Device for Spraying an Ammonia Gas in an Automatically-Adjusted Manner Based on a Flow Rate of a Flue Gas and a Method Thereof

A device for spraying an ammoniacal gas in an automatically-adjustable manner based on a flow rate of a flue gas, wherein the device is placed in a gas funnel full of the flue gas flowing along a first direction, wherein the device comprises:

• a housing, along the first direction provided with an inlet receiving the ammoniacal gas and an opposite outlet spraying the ammoniacal gas;
• a force suffering plate, arranged outside the housing and opposite to the outlet, and configured to suffer impact from the flue gas and the ammoniacal gas;
• a baffle, arranged at an inner wall of the housing and forming an aperture that allows the ammoniacal gas to pass through;
• a base, arranged at the inner wall of the housing and away from the outlet relative to the baffle;
• and
• an adjustable assembly, comprising a pull shaft, a sliding block, and an elastic element,
• wherein
• the sliding block is arranged inside the housing and movably inserted into the aperture,
• the sliding block is of an increasing cross-section along the first direction,
• the sliding block is connected to a first end of the pull shaft and a first end of the elastic element at its two opposite ends, respectively,
• a second end of the pull shaft is connected to the force suffering plate,
• a second end of the elastic element is connected to the base,
• the sliding block is configured to be moved along with the force suffering plate through the pull shaft under the impact onto the force suffering plate by the flue gas,
• in response to an increasing flow rate of the flue gas that results in a first force onto the force suffering plate being greater than a second force generated by the elastic element, the sliding block is pulled towards the outlet, enabling an increasing volume of the ammoniacal gas to flow through the aperture,
• in response to a decreasing flow rate of the flue gas that results in the first force onto the force suffering plate being lower than the second force generated by the elastic element, the sliding block is pulled towards the inlet, enabling a decreasing volume of the ammoniacal gas to flow through the aperture, and
• in response to a balancing flow rate of the flue gas that results in the first force onto the force suffering plate being equal to the second force generated by the elastic element, the sliding block stands still, enabling a constant volume of the ammoniacal gas to flow through the aperture.