Device and method for preventing ammonium bisulfate from blocking air preheaters of coal-fired boiler

A technology for air preheaters and coal-fired boilers, which is applied in combustion methods, lighting and heating equipment, and treatment of combustion products. It can solve problems such as air preheater blockage, and achieve the effect of avoiding impact and facilitating normal operation

Active Publication Date: 2014-09-10
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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  • Device and method for preventing ammonium bisulfate from blocking air preheaters of 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. The sulfur content in the incoming coal of the coal-fired boiler is 1.0%, and the 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 and 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 a...

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Abstract

The invention discloses a device and a method for ammonium bisulfate from blocking air preheaters of a coal-fired boiler. The method includes controlling a mass flow ratio of inlet flue gas on flue gas sides of the air preheaters to inlet air on air sides of the air preheaters according to sulfur contents S<ad> of inlet coal of the coal-fired boiler and outlet ammonia slip concentration C<slip NH3> of denitration equipment until the mass flow ratio reaches beta; enabling outlet temperatures of the flue gas sides of the air preheaters to rise and range from 210 DEG C to 320 DEG C and keeping the outlet temperatures of the flue gas sides of the air preheaters unchanged for longer than h hours; opening flue gas communicating doors on pipelines among the air preheaters and dust collectors; enabling inlet temperatures of the dust collectors to be lower than or equal to 160 DEG C. The device and the method have the advantages that the problem that existing air preheaters of a coal-fired boiler are blocked by ammonium bisulfate due to flue gas denitration can be effectively solved; influence of flue gas temperature rise on the dust collectors, particularly bag type dust collectors, can be prevented by means of arranging and adjusting the flue gas communicating doors, and accordingly the device and the method are favorable for normal running 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 equ...

Claims

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Application Information

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Patent Type & Authority Applications(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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