A two-stage structure of a chain grate preheater

Abstract

The utility model relates to chain and grate machine technical field, specifically disclose a chain and grate machine preheating two section structure, including two section kiln main part, it includes kiln body and connects the air pipe of kiln body top, set up the dispersion spare of kiln body import, it includes dispersion board and sets up a plurality of overflow holes on dispersion board, and dispersion board is far from the side connection a plurality of broken flow cone in the kiln body inner chamber, the spoiler spare, it includes setting up a plurality of fairlead in the kiln body, the utility model discloses through the setting of dispersion spare and spoiler spare, will the big strand disorderly airflow scatter into innumerable strand small, regular airflow, prevents the airflow short circuit, guides its even diffusion to both sides and the middle part, makes the material on the grate bed heat more evenly, the fairlead of swing changes the flow field in the kiln body unceasingly, prevents airflow in some areas to form stagnation or vortex dead angle, ensures the heat to spread throughout the cross section, improves the heat energy utilization.

Description

Technical Field

[0001] This utility model relates to the field of chain grate machine technology, specifically a two-stage preheating structure for a chain grate machine. Background Technology

[0002] As an indispensable high-quality raw material for modern blast furnace ironmaking, the quality of pellets directly affects the blast furnace's operation, energy consumption indicators, and overall quality. Compressive strength is one of the core indicators for evaluating pellet quality. High-strength pellets can effectively reduce pulverization during transport and smelting within the blast furnace, ensuring good permeability and thus reducing the coke ratio and increasing output. Pellet production primarily focuses on acidic pellets, with the preheating stage of the chain grate typically controlled at 940-960℃, resulting in a finished product compressive strength of approximately 2000-2200N. While high preheating temperatures can enhance strength, excessively high temperatures may lead to over-melting of the pellet surface and excessive liquid phase, which can worsen the permeability of the feed layer and even cause "sticking" accidents.

[0003] The two-stage preheating structure of the chain grate machine heats the pellets from the first preheating stage at a higher temperature, causing partial solid-phase reactions and further thoroughly removing residual crystal water and harmful impurities such as sulfur and arsenic from the pellets, resulting in sufficient strength. Existing structures lack an effective primary airflow distribution device, allowing high-temperature airflow from the first stage to directly and in large quantities rush into the second-stage kiln body. This leads to extremely uneven distribution of the airflow velocity and temperature fields across the kiln cross-section, affecting the preheating of the material on the grate. To address these issues, a two-stage preheating structure for the chain grate machine is proposed. Utility Model Content

[0004] The purpose of this invention is to provide a two-stage preheating structure for a chain grate machine to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A two-stage preheating structure for a chain grate machine, comprising:

[0007] The main body of the kiln consists of a kiln body and an exhaust pipe connected to the top of the kiln body.

[0008] A dispersing component installed at the kiln inlet includes a dispersing plate and several overflow holes installed on the dispersing plate, wherein several flow-breaking cones are connected to the side of the dispersing plate away from the kiln cavity.

[0009] A flow-dissipating component includes several guide plates disposed within the kiln body. A central rod, rotatably engaging with the inner wall of the kiln body, is connected to the top of each guide plate. Rotating shafts are connected to the sidewalls at both ends of each guide plate. A movable rod is slidably disposed within the inner wall of the kiln body, and the rotating shafts are rotatably connected to the movable rods.

[0010] The reciprocating adjustment component installed on the kiln body is used to adjust the reciprocating horizontal movement of the moving rod.

[0011] In one alternative: the top of the kiln body cavity is provided with an air extraction chamber, which is connected to an air extraction pipe and is located on top of a guide plate.

[0012] In one alternative: the overflow holes and the flow-breaking cones are arranged in a rectangular array of several.

[0013] In one alternative: the side of the kiln body away from the dispersing plate is connected to a sealing plate.

[0014] In one alternative: the reciprocating adjustment component includes a hydraulic cylinder installed on the top of the kiln body, the piston rod of the power output end of the hydraulic cylinder is connected to a vertical plate, the bottom end of the vertical plate is connected to a pull rod, the sealing plate is provided with a rectangular hole for sliding of the pull rod, and the pull rod extends into the kiln body to connect to a connecting crossbar.

[0015] In one alternative: the movable rod is provided in two sets, and the two sets of movable rods are respectively placed on both sides of the inner wall of the kiln, and the two sets of movable rods are connected by a connecting crossbar at the end near the sealing plate.

[0016] In one alternative: the tip of the flow-breaking cone points in the direction of the incoming flow.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] This invention, through the setting of dispersing and turbulent components, breaks up large, turbulent airflows into countless small, regular airflows, preventing airflow short-circuiting and guiding it to diffuse evenly to both sides and the center, making the material on the grate more evenly heated; the oscillating guide plate continuously changes the flow field inside the kiln, preventing the airflow from forming stagnation or vortex dead zones in certain areas, ensuring that heat is distributed throughout the entire cross section, and improving thermal energy utilization. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model.

[0020] Figure 2 This is a schematic diagram of the reciprocating adjustment component in this utility model.

[0021] Figure 3 This is a schematic diagram of the structure of the turbulence-disrupting component in this utility model.

[0022] In the diagram: 1. Main body of the two-stage kiln; 2. Dispersion component; 3. Turbulence component; 4. Reciprocating adjustment component; 101. Kiln body; 102. Exhaust pipe; 103. Sealing plate; 201. Dispersion plate; 202. Overflow hole; 203. Flow-breaking cone; 301. Guide plate; 302. Center rod; 303. Rotating shaft; 304. Moving rod; 401. Hydraulic cylinder; 402. Vertical plate; 403. Tie rod; 404. Connecting crossbar. Detailed Implementation

[0023] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figures 1-3 In this embodiment, a two-stage preheating structure for a chain grate machine includes...

[0026] The second-stage kiln body 1 includes a kiln body 101 and an exhaust pipe 102 connected to the top of the kiln body 101. It is vertically or inclinedly connected to the top of the kiln body 101, with one end connected to the exhaust chamber inside the kiln body and the other end connected to a negative pressure exhaust system. The exhaust pipe 102 can extract the waste gas inside the kiln body 101 for treatment.

[0027] The dispersing component 2, located at the inlet of the kiln body 101, includes a dispersing plate 201 and several overflow holes 202 on the dispersing plate 201. Several flow-breaking cones 203 are connected to the side of the dispersing plate 201 away from the inner cavity of the kiln body 101. Furthermore, the tip of the flow-breaking cone 203 points towards the incoming flow direction. The hot air discharged from a preheating structure is usually a turbulent airflow that is "large and unstable in direction". When the airflow flows towards the dispersing component 2, it first comes into contact with the flow-breaking cone 203 whose tip points towards the incoming flow direction. The cone-shaped structure can "split and cut" the large airflow, break the turbulent inertia of the airflow, and initially disperse the airflow along the inclined surface of the flow-breaking cone 203 to avoid the airflow concentrating and impacting a certain area.

[0028] The turbulence-disrupting component 3 includes a plurality of guide plates 301 disposed within the kiln body 101. A central rod 302, rotatably engaging with the inner wall of the kiln body 101, is connected to the top of each guide plate 301. Rotating shafts 303 are connected to the side walls at both ends of each guide plate 301. A movable rod 304 is slidably disposed on the inner wall of the kiln body 101, and the rotating shafts 303 are rotatably connected to the movable rods 304.

[0029] The reciprocating adjustment component 4, installed on the kiln body 101, is used to adjust the reciprocating horizontal movement of the moving rod 304.

[0030] Furthermore, the top of the inner cavity of the kiln body 101 is provided with an air extraction chamber, which is connected to the air extraction pipe 102 and is located on the top of the guide plate 301.

[0031] Please see Figure 1 The overflow holes 202 and the flow-breaking cones 203 are arranged in a rectangular array of several. The airflow that has been initially dispersed by the flow-breaking cones will simultaneously pass through the rectangular array of overflow holes 202 on the dispersion plate 201, further sorting the initially dispersed airflow into countless uniform airflows to ensure that the airflow entering the second-stage kiln body 101 is evenly distributed in a planar shape.

[0032] Please see Figure 2 The side of the kiln body 101 away from the dispersion plate 201 is connected to the sealing plate 103; the sealing plate 103 is set to reduce hot gas leakage.

[0033] Please see Figure 2 The reciprocating adjustment component 4 includes a hydraulic cylinder 401 installed on the top of the kiln body 101. The piston rod at the power output end of the hydraulic cylinder 401 is connected to a vertical plate 402. The bottom end of the vertical plate 402 is connected to a pull rod 403. The sealing plate 103 is provided with a rectangular hole for sliding the pull rod 403. The pull rod 403 extends into the kiln body 101 and connects to a connecting crossbar 404.

[0034] When the hydraulic cylinder 401 is working, the adjustable vertical plate 402 moves, thereby driving the connecting horizontal bar 404 to move horizontally via the tie rod 403. This controls the working state of the hydraulic cylinder 401 and allows the adjustable vertical plate 402 to move reciprocally horizontally.

[0035] Please see Figure 3 Two sets of movable rods 304 are provided, and the two sets of movable rods 304 are respectively placed on both sides of the inner wall of the kiln body 101. The two sets of movable rods 304 are connected by a connecting crossbar 404 near the end of the sealing plate 103. The connecting crossbar 404 pulls the movable rods 304 to move horizontally back and forth, which can drive the guide plate 301 to swing around the axis of the central rod 302, so as to avoid the airflow accumulating at the air inlet end of the exhaust pipe 102.

[0036] The working principle of this utility model is as follows: The high-temperature, turbulent, and large-volume hot airflow discharged from a preheating structure first impacts the dispersing component 2. The flow-breaking cone 203 breaks its original flow inertia and guides the airflow to initially disperse along the cone surface, avoiding the concentrated impact of the airflow on a certain area inside the kiln body 101, which could cause local overheating or uneven heating of the material. After the airflow is initially dispersed by the flow-breaking cone, it then passes through the overflow holes 202 arranged in a rectangular array on the dispersing plate 201. After the evenly distributed airflow enters the kiln body, it will encounter the turbulence component 3 driven by the reciprocating regulating component 4. At the same time, the airflow moving up from the bottom grate will also encounter the turbulence component 3. The guide plate 301 swings around the axis of the central rod 302 to prevent the airflow from forming a stable laminar flow inside the kiln body 101. The swinging guide plate 301 continuously changes the flow field inside the kiln body 101, preventing the airflow from forming stagnation or vortex dead zones in certain areas, ensuring that the heat is distributed throughout the entire cross section and improving the thermal energy utilization rate.

[0037] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A two-stage preheating structure for a chain grate machine, characterized in that, include The second kiln body (1) includes a kiln body (101) and an exhaust pipe (102) connected to the top of the kiln body (101). A dispersing component (2) is provided at the inlet of the kiln body (101), which includes a dispersing plate (201) and a plurality of overflow holes (202) provided on the dispersing plate (201). A plurality of flow-breaking cones (203) are connected to the side of the dispersing plate (201) away from the inner cavity of the kiln body (101). A flow-disrupting component (3) includes several guide plates (301) disposed within the kiln body (101). A central rod (302) is connected to the top of each guide plate (301) and rotates in conjunction with the inner wall of the kiln body (101). Rotating shafts (303) are connected to the side walls at both ends of each guide plate (301). A movable rod (304) is slidably disposed on the inner wall of the kiln body (101), and the rotating shafts (303) are rotatably connected to the movable rods (304). The reciprocating adjustment component (4) installed on the kiln body (101) is used to adjust the reciprocating horizontal movement of the moving rod (304).

2. The preheating two-stage structure of a chain grate machine according to claim 1, characterized in that: The top of the inner cavity of the kiln body (101) is provided with an air extraction chamber, which is connected to the air extraction pipe (102) and is located on the top of the guide plate (301).

3. The two-stage preheating structure of a chain grate machine according to claim 1, characterized in that: The overflow hole (202) and the flow-breaking cone (203) are arranged in a rectangular array of several.

4. The two-stage preheating structure of a chain grate machine according to claim 1, characterized in that: The side of the kiln body (101) away from the dispersing plate (201) is connected to the sealing plate (103).

5. The two-stage preheating structure of a chain grate machine according to claim 4, characterized in that: The reciprocating adjustment component (4) includes a hydraulic cylinder (401) installed on the top of the kiln body (101). The piston rod of the power output end of the hydraulic cylinder (401) is connected to a vertical plate (402). The bottom end of the vertical plate (402) is connected to a pull rod (403). The sealing plate (103) is provided with a rectangular hole for sliding the pull rod (403). The pull rod (403) extends into the kiln body (101) and connects to a connecting crossbar (404).

6. The two-stage preheating structure of a chain grate machine according to claim 5, characterized in that: The movable rod (304) is provided in two sets. The two sets of movable rods (304) are respectively placed on both sides of the inner wall of the kiln body (101). The two sets of movable rods (304) are connected by a connecting crossbar (404) at the end near the sealing plate (103).

7. The two-stage preheating structure of a chain grate machine according to claim 1, characterized in that: The tip of the flow-breaking cone (203) points in the direction of the incoming flow.

Images