Low-temperature coke oven flue gas desulfurizing and denitrifying process

Abstract

The invention discloses a low-temperature coke oven flue gas desulfurizing and denitrifying process. The low-temperature coke oven flue gas desulfurizing and denitrifying process comprises the following steps: firstly, preparing an SCR catalyst, wherein the catalyst is obtained by preparing clay, polymethyl methacrylate and sodium silicate into a carrier and then loading metal oxides of manganese and cerium, and the catalyst has good catalytic activity at low temperature and a large adsorption rate; then in a desulfurizing and denitrifying step, dedusting coke oven flue gas first and then injecting the coke oven flue gas into a desulfurizing adsorption zone for desulfurizing, wherein a desulfurized product is adsorbed by the SCR catalyst, and the catalyst can be recycled after desulfurization regeneration and activation treatment; injecting the dedusted and desulfurized coke oven flue gas into an SCR reaction zone, injecting cyanuric acid and ammonia gas into the SCR reaction zone in a mixing manner, contacting with the coke oven flue gas and the SCR catalyst, denitrifying, and discharging the desulfurized and denitrified flue gas after the catalyst is recycled. The low-temperature coke oven flue gas desulfurizing and denitrifying process has high desulfurizing and denitrifying efficiency and high SCR catalyst adsorbing rate, and can be recycled, so that the cost is reduced.

Description

[0001] Technical field: [0002] The invention relates to the field of air pollution control, in particular to a coke oven flue gas low-temperature desulfurization and denitrification process. [0003] Background technique: [0004] The fuel produced by the coke oven is mainly coke oven gas or mixed gas (the mixture of coke oven gas and blast furnace gas), and the gas is burned in the coke oven combustion chamber to form coke oven flue gas. The coke oven flue gas is discharged at high altitude through the coke oven underground flue and coke oven chimney under the action of hot pressure and suction of the chimney. Due to differences in coke oven type, fuel type, operating system and other factors, there are also differences in the flue gas volume, temperature, and gas composition of coke oven flue gas. The temperature of coke oven flue gas is generally 180-280°C, which belongs to medium and low temperature flue gas; SO 2 The concentration is generally 200-400mg / Nm 3 , NO X T...

AI Technical Summary

Problems solved by technology

There are many research and development companies, and there are many methods proposed, mainly including the integration of coke oven flue gas low-temperature desulfurization and denitrification, heating coke oven flue gas + high-temperature catalytic reduction denitrification, SICS catalytic oxidation (organic catalytic method) desulfurization and denitrification, activated carbon desulfurization and denitrification and Activated coke desulfurization and denitrification process technology, but the process technology is not very mature, and the treatment process conditions are relatively harsh, and the efficiency is relatively low