Boiling bed secondary oxidation heat recovery device

Abstract

A boiling bed secondary oxidation heat recovery device comprises an ash box arranged at the discharging end of a rotary kiln and is characterized in that a material receiving bin is arranged at an outlet in the bottom of the ash box, a plurality of air inlet caps are arranged at the bottom of the material receiving bin in a rectangular array mode, a gap between every two adjacent air inlet caps is filled with particle filler, and an air inlet hopper is connected to the lower portion of the material receiving bin; the air inlet cap is communicated with the air inlet hopper; openings are symmetrically formed in the two ends of the material receiving bin, push-pull rakes are inserted into the openings, and the outer ends of the push-pull rakes are connected with a driving device. Blanking hoppers are arranged on the two sides of the material receiving bin, the blanking hoppers are U-shaped, and blanking channels on the two sides of the blanking hoppers are communicated with openings in the two ends of the material receiving bin respectively and used for receiving roasting clinker pushed out by reciprocating motion of the push-pull rake; double-layer discharging valves are arranged in the discharging channels on the two sides of the discharging hopper respectively; a discharge hole is formed in the lower end of the blanking hopper. The device is high in cooling speed and heat exchange efficiency, hot air after heat exchange directly enters the kiln without being conveyed through a pipeline to support combustion and enrich oxygen, the oxygen roasting quality can be improved, and heat energy is saved.

Description

Technical Field

[0001] The utility model belongs to a heat recovery device, in particular to a fluidized bed secondary oxidation heat recovery device. Background Art

[0002] In the non-ferrous metallurgy and ferroalloy industries, rotary kilns are often used for oxidation roasting of some materials. The roasted clinker produced requires good oxidation quality and high thermal energy utilization in the roasting system. The thermal energy utilization of the rotary kiln as a heat processing equipment is that the heat loss of roasted clinker is 40% of the total heat supply, the heat loss of the cylinder is 20% of the total heat supply, and the heat loss of roasting flue gas is 40% of the total heat supply.

[0003] In order to facilitate the normal production of the subsequent processing procedures, the rotary kiln roasted clinker needs to be cooled, and secondary oxidation and heat exchange will occur during the cooling process. Traditional cooling equipment mainly includes single-drum coolers with internal and external cooling; its cooling effect is not good, the heat taken away by the clinker cannot be effectively recycled, and the secondary oxidation effect is not good either. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a fluidized bed secondary oxidation heat recovery device with fast cooling speed and high heat exchange efficiency.

[0005] In order to solve the above problems, the utility model adopts the following technical solutions:

[0006] A fluidized bed secondary oxidation heat recovery device comprises an ash box arranged at the discharge end of a rotary kiln, and its special features are: a receiving bin is arranged at the outlet of the bottom of the ash box, a plurality of air inlet caps are arranged in a rectangular array at the bottom of the receiving bin, and the gaps between adjacent air inlet caps are filled with granular fillers, and an air inlet hopper is connected below the receiving bin for introducing cooling air from an external fan; the air inlet cap is connected to the air inlet hopper;

[0007] Openings are symmetrically arranged at both ends of the receiving bin and a push-pull rake is inserted therein, and a driving device is connected to the outer end of the push-pull rake to drive the push-pull rake to reciprocate;

[0008] A discharge hopper is provided on both sides of the receiving bin. The discharge hopper is U-shaped and the discharge channels on both sides are respectively connected with the openings at both ends of the receiving bin, so as to receive the roasted clinker pushed out by the reciprocating motion of the push-pull rake; double-layer discharge valves are respectively provided in the discharge channels on both sides of the discharge hopper, so as to seal the receiving bin during unloading; a discharge port is provided at the lower end of the discharge hopper, so as to discharge the cooled roasted clinker.

[0009] As a further preference, the push-pull rake is composed of three evenly distributed push plates and a plurality of connecting rods connecting the three push plates, and one end of the middle connecting rod passes through one side of the lower hopper and is coaxially connected to the output end of the driving device.

[0010] As a further preference, the driving device is a driving cylinder and is fixed to one side of the lower hopper through a bracket.

[0011] As a further preference, a rubber sealing pad is fixed on one side of the discharge hopper at a position corresponding to the middle connecting rod, and the rubber sealing pad is sleeved on the corresponding connecting rod to seal the discharge channel.

[0012] As a further preference, the air inlet cap is in the shape of a hollow shaft with a closed upper end. The upper end of the air inlet cap is a large head end and is evenly distributed with inclined jet holes along the circumferential direction. Each jet hole is inclined downward and connected to the center hole of the air inlet cap, so as to guide the cooling air into the receiving bin.

[0013] As further preferred, the particle filler is roasted clinker.

[0014] The beneficial effects of the utility model are:

[0015] 1. The structure is simple. The device is connected with the ash box at the discharge end of the rotary kiln to realize automatic discharge. A fluidized bed is formed by a number of air inlet caps at the bottom of the receiving bin and granular fillers filled between adjacent air inlet caps. After the cooling air is introduced into the fluidized bed through the air inlet caps, it is in full contact with the falling roasted clinker and is in a bubbling and boiling state, with high heat exchange efficiency. The clinker cools quickly, and the hot air after heat exchange is directly transported into the kiln without pipelines to assist combustion and enrich oxygen, which can improve the quality of oxygen roasting and save thermal energy.

[0016] 2. After the cooling air is introduced into the formed fluidized bed, the roasted clinker can be secondary oxidized, which can improve the oxidation degree of the clinker and is beneficial to metallurgy. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model.

[0018] Figure 2 yes Figure 1 AA section view.

[0019] Figure 3 yes Figure 1 A partial enlarged view of .

[0020] Figure 4 It is a structural cross-sectional view of the air inlet cap.

[0021] In the figure: rotary kiln 1, ash box 2, push-pull rake 3, granular filler 4, air inlet hopper 5, lower hopper 6, fan 7, air inlet cap 8, material receiving bin 9, double-layer discharge valve 10, rubber sealing pad 11, drive device 12, slideway 13. DETAILED DESCRIPTION

[0022] like Figure 1 to Figure 4As shown, the utility model relates to a fluidized bed secondary oxidation heat recovery device, including an ash box 2 arranged at the discharge end of a rotary kiln 1, and a receiving bin 9 is connected at the outlet at the bottom of the ash box 2 through a rectangular flange and bolts. The receiving bin 9 is a rectangular box-shaped body with an open upper end, and a plurality of air inlet caps 8 are installed in a rectangular array on the bottom plate of the receiving bin 9, and a granular filling material 4 is filled in the gap between adjacent air inlet caps 8. The granular filling material 4 is roasted clinker and the height of the granular filling material 4 is less than or equal to the height of the air inlet cap 8.

[0023] An air inlet scoop 5 is connected below the receiving bin 9 through a rectangular flange and bolts. The upper end of the air inlet scoop 5 is rectangular and the lower end is circular, and is used for an external fan 7 to introduce cooling air.

[0024] The air inlet cap 8 is in the shape of a hollow shaft with a closed upper end and the lower end is fixed to the base plate by a nut. The upper end of the air inlet cap 8 is a large head end and is evenly distributed with inclined jet holes 801 along the circumferential direction. Each jet hole is inclined downward and connected to the center hole 802 of the air inlet cap 8. The lower end of the center hole of the air inlet cap 8 is connected to the air inlet hopper 5, which is used to guide the cooling air into the receiving bin 9.

[0025] Rectangular openings 901 are symmetrically provided at both ends of the receiving bin 9, and a push-pull rake 3 is inserted through clearance fit. A driving device 12 is connected to the outer end of the push-pull rake 3 to push the push-pull rake 3 to reciprocate. Slideways 13 are symmetrically provided on the front and rear sides of the inner wall of the receiving bin 9 to support the push-pull rake 3 to reciprocate.

[0026] The push-pull rake 3 is composed of three evenly distributed push plates and multiple connecting rods connecting the three push plates. One end of the connecting rod in the middle passes through one side of the lower hopper 6 and is coaxially connected to the output end of the driving device 12. The driving device 12 is a driving cylinder and is fixed to one side of the lower hopper 6 through a bracket. A rubber sealing pad 11 is fixed to the position of the middle connecting rod on one side of the lower hopper 6. The rubber sealing pad 11 is sleeved on the corresponding connecting rod to seal the lowering channel.

[0027] The lower hopper 6 is fixed on both sides of the receiving bin 9 and connected to the bottom of the ash box 2 through rectangular flanges and bolts. The lower hopper 6 is U-shaped and the lowering channels 601 on both sides are respectively connected to the openings at both ends of the receiving bin 9, so as to receive the roasted clinker pushed out by the reciprocating motion of the push-pull rake 3; double-layer discharge valves 10 driven by cylinders or motors are respectively installed in the lowering channels 601 on both sides of the lower hopper 6, and the upper and lower valve plates of the double-layer discharge valve 10 are in a vertical state, so as to seal the receiving bin 9 when unloading; a circular discharge port 602 is provided at the lower end of the lower hopper 6 for discharging the cooled roasted clinker.

[0028] When working, start the fan 7 connected to the lower end of the air inlet hopper 5. When the fan 7 is working, it will introduce cooling air into the air inlet hopper 5 and introduce it into the receiving bin 9 through the jet holes of several air inlet caps 8. The falling roasted clinker falls on the boiling bed formed by the particle filling material and the air inlet cap 8 at the bottom of the receiving bin 9. After the cooling air is introduced into the boiling bed through the air inlet cap 8, it is in full contact with the falling roasted clinker and is in a bubbling and boiling state, with high heat exchange efficiency. The clinker cools quickly, and the hot air after heat exchange is directly transported into the kiln for combustion and oxygen enrichment without pipeline transportation, which can improve the quality of oxygen roasting and save thermal energy. Start the driving device 12 to drive the push-pull rake 3 to reciprocate, push the cooled roasted clinker into the discharge channel 601 of the lower hopper 6 on both sides, and automatically fall to the discharge port at the lower end of the lower hopper 6 through the rotating double-layer discharge valve, and fall into the receiving pulley below through the discharge port.

[0029] Although the implementation scheme of the utility model has been disclosed as above, it is not limited to the applications listed in the specification and implementation modes. It can be fully applied to various fields suitable for the utility model. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A fluidized bed secondary oxidation heat recovery device, comprising an ash box arranged at the discharge end of a rotary kiln, characterized in that: A receiving bin is provided at the outlet of the bottom of the ash box, a plurality of air inlet caps are provided in a rectangular array at the bottom of the receiving bin, and the gaps between adjacent air inlet caps are filled with granular fillers, and an air inlet hopper is connected below the receiving bin for introducing cooling air from an external fan; the air inlet cap is connected to the air inlet hopper; Openings are symmetrically arranged at both ends of the receiving bin and a push-pull rake is inserted therein, and a driving device is connected to the outer end of the push-pull rake to drive the push-pull rake to reciprocate; A discharge hopper is provided on both sides of the receiving bin. The discharge hopper is U-shaped and the discharge channels on both sides are respectively connected with the openings at both ends of the receiving bin, so as to receive the roasted clinker pushed out by the reciprocating motion of the push-pull rake; double-layer discharge valves are respectively provided in the discharge channels on both sides of the discharge hopper, so as to seal the receiving bin during unloading; a discharge port is provided at the lower end of the discharge hopper, so as to discharge the cooled roasted clinker.

2. The fluidized bed secondary oxidation heat recovery device according to claim 1 is characterized in that: The push-pull rake is composed of three evenly distributed push plates and a plurality of connecting rods connecting the three push plates. One end of the connecting rod in the middle passes through one side of the lower hopper and is coaxially connected to the output end of the driving device.

3. The fluidized bed secondary oxidation heat recovery device according to claim 1 or 2, characterized in that: The driving device is a driving cylinder and is fixed on one side of the lower hopper through a bracket.

4. The fluidized bed secondary oxidation heat recovery device according to claim 2 is characterized in that: A rubber sealing pad is fixed at a position of the middle connecting rod corresponding to one side of the hopper, and the rubber sealing pad is sleeved on the corresponding connecting rod to seal the material discharge channel.

5. The fluidized bed secondary oxidation heat recovery device according to claim 1 is characterized in that: The air inlet cap is in the shape of a hollow shaft with a closed upper end. The upper end of the air inlet cap is a large head end and is evenly distributed with inclined jet holes along the circumferential direction. Each jet hole is inclined downward and connected to the central hole of the air inlet cap to guide cooling air into the receiving bin.

6. The fluidized bed secondary oxidation heat recovery device according to claim 1 is characterized in that: The particle filling material is roasted clinker.

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