SCR catalyst blockage removing device

Abstract

An SCR catalyst blockage removal device, which utilizes the shock wave principle of pulse injection to perform strong blockage removal on the SCR catalyst through "explosive" jet air flow, and is characterized in that: the compressed gas stored in the air cannon (1) instantaneously removes the blockage of the SCR catalyst. It is released to form an "explosive" high-pressure air mass, which is transported into the SCR reactor through the injection pipe (2) and the "duck-bill" nozzle (3), and the SCR catalyst and the protective layer (4) are deposited and blocked. Horizontal spray to clear blockage. According to the catalyst of different specifications, the blocking removal device can be evenly arranged around each layer of catalyst, and can be automatically opened and closed according to the resistance change of the catalyst layer to realize the blocking function, so as to ensure the performance of the catalyst, prolong the service life of the catalyst, and reduce the energy consumption of the equipment. The technical solution has significant advantages such as strong blocking ability, no damage to the catalyst, no influence on the normal operation and maintenance of the SCR, low cost, and convenient installation and maintenance.

Description

technical field [0001] The invention relates to a dust removal device of flue gas purification equipment, in particular to a catalyst blockage removal device for SCR. technical background [0002] With the promulgation and implementation of the newly revised "Emission Standard of Air Pollutants for Thermal Power Plants" (GB 13223-2011), more stringent requirements are put forward for the emission of nitrogen oxides from thermal power plants. Selective catalytic reduction (SCR) flue gas denitrification technology, because of its high denitrification rate (up to 90%) and mature technology, is the first choice for thermal power plants to further control NOx emissions after adopting low nitrogen combustion technology. As nitrogen oxides are listed as the binding assessment indicators for total air pollution control in the "Twelfth Five-Year Plan", SCR flue gas denitrification devices are being widely used in flue gas denitrification in my country's electric power, metallurgy, bu...

AI Technical Summary

Problems solved by technology

However, this method still has the following problems: the blowing pipe used for dust cleaning is placed inside the reactor, which relatively reduces the flow cross section of the SCR reactor, which leads to an increase in running resistance and affects the reaction effect; the high-concentration dust-laden airflow directly scours the blowing pipe and wear, the failure rate is high; the overhaul space of the catalyst is occupied, and maintenance and overhaul are difficult; in addition, the vertical injection of the pulse air flow on the catalyst layer will cause impact damage to the catalyst and easily cause dust to penetrate into the catalyst, which affects the SCR to a certain extent. Catalyst service life

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