Coal burning catalyzing and inducing activator for cement industry and its use

Abstract

The present invention belongs to the field of fuel coal activator, and is especially one kind fuel coal catalyzing and inducing activator for cement industry. The fuel coal catalyzing and inducing activator consists of iron powder 30-60 wt%, carbide slag 20-50 wt% and modifying leftover 10-30 wt%. The modifying leftover is obtained with hydrocarbon leftover from food and petrochemical industry and aerated concrete powder in the weight ratio of 60-90 to 10-40 and through pulverizing for 0.5-1.0 hr. The present invention can lower coal powder igniting temperature, raise coal powder burning-out degree and speed burning of coal, and has the features of low cost and no negative effect on cement clinker performance, and is suitable for bituminous coal with high ash content, anthracite coal with low volatile component content and other kind of coal.

Description

technical field [0001] The invention belongs to the field of coal-burning activators, and in particular relates to a coal-burning catalytic-induced combustion activator in the cement industry and an application thereof. Background technique [0002] In 2004, my country's total cement output reached 970 million tons, and the total energy consumption of cement reached more than 100 million tons of standard coal, accounting for 10% of the country's total coal output. Therefore, the development of the cement industry, which is high in energy consumption and low in output, will be restricted under the situation of increasingly tense energy consumption in various countries. The selection and utilization of fuel determine the economic benefits of a cement enterprise to a large extent, but it is limited to the current level of cement production technology, and the range of coal types that can adapt to cement production is relatively narrow. Generally, large and medium-sized enterpri...

AI Technical Summary

Problems solved by technology

[0003] Coal with low volatile content and high ash content is used in the decomposition kiln outside the kiln, because of its poor flammability, high ignition temperature, slow burning speed, and not easy to burn out, it will bring unstable factors to cement production

Especially in the calciner, because the endothermic reaction of calcium carbonate decomposition is carried out simultaneously with the fuel combustion, the combustion rate of the fuel will directly affect the decomposition rate of calcium carbonate, affecting the normal operation of the calciner, making the kiln carbon dioxide The calcium decomposition rate cannot meet the production requirements, thereby increasing the heat load of the kiln system, resulting in unstable working conditions and difficult operation and control; at the same time, due to its low burnout degree, unburned coal powder is easily brought into the next stage of suspension preheater, Continued combustion will cause the local high temperature of the next stage suspension preheater, which will cause the crust blockage of the preheater system and hinder the safe production, which limits the popularization and application of low volatile and high ash coal to a large extent

Moreover, the residues of pulverized coal combustion (ashes, etc.) enter the rotary kiln together with the decomposed calcium oxide for calcination to produce clinker, which will affect the quality of the final cement to a certain extent.

[0004] In recent years, in order to improve the combustion status of coal, a lot of work has been done on the research and use of coal-fired high-efficiency activators at home and abroad, and many patents have been applied for, but these research results are aimed at the power generation and boiler industries, and most of them are K + , Mg 2+ 、Na + , Cl - Combustion aids such as cement clinker that have a negative impact are not necessarily suitable for cement production

At the same time, most of the commercially available combustion aids have disadvantages such as high dosage, high price, and selectivity to coal types, and the method of adding combustion aids by soaking coal powder in a solution is used in the coal-fired industry