Coal feeding system
By installing stainless steel steel plates on the inner wall of the coal pulverized coal silo of the coal feeding system and replacing the Roots fan as an air suspension fan, and combining the improved feeding device to add a locked air feeder combination for the rotor scale, the problems of unstable operation of the coal feeding system and high coal consumption are solved, and lower noise, energy consumption and coal consumption are achieved.
Patent Information
- Application Number
- CN202323520188.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-22
- Publication Date
- 2025-06-10
- Estimated Expiration
- 2033-12-22
AI Technical Summary
The existing coal feeding system is unstable, with high coal consumption, Roots fans are noisy, high energy consumption and high maintenance costs, and there is wall hanging phenomenon in the powdered coal bin, which is very risky.
Stainless steel plates are installed on the inner wall of the coal powder silo of the feeding mechanism of the kiln head and kiln tail combustion chamber to increase the finish to avoid the coal powder sling; replace the Roots fan as an air suspension fan to reduce noise and energy consumption, and improve the feeding device to add a locked air feeder combination for the rotor scale to improve feeding stability.
It reduces the noise and energy consumption of the coal feeding system, improves the stability and safety of the system, and reduces coal consumption and maintenance costs.
Smart Images
Figure CN222963972U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of coal feeding structures, in particular to a coal feeding system. Background Art
[0002] The existing coal feeding system has a simple structure. During use, our company found that the reason for its unstable operation during operation is mainly due to the following problems: ①. When operating normally, the raw coal powder and tail coal feeding fan is a Roots blower controlled by power frequency. During use, it has high noise, high energy consumption, high maintenance and repair costs. Moreover, the current of the Roots blower fluctuates greatly, increasing coal consumption and affecting the stable operation of the cement kiln system; ②. The feeding of the original head and tail coal powder bins is not smooth, and there is a wall hanging phenomenon. It needs to be manually cleaned 2-3 times a year, with a relatively high safety risk. Therefore, in order to improve production efficiency and reduce energy consumption, it is necessary to improve the existing coal feeding system. Summary of the Utility Model
[0003] The purpose of the utility model is to provide a coal feeding system to solve the problems of unstable operation and high coal consumption of the existing coal feeding system.
[0004] To solve the above technical problems, the utility model adopts the following technical solutions:
[0005] A coal feeding system includes a coal feeding mechanism for the kiln head combustion chamber and a coal feeding mechanism for the kiln tail combustion chamber. The coal feeding mechanism for the kiln head combustion chamber is connected to the kiln head combustion chamber of the cement kiln, and the coal feeding mechanism for the kiln tail combustion chamber is connected to the burner of the kiln tail decomposition furnace of the cement kiln. Stainless steel plates are installed on the inner walls of the conical parts of the kiln head coal powder bin of the coal feeding mechanism for the kiln head combustion chamber and the inner walls of the conical parts of the kiln tail coal powder bin of the coal feeding mechanism for the kiln tail combustion chamber. The air pressure providing structure of the coal feeding mechanism for the kiln tail combustion chamber is an air suspension blower, and a three-way coal distributor is also installed on the conical platform of the decomposition furnace.
[0006] Stainless steel plates are installed on the inner walls of the conical parts of the kiln head coal powder bin of the coal feeding mechanism for the combustion chamber and the inner walls of the conical parts of the kiln tail coal powder bin of the coal feeding mechanism for the kiln tail combustion chamber, increasing the smoothness of the inner walls of the coal powder bins and avoiding the wall hanging phenomenon of coal powder. Then, the original Roots blower is replaced with an air suspension blower. During operation, the noise is ≤70 decibels, no lubricating oil needs to be added, and the filter screen is replaced 3-4 times a year, greatly reducing the maintenance cost. Moreover, the air suspension blower has lower energy consumption and more stable feeding, greatly improving the stability of the operation of the cement kiln system and reducing coal consumption.
[0007] As a further preference of the present utility model, the feeding mechanism of the kiln head combustion chamber includes a kiln head pulverized coal bin, a kiln head pulverized coal conveying pipe, a first screw pump and a Roots blower. The kiln head pulverized coal conveying pipeline is arranged below the kiln head pulverized coal bin. A first rotor scale is arranged below the discharge end of the kiln head pulverized coal conveying pipeline. The discharge port of the first rotor scale is connected to the feed port of a first air-lock feeder. The first screw pump is arranged below the discharge port of the first air-lock feeder. The Roots blower is connected to the first screw pump.
[0008] The gap of the feeding device of the original head scale feeder is relatively large, and the instantaneous feeding amount is greatly affected by the change of bin pressure. The phenomenon of "coal flowing" often occurs, and the scale body swings greatly on site during coal flowing, which poses equipment hidden dangers. The original head scale feeder is changed to a combination of a rotor scale and an air-lock feeder. After commissioning during operation, the air leakage at the feeding device is solved, the frequent jamming effect is reduced, the number of times of stopping the raw mill is reduced, the power consumption of the raw material process and the oxygen content in the exhaust gas at the kiln tail are both reduced compared with before the transformation, and the operation effect is better. At the same time, the problem of large current fluctuation of the original head scale feeder and the large and small coal consumption are also solved, and the coal consumption is further reduced.
[0009] The original head scale is a Coriolis force scale. The working principle of the Coriolis force scale: According to the description of the Coriolis force acting on an object when it moves in a uniformly rotating reference system, a measuring disk is arranged inside the Coriolis force scale. Several measuring blades are arranged radially on the measuring disk. As shown in the following figure, the measuring disk makes a high-speed rotation driven by the main shaft of the motor. The material to be metered falls to the center of the measuring disk. After changing the flow direction through the distributing cone, it is captured by the blades and moves radially outward along the edge under the action of centrifugal force. During the movement, the material is affected by the radial frictional force Fr and the reverse centrifugal force Fx, as well as the tangential Coriolis force Fc. Fc causes a reaction movement torque M, while Fr and Fx do not generate reaction torques on the drive shaft. By measuring the torque of the Coriolis force Fc acting on the measuring disk, the mass flow rate of the material can be obtained. This design has the defects mentioned above.
[0010] As a further preference of the present utility model, the first rotor scale includes a first powder quantitative feeder and a first powder flowmeter weigher arranged in sequence from top to bottom. As a further preference of the present utility model, the diameter of the discharge port of the kiln head pulverized coal bin is 750 mm.
[0011] The diameter of the discharge port of the original kiln head pulverized coal bin is changed from 500 mm to 750 mm, so that the discharge can be better completed.
[0012] As a further preference of the present utility model, the feeding mechanism of the kiln tail combustion chamber includes a kiln tail pulverized coal bin, a tail coal conveying pipeline, a second screw pump, and an air suspension fan. The tail coal conveying pipeline is arranged below the kiln tail pulverized coal bin. A second rotor scale is arranged below the discharge end of the tail coal conveying pipeline. The discharge port of the second rotor scale is connected to the feed port of a second air lock feeder. The second screw pump is arranged below the discharge port of the second air lock feeder. The air suspension fan is connected to the second screw pump.
[0013] The gap of the feeding device of the original tail scale feeder was relatively large, and the instantaneous feeding amount was greatly affected by the change of bin pressure. The phenomenon of "coal flowing" often occurred, and the scale body swung greatly on site during coal flowing, which posed potential equipment hazards. The original tail scale feeder was changed to a combination of a rotor scale and an air lock feeder. After commissioning during operation, the air leakage at the feeding device was solved, the frequent jamming and blocking effects were reduced, the number of times of stopping the raw mill was decreased, the power consumption of the raw material process and the oxygen content in the kiln tail waste gas were both reduced compared with before the transformation, and the operation effect was good. At the same time, the problem of large current fluctuation of the original tail scale feeder and the large and small coal consumption were also solved, the coal consumption was further reduced, and the problem that when the calorific value of the raw coal was relatively low, the amount of tail coal used was large and the conveying capacity of the tail scale was insufficient, affecting the stable operation of the cement kiln was also improved.
[0014] As a further preference of the present utility model, the second rotor scale includes a second powder quantitative feeder and a second powder flowmeter weigher arranged successively from top to bottom.
[0015] As a further preference of the present utility model, the diameter of the discharge port of the kiln tail pulverized coal bin is 750 mm.
[0016] The diameter of the discharge port of the original kiln tail pulverized coal bin was changed from 500 mm to 750 mm, so as to better complete the discharging. Compared with the prior art, the present utility model can achieve at least one of the following beneficial effects:
[0017] 1. Stainless steel plates were installed on the inner walls of the cones of the kiln head pulverized coal bin and the inner walls of the cones of the kiln tail pulverized coal bin of the feeding mechanism in the combustion chamber, increasing the smoothness of the inner walls of the pulverized coal bins, avoiding the phenomenon of pulverized coal hanging on the walls. Then, the original Roots blower was replaced with an air suspension fan. During operation, the noise ≤ 70 decibels, no lubricating oil needs to be added, and the filter screen is replaced 3 - 4 times a year, greatly reducing the maintenance cost. Moreover, the air suspension fan has lower energy consumption and more stable feeding, greatly improving the stability of the operation of the cement kiln system and reducing the coal consumption.
[0018] 2. The gap of the feeding device of the original head scale feeder is relatively large, and the instantaneous feeding volume is greatly affected by the change of bin pressure. The phenomenon of "coal flowing" often occurs, and the scale body swings greatly on site during coal flowing, posing equipment hazards. The original head scale feeder was changed to a combination of a rotor scale and a lock air feeder. After commissioning during operation, the air leakage at the feeding device and the influence of frequent jamming were solved, the number of times of stopping the material in the vertical mill was reduced, and the power consumption of the raw material process and the oxygen content in the kiln tail waste gas were both reduced compared with before the transformation. The operation effect is good. At the same time, the problem of large current fluctuation of the original head scale feeder and the large and small coal consumption is also solved, further reducing the coal consumption.
[0019] 3. The outlet diameter of the original coal powder bin at the kiln head was changed from 500 mm to 750 mm, which can better complete the discharging.
[0020] 4. The gap of the feeding device of the original tail scale feeder is relatively large, and the instantaneous feeding volume is greatly affected by the change of bin pressure. The phenomenon of "coal flowing" often occurs, and the scale body swings greatly on site during coal flowing, posing equipment hazards. The original tail scale feeder was changed to a combination of a rotor scale and a lock air feeder. After commissioning during operation, the air leakage at the feeding device and the influence of frequent jamming were solved, the number of times of stopping the material in the vertical mill was reduced, and the power consumption of the raw material process and the oxygen content in the kiln tail waste gas were both reduced compared with before the transformation. The operation effect is good. At the same time, the problem of large current fluctuation of the original tail scale feeder and the large and small coal consumption is also solved, further reducing the coal consumption. It also improves the problem that when the calorific value of the raw coal is relatively low, the consumption of tail coal is large and the conveying capacity of the tail scale is insufficient, affecting the stable operation of the cement kiln.
[0021] 5. The outlet diameter of the original coal powder bin at the kiln tail was changed from 500 mm to 750 mm, which can better complete the discharging. Brief Description of the Drawings
[0022] Figure 1 is a structural schematic diagram of the present utility model. Detailed Embodiment
[0023] To make the purpose, technical solution and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of the embodiments. Usually, the components of the embodiments of the present utility model described and shown in the drawings here can be arranged and designed in various different configurations.
[0024] Accordingly, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present utility model without creative efforts shall fall within the scope of protection of the present utility model.
[0025] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments may be combined with each other.
[0026] It should be noted that like reference numerals and letters indicate like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.
[0027] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.
[0028] In the description of the present utility model, it should also be noted that unless otherwise clearly defined and limited, the terms "set", "installed", "connected", "connected to" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model may be understood according to specific circumstances. Specific Embodiment 1:
[0030] Figure 1A coal feeding system is shown, which includes a coal feeding mechanism for the kiln head combustion chamber and a coal feeding mechanism for the kiln tail combustion chamber. The coal feeding mechanism for the kiln head combustion chamber is connected to the kiln head combustion chamber of the cement kiln, and the coal feeding mechanism for the kiln tail combustion chamber is connected to the burner of the decomposition furnace at the kiln tail of the cement kiln. Stainless steel plates are installed on the inner walls of the conical parts of the kiln head coal powder silo 1 of the coal feeding mechanism for the kiln head combustion chamber and the inner walls of the conical parts of the kiln tail coal powder silo 2 of the coal feeding mechanism for the kiln tail combustion chamber. The air pressure providing structure of the coal feeding mechanism for the kiln tail combustion chamber is an air suspension fan 3, and a coal distributor with one inlet and three outlets is also installed on the conical platform of the decomposition furnace.
[0031] Stainless steel plates are installed on the inner walls of the conical parts of the kiln head coal powder silo of the coal feeding mechanism for the combustion chamber and the inner walls of the conical parts of the kiln tail coal powder silo of the coal feeding mechanism for the kiln tail combustion chamber, increasing the smoothness of the inner walls of the coal powder silos and avoiding the phenomenon of coal powder hanging on the walls. Then, the original Roots blower was replaced with an air suspension fan. During operation, the noise is ≤70 decibels, no lubricating oil needs to be added, and the filter screen is replaced 3 - 4 times a year, greatly reducing the maintenance cost. Moreover, the air suspension fan has lower energy consumption and more stable feeding, greatly improving the operation stability of the cement kiln system and reducing the coal consumption. Specific Embodiment 2:
[0033] This embodiment further describes the coal feeding mechanism for the kiln head combustion chamber on the basis of Specific Embodiment 1. The coal feeding mechanism for the kiln head combustion chamber includes a kiln head coal powder silo 1, a kiln head coal powder conveying pipe 4, a first screw pump 5, and a Roots blower 6. The kiln head coal powder conveying pipe 4 is arranged below the kiln head coal powder silo 1. A first rotor scale 7 is arranged below the discharge end of the kiln head coal powder conveying pipe 4. The discharge port of the first rotor scale 7 is connected to the feed port of a first air lock feeder 8. The first screw pump 5 is arranged below the discharge port of the first air lock feeder 8. The Roots blower 6 is connected to the first screw pump 5.
[0034] The gap of the feeding device of the original head scale feeder is relatively large, and the instantaneous feeding amount is greatly affected by the change of the bin pressure. The phenomenon of "coal flowing" often occurs, and the scale body swings greatly on site during coal flowing, posing equipment hidden dangers. The original head scale feeder was changed to a combination of a rotor scale and an air lock feeder. After commissioning during operation, the air leakage at the feeding device and the influence of frequent jamming and blocking were solved, the number of times of stopping the raw mill was reduced, and the power consumption of the raw material process and the oxygen content in the kiln tail waste gas were both reduced compared with before the transformation, and the operation effect was good. At the same time, the problem of large current fluctuation of the original head scale feeder and the large and small coal consumption were also solved, further reducing the coal consumption.
[0035] The original head scale is a Coriolis scale. The working principle of the Coriolis scale: According to the description of the Coriolis force acting on an object when it moves in a uniformly rotating reference system, there is a measuring disc inside the Coriolis scale. Several measuring blades are arranged radially on the measuring disc. As shown in the figure below, the measuring disc makes a high-speed rotation driven by the main shaft of the motor. The material to be measured falls onto the center of the measuring disc. After changing the flow direction through the distribution cone, it is captured by the blades and moves radially outward under the action of centrifugal force. During the movement, the material is subjected to a radial frictional force Fr, a reverse centrifugal force Fx, and a tangential Coriolis force Fc. Fc causes a reaction movement torque M, while Fr and Fx do not generate a reaction torque on the drive shaft. By measuring the torque exerted by the Coriolis force Fc on the measuring disc, the mass flow rate of the material can be obtained. This design has the defects mentioned above. Specific Embodiment 3:
[0037] This embodiment further describes the No. 1 rotor scale 7 on the basis of Specific Embodiment 2. The No. 1 rotor scale 7 includes a No. 1 powder quantitative feeder 71 and a No. 1 powder flowmeter weigher 72 arranged in sequence from top to bottom. Specific Embodiment 4:
[0039] This embodiment further describes the kiln head coal powder silo 1 on the basis of Specific Embodiment 2. The discharge port diameter of the kiln head coal powder silo 1 is 750 mm.
[0040] The discharge port diameter of the original kiln head coal powder silo is changed from 500 mm to 750 mm, which can better complete the discharging. Specific Embodiment 5:
[0042] This embodiment further describes the feeding mechanism of the kiln tail combustion chamber on the basis of Specific Embodiment 1. The feeding mechanism of the kiln tail combustion chamber includes a kiln tail coal powder silo 2, a tail coal conveying pipeline 9, a No. 2 screw pump 10, and an air suspension fan 11. The tail coal conveying pipeline 9 is arranged below the kiln tail coal powder silo 2. A No. 2 rotor scale 12 is provided below the discharge end of the tail coal conveying pipeline 9. The discharge port of the No. 2 rotor scale 12 is connected to the feed port of a No. 2 air lock feeder 13. The No. 2 screw pump 10 is arranged below the discharge port of the No. 2 air lock feeder 13. The air suspension fan 3 is connected to the No. 2 screw pump 10.
[0043] The gap of the feeding device of the original tail scale feeder is relatively large, and the instantaneous feeding volume is greatly affected by the change of bin pressure. The phenomenon of "coal flow" often occurs, and the scale body swings greatly on site during coal flow, which poses potential equipment hazards. The original tail scale feeder is changed to a combination of a rotor scale and a lock hopper feeder. After commissioning after being put into operation, the air leakage at the feeding device is solved, the frequent jamming is affected, the number of times of stopping the material of the vertical mill is reduced, the power consumption of the raw material process and the oxygen content of the kiln tail waste gas are both reduced compared with before the transformation, and the operation effect is better. At the same time, the problem of large current fluctuation of the original tail scale feeder and large and small coal consumption is also solved, the coal consumption is further reduced, and the problem that when the calorific value of the raw coal is relatively low, the amount of tail coal used is large and the conveying capacity of the tail scale is insufficient, affecting the stable operation of the cement kiln is also improved. Specific Embodiment 6:
[0045] This embodiment further describes the second rotor scale 12 on the basis of Specific Embodiment 5. The second rotor scale 12 includes a second powder quantitative feeder 121 and a second powder flowmeter weighing machine 122 arranged in sequence from top to bottom. Specific Embodiment 7:
[0047] This embodiment further describes the kiln tail coal powder bin 2 on the basis of Specific Embodiment 5. The outlet diameter of the kiln tail coal powder bin 2 is 750 mm.
[0048] The outlet diameter of the original kiln tail coal powder bin is changed from 500 mm to 750 mm, so that the discharging can be better completed.
[0049] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.
Claims
1. A coal feeding system includes a coal feeding mechanism for the kiln head combustion chamber and a coal feeding mechanism for the kiln tail combustion chamber. The coal feeding mechanism for the kiln head combustion chamber is connected to the kiln head combustion chamber of the cement kiln, and the coal feeding mechanism for the kiln tail combustion chamber is connected to the burner of the kiln tail decomposition furnace of the cement kiln. Characterized in that: Stainless steel plates are installed on the inner walls of the conical parts of the kiln head coal powder silo (1) of the coal feeding mechanism for the kiln head combustion chamber and the inner walls of the conical parts of the kiln tail coal powder silo (2) of the coal feeding mechanism for the kiln tail combustion chamber. The air pressure providing structure of the coal feeding mechanism for the kiln tail combustion chamber is an air suspension fan (3), and a coal distributor with one inlet and three outlets is also installed on the conical platform of the decomposition furnace.
2. The coal feeding system according to claim 1, Characterized in that: The coal feeding mechanism for the kiln head combustion chamber includes a kiln head coal powder silo (1), a kiln head coal powder conveying pipe (4), a first screw pump (5) and a Roots blower (6). The kiln head coal powder conveying pipe (4) is arranged below the kiln head coal powder silo (1). A first rotor scale (7) is arranged below the discharge end of the kiln head coal powder conveying pipe (4). The discharge port of the first rotor scale (7) is connected to the feed port of a first air lock feeder (8). The first screw pump (5) is arranged below the discharge port of the first air lock feeder (8). The Roots blower (6) is connected to the first screw pump (5).
3. The coal feeding system according to claim 2, Characterized in that: The first rotor scale (7) includes a first powder quantitative feeder (71) and a first powder flowmeter weigher (72) arranged successively from top to bottom.
4. The coal feeding system according to claim 2, Characterized in that: The diameter of the discharge port of the kiln head coal powder silo (1) is 750 mm.
5. The coal feeding system according to claim 1, Characterized in that: The coal feeding mechanism for the kiln tail combustion chamber includes a kiln tail coal powder silo (2), a tail coal conveying pipeline (9), a second screw pump (10) and an air suspension fan (3). The tail coal conveying pipeline (9) is arranged below the kiln tail coal powder silo (2). A second rotor scale (12) is arranged below the discharge end of the tail coal conveying pipeline (9). The discharge port of the second rotor scale (12) is connected to the feed port of a second air lock feeder (13). The second screw pump (10) is arranged below the discharge port of the second air lock feeder (13). The air suspension fan (3) is connected to the second screw pump (10).
6. The coal feeding system according to claim 5, Characterized in that: The second rotor scale (12) includes a second powder quantitative feeder (121) and a second powder flowmeter weigher (122) arranged successively from top to bottom.
7. The coal feeding system according to claim 5, Characterized in that: The diameter of the discharge port of the kiln tail coal powder silo (2) is 750 mm.