Continuous isokinetic sample device for stack gas having suction nozzle to which sectional area control device is attached, and automatic continuous measurement system for fine dust in stack gas comprising same combined therewith

A continuous isokinetic sampling device of a stack gas, characterized by comprising

• a suction nozzle configured to suck the stack gas within a stack;
• a nozzle cross-sectional area control knob provided outside and at a front end of the suction nozzle;
• a particle size separation device arranged outside the stack and configured to separate and sample a fine dust from the stack gas sucked by the suction nozzle;
• and
• a knob position control device arranged outside the stack and configured to control a position of the nozzle cross-sectional area control knob provided at the front end of the suction nozzle;
• wherein an opening at the front end of the suction nozzle has an oval race track shape when viewed from a stack gas flow direction, and the nozzle cross-sectional area control knob is provided at the front end of the suction nozzle,
• the nozzle cross-sectional area control knob has a semicircle shape formed inwardly toward a center thereof at one end when viewed from the stack gas flow direction,
• the knob position control device maintains an isokinetic suction with a flow rate of the stack gas within the stack, simultaneously with implementing a constant suction required by the particle size separation device, by controlling the position of the nozzle cross-sectional area control knob to selectively cover a portion of the opening, and adjusting a cross-sectional area of the opening where the stack gas is flown through by means of a position control slide lever.