Coating line heat energy sharing system

Abstract

According to the coating line heat energy sharing system provided by the utility model, the single coating line not only can recycle coating waste gas and discharge the coating waste gas after sufficient incineration and decomposition, but also can exchange heat generated after incineration with fresh air through the arrangement of the fresh air heat exchanger, so that the temperature of the fresh air is increased; then the product coating is supplied to the drying area to be dried; treatment of coating waste gas of a single coating line and recycling of heat are achieved. Meanwhile, through the arrangement of the gas loop, heat energy sharing of the multiple coating lines is achieved, excessive heat energy of a certain coating line can be conveyed to the coating line with insufficient heat energy, recycling of the excessive heat energy in the multiple coating lines is achieved, and the heat energy utilization rate of the coating lines is increased. And meanwhile, the problem that energy consumption and operation cost are increased due to the fact that a certain coating line needs to depend on combustion of natural gas or other energy sources to supplement heat energy due to insufficient heat energy is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of coating line production, and particularly relates to a coating line heat energy sharing system. Background Technique

[0002] In a coating line, the paint and diluent usually generate waste gas containing volatile organic substances, which has a serious negative impact on air quality. In the prior art, an incinerator is usually used to fully incinerate and decompose the waste gas before discharging it. For example, the utility model with the application number CN201922361953.1 discloses an exhaust gas incineration mechanism for incinerating the exhaust gas before discharging it. In actual applications, such as in the coating industry of aluminum coils, a large amount of heat energy is generated after the incinerator fully incinerates the exhaust gas. Currently, each coating line generally operates independently, and the following deficiencies exist:

[0003] When a certain coating line produces high-film-thickness products, the heat energy generated by burning the combustible waste gas volatilized from a large amount of paint and diluent and drawn back to the incinerator often exceeds the actual demand for the set temperature required by the curing oven of this line, resulting in heat energy surplus; at the same time, other coating lines producing low-film-thickness (such as DOS material or low-film-thickness) products do not volatilize enough combustible gas for combustion, so they lack heat energy and need to rely heavily on natural gas or other energy sources for combustion to supplement heat energy, thus increasing energy consumption and operating costs. Summary of the Utility Model

[0004] In view of this, the purpose of the utility model is to provide a coating line heat energy sharing system to solve the above problems.

[0005] The utility model adopts the following scheme:

[0006] The present application provides a coating line heat energy sharing system, which includes multiple coating lines. Each coating line includes an incinerator, an exhaust gas heat exchanger connected to the intake port of the incinerator, an exhaust gas fan for introducing coating exhaust gas into the exhaust gas heat exchanger through an exhaust gas pipeline, a fresh air heat exchanger connected to the exhaust port of the incinerator, a fresh air pipeline and an exhaust gas discharge pipeline connected to the fresh air heat exchanger, a fresh air fan for introducing fresh air into the fresh air pipeline and delivering the heat-exchanged fresh air to the drying area, and a flue gas fan arranged on the exhaust gas discharge pipeline for discharging the incinerated flue gas; a gas circuit capable of controlling the flue gas flow direction is arranged between the exhaust ports of the incinerators of multiple coating lines.

[0007] Furthermore, the gas circuit is formed with a first circuit that conveys the high-temperature flue gas generated by the first incinerator from the first exhaust port to the second fresh air heat exchanger; and a second circuit that conveys the high-temperature flue gas generated by the second incinerator from the second exhaust port to the first fresh air heat exchanger; and the on-off of the first circuit and the second circuit can be independently controlled respectively.

[0008] Furthermore, the first circuit includes a first pipeline, a first air box, an interconnection pipeline, a second air box, and a second pipeline that are sequentially arranged between the two exhaust ports; the second circuit includes a third pipeline, the second air box, the interconnection pipeline, the first air box, and a fourth pipeline that are sequentially arranged between the two exhaust ports; a first valve, a first fan, and a second valve are sequentially arranged on the first pipeline; a third valve is arranged on the second pipeline; a fourth valve, a second fan, and a fifth valve are sequentially arranged on the third pipeline; a sixth valve is arranged on the fourth pipeline.

[0009] Furthermore, the fresh air pipeline includes an air inlet pipeline connected to the air inlet of the fresh air heat exchanger, and an air outlet pipeline connected to the air outlet of the fresh air heat exchanger; the fresh air fan is arranged on the air inlet pipeline; a plurality of air outlets are arranged on the air outlet pipeline and are respectively used for supplying to each drying area of the coating line.

[0010] Furthermore, a water-gas heat exchanger is also arranged on the waste gas discharge pipeline.

[0011] Furthermore, the temperature of the flue gas after being heat-exchanged by the waste gas heat exchanger is 500 - 550 °C, the temperature after being further heat-exchanged by the fresh air heat exchanger is 300 - 350 °C, and the temperature after being finally heat-exchanged by the water-gas heat exchanger is about 200 °C.

[0012] Furthermore, the temperature of the fresh air after passing through the fresh air heat exchanger is 450 - 500 °C.

[0013] By adopting the above technical solutions, the following technical effects can be achieved by the present utility model:

[0014] The utility model provides a thermal energy sharing system for a painting line. A single painting line can not only recover the coating waste gas, fully incinerate and decompose it before discharging, but also, through the setting of a fresh air heat exchanger, exchange heat between the heat generated after incineration and the fresh air to increase the temperature of the fresh air, and then supply it to the drying area to dry the product coating; thus, the treatment of the coating waste gas of a single painting line and the recovery and utilization of heat are realized. At the same time, through the setting of a gas circuit, the sharing of thermal energy among multiple painting lines is realized, and the excess thermal energy of a certain painting line can be transported to the painting line with insufficient thermal energy, which not only solves the recovery and utilization of the excess thermal energy in multiple painting lines, but also solves the problem that a certain painting line needs to rely heavily on natural gas or other energy combustion to supplement thermal energy due to insufficient thermal energy, thereby increasing energy consumption and operating costs. Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 It is a schematic structural diagram of a single painting line in a thermal energy sharing system for a painting line according to an embodiment of the present utility model;

[0017] Figure 2 It is a schematic structural diagram of a thermal energy sharing system for a painting line according to an embodiment of the present utility model;

[0018] Reference numerals: incinerator 1, waste gas heat exchanger 2, waste gas fan 3, fresh air heat exchanger 4, air inlet pipeline 5, waste gas discharge pipeline 6, air outlet pipeline 7, waste gas pipeline 8, first incinerator 9, second incinerator 10, second fresh air heat exchanger 11, first fresh air heat exchanger 12, first pipeline 13, interconnection pipeline 14, second pipeline 15, third pipeline 16, fourth pipeline 17, first valve 18, first fan 19, second valve 20, first air box 21, second air box 22, third valve 23, fourth valve 24, second fan 25, fifth valve 26, sixth valve 27, first waste gas heat exchanger 28, second waste gas heat exchanger 29, water-vapor heat exchanger 30. Detailed Embodiments

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model. Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the present utility model to be protected, but merely represents the selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0020] Embodiment

[0021] Combined with Figure 1 And Figure 2 As shown in the figure, this embodiment provides a thermal energy sharing system for a coating line, which includes multiple coating lines. The coating line includes an incinerator 1, an exhaust gas heat exchanger 2 connected to the air inlet of the incinerator 1, an exhaust gas fan 3 for introducing coating exhaust gas into the exhaust gas heat exchanger 2 through an exhaust gas pipeline 8, a fresh air heat exchanger 4 connected to the exhaust port of the incinerator 1, a fresh air pipeline and an exhaust gas discharge pipeline 6 connected to the fresh air heat exchanger 4, a fresh air fan for introducing fresh air into the fresh air pipeline and delivering the heat-exchanged fresh air to the drying area, and a flue gas fan provided on the exhaust gas discharge pipeline 6 for discharging the incinerated flue gas; A gas circuit capable of controlling the flow direction of the flue gas is provided between the exhaust ports of the incinerators 1 of the multiple coating lines.

[0022] In this application, a single coating line can not only recover coating exhaust gas and perform full incineration and decomposition before discharging, but also, through the setting of the fresh air heat exchanger 4, exchange heat between the heat generated after incineration and fresh air to increase the temperature of the fresh air, and then supply it to the drying area to dry the product coating; realizing the treatment of coating exhaust gas of a single coating line and the recovery and utilization of heat. At the same time, through the setting of the gas circuit, the sharing of thermal energy among multiple coating lines is realized, and the excess thermal energy of a certain coating line can be transported to the coating line with insufficient thermal energy, which not only solves the recovery and utilization of excess thermal energy in multiple coating lines, but also solves the problem that a certain coating line needs to rely heavily on natural gas or other energy combustion to supplement thermal energy due to insufficient thermal energy, thus increasing energy consumption and operating costs.

[0023] In this embodiment, as shown in Figure 1The single coating line shown can not only recover the coating waste gas, fully incinerate and decompose it before discharging, but also, through the setting of the fresh air heat exchanger 4, exchange heat between the heat generated after incineration and the fresh air to increase the temperature of the fresh air, and then supply it to the drying area to dry the product coating; thus realizing the treatment of the coating waste gas of the single coating line and the recycling of heat

[0024] As Figure 2 shown, taking two coating lines as an example, they are coating line A and coating line B respectively. The gas circuit forms a first circuit that conveys the high-temperature flue gas generated by the first incinerator 9 in coating line A from the first exhaust port to the second fresh air heat exchanger 11 in coating line B; and a second circuit that conveys the high-temperature flue gas generated by the second incinerator 10 in coating line B from the second exhaust port to the first fresh air heat exchanger 12 in coating line A; and the on-off of the first circuit and the second circuit can be independently controlled respectively. Wherein, the fresh air pipeline in each coating line includes an air inlet pipeline 5 connected to the air inlet of the fresh air heat exchanger 4, and an air outlet pipeline 7 connected to the air outlet of the fresh air heat exchanger 4; the fresh air fan is arranged on the air inlet pipeline 5; a plurality of air outlets are arranged on the air outlet pipeline 7, which are respectively used to supply to each drying area of the coating line.

[0025] Specifically, the first circuit includes a first pipeline 13, a first air box 21, an intercommunication pipeline 14, a second air box 22, and a second pipeline 15 arranged in sequence between the two exhaust ports; the second circuit includes a third pipeline 16, the second air box 22, the intercommunication pipeline 14, the first air box 21, and a fourth pipeline 17 arranged in sequence between the two exhaust ports; a first valve 18, a first fan 19, and a second valve 20 are arranged in sequence on the first pipeline 13; a third valve 23 is arranged on the second pipeline 15; a fourth valve 24, a second fan 25, and a fifth valve 26 are arranged in sequence on the third pipeline 16; a sixth valve 27 is arranged on the fourth pipeline 17.

[0026] When the heat energy generated in the A painting line is excessive, open the first valve 18, the first fan 19, the second valve 20, and the third valve 23, and at the same time close the fourth valve 24, the second fan 25, the fifth valve 26, and the sixth valve 27. At this time, the high-temperature flue gas generated in the A painting line can be transported along the first circuit to the second fresh air heat exchanger 11 in the B painting line after heat exchange through the first waste gas heat exchanger 28, so as to heat and raise the temperature of the fresh air in the second fresh air pipeline of the B painting line, and then transport the heated fresh air to the drying area in the B painting line. Conversely, when the heat energy generated in the B painting line is excessive, open the fourth valve 24, the second fan 25, the fifth valve 26, and the sixth valve 27, and at the same time close the first valve 18, the first fan 19, the second valve 20, and the third valve 23. At this time, the high-temperature flue gas generated in the B painting line can be transported along the second circuit to the first fresh air heat exchanger 12 in the A painting line after heat exchange through the second waste gas heat exchanger 29, so as to heat and raise the temperature of the fresh air in the first fresh air pipeline of the A painting line, and then transport the heated fresh air to the drying area in the A painting line.

[0027] In this embodiment, a water-gas heat exchanger 30 is further provided on the waste gas discharge pipeline 6 to further exchange heat of the flue gas to reduce the temperature of the flue gas. Specifically, the temperature of the flue gas after heat exchange through the waste gas heat exchanger 2 is 500 - 550 °C, the temperature after further heat exchange through the fresh air heat exchanger 4 is 300 - 350 °C, and the temperature after finally exchanging heat through the water-gas heat exchanger 30 is about 200 °C, and the flue gas is discharged through the flue gas fan. The temperature of the fresh air after passing through the fresh air heat exchanger 4 is 450 - 500 °C.

[0028] The above is only the preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the idea of the present invention belong to the protection scope of the present invention.

[0029] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality of" means two or more, unless otherwise specifically defined.

[0031] In the present utility model, unless otherwise clearly specified and defined, terms such as "installed", "connected", "joined", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0032] In the present utility model, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "below" and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

Claims

1. A coating line heat sharing system, characterized in that: The invention comprises a plurality of coating lines, which include an incinerator, an exhaust gas heat exchanger connected to the air inlet of the incinerator, an exhaust gas fan for introducing coating exhaust gas into the exhaust gas heat exchanger through an exhaust gas pipeline, a fresh air heat exchanger connected to the exhaust port of the incinerator, a fresh air pipeline and an exhaust gas discharge pipeline connected to the fresh air heat exchanger, a fresh air fan for introducing fresh air into the fresh air pipeline and conveying the fresh air after heat exchange to a drying area, and a flue gas fan arranged on the exhaust gas discharge pipeline for discharging the flue gas after incineration; a gas circuit capable of controlling the flow direction of the flue gas is arranged between the exhaust ports of the incinerators of the plurality of coating lines.

2. The coating line heat energy sharing system according to claim 1, characterized in that: The gas circuit forms a first circuit for transporting the high-temperature flue gas generated by the first incinerator from the first exhaust port to the second fresh air heat exchanger; and a second circuit for transporting the high-temperature flue gas generated by the second incinerator from the second exhaust port to the first fresh air heat exchanger; and the on and off of the first circuit and the second circuit can be independently controlled.

3. The coating line heat energy sharing system according to claim 2, characterized in that: The first circuit includes a first pipeline, an interconnecting pipeline, and a second pipeline which are connected in sequence between the two exhaust ports; the second circuit includes a third pipeline, the interconnecting pipeline, and a fourth pipeline which are connected in sequence between the two exhaust ports; a first valve, a first fan, and a second valve are sequentially arranged on the first pipeline; a third valve is arranged on the second pipeline; a fourth valve, a second fan, and a fifth valve are sequentially arranged on the third pipeline; and a sixth valve is arranged on the fourth pipeline.

4. The coating line heat energy sharing system according to claim 1, characterized in that: The fresh air duct includes an air inlet duct connected to the air inlet of the fresh air heat exchanger, and an air outlet duct connected to the air outlet of the fresh air heat exchanger; the fresh air fan is arranged on the air inlet duct; a plurality of air outlets are arranged on the air outlet duct, which are respectively used to supply air to various drying areas of the coating line.

5. The coating line heat energy sharing system according to claim 1, characterized in that: A water-gas heat exchanger is also arranged on the exhaust gas discharge pipeline.

6. The coating line heat energy sharing system according to claim 5, characterized in that: The temperature of the flue gas after heat exchange through the exhaust gas heat exchanger is 500-550°C, the temperature after heat exchange through the fresh air heat exchanger is 300-350°C, and the temperature after heat exchange through the water-gas heat exchanger is about 200°C.

7. The coating line heat sharing system according to any one of claims 1 to 6, characterized in that: The temperature of the fresh air after passing through the fresh air heat exchanger is 450-500°C.

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