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Energy-saving recycling system for low-grade heat energy in smoke pollutant treatment of thermal power plant

A technology for pollutant treatment and heat energy recovery, which is applied in the directions of preheating, greenhouse gas reduction, and climate sustainability. , to achieve the effect of reducing energy consumption and operating costs, reducing coal consumption for power generation, and reducing the amount of low-pressure extraction steam

Inactive Publication Date: 2016-05-04
ZHEJIANG ZHENENG ENERGY SAVING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the thermal power unit is operating at full load, but in winter and other climates, the temperature of the exhaust gas flowing out of the air preheater is low or the thermal power unit is not operating at full load, resulting in low exhaust gas temperature and flue gas flowing out of the air preheater. When the flow rate is reduced, because the flue gas outlet temperature of the flue gas cooler and the flue gas reheater needs to be maintained at a state similar to that at full load, the heat obtained by the flue gas cooler cannot meet the needs of the flue gas reheater. Usually, it is necessary to add a certain amount of steam with certain parameters to heat the heat medium water flowing out of the flue gas cooler to ensure that the flue gas temperature at the outlet of the flue gas reheater reaches about 80°C
According to the actual operating experience of thermal power units that have been put into operation, when the load of thermal power units is lower, the amount of supplementary steam is more, and the energy consumption of the ultra-low emission treatment system for flue gas is greater

Method used

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  • Energy-saving recycling system for low-grade heat energy in smoke pollutant treatment of thermal power plant

Examples

Experimental program
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Effect test

Embodiment 1

[0030] In this embodiment, the structure of the present invention is described in detail with reference to the drawings.

[0031] Please refer to the attached drawing, a low-grade heat energy recovery and energy-saving system in the treatment of flue gas pollutants in thermal power plants. The system includes air preheater 1, flue gas cooler 2, electrostatic precipitator 3, desulfurization tower 4, wet type Electrostatic precipitator 6, flue gas reheater 7, chimney 8. The flue gas cooler 2 and the flue gas reheater 7 operate independently, and the outlet of the flue gas reheater 7 is also equipped with an energy-saving branch for recovering low-grade heat energy of the thermal power plant. 7 inlet is also equipped with flue gas auxiliary heater 9, the function of flue gas auxiliary heater 9 is when the water temperature at the outlet of the heat pump heating system cannot meet the water temperature demand of the flue gas reheater 7 inlet or when the heat pump energy-saving bra...

Embodiment 2

[0051] In the energy-saving branch circuit working mode, after the flue gas is discharged from the boiler, it passes through 1, the flue gas cooler 2, the electrostatic precipitator 3, the FGD desulfurization tower 4, the wet electrostatic precipitator 6 (may or may not be installed), the flue gas The reheater 7 is finally discharged through the chimney 8.

[0052] When the boiler is running normally, the flue gas cooler absorbs the heat in the flue gas to heat the condensate water of the boiler to reduce the coal consumption of power generation, and at the same time reduce the temperature of the flue gas entering the electrostatic precipitator to improve the dust removal efficiency. The first type of absorption heat pump 10 is in operation, the bypass channel valve is closed, and the water diversion pump 12 and the booster pump 5 are in operation. Automatically adjust the steam flow rate and The open-loop cooling water or closed-loop cooling water flow into the evaporator 10...

Embodiment 3

[0057] In the energy-saving branch fault working mode, combined with Embodiment 1, when the first type of absorption heat pump 10 fails or is overhauled, the valve entering and exiting the heat pump 10 is closed, the bypass valve is opened, and the medium water is only heated by the flue gas auxiliary heater 12 to The required inlet temperature of the flue gas reheater.

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Abstract

The invention provides an energy-saving recycling system for low-grade heat energy in smoke pollutant treatment of a thermal power plant. The system comprises a smoke cooler, a smoke reheater and a smoke auxiliary heater; an energy-saving branch for recycling the low-grade heat energy of the thermal power plant is arranged between the smoke cooler and the smoke reheater, and a first absorption heat pump and a water-water heat exchanger are arranged on the energy-saving branch; the first absorption heat pump comprises an absorber, a condenser, an evaporator and a generator; and according to the energy-saving recycling system for the low-grade heat energy in smoke pollutant treatment of the thermal power plant, it is ensured that under the condition that a smoke pollutant treatment system keeps stable running, an original smoke cooler is used for heating boiler condensate water so as to reduce coal consumption, and the water-water heat exchanger is matched with the first absorption heat pump to effectively recycle the low-grade heat energy in circulating water so as to heat medium water drained out of the smoke heater; and water resources are saved, and the comprehensive energy utilization rate of running of the pollutant treatment system is improved.

Description

technical field [0001] The invention relates to a pollutant treatment system of a thermal power plant, in particular to a low-grade heat energy recovery and energy-saving system in the treatment of flue gas pollutants in a thermal power plant. Background technique [0002] With the improvement of air pollutant emission standards for thermal power plants in my country, all newly built, under construction and active thermal power units need to adopt advanced flue gas clean emission technology to achieve ultra-low emission of air pollutants. According to the current technical level, the co-processing process of flue gas pollutants based on flue gas cooling and reheating technology is recognized as the main technical route to achieve ultra-low emissions from coal-fired power plants. [0003] Its working principle is that the flue gas cooling and reheating technology includes two gas-water heat exchangers, one is the flue gas cooler, which is usually located on the flue between t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23J15/02F23J15/06F22D11/06
CPCF22D11/06F23J15/022F23J15/06Y02E20/30
Inventor 赵军方志星陈理帅林少平张东明杨晨李煦侃
Owner ZHEJIANG ZHENENG ENERGY SAVING TECH
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