A limestone powder pneumatic conveying system and control method

Abstract

The invention relates to the pneumatic conveying technology, and discloses a pneumatic limestone powder conveying system. The pneumatic limestone powder conveying system specifically comprises a boiler, powder pipes and bin pumps. The powder pipes include the first-level large powder pipes and the first-level small powder pipes. The bin pumps include the large bin pump and the small bin pump. The large bin pump is connected with the first-level large powder pipes. The first-level large powder pipes are diverted by distributors into N second-level large powder pipes. The small bin pump is connected with the first-level small powder pipes. The first-level small powder pipes are diverted by distributors into N second-level small powder pipes. N is a natural number larger than one. Large powder adding ports and small powder adding ports are formed in the left side and the right side of the boiler, wherein the number of the large powder adding ports in the left side of the boiler is equal to the number of the large powder adding ports in the right side of the boiler, and the number of the small powder adding ports in the left side of the boiler is equal to the number of the small powder adding ports in the right side of the boiler. The large powder adding ports are connected with the second-level large powder pipes, and the small powder charging ports are connected with the second-level small powder pipes. The invention further discloses a control method of the above system. According to the different situations of work conditions, pneumatic conveying is conducted by adopting large pipelines or small pipelines or a manner of matching of the large pipelines and the small pipelines.

Description

technical field [0001] The invention relates to the technical field of pneumatic conveying, in particular to a limestone powder pneumatic conveying system and a control method. Background technique [0002] With the country's environmental protection policy and people's awareness of environmental protection, many power plants currently use pneumatic conveying technology to transport desulfurizers. Limestone powder is used as a desulfurizer, both powder and powder mixture, etc., will consume a lot of air volume during the transportation process, so how to achieve the best transportation effect with the least air consumption is particularly important. [0003] At present, the common limestone powder conveying system is usually designed to meet the maximum load of the boiler and the worst coal quality, the maximum amount of limestone powder, the limestone powder pneumatic conveying system is designed according to the maximum system output, and the diameter of the corresponding ...

AI Technical Summary

Problems solved by technology

When the delivery volume of limestone powder becomes smaller, the volume of compressed air for transportation is still provided according to the air consumption corresponding to the maximum delivery volume of limestone powder, because the air consumption cannot be reduced accordingly, otherwise, once it becomes smaller, the flow rate of limestone powder will decrease, which will lead to Plugging

Therefore, when the limestone powder pneumatic conveying system is in operation, it often causes a lot of waste of compressed air, which greatly affects the energy consumption of the entire unit operation

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