CN116966996A - Cement grinding system and method with screw conveyor - Google Patents
Cement grinding system and method with screw conveyor Download PDFInfo
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- CN116966996A CN116966996A CN202311001880.XA CN202311001880A CN116966996A CN 116966996 A CN116966996 A CN 116966996A CN 202311001880 A CN202311001880 A CN 202311001880A CN 116966996 A CN116966996 A CN 116966996A
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- 239000004568 cement Substances 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims description 29
- 239000000843 powder Substances 0.000 claims abstract description 150
- 239000000463 material Substances 0.000 claims abstract description 97
- 239000002994 raw material Substances 0.000 claims abstract description 60
- 239000000428 dust Substances 0.000 claims abstract description 36
- 238000007599 discharging Methods 0.000 claims abstract description 14
- 238000005096 rolling process Methods 0.000 claims description 6
- 230000007480 spreading Effects 0.000 claims description 3
- 238000003892 spreading Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 19
- 238000012545 processing Methods 0.000 abstract description 6
- 230000009467 reduction Effects 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 230000006872 improvement Effects 0.000 description 5
- 230000007774 longterm Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000004913 activation Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002055 nanoplate Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/02—Feeding devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C19/00—Other disintegrating devices or methods
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Cyclones (AREA)
Abstract
The application relates to the technical field of cement production, and discloses a cement grinding system with a screw conveyor, which comprises a double cyclone dust collector, a screw conveyor I, a screw conveyor II, a powder selecting machine and a mill; the double cyclone dust collector finishes discharging according to a set opening degree through a material distributing valve of the cyclone cylinder; a first material distributing outlet of the material distributing valve is respectively connected with the material inlet ends of the first spiral conveyor and the second spiral conveyor; the second material distributing outlets of the material distributing valves are connected with the material inlet end of the mill; the discharge ends of the screw conveyors are connected with the feed end of the powder selecting machine; the powder selecting machine is provided with a finished product discharge port and a regrind discharge port; the finished product discharge port of the powder concentrator is connected with a finished product collecting system, and the grinding return discharge port is connected with the feeding end of the grinding machine; the discharge port of the mill is connected with the feed end of the powder selecting machine; the serial processing mode that 100% of original raw materials need to be ground firstly and then powder is changed into the shunt parallel processing mode, so that the efficiency of each device can be effectively exerted, and the production and consumption reduction of the whole system are further realized.
Description
Technical Field
The application relates to the technical field of cement production, in particular to a cement grinding system with a screw conveyor and a cement grinding method.
Background
The main technological process of cement production includes the steps of compounding raw material, vertical grinding, homogenizing, preheating, decomposing, denitrating and cooling to obtain clinker, compounding the clinker and other material, grinding and homogenizing to obtain cement product. The cement grinding is the final procedure of cement manufacture, and the main function of the cement grinding is to grind cement clinker to proper granularity, form certain grain composition, increase the hydration area of the cement clinker, accelerate the hydration rate, meet the coagulation and hardening requirements of cement paste, directly influence the quality of cement, and simultaneously be the procedure with the greatest power consumption, thus becoming an improvement procedure which is focused on the aspects of yield improvement and consumption reduction of cement enterprises.
The existing cement grinding system is characterized in that a mill is connected behind a double cyclone dust collector, then the double cyclone dust collector is connected with a powder selecting machine, all materials collected by the double cyclone dust collector are sent to the mill for grinding, all the ground materials are sent to the powder selecting machine, powder is selected according to a discharging standard, qualified materials are discharged, and unqualified materials are sent to the mill for grinding. In the long-term practical use and detection process, 50% of the materials collected by the double cyclone dust collectors meet the powder selection standard, and the powder selection standard is not needed to be ground again, so that the materials which reach the powder selection standard are ground again, repeatedly and invalidity is realized, the grinding operation load of the grinding machine is increased, the grinding efficiency is reduced, the powder selection machine is used for concentrating the powder after the grinding machine finishes grinding all the materials, the powder selection amount of each batch is large, the operation load of the powder selection machine is increased, the powder selection time is prolonged, and the efficiency is low; meanwhile, the running load of all machines must be controlled within a reasonable range, so in the existing cement grinding system, in order to ensure stable, good and safe running of the machines, the amount of ground materials must be controlled, which directly results in the conditions of low production efficiency and low yield per unit time. The cement grinding is dominant in the cement production process, directly influences the quality of cement, optimizes and reforms the existing cement grinding system, adopts advanced technology and advanced equipment as far as possible, ensures that the hourly output of the same-scale ball mill exceeds the original design index, reduces the production cost, ensures that the quality of the finished product meets the new standard requirement of cement, and is a significant work.
Disclosure of Invention
The application aims to provide a cement grinding system with a screw conveyor and a cement grinding method, which are used for solving the technical problems of high equipment operation load and low efficiency of the conventional grinding system.
The basic scheme provided by the application is as follows: the cement grinding system with screw conveyer includes double cyclone dust collector, screw conveyer I, screw conveyer II, powder separator and grinder; the double cyclone dust collector comprises a first cyclone cylinder and a second cyclone cylinder; the cyclone cylinder I and the cyclone cylinder II are conical, and the bottom of the cone is fixedly connected with a distributing valve I and a distributing valve II respectively; the first distributing valve and the second distributing valve are respectively provided with a first distributing outlet and a second distributing outlet, and discharging is finished according to the opening degree set by each distributing valve; the first material distributing outlets of the two material distributing valves are respectively connected with the feeding ends of the first spiral conveyor and the second spiral conveyor; the second material distributing outlets of the two material distributing valves are connected with the material inlet end of the mill; the discharge ends of the first spiral conveyor and the second spiral conveyor are connected with the feed end of the powder selecting machine; the powder selecting machine is provided with a finished product discharge port and a regrind discharge port; the finished product discharge port of the powder concentrator is connected with a finished product collecting system, and the grinding return discharge port is connected with the feeding end of the grinding machine; and a discharge hole of the mill is connected with a feed end of the powder selecting machine.
The working principle and the advantages of the application are as follows: after the processing of the pre-procedure, about 80% of raw materials meet the standard of finished products, so that the serial processing mode that 100% of raw materials are required to be ground firstly and then subjected to powder selection is changed into a shunt parallel processing mode, the raw materials are shunted by adding a material dividing valve at the outlet end of a double cyclone dust collector, one part of the raw materials enter a grinder for grinding, and the other part of the raw materials enter a powder selecting machine for directly selecting powder through a screw conveyor.
Firstly, in the parallel operation mode, compared with the serial operation mode, the grinding and powder selecting are synchronously carried out, the amount of the processed raw materials is easier to control, and the production efficiency is improved; after raw materials are split, the amount of raw materials entering a mill and a powder selecting machine in unit time is reduced, part of raw materials can be directly sent to a finished product collecting system through powder selecting, powder selecting efficiency is improved, grinding procedures are reduced, repeated grinding is avoided, further, the running load of the machine is reduced, the service life of the machine is prolonged, and grinding and powder selecting efficiency and quality are improved; analyzing the structural characteristics of the double cyclone dust collector, respectively installing a distributing valve at the bottoms of two cyclone cones, and setting the opening separately, so that the distribution of the whole system can be flexibly adjusted, the balance and stable operation of each device in the system are protected, the efficiency of each device can be effectively exerted, and the production and consumption of the whole system are further improved.
Further, the set opening range is 60% -80%.
The beneficial effects are that: the setting of the range gives consideration to the balance among the quantity of the raw materials for repeated grinding, the yield of finished products per unit machine hour and the operation load of the powder concentrator, so that the quantity of the raw materials for repeated grinding is in a proper range, the powder concentrator can be ensured to operate under a high-performance working condition, and the ideal yield of finished products per unit machine hour can be ensured.
Further, the opening degree settings of the first distributing valve and the second distributing valve are the same or different.
The beneficial effects are that: the opening degree is more flexible to adjust, and the number of adjustable modes is increased by square times.
Further, the length of the first screw conveyor is longer than that of the second screw conveyor.
The beneficial effects are that: the powder selecting machine and the double cyclone dust collectors connected with the two ends of the screw conveyor are reasonably arranged according to the layout of the whole production factory, and meanwhile, the quantity of the powder scattering disc connected into the powder selecting machine is more reasonable, so that the powder is more uniform when the powder selecting machine operates for selecting powder, and the powder selecting efficiency is improved.
Further, the first spiral conveyor and the second spiral conveyor are arranged in parallel side by side according to a set inclination angle, the lower end is a feeding end connected with the first material distributing outlet, and the higher end is a discharging end connected with the powder selecting machine. The set inclination angle ranges from 0 degrees to 10 degrees.
The beneficial effects are that: the device has a certain inclination angle, has little influence on power demand, but can improve the stability in the raw material conveying process.
The application provides a cement grinding system with a screw conveyor and a cement grinding method with the screw conveyor, which are used for solving the technical problems of high equipment operation load and low efficiency of the conventional grinding system.
The method comprises the following steps:
step one: setting the opening of the first distributing valve and the second distributing valve to 60%;
step two: the raw materials formed after the batching and rolling are conveyed to a double cyclone dust collector through an air duct of a V-shaped powder separator, a cyclone one and a cyclone two of the double cyclone dust collector are respectively collected, and are respectively separated through a material separating valve one and a material separating valve two;
step three: 60% of raw materials of the first cyclone and the second cyclone are respectively conveyed to a material spreading disc of the powder selecting machine through a material distributing outlet of the first distributing valve and a material distributing outlet of the second distributing valve through a first screw conveyor and a second screw conveyor; 40% of raw materials are respectively conveyed to a feed inlet of the mill through a feed outlet II of a feed valve I and a feed outlet II of a feed valve II;
step four: 60% of raw materials conveyed to a powder selecting machine are subjected to powder selecting according to a powder selecting standard, and qualified raw materials are conveyed to a finished product integrated system to be subjected to the next working procedure; conveying unqualified raw materials to a feed inlet of a mill for regrinding; meanwhile, 40% of raw materials and unqualified raw materials conveyed to a mill are ground by the mill, and then conveyed to a feed inlet of a powder selecting machine for powder selecting according to a powder selecting standard after finishing, and the circulation is performed.
And step five, the opening degree of the first distributing valve and the opening degree of the second distributing valve are adjusted according to the load current of the powder concentrator and the finished product yield per unit time in a set adjusting mode.
The beneficial effects are that: considering the operation load problem of the powder concentrator, when the powder concentrator is used for the first time, the opening degree of the material distributing valve is required to be adjusted to be smaller so as to ensure that the operation load condition of the powder concentrator is observed, and the overload operation of the powder concentrator caused by overlarge adjustment is avoided, so that the machine is damaged.
And when the load current of the powder concentrator and the yield of the finished product per unit machine are lower than the corresponding threshold range, increasing the opening, firstly adjusting the second distributing valve, then adjusting the first distributing valve, alternately adjusting the first distributing valve, increasing the opening by 10% each time, observing the load current of the powder concentrator and the yield of the finished product per unit machine after each adjustment until the load current and the yield of the finished product per unit machine are all within the threshold range, and stopping adjusting.
The beneficial effects are that: the first and second distributing valves are alternately adjusted, so that the load current of the powder selector and the yield of finished products per unit machine hour can be considered, the conveying capacity of the two conveyors is balanced, and meanwhile, the positions of the two conveying machines entering the powder selector from the two inlets are balanced, so that the problem of operation of the powder selector is avoided due to large weight difference.
Further, the threshold range of the load current of the powder concentrator is 150-200A; the threshold range of the unit station yield is 210-230 tons.
The method has the beneficial effects that according to the long-term observation of the actual production and the overall operation condition of the system, the efficient operation of the machine can be ensured within the threshold range, and meanwhile, the more reasonable yield can be obtained.
In the existing cement production and manufacturing process, a screw conveyor is not always selected for conveying cement clinker, the common conveyor is only in a linear movement mode for conveying, the linear conveying mode is higher in efficiency, the screw conveying path is long, the efficiency is low, meanwhile, the temperature of the cement clinker is high, if the screw conveyor is utilized to easily cause accumulation, but in fact, the screw conveyor is pushed by utilizing a screw negative pressure mode, the conveying is more stable, the conveying efficiency is higher through testing, in addition, after the clinker passes through a dust collector, the temperature of the clinker is reduced, the condition of stacking caused by high temperature after entering the screw conveyor is avoided, meanwhile, as the powder selecting machine is connected to a discharging end of the screw conveyor for selecting powder, the clinker which enters the powder selecting machine is fully dispersed through rotation of the screw conveyor, and the powder selecting efficiency of the powder selecting machine is further improved.
For the whole grinding system, the loss in the grinding process is more focused in the prior art, but because the materials entering the cyclone dust collector are very light and drift, the transportation loss and the raw material input loss are ignored, the processing is not carried out, and different statistics is carried out, and different feeding losses are different, the scheme sets the opening of the distributing valve, has the speed and the loss of different feeding and discharging, can well match the feeding and discharging amount, the discharging loss and the machine operation load, and ensures that the whole system operates with high efficiency.
Drawings
Fig. 1 is a block diagram of a cement grinding system with a screw conveyor according to an embodiment of the present application.
Fig. 2 is a schematic structural diagram of a cement grinding system with a screw conveyor according to an embodiment of the present application.
Fig. 3 is a schematic structural diagram of a distributing valve according to an embodiment of the present application.
Fig. 4 is a flowchart of a cement grinding method with a screw conveyor according to an embodiment of the present application.
Detailed Description
The following is a further detailed description of the embodiments:
the labels in the drawings of this specification include: the cyclone dust collector comprises a double cyclone dust collector 100, a first screw conveyor 200, a second screw conveyor 300, a powder selecting machine 400, a mill 500, a cyclone 101, a distributing valve 102, a first distributing outlet 103 and a second distributing outlet 104.
An example is substantially as shown in figures 1 and 2: the cement grinding system with the screw conveyor comprises a double cyclone dust collector 100, a screw conveyor I200, a screw conveyor II 300, a powder selecting machine 400 and a mill 500; the double cyclone dust collector 100 comprises a cyclone cylinder 101I and a cyclone cylinder 101 II; the cyclone cylinder 101A and the cyclone cylinder 101B are both conical, and the bottom of the cone is fixedly connected with a first material distributing valve 102 and a second material distributing valve 102 respectively; the first distributing valve 102 and the second distributing valve 102 are respectively provided with a first distributing outlet 103 and a second distributing outlet, and discharging is finished according to the opening degree set respectively; the first material distributing outlets 103 of the two material distributing valves 102 are respectively connected with the feeding ends of the first screw conveyor 200 and the second screw conveyor 300; the second material distributing outlets of the two material distributing valves 102 are connected with the material inlet end of the mill 500, specifically, the second material distributing outlet of the first material distributing valve 102 is connected with the material inlet of the mill 500, and the second material distributing outlet of the second material distributing valve 102 is connected with the material inlet of the mill 500; the discharge ends of the first screw conveyor 200 and the second screw conveyor 300 are connected with the feed end of the powder concentrator 400, specifically, the first screw conveyor 200 is connected with the feed inlet I of the powder concentrator 400, and the second screw conveyor 300 is connected with the feed inlet II of the powder concentrator 400; the powder concentrator 400 is provided with a finished product discharge port and a regrind discharge port; the finished product discharge port of the powder concentrator 400 is connected with a finished product collecting system, and the regrind discharge port is connected with the feeding end of the mill 500, in particular, is connected with the feeding port III of the mill 500; the discharge port of the mill 500 is connected with the feed end of the powder concentrator 400, and specifically, is connected with the feed port III of the powder concentrator 400.
Raw materials are subjected to batching and rolling before entering the double cyclone dust collector 100, in the actual production process, about 80% of raw materials after batching and rolling meet the finished product standard, and in order to avoid repeated grinding of raw materials which reach the finished product standard, the raw materials formed after batching and rolling in the scheme are conveyed into the double cyclone dust collector 100 through an air duct of the V-shaped powder selector 400 through an air inlet of the double cyclone dust collector 100, and after the double cyclone dust collector 100 is separated through a material separating valve 102, a part of the raw materials enter a mill 500 to grind, so that the grinding amount of the mill 500 is reduced, the operation load of the machine is reduced, a part of the raw materials enter the powder selector 400 through a screw conveyor to directly select powder, the grinding procedure is reduced, repeated grinding is avoided, the powder selecting efficiency is improved, the operation load of the powder selector 400 is further reduced, and the service life of the machine is prolonged.
In this embodiment, the number of the double cyclone dust collector 100 is 3417c, and high-efficiency dust collection is performed. The double cyclone dust collector 100 comprises a cyclone cylinder 101I and a cyclone cylinder 101 II; the first cyclone cylinder 101 and the second cyclone cylinder 101 are conical, and the diameter of the conical top surface is 3550mm; the bottom of the cone is fixedly connected with a first distributing valve 102 and a second distributing valve 102 respectively. As shown in fig. 3, in this embodiment, the material distributing valve 102 is a three-way chute, the main body is made of a composite wear-resistant steel plate (8+6mm), the front and back surfaces of the internal turning plate are overlaid with a wear-resistant layer with a thickness of 6-8mm or a layer of composite wear-resistant steel plate (6+6mm) is adhered, and due to long-term contact with raw materials, the structural material is set, so that the whole material distributing valve 102 is more wear-resistant, and the service life is prolonged. The first distributing valve 102 and the second distributing valve 102 are respectively provided with a first distributing outlet 103 and a second distributing outlet 103, the first distributing outlets 103 of the two distributing valves 102 are respectively connected with the feeding ends of the first screw conveyor 200 and the second screw conveyor 300, and partial raw materials are sent to the powder selecting machine 400 for powder selecting through the screw conveyors; the second material distributing outlets of the two material distributing valves 102 are connected with the material inlet of the mill 500, and part of raw materials are sent to the mill 500 for grinding.
The first material distributing valve 102 and the second material distributing valve 102 respectively finish discharging according to the respective set opening degrees, specifically, a valve adjusting handle and an arc dial are installed at the outer end of the material distributing valve 102, 9 holes are formed in the arc dial, the opening degree of adjustment between the two holes is 10%, the opening degree of an inner material distributing plate can be driven by adjusting the position of the valve adjusting handle on the arc dial, and the opening degree is adjusted to 90% at most, so that the full-load and no-load running conditions of the mill 500 and the powder selecting machine 400 caused by the material distributing proportion of 100% and 0 are avoided. The set opening range is 60% -80%, and the determination of the range is that after long-term production, 80% of raw materials meet the requirement of finished products, so that the maximum opening of the material dividing valve 102 is set to 80%, the least raw materials can be ground, and the repeated grinding quantity is the least, but in the actual production process, the set opening is influenced by the working conditions of the powder selecting machine 400 and the grinding machine 500 and the finished product yield per unit machine, and the larger the opening is, the higher the finished product yield per unit machine is, the larger the load of the powder selecting machine 400 is, and therefore, the working conditions of the powder selecting machine 400 and the grinding machine 500 and the finished product yield per unit machine can be effectively balanced within the range, and the whole system is ensured to operate in a better state. In this embodiment, the first and second distributing valves 102 and 102 are both set at 70%, that is, the first distributing outlet 103 is 70% of the raw material, the second distributing outlet is 30% of the raw material, and the opening is set for long-time practical use, so that the powder selecting machine 400 is in a relatively efficient operation condition, the powder selecting efficiency of the powder selecting machine 400 is improved to about 80%, the operation load of the cement grinding machine 500 is reduced, the unit hourly output of the cement grinding system is improved from 198 tons per hour to 225 tons per hour, and the power consumption of cement grinding is reduced from 34 degrees to 30.5 degrees.
It is to be noted that, compared with other conveying equipment, the environment temperature of the screw conveyor is-20-50 ℃; the multi-point loading and unloading device has the advantages of simple structure, small cross section size, good sealing performance, capability of loading and unloading at multiple points in the middle, safe and convenient operation, low manufacturing cost and the like. In the embodiment, the screw conveyor is LS-400 in type and 70t/h in conveying capacity, the shell, the blades and the main shaft are all made of wear-resistant materials, and the conveying length is generally smaller than 40m and is not longer than 70m at maximum.
The scheme comprises a first screw conveyor 200 and a second screw conveyor 300, wherein the feeding ends are respectively connected with a first material distributing outlet 103 of two material distributing valves 102, the discharging ends are both connected with the feeding ends of a powder selecting machine 400, partial raw materials are sent to the powder selecting machine 400 for powder selecting, the whole conveying process is fully sealed, and the screw negative pressure pushing and conveying efficiency is high. The first screw conveyor 200 has a length greater than that of the second screw conveyor 300. According to the embodiment, the length of the specially selected screw conveyor I200 is 8m, the length of the screw conveyor II 300 is 7m, the powder selecting machine 400 and the double cyclone dust collectors 100 connected with the two ends of the screw conveyor are reasonably arranged according to the layout of the whole production factory and the structure of the double cyclone dust collectors 100, and the feeding port of the powder selecting machine 400 is connected. The first screw conveyor 200 and the second screw conveyor 300 are installed in parallel side by side according to a set inclination angle, the lower end is a feeding end connected with the first material distributing outlet 103, and the upper end is a discharging end connected with the powder selecting machine 400. The set inclination angle ranges from 0 degrees to 10 degrees. In this embodiment, the set inclination angle is 7.5 degrees of the elevation angle, and the setting of the angle can be matched with the positions of the double cyclone dust collector 100 and the powder concentrator 400, and meanwhile, the stability in the raw material conveying process can be improved.
In this embodiment, the material is fed from the feeding port of the powder concentrator 400N-3500 type O-SEPA powder concentrator 400, centrifugally scattered by the scattering disc, uniformly dispersed by the buffer plate, falls into the annular classification area, is mixed with the gas of the classification air flow after being guided, and the coarser particles in the material are thrown to the guide plate under the action of the rotating classification air flow, fall into the conical ash hopper along the classification chamber, and are classified again by the air rinsing of the air pipe, wherein the powder concentrator 400 has a finished product discharge port and a regrinding discharge port; the finished product discharge port of the powder selecting machine 400 is connected with a finished product collecting system, fine powder is conveyed to the finished product collecting system, the grinding return discharge port is connected with the feed port of the grinding machine 500, and coarse powder is ground again by the grading conveying grinding machine 500.
It should be noted that, because of the impact and friction between a large number of grinding bodies and between the grinding bodies and the lining board, the conventional grinding machine 500 generates a large amount of heat, which is transmitted to the slip ring through the cylinder to raise the temperature of the slip shoe, but the temperature lowering and heat insulation effects of the slip shoe are poor, the viscosity of the lubricating oil is lowered, the bearing capacity is lowered, even dry friction is caused, and the slip shoe is burned seriously. In long-term grinding practice, the flowability of the material is poor, the material needs to be turned over for a long time until the powder is uniform, and the powder grinding efficiency is low as a whole. Therefore, the mill 500 of this scheme adopts the nano plate to insulate against heat, is showing to promote thermal-insulated effect more than four times, and the activation ring sets up perpendicularly to grinding cylinder body, and when the material rolls in grinding cylinder body and grinds, the activation ring has played the effect that stops the material flow, prevents that the material velocity of flow from being too fast, prolongs the grinding time of material in the fine grinding storehouse, improves grinding efficiency and mill 500 productivity.
When the system is used, as shown in fig. 4, step one: setting the opening degree of the first and second distributing valves 102 and 102 to 60%;
step two: the raw materials formed after the batching and rolling are conveyed to the double cyclone dust collector 100 through the air duct of the V-shaped powder separator 400, the cyclone cylinder 101I and the cyclone cylinder 101 II of the double cyclone dust collector 100 are respectively collected, and the raw materials are respectively separated through the material separating valve 102I and the material separating valve 102 II;
step three: 60% of raw materials of the first cyclone cylinder 101 and the second cyclone cylinder 101 are respectively conveyed to a material spreading disc of a powder selecting machine 400 through a first spiral conveyor 200 and a second spiral conveyor 300 through a first material distributing outlet 103 of a first material distributing valve 102 and a second material distributing valve 102; 40% of raw materials are respectively conveyed to a feed inlet of the mill 500 through a first material distributing valve 102 and a second material distributing outlet of a second material distributing valve 102;
step four: 60% of raw materials conveyed to the powder selector 400 are subjected to powder selection according to a powder selection standard, and qualified raw materials are conveyed to a finished product integrated system to be subjected to the next process; the unqualified raw materials are conveyed to a feed inlet of the mill 500 for grinding; meanwhile, 40% of raw materials and unqualified raw materials which are conveyed to the mill 500 are ground by the mill 500, and are conveyed to a feed inlet of the powder selector 400 to be subjected to powder selection according to a powder selection standard after finishing the grinding, and the circulation is performed. Through the improvement of the scheme, the efficiency of the powder selector 400 is improved to about 80%, about 80% of qualified fine powder is conveyed to a finished product collecting system, about 20% of unqualified coarse powder is conveyed to the mill 500 for grinding again, and the ground materials are conveyed to the powder selector 400 for powder selection again.
And step five, according to the load current of the powder concentrator 400 and the unit machine hour finished product yield, the opening degree of the first distributing valve 102 and the opening degree of the second distributing valve 102 are adjusted according to a set adjusting mode.
The set adjusting mode is to increase the opening when the load current of the powder selecting machine 400 and the product yield per unit machine are lower than the corresponding threshold range, firstly adjust the second distributing valve 102, then adjust the first distributing valve 102, alternately adjust the opening each time by 10%, observe the load current of the powder selecting machine 400 and the product yield per unit machine after each adjustment until the load current and the product yield per unit machine are all within the threshold range, and stop adjusting. The load current of the powder concentrator 400 is controlled between 150 and 200A, and the finished product yield per unit station is controlled between 210 and 230 tons. Specifically, when the product yield per unit time is found to be lower than 210 tons, the second opening degree of the distributing valve 102 is adjusted to be 70%, after adjustment, the opening degree is maintained if the load current of the powder concentrator 400 is kept within 150A-200A, the product yield per unit time is raised to be more than 210 tons, if the product yield per unit time is still lower than 210 tons, the first opening degree to be 70% of the distributing valve 102 is adjusted, after adjustment, the load current of the powder concentrator 400 is kept within 150A-200A, and the product yield per unit time is raised to be more than 210 tons, and the opening degree is maintained.
According to the scheme, the raw materials entering the double cyclone dust collector are efficiently split through the distributing valve and the screw conveyor, a part of the raw materials enter the mill for grinding, a part of the raw materials enter the powder selecting machine through the screw conveyor for direct powder selecting, the raw materials are subjected to powder selecting, compared with original full-material grinding, the single-time grinding amount is less, the repeated grinding is reduced, the power consumption of the mill is reduced, compared with the raw materials which are subjected to full-material powder selecting after the original waiting mill grinding, the single-time powder selecting amount is less, and the powder selecting efficiency is higher. Although the materials entering the powder selecting machine and the mill are fewer, the materials are controlled in a reasonable range, because the influence of the operation load current of the powder selecting machine and the product yield per unit time on the opening of the distributing valve is combined, the opening of the distributing valve is reasonably arranged, on one hand, the distributing mode of the whole system can be flexibly adjusted, on the other hand, the materials entering the powder selecting machine and the mill are kept in a proper opening range, the materials entering the powder selecting machine and the mill are kept in a reasonable range, the powder selecting machine can be operated under a high-performance working condition, the efficiency of each device can be effectively exerted, the satisfactory yield can be obtained, and the yield improvement and consumption reduction of the whole system are realized.
The foregoing is merely an embodiment of the present application, and a specific structure and characteristics of common knowledge in the art, which are well known in the scheme, are not described herein, so that a person of ordinary skill in the art knows all the prior art in the application date or before the priority date, can know all the prior art in the field, and has the capability of applying the conventional experimental means before the date, and a person of ordinary skill in the art can complete and implement the present embodiment in combination with his own capability in the light of the present application, and some typical known structures or known methods should not be an obstacle for a person of ordinary skill in the art to implement the present application. It should be noted that modifications and improvements can be made by those skilled in the art without departing from the structure of the present application, and these should also be considered as the scope of the present application, which does not affect the effect of the implementation of the present application and the utility of the patent.
Claims (10)
1. The cement grinding system with the screw conveyor is characterized by comprising a double cyclone dust collector, a screw conveyor I, a screw conveyor II, a powder selecting machine and a mill; the double cyclone dust collector comprises a first cyclone cylinder and a second cyclone cylinder; the cyclone cylinder I and the cyclone cylinder II are conical, and the bottom of the cone is fixedly connected with a distributing valve I and a distributing valve II respectively; the first distributing valve and the second distributing valve are respectively provided with a first distributing outlet and a second distributing outlet, and discharging is finished according to the opening degree set by each distributing valve; the first material distributing outlets of the two material distributing valves are respectively connected with the feeding ends of the first spiral conveyor and the second spiral conveyor; the second material distributing outlets of the two material distributing valves are connected with the material inlet end of the mill; the discharge ends of the first spiral conveyor and the second spiral conveyor are connected with the feed end of the powder selecting machine; the powder selecting machine is provided with a finished product discharge port and a regrind discharge port; the finished product discharge port of the powder concentrator is connected with a finished product collecting system, and the grinding return discharge port is connected with the feeding end of the grinding machine; and a discharge hole of the mill is connected with a feed end of the powder selecting machine.
2. The cement grinding system with screw conveyor according to claim 1, wherein the set opening range is 60% -80%.
3. The cement grinding system with a screw conveyor according to claim 1, wherein the opening degree settings of the first and second distributing valves are the same or different.
4. The cement grinding system with screw conveyor of claim 1, wherein the first screw conveyor has a length greater than the second screw conveyor.
5. The cement grinding system with the screw conveyor according to claim 1, wherein the screw conveyor I and the screw conveyor II are arranged in parallel side by side according to a set inclination angle, the lower end is a feeding end connected with the first material distributing outlet, and the upper end is a discharging end connected with the powder selecting machine.
6. The cement grinding system with screw conveyor according to claim 4, wherein the set inclination angle ranges from 0 to 10 degrees.
7. A method of grinding cement with a screw conveyor, characterized by using the cement grinding system with a screw conveyor according to any one of claims 1 to 6, the method comprising the steps of:
step one: setting the opening of the first distributing valve and the second distributing valve to 60%;
step two: the raw materials formed after the batching and rolling are conveyed to a double cyclone dust collector through an air duct of a V-shaped powder separator, a cyclone one and a cyclone two of the double cyclone dust collector are respectively collected, and are respectively separated through a material separating valve one and a material separating valve two;
step three: 60% of raw materials of the first cyclone and the second cyclone are respectively conveyed to a material spreading disc of the powder selecting machine through a material distributing outlet of the first distributing valve and a material distributing outlet of the second distributing valve through a first screw conveyor and a second screw conveyor; 40% of raw materials are respectively conveyed to a feed inlet of the mill through a feed outlet II of a feed valve I and a feed outlet II of a feed valve II;
step four: 60% of raw materials conveyed to a powder selecting machine are subjected to powder selecting according to a powder selecting standard, and qualified raw materials are conveyed to a finished product integrated system to be subjected to the next working procedure; conveying unqualified raw materials to a feed inlet of a mill for regrinding; meanwhile, 40% of raw materials and unqualified raw materials conveyed to a mill are ground by the mill, and then conveyed to a feed inlet of a powder selecting machine for powder selecting according to a powder selecting standard after finishing, and the circulation is performed.
8. The cement grinding method with a screw conveyor according to claim 7, further comprising a step five of adjusting the opening degree of the first and second distributing valves in a set adjustment manner according to the load current of the powder selector and the unit machine hour finished product yield.
9. The cement grinding method with the screw conveyor according to claim 8, wherein the set adjustment mode is to increase the opening degree when the load current of the powder selecting machine and the product yield per unit machine are lower than the corresponding threshold value range, adjust the second material distributing valve and then adjust the first material distributing valve, so as to alternately adjust the opening degree by 10% each time, observe the load current of the powder selecting machine and the product yield per unit machine after each adjustment until the load current and the product yield per unit machine are all within the threshold value range, and stop the adjustment.
10. The cement grinding method with screw conveyor according to claim 9, wherein the threshold range of the load current of the powder selector is 150-200A; the threshold range of the unit station yield is 210-230 tons.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311001880.XA CN116966996A (en) | 2023-08-09 | 2023-08-09 | Cement grinding system and method with screw conveyor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311001880.XA CN116966996A (en) | 2023-08-09 | 2023-08-09 | Cement grinding system and method with screw conveyor |
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| Publication Number | Publication Date |
|---|---|
| CN116966996A true CN116966996A (en) | 2023-10-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311001880.XA Pending CN116966996A (en) | 2023-08-09 | 2023-08-09 | Cement grinding system and method with screw conveyor |
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| Country | Link |
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| CN (1) | CN116966996A (en) |
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2023
- 2023-08-09 CN CN202311001880.XA patent/CN116966996A/en active Pending
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