In-furnace desulfurization, denitrification and dephosphorization device for high-sulfur yellow phosphorus tail gas boiler flue gas

Abstract

The utility model discloses an in-furnace desulfurization, denitrification and dephosphorization device for flue gas of a high-sulfur yellow phosphorus tail gas boiler, relates to the technical field of flue gas treatment of yellow phosphorus tail gas boilers, and solves the problems that in the existing process of removing sulfur-containing impurities in the flue gas of the boiler after combustion of yellow phosphorus tail gas, the removal efficiency is low; in order to solve the technical problems that in the prior art, in the prior art, a desulfurization tower is arranged in the desulfurization tower, solid particles generated in the desulfurization process can cause scaling or blocking in equipment, and normal operation of a system is affected, the desulfurization tower comprises the desulfurization tower, a first air inlet is formed in the desulfurization tower, a plurality of first nozzles are arranged in the desulfurization tower, and two of the first nozzles are arranged on the upper side and the lower side of the first air inlet; the utility model relates to a desulfurization tower, in particular to a desulfurization tower, which aims to quickly reduce the temperature of sulfur-containing flue gas sprayed from the first nozzles by arranging first nozzles on the upper side and the lower side of a first gas inlet of the desulfurization tower and spraying out water mist, and quick lime in slaked lime can be thoroughly reacted by the mist sprayed from the first nozzles, so that the utilization efficiency of the slaked lime is improved; and water mist sprayed by the first nozzles can wash slaked lime attached to the interior of the desulfurization tower.

Description

Technical Field

[0001] This utility model belongs to the field of flue gas treatment technology for yellow phosphorus tail gas boilers, specifically relating to an in-furnace desulfurization, denitrification, and dephosphorization device for high-sulfur yellow phosphorus tail gas boiler flue gas. Background Technology

[0002] Yellow phosphorus tail gas is a byproduct generated by electric furnaces during the production of yellow phosphorus. Its main components include phosphine (PH3), hydrogen sulfide (H2S), sulfur dioxide (SO2), elemental phosphorus (P), and carbon monoxide (CO). Due to its high calorific value, production units often recover it for use as boiler fuel gas to achieve energy recycling. However, impurities such as sulfur, nitrogen, and phosphorus in yellow phosphorus tail gas transform into harmful pollutants during combustion, such as sulfates, nitrogen oxides, and phosphates. These substances pose potential hazards to the environment and human health; therefore, various countries... Strict emission standards have been imposed on boiler flue gas, requiring deep purification of yellow phosphorus tail gas. Traditional desulfurization technologies mainly include wet desulfurization, dry desulfurization, and semi-dry desulfurization. Wet desulfurization typically uses limestone or slaked lime as an absorbent to remove SO2 through a wet scrubbing tower. Denitrification technologies are mainly divided into selective catalytic reduction (SCR), selective non-catalytic reduction (SNCR), and adsorption methods. Dephosphorization technologies usually involve chemical precipitation, which utilizes certain chemicals to react with phosphorus to generate insoluble precipitates, thereby achieving phosphorus removal.

[0003] However, existing methods for removing sulfur-containing impurities from yellow phosphorus tail gas are prone to low removal efficiency, and the solid particles generated during the desulfurization process can cause scaling or blockage in the equipment, affecting the normal operation of the system. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides an in-furnace desulfurization, denitrification, and dephosphorization device for high-sulfur and yellow phosphorus tail gas boiler flue gas.

[0005] The technical solution adopted in this utility model is as follows:

[0006] An in-furnace desulfurization, denitrification, and dephosphorization device for high-sulfur and yellow phosphorus tail gas boiler flue gas includes a desulfurization tower with a first air inlet. The desulfurization tower is equipped with several first nozzles inside, two of which are located on the upper and lower sides of the first air inlet.

[0007] By adopting the above technical solution, first nozzles are set on the upper and lower sides of the first air inlet of the desulfurization tower. The first nozzles spray water mist, thereby rapidly reducing the temperature of the sulfur-containing flue gas sprayed at the first nozzle. In addition, the mist sprayed at the first nozzle will cause the quicklime in the slaked lime to react completely, improving the utilization efficiency of the slaked lime. The water mist sprayed from the first nozzle can wash away the slaked lime adhering to the inside of the desulfurization tower.

[0008] Preferably, the desulfurization tower is connected to a first channel for inputting quicklime, and the end of the first channel is connected to the interior of the desulfurization tower through a nozzle.

[0009] Using the above technical solution, the first channel is used to input quicklime, and the nozzle can spray the quicklime out.

[0010] Preferably, the desulfurization tower is further provided with a fixing plate inside, and the fixing plate is provided with several second nozzles.

[0011] Using the above technical solution, a second nozzle is set on the fixed plate. The second nozzle is used to spray a gas flow, thereby fully dispersing the quicklime powder and mixing it with the sulfur-containing flue gas for a full reaction.

[0012] Preferably, there are two fixing plates, and the two fixing plates are respectively hinged to the inner wall of the desulfurization tower via a rotating shaft.

[0013] Using the above technical solution, after the quicklime has fully reacted with the sulfur-containing flue gas, the waste quicklime needs to be discharged. At this time, the fixed plate is opened by rotating the shaft, and the quicklime is discharged through the bottom slag discharge port of the desulfurization tower.

[0014] Preferably, an anti-sticking layer is provided on the inner wall of the desulfurization tower.

[0015] By adopting the above technical solution, the anti-sticking layer further avoids the problem of scale or blockage in the equipment caused by solid particles generated during the desulfurization process.

[0016] Preferably, the device further includes a power generation boiler, a buffer assembly, and a first dust removal assembly connected in sequence, wherein the air outlet of the first dust removal assembly is connected to the first air inlet of the desulfurization tower via a pipeline.

[0017] Using the above technical solution, after the power generation boiler generates electricity, it discharges sulfur-containing flue gas. The buffer component regulates the temperature of the sulfur-containing flue gas to prevent it from overheating. The first dust removal component removes dust from the sulfur-containing flue gas. The sulfur-containing flue gas after preliminary dust removal is then introduced into the desulfurization tower.

[0018] Preferably, the outlet of the desulfurization tower is connected in sequence to a second dust removal component and an exhaust tower via a pipeline.

[0019] Using the above technical solution, the second dust removal component is used to thoroughly remove dust from the flue gas discharged from the desulfurization tower, and finally it is discharged into the exhaust tower.

[0020] Preferably, the lower part of the buffer assembly is provided with a slag outlet.

[0021] Using the above technical solution, the slag outlet is used to discharge the ash and slag that falls from the buffer assembly.

[0022] Preferably, a third nozzle and a fourth nozzle are respectively provided on the side wall of the power generation boiler; a second air inlet is also provided on the side wall at the bottom of the power generation boiler.

[0023] Using the above technical solution, limestone powder and urea are injected into the third and fourth nozzles respectively for dephosphorization and desulfurization.

[0024] Preferably, a separator is connected between the power generation boiler and the buffer assembly via a pipe, and the bottom of the separator is connected to the side wall of the power generation boiler via a second channel.

[0025] Using the above technical solution, the separator is used to separate the coal gangue introduced into the power generation boiler. The coal gangue passes through the separator, and the larger particles continue to enter the power generation boiler for dephosphorization through the second channel. The smaller particles, i.e. fine particles, enter the downstream flue gas treatment system after being pretreated by the dust collector, i.e., the second stage of desulfurization is carried out in the desulfurization tower.

[0026] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0027] 1. By setting first nozzles on the upper and lower sides of the first air inlet of the desulfurization tower, water mist is sprayed from the first nozzles, thereby rapidly reducing the temperature of the sulfur-containing flue gas sprayed from the first nozzles. In addition, the mist sprayed from the first nozzles will cause the quicklime in the slaked lime to react completely, thereby improving the utilization efficiency of the slaked lime. The water mist sprayed from the first nozzles can wash away the slaked lime adhering to the inside of the desulfurization tower.

[0028] 2. Due to differences in phosphate rock origin and harmful element content, the sulfur content in yellow phosphorus tail gas varies widely and fluctuates greatly. Furthermore, the operating time of yellow phosphorus electric furnaces is affected to varying degrees by electricity prices in different provinces across the country. This indicates that the utilization of yellow phosphorus tail gas cannot achieve stable operation like traditional gas-fired power plants or chemical plants with stable raw material sources. Desulfurization devices are difficult to operate stably and effectively. This application can adjust the desulfurization device according to the actual production situation of yellow phosphorus tail gas, so as to achieve stable operation of the desulfurization device, enabling the resource utilization of yellow phosphorus tail gas, while also obtaining a more stable and effective treatment method for the generated waste gas. Attached Figure Description

[0029] This utility model will be described by way of example and with reference to the accompanying drawings, wherein:

[0030] Figure 1 This is a schematic diagram of the in-furnace desulfurization, denitrification, and dephosphorization device for high-sulfur and high-phosphorus tail gas boiler flue gas according to this utility model.

[0031] Figure 2 This is a schematic diagram of the desulfurization tower in this utility model;

[0032] Figure 3 This is a utility model Figure 2 Enlarged structural diagram of part A in the middle.

[0033] Figure Labels

[0034] 1-Desulfurization tower, 2-First air inlet, 3-Air outlet, 4-First nozzle, 5-First channel, 6-Spray head, 7-Fixing plate, 8-Second nozzle, 9-Rotating shaft, 10-Anti-sticking layer, 11-Power generation boiler, 12-Third nozzle, 13-Fourth nozzle, 14-Separator, 15-Second channel, 16-Second air inlet, 17-Buffer assembly, 18-Slag outlet, 19-First dust removal assembly, 20-Second dust removal assembly, 21-Exhaust tower. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. The components of the embodiments of this application described and marked in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0036] In the description of the embodiments of this application, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0037] The following is combined with Figures 1-3 This utility model will be described in detail.

[0038] An in-furnace desulfurization, denitrification, and dephosphorization device for high-sulfur, yellow phosphorus tail gas boiler flue gas, refer to the attached document. Figure 1The system includes a desulfurization tower 1, which is provided with a first air inlet 2. Several first nozzles 4 are provided inside the desulfurization tower 1, with two of the first nozzles 4 located on the upper and lower sides of the first air inlet 2. By providing first nozzles 4 on the upper and lower sides of the first air inlet 2 of the desulfurization tower 1, the first nozzles 4 spray water mist, thereby rapidly reducing the temperature of the sulfur-containing flue gas sprayed from the first nozzles 4. Furthermore, the mist sprayed from the first nozzles 4 will cause the quicklime in the slaked lime to react completely, improving the utilization efficiency of the slaked lime. The water mist sprayed from the first nozzles 4 can wash away the slaked lime adhering to the inside of the desulfurization tower 1.

[0039] The first air inlet 2 is used to introduce sulfur-containing flue gas.

[0040] The first nozzle 4 is connected to the water source through a pipe, and a water pump is also installed on the pipe.

[0041] In this embodiment, the desulfurization tower 1 is connected to a first channel 5 for inputting quicklime, and the end of the first channel 5 is connected to the interior of the desulfurization tower 1 through a nozzle 6; the first channel 5 is used to input quicklime, and the nozzle 6 can spray the quicklime out.

[0042] The first end of the first channel 5 is connected to the quicklime powder supply end, and the nozzle 6 is also connected to a booster pump.

[0043] In this embodiment, a fixing plate 7 is also provided inside the desulfurization tower 1, and several second nozzles 8 are provided on the fixing plate 7; by providing second nozzles 8 on the fixing plate 7, the second nozzles 8 are used to spray gas flow, thereby fully dispersing the quicklime powder and mixing it with the sulfur-containing flue gas for full reaction.

[0044] Several second nozzles 8 are connected to the air pump via pipes and universal joints.

[0045] In this embodiment, refer to the appendix. Figure 2 There are two fixing plates 7, and the two fixing plates 7 are respectively hinged to the inner wall of the desulfurization tower 1 through the rotating shaft 9. After the quicklime reacts fully with the sulfur-containing flue gas, the waste quicklime needs to be discharged. At this time, the fixing plate 7 is opened by rotating the rotating shaft 9, and the quicklime is discharged through the bottom slag discharge port of the desulfurization tower 1.

[0046] In this embodiment, an anti-sticking layer 10 is provided on the inner wall of the desulfurization tower 1; the anti-sticking layer 10 further avoids the problem of scale or blockage caused by solid particles generated during the desulfurization process.

[0047] In this embodiment, refer to the appendix. Figure 3The device also includes a power generation boiler 11, a buffer assembly 17, and a first dust removal assembly 19 connected in sequence by pipes. The air outlet of the first dust removal assembly 19 is connected to the first air inlet 2 of the desulfurization tower 1 through a pipe. After the power generation boiler 11 generates electricity, it discharges sulfur-containing flue gas. The buffer assembly 17 regulates the temperature of the sulfur-containing flue gas to prevent it from overheating. The first dust removal assembly 19 removes dust from the sulfur-containing flue gas. The sulfur-containing flue gas after preliminary dust removal is introduced into the desulfurization tower 1.

[0048] Among them, the buffer assembly 17 adopts a containment tower, and the containment tower contains, from top to bottom, a high-temperature superheater, a low-temperature superheater and several air preheaters;

[0049] The first dust removal component 19 uses an electrostatic precipitator.

[0050] The upper part of the power generation boiler 11 is also connected to a feed inlet for coal gangue.

[0051] In this embodiment, the outlet 3 of the desulfurization tower 1 is connected to the second dust removal component 20 and the exhaust tower 21 in sequence through a pipeline; the second dust removal component 20 is used to thoroughly remove dust from the flue gas discharged from the desulfurization tower 1, and finally it is discharged into the exhaust tower 21.

[0052] The second dust removal component 20 is a bag filter.

[0053] In this embodiment, the lower part of the buffer assembly 17 is provided with a slag outlet 18; the slag outlet 18 is used to discharge the ash and slag that fall from the buffer assembly 17.

[0054] In this embodiment, a third nozzle 12 and a fourth nozzle 13 are respectively provided on the side wall of the power generation boiler 11; a second air inlet 16 is also provided on the side wall at the bottom of the power generation boiler 11; limestone powder and urea are sprayed into the third nozzle 12 and the fourth nozzle 13 respectively for dephosphorization and desulfurization.

[0055] The third nozzle 12 is connected to the limestone powder via a pipe, and a high-pressure pump is installed on the pipe.

[0056] The fourth nozzle 13 is connected to the urea supply pipeline, and a high-pressure pump is installed on the pipeline.

[0057] In this embodiment, a separator 14 is connected between the power generation boiler 11 and the buffer assembly 17 via a pipe. The bottom of the separator 14 is connected to the side wall of the power generation boiler 11 via a second channel 15. The separator 14 is used to separate the coal gangue introduced into the power generation boiler 11. After passing through the separator 14, the larger particles of the coal gangue continue to enter the power generation boiler 11 through the second channel 15 for dephosphorization, while the smaller particles, i.e., fine particles, enter the downstream flue gas treatment system after being pretreated by the dust collector, i.e., the second stage of desulfurization is carried out in the desulfurization tower 1.

[0058] Among them, the separator 14 is a cyclone separator 14.

[0059] Working principle and usage process:

[0060] After generating electricity, the power boiler 11 discharges sulfur-containing flue gas. A buffer assembly 17 regulates the temperature of the sulfur-containing flue gas to prevent overheating. The buffer assembly 17 uses a containment tower, which contains, from top to bottom, a high-temperature superheater, a low-temperature superheater, and several air preheaters. A first dust removal assembly 19 removes dust from the sulfur-containing flue gas. The flue gas, after preliminary dust removal, is then introduced into the desulfurization tower 1. A separator 14 separates the coal gangue introduced into the power boiler 11. Larger particles of the coal gangue pass through the separator 14 and continue into the power boiler 11 through a second channel 15 for dephosphorization. Smaller particles, i.e., fine particulate matter, are pre-treated by the dust collector and then enter the downstream flue gas treatment system, i.e., undergo a second stage of desulfurization in the desulfurization tower 1. The desulfurization tower 1 is equipped with several first nozzles 4, two of which are located on the upper and lower sides of the first air inlet 2. First nozzles 4 are installed on both the upper and lower sides of the first air inlet 2 of the desulfurization tower 1. The first nozzles 4 spray water mist, thereby quickly reducing the temperature of the sulfur-containing flue gas sprayed from the first nozzles 4. The mist sprayed from the first nozzles 4 will cause the quicklime in the slaked lime to react completely, improving the utilization efficiency of the slaked lime. The water mist sprayed from the first nozzles 4 can wash away the slaked lime adhering to the inside of the desulfurization tower 1. A second nozzle 8 is installed on the fixed plate 7. The second nozzle 8 is used to spray gas flow, thereby fully dispersing the slaked lime powder and mixing it with the sulfur-containing flue gas for a full reaction. After the slaked lime and the sulfur-containing flue gas have fully reacted, the waste slaked lime needs to be discharged. At this time, the fixed plate 7 is opened by rotating the shaft 9, and the slaked lime is discharged through the bottom slag discharge port of the desulfurization tower 1. The second dust removal component 20 is used to thoroughly remove dust from the flue gas discharged from the desulfurization tower 1, and finally it is introduced into the exhaust tower 21 for venting.

[0061] It should be noted that:

[0062] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A device for in-furnace desulfurization, denitrification and dephosphorization of high-sulfur, high-phosphorus tail gas boiler flue gas, characterized in that, Including desulfurization tower (1), first air inlet (2) is arranged on the desulfurization tower (1), the inside of desulfurization tower (1) is provided with a plurality of first nozzle (4), wherein two first nozzle (4) are arranged on the upper and lower sides of first air inlet (2); The device further includes a power generation boiler (11), a buffer assembly (17), and a first dust removal assembly (19) connected in sequence, and the air outlet of the first dust removal assembly (19) is communicated with the first air inlet (2) of the desulfurization tower (1) through a pipeline; The side wall of the power generation boiler (11) is respectively provided with a third nozzle (12) and a fourth nozzle (13), and the side wall of the bottom of the power generation boiler (11) is further provided with a second air inlet (16).

2. The device according to claim 1, characterized in that, The desulfurization tower (1) is connected with a first channel (5) for inputting slaked lime, and the end of the first channel (5) is communicated with the inside of the desulfurization tower (1) through a spray head (6).

3. The device according to claim 1, characterized in that, The inside of the desulfurization tower (1) is further provided with a fixed plate (7), and the fixed plate (7) is provided with a plurality of second nozzles (8).

4. The device according to claim 3, characterized in that, The fixed plate (7) is provided with two, and the two fixed plates (7) are respectively hinged to the inner wall of the desulfurization tower (1) through a rotating shaft (9).

5. The device according to claim 3, characterized in that, The inner wall of the desulfurization tower (1) is provided with an anti-sticking layer (10).

6. The device according to claim 1, characterized in that, The air outlet (3) of the desulfurization tower (1) is sequentially communicated with a second dust removal assembly (20) and an emptying tower (21) through a pipeline.

7. The device according to claim 1, characterized in that, The lower part of the buffer assembly (17) is provided with a slag outlet (18).

8. The device according to claim 1, characterized in that, The power generation boiler (11) and the buffer assembly (17) are connected through a pipeline, and a separator (14) is arranged between the power generation boiler (11) and the buffer assembly (17), and the bottom of the separator (14) is connected with the side wall of the power generation boiler (11) through a second channel (15).

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