Heat exchanger fouling mitigation and cleaning techniques pdf

This handbook presents the most important technologies concerning the reduction of fouling in heat exchangers and the appropriate technologies of removal and cleaning. Although the techniques used to clean the surfaces of an industrial heat exchanger are varied, the most common methods to clean the internal surface of the pipes are air, water, and water steam. The initiation period and the roughness delay time for particulate fouling are very small 4. Fundamentals and applications santa fe, new mexico, usa. Where u is overall heat transfer coefficient and uclean is clean heat transfer coefficient.

A is the heat transfer area of exchanger of which the design value is known to be 1843 m2. On the other ha nd unique and effective arrangements may be. Online cleaning technique for mitigation of biofouling in heat. Even when plant data are used to give an estimate of local fouling rates, these numerical codes are criticized because the. Heat exchanger fouling and cleaning conference series. The heat exchanger fouling was limiting run length. The fouling of heat exchangers may be defined as the accumulation of unwanted deposits on heat transfer surfaces. Heat exchanger fouling refers to a physical deposit on the solid between the two heat transfer fluids and it causes a.

A truly zero fouling heat exchanger must have zero fouling on the tubeside as well as on the shellside. The level of fouling in a heat exchanger could be calculated by the following approximate expression, which gives the value of the fouling thermal resistance rf. Heat exchanger fouling and cleaning conference 2017 1. A major consideration for fouling conditions must be the ease with which the heat exchanger may be cleaned in service techniques for cleaning heat exchangers are described in chapter 15, allowance for the method of cleaning should be a feature of the preliminary concept. Biyearly conferences on heat exchanger fouling have been organised by engineering. Online cleaning technique for mitigation of biofouling in. In the co2 scrubbing process three plate heat exchangers are switched in parallel, two in operation a and b and one in standby c. In this respect, cleaning is a responsive fouling mitigation technique, that is, it responds to the consequences of the fouling problem rather than anticipates it and takes actions to avoid its occurrence. Modeling fouling mitigation options for cellulosic ethanol distillation w.

Crystallization fouling, heat exchanger, heat transfer coefficient, glass bead, mitigation 1. Pdf fouling phenomenon and its effect on heat exchanger. It reduces the heat recovery and restricts the fluid flow in a heat exchanger by. Fouling and fouling mitigation on heat exchanger surfaces 509 fig. Chemical cleaning of oil refinery heat exchangers the need for a joint effort, himanshu m. Fouling is enhanced by the heat exchanger surface temperature and concentration of the foulant in the solution.

The heat transfer performance and efficiency decreases due to the fouling of the heat exchanger plates and tubes resulting in additional fuel consumption and increased greenhouse gases. The zero fouling heat exchanger explained in this article is derived from the wellknown self cleaning fluidized bed heat exchange technology where the self cleaning action is only employed in the tubes. Show full abstract fouling layer and shortened heat exchanger operation life. Heat exchanger fouling and cleaning xiii 2019 june 2 7, 2019, warsaw conference flyer pdf synopsis. Oily wastewater is also generated during heat exchanger cleaning. Volume 32, 2011 issue 34 submit an article journal homepage. Pdf fouling and fouling mitigation on heat exchanger. A variety of offline and online cleaning techniques to restore heat exchanger ef. Fouling is a resistance to energy transfer between fluids in pro cess equipment 1. Mitigation of crystallization fouling in double pipe heat. However, one major phenomenon that limits heat exchanger performance is attributed to fouling. Fouling and fouling mitigation on heat exchanger surfaces. Petrosync heat exchanger fouling mitigation technology.

They are commonly used in wide range of application from. However many mitigation techniques of fouling are harsh to the environment. As a result fouling causes huge economic loss due to its impact on initial cost on heat exchanging operation, operating cost, mitigation measures and performance. Fouling of heat transfer surfaces and its mitigation. This book will provide information about fouling mitigation in general and the ecofriendly methods of. The findings could support in developing the improved heat exchanger material surfaces, retain efficiency of the heat exchangers, and prolong their continuous operation. Written by experts from germany, uk and the usa, this book is a reliable adviser for engineers, managers, technicians.

Integration of experimental and novel modeling techniques. As the preheat exchangers fouled, the heater inlet temperature declined, resulting in an increased potential for twophase flow in the heater. Furthermore, cost penalties associated with heat exchanger fouling are estimated to be roughly 0. Fouling resistance is enhanced by the surface thermal conductivity. Their fouling tendency and potential cleanup, george f. It is important that a fouling detection method can follow the process in. This invariably is due to the period of heat exchanger cleaning and additionally due. Fouling of heat exchangers heat exchanger heat transfer. Pdf fouling of heat transfer surfaces and its mitigation. Fouling in heat exchangers 59 heat flux is high, as in steam generators, fouling can lead to local hot spots resulting ultimately in mechanical failure of the heat transfer surface. Pdf fouling and fouling mitigation on heat exchanger surfaces. Fouling phenomena are common and diverse, ranging from fouling of ship hulls, natural surfaces in the marine environment marine fouling, fouling of heat transfer components through ingredients contained in cooling water or gases, and even the development of plaque or calculus on teeth or deposits on solar panels on mars, among other examples.

Fouling mitigation in food processes by modification of. There will also be further discussion on system supports, maintenance and cleaning of heat exchangers and ecofriendly means of fouling mitigation, where it will incorporate coatings, additives, process parameters, material surfaces etc. Recent advances in heat exchanger fouling research, mitigation, and cleaning techniques. Chunangady venkateswaran pushpanathanz abb lummus heat transfer, bashir. Many mitigation and cleaning techniques that have found their way into. Modeling fouling mitigation options for cellulosic ethanol. Fouling of heat exchangers in processing industries is a chronic operating problem. Fundamentals and applications engineering conferences international year 2003 fouling mitigation using helixchanger heat exchangers bashir i. Fouling investigation of brazed plate heat exchangers david j. Online cleaning techniques have a clear advantage over offline cleaning techniques, as they do not require partial or complete shutdown of the process for cleaning, which is critical in power plants. This handbook presents, now in the 2nd completely worked over and enlarged edition, the most important technologies concerning the reduction of fouling in heat exchangers beginning with constructional disposition, prevention measures and the appropriate technologies of removal and cleaning. Fouling mitigation of a reboiler by optimization of additive and operating conditions, shinji isogai and mitsutaka nakamura article pdf.

The naphtha hydrotreater nht feedeffluent exchangers at a us refinery were experiencing severe fouling. The high costs associated with fouling have facilitated the urgency in solving this complex. Heat transfer engineering volume 32, 2011 issue 34. Mitigation of fouling in refinery heat exchanger networks. Such effects lead in most cases to production losses and increased maintenance costs. A method for optimizing the cleaning schedule in large continuously operating heat exchanger networks hens such as refinery crude preheat trains is presented. The foulant layer imposes an additional resistance to heat transfer and the narrowing of the flow area, due to the presence of deposit, results in an increased velocity for a given volumetric flow rate. Offline chemical cleaning is a technique that is used very frequently to clean exchangers. Optimization of operating conditions for mitigating. Heat exchangers basics design applications intechopen. Figure 1 lists the main methodologies for the mitigation of fouling in industrial heat exchangers. It includes also storage of thermal energy and geothermal energy use, directly or by application of heat pumps.

The decreasing price of oil and the increasing cost of energy force engineers to continuously face the challenges of designing highly effective equipment, developing innovative enhancements for heat transfer, and reducing equipment size, mass and cost. Bennett, 2005, fouling mitigation by design, eci symposium series, volume rp2. Scholltailored surfaces for the mitigation of fouling in heat exchanger. Recent advances in heat exchanger fouling research. Therefore, it is necessary to strengthen the daily operation monitoring and fouling cleaning for plate heat exchanger. Fouling mitigation using helixchanger heat exchangers.

Tube heat exchanger an overview sciencedirect topics. Numerous studies have shown that heat exchanger fouling may lead to 1 2. Costs due to overdesign, additional fuel consumption and maintenance, loss of production, etc. Mitigation of heat exchanger fouling digitalrefining. The choice of cleaning agent depends on the degree of adhesion of the tanks and the design of the heat exchanger. Heat exchanger fouling and cleaning challenges and. In addition numerous studies have shown that heat exchanger fouling may lead to 1 2. Based on this, various studies and approaches have focused on reduction, elimination and mitigation. Heat exchanger fouling and cleaning conference 2017.