摘要:
A method of properly spraying a powdered reactant for treating an exhaust gas. Specifically, a method of spraying a powdered basic absorbent and a powder adsorbent as powdered reactants into an exhaust gas so as to remove noxious substances from an exhaust gas discharged by combustion and heating, wherein a mixture of activated carbon with an assistant is used as the powder absorbent. A powdered basic absorbent, for example, slaked lime is supplied from a slaked lime supply unit (6), and a powder adsorbent from a mixture supply unit (7), after activated carbon and the assistant have been mixed therein, to a flue (5).
摘要:
A combustion control method for refuse incinerators stabilizes a burning state to generate a predetermined amount of steam in a refuse incinerator which makes use of heat of combustion for steam power generation. The method comprises determining a weight of refuse charged and a level change before and after the charging of refuse from measurements of a refuse load cell attached to a refuse charging crane and a refuse level meter (12), which measures a surface level of refuse in a refuse incinerator hopper, to control a speed of a drying fire grate (3a), which serves to feed refuse into the incinerator, based on a result of comparison between quantities determined in a plurality of preceding charges and the quantities determined at the present time. Also, the method comprises measuring a quantity of steam generated in the refuse incinerator and an O2 concentration in an exhaust gas, calculating a target quantity of combustion air required for having the generated steam quantity agree with a target quantity of steam generated, setting a target quantity of combustion air, when a measurement of O2 concentration in the exhaust gas first reaches a predetermined upper limit value, as a temporary set quantity of combustion air, controlling a quantity of combustion air so as to have the same agree with the target quantity of combustion air when the measurement of O2 concentration in the exhaust gas is equal to or less than the upper limit value, and controlling a quantity of combustion air so as to have the same agree with a smaller one of the target quantity of combustion air at that time and the temporary set quantity of combustion air when the measurement of O2 concentration in the exhaust gas exceeds the upper limit value.
摘要:
A combustion control method for waste incinerators, developed for the purpose of reducing the concentrations of CO and NOx in a waste gas and a generation rate of dioxine. The condition of the waste on a post-combustion fire grate (3c) is judged on the basis of measurement values on a main flue thermometer (14), an O2 analyser (16), a CO concentration meter (17) and a barometer (18a) which is set under the post-combustion fire grate. Thus, the possibility that the apparatus will get into an insufficient temperature condition, or an air or fuel shortage condition is judged quickly, and the flow rate of the air to the post-combustion fire grate (3c), or the flow rate of the air to the same fire grate (3c) and the moving speed of the fire grate are controlled.
摘要:
An incinerator for restricting the occurrence of dioxins characterized by comprising a burning furnace (11) for burning inflammables thereinside in combustion air, means (12) for measuring chlorinated aromatic compounds, which measures the quantities of chlorinated aromatic compounds generated inside the burning furnace (11), and control means (14, 15, 16) for monitoring the quantities of the generated chlorinated aromatic compounds obtained by the measurement means (12) and changing the operating condition of the burning furnace (11) on the basis of the monitor result, so that the quantities of the generated chlorinated aromatic compounds are reduced inside the burning furnace (11).