Absorption tower for wet desulfurization by calcium method

Abstract

The invention discloses an absorption tower for wet desulfurization by a calcium method. The absorption tower comprises a tower body. A slurry pond, a gas cap layer, a plurality of main spray absorption layers and a plurality of demister layers are sequentially arranged inside the tower body from bottom to top; a flue gas outlet is formed in the top of the tower body, and a flue gas inlet is formed in space between the slurry pond and the gas cap layer; the slurry pond is divided into a thin slurry pond and a thick slurry pond by a partition plate, and the thin slurry pond is closed; a cooling concentration spray layer is arranged between the slurry pond and the gas cap layer, and a sprayer on the cooling concentration spray layer is communicated with the thick slurry pond via a cooling concentration circulating outlet pipeline; a gypsum slurry discharge outlet is formed in the thick slurry pond; the thin slurry pond is connected with sprayers of the main spray absorption layers via a main absorption circulating outlet pipeline; the gas cap layer is connected with the thin slurry pond by a connecting pipe. The absorption tower has the advantages that the absorption tower is quite favorable for absorbing sulfur dioxide of flue gas, the desulfurization efficiency can be greatly improved, a designed liquid-gas ratio can be greatly reduced under the same condition, and accordingly running power consumption of a circulating pump can be reduced.

Description

technical field [0001] The invention relates to a desulfurization absorption tower. Background technique [0002] The flue gas desulfurization absorption tower is the most critical device in the flue gas desulfurization process. The rationality of the structure design of the absorption tower is directly related to the desulfurization efficiency, desulfurization agent utilization rate, nitrite oxidation efficiency and device energy consumption. In the calcium desulfurization process, because the slurry contains more solid substances, it is easy to scale and deposit, so the spray empty tower is often used. The characteristics of the spray empty tower are that the system is not easy to scale and block, and the flue gas pressure drop is small, but the temperature of the flue gas entering the desulfurization tower is relatively high (if no GGH is set, the flue gas temperature is generally ≥130°C), and the flue gas is cooled The absorption of sulfur dioxide is carried out in the...

AI Technical Summary

Problems solved by technology

[0004] In addition, the oxidation of the intermediate product calcium sulfite will become more difficult as the slurry density increases, and the oxidation effect of calcium sulfite is relatively poor when operating under the condition of higher slurry density. Cover some unreacted desulfurizers, which will directly affect the quality of desulfurized gypsum

Images