Device and method for improving flame fullness of hearth of angle combustion boiler

Abstract

The invention provides a device and method for improving the flame fullness degree of a hearth of an angle type combustion boiler, the device comprises the angle type combustion boiler and a plurality of fan coal mills corresponding to the angle type combustion boiler, each fan coal mill is provided with a plurality of outlet pipelines, each outlet pipeline of the same fan coal mill is connected with a burner, and the burner is connected with the angle type combustion boiler. The combustor is connected with a hearth of the angle type combustion boiler, the outlet pipelines guide pulverized coal into the combustor, the combustor ignites the pulverized coal and sprays the pulverized coal into the hearth for combustion, and the outlet pipelines of the fan coal mills are arranged in a layered mode in the direction perpendicular to the ground. The outlet pipelines in the same layer have the same height from the ground, and the flow direction of pulverized coal in the outlet pipelines is parallel to the ground; the fan coal mills corresponding to the multiple outlet pipelines in the same layer are symmetrically distributed relative to the hearth, and the fan coal mills corresponding to the multiple outlet pipelines in different layers are adjacently distributed relative to the hearth.

Description

Technical Field

[0001] The invention relates to the field of combustion optimization and ventilation regulation of combustion boilers, and in particular to a device and method for improving the flame fullness of a furnace of an angle-type combustion boiler. Background Art

[0002] Corner-fired boilers are widely used in thermal power generation systems in the power, metallurgy and other industries. They arrange burners at the four corners or six corners of the furnace to evenly distribute the coal powder output by the pulverizer in the furnace for combustion, so as to generate high-temperature flue gas for steam boilers. In order to ensure the efficiency and stability of the combustion process, it is necessary to achieve uniform filling of the furnace flame, so as to effectively control the furnace temperature distribution, reduce incomplete combustion and pollutant emissions. However, in actual operation, with the continuous decline in boiler load, the number of coal mills put into operation has also decreased accordingly. For boilers equipped with fan pulverizers for corner combustion, under the three-mill operation mode, the flame in the furnace will appear to be concentrated on one side of the furnace. Compared with four-corner tangential combustion boilers and counter-compression combustion boilers, the filling degree of the flame in the furnace is seriously unbalanced, resulting in a more serious biased burning phenomenon, which has a very adverse effect on the safe and stable operation of the boiler water-cooled wall and the rear heating surface.

[0003] In the traditional angle-fired boiler system, the distribution of the pulverized coal pipeline between the fan mill and the burner is relatively complex, and burners at different elevations require different pulverized coal flow rates and ventilation volumes to meet the load requirements. In order to achieve reasonable pulverized coal transportation, each outlet pipeline must ensure uniform pulverized coal distribution while maintaining consistent resistance. However, existing technologies generally lack the optimization and adjustment of parameters such as fan mill output, pressure head coefficient, and flow coefficient, resulting in the inability to effectively adjust the distribution of pulverized coal and ventilation volume when the load changes, affecting the economy and reliability of boiler operation. In addition, as the boiler load increases or decreases, the output of the fan mill needs to be flexibly adjusted to avoid excessive or low pulverized coal concentrations from having an adverse effect on combustion.

[0004] Therefore, how to optimize the fan coal mill output, ventilation volume and coal powder distribution under the premise of meeting the boiler load demand, so as to achieve the same resistance of each outlet pipeline and ensure the uniform fullness of the furnace flame has become a technical problem to be solved. The present invention is aimed at the above problems and proposes a device and method for improving the furnace flame fullness of an angle-type combustion boiler. Summary of the invention

[0005] In a first aspect of the present disclosure, a device for improving the flame fullness of a furnace of an angle-type combustion boiler is provided, the device comprising an angle-type combustion boiler and a plurality of corresponding fan coal mills, each fan coal mill being provided with a plurality of outlet pipes, each outlet pipe of the same fan coal mill being connected to a burner, the burner being connected to the furnace of the angle-type combustion boiler, the outlet pipe introducing pulverized coal into the burner, the burner igniting the pulverized coal and spraying it into the furnace for combustion, wherein:

[0006] The outlet pipes of the plurality of fan coal mills are arranged in layers in a direction perpendicular to the ground, and the plurality of outlet pipes of a single fan coal mill are arranged in the same layer. The plurality of outlet pipes in the same layer are at the same height from the ground, and the coal powder flows in the pipes in parallel with the ground.

[0007] The fan coal mills corresponding to the multiple outlet pipes in the same layer are symmetrically distributed relative to the furnace, and the fan coal mills corresponding to the multiple outlet pipes in different layers are adjacently distributed relative to the furnace.

[0008] A second aspect of the present disclosure provides a method for improving the flame fullness of a corner combustion boiler furnace, comprising:

[0009] Calculating the resistance increase value of each outlet pipe of each fan coal mill, and calculating the output of the corresponding fan coal mill and its reduction value according to the resistance increase value;

[0010] Calculating whether the total output of all the fan coal mills meets the electric load demand according to the output of all the fan coal mills and their reduction values;

[0011] In the case where the electric load demand is not met, the capacity increase and transformation parameters of the fan coal mill are calculated from high to low according to the resistance increase value in a direction perpendicular to the ground, and the number of coal mills to be increased and transformed is calculated according to the output of the corresponding fan coal mill and its reduction value;

[0013] Calculate the head coefficient and flow coefficient of the fan coal mill after transformation to adjust the ventilation volume;

[0014] The pulverized coal distribution is adjusted based on the adjusted ventilation volume to keep the resistance of each outlet pipe consistent.

[0015] Furthermore, the resistance increase value ΔP of the fan coal mill outlet pipeline is calculated using the following formula:

[0016] ΔP=ΣΔP f +ΣΔP ξ +P 0 ,

[0017] Among them, ΣΔP is the friction resistance of the pipeline when the powder-containing gas flows, ΣΔP ξis the local resistance of the pipeline components in the pipeline, P 0 It is the sum of the resistance of equipment and components, the pressure head loss of coal powder lifting, the acceleration loss of coal powder, the absolute value of the furnace negative pressure, the gas inlet resistance and the negative pressure at the gas inlet.

[0018] Furthermore, the pipeline friction resistance ΣΔP when the powder-containing gas flows is calculated using the following formula:

[0019]

[0020] Among them, λ μ is the friction coefficient of powder-containing gas flow, L is the calculated length of pipeline friction resistance, D e is the equivalent diameter of the pipe, ρ 0 is the resistance of equipment and components, ω is the flow rate of medium in the milling system pipe.

[0021] Furthermore, the local resistance ΣΔP of the pipeline element in the pipeline ξ Use the following formula to calculate:

[0022]

[0023] Among them, ξ 0 is the local resistance coefficient of the piping element.

[0024] Further, the calculating whether the sum of the outputs of all the fan coal mills meets the electric load demand according to the outputs of all the fan coal mills and the reduction values ​​thereof includes:

[0025] Accumulating the output reduction value ΔM of each of the fan coal mills to obtain the overall output reduction value of all the fan coal mills;

[0026] The current total output of the fan coal mill is compared with a preset electric load demand value to determine whether the total output meets the electric load demand.

[0027] Furthermore, the method further includes adjusting the fan coal mill output according to the electric load demand when the electric load demand is not met, specifically including:

[0028] When the total output is lower than the electric load demand, the electric load difference is calculated. If the electric load difference exceeds the preset adjustment threshold, the output of the fan pulverizer is adjusted sequentially from high to low along a direction perpendicular to the ground until the electric load demand is met.

[0029] Furthermore, the fan coal mill pressure head coefficient and flow coefficient are calculated by the following formula:

[0030]

[0031] Among them, f H is the fan coal mill pressure head coefficient, P is the total resistance of the pulverizing system, H 0 is the basic pure air lifting pressure head, K t is the temperature correction factor, K μ K is the correction factor of the lifting head under powder content, 3 K is the correction factor of the lifting pressure head caused by wear in the later period of the fan coal mill, P is the correction factor of atmospheric pressure to pressure head,

[0032]

[0033] Among them, f Q is the fan pulverizer flow coefficient, Q V is the assumed ventilation rate, Q 0 is the basic flow.

[0034] Furthermore, the pulverized coal distribution is adjusted based on the adjusted ventilation volume to keep the resistance of each outlet pipe consistent, including providing a tongue-shaped baffle adjustment device on the pipe with lower resistance, and the pulverized coal is evenly distributed by adjusting the opening.

[0035] Furthermore, the method further comprises: when the number of outlet pipes of the operating fan coal mills does not exceed the single-layer capacity, arranging the outlet pipes of all the operating fan coal mills on the same layer to form a same-layer combustion flame;

[0036] When the number of outlet pipes of the fan mills in operation is greater than the capacity of a single layer but less than the total capacity of all layers, one outlet pipe of the fan mill is arranged on each layer first, and the outlet pipes of the remaining fan mills are arranged from low layers to high layers in a direction perpendicular to the ground.

[0037] Beneficial effects: The disclosed device and method for improving the flame fullness of the corner-type combustion boiler furnace solves the problems of uneven resistance of the coal powder pipeline and uneven distribution of coal powder in the corner-type combustion boiler by optimizing the output of the fan coal mill, adjusting the ventilation volume, and accurately distributing the coal powder. By calculating the resistance increase value of each outlet pipeline and making corresponding adjustments, the resistance of each pipeline is ensured to be consistent, thereby achieving uniform distribution of coal powder. At the same time, by optimizing the output of the fan coal mill and adjusting the coal powder distribution device in real time, the system parameters can be flexibly adjusted according to the power load demand, thereby improving the flame fullness and combustion efficiency of the furnace, reducing incomplete combustion and pollutant emissions, and improving the economy and stability of boiler operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the lower structure of a device for improving the flame fullness of a corner combustion boiler furnace according to an embodiment of the present disclosure;

[0039] Figure 2 It is a schematic diagram of the middle structure of a device for improving the flame fullness of a corner combustion boiler furnace according to an embodiment of the present disclosure;

[0040] Figure 3 It is a schematic diagram of the upper structure of a device for improving the flame fullness of a corner combustion boiler furnace according to an embodiment of the present disclosure;

[0041] Figure 4 The present invention discloses a flow chart of a method for improving the flame fullness of a corner combustion boiler furnace. DETAILED DESCRIPTION

[0042] Here, exemplary embodiments are described in detail, and examples thereof are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the embodiments of the present disclosure.

[0043] The terms used in the disclosed embodiments are only for the purpose of describing specific embodiments and are not intended to limit the disclosed embodiments. The singular forms of "a", "said" and "the" used in the disclosed embodiments and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0044] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0045] The present invention provides a device for improving the flame fullness of a furnace of an angle-type combustion boiler, the device comprising an angle-type combustion boiler and a plurality of corresponding fan coal mills, each fan coal mill being provided with a plurality of outlet pipes, each outlet pipe of the same fan coal mill being connected to a burner, the burner being connected to the furnace of the angle-type combustion boiler, the outlet pipe introducing pulverized coal into the burner, the burner igniting the pulverized coal and spraying the pulverized coal into the furnace for combustion, wherein:

[0046] The multiple outlet pipes of the multiple fan coal mills are arranged in layers in a direction perpendicular to the ground, the multiple outlet pipes in the same layer are at the same height from the ground, and the coal powder flows in the pipes parallel to the ground;

[0047] The fan coal mills corresponding to the multiple outlet pipes in the same layer are symmetrically distributed relative to the furnace, and the fan coal mills corresponding to the multiple outlet pipes in different layers are adjacently distributed relative to the furnace.

[0048] For example, Figures 1 to 3 , is a schematic diagram of a device structure for improving the flame fullness of a corner-type combustion boiler furnace according to an embodiment of the present disclosure, wherein each fan coal mill is provided with three outlet pipes, each outlet pipe of the same fan coal mill is connected to a burner, the burner is connected to the furnace of the corner-type combustion boiler, the outlet pipe guides the coal powder into the burner, the burner ignites the coal powder and sprays it into the furnace for combustion, wherein:

[0049] Three layers of outlet pipes are arranged in layers perpendicular to the ground, with 6 pipes arranged on each layer. The 6 outlet pipes on the same layer are at the same height from the ground, and the coal powder flows in them in a direction parallel to the ground.

[0050] The two fan coal mills corresponding to the six outlet pipes in the same layer are symmetrically distributed relative to the furnace.

[0051] The fan coal mills corresponding to the multiple outlet pipes in different layers are distributed adjacent to the furnace.

[0052] Specifically, refer to Figure 1 The fan pulverizer 101 and the fan pulverizer 102 are symmetrically distributed relative to the furnace 110. The fan pulverizer 101 and the fan pulverizer 102 have three outlet pipes respectively. Each outlet pipe is connected to a burner (not marked in the figure). The burner is connected to the furnace 110 of the angle-fired boiler. The outlet pipe guides the coal powder into the burner, and the burner ignites the coal powder and sprays it into the furnace for combustion.

[0053] refer to Figure 2 The fan pulverizer 103 and the fan pulverizer 104 are symmetrically distributed relative to the furnace 110. The fan pulverizer 103 and the fan pulverizer 104 have three outlet pipes respectively. Each outlet pipe is connected to a burner (not marked in the figure). The burner is connected to the furnace 110 of the angle-fired boiler. The outlet pipe guides the coal powder into the burner, and the burner ignites the coal powder and sprays it into the furnace for combustion.

[0054] refer to Figure 3The fan pulverizer 105 and the fan pulverizer 106 are symmetrically distributed relative to the furnace 110. The fan pulverizer 105 and the fan pulverizer 106 have three outlet pipes respectively. Each outlet pipe is connected to a burner (not marked in the figure). The burner is connected to the furnace 110 of the angle-fired boiler. The outlet pipe guides the coal powder into the burner, and the burner ignites the coal powder and sprays it into the furnace for combustion.

[0055] Among them, the outlet pipes of fan mill 101 and fan mill 102 are located in the lower layer along the direction perpendicular to the ground, the outlet pipes of fan mill 103 and fan mill 104 are located in the middle layer along the direction perpendicular to the ground, and the outlet pipes of fan mill 105 and fan mill 106 are located in the upper layer along the direction perpendicular to the ground. Fan mill 101 is adjacent to fan mill 103 and fan mill 105, and fan mill 102 is adjacent to fan mill 104 and fan mill 106.

[0056] It should be noted that the number of fan pulverizers corresponding to the angle-type combustion boiler can be set according to actual conditions, the number of outlet pipes leading from the fan pulverizer can also be set according to actual conditions, and the number of layers and flow directions of the outlet pipes can be set according to actual conditions. The present disclosure is only described with reference to the above embodiments and is not limited thereto.

[0057] Beneficial effects: By symmetrically distributing multiple fan pulverizers and their outlet pipes around the boiler furnace, the pulverized coal is evenly transported to the burner for ignition, thereby effectively improving the combustion efficiency; the layered arrangement of the outlet pipes further optimizes the coal supply method of the burner, making the supply of pulverized coal more uniform and reducing the possibility of incomplete combustion. In addition, the flexible adjustment of the number of fan pulverizers and the layout of the outlet pipes makes the system more adaptable and can be configured according to actual needs, enhancing the versatility and applicability of the overall device.

[0058] refer to Figure 4 , is a flow chart of a method for improving the flame fullness of a corner combustion boiler furnace according to an embodiment of the present disclosure, comprising:

[0059] S401: calculating the resistance increase value of each outlet pipe of each fan coal mill, and calculating the output of the corresponding fan coal mill and its reduction value according to the resistance increase value;

[0060] S402: Calculating whether the total output of all the fan coal mills meets the electric load demand according to the output of all the fan coal mills and their reduction values;

[0061] S403: when the electric load demand is not met, the capacity increase and transformation parameters of the fan coal mill are calculated from high to low according to the resistance increase value in a direction perpendicular to the ground, and the number of coal mills to be increased and transformed is calculated according to the output of the corresponding fan coal mill and its reduction value;

[0062] S404: Calculate the head coefficient and flow coefficient of the modified fan coal mill to adjust the ventilation volume;

[0063] S405: Adjust the pulverized coal distribution based on the adjusted ventilation volume so that the pulverized coal volume of each outlet pipe maintains a consistent resistance.

[0064] Furthermore, the resistance increase value ΔP of the fan coal mill outlet pipeline is calculated using the following formula:

[0065] ΔP=ΣΔP f +ΣΔP ξ ,

[0066] Among them, ΣΔP is the friction resistance of the pipeline when the powder-containing gas flows, ΣΔP ξ It is the local resistance of the piping components in the pipeline.

[0067] The pipeline friction resistance ΣΔP when the powder-containing gas flows is calculated using the following formula:

[0068]

[0069] Among them, λ μ is the friction coefficient of powder-containing gas flow, L is the calculated length of pipeline friction resistance, D e is the equivalent diameter of the pipe, ρ 0 is the resistance of equipment and components, ω is the flow rate of medium in the milling system pipe.

[0070] The local resistance ΣΔP of the pipeline components in the pipeline ξ Use the following formula to calculate:

[0071]

[0072] Among them, ξ 0 is the local resistance coefficient of the piping element.

[0073] Further, the calculating whether the sum of the outputs of all the fan coal mills meets the electric load demand according to the outputs of all the fan coal mills and the reduction values ​​thereof includes:

[0074] Accumulating the output reduction value ΔM of each of the fan coal mills to obtain the overall output reduction value of all the fan coal mills;

[0075] The current total output of the fan coal mill is compared with a preset electric load demand value to determine whether the total output meets the electric load demand.

[0076] Specifically, the total output reduction is calculated by summing up the output reduction values ​​of all fan coal mills to obtain the overall output reduction value. The output reduction value of each coal mill reflects the output lost due to failure, reduced efficiency or other factors.

[0077] The sum of the current actual outputs of all fan mills is calculated. This output sum takes into account the actual status of each device and is the overall system output under the current circumstances.

[0078] The calculated overall system output is compared with the system's electrical load demand value to determine whether the current output is sufficient to meet the power demand.

[0079] If the overall system output ≥ the power load demand, it means that the fan mill system can meet the current power demand; otherwise, it indicates that there is insufficient output, and measures such as adjustment or increase of standby output may be needed.

[0080] Beneficial effects: It helps to realize real-time monitoring and adjustment of the output status of the fan mill system. If insufficient output occurs, the cause can be quickly identified (such as reduced output of a single device) and compensatory measures can be taken. In this way, the system can ensure stable power supply and avoid the risk of power supply interruption or reduced efficiency caused by insufficient output. In addition, this method can help power plants allocate resources more efficiently in daily operations, extend equipment life, and reduce energy waste.

[0081] Furthermore, the method further includes adjusting the fan coal mill output according to the electric load demand when the electric load demand is not met, specifically including:

[0082] When the total output is lower than the electric load demand, the electric load difference is calculated. If the electric load difference exceeds the preset adjustment threshold, the output of the fan pulverizer is adjusted sequentially from high to low along a direction perpendicular to the ground until the electric load demand is met.

[0083] When the total output is lower than the electric load demand, the electric load difference ΔPe is further evaluated, and it is determined whether the output of the fan coal mill needs to be adjusted according to the electric load difference;

[0084] If the electric load difference ΔPe exceeds the preset adjustment threshold, the output of the coal mills at different elevations will be adjusted in sequence according to priority to ensure the uniformity of the furnace flame fullness and the satisfaction of the electric load demand;

[0085] Beneficial effect: When the load is insufficient, the system first calculates the size of the gap, and only starts to adjust when the load is obviously insufficient, avoiding energy waste and equipment fatigue caused by frequent fine-tuning. At the same time, priority adjustment based on the elevation layer ensures combustion stability, and does not cause uneven flame distribution in the furnace due to a simple increase in output, thereby reducing the safety hazards caused by unstable combustion.

[0086] Furthermore, the fan coal mill pressure head coefficient and flow coefficient are calculated by the following formula:

[0087]

[0088] Among them, f H is the fan coal mill pressure head coefficient, P is the total resistance of the pulverizing system, H 0 is the basic pure air lifting pressure head, K t is the temperature correction factor, K μ K is the correction factor of the lifting head under powder content, 3 K is the correction factor of the lifting pressure head caused by wear in the later period of the fan coal mill, P is the correction factor of atmospheric pressure to pressure head,

[0089]

[0090] Among them, f Q is the fan pulverizer flow coefficient, Q V is the assumed ventilation rate, Q 0 is the basic flow.

[0091] Furthermore, adjusting the pulverized coal distribution based on the adjusted ventilation volume so that each outlet pipe maintains a consistent resistance includes providing a tongue-shaped baffle adjustment device on the pipe with lower resistance, and ensuring uniform distribution of the pulverized coal by adjusting the opening.

[0092] Specifically, the tongue-type baffle adjustment device:

[0093] The tongue-type baffle adjustment device is a device installed in the coal powder conveying pipeline, usually located on the pipeline with lower resistance. This device can increase the flow resistance of the airflow and coal powder mixture by adjusting the opening of the baffle, making the resistance between different pipelines more balanced.

[0094] When it is detected that the resistance of a certain pipeline is low and the coal powder flow rate is higher than that of other pipelines, the resistance of the pipeline is increased by reducing the opening of the tongue-shaped baffle. In this way, the air flow rate will be reduced, thereby reducing the amount of coal powder passing through and making the coal powder distribution tend to be uniform.

[0095] Adjustment of pulverized coal distribution based on adjusted ventilation volume:

[0096] After the fan coal mill adjusts the ventilation volume, the conveying speed of coal powder and airflow will change, affecting the coal powder flow rate of each outlet pipeline.

[0097] By adjusting the opening of the tongue-shaped baffle, the coal powder delivery volume of each pipeline can be refined to adapt it to the adjusted ventilation volume, thereby ensuring that the coal powder volume in each pipeline can still be evenly distributed when the ventilation volume changes.

[0098] Achieve the effect of uniform distribution of coal powder:

[0099] The use of this tongue-shaped baffle adjustment device helps the system automatically adapt to changes in ventilation volume, reducing the need for human intervention and improving operating efficiency.

[0100] When the resistance of each pipe is consistent, the distribution of pulverized coal will also tend to be uniform. This uniform distribution is essential to maintain combustion stability and avoid the problem of excessive or low pulverized coal concentration in local areas of the furnace.

[0101] Beneficial effects: The regulating device has significant advantages in practice. Since the operating state of the fan coal mill may change due to factors such as working conditions and environment, it is difficult to maintain the consistency of pipeline resistance for a long time. Through the tongue-shaped baffle regulating device, the system can dynamically adjust the resistance of each pipeline to make the coal powder distribution stable and uniform.

[0102] This method not only reduces the difficulty of equipment maintenance, but also improves the safety of boiler operation and combustion efficiency. The tongue-shaped baffle has a relatively simple structure, is easy to adjust, and has high durability, making it suitable for long-term use in high-temperature and high-dust environments.

[0103] Furthermore, the method further comprises:

[0104] When the number of outlet pipes of the fan coal mills in operation does not exceed the single-layer capacity, the outlet pipes of all the fan coal mills in operation are arranged on the same layer to form a same-layer combustion flame;

[0105] When the number of outlet pipes of the fan mills in operation is greater than the capacity of a single layer but less than the total capacity of all layers, one outlet pipe of the fan mill is arranged on each layer first, and the outlet pipes of the remaining fan mills are arranged from low layers to high layers in a direction perpendicular to the ground.

[0106] Specifically, the fan pulverizer transports pulverized coal to the boiler burner through the outlet pipe. The layout of each outlet pipe directly affects the distribution of flames in the furnace and the combustion efficiency. If the layout is improper, it may lead to uneven flame distribution, low combustion efficiency, and even local overheating or insufficient combustion.

[0107] If the number of fan pulverizers put into operation is less than or equal to the single-layer capacity, all outlet pipes are arranged on the same layer (elevation plane) to form a same-layer combustion flame; the advantage of the same-layer arrangement is to ensure uniform flame in the furnace and avoid flame deviation or local concentration due to vertical distribution.

[0108] If the number of fan pulverizers put into operation is greater than the capacity of a single layer but does not exceed the total capacity of all layers, a layer-by-layer layout strategy is adopted, with one pipeline being arranged on each layer first. This ensures that each elevation has flame distribution and improves the combustion fullness. The rest are arranged from low to high in the vertical direction, with priority given to the lower layers, which are close to the combustion core area and can transfer heat more efficiently and support stable operation of the boiler.

[0109] In the embodiments provided in the present disclosure, it should be understood that the disclosed devices / electronic devices and methods can be implemented in other ways. For example, the device / electronic device embodiments described above are merely schematic. For example, the division of modules or units is only a logical function division. There may be other division methods in actual implementation. Multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, indirect coupling or communication connection of devices or units, which may be electrical, mechanical or other forms.

[0110] The above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present disclosure, and should all be included in the protection scope of the present disclosure.

Claims

1. A device for improving the flame fullness of a corner-fired boiler furnace, characterized in that: The device comprises an angle combustion boiler and a plurality of corresponding fan coal mills, each fan coal mill is provided with a plurality of outlet pipes, each outlet pipe of the same fan coal mill is connected to a burner nozzle, wherein: The outlet pipes of the plurality of fan coal mills are arranged in layers in a direction perpendicular to the ground, and the plurality of outlet pipes of a single fan coal mill are arranged in the same layer. The plurality of outlet pipes in the same layer are at the same height from the ground, and the coal powder flows in the pipes in parallel with the ground. The fan coal mills corresponding to the multiple outlet pipes in the same layer are symmetrically distributed relative to the furnace, and the fan coal mills corresponding to the multiple outlet pipes in different layers are adjacently distributed relative to the furnace.

2. A method for improving the flame fullness of a corner-fired boiler furnace, characterized in that: include: Calculating the resistance increase value of each outlet pipe of each fan coal mill, and calculating the output of the corresponding fan coal mill and its reduction value according to the resistance increase value; Calculating whether the total output of all the fan coal mills meets the electric load demand according to the output of all the fan coal mills and their reduction values; In the case where the electric load demand is not met, the capacity increase and transformation parameters of the fan coal mill are calculated from high to low according to the resistance increase value in a direction perpendicular to the ground, and the number of fan coal mills to be increased and transformed is calculated according to the output of the corresponding fan coal mill and its reduction value; Calculating the head coefficient and flow coefficient of the fan coal mill after transformation to adjust the ventilation volume; The duct resistance of each outlet duct is kept constant based on the adjusted ventilation volume.

3. The method according to claim 2, characterized in that The resistance increase ΔP of the fan coal mill outlet pipeline is calculated using the following formula: ΔP=ΣΔP f +ΣΔP ξ +P0, Among them, ΣΔP is the friction resistance of the pipeline when the powder-containing gas flows, ΣΔP ξ is the local resistance of the pipeline elements in the pipeline, P0 is the sum of the resistance of equipment and components, the pressure head loss of coal powder lifting, the acceleration loss of coal powder, the absolute value of the furnace negative pressure, the gas inlet resistance and the negative pressure at the gas inlet.

4. The method according to claim 3, characterized in that The pipeline friction resistance ΣΔP when the powder-containing gas flows is calculated using the following formula: Among them, λ μ is the friction coefficient of powder-containing gas flow, L is the calculated length of pipeline friction resistance, D e is the equivalent diameter of the pipeline, ρ0 is the resistance of the equipment and components, and ω is the flow rate of the medium in the milling system pipe.

5. The method according to claim 4, characterized in that The local resistance ΣΔP of the pipeline components in the pipeline ξ Use the following formula to calculate: Where ξ0 is the local resistance coefficient of the pipeline element.

6. The method according to claim 2, characterized in that The calculating, based on the outputs of all the fan coal mills and their reduction values, whether the sum of the outputs of all the fan coal mills meets the electric load demand comprises: Accumulating the output reduction value ΔM of each of the fan coal mills to obtain the overall output reduction value of all the fan coal mills; The current total output of the fan coal mill is compared with a preset electric load demand value to determine whether the total output meets the electric load demand.

7. The method according to claim 2, characterized in that The method further includes adjusting the fan coal mill output according to the electric load demand when the electric load demand is not met, specifically including: When the total output is lower than the electric load demand, the electric load difference is calculated. If the electric load difference exceeds the preset adjustment threshold, the output of the fan pulverizer is adjusted sequentially from high to low along a direction perpendicular to the ground until the electric load demand is met.

8. The method according to claim 2, characterized in that: The fan coal mill pressure head coefficient and flow coefficient are calculated by the following formula: Among them, f H is the fan coal mill pressure head coefficient, P is the total resistance of the pulverizing system, H0 is the basic pure air lifting pressure head, K t is the temperature correction factor, K μ is the correction factor for the lifting pressure head under powder content, K3 is the correction factor for the lifting pressure head caused by wear in the later period of the fan coal mill, K P is the correction factor of atmospheric pressure to pressure head, Among them, f Q is the fan pulverizer flow coefficient, Q V is the assumed ventilation volume, Q0 is the basic flow rate.

9. The method according to claim 2, characterized in that: The pulverized coal distribution is adjusted based on the adjusted ventilation volume to keep the resistance of each outlet pipe consistent, including providing a tongue-shaped baffle adjustment device on the pipe with lower resistance, and the pulverized coal is evenly distributed by adjusting the opening.

10. The method according to claim 2, characterized in that The method further comprises: When the number of outlet pipes of the fan coal mills in operation does not exceed the single-layer capacity, the outlet pipes of all the fan coal mills in operation are arranged on the same layer to form a same-layer combustion flame; When the number of outlet pipes of the fan mills in operation is greater than the capacity of a single layer but less than the total capacity of all layers, one outlet pipe of the fan mill is arranged on each layer first, and the outlet pipes of the remaining fan mills are arranged from low layers to high layers in a direction perpendicular to the ground.

Images