A method for sintering and curing inner cylinder hanging piece of a castable preheater and inner cylinder hanging piece

Abstract

The invention discloses a method for sintering and curing a castable preheater inner cylinder hanging piece and an inner cylinder hanging piece, and the technical field of preheater inner cylinder preparation. The inner cylinder hanging piece of the invention effectively improves the technical problem of insufficient hanging piece strength by reasonable control of the process during sintering and curing, combined with the specific form of the inner cylinder hanging piece.

Description

Technical Field

[0001] The invention relates to the technical field of preparing inner cylinders of preheaters, and more specifically to a method for sintering inner cylinder hanging pieces of a castable preheater and the inner cylinder hanging pieces. Background Art

[0002] In the cement production industry, the inner cylinder of the preheater is an important equipment to ensure the normal production of cement. In the rotary kiln preheater for cement production, the preheater needs to provide multi-stage co-current heat exchange for the raw material powder and the hot air at the kiln tail so that the raw material powder can finally enter the rotary kiln for calcination. The inner cylinder can provide sufficient dispersion time for the raw material powder. During this process, the working environment of the inner cylinder is very harsh, and its internal temperature can reach 1000℃. It needs to withstand the erosion of high-speed dust and corrosion of acid and alkali oxides, and faces high temperature, alkali steam, sulfur steam and high-speed erosion of powder.

[0003] Most of the existing preheater inner barrels are of the hanging plate type, which has the advantages of convenient transportation and assembly. At present, the hanging plate preheater inner barrel mainly includes heat-resistant steel hanging plates and ceramic hanging plates, but it also has many problems: the heat-resistant steel hanging plates are assembled and spliced ​​from castings, and have low sealing effect and poor corrosion resistance, resulting in high energy consumption and short service life. Generally, the replacement cycle of C5 inner barrels is 12 months or 18 months; although the ceramic inner barrel hanging plates have good wear resistance, high temperature resistance and corrosion resistance, the biggest defect is that they are made of pure ceramic materials and have poor impact resistance, resulting in the need to repair damaged parts within a certain period of use; in summary, the existing hanging plate preheater has a short service life, and the inner barrel needs to be replaced after a period of use, which not only increases the equipment cost of the cement plant, but also causes great losses due to the shutdown caused by the replacement process.

[0004] Therefore, the applicant creatively made the castable material into a single hanging piece, and then assembled it modularly to form the inner tube of the preheater. However, since the inner tube of the cement preheater is generally suspended, the single hanging piece needs to withstand a large gravity, which places high requirements on the strength of the hanging piece itself. The hanging piece formed by the existing pouring and curing method is difficult to form a hanging piece with sufficient tensile strength and sufficient wear resistance. The sintering process has a great influence on the service life. The basic principle should be that the heating rate should correspond to the possible dehydration and other phase changes and deformation. In certain temperature stages where the above changes occur rapidly, the temperature should be slowly increased or even kept warm for a considerable time. If the sintering is improper or the temperature is directly increased rapidly and put into use, it is very easy to expand and contract due to heat and cold to produce serious cracks, or even loosen and collapse. Therefore, for the modular assembly of a single castable hanging piece to form the inner tube of the preheater, a curing method is urgently needed to improve its tensile strength and wear resistance. Summary of the invention

[0005] The purpose of the present invention is to provide a castable preheater inner cylinder hanging piece sintering method and inner cylinder hanging piece, in view of the fact that the traditional castable curing method in the prior art is difficult to meet the strength requirements of the castable hanging piece in the modular inner cylinder, and the inner cylinder hanging piece is improved by reasonable control of the process during sintering and curing to improve the technical problem of insufficient hanging piece strength.

[0006] In order to achieve the above object, the technical solution provided by the present invention is:

[0007] The present invention discloses a method for sintering an inner cylinder hanging piece of a castable preheater. The method comprises the following steps: sintering the inner cylinder hanging piece after the castable is solidified, and during the sintering heating process, the inner cylinder hanging piece is first sintered at an intermittent temperature increase in a first dehydration temperature range; then, the inner cylinder hanging piece is sintered at an intermittent temperature increase in a transition dehydration temperature range; and finally, the inner cylinder hanging piece is sintered at an intermittent temperature increase in a second dehydration temperature range. The temperature range of the first dehydration temperature range is less than 500°C, the transition dehydration temperature range is 500°C to 560°C, and the second dehydration temperature range is 560°C to 1200°C. A large amount of crystallization water is generated during chemical reaction in the castable, and is slowly discharged during the sintering process, and a large amount of free water and part of bound water are discharged at a low temperature stage. The free water discharge temperature is 130-220℃, free water is still discharged at 430-500℃, and the crystallization water content of the castable at 560℃ is about 10%. Through the intermittent heating in the first dehydration temperature range and the second dehydration temperature range, the free water and crystallization water in the hanging piece can be dehydrated more stably. The continuous heating in the transition dehydration temperature range is conducive to the stable dehydration of the difficult-to-diffuse free water. The overall sintering process can effectively avoid the phase change and deformation in the hanging piece caused by unstable dehydration during the sintering process, which in turn leads to severe cracks due to thermal expansion and contraction, or even loose collapse.

[0008] Preferably, the specific process of intermittent temperature rising sintering in the first dehydration temperature range is: first, the hanging sheet after the castable is solidified is heated to a temperature of 130°C~160°C for insulation; after insulation, it is heated to 200°C~230°C and then heated, then it is heated to 400°C~440°C and then heated, and finally it is heated to 480°C~500°C.

[0009] Preferably, during the continuous heating and sintering process in the transitional dehydration temperature interval, the heating rate of the heating process is 13°C / h~20°C / h; and / or, when the first dehydration temperature interval is heated, the heating rate is 10°C / h~21°C / h; and / or, when the second dehydration temperature interval is heated, the heating rate is 22°C / h~27°C / h. The heating rate of the second dehydration temperature interval is greater than the heating rate of the first dehydration temperature interval. The first dehydration temperature interval is conducive to the stable dehydration of free water. The heating in the second dehydration temperature interval can not only ensure the effective dehydration of crystallization water, but also limit the increase in the temperature difference between the inside and outside of the castable.

[0010] Preferably, the specific process of intermittent temperature rising sintering in the second dehydration temperature range is: first, the inner cylinder is kept warm at a temperature of 560°C~590°C; after keeping warm, it is heated to 740°C~780°C and kept warm, then it is heated to 820°C~870°C and kept warm, and finally it is heated to 1180°C~1200°C.

[0011] Preferably, during the intermittent heating process in the first dehydration temperature range, the intermittent insulation time between each heating is 2h~5h; and / or, during the intermittent heating process in the second dehydration temperature range, the intermittent insulation time between each heating is 3.5h~6.5h; and / or, after the second dehydration temperature range reaches the highest temperature, insulation is performed for 6.5h~9.5h.

[0012] The present invention discloses a method for curing a hanging piece of an inner cylinder of a castable preheater. The castable is firstly cast into a mold to form a hanging piece, and then waits for the hanging piece to be formed. Then, the formed hanging piece is sintered, and the above-mentioned sintering method is adopted. After sintering, the hanging piece is cooled.

[0013] Preferably, after the injection material is cast into the shape of the hanging piece, during the hanging piece forming process, a vibration device is arranged on the mold to make the mold vibrate.

[0014] Preferably, the sintered hanging piece is cooled once and twice, the temperature rate of the first cooling is 18°C~26°C, and after the first cooling to 580°C~615°C, the hanging piece is cooled twice, and the second cooling is carried out in an environment of 20°C~30°C.

[0015] Preferably, during the sintering process, the weight loss rate of the hanging piece is 55%-80% when the temperature is raised to 130°C; and / or, the weight loss rate of the hanging piece is 70%-90% when the temperature is raised to 430°C; and / or, the weight loss rate of the hanging piece is greater than 90% when the temperature is raised to 600°C.

[0016] The inner cylinder hanging piece of the present invention is used for the inner cylinder of a preheater formed by splicing a plurality of hanging pieces. The hanging piece comprises a molding material, and the hanging piece is formed by solidifying the molding material. The sintering method used in the solidification process is the above-mentioned sintering method. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A temperature gradient diagram of a method for sintering a hanging piece in an inner cylinder of a castable preheater according to the present invention;

[0018] Figure 2 It is a schematic diagram of the change of the weight loss rate of the hanging piece during the process of the casting material preheater inner cylinder hanging piece sintering method of the present invention;

[0019] Figure 3 This is a schematic diagram of the upper and lower splicing structure of a hanging piece of the present invention;

[0020] Figure 4 A side view of a hanging piece of the present invention;

[0021] Figure 5 It is a three-dimensional structural schematic diagram of a hanging piece of the present invention from one viewing angle;

[0022] Figure 6 A schematic diagram of the three-dimensional structure of a hanging piece of the present invention from another viewing angle;

[0023] Figure 7 A cross-sectional view and a partial enlarged view of a hanging piece of the present invention;

[0024] Figure 8 A cross-sectional view of a hanging piece of the present invention;

[0025] Fig. 9 A schematic diagram of a hanging plate structure of the present invention;

[0026] Fig.10 A cross-sectional view showing the distribution of internal reinforcing ribs in a hanging plate of the present invention;

[0027] Fig.11 It is a schematic diagram of a hanging piece combination structure of the present invention;

[0028] Fig.12 It is a schematic diagram of the structure of the inner cylinder of the present invention.

[0029] Explanation of the symbols in the schematic diagram:

[0030] 100, hanging piece; 101, upper hanging piece; 102, lower hanging piece; 103, top fixing part of inner tube; 110, upper hanging piece; 111, upper hanging part; 112, first splicing fixing piece; 113, first splicing contact surface; 114, first splicing end surface; 120, connecting piece; 130, lower hanging piece; 131, lower hanging part; 132, second splicing fixing piece; 133, second splicing contact surface; 134, second splicing end surface;

[0031] 200, reinforcement member; 210, upper reinforcement member; 211, upper attachment reinforcement portion; 212, upper reinforcement penetration portion; 220, connection reinforcement member; 222, connection reinforcement pipe penetration portion; 230, lower reinforcement member; 231, lower attachment reinforcement portion; 232, lower reinforcement pipe penetration portion;

[0032] 301, expansion part; 311, upper fixing member; 312, connection part fixing member; 313, lower fixing member;

[0033] 400, molding material;

[0034] 510, first sealing surface; 511, first lower surface; 512, second lower surface

[0035] 520, second sealing surface; 521, first upper surface; 522, second upper surface;

[0036] 531, first positioning member; 532, second positioning member;

[0037] 601, first dehydration temperature interval; 602, transition dehydration temperature interval; 603, second dehydration temperature interval. DETAILED DESCRIPTION

[0038] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the accompanying drawings and embodiments.

[0039] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effects and purposes that can be produced by the present invention, should still fall within the scope of the technical content disclosed by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and so on quoted in this specification are only for the convenience of description, and are not used to limit the scope of implementation. The change or adjustment of their relative relationship should also be regarded as the scope of implementation of the present invention without substantial change of the technical content; in addition, the various embodiments of the present invention are not independent of each other, but can be combined.

[0040] The present invention provides a method for sintering a hanging piece of an inner cylinder of a castable preheater. The inner cylinder after the castable is solidified is sintered. During the sintering temperature rise process, the inner cylinder is first subjected to intermittent temperature rise sintering in a first dehydration temperature interval 601. Specifically, the temperature interval of the first dehydration temperature interval 601 is less than 500°C. The specific process of the intermittent temperature rise sintering in the first dehydration temperature interval 601 is as follows: first, the hanging piece after the castable is solidified is heated to a temperature of 130°C to 160°C and then kept warm; after being kept warm, the hanging piece is heated to 200°C to 230°C and then kept warm; then, the hanging piece is heated to 400°C to 440°C and then kept warm; finally, the hanging piece is heated to 480°C to 500°C. When the first dehydration temperature interval 601 is heated, the heating rate is 10°C / h to 21°C / h; during the intermittent heating process in the first dehydration temperature interval 601, the intermittent insulation time between each heating is 2h to 5h.

[0041] Then, continuous heating and sintering is performed in the transition dehydration temperature interval 602; the transition dehydration temperature interval 602 is 500°C~560°C, and during the continuous heating and sintering process in the transition dehydration temperature interval 602, the heating rate of the heating process is 13°C / h~20°C / h.

[0042] Finally, intermittent temperature rise sintering is carried out in the second dehydration temperature interval 603, and the second dehydration temperature interval 603 is 560℃~1200℃. The specific process of intermittent temperature rise sintering in the second dehydration temperature interval 603 is: first, the inner cylinder is kept warm at a temperature of 560℃~590℃; after keeping warm, it is heated to 740℃~780℃ and then kept warm, and then it is heated to 820℃~870℃ and kept warm, and finally it is heated to 1180℃~1200℃. When the second dehydration temperature interval 603 is heated, the heating rate is 22℃ / h~27℃ / h. During the intermittent heating process in the second dehydration temperature interval 603, the intermittent insulation time between each heating is 3.5h~6.5h. In addition, after the second dehydration temperature interval 603 reaches the highest temperature, it is kept warm for 6.5h~9.5h.

[0043] A large amount of crystal water is produced during the chemical reaction in the castable, which will be slowly discharged during the sintering process, and a large amount of free water and part of the bound water will be discharged at the low temperature stage. The free water discharge temperature is 130-220°C, and free water is still discharged at 430-500°C. The crystal water content of the castable at 560°C is about 10%. Through the intermittent heating in the first dehydration temperature interval 601 and the second dehydration temperature interval 603, the free water and crystal water in the hanging piece can be dehydrated more stably. The continuous heating in the transition dehydration temperature interval 602 is conducive to the stable dehydration of the difficult-to-diffuse free water. The overall sintering process can effectively avoid the phase change and deformation in the hanging piece caused by unstable dehydration during the sintering process, which in turn leads to severe cracks caused by thermal expansion and contraction, and even loose collapse.

[0044] The present invention discloses a method for curing a hanging piece of an inner cylinder of a castable preheater. The castable is firstly cast into a mold to form a hanging piece, and then waits for it to be formed. Then, the formed hanging piece is sintered. The sintering method is the above-mentioned sintering method. After sintering, the hanging piece is cooled.

[0045] In the specific implementation process, after the injection material is poured into the shape of the hanging piece, a vibration device is set on the mold during the hanging piece forming process to make the mold vibrate. During the sintering process, the weight loss rate of the hanging piece is 55%~80% when the temperature is raised to 130℃; and / or, the weight loss rate of the hanging piece is 70%~90% when the temperature is raised to 430℃; and / or, the weight loss rate of the hanging piece is greater than 90% when the temperature is raised to 600℃. In addition, the hanging piece after sintering is cooled once and twice, and the temperature rate of the first cooling is 18℃~26℃. After the first cooling is to 580℃~615℃, the hanging piece is cooled twice, and the second cooling is carried out in an environment of 20℃~30℃.

[0046] Example 1

[0047] In a method for curing a hanging piece of an inner cylinder of a castable preheater of the present embodiment, the specific curing method is: placing the castable in a mold for vibration molding; the parameters of the vibration machine are: amplitude 0.6 mm, frequency 60 Hz, power 2.2 Kw, time 35 s, expelling bubbles in the castable until the castable is fully vibrated, and then vibrating for 4 to 6 times, and standing to obtain a molding material; then placing the molding material and the mold together at room temperature for mold curing for 8 hours to obtain a semi-finished hanging piece; after curing the semi-finished product at room temperature for 24 hours, rapidly heating it in a desktop furnace.

[0048] The specific sintering method is as follows Figure 1 The sintering method temperature gradient diagram is shown. The semi-finished product after the above curing is sintered in a table furnace at the following temperature nodes: 30-130℃, 130-220℃, 220-430℃, 430-560℃, 560-760℃, 760-850℃, 850-1200℃, and then cooled. The cooling process is: 1200-600℃ and 600℃-normal temperature in sequence.

[0049] During the sintering process, the heating time of the hanging piece in the furnace chamber at 130-220℃ is controlled at about 6h, the heating time at 220-430℃ is controlled at about 14h, the heating time at 430-560℃ is controlled at about 9h, the temperature before 560℃ is increased at 15℃ / hour, the heating time at 560-760℃ is controlled at 4h, the heating time at 760-850℃ is controlled at 4h, the heating time at 850-1200℃ is controlled at 14h, and the temperature after 560℃ is increased at 25℃ / hour.

[0050] After the temperature rises to 1200℃, keep it warm for 8h, lift out the hanging piece, put it into the waiting furnace room to cool naturally. When it drops to 600℃, lift it to the furnace platform and cool it to room temperature (about 25℃) before use for 20h.

[0051] In addition, if Figure 2 Schematic diagram of the change of the weight loss rate of the hanging piece. The weight loss rate after drying at 130℃ is 55%~80%. In the temperature range of 220-430℃, the cumulative weight loss rate reaches 70%~90%, indicating that there is more dehydration in the low temperature stage, mainly free water, and some bound water. As the temperature continues to rise, the bound water and crystal water are continuously removed. When it reaches 600℃, the water content of the castable is only about 10%. By ensuring that the first dehydration temperature interval 601 is slowly and intermittently heated and kept warm, the heating rate of the second dehydration temperature interval 603 is 25℃ / h. In addition, the heating rate of the second dehydration temperature interval 603 is greater than the heating rate of the first dehydration temperature interval 601. The first dehydration temperature interval 601 is conducive to the stable dehydration of free water. The heating of the second dehydration temperature interval 603 can not only ensure the effective dehydration of crystal water, but also limit the increase of the temperature difference between the inside and outside of the castable.

[0052] In addition, during sintering, the temperature measurement point is set at the thermocouple position, where the baking temperature is the highest and the heating speed is the fastest. At the same time, the end face of the thermocouple should be flush with the working surface of the liner or indented about 5mm, so that it can truly represent the liner temperature, that is, the insulation temperature. The temperature difference of the thermocouple should be less than 80℃, otherwise the insulation time will be extended.

[0053] After curing by the curing method of this embodiment, the load-bearing capacity of a single hanging piece is tested by gravity pulling. In this embodiment, the load-bearing capacity of a single hanging piece is 2.5 t.

[0054] An inner cylinder hanging piece of the present invention is used for a preheater inner cylinder formed by splicing a plurality of hanging pieces. The hanging piece includes a molding material 400. The hanging piece is formed by solidifying the molding material 400. The sintering method used in the solidification process is the above-mentioned sintering method.

[0055] In terms of structure, a preheater inner cylinder hanging plate of the present invention comprises an upper hanging member 110, a connecting member 120 and a lower hanging member 130, wherein the upper hanging member 110 and the lower hanging member 130 are connected via the connecting member 120; an upper hanging portion 111 is provided at the bottom of the upper hanging member 110, and a lower hanging portion 131 is provided at the top of the lower hanging member 130;

[0056] The upper hanging part 111 is provided with a first splicing fixing member 112 , and the lower hanging part 130 is provided with a second splicing fixing member 132 ;

[0057] The bottom end of the hanging piece is provided with a first upper table 521 and a second upper table 522, there is a height difference between the first upper table 521 and the second upper table 522, and a second sealing surface 520 is formed between the first upper table 521 and the second upper table 522; the top end of the hanging piece is provided with a first lower table 511 and a second lower table 512, there is a height difference between the first lower table 511 and the second lower table 512, and a first sealing surface 510 is formed between the first lower table 511 and the first upper table 521, and between the second upper table 522 and the second lower table 512. By setting the splicing fixing piece, the splicing strength between the hanging pieces is improved. In addition, since the gap is set between the upper and lower tables, it is convenient to install the hanging piece, and the sealing surface is conducive to ensuring the sealing of the inner cylinder.

[0058] A hanging piece of the present embodiment comprises an upper hanging piece 110, a connecting piece 120 and a lower hanging piece 130, wherein the upper hanging piece 110 and the lower hanging piece 130 are connected via the connecting piece 120; an upper hanging portion 111 is arranged at the bottom of the upper hanging piece 110, and a lower hanging portion 131 is arranged at the top of the lower hanging piece 130; on one side of the hanging piece, the upper hanging portion 111, the connecting piece 120 and the lower hanging portion 131 form a recess, in which a vertical distance L is between the upper hanging portion 111 and the lower hanging portion 131, and L gradually decreases in a direction away from the connecting piece 120; by setting the expansion in the recess, the lower hanging portion 131 is less likely to fall off from the upper hanging portion 111, thereby improving the splicing strength.

[0059] It should be noted that the upper hanging portion 111 and the lower hanging portion 131 are both inclined surfaces facing the connecting member 120 , and the angle between the inclined surface and the horizontal plane is γ, and the range of γ is: 0°<γ≤75°, and in this embodiment, γ=15°.

[0060] The present embodiment provides an upper and lower hanging piece splicing structure of a preheater inner cylinder hanging piece, comprising a first upper table 521 and a second upper table 522 arranged on the upper hanging piece, there is a height difference between the first upper table 521 and the second upper table 522, and a second sealing surface 520 is formed between the first upper table 521 and the second upper table 522; and a first lower table 511 and a second lower table 512 arranged on the lower hanging piece, there is a height difference between the first lower table 511 and the second lower table 512, and a first sealing surface 510 is formed between the first lower table 511 and the second lower table 512; the first sealing surface 510 cooperates with the second sealing surface 520 to seal the hanging piece splicing; through the cooperation of the first sealing surface 510 and the second sealing surface 520 formed as above, the resistance of the airflow directly entering the inner cylinder through the gap between the hanging pieces is greatly improved, thereby effectively improving the sealing performance of the inner cylinder.

[0061] It should be noted that the first upper table 521 corresponds to the first lower table 511; the second upper table 522 corresponds to the second lower table 512. The first upper table 521, the second upper table 522, the first lower table 511 and the second lower table 512 are all arranged horizontally. In addition, the first sealing surface 510 and the second sealing surface 520 are arranged vertically.

[0062] It also includes a positioning member, which includes a first positioning member 531 arranged on the lower hanging plate and a second positioning member 532 arranged on the upper hanging plate. The first positioning member 531 and the second positioning member 532 are arranged in coordination with each other, and the upper hanging plate and the lower hanging plate are positioned by the coordination of the first positioning member 531 and the second positioning member 532.

[0063] It should be noted that the first positioning member 531 is a groove, the second positioning member 532 is a convex block, and the convex block matches the groove; or the first positioning member 531 is a convex block, the second positioning member 532 is a groove, and the groove matches the convex block.

[0064] A hanging piece of the present embodiment comprises an upper hanging piece splicing structure and a lower hanging piece splicing structure, wherein the upper and lower hanging piece splicing structure is the upper and lower hanging piece splicing structure mentioned above, wherein a first upper table 521 and a second upper table 522 are provided at the bottom end of the hanging piece, there is a height difference between the first upper table 521 and the second upper table 522, and a second sealing surface 520 is formed between the first upper table 521 and the second upper table 522; and / or a first lower table 511 and a second lower table 512 are provided at the top end of the hanging piece, there is a height difference between the first lower table 511 and the second lower table 512, and a first sealing surface 510 is formed between the first lower table 511 and the second lower table 512.

[0065] In addition, the top of the hanging piece is provided with a first positioning member 531, and / or the bottom of the hanging piece is provided with a second positioning member 532. The first positioning member 531 is a groove, and the second positioning member 532 is a convex block, and the convex block matches the groove; or the first positioning member 531 is a convex block, and the second positioning member 532 is a groove, and the groove matches the convex block.

[0066] A hanging piece splicing structure of this embodiment includes a first splicing fixing piece 112 and a second splicing fixing piece 132, which can be respectively arranged on two hanging pieces; the first splicing fixing piece 112 and the second splicing fixing piece 132 can cooperate with each other, the first splicing fixing piece 112 is provided with a first splicing contact surface 113, and the second splicing fixing piece 132 is provided with a second splicing contact surface 133, and the first splicing contact surface 113 and the second splicing contact surface 133 are in contact with each other so that the positions of the first splicing fixing piece 112 and the second splicing fixing piece 132 are relatively fixed. Through the cooperation of the first splicing fixing piece 112 and the second splicing fixing piece 132, the hanging piece after hanging is difficult to slide off from the hanging place, and the splicing strength of the hanging piece is effectively improved.

[0067] The first splicing fixing part 112 is a protrusion, and the first splicing contact surface 113 is a side surface of the protrusion; the second splicing fixing part 132 is a groove, and the second splicing contact surface 133 is a groove surface of the groove; the protrusion matches the groove; or the first splicing fixing part 112 is a groove, and the first splicing contact surface 113 is a groove surface of the groove; the second splicing fixing part 132 is a protrusion, and the second splicing fixing part 132 is a side surface of the protrusion; the groove matches the protrusion. It should be noted that the protrusion is in the shape of a column, and the cross-sectional area of ​​the protrusion gradually decreases in the direction away from the surface of the hanging piece, and / or the groove gradually expands in the direction from the inside to the outside, which is conducive to improving the convenience of the hanging process.

[0068] A hanging piece of the present embodiment includes an upper hanging piece 110, a connecting piece 120 and a lower hanging piece 130, wherein the upper hanging piece 110 and the lower hanging piece 130 are connected via the connecting piece 120; an upper hanging portion 111 is provided at the bottom of the upper hanging piece 110, and a lower hanging portion 131 is provided at the top of the lower hanging piece 130; the hanging piece also includes a splicing structure, which is the splicing structure mentioned above; a first splicing fixing piece 112 is provided on the upper hanging portion 111, and / or a second splicing fixing piece 132 is provided on the lower hanging piece 130.

[0069] In addition, the width of the upper hanging member 110 is D1, the width of the connecting member 120 is D2, and the width of the lower hanging member 130 is D3. D1, D2 and D3 satisfy the following relationship: D1>D2, and D3>D2; the upper hanging parts 111 are formed on both sides of the position where the upper hanging member 110 is connected to the connecting member 120, and the lower hanging parts 131 are formed on both sides of the position where the lower hanging member 130 is connected to the connecting member 120.

[0070] A hanging sheet of this embodiment, such as Fig. 9 , 10As shown, it includes a reinforcing member 200 and a molding material 400, wherein the reinforcing member 200 is arranged inside the molding material 400; the hanging piece includes an upper hanging member 110, a connecting member 120 and a lower hanging member 130, wherein the upper hanging member 110 and the lower hanging member 130 are connected via the connecting member 120; the width of the upper hanging member 110 is D1, the width of the connecting member 120 is D2, and the width of the lower hanging member 130 is D3, wherein D1, D2 and D3 satisfy the following relationship: D1>D2, and D3>D2; the upper hanging member An upper hanging part 111 is formed on both sides of the position where 110 is connected to the connecting piece 120, and a lower hanging part 131 is formed on both sides of the position where the lower hanging piece 130 is connected to the connecting piece 120; by applying a reinforcing member to the preheater inner tube hanging piece, the overall strength of the preheater inner tube hanging piece can be improved, and by adopting the above-mentioned hanging piece shape, the upper hanging part of the lower hanging piece can be more stably hung on the lower hanging parts on both sides of the upper hanging piece. This splicing method is conducive to improving the overall splicing strength of the preheater inner tube and improving the overall sealing performance of the preheater inner tube.

[0071] In addition, on one side of the hanging piece, the upper hanging part 111, the connecting member 120 and the lower hanging part 131 form a recess. The length of the upper hanging part 110 is H1, the length of the lower hanging part 130 is H2, and the length of the recess is H3. H1, H2 and H3 satisfy the following relationship: H1+H2≤H3. During the splicing process, this setting is conducive to improving the convenience of hanging the hanging piece. It should be noted that on the same hanging piece, when H2 is the distance between the lower hanging part 131 and the first upper table 521, H1 is the distance between the upper hanging part 111 and the first lower table 511; when H2 is the distance between the lower hanging part 131 and the second upper table 522, H1 is the distance between the upper hanging part 111 and the second lower table 512.

[0072] The reinforcement 200 includes an upper reinforcement 210, a connecting reinforcement 220 and a lower reinforcement 230; the upper reinforcement 210 is correspondingly arranged inside the molding material 400 at the upper hanging portion 111, the connecting reinforcement 220 is correspondingly arranged inside the molding material 400 at the connecting member 120, and the lower reinforcement 230 is correspondingly arranged inside the molding material 400 at the lower hanging portion 131. The upper reinforcement 210 and the lower reinforcement 230 are connected by the connecting reinforcement 220. The upper reinforcement 210 is transversely arranged inside the upper hanging portion 111, and / or the lower reinforcement 230 is transversely arranged inside the lower hanging portion 131. The upper reinforcement member 210 is provided with an upper reinforcement penetration portion 212, and / or the connection reinforcement member 220 is provided with a connection reinforcement penetration portion 222, and / or the lower reinforcement member 230 is provided with a lower reinforcement penetration portion 232. The molding materials 400 on both sides of the reinforcement member 200 are connected through the upper reinforcement penetration portion 212, / or the connection reinforcement penetration portion 222, and / or the lower reinforcement penetration portion 232. The upper reinforcement member 210 is provided with an upper fixing member 311, and / or the connection reinforcement member 220 is provided with a connection portion fixing member 312, and / or the lower reinforcement member 230 is provided with a lower fixing member 313.

[0073] A preheater inner cylinder of the present embodiment comprises a plurality of hanging plates 100 , wherein the hanging plates 100 are a type of hanging plates 100 of the present embodiment, and a plurality of hanging plates 100 are spliced ​​together to form the preheater inner cylinder.

[0074] The hanging piece includes an upper hanging piece 110 and a lower hanging piece 130. Any two upper and lower adjacent hanging pieces 100 are respectively an upper hanging piece 101 and a lower hanging piece 102. The upper hanging piece 110 of the lower hanging piece 102 is matched with the lower hanging piece 130 of the upper hanging piece 101. The lower hanging piece 102 is hung on the upper hanging piece 101 through the cooperation between the upper hanging piece 110 and the lower hanging piece 130. Figure 6 As shown, a preheater inner cylinder of this embodiment has a partial splicing schematic diagram as shown in Fig. 9 As shown; it is composed of a plurality of hanging pieces 100 spliced ​​together, the hanging piece 100 can be produced in a factory and then transported to the construction site for assembly, and its production, transportation and construction processes are relatively convenient.

[0075] A hanging piece in this embodiment is used for a preheater inner cylinder formed by splicing a plurality of hanging pieces. The hanging piece 100 includes a reinforcing member 200 and a molding material 400. The reinforcing member 200 is arranged inside the molding material 400. It should be noted that the molding material 400 here includes a general fluid or flexible castable material that can become a solid material after drying or firing, such as a commonly used refractory castable, or ceramics. The common point of these materials is that they are fluid or flexible before molding, and can be fixed and molded after drying or firing.

[0076] In addition, the reinforcement 200 in the present embodiment can reinforce the internal structure of the molding material 400 in the molding material 400. In the specific production process of the hanging sheet of the present embodiment, the reinforcement 200 can be placed in the mold for producing the hanging sheet, and then the molding material 400 in the flowing state or the flexible state is placed in the mold to make it take the shape of the mold, and then solidified. The solidification method is such as weathering, drying, firing, etc. In the present embodiment, the molding material 400 is a casting material. After the casting material is poured into the mold, it is placed in a heating device for firing and molding, and finally the hanging sheet of the present embodiment is formed.

[0077] The hanging piece 100 includes an upper hanging piece 110 and a connecting piece 120, the connecting piece 120 is connected to the upper hanging piece 110, and the connecting piece 120 is arranged below the upper hanging piece 110; the lower part of the upper hanging piece 110 is provided with an upper hanging part 111; it should be noted that the upper hanging piece 110 is used to hang the hanging piece 100 as a whole on the upper adjacent hanging piece 100 or on the top fixing part 103 of the inner tube, and the top fixing part 103 of the inner tube refers to the inner tube of the preheater, which is reserved for hanging the inner tube of the preheater. In this embodiment, Fig. 9 As shown, it is a fixed ring.

[0078] The hanging piece 100 of this embodiment further includes a lower hanging piece 130, which is connected to the bottom end of the connecting piece 120, and a lower hanging portion 131 is disposed on the upper part of the lower hanging piece 130; in this embodiment, both sides of the upper hanging piece 110 of the hanging piece 100 are provided with upper hanging portions 111, and both sides of the lower hanging piece 130 of the hanging piece 100 are also provided with lower hanging portions 131. Figure 8 As shown in the figure, the hanging piece 100 includes an upper hanging piece 110 and a lower hanging piece 130. Any two upper and lower adjacent hanging pieces 100 are respectively an upper hanging piece 101 and a lower hanging piece 102. The upper hanging piece 110 of the lower hanging piece 102 is arranged in cooperation with the lower hanging piece 130 of the upper hanging piece 101. The lower hanging piece 102 is hung on the upper hanging piece 101 through the cooperation of the upper hanging piece 110 and the lower hanging piece 130. The lower hanging piece 102 is spliced ​​in the same form, and finally constitutes as shown in the figure. Fig.10 The preheater inner cylinder shown in .

[0079] Through the above-mentioned splicing method, except for the topmost and bottommost hanging pieces 100, each hanging piece is fixed to each other by four hanging pieces 100, so the fixing method of each hanging piece is very stable and has very good sealing performance.

[0080] A reinforcement member of this embodiment is used for the preheater inner cylinder hanging piece 100, and the reinforcement member includes an upper reinforcement member 210 and a connecting reinforcement member 220. The lower part of the upper reinforcement member 210 is an upper hanging reinforcement part 211, and the top of the connecting reinforcement member 220 is connected to the upper reinforcement part 210. By arranging the reinforcement member 200 in the molding material 400, the hanging piece 100 has a higher strength as a whole, is not easily damaged in the hanging state, and has a longer service life. The reinforcement member can be made of metal, or other materials with strong rigidity, such as metal ceramics and other materials.

[0081] The upper reinforcement 210 of the reinforcement is correspondingly arranged inside the molding material 400 at the upper hanging part 110, and the connecting reinforcement 220 of the reinforcement is correspondingly arranged inside the molding material 400 at the connecting part 120. The upper reinforcement 210 can reinforce the molding material 400 at the upper hanging part 110, and the connecting reinforcement 220 can reinforce the molding material 400 at the connecting part 120. More importantly, the upper reinforcement 210 and the connecting reinforcement 220 are connected, which can strengthen the connection strength between the molding material 400 at the upper hanging part 110 and the molding material 400 at the connecting part 120, and the upper hanging reinforcement part 211 of the upper reinforcement 210 can effectively reinforce the molding material 400 of the upper hanging part 111, so that the hanging piece 100 has excellent hanging strength, and then the preheater inner tube as a whole has excellent hanging strength, thereby extending the service life of the preheater inner tube.

[0082] In this embodiment, a lower reinforcement member 230 is also included. A lower hanging reinforcement portion 231 is provided on the upper portion of the lower reinforcement member 230. The bottom end of the connecting reinforcement member 220 is connected to the lower reinforcement member 230. The lower reinforcement member 230 can effectively reinforce the molding material 400 at the lower hanging portion 131, which is conducive to further improving the hanging strength of the hanging piece 100. Among them, the setting of the connecting reinforcement member 220 can also further improve the connection strength between the lower reinforcement member 230 and the upper reinforcement member 210, thereby improving the connection strength between the connecting member 120 of the hanging piece 100 and the upper hanging member 110 and the lower hanging member 130, effectively avoiding the connection member 120 from breaking under the action of gravity. The connecting reinforcement member 220 is in the shape of a long strip and / or a plate and / or a rod. In this embodiment, a long strip is used.

[0083] In addition, the reinforcing member 200 is provided with a through-portion, and the molding materials 400 on both sides of the reinforcing member 200 are connected through the through-portion. Through the provision of the through-portion, the molding materials 400 are clamped at the through-portion, which effectively improves the reinforcing effect of the reinforcing member 200 on the molding materials 400. Specifically, in this embodiment, Figure 4As shown, the upper reinforcement member 210 is provided with an upper reinforcement penetration portion 212 , the connecting reinforcement member 220 is provided with a connecting reinforcement penetration portion 222 , and the lower reinforcement member 230 is provided with a lower reinforcement penetration portion 232 .

[0084] Furthermore, a fixing piece may be provided on the reinforcement 200, and the fixing piece protrudes from the surface of the reinforcement 200. The provision of the fixing piece may further improve the direct bonding performance between the molding material 400 and the reinforcement 200, and effectively prevent the molding material 400 from falling off. Specifically, in this embodiment, an upper fixing piece 311 is provided on the upper reinforcement 210, a connecting part fixing piece 312 is provided on the connecting reinforcement 220, and a lower fixing piece 313 is provided on the lower reinforcement 230.

[0085] An expansion portion 301 is provided between the reinforcement 200 and the molding material 400, and the expansion portion 301 allows the reinforcement 200 to expand without squeezing the molding material 400. In the production process of the hanging piece, metal products are one form of the reinforcement 200, but they are prone to thermal expansion effect and easy to expand during firing. Some other casting materials are also prone to expansion during firing. Through the setting of the expansion portion 301, such as a gap, the casting material is prevented from being damaged internally due to internal stress during expansion, thereby ensuring the quality of the hanging piece 100. However, it should be noted that the gap is only one implementation form, and other methods that can have the same effect to avoid expansion damage should belong to the scheme within this range.

[0086] It should be noted that the present invention mentions the cement processing field in the background technology, but the scope of the present invention is not limited to the cement preheater inner cylinder, and the preheater inner cylinders of other reference fields should be within the protection scope of the present invention.

[0087] in addition, Fig.10 The hanging piece in the middle is also provided with a first splicing fixing member 112 and a second splicing fixing member 132 , and the cross-sectional view does not cut through the plane containing the first splicing fixing member 112 and the second splicing fixing member 132 .

[0088] Comparative Example 1

[0089] In a method for curing a hanging piece of an inner cylinder of a castable preheater in this comparative example, the specific curing method is basically the same as that in Example 1, except that the first dehydration temperature interval 601 and the second dehydration temperature interval 603 do not adopt an intermittent heating method, but a continuous heating method. After curing by the curing method of this comparative example, the load-bearing capacity of a single hanging piece is detected by gravity pulling, and the detection process is the same as that in Example 1. The load-bearing capacity of a single hanging piece in this comparative example is 1.76t.

[0090] Comparative Example 2

[0091] In a method for curing a hanging piece of an inner cylinder of a castable preheater in this comparative example, the specific curing method is basically the same as that in Example 1, except that, in the transitional dehydration temperature interval 602 between the first dehydration temperature interval 601 and the second dehydration temperature interval 603, a continuous heating method is not adopted, but an intermittent heating method is adopted. On the basis of Example 1, the temperature is kept at 540°C for 2.5 hours. After curing by the curing method of this comparative example, the load-bearing capacity of a single hanging piece is detected by gravity pulling. The detection process is the same as that in Example 1. The load-bearing capacity of a single hanging piece in this comparative example is 1.57t.

[0092] The present invention has been described in detail above in conjunction with specific exemplary embodiments. However, it should be understood that various modifications and variations may be made without departing from the scope of the present invention as defined by the appended claims. The detailed description and the accompanying drawings should be considered only as illustrative and not restrictive, and if there are any such modifications and variations, they will fall within the scope of the present invention described herein. In addition, the background technology is intended to illustrate the current status and significance of the research and development of the present technology and is not intended to limit the present invention or the application field of the present application and the present invention.

[0093] More specifically, although exemplary embodiments of the present invention have been described herein, the present invention is not limited to these embodiments, but includes any and all embodiments that are recognizable by those skilled in the art based on the foregoing detailed description, such as combinations between the various embodiments, adaptive changes and / or replacements. The limitations in the claims may be interpreted broadly based on the language used in the claims and are not limited to the examples described in the foregoing detailed description or during the implementation of the application, which examples should be considered non-exclusive. Any steps listed in any method or process claim may be performed in any order and are not limited to the order presented in the claim. Therefore, the scope of the present invention should be determined solely by the attached claims and their legal equivalents, rather than by the description and examples given above.

Claims

1. A method for sintering a hanging piece in an inner cylinder of a castable preheater, characterized in that: include: The inner tube after the castable is solidified is sintered. During the sintering heating process, the inner tube is first sintered at an intermittent temperature increase in a first dehydration temperature range (601); then, the inner tube is sintered at an intermittent temperature increase in a transition dehydration temperature range (602); and finally, the inner tube is sintered at an intermittent temperature increase in a second dehydration temperature range (603); the temperature range of the first dehydration temperature range (601) is less than 500°C, the transition dehydration temperature range (602) is 500°C to 560°C, and the second dehydration temperature range (603) is 560°C to 1200°C; During the continuous heating sintering process in the transitional dehydration temperature interval (602), the heating rate of the heating process is 13°C / h~20°C / h; and / or, during the heating in the first dehydration temperature interval (601), the heating rate is 10°C / h~21°C / h; and / or, during the heating in the second dehydration temperature interval (603), the heating rate is 22°C / h~27°C / h; The specific process of intermittent temperature rise sintering in the first dehydration temperature range (601) is as follows: firstly, the temperature of the hanging sheet after the castable is solidified is raised to a temperature of 130°C to 160°C and then kept warm; After the heat preservation, the temperature is raised to 200°C~230°C and then kept warm, then raised to 400°C~440°C and kept warm, and finally raised to 480°C~500°C; The specific process of intermittent temperature rise sintering in the second dehydration temperature range (603) is as follows: first, the inner tube is kept at a temperature of 560°C to 590°C; after the keeping, the temperature is raised to 740°C to 780°C and then kept, then the temperature is raised to 820°C to 870°C and then kept, and finally the temperature is raised to 1180°C to 1200°C; During the intermittent heating process in the first dehydration temperature interval (601), the intermittent insulation time between each heating is 2h~5h; and / or, during the intermittent heating process in the second dehydration temperature interval (603), the intermittent insulation time between each heating is 3.5h~6.5h; and / or, after the second dehydration temperature interval (603) reaches the highest temperature, insulation is performed for 6.5h~9.5h.

2. A method for curing a hanging sheet in an inner cylinder of a castable preheater, characterized in that: First, the casting material is poured into the mold into a hanging sheet shape, and then waited for it to be formed, and then the formed hanging sheet is sintered. The sintering method is the sintering method according to claim 1, and the hanging sheet is cooled after sintering.

3. A method for curing the inner tube hanging sheet of a castable preheater according to claim 2, characterized in that: After the material is poured into the shape of the hanging piece, a vibration device is arranged on the mold during the hanging piece forming process to make the mold vibrate.

4. A method for curing a castable preheater inner cylinder hanging sheet according to claim 2, characterized in that: The sintered hanging piece is cooled once and twice, the temperature rate of the first cooling is 18℃~26℃, after the first cooling to 580℃~615℃, the hanging piece is cooled twice, and the second cooling is carried out in an environment of 20℃~30℃.

5. A method for curing the inner tube hanging sheet of a castable preheater according to claim 2, characterized in that: During the sintering process, when the temperature of the hanging piece is raised to 130°C, the weight loss rate is 55% to 80%; and / or, when the temperature of the hanging piece is raised to 430°C, the weight loss rate is 70% to 90%; and / or, when the temperature of the hanging piece is raised to 600°C, the weight loss rate is greater than 90%.

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