Heat recovery system of pop-top can baking finish workshop

Abstract

The utility model provides a heat recovery system of a ring-pull can baking finish workshop, and belongs to the technical field of ring-pull can production. Comprising a heating furnace, a drying oven and a circulating gas pipe located in the heating furnace, the gas outlet end of the circulating gas pipe is connected with the head end of the drying oven, and the gas inlet end of the circulating gas pipe is connected with the tail end of the drying oven through a return pipe. The device has the advantages of low energy consumption and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of can production and relates to a heat recovery system for a can baking paint workshop. Background Art

[0002] After the cans are painted, they enter the oven to dry the paint film. In the existing technology, the heating furnace heats the circulating air pipe, and the heated hot air flow is sent to the head end of the oven. After passing through the heating section, insulation section and cooling section of the oven, this part of the gas is directly sent to the exhaust gas treatment system, and the air inlet end of the circulating air pipe in the heating furnace continuously inhales the air in the workshop. In this cycle, the air in the workshop serves as the gas source for the heating furnace, is heated and sent into the oven, and then discharged to the exhaust gas treatment. This method has the following defects: 1. The temperature of the exhaust gas discharged from the end of the oven is between 50 and 70°C, and it is directly discharged to the exhaust gas treatment system, resulting in a large amount of heat energy waste; 2. There is a certain amount of metal dust and gas dust in the air in the paint workshop. The metal dust is fine and difficult to filter out. The presence of metal dust is very easy to adhere to the surface of the undried cans in the oven, affecting the appearance of the product. Utility Model Content

[0003] The purpose of this utility model is to provide a heat recovery system for a can paint shop in order to solve the above problems in the existing technology. The technical problem to be solved by this utility model is how to improve the heat utilization rate, save energy and reduce emissions.

[0004] The purpose of the utility model can be achieved through the following technical solutions: a heat recovery system for a can paint shop, comprising a heating furnace, an oven and a circulating air pipe located in the heating furnace, the outlet end of the circulating air pipe being connected to the head end of the oven, and characterized in that the air inlet end of the circulating air pipe is connected to the end of the oven through a reflux pipe.

[0005] Furthermore, a filter is provided on the reflux pipe.

[0006] Furthermore, the return pipe is connected in parallel with a spare exhaust pipe located before the filter, and the return pipe is connected in parallel with a spare intake pipe located after the filter. An air valve is respectively provided on the spare intake pipe, spare exhaust pipe and return pipe.

[0007] This solution has the following advantages over the existing technology: 1. The temperature of the exhaust gas discharged from the end of the oven is between 50 and 70°C, and is sent into the circulation pipe. Compared with room temperature, the inlet temperature of the circulation pipe is increased, which greatly reduces the natural gas consumption of the heating furnace and achieves energy-saving effects; 2. There is a certain amount of metal dust and gas dust in the air in the paint shop. The metal dust is fine and difficult to filter out. The presence of metal dust is very easy to adhere to the surface of the undried cans in the oven, affecting the appearance of the product. This solution eliminates the interference of metal dust in the exhaust gas by recirculating the exhaust gas at the end of the oven. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a structural diagram of the heat recovery system in this can paint shop.

[0009] In the figure, 1. Heating furnace; 2. Oven; 3. Circulating air pipe; 4. Return pipe; 5. Filter; 6. Spare exhaust pipe; 7. Spare air inlet pipe; 8. Air valve. DETAILED DESCRIPTION

[0010] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0011] Heat recovery system in can paint shop, such as Figure 1 As shown, it includes a heating furnace 1, an oven 2 and a circulating air pipe 3 located in the heating furnace 1. The outlet end of the circulating air pipe 3 is connected to the head end of the oven 2, and the air inlet end of the circulating air pipe 3 is connected to the end of the oven 2 through a return pipe 4. A filter 5 is provided on the return pipe 4. The filter 5 is a physical filtration method, mainly filtering dust and adsorbing paint volatiles in the exhaust gas, without causing a significant cooling effect on the exhaust gas. Under normal working conditions, the conveyor belt feeds the cans to be painted from the head end of the oven 2, passing through the heating section, insulation section and cooling section of the oven 2 in sequence. The heating furnace 1 heats the air in the circulating air pipe 3, and after heating to the required temperature of the heating section, it is fed into the head end of the oven 2. The cans move smoothly in the oven 2, and the gas in the oven 2 is fed into the air inlet end of the circulating air pipe 3 through the return pipe 4 at the end of the oven 2. The exhaust gas temperature is used to reduce the energy consumption of the heating furnace 1, and at the same time, the adverse effect of metal dust on the paint film of the cans caused by the air originally entering the workshop is eliminated.

[0012] The return pipe 4 is connected in parallel with a spare exhaust pipe 6 located before the filter 5, and the return pipe 4 is connected in parallel with a spare intake pipe 7 located after the filter 5. An air valve 8 is provided on the spare intake pipe 7, the spare exhaust pipe 6 and the return pipe 4 respectively; when the filter 5 and other components need maintenance, the return pipe 4 can be closed, and the spare intake pipe 7 and the spare exhaust pipe 6 can be opened to temporarily switch to the traditional air flow circulation mode. According to needs, the spare intake pipe 7 can also be used simultaneously with the return pipe 4. At this time, the spare intake pipe 7 can be switched to other hot air sources, such as the clean hot air formed by exhaust gas treatment.

[0013] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

Claims

1. A heat recovery system for a can paint shop, comprising a heating furnace (1), an oven (2) and a circulating air pipe (3) located in the heating furnace (1), wherein the air outlet end of the circulating air pipe (3) is connected to the head end of the oven (2), and is characterized in that: The air inlet end of the circulating air pipe (3) is connected to the end of the oven (2) via a return pipe (4).

2. The heat recovery system for a can paint shop according to claim 1, characterized in that: A filter (5) is provided on the return pipe (4).

3. A heat recovery system for a can paint shop according to claim 1 or 2, characterized in that: The return pipe (4) is connected in parallel with a spare exhaust pipe (6) located before the filter (5), and the return pipe (4) is connected in parallel with a spare intake pipe (7) located after the filter (5). An air valve (8) is provided on each of the spare intake pipe (7), the spare exhaust pipe (6) and the return pipe (4).

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