Refined coal briquette press ball machine is mainly used for combustion in power plants, metallurgy and other industries have a higher value, but the practical application problems usually occur, the following is coal production and use often occur several problem. 1) cold briquette strength is low: low cold briquette strength is caused by the following aspects. ① raw coal in the water is too high, causing the adhesive can not be added according to the amount of moisture in the molding process generally briquette material (coal moisture 5-6%, 4-7% moisture binder is added) preferably between 11-13%; ② adhesive bond strength is not enough; ③ mechanical configuration and the pressure is not good, cause can not be combined with coal and binder normal force play. 2) hot briquette strength and slagging bad: the petrographic composition of ash and hot strength of coal and coal-related. It requires coal ash not high, but it is not too low ash melting point, which is when we make the choice of raw coal in coal ash is lower, so that the coal production process, in order to improve the briquette hot intensity of the need to add a certain amount of bentonite or kaolin to improve the ash melting point, play at a certain temperature coal skeleton is not the role of melting. Slagging of coal and raw coal with ash content of the total composition of the ash fusible ingredients of a great relationship, coal furnace slagging tendencies in addition to operating conditions, the melting point of the coal-related, but also with coal The ash content greater relationship. Coal mineral content and composition of coal ash fusion temperature and viscosity are the main factors of coal slagging, and binder join these four factors will inevitably change, thus affecting the slagging of coal . Therefore, the nature of the binder also slagging of coal in relation .3) poor thermal stability of coal: coal thermal stability refers to maintain the original lump of coal in the high-temperature combustion and gasification process and Nature is not broken into small pieces. Cause bad there are many factors coal thermal stability, thermal stability, good or bad is directly related to the fixed bed coal gasification and combustion can bring out the normal amount of dust. Thermal stability is not good for anthracite it mainly contains water of crystallization effect. And speaking of bituminous coal and lignite mainly volatile relationship between the physical and the number and amount of gum. Volatile excessive precipitation and crystallization water sharply at a certain temperature in the furnace, resulting in coal burst, while the coal drying process is actually a low-temperature drying process, and can precipitate a part of volatiles and crystallization water, coal free water surface adsorption, generally slightly higher than 100 ℃, after sufficient time to precipitation, and stored in the coal substance in the crystal water, usually above 200 ℃ to precipitate .4) reactivity briquette: Model reactivity of coal means that under certain conditions of temperature, steam coal with CO2 or O2 reaction capability of interaction is a very important characteristic index of combustion and gasification, coal metamorphism of coal reactivity and porosity rate, inorganic components and coal facies characteristics. General deterioration deeper level, the lower reactivity of coal, the higher the reactivity of the more developed pore structure, and coal can improve its response through activation of blending, composition and particle size by crushing a suitable molding pressure to improve pore structure and porosity to note here are: excessive molding pressure although improved cold strength, but size is too small crushing cause porosity briquette too close, the impact of coal, resulting in poor reactivity.