Single furnace and double tower process flow:

单炉双塔工艺流程与双炉双塔工世流程差别仅在于，单炉双塔管式加热炉辐射段分为2组。初馏塔底油用热油泵送入管式炉对流段和辐射段的其中一组加热后，再返回初馏塔塔底蒸发段以循环供热。精馏塔底油用热油泵送入管式炉辐射段的另一组加热后，再返回精馏塔蒸发段以循环供热。其余完全与双炉双塔工艺流程相同。

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个塔靠1台加热炉供热，当工业萘原料的温度、组成等发生变化时，加热炉向2个塔供给的热量不好平衡，操作难度大，逐渐被双炉双塔工艺取代。

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.

单炉单塔工艺流程：

Single furnace and single tower process flow:

此流程采用1台管式炉和1个精馏塔，从塔顶采出脱酚油，从侧线切取工业萘，从热油循环泵出口采出塔底油（原料不同，塔底产品也不同）。

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).

已洗含萘馏分于原料贮槽加热、静置脱水后，用原料泵送往管式炉对流段，然后进入工业萘精馏塔。由塔顶逸出的酚油蒸气，经冷凝冷却、油水分离后，流入回流槽。由此，一部分酚油送往塔顶回流，剩余部分作为产品采出。塔底油用热油循环泵送至管式加热炉辐射段加热后返回塔底，以此供给精馏塔热量。同时从热油泵出口分出一部分作为产品采出，经冷却后进入产品槽。工业萘由精馏段侧线采出，经汽化冷凝冷却器冷凝冷却后进入工业萘产品槽，然后转入转鼓结晶机结晶包装。

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.

单炉单塔工艺流程是在单炉双塔工艺流程基础上发展起来的新工艺，它具有流程简单、操作简便、技术先进等优点，目前国内还有部分工厂采用这种流程。单炉单塔流程要求原料含萘高，从侧线切取工业萘，需要理论塔板数多，工业萘含萘量相对低一些，但也可以达到工业萘的萘含量大于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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