quaternity regenerative burner
release time:2014/2/27 13:47:37browse the number:2156 次

Regenerative combustion technology had began to be applied to the blast-furnace hot blast stove, open hearth furnace, coke oven, glass melting furnace and so on which is large scale and high-temperature industrial furnaces in the mid-19th century. However, it has low heat transmission efficiency which adopted the checker brick as the heat retainer, the size of regenerative chamber is huge, the exchange period is long, and so it is limited on its application in other industrial furnaces. In 1982, Hotwork Development Company of UK developed successfully the first new type regenerative furnace which adopted the ceramic ball as the heat retainer and had outstanding energy-saving effect in cooperation with British Gas research institute. After this furnace came out, other countries one after another developed and adopted this technology, whose application object involves glass melting, aluminum melting, billet heating, boilers & waste incineration and ceramic kilns and other industrial furnaces.

The new-type regenerative furnace adopts the ceramic ball and honeycomb ceramic as the heat retainer, whose specific surface area is as much as 200-1000m2/m3, lager several times to hundreds times than old-fashioned checker brick, so the heat transfer coefficient is greatly improved and the exchange period is significantly shortened. The exchange period of traditional regenerative furnace normally is 20~30minutes, while the exchange period of the new one is only 0.5~3 minutes. In addition, as the continuous improvement of reversing device and control technology, the rate of burning time within the exchange period increases substantially. The regenerative chamber of the new-type regenerative furnace has high heat transfer efficiency and short exchange time, which results in low temperature (below 200℃)of exhaust gas temperature and high preheating temperature(just 100-150℃ lower than the furnace temperature)of pre-heated medium. Therefore, exhaust heat can be recovered maximally, temperature efficiency in the regenerative chamber can reach above 85%, and the heat recovery rate can reach above 80%.

Since the 1990s, the international community has achieved great progress on the research and development of regenerative combustion technology, and combined the energy-saving with environmental protection for upgrading it to “High Temperature Air Combustion” technology (HTAC). Some large steel companies apply the Regenerative Combustion Technology to the large heating furnace of steel rolling, universally achieving the effect of energy-saving by 30% and increasing production by more than 20%. At the same time, the good environmental protection effect is achieved, that emission of CO2 is reduced by 30 percent and content of NOX in exhaust gas is reduced below 50 PPM.

In china, the new regenerative combustion technology is paid more and more attention and the great progress in research and application is also achieved. Since the first regenerative burner heating furnace was put into production at the end of 2000, its great energy-saving effect has led to the rapid development of the HTAC, from the only pursuit of energy-saving at the beginning to the subsequent pursuit of long service life, generated low-NOX and the requirement of stable furnace conditions. In the last fifteen yeas, a large number of technical personnel of China went to Japan, the United States, France and so on to study. They constantly summed up and made better, then formed the HTAC in conformity with China’s situation. With the China’s booming metallurgical industry, the new technology is applied continuously, becomes mature and consummate gradually.

Principle of regenerative combustion technology

As shown in figure: After normal temperature air enters into regenerator 1 from the reversing valve. It is heated by the heat retainer (ceramic ball or honeycomb etc.) while the combustion air passes through the regenerator. The air is heated to near furnace chamber temperature (generally the temperature of air heated is only 100-150℃ lower than it of the furnace chamber) in a very short time. After the high temperature air enters the chamber, it forms poor oxygen high temperature air flow because of entraining the exhaust gas around whose oxygen contents is greatly below 21%. The poor oxygen high temperature air flow mixes with the fuel for burning. Meanwhile, the exhaust gas inside the furnace passes through the regenerator 2 to be emitted outside the furnace. The sensible heat of exhaust gas is transferred to the regenerator 2 by the heat retainer. Finally it is emitted outside the furnace with a temperature of 150-200℃ by the reversing valve. The reversing valve switch with certain frequency makes the two regenerators to be in the alternative work status of regeneration and supply heat, whose generally reversing period is 30-200 seconds.

Regenerative burner presentation

1、DC-NGB1-SII:air single regenerative concentric jet flow regenerative burner (fuel: natural gas)

Feature: For the furnace which use natural gas, a greater significance that adopting regenerative combustion technology is to realize the poor oxygen combustion through the regenerative burner in addition to bringing energy-saving effect. It can make the flame volume increase and enhance, the temperature distribution be more uniform, thus the oxidation burning loss is reduced, heating or heat treatment quality and yield are improved . Considered from the environmental protection, the theoretical combustion temperature is very high for the high calorific value fuel, so it easy to produce massive NOx.But the poor oxygen combustion may reduce the NOx production quantity. The environmental protection significance is great.

2、C-NGB1-SII:air single regenerative concentric jet flow regenerative burner (fuel: mixed gas, clean coal-gas)

Features: The special structural design does not only bring the above advantage under poor oxygen combustion of gas, but also the problem of incomplete mix of similar burner in the past, short life of service and large amount of maintenance is resolved. By using this type of burner in the continuous industrial furnace, energy-saving rate is above 20% compared with the similar conventional industrial furnace, energy-saving effect of the discontinuous industrial furnace is more remarkable which reaches to above 30%.

3、DC-CGB1-S: air-gas double regenerative parallel jet flow regenerative burner (fuel: converter gas, blast furnace gas)

Features: By using air-gas double regenerative burner, the biggest significance is the blast furnace gas of lower calorific value can directly be used for industrial furnace whose furnace temperature is more than 1250℃. Moreover, by using this kind of burner, air and gas can be preheated to above 1000℃, flue gas is discharged whose temperature is less than 150℃, so it can also improve the energy-saving effect greatly.

4、DC-ZCGB2-SII:air single regenerative concentric jet flow selfregenerative burner (fuel: mixed gas, coal-gas)

Features: this is the latest product developed by our company. Its two regenerators reverse alternately, so the gas shut off valve is cancelled, so as to reduce the amount of equipment and maintenance. Because the gas is not shut off when reversing, there is no empty burning time, it can improve the combustion efficiency. This product is used for the small industrial furnace and steel ladle baker, the advantages are more prominent.

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