摘要:
Bei dem erfindungsgemäßen Verfahren zur Reinigung von Vorwärmerabgasen einer Anlage der Zement- und/oder Mineralsindustrie durch Reduktion der Konzentration von gasförmigen Schadstoffen, werden die Vorwärmerabgase zunächst einer Hochtemperaturfiltration zur Reduzierung des Staubgehalts unterzogen, wobei anschließend eine erste Abgasbehandlung durch selektive katalytische Reduktion und eine nachfolgende zweite Abgasbehandlung durch regenerative katalytische Oxidation folgen. Die erfindungsgemäße Anlage zur Reinigung von Vorwärmerabgase (1) der Zement- und Mineralsindustrie durch Reduktion der Konzentration von gasförmigen Schadstoffen beinhaltet einen Hochtemperaturfilter (2) zur Reduzierung des Staubgehalts der Vorwärmerabgase, einen SCR-Katalysator (3) zur selektiven katalytischen Reduktion der Vorwärmerabgase und eine nach dem SCR-Katalysator angeordnete regenerative Oxidationskatalysator-Anlage (4) zur regenerativen katalytischen Oxidation der Vorwärmerabgase.
摘要:
This object is achieved using an existing water injecting technology used in precalciners for NO x control. The inventive method comprises the step of injecting water into the precalciner to control the temperature. Thanks to considerably different time horizons of the NO x control on one side and the temperature control on the other side, the two objectives can be achieved in parallel. The short term variations on the water injection for temperature control purposes are superposed to the long term water injections necessary to provide appropriate NO x control.
摘要翻译:该目的是使用用于NO控制的预分解器中的现有注水技术实现的。 本发明的方法包括将水注入预分解器以控制温度的步骤。 由于在一侧的NO x SUB>控制和另一侧的温度控制有显着不同的时间间隔,所以两个目标可以并行实现。 用于温度控制目的的注射用水的短期变化与提供适当的NO x控制所需的长期注水叠加。
摘要:
El procedimiento propuesto consiste en sobrecalentar una corriente de material calcinado (normalmente CaO) hasta una temperatura por encima de la temperatura de calcinación, y hacer circular esta corriente sobrecalentada de material calcinado hasta el calcinador, donde los sólidos ceden calor. A este calcinador se alimenta también la corriente de material a calcinar (normalmente CaCO 3 precalentado) para que el calor cedido por la corriente caliente de CaO produzca la descomposición en CO 2 y CaO del CaCO 3 alimentado. Una parte del CaO que abandona el calcinador es el producto calcinado, y el resto se recicla para su sobrecalentamiento en un combustor. El CO 2 generado en la etapa de calcinación se obtiene de forma pura o fácilmente purificable y es por tanto susceptible de uso o confinamiento.
摘要:
Described is a method as well as a plant for preheating particulate or pulverulent material such as cement raw meal or similar material in a cyclone preheater (1), comprising at least two cyclone stages, each comprising a riser duct (2a, 2b, 2c, 2d) and a cyclone (1a, 1b, 1c, 1d). The method is peculiar in that a portion of the material which is fed to at least one cyclone stage is introduced to the first part of the riser duct, viewed in the direction of travel of the exhaust gases, and is heated from a temperature of maximum 450 °C to a temperature of at least 550 °C, and in that the remaining material which is fed to the same cyclone stage is introduced into the last part of the said riser duct. As a result, there will be a reduction in the amount of SO 2 which is discharged from the cement plant preheater as emission, without a simultaneous increase in energy consumption.
摘要:
In a method of increasing the clinker output of an existing cement plant and of producing steam, a raw meal is preheated in a preheater (50), then burned in a rotary kiln (16) to form clinker, and the clinker is cooled in a clinker cooler (20). Calcined raw meal, consisting essentially of lime and combustion residues like ash, carbon and desulfurization residues is fed to the preheater (50). Process air from the clinker cooler (20) is directed to the preheater (50) in countercurrent flow to the direction of flow of the calcined raw meal. The calcined preheated raw meal is directed to the rotary kiln (16). The kiln exhaust gases are 100 % bypassed and used for steam production in a boiler (60). The kiln exhaust gases are quenched to a temperature of about 800-900 °C prior to their heat exchange in the water/steam cycle.
摘要:
The co-combustion process may comprise the following unit operations: routing of hot gas (10) generated in the clinker cooling process to a rotary kiln (1); use of part of the rotary kiln exhaust gas to dry solid wastes in rotary dryers; leading the gases from both the dryer and the combustion kiln to the secondary combustion chamber (2); use of additional fuel to boost up the secondary combustion chamber reaction temperature to as high as 1200 DEG C; primary dry gas scrubbing in a precalciner or precalciners (3, 3a); heat recovery (4) and power generation; secondary gas scrubbing (5) in a semi-dry scrubber; bag filtering after activated carbon injection and returning of all the collected ash and used carbon into the waste kiln and/or a cement kiln. Detrimental materials for cement processing generated by waste combustion can be by-passed to a scrubbing system and a cement kiln. Residue slag from waste kilns can be treated and reused.
摘要:
In a method of producing cement clinker and electricity, cement raw mix and hydrocarbon are fed in a circulating fluidized bed boiler (1). Therein cement raw mix is calcined and steam is produced. Gas and solids out of the fluidized bed enter a cyclone (8), the solids being separated therein and returned to the bed. Part of those solids are first cooled down in a solids heat exchanger (9) producting steam. Fly ash consisting predominantly of lime and gas escaping the cyclone are passed through a heat exchanger (28, 33) and a filter (37). Hot bed material is discharged from the circulating fluidized bed and is ground with additives, then blended with lime being separated in the filter (37), then supplied to a rotary kiln (16), wherein the solids are clinkered. The produced steam is fed to a steam turbine island (42).