CN112934449B - Online weighing anti-blocking mechanism for medium-speed grinding coal inlet pipe and control method - Google Patents
Online weighing anti-blocking mechanism for medium-speed grinding coal inlet pipe and control method Download PDFInfo
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- CN112934449B CN112934449B CN202110253355.1A CN202110253355A CN112934449B CN 112934449 B CN112934449 B CN 112934449B CN 202110253355 A CN202110253355 A CN 202110253355A CN 112934449 B CN112934449 B CN 112934449B
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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
- B02C25/00—Control arrangements specially adapted for crushing or disintegrating
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Abstract
The invention discloses an on-line weighing anti-blocking mechanism of a medium-speed mill coal feeding pipe and a control method thereof. The technical effects achieved are as follows: the invention provides a structure for monitoring the blockage of a coal inlet pipe of a vertical coal mill by heating and evaporating the lower part of the coal inlet pipe to form hard salt scale mixed with coal dust in real time, which can reduce or prevent the serious blockage of the coal inlet pipe of the vertical coal mill and improve the reliability of a medium-speed mill.
Description
Technical Field
The invention relates to the technical field of vertical coal mills in thermal power plants and the like, in particular to an on-line weighing and anti-blocking mechanism for a medium-speed coal inlet pipe, which is a simple device for preventing the coal inlet pipe of the vertical coal mill from being blocked, and also relates to a control method for the on-line weighing and anti-blocking mechanism for the medium-speed coal inlet pipe.
Background
At present, a plurality of domestic coal-fired thermal power plants adopt vertical medium-speed coal mills, in actual operation, coal inlet pipe blockage accidents frequently occur, and the main reasons are as follows:
1. the coal inlet pipe with higher water content on the surface of the coal entering the furnace in rainy season is blocked;
2. when the coal to be charged contains more "slime", the coal flow in the shape of "mud-rock flow" blocks the coal inlet pipe;
3. the coal inlet pipe of the coal mill is heated in the coal mill, and salt dissolved in water on the surface of the coal is heated and evaporated to form hard salt scale mixed with coal powder;
4. under the influence of rainy season, the on-site coal taking equipment digs most of moist silt when digging the bottom of the coal pile, so that the fluctuation of the surface water content of the coal is larger in different periods. The water on the surface of the coal entering the mill is high and uneven, so that the temperature fluctuation in the mill is large; when the temperature of the separation area rises, the temperature of the lower part of the coal inlet pipe is increased sharply, and salt dissolved in water on the surface of coal is in the lower part of the coal inlet pipe. In order to ensure the stable temperature of the outlet of the mill, the inlet hot air quantity must be increased to increase the inlet air temperature, so that the speed of forming hard salt scale mixed with coal dust by heating and evaporation is increased sharply.
Generally, the higher the temperature of the coal mill outlet gas-powder mixture, the more advantageous the drying process of the coal powder, but the temperature value cannot exceed the safety limit. If the outlet temperature is higher than a specified value, the high temperature drives volatile matters to escape from the coal, so that the potential danger of fuel ignition is increased; the outlet temperature is lower than the prescribed value, and the coal cannot be sufficiently dried to be adsorbed in the inside of the coal mill and the pulverized coal pipe. Blocking the coal powder pipe, and causing deflagration of the coal mill outlet and the coal powder pipe.
The design outlet temperature of the medium speed mill is generally 70-90 ℃. For high volatile coal, the temperature should be kept at 65-70 ℃; the temperature should not be higher than 90-95 ℃ for low volatile coal. The outlet low temperature of the coal mill should be 10 ℃ above the dew point, but not lower than 60 ℃ to avoid caking of the coal dust. Based on the oxygen content of the drying medium, the powder making system layout, raw coal volatile and mill roll limitations, the internal local temperature of the mill may instantaneously exceed 150 ℃ during operation.
The outlet temperature control of the coal mill is realized by adjusting the inlet air temperature of the coal mill. The inlet wind temperature depends on the heat balance condition of the coal mill, and is greatly influenced by the moisture of raw coal. On the basis of the air temperature of the primary air outlet of the air preheater, the primary air temperature entering the coal mill is regulated by changing the proportion of the cold air which is doped.
When the temperature of the coal inlet pipe is higher than the corresponding water vapor dew point temperature in operation, water on the surface of the coal is evaporated in the coal inlet pipe, and impurities such as salts dissolved in the water are adhered to the inner wall of the lower part of the coal inlet pipe to form salt scale while evaporating. The salt scale is accumulated in the inner surface of the coal inlet pipe in a variable attachment way, the accumulated salt scale is accumulated for a long time, so that the coal inlet pipe is reduced in the passing channel, and the coal inlet pipe is blocked in a short time when the salt scale is seriously used. Because the coal feeding measuring point cannot be found in the first time when the coal feeding machine is arranged, the blocked coal can be accumulated to the coal feeding machine, and the manual cleaning difficulty of the coal feeding pipeline is extremely high.
The slight blockage of the coal inlet pipe of the coal mill can cause the output reduction of the vertical medium-speed coal mill, and the load of a unit is affected; the serious blockage of the coal inlet pipe of the coal mill can cause the coal breakage of the vertical medium-speed coal mill, seriously affect the load of the unit and even cause the accident shutdown of the generator unit.
Disclosure of Invention
Therefore, the invention provides an on-line weighing anti-blocking mechanism for a medium-speed coal feeding pipe, which aims to solve the problems in the prior art.
In order to achieve the above object, the present invention provides the following technical solutions:
according to the first aspect of the invention, the on-line weighing anti-blocking mechanism for the medium-speed mill coal inlet pipe comprises a coal inlet pipe body, a pipeline flexible connection, a shell flexible connection, a weighing sensor support guide assembly, a weighing sensor and a coal inlet pipe support guide assembly, wherein the pipeline flexible connection is arranged in the middle of the coal inlet pipe body, the weighing sensor support guide assembly, the shell flexible connection and the coal inlet pipe support guide assembly are sequentially arranged at the lower part of the coal inlet pipe body, which is positioned on the pipeline flexible connection, and the upper end of the coal inlet pipe body is connected with a totally-enclosed coal hopper.
Further, the weighing sensor support guide assembly comprises a first guide groove and a first guide protrusion, the first guide protrusion is fixed on the outer side wall of the coal inlet pipe body, the first guide protrusion is slidably connected in the first guide groove, and the weighing sensor is arranged between the first guide protrusion and the first guide groove.
Further, the first guide groove comprises a first lower bottom plate, a first lower side plate, a first lower vertical plate and a first lower reinforcing rib, wherein the first lower bottom plate is horizontally arranged, the upper surface of the first lower bottom plate is vertically fixed with two first lower side plates arranged at intervals, the lower surface of the first lower bottom plate is vertically fixed with the first lower vertical plate, and the first lower reinforcing rib is arranged at the joint between the first lower vertical plate and the first lower bottom plate; the weighing sensor is arranged between the two first lower side plates, and the first guide protrusion is connected between the two first lower side plates in a sliding manner.
Further, the first guide protrusion comprises a first upper reinforcing rib and a first upper bottom plate, the first upper bottom plate is horizontally fixed on the outer side wall of the coal inlet pipe body, the first upper reinforcing rib is vertically fixed on the upper surface of the first upper bottom plate, the first upper bottom plate is slidably connected between the two first lower side plates, and the weighing sensor is located on the first upper bottom plate and the first lower bottom plate.
Further, the coal inlet pipe supporting and guiding assembly comprises a second guiding protrusion and a second guiding groove, the second guiding groove is fixed on the outer side wall of the coal inlet pipe body, and the second guiding protrusion is slidably connected in the second guiding groove.
Further, the second guide protrusion comprises a second lower vertical plate and a second lower side plate, the second lower vertical plate is vertically arranged, the second lower side plate is vertically fixed on the side face of the second lower vertical plate, and the second lower vertical plate is slidably connected in the second guide groove.
Further, the second guide groove comprises a second upper top plate and two second upper side plates, the second upper top plate is horizontally fixed on the outer side wall of the coal inlet pipe body, the two second upper side plates are vertically fixed on the lower surface of the second upper top plate at intervals, and the second lower vertical plate is connected between the two second upper side plates in a sliding mode.
According to a second aspect of the present invention, a control method of an on-line weighing and anti-blocking mechanism for a medium speed coal pipe, using the on-line weighing and anti-blocking mechanism for a medium speed coal pipe according to any one of the first aspect of the present invention, further comprises the steps of:
step S100, the initial installation stage is tested to obtain: the influence value M1 of the coal feeding quantity of the normal operation coal feeder on the integral weighing of the pipeline corresponds to a curve, the measured mass of the heavy pipeline is M, the M-M1 is the final weighing output value,
step 200, a medium speed mill operation starting automatic control logic,
step S300, comparing whether the data of the on-line weighing device of the actual medium-speed grinding coal inlet pipe has serious deviation or not according to the output working condition of the medium-speed grinding machine,
and step 400, comparing the load data of the medium-speed grinding coal feeding pipe on-line weighing device to continuously increase.
Further, the step S300 specifically further includes:
when the data deviation of the online weighing device of the medium-speed coal grinding pipe is serious, starting a blockage cleaning program and sending an automatic blockage cleaning instruction;
and when the data deviation of the on-line weighing device of the medium-speed grinding coal pipe is not serious, the device continues to operate after correction.
Further, step S400 specifically further includes:
when dynamic load data of an on-line weighing device of a coal pipe of a medium-speed mill in operation slowly and continuously increases to a specific value, starting a blockage cleaning program and sending an automatic blockage cleaning instruction;
when dynamic load data of an on-line weighing device of a coal pipe of a medium-speed mill in operation suddenly and rapidly increases, starting a blockage cleaning program and sending an automatic blockage cleaning instruction;
when the dynamic load data load of the on-line weighing device of the coal feeding pipe of the running medium speed mill suddenly and rapidly increases to a specific value, a blockage clearing program is started, and when the dynamic load continues to rapidly increase to the specific value after an automatic blockage clearing instruction is sent out, the control system automatically sends out an alarm and simultaneously sends out a shutdown medium speed mill instruction.
The invention has the following advantages: the invention provides a structure for reducing or preventing the blockage of a coal powder mixed hard salt scale formed by heating and evaporating the lower part of a coal inlet pipe of a vertical coal mill, which can reduce or prevent the blockage of the coal powder mixed hard salt scale formed by heating the coal inlet pipe of the vertical coal mill and improve the reliability of a medium-speed mill.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It will be apparent to those of ordinary skill in the art that the drawings in the following description are exemplary only and that other implementations can be obtained from the extensions of the drawings provided without inventive effort.
The structures, proportions, sizes, etc. shown in the present specification are shown only for the purposes of illustration and description, and are not intended to limit the scope of the invention, which is defined by the claims, so that any structural modifications, changes in proportions, or adjustments of sizes, which do not affect the efficacy or the achievement of the present invention, should fall within the ambit of the technical disclosure.
Fig. 1 is a cross-sectional view of an on-line weighing anti-blocking mechanism for a medium speed coal pipe according to some embodiments of the present invention.
Fig. 2 is a cross-sectional view of an on-line weighing anti-blocking mechanism for a medium speed coal pipe according to some embodiments of the present invention.
Fig. 3 is a partial enlarged view of a load cell support guide assembly of an on-line weighing anti-blocking mechanism for a medium speed coal pipe according to some embodiments of the present invention.
Fig. 4 is a top view of a first guide groove of an on-line weighing anti-blocking mechanism for a medium speed coal pipe according to some embodiments of the present invention.
Fig. 5 is a left side view of a first guide slot of an on-line weighing anti-blocking mechanism for a medium speed coal pipe according to some embodiments of the present invention.
Fig. 6 is a top view of a first guide protrusion of an on-line weighing anti-blocking mechanism for a medium speed coal pipe according to some embodiments of the present invention.
Fig. 7 is a left side view of a first guide protrusion of an on-line weighing anti-blocking mechanism for a medium speed coal pipe according to some embodiments of the present invention.
Fig. 8 is a partial enlarged view of a coal pipe support guide assembly of an on-line weighing anti-blocking mechanism for a medium speed mill coal pipe according to some embodiments of the present invention.
Fig. 9 is a top view of a second guide protrusion of an on-line weighing anti-blocking mechanism for a medium speed coal pipe according to some embodiments of the present invention.
Fig. 10 is a left side view of a second guide protrusion of an on-line weighing anti-blocking mechanism for a medium speed coal pipe according to some embodiments of the present invention.
Fig. 11 is a top view of a second guide slot of an on-line weighing anti-blocking mechanism for a medium speed coal pipe according to some embodiments of the present invention.
Fig. 12 is a left side view of a second guide slot of an on-line weighing anti-blocking mechanism for a medium speed coal pipe according to some embodiments of the present invention.
Fig. 13 is a partially enlarged view of a soft connection of a housing of an on-line weighing anti-blocking mechanism for a medium speed coal pipe according to some embodiments of the present invention.
In the figure: 1. the coal feeding pipe comprises a coal feeding pipe body, wherein the coal feeding pipe body is 2, a pipeline is flexibly connected, the shell is flexibly connected, the weighing sensor is 4, a supporting and guiding assembly of the weighing sensor is 41, a first guiding groove, 411, a first lower bottom plate, 412, a first lower side plate, 413, a first lower vertical plate, 414, a first lower reinforcing rib, 42, a first guiding bulge, 421, a first upper reinforcing rib, 422, a first upper bottom plate, 5, a supporting and guiding assembly of the coal feeding pipe, 51, a second guiding bulge, 511, a second lower vertical plate, 512, a second lower side plate, 52, a second guiding groove, 521, a second upper top plate, 522, a second upper side plate, 6 and a totally-enclosed coal dropping hopper.
Detailed Description
Other advantages and advantages of the present invention will become apparent to those skilled in the art from the following detailed description, which, by way of illustration, is to be read in connection with certain specific embodiments, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1 to 13, an on-line weighing anti-blocking mechanism for a medium speed grinding coal feeding pipe in an embodiment of the invention comprises a coal feeding pipe body 1, a pipeline flexible connection 2, a shell flexible connection 3, a weighing sensor support guide assembly 4, a weighing sensor and a coal feeding pipe support guide assembly 5, wherein the pipeline flexible connection 2 is installed in the middle of the coal feeding pipe body 1, the weighing sensor support guide assembly 4, the shell flexible connection 3 and the coal feeding pipe support guide assembly 5 are sequentially installed at the lower part of the coal feeding pipe body 1 positioned in the pipeline flexible connection 2, and the upper end of the coal feeding pipe body 1 is connected with a totally-enclosed coal dropping hopper 6.
In the above embodiments, it should be noted that the main technical problems solved by this embodiment are: when the coal inlet pipe is gradually blocked, the weight of the coal inlet pipe and the blocking coal in the pipe are monitored in real time; when the weight of the coal inlet pipe and the attached plugs in the coal inlet pipe reaches a certain set value (alarm value), the system gives an alarm, and an automatic plug cleaning device is automatically started; when the weight is continuously lower than the alarm value, the automatic blockage removing device is stopped after a delay of 5-50s (which can be set according to the actual working condition); when the weight of the coal inlet pipe and the blocking objects attached to the inside reaches a certain set value (serious blocking tripping value), the operation of the coal feeder is automatically stopped, and the blocking deterioration of the coal dropping condition is prevented; when the weight of the coal feeding pipe and the attached plugs in the coal feeding pipe is continuously increased without being reduced after the automatic blocking cleaning device is started, and the coal feeding pipe and the attached plugs are increased to a certain set value (automatic grinding stopping value), the system automatically sends out a command: (1) closing an original coal bin, and a plugboard door of a coal dropping pipe of the belt scale; (2) shut down the belt weighing feeder; (3) The automatic block clearing device is kept to operate (delay operation is 10-200 s). After the blockage alarm coal feeder is automatically stopped, the operator should make records to inform the related departments of making equipment maintenance and inspection.
In order to achieve the above object, the technical method adopted is as follows:
1. replacing or performing technical construction by using equipment in a maintenance period;
2. isolating and dismantling the original coal inlet pipe;
3. the structure of fig. 1 is installed after the disassembly, and the operations such as reconstruction and installation are performed.
The step 3 specifically comprises the following steps:
(1) The soft connection arranged at the upper part of the coal inlet pipe can be provided with the soft connection shown in the figures 1 and 2 or other soft connection forms capable of realizing the function, and the soft connection arranged at the upper part of the coal inlet pipe and the coal mill shell can also be realized in other soft connection forms;
(2) The weighing sensor support guide assembly 4 is installed, a weighing sensor support piece (the weighing sensor can be directly installed) is installed, the gap of the weighing sensor support guide assembly 4 is adjusted, the height of the gap is locked, the weighing sensor support guide assembly 4 realizes all weight support in the soft connection of the coal feeding pipe, and the coal feeding pipe can only move up and down, can not move back and forth and left and right and can not rotate;
(3) The coal inlet pipe supporting and guiding assembly 5 of 1 to 2 groups is installed, and other forms can be adopted to realize the function, and the function realized by the coal inlet pipe supporting and guiding assembly 5: the coal inlet pipe can only move up and down freely, and can move up and down, can not move back and forth and left and right and can not rotate when the coal inlet pipe supporting and guiding assembly 5 enters a specific area; each medium-speed coal inlet pipe is provided with 1 to 3 groups of coal inlet pipe supporting and guiding components 5 in a matched manner, each group of coal inlet pipe supporting and guiding components 5 consists of 2 to 4 groups of coal inlet pipe supporting and guiding components 5, and each coal inlet pipe is provided with 1 to 3 groups of coal inlet pipe supporting and guiding components 5;
(4) Load cells (2 to 4 pieces/group) were mounted: load cell support guide assembly 4 function: the weighing and supporting of static and dynamic loads of soft connection are realized.
The technical effects achieved by the embodiment are as follows: the embodiment provides a structure for reducing or preventing the blockage of the hard salt scale mixed with the coal powder formed by the heated evaporation of the lower part of the coal inlet pipe of the vertical coal mill, which can reduce or prevent the blockage of the hard salt scale mixed with the coal powder formed by the heated coal inlet pipe of the vertical coal mill, and improve the reliability of the medium-speed mill.
Alternatively, as shown in fig. 1 to 13, in some embodiments, the load cell support guide assembly 4 includes a first guide groove 41 and a first guide protrusion 42, the first guide protrusion 42 is fixed on the outer sidewall of the coal pipe body 1, the first guide protrusion 42 is slidably connected in the first guide groove 41, and a load cell is disposed between the first guide protrusion 42 and the first guide groove 41.
In the above alternative embodiment, it should be noted that the load cell supporting and guiding assembly 4 may also be other structures for installing a load cell, so as to ensure that the coal feeding pipe can only move up and down, but cannot move back and forth, and cannot rotate.
The beneficial effects of the above alternative embodiment are: through the concrete structure of the heavy sensor support guide assembly 4 of the embodiment, a good limiting effect is achieved, and the occurrence of left-right movement and rotation of the coal feeding pipe is avoided.
Alternatively, as shown in fig. 1 to 13, in some embodiments, the first guide groove 41 includes a first lower bottom plate 411, a first lower side plate 412, a first lower riser 413, and a first lower reinforcing rib 414, the first lower bottom plate 411 is horizontally disposed, two first lower side plates 412 disposed at intervals are vertically fixed to an upper surface of the first lower bottom plate 411, the first lower riser 413 is vertically fixed to a lower surface of the first lower bottom plate 411, and the first lower reinforcing rib 414 is disposed at a connection between the first lower riser 413 and the first lower bottom plate 411; the load cell is disposed between the two first lower side plates 412, and the first guide projection 42 is slidably connected between the two first lower side plates 412.
In the above alternative embodiment, it should be noted that the first guide groove 41 may have other structures.
The beneficial effects of the above alternative embodiment are: by the structure of the first guide groove 41 of the above embodiment, the processing cost is low and the use effect is good.
Alternatively, as shown in fig. 1 to 13, in some embodiments, the first guide protrusion 42 includes a first upper reinforcing rib 421 and a first upper bottom plate 422, the first upper bottom plate 422 is horizontally fixed to an outer sidewall of the coal pipe body 1, the first upper reinforcing rib 421 is vertically fixed to an upper surface of the first upper bottom plate 422, the first upper bottom plate 422 is slidably connected between the two first lower side plates 412, and the load cell is located between the first upper bottom plate 422 and the first lower bottom plate 411.
In the above alternative embodiments, it should be noted that the first guide projection 42 may have other configurations.
The beneficial effects of the above alternative embodiment are: by the structure of the first guide projection 42 of the above embodiment, the processing cost is low and the use effect is good.
Alternatively, as shown in fig. 1 to 13, in some embodiments, the coal pipe support guide assembly 5 includes a second guide protrusion 51 and a second guide groove 52, the second guide groove 52 being fixed on the outer sidewall of the coal pipe body 1, the second guide protrusion 51 being slidably coupled within the second guide groove 52.
In the above alternative embodiment, it should be noted that, in addition, the coal feeding pipe supporting and guiding assembly 5 may have other structures, so long as it can be used to ensure that the coal feeding pipe can only move up and down, cannot move back and forth, cannot move left and right, and cannot rotate.
The beneficial effects of the above alternative embodiment are: through the concrete structure of the coal inlet pipe supporting and guiding assembly 5 of the embodiment, a good limiting effect is achieved, and the occurrence of left-right movement and rotation of the coal inlet pipe is avoided.
Alternatively, as shown in fig. 1 to 13, in some embodiments, the second guide protrusion 51 includes a second lower riser 511 and a second lower side plate 512, the second lower riser 511 is vertically disposed, the second lower side plate 512 is vertically fixed to a side of the second lower riser 511, and the second lower riser 511 is slidably coupled in the second guide groove 52.
In the above alternative embodiment, it should be noted that the second guide projection 51 may have other configurations.
The beneficial effects of the above alternative embodiment are: by the structure of the second guide projection 51 of the above embodiment, the processing cost is low and the use effect is good.
Alternatively, as shown in fig. 1 to 13, in some embodiments, the second guide groove 52 includes a second upper top plate 521 and two second upper side plates 522, the second upper top plate 521 is horizontally fixed to the outer sidewall of the coal pipe body 1, the two second upper side plates 522 are vertically fixed to the lower surface of the second upper top plate 521 at a spaced apart relationship, and the second lower riser 511 is slidably connected between the two second upper side plates 522.
In the above alternative embodiment, it should be noted that the second guide groove 52 may have other structures.
The beneficial effects of the above alternative embodiment are: by the structure of the second guide groove 52 of the above embodiment, the processing cost is low and the use effect is good.
As shown in fig. 1 to 13, a control method of an on-line weighing and anti-blocking mechanism for a medium speed coal feeding pipe according to a second embodiment of the present invention, using an on-line weighing and anti-blocking mechanism for a medium speed coal feeding pipe according to any one of the embodiments of the first embodiment of the present invention, further includes the steps of: step S100, the initial installation stage is tested to obtain: and (3) the influence value M1 of the coal feeding quantity M (t/h) of the normal operation (without coal blockage) coal feeder on the integral weighing of the pipeline corresponds to a curve, the measured mass of the heavy pipeline is M, and then M-M1 is the final weighing output value, step S200 is that the medium-speed mill is put into operation and starts automatic control logic, step S300 is that the output working condition of the corresponding medium-speed mill is compared with whether the data of the on-line weighing device of the actual medium-speed coal feeding pipe has serious deviation, and step S400 is that the load data of the on-line weighing device of the medium-speed coal feeding pipe is continuously increased.
Optionally, as shown in fig. 1 to 13, in some embodiments, step S300 specifically further includes: when the data deviation of the online weighing device of the medium-speed grinding coal pipe is serious (percentage, weighing data), starting a blockage cleaning program and sending an automatic blockage cleaning instruction; and when the data deviation of the on-line weighing device of the medium-speed grinding coal pipe is not serious, the device continues to operate after correction.
Optionally, as shown in fig. 1 to 13, in some embodiments, step S400 specifically further includes: when dynamic load data of an on-line weighing device of a coal pipe with a medium-speed mill in operation slowly and continuously increases to a specific value (percentage, weighing data), starting a blockage cleaning program and sending an automatic blockage cleaning instruction; when dynamic load data of an on-line weighing device of a coal pipe of a medium-speed mill in operation suddenly and rapidly increases, starting a blockage cleaning program and sending an automatic blockage cleaning instruction; when the dynamic load data load of the on-line weighing device of the coal feeding pipe of the medium speed mill in operation suddenly and rapidly increases to a specific value (percentage, weighing data), a blockage clearing program is started, and after an automatic blockage clearing instruction is sent, the dynamic load continues to rapidly increase to the specific value (percentage, weighing data), and the control system automatically sends out an alarm and simultaneously sends out a shutdown medium speed mill instruction.
In the above alternative embodiment, it should be noted that the coal bunker and the belt scale coal drop pipe gate valve are closed; after the coal bin and the coal dropping pipe gate valve of the belt scale are closed, the belt scale coal feeder is stopped after time delay (5-10 s); after the automatic blockage clearing instruction is sent out, the data of the on-line weighing and blockage preventing mechanism of the medium-speed mill coal inlet pipe is delayed (10-150 s) and is not obviously reduced, and the medium-speed mill is stopped for connection maintenance; after an automatic blockage clearing instruction is sent, the data of the on-line weighing and blockage preventing mechanism of the medium-speed coal inlet pipe suddenly drops, and the automatic blockage clearing operation is kept; after an automatic blockage clearing instruction is sent out, the data of the medium-speed grinding coal feeding pipe on-line weighing anti-blocking mechanism suddenly descends or descends in a stepwise manner, so that the automatic blockage clearing operation is kept; and when the data of the on-line weighing anti-blocking mechanism of the medium-speed coal feeding pipe is reduced to be close to the static load data of the on-line weighing anti-blocking mechanism of the medium-speed coal feeding pipe, the system alarms, and an operator is informed to restart the medium-speed mill.
The beneficial effects of the above alternative embodiment are: by the control method of the embodiment, the blockage of the coal inlet pipe of the vertical coal mill due to the heated hard salt scale mixed with the coal dust is reduced or avoided, and the reliability of the medium-speed mill is improved.
While the invention has been described in detail in the foregoing general description and specific examples, it will be apparent to those skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the invention and are intended to be within the scope of the invention as claimed.
The terms such as "upper", "lower", "left", "right", "middle" and the like are also used in the present specification for convenience of description, but are not intended to limit the scope of the present invention, and the changes or modifications of the relative relationship thereof are considered to be within the scope of the present invention without substantial modification of the technical content.
Claims (7)
1. The utility model provides a medium speed grinds coal pipe on-line weighing anti-blocking mechanism, its characterized in that, including advance coal pipe body (1), pipeline flexible coupling (2), casing flexible coupling (3), weighing sensor support direction subassembly (4), weighing sensor and advance coal pipe support direction subassembly (5), advance the mid-mounting of coal pipe body (1) have pipeline flexible coupling (2) advance coal pipe body (1) be located the lower part of pipeline flexible coupling (2) is installed in proper order weighing sensor support direction subassembly (4), casing flexible coupling (3) and advance coal pipe support direction subassembly (5), advance the upper end of coal pipe body (1) and be connected with totally closed coal hopper (6); the weighing sensor supporting and guiding assembly (4) comprises a first guiding groove (41) and a first guiding protrusion (42), the first guiding protrusion (42) is fixed on the outer side wall of the coal feeding pipe body (1), the first guiding protrusion (42) is slidably connected in the first guiding groove (41), and the weighing sensor is arranged between the first guiding protrusion (42) and the first guiding groove (41); the coal feeding pipe supporting and guiding assembly (5) comprises a second guiding protrusion (51) and a second guiding groove (52), the second guiding groove (52) is fixed on the outer side wall of the coal feeding pipe body (1), and the second guiding protrusion (51) is slidably connected in the second guiding groove (52).
2. The medium speed coal pipe on-line weighing and anti-blocking mechanism according to claim 1, wherein the first guide groove (41) comprises a first lower bottom plate (411), a first lower side plate (412), a first lower vertical plate (413) and a first lower reinforcing rib (414), the first lower bottom plate (411) is horizontally arranged, two first lower side plates (412) which are arranged at intervals are vertically fixed on the upper surface of the first lower bottom plate (411), the first lower vertical plate (413) is vertically fixed on the lower surface of the first lower bottom plate (411), and the first lower reinforcing rib (414) is arranged at the joint between the first lower vertical plate (413) and the first lower bottom plate (411); the load cell is arranged between the two first lower side plates (412), and the first guide protrusion (42) is slidably connected between the two first lower side plates (412).
3. The on-line weighing and anti-blocking mechanism for a medium speed mill coal feeding pipe according to claim 2, wherein the first guide protrusion (42) comprises a first upper reinforcing rib (421) and a first upper bottom plate (422), the first upper bottom plate (422) is horizontally fixed on the outer side wall of the coal feeding pipe body (1), the first upper reinforcing rib (421) is vertically fixed on the upper surface of the first upper bottom plate (422), the first upper bottom plate (422) is slidably connected between the two first lower side plates (412), and the weighing sensor is located between the first upper bottom plate (422) and the first lower bottom plate (411).
4. The on-line weighing and anti-blocking mechanism for medium speed coal grinding pipes according to claim 1, wherein the second guide protrusion (51) comprises a second lower vertical plate (511) and a second lower side plate (512), the second lower vertical plate (511) is vertically arranged, the second lower side plate (512) is vertically fixed on the side surface of the second lower vertical plate (511), and the second lower vertical plate (511) is slidably connected in the second guide groove (52).
5. The on-line weighing and anti-blocking mechanism for a medium speed coal feeding pipe according to claim 4, wherein the second guide groove (52) comprises a second upper top plate (521) and two second upper side plates (522), the second upper top plate (521) is horizontally fixed on the outer side wall of the coal feeding pipe body (1), the two second upper side plates (522) are vertically fixed on the lower surface of the second upper top plate (521) at intervals, and the second lower vertical plate (511) is slidably connected between the two second upper side plates (522).
6. A control method of an on-line weighing and anti-blocking mechanism for a medium-speed coal-feeding pipe, which is characterized by using the on-line weighing and anti-blocking mechanism for the medium-speed coal-feeding pipe according to any one of claims 1 to 5, and further comprising the following steps:
step S100, the initial installation stage is tested to obtain: the influence value M1 of the coal feeding quantity of the normal operation coal feeder on the integral weighing of the pipeline corresponds to a curve, and the measured mass of the heavy pipeline is M, so that M-M1 is a final weighing output value;
step S200, a medium-speed mill operation starting automatic control logic;
step S300, comparing whether the data of the on-line weighing device of the actual medium-speed grinding coal inlet pipe has serious deviation or not according to the output working condition of the medium-speed grinding machine;
step S400, comparing load data of the medium-speed grinding coal feeding pipe on-line weighing device to continuously increase;
the step S300 specifically further includes:
when the data deviation of the online weighing device of the medium-speed coal grinding pipe is serious, starting a blockage cleaning program and sending an automatic blockage cleaning instruction;
and when the data deviation of the on-line weighing device of the medium-speed grinding coal pipe is not serious, the device continues to operate after correction.
7. The method for controlling an on-line weighing and anti-blocking mechanism for a medium-speed coal feeding pipe according to claim 6, wherein step S400 specifically further comprises:
when dynamic load data of an on-line weighing device of a coal pipe of a medium-speed mill in operation slowly and continuously increases to a specific value, starting a blockage cleaning program and sending an automatic blockage cleaning instruction;
when dynamic load data of an on-line weighing device of a coal pipe of a medium-speed mill in operation suddenly and rapidly increases, starting a blockage cleaning program and sending an automatic blockage cleaning instruction;
when the dynamic load data load of the on-line weighing device of the coal feeding pipe of the running medium speed mill suddenly and rapidly increases to a specific value, a blockage clearing program is started, and when the dynamic load continues to rapidly increase to the specific value after an automatic blockage clearing instruction is sent out, the control system automatically sends out an alarm and simultaneously sends out a shutdown medium speed mill instruction.
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