It has been determined that the controlling mechanism of NOx absorption is different according to the relative concentration of NO and NO2. However, given the somewhat unusual design factors involved relative to more straight forward absorptive mass transfer chemical systems specific knowledge of the principles involved along with availability of empirical data is critical to determining an effective design. For all practical purposes it is impossible to remove NO gas by wet scrubbing in the situation in which the gas does not contain NO2. However, catalysts are affected by dust and most are poisoned by sulfur and chlorine compounds. Nevertheless, from an equilibrium standpoint, the absolute concentration of NO2 increases with temperature while the ratio of its concentration to that of NO decreases with increasing temperature. Another popular type of wet scrubber is the Venturi scrubber. We consider the following details as we outline your specialized scrubber: NOx scrubbers from MACH Engineering are built with polypropylene, PVC, CPVC, stainless steel and fiber-reinforced plastics (FRPs) tower packing, internals, and construction materials based on your application. Effectively treats NOx in concentrations from 10 ppm to 60,000 ppm. Formation of ozone: NOx is produced in a variety of different processes, including combustion equipment, gas turbines, incinerators, kilns and power plants. The fact is that a single stage of wet scrubbing cannot provide highly efficient NOx removal generally and especially for NO. If the ratio by volume of NO to NO2 is greater than 1 the NO equal in volume to NO2 will react to the nitrite, but the excess NO will essentially remain unchanged. Our engineers can also provide recommendations regarding the installation of your scrubber. The synergy between Damen Green Solutions and DSC provides owners and operators the very realistic benefits of proven project management skills, reduced downtime and informed product selection in relation to ballast water management systems, Exhaust Gas Cleaning systems, exhaust after-treatment, NOx reducer systems, LNG conversions and other, more traditional, methods of cleaner shipping. This fluctuating ratio, and the fact that these compounds exhibit quite different properties when contacted with water (as would occur in a wet scrubber) complicate the treatment of NOx. Scrubbers are devices that use a liquid (often water) to capture and remove pollutants. Venturi Scrubber from Perry, CEHB, VII check this web site for costs of scrubbers widely used types of particulate scrubbers. Therefore, the reaction between an alkaline solution and NO/NO2 is optimal at a 1:1 molal ratio of the oxides. The photo below depicts a NOx scrubber in which the waste gas flows through the scrubber in four stages (twice concurrently and twice countercurrently to the scrubbing agent). TECHNOLOGY Cross Flow Scrubber Design. The overall NO reaction, where the intermediate compounds are ammonium sulfite and bisulfate, may be expressed as: It was found that for recovery of 80% of 200ppm NOx the gaseous concentration of SO2 must be more than 1200 ppm [3]. The optimum pH of that scrubbing solution is about 9, where the oxidizing properties of NaOCl are the best. B: NOx(NO/NO 2) 2nd stage Know-NOx mist reaction using NaOH and a proprietary oxidizer. Although the reaction mechanisms are not clear, the main reaction that likely occurs when a large excess of sulfite ion is present may be described simply as follows: NO, however reacts very poorly even with sulfite solutions. Through a nozzle or orifice a scrubbing liquid is atomized and dispersed into the gas stream. ready for re-circulation in the chemical scrubber. NOx also is emitted as by product from many metal treatment processes where nitric acid is used as an oxidant. Better results are obtained for the absorption of SO2 and NOx by ammonia solutions containing a soluble catalyst in comparison with aqueous NaOH solution. Accordingly, a large mass-transfer surface is usually required.