Economizer - Wikipedia

The first successful economizer design was used to increase the steam-raising efficiency of the boilers of stationary steam engines.It was patented by Edward Green in 1845, and since then has been known as Green's economiser.It consisted of an array of vertical cast iron tubes connected to a tank of water above and below, between which the boiler's exhaust gases passed.

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Common Maintenance Issues for Economizer

The economizer helps to improve the efficiency of the boiler. It helps to lower the temperature of the flue gas. Adding an economizer can improve boiler efficiency by 3-5%. Increasing the boiler efficiency can help reduce operating costs of the boiler by reducing fuel costs. The economizer helps you to get a faster return on investment.

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Condensing Economizer - Kemco Systems

The dollars saved on fuel in just one year may be enough to pay for the cost of the system. This rapid return on investment exceeds that of other conventional economizer types of equipment on the market today. Traditional finned-tube units cannot reduce boiler stack temperature below 280°F without self destructing from cold end corrosion.

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Typical damages to Boilers & Economizers

In economizers the heating surfaces shall be kept as clean as possible (no soot –no noticeable corrosion) Circulation water temperature to be > 130°C – preferably min 140°C. (for the typical evaporating economizer after engine, the water is circulated on oil fired boiler and temp. above 160°C)

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boiler stack economizer calculator

Oct 14, 2021 · How to Calculate Boiler Economizer Efficiency. The installation of a boiler economizer helps to solve this problem. An economizer is a unit that captures heat from the stack, and then returns it to a water system. To determine if a boiler economizer is right for your facility, look at your annual boiler fuel bill and subtract 5 to 10% of the cost.

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Use Feedwater Economizers for Waste Heat Recovery

annual energy savings that will be achieved by installing an economizer given 8,400 hours per year (hr/yr) of boiler operation at a fuel cost of $8.00 per million Btu ($8.00/MMBtu). From the steam tables, the following enthalpy values are available: For 150-psig saturated steam: 1,195.5 Btu/lb For 117 °F feedwater: 84.97 Btu/lb

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Maximize Boiler Heat Recovery with Condensing Economizers

•Menex system installed on two 75,000 pph 800 psig saturated steam boilers • Steam Production – 95,000 pph summer – 130,000 pph winter • Installed after existing FW economizer • Preheat boiler make-up water to 135 F • Installed cost: $600,000 • Annual savings: $400,000 • Payback: 1.5 yrs Case Study: Direct Contact Condensing economizer Dial Corporation, Chicago area

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The Importance and Use of Boiler Economizer in Industrial

Jul 12, 2021 · Generally, the flue gas temperature of high-pressure steam boilers ranges from 400 degrees F to 650 degrees F. This high-temperature exhaust results in energy wastage. Economizers, therefore, help in reducing such heat loss and energy input in the steam boiler. Types of Economizers: There are 2 types of Boiler Economizers used in steam boilers.

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Steam Boiler: Deaerator-Economizer as Feedwater Heater in

Economizer operation costs are determined by fan power and pump power. Fan used to flow combustion air to the boiler through the economizer. The more loops and more complex arrangement of economizer tubing on the fan power required increases. Pumps used to drain the boiler feedwater to the steam drum through the economizer. The longer and more

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Benchmark the Fuel Cost of Steam Generation

Benchmark the Fuel Cost of Steam Generation Benchmarking the fuel cost of steam generation ($/1000 lbs of steam) is an effective way to assess the efficiency of your steam system. This cost is dependent upon fuel type, unit fuel cost, boiler efficiency, feedwater temperature, and steam pressure. This calculation provides a good first

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(PDF) Condensing economizers for large scale steam …

Our broad line of economizers covers the spectrum of boiler sizes, ranging from very small hot water boilers with burner inputs of 200,000 BTU/hr to large boilers delivering steam at 250,000 lb/hr. In addition, Cain produces boiler feedwater systems, condensate tank and pump systems, exclusive sootblower assemblies, and unique modulating

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Boiler Basics 101: Economizers for Increased Efficiency

Nov 27, 2019 · Overall, an economizer can be a major cost savings for boiler owners and will easily provide a quick return on investment. The economizers' simple technology and static parts provide longevity and low maintenance, and they are available in multiple designs and configurations.

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Energy, cost and emission-saving solutions for shell steam

Fuel cost savings of up to 7 % can be realised at full load. 1 Make-up water 2 Flue gas condenser 3 Water service module 4 Steam boiler 5 Economizer 6 Condensate neutralisation 7 Chimney 8 To the blow-down expansion module Extremely simplified diagram Figure 2: Block diagram of a high-pressure steam boiler system with two flue gas heat

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Effect of Economizer on Efficiency of the Fire Tube Steam

Aug 08, 2018 · The effects of using economizer on efficiency of examined fire tube steam boiler is presented.Based on the live tests, the performance indexes of two fire tube 3 passes wet back steam boilers with capacity of 3000 kg/h (one of them with economizer and another without economizer) measured. The results show the effect of using economizer for increase the feed water temperature …

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Thermal Design of Economizer for Waste Heat Recovery Boiler

P.Ravindra Kumar[3] One of the most cost effective ways of improving the efficiency of a high pressure steam boiler is to install an economizer on the boiler. Typically, on a high pressure water tube boiler, the efficiency improvement with an economizer is 2 to 4%, depending on firing rate. On a

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Maximize Boiler Heat Recovery with Condensing Economizers

Given 8,000 hours per year of boiler operation, and a fuel cost of $8.00/ MMBtu, the annual energy recovered is valued at: Annual Savings = 7.55 MMBtu/hr x 8,000 hrs/ yr x $8.00/MMBtu/0.83 = $582,170 Table 2. Exhaust Gas Energy Available from a 100,000 lb/hr Natural Gas-Fired Steam Boiler (MMBtu/hr) Flue Gas Temperature Leaving Condensing Economizer

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Energy Tips – Steam

of 300°F after feedwater economizer, a blowdown rate of 4%, and a boiler feedwater temperature of 260°F. Makeup water temperature is 55°F. Assume that an indirect contact condensing economizer is retrofitted onto this 100,000 lb/hour steam boiler to heat 50% of the make-up water from 55°F to 200°F and flue gases are cooled to 100°F.

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Boiler Economizer Systems

Exhaust gas temp after economizer: 295º F Btu transferred into boiler feedwater: 2954 MBtu/hr Capital cost: $31,662 Annual savings: $65,592/year Simple payback: 5.8 months Installation cost not included in example "Manufacturing Waste Heat Transfer Products to Save Energy" .cainind.com Case Study #2 Location: Dow Corning Corp., Midland, MI Boiler: 2500 HP Steam Boiler

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Typical damages to Boilers & Economizers

In economizers the heating surfaces shall be kept as clean as possible (no soot –no noticeable corrosion) Circulation water temperature to be > 130°C – preferably min 140°C. (for the typical evaporating economizer after engine, the water is circulated on oil fired boiler and temp. above 160°C)

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Steam Tip 26: Consider Installing a Condensing Economizer

Assume that an indirect contact condensing economizer is retrofitted onto this 100,000 lb/hr steam boiler to heat 50% of the makeup water from 55°F to 200°F and flue gases are cooled to 100°F. At these conditions, 12.75MMBtu/hr of total energy is available in the exhaust, of which 7.55 MMBtu/hr will be recovered to heat makeup water in the

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03 Related Costs Of Economizers In Steam Boilers information