Coal dust steady-flow conveying device
By setting up a steady flow unit in the inverted cone part of the coal pulverized bin and using a breathable layer in the steady flow chamber, the problem of fluctuations in the coal volume caused by the changes in the material level in the coal pulverized bin is solved, and the stable output of the coal pulverized bin is achieved and the rotary kiln is achieved. The calcination temperature stability in the interior reduces coal consumption and improves product quality.
Patent Information
- Application Number
- CN202421253940.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-04
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2034-06-04
AI Technical Summary
In the prior art, during the transportation process of coal powder from the coal powder bin to the rotor scale, the material pressure at the cutting outlet is unstable due to the change in the material level in the coal powder bin, causing the coal volume to fluctuate, affecting the stability of the calcination temperature in the rotary kiln. , which in turn affects product quality and increases coal consumption.
Design a coal powder flow stabilization conveying device, including a coal powder flow stabilization chamber, a rotor scale and a flow stabilization unit. The steady flow unit consists of a steady flow cone and a plurality of fixed rods, which are arranged inside the inverted cone part of the coal pulverized bin, and is used to buffer its pressure and kinetic energy during the falling of the coal pulverized pulverized pulverized pulverized pulverized pulverized pulverized pulverized pulverized pulverized pulverized pulverized pulverized pulverized pulverized pulverized pulverized At the same time, by setting up a breathable layer and exhaust duct, natural exhaust and filtration of the gas are achieved to ensure stable discharge of coal powder.
Through the buffering effect of the steady flow unit, the stable output of coal powder is achieved, the calcination temperature fluctuations in the rotary kiln are avoided, the thermal system is stabilized, coal consumption is reduced, and product quality is improved. The filtration effect of the breathable layer further ensures the cleanliness and safety of the equipment.
Smart Images
Figure CN222453768U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of coal powder transportation, and in particular to a coal powder steady-flow transportation device. Background Art
[0002] In the production process, pulverized coal is usually used as a heat source to heat the equipment that requires heat. In the rotary kiln calcining process, the coal used by the kiln head burner is measured by the rotor scale and then pneumatically transported to the kiln head burner.
[0003] In the prior art, during the transportation of pulverized coal from the pulverized coal bin to the rotor scale, the material level in the pulverized coal bin changes, and the pressure on the material at the discharge port is different, resulting in fluctuations in the discharge amount. The sudden collapse of pulverized coal hanging on the wall in the pulverized coal bin causes fluctuations in the coal discharge amount, resulting in unstable coal amount entering the rotary kiln burner, thereby causing fluctuations in the calcination temperature in the rotary kiln, making the thermal system unstable, causing a certain impact on the product quality in the kiln, and increasing coal consumption. Utility Model Content
[0004] The present application provides a coal powder steady flow conveying device to solve the above-mentioned problems mentioned in the background technology.
[0005] The present application provides a coal powder steady-flow conveying device, comprising: a coal powder bin, a steady-flow bin, a rotor scale and a steady-flow unit.
[0006] The pulverized coal bin comprises a columnar portion and an inverted cone portion which are connected up and down. The bottom of the inverted cone portion is connected with the top of the stabilizing bin, and the bottom outlet of the stabilizing bin is connected with the rotor.
[0007] The flow stabilizing unit is arranged inside the inverted cone part of the pulverized coal bin. The flow stabilizing unit includes a flow stabilizing cone and multiple fixed rods. The tip of the flow stabilizing cone is vertically toward the columnar part. The multiple fixed rods are circumferentially arranged on the outer side of the lower part of the flow stabilizing cone. One end of the multiple fixed rods away from the flow stabilizing cone is connected to the inner wall of the inverted cone part.
[0008] Optionally, an exhaust duct is connected to the top of the flow stabilization chamber.
[0009] Optionally, a breathable layer is provided on the exhaust pipe through a flange.
[0010] Optionally, the breathable layer is an antistatic coated breathable layer.
[0011] Optionally, the exhaust pipe is also connected to a back-blowing unit, which includes a high-pressure gas storage tank and a compressed gas pipeline. One end of the compressed gas pipeline is connected to the outlet of the high-pressure gas storage tank, and the other end of the compressed gas pipeline is detachably connected to the exhaust pipe. A solenoid valve is provided on the compressed gas pipeline.
[0012] Optionally, the ratio of the diameter of the bottom of the flow stabilizing cone to the diameter of the cross section of the inverted cone at the same height as the bottom of the flow stabilizing cone is 1:2-4.
[0013] Optionally, a vibrator is provided on the inner wall of the flow stabilizing cone.
[0014] Optionally, a discharge valve is provided at the bottom of the inverted cone.
[0015] The pulverized coal steady flow conveying device provided in the present application realizes the stable output of pulverized coal and has the following beneficial effects compared with the prior art:
[0016] (1) By setting a steady flow bin, the pulverized coal output from the pulverized coal bin is received, which plays a role in buffering the pulverized coal. By setting a steady flow unit inside the inverted cone of the pulverized coal bin, the pressure and kinetic energy of the pulverized coal are buffered during the pulverized coal falling process, so as to avoid the fluctuation of the pulverized coal caused by different pulverized coal levels, different kinetic energy during the falling process, or the collapse of the pulverized coal hanging on the wall in the pulverized coal bin, thereby avoiding the pulverized coal amount entering the steady flow bin from fluctuating, affecting the load rate of the rotor scale, and making the pulverized coal enter the rotor scale stably. The steady flow unit includes a steady flow cone and a plurality of fixed rods. The steady flow cone has a buffering effect on the kinetic energy of the pulverized coal during the falling process, and the kinetic energy of the pulverized coal decreases, so that the kinetic energy of the pulverized coal entering the steady flow bin remains slow and stable, and will not impact the pulverized coal in the discharge port and the steady flow bin, which is conducive to stabilizing the load rate of the rotor scale, stabilizing the coal feeding amount of the burner, and then stabilizing the thermal system in the rotary kiln (or other heating equipment, such as a boiler), while saving coal consumption, which has a good economic benefit for the enterprise.
[0017] (2) By setting up a breathable layer, not only can the gas in the stabilizing chamber be discharged in time and the air pressure balance in the stabilizing chamber be maintained, but the breathable layer also plays a filtering role, filtering the coal powder particles entrained in the gas discharged from the stabilizing chamber, thereby purifying the exhaust gas, which is beneficial to the cleanliness of the surrounding atmospheric environment and avoids the waste of coal powder.
[0018] (3) The present application adopts the natural exhaust method of pipelines, which cooperates with the flow stabilization unit to improve the stability of coal feeding, reduce the fluctuation range of the rotor load rate, and improve the stability of coal feeding of the burner, which is conducive to reducing coal consumption and stabilizing the production quality of the rotary kiln. At the same time, it reduces the use of equipment, saves energy and reduces consumption, and makes the device operation more convenient. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0020] Figure 1A schematic diagram of the structure of a coal powder steady flow conveying device provided in one embodiment of the present application;
[0021] Figure 2 A schematic diagram of the structure of a flow stabilization unit provided in one embodiment of the present application;
[0022] Figure 3 A schematic diagram of the structure of an exhaust duct provided in one embodiment of the present application;
[0023] Figure 4 A schematic structural diagram of a coal powder steady flow conveying device provided in another embodiment of the present application;
[0024] Description of reference numerals:
[0025] 1: pulverized coal bin, 2: flow stabilizing bin, 3: rotor scale, 110: columnar portion, 120: inverted cone portion, 121: unloading valve, 210: exhaust pipe, 220: flange, 230: air permeable layer, 241: high-pressure gas storage tank, 242: compressed gas pipeline, 243: solenoid valve, 410: flow stabilizing cone, 411: vibrator, 420: fixing rod. DETAILED DESCRIPTION
[0026] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application is clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work also fall within the scope of protection of the present application.
[0027] like Figure 1 and Figure 2 As shown, the present application provides a coal powder steady flow conveying device, comprising: a coal powder bin 1, a steady flow bin 2, a rotor scale 3 and a steady flow unit.
[0028] The pulverized coal bin 1 includes a columnar portion 110 and an inverted cone portion 120 connected up and down. The bottom of the inverted cone portion 120 is connected to the top of the stabilizing bin 2, and the bottom outlet of the stabilizing bin 2 is connected to the rotor scale 3.
[0029] The flow stabilizing unit is arranged inside the inverted cone portion 120 of the pulverized coal bin 1, and the flow stabilizing unit includes a flow stabilizing cone 410 and a plurality of fixed rods 420. The tip of the flow stabilizing cone 410 is vertically directed toward the columnar portion 110, and the plurality of fixed rods 420 are circumferentially arranged on the outer side of the lower part of the flow stabilizing cone 410. One end of the plurality of fixed rods 420 away from the flow stabilizing cone 410 is connected to the inner wall of the inverted cone portion 120.
[0030] Specifically, when using coal powder as fuel, the coal powder needs to be output from the coal powder bin 1 to the steady flow bin 2 for temporary storage, and then the coal powder in the steady flow bin 2 is fed to the rotor scale 3. The rotor scale 3 weighs the coal powder and quantitatively delivers it to the burner as fuel for combustion. In the process of transporting the coal powder from the coal powder bin 1 to the rotor scale 3, the stable delivery of the coal powder must be ensured to ensure that the burner can stably release the heat source and produce the product. The coal powder bin 1 is used to store the coal powder and output the coal powder as needed. The steady flow bin 2 is used to receive the coal powder output from the coal powder bin 1, play a role in buffering the coal powder, and at the same time deliver the coal powder to the rotor scale 3. The rotor scale 3 continuously weighs the coal powder from the steady flow bin 2 according to the required heat and delivers it to the subsequent burner for combustion.
[0031] The pulverized coal bin 1 includes a columnar portion 110 and an inverted cone portion 120 connected up and down. The design of the inverted cone portion 120 can facilitate the falling of pulverized coal, making it easier for the pulverized coal to fall into the steady flow bin 2. The steady flow unit is arranged inside the inverted cone portion 120 of the pulverized coal bin 1, and is used to buffer the pressure and kinetic energy of the pulverized coal during the falling process, thereby avoiding the fluctuation of the pulverized coal caused by different pulverized coal levels, different kinetic energy during the falling process, or the collapse of the pulverized coal hanging on the wall of the pulverized coal bin 1, thereby avoiding the amount of pulverized coal entering the steady flow bin 2 from fluctuating, affecting the load rate of the rotor scale 3, and allowing the pulverized coal to enter the rotor scale 3 stably.
[0032] The flow stabilizing unit includes a flow stabilizing cone 410 and a plurality of fixing rods 420. The tip of the flow stabilizing cone 410 is vertically directed toward the columnar portion 110. When the pulverized coal falls from the pulverized coal bin 1, it collides with the outer wall of the flow stabilizing cone 410. During the collision, the flow stabilizing cone 410 has a buffering effect on the kinetic energy of the pulverized coal in the falling process. The kinetic energy of the pulverized coal decreases, and part of the pulverized coal falls along the outer wall of the flow stabilizing cone 410, so that the kinetic energy of the pulverized coal entering the pulverized coal bin 2 remains slow, and the pulverized coal in the discharge port and the pulverized coal in the pulverized coal bin 2 will not be impacted due to different pulverized coal levels or the collapse of pulverized coal hanging on the wall, which is beneficial to stabilizing the load rate of the rotor scale 3, stabilizing the coal feeding amount of the burner, and then stabilizing the thermal system in the rotary kiln (or other heating equipment, such as a boiler), while saving coal consumption, which has good economic benefits for the enterprise.
[0033] At the same time, the tip of the flow stabilizing cone 410 can disperse the agglomerated coal powder during the falling process of the coal powder, prevent the coal powder from clumping and bridging, and help to transport the coal powder more smoothly and stably.
[0034] The flow stabilizing cone 410 is coaxially arranged with the columnar portion 110 and the inverted cone portion 120, which is beneficial to the structural stability of the coal powder bin 1. A plurality of fixing rods 420 are used to fix the flow stabilizing cone 410 inside the inverted cone portion 120, thereby improving the stability of the flow stabilizing cone 410, thereby enabling the coal powder steady flow conveying device to operate stably for a long time.
[0035] The present application realizes the stable output of coal powder through the above scheme. By setting up a steady flow bin to receive the coal powder output from the coal powder bin, it plays a role in buffering the coal powder. By setting up a steady flow unit inside the inverted cone of the coal powder bin, it is used to buffer the pressure and kinetic energy of the coal powder during the falling process of the coal powder, so as to avoid the fluctuation of coal powder caused by different coal powder levels, different kinetic energy during the falling process, or the collapse of coal powder hanging on the wall in the coal powder bin, thereby avoiding the fluctuation of coal powder entering the steady flow bin, affecting the load rate of the rotor scale, and making the coal powder stably enter the rotor scale. The flow stabilizing unit includes a flow stabilizing cone and multiple fixed rods. The flow stabilizing cone has a buffering effect on the kinetic energy of the coal powder in the process of falling. The kinetic energy of the coal powder decreases, so that the kinetic energy of the coal powder entering the stabilizing bin remains slow and stable, and will not have an impact on the discharge port and the coal powder in the stabilizing bin. It is beneficial to stabilize the load rate of the rotor scale, stabilize the coal feeding amount of the burner, and then stabilize the thermal system in the rotary kiln (or other heating equipment, such as a boiler), while saving coal consumption, which has good economic benefits for the enterprise.
[0036] like Figure 3 As shown, optionally, an exhaust pipe 210 is connected to the top of the stabilizing chamber 2.
[0037] Specifically, the exhaust pipe 210 is used to discharge the gas in the stabilizing chamber 2 , and the exhaust pipe 210 is connected to the atmosphere to stabilize the air pressure in the stabilizing chamber 2 , thereby ensuring the stable discharge of the coal powder in the stabilizing chamber 2 .
[0038] like Figure 3 As shown, optionally, a breathable layer 230 is provided on the exhaust pipe 210 through the flange 220 .
[0039] Specifically, the air permeable layer 230 not only ensures that the gas in the stabilizing chamber 2 is discharged in time and maintains the air pressure balance in the stabilizing chamber 2, but also plays a filtering role, filtering the coal powder particles entrained in the gas discharged from the stabilizing chamber 2, thereby purifying the discharged gas, which is beneficial to the cleanliness of the surrounding atmospheric environment and avoids the waste of coal powder.
[0040] In the prior art, the exhaust method in the steady flow bin 2 is to connect and use the negative pressure suction of the dust collector to extract the gas in the steady flow bin 2. This setting has certain disadvantages, such as the frequency of the dust collector is difficult to control. When the frequency is low, the pressure balance in the steady flow bin 2 cannot be achieved. When the frequency is too high, the steady flow bin 2 is in a negative pressure state, which affects the falling stability of the coal powder in the steady flow bin 2. At the same time, the coal powder in the steady flow bin 2 is easily extracted, which increases the load of dust removal and causes waste of coal powder. In addition, coal is easily agglomerated in the pipeline, which is inconvenient to clean, and ventilation is affected, which poses a safety hazard of spontaneous combustion of coal powder. In this application, a breathable layer 230 is set, and no other negative pressure device is set to exhaust the steady flow bin 2. The natural exhaust method of the pipeline is used to cooperate with the steady flow unit to improve the stability of coal lowering, reduce the fluctuation range of the rotor load rate 3, and improve the stability of the burner coal feeding, which is conducive to reducing coal consumption and stabilizing the output and quality of the rotary kiln. At the same time, the use of equipment is reduced, energy saving and consumption reduction are reduced, and the operation of the device is made more convenient.
[0041] Optionally, the breathable layer 230 is an antistatic film breathable layer.
[0042] Specifically, the provision of an anti-static coated breathable layer avoids static electricity generated by friction between air, entrained coal powder and the pipe wall during the exhaust process of the steady flow bin 2, thereby posing a safety hazard of spontaneous combustion of coal powder, thereby improving the safety and stability of coal powder transportation.
[0043] like Figure 4 As shown, optionally, the exhaust pipe 210 is also connected to a back-blowing unit, which includes a high-pressure gas storage tank 241 and a compressed gas pipeline 242. One end of the compressed gas pipeline 242 is connected to the outlet of the high-pressure gas storage tank 241, and the other end of the compressed gas pipeline 242 is detachably connected to the exhaust pipe 210. A solenoid valve 243 is provided on the compressed gas pipeline 242.
[0044] Specifically, the back-blowing unit is used to back-blow the air-permeable layer 230 , blow away the coal powder and other particulate matter attached to the air-permeable layer 230 , and restore the filtering function of the air-permeable layer 230 .
[0045] The high-pressure gas storage tank 241 is used to provide high-pressure gas, and the compressed gas pipeline 242 is used to transport the high-pressure gas from the high-pressure gas storage tank 241 to the exhaust pipe 210 to backflush the air permeable layer 230. The high-pressure gas is released, closed or adjusted by opening and closing the electromagnetic valve 243. The backflush unit is opened and closed regularly to backflush the air permeable layer 230 regularly to ensure the filtering effect of the air permeable layer 230. The compressed gas is air or an inert gas, such as nitrogen.
[0046] Furthermore, by arranging pressure gauges on both sides of the air permeable layer 230 inside the exhaust pipe 210, it is determined whether the air permeable layer 230 needs backblowing by observing the pressure difference between the two pressure gauges.
[0047] Optionally, the ratio of the bottom diameter of the flow stabilizing cone 410 to the diameter of the cross section of the inverted cone 120 at the same height as the bottom of the flow stabilizing cone 410 is 1:2-4.
[0048] Specifically, such a configuration not only enables the flow stabilizing cone 410 to stabilize the falling coal powder, but also prevents the passage of the falling coal powder from being blocked, thereby affecting the falling of the coal powder.
[0049] like Figure 4 As shown, optionally, a vibrator 411 is provided on the inner wall of the flow stabilizing cone 410 .
[0050] Specifically, during the coal powder conveying process, the vibrator 411 is turned on at a fixed time to make the side wall of the flow stabilizing cone 410 vibrate, thereby driving the coal powder to fall, thereby preventing the coal powder from clumping in the coal powder bin 1 .
[0051] Optionally, a discharge valve 121 is provided at the bottom of the inverted cone 120 .
[0052] Specifically, by adjusting the opening of the discharge valve 121, the amount of pulverized coal entering the stabilizing bin 2 is adjusted, which promotes the stable transportation of the pulverized coal.
[0053] The technical solution of the present application is described in detail below with reference to specific embodiments.
[0054] The operation flow of the coal powder steady flow conveying device in this embodiment is as follows:
[0055] During the process of conveying pulverized coal from the pulverized coal bin 1 to the rotor scale 3, first, the unloading valve 121 and the rotor scale 3 are opened. The pulverized coal in the pulverized coal bin 1 falls under the action of gravity. During the process of falling in the pulverized coal bin 1, the pulverized coal collides with the outer wall of the flow stabilizing cone 410. During the collision, the flow stabilizing cone 410 has a buffering effect on the kinetic energy of the pulverized coal in the process of falling, and the kinetic energy of the pulverized coal decreases. Part of the pulverized coal falls against the outer wall of the flow stabilizing cone 410, so that the kinetic energy of the pulverized coal entering the flow stabilizing bin 2 remains slow. The flow stabilizing bin 2 receives the pulverized coal output from the pulverized coal bin 1, temporarily stores the pulverized coal, and conveys the pulverized coal to the rotor scale 3. The rotor scale 3 continuously weighs the pulverized coal from the flow stabilizing bin 2 according to the required heat and conveys it to the subsequent burner for combustion. This is conducive to stabilizing the load rate of the rotor scale 3 and stabilizing the coal feeding amount of the burner. At the same time, the tip of the flow stabilizing cone 410 can disperse the agglomerated pulverized coal during the pulverized coal falling process to ensure smooth and stable pulverized coal conveying.
[0056] When the pulverized coal in the pulverized coal bin 1 falls into the stabilizing bin 2, the gas volume in the stabilizing bin 2 changes, and thus the pressure in the stabilizing bin 2 changes, and the gas in the stabilizing bin 2 needs to be discharged to stabilize the gas pressure in the stabilizing bin 2. The exhaust pipe 210 is connected to the atmosphere, and the pulverized coal particles carried in the gas discharged from the stabilizing bin 2 are filtered through the air permeable layer 230 and then discharged from the exhaust pipe 210, thereby ensuring the stable discharge of the pulverized coal in the stabilizing bin 2.
[0057] During the coal powder transportation process, the air permeable layer 230 is back-blown periodically to ensure the filtering effect of the air permeable layer 230. The back-blowing amount of the high-pressure gas is adjusted by adjusting the opening of the electromagnetic valve 243. The compressed gas back-blown the air permeable layer 230 through the compressed gas pipeline 242. The compressed gas is air.
[0058] During the coal powder conveying process, the vibrator 411 is turned on at a fixed time to prevent the coal powder from clumping in the coal powder bin 1 .
[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.
Claims
1. A coal powder steady flow conveying device, characterized in that: include: A pulverized coal bin (1), a flow stabilizing bin (2), a rotor scale (3) and a flow stabilizing unit; The pulverized coal bin (1) comprises a columnar portion (110) and an inverted cone portion (120) which are connected to each other from top to bottom, the bottom of the inverted cone portion (120) is connected to the top of the stabilizing bin (2), and the bottom outlet of the stabilizing bin (2) is connected to the rotor scale (3); The flow stabilizing unit is arranged inside the inverted cone portion (120) of the pulverized coal bin (1), and comprises a flow stabilizing cone (410) and a plurality of fixing rods (420), the tip of the flow stabilizing cone (410) is vertically directed toward the columnar portion (110), the plurality of fixing rods (420) are circumferentially arranged on the outer side of the lower portion of the flow stabilizing cone (410), and one end of the plurality of fixing rods (420) away from the flow stabilizing cone (410) is connected to the inner wall of the inverted cone portion (120).
2. The coal powder steady flow conveying device according to claim 1, characterized in that: The top of the flow stabilizing chamber (2) is connected to an exhaust pipe (210).
3. The coal powder steady flow conveying device according to claim 2, characterized in that: A breathable layer (230) is provided on the exhaust pipe (210) via a flange (220).
4. The coal powder steady flow conveying device according to claim 3, characterized in that: The air permeable layer (230) is an antistatic film-coated air permeable layer.
5. The coal powder steady flow conveying device according to claim 4, characterized in that: The exhaust pipe (210) is also connected to a back-blowing unit, which includes a high-pressure gas storage tank (241) and a compressed gas pipeline (242). One end of the compressed gas pipeline (242) is connected to the outlet of the high-pressure gas storage tank (241), and the other end of the compressed gas pipeline (242) is detachably connected to the exhaust pipe (210). A solenoid valve (243) is provided on the compressed gas pipeline (242).
6. The coal powder steady flow conveying device according to any one of claims 1 to 5, characterized in that: The ratio of the bottom diameter of the flow stabilizing cone (410) to the diameter of the cross section of the inverted cone (120) at the same height as the bottom of the flow stabilizing cone (410) is 1:2-4.
7. The coal powder steady flow conveying device according to claim 6, characterized in that: A vibrator (411) is provided on the inner wall of the cone of the flow stabilizing cone (410).
8. The coal powder steady flow conveying device according to claim 7, characterized in that: A material discharge valve (121) is provided at the bottom of the inverted cone portion (120).