Method for treating organic waste gas in chemical plant

Abstract

The invention discloses a method for treating organic waste gas in a chemical plant. The organic waste gas sequentially pass through a flowmeter, a flow regulating valve, a concentration monitor, a dust removal flame-retardant device, an air inlet fan, a heat exchanger, a catalyst chamber, an exhaust fan, an alkaline tower, a humidifier, a biological active packing layer containing scrap iron, a 1# electrode, a 2# electrode, a 3# electrode, a 4# electrode, a circulating water system, a thermostat, a spraying system, a three-way valve and a biological filter. According to the method, the concentration of the organic waste gas can be regulated into a proper concentration range of the waste gas treatment system. According to the method, different waste gas treatment methods can be selected according to the concentration of the organic waste gas. In the biological treatment section of the method, acidic substances in the waste gas are removed by adopting an alkali washing method, and the condition that the biological activity is influenced in the biological filter is avoided; and in the biological treatment section of the method, the scrap iron is contained in the packing, the packing is stirred periodically by utilizing the variable electrode magnetism, the phenomena that the gas flow is influenced due to blockage and the reaction is non-uniform are avoided, a stirrer can be replaced, and the inner reaction space is saved.

Description

technical field [0001] The invention relates to a method for treating organic waste gas from a chemical plant, belonging to the field of waste gas treatment in environmental protection. Background technique [0002] Volatile organic compounds, referred to as VOCs, are any organic compounds with a boiling point lower than 250°C under normal pressure, or all organic compounds emitted into the air in the form of gaseous molecules at room temperature (25°C) with a saturated vapor pressure exceeding 133.32Pa. The general term for compounds, including 8 types of alkanes, aromatic hydrocarbons, alkenes, halocarbons, esters, aldehydes, ketones and other compounds. In addition to producing ozone pollution, VOCs form secondary organic aerosols (25~35%). VOCs have become the decisive precursors of urban photochemical smog in my country, reducing particulate pollution, removing photochemical smog, improving urban air quality, and controlling VOCs. It is imperative. At present, the comm...

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Problems solved by technology

[0005] 3. When using the method of biological filter box to treat organic waste gas, after a period of reaction, if the filling in the box is not stirred, blockage will easily occur, affecting the flow of gas, and the phenomenon of uneven reaction will occur, and setting the agitator will increase the filter capacity. Box volume, expansion cost

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