HigginsMechanical
Well-known member
Hey All,
Getting very close to the assembly of my lab. I bought a fume hood, cabinets and acid resistant counter tops in an industrial auction in mid December and I am picking the equipment up after Jan. 23rd. Meanwhile, I've done a basic design for the ventilation and scrubber system. (attached as a .pdf file) Your input and thoughts are greatly appreciated.
The scrubber design is based off of an eductor powered NOx scrubber that someone posted a picture of here on the forum. I cannot remember who submitted the picture and design, nor can I readily find the post... but THANK YOU for the concept!
I decided to use a draft inducer from a condensing gas furnace with a speed controller in lieu of a eductor to draw a vacuum. I was getting pump prices from vendors of $1200- $1400 to allow for the necessary +/- 70' of head at the desired flow rate and pressure to produce the vacuum. I had a few pump professionals look at the design... Now, the pump price drops to around $300.00.
The draft inducer is made out of plastic and is rated for chemical resistance to moist acidic compounds that exist within a condensing furnace's flue gas byproducts. It will be interesting to see how long the draft inducer assembly lasts. The 2" CPVC inlet pipe from the AR hood mounts to the draft inducer assembly with a flange. The outlet of the draft inducer comes as a standard size of 2" PVC, so it fits right into a 2" CPVC male to slip fitting.
The in-line exhaust fan is Continental Fan's M# AXC300B. It is painted with epoxy so it should last. It is readily available on the internet for around $400 with tax and shipping. At a quarter of the price of a corrosion resistant fan, I can afford to go through a few of them if they only last a couple of years.
The container for the soda ash and water mixture is a white or "natural" colored 55 gallon plastic drum with graduations from Grainger. It has sealed heads and (2) 2" threaded ports. The 12" PVC duct mounting flange will have to be notched around the ports. The duct flange will be bolted with nylon fasteners and also sealed with glue.
I'm still working on a suitable tower packing material. Considering tower packing, wiffle balls, hair curlers, cut lengths of hose or tubing... we shall see.
Every motor will have a speed controller and I have several Dwyer magnehelic gauges that will be mounted to monitor pressures. I can't wait to get the system assembled and start smoke testing!
Fittings and pieces and parts have been pouring in; assembly should start shortly. I've been taking pictures to document everything an will share if anyone wants to see the progress.
Getting very close to the assembly of my lab. I bought a fume hood, cabinets and acid resistant counter tops in an industrial auction in mid December and I am picking the equipment up after Jan. 23rd. Meanwhile, I've done a basic design for the ventilation and scrubber system. (attached as a .pdf file) Your input and thoughts are greatly appreciated.
The scrubber design is based off of an eductor powered NOx scrubber that someone posted a picture of here on the forum. I cannot remember who submitted the picture and design, nor can I readily find the post... but THANK YOU for the concept!
I decided to use a draft inducer from a condensing gas furnace with a speed controller in lieu of a eductor to draw a vacuum. I was getting pump prices from vendors of $1200- $1400 to allow for the necessary +/- 70' of head at the desired flow rate and pressure to produce the vacuum. I had a few pump professionals look at the design... Now, the pump price drops to around $300.00.
The draft inducer is made out of plastic and is rated for chemical resistance to moist acidic compounds that exist within a condensing furnace's flue gas byproducts. It will be interesting to see how long the draft inducer assembly lasts. The 2" CPVC inlet pipe from the AR hood mounts to the draft inducer assembly with a flange. The outlet of the draft inducer comes as a standard size of 2" PVC, so it fits right into a 2" CPVC male to slip fitting.
The in-line exhaust fan is Continental Fan's M# AXC300B. It is painted with epoxy so it should last. It is readily available on the internet for around $400 with tax and shipping. At a quarter of the price of a corrosion resistant fan, I can afford to go through a few of them if they only last a couple of years.
The container for the soda ash and water mixture is a white or "natural" colored 55 gallon plastic drum with graduations from Grainger. It has sealed heads and (2) 2" threaded ports. The 12" PVC duct mounting flange will have to be notched around the ports. The duct flange will be bolted with nylon fasteners and also sealed with glue.
I'm still working on a suitable tower packing material. Considering tower packing, wiffle balls, hair curlers, cut lengths of hose or tubing... we shall see.
Every motor will have a speed controller and I have several Dwyer magnehelic gauges that will be mounted to monitor pressures. I can't wait to get the system assembled and start smoke testing!
Fittings and pieces and parts have been pouring in; assembly should start shortly. I've been taking pictures to document everything an will share if anyone wants to see the progress.
