Method for automatically accumulating conveying capacity in powdered coal conveying process

Abstract

The invention relates to a method for automatically accumulating the conveying capacity in a powdered coal conveying process, which comprises the following steps that: a powdered coal conveying tank, a feed valve and a material conveying valve are used, a weighing sensor is arranged below each supporting leg of the powdered coal conveying tank, and a signal which is generated by the weighing sensor and has certain functional relation with the weight of the tank is transmitted to a weighing control display and is then converted into a standard direct current signal of 4 to 20 mA which is transmitted to a distributed control system through a signal cable; the distributed control system configures out two recorders, and the actions of the feed valve and the material conveying valve trigger the two recorders respectively; the recorders record the tank weight value when the feeding is finished and the tank weigh value when the material conveying is finished, subtract the two tank weight values to obtain the single-time conveying capacity, and perform superposition operations through an addition arithmetic unit to finally obtain the accumulated conveying capacity of the powdered coal. The method has high metering accuracy and few interference factors, can effectively relieve the problem of zero drift of an instrument and reduce the construction investment, and has high automatic degree and less maintenance workload.

Description

technical field [0001] The invention relates to a method for automatically accumulating the delivery volume in the intermittent delivery process, in particular to an automatic accumulation method for the delivery volume in the pulverized coal delivery process. Background technique [0002] At present, the cumulative measurement method of engineering quantity is generally realized by integral operation of material flow velocity and instantaneous measurement value. The characteristic of applying this method to cumulative metering is to realize the cumulative metering function by installing a flowmeter or a belt scale (a metering device composed of a load cell and a speed sensor) in the conveying device. The investment of the above method is quite high, the belt scale must be calibrated regularly, and the automatic control professional maintains a large workload, while the flowmeter measurement has strict requirements on the fluid, which is easily affected by interference facto...

AI Technical Summary

Problems solved by technology

The investment of the above method is quite high, the belt scale must be calibrated regularly, and the automatic control professional maintains a large workload, while the flowmeter measurement has strict requirements on the fluid, which is easily affected by interference factors such as temperature, pressure, density, viscosity, flow state, etc., and the accuracy is difficult to guarantee. , and the cause of the measurement error is difficult to analyze. Since the material fluid in the pulverized coal transportation process is very unstable and is a pulsating fluid, the measurement error of the application of the flowmeter is relatively large. The delivery volume also has a large error, and it cannot overcome the zero drift problem of the instrument measurement system itself.

Images