Low-temperature flue gas dry desulfurization process for preheating desulfurizer

Abstract

The invention provides a low-temperature flue gas dry desulfurization process for preheating a desulfurizer, and relates to the technical field of flue gas desulfurization. The low-temperature flue gas dry desulfurization method for preheating the desulfurizer comprises the following steps: feeding gas; taking gas; heating: heating the low-temperature gas introduced into a high-temperature flue gas pipeline by a heating device, so that the low-temperature gas is heated to become high-temperature gas; wherein the heating device is a gas-gas heat exchange device, an electric heating device or a hot air heating device; feeding: spraying 600-800-mesh desulfurizer into the middle section part of the high-temperature flue gas pipeline through a weighing feeder, and mixing the desulfurizer with the high-temperature gas; pre-decomposition: mixing high-temperature gas formed by heating with a desulfurizer sprayed into the high-temperature flue gas pipeline, and generating a popcorn type decomposition effect after the desulfurizer reaches a certain temperature; and post-processing. According to the method, NaHCO3 fine powder serving as the desulfurizer is heated in advance to be decomposed, so that the flow of gas needing to be heated is greatly reduced, the energy consumption is reduced, and the efficiency and the applicability and economical efficiency of the process are improved.

Description

technical field [0001] This patent is based on the original application number "202011287153.0" and the name "a kind of preheating desulfurizer containing SO 2 The domestic priority application for the patent of "flue gas dry desulfurization process". The present invention relates to the technical field of flue gas desulfurization, and in particular to the low-temperature flue gas dry desulfurization process of preheating desulfurization agent. 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 (...

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 600-800 mesh) the activity after decomposition is high enough to fix SO 2 The efficiency is high, otherwise, NaHCO 3 Fine powder (mainly 600-800 mesh) cannot be completely decomposed on the one hand, on the other hand, the activity of the part that can be decomposed is low, and the removal of SO 2 The low efficiency will cause NaHCO 3 waste of

[0004] At present, 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 can be completely decomposed before it can be used. As a result, the overall energy consumption of the system has increased, the cost of the system has increased, and the economy of the dry desulfurization process has been reduced. Moreover, the heating device cannot make the heating more uniform, and the heating efficiency needs to be improved.

Images