Water ring, resistance reduction device, low-resistance coal slime delivery pipeline and resistance reduction method

Abstract

The invention discloses a water ring, a resistance reduction device, a low-resistance coal slime delivery pipeline and a resistance reduction method. The delivery pipeline comprises the resistance reduction device and a coal slime pipeline provided with the resistance reduction devices. Each resistance reduction device comprises the water rings, water pipes and switch valves arranged on the corresponding water pipes, wherein the water rings are arranged on the coal slime pipeline. Each water ring comprises a ring core and a water jacket which are arranged in a coaxial sleeve form, wherein thewater jacket is arranged on the outer side of the ring core and is fixedly connected with the ring core; an interlayer is arranged between the water jacket and the ring core; the water jacket is provided with a water inlet hole communicating the interlayer with the corresponding water pipe; the front end of the water jacket and the front end of the ring core are uniformly shrunk into a conical surface, and a water ring gap with the width h is formed between the front end of the water jacket and the front end of the ring core and communicates with the interlayer. Each resistance reduction device comprises a plurality of water rings arranged along the coal slime pipeline at intervals, or the resistance reduction device comprises the water rings and the switch valves arranged in a one-to-onecorrespondence mode. A plurality of resistance reduction devices are arranged along the coal slime pipeline at intervals. High-pressure water forms a water film on the surface of a coal slime column through the water rings so as to reduce resistance. The water ring, the resistance reduction device and the low-resistance coal slime delivery pipeline have the advantages of being simple in structureand good in resistance reduction effect.

Description

technical field [0001] The invention relates to a water ring, a drag reducing device, a low-resistance coal slime conveying pipeline and a drag reducing method, belonging to the field of energy engineering. Background technique [0002] Coal slime is a by-product of the coal washing process, which is the product obtained after the coal washing slurry is dehydrated by pressure filtration. It has high water content, high ash content and low calorific value. It is not economical to transport it out, and direct disposal and storage will bring harm to the environment. As a clean coal technology, circulating fluidized bed boiler combustion technology has the advantages of strong adaptability to coal types, high desulfurization efficiency in the furnace, and low NOx emissions. The use of circulating fluidized bed boilers to burn coal slime for power generation can not only reduce the discharge of coal slime, but also reduce the fuel cost of boiler operation, and has been widely u...

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Problems solved by technology

However, because the coal slime burned in the furnace is a high-concentration viscous material with a large mass concentration and a large yield stress, under the existing conditions, long-distance pipeline transportation of high-concentration coal slime paste has a lot of resistance to overcome , the energy consumption of the auxiliary machine is high, and it is easy to cause pipeline wear

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