Steel ball adding device for steel ball coal mill of thermal power plant

Abstract

The utility model discloses a steel ball adding device for a steel ball coal mill of a thermal power plant. The steel ball adding device comprises a buffer box, a ball inlet header pipe, a ball inlet branch pipe and two ball inlet side pipes, the buffer box is communicated with the ball inlet header pipe; a ball distributing mechanism is installed on the ball distributing box and used for sequentially pushing steel balls in the ball distributing pipes into the ball discharging pipes at the corresponding positions. And a buffer plate is movably hinged to one side in the buffer box. According to the requirements for the diameter and the number of the steel balls added by the coal mill, the steel balls in the corresponding ball distributing pipes can be fed into the buffer boxes through the through holes by the ball distributing mechanisms, the buffer boxes can buffer the impact force caused by falling of the steel balls, then the steel balls enter the ball inlet bin of the coal mill through the ball inlet header pipe, and the operation is repeated. The steel balls with the corresponding number and diameter can be fed into the coal mill, the steel ball adding precision is improved, meanwhile, damage in the steel ball adding process can be reduced, periodic fluctuation of the performance of the coal mill is reduced, and the quality of pulverized coal is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of coal mill equipment in thermal power plants, and more specifically, to a steel ball adding device for a steel ball coal mill in thermal power plants. Background Technology

[0002] A ball mill is a device used in coal-fired power plants to supply pulverized coal to pulverized coal-fired boilers. Coal is fed into the ball mill, and steel balls of a certain diameter are added to the mill in a specific ratio. During normal operation, hot air dries the raw coal and carries the pulverized coal inside the mill. The mill cylinder rotates at a certain speed, and corrugated or stepped liners are installed inside the mill cylinder. As the mill cylinder rotates, the raw coal and steel balls are carried to a certain height and then fall in a parabolic trajectory. The raw coal is crushed, ground, and pulverized by steel balls of different diameters, and then carried out of the mill cylinder by hot air into a pulverized coal separator. The pulverized coal separator carries the qualified pulverized coal into the boiler furnace burner for combustion, while the unqualified pulverized coal is returned to the inside of the mill through the return pipe and the air lock for further grinding.

[0003] The initial loading of the 4060 type double-inlet double-outlet ball mill is 60 tons, with a ball diameter ratio of 30mm:40mm:50mm = 1:1:1. However, during normal operation, the ball mill is filled with a uniform mixture based on the mill current (generally reduced by 10A or more). This process lacks precision, failing to add balls of specific diameters according to the ball wear mechanism and pulverized coal quality. This results in periodic fluctuations in mill performance, causing the pulverized coal quality to fail to meet the boiler's high-efficiency combustion requirements. Utility Model Content

[0004] The purpose of this invention is to provide a steel ball adding device for a coal mill in a thermal power plant that can accurately add steel balls.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a steel ball adding device for a steel ball mill in a thermal power plant, comprising a ball inlet manifold and a ball mill ball inlet chamber connected to each other, and further comprising a buffer box, a ball inlet manifold, a ball inlet branch pipe and two ball inlet side pipes;

[0006] The buffer box is fixedly installed on the upper end of the ball manifold, and the buffer box is connected to the ball manifold.

[0007] The ball-in branch pipe and the two ball-in side pipes are all fixedly installed on the buffer box. The ball-in branch pipe and the two ball-in side pipes are connected to the buffer box. The upper end of the ball-in branch pipe and the two ball-in side pipes are all connected to the lower ball pipe. The upper end of the lower ball pipe is fixedly installed with a ball distribution box. The upper end of the ball distribution box is installed with a ball compartment. The lower end of the ball compartment is connected to the corresponding ball distribution box through the ball distribution pipe.

[0008] The ball-splitting box is equipped with a ball-splitting mechanism, which is used to push the steel balls in the ball-splitting tube into the corresponding lower ball tube in sequence.

[0009] The buffer plate is movably hinged to one side inside the buffer box.

[0010] Preferably, the ball-separating mechanism includes an electric push rod and a ball-separating plate. The electric push rod is fixedly installed at one end of the outside of the ball-separating box, and the ball-separating plate is located at one end of the inside of the ball-separating box. The other end of the inside of the ball-separating box has a through hole that connects to the lower ball tube. The piston shaft of the electric push rod is inserted into the ball-separating box and fixedly connected to the ball-separating plate. The surface of the ball-separating plate has a receiving opening located below the ball-separating tube, and the inner diameter of the receiving opening corresponds to the inner diameter of the ball-separating tube.

[0011] Preferably, the buffer plate is hinged to one side inside the buffer box via a torsion spring.

[0012] Preferably, a partition is fixedly installed on the upper surface of the buffer plate between the ball-side pipe and the ball-side branch pipe.

[0013] Preferably, the ball chambers 8 on the ball-scoring branch pipe and the two ball-scoring side pipes 5 are used to hold steel balls with diameters of 30mm, 40mm and 50mm, respectively.

[0014] Preferably, the inner diameters of the receiving openings 93 of the ball-scoring branch pipe and the ball-distributing plates 92 on the two ball-scoring side pipes are 30mm+4mm, 40mm+4mm, and 50mm+4mm, respectively.

[0015] Compared with the prior art, the advantages of this utility model are:

[0016] Based on the wear mechanism of steel balls of different diameters in the coal mill and the quality of pulverized coal, a steel ball addition model for the coal mill is established, including the addition amount of steel balls of various diameters. According to the required diameter and number of steel balls to be added to the coal mill, the steel balls in the corresponding ball distribution pipe can be sent into the buffer box through the through hole by the ball distribution mechanism. The buffer box can buffer the impact force of the falling steel balls. Then the steel balls enter the coal mill's ball chamber through the ball inlet manifold. By repeating the above operation, the corresponding number and diameter of steel balls can be sent into the coal mill, improving the accuracy of steel ball addition, reducing damage during the steel ball addition process, reducing the periodic fluctuation of coal mill performance, and improving the quality of pulverized coal. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a perspective view of a steel ball adding device for a steel ball coal mill in a thermal power plant, according to this utility model.

[0019] Figure 2 This is a cross-sectional view of a steel ball adding device for a steel ball coal mill in a thermal power plant, according to this utility model.

[0020] Figure 3 yes Figure 2 Enlarged schematic diagram of the structure at point A in the middle;

[0021] Figure 4 yes Figure 2 Enlarged schematic diagram of the structure at point B.

[0022] In the diagram: 1. Coal mill ball chamber; 2. Ball inlet manifold; 3. Buffer box; 31. Buffer plate; 32. Partition plate; 4. Ball inlet branch pipe; 5. Ball inlet side pipe; 6. Lower ball pipe; 7. Ball distribution box; 8. Ball chamber; 81. Ball distribution pipe; 82. Through hole; 9. Ball distribution mechanism; 91. Electric push rod; 92. Ball distribution plate; 93. Reception port. Detailed Implementation

[0023] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.

[0024] See Figures 1-4 As shown, this utility model provides a steel ball adding device for a steel ball mill in a thermal power plant, including a main ball inlet pipe 2 and a ball mill inlet chamber 1 connected to each other. The ball mill inlet chamber 1 is used to add steel balls into the ball mill. It also includes a buffer box 3, a main ball inlet pipe 2, a ball inlet branch pipe 4, and two ball inlet side pipes 5.

[0025] The buffer box 3 is fixedly installed on the upper end of the ball manifold 2, and the buffer box 3 is connected to the ball manifold 2.

[0026] The ball-scoring branch pipe 4 and the two ball-scoring side pipes 5 are all fixedly installed on the buffer box 3. The ball-scoring branch pipe 4 and the two ball-scoring side pipes 5 are connected to the buffer box 3. The upper ends of the ball-scoring branch pipe 4 and the two ball-scoring side pipes 5 are all connected to the lower ball pipe 6. The upper end of the lower ball pipe 6 is fixedly installed with the ball distribution box 7. The upper end of the ball distribution box 7 is installed with the ball compartment 8. The lower end of the ball compartment 8 is connected to the corresponding ball distribution box 7 through the ball distribution pipe 81.

[0027] The ball-splitting box 7 is equipped with a ball-splitting mechanism 9, which is used to push the steel balls in the ball-splitting tube 81 into the corresponding lower ball tube 6 in sequence.

[0028] The buffer plate 31 is movably hinged to one side of the inside of the buffer box 3, which cushions the falling steel ball.

[0029] In this embodiment, the ball-separating mechanism 9 includes an electric push rod 91 and a ball-separating plate 92. The electric push rod 91 is fixedly installed on one end of the outside of the ball-separating box 7, and the ball-separating plate 92 is located at one end inside the ball-separating box 7. The other end of the ball-separating box 7 has a through hole 82 that connects to the lower ball tube 6. The piston shaft of the electric push rod 91 is inserted into the ball-separating box 7 and fixedly connected to the ball-separating plate 92. The surface of the ball-separating plate 92 has a receiving opening 93 located below the ball-separating tube 81, and the inner diameter of the receiving opening 93 corresponds to the inner diameter of the ball-separating tube 81.

[0030] Furthermore, to increase or decrease the buffering effect of the buffer plate 31, in this embodiment, the buffer plate 31 is movably hinged to one side inside the buffer box 3 via a torsion spring.

[0031] Furthermore, to prevent multiple steel balls from falling into the buffer box 3 and colliding, thus reducing damage, in this embodiment, a partition 32 is fixedly installed on the upper surface of the buffer plate 31 between the ball-scoring side pipe 5 and the ball-scoring branch pipe 4.

[0032] In this embodiment, the ball chambers 8 on the ball inlet branch pipe 4 and the two ball inlet side pipes 5 are used to hold steel balls with diameters of 30mm, 40mm and 50mm respectively, to meet the steel ball requirements of the 4060 type double-inlet double-outlet steel ball coal mill.

[0033] In this embodiment, the inner diameters of the receiving openings 93 of the ball-scoring branch pipe 4 and the two ball-scoring side pipes 5 on the ball-dividing plate 92 are 30mm+4mm, 40mm+4mm and 50mm+4mm, respectively.

[0034] The specific operating steps are as follows: The steel balls in the ball chamber 8 enter the ball distribution tube 81 by gravity. According to the diameter and number of steel balls added to the coal mill, the electric push rod 91 is activated. When the receiving opening 93 of the ball distribution plate 92 is flush with the ball distribution tube 81, a steel ball inside will fall into the receiving opening 93. The electric push rod 91 retracts once to send the corresponding steel ball in the ball distribution tube 81 into the buffer box 3 through the through hole 82. The buffer plate 31 inside the buffer box 3 can buffer the impact force of the falling steel ball. Then the steel ball enters the coal mill ball chamber 1 through the ball inlet main pipe 2. Repeating the above operation can send the corresponding number and diameter of steel balls into the coal mill.

[0035] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, the patent owner may make various modifications or alterations within the scope of the appended claims, as long as they do not exceed the protection scope described in the claims of the present invention, they shall all be within the protection scope of the present invention.

Claims

1. A steel ball adding device for a coal mill in a thermal power plant, comprising a ball inlet manifold and a ball inlet chamber of the coal mill connected to each other, characterized in that: It also includes a buffer box, a main inlet pipe, inlet branch pipes, and two inlet side pipes; The buffer box is fixedly installed on the upper end of the ball manifold, and the buffer box is connected to the ball manifold. The ball-in branch pipe and the two ball-in side pipes are all fixedly installed on the buffer box. The ball-in branch pipe and the two ball-in side pipes are connected to the buffer box. The upper end of the ball-in branch pipe and the two ball-in side pipes are all connected to the lower ball pipe. The upper end of the lower ball pipe is fixedly installed with a ball distribution box. The upper end of the ball distribution box is installed with a ball compartment. The lower end of the ball compartment is connected to the corresponding ball distribution box through the ball distribution pipe. The ball-splitting box is equipped with a ball-splitting mechanism, which is used to push the steel balls in the ball-splitting tube into the corresponding lower ball tube in sequence. The buffer plate is movably hinged to one side inside the buffer box.

2. The steel ball adding device for a coal ball mill in a thermal power plant according to claim 1, characterized in that: The ball-splitting mechanism includes an electric push rod and a ball-splitting plate. The electric push rod is fixedly installed on one end of the outside of the ball-splitting box, and the ball-splitting plate is located at one end inside the ball-splitting box. The other end of the ball-splitting box has a through hole that connects to the lower ball tube. The piston shaft of the electric push rod is inserted into the ball-splitting box and fixedly connected to the ball-splitting plate. The surface of the ball-splitting plate has a receiving opening located below the ball-splitting tube, and the inner diameter of the receiving opening corresponds to the inner diameter of the ball-splitting tube.

3. The steel ball adding device for a coal ball mill in a thermal power plant according to claim 1, characterized in that: The buffer plate is mounted on one side inside the buffer box via a torsion spring hinge.

4. The steel ball adding device for a coal ball mill in a thermal power plant according to claim 3, characterized in that: A baffle plate is fixedly installed on the upper surface of the buffer plate between the ball-side tube and the ball-side branch tube.

5. A steel ball adding device for a coal ball mill in a thermal power plant according to claim 1, characterized in that: The ball chambers on the ball-scoring branch pipe and the two ball-scoring side pipes are used to hold steel balls with diameters of 30mm, 40mm, and 50mm, respectively.

6. The steel ball adding device for a coal ball mill in a thermal power plant according to claim 5, characterized in that: The inner diameters of the receiving openings of the ball-scoring branch pipe and the two ball-scoring side pipes are 30mm+4mm, 40mm+4mm, and 50mm+4mm, respectively.

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