Closed multi-stage water curtain desulfurization system

Abstract

The present invention discloses a closed multi-stage water curtain desulfurization system. The multi-stage closed water curtain desulfurization system comprises a boiler, a tower drum and a support, wherein the boiler is connected with the tower drum through a pipeline; a smoke inlet is formed in the lower part of the tower drum; a circulating water spray pipe is arranged at the upper part in the tower drum; a smoke discharging channel is formed in one side of the tower drum; a smoke outlet is formed in the smoke discharging channel; a demister is arranged at the upper part in the tower drum, and a water distribution disc is arranged below the demister; a stand column is arranged in the middle of the tower drum and provided with more than two stages of water curtain caps, and the water curtain caps are arranged at intervals from top to bottom; more than two layers of water collection discs are arranged at intervals on the two sides of the inner wall of the tower drum from top to bottom; a drain outlet is formed in the bottom of the tower drum and communicated with a sewage treatment tank. The facts that the flue gas of the boiler can reach the emission standard and the desulphurization efficiency is high are ensured, and meanwhile, the removal of desulphurized sewage and the circulating utilization of water resources are achieved, so that the water resources are saved.

Description

technical field [0001] The invention relates to a coal-fired boiler desulfurization system, in particular to a closed multi-stage water curtain desulfurization system. Background technique [0002] Coal-fired boilers and kilns emit more than 400 million tons of smoke and dust every year, which makes the environment on which human beings depend sharply worse. The technology of desulfurization and dust removal of smoke and dust has attracted more and more attention. At present, the methods of flue gas desulfurization include dry flue gas desulfurization process, spray dry flue gas desulfurization process, fly ash dry flue gas desulfurization technology, wet flue gas desulfurization process, etc., wet flue gas desulfurization process, form Similar to the mechanism, it mainly uses limestone (CaCO3), quicklime (CaO) or sodium carbonate (Na2CO3) as a detergent to wash the flue gas in the reaction tower to remove SO2 in the flue gas. This process has a history of 50 years. After c...

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Problems solved by technology

[0003] In the wet method, water curtain desulfurization is a widely used method. Chinese Patent No. ZL200820078306.9 discloses a tower type water curtain desulfurization and dust removal device. The multi-stage water curtain cap and dehydration cap can make the sulfur-containing flue gas and desulfurization agent-containing spray water fully contact, fuse and collide at multiple levels during the diffusion and flow process along the water curtain cap and dehydration cap, greatly improving The spray water can remove the harmful substances in the flue gas, and the ideal desulfurization and dust removal effect can be obtained. However, the water curtain cap and the dehydration cap of the device are concentrated in the center of the tower body cavity, and the flue gas flows along the wall of the tower body cavity. When flowing, it is not effectively blocked, so the effect of dissolving water and dehydration on this part of the smoke is reduced, and harmful substances still have the possibility of escaping, and the desulfurization effect is not ideal

[0004] Chinese Patent No. CN201454328 U discloses a tower-type energy-saving and high-efficiency desulfurization device. The device arranges multi-layer water collecting trays at intervals from top to bottom on the wall of the water curtain tube, and spaced from top to bottom on the wall of the dehydration tube. There are multiple layers of dewatering plates, the water collecting tray and the dewatering plate are ring-shaped, and the outer edges are closely connected with the water curtain tube and the wall of the dewatering tube, and the middle is a round hole through which the flue gas and water flow pass. The installation position of the board is respectively under each layer of water curtain cap and dewatering cap. The smoke and dust flowing on the wall can be effectively blocked, which increases the contact area of ​​the smoke and dust in water and dehydration, and improves the desulfurization effect. However, the water curtain formed by the water curtain cap directly hits the water collecting pan, and it will be left directly, and it cannot form a dense The flue gas will still pass through the water curtain, resulting in incomplete desulfurization

[0005] Similarly, Chinese Patent No. CN201454329 U discloses a multi-stage water curtain desulfurization and dedusting tower. Although the device has added a water collecting tray in the tower, it can effectively block the smoke and dust flowing along the wall of the cylinder, and increase the amount of water that dissolves the smoke and dust. However, the water curtain formed by the water curtain cap directly hits the water collecting pan, and it will be left directly, and a dense water curtain cannot be formed, and the flue gas will still pass through, resulting in incomplete desulfurization

[0006] Moreover, in recent years, with the enhancement of environmental protection awareness, my country's environmental standards have been continuously improved, and more stringent standards have been implemented for the emission of air pollution from industrial furnaces and boilers. The existing desulfurization devices cannot meet the new emission standards, and the desulfurization effect needs to be further improved.

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