阅读说明：本技术 一种用于水泥生产线的回灰控制装置及控制方法 (Ash return control device and control method for cement production line ) 是由 方志家 李端 胡高俊 吴佳 周亮 于 2020-06-19 设计创作，主要内容包括：本发明公开一种用于水泥生产线的回灰控制装置及控制方法,包括窑尾锅炉,入库提升机和生料均化库；所述窑尾锅炉的出口管道的下方设有第一回灰拉链机,所述第一回灰拉链机的输出端连接有三通阀,所述三通阀的一个出口连接至回灰中转仓、另一个出口连接至第二回灰拉链机,所述第二回灰拉链机的一端连接至所述入库提升机,所述入库提升机连接所述生料均化库；所述回灰中转仓的出料口与所述第二回灰拉链机之间设有输送铰刀；所述窑尾锅炉的出口管道的一侧还连接有锅炉回灰料斗；在生料粉磨系统停机时,窑尾锅炉的回灰对窑不产生影响,保证了窑工况的正常运行,避免了窑工况变差减产和熟料质量超标的问题；提高了窑熟料产量并减少了能耗的损失。(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.)

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.

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.