China's First Large-scale Coal-fired Power Plant ORC Low-temperature Waste Heat Power Generation Pilot Platform Was Put Into Operation

On December 30, 2024, the first organic Rankine cycle (ORC) low-temperature waste heat power generation pilot platform based on a large coal-fired power plant in China was put into operation at Kaizhou Power Generation Company of Chongqing Company.

The pilot platform was jointly developed and constructed by Chongqing Green Energy Company, Shanghai Complete Set Research Institute, Hunan Electric Power and other internal and external units of the system. It uses the continuous discharge of sewage from the steam drum of Kaizhou Power Generation Company as the heat source, and integrates a number of cutting-edge technologies such as high-efficiency magnetic levitation, integrated high-speed permanent magnet centripetal turbine generator, and advanced digital electronic control. It aims to explore feasible paths for energy conservation, emission reduction, and green development, and help China achieve its "3060" goals.

During the construction process, all parties involved in the construction carefully planned, overcame difficulties, strictly controlled the progress of the project, and ensured that the project was completed on schedule. The commissioning of the pilot platform is expected to provide 1.3 million kilowatt-hours of clean electricity to Kaizhou Power Generation Company each year, reduce carbon dioxide emissions by about 1,600 tons, and play a demonstration and leading role in the green and low-carbon development of enterprises.

ORC Industrial Low-Temperature Waste Heat Power Generation

I. INTRODUCTION:

In the production process of many industrial fields such as steel, chemical industry, nonferrous metallurgy, cement, etc., a large amount of waste heat resources will be generated, including hot water, hot air, radiant sensible heat, etc. At present, high-pressure or high-temperature waste heat has been fully utilized. However, a large amount of low-temperature waste heat resources (below 250℃, low pressure or normal pressure) have not been fully utilized due to the lack of effective technical means, or can only produce low-grade recovery (such as hot water, etc.). The working parameters of traditional waste heat power generation technology are mostly high parameters and large capacity, and it is impossible to utilize this part of the relatively scattered but huge total amount of low-temperature waste heat energy.

The ORC (Organic Working Fluid Rankine Cycle) low-temperature waste heat power generation system can achieve the minimum waste heat resource temperature of waste heat recovery and power generation as low as 80℃, which is not possible with conventional power generation technology (conventional power generation usually requires the heat source temperature to be above 300~350℃), thereby greatly broadening the scope of utilization of waste heat resources that can be recovered for power generation, and providing effective technical means and equipment for the recovery of low-temperature waste heat resources in industries such as steel, chemical industry, nonferrous metallurgy, cement, etc.

2. ORC organic Rankine cycle power generation system

ORC organic working fluid Rankine cycle, that is, using organic working fluid to replace water in the traditional Rankine cycle to generate steam and drive the expander to do work.

Low-pressure liquid organic working fluid has a lower condensation temperature, such as n-butane, isobutane, R245fa, R142b, etc., which can produce higher pressure steam at a lower temperature. The waste heat temperature is 80~250℃, and the waste heat forms include flue gas, steam and hot water.

After being pressurized by the organic working fluid pump, the liquid organic working fluid enters the evaporator to absorb heat and transform into high-temperature and high-pressure steam; the high-temperature and high-pressure organic working fluid steam then drives the turbine to do work, generates electrical energy output, and the organic working fluid steam is reduced in pressure at the same time; the low-pressure steam at the turbine outlet enters the condenser, releases heat to the low-temperature heat source and condenses into liquid, completing a cycle.

The evaporator can use low-temperature waste heat to evaporate directly, or use the intermediate hot water (about 150℃) generated by it to evaporate the organic working fluid.

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