Fouling in LNG-vaporizers
Most LNG tankers have a vaporizer. These installations usually have thousands of tubes through which a cooling medium flows, usually seawater. The tubes of the vaporizer are therefore often made of titanium, due to its high resistance to fouling, corrosion and erosion. Nevertheless, after a while cleaning will have to be carried out to keep the tubes clean on the inside. Cleaning can be done in two ways: (1) mechanically, by means of rotating brushes or by shooting special projectiles through the tubes. Or (2) by means of a chemical cleaning, in which a special cleaning agent is circulated through the tubes.
Chemical cleaning (CIP)
Because seawater continuously flows through the tubes of the vaporizer, they will become fouled with various types of deposits over time. Think of: scale, rust, barnacles, mussels, and other mineral deposits. Typical fouling that is caused by sea water.
With chemical cleaning, a closed circuit is created, so that the cleaning agent (often a descaler) can flow through the tubes. This process takes several hours, depending on various factors. During cleaning, the descaler dissolves the deposits into a liquid suspension. The final result is that all deposits has been dissolved, and that the tubes are completely cleaned. The liquid that is left over can then be neutralized and discharged, this can be done in different ways.
Goodway Benelux supplies a multi-purpose descaler, also known as Scalebreak-MP, for the chemical-technical cleaning of an evaporative condenser. This is a biodegradable, industrial descaler that has been specially developed to remove limescale, rust, biological and other types of deposits. The descaler has various corrosion inhibitors, wetting, and penetrating agents, making it a very safe product that can be used on almost any type of material. Some features of Scalebreak-MP are listed below:
- High-performance descaler designed for technical systems
- Fortified to deliver high powered descaling while protecting base materials from excessive corrosion
- Safe on a wide range of materials including stainless steel and rubber
- Very effective against limescale, rust, bio fouling and more
- Biodegradable and exempted for the transport of hazardous substances, does not contain HCL (Hydrochloric Acid)
- Dissolves 3,5 KG of scale per 10 liters of product
Uchafu katika LNG-vaporizers Wengi LNG mizinga kuwa na vaporizer. Kwa kawaida mitambo hiyo huwa na maelfu ya mirija ambayo hutumiwa kutokeza maji ya baharini. Mabomba ya vaporizer kwa hiyo ni mara nyingi kufanywa ya titanium, kutokana na upinzani wake wa juu kwa fouling, kutu na mmomonyoko. Hata hivyo, baada ya muda fulani itabidi safisha ili kuweka mabomba safi ndani. Usafi waweza kufanywa kwa njia mbili: (1) kwa njia ya mashine, kwa kutumia brashi zinazozunguka au kwa kupiga risasi za pekee kupitia mirija. (2) Kwa njia ya kusafisha kemikali, ambayo ni wakala maalum wa kusafisha ni mzunguko kupitia mirija. Usafi wa kemikali (CIP) Kwa sababu maji ya bahari hutiririka kwa kuendelea kupitia mabomba ya vaporizer, itakuwa uchafu na aina mbalimbali za amana kwa muda. Fikiria: magamba, kutu, barnacles, mussels, na madini mengine. Uchafu wa kawaida unaosababishwa na maji ya bahari. Kwa kusafisha kemikali, mzunguko uliofungwa huundwa, ili kichocheo cha kusafisha (mara nyingi kichocheo) kiweze kutiririka kupitia mirija. Utaratibu huo huchukua saa kadhaa, ikitegemea mambo mbalimbali. Wakati wa kusafisha, descaler dissolves amana katika suspension kioevu. Matokeo ya mwisho ni kwamba amana zote zimefumuliwa, na kwamba mirija ni kusafishwa kabisa. Kioevu kilichobaki kinaweza kusafishwa na kutolewa, hii inaweza kufanywa kwa njia tofauti. Goodway Benelux hutoa desalers ya matumizi mengi, inayojulikana pia kama Scalebreak-MP, kwa ajili ya kusafisha kemikali ya kiufundi ya condensers evaporative. Hii ni biodegradable, viwanda descaler ambayo imekuwa hasa maendeleo ya kuondoa limescale, kutu, kibiolojia na aina nyingine ya amana. Desiccant ina inhibitors mbalimbali ya kutu, wetting, na penetrating wakala, na kufanya hivyo bidhaa salama sana ambayo inaweza kutumika juu ya karibu aina yoyote ya vifaa. Scalebreak MP ni high-performance decollete, iliyoundwa kwa ajili ya mifumo ya kiufundi, na ina nguvu ya kutoa high-powered decollete wakati kulinda vifaa msingi kutoka corrosion kupita kiasi, salama juu ya aina mbalimbali ya vifaa, ikiwa ni pamoja na chuma cha pua na mpira, ufanisi sana dhidi ya lime, kutu, bio-mchanga na zaidi, biodegradable na msamaha kwa ajili ya usafirishaji wa vitu hatari, haina HCl (Hydrochloric Acid).