Multistage waste heat utilization device for recovering secondary zinc oxide in rotary kiln

Abstract

The utility model relates to rotary kiln technical field, concretely relates to multistage waste heat utilization device of rotary kiln recycling secondary oxygen zinc, including heat exchange box, the fixed mounting of heat exchange box's air inlet end has the air inlet pipe, the air inlet pipe is connected to the flue gas export of rotary kiln, the coiled heat exchange pipe for heat exchange operation is provided in heat exchange box, and the one side of heat exchange box is provided with the heat preservation box, and heat exchange box and heat preservation box are linked through the middle pipe and are communicated, and the inside of heat preservation box is provided with the raw material box for storing raw material, and the top of raw material box is provided with feeding spiral feeder, and the bottom of raw material box is provided with discharge spiral feeder, the side edge board body of heat preservation box is fixedly installed with the branch pipe, and the end of branch pipe is fixedly installed with vertical pipe, and the spiral heat exchange pipe for heat exchange is provided in vertical pipe. The utility model has multistage waste heat utilization's effect, improves the overall utilization of waste heat, reduces energy waste.

Description

Technical Field

[0001] This utility model relates to the field of rotary kiln technology, and more specifically, to a multi-stage waste heat recovery device for rotary kilns to recover zinc oxide. Background Technology

[0002] In the production process of recovering zinc oxide in a rotary kiln, a large amount of high-temperature flue gas is generated during the operation of the rotary kiln. If the huge amount of waste heat contained in this flue gas is directly discharged, it will not only cause serious energy waste, but also pollute the environment due to the dust carried by the high-temperature flue gas, increasing the cost of environmental treatment.

[0003] Currently, most rotary kiln zinc recovery production lines only use a single-stage waste heat utilization method, such as generating steam through a waste heat boiler for heating or power generation. However, the waste heat recovery efficiency is low, and only 30% to 40% of the heat in the flue gas can be recovered, with a large amount of waste heat still being lost with the exhaust gas.

[0004] Meanwhile, traditional waste heat recovery devices are not deeply integrated with the recovery process, making it impossible to use waste heat for preheating raw materials or auxiliary drying. This results in additional fuel consumption for heating raw materials, further increasing production energy consumption and hindering the achievement of energy conservation and environmental protection goals. Therefore, we propose a multi-stage waste heat recovery device for rotary kilns to recover secondary zinc oxide. Utility Model Content

[0005] The purpose of this invention is to provide a multi-stage waste heat recovery device for rotary kilns to recover zinc oxide, thereby addressing the deficiencies mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A multi-stage waste heat recovery device for rotary kilns includes a heat exchange box. An air inlet pipe is fixedly installed at the air inlet end of the heat exchange box and connected to the flue gas outlet of the rotary kiln. A serpentine heat exchange tube for heat exchange operation is installed inside the heat exchange box. An insulation box is installed on one side of the heat exchange box, and the heat exchange box and the insulation box are connected by a central pipe. A raw material box for storing raw materials is installed inside the insulation box. A feeding screw feeder is installed at the top of the raw material box, and a discharging screw feeder is installed at the bottom of the raw material box. A secondary pipe is fixedly installed on the side plate of the insulation box, and a vertical pipe is fixedly installed at the end of the secondary pipe. A spiral heat exchange tube for heat exchange is installed inside the vertical pipe.

[0007] Preferably, an induced draft fan is detachably installed at the end of the air inlet pipe, and the induced draft fan is installed at the flue gas outlet of the rotary kiln; This feature allows the flue gas to flow more smoothly into the subsequent heat exchange equipment through the pipeline.

[0008] Preferably, the inlet end of the serpentine heat exchange tube is fixedly installed with an inlet pipe that extends out of the heat exchange box, and the outlet end of the serpentine heat exchange tube is fixedly installed with an outlet pipe that extends out of the heat exchange box. This setting enables normal water inlet and outlet operations.

[0009] Preferably, a cleaning pipe is fixedly installed at the bottom of the heat exchange box, a valve is fixedly installed on the cleaning pipe, and a top cover is detachably installed on the top of the heat exchange box; This setting enables normal cleaning and sewage discharge operations.

[0010] Preferably, a heating chamber is provided between the raw material box and the insulation box, and the central pipe is connected to the heating chamber. The hot air in the heating chamber is used to heat the material in the raw material box.

[0011] Preferably, both the feeding screw feeder and the discharging screw feeder extend out of the insulation box, and the discharge end of the discharging screw feeder is connected to the feed inlet of the rotary kiln. This setting enables the addition of raw materials.

[0012] Preferably, a drain pipe is fixedly installed at the bottom of the insulated box, and a discharge valve is fixedly installed on the drain pipe. The raw material box and the insulated box are fixed together by multiple support rods. This setting allows for sewage discharge operations at the sewage pipe location.

[0013] Preferably, the top of the heat preservation box is detachably fitted with a sealing cover, and a stirring motor is fixedly installed at the center of the top of the sealing cover. A vertically arranged stirring shaft is fixedly installed at the end of the output shaft of the stirring motor, and stirring blades are fixedly installed on the stirring shaft. The stirring blades are located inside the raw material box. This setting enables the material mixing operation to proceed normally.

[0014] Preferably, an air inlet hood is fixedly installed at the air inlet end of the spiral heat exchange tube, and a blower is detachably installed at the end of the air inlet hood. An air outlet pipe is fixedly installed at the air outlet end of the spiral heat exchange tube, and the air outlet pipe is connected to the combustion air inlet of the rotary kiln. This setting allows air to be introduced for heat exchange, and the heat-exchanged air can be supplied to the combustion air inlet of the rotary kiln.

[0015] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model achieves staged heat exchange of high-temperature flue gas from the rotary kiln by setting up a heat exchange box with the air inlet end connected to the flue gas outlet of the rotary kiln, installing serpentine heat exchange tubes inside the heat exchange box, and connecting the heat exchange box to an insulation box with a raw material box through a central pipe. It first recovers part of the waste heat using the serpentine heat exchange tubes, and then introduces the remaining waste heat into the insulation box to heat the raw material box, thus changing the limitations of traditional single-stage recovery and achieving the effect of improving the overall utilization rate of waste heat and reducing energy waste.

[0016] 2. This utility model sets up a raw material box inside the insulation box. The top and bottom of the raw material box are connected to the feeding screw feeder and the discharging screw feeder, respectively. The discharging screw feeder is connected to the rotary kiln inlet. In conjunction with the heating chamber inside the insulation box, the waste heat of the flue gas is used to heat the raw material. This realizes that the waste heat can be directly used for the preheating of the zinc oxide raw material without the need for additional fuel consumption to heat the raw material. This solves the problem of the disconnect between traditional equipment and production process, and achieves the effect of reducing production energy consumption and meeting the requirements of energy conservation and environmental protection.

[0017] 3. This utility model achieves the use of waste heat from the flue gas to heat air by setting a vertical pipe with a spiral heat exchange tube on the side of the insulation box. The air inlet end of the spiral heat exchange tube is connected to a blower, and the air outlet end is connected to the combustion air inlet of the rotary kiln. This allows the use of waste heat from the flue gas to heat air, and the heated air after heat exchange is delivered to the rotary kiln for combustion, further tapping the value of waste heat. At the same time, increasing the temperature of the combustion air can reduce the fuel consumption of the rotary kiln, thereby maximizing the use of waste heat and reducing the overall production energy consumption. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is one of the partial structural schematic diagrams of this utility model; Figure 3 This is the second partial structural schematic diagram of the present utility model; The meanings of the labels in the diagram are as follows: 1. Heat exchanger box; 10. Cleaning pipe; 11. Valve; 12. Top cover; 13. Serpentine heat exchanger tube; 14. Water inlet pipe; 15. Water outlet pipe; 16. Air inlet pipe; 17. Exhaust fan; 18. Central through pipe; 2. Insulation box; 20. Raw material box; 21. Heating chamber; 22. Drain pipe; 23. Discharge valve; 24. Feed screw conveyor; 25. Discharge screw conveyor; 26. Support rod; 27. Sealing cover; 28. Agitator motor; 281. Agitator shaft; 282. Agitator blades; 3. Secondary pipe; 30. Vertical pipe; 31. Spiral heat exchanger tube; 32. Air inlet hood; 33. Blower; 34. Air outlet pipe. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. 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.

[0020] Please see Figures 1-3 This utility model provides a technical solution: a multi-stage waste heat recovery device for rotary kilns, including a heat exchange box 1. An air inlet pipe 16 is fixedly installed at the air inlet end of the heat exchange box 1, and the air inlet pipe 16 is connected to the flue gas outlet of the rotary kiln. A serpentine heat exchange tube 13 for heat exchange operation is installed inside the heat exchange box 1. An induced draft fan 17 is detachably installed at the end of the air inlet pipe 16. The induced draft fan 17 is a high-temperature resistant fan and is installed at the flue gas outlet of the rotary kiln. The serpentine heat exchange tube 13 is fixedly equipped with an inlet pipe 14 that extends out of the heat exchange box 1 at its inlet end, and an outlet pipe 15 that extends out of the heat exchange box 1 at its outlet end. This allows the induced draft fan 17 to smoothly introduce the high-temperature flue gas from the rotary kiln into the heat exchange box 1. The serpentine heat exchange tube 13 can be supplied with cold water through the inlet pipe 14 and output with hot water or steam after heat exchange through the outlet pipe 15, thereby achieving efficient recovery of the primary waste heat of the high-temperature flue gas and avoiding the direct loss of a large amount of waste heat.

[0021] In this embodiment, a heat exchange box 1 is provided with an insulation box 2 on one side. The heat exchange box 1 and the insulation box 2 are connected by a central pipe 18. The insulation box 2 is provided with a raw material box 20 for storing raw materials. A feeding screw feeder 24 is provided on the top of the raw material box 20, and a discharging screw feeder 25 is provided on the bottom of the raw material box 20. A secondary pipe 3 is fixedly installed on the side plate of the insulation box 2. A vertical pipe 30 is fixedly installed at the end of the secondary pipe 3. A spiral heat exchange tube 31 for heat exchange is provided in the vertical pipe 30, so that hot air can be further transported to the raw material box 20 to assist in heating the raw materials inside. At the same time, the hot air that is finally discharged can continue to perform heat exchange operation at the spiral heat exchange tube 31, thereby improving the utilization rate of thermal energy.

[0022] like Figure 1 As shown, a cleaning pipe 10 is fixedly installed at the bottom of the heat exchange box 1, and a valve 11 is fixedly installed on the cleaning pipe 10. A top cover 12 is detachably installed on the top of the heat exchange box 1, so that when needed, the valve 11 can be opened from the cleaning pipe 10 to clean internal impurities.

[0023] like Figure 1 and Figure 2As shown, a heating chamber 21 is provided between the raw material box 20 and the insulation box 2. The central pipe 18 is connected to the heating chamber 21. The hot air in the heating chamber 21 is used to heat the material in the raw material box 20, thereby improving the heat utilization rate of the hot air.

[0024] like Figure 2 As shown, both the feeding screw feeder 24 and the discharging screw feeder 25 extend out of the insulation box 2. The discharge end of the discharging screw feeder 25 is connected to the feed inlet of the rotary kiln, enabling the addition of raw materials. External raw materials can enter the raw material box 20 along the feeding screw feeder 24. The heated raw materials in the raw material box 20 can be transported to the feed inlet of the rotary kiln through the discharging screw feeder 25.

[0025] like Figure 2 As shown, a drain pipe 22 is fixedly installed at the bottom of the insulation box 2, and a discharge valve 23 is fixedly installed on the drain pipe 22 to enable the cleaning of impurities; the raw material box 20 is fixed to the insulation box 2 by multiple support rods 26, which can provide stable support for the raw material box 20.

[0026] It is worth noting that a sealing cover 27 is detachably installed on the top of the heat preservation box 2. A stirring motor 28 is fixedly installed at the center of the top of the sealing cover 27. A vertically arranged stirring shaft 281 is fixedly installed at the end of the output shaft of the stirring motor 28. A stirring blade 282 is fixedly installed on the stirring shaft 281. The stirring blade 282 is located inside the raw material box 20. This setting enables stirring operation, so that the raw materials in the raw material box 20 are heated more fully, and at the same time, it prevents the raw materials from solidifying.

[0027] It is worth noting that an air inlet hood 32 is fixedly installed at the air inlet end of the spiral heat exchange tube 31, and a blower 33 is detachably installed at the end of the air inlet hood 32. An air outlet pipe 34 is fixedly installed at the air outlet end of the spiral heat exchange tube 31. The air outlet pipe 34 is connected to the combustion air inlet of the rotary kiln, which can introduce air for heat exchange operation. The heat-exchanged air can be supplied to the combustion air inlet of the rotary kiln.

[0028] Finally, it should be noted that the components involved in this utility model, such as the induced draft fan 17, stirring motor 28, blower 33, corresponding control system, and external power supply, are all general standard parts or components known to those skilled in the art. Their structures and principles can be obtained by those skilled in the art through technical manuals or conventional experimental methods. In the idle space of this device, all the above-mentioned electrical components, which refer to power elements, electrical components, and adapted controllers and power supplies, are connected by wires. The specific connection methods should refer to the working principle of this utility model. The electrical connections between each electrical component are completed in the order of operation. The detailed connection methods are all technologies known in the art.

[0029] When the multi-stage waste heat recovery device for rotary kiln zinc oxide is in use, the induced draft fan 17 is started to introduce the high-temperature flue gas generated by the rotary kiln into the heat exchange box 1 through the air inlet pipe 16. At the same time, cold water is introduced through the water inlet pipe 14 of the serpentine heat exchange tube 13. After the cold water exchanges heat with the high-temperature flue gas, hot water or steam is output from the water outlet pipe 15 for subsequent use, thus completing the primary waste heat recovery. The cooled flue gas in heat exchange box 1 enters the heating chamber 21 of insulation box 2 through central pipe 18 to heat the zinc oxide raw material in raw material box 20; the feeding screw conveyor 24 is started to feed the raw material into raw material box 20, and at the same time the stirring motor 28 is turned on to drive the stirring shaft 281 and stirring blades 282 to turn the raw material to ensure uniform heating; the heated raw material is transported to the rotary kiln feed port through the discharge screw conveyor 25 to achieve raw material preheating; The flue gas in the insulation box 2 enters the vertical pipe 30 through the auxiliary pipe 3. The blower 33 is started and cold air is introduced into the spiral heat exchange pipe 31 through the air inlet hood 32. After the cold air exchanges heat with the flue gas, it is transported to the combustion air inlet of the rotary kiln through the air outlet pipe 34.

[0030] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A multi-stage waste heat recovery device for rotary kiln, comprising a heat exchange box (1), characterized in that: An air inlet pipe (16) is fixedly installed at the air inlet end of the heat exchange box (1). The air inlet pipe (16) is connected to the flue gas outlet of the rotary kiln. A serpentine heat exchange tube (13) for heat exchange operation is provided inside the heat exchange box (1). A heat insulation box (2) is provided on one side of the heat exchange box (1). The heat exchange box (1) and the heat insulation box (2) are connected by a central pipe (18). A raw material box (20) for storing raw materials is provided inside the heat insulation box (2). A feeding screw feeder (24) is provided on the top of the raw material box (20). A discharging screw feeder (25) is provided on the bottom of the raw material box (20). A secondary pipe (3) is fixedly installed on the side plate of the heat insulation box (2). A vertical pipe (30) is fixedly installed at the end of the secondary pipe (3). A spiral heat exchange tube (31) for heat exchange is provided inside the vertical pipe (30).

2. The multi-stage waste heat recovery device for rotary kiln zinc underoxide as described in claim 1, characterized in that: An induced draft fan (17) is detachably installed at the end of the air inlet pipe (16), and the induced draft fan (17) is installed at the flue gas outlet of the rotary kiln.

3. The multi-stage waste heat recovery device for rotary kiln zinc underoxide as described in claim 1, characterized in that: The inlet end of the serpentine heat exchange tube (13) is fixedly installed with an inlet pipe (14) that extends out of the heat exchange box (1), and the outlet end of the serpentine heat exchange tube (13) is fixedly installed with an outlet pipe (15) that extends out of the heat exchange box (1).

4. The multi-stage waste heat recovery device for rotary kiln zinc underoxide as described in claim 1, characterized in that: A cleaning pipe (10) is fixedly installed at the bottom of the heat exchange box (1), and a valve (11) is fixedly installed on the cleaning pipe (10). A top cover (12) is detachably installed on the top of the heat exchange box (1).

5. The multi-stage waste heat recovery device for rotary kiln zinc underoxide as described in claim 1, characterized in that: A heating chamber (21) is provided between the raw material box (20) and the insulation box (2). The central pipe (18) is connected to the heating chamber (21). The hot air in the heating chamber (21) is used to heat the material in the raw material box (20).

6. The multi-stage waste heat recovery device for rotary kiln zinc underoxide as described in claim 1, characterized in that: Both the feeding screw feeder (24) and the discharging screw feeder (25) extend out of the insulation box (2), and the discharge end of the discharging screw feeder (25) is connected to the feed inlet of the rotary kiln.

7. The multi-stage waste heat recovery device for rotary kiln zinc underoxide as described in claim 1, characterized in that: A drain pipe (22) is fixedly installed at the bottom of the insulated box (2), and a discharge valve (23) is fixedly installed on the drain pipe (22). The raw material box (20) and the insulated box (2) are fixed together by multiple support rods (26).

8. The multi-stage waste heat recovery device for rotary kiln zinc underoxide as described in claim 1, characterized in that: The top of the heat preservation box (2) is detachably fitted with a sealing cover (27). A stirring motor (28) is fixedly installed at the center of the top of the sealing cover (27). A stirring shaft (281) is fixedly installed at the end of the output shaft of the stirring motor (28). A stirring blade (282) is fixedly installed on the stirring shaft (281). The stirring blade (282) is located inside the raw material box (20).

9. The multi-stage waste heat recovery device for rotary kiln zinc oxide recovery according to claim 1, characterized in that: An air inlet hood (32) is fixedly installed at the air inlet end of the spiral heat exchange tube (31), and a blower (33) is detachably installed at the end of the air inlet hood (32). An air outlet pipe (34) is fixedly installed at the air outlet end of the spiral heat exchange tube (31), and the air outlet pipe (34) is connected to the combustion air inlet of the rotary kiln.

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