3 results about "Mercury level" patented technology

The application discloses a kind of determination early warning method, system and storage medium of mercury content in food raw materials, it is related to food safety detection technical field, comprising: obtaining the surface enhanced Raman spectrum of food raw material sample, and pretreatment and data enhancement, extract the spectral feature of enhanced Raman spectrum data, optimally generate spectrum feature with the best spectral feature combination, extract feature parameter combination based on spectrum feature, the data set is constructed with different concentration mercury content sample synthesis;Establish identification determination model, train using data set, collect the surface enhanced Raman spectrum of food raw material to be detected, extract spectrum feature as model input and carry out qualitative, quantitative analysis of mercury content;When quantitative analysis result in mercury content concentration is greater than preset mercury content threshold value, then generate abnormal early warning information.The application utilizes surface enhanced Raman spectrum to construct the rapid detection method of mercury content in food raw materials, improves the accuracy of mercury content determination.

This invention discloses a control system and method for reducing mercury emissions from cement kiln dust collector ash discharge. A flue gas mercury analyzer installed on the chimney measures the mercury concentration in the flue gas and transmits the data to a computer. When the mercury concentration in the flue gas is lower than the environmental standard, the dust collector ash is not discharged. When the mercury concentration in the flue gas is higher than the environmental standard, the computer controls relevant equipment to discharge the dust collector ash to reduce the mercury concentration in the chimney. Solid powder samplers installed in the ash hopper of the baghouse dust collector and on the raw material elevator take samples at regular intervals and send them to a solid mercury analyzer. The solid mercury analyzer transmits the mercury content of the dust collector ash and the mercury content of the raw material entering the kiln to the computer. By comparing the input and output mercury levels, the computer calculates the amount of dust collector ash to be discharged. The computer then controls a bidirectional screw conveyor to transport the dust collector ash to a temporary storage silo via a second belt conveyor according to the calculated discharge amount, thereby reducing the mercury emission concentration from the chimney.

The invention discloses a portable mercury content detection device, and relates to the field of mercury content detection. The portable mercury content detection device comprises a detector and a pretreatment unit arranged on one side of the detector, the detector detects the mercury content by measuring the light intensity weakening degree through a cold atomic absorption spectrometry, the pretreatment unit comprises a drying assembly and a flow rate adjusting assembly, and the drying assembly can adjust the content of a drying agent according to the humidity of mercury gas; the flow rate adjusting assembly adjusts the mercury steam flow rate according to the drying agent content. According to the portable mercury content detection device, by arranging the drying assembly, the number of drying agents can be adjusted according to the humidity of mercury steam, so that water vapor in the mercury steam can be effectively removed, and the influence of humidity on a detection result is avoided. Meanwhile, the flow speed adjusting assembly can correspondingly adjust the flow speed of mercury steam according to the number of the drying agents, dilution of the mercury steam is reduced, it is guaranteed that the sensitivity of the detector to the mercury steam is stable, and the detection accuracy is further improved.