CN112648611B - Comprehensive treatment method for coking and reducing atmosphere of side wall of hedging coal-fired boiler - Google Patents
Comprehensive treatment method for coking and reducing atmosphere of side wall of hedging coal-fired boiler Download PDFInfo
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- CN112648611B CN112648611B CN202011285338.8A CN202011285338A CN112648611B CN 112648611 B CN112648611 B CN 112648611B CN 202011285338 A CN202011285338 A CN 202011285338A CN 112648611 B CN112648611 B CN 112648611B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C5/00—Disposition of burners with respect to the combustion chamber or to one another; Mounting of burners in combustion apparatus
- F23C5/08—Disposition of burners
- F23C5/28—Disposition of burners to obtain flames in opposing directions, e.g. impacting flames
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
- F23C7/02—Disposition of air supply not passing through burner
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Abstract
The invention provides a comprehensive treatment method for coking and reducing atmosphere of a side wall of a flushing coal-fired boiler, which reduces diffusion and flushing of primary air pulverized coal airflow to the left side wall and the right side wall by offsetting burner nozzles close to the left side wall and the right side wall into a hearth by a certain angle, so that the risks of coking and high-temperature corrosion of the water-cooled wall of the side wall are reduced, the water-cooled wall of the side wall is effectively protected, and the safety is improved.
Description
Technical Field
The invention relates to the technical field of coking and high-temperature corrosion of a side wall of a hedging coal-fired boiler, in particular to a comprehensive treatment method for coking and reducing atmosphere of the side wall of the hedging coal-fired boiler.
Background
The method is characterized in that the research and treatment of side wall water-cooled wall coking and high-temperature corrosion existing in the opposed coal-fired boiler have been carried out for many years, wherein the method for relieving the side wall water-cooled wall coking is mainly carried out by modifying a burner structure, enhancing combustion in the boiler and adding wall-attached air at two sides of the burner and adding wall-attached air at the side wall; the method for relieving the high-temperature corrosion of the water-cooled wall of the side wall mainly prevents reducing gas and H from being sprayed by adding wall-attached air to two sides of a combustor, adding wall-attached air or wall-attached air caps to the side wall and spraying the water-cooled wall2S and other corrosive gases are close to the wall surface of the water wall, but in the relieving mode, adherent wind still has the problems of insufficient protection range and influence on the use function due to nozzle coking, and the corrosion-resistant and wear-resistant coating also has the problem of periodicity of protection.
Disclosure of Invention
Aiming at the problems, the invention provides a comprehensive treatment method for coking and reducing atmosphere of a side wall of a hedging coal-fired boiler, which can reduce the risks of coking and high-temperature corrosion of a side wall water-cooled wall, effectively protect the side wall water-cooled wall and improve the safety.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for the comprehensive treatment of coking and reducing atmosphere of a side wall of a hedging coal-fired boiler is characterized by comprising the following steps: which comprises the following steps:
s1, arranging a plurality of combustion layers in a hearth of a boiler, wherein a front wall and a rear wall which are opposite to each other are respectively communicated with an air channel through secondary air bellows, burner nozzles are arranged at intervals in the secondary air bellows of the layer in the combustion layer of the same layer so as to be sprayed into the hearth through the burner nozzles, and wall-attached air at the same height on the front wall and the rear wall is symmetrically arranged;
s2, during furnace shutdown maintenance, in the combustion layer on the same layer, adjusting the installation angles of the burner nozzles which are respectively positioned on the left side wall and the right side wall and are symmetrically opposite, namely, the two burner nozzles which are positioned on the left side wall and are symmetrically opposite deflect a certain deflection angle alpha towards the right side wall along the vertical direction, and the two burner nozzles which are positioned on the right side wall and are symmetrically opposite deflect a certain deflection angle alpha towards the left side wall along the vertical direction;
s3, sealing gaps between the air ports formed after the burner nozzles deflect and the corresponding wall bodies by using a pouring material;
s4, in a cold state, carrying out an in-furnace cold state dynamic field test through an adherence wind speed test method or a firework tracing method to observe whether the airflow of the deflected burner nozzle has the condition of obliquely scouring two side walls, repeating the step S2 on the deflected burner nozzle if the airflow of the deflected burner nozzle has the condition of obliquely scouring the two side walls, and carrying out a primary air flow attenuation characteristic test on the deflected burner nozzle if the airflow of the deflected burner nozzle has no condition of obliquely scouring the two side walls to determine a proper primary air speed V0 so as to ensure that the airflow facing the burner nozzle beside the burner nozzle is not influenced;
s5, carrying out a primary air volume adjusting test again in a thermal state, determining a proper primary air speed V1, ensuring no combustion deflection, and then actually measuring CO and H by adopting an online flue gas monitoring system in a furnace water-cooled wall area or a water-cooled wall reducing atmosphere measuring point2Whether S is at a lower level or not is verified to verify the effect of the burner after deflection is carried out, if the actual measurement of CO and H is carried out2S is at a lower level in the industry, the adjusted deflection angle is proper; if measured, CO and H2And S, if the effect is not good, readjusting the deflection angle alpha, and repeating the step S2 until the deflection angle alpha with the best effect is obtained.
It is further characterized in that:
in the step S1, 4-8 burner nozzles are arranged at intervals in the secondary air bellow of the layer in the combustion layer of the same layer;
in step S2, the deflection angle α is 5 ° to 15 °.
The invention has the advantages that the diffusion and the scouring of primary air pulverized coal airflow to the left side wall and the right side wall are reduced by offsetting the burner nozzles close to the left side wall and the right side wall to a certain angle in the hearth, so that the risks of coking and high-temperature corrosion of the side wall water-cooled wall are reduced, the side wall water-cooled wall is protected, the safety is improved, and the invention has better economic use value.
Drawings
Fig. 1 is a schematic view of the arrangement of the present invention.
Detailed Description
As shown in figure 1, the method for the comprehensive treatment of the coking and reducing atmosphere of the side wall of the opposed coal-fired boiler comprises the following steps:
s1, generally, the boiler body 1 comprises a front wall 2, a rear wall 3, a left side wall 4 and a right side wall 5, the front wall 2 and the rear wall 3 are arranged oppositely, the left side wall 4 and the right side wall 5 are arranged oppositely, a plurality of combustion layers are arranged in a hearth 6 of the boiler, the front wall 2 and the rear wall 3 which are opposite are respectively communicated with an air duct (not shown in the figure) through a layer secondary air bellows 7, 6 burner nozzles 8 are arranged in the middle layer secondary air bellows 7 of the same layer combustion layer at intervals so as to be sprayed into the hearth 6 through the burner nozzles 8, and wall-attached air 9 at the same height on the front wall 2 and the rear wall 3 are symmetrically arranged;
s2, performing detailed inspection on the side wall water-cooled wall by using a blowing-out maintenance opportunity, and adjusting the installation angles of the burner nozzles 8 which are respectively positioned at the positions of the left wall 4 and the right wall 5 and are symmetrically opposite to each other in the same layer combustion layer according to the severity of coking and high-temperature corrosion of the side wall water-cooled wall, namely, the two burner nozzles 8 which are positioned at the position of the left wall 4 and are symmetrically opposite to each other deflect a certain deflection angle alpha towards the direction of the right wall 5 along the vertical direction, specifically, the deflection angle alpha is 5-15 degrees, the preferred deflection angle alpha is 10 degrees, the specific deflection angle can be adjusted according to the actual situation, and the two burner nozzles 8 which are positioned at the position of the right wall 5 and are symmetrically opposite to each other deflect a certain deflection angle alpha towards the direction of the left wall 4 along the vertical direction;
s3, sealing gaps between the air ports formed by deflecting the burner nozzles 8 and the corresponding wall bodies by using a pouring material;
s4, in a cold state, namely, an operator can enter the boiler body in an operation state, an in-boiler cold state dynamic field test is carried out through an adherence wind speed test method or a firework tracing method to observe whether the air flow of the deflected burner nozzle 8 has the condition of obliquely scouring two side walls, if the air flow has the condition of obliquely scouring two side walls, the deflected burner nozzle 8 is repeated in the step S2, if the air flow of the deflected burner nozzle 8 does not have the condition of obliquely scouring two side walls, a primary air flow attenuation characteristic test is carried out on the deflected burner nozzle, and a proper primary wind speed V0 is determined to ensure that the air flow facing the burner nozzle beside the burner nozzle is not influenced, namely, the air flow sprayed by the deflected burner nozzle 8 is prevented from scouring to a burner nozzle facing the adjacent burner nozzle 8, for example, the air flow sprayed by the deflected burner nozzle 8 on the front wall 2 side is prevented from scouring to a burner nozzle facing the adjacent burner nozzle 8 on the rear wall 3 side A gas stream;
s5, carrying out a primary air volume adjustment test again in a thermal state, namely in a boiler working state, determining a proper primary air speed V1, ensuring no combustion deflection, and then actually measuring CO and H by adopting an online flue gas monitoring system of a water wall area in the boiler or a reducing atmosphere measuring point of the water wall2Whether S is at a lower level or not is verified to verify the effect of the burner after deflection is carried out, if the actual measurement of CO and H is carried out2S is at a lower level in the industry, the adjusted deflection angle is proper, the risks of coking and high-temperature corrosion of the side wall water-cooled wall can be reduced, and the side wall water-cooled wall is effectively protected; if measured, CO and H2And if the effect of S is not good, readjusting the deflection angle alpha, repeating the step S2 until the deflection angle alpha with the best effect is obtained, and reducing the risk of coking and high-temperature corrosion of the side wall water-cooled wall and effectively protecting the side wall water-cooled wall by obtaining the best deflection angle alpha and the best deflection angle alpha.
The above test method and system are both the existing methods and systems, and are not described in detail.
According to the invention, the burner nozzles 8 close to the left side wall 4 and the right side wall 5 are deviated into the hearth 6 by a certain angle, so that the diffusion and the scouring of primary air pulverized coal airflow to the left side wall 4 and the right side wall 5 are reduced, the risks of coking and high-temperature corrosion of the side wall water-cooled wall are reduced, the side wall water-cooled wall is protected, the safety is improved, and the burner has a good economic use value.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (3)
1. A method for the comprehensive treatment of coking and reducing atmosphere of a side wall of a hedging coal-fired boiler is characterized by comprising the following steps: which comprises the following steps:
s1, arranging a plurality of combustion layers in a hearth of a boiler, wherein a front wall and a rear wall which are opposite to each other are respectively communicated with an air channel through secondary air bellows, burner nozzles are arranged at intervals in the secondary air bellows of the layer in the combustion layer of the same layer so as to be sprayed into the hearth through the burner nozzles, and wall-attached air at the same height on the front wall and the rear wall is symmetrically arranged;
s2, during furnace shutdown maintenance, in the combustion layer on the same layer, adjusting the installation angles of the burner nozzles which are respectively positioned on the left side wall and the right side wall and are symmetrically opposite, namely, the two burner nozzles which are positioned on the left side wall and are symmetrically opposite deflect a certain deflection angle alpha towards the right side wall along the vertical direction, and the two burner nozzles which are positioned on the right side wall and are symmetrically opposite deflect a certain deflection angle alpha towards the left side wall along the vertical direction;
s3, sealing gaps between the air ports formed after the burner nozzles deflect and the corresponding wall bodies by using a pouring material;
s4, in a cold state, carrying out an in-furnace cold state dynamic field test through an adherence wind speed test method or a firework tracing method to observe whether the airflow of the deflected burner nozzle has the condition of obliquely scouring two side walls, repeating the step S2 on the deflected burner nozzle if the airflow of the deflected burner nozzle has the condition of obliquely scouring the two side walls, and carrying out a primary air flow attenuation characteristic test on the deflected burner nozzle if the airflow of the deflected burner nozzle has no condition of obliquely scouring the two side walls to determine a proper primary air speed V0 so as to ensure that the airflow facing the burner nozzle beside the burner nozzle is not influenced;
s5, carrying out a primary air volume adjusting test again in a thermal state, determining a proper primary air speed V1, ensuring no combustion deflection, and then actually measuring CO and H by adopting an online flue gas monitoring system in a furnace water-cooled wall area or a water-cooled wall reducing atmosphere measuring point2Whether S is at a lower level or not is verified to verify the effect of the burner after deflection is carried out, if the actual measurement of CO and H is carried out2S is at a lower level in the industry, the adjusted deflection angle is proper; if measured, CO and H2And S, if the effect is not good, readjusting the deflection angle alpha, and repeating the step S2 until the deflection angle alpha with the best effect is obtained.
2. The method for the comprehensive treatment of the coking and reducing atmosphere of the side wall of the opposed coal-fired boiler according to claim 1, which is characterized in that: in the step S1, 4-8 burner nozzles are arranged at intervals in the secondary air wind boxes of the same layer in the combustion layer.
3. The method for the comprehensive treatment of the coking and reducing atmosphere of the side wall of the opposed coal-fired boiler according to claim 1, which is characterized in that: in step S2, the deflection angle α is 5 ° to 15 °.
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| CN202011285338.8A CN112648611B (en) | 2020-11-17 | 2020-11-17 | Comprehensive treatment method for coking and reducing atmosphere of side wall of hedging coal-fired boiler |
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| CN202011285338.8A CN112648611B (en) | 2020-11-17 | 2020-11-17 | Comprehensive treatment method for coking and reducing atmosphere of side wall of hedging coal-fired boiler |
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| CN112648611B true CN112648611B (en) | 2022-04-19 |
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| CN113137625A (en) * | 2021-04-15 | 2021-07-20 | 苏州西热节能环保技术有限公司 | Method for relieving high-temperature corrosion of cold ash bucket of tangential firing boiler |
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| CN103438437A (en) * | 2013-07-30 | 2013-12-11 | 国电科学技术研究院 | Adherence air system of front and back wall opposed firing boiler |
| CN104595891A (en) * | 2015-01-21 | 2015-05-06 | 西安热工研究院有限公司 | Opposed firing structure of boiler |
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| CN109990268A (en) * | 2019-03-22 | 2019-07-09 | 华中科技大学 | A kind of uniform supercritical CO of thermic load2Opposite-flushing type boiler furnace structure |
| CN111256111A (en) * | 2020-03-30 | 2020-06-09 | 西安热工研究院有限公司 | Efficient wall-attached air system and method for preventing water-cooled wall from high-temperature corrosion of front-wall and rear-wall opposed combustion boiler |
| CN111442259A (en) * | 2020-04-01 | 2020-07-24 | 华中科技大学 | Front and back wall opposed boiler |
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2020
- 2020-11-17 CN CN202011285338.8A patent/CN112648611B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103438437A (en) * | 2013-07-30 | 2013-12-11 | 国电科学技术研究院 | Adherence air system of front and back wall opposed firing boiler |
| CN104595891A (en) * | 2015-01-21 | 2015-05-06 | 西安热工研究院有限公司 | Opposed firing structure of boiler |
| CN205102117U (en) * | 2015-10-28 | 2016-03-23 | 国电科学技术研究院 | Combination adherence wind system of front and back wall opposed firing boiler all |
| CN108266721A (en) * | 2018-01-12 | 2018-07-10 | 东方电气集团东方锅炉股份有限公司 | Boiler-burner arrangement |
| CN109990268A (en) * | 2019-03-22 | 2019-07-09 | 华中科技大学 | A kind of uniform supercritical CO of thermic load2Opposite-flushing type boiler furnace structure |
| CN111256111A (en) * | 2020-03-30 | 2020-06-09 | 西安热工研究院有限公司 | Efficient wall-attached air system and method for preventing water-cooled wall from high-temperature corrosion of front-wall and rear-wall opposed combustion boiler |
| CN111442259A (en) * | 2020-04-01 | 2020-07-24 | 华中科技大学 | Front and back wall opposed boiler |
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