A device and method for preventing ammonium hydrogen sulfate from blocking the air preheater of a coal-fired boiler

A technology of air preheater and coal-fired boiler, which is applied in the direction of combustion method, combustion product treatment, lighting and heating equipment, etc., which can solve the problems of air preheater blockage, etc., and achieve the effect of avoiding influence and facilitating normal operation

Active Publication Date: 2016-04-13
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] Even so, the NH in the flue gas caused by the change of the coal quality of coal-fired boilers and the improper control of ammonia slip 3 escape concentration, SO 3 Concentration and H 2 The change of O concentration will still bring about the formation of liquid ammonium bisulfate on the surface of the heat transfer element of the air preheater, which will block the air preheater

Method used

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  • A device and method for preventing ammonium hydrogen sulfate from blocking the air preheater of a coal-fired boiler

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Effect test

Embodiment 1

[0020] Such as figure 1 The one shown includes the first air blower 1, the first outlet baffle door 2, the air side of the first air preheater 3, the coal-fired boiler 4, the denitrification device 5, and the flue gas side of the first air preheater 3 connected in sequence , the first dust collector 6, the first inlet baffle door 7 and the first induced draft fan 8, the coal-fired boiler 4 is connected to the air side outlet of the second air preheater 9 at the same time, and the air side of the second air preheater 9 The inlet is connected to the second outlet baffle door 10, the second outlet baffle door 10 is connected to the second blower 11, the flue gas side inlet of the second air preheater 9 is connected to the denitrification device 5, and the flue gas side outlet of the second air preheater 9 The second dust collector 12, the second inlet baffle door 13 and the second induced draft fan 14 are connected in sequence, wherein the first outlet baffle door 2 is connected ...

Embodiment 2

[0023] A coal-fired boiler equipped with SCR flue gas denitrification device in a power plant has a capacity of 300MW, and its structure diagram is as follows figure 1 shown. Sulfur content in the incoming coal of the coal-fired boiler is 1.0%, ammonia escape concentration at the outlet of the denitrification device is 2.0mg / m 3 (2.667μmol / mol), the coal-fired boiler adjusts the output of the first induced draft fan 8, the second induced draft fan 14 and the output of the first blower 1 and the second blower 11, as well as the wind connecting door 16 and the second flue gas connecting door 17 The opening and closing control of the first air preheater 3 increases the mass flow ratio of the flue gas flow at the flue gas side inlet to the air side inlet air to more than 5, so that the temperature at the flue gas side outlet of the first air preheater 3 reaches 280-300 °C for 4 hours. After 24 hours of working time, the working state of the first air preheater 3 and the second a...

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Abstract

The invention discloses a device and method for preventing ammonium bisulfate from blocking the air preheater of a coal-fired boiler. The mass flow ratio of the flue gas at the inlet of the flue gas side of the heater to the air at the inlet of the air side of the air preheater reaches β, so that the temperature at the outlet of the flue gas side of the air preheater rises to 210-320°C for not less than h hours, and at the same time Open the flue gas connection door on the pipeline from the air preheater to the dust collector to make the inlet temperature of the dust collector ≤ 160 °C. The invention can effectively prevent the problem of ammonium bisulfate blocking the air preheater of the coal-fired boiler caused by flue gas denitrification. It is the effect of the bag filter, which is beneficial to the normal operation of the coal-fired boiler.

Description

technical field [0001] The invention belongs to the technical field of flue gas denitrification in thermal power plants, and in particular relates to a device and a method for preventing ammonium bisulfate from clogging an air preheater of a coal-fired boiler. Background technique [0002] With the increasingly stringent emission standards of thermal power plants, selective catalytic reduction (SCR) or non-selective catalytic reduction (SNCR) has become an indispensable part of coal-fired boilers. Both SCR and SNCR are based on NH 3 as reducing agent, reducing NO X become N 2 and H 2 O, unreacted NH during the reaction 3 It is discharged with the flue gas in the form of escaped ammonia, and a small amount of SO3 and unreacted NH will be produced during the combustion process of the coal-fired boiler 3 and SO 3 And the water in the flue gas undergoes a chemical reaction to form ammonium bisulfate (ABS). The chemical reaction equation is: . It can be seen from the equa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23L15/00F23J3/02
CPCY02E20/34
Inventor 吴文龙汪永威郭阳王贺岑张营帅李敏王刚段松涛朱莉娜王春玉郭为民孙宁
Owner STATE GRID CORP OF CHINA
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