Patent EP-2581132-A2 (EP)
Inventor: LEHR MANFRED
IPC: B01J8/06
Filed: 2012-10-12
Abstract: Tube bundle reactor (1) comprises: a bundle of reaction tubes surrounded by a cylindrical reactor shell (6), which forms a shell space, in which the reaction tubes are immersed by a heat carrier; a heat carrier-annular flow channel and a heat carrier-annular return channel, which encloses reactor shell in a respective end region of the cylinder and which is in flow communication with shell space via many casing openings; an external pump (3) whose inlet is connected to heat carrier-annular return channel and outlet is connected to heat carrier-annular flow channel; and a main heat exchanger. Tube bundle reactor (1) comprises: a bundle of reaction tubes surrounded by a cylindrical reactor shell (6), which forms a shell space, in which the reaction tubes are immersed by a heat carrier, where the reaction tubes are traversed by a reaction gas; a heat carrier-annular flow channel and a heat carrier-annular return channel, which encloses the reactor shell in a respective end region of the cylinder and which is in flow communication with the shell space via many casing openings, where at least the annular return channel is free of sub-channels; an external pump (3) whose inlet is connected to the heat carrier-annular return channel and the outlet is connected to the heat carrier-annular flow channel, where the heat carrier circulates in a circuit through the annular flow channel, shell space and the annular return channel; and a main heat exchanger (4) connected externally to the circuit whose outlet is connected to the heat carrier-return channel, where a portion of the heat transfer medium stream is introduced as a via the heat exchanger return flow into the heat carrier-annular return channel. The connection points of the pump and the main heat exchanger are offset from one another to the heat carrier-annular return channel in its longitudinal direction. The heat carrier-annular return channel is divided at the connection point of the main heat exchanger by a partition wall extending transverse to the annular channel longitudinal axis into two annular channel sections, each having a portion connection point for the main heat exchanger to divide the heat exchanger return flow on the two annular channel sections. The quantity ratio of portion of the heat transfer medium stream extending from the main heat exchanger into the annular channel sections mutually corresponds to the length ratio of the two annular channel sections. Each annular channel section comprises at least two devices for generating a rotation of the recycle stream about the longitudinal axis of the annular channel sections. The devices are distributed along the annular channel sections. The pump comprises pump housing with a propeller and the pump housing has a concentric, axially upward region in the inlet of the propeller. A second heat carrier-annular return channel surrounds the upwardly directed portion of the pump housing and many pump housing openings are in fluid communication with the inlet of the propeller, which are distributed uniformly over the circumference of the pump housing. The outlet of the main heat exchanger is connected to the second heat carrier-annular return channel. The pump housing opening forms a dosing device and at least two rows of dosing devices are arranged one above the other in the axial direction of the pump, where the rows open into the pump inlet in the radial direction. The external pump has a propeller having a deflection region on its discharge side from the vertical flow to the horizontal flow, which is formed with walls by the intersection of two cylinders, where one wall extends vertically in the flow direction and the other wall extends horizontally perpendicular in the flow direction.