Dust collection device for vibration bed mixed flow dryer

Abstract

The invention relates to a dust collection device for a vibration bed mixed flow dryer. The device comprises a dryer, and at least one primary cyclone dust chamber and at least one secondary cyclone dust chamber which are connected with the dryer through a pipeline in turn; a steam humidifier is arranged in an outlet pipeline on the top of the primary cyclone dust chamber; a sprayer is arranged at an inlet of the secondary cyclone dust chamber; and the dryer is positioned in a micro negative pressure state and has an inner negative pressure value of -90 to -110Pa. A secondary cyclone dedusting and demisting integral structure is adopted, namely different equipment operating parameters and different dedusting processes are adopted for a secondary cyclone dust collection device respectively so as to achieve a two-stage complementary dedusting effect, namely large-particle coal dust is recovered through primary dry cyclone dedusting, and small-particle coal dust is removed through secondary humidifying, spraying and demisting so as to meet an emission standard.

Description

technical field [0001] The invention relates to a dust removal device, in particular to a dust removal device for a vibrating bed mixed-flow dryer. Background technique [0002] In the mining process of many coal mines, the raw coal extracted from some mines often has a high moisture content. For example, the moisture content of raw coal produced in some mines is about 28% (such coal is also called simmering coal), and after being washed by coal washing plants, the moisture content will be more than 30%. Because the moisture in the coal is very high, therefore, cause the calorific value of the coal to be low, the calorific value of the product coal after washing is between 4600-4700Kcal / kg, the coal price is very low and it is difficult to open up the market. This requires the use of drying methods to reduce coal moisture, in order to increase the calorific value of coal. Using a vibrating bed mixed flow dryer to reduce coal moisture is one of the drying methods. [0003]...

AI Technical Summary

Problems solved by technology

Seriously restrict the hot air passing capacity of the dryer and the ventilation cost is high, the drying capacity is only about 50% of the design capacity; the equipment has poor reliability, low efficiency and high comprehensive cost

[0009] 2. Due to the large resistance of the bag filter during normal operation and it is located in the middle of the outlet air duct of the dryer, the air flow outlet of the dryer is seriously blocked, so that the internal air pressure of the dryer is higher than the atmospheric pressure when the dryer is running.

Because there are coal flow openings on the upper and lower sides of the dryer and the joints of the dryer itself cannot be tight and airtight, the dusty gas in the dryer leaks out under the action of the difference in internal and external air pressure, resulting in serious dust in the workplace, and , making it extremely difficult to control coal dust in the working environment

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