A test device and use method for evaluating the SO3 removal effect of a multi-physical-form adsorbent

Abstract

This invention discloses an experimental apparatus and method for evaluating the SO3 removal effect of adsorbents in multiple physical forms. The apparatus includes: a flue gas simulation device for providing flue gas at a set temperature; an SO3 generation device for providing SO3; and an SO3 adsorbent supply device for providing SO3 adsorbent solution or slurry, connected to the flue gas simulation device. Different ports of the SO3 generation device and the flue gas simulation device are connected to measure the SO3 removal rate of the liquid / slurry SO3 adsorbent or the SO3 removal rate of the dry powder SO3 adsorbent. The experimental apparatus and method provided by this invention for evaluating the SO3 removal effect of adsorbents in multiple physical forms can measure the actual SO3 removal effect of adsorbents in multiple physical forms simply by changing the location of SO3 addition. It is highly versatile and easy to operate.

Description

Technical Field

[0001] This invention belongs to the field of SO3 removal technology, specifically relating to a test device and method for evaluating the SO3 removal effect of adsorbents in multiple physical forms. Background Technology

[0002] To achieve ultra-low NOx emissions, coal-fired power plants commonly install SCR (Selective Catalytic Reduction) flue gas denitrification devices. Under the action of a catalyst, some SO2 is oxidized to SO3. When the SO3 concentration exceeds 2-3 ppm and ammonia slip exceeds 2 ppm, ammonium bisulfate deposition occurs in downstream equipment such as air preheaters, affecting the safe and economical operation of the equipment. When the SO3 concentration at the chimney outlet exceeds 10-20 ppm, a blue plume forms. SO3 removal is of great significance for the safe, economical, and environmentally friendly operation of coal-fired power plants.

[0003] Common methods for SO3 removal include in-furnace calcium injection and flue gas injection of alkaline dry powder, solution, and slurry adsorbents. However, there is still a lack of research on how to completely simulate the atomization, diffusion, drying, and SO3 adsorption processes of alkaline dry powder / solution / slurry adsorbents in high-temperature flue gas and obtain the actual SO3 removal effect of the adsorbents. Summary of the Invention

[0004] To address the technical problems existing in the prior art, the purpose of this invention is to provide a test device and method for evaluating the SO3 removal effect of adsorbents with multiple physical forms.

[0005] To achieve the above objectives and technical effects, the technical solution adopted by this invention is as follows:

[0006] An experimental apparatus for evaluating the SO3 removal efficiency of adsorbents in multiple physical forms includes:

[0007] A flue gas simulation device is used to provide flue gas at a set temperature;

[0008] SO3 generating apparatus, used to provide SO3;

[0009] An SO3 adsorbent supply device is used to provide SO3 adsorbent solution or slurry, and the SO3 adsorption device is connected to a flue gas simulation device.

[0010] The SO3 generation device is connected to different ports of the flue gas simulation device to measure the SO3 removal rate of the soluble / slurry-state SO3 adsorbent or the SO3 removal rate of the dry powder SO3 adsorbent.

[0011] Furthermore, the flue gas simulation device includes a blower, a silencer, a gas-to-gas heat exchanger, an electric heater, a rotary spray drying tower, a cyclone dust collector, an induced draft fan, and a water film dust collector. The blower, silencer, and gas-to-gas heat exchanger are arranged sequentially along the gas inflow direction. The outlet of the gas-to-gas heat exchanger is connected to the inlet of the electric heater and the cyclone dust collector. The outlet of the rotary spray drying tower is connected to the inlet of the gas-to-gas heat exchanger. The inlet of the rotary spray drying tower is connected to the outlet of the electric heater. The gas-to-gas heat exchanger is connected to the cyclone dust collector. The cyclone dust collector, induced draft fan, and water film dust collector are arranged sequentially along the gas inflow direction.

[0012] Furthermore, a flow meter is installed at the outlet of the silencer, a temperature meter and a pressure meter are installed at the outlet of the electric heater, and a pressure meter is installed on the rotary spray drying tower.

[0013] Furthermore, the SO3 generating device includes an SO2 standard gas cylinder, a pressure reducing valve, an SO3 generator, a second ball valve, and a third ball valve. The SO2 standard gas cylinder, the pressure reducing valve, and the SO3 generator are sequentially connected. The SO3 generator is connected to the inlet of the rotary spray drying tower of the flue gas simulation device through the second ball valve, and the SO3 generator is connected to the outlet of the rotary spray drying tower through the third ball valve. When measuring the SO3 removal rate of the soluble / slurry-state SO3 adsorbent, the second ball valve is open and the third ball valve is closed. When measuring the SO3 removal rate of the dry powder-state SO3 adsorbent, the second ball valve is closed and the third ball valve is open.

[0014] Furthermore, a flow meter is installed at the outlet of the pressure reducing valve, and a temperature meter is installed at the outlet of the SO3 generator.

[0015] Furthermore, the SO3 adsorbent supply device includes a solution / slurry tank, a slurry pump, and a first ball valve. The solution / slurry tank is connected to the rotary spray drying tower of the flue gas simulation device through the slurry pump and the first ball valve.

[0016] This invention also discloses a method for using a test device applicable to evaluating the SO3 removal effect of adsorbents in multiple physical forms. When measuring the SO3 removal rate of a soluble / slurry-like SO3 adsorbent, the method includes the following steps:

[0017] 1) Prepare the SO3 adsorbent solution / slurry required for the experiment, store it in the solution / slurry tank, and start the agitator in the solution / slurry tank to prevent the adsorbent from precipitating or settling, and keep the first ball valve closed;

[0018] 2) Prepare standard SO2 gas, keep the pressure reducing valve, the second ball valve, and the third ball valve closed, and start the SO3 generator to preheat;

[0019] 3) Start the frequency converter, adjust the speed of the blower and the induced draft fan to make the air flow reach the set value, and maintain a slight negative pressure of about -200Pa inside the rotary spray drying tower;

[0020] 4) Start the electric heater to bring the hot air temperature to the set value;

[0021] 5) After the SO3 generator has preheated, start the water film dust collector, open the pressure reducing valve, and adjust the pressure to about 0.2 MPa;

[0022] 6) Based on the SO3 concentration in the hot air, the SO2 concentration in the standard gas, and the SO2 / SO3 conversion rate of the SO3 generator, calculate the required standard gas flow rate and adjust the opening of the second ball valve to make the standard gas flow rate reach the required value.

[0023] 7) Sampling SO3 was performed at the second, third, and fourth sampling ports respectively. When the deviation of the measured SO3 concentration at the second, third, and fourth sampling ports was less than 5%, the rotary atomizer at the top of the rotary spray drying tower was started to begin the test.

[0024] 8) Calculate the flow rate of the adsorbent solution / slurry according to the adsorbent / SO3 equivalent ratio set in the experiment, start the slurry pump, adjust the opening of the first ball valve to make the flow rate of the adsorbent solution / slurry reach the set value, and after stabilizing for a period of time, take SO3 samples at the second sampling port, the third sampling port and the fourth sampling port respectively, measure the SO3 concentration, and turn off the slurry pump after the sampling is completed.

[0025] 9) Based on the SO3 concentrations measured in steps 7) and 8), calculate the SO3 removal rate at different locations along the process.

[0026] 10) Adjust the hot air temperature setting value, repeat steps 7) to 9), and measure the SO3 removal rate at different temperatures and different adsorbent / SO3 equivalent ratios;

[0027] 11) At the end of the test, close the pressure reducing valve, SO3 generator, second ball valve and third ball valve in sequence. Rinse the SO3 adsorbent solution / slurry pipeline with clean water to remove any residue. Then turn off the electric heater and the rotary atomizer at the top of the rotary spray drying tower. After the hot air temperature drops below 50°C, turn off the water film dust collector, blower and induced draft fan.

[0028] This invention also discloses a method for using a test device applicable to evaluating the SO3 removal effect of adsorbents in multiple physical forms. When testing the SO3 removal rate of dry powder SO3 adsorbents, the method includes the following steps:

[0029] 1) Store the SO3 adsorbent solution / slurry required for the test in the solution / slurry tank, and start the agitator in the solution / slurry tank to prevent the adsorbent from precipitating or settling, and keep the first ball valve closed;

[0030] 2) Prepare standard SO2 gas, keep the pressure reducing valve, the second ball valve, and the third ball valve closed, and start the SO3 generator to preheat;

[0031] 3) Start the frequency converter, adjust the speed of the blower and the induced draft fan to make the air flow reach the set value, and maintain a slight negative pressure of about -200Pa inside the rotary spray drying tower;

[0032] 4) Start the electric heater to bring the hot air temperature to the set value;

[0033] 5) After the SO3 generator has preheated, start the water film dust collector, open the pressure reducing valve, and adjust the pressure to about 0.2 MPa;

[0034] 6) Based on the SO3 concentration in the hot air, the SO2 concentration in the standard gas, and the SO2 / SO3 conversion rate of the SO3 generator, calculate the required standard gas flow rate and adjust the opening of the third ball valve to make the standard gas flow rate reach the required value.

[0035] 7) Sampling SO3 was performed at the third and fourth sampling ports respectively. When the deviation of the measured SO3 concentration at the third and fourth sampling ports was less than 5%, the rotary atomizer at the top of the rotary spray drying tower was started to begin the test.

[0036] 8) Calculate the flow rate of the adsorbent solution / slurry according to the adsorbent / SO3 equivalent ratio set in the experiment, start the slurry pump, adjust the opening of the first ball valve to make the flow rate of the adsorbent solution / slurry reach the set value, and after stabilizing for a period of time, take SO3 samples at the third and fourth sampling ports respectively, measure the SO3 concentration, and turn off the slurry pump after sampling is completed.

[0037] 9) Based on the SO3 concentrations measured in steps 7) and 8), calculate the SO3 removal rate at different locations along the process.

[0038] 10) Adjust the hot air temperature setting value, repeat steps 7) to 9), and measure the SO3 removal rate at different temperatures and different adsorbent / SO3 equivalent ratios;

[0039] 11) At the end of the test, close the pressure reducing valve, SO3 generator, second ball valve and third ball valve in sequence. Rinse the SO3 adsorbent solution / slurry pipeline with clean water to remove any residue. Then turn off the electric heater and the rotary atomizer at the top of the rotary spray drying tower. After the hot air temperature drops below 50°C, turn off the water film dust collector, blower and induced draft fan.

[0040] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0041] This invention discloses an experimental apparatus and method for evaluating the SO3 removal effect of adsorbents in multiple physical forms. The apparatus includes: a flue gas simulation device for providing flue gas at a set temperature; an SO3 generation device for providing SO3; and an SO3 adsorbent supply device for providing SO3 adsorbent solution or slurry, connected to the flue gas simulation device. Different ports of the SO3 generation device are connected to the flue gas simulation device to measure the SO3 removal rate of the soluble / slurry-state SO3 adsorbent or the SO3 removal rate of the dry powder-state SO3 adsorbent. The experimental apparatus and method provided by this invention for evaluating the SO3 removal effect of adsorbents in multiple physical forms can measure the actual SO3 removal effect of adsorbents in multiple physical forms (soluble / slurry-state or dry powder-state) simply by changing the SO3 addition location. It is highly versatile and easy to operate. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the structure of the present invention;

[0043] The components include: 1. Blower; 2. Silencer; 3. Gas-to-gas heat exchanger; 4. Electric heater; 5. Rotary spray drying tower; 6. Cyclone dust collector; 7. Exhaust fan; 8. Water film dust collector; 9. Solvent / slurry tank; 10. Slurry pump; 11. First ball valve; 12. SO2 standard gas cylinder; 13. Pressure reducing valve; 14. SO3 generator; 15. Second ball valve; 16. Third ball valve; 17. First sampling port; 18. Second sampling port; 19. Third sampling port; 20. Fourth sampling port; 21. Temperature instrument; 22. Pressure instrument; 23. Flow meter. Detailed Implementation

[0044] The present invention will now be described in detail so that its advantages and features can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0045] The following provides a brief overview of one or more aspects to offer a basic understanding of them. This overview is not an exhaustive summary of all conceived aspects, nor is it intended to identify key or decisive elements of all aspects, nor to define the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form to prepare for the more detailed descriptions that follow.

[0046] like Figure 1As shown, a test apparatus for evaluating SO3 removal efficiency includes a blower 1, a silencer 2, a gas-to-gas heat exchanger 3, an electric heater 4, a rotary spray drying tower 5, a cyclone dust collector 6, an induced draft fan 7, a water film dust collector 8, a solvent / slurry tank 9, a slurry pump 10, a first ball valve 11, an SO2 standard gas cylinder 12, a pressure reducing valve 13, an SO3 generator 14, a second ball valve 15, a third ball valve 16, a first sampling port 17, a second sampling port 18, a third sampling port 19, a fourth sampling port 20, a temperature instrument 21, a pressure instrument 22, and a flow meter 23. The blower 1, silencer 2, and gas-to-gas heat exchanger 3... The electric heater 4, rotary spray drying tower 5, cyclone dust collector 6, induced draft fan 7, and water film dust collector 8 constitute a flue gas simulation device used to provide flue gas at a set temperature. The blower 1, silencer 2, and gas-to-gas heat exchanger 3 are arranged sequentially along the gas inflow direction. The outlet of the gas-to-gas heat exchanger 3 is connected to the inlet of the electric heater 4 and cyclone dust collector 6. The outlet of the rotary spray drying tower 5 is connected to the inlet of the gas-to-gas heat exchanger 3. The inlet of the rotary spray drying tower 5 is connected to the outlet of the electric heater 4. The gas-to-gas heat exchanger 3 is connected to the cyclone dust collector 6. The cyclone dust collector 6, induced draft fan 7, and water film dust collector 8 are arranged sequentially along the gas inflow direction. The SO3 adsorbent supply device consists of a solution / slurry tank 9, a slurry pump 10, and a first ball valve 11, used to provide SO3 adsorbent solution or slurry. The solution / slurry tank 9 is connected to the rotary spray drying tower 5 via the slurry pump 10 and the first ball valve 11. The SO2 standard gas cylinder 12, the pressure reducing valve 13, the SO3 generator 14, the second ball valve 15, and the third ball valve 16 constitute an SO3 generating device, used to provide SO3. The SO2 standard gas cylinder 12, the pressure reducing valve 13, and the SO3 generator 14 are connected sequentially. The SO3 generator 14 is connected to the inlet of the rotary spray drying tower 5 via the second ball valve 15. The generator 14 is connected to the outlet of the rotary spray drying tower 5 via the third ball valve. A flow meter 23 is installed at the outlet of the silencer 2. A temperature meter 21 and a pressure meter 22 are installed at the outlet of the electric heater 4. A pressure meter 22 is also installed on the rotary spray drying tower 5. A flow meter 23 is installed at the outlet of the pressure reducing valve 13. A temperature meter 21 is installed at the outlet of the SO3 generator 14. When measuring the SO3 removal rate of the soluble / slurry-state SO3 adsorbent, the second ball valve 15 is opened and the third ball valve 16 is closed. When measuring the SO3 removal rate of the dry powder-state SO3 adsorbent, the second ball valve 15 is closed and the third ball valve 16 is opened.

[0047] In this invention, the flow process of flue gas or ambient air is as follows: after being pressurized by blower 1, flue gas or ambient air flows through silencer 2 and then enters gas-to-gas heat exchanger 3, where it exchanges heat with the high-temperature gas discharged from rotary spray drying tower 5, recovers heat, and increases temperature. The air that has undergone the first temperature increase is reheated by electric heater 4 to reach the set temperature, and then enters rotary spray drying tower 5. The hot air coming out of rotary spray drying tower 5 is cooled by gas-to-gas heat exchanger 3 and then enters cyclone dust collector 6. The dust-removed air enters water film dust collector 8 through induced draft fan 7 for further purification before being discharged. The air flow rate is controlled by frequency converter to adjust the speed of blower 1 and induced draft fan 7 and maintain a slight negative pressure of about -200Pa inside rotary spray drying tower 5.

[0048] The SO3 generation process is as follows: SO2 enters the SO3 generator 14 from the SO2 standard gas cylinder 12 through the pressure reducing valve 13. Inside the SO3 generator 14, SO2 is catalytically oxidized to SO3 and then split into two streams. One stream passes through the second ball valve 15 and mixes with the high-temperature air at the inlet of the rotary spray dryer 5; the other stream passes through the third ball valve 16 and mixes with the high-temperature air at the outlet of the rotary spray dryer 5. When measuring the SO3 removal rate of the slurry / liquid SO3 adsorbent, the second ball valve 15 is open and the third ball valve 16 is closed; when measuring the SO3 removal rate of the dry powder SO3 adsorbent, the second ball valve 15 is closed and the third ball valve 16 is open. The SO2 standard gas flow rate is regulated by the second ball valve 15 and the third ball valve 16.

[0049] The prepared SO3 adsorbent solution or slurry is temporarily stored in the solution / slurry tank 9, and then pumped by the slurry pump 10 into the rotary atomizer 51 at the top of the rotary spray drying tower 5. The atomized droplets enter the rotary spray drying tower 5, where they diffuse, dry, and adsorb SO3 in the hot air. The dried SO3 adsorbent particles are carried away by the hot air through the outlet at the bottom of the rotary spray drying tower 5. A flow meter 23 is installed at the outlet of the slurry pump 10, and the flow rate is regulated by the first ball valve 11.

[0050] To measure the SO3 concentration in the airflow, a first sampling port 17, a second sampling port 18, a third sampling port 19, and a fourth sampling port 20 are respectively installed on the hot air pipeline at the outlet of SO3 generator 14, the inlet of rotary spray drying tower 5, the outlet of rotary spray drying tower 5, and the inlet of gas-to-gas heat exchanger 3.

[0051] SO3 sampling was conducted according to EPA Method 8. The sulfate ion concentration in the samples was then analyzed using chemical titration. Based on the measured gas flow rate, the SO3 concentration and SO3 removal rate at each sampling point were calculated using the following formula:

[0052]

[0053]

[0054] In the formula, C SO3,i C represents the SO3 concentration at the i-th sampling port, in μL / L. dy V represents the concentration of the titrant, in mol / L. dy V represents the volume of the titrant, in mL; ddyp V represents the volume of the titrated sample, in mL; yp V represents the volume of the sample, in mL. yq The standard volume of the sampled flue gas, in mL, η i,j The SO3 removal efficiency of the adsorbent in the flue section from the i-th sampling port to the j-th sampling port is given in units.

[0055] A method for using a test apparatus for evaluating SO3 removal efficiency, when testing the SO3 removal rate of a soluble / slurry-like SO3 adsorbent, includes the following steps:

[0056] 1) Prepare the SO3 adsorbent solution / slurry required for the experiment, store it in the solution / slurry tank 9, and start the agitator in the solution / slurry tank 9 to prevent the adsorbent from precipitating or settling, and keep the first ball valve 11 closed;

[0057] 2) Prepare standard SO2 gas, keep pressure reducing valve 13, second ball valve 15, and third ball valve 16 closed, and start SO3 generator 14 to preheat;

[0058] 3) Start the frequency converter, adjust the speed of blower 1 and induced draft fan 7 to make the air flow reach the set value, and maintain a slight negative pressure of about -200Pa inside the rotary spray drying tower 5.

[0059] 4) Start the electric heater 4 to bring the hot air temperature to the set value;

[0060] 5) After the SO3 generator 14 has finished preheating, start the water film dust collector 8, open the pressure reducing valve 13, and adjust the pressure to about 0.2MPa;

[0061] 6) Based on the SO3 concentration in the hot air, the SO2 concentration in the standard gas, and the SO2 / SO3 conversion rate of the SO3 generator 14, calculate the required standard gas flow rate and adjust the opening of the second ball valve 15 to make the standard gas flow rate reach the required value.

[0062] 7) SO3 samples were taken at the second sampling port 18, the third sampling port 19, and the fourth sampling port 20 respectively. When the deviation of the measured SO3 concentration at the second sampling port 18, the third sampling port 19, and the fourth sampling port 20 was less than 5%, the rotary atomizer at the top of the rotary spray drying tower 5 was started to begin the test.

[0063] 8) Based on the adsorbent / SO3 equivalent ratio set in the experiment, calculate the flow rate of the adsorbent solution / slurry. Start the slurry pump 10, adjust the opening of the first ball valve 11 to make the flow rate of the adsorbent solution / slurry reach the set value, and after stabilizing for 5 minutes, take SO3 samples at the second sampling port 18, the third sampling port 19, and the fourth sampling port 20 respectively, and measure the SO3 concentration. After sampling is completed, turn off the slurry pump 10.

[0064] 9) Based on the SO3 concentrations measured in steps 7) and 8), calculate the SO3 removal rate at different locations (dwell time) along the process.

[0065] 10) Adjust the hot air temperature setting value, repeat steps 7) to 9), and measure the SO3 removal rate at different temperatures and different adsorbent / SO3 equivalent ratios;

[0066] 11) At the end of the test, close the pressure reducing valve 13, SO3 generator 14, second ball valve 15, and third ball valve 16 in sequence. Rinse the SO3 adsorbent solution / slurry pipeline with clean water to remove any residue. Then, turn off the electric heater 4 and the rotary atomizer at the top of the rotary spray drying tower 5. After the hot air temperature drops below 50°C, turn off the water film dust collector 8, blower 1, and induced draft fan 7.

[0067] A method for using a test apparatus for evaluating SO3 removal efficiency, when testing the SO3 removal rate of a dry powder SO3 adsorbent, includes the following steps:

[0068] 1) The SO3 adsorbent solution / slurry required for the test is stored in the solution / slurry tank 9, and the agitator in the solution / slurry tank 9 is started to prevent the adsorbent from precipitating or settling, and the first ball valve 11 is kept closed;

[0069] 2) Prepare standard SO2 gas, keep pressure reducing valve 13, second ball valve 15, and third ball valve 16 closed, and start SO3 generator 14 to preheat;

[0070] 3) Start the frequency converter, adjust the speed of blower 1 and induced draft fan 7 to make the air flow reach the set value, and maintain a slight negative pressure of about -200Pa inside the rotary spray drying tower 5.

[0071] 4) Start the electric heater 4 to bring the hot air temperature to the set value;

[0072] 5) After the SO3 generator 14 has finished preheating, start the water film dust collector 8, open the pressure reducing valve 13, and adjust the pressure to about 0.2MPa;

[0073] 6) Based on the SO3 concentration in the hot air, the SO2 concentration in the standard gas, and the SO2 / SO3 conversion rate of the SO3 generator 14, calculate the required standard gas flow rate and adjust the opening of the third ball valve 16 to make the standard gas flow rate reach the required value.

[0074] 7) SO3 samples were taken at the third sampling port 19 and the fourth sampling port 20 respectively. When the deviation of the measured SO3 concentration at the third sampling port 19 and the fourth sampling port 20 was less than 5%, the rotary atomizer at the top of the rotary spray drying tower 5 was started to begin the test.

[0075] 8) Based on the adsorbent / SO3 equivalent ratio set in the experiment, calculate the flow rate of the adsorbent solution / slurry. Start the slurry pump 10, adjust the opening of the first ball valve 11 to make the flow rate of the adsorbent solution / slurry reach the set value, and after stabilizing for 5 minutes, take SO3 samples at the third sampling port 19 and the fourth sampling port 20 respectively, and measure the SO3 concentration. After sampling, turn off the slurry pump 10.

[0076] 9) Based on the SO3 concentrations measured in steps 7) and 8), calculate the SO3 removal rate at different locations (dwell time) along the process.

[0077] 10) Adjust the hot air temperature setting value, repeat steps 7) to 9), and measure the SO3 removal rate at different temperatures and different adsorbent / SO3 equivalent ratios;

[0078] 11) At the end of the test, close the pressure reducing valve 13, SO3 generator 14, second ball valve 15, and third ball valve 16 in sequence. Rinse the SO3 adsorbent solution / slurry pipeline with clean water to remove any residue. Then, turn off the electric heater 4 and the rotary atomizer at the top of the rotary spray drying tower 5. After the hot air temperature drops below 50°C, turn off the water film dust collector 8, blower 1, and induced draft fan 7.

[0079] This invention allows for the measurement of the actual SO3 removal effect of adsorbents in multiple physical forms simply by changing the location of SO3 addition. It is highly versatile and easy to operate.

[0080] Any parts or structures not specifically described in this invention can be made using existing technologies or products, and will not be elaborated upon here.

[0081] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A test apparatus for evaluating the SO3 removal efficiency of adsorbents in multiple physical forms, characterized in that, include: A flue gas simulation device is used to provide flue gas at a set temperature; SO3 generating apparatus, used to provide SO3; An SO3 adsorbent supply device is used to provide SO3 adsorbent solution or slurry, and the SO3 adsorbent supply device is connected to a flue gas simulation device; The SO3 generation device is connected to different ports of the flue gas simulation device to measure the SO3 removal rate of the molten / slurry SO3 adsorbent or the SO3 removal rate of the dry powder SO3 adsorbent. The flue gas simulation device includes a blower, a silencer, a gas-to-gas heat exchanger, an electric heater, a rotary spray drying tower, a cyclone dust collector, an induced draft fan, and a water film dust collector. The blower, silencer, and gas-to-gas heat exchanger are arranged sequentially along the gas inflow direction. The outlet of the gas-to-gas heat exchanger is connected to the inlet of the electric heater and the cyclone dust collector. The outlet of the rotary spray drying tower is connected to the inlet of the gas-to-gas heat exchanger. The inlet of the rotary spray drying tower is connected to the outlet of the electric heater. The gas-to-gas heat exchanger is connected to the cyclone dust collector. The cyclone dust collector, induced draft fan, and water film dust collector are arranged sequentially along the gas inflow direction. The SO3 generating device includes an SO2 standard gas cylinder, a pressure reducing valve, an SO3 generator, a second ball valve, and a third ball valve. The SO2 standard gas cylinder, the pressure reducing valve, and the SO3 generator are connected in sequence. The SO3 generator is connected to the inlet of the rotary spray drying tower of the flue gas simulation device through the second ball valve, and the SO3 generator is connected to the outlet of the rotary spray drying tower through the third ball valve. When measuring the SO3 removal rate of the soluble / slurry-state SO3 adsorbent, the second ball valve is open and the third ball valve is closed. When measuring the SO3 removal rate of the dry powder-state SO3 adsorbent, the second ball valve is closed and the third ball valve is open. The SO3 adsorbent supply device includes a solution / slurry tank, a slurry pump, and a first ball valve. The solution / slurry tank is connected to the rotary spray drying tower of the flue gas simulation device through the slurry pump and the first ball valve.

2. The experimental apparatus for evaluating the SO3 removal effect of adsorbents with multiple physical forms according to claim 1, characterized in that, A flow meter is installed at the outlet of the silencer, a temperature meter and a pressure meter are installed at the outlet of the electric heater, and a pressure meter is installed on the rotary spray drying tower.

3. The experimental apparatus for evaluating the SO3 removal effect of adsorbents with multiple physical forms according to claim 1, characterized in that, A flow meter is installed at the outlet of the pressure reducing valve, and a temperature meter is installed at the outlet of the SO3 generator.

4. The method of using the experimental apparatus for evaluating the SO3 removal effect of multi-physical adsorbents according to any one of claims 1-3, characterized in that, When measuring the SO3 removal rate of a slurry / liquid SO3 adsorbent, the following steps are included: 1) Prepare the SO3 adsorbent solution / slurry required for the experiment, store it in the solution / slurry tank, and start the agitator in the solution / slurry tank to prevent the adsorbent from precipitating or settling, and keep the first ball valve closed; 2) Prepare standard SO2 gas, keep the pressure reducing valve, the second ball valve, and the third ball valve closed, and start the SO3 generator to preheat; 3) Start the frequency converter, adjust the speed of the blower and the induced draft fan to make the air flow reach the set value, and maintain a slight negative pressure of about -200Pa inside the rotary spray drying tower; 4) Start the electric heater to bring the hot air temperature to the set value; 5) After the SO3 generator has preheated, start the water film dust collector, open the pressure reducing valve, and adjust the pressure to about 0.2 MPa; 6) Based on the SO3 concentration in the hot air, the SO2 concentration in the standard gas, and the SO2 / SO3 conversion rate of the SO3 generator, calculate the required standard gas flow rate and adjust the opening of the second ball valve to make the standard gas flow rate reach the required value. 7) Sampling SO3 was performed at the second, third, and fourth sampling ports respectively. When the deviation of the measured SO3 concentration at the second, third, and fourth sampling ports was less than 5%, the rotary atomizer at the top of the rotary spray drying tower was started to begin the test. 8) Calculate the flow rate of the adsorbent solution / slurry according to the adsorbent / SO3 equivalent ratio set in the experiment, start the slurry pump, adjust the opening of the first ball valve to make the flow rate of the adsorbent solution / slurry reach the set value, and after stabilizing for a period of time, take SO3 samples at the second sampling port, the third sampling port and the fourth sampling port respectively, measure the SO3 concentration, and turn off the slurry pump after the sampling is completed. 9) Based on the SO3 concentrations measured in steps 7) and 8), calculate the SO3 removal rate at different locations along the process. 10) Adjust the hot air temperature setting value, repeat steps 7) to 9), and measure the SO3 removal rate at different temperatures and different adsorbent / SO3 equivalent ratios; 11) At the end of the test, close the pressure reducing valve, SO3 generator, second ball valve and third ball valve in sequence. Rinse the SO3 adsorbent solution / slurry pipeline with clean water to remove any residue. Then turn off the electric heater and the rotary atomizer at the top of the rotary spray drying tower. After the hot air temperature drops below 50°C, turn off the water film dust collector, blower and induced draft fan.

5. The method of using the experimental apparatus for evaluating the SO3 removal effect of multi-physical adsorbents according to any one of claims 1-3, characterized in that, When testing the SO3 removal rate of dry powder SO3 adsorbent, the following steps are included: 1) Store the SO3 adsorbent solution / slurry required for the experiment in the solution / slurry tank, and start the agitator in the solution / slurry tank to prevent the adsorbent from precipitating or settling, and keep the first ball valve closed; 2) Prepare standard SO2 gas, keep the pressure reducing valve, the second ball valve, and the third ball valve closed, and start the SO3 generator to preheat; 3) Start the frequency converter, adjust the speed of the blower and the induced draft fan to make the air flow reach the set value, and maintain a slight negative pressure of about -200Pa inside the rotary spray drying tower; 4) Turn on the electric heater to bring the hot air temperature to the set value; 5) After the SO3 generator has preheated, start the water film dust collector, open the pressure reducing valve, and adjust the pressure to about 0.2 MPa; 6) Based on the SO3 concentration in the hot air, the SO2 concentration in the standard gas, and the SO2 / SO3 conversion rate of the SO3 generator, calculate the required standard gas flow rate and adjust the opening of the third ball valve to make the standard gas flow rate reach the required value. 7) Sampling SO3 was performed at the third and fourth sampling ports respectively. When the deviation of the measured SO3 concentration at the third and fourth sampling ports was less than 5%, the rotary atomizer at the top of the rotary spray drying tower was started to begin the test. 8) Calculate the flow rate of the adsorbent solution / slurry according to the adsorbent / SO3 equivalent ratio set in the experiment, start the slurry pump, adjust the opening of the first ball valve to make the flow rate of the adsorbent solution / slurry reach the set value, and after stabilizing for a period of time, take SO3 samples at the third and fourth sampling ports respectively, measure the SO3 concentration, and turn off the slurry pump after the sampling is completed. 9) Based on the SO3 concentrations measured in steps 7) and 8), calculate the SO3 removal rate at different locations along the process; 10) Adjust the hot air temperature setting value, repeat steps 7) to 9), and measure the SO3 removal rate at different temperatures and different adsorbent / SO3 equivalent ratios; 11) At the end of the test, close the pressure reducing valve, SO3 generator, second ball valve and third ball valve in sequence. Rinse the SO3 adsorbent solution / slurry pipeline with clean water to remove any residue. Then turn off the electric heater and the rotary atomizer at the top of the rotary spray drying tower. After the hot air temperature drops below 50°C, turn off the water film dust collector, blower and induced draft fan.

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