After several years of "blue sky defense war" and "ozone battle", China's VOCs Pollution Control has changed from scratch to excellent. While the emission standards of various places and industries are gradually improving, the manufacturing level and performance level of various processes and equipment are also steadily improving.
As an expert in environmental protection materials, he has been committed to improving the level of catalytic and adsorption materials in the field of VOCs treatment and providing more valuable solutions for the market and customers. In daily work, engineers of Feiteng technology will face a lot of technical consultation. Some problems are relatively elementary but very common, and some problems are novel and difficult. In order to better help you understand the catalytic combustion process, we will share some valuable information in the form of Q & A this time, hoping to help more employees.
1. Q: does the catalyst have a strong ability to treat waste gas, and the catalytic combustion equipment with tens of thousands of air volume only needs a few tenths of cubic meters of catalyst?
A: the understanding is not quite correct. The space velocity of conventional catalyst is 10000 / h to 20000 / h. based on the catalytic combustion equipment with 3000nm3 / h air volume, the amount of catalyst is about 0.2m3. If it is said that the equipment with tens of thousands of air volume only uses a few tenths of cubic meters of catalyst, it means that the equipment should be an adsorption concentration + catalytic combustion equipment. The tens of thousands of air volume here is adsorption air volume, not desorption or catalytic air volume. The equipment name is not standardized, which misleads everyone.
2. Q: can the content of precious metals in the catalyst determine the quality of the catalyst? The higher the better?
Precious metals cannot be defined as good or bad. A good catalyst should be a product that meets the technical needs of the project, such as catalytic efficiency, working temperature, service life and temperature resistance grade. The preparation of catalysts involves different formulations and processes, and the content of precious metals is only one factor. On the premise of correct formulation selection, the more precious metals, the longer the service life of catalysts and more stable performance, but the price will also increase. Therefore, we do not recommend to define the quality of the catalyst by the content of precious metals.
3. Q: can the catalyst used in activated carbon adsorption and desorption be used in the runner adsorption and desorption device?
A: This is not recommended. The working temperature of catalytic combustion in conventional activated carbon adsorption and desorption equipment is really between 300-450 degrees, while the working temperature of catalytic combustion in runner adsorption and desorption equipment is between 300-600 degrees. The difference between the two working temperatures depends on the concentration after desorption. The concentration of waste gas desorbed by runner is generally thousands of mg / m3, which is higher than that of activated carbon desorption. Therefore, the temperature resistance grade design of the two catalysts is different. The temperature resistance of the catalyst behind the runner configured by Feiteng should generally reach 700-800 degrees to avoid overtemperature failure, which is difficult for the catalyst after activated carbon.
4. Q: will precious metal catalysts be poisoned by sulfur-containing and chlorine containing waste gas and cannot be used?
A: sulfur containing and chlorine containing waste gas will indeed poison precious metals, but it is not completely unusable. Feiteng has developed a catalyst that can resist poisoning and can be used when the toxic substance has a certain concentration. For specific conditions, please consult the engineers of Feiteng technology. Conventional catalysts are indeed easily poisoned by sulfur or chlorine pollution and are more or less irreversible.
5. Q: can precious metal catalysts treat dioxins?
6. Q: Why are precious metal catalysts so expensive? Is there room for price reduction
A: the main reason is that the market price of precious metals, the main raw material used in the catalyst, is relatively high, and there is no room for reduction due to the shortage of precious metal resources in the long run. Therefore, the cost of catalysts with the same precious metal content will not change much.
7. Q: how to judge whether the service life of the catalyst is approaching?
A: the most direct way is to take samples from the equipment and send them to the laboratory of Feiteng technology. We can judge the comparison between the catalytic performance of the product and the new product through the catalytic curve obtained from the bench test. If the temperature of the curve moving on the temperature axis is too large, we can judge that the catalyst has failed.
8. Q: what is the conventional size of the catalyst? Can you customize it?
A: the general size is 100 * 100 * 50mm or 150 * 150 * 50mm. This size has low production cost and good economy. If the customer has special requirements for size and can bear the cost of mold opening and trial production, it can be customized.
9. Q: the heating power of catalytic combustion is not enough. Can the catalyst react normally?
A: in this case, if the ignition temperature required by the catalyst cannot be reached, the catalyst may have low reaction efficiency. If the heating power cannot be improved, it is recommended to use Feiteng technology's low-temperature catalyst hc5641, which is 50 ° C-80 ° C lower than the reaction temperature of conventional catalyst.
10. Q: can the catalyst be returned to the manufacturer for recycling after use?
A: the catalyst after use belongs to hazardous solid waste. It is recommended to find a qualified third party to deal with it according to the requirements of the environmental impact assessment and the local environmental protection bureau. It cannot be sent to other manufacturers for treatment without permission.