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Method for improving main steam temperature of super-critical once-through boiler

A main steam temperature, once-through boiler technology, used in steam generation, lighting and heating equipment, control systems, etc., can solve the problems of affecting blade life, limited role in adjusting main steam temperature, low main steam temperature, etc. Service life, reduction of cavitation hazard, effect of increasing main steam temperature

Active Publication Date: 2015-07-01
ELECTRIC POWER SCI RES INST OF GUIZHOU POWER GRID CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for increasing the main steam temperature of a supercritical once-through boiler, so as to solve the problem that the main steam temperature of the supercritical once-through boiler is low, which affects the life of the blades and threatens the operation safety of the steam turbine, and the existing technology adjusts the main steam temperature. The role is limited and cannot meet the actual production needs

Method used

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  • Method for improving main steam temperature of super-critical once-through boiler
  • Method for improving main steam temperature of super-critical once-through boiler
  • Method for improving main steam temperature of super-critical once-through boiler

Examples

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Effect test

Embodiment 1

[0022] For the supercritical once-through boiler, the current main steam pressure is 25MPa, the main steam temperature is 540℃, and the superheat degree is 20℃. The pressure rate is 0.2~0.5MPa / min, and the system will synchronously control the feedwater pump 1 and coal mill 3 by judging the depressurization rate to reduce the feedwater flow and fuel volume.

[0023] When the main steam pressure drops to 23.3~23.5MPa, the automatic control system will appropriately reduce the reduction rate of the feedwater flow and fuel flow according to the current depressurization rate. If the depressurization rate is too fast, the system will increase the fuel flow and feedwater flow in advance , so that the main steam pressure slowly approaches the expected main steam pressure.

[0024] Through the adjustment in the previous step, the current main steam pressure will be closer to the expected main steam pressure. The system will judge according to the deviation between the current main ste...

Embodiment 2

[0027] For a supercritical once-through boiler, the current main steam pressure is 24MPa, the current main steam temperature is 540°C, and the superheat is 20°C. Set the expected main steam pressure to 20MPa, keep the current load and superheat Coal machine 3, after synchronously reducing the feed water flow and fuel volume, run stably for 1~3min. When the main steam pressure drops to 20.3~20.5MPa, appropriately reduce the feed water flow and fuel volume reduction rate depending on the current depressurization rate. In addition, Since the heat produced by the combustion of the unit has a certain lag after the amount of fuel is put into it, if the depressurization rate of the unit is too fast at this time, the amount of fuel and water supply should be appropriately increased.

[0028] When the main steam pressure is 0.1~0.3MPa lower than the expected main steam pressure, appropriately increase the feed water flow and fuel volume. The pressure deviation from the expected main st...

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Abstract

The invention discloses a method for improving main steam temperature of a super-critical once-through boiler. The method comprises the following steps: setting the expected main steam pressure P0 less than the present main steam pressure, manually or automatically controlling a system to reduce the present main steam pressure of the boiler so as to stabilize at the expected main steam pressure P0, retaining unit load and super-heat degree before pressure reduction, and increasing the main steam temperature along with reduction of the constant pressure heat capacity of the steam. The method can solve the problems that the vane service life is affected and the steam turbine operating security is threaten because the super-critical once-through boiler has the low main steam temperature, and the main steam temperature is only adjusted finitely in an existing technology so that actual production requirements cannot be met. The method belongs to the operation control technology field of the super-critical once-through boiler in a heat power plant.

Description

technical field [0001] The invention relates to a method for increasing the main steam temperature of a supercritical once-through boiler, and belongs to the technical field of operation control of supercritical once-through boilers in thermal power plants. Background technique [0002] Due to improper operation control of the supercritical once-through boiler, it is easy to cause the temperature of the main steam to be low, which not only affects the economy of the unit, but also increases the steam humidity of the last few stages of the steam turbine blades, causing cavitation of the blades, which intensifies the erosion of the blades, seriously Water hammer will occur, shorten the service life of the blades, and threaten the safe operation of the steam turbine. [0003] For the existing technology, under stable working conditions, the main steam temperature is mainly improved by adjusting the air distribution to change the flame center, thereby increasing the heat absorpt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22B35/00
Inventor 刘大猛罗小鹏
Owner ELECTRIC POWER SCI RES INST OF GUIZHOU POWER GRID CO LTD
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