GROUND LIME SLAKING SECTION WITH HEAT PUMP UNIT Russian patent published in 2025 - IPC C04B2/08 C04B2/04 

FIELD: performing operations.

SUBSTANCE: invention relates to lime slaking and air-slaked lime preparation equipment and can be used in construction, chemical water treatment and water treatment systems, as well as chemical, food and metallurgical industries. Ground lime slaking compartment contains installed in the process sequence a quick lime hopper with located in its lower part sluice feeder, air blower for pneumatic transportation of air-lime mixture via pneumatic line to the main hopper, which is equipped in its upper part with a filter for cleaning from lime dust, and in its lower part with a sluice feeder, under which a screw batcher is mounted. At the same time the screw batcher provides uniform supply of quicklime into the downstream hydrator, having three horizontal sections: upper, middle and lower, installed one under the other. At that, on the upper section of the hydrator there is a scrubber for supply of heated water supplied for lime slaking and removal of the removed water steam-gas mixture and lime into cyclone for cleaning of said mixture from non-slaked lime and its return to upper section of hydrator through sluice device of cyclone. Exhaust fan is connected to the cyclone, which removes the steam-gas mixture from hydrator. Under the hydrator there is a hydrated lime screw, which removes lime discharged from the lower section of the hydrator into hydrated lime bin arranged under hydrator. At the same time, compartment additionally comprises steam compression heat pump unit in which in the process sequence installed are air evaporator, liquid evaporator, coolant pipelines and steam outlet pipeline from regenerative heat exchanger. Air evaporator recovers low-potential air heat from the compartment, taken by the fan. Liquid evaporator recycles the heat of the steam from the middle and lower sections of the hydrator formed during quenching. Coolant pipelines exit from air and liquid evaporators and are mounted in a common pipeline, which is connected to the inlet of coolant vapours in regenerative heat exchanger. Steam outlet pipeline from the regenerative heat exchanger is connected to the suction branch pipe of the compressor. At that, the discharge branch pipe of the compressor is connected by a pipeline to the inlet of the coolant vapours into the liquid condenser, from which the outlet of liquid coolant is connected to receiver inlet by pipeline, and the liquid coolant outlet from the receiver is connected to the liquid coolant inlet to the regenerative heat exchanger. Liquid coolant outlet from the regenerative heat exchanger is connected to two temperature control valves, one of which is connected to the inlet liquid coolant into air evaporator, and the second one – with the liquid coolant inlet into the liquid evaporator. Besides, the compartment additionally contains pipelines for supply of liquid coolant by the circulation pump from the liquid evaporator to the heat exchanger built in the middle and lower sections of the hydrator and removal of liquid coolant from the built-in heat exchanger to the liquid evaporator. Besides, the compartment additionally includes heat recovery condenser, condensing steam and removing heat from steam-gas mixture formed during lime slaking. At the same time, heat recovery condenser liquid collector for condensate is installed. To remove carbon dioxide, a decarboniser is installed, which is mounted with a heat recovery condenser by a gas mixture pipeline and having a condensate drain pipe, which together with condensate from the liquid collector is connected by a liquid pipeline to the inlet to the liquid condenser of the heat pump installation for heating water supplied for lime slaking through the scrubber to the upper section of the hydrator.

EFFECT: reduction of heat consumption during lime slaking, as well as reduction of thermal emissions due to heat utilization.

1 cl, 2 dwg