Heat exchanger arrangement for a carbon black production plant

1. A carbon black production plant comprising:

at least one reactor for producing a flue gas and comprising a heat exchange system having a first heat exchange section for heat exchange between the flue gas and a fluid and a second heat exchange section for heat ex-change between the flue gas and reaction air for the reactor,

wherein the reaction air can be preheated by the second heat ex-change section,

wherein said first heat exchange section is designed as a double-tube heat exchanger comprising first tubes each arranged in a single-path configuration in a respective first casing tube, and wherein said second heat exchange section is designed as a tube-bundle heat exchanger comprising a tube bundle which is arranged in a second casing tube and which includes second tubes each arranged in a single-path configuration in the casing tube, said first and second tubes being adapted to have the flue gas flow through them,

wherein said double-tube heat exchanger and said tube-bundle heat exchanger are arranged vertically, wherein the respective upper ends of the first and second tubes are connected to each other via a tube conduit, the flue gas flowing through the double-tube heat exchanger is an ascending direction and through the tube-bundle heat ex-changer in a descending direction.

2. The carbon black production plant of claim 1 , wherein the double-tube heat exchanger is designed as a natural circulation steam generator.

3. The carbon black production plant of claim 2 , wherein the double-tube heat exchanger comprises a vertically standing first entry chamber for the flue gas that has connected to it the first tubes and is delimited by a first lower tube plate accommodating the first tubes.

4. The carbon black production plant of claim 3 , wherein, adjacent to the first lower tube plate, at least one inlet chamber for the fluid is arranged that has the first casing tubes connected to it.

5. The carbon black production plant of claim 1 , wherein the tube-bundle heat exchanger is designed as a counterflow heat exchanger.

6. The carbon black production plant of claim 1 , wherein the tube-bundle heat exchanger is arranged in a suspended manner.

7. The carbon black production plant of claim 1 , wherein the tube-bundle heat exchanger comprises a vertically arranged second entry chamber for the flue gas, said chamber being arranged in an upper end section of the tube-bundle heat exchanger, having the second tubes connected thereto and being delimited by a second upper tube plate accommodating the second tubes.

8. The carbon black production plant of claim 7 , wherein the tube-bundle heat exchanger comprises a vertically arranged second entry chamber for the flue gas, said chamber being arranged in an upper end section of the tube-bundle heat exchanger, having the second tubes connected thereto and being delimited by a second upper tube plate accommodating the second tubes.

9. The carbon black production plant of claim 8 , wherein a second lower tube plate accommodates the lower ends of the second tubes, wherein the second tubes each comprise individual tube compensators for connection with the second lower tube plate.

10. The carbon black production plant of claim 9 , wherein an inlet for the reaction air is arranged adjacent to the second lower tube plate, and/or an outlet for the reaction air is arranged adjacent to the second upper tube plate.