The mixture of washed naphthalene oil and wash oil is indirectly heated to 80~90 ° C in raw material tank 1, and then it is still for dehydration. Then it is pumped out by raw material pump 2 and sent to the second group of furnace tubes of tubular furnace 3 to preheat to 240~250 ° C, and enters the distillation tower 4 from the 26th tray. The top vapor phase temperature is controlled at 199~201 ° C. The gas escaping from the tower top enters the oil-water separator 6 after condensation and cooling by the phenol oil condenser 5, and the phenol oil separated from water enters the reflux tank 7, The phenol oil containing less than 10% phenol and less than 35% naphthalene is refluxed from the bottom of the reflux tank with the phenol oil reflux pump 9.

从油水分离器6的底部间歇排出少量的酚油和水至酚油槽8，酚油槽中积累的油水混合物用倒油泵倒入洗涤器脱水后，即得酚油，再将其与焦油蒸馏所得的酚油混合脱酚,脱酚后的净酚油送往油库酚油成品槽。

A small amount of phenol oil and water is discharged intermittently from the bottom of the oil-water separator 6 to the phenol oil tank 8. The accumulated oil-water mixture in the phenol oil tank is poured into the scrubber for dehydration by the reverse pump to obtain the phenol oil, which is then mixed with the phenol oil obtained by tar distillation for dephenolization, and the purified phenol oil after dephenolization is sent to the phenol oil product tank of the oil depot.

塔底的洗油用热油循环泵15抽出，经管式炉3的第二组炉管加热到297~ 300°C后打回塔内，从热油循环泵15的出口分

The washing oil at the bottom of the tower is pumped out by the hot oil circulating pump 15, heated to 297~300 ° C by the second group of furnace tubes of the tubular furnace 3, and then returned to the tower, and separated from the outlet of the hot oil circulating pump 15

出一部分洗油，经冷却器16冷却后通过计量槽17流入洗油油库。成品洗油含萘量应小于10%，供粗苯工段煤气洗苯用。从工业茶精馏塔的第46层塔盘侧线采出温度为219°C(含萘大于95%)的液体工业蔡，经工业萘汽化冷凝冷却器10冷却至120°C左右，流入工业萘贮槽11，再经转鼓结晶机12冷却结晶，即可得到白色片状结晶一工业蔡。开停工时，塔内油及水可从塔底放至地下放空槽。工业

A part of the washing oil flows into the washing oil depot through the metering tank 17 after being cooled by the cooler 16. The naphthalene content of the finished washing oil should be less than 10%, which is used for washing benzene with the gas in the crude benzene section. The liquid industrial naphthalene with a temperature of 219 ° C (containing more than 95% naphthalene) is extracted from the side line of the 46th tray of the industrial tea distillation tower, cooled to about 120 ° C by the industrial naphthalene vaporization condenser 10, and then flows into the industrial naphthalene storage tank 11, and then cooled and crystallized by the rotary drum crystallizer 12 to obtain the white flake crystalline industrial naphthalene. During startup and shutdown, the oil and water in the tower can be discharged from the tower bottom to the underground vent tank. Industry

萘不合格时，可由汽化冷凝冷却器后窥视镜下切换至中间槽。中间槽中的油可用倒油泵倒回原料槽处理。

When naphthalene is unqualified, it can be switched to the intermediate tank under the rear view mirror of the vaporization condenser. The oil in the intermediate tank can be pumped back to the raw material tank for treatment.

除了以上操作指标外，还要控制如下几点:

In addition to the above operational indicators, the following points should be controlled:

(1)在精馏塔操作中应将温度控制在199 ~201C， 使塔顶采出的酚油中含萘量保持在26%~30%。若塔顶温度过低，则酚油含萘量可降至26%以下，这样有可能导致工业萘质量不合格;若塔顶温度过高，则酚油含茶量将有可能上升，这样有可能使工业萘的产量有所下降。塔顶温度可用酚油的回流量来进行调节

(1) During the operation of the distillation column, the temperature should be controlled at 199~21C to keep the naphthalene content in the phenol oil extracted from the top of the column at 26%~30%. If the tower top temperature is too low, the naphthalene content of the phenol oil can be reduced to below 26%, which may lead to unqualified industrial naphthalene; If the tower top temperature is too high, the tea content of phenol oil may increase, which may reduce the output of industrial naphthalene. The tower top temperature can be adjusted by the return flow of phenol oil

(2)在精馏塔操作中，应将塔底温度控制在270~ 273°C,使塔底温度采出的洗油中含萘量保持在3%~8%。

(2) During the operation of the distillation tower, the tower bottom temperature should be controlled at 270~273 ° C, so that the naphthalene content in the wash oil produced at the tower bottom temperature is kept at 3%~8%.