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Home / Case Studies / Efficient Nitric Acid Vapor Neutralization for a Solar Panel Manufacturer
Efficient Nitric Acid Vapor Neutralization for a Solar Panel Manufacturer
Select and propose a suitable wet scrubber to meet efficiency and capacity requirements. Provide a budgetary quote with lead time estimates, including optional features such as pH control and pump systems for waste/overflow management.
Task
Nitric acid vapors need neutralization before being exhausted into the outside air. Limited data provided on gas stream parameters.
Problem
Nitric acid tool operation generating vapor emissions.
Production Process
One of the largest manufacturers and installers of solar panels in the USA.
Client
Initial Data
Client Request Description
Nitric acid is a very common acid, and wet scrubbers, as we suspect, are the most commonly used devices for working with this acid. Under normal conditions, it is usually a colorless liquid with a suffocating odor. Nitric acid easily mixes with water and almost completely dissociates into ions, forming an azeotropic mixture.
Density of Nitric Acid Solution Depending on Concentration
A client reached out to us — one of the leading manufacturers and installers of solar panels in the USA — and sent the following request:
We did not have enough information to select the air purification equipment (wet scrubber or adsorber), so we began corresponding with the client for more details.
Client Communication
Client Jon, Engineer:
Looking for a Wet scrubber for a Nitric Acid tool.
Engineer Torch-Air:
Hello, Jonathan
We need the following data:
* The questionnaire is attached.
We need the following data:
- Air Volume
- Temperature
- Composition of pollution
* The questionnaire is attached.
Client Jon, Engineer:
I have attached a copy of the questionnaire that I have filled out to my best abilities. Right now I am looking for a budgetary quote with lead time estimate to get project approval.
Engineer Torch-Air:
I can’t download your file from your drive. Could you attach it to the email instead?
Best regards
Best regards
Client Jon, Engineer:
My apologies, attached the questionnaire.
Engineer Torch-Air:
To select the appropriate scrubber, we need to know the air volume. If that’s not available, we’ll need the diameter of the pipe (duct or vent) where the scrubber will be connected and from which the nitric acid emissions will flow.
Client Jon, Engineer:
I do not have the air volume currently but the diameter of the exhaust pipe is 12”.
Engineer Torch-Air:
If the velocity is 33 ft/s (10 m/s) in a 12-inch diameter pipe, the flow is 1500 CFM, and the nitric acid wet temperature can be up to 35 °C.
We can offer a polypropylene scrubber with a caustic solution as the scrubbing solution.
Nitric acid releases nitrogen oxides. For these oxides, the scrubber should have a low velocity of no more than 1 m/s, and they are poorly absorbed, which is why we have designed the packing height to be higher.
Best regards
We can offer a polypropylene scrubber with a caustic solution as the scrubbing solution.
Nitric acid releases nitrogen oxides. For these oxides, the scrubber should have a low velocity of no more than 1 m/s, and they are poorly absorbed, which is why we have designed the packing height to be higher.
- Air flow rate — 1500 CFM (for nitric acid fumes)
- Weight (dry) — 2000 lbs
- Pump — 3 HP
- Pressure drop — 4" w.c.
Best regards
Tank Vent Scrubber
Engineer Torch-Air:
Good afternoon, we previously discussed selecting a scrubber with you. Do you have any updates on your project? When are you planning to make the purchase? Is there anything else you need from me?
Best regards
Best regards
Client Jon, Engineer:
Hello Anna,
I do have some follow up questions. Can we receive a quote for a similar scrubber at lower capacity in the 470-706 CFM range? Also does this scrubber include any pH control systems? Does the quote include the electrical control panel? Lastly, is the pump listed here for circulation only? Is there a sump pump for waste or overflow?
I do have some follow up questions. Can we receive a quote for a similar scrubber at lower capacity in the 470-706 CFM range? Also does this scrubber include any pH control systems? Does the quote include the electrical control panel? Lastly, is the pump listed here for circulation only? Is there a sump pump for waste or overflow?
Engineer Torch-Air:
↩ Can we receive a quote for a similar scrubber at lower capacity in the 470-706 CFM range?
New proposal attached. Also attached is a drawing in mm.
Volume: 706 cfm
Weight: 500 kg
Temperature range: 40 to 160 ˚F
Pump: 1.5 HP, 208-230/460V
Sump capacity max: 0.45 m³
New proposal attached. Also attached is a drawing in mm.
Volume: 706 cfm
Weight: 500 kg
Temperature range: 40 to 160 ˚F
Pump: 1.5 HP, 208-230/460V
Sump capacity max: 0.45 m³
Updated proposal for Volume 706 cfm.
Engineer Torch-Air:
↩ Also does this scrubber include any pH control systems?
It is included in the standard package.
↩ Does the quote include the electrical control panel?
No, because there is nothing to control there, if there is a pH meter, then there will be a controller and panel.
↩ Lastly, is the pump listed here for circulation only?
Yes
↩ Is there a sump pump for waste or overflow?
A tap is provided for cleaning the tank, a pump can be connected to it or the tank can be drained by gravity.
We can also offer a pumping station for dosing additional liquid into the scrubber if required.
Best regards
It is included in the standard package.
↩ Does the quote include the electrical control panel?
No, because there is nothing to control there, if there is a pH meter, then there will be a controller and panel.
↩ Lastly, is the pump listed here for circulation only?
Yes
↩ Is there a sump pump for waste or overflow?
A tap is provided for cleaning the tank, a pump can be connected to it or the tank can be drained by gravity.
We can also offer a pumping station for dosing additional liquid into the scrubber if required.
Best regards
Client Jon, Engineer:
Good afternoon,
We are still considering the quotes. I believe we will make our choice tomorrow. Your quote is still being considered and is very interesting. I assume my management team will ask me to discuss with you further, the quote is a little light on details. Since I am already writing to you, I thought I might ask a few more questions.
We are still considering the quotes. I believe we will make our choice tomorrow. Your quote is still being considered and is very interesting. I assume my management team will ask me to discuss with you further, the quote is a little light on details. Since I am already writing to you, I thought I might ask a few more questions.
- Do you have an overflow alarm/switch/shutoff?
- Is there a water make-up / water addition system? Or is there a low-level alarm to alert operators/maintenance?
- Is there a PLC or only a pH meter interface?
- What is the pump capacity?
- Your terms state that you only need 45 days lead time. I would like to confirm this is still valid. Would you be able to deliver in April (assuming the purchase order goes through next week at the latest)? We would also be taking the on-site verification service, so a technician would be needed for April as well.
- Is there gas flow verification so that a shutoff/alarm/light is triggered if air no longer flows through the scrubber?
- We have never worked with Torch Air before, so the payment terms were worrisome. We would like to avoid paying 100% of the equipment before receiving it here. Would you be amenable to leaving 10% Net30 after reception? That would mean 50% with PO, 40% at shipping, 10% Net30 after reception. This is to protect us during our first transaction with Torch-Air.
Engineer Torch-Air:
Hello, great
↩ Do you have an overflow alarm/switch/shutoff?
Yes, we have a level sensor with an emergency signal.
↩ Is there a water make-up / water addition system? Or is there a low-level alarm to alert operators/maintenance?
As I mentioned earlier, in this configuration, we have a level sensor, but if you opt for the "Automatic solution feeder," it will include automatic water topping-up.
↩ Is there a PLC or only a pH meter interface?
Ph monitor with Controller.
↩ What is the pump capacity?
1-1/2 HP, 208-230-460 Volt, 60 Hz, 3 Ph (Three Phase)
Design point 35 GPM, 50 psi
↩ Your terms state that you only need 45 days lead time. I would like to confirm this is still valid. Would you be able to deliver in April (assuming the purchase order goes through next week at the latest)? We would also be taking the on-site verification service, so a technician would be needed for April as well.
Yes, we should be able to ship in April if you place the order next week. We can provide an on-site verification service, but we only have one engineer available for site visits, so we will need to schedule the visit date closer to the time, as he is very busy with work.
↩ Is there gas flow verification so that a shutoff/alarm/light is triggered if air no longer flows through the scrubber?
We do not have such a sensor in our standard package, but we will check if there is one available that is resistant to your gas. If we find a suitable option, I will let you know, and if it is not expensive, we will install it ourselves as it is an interesting feature.
↩ We have never worked with Torch Air before, so the payment terms were worrisome. We would like to avoid paying 100% of the equipment before receiving it here. Would you be amenable to leaving 10% Net30 after reception? That would mean 50% with PO, 40% at shipping, 10% Net30 after reception. This is to protect us during our first transaction with Torch-Air.
Yes, we understand; we are often asked for such terms and we agree to them. I just want to clarify that we will request the 40% just before the actual shipment, when the scrubber is ready and has been checked.
↩ Do you have an overflow alarm/switch/shutoff?
Yes, we have a level sensor with an emergency signal.
↩ Is there a water make-up / water addition system? Or is there a low-level alarm to alert operators/maintenance?
As I mentioned earlier, in this configuration, we have a level sensor, but if you opt for the "Automatic solution feeder," it will include automatic water topping-up.
↩ Is there a PLC or only a pH meter interface?
Ph monitor with Controller.
↩ What is the pump capacity?
1-1/2 HP, 208-230-460 Volt, 60 Hz, 3 Ph (Three Phase)
Design point 35 GPM, 50 psi
↩ Your terms state that you only need 45 days lead time. I would like to confirm this is still valid. Would you be able to deliver in April (assuming the purchase order goes through next week at the latest)? We would also be taking the on-site verification service, so a technician would be needed for April as well.
Yes, we should be able to ship in April if you place the order next week. We can provide an on-site verification service, but we only have one engineer available for site visits, so we will need to schedule the visit date closer to the time, as he is very busy with work.
↩ Is there gas flow verification so that a shutoff/alarm/light is triggered if air no longer flows through the scrubber?
We do not have such a sensor in our standard package, but we will check if there is one available that is resistant to your gas. If we find a suitable option, I will let you know, and if it is not expensive, we will install it ourselves as it is an interesting feature.
↩ We have never worked with Torch Air before, so the payment terms were worrisome. We would like to avoid paying 100% of the equipment before receiving it here. Would you be amenable to leaving 10% Net30 after reception? That would mean 50% with PO, 40% at shipping, 10% Net30 after reception. This is to protect us during our first transaction with Torch-Air.
Yes, we understand; we are often asked for such terms and we agree to them. I just want to clarify that we will request the 40% just before the actual shipment, when the scrubber is ready and has been checked.
Proposed Solutions
After a thorough exchange of information with the client, the problem of neutralizing nitric acid vapor emissions was addressed. The selected solution involves a polypropylene wet scrubber equipped with a caustic solution to effectively treat the nitric acid fumes. The scrubber's design ensures optimal performance, even with nitrogen oxide emissions, by maintaining a low gas velocity (under 1 m/s) and increasing the packing height to improve absorption.
Key details of the solution:
Conclusion: The solution offers an efficient and flexible scrubber system with all necessary components for treating nitric acid vapors while considering the client's specific requirements.
Key details of the solution:
- Air flow rate: 706 CFM
- Weight (dry): 500 kg
- Temperature range: 40 to 160 °F
- Pump: 1.5 HP, 208-230/460V
- Sump capacity (max): 0.45 m³
- pH control: Included in the standard package
- Electrical control panel: Not included, as no control is necessary unless a pH meter is required
- Pump for circulation: Included
- Sump pump for waste or overflow: Available via a tap for tank cleaning, with the option to connect a pump or drain by gravity. A dosing station for additional liquid can also be provided if needed.
Conclusion: The solution offers an efficient and flexible scrubber system with all necessary components for treating nitric acid vapors while considering the client's specific requirements.
Updated proposal for Volume 706 cfm.
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Vladimir Nikulin
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