Medium to low temperature pure waste heat power generation: through water or steam, when the waste gas is discharged, the temperature difference causes the waste gas to be converted into heat energy and put into the production line.

Waste heat power generation equipment includes steam turbine generator, waste heat boiler, and thermal equipment.

2.

The waste heat power generation technology in cement plants is generally divided into three categories: 1.

This article is the fourth part of the low-carbon transformation path of the cement industry – technological innovation.

Lifting Insert

Organic Rankine cycle waste heat power generation: The principle of Rankine cycle waste heat power generation is a common method of waste heat power generation in cement production lines.

Hybrid system waste heat power generation: Hybrid system waste heat power generation can target the secondary recovery of energy loss caused by the absorption and conversion of heat energy by a certain medium, effectively improving the energy absorption rate of waste heat and reducing heat loss.

If directly discharged into the atmosphere, it will cause serious energy waste.

Waste heat power generation technology 1-2 In cement production, cement kilns emit a large amount of medium to low temperature waste gas at around 350 ℃, accounting for about 30% of the total fuel heat input.

It is worth noting that the quality and quantity of waste heat and exhaust gas will affect the efficiency of the steam turbine generator and thus have a significant impact on the scale of waste heat power generation
.

Therefore, fully utilizing the waste heat of medium and low temperatures for power generation plays an undeniable role in energy conservation and emission reduction in the cement industry.

However, due to the content and composition of the waste gas cannot be guaranteed, the efficiency of pure waste heat power generation also fluctuates, and the energy provided is relatively unstable.

3.

At present, experts and researchers have developed organic Rankine power generation technology based on the Rankine cycle waste heat power generation.

Among them, steam turbine generator is a key equipment in waste heat power generation technology, which fully absorbs waste heat and waste gas, converts heat energy into electrical energy, provides operating power for the generator, and provides electricity for the cement plant production line.

Due to certain requirements for the temperature of waste gas waste heat, the temperature must be above 360 degrees, otherwise the supply of thermal and electrical energy cannot be guaranteed, and the recovery efficiency of waste heat will be affected.

When the temperature of waste gas waste heat is low, it can enable organic media with lower boiling points to fully absorb waste gas waste heat to provide heat energy for work in the steam turbine, successfully forming energy conversion, and effectively solving the problem of insufficient utilization of waste gas waste heat at low temperatures.

Cement kiln waste heat power generation refers to the recovery of waste heat and gas discharged from the kiln head and tail during the clinker calcination process of the cement kiln, and the steam generated by the waste heat boiler drives the steam turbine generator to generate electricity.

Qingyue will mainly introduce the waste heat power generation technology (EHR) and carbon capture, storage, and reuse technology (CCUS) of the low-carbon transformation of cement.