Full preheated heat-curing method

Abstract

The application provides a full-preheating heating and curing method and relates to the technical field of material drying. The method divides a heating and curing kiln into a main chamber and a secondary chamber, sets a heating and curing system to supply heat to the main chamber, sets an auxiliary heating system to supply heat to the secondary chamber on the basis, provides auxiliary heat for the inside of the main chamber, and ensures that the materials in the main chamber are uniformly heated. The auxiliary heating system and the heating and curing system are independent of each other, the auxiliary heating system consumes much less energy than the heating and curing system, and mainly plays a role of heat compensation. The method is beneficial to keeping the temperature of the positions close to the hot air outlet and far from the hot air outlet in the main chamber consistent, reducing the phenomenon of uneven heating of the materials, and improving the yield of the materials in the heating and curing.

Description

Technical Field

[0001] This invention relates to the field of material drying technology, and in particular to a fully preheated heating curing method. Background Technology

[0002] Heat curing technology is widely used in the drying, curing, and shaping of materials. Among the many types of common heat curing kilns, one type works by heating cold air and introducing it into the kiln, raising the internal temperature and thus heating the materials inside. This type of heat curing kiln is generally used to cure non-metallic materials at high temperatures between 100 and 300 degrees Celsius, making the materials more robust and durable.

[0003] However, existing heating and curing kilns mostly use electricity, heat transfer oil, steam, etc., as the heat transfer medium. Furthermore, non-metallic materials release a large amount of moisture during the heating and curing process, resulting in a temperature and humidity imbalance where the temperature is high and humidity is low near the hot air inlet, and low and high humidity further away. Additionally, when there is too much material inside the kiln, uneven heating easily occurs. To ensure uniform heating, a large amount of heat is required, resulting in high moisture removal volume, high energy consumption, and long heating and curing times, increasing production costs. Moreover, this method has a high scrap rate due to uneven heating leading to failed curing and low production efficiency. Summary of the Invention

[0004] In view of this, the purpose of this invention is to provide a fully preheated heating and curing method to solve the above problems.

[0005] To achieve the above objectives, the present invention provides a fully preheated heating and curing method, which is carried out according to the following steps:

[0006] S1. Install a heating and curing kiln, and install baffles inside the heating and curing kiln to divide the inside of the heating and curing kiln into a main chamber and a secondary chamber.

[0007] S2. Install a heating and curing system on the heating and curing kiln, specifically: connect the main exhaust pipe to the top of the heating and curing kiln, and connect an auxiliary exhaust fan to the end of the main exhaust pipe; connect the main air inlet pipe to the bottom of the heating and curing kiln, and both the main air inlet pipe and the main exhaust pipe are connected to the main chamber; connect the main axial flow fan to the end of the main air inlet pipe, and install the main air valve and the main heating mechanism on the main air inlet pipe respectively.

[0008] S3. Install an auxiliary heating system on the heating and curing kiln, specifically: install a side heating pipe in the secondary chamber; connect an auxiliary dehumidification pipe to the top of the heating and curing kiln, and connect an auxiliary dehumidification fan to the end of the auxiliary dehumidification pipe; connect an auxiliary air inlet pipe to the bottom of the heating and curing kiln, and both the auxiliary air inlet pipe and the auxiliary dehumidification pipe are connected to the secondary chamber; connect an auxiliary axial flow fan to the end of the auxiliary air inlet pipe, and install an auxiliary air valve and an auxiliary heating mechanism on the auxiliary air inlet pipe respectively.

[0009] S4. Set the first temperature, second temperature and third temperature, and monitor the internal temperature of the heating and curing kiln.

[0010] S5. Open the main air valve and auxiliary air valve to their maximum opening, start the main axial flow fan, and then start the main heating mechanism.

[0011] S6. Once the internal temperature of the heating and curing kiln has stabilized, add the material into the main chamber and heat and cure it.

[0012] S7. Turn off the main exhaust fan until the internal temperature of the heating and curing kiln is higher than the first temperature, then turn on the main exhaust fan.

[0013] S8. When the internal temperature of the heating and curing kiln is lower than the second temperature, start the auxiliary axial flow fan, auxiliary heating mechanism and side heating pipe.

[0014] S9. After the material has been heated and cured, shut down the heating and curing system and control the auxiliary heating system to cool down the heating and curing kiln.

[0015] S10. When the internal temperature of the heating and curing kiln is lower than the third temperature, turn off the auxiliary heating system, remove the material from the heating and curing kiln, and repeat steps S4 to S10 to carry out the heating and curing treatment of the next batch of material.

[0016] Compared with existing technologies, the advantages of this invention are as follows: This invention divides the interior of the heating and curing kiln into a main chamber and a secondary chamber. A heating and curing system supplies heat to the main chamber, while an auxiliary heating system supplies heat to the secondary chamber, providing auxiliary heat to the main chamber and ensuring uniform heating of the material within the main chamber. The auxiliary heating system is independent of the heating and curing system, and its energy consumption is significantly lower, primarily serving a thermal compensation function. This method helps maintain consistent temperatures at the near and far hot air inlets within the main chamber, reducing uneven heating of the material and improving the yield of the cured material. This method features rapid material heating and short curing time, eliminating the need to increase the air intake at the hot air inlets to address uneven heating, thus saving significant energy and reducing production costs.

[0017] Furthermore, after S8, it also includes: increasing the speed of the auxiliary axial flow fan according to the number of main exhaust fans started, and increasing the temperature of the auxiliary heating mechanism and the side heating pipe.

[0018] Furthermore, the specific steps for controlling the auxiliary heating system in S9 to cool down the heating curing kiln are as follows: set the fourth temperature; turn off the auxiliary heating mechanism until the internal temperature of the heating curing kiln is lower than the fourth temperature, and then turn off the auxiliary exhaust fan and the auxiliary axial flow fan.

[0019] Furthermore, the auxiliary heating mechanism and the main heating mechanism are each composed of several sets of electric heating tubes. Attached Figure Description

[0020] Figure 1 A front view of a heating and curing kiln for a fully preheated heating and curing method provided in an embodiment of the present invention;

[0021] Figure 2 A side view of a heating curing kiln for a fully preheated heating curing method provided in an embodiment of the present invention;

[0022] Figure 3 A top view of a heating curing kiln for a fully preheated heating curing method provided in an embodiment of the present invention;

[0023] Figure 4 A cross-sectional view of a heating curing kiln for a fully preheated heating curing method provided in an embodiment of the present invention.

[0024] The following are labeled in the diagram: 1. Heating and curing kiln; 2. Baffle; 3. Main chamber; 4. Secondary chamber; 5. Auxiliary air inlet pipe; 6. Auxiliary axial flow fan; 7. Auxiliary air valve; 8. Auxiliary heating mechanism; 9. Side heating pipe; 10. Auxiliary dehumidification pipe; 11. Main air inlet pipe; 12. Main axial flow fan; 13. Main air valve; 14. Main heating mechanism; 15. Main dehumidification pipe; 16. Insulation board; 17. Inlet and outlet; 18. Electric heating pipe; 19. Material; 20. Main dehumidification fan; 21. Auxiliary dehumidification fan. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0026] like Figures 1 to 4 As shown, the present invention proposes a fully preheated heating and curing method, which is carried out according to the following steps:

[0027] S1. Install a heating and curing kiln 1. The outer wall of the heating and curing kiln 1 is covered with insulation board 16, and the heating and curing kiln 1 has inlet and outlet ports 17. Install baffles 2 inside the heating and curing kiln 1 to divide the interior of the heating and curing kiln 1 into a main chamber 3 and a secondary chamber 4. The secondary chamber 4 surrounds the main chamber 3, that is, the secondary chamber 4 is located on both sides and above the main chamber 3.

[0028] S2. Install a heating and curing system on the heating and curing kiln 1. In this embodiment, two heating and curing systems are set up. Specifically, a main exhaust pipe 15 is connected to the top of the heating and curing kiln 1, and an auxiliary exhaust fan 21 is connected to the end of the main exhaust pipe 15. A main air inlet pipe 11 is connected to the bottom of the heating and curing kiln 1. Both the main air inlet pipe 11 and the main exhaust pipe 15 are connected to the main chamber 3. A main axial flow fan 12 is connected to the end of the main air inlet pipe 11, and a main air valve 13 and a main heating mechanism 14 are installed on the main air inlet pipe 11. The main air valve 13 is located between the main axial flow fan 12 and the main heating mechanism 14. The main heating mechanism 14 consists of several sets of electric heating tubes 18.

[0029] S3. An auxiliary heating system is installed on the heating and curing kiln 1. In this embodiment, two auxiliary heating systems are set up. Specifically, the auxiliary air inlet pipe 5 consists of a main pipe and branch pipes. One end of the main pipe is connected to the auxiliary axial flow fan 6, and the other end of the main pipe is connected to several branch pipes. The ends of the branch pipes are connected to the bottom of the heating and curing kiln 1 and are connected to the secondary chamber 4. By setting several branch pipes, the heated gas can enter the secondary chamber 4 more evenly. An auxiliary air valve 7 and an auxiliary heating mechanism 8 are installed on the main pipe. The auxiliary air valve 7 is located between the auxiliary axial flow fan 6 and the auxiliary heating mechanism 8. The auxiliary heating mechanism 8 consists of several sets of electric heating tubes 18. Several side heating tubes 9 are set in the secondary chamber 4. The side heating tubes 9 are set vertically, and their two ends are connected to the top and bottom of the secondary chamber 4, respectively. The auxiliary dehumidification pipe 10 is connected to the top of the heating and curing kiln 1 and is connected to the secondary chamber 4. The end of the auxiliary dehumidification pipe 10 is connected to the auxiliary dehumidification fan 21.

[0030] S4. Set the first temperature, second temperature, third temperature and fourth temperature, and monitor the internal temperature of the heating and curing kiln 1.

[0031] S5. Open each main air valve 13 and auxiliary air valve 7 to the maximum opening, start the main axial flow fan 12, and then start the main heating mechanism 14.

[0032] S6. After the internal temperature of the heating and curing kiln 1 stabilizes, the material 19 is added into the main chamber 3 through the inlet and outlet 17 to start heating and curing the material 19.

[0033] S7. Turn off the main exhaust fan 20 to allow the material 19 to heat up rapidly. Once the internal temperature of the heating and curing kiln 1 exceeds the first temperature, turn on the main exhaust fan 20 to remove moisture.

[0034] S8. During dehumidification, the temperature inside the heating and curing kiln 1 drops. When the internal temperature of the heating and curing kiln 1 is lower than the second temperature, the auxiliary axial flow fan 6, the auxiliary heating mechanism 8, and the side heating pipe 9 are started to allow hot air to circulate in the secondary chamber 4, providing auxiliary heating.

[0035] When the dehumidification volume of the heating and curing kiln 1 is large, that is, when too many main dehumidification fans 20 are started, the speed of the auxiliary axial flow fan 6 is increased to increase the air volume, and the temperature of the auxiliary heating mechanism 8 and the side heating pipe 9 is increased to increase the heat radiation of the auxiliary heating system to the main chamber 3, so as to ensure that the heating and curing effect is not affected during the dehumidification process.

[0036] S9. After material 19 has been heated and cured, the heating and curing system is shut down. The auxiliary heating system is then controlled to cool the heating and curing kiln 1. Specifically, the auxiliary heating mechanism 8 is shut down, while the auxiliary axial flow fan 6 remains operational to begin cooling the heating and curing kiln 1. Once the internal temperature of the heating and curing kiln 1 is below the fourth temperature, the auxiliary exhaust fan 21 and the auxiliary axial flow fan 6 are shut down.

[0037] S10. When the internal temperature of the heating and curing kiln 1 is lower than the third temperature, turn off the auxiliary heating system, remove the material 19 from the heating and curing kiln 1, and repeat steps S4 to S10 to carry out the heating and curing treatment of the next batch of material 19.

[0038] The main function of the heating and curing system is to heat the outside air and introduce it into the heating and curing kiln 1 to heat and cure the material 19 inside the kiln 1, while simultaneously expelling the large amount of moisture generated by the material 19 from the kiln 1. This part is the main heat exchange device in the heating and curing process. To ensure the heating and curing effect, this part consumes a large amount of energy, accounting for 80% of the total power of the heating and curing kiln 1.

[0039] The main function of the auxiliary heating system is to provide heat to the top and sides of the heating and curing kiln 1 through heated air, ensuring a consistent temperature throughout the kiln and acting as a heat compensation mechanism. The baffle 2 is made of metal and has good thermal conductivity; therefore, the heat generated by the side heating pipes 9 can be promptly radiated into the main chamber 3, providing timely heat to its interior. This part has low heat loss, resulting in low energy consumption and relatively low power consumption, accounting for only 15% of the total power of the heating and curing kiln 1.

[0040] The embodiments of this invention are intended to cover all such substitutions, modifications, and variations falling within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A fully preheated heating and curing method, characterized in that, Follow these steps: S1. Install a heating and curing kiln, and install baffles inside the heating and curing kiln to divide the inside of the heating and curing kiln into a main chamber and a secondary chamber; S2. Install a heating and curing system on the heating and curing kiln, specifically: connect the main exhaust pipe to the top of the heating and curing kiln, and connect an auxiliary exhaust fan to the end of the main exhaust pipe; connect the main air inlet pipe to the bottom of the heating and curing kiln, and both the main air inlet pipe and the main exhaust pipe are connected to the main chamber; connect the main axial flow fan to the end of the main air inlet pipe, and install the main air valve and the main heating mechanism on the main air inlet pipe respectively; S3. Install an auxiliary heating system on the heating and curing kiln, specifically: install a side heating pipe in the secondary chamber; connect an auxiliary dehumidification pipe to the top of the heating and curing kiln, and connect an auxiliary dehumidification fan to the end of the auxiliary dehumidification pipe; connect an auxiliary air inlet pipe to the bottom of the heating and curing kiln, and both the auxiliary air inlet pipe and the auxiliary dehumidification pipe are connected to the secondary chamber; connect an auxiliary axial flow fan to the end of the auxiliary air inlet pipe, and install an auxiliary air valve and an auxiliary heating mechanism on the auxiliary air inlet pipe respectively; S4. Set the first temperature, the second temperature, and the third temperature, and monitor the internal temperature of the heating and curing kiln; S5. Open the main air valve and auxiliary air valve to their maximum opening, start the main axial flow fan, and then start the main heating mechanism; S6. After the internal temperature of the heating and curing kiln stabilizes, add the material into the main chamber and heat and cure the material. S7. Turn off the main exhaust fan until the internal temperature of the heating and curing kiln is higher than the first temperature, then turn on the main exhaust fan. S8. When the internal temperature of the heating and curing kiln is lower than the second temperature, start the auxiliary axial flow fan, auxiliary heating mechanism and side heating pipe; S9. After the material has been heated and cured, shut down the heating and curing system and control the auxiliary heating system to cool down the heating and curing kiln. S10. When the internal temperature of the heating and curing kiln is lower than the third temperature, turn off the auxiliary heating system, remove the material from the heating and curing kiln, and repeat steps S4 to S10 to carry out the heating and curing treatment of the next batch of material. The specific steps for controlling the auxiliary heating system in S9 to cool down the heating and curing kiln are as follows: Set the fourth temperature; Turn off the auxiliary heating mechanism until the internal temperature of the heating and curing kiln is lower than the fourth temperature, then turn off the auxiliary dehumidifying fan and the auxiliary axial flow fan.

2. The fully preheated heating and curing method according to claim 1, characterized in that, Following S8, the following also applies: adjusting the speed of the auxiliary axial flow fan according to the number of main exhaust fans started, and adjusting the temperature of the auxiliary heating mechanism and the side heating pipe.

3. The fully preheated heating and curing method according to claim 1, characterized in that, The auxiliary heating mechanism and the main heating mechanism are each composed of several sets of electric heating tubes.

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