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...