Production of microwave devices for industrial. Industrial application of microwave heating

Description
Industrial microwave WSZ is a tunnel type of sterilizers. Typically, heat transfer occurs as follows: the surface of the equipment transfers heat to the surface of the material, which further transfers heat to inner part material. Heat conduction occurred with the help of convection or a radiated wave. This method always had a negative factor, slow to achieve desired temperature for sterilization. Microwave units radiate in such a way as to respond directly and quickly to existing bacteria in the material. The thermal and non-thermal effects are both effective in this case, thus reducing the processing time. The sterilization process, depending on the properties of the material, usually lasts 3-5 minutes. The sterilization temperature in the chamber varies from 70℃ to 90℃.

Application
This equipment is used to sterilize and dry the following types of materials: spices, food additives, protein powder, meat products, seafood, fruits, legumes, vegetables, mushrooms, wheat, starch, compound feed and so on, spreading to a wide variety of industries, including food, pharmaceutical, agricultural.

Peculiarities
1. It has automatic temperature control system, microwave density control system, heating time control system, alarm system, and video surveillance system.
2. Small space occupancy, instantaneous heating rate, even heat transfer, good maneuverability and controllability, easy operation, energy saving and low cost.
3.Transformer can be with various types cooling, including water, air and self-cooled. Able to work 24 hours in a row, continuously.
4. Leak rate complies with national and American UL quality standards.

Specifications industrial microwave installation

Model	WSZ-1	WSZ-2	WSZ-3	WSZ-4
Frequency (MHz)	2450+150MHz
Power, kWt)	9 kW, customizable	12 kW, customizable	24 kW, customizable	48 kW, customizable
Drying process (kg/kW.h)	1 kg/kW.h
Conveyor width (mm)	450	450	450	450
Conveyor speed (rpm)	0.4-6	0.4-7	0.4-10	0.4-15
Power (kW)	< 15	< 20	< 40	< 80
Dimensions (mm)	6000×800×1500	8000×800×1500	10000×800×1500	16000×800×1500

Yangzhou Yutong Drying Equipment Co., Ltd is a manufacturer and supplier of industrial microwave equipment in China. In addition, we also supply mixing, granulating equipment, extractors and concentrators. The enterprises received a credit rating of “AAA” from Jiangsu International Credit Assessment Company. Our industrial microwave units have long been trusted by manufacturing companies.

A professional microwave oven has a number of significant differences from household appliances, and this should be taken into account when deciding to buy a microwave oven for a restaurant or cafe. It is important to understand that a household appliance is not designed for long and frequent cycles of work, does not have sufficient power to solve professional and industrial problems, and does not always meet the stringent hygiene requirements applicable to. Let's pay attention to a number of the most important parameters of professional microwave ovens for public catering.

• The power of the magnetron in such models can be very high, reaching up to 3 kilowatts, and this reduces the heating time by up to 40 - 60% compared to a household stove. So, it will take no more than 9 seconds to bring a hot sandwich to serving temperature, for a cheeseburger - about 20 seconds.
• Increased power makes it possible to evenly process the workpiece, prevent the appearance of dry edges, unheated middle - this is essential to reduce rejects.
• Working space a professional microwave oven is usually large, the volume of the chamber can reach up to 35 liters, and this is a serious application for mass production in catering. There is no rotating plate element in the working chamber, which only takes up space in terms of professional use.
• The duration of the working cycle can reach up to 60 minutes, the number of cycles per day is limited not to five or six inclusions, but to hundreds. At the same time, the electronic programmer is capable of operating in a variety of complex modes, and the operator can set complex sequences of operations for the device.
• The internal space of the working chamber is made of stainless steel, which meets the hygienic standards for catering establishments.

The principle of operation and types of professional microwave ovens

The principle of operation of a professional microwave oven is based on the resonance that occurs in current-conducting molecules when they enter the region of microwave electromagnetic radiation. This determines the most important feature of this method of heating - surface heating. Unlike traditional methods of heat treatment of products for cooking, heating occurs not due to the influx of heat from the outside, but directly inside the surface layer.

Some features of the physics of this process and the misconceptions associated with it should be taken into account. Electromagnetic induction leads to the appearance of current only on the surface of the conductor, which means that the active process of resonance and heating occurs at a shallow depth, and the statement “the microwave heats the product from the inside” is deeply erroneous. It would be more correct to say that the product heats up itself, and not under the influence of external source heat. The heat propagates from the surface layer inwards.

The heating efficiency depends on the presence of water molecules in the product. A wet surface layer will warm up faster. Therefore, when defrosting a large piece of meat, its edges may begin to “cook”. Drops of fat in the working chamber can become active conductors of current, and this will lead to the appearance of a superconducting plasma that looks like sparks and a blue glow in a microwave oven, and ultimately to a breakdown of the magnetron.

A professional microwave oven allows you to regulate the heating process not due to pauses in the operation of the magnetron (like a household electric stove with frequent on and off), but due to the use of an inverter in the design - it changes the power of the radiation itself. For professional cooking, this is very important, because it gives a real opportunity to control the process of cooking, defrosting or heating food.

These physical features are the main difference between microwave processes and millennial methods traditional for cooking. That is why manufacturers of microwave ovens began to expand their functionality and integrate into their products various devices for traditional methods cooking. The result of such developments was the emergence of complex devices with additional functions.

• The convection microwave oven supplies hot air to the working chamber, thus allowing you to cook traditional dishes using the baking method, as in.
• The microwave oven with a grill is equipped with heating elements for work in a commercial kitchen - frying meat and fish using direct heat, as in professional grills. Heating elements can be located at different points of the working chamber.
• Microwave ovens with a programmer are the most powerful devices that work for a long time with a built-in microprocessor. They perform many functions, they are able to independently carry out the entire cycle from defrosting to complete cooking of the dish and signal the completion of the process. As a rule, a display is installed on such equipment for full information and control. Furnaces of this type are designed for a three-phase connection, due to which they provide an output power of up to 3 kilowatts, while working with two magnetrons on microprocessor commands.
• Industrial microwave ovens - they are not used in the restaurant business, but exist as a class of equipment for various industries, including mechanical engineering.

It offers to buy professional microwave ovens - in our catalog you will find devices with various parameters and capabilities, from a simple device for heating ready-made meals in a cafe to a high-power oven with a full range of built-in functions, convection, grill, program control.

Microwave ovens and thermal equipment for restaurants from "RestoranKomplekt"

For the convenience of customers, we have developed our own logistics scheme - equipment can be received at or picked up as soon as possible from. If there is no equipment for your order in the regional warehouse, we will deliver from Moscow at our own expense.

The professional microwave ovens offered by us for catering have full set. Performed on site if necessary. At your disposal a range of professional microwave ovens for catering

• SIRMAN
• AIRHOT
• MERRYCHEF
• SAMSUNG
• BECKERS
• MENUMASTER
• HURAKAN

With chamber volume from 17 to 35 liters and power up to 3 kilowatts.

Which is better: an infrared dryer for wood or a microwave analogue? To understand, you need to understand how they work, as well as compare the main indicators. What are we going to do.

Wood is a hygroscopic material that contains moisture and is able to absorb it from the outside. There are two types of lumber on sale: having natural moisture and dried. The latter are more expensive, as they are ready for use immediately after purchase. Therefore, many sawmill owners are interested in purchasing wood dewatering equipment.

The market offers several options for wood drying installations. Today we will look at infrared dryers and microwave installations, we will understand the principle and parameters of their operation, we will decide how to organize the production process using them. Having detailed information about different types equipment, it will be much easier to decide which one will be optimal for a particular production.

Principle of operation

Infrared dryers suggest drying the wood by heating it with infrared rays. This method does not require the use of a coolant, the organization of a ventilation system and the presence of complex control automation. Drying does not lead to the occurrence of internal stresses and warping of the tree. It is possible to change the drying mode depending on the quality of the source material.

The principle of operation of the microwave dryer similar to a microwave oven. Drying occurs under the influence of microwave radiation: the moisture in the wood heats up and boils, the excess pressure created by hot steam squeezes it out. Excess moisture is removed by reversible fans.
The attenuation mode of the microwave wave makes it possible to regulate the drying temperature.

Appearance

Infrared dryers are a set of thermoactive cassettes, only 1.5 mm thick. These cassettes are stacked in a certain sequence in a pile of lumber prepared for drying.


microwave dryers have the form of a closed metal container, in most cases equipped with a mechanized electric trolley for more comfortable room stacks of lumber inside the structure. Additionally, a control unit is installed.

Size and weight

One of the main advantages of infrared dryers is their portability. Standard thermoset cassette has a size of 1230 x 650 x 1.5 mm and a weight of 5.7 kg, which makes it easy to transport the entire set of wood drying equipment in the trunk of a car. The weight of a set of 12 cassettes is 69 kg, and in the crate, together with the shield and cabling, it does not exceed 130 kg.

microwave installation has a much larger size and weight. So, the chamber, designed for drying 6-9 cubic meters of lumber, has a length of more than 6 meters, a width of 1 meter and a height of about 2 meters. At the same time, its weight is 9 tons, and the area required for installing the equipment is 3x17 m. To transport the microwave installation from place to place, you will need to use special equipment.

Autonomy of work

infrared dryer completely autonomous, with correct installation and connection, you do not need to constantly monitor the drying process.

microwave installation, in which the dehydration of the material is carried out by high frequency currents (915-2500 MHz), requires regular monitoring of the operator in order to avoid ignition of the wood inside the chamber.

Drying time

Naturally, the drying time of lumber depends on their moisture content. original condition and types of wood.

Via infrared thermal cassettes any type of wood can be dried. Drying time to 8% moisture content of pine is 3-7 days. The thinner the boards and the higher the moisture content to achieve, the shorter the drying time.

Regarding microwave dryers It is known that the INVESTSTROY SHF-LES installation is capable of drying a pine beam 200x200 mm with a moisture content of 50-70% to 18% in 22 hours (after the material has cooled, the moisture index decreases to 10.2%).

Source of power

infrared cassettes work from an ordinary household power supply network of 220 V.

For work microwave dryer 380V, 50Hz power supply required.

Power and electricity consumption

Maximum plant power from infrared cassettes: 3.3 kW/m³. Electricity consumption during drying of 1 m³ of wood: 100-400 kWh.

Average power consumption microwave installations: 58 kW, and the specific energy consumption for the drying process is 200-230 kWh / m³.

Price

One of the most significant indicators when purchasing new equipment for work is its market value.

The prices for FlexiHIT infrared dryers are very democratic:

• equipment for drying 1 m³ of a three-meter board will cost 59,288 rubles;
• equipment for drying 1 m³ of a four-meter board will cost 69,329 rubles;
• equipment for drying 1 m³ of a six-meter board - 70,007 rubles.

Moreover, the prices are indicated for the entire set of equipment, which contains 12 thermoactive cassettes, a control panel, cabling and a crate.

In Russia microwave installations, as noted above, is produced by INVESTSTROY. Such a dryer costs from 1,300,000 rubles. In addition, when planning its acquisition, you need to take into account that the magnetron (a device that generates microwaves) is consumable. It will need to be replaced at least once a year. The cost of the magnetron is 150,000 rubles.

findings

It should be noted that both variants of the considered dryers are new technologies, but already successfully used in our country.

Doubtless convenience of infrared equipment is the possibility of its use both indoors and outdoors. outdoors, mobility and low price. Such equipment can be used in production and at home. The ease of installation allows you to fully assemble the dryer within one day, and if necessary, quickly disassemble it and transport it to another place. At the same time, the drying quality meets the most stringent requirements.


The advantage of microwave installation to is the ability to quickly dry thick beams and logs with a diameter of up to one meter. Their use is justified in production, where it comes to preparing for further use large workpieces. But with a less impressive scale, this technology is practically inaccessible due to the high cost and overall dimensions.

Industrial microwave ovens used in public catering establishments for rapid heating, as well as cooking and defrosting various products and ready meals using high-frequency current electromagnetic field. Industrial microwave ovens operate in the following modes:

• microwave,
• convection,
• grill.

In addition, they can be combined for a more varied preparation of common dishes. Today, mechanical, electronic, as well as electromechanical control of microwave ovens is used.

As for the differences between professional and household equipment, in general, professional ovens are similar to household ones, but they cook, reheat and defrost food much faster and in large quantities. That is why most entrepreneurs try to buy branded food equipment, and not be content with much less productive household counterparts.

In addition, industrial microwave ovens are more reliable and durable than domestic ones. They are able to withstand intensive use, that is, they can work continuously for a long time. Often they are equipped additional programs, and almost always have a larger volume of the inner chamber.

Another one distinguishing feature professional microwave ovens from household ones - ultra-reliable shielding. It is for this reason that such furnaces practically do not emit harmful electromagnetic waves. The door mechanism has a reinforced structure, and the professional microwave ovens themselves are built very rationally, which makes it possible to use the working volume of the chamber most efficiently.

microwaves do not belong to necessary equipment for professional kitchens, since they are not so actively involved in the cooking process. But recently, professional microwave ovens are increasingly being used in bars, restaurants and fast food establishments, which are characterized by high traffic.

Such equipment is already absolutely indispensable for restaurants and cafes, which offer full meals. Industrial microwave ovens work successfully in large kitchen shops of hotels and airports.

Professional furnaces, like any other similar equipment, are characterized by increased wear resistance and high performance. They are designed for really tough operation, and in almost round the clock. The quality of such equipment is ensured by an extremely careful selection of structural materials with excellent properties. operational characteristics. Also, a great advantage of professional ovens is the greater mobility of heating and defrosting dishes, which becomes an indispensable quality when you need to increase the throughput of a certain catering establishment.

Compared to other professional equipment, the advantage of microwave ovens is the economy in power consumption, since most models operate on a single-phase current network and bring products to readiness in very a short time. Most microwave ovens are made of stainless steel, lined with plastic or the same stainless steel on the outside. The inner chamber is made without seams, which greatly facilitates its care.

Microwave installation for drying bulk materials.
Our company specializes in the development, design, engineering and testing of equipment in order to obtain a reliable and high-quality product for drying and heat treatment of bulk materials. Sample with maximum power 2 kW (power adjustable by software) and water-cooled has successfully proven itself in technological process. Can be used in various industries.

Microwave heating and its application:
Technological processing of a wide variety of objects almost always includes heat treatment and, first of all, heating or drying. With traditional methods of heating and drying (convective, radiation and contact), the object is heated over the surface. If the thermal conductivity of the object is low, which is the case with dielectrics, then the heat treatment of the object occurs slowly, with local overheating of the heating surface, which may cause the surface to burn, causing internal mechanical stresses. All this can ultimately lead to the failure of the object.
Microwave is the heating of an object by the energy of an electromagnetic field of microwave frequencies. An electromagnetic wave, penetrating into an object, interacts with charged particles. The combination of such microscopic processes leads to the absorption of the field energy in the object. Full description effect can only be obtained with the help of quantum theory. Let us limit ourselves to taking into account the macroscopic properties of the material medium described by classical physics.
Depending on the location of the charges in them, the molecules of the dielectric medium can be polar and non-polar. In some molecules, the arrangement of charges is so symmetrical that in the absence of an external electric field their electric dipole moment is zero. Polar molecules have some electric dipole moment even in the absence of an external field. When an external electric field is applied, non-polar molecules are polarized, that is, the symmetry of the arrangement of their charges is violated, and the molecule acquires a certain electric moment. Under the action of an external field, polar molecules not only change the magnitude of the electric moment, but also turn the axis of the molecule in the direction of the field. A distinction is usually made between electronic, ionic, dipole, and structural polarizations of a dielectric. In microwaves, dipole and structural polarizations have the largest specific weight, so that heat release is possible even in the absence of conduction current.

Microwave devices for technological purposes operate at frequencies established by international agreements. For heat treatment in the microwave range, electromagnetic oscillations at frequencies of 433, 915, 2375 (2450) MHz are most often used.
The table gives information about the depth of penetration of an electromagnetic wave into some of the lossy dielectrics.

Depth of penetration of an electromagnetic wave In a dielectric with losses at 20-25Co

dielectrics	penetration depth, mm
	433 MHz			915 MHz		375 MHz
barium titanium	11,3			3,5		0,6
methyl alcohol	33,0			7,8		1,4
water	70,5			23,4		3,5
glass	4600			2180		840

So, if instead of traditional methods of heating, heating is used using the energy of microwave oscillations, then due to the penetration of the wave into the depth of the object, this energy is converted into heat not on the surface, but in its volume, and therefore it is possible to achieve a more intense increase in temperature with greater uniformity. heating compared to traditional heating methods. The latter circumstance in some cases leads to an improvement in the quality of the product. Microwave heat treatment has a number of other advantages. Thus, the absence of a traditional coolant ensures the sterility of the process and the inertia of heating control. By changing the frequency, it is possible to achieve heating of various components of the object. Microwave electrothermal installations occupy an area smaller than similar installations with a traditional energy drive, and have less harmful effects on environment at best conditions labor of service personnel. Microwave installations and their working chambers.

For any purpose of the microwave electrothermal installation, it has a block diagram shown in Figure 1.

A prototype of a microwave oven manufactured for Polysorb LLC

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