Feeding device of grate cooler

Abstract

The utility model discloses a feeding device of a grate cooler. The feeding device comprises a fixed frame, a feeding grate plate, a baffle, a cooling air inlet pipeline, an air distribution valve and a manual regulating valve, the feeding grid plates are installed on the upper side face of the fixed frame in a step shape, each feeding grid plate and the upper side face of the fixed frame define an air inlet distribution cavity, each air inlet distribution cavity is communicated with the air inlet cavity through an air distribution valve, and each step face of each feeding grid plate is provided with an air outlet hole; the baffles are installed on the two sides of the feeding grid plate, and a feeding channel from narrow to wide is formed between the two baffles. The air inlet cavity of the fixing frame is divided into a plurality of cooling areas through partition plates, each cooling area is provided with a cooling air inlet pipeline, and the cooling air inlet pipelines are communicated with the cooling areas through air inlet branch pipes. The material heat exchange time can be prolonged to the maximum degree, the material heat recovery efficiency is improved, a material layer is stabilized, and the phenomena of material accumulation and the like are prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of grate coolers, and particularly relates to a feeding device for a grate cooler. Background Art

[0002] A grate cooler is an important main equipment in the clinker burning system of a cement plant. Its main functions are to cool and convey the cement clinker out of the kiln; at the same time, it provides hot air for the rotary kiln and decomposition furnace, etc., and is the main equipment for heat recovery in the burning system.

[0003] In the burning system, due to problems with raw material ratio and operation level, the phenomenon of uneven particle size of the material out of the kiln often occurs. This will cause the material to be thrown at a certain angle along the rotation direction of the kiln towards the feeding port of the grate cooler under the action of weight and inertial centrifugal force. Due to the weight difference between the thick and thin materials, segregation of the material will occur at the feeding port of the grate cooler, resulting in uneven distribution of the material in the grate cooler. The high-temperature section of the material cannot be cooled in time, and the thin-layer material is prone to air short-circuit, greatly affecting the heat recovery efficiency of the material. Summary of the Utility Model

[0004] To solve the above problems, the utility model provides a feeding device for a grate cooler.

[0005] The technical scheme adopted by the utility model is as follows:

[0006] A feeding device for a grate cooler includes a fixed frame, a feeding grate plate, baffles, a cooling air inlet pipe, an air distribution valve, and a manual regulating valve; the fixed frame has a closed air inlet cavity and an upper side surface inclined from the feeding end to the discharging end. The feeding grate plates are installed stepwise on the upper side surface of the fixed frame. Each feeding grate plate and the upper side surface of the fixed frame enclose an air inlet distribution cavity. Each air inlet distribution cavity is connected to the air inlet cavity through an air distribution valve. The air distribution valve is used to automatically adjust the flow rate of the air inlet distribution cavity according to the change of material resistance; the upper side surface of the feeding grate plate is set as a stepped surface, and each stepped surface is provided with an air outlet hole, and the air outlet hole is connected to the air inlet distribution cavity; the baffles are installed on both sides of the feeding grate plate, and a feeding channel that becomes wider from narrow is formed between the two baffles; the air inlet cavity of the fixed frame is divided into several cooling zones by partition plates, and each cooling zone is configured with a cooling air inlet pipe. The cooling air inlet pipe is connected to each cooling zone through an air inlet branch pipe, and a manual regulating valve is installed on the air inlet branch pipe.

[0007] By setting baffles and stepped feeding grate plates, the materials entering the grate cooler can be evenly laid on the feeding grate plates with a certain thickness, solving the problem of air short - circuit in thin - layer materials. Additionally, by setting cooling air inlet pipes and air distribution valves, the air distribution valves can automatically adjust the air volume flow rate entering the air inlet distribution chamber according to the change of material pressure, thereby adjusting the distribution of cold air on the feeding grate plates, achieving the best effect of uniform distribution of cooling air on the material layer, improving the heat recovery efficiency of the materials, and saving production energy consumption.

[0008] Furthermore, each cooling zone is equipped with an air cannon and an integrated pipeline. One end of the integrated pipeline is connected to the air cannon, and the other end is respectively communicated with the air inlet distribution chambers of the feeding grate plates in each cooling zone through branch pipes.

[0009] The air cannon is equipped with an air cannon controller, which is used to control the action interval of the air cannon. That is, when the gas in the air cannon reaches saturation, the air in the air cannon is automatically transported to the integrated pipeline, converting the air pressure energy into air jet kinetic energy, generating a strong impact force, blowing through the materials piled on the feeding grate plates, and preventing the air outlet holes of the feeding grate plates from being blocked by materials.

[0010] Furthermore, check valves are provided on the branch pipes of the integrated pipeline to prevent the reverse flow of cooling air.

[0011] Furthermore, the air distribution valve has two air outlets. The first air outlet is open - type, and a spring piece is provided in the second air outlet. The spring piece is used to change the opening degree of the second air outlet with the change of material resistance to control the flow rate.

[0012] The first air outlet being open - type can ensure that there is always cooling air on the feeding grate plates. A spring piece is arranged in the second air outlet. When the material layer on the feeding grate plates is thicker, the air pressure at the outlet of the air distribution valve becomes larger, the air volume flowing through the second air outlet becomes smaller, and the two - side spring pieces open, and the opening degree of the second air outlet becomes larger, so that the air volume of the second air outlet increases and the air pressure increases accordingly. When the material layer on the feeding grate plates is thinner, the air pressure at the outlet of the air distribution valve becomes smaller, the air volume flowing through the second air outlet becomes larger, and the two - side spring pieces close, and the opening degree of the second air outlet becomes smaller, so that the air volume of the second air outlet decreases and the air pressure decreases accordingly. Therefore, the air volume of the second air outlet can be automatically adjusted through the spring piece, thereby automatically adjusting the uniform distribution of cold air on the materials.

[0013] Furthermore, a resistance bolt is also provided in the second air outlet, and the resistance bolt is used to limit the maximum opening angle of the spring piece to avoid the phenomenon of full closure.

[0014] Furthermore, a pressure - measuring device is also installed on the air inlet branch pipe of the cooling air inlet pipe. Through the pressure - measuring device, the uniform distribution of the cooling air entering the air inlet chamber is preliminarily adjusted.

[0015] Further, the included angle α between the upper side surface of the fixed frame and the horizontal direction is 10 - 12°. If the angle is less than 10°, material jamming is likely to occur, that is, the material cannot pass through the feeding grate smoothly and accumulates at the inlet of the grate cooler. If the angle is greater than 12°, the residence time of the material on the feeding grate becomes shorter, which is not conducive to the cooling of the material and affects the heat recovery efficiency.

[0016] Further, the air outlet direction of the air outlet holes of the feeding grate is the same as the material flow direction. The air outlet can form a powerful high-speed horizontal jet airflow, which advances along the surface of the grate and horizontally enters the cooling air of the clinker, and has a longer path in the clinker, improving the heat exchange effect of the material.

[0017] Further, the feeding grate is provided with three horizontal step surfaces. The air outlet holes of the first step surface and the third step surface are opened at the lowermost end of the step surface, and the air outlet holes of the third step surface are arranged at the end face of the feeding grate. The residence time of the material on the feeding grate is prolonged, and the heat recovery effect of the material is improved.

[0018] Further, the cross-section of the air outlet hole is a flat rectangle. It is conducive to the uniform distribution of the cooling air on the feeding grate. Description of the Drawings

[0019] Figure 1 is an axonometric view of the feeding device of the grate cooler of the present invention.

[0020] Figure 2 is Figure 1 a sectional view of

[0021] Figure 3 is a structural diagram of the air distribution valve of the present invention.

[0022] Figure 4 is a structural diagram of the feeding grate of the present invention.

[0023] Figure 5 is a structural diagram of the integrated pipeline of the present invention.

[0024] Figure 6 is a structural diagram of the cooling air inlet pipeline of the present invention.

[0025] In the figure, 1. Cooling air inlet pipeline; 2. Pressure measuring device; 3. Manual regulating valve; 4. Fixed frame; 5. Air cannon; 6. Integrated pipeline; 7. Lining baffle; 8. Feeding grate; 9. Air distribution valve. Detailed Embodiments

[0026] To make the objectives, technical solutions, and advantages of the present utility model clearer, the technical solutions of the present utility model will be clearly and completely described below in conjunction with the drawings and a preferred embodiment.

[0027] Refer to Figures 1-6, this embodiment provides a grate cooler feeding device, which includes a cooling air inlet pipe 1, a pressure measuring device 2, a manual regulating valve 3, a fixed frame 4, an air cannon 5, an integrated pipe 6, a baffle 7, a feeding grate plate 8 and an air distribution valve 9.

[0028] The fixed frame 4 includes a closed air inlet cavity enclosed by a bottom plate, an upper side plate, and four side plates on the front, rear, left, and right. The angle α between the upper side plate and the horizontal bottom plate is 10 - 12°, and specifically in implementation, the angle α is selected according to the self-unloading angle of the material characteristics. The air inlet cavity is divided into several cooling zones according to the output from the kiln. For example, in this embodiment, it is divided into 3 cooling zones by two partition plates 10. The upper side plate is provided with cooling air outlets of the same size, and an air distribution valve 9 is installed in the cooling air outlets.

[0029] The air distribution valve 9 is provided with two air outlets. The first air outlet 91 is an open type, and on the opposite side surfaces in the second air outlet 92, two groups of spring pieces are symmetrically arranged. Each group of spring pieces includes spring piece A9-1 and spring piece B9-2 stacked together. Spring piece A9-1 and spring piece B9-2 are different in size and thickness. The upper ends of spring piece A9-1 and spring piece B9-2 are fixed on the side wall of the air outlet, and the lower ends extend downward along the length direction of the air outlet out of the second air outlet 92. A resistance bolt 9-3 is arranged on the other side surface of the second air outlet 92. When the air volume flowing through the second air outlet 92 is large, the lower ends of spring piece A9-1 and spring piece B9-2 open towards the center of the air outlet, and the ventilation cross-section of the second air outlet becomes smaller; the resistance bolt 9-3 is used to limit the maximum opening angle. When the air volume flowing through the second air outlet 92 is small, the opening angle of spring piece A9-1 and spring piece B9-2 becomes smaller, and the ventilation cross-section of the second air outlet becomes larger. In this embodiment, the inlet air resistance of the air distribution valve 9 can be automatically adjusted within the range of 0 - 400 mmH2O.

[0030] Above each air distribution valve 9, a feeding grate plate 8 is installed. The feeding grate plate 8 is installed in a stepped shape on the upper side surface of the fixed frame 4. Each feeding grate plate 8 and the upper side surface of the fixed frame 4 enclose an air inlet distribution cavity, and the air inlet distribution cavity is communicated with the two air outlets of the air distribution valve 9.

[0031] The feeding grate plate 8 is integrally cast with heat-resistant and wear-resistant materials. In this embodiment, the feeding grate plate 8 is provided with three horizontal stepped surfaces. Each stepped surface is provided with a row of air outlet holes 8-1 that are connected to the air inlet distribution cavity and have uniform sizes. The air outlet holes 8-1 on the first stepped surface and the second stepped surface are opened at the lowermost end of the stepped surface, that is, the second stepped surface serves as the bottom surface of the air outlet holes on the first stepped surface, and the third stepped surface serves as the bottom surface of the air outlet holes on the second stepped surface. The air outlet holes on the third stepped surface are arranged at the end surface of the feeding grate plate 8, and their elevation is higher than the feeding grate plate 8 of the next lower step.

[0032] There are two baffle plates 7, symmetrically installed on both sides of the feeding grate plate 8. The baffle plates 7 are welded by high-temperature resistant steel plates, presenting a flat trapezoid shape with a wider upper part and a narrower lower part. A feeding channel that becomes wider from narrow is formed between the two baffle plates 7. The main function of the baffle plates 7 is to isolate them from the cooling air, and it is also used to shape the feeding port of the grate cooler to form a special horseshoe-shaped opening, that is, a feeding channel that becomes wider from narrow, so as to evenly distribute the materials and form a stable material layer.

[0033] Each cooling zone of the fixed frame 4 is equipped with a cooling air inlet pipe 1. The cooling air inlet pipe 1 is welded by steel plates, one end is blocked by a steel plate, and the other end is set as an air inlet. A number of air inlet branch pipes are arranged on the cooling air inlet pipe 1. The air inlet branch pipes are communicated with the grate plate cooling zones, and a manual regulating valve 3 and a pressure measuring device 2 are installed on the air inlet branch pipes. Through the pressure measuring device 2 and the manual regulating valve 3, the manual regulating valve can be controlled according to the pressure parameters to monitor the material layer height of the materials in this area and whether there are problems such as short-circuit of the cooling air.

[0034] Each cooling zone of the fixed frame 4 is equipped with at least one air cannon 5 and an integrated pipe 6. In this embodiment, each cooling zone is equipped with a set of air cannons 5 and a root integrated pipe 6. The integrated pipe 6 is welded and fixed on the fixed frame 4. One end of the integrated pipe 6 is connected to the air cannon 5. A number of branch pipes are arranged on the integrated pipe 6, and each branch pipe is communicated with the air distribution cavity of a feeding grate plate 8. A one-way valve 6-1 is installed on each branch pipe.

[0035] The working principle of the present invention is: The fixed frame 4 is fixed by welding below the material falling area of the kiln. The inside of the fixed frame 4 is divided into multiple cooling zones according to the material characteristics and production capacity of the rotary kiln. Each cooling zone is equipped with a flange cooling air inlet, and a separate cooling air inlet pipe 1 is equipped at the air inlet. In actual production, the manual regulating valve 3 can be controlled according to the pressure parameters on the cooling air inlet pipe 1 and the material layer height. The feeding grate plates 8 are installed on the fixed frame 4 in a stepped and reduced-opening (horseshoe-shaped) manner. Air distribution valves 9 are equipped inside the feeding grate plates 8 to control the pressure difference change of the materials on the feeding grate plates 8 in each cooling zone. There is an integrated pipe 6 under the feeding grate plate 8. One-way valves 6-1 are equipped on the branch pipes of the integrated pipe 6 to prevent the reverse flow of materials and cooling air, and it can also prevent the blockage of the grate gaps by materials and the accumulation of materials on the grate plates, resulting in the "snowman" phenomenon.

[0036] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present utility model, several improvements and refinements can still be made, and these improvements and refinements are also within the protection scope of the present utility model.

Claims

1. A grate cooler feeding device, characterized in that: It comprises a fixed frame (4), a feed grate plate (8), a baffle (7), a cooling air inlet duct (1), an air distribution valve (9) and a manual regulating valve (3); The fixed frame (4) has a closed air inlet cavity and an upper side surface inclined from the feed end to the discharge end. The feed grate plate (8) is mounted in a stepped manner on the upper side surface of the fixed frame (4). Each feed grate plate (8) and the upper side surface of the fixed frame (4) enclose an air inlet distribution cavity. Each air inlet distribution cavity is connected to the air inlet cavity through an air distribution valve (9). The air distribution valve (9) is used to automatically adjust the flow rate of the air inlet distribution cavity according to the change of material resistance. The upper side surface of the feed grate plate (8) is arranged as a step surface. Each step surface is provided with an air outlet hole (8-1). The air outlet hole is connected to the air inlet distribution cavity. The baffle plate (7) is mounted on both sides of the feed grate plate (8). A feed channel from narrow to wide is formed between the two baffle plates (7). The air inlet cavity of the fixed frame (4) is divided into a plurality of cooling zones by a partition (10), each cooling zone is provided with a cooling air inlet duct (1), the cooling air inlet duct (1) is connected with each cooling zone through an air inlet branch pipe, and a manual regulating valve (3) is installed on the air inlet branch pipe.

2. A grate cooler feeding device according to claim 1, characterized in that: Each cooling zone is equipped with an air cannon (5) and an integrated pipe (6). One end of the integrated pipe (6) is connected to the air cannon (5), and the other end is connected to the air inlet distribution cavity of the feed grate plate (8) of each cooling zone through a branch pipe.

3. A grate cooler feeding device according to claim 2, characterized in that: A one-way valve (6-1) is provided on the branch pipe of the integrated pipeline (6).

4. A grate cooler feeding device according to claim 1 or 2, characterized in that: The air distribution valve (9) is provided with two air outlets, the first air outlet is open, and a spring sheet (9-1) is provided in the second air outlet. The spring sheet is used to change the opening of the second air outlet as the material resistance changes, thereby controlling the flow rate.

5. A grate cooler feeding device according to claim 4, characterized in that: A resistance bolt (9-3) is also provided in the second air outlet, and is used to limit the opening angle of the spring sheet (9-1) to avoid a full closing phenomenon.

6. A grate cooler feeding device according to claim 1, characterized in that: A pressure measuring device (2) is also installed on the air inlet branch pipe of the cooling air inlet duct (1).

7. A grate cooler feeding device according to claim 1, characterized in that: The angle α between the upper side surface of the fixed frame (4) and the horizontal direction is 10-12°.

8. A grate cooler feeding device according to claim 1, characterized in that: The air outlet direction of the air outlet hole (8-1) of the feed grate plate (8) is consistent with the material flow direction.

9. A grate cooler feeding device according to claim 8, characterized in that: The feed grate plate (8) is provided with three horizontal step surfaces, the air outlet holes of the first step surface and the third step surface are opened at the lowest ends of the step surfaces, and the air outlet holes of the third step surface are arranged on the end surface of the feed grate plate (8).

10. A grate cooler feeding device according to claim 9, characterized in that: The cross section of the air outlet (8-1) is a flat rectangle.

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