A supplementary burner system for coal-fired annular sleeve kiln

Abstract

The present invention discloses a supplementary burner system applied to a coal-fired annular sleeve kiln, comprising: a pulverized coal distribution system, an upper combustion chamber branch, a lower combustion chamber branch, a Y-type distributor and a supplementary burner; wherein, the feed port of the pulverized coal distribution system is connected to the pulverized coal bin via a rotary feeder, the pulverized coal distribution system uses a pulverized coal quantitative distribution unit to measure the fluidized pulverized coal and distribute it to the upper combustion chamber branch and the lower combustion chamber branch respectively, the upper combustion chamber branch is connected to the upper combustion chamber burner of the sleeve kiln, and a Y-type distributor is arranged on the lower combustion chamber branch, the Y-type distributor divides the lower combustion chamber branch into two branches, one of which is connected to the lower combustion chamber burner of the sleeve kiln, and the other is connected to the supplementary burner, and the supplementary burner is arranged between the two lower combustion chambers. The present invention solves the problems of heat release of fuel concentrated at the arch bridge position and high thermal intensity by adding an adjustable supplementary burner, thereby increasing the service life of the lower arch bridge and reducing the maintenance workload and production cost.

Description

Technical Field

[0001] The invention relates to the technical field of sleeve kiln burners, in particular to a supplementary burner system applied to a coal-fired annular sleeve kiln. Background Art

[0002] In recent years, many annular sleeve kilns have switched to using pulverized coal as fuel for deep processing of gas. The pulverized coal has a slow combustion speed and a long flame. In addition, the pulverized coal has a high moisture content and the pulverized coal nozzle speed is high, so most of the fuel is concentrated at the arch bridge position to burn and release heat, resulting in overheating of the refractory bricks at the arch bridge position. At the same time, since the lower combustion chamber is completely pulverized coal combustion, the calorific value is high, the air configuration is close to the theoretical equivalent ratio, the driving wind temperature is 400-600℃, the ejection internal circulation flue gas temperature is 860-900℃, and the combustion heat intensity is high, the lower arch bridge generally has a short service life, resulting in poor system operation, increased inspection and maintenance workload, and increased production costs. Summary of the invention

[0003] In order to solve the problems existing in the production of coal-fired annular sleeve kilns, the present invention proposes a supplementary burner system applied to coal-fired annular sleeve kilns, which solves the problems of heat release of fuel concentrated at the arch bridge position and high thermal intensity by adding adjustable supplementary burners, thereby increasing the service life of the lower arch bridge and reducing maintenance workload and production costs.

[0004] The main technical solutions adopted in the present invention are:

[0005] A supplementary burner system for a coal-fired annular sleeve kiln comprises: a pulverized coal distribution system, an upper combustion chamber branch, a lower combustion chamber branch, a Y-shaped distributor and a supplementary burner; wherein

[0006] The feed port of the coal powder distribution system is connected to the coal powder bin via a rotary feeder. The coal powder distribution system adopts a coal powder quantitative distribution unit to measure the fluidized coal powder and distribute it to the upper combustion chamber branch and the lower combustion chamber branch respectively. The upper combustion chamber branch is connected to the burner of the upper combustion chamber of the sleeve kiln. A Y-type distributor is provided on the lower combustion chamber branch. The Y-type distributor divides the lower combustion chamber branch into two branches, one of which is connected to the burner of the lower combustion chamber of the sleeve kiln, and the other branch is connected to the supplementary burner. A supplementary burner is provided between every two lower combustion chambers of the sleeve kiln.

[0007] Preferably, the coal powder distribution system includes a coal powder cavity, a plurality of coal powder quantitative distribution units and a fluidizing fan, wherein the fluidizing fan is installed on the bottom side of the coal powder cavity, a plurality of the coal powder quantitative distribution units are installed in the coal powder cavity, and each of the coal powder quantitative distribution units is eccentrically matched with the coal powder conveying pipelines of the upper combustion chamber branch and the lower combustion chamber branch.

[0008] Preferably, the coal powder quantitative distribution unit includes a feeding disc and a disc motor that drives the feeding disc to rotate, and the feeding disc is evenly distributed with a number of coal powder receiving holes. When the feeding disc rotates, the coal powder in the coal powder receiving holes in the annular area covered by the coal powder conveying pipeline is carried into the coal powder conveying pipeline by the conveying wind, and a connecting component is provided between the feeding disc and the coal powder conveying pipeline.

[0009] Preferably, the upper combustion chamber branch and the lower combustion chamber branch both include a coal powder conveying pipeline and a coal powder conveying fan. The air inlet at one end of the coal powder conveying pipeline is connected to the air outlet of the coal powder conveying fan. The coal powder conveying fan is a variable frequency speed regulating fan. The flow rate of each conveying air is remotely measured. Each coal powder conveying fan adopts PID adjustment of the frequency converter-flow detection to accurately give the flow rate of each conveying air.

[0010] Each combustion chamber uses an independent conveying fan, and each pulverized coal conveying fan is frequency-controlled. The flow rate of each conveying air route is remotely measured. The flow rate of each conveying air route is accurately given through the PID adjustment of the frequency converter-flow detection of each pulverized coal conveying fan.

[0011] Preferably, the supplementary burner includes a first insulating sleeve, a second insulating sleeve, a burner fixing device, a combustion-supporting air cavity tube and an adjustable pulverized coal nozzle. The adjustable pulverized coal nozzle is located in the combustion-supporting air cavity tube and passes through the combustion-supporting air cavity tube. The powder inlet of the adjustable pulverized coal nozzle is connected to the supplementary burner nozzle branch of the Y-type distributor through an adapter. The end of the combustion-supporting air cavity tube close to the powder inlet of the adjustable pulverized coal nozzle is installed in cooperation with the adjustable pulverized coal nozzle using a sealing cover plate. The combustion-supporting air interface of the combustion-supporting air cavity tube is connected to the combustion-supporting air bypass newly added to the combustion-supporting air branch of the lower combustion chamber. The first insulating sleeve is sleeved on the outer periphery of the powder outlet end of the adjustable pulverized coal nozzle, and the second insulating sleeve is sleeved on the outer periphery of the air outlet end of the combustion-supporting air cavity tube. The burner fixing device is installed on the outer periphery of the combustion-supporting air cavity tube, and is used to fix the supplementary burner on the wall of the lower combustion chamber.

[0012] Preferably, the Y-type distributor and the supplementary burner are both connected to the pulverized coal conveying pipeline by means of adjustable sleeves, and the resistance in the pulverized coal conveying pipeline is adjusted by means of adjustable sleeves of different specifications, thereby adjusting the amount of pulverized coal conveyed.

[0013] Preferably, the installation height of the supplementary burner is within the range of 0.5 m above the center line of the lower combustion chamber and 1 m below the center line of the lower combustion chamber, and the circumferential position is located at the center of two adjacent combustion chambers.

[0014] Preferably, the number of the supplementary burners is consistent with the number of lower burners installed on the original lower combustion chamber.

[0015] Beneficial effects: The present invention provides a supplementary burner system for a coal-fired annular sleeve kiln, which has the following advantages compared with the prior art:

[0016] 1. By adjusting the resistance of the original lower combustion chamber burner and the newly added pulverized coal spray gun, the pulverized coal nozzle speed is reduced to avoid most of the fuel being concentrated at the lower arch bridge position for combustion and heat release, thereby increasing the life of the arch bridge bricks;

[0017] 2. The amount of pulverized coal in the original lower combustion chamber burner is proportionally adjusted through a Y-type distributor, so that part of the pulverized coal is diverted to the supplementary burner, thereby reducing the flow of the original pulverized coal burner in the lower combustion chamber, increasing the residence time of the pulverized coal in the combustion chamber, and improving the degree of combustion of the pulverized coal in the combustion chamber, further alleviating the problem of concentrated load on the arch bridge.

[0018] 3. The invention makes the radial and circumferential load distribution of the sleeve kiln more uniform by adding additional burners, effectively reduces overburning and underburning, increases the burnout rate of pulverized coal, reduces heat consumption, and improves product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a system structure diagram of Example 1;

[0020] Figure 2 It is a structural schematic diagram of the supplementary burner of Example 1;

[0021] Figure 3 is a cross-sectional schematic diagram of the supplementary burner of Example 1;

[0022] Figure 4 This is a schematic diagram of the installation of the adjustable sleeve of Example 1;

[0023] Figure 5 This is a schematic diagram of the structure of the coal powder quantitative distribution unit in Example 1;

[0024] In the figure: coal powder distribution system 1, coal powder cavity 1-1, coal powder quantitative distribution unit 1-2, feeding disc 1-21, disc motor 1-22, connecting assembly 1-23, fluidizing fan 1-3, upper combustion chamber branch 2, coal powder conveying pipeline 2-1, coal powder conveying fan 2-2, lower combustion chamber branch 3, Y-type distributor 4, supplementary burner 5, first insulation sleeve 5-1, second insulation sleeve 5-2, burner fixing device 5-3, combustion air cavity tube 5-4, adjustable coal powder nozzle 5-5, sealing cover plate 5-6, combustion air interface 5-7, rotary feeder 6, adapter 7, adjustable sleeve 8, coal powder bin 9. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. The following description of the specific implementation is merely exemplary, and it should be understood that the specific implementation described herein is only used to explain the present invention, and is by no means a limitation of the present invention and its application or usage.

[0026] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may also be a centered element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a centered element at the same time. On the contrary, when an element is referred to as being "directly on" another element, there is no intermediate element. On the contrary, when an element is referred to as being "directly" connected to another element, there is no intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0027] In the description of the present invention, it should be understood that the terms "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0028] Example 1

[0029] like Figure 1 As shown, a supplementary burner system applied to a coal-fired annular sleeve kiln includes a pulverized coal distribution system 1, an upper combustion chamber branch 2, a lower combustion chamber branch 3, a Y-shaped distributor 4 and a supplementary burner 5.

[0030] In Example 1, the coal powder distribution system 1 is usually located in a coal powder distribution workshop near the kiln, including a coal powder cavity 1-1, a plurality of coal powder quantitative distribution units 1-2 and a fluidizing fan 1-3, wherein the feed port of the coal powder cavity 1-1 is connected to the coal powder bin 9 via a rotary feeder 6, and the fluidizing fan 1-3 is installed on the bottom side of the coal powder cavity 1-1. Under the action of the fluidizing fan 1-3, the coal powder in the coal powder cavity 1-1 is kept in a fluidized state. A plurality of coal powder quantitative distribution units 1-2 are installed in the coal powder cavity 1-1, and a plurality of coal powder quantitative distribution units 1-2 are eccentrically matched with the coal powder conveying pipelines of the upper combustion chamber branch 2 and the lower combustion chamber branch 3, respectively. The coal powder quantitative distribution unit 1-2 measures the fluidized coal powder and distributes it to the upper combustion chamber branch 2 and the lower combustion chamber branch 3, respectively. The upper combustion chamber branch 2 is connected to the burner of the upper combustion chamber of the sleeve kiln, and a Y-type distributor 6 is provided on the lower combustion chamber branch 3. The Y-type distributor 6 divides the lower combustion chamber branch 3 into two branches, one of which is connected to the burner of the lower combustion chamber of the sleeve kiln, and the other is connected to the supplementary burner 5. The supplementary burner 5 is arranged between the two lower combustion chambers. In this embodiment 1, the installation height of the supplementary burner 5 is located within the range of 0.5m upward from the center line of the lower combustion chamber and 1m downward from the center line of the lower combustion chamber, and the circumferential position is located at the center of the two adjacent combustion chambers.

[0031] In this embodiment 1, the upper combustion chamber branch 2 and the lower combustion chamber branch 3 both include a coal powder conveying pipeline 2-1 and a coal powder conveying fan 2-2, and the air inlet at one end of the coal powder conveying pipeline 2-1 is connected to the air outlet of the coal powder conveying fan 2-2. In this embodiment 1, each combustion chamber uses an independent coal powder conveying fan, and each coal powder conveying fan is variable frequency speed regulation, and the flow rate of each conveying air is remotely measured, and the PID adjustment of the frequency converter-flow detection of each coal powder conveying fan is used to accurately give the flow rate of each branch conveying air.

[0032] In this embodiment 1, Figure 5As shown, the coal powder quantitative distribution unit 1-2 includes a feeding disc 1-21 and a disc motor 1-22 that drives the feeding disc to rotate. The feeding disc 1-21 is evenly distributed with a plurality of coal powder receiving holes, and is located in the annular area covered by the coal powder conveying pipeline 2-1 when the feeding disc 1-21 rotates. A connecting assembly 1-23 is provided between the feeding disc 1-21 and the coal powder conveying pipeline 2-1. The fluidized coal powder enters the coal powder receiving hole 1-23 of the feeding disc 1-21. When the coal powder receiving hole 1-23 rotates into the ventilation area of ​​the coal powder conveying pipeline 2-1 (i.e., when it is connected to the coal powder conveying pipeline), the coal powder is blown out and delivered to the burner of the sleeve kiln through the coal powder conveying pipeline. In this embodiment, the amount of coal powder supplied to the burner can be controlled by changing the rotation speed of the feeding disc 1-21. The faster the rotation speed of the feeding disc 1-21, the greater the amount of coal powder supplied to the burner per unit time. Depending on the specifications of the sleeve kiln, the coal powder quantitative distribution units are also different. For example, a 300TPD sleeve kiln is equipped with 10 coal powder quantitative distribution units, a 500TPD sleeve kiln is equipped with 12 coal powder quantitative distribution units, a 600TPD sleeve kiln is equipped with 14 coal powder quantitative distribution units, and an 800TPD sleeve kiln is equipped with 18 coal powder quantitative distribution units. Each coal powder quantitative distribution unit 1-2 simultaneously supplies coal powder to the burners installed on the upper and lower combustion chambers through the coal powder conveying pipeline 2-1.

[0033] In this embodiment 1, Figure 2-3 As shown, the supplementary burner 5 includes a first insulation sleeve 5-1, a second insulation sleeve 5-2, a burner fixing device 5-3, a combustion air cavity tube 5-4 and an adjustable pulverized coal nozzle 5-5. The adjustable pulverized coal nozzle 5-5 is located in the combustion air cavity tube 5-4 and penetrates the combustion air cavity tube 5-4. The powder inlet of the adjustable pulverized coal nozzle 5-5 is connected to the supplementary burner branch pipe of the Y-type distributor 6 through an adapter 7. The end of the combustion air cavity tube 5-4 close to the powder inlet of the adjustable pulverized coal nozzle 5-5 adopts a sealing The cover plate 5-6 is installed in cooperation with the adjustable pulverized coal nozzle 5-5, the combustion air interface 5-7 of the combustion air cavity tube 5-4 is connected to the newly added combustion air bypass of the combustion air branch pipe of the lower combustion chamber, the first insulation sleeve 5-1 is sleeved on the outer periphery of the powder outlet end of the adjustable pulverized coal nozzle 5-5, the second insulation sleeve 5-2 is sleeved on the outer periphery of the air outlet end of the combustion air cavity tube 5-4, and the burner fixing device is installed on the outer periphery of the combustion air cavity tube 5-4, and is used to fix the supplementary burner on the wall of the lower combustion chamber.

[0034] In this embodiment 1, the Y-type distributor 4 and the supplementary burner 5 are connected to the pulverized coal conveying pipeline 2-1 by an adjustable sleeve 8. Figure 4 As shown, adjustable sleeves 8 of different specifications can be used to adjust the resistance in the coal powder conveying pipeline, thereby adjusting the amount of coal powder conveyed.

[0035] In this embodiment 1, the number of supplementary burners is consistent with the number of burners in the original lower combustion chamber. In the present invention, the number of lower combustion chambers is selectively set according to the output, and one burner is set in each lower combustion chamber.

[0036] The working principle of this embodiment 1 is as follows:

[0037] The ground coal powder is stored in the coal powder bin 9 and fed into the coal powder cavity 1-1 of the coal powder distribution system through the rotary feeder 6. In the coal powder cavity 1-1, a fluidizing fan 1-3 and a coal powder quantitative distribution unit matching the number of sleeve kiln burners are arranged. The fluidizing fan 1-3 is used to introduce fluidizing air into the lower part of the coal powder cavity 1-1. The coal powder forms fluidized coal powder under the action of the fluidizing air. Then, the coal powder is metered and distributed through the coal powder quantitative distribution unit 1-2. The upper combustion chamber remains unchanged. A Y-type distributor 6 is added to the existing lower combustion chamber branch. The lower combustion chamber branch is divided into two branches, one of which is connected to the burner of the lower combustion chamber of the sleeve kiln, and the other is connected to the supplementary burner 5. At the same time, a bypass is added to the existing lower combustion chamber combustion air branch pipe, and the bypass leads to the combustion air interface of the supplementary combustion air cavity pipe. The present invention diverts a portion of the pulverized coal amount of the original lower combustion chamber burner to the supplementary burner nozzle through the Y-type distributor 4, thereby reducing the flow of the pulverized coal burner in the original lower combustion chamber, increasing the residence time of the pulverized coal in the combustion chamber, improving the degree of burnout of the pulverized coal in the combustion chamber, and further alleviating the problem of concentrated load on the arch bridge.

[0038] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0039] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A supplementary burner system for a coal-fired annular sleeve kiln, characterized in that: include: Pulverized coal distribution system, upper combustion chamber branch, lower combustion chamber branch, Y-type distributor and supplementary burner; among them, The feed port of the pulverized coal distribution system is connected to the pulverized coal bin via a rotary feeder. The pulverized coal distribution system uses a pulverized coal quantitative distribution unit to measure the fluidized pulverized coal and distribute it to the upper combustion chamber branch and the lower combustion chamber branch respectively. The upper combustion chamber branch is connected to the burner of the upper combustion chamber of the sleeve kiln. A Y-type distributor is provided on the lower combustion chamber branch. The Y-type distributor divides the lower combustion chamber branch into two branches, one of which is connected to the burner of the lower combustion chamber of the sleeve kiln, and the other is connected to the supplementary burner. A supplementary burner is provided between every two lower combustion chambers of the sleeve kiln. The installation height of the supplementary burner is within the range of 0.5m upward and 1m downward from the center line of the lower combustion chamber, and the circumferential position is located at the center of two adjacent combustion chambers; The supplementary burner includes a first insulating sleeve, a second insulating sleeve, a burner fixing device, a combustion-supporting air cavity tube and an adjustable pulverized coal nozzle. The adjustable pulverized coal nozzle is located in the combustion-supporting air cavity tube and passes through the combustion-supporting air cavity tube. The powder inlet of the adjustable pulverized coal nozzle is connected to the supplementary burner nozzle branch of the Y-type distributor through an adapter. The end of the combustion-supporting air cavity tube close to the powder inlet of the adjustable pulverized coal nozzle is installed in cooperation with the adjustable pulverized coal nozzle using a sealing cover plate. The combustion-supporting air interface of the combustion-supporting air cavity tube is connected to the combustion-supporting air bypass newly added to the combustion-supporting air branch of the lower combustion chamber. The first insulating sleeve is sleeved and arranged on the outer periphery of the powder outlet end of the adjustable pulverized coal nozzle, and the second insulating sleeve is sleeved and arranged on the outer periphery of the air outlet end of the combustion-supporting air cavity tube. The burner fixing device is installed on the outer periphery of the combustion-supporting air cavity tube, and is used to fix the supplementary burner on the wall of the lower combustion chamber.

2. The supplementary burner system for coal-fired annular sleeve kiln according to claim 1, characterized in that: The coal powder distribution system includes a coal powder cavity, a plurality of coal powder quantitative distribution units and a fluidizing fan, wherein the fluidizing fan is installed on the bottom side of the coal powder cavity, a plurality of the coal powder quantitative distribution units are installed in the coal powder cavity, and each of the coal powder quantitative distribution units is eccentrically matched with the coal powder conveying pipelines of the upper combustion chamber branch and the lower combustion chamber branch.

3. The supplementary burner system for coal-fired annular sleeve kiln according to claim 2 is characterized in that: The coal powder quantitative distribution unit includes a feeding disc and a disc motor that drives the feeding disc to rotate. The feeding disc is evenly distributed with a plurality of coal powder receiving holes. When the feeding disc rotates, the coal powder in the coal powder receiving holes in the annular area covered by the coal powder conveying pipeline is carried into the coal powder conveying pipeline by the conveying wind. A connecting component is provided between the feeding disc and the coal powder conveying pipeline.

4. The supplementary burner system for coal-fired annular sleeve kiln according to claim 2, characterized in that: The upper combustion chamber branch and the lower combustion chamber branch both include a coal powder conveying pipeline and a coal powder conveying fan. The air inlet at one end of the coal powder conveying pipeline is connected to the air outlet of the coal powder conveying fan. The coal powder conveying fan is a variable frequency speed regulating fan. The flow rate of each conveying air is remotely measured. Each coal powder conveying fan adopts PID regulation of frequency converter-flow detection to accurately set the flow rate of each conveying air. Each combustion chamber uses an independent conveying fan, and each pulverized coal conveying fan is frequency-controlled. The flow rate of each conveying air route is remotely measured. The flow rate of each conveying air route is accurately given through the PID adjustment of the frequency converter-flow detection of each pulverized coal conveying fan.

5. The supplementary burner system for coal-fired annular sleeve kiln according to claim 2, characterized in that: The Y-type distributor and the supplementary burner are both connected to the pulverized coal conveying pipeline by an adjustable sleeve. Adjustable sleeves of different specifications are used to adjust the resistance in the pulverized coal conveying pipeline, thereby adjusting the amount of pulverized coal conveyed.

6. The supplementary burner system for coal-fired annular sleeve kiln according to claim 2, characterized in that: The number of the supplementary burners is consistent with the number of lower burners installed on the original lower combustion chamber.

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