There are three methods for general evaluation of coal cold and thermomechanical strength: 1 compressive strength; 2 drop strength; 3 wear resistance. Compressive strength refers to the maximum pressure that a briquette can withstand when it is crushed. This index can be used to distinguish the relative strength of the pulverized coal particles inside the briquette, which should generally be expressed by the maximum pressure per unit area of ​​the briquette. However, most coal briquettes have a curved surface and are difficult to achieve flat contact when pressed. Therefore, in many cases, the maximum pressure that each briquette can withstand is expressed in units of N/block. This representation is not very rigorous because it is closely related to the size and shape of the briquette and the pressure contact surface or point. The strength measured at normal temperature is called cold compressive strength. After the briquette is heated at a high temperature for a certain period of time, the measurement is performed, that is, the hot compressive strength. Although the compressive strength can judge the relative strength of the combination of the pulverized coal particles in the briquette, it is not possible to identify the impact resistance of the briquette. Therefore, it is not enough to simply use the compressive strength as the briquette strength index. As mentioned above, in the process of using briquette, the briquette has to withstand multiple drops, so it is also required that the briquette has a certain impact resistance. The drop strength of briquette is one of the quality indicators for identifying the impact resistance. Briquette wear resistance is important for refining iron, magnesium, calcium and phosphorus fertilizer production of briquettes prepared ammonia synthesis feed gas is used, it is also one of the detection of the degree of solid coal inside the pulverized coal particles are bonded to each method. It is generally determined by a method of drum test to identify the quality of coke , but the specific operations and equipment are different. After passing through the drum test, the briquette is sieved to express its wear resistance with a mass percentage of particle size greater than 13 mm. The briquette can be subjected to the abrasion test in the cold state or in the hot state, and the wear resistance in the hot state can be measured to be closer to the actual situation at the time of use. Obviously, the higher the wear resistance of the briquette, the less likely it is to be powdered and increased in the furnace when it is burned and gasified. In short, compressive strength, drop strength and wear resistance are the three main indicators for judging coal cold and thermo-mechanical strength. Mechanic Car Creeper,Car Creeper,Auto Mechanic Creeper,Electric Mechanics Creeper WUQIANG HONGMA TOOLS MANUFACTURE CO., LTD , https://www.zjhongma-tool.com
Method for judging the quality of finished ball of coal briquetting machine
The combustion efficiency is low polluting pulverized coal is processed into industrial boilers, furnaces with coal, has gradually become a new trend, bulk coal and briquette can be reduced compared to about 70% of the soot emissions, saving 15 The energy of %, due to the addition of sulfur-fixing agent in the production process of briquette, also greatly reduces the emission of sulfur dioxide. However, due to the increasing popularity of briquette, due to the increasing number of coal-fired enterprises in some enterprises, The quality of briquette is uneven. The quality of industrial briquette is mainly affected by briquette strength, water resistance and flammability. At present, the defects of briquette in China are mainly due to the low strength of briquette and low calorific value, so when we purchase briquette It is necessary to pay attention to the test of cold coal and thermal mechanical strength. Common test methods include: compressive strength, drop strength and wear resistance. It is reported that the mechanical strength of briquette is also closely related to briquette equipment, while briquette The increase of strength also affects the combustion characteristics of briquette to a certain extent, and the calorific value of briquette is better judged.