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.

從油水分離器6的底部間歇排出少量的酚油和水至酚油槽8，酚油槽中積累的油水混合物用倒油泵倒入洗滌器脫水后，即得酚油，再將其與焦油蒸餾所得的酚油混合脫酚,脫酚后的凈酚油送往油庫酚油成品槽。

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.

塔底的洗油用熱油循環(huán)泵15抽出，經(jīng)管式爐3的第二組爐管加熱到297~ 300°C后打回塔內(nèi)，從熱油循環(huán)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，經(jīng)冷卻器16冷卻后通過計量槽17流入洗油油庫。成品洗油含萘量應(yīng)小于10%，供粗苯工段煤氣洗苯用。從工業(yè)茶精餾塔的第46層塔盤側(cè)線采出溫度為219°C(含萘大于95%)的液體工業(yè)蔡，經(jīng)工業(yè)萘汽化冷凝冷卻器10冷卻至120°C左右，流入工業(yè)萘貯槽11，再經(jīng)轉(zhuǎn)鼓結(jié)晶機(jī)12冷卻結(jié)晶，即可得到白色片狀結(jié)晶一工業(yè)蔡。開停工時，塔內(nèi)油及水可從塔底放至地下放空槽。工業(yè)

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

萘不合格時，可由汽化冷凝冷卻器后窺視鏡下切換至中間槽。中間槽中的油可用倒油泵倒回原料槽處理。

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.

除了以上操作指標(biāo)外，還要控制如下幾點:

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

(1)在精餾塔操作中應(yīng)將溫度控制在199 ~201C， 使塔頂采出的酚油中含萘量保持在26%~30%。若塔頂溫度過低，則酚油含萘量可降至26%以下，這樣有可能導(dǎo)致工業(yè)萘質(zhì)量不合格;若塔頂溫度過高，則酚油含茶量將有可能上升，這樣有可能使工業(yè)萘的產(chǎn)量有所下降。塔頂溫度可用酚油的回流量來進(jìn)行調(diào)節(jié)

(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)在精餾塔操作中，應(yīng)將塔底溫度控制在270~ 273°C,使塔底溫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%.