The solvent recovery device turns the tail gas into condensate, and the account is only half: the recovered solvent comes out of the device and is reused or exported, separated by two sections of storage and transportation. There are problems in this section-volatilization loss, mixed quality, safety and compliance-and the value recovered in front is still discounted. How to match the storage tank, how to use the nitrogen seal and how to keep the ledger are the three-piece sets of management in this section. According to these three things, this article makes it clear that the value of recycled solvents will fall into bags from the device to the factory.
Storage tank configuration is grouped according to solvent types: different types are stored in tanks, tank capacity is calculated according to batch output and turnover cycle, and tank configuration according to output of 7 to 15 days is a common caliber; Materials and accessories are checked according to medium-alcohol-containing aqueous solvent should pay attention to anti-corrosion and drainage outlets in the tank, and breathing valve and condensation reflux configuration of low boiling point solvent cannot be saved. The tank farm shall be arranged to set aside the turning radius of loading and unloading trucks and fire fighting passages, and the liquid level gauge and high and low liquid level alarm shall be provided on both sides, and the anti-risk tank and evacuation shall be provided. Anti-seepage and cofferdam shall be made on the ground of tank farm, and the connection between drainage ditch and accident pool shall be designed according to emergency caliber.
Nitrogen seal is standard for low boiling point and easily oxidizable solvent storage tanks: the gas phase space in the tank is covered with nitrogen micro positive pressure, which isolates air to reduce volatilization and oxidation, and the pressure in the tank is stable and reduces the action frequency of the breathing valve. Nitrogen sealing system is equipped with pressure monitoring and overpressure relief-there shall be a relief outlet under the working condition of failure of nitrogen pressure regulating valve, and the relief gas shall not be directly connected to the recovery pipe network. The tightness of the nitrogen seal shall be checked periodically: the tank top accessories, the sealing surface of the breathing valve and the nitrogen pipeline joint shall be tested for leakage point by point. The abnormal increase of nitrogen consumption is the signal of sealing problems. In addition to the nitrogen seal of the water-soluble alcohol storage tank, the water content should be controlled. The bottom of the tank should be cut off periodically, and the water should be cut off to the recovery system.
The storage and transportation ledger records all the ins and outs of the solvent: batch of incoming tanks, testing data, destination of outbound, transfer vehicles and quantity, one account for each tank, and batch correspondence. The key documents in the transfer link are linked to the tank account-loading list, test report, recipient's receipt and receipt are filed one by one, and the qualification verification and loading and unloading operation procedures of transport vehicles are included in the ledger management. The value of the ledger is in two places: internally, it is the basis for cost accounting-how much is recovered, how much is lost, and how much is returned, so that the accounts can be continuously optimized. Externally, it is the confidence of compliance-when supervision and customer tracing, the chain is turned to the end.
There is another item in storage and transportation management that is easy to be underestimated: identification management-identification of tank number, medium name and dangerous characteristics is updated all the year round, and faded and fuzzy identification is updated in time. The starting point of a mixed-quality accident is often a sign that cannot be seen clearly.
| Matter | Configuration caliber | Management Points |
|---|---|---|
| Grouping tanks | Tank by variety | Turnover of tank capacity by batch |
| Arrangement of tank area | Fire escape with turning radius | anti-seepage cofferdam |
| nitrogen sealing | Micro positive pressure coverage | Discharge connection to recovery pipe network |
| Seal Management | Point-by-point leak test of accessories | Check if nitrogen consumption is abnormal |
| Ledger | One can, one account, batch correspondence | Document Filing Chain |
| Identifier | Medium characteristics of tank number | New when it fades |
Small batches of compatible components with the same recovery path can be combined into cans, and the tank capacity is calculated according to the combined batch.
For solvents with low boiling point, easy oxidation or sensitive to moisture, the benefits of volatilization loss and quality protection are obvious. Varieties with stable properties under normal temperature and pressure can be simplified according to the breathing valve and condensation reflux.
Both paper and electronic can be used. The key is that the fields are fixed: batch, quantity, inspection items, whereabouts and handers. There is a systematic use of scanning codes in and out of the warehouse, and a fixed form for manual management. The bottom line is the consistency of accounts.
This article by LuoyangWohong PetrochemicalEquipment Co., Ltd. arranges that the company provides design, manufacturing and operation and maintenance services for condensation recovery, membrane separation recovery and complete solvent recovery devices for chemical and pharmaceutical enterprises. If you need process evaluation or scheme configuration, please contact and exchange.
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