Coke oven coal charging, coke discharging and dust removing flue gas desulfurization system

Abstract

The invention discloses a coke oven coal charging, coke discharging and dust removing flue gas desulfurization system. Coke oven coal charging, coke discharging and dust removing flue gas enters a low-temperature flue gas main pipeline; part of the low-temperature gas enters a high-temperature flue gas pipeline; the low-temperature gas introduced into the high-temperature flue gas pipeline is heated; a desulfurizing agent is sprayed into the middle section of the high-temperature flue gas pipeline through a weighing feeder; high-temperature gas formed by heating is mixed with the desulfurizing agent, and after the desulfurizing agent reaches a certain temperature, a popcorn type decomposition effect is generated; and mixed gas of the high-temperature gas and the pre-decomposed desulfurizing agent is fed into a low-temperature flue gas main pipeline through a wear-resistant conveying fan, is mixed with coke oven coal charging, coke discharging and dust removing flue gas in the low-temperature flue gas main pipeline, and then sequentially enters a desulfurizing tower and a bag-type dust remover. Air volume control and temperature control are easy and convenient, control and operation of an engineering field are facilitated, abrasion to the centrifugal fan is reduced, the flow of gas needing to be heated is reduced, energy consumption is reduced, and efficiency and applicability and economical efficiency of the process are improved.

Description

technical field [0001] The invention relates to the technical field of desulfurization technology, in particular to a flue gas desulfurization system for coke oven charging and discharging coke and dust removal. Background technique [0002] SO 2 It is the main component of air pollution, composed of SO 2 Acid rain, industrial smog and other problems caused by excessive emissions pose a serious threat to the ecosystem and human health, restricting the development of society. For this reason, the country has issued strict emission standards, and enterprises have also increased investment in flue gas desulfurization treatment. . [0003] Sodium-based dry desulfurization process is based on NaHCO 3 As desulfurizer, NaHCO 3 The fine powder (mainly 500-800 mesh) is sprayed into the high-temperature flue gas, the desulfurizer is mixed with the flue gas, and the NaHCO 3 Fine powder (mainly 500-800 mesh) decomposes rapidly to form Na 2 CO 3 Particles, through Na 2 CO 3 and ...

AI Technical Summary

Problems solved by technology

However, this process requires that the temperature of the flue gas must be guaranteed to be above 170°C to ensure that NaHCO 3 (mainly 500-800 mesh) the activity after decomposition is high enough to cure SO 2 The efficiency is high, otherwise, NaHCO 3 Fine powder (mainly 800 mesh) cannot be completely decomposed on the one hand, and on the other hand, the activity of the part that can be decomposed is low, so the removal of SO 2 The low efficiency will cause NaHCO 3 waste of

Therefore, the engineering application scenarios of the sodium-based dry desulfurization process are limited: it can only deal with high-temperature flue gas, and for low-temperature flue gas, it is often necessary to reburn blast furnace gas to heat the mixed flue gas, so that the desulfurizer is completely decomposed and then desulfurized. Play a role, resulting in an increase in the overall energy consumption of the system, increasing the operating costs of the system, and reducing the economics of the dry desulfurization process

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