Single-effect external-cycle concentrator and application thereof

The invention discloses a single-effect external-cycle concentrator and an application thereof. The single-effect external-cycle concentrator comprises a heating chamber 1, an evaporating chamber 2, a separator I 4, a condenser 5, a cooler 6, a separator II 7 and a liquid receiver 8. The heating chamber, the evaporating chamber and the separator I are equipped with online cleaning devices respectively. The single-effect external-cycle concentrator has the advantages of a simple structure, convenience in mounting and dismounting, high evaporating efficiency, capacity of realizing online cleaning and the like, is safe and reliable in a using process, and capable of removing an organic solvent in a bone peptide crude drug liquid better. External-cycle heating is adopted, so that the heated liquid is sprayed after entering the evaporating chamber through a steam vent, and therefore, the evaporating area is increased, the solvent is quickly evaporated, and the concentration time can be shortened. Alcohol residues of the bone peptide drug liquid produced by the single-effect external-cycle concentrator are less than 10mg/ml. The single-effect external-cycle concentrator has the characteristics that a process for producing a bone peptide crude drug is easy to control, the quality of the produced bone peptide crude drug is stable, and the organic solvent residues are less.