Fuel conveying method and equipment of boiler for burning crop straws

Abstract

The invention relates to a fuel conveying method of a boiler for burning crop straws. By utilizing a method of relative moving and rolling of materials during feeding in a burner, the materials of a feed inlet are moved and rolled through a moving type impeller feeding device and a roller type feeder and then reenter the burner. The method can reduce the operation cost, realize uniform and stable feeding and reduce equipment damages. Equipment designed by the method mainly comprises a material cabin, a moving type impeller feeding trolley, an upper blanking pipe, the roller type feeder and a lower blanking pipe. Fragmental crop straw materials pretreated by smashing in a size of 5-25mm or a larger size are sent into the material cabin, and the moving type impeller feeding trolley at the bottom of the material cabin is used for feeding the materials; straw fragmental materials coming out of the moving type impeller feeding trolley fall on the upper blanking pipe; and then crop straw fuels are sent into a boiler through the lower blanking pipe of the roller type feeder.

Description

technical field [0001] The invention relates to a fuel delivery method and equipment for a boiler that burns crops and orange stalks, and belongs to a fuel delivery method and equipment at a burner inlet. technical background [0002] Crop straw is a by-product of agricultural production with large output and wide distribution. It is an environmentally friendly, clean and renewable biomass energy. Clean and efficient use of crop straw to produce biomass energy is an important energy strategy in the world. At present, combustion technology is an important technology for utilizing crop straw. This technology can convert this low-quality energy into high-quality energy, and has significant economic, social and environmental benefits. [0003] In the industrial application of crop straw combustion technology, especially in boiler combustion applications, continuous and stable feeding is very important. At present, there are mainly several fuel pretreatment and delivery methods...

AI Technical Summary

Problems solved by technology

At present, there are mainly several fuel pretreatment and delivery methods for boilers burning crop straws at home and abroad: one method is to use the conventional coal delivery system to put the crushed and granulated straw pellets into the boiler for combustion through the conveyor belt. The pretreatment method has high processing costs due to the complexity of the pellet forming process; one method is to use a specific feeding device, such as a propulsion feeding device, a screw feeding device for fuel delivery, but this type of feeding device has a high impact on the fuel. Strict size requirements, only for narrow screening, single-scale, small-size granular materials, and even if such materials are used, in actual operation, there are often "overlapping" and "arching" in the silo and improper feeding of the feeding device. Chang and other problems; one method is to chop strips of crop straw into 10-200mm strips and then feed them into the feeding device, but the strips after chopping have low bulk density and large size Different, complex shapes, interlaced and other characteristics, often appear "bridge" and "arch" phenomenon in the silo, unable to enter the feeding device smoothly

In addition, when the existing conventional feeding device transports this type of crop straw, there will be problems such as blockage or even damage to the equipment

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