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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

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 of the induced draft fan turbine
The main steam turbine is used to extract steam to heat the primary air and supply air, resulting in a reduction in the work of the main steam turbine and a reduction in economic efficiency

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

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Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0020] The induced draft fan has a large capacity and is driven by steam. For the convenience of starting, an electric start-up induced draft fan with a capacity of 30-50% is set at the same time; the primary fan 3 and the blower fan 2 are electrically driven. When the load of the standby unit rises to 30-50% load, the induced draft fan is switched to the small steam turbine for driving, and the exhaust steam heat of the induced draft fan small steam turbine 1 is heated by the indirect cooling heat exchange system to heat the primary air and the supply air, and recover this part of the exhaust steam heat.

[0021] After the primary air 3 and the supply air 2 are heated by the waste heat of the induced draft fan steam turbine 1, 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, a bypass feed water heat exchanger 62 a...

Embodiment 2

[0024] Embodiment two (applying to the expansion coal-fired power plant)

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

[0026] When recovering the waste heat of the small steam turbine, the exhaust steam of the small steam turbine 1 of the induced draft fan is discharged to the small machine condenser 51, and the condensed water flows into the heat exchanger 52 through the circulating water pipe 7 and the circulating pump 54 to heat the primary air and send Wind; the circulating pump provides circulating power, and the primary air is adjusted according to the actual needs of the system by adjusting the opening of the primary air heat exchange regulating valve 53 to adjust the heat transfer; the air supply recovers most of the heat from the waste heat of the exhaust stea...

Embodiment 3

[0028] Embodiment 3 (Application to technical transformation of in-service air-cooling units)

[0029] For wet-cooled in-service units, there have been examples in China of changing the induced draft fan from electric motor drive to small steam turbine drive. The purpose is to reduce the power consumption rate of the plant and increase the power transmission to the grid. However, for air-cooled units, due to the limited capacity of the air-cooled island and site constraints, it is impossible to use the existing air-cooled island margin or build a new induced draft fan air-cooled island. At present, there is no case of changing the induced draft fan to steam for domestic air-cooled units in service.

[0030] However, the exhaust heat 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 air supply 2 through the indirect cooling heat exchange system, which is to use the fan heat exchanger 52 as an air-cooling device and...

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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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