Double-circulation device and method for recovering and heating furnace-entering air through waste heat of boiler discharged smoke

A waste heat recovery and dual-cycle technology, applied in lighting and heating equipment, feed water heaters, preheating, etc., can solve problems such as imperfect system design and failure to achieve expected results, reduce social and economic benefits, prevent Smoke condensation, the effect of avoiding smoke condensation

Active Publication Date: 2016-02-24
上海羲蓝节能环保科技有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a kind of coal-saving, water-saving, and reduce flue gas emission double-circulation boiler exhaust waste heat recovery heating furnace air equipment and method, which solves the problem of heating the boiler inlet air temperature. The problem that the expected effect cannot be achieved due to the imperfect system design

Method used

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  • Double-circulation device and method for recovering and heating furnace-entering air through waste heat of boiler discharged smoke
  • Double-circulation device and method for recovering and heating furnace-entering air through waste heat of boiler discharged smoke

Examples

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Embodiment 1

[0051] For example, a 1000MW boiler in a power plant, when the unit is operating at 0°C in winter, for figure 1 For the system shown (this system is a flue gas waste heat deep utilization system applied to Guodian Fuzhou Power Plant), the temperature rise of the air heater is required to be 50°C; when the ambient temperature is 35°C, the temperature rise of the air heater is required to be 25°C . Low-temperature economizer 8 is not equal to the heating power of the air heater, and the system cannot be balanced. The result of the actual operation is that the air temperature at the outlet of the heater does not reach 60°C, and may be as low as 30°C. When the air temperature at the inlet of the boiler air preheater 4 decreases, the temperature of the flue gas at the outlet of the boiler air preheater 4 will also decrease accordingly , possibly to 100°C, if the gas temperature at the inlet of the electric precipitator 6 is still required to be 90°C, the temperature drop of the fl...

Embodiment 2

[0056] For example, a 1000MW boiler in a power plant, when the unit operates at 35°C in summer, for figure 1 For the system shown, a heater temperature rise of 15°C is required. Low-temperature economizer 8 is not equal to the heating power of the air heater, and the system cannot be balanced. The result of actual operation is that the air temperature at the outlet of the heater exceeds 50°C and reaches 60°C. When the air temperature at the inlet of the boiler air preheater 4 increases, the flue gas temperature at the outlet of the boiler air preheater 4 will also increase correspondingly, possibly to 95 ℃, not meeting the design expectations.

[0057] but for figure 2 For the system shown, when the ambient temperature is 35°C, the temperature of the air heater is required to rise by 25°C. The thermal power of the low-temperature economizer 8 and the air heater is naturally balanced by means of the condensate system. The result of the actual operation is that the outlet a...

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Abstract

The invention provides a double-circulation device and method for recovering and heating furnace-entering air through waste heat of boiler discharged smoke. The double-circulation device is connected with a turbine steam extraction and heat return system through open circulation, and therefore recycled smoke waste heat and heat required for heating put-into-furnace air are automatically balanced, smoke is prevented from dewing, smoke low-temperature corrosion is prevented, it is ensured that the influences of environment temperature changes and unit load changes on boiler smoke discharge temperature can be offset under all working conditions, and the inlet smoke temperature of electric dust collectors and the temperature of put-into-furnace air can be automatically controlled under all the working conditions no matter how the environment temperature changes and no matter how the unit load changes. The double-circulation device and method have social benefits and economic benefits of being capable of saving coal and water and decreasing the smoke discharge amount.

Description

technical field [0001] The invention relates to a device and a method for recovering and heating the furnace air by exhausting smoke and waste heat of a double-cycle boiler, and belongs to the technical field of low-temperature economizers in thermal power plants. Background technique [0002] The boiler exhaust gas temperature of the generator set in a thermal power plant generally takes a value of 120-140 °C. Due to the following two reasons, the further reduction of flue gas temperature by supporting low-temperature economizers is not only in line with the national strategy of energy conservation and environmental protection, but also economical in energy conservation and environmental protection. The investment payback period is generally 3 to 5 years. [0003] 1) The rapid rise of coal prices has increased the economic benefits of saving coal; [0004] 2) Flue gas desulfurization (FGD for short), the lime-gypsum stone wet flue gas desulfurization technology of coal-fir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22D1/36
CPCF22D1/36
Inventor 赵贤立
Owner 上海羲蓝节能环保科技有限公司
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