Steam jet parameter design method of steam soot blowing device

Abstract

The invention relates to a steam jet parameter design method of a steam soot blowing device. The steam soot blowing device comprises a steam soot blower, a gun barrel and a nozzle assembly, the nozzle assembly comprises a first nozzle assembly and a second nozzle assembly, and the first nozzle assembly comprises a throttle pipe internally provided with a throttle shrinkage cavity. The second nozzle assembly comprises a venturi nozzle communicated with the gun barrel. The design method comprises the steps of marking the throttle pipe and the venturi nozzle, and designing various parameters of the throttle pipe or the venturi nozzle. According to the design method, the steam purging uniformity can be improved, the circumferential radians of a heating area and a purging area of the nozzle assembly of the soot blowing device are correspondingly increased along with increase of the radius of a rotor of an air preheater, and the circumferential angles corresponding to all sets of purging tracks are approximately equal; and the amount of heated and purged steam borne by heat exchange elements in unit areas of different radial areas of the rotor tends to be consistent, and the phenomena of underblowing of heat exchange elements at the outer side of the rotor of the air preheater and overblowing of heat exchange elements at the inner side of the rotor of the air preheater are avoided.

Description

technical field [0001] The invention relates to a steam soot blowing device, in particular to a steam jet parameter design method of the steam soot blowing device. Background technique [0002] Coal-fired power plant boilers are conventionally equipped with rotor rotary air preheaters, which are divided into flue gas sub-bins, secondary air sub-bins and primary air sub-bins in the circumferential direction. Through the flue gas sub-bin, the secondary air sub-bin, and the primary air sub-bin, the periodic heat storage and heat release process is carried out: in the flue gas sub-bin, high-temperature flue gas passes through the heat exchange element from top to bottom, and the flue gas releases heat When the temperature drops, the heat storage temperature of the heat exchange element rises; in the secondary air compartment and the primary air compartment, the cold secondary air and the cold primary air pass through the heat exchange element from bottom to top, and the heat abs...

AI Technical Summary

Problems solved by technology

[0008] In the above-mentioned air preheater steam soot blower technology, CN204881327 increases the residence time of the air preheater rotor heat exchange element on the circumference of the steam blowing section, but for the highly cohesive deposition ash containing ammonium bisulfate, conventional steam The effect of the soot blower is limited. The main reason is that when the jet steam reaches the surface of the heat exchange element, although the central jet velocity of 80-120m / s is still retained, the temperature of the purge steam is reduced to about 100m / s due to the surrounding low-temperature flue gas. ~150℃

In the face of highly viscous sedimentary ash containing ammonium bisulfate, even though the steam jet has a strong scouring shear effect, due to the low temperature of the jet steam, it is impossible to weaken the strength of the deposited ash by heating the ammonium bisulfate in the vaporized deposition ash. It also seriously reduces the blowing effect of the steam soot blower on the deposited ash containing ammonium bisulfate

Images