Method for extinguishing dry-method activated coke desulfurization adsorbent bed

Abstract

The invention discloses a method for extinguishing a dry-method activated coke desulfurization adsorbent bed, comprising the following steps of: mounting a low-pressure steam tube near a desulfurization adsorbent bed, connecting into low-pressure steam and mounting a control valve on the low-pressure steam tube; mounting a steam spray head on each layer of adsorbent bed of each desulfurization tower; when in normal operation, opening a flue gas control valve and closing the steam control valve; when the adsorbent bed is fired, immediately closing the flue gas control valve and cutting off flue gas blast, then opening the steam control valve, introducing low-pressure saturated water steam which quickly fill with the whole space of an adsorbent bed layer and isolating oxygen so as to quickly extinguish the fire; and exhausting the extinguished residual gas out of a chimney through an air outlet flue. The invention has the advantages that: (1) the wasted low-pressure saturated water steam used as an extinguishing agent is easily-obtained and low in cost; (2) the steam and coke at the combusted part are subjected to the endothermic reaction so as to stop the combustion; (3) the water steam has favorable distribution property and is easy to reach the firing area; and (4) residual oxygen can be quickly repelled by using the water steam, and the combustion can be inhibited by isolating the oxygen.

Description

【Technical Field】 [0001] The invention relates to flue gas desulfurization, and further relates to a dry-process activated coke flue gas desulfurization technology, and specifically relates to the ignition treatment of a dry-process activated coke flue gas desulfurization adsorption bed. 【Background technique】 [0002] The dry activated coke desulfurization device is designed to remove SO from the exhaust gas of power plant boilers or sulfuric acid production device tail gas. 2 , SO in the flue gas adsorbed by activated coke 2 Exothermic reaction will occur when the activated coke has a low ignition point, which is a flammable solid, improper operation control or SO in the exhaust gas 2 When the concentration fluctuates greatly, the adsorption bed will catch fire. If the fire protection measures are not proper, the entire adsorption bed will burn rapidly in a large area and emit high heat, which will destroy the adsorption desulfurization tower. [0003] The current fire extinguishi...

AI Technical Summary

Problems solved by technology

[0003] At present, the fire extinguishing method after the adsorption bed catches fire is water spraying. This method mainly has the following disadvantages: ①The ignition point first occurs in the local area of ​​the adsorption bed, and the water spraying point is mostly a fixed point, so the water spraying does not occur when the water spray valve is opened after the fire occurs. It must be able to spray to the actual ignition point, and it is difficult to achieve the purpose of fire extinguishing; ②Since the activated coke will generate adsorbed sulfuric acid after absorbing SO2 in the flue gas, and when the activated coke containing adsorbed sulfuric acid is sprayed with water, the water will dissolve part of the sulfuric acid and Dilute acid is produced, and the acidic wastewater will seriously corrode the metal of the adsorption bed and the concrete frame, causing damage

[0004] Among the Chinese patent applications, only No. 200910020685.5 "A Vacuum Pressure Swing Adsorption Oxygen Production Device Can Simultaneously Use Full Oxygen and Oxygen-enriched Combustion-Supporting Energy-saving Device" involves desulfurization adsorption bed, but does not involve the fire extinguishing method after it catches fire; another No. 200710029512.0 "Heat Energy Recovery System of Adsorption Bed" mentions the heat energy of the adsorption bed, but still does not involve the fire extinguishing method after it catches fire