Oxygen-enriched combustion radiant tube heaters

Abstract

A radiant-tube heater of oxygen-enriched combustion belonging to the field of environmental protection relates to a new method of oxygen-enriched combustion technology applicable to radiant-tube heater, to develop a combustion system of novel industrial radiant tube that combusts the low-calorific value gas (or other fuel gas) to increase the heat utilization, which is characterized in that the heater comprises oxygen or oxygen-enriched air (1), fuel (2), mixed gas (3) of oxygen or oxygen-enriched air and smoke gas, fuel gas (4), smoke gas (5) in the radiant tube, smoke gas (6) discharged from the radiant tube, a smoke gas injector (7), a combustor (8), a boiler wall (9) and a radiant tube (10). The heater has low combusting temperature, low content of harmful gas like NOx in the smoke gas and high heat efficiency, and is good for collecting the smoke, in particular to CO2 and increases the stability and reliability of the system.

Description

technical field

[0001] The invention belongs to the field of environmental protection, and relates to a new method for applying oxygen-enriched combustion technology to a radiant tube heater. Industrial radiant tube combustion system. Background technique

[0002] At present, heating equipment such as metal heat treatment that requires the use of protective gas mostly uses radiant heaters, especially gas-fired radiant tubes are widely used in strip continuous annealing furnaces. In order to improve the thermal efficiency of the radiant tube, people developed the regenerative radiant tube in the late 1980s, which greatly improved the thermal efficiency. However, since the heat storage body needs regular maintenance and replacement, and the heat storage body also has thermal efficiency problems in the process of heat exchange, it is not the best for the recovery of waste heat from flue gas. Contents of the invention

[0003] The purpose of the present invention is to const...

Examples

Embodiment Construction

[0013] 1. The ejector is located in the outer radiant tube system structure of the furnace wall. It consists of oxygen or oxygen-enriched air 1, fuel 2, a mixture of oxygen or oxygen-enriched air and combustion flue gas 3, combustion gas 4, flue gas in the radiant tube 5, The flue gas 6 discharged from the radiant tube, the flue gas ejector 7, the burner 8, the furnace wall 9, and the radiant tube 10 are composed. The ejector is located on the outside of the furnace wall. Although it is easy to install, it has certain radiation and convective heat transfer to the environment, which is not good for the environment outside the furnace.

[0014] 2. The ejector is located in the inner radiant tube system structure of the furnace wall, which consists of oxygen or oxygen-enriched air 1, fuel 2, mixed gas 3 of oxygen or oxygen-enriched air and combustion flue gas, combustion gas 4, flue gas in the radiant tube 5, The flue gas 6 discharged from the radiant tube, the flue gas ejector 7...

technical field

[0001] The invention belongs to the field of environmental protection, and relates to a new method for applying oxygen-enriched combustion technology to a radiant tube heater. Industrial radiant tube combustion system. Background technique

[0002] At present, heating equipment such as metal heat treatment that requires the use of protective gas mostly uses radiant heaters, especially gas-fired radiant tubes are widely used in strip continuous annealing furnaces. In order to improve the thermal efficiency of the radiant tube, people developed the regenerative radiant tube in the late 1980s, which greatly improved the thermal efficiency. However, since the heat storage body needs regular maintenance and replacement, and the heat storage body also has thermal efficiency problems in the process of heat exchange, it is not the best for the recovery of waste heat from flue gas. Contents of the invention

[0003] The purpose of the present invention is to const...

Examples

Embodiment Construction

[0013] 1. The ejector is located in the outer radiant tube system structure of the furnace wall. It consists of oxygen or oxygen-enriched air 1, fuel 2, a mixture of oxygen or oxygen-enriched air and combustion flue gas 3, combustion gas 4, flue gas in the radiant tube 5, The flue gas 6 discharged from the radiant tube, the flue gas ejector 7, the burner 8, the furnace wall 9, and the radiant tube 10 are composed. The ejector is located on the outside of the furnace wall. Although it is easy to install, it has certain radiation and convective heat transfer to the environment, which is not good for the environment outside the furnace.

[0014] 2. The ejector is located in the inner radiant tube system structure of the furnace wall, which consists of oxygen or oxygen-enriched air 1, fuel 2, mixed gas 3 of oxygen or oxygen-enriched air and combustion flue gas, combustion gas 4, flue gas in the radiant tube 5, The flue gas 6 discharged from the radiant tube, the flue gas ejector 7...

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