Dust level detection at the inlet of the three-spinning unit and the exhaust fan in the catalytic device
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Dust level monitoring at the inlet of the catalytic unit’s three spinners and at the exhaust fan inlet: Does everyone’s unit have an online monitoring system, and are the values provided by it accurate? We have them, but the values are not accurate. 2. Are there external inspectors who conduct tests for you, and how often? An external party conducts inspections for us every quarter; if the operation is unstable, inspections can be carried out at any time
Without online monitoring; monitoring is carried out once a week
We have reserved ports for dust monitoring; P
Regarding online monitoring: Online monitoring may provide more accurate data on particulate matter in catalytic flue gases, as it helps to avoid the issues associated with offline sampling, such as the inability to obtain genuine samples and sample contamination. It is still very difficult to achieve complete sampling at a constant rate offline. Moreover, there is a high risk of sample contamination; for example, dirt accumulated at the sampling port can enter the sampler when it is inserted, and scale attached to the inner walls of the filter tank can enter the tank when it is installed or removed, among other such situations. But there are still no fully reliable instruments for straight-line detection; maybe they exist, but I’m not aware of them. 1. Laser type: It is said that there is no reliable theoretical basis for this; lasers undergo diffraction when passing through particles, and the greater the number of particles, the larger the diffraction angle. The concentration of particles is calculated using empirical formulas based on this diffraction angle. The diffraction angle of light alone cannot be used to accurately determine the particle concentration; a known concentration at a specific point is required (for calibration) in order to adjust the parameters of the empirical formula. To measure the diffraction angle of light, the pipe opening must be large, and the connecting tube cannot be too long; as a result, the sight glass glass tends to get dirty easily. Furthermore, the particle concentration changes significantly, making it impossible to measure accurately. 2. Visible light: When light passes through particles of different sizes, it is absorbed to varying degrees by light waves of different wavelengths. By comparing the different wavelengths of light, N sets of equations (one set for each wavelength) are solved to determine the particle size distribution and particle concentration. And a laser has a single wavelength. No calibration is required; measurement can be done directly. 3. A target-type system: A target is inserted into the flue gas duct; particulate matter hits this target, generating vibrations. These vibrations are transformed into waves, which are then processed to determine the mass of the particles, allowing for their counting. No calibration is required; particle size and concentration (number of particles) are obtained directly. The actual measured particle size is more important than concentration; it are the large particles that can cause damage to the smoke extractor.
Are there any companies that offer external testing? Could you provide the contact information?
Which company are you from? There are many such testing agencies in our area in Shandong. If you need it, feel free to message me privately
We plan to install an online particle size and concentration detector, which costs around 150,000 yuan.
Is this instrument not expensive to buy, but has high maintenance costs later on?
Our device is online, but the values are inaccurate. Three-spin inlet 400, exhaust fan inlet 300. Multiple attempts to process the instrument were ineffective. We have external testing done once a month. Over 180 last month
We are using the TSM-NET-1 type online monitoring system for particle concentration and particle size here. After several years of use, it provides stable measurements, is easy to maintain, and its readings are fairly accurate compared to those obtained through manual sampling; it is highly reliable! Date Time TSM Instrument Manual Sampling Concentration (mg/m3) Median Diameter μm Mean Diameter μm 0–5 μm 5–10 μm >10 μm Concentration (mg/m3) Median Diameter μm Mean Diameter μm 0–5 μm 5–10 μm >10 μm 2009.4.21 9:50 141 1.47 1.36 94.02 5.97 0.01 172 1.29 0.70 94.4 5.4 0.2 2009.4.23 9:40 141 1.49 1.38 93.93 6.06 0.00 141 1.36 1.00 100 0 0 Statistical Average
Do your spare parts break down frequently? Are the maintenance costs high?