Method for adsorbing nitrogen oxides by use of mordenite

Abstract

The invention discloses a method for adsorbing nitrogen oxides by use of mordenite. The method comprises the steps of using a blower to convey waste gas to a cooling tower, and cooling to (-5) to 5 DEG C; uniformly distributing gas and intercepting particulates through a screen filter; introducing into a first, a second, a third and a fourth absorber, all of which are filled with mordenite, wherein at this moment, a valve between the first absorber and a heater is in closed state; introducing the liquid after adsorption by the first absorber into a cooler, and cooling to 15-25 DEG C; counting acid generation amount through an acid metering tank and regulating flow through a rotor flow meter; and finally collecting. When the valve between the first absorber and the heater is in the closed state, the valve between the second absorber and the heater opens, and the second absorber is in the desorption state. The system has the advantages of continuous operation, repeated regeneration and utilization of adsorbent, little adsorbent consumption, high adsorption efficiency, and high recycled utilization benefits.

Description

technical field [0001] The invention relates to the field of nitrogen oxide treatment, in particular to a method for using mordenite to adsorb nitrogen oxides. Background technique [0002] Nitrogen oxides include a variety of compounds such as nitrous oxide, nitrogen monoxide, nitrogen dioxide, nitrogen trioxide, nitrogen tetroxide, and nitrogen pentoxide, among others. Except for nitrogen dioxide, other nitrogen oxides are extremely unstable, and turn into nitrogen dioxide and nitric oxide when exposed to light, humidity or heat, and nitrogen monoxide turns into nitrogen dioxide. Therefore, the occupational environment is exposed to several gas mixtures commonly known as gunpowder (gas), mainly nitric oxide and nitrogen dioxide, and nitrogen dioxide as the main. Nitrogen oxides have varying degrees of toxicity. Under high-temperature combustion conditions, NO X Mainly exists in the form of NO, the initial NO emitted X NO accounts for about 95% of the total. However, NO...

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Problems solved by technology

especially when NO 2 with SO 2 When they exist at the same time, they can catalyze each other and form nitric acid faster. In industry, it is mainly used to neutralize nitrogen oxides by chemical reaction between ammonia gas and nitrogen oxides. After ammonia gas and nitrogen oxides decompose and react, nitrogen and water are produced, but Ammonia water is easy to volatilize and cause secondary pollution. At present, the commonly used adsorbents for purification of nitrogen oxides by adsorption method include molecular sieve, activated carbon, silica gel, peat, etc. Due to the small adsorption capacity of the adsorbent, the amount of adsorbent used is large and the equipment is huge. Technical defects such as long regeneration cycle and intermittent operation have not been used on a large scale, and the adsorption effect on nitrogen oxides is poor, which is not conducive to the development of enterprises

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