A Design Method of Steam Jet Flow Parameters for Steam Soot Blowing Device

Abstract

The invention relates to a steam jet parameter design method of a steam sootblower. The steam sootblower includes a steam sootblower, a gun barrel and a nozzle assembly. The nozzle assembly includes first and second nozzle assemblies, and the first nozzle assembly includes an internal arrangement A throttling tube with a throttling shrinkage hole, a throttling tube; the second nozzle assembly includes a venturi nozzle communicated with the barrel, the design method includes marking the throttling tube and the venturi nozzle, and designing the throttling tube or the venturi parameters of the nozzle. The design method of the present invention can improve the uniformity of steam purging. With the increase of the rotor radius of the air preheater, the circumferential arc of the heating area and the purging area of ​​the nozzle assembly of the soot blower increases correspondingly, and the circumferential angles corresponding to each group of purging tracks are close to The amount of heating and purging steam per unit area of ​​the heat exchange elements in different regions of the rotor radial direction tends to be the same, avoiding the phenomenon of under-blowing of the outer heat exchange elements of the air preheater rotor and over-blowing of the inner heat exchange elements.

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...

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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

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