Views: 281 Author: Kaylee Publish Time: 2023-10-10 Origin: Site
The high-frequency pulse known as a microwave causes water molecules to swing rapidly at a rate of 2.4 billion times per second. Their rubbing against one another produces a lot of heat, which helps speed up material drying. Following the absorption of microwave energy and its conversion to heat, the object's temperature rises, causing the water therein to evaporate, dehydrate, and eventually dry out. Proper regulation of the dehydration rate can facilitate the expansion and loosening of the material's structure during the drying process. To maintain the object in a baking state during this process, the heating temperature can also be adjusted and raised.
Since the direction of heat conduction and the direction of water diffusion are the same, microwave drying differs from conventional drying techniques. It has several advantages over conventional drying techniques, including a higher drying rate, reduced energy consumption, increased production efficiency, consistent drying, clean production, simple automated control, and better product quality. As a result, more and more attention is being paid to several drying-related sectors. The theory and practise of microwave drying technology were studied in great detail overseas as early as the 1960s, and more progress has been made in more recent years. In comparison to other countries, China's research on microwave drying technology started somewhat later and has lagged somewhat, but it has also produced positive outcomes and numerous research and application successes. The culinary, materials science, pharmaceutical, mineral mining, ceramic, laboratory analysis, wet natural rubber processing, and other industries in China have all made use of microwave drying technology.Practically every area of the national economy is involved in the drying process, which is essential to daily living and manufacturing. To make processing, use, shipping, and storage easier, some raw materials, semi-finished goods, and completed products must be dried in order to remove moisture or solvents. The mechanical, chemical, and heating (freezing) processes are the common techniques for drying. These techniques either have a big equipment footprint and high drying costs, or they have a modest processing capacity and poor drying speeds. Traditional drying technologies and dryers may not always be appropriate due to advancements in science and technology, which include the emergence of new products such as biological products, new materials (multiphase composite materials, nanomaterials, intelligent materials, biomedical materials, etc.), advanced ceramics, new advanced foods, and new pharmaceutical products. The food and agricultural product processing, light, and chemical materials sectors have all made extensive use of microwave drying technologies and microwave dryers, which have proven to offer several benefits. Without a doubt, microwave drying is a novel technology that satisfies the needs of emerging goods.
China entered the field of microwave drying technology application research somewhat late in comparison to other countries. The field of application research for microwave drying technology is very modest, with most of the advancements being done in the experimental or small-scale manufacturing stages. Theoretical studies on instantaneous mass and heat transfer in microwave drying are insufficient, and more study on composite microwave drying technology is required. It is still necessary to expand the development of tools and equipment that support microwave drying technology. Furthermore, there are still a lot of issues with scale, continuity, and automation that need to be resolved even if theoretical research on the use of microwave drying in natural rubber drying has advanced significantly. The effects of microwave drying on non-rubber components, rubber molecules, and product process performance require more investigation. These are the main areas of our upcoming study.
In order to heat materials, microwave energy is converted into thermal energy in the furnace cavity, which is a microwave resonant cavity. The industrial microwave oven is designed like a tunnel, and the materials run continually on the conveyor belt to heat the materials in the furnace chamber uniformly.
The primary purpose of the furnace door setting in industrial microwave ovens is to make it easier to clean the furnace chamber for hygienic reasons. Industrial microwave oven switching systems use a number of safety interlocking microswitch mechanisms to avoid microwave leakage. An improperly closed furnace door prevents the industrial microwave oven from operating. There cannot be a microwave leaking issue if the microwave oven is broken. An anti-flow groove structure is installed around the industrial microwave oven door to prevent microwaves from leaking out of the gap between the door and the cavity after the door is closed. Alternatively, a material that can absorb microwaves, like a silicone rubber door seal, can absorb a small amount of microwaves that may leak. Installed within the door, the anti flow slot is a specially formed slot structure whose purpose is to direct the microwave to reverse phase. Microwaves are prevented from leaking at the antiflow channel's entry by reverse reflected waves offsetting the microwaves.
Based on the idea of microwave radiation, the anti flow slot structure is a robust and trustworthy way to stop microwave leakage. The world's most sophisticated anti-flow groove structure and production method are currently only used by a select few businesses. When combined with the most recent advancements in multiple anti-microwave leakage technology, these methods raise the bar for microwave leakage control technology to an advanced worldwide standard.
The benefits of electrical circuits include ease of control, stability and safety, and ease of repair and maintenance. They save energy and are ecologically friendly, and they can adjust power to suit the requirements of various materials.
A microwave oven's magnetron, which produces and emits microwave energy, is its central component. A cathode voltage of roughly 3–4 V and a high pulsing DC anode voltage are needed for the magnetron. The magnetron receives an operating voltage that satisfies the aforementioned specifications from the industrial microwave power supply regulation.
For microwave ovens, there are typically two timing techniques: computer timing and mechanical timing. Choosing the designated working time is the primary function. The timer automatically shuts off the microwave oven's main circuit after the predetermined amount of time.
To achieve the purpose of altering the average output power of the microwave oven, the power distributor is used to control the average working time of the magnetron (i.e., the percentage of "working" and "stopping" time when the magnetron is intermittently functioning).
An essential safety feature of industrial microwave ovens is interlocking microswitches. The door opening button on the furnace door or the door opening button on the furnace door handle controls each of the device's several interlocking features. To stop the microwave oven from operating while the boiler door is not closed or opened, unplug the circuit.
One part used to keep an eye on a magnetron's or furnace chamber's operating temperature is a thermal circuit breaker. The thermal circuit breaker will instantly turn off the power supply, stopping the microwave oven's operation, when the working temperature rises above a predetermined point.
1. Using a special microwave source and its control technology, which guarantees that the system can operate steadily and continuously for an extended period of time, day and night, in a variety of difficult situations, with a magnetron's typical service life of ≥1 year;
2. Using an effective microwave transmission system that has been specially created in accordance with standards, feeding the materials uniformly to achieve uniform drying and successfully preventing the phenomena of the materials' localised high temperature;
3. A scientific chamber design is completed using an original mathematical model and the drying process requirements to guarantee the maximum dehydration efficiency and prevent the occurrence of undesirable phenomena like "hot spots," "sparking," "splashing," and "burning belts" inside the chamber;
Microwave leakage<2 mw/cm is guaranteed by a safe and dependable microwave shielding design, well exceeding national norms; When it comes to "high-quality, efficient, energy-saving, and environmentally friendly" features, microwave drying offers the following advantages over conventional drying techniques (such as hot air, steam, electric heating, etc.):
1. Ensure that materials dry evenly and without contamination while drastically lowering the drying temperature;
2. Typically, the drying speed is raised several times or more, leading to a notable boost in production efficiency;
3. The energy used for drying is often lowered by more than 50%;
4. Production is now proceeding in a safe and clean manner.