Small
seawater desalting equipment with an
energy recovery device applicable to a new-energy independent
power grid comprises a
raw water pump and a multi-level filter device. The multi-level filter device is connected with the
raw water pump by a water inlet, a water outlet of the multi-level filter device is connected with a water inlet of a
reverse osmosis membrane by a high-pressure pump, a
branch of a
fresh water outlet of the
reverse osmosis membrane is connected with a cleaning water tank by a pipeline and a water replenishing valve, another
branch of the
fresh water outlet of the
reverse osmosis membrane is connected with
fresh water storage equipment by a pipeline and a water producing valve, a
branch of a high-pressure strong brine outlet of the reverse
osmosis membrane is connected with the cleaning water tank by a pipeline and a cleaning water return valve, another branch of the high-pressure strong brine outlet of the reverse
osmosis membrane is connected with the
energy recovery device, the
energy recovery device and the high-pressure pump share the same coaxial motor, and the motor is connected with a frequency converter. The energy
recovery device connected with the high-pressure pump by the motor is arranged at the high-pressure strong brine outlet of the reverse
osmosis membrane, high-pressure hydraulic power of high-pressure strong brine is converted into
mechanical energy by the device to be used by the motor, energy is recovered, and water producing
energy consumption is effectively reduced.