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44 results about "Ammonia levels" patented technology

Method and apparatus for estimating the amount of reductant slip in a selective catalytic reduction device

Disclosed is a method and apparatus for estimating the amount of ammonia output from a Selective Catalytic Reduction (SCR) device 20 located in the exhaust system of a vehicle powered by an internal combustion engine. A NOx sensor 44 is located downstream of the SCR to monitor the output of the SCR device and provide data for controlling the dosage of a reductant supplied to the SCR. The NOx sensor is sensitive to NOx which may be output from the SCR when it is under-dosed but is also sensitive to ammonia which may be present when the SCR is over-dosed. Consequently the signal from the NOx sensor is a combination of the NOx and / or ammonia levels in the exhaust. The method and apparatus for estimating the amount of ammonia output from the SCR determine a NOx conversion efficiency of the SCR using a variance of a NOx input measurement from a NOx sensor 42 located upstream of the SCR and a variance of a NOx output measurement from the NOx sensor 44 located downstream of the SCR. An estimate of the actual NOx output from the SCR is then determined using the measured NOx input value and the NOx conversion efficiency of the SCR. The resulting estimate of NOx output is used in conjunction with the measured NOx output to determine the ammonia output by subtracting the estimated NOx output from the measured NOx output to provide an estimate of the ammonia output.
Owner:PERKINS ENGINES

Method for recycling ammonia gas in exhaust gas

The invention discloses an ammonia recovery device in waste gas, which comprises an ammonia washing tower, the bottom of the ammonia washing tower is a base, a manhole is arranged on the base, a storage area is arranged above the base, an absorption area is arranged above the storage area, and an absorption area is arranged above the storage area. A spraying device is provided above the spraying device, and the first flue gas outlet is provided on the wall of the ammonia washing tower above the spraying device, and a chimney is provided on the top of the ammonia washing tower. Packing support plates are provided, and each packing support plate is provided with a plurality of holes, the bottom of the absorption area is provided with a flue gas inlet, and a liquid level gauge is provided on the wall of the ammonia washing tower outside the absorption area. An ammonia water outlet is provided at the bottom of the area, and the ammonia water outlet is connected to the soft water source, the ammonia water storage device and the spray device of the ammonia washing tower, and a pump is arranged between the ammonia water outlet and the spray device. The invention has reasonable design, the ammonia-containing waste gas passes through the ammonia washing tower to recycle the ammonia gas, can improve the ammonia recovery rate, and has the advantages of no pollution and zero discharge to the waste gas.
Owner:HENAN ZHONGHONG GRP COAL
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