How many years can membrane be used for membrane oil and gas recovery equipment? How much does it cost to change a membrane? Direct answer: The nominal life of manufacturers is generally between five and eight years. In fact, the project is restricted by three conditions-whether pretreatment is in place, whether intake air is stable and stable, whether patrol inspection is adhered to, stations with proper maintenance run to the nominal upper limit or even higher, and stations with rough operation and maintenance will have performance diving in two or three years. The cost of membrane replacement is the largest in the operation and maintenance budget of membrane devices based on the number and specifications, when purchasing, the price of the membrane should be asked at the same time as the replacement cycle. The membrane is the only core material in this device that will "depreciate to zero". If you manage it well, the long-term economy of the device will stand. In this paper, the influence factors of life, life signal and cost composition are clearly explained.
Three key factors. First, the cleanliness of air intake: liquid droplets, particles and sludge entering the separation layer will cause pollution and physical damage, and the pretreatment filter screen is not an option, but a life-saving symbol for the membrane; Second, the stability of air intake: large fluctuations in pressure and flow will cause the membrane layer to bear alternating loads, resulting in attenuation of long-term impact acceleration performance; Third, the corrosiveness of the operating environment: high-humidity and high-corrosive gas phase will erode the supporting layer and seals. The first of the three factors is the most easily out of control-the pressure difference of the filter screen rises and no one is in charge. After the dirty blockage, the air flow is short-circuited and the local concentration exceeds the design, and the film layer is inevitably damaged.
There are clear engineering signals for membrane performance attenuation: the emission concentration is on the rise for a long time, while there is no abnormality in pretreatment and driving force investigation; The recovery rate decreases but the operating parameters of the unit are normal. Under the same working conditions, the load of vacuum pump increases and the power consumption goes up to a higher level. These three signals are checked in sequence-pre-treatment first, then driving force, and finally doubt the membrane. Don't reverse the sequence. Changing the membrane as soon as it comes up is the most expensive way to troubleshoot. The recovery rate curve at the initial stage of operation is left as the baseline, and all fluctuations thereafter can be compared to the baseline, and the period of rapid drop can almost correspond to an intake abnormal event.
The money for changing the membrane once is divided into three pieces: the membrane module itself, in terms of specifications and quantity, is absolutely the largest; Construction costs, including shutdown, disassembly and assembly, seal replacement and system recovery; Opportunity cost, equipment outage during shutdown, recovery and emission indicators are affected. Details worth discussing in the contract: whether the membrane is supplied by group, whether the old components are recycled at a discount, and whether the manufacturer provides performance retest services. If you spread these three pieces over the full life cycle, the average annual cost is a comparable figure-only the unit price will be "low-cost film short life" routine.
In daily actions, there are three most effective ways to extend life: pretreatment varies calendars according to pressure difference management; The intake pressure and flow are stable to avoid frequent and large adjustment of the unit. Take the initiative to do performance evaluation after each abnormal intake event, and don't wait for annual detection to find attenuation. Conditional sites take samples of the separation layer every six months for inspection or do online performance tests, turning "broken and then" into "state maintenance". These actions increase the inspection workload and save the cost of early replacement of the entire batch of components.
| Cost item | Constitute | Description |
|---|---|---|
| membrane module | By specification and quantity | Absolutely big head, talk about bulk and old piece discount. |
| Construction cost | Restoration of seal after shutdown | Including system recovery and debugging |
| Opportunity cost | Recovery loss during shutdown | Advance Spare Parts Compression Shutdown |
| Full-cycle amortization | Total cost divided by years of use | more comparable than unit price |
| life extension input | Inspection and testing labor | Small investment saves big pieces |
Partially reversible pollution can be, the manufacturer has a special cleaning and regeneration process; physical damage and aging are irreversible. Do a performance test to confirm the type of attenuation before cleaning. Do not treat physical damage as contamination.
Generally, it is replaced by group or batch. The performance difference of mixing old and new components will cause uneven airflow distribution, which will affect the overall performance. Listen to the manufacturer's batch suggestions.
Three things are written in the contract: membrane module price and warranty period, whether the old module is recycled at a discount, and whether the performance retest service is included. Another full life cycle cost estimate is needed to put the average annual cost on the table.
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.
Mr. Li 13526990215
Hotline
