Power Plant Industry
Plate heat exchangers are an essential component in the efficient functioning of many industrial processes, including power plants. HFM has a wealth of experience in designing and implementing plate heat exchangers in various applications, including closed-loop circulating water systems, oil cooling systems, and power plant heat exchanger systems.
HFM’s expertise in power plant heat exchanger technology has led to the development of efficient heat exchange solutions that optimize the energy utilization of power plants. The plate heat exchanger for power plants solution proposed by HFM ensures maximum heat transfer efficiency, resulting in improved power plant performance and reduced energy consumption.
Power Plant Heat Exchanger System – Blast Furnace Gas Combined
In order to achieve the goals of energy conservation and environmental protection by decreasing coal gas emissions, one can utilize blast furnace gas combined cycle power generation equipment for recycling the gas from power plants.
The waste heat steam, which is produced during the process of steam turbine power generation in the power plant, can be cooled down through a plate heat exchanger and then transferred to a waste heat boiler through a feed pump. After the steam is generated, it can be sent to the steam turbine for electricity generation, which allows for water to circulate.
To meet the necessary conditions, Hofmann plate heat exchangers are recommended due to their compact structure, small size, high heat transfer coefficient, and efficient heat transfer characteristics, making them the most suitable option in power plant heat exchanger systems.
Process Flow Diagram of Thermal Power Plant
In a power plant, the process starts with the production of steam in the boiler. The steam is then directed to the turbine, which is responsible for rotating the generators to produce electricity. Once the turbine exhausts the steam, it enters the condenser, a cold-end device, where it condenses back into water. The condensate is then transported by the condensate pump back to the boiler, completing the cycle and ensuring the continuous generation of electricity in the power plant.
Process Introduction of Thermal Power Plant
A power plant that runs on coal as its primary energy source uses belt-conveyor technology to transfer pulverized coal to the boiler. The combustion of coal produces steam, which flows into the high-pressure cylinder after being heated. To increase thermal efficiency, the steam is reheated and sent to the intermediate-pressure cylinder to generate electricity through the turbo generator.
Some of the steam is extracted and used by other industries, while the rest is cooled down in the condenser to become recycled water. The recycled water is heated and deoxidized before being sent to the high-pressure heater, where it is heated using reheated steam as fuel and then flows back into the boiler for recycling. This is the basic process of power generation in a coal-based thermal power plant.
Application of Plate Heat Exchanger for Power Plant
In a power plant, the oil cooler for a gasoline engine typically employs a tubular design, with water flowing through the steel pipe and oil flowing within the shell and outside the tube bundle. This facilitates heat exchange between the two fluids through the pipe wall.
A condenser, on the other hand, features numerous copper pipes that cool down exhaust steam from the turbine upon contact with circulating cooling water, releasing latent heat of vaporization. This heat is carried away through the pipe wall and results in condensation water.
High-pressure heaters, which are surface heat exchangers, help to heat up feedwater and boost economic efficiency. They are connected to the high-pressure feed pump and have slim tubes inside that allow for heat transfer between boiler feed water, condensation water, and oil gas extracted from the turbine. This process raises the temperature of the feed water and condensation water while condensing the oil gas into water extraction, which then flows into the high-pressure deaerator.
The low-pressure heater, which is linked to the sealing heater, is used to heat up the condensation water in the high-pressure deaerator, thus improving the overall efficiency of the power plant heat exchanger system.
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Desulfurization System
The plate heat exchanger is a crucial component of power plant heat exchanger system for desulfurization. One such component is the air preheater, which utilizes a rotary and regenerative heat exchanger that operates in a countercurrent fashion.
This system contains heat storage elements with unique corrugations that are placed within fan-shaped rotor chambers. The rotor rotates at a speed of 0.96 rpm, and there are exhaust gas and air channels located on the left and right sides.
The air channel is separated into primary and secondary channels. As exhaust gas flows through the rotor, it releases heat to the heat storage elements, thereby lowering its temperature. The heat storage elements then rotate to the airside and release heat to the air, increasing its temperature. This constant circulation ensures heat exchange between the exhaust gas and air.
Another important component is the slag cooler, which is primarily composed of a double-layer sealing sleeve that is welded with a fixed spiral blade inside the internal cylinder, along with an inlet and outlet slag device, inlet and outlet water device, transmission device, and base system. When the slag cooler rotates slowly, driven by the transmission, high-temperature slag from the boiler is guided forward in the internal cylinder of the sleeve. The cooling water flows in reverse in the jacket between the internal and external cylinder, gradually cooling down the hot slag.
The air cooler in the generator is used to cool down the stator, rotor windings, and stator core. There are typically two cooling modes: open-circuit ventilation and closed cycle. In open-circuit ventilation, the air around the generator is directly used as a cooling medium and comprises an air suction inlet, filter, inlet, outlet muffler, and outlet air channel. The air is suctioned by the fan and sent to the generator’s heating parts for cooling before being exhausted through the outlet muffler and air channel. This mode costs less, but it’s only applicable in clean ambient air conditions with no salt spray and relatively low temperatures.
Otherwise, it may lead to blockages in the channel or corrosion of the metal parts, which can affect safe operation. In contrast, the cooling air of a closed-cycle generator runs in a closed cycle in the cooling system, necessitating the installation of an air-water cooler to take away the heat in the air.
Fans with hydraulic coupling and pumps, such as feed pumps, blowers, and draught fans, are typically supplied with the main equipment. There are numerous applications of coolers in power plants, including furnace sampling, cooling of the wind machine and motor bearing, and oil-cooling mode for equipment like blowers, draught fans, water pumps, and air compressors. Additionally, the oil station generally adopts water-cooling mode, and there are over 20 kinds of central air-conditioning systems.
Other Type of Heat Exchanger
Plate heat exchanger, Tubular heat exchanger, Brazed plate heat exchanger, Displacement heat exchanger, Full-welded heat exchanger, Air heat exchanger.
Presently, the plate heat exchanger is deemed the most efficient option. HFM Power Plant Heat Exchanger strictly adheres to the highest standards of quality and safety, ensuring all of our products meet the rigorous requirements of GRG, FDA, and SGS certifications.
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