Calcination system and method for the thermal treatment of a substance

Abstract

The present solution relates to a calcining system for the thermal treatment of a substance (12), comprising at least one conveying device (14) with a main extension axis (H); the conveying device (14) having: - at least one thermal treatment volume (18) heated during the thermal treatment by a heating device (16); - a receiving device (22); - a dispensing device (24); - an endless belt device (26) with an upper section (28) and a lower section (30); - a housing system (34, 36, 38.1, 38.2, 40.1, 40.2) comprising an upper housing section (34), a lower housing section (36), two side housing sections (38.1, 38.2) and two end housing sections (40). Furthermore, the present solution relates to a method for the thermal treatment of a substance (12) using the calcining system (10).

Claims

1. A calcination system for the thermal treatment of a substance (12), comprising at least one conveying device (14) with a main extension axis (H); the at least one conveying device (14) having - at least one thermal treatment volume (18) heated by a heating device (16) during the thermal treatment and having a heating temperature (TH) and a cooling volume (20) arranged below the thermal treatment volume (18) and having a cooling temperature (T_K), wherein the heating temperature (T_H) is greater than the cooling temperature (T_K) during the thermal treatment; - a receiving device (22) designed to receive the substance (12) and to convey it at least indirectly into the thermal treatment volume (18); - a discharge device (24) arranged along the main extension axis (H) away from the receiving device (22) and designed to discharge the substance (12) from the conveying device (14) after the thermal treatment;- an endless belt device (26) with an upper run (28) and a lower run (30); wherein the upper run (28) is movable along the main extension axis (H) in a conveying direction (F) from a first run transition device (32.1) to a second run transition device (32.1), and wherein the upper run (28) is designed to convey the substance (12) received by the receiving device (22) and conveyed onto the upper run (28) for thermal treatment in the thermal treatment volume (18); wherein the lower run (30) is movable in correlation with the upper run (28) in the cooling volume (20) along the main extension axis (H) in a return direction (R) opposite to the conveying direction (F) from the second run transition device (34) to the first run transition device (32);- a housing system (34, 36, 38.1, 38.2, 40.1, 40.2) comprising an upper housing section (34), a lower housing section (36), at least two side housing sections (38.1, 38.2) and at least two end housing sections (40); 2. Calcining system according to claim 1, wherein the endless belt device (26) is designed to be substantially closed during the thermal treatment, wherein the endless belt device (26) is preferably designed as a substance carrier (58) composed of segments (58.1) that are arranged one after the other without gaps during the thermal treatment, particularly preferably overlapping; wherein the calcining system (10) has a substance mixing system (68, 70, 72) designed to thoroughly mix the substance (12).

3. Calcining system according to claim 1 or 2, wherein the upper housing section (34), the lower housing section (36), and the two side housing sections (38.1, 38.2) form a substantially closed, in particular rectangular, profile in cross-section relative to the main extension axis (H); wherein the conveying device (14) preferably has at least one air-sealing means (41), in particular one or more rotary valves, wherein the at least one air-sealing means (41) is designed to thermally insulate the receiving device (22) and / or the discharge device (24), in particular in an adjustable manner, from their surroundings; and / or wherein the thermal treatment volume (18) borders the upper housing section (34) and / or the cooling volume (20) borders the lower housing section (36).

4. Calcining system according to at least one of the preceding claims, wherein the at least one conveying device (14) has at least one, in particular substantially continuous, thermal separation layer system (42) between the thermal treatment volume (18) and the cooling volume (20) along the main extension axis (H); wherein the thermal separation layer system (42) is preferably formed at least by the upper run (28) and / or by an insulating surface structure (44).

5. Calcining system according to the preceding claim, wherein the insulating surface structure (44) extending along the main extension axis (H) and transverse to the main extension axis (H) is formed substantially as a plane or substantially as a triangular arch shape with a projection vertex (PSP); wherein the triangular arch shape is preferably formed such that the projection vertex (PSP) is oriented towards the upper housing section (34); and / or wherein the insulating surface structure (44) is preferably formed such that it opens into the two side housing sections (38.1, 38.2) or into the lower housing section (36) in order to substantially enclose the cooling volume (20) together with the lower housing section (36).

6. Calcining system according to at least one of the preceding claims, wherein the at least one conveying device (14) has a housing (46) arranged on the upper housing section (34) and extending along the main extension axis (H) in order to substantially enclose the thermal treatment volume (18) together with the upper run (28); wherein the heating device (16) is preferably arranged in the housing (46), particularly preferably on the inside at the top; and / or wherein the housing (46) preferably has a shorter distance transversely to the main extension axis (H) on the inside and / or outside than the upper housing section (34).

7. Calcination system according to at least one of the preceding claims, wherein the at least one conveying device (14) has an intermediate volume (48) with an intermediate temperature (T_Z) between the upper thermal treatment volume (18) and the lower cooling volume (20), wherein the intermediate temperature (T_Z) during the thermal treatment is a value between the heating temperature (T_H) and the cooling temperature (T_K); wherein preferably the at least one conveying device (14) has at least a first and a second volume separation device, wherein the first volume separation device separates the upper thermal treatment volume (18) from the intermediate volume (48) and wherein the second volume separation device separates the lower cooling volume (20) from the intermediate volume (48);wherein the calcining system (10) is particularly preferably a calcining system (10) according to at least one of claims 4 to 6, and wherein the thermal separation layer system (42) particularly preferably comprises the at least two volume separation devices, wherein the upper run (28) is particularly preferably the first volume separation device and the insulating surface structure (44) is particularly preferably the second volume separation device; 8. Calcining system according to at least one of the preceding claims, wherein the endless belt device (26) comprises: - an abutment structure (50) which is mounted at least indirectly, for example via cross members (52), on the housing system (34, 36, 38.1, 38.2, 40.1, 40.2), in particular on both side housing sections (38.1, 38.2); - a support structure (54) with endless belt movement means (56), preferably with rollers (56.1) and / or traction means (56.2), particularly preferably chain means, wherein the endless belt movement means (56) are designed to move the support structure (54) along the abutment structure (50); - a substance carrier (58) which is designed to convey the substance (12) for thermal treatment in the thermal treatment volume (18) and which is connected to the carrier structure (54), wherein the substance carrier (58) is preferably made up of segments (58.1) which are arranged one after the other without any gaps, particularly preferably overlapping, during the thermal treatment.

9. Calcining system according to the preceding claim, wherein the substance carrier (58) has at least one segment (58.1) with a substance receiving shape, wherein in particular the substance receiving shape is designed substantially as a U-shape; the substance receiving shape having - a horizontally extending support platform (60) with two lateral longitudinal edges (57) parallel to the main extension axis (H), wherein the support platform (60) has successive steps (59), preferably at least one step (59) per segment (58.1), wherein each step extends horizontally substantially transversely to the main extension axis (H), wherein preferably each segment (58.1) with a step (59) has an upper height level (59.1) and a lower height level (59.2), wherein the upper height level (59.1) is arranged at the front in the conveying direction (F); - two vertical planks (62.1, 62.2) extending vertically and each arranged on one of the two longitudinal edges (57).2), wherein the support platform (60) has successive projections (61), preferably at least one projection (61) per vertical plank (62.1, 62.2) of each segment (58.1), wherein each projection (61) extends horizontally substantially transversely to the main extension axis (H).

10. Calcining system according to one of claims 6 or 7 and according to the preceding claim, wherein the housing (46) is designed to be open towards the substance carrier (58) and has a receiving shape correlating with the vertical planks (62.1, 62.2) with two vertical webs (64.1, 64.2), wherein preferably the vertical planks (62.1, 62.2) and the vertical webs (64.1, 64.2) are designed such that their horizontal spacing is selected such that they do not abut one another during the thermal treatment and gap-related heat dissipation is as low as possible; and / or wherein preferably the vertical planks (62.1, 62.2) and the vertical webs (64.1, 64.2) are arranged substantially parallel to one another.

11. Calcining system according to at least one of claims 8 to 10, wherein the endless belt movement means (56) are arranged vertically below the thermal treatment volume (18) and transversely to the main extension axis (H) horizontally offset outwards by a horizontal distance (HA) from the thermal treatment volume (18); wherein preferably the horizontal distance (HA) of the offset of each endless belt movement means (56) from the thermal treatment volume (18) corresponds at least to the length amount (LB) of a corresponding endless belt movement means (56) in the same axis, and / or wherein preferably the horizontal distance (HA) of the offset of each endless belt movement means (56) from the thermal treatment volume (18) is at least 5 percent, preferably at least 7 percent, and particularly preferably at least 10 percent of a horizontal main extension of a segment (58).1) transverse to the main extension axis (H); and / or wherein preferably the horizontal distance (HA) of the offset of each endless belt movement means (56) to the thermal treatment volume (18) is at most 30 percent, preferably at most 25 percent, and particularly preferably at most 15 percent of a horizontal main extension of a segment (58.1) transverse to the main extension axis (H).

12. Calcining system according to at least one of the preceding claims, wherein the at least one conveying device (14) has a thermal treatment volume gas flow system (66, 66.1, 66.2) for gas exchange in the thermal treatment volume (18), the thermal treatment volume gas flow system (66, 66.1, 66.2) having at least one thermal treatment volume gas inflow regulator (66.1) and at least one thermal treatment volume gas outflow regulator (66.2), wherein the thermal treatment volume gas inflow regulator (66.1) is designed to feed gas, for example inert gas or combustion gas, into the thermal treatment volume (18), and wherein the thermal treatment volume gas outflow regulator (66.2) is designed to discharge gas, for example oxygen-containing or moisture-containing gas, from the thermal treatment volume (18); wherein the calcination system (10) is preferably a calcination system (10) according to at least one of claims 6 to 11, wherein the thermal treatment volume gas flow system (66, 66.1, 66.2) is particularly preferably arranged on the housing (46) for gas exchange in the thermal treatment volume (18).

13. Calcination system according to at least one of the preceding claims, wherein the at least one conveying device (14) has a cooling volume gas flow system (67, 67.1, 67.2) for gas exchange in the cooling volume (20), the cooling volume gas flow system (67, 67.1, 67.2) having at least one cooling volume gas inflow regulator (67.1) and at least one cooling volume gas outflow regulator (67.2), wherein the cooling volume gas inflow regulator (67.1) is designed to feed gas, for example inert gas or cooling gas below a defined cooling gas temperature, into the cooling volume (20), and wherein the cooling volume gas outflow regulator (67.2) is designed to feed gas, for example inert gas or cooling gas above a defined cooling gas temperature, out of the cooling volume (20); wherein preferably the calcining system (10) is a calcining system (10) according to at least one of claims 5 to 12, wherein particularly preferably the cooling volume gas flow system (67, 67.1, 67.2) is arranged on the lower housing section (36) or on one or both side housing sections (38.1, 38.2) for gas exchange in the cooling volume (20).

14. Calcining system according to at least one of the preceding claims, wherein the volume of the thermal treatment volume (18) is smaller than the volume of the cooling volume (20) and / or the volume of the intermediate volume (48).

15. Calcining system according to at least one of the preceding claims, wherein the at least one conveying device (14) comprises, as a substance mixing system, at least one circulation system (68) for mixing the substance (12); wherein the at least one circulation system (68) preferably comprises at least one ploughing means (72) fixed to the housing system (34, 36, 38.1, 38.2, 40.1, 40.2), which is designed such that it circulates the substance (12) conveyed on the upper run (28) in the conveying direction (F);and / or wherein preferably the at least one circulation system (68) has at least one roller device (70) whose axis of rotation is arranged transversely to the main extension axis (H), wherein particularly preferably the rotational speed of the at least one roller device (70) is approximately 10 percent, preferably approximately 15 percent, particularly preferably approximately 20 percent, very particularly preferably approximately 25 percent greater than the conveying speed of the endless belt device (26), and / or wherein preferably the conveying speed of the endless belt device (26) is at least 0.03 m / s, particularly preferably at least 0.05 m / s and / or at most 0.3 m / s, particularly preferably at most 0.2 m / s, very particularly preferably at most 0.1 m / s; and / or wherein particularly preferably the at least one roller device (70) has at least one stirring rod construction and / or at least one paddle construction extending radially;wherein preferably the at least one conveying device (14) has at least one homogenizing device (74) which is arranged downstream of the at least one circulation system (68) in the conveying direction (F), wherein the homogenizing device (74) is designed in particular as a cross-beam structure, wherein the at least one homogenizing device (74) is designed to even out the distribution of the substance (12) circulated by the circulation system (68) on the upper run (28); 16. Calcining system according to at least one of the preceding claims, wherein the calcining system (10) has at least two or more successive conveying devices (14) which are arranged in a cascade form relative to one another as a substance mixing system, wherein the discharge device (24) of the at least one preceding conveying device (14) for vertically conveying the substance (12) is preferably connected at least indirectly to the receiving device (22) of the at least one subsequent conveying device (14), for example via a chute construction (76), wherein the chute construction (76) is preferably designed to be substantially gap-free and / or airtight towards the outside.

17. Calcination system according to the preceding claim, wherein the cascade shape is configured such that the main extension axis (H) to the horizon substantially encloses an angle (□, alpha) of at least -5 degrees, preferably at least 0 degrees, particularly preferably at least 10 degrees, very particularly preferably at least 20 degrees; and / or wherein the cascade shape is configured such that the main extension axis (H) to the horizon substantially encloses an angle (□, alpha) of at most 40 degrees, preferably at most 30 degrees, particularly preferably at most 28 degrees, very particularly preferably at most 25 degrees.

18. A method for thermally treating a substance (12) using the calcining system (10) according to at least one of the preceding claims, the method comprising at least the following steps: - receiving the substance (12) by means of the receiving device (22) (100); - conveying the substance (12) on the upper run (28) along the main extension axis (H), wherein the substance (12) for thermal treatment is conveyed at least partially through the heated thermal treatment volume (18), wherein preferably the calcining system (10) has at least the features of claim 15, so that at least one mixing of the substance (12) takes place by means of the at least one circulation system (68);- Dispensing the substance (12) by means of the dispensing device (24) (300), wherein preferably the calcining system (10) has at least the features of claim 16 or 17, so that at least one mixing of the substance (12) takes place by the vertical conveying of the substance (12), in particular essentially as a free fall, from the dispensing device (24) of the at least one preceding conveying device (14) into the receiving device (22) of the at least one subsequent conveying device (14);

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