Exhaust gas pretreatment can extend catalyst life

2021-11-10   Pageview:61

The exhaust gas may contain some harmful components to the catalyst, and if such chemicals are known to be present, the exhaust gas should be pretreated, otherwise these harmful components will have a significant impact on the catalyst life.

The exhaust gas should be pretreated (dust and oil removal and dehumidification) before passing into the catalytic bin. The introduction of dust, carbon and high boiling viscous materials adhering to the catalyst surface and covering the catalyst active sites can lead to catalytic action, therefore, the introduction of dust and high boiling viscous materials should be avoided as much as possible.

In higher humidity environment, water vapor and oil mist paint mist will easily interact with catalyst at high temperature and cause catalyst sintering and deactivation, so water vapor and oil mist paint mist should be minimized to enter the catalyst bed.

 

 

 

 

 

 

 

 

 

 

 

The friction coefficient of the surface of the coating film when it is wet is in parentheses.
Taber wear index (mass loss method, wear wheel CS17, load 1kg), the larger the value, the worse the wear resistance.
Comparative sample 1 is scattered with polyurethane fragments

It is an anti-slip agent with poor abrasion resistance. The anti-slip agent is easy to fall off during use and has a poor appearance. Comparative sample 2 uses silica sand as the anti-skid agent. Although the anti-skid and abrasion resistance are good, the distribution of silica sand is uneven (can be known from the gloss data) and the surface appearance is poor. Contrast 3, which does not use anti-slip agent, has poor anti-slip performance, especially when the surface of the coating film is wet, the friction coefficient is very low. Examples sasol container wax 1 to 4 using polyurethane particles as anti-slip agents have excellent skid resistance, a uniform matte surface, a uniform appearance, and good abrasion resistance.

Water-based non-slip floor coatings The water-based non-slip floor coatings introduced here are based on water
A water-based acrylic non-slip floor coating composed of non-slip acrylic resin and urea-formaldehyde polymer as non-slip particles. It is applied to the floor surface to improve the non-slip property.

Technical requirements for urea-formaldehyde resin particles: Barcol hardness to
Less than 10; the compressive strength is greater than 75.84MPa (1100Olbf/ in ), and the relative density is 1.1 to 1.6. Table 13-9 shows the composition of water-based acrylic non-slip floor coatings.

Composition of water-based acrylic non-slip floor coating
After the above composition is uniformly mixed, it is coated on the floor surface by a coater, and particles with a particle size of 40/6O mesh should be selected. The anti-slip agent particles are required to be covered by the coating film and anchored throughout the coating film. The average ratio of the thickness of the coating film to the particle size is (1:5)~(4:5). This is enough to ensure that each anti-skid agent particle covered by the coating base material protrudes a sufficient height on the surface of the coating film, forming numerous tiny bumps and convexities, and also extends part of the floor coating composition to the dry coating film. Each particle is anchored in the coating film because of enough part of the coating film, so high stability and durability are obtained.

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