Control device and method for decreasing carbon content of fly ash of 300MW coal-fired unit

Abstract

The invention discloses a control device and method for decreasing carbon content of fly ash of a 300MW coal-fired unit. The device comprises a first primary air pipe for connecting a first primary fan with a first dust bin, a second primary air pipe for connecting a second primary fan with a second dust bin, a first air pre-heater and a second air pre-heater, wherein a controlled interconnectionvalve of a primary air head pipe of an air pre-heater outlet is arranged on the primary air head pipe of the air pre-heater outlet and is used for controlling the connection and disconnection of the primary air head pipe of the air pre-heater outlet. According to the technical scheme, the device has the technical effects that the primary fans at the left side and the right side are independently controlled to achieve different capacities, thus different primary air pressure can be generated, and as a result, different types of coal dust of the two coal dust bins can be conveyed and can synchronously combust while a boiler runs; thorough combustion is achieved; and the purposes of decreasing the carbon content of the fly ash and improving the boiler combustion efficiency can be achieved. With the adoption of the device and the method, the annual average reduction amount of the carbon content of the coal dust is 3.5% or over; and the annular average net coal consumption rate is reduced by 4.4 g standard coal per kilowatt hour.

Description

technical field [0001] The invention relates to the field of coal-fired unit control, in particular to a control device and method for reducing the carbon content of fly ash of a 300MW coal-fired unit. Background technique [0002] Since 2011, the utilization hours of generating units in my country have generally shown a continuous downward trend, and the two ministries and commissions issued the 2016-2020 planning requirements for electric power development. During 2016-2020, we will strive to eliminate thermal power outdated production capacity of more than 20 million kilowatts, and the average power supply of new coal-fired generating units Coal consumption is less than 300 grams of standard coal / kWh, and the average coal consumption of the existing coal-fired generating units after transformation is less than 310 grams of standard coal / kWh. The development of thermal power will face a more severe situation. Coal-fired units are required to work hard on energy saving and c...

AI Technical Summary

Problems solved by technology

[0016] In order to solve the technical problem that the same primary air pressure on both sides of the outlet of the air preheater cannot satisfy the mixed combustion of two types of coal with large differences in volatile content at the same time, the present invention provides a 300MW air pressure adjustment system that can adjust the air pressure for different types of coal with different volatile content. Control device and method for reducing carbon content in fly ash of coal-fired units

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