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Heat regenerative system adopting jet-type heat pumps

A jet heat pump and heat recovery system technology, which is applied in preheating, feed water heaters, lighting and heating equipment, etc., can solve problems such as the limitation of heat recovery stages, achieve reduction of irreversible losses, obvious benefits of energy saving and emission reduction, and thermal efficiency Improved effect

Active Publication Date: 2012-07-04
XI AN JIAOTONG UNIV
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Problems solved by technology

From a thermodynamic point of view, the more heat recovery stages, the higher the thermal efficiency of the unit. However, due to the constraints of the steam turbine structure and other factors, the increase in the heat recovery stages is limited. Currently, large thermal power units generally use 7-9 stage heat recovery. hot
The regenerative heater of thermal power plant uses steam to heat the feed water, and there is an irreversible loss due to the temperature difference between the steam and the feed water

Method used

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  • Heat regenerative system adopting jet-type heat pumps
  • Heat regenerative system adopting jet-type heat pumps
  • Heat regenerative system adopting jet-type heat pumps

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Embodiment Construction

[0010] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0011] Since the regenerative heater of thermal power plant uses steam to heat the feed water, there is an irreversible loss due to the temperature difference between the steam and the feed water. The greater the temperature difference between steam and feed water, the greater its irreversible loss. figure 2 The temperature-enthalpy diagram of the regenerative heating process is given. It can be seen from the figure that increasing the number of regenerative stages can reduce the temperature difference in the regenerative process, thereby reducing the irreversibility of the regenerative process. loss. However, in reality, limited by factors such as the structure of the steam turbine, currently large coal-fired generating units generally use 7-9 stages of regenerative steam extraction, and the corresponding regenerative heater stages are also 7-9 stages. In...

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Abstract

The invention relates to a heat regenerative system adopting jet-type heat pumps. The heat regenerative system comprises a plurality of levels of heaters which are successively connected, wherein the heater of each level is respectively connected with an extraction steam pipeline of the level, and an indirect heater is arranged between the heaters of every two adjacent levels and is communicated with the heaters of the two adjacent levels; and a jet-type heat pump is arranged between the extraction steam pipelines of the heaters of every two adjacent levels, is communicated with the extraction steam pipelines of the heaters of the two adjacent levels and are corresponding to the indirect heater of the level, and the outlet of each jet-type heat pump is connected with the inlet of each indirect heater. The jet-type heat pumps are arranged in the heat regenerative system provided by the invention, extraction steam with higher pressure is utilized to inject lower-level extraction steam with lower pressure, so that mixed steam the pressure of which is between the pressures of two levels of extraction pressure is generated; and an indirect regenerative heater utilizing the mixed streamas a heating stream source is additionally arranged, thereby reducing the irreversible loss of a regenerative process, and improving the heat efficiency of a machine set.

Description

technical field [0001] The invention relates to a heat recovery system, in particular to a heat recovery system using a jet heat pump. Background technique [0002] Modern large-scale thermal power units all use heat recovery to improve their thermal economy. From a thermodynamic point of view, the more heat recovery stages, the higher the thermal efficiency of the unit. However, due to the constraints of the steam turbine structure and other factors, the increase in the heat recovery stages is limited. Currently, large thermal power units generally use 7-9 stage heat recovery. hot. The regenerative heater of thermal power plant uses steam to heat the feed water, and there is an irreversible loss due to the temperature difference between the steam and the feed water. The greater the temperature difference between steam and feed water, the greater its irreversible loss. Contents of the invention [0003] The purpose of the present invention is to provide a heat recovery ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22D1/32
Inventor 种道彤刘继平严俊杰邢秦安
Owner XI AN JIAOTONG UNIV
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