Flue gas absorbent which simultaneously has functions of desulphurization and denitration and preparation method and application thereof

Abstract

The invention discloses a flue gas absorbent which simultaneously has functions of desulphurization and denitration and a preparation method and an application thereof. Calculated according to 1L of deionized water, the flue gas absorbent provided by the invention is composed of 1.66-594g of an oxidizing agent, 3.8-1144g of a buffering agent, 2.7-222g of a stabilizing agent and 1L of deionized water. The preparation method provided by the invention comprises the following steps of: adding the buffering agent into 1L of deionized water, dissolving and uniformly mixing, adding the stabilizing agent, dissolving and uniformly mixing, adding the oxidizing agent, fully dissolving and uniformly mixing to obtain the absorbent. The absorbent provided by the invention and a calcium-based absorbent are simultaneously used so as to realize desulphurization and denitration in a same device, have high removal efficiency, and have less corrosion to the device with no discharge of desulphurization wastewater. In addition, desulphurization byproducts are dry, which is in favor of comprehensive utilization, disposal and stacking.

Description

technical field [0001] The invention belongs to the field of flue gas purification treatment, and relates to an absorbent for flue gas purification treatment and application thereof, in particular to an absorbent for simultaneous desulfurization and denitrification of flue gas, a preparation method and application thereof. Background technique [0002] At present, fossil fuels such as coal, oil, and natural gas are still the main energy sources for human beings. It is well known that the SO emitted from its combustion process 2 and NO x It can form acid rain and other secondary pollutants, which have seriously affected human production and life, and caused huge economic losses. Relevant data show that the annual economic loss caused by acid rain in China is about 110 billion yuan. Therefore, the control and purification of harmful gas pollution such as sulfur dioxide and nitrogen oxides are very important, which is related to the development of the national economy, especi...

AI Technical Summary

Problems solved by technology

The current main problems of dry process technology are relatively low removal efficiency, cumbersome preparation process of absorbent and low utilization rate, etc.

Chinese patent 200310103954.7 discloses a flue gas desulfurization and denitrification purification method and device, which sprays a solid high-activity absorbent based on fly ash, lime and additives into a circulating fluidized bed reactor, Absorb sulfur dioxide SO in flue gas 2 NO x ; Use the return leg on the dust removal device to send the incompletely reacted highly active absorbent back to the feeding pipe for recycling, but the preparation process of the highly active absorbent in this method is cumbersome

Moreover, changing the flue gas flow mode from a single upward to an upward and then downward flow mode reduces the space height of the flue gas purification equipment, but this method is cumbersome and occupies a large area. It can be expected that this method will be used in practical engineering The investment and operating costs will be huge

[0005] In addition, in order to achieve simultaneous desulfurization and denitrification at low cost, some desulfurization and denitrification agents used to be prepared with chlorine-containing strong oxidants as additives, such as Chinese patent 200610051721.0 and Chinese patent 200610012525.2. Although the removal efficiency is high, it is easy to cause equipment corrosion. and secondary pollution