Waste heat utilization device for drying oven of coating machine and use method of waste heat utilization device

Abstract

The invention relates to the technical field of coating machine drying oven waste heat utilization, in particular to a coating machine drying oven waste heat utilization device and a using method, the coating machine drying oven waste heat utilization device comprises a waste heat utilization unit, a waste heat distribution unit and a coating machine, a drying oven of the coating machine is communicated with a heat exchanger of the waste heat utilization unit, and the heat exchanger is communicated with the waste heat distribution unit. A first waste heat distribution pipe of the waste heat distribution unit is communicated with a feeding port of the coating machine, and a second waste heat distribution pipe of the waste heat distribution unit is communicated with a discharging port of the coating machine. According to the coating machine drying oven waste heat utilization device and the using method, energy conservation and process optimization of the coating machine drying oven are achieved through the closed-loop design of waste heat recovery, heat exchange and directional distribution.

Description

Technical Field

[0001] The present invention relates to the technical field of waste heat utilization of coating machine ovens, and particularly to a waste heat utilization device and a usage method for coating machine ovens. Background Art

[0002] In the coating industry, a large amount of high-temperature waste heat is generated during the operation of coating machine ovens. Traditional processes usually directly discharge the waste heat to the outside, resulting in energy waste and environmental heat pollution. Existing waste heat recovery systems have the following problems: low heat utilization rate: the waste heat is only used in a single link (such as preheating some materials), and a systematic heat recycling is not formed; scattered layout: the waste heat recovery device is separated from the main body of the coating machine, the pipeline connection is complex, and the heat loss is significant; single function: it is impossible to control the temperatures of both the inlet and outlet of the coating machine simultaneously, and it is difficult to meet the heat requirements of the material pretreatment and cooling links in the coating process; insufficient heat insulation performance: the traditional pipeline is not heat-insulated, and a large amount of heat is lost during transmission, further reducing the recovery efficiency.

[0003] Therefore, there is an urgent need for a waste heat utilization device with a compact structure, high thermal efficiency and covering multiple links to solve the problems of energy waste, unreasonable layout and single function in the prior art. Summary of the Invention

[0004] The purpose of the present invention is to provide a waste heat utilization device and a usage method for coating machine ovens. Through a systematic closed-loop design of waste heat recovery - heat exchange - directional distribution, the present invention realizes energy conservation and process optimization of coating machine ovens and improves the waste heat utilization efficiency.

[0005] To achieve the above purpose, the present invention provides a waste heat utilization device for coating machine ovens, which includes a waste heat utilization unit, a waste heat distribution unit and a coating machine. The oven of the coating machine is communicated with a heat exchanger of the waste heat utilization unit, the heat exchanger is communicated with the waste heat distribution unit, a first waste heat distribution pipe of the waste heat distribution unit is communicated with the inlet of the coating machine, and a second waste heat distribution pipe of the waste heat distribution unit is communicated with the outlet of the coating machine.

[0006] Preferably, the waste heat utilization unit includes a mounting frame, a waste heat inlet pipe and a heat exchanger. One end of the waste heat inlet pipe is communicated with a waste heat fan at the outlet of the oven, and the other end is communicated with the waste gas inlet of the heat exchanger. The heat exchange outlet of the heat exchanger is communicated with a heat exchange tee.

[0007] Preferably, both the first waste heat distribution pipe and the second waste heat distribution pipe of the waste heat distribution unit are communicated with the heat exchange tee. The end of the first waste heat distribution pipe far from the heat exchange tee is communicated with the inlet of the coating machine, and the end of the second waste heat distribution pipe far from the heat exchange tee is communicated with the outlet of the coating machine.

[0008] Preferably, the waste gas outlet of the heat exchanger is communicated with a waste gas pipe, and the mounting frame of the heat exchanger is located on one side of the coating machine.

[0009] Preferably, heat insulation layers are wrapped around the waste gas pipe, the first waste heat distribution pipe, and the second waste heat distribution pipe.

[0010] Preferably, the waste gas pipe, the first waste heat distribution pipe, and the second waste heat distribution pipe are all located at the top of the coater.

[0011] A method for using a waste heat utilization device of a coater oven, using the above-mentioned waste heat utilization device of a coater oven, includes the following steps:

[0012] S1. Start the coater oven and dry the products entering through the feed inlet of the coater.

[0013] S2. Start the waste heat blower and send the waste hot air in the coater into the heat exchanger.

[0014] S3. The heat exchanger uses the heat of the waste hot air to heat the fresh air, and the heated preheated air enters the heat exchange three-way.

[0015] S4. The heat exchange three-way distributes the preheated air into the feed inlet and the discharge outlet of the coater through the first waste heat distribution pipe and the second waste heat distribution pipe respectively.

[0016] Preferably, in S2, the waste gas after heat exchange enters the waste gas pipe through the waste gas outlet.

[0017] Preferably, in S3, the air blower sends fresh air into the heat exchanger.

[0018] Therefore, by using the above-mentioned waste heat utilization device and method of a coater oven, the beneficial effects of the present invention are as follows:

[0019] 1. Through the systematic closed-loop design of waste heat recovery - heat exchange - directional distribution, the present invention realizes energy conservation and process optimization of the coater oven, and improves the waste heat utilization efficiency.

[0020] 2. Compared with the traditional direct emission process, the heat recovery rate of the device provided by the present invention is increased by about 30% - 50%, the energy consumption of the coater oven is reduced, and the energy saving rate can reach 20 - 40%.

[0021] 3. Through two-way temperature control, the coating process of the coater is optimized. Preheating the feed inlet of the coater reduces the drying time, heating and heat preservation at the discharge outlet of the coater avoid temperature difference stress, and the uniform temperature distribution reduces coating defects and improves product quality.

[0022] The technical solutions of the present invention will be further described in detail below through the drawings and embodiments. Description of the Drawings

[0023] Figure 1 is a schematic diagram of a waste heat utilization device of a coater oven of the present invention;

[0024] Figure 2 It is a top view of a waste heat utilization device for a coating machine oven according to the present invention.

[0025] Reference numerals:

[0026] 1. Coating machine; 11. Coating machine feed inlet; 12. Coating machine discharge outlet; 13. Waste heat blower; 2. Heat exchanger; 3. Waste heat distribution unit; 31. First waste heat distribution pipe; 32. Second waste heat distribution pipe; 33. Heat exchange tee; 4. Air blower; 5. Mounting frame; 6. Exhaust pipe. Detailed implementation manners

[0027] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. Unless otherwise defined, the technical terms or scientific terms used in the present invention should have the ordinary meanings understood by those of ordinary skill in the field to which the present invention belongs. The above-mentioned features mentioned in the present invention or the features mentioned in the specific examples can be combined arbitrarily. These specific embodiments are only used to illustrate the present invention and do not limit the scope of the present invention.

[0028] Embodiment 1

[0029] As Figure 1 and Figure 2 shown, the present invention provides a waste heat utilization device for a coating machine oven, including a waste heat utilization unit, a waste heat distribution unit 3 and a coating machine 1. The oven of the coating machine 1 is communicated with the heat exchanger 2 of the waste heat utilization unit, and the heat exchanger 2 is communicated with the waste heat distribution unit 3. The first waste heat distribution pipe 31 of the waste heat distribution unit 3 is communicated with the coating machine feed inlet 11, and the second waste heat distribution pipe 32 of the waste heat distribution unit 3 is communicated with the coating machine discharge outlet 12.

[0030] The hot exhaust gas generated during the operation of the oven of the coating machine 1 is subjected to waste heat utilization through the heat exchanger 2, and the preheated air re-enters the coating machine 1 to form a heat cycle process. The present invention directly uses waste heat to preheat the coating machine feed inlet 11 and the coating machine discharge outlet 12, reduces the energy consumption required for heating the oven of the coating machine 1, balances the temperature distribution in the coating machine 1, and avoids coating quality problems caused by local temperature differences.

[0031] The waste heat utilization unit includes a mounting frame 5, a waste heat inlet pipe and a heat exchanger 2. One end of the waste heat inlet pipe is communicated with the waste heat blower 13 at the oven air outlet, and the other end is communicated with the exhaust gas inlet of the heat exchanger 2. The heat exchange exhaust gas outlet of the heat exchanger 2 is communicated with the heat exchange tee 33.

[0032] The waste heat blower 13 sends the hot waste gas in the oven into the heat exchanger 2. The hot waste gas exchanges heat with the fresh air in the heat exchanger 2. The waste gas and the fresh air flow in opposite directions, maximizing the temperature difference and improving the heat exchange efficiency. The preheated air obtained enters the waste heat distribution unit. The setting of the heat exchange three-way valve 33 flexibly adjusts the proportion of the preheated air at the coating machine inlet 11 and the coating machine outlet 12, adapting to different process requirements and improving the versatility of the equipment.

[0033] Both the first waste heat distribution pipe 31 and the second waste heat distribution pipe 32 of the waste heat distribution unit are connected to the heat exchange three-way valve 33. One end of the first waste heat distribution pipe 31 far from the heat exchange three-way valve 33 is connected to the coating machine inlet 11, and one end of the second waste heat distribution pipe 32 far from the heat exchange three-way valve 33 is connected to the coating machine outlet 12.

[0034] The first waste heat distribution pipe 31 conveys preheated air to the coating machine inlet 11 to preheat the cold material, reducing the temperature difference between the material and the oven of the coating machine 1 and reducing the energy consumption in the initial stage of drying. The second waste heat distribution pipe 32 conveys preheated air to the coating machine outlet 12 to maintain the temperature in the discharging area, evenly reducing the temperature and reducing stress concentration, preventing the product from shrinking and deforming due to too fast cooling.

[0035] The waste gas outlet of the heat exchanger 2 is connected to the waste gas pipe 6. The mounting frame 5 of the heat exchanger 2 is located on one side of the coating machine 1. The waste gas pipe 6, the first waste heat distribution pipe 31 and the second waste heat distribution pipe 32 are all arranged on the top of the coating machine 1, shortening the pipeline length and cooperating with the heat insulation layer to reduce the heat loss during transmission. The waste gas after heat exchange is discharged through the waste gas pipe 6. The setting of the position of the mounting frame 5 facilitates the separate maintenance of the heat exchanger 2.

[0036] The waste gas pipe 6, the first waste heat distribution pipe 31 and the second waste heat distribution pipe 32 are all wrapped with a heat insulation layer. The setting of the heat insulation layer further reduces the environmental heat exchange loss, reduces the heat loss of the waste gas pipe 6, the first waste heat distribution pipe 31 and the second waste heat distribution pipe 32, ensures that the preheated air reaches the target position at a higher temperature, and improves the actual effective heat utilization rate.

[0037] The waste gas pipe 6, the first waste heat distribution pipe 31 and the second waste heat distribution pipe 32 are all located on the top of the coating machine 1, utilizing the natural upward characteristic of hot air, avoiding occupying the ground space at the same time and being convenient for maintenance.

[0038] Embodiment 2

[0039] A method for using a waste heat utilization device for a coating machine oven, using a waste heat utilization device for a coating machine oven in Embodiment 1, including the following steps:

[0040] S1. Start the oven of the coating machine 1 and dry the product entering the coating machine inlet 11.

[0041] S2. Start the waste heat blower 13, send the waste hot air in the coater 1 into the heat exchanger 2, and the exhausted gas after heat exchange enters the exhaust pipe 6 through the exhaust gas outlet. The waste heat blower 13 actively extracts the exhausted gas to ensure the synchronous operation of the waste heat utilization device and the oven of the coater 1.

[0042] S3. The air blower 4 sends fresh air into the heat exchanger 2. The heat exchanger 2 uses the heat of the waste hot air to heat the fresh air, and the heated preheated air enters the heat exchange tee 33. By adjusting the rotation speed of the air blower 4, the flow rate and temperature of the preheated air are controlled.

[0043] Through the interlock control of the waste heat blower 13 and the air blower 4, the automated operation of waste heat recovery and preheated air supply is realized, reducing manual intervention.

[0044] S4. The heat exchange tee 33 sends the preheated air into the coater feed port 11 and the coater discharge port 12 through the first waste heat distribution pipe 31 and the second waste heat distribution pipe 32 respectively.

[0045] Therefore, the present invention adopts the above-mentioned waste heat utilization device and usage method for the coater oven. Through the systematic closed-loop design of waste heat recovery - heat exchange - directional distribution, the present invention realizes the energy conservation and process optimization of the coater oven, and improves the waste heat utilization efficiency.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that they can still modify or equivalently replace the technical solutions of the present invention, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A waste heat utilization device for a coater oven, characterized in that: It includes a waste heat utilization unit, a waste heat distribution unit and a coater. The oven of the coater is connected to the heat exchanger of the waste heat utilization unit. The heat exchanger is connected to the waste heat distribution unit. The first waste heat distribution pipe of the waste heat distribution unit is connected to the feed inlet of the coater, and the second waste heat distribution pipe of the waste heat distribution unit is connected to the discharge outlet of the coater.

2. The waste heat utilization device of a coater oven according to claim 1, wherein: The waste heat utilization unit includes a mounting frame, a waste heat inlet pipe and a heat exchanger. One end of the waste heat inlet pipe is connected to the waste heat fan at the outlet of the oven, and the other end is connected to the waste gas inlet of the heat exchanger. The heat exchange outlet of the heat exchanger is connected to a heat exchange tee.

3. The waste heat utilization device of a coater oven according to claim 2, characterized in that: Both the first waste heat distribution pipe and the second waste heat distribution pipe of the waste heat distribution unit are connected to the heat exchange tee. The end of the first waste heat distribution pipe away from the heat exchange tee is connected to the feed inlet of the coater, and the end of the second waste heat distribution pipe away from the heat exchange tee is connected to the discharge outlet of the coater.

4. The waste heat utilization device of a coater oven according to claim 1, characterized in that: The waste gas outlet of the heat exchanger is connected to a waste gas pipe, and the mounting frame of the heat exchanger is located on one side of the coater.

5. The waste heat utilization device of a coater oven according to claim 4, characterized in that: The waste gas pipe, the first waste heat distribution pipe and the second waste heat distribution pipe are all wrapped with a heat insulation layer.

6. The waste heat utilization device of a coater oven according to claim 4, characterized in that: The waste gas pipe, the first waste heat distribution pipe and the second waste heat distribution pipe are all located at the top of the coater.

7. A method for using a waste heat utilization device of a coater oven, characterized in that: When using a waste heat utilization device for the oven of a coater as described in any one of claims 1-6, the following steps are included: S1. Start the oven of the coater to dry the products entering through the feed inlet of the coater. S2. Start the waste heat fan to send the waste hot air in the coater into the heat exchanger. S3. The heat exchanger uses the heat of the waste hot air to heat the fresh air, and the heated preheated air enters the heat exchange tee. S4. The heat exchange tee sends the preheated air into the feed inlet and the discharge outlet of the coater through the first waste heat distribution pipe and the second waste heat distribution pipe respectively.

8. The usage method of a waste heat utilization device for a coater oven according to claim 1, characterized in that: In S2, the waste gas after heat exchange enters the waste gas pipe through the waste gas outlet.

9. The usage method of a waste heat utilization device for a coater oven according to claim 1, characterized in that: In S3, an air fan sends the fresh air into the heat exchanger.

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