1300°C Single-Tube Horizontal Purification Furnace

Equipment Composition

Basic requirements

Furnace body structure

1. The furnace shell has good temperature resistance and will not deform due to high temperature during long-term use. It is easy to clean, and the color matching is reasonable and beautiful. There is no bubbling or paint dripping.

2. The transmission components are fully protected to avoid safety risks, and the electrical protection is complete;

3. The furnace shell structure is reasonable, avoiding long-term overheating of local components ( electrical components, hinges, clips, etc. ) and affecting service life;

4. The furnace door opening should take into account the ease of operation, and be designed as a flip-top furnace body. The opening angle of the furnace door should facilitate the insertion and removal of the quartz tube; and the sealing performance should be improved as much as possible to prevent uneven temperature field.

5. An observation mirror is installed on the furnace body to observe the rotation of the quartz tube inside;

Gas control system

1. The right end of the furnace core tube is equipped with an air inlet pipe; the furnace tube opening is equipped with an exhaust hood to prevent gas leakage.

2. No vacuum is required inside the pipe; equipped with a flow meter to control the flow rate of each gas; the inlet flow rate setting range is 1~30L/min;

3. Equipped with pressure protection to prevent blockage of the gas outlet and excessive pressure inside the furnace tube.

4. Equipped with a gas leak alarm system to prevent gas leaks;

5. An iron frame is welded to the outside of the furnace to fix the vent pipe.

Furnace structure

1. The furnace lining is made of vacuum-formed high-purity alumina lightweight material. The parts that are prone to material handling (furnace opening and furnace bottom ) are made of lightweight hollow spherical alumina plates. It has high operating temperature, low heat storage, resistance to rapid heating and cooling, no cracking, no slag shedding, and good heat preservation performance.

2. Three layers of insulation are used: aluminum silicate fiberboard, alumina fiberboard, and alumina (polycrystalline) fiberboard.

Two silicon carbide rollers are inserted inside the furnace .

4. The thickness of the insulation material should be carefully considered to avoid heat leakage problems;

Furnace tube and roller structure

1. The furnace tube is a quartz tube with a cap; see the drawings for dimensions.

2. The rollers are made of silicon carbide, with retaining rings welded to both sides or with a variable diameter, to fix the furnace tube and prevent it from moving left and right in the rotating furnace tube. See the drawings for the dimensions. The silicon carbide rollers need to be purchased and assembled by the equipment supplier.

3. The quartz tube is a high-temperature resistant sand-turning tube, which can meet the powder turning effect and prevent the powder from sticking and clumping;

4. The quartz tube is placed inside a silicon carbide / silicon nitride composite tube to prevent the quartz tube from softening at high temperatures.

deformation.

Rotary transmission structure

1. The furnace body has a rotary transmission structure on one side, driving two silicon carbide rollers to rotate (both silicon carbide rollers are active) . The silicon carbide rollers, under pressure, drive the internal quartz tube to rotate. The transmission method must ensure that the radial force on the silicon carbide rollers is small to avoid cracking due to radial force, which would affect the operation of the furnace.

Use lifespan;

2. The motor is equipped with a variable frequency motor, 1-5 r/min The variable frequency motor is adjustable and can be set to rotate in both forward and reverse directions;

control system

1. Temperature control technology can preserve 5 Each process contains 30 or more steps. Temperature settings at the intermediate and higher levels can be edited online;

2. The temperature control system has continuous PID control. Adjustment, thermocouple failure alarm, over-temperature alarm, equipment real-time alarm

It features functions such as power display, temperature compensation setting, real-time temperature monitoring, temperature curve recording, and historical data export.

3. The control panel can be either touchscreen or keyboard and mouse-based;

4. Set automatic power consumption calculation to automatically calculate the power consumption for each furnace cycle;

Refractory materials

1. The furnace lining is made of vacuum-formed high-purity alumina lightweight material. Areas prone to material handling (furnace opening, furnace bottom) utilize lightweight hollow alumina plates, providing high operating temperatures and excellent heat storage.

Small, resistant to rapid heating and cooling, does not crack, does not shed slag, and has good thermal insulation properties.

thermal insulation materials

1. Three layers of insulation are used: aluminum silicate fiberboard, alumina fiberboard, and alumina (multi-layer) insulation.

Crystal fiberboard has an energy-saving effect of more than 80% compared to old-fashioned electric furnaces .

Furnace shell temperature

Protect

1. It adopts an integrated modular control unit, ensuring accurate control precision. It features dual-loop control and dual-loop protection, providing protection against overshoot, over-adjustment, under-adjustment, thermocouple interruption, phase loss, overvoltage, and overcurrent.

Over-temperature protection, current feedback protection, soft start protection, etc.

control

1. Employing closed-loop technology with thyristor module trigger control, using phase-shift trigger control or zero-crossing triggering, the output voltage, current, or power is continuously adjustable, exhibiting constant voltage, constant current, or constant power characteristics. The current loop is the inner loop, and the voltage loop is the outer loop. When a sudden load is applied or the load current exceeds the current limit, the output current of the voltage regulator is limited to the rated current range, ensuring normal operation of the output and the voltage regulator. Simultaneously, the voltage loop also participates in regulation, limiting the output current of the voltage regulator to the rated current range, maintaining constant output current and voltage with sufficient adjustment margin. This protects the heating elements from excessive current and voltage.

Impact, to achieve safe and reliable control effect and control accuracy.

Display parameters

1. Temperature, temperature range number, time period, remaining time, output power percentage, voltage, electrical...

Flow, etc.

Button

Temperature profile setting

1. Employing an intelligent temperature controller, it offers multiple adjustment modes including standard PID , AI-based APID , and MPT. It features self-tuning and self-learning capabilities, excellent control characteristics with no overshoot or undershoot, and 30- segment programmable control. It can achieve arbitrary slope temperature rise and fall control, and includes programmable / operable commands such as jump (loop), run, pause, and stop. The program can be modified at any time during operation. It also incorporates curve fitting functionality.

The artificial intelligence adjustment algorithm can achieve a smooth and even curve control effect;

Heating and temperature control system

1. Meets the long-term operating temperature of 1250℃ , with a maximum operating temperature of 1300 ℃. The process cycle is intermittent: room temperature heating → constant temperature for 2~8 hours → cooling to room temperature.

2. The heating rate is freely adjustable, with an adjustment range of: maximum heating rate of 10 rpm. Temperature, slowest heating rate 1 degree per hour Degree ( 1 (degrees /h )

3.3​ For one or more temperature zones, the length of each temperature zone must ensure that the furnace tube uniform temperature zone is at least 1.3m long. At or above, the temperature field uniformity within the constant temperature stage is ±5℃ , and the temperature control accuracy is ±1℃ .

4. The furnace heating elements use silicon carbide rods, arranged in parallel around the perimeter or top and bottom, with wiring on one side for easy installation and replacement;

5. The temperature control system uses a silicon controlled rectifier (SCR) voltage regulation method for temperature control;

6. Temperature measuring thermocouples use S A graduated thermocouple, with a separate thermocouple, can be used to intermittently measure the temperature of the uniform temperature zone inside the quartz tube during the constant temperature stage and to calibrate the temperature compensation value.

other

1. Equipment installation requirements ( including water, electricity, gas, ground, etc.) provided with the equipment . 1 copy of the certificate of conformity , 1 copy of the equipment instruction manual One copy of the instruction manual , one copy of the electrical diagram (electrical schematic diagram, input and output terminals, terminals must be labeled ) CAD​ Assembly drawing 1 List of consumable and easily damaged parts (including price ) 1 1 copy, maintenance manual 1 copy of the standard parts brand and model list , 1 copy of the delivery list Each piece of equipment comes with a test report from the factory.

2. The electrical cabinet components are equipped with fans for cooling and heat dissipation. The wiring is arranged with normal density and spacing. Flying wires and loose wires are prohibited. The cable trays are fixed.

3. One crucible tong and one pair of high-temperature gloves are provided with the equipment;

Serial Number

Main components

Brand/Manufacturer

Remark

1.

Main electrical components

Item

Schneider Electric, Siemens

2.

touchscreen

Siemens

3.

PLC

Siemens S7-1200

4.

thermocouple

Chongqing Dazheng or equivalent

5.

Temperature control module

Xiamen Yudian, Japan's Shimadzu Corporation or equivalent

6.

Refractory insulation materials

/

7.

Furnace body outer shell

/

8.

Power regulator

Sichuan Yingjie