How to calculate the investment payback period for membrane-based oil and gas recovery? The balance between recovery volume and operating costs

For the membrane-based oil and gas recovery device, meeting environmental standards is the bottom line. However, whether it can be installed and when it is worthwhile to install ultimately depends on the investment recovery period. The calculation of the recovery period is not complicated: the device investment is divided by the annual net income, which equals the value of the recovered oil products minus the annual operating expenses. The difficulty lies in how to obtain data from both ends - what caliber should be used to calculate the recovery volume, and how much should be allocated for electricity consumption and maintenance. If the data obtained is not accurate, the account will be distorted. This article breaks down this account by categories, and enterprises can fill in their own measured data to obtain the result. This is much more reliable than using someone else's conclusions to fit their own project.

Revenue side: How to estimate the recycling volume

The recovery volume depends on the tank size, turnover volume, and oil and gas concentration: oil depots and large gas stations estimate the recovery volume by multiplying the annual turnover volume by the volatilization loss coefficient. When actual concentration data is available, it is converted based on the actual measurements. The hydrocarbons evaporated from gasoline, after being recovered and liquefied, become refined oil products, which are converted based on the market oil price. This constitutes the major part of the revenue. Taking an oil depot with an annual turnover of 100,000 tons as an example, the volatilization loss is usually on the order of one-thousandth, and both the annual recovery volume and the corresponding value are significant. The revenue side should be calculated based on one's own data, rather than copying others' conclusions.

Expense side: What are the operating costs

The operating costs are divided into four categories on an annual basis: electricity consumption - compressors and vacuum pumps are the main electricity consumers, estimated based on installed power and annual operating hours; maintenance - consumables such as filter materials and seals, as well as annual maintenance costs; labor - devices with high automation levels can be incorporated into existing teams; and inspection - regular inspection fees for emission outlets. Among the four categories, electricity consumption accounts for the largest share. The temperature configuration of the condensation and membrane combination has a significant impact on electricity consumption. This item should be included in the comparison and selection during the scheme design stage, rather than discovering unexpectedly high electricity bills after commissioning.

How to calculate the payback period

The payback period is calculated by dividing the investment in the device by the annual net income. The investment includes equipment, installation, and supporting modifications; the net income is the annual value of recovered oil products minus the annual operating costs. For stations with high recovery value and large turnover volume, the payback period is generally within two to three years. For stations with small turnover volume, the accounts need to be calculated more carefully, and consideration can be given to skid-mounted configurations or phased investment. When calculating, it is recommended to conduct a sensitivity analysis - with oil prices, turnover volume, and electricity prices fluctuating by one level each, to see the range of changes in the payback period, making the decision more stable.

There are three common pitfalls when retrieving data: First, confusing the designed recovery volume with the actual recovery volume - the designed recovery rate is the value when the operating conditions meet the standard, and it should be discounted when the device load is not full; second, omitting the calculation of supporting renovation costs - the total cost of miscellaneous items such as tank farm pipelines and power capacity expansion is not small; third, mixing the conversion of recovered oil products based on internal settlement prices and market prices, and selecting one set of standards and specifying it clearly. Most of the time, accounting distortions are not due to calculation errors, but rather due to standards drift.

Key factors affecting the payback period

1. The turnover volume and measured concentration determine the ceiling of revenue;
2. The configuration of condensation temperature level determines the majority of power consumption;
3. Pre-treatment investment can extend the lifespan of the membrane, saving small amounts but incurring large losses;
4. The degree of automation should be compared to labor costs, and the cost of duty shifts should be included;
5. The maintenance cycle is implemented according to the records, and the losses caused by neglect far exceed the maintenance costs;
6. The reconciliation of recycling volumes is reviewed monthly, and if the data is distorted, the accounts will also be distorted.

Frequently Asked Questions

What is the typical payback period?

For oil depots and gas station projects with high turnover, the payback period is generally within two to three years; for stations with low turnover, the payback period should be calculated based on actual data, and if necessary, skid-mounted equipment or phased investment can be used to smooth out cash flow.

Is it worthwhile to visit a small station?

Let's look at two accounts: emission compliance is the bottom line that cannot be bypassed, while recycling value is an increment that can vary. For small stations, priority can be given to skid-mounted solutions and combined processes, keeping investment within a range that matches the amount of recycling. Only after the accounts are balanced should action be taken.

Who will settle this account?

The enterprise provides the turnover volume, electricity price, and site conditions, while the factory produces configurations and quotes based on the measured concentration. Both parties review the accounts together and examine the sensitivity range to avoid any arbitrary decisions by either party.

This article is compiled by Luoyang Wohong Petrochemical Equipment Co., Ltd., which provides design, manufacturing, and operation and maintenance services for condensation recovery, membrane separation recovery, and complete solvent recovery equipment to chemical and pharmaceutical enterprises. If you need process evaluation or scheme configuration, please feel free to contact us for discussion.