Vertical Fire Testing Furnace

TESTech Instrument (Suzhou) Technologies is one of the leading manufacturers and suppliers of vertical fire testing furnace in China. Welcome to wholesale premium test equipment at competitive price from our factory. If you have any enquiry about quotation, please feel free to email us.

 

 

The vertical fire testing furnace mainly consists of the furnace body, combustion system, control system, and exhaust system. The foundation of the test furnace and the specimen loading device are not included.

 

The fire resistance test system uses a vertical furnace with an internal chamber size of 3000 mm in length, 3000 mm in height, and 1500 mm in depth.

 

The furnace is intended for fire resistance testing of single-sided wall assemblies, various doors, and rolling shutters.

The vertical furnace is composed of a fixed furnace body section.

 

 

For ISO 834, GB/T 9978-1999, and BS 476, the furnace temperature-time curve follows the formula: T - T0 = 345 lg (8t + 1), where T is the average furnace air temperature after heating time t, T0 is the initial furnace air temperature, and t is the heating time in minutes.

For ASTM E119, the furnace air temperature rise process follows the tabulated temperature schedule provided in the source material.

The hydrocarbon fire temperature rise curve follows ASTM E1529 / UL 1709 as referenced in the source material.

 

 

• During the test, the deviation between the actual average furnace temperature and the target temperature-time curve shall satisfy the following requirements: when 0 min < t <= 10 min, d <= 15%; when 10 min < t <= 30 min, d <= 10%; when t > 30 min, d <= 5%.
• In the formula, A is the area under the actual average furnace temperature-time curve, As is the area under the target furnace temperature-time curve, and t is the heating time.
• The detailed comparison table between target furnace temperature curve and actual furnace temperature curve is retained in the original technical source.

 

 

• According to GB/T 9978-1999 for vertical components, positive pressure shall be maintained above the upper two-thirds of specimen height.
• At furnace height of 3 m and 100 mm from the specimen surface, the pressure shall be 20 +/- 5 Pa.
• Maximum possible burning duration per test: 240 min.
• Observation ports: one 200 mm x 200 mm observation port on each of three sides of the vertical furnace.
• Outer wall surface temperature requirement during the test: less than or equal to 45 degrees C plus ambient temperature.
• Fan room noise, combustion noise, exhaust temperature, gas emission, and all other indices shall comply with relevant national standards.
• Where technical parameters are not specified, GB/T 9978-1999 shall apply.
• Interfaces of the combustion control and data acquisition system can be switched for future use with similar furnaces. All exposed components of the furnace shall receive suitable protective coating for corrosion resistance and appearance.

 

 

Furnace Chamber Dimensions	3000 x 3000 x 1500 mm (L x H x D)
Maximum Heated Specimen Size	3000 x 3000 mm
Maximum Furnace Temperature	1150 degrees C
Maximum Heating Duration Per Test	240 min
Observation Ports	Three sides, one phi200 mm observation port on each side
Data Acquisition Channels	8 furnace air temperature channels, 40 specimen temperature channels, 12 displacement and strain channels, 8 load channels
Fuel Type	Liquefied petroleum gas, calorific value 4.18 x 23200 KJ/m3
Maximum LPG Consumption	175 kg/h (87.5 m3/h)
Maximum Air Consumption	2275 m3/h
Working Mode	Intermittent operation, each heating cycle not exceeding 3 hours

 

 

After all equipment of the vertical fire resistance test furnace completes cold commissioning successfully and the furnace baking process is finished, the structural specimen is lifted into place, the component and the four edges of the furnace roof are soft-sealed, and all test devices are installed.

 

When ignition is initiated, all burners are automatically ignited through the computer or front-furnace control. The furnace temperature then follows the required temperature-time curve automatically, and the furnace temperature is automatically adjusted across eight control zones.

 

Relevant operation is carried out according to the safety operating procedure, user manual, and control system operating procedure for the vertical fire resistance test furnace.

 

 

Furnace Body Structure

• The furnace wall steel plate thickness is 6 mm, and the outside of the furnace is reinforced with No. 16 I-beams.
• The whole vertical fire resistance test furnace adopts a full refractory fiber structure.
• Eight high-speed temperature-regulating burners are installed on the two side walls of the furnace in vertical arrangement and horizontal installation.
• The exhaust system is positioned opposite the specimen side of the furnace.
• An induced exhaust method is used, and the induced-draft fan uses a variable-frequency motor for precise furnace pressure control.
• Three observation ports are installed on three sides of the furnace, with phi200 mm circular structure, internal thermal shield, and external high-temperature quartz glass sealing.

 

Combustion System

• Eight high-speed liquefied petroleum gas temperature-regulating burners are installed on the two side walls of the vertical furnace.
• Each burner plate has one phi20 hole for observing flame combustion status.
• Each burner has automatic electric ignition and flame monitoring.
• When furnace temperature is above 650 degrees C, extinguished burners can reignite automatically because liquefied petroleum gas will ignite when encountering high temperature.
• Advanced pulse combustion control technology is used to change heat load by adjusting large and small burner flames.
• Each control zone thermocouple signal is compared with the set value and processed by the computer, which outputs signals to the PLC combustion control system using Siemens S7-300 PLC.
• The PLC drives the electric actuators of liquefied petroleum gas and air valves for each burner, thereby controlling the heat input in each zone according to the process curve.
• The air-fuel ratio can be preset and modified by the computer for energy saving, consumption reduction, and environmental protection.
• Each burner is equipped with a high-voltage ignition transformer, ignition electrode, and flame detector. If a burner flames out due to failure, the LPG supply to that burner is automatically cut off and an alarm is triggered.
• LPG, Air, and Flue Gas Pipeline System
• The workshop LPG main header is phi60 x 3.5, with maximum flow Q = 87.5 m3/h and pressure about 12000 Pa before entering the workshop main header.
• The workshop LPG main header is equipped with manual shut-off valve, quick shut-off valve, pressure regulating valve, vent valve, and sampling point.
• Cold air pressure is regulated by the variable-frequency motor of the blower, with maximum air flow Q = 2275 m3/h.
• The air pipeline is equipped with an explosion relief system.
• Total flue gas flow is 2400 m3/h, chimney outlet gas speed is 4 m/s, and outlet flue gas temperature is about 250 degrees C.
• The chimney is made of heat-resistant steel plate, total height 10 to 12 m, with 100 mm refractory fiber insulation layer in the section from the flue to the chimney.
• Flue gas discharge is completed by the induced-draft fan.

 

Control System

• The system uses Siemens PLC and Advantech industrial computer from Taiwan to form an advanced, practical, and reliable automatic regulation and control system.
• Process variables collected by field instruments are sent to the PLC, which drives the corresponding actuators according to the set control mode and target value, thereby regulating temperature, pressure, flow, air-fuel ratio, and load.
• Operators can set thermal parameters through keyboard or mouse using the industrial computer human-machine interface, and the computer performs automatic regulation according to the set parameters.
• Process data such as flow, pressure, temperature, air-fuel ratio, and load are processed and displayed on the computer, while historical data and production reports can be retrieved and printed.
• The sound and light alarm system provides timely alarm for faults and misoperation and gives operators handling guidance.
• The computer can automatically track the heating curve, dynamically display large and small flames of each burner, display operation of blower and induced-draft fan, and record displacement and pressure sensor values into corresponding curves.
• The furnace may optionally be equipped with two high-temperature camera systems to dynamically monitor changes inside the furnace and on the specimen during the test.

 

High-Temperature Industrial Television Monitoring System

• The high-temperature industrial television system integrates electromechanical, microelectronic, cooling, and software technologies.
• The camera lens can be directly extended into the furnace below 2000 degrees C for continuous real-time monitoring of combustion status and flame shape.
• The electrical control system uses Mitsubishi PLC to improve operability and reliability.
• The system provides automatic protection. In case of overtemperature, gas failure, or power failure, the probe automatically retracts from the furnace for protection.
• The airflow design forms a vortex air curtain in front of the lens, increasing air curtain strength and purging area and reducing dust adhesion on the lens.
• The system can run continuously online with basic maintenance only.
• The design reserves four camera mounting positions with sealing devices for observation from different angles during different tests.
• Main features include suitability for furnace wall thickness 300 to 400 mm, special air curtain design, sapphire high-temperature pinhole lens, stainless steel construction, wide viewing angle, PLC intelligent control, automatic retract protection, motor drive mechanism, pure air cooling without water cooling, and camera resolution of 650.

 

 

• PLC uses Siemens S7-300.
• Industrial computer uses Advantech industrial computer from Taiwan.
• Frequency inverter uses Fuji.
• Main low-voltage electrical components use Siemens, LG, or equivalent products.

 

 

• Automatic control items: eight-zone furnace temperature control, two-point furnace pressure control, combustion air pressure stabilization control, and LPG main header pressure control.
• Temperature detection items: eight furnace temperature points for detection, display, record, and control; 40 specimen temperature points for detection and display via data acquisition unit.
• Pressure measurement items: one LPG main header pressure point, one combustion air main header pressure point, and two furnace pressure points for detection, display, and record.
• Flow measurement item: one LPG main header flow point for detection, display, and accumulation.
• Displacement and strain measurement: 12 points for detection, display, and record, with sensors supplied by the customer.
• Load measurement: eight points for detection, display, and record, with hydraulic system and pressure sensors supplied by the customer.

 

 

• Alarm for incorrect parameter setting.
• Automatic sound and light alarm for overtemperature in any of the eight furnace zones.
• Automatic sound and light alarm for excessive high or low furnace pressure.
• Automatic sound and light alarm for low combustion air main header pressure; when below the lower limit, the LPG main header is quickly cut off.
• Automatic sound and light alarm for low LPG main header pressure; when below the lower limit, the LPG main header is quickly cut off.
• Each burner is equipped with ignition transformer, ignition electrode, and flame detector. If the burner flames out due to failure, the emergency shut-off solenoid valve automatically cuts off the LPG pipeline and an alarm is given.
• Furnace pressure control is achieved by adjusting the variable-frequency motor of the induced-draft fan at the flue gas inlet under the chimney.
• Air pressure control is achieved by adjusting the frequency of the combustion fan to stabilize combustion air pressure.
• LPG pressure control is achieved by adjusting the pressure regulating valve on the LPG main header to stabilize LPG supply pressure.

 

 

• Main operating control points provide manual, semi-automatic, and automatic control modes.
• The electrical control room consists of one main power control cabinet including inverter control, one main cabinet, and one operating console with one display screen.

Air Pressure	6000 Pa
LPG Main Header Pressure Before Furnace	12000 Pa
Burner Type and Quantity	8 high-speed temperature-regulating burners with automatic ignition and flame monitoring
LPG Pressure Before Burner	5000 Pa
Air Pressure Before Burner	5000 Pa
Loading / Unloading Method	Overhead crane lifting for heated workpieces

 

 

• JB/T5000.3-98 General technical requirements for welded parts.
• JB/T5000.9-98 General technical requirements for machined parts.
• JB/T5000.8-98 General technical requirements for forgings.
• JB/T5000.4 to 6-1998 General technical requirements for castings.
• JB/T5000.12-98 Coating technical requirements.
• JB/T5000.13-98 Packaging technical requirements.
• TJ36-79 Industrial enterprise design hygiene standard.
• YB9239-92 Quality inspection and evaluation standard for installation of metallurgical electrical equipment.
• GB93-86 Construction and acceptance code for industrial automation instrument engineering.
• GB50168-92 Construction and acceptance code for cable line installation engineering.
• GBJ131-90 Quality inspection and evaluation standard for installation of metallurgical mechanical equipment.
• GB1236-82 Construction and acceptance code for welding engineering of field equipment and industrial pipelines.
• GBJ211-87 Construction and acceptance code for industrial furnace masonry engineering.
• GBJ300-88 Quality inspection and evaluation standard for building installation engineering.
• YB9249-93 Construction and acceptance code for installation of metallurgical mechanical equipment.
• JBJ23-96 General code for installation and acceptance of mechanical equipment engineering.
• GB9078-1996B Atmospheric pollutant emission standard for industrial furnaces and kilns.
• GB50252-94 Unified standard for quality inspection and evaluation of industrial installation engineering.
• GBJ235-82 Construction and acceptance code for industrial pipeline engineering.
• GBJ236-82 Construction and acceptance code for welding engineering of field equipment and industrial pipelines.
• GB50184-93 Quality inspection and evaluation standard for industrial metal pipelines.
• GB50185-93 Quality inspection and evaluation standard for insulation engineering of industrial equipment and pipelines.
• GB50309-92 Quality inspection and evaluation standard for industrial furnace masonry engineering.
• GB50221-95 Quality inspection and evaluation standard for steel structure engineering.
• TJ231-75 Construction and acceptance code for equipment installation engineering.
• DBJ08-216-95 Steel structure fabrication process specification.
• GB50108-2001 Technical code for waterproofing of underground works.

 

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