Multi-layer oblique flow umbrella-shaped water curtain calcium method desulfurization absorption tower and its desulfurization process

Abstract

The invention provides a multilayer diagonal flow type umbrella water curtain calcium process desulfurization absorption tower and a desulfurization technology thereof. A steel cylinder is composed of a tower cylinder cover, a tower cylinder, and a tower cylinder bottom. A layer of resin film is firmly sticked to cover the cylinder inner wall and an overflow ring by a hot-melt technique. A left flue gas pipe and a right flue gas pipe are symmetrically mounted on two sides at the bottom of the cylinder. A wave-absorbing panel is mounted in a limestone absorption liquid at the tower bottom. Three layers of diagonal flow honeycomb tube absorbers are mounted in the tower cylinder. The absorption liquid is introduced into three liquid distributors in the tower cylinder through three branch water inlet pipes of a main water inlet pipe, and is then ejected from scattered umbrella cover nozzles at different heights. A defogging baffle plate is mounted in the absorption tower, and a 1.2-1.8m space is maintained at the top. According to the invention, the mechanical strength and corrosion resistance of the absorption tower are enhanced, the diagonal flow honeycomb tube absorbers reduce airflow resistance, and the umbrella water curtain improves the absorption efficiency, so that the kiln flue gas reaches the emission standard of 180-200mg / Nm3.

Description

technical field [0001] The present invention relates to an improvement of a flue gas desulfurization (FGD for short) equipment after combustion in an industrial kiln—a calcium method absorption tower (Absorption tower), especially suitable for tunnel-type automatic brick-making that uses anthracite or bamboo and wood scraps to burn Furnace flue gas desulfurization process. Background technique [0002] At present, the commonly known flue gas desulfurization technology of absorption tower is the calcium method, that is, the calcium method using CaCO3 (limestone) as the absorbent. This desulfurization process is the most widely used desulfurization technology in the world, accounting for More than 85%, according to the dry and wet state of the absorbent and the desulfurization product in the desulfurization process, the desulfurization technology can be divided into wet method, dry method and semi-dry (semi-wet) method. The wet method FGD technology is made by adding water to ...

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Problems solved by technology

[0002] At present, the commonly known flue gas desulfurization technology of absorption tower is the calcium method, that is, the calcium method using CaCO3 (limestone) as the absorbent. This desulfurization process is the most widely used desulfurization technology in the world, accounting for More than 85%, according to the dry and wet state of the absorbent and the desulfurization product in the desulfurization process, the desulfurization technology can be divided into wet method, dry method and semi-dry (semi-wet) method. The wet method FGD technology is made by adding water to limestone powder The slurry is pumped into the absorption tower as an absorbent to fully contact and mix with the flue gas. The sulfur dioxide in the flue gas reacts with the calcium carbonate in the slurry to generate calcium sulfate. After the calcium sulfate reaches a certain saturation, it crystallizes to form dihydrate gypsum, which passes through the absorption tower The discharged gypsum slurry is concentrated and dehydrated to make its water content less than 10%, and then it is comprehensively utilized. The desulfurized flue gas passes through the demister to remove mist droplets, and then is heated by the heat exchanger and discharged into the atmosphere through the chimney. , because the absorbent slurry in the absorption tower is repeatedly circulated in contact with the flue gas through the circulating pump, the utilization rate of the absorbent is very high, and the desulfurization efficiency can reach about 90%. This method has the advantages of fast desulfurization reaction speed and high desulfurization efficiency. Tower types include rotating spray wheel type, sieve plate type, float valve type, S-shaped flow plate type, tongue-shaped plate type, turbulent ball type, etc., but they generally have complex structures, severe corrosion, and high airflow resistance (tower resistance). , high power consumption, troublesome cleaning, high operation and maintenance costs, etc.

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