CN113339784B - Prevention and control system and method for high-temperature corrosion of water wall of power station boiler - Google Patents

Prevention and control system and method for high-temperature corrosion of water wall of power station boiler Download PDF

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CN113339784B
CN113339784B CN202110476783.0A CN202110476783A CN113339784B CN 113339784 B CN113339784 B CN 113339784B CN 202110476783 A CN202110476783 A CN 202110476783A CN 113339784 B CN113339784 B CN 113339784B
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layer
combustor
primary air
side wall
channel
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CN113339784A (en
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王帅
李学飞
肖冠华
徐春兴
颜喜
王永佳
王泽民
王凯
路昆
张庆国
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Huadian Electric Power Research Institute Co Ltd
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Huadian Electric Power Research Institute Co Ltd
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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
    • 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
    • F23C5/02—Structural details of mounting
    • F23C5/06—Provision for adjustment of burner position during operation
    • 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
    • F23C7/008—Flow control devices
    • 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 
    • F23C2201/00—Staged combustion
    • F23C2201/10—Furnace staging
    • F23C2201/102—Furnace staging in horizontal direction
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Supply (AREA)

Abstract

The invention discloses a system and a method for preventing and controlling high-temperature corrosion of a water wall of a power station boiler, which comprise an A-layer combustor, a B-layer combustor, a C-layer combustor, a D-layer combustor, an E-layer combustor and an F-layer combustor; the layer B combustor, the layer C combustor, the layer D combustor and the layer E combustor are arranged on the upper portion of the hearth, the layer B combustor, the layer C combustor, the layer D combustor and the layer E combustor respectively comprise a novel direct-current combustor and a traditional cyclone combustor, the novel direct-current combustor is arranged at a position close to a left side wall water-cooled wall and a right side wall water-cooled wall, and the traditional cyclone combustor is arranged between the novel direct-current combustors; the layer A burner and the layer F burner are arranged at the lower part of the hearth, and the layer A burner and the layer F burner comprise a traditional cyclone burner. The invention has simple structure and easy implementation, does not need great technical improvement on the prior large-capacity unit, and does not influence the combustion stability in the boiler and the boiler efficiency.

Description

System and method for preventing and controlling high-temperature corrosion of water wall of power station boiler
Technical Field
The invention relates to a prevention and control system and a method for high-temperature corrosion of a water wall of a power station boiler.
Background
High parameter with high capacity along with boilerThe development and domestic quality of electric coal are continuously reduced, the problem of high-temperature corrosion of water-cooled walls generally occurs in large boilers adopting low-nitrogen combustion technology, and the high-temperature corrosion of the water-cooled walls of the side walls of the front and rear wall opposed firing boilers is particularly serious. The high-temperature corrosion can cause the wall thickness reduction and the strength reduction of the water-cooled wall, so that sudden tube explosion is easily caused, the emergency shutdown and rush repair are caused, and the enterprise benefit is directly influenced; and the water wall with serious high-temperature corrosion is replaced in a large area during the maintenance, the material is consumed, the maintenance time is prolonged, and huge economic loss is brought. High-temperature corrosion is a relatively complicated physicochemical process, and is generally classified into sulfate-type high-temperature corrosion, sulfide-type high-temperature corrosion, chloride-type high-temperature corrosion, and high-temperature corrosion caused by reducing gas, depending on the type of high-temperature corrosion product and the cause of corrosion explosion. The coal quality in China has high sulfur content and extremely low chlorine content, and researches show that the high-temperature corrosion of the water-cooled wall belongs to a sulfide type and a sulfate type, and the sulfide type is taken as the main material. The influence factors of the high-temperature corrosion of the water-cooled wall mainly include: coal quality, reducing atmosphere of a corrosion area, near-wall combustion of coal powder and water cooling wall temperature. The lower the volatile component of the coal is, the higher the sulfur content is, and the coarser the coal powder is, the more susceptible the high-temperature corrosion is to occur; the coal powder is burnt under the anoxic condition to generate reducing gases such as CO and the like to form reducing atmosphere, H 2 S and CO concentrations are linear, with increasing CO, H 2 The content of S is rapidly increased, and high-temperature corrosion is accelerated; the coal dust wall brushing causes the surface temperature of the water-cooled wall to be high, and causes corrosion products to continuously fall off to aggravate high-temperature corrosion; the wall temperature of the water wall tube is within the range of 400-500 ℃, the wall temperature is improved by 50 ℃, and the high-temperature corrosion rate is doubled.
The high-temperature corrosion area of the water-cooled wall of the opposed firing boiler is mainly characterized in that the water-cooled wall of the side wall is a middle area along the depth direction of a hearth, and an area from an upper burner to an over-fire air area along the height direction of the hearth. The main reasons are two reasons: 1) The opposed firing mode is met in the middle of the hearth and flows to the side wall, the airflow close to the end burner nozzle of the side wall is directly extruded to the side wall, and partial pulverized coal airflow is directly scoured to the middle area of the side wall; 2) The secondary air box structure with air inlet at two sides causes that the secondary air quantity of the combustor close to the side wall area is seriously insufficient, the side wall area has serious reducing atmosphere, the smoke temperature of the area is highest, and serious high-temperature corrosion exists. At present, the technical measures for preventing and treating the high-temperature corrosion of the water-cooled wall of the opposed combustion boiler mainly comprise four types: 1) Controlling the fuel quality; 2) Optimizing the reducing atmosphere in the furnace; 3) Reducing the temperature of the tube wall; 4) Improve the corrosion resistance of the heating surface. Reducing the sulfur content of the coal as fired is the most effective method for reducing sulfide type high-temperature corrosion, but the measure is difficult to be effectively implemented in view of the current situation of unstable coal supply and fuel cost in China; the fineness of the coal dust is reduced, the high-temperature corrosion degree caused by the fact that larger coal dust particles scour and tear a water-cooled wall oxide film can be reduced, and the power consumption of the coal mill is increased. More and more power generation enterprises adopt the mode of installing the wall-mounted wind to improve the oxygen content near the water-cooled wall, reduce the appearance of reducing atmosphere, but this measure can reduce the efficiency of boiler, and it is big to reform transform work load, and system configuration is complicated, and the air quantity is wayward in actual operation. The reduction of the wall temperature of the water wall can only be controlled in a mode of reducing heat transfer deterioration, such as timely cleaning of accumulated ash and coking on a heated surface, but the measure needs to be carried out after furnace shutdown, so that the timeliness is poor and the effect is not obvious. The method for improving the corrosion resistance of the heating surface mainly comprises hot spraying and overlaying welding technologies, but the hot spraying has short service life and high requirement on the spraying technology; the overlay welding technology is applied more in the United states, but the technical requirement and the manufacturing cost are too high, and the overlay welding technology is difficult to popularize in China.
In summary, no high-temperature corrosion prevention and control technology with low cost, reliable performance and excellent effect exists at present, and the problem of high-temperature corrosion of the side wall water-cooled wall of the opposed combustion boiler can be fundamentally solved.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a system and a method for preventing and controlling high-temperature corrosion of a water-cooled wall of a power station boiler, which can not only fundamentally improve the problem that airflow at a nozzle of an end burner is extruded to a side wall, but also realize the good effect of 'wind powder coating', effectively supplement the air quantity of a near side wall area and greatly improve the reducing atmosphere of the near side wall area.
The technical scheme adopted by the invention for solving the problems is as follows: a prevention and control system for high-temperature corrosion of a water-cooled wall of a power station boiler comprises a front wall water-cooled wall, a rear wall water-cooled wall, a left side wall water-cooled wall and a right side wall water-cooled wall which are positioned around a hearth, and is characterized by further comprising an A-layer combustor, a B-layer combustor, a C-layer combustor, a D-layer combustor, an E-layer combustor and an F-layer combustor; the B-layer combustor, the C-layer combustor, the D-layer combustor and the E-layer combustor are arranged at the upper part of the hearth, and all the B-layer combustor, the C-layer combustor, the D-layer combustor and the E-layer combustor comprise a novel direct-current combustor and a traditional cyclone combustor, the novel direct-current combustor is arranged at a position close to a left side wall water-cooled wall and a right side wall water-cooled wall, and the traditional cyclone combustor is arranged between the novel direct-current combustors; the layer A burner and the layer F burner are arranged at the lower part of the hearth, and the layer A burner and the layer F burner comprise a traditional cyclone burner.
The novel direct-current combustor is provided with a primary air powder inlet, a primary air powder channel, a hot primary air inlet, a hot primary air channel, a shutter baffle and a combustor swinging head; the primary air powder inlet is communicated with the primary air powder channel, the hot primary air inlet is communicated with the hot primary air channel, the shutter baffle is arranged in the primary air powder channel, and the primary air powder channel and the hot primary air channel extend into the burner swing head.
The cross section of combustor swing head is the rectangle structure, transversely sees from inside, divide into 4 passageways in proper order: the burner swinging head can swing inwards along the horizontal direction of the cross section of the hearth, and the swinging range is 0-40 degrees; and the furnace also can swing up and down along the height direction of the furnace, and the swing range is-30 degrees to +30 degrees. The hot primary air channel is provided with an elbow structure, the angle of the elbow structure is 90 degrees, and the direction of the elbow structure faces the inner side of the hearth. The front end of the primary air powder channel is positioned in the hot primary air channel and forms a coaxial sleeve structure with the hot primary air channel, and the rear end of the primary air powder channel penetrates out of the elbow structure of the hot primary air channel.
Furthermore, a hot primary air inlet is connected with an outlet hot primary air main pipe of the air preheater, direct-current hot primary air enters the hearth, the rigidity is high, the firing range is long, and the hot primary air can reach the middle area of the side wall.
Furthermore, the shutter baffle comprises a plurality of blocks, and the plurality of shutter baffles have different inclination angles, so that the effect of horizontal shade separation is achieved.
Furthermore, the group number of the A-layer combustor, the B-layer combustor, the C-layer combustor, the D-layer combustor, the E-layer combustor and the F-layer combustor is the same, and the groups are respectively 6 or 8.
Furthermore, the part of the hot primary air channel extending into the burner swing head forms a high-speed hot primary air channel and a low-speed hot primary air channel, the high-speed hot primary air channel is close to the left wall water-cooled wall or the right wall water-cooled wall, and the low-speed hot primary air channel is far away from the left wall water-cooled wall or the right wall water-cooled wall.
Furthermore, the part of the primary air-powder channel extending into the burner swing head forms a light primary air-powder channel and a thick primary air-powder channel, the light primary air-powder channel is close to the left side wall water-cooled wall or the right side wall water-cooled wall, and the thick primary air-powder channel is far away from the left side wall water-cooled wall or the right side wall water-cooled wall.
The working method of the prevention and control system for the high-temperature corrosion of the water wall of the power station boiler comprises the following steps:
the method comprises the following steps: respectively arranging a group of novel direct-current combustors close to a left side wall water-cooled wall and a right side wall water-cooled wall in the B-layer combustor, the C-layer combustor, the D-layer combustor and the E-layer combustor, and arranging traditional cyclone combustors among the novel direct-current combustors;
step two: by the aid of the shutter baffle, horizontal shade separation of primary air carrying pulverized coal at an outlet of a primary air-powder channel is realized, the powder quantity of a channel on a near side wall is high, and the powder quantity of a far side wall is low; by utilizing the function of an elbow structure, hot primary air led out from an outlet main pipe of the air preheater realizes the distribution of air quantity at the outlet of a hot primary air channel, the air quantity of a channel on a near side wall is high, and the air quantity of a position on a far side wall is low;
step three: the burner swinging head swings inwards along the horizontal direction of the cross section of the hearth to adjust the high-temperature corrosion prevention and control effect, and swings up and down along the height direction of the hearth to adjust the central height of flame;
step four: an oxygen-rich area, a light powder area, a thick powder area and a afterburning area are sequentially formed in the direction away from the water-cooled wall of the side wall, so that the dual functions of oxygen supplementation in a high-temperature corrosion area of the water-cooled wall of the side wall and air supplementation in a severe burning area of the thick powder are realized.
Compared with the prior art, the invention has the following advantages and effects:
1) The novel direct-current combustor is adopted, an oxygen-rich area, a light powder area, a thick powder area and a afterburning area are sequentially formed in the direction far away from the water wall of the side wall, and the dual functions of oxygen supplementation in a high-temperature corrosion area of the water wall of the side wall and air supplementation in a severe burning area of the thick powder are realized; the problem that airflow of the nozzle of the end burner is extruded to the side wall can be fundamentally solved, the good effect of wind powder coating can be realized, the air quantity of the near side wall area can be effectively supplemented, and the reducing atmosphere of the near side wall area is greatly improved.
2) The novel direct-current burner can horizontally swing towards the center of the hearth at a certain angle, and is favorable for inhibiting airflow flowing to the side wall after meeting in the middle of the hearth; and the novel direct current burner can swing up and down along the height of the hearth, and can flexibly adjust the flame center of a combustion area to a certain extent.
3) The invention has simple structure and easy implementation, does not need great technical improvement on the prior large-capacity unit, and does not influence the combustion stability in the boiler and the boiler efficiency.
Drawings
Fig. 1 is a schematic view of the burner arrangement of the present invention.
Fig. 2 isbase:Sub>A sectional view taken alongbase:Sub>A-base:Sub>A in fig. 1.
Fig. 3 is a sectional view taken along line B-B in fig. 1.
Fig. 4 is a sectional view taken along line C-C in fig. 2.
In the figure: the novel cyclone burner comprises a front wall water-cooled wall 1, a rear wall water-cooled wall 2, a left side wall water-cooled wall 3, a right side wall water-cooled wall 4, a novel direct-current burner 5, a traditional cyclone burner 6, a layer A burner 7, a layer B burner 8, a layer C burner 9, a layer D burner 10, a layer E burner 11, a layer F burner 12, a burner swinging head 13, a primary air powder inlet 51, a primary air powder channel 52, a shutter baffle 53, a fresh primary air powder channel 54, a concentrated primary air powder channel 55, a hot primary air inlet 61, a hot primary air channel 62, a high-speed hot primary air channel 63 and a low-speed hot primary air channel 64.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit the present invention.
Examples are given.
Referring to fig. 1 to 4, in the embodiment, a prevention and control system for high-temperature corrosion of a water wall of a utility boiler comprises a front wall water-cooled wall 1, a rear wall water-cooled wall 2, a left side wall water-cooled wall 3, a right side wall water-cooled wall 4, an a-layer combustor 7, a B-layer combustor 8, a C-layer combustor 9, a D-layer combustor 10, an E-layer combustor 11 and an F-layer combustor 12, which are located around a hearth; the B-layer combustor 8, the C-layer combustor 9, the D-layer combustor 10 and the E-layer combustor 11 are arranged on the upper portion of the hearth, the B-layer combustor 8, the C-layer combustor 9, the D-layer combustor 10 and the E-layer combustor 11 respectively comprise a novel direct-current combustor 5 and a traditional cyclone combustor 6, the novel direct-current combustor 5 is arranged at a position close to the left side wall water-cooled wall 3 and the right side wall water-cooled wall 4, and the traditional cyclone combustor 6 is arranged between the novel direct-current combustors 5; the layer a burners 7 and the layer F burners 12 are arranged in the lower part of the furnace, and the layer a burners 7 and the layer F burners 12 comprise conventional cyclone burners 6.
The novel direct current combustor 5 is provided with a primary air powder inlet 51, a primary air powder channel 52, a hot primary air inlet 61, a hot primary air channel 62, a shutter baffle 53 and a combustor swinging head 13; the primary air powder inlet 51 is communicated with the primary air powder channel 52, the hot primary air inlet 61 is communicated with the hot primary air channel 62, the shutter 53 is arranged in the primary air powder channel 52, and the primary air powder channel 52 and the hot primary air channel 62 extend into the burner swinging head 13.
The cross section of the burner swinging head 13 is a rectangular structure, and is divided into 4 channels in turn when being seen from the inside: the burner swinging head 13 can swing inwards along the horizontal direction of the cross section of the hearth at the range of 0-40 degrees; and the furnace also can swing up and down along the height direction of the furnace, and the swing range is-30 degrees to +30 degrees. The hot primary air channel 62 is provided with an elbow structure, the angle of the elbow structure is 90 degrees, and the direction of the elbow structure faces the inner side of the hearth. The front end of the primary air-powder channel 52 is located inside the primary hot air channel 62 and forms a coaxial sleeve structure with the primary hot air channel 62, and the rear end of the primary air-powder channel 52 penetrates out of the elbow structure of the primary hot air channel 62.
Specifically, a hot primary air inlet 61 is connected with an outlet hot primary air main pipe of the air preheater, and direct-current hot primary air enters a hearth, so that the hearth is high in rigidity and far in range and can reach the middle area of the side wall. The louver 53 includes a plurality of blocks, and the plurality of louver 53 have different inclination angles, so as to achieve the effect of horizontal shade separation. The number of the burners of the A layer 7, the B layer 8, the C layer 9, the D layer 10, the E layer 11 and the F layer 12 is the same, and the number is respectively 6 or 8. The part of the primary hot air channel 62 extending into the burner swing head 13 forms a high-speed primary hot air channel 63 and a low-speed primary hot air channel 64, the high-speed primary hot air channel 63 is close to the left side wall water-cooled wall 3 or the right side wall water-cooled wall 4, and the low-speed primary hot air channel 64 is far away from the left side wall water-cooled wall 3 or the right side wall water-cooled wall 4. The part of the primary air and powder channel 52 extending into the burner swing head 13 forms a light primary air and powder channel 54 and a thick primary air and powder channel 55, the light primary air and powder channel 54 is close to the left wall water-cooled wall 3 or the right wall water-cooled wall 4, and the thick primary air and powder channel 55 is far away from the left wall water-cooled wall 3 or the right wall water-cooled wall 4.
The working method of the prevention and control system for the high-temperature corrosion of the water wall of the power station boiler comprises the following steps:
the method comprises the following steps: respectively arranging a group of novel direct-current combustors 5 in the B-layer combustor 8, the C-layer combustor 9, the D-layer combustor 10 and the E-layer combustor 11 close to the left side wall water-cooled wall 3 and the right side wall water-cooled wall 4, and arranging traditional cyclone combustors 6 between the novel direct-current combustors 5;
step two: by the action of the shutter 53, horizontal shade separation of primary air carrying coal dust at the outlet of the primary air-powder passage 52 is realized, the powder quantity of the passage on the near side wall is high, and the powder quantity of the passage on the far side wall is low; by utilizing the function of the elbow structure, the hot primary air led out from the outlet main pipe of the air preheater realizes the distribution of air quantity at the outlet of the hot primary air channel 62, the air quantity of the channel on the near side wall is high, and the air quantity at the far side wall is low;
step three: the burner swinging head 13 swings inwards along the horizontal direction of the cross section of the hearth to adjust the high-temperature corrosion prevention and control effect, and the burner swinging head 13 swings upwards and downwards along the height direction of the hearth to adjust the central height of flame;
step four: an oxygen-rich area, a light powder area, a thick powder area and a afterburning area are sequentially formed in the direction away from the water-cooled wall of the side wall, so that the dual functions of oxygen supplementation in a high-temperature corrosion area of the water-cooled wall of the side wall and air supplementation in a severe burning area of the thick powder are realized.
Those not described in detail in this specification are well within the skill of the art.
Although the present invention has been described with reference to the above embodiments, it should be understood that the scope of the present invention is not limited thereto, and that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the present invention.

Claims (3)

1. A prevention and control system for high-temperature corrosion of a water wall of a power station boiler comprises a front wall water wall (1), a rear wall water wall (2), a left side wall water wall (3) and a right side wall water wall (4) which are positioned around a hearth, and is characterized by further comprising an A-layer combustor (7), a B-layer combustor (8), a C-layer combustor (9), a D-layer combustor (10), an E-layer combustor (11) and an F-layer combustor (12); the layer B combustor (8), the layer C combustor (9), the layer D combustor (10) and the layer E combustor (11) are arranged on the upper portion of the hearth, the layer B combustor (8), the layer C combustor (9), the layer D combustor (10) and the layer E combustor (11) respectively comprise a novel direct-current combustor (5) and a traditional cyclone combustor (6), the novel direct-current combustor (5) is arranged at a position close to a left side wall water-cooled wall (3) and a right side wall water-cooled wall (4), and the traditional cyclone combustor (6) is arranged between the novel direct-current combustors (5); the A-layer burner (7) and the F-layer burner (12) are arranged at the lower part of the hearth, and the A-layer burner (7) and the F-layer burner (12) comprise a traditional cyclone burner (6);
the novel direct-current combustor (5) is provided with a primary air powder inlet (51), a primary air powder channel (52), a hot primary air inlet (61), a hot primary air channel (62), a shutter baffle (53) and a combustor swinging head (13); the primary air powder inlet (51) is communicated with the primary air powder channel (52), the hot primary air inlet (61) is communicated with the hot primary air channel (62), the shutter baffle (53) is arranged in the primary air powder channel (52), and the primary air powder channel (52) and the hot primary air channel (62) extend into the burner swing head (13);
the range of the swinging head (13) of the burner swinging head to swing inwards along the horizontal direction of the cross section of the hearth is 0-40 degrees, and the range of the swinging head (13) of the burner swinging head to swing upwards and downwards along the height direction of the hearth is-30 degrees to +30 degrees; the hot primary air channel (62) is provided with an elbow structure, the angle of the elbow structure is 90 degrees, and the direction of the elbow structure faces the inner side of the hearth; the front end of the primary air-powder channel (52) is positioned in the hot primary air channel (62), and the rear end of the primary air-powder channel (52) penetrates out of the elbow structure of the hot primary air channel (62);
the shutter baffle (53) comprises a plurality of blocks, and the plurality of shutter baffles (53) have different inclination angles;
the part of the hot primary air channel (62) extending into the burner swing head (13) forms a high-speed hot primary air channel (63) and a low-speed hot primary air channel (64), the high-speed hot primary air channel (63) is close to the left side wall water cooled wall (3) or the right side wall water cooled wall (4), and the low-speed hot primary air channel (64) is far away from the left side wall water cooled wall (3) or the right side wall water cooled wall (4);
the part of the primary air-powder channel (52) extending into the burner swing head (13) forms a fresh primary air-powder channel (54) and a concentrated primary air-powder channel (55), the fresh primary air-powder channel (54) is close to the left side wall water-cooled wall (3) or the right side wall water-cooled wall (4), and the concentrated primary air-powder channel (55) is far away from the left side wall water-cooled wall (3) or the right side wall water-cooled wall (4);
and the hot primary air inlet (61) is connected with an outlet hot primary air main pipe of the air preheater, and the hot primary air entering the hearth is direct-current hot primary air and can reach the middle area of the side wall.
2. The prevention and control system for high temperature corrosion of water walls of utility boilers according to claim 1, characterized in that the number of the layer A burners (7), the layer B burners (8), the layer C burners (9), the layer D burners (10), the layer E burners (11) and the layer F burners (12) is the same, and is respectively 6 or 8.
3. A method of operating a prevention and control system for high temperature corrosion of water walls of utility boilers as claimed in claim 1 or 2, characterized by the steps of:
the method comprises the following steps: respectively arranging a group of novel direct-current combustors (5) in the B-layer combustor (8), the C-layer combustor (9), the D-layer combustor (10) and the E-layer combustor (11) close to a left side wall water-cooled wall (3) and a right side wall water-cooled wall (4), and arranging traditional cyclone combustors (6) between the novel direct-current combustors (5);
step two: by the action of the shutter baffle (53), horizontal shade separation of primary air carrying coal dust at the outlet of the primary air-powder channel (52) is realized, the powder quantity of the channel of the near side wall is high, and the powder quantity of the far side wall is low; by utilizing the function of an elbow structure, hot primary air led out from an outlet main pipe of the air preheater realizes the distribution of air quantity at an outlet of a hot primary air channel (62), the air quantity of a channel on a near side wall is high, and the air quantity of a far side wall is low;
step three: the burner swinging head (13) swings inwards along the horizontal direction of the cross section of the hearth to adjust the high-temperature corrosion prevention and control effect, and the burner swinging head (13) swings up and down along the height direction of the hearth to adjust the height of the flame center;
step four: an oxygen-rich area, a light powder area, a thick powder area and a afterburning area are sequentially formed in the direction away from the water-cooled wall of the side wall, so that the dual functions of oxygen supplementation in a high-temperature corrosion area of the water-cooled wall of the side wall and air supplementation in a severe burning area of the thick powder are realized.
CN202110476783.0A 2021-04-29 2021-04-29 Prevention and control system and method for high-temperature corrosion of water wall of power station boiler Active CN113339784B (en)

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CN112709985A (en) * 2021-01-04 2021-04-27 西安热工研究院有限公司 Side wall water-cooled wall adherence protection device based on horizontal shade separation

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CN109737387A (en) * 2018-12-07 2019-05-10 华电电力科学研究院有限公司 A kind of device and working method preventing face-fired boiler side water wall high temperature corrosion
CN112709985A (en) * 2021-01-04 2021-04-27 西安热工研究院有限公司 Side wall water-cooled wall adherence protection device based on horizontal shade separation

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