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Thermal power generation system and thermal energy device and flue gas waste heat utilization device thereof

A flue gas waste heat and thermal energy technology, applied in preheating, steam generation, liquid degassing, etc., can solve the problem of low flue gas waste heat recovery and utilization efficiency, and achieve the effect of improving efficiency

Inactive Publication Date: 2017-07-07
CHINA ENERGY ENG GRP GUANGDONG ELECTRIC POWER DESIGN INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Based on this, it is necessary to provide a thermal power generation system and its thermal energy device, and a flue gas waste heat utilization device in view of the low efficiency of the existing flue gas waste heat recovery and utilization

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  • Thermal power generation system and thermal energy device and flue gas waste heat utilization device thereof

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Embodiment Construction

[0023] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The drawings show preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0024] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or a central element may also exist. When an element is considered to be "connected" to another element, it can be directly connected to the other element or an intermediate element may be present at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustr...

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Abstract

The invention relates to a thermal power generation system and a thermal energy device and a flue gas waste heat utilization device thereof. The flue gas waste heat utilization device comprises a first economizer communicating with a waste gas port of a boiler, a second economizer communicating with the first economizer and an air heater communicating with an air preheater. The first economizer conducts heat exchange with flue gas through a condensation water loop, and part of waste heat in the flue gas can be used for working of a steam turbine. Furthermore, the second economizer is matched with the air heater, and part of 'low grade waste heat' cannot be utilized by the first economizer in the flue gas is transformed into 'high grade heat' through a heat exchange loop for heating air entering the air preheater, so that heat entering into the boiler is increased. Meanwhile, the part of waste heat raises the temperature of the boiler flue gas after entering into the boiler, so that the first economizer can use more waste heat to work on the steam turbine. Therefore, through the heat exchange loop, the heat in the flue gas can be recycled, and the efficiency of flue gas waste heat recovery and utilization is effectively improved.

Description

Technical field [0001] The invention relates to the technical field of environmental protection and energy saving, in particular to a thermal power generation system and its thermal energy device, and a flue gas waste heat utilization device. Background technique [0002] Among the various heat losses of power plant boilers, the heat loss caused by exhaust fumes accounts for more than 50% of the total heat loss of the boiler, and the heat taken away by exhaust fumes can reach 3% to 8% of the calorific value of the entire fuel input of the power plant. Therefore, as energy prices continue to rise and the policy requirements for energy conservation and emission reduction become more stringent, it is imperative to seek effective waste heat utilization. [0003] At present, most power plants have modified and designed the use of flue gas waste heat, and they generally adopt low-temperature economizers to realize the utilization of flue gas waste heat. By installing one or two-stage lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22D1/32F22D1/50F23J15/02F23J15/06
CPCF22D1/32F22D1/50F23J15/02F23J15/022F23J15/06F23J2215/20F23J2217/102Y02E20/30
Inventor 段玉燕王正峰
Owner CHINA ENERGY ENG GRP GUANGDONG ELECTRIC POWER DESIGN INST CO LTD
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