How is economizer efficiency calculated?

155STEAM BOILER, ECONOMIZER, AND AIR-HEATER EFFICIENCY The economizer efficiency = (heat absorbed, Btu/h)/(heat available, Btu/h) = 4,283,000/8,770,000 = 0.488, or 48.8 percent.

How do you calculate heat energy from waste?

1. S = Cross sectional area (m2) of waste flow pipe/ducting. V = Flow velocity (m/sec) ρ = Media density (kg/m3)
2. Q = Waste energy flow rate (kW/hour) Value = monetary value per hour of the waste heat stream.
3. Unit cost = m’Currency’ per kW. fuel cost = cost for fuel used in currency per kW.

What is a heat recovery boiler?

Waste Heat Recovery Boiler is a system which recovers various kinds of waste heat generated from the production process of steel, non-ferrous metal, chemical, cement etc and those equipment of industrial furnaces, refuse incinerators, industrial waste incinerators, and convert such recovered heat into useful and …

How much efficiency does a boiler lose?

For a modern boiler with 94% efficiency, 94% of the energy used by the boiler goes to heating the home, only 6% is ‘lost’/used to run itself. For a very old boiler with 60% efficiency, only 60% of the energy used by the boiler goes to heating the home, a whopping 40% is lost.

How does a boiler superheater work?

In a steam engine, the superheater re-heats the steam generated by the boiler, increasing its thermal energy and decreasing the likelihood that it will condense inside the engine. Superheaters increase the thermal efficiency of the steam engine, and have been widely adopted.

What are the two types of economizers?

There are 2 types of economizers: non-condensing and condensing.

What factors affect boiler efficiency?

5 Factors Affecting Industrial Boiler Efficiency

• Flue Gas Temperature. Flue gas temperature, also known as “stack temperature,” measures how hot the combustion gases are as they exit the boiler.
• Fuel Specification.
• Excess Air.
• Ambient Temperature.
• Radiation and Convection Losses.

What are the main factors causing reduced boiler efficiency?

The three main factors in determining efficiency are therefore flue-gas exit temperature, excess air and burnout, all of which are dependent on the technology. The flue-gas exit temperature is related to boiler design rather than the combustor.

What is the difference between waste heat recovery boiler and WHRB?

Waste Heat Recovery Boilers (aka WHRB) are a unique designed to heat recovery from waste flue gases from Furnace, DG, Kiln exhaust. A waste heat recovery unit (WHRU) is an energy recovery heat exchanger that transfers heat from process outputs at high temperature to another part of the process for some purpose, usually increased efficiency.

How do you calculate thermal efficiency of a waste heat boiler?

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.

What does WHRB stand for?

Forbes Marshall Waste Heat Recovery Boilers (WHRB) Forbes Marshall – Trusted Partners in Steam Engineering & Control Instrumentation Waste Heat Recovery Boilers (WHRB) Toggle navigation Solutions Boilers Boiler Efficiency Steam Systems SWAS Process Analytics Flow & Level Vibration Monitoring Control Systems Gauges Emission Monitoring

How do you test the efficiency of a boiler?

Basically Boiler efficiency can be tested by the following methods: 1) The Direct Method:Where the energy gain of the working fluid (water and steam) is compared with the energy content of the boiler fuel. 2) The Indirect Method:Where the efficiency is the difference between the losses and the energy input.