SU1285167A1 - Method of starting boiler-turbine power plant - Google Patents

Abstract

The invention relates to a power system and can be used in a power unit with a flow-through boiler equipped with an integrated separator and valve. The aim of the invention is to increase the efficiency of start-up. In the initial period of kindling, a change in the variable pressure in the boiler path occurs before the built-in valve (BZ), which is higher by a certain constant value of the end pressure at the maximum temperature in the steam generating path. Upon reaching the pressure level at least to: allowable under the CONDITIONS of the operation of the steam generating tract in the start-up load range with a two-phase medium, the pressure is set constant until the opening of the OT. The subsequent loading of the block after the opening of the OT leads, with sliding pressure, in the whole path of the boiler. (L

Description

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The period of pressure in the boiler path in front of the built-in gate valve (VZ) is maintained by variables: higher by a certain constant value of pressure is at a maximum temperature in the steam generating path. After the pressure reaches the EOI, as the temperature rises, the level of the minimum allowable for the final stage of work

Route at 130 kgf / cm until the opening of the OT. The opening is performed when the steam pressure in front of the turbine rises to 100-105 kgf / cm due to its loading up to 320 MW with three of the four turbine control valves fully open.

By applying the method, it is possible to reduce the costs of third-party start-up stages. In addition, the maximum demand for third-party steam at the start-up of the unit, which is exactly at the initial stage of start-up, is reduced, since at later stages the generation of steam for start-up needs is carried out by its own boiler.

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The invention relates to a power system and can be used in a power unit with a flow-through boiler equipped with a separator and a gate valve integrated into the boiler duct.

The purpose of the invention is to increase the profitability of the launch.

The method is implemented as follows.

When the boiler is fired up, at the initial stage of steam, the steam

coca in a period of 2 to 5 hours

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You have a two-phase boiler with a closed OT, it is set constant until the OZ is opened. This moment is determined by the condition of achieving an acceptable differential on the integrated gate valve with all the turbine control valves fully open (or part). During the start-up process, after powering on the unit, the unit is loaded at the indicated constant valve position until the nominal pressure is reached. At the same time, after opening the VZ, the pressure is established to slide over the entire path of the boiler.

So, for example, the kindling of the boiler of the TGMP 204 unit of 800 mW is carried out until the temperature rises in front of the built-in valve to Z29 s at variable pressure depending on the maximum temperature of the medium in the path before the built-in valve. When the specified temperature is reached, and, accordingly, the pressure in the path to VZ 130 kgf / cm (defined as the minimum allowable when the boiler operates with a two-phase medium in the steam generating path), the pressure is stabilized

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Claims (1)

Invention Formula The method of starting the boiler-turbine power unit by loading the turbine when the boiler is fired up with the internal valve closed, bypassing the medium from the boiler steam generating path through the integrated separator to the superheater channel with the turbine control valves fully open, then opening the integrated valve and then loading the turbine with sliding valve pressure in all paths of the boiler, characterized in that, in order to increase the efficiency of the start-up, the kindling of the boiler with a closed inlet valve produces variable Ed last pressure medium exceeding nasscheni pressure at a maximum temperature in the steam generating path, until the minimum pressure during operation of the boiler with a two-phase medium in the steam generating path, after which the pressure is set to a constant valve opening built.