System and process for improving combustion efficiency of petroleum coke powder through rice husks

Abstract

The invention discloses a system for improving combustion efficiency of petroleum coke powder through chaff, which comprises a chaff processing mechanism, a fuel supply mechanism, a fuel conveying mechanism and a fuel mixing mechanism, the chaff processing mechanism and the fuel supply mechanism are both connected with the fuel mixing mechanism, the bottom of the fuel mixing mechanism is in butt joint with the fuel conveying mechanism, and the fuel mixing mechanism is in butt joint with the fuel conveying mechanism. The tail end of the fuel conveying mechanism communicates with the combustion mechanism, and the fuel mixing mechanism conveys mixed fuel to the combustion mechanism for combustion. Biomass chaff mixed petroleum coke powder can be conveniently added into the kiln for combustion, so that the petroleum coke powder can be rapidly ignited, the defect that the petroleum coke powder is slow in temperature rise is overcome, the temperature is convenient to control, and meanwhile the yield and quality are stable.

Description

Technical Field

[0001] The present invention relates to the field of fuel placement equipment for cement processing, and particularly to a system and process for improving the combustion efficiency of petroleum coke powder by using rice husks. Background Art

[0002] With the increasing social demand for energy, the rapidly decreasing of petrochemical fuels as the main energy source, the development and utilization of sustainable alternative energy has become a new major issue. As an energy-intensive industry, cement production is particularly urgent to find alternative fuels. Biomass resources, as relatively stable renewable energy, can partially replace the traditional energy in cement production, realizing energy conservation and consumption reduction in cement plants, and reducing the environmental and resource load.

[0003] Currently, the company's white cement production line uses petroleum coke as fuel. Petroleum coke has the characteristic of low volatile content (10%). Coupled with the fact that the clinker is mainly cooled by water and the secondary air temperature entering the kiln is only about 800°C, it is impossible to quickly ignite the petroleum coke powder. As a result, the black fire head of the flame in the kiln is relatively long and the firepower is not concentrated, resulting in poor control of the temperature in the kiln, that is, the temperature in the kiln fluctuates greatly, affecting the production quality. Summary of the Invention

[0004] Aiming at the deficiencies of the above-mentioned prior art, the present invention discloses a system for improving the combustion efficiency of petroleum coke powder by using rice husks, which is convenient to realize mixing biomass rice husks with petroleum coke powder and adding them into the kiln for combustion, so as to quickly ignite the petroleum coke powder, facilitate temperature control, and at the same time, the production quality is stable. At the same time, the comprehensive energy consumption per unit output value is reduced by 13.5%, reaching the first-level energy consumption standard, the carbon dioxide emission is reduced by 18% compared with 2020, and the proportion of non-fossil energy consumption reaches about 15%, promoting the company's comprehensive green transformation and sustainable development.

[0005] To achieve the above object, the solution of the present invention is: A system for improving the combustion efficiency of petroleum coke powder by using rice husks, including a rice husk processing mechanism, a fuel supply mechanism, a fuel conveying mechanism and a fuel mixing mechanism. The rice husk processing mechanism and the fuel supply mechanism are both connected to the fuel mixing mechanism. The bottom of the fuel mixing mechanism is connected to the fuel conveying mechanism, and the end of the fuel conveying mechanism is communicated with the combustion mechanism. The fuel mixing mechanism conveys the mixed fuel to the combustion mechanism for combustion; The husk processing mechanism includes a husk storage bin, a coarse husk powder assembly, a fine husk powder assembly, and a fine powder bin. The husk inside the husk storage bin is conveyed to the coarse powder in the coarse husk powder assembly through a belt. Similarly, the husk in the coarse husk powder assembly is conveyed to the fine powder assembly through a screw conveyor for fine powder processing. The fine husk powder assembly is connected to a material distribution box through a pipeline. There are three fine powder bins arranged below the material distribution box. A gate valve is provided at the bottom of each fine powder bin. A first feeding screw auger is provided below each fine powder bin. The end of the first feeding screw auger is butted against a second feeding screw auger. The first feeding screw auger and the second feeding screw auger are connected and communicated with each other. Two of the buffer bins are butted against the fuel supply mechanism. The end of the second feeding screw auger is butted against the buffer bin. In this way, the husk and fuel are conveyed into the buffer bin for mixing and then conveyed backward. The fuel conveying mechanism includes an ignited husk pipeline, a raw coal conveying pipeline, and a tail coal conveying pipeline. The fuel in the buffer bin directly enters the raw coal conveying pipeline and the tail coal conveying pipeline. Fuel mixing mechanisms are installed in the buffer bins connected to the raw coal conveying pipeline and the tail coal conveying pipeline respectively. A discharge pipe is butted at the bottom of each buffer bin. The ignited husk pipeline, the raw coal conveying pipeline, and the tail coal conveying pipeline are respectively communicated with the corresponding discharge pipes. The ignited husk pipeline only conveys husk. The fuel and husk are conveyed to the combustion mechanism through the ignited husk pipeline, the raw coal conveying pipeline, and the tail coal conveying pipeline.

[0006] Preferably, a small-range metering device is added to the second feeding screw auger to realize DCS regulation of the added amount of husk powder and accurately add it.

[0007] Preferably, in order to reduce the metering accuracy caused by the increased weight of the rotor scale due to the addition of equipment such as augers, soft connections are adopted between the first feeding screw auger and the second feeding screw auger, and between the second feeding screw auger and the buffer bin.

[0008] Preferably, the fuel supply mechanism is a coke powder screw auger connected to the bottom communication pipe of the petroleum coke powder storage. A coke powder rotor scale is butted against the coke powder screw auger. The bottom of the coke powder rotor scale is communicated with the top of the buffer bin to quantitatively convey coke powder into the buffer bin.

[0009] Preferably, anti-blocking components are provided in both the husk storage bin and the fine powder bin. The anti-blocking components are compressed air spray pipes. The husk storage bin and the fine powder bin are both installed with vertically arranged compressed air spray pipes. Multiple groups of nozzles are installed on the compressed air spray pipes at equal intervals up and down. The nozzles are arranged obliquely upward and are communicated with the compressed air spray pipes. The nozzles are butted against the compressed air spray pipes through hollow pipes. A blocking block is installed on the compressed air spray pipe. An air pump is installed at the top of the compressed air spray pipe. The bottom of the compressed air spray pipe is closed. A lead screw driven by a motor is installed in the compressed air spray pipe. The lead screw passes through the blocking block. The inner cross-section of the compressed air spray pipe is polygonal. The lifting of the blocking block is realized through the lead screw.

[0010] Preferably, a fuel mixing mechanism is arranged in each buffer bin. The fuel mixing mechanism includes a rotating body, a temporary storage cylinder and stirring blades. A separating funnel is installed in the buffer bin. The buffer bin is divided into upper and lower layers by the separating funnel. The upper layer of the buffer bin is communicated with the second feeding screw reamer and the coke powder rotor weigher. The lower layer of the buffer bin is a horizontal circular cavity. A horizontal rotating body that fits the inner wall is embedded in the circular cavity. The rotating body is driven by a motor. A plurality of temporary storage cylinders distributed in an annular array are installed on the rotating body. One side of the temporary storage cylinder is docked with the bottom of the separating funnel through the rotation of the rotating body. A rotating shaft is installed in each temporary storage cylinder, and stirring blades are installed on the rotating shaft. The rotating body is a hollow ring in the middle. The rotating shaft passes through the rotating body and extends into the ring of the rotating body. A first bevel gear is installed on the rotating shaft. A second bevel gear extending into the ring is installed in the buffer bin. The first bevel gear on the rotating shaft meshes with the second bevel gear in the buffer bin, and the rotation of the rotating shaft is realized through the rotation of the rotating body; a discharge pipe is docked at the bottom of the buffer bin. A screw conveyor driven by a motor is installed in the discharge pipe. One end of the discharge pipe is docked with the corresponding raw coal conveying pipeline, tail coal conveying pipeline and igniting rice husk pipeline.

[0011] Preferably, a pushing component is installed in the hollow part of the rotating body. The pushing component is installed on the inner wall of the buffer bin and extends into the rotating body. A hemisphere extending inward is installed on the inner wall of the first bevel gear. The pushing component is a conical rod driven by a cylinder. The hemisphere contacts the outer wall of the conical rod. A return spring is sleeved in the rotating shaft. Both ends of the return spring abut against the first bevel gear and the temporary storage cylinder. The sliding of the rotating shaft is realized through the return spring; a supporting plate that fits the inner wall of the temporary storage cylinder is installed in the temporary storage cylinder. The supporting plate fits the bottom of the temporary storage cylinder. The supporting plate and the rotating shaft are connected by a bearing, and discharging is realized through the lifting of the supporting plate.

[0012] A process for adding rice husk to fuel; 1. The rice husk is crushed to less than 0.65 mm by a coarse powder machine and a fine powder machine. The crushed rice husk is respectively loaded into three fine powder bins provided with weighing sensors for storage; 2. The rice husk in the three fine powder bins is conveyed to the second feeding screw reamer by the first feeding screw reamer. The second feeding screw reamer conveys a fixed amount of rice husk into the buffer bin. The corresponding petroleum coke powder is conveyed to the coke powder rotor weigher by the coke powder screw reamer. The petroleum coke powder is metered by the coke powder rotor weigher. Two transfer bins are communicated with the coke powder rotor weigher. The petroleum coke powder in the rotor weigher is quantitatively conveyed into the buffer bin. The quantitative ratio of rice husk and petroleum coke powder is realized through the second feeding screw auger and the rotor weigher. The rice husk and petroleum coke powder entering the buffer bin are mixed; III. The petroleum coke powder and rice husk in two of the buffer bins are mixed and then conveyed into the rotary kiln and the decomposition furnace respectively by pneumatic conveyors, so as to realize the addition of rice husk into the head coal and the tail coal. The pure rice husk in the other buffer bin is conveyed by pneumatic force in the rice husk ignition pipeline, and the pure rice husk is used as an ignition aid to replace the previous fuel oil to ignite the petroleum coke powder at the kiln head; IV. Ignite the pure rice husk in the rice husk ignition pipeline. Due to the combustion characteristics of rice husk, the rapid temperature rise of the rotary furnace can be realized. Thus, the temperature in the rotary furnace rises quickly. After the temperature in the rotary furnace rises, the mixture of rice husk and petroleum coke coal ejected from the burner can be quickly ignited. The high-temperature gas moves backward to the decomposition furnace. Similarly, the mixture of rice husk and petroleum coke coal ejected from the kiln tail can also be quickly ignited. By adding rice husk to the petroleum coke powder, the difficulty in igniting the petroleum coke coal and the slow temperature rise are compensated. At the same time, the petroleum coke powder compensates for the disadvantages of low calorific value and high price of rice husk.

[0013] Compared with the prior art, the advantages of the present invention are as follows: it is convenient to realize the combustion of the mixture of biomass rice husk and petroleum coke powder added into the kiln, so that the petroleum coke powder can be quickly ignited, and at the same time, the drawback of slow temperature rise of the petroleum coke powder is compensated, so that the temperature is easy to control, and the product quality is stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic diagram of the present invention.

[0015] Figure 2 is a top view of the buffer bin of the present invention.

[0016] Figure 3 is a transverse sectional view of the buffer bin of the present invention.

[0017] Figure 4 is a schematic plan sectional view of the buffer bin of the present invention.

[0018] Figure 5 is a sectional view of the rice husk storage box of the present invention. Figure 6 is a schematic diagram of the anti-blocking component of the present invention.

[0019] Among them: 1. Rice husk processing mechanism, 2. Rice husk storage box, 3. Coarse rice husk powder component, 4. Fine rice husk powder component, 5. Fine powder bin, 6. Feeding box, 7. Gate valve, 8. First feeding screw auger, 9. Second feeding screw auger, 10. Small-range metering device, 11. Hose, 12. Buffer bin, 13. Fuel supply mechanism, 14. Coke powder screw auger, 15. Coke powder rotor weigher, 16. Fuel conveying mechanism, 17. Ignited rice husk pipeline, 18. Head coal conveying pipeline, 19. Tail coal conveying pipeline, 20. Fuel mixing mechanism, 21. Rotating body, 22. Temporary storage cylinder, 23. Stirring blade, 24. Partition funnel, 25. Circular cavity, 26. Rotating shaft, 27. First helical gear, 28. Second helical gear, 29. Discharge pipe, 30. Pushing component, 31. Hemisphere, 32. Return spring, 33. Support plate, 34. Anti-blocking component, 35. Compressed air blowing pipe, 36. Sprinkler head, 37. Air pump, 38. Lead screw, 39. Plug block. Detailed implementation mode

[0020] Now, in combination with the attached drawings, the present invention will be further elaborated: As Figures 1-5 shown, a system for improving the combustion efficiency of petroleum coke powder by rice husk includes a rice husk processing mechanism 1, a fuel supply mechanism 13, a fuel conveying mechanism 16 and a fuel mixing mechanism 20. Among them, the rice husk processing mechanism 1 and the fuel supply mechanism 13 are both connected to the fuel mixing mechanism 20. The bottom of the fuel mixing mechanism 20 is connected to the fuel conveying mechanism 16. The petroleum coke powder and the rice husk powder are conveyed into the fuel mixing mechanism 20 through the fuel conveying mechanism 16 for mixing. The end of the fuel conveying mechanism 16 is connected to the combustion mechanism, and the fuel mixing mechanism 20 conveys the mixed fuel to the combustion mechanism for combustion; The husk processing mechanism 1 includes a husk storage bin 2, a coarse husk powder assembly 3, a fine husk powder assembly 4 and a fine powder bin 5. The coarse husk powder assembly 3 and the fine husk powder assembly 4 are both husk crushers. The coarse husk powder assembly 3 and the fine husk powder assembly 4 only differ in blades. In this way, the coarse husk powder assembly 3 and the fine husk powder assembly 4 first coarsely powder and then finely powder the husk. A rectangular channel is installed at the bottom of the husk storage bin 2, and a belt driven by a motor is installed in the rectangular channel. The husk in the husk storage bin 2 falls onto the belt, and the belt conveys the husk into the coarse husk powder assembly 3 for coarse powdering. A screw conveyor assembly is installed at the bottom of the coarse husk powder assembly 3 through a flange. In this way, the husk in the coarse husk powder assembly 3 is conveyed into the fine husk powder assembly 4 through the screw conveyor assembly for fine powdering. The fine husk powder assembly 4 is connected to a material distribution box 6 through a pipeline. The two ends of the pipeline are respectively butted and communicated with the bottom of the fine husk powder assembly 4 and the top of the material distribution box 6 through flanges. In this way, the finely powdered husk in the fine husk powder assembly 4 is conveyed into the material distribution box 6. Three fine powder bins 5 are butted below the material distribution box 6 through flanges, and the three fine powder bins 5 are equally spaced. In this way, the material distribution box 6 supplies husk to the three fine powder bins 5 in sequence. A gate valve 7 is provided at the bottom of each fine powder bin 5 through a flange. The discharging and stopping of the fine powder bin 5 are realized by opening and closing the gate valve 7. A first feeding screw auger 8 is provided below each fine powder bin 5, that is, one end of the first feeding screw auger 8 is fixed to the bottom of the gate valve 7 by means of bolt fastening. When the gate valve 7 is opened, the powder in the fine powder bin 5 enters the first feeding screw auger 8. The end of the first feeding screw auger 8 is butted against a second feeding screw auger 9 (that is, below the first feeding auger 8, the first feeding screw auger 8 and the second feeding screw auger 9 are butted through a connecting pipe). The first feeding screw auger 8 and the second feeding screw auger 9 are connected and communicated. Two of the buffer bins 12 are butted against the fuel supply mechanism 13, that is, the fuel supply mechanism 13 conveys petroleum coke powder into the two buffer bins 12 through a belt. The end of the second feeding screw auger 9 is butted against the buffer bin 12, and the second feeding screw auger 9 conveys the finely powdered husk into the buffer bin 12. There are three buffer bins 12 in total. In this way, petroleum coke powder and husk are simultaneously introduced into two of the buffer bins 12. In this way, the petroleum coke powder and the husk are mixed and used as the head coal and tail coal of the previous combustion mechanism of the combustion mechanism. There is also one buffer bin 12 into which only husk is introduced. The husk in this buffer bin 12 is directly introduced into the combustion mechanism as an ignition material for ignition. In this way, the temperature in the combustion mechanism is increased, which is convenient for the head coal and tail coal to burn quickly when entering the burner. The burner is a rotary kiln and a decomposition furnace. The head coal enters the rotary kiln, and the tail coal enters the decomposition furnace; The fuel delivery mechanism 16 includes a rice husk ignition pipeline 17, a raw coal delivery pipeline 18 and a tail coal delivery pipeline 19. The fuel in the buffer bin 12 directly enters the raw coal delivery pipeline 18 and the tail coal delivery pipeline 19. Fuel mixing mechanisms 20 are installed in the buffer bin 12 connected to the raw coal delivery pipeline 18 and the tail coal delivery pipeline 19. When there is petroleum coke powder and rice husk powder in the buffer bin 12, the petroleum coke powder and rice husk in the buffer bin 12 are evenly mixed. A discharge pipe 29 is butt-connected to the bottom of each buffer bin 12 through a flange. The materials in the buffer bin 12 are discharged from the buffer bin 12 through the discharge pipe 29. The rice husk ignition pipeline 17, the raw coal delivery pipeline 18 and the tail coal delivery pipeline 19 are respectively communicated with the corresponding discharge pipes 29. The rice husk ignition pipeline 17 only conveys rice husks, and the raw coal delivery pipeline 18 and the tail coal delivery pipeline 19 convey the mixture of petroleum coke powder and rice husk to the combustion mechanism. In this way, the rice husk ignition pipeline 17 provides an ignition source for the combustion mechanism to ensure rapid heating in the burner, and the raw coal delivery pipeline 18 and the tail coal delivery pipeline 19 convey raw coal and tail coal to the combustion mechanism.

[0021] A small-range metering device 10 is added to the second feeding screw auger 9 to realize DCS regulation of the added amount of rice husk powder for accurate addition. The small-range metering device 10 of the second feeding screw auger 9 is a screw scale. It measures while conveying through the screw scale. The motor driving the screw scale is connected to a frequency converter, and the frequency converter is connected to the output end of the PLC controller. The integrated high-precision weight sensor on the screw scale is connected to the input end of the PLC controller. In this way, DCS regulation of the screw scale is realized, that is, the weight of the screw scale is fed back to the PLC controller, and the PLC controls the rotation speed of the screw scale and adjusts the conveying amount of the screw scale.

[0022] To reduce the metering accuracy affected by the increased weight of the rotor scale due to adding equipment such as augers, flexible connections are adopted between the first feeding screw auger 8 and the second feeding screw auger 9, and between the second feeding screw auger 9 and the buffer bin 12. The flexible connection is a bellows. The first feeding screw auger 8 and the second feeding screw auger 9 are connected and communicated through the bellows. The two ends of the bellows are respectively fixed on the first feeding screw auger 8 and the second feeding screw auger 9 through bolts. The second feeding screw auger 9 and the buffer bin 12 are connected and communicated through the bellows. The two ends of the bellows are respectively fixed on the second feeding screw auger 9 and the buffer bin 12 through bolts. In this way, when the second feeding auger is communicated with the first feeding auger and the buffer bin 12, the weight of the second feeding auger will not be affected by the self-weights of the first feeding auger and the buffer bin 12, thus ensuring the stability of the materials in the buffer bin 12.

[0023] The fuel supply mechanism 13 is the coke powder spiral reamer 14 connected to the bottom of the petroleum coke powder storage. At the end of the coke powder spiral reamer 14, a coke powder rotor weigher 15 is connected by a flange. The bottom of the coke powder rotor weigher 15 is connected to the top of the buffer bin 12 to quantitatively convey coke powder into the buffer bin 12, so as to supply petroleum coke powder to the buffer bin 12 through the coke powder rotor weigher 15.

[0024] Anti-blocking components 34 are arranged in both the husk storage box 2 and the fine powder bin 5. The anti-blocking component 34 is a compressed air blowing pipe 35. The compressed air blowing pipe 35 is vertically inserted into both the husk storage box 2 and the fine powder bin 5. A plurality of groups of nozzles 36 are installed on the compressed air blowing pipe at equal intervals up and down by welding. The nozzles 36 are arranged obliquely upward. When the husk storage box 2 and the fine powder bin 5 are blocked, the nozzles 36 spray high-pressure gas obliquely upward to break up the blocked lumps. The nozzles 36 are connected to the compressed air blowing pipe 35. The nozzles 36 are connected to the compressed air blowing pipe 35 through a hollow pipe. A movable plug 39 is installed in the compressed air blowing pipe 35 up and down. The top of the compressed air blowing pipe 35 is connected to an air pump 37 through a pipeline. High-pressure gas is introduced into the compressed air blowing pipe 35 through the air pump 37. The bottom of the compressed air blowing pipe 35 is closed. A lead screw 38 driven by a motor is inserted into the compressed air blowing pipe. The lead screw 38 passes through the plug 39. The inner cross-section of the compressed air blowing pipe is polygonal. The lifting of the plug 39 is realized through the lead screw 38. The spraying of high-pressure gas by specific nozzles 36 is realized through the lifting of the plug. The plurality of nozzles 36 above the nozzle 36 are squeezed by the husk. In this way, only the nozzles below the blocked part are not squeezed by the husk. In this way, the nozzles spray high-pressure gas to break up the caked husk, so as to prevent the husk from blocking.

[0025] A fuel mixing mechanism 20 is arranged in each buffer bin 12. The fuel mixing mechanism 20 includes a rotating body 21, a temporary storage cylinder 22 and stirring blades 23. A separating funnel 24 is installed on the inner wall of the buffer bin 12 by means of bolt fastening. The buffer bin 12 is divided into upper and lower layers by the separating funnel 24. The fuel in the upper layer can fall to the lower layer of the buffer bin 12 through the separating funnel 24. The upper layer of the buffer bin 12 is communicated with the second feeding screw reamer 9 and the coke powder rotor weigher 15. The lower layer of the buffer bin 12 is a circular cavity 25. A horizontal rotating body 21 that fits the inner wall is embedded in the circular cavity 25. The rotating body 21 is driven by a motor. A plurality of temporarily storage cylinders 22 distributed in an annular array are installed on the rotating body 21 by means of bolt fastening. The temporarily storage cylinder 22 realizes docking with the bottom of the separating funnel 24 on one side through the rotation of the rotating body 21. The material in the separating funnel 24 enters the temporarily storage cylinder 22 for relaxation. A rotating shaft 26 is installed in each temporarily storage cylinder 22 through a bearing. Stirring blades 23 are installed on the rotating shaft 26 by welding. The rotating body 21 is a hollow ring in the middle. The rotating shaft 26 passes through the rotating body 21 and extends into the ring of the rotating body 21. A first bevel gear 27 is installed on the rotating shaft 26 by welding. A second bevel gear 28 that extends into the ring is installed in the buffer bin 12. The second bevel gear 28 is fixed on the inner wall of the buffer bin 12 through a bracket, so that the second bevel gear 28 does not rotate. The first bevel gear 27 and the second bevel gear 28 are in right-angle meshing transmission. The first bevel gear 27 on the rotating shaft 26 meshes with the second bevel gear 28 in the buffer bin 12. The rotation of the rotating shaft 26 is realized through the rotation of the rotating body 21. In this way, when the rotating body 21 rotates, the materials in the temporarily storage cylinder 22 are mixed; A discharge pipe 29 is butted at the bottom of the buffer bin 12 through a flange. A screw conveyor driven by a motor is embedded in the discharge pipe 29. The bottom of the discharge pipe 29 is butted with the corresponding raw coal conveying pipeline 18 and tail coal conveying pipeline 19.

[0026] A push-up assembly 30 is installed at the hollow part of the rotating body 21. The push-up assembly 30 is installed on the inner wall of the buffer bin 12 by bolts and extends into the rotating body 21. A hemisphere 31 extending inward is installed on the inner wall of the first bevel gear 27 by welding. The push-up assembly 30 is a tapered rod driven by a cylinder. The hemisphere 31 contacts the outer wall of the tapered rod. A return spring 32 is sleeved in the rotating shaft 26. The two ends of the return spring 32 are against the first bevel gear 27 and the temporary storage tube 22. The sliding of the rotating shaft 26 is achieved by the return spring 32. When stirring is not required, the push assembly 30 is lifted, and the first bevel gear 27 is pushed up. The gear 27 is disengaged from the second bevel gear 28. Due to the material division and stirring, the meshing of the first bevel gear 27 and the second bevel gear 28 can be ensured by a high-strength aftertaste spring. A support plate 33 is installed in the temporary storage tube 22 and is in contact with the inner wall of the temporary storage tube 22. The support plate 33 is in contact with the bottom of the temporary storage tube 22. The support plate 33 is connected to the rotating shaft 26 through a bearing. The unloading is achieved by lifting the support plate 33. When unloading is required, it is lifted and then returned by the push-pull assembly, so that the support plate 33 is in an oscillating state. When unloading, the material is located below the support plate 33, which facilitates unloading.

[0027] A process whereby husks are added to fuel; 1. The husks are crushed to less than 0.65 mm by a coarse powder machine and a fine powder machine, and the crushed husks are respectively loaded into three fine powder bins 5 provided with weighing sensors for storage; The husks in the second and third fine powder bins 5 are transported to the second feeding spiral reamer 9 through the first feeding spiral reamer, and the second feeding spiral reamer 9 transports a certain amount of husks to the buffer bin 12. The corresponding petroleum coke powder is transported to the coke powder rotor scale 15 through the coke powder spiral reamer 14. The petroleum coke powder is measured by the coke powder rotor scale 15. The two transfer bins are connected to the coke powder rotor scale 15. The petroleum coke powder in the rotor scale is quantitatively transported to the buffer bin 12. The quantitative ratio of husks and petroleum coke powder is achieved through the second feeding spiral auger and the rotor scale. The husks and coke powder entering the buffer bin 12 are mixed. 3. The petroleum coke powder and husk in two buffer bins 12 are mixed and pneumatically conveyed to the rotary kiln and the decomposition furnace respectively, so that husk is added to the head coal and the tail coal. The pure husk in the other buffer bin 12 is pneumatically conveyed in the husk ignition pipeline 17, and the pure husk is used as an ignition material instead of the previous fuel oil to ignite the petroleum coke powder at the kiln head; IV. Ignite the pure rice husks in the rice husk pipeline 17. Due to the combustion characteristics of rice husks, the rapid temperature rise of the rotary kiln can be achieved. In this way, the temperature in the rotary kiln rises quickly. After the temperature in the rotary kiln rises, the mixture of rice husks and petcoke coal ejected from the burner can be quickly ignited. The high-temperature gas moves backward to the decomposition furnace. Similarly, the mixture of rice husks and petcoke coal ejected from the kiln tail can also be quickly ignited. By adding rice husks to the petcoke powder, the difficulty in igniting petcoke coal and its slow temperature rise are compensated. At the same time, the petcoke powder compensates for the disadvantages of low calorific value and high price of rice husks.

[0028] The density of the rice husk fuel powder is 0.45t / m3, which is low, the structure is loose, the volatile content is high, and most of the volatiles are released to produce flames at 250-350°C, quickly igniting the low-volatile petcoke powder ejected from the burner.

[0029] Due to the relatively high purchase price of rice husks, the value of fuel cost savings is not obvious. However, it improves the fuel characteristics of petcoke, and the activity in its ash can fully improve the burnability of the material, thus providing high saturation ratio and high silicate ratio calcination conditions, which can not only improve the quality of white clinker but also better alleviate the system ring formation and ensure the stable operation of the kiln system. Overall, its added value is relatively high.

Claims

1. A system for improving the combustion efficiency of petroleum coke powder by using rice husks, comprising a rice husk processing mechanism, a fuel supply mechanism, a fuel conveying mechanism and a fuel mixing mechanism. The rice husk processing mechanism and the fuel supply mechanism are both connected to the fuel mixing mechanism. The bottom of the fuel mixing mechanism is docked with the fuel conveying mechanism, and the end of the fuel conveying mechanism is communicated with the combustion mechanism. The fuel mixing mechanism conveys the mixed fuel to the combustion mechanism for combustion; The rice husk processing mechanism includes a rice husk storage tank, a rice husk coarse powder assembly, a rice husk fine powder assembly and a fine powder bin. The rice husks in the rice husk storage tank are conveyed into the coarse powder in the rice husk coarse powder assembly through a belt. Similarly, the rice husks in the rice husk coarse powder assembly are conveyed into the rice husk fine powder assembly through a screw conveyor assembly for fine powder processing. The rice husk fine powder assembly is connected to a material distribution box through a pipeline. There are three fine powder bins arranged below the material distribution box. A gate valve is arranged at the bottom of each fine powder bin. A first feeding screw reamer is arranged below each fine powder bin. The end of the first feeding screw reamer is docked with a second feeding screw reamer. The first feeding screw reamer and the second feeding screw reamer are connected and communicated with each other. Two of the buffer bins are docked with the fuel supply mechanism, and the end of the second feeding screw reamer is docked with the buffer bin. In this way, the rice husks and the fuel are conveyed into the buffer bin for mixing and then conveyed backward. The fuel conveying mechanism includes an ignited rice husk pipeline, a head coal conveying pipeline and a tail coal conveying pipeline. The fuel in the buffer bin directly enters the head coal conveying pipeline and the tail coal conveying pipeline. Fuel mixing mechanisms are installed in the buffer bins connected to the head coal conveying pipeline and the tail coal conveying pipeline respectively. A discharge pipe is docked at the bottom of each buffer bin. The ignited rice husk pipeline, the head coal conveying pipeline and the tail coal conveying pipeline are respectively communicated with the corresponding discharge pipes. The ignited rice husk pipeline only conveys rice husks. The fuel and the rice husks are conveyed to the combustion mechanism through the ignited rice husk pipeline, the head coal conveying pipeline and the tail coal conveying pipeline.

2. The system for improving the combustion efficiency of petroleum coke powder by using rice husk according to claim 1, wherein, The second feeding screw reamer is equipped with a small-range metering device to realize DCS control of the addition amount of rice husk powder and accurate addition.

3. A system for improving the combustion efficiency of petroleum coke powder by using rice husk according to claim 2, characterized in that, To reduce the metering accuracy caused by the increased weight of the rotor scale due to the addition of equipment such as reamers, soft connections are adopted between the first feeding screw reamer and the second feeding screw reamer, and between the second feeding screw reamer and the buffer bin.

4. A system for improving the combustion efficiency of petroleum coke powder by using rice husk according to claim 3, characterized in that, The fuel supply mechanism is a coke powder screw reamer connected to the bottom connecting pipe of the petroleum coke powder storage. A coke powder rotor scale is docked with the coke powder screw reamer. The bottom of the coke powder rotor scale is communicated with the top of the buffer bin to quantitatively convey coke powder into the buffer bin.

5. A system for improving the combustion efficiency of petroleum coke powder by using rice husk according to claim 4, characterized in that, Anti-blocking components are provided in the husk storage box and the fine powder bin. The anti-blocking components are compressed air blowing pipes. The husk storage box and the fine powder bin are both equipped with vertically installed compressed air blowing pipes. Multiple groups of nozzles arranged at equal intervals up and down are installed on the compressed air blowing pipes. The nozzles are arranged obliquely upward. The nozzles are connected with the compressed air blowing pipes. The nozzles are connected with the compressed air blowing pipes through hollow tubes. A blocking block is installed on the compressed air blowing pipe. An air pump is installed on the top of the compressed air blowing pipe. The bottom of the compressed air blowing pipe is closed. A screw driven by a motor is installed in the compressed air blowing pipe. The screw passes through the blocking block. The empty cross-section in the compressed air blowing pipe is a polygon. The lifting and lowering of the blocking block is achieved by the screw.

6. A system for improving the combustion efficiency of petroleum coke powder by using rice husk according to claim 5, characterized in that, A fuel mixing mechanism is arranged in each buffer bin, and the fuel mixing mechanism includes a rotating body, a temporary storage cylinder and a stirring blade, wherein a separation funnel is installed in the buffer bin, and the buffer bin is divided into an upper and a lower layer by the separation funnel. The upper layer of the buffer bin is connected with the second feeding spiral reamer and the coke powder rotor scale, and the lower layer of the buffer bin is a horizontal circular cavity, and a horizontal rotating body that fits the inner wall is embedded in the circular cavity. The rotating body is driven by a motor, and a plurality of temporary storage cylinders distributed in a circular array are installed on the rotating body. The temporary storage cylinder is connected to the bottom of the separation funnel on one side through the rotation of the rotating body. A rotating shaft is installed in a temporary storage cylinder, and a stirring blade is installed on the rotating shaft. The rotating body is a hollow ring in the middle. The rotating shaft passes through the rotating body and extends into the ring of the rotating body. A first bevel gear is installed on the rotating shaft, and a second bevel gear extending into the ring is installed in the buffer bin. The first bevel gear on the rotating shaft is meshed with the second bevel gear in the buffer bin, and the rotation of the rotating shaft is achieved by the rotation of the rotating body; a discharge pipe is connected to the bottom of the buffer bin, and an auger driven by a motor is installed in the discharge pipe, and one end of the discharge pipe is connected to the corresponding head coal conveying pipeline and the tail coal conveying pipeline, which are connected to the ignited husk pipeline.

7. The system for improving the combustion efficiency of petroleum coke powder by using rice husk according to claim 6, characterized in that, A push-out assembly is installed at the hollow part of the rotating body. The push-out assembly is installed on the inner wall of the buffer bin and extends into the rotating body. A hemisphere extending inward is installed on the inner wall of the first bevel gear. The push-out assembly is a tapered rod driven by a cylinder. The hemisphere contacts the outer wall of the tapered rod. A return spring is sleeved in the rotating shaft. Both ends of the return spring abut against the first bevel gear and the temporary storage cylinder. The sliding of the rotating shaft is achieved by the return spring. A support plate that fits the inner wall of the temporary storage cylinder is installed in the temporary storage cylinder. The support plate fits the bottom of the temporary storage cylinder. The support plate is connected to the rotating shaft through a bearing. Unloading is achieved by lifting and lowering the support plate.

8. A process for adding husk as fuel to the system for improving the combustion efficiency of petroleum coke powder by using husk according to claim 1, characterized in that ； 1. The husks are crushed to less than 0.65 mm by a coarse powder machine and a fine powder machine, and the crushed husks are respectively loaded into three fine powder bins equipped with weighing sensors for storage; Second, the husks in the two or three fine powder silos are conveyed to the second feeding screw reamer through the first feeding screw auger. The second feeding screw reamer conveys a fixed quantity of husks into the buffer bin. The corresponding petroleum coke powder is conveyed to the coke powder rotor weigher through the coke powder screw reamer. The petroleum coke powder is metered by the coke powder rotor weigher. The two transfer bins are connected to the coke powder rotor weigher. The petroleum coke powder in the rotor weigher is quantitatively conveyed into the buffer bin. The quantitative ratio of husks and petroleum coke powder is realized through the second feeding screw auger and the rotor weigher, and the husks and petroleum coke powder entering the buffer bin are mixed; Third, the petroleum coke powder and husks in two of the buffer bins are mixed and then conveyed into the rotary kiln and the decomposition furnace respectively by pneumatic conveyor belts. In this way, husks are added to the head coal and tail coal. The pure husks in the other buffer bin are conveyed through the pneumatic ignition husk pipeline. The pure husks are used as an igniter to replace the previous fuel oil to ignite the petroleum coke powder at the kiln head; Fourth, the pure husks in the ignition husk pipeline are ignited. Due to the combustion characteristics of the husks, the rapid heating of the rotary furnace can be achieved. Thus, the temperature in the rotary furnace rises quickly. When the temperature in the rotary furnace rises, the mixture of husks and petroleum coke coal ejected from the burner can be quickly ignited. The high-temperature gas moves backward to the decomposition furnace. Similarly, the mixture of husks and petroleum coke coal ejected from the kiln tail can also be quickly ignited. By adding husks to the petroleum coke powder, the difficulties in igniting the petroleum coke coal and the slow heating rate are compensated. At the same time, the petroleum coke powder compensates for the disadvantages of the low calorific value and high price of the husks.

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