Multi-strand plant for producing olefins from an oxygenates-containing fluid input mixture comprising the following constituents and assemblies in fluid connection with one another: (a) at least two reactor trains arranged in parallel and operable in parallel, wherein each reactor train comprises: at least one oxygenate-to-olefin reaction zone containing a catalyst active and selective for the conversion of the oxygenates into olefins under oxygenate conversion conditions, means for supplying the oxygenates-containing input mixture to the reaction zone, means for discharging an olefins-containing partial product stream from the reaction zone, means for supplying a gaseous oxygen-containing regenerant to the reaction zone, means for discharging a carbon oxides-containing regeneration offgas from the reaction zone, a thermal recovery apparatus arranged downstream of the reaction zone comprising at least one heat exchanger for performing indirect heat exchange between the product gas discharged from the reaction zone and a cooling fluid, a partial product conduit arranged downstream of the thermal recovery apparatus for discharging the partial product stream from the reactor train, a shutoff device in the conduit path of the partial product conduit for separating a reactor train from downstream plant parts and parallel reactor trains, (b) a connecting device arranged downstream of the individual reactor trains for combining the individual partial product conduits into a complete product conduit, (c) a compressor arranged downstream of the connecting device for compressing the complete product supplied using the complete product conduit, (d) a multi-stage workup apparatus arranged downstream of the compressor for separating the compressed complete product into a plurality of olefin-containing hydrocarbon fractions, (e) wherein furthermore at least one first quench zone for performing direct heat exchange between one or more partial product streams or the complete product stream and a first quenching medium is comprised, wherein the first quench zone is arranged downstream of the thermal recovery apparatus and upstream of the compressor. (a) at least two reactor trains arranged in parallel and operable in parallel, wherein each reactor train comprises: at least one oxygenate-to-olefin reaction zone containing a catalyst active and selective for the conversion of the oxygenates into olefins under oxygenate conversion conditions, means for supplying the oxygenates-containing input mixture to the reaction zone, means for discharging an olefins-containing partial product stream from the reaction zone, means for supplying a gaseous oxygen-containing regenerant to the reaction zone, means for discharging a carbon oxides-containing regeneration offgas from the reaction zone, a thermal recovery apparatus arranged downstream of the reaction zone comprising at least one heat exchanger for performing indirect heat exchange between the product gas discharged from the reaction zone and a cooling fluid, a partial product conduit arranged downstream of the thermal recovery apparatus for discharging the partial product stream from the reactor train, a shutoff device in the conduit path of the partial product conduit for separating a reactor train from downstream plant parts and parallel reactor trains, at least one oxygenate-to-olefin reaction zone containing a catalyst active and selective for the conversion of the oxygenates into olefins under oxygenate conversion conditions, means for supplying the oxygenates-containing input mixture to the reaction zone, means for discharging an olefins-containing partial product stream from the reaction zone, means for supplying a gaseous oxygen-containing regenerant to the reaction zone, means for discharging a carbon oxides-containing regeneration offgas from the reaction zone, a thermal recovery apparatus arranged downstream of the reaction zone comprising at least one heat exchanger for performing indirect heat exchange between the product gas discharged from the reaction zone and a cooling fluid, a partial product conduit arranged downstream of the thermal recovery apparatus for discharging the partial product stream from the reactor train, a shutoff device in the conduit path of the partial product conduit for separating a reactor train from downstream plant parts and parallel reactor trains, (b) a connecting device arranged downstream of the individual reactor trains for combining the individual partial product conduits into a complete product conduit, (c) a compressor arranged downstream of the connecting device for compressing the complete product supplied using the complete product conduit, (d) a multi-stage workup apparatus arranged downstream of the compressor for separating the compressed complete product into a plurality of olefin-containing hydrocarbon fractions, (e) wherein furthermore at least one first quench zone for performing direct heat exchange between one or more partial product streams or the complete product stream and a first quenching medium is comprised, wherein the first quench zone is arranged downstream of the thermal recovery apparatus and upstream of the compressor.