Designing heat economy for a beet sugar factory with reduced evaporator station load from sugar house vapor intake

The article presents several schemes of evaporator stations designed with reduced sugar house vapors intake. This situation occurs when part of the thick juice is stored in storage tanks or when sugar crystallization from the B product run-off is abandoned and B run-off is used for other purposes.

It has been shown that to achieve the desired d.s. content of thick juice, it is necessary to increase the number of effects in the evaporator station.

A six-effect evaporator station with a full load from the sugar house, operating in a three-stage crystallization scheme without thick juice storage, was adopted as a base.

Seven- and eight-effect evaporator stations were compared with this scheme with a partial load from the sugar house, 78% and 67%, respectively.

The number of evaporator effects and the loads on the individual effects influence the vapor parameters and the size of the heating surfaces. The impact of reducing the mass flow and the pressure of turbine exhaust steam on the power production was analyzed. A six-effect evaporator station is the most suitablefor a sugar factory operating at 100% load from the sugar house. Evaporator stations with seven or even eight effects could be installed in sugar factories operating with thick juice storage or with a reduced number of crystallization stages. It was also shown that due to a significant reduction in steam consumption, the loss of self-sufficiency in power production must be considered.