Ammonia process for performing desulfurization and denitration on flue gas simultaneously

Abstract

The invention discloses an ammonia process for performing desulfurization and denitration on flue gas simultaneously. On the basis of ammonia process desulfurization and denitration and a complexing principle, the ammonia escape phenomenon of absorption liquid at each reaction stage is improved by adjusting the composition of the absorption liquid, the concentration of free ammonia in the absorption liquid is ensured, the circulation flow rate of the absorption liquid is reduced, denitration and desulfurization efficiency is improved, the flue gas purification effect is good, byproducts can be recycled, the environment is prevented from being polluted, the process can achieve an expected effect when applied to a denitration and desulfurization combined device and a denitration and desulfurization integrated device, industrial application can be truly realized, the process is more suitable to be realized by the denitration and desulfurization integrated device, and the effects of simplifying an equipment structure and reducing investment and energy consumption are achieved.

Description

technical field [0001] The invention relates to a process for flue gas desulfurization and denitrification, in particular to a process for simultaneously desulfurizing and denitrifying flue gas with ammonia. Background technique [0002] Boilers or thermal power plants that use coal or oil as fuel, and sintering machines in iron and steel plants that use iron ore as raw materials emit a large amount of flue gas. These flue gases contain harmful substances such as SOx, NOx, HCl and HF, among which sulfur oxides SOx (including SO2 and SO3) and nitrogen oxides NOx are the main substances that form acid rain. Depending on the type of coal burned, the SOx content is usually 300-5000ppmv (1000-15000mg / Nm 3 ), the NOx content of nitrogen oxides is usually 100-1000ppmv (300-3000mg / Nm 3 )between. However, the amount of flue gas discharged in the world is huge every year. In terms of coal-fired boilers, the steam scale ranges from 75T / h to 2500T / h, the capacity of generating units ...

AI Technical Summary

Problems solved by technology

[0014] The purpose of the present invention is to overcome the above defects, provide a process for simultaneous desulfurization and denitrification of ammonia in flue gas that can be applied industrially, solve the problem of ammonia escape in the absorption liquid, ensure the efficiency of denitrification and desulfurization, and by-products can be reused without producing New sources of pollution, the process has no strict requirements on equipment, low energy consumption, and economical and reasonable operation