The difference of single and triple effect evaporator:

For the single effect evaporator:

it is easy to control the density of the glucose syrup, because some people like the high density, sometimes, it can reach 80%-84%

With lower power, and lower output

For the triple effect evaporator:

it  can save the steam because of the high steam use ratio

Higher power and higher output

Cost much more than single effect evaporator.