Does tec1-12706 work reverse?
This Peltier device has limits of 100'C because the ignot material (BiSn) melts at 138'C. With this constrain and ideal heat-exchangers it can produce a maximum power with a 70'C differential.  They are delicate devices so the datasheet limits and rules must be followed.

https://www.google.ca/search?client=firefox-b&amp;dcr=0&amp;ei=OyUPWqvdEenZjwTPkZyADQ&amp;q=tec1-12706+generator&amp;oq=tec1-12706&amp;gs_l=psy-ab.1.2.0i71k1l4.0.0.0.257919.0.0.0.0.0.0.0.0..0.0....0...1..64.psy-ab..0.0.0....0.CUXcKJTFB_k