Industrial silicon waste heat boiler ash removal system

Abstract

The utility model discloses an industrial silicon waste heat boiler ash cleaning system, which relates to the field of industrial silicon smelting and comprises an ash cleaning brush frame arranged in a boiler chamber, a plurality of conical ash hoppers arranged below the ash cleaning brush frame, an ash discharging pipe connected with the bottom of each conical ash hopper, an ash discharging pipe communicated with an inlet of a bin pump, and an ash conveying pipe connected with the bottom of the bin pump. A Roots blower is mounted at the inlet end of the ash conveying pipe; wherein the bin pump comprises a compressed air pipeline, compressed air is input into the pump through the compressed air pipeline for pressurization, and accumulated ash is discharged to the ash conveying pipe; according to the utility model, micro silicon powder attached to the heat exchange tube of the waste heat boiler is cleaned through the up-and-down reciprocating motion of the ash cleaning and brushing frame; fly ash in the conical ash hopper completely enters the ash conveying pipe at the bottom through acting of compressed air in the bin pump, accumulated ash is conveyed to the outside under the action of the Roots blower, the situation that the ash discharging pipe and the ash conveying pipe are blocked due to the fact that the viscosity of the accumulated ash is large can be avoided, continuous accumulated ash cleaning and conveying are achieved for the waste heat boiler, and the heat exchange efficiency of the waste heat boiler is effectively improved.

Description

Technical Field

[0001] The utility model relates to the field of industrial silicon smelting, and particularly relates to an ash cleaning system for an industrial silicon waste heat boiler. Background Art

[0002] In the industrial silicon smelting industry, waste heat boilers mainly reuse the high-temperature flue gas generated by submerged arc furnaces. When the flue gas passes through the inside of the waste heat boiler box body, the water in the heat exchange tube bundle is heated to generate high-temperature steam.

[0003] After the waste heat boiler is used for a long time, ash will accumulate in the furnace cavity, affecting the heat exchange efficiency of the boiler, resulting in a decrease in the efficiency of the waste heat boiler, a reduction in steam production, and an increase in the exhaust gas temperature. In severe cases, it will also affect the normal operation of the dust collector at the rear of the production process. Therefore, it is necessary to clean the ash regularly.

[0004] In the existing ash cleaning system, an ash cleaning brush rack, a star-shaped discharger, and a Roots blower are used for ash removal and ash transportation. However, due to the large content and high viscosity of microsilica powder in the high-temperature flue gas generated during the production of submerged arc furnaces, the accumulated ash cannot normally fall into the ash transportation pipe by gravity after entering the star-shaped discharger, often causing blockages in the ash discharge pipe and the ash transportation pipe. Manual dredging and cleaning are required. In severe cases, the waste heat boiler needs to be shut down for maintenance, greatly increasing the labor cost and reducing the economic benefits of the workshop. Content of the Utility Model

[0005] Aiming at the deficiencies of the above-mentioned existing technologies, the utility model provides an ash cleaning system for an industrial silicon waste heat boiler, which can efficiently clean the furnace cavity of the waste heat boiler, realize continuous ash cleaning and transportation, effectively avoid blockages in the ash discharge pipe and the ash transportation pipe, and improve the heat exchange efficiency of the waste heat boiler.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] An ash cleaning system for an industrial silicon waste heat boiler includes an ash cleaning brush rack arranged in the boiler furnace cavity. A plurality of conical ash hoppers are arranged below the bottom of the furnace cavity and below the ash cleaning brush rack. The bottom of each conical ash hopper is connected to an ash discharge pipe, the bottom of the ash discharge pipe is communicated with the inlet of a bin pump, the bottom of the bin pump is connected to an ash transportation pipe, and a Roots blower is installed at the inlet end of the ash transportation pipe;

[0008] Among them, the bin pump includes a compressed air pipeline, and compressed air is input into the pump through the compressed air pipeline to pressurize and discharge the accumulated ash into the ash transportation pipe.

[0009] As a further implementation method, a pneumatic feed valve is arranged at the inlet of the bin pump, and a blanking pipeline is connected to the bottom of the bin pump. A pneumatic discharge valve is arranged on the blanking pipeline for realizing automatic ash transportation.

[0010] As a further implementation method, an air compressor pump is externally connected to the compressed air pipeline. The compressed air pipeline includes a first air inlet pipeline and a second air inlet pipeline. The first air inlet pipeline is connected to the upper part of the silo pump, and the second air inlet pipeline is connected to the bottom of the silo pump. The compressed air introduced through the second air inlet pipeline acts on the accumulated ash in the silo pump upward through the vulcanization plate in the silo pump.

[0011] As a further implementation method, a silo pump booster valve is arranged on the first air inlet pipeline, and a vulcanization valve is arranged on the second air inlet pipeline. The silo pump booster valve and the vulcanization valve are controlled in a linked manner.

[0012] As a further implementation method, a pneumatic feeding valve is arranged at the top inlet of the silo pump, and a pneumatic discharging valve is arranged between the bottom outlet of the silo pump and the ash conveying pipe for realizing automatic ash conveying.

[0013] As a further implementation method, a knife gate valve is arranged on the ash discharging pipe for controlling the on-off of the process of the accumulated ash falling.

[0014] As a further implementation method, a spring compensator is installed between the conical ash hopper and the silo pump for flexible connection, playing a role in shock absorption and buffering, and avoiding damage to the ash discharging pipe and the knife gate valve caused by stress generated when the silo pump works.

[0015] As a further implementation method, the spring compensator includes an expansion joint with an axis along the vertical direction and arranged around the ash discharging pipe. The top end and the bottom end of the expansion joint are respectively fixedly connected with an upper connecting piece and a lower connecting piece; the upper connecting piece and the lower connecting piece are connected by a tie rod bolt, and the upper and lower connecting pieces can slide relative to the tie rod bolt to play a role in shock absorption and buffering for the silo pump.

[0016] As a further implementation method, the upper connecting piece is installed at the bottom of the knife gate valve, and the lower connecting piece is connected to the top of the pneumatic feeding valve.

[0017] As a further implementation method, both the upper connecting piece and the lower connecting piece are made of flanges.

[0018] As a further implementation method, the boiler includes a plurality of furnace cavities, and the plurality of furnace cavities are arranged relatively independently.

[0019] As a further implementation method, the ash cleaning brush frame is horizontally arranged in the boiler furnace cavity and is slidably connected to the inside of the heat exchange tube; the ash cleaning brush frame is driven by a motor to make reciprocating up and down movements.

[0020] As a further implementation method, a plug valve at the inlet end of the ash conveying pipe is further installed at the inlet end of the ash conveying pipe, and a plug valve at the outlet end of the ash conveying pipe is installed at the outlet end of the ash conveying pipe.

[0021] Adopting the above technical solutions, the beneficial effects of the present utility model are as follows:

[0022] 1. By reciprocating the ash cleaning brush frame up and down, the utility model can clean the microsilica powder adhered to the heat exchange tube bundle of the waste heat boiler, effectively improve the ash cleaning efficiency, and achieve efficient ash cleaning.

[0023] 2. On the basis of efficient ash cleaning, the utility model uses the work of compressed air in the silo pump to provide power to make all the ash accumulated in the conical ash hopper enter the ash conveying pipe at the bottom, and is conveyed to the external microsilica powder collection device under the action of the Roots blower. It can avoid the blockage of the ash discharge pipe and the ash conveying pipe caused by the large viscosity of the accumulated ash, so as to realize continuous ash cleaning and conveying of the waste heat boiler, effectively improve the heat exchange efficiency of the waste heat boiler, reduce the failure rate of the waste heat boiler at the same time, ensure the stable operation of the boiler, reduce the maintenance cost, and create better economic benefits for the industrial silicon waste heat boiler. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The attached drawings forming a part of this utility model are used to provide a further understanding of this utility model. The schematic embodiments and descriptions thereof of this utility model are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0025] Figure 1 It is the overall system structure diagram of the embodiment of this utility model;

[0026] Figure 2 It is the structure diagram of the silo pump of the embodiment of this utility model;

[0027] Figure 3 It is the structure diagram of the spring compensator of the embodiment of this utility model.

[0028] In the figure: 1, Roots blower; 2, silo pump; 3, ash conveying pipe; 4, ash discharge pipe; 5, spring compensator; 6, flap valve; 7, ash cleaning brush frame; 8, conical ash hopper; 9, ash conveying pipe inlet flap valve; 10, ash conveying pipe outlet flap valve; 11, steam drum; 12, superheater header; 13, evaporator; 14, high-temperature economizer; 15, low-temperature economizer; 16, first inlet gas pipeline; 17, second inlet gas pipeline;

[0029] 21, silo pump booster valve; 22, sulfidation valve; 23, pneumatic feeding valve; 24, pneumatic discharging valve; 25, exhaust port;

[0030] 51, expansion joint; 52, tie rod bolt; 53, upper flange; 54, lower flange. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] It should be noted that the following detailed description is illustrative and aims to provide further explanation of the present utility model. Unless otherwise specified, all technical and scientific terms used in the present utility model have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present utility model belongs.

[0032] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present utility model. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0033] Embodiment 1

[0034] In a typical embodiment of the present application, a soot cleaning system for an industrial silicon waste heat boiler is provided. As Figures 1-3 shown, it includes a soot cleaning brush rack 7 arranged in the boiler furnace cavity. A plurality of conical ash hoppers 8 are provided below the bottom of the furnace cavity and below the soot cleaning brush rack 7. The bottom of each conical ash hopper 8 is connected to a downcomer 4. The bottom of the downcomer 4 is communicated with the inlet of a bin pump 2. The bottom of the bin pump 2 is connected to an ash conveying pipe 3. A Roots blower 1 is installed at the inlet end of the ash conveying pipe 3. Among them, the bin pump 2 includes a compressed air pipeline. Compressed air is input into the pump through the inlet pipeline of the compressed air pipeline to increase the pressure inside the bin pump. The compressed air at the bottom forms a fluid state of the fly ash particles inside the bin pump through the bin pump vulcanizing disc, and then the fly ash is input into the ash conveying pipe.

[0035] Specifically, as Figure 1 shown, a steam drum 11 for storing water vapor is installed at the top of the waste heat boiler. A plurality of independently arranged furnace cavities are provided inside the boiler for different treatment processes. In this embodiment, it includes a superheater header 12, five groups of evaporators 13, a high-temperature economizer 14, and a low-temperature economizer 15.

[0036] A horizontal soot cleaning brush rack 7 is arranged in each furnace cavity. The soot cleaning brush rack 7 is slidably connected to the inner wall of the heat exchange tube and can reciprocate up and down under the drive of a motor to scrape off dust such as microsilica powder adhering to the inside of the tube, keep the furnace cavity clean, and improve the heat exchange efficiency of the boiler.

[0037] In this embodiment, a conical ash hopper 8 is installed at the bottom of each furnace cavity box body. The accumulated ash cleaned by the soot cleaning brush rack 7 falls into the conical ash hopper 8 under the action of gravity. As Figure 1As shown, the bottom conical opening of the conical ash hopper 8 is connected to the ash discharge pipe 4. An insertion plate valve 6 for controlling the on-off of the ash accumulation falling is provided on the ash discharge pipe 4. The insertion plate valve adopts an existing product on the market. Its functions are as follows: First, when the conical ash hopper is blocked and needs to be dredged and cleaned, the ash discharge volume can be manually controlled through the insertion plate valve, without causing faults in the ash transportation system; Second, after a fault occurs in the bottom ash transportation system, the insertion plate valve can be closed for maintenance of a single group of ash transportation systems, without the need for the entire boiler to stop operation, ensuring the continuous operation of the boiler.

[0038] In this embodiment, a spring compensator 5 for realizing the flexible connection between the silo pump 2 and the conical ash hopper 8 is further provided below the insertion plate valve 6. As Figure 3 shown, the spring compensator 5 includes an expansion joint 51 whose axis is along the vertical direction and surrounds the ash discharge pipe. The top end of the expansion joint 51 is fixed with an upper flange 53, and the bottom is fixedly connected to a lower flange 54. Among them, the upper flange 53 is installed at the lower end of the insertion plate valve 6 and is fixedly connected to the connecting flange at the bottom end of the insertion plate valve. The lower flange 54 is installed above the silo pump and is fixedly connected to the connecting flange at the upper end of the pneumatic feed valve 23, thereby installing the spring compensator between the conical ash hopper and the silo pump. The upper flange and the lower flange are connected by a tie rod bolt 52. When the silo pump vibrates, the upper and lower flanges can slide relative to each other along the tie rod bolt 52, playing a shock absorption and buffering role for the silo pump 2, and avoiding damage to the ash discharge pipe, insertion plate valve or conical ash hopper caused by stress generated by the silo pump doing work. Among them, the expansion joint is made of metal and can adopt existing products on the market.

[0039] In this embodiment, as Figure 2 shown, at the top end of the silo pump, a pneumatic feed valve 23 is provided at the top inlet of the silo pump for controlling the on-off of the feed port. When the level gauge detects that the ash accumulation in the pump reaches the set quantity or height, the pneumatic feed valve automatically closes. The bottom of the silo pump is connected with a blanking pipeline, and the other end of the blanking pipeline is connected to the ash transportation pipe 3. A pneumatic discharge valve 24 is provided on the blanking pipeline, which can automatically open for ash transportation when a certain pressure is reached in the silo pump. By setting the pneumatic feed valve and the pneumatic discharge valve, the maximum degree of automation operation of the equipment can be realized, saving labor costs and improving the ash transportation efficiency.

[0040] In addition, in this embodiment, the external of the compressed air pipeline is connected to an air compressor pump for inputting compressed air into the pump. As Figure 2As shown in the figure, the compressed air pipeline includes a first intake pipeline 16 and a second intake pipeline 17 connected in parallel. The first intake pipeline 16 is connected to the upper part of the silo pump 2. Compressed air enters the silo pump through the first intake pipeline 16 to pressurize the silo pump. A silo pump pressure increasing valve 21 is provided on the first intake pipeline to control the on-off of the intake pipeline. In this embodiment, a vulcanizing plate with a plurality of air holes is installed at the bottom of the silo pump. The second intake pipeline 17 is connected to the bottom of the silo pump. Compressed air acts on the fly ash in the silo pump through the air holes from below the vulcanizing plate. The compressed air at the bottom makes the fly ash particles in the silo pump form a fluid state through the vulcanizing plate of the silo pump, which helps to thoroughly and efficiently input the fly ash into the ash conveying pipe.

[0041] Among them, a silo pump pressure increasing valve 21 is provided on the first intake pipeline, and a vulcanizing valve 22 is provided on the second intake pipeline. The silo pump pressure increasing valve 21 and the vulcanizing valve 22 are linked and controlled to achieve synchronous opening and closing.

[0042] In addition, an exhaust port 25 is also provided on the side of the top of the silo pump 2, and a pneumatic exhaust valve (not shown in the figure) that can automatically control the on-off of the exhaust port is provided in the exhaust port.

[0043] The working process of the silo pump is as follows: During feeding, the exhaust port is opened, and the pneumatic feeding valve is opened. The accumulated ash in the conical ash hopper enters the silo pump through the ash discharging pipe. When the level gauge in the silo pump detects that the accumulated ash in the pump reaches the set amount, the pneumatic feeding valve and the pneumatic exhaust valve are automatically closed to stop feeding. The compressed air pump is started, and the silo pump pressure increasing valve and the vulcanizing valve are synchronously opened to input compressed air from above and below the silo pump respectively. The air pressure above the ash material in the silo pump increases, and the ash material at the bottom is in a fluid state under the action of compressed air; when the air pressure in the pump reaches the set value, the pneumatic discharging valve is automatically opened, and the silo pump pressure increasing valve and the vulcanizing valve are synchronously closed, and the accumulated ash in the pump can be thoroughly cleaned and output into the ash conveying pipe, and discharged to the external ash storage through the ash conveying pipe, effectively avoiding the blockage caused by the sticky dust adhering to the ash discharging pipe and the ash conveying pipe.

[0044] In this embodiment, the top inlet of the silo pump 2 is communicated with the ash discharging pipe 4. When the gate valve 6 is opened, the fly ash can enter the silo pump from the conical ash hopper 8 through the ash discharging pipe, and flow out from the bottom of the silo pump under the dual action of gravity and the blowing of compressed air, and fall into the bottom ash conveying pipe 3 through the feeding pipeline, which can avoid the blockage caused by the sticky fly ash adhering to the ash discharging pipe and the ash conveying pipe, and can realize the continuous ash cleaning and conveying of the waste heat boiler, effectively improving the heat exchange efficiency of the preheating boiler and reducing the maintenance cost at the same time.

[0045] In this embodiment, a plug valve 9 is also installed at the inlet end of the ash conveying pipe 3. The plug valve 9 at the inlet of the ash conveying pipe and the Roots blower 1 are standby equipment. Once a failure occurs in the pneumatic ash conveying system and the ash conveying pipe is blocked, the plug valve at the inlet of the ash conveying pipe can be opened, and the Roots blower can be started for positive pressure dredging. A plug valve 10 is installed at the outlet end of the ash conveying pipe 3. The plug valve 10 at the outlet of the ash conveying pipe is interlocked with the pneumatic ash conveying system and the Roots blower 1. When the boiler is shut down for maintenance, closing the plug valve at the outlet of the ash conveying pipe can effectively ensure the personal safety of the operators.

[0046] The working principle of this embodiment is as follows:

[0047] When the waste heat boiler is operating normally, the soot cleaning brush holder 7 is driven by a motor to move up and down reciprocally, brushing the microsilica adhered to the heat exchange tube bundle of the waste heat boiler to the bottom conical ash hopper 8. The soot cleaning brush holder is provided with current protection; when the soot cleaning brush holder gets stuck or other failures occur, the motor can automatically stop running after the circuit current exceeds the set protection value, ensuring the safety of the system.

[0048] After the fly ash enters the conical ash hopper 8, it enters the ash discharge pipe 4 by gravity, and successively passes through the plug valve 6 and the spring compensator 5 and falls into the silo pump 2 connected to the bottom of the ash discharge pipe. In the silo pump 2, the fly ash is all discharged to the ash conveying pipe 3 below by the work of compressed air, and is transported to the external industrial silicon dust removal ash bin by the action of the Roots blower 1.

[0049] When the ash conveying pipe is blocked due to a failure of the waste heat boiler, the Roots blower can be started to dredge the ash conveying pipe to achieve the purpose of boiler soot cleaning.

[0050] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Those of ordinary skill in the art should understand that the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An industrial silicon waste heat boiler cleaning system, characterized in that: It comprises a dust cleaning brush holder arranged in the furnace cavity of the boiler, a plurality of conical ash hoppers are arranged at the bottom of the furnace cavity and below the dust cleaning brush holder, the bottom of each conical ash hopper is connected to an ash lowering pipe, the bottom of the ash lowering pipe is connected to the inlet of a silo pump, the bottom of the silo pump is connected to an ash conveying pipe, and a Roots blower is installed at the inlet end of the ash conveying pipe; Wherein, the silo pump includes a compressed air pipeline, through which compressed air is input into the pump for pressurization, and the accumulated ash is discharged to the ash conveying pipe.

2. The industrial silicon waste heat boiler cleaning system according to claim 1, characterized in that: The compressed air pipeline is externally connected to an air compression pump, and the compressed air pipeline includes a first air inlet pipeline and a second air inlet pipeline. The first air inlet pipeline is connected to the upper part of the silo pump, and the second air inlet pipeline is connected to the bottom of the silo pump. The compressed air introduced through the second air inlet pipeline passes upward through the vulcanization disk in the silo pump to act on the accumulated dust in the silo pump.

3. The industrial silicon waste heat boiler cleaning system according to claim 2, characterized in that: A silo pump boost valve is arranged on the first air intake pipeline, and a vulcanization valve is arranged on the second air intake pipeline. The silo pump boost valve and the vulcanization valve are controlled in linkage.

4. The industrial silicon waste heat boiler cleaning system according to claim 1, characterized in that: The lower ash pipe is provided with a plug valve.

5. The industrial silicon waste heat boiler cleaning system according to claim 1, characterized in that: A pneumatic feed valve is arranged at the top inlet of the silo pump, and a pneumatic discharge valve is arranged between the bottom outlet of the silo pump and the ash conveying pipe.

6. The industrial silicon waste heat boiler cleaning system according to claim 5, characterized in that: A spring compensator is installed between the conical ash hopper and the silo pump.

7. The industrial silicon waste heat boiler cleaning system according to claim 6, characterized in that: The spring compensator includes an expansion joint with its axis in the vertical direction and arranged around the lower ash pipe. The top and bottom ends of the expansion joint are respectively fixedly connected to an upper connecting piece and a lower connecting piece. The upper connecting piece and the lower connecting piece are connected by a tie rod bolt, and the upper and lower connecting pieces can slide relatively along the tie rod bolt.

8. The industrial silicon waste heat boiler cleaning system according to claim 7, characterized in that: The upper connecting piece is installed at the bottom of the gate valve, and the lower connecting piece is connected to the top of the pneumatic feed valve.

9. The industrial silicon waste heat boiler cleaning system according to claim 1, characterized in that: The cleaning brush holder is horizontally arranged in the boiler furnace and is slidably connected to the inside of the heat exchange tube; the cleaning brush holder is driven by a motor to perform up and down reciprocating motion.

10. The industrial silicon waste heat boiler cleaning system according to claim 1, characterized in that: An ash conveying pipe inlet gate valve is also installed at the inlet end of the ash conveying pipe, and an ash conveying pipe outlet gate valve is installed at the outlet end of the ash conveying pipe.

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