CN218001548U - Boiler tail flue UNICOM feedwater heating system - Google Patents

Boiler tail flue UNICOM feedwater heating system Download PDF

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Publication number
CN218001548U
CN218001548U CN202221298524.XU CN202221298524U CN218001548U CN 218001548 U CN218001548 U CN 218001548U CN 202221298524 U CN202221298524 U CN 202221298524U CN 218001548 U CN218001548 U CN 218001548U
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China
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flue gas
pipeline
boiler
heat exchanger
communicated
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CN202221298524.XU
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Chinese (zh)
Inventor
刘宏卫
高正平
郭洋
邱雯
蔡斌
荣俊
韩元
李健
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Inner Mongolia Electric Power Research Institute of Inner Mongolia Power Group Co Ltd
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Inner Mongolia Electric Power Research Institute of Inner Mongolia Power Group Co Ltd
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Abstract

The utility model discloses a boiler afterbody flue UNICOM feedwater heating system, include and set gradually flue gas UNICOM electric baffle B, flue gas heat exchanger entry UNICOM electric baffle and flue gas UNICOM electric baffle A on adjacent stove high temperature flue gas pipeline, be provided with boiler high temperature flue gas-feedwater heat exchanger and boiler low temperature flue gas-condensate heat exchanger on flue gas heat exchanger entry UNICOM electric baffle and flue gas UNICOM electric baffle A's the pipeline, through boiler low temperature flue gas-condensate heat exchanger's pipeline and flue gas UNICOM electric baffle C's pipeline UNICOM back, join with the pipeline of boiler air heater export. The utility model discloses utilize the heat of discharging fume of air preheater entry of adjacent stove afterbody flue to heat boiler feed water and condensate water, can shorten supercritical unit start-up process cold state and hot state washout time, realize not improving the target of feedwater temperature through boiler combustion.

Description

Boiler afterbody flue UNICOM feedwater heating system
Technical Field
The utility model belongs to the technical field of coal-fired generating set, in particular to boiler afterbody flue UNICOM feedwater heating system.
Background
Under the encouragement and promotion of national energy-saving and emission-reducing policies, power generation enterprises realize the conversion of loss into win or continuous profit through a series of energy-saving technical transformation. The cold-state starting work of the supercritical coal-fired boiler grinding group needs to be carried out in a mode of a boiler air duct burner in the starting process of the coal-fired unit, a large amount of fuel oil is consumed in the mode, the environment is polluted, the operation cost is high, the requirements of national energy-saving emission-reduction related policies are not met, meanwhile, the temperature of a cold-state starting hearth is low, pulverized coal is not completely combusted, and certain potential safety hazards are provided.
SUMMERY OF THE UTILITY MODEL
In order to overcome above technical problem, the utility model aims to provide a boiler afterbody flue UNICOM feedwater heating system, the heat of discharging fume that utilizes the air preheater entry of adjacent stove afterbody flue heats boiler feedwater and condensate water, can shorten supercritical unit start-up process cold state and hot state wash time, realize not improving the target of feedwater temperature through the boiler burning, this mode has accelerated unit startingspeed, save the demineralized water, improve the washing effect, simultaneously because the furnace temperature improves the burn-off of buggy has certain advantage when starting to the boiler cold state, the security of system operation has been improved, and can reduce adjacent stove exhaust gas temperature, improve the operation economy nature.
In order to realize the purpose, the utility model discloses a technical scheme is:
a boiler tail flue communicated feed water heating system comprises a flue gas communicated electric baffle B, a flue gas heat exchanger inlet communicated electric baffle and a flue gas communicated electric baffle A which are sequentially arranged on a high-temperature flue gas pipeline of an adjacent boiler, wherein a boiler high-temperature flue gas-feed water heat exchanger and a boiler low-temperature flue gas-condensed water heat exchanger are arranged on a pipeline of the flue gas heat exchanger inlet communicated electric baffle and the flue gas communicated electric baffle A, and are communicated with a pipeline of a boiler air preheater after passing through the pipeline of the boiler low-temperature flue gas-condensed water heat exchanger and the pipeline of the flue gas communicated electric baffle C.
A branch pipeline is arranged on a pipeline between the flue gas communicated electric baffle B and the flue gas heat exchanger inlet communicated electric baffle, a second boiler high-temperature flue gas-water supply heat exchanger and a second boiler low-temperature flue gas-condensed water heat exchanger are arranged on the branch pipeline, one pipeline at the outlet of the second boiler low-temperature flue gas-condensed water heat exchanger is communicated with a pipeline of the flue gas communicated electric baffle C, the other pipeline is communicated with a pipeline provided with a flue gas communicated electric baffle D, and the pipeline output end of the flue gas communicated electric baffle D is communicated with a pipeline provided with a second boiler air preheater.
And a pipeline of the outlet of the second boiler low-temperature flue gas-condensed water heat exchanger is communicated with a pipeline of the flue gas communicated electric baffle C, and the flue gas heat exchanger outlet communicated electric baffle is arranged at the pipeline communicated part of the second boiler low-temperature flue gas-condensed water heat exchanger.
The beneficial effects of the utility model.
The utility model discloses can reduce supercritical unit thermal state washing process wind channel combustor to fuel consumption, the operation is more economical. Because the system utilizes the heat of the flue gas at the inlet of the air preheater, the extracted steam of the steam turbine is discharged, the cascade utilization of energy is realized, and the circulating thermal efficiency of the unit is improved.
The utility model discloses a flue gas heat of available adjacent unit heats local water supply system when the local starts, and the system has realized that two unit afterbody flues are each other for reserve, has improved the reliability of system operation.
The utility model discloses to the high unit of exhaust gas temperature, can also reduce adjacent unit or this unit air preheater entry flue gas flow through this system, heat local feedwater and condensate water, improve feedwater temperature, reduce adjacent unit or local exhaust gas temperature on the one hand, on the other hand has reduced the heat transfer difference in temperature of this unit flue gas with the feedwater, has improved energy utilization's (for fire) efficiency.
Description of the drawings:
fig. 1 is a schematic diagram of the system structure of the present invention.
Reference numerals:
1. a first boiler air preheater; 2. a second boiler air preheater; 3. the electric baffle plate A is communicated; 4. the inlet of the flue gas heat exchanger is communicated with an electric baffle; 5. the flue gas is communicated with an electric baffle B;6. the smoke outlet is communicated with an electric baffle C;7. the outlet of the flue gas heat exchanger is communicated with an electric baffle; 8. the flue gas is communicated with an electric baffle plate D;9. boiler I high-temperature flue gas-feed water heat exchanger; 10. the second boiler high-temperature flue gas-water supply heat exchanger; 11. a boiler I low-temperature flue gas-condensed water heat exchanger; 12. the second boiler low-temperature flue gas-condensed water heat exchanger.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.
As shown in fig. 1: a boiler tail flue UNICOM feedwater heating system, includes that set gradually flue gas UNICOM electric baffle B5, flue gas heat exchanger entry UNICOM electric baffle 5, flue gas UNICOM electric baffle A3 on adjacent stove high temperature flue gas pipeline, be provided with a branch road pipeline on the pipeline between flue gas UNICOM electric baffle A3 and the flue gas heat exchanger entry UNICOM electric baffle 4, a branch road pipeline boiler high temperature flue gas-feedwater heat exchanger 9 and boiler low temperature flue gas-condensate heat exchanger 11, behind the pipeline UNICOM of boiler low temperature flue gas-condensate heat exchanger 11 and flue gas UNICOM electric baffle C6, join with the pipeline of boiler air preheater 1 export.
A branch pipeline is arranged on a pipeline between the flue gas communicated electric baffle B5 and the flue gas heat exchanger inlet communicated electric baffle 4, a boiler high-temperature flue gas-water supply heat exchanger 10 and a boiler low-temperature flue gas-condensed water heat exchanger 12 are arranged on the branch pipeline, the pipeline at the outlet of the boiler low-temperature flue gas-condensed water heat exchanger 12 is communicated with the pipeline of the flue gas communicated electric baffle C6, the pipeline at the outlet of the boiler low-temperature flue gas-condensed water heat exchanger D8 is communicated with the pipeline of the flue gas communicated electric baffle D8, and the pipeline output end of the flue gas communicated electric baffle D8 is communicated with the pipeline of the boiler air preheater 2.
And a flue gas heat exchanger outlet communicated electric baffle 7 is arranged at the position where one way of the pipeline at the outlet of the second boiler low-temperature flue gas-condensed water heat exchanger 12 is communicated with the pipeline of the flue gas communicated electric baffle C6.
The utility model discloses a theory of operation:
1. meet the requirement of hot washing on the water supply temperature in the starting process of the supercritical coal-fired unit
The high-temperature flue gas of the second boiler enters the high-temperature flue gas of the first boiler, namely the water supply heat exchanger 9 and the low-temperature flue gas of the first boiler, namely the condensate heat exchanger 11 through the flue gas communicating electric baffle B5 and the flue gas heat exchanger inlet communicating electric baffle 4, exchanges heat with the water supply and condensate system of the first unit, improves the temperature of the water supply of the first unit, and the flue gas after heat exchange enters the flue gas side outlet of the air preheater through the flue gas communicating electric baffle C6 and is discharged into the atmosphere under the action of the draught fan of the first unit.
The same holds for the second unit.
The high-temperature flue gas of the first boiler enters a water supply heat exchanger 10 of a second boiler and a condensed water heat exchanger 12 of a second boiler through a flue gas communicated electric baffle A3 and a flue gas heat exchanger inlet communicated electric baffle 4, exchanges heat with a water supply and condensed water system of the second unit, improves the temperature of the water supply of the second unit, and the flue gas after heat exchange enters a flue gas side outlet of a second unit air preheater 2 through a flue gas communicated electric baffle D8 and is discharged into the atmosphere under the action of a draught fan of the second unit.
For a unit with high exhaust gas temperature, for example, when the unit operates normally, in order to reduce the exhaust gas temperature of the boiler I and realize the cascade utilization of heat, the boiler I can enter the boiler I, namely high-temperature flue gas, the water supply heat exchanger 9 and the boiler I, namely low-temperature flue gas, the condensate heat exchanger 11 through the communicated electric baffle A3, exchange heat with a unit I, namely water supply and condensate system, improve the temperature of the unit I, enter the flue gas side outlet of the boiler I, namely the air preheater 1 through the flue gas communicated electric baffle C6, and discharge the flue gas into the atmosphere under the action of a unit I induced draft fan.
The same is true for the second unit aiming at the unit with high exhaust gas temperature.

Claims (3)

1. A boiler tail flue communicated feed water heating system is characterized by comprising a flue gas communicated electric baffle B (5), a flue gas heat exchanger inlet communicated electric baffle (4) and a flue gas communicated electric baffle A (3) which are sequentially arranged on an adjacent boiler high-temperature flue gas pipeline, wherein a boiler high-temperature flue gas-feed water heat exchanger (9) and a boiler low-temperature flue gas-condensed water heat exchanger (11) are arranged on a pipeline of the flue gas heat exchanger inlet communicated electric baffle (4) and the flue gas communicated electric baffle A (3), and after the pipeline of the boiler low-temperature flue gas-condensed water heat exchanger (11) is communicated with a pipeline of the flue gas communicated electric baffle C (6), the pipeline is converged with a pipeline of an outlet of a boiler air preheater (1).
2. The boiler tail flue communicated feed water heating system according to claim 1, wherein a branch pipeline is arranged on a pipeline between the flue gas communicated electric baffle B (5) and the flue gas heat exchanger inlet communicated electric baffle (4), a second boiler high-temperature flue gas-feed water heat exchanger (10) and a second boiler low-temperature flue gas-condensate water heat exchanger (12) are arranged on the branch pipeline, one pipeline at an outlet of the second boiler low-temperature flue gas-condensate water heat exchanger (12) is communicated with a pipeline of a flue gas communicated electric baffle C (6), the other pipeline is communicated with a pipeline of a flue gas communicated electric baffle D (8), and a pipeline output end of the flue gas communicated electric baffle D (8) is communicated with a pipeline of a second boiler air preheater (2).
3. The boiler tail flue communicated water heating system according to claim 2, wherein a flue gas heat exchanger outlet communicated electric baffle (7) is arranged at a position where one way of a pipeline at the outlet of the second boiler low-temperature flue gas-condensed water heat exchanger (12) is communicated with a pipeline of the flue gas communicated electric baffle C (6).
CN202221298524.XU 2022-05-26 2022-05-26 Boiler tail flue UNICOM feedwater heating system Active CN218001548U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202221298524.XU CN218001548U (en) 2022-05-26 2022-05-26 Boiler tail flue UNICOM feedwater heating system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202221298524.XU CN218001548U (en) 2022-05-26 2022-05-26 Boiler tail flue UNICOM feedwater heating system

Publications (1)

Publication Number Publication Date
CN218001548U true CN218001548U (en) 2022-12-09

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202221298524.XU Active CN218001548U (en) 2022-05-26 2022-05-26 Boiler tail flue UNICOM feedwater heating system

Country Status (1)

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CN (1) CN218001548U (en)

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