Furnace bottom sealing and bearing structure of lime kiln and other roasting kilns and construction method

Abstract

The invention discloses a furnace bottom sealing and bearing structure of a lime kiln and other roasting kilns and a construction method, and relates to the technical field of construction of furnace bottom structures of lime kilns and other roasting kilns. According to the invention, the furnace bottom bearing beam transmits the received force to the upper surface of the reinforced concrete ring beam through the bearing inclined strut; the furnace wall ring beam transmits received force to the upper surface of the reinforced concrete ring beam through the supporting columns, the furnace bottom sealing steel shell, the embedded iron and the like, sealing and consolidation force transmission are completed through a secondary pouring ring, fatigue damage of the furnace bottom sealing steel shell is avoided, a furnace body can resist typhoon of more than 17 levels or 9-degree seismic intensity, and the service life of the furnace body is prolonged. And meanwhile, the sealing capacity of the furnace body exceeds 80 kPa. In addition, each large force is dispersed to the four sealing force transmission systems to be borne together and cooperate with one another, so that the maximum load value of each sealing force transmission system under the special structure condition is reduced, the sealing bearing reliability is improved through the simple structure, and meanwhile investment is saved.

Description

Technical Field

[0001] The invention relates to the technical field of lime kiln and other roasting kiln bottom structure construction technology, in particular to a lime kiln and other roasting kiln bottom sealing load-bearing structure and a construction method. Background Art

[0002] Large vertical furnaces such as blast furnaces or hot blast furnaces are affected by the reaction in the furnace, which can easily cause uneven heating of the furnace shell. In some places, the furnace bottom plate may be tilted up or the furnace shell and the furnace bottom plate may be separated, causing the gas in the furnace to leak out from the gaps, posing a major safety hazard.

[0003] The invention patent with announcement number CN114292977A provides a sealing structure and sealing method for preventing gas leakage from the bottom of a blast furnace. Two rings of sealing shells are arranged outside the cylindrical furnace shell, and the vertical tube of the sealing shell extends into a groove opened in the blast furnace foundation. The groove is provided with a concrete sealing block. The top plate of the first ring sealing shell is a conical plate, and the top plate of the second ring sealing shell is a horizontal ring plate. Casting material is then poured into the two rings of sealing shells, and epoxy resin self-flowing material is pressure-grouted to the bottom sealing plate in the cylindrical furnace shell, forming a three-ring sealing effect.

[0004] The utility model patent with announcement number CN216273930U provides a hot blast furnace foundation structure, in which an arc connection is adopted between the flat bottom steel plate and the straight cylindrical furnace shell, and anhydrous cannon mud is used for ramming material here. A universal circle of embedded bolts is used for tightening the outer periphery of the bottom of the furnace shell. The hot blast furnace foundation is provided with a groove at the corresponding position of the flat bottom steel plate. The bottom surface of the groove is paved with a foundation concrete layer, a thermal insulation layer and a leveling layer from bottom to top, wherein the leveling layer is a sand layer treated by pressure grouting, and the thermal insulation layer is also a spray coating layer and a clay brick layer treated by pressure grouting; thereby reducing the temperature of the main foundation, and making the thermal expansion and contraction of the flat bottom steel plate proceed in a "sliding" state, avoiding local stress concentration.

[0005] The utility model patent with announcement number CN219385186U provides a blast furnace bottom reinforcement structure. Three or more anchor bolt holes distributed around the furnace shell are opened on the concrete foundation, and fastening bolts are implanted in each anchor bolt hole. The fastening bolts are fixed to the blast furnace shell through a fastening mechanism to solve the problem of the furnace shell warping.

[0006] The furnace bottom of the above patent generally includes a complete furnace bottom steel sealing plate connected to the bottom of the cylindrical furnace shell, and there is a "solid" sand layer or concrete layer under the furnace bottom steel sealing plate for uniform support. The transmission of various forces is relatively easy, mainly considering the influence of thermal expansion and contraction. The requirements can be met by fixing with embedded bolts or embedded iron. Most other common furnace bottom force transmission structures also use embedded bolts or embedded iron structures.

[0007] The applicant's existing invention patent, publication number CN104891831A, provides an energy-saving and environmentally friendly active lime roasting vertical kiln (i.e., a central burner TGS lime kiln), which also adopts a universal pre-buried iron sealing force transmission structure with a large burial depth. However, with the progress of large-scale TGS lime kilns, the pressure in the furnace has further increased. In particular, the platform elevation of the furnace top exhaust gas release valve of large-scale TGS lime kilns with a daily output of 900 tons has reached 68 meters. This is a slender and tall special vertical furnace, which also increases the requirements for the sealing load-bearing structure under conditions such as earthquakes and typhoons. The structure of the pre-buried bolts has poor sealing ability and a complex force transmission structure. The pre-buried iron sealing force transmission structure with a large burial depth is prone to force transmission deviation between the support column and the pre-buried iron with a large burial depth due to civil construction errors, making it difficult to meet higher wind resistance, earthquake resistance and sealing requirements, and requires upgrading. Summary of the Invention

[0008] In order to solve the above technical problems, the present invention provides a sealed load-bearing structure and construction method for the bottom of a lime kiln and other roasting kilns to improve the load-bearing capacity.

[0009] The force that the load-bearing components of this solution bear is designed according to the standardized seismic intensity, typhoon level and the maximum force when the charge is sitting. In some areas, typhoons are the main force, and there is a certain probability of overlapping with the charge sitting. This is the first dangerous situation that needs to be dealt with; in other areas, the wind force is relatively low, mainly due to the seismic intensity of 8 degrees or even higher than 9 degrees, and the probability of overlapping with the charge sitting is almost zero. This is the second dangerous situation that needs to be dealt with; the present invention disperses each larger force to the four major sealing force transmission systems to share the responsibility and cooperate with each other, so as to reduce the maximum load value of each sealing force transmission system structure under special conditions, and improve the reliability of the sealing load-bearing with a relatively simple structure while saving investment.

[0010] To achieve this technical purpose, the present invention adopts the following scheme: In the first aspect, the present invention provides a sealed load-bearing structure for the bottom of a lime kiln and other roasting kilns, comprising a bunker-type reinforced concrete foundation, a reinforced concrete ring beam, a first-layer platform of a concrete foundation, a secondary casting ring, and a sealed force transmission system. A reinforced concrete ring beam is cast on the bunker-type reinforced concrete foundation, and a sealed force transmission system is arranged on the reinforced concrete ring beam; the sealed force transmission system is divided into four parts, the first sealed force transmission system comprises a support column, a furnace bottom sealing steel shell and a connecting plate, a support column is fixed on the upper surface of the reinforced concrete ring beam, a furnace bottom sealing steel shell is arranged on the outer side of the support column, and the connecting plate connects the furnace bottom sealing steel shell and the support column into a truss-like integral ring column structure, the lower part of the furnace bottom sealing steel shell and the support column is fixed in the secondary casting ring, and the secondary casting ring is located on the inner side of the first-layer platform of the concrete foundation and fixedly connected to it. ; The second sealed force transmission system includes annular embedded iron, a furnace bottom aggregate hopper and a furnace bottom bellows. The annular embedded iron and the force transmission embedded iron are fixed on the inner side of the reinforced concrete ring beam. The upper side of the force transmission embedded iron is connected to the furnace bottom aggregate hopper, and the furnace bottom aggregate hopper is inserted in the furnace bottom bellows. The furnace top bellows is connected to the cooling air duct; The third sealed force transmission system includes a guide device, a roller and a reciprocating push plate. The reinforced concrete ring beam is connected to a guide device and a roller. The guide device and the roller are movably connected to the reciprocating push plate to support and guide the reciprocating push plate; The fourth sealed force transmission system includes a force transmission chassis, an inclined brace, a load-bearing beam and a large air-cooled composite material central burner. The force transmission chassis is fixed on the reinforced concrete ring beam, the force transmission chassis is fixed with an inclined brace, the load-bearing beam is fixed on the inclined brace, and the large air-cooled composite material central burner is fixed in the center of the load-bearing beam.

[0011] Furthermore, the furnace bottom sealing steel shell and the upper part of the support column are connected with a furnace wall ring beam, a cooling belt hopper is hung on the inner side of the furnace wall ring beam, and the furnace waist steel shell and the furnace body steel shell are fixed on the upper side of the furnace wall ring beam. The furnace waist steel shell and the furnace body steel shell are wrapped with a furnace wall composed of a lightweight insulation material layer and a heavy refractory working layer.

[0012] Furthermore, the system also includes a sealing ring plate, fixedly connected to the upper side of the pre-embedded iron rods on the inner side of the reinforced concrete ring beam, and a furnace bottom hopper suspended from the lower side of the sealing ring plate. The furnace bottom wind box includes an air blower plate and a conical plate, fixedly connected to the inner side of the sealing ring plate. The conical plate is fixed between the lower side of the pre-embedded iron rods and the furnace bottom hopper. Ventilation holes are evenly distributed along the upper edge of the furnace bottom hopper, and a cooling air duct connects to the conical plate to provide cooling air for the furnace bottom wind box. This cooling air effectively prevents the threat of high-temperature products under special furnace conditions to the non-heat-resistant reinforced concrete ring beam.

[0013] Furthermore, the third sealed force transmission system also includes a guide device bracket and a roller bracket. The guide device bracket and the roller bracket are both fixed on the reinforced concrete ring beam. Each bracket is connected to each other to form a polygonal force structure. A rotatable roller is installed on the roller bracket, and the upper surface of the roller is rollingly connected to the lower surface of the reciprocating push plate; a guide rail is provided on the guide device bracket, and a guide device is installed in the guide rail. The guide device is connected to the reciprocating push plate, so that the reciprocating push plate moves back and forth along the set trajectory to prevent deviation and damage to the power device.

[0014] Furthermore, the diagonal braces are divided into load-bearing diagonal braces and auxiliary diagonal braces, and the load-bearing beams are divided into cross beams and herringbone beams. The lower section of the load-bearing diagonal braces is fixedly connected to the force transmission chassis, and the upper section of the load-bearing diagonal braces is fixedly connected to the cross beam; the upper end of the auxiliary diagonal brace is connected to the cross beam, and the lower end of the auxiliary diagonal brace is fixedly connected to the secondary casting ring.

[0015] Furthermore, the outer ends of the cross beam and the herringbone beam pass through the furnace bottom sealing steel shell and are sealed with the furnace bottom sealing steel shell; the inner end of the herringbone beam is connected to the large air-cooled composite material central burner.

[0016] Furthermore, the load-bearing beams, large air-cooled composite central burner, furnace wall ring beam, support columns, load-bearing diagonal braces, and furnace bottom wind box are all hollow structures, connected by ventilation ducts or vents. Cooling air is passed through these components to reduce operating temperatures and prevent burnout.

[0017] In a second aspect, the present invention provides a method for constructing a sealed load-bearing structure at the bottom of a lime kiln or other roasting kiln, comprising the following steps: S1. Cast a bunker-type reinforced concrete foundation on the underground pile foundation, lay out the steel mesh and annular embedded iron of the reinforced concrete ring beam on the bunker-type reinforced concrete foundation, and weld them into an integral cylindrical shape; The upper surface of the reinforced concrete ring beam is provided with pre-buried iron for force transmission, the vertical reinforcement required for the secondary casting ring is embedded in the reinforced concrete ring beam, the reinforced concrete ring beam is cast in the formwork, and the concrete near the vertical reinforcement is roughened; S2. Formwork is supported above the reinforced concrete ring beam to cast the first-floor concrete foundation platform. Spaced-apart tie bars are arranged between the inner and outer reinforcement meshes of the annular reinforced concrete wall below the first-floor concrete foundation platform. The inner sides of the tie bars are bent only into the protective layer. When the formwork is removed after casting the first-floor concrete foundation platform, the tie bars on the inner side of the first-floor concrete foundation platform are straightened and the inner side is roughened. S3. Weld support columns to the pre-embedded force-transmitting iron on the upper surface of the reinforced concrete ring beam, suspend the furnace bottom sealing steel shell over the support columns, weld a sealing ring plate to the lower edge of the furnace bottom sealing steel shell, weld concrete anchor nails to the lower parts of the furnace bottom sealing steel shell and the support columns, install the furnace wall ring beam on the top of the support columns, pull up the furnace bottom sealing steel shell, and weld it to the bottom of the furnace wall ring beam. Use connecting plates to connect the furnace bottom sealing steel shell and the support columns to form a truss-like integral ring column structure. S4. Weld and connect the vertical bars on the upper surface of the protruding reinforced concrete ring beam in S1 and the straightened tension bars on the inner side of the first floor platform of the concrete foundation in S2 to form the steel mesh of the secondary casting ring, and lay the force-transmitting embedded iron on the top slope of the secondary casting ring; S5. Support the formwork and cast the secondary casting ring. Use the connecting plate to connect the furnace bottom sealing steel shell and the supporting column to form a truss-like integral ring column structure. The lower part of the furnace bottom sealing steel shell and the supporting column is buried in the secondary casting ring. The secondary casting ring is integrated with the reinforced concrete ring beam and the first-layer platform of the concrete foundation cast in the first place to complete the construction of the sealed load-bearing structure.

[0018] Furthermore, the upper end of the S1 neutral reinforcement protrudes from the upper surface of the reinforced concrete ring beam by 100 to 250 mm.

[0019] Furthermore, the thickness of the concrete cover of the steel mesh on the inner side of the first platform of the concrete foundation in S2 was reduced to 15-25 mm.

[0020] Furthermore, the spacing of the tie bars in S2 is 200 to 600 mm, and the length of the inner bending section of the tie bars is 80 to 200 mm.

[0021] Compared with the prior art, the present invention has at least the following beneficial effects: (1) The furnace bottom load-bearing beam transmits the forces it receives (mainly the gravity of the furnace charge and the center burner, the impact of the sitting material or the earthquake force) to the upper surface of the reinforced concrete ring beam through the diagonal brace and the force transmission chassis; the furnace wall ring beam transmits the forces it receives (mainly the gravity of the furnace wall refractory material, furnace shell, platform, wind pressure, snow pressure, and earthquake force) to the upper surface of the reinforced concrete ring beam through the support column, the furnace bottom sealing steel shell and the embedded iron, and completes the sealing and consolidation force transmission through the secondary casting ring, thus avoiding fatigue damage to the furnace bottom sealing steel shell; (2) The main function of the first sealing force transmission system is to seal and resist earthquakes and typhoons, and its secondary function is to support and protect the furnace wall and withstand the friction, expansion force and a small amount of impact of the furnace charge when the charge is sitting; the main function of the second sealing force transmission system is to seal and cool the reinforced concrete ring beam of the main load-bearing structure, while the load on the furnace bottom hopper is not large; the main function of the third sealing force transmission system is to seal and discharge the charge evenly and resist a small amount of impact when the charge is sitting, and its secondary function is to withstand the static pressure of the deadweight of the charge column in the furnace; the main function of the fourth sealing force transmission system is to seal and buffer and resist most of the impact when the charge is sitting, and its secondary function is to cooperate with the aforementioned second sealing force transmission system structure to resist earthquakes and typhoons, share and consume the shaking energy of earthquakes and typhoons, and withstand the static pressure of the charge column in the furnace and the reaction force borne by the cooling belt hopper when discharging the charge.

[0022] After adopting the above improvements, the overall strength of the center-burner TGS lime kiln has been greatly improved when using blast furnace gas exclusively: the TGS600 lime kiln built in Vietnam has successfully withstood the instantaneous 17-level strong wind zone of the 15-level typhoon "Rafi". The TGS600 lime kiln body and related facilities were completely undamaged, and the furnace body sealing capacity exceeded 80kPa. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic longitudinal cross-sectional view of the sealing load-bearing structure of the bottom of a lime kiln or other roasting kiln provided by the present invention; Figure 2 This is an enlarged view of the furnace body load-bearing and sealing structure, and the upper and lower hydraulic sealing discharge valves provided by the present invention; Figure 3 This is an enlarged schematic diagram of the installation of the load-bearing diagonal brace provided by the present invention; Figure 4 This is a partially enlarged top view schematic diagram of the installation of the furnace bottom discharge system support structure provided by the present invention. Because the top view is a cross-symmetrical structure about the center of a circle, in order to more clearly show the structural details, a 1 / 4 unit structure is used as an example for explanation; Figure 5 This is a partial enlarged top view of the installation of the furnace bottom load-bearing structure provided by the present invention. Since the top view is a cross-symmetrical structure about the center of a circle, in order to more clearly show the structural details, a 1 / 4 unit structure is used as an example for explanation; Figure 6 This is an enlarged schematic diagram of the installation of the furnace bottom push plate discharge device provided by the present invention; The following are marked in the figure: 14, lightweight insulation material layer; 15, heavy refractory working layer; 31, large air-cooled composite material center burner; 34, furnace waist steel shell; 35, center burner base; 36, furnace wall ring beam; 37, cooling belt hopper; 38, cross beam; 39, load-bearing diagonal brace; 40, force transmission chassis; 41, discharge material surface; 43, fan-shaped reciprocating push plate and its frame; 44, guide device; 45, guide rail; 46, guide device bracket; 47, roller; 48, roller bracket; 49, power unit; 50, support structure; 51, force transmission embedded iron; 52, auxiliary diagonal brace; 53, concrete foundation layer Platform; 54. Secondary pouring ring; 56. Support column; 57. Furnace bottom sealing steel shell; 58. Sealing ring plate; 59. Reinforcement rib; 60. Connecting plate; 61. Furnace bottom bellows; 62. Annular embedded iron; 63. Reinforced concrete ring beam; 64. Furnace bottom aggregate hopper; 65. Furnace bottom cooling air valve; 66. Furnace bottom cooling air duct; 67. Bunker-type reinforced concrete foundation; 77. Main cooling air inlet valve and duct; 78. Center burner lower exhaust gas valve and duct; 79. Center burner upper exhaust gas valve and duct; 80. Center burner lower exhaust valve and duct; 81. Center burner upper exhaust valve and duct; 82. Herringbone beam. DETAILED DESCRIPTION

[0024] In order to fully understand the purpose, features and effects of the present invention, the present invention is described in detail through the following specific embodiments, but the present invention is not limited thereto.

[0025] like Figures 1 to 6 As shown, the sealing load-bearing structure of the bottom of a lime kiln and other roasting kilns (drying vertical kiln, magnetized roasting kiln, refractory material or clinker roasting kiln, magnesite roasting kiln, etc.) provided by the present invention is divided into four major sealing force transmission systems, namely the first sealing force transmission system, the second sealing force transmission system, the third sealing force transmission system and the fourth sealing force transmission system. The sealing force transmission systems cooperate with each other to disperse and jointly bear the force or shaking energy generated by typhoons, earthquakes, furnace charge sitting, furnace charge self-weight, furnace charge expansion force, refractory materials, steel structures, and the self-weight of various equipment in the furnace body.

[0026] The bunker-type reinforced concrete foundation 67 is located at the bottom of the furnace, buried underground to a certain extent and supported on pile foundations. A reinforced concrete ring beam 63 is continuously cast on its upper part, and all the forces of the entire furnace are concentrated here.

[0027] Reference Figure 2The first sealing force transmission system includes a reinforced concrete ring beam 63, support columns 56, a furnace bottom sealing steel shell 57 and a connecting plate 60. The upper surface of the reinforced concrete ring beam 63 is provided with a force transmission embedded iron 51, and the support columns 56 are fixed on the force transmission embedded iron 51. The outside of the support columns 56 is provided with a furnace bottom sealing steel shell 57, and the lower edge of the furnace bottom sealing steel shell 57 is fixed with a sealing ring plate 58. Several connecting plates 60 connect the furnace bottom sealing steel shell 57 and the support columns 56 at a certain distance to form an integral ring column structure similar to a ring truss with good force bearing. The lower part of the furnace bottom sealing steel shell 57 and the support columns 56 (with anchor nails welded) is fixed in the secondary casting ring 54.

[0028] The steel mesh tie bars of the first-cast concrete foundation platform 53 are straightened and welded together to form the tie bars for the secondary cast ring 54. The inner surface of the concrete foundation platform 53 is then roughened. The steel mesh vertical bars of the secondary cast ring 54 are fixed to the primary cast reinforced concrete ring beam 63. This completes the secondary cast ring 54 into a thick, integral ring structure that blends seamlessly with the roughened upper surface of the primary cast reinforced concrete ring beam 63 and the concrete inside the first-cast concrete foundation platform 53. The upper edge of the integrated load-bearing structure of the furnace bottom sealing steel shell 57 and support columns 56 supports the furnace wall ring beam 36, to which reinforcing ribs 59 are fixed.

[0029] The furnace wall ring beam 36 and support columns 56 are both hollow structures, through which cooling air flows for protection. A cooling belt hopper 37 is suspended from the inside of the furnace wall ring beam 36. The upper side of the furnace wall ring beam 36 secures the furnace waist steel shell 34 and the furnace body steel shell above it. These furnace body steel shells encase the furnace wall, which consists of a lightweight insulation layer 14 and a heavy refractory working layer 15.

[0030] The forces transmitted and resisted by the first sealed force transmission system include: the gravity of all components and materials in the first sealed force transmission system, the friction and expansion force of the charge in the furnace, especially the impact force when the charge is sitting, the horizontal force of the typhoon (the shaking caused by the periodic vortex remaining after the spiral walking ladder is reduced), the horizontal force of earthquake shaking, etc.

[0031] The structural strength of the first sealing and force transmission system, particularly its tensile and flexural strength (which may occur on the windward side during typhoons), is far superior to that of conventional cup-shaped foundation structures. This invention also offers superior sealing performance and longevity compared to the aforementioned prior art, while also simplifying construction and ensuring reliability. The first sealing and force transmission system's primary functions are sealing and resisting earthquakes and typhoons. Its secondary functions are supporting and protecting the furnace wall and withstanding friction, expansion forces, and a small amount of impact from the furnace charge during seating.

[0032] Reference Figure 2The second sealing and force transmission system includes an annular pre-embedded iron 62, a sealing ring plate 58, a furnace bottom hopper 64, and a furnace bottom wind box 61. The cylindrical annular pre-embedded iron 62 and the force transmission pre-embedded iron 51 are pre-embedded inside the reinforced concrete ring beam 63. The sealing ring plate 58 is continuously welded to the upper side of the force transmission pre-embedded iron 51. The furnace bottom hopper 64 is suspended from the lower side of the sealing ring plate 58. The upper portion of the furnace bottom hopper 64 has semicircular air holes. The furnace bottom wind box 61 includes an air blower plate and a conical plate. The air blower plate of the furnace bottom wind box 61 is welded to the inner side of the sealing ring plate 58. The conical plate of the furnace bottom wind box 61 is welded between the lower part of the annular pre-embedded iron 62 and the furnace bottom hopper 64. Ventilation holes are evenly distributed along the upper edge of the furnace bottom hopper 64, and the shape of the vents is preferably semicircular. The conical plate of the furnace bottom wind box 61 is connected to a furnace bottom cooling air duct 66, which is equipped with a furnace bottom cooling air valve 65. This cooling air is supplied to the furnace bottom wind box 61 through the furnace bottom air cooling duct. This cooling air enters the gap between the air blower plate of the furnace bottom wind box 61 and the furnace bottom collection hopper 64 through multiple semicircular air holes evenly distributed at the top of the furnace bottom collection hopper 64. It is then sprayed into the lime discharged into the furnace bottom collection hopper 64, providing final cooling for the product. The ambient temperature cooling air in the furnace bottom wind box 61 cools the reinforced concrete ring beam 63 and surrounding components, preventing the high-temperature product from threatening the non-heat-resistant reinforced concrete ring beam 63 under special furnace conditions, and ensuring that the temperature of the reinforced concrete ring beam 63 is always maintained below 200°C. The main function of the second sealed force transmission system is to seal and cool the reinforced concrete ring beam 63, which is the main load-bearing structure, while the load on the furnace bottom collection hopper 64 is not large.

[0033] Reference Figures 4 to 6 The third sealed force transmission system includes a guide bracket 46, a guide device 44, a roller bracket 48, a roller 47, and a reciprocating push plate. A force transmission embedded iron 51 is fixed to the upper surface of the reinforced concrete ring beam 63. The guide bracket 46 and roller bracket 48 are welded to the embedded iron 51. The upper portion of each bracket is connected to each other by a crossbeam to form a polygonal force-bearing structure and is protected by cooling air. The roller bracket 48 is provided with a roller 47 on the upper surface. The roller 47 is equipped with a rolling reciprocating push plate. The reciprocating push plate is preferably a fan-shaped reciprocating push plate and its frame 43. The outer side of the fan-shaped reciprocating push plate and its frame 43 is connected to a power unit 49. The power unit 49 is sealed and mounted on the furnace bottom sealing steel shell 57. The power unit 49 drives the fan-shaped reciprocating push plate and its frame 43 to reciprocate to complete the discharge. A guide rail 45 is provided on the upper surface of the guide device bracket 46, and a guide device 44 is installed in the guide rail 45. The guide device 44 is in contact with or connected to the fan-shaped reciprocating push plate and its frame 43, and has an auxiliary rolling support effect on the fan-shaped reciprocating push plate and its frame 43. At the same time, it keeps the fan-shaped reciprocating push plate and its frame 43 moving back and forth along a straight line to complete discharging, thereby preventing deviation and damaging the power device 49.

[0034] During operation, the power unit 49 drives the sector-shaped reciprocating push plate and its frame 43 to reciprocate, generating the reaction force during discharge. This force is then transmitted through the power support structure 50 to the pre-embedded force transmission iron 51 on the upper surface of the concrete foundation platform 53, preventing fatigue damage to the furnace bottom sealing steel shell 57. The primary function of the third sealing force transmission system is to seal and uniformly discharge materials and resist a small amount of impact during seating. Its secondary function is to withstand the static pressure of the deadweight of the charge column within the furnace. The internal friction of the bulk charge supported by this system also contributes significantly to dissipating the shaking energy of earthquakes and typhoons.

[0035] Reference Figure 2 and Figure 3 The fourth sealed power transmission system includes a power transmission chassis 40, load-bearing diagonal braces 39, auxiliary diagonal braces 52, a cross beam 38, and a large air-cooled composite central burner 31. A power transmission embedded iron 51 is fixed to the upper surface of the reinforced concrete ring beam 63. The power transmission embedded iron is welded to the power transmission chassis 40. The load-bearing diagonal braces 39, which are protected by cooling air, are welded to the power transmission chassis 40 and reinforced by reinforcing ribs 59. The load-bearing diagonal braces 39 evenly distribute the larger load to the larger area of the reinforced concrete ring beam 63, reducing the compressive strength per unit area. Figure 3 The column with a larger cross-sectional area on the upper part of the load-bearing diagonal brace 39 near the fan-shaped reciprocating push plate and its frame 43 is changed into an upright solid thick steel strip and reinforced with reinforcing ribs 59 to reduce the width and avoid collision with the moving fan-shaped reciprocating push plate and its frame 43. The solid thick steel strip is welded to the axis of the bottom surface of the cross beam 38. The auxiliary diagonal brace 52 is also connected to the bottom surface of the cross beam 38 near the furnace bottom sealing steel shell 57 with this structure. The lower end of the auxiliary diagonal brace 52 is welded to the force transmission embedded iron on the upper surface of the secondary casting ring 54, shortening the force transmission span of the cross beam 38 and improving the load-bearing capacity of the cross beam 38. The outer end of the cross beam 38 passes through the furnace bottom sealing steel shell 57 and is continuously welded and sealed with the furnace bottom sealing steel shell 57. Multiple cross beams 38 are integrated with the central burner base 35 at the intersection in the center of the furnace body to form an integrated load-bearing structure.

[0036] The upper side of the center burner base 35 connects to and supports the large air-cooled composite center burner 31. A herringbone beam 82 is welded to the top plate of the cross beam 38. One of the herringbone beams 82 encloses the center burner's lower gas valve and duct 78, and the center burner's lower exhaust valve and duct 80. The adjacent herringbone beam 82 encloses the center burner's upper gas valve and duct 79, and the center burner's upper exhaust valve and duct 81. The outer end of the herringbone beam 82 passes through the furnace bottom sealing steel shell 57 and is continuously welded to the furnace bottom sealing steel shell 57. The inner end of the herringbone beam 82 is connected to the large air-cooled composite center burner 31. Because the cross beam 38 and herringbone beam 82 are welded to the cooling belt hopper 37 and the furnace bottom sealing steel shell 57, they are a load-bearing structure with a small amount of elastic deformation capacity. The main function of the fourth sealing force transmission system is to seal, cushion and resist most of the impact when the material is placed. The secondary function is to cooperate with the aforementioned first sealing force transmission system structure to resist earthquakes and typhoons, share and consume the shaking energy of earthquakes and typhoons, and withstand the static pressure of the material column in the furnace and the reaction force that the cooling belt hopper 37 withstands when discharging.

[0037] Reference Figure 1 Furthermore, the outer ends of some cross beams 38 are connected to main cooling air inlet valves and ducts 77. Most of the cooling air enters the cross beam 38 through the main cooling air inlet valves and ducts 77. Through the connecting air path, all important components, including the cross beam 38, the herringbone beam 82, the large air-cooled composite material center burner 31, the furnace wall ring beam 36, the support column 56, the load-bearing diagonal brace 39, the auxiliary diagonal brace 52, the guide device bracket 46, and the roller bracket 48, are cooled and protected. The cooling air then passes through the discharge surface 41 between the lower edge of the cooling belt hopper 37 and the fan-shaped reciprocating push plate and its frame 43, and the gaps between the lower edge of the center burner base 35, the lower edge of the cross beam 38, and the fan-shaped reciprocating push plate and its frame 43, before entering the cooling belt column.

[0038] The construction method of the sealed load-bearing structure of the bottom of the lime kiln and other roasting kilns mentioned above comprises the following steps: S1. Cast a bunker-shaped reinforced concrete foundation 67 on an underground pile foundation. Arrange the steel mesh and annular pre-embedded iron 62 for the reinforced concrete ring beam 63 on this foundation and weld them into a single cylindrical shape. The annular pre-embedded iron 62 replaces the formwork. Multiple load-transmitting pre-embedded irons 51 are installed on the upper surface of the reinforced concrete ring beam 63. Deep-buried vertical reinforcement required for the secondary casting ring 54 is laid, with the upper ends of these reinforcements protruding 100 to 250 mm from the upper surface of the reinforced concrete ring beam 63. Formwork is then used to cast the reinforced concrete ring beam 63, and the concrete near the reinforcements is roughened.

[0039] S2. The concrete foundation first-layer platform 53 is cast on the reinforced concrete ring beam 63. The special requirements for the design and construction of this part are that the thickness of the concrete protective layer of the inner steel mesh of the concrete foundation first-layer platform 53 is reduced to 15-25 mm, and a 12 mm tie bar is set every 200-600 mm between the inner and outer steel meshes of the annular reinforced concrete wall in the middle and lower part of the concrete foundation first-layer platform 53. The inner side of the tie bar only needs to be bent into the protective layer. More importantly, the length of the inner bending section of the tie bar must reach 80-200 mm. When the concrete foundation first-layer platform 53 is cast and the formwork is removed, the tie bar on the inner side of the concrete foundation first-layer platform 53 is straightened and the inner surface is roughened.

[0040] S3. Weld multiple support columns 56 to the embedded force transmission iron 51 on the upper surface of the reinforced concrete ring beam 63. Float the furnace bottom sealing steel shell 57 over the support columns 56. A sealing ring plate 58 is welded to the lower edge of the furnace bottom sealing steel shell 57. Concrete anchors are welded to the bottom of the furnace bottom steel shell 57 and the support columns 56. The furnace wall ring beam 36 is installed at the top of the support columns 56. The furnace bottom steel shell 57 is lifted below the furnace wall ring beam 36 and welded to the bottom of the furnace wall ring beam 36. Connecting plates 60 connect the furnace bottom steel shell 57 and the support columns 56 to form a truss-like, integral ring-column structure. Preferably, reinforcing ribs 59 are used to strengthen the support provided by the furnace bottom steel shell 57 and the support columns 56 for the furnace wall ring beam 36. Other components or system equipment within the furnace bottom are also installed interspersed throughout.

[0041] S4. Weld and connect the vertical reinforcement on the upper surface of the protruding reinforced concrete ring beam 63 in S1 and the straightened tension reinforcement on the inner side of the first floor platform 53 of the concrete foundation in S2 to form the steel mesh of the secondary casting ring 54, and lay the force-transmitting embedded iron on the top slope of the secondary casting ring 54.

[0042] S5. Formwork is supported and cast for the secondary pouring ring 54. The lower portion of the truss-like integral ring column structure formed by connecting the furnace bottom sealing steel shell 57 and the support column 56 (both are welded with anchor nails, and the lower edge of the furnace bottom sealing steel shell 57 is welded with a sealing ring plate 58) using a connecting plate 60 is embedded in the secondary pouring ring 54. The secondary pouring ring 54 obtained by the above construction method is well integrated with the reinforced concrete ring beam 63 cast once and the concrete foundation first-layer platform 53. Its structural strength and sealing ability are far stronger than the connection methods of the steel column and the furnace shell with the foundation, such as the ordinary cup-shaped pre-embedded iron foundation or pre-embedded bolt foundation. Combined with the functions of the aforementioned four sealed force transmission system structures to disperse the load and work in coordination, the sealed load-bearing structure of the present invention has successfully withstood the instantaneous strong wind zone of level 17 during a level 15 typhoon.

[0043] Finally, it should be noted that the above-listed embodiments are merely preferred embodiments of the present invention. Of course, those skilled in the art may make changes and modifications to the present invention. If these modifications and variations fall within the scope of the claims of the present invention and their equivalents, they should be considered to be within the scope of protection of the present invention.

Claims

1. A sealing load-bearing structure for the bottom of a lime kiln or other roasting kiln, characterized in that: It includes a bunker-type reinforced concrete foundation, a reinforced concrete ring beam, a first-floor concrete foundation platform, a secondary casting ring, and a sealed force transmission system. A reinforced concrete ring beam is cast on the bunker-type reinforced concrete foundation, and a sealed force transmission system is installed on the reinforced concrete ring beam. The sealed force transmission system is divided into four parts. The first sealed force transmission system includes support columns, furnace bottom sealing steel shell and connecting plates. The support columns are fixed on the upper surface of the reinforced concrete ring beam, and the furnace bottom sealing steel shell is set on the outside of the support columns. The connecting plates connect the furnace bottom sealing steel shell and the support columns to form a truss-like integral ring column structure. The lower parts of the furnace bottom sealing steel shell and the support columns are fixed in the secondary casting ring. The secondary casting ring is located at the intersection of the inner side of the first platform of the concrete foundation and the upper surface of the reinforced concrete ring beam, and is fixedly connected to the two. The second sealed force transmission system includes an annular pre-buried iron, a furnace bottom collecting hopper and a furnace bottom wind box. The annular pre-buried iron and the force transmission pre-buried iron are fixed on the inner side of the reinforced concrete ring beam. The upper side of the force transmission pre-buried iron is connected to the furnace bottom collecting hopper. The furnace bottom collecting hopper is inserted into the furnace bottom wind box. The furnace bottom wind box is connected to the furnace bottom cooling air duct. The third sealing force transmission system includes a guide device, rollers and a reciprocating push plate. The guide device and rollers are connected to the reinforced concrete ring beam. The guide device and rollers are both dynamically connected to the reciprocating push plate to support and guide the reciprocating push plate. The fourth sealed power transmission system includes a power transmission chassis, diagonal braces, load-bearing beams and a large air-cooled composite material central burner. The power transmission chassis is fixed on the reinforced concrete ring beam, the diagonal braces are fixed on the power transmission chassis, the load-bearing beams are fixed on the diagonal braces, and the large air-cooled composite material central burner is fixed in the center of the load-bearing beam.

2. The sealing load-bearing structure for the bottom of a lime kiln or other roasting kiln according to claim 1, characterized in that: The furnace bottom sealing steel shell and the upper part of the support column are connected with the furnace wall ring beam, the cooling belt hopper is hung on the inner side of the furnace wall ring beam, the furnace waist steel shell and the furnace body steel shell are fixed on the upper side of the furnace wall ring beam, and the furnace waist steel shell and the furnace body steel shell are wrapped with a furnace wall consisting of a lightweight insulation material layer and a heavy refractory working layer.

3. The sealing and load-bearing structure for the bottom of a lime kiln and other roasting kilns according to claim 1, characterized in that: It also includes a sealing ring plate, the upper side of the embedded force transmission iron on the inner side of the reinforced concrete ring beam is fixedly connected to the sealing ring plate, and the bottom collecting hopper of the furnace is hung on the lower side of the sealing ring plate; The furnace bottom wind box includes an air spray plate and a conical plate. The inner side of the sealing ring plate is fixedly connected to the air spray plate. The conical plate is fixed between the lower part of the annular embedded iron and the furnace bottom collecting hopper. Ventilation holes are evenly opened on the upper edge of the furnace bottom collecting hopper. The furnace bottom cooling air duct is connected to the conical plate to provide partial cooling air for the furnace bottom wind box.

4. The sealing and load-bearing structure for the bottom of a lime kiln and other roasting kilns according to claim 1, characterized in that: The third sealed force transmission system also includes a guide device bracket and a roller bracket. The guide device bracket and the roller bracket are both fixed on the reinforced concrete ring beam. Each bracket is connected to each other to form a polygonal force structure. A rotatable roller is installed on the roller bracket, and the upper surface of the roller is rollingly connected to the lower surface of the reciprocating push plate; a guide rail is provided on the guide device bracket, and a guide device is installed in the guide rail. The guide device is connected to the reciprocating push plate, so that the reciprocating push plate can reciprocate along the set trajectory.

5. The sealing and load-bearing structure for the bottom of a lime kiln and other roasting kilns according to claim 1, characterized in that: The diagonal braces are divided into load-bearing diagonal braces and auxiliary diagonal braces, and the load-bearing beams are divided into cross beams and herringbone beams. The lower section of the load-bearing diagonal braces is fixedly connected to the force transmission chassis, and the upper section of the load-bearing diagonal braces is fixedly connected to the cross beam; the upper end of the auxiliary diagonal brace is connected to the cross beam, and the lower end of the auxiliary diagonal brace is fixedly connected to the secondary casting ring.

6. The sealing and load-bearing structure for the bottom of a lime kiln or other roasting kiln according to claim 5, characterized in that: The outer ends of the cross beam and the herringbone beam pass through the furnace bottom sealing steel shell and are sealed with the furnace bottom sealing steel shell; the inner end of the herringbone beam is connected to the large air-cooled composite material central burner.

7. The sealing load-bearing structure for the bottom of a lime kiln or other roasting kiln according to any one of claims 1 to 6, characterized in that: The load-bearing beams, large air-cooled composite material central burners, furnace wall ring beams, support columns, load-bearing diagonal braces, and furnace bottom bellows are all hollow structures, and ventilation ducts or vents are connected between them.

8. The method for constructing a sealed load-bearing structure for the bottom of a lime kiln or other roasting kiln according to any one of claims 1 to 7, characterized in that: The steps include: S1. Cast a bunker-type reinforced concrete foundation on the underground pile foundation, lay out the steel mesh and annular embedded iron of the reinforced concrete ring beam on the bunker-type reinforced concrete foundation, and weld them into an integral cylindrical shape; The upper surface of the reinforced concrete ring beam is provided with pre-buried iron for force transmission, the vertical reinforcement required for the secondary casting ring is embedded in the reinforced concrete ring beam, the reinforced concrete ring beam is cast in the formwork, and the concrete near the vertical reinforcement is roughened; S2. Formwork is supported above the reinforced concrete ring beam to cast the first-floor concrete foundation platform. Spaced-apart tie bars are arranged between the inner and outer reinforcement meshes of the annular reinforced concrete wall below the first-floor concrete foundation platform. The inner sides of the tie bars are bent only into the protective layer. When the formwork is removed after casting the first-floor concrete foundation platform, the tie bars on the inner side of the first-floor concrete foundation platform are straightened and the inner side is roughened. S3. Weld support columns to the pre-embedded force-transmitting iron on the upper surface of the reinforced concrete ring beam, suspend the furnace bottom sealing steel shell over the support columns, weld a sealing ring plate to the lower edge of the furnace bottom sealing steel shell, weld concrete anchor nails to the lower parts of the furnace bottom sealing steel shell and the support columns, install the furnace wall ring beam on the top of the support columns, pull up the furnace bottom sealing steel shell, and weld it to the bottom of the furnace wall ring beam. Use connecting plates to connect the furnace bottom sealing steel shell and the support columns to form a truss-like integral ring column structure. S4. Weld and connect the vertical bars on the upper surface of the protruding reinforced concrete ring beam in S1 and the straightened tension bars on the inner side of the first floor platform of the concrete foundation in S2 to form the steel mesh of the secondary casting ring, and lay the force-transmitting embedded iron on the top slope of the secondary casting ring; S5. Support the formwork and cast the secondary casting ring. Use the connecting plate to connect the furnace bottom sealing steel shell and the supporting column to form a truss-like integral ring column structure. The lower part of the furnace bottom sealing steel shell and the supporting column is buried in the secondary casting ring. The secondary casting ring is integrated with the reinforced concrete ring beam and the first-layer platform of the concrete foundation cast in the first place to complete the construction of the sealed load-bearing structure.

9. The construction method of the sealed load-bearing structure of the bottom of a lime kiln or other roasting kiln according to claim 8, characterized in that: The upper end of the S1 neutral reinforcement protrudes 100 to 250 mm from the upper surface of the reinforced concrete ring beam.

10. The construction method of the sealed load-bearing structure of the bottom of a lime kiln and other roasting kilns according to claim 8, characterized in that: The thickness of the concrete cover on the inner side of the steel mesh of the first floor platform of the concrete foundation in S2 is reduced to 15-25 mm; and / or The spacing of the tie bars in S2 is 200 to 600 mm, and the length of the inner bending section of the tie bars is 80 to 200 mm.

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