New ideas for energy savings – Creative approaches to \"Power generation through the recovery of low-pressure steam and hot water\"
Thread Content
This post was last edited by Yu Re Yu Ya Fa Dian on 2017-8-11 at 16:10. Petrochemical enterprises generate large amounts of low-pressure steam and hot water that are either wasted or condensed; using these resources for power generation can help reduce energy consumption and emissions, while also generating profits and saving costs. For 75°C hot water at a flow rate of 100 t/h, 104 kW of net power can be generated per hour; for 90°C hot water at the same flow rate, 180 kW of net power can be generated per hour, and for 100°C hot water at 100 t/h, 256 kW of net power can be generated per hour. At an absolute pressure of 0.1 MPa and a flow rate of 3 t/h, 142 kW of net power can be generated per hour from thermal energy alone, while at an absolute pressure of 0.7 MPa and the same flow rate, 279 kW of net power can be generated per hour by utilizing both thermal energy and pressure energy.
Excuse me, are there any application instances? If there are any, sending a few pictures would make this post perfect. :lol
This post was last edited by Yu Re Yu Ya Fa Dian by 16:10 on 2017-8-11. There are certainly many applications for these systems; we only started large-scale production in the past one or two years. Last year, the sales revenue from the utilization of waste heat and pressure exceeded 100 million yuan. These are diagrams showing the appearance of ORC screw expansion generators that utilize direct steam expansion as well as the recovery of low-pressure steam and hot water. We welcome everyone to cooperate with us to create economic benefits through energy conservation and emission reduction.
There are a few questions I don’t understand: 1. What is the typical temperature of hot water required for waste heat power generation? 2. What is the temperature of the water discharged after electricity generation (is it related to the atmospheric temperature? Assume the temperature is 20 degrees)? 3. What is the level of investment required? For example, for a hot water power generation plant with a capacity of 500 t/h @ waste heat and pressure recovery power generation
For waste heat power generation, a water temperature of around 75 degrees Celsius or higher is generally suitable; the higher the temperature, the more electricity can be generated per ton of water； The outlet water temperature after power generation is determined based on the user’s process requirements; if no such requirements exist, standard practices are followed. The outlet water temperature is related to the condensation temperature (the temperature of the cooling water). For example, in some cases, we reduce the temperature from 95 degrees to between 50 and 60 degrees to meet the process requirements regarding the temperature of the hot water. By using generator sets in place of the conventional plate heat exchangers that rely on electricity to cool the hot water or solutions, heat energy can also be recovered for power generation, thereby achieving dual economic benefits and significantly reducing costs ； Investment is determined based on the installed capacity of the unit, and it is related to the amount of electricity generated. For a hot water system with a capacity of 500 t/h, it is necessary to know the temperature in order to determine the amount of electricity that can be generated. If the required temperature for electricity generation can be achieved, the benefits are quite significant. If the electricity price is reasonable, it is generally possible to recover the investment within a little over two years, or at most three years.
1. What is the power generation efficiency of this technology? 2. Is the failure rate high? 3. Is the skid block merely used as a backup for the original plant’s process flow? In that case, the equipment investment for the original device will not be saved.