Building material flammability testing machine

Product Name: Refractory Testing Machine for Building Materials Product Model: ZY6017E-PC Product Purpose: Suitable for the determination of refractory performance of building materials. Manufacturer prices: Non standard customization prices vary, welcome to choose and quote!

1、 Application purpose:

This standard is applicable to the determination of the flame retardancy of building materials.

This standard specifies the preparation of test specimens, test operations, test equipment, determination of residual length after combustion of test specimens, determination conditions, and test reports for the flame retardancy test of building materials.

2、 Compliant with standards:

Complies with GB/T8625-2005 "Test Method for Refractory Properties of Building Materials".

3、 Experimental apparatus:

The experimental setup of this method mainly includes two parts: a combustion vertical furnace and testing equipment.

1. Combustion shaft furnace.

The combustion vertical furnace is mainly composed of a burner, a combustion chamber, a specimen support, an air flow stabilizing layer, and a flue.

Its external dimensions are 1020mmX1020mmX3930mm.

1.1 Combustion chamber.

The combustion chamber is composed of furnace walls and doors, with an internal space size of 80mmX800mmX2000mm.

The furnace wall is a thermal insulation sandwich structure, and its structural form is shown in Figure 2.

The furnace door is divided into upper and lower doors, which are connected to the furnace body with hinges, and their structure is similar to the furnace wall.

The two doors are closed to the furnace body with the help of a handwheel and a fixed screw.

Observation windows are installed on the upper furnace door and the rear wall of the combustion chamber.

1.2 Burner.

The burner is horizontally placed at the center of the combustion chamber, 1000mm away from the furnace bottom.

1.3 Test piece bracket.

The specimen support is a rectangular frame with a height of 1000mm, and there are screws on all four sides of the frame to adjust the installation distance of the specimen. The frame is made of angle steel.

1.4 Stable air flow layer.

The air flow stabilizing layer is a box made of angle steel, set below the burner, with steel wire mesh laid at the bottom of the box and multiple layers of fiberglass felt laid on top.

1.5 Smoke duct.

The flue of the combustion vertical furnace is a square channel with a cross-sectional area of 500mmX500, located at the top of the furnace, with the lower part connected to the combustion chamber and the upper part connected to the external chimney.

1.6 Gas supply.

To create a uniform airflow in the combustion chamber, air is fed into the lower part of the furnace through a Φ 200mm pipe at a constant rate and temperature.

2. Testing equipment.

The testing equipment for the combustion vertical furnace includes flow meters, thermocouples, temperature recorders, temperature display instruments, and furnace pressure testing instruments.

2.1 Flow meter.

The measurement of methane gas and compressed air flow rate uses a flow meter with an accuracy level of 2.5 and a range of (0.25~2.5) m ³/h.

2.2 Thermocouples.

The measurement of flue gas temperature and furnace wall humidity is carried out using a precision level II nickel chromium nickel silicon Kai type thermocouple with a wire diameter of 0.5mm and an outer diameter not exceeding 3mm. The installation location is shown in Figure 2.

2.3 Temperature recorder and display instrument.

The temperature measurement adopts microcomputer display and recording, with a testing accuracy of 1 ℃.

Continuous recording electronic potentiometers with an accuracy of 0.5 level that are compatible with thermocouples or other suitable continuous recording instruments can also be used.

3. Furnace pressure.

A T-shaped furnace pressure test tube with an inner diameter of 10mm and a head width of 100mm is installed at a distance of 100mm from the flue wall, 2700mm from the bottom of the furnace. It is connected to a microcomputer or other recorder through a differential pressure transmitter with an accuracy of 0.5 level for continuous monitoring.

4. Calibration tests of various components in the combustion vertical furnace.

4.1 Uniformity test of thermal load.

To ensure the uniformity of the thermal load borne by the test specimen during the test, four 1000mm x 3mm stainless steel plates are placed on the test specimen rack. One nickel chromium nickel silicon thermocouple is firmly set on the centerline 200mm from the bottom of each stainless steel plate, and the test is carried out according to the operating procedures specified in Chapter 5.

After 10 minutes of testing, the average temperature measured by the four thermocouples on the stainless steel plate should meet the requirement of 540 ℃± 15 ℃.

Otherwise, the device should be debugged and the test must be conducted every 3 months.

4.2 Uniformity test of air.

Under the condition of gas supply with the furnace door closed under the combustion vertical furnace, take 5 points on the steel wire mesh of the air steady flow layer, 50mm away from the mesh, and use a hot ball micro anemometer or other anemometer with the same accuracy and measurement error not exceeding 10% to measure the wind speed at each point.

The average wind speed measured at 5 speed measurement points should be converted into air flow rate and meet the gas supply requirement of (10 ± 1) ㎡ min for the vertical furnace. This test must be conducted every six months.

4.3 Inspection of flue gas temperature thermocouples.

To ensure the accuracy of flue gas temperature measurement, a check of the flue gas temperature thermocouple should be conducted at least once a month. Any smoke stains should be removed, and if the thermocouple is displaced or deformed, it should be calibrated to the specified position.