High Temperature Resistant Star Shaped Unloader

The high-temperature resistant star shaped unloader is a discharge device suitable for high-temperature working conditions of 150-600 ℃. It is named after the star shaped structure of the core component impeller and is mainly installed at the bottom of the high-temperature dust collector ash hopper and industrial kiln material bin. It achieves continuous and uniform discharge of high-temperature dust (such as cement kiln dust, metallurgical furnace dust, boiler fly ash) in a closed state, while blocking the backflow of high-temperature airflow. It is widely used in high-temperature dust treatment industries such as building materials, metallurgy, power, and garbage incineration, and is a key equipment to protect the stable operation of high-temperature dust removal systems.

Its working principle is based on "star shaped impeller closed conveying": the equipment body is a high-temperature resistant shell, and the internal star shaped impeller (usually 6-12 blades) is driven by a high-temperature resistant motor through a reduction mechanism, rotating at low speed (5-30r/min); High temperature dust falls into the chamber between the impeller blades from the upper feed inlet, and is discharged from the lower discharge outlet as the impeller rotates. The fine fit between the blades and the shell (with a gap of 0.2-0.5mm) can prevent the backflow of high-temperature airflow and avoid dust leakage; For higher temperature conditions (>400 ℃), some equipment will be equipped with cooling jackets to reduce the temperature of the casing and impeller through circulating water or compressed air, protecting the transmission components.

The structural design focuses on "high temperature resistance and practicality": firstly, material selection. The shell and impeller are mostly made of high temperature resistant steel (such as 304 stainless steel, 16MnR, Cr25Ni20 heat-resistant steel), which can withstand different temperature ranges of 150-600 ℃ to avoid deformation or corrosion at high temperatures; The second is transmission protection. The motor and reduction mechanism use high-temperature resistant seals (such as graphite packing and metal bellows seals) to prevent high-temperature dust from entering. At the same time, high-temperature resistant bearings (such as ceramic bearings and ball bearings lubricated with high-temperature grease) are equipped to confirm stable transmission; The third is anti blocking design, with wear-resistant (based on actual reports) alloy layers (such as tungsten carbide coating) installed on the edges of the impeller blades to reduce high-temperature dust erosion and wear. The inner wall is polished to avoid dust adhesion and accumulation.

The core advantages are reflected in three aspects: firstly, it has good high temperature resistance, and can be customized with different heat resistance levels according to working conditions, suitable for high temperature dust of 150-600 ℃, meeting the requirements of harsh scenarios such as building materials cement kilns (300-450 ℃) and metallurgical blast furnaces (400-550 ℃); The second is stable unloading without backflow. The sealed structure of the star shaped impeller can effectively block the backflow of high-temperature airflow to the dust collector or silo, avoiding system pressure imbalance, and achieving continuous unloading to prevent dust from blocking the ash hopper; Thirdly, it has a long service life. The high-temperature resistant material and wear-resistant (based on actual reports) design make the equipment have a service life of 3-5 years, far exceeding that of ordinary star shaped unloaders (1-2 years), reducing the frequency of maintenance and replacement.

Typical application scenarios include: building materials industry (high-temperature dust discharge from cement kiln tail dust collectors), metallurgical industry (ash discharge from steel blast furnace gas purification systems), power industry (fly ash discharge from coal-fired boiler high-temperature electrostatic precipitators), and waste incineration (ash discharge from high-temperature flue gas dust removal in incinerators). Currently, the high-temperature resistant star shaped unloader is undergoing intelligent upgrades (by installing temperature sensors and torque monitoring modules) to achieve abnormal warning and further improve its operational safety under high temperature conditions.