Coal quality test steps and methods - Database & Sql Blog Articles

Test Procedures and Methods---------Feng Cunde, Hebi City Instrument Factory Co., Ltd. The first step: sampling the five-point sampling method, taking five points on the diagonal, not on the surface, one point per shovel A bucket. The coal sample taken is as representative as possible and randomly sampled. Mix the coal sample and sort it. Finally, leave about one kilogram as the sample to be tested. If there is a piece of coal, please pick out the crusher. The second step: the first step of testing the coal from the water needs to be water, that is, the outer water of the coal. Required utensils: Weighing bottle electronic balance drying box test method and formula As follows, first open the drying box, raise the temperature to 150 degrees, weigh the weighing bottle on the balance, and record the tare weight. Then weigh out 10-11 grams of coal to record the weight of coal. Bake in a dry box for 1 hour, take it out and cool it, and weigh the weight on the balance and record the weight after baking. The formula is as follows: tare + coal weight - after baking quality --------------------- coal weight third step: dry sample preparation with stainless steel plate installed about 200 The coal sample around gram is dried in a dry box and baked at 150 degrees for about 30 minutes. After drying, it is ground into a coal sample in a sample preparation machine. All the following items are prepared coal. Step 4: Make sulfur and follow the instructions. Step 5: The ash is first raised to 850 degrees, and the program control is operated according to the instructions. Weigh the weight of the ash dish on the balance and record the tare weight. Weighed about 1 gram of coal and recorded the weight of the coal. Open the high temperature furnace, and slowly push the weighed coal into the furnace for no less than 40 minutes. Point 1, the push process is slow, and the coal cannot deflagrate. Point 2, the time for burning should be sufficient. The formula is as follows: the quality after burning - tare ------------------ coal weight sixth step: volatiles first raise the furnace to 900 degrees, program control according to the instructions. Weigh the weight of the cockroach on the balance and record the tare weight. Weighed about 1 gram of coal and recorded the weight of the coal. Open the furnace door and quickly put the weighed coal into the stove. Look at the watch, take it out after seven minutes, cool, and weigh the weight after burning. Tare + coal weight - weight after burning ----------------------- *100% - 1% coal weight seventh step: heat according to the instructions .