Economizer fin tube Serpentine Coil for boiler Industry power plants saving fuel

Advantages and Benefits of Serpentine Coil Economizer

1. It recovers more heat of flue gases which normal air pre-heater cannot do.
2. Due increase in fuel prices, all power plants are facing pressure for increasing boiler efficiency. So by using economizer, this pressure can be minimized.
3. Power plants where it is not used, a large quantity of water is required to cool the flue gas before desulphurization which is minimized by using economizers.
4. The efficiency of the power plant reduced when steam air pre-heater required steam.

Serpentine Tube Economizer Application

1. It is used in all modern plants. The use of economizer results in saving fuel consumption increases steaming rate and boiler efficiency.

Some of the common applications of economizer are given below, In steam power plants it captures the waste heat from boiler stack gases (flue gases) and transfers it to the boiler feed water.

2. Air-side economizers HVAC (Heating, Ventilation, and Air Condition) can save energy in buildings by using cool outside air as a means of cooling the indoor space.

3. Refrigeration: This is commonly used in industrial refrigeration where vapor compression refrigeration is essential. Systems with economizers aim to produce part of the refrigeration work at high pressures, a condition in which gas compressors are normally more efficient.

Boiler Economizer Introduction

1. In a steam boiler, it is a heat exchanger device that heats up fluids or recovers residual heat from the combustion product i.e. flue gases in a thermal power plant before being released through the chimney.

2. Flue gases are the combustion exhaust gases produced at power plants consist of mostly nitrogen, carbon dioxide, water vapor, soot carbon monoxide etc.

3. Hence, the economizer in thermal power plants is used to economize the process of electrical power generation, as the name of the device is suggestive of. The recovered heat is in turn used to preheat the boiler feed water, that will eventually be converted to super-heated steam.

4. Thus, saving on fuel consumption and economizing the process to a large extent, as we are essentially gathering the waste heat and applying it to, where it is required. Nowadays, however, in addition to that, the heat available in the exhaust flue gases can be economically recovered using Air Preheater which is essential in all pulverized coal-fired boiler.

The function of Boiler Economiser

1. 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.

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

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

4. In 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.

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