A solar lignite drying system with intelligent adjustment of fan power according to air inlet temperature

Abstract

A solar lignite drying system, including a solar heat collector and a drying device, air enters the solar heat collector through an induced draft fan, and absorbs solar energy in the solar heat collector to form hot air, which enters under the guidance of the fan A drying device for drying lignite; the hot air enters the drying device through an air inlet pipe, and a temperature sensor and a flow sensor are arranged on the air inlet pipe, and the temperature sensor is used to measure the temperature of the air entering the drying device, and the flow rate The sensor is used to detect the hot air flow of the drying device; the temperature sensor and the flow sensor are connected to the central controller for data; the central controller automatically controls the power of the fan according to the measured air temperature entering the drying device. The invention can intelligently control the size of the fan by utilizing the temperature of the hot air entering the drying device, and at the same time intelligently utilize solar energy to dry the lignite, saving energy and being environmentally friendly.

Description

technical field [0001] The invention belongs to the intersection field of solar energy and drying, in particular to a device and method for drying lignite by utilizing solar energy. Background technique [0002] Lignite is one of the main primary energy sources in the country. However, due to the characteristics of high moisture content, low calorific value, and easy spontaneous combustion, the large-scale development and utilization of lignite is greatly restricted. Whether it is from the perspective of the country's overall environment or from the perspective of corporate economic benefits, it is very important to research and promote the technology of lignite drying and dehydration to increase the calorific value of lignite per unit mass. The steam tube rotary lignite pre-drying system, after drying the wet lignite with high moisture content in the steam tube rotary dryer, it is sent to the pulverizing system equipped with a medium-speed coal mill for grinding, and then b...

AI Technical Summary

Problems solved by technology

Due to the high volatile content of lignite, it is easy to catch fire and burn due to the influence of the inlet air temperature, the drying efficiency is low, and the equipment is huge and the investment cost is high.

The latter uses high-grade energy superheated steam as a heat source, which is expensive and consumes a lot of energy, which is not suitable for my country's national conditions.

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