11) for drying printed articles and a boiler (12) for heating the oven (11); It further includes an RTO device (2) for treating the gas discharged from the intaglio printing device and a first heat exchanger (21) for exchanging heat between the hot flue gas generated by the RTO device and a liquid heat medium; The first heat exchanger (21) is connected to the oven (11) through a circulation pipeline. The circulation pipeline includes a drainage pipe for sending the liquid heat medium from the first heat exchanger (21) into the oven (11) and a discharge pipe for sending the liquid heat medium from the oven (11) back to the first heat exchanger (21); The drainage pipe includes a main path and a first branch path. The inlet and outlet of the main path are respectively connected to the first heat exchanger (21) and the oven (11). The inlet and outlet of the first branch path are respectively connected to the main path. The drainage pipe is provided with a first valve for controlling whether the liquid enters the first branch path; The boiler (12) is arranged in the first branch path.

2. An intaglio printing system utilizing the waste heat of RTO according to claim 1, characterized in that: The drainage pipe further includes a second branch path. The inlet and outlet of the second branch path are respectively connected to the main path; The second branch path is provided with a storage device (3) for storing the liquid heat medium, and the drainage pipe is provided with a second valve for controlling whether the liquid heat medium enters the second branch path.

3. A gravure printing system utilizing RTO waste heat according to claim 1 or 2, characterized in that: The liquid heat medium is oil.

4. The gravure printing system using RTO waste heat according to claim 3, characterized in that: The discharge pipe is provided with an oil-gas separator (41). The oil-gas separator (41) includes an oil-gas inlet connected to the oven (11), an oil outlet connected to the first heat exchanger (21), and an exhaust port.

5. A gravure printing system using RTO waste heat according to claim 4, characterized in that: It further includes a high-level expansion tank (42) and a low-level storage tank (43); the oil-gas separator (41) further includes a liquid guiding port; The high-level expansion tank (42) includes an air inlet connected to the exhaust port, a high-level liquid inlet connected to the liquid guiding port, and further includes an overflow port, a high-level liquid outlet, and a circulation inlet; The low-level storage tank (43) includes a low-level liquid inlet connected to the overflow port and the high-level liquid outlet, a circulation outlet connected to the circulation inlet, and further includes an oil filling port and a waste discharge port.

6. The gravure printing system using RTO waste heat according to claim 5, wherein: The low-level storage tank (43) is connected to the discharge pipe.

7. The gravure printing system using RTO waste heat according to claim 2, wherein: The boiler (12) includes an intake pipe and an outlet pipe, and a second heat exchanger (121) for exchanging heat between the intake pipe and the outlet pipe.

8. An intaglio printing system utilizing RTO waste heat according to claim 7, characterized in that: The storage device (3) includes a third heat exchanger (31) for exchanging heat between the liquid heat medium and a water medium, and a high-temperature water tank (32) for storing the water medium.

9. The gravure printing system using RTO waste heat according to claim 8, characterized in that: It further includes a fourth heat exchanger for exchanging heat between the outlet pipe and the water medium. The water medium sequentially passes through the fourth heat exchanger and the third heat exchanger (31) and then enters the high-temperature water tank (32).

10. A gravure printing system utilizing RTO waste heat according to claim 8, characterized in that: A humidifier is arranged in the oven (11), and the humidifier is connected to the high-temperature water tank (32).

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