A kiln tail gas integrated treatment device for sodium silicate production

Abstract

The utility model relates to the technical field of sodium silicate production, and concretely relates to a kiln tail gas integrated processing device for sodium silicate production, which comprises a processing chamber, a fixed plate is arranged in the processing chamber to separate the upper part of the processing chamber, a filter tube is arranged on one side of the fixed plate facing the air inlet pipe, an SCR catalyst is loaded on the inner wall or surface of the filter tube, and a spray plate two is arranged in the flue upstream of the filter tube to spray a reducing agent. The utility model loads the SCR catalyst in the form of a coating on the inner wall or surface of the filter tube, and a spray plate two is arranged upstream of the filter tube unit. When the dust-containing tail gas passes through the filter tube and is purified, the NOx in the tail gas and the sprayed reducing agent react under the action of the catalyst to generate harmless N2 and H2O. This achieves the cooperation and synchronization of dust removal and denitration in one physical space, thereby improving the processing efficiency.

Description

Technical Field

[0001] This utility model relates to the field of sodium silicate production technology, and specifically to an integrated kiln exhaust gas treatment device for sodium silicate production. Background Technology

[0002] Sodium silicate is typically produced using a dry process kiln, with soda ash and quartz sand as raw materials, which are melted and reacted at 1300-1400℃.

[0003] However, the production of sodium silicate produces acidic kiln exhaust gas, and the sulfur in the fuel produces SO2 after combustion. Nitrogen in the air will generate NOx at high temperatures, causing air pollution. Utility Model Content

[0004] The purpose of this invention is to treat the acidic tail gas generated in sodium silicate production, and to provide an integrated treatment device for kiln tail gas in sodium silicate production, which has a compact structure and high treatment efficiency.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] An integrated kiln exhaust gas treatment device for sodium silicate production includes a treatment chamber. An air inlet pipe is provided on one side of the upper part of the treatment chamber. A fixed plate is provided inside the treatment chamber to separate the upper part of the treatment chamber. A filter tube is provided on the side of the fixed plate facing the air inlet pipe. The inside or surface of the filter tube is loaded with an SCR catalyst. A jet plate is provided in the flue upstream of the filter tube for spraying a reducing agent. An exhaust pipe is connected to the top of the treatment chamber. The exhaust pipe and the air inlet pipe are located on opposite sides of the fixed plate.

[0007] Preferably, the porosity of the filter tube is set to 85%-95%.

[0008] Preferably, the pore size of the filter tube is set to 20-50 μm.

[0009] Preferably, the loading of SCR catalyst on the filter tube is set to 50-150 g / m³. 2 .

[0010] Preferably, a spray plate is provided on the side of the fixing plate facing the air intake pipe for spraying cooling water, the spray plate being located above the air intake pipe, and a perforated plate is provided on the side of the fixing plate facing the air intake pipe, the perforated plate being located below the air intake pipe.

[0011] Preferably, a support plate is provided on the side of the fixing plate facing the air inlet pipe, and a dust removal mechanism is provided on the support plate for primary separation. The dust removal mechanism is located above the filter tube and below the porous plate.

[0012] Preferably, the dust removal mechanism comprises multiple small cyclones connected in parallel.

[0013] Preferably, a spray plate three is provided on the side of the fixing plate facing the air inlet pipe for spraying alkaline absorbent liquid, and the spray plate three is located below the filter tube.

[0014] Preferably, a swirl plate is provided below the jet plate three to increase the contact area and mixing intensity of the gas and liquid phases, and the swirl plate is provided on the fixed plate.

[0015] Compared with the prior art, this utility model loads the SCR catalyst in the form of a coating on the inside or surface of the filter tube. At the same time, a second spray plate is provided upstream of the filter tube unit. When the dust-laden exhaust gas passes through the filter tube and is purified, the NOx in the exhaust gas and the injected reducing agent undergo a reduction reaction under the action of the catalyst to generate harmless N2 and H2O. This achieves the synergistic and synchronous completion of "dust removal" and "denitrification" in one physical space, thereby improving the treatment efficiency. Attached Figure Description

[0016] The disclosure of this utility model is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings, the same reference numerals are used to refer to the same parts.

[0017] in:

[0018] Figure 1 This is a cross-sectional structural diagram of the present invention;

[0019] Figure 2 This is a schematic diagram of the structure of the perforated plate of this utility model;

[0020] Figure 3 This is a schematic diagram of the structure of the cyclone dust collector of this utility model;

[0021] Figure 4 This is a schematic diagram of the structure of the filter tube of this utility model;

[0022] Figure 5 This is a schematic diagram of the structure of the swirl plate of this utility model.

[0023] The diagram shows the following labels: 1. Processing chamber; 2. Air inlet pipe; 3. Sewage outlet pipe; 4. Air outlet pipe; 5. Spray plate one; 6. Perforated plate; 7. Support plate; 8. Dust removal mechanism; 9. Spray plate two; 10. Filter tube; 11. Spray plate three; 12. Swirl plate; 13. Fixing plate. Detailed Implementation

[0024] It is readily understood that, based on the technical solution of this utility model, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of this utility model. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model and should not be considered as the entirety of this utility model or as limitations or restrictions on the technical solution of this utility model.

[0025] like Figure 1 As shown in the figure, as a specific embodiment of the integrated kiln exhaust gas treatment device for sodium silicate production provided by this utility model, it includes a treatment chamber 1. An air inlet pipe 2 is provided on one side of the upper part of the treatment chamber 1. The air inlet pipe 2 is used to connect to the kiln flue and introduce high-temperature exhaust gas of 400-600℃ into the treatment chamber 1. A fixing plate 13 is provided on the top of the treatment chamber 1. The fixing plate 13 is spaced from the bottom of the treatment chamber 1. The fixing plate 13 separates the upper part of the treatment chamber 1 into a treatment area and a discharge area. The air inlet pipe 2 introduces the exhaust gas into the treatment area of ​​the treatment chamber 1. An exhaust pipe 4 is connected to the top of the treatment chamber 1. The exhaust pipe 4 is located at the top of the discharge area and is used to discharge the treated clean gas.

[0026] like Figure 1 , 2 As shown, the fixed plate 13, facing the processing area, is equipped with a jet plate 5, a perforated plate 6, a support plate 7, a dust removal mechanism 8, a jet plate 9, a filter tube 10, a jet plate 11, and a swirl plate 12 from top to bottom. The jet plate 5 is located above the air inlet pipe 2. It precisely atomizes and sprays cooling water or alkaline absorbent into the high-temperature exhaust gas. The exhaust gas is instantly cooled to 150-200°C through water evaporation, avoiding damage to subsequent equipment due to excessively high exhaust gas temperature. The perforated plate 6 is located below the air inlet pipe 2. It makes the airflow and temperature field distribution that may be uneven after rapid cooling uniform and stable, creating stable conditions for subsequent processes.

[0027] like Figure 3 As shown, the dust removal mechanism 8 is installed on the support plate 7. The dust removal mechanism 8 includes multiple small cyclones connected in parallel. It uses centrifugal force to perform primary separation of large particles and high-concentration dust in the exhaust gas after rapid cooling, removing about 80% of the dust load. In addition, the collected coarse dust can be discharged periodically.

[0028] like Figure 4As shown, the filter tube 10 has an SCR catalyst loaded inside or on its surface, such as a manganese-based (MnOx) catalyst or its composite oxide catalyst. The spray plate 9 is set in the flue upstream of the filter tube 10. The spray plate 9 is used to spray a reducing agent, such as ammonia or atomized urea solution, to capture the remaining submicron fine particles in the gas after primary dust removal. The dust removal efficiency is >99.9%. When the dust-laden exhaust gas passes through the filter tube 10 and is purified, the NOx in the exhaust gas reacts with the reducing agent sprayed by the spray plate 9 under the action of the catalyst to generate harmless N2 and H2O. By loading the SCR catalyst onto the filter tube 10, the final dust capture and NOx catalytic reduction are completed simultaneously in one unit, simplifying the process and improving the denitrification efficiency.

[0029] In addition, a pulse cleaning device can be installed on the upper or side of the filter tube 10 to periodically and alternately spray high-pressure pulse air into the filter tube 10 to blow off the dust cake attached to the outer surface of the filter tube 10 and keep the filter tube 10 unobstructed for a long time.

[0030] like Figure 5 As shown, the spray plate 11 is used to spray alkaline absorbent liquid, such as lime milk or NaOH solution. The swirl plate 12 greatly increases the contact area and mixing intensity of the gas and liquid phases, and efficiently removes SO2. A drain pipe 3 is provided on one side of the bottom of the treatment chamber 1 for periodically discharging the generated waste slurry and collected ash residue.

[0031] The filter tube 10 is made of corrosion-resistant and high-temperature-resistant ceramic fiber. The porosity of the filter tube 10 is set at 85%-95%. This high porosity ensures extremely low initial resistance and a large internal surface area, providing ample space for deep dust filtration and catalyst loading. Below 85%, the resistance would be too high, while above 95%, the mechanical strength would significantly decrease. The pore size of the filter tube 10 is set at 20-50 μm. This pore size range allows gas to pass through while effectively intercepting most dust particles. The SCR catalyst loading on the filter tube 10 is set at 50-150 g / m³. 2 This range ensures sufficient catalytic reaction active sites without affecting the permeability and dust removal effect of filter tube 10.

[0032] During operation, the kiln exhaust gas enters the treatment chamber 1 through the inlet pipe 2. It is first cooled by the spray plate 5, and the cooled, uniform airflow enters the dust removal mechanism 8 through the perforated plate 6, where most of the coarse particles are removed. The gas then enters the filter tube 10, where fine particles are thoroughly filtered and captured. At the same time, the reducing agent sprayed by the spray plate 9 mixes with the gas. When it flows through the filter tube 10 covered with an SCR catalyst, NOx is catalytically reduced to N2. At this point, the gas has completed dust removal and denitrification. Subsequently, the gas flows downward and mixes violently with the alkaline absorbent sprayed by the spray plate 11 under the action of the swirl plate 12. SO2 is absorbed and removed, and the purified gas is discharged through the outlet pipe 4.

[0033] The technical scope of this utility model is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the protection scope of this utility model.

Claims

1. An integrated kiln exhaust gas treatment device for sodium silicate production, characterized in that: The system includes a processing chamber (1), an air inlet pipe (2) is provided on one side of the upper part of the processing chamber (1), a fixing plate (13) is provided inside the processing chamber (1) to separate the upper part of the processing chamber (1), a filter pipe (10) is provided on the side of the fixing plate (13) facing the air inlet pipe (2), the inside or surface of the filter pipe (10) is loaded with an SCR catalyst, a jet plate (9) is provided in the flue upstream of the filter pipe (10) to spray a reducing agent, and an exhaust pipe (4) is connected to the top of the processing chamber (1), the exhaust pipe (4) and the air inlet pipe (2) are respectively located on both sides of the fixing plate (13).

2. The integrated kiln tail gas treatment device for sodium silicate production according to claim 1, characterized in that: The porosity of the filter tube (10) is set to 85%-95%.

3. The integrated kiln tail gas treatment device for sodium silicate production according to claim 1, characterized in that: The pore size of the filter tube (10) is set to 20-50 μm.

4. The integrated kiln tail gas treatment device for sodium silicate production according to claim 1, characterized in that: The loading of SCR catalyst on the filter tube (10) is set to 50-150 g / m³. 2 .

5. The integrated kiln tail gas treatment device for sodium silicate production according to claim 1, characterized in that: The fixing plate (13) is provided with a spray plate (5) on the side facing the air intake pipe (2) for spraying cooling water. The spray plate (5) is located above the air intake pipe (2). The fixing plate (13) is provided with a perforated plate (6) on the side facing the air intake pipe (2). The perforated plate (6) is located below the air intake pipe (2).

6. The integrated kiln tail gas treatment device for sodium silicate production according to claim 5, characterized in that: The fixed plate (13) is provided with a support plate (7) on the side facing the air inlet pipe (2). The support plate (7) is provided with a dust removal mechanism (8) for primary separation. The dust removal mechanism (8) is located above the filter pipe (10) and below the porous plate (6).

7. The integrated kiln exhaust gas treatment device for sodium silicate production according to claim 6, characterized in that: The dust removal mechanism (8) includes multiple small cyclones connected in parallel.

8. The integrated kiln tail gas treatment device for sodium silicate production according to claim 1, characterized in that: The fixing plate (13) is provided with a spray plate three (11) on the side facing the air inlet pipe (2) for spraying alkaline absorption liquid. The spray plate three (11) is located below the filter pipe (10).

9. The integrated kiln tail gas treatment device for sodium silicate production according to claim 8, characterized in that: A swirl plate (12) is provided below the jet plate (11) to increase the contact area and mixing intensity of the gas and liquid phases. The swirl plate (12) is provided on the fixed plate (13).

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