Kiln comprising a protective segment at the kiln outlet
A kiln for firing cement clinker may include a tubular rotary drum that can be rotated about its central axis. The tubular rotary drum may have a discharge end at which the cement clinker leaves the kiln. A protective segment may be attached at the discharge end and may have an outward-facing wear surface and an inward-facing cooling surface. The kiln may include a cooling device for generating a cooling air flow that flows along the inward-facing cooling surface of the protective segment. The inward-facing cooling surface can include profile bodies that are pin-shaped. The profile bodies may be uniformly spaced apart, parallel to one another, and/or present over 20% to 60% of the inward-facing cooling surface.
1. A kiln for firing cement clinker, the kiln comprising:
a tubular rotary drum that is rotatable about a central axis, wherein the tubular rotary drum includes a discharge end at which the cement clinker leaves the kiln;
a protective segment that is attached at the discharge end and includes an outward-facing wear surface and an inward-facing cooling surface, wherein the inward-facing cooling surface includes profile bodies that are pin-shaped, and wherein the profile bodies are spaced apart such that a gap is formed between each two adjoining profile bodies; and
a cooling device for generating a cooling air flow that flows along the inward-facing cooling surface of the protective segment.
2. The kiln of claim 1 wherein the profile bodies have a cross section that is angular, diamond-shaped, or rectangular.
3. The kiln of claim 1 wherein the profile bodies have a cross section that is diamond-shaped or rectangular.
4. The kiln of claim 1 wherein the profile bodies have a cross section that is round.
5. The kiln of claim 1 wherein the profile bodies are uniformly spaced apart.
6. The kiln of claim 1 wherein the profile bodies are parallel to one another.
7. The kiln of claim 1 wherein the profile bodies occupy 20% to 60% of the inward-facing cooling surface.
8. The kiln of claim 1 wherein a portion of the inward-facing cooling surface that includes the profile bodies is at least twice as large as a portion of an inward-facing cooling surface that does not include the profile bodies.
9. The kiln of claim 1 wherein the gaps form an undulating profile.
10. The kiln of claim 1 wherein some of the profile bodies have a first cross section that is round and some of the profile bodies have a second cross section that is angular, diamond shaped, or rectangular.
11. The kiln of claim 1 wherein the cooling device includes a cooling channel for directing the cooling air flow in a direction of the inward-facing cooling surface.
12. The kiln of claim 11 wherein the cooling device includes a guide element that divides the cooling channel into a supply channel for supplying the cooling air flow and a discharge channel for discharging heated cooling air.
13. The kiln of claim 1 wherein the profile bodies have an angular cross section, wherein an edge of each profile body points in a direction of the cooling air flow.