Single/Double Alkali Wet Flue Gas Desulfurization Technology

Single/double alkali desulfurization technology is a common flue gas desulfurization method, which usually uses sodium alkaline absorbent for initial desulfurization, and then uses lime powder to regenerate the desulfurization liquid. This desulfurization technology is very effective in reducing sulfide emissions in flue gas, and through regeneration steps, it can achieve effective reuse of absorbents, improving environmental protection and economy.

Introduction

Double alkali desulfurization technology first uses a sodium alkaline absorbent to remove sulfur dioxide from the flue gas, then regenerates the desulfurization solution with lime powder. The entire reaction process is carried out between the liquid and gas phases, which avoids scaling problems in the system. The technology boasts high desulfurization efficiency, low liquid-to-gas ratio, high utilization rate of absorbent, low investment cost, and low operating cost. It is suitable for desulfurization of boiler flue gas, coke oven gas, boiler production waste gas, and other sources of flue gas.

Working Principle:

In the double alkali flue gas desulfurization process, flue gas from the calcination furnace is sent to the desulfurization tower by an exhaust fan. The flue gas is fully contacted with aqueous solutions of alkali metal salts, such as NaOH, Na2CO3, NaHCO3, Na2SO3, sprayed inside the tower. The SO2 in the flue gas reacts with the solution, and the absorbed SO2 is then regenerated in the lime slurry reaction tank. The regenerated absorption solution is recycled, while the SO2 is precipitated as gypsum, generating calcium sulfite and gypsum. The actual consumption of desulfurization is Ca(OH)2. The desulfurization reaction takes place in the desulfurization tower, while solid sulfur removal occurs in the circulating water pool.

Process flow：

product-848-532

Technical features

a. There is no corrosion or clogging of pumps, pipes, and equipment, making operation and maintenance easy;

b. The technology avoids tower clogging and wear, improving its reliability and reducing operating costs;

c. Sodium-based absorbents have a fast SO2 absorption rate, so a small liquid-to-gas ratio can achieve a high desulfurization efficiency;

d. The technology is suitable for various small and medium-sized coal-fired boilers and industrial kilns.

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