Heat Recovery: Fuel Savings by Preheating Combustion Air

As a result of high and rising costs of fossil fuels and fossil fuels affect global environment concern , and by the reduction of greenhouse effect gases from burning causes (Kyoto Protocol), the heat recovery gain importance growing. A heat exchanger absorbs a significant portion of the heat energy of the gases generated during combustion of solid fuel, liquid and gas in the smelting process, heating, roasting, and drying.

Of a certain product, the absorbed heat energy is transmitted to other fluid, most of the time the internal combustion air for the process itself, and fuel economy is so considerable that the recuperator is amortized in a few months, besides getting a drastic reduction in gas emissions gases.

You can install heat recovery on all channels of exhaust fumes from a production process where necessary combustion air, the most classic of the following:
1) enamel industry (in frit melting furnaces),
2) industry the glass (melting furnaces, either from land, cut glass or mixed),
3) steel industry (reheating furnaces, forging furnaces, ovens treatment, etc.).

There is another type of plants in which not only interesting, but sometimes necessary, attach a recuperator, such as thermal oxidation of solid, liquid or gaseous, metal melting furnaces, kilns, boilers production Steam and thermal oil, etc.

The limit of application of recuperators is normally Kalfrisa entry temperatures of smoke up to 1,500 ° C. The maximum temperatures reached hot air, working continuously, are about 800 ° C, and although in some cases are limited by the type of fuel used in the process.

Making Kalfrisa in this field covers the salvage of radiation (tube and jacket), the convection recuperators and the combination of both.

The possibility of a design for each specific process according to the needs, makes it possible to achieve recovery of energy savings in many cases very important, either in new facilities or in a retrieval system installed and optimized with new areas of trade or replaced by more effective.

The five parameters that influence the design of a recuperator:
1. The composition of smoke and dust content.
2. Smoke temperature at the inlet of recuperator and temperature you want to heat the air.
3. Smoke and air flow rates that will pass through the recuperator.
4. Working pressure of the installation.
5. Place where you want to install the recuperator.