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...

AI Technical Summary

Problems solved by technology

For example, the publication date is October 13, 2010, and the Chinese patent with the publication number CN101856607A discloses a flue gas mercury removal adsorbent, which adopts the following components by weight: 10-25% 2-5% clay, 2-5% polyethylene, 2-5% rice husk, 5-10% calcium oxide, and the balance is fly ash; after mixing the components, add water and mix thoroughly, and then extrude and granulate into Particles with a particle size of 30-50mm are obtained by sintering at a high temperature of 900-1100°C for 2-4 hours; although the main raw material of the flue gas demercury adsorbent is fly ash, which reduces the cost of raw materials, it needs to be processed at 900-1100°C. Sintering at a high temperature of 1100°C for 2-4 hours consumes a lot of energy, which is not conducive to energy saving and environmental protection

Another example is that the publication date is March 16, 2011, and the Chinese patent with the publication number CN101985099A discloses a method for preparing a flue gas mercury removal adsorbent. The preparation method of the flue gas mercury removal adsorbent includes: biomass heat Preparation of pyrolysis: put biomass pyrolysis coke into a container containing ammonium halide solution for immersion, and stir continuously for 8-12 hours; filter to remove biomass pyrolysis coke moisture, and dry at 45-50°C ; Although the preparation method of this adsorbent is simple, the cost is low, and it can effectively adsorb mercury in the flue gas, but the adsorption effect is not ideal.

[0004] To sum up, there is currently no energy-saving, environmentally friendly, cost-effective, and simple-to-operate method for preparing a sulfur-fixing ash-based coal-fired power plant flue gas mercury removal adsorbent.

Images