Tinplate Energy-saving and Environment-friendly Treatment System

Abstract

The present invention discloses an energy-saving and environment-friendly treatment system for tinplate, comprising: a heat accumulator, a first heat exchanger, a drying chamber and a painting chamber. The heat accumulator includes: a heat accumulator housing, a heat storage medium, an electric heating tube, a high-temperature heat storage medium outlet and a low-temperature heat storage medium inlet. The first heat exchanger is provided with a high-temperature heat storage medium inlet, a low-temperature heat storage medium outlet, a high-temperature steam outlet and a low-temperature liquid inlet. The high-temperature heat storage medium inlet is communicated with the high-temperature heat storage medium outlet of the heat accumulator, the low-temperature heat storage medium outlet is communicated with the low-temperature heat storage medium inlet of the heat accumulator, and the high-temperature steam outlet is communicated with the drying steam inlet of the drying chamber. During the low electricity consumption period, the electric heating tube is started, and the heat storage medium enters the heat storage state. When the high electricity consumption period arrives, the electric heating tube is turned off, and the heat storage medium enters the heat release state. It enters the first heat exchanger from the high-temperature heat storage medium outlet, exchanges heat with cold water, and the formed high-temperature water steam enters the heating device in the drying chamber to dry the tinplate products.

Description

Technical Field

[0001] The present invention relates to the technical field of metal material processing, and particularly relates to a tinplate processing system. Background Art

[0002] Tinplate, also known as tin-coated iron, is the common name for electroplated tin thin steel sheets, referring to cold-rolled low-carbon thin steel sheets or steel strips with commercially pure tin plated on both sides. Tin mainly serves to prevent corrosion and rust. It combines the strength and formability of steel with the corrosion resistance, solderability, and beautiful appearance of tin in one material, and has the characteristics of corrosion resistance, non-toxicity, high strength, and good ductility.

[0003] Tinplate is often processed into cans. For aesthetics, people usually print patterns on tinplate, making tinplate metal cans not only play a role in food preservation but also have an aesthetic decoration function, and can attract customers' attention more. During the processing of tinplate cans, usually after processes such as pickling and alkali washing for oil treatment, the surface of the tinplate is dried and painted. The drying process requires a large amount of heat energy, and the treatment of VOC gases containing organic substances generated during the painting process are all problems that need to be urgently solved in the tinplate processing process.

[0004] Converting electrical energy into heat energy is an environmentally friendly method often used in current industrial production. With the development of China's industry and economy, the difference between the peak and valley of urban electricity consumption is increasing day by day. Such a large difference between the peak and valley of electricity and a high peak growth rate pose higher requirements for power peak regulation and pose a certain threat to the safe operation of the power grid. In order to reduce the load pressure during the peak period of the power grid, currently, measures such as implementing time-of-use electricity prices for peak and valley periods are taken to guide users to make full use of off-peak electricity, achieving peak shaving and valley filling, load shifting for peak regulation, and smoothing the electricity load curve, so as to reduce the unit electricity cost.

[0005] Making full use of electrical energy during the off-peak period and converting it into the required heat energy can not only reduce the production cost of electricity-consuming units, but also reduce the pressure on power supply units, achieve a win-win situation for both supply and demand, and thus improve the overall social benefits.

[0006] During the painting process of tinplate, volatile organic gases (referred to as VOC organic waste gases for short) will inevitably be generated. Directly discharging these organic gases into the atmosphere will cause certain environmental pollution. Therefore, these organic gases need to be harmlessly treated before being discharged.

[0007] Therefore, finding a tinplate environmental protection processing system that can utilize low-cost electrical energy during off-peak electricity consumption periods to convert it into heat energy and can effectively treat VOC organic waste gases during the painting process has become an urgent problem to be solved. Summary of the Invention

[0008] The object of the present invention is to provide a tinplate environmental protection processing system in view of the deficiencies of the above-mentioned prior art, which can effectively utilize the electric energy during low-valley power consumption periods, reduce organic gas emissions, and at the same time improve the production efficiency of tinplate.

[0009] To achieve the above object, the present invention provides a tinplate energy-saving and environmental protection treatment system, including: a heat accumulator, a first heat exchanger, a drying chamber, and a painting chamber connected to the drying chamber. The drying chamber includes: a drying cavity, a tinplate product inlet provided on one side of the drying cavity, a tinplate product outlet provided on the other side of the drying cavity, a drying steam inlet, and a condensate outlet; the heat accumulator includes: a heat accumulator housing, a heat storage medium accommodated in the heat accumulator housing, several groups of electric heating tubes evenly distributed on the inner wall of the heat accumulator housing, a high-temperature heat storage medium outlet and a low-temperature heat storage medium inlet opened on the heat accumulator housing, and control valves are provided on several groups of electric heating tubes; the first heat exchanger is provided with a high-temperature heat storage medium inlet, a low-temperature heat storage medium outlet, a high-temperature steam outlet, and a low-temperature liquid inlet. The high-temperature heat storage medium inlet is communicated with the high-temperature heat storage medium outlet of the heat accumulator, the low-temperature heat storage medium outlet is communicated with the low-temperature heat storage medium inlet of the heat accumulator, the high-temperature steam outlet is communicated with the drying steam inlet of the drying chamber, and the low-temperature liquid inlet is communicated with a cold water source; thus, during the low-valley power consumption period, the electric heating tubes of the heat accumulator are started, and the heat storage medium in the heat accumulator housing enters the heat storage state; when it is the peak power consumption period, the electric heating tubes of the heat accumulator are closed, and the heat storage medium in the heat accumulator housing enters the heat release state, and enters the first heat exchanger from the high-temperature heat storage medium outlet through the high-temperature heat storage medium inlet of the first heat exchanger, exchanges heat with cold water and then returns to the heat accumulator. The steam formed in the first heat exchanger enters the drying cavity along the high-temperature steam outlet of the heat exchanger through the drying steam inlet of the drying chamber to dry the tinplate products in the drying cavity.

[0010] Thus, by turning on the electric heating tubes during the low-valley power consumption period, the heat energy is converted into the heat energy of the heat storage medium, and the heat storage medium is gradually heated to about 350-400 degrees Celsius. During the peak power consumption period, the electric heating tubes can be turned off, and then the molten heat storage medium is exchanged with water through the first heat exchanger to form steam at 150-165 degrees Celsius, and the steam is used to dry the tinplate products that have completed pickling and alkali washing.

[0011] Preferably, heat-insulating outer shells are provided on the four walls of the heat accumulator housing.

[0012] Optionally, it further includes a combustion chamber connected to the spray painting chamber. The spray painting chamber includes: a spray painting chamber, an inlet for the product to be spray painted provided on one side of the spray painting chamber, an outlet for the spray painted product provided on the other side of the spray painting chamber, a transmission device connected to the inlet for the product to be spray painted and the outlet for the spray painted product, and a plurality of VOC organic waste gas discharge outlets provided on the top wall of the spray painting chamber. The inlet for the product to be spray painted is connected to the outlet for the tinplate product of the drying chamber; the combustion chamber includes: a combustion chamber, a fuel nozzle provided on one end wall of the combustion chamber, a VOC organic waste gas inlet provided on one side of the combustion chamber, an auxiliary combustion gas inlet provided on the other end wall of the combustion chamber, and a flue gas outlet provided on the other side of the combustion chamber. The VOC organic waste gas inlet is communicated with the VOC organic waste gas discharge outlet of the spray painting chamber through a pipeline. The auxiliary combustion gas inlet is connected to an air source, and the flue gas outlet is connected to a chimney.

[0013] Thus, the organic gas generated during the spray painting process can be removed by incineration using the combustion chamber, effectively purifying the harmful components of the flue gas discharged into the atmosphere.

[0014] Optionally, a waste heat boiler is further provided between the combustion chamber and the chimney. The waste heat boiler is provided with a high-temperature flue gas inlet, a low-temperature flue gas outlet, a cold water inlet, and a steam outlet. The high-temperature flue gas inlet is communicated with the flue gas outlet of the combustion chamber. The low-temperature flue gas outlet is connected to the chimney. The steam outlet is connected to the drying steam inlet of the drying chamber, and the cold water inlet is connected to a cold water source.

[0015] Thus, the waste heat of the high-temperature flue gas discharged from the combustion chamber can be effectively utilized through the waste heat boiler to heat water into steam at about 165 degrees Celsius and then supply it to the drying chamber for use as drying steam, which not only realizes the energy cycle but also achieves environmental protection of the atmosphere.

[0016] Optionally, the condensate outlet of the drying chamber is communicated with the low-temperature liquid inlet of the first heat exchanger. Thus, the condensate in the drying chamber can be recycled.

[0017] Optionally, a partition is provided in the middle of the heat storage shell of the heat accumulator to divide the heat storage shell into an upper part and a lower part. The high-temperature heat storage medium outlet and the low-temperature heat storage medium inlet are arranged in the upper part of the heat storage shell. A high-temperature heat transfer oil outlet and a low-temperature heat transfer oil inlet are respectively provided in the lower part of the heat storage shell. A coiled heat transfer oil pipeline placed between the heat storage media is connected between the high-temperature heat transfer oil outlet and the low-temperature heat transfer oil inlet.

[0018] Optionally, it further includes a second heat exchanger. The second heat exchanger is provided with a high-temperature heat transfer oil inlet, a low-temperature heat transfer oil outlet, a high-temperature gas outlet, and a low-temperature gas inlet. The high-temperature heat transfer oil inlet is communicated with the high-temperature heat transfer oil outlet of the heat accumulator, and the low-temperature heat transfer oil outlet is communicated with the low-temperature heat transfer oil inlet of the heat accumulator.

[0019] Optionally, a preheating chamber is further provided between the drying chamber and the painting chamber. The preheating chamber includes: a preheating chamber, a preheating inlet provided on one side of the preheating chamber, a preheating outlet provided on the other side of the preheating chamber, a plurality of drying gas inlets provided on one end wall of the preheating chamber, and a drying gas outlet provided on the other end wall of the preheating chamber. The drying gas inlets are connected to the high-temperature gas outlet of the second heat exchanger through pipelines.

[0020] Optionally, the drying gas outlet of the preheating chamber is connected to the combustion-supporting gas inlet of the combustion chamber.

[0021] Thus, the heat transfer oil is heated to 250 - 300 degrees Celsius by using the molten heat storage medium. Through the second heat exchanger, the heat transfer oil exchanges heat with cold air to form hot air at 180 - 220 degrees Celsius, which is transported to the preheating chamber to preheat the tinplate products after drying before painting, thus having a better painting effect.

[0022] Optionally, the drying gas outlet of the preheating chamber is connected to the combustion-supporting gas inlet of the combustion chamber.

[0023] Thus, the drying gas at 120 - 150 degrees Celsius after drying enters the combustion chamber as the combustion-supporting gas, which can not only improve the combustion efficiency but also ensure the temperature balance, further ensuring the complete decomposition of organic gases.

[0024] Optionally, the heat storage medium is nitrate, and the nitrate can be one or a combination of sodium nitrate, potassium nitrate, lithium nitrate, or calcium nitrate.

[0025] Optionally, the high-temperature heat storage medium inlet of the first heat exchanger is connected to the high-temperature heat storage medium outlet of the heat accumulator through the first heat storage pipeline, and the low-temperature heat storage medium outlet of the first heat exchanger is connected to the low-temperature heat storage medium inlet of the heat accumulator through the second heat storage pipeline. Heat storage valves and pipe pumps are respectively provided on the first heat storage pipeline and the second heat storage pipeline.

[0026] Compared with the prior art, the present invention has the following beneficial effects: (1) It can effectively utilize the cheap electricity during the off-peak period of night electricity consumption, reducing the production cost of the entire system; (2) It burns the organic gases generated during painting to ensure the complete decomposition of organic gases, thus ensuring that the discharged gases meet the environmental emission standards; (3) It uses the heat of the high-temperature flue gas emitted by the combustion of organic gases, and re-introduces the formed water vapor into the drying chamber as drying steam, realizing the recycling of energy and making the entire system more energy-saving and environmentally friendly; (4) It divides the heat storage chamber into two parts for use, providing both the heat energy required for drying steam and the heat energy required for preheating gas, realizing the self-sufficiency of energy and improving the energy utilization rate. Description of the Drawings

[0027] Figure 1It is a schematic structural diagram of the tinplate energy-saving and environmental protection treatment system of the present invention.

[0028] Figure 2 It is a schematic structural diagram of the heat accumulator of the present invention. Specific embodiments

[0029] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0030] First, please refer to Figure 1 , according to a non-limiting embodiment of the present invention, the tinplate energy-saving and environmental protection treatment system of the present invention includes: a drying chamber 10, a heat accumulator 20, a first heat exchanger 30, and a painting chamber 40.

[0031] In this non-limiting embodiment, the drying chamber 10 includes: a drying cavity 101, a tinplate product inlet 102, a tinplate product outlet 103, a drying steam inlet 104, and a condensate outlet 105.

[0032] The heat accumulator 20 includes: a heat accumulator housing 201, a heat storage medium 202 accommodated in the heat accumulator housing 201, four groups of electric heating tubes 203 evenly distributed on the inner wall of the heat accumulator housing 201, a high-temperature heat storage medium outlet 204 and a low-temperature heat storage medium inlet 205 opened on the heat accumulator housing, and control valves V are provided on each of the four groups of electric heating tubes 203.

[0033] The first heat exchanger 30 is provided with a high-temperature heat storage medium inlet 301, a low-temperature heat storage medium outlet 302, a high-temperature steam outlet 303, and a low-temperature liquid inlet 304. The high-temperature heat storage medium inlet 301 is connected to the high-temperature heat storage medium outlet 204 of the heat accumulator 20 through a first heat storage pipeline L1, the low-temperature heat storage medium outlet 302 is connected to the low-temperature heat storage medium inlet 205 of the heat accumulator 20 through a second heat storage pipeline L2, the high-temperature steam outlet 303 is connected to the drying steam inlet 104 of the drying chamber 10, the low-temperature liquid inlet 304 is connected to a cold water source (not shown in the figure), and heat storage valves F and tube pumps P are respectively provided on the first heat storage pipeline L1 and the second heat storage pipeline L2.

[0034] The painting chamber 40 includes: a painting chamber 401, a product to be painted inlet 402, a painted product outlet 403, a transmission device (not shown in the figure), and three VOC organic waste gas discharge outlets 404, and the product to be painted inlet 402 is connected to the tinplate product outlet 103 of the drying chamber 10.

[0035] Therefore, at the low electricity consumption period, the valve V of the electric heating pipe 203 of the heat accumulator 20 is opened, and the heat storage medium 202 in the heat accumulator housing 201 enters the heat storage state. When it comes to the high electricity consumption period, the valve V of the electric heating pipe 203 of the heat accumulator 20 is closed, and the heat storage medium 202 in the heat accumulator housing 201 enters the heat release state. The heat storage valve F of the first heat storage pipeline L1 is opened. Under the action of the pipe pump P, the heat storage medium 202 enters the first heat exchanger 30 from the high-temperature heat storage medium outlet 204 through the high-temperature heat storage medium inlet 301 of the first heat exchanger 30, exchanges heat with cold water, and then returns to the heat accumulator 20 through the second heat storage pipeline L2. The water vapor formed in the first heat exchanger 30 enters the drying cavity 101 of the drying chamber 10 along the high-temperature steam outlet 303 of the heat exchanger 30 through the drying steam inlet 104 of the drying chamber 10, and dries the tinplate products in the drying cavity 101.

[0036] On the other hand, during the high electricity consumption period, the valve V of some of the electric heating pipes 203 of the heat accumulator 20 can also be closed, that is, only some of the electric heating pipes work, so that the heat storage medium can still maintain a high temperature state during the heat release process.

[0037] Therefore, by turning on the electric heating pipe during the low electricity consumption period, the heat energy is converted into the heat energy of the heat storage medium, and the heat storage medium is gradually heated to about 350 - 400 degrees Celsius. During the high electricity consumption period, the electric heating pipe can be turned off, and then the molten heat storage medium is exchanged with water through the first heat exchanger to form steam at 150 - 165 degrees Celsius, and the steam is used to dry the tinplate products that have completed pickling and alkali washing.

[0038] In this non-limiting embodiment, as Figure 1 shown, there is also a combustion chamber 50 and a waste heat boiler 60.

[0039] The combustion chamber 50 includes: a combustion chamber 501, a VOC organic waste gas inlet 502, an auxiliary gas inlet 503, a flue gas outlet 504, and a fuel nozzle 505. The VOC organic waste gas inlet 502 is connected to the VOC organic waste gas discharge outlet 404 of the painting chamber 40 through a pipeline.

[0040] The waste heat boiler 60 is provided with a high-temperature flue gas inlet 601, a low-temperature flue gas outlet 602, a cold water inlet 603, and a steam outlet 604. The high-temperature flue gas inlet 601 is connected to the flue gas outlet 504 of the combustion chamber 50, the low-temperature flue gas outlet 602 is connected to a chimney (not shown in the figure), the steam outlet 604 is connected to the drying steam inlet 104 of the drying chamber 10, and the cold water inlet 603 is connected to a cold water source (not shown in the figure).

[0041] Thus, the waste heat of the high-temperature flue gas discharged from the combustion chamber 50 can be effectively utilized through the waste heat boiler 60 to heat water into steam at about 165 degrees Celsius, which is then supplied to the drying chamber 10 for use as drying steam, achieving both energy recycling and environmental protection of the atmosphere.

[0042] As Figure 1 shown, the condensate outlet 105 of the drying chamber 10 is connected to the low-temperature liquid inlet 304 of the first heat exchanger 30, whereby the condensate in the drying chamber 10 can be recycled.

[0043] As another non-limiting embodiment, as Figure 2 shown, a partition 208 is provided in the middle of the heat storage tank housing 201 of the heat accumulator 20 to divide the heat storage tank housing 201 into an upper part 201A and a lower part 201B. The high-temperature heat storage medium outlet 204 and the low-temperature heat storage medium inlet 205 are provided in the upper part 201A of the heat storage tank housing. A high-temperature heat transfer oil outlet 206 and a low-temperature heat transfer oil inlet 207 are respectively provided in the lower part 201B of the heat storage tank housing. A coiled heat transfer oil pipeline (not shown in the figure) placed among the heat storage media 202 is connected between the high-temperature heat transfer oil outlet 206 and the low-temperature heat transfer oil inlet 207.

[0044] As another non-limiting embodiment, it further includes a second heat exchanger 70 and a preheating chamber 80 provided between the drying chamber 10 and the painting chamber 40.

[0045] The second heat exchanger 70 is provided with a high-temperature heat transfer oil inlet 701, a low-temperature heat transfer oil outlet 702, a high-temperature gas outlet 703, and a low-temperature gas inlet 704. The high-temperature heat transfer oil inlet 701 is connected to the high-temperature heat transfer oil outlet 206 of the heat accumulator 20, and the low-temperature heat transfer oil outlet 702 is connected to the low-temperature heat transfer oil inlet 207 of the heat accumulator 20.

[0046] The preheating chamber 80 includes: a preheating chamber 801, a preheating inlet 802, a preheating outlet 803, a drying gas inlet 804, and a drying gas outlet 805. The drying gas inlet 804 is connected to the high-temperature gas outlet 703 of the second heat exchanger 70 through a pipeline.

[0047] Thus, the heat transfer oil is heated to 250 - 300 degrees Celsius by the molten heat storage medium 202. Through the second heat exchanger 70, the heat transfer oil exchanges heat with cold air to form hot air at 180 - 220 degrees Celsius, which is transported to the preheating chamber 80 to preheat the tinplate products after drying before painting, thereby achieving a better painting effect.

[0048] As another alternative, as Figure 1As shown, the drying gas outlet 805 of the preheating chamber 80 is connected to the combustion-supporting gas inlet 503 of the combustion chamber 50. Thus, the drying gas at 120 to 150 degrees Celsius after drying enters the combustion chamber as the combustion-supporting gas, which can not only improve the combustion efficiency but also ensure the temperature balance, further ensuring the complete decomposition of the organic gas.

[0049] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0050] Although the preferred embodiments of the present invention have been described in detail herein, it should be understood that the present invention is not limited to the specific structures and steps described and illustrated herein in detail, and other variations and modifications can be implemented by those skilled in the art without departing from the essence and scope of the present invention.

Claims

1. A tinplate energy-saving and environmental protection treatment system, comprising: A drying chamber and a painting chamber connected to the drying chamber. The drying chamber includes: a drying cavity, a tinplate product inlet provided on one side of the drying cavity, a tinplate product outlet provided on the other side of the drying cavity, a drying steam inlet, and a condensate outlet. It is characterized in that it further includes a heat accumulator and a first heat exchanger. Among them, the heat accumulator includes: a heat accumulator housing, a heat storage medium contained in the heat accumulator housing, several groups of electric heating tubes evenly distributed on the inner wall of the heat accumulator housing, a high-temperature heat storage medium outlet and a low-temperature heat storage medium inlet opened on the heat accumulator housing. Control valves are provided for the several groups of electric heating tubes. The first heat exchanger is provided with a high-temperature heat storage medium inlet, a low-temperature heat storage medium outlet, a high-temperature steam outlet, and a low-temperature liquid inlet. The high-temperature heat storage medium inlet is communicated with the high-temperature heat storage medium outlet of the heat accumulator. The low-temperature heat storage medium outlet is communicated with the low-temperature heat storage medium inlet of the heat accumulator. The high-temperature steam outlet is communicated with the drying steam inlet of the drying chamber. The low-temperature liquid inlet is communicated with a cold water source. During the low electricity consumption period, start the electric heating tubes of the heat accumulator, and the heat storage medium in the heat accumulator housing enters the heat storage state. When the high electricity consumption period arrives, turn off the electric heating tubes of the heat accumulator, and the heat storage medium in the heat accumulator housing enters the heat release state. It enters the first heat exchanger from the high-temperature heat storage medium outlet through the high-temperature heat storage medium inlet of the first heat exchanger, exchanges heat with cold water and then returns to the heat accumulator. The steam formed in the first heat exchanger enters the drying cavity through the high-temperature steam outlet of the heat exchanger and the drying steam inlet of the drying chamber to dry the tinplate products in the drying cavity. The tinplate energy-saving and environmental protection treatment system further includes a combustion chamber connected to the painting chamber. Among them, the painting chamber includes: a painting chamber, a product to be painted inlet provided on one side of the painting chamber, a painted product outlet provided on the other side of the painting chamber, a transmission device connected to the product to be painted inlet and the painted product outlet, and several VOC organic waste gas discharge outlets provided on the top wall of the painting chamber. The product to be painted inlet is connected to the tinplate product outlet of the drying chamber. The combustion chamber includes: a combustion chamber, a VOC organic waste gas inlet, an auxiliary combustion gas inlet, and a flue gas outlet provided on one side of the combustion chamber. The VOC organic waste gas inlet is connected to the VOC organic waste gas discharge outlet of the painting chamber through a pipeline. The auxiliary combustion gas inlet is connected to an air source. The flue gas outlet is connected to a chimney. Among them, the high-temperature heat storage medium inlet of the first heat exchanger is connected to the high-temperature heat storage medium outlet of the heat accumulator through a first heat storage pipeline. The low-temperature heat storage medium outlet of the first heat exchanger is connected to the low-temperature heat storage medium inlet of the heat accumulator through a second heat storage pipeline. A heat storage valve and a pipe pump are respectively provided on the first heat storage pipeline and the second heat storage pipeline.

2. The tinplate energy-saving and environmental protection treatment system according to claim 1, characterized in that, A waste heat boiler is further provided between the combustion chamber and the chimney. The waste heat boiler is provided with a high-temperature flue gas inlet, a low-temperature flue gas outlet, a cold water inlet, and a steam outlet. The high-temperature flue gas inlet is communicated with the flue gas outlet of the combustion chamber, the low-temperature flue gas outlet is communicated with the chimney, the steam outlet is communicated with the drying steam inlet of the drying chamber, and the cold water inlet is communicated with a cold water source.

3. The tinplate energy-saving and environmental protection treatment system according to claim 2, characterized in that, The condensate outlet of the drying chamber is communicated with the low-temperature liquid inlet of the first heat exchanger.

4. The tinplate energy-saving and environmental protection treatment system according to claim 2, characterized in that, A partition is provided in the middle of the heat storage tank housing of the heat storage tank to divide the heat storage tank housing into an upper part and a lower part. The high-temperature heat storage medium outlet and the low-temperature heat storage medium inlet are arranged in the upper part of the heat storage tank housing. A high-temperature heat transfer oil outlet and a low-temperature heat transfer oil inlet are respectively provided in the lower part of the heat storage tank housing. A coiled heat transfer oil pipeline placed among the heat storage media is connected between the high-temperature heat transfer oil outlet and the low-temperature heat transfer oil inlet.

5. The tinplate energy-saving and environmental protection treatment system according to claim 4, characterized in that, It further includes a second heat exchanger. The second heat exchanger is provided with a high-temperature heat transfer oil inlet, a low-temperature heat transfer oil outlet, a high-temperature gas outlet, and a low-temperature gas inlet. The high-temperature heat transfer oil inlet is communicated with the high-temperature heat transfer oil outlet of the heat storage tank, and the low-temperature heat transfer oil outlet is communicated with the low-temperature heat transfer oil inlet of the heat storage tank.

6. The tinplate energy-saving and environmental protection treatment system according to claim 5, characterized in that, A preheating chamber is further provided between the drying chamber and the painting chamber. The preheating chamber includes: a preheating chamber, a preheating inlet provided on one side of the preheating chamber, a preheating outlet provided on the other side of the preheating chamber, a plurality of drying gas inlets provided on one end wall of the preheating chamber, and a drying gas outlet provided on the other end wall of the preheating chamber. The drying gas inlets are communicated with the high-temperature gas outlet of the second heat exchanger through pipelines.

7. The tinplate energy-saving and environmental protection treatment system according to claim 6, characterized in that, The drying gas outlet of the preheating chamber is communicated with the combustion-supporting gas inlet of the combustion chamber.

8. The tinplate energy-saving and environmental protection treatment system according to any one of claims 1 to 7, characterized in that, The heat storage medium is nitrate.

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