CN102589001A - Analysis method for high-temperature corrosion inclination of water-cooled wall of pulverized coal boiler based on flue gas components - Google Patents
Analysis method for high-temperature corrosion inclination of water-cooled wall of pulverized coal boiler based on flue gas components Download PDFInfo
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- CN102589001A CN102589001A CN2012100684670A CN201210068467A CN102589001A CN 102589001 A CN102589001 A CN 102589001A CN 2012100684670 A CN2012100684670 A CN 2012100684670A CN 201210068467 A CN201210068467 A CN 201210068467A CN 102589001 A CN102589001 A CN 102589001A
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Abstract
The invention discloses an analysis method for high-temperature corrosion inclination of a water-cooled wall of a pulverized coal boiler based on flue gas components. High-temperature corrosion of the water-cooled wall is a common problem and is not easy to judge. A flue gas sampling device and a flue gas analyzer close to the water-cooled wall are used for obtaining the flue gas components of oxygen concentration and CO (carbonic oxide) concentration close to the water-cooled wall, and by combining the sulfur content of coal as fired, the high-temperature corrosion inclination of the water-cooled wall is judged according to the conditions: a) 0.6% of the sulfur content of the coal is a basic condition for high-temperature corrosion; b) high-temperature corrosion is not easy to occur when the oxygen concentration is 2%; c) the high-temperature corrosion inclination of the water-cooled wall is high when the oxygen concentration is 1%; and d) the high-temperature corrosion inclination of the water-cooled wall is high when the oxygen concentration ranges from 1% to 2%, and the CO concentration is 1%. By the aid of the analysis method, the high-temperature corrosion inclination of the water-cooled wall is effectively weakened, low-NOx (nitric oxide) combustion of the boiler and coordinated control are realized, and high-temperature corrosion is prevented.
Description
Technical field
The invention belongs to the safe operation of the boiler technical field, relate in particular to a kind of pulverized-coal fired boiler water wall high temperature corrosion based on sentiment classification method based on smoke components.
Background technology
In pulverized coal firing boiler; Water wall high temperature corrosion is more common problem, when main cause is the zonal combustion of coal dust burner hearth flame kernel, near water-cooling wall, has formed stronger reducing atmosphere (CO of high concentration); In the reducing atmosphere of high temperature, combustion intermediate product H
2S gas produces certain corrosiveness to the water-cooling wall metal.In recent years, along with the raising of environmental requirement, low NOx combustion is popularized gradually, and wherein major technique " air classification low NOx combusting technology " is exactly to form certain reducing atmosphere at the burning nucleus, suppresses the generation of NOx.The negative effect that the air classification low NOx combusting technology is used makes that exactly boiler water-cooling wall high-temperature corrosion tendentiousness is more serious, and is especially more outstanding with the front-back wall swirl flow combustion boiler that liquidates.
According to the principle that water wall high temperature corrosion produces, the major measure that prevents high temperature corrosion is exactly to avoid near water-cooling wall, existing stronger reducing atmosphere.Which kind of degree is the reducing atmosphere of flue gas reach near the boiler water wall, can exert an influence to water-cooling wall, is the current problem of comparatively paying close attention to.
Summary of the invention
The objective of the invention is deficiency, a kind of pulverized-coal fired boiler water wall high temperature corrosion based on sentiment classification method based on smoke components is provided to prior art.
The concrete steps of the inventive method are:
Step (1). gather near the flue gas of water-cooling wall of boiler key area;
Step (2). analyze the gas component in the flue gas with gas analysis instrument, comprise oxygen concentration and CO concentration;
Step (3). analyze actual coal-fired sulfur content according to national standard method;
Step (4). according to following condition analysis pulverized-coal fired boiler water wall high temperature corrosion tendentiousness:
If the sulfur content
of coal 0.6% o'clock gets into step (5) and continues to analyze; If sulfur content＜0.6% of coal then is judged as and is not easy to take place high temperature corrosion;
Step (5). if oxygen concentration
2% then is judged as and is not easy to take place high temperature corrosion; If oxygen concentration
1%, the tendentiousness that then is judged as water-cooling wall generation high temperature corrosion is bigger; If oxygen concentration is between 1%～2%, CO concentration simultaneously>1% o'clock, the tendentiousness that then is judged as water-cooling wall generation high temperature corrosion is bigger.
Beneficial effect of the present invention is following:
Through detection near the smoke components boiler key area water-cooling wall; Boiler is carried out suitable burning adjustment; Perhaps suitable combustion system transformation; Make near the smoke components the boiler water wall reach safety requirements proposed by the invention, can effectively weaken boiler water-cooling wall high-temperature corrosion tendentiousness, realize the boiler low NOx combustion and prevent high temperature corrosion coordination control.
Description of drawings
Fig. 1 is a flue gas sampling device sketch map used in the present invention;
Among the figure: water-cooling wall fin 1, water screen tube 2, water-cooling wall heat-insulation layer 3, gas sampling probe 4, internal thread 5, sealing bolt 6.
The specific embodiment
Below in conjunction with accompanying drawing the present invention is described further.
As shown in Figure 1, flue gas sampling device used in the present invention comprises gas sampling probe 4, sealing bolt 6; This device is installed on the water-cooling wall fin 1 between adjacent 2 water screen tubes 2; Perforate on the water-cooling wall fin 1 of installation site; Gas sampling probe 4 inner port flush with water-cooling wall fin 1 inwall, and gas sampling probe 4 welds with the outer wall sealing of water-cooling wall fin 1, and gas sampling probe 4 runs through water-cooling wall heat-insulation layer 3; Gas sampling probe 4 outer ends have internal thread 5, and with sealing bolt 6 sealings.
The step of concrete pulverized-coal fired boiler water wall high temperature corrosion based on sentiment classification method is following:
Step (1). gather near the flue gas of water-cooling wall of boiler key area;
Step (2). analyze the gas component in the flue gas with gas analysis instrument, comprise oxygen concentration and CO concentration;
Step (3). analyze actual coal-fired sulfur content according to national standard method;
Step (4). according to following condition analysis pulverized-coal fired boiler water wall high temperature corrosion tendentiousness:
If the sulfur content
of coal 0.6% o'clock gets into step (5) and continues to analyze; If sulfur content＜0.6% of coal then is judged as and is not easy to take place high temperature corrosion;
Step (5). if oxygen concentration
2% then is judged as and is not easy to take place high temperature corrosion; If oxygen concentration
1%, the tendentiousness that then is judged as water-cooling wall generation high temperature corrosion is bigger; If oxygen concentration is between 1%～2%, CO concentration simultaneously>1% o'clock, the tendentiousness that then is judged as water-cooling wall generation high temperature corrosion is bigger.
Claims (1)
1. based on the pulverized-coal fired boiler water wall high temperature corrosion based on sentiment classification method of smoke components, it is characterized in that this method comprises the steps:
Step (1). gather near the flue gas of water-cooling wall of boiler key area;
Step (2). analyze the gas component in the flue gas with gas analysis instrument, comprise oxygen concentration and CO concentration;
Step (3). analyze actual coal-fired sulfur content according to national standard method;
Step (4). according to following condition analysis pulverized-coal fired boiler water wall high temperature corrosion tendentiousness:
If the sulfur content
of coal 0.6% o'clock gets into step (5) and continues to analyze; If sulfur content＜0.6% of coal then is judged as and is not easy to take place high temperature corrosion;
Step (5). if oxygen concentration
2% then is judged as and is not easy to take place high temperature corrosion; If oxygen concentration
1%, the tendentiousness that then is judged as water-cooling wall generation high temperature corrosion is bigger; If oxygen concentration is between 1%～2%, CO concentration simultaneously>1% o'clock, the tendentiousness that then is judged as water-cooling wall generation high temperature corrosion is bigger.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012100684670A CN102589001A (en) | 2012-03-15 | 2012-03-15 | Analysis method for high-temperature corrosion inclination of water-cooled wall of pulverized coal boiler based on flue gas components |
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|---|---|---|---|
| CN2012100684670A CN102589001A (en) | 2012-03-15 | 2012-03-15 | Analysis method for high-temperature corrosion inclination of water-cooled wall of pulverized coal boiler based on flue gas components |
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| CN102589001A true CN102589001A (en) | 2012-07-18 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103513008A (en) * | 2013-09-29 | 2014-01-15 | 广东电网公司电力科学研究院 | Method and system for detecting atmosphere of adhesion wall of combustion boiler |
| CN105202560A (en) * | 2015-10-26 | 2015-12-30 | 国网福建省电力有限公司 | Sampling method for boiler furnace flue gas |
| CN105413458A (en) * | 2015-12-24 | 2016-03-23 | 哈尔滨锅炉厂有限责任公司 | Membrane-type wall tube screen smoke exhaust port and flue gas mixing method |
| CN106644612A (en) * | 2017-02-27 | 2017-05-10 | 国电科学技术研究院 | Smoke grouping online monitoring system of near wall region of boiler water wall |
| CN112610945A (en) * | 2020-12-04 | 2021-04-06 | 华能国际电力股份有限公司德州电厂 | H in local environment of water-cooled wall of coal-fired boiler2Method and equipment for determining S content |
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| JPH11294708A (en) * | 1998-04-07 | 1999-10-29 | Babcock Hitachi Kk | Life judging method of heat transfer tube |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103513008A (en) * | 2013-09-29 | 2014-01-15 | 广东电网公司电力科学研究院 | Method and system for detecting atmosphere of adhesion wall of combustion boiler |
| CN103513008B (en) * | 2013-09-29 | 2016-06-08 | 广东电网公司电力科学研究院 | Atmosphere of adhesion wall of combustion boiler detection method and system |
| CN105202560A (en) * | 2015-10-26 | 2015-12-30 | 国网福建省电力有限公司 | Sampling method for boiler furnace flue gas |
| CN105413458A (en) * | 2015-12-24 | 2016-03-23 | 哈尔滨锅炉厂有限责任公司 | Membrane-type wall tube screen smoke exhaust port and flue gas mixing method |
| CN105413458B (en) * | 2015-12-24 | 2018-01-05 | 哈尔滨锅炉厂有限责任公司 | Membrane panel smoking mouth device and mixed flue gas method |
| CN106644612A (en) * | 2017-02-27 | 2017-05-10 | 国电科学技术研究院 | Smoke grouping online monitoring system of near wall region of boiler water wall |
| CN112610945A (en) * | 2020-12-04 | 2021-04-06 | 华能国际电力股份有限公司德州电厂 | H in local environment of water-cooled wall of coal-fired boiler2Method and equipment for determining S content |
| CN112610945B (en) * | 2020-12-04 | 2022-08-16 | 华能国际电力股份有限公司德州电厂 | H in local environment of water-cooled wall of coal-fired boiler 2 Method and equipment for determining S content |
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Application publication date: 20120718 |