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1. WO2006092005 - HEAT EXCHANGE APPARATUS

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[ EN ]

Claims

1. A heat exchange apparatus comprising an arrangement of relatively small diameter tubes extending substantially longitudinally through a shell, the shell having provided an inlet and an outlet for the ingress and egress of a material from which heat is to be transferred, and the tubes being provided with both an inlet and an outlet for a material to which heat is to be transferred, wherein there are at least two such shell and tube arrangements provided and between which the material to be heated is to be transferred, and a transfer line connecting the at least two shell and tube arrangements, characterised in that the transfer line is provided in a form that discourages settling of solids entrained in the material to be heated.

2. An apparatus according to claim 1 , wherein the transfer line is provided in a form of a gentle arc that facilities the transfer of material therethrough at a velocity higher than the settling velocity of that material.

3. An apparatus according to claim 1 or 2, wherein the transfer line is provided in the form of two 90° elbow fittings provided on neighbouring shell and tube arrangements, between which is provided a spacing member so as to minimise interference of the flow of the material between the shell and tube arrangements.

4. An apparatus according to any one of the preceding claims, wherein the material to be heated contains solids at the level of about 200 g/i.

5. An apparatus according to any one of the preceding claims, wherein the material to be heated has a settling velocity of about 1.5 m/s.

6. A process for the heating of a slurry, the process comprising the method steps of passing the slurry through a series of at least two heat exchange apparatus, the transfer from one apparatus to another being conducted at a velocity above the settling velocity of the slurry.

7. A process according to claim 6, wherein the settling velocity of the slurry is about 1.5 m/s.

8. A process according to claim 6 or 7, wherein the solids content of the slurry is about 200 g/l.

9. A process according to any one of claims 6 to 8 utilising an apparatus as defined in any one of claims 1 to 5.

10. A heat exchange apparatus substantially as hereinbefore described with reference to the accompanying drawings.

11. A process for the heating of a slurry substantially as hereinbefore described with reference to the accompanying drawings.