Heat recovery steam generator
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The document discusses heat recovery steam generators (HRSGs). It provides the following key points: 1) HRSGs consist of four main components - economizer, evaporator, superheater, and water preheater - to convert heat from exhaust gases into steam. 2) HRSGs can be categorized as horizontal or vertical based on exhaust gas flow direction, and single pressure or multi-pressure based on number of steam drums. 3) Packaged HRSGs are pre-assembled units suitable for waste heat or small turbine applications under 20MW. They can include supplemental firing for higher efficiency.
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Heat recovery steam generator
The document discusses heat recovery steam generators (HRSGs). An HRSG uses heat from hot exhaust gases to generate steam. It is composed of an economizer, evaporator, and superheater. The hot exhaust gases pass through these components, reducing in temperature while heating water and generating high-pressure steam. The steam can then be used to drive a steam turbine. The document discusses the components, types, circulation methods, heating surfaces, and other aspects of HRSG design and operation.
Hrsg startup proceudre
This document provides operating procedures for a heat recovery steam generator (HRSG) unit, including:
1) Pre-operating procedures such as cleaning, chemical cleaning, blowing steam lines, setting safety valves, and filling the unit before cold startup.
2) Cold startup procedures such as adjusting water levels, purging the unit, gradually warming it up and introducing supplementary firing.
3) Guidelines for normal shutdown including stopping supplementary firing and slowly reducing gas flow and pressure.
4) Emergency procedures for low or high water levels and tube failures.
5) A walkdown checklist to inspect for leaks or abnormal conditions.
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Feedwater heaters are used in steam power plants to pre-heat water delivered to boilers. They work by using extracted steam from turbine stages to gradually heat feedwater up to saturation temperature. This improves efficiency by reducing costs and preventing thermal shock to boiler metal. Feedwater heaters come in open and closed designs, with open designs mixing extracted steam directly into feedwater and closed using heat exchangers. Their use recovers some energy from steam and optimizes the balance between extracted steam and turbine power output.
287649737 90325-presentation-hrsg
The document discusses Heat Recovery Steam Generators (HRSGs). HRSGs recover heat from gas turbine exhaust to produce steam. They operate in either combined cycle mode, where steam drives a turbine, or cogeneration mode where steam is used for industrial processes. HRSGs contain evaporator, economizer, and superheater sections to produce steam. They can also include reheaters, deaerators, and preheaters. HRSGs come in natural circulation, forced circulation, or once-through designs and can be unfired, fired, supplementary fired, or exhaust fired depending on heat input. HRSGs vary in operation pressure as either single or multi-pressure. Post-combustion emission controls like
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La recupercion de Energia termica que eliminan los gases de escape a la atmotfera de las turbinas o generadores de combustion interna. Pueden ser aprovechadas para producir vapor de media presion y ser utilizadas en la industria. La cogeneracion es una importante alternativa para generar grandes ahorros de combustible. Te invito a investigar y tomar las mejores decisiones para tus proyectos de ahorro energetico.
HRSG,S knowledge
The document defines an HRSG as being composed of an economizer, evaporator, and superheater. As hot exhaust gas passes through these components, its temperature reduces from 550°C to 130°C, heating and converting water into steam. The economizer heats water up to near saturation temperature, while the evaporator heats water into saturated steam. The superheater then heats saturated steam into superheated steam. The deaerator system uses thermal and chemical processes to remove oxygen from water, which is then fed into boiler systems. A preheater is sometimes used to heat condensate water closer to saturation temperature before entering the deaerator.
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Heat recovery steam generator
The document discusses heat recovery steam generators (HRSGs). An HRSG uses heat from hot exhaust gases to generate steam. It is composed of an economizer, evaporator, and superheater. The hot exhaust gases pass through these components, reducing in temperature while heating water and generating high-pressure steam. The steam can then be used to drive a steam turbine. The document discusses the components, types, circulation methods, heating surfaces, and other aspects of HRSG design and operation.
Hrsg startup proceudre
This document provides operating procedures for a heat recovery steam generator (HRSG) unit, including:
1) Pre-operating procedures such as cleaning, chemical cleaning, blowing steam lines, setting safety valves, and filling the unit before cold startup.
2) Cold startup procedures such as adjusting water levels, purging the unit, gradually warming it up and introducing supplementary firing.
3) Guidelines for normal shutdown including stopping supplementary firing and slowly reducing gas flow and pressure.
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The document discusses Heat Recovery Steam Generators (HRSGs). HRSGs recover heat from gas turbine exhaust to produce steam. They operate in either combined cycle mode, where steam drives a turbine, or cogeneration mode where steam is used for industrial processes. HRSGs contain evaporator, economizer, and superheater sections to produce steam. They can also include reheaters, deaerators, and preheaters. HRSGs come in natural circulation, forced circulation, or once-through designs and can be unfired, fired, supplementary fired, or exhaust fired depending on heat input. HRSGs vary in operation pressure as either single or multi-pressure. Post-combustion emission controls like
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- Advantages include reduced irreversibility in steam generation and avoiding thermal shock to boiler metal.
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The document defines an HRSG as being composed of an economizer, evaporator, and superheater. As hot exhaust gas passes through these components, its temperature reduces from 550°C to 130°C, heating and converting water into steam. The economizer heats water up to near saturation temperature, while the evaporator heats water into saturated steam. The superheater then heats saturated steam into superheated steam. The deaerator system uses thermal and chemical processes to remove oxygen from water, which is then fed into boiler systems. A preheater is sometimes used to heat condensate water closer to saturation temperature before entering the deaerator.
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Heat recovery steam generator
- 1. HEAT RECOVERY STEAM GENERATOR HRSGs consist of four major components: theeconomizer, evaporator, superheater and water preheater. The different components are put together to meet the operating requirements of the unit. See the attached illustration of a Modular HRSG General Arrangement. Modular HRSGs can be categorized by a number of ways such as direction of exhaust gases flow or number of pressure levels. Based on the flow of exhaust gases, HRSGs are categorized into vertical and horizontal types. In horizontal type HRSGs, exhaust gas flows horizontally over vertical tubes whereas in vertical type HRSGs, exhaust gas flow vertically over horizontal tubes. Based on pressure levels, HRSGs can be categorized into single pressure and multi pressure. Single pressure HRSGs have only onesteam drum and steam is generated at single pressure level whereas multi pressure HRSGs employ two (double pressure) or three (triple pressure) steam drums. As such triple pressure HRSGs consist of three sections: an LP (low pressure) section, a reheat/IP (intermediate pressure) section, and an HP (high pressure) section. Each section has a steam drum and anevaporator section where water is converted to steam. This steam then passes through superheaters to raise the temperature beyond the one at the saturation point. Packaged HRSGs Packaged HRSGs are designed to be shipped as a fully assembled unit from the factory. They can be used in waste heat or turbine (usually under 20 MW) applications. The packaged HRSG can have a water-cooled furnace, which allows for higher supplemental firing and better overall efficiency. Variations Some HRSGs include supplemental, or duct firing. These additional burners provide additional energy to the HRSG, which produces more steam and hence increases the output of the steam turbine. Generally, duct firing provides electrical output at lower capital cost. It is therefore often utilized for peaking operations. HRSGs can also have diverter valves to regulate the inlet flow into the HRSG. This allows the gas turbine to continue to operate when there is no steam demand or if the HRSG needs to be taken offline. Emissions controls may also be located in the HRSG. Some may contain a Selective Catalytic Reduction system to reduce nitrogen oxides (a large contributor to the formation of smog and acid rain) and/or a catalyst to remove carbon monoxide. The inclusion of an SCR dramatically affects the layout of the HRSG. NOx catalyst performs best in temperatures between 650 °F (340 °C) and 750 °F (400 °C). This usually means that the evaporator section of the HRSG will have to be split and the SCR placed in between the two sections. Some low temperature NOx
- 2. catalysts have recently come to market that allows for the SCR to be placed between the Evaporator and Economizer sections (350 °F - 500 °F (175 °C - 260 °C)). Working principle HRSG is originated and developed from the conventional boiler and heat exchanger. In terms of construction, it can be divided into flue gas type and shell & tube type. The flue gas HRSG is similar to the conventional boiler: the hot fluid in the furnace heats the tube bundle to create high-temperature steam or hot water. Shell & tube HRSG is similar to shell and tube heat exchanger: the hot fluid can move through either tube or shell and the heat will be transferred between the hot and cold fluids through shell wall. Characteristics (1) It is capable of running under pressure. (2) Strong intensity of heat transfer. In order to prevent the fluid from further reaction. It requires that the temperature of fluid should be dropped down as soon as possible. (3) Controllable outlet temperature. In some industrial applications, due to the high temperature of dew point of fluid as well as its strong corrosivity, the outlet temperature should be under control to keep above the rated value for avoiding corrosiveness. (4) Strong wear resistance. A special design can improve the wear resistance of heat pipe bundle to ensure a long-term safe operation.