CN214370351U - Wall-attached air system for preventing high-temperature corrosion of boiler water-cooled wall - Google Patents
Wall-attached air system for preventing high-temperature corrosion of boiler water-cooled wall Download PDFInfo
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- CN214370351U CN214370351U CN202023156082.9U CN202023156082U CN214370351U CN 214370351 U CN214370351 U CN 214370351U CN 202023156082 U CN202023156082 U CN 202023156082U CN 214370351 U CN214370351 U CN 214370351U
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Abstract
A wall-attached air system for preventing high-temperature corrosion of a water-cooled wall of a boiler comprises a hearth, wherein the side wall of the hearth consists of a first side wall, a second side wall, a third side wall and a fourth side wall, the first side wall and the third side wall are arranged oppositely, and the second side wall and the fourth side wall are arranged oppositely; a plurality of layers of burners are arranged on the first side wall and the third side wall along the height direction; two first air pipes are uniformly arranged on the second side wall and the fourth side wall at the same height with each layer of combustor, and first nozzles of the two first air pipes are respectively opposite to the first side wall and the third side wall; a plurality of second air pipes are arranged on the side wall of the hearth along the height direction of the hearth, four second air pipes are arranged at the same height of the hearth, and the four second air pipes are respectively arranged on the four side walls of the hearth; the first air pipes and the second air pipes are alternately arranged along the height direction of the hearth. The utility model discloses the adherence wind that forms can protect the wall not to corrode to make the inside air current of furnace mix more evenly, the burning is more abundant.
Description
Technical Field
The utility model belongs to the boiler structure, concretely relates to prevent adherence wind system of boiler water wall high temperature corrosion.
Background
As the requirements of China on the economy and the environmental protection of the thermal power industry are continuously improved, the boiler gradually changes to a high-capacity low-NO boilerxDirection of combustion is modified to ensure NO in boilerxThe emission concentration reaches the national environmental protection standard. The increase of the boiler capacity leads the temperature of the water-cooled wall to be gradually increased, and the NO is lowxThe combustion technology causes the surrounding reductive gas atmosphere of the water-cooled wall to be aggravated, and causes the high-temperature corrosion of the water-cooled wall, thereby seriously influencing the safe and economic operation of the boiler.
The phenomenon that the material undergoes chemical or electrochemical reaction with an environmental medium at high temperature, resulting in the deterioration of the material is called high-temperature corrosion. Such corrosion includes high temperature oxidation, sulfide corrosion, molten salt corrosion, dew point corrosion, and the like. Domestic supercritical opposite-impact direct-current boiler using low NOxAfter combustion technology, severe sulfide corrosion occurred on the four water walls.
The influencing factors of the high-temperature corrosion of the water-cooled wall of the boiler mainly comprise the following factors: (1) the fire coal contains certain contents of substances which can generate high-temperature corrosion, such as S, CL, K, Na and the like; (2) the temperature of the hearth in the burner area is high; (3) a reducing atmosphere and corrosive gases appear near the water-cooled wall; (4) the corrosive gas stream (or particulate matter) comes into direct contact with the waterwall tubes. The prevention measures of the high-temperature corrosion commonly used at present comprise the following aspects of (1) optimizing the operation of a boiler; (2) water-cooled wall pipe modification; (3) water cooling wall surface treatment and the like. However, the improvement effects of the measures are not ideal, the problems of regular furnace shutdown maintenance, high manufacturing cost and the like exist, and the problem of high-temperature corrosion of the water-cooled wall cannot be thoroughly solved.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a prevent adherence wind system of boiler water wall high temperature corrosion to solve boiler water wall high temperature corrosion's problem, improve the security of boiler operation.
In order to achieve the above object, the utility model adopts the following technical scheme: an adherence air system for preventing high-temperature corrosion of a boiler water wall comprises a hearth, wherein the side wall of the hearth consists of a first side wall, a second side wall, a third side wall and a fourth side wall, the first side wall and the third side wall are oppositely arranged, and the second side wall and the fourth side wall are oppositely arranged; a plurality of layers of burners are arranged on the first side wall and the third side wall along the height direction; two first air pipes are uniformly arranged on the second side wall and the fourth side wall at the same height with each layer of combustor, and first nozzles of the two first air pipes at the same height are respectively opposite to the first side wall and the third side wall; a plurality of second air pipes are arranged on the side wall of the hearth along the height direction of the hearth, four second air pipes are arranged at the same height of the hearth, and the four second air pipes are respectively arranged on the four side walls of the hearth; the first air pipes and the second air pipes are alternately arranged along the height direction of the hearth.
In the scheme, on one hand, airflow ejected by the first air pipe which is at the same height as the combustor flows back to form a stable wall-attached air layer after impacting the side wall of the hearth, so that high-temperature corrosion of the water-cooled wall is isolated; on the other hand, airflow ejected by the second air pipes arranged in a staggered manner with the burners forms adherence air layers on the four side walls of the hearth, so that the water-cooled wall is protected from high-temperature corrosion.
Preferably, four second air pipes at the same height of the furnace are arranged on four side walls of the furnace in a central symmetry manner, and a second nozzle of each second air pipe is in the same straight line with the second air pipe.
Preferably, four second air pipes at the same height of the hearth are respectively arranged at the end parts of four side walls of the hearth.
Preferably, a first air pipe controller is arranged in the first air pipe, and a second air pipe controller is arranged in the second air pipe.
Preferably, the baffle plates are arranged at the four corners of the hearth and at the positions corresponding to the first nozzles of the first air pipes, so that air flow sprayed by the first air pipes can better flow back to form a stable adherent air layer.
Preferably, the gas atmosphere detectors are respectively arranged at the positions, at the same height as the first air pipe, on the second side wall and the fourth side wall and at the same height as the second air pipe on the side wall of the hearth.
The utility model has the advantages that: the utility model adopts a backflow mode wall-attached air system at the same height with the cyclone burner to form a stable and effective wall-attached air layer, reduce the reducing atmosphere and fundamentally isolate the high-temperature corrosion of the water wall; the wall-attached air system with the tangential circles at four corners is adopted at a position which is not at the same height with the cyclone burner, four air flows sent by the four second air pipes at the same height form wall-attached air to protect the wall surface from being corroded, the air flows in the hearth are mixed more uniformly and are combusted more fully, and the production efficiency is improved.
Drawings
Fig. 1 is a schematic diagram of an embodiment of the present invention;
FIG. 2 is a cross-sectional view A-A of FIG. 1;
fig. 3 is a sectional view B-B of fig. 1.
Detailed Description
The present invention will be further explained with reference to the drawings and examples.
The utility model provides a prevent adherence wind system of boiler water-cooled wall high temperature corrosion, includes furnace 1, cyclone burner 2, first tuber pipe 3, first tuber pipe controller 3.1, first spout 3.2, second tuber pipe 4, second tuber pipe controller 4.2, second spout 4.1, baffle 5, gas atmosphere detector 6.
The hearth 1 comprises four side walls, namely a first side wall and a third side wall which are oppositely arranged, and a second side wall and a fourth side wall which are oppositely arranged. The cyclone burners 2 are symmetrically distributed on the first side wall and the third side wall of the hearth 1, and five layers, four in each layer, are arranged on the two side walls. The first air pipes 3 and the second air pipes 4 are alternately arranged along the height direction of the hearth 1, and air sources are all preheated secondary air. The wall-attached air system in the embodiment can be divided into a backflow wall-attached air system and a four-corner tangential wall-attached air system.
The backflow adherence air system is shown in fig. 2 and comprises a first air pipe 3, a first air pipe controller 3.1, a first nozzle 3.2, a baffle 5 and a gas atmosphere detector 6, wherein the baffle 5 is arranged at four corners of a hearth 1. When the boiler operates, the first air pipes 3 are symmetrically arranged on the second side wall and the fourth side wall of the hearth 1, five layers of the first air pipes 3 are arranged on each side wall, each layer is located at the same height with the corresponding cyclone burner 2, two layers are arranged on each layer, and gas is respectively emitted to the first side wall and the third side wall at the same height from the middle of the side walls. Hot overgrate air is spout from first tuber pipe 3, the air current that forms strikes on baffle 5 and to the second lateral wall, the inboard of fourth lateral wall circles round, form the gas reflux protective layer, the gas atmosphere and the gas velocity of flow of gas atmosphere detector 6 detectable wall, first tuber pipe controller 3.1 sets up in first tuber pipe 3 for control hot overgrate air's blowout speed, thereby the direction of the adjustable angle control air current of first spout 3.2, both control hot overgrate air according to the testing result of gas atmosphere detector 6.
The four-corner tangential wall-attached air system is shown in fig. 3 and comprises a second air pipe 4, a second air pipe controller 4.2, a second nozzle 4.1 and a gas atmosphere detector 6. The second air pipes 4 and the cyclone burners 2 are arranged in a staggered manner, each layer is respectively arranged on four side walls of the hearth 1, and the emitted air forms a tangent circle at the same height. When the boiler operates, four air flows are emitted from the second air pipes 4 on the four side walls at the same height to form a tangent circle, and the four air flows form wall-attached air on the peripheral wall surfaces to protect the wall surfaces from being corroded, so that the air flows in the boiler are mixed more uniformly and are combusted more fully. The gas atmosphere and the gas velocity of flow of gas atmosphere detector 6 detectable wall, second tuber pipe controller 4.1 sets up in second tuber pipe 4 for the blowout speed of control heat overgrate air, thereby the angle of the adjustable spout of second spout 4.2 is regulated and control the four corners tangent circle size that the air current formed, and both control heat overgrate air according to the testing result of gas atmosphere detector 6.
Claims (6)
1. An adherence air system for preventing high-temperature corrosion of a boiler water wall comprises a hearth (1), wherein the side wall of the hearth consists of a first side wall, a second side wall, a third side wall and a fourth side wall, the first side wall and the third side wall are oppositely arranged, and the second side wall and the fourth side wall are oppositely arranged; a multi-layer combustor (2) is arranged on the first side wall and the third side wall along the height direction; the device is characterized in that two first air pipes (3) are uniformly arranged at the same height positions of the second side wall and the fourth side wall as each layer of combustor (2), and first nozzles (3.2) of the two first air pipes (3) at the same height are respectively opposite to the first side wall and the third side wall; a plurality of second air pipes (4) are arranged on the side wall of the hearth (1) along the height direction of the hearth, four second air pipes (4) are arranged on the same height of the hearth, and the four second air pipes (4) are respectively arranged on the four side walls of the hearth (1); the first air pipes (3) and the second air pipes (4) are alternately arranged along the height direction of the hearth (1).
2. An adherent air system according to claim 1, wherein four second air ducts (4) at the same height of the hearth (1) are arranged centrosymmetrically on four side walls of the hearth (1), and the second nozzle (4.1) of each second air duct (4) is in the same line with the second air duct (4).
3. An adherent air system according to claim 1 or 2, wherein four second air ducts (4) at the same height of the hearth (1) are arranged at the ends of the four side walls of the hearth (1), respectively.
4. An adherent wind system according to claim 1, wherein a first wind pipe controller (3.1) is provided within the first wind pipe (3) and a second wind pipe controller (4.2) is provided within the second wind pipe (4).
5. An adherent air system according to claim 1, wherein baffles (5) are arranged at the four corners of the furnace chamber (1) corresponding to the first nozzles (3.2) of the first air duct (3).
6. An adherent wind system according to claim 1, wherein gas atmosphere detectors (6) are arranged on the second and fourth side walls at the same level as the first wind duct (3) and on the side walls of the furnace chamber (1) at the same level as the second wind duct (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023156082.9U CN214370351U (en) | 2020-12-24 | 2020-12-24 | Wall-attached air system for preventing high-temperature corrosion of boiler water-cooled wall |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023156082.9U CN214370351U (en) | 2020-12-24 | 2020-12-24 | Wall-attached air system for preventing high-temperature corrosion of boiler water-cooled wall |
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| CN214370351U true CN214370351U (en) | 2021-10-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202023156082.9U Active CN214370351U (en) | 2020-12-24 | 2020-12-24 | Wall-attached air system for preventing high-temperature corrosion of boiler water-cooled wall |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114484463A (en) * | 2022-01-17 | 2022-05-13 | 河南省锅炉压力容器安全检测研究院 | Device for preventing high-temperature corrosion of heating surface of waste incineration boiler |
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2020
- 2020-12-24 CN CN202023156082.9U patent/CN214370351U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114484463A (en) * | 2022-01-17 | 2022-05-13 | 河南省锅炉压力容器安全检测研究院 | Device for preventing high-temperature corrosion of heating surface of waste incineration boiler |
| CN114484463B (en) * | 2022-01-17 | 2022-09-02 | 河南省锅炉压力容器安全检测研究院 | Device for preventing high-temperature corrosion of heating surface of waste incineration boiler |
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