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Energy-saving type quick start method for supercritical unit or ultra-supercritical unit

A fast-starting, energy-saving technology, applied in separation methods, chemical instruments and methods, boiler cleaning control devices, etc., can solve the problems of slow boiler temperature rise and pressure rise, huge fuel consumption, and long unit start-up time, etc. Achieve the effect of accelerating the temperature rise rate, eliminating dry burning, and eliminating hydrodynamic problems

Active Publication Date: 2014-04-09
冯伟忠
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, if the adjacent steam heating method is not used, at the initial stage of boiler ignition, due to the low temperature of the working medium in the water wall, the thermal stress of each component of the boiler is relatively large; at this time, the superheater and reheater will still be in the "dry burning " state, in order to reduce the thermal stress of various parts of the boiler and reduce the damage caused by "dry burning" to the boiler, the heating and pressure raising speed of the boiler can only be very slow, so when this method is used to start the unit, the time it takes for the unit to start is still very long. Fuel and plant power consumption are still huge

Method used

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  • Energy-saving type quick start method for supercritical unit or ultra-supercritical unit
  • Energy-saving type quick start method for supercritical unit or ultra-supercritical unit
  • Energy-saving type quick start method for supercritical unit or ultra-supercritical unit

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no. 2 Embodiment

[0053] Such as figure 2 It is the second specific embodiment of the present invention, and the method of this embodiment and above-mentioned first embodiment is basically the same, and difference is to set up the pressurization on the pipeline of atmospheric type expander and drain tank 16 to deaerator 2 and pipeline Pump 25, to recover the water supply working medium. Therefore, preferably, in step b, a pipeline and a booster pump can be installed after the atmospheric expander drain tank, and connected to the deaerator to recover the feed water working medium.

no. 3 Embodiment

[0054] image 3 It is the third specific embodiment of the present invention, this embodiment and figure 1 The difference is that the pipeline from the steam-water separator drain tank 14 to the deaerator 2 and the regulating valve 24 on the pipeline are added to recover the water supply working medium and heat. relatively figure 2 In this embodiment, not only the working medium of the feed water can be recovered, but also part of the heat of the feed water can be recovered, but a high-pressure regulating valve 24 is required, and the initial investment will increase relatively. Therefore, preferably, in step b, a pipeline and a regulating valve can be installed behind the drain tank of the steam-water separator and connected to the deaerator to recover the feedwater working medium and its heat.

[0055] Preferably, in step d, the flow rate of main steam and reheat steam and the rate of temperature and pressure increase are controlled by controlling the opening of the bypas...

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Abstract

The invention discloses an energy-saving type quick start method for a supercritical unit or an ultra-supercritical unit. According to the method, steam from another resource is used for heating supplied water so that a boiler can be indirectly heated, and the thermal stress of a heated surface is reduced when the boiler is started so that the heating rate of the boiler can be improved; meanwhile, the heated high-temperature supplied water is converted into steam-liquid two-phase flow through throttling and pressure reduction, the flowing scouring action of the steam-liquid two-phase flow is far superior to the effect of thermal-state washing, and in other words, the boiler can complete thermal-state washing under the non-ignition condition, and can preheat the whole heated surface before ignition till certain pressure is reached. After ignition of the boiler, due to the fact that enthalpy of subcooling on an inlet of a water wall is eliminated, the problem of water power can be readily solved and the input speed of fuel can be increased. Meanwhile, by adjusting the open degree of a turbine bypass valve, the flow, the temperature rising speed and the pressure rising speed of main stream and reheat steam are controlled, and the temperature rising speed of the heated surface of the boiler is increased; when the temperature of the main steam and the temperature of the reheat steam are larger than the temperature of a turbine heating valve, valve heating is started, and a main machine can early satisfy the impulse starting condition.

Description

technical field [0001] The invention relates to an energy-saving quick start method for a super (super) critical unit, which belongs to the field of thermal coal-fired generating units. Background technique [0002] With the increasingly mature technology of coal-fired power plants and the continuous improvement of environmental protection requirements such as energy conservation and emission reduction, supercritical and ultra-supercritical parameters have been generally adopted for large thermal power units. At present, there are mainly two starting methods for these units: drain expansion type and boiler water circulation pump type. In these two start-up methods, the deaerator needs to be heated before the boiler enters the water, and the feed water is heated to the feed water temperature required by the boiler (generally around 105°C, different boiler manufacturers have different regulations on this), and then the boiler Water supply: while the boiler is being supplied w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22D1/50F22B37/56F22B35/00
Inventor 冯伟忠
Owner 冯伟忠
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