Coal-combustion sulfur-fixing agent and preparation method thereof

Abstract

The invention belongs to the technical field of desulfurization, in particular to a coal-combustion sulfur-fixing agent and a preparation method thereof. The coal-combustion sulfur-fixing agent is prepared from the following raw materials in parts by weight: 50-75 parts of calcium oxide, 10-26 parts of zinc slag, 2-5 parts of copper slag, 4-8 parts of an activator, 1-5 parts of a stabilizer and 1-3 parts of an exciting agent. The sulfur-fixing agent is good in sulfur-fixing effect, the sulfur-fixing ratio is larger than or equal to 97%, the sulfur discharge amount is less than or equal to 30 mg/m<3> and zero emission is realized basically; in addition, coal combustion is sufficient, the coal consumption of a boiler is reduced by 5% or above in average and the discharge amount of carbon and CO is effectively reduced; the mineral composition of fly ash is improved due to generation of calcium sulphoaluminate and dicalcium silicate and the activity of fly ash is improved.

Description

technical field [0001] The invention belongs to the technical field of desulfurization, and in particular relates to a sulfur-fixing agent for coal combustion and a preparation method thereof. Background technique [0002] my country is the world's largest producer and consumer of coal, and coal-fired flue gas has also become a source of SO in my country. 2 The main source of emissions, my country's SO 2 The total emission has been around 20 million tons for many years. When the sulfur dioxide emitted into the atmosphere is oxidized to sulfur trioxide by photosynthesis, it combines with water vapor and smoke to form "acid rain". At present, acid rain has become a worldwide environmental pollution problem. my country's acid rain area has reached more than 40% of the country's land area. Since the problem of sulfur dioxide pollution from coal combustion has become one of the urgent environmental problems to be solved in my country, in recent years, my country has attached gr...

AI Technical Summary

Problems solved by technology

[0003] At present, at home and abroad, most of them use the method of adding sulfur-fixing agent to the raw coal to reduce the SO in the combustion exhaust. 2 , the main raw material of the traditional sulfur-fixing agent is calcium carbonate, which is easy to decompose in the process of coal combustion at 800-900 °C, and the desulfurization effect is poor. Moreover, calcium carbonate decomposes at high temperature and absorbs heat, which consumes a large amount of heat in the coal-fired combustion process, and the production efficiency is low.

Images