Control method for steam temperature of meager coal boiler of 1045MW ultra supercritical unit

Abstract

The embodiment of the invention discloses a control method for the steam temperature of a meager coal boiler of a 1045MW ultra supercritical unit. The control method is used for solving the technical problems that because mature ultra supercritical steam temperature control technologies capable of being applied to actual production fields lack currently, heating surface over-temperature pipe explosion is frequently caused by unreasonable steam temperature control of a field ultra supercritical boiler, large potential safety hazards are caused to safe and stable operation of a power plant, and severe economic loss of a large thermal power plant is caused. The control method includes the steps that in the boiler unit starting process, design performance data of the unit are compared, and overall regulation and control are conducted according to the corresponding relation curve of water supply quantity, coal supply quantity and air volume under different loads; when the load of the boiler unit is increased or decreased, the air volume, coal supply quantity and water supply quantity are increased or decreased with the same ratio; when the boiler unit normally operates, the superheat degree of the intermediate point is controlled to regulate the water-fuel ratio to be proper; and water spraying adjustment is carried out, so that deviation in regulation of the water-fuel ratio is eliminated.

Description

technical field [0001] The invention relates to the field of boiler steam temperature control, in particular to a method for controlling the steam temperature of a lean-coal boiler of a 1045MW ultra-supercritical unit. Background technique [0002] Compared with supercritical and subcritical boilers, the steam temperature change characteristics of ultra-supercritical boilers are more complicated to control. At present, relevant technical researchers have carried out theoretical research on the steam temperature characteristics of supercritical boilers, and combined with the data of on-site boiler operation, a method of steam temperature control for supercritical boilers has been proposed. [0003] But so far, there is no mature ultra-supercritical steam temperature control technology that can be applied to the actual production site, so it brings great difficulties to the regulation and control of the ultra-supercritical boiler steam temperature on site. On-site ultra-super...

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Problems solved by technology

[0004] The embodiment of the present invention provides a method for controlling the steam temperature of a 1045MW ultra-supercritical unit lean-coal boiler, which solves the problem of on-site ultra-supercritical steam temperature control due to the lack of mature ultra-supercritical steam temperature control technology that can be applied to actual production sites. Due to the unreasonable control of the steam temperature, the boiler often causes the heating surface to overheat and burst the tube, causing great safety hazards to the safe and stable operation of the power plant, and causing serious economic losses to large-scale thermal power plants.

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