Deposit estimation device and combustion system control device

A combustion system control device comprising:

• an acquisition unit that acquires a mixing ratio of each of a plurality of types of molecular structures included in a fuel to be used for combustion of a combustion system;
• a soot calculation unit that calculates a soot generation index, representing how likely a soot component is to be generated due to combustion, based on the mixing ratio acquired by the acquisition unit;
• an adhesion index calculation unit that calculates an adhesion index, representing how likely a soluble organic component generated due to combustion is to adhere, based on a value detected by a sensor for detecting a property of a fuel or the mixing ratio acquired by the acquisition unit;
• a deposit amount estimation unit that estimates a deposit amount of a soluble organic component that has adhered to a predetermined portion of the combustion system, based on the soot generation index calculated by the soot calculation unit and the adhesion index calculated by the adhesion index calculation unit;
• and
• a control unit that controls the operation of the combustion system so as to reduce the deposit amount in accordance with the deposit amount estimated by the deposit amount estimation unit.