Heatec Convectec^™ Convection Heater

Overview

Convectec^™ is the brand name for our all-convection heaters. We designed these heaters to heat materials that are sensitive to overheating due to high film temperatures. The heater avoids high film temperatures by exposing its heating coils only to heat energy borne in convection gases. Thus, the coils are not exposed to radiant energy produced by its burner flame. Accordingly the film temperature of the materials flowing through its coils will not exceed its bulk temperature more than 5 degrees F

These heaters are used extensively by oil and gas producers and are ideal for crude oil processing. They are also suitable for use by producers of petrochemicals, chemicals, food and by others. Outputs range from 2 to 100 million Btu/Hour.

Applications

Textiles & Packaging

Heating and thermal process are indispensable in the production of textiles and packaging. In addition, precise and accurate temperature and control systems are often required for efficiency and safety. Astec has a variety of products and systems well-suited to textile and packaging production.
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Power Generation

Power generation is essential to modern life and industry. The power generation industry depends on heating equipment and systems to meet its demands. Astec serves the power and electricity generation industry with a number of products such as thermal fluid heaters, process heaters, heat economizers, and expansion tanks and pump skids.
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Plastics & Thermoplastics

The plastics industry relies on industrial heaters to mold, melt, mix, and prep plastics. Astec manufactures and installs an extensive range of thermal processing equipment for the production of plastics and thermoplastics.
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Petrochemical

The petrochemical industry is fundamental to our contemporary world. It supplies many of the raw materials that we rely on: plastics, medicines, lubricants, synthetic rubbers, and synthetic fibers. The petrochemical industry relies heavily on various thermal processes and heat-controlled methods to produce its vital materials. Astec components used in the petrochemical industry include heaters, controls, steam generators, and heat recovery systems.
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Paints, Resins & Adhesives

Production of paints, resins, and adhesives involves complex chemical processes that demand sophisticated, reliable thermal processing systems. Astec has a long history of producing trustworthy and efficient thermal systems that can be used in the production of paints, resins, and adhesives.
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Food & Beverage Production

Large-scale, commercial food and beverage production relies on thermal processing techniques to ensure the safety of consumables. Reliable and efficient systems are critical to ensure safe food and beverage production. Astec has extensive experience with supplying systems for large-scale food and beverage production.
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Crude Oil & Natural Gas Processing

Oil refining and gas processing are procedures that turn these complex chemical mixtures into a range of usable fuels. Refining and processing crude oil and natural gas require highly reliable and efficient heating systems and services. Astec produces a number of reliable and efficient components for use in oil refining and gas processing including heaters, tanks, heat recovery systems, and expansion tanks.
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Chemical

Chemical plants convert oil, natural gas, air, water, metals, and minerals into chemical products which are used to manufacture numerous consumer products and play an important part in agriculture, manufacturing, construction, and service industries. The transfer of heat is an essential component of all chemical processes. An efficient heat transfer system is a key to manufacturing many chemicals.
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Agriculture & Fertilizer

Modern agriculture practices utilize thermal processes to accomplish a number of goals. Today's sophisticated systems help ensure both safe and efficient production both in the field or in the production of fertilizers. Astec has a variety of products and systems well-suited to the agriculture industry and fertilizer production.
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Features

Heatec Convectec™ Heater Features

The Convectec heater uses a burner that fires into an insulated combustion chamber. The burner flame extends only a limited distance into the chamber. The hot gases produced by the burner flame travel into the bottom of the heat exchanger housing, in a zone where there are no heat transfer coils. The gases are diverted upwards through the top section of the heat exchanger housing, which contains heat transfer coils (process bundles). The gases pass around the coils and heat the coils by convection.
A portion of the gases exit the heater through the exhaust stack. A set amount of the gases is recirculated back to the combustion chamber where they are mixed with the freshly heated gases being produced by the flame.
Heatec Convectec™ Heater Efficiency

A portion of the flue gases get pulled through recirculation ducting by a recirculation fan. The hot gases get recirculated back to the combustion chamber where they are mixed with freshly heated gases being produced by the flame.
Recirculating the gases more than doubles the efficiency of the heater and significantly reduces the amount of NOx (emissions) that exits the exhaust stack. Thermal efficiencies up to 90% (LHV) can be achieved. The amount of gases recirculated limits the temperature and amount of radiation produced by the burner.