What is Boilers Economizer

Boiler economizer is a heat exchanger installed on the flue gas stack of a boiler. Its primary function is to capture and utilize heat from the flue gases that would otherwise be wasted. This process enhances the overall energy efficiency of the boiler system.

The economizer operates by transferring heat from the hot flue gases to the incoming feedwater. This preheats the feedwater, reducing the energy required to bring the water to the desired temperature within the boiler.

 

Boiler Economiser Definition 

A boiler economizer is a heat exchanger that is installed on the stack of a boiler. It is designed to recover heat that would otherwise be wasted. The economizer transfers heat from the flue gases to the boiler feedwater, which helps to preheat the water before it enters the boiler. This reduces the amount of fuel that is needed to heat the water, which can save energy and money.

Economizers can be either condensing or non-condensing. Condensing economizers are more efficient than non-condensing economizers, but they require the flue gases to be cooled below their condensation temperature. This can be a problem in some applications, such as when the boiler is burning fuel oil that contains sulfur.

Economizers can be very effective at saving energy. In some cases, they can reduce fuel consumption by up to 20%. This can lead to significant savings on energy costs. Economizers can also help to reduce emissions, as they reduce the amount of fuel that needs to be burned.

Economizers are a relatively simple and inexpensive addition to a boiler system. They can be a cost-effective way to save energy and improve environmental performance.

Benefits of installing a boiler economizer

• Reduced fuel consumption: Economizers can reduce fuel consumption by up to 20%, which can lead to significant savings on energy costs.
• Reduced emissions: Economizers help to reduce emissions by reducing the amount of fuel that needs to be burned.
• Improved boiler efficiency: Economizers can improve boiler efficiency by up to 10%.
• Increased system life: Economizers can help to extend the life of a boiler by reducing the amount of wear and tear on the boiler components.
• Reduced maintenance costs: Economizers require very little maintenance, which can save money in the long run.

If you are looking for a way to save energy and improve the efficiency of your boiler system, a boiler economizer is a great option. Boiler economizers are a proven way to save money and reduce emissions.

sometimes called Economizer ) is the Energy improving device that helps to reduce the cost of operation by saving fuel.

The economizer in Boiler tends to make the system more energy efficient.

In boilers, economizers are generally Heat Exchangers which are designed to exchange heat with the fluid, generally water.

HOW DO BOILER ECONOMIZERS WORK?

Boiler economizers work by transferring heat from the flue gases to the boiler feedwater. The flue gases are typically hot, around 300-500 degrees Fahrenheit, and the boiler feedwater is typically cold, around 100-150 degrees Fahrenheit. The heat from the flue gases is transferred to the boiler feedwater, which raises the water’s temperature. The heated water is then used to make steam or hot water.

There are two main types of boiler economizers: condensing and non-condensing.

• Condensing economizers: Condensing economizers are the most efficient type of economizer. They work by cooling the flue gases below their condensation temperature, which allows the water vapor in the flue gases to condense and release its latent heat. This latent heat is then transferred to the boiler feedwater.
• Non-condensing economizers: Non-condensing economizers do not cool the flue gases below their condensation temperature. They are less efficient than condensing economizers, but they are also less expensive.

The most common type of boiler economizer is the shell-and-tube economizer. This type of economizer is made up of a shell and a series of tubes. The flue gases flow through the shell, and the boiler feedwater flows through the tubes. The heat from the flue gases is transferred to the boiler feedwater through the tubes.

Plate economizers are also a common type of boiler economizer. This type of economizer is made up of a series of plates that are arranged in a parallel or staggered pattern. The flue gases flow through the plates, and the boiler feedwater flows between the plates. The heat from the flue gases is transferred to the boiler feedwater through the plates.

Boiler economizers can be installed on new boilers or retrofitted to existing boilers. The cost of installing a boiler economizer can vary depending on the size and type of boiler. However, the savings on fuel costs can typically offset the cost of the economizer within a few years.

Here are some of the factors that affect the efficiency of a boiler economizer:

• The temperature of the flue gases
• The temperature of the boiler feedwater
• The type of economizer
• The size of the economizer
• The installation of the economizer

Boiler Economiser and Waste Heat Recovery Concept

Boilers are generally designed to produce steam from water. Water is converted to steam by transferring both sensible and latent heat.

Sensible heat is the amount of heat required to increase the temperature of water at constant pressure without changing its liquid state, while Latent heat is the amount of heat required to change the state from Liquid to Vapor at constant temperature and pressure.

The exhaust from the boilers is generally in the temperature range of 200°C – 250°C, so there are a huge amount of losses from the boiler if any heat recovery devices are not installed after it.

If the exhaust gases which are leaving the Boiler at such high temperature is made to pass through the Economiser in order to provide the required sensible heat to the water by increasing its temperature, it will reduce the heat load on the boiler to the greater extent.

We at Thermodyne Engineering Systems manufacture Boiler Economiser that suits your boiler system and will increase its overall efficiency from 3% – 5%.

An increase in boiler efficiency will save a lot of your operating costs and eventually will prolong the life of your boiler system.

Also Read: Air Pollution Control Equipment

The function of the Boiler Economizer

The Economizer in Boiler works on the principle of Heat Transfer. Heat transfer usually takes place from high temperature to low temperature.

In the case of Boilers, flue gases or exhaust from the boiler outlet are at high temperature and water that needs to be preheated is at low temperature.

So, this temperature difference between water and flue gases helps to increase the feed water temperature.

Depending on the type of operations, the design of Economisers can be smoke tube type or water tube type.

In the smoke tube type, flue gases are inside the tubes and water is on the shell side while in the water tube type, water is in the tube and flue gases are on the shell side.

Also Read: Coil Type Steam Boiler

Types of Economiser in Boiler

Boiler Economisers can be classified in various ways depending on the economizer’s function and operation.

An economizer can be made pressurized or non-pressurized depending on the required water temperature through it.

Thermodyne manufactures both Pressurized Economisers as well as non-pressurized Economisers to suit your needs.

Generally, If the required water temperature is above the normal boiling point at atmospheric pressure, then the Boiler Economisers are needed to be pressurized and if they are below the boiling point they can be made non-pressurized.

Thermodyne boilers have a lot of experience in manufacturing Economisers and is tailor-made in order to suit your specific requirements.

Also Read: High-Pressurized Boiler

Also Read: Boiler Economiser Definition

The compact design Thermodyne Boiler Economiser further reduces the flue gas losses and will save you a good fortune in terms of fuel usage thereby lowering the operating cost.

Contact us for more details related to Thermodyne Boiler Economisers – Talk to Thermodyne Boilers Sales Team

Boiler Economiser FAQs

Boiler Resources Page Link

• Boiler Losses That Eat Away Your Profits
• Dissolved Gases in Feed Water and Its Effect
• Pressure Reduction System
• How to Minimize the Blowdown Losses
• Why Thermodyne Boiler