Method for adsorbing nitrogen oxides by use of mordenite

A technology of mordenite and nitrogen oxides, which is applied in the field of nitrogen oxides treatment, can solve the problems of secondary pollution, small adsorption capacity of adsorbents, unfavorable enterprise development, etc., and achieve small usage, high adsorption efficiency, and good recycling benefits Effect

Inactive Publication Date: 2014-07-23
SICHUAN STONG EURO & AMERICA ENVIRONMENT ENG
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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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  • Method for adsorbing nitrogen oxides by use of mordenite

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Effect test

Embodiment 1

[0036] Such as figure 1 As shown, the system using mordenite to adsorb nitrogen oxides includes a pretreatment system, an adsorption-desorption system, and a cooling collection system connected in sequence.

[0037] The pretreatment system includes a fan 1, an acid pump 2, a cooling tower 3 and a wire mesh filter 4; wherein the fan 1, the cooling tower 3 and the wire mesh filter 4 are connected in sequence, and the acid pump 2 is connected to the bottom of the cooling tower 3 , and connect the fan 1 to the pipe net leading to the cooling tower 3 at the same time, and the wire mesh filter 4 communicates with the adsorption and desorption system. The acid pump 2 extracts the acid generated inside the cooling tower 3, cleans the waste gas conveyed by the fan 1, and removes impurities such as dust in the waste gas. The acid in the cooling tower 3 is formed by dissolving part of the waste gas in water, and collects at the bottom of the cooling tower 3 , the acid pump 2 is used to ...

Embodiment 2

[0055] The catalytic reduction method is now used in the market to treat nitric acid tail gas more thoroughly, but it consumes expensive metal platinum and produces a lot of ammonia, and the nitrogen oxides in the tail gas have not been recycled. The price of metal platinum is more than 550 / yuan per gram, Platinum metal is used as a catalyst to treat nitric acid tail gas. Due to the large amount of tail gas and the long-term process, the use of platinum metal is large, the cost of treatment is high, and it is easy to cause water pollution. The ammonia produced is dissolved in water to obtain ammonia water. Its volatility, the risk of explosion, can not be effectively treated, prone to air pollution, nitrogen oxides are not recovered, always exist in the tail gas, did not achieve the fundamental purpose of treatment, is not conducive to the development of enterprises, and the use of the present invention , can absorb the nitrogen oxides in the tail gas, and finally convert it in...

Embodiment 3

[0057] The liquid absorption method is relatively simple, but the absorption efficiency is only 60-70%. Most nitrogen oxides are insoluble in water or other liquids, so there is no way to absorb them. However, the absorption efficiency is 98% when using mordenite. The content of nitrogen oxides in the exhaust gas meets the national air emission standards.

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/02
Inventor 李华胡登燕郑传勇黄银忠
Owner SICHUAN STONG EURO & AMERICA ENVIRONMENT ENG
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