Method and device for processing explosion exhaust air

Abstract

The invention provides a disposal method and a device used for disposing explosion waste gas, consisting of a separator, a high-efficiency filter, a molecular sieve drier, a NOx adsorbing device, a NOx reducer, a burner, a deodorizer, a circulation fan, an electric heater, etc. The disposal method of the invention comprises the steps as follows: a: waste gas disposal process: the explosion waste gas is disposed by a cyclone filter, the high-efficiency filter, a molecular sieve dehydrator, the NOx adsorbing device and the deodorizer, burned by entering the burner and is exhausted; b: system inerting process: the air feeding of the waste gas disposal device is cut off, nitrogen is filled into the system so as to lead the oxygen content to be less than 2%; c: desorption and reducing process:the circulation fan is started; gas circulation between the circulation fan, the gas electric heater, the NOx reducer and the NOx adsorbing device is established, the reducing gas is filled into the system, the gas electric heater is started, the temperature of the circulation gas is gradually increased, the NOx is de-adsorbed and reduced as N2. After continuous running, the content of the NOx achieves the exhaust standard requirement.

Description

technical field [0001] The invention relates to a treatment method and device for explosion waste gas, in particular to a treatment method and device for waste gas generated in an explosion experiment. Background technique [0002] Based on the purpose of civil and military industries, explosion experiments are often required. After the explosion experiments, a lot of exhaust gas is produced, which contains various substances that are harmful to the environment and ecology or fire hazards, such as: heavy metal aerosols, NOx, CO, H 2 , CO 2 、CH 4 In the past, these explosive products were directly discharged into the atmosphere, causing harm to the environment. For example, heavy metals in heavy metal aerosols may be absorbed by plants and enter the human food cycle and accumulate, thereby causing damage to the surrounding human body. Health damage, NOx accumulation in the atmosphere produces acid rain (fog), etc. In addition, the explosion products have peculiar smell, the...

AI Technical Summary

Problems solved by technology

However, explosion exhaust gas has very different characteristics from other NOx exhaust gases. Existing mature methods for treating NOx exhaust gas, such as lye absorption, catalytic reduction, and plasma technology, cannot be directly used for the treatment of explosive products, such as lye absorption. A large amount of spent alkali (salt) solution is produced, and the salt product may be unstable, which is easy to cause secondary pollution or pollutant transfer, and the lye absorption method cannot remove the H in the explosion product. 2 , CO, CH 4 and other combustibles, especially a large amount of waste alkali (salt) liquid produced by alkali absorption is a great burden for the institutions conducting explosion experiment research and cannot be accepted by them; the mature catalytic reduction method is to add reducing gases such as NH to the waste gas 3 , urea and other components, under the action of the catalyst, NOx is reduced to N 2 , but the existing catalytic reduction method cannot be directly applied to the treatment of explosion exhaust gas, because the explosion experiment adopts intermittent operation, and the composition of each explosion exhaust gas is also very different. The more unfavorable factor is that the content of harmful substances varies with The time varies greatly, and the explosion experiment research institutions also have strict requirements on the exhaust gas treatment time, so the design of catalytic reduction according to the initial concentration will lead to huge equipment, high requirements on related reducing gas facilities and power load, and the explosion products contain relatively high High-concentration oxygen, if the ratio is improper, the catalytic reduction process has the risk of explosion, and the final NH 3 Similar reducing agents have a strong pungent smell and cannot be accepted by the construction party, so simply imitating the existing catalytic reduction technology is not suitable for the treatment of explosion exhaust gas

Other methods, such as plasma technology, consume more energy and are still in the research stage, and have not yet met the practical requirements for the treatment of explosion exhaust gas.

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