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Boiler soot blowing control device based on flue fly ash mass flow

A mass flow, boiler soot blowing technology, applied in thermal power engineering and its automation field, can solve the problems of increased contamination model error, poor stability and adaptability, poor real-time performance, etc., to save maintenance workload and improve boiler efficiency , the effect of reducing boiler failure

Inactive Publication Date: 2012-07-04
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the complexity of the boiler object, coupled with changes in boiler operating conditions and frequent fluctuations in coal types and coal quality, the error of the contamination model will increase, and the stability and adaptability will be poor.
Moreover, there is usually a long lag time from the contamination of the heating surface to the change of the thermal parameters, and its real-time performance is also poor.
Therefore, the actual application effect of the boiler soot blowing strategy based on the contamination model is not ideal

Method used

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  • Boiler soot blowing control device based on flue fly ash mass flow
  • Boiler soot blowing control device based on flue fly ash mass flow
  • Boiler soot blowing control device based on flue fly ash mass flow

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Embodiment Construction

[0038] Such as figure 1 As shown, during the pneumatic conveying process of the fly ash particles in the flue, on the one hand, they will collide, rub and separate with the flue wall, and on the other hand, there will also be collision, friction and separation between the fly ash particles. Such a large number of close contact and separation processes can make fly ash particles carry a considerable amount of electrostatic charge. The charged fly ash particles will generate a certain electrostatic field. When the charged fly ash particles pass through the metal induction probe, the probe surface in the electrostatic field will generate an equal amount of induced charges, and absorb the charges by contacting the fly ash particles. When ash particles flow through the probe, a current is formed on the probe, and the magnitude of the current is related to the mass flow rate of the fly ash particles flowing through the probe. The induced current is used as the measurement signal, an...

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Abstract

The invention discloses a boiler soot blowing control device based on flue fly ash mass flow, which comprises a soot blower, a charge inducing sensor, a signal processing module and an industrial personal computer for controlling the soot blower, wherein the charge inducing sensor is installed in a tail flue of a boiler and used for measuring the induced current of a fly ash particle cloud cluster; the signal processing module is connected with the charge inducing sensor and used for carrying out A / D (Analog to Digital) conversion and filtering on the induced current to obtain flue fly ash mass flow M; and the industrial personal computer controls the work of the soot blower according to a signal transmitted by the signal processing module. The invention can be used for all coal-fired power plants, realizes control on the running of all pulverized coal boiler soot blowers and can maintain the stability of boiler hearth outlet temperature and main steam temperature, improve the boiler efficiency, reduce the boiler failure, prolong the service life of the soot blower, save the maintenance workload of the soot blower, and the like.

Description

technical field [0001] The invention belongs to the technical field of thermal power engineering and automation thereof, and in particular relates to a boiler soot blowing control device based on the mass flow rate of flue fly ash. Background technique [0002] The safe and economical operation of power plant boilers is facing the threat of complex coal types and variable coal quality. One of the prominent problems caused is serious ash slagging in the heating area. Power plant boilers in my country are equipped with corresponding steam soot blowing systems, which are used to blow off the ash and slagging deposited on the heating surface. Regularly and regularly clean the heating surface in sequence. Such purging methods are all carried out without knowing the exact contamination of the heating surface. In fact, it is difficult to determine the time of each purging and the time interval between two purgings. As a result, the purging is insufficient, Or cause excessive purgi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23J1/00F22B35/00
Inventor 宋兆龙
Owner SOUTHEAST UNIV
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