What are the advantages and EAF what are the disadvantages

1) Compared with fuel stove is easy to get high.
2) can be heated to an internal temperature from the material.
3) facilitate the controlled atmosphere furnace and the vacuum furnace used.
4) no fuel furnace exhaust furnace heat loss, so high thermal efficiency.
5) is easy to control the temperature, to facilitate remote control and fine tune.
6) capable of rapid heating.
7) Operating performance is good, do not pollute the environment.
Furnace shortcomings
A) the need to increase distribution equipment costs.
2) high cost of electricity.
3) resistance when the heating temperature exceeds 1000 ℃, refractory materials may be electrically conductive, insulating problems need to pay attention.

Muffle furnace maintenance and repair

Be used again after the first time or long-term disabled muffle furnace, oven, furnace temperature of 200 ° C to 600 ° C for four hours is appropriate
2, long-term use muffle furnace temperature shall not exceed the maximum temperature.
3, muffle furnace and controller ambient temperature 0 to 50 ° C, relative humidity not more than 90% of the non-conductive dust, no explosive gas and corrosive gases in the workplace.
4, perfusion liquid and molten metal to muffle furnace hearth is prohibited.
Replacement muffle furnace wire, first remove the furnace chimney, open the furnace tailgate, remove the intermediate insulating brick stoves can be extracted for a good furnace wire, and then still installed
6 muffle furnace door lighter off light on, to prevent damage to the parts.
To extend the life of the muffle furnace and ensure safety after the end of the muffle furnace use should be promptly removed from the muffle furnace furnace samples, exit the heating and turn off the power.

The security technical operation of the box-type resistance furnace

1 used Do not exceed the maximum temperature of the resistance furnace.
2. Mounted specimens must cut off the power to prevent electric shock.
3 mounted specimens door open time should be as short as possible, in order to extend the service life of the electric furnace.
Prohibited any liquid perfusion to the furnace.
5 shall not be stained with water and oil sample into the furnace; clip mounted specimens shall be moistened with water and oil.
6 mounted specimens to wear gloves to put burns.
The sample should be placed in the middle of the furnace, neatly put away, do not misplacing.
Shall not casually touch furnaces and around the sample.
9 after use should be cut off power and water supply.
Without the permission of a resistance furnace shall not operate in strict accordance with the operating procedures of the equipment.

Compartment quick furnace

Compartment rapid heating furnace Products:
Do not Fragment furnace temperature uniformity throughout the large ingot heating periodic temperature regime (ie furnace temperature divided by the time the warm-up period, the heating period, the soaking period) two chamber furnace types: fixed-hearth chamber furnaces and car bottom furnace the fixed hearth room furnace hearth area generally 1 to 10 m 2. put on a material by manual or simple mechanical; chamber furnaces to heat a larger workpieces, put on a feeder with a special fuel for coal, heavy oil or gas to some furnace in the furnace wall to open a gap, the blank gap into the furnace heating called seam furnace, heating commonly used in small pieces or the long billet ends or local heating of this type of furnace hearth yield per unit area is usually 300 to 400 kg / (m 2 ·), specific heat consumption per ton of steel is about (1.0 to 1.5) × 106 kcal car bottom furnace for ingot weight of more than ten tons to hundreds of tons of heating before forging, furnace chamber or tunnel. heating objects placed in the trolley furnace loading and unloading by the workshop crane or other traction devices trolley pulled into or out of the furnace, the large ingot heating requirements furnace temperature evenly distributed, so the car bottom furnace normally distributed heating and dispersing smoke (burner and smoke crossing dispersed arranged on the side of the furnace wall).
Compartment rapid furnace work:
Stars chamber quick heating furnace heating chamber placed in a line by a certain compartment provided between the heating chamber and the heating chamber, the transfer roller of the preform is provided in the indoor blanks single (or double root) to which is heated by the heating chamber and the chamber between each heating chamber and adjacent compartments constitute a furnace section, so called furnace section. furnace for rapid heating, oxidation and decarburization applicable in heated circular blanks and steel pipe. compatible with the planetary mill, can be used to heat the continuous casting slab; localized heating of certain steel disadvantage is the low production capacity per unit length of the furnace, the lower the thermal efficiency of the furnace chamber The furnace used for heating before the metal billet or ingot forging does not move when the material is heated.

Industrial furnaces

Industrial furnace in the industrial production, the use of fuel combustion, or the heat energy into the workpiece material or the thermal heating device. Broadly speaking, the industrial furnace is a boiler, it is not customary to include it within the industrial furnace.The main components of industrial furnaces are: industrial furnace masonry, industrial furnace exhaust systems, industrial furnaces and industrial furnace combustion preheater devices. Machinery Industrial Applications There are many types of industrial furnaces in the foundry, there are metal smelting cupola, induction furnace, resistance furnace, electric arc furnace, vacuum furnace, open-hearth furnace, crucible furnace; has baked sand of the sand drying furnace, ferroalloy ovens and casting furnace and the like; in the forging workshop, the ingot or billet heating before forging various furnace, and stress relief heat treatment after forging furnace; the metal heat treatment plant, to improve the mechanical properties of the various annealing the workpiece , normalizing, quenching and tempering heat treatment furnace; in the welding workshop, weldments preheat furnace and post-weld tempering furnace; workshop in a sintered metal powder metallurgy furnace and so on.Industrial furnace is also widely applied to other industries, such as metallurgy industry, metal melting furnaces, ore sintering furnace and coke oven; distillation furnace oil industry and cracking furnace; gas industry furnace; portland cement kilns and industrial glass melting, glass furnace; oven food industry and so on.The creation and development of industrial furnaces for human progress plays a very important role. China appeared in the Shang Dynasty more perfect copper furnace, the furnace temperature reached 1200 ℃, furnace tubes of up to 0.8 meters. In the Spring and Autumn Period, people on the basis of melting copper furnace further improve temperature mastered the technology to produce cast iron.1794, the world has witnessed a straight-shaped cast iron melting cupola. After 1864, Frenchman Martin use the British Siemens regenerative furnace principle, the construction of gas fuel heating the first open-hearth steelmaking. He used the regenerators for air and gas preheat temperature, thus ensuring the required steel temperature above 1600 ℃. 1900, power supply gradually enough to start using a variety of resistance furnace, electric arc furnace and a coreless induction furnaces.1950s, coreless induction furnaces have developed rapidly. Later appeared electron beam furnace, using electron beam to the impact of solid fuel, can strengthen the surface heating and melting melting point of the material.First heating furnace for forging the hand forging furnace, its working space is a concave groove, the tank fill the coal, the combustion air fed into the lower portion of the slot, the workpiece is heated in buried in the coal. The thermal efficiency of the furnace is very low, the heating quality is not good, and only heating small parts, after the development of a refractory brick semi-closed or closed hearth furnace chamber can be coal, gas or oil as fuel , but also electricity as the heat source, the workpiece is placed inside the heating furnace.For heating large workpieces, there was great for heating ingots and billets bogie hearth furnace, for heating elongated rod member also appeared pit furnace. 1920s and later appeared to improve furnace productivity and improve working conditions for all kinds of mechanization and automation furnace.Industrial furnace fuel resource development along with the fuel and fuel switching technology, but by the use of lump coal, coke, coal and other solid fuels gradually switch furnace gas, city gas, natural gas, diesel, fuel oil and other gases and liquid fuel, and the production of the fuel used and adapted to various combustion devices.The structure of industrial furnaces, heating process, temperature control, and the furnace atmosphere, you will have a direct impact on the quality of the products after processing. In forging furnace, the heating temperature increase the metal, the deformation resistance can be reduced, but the temperature is too high will cause grain growth, oxidation or burnt, seriously affecting the quality of the workpiece. During the heat treatment, if the steel is heated to a point above the critical temperature, and then suddenly cooled, can improve the hardness and strength of steel; if heated to a point below the critical temperature and then slowly cooled, the hardness of the steel and can leaving lower toughness.In order to obtain accurate dimensions and surface finish of the workpiece, or in order to reduce the metal oxide in order to protect the mold, reducing the allowance purposes, you can use a variety of less or non-oxidizing furnace. No open flame in less oxidation furnace, the incomplete combustion of the fuel reducing gas generated in which the workpiece is heated oxidation loss rate can be reduced to 0.3%.Controlled atmosphere furnace using the artificial preparation of the atmosphere gas can be introduced into the furnace carburizing, carbonitriding, quenching, normalizing, annealing treatment: in order to change the microstructure, the purpose to improve the mechanical properties of the workpiece. Particles in the flow furnace, the fuel combustion gas, or externally applied to other fluidizing agents, forced flow of the furnace bed of graphite particles or other inert particle layer, the workpiece is embedded in the particle layer to achieve enhanced heat infiltration can also be carbon, nitrogen, and other non-oxidizing heating. In a salt bath furnace, a molten salt solution as a heating medium, to prevent oxidation of the workpiece and decarburization.In cupola furnace smelting iron, are often subject to coke quality, air supply, charge air temperature and other circumstances and conditions, the melting process is difficult to stable, easy access to quality hot metal. Hot air cupola can effectively improve the hot metal temperature, reducing alloy burning, reduce the rate of molten iron oxide, which can produce high quality cast iron.With the emergence of coreless induction furnaces, cupola has gradually been replaced by the trend. This induction furnace melting iron level work without any restrictions, to a hierarchy from the smelting of iron, quickly switch to another level of iron smelting, help to improve the quality of molten iron. Some special alloy steel, such as low carbon stainless steel and roll and the turbine rotor of the steel used, or a general need to be open hearth arc melting out of the molten steel in the vacuum refining furnace and argon in addition to miscellaneous stirred further refine the High purity, high-quality steel capacity.Industrial furnace by heating method is divided into two categories: one is the flame furnace (or called fuel stove), with a solid, liquid or gaseous fuel combustion in the furnace heat heating of the workpiece; second is the furnace, the furnace electrical energy is converted into heat for heating.Flame furnace fuel source wide, low price, ease of local conditions to take a different structure, help to reduce production costs, but the flame furnace difficult to achieve precise control of environmental pollution, low thermal efficiency. Furnace temperature uniformity and ease of features to achieve automatic control, heating and good quality. By way of energy conversion, electric furnace can be divided into resistance furnace, induction furnace and electric arc furnace.Industrial furnace by thermal system can be divided into two categories: one category is also known as cycle intermittent furnace furnace, which is characterized by intermittent production furnace, furnace temperature of each heating cycle is changing, such as the chamber furnace, Bogie hearth furnace, pit furnace, etc.; second is a continuous furnace, which is characterized by continuous production furnace, the furnace temperature zone division. During the heating process the temperature of each section is constant, the temperature of the workpiece from the preheating zone and gradually into the high temperature heating zone, such as the continuous heating furnace and heat treatment furnace, rotary furnace, furnace step, vibration Hearth Furnace and so on.In unit time and unit area of ​​the hearth furnace heating ability is called furnace productivity. Faster heating furnace, the furnace loading increases, the productivity of the furnace is higher. In general, the higher the productivity of the furnace, the heating unit of heat per kg of material consumption is also lower. Therefore, in order to reduce energy consumption, it should be at full capacity to maximize the productivity of the furnace, while the combustion of fuel and combustion air system to implement the automatic ratio adjustment, the amount of air in order to prevent excessive or inadequate. Also, to reduce heat loss and storage furnace wall, water-cooled heat loss components, all openings radiative heat loss, the heat removed from the flue gas losses.Heating the metal or materials absorb the heat and the heat supplied to the furnace, is known as furnace thermal efficiency. Than intermittent continuous furnace furnace thermal efficiency, since the production of a continuous furnace is high, and is uninterrupted, the furnace heat system in a stable state, there is no periodic regenerative furnace wall loss, but also because the furnace has an internal pre- hot charge section, some heat to the furnace gas inside a furnace charge preheating section into the furnace flue gas residual heat is absorbed by a cold work, reducing the temperature of the flue gas from the furnace.In order to achieve the required furnace temperature constant heating rate and, in addition must be based on process requirements, preheater and furnace mechanical type, fuel and combustion device class, industrial furnace exhaust methods to determine a good furnace structure, but also the need for fuel and combustion air flow and pressure, or other control variables on the electrical power control unit through a variety of mutual adjustment, to achieve the furnace, the furnace atmosphere or in the automatic control of the furnace pressure.

Laboratory chamber furnace

The lab box furnace in THERMCONCEPT in a variety of sizes, from 5 to rise to 45 liters (technical data see page 6), the internal specifications and maximum operating temperature of the furnace can be modified according to the needs of the laboratory. Available working voltage of 230V models. The movable bottom of the laboratory box furnace can also add the movable bottom plate can be easily replaced from the outside of the furnace. All maximum temperature of 1100 ° C / 1200 ° C / 1300 ° C in the box-type furnace can be used to move the base plate. Built-in air circulation laboratory chamber furnace with optional fan for internal air circulation, the air circulation system can improve the heat transfer of the heating element, which will help control the temperature and uniformity. This device is suitable for a maximum temperature of 1100 ° C the box-type furnace.
Laboratory box furnace parts:
By matching all kinds of accessories, we can according to your needs and functions best with a box furnace:
Exhaust chimney (with exhaust fan and with no exhaust fan).
2 exhaust stack, with exhaust fan and catalytic converters.
3 over-temperature protection regulator, according to the EN 60519-2 standard for thermal protection class 2 adjust the temperature.
4 mounted at the rear of the furnace protective gas connecting port.

Bell-type atmosphere sintering furnace

Bell-type atmosphere sintering furnace introduced
Bell atmosphere sintering furnace series device is the sintered ferrite core electronic materials such as special equipment, it is especially suitable sintering atmosphere in Mn-Zn high-grade soft magnetic ferrite materials, such as high permeability ferrite core , low-power ferrite core. The device summarizes our many years of practical experience, and director of public gambling house, with a high price. It has a compact structure, simple operation, high precision temperature control, low running cost, is a good choice of Mn-Zn ferrite.
Bell-type atmosphere sintering furnace uses
Bell atmosphere sintering furnace series device is the sintered ferrite core electronic materials such as special equipment, it is especially suitable sintering atmosphere in Mn-Zn high-grade soft magnetic ferrite materials, such as high permeability ferrite core , low-power ferrite core.
Bell-type atmosphere sintering furnace structure
All-fiber high-temperature furnace lining, bell-type atmosphere sintering furnace partition packet heating, circulation forced cooling, computer automatic control technology, with batch production, temperature and atmosphere good uniformity, high control precision, high product consistency, the operation the use of flexible superior characteristics. Especially suitable for the atmosphere of MnZn soft ferrite and low-power high-grade ferrite material ferrite sintering.
                  

Continuous aluminum bar heating furnace Features

1, furnace, furnace dimensions, depending on the aluminum rod model design;
2 forms of heating and heat transfer systems: heating form double combustion chamber of the gas (oil) heating; heat exchanger system: built-in duct, hot air circulation heat-resistant stainless steel fan, one;
Send rod form: heat-resistant steel chain drive to send rods;
, Steel and refractory materials: steel part: chassis, sprocket rack, chain rail 12 # channel steel tube the furnace frame with 60 * 40 rectangular, side panels with 2mm cold plate, door 8mm-A3 board; fire-resistant insulation materials: bottom brick lightweight insulation bricks, hot air is used in prefabricated custom-made semi-circular arch brick, tile using the new refractory furnace brick refractory standard bricks, cotton insulation with glass fiber cotton silicate;
5, the temperature control system: electrical parts Chint brand, with automatic heating, temperature control systems;
6, furnace heating: gas, fuel oil can be used.

Laboratory furnace

Laboratory heating furnace uses:
Laboratory furnace is mainly used in the use of the institutions of higher learning, research institutes, industrial and mining enterprises and other experiments and small batch production. Mainly used in electronic ceramic products calcined, sintering, coating, pyrolysis of low-temperature deposition (CVD) process.
Laboratory furnace features:
Laboratory furnace with high temperature ceramic or refractory bricks, Outside SECC steel, fine powder coating process.
The seal is made of aluminum plates.
Circular way: thermal radiation (three or four sides heated).
Heating method: PID + SSR or PID + SCR;
Heating material for high-temperature heating wire or silicon carbide;
Temperature range; room +20-1200; (Note: The temperature is adjustable)
Temperature controller: PID microcomputer control;
Timer: timer, thermostat function, temperature and time, the time to cut off the heating power;
Safety Protection: over-temperature protection, high temperature protection, over-current protection.
Can pass an inert gas (such as nitrogen);
Laboratory heating furnace structure:
Laboratory heating furnace temperature distribution in the furnace along the longitudinal direction is divided into a preheating section, heating section and a soaking zone; feed end of the lower furnace for preheating section, and its role is to use the heat of the furnace gas, in order to improve the thermal efficiency of the furnace . Heating as the main heating segment, the gas temperature is higher, in order to facilitate the rapid heating. Soaking zone is located in the discharge end, the gas temperature and metal material temperature difference is small, to ensure uniform temperature of the charge blank section. Stove for heating small cut fabric blank only warm-up and the heating section. Customary to also install the burner in the furnace for tropical divided furnace segment, in accordance for the number of tropical stove called the one-, two-stage, to five sections, Six-. 50 to 60 years, the mill capacity to increase the length of the pusher-type furnace is limited by the length of the Pusher not be too long, so start at the feed end of the increase for tropical canceled heating preheating section, in order to improve The productivity of the unit hearth area. This stove heated slab, bottom yield per unit area of ??900 to 1000 kg / (m 2 ·), the heat consumption of approximately (0.5 to 0.65) × 106 kcal / ton. Since the 1970s, due to energy needs, but also emerging stepping furnace allows to increase the length of the furnace, and additional heating preheating section, the best hearth yield per unit area of ??600 to 650 kg / (m 2 · Time), the heat consumption of approximately (0.3 to 0.5) × 106 kcal / ton.