Method for starting once-through boiler with boiler circulating pump when boiler circulating pump breaks down

A boiler water circulating pump and once-through furnace technology, which is applied to boiler cleaning control devices, control systems, steam generation, etc., can solve problems such as starting methods that cannot be used to solve problems, and achieve the effect of recovering economic losses.

Inactive Publication Date: 2017-02-01
FUJIAN HONGSHAN THERMOELECTRICITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technical solution is to control the heating of the cooling plate and cannot be used to solve the starting method

Method used

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  • Method for starting once-through boiler with boiler circulating pump when boiler circulating pump breaks down

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Experimental program
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specific Embodiment approach

[0024] like figure 1 As shown, the conditions that should be met in the early stage are as follows:

[0025] 1. The system of this method adopts a built-in starting system with a recirculation pump; the system is simple and reliable, easy to operate, small in steam temperature disturbance, and conducive to the safe operation of the steam turbine; Recover the hydrophobic energy of the separator; according to the design requirements of the boiler performance, when the load is above 30% MCR, the bypass system will be decoupled and the separator will be in dry operation. At this time, the separator will only function as a steam circulation header and the system will be started Designed according to full pressure;

[0026] The starting system consists of the following equipment and pipelines:

[0027] (1) Start the separator and the inlet and outlet connecting pipes;

[0028] (2) Water storage tank;

[0029] (3) Overflow pipe and overflow valve;

[0030] (4) Hydrophobic expand...

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Abstract

The invention discloses a method for starting a once-through boiler with a boiler circulating pump when the boiler circulating pump breaks down. The method specifically comprises the starting steps that the boiler starts to be cleaned; the water temperature of a deaerator is gradually increased while the boiler starts to the cleaned; when the boiler is ignited, the feedwater flow of an inlet of a coal economizer is controlled to be 500 t/h; after the boiler is ignited, power of a starting drainage pump A is controlled to be 16 t/h; the drainage pump runs when the boiler is started; combustion is intensified properly while impulse starting and grid connection are carried out; the opening degree of a bypass needs to be adjusted in time as needed; when the boiler is switched to the dry state, the overflow quantity of a water storage tank is zero, the boiler has no medium loss any more, and switching between the dry state and the wet state is carried out with the load ranging from 180 MW to 240 MW; and after the boiler is switched to the dry state, startup without starting the circulating pump is completed. The method ensures that a system can start a unit safely when the boiler circulating pump breaks down, and great economic losses caused after the primary device breaks down and a boiler cannot be started are recouped for business owners.

Description

technical field [0001] The invention relates to the field of generator sets, in particular to a method for starting a direct current boiler with a boiler water circulation pump under the condition of a failure of the boiler water circulation pump. Background technique [0002] The advantages of the built-in generator set with boiler water circulation pump starting system are simple and reliable, easy to operate, small disturbance of steam temperature, conducive to the safe operation of the turbine, and the separator can be recovered when the turbine starts and stops and operates at low load (<30%) Hydrophobic energy, recovery of working fluid, large flow water flushing of the boiler, small wall thickness, low thermal stress, flexible startup and shutdown of the boiler, etc. The boiler water circulation pump is an important core equipment of the system. If the boiler water circulation pump fails, various difficulties and uncertain factors will be encountered during the sta...

Claims

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Application Information

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IPC IPC(8): F22B35/00F22B37/56
CPCF22B35/00F22B37/56
Inventor 李建设张维明李清华李秉正杨润生陈少毅欧炳容
Owner FUJIAN HONGSHAN THERMOELECTRICITY
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