Energy losses in processing department of sugar production

Abstract

The main energy indicators of a typical scheme of sugar production with a productivity of 3000 tons of sugar per day were given Detailed  analysis was made for the heat consumption of the processing department , which is associated with the need to heat the raw material chips from the initial temperature to the temperature of the diffusion process.  The consumption of heat with the selection of diffusion juice is a regenerative loss, since this heat is not removed from the technological process, but only passes from the diffusion compartment to the juice purification compartment. However, it is desirable to carry out the diffusion process in such a way that the temperature of the diffusion juice is as low as possible, since this makes it possible to more fully use low-potential secondary sources of heat (the heat of steam, condensates and steam from saturators), and also allows to increase the rate of evaporation in the MVU. The largest part of the losses can be heat losses with raw pulp. They reach 75...85% of the heat that was spent on heating the chips to the temperature of the diffusion process. If the raw pulp is diverted to the pulp pit, all this heat is completely lost, and in order to ensure the necessary temperature regime of the diffusion process, it is necessary to compensate for these losses. In order to reduce these heat losses, it is advisable to squeeze out the pulp in presses and return the pulp press water to the diffuse process. Pressing the pulp is expedient both from a technological point of view, as it allows to reduce the loss of sugar in the pulp, and from a thermodynamic point of view, because it allows to reduce the loss of heat with the pulp by 1.5...5 times, depending on the degree of its squeezing. The largest heat input to the diffuse process occurs with feed water - 67...73% of the total amount, which corresponds to almost a third of the entire amount of steam coming from the CHP plant to the sugar factory.