CF8810A Small-scale Test Furnace for Fireproof Coating of Steel Structure
Overview:
The small-scale test furnace for fireproof coating of steel structures is suitable for the fire resistance performance tests of
various small samples of fireproof coatings for steel structures used indoors and outdoors of buildings (structures). It is not
applicable to samples with a length greater than 800 cm. It adopts the Windows 7 operating interface and the development software
LabView. The interface style is fresh, beautiful and simple. During the test, the measurement results are displayed in real time
and perfect curves are dynamically drawn. The data can be permanently saved, retrieved, printed and output, and the report can be
printed directly. It has the characteristics of high intelligence and guided menu operation, which is simple and intuitive, making
the test results more accurate.
It complies with the requirements of Chapter [missing chapter number] and Chapter 6 of GB/T 9978.1-2008 "Fire Resistance Test
Methods for Building Components - Part 1: General Requirements", the test standard of GB/T 14907-2018 "Fireproof Coatings for
Steel Structures", the standard requirements of GBJ 17-2003 "Code for Design of Steel Structures", GA/T 714-2007, and GB/T
9779-1988 "Multilayer Architectural Coatings".
Technical parameters:
1. Equipment Composition: Horizontal fire resistance test furnace, combustion control part, gas part and pressure reduction
system, pressure relief and pressure measurement system, flue gas emission system, sample test rack, gas flow system,
temperature measurement system (furnace temperature data acquisition system, test component temperature acquisition system),
smoke exhaust valve system and special test software.It adopts a 16-bit high-precision data acquisition module to collect data
in various aspects such as temperature, pressure and flow rate of each channel. After analysis, processing and control by a
microcomputer, it can generate real-time reproduced information of the combustion situation. And the results can be directly
obtained through the analysis and judgment of the microcomputer. All high-quality devices are used for the whole machine to
ensure the high quality and high-speed operation of the system, which is advanced.
2. Furnace Body Structure: It adopts a four-layer structure. When the temperature inside is 1300℃, the outer layer is at room
temperature. From the outside to the inside, they are respectively: The first layer is a stainless steel outer shell, the
second layer is a steel structure framework; the third layer is an outer enclosure built with high-temperature bricks; the
fourth layer is high-temperature ceramic wool capable of withstanding a temperature of 1700℃.
3. Burners:
3.1 Two sets of high-pressure burners with a power range of 60 to 80 kW are employed. These burners are equipped with air-fuel
ratio control, which forms a closed-loop control system in conjunction with the temperature feedback inside the furnace. They can
automatically adjust the gas valve and air valve to achieve the optimal combustion effect. To ensure safety, all the burner models
selected and their components are from renowned brands.
3.2 Combustion torch controller: It is equipped with an automatic alarm device for failed ignition and flame extinction.
3.3 There are 2 high-speed gas torches embedded on both sides of the furnace wall, with one on each side. They provide the heat
required for the temperature rise inside the furnace chamber.
3.4 Gas pipelines and air pipelines: They are composed of butterfly valves, air - fuel ratio valves, secondary pressure reducing
valves, manual butterfly valves, ignition controllers, high and low pressure switches, gas over - pressure relief valves, gas gas
- liquid separators, primary pressure reducing valves, liquid phase switching valves, gas pressure gauges, low - pressure gauges,
ball valves, gas leakage alarms, stainless steel hoses, high - pressure gas hoses, etc. See Figure (5).
4,Temperature measurement system:
4.1 Thermocouples inside the furnace:
Four K-type nickel-chromium-nickel-silicon thermocouples with a wire diameter of 2.0 mm are used inside the furnace, which comply
with the requirements specified in 5.5.1.1 of GB/T9978.1 and GB/T 16839.1. They are covered with heat-resistant stainless steel
casings, and heat-resistant materials are filled in the middle. The stainless steel tubes are sheathed with corundum tube
protectors. The length of the hot ends extending out of the casings is not less than 25 mm, and they can withstand temperatures
above 1250℃.
4.2 Temperature measurement on the fire - exposed side:
There are 8 thermocouples on the back of the sample. Among them, 4 are copper - plate thermocouples (using thermocouple wires with
a diameter of 0.5 mm welded on circular copper plates with a thickness of 0.2 mm and a diameter of 12 mm), which meet the
requirements of K - type nickel - chromium - nickel - silicon thermocouples specified in GB/T 16839.1. Each copper plate is
equipped with an asbestos heat - insulating pad of 30*30*2(±0.5) mm. The density of the heat - insulating pad is 900 kg/m³ ± 100
kg/m³, and the thermal conductivity is 0.117 - 0.143 W/(m·K), meeting the provisions of 5.5.1.2 in GB/T9978.1. The other 4 are
high - precision K - type thermocouples with an outer diameter of 1 mm, which can be buried on the back of the sample for thermal
insulation efficiency testing.
4.3 Mobile temperature testing: It meets the requirements of GB/T 9978.1 - 2008. One handheld infrared measuring instrument is
used to measure the surface temperature of each point on the fire - exposed side.
4.4 Furnace temperature collection: K-type armored thermocouples are selected, which can withstand high temperatures above 1250°C.
The furnace temperature data acquisition system has the functions of storing real-time curves and historical curves, as well as
alarming for thermocouple open circuits and short circuits.
4.5 Ambient temperature measurement: The equipment is equipped with a stainless - steel armored thermocouple with an outer
diameter of 3 mm, which is used to measure the ambient temperature of the test. It is a K - type nickel - chromium - nickel -
silicon thermocouple complying with GB/T 16839.1.
5. Pressure measurement system:
5.1 Furnace pressure measurement: The measurement range is 0 - 100 Pa. A micro - differential pressure gauge imported from France
is used. It has a T - shaped measuring probe with a measurement accuracy of ±0.5 Pa. It has an over - pressure protection
function. When the pressure inside the furnace is higher than 100 Pa, the over - pressure protection program will be activated,
the gas supply will be stopped, and the test will be terminated. It complies with the standard GB/T 9978.1 - 2008.
5.2 The pressure inside the furnace chamber is recorded every 1 minute, and the accuracy of the recording device is 1 second. The
data is collected 3 times per second. For the furnace chamber pressure control and data acquisition, the furnace chamber pressure
can form a control loop with the smoke exhaust system according to the requirements of the standards mentioned in "Chapter 2:
Compliance Standards" for real - time control.
5.3 T - shaped measuring probe: It uses a SUS310S high - temperature - resistant stainless - steel tube, which passes through the
furnace wall from the inside to the outside of the furnace, ensuring that the pressure inside and outside the furnace is at the
same horizontal level.
5.4 Pressure transmitter: A high - precision pressure sensor from Kimo in France. The pressure should be 15 Pa ± 5 Pa within 5
minutes after the start of the test and 17 Pa ± 3 Pa after 10 minutes.
6. Pressure Relief System:
6.1 There is a smoke exhaust hole installed on the rear wall of the furnace body, which is connected to the smoke exhaust pipeline
to discharge the flue gas inside the furnace and control the pressure within the furnace. The air supply and exhaust in the
furnace are controlled by a 0.3kw powerful fan and a frequency converter. The air volume is automatically controlled by a computer
program to meet the requirements of combustion, pressure, and smoke exhaust.
6.2 Pressure Relief Pipeline: The part inside the furnace chamber uses a SUS310S stainless steel pipe with a diameter of 300mm
that can withstand high temperatures. It can withstand a high temperature of 1300°C. Outside the furnace chamber, a welded pipe
with a wall thickness of 5mm is used.
6.3 Pressure Relief Power: An AC220, 0.3kw high-pressure fan that can withstand high temperatures.
6.4 Furnace Chamber Pressure Control and Data Acquisition: The pressure in the furnace chamber can be ensured to form a control
loop with the smoke exhaust system according to the requirements of the above various standards for real-time control.
7. Furnace design indicators:
7.1 Net volume of the device: 1.0 m³
7.2 Internal net dimensions of the device: Length × Width × Height = 1.0 × 1.0 × 1.0 m
7.3 External dimensions of the device: Length × Width × Height = 1.6 × 1.6 × 1.6 m (minor changes are acceptable)
7.4 Fuel used: Natural gas (calorific value: 8500 Kcal/Nm³) or industrial gas
7.5 Operating temperature: The long - term operating temperature of the furnace is below 1300°C. The temperature rises according
to the set formula.
8. Gas alarm: It is used in the gas chamber and the test site.
9. Number of combustion torches: 2 sets
10. Sample test racks: There are 2 sets of movable heat - resistant steel plates in total.
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