An industrial waste gas treatment process

Abstract

The invention belongs to the technical field of industrial waste gas treatment, and specifically relates to an industrial waste gas treatment process. The SCR denitrification device used in the process includes a mixing chamber, a motor, a rotating tube, a spiral tube, and a connecting tube. The shaft end of the motor is The head is fixedly connected with one end of the rotating pipe; the cylindrical surface of the rotating pipe is provided with an air outlet; the cylindrical surface of one end of the rotating pipe is fixedly connected with one end of the connecting pipe; the other end of the connecting pipe is fixedly connected with one end of the spiral pipe; There is an air outlet on the spiral tube; the SCR denitrification device in the present invention realizes the uniform release of ammonia gas into the mixing chamber through the rotation of the spiral tube, and then realizes uniform mixing with the flue gas passing through the mixing chamber; through the driving gear Drive the driven gear to rotate, realize the higher the speed of the motor, the greater the concentration of ammonia gas in the mixing chamber, ensure that the concentration of flue gas entering the mixing chamber corresponds to the concentration of ammonia gas, and then ensure the concentration of flue gas and ammonia gas optimal mixing ratio.

Description

technical field [0001] The invention belongs to the technical field of industrial waste gas treatment, in particular to an industrial waste gas treatment process. Background technique [0002] Traditional denitrification mainly uses selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR). Among them, the widely used SCR technology is an effective method to control NOx emissions from the tail gas. The reducing agents include urea, ammonia water and pure ammonia. Usually, NH3 is used as the reducing agent to reduce NOx to harmless NOx under the action of the catalyst. N2, thereby removing NOx in the flue gas. Reasonable selection and use of catalyst is the core of SCR technology. The structure of the catalyst mainly has three types: honeycomb type, flat plate type and corrugated plate type. Among them, flat or corrugated plate catalysts have better anti-dust and clogging capabilities than honeycomb catalysts, but the gas-solid contact specific surfa...

AI Technical Summary

Problems solved by technology

Increasing the cross-sectional area of ​​the device not only causes the flow field in the tower to present a laminar flow state, reduces the turbulence of the mixer, and reduces the denitrification efficiency, but also increases the deposition of particulate matter in the flue gas, causing a large amount of dust to accumulate on the surface of the catalyst. It affects the activity of the catalyst and increases the escape of ammonia; increasing the height or length of the tower body greatly increases the amount of catalyst used, increasing construction and operating costs

[0004] There are also some technical solutions for SCR denitrification in the prior art. For example, a Chinese patent with application number 201510768338.6 discloses a double-spin SCR denitrification method and its device, including the denitrification tower body and the inner wall along the denitrification tower body. The first plate-type catalyst layer arranged on the circumferential surface is provided with a second plate-type catalyst layer in the first plate-type catalyst layer; the cavity between the first plate-type catalyst layer and the second plate-type catalyst layer is the first swirl catalytic reaction chamber, The cavity in the second plate catalyst layer is the second swirl catalytic reaction chamber; the bottom end of the second swirl catalytic reaction chamber is provided with a cyclone; the top of the first swirl catalytic reaction chamber is sealed, and The upper side wall of the body is provided with a flue gas inlet pipe along the tangential direction of the inner circumference of the denitrification tower body; a plurality of swirl pipes are respectively arranged along the inner peripheral surface of the flue gas inlet pipe and the inner peripheral surface of the top of the first swirl catalytic reaction chamber. Flow atomization nozzle; the SCR denitrification method in this technical solution can achieve high-efficiency denitrification, and the technical means are simple and easy to implement. Compared with the existing technology, the structure of the denitrification tower is simple and the cost is low, which greatly reduces the cost of denitrification and significantly improves economic benefits. However, the spiral airflow generated by the swirl atomizing nozzle and the swirler in this scheme will gradually weaken, and the mixing degree of the ammonia gas and the flue gas will also gradually weaken accordingly, so the mixing ratio of the ammonia gas and the flue gas will be inconsistent. Ultimately affect the effect of denitrification reaction

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