Is the investment and operating cost of membrane separation plant high?

Is the investment and operating cost of membrane separation plant high? Direct answer: equipment investment is proportional to the scale of working conditions, and most of the small and medium-sized gas projects are in the order of hundreds of thousands to hundreds of thousands; the operating cost is mainly based on electricity, and the comprehensive level is usually lower than that of the single condensation process-the comprehensive energy consumption of the combination of condensation and membrane is about 1/3 to 1/2 of the single condensation, because the membrane first concentrates the tail gas five to ten times, and only needs to treat the small volume of high concentration. Looking at the quotation alone, it is easy to distort the price. Only by combining investment, energy consumption, recovery income and maintenance for three to five years can the conclusion be reliable. In this paper, according to the investment composition, operating costs and economic judgment of the three-stage dismantling.

What constitutes an investment?

Equipment investment is determined by gas volume and process configuration: membrane module, vacuum pump, condensing unit, pretreatment and control system are the five major pieces, the larger the gas volume, the larger the membrane area and condensation scale, the investment goes up with the curve. There are still two pieces of investment that are easy to ignore: pretreatment configuration-insufficient defogging and filtration grade, discount of membrane life, and double the money saved; Automation and data access-according to management requirements, the higher the better. When comparing prices, the total price is comparable only when each scheme is pulled to the same caliber: gas volume, process route, material, installation and acceptance scope are aligned.

Where are the operating costs?

There are three main operating expenses: electricity charge-vacuum pump and condensing unit are the main power consumption, accounting for the majority of operating expenses. Frequency conversion configuration can obviously save electricity according to load adjustment. Maintenance fee-membrane components are cleaned periodically, vulnerable parts such as filter elements and seals are replaced annually. The replacement period of membrane is directly related to the cleanliness of feed. Pretreatment input and membrane life are in a trade-off relationship; testing and labor-emissions testing, parameter calibration and inspection labor. Membrane separation has no adsorbent material replacement and hazardous waste disposal costs, this ratio.activated charcoalRoute peace of mind is also a plus in the full cycle account.

How to judge economy

Judging the economy, there are three numbers: recovery amount-the amount and value of the annual recovery solvent are calculated according to the feed concentration, gas volume and recovery rate. For media with high concentration and recovery value, the recovery income can often cover the operation cost and have surplus. Energy consumption account-power consumption per unit recovery amount is a hard index of horizontal comparison scheme; Full-cycle account-investment plus three to five years of operating expenses minus recovery income to get net cost. Low concentration conditions with low recovery value have poor membrane economy, and the scheme should be matched separately when the treatment target turns to meet the discharge standard. For working conditions with recovery value, the membrane method can usually be calculated.

A suggestion to the decision maker: let the supplier calculate the recovery amount and energy consumption according to your measured working conditions, write the calculation basis into the plan, and don't accept the investment payback period promise of beating the head. Data complete plan, negotiation and acceptance have a grip.

Cost composition reference

Economic List

1. Measure the feed concentration and gas volume first, and then calculate the recovery amount;
2. The investment ratio is pulled to the same caliber item by item alignment;
3. Pretreatment configuration is not province, the protective film is to save money;
4. Priority frequency conversion configuration of vacuum pump and condensing unit;
5. Power consumption per unit recovery amount is taken as the hard index of the scheme;
6. Three to five-year full-cycle accounts are consolidated and measured before making decisions.

FAQ

How often do membrane components change and what is the proportion?

When the pretreatment is in place, the membrane life can reach several years, and the proportion of replacement fee is strongly related to the cleanliness of the feed. Doing a good job of defogging filtration is the key to depressing this cost, and dirty feed running membrane is the most expensive.

What is the approximate level of electricity consumption?

With the large difference between gas volume and concentration, the comprehensive energy consumption of condensation and film combination is about 1/3 to 1/2 of the single condensation.

Is it cost-effective to film low concentration tail gas?

The partial pressure difference is small, the permeation amount is low, and the economy of the membrane alone is poor; when the low concentration working condition is aimed at reaching the standard discharge, it is advisable to choose adsorption or other routes, or first use gas collection to increase concentration.

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.