How to determine the quality of activated carbon in the filter element
Published by Publisher: Baichuan Hengye FilterDate: 9/24/2012 10:57:56 AM Read: How to determine the quality of activated carbon in the filter element
1. Judging by composition: It is better to use granular coconut shell activated carbon with a size of 0.42~0.85mm, because the two national standards for indoor air quality GB50325 and GB/T18883 have clearly stipulated that, for example, Appendix B3.1 of the Air Quality Standard GB/T 18883-2002 of the People's Republic of China stipulates that the test method for benzene in indoor air is to use a test tube sampling method, which means that benzene in indoor air is sampled and then taken back to the laboratory for analysis. The specification standard for benzene sampling tubes specifies that it should be consumed: "Coconut shell activated carbon: 20-40 mesh (0.42mm~0.85mm size) Used for installing activated carbon sampling tubes, Then take it back to the laboratory and use carbon disulfide to analyze the benzene adsorbed in the coconut shell activated carbon. Please note that the standard specifies that it is coconut shell activated carbon, and it is 20-40 mesh, which is equivalent to a particle size of 0.42-0.85mm. Fake and inferior products: The first type is cylindrical coal based activated carbon; The second type: powdered coal based activated carbon; The third type: granular bamboo charcoal; The fourth type is granular fruit shell charcoal, which is usually very large in size. Many of them are not coconut shell charcoal, but other types of fruit shell charcoal. Generally, manufacturers of coconut shell activated charcoal are located in the south, and coconuts do not grow in the north. These types of products are general activated carbon used for industrial consumption, which is used to adsorb indoor decoration pollution and has poor effectiveness.
2. Secondly, look at the pore size and composition: As we all know, activated carbon adsorbs harmful gases based on its pore size. It is obvious that different harmful substances have different molecular weights and particle sizes, so the pore size of activated carbon that adsorbs different harmful gases will not be the same. Generally speaking, activated carbon that adsorbs different gases is also different in appearance. Currently, indoor pollution mainly includes formaldehyde, benzene, TVOC, etc., so professional activated carbon manufacturers will use a mixture of two or more different types of activated carbon to produce better results.
3. Three factors to consider: particle size should not exceed 1.5mm. According to national standards, the particle size of activated carbon should be between 20-40 mesh, which translates to a particle size of around 0.42-0.85mm. Activated carbon with particles larger than 1.5mm is not as effective as activated carbon with smaller particles. Generally speaking, the smaller the particle size of activated carbon, the larger the specific surface area, which means the better the adsorption effect. However, the smaller the particle size, the greater the loss and the larger the dust. Therefore, many manufacturers use activated carbon with larger particles to reduce costs, but the effect is not good. Even with such large particle activated carbon, there are still a lot of dust, and the quality can be seen at a glance.
4. Four factors to consider, namely the post-treatment of activated carbon: The primary principle of using activated carbon is not to dirty objects or cause harm to the human body. Therefore, in the production of activated carbon, post-treatment is necessary, which involves removing dust from crushed coconut shells and other materials. Otherwise, if there is too much dust, the cleanliness will be very poor, and the activated carbon pocket will be very dirty when held in hand. This result is that if inhaled, the activated carbon will become dirty,
