Method and apparatus for burning pulverulent materials

Claim 3

The method according to claim 1 further comprising introducing a fuel into the suspension preheater or a part thereof to at least partially burn the material prior to feeding it into the rotary kiln.

Claim 4

The method according to claim 2 further comprising directing the stream of heated cooling air from the rotary cooling unit to the preheater and passing said stream through a stationary combustion chamber comprising a part of a first section of the suspension preheater, at least partially burning the preheated material before feeding said material to the rotary kiln, and feeding the waste gases from the rotary kiln to a second section of the preheater.

Claim 5

A rotary kiln plant for burning pulverous or granular material comprising a suspension preheater, an inclined rotary kiln and a separate rotary cooler, the rotary cooler having a central cooler tube provided with a plurality of cooler tubes arranged in planetary fashion about the central cooler tube and being connected at one end by at least one duct to the lower end of the rotary kiln and communicating at the other end portion with the suspension preheater, means for directing cooling air to the planetary cooler tubes and from the planetary cooler tubes to the central cooler tube in such a manner that the heated cooling air from said rotary cooler is divided into two streams, means for directing a first stream of said preheated cooling air to the rotary kiln for use as preheated combustion air, means for directing the second stream to the suspension preheater for preheating the material to be burnt in the kiln, and means associated with the rotary kiln for directing the hot product from the kiln to the rotary cooler.

Claim 6

A rotary kiln plant for burning pulverous or granular material comprising a suspension preheater, an inclined rotary kiln and a separate rotary cooler, the rotary cooler having a central cooler tube provided with a plurality of cooler tubes arranged in planetary fashion about the central cooler tube and being connected at one end by at least one duct to the lower end of the rotary kiln and communicating at the other end portion with the suspension preheater, means for directing cooling air to the planetary cooler tubes and from the planetary cooler tubes to the central cooler tube in such a manner that the heated cooling air from said rotary cooler is divided into two streams, means for directing a first stream of said preheated cooling air to the rotary kiln for use as preheated combustion air, means for directing the second stream to the suspension preheater for preheating the material to be burnt in the kiln, and means associated with the rotary kiln for directing the hot product from the kiln to the rotary cooler.

Claim 7

The rotary kiln plant according to claim 4 further comprising means for directing the material burnt in the rotary kiln from the kiln to the cooler unit and for directing heated cooling air from the cooler unit to the kiln in countercurrent flow.

Claim 8

The rotary kiln plant according to claim 4 further comprising means for directing the material burnt in the rotary kiln from the kiln to the cooler unit and for directing heated cooling air from the cooler unit to the kiln in countercurrent flow.

Claim 9

The rotary kiln plant according to claim 4 wherein the preheater further comprises a stationary combustion chamber for at least partially burning the preheated material prior to feeding it to the rotary kiln.

Claim 10

The rotary kiln plant according to claim 4 wherein the preheater further comprises a stationary combustion chamber for at least partially burning the preheated material prior to feeding it to the rotary kiln.

Claim 11

The rotary kiln plant according to claim 5 wherein the preheater further comprises a stationary combustion chamber for at least partially burning the preheated material prior to feeding it into the rotary kiln.

Claim 12

The rotary kiln plant according to claim 6 wherein the preheater further comprises a stationary combustion chamber for at least partially burning the preheated material prior to feeding it to the rotary kiln.

Claim 13

The rotary kiln plant according to claim 4 further comprising means for mounting the rotary kiln above the rotary cooler unit and means for directing a stream of heater cooling air to at least one of the preheater and combustion chamber.

Claim 14

The rotary kiln plant according to claim 8 further comprising means for mounting the rotary kiln above the rotary cooler unit and means for directing a stream of heater cooling air to at least one of the preheater and combustion chamber.

Claim 15

The rotary kiln plant according to claim 9 further comprising means for mounting the rotary kiln above the rotary cooler unit and means for directing a stream of heater cooling air to at least one of the preheater and combustion chamber.

Claim 16

The rotary kiln plant according to claim 10 further comprising means for mounting the rotary kiln above the rotary cooler unit and means for directing a stream of heater cooling air to at least one of the preheater and combustion chamber.

Claim 17

The rotary kiln plant according to claim 4 wherein said preheater is divided for gas passage therethrough into two units having means for individually regulating the divided heated cooling air streams through the rotary cooler and through the divided preheater.

Claim 18

The rotary kiln plant according to claim 4 wherein said preheater is divided for gas passage therethrough into two units having means for individually regulating the divided heated cooling air stream through the rotary cooler and through the divided preheater.

Claim 19

The rotary kiln plant according to claim 5 wherein said preheater is divided for gas passage therethrough into two units having means for individually regulating the divided heated cooling air streams through the rotary cooler and through the divided preheater.

Claim 20

The rotary kiln plant according to claim 7 wherein said preheater is divided for gas passage therethrough into two units having means for individually regulating the divided heated cooling air streams through the rotary cooler and through the divided preheater.

Claim 21

The rotary kiln plant according to claim 11 wherein said preheater is divided for gas passage therethrough into two units having means for individually regulating the divided heated cooling air streams through the rotary cooler and through the divided preheater.

Claim 22

The rotary kiln plant according to claim 7 wherein said rotary cooler communicates with the suspension preheater by a duct means connected to said other end portion of said cooler and to said stationary combustion chamber.

Claim 23

The rotary kiln plant according to claim 8 wherein said rotary cooler communicates with the suspension preheater by a duct means connected to said other end portion of said cooler and to said stationary combustion chamber.

Claim 24

The rotary kiln plant according to claim 9 wherein said rotary cooler communicates with the suspension preheater by a duct means connected to said other end portion of said cooler and to said stationary combustion chamber.

Claim 25

The rotary kiln plant according to claim 10 wherein said rotary cooler communicates with the suspension preheater by a duct means connected to said other end portion of said cooler and to said stationary combustion chamber.

Claim 26

A rotary kiln plant for burning pulverous or granular raw material comprising a suspension preheater, an inclined rotary kiln and a separate rotary cooler unit, the rotary cooler unit having a central cooler tube provided with a plurality of cooler tubes arranged in planetary fashion about the central cooler tube and being connected at one end by at least one duct to the material output end portion of the rotary kiln and communicating at the other end with the suspension preheater, the cooler unit further being connected to a stationary combustion chamber for at least partially burning the raw material prior to feeding it into the suspension preheater, means for directing cooling air to the planetary cooler tubes and from the planetary cooler tubes to the central cooler tube in a manner such that the heated cooling air from said rotary cooler is divided into two streams, means for directing a first stream of said preheated cooling air to the rotary kiln as preheated combustion air, means for directing the second stream of preheated cooling air to the preheater, and means associated with the rotary kiln for directing the hot product from the kiln to the rotary cooler.

Claim 27

A rotary kiln plant for burning pulverous or granular raw material comprising a suspension preheater, an inclined rotary kiln and a separate rotary cooler unit, the rotary cooler unit having a central cooler tube provided with a plurality of cooler tubes arranged in planetary fashion about the central cooler tube and being connected at one end by at least one duct to the material output end portion of the rotary kiln and communicating at the other end with the suspension preheater, the cooler unit further being connected to a stationary combustion chamber for at least partially burning the raw material prior to feeding it into the suspension preheater, means for directing cooling air to the planetary cooler tubes and from the planetary cooler tubes to the central cooler tube in a manner such that the heated cooling air from said rotary cooler is divided into two streams, means for directing a first stream of said preheated cooling air to the rotary kiln as preheated combustion air, means for directing the second stream of preheated cooling air to the preheater, and means associated with the rotary kiln for directing the hot product from the kiln to the rotary cooler.

Claim 28

The rotary kiln plant according to claim 24 wherein said rotary cooler communicates with the suspension preheater by a duct connected to a central cooler tube at said other end portion of said cooler and to a lower portion of said stationary combustion chamber.