How to Calculate the Energy Savings from RTO with Heat Recovery?

Regenerative Thermal Oxidizers (RTOs) with Heat Recovery are widely used in various industries to control air pollution by destroying organic pollutants. However, one of the significant advantages of RTOs is that they can recover a significant amount of energy that can be utilized in various processes. In this article, we will discuss how to calculate the energy savings from RTOs with heat recovery.

Understanding RTO with Heat Recovery

• Definition of RTO with Heat Recovery
• How does RTO with Heat Recovery work?
• Components of RTO with Heat Recovery

An RTO with heat recovery is an air pollution control system that oxidizes organic pollutants in the exhaust air stream. The system consists of two or three ceramic beds filled with heat exchange media. The media helps to recover heat from the exhaust gases and transfer it to the incoming process air stream. The recovered heat can be utilized in various processes such as preheating incoming process air or water.

Calculating the Heat Recovery Efficiency

• Definition of Heat Recovery Efficiency
• Factors affecting Heat Recovery Efficiency
• Methods to calculate Heat Recovery Efficiency

The heat recovery efficiency of an RTO with heat recovery is the ratio of the heat energy recovered to the heat energy available in the exhaust gases. The factors that affect the heat recovery efficiency include the inlet and outlet temperatures, the flow rate of exhaust gases and incoming process air, and the specific heat capacity of the gases and air.

The heat recovery efficiency can be calculated using various methods such as the enthalpy method, the temperature method, and the effectiveness method. The choice of the method depends on the available data and the accuracy required.

Calculating the Energy Savings

• Definition of Energy Savings
• Factors affecting Energy Savings
• Methods to calculate Energy Savings

The energy savings from an RTO with heat recovery is the difference between the energy consumed by the RTO and the energy recovered by the heat exchanger. The factors that affect the energy savings include the inlet and outlet temperatures, the flow rate of exhaust gases and incoming process air, and the specific heat capacity of the gases and air.

The energy savings can be calculated using the heat recovery efficiency and the heat energy available in the exhaust gases. The calculation can be done using the following formula:

Energy Savings = (Heat Energy Available – Energy Consumed) x Heat Recovery Efficiency

Case Study: Energy Savings from an RTO with Heat Recovery

• Overview of the Case Study
• Data Collection
• Calculations
• Results and Analysis

Let us consider a case study where an RTO with heat recovery is installed in a manufacturing plant. The RTO consumes 500 kW of energy, and the exhaust gases have a flow rate of 10,000 Nm³/hr and an inlet temperature of 300°C. The incoming process air has a flow rate of 5,000 Nm³/hr and an inlet temperature of 25°C. The specific heat capacity of the gases and air is 0.24 kJ/Nm³°C and 1.005 kJ/Nm³°C, respectively.

Using the enthalpy method, we can calculate the heat recovery efficiency as 84%. The heat energy available in the exhaust gases is 2,232,000 kJ/hr. Hence, the energy savings from the RTO with heat recovery is:

Energy Savings = (2,232,000 – 500,000) x 0.84 = 1,455,600 kJ/hr

This energy can be utilized in various processes such as preheating incoming air, saving energy costs, and reducing greenhouse gas emissions.

結論

RTOs with heat recovery are an efficient way of controlling air pollution and recovering energy. Calculating the energy savings from RTOs with heat recovery is essential in determining the system’s efficiency and the potential cost savings. The calculation involves understanding the system’s components, calculating the heat recovery efficiency, and then calculating the energy savings. By understanding the calculation methods, one can optimize the RTO with heat recovery’s performance and enhance its benefits.

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