Current situation and existing problems of industrial naphthalene area

萘在遠低于沸點溫度下，就具有很大的蒸氣壓，因而在加熱時，固體萘能夠不經過液態直接變為萘蒸氣，而萘蒸氣在冷卻時又可不經過液態而直接轉變為銀白色固體。因此，固體和液體萘均能以這種形式轉變為萘粉塵。萘粉塵的主要散發點有：萘的貯槽、萘的成型設備等。

When the temperature of naphthalene is far below the boiling point, it has a large vapor pressure. Therefore, when heated, solid naphthalene can directly change into naphthalene vapor without going through liquid, and when cooled, naphthalene vapor can directly change into silver white solid without going through liquid. Therefore, both solid and liquid naphthalene can be transformed into naphthalene dust in this form. The main emission points of naphthalene dust include: naphthalene storage tank, naphthalene forming equipment, etc.

某焦化廠的工業萘產品槽區域包括6個工業萘儲槽、液萘發貨裝置和萘結片系統，廢氣源主要有：6個工業萘槽的放散氣(2個工業萘高置槽、3個工業萘產品槽、油配裝置區1個3000m3工業萘大槽)、液萘發貨產生的廢氣、萘結片機組產生的廢氣。工業萘高置槽、工業萘產品槽、工業萘大槽、液萘發貨、萘結片機組產生的萘揮發廢氣，屬于非甲烷總烴。

The industrial naphthalene product tank area of a coking plant includes 6 industrial naphthalene storage tanks, liquid naphthalene delivery unit and naphthalene flake system. The waste gas sources mainly include: the exhaust gas of 6 industrial naphthalene tanks (2 industrial naphthalene high-level tanks, 3 industrial naphthalene product tanks, 1 3000m3 industrial naphthalene tank in the oil distribution unit area), the waste gas generated by liquid naphthalene delivery and the waste gas generated by naphthalene flake unit. The naphthalene volatile waste gas generated by industrial naphthalene high setting tank, industrial naphthalene product tank, industrial naphthalene large tank, liquid naphthalene delivery and naphthalene flake unit belongs to non methane total hydrocarbon.

萘結片機組產生的廢氣有一套布袋式捕集裝置，主要是將萘結片生產過程中產生的升華萘通過排風機抽入脈沖袋式除塵器，升華萘被布袋捕集回收，尾氣經消聲器由煙囪外排。目前運行效果良好，但6個工業萘儲槽、液萘發貨產生的廢氣沒有收集裝置和設施，產生的廢氣無組織排放，嚴重影響了環境。工業萘產品槽區域廢氣主要存在如下問題：1)工業萘槽無廢氣處理設施，升華萘容易通過槽頂取樣口、放散口逸出，影響環境;2)工業萘槽收送料前后均采用蒸氣吹掃，吹掃作業會造成槽內升華萘從槽頂逸出，影響環境;3)液萘發貨產生的廢氣未經處理無組織排放，影響大氣環境。

The waste gas generated by the naphthalene flake unit has a set of bag type capture device, which mainly pumps the sublimated naphthalene generated in the production process of naphthalene flakes into the pulse bag dust collector through the exhaust fan, the sublimated naphthalene is captured and recovered by the bag, and the tail gas is discharged from the chimney through the muffler. At present, the operation effect is good, but the waste gas generated by 6 industrial naphthalene storage tanks and liquid naphthalene delivery has no collection devices and facilities, and the waste gas is discharged unorganized, which has seriously affected the environment. The waste gas in the industrial naphthalene product tank area mainly has the following problems: 1) there is no waste gas treatment facility in the industrial naphthalene tank, and the sublimated naphthalene is easy to escape through the sampling port and discharge port on the tank top, affecting the environment; 2) The industrial naphthalene tank is purged by steam before and after receiving and feeding. The purging operation will cause the sublimated naphthalene in the tank to escape from the tank top and affect the environment; 3) The waste gas generated from the delivery of liquid naphthalene is discharged without treatment, affecting the atmospheric environment.