What is meant by waste heat recovery?
Waste heat recovery is the use of surplus heat that has been produced, for example from a gas turbine on an offshore platform. Waste heat recovery systems are available to improve the overall efficiency of energy use by recovering heat from combustion gases in a steam boiler.
What is the purpose of waste heat recovery system?
Waste heat recovery systems. Waste heat recovery methods include capturing and transferring the waste heat from a process with a gas or liquid back to the system as an extra energy source [5]. The energy source can be used to create additional heat or to generate electrical and mechanical power [6].
How is WHR boiler efficiency calculated?
In general, we take this formula to calculate waste heat boiler thermal efficiency. η= 100-(q2+q3+q4+q5+q6), which include the Q2 flue gas losses, Q3 gas incomplete combustion losses, Q4 solid incomplete combustion losses, Q5 heat radiation losses and Q6 slag ash physical losses.
How is waste heat measured?
- S = Cross sectional area (m2) of waste flow pipe/ducting. V = Flow velocity (m/sec) ρ = Media density (kg/m3)
- Q = Waste energy flow rate (kW/hour) Value = monetary value per hour of the waste heat stream.
- Unit cost = m’Currency’ per kW. fuel cost = cost for fuel used in currency per kW.
What are the benefits or the advantages of waste heat recovery units WHRU )?
Reduced Pollution: Thermal and air pollution will dramatically decrease since less flue gases of high temperature are emitted from the plant since most of the energy is recycled. Reduced equipment sizes: As Fuel consumption reduces so the control and security equipment for handling the fuel decreases.
What is the meaning of waste heat?
Definition of waste heat : heat rejected or escaping from furnaces of various types (as coke ovens, cement kilns, or steel furnaces) after it has served its primary purpose.
How can waste heat be recovered?
Process to Process: The heat pipe heat exchangers recover waste thermal energy from the process exhaust and transfer this energy to the incoming process air. The incoming air thus become warm and can be used for the same process/other processes and reduces process energy consumption.
What are the major advantage of waste heat recovery in industry?
The technology used in a waste heat recovery system enables companies to reduce waste and increase their efficiency. On a plant level, implementing this system can reduce your plant’s energy consumption by a lot. Every unit of captured waste heat directly replaces each unit of purchased energy.
What does a waste heat boiler do?
Waste heat boilers utilise the heat in flue gases from combustion processes or hot waste air flows from industrial processes to generate hot water or saturated steam.
What is a heat recovery unit (WHRU)?
Waste Heat Recovery Units (WHRU) recover heat from Gas Turbines or Diesel Engines by heating up a liquid heating medium. The equipment is widely used on offshore oil and gas installations to cover the various heat demand in the process. Techouse is a world leading supplier of WHRUs for the offshore industry.
What is a WHRU and how does it work?
A WHRU is normally assembled to a single lift unit that contains all elements needed to control the heat recovery: In most of the units the by-pass and the main stack are merged after the heat recovery section. Normally, the full exhaust stacks are included in the WHRU supply.
How does the gas turbine exhaust enter the WHRU?
The gas turbine exhaust enters the (WHRU) through a single blade diverter valve or a multi blade louver valve, where the exhaust gas is directed to the tube bundle, to the bypass duct or a combination of both. The tube bundle consists of several parallel tube circuits.