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-   -   DIY Venturi Cold Smoker (http://www.homebrewtalk.com/f51/diy-venturi-cold-smoker-320916/)

geniz 04-13-2012 06:37 PM

DIY Venturi Cold Smoker
I wanted to cold smoke some malt with oak for a Grodziskie I'm making. After looking around the inter web, I decided to make my own venturi cold smoke generator. This is not a new idea, but I don't think anyone has posted a DIY here on how to do it.

The venturi smoke generator uses a metal jar in which wood chips are placed. A few wood chips are lit to produce a smolder. An aquarium pump is used to drive the smoke out a pipe into a smoker. Since the smoke generator is separate from the smoker, it produces a cold smoke. When you are smoking malt, you want a cold smoke so that you don't get roast characteristics in your grain, just the smoke flavor.

So for my project, I used an old SS cocktail shaker as the jar, a few pieces of 1/2" copper pipe and a few fittings to make the smoke generator.

geniz 04-13-2012 06:39 PM

The first thing I did was to drill a hole into the cap of the cocktail shaker and insert a 1/2" copper pipe to 1/2" MIP fitting. I used a 1/2" conduit nut to secure it in place:



geniz 04-13-2012 06:41 PM

Here is the cap on the cocktail shaker:


geniz 04-13-2012 06:44 PM

I drilled some 1/8" holes on the side of the shaker as a lighting hole. I drilled some holes on the bottom as air vents and I drilled holes and used some nuts as feet to hold the shaker off the ground:




geniz 04-13-2012 06:47 PM

Out of the top of the shaker lid I put a small length of 1/2" copper pipe. This went to a tee. In front of the tee was another length of 1/2" pipe that fit into another 1/2" pipe to 1/2" MIP adaptor.
On the back side to the tee was the venturi


geniz 04-13-2012 06:55 PM

The venturi was a length of 1/4" OD water line inside of a short length of 1/2" copper pipe. On the end of the copper pipe is a 1/2"MIP to 1/4" compression fitting. The 1/4" water line fits thru the compression fitting and its position inside the 1/2" pipe can be adjusted.


In order for the 1/4" pipe to fit thru the compression fitting, the inside of the compression fitting had to be drilled out with a 1/4" drill bit:



The length of the 1/4" tube is adjusted so that it sits just forward of the tee. An air supply is hooked into the end of the 1/4" pipe and air traveling out of the tube causes a venturi drawing smoke from the shaker thru the pipe


geniz 04-13-2012 06:59 PM

To attach the smoke generator to the smoker, a hole is drilled and a 1/2" MIP to 1/2" copper pipe adaptor is attached. Here it is on my UDS:


Wood chips are placed in the shaker. Here I am using oak chips:


geniz 04-13-2012 07:02 PM

The lid is placed on the shaker and the aquarium pump is hooked up:



The wood chips are lit using a torch aimed at the lighting holes in the side of the shaker:


geniz 04-13-2012 07:04 PM

Here I have taken the pipe out of the UDS so that you can see the smoke generated:


geniz 04-13-2012 07:07 PM

Grain is placed on a screen in the UDS. The grain is wetted with water to help capture the smoke:



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