Steam secondary reheating system

A secondary reheating and steam technology, applied in the field of electric power equipment, can solve the problems of poor investment income, low steam density, and high pipeline cost of the secondary reheating system, and achieve good technical economy of investment income, high thermal cycle efficiency, The effect of improving pipeline efficiency

Inactive Publication Date: 2012-06-06
CHINA POWER ENG CONSULTING GRP CORP EAST CHINA ELECTRIC POWER DESIGN INST
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Problems solved by technology

[0004] A main factor for the high cost of the secondary reheat system of conventional boilers is the low pressure, high temperature, low steam density, and large volume flow of the second-stage reheating of the flue gas-steam heat exchange. Not only the second-stage reheating heating surface of the boiler Large, medium-pressure cylinder for second-stage reheating of the steam turbine has a large flow volume and high equipment cost, and the corresponding requirements for the second-stage reheatin

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Embodiment Construction

[0031] Embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0032] figure 1 A conventional primary reheat system of the prior art is schematically shown. figure 2 A conventional double reheat system of the prior art is schematically shown. figure 1 and figure 2 The basic structure of the shown reheat system is similar to that of the present invention, which will be described in detail in the following paragraphs.

[0033] figure 1 The main feature of the conventional primary reheat system shown is that there is only one boiler reheat unit 101 .

[0034] figure 2 The main features of the conventional double reheat system shown are: (1) The primary reheater 202 and the secondary reheater 203 are both arranged inside the boiler 201 . In addition, in figure 2 In the shown secondary reheat system, the secondary reheater 203 is a flue gas-steam heat exchanger. Such as figure 2 As shown, the secondary reheat...

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Abstract

The invention provides a steam secondary heating system. The system comprises a steam turbine and a secondary reheater, wherein the steam turbine comprises a high-pressure cylinder, intermediate-pressure cylinders and a low-pressure cylinder which are connected in sequence; the secondary reheater is arranged on the exterior of a boiler, and is connected with the exhaust port of one intermediate-pressure cylinder of the steam turbine and the air inlet of the other intermediate-pressure cylinder or the low-pressure cylinder of the steam turbine; the secondary reheater produces high-temperature reheated steam, and introduces the high-temperature reheated steam into the other intermediate-pressure cylinder or the low-pressure cylinder. According to the steam secondary reheating system provided by the invention, the investment on the secondary reheating system is greatly reduced while the efficiency is improved, so that the steam secondary reheating system has the advantages of excellent investment income and technique economical efficiency.

Description

technical field [0001] The present invention relates to a kind of electric equipment, especially relates to a kind of novel steam secondary reheating system. Background technique [0002] In conventional thermal power plants, reheat can be used to increase the efficiency of the thermodynamic cycle. Among them, reheating means that the steam that has done part of the work in the steam turbine is led out for reheating, and then led back to the steam turbine to continue to work. Through reasonable reheating, the exhaust humidity can be reduced and the thermal cycle efficiency can be improved. [0003] Generally, more reheating times lead to higher thermal cycle efficiency, but at the same time, the cost is also high. Therefore, most thermal power plants use the boiler primary reheat system, and only a few thermal power plants use the boiler secondary reheat system. [0004] A main factor for the high cost of the secondary reheat system of conventional boilers is the low press...

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Application Information

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IPC IPC(8): F22G1/00F01D15/10
Inventor 申松林林磊叶勇健施刚夜董伦雄陈仁杰
Owner CHINA POWER ENG CONSULTING GRP CORP EAST CHINA ELECTRIC POWER DESIGN INST
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