The gas concentration fluctuates greatly. Should the chemical filter be selected based on the average value or the short-term peak value?

When the gas concentration fluctuates greatly, the average cumulative load and short-term peak value should be considered at the same time. The average data helps estimate media consumption, while the peak value and duration are related to export control. Only one of them cannot be used to replace all selection conditions. The selection of fluctuating loads requires looking at two dimensions at the same time.

1. Define representative statistical periods

Operating hours, air volume and outage background will change the average. Typical operations and pollution events should be retained to avoid long-term low loads covering actual usage needs.

The average value reflects the long-term cumulative load and is suitable for estimating the capacity consumption and replacement cycle of the filter material. But if the average is pulled down by a long period of low load, short-term high-concentration events may be masked. The statistical period should cover typical production shifts, cleaning operations and seasonal changes, rather than just taking data from a smooth period. Aili Industry isa chemical filter, confirm the media configuration according to the gas load characteristics.When selecting FFU chemical filters can be used with circulation systems to handle fluctuating loads. The relationship between levels and filtering requirements can be found inISO cleanliness level comparison。

2. Evaluate abnormal releases separately

The response tasks for routine filtration and accidental releases are different. Source control, ventilation and monitoring should be checked, and abnormal situations cannot be handled based on daily average load.

Short-term peaks may result from cleaning, material replacement, equipment startup, or abnormal emissions. The peak concentration is high and the duration is short, and the impact on the outlet concentration depends on the instantaneous efficiency of the filter and the dilution capacity of the system. If the peak value exceeds the design range, even if the average load meets the requirements, the outlet may exceed the standard for a short time. Aili Industry isbox chemical filters andthe V-type chemical filter, check the media capacity and resistance according to the peak load.When matching Flat chemical filters are suitable for local treatment at the equipment end. For the trade-off between peak and average load, please refer toHEPA FAQs and Selection Guide。

3. Examples of project judgment

When there are short-term high loads during daily cleaning, daily consumption can be estimated separately and the outlet performance during the cleaning phase can be verified.

When daily cleaning produces short-term high-concentration gas, the daily average concentration may not be high, but the outlet concentration during the cleaning stage needs to be verified separately. The filter material capacity is estimated based on the average load, and the outlet control is checked based on peak conditions. Only a combination of the two can cover the actual working conditions.

4. Application Check Points

5. Verification and subsequent use

Sampling and investigation need to correspond to actual usage conditions. Keeping records of the occurrence period, source events, ventilation and environment can help determine whether the data is representative. Unknown components should be listed as items to be confirmed and completed through appropriate testing, and limited information should not be expanded into all air conclusions.

Aili Industry isIn the chemical filter fluctuation load plan, the average consumption and peak outlet are checked separately. The specific effect is subject to on-site testing. The chemical filter FFU can be used in the circulation system to evaluate peak performance in conjunction with monitoring data.

6. Related questions and answers

Is it possible to select based on average concentration?
not enough. The average value is suitable for estimating capacity consumption, but short-term peak values ​​may affect the outlet concentration and require separate verification.

The peak duration is short, does it need to be considered separately?
need. Even if the duration is short, if the peak concentration is high, the outlet may still exceed the standard for a short time, and the performance of the system under the peak should be confirmed.

Which is more important, average or peak?
Both answer different questions. The average value is used for capacity and replacement cycle, and the peak value is used for outlet control and system margin, and cannot be replaced by each other.

7. Related articles

Chemical filter product series

FFU chemical filter

Box chemical filter

HEPA FAQs and Selection Guide

What is a chemical filter FFU? The main difference from ordinary FFU?

8. Key points for selection and acceptance inspection

9. Aili Industrial products and equipment supporting equipment

Aili Industry provides chemical filters and clean air supply equipment selection packages. It can compare FFU package, box type, flat type and V-shaped products according to gas composition, treatment air volume and installation conditions. The manufacturing and supporting system covers the independent research and development and production of motors and fans, control systems, sheet metal, air filters and complete machine assembly, making it easy to jointly confirm the filter section, power and structural conditions. The specific gas effect, environmental suitability and service life still need to be verified based on the corresponding configuration data and actual working conditions.

learnChemical filter product series , check the products and air supply matching according to the project conditions. Clarify the goal → Check the conditions → Verify the effect → Arrange maintenance.