Soot blower steam source device utilizing low-temperature reheater access port steam

Abstract

The invention provides a soot blower steam source device utilizing low-temperature reheater access port steam. The device comprises low-temperature reheater inlet steam, low-temperature reheater outlet steam, an ejector and a steam soot blower air source, wherein the ejector is composed of a high-pressure nozzle, a low-pressure nozzle, a mixing chamber, a mixing chamber throat portion and a diffusion section, the low-temperature reheater inlet steam flows in from the high-pressure nozzle as working fluid, the low-temperature reheater outlet steam is introduced into the mixing chamber from the low-pressure nozzle as driving fluid, and after mixing and pressurization of the ejector, mixed steam sprayed out of a diffusion pipe finally serves as the steam soot blower air source. The structural dimension of the ejector can be optimized through parameter design of the low-temperature reheater inlet steam and the low-temperature reheater outlet steam, so that parameters of mixed steam meet the parameter requirement of the soot blower air source under various load conditions, the problem that high-quality steam is wasted when final-stage superheated steam serves as the soot blower air source is solved, and the economical efficiency of a unit is improved.

Description

technical field [0001] The invention relates to the technical field of boiler steam sootblowing in a power station, in particular to a sootblower steam source device utilizing steam from the inlet and outlet of a low-temperature reheater. Background technique [0002] During the operation of power plant boilers, in order to effectively remove the ash accumulation on the heating surface of the boiler, ensure that the heating surface is clean, and make the heat transfer effect of the heating surface good, it is necessary to arrange different types and types of soot blowers on the heating surface of the boiler. Among them, the steam soot blower is a kind of boiler soot blower, and it is also the most widely used type of soot blower. At present, the choice of steam source for the steam soot blower of the power plant boiler mostly adopts the inlet steam of the final superheater, and also uses the inlet steam of the reheater and the outlet steam of the reheater. However, the stea...

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Problems solved by technology

However, the steam at the outlet of the final superheater is high-temperature and high-pressure steam, and the steam source parameters are relatively high. It needs to pass through the temperature and pressure reduction station to be used by the steam sootblower, and the temperature and pressure reduction station will cause irreversible throttling loss to the steam. This means that high-quality steam is wasted, resulting in economic losses for the power plant. At the same time, this system also has problems such as large pressure difference before and after the regulating valve and easy damage to the valve.

If the reheat steam is selected as the steam source of the steam soot blower, the economical efficiency of the unit can be significantly improved, but since the inlet of the reheater is steam with high-pressure and low-temperature parameters, and the outlet steam is steam with high-temperature and low-pressure parameters, it is not recommended to use this steam alone. It is difficult for the two streams of steam to directly meet the parameter requirements of the steam source of the steam soot blower, especially at low load, the parameters of the reheat steam are lower, which cannot meet the steam source requirements of the soot blower. Secondly, at high load, the reheat steam It is necessary to reduce the temperature and pressure to be used as the steam source of the soot blower, and there is still throttling loss

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