Microsilicon dust soot blowing device for silicon smelting flue gas denitrification

Abstract

The present application provides a micro-silicon dust sootblowing device for denitrification of silicon smelting flue gas, comprising: a compressed air heater, an automatic sootblowing actuator, a sootblowing device interface, a sootblowing support, a sootblower body, a branch pipe nozzle and a controller; one end of the compressed air heater is connected to a compressed air source, and the other end of the compressed air heater is connected to the sootblower body through the automatic sootblowing actuator and the sootblowing device interface, the sootblower body is arranged on the sootblowing support, a plurality of branch pipe nozzles are evenly arranged at the bottom of the sootblower body, and the branch pipe nozzle is located at the top of the catalyst; the controller is communicated with the compressed air heater, the automatic sootblowing actuator, the sootblower body and the branch pipe nozzle respectively to solve the problem of low denitrification efficiency of the sootblowing device.

Description

Technical Field

[0001] The present application relates to the technical field of air pollutant control, and in particular to a microsilicon dust soot blowing device for denitrification of silicon smelting flue gas. Background Art

[0002] Selective Catalytic Reduction (SCR) technology has been widely used in controlling silicon smelting flue gas. The periodicity and regularity of silicon smelting flue gas emissions are relatively strong, and the dust particle size is particularly fine when the smoke concentration is high. Gas-grade silicon dioxide is a nano-scale material with a huge specific surface area and is easy to absorb moisture and oil. The main component of dust in silicon smelting flue gas is microsilica powder. The significant characteristics of microsilica powder are small particle size, large specific surface area, strong adhesion, high thermal resistance and specific resistance. More than 90% of microsilica powder has a particle size of less than 1μm and a specific surface area of ​​25 to 30m 2 / g. Most of the dust has a diameter of 0.25um and is composed of spherical particles and pellets of these particles. Some dust in the airflow is less than 1um in size, with an average diameter of 0.4um-0.5um. Moreover, when its temperature is lower than 120℃, it is easy to secondary crystallize or harden on the pipes and fan blades, blocking the pipe network or causing the fan blades to lose dynamic balance, which is easy to cause catalyst blockage and reduce denitration efficiency. For this reason, SCR reactors are equipped with soot blowing devices.

[0003] In engineering practice, sonic sootblower devices and sootblower devices with steam or compressed air as the medium are often used. The sonic sootblower device cannot effectively remove the accumulated dust in the catalyst pores due to its low sootblowing intensity. The steam sootblower device has a high medium temperature (above 210°C), a high pressure (above 1.6MPa), and a high medium flow rate at the nozzle outlet, which has a good soot removal effect. However, if the hydrophobic effect is not good, the entrained moisture can easily combine with the dust in the flue gas and adhere to the surface of the catalyst, causing more serious blockage. Therefore, for occasions where steam sootblower is not suitable, only compressed air sootblower devices can be used. The compressed air sootblower is based on the high-pressure compressed air sprayed from the sootblowing component to the end face of the catalyst, thereby removing the dust on the top layer of the catalyst. However, since the temperature of the compressed air is room temperature, the maximum pressure can only reach 0.7Mpa, resulting in low denitration efficiency. Utility Model Content

[0004] The present application provides a micro-silicon dust soot blowing device for denitrification of silicon smelting flue gas, so as to solve the problem of low denitrification efficiency of the soot blowing device.

[0005] The present application provides a micro-silicon dust soot blowing device for silicon smelting flue gas denitrification, comprising: a compressed air heater, an automatic soot blowing actuator, a soot blowing device interface, a soot blowing support, a soot blower body, a branch pipe nozzle and a controller.

[0006] One end of the compressed air heater is connected to a compressed air source, and the other end of the compressed air heater is connected to the sootblower body through the automatic sootblowing actuator and the sootblowing device interface. The sootblower body is arranged on the sootblowing support, and a plurality of branch pipe nozzles are evenly arranged at the bottom of the sootblower body, and the branch pipe nozzles are located at the top of the catalyst; the controller is respectively communicated with the compressed air heater, the automatic sootblowing actuator, the sootblower body and the branch pipe nozzles.

[0007] After the compressed air is heated by the micro-silicon dust soot blowing device for silicon smelting flue gas denitrification, it enters the soot blower body through the soot blowing device interface, and then is distributed to the branch pipe nozzles in turn for high-speed spraying, thereby increasing the cleaning force and providing a certain guarantee for the activity and life of the denitrification catalyst. The automatic soot blowing execution module controls the movement of the soot blower body through the controller, so that the compressed air automatically blows and covers the entire catalyst surface, thereby solving the problem of low denitrification efficiency of the soot blowing device.

[0008] Optionally, the compressed air heater is a graphene heater, wherein a graphene film of the graphene heater is arranged on an inner side of the compressed air heater.

[0009] The graphene heater has a high electrical conversion rate, reduces energy consumption, is pollution-free during use, can heat up quickly, is not prone to malfunction, and can improve the efficiency of heating compressed air.

[0010] Optionally, a temperature sensor is provided on the compressed air heater, and the temperature sensor is communicatively connected to the controller.

[0011] The temperature information of the compressed air in the compressed air heater can be measured in real time by the temperature sensor and sent to the controller so that the compressed air can be controlled within a preset temperature threshold, thereby ensuring the dust cleaning capability and saving energy consumption.

[0012] Optionally, the automatic sootblowing actuator includes a pressure reducing station, a steam trap and a solenoid valve, and the pressure reducing station, the steam trap and the solenoid valve are all communicatively connected to the controller.

[0013] The decompression station is used to decompress the compressed air to the working pressure required by the sootblower body; the steam trap is used to remove condensed water to keep the compressed air dry; the solenoid valve is used to control the airflow direction to move the sootblower body to fully cover and purge the catalyst.

[0014] Optionally, the sootblowing device interface is arranged on the sootblowing support, and one end of the sootblowing device interface close to the sootblower body is movably connected to one end of the first flange, one end of the second flange is movably connected to one end of the sootblower body, and the other end of the first flange is connected to the other end of the second flange by screws.

[0015] The sootblower device interface and the sootblower body are combined with the flange, which not only improves the sealing performance of the connection but also facilitates installation and disassembly.

[0016] Optionally, the sootblowing support is located on the top of the catalyst, and the automatic sootblowing actuator, the sootblowing device interface and the sootblowing support are located on the same plane.

[0017] The automatic sootblowing actuator, the sootblowing device interface and the sootblowing support arranged on the same plane facilitate movement of the sootblower body and reduce the situation of compressed air blockage.

[0018] Optionally, the sootblower body includes a sootblowing main pipe and a sootblowing branch pipe, the sootblowing main pipe and the sootblowing branch pipe are perpendicular to each other, one end of the sootblowing branch pipe is connected to the bottom of the sootblowing main pipe, and the other end of the sootblowing branch pipe is connected to the branch pipe nozzle.

[0019] The sootblowing main pipe can provide a stable gas supply, and the sootblowing branch pipe is responsible for reasonably distributing the supply to each of the branch pipe nozzles to ensure that each of the sootblowing branch pipes can obtain appropriate pressure.

[0020] Optionally, the distance from the branch nozzle to the top of the catalyst is 50-200 mm, the blowing port of the branch nozzle faces the catalyst, the branch nozzle is a flat figure eight structure, and both sides of the branch nozzle are respectively located on the same straight line as both sides of the top of the catalyst.

[0021] The branch pipe nozzle 6 is a flat figure eight structure with a small injection angle and reasonable arrangement, which optimizes and reduces the soot blowing dead angle and further enhances the catalyst soot accumulation treatment effect.

[0022] Optionally, the controller is a controller based on an LSTM neural network.

[0023] Through the controller based on the LSTM neural network, the soot blowing frequency can be automatically adjusted after being linked with the catalyst pressure difference to achieve intelligent soot blowing.

[0024] It can be seen from the above technical scheme that the present application provides a micro-silicon dust sootblowing device for denitrification of silicon smelting flue gas, including: a compressed air heater, an automatic sootblowing actuator, a sootblowing device interface, a sootblowing support, a sootblower body, a branch nozzle and a controller; one end of the compressed air heater is connected to a compressed air source, and the other end of the compressed air heater is connected to the sootblower body through the automatic sootblowing actuator and the sootblowing device interface, the sootblower body is arranged on the sootblowing support, and a plurality of branch nozzles are evenly arranged at the bottom of the sootblower body, and the branch nozzle is located at the top of the catalyst; the controller is respectively communicated with the compressed air heater, the automatic sootblowing actuator, the sootblower body and the branch nozzle to solve the problem of low denitrification efficiency of the sootblowing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the embodiments are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0026] Figure 1 A schematic diagram of the structure of a micro-silicon dust soot blowing device for denitrification of silicon smelting flue gas provided in an embodiment of the present application.

[0027] Illustration Description:

[0028] Among them, 1-compressed air heater; 2-automatic sootblowing actuator; 3-sootblowing device interface; 4-sootblowing support; 5-sootblower body; 6-branch nozzle; 7-controller. DETAILED DESCRIPTION

[0029] The following embodiments are described in detail, and examples thereof are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following embodiments do not represent all implementations consistent with the present application. They are only examples of systems and methods consistent with some aspects of the present application as detailed in the claims.

[0030] Selective Catalytic Reduction (SCR) technology has been widely used in controlling silicon smelting flue gas. The periodicity and regularity of silicon smelting flue gas emissions are relatively strong, and the dust particle size is particularly fine when the smoke concentration is high. Gas-grade silicon dioxide is a nano-scale material with a huge specific surface area and is easy to absorb moisture and oil. The main component of dust in silicon smelting flue gas is microsilica powder. The significant characteristics of microsilica powder are small particle size, large specific surface area, strong adhesion, high thermal resistance and specific resistance. More than 90% of microsilica powder has a particle size of less than 1μm and a specific surface area of ​​25 to 30m2 / g. Most of the dust has a diameter of 0.25um and is composed of spherical particles and pellets of these particles. Some dust in the airflow is less than 1um in size, with an average diameter of 0.4um-0.5um. Moreover, when its temperature is lower than 120℃, it is easy to secondary crystallize or harden on the pipes and fan blades, blocking the pipe network or causing the fan blades to lose dynamic balance, which is easy to cause catalyst blockage and reduce denitration efficiency. For this reason, SCR reactors are equipped with soot blowing devices.

[0031] In the relevant embodiment, the compressed air soot blowing device is based on the high-pressure compressed air sprayed by the soot blowing assembly to the top surface of the catalyst, thereby removing the dust on the catalyst layer. However, since the temperature of the compressed air is room temperature, the maximum pressure can only reach 0.7Mpa, resulting in low denitration efficiency.

[0032] To solve the problem of low denitrification efficiency of sootblower, see Figure 1 , Figure 1 The present invention is a schematic diagram of the structure of a micro-silicon dust soot blowing device for silicon smelting flue gas denitration. The present application embodiment provides a micro-silicon dust soot blowing device for silicon smelting flue gas denitration, comprising: a compressed air heater 1, an automatic soot blowing actuator 2, a soot blowing device interface 3, a soot blowing support 4, a soot blower body 5, a branch pipe nozzle 6 and a controller 7.

[0033] One end of the compressed air heater 1 is connected to a compressed air source, and the other end of the compressed air heater 1 is connected to the sootblower body 5 through the automatic sootblowing actuator 2 and the sootblowing device interface 3. The sootblower body 5 is arranged on the sootblowing support 4, and a plurality of branch pipe nozzles 6 are evenly arranged at the bottom of the sootblower body 5, and the branch pipe nozzles 6 are located at the top of the catalyst; the controller 7 is respectively communicated with the compressed air heater 1, the automatic sootblowing actuator 2, the sootblower body 5 and the branch pipe nozzles 6.

[0034] It should be understood that the pressure of compressed air can be selected as 0.4-0.6Mpa, and the temperature of the compressed air after passing through the compressed air heater 1 is not less than the flue gas temperature (160-200 degrees Celsius). The compressed air heating module 1 is used to provide heating and temperature rise of compressed air to ensure that the soot blowing temperature is not lower than the flue gas temperature; the automatic soot blowing execution module 2 is used to provide mechanical control such as power and stroke of the soot blower body 5; the soot blowing device interface 3 is used to provide necessary flange interface and load support; the soot blowing support 4 is used for load bearing, deformation coordination and stroke guidance of the soot blower body 5; the soot blower body 5 is used to provide uniform distribution and load bearing of compressed air; the high-pressure jet formed by the branch nozzle 6 generates a large impact force to sweep along the direction of flue gas flow, directly blowing to the catalyst surface and microporous microsilicon dust with the flue gas; the control module 7 is used to interlock with the denitrification catalyst pressure difference, set the corresponding soot blowing frequency and control program, and complete automatic control of soot blowing.

[0035] After the compressed air is heated by the micro-silicon dust soot blowing device for silicon smelting flue gas denitrification, it enters the soot blower body 5 through the soot blowing device interface 3, and then is distributed to the branch pipe nozzles 6 in turn for high-speed spraying, thereby increasing the soot cleaning force and providing a certain guarantee for the activity and life of the denitrification catalyst. The automatic soot blowing execution module controls the movement of the soot blower body 5 through the controller 7, so that the compressed air automatically blows and covers the entire catalyst surface, thereby solving the problem of low denitrification efficiency of the soot blowing device.

[0036] In some other embodiments, the number of the branch nozzles 6 is set according to the length of the top surface of the catalyst and the length of the sootblower body 5, and the distance between two adjacent branch nozzles 6 is equal to the distance between two adjacent catalysts, so that the automatic sootblowing actuator 2 can blow the entire top surface of the catalyst by moving one stroke.

[0037] In some embodiments, the compressed air heater 1 is a graphene heater, wherein a graphene film of the graphene heater is arranged on the inner side of the compressed air heater 1 .

[0038] It should be understood that the graphene film is close to the compressed air, so that the graphene heater has a high electrical conversion rate, reduces energy consumption, is pollution-free during use, can heat up quickly, is not prone to malfunction, and can improve the efficiency of heating compressed air.

[0039] In some embodiments, a temperature sensor is provided on the compressed air heater 1 , and the temperature sensor is communicatively connected with the controller 7 .

[0040] The temperature information of the compressed air in the compressed air heater 1 can be measured in real time by the temperature sensor and sent to the controller 7 so that the compressed air can be controlled within a preset temperature threshold, thereby ensuring the dust cleaning capability and saving energy consumption.

[0041] In some embodiments, the automatic sootblowing actuator 2 includes a pressure reducing station, a steam trap and a solenoid valve, and the pressure reducing station, the steam trap and the solenoid valve are all in communication connection with the controller 7 .

[0042] The decompression station is used to decompress the compressed air to the working pressure required by the sootblower body 5; the steam trap is used to remove condensed water to keep the compressed air dry; the solenoid valve is used to control the airflow direction to move the sootblower body 5 to fully cover and purge the catalyst.

[0043] In some embodiments, the sootblowing device interface 3 is arranged on the sootblowing support 4, and one end of the sootblowing device interface 3 close to the sootblower body 5 is movably connected to one end of the first flange, one end of the second flange is movably connected to one end of the sootblower body 5, and the other end of the first flange is connected to the other end of the second flange by screws.

[0044] The compressed air enters the sootblower body 5 through the sootblower interface 3, which plays a buffering role; the sootblower interface 3, the sootblower body 5 and the flange are combined, which not only improves the sealing of the connection, but also facilitates installation and disassembly.

[0045] In some embodiments, the sootblowing support 4 is located on the top of the catalyst, and the automatic sootblowing actuator 2 , the sootblowing device interface 3 and the sootblowing support 4 are located on the same plane.

[0046] The automatic sootblowing actuator 2, the sootblowing device interface 3 and the sootblowing support 4 arranged on the same plane facilitate the movement of the sootblower body 5 and reduce the blockage of compressed air.

[0047] In some embodiments, the sootblower body 5 includes a sootblowing main pipe and a sootblowing branch pipe, the sootblowing main pipe and the sootblowing branch pipe are perpendicular to each other, one end of the sootblowing branch pipe is connected to the bottom of the sootblowing main pipe, and the other end of the sootblowing branch pipe is connected to the branch pipe nozzle 6.

[0048] The sootblowing main pipe can provide a stable gas supply, and the sootblowing branch pipe is responsible for reasonably distributing the supply to each of the branch pipe nozzles 6 to ensure that each of the sootblowing branch pipes can obtain an appropriate pressure.

[0049] In some embodiments, the distance from the branch nozzle 6 to the top of the catalyst is 50-200 mm, the blowing port of the branch nozzle 6 faces the catalyst, the branch nozzle 6 is a flat figure eight structure, and both sides of the branch nozzle 6 are respectively located on the same straight line as both sides of the top of the catalyst.

[0050] It should be understood that the branch nozzle 6 has a certain height from the top surface of the catalyst, and the high-pressure jet formed can generate a large impact force, sweeping from the nozzle along the direction of the flue gas flow, blowing directly to the top surface and micropores of the catalyst, and taking away the secondary dust of microsilicon dust with the flue gas. The height of the branch nozzle 6 from the top surface of the catalyst is preferably 100mm. The branch nozzle 6 is a flat eight-shaped structure, with a small injection angle and reasonable layout, which optimizes and reduces the dead angle of soot blowing, and further enhances the treatment effect of catalyst soot accumulation.

[0051] In some embodiments, the controller 7 is a controller based on an LSTM neural network.

[0052] Through the controller based on the LSTM neural network, the soot blowing frequency can be automatically adjusted after being linked with the catalyst pressure difference to achieve intelligent soot blowing.

[0053] It should be understood that a pressure sensor is also included, which is communicated with the controller 7. The pressure sensor is used to measure the pressure at the branch nozzle 6 and the pressure on the catalyst surface, and then calculate the pressure difference with the catalyst. Since the pressure difference with the catalyst is interlocked with the control, the total gas consumption required for cleaning is reduced overall, and the operating cost can be reduced accordingly.

[0054] It can be seen from the above technical scheme that the embodiment of the present application provides a micro-silicon dust sootblowing device for denitrification of silicon smelting flue gas, including: a compressed air heater 1, an automatic sootblowing actuator 2, a sootblowing device interface 3, a sootblowing support 4, a sootblower body 5, a branch nozzle 6 and a controller 7; one end of the compressed air heater 1 is connected to a compressed air source, and the other end of the compressed air heater 1 is connected to the sootblower body 5 through the automatic sootblowing actuator 2 and the sootblowing device interface 3, the sootblower body 5 is arranged on the sootblowing support 4, and a plurality of the branch nozzles 6 are evenly arranged at the bottom of the sootblower body 5, and the branch nozzle 6 is located at the top of the catalyst; the controller 7 is respectively communicated with the compressed air heater 1, the automatic sootblowing actuator 2, the sootblower body 5 and the branch nozzle 6 to solve the problem of low denitrification efficiency of the sootblowing device.

[0055] Similar parts between the embodiments provided in this application can be referenced to each other. The specific implementation methods provided above are only a few examples under the general concept of this application and do not constitute a limitation on the protection scope of this application. For those skilled in the art, any other implementation methods expanded based on the scheme of this application without creative work belong to the protection scope of this application.

Claims

1. A micro-silicon dust soot blowing device for silicon smelting flue gas denitrification, characterized in that: include: A compressed air heater (1), an automatic sootblowing actuator (2), a sootblowing device interface (3), a sootblowing support (4), a sootblower body (5), a branch pipe nozzle (6) and a controller (7); One end of the compressed air heater (1) is connected to a compressed air source, and the other end of the compressed air heater (1) is connected to the sootblower body (5) through the automatic sootblowing actuator (2) and the sootblowing device interface (3); the sootblower body (5) is arranged on the sootblowing support (4); a plurality of branch pipe nozzles (6) are evenly arranged at the bottom of the sootblower body (5); and the branch pipe nozzles (6) are located at the top of the catalyst; the controller (7) is respectively connected to the compressed air heater (1), the automatic sootblowing actuator (2), the sootblower body (5) and the branch pipe nozzles (6) in communication.

2. The micro-silicon dust soot blowing device for silicon smelting flue gas denitrification according to claim 1 is characterized in that: The compressed air heater (1) is a graphene heater, wherein a graphene film of the graphene heater is arranged on the inner side of the compressed air heater (1).

3. The micro-silicon dust soot blowing device for silicon smelting flue gas denitrification according to claim 1 is characterized in that: The compressed air heater (1) is provided with a temperature sensor, and the temperature sensor is communicatively connected with the controller (7).

4. The micro-silicon dust soot blowing device for silicon smelting flue gas denitrification according to claim 1 is characterized in that: The automatic sootblowing actuator (2) comprises a pressure reducing station, a drain valve and a solenoid valve, and the pressure reducing station, the drain valve and the solenoid valve are all in communication connection with the controller (7).

5. The micro-silicon dust soot blowing device for silicon smelting flue gas denitrification according to claim 1 is characterized in that: The sootblowing device interface (3) is arranged on the sootblowing support (4), and one end of the sootblowing device interface (3) close to the sootblower body (5) is movably connected to one end of the first flange, one end of the second flange is movably connected to one end of the sootblower body (5), and the other end of the first flange is connected to the other end of the second flange by screws.

6. The micro-silicon dust soot blowing device for silicon smelting flue gas denitrification according to claim 1 is characterized in that: The soot blowing support (4) is located on the top of the catalyst, and the automatic soot blowing actuator (2), the soot blowing device interface (3) and the soot blowing support (4) are located on the same plane.

7. The micro-silicon dust soot blowing device for silicon smelting flue gas denitrification according to claim 1 is characterized in that: The sootblower body (5) comprises a sootblowing main pipe and a sootblowing branch pipe, wherein the sootblowing main pipe and the sootblowing branch pipe are perpendicular to each other, one end of the sootblowing branch pipe is connected to the bottom of the sootblowing main pipe, and the other end of the sootblowing branch pipe is connected to the branch pipe nozzle (6).

8. The micro-silicon dust soot blowing device for silicon smelting flue gas denitrification according to claim 1 is characterized in that: The distance between the branch pipe nozzle (6) and the top of the catalyst is 50-200 mm, the blowing port of the branch pipe nozzle (6) faces the catalyst, the branch pipe nozzle (6) is a flat figure eight structure, and the two sides of the branch pipe nozzle (6) are respectively located on the same straight line as the two sides of the top of the catalyst.

9. The micro-silicon dust soot blowing device for silicon smelting flue gas denitrification according to claim 1 is characterized in that: The controller (7) is a controller based on an LSTM neural network.

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