Preparation method of calcium-based particle synchronous desulfurization and denitrification agent

Abstract

The invention relates to the technical field of solid waste treatment and resource utilization and flue gas desulfurization and denitrification, and discloses a preparation method of a calcium-based particle synchronous desulfurization and denitrification agent. The method comprises the following steps: s1, weighing a certain mass of Ca(OH)2, biomass ash, KMnO4, diatomite, PEO (polyoxyethylene), alumina sol and MgSO4 raw materials; s2, adding water into the raw materials in a kneading machine, mixing the components to form a uniformly dispersed wet blank material, and extruding the material a cylindrical or clover-shaped wet blank body by an extruder; s3, drying the wet green body in a dryer, and cooling the green body to obtain a finished product of the calcium-based particle synchronous desulfurization and denitrification agent. According to the calcium-based particle synchronous desulfurization and denitrification agent, the used raw materials are low in cost and wide in source, and the preparation process is simple. The calcium-based particle synchronous desulfurization and denitrification agent is large in specific surface area and high in strength, the desulfurization and denitrification efficiency reaches 98% or above, the desulfurization and denitrification efficiency reaches 80% or above, the applicable flue gas temperature range is wide, and ultralow emission of SO2 and NOx is satisfied.

Description

technical field [0001] The invention relates to the technical fields of solid waste treatment and resource utilization and flue gas desulfurization and denitrification, and discloses a preparation method of a calcium-based particle synchronous desulfurization and denitrification agent. Background technique [0002] On April 28, 2019, five national ministries and commissions jointly issued the "Opinions on Promoting Ultra-Low Emissions in the Iron and Steel Industry", proposing that flue gas SO 2 , NO X , the hourly average of particulate matter emission mass concentration is lower than 35mg / Nm 3 , 50mg / Nm 3 , 10mg / Nm 3 (standard state, dry basis). At this stage, some non-electricity enterprises flue gas NO X Selective catalytic reduction (SCR) is used for ultra-low emission control. denitration reducing agent NH 3 will interact with SO in the flue gas 2 , SO 3 A chemical reaction occurs, producing viscous NH 4 HSO 4 and powdered (NH 4 ) 2 SO 4 In order to avoid...

AI Technical Summary

Problems solved by technology

The flue gas exhaust temperature in non-electricity industries is generally 90-200°C, and the exhaust gas temperature is relatively low. If it is heated to a medium-temperature denitrification temperature of 320-400°C for denitrification, the gas consumption is large, the investment and operation costs are high, and the technology cannot be directly transplanted.

[0003] In the Chinese patent literature application number 201610375470.5, a semi-dry desulfurization process calcium-based desulfurizer and its preparation method are disclosed. The gradation design of raw material particle size can effectively solve the problem of high cost of desulfurization agent in the semi-dry desulfurization process and the waste resources generated in the production of lime kiln. Afterwards, the temperature drops a lot, and it still needs to consume a lot of fuel (such as gas, natural gas, etc.) when heated to the temperature required for denitration.

[0004] In the Chinese patent document application number 201310528591.5, a modified calcium-based desulfurization agent for dry desulfurization of sintering flue gas and its preparation method are disclosed, which is characterized in that limestone, urban domestic sludge, and anthracite powder are mixed according to a certain ratio Uniform, modified calcium-based desulfurization agent for dry desulfurization of sinter flue gas is prepared through calcination, cooling, grinding and other processes, but the production process is complicated, energy consumption is high, and the desulfurizer particles are small, which is easily carried by the outlet flue gas. Form secondary pollution, no denitrification function

[0005] The Chinese patent document application number 201810461190.5 discloses a calcium carbide slag composite calcium-based desulfurizer based on biomass conditioning and its preparation method, which is characterized in that the biomass is mixed with wet calcium carbide slag to adjust the moisture in the wet calcium carbide slag, so that there is no need In the case of heating and drying process, the problem of wet calcium carbide slag entering the furnace is solved, but calcium carbide slag composite calcium-based desulfurizer is mainly used in the field of desulfurization in circulating fluidized bed furnaces, the desulfurization efficiency is low, and it does not have denitrification function

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