Stone multi-stage catching device of desulfurization pulping system of coal-fired power plant

Abstract

The utility model provides a coal-fired power plant desulfurization slurrying system stone multi-stage catching device which comprises a rotary filter cylinder connected with a wet type ball mill, driven by the wet type ball mill to rotate and used for performing first-stage stone separation on slurry discharged from the wet type ball mill; the recycling box is provided with a stirring device; a slope type filter screen is arranged in the stone catcher, the stone catcher is used for carrying out second-stage stone separation, and a drain outlet communicated with the trench is formed in the bottom of the stone catcher; and the collecting box is mounted in the trench in an embedded manner and is used for carrying out third-stage stone separation on the slurry in the trench. According to the stone multi-stage catching device of the desulfurization pulping system of the coal-fired power plant, the rotary filter cylinder, the stone catcher and the collecting box sequentially separate the slurry stage by stage, stone in the slurry is subjected to three-stage separation according to the particle size, abrasion of the stone to equipment such as pipelines, valves and pumps can be avoided, the service life of the equipment is greatly prolonged, and the service life of the equipment is prolonged. The system maintenance cost is reduced, and the system operation stability is improved.

Description

Technical Field

[0001] This application belongs to the field of environmental desulfurization technology for thermal power plants, and more specifically, it relates to a multi-stage stone capture device for a desulfurization slurry system in a coal-fired power plant. Background Technology

[0002] Currently, most coal-fired power plants use limestone-gypsum wet flue gas desulfurization technology, and the slurry preparation system typically employs a wet ball mill. Due to the presence of impurities such as Fe2O3 and SiO2 in the limestone raw material, and the limited grinding performance of the wet ball mill, the slurry always contains a large amount of unground stones. These stones directly affect the quality of the absorber slurry, exacerbate wear on the desulfurization equipment, reduce equipment lifespan, increase maintenance costs, and significantly reduce system operational stability, easily leading to NO2 buildup. x Environmental incidents involving excessive emissions of pollutants such as SO2 have occurred. Currently, coal-fired power plants primarily employ single-stage separation technology, which relies solely on a rotating filter cartridge at the outlet of a wet ball mill for separation. This technology can only remove larger stone particles and cannot clean relatively smaller ones, resulting in incomplete stone removal. Furthermore, if the rotating filter cartridge is damaged, it becomes impossible to separate stones, causing significant damage to subsequent equipment operation. Utility Model Content

[0003] The purpose of this application is to provide a multi-stage stone capture device for a coal-fired power plant desulfurization slurry system that can effectively remove hard-to-grind stones from a limestone slurry system.

[0004] To achieve the above objectives, the technical solution adopted in this application is: to provide a multi-stage stone capture device for a desulfurization slurry system in a coal-fired power plant, used for stone separation in the desulfurization slurry process of a coal-fired power plant, comprising:

[0005] A rotary filter cartridge, connected to and driven by a wet ball mill, is used for the first-stage stone separation of the slurry discharged from the wet ball mill.

[0006] The recirculation tank is equipped with a stirring device for stirring the slurry discharged from the rotating filter cylinder evenly;

[0007] The stone catcher has a built-in inclined filter screen for secondary stone separation of the slurry discharged from the recirculation tank. The bottom of the stone catcher is provided with a sewage outlet connected to the ditch.

[0008] The collection box, embedded in the trench, is used for the third-stage stone separation of the slurry in the trench.

[0009] In one embodiment, the stone catcher is equipped with a backwashing device to flush the ramp filter when it becomes clogged.

[0010] In one embodiment, the chamber within the stone catcher is divided into a stone catching zone and a slurry buffer zone by the inclined filter screen. The stone catching zone is located below the inclined filter screen, and the slurry buffer zone is located above the inclined filter screen. An inlet and an outlet are respectively provided on opposite sides of the stone catcher. The recirculation tank is connected to the stone catcher through the inlet. The drain outlet is located below the inlet. A first pump is connected to the outlet. The first pump is used to pump the slurry in the slurry buffer zone to the absorption tower of the desulfurization slurry preparation system.

[0011] In one embodiment, the angle between the sloping filter and the horizontal direction ranges from 45 degrees to 60 degrees.

[0012] In one embodiment, the recirculation tank is a cylindrical vertical metal tank, the stirring device is located in the center of the metal tank, and the side wall of the metal tank has an inspection hole.

[0013] In one embodiment, the system further includes a second pump body and a filtration pit located at the drainage end of the ditch. The filtration pit is used to purify the flushing water flowing out of the collection box and to transport the purified flushing water to the wet ball mill via the second pump body.

[0014] In one embodiment, the mesh size of the screen in the rotating filter cartridge is 10-12 mm.

[0015] In one embodiment, the pore size of the sloped filter screen is 6-8 mm.

[0016] In one embodiment, the collection box is a rectangular box made of stainless steel mesh, with a handle on the top of the box, and the height and width of the box are equal to the depth and width of the trench, respectively.

[0017] In one embodiment, the aperture of the stainless steel mesh of the enclosure is 4-6 mm.

[0018] The beneficial effects of the multi-stage stone capture device for desulfurization slurry system in coal-fired power plants provided in this application are as follows: Compared with the prior art, the multi-stage stone capture device for desulfurization slurry system in coal-fired power plants provided in this application separates the slurry in stages through a rotating filter cartridge, a stone capture device, and a collection box. The stones in the slurry are separated in three stages according to particle size, so that the stones in the slurry can be thoroughly cleaned, avoiding wear and tear on pipes, valves, pumps and other equipment caused by the stones, greatly extending the service life of the equipment, reducing system maintenance costs, and improving the stability of system operation. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This application provides a schematic diagram of the structure of a multi-stage stone capture device for a desulfurization slurry preparation system in a coal-fired power plant.

[0021] Figure 2 for Figure 1 The diagram shows a structural schematic of a stone catcher in a multi-stage stone catcher of a desulfurization slurry system in a coal-fired power plant.

[0022] Figure 3 To adopt Figure 1 The diagram shows a process flow chart of a multi-stage stone capture device for cleaning stones in a desulfurization slurry preparation system of a coal-fired power plant.

[0023] The following are the labeling elements in the figure:

[0024] 1-Wet ball mill; 2-Absorption tower; 3-First pump body; 10-Rotary filter cartridge; 20-Recirculation tank; 30-Stone catcher; 40-Collection tank; 50-Ditch; 60-Filtration pit; 21-Agitator; 22-Inspection hole; 31-Sloping filter screen; 32-Backwashing device; 33-Drain outlet; 34-Stone catcher zone; 35-Slurry buffer zone; 301-Inlet; 302-Outlet; 41-Handle. Detailed Implementation

[0025] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0026] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0027] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0028] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly and specifically limited.

[0029] Please refer to Figures 1 to 3 , now a kind of coal-fired power plant desulfurization pulp system stone multistage capture device provided by the embodiment of the present application will be described. The stone multistage capture device of the coal-fired power plant desulfurization pulp system comprises a rotating filter cylinder 10, a recirculation tank 20, a stone catcher 30 and a collection tank 40. The rotating filter cylinder 10, the recirculation tank 20, the stone catcher 30 and the collection tank 40 are arranged from upstream to downstream in the flow direction of the slurry.

[0030] One end of the rotating filter cylinder 10 is connected with the wet ball mill 1 and rotates with the wet ball mill 1, and the rotating filter cylinder 10 is used for first-stage stone separation of the slurry discharged from the wet ball mill 1. The recirculation tank 20 is provided with a stirring device 21, and the stirring device 21 is used for stirring the slurry discharged from the rotating filter cylinder 10 uniformly. The stone catcher 30 is internally provided with an inclined slope filter screen 31, which is used for second-stage stone separation of the slurry discharged from the recirculation tank 20, and the bottom of the stone catcher 30 is provided with a blow-off port 33 connected with a trench 50. The collection tank 40 is embeddedly installed in the trench 50, and the collection tank 40 is used for third-stage stone separation of the slurry in the trench 50, so as to form three-stage separation, and different particle size stones are separated from the slurry step by step.

[0031] Through the three-stage stone cleaning composed of the rotating filter cylinder 10, the stone catcher 30 and the collection tank 40, the hard-to-grind stones in the limestone pulp system can be fully removed, the wear of the pipes and pump seals, impellers and pump casings and the like caused by the stones can be avoided, the requirements of stable operation of the system can be met, the stones can be thoroughly cleaned, and the service life of the equipment can be improved.

[0032] This application provides a multi-stage stone capture device for a desulfurization slurry preparation system in a coal-fired power plant. Compared with the prior art, the rotating filter cartridge 10, stone catcher 30, and collection box 40 sequentially separate the slurry in three stages. The stones in the slurry are separated in three stages according to particle size, which can thoroughly remove the stones from the slurry, avoid wear and tear on pipes, valves, pumps, and other equipment caused by the stones, greatly extend the service life of the equipment, reduce system maintenance costs, and improve the stability of system operation.

[0033] The rotary filter cartridge 10 is cylindrical in shape, and its outer surface is covered with a stainless steel screen. During operation, the rotary filter cartridge 10 rotates synchronously with the wet ball mill 1. The rotary filter cartridge 10 is equipped with a stone discharge port to discharge larger stones, thus completing the first stage of stone separation.

[0034] The recirculation tank 20 is located below the rotating filter cartridge 10. The recirculation tank 20 is a cylindrical, vertical, sealed metal box, and an agitator 21 is installed inside, located in the center of the metal box. The metal box wall is provided with an inspection hole 22 to observe the operation inside the box and to perform maintenance on the internal components.

[0035] See Figure 1 , Figure 2 The stone catcher 30 is cylindrical, with an inclined filter screen 31 inside and a backwashing device 32 outside, which is connected to the inner cavity of the stone catcher 30. The chamber inside the stone catcher 30 is divided into a stone catching zone 34 and a slurry buffer zone 35 by the inclined filter screen 31. The stone catching zone 34 is located below the inclined filter screen 31, and the slurry buffer zone 35 is located above the inclined filter screen 31. One end of the backwashing device 32 is connected to the side wall of the stone catcher 30 and is connected to the slurry buffer zone 35. The stone catcher 30 has an inlet 301 and an outlet 302 on opposite sides. The recirculation tank 20 is connected to the stone catcher 30 through the inlet 301 on one side of the stone catcher 30. The drain outlet 33 is located below the inlet 301, that is, the height of the drain outlet 33 is lower than the height of the inlet 301. The outlet 302 is connected to the first pump body 3. The slurry in the slurry buffer zone 35 can be pumped to the absorption tower 2 of the desulfurization slurry preparation system through the first pump body 3 and pipeline.

[0036] The slope filter screen 31 divides the stone catcher 30 into a stone catching area 34 and a slurry buffer area 35. The bottom of the stone catcher 30 is provided with a sewage outlet 33 which is connected to the trench 50, and the slurry is discharged to the trench 50 through the sewage outlet 33. The slurry falling into the recycling tank 20 is uniformly stirred and then enters the stone catcher 30 under the suction of the power pump. The stones in the slurry fall into the stone catching area 34 under the interception and filtration of the slope filter screen 31 in the stone catcher 30, and when the amount accumulates to a certain amount, the bottom sewage outlet 33 is opened to discharge into the trench 50. If the slope filter screen 31 is blocked, it can be flushed through the backflushing device 32; the slurry passing through the slope filter screen 31 enters the slurry buffer area 35 and is pumped into the slurry supply pipeline behind, and the slurry completes the second stage of stone separation after passing through the stone catcher 30. By providing the backflushing device 32, the problem of blockage and failure to complete stone separation can be avoided.

[0037] Specifically, the inclination angle of the slope filter screen 31 ranges from 45 to 60 degrees, and can be 45 degrees, 48 degrees, 50 degrees, 52 degrees, 54 degrees, 56 degrees, 58 degrees, 60 degrees, etc. The aperture of the slope filter screen 31 is 6-8mm, and can be 6mm, 6.2mm, 6.5mm, 6.8mm, 7mm, 7.2mm, 7.5mm, 7.8mm, 8mm. The upper and lower ends of the slope filter screen 31 are respectively provided with horizontally extending connecting sections which can be connected and fixed with the side walls of the corresponding side of the stone catcher 30, and the slope filter screen 31 can be fixed with the inner wall of the stone catcher 30 by welding, buckling or through connecting pieces.

[0038] The screen aperture of the rotating filter drum 10 is 10-12mm, and can be 10mm, 10.4mm, 10.8mm, 11mm, 11.4mm, 11.8mm, 12mm, etc.

[0039] The collection tank 40 adopts a lifting cage type collection tank which is a rectangular box body made of stainless steel mesh, and is provided with a handle 41 at the top. The handle 41 can be used to lift the box body out of the trench 50. The stones discharged from the bottom sewage outlet 33 of the stone catcher 30 are washed into the lifting cage type collection tank installed at the outlet of the trench 50 for collection, and then manually poured into the designated area. The width and height of the lifting cage type collection tank are equal to the width and height of the trench 50, and it is embeddedly installed in the trench 50. The aperture of the stainless steel mesh of the lifting cage type collection tank is 4-6mm, and can be 4mm, 4.2mm, 4.6mm, 4.8mm, 5mm, 5.2mm, 5.4mm, 5.6mm, 5.8mm, 6mm, etc.

[0040] The stone multi-stage capturing device of the coal-fired power plant desulfurization slurry preparation system further comprises a second pump body (not shown in the figure) and a filtrate pit 60 arranged at the liquid discharge end of the ditch 50. One end of the collecting box 40 extends to the filtrate pit 60, the filtrate pit 60 is used for purifying the washing water flowing out of the collecting box 40, and the purified washing water is sent to the wet-type ball mill 1 through the second pump body, so that the water resources can be recycled.

[0041] Referring to Figures 1 to 3 , the specific steps of cleaning the stones by using the stone multi-stage capturing device of the coal-fired power plant desulfurization slurry preparation system described in the above embodiment are as follows:

[0042] (1) The limestone is mixed with water in a certain proportion and then enters the wet-type ball mill 1 to be ground. The ground slurry enters the rotating filter cartridge 10 at a rate of not more than 7.4 t / h, and the larger particles of stones that are not ground are removed, so that the first-stage coarse separation is completed, that is, the first-stage stone separation is completed.

[0043] (2) After the first-stage coarse separation, the slurry falls into the recirculation box 20 under the action of gravity. After being stirred uniformly by the stirring device 21, the slurry enters the stone capturing device 30 under the action of the power pump. The stones in the slurry fall into the stone capturing area 34 under the filtering and impact actions of the inclined filter screen 31. When the amount of the stones accumulated in the stone capturing area 34 reaches a certain amount, the stones are discharged into the ditch 50 through the blowdown port 33 at the bottom, and the slurry enters the slurry buffer area 35. Then, under the action of the power pump, the slurry enters the slurry supply pipeline. This process is the second-stage fine separation, that is, the second-stage stone separation is completed.

[0044] (3) The stones entering the ditch 50 through the blowdown port 33 at the bottom of the stone capturing device 30 are washed into the cage-type collecting box by the ground washing water, so that the stones are completely removed, and the third-stage separation is completed, that is, the third-stage stone separation is completed. The washing water enters the filtrate pit 60 and is then pumped into the inlet of the wet-type ball mill 1 as limestone dilution water, which is recycled.

[0045] As can be seen from the description of the stone multi-stage capturing device of the coal-fired power plant desulfurization slurry preparation system and the operation steps thereof provided in the above embodiment, the stone multi-stage capturing device of the coal-fired power plant desulfurization slurry preparation system provided in the embodiment has the following advantages compared with the traditional cleaning equipment:

[0046] 1. The rotating filter cartridge 10 of the stone multi-stage capturing device of the coal-fired power plant desulfurization slurry preparation system rotates synchronously with the wet-type ball mill 1. The large particles of stones in the slurry are cleaned by the separation action of the screen and will not enter the subsequent system.

[0047] 2. A stone multi-stage capturing device for a coal-fired power plant desulfurization pulp preparation system, wherein a stone collector is arranged in the device, and the stone collector is divided into a stone capturing area 34 and a pulp buffer area 35 by a slope filter 31, wherein the stones in the pulp fall into the stone capturing area 34 under the interception and filtration of the slope filter 31, and are discharged into a ditch 50 through a bottom blow-off port 33 after accumulating to a certain amount, and the slope filter 31 can be flushed by a backflushing device 32 if it is blocked. The stone collector can effectively prevent the stones from entering the subsequent system, avoid the abrasion of pipes, valves, pumps and other equipment, greatly prolong the service life of the equipment, reduce the system maintenance cost, and improve the system operation stability.

[0048] 3. A stone multi-stage capturing device for a coal-fired power plant desulfurization pulp preparation system, wherein a lifting cage type collecting box is arranged in the device as the last stage of separation, the stones discharged from the bottom blow-off port 33 of the stone capturing device 30 are washed into the lifting cage type collecting box installed at the outlet of the ditch 50, and then are manually poured into a designated area to completely clean the stones out of the entire pulp preparation system.

[0049] 4. A stone multi-stage capturing device for a coal-fired power plant desulfurization pulp preparation system, which is simple to operate and difficult to apply, can realize three-stage separation according to the size of the stone particles in the pulp, effectively clean the stones in the pulp preparation system, avoid the abrasion of pipes, valves, pumps and other equipment, greatly prolong the service life of the equipment, reduce the equipment maintenance cost, improve the system operation stability, reduce the possibility of environmental protection incidents caused by excessive emission of NO x , SO2 and other pollutants.

[0050] The above only describes the preferred embodiments of the present application and is not intended to limit the present application, and any modifications, equivalent replacements and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A multi-stage stone capturing device for a coal-fired power plant desulfurization slurry system, used for separating stones in a coal-fired power plant desulfurization slurry, characterized in that: The application relates to a wet ball mill system for desulfurization slurry, which comprises the following parts: ​ a rotating filter drum, which is connected with the wet ball mill and rotates with the wet ball mill, and is used for carrying out first-stage stone separation on slurry discharged from the wet ball mill; a recirculation tank, which is provided with stirring devices and is used for stirring the slurry discharged from the rotating filter drum; a stone catcher, which is internally provided with a slope filter screen and is used for carrying out second-stage stone separation on the slurry discharged from the recirculation tank, and is provided with a sewage outlet at the bottom of the stone catcher, which is connected with a trench; a collection tank, which is embeddedly installed in the trench and is used for carrying out third-stage stone separation on the slurry in the trench.

2. The pebble multi-stage capturing device of a coal-fired power plant desulfurization pulp system according to claim 1, characterized in that: The stone catcher is provided with backwashing devices, so that the slope filter screen can be washed when the slope filter screen is blocked.

3. The pebble multi-stage capturing device of a coal-fired power plant desulfurization pulp system according to claim 1, characterized in that: The chamber in the stone catcher is divided into a stone catching area and a slurry buffer area by the slope filter screen, the stone catching area is located below the slope filter screen, and the slurry buffer area is located above the slope filter screen; opposite sides of the stone catcher are respectively provided with a liquid inlet and a liquid outlet, the recirculation tank is connected with the stone catcher through the liquid inlet, the sewage outlet is located below the liquid inlet, and a first pump body is connected to the liquid outlet, and the first pump body is used for pumping the slurry in the slurry buffer area to an absorption tower of a desulfurization slurry preparation system.

4. The pebble multi-stage capturing device of a coal-fired power plant desulfurization pulp system according to claim 1, characterized in that: The slope filter screen is arranged at an angle of 45-60 degrees with the horizontal direction.

5. The pebble multi-stage capturing device of a coal-fired power plant desulfurization pulp system according to claim 1, characterized in that: The recirculation tank is a cylindrical vertical metal tank, the stirring devices are arranged at the central position of the metal tank, and an inspection hole is formed in the side wall of the metal tank.

6. The pebble multi-stage capturing device of a coal-fired power plant desulfurization pulp system according to claim 1, characterized in that: The application further comprises a second pump body and a filtrate pit arranged at the liquid outlet end of the trench, the filtrate pit is used for purifying the washing water flowed out of the collection tank, and the purified washing water is sent to the wet ball mill through the second pump body.

7. The pebble multi-stage capturing device of a coal-fired power plant desulfurization pulp system according to claim 1, characterized in that: The screen mesh of the rotating filter drum has a pore size of 10-12 mm.

8. The pebble multi-stage capturing device of a coal-fired power plant desulfurization pulp system according to claim 1, characterized in that: The slope filter screen has a pore size of 6-8 mm.

9. A stone multi-stage capturing device for a coal-fired power plant desulfurization pulp system according to any one of claims 1-8, characterized in that: The collection tank is a rectangular stainless steel mesh tank, the tank top is provided with a handle, and the height and width of the tank are equal to the depth and width of the trench respectively.

10. The pebble multi-stage capturing device of a coal-fired power plant desulfurization slurry system according to claim 9, characterized in that: The stainless steel mesh of the tank has a pore size of 4-6 mm.

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