Single furnace and double tower process flow:

單爐雙塔工藝流程與雙爐雙塔工世流程差別僅在于，單爐雙塔管式加熱爐輻射段分為2組。初餾塔底油用熱油泵送入管式爐對流段和輻射段的其中一組加熱后，再返回初餾塔塔底蒸發(fā)段以循環(huán)供熱。精餾塔底油用熱油泵送入管式爐輻射段的另一組加熱后，再返回精餾塔蒸發(fā)段以循環(huán)供熱。其余完全與雙爐雙塔工藝流程相同。

The difference between single furnace and double tower process flow is that the radiation section of single furnace and double tower tube furnace is divided into two groups. The bottom oil of the primary distillation tower is fed into one group of convection section and radiation section of tubular furnace by hot oil pump for heating, and then returns to the evaporation section at the bottom of primary distillation tower for circulating heating. The bottom oil of rectifying tower is sent to another group of radiation section of tubular furnace by hot oil pump for heating, and then returns to evaporation section of rectifying tower for circulating heating. The other processes are completely the same as that of double furnace and double tower.

由于2個塔靠1臺加熱爐供熱，當工業(yè)萘原料的溫度、組成等發(fā)生變化時，加熱爐向2個塔供給的熱量不好平衡，操作難度大，逐漸被雙爐雙塔工藝取代。

Because two towers are supplied by one heating furnace, when the temperature and composition of industrial naphthalene raw materials change, the heat supplied by the heating furnace to the two towers is not well balanced and the operation is difficult, so it is gradually replaced by the double furnace and double tower process.

單爐單塔工藝流程：

Single furnace and single tower process flow:

此流程采用1臺管式爐和1個精餾塔，從塔頂采出脫酚油，從側線切取工業(yè)萘，從熱油循環(huán)泵出口采出塔底油（原料不同，塔底產品也不同）。

In this process, a tubular furnace and a distillation column are used to extract the dephenolized oil from the top of the tower, cut the industrial naphthalene from the side line, and extract the tower bottom oil from the outlet of the hot oil circulating pump (different raw materials lead to different products at the bottom of the tower).

已洗含萘餾分于原料貯槽加熱、靜置脫水后，用原料泵送往管式爐對流段，然后進入工業(yè)萘精餾塔。由塔頂逸出的酚油蒸氣，經冷凝冷卻、油水分離后，流入回流槽。由此，一部分酚油送往塔頂回流，剩余部分作為產品采出。塔底油用熱油循環(huán)泵送至管式加熱爐輻射段加熱后返回塔底，以此供給精餾塔熱量。同時從熱油泵出口分出一部分作為產品采出，經冷卻后進入產品槽。工業(yè)萘由精餾段側線采出，經汽化冷凝冷卻器冷凝冷卻后進入工業(yè)萘產品槽，然后轉入轉鼓結晶機結晶包裝。

The washed naphthalene containing fraction is heated in the raw material storage tank and dehydrated in static state, and then sent to convection section of tubular furnace by feed pump, and then into industrial naphthalene distillation tower. The phenol oil vapor escaping from the tower top flows into the reflux tank after condensation cooling and oil-water separation. As a result, a part of the phenol oil is sent to the tower top for reflux, and the remaining part is produced as product. The tower bottom oil is pumped by hot oil circulation pump to the radiation section of the tubular heater for heating and returning to the bottom of the tower to supply heat to the distillation column. At the same time, a part of the hot oil pump is separated from the outlet of the hot oil pump to be produced as a product and then cooled into the product tank. The industrial naphthalene is extracted from the side line of the rectification section, condensed and cooled by the vaporization condenser, and then transferred to the industrial naphthalene product tank, and then transferred to the drum crystallizer for crystallization packaging.

單爐單塔工藝流程是在單爐雙塔工藝流程基礎上發(fā)展起來的新工藝，它具有流程簡單、操作簡便、技術先進等優(yōu)點，目前國內還有部分工廠采用這種流程。單爐單塔流程要求原料含萘高，從側線切取工業(yè)萘，需要理論塔板數多，工業(yè)萘含萘量相對低一些，但也可以達到工業(yè)萘的萘含量大于95%的要求。

Single furnace and single tower process is a new process developed on the basis of single furnace and double tower process. It has the advantages of simple process, simple operation and advanced technology. At present, some domestic factories adopt this process. The process of single furnace and single tower requires high naphthalene content in raw materials. It needs more theoretical plates to cut industrial naphthalene from side line. The naphthalene content of industrial naphthalene is relatively low, but it can also meet the requirement that the naphthalene content of industrial naphthalene is more than 95%.

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