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System preventing low-temperature corrosion of power station boiler

A technology for low-temperature corrosion and power plant boilers, applied in the direction of combustion methods, feed water heaters, preheating, etc., can solve the problems of exhaust gas temperature rise and seriousness, and achieve the effects of preventing low-temperature corrosion, improving boiler efficiency, and avoiding low-temperature corrosion

Inactive Publication Date: 2017-08-18
JIANGLIAN HEAVY IND GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to solve the low-temperature corrosion of the air preheater, it is usually used to add a heater before the air preheater to increase the air temperature at the inlet of the air preheater, but this also causes the exhaust gas temperature to rise, especially for high ash fuels

Method used

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  • System preventing low-temperature corrosion of power station boiler
  • System preventing low-temperature corrosion of power station boiler
  • System preventing low-temperature corrosion of power station boiler

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0026] Specific implementation mode one: combine figure 1 Explain, a system for preventing low-temperature corrosion of power plant boilers, for high-pressure and above condensing-type primary reheat generating sets with a feedwater temperature above 200°C, the system includes a combustion device 1, a furnace 2, a superheater 3, a drum 4, Steam header 5, regulating valve 6, high temperature economizer 7, high temperature air preheater 8, low temperature economizer 9, medium temperature air preheater 10, flue gas feed water heater 11, gas water air preheater 12 , fan 13, high pressure heater 14, boiler feed water pump 15, deaerator 16, low pressure heater 17, condensate pump 18, condenser 19, steam turbine high pressure cylinder 20, reheater 23, steam turbine medium and low pressure cylinder 24.

[0027] The air required for combustion enters the air-water air preheater 12 through the fan 13, is heated to about 70°C-100°C, and then is further heated to the design temperature of...

specific Embodiment approach 2

[0029] Specific implementation mode two: combination figure 2 Explain, a system for preventing low-temperature corrosion of power plant boilers, for high-pressure and above condensing steam generator sets with a feedwater temperature above 200°C, the system includes a combustion device 1, a furnace 2, a superheater 3, a drum 4, and a steam collector Box 5, regulating valve 6, high temperature economizer 7, high temperature air preheater 8, low temperature economizer 9, medium temperature air preheater 10, flue gas feed water heater 11, gas water air preheater 12, fan 13 , High pressure heater 14, boiler feed water pump 15, deaerator 16, low pressure heater 17, condensate water pump 18, condenser 19, steam turbine 25.

[0030] The air required for combustion enters the air-water air preheater 12 through the fan 13, is heated to about 70°C-100°C, and then is further heated to the design temperature of the hot air by the medium-temperature air preheater 10 and the high-temperatu...

specific Embodiment approach 3

[0032] Specific implementation mode three: combination image 3 Description, a low-temperature corrosion prevention system for utility boilers, for condensing steam generating units with a feed water temperature of 145°C to 155°C and below high pressure, the system includes a combustion device 1, a furnace 2, a superheater 3, a drum 4, and a steam header 5. Control valve 6, high temperature economizer 7, high temperature air preheater 8, low temperature economizer 9, medium temperature air preheater 10, flue gas feed water heater 11, gas water air preheater 12, fan 13, High pressure heater 14, boiler feed water pump 15, deaerator 16, low pressure heater 17, condensate water pump 18, condenser 19, mixing header 21, steam turbine 25.

[0033] The air required for combustion passes through the fan 13 and enters the air-water air preheater 12 to be heated to about 70°C-100°C, and then passes through the medium-temperature air preheater 10 and high-temperature air preheater 8 in th...

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Abstract

The invention discloses a system preventing low-temperature corrosion of a power station boiler and a method preventing the low-temperature corrosion of the power station boiler. Cold air is heated by hot water in an air water air preheater and then fed to a medium-temperature air preheater arranged in a rear smoke channel of the boiler, the temperature of the metal wall of the medium-temperature air preheater can be raised to be higher than the temperature of a smoke acid dew point, and therefore the low-temperature corrosion of the air preheater is avoided. A smoke water feeding heater is arranged behind the air preheater of the rear smoke channel of the boiler to reduce the exhaust smoke temperature, meanwhile, as the temperature of the gas entering the smoke water feeding heater is about 100 DEG C, the low-temperature corrosion of the smoke water feeding heater is also effectively avoided, the heat of the whole unit is not increased or decreased, and the power generation efficiency of the unit cannot be affected.

Description

technical field [0001] The invention belongs to the field of boiler equipment, and in particular relates to a low-temperature corrosion prevention system for a power station boiler, in particular to a low-temperature corrosion prevention system for a heating surface at the rear of a power station boiler burning high-moisture and high-sulfur fuels. Background technique [0002] In power plant boilers (including layered combustion, fluidized combustion, suspension combustion, etc.) burning high-moisture fuels, such as biomass, domestic waste, sludge, coal slime, lignite, etc., the exhaust gas temperature will be high, especially at high temperature and high pressure The situation is more serious in boilers with parameters above and above. In order to reduce the exhaust gas temperature, the usual method is to arrange condensate water heaters in the tail flue or arrange other external heating surfaces after the air preheater. Although the above methods can reduce the temperature ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23L15/00F22D1/36F22D1/50
CPCF22D1/36F22D1/50F23L15/00Y02E20/34
Inventor 杨文李成林徐勇敏周圣林吴冬火
Owner JIANGLIAN HEAVY IND GRP CO LTD
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