TT-D2Coke Reactivityand Post-Reaction Strength Testing Device
(Single Furnace Bottom Loading Reactivity)
I.Technical Parameters Description
The new TT-D2 coke reactivity and post-reaction strength testing device independently developed by our company is designed based on GB/T4000-2017 "Test Method for Coke Reactivity and Post-Reaction Strength". While retaining the technical advantages of the original equipment, it adopts more innovative designs in structure, material, and electricalgascontrol system, making it more automated, and test data more accurate and stable.
II. Product Function
The thermal reactivity and post-reaction strength of coke are important indicators of its high-temperature metallurgical properties. Coke with good reactivity can promote indirect reduction in the upper part of the blast furnace and release a certain amount of heat, which is beneficial for reducing the coke ratio. Coke with poor reactivity causes excessive direct reduction in the middle and lower parts of the blast furnace and absorbs a large amount of heat, leading to an increase in the coke ratio and higher blast furnace smelting costs.
The post-reaction strength index of coke directly reflects whether the coke can still play a skeletal support role under the huge pressure of the material column in the middle and lower parts of the blast furnace. Therefore, the detection tests of coke thermal reactivity and post-reaction strength are important means to inspect coke quality and provide important production operation basis for the blast furnace smelting process.
III. Process Structure
1. The reaction furnace shell adopts 304 stainless steel housing structure, with a beautiful appearance.
2. An automatic lifting system is installed on the outside of the reaction furnace shell. The reactor can be raised or lowered by operating the automatic control switch, used for loading and unloading the reactor. After the experiment, automatic unloading can be selected with manual intervention.
3. Zirconium-containing ceramic fiber furnace lining (heating element embedded) – a new high-temperature resistant furnace insulation material, with a maximum temperature resistance of 1400°C.
When the test furnace is running, more than 90% of the heat released by the heating element radiates through the furnace tube to the inside of the furnace, with only a small amount of heat loss. Numerous tests have proven that after adopting the new zirconium-containing ceramic fiber insulation lining, energy consumption is reduced by more than 30%, greatly improving the insulation effect.
4. Between the inner wall of the furnace lining and the outer wall of the furnace tube, a 20mm air medium heat exchange chamber is designed. The furnace lining heat exchange chamber is a very important design process that directly affects the constant temperature zone. Its function is to resist the heat dissipation effect of the reactor metal.
IV. Technical Features
1.PLC Control System
The PLC control system adopts Siemens S7-200SMART control system from Germany, with high reliability, strong anti-interference ability, and stable operation.
2. Mass Flow Controller Control
A high-precision mass flow controller from Horiba, Japan, is used to automatically control the flow of N2 and CO2 gas during the test. It is characterized by stability, intuitiveness, and no drift. A rotameter is also added for intuitive monitoring.
3. Exhaust Gas Combustion
The CO gas generated during the CO2 reaction is fully combusted at the top of the furnace after being heated by the furnace chamber, and then discharged outdoors through a fan. No CO is emitted indoors or outdoors, making it safe and environmentally friendly.
4. Single Corundum Tube Triple-Junction Thermocouple Furnace Temperature Monitoring
The test furnace uses a single triple-junction S-type thermocouple to measure temperature, monitoring the heating element and sample center temperature in real time. Real-time temperature display is available on both the computer and control panel for easy observation.
5. Greatly Increased Service Life of Spare Parts
Adopting a split embedded furnace chamber: three heating elements can be independently controlled and replaced. The overall service life is up to more than 1 year, greatly reducing the cost of spare parts and consumables.
6. Automatic Gas Source Switching Function
Internally integrated dual N2, dual CO2, and gas source switching functions. When one set is used up, it can automatically switch to the other auxiliary gas source, improving gas utilization while effectively avoiding experiment failure and the trouble of changing gas cylinders midway. It saves customers from wasting residual gas in cylinders and reduces experimental gas costs.
