Self-checking method for belt middle mechanical sampling device

Abstract

A self-checking method for a belt middle mechanical sampling device comprises the following steps: continuously sampling 80 sub-samples on a belt, pouring all odd-numbered samples from an observation hole of a feeder, respectively collecting the odd-numbered samples at a sample receiver to serve as machine samples, and taking all even-numbered samples as reference samples for comparison; making each machine sample and the reference sample into a total moisture coal sample and an analysis test coal sample; measuring the total moisture, the air dry basis moisture and the air dry basis ash content of each total moisture coal sample and each analysis test coal sample; and judging whether the sampling and sample preparation device is qualified or not according to the measured total moisture, the air dry basis moisture and the air dry basis ash content. The method is used for self-checking of a belt middle mechanical sampling and sample preparation device, the belt only needs to be started and stopped once, and damage to the belt is small. Self-checking efficiency is high, sampling time is short, and daily production of a power plant is not affected. The mechanical sampling device in the middle of the belt is not additionally changed, and the problems of equipment disassembly and assembly and the like in the self-inspection process are avoided.

Description

technical field [0001] The invention belongs to the technical field of power generation in coal-fired thermal power plants, and in particular relates to a self-inspection method for a mechanical sampling and preparation device in the middle of a belt. Background technique [0002] The raw coal used for power generation in coal-fired thermal power plants will be sampled before being transported into the boiler by belts. The sampling tool generally uses a mechanical sampling device in the middle of the belt. The standard stipulates that mechanical sampling and preparation devices generally need to be tested by an authoritative organization every two years, and can only be used after passing the test. Due to the long-term operation of the mechanical sampling and preparation device, all components have different degrees of wear and tear, and the performance is not as good as before. In addition to the changes in the domestic coal market environment, the coal used for the operati...

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Problems solved by technology

However, the sampling process of this method requires frequent start and stop of the belt with load, which causes great loss to the belt motor, and the sampling time is long, usually 3 to 5 days, which seriously affects the daily production of the power plant. Some mechanical sampling devices in the middle of the belt also need Disassembly and assembly, for power plant employees with heavy production tasks, it is too difficult to use this method for self-inspection

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