How to calculate acetylene loss

The above is the total consumption of exhaust raw gas; by subtracting the amount recovered from this total, you get the actual consumption amount. (The recycled flow adsorption system has data; the calculation method is the same as above)

Statistics on the consumption for adsorption and venting of distillation off-gases: The current operating flow rate of the conversion system is 7,000 m³/h, while the average flow rate of the feed gas in the off-gas adsorption and recovery system is 500 m³/h. The VC content in the feed gas is 5%, and the C2H2 content is 25%. The adsorption system is currently completely empty. The estimated daily loss of raw gases, namely acetylene and vinyl chloride, is as follows: for acetylene, it’s 500 m³/h × 25% × 24 hours = 3000 m³ per day. This corresponds to a calcium carbide consumption of 3000 m³ / 280 = 10.7 tons, and a monomer consumption of 3000 m³ / 380 = 7.9 tons. The actual product processing volume handled by the adsorption system is 400 m³/h; thus, the daily consumption is 400 m³/h × 25% × 24 hours = 2400 m³ per day. This translates to a calcium carbide consumption of 2400 m³ / 280 = 8.57 tons per day, and a monomer consumption of 2400 m³ / 380 = 6.3 tons per day. The total monthly consumption is 8.57 tons per day × 22 days = 188.5 tons for calcium carbide, while the total monomer consumption for last month was calculated based on the 25 days that the adsorption system was in operation ； This month, the system was operational only for 8 days (from the 1st to the 5th, and from the 16th to the 18th). The reason was: a malfunction in the adsorption system program caused the control valves to fail to operate, resulting in the system being shut down for maintenance. Reason 2: Maintenance work on the acetylene process leads to the shutdown of this process, and as a result the adsorption system is also shut down. Reason three: The catalyst in the conversion system has failed; to ensure the quality of the crude monomer, the product gas recovered by the adsorption system is no longer sent to the conversion process. For the above reasons, the adsorption system cannot operate properly, which prevents the timely recovery of acetylene gas and results in high consumption of calcium carbide per unit of monomer produced.

Reply 1# xb12: Various operating conditions should be taken into account during calculations, in order to provide a reasonable basis for determining the scale of the exhaust gas recovery system. 1. Exhaust venting under normal flow conditions. 2. Exhaust venting volume when the low tower is not operating properly. 3. Considerations regarding operational flexibility. —— Reference data: I have 200,000 tons of PVC here, and the exhaust treatment system is designed for 950 cubic meters per hour. Recycling acetylene and VC