Limestone feeding device for in-furnace desulfurization

Abstract

The utility model belongs to the technical field of limestone feeding, and particularly relates to a limestone feeding device for in-furnace desulfurization, which comprises a limestone powder bin, and a discharge port is arranged at the bottom of the limestone powder bin; the electric heating plate is arranged on the inner bottom wall of the limestone powder bin; the vibration discharging mechanism comprises a vibrator, a hose, a discharging pipe and a discharging valve. The number of the hoses is two, the discharging pipe is vertically arranged below the limestone powder bin, the upper end and the lower end of the discharging pipe are communicated with a discharging opening of the limestone powder bin and the upper end of the discharging valve through the hoses respectively, the lower end of the discharging valve is communicated with a blowing mechanism, the vibrator is installed on the discharging pipe, and the vibration end of the vibrator abuts against the outer side wall of the discharging pipe. The discharging end of the blowing mechanism is communicated with a circulating fluidized bed boiler, and limestone powder is not prone to caking.

Description

Technical Field

[0001] The utility model belongs to the technical field of limestone feeding, and in particular relates to a limestone feeding device for desulfurization in a furnace. Background Art

[0002] At present, the circulating fluidized bed boiler flue gas desulfurization generally adopts the limestone furnace desulfurization method. This method mainly uses compressed air as the gas source to blow limestone into the furnace, which directly reacts with SO2 in the flue gas to achieve the purpose of reducing the SO2 content in the flue gas.

[0003] Before the limestone powder is sprayed into the circulating fluidized bed boiler, it is stored in a limestone powder warehouse. Since the limestone powder contains calcium carbonate, calcium oxide, etc., according to the characteristics of limestone, when it is damp and the moisture content is about 6%, the limestone powder is easy to agglomerate, so that the fluidity of the agglomerated limestone material when compressed air is used as the air source to be sprayed into the circulating fluidized bed boiler is poor, thereby affecting the effect of flue gas desulfurization. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a limestone feeding device for in-furnace desulfurization to solve the problem that the limestone powder is stored in the existing limestone powder warehouse. Since the limestone powder contains calcium carbonate, calcium oxide, etc., according to the characteristics of limestone, when it is damp and the moisture content is about 6%, the limestone powder is easy to agglomerate, so that the fluidity of the agglomerated limestone material when compressed air is used as the air source to be blown into the circulating fluidized bed boiler is poor, thereby affecting the effect of flue gas desulfurization.

[0005] The technical solution adopted by the utility model is as follows: a limestone feeding device for in-furnace desulfurization, comprising a limestone powder bin, the bottom of which is connected to a discharge hopper, and a discharge port is provided at the bottom of the discharge hopper;

[0006] An electric heating plate, wherein the electric heating plate is arranged on the inner bottom wall of the discharge hopper;

[0007] A vibrating unloading mechanism, the vibrating unloading mechanism comprising a vibrator, a hose, a unloading pipe and a discharge valve;

[0008] The two hoses are provided, and the two hoses are respectively connected to the two ends of the discharge pipe. The discharge pipe is vertically arranged below the limestone powder bin. The upper and lower ends of the discharge pipe are respectively connected to the discharge port of the discharge hopper and the upper end of the discharge valve through the hose. The lower end of the discharge valve is connected to a blowing mechanism. The vibrator is installed on the outer side wall of the discharge pipe, and the vibrating end of the vibrator abuts against the outer side wall of the discharge pipe.

[0009] The discharge end of the spraying mechanism is connected to a circulating fluidized bed boiler, and the spraying mechanism is used to spray limestone powder into the circulating fluidized bed boiler.

[0010] Furthermore, a plurality of supporting legs are arranged in a circumferential array at the bottom of the limestone powder bin.

[0011] Furthermore, a mounting frame is also provided on the support leg, and the mounting frame includes a connecting rod and a mounting seat. Two connecting rods are provided, and the two connecting rods are fixedly connected to the outer side wall of the mounting seat. The outer ends of the two connecting rods are fixedly connected to the support leg. The mounting seat is located at the bottom of the discharge valve, and the discharge valve is fixedly mounted on the mounting seat.

[0012] Furthermore, the spraying mechanism includes an air compressor, a conveying pipeline and a powder spray nozzle; the air compressor is arranged on one side of the limestone powder bin, the air outlet end of the air compressor is connected to one end of the conveying pipeline, the conveying pipeline is located below the limestone powder bin, the lower end of the discharge valve is connected to the upper middle side of the conveying pipeline, and the other end of the conveying pipeline passes through the side wall of the circulating fluidized bed boiler and extends into the circulating fluidized bed boiler to be connected to the powder spray nozzle.

[0013] Furthermore, a feed port is provided at the upper portion of the limestone powder bin, the feed port is connected to a feed pipe, and a dust collector is provided on the top of the limestone powder bin for removing dust generated when the limestone powder enters the limestone powder bin through the feed pipe.

[0014] Beneficial effects of the utility model:

[0015] When it is necessary to spray limestone powder into the circulating fluidized bed boiler for desulfurization, the limestone powder in the limestone powder bin is heated by an electric heating plate to prevent the limestone powder from getting damp and agglomerating. The heated limestone powder enters the discharge pipe through the discharge port of the discharge hopper, and the vibrator on the discharge pipe is started. The vibrator can continuously knock and vibrate the discharge pipe. With the coordinated use of the hoses at the upper and lower ends of the discharge pipe, the limestone powder in the discharge pipe is shaken and broken up, further preventing the limestone powder from agglomerating. Then, the discharge valve is opened to pass the heated and broken up limestone powder into the spraying mechanism, so that the limestone powder has better fluidity when sprayed to the circulating fluidized bed boiler by the spraying mechanism, thereby achieving a better flue gas desulfurization effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the internal structure of the limestone powder bin of the utility model;

[0018] The attached drawings are marked as follows:

[0019] Limestone powder silo 1, discharge hopper 11, discharge port 12, support legs 13, connecting rod 14, mounting seat 15, feed pipe 16, connecting pipeline 17, electric heating plate 2, vibration discharge mechanism 3, vibrator 31, hose 32, discharge pipe 33, discharge valve 34, blowing mechanism 4, air compressor 41, conveying pipeline 42, powder spraying nozzle 43, circulating fluidized bed boiler 5, dust collector 6. DETAILED DESCRIPTION

[0020] The following is a further detailed description of the implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0021] In the description of the present invention, unless otherwise specified, "multiple" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] Embodiment 1:

[0024] like Figure 1-2 As shown, a limestone feeding device for in-furnace desulfurization comprises a limestone powder bin 1, the bottom of which is connected to a discharge hopper 11, and a discharge port 12 is provided at the bottom of the discharge hopper 11;

[0025] An electric heating plate 2, wherein the electric heating plate 2 is disposed on the inner bottom wall of the discharge hopper 11; in other embodiments, the electric heating plate 2 may also be disposed on the inner side wall of the limestone powder bin 1;

[0026] A vibrating unloading mechanism 3, the vibrating unloading mechanism 3 comprises a vibrator 31, a hose 32, a unloading pipe 33 and a discharge valve 34;

[0027] The two hoses 32 are provided, and the two hoses 32 are respectively connected to the two ends of the discharge pipe 33. The discharge pipe 33 is vertically arranged below the limestone powder bin 1. The upper and lower ends of the discharge pipe 33 are respectively connected to the discharge port 12 of the discharge hopper 11 and the upper end of the discharge valve 34 through the hoses 32. The lower end of the discharge valve 34 is connected to the blowing mechanism 4 through the connecting pipe 17. The vibrator 31 is installed on the outer wall of the discharge pipe 33, and the vibrating end of the vibrator 31 abuts against the outer wall of the discharge pipe 33.

[0028] The discharge end of the spraying mechanism 4 is connected to a circulating fluidized bed boiler 5 , and the spraying mechanism 4 is used to spray limestone powder into the circulating fluidized bed boiler 5 .

[0029] In this embodiment, the vibrator 31 is a pipeline impact air hammer vibrator 31, which is a vibrator 31 of Jili Hydraulic and Pneumatic Technology Co., Ltd., model SK30; the discharge valve 34 is an anti-stuck and anti-blocking rotary discharge valve 34, model DN560; the hose 32 is a rubber bellows; in other embodiments, the unloading metering can be carried out by a screw conveyor.

[0030] As a preferred solution, the bottom circumferential array of the limestone powder silo 1 is provided with a plurality of support legs 13. The overall stability of the limestone powder silo 1 can be ensured by providing a plurality of support legs 13 in a circumferential array on the top circumferential array of the limestone powder silo 1. In this embodiment, four support legs 13 are provided.

[0031] As a preferred solution, a mounting frame is further provided on the support leg 13, and the mounting frame includes a connecting rod 14 and a mounting seat 15. Two connecting rods 14 are provided, and the two connecting rods 14 are fixedly connected to the outer side wall of the mounting seat 15. The outer ends of the two connecting rods 14 are fixedly connected to the support leg 13. The mounting seat 15 is located at the bottom of the discharge valve 34, and the discharge valve 34 is fixedly mounted on the mounting seat 15. By fixing the discharge valve 34 on the mounting seat 15, and fixing the mounting seat 15 on the support leg 13 through the connecting rod 14, the discharge valve 34 is limited and fixed to ensure the stability of the discharge valve 34 during discharge. In this embodiment, the upper end of the connecting pipe 17 is connected to the lower end of the discharge valve 34, and the lower end of the connecting pipe 17 passes through the mounting seat 15 downward and communicates with the upper side of the conveying pipe 42.

[0032] As a preferred solution, the spraying mechanism 4 includes an air compressor 41, a conveying pipeline 42 and a powder spraying nozzle 43; the air compressor 41 is arranged on one side of the limestone powder bin 1, the air outlet end of the air compressor 41 is connected to one end of the conveying pipeline 42, the conveying pipeline 42 is located below the limestone powder bin 1, the lower end of the unloading valve 34 is connected to the middle upper side of the conveying pipeline 42 through the connecting pipeline 17, and the other end of the conveying pipeline 42 penetrates the side wall of the circulating fluidized bed boiler 5 and extends into the circulating fluidized bed boiler 5 to communicate with the powder spraying nozzle 43. The compressed air is sprayed into the conveying pipeline 42 by the air compressor 41, the limestone powder in the conveying pipeline 42 is sprayed into the circulating fluidized bed boiler 5, and sprayed into the circulating fluidized bed boiler 5 through the powder spraying nozzle 43, which is convenient for desulfurization in the limestone furnace. The coordinated use of the air compressor 41, the conveying pipeline 42 and the powder spraying nozzle 43 can avoid the agglomeration of limestone powder to a certain extent.

[0033] As a preferred solution, a feed port is provided at the upper part of the limestone powder bin 1, and the feed port is connected to a feed pipe 16. A dust collector 6 is provided at the top of the limestone powder bin 1 to remove dust generated when the limestone powder enters the limestone powder bin 1 through the feed pipe 16. In this embodiment, the end of the feed pipe 16 away from the limestone powder bin 1 supplies limestone powder to the limestone powder bin 1 through a powder supply pump, and a certain amount of airflow is generated when the limestone powder is pneumatically transported to the limestone powder bin 1 by the powder supply pump, which needs to be removed from the limestone powder bin 1. Since a large amount of dust is carried in the airflow, the dust particles in the airflow can be removed by the dust collector 6.

[0034] The working mode of the utility model is as follows:

[0035] When in use, the limestone powder is transported to the limestone powder bin 1 through the feed pipe 16 of the limestone powder bin 1, and the dust particles in the air flow are removed by the dust collector 6, so that the limestone powder is stored in the limestone powder bin 1. When the limestone material needs to be sprayed into the circulating fluidized bed boiler 5 for desulfurization, the electric heating plate 2 is powered by an external power supply, so that the constant temperature heated electric heating plate 2 heats the limestone powder in the limestone powder bin 1 at a constant temperature to prevent the limestone powder from getting damp and agglomerating. The heated limestone powder enters the discharge pipe 33 through the discharge port 12 of the discharge hopper 11, and the vibrator 31 on the discharge pipe 33 is started. The vibrator 31 can continuously knock and vibrate the discharge pipe 33, and the upper and lower ends of the discharge pipe 33 are With the coordinated use of the hose 32, the limestone powder in the discharge pipe 33 is shaken and broken up, further avoiding the limestone powder from agglomerating. Then, the discharge valve 34 is opened to pass the heated and broken up limestone powder into the conveying pipe 42, so that the limestone powder has better fluidity in the conveying pipe 42. Compressed air is sprayed into the conveying pipe 42 through the air compressor 41, and the limestone powder in the conveying pipe 42 is sprayed toward the circulating fluidized bed boiler 5, and sprayed into the circulating fluidized bed boiler 5 through the powder spray nozzle 43, so as to facilitate the desulfurization in the limestone furnace. With the coordinated use of the air compressor 41, the conveying pipe 42 and the powder spray nozzle 43, the limestone powder can be avoided from agglomerating to a certain extent, so that the flue gas desulfurization effect is better.

[0036] The utility model is described in detail above. The description of the specific embodiments is only used to help understand the method and core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A limestone feeding device for furnace desulfurization, characterized in that: include A limestone powder bin (1), wherein the bottom of the limestone powder bin (1) is connected to a discharge hopper (11), and the bottom of the discharge hopper (11) is provided with a discharge port (12); An electric heating plate (2), wherein the electric heating plate (2) is arranged on the inner bottom wall of the discharge hopper (11); A vibrating unloading mechanism (3), the vibrating unloading mechanism (3) comprising a vibrator (31), a hose (32), a unloading pipe (33) and a discharge valve (34); Two hoses (32) are provided, and the two hoses (32) are respectively connected to the two ends of the discharge pipe (33). The discharge pipe (33) is vertically arranged below the limestone powder bin (1). The upper and lower ends of the discharge pipe (33) are respectively connected to the discharge port (12) of the discharge hopper (11) and the upper end of the discharge valve (34) through the hoses (32). The lower end of the discharge valve (34) is connected to the blowing mechanism (4). The vibrator (31) is installed on the outer wall of the discharge pipe (33), and the vibrating end of the vibrator (31) abuts against the outer wall of the discharge pipe (33). The discharge end of the spraying mechanism (4) is connected to a circulating fluidized bed boiler (5), and the spraying mechanism (4) is used to spray limestone powder into the circulating fluidized bed boiler (5).

2. The limestone feeding device for furnace desulfurization according to claim 1, characterized in that: The bottom of the limestone powder bin (1) is provided with a plurality of supporting legs (13) in a circumferential array.

3. The limestone feeding device for in-furnace desulfurization according to claim 2 is characterized in that: The support leg (13) is also provided with a mounting frame, the mounting frame comprising a connecting rod (14) and a mounting seat (15), two connecting rods (14) are provided, the two connecting rods (14) are fixedly connected to the outer side wall of the mounting seat (15), the outer ends of the two connecting rods (14) are fixedly connected to the support leg (13), the mounting seat (15) is located at the bottom of the discharge valve (34), and the discharge valve (34) is fixedly mounted on the mounting seat (15).

4. The limestone feeding device for furnace desulfurization according to claim 1, characterized in that: The spraying mechanism (4) comprises an air compressor (41), a conveying pipeline (42) and a powder spraying nozzle (43); the air compressor (41) is arranged on one side of the limestone powder bin (1); the air outlet end of the air compressor (41) is connected to one end of the conveying pipeline (42); the conveying pipeline (42) is located below the limestone powder bin (1); the lower end of the discharge valve (34) is connected to the upper middle side of the conveying pipeline (42); the other end of the conveying pipeline (42) passes through the side wall of the circulating fluidized bed boiler (5) and extends into the circulating fluidized bed boiler (5) to be connected to the powder spraying nozzle (43).

5. The limestone feeding device for in-furnace desulfurization according to claim 1, characterized in that: A feed port is provided at the top of the limestone powder bin (1), and the feed port is connected to a feed pipe (16). A dust collector (6) is provided at the top of the limestone powder bin (1) for removing dust generated when the limestone powder enters the limestone powder bin (1) through the feed pipe (16).

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