DongHwa Entec

Commissioning and Installation of Heat exchanger Commissioning and Installation 1. How to install a Heat Exchanger The correct method of heat exchanger installation varies depending upon the exact type of unit and the environment of operation. For installations instructions please refer to one of our Installation and Operation Manuals Shell and Tube Heat Exchangers – IOM Brazed Plate Heat Exchangers – IOM 2. How to increase the lifetime of a Heat Exchanger Heat exchangers are manufactured from robust materials, have no moving parts and operate at a variety of different pressures and temperatures, therefore if a heat exchanger is used in the correct way then there is no reason why it shouldn’t be able to remain operational for many years. To help increase the operational lifetime of a heat exchanger there are several steps that should be taken; Make sure the design data is accurate – If you a...

Designing a Heat Exchanger 1. How is a Heat Exchanger designed? To be able to select a heat exchanger, we need to know; Primary circuit fluid type, temperature and flow rate (usually the hot fluid) What you want to take out of the primary circuit (Heat dissipation or a target outlet temperature) Secondary circuit fluid type, temperature and flow rate (usually the coolant) 2. Marine Heat Exchangers The operating principles of a marine heat exchanger are the same as a cooler designed for fresh water use, the main consideration for the designer however is that the marine heat exchanger must be resilient to erosion or corrosion caused by sea water. This means that materials that come in to contact with the sea water must be suitable, such as 90/10 Cupro-Nickel, 70/30 Cupro-Nickel, Bronze and Titanium. There are other factors which need to be taken in to consideration when a marine heat exchanger is being designed. One is the velocity, if it is too low then there i...

What is a Heat Exchanger ? 1. What is a Heat Exchanger? Put simply, a heat exchanger is a device which transfers heat from one medium to another, a Hydraulic Oil Cooler or example will remove heat from hot oil by using cold water or air. Alternatively a Swimming Pool Heat Exchanger uses hot water from a boiler or solar heated water circuit to heat the pool water. Heat is transferred by conduction through the exchanger materials which separate the mediums being used. A shell and tube heat exchanger passes fluids through and over tubes, where as an air cooled heat exchanger passes cool air through a core of fins to cool a liquid. 2. What types of Heat Exchanger are available? There are many different types of heat exchanger available, the three main types that Thermex supplies are; Shell and Tube Heat Exchangers consist of a large number of small tubes which are located within a cylindrical shell. The tubes are positioned into the cylinder using a tube bundle or “...

The thermal energy is transformed to the kinetic energy as steam of high pressure-high temperature rotates steam turbine. Turbine Cooling Air Cooler is used to chill heated gas turbine for maintaining stabilized temperature. http://www.dh.co.kr/turbine-cooling-air-cooler/

Gas Turbine Air Heater & Cooler is a heat-exchanger that heats/or chills in-taken air for combustion of gas turbine (the main equipment of the combined cycle power plant). The thermal energy is transformed to the kinetic energy as steam of high pressure-high temperature rotates steam turbine ANSHAN#2 GT AIR HEATER (MHI-T) BAOTOU #1, #2 GT AIR HEATER (MHI-T) UKRAINE #1, #2 GT AIR HEATER (MHI-T) HUNGARY FUNAFERR GT AIR HEATER (MHI-T) QIAN’AN PJT GT AIR HEATER (MHI-T) KRASNODAR RUSSIA GT AIR HEATER (MHI-T) UZBEKISTAN NAVOI GT AIR HEATER (MHI-T) http://www.dh.co.kr/gas-turbine-air-heater-cooler/

This heat-exchanger is used to chill the enclosed circulating cooling water for gas turbine (the main equipment of the combined cycle power plant) around stable temperature.   http://www.dh.co.kr/fuel-gas-heater-cooler/

Inter Cooler is installed at the end of compressor to chill the compressed gas. This heat-exchanger chills the air or gas discharged from compressor in industrial ASU plant or oil & gas plant, and removes moisture accordingly. Consequently, the efficiency of compressor can be improved and energy can be saved. These air or gas is compressed by cooler at the last stage, and then to be cooled to its required temperature after passing through After Cooler. Fuel Gas Heater is used to heat fuel gas for gas turbine [the marine equipment of the combined cycle power plant] up to required temperature. The thermal energy is transformed the kinetic energy as steam of high pressure-high temperature rotates steam turbine. Fuel Gas Heater is a heat-exchange that increases a heat-energy of fuel gas and TEMA ‘BFU’ Type is applied. http://www.dh.co.kr/fuel-gas-heater/

Turbine Cooling Air Cooler and Fuel Gas Heater are combined to reduce the cost and size. And this is the concept of a heat exchanger that uses the air from fans as a heat medium.   http://www.dh.co.kr/combined-typetcacfgh/

After Cooler is installed at the end of compressor to chill the compressed gas. This heat-exchanger chills the air or gas discharged from compressor in industrial ASU plant or oil & gas plant, and removes moisture accordingly. Consequently, the efficiency of compressor can be improved and energy can be saved. These air or gas is compressed by cooler at last stage, and then to be cooled to its required temperature after passing through After Cooler. . The allowable pressure drop is very limited, and demister is installed inside to remove moistures. Also, for increasing efficiency of heat-exchanger, the Plate Fin type or High Fin type is applied to where air or gas is being taken or discharged. <Advantage of Continuous Plate Fin Type Heat Exchanger> (1) Compact & Cost Competitive Design (2) Vibration Free Design (3) Easy Bundle Removable & Maintenance Design <Advantage of High Fin Type> (1) Wide tube&Fin material combin...

Inter Cooler is installed at the end of compressor to chill the compressed gas. This heat-exchanger chills the air or gas discharged from compressor in industrial ASU plant or oil & gas plant, and removes moisture accordingly. Consequently, the efficiency of compressor can be improved and energy can be saved. These air or gas is compressed by cooler at the last stage, and then to be cooled to its required temperature after passing through After Cooler. http://www.dh.co.kr/bare-tube-type-inter-cooler/

Surface condenser generates vacuum backpressure to ensure output of turbine, and also condenses a waste-steam while located at the end of steam turbine which is generally used in industries such as power generating in power plant, compressing in chemical plant as well as propelling of LNG tanker. The produced condensate is going to be re-circulated towards boiler passing through feed water pump, feed-water heater and deaerator. Depends on location of surface condenser against turbine, it is classified into Top-entry type and Side-entry type. The circular type surface condenser is used for small size and medium size while square type surface condenser is used for large size such as power plant. The function of surface condenser is to maintain back pressure & the power of turbine for generator driver, compressor driver and propulsion of LNG carrier while exhausted steam from turbine is condensed. The condensed feed water in surface condenser is recir...

Lube Oil Cooler is used to chill lubricant oil that used for lubrication process of various rotating equipments such as generator and compressor in plant, by using cooling water. Also, 3-way valve is adopted for timely replacement of Working Cooler and Stand-by Cooler. Generally, it is manufactured in Shell & Tube type, but Plate-type is also available.   http://www.dh.co.kr/lube-oil-cooler/

Gland Condenser is used to collect condensate and calories of steam that used for sealing steam turbine, and it also creates a state of vacuum to help discharge of steam. The thermal energy is transformed to the kinetic energy as steam of high pressure-high temperature rotates steam turbine. Thus, Seal Steam System is necessary to prevent steam leakage from steam turbine and air infiltration into steam turbine. Gland Condenser collects condensate and steam calories as well as creation of vacuum state inside of Seal Steam System, and it also steam discharge. http://www.dh.co.kr/gland-condenser/

Ejector Condenser is a combination of Ejector which constantly ejects air to maintain a state of vacuum inside of Vacuum Steam Condenser, by using steam, and condenser which condensing and re-circulates the used steam. If air infiltrates into Vacuum Steam Condenser for Steam Turbine, it wraps surface of tube and subsequently, the heat-transfer efficiency drops and vacuum state of Surface Condenser is released. Consequently, the efficiency of turbine falls down. Therefore, Steam Ejector is used to eject air from Condenser, and Surface condenser is used to collect discharging steam accompanied with air, by using cooling water. For the reuse and efficiency, this condensate is mainly turned back to Surface Condenser through steam strap. Generally, Ejector Vacuum System is comprised of first stage Ejector and middle Surface Condenser, and second stage Ejector and final Surface Condenser. Since any rotating instrument is not included, it has advant...

The Oil-tanker is designed for the bulk transportation of crude oil or petro-chemical products, and broadly there are two types of tankers, Product carrier and Crude oil carrier. In case of Product Carrier, every compartment shall be cleaned because different kinds of consignments are being stored in, otherwise they could contaminate each other. The remaining oil and oil sludge inside of oil tanker also shall be removed after unloading, because other kinds of oil might be stored in. For this work, S.W or F.W is needed to be heated above 70 ~ 80 ℃, by using Tank Cleaning Heater. http://ift.tt/2kAuk2A from www.dh.co.kr

Plate Type Heat Exchanger Plate Cooler is a typical heat-exchanger that uses wrinkled-thin metal plates to transfer heat between two fluids. Large commercial version uses gaskets between the metal plates, and this cooler can exchange large amount of heat in short period of time. Since the wrinkled heat transfer plate easily creates turbulence flow at low Reynolds number, the heat transfer co-efficient between two fluids is greater than 2~4 times than typical Tubular type heat-Exchanger, and its counter flow can also increase the heat-exchange rate. Moreover, the Plate Type Heat Exchanger is an ideal heat-exchanger because the temperature approach in a plate cooler may be as low as 1°C whereas tubular type requires an approach of 4°C or more. Therefore, it is enough to cool down main engine, generator engine and other auxiliary machines of the ship. Working Principle Gasket is attached to the heat plate which forms flow channel and acts seal up ...

Oil Heater is used to heat a fuel oil and lubricant oil for ships by using the steam generated from boiler. There are several type of oil heaters in the market: M/E & G/E F.O. Heater breaks the viscosity of fuel oil, while increase inflammable point; H.F.O. Purifier Heater breaks the viscosity of fuel oil of heavy fuel oil, and also increases oil temperature up to the degree which helps purification process. ; and L.O. Purifier Heater increases oil temperature up to the degree which helps purification of lubricant oil used in engine. http://ift.tt/2kAw5N7 from www.dh.co.kr

Since its foundation in 1980, DongHwa Entec has been successfully developed and manufactured the air cooler for both low speed and high speed engine for more than 20 years. Subsequently, DongHwa Entec has grown up into the global leader of air cooler market with taking 50% of market share. One of our products, Charged Air Cooler is used to raise temperature of compressed air which in-taken through Turbo Charger, in order to improve power and efficiency of diesel engine. And it is comprised of Fin & Tube, Tube sheet, Casting and Water Chamber. MARPOL 73/78 Annex VI , Regulation 14.Operation in Sulphur oxides (SOx) Emission Control Area, How to comply,  LOADNew and tighter fuel sulphur content regulations by the EU and the California Air Resources Board, MGO Cooling Unit for the solution is applied as follows;  Table : Fuel requirements for Ocean-Going Vessel Main Diesel Engines, Auxiliary Diesel Engines ( Including Diesel-Electric ), and Auxiliary Boil...

B.O.G(Boil-off gas) is generated while LNG is being transported, and this gas is utilized as fuel in steam turbine for sailing of LNG Carrier. Therefore, water-feeding shall be maintained very strictly on LNG Carrier. Meanwhile, the general-purpose-steam is supplied from the main boiler, and utilized to operate various auxiliary components of the ship. However, if those auxiliary component are defaulted or being operated incorrectly, feed-water could be mixed with boiler water, and eventually the life-time of boiler could be shorten. In this reason, the steam for mail boiler and general-purpose-steam are separated. LNG RV/FSRU Regasfication System Sea water direct heating  Combined open/closed loop with seawater and steam heating Min. equipment Control simple Min. Energy consumption High pressure vaporizer : Shell and Tube type heat exchanger http://ift.tt/2kAzXOm from www.dh.co.kr

LNG that is being supplied from RV/FSRU(combination of LNG Tanker, Re-gasification facility and Gas unloading facility) by HP LNG Pump, is vaporized by HP Vaporizer. The seawater is utilized as a source of heat that vaporizes LNG, and also if the seawater temperature falls down, it will be heated by with Seawater Heating System. In such case, DongHwa Entec’s Seawater Heater may be used. LNG RV/FSRU Regasfication System Sea water direct heating  Combined open/closed loop with seawater and steam heating Min. equipment Control simple Min. Energy consumption High pressure vaporizer : Shell and Tube type heat exchanger http://ift.tt/2lTfsgA from www.dh.co.kr

In order to protect body of the ship from extremely cold LNG Cargo, the Glycol Water (45% Glycol Water + 55% Fresh Water) is heated up to temperature of 90°C, and then circulated through Heating Coil that installed in temporary water-board between cargos. The Glycol Water Heater is used to heat Glycol water, and Glycol system is comprised of Glycol Water Heater and Pump, Tank. http://ift.tt/2lTjE0a from www.dh.co.kr

Fuel Switch Fuel Switch is an automatic control system for bunker change process. Recently, shipbuilding trends shifts towards the intelligent ship and consideration of sailor’s convenience and also, safety system of ship is emphasized. For this reason, Fuel Switch of DongHwa Entec is designed to control temperature changes [2℃/min] that is resulted from bunker change between HFO in high temperature and MGO/MDO in ordinary temperature, with consideration of safety. Consequently, risk of damage on engine can be mitigated and convenience of sailors has increased through automatic control instead of manual valve operation. Moreover, the remote system with HMI(ECR & LOCAL) enables sailors to control under the any circumstance. Also, it provides a real-time monitoring system over the entire bunker change process. Especially, it has an advantage of composite control over the entire bunker change process, in connection with MGO cooling unit. Donghwa total solution [MGO C/U + FUEL SW...

Fuel Gas Supply System System configuration Fuel Gas Supply System(FGSS) is used to supply a fuel gas to ME-GI engine. The high pressure LNG is being supplied by HP liquefied natural gas pump and then, vaporized to natural gas. Glycol Water is generally used to heat-source for vaporizing liquefied natural gas, and Glycol Heating System is accompanied including Glycol Tank and Glycol Pump. Main fuel supply system package unit for both high pressure 2 stroke engine and low pressure 4 stroke generator engines IHM(intermediate Heat Medium) Heater package unit IHM Tank Container of IHM(50% Glycol + 50% water) IHM Pump Circulate the IHM from the LNG vaporizer to the IHM heater IHM Heater Heating IHM using steam with automatic temperature control Vaporizer package unit For 2 stroke high pressure main dual fuel engine • High pressure vaporizer Vaporization of high pressure super-critical LNG to the main engine For 4 stroke low pressure generator engines • Forcing vaporizer...

Fresh Water Generator Fresh Water Generator is used to desalinate seawater for the ships. There are two types fresh water generator, R/O type and Low-pressure vapor type. Low-pressure vapor type is most widely used in commercial ships because it utilizes wasted engine jacket water or steam while sailing. The engine jacket water and steam can be utilized as a heat-source, and Shell & Tube type and Plate type are available. The seawater is heated by various heat-sources under the vacuum state, and then vaporized accordingly. The vaporized seawater is desalinated in separate filtering unit before condensed, and then fresh water is produced. Meanwhile, a salinity of produced fresh water shall remain at 0~10 ppm . Fresh Water Generator is comprised of vaporizer, condenser, demister, salinometer, distillate pump, ejector and steam injector. Multi-stage Fresh Water Generator can achieve high efficiency when large amount of fresh water is required with small amount of calories due to...

Energy Saving System Recently, efforts of the various aspects and regulations for sailing ships to reduce the CO2 have been established. IMO MEPC 203 (62) meeting mentioned Energy Efficiency Design Index (EEDI) for new ships and a Ship Energy Efficiency Management Plan (SEEMP) through MARPOL Annex VI Regulation, and the raising energy efficiency is becoming inevitable.In the vessel, there are many products that can enhance the energy efficiency depending on the environment conditions.Among them, ESS is a product to reduce total power consumption by controlling pump of S.W., F.W., E / R ventilation fan and cargo hold fan.Therefore, how much energy can be reduced by ESS?Surprisingly by reducing the motor RPM of 10% through the ESS, 27% of power consumption is saving.As result of this, you can significantly save fuel Oil of D/G unnecessarily consuming on the ship. http://ift.tt/2lTjCFA from www.dh.co.kr

In order to maximize operation efficiency of main engine and other components (Aux. Engine, Purifier etc) of the ship, the Electric Heater is used to electrically heat various fluids such as lubricant oil and fuel oil. Electric heater is used to increase temperature of fluid up to required degree by heating, and it consists of heating section and control panel. Generally, the fuel oil, lubricant oil, jacket water and sea water are used with Electric Heater, and Shell body type and Tank mounting type are available. Within Tank mounting type, Side type is attached to side of tank while Top mounting type is attached to top of tank. The in-taken fluid is heated by the heating section of Electric Heater, and then heated fluid is discharged. For the control of this process, two different types of control systems are available, MC type and TPR type. MC type is an on-off step control type, and it can allocate capacity as much as needed. Meanwhile, TPR type is an electric current control type...

The heat generated by boiler may be used in various components of the ship, but if the remaining heat has not transformed into condensate, it may disable pump to transport fluid, and subsequently, re-use is not possible. Therefore, the remaining steam is needed to be cooled and then reused as feed-water. Drain Cooler enables reuse of dumping steam and steam generated from various auxiliary components as well as saturated water through condensation. http://ift.tt/2lTlxdb from www.dh.co.kr

Deaerator is used to remove gas (oxygen, carbon dioxide) from feed-water for preventing corrosion inside of piping and heat-exchanger. At the same time, it can be utilized to heat feed-water, and maintain stable NPSH (Net Positive Suction Head) of feed-pump. Spray & Tray type is generally used in onshore plants while Spray & Scrubber type is applied to the ships. DongHwa Entec is developing and testing Spray, Tray and Scrubber type deaerator, and distributing them to market. Moreover, research and development are still going on for further improvement of their performances. We can meet any requirement from customer, over the whole process including performance design, strength design, material procurement, manufacturing and delivery. LNGC FOR DW2205(SCRUBBER TYPE) DAEJUN INDUSTRIAL COMPLEX #3,4(STEAM CONVERTOR) LG CALTAX COGENERATION #3 ICHON TOTAL ENERGY NO. 2 MHI/CHYODA PROJECT SAMSUNG ENG./DAINONG PJT http://ift.tt/2lk1iJ2 from www.dh.co.k...

With most of oil tankers, the steam is used to run a pump attached to turbine when the cargo oil is being loaded. The vacuum condenser is installed to generate back-pressure for improving turbine performance, and recollecting exhaust steam. Additionally, it can be used to recollect steam that discharged from tanker ship with inert gas system. Generally, the high efficiency ejector or vacuum pump unit is attached to vacuum condenser in order to eject non-condensable gas. http://ift.tt/2lk9GIi from www.dh.co.kr

Cargo Drain Cooler enables the re-use of feed-water by condensing saturated water which being used in LNG tanker system equipment (Condensation line of LNG vaporizer, Forcing vaporizer, Boil off/warm-up heater, etc). from www.dh.co.kr

Since its foundation in 1980, DongHwa Entec has been successfully developed and manufactured the air cooler for both low speed and high speed engine for more than 20 years. Subsequently, DongHwa Entec has grown up into the global leader of air cooler market with taking 50% of market share. One of our products, Charged Air Cooler is used to raise temperature of compressed air which in-taken through Turbo Charger, in order to improve power and efficiency of diesel engine. And it is comprised of Fin & Tube, Tube sheet, Casting and Water Chamber.    Material Tube sheet :Naval Brass, Carbon Steel Tube :Cu-Ni (ø12.0×1.0t, ø14.0×0.8t, ø14.0×1.0t,ø16.0×0.8t) Fin : Copper Standard Size for B&W Cooler Insert TYPE A B C D E F LKM-©A 1425 1307 255.5 2302 2500.5 2756 LKM-©B 1425 1307 255.5 1937 2135.5 2391 LKM-©C 1425 1307 255.5 1614 1812.5 2608 LKM-©D 1111 992 225.5 1937 2090 2316 LKM-©E 1111 992 225.5 1614 1767.5 1993 LKM-©F 1111 992 225.5 1292 1445....