CNC (Computer Numerical Control) workshop is an advanced work environment for machining and manufacturing that uses computer-controlled machine tools to precisely cut, engrave, drill, and machine a variety of materials. However, exhaust fumes from these processes can pose a potential threat to the environment and employee health. CNC workshop exhaust gas refers to the gas emissions containing pollutants and harmful substances generated during CNC workshop operations.

The composition of CNC workshop exhaust gases can vary depending on the materials used, cutting fluids, process parameters and type of machining.

Common CNC Shop Exhaust Gases Include:

• Particulate Matter: During processing, the material may generate particulate matter such as metal dust, swarf, etc. These particles may contain harmful metals and compounds that pose a risk to the respiratory system and the environment.

• Volatile organic compounds (VOCs): Evaporation of cutting fluids, thermal decomposition during material processing, etc. may produce VOCs, such as benzene, formaldehyde, acrylic acid, etc. VOCs are one of the main sources of air pollution and are harmful to human health and air quality.

• Nitrogen oxides (NOx): During high temperature processing, nitrogen in the air reacts with oxygen to form NOx, such as nitric oxide (NO) and nitrogen dioxide (NO2). NOx is harmful to the environment and can cause acid rain and ozone depletion.

• Sulfides: If the CNC workshop uses sulfur-containing cutting fluids, sulfide gases, such as hydrogen sulfide (H2S), may be produced during machining. Sulphide gas has a strong odor and may cause health effects.

• Particulate Matter: During processing, the material may generate particulate matter such as metal dust, swarf, etc. These particles may contain harmful metals and compounds that pose a risk to the respiratory system and the environment.

The treatment and treatment of exhaust gas in CNC workshops is crucial to ensure the health of the environment and the safety of employees. Taking appropriate waste gas treatment measures, such as local ventilation, central dust removal system, adsorption technology, wet scrubber, etc., can effectively reduce waste gas emissions, improve air quality, and reduce the risk of environmental pollution. At the same time, strengthening employee training and awareness raising, using equipment correctly and taking protective measures are also important steps to reduce the impact of CNC workshop exhaust gas on human health.

Wet scrubbers have attracted much attention due to their efficient exhaust gas purification effect and wide applicability. This article will take an in-depth look at the advantages of wet scrubbers in treating CNC workshop exhaust air.

Working Principle Of Wet Scrubber

The wet scrubber is a waste gas treatment equipment based on the principle of liquid phase absorption. It achieves the purification effect by contacting the exhaust gas with the liquid, so that the pollutants in the exhaust gas are dissolved or adsorbed into the liquid. When treating exhaust gas from CNC workshops, wet scrubbers usually use water as the absorbent, but other liquids can also be selected according to the composition of the exhaust gas.

The wet scrubber is mainly composed of a bottom liquid storage tank, a packing layer, a spray system and an air duct. The exhaust gas enters the tower body from the bottom, and contacts the sprayed liquid through the packing layer, and the pollutants in the exhaust gas are captured in the liquid. After multi-stage packing layers and spraying, the harmful components in the exhaust gas are gradually purified, and the exhaust gas finally discharged meets the environmental protection standard.

Advantages Of Wet Scrubber In Treating CNC Workshop Exhaust Gas

1. Efficient waste gas purification effect
Wet scrubbers can effectively capture particulate matter and gaseous pollutants in exhaust gases due to their working principle based on liquid-phase absorption. Especially for difficult-to-treat exhaust gases such as volatile organic compounds (VOCs) produced in CNC workshops, wet scrubbers can significantly improve the efficiency of exhaust gas purification and reduce harmful substances to acceptable levels.

2. Wide applicability
Wet scrubbers are suitable for treating various types of waste gas, including organic waste gas, acid waste gas, alkaline waste gas, etc. This makes the wet scrubber a universal exhaust gas treatment solution that can adapt to the exhaust gas characteristics of different CNC workshops.

3. Lower secondary pollution
Since the wet scrubber absorbs pollutants through liquid, no secondary pollution will occur. In contrast, some other exhaust gas treatment technologies may produce secondary pollutants during the treatment process, which increases the difficulty of subsequent treatment. Wet scrubbers can effectively avoid this problem and reduce environmental risks.

4. Strong temperature adaptability
The wet scrubber has a strong adaptability to the temperature change of the exhaust gas. In the CNC workshop, the temperature of the exhaust gas may fluctuate greatly, while the wet scrubber can adapt to the exhaust gas at different temperatures within a certain range and maintain a relatively stable purification effect.

5. Low energy consumption and operation and maintenance costs
Compared with some high-energy exhaust gas treatment technologies such as high-temperature oxidation, wet scrubbers have lower energy consumption. At the same time, the operation and maintenance cost of the wet scrubber is relatively low, the maintenance is relatively simple, and consumables do not need to be replaced frequently, which reduces the overall treatment cost.

Application Of Wet Scrubber In Practical Cases

Taking a CNC workshop as an example, the exhaust gas mainly includes VOCs produced by the volatilization of machine tool coolant and particulate matter produced during metal processing. The workshop uses a wet scrubber as the exhaust gas treatment equipment and has achieved remarkable results. The wet scrubber successfully purifies the harmful components in the exhaust gas through gradual packing and multiple sprays, so that the exhaust gas meets the national environmental protection standard.

Conclusion
Exhaust gas treatment in CNC workshop is an important task to ensure environmental health and safety. As an exhaust gas treatment technology with high efficiency, wide applicability, low secondary pollution, strong temperature adaptability, and low energy consumption, wet scrubber has obvious advantages in the treatment of exhaust gas in CNC workshops. When choosing an exhaust gas treatment solution, companies can fully consider wet scrubbers as a viable option to achieve environmental protection and sustainability.