再生铝熔炼炉烧天然气，钱大半是让排烟带走的。传统烧嘴排烟温度常常冲到八百度往上，炉子还没把料化透，一大股热量先顺着烟道跑了。所以判断一台熔炼炉省不省气，先别盯烧嘴大小，先问一句：排烟温度压到多少。

A melting furnace that runs on natural gas loses most of its money through the flue. A conventional burner can push the exhaust gas temperature past 800°C — before the charge is even fully melted, a large share of the heat has already escaped up the stack. So when judging whether a furnace saves gas, do not look at burner size first; ask one question: how low is the exhaust gas temperature.

复合式燃烧系统

复合式燃烧系统（蓄热式燃烧 + 弥散燃烧），干的正是把这块跑掉的热量追回来。它的原理不复杂：炉子装两组蓄热体，一组排烟、一组进气，来回切换。高温烟气过蓄热体时，把热量存进去；换向后，进来的常温助燃空气再被这组蓄热体烘热，一路能预热到八百摄氏度左右，再进炉子烧。等于把本来要排掉的热，转手又喂回给炉子。排烟温度因此能从八百度往下降，排烟温度低于 250 摄氏度，热回收率能到八成以上。

he composite combustion system — regenerative combustion combined with diffusive combustion — is built precisely to recover that lost heat. The principle is simple: the furnace holds two sets of regenerators, one exhausting and one intaking, switching back and forth. When the hot flue gas passes through a regenerator, it deposits heat there; after the switch, the incoming cold combustion air is heated by that same regenerator, up to about 800°C, before it enters the furnace. The heat that would have been vented is turned around and fed back into the furnace. The exhaust gas temperature can therefore drop from over 800°C — the brochure specifies below 250°C — with heat recovery above 80%.

预热只是前半段，后半段是「怎么烧」。弥散燃烧不走集中猛火那条路，它让燃料在低氧、高温的空气里弥散着烧，炉膛里不出现一个局部的高温火点，而是整个空间温度铺匀。这一个改变，带来两笔账：一是没有局部过热，铝液表面不被高温火焰直接冲刷，烧损自然降下来；二是低氧燃烧，热力型氮氧化物的生成被压住，排出去的烟更干净。

Preheating is only the first half; the second half is how the fuel burns. Diffusive combustion does not rely on a concentrated, violent flame. It lets the fuel burn diffusely in low-oxygen, high-temperature air, so there is no single local hot spot in the chamber — temperature spreads evenly across the whole space. This one change brings two results: without local overheating, the molten surface is not directly scoured by high-temperature flame, so burning loss drops; and with low-oxygen combustion, the formation of thermal NOx is suppressed, so the exhaust runs cleaner.

选复合式燃烧系统，有三件事要盯。

第一，看排烟温度能不能写进合同——排烟温度就是余热回收做没做到位的直接证据，说「节能」不如写一个数。

第二，看炉温均匀性——弥散燃烧要的就是全炉膛温差小，温度铺得匀，料化得匀，烧损才控得住。

第三，看氮氧化物能不能达标——低氧燃烧是环保这条线的底气，排烟温度低和 NOx 低，往往是一起做到的。

Three things to watch when choosing a composite combustion system. 

First, whether the exhaust gas temperature can be written into the contract — that figure is the direct proof of how well heat recovery was done, and a written number beats the word "energy-saving." 

Second, furnace temperature uniformity — the point of diffusive combustion is a small temperature spread across the chamber, so the charge melts evenly and burning loss stays under control. 

Third, whether NOx can meet the standard — low-oxygen combustion is the backbone of the environmental line, and a low exhaust temperature usually comes together with low NOx.

巨晨装备在燃烧这一块，是把蓄热和弥散做成一套系统的：低温蓄热先把助燃空气预热到八百度，炉温超过八百度后自动切到弥散燃烧，既追回了排烟的热量，又用低氧弥散把烧损和氮氧化物一起往下压。落到结果上，是溶解阶段能耗做到 50 方/吨以内、综合 65 方/吨以内，氮氧化物引风机出口压到 100 毫克/标准立方米以下——这些数，都能写进验收、用连续三天的实测均值来复核。

In combustion, Jucheng Equipment builds regenerative and diffusive burning into one system: low-temperature regeneration first preheats the combustion air to 800°C, and once the furnace temperature exceeds 800°C it switches automatically to diffusive combustion — recovering the heat from the flue while using low-oxygen diffusion to push down both burning loss and NOx. In terms of results, melting-stage energy consumption is held within 50 m³/ton, total within 65 m³/ton, and NOx at the induced-draft fan outlet is kept below 100 mg/Nm³ — all of these can be written into acceptance and verified with a three-day measured average.

Q：复合式燃烧系统靠什么省气？

A：靠蓄热体把排烟余热回收来预热助燃空气到约 800℃，排烟温度从 800℃ 以上降到 250℃ 以下，热回收率八成以上。

Q: How does a composite combustion system save gas?

A: Regenerators recover flue-gas waste heat to preheat combustion air to about 800°C, dropping exhaust temperature from above 800°C to below 250°C, with heat recovery above 80%.

Q：弥散燃烧和普通烧嘴差在哪？

A：普通烧嘴是集中猛火、有局部高温火点；弥散燃烧是低氧、无局部高温、全炉膛均匀，既降烧损又降 NOx。

Q: What is the difference between diffusive combustion and a conventional burner?

A: A conventional burner is a concentrated flame with a local hot spot; diffusive combustion is low-oxygen, has no local overheating, and spreads temperature evenly across the chamber — reducing both burning loss and NOx.

Q：选燃烧系统最该先看哪个数？

A：看排烟温度能不能写进合同。排烟温度就是余热回收做没做到位的直接证据，一个数比「节能」两个字可靠。

Q: What figure should I check first when choosing a combustion system?

A: Whether the exhaust gas temperature can be written into the contract. That number is the direct proof of how well heat recovery was done, and one number is more reliable than the word "energy-saving."

Q：氮氧化物能做到多少？

A：低氧弥散燃烧抑制热力型 NOx，巨晨做到引风机出口 100 毫克/标准立方米以下，可写进验收实测复核。

Q: How low can NOx go?

A: Low-oxygen diffusive combustion suppresses thermal NOx; Jucheng holds it below 100 mg/Nm³ at the induced-draft fan outlet, verifiable in acceptance testing.