Preparation method of sulfur-fixed ash based coal-fired power plant flue gas mercury removal adsorbent

Abstract

The invention relates to a preparation method of a sulfur-fixing ash-based coal-fired power plant flue gas mercury removal adsorbent. At present, there is no energy-saving, environmentally friendly, and simple-to-operate preparation method for the sulfur-fixing ash-based coal-fired power plant flue gas mercury removal adsorbent. The present invention is characterized in that it comprises the following steps: (1) taking by weight 60-80 parts of sulfur-fixing ash, 10-15 parts of clay, 5-10 parts of activated carbon and 5-15 parts of bromide, And add water to mix evenly, impregnate for 4-8h, use a mixer to stir at a constant speed during the impregnation modification; (2) adopt the cold-setting molding process, use the granulator to make the impregnated and modified adsorbent into spherical particles, and place it in a natural state (3) Place the naturally dried spherical adsorbent particles in a vacuum drying oven to dry for 12-24 hours, then take them out and cool them to room temperature in a desiccator to obtain sulfur-fixed ash fume Mercury removal adsorbent. The invention can effectively reduce the cost and is easy to operate.

Description

technical field

[0001] The invention relates to a preparation method of a flue gas demercury adsorbent, in particular to a preparation method of a sulfur-fixed ash-based coal-fired power plant flue gas Gas demercury sorbent method. Background technique

[0002] In the process of coal combustion, the flue gas not only contains NO x , SO x And dust, but also contains Hg, As and other volatile, toxic and harmful elements. According to statistics, the global annual Hg emission is 4400-7500 tons, about half of which comes from Asia. The Hg content in most coals in my country is between 0.01-1mg / kg, and the annual Hg emission of power plants exceeds 300 tons. Hg in the atmosphere can enter the human body through the respiratory system or the food chain, seriously endangering human health. Especially methylmercury can pass through the placental barrier, damage the nervous system, immune system and circulatory system of newborns, and affect the intelligence of newborns. [000...

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