TWI520780B - System for controlling coal flow in a coal pulverizer - Google Patents

Description

System for controlling coal flow in a coal mill

The present invention relates to a technical field of coal flow in the exit portion of a coal mill, and more particularly to a novel and useful system/device for controlling the position of one or more coal flow vanes in the upper portion of the coal mill, Method and drive device. The system and/or apparatus in accordance with the present invention utilizes a "cylinder" that can be inserted into a turret at the top of the coal mill. The present invention allows one or more coal flow blades to be controlled by an internal control system/means. In a particular embodiment, the "cylinder" according to the present invention surrounds the original coal inlet tube and can be inserted into a turret at the top of a coal mill. The present invention again allows control by an internal control system/means One or more coal flow blades.

Semi-stationary devices (such as blades) are used in coal mills for a long time to steer and distribute the ground coal/air stream. However, to date, any system and/or method that can control such a semi-stationary device is defined by the surface of the device itself that is closest to the outer surface of the coal mill. While such systems are suitable for most situations, it is often limited or impossible to enter the mill from the outer radial circumference for low or no turret conditions.

For the above reasons, the present technology requires a control system or means that allows various coal flow devices (e.g., blades) to be controlled via an inner surface, for example, disposed about the original coal inlet pipe.

The present invention relates to a technical field of coal flow in the exit portion of a coal mill, and more particularly to a novel and useful system/device for controlling the position of one or more coal flow vanes in the upper portion of the coal mill, Method and drive device. The system and/or apparatus in accordance with the present invention utilizes a "cylinder" that can be inserted into a turret at the top of the coal mill. The present invention allows one or more coal flow blades to be controlled by an internal control system/means. In a particular embodiment, the "cylinder" according to the present invention surrounds the original coal inlet tube and can be inserted into a turret at the top of a coal mill. The present invention again allows control by an internal control system/means One or more coal flow blades.

Accordingly, one aspect of the present invention provides a system for controlling one or more coal flow blades by an internal control system, the internal control system comprising: a cartridge assembly designed to be operatively engageable and/or positionable In a top portion of a coal mill, the cartridge assembly includes: at least one coal flow vane, and at least one drive or actuating device of each coal flow vane, wherein the at least one drive or actuating device is in operation The upper portion may be coupled to a coal flow vane, wherein the position of the cartridge assembly is selected such that the at least one coal flow vane may affect the output of the pulverized coal in at least one of the outlet tubes of the coal mill.

Another aspect of the present invention provides a system for controlling one or more coal flow blades by an internal control system, the internal control system comprising: a cartridge assembly designed to be operatively engageable and/or positionable in a In a top portion of the coal mill, the cartridge assembly comprises: at least two coal flow vanes, and at least one drive or actuating device of each coal flow vane, wherein the at least one drive or actuating device is operationally Coupling to a coal flow blade, wherein the position of the cartridge assembly is selected such that the at least one coal flow blade can affect the coal grinding The pulverized coal output in at least one of the outlet tubes of the machine, and wherein the at least two pieces of coal flow vanes are positioned at equal intervals around the outer surface of a coal inlet tube of the coal mill.

Another aspect of the present invention provides a method for controlling coal output of a plurality of coal outlet pipes in a coal mill, the method comprising the steps of: modifying or modifying a portion of a coal mill with a cylinder assembly, the cylinder The assembly is designed to be operatively engageable and/or positionable in a top of a coal mill, the cartridge assembly comprising: at least one coal flow blade; and at least one drive or actuation of each coal flow blade Apparatus, wherein the at least one drive or actuating device is operatively coupled to a coal flow blade; and independently or in combination controlling the at least one coal flow blade to modify or control at least one coal within the coal mill The amount of coal exiting the outlet, wherein the position of the cartridge assembly is selected such that the at least one coal flow blade can affect the output of the pulverized coal in at least one of the outlet tubes of the coal mill.

Various novel features of the invention are set forth in the appended claims and form a part of this disclosure. For a further understanding of the present invention, its operational advantages, and the particular advantages thereof,

The present invention relates to a technical field of coal flow in the exit portion of a coal mill, and more particularly to a novel and useful system/device for controlling the position of one or more coal flow vanes in the upper portion of the coal mill, Method and drive device. The system and/or device according to the present invention uses an insertable position in the mill The "cylinder" in the turret at the top of the coal machine allows the control of one or more coal flow blades by an internal control system/means. In a particular embodiment, the "cylinder" according to the present invention surrounds the original coal inlet tube and can be inserted into a turret at the top of a coal mill. The present invention again allows control by an internal control system/means One or more coal flow blades.

Referring to the drawings, wherein like reference numerals refer to the same elements, particularly FIGS. 1 through 6, which disclose the top housing of the mill and the swing valve assembly (see FIG. 1) in accordance with an embodiment of the present invention. An isometric view (partially a section); a plan view of Figure 1 (see Figure 2); a section taken along section line 3-3 of Figure 2 (see Figure 3); and a section line 4-4 along Figure 2. A cross-sectional close-up view (see Fig. 4) of a cartridge assembly in accordance with an embodiment of the present invention is obtained, the cartridge assembly having a drive.

As shown in Figure 1, the top of the coal mill 100 is modified in accordance with an embodiment of the present invention, wherein the coal mill 100 includes a top outer casing and associated structure 102, a swing valve housing and associated structure 104, and a swing valve housing And the associated structure 104 includes a plurality of coal outlets designed to be coupled to a plurality of coal outlet pipes 106 (see FIG. 3, for simplicity, only one coal outlet pipe is shown), and a drum assembly 108 (see FIG. 4). . Figures 1 and 2 show only the corresponding outlets in which a plurality of coal outlet pipes 106 are located.

In one embodiment, the cartridge assembly 108 is designed to be sleeved around the outer surface of the coal inlet tube 110, either before or after, wherein the cartridge assembly 108 extends from the outer surface of the top plate 112 of the swing valve housing 104 to a location Appropriate points below the bottom of the swing valve housing 104 (see Figure 3). As shown in Figures 1 to 4, in one embodiment, the cartridge assembly 108 comprises four leaves. The sheets 114 are spaced apart from each other by approximately 90 degrees. It should be noted, however, that the invention is not limited to any particular number of blades, or to a particular space between individual blades. Rather, the invention encompasses the use of any number of blades equal to one or more, and any configuration of two or more blades (regardless of the size of the surrounding space), such as the use of a circular coal inlet tube. In other words, when the cartridge assembly 108 in accordance with the present invention has two or more blades 114, the spacing between adjacent blades 114 can be a regular or irregular spacing at any angle.

Each blade of the cartridge assembly 108 includes at least one drive or actuation device 116 in addition to one or more blades 114. In one embodiment, as shown in Figures 1-4, the one or more drive or actuating devices 116 are rack and pinion drives, each having a control device 118 (e.g., a linear electric actuator). The rack 120 is designed to be operatively engageable with a pinion 122 and is adjustable by the fixed position and by the guide roller 124. The respective vanes 114 are coupled to the rack and pinion drive 116 via a shaft 126 and are designed to prevent the flow of coal dust into the respective drive unit 116 due to the presence of at least one bearing 128 and a rear of the bearing 128. The cover is so seduce as needed. In another embodiment, control device 118 can be any suitable type of control device as long as it is the control required to perform the rack and pinion control device 118 of FIGS. 1-4. Such control device 118 may include an automatic or manual mechanical control device, or an automatic or manual electrical control device.

In one embodiment, the cartridge assembly 108 is designed to wrap around the outer surface of the coal inlet tube 110 and has only one concentric cylinder. The tube 130 has an inner surface that is slightly spaced from the outer surface of the coal inlet tube 110. The space formed between the concentric cartridge assembly tube 130 and the outer surface of the coal inlet tube 110 should be sufficient to allow for the assembly and operation of one or more of the drive or actuation devices 116 of each blade 114. In one embodiment, a space 132 (see FIG. 5) is created between the concentric cartridge assembly tube 130 and the outer surface of the coal inlet tube 110 (see FIG. 5) by means of a shadow cone 134 and a suitable sealing device at the coal inlet. The outer surface of the tube 110 seals the edge of the shadow cone 134, thereby preventing contamination of the coal dust. Such suitable sealing means include, but are not limited to, weldments, adhesives, anti-wear seal tapes, epoxy bonded graphite cloth, and the like. It will be apparent to those skilled in the art that the type of sealing means used to seal the bottom end of the cartridge assembly 108 is largely related to the nature of the material used to make the coal inlet tube 110. In the case where the coal inlet pipe 110, the concentric drum assembly pipe 130, and the shielding cone 134 are all made of a compatible metal or alloy composite, a suitable sealing device is a welded piece.

In another embodiment, the cartridge assembly 108 can be formed from two concentric cartridge assemblies. In this particular embodiment, the cartridge assembly 108 has an inner concentric cartridge assembly tube and an outer concentric cartridge assembly tube; the inner concentric cartridge assembly conduit is designed to surround the coal inlet conduit 110 The outer surface is sleeved and the outer concentric cartridge assembly is designed to be spaced from the outer surface of the inner concentric cartridge assembly by a suitable space. The space formed should be sized to allow for the assembly and operation of one or more of the drive or actuation devices 116 of each blade 114. In this particular embodiment, the bottom of the cartridge assembly 108 can be sealed by a flat plate instead of the shadow cone 134.

Figure 5 is an isometric close up view of the embodiment of the cartridge assembly 108 of Figures 1 through 4. Figure. Figure 5 shows various portions of the cartridge assembly of the present invention wherein the cartridge assembly has at least one blade 114. It should be noted that the present invention is not limited to any particular number of blades, as long as the cartridge assembly 108 has at least one blade 114 and a controllable blade 114. In another embodiment, the number 114 of blades used by the cartridge assembly 108 is equal to the number of coal outlet tubes 106. In another embodiment, two or more blades 114 may be used in the cartridge assembly 108, wherein the total number of blades 114 is selected based on the number 106 of outlet tubes.

Referring to Figure 6, Figure 6 is a close-up view of a cross-sectional view of one or more of the blades 114 of the cartridge assembly 108 including at least one drive or actuating device 116 of each blade, in accordance with an alternative embodiment of the present invention, The drive or actuating device is a chain and sprocket drive. In this particular embodiment, one or more of the chain and sprocket drive members that act as drive or actuating means 116 include a chain 150 secured to the top and bottom ends by sprocket wheels 152 and 154, respectively. In this particular embodiment, the sprocket 152 is a drive sprocket and is controlled to be movable by the rotary electric actuator 156. In addition, there is also a means by which the chain adjuster 158 can be used to adjust the tension of the chain 150. As shown in FIG. 6, the sprocket 154 is operatively coupled to a shaft 126 of a blade 114. In addition, a protective cover plate located behind the bearing 128 is designed to prevent coal dust from flowing into the respective drive unit of this embodiment.

Referring to Figure 7, Figure 7 is a cross-sectional close-up view of the top of a coal mill 200 equipped with at least one side feed raw coal inlet pipe 210, modified and/or equipped with a cartridge according to another embodiment of the present invention. Into 108. In this particular embodiment, the cartridge assembly 108 is not surrounded, includes and/or is operatively engageable One or more coal inlet pipes 210.

8 and 9 are close-up views of various portions of the coal mill 100. Referring to Figure 8, Figure 8 is a top elevational view of the pulverizer 100 having a central coal inlet tube 110, showing the pulverizer having the cartridge assembly of the embodiment of the present invention shown in Figure 2 The number of blades caused by the cylinder assembly is the same as the number of coal outlet pipes provided on the coal mill. Referring to Figure 9, Figure 9 is a top plan view of the cartridge assembly of the present invention disposed within the coal mill of Figure 8.

Referring to Figures 10 and 11, Figures 10 and 11 disclose a particular embodiment in which the number of vanes 114 is less than the number of coal outlet tubes 106. In the specific embodiment of Figures 10 and 11, the number of blades is six and the number of coal outlet pipes is eight. Thus, in this particular embodiment, the number of vanes 114 can be equal to, less than, or even greater than the number of coal outlet tubes. The use of the number of leaves, its control plan, and its placement are related to several factors, including, but not limited to, the amount of coal from the individual coal outlets in the coal mill; Flame characteristics of burners connected to individual coal outlet pipes; and/or various physical and/or engineering analyses (eg, flow analysis, output analysis, etc.). With respect to the present invention, the cartridge assembly has all of the specific embodiments of two or more blades, each of which can be independently controlled, or combined with one or more other blades, or controlled together .

As mentioned above, a plurality of externally adjustable vanes 114 are arranged between the classifier and the mill exit (see, for example, Figures 1, 3 to 7, 10 to 12 and 14). In a neutral adjustment, one or more of the blades 114 of the present invention are parallel to the spiral flow of the air/coal mixture. The blades may use at least one drive or actuation device 116 coupled to each blade 114 (as detailed above) The external actuators of the above) are individually and differentially adjusted to divert the air coal mixture flow path. Since the air is returned to the original state faster than the coal, the coal dust carried out per unit volume of the air flowing out of the mill can be changed. This change is achieved by using a cartridge assembly 108 that supports one or more blades 114, shaft 126, and bearing assembly 128. As mentioned above, various embodiments of the cartridge assembly 108 are designed to protect at least one drive or actuating device 116 of each blade 114 from the impact of abrasive coal dust traveling through the classifier outlet cylinder (see Figure 3). . The design of the cartridge assembly 108 can be used on a mill with a central coal inlet tube or a mill with a raw coal inlet tube with side feed. In addition to the drive or actuating device 116 described above, other methods of moving the blade within the scope of the present invention include, but are not limited to, a worm driven by an external actuator.

Referring to Figures 12 through 14, the various figures show various other views and/or embodiments of the present invention. In particular, Figure 12 is a cross-sectional close-up view of a cartridge assembly of the present invention, wherein the cartridge assembly surrounds a central coal inlet tube disposed on the coal mill. 13 is a plan view of a cartridge assembly of the present invention, wherein the cartridge assembly is surrounded by a central raw coal inlet pipe disposed on the coal mill, and wherein the blade assembly is driven by the blade The quantity is less than the number of coal outlet pipes located on the coal mill. Finally, Figure 14 is an isometric view of a cartridge assembly of the present invention, wherein the cartridge assembly surrounds a central raw coal inlet tube disposed on the coal mill.

Changing the coal dust load per unit volume of the main air flow can change the flow of coal flowing into each combustor without changing the main air flow. The velocity of the main air stream to the air/coal mixture exiting the burner fuel nozzle and at the burner It is extremely important in terms of total air dispersion, as both are extremely important for achieving combustion optimization.

In accordance with the above-described embodiments, the present invention eliminates any potential interference or conflict between any of the drive devices present in one or more coal flow blades and any swing valves (i.e., turrets) disposed within the upper interior of the coal mill. Those skilled in the art will appreciate that the present invention is not limited solely to low turrets or turretless coal mills. Conversely, the invention may be adapted for use on any coal mill where it is necessary to control one or more coal flow vanes from an internal surface.

In addition, the present invention can retrofit existing coal mills to allow for the systematic or individual control of coal in one or more coal outlet tubes within the coal mill by positioning one or more coal flow vanes.

While the present invention has been shown and described with respect to the specific embodiments of the present invention, it is intended to Other embodiments may be covered. In some embodiments of the invention, certain features of the invention may be advantageously utilized in the absence of the corresponding use of other features. Accordingly, all such changes and specific embodiments are still within the scope of the claimed invention.

100‧‧‧Pulverizer

102‧‧‧Top casing and related structures

104‧‧‧Swing valve housing and related structure

106‧‧‧ coal export pipe

108‧‧‧匣Cylinder assembly

110‧‧‧ coal inlet pipe

112‧‧‧ top board

114‧‧‧ blades

116‧‧‧Drive or actuating device

118‧‧‧Control device (linear electric actuator)

120‧‧‧ rack

122‧‧‧ pinion

124‧‧‧guide roller

126‧‧‧Axis

128‧‧‧ bearing

130‧‧‧匣管管管

132‧‧‧ Space

134‧‧‧shading cone

150‧‧‧Chain

152‧‧‧Sprocket

154‧‧‧Sprocket

156‧‧‧Rotary electric actuator

158‧‧‧Chain adjuster

200‧‧‧Pulverizer

210‧‧‧ side feed original coal inlet pipe

1 is an isometric view of a top shell and a swing valve assembly of a mill for providing a system/device for controlling the position of one or more coal flow vanes in the upper portion of a coal mill, in accordance with an embodiment of the present invention. (partially a section).

Figure 2 is a plan view of the embodiment of Figure 1.

Figure 3 is a cross-sectional view taken along line 3-3 of Figure 2 .

4 is a close-up, cross-sectional view of FIG. 3 of the cartridge assembly in accordance with an embodiment of the present invention taken along section line 4-4 of FIG.

Figure 5 is an isometric, close-up view (partially section) of the top of a coal mill incorporating a cartridge assembly in accordance with an embodiment of the present invention.

6 is a cross-sectional close-up view of the top of a coal mill incorporating a cartridge assembly in accordance with an embodiment of the present invention.

Figure 7 is a cross-sectional close-up of the top of a coal mill equipped with a side feed raw coal inlet pipe, equipped with a cartridge assembly in accordance with another embodiment of the present invention.

Figure 8 is a top elevational view of the interior of a coal mill having a central coal inlet tube with a central feed, showing a coal mill having a cartridge assembly of the embodiment of the invention shown in Figure 2, wherein the cylinder assembly The number of blades that are actuated is the same as the number of coal outlet pipes provided on the coal mill.

Figure 9 is a top plan view of the cartridge assembly of the present invention disposed within the coal mill of Figure 8.

Figure 10 is a close-up view of an isometric, cross-sectional view of a cartridge assembly in accordance with another embodiment of the present invention, wherein the number of blades driven by the cartridge assembly is less than the number of coal outlet tubes disposed on the coal mill. Quantity.

Figure 11 is a close-up view of an isometric, cross-sectional view of a cartridge assembly in accordance with another embodiment of the present invention, wherein the number of blades driven by the cartridge assembly is less than that of the coal outlet tube disposed on the coal mill. Quantity.

Figure 12 is a close-up view showing a section of the cartridge assembly of the present invention, showing 匣 The cartridge assembly surrounds a central raw coal inlet pipe located on the coal mill.

Figure 13 is a plan view of the cartridge assembly of the present invention, showing the cartridge assembly surrounding a central raw coal inlet tube disposed on the coal mill, and wherein the number of blades driven by the cartridge assembly is set at The number of coal outlet pipes on coal mills is two.

Figure 14 is an isometric view of the cartridge assembly of the present invention showing the cartridge assembly surrounding a central raw coal inlet tube disposed on the coal mill.

100‧‧‧Pulverizer

102‧‧‧Top casing and related structures

104‧‧‧Swing valve housing and related structure

110‧‧‧ coal inlet pipe

112‧‧‧ top board

114‧‧‧ blades

118‧‧‧Linear electric actuator

120‧‧‧ rack

122‧‧‧ pinion

124‧‧‧guide roller

134‧‧‧shading cone

Claims (21)

A system for controlling coal flow in a coal mill by an internal control system, the internal control system comprising: a cartridge assembly designed to be operatively engageable and/or positioned on top of the coal mill The cartridge assembly includes: at least two pieces of coal flow blades; and at least one driving or actuating device of each of the coal flow blades, wherein the at least one driving or actuating device is operatively coupled to a coal The flow vane, wherein the position of the cartridge assembly is selected such that each of the at least two coal flow vanes can affect the pulverized coal output in at least one of the outlet tubes of the coal mill. The system of claim 1, wherein the number of coal flow blades is the same as the number of coal outlet pipes in the coal mill. The system of claim 1, wherein the number of coal flow blades is less than the number of coal outlet pipes in the coal mill. The system of claim 1, wherein the number of coal flow blades is greater than the number of coal outlet pipes in the coal mill. A system as claimed in claim 1, wherein each coal flow blade is designed to be independently actuated. The system of claim 1, wherein the at least one drive or actuating device of each coal flow blade is selected from the group consisting of a rack and pinion drive, a chain and a sprocket drive, or the like. Such as the system of claim 1 of the patent scope, wherein the cylinder assembly system It is designed to be operatively engaged or surrounding the coal inlet tube at the inner portion of the coal mill. A system for controlling a coal flow vane in a coal mill by an internal control system, the internal control system comprising: a cartridge assembly designed to be operationally engageable and/or positioned in the coal mill In the top portion, the cartridge assembly includes: at least two pieces of coal flow blades; and at least one driving or actuating device of each of the coal flow blades, wherein the at least one driving or actuating device is operatively coupled to the a coal flow blade, wherein the position of the cartridge assembly is selected such that each of the at least two coal flow blades can affect pulverized coal output in at least one outlet pipe of the coal mill, and wherein the at least two pieces of coal The flow vanes are positioned at equal intervals around the outer surface of a coal inlet tube of the coal mill. The system of claim 8, wherein the number of coal flow blades is the same as the number of coal outlet pipes in the coal mill. The system of claim 8, wherein the number of coal flow blades is less than the number of coal outlet pipes in the coal mill. The system of claim 8, wherein the number of coal flow blades is greater than the number of coal outlet pipes in the coal mill. A system of claim 8 wherein each of the coal flow vanes is designed to be independently actuated. The system of claim 8 wherein the at least one drive or actuating device of each coal flow blade is selected from the group consisting of a rack and pinion drive A combination of pieces, chains and sprocket drives or the like. A system of claim 8 wherein the cartridge assembly is designed to be operatively engageable or surrounding the coal inlet tube at an interior portion of the coal mill. A method for controlling coal output of a plurality of coal outlet pipes in a coal mill, the method comprising the steps of: modifying or modifying a portion of the coal mill with a drum assembly, the drum assembly being designed to Operatively engageable and/or positioned in a top portion of the coal mill, the cartridge assembly comprising: at least two coal flow blades; and at least one drive or actuation device of each coal flow blade, wherein the at least a drive or actuating device operatively coupled to a coal flow blade; and independently or in combination controlling the at least two coal flow blades for modifying or controlling at least one coal outlet pipe within the coal mill The amount of coal, wherein the position of the cartridge assembly is selected such that each of the at least two coal flow blades can affect the pulverized coal output in at least one of the outlet tubes of the coal mill. The method of claim 15, wherein the number of coal flow blades is the same as the number of coal outlet pipes in the coal mill. The method of claim 15, wherein the number of coal flow blades is less than the number of coal outlet pipes in the coal mill. The method of claim 15, wherein the coal flow blade The quantity is greater than the number of coal outlet pipes in the coal mill. The method of claim 15, wherein each coal flow blade is designed to be independently actuated. The method of claim 15, wherein the at least one drive or actuating device of each coal flow blade is selected from the group consisting of a rack and pinion drive, a chain and a sprocket drive, or the like. The method of claim 15, wherein the cartridge assembly is designed to be operatively engaged or surrounding the coal inlet tube at an interior portion of the coal mill.