Industry First: SLG Delivers -8°C Absorption Chiller Project for HY SOLAR

SLG has successfully secured the -8°C low-temperature absorption chilled water project for HY SOLAR.

This marks the first-ever -8°C absorption refrigeration application in the polysilicon industry, representing a major technological milestone of SLG.

Addressing a Long-Standing Industry Challenge

In polysilicon reduction tail-gas cooling processes, conventional systems rely on a cascade cooling approach:

7°C chilled water for pre-cooling

Followed by -25°C (or lower) electric refrigeration for final-stage cooling

This model presents two critical challenges:

Low Energy Efficiency
Electric chillers operate with relatively low COP, resulting in high electricity consumption and operating costs.

Energy Waste
Excess plant steam is often discharged directly, leaving large volumes of low- and medium-grade heat energy underutilized.

Technological Breakthrough: Redefining Energy Utilization

Leveraging decades of expertise in lithium bromide absorption technology, SLG has pushed the lower temperature limit of LiBr absorption systems down to -8°C, breaking long-standing technical boundaries.

Efficient Waste Heat Utilization
The system directly converts surplus plant steam into -8°C chilled water, transforming previously wasted thermal energy into valuable cooling capacity through cascade energy utilization.

Lower Cost, Lower Carbon
By replacing terminal electric refrigeration units, the project significantly reduces power consumption, helping control energy use per ton of polysilicon while meeting tightening national standards and dual-carbon targets.

Strong Economic Performance

Cooling capacity: 2,950 kW

Power reduction: approx. 1,770 kW

Annual electricity savings: 14.16 million kWh

Estimated annual economic benefit: approx. CNY 5.66 million

As the first -8°C low-temperature absorption refrigeration project in the polysilicon sector, the collaboration between SLG and HY SOLAR establishes a replicable and scalable benchmark for green transformation.

Driven by innovation and aligned with global decarbonization goals, SLG will continue pushing technological boundaries to enable sustainable and energy-efficient industrial development worldwide.