CN111533474A - Ash return control device and control method for cement production line - Google Patents
Ash return control device and control method for cement production line Download PDFInfo
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- CN111533474A CN111533474A CN202010564638.3A CN202010564638A CN111533474A CN 111533474 A CN111533474 A CN 111533474A CN 202010564638 A CN202010564638 A CN 202010564638A CN 111533474 A CN111533474 A CN 111533474A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/361—Condition or time responsive control in hydraulic cement manufacturing processes
- C04B7/362—Condition or time responsive control in hydraulic cement manufacturing processes for raw materials handling, e.g. during the grinding or mixing step
Abstract
The invention discloses a return ash control device and a control method for a cement production line, which comprises a kiln tail boiler, a warehousing elevator and a raw material homogenizing warehouse; a first ash returning zipper machine is arranged below an outlet pipeline of the kiln tail boiler, the output end of the first ash returning zipper machine is connected with a three-way valve, one outlet of the three-way valve is connected to an ash returning transfer bin, the other outlet of the three-way valve is connected to a second ash returning zipper machine, one end of the second ash returning zipper machine is connected to the warehousing elevator, and the warehousing elevator is connected with the raw material homogenizing warehouse; a conveying reamer is arranged between the discharge hole of the ash returning transfer bin and the second ash returning zipper machine; one side of the outlet pipeline of the kiln tail boiler is also connected with a boiler ash return hopper; when the raw material grinding system is stopped, the return ash of the kiln tail boiler does not influence the kiln, thereby ensuring the normal operation of the working condition of the kiln and avoiding the problems of poor yield and over standard clinker quality caused by poor kiln working condition; the output of the kiln clinker is improved and the loss of energy consumption is reduced.
Description
Technical Field
The invention relates to the technical field of cement clinker production, in particular to a dust return control device and a control method for a cement production line.
Background
The cement clinker is prepared with limestone, clay and iron material as main material and through mixing in proper proportion to form raw material, burning to melt partially or completely and cooling to obtain semi-finished product. In the cement industry, the most commonly used portland cement clinker has the major chemical components calcium oxide, silica and minor amounts of alumina and iron oxide. The main minerals are tricalcium silicate, dicalcium silicate, tricalcium aluminate and tetracalcium aluminoferrite. Kiln-tail boilers, such as SP boilers, are commonly used in cement production processes.
The return ash of the kiln tail boiler (hereinafter referred to as kiln ash) is powder collected by dust collecting equipment such as a humidifying tower, a dust collector and an SP furnace, wherein the dust is discharged along with kiln tail flue gas in the sintering process of cement clinker. The chemical components of the kiln dust are greatly different from those of the raw materials. When the kiln dust is reincorporated back into the kiln system, fluctuations in the raw meal feed amount and chemical properties are caused. The influence is particularly obvious when the raw material mill is stopped. And a method for discharging kiln dust is adopted by some enterprises to solve the problem.
The utility model discloses a raw meal grinds back ash collecting system as chinese utility model patent (publication number: CN208700130U) in 2019, including the chute that gathers that is used for carrying power generation boiler back ash and kiln tail back ash, gather the chute lower extreme and be connected with the warehouse entry lifting machine of homogenization storehouse, the homogenization storehouse top is provided with the fan that gathers dust, still includes back ash bin, and power generation boiler back ash passes through the depiler valve and is connected with the chute that gathers and lead to the transportation swift current I that returns the ash bin respectively, kiln tail back ash is carried through the back ash bucket of bucket elevator and is connected with back ash bin, it is connected with gathering the chute through returning the ash lifting machine to return the ash bin discharge gate. The utility model discloses a can stop grinding and non-stop grinding period provide different return ash and collect the route, but the return ash of these collections can not all drop into the raw meal homogenization storehouse again, have extravagant phenomenon. And when the storage and the buffering of returned ash are lacked, the recovery efficiency is limited.
In addition, as the raw material grinding is stopped, no raw material enters the raw material homogenizing warehouse, only the return ash of the kiln tail boiler returns to the raw material homogenizing warehouse, the return ash of the boiler is mixed with the raw material again and enters the kiln system for calcining, the return ash proportion is increased, the quality of the raw material entering the kiln is deteriorated, the components are unstable, and the calcining stability of the kiln system is damaged, so that the working condition of the kiln is deteriorated, and the quality of the calcined clinker exceeds the standard.
Disclosure of Invention
The invention aims to provide a dust return control device and a control method for a cement production line, aiming at the problems in the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that:
an ash return control device for a cement production line comprises a kiln tail boiler, a warehousing elevator and a raw material homogenizing warehouse; a first ash returning zipper machine is arranged below an outlet pipeline of the kiln tail boiler, the output end of the first ash returning zipper machine is connected with a three-way valve, one outlet of the three-way valve is connected to an ash returning transfer bin, the other outlet of the three-way valve is connected to a second ash returning zipper machine, one end of the second ash returning zipper machine is connected to the warehousing elevator, and the warehousing elevator is connected with the raw material homogenizing warehouse;
a conveying reamer is arranged between a discharge hole of the ash returning transfer bin and the second ash returning zipper machine, and a scaling removing device and a caking crushing device are also arranged in the ash returning transfer bin; boiler return ash stored in the return ash transfer bin falls onto the conveying reamer through the discharge hole after being dispersed and crushed and is conveyed to the second return ash zipper machine;
one side of an outlet pipeline of the kiln tail boiler is also connected with a boiler ash return hopper, the other side of the boiler ash return hopper is connected with a high-temperature fan, and the high-temperature fan pumps and circulates high-temperature gas in the kiln tail boiler; and an ash outlet of the boiler ash returning hopper corresponds to the first ash returning zipper machine.
According to the ash returning control device for the cement production line, the three-way valve is arranged and connected with the ash returning transfer bin and the conveying reamer below the ash returning transfer bin, so that when raw material grinding is stopped, the ash returning of the kiln tail boiler can be stored in the ash returning transfer bin, the ash returning in the stopping process is prevented from influencing the calcining process of a kiln system, the process change is avoided, and the influence on the kiln system is reduced; the method can accurately control the ash return ratio, ensure the stability of the kiln system calcination and ensure that the quality of the calcined clinker meets the standard requirement.
By adopting the ash return control device, the boiler ash return stored in the ash return transfer bin does not need to be discharged outside in the process of stopping raw material grinding, and when the system returns to normal operation, the boiler ash return stored in the ash return transfer bin can be conveyed to the raw material homogenizing silo along with other boiler ash returns, so that waste is avoided.
The descaling device and the caking crushing device arranged in the ash returning transfer bin can prevent the boiler from returning ash to be caked and scaled in the ash returning transfer bin, and the discharged boiler returns ash to be in a powder state, so that the influence on the subsequent process is reduced.
On one hand, the arrangement of the boiler ash return hopper can reduce the ash return accumulation at the outlet pipeline of the kiln tail boiler; on the other hand, the effect that the returned ash enters a high-temperature fan along with airflow and then enters a rear conveying system to finally enter a raw material homogenizing warehouse can be reduced, and the influence of the returned ash on a gas pumping and exhausting system is reduced; and the collected boiler ash return can fall into the first ash return zipper machine for conveying along with the main stream, so that the ash return collection effect is improved.
Further, the ash returning transfer bin is provided with a cylindrical storage part and a truncated cone-shaped discharging part; a vertical rotating shaft is arranged in the ash returning transfer bin, the end part of the vertical rotating shaft extends into the truncated cone-shaped discharging part, a plurality of horizontal rods are arranged on the outer circumference of the vertical rotating shaft in a vertically staggered manner, and an inclined rod is connected to the end part close to the vertical rotating shaft; the end parts of the horizontal rod and the inclined rod are respectively connected with a scraper and bristles through mounting plates, the bristles are positioned behind the scraper in the rotating direction, and the end parts of the scraper and the bristles are respectively abutted against the inner wall of the ash returning transit bin; the other end of vertical rotation axis is connected with first rotating electrical machines, first rotating electrical machines install return on grey top or the mounting bracket in transit bin.
When the descaling is needed, the first rotating motor is opened, the first rotating motor drives the vertical rotating shaft to rotate, so that the horizontal rod and the inclined rod are driven to rotate along the inner wall of the ash returning transfer bin, the scraper blade can scrape or shovel the accumulated and scaled boiler return ash on the inner wall in a rotating process, the bristles behind the scraper blade can be cleaned, the inner wall is cleaned, the adhesion of the boiler return ash is reduced, the accumulation and the agglomeration are reduced, and the boiler return ash is conveniently stored again.
Furthermore, the scraper blade is arc-shaped, the end part of the scraper blade is provided with a scraping part arranged at an inclined angle, and the length of the bristles is greater than that of the scraper blade; and a fluid changing body is arranged right below an inlet of the ash returning transfer bin, and the fluid changing body is staggered with the vertical rotating shaft and the horizontal rod.
The scraping part is convenient for scraping the returned ash attached to the arc-shaped inner wall; the flow changing body can change the flow direction of return ash added into the return ash transfer bin, so that accumulation is avoided, and the return ash is uniformly dispersed.
Furthermore, the position of the ash returning transfer bin close to the discharge port is provided with a caking crushing device, the caking crushing device comprises a pair of crushing shafts which are opposite in rotation direction, the crushing shafts stretch over the upper part of the discharge port of the ash returning transfer bin, the crushing shafts are provided with meshed crushing teeth, and the inner part of the ash returning transfer bin corresponds to the crushing shafts and is also provided with matched crushing teeth.
Furthermore, one end of the crushing shaft is connected with a second rotating motor, and the second rotating motor is installed on the outer wall of the ash returning transfer bin through a motor base; one ends of the crushing shafts, which are far away from the second rotating motor, are connected through a steering gear set.
The ash returning transfer bin is started when discharging, the second rotating motor is started, the crushing shafts rotate oppositely, and the crushing teeth on the crushing shafts can crush the agglomerated boiler return ash so that the discharged boiler return ash is dispersed powder, and subsequent production and processing are facilitated.
The arrangement of a plurality of motors is avoided by using the steering gear set; setting crushing shafts with different sizes according to the size of the spatial position near the discharge port; the number of crushing shafts is not limited to one pair, and a plurality of crushing shafts may be spatially stacked.
Further, an insulating layer is arranged on the outer wall of the ash returning transfer bin, and an electric heating layer is arranged between the insulating layer and the outer wall of the ash returning transfer bin; the electric heating layer is an electric heating wire wound on the outer wall of the ash returning transit bin.
The arrangement of the heat-insulating layer can maintain the ash returning temperature in the ash returning transfer bin, so as to avoid overcooling; electric heating wire can be when needing do return ash transfer storehouse heating, the inside boiler of drying returns the ash, reduces moisture, avoids the caking.
Further, an opening is formed in the horizontal section of the outlet pipeline of the kiln tail boiler, and the opening is connected with the boiler ash return hopper; the inner wall and the top of the boiler ash return hopper are provided with a plurality of vertical baffles, and the vertical baffles form an airflow maze.
A plurality of the setting of erecting the baffle for the striking is in when the boiler returns the ash and flows along with the air current on erecting the baffle, can make the boiler return the ash and drop, and the flow and the striking of multilayer buckling can stop most return the ash and be in the ash hopper is returned to the boiler, so that reuse.
Furthermore, a heavy hammer turnover plate air lock valve is arranged at an ash outlet of the boiler ash return hopper. When the boiler returns ash and accumulates certain weight, the boiler returns ash and can automatically open the ash outlet, so that the boiler returns ash and falls into the first ash returning zipper machine for conveying.
Further, a control method comprising the ash returning control device for the cement production line comprises the following steps: boiler return ash is normally collected by a boiler return ash hopper at the outlet pipeline of the kiln tail boiler, and falls into a first return ash zipper machine through the outlet pipeline of the kiln tail boiler and the boiler return ash hopper respectively;
when the cement production line is in normal production, the three-way valve is communicated with the second ash returning zipper machine and closes a channel connected with the ash returning transfer bin; the boiler ash returning on the first ash returning zipper machine sequentially passes through the three-way valve, the second ash returning zipper machine and the warehousing elevator to reach the raw material homogenizing warehouse;
when a raw material grinding system of a cement production line stops, the three-way valve closes a channel connected with the second ash returning zipper machine and a channel communicated with the ash returning transfer bin; the boiler return ash on the first ash return zipper machine directly enters the ash return transfer bin for storage through the three-way valve;
when the raw material grinding system is normally started, the three-way valve is communicated with the second ash returning zipper machine and closes a channel connected with the ash returning transfer bin; and when the boiler return ash on the first ash return zipper machine sequentially passes through the three-way valve, the second ash return zipper machine and the warehousing elevator to reach the raw material homogenizing warehouse, the boiler return ash stored in the return ash transfer bin reaches the raw material homogenizing warehouse through the conveying reamer, the second ash return zipper machine and the warehousing elevator.
By the control method, when the raw material grinding system is stopped, the return ash of the kiln tail boiler does not influence the kiln, so that the normal operation of the working condition of the kiln is ensured, and the problems of poor yield and over-standard clinker quality caused by poor kiln working condition are avoided; the output of the kiln clinker is improved and the loss of energy consumption is reduced.
Further, the control method further comprises the following control steps: the ash returning transfer bin is used for carrying out heat preservation treatment on the returned boiler ash stored in the ash returning transfer bin; the ash returning transfer bin regularly stirs the boiler ash returning inside and scrapes scales on the inner wall of the ash returning transfer bin; and the ash returning transfer bin is used for crushing the agglomerated boiler return ash in the discharging process and then discharging the crushed boiler return ash.
Compared with the prior art, the invention has the beneficial effects that: 1. according to the ash return control device for the cement production line, the three-way valve is arranged and connected with the ash return transfer bin and the conveying reamer below the ash return transfer bin, so that the ash return of a kiln tail boiler can be stored in the ash return transfer bin when raw material grinding is stopped, and the ash return is prevented from directly entering a raw material homogenizing warehouse; 2. according to the control method, when the raw material grinding system is stopped, the return ash of the kiln tail boiler does not influence the kiln, so that the normal operation of the working condition of the kiln is ensured, and the problems of poor yield and over-standard clinker quality caused by poor kiln working condition are avoided; the output of the kiln clinker is improved and the loss of energy consumption is reduced; 3. the scale removing device and the caking crushing device arranged in the ash returning transfer bin can prevent the returned boiler ash from caking and scaling in the ash returning transfer bin, and the discharged returned boiler ash is in a powder state, so that the influence on the subsequent process is reduced; 4. on one hand, the arrangement of the boiler ash return hopper can reduce the ash return accumulation at the outlet pipeline of the kiln tail boiler; on the other hand, the effect that the returned ash enters a high-temperature fan along with airflow and then enters a rear conveying system to finally enter a raw material homogenizing warehouse can be reduced, and the influence of the returned ash on a gas pumping and exhausting system is reduced; and the collected boiler ash return can fall into the first ash return zipper machine for conveying along with the main stream, so that the ash return collection effect is improved.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a dust return control device for a cement production line according to the present invention;
FIG. 2 is a schematic structural diagram of a return ash transfer bin of a return ash control device for a cement production line according to the present invention;
FIG. 3 is a schematic structural view of the scraping plates and bristles of the ash returning transit bin of the invention;
FIG. 4 is a schematic cross-sectional view taken at C-C of FIG. 3;
FIG. 5 is a schematic cross-sectional view taken along line A-A of FIG. 2;
FIG. 6 is a schematic view of the installation of the ash returning transfer bin of the ash returning control device for the cement production line;
FIG. 7 is a schematic cross-sectional view taken along line B-B of FIG. 2;
FIG. 8 is a schematic diagram showing the internal structure of a boiler ash returning hopper of the ash returning control device for a cement production line according to the present invention;
in the figure: 1. a kiln tail boiler; 2. a boiler ash return hopper; 201. an air inlet; 202. an air outlet; 203. a vertical baffle plate; 3. a heavy hammer turning plate airlock valve; 4. a high temperature fan; 5. a first ash-returning zipper machine; 6. a three-way valve; 7. returning ash to a transfer bin; 701. a heat-insulating layer; 702. a heating layer; 8. conveying the reamer; 9. a second ash-returning zipper machine; 10. warehousing a hoister; 11. a raw material homogenizing warehouse; 12. a vertical rotating shaft; 13. a horizontal bar; 14. mounting a plate; 15. a squeegee; 1501. a bending section; 1502. a scraping part; 16. brushing; 17. a diagonal bar; 18. a first rotating electrical machine; 19. changing the fluid; 20. a caking crushing device; 2001. a crushing shaft; 2002. crushing teeth; 2003. a second rotating electrical machine; 2004. a motor mounting seat; 2005. a steering gear set; 21. a support frame; 22. a cross member.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "middle", "upper", "lower", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The first embodiment is as follows:
as shown in fig. 1, an ash return control device for a cement production line comprises a kiln tail boiler 1, a warehousing elevator 10 and a raw material homogenizing warehouse 11; a first ash returning zipper machine 5 is arranged below an outlet pipeline of the kiln tail boiler 1, the output end of the first ash returning zipper machine 5 is connected with a three-way valve 6, one outlet of the three-way valve 6 is connected to an ash returning transfer bin 7, the other outlet of the three-way valve 6 is connected to a second ash returning zipper machine 9, one end of the second ash returning zipper machine 9 is connected to the warehousing elevator 10, and the warehousing elevator 10 is connected with the raw material homogenizing warehouse 11;
a conveying reamer 8 is arranged between a discharge hole of the ash returning transfer bin 7 and the second ash returning zipper machine 9, and a scaling removal device and a caking crushing device are also arranged in the ash returning transfer bin 7; boiler return ash stored in the return ash transfer bin 7 is scattered and crushed, falls onto the conveying reamer 8 through the discharge hole and is conveyed to the second return ash zipper machine 9;
one side of an outlet pipeline of the kiln tail boiler 1 is also connected with a boiler ash return hopper 2, the other side of the boiler ash return hopper 2 is connected with a high-temperature fan 4, and the high-temperature fan 4 pumps and circulates high-temperature gas in the kiln tail boiler 1; and an ash outlet of the boiler ash returning hopper 2 corresponds to the first ash returning zipper machine 5.
The ash return control device for the cement production line has reasonable arrangement of all parts, is easy to transform and arrange on site and has clear conveying logic; by arranging the three-way valve 6 and connecting the ash returning transfer bin 7 and the conveying reamer 8 below the ash returning transfer bin, when raw material grinding is stopped, the ash returning of the kiln tail boiler 1 can be stored in the ash returning transfer bin 7, the influence of the ash returning on a kiln system calcination process in the stopping process is avoided, the process change is avoided, and the influence on the kiln system is reduced; the method can accurately control the ash return ratio, ensure the stability of the kiln system calcination and ensure that the quality of the calcined clinker meets the standard requirement.
By adopting the ash return control device, the boiler ash return stored in the ash return transfer bin 7 does not need to be discharged outside in the process of stopping raw material grinding, and when the system returns to normal operation, the boiler ash return stored in the ash return transfer bin 7 can be conveyed to a raw material homogenization warehouse along with other boiler ash returns, so that waste is avoided.
The descaling device and the caking crushing device arranged in the ash returning transfer bin 7 can prevent the boiler from returning ash to be caked and scaled in the ash returning transfer bin 7, and the discharged boiler returns ash to be in a powder state, so that the influence on the subsequent process is reduced.
On one hand, the arrangement of the boiler ash return hopper 2 can reduce the ash return accumulation at the outlet pipeline of the kiln tail boiler 1; on the other hand, the effect that the returned ash enters a high-temperature fan along with airflow and then enters a rear conveying system to finally enter a raw material homogenizing warehouse can be reduced, and the influence of the returned ash on a gas pumping and exhausting system is reduced; and the collected boiler ash return can fall into the first ash return zipper machine 5 for conveying along with the main stream, so that the ash return collection effect is improved.
Furthermore, a heavy hammer turnover plate air lock valve 3 is arranged at an ash outlet of the boiler ash return hopper 2. When the boiler ash returns and accumulates to a certain weight, the boiler ash return can automatically open the ash outlet of the boiler ash return, so that the boiler ash return falls onto the first ash return zipper machine 5 for conveying; when the accumulated amount of the return ash of the boiler is not enough, the heavy hammer turning plate airlock valve 3 is closed, and the functions of supporting and preventing air leakage can be achieved.
Example two:
the embodiment provides a control method of the ash returning control device in the first embodiment.
As shown in fig. 1, the control method includes the following steps: the boiler ash return hopper 2 at the outlet pipeline of the kiln tail boiler 1 is used for normally collecting boiler ash return, and the boiler ash return falls into a first ash return zipper 5 through the outlet pipeline of the kiln tail boiler 1 and the boiler ash return hopper 2 respectively; the part is not influenced by the shutdown of the raw meal grinding system and can always maintain the normal working state;
when the cement production line is in normal production (the raw material grinding system is not stopped), the three-way valve 6 is communicated with the second ash returning zipper machine 9 and closes a channel connected with the ash returning transfer bin 7; the boiler ash on the first ash returning zipper machine 5 sequentially passes through the three-way valve 6, the second ash returning zipper machine 9 and the warehousing elevator 10 to reach the raw material homogenizing warehouse 11; this process may not use the ash return surge bin 7;
when a raw material grinding system of a cement production line stops, the three-way valve 6 closes a channel connected with the second ash returning zipper machine 9 and a channel communicated with the ash returning transfer bin 7; the boiler return ash on the first ash return zipper machine 5 directly enters the return ash transfer bin 7 through the three-way valve 6 for storage;
when the raw material grinding system is normally started again, the three-way valve 6 is communicated with the second ash returning zipper machine 9 and closes a channel connected with the ash returning transfer bin 7; while the boiler return ash on the first return ash zipper machine 5 sequentially passes through the three-way valve 6, the second return ash zipper machine 9 and the warehousing elevator 10 to reach the raw material homogenizing warehouse, the boiler return ash stored in the return ash transfer bin 7 is also converged onto the second return ash zipper machine 9 through the conveying reamer 8 and is conveyed to the warehousing elevator 10 along with the main stream and then reaches the raw material homogenizing warehouse 11; the second ash returning zipper machine 9 can have three conveying modes in the actual operation process under the step: the ash return device does not contain the boiler return ash in the ash return transfer bin 7, simultaneously contains the boiler return ash in the ash return transfer bin 7, and only contains the boiler return ash in the ash return transfer bin 7.
By the control method, when the raw material grinding system is stopped, the return ash of the kiln tail boiler 1 does not influence the kiln, so that the normal operation of the working condition of the kiln is ensured, and the problems of poor yield and over-standard clinker quality caused by poor kiln working condition are avoided; the output of the kiln clinker is improved and the loss of energy consumption is reduced.
Further, the control method further comprises the following control steps: the ash returning transfer bin 7 is used for carrying out heat preservation treatment on the returned ash of the boiler stored in the interior; the ash returning transfer bin 7 regularly stirs the returned ash of the boiler inside and scrapes off scales on the inner wall of the ash returning transfer bin; and the ash returning transfer bin 7 is used for crushing the agglomerated boiler return ash in the discharging process and then discharging the crushed boiler return ash. To ensure the quality of the stored boiler return ash.
Example three:
this embodiment provides the structure of the scale removal device in the ash return transfer bin in the first embodiment.
Specifically, as shown in fig. 2 to 6, the ash returning transfer bin 7 is provided with a cylindrical storage part and a truncated cone-shaped discharge part; a vertical rotating shaft 12 is arranged in the ash returning transfer bin 7, the end part of the vertical rotating shaft 12 extends into the truncated cone-shaped discharging part, a plurality of horizontal rods 13 are arranged on the outer circumference of the vertical rotating shaft 12 in a vertically staggered manner, an inclined rod 17 is connected to the end part close to the vertical rotating shaft 12, and the inclined rod 17 is positioned in the truncated cone-shaped discharging part; the ends of the horizontal rod 13 and the inclined rod 17 are respectively connected with a scraper 15 and bristles 16 through a mounting plate 14, the bristles 16 are positioned behind the scraper 15 in the rotation direction, and the ends of the scraper 15 and the bristles 16 are respectively abutted against the inner wall of the ash returning transit bin 7; the other end of the vertical rotating shaft 12 is connected with a first rotating motor 18, and the first rotating motor 18 is installed on a cross beam 22 of a support frame 21 of the ash returning transit bin 7.
When needing the scale removal, for example after a period of time operation and when return ash storage in the ash transfer bin 7 is gone on when not much, open first rotating electrical machines 18, first rotating electrical machines 18 drive vertical rotating shaft 12 is rotatory, thereby drives horizontal pole 13 with down tube 17 follows return ash transfer bin 7's inner wall rotates, at the pivoted in-process, scraper blade 15 can be scraped or shoveled the boiler ash that piles up and scale deposit on the inner wall back, follows closely brush hair 16 behind scraper blade 15 can clean up the inner wall, and the ash that reduces the boiler and returns adheres to, is favorable to reducing to pile up and the caking, conveniently saves once more.
Further, as shown in fig. 4, the scraper 15 has an arc-shaped bent portion 1501 and a scraping portion 1502 arranged at an inclined angle at the end, and the bent portion 1501 cooperates with the scraping portion 1502 to facilitate descaling of the arc-shaped inner wall; the length of the bristles 16 is slightly greater than that of the scraper 15 so as to ensure that the bristles can be attached to the inner wall;
a fluid modifying body 19 is arranged right below an inlet (communicated with a three-way valve 6) of the ash returning transfer bin 7, the fluid modifying body 19 is arranged by staggering the vertical rotating shaft 12 and the horizontal rod 13, a lacing wire is arranged on the fluid modifying body 19, and the other end of the lacing wire is fixed on the inner wall of the ash returning transfer bin, so that the fluid modifying body 19 is kept suspended. The fluid changing body 19 can change the flow direction of returned ash added into the ash returning transfer bin 7, so that accumulation is avoided, and the ash returning transfer bin is uniformly dispersed.
As further shown in fig. 5, the horizontal rods 13 and the diagonal rods 17 are diamond-shaped in cross section and arc-shaped in transition at two sides, so that the connection strength can be ensured, and the boiler return ash can be prevented from being accumulated on the horizontal rods 13 or the diagonal rods 17.
Example four:
the embodiment provides the heat preservation structure of the ash returning transfer bin in the first embodiment.
As shown in fig. 2, an insulating layer 701 is arranged on the outer wall of the ash returning transit bin 7, and an electric heating layer 702 is arranged between the insulating layer 701 and the outer wall of the ash returning transit bin 7; the electric heating layer 702 is an electric heating wire wound on the outer wall of the ash returning transit bin 7, and the heat preservation layer 701 is heat preservation cotton wrapped outside.
The arrangement of the heat insulation layer 701 can maintain the ash return temperature in the ash return transfer bin 7, so as to avoid overcooling; electric heating wire can be when needing do return ash transfer bin 7 heating, the inside boiler of drying returns the ash, reduces moisture, avoids the caking.
Example five:
this embodiment provides the caking breaker of return ash transfer bin in embodiment one.
As shown in fig. 2 and 7, an agglomeration crushing device 20 is disposed at a position of the ash returning revolving bin 7 close to the discharge port, the agglomeration crushing device 20 includes a pair of crushing shafts 2001 with opposite rotation directions, the pair of crushing shafts 2001 span over the discharge port of the ash returning revolving bin 7, meshing crushing teeth 2002 are disposed on the pair of crushing shafts 2001, and matching crushing teeth 2002 are also disposed inside the ash returning revolving bin 7 corresponding to the crushing shafts 2001.
Further, one end of the crushing shaft 2001 is connected with a second rotating motor 2003, and the second rotating motor 2003 is installed on the outer wall of the ash returning transit bin 7 through a motor installation seat 2004; one ends of the pair of crushing shafts 2001 remote from the second rotating electric machine 2003 are connected by a steering gear group 2005. A pair of crushing shafts 2001 are rotatably supported and connected with the outer wall of the ash returning transit bin 7.
When the ash returning transfer bin 7 discharges materials, the second rotating motor 2003 is started, the pair of crushing shafts 2001 rotate oppositely, and the crushing teeth 2002 on the crushing shafts can crush the agglomerated boiler return ash, so that the discharged boiler return ash is in a dispersed powder state, and subsequent production and processing are facilitated.
The use of a steering gear set 2005 avoids the provision of multiple motors; according to the size of the space position near the discharge port, crushing shafts 2001 with different sizes are arranged; the number of the crushing shafts 2001 is not limited to one pair, and a plurality of crushing shafts may be stacked in space.
Example six:
this embodiment provides an inner structure of the return ash hopper of the boiler in the first embodiment.
As shown in fig. 8, an opening is arranged on the horizontal section of the outlet pipeline of the kiln tail boiler 1, and the opening is connected with the boiler ash return hopper 2; the inner side wall and the top of the boiler ash returning hopper 2 are provided with a plurality of vertical baffles 203, and the vertical baffles 203 form an airflow maze.
A plurality of setting of perpendicular baffle 203 for the boiler returns ash and when the air current flows from air intake 201 to air outlet 202 along with the air current, air current and boiler return ash can strike on perpendicular baffle 203, can make the boiler return ash and drop, and the multilayer flow channel who buckles can stop most return ash in the ash hopper 2 is returned to the boiler with the striking, so that reuse promotes the boiler and returns ash collection effect.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. An ash return control device for a cement production line comprises a kiln tail boiler, a warehousing elevator and a raw material homogenizing warehouse; the kiln tail boiler is characterized in that a first ash returning zipper machine is arranged below an outlet pipeline of the kiln tail boiler, the output end of the first ash returning zipper machine is connected with a three-way valve, one outlet of the three-way valve is connected to an ash returning transfer bin, the other outlet of the three-way valve is connected to a second ash returning zipper machine, one end of the second ash returning zipper machine is connected to the warehousing elevator, and the warehousing elevator is connected with the raw material homogenizing warehouse;
a conveying reamer is arranged between a discharge hole of the ash returning transfer bin and the second ash returning zipper machine, and a scaling removing device and a caking crushing device are also arranged in the ash returning transfer bin; boiler return ash stored in the return ash transfer bin falls onto the conveying reamer through the discharge hole after being dispersed and crushed and is conveyed to the second return ash zipper machine;
one side of an outlet pipeline of the kiln tail boiler is also connected with a boiler ash return hopper, the other side of the boiler ash return hopper is connected with a high-temperature fan, and the high-temperature fan pumps and circulates high-temperature gas in the kiln tail boiler; and an ash outlet of the boiler ash returning hopper corresponds to the first ash returning zipper machine.
2. A control method comprising the ash return control apparatus for a cement manufacturing line according to claim 1, wherein the control method comprises the following steps: boiler return ash is normally collected by a boiler return ash hopper at the outlet pipeline of the kiln tail boiler, and falls into a first return ash zipper machine through the outlet pipeline of the kiln tail boiler and the boiler return ash hopper respectively;
when the cement production line is in normal production, the three-way valve is communicated with the second ash returning zipper machine and closes a channel connected with the ash returning transfer bin; the boiler ash returning on the first ash returning zipper machine sequentially passes through the three-way valve, the second ash returning zipper machine and the warehousing elevator to reach the raw material homogenizing warehouse;
when a raw material grinding system of a cement production line stops, the three-way valve closes a channel connected with the second ash returning zipper machine and a channel communicated with the ash returning transfer bin; the boiler return ash on the first ash return zipper machine directly enters the ash return transfer bin for storage through the three-way valve;
when the raw material grinding system is normally started, the three-way valve is communicated with the second ash returning zipper machine and closes a channel connected with the ash returning transfer bin; and when the boiler return ash on the first ash return zipper machine sequentially passes through the three-way valve, the second ash return zipper machine and the warehousing elevator to reach the raw material homogenizing warehouse, the boiler return ash stored in the return ash transfer bin reaches the raw material homogenizing warehouse through the conveying reamer, the second ash return zipper machine and the warehousing elevator.
3. The control method of the ash return control device for the cement production line according to claim 2, further comprising the following control steps: the ash returning transfer bin is used for carrying out heat preservation treatment on the returned boiler ash stored in the ash returning transfer bin; the ash returning transfer bin regularly stirs the boiler ash returning inside and scrapes scales on the inner wall of the ash returning transfer bin; and the ash returning transfer bin is used for crushing the agglomerated boiler return ash in the discharging process and then discharging the crushed boiler return ash.
4. The ash return control device for the cement production line according to any one of claims 1 or 2, wherein the ash return transfer bin has a cylindrical storage section and a truncated cone shaped discharge section; a vertical rotating shaft is arranged in the ash returning transfer bin, the end part of the vertical rotating shaft extends into the truncated cone-shaped discharging part, a plurality of horizontal rods are arranged on the outer circumference of the vertical rotating shaft in a vertically staggered manner, and an inclined rod is connected to the end part close to the vertical rotating shaft; the end parts of the horizontal rod and the inclined rod are respectively connected with a scraper and bristles through mounting plates, the bristles are positioned behind the scraper in the rotating direction, and the end parts of the scraper and the bristles are respectively abutted against the inner wall of the ash returning transit bin; the other end of vertical rotation axis is connected with first rotating electrical machines, first rotating electrical machines install return on grey top or the mounting bracket in transit bin.
5. The ash return control device for the cement production line according to claim 4, wherein the scraper is arc-shaped, the end of the scraper is provided with a scraping part arranged at an inclined angle, and the length of the bristles is greater than that of the scraper; and a fluid changing body is arranged right below an inlet of the ash returning transfer bin, and the fluid changing body is staggered with the vertical rotating shaft and the horizontal rod.
6. The ash returning control device for the cement production line according to any one of claims 1 or 2, wherein a caking crushing device is arranged at a position, close to the discharge port, of the ash returning transfer bin, the caking crushing device comprises a pair of crushing shafts with opposite rotation directions, the pair of crushing shafts cross over the discharge port of the ash returning transfer bin, meshed crushing teeth are arranged on the pair of crushing shafts, and matched crushing teeth are also arranged in the ash returning transfer bin corresponding to the crushing shafts.
7. The ash return control device for the cement production line according to claim 6, wherein one end of the crushing shaft is connected with a second rotating motor, and the second rotating motor is mounted on the outer wall of the ash return transfer bin through a motor base; one ends of the crushing shafts, which are far away from the second rotating motor, are connected through a steering gear set.
8. The ash return control device for the cement production line according to any one of claims 1 or 2, wherein an insulating layer is arranged on the outer wall of the ash return transfer bin, and an electric heating layer is arranged between the insulating layer and the outer wall of the ash return transfer bin; the electric heating layer is an electric heating wire wound on the outer wall of the ash returning transit bin.
9. The ash return control device for the cement production line according to any one of claims 1 or 2, wherein an opening is formed in a horizontal section of an outlet pipeline of the kiln tail boiler, and the opening is connected with the boiler ash return hopper; the inner wall and the top of the boiler ash return hopper are provided with a plurality of vertical baffles, and the vertical baffles form an airflow maze.
10. The ash return control device for the cement production line according to any one of claims 1 or 2, wherein the ash outlet of the boiler ash return hopper is provided with a heavy hammer turnover plate airlock valve.
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| CN202010564638.3A CN111533474A (en) | 2020-06-19 | 2020-06-19 | Ash return control device and control method for cement production line |
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| CN202010564638.3A CN111533474A (en) | 2020-06-19 | 2020-06-19 | Ash return control device and control method for cement production line |
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