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Tubular heating furnace
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Tubular heating furnace
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The tubular heating furnace is generally composed of five parts: a radiation chamber, a convection chamber, a waste heat recovery system, a burner, and a ventilation system. Its structure usually includes: steel structure, furnace tube, furnace wall (lining), baffle, quick opening damper, hole type accessories, etc.
Heating furnace component modules and accessories
1. Radiation section module
High temperature flame and high temperature flue gas are emitted from the burner, and the high temperature flame transmits heat to the furnace tube in the radiation chamber through radiation, thereby transferring it to the medium inside the furnace tube.
2. Convection chamber module
High temperature flue gas enters the convection chamber of the heating furnace and transfers heat to the furnace tubes in the convection chamber through convection, which in turn transfers heat to the media inside the furnace tubes
3. Waste heat recovery system
The waste heat recovery system is used to recover the exhaust heat from the heating furnace. Air preheater is used to recover residual heat from the air preheater to return the recovered heat to the furnace, which is called air preheating method.
Air preheaters include fixed tubular air preheaters installed directly above the convection chamber, and tubular air preheaters placed separately on the ground. After installing a waste heat recovery system, energy conservation and emission reduction can be better achieved, and the total efficiency of the furnace can reach 88% - 90%.
空气预热器模块
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Technical characteristics of heat pipes Main performance indicators of high-efficiency heat pipe Axial heat density λ d≥28MW/m ² Equivalent thermal conductivity λ≥ 14MW/m℃ Total radiation activity α 1.4x10-1Bq/g Radioactivity β 1.7x10-1Bq/g Effective service life Tt ≥ 5 years Operating temperature range: 95-4 |
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Wide application range: It can be used for heat transfer and heat exchange between various media such as gas gas, gas steam, gas liquid, liquid liquid, etc. High heat transfer coefficient: Taking gas gas exchange as an example, its equivalent heat transfer coefficient: "K" can be increased by 5-10 times compared to traditional tubular heat pipes. Low fluid resistance: Both types of exchange media travel outside the pipe, eliminating the need to travel back and forth. The process can be greatly shortened, and the flow direction of the media is consistent with the direction of the heat sink, thereby reducing the flow resistance. |
4. Burner
The function of the burner is to complete the combustion of fuel and provide heat for heat exchange. The burner consists of three parts: fuel nozzle, air distributor, and combustion channel.
The performance of the burner directly affects the combustion quality and the thermal efficiency of the furnace. Achieve low oxygen combustion. To ensure combustion quality and thermal efficiency, it is also necessary to have a reliable fuel supply system and a good air preheating system.
burner
5. Steel structure
The steel structure is the load-bearing skeleton of the tubular furnace. The other components of the tubular furnace are attached to the steel structure, and their basic components are various types of steel, which are welded or bolted to form the skeleton of the tubular furnace. Old tubular furnaces, such as square box furnaces and inclined roof furnaces, have a small proportion of their steel structure in the investment of the entire tubular furnace, while modern tubular furnaces have an increasing proportion of their steel structure investment.
steel structure
6. Furnace tube
The tube of a tubular furnace is the medium through which materials absorb heat. According to the different heating methods, it can be divided into radiation furnace tubes and convection furnace tubes, the former set in the radiation chamber, and the latter set in the convection chamber. To enhance heat transfer, convection tubes often use finned tubes (using gas as fuel) or pin head tubes (using residual oil as fuel), and their installation methods are mostly horizontal. Finned tube and pin head tube are expanded surface tubes that enhance convective heat transfer. The heat transfer capacity of a finned tube or pin head tube is twice that of a smooth tube of the same specification.
furnace tube Finned tube Nail head tube
7. Chimney damper and quick opening damper
Adjusting the opening of the baffle in the chimney can control a certain amount of suction force to ensure the most suitable negative pressure in the furnace. Generally, a negative pressure of - 19.6 to - 39.2 Pa is required in the furnace. When opening the fire door to observe the furnace, the flame will not flutter outward, ensuring safe operation.
In the waste heat recovery system, baffles are used to regulate the flow of flue gas and air to meet the requirements of stabilizing the system. Under operational requirements, it is also possible to switch the preheater out of the air supply system.
Chimney damper and quick opening damper
8. Category
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