Wet flue gas desulfurization and denitrification catalyst activity maintenance device and its implementation method

Abstract

The invention discloses a catalyst activity maintaining device for wet flue gas desulfurization and denitrification and an implementation method thereof, belonging to the field of desulfurization and denitrification, comprising an absorption tower, a drainage fan and a support frame, the support frame is installed at the bottom of the absorption tower for support, and one side of the absorption tower The upper and lower ends of the upper and lower ends of the absorption tower are respectively connected to the flue gas inlet pipe and the spray pipe, and the upper and lower ends of the other side of the absorption tower are connected to the circulation pipe. The drainage fan is installed on the circulation pipe to extract the gas from the top of the absorption tower and transport it to the bottom of the absorption tower; The dust in the dust removal area falls back to the catalyst body during the accumulation process, and the outside of the catalyst sleeve protects the catalyst body. The dust liquid mixed with water will fall on the catalyst sleeve during the falling process, and the catalyst sleeve is continuously driven by the motor. During the rotation, the dust on the catalyst sleeve and the catalyst body is thrown out by centrifugal force to keep the activity of the catalyst body.

Description

technical field [0001] The invention relates to the technical field of desulfurization and denitrification, in particular to a catalyst activity maintaining device for wet flue gas desulfurization and denitrification and an implementation method thereof. Background technique [0002] In the face of recent global climate anomalies, environmental issues have become the focus again. Sulfur dioxide, nitrogen oxides, and smoke are the main components of air pollutants in my country. A series of environmental problems caused by them cannot be ignored. The country has gradually strengthened the emission of air pollution in various industries. Supervision and governance of property, especially for industries such as thermal power, iron and steel, and metallurgy. [0003] At present, mature flue gas desulfurization and denitrification technologies include limestone gypsum wet desulfurization and SCR denitrification technology. Each processing link is carried out independently, result...

AI Technical Summary

Problems solved by technology

Among them, the construction investment cost is seriously affected by market economic factors such as steel prices in the market. At present, steel prices remain high, and the cost of the SCR system has been greatly increased; catalyst activity is difficult to maintain, daily cleaning is required, and the service life of the catalyst is short. When the denitrification rate is 80%~90%, the guaranteed life of the production plant is generally 16000~24000h; at present, there are many problems with the SCR denitrification device at home and abroad. After the boiler is installed with the SCR denitrification device, the length of the flue is increased and the heat dissipation surface area is increased. , increasing heat loss, after the flue gas passes through the SCR denitrification device, the temperature will drop by 5-8°C

At the same time, in order to fully carry out the reduction reaction, SCR denitrification devices are generally arranged in the high-dust flue gas section between the boiler economizer outlet and the air preheater inlet. In the harsh environment of dust, after a period of use, the internal channel of the denitrification catalyst will be blocked, which will increase the pressure difference of the denitrification catalyst and aggravate the wear of the denitrification catalyst. 3 Reaching the active surface of the denitrification catalyst, the phenomenon of ammonia escape is aggravated, the denitrification catalyst is deactivated, and even the denitrification catalyst is poisoned, so it has to be shut down unplanned for replacement of the denitrification catalyst

[0004] In the process of solving the above problems, a lot of new technology applications have been produced, such as authorized public numbers CN205586825U, CN20777940U, CN205832971U and other disclosed technologies that provide steam soot blowing, steam and sound wave soot blowing mixed use, bombardment sound wave The combination of soot blowing, steam soot blowing and sonic soot blower, low-power sonic soot blower and other methods are used to remove the dust on the surface of the denitration catalyst online, but all have different defects, and the actual effect is not ideal; the main reasons are: 1. The cleaning area of ​​the steam soot blower is small, which will cause a large area of ​​dust to accumulate in the area that cannot be cleaned, and the flow area is small, resulting in increased local resistance and partial collapse of the denitrification catalyst; The soot wave frequency of the soot blower is single, and it cannot be adjusted in time according to the situation of dust; 3. Due to the small sound power and short action distance of the low-power sonic soot blower, it cannot achieve effective full cleaning

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