Online particulate matter concentration monitoring method and system and method for judging leakage of cloth bag
A particle concentration and monitoring system technology, applied in particle suspension analysis, measurement device, suspension and porous material analysis, etc., can solve the problem of difficult to accurately simulate non-equilibrium velocity field and uneven velocity field
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Embodiment 1
[0047] Embodiment 1: a kind of online monitoring method of particle concentration, see figure 1 , figure 2 , image 3 ;it includes:
[0048] 1) Obtain the induced current and noise signals in the flue through the probe;
[0049] 2) Input the acquired induced current and noise signal into the band-pass filter for noise reduction; step 2) specifically: carry out band-pass Butterworth filter filtering on the collected data, wherein the band-pass Butterworth filter filters The order is 2-8 order.
[0050] 3) Input the induction signal and noise signal after the noise reduction by the band-pass filter to the signal conditioner for separation;
[0051]4) Input the sensing signal separated by the signal conditioner into the signal processor for data processing and calculate the particle concentration data.
[0052] When processing the signal collected by the probe, any signal can be regarded as the superposition of useful signal and noise signal, and the expression formula is a...
Embodiment 2
[0072] Example 2, see figure 1 , a particulate matter online monitoring system, for implementing the method described in embodiment 1, it comprises:
[0073] A probe, the probe is in the shape of a metal rod or rod, the probe can be inserted into the flue and collect the induced current of the particles and the noise signal in the flue;
[0074] A band-pass filter is electrically connected to the detection rod and obtains the induced current and the noise signal to reduce noise;
[0075] A signal modulator, connected to the band-pass filter to obtain the induction signal and the noise signal after the noise reduction by the band-pass filter and separate the two;
[0076] The signal processor is connected with the signal modulator and performs data processing on the sensing signal to obtain the concentration signal of the particulate matter.
[0077] like figure 1 As shown, the present invention adopts an insulated metal probe to be inserted into the flue to be tested, colle...
Embodiment 3
[0080] Embodiment 3, a kind of method for judging bag leakage, see Figure 5 .
[0081] like Figure 5 As shown, the detected peak quickly reaches the highest point and then drops slowly. After the bag is backflushed, the escape concentration of particulate matter rises rapidly and then decreases slowly. The particulate matter has an escape process. The ability is also significantly enhanced. After the bag is backflushed, the particle concentration gradually decreases to close to 0 value, and the backflush is performed again, and the previous rule is reproduced. Therefore, this method includes:
[0082] 1) Establish the function f(x1, x2, x3) after backflushing of the normal bag filter, see Figure 5 , where x1 is the time from when the bag is blown back to the peak value, x2 is the peak span time of the rising time, x3 is the time when the peak reaches the peak, and x4 is the time of a blowback cycle;
[0083] 2) Collect the real-time data curve of the current particulate ...
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