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Flue gas system for unbalance control of flue gas flow

A flue gas flow and unbalanced technology, applied in the field of flue gas system, can solve the problems of low-temperature corrosion and clogging, air preheater low-temperature corrosion, boiler thermal efficiency reduction, etc., to solve low-temperature corrosion and clogging, and prevent low-temperature corrosion and dust blocking, improve the effect of safety and economy

Inactive Publication Date: 2009-10-28
XIAN THERMAL POWER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] From the point of view of the principle of preventing low-temperature corrosion and ash plugging of the air preheater, the balanced distribution of the flue gas flow in a single flue makes the heat storage plate of the air preheater have the lowest temperature at the uppermost end of the flue gas channel, and the flue gas temperature at the outlet is also the lowest. Lowest, most likely to cause low temperature corrosion and dust blocking
In order to prevent the low-temperature corrosion and ash blocking of the air preheater, it is necessary to ensure that the outlet flue gas temperature at the uppermost end of the flue gas channel of the air preheater is above a certain value of the acid dew point temperature, so that the exhaust gas temperature of the boiler will increase and the thermal efficiency of the boiler will decrease
If the average temperature of the flue gas is controlled below a certain value of its acid dew point temperature, although the exhaust gas temperature of the boiler will be reduced, it will cause low-temperature corrosion and ash blocking of the air preheater
This contradiction cannot be solved in the existing flue gas system
[0006] The essence of the above problems is that the existing single-inlet flue gas channel of the air preheater can only distribute the flue gas flow in a balanced manner, and cannot be adjusted artificially. Therefore, the existing flue gas system and its devices cannot solve the problem of air preheating. The temperature distribution of flue gas at the outlet of the heater is relatively large, and the heat exchange efficiency of the air preheater cannot be improved.

Method used

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  • Flue gas system for unbalance control of flue gas flow
  • Flue gas system for unbalance control of flue gas flow
  • Flue gas system for unbalance control of flue gas flow

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Example 1: see figure 1 , this embodiment includes an air preheater 1, an air preheater outlet flue 2 and an air preheater inlet flue 3 that communicate with the air preheater 1, and the air preheater inlet flue 3 is provided with A partition plate 4, which divides the air preheater inlet flue 3 into two small flue gas passages with equal flow areas, and the small flue gas passage at the lower end of the air preheater flue gas passage is also An adjustment door 13 is provided. In this embodiment, a partition plate 4 and a regulating door 13 are newly added to the original flue gas system, so that the flue gas is divided into two small flue gas channels before entering the air preheater. The regulating door 13 in the air passage can adjust the flue gas flow of the two small flue gas passages according to the operation needs, while effectively preventing low-temperature corrosion and ash blocking of the air preheater, and reducing the exhaust gas temperature of the boile...

Embodiment 2

[0029] Example 2, see figure 2 , the partition plate 4 of this embodiment is installed at the upper end of the deflection according to the direction of the air preheater, and divides the original flue into two small flue gas channels with different flow areas, and is located at the lower end of the air preheater flue gas channel The small flue gas channel flow section is relatively large. Other connections are the same as in Embodiment 1.

Embodiment 3

[0030] Embodiment 3: see image 3 In this embodiment, the position of the partition plate 4 is biased towards the small flue gas channel at the lower end according to the direction of the air preheater, and the original flue is divided into two small flue channels with different flow areas. The flow section of the small flue gas channel at the lower end of the gas channel is relatively small. Other connections are the same as in Embodiment 1.

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Abstract

The invention relates to a flue gas system for unbalance control of flue gas flow, which comprises an air preheater, an air preheater outlet flue and an air preheater inlet flue which are communicated with the air preheater. N partition boards are arranged in the air preheater inlet flue to partition the air preheater inlet flue into N+1 small flue gas passages in which N adjusting doors are arranged. By adjusting the flue gas flow through the adjusting doors, the flue gas flow flowing through the air preheater forms certain deviation according to the metal temperature variation of a heat storage plate, namely when the metal temperature of the heat storage plate is lower, the heat transfer temperature pressure with the flue gas is larger, and the flue gas flow flowing through the surface of the air preheater is relatively large; and when the metal temperature of the heat storage plate is raised in the flue gas passage along with the rotation of the air preheater, the flue gas flow flowing through the surface of the air preheater is relatively reduced.

Description

technical field [0001] The invention relates to a flue gas system of a power station boiler, in particular to a flue gas system for unbalanced control of the flue gas flow of the power station boiler. Background technique [0002] With the application of rotary air preheater and the capacity development of power plant units, the deviation of flue gas temperature distribution in the outlet flue of air preheater is getting bigger and bigger. Taking a certain 1000MW unit boiler as an example, the upper end of the flue gas channel of the air preheater (according to the rotation direction of the air preheater, the part of the flue gas channel that the rotor first enters from the air side is the upper end, and the part that enters after the upper end is the lower end, the same below) the flue gas at the outlet is the lowest, and its temperature is more than 40°C lower than the lower end of the flue gas channel outlet, and about 20°C lower than the average flue gas temperature. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23L15/00
CPCY02E20/34
Inventor 王春昌
Owner XIAN THERMAL POWER RES INST CO LTD
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