Soft Meter of Pulverized Coal Delivery Based on Roots Blower Air Pressure

Abstract

Disclosed is a Roots blower pressure based pulverized coal throughput soft-sensor. In industrial productions, such as chemical industry, electric power, cement and metallurgy, pulverized coal delivery stability is one of important preconditions for stable combustion of pulverized coal and is closely related to product quality and equipment safety; whereas, the traditional pulverized coal metering device (rotor scale) is easily jammed due to its design flaws, and inaccurate pulverized coal metering is caused. The pulverized coal throughput soft-sensor is established through Roots blower pressure. Input of the soft-sensor includes Roots blower pressure, Roots blower static pressure, powder flow coefficient, correction factor and the like, while output includes pulverized coal throughput. Typical application cases include with a coal feed soft-sensor established on basis of Roots blower pressure, intelligent recognition of pulverized coal throughput anomaly, automatic correction of pulverized coal throughput and the like. An automatic correction method of pulverized coal throughput has the advantages that no hardware investment is increased, the method can be quickly performed in real-time calculation supporting systems such as a DCS (distributed control system) and a real-time database, and cost performance is high.

Description

technical field [0001] The invention relates to the field of automatic control instruments, in particular to a soft instrument for determining the pulverized coal conveying amount by measuring the air pressure of a Roots blower in the industrial production process. Background technique [0002] As an important fuel, coal is widely used in cement, metallurgy, chemical industry, electric power and other process industries. In order to ensure uniform and stable coal combustion, during the production process, the raw coal will first be processed by a coal mill to obtain pulverized coal with uniform fineness and low moisture content. Then, the pulverized coal will be accurately metered by the metering device, and then the pulverized coal will be sent into the combustion chamber by the Roots blower. [0003] In order to ensure uniform and stable combustion, it is very important to accurately measure the amount of coal fed: too much coal injection can easily lead to excessively hi...

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Problems solved by technology

[0006] In order to overcome the defects of the rotor scale, the present invention proposes to use the correlation between the wind pressure of the Roots blower and the pulverized coal delivery volume of the downstream equipment of the rotor scale to establish a soft instrument for the pulverized coal delivery volume to solve the inaccurate measurement of the rotor scale The problem

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