Method and device for controlling opening degree of external bed ash control valve

A control method and an external bed technology, applied in the field of boiler control, can solve the problems of reduced combustion efficiency, coordinated supply, unfavorable fuel volume and air volume, etc.

Active Publication Date: 2018-08-24
NORTH CHINA ELECTRICAL POWER RES INST +1
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  • Abstract
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Problems solved by technology

However, this scheme uses the bed temperature deviation as the adjustment target value, subject to the limitation of the accuracy of the bed temperature measurement, and uses the coal supply volume and the next secondary air volume as the bed temperature adjustment means. The two adjustment directions are opposite, which is not conducive to the fuel volume and air volume. Coordinated supply of , may result in reduced combustion efficiency

Method used

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  • Method and device for controlling opening degree of external bed ash control valve
  • Method and device for controlling opening degree of external bed ash control valve
  • Method and device for controlling opening degree of external bed ash control valve

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Embodiment Construction

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.

[0026] The technical terms involved in the embodiments of the present invention are briefly described below:

[0027] Circulating fluidized bed boiler: a boiler that uses the principle of circulating fluidized bed reactor to burn coal and other low-quality fuels. It is mainly composed of furnace, cyclone separator, return valve and tail flue. It is widely used in industrial steam supply and In the field of thermal power generation, it has outstanding advantages in environmental protection and comprehensive treatment of pollutants. figure 1 It is an example diagram of...

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Abstract

The invention discloses a method and a device for controlling the opening degree of an external bed ash control valve. The method comprises the following steps: determining the target value of the heat absorption capacity of a heated surface, corresponding to the ash inlet amount of an external bed, according to the actual load of a boiler; and adjusting the opening degree of the external bed ashcontrol valve to make the actual value of the heat absorption capacity of the heated surface reach the target value of the heat absorption capacity of the heated surface. The heat absorption capacityof the heated surface can be used as the target value of the opening degree control of the external bed ash control valve in order to reduce a steam temperature deviation caused by a bed temperature measurement error or a tail flue gas flow deviation.

Description

technical field [0001] The invention relates to the technical field of boiler control, in particular to a method and device for controlling the opening of an external bed ash control valve. Background technique [0002] The external bed is an important structural form of a large CFB (Circulating Fluidized Bed, circulating fluidized bed) boiler. It controls the heat absorption of the heating surface through the inlet ash control valve. An important means, where the heating surface generally has a medium temperature superheater, a high temperature reheater and so on. In boiler design, the external bed of the reheater is generally used to adjust the reheat steam temperature, and the external bed of the superheater is generally used to adjust the bed temperature in the lower part of the furnace. [0003] The prior art provides a commissioning scheme for the external heat exchanger of a supercritical circulating fluidized bed boiler, which specifically includes the following com...

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Application Information

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IPC IPC(8): F23C10/28
CPCF23C10/28
Inventor 李金晶赵振宁张清峰孙亦鹏李媛园
Owner NORTH CHINA ELECTRICAL POWER RES INST
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