Flat plate type SCR catalyst drying and calcining device

Abstract

The utility model discloses a flat plate type SCR (Selective Catalytic Reduction) catalyst drying and calcining device which comprises a drying area, a calcining area and a cooling area, the drying area, the calcining area and the cooling area are provided with a conveying mechanism, a catalyst unit is vertically placed on the conveying mechanism to be conveyed, and air conveying pipelines are arranged above and below the catalyst unit in the drying area, the calcining area and the cooling area. An S-shaped channel is formed by air delivery pipelines of the drying area, the calcining area and the cooling area and a vertically arranged catalyst unit, an inlet air delivery pipeline of the drying area is connected with an outlet air delivery pipeline of the cooling area through a temperature adjusting pipeline, a first fan and a temperature adjusting box are arranged on the temperature adjusting pipeline, and the temperature adjusting box is connected with a natural air pipeline; the inlet air conveying pipeline and the outlet air conveying pipeline of the calcining area are connected through a temperature rising pipeline, a second fan and a temperature rising box are arranged on the temperature rising pipeline, and a heater is arranged in the temperature rising box. The utility model solves the problems of high equipment manufacturing cost, large energy consumption, complex process and the like in the existing flat plate type SCR catalyst field.

Description

Technical Field

[0001] This utility model relates to the field of catalyst technology, specifically to a flat-plate SCR catalyst drying and calcination device. Background Technology

[0002] In recent years, with increasing global emphasis on environmental protection and sustainable development, the requirements for industrial flue gas emissions have become increasingly stringent. This is especially true in my country, where rapid economic development has led to increased investment and stronger regulation of the environmental protection industry.

[0003] SCR (Selective Catalytic Reduction) denitrification technology is an effective flue gas denitrification technology. Through the action of a catalyst, nitrogen oxides in flue gas are reduced to nitrogen gas, thereby reducing pollutant emissions. The catalyst is the core of SCR denitrification technology, and its performance and quality directly affect the denitrification effect.

[0004] Currently, the mainstream technologies for preparing plate-type denitrification catalysts, both domestically and internationally, employ conventional calcination kilns to dry and calcine the catalysts to achieve their specific structures and properties. However, due to limitations in equipment and process technology, the drying and calcination equipment for producing plate-type SCR catalysts is expensive, energy-intensive, and involves complex processes, resulting in significant energy waste and high production costs.

[0005] Therefore, in order to improve my country's competitiveness in the production of SCR denitrification catalysts, it is necessary to design new drying and calcination equipment for plate-mounted SCR catalysts to solve the aforementioned problems existing in the drying and calcination equipment for existing plate-mounted SCR catalysts. Utility Model Content

[0006] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a flat plate SCR catalyst drying and calcination device, which can solve the problems of high equipment cost, high energy consumption and complex process in the field of domestic flat plate SCR catalyst.

[0007] The technical solution of this utility model is as follows:

[0008] A flat-plate SCR catalyst drying and calcination device includes a drying zone, a calcination zone, and a cooling zone. Each zone is equipped with a conveying mechanism on which the catalyst unit is vertically placed and conveyed. Air ducts are located above and below the catalyst units in the drying, calcination, and cooling zones, forming an S-shaped channel with the vertically placed catalyst units. The inlet air duct of the drying zone is connected to the outlet air duct of the cooling zone via a temperature-regulating pipe. A fan and a temperature-regulating box are installed on the temperature-regulating pipe, which is connected to a natural air duct. The inlet and outlet air ducts of the calcination zone are connected via a heating pipe. A fan and a heating box are installed on the heating pipe, which contains a heater.

[0009] Preferably, except for the inlet and outlet air ducts of the drying zone, calcination zone, and cooling zone, the remaining air ducts are arc-shaped ducts.

[0010] Preferably, the heating pipe is connected to an exhaust gas discharge pipe.

[0011] Preferably, regulating valves are installed on the heating pipe and the exhaust pipe respectively.

[0012] Preferably, the natural air duct is equipped with a regulating valve.

[0013] Preferably, temperature sensors are installed inside the temperature control chamber and the temperature riser chamber.

[0014] Preferably, the air duct is covered with a shell, and an insulation layer is provided between the shell and the air duct.

[0015] Preferably, the conveying mechanism is a conveyor belt.

[0016] Compared with the prior art, this utility model has the following advantages:

[0017] This invention utilizes only two fans and requires only one heat source. Multiple heat sources, such as gas burners and electric heaters, can be selected based on the factory's favorable conditions, maximizing waste heat utilization. The vertically placed flat-plate SCR catalyst unit of this invention, compared to a horizontal placement, can increase production capacity by more than 30% at the same volume and conveying speed. This invention's device boasts significant advantages, including simple structure, multi-functional integration, small footprint, low equipment cost, high productivity, and low maintenance and production costs. It greatly reduces equipment costs and catalyst production costs, solving the problems of high equipment cost, high energy consumption, and complex processes in the field of domestically produced flat-plate SCR catalysts. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the flat-plate SCR catalyst drying and calcination device of this utility model.

[0019] In the diagram, 1. Drying zone; 2. Calcination zone; 3. Cooling zone; 4. Catalyst unit; 5. Air duct; 6. Temperature regulating duct; 7. Fan 1; 8. Temperature regulating box; 9. Natural air duct; 10. Heating duct; 11. Fan 2; 12. Heating box; 13. Heater; 14. Exhaust gas emission duct; 15. Regulating valve; 16. Shell; 17. Insulation layer; 18. Conveyor belt. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model.

[0021] Example 1

[0022] like Figure 1 As shown, this embodiment provides a flat-plate SCR catalyst drying and calcination device, including a drying zone 1, a calcination zone 2 and a cooling zone 3. The drying zone 1, the calcination zone 2 and the cooling zone 3 are equipped with a conveying mechanism. The catalyst unit 4 is vertically placed on the conveying mechanism for conveying. In this embodiment, the conveying mechanism can be a conveyor belt 18.

[0023] like Figure 1 As shown, air ducts 5 are provided above and below the catalyst unit 4 in the drying zone 1, calcination zone 2, and cooling zone 3. Except for the inlet and outlet air ducts 5 of the drying zone 1, calcination zone 2, and cooling zone 3, the remaining air ducts 5 are arc-shaped. Since the catalyst unit 4 conveys air vertically, the multi-layer catalyst plates in the catalyst unit 4 form a vertical channel structure between the plates, thus forming an S-shaped channel with the air ducts 5 above them, allowing air to be conveyed within the S-shaped channel.

[0024] like Figure 1 As shown, the inlet air duct 5 of the drying zone 1 and the outlet air duct 5 of the cooling zone 3 are connected by a temperature regulating pipe 6. A fan 7 and a temperature regulating box 8 are installed on the temperature regulating pipe 6. The temperature regulating box 8 is equipped with a temperature sensor and connected to a natural air duct 9, which is equipped with a regulating valve 15. Natural air enters from the inlet air duct 5 of the cooling zone 3, exchanges heat with the catalyst unit 4 in the cooling zone 3 to form hot air. This hot air enters the temperature regulating pipe 6 through the outlet air duct 5, mixes and is temperature-regulated with the natural air entering the temperature regulating box 8, and then enters the drying zone 1 to dry the catalyst unit 4 in the drying zone 1. The temperature of the hot air entering the drying zone 1 can be controlled by adjusting the natural air flow rate into the temperature regulating box 8 using the regulating valve 15.

[0025] like Figure 1 As shown, the inlet air duct 5 and outlet air duct 5 of the calcination zone 2 are connected by a heating pipe 10. A second fan 11 and a heating chamber 12 are installed on the heating pipe 10. A heater 13 and a temperature sensor are installed inside the heating chamber 12. The catalyst unit 4, dried in the drying zone 1, is conveyed to the calcination zone 2. Air from the air duct 5 in the calcination zone 2, driven by the second fan 11, enters the heating chamber 12 in the heating pipe 10 through the outlet air duct 5. After being heated by the heater 13, the hot air enters the calcination zone 2 through the inlet air duct 5. The hot air flows through the S-shaped channel formed by the arc-shaped air duct 5 and the catalyst unit 4, calcining the catalyst unit 4 at high temperature. Finally, this portion of hot air re-enters the heating pipe 10 through the outlet air duct 5 for further heating, and the cycle repeats.

[0026] Working principle:

[0027] Based on the heat exchange principle, the structural characteristics and physical properties of the plate-type catalyst unit 4, this embodiment divides the plate-type SCR catalyst drying and calcination device into three functional areas: such as Figure 1 As shown, the device consists of a drying zone 1, a calcination zone 2, and a cooling zone 3 from left to right. The cooling zone 3 is connected to the drying zone 1 via a temperature regulating pipe 6. The high-temperature section and the low-temperature section of the calcination zone 2 are connected via a heating pipe 10, allowing hot air to circulate continuously between them. Natural air enters from the inlet air duct 5 on the right side of the cooling zone 3, passes through the outlet air duct 5 into the temperature regulating pipe 6, then enters the drying zone 1 through the inlet air duct 5, and finally exits through the outlet air duct 5.

[0028] The flat-plate SCR catalyst unit 4 is placed vertically on the conveyor belt 18 and passes through the drying zone 1, calcination zone 2, and cooling zone 3 in sequence. Each zone has air ducts 5 above and below the catalyst unit 4. The catalyst unit 4 passes through the middle of these air ducts 5, and the air can pass through in an S-shape between the air ducts 5 and the channels between the plates inside the catalyst unit 4.

[0029] After calcination in calcination zone 2, catalyst unit 4, carrying a large amount of heat, moves towards cooling zone 3. Natural air at the inlet of cooling zone 3 flows up and down through catalyst unit 4, exchanging heat with the catalyst unit 4, which carries a large amount of heat, causing its temperature to rise to approximately 400°C, while the temperature of catalyst unit 4 decreases. The hot air enters temperature control chamber 8, mixes with the natural air entering chamber 8, and forms 300°C hot air, which is then transported to drying zone 1 by fan 7. After entering drying zone 1, the hot air flows up and down through catalyst unit 4, exchanging heat with the cooler catalyst unit 4, gradually decreasing its temperature to approximately 50°C, while the temperature of catalyst unit 4 gradually increases to approximately 300°C. During the drying process, as the temperature rises, the moisture inside catalyst unit 4 evaporates rapidly and is carried by the hot air into the outlet air duct 5 for discharge.

[0030] After drying, the catalyst unit 4 enters the calcination zone 2. The flowing air generated by the blower 11 is heated to 550°C by the heating box 12. After entering the calcination zone 2 through the inlet air duct 5, it passes up and down through the catalyst unit 4 in the calcination zone 2, exchanging heat with the lower-temperature catalyst unit 4 in turn. The temperature of the hot air decreases to about 350°C, while the temperature of the catalyst unit 4 increases to about 550°C. The calcined catalyst unit 4 is then conveyed to the cooling zone 3, where it is cooled by natural airflow and then used as a product conveying device.

[0031] Example 2

[0032] Based on Example 1, such as Figure 1As shown, the heating pipe 10 is connected to the exhaust pipe 14, and regulating valves 15 are respectively installed on the heating pipe 10 and the exhaust pipe 14. In the calcination zone 2, the hot air that has been cooled to about 350°C after exchanging heat with the catalyst unit 4 at a lower temperature enters the heating pipe 10. Part of it is sent back to the heating box 12 by the second fan 11, and part of it is discharged through the exhaust pipe.

[0033] Example 3

[0034] Based on Example 1, such as Figure 1 As shown, the air duct 5 is covered by a shell 16, and an insulation layer 17 is provided between the shell 16 and the air duct 5. The shell 16 and the insulation layer 17 can insulate the air duct 5 in each zone, reduce the heat exchange between the air inside the air duct 5 and the external environment, and reduce heat loss.

Claims

1. A flat-plate SCR catalyst drying and calcination apparatus, characterized in that, The system includes a drying zone (1), a calcination zone (2), and a cooling zone (3). Each zone is equipped with a conveying mechanism. The catalyst unit (4) is vertically placed on the conveying mechanism for transport. Air ducts (5) are located above and below the catalyst unit (4) in the drying zone (1), calcination zone (2), and cooling zone (3). The air ducts (5) in the drying zone (1), calcination zone (2), and cooling zone (3) form an S-shaped channel with the vertically placed catalyst unit (4). (1) The inlet air duct (5) of the cooling zone (3) is connected to the outlet air duct (5) of the cooling zone (3) through the temperature regulating duct (6). The temperature regulating duct (6) is equipped with a fan (7) and a temperature regulating box (8). The temperature regulating box (8) is connected to a natural air duct (9). The inlet air duct (5) of the calcination zone (2) is connected to the outlet air duct (5) through the heating duct (10). The heating duct (10) is equipped with a fan (11) and a heating box (12). The heating box (12) is equipped with a heater (13).

2. The flat-plate SCR catalyst drying and calcining apparatus as described in claim 1, characterized in that, Except for the inlet air duct (5) and outlet air duct (5) of the drying zone (1), calcination zone (2) and cooling zone (3), the remaining air ducts (5) are arc-shaped ducts.

3. The flat-plate SCR catalyst drying and calcining apparatus as described in claim 1, characterized in that, The heating pipe (10) is connected to the exhaust pipe (14).

4. The flat-plate SCR catalyst drying and calcining apparatus as described in claim 3, characterized in that, The heating pipe (10) and the exhaust pipe (14) are respectively equipped with regulating valves (15).

5. The flat-plate SCR catalyst drying and calcining apparatus as described in claim 1, characterized in that, A regulating valve (15) is installed on the natural air duct (9).

6. The flat-plate SCR catalyst drying and calcining apparatus as described in claim 1, characterized in that, Temperature sensors are installed inside the temperature control box (8) and the heating box (12).

7. The flat-plate SCR catalyst drying and calcining apparatus as described in claim 1, characterized in that, The air transmission duct (5) is covered by a shell (16), and an insulation layer (17) is provided between the shell (16) and the air transmission duct (5).

8. The flat-plate SCR catalyst drying and calcining apparatus as described in claim 1, characterized in that, The conveying mechanism is a conveyor belt (18).

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