Exhaust steam waste heat recycling system for small steam turbine of induced draft fan through circulating water based on steam turbine driving

A technology for small steam turbines and induced draft fans, which is applied in steam engine installations, machines/engines, steam applications, etc., can solve the problems of reduced economic efficiency, reduced main steam turbine work, and exhaust heat loss of induced draft fan steam turbines, and achieves reduction in civil engineering volume. The effect of small size, height reduction and project cost reduction

Inactive Publication Date: 2015-09-30
宋子琛
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, if the steam turbine of the induced draft fan in the prior art adopts the condensing type, the heat taken away by the circulating water cannot be utilized, resulting in the heat loss of the exhaust steam

Method used

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  • Exhaust steam waste heat recycling system for small steam turbine of induced draft fan through circulating water based on steam turbine driving

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0019] Example 1 (application of new coal-fired power plant)

[0020] The induced draft fan has a large capacity and is driven by steam power. In order to facilitate starting, an electric start induced draft fan with a capacity of 30-50% is set at the same time; the primary fan 3 and the blower 2 are electrically driven. When the load of the standby unit rises to 30-50% of the load, the induced draft fan switches to the small steam turbine drive, and the exhaust heat of the small steam turbine 1 of the induced draft fan heats the primary air and supply air through the indirect cooling heat exchange system, and recovers this part of the exhaust heat.

[0021] After the waste heat of the induced draft fan steam turbine 1 heats the primary air 3 and the supply air 2, the exhaust gas temperature of the boiler air preheater 4 will inevitably rise. In order to reduce the exhaust gas temperature of the air preheater 4, the bypass feed water heat exchanger 62 and the condensate water ...

Example Embodiment

[0024] Example 2 (application to expansion of coal-fired power plants)

[0025] Since there is external auxiliary steam, only the steam-driven induced draft fan can be installed, and the electric-started induced draft fan can be removed, and the steam-driven induced draft fan can be started directly when the unit starts.

[0026] When recovering the waste heat of the small steam turbine, the induced draft fan small steam turbine 1 exhausts the steam to the small steam condenser 51, and the condensed water flows into the heat exchanger 52 through the circulating water pipeline 7 through the circulating pump 54 to heat the primary air and send it to the heat exchanger 52. The circulating pump provides circulating power, and the primary air adjusts the heat exchange by adjusting the opening degree of the primary air heat exchange regulating valve 53 according to the actual demand of the system; the supply air recovers most of the heat from the exhaust heat.

[0027] When recoveri...

Example Embodiment

[0028] Example 3 (application of technical transformation of in-service air-cooled units)

[0029] For wet-cooled units in service, there have been examples in China of changing the induced draft fan from the motor drive to the small steam turbine drive, in order to reduce the power consumption rate of the plant and increase the power transmission to the power grid. However, for air-cooled units, due to the limitation of air-cooling island capacity and site, it is impossible to use the existing air-cooling island margin or build a new induced draft fan air-cooling island.

[0030] However, the waste heat of the exhaust steam of the small steam turbine 1 of the induced draft fan is led to the heat exchanger 52 of the primary air 3 and the supply air 2 through the indirect cooling heat exchange system. , the induced draft fan can be driven by electric to steam turbine. At the same time, it has high energy-saving and power saving functions, and increases the power transmission t...

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PUM

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Abstract

The invention discloses an exhaust steam waste heat recycling system for a small steam turbine of an induced draft fan through circulating water based on steam turbine driving. An indirect cooling and heat exchange system of the exhaust steam waste heat recycling system is composed of a small turbine condenser, a heat exchanger, a primary air heat exchanger regulating valve, a circulating pump and a main machine condenser. An air pre-heater part exhaust gas heat recycling system is composed of an air pre-heater bypass system, a water supply system and a condensed water system. The small steam turbine exhausts steam into the small turbine condenser, and condensed water generated through condensation of the circulating water which is subjected to indirect cooling and heat exchange is discharged into the main machine condenser. The indirect cooling and heat exchange circulating water absorbs the steam exhaust heat of the small turbine condenser, the circulating pump is used for conducting forced circulation, and the heat exchanger is used for heating primary air and supply air. The circulating pump provides circulating power. An air supply system absorbs most of the steam exhaust heat of the small steam turbine. The primary air system can regulate the heat exchange amount by regulating the opening degree of a baffle according to the actual demand of the system. The exhaust steam waste heat recycling system can replace a primary air and air supply steam air heater which is generally arranged in a north power plant, and the circulating water is used for recycling the exhaust steam waste heat of the small steam turbine of the induced draft fan driven by the steam turbine.

Description

technical field [0001] The invention belongs to the technical field of energy saving, and in particular relates to a system for recovering waste heat from exhaust steam based on circulating water of a small steam turbine driven by a steam-driven induced draft fan. Background technique [0002] The use of small steam turbines to drive induced draft fans in coal-fired power plants is a technology adopted in recent years to save power consumption. There are currently two schemes for the induced draft fan to be driven by a steam turbine. One is the pure condensing steam scheme. The source is taken from the boiler cold re-export header, and the exhaust steam heat can be used for industrial loads, for heating deaerators or for heating condensed water and feed water. In order to prevent low-temperature corrosion of the boiler air preheater, the outlet of the primary fan and the outlet of the blower in the Northern Power Plant are required to install an air heater, and the steam so...

Claims

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Application Information

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IPC IPC(8): F01D15/08F01K17/02F23L15/00
CPCY02E20/34
Inventor 宋子琛
Owner 宋子琛
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