A module shell full-angle rotary kiln waste heat collecting device

Abstract

The utility model discloses a module shell full angle rotary kiln waste heat collecting device, through a plurality of heat collection parts combination realizes 360 full angle coverage in the circumferential direction of cylinder, and the heat collection part includes heat collection pipe, module shell, pipe support, support, fastener. The device has efficient heat collection and convenient maintenance characteristics, and is suitable for high temperature rotary kiln equipment of cement, metallurgy and other industries, can recover the rotary kiln cylinder waste heat in the largest range in winter, is used for heating, reduces fossil energy consumption, and the module shell is convenient to install and detach, can remove the module shell in summer, prevents the rotary kiln cylinder overheating, and the design of module shell is also convenient for the overhaul and maintenance of rotary kiln cylinder wall.

Description

Technical Field

[0001] This invention relates to the field of industrial waste heat recovery technology, specifically to a module shell full-angle waste heat collection device for rotary kilns, which is particularly suitable for waste heat recovery from high-temperature rotary kilns in industries such as cement and metallurgy. Background Technology

[0002] During operation, the rotary kiln continuously loses a significant amount of heat due to the high temperature on its surface. Existing waste heat recovery devices have the following problems:

[0003] Low waste heat recovery rate: Existing heat collection device technologies (CN218097161U, CN102102946A) mostly cover only a local area of ​​the cylinder and do not completely wrap around the circumference of the rotary kiln cylinder, resulting in a low heat recovery rate of the rotary kiln cylinder surface.

[0004] Inadequate cooling measures: The outer shell of existing heat collection devices is mostly integral. If the rotary kiln shell overheats, it is necessary to add blowers or increase the flow rate of cooling medium to cool the rotary kiln shell, resulting in additional energy consumption and production inconvenience. Existing heat collection devices (CN213179374U) use spraying and confluence recovery technology. This method has the disadvantages of complex structure, easy corrosion of rotary kiln shell wall, and inconvenience of disassembly due to the use of tube segments for water collection. Utility Model Content

[0005] To address the aforementioned problems, this utility model proposes a waste heat collection device for a rotary kiln with a fully enclosed modular outer shell. To achieve this objective, this utility model employs the following technical solution:

[0006] This utility model relates to a waste heat collection device for a rotary kiln with a full-angle module shell, comprising several heat collection parts, which are combined to form a 360° full-angle shell in the circumferential direction of the rotary kiln body.

[0007] The heat collection unit 100 includes: a heat collection pipe 110, a module shell 120, a pipe support 130, a bracket 140, and fasteners 150; the heat collection pipe 110 is mounted on the bracket 140 via the pipe support 130 and the fasteners 150; the module shell 120 is mounted on the bracket 140 via the pipe support 130 and the fasteners 150, and they are arranged in the axial and circumferential directions of the rotary kiln.

[0008] Furthermore, the heat collection tube 110 is composed of single tubes 111 spaced apart in the axial or circumferential direction of the rotary kiln body, and the single tubes 111 are connected to each other to form a passage.

[0009] Furthermore, the pipe support 130 has a threaded end and is mounted on the bracket 140 by fasteners 150, which are spaced apart along the extension direction of the single heat collection pipe 111.

[0010] Furthermore, the supports 140 are distributed at intervals in the circumferential and axial directions of the rotary kiln body. The axial supports 141 are connected to the circumferential supports 142. The supports 140 have holes, the positions of which correspond to the end positions of the pipe supports 130 installed on the supports 140.

[0011] Furthermore, the module housing 120 includes, from the inside out: a heat radiation reflective layer 121, a metal housing layer 122, a thermal insulation layer 123, and a protective layer 124.

[0012] Furthermore, the module housing 120 has a hole, the position of which corresponds to the position of the hole in the bracket 140, and the depth of the hole is greater than the length of the tube support 130 that protrudes from the bracket 140.

[0013] Furthermore, the length of the end of several of the tube supports 130 protruding from the bracket 140 is greater than the thickness of the module housing 120, and together with the fasteners 150, the module housing 120 is mounted on the bracket 140.

[0014] Compared with the prior art, the advantages of this utility model are:

[0015] Improved waste heat recovery rate: The waste heat recovery rate of the rotary kiln cylinder surface is improved by combining heat collection parts with a 360° full-wrap angle.

[0016] Easy to install and maintain: The solar collector adopts a modular design, and the solar collector, module shell, etc. can be assembled in a modular manner, which facilitates installation and disassembly and reduces installation and maintenance costs.

[0017] Facilitates cooling of the rotary kiln wall: When the cooling medium in the heat collection tube is insufficient to remove the residual heat from the rotary kiln wall and the rotary kiln wall temperature is too high, the module shell can be easily disassembled to cool the rotary kiln wall. Attached Figure Description

[0018] Figure 1 This is a three-dimensional isometric schematic diagram of the heat collection device of this utility model.

[0019] Figure 2 This is a schematic diagram of the unfolded heat collection tube of this utility model.

[0020] Figure 3 This is a schematic diagram of the assembly of the tube support and outer shell module of this utility model.

[0021] Figure 4 This is a schematic diagram of the bracket of this utility model.

[0022] Figure 5 This is a side view of the heat collection device of this utility model.

[0023] Figure 6This is a schematic diagram of the outer shell module structure of the heat collection device of this utility model.

[0024] 100 - Heat collection section;

[0025] 110 - Heat collector tube, 111 - Single heat collector tube, 112 - U-shaped tube;

[0026] 120-Outer shell module, 121-Heat radiation reflective layer, 122-Metal outer shell layer, 123-Thermal insulation layer, 124-Protective layer, 125-Counterhole, 126-Through hole;

[0027] 130 - Pipe support, 131 - Pipe support with equal end length, 132 - Pipe support with unequal end length;

[0028] 140-bracket, 141-axial bracket, 142-circumferential bracket;

[0029] 150 - Fasteners. Detailed Implementation

[0030] To enhance understanding of this utility model, the following description, in conjunction with the accompanying drawings and specific embodiments, will provide further explanation and illustration, but this does not limit the scope of protection of the present invention.

[0031] As shown in the figure, this embodiment discloses a modular shell full-angle rotary kiln waste heat collection device, which consists of two semi-circular heat collection parts 100, located on the left and right sides of the rotary kiln shell. Each heat collection part 100 has a 180° encirclement angle with the rotary kiln shell, and the two heat collection parts 100 combined create a 360° full encirclement angle in the circumferential direction of the rotary kiln shell. This method achieves 360° full-angle heat collection in the circumferential direction of the rotary kiln shell, improving the waste heat recovery rate of the rotary kiln shell wall. Furthermore, the combination of two heat collection parts 100 facilitates later maintenance and disassembly.

[0032] The heat collection unit 100 includes a heat collection pipe 110, a module housing 120, a pipe support 130, a bracket 140, and fasteners 150.

[0033] The heat collection tube 110 is made of DN100 heat-resistant stainless steel pipe and is installed on the axial support 141 by pipe support 130 and fastener 150. The heat collection tube 111 extends along the circumferential direction of the rotary kiln body and is distributed at 200mm intervals in the axial direction of the rotary kiln body. The tubes 111 are connected to each other by U-shaped tubes 112 to form a passage.

[0034] The pipe supports 130 are U-shaped with threads at both ends. They are mounted on the axial support 141 by fasteners 150 and are spaced apart along the extension direction of the single collector tube 111. Each single tube 111 is equipped with 5 pairs of pipe supports 130, with a circumferential spacing angle of 30°. The pipe supports are divided into pipe supports 131 with equal end lengths and pipe supports 132 with unequal end lengths. The axial support 141 exposed at both ends of the equal end length pipe support 131 is of equal length, with a length of 50mm. The axial support 141 exposed at the shorter end of the unequal end length pipe support 132 is of unequal length, with a length of 50mm at the shorter end and a length of 110mm at the longer end. The module housing 120 is mounted on the support 140 through the longer end of the unequal end length pipe support 132 and the fasteners 150.

[0035] Supports 140 are spaced apart in the circumferential and axial directions of the rotary kiln shell. Axial supports 141 consist of 12 80×80×8mm angle steels evenly distributed along the circumference of the shell. Ten of these are arranged back-to-back in a group, with each group spaced 30° apart in the circumferential direction. The remaining two are located at the upper and lower ends of the semi-circular heat collector. Holes are drilled in the axial supports 141 at the locations where pipe supports need to be placed. The positions of these holes correspond to the positions of the pipe support ends. The threaded ends of the pipe supports can pass through these holes and are then installed on the axial supports 141 using fasteners 150.

[0036] The circumferential support 142 is made of 200X150mm semi-circular H-beams. The grooves of the H-beams are filled with insulation material. The two ends of the axial support 141 are welded to the circumferential support 142. The bottom of the circumferential support 142 is welded to a support, through which the heat collector 100 is mounted on the foundation. The axial spacing of the circumferential supports 142 is set according to the length of the rotary kiln shell. In this embodiment, the spacing between the two circumferential supports 142 is 5m.

[0037] The outer shell of the heat collector is assembled from several modular shells 120. Each modular shell 120 has a layered structure, consisting from the inside out of a heat radiation reflective layer 121, a metal outer shell layer 122, a thermal insulation layer 123, and a protective layer 124. The heat radiation reflective layer 121 is made of 0.5mm polished aluminum plate with a reflectivity ≥85%; the metal outer shell layer 122 is made of 1.5mm galvanized steel plate; the thermal insulation layer 123 is made of 69.2mm aluminum silicate fiber felt with a thermal conductivity ≤0.035W / m·K; and the protective layer 124 is made of 0.8mm aluminized zinc-coated steel plate. The modular shell 120 is 72mm thick and has holes, some of which are countersunk holes 125 with a depth of 52mm, and some are through holes 126, all concentric with the openings in the axial support 141. The modular shell 120 is installed in the groove of the axial support 141 via the longer end of the unequal-length end bracket 132 and fasteners 150. The module housing 120 is closely arranged in the circumferential and axial directions of the heat collection section 100, forming a housing with an enclosing angle of about 180° to the rotary kiln cylinder.

[0038] Taking a 3 million t / a pellet plant as an example, with a rotary kiln shell length of 50m, an average temperature of 250℃, a winter supply water temperature of 80℃, and a return water temperature of 60℃, the radiative heat transfer rate on the surface of the rotary kiln shell can reach 1086170W. Considering a heat loss coefficient of 0.8, using the above-mentioned 5 sets of heat collection devices in series, approximately 37.4 t / h of 80℃ hot water can be generated. Based on a heat load index of 100W / m... 2 For example, the heating area is approximately 8600m². 3 This system meets the factory's winter heating needs. Based on 151 heating days in winter, it can save approximately 550 tons of standard coal, resulting in energy savings of about 500,000 yuan. In summer, the heat collection tubes cool the rotary kiln's cylinder wall. If the kiln cylinder wall becomes overheated, the module's outer shell can be removed without affecting its physical cooling function.

Claims

1. A modular shell fully enclosing rotary kiln waste heat collection device, characterized in that, It includes several heat collection units (100), which are combined to form a 360° full wrap-around angle in the circumferential direction of the rotary kiln cylinder; The heat collection unit (100) includes: a heat collection pipe (110), a module shell (120), a pipe support (130), a bracket (140), and fasteners (150); the heat collection pipe (110) is mounted on the bracket (140) via the pipe support (130) and the fasteners (150); the module shell (120) is mounted on the bracket (140) via the pipe support (130) and the fasteners (150), and is arranged in the axial and circumferential directions of the rotary kiln.

2. The waste heat collection device for a rotary kiln with a fully enclosed modular outer shell according to claim 1, characterized in that, The heat collection tube (110) is composed of single tubes (111) spaced apart in the axial or circumferential direction of the rotary kiln cylinder, and the single tubes (111) are connected to each other to form a passage.

3. The waste heat collection device for a rotary kiln with a fully enclosed modular outer shell according to claim 1, characterized in that, The pipe support (130) has a threaded end and is mounted on the bracket (140) by fasteners (150), and is distributed at intervals along the extension direction of the single heat collection pipe (111).

4. The waste heat collection device for a rotary kiln with a fully enclosed modular outer shell according to claim 1, characterized in that, The brackets (140) are spaced apart in the circumferential and axial directions of the rotary kiln body. The axial bracket (141) is connected to the circumferential bracket (142). The brackets (140) have holes, and the positions of the holes correspond to the positions of the ends of the pipe supports (130) installed on the brackets (140).

5. A waste heat collection device for a rotary kiln with a fully enclosed modular outer shell according to claim 1, characterized in that, The module housing (120) includes, from the inside out: a heat radiation reflective layer (121), a metal housing layer (122), a heat insulation layer (123), and a protective layer (124).

6. A waste heat collection device for a rotary kiln with a fully enclosed modular outer shell according to claim 1, characterized in that, The module housing (120) has a hole, the position of which corresponds to the position of the hole in the bracket (140), and the depth of the hole is greater than the length of the tube support (130) that protrudes from the bracket (140).

7. A waste heat collection device for a rotary kiln with a fully enclosed modular outer shell according to claim 3, characterized in that, Several of the tube supports (130) have an end protruding from the bracket (140) for a length greater than the thickness of the module housing (120), which, together with fasteners (150), mount the module housing (120) onto the bracket (140).

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