Metering method and device for fuel coal of boiler

Abstract

The invention relates to a metering method and device for fuel coal of a boiler. The device comprises an overturning coal hopper, a chute-type support, a coal hopper lifting device, a weighing sensor, a coal metering controller, a coal hopper lifting sensor and a position sensor, wherein the chute-type support and the coal hopper lifting device are matched with the overturning coal hopper; the outputs of the weighing sensor and the lifting sensor are connected with the input end of the coal metering controller; the position sensor is arranged on a chute of the chute-type support; and the output of the position sensor is connected with the input end of the coal metering controller. By virtue of acquisition of multiple groups of signals and a real-time and sequential control method, the accurate calculation in the metering of the fuel coal can be automatically accomplished, and all external factors which influence the accurate metering of the fuel coal can be removed. The metering method and device can realize the automatic accurate metering of the fuel coil, and are high in practicability.

Description

technical field [0001] The invention relates to a metering method and device for boiler coal combustion. Background technique [0002] At present, there are mainly two types of methods for measuring coal used in coal-fired boilers. One is the method of manual measurement and statistics. To measure the amount of coal added, this kind of manual method has extremely poor measurement accuracy and is time-consuming and laborious. The second is to measure the coal consumption of the boiler in the form of a coal-fired metering device. This method mainly contains the following two technical solutions: one is that the Chinese patent document was disclosed on December 8, 2010 (the patent number is: 201010212025 .x) A technical solution for a measuring and weighing device for a coal-fired boiler, the weighing device includes a coal hopper provided with a rotatable rocker arm, a bracket provided with a rotating joint matched with the rocker arm, and the rocker arm is connected by a sli...

AI Technical Summary

Problems solved by technology

But there are following defects in this technical scheme: 1, load cell is installed under the coal scuttle, is used for measuring the total weight of coal burning and coal scuttle

However, due to the influence of the working environment of the coal-fired boiler, it is very easy to produce sundries on the load cell under the coal hopper, resulting in the failure or inaccurate measurement of the load cell

At the same time, because the boiler needs to spray water on the coal before adding coal, the load cell works in an environment with high humidity, which reduces the measurement accuracy and service life of the load cell

2. Since the shaft pin sensor is installed on the shaft of the coal hopper, the connecting wire of the sensor always rotates with the rocker arm of the coal hopper, which can easily cause the sensor connecting wire to be entangled, twisted or broken

This technical solution has the following deficiencies: 1. Because the system only uses the tension sensor to measure the coal, and does not take into account the influence of other factors on the device when weighing, other factors that affect weighing and measuring include the angle change of the wire rope , the torque force of the slideway and the friction force between the coal hopper and the slideway, etc., and these quantities are variable, which cannot be eliminated by the tension sensor alone, so this implementation method cannot guarantee its measurement accuracy and reliability.

2. The tension sensor is connected in series on the steel wire sling, and the connecting wire of the tension sensor always rises and falls with the coal hopper. Such a cycle of movement can easily cause the sensor connecting wire to be entangled, twisted or broken

[0003] In short, the existing measurement of boiler coal combustion has defects such as inaccurate measurement, poor reliability and practicability.

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