Impurity removal device for double-inlet and double-outlet steel ball type coal mill

Abstract

The utility model discloses an impurity removal device for a double-inlet and double-outlet steel ball type coal mill in the technical field of coal mills, the impurity removal device comprises a coal mill body and a coal drop pipe, the bottom of the coal drop pipe is communicated with the coal mill body, an impurity removal mechanism is arranged at the upper position of the middle of the coal drop pipe, and the impurity removal mechanism comprises a filter bin and an air blower; a material guiding pipe is arranged between the side wall of the filtering bin and the coal falling pipe, the two ends of the material guiding pipe communicate with the filtering bin and the coal falling pipe correspondingly, the air blower is located on the opposite side of the filtering bin, an air blowing opening of the air blower and the material guiding pipe are located on the same horizontal plane, and a filtering net is detachably connected into the filtering bin. And the filter screen is positioned below the material guide pipe. The device can effectively separate light and soft woven bags, straw, plastics and other impurities from fire coal, the purity of the fire coal can be effectively improved, the situation that the separator is blocked is avoided, the maintenance time of the coal mill is effectively shortened, and the working efficiency of the coal mill is improved.

Description

Technical Field

[0001] This utility model belongs to the field of coal mill technology, and specifically relates to a purification device for a double-inlet double-outlet steel ball coal mill. Background Technology

[0002] The double-inlet, double-outlet ball mill is an advanced coal pulverizing equipment widely used in thermal power plants and other industrial sectors requiring large quantities of pulverized coal. The "double-inlet, double-outlet" designation refers to the mill's two feed inlets and two discharge outlets. Simultaneous feeding through the two inlets increases the mill's processing capacity, while the simultaneous discharge of pulverized coal through the two outlets makes the entire grinding process more uniform and efficient, thus improving energy utilization efficiency. Furthermore, the double-inlet, double-outlet design allows the mill to process more raw materials in the same amount of time, thereby increasing output. It is most commonly found in thermal power plants and steel smelting.

[0003] However, some existing thermal power plants use coal of low quality for power generation, which contains more impurities, such as soft and light debris like woven bags, straw, and plastics. These items can easily clog the filter mechanism of the separator when the coal mill is working, causing the separator to be unable to operate safely and stably. This directly affects the grinding efficiency and coal powder quality of the coal mill. When repairing a clogged separator, it can also affect the normal operation of the unit, seriously reduce the working efficiency of the coal mill, and easily cause safety hazards. Utility Model Content

[0004] This utility model aims to provide a purification device for a double-inlet, double-outlet ball mill, in order to solve the problem that excessive impurities in the coal cause blockage of the mill's separator, thereby affecting the mill's working efficiency and the quality of pulverized coal.

[0005] The impurity removal device for the double-inlet, double-outlet ball mill in this solution consists of a mill body and a coal chute. The bottom of the coal chute is connected to the mill body, and a coal feeder is located at the top of the coal chute. A coal mixing box is located at the middle end of the coal chute near the mill body. An impurity removal mechanism is located at the upper middle part of the coal chute. The impurity removal mechanism includes a filter chamber and a blower. A guide pipe is provided between the side wall of the filter chamber and the coal chute, and both ends of the guide pipe are connected to the filter chamber and the coal chute, respectively. The blower is located on the opposite side of the filter chamber, and the blower's air outlet and the guide pipe are on the same horizontal plane. A filter screen is detachably connected inside the filter chamber and is located below the guide pipe.

[0006] The working principle and beneficial effects of this solution are as follows: During use, the coal feeder evenly feeds the coal from the coal drop pipe into the coal mixing box for mixing, and then it enters the coal mill body for grinding. Before the coal falls into the coal mixing box, the blower is started and the blower's air force is adjusted to only be able to blow soft and light impurities such as woven bags, straw, and plastics. When the coal passes through the impurity removal mechanism, the blower blows the impurities in the coal into the guide pipe and into the filter chamber. Then, they fall into the filter screen below for collection. After a certain amount is collected, the filter screen can be removed, the impurities inside can be poured out, and then it can be reinstalled to continue the subsequent filtration work.

[0007] Beneficial effects: This device can separate impurities in coal before mixing. By blowing air, it can effectively separate lighter and softer impurities such as woven bags, straw, and plastics from the coal without affecting the quality of the coal. This can effectively improve the purity of the coal and prevent impurities from entering the coal mill body and then entering the separator, which would cause blockage. This effectively reduces the maintenance time of the coal mill and speeds up the working efficiency of the coal mill.

[0008] Furthermore, a through groove is provided at the top of the filter chamber, and a movable door is hinged within the through groove. The movable door allows workers to easily remove and discard impurities that have fallen into the filter screen after separation and filtration.

[0009] Furthermore, an exhaust fan is connected to the bottom of the filter chamber. The exhaust fan helps impurities entering the filter chamber to settle quickly, preventing them from being blown back into the coal chute by the blower.

[0010] Furthermore, a fixing ring is provided in the middle of the filter chamber. The fixing ring is detachably connected to the filter chamber and is located below the feed tube. The filter screen is fixedly connected to the fixing ring. When the filter screen is full of impurities, the fixing ring and the filter screen fixedly connected below can be directly removed from the filter chamber, making it easy to remove the filter screen.

[0011] Furthermore, a baffle is slidably connected to the side wall of the coal chute, and a through groove is opened at the end of the guide pipe near the coal chute. The baffle can slide into the through groove to cut off the guide pipe. The baffle can be placed into the guide pipe when cleaning is required to seal the guide pipe and prevent coal slag from being blown into the guide pipe during the cleaning of the filter chamber, which would affect the health of the workers.

[0012] Furthermore, the mesh openings of the filter screen are smaller than those of impurities and coal slag, allowing only airflow. These smaller openings prevent coal slag and impurities from falling into the exhaust fan below, which could cause malfunctions. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the impurity removal device for a double-inlet, double-outlet ball mill of this utility model;

[0014] Figure 2 for Figure 1 A partially enlarged sectional view of section A. Detailed Implementation

[0015] The following detailed description illustrates the specific implementation method:

[0016] The reference numerals in the accompanying drawings of the instruction manual include: 1. Coal mill body; 2. Coal mixing box; 3. Coal drop pipe; 4. Impurity removal mechanism; 41. Feed guide pipe; 42. Movable door; 43. Filter chamber; 44. Fixing ring; 45. Filter screen; 46. Exhaust fan; 47. Air outlet pipe; 48. Blower; 49. Baffle plate; 5. Coal feeder; 6. Separator.

[0017] The basic implementation examples are as follows: Figures 1-2 As shown: A cleaning device for a double-inlet, double-outlet ball mill includes a mill body 1, a coal drop pipe 3, a coal mixing box 2, a coal feeder 5, and a separator 6. The coal drop pipe 3 is located at both ends of the mill body 1 and is connected to the inside of the mill body 1. The coal drop pipe 3 extends upward. The coal feeder 5 is located at the end of the coal drop pipe 3 away from the mill body 1. The coal mixing box 2 is located in the lower middle part of the coal drop pipe 3.

[0018] A cleaning mechanism 4 is provided between the coal feeder 5 and the coal mixing box 2. The cleaning mechanism 4 includes a blower 48 and a filter chamber 43. The filter chamber 43 and the blower 48 are symmetrically arranged on the left and right sides of the coal drop pipe 3. The air outlet of the blower 48 is connected to an air outlet pipe 47, which is connected to the coal drop pipe 3. A guide pipe 41 is provided between the filter chamber 43 and the coal drop pipe 3. The two ends of the guide pipe 41 are connected to the filter chamber 43 and the coal drop pipe 3, respectively. A partition 49 is slidably connected to the side wall of the coal drop pipe 3. The top of the guide pipe 41 is provided with a partition plate. The filter chamber 43 has an inlet and outlet through slot 49, and the partition 49 can slide into the through slot of the guide pipe 41. The top of the filter chamber 43 has a through slot, and a movable door 42 is hinged in the through slot. A fixing ring 44 is provided in the inner ring of the filter chamber 43. The fixing ring 44 is detachably connected to the filter chamber 43. The fixing ring 44 is located below the guide pipe 41. A filter screen 45 is fixedly connected to the fixing ring 44. The filter screen 45 completely surrounds the bottom of the filter chamber 43. A blower 46 is provided at the bottom of the filter chamber 43. The exhaust port of the blower 46 is located inside the filter chamber 43.

[0019] The specific implementation process is as follows: During use, the coal feeder 5 evenly feeds coal into the coal drop pipe 3. At the same time, the blower 48 is adjusted to a size that can only blow away impurities and is turned on. When the coal and soft and light impurities such as woven bags, straw, and plastics pass through the impurity removal mechanism 4, the blower 48 blows air into the coal drop pipe 3, blowing the lighter impurities into the guide pipe 41. The impurities then enter the filter chamber 43 along with the guide pipe 41. After entering the filter chamber 43, the exhaust fan 46 starts to exhaust air, drawing the impurities scattered in the filter chamber 43 to the filter screen 45 below for collection, preventing the impurities from re-entering the coal drop pipe 3 and thus into the coal mill body 1, clogging the separator 6. The operator can periodically slide the partition 49 to close the guide pipe 41, and then open the movable door 42 to remove the fixing ring 44 along with the filter screen 45 from the filter chamber 43 for cleaning and replacement.

[0020] The above descriptions are merely embodiments of this utility model, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A purification device for a double-inlet, double-outlet ball mill, comprising a mill body and a coal chute, wherein the bottom of the coal chute is connected to the mill body, a coal feeder is provided at the top of the coal chute, and a coal mixing box is provided at the middle end of the coal chute near the mill body, characterized in that: A cleaning mechanism is provided at the upper middle part of the coal chute. The cleaning mechanism includes a filter chamber and a blower. A guide pipe is provided between the side wall of the filter chamber and the coal chute. The two ends of the guide pipe are connected to the filter chamber and the coal chute, respectively. The blower is located on the opposite side of the filter chamber. The blower's air outlet and the guide pipe are on the same horizontal plane. A filter screen is detachably connected inside the filter chamber. The filter screen is located below the guide pipe.

2. The impurity removal device for a double-inlet, double-outlet ball mill according to claim 1, characterized in that: The top of the filter chamber is provided with a through groove, and a movable door is hinged in the through groove.

3. The impurity removal device for a double-inlet, double-outlet ball mill according to claim 2, characterized in that: The bottom of the filter chamber is connected to an exhaust fan.

4. The impurity removal device for a double-inlet, double-outlet ball mill according to claim 3, characterized in that: A fixing ring is provided in the middle of the filter chamber. The fixing ring is detachably connected to the filter chamber. The fixing ring is located below the feed tube. The filter screen is fixedly connected to the fixing ring.

5. The impurity removal device for a double-inlet, double-outlet ball mill according to claim 4, characterized in that: A partition is slidably connected to the side wall of the coal chute, and a through groove is opened at one end of the guide pipe near the coal chute. The partition can slide into the through groove to cut off the guide pipe.

6. The impurity removal device for a double-inlet, double-outlet ball mill according to claim 5, characterized in that: The mesh openings of the filter screen are smaller than those for impurities and slag, allowing only air to pass through.

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