Secondary lead smelting flue gas waste heat utilization device

Abstract

The utility model belongs to the technical field of secondary lead production and processing, and discloses a secondary lead smelting flue gas waste heat utilization device which comprises a smelting furnace and a preheating box, a feeding port is formed in the top end of the preheating box, a top cover is arranged at the feeding port, a discharging port is formed in the lower portion of one side of the preheating box, a feeding port is formed in one side of the upper end of the smelting furnace, and a flue gas pipeline is arranged on the other side of the upper end of the smelting furnace. A material guiding pipe is connected between the discharging port and the feeding port, a heat conducting plate which is obliquely arranged is arranged in the preheating box, the lower end of the heat conducting plate is connected with the discharging port, a preheating cavity is formed between the heat conducting plate and the bottom wall of the preheating box, the smoke pipeline is communicated with the preheating cavity, and the side, away from the smoke pipeline, of the preheating cavity is communicated with a smoke discharging pipe. According to the utility model, the waste heat of the flue gas is effectively utilized to preheat the regenerated lead raw material, so that the smelting efficiency can be improved, the heat can be effectively utilized, the energy waste is reduced, the production cost is reduced, and the device is suitable for popularization.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of the production and processing of secondary lead, and particularly relates to a secondary lead smelting flue gas waste heat utilization device. BACKGROUND

[0002] At present, secondary lead has become one of the main sources of lead supply. The raw materials of secondary lead mainly include waste lead storage batteries, cable sheaths, acid-resistant vessel liners, printed alloys, lead-tin solder and bearing alloys, etc. In the production process of secondary lead, the raw materials of secondary lead need to be smelted by using a smelting furnace, and the heat generated in the smelting process will be discharged to the outside along with flue gas, causing a large amount of heat energy waste. Therefore, it is urgent to provide a secondary lead smelting flue gas waste heat utilization device, which utilizes the waste heat of smelting flue gas to preheat the raw materials of secondary lead, so as to improve the smelting efficiency and effectively utilize the heat, reducing energy waste. SUMMARY

[0003] In view of the deficiencies in the background art, the utility model provides a secondary lead smelting flue gas waste heat utilization device, which utilizes the waste heat of smelting flue gas to preheat the raw materials of secondary lead, so as to improve the smelting efficiency and effectively utilize the heat, reducing energy waste.

[0004] To achieve the above-mentioned purpose, the technical solution of the utility model is as follows:

[0005] A secondary lead smelting flue gas waste heat utilization device, characterized in that it comprises a smelting furnace and a preheating box, the top end of the preheating box is provided with a feeding port, the feeding port is provided with a top cover, the lower part of one side of the preheating box is provided with a discharging port, the upper end of one side of the smelting furnace is provided with a feeding port, and the other side is provided with a flue gas pipeline, a guide pipe is connected between the discharging port and the feeding port, a heat-conducting plate is arranged in the preheating box in an inclined manner, the lower end of the heat-conducting plate is connected with the discharging port, a preheating cavity is arranged between the heat-conducting plate and the bottom wall of the preheating box, the flue gas pipeline is communicated with the preheating cavity, and a flue gas discharge pipe is communicated with the side of the preheating cavity away from the flue gas pipeline.

[0006] Preferably, the outer part of the guide pipe is covered with a first heat preservation layer.

[0007] Preferably, the flue gas pipeline is provided with a first air guide pipe, one end of the first air guide pipe is connected with an air compressor arranged outside the flue gas pipeline, the other end is connected with a second air guide pipe arranged outside the flue gas pipeline, the second air guide pipe is connected with a jet pipe arranged in the smelting furnace, and a plurality of jet holes are formed in the surface of the jet pipe.

[0008] Preferably, the first air guide pipe is a wave-shaped pipeline.

[0009] Preferably, the outer part of the second air guide pipe is covered with a second heat preservation layer.

[0010] Preferably, the jet pipe is arranged obliquely, and an angle between a central axis and a horizontal plane is 5-15 degrees.

[0011] Preferably, a plurality of the jet holes are arranged spirally along a length direction of the jet pipe.

[0012] Preferably, a gas supply pipe is connected between the air compressor and the first air guide pipe, and a pressure flow regulating valve is arranged on the gas supply pipe.

[0013] Compared with the prior art, the utility model has the beneficial effects as follows:

[0014] (1) The utility model effectively utilizes the waste heat of flue gas to preheat the regenerated lead raw material, can improve the smelting efficiency, can effectively utilize the heat, reduces the energy waste, reduces the production cost, and is suitable for promotion.

[0015] (2) The utility model utilizes the waste heat of flue gas to preheat the compressed gas, generates airflow to stir the liquid lead and improve the smelting efficiency, avoids the cold air to enter and reduce the temperature of the liquid lead, and further enhances the utilization rate of the flue gas heat. BRIEF DESCRIPTION OF DRAWINGS

[0016] Other features, objects and advantages of the utility model will become more apparent through reading the following detailed description of non-restrictive embodiments with reference to the accompanying drawings.

[0017] Figure 1 It is a structural schematic view of the utility model;

[0018] In the figure: 1, smelting furnace, 101, feed inlet, 2, preheating box, 201, feeding port, 202, discharge port, 3, top cover, 4, flue gas pipeline, 5, material guide pipe, 6, heat conduction plate, 7, preheating cavity, 8, exhaust pipe, 9, first heat preservation layer, 10, first air guide pipe, 11, air compressor, 12, second air guide pipe, 13, jet pipe, 14, jet hole, 15, second heat preservation layer, 16, gas supply pipe, 17, pressure flow regulating valve, 18, liquid lead, 19, burner, 20, burner. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the utility model will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the utility model. Obviously, the described embodiments are only a part of the embodiments of the utility model, not all the embodiments.

[0020] In the description of this utility model, it should be understood that the terms "middle", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] In this utility model, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," "link," and "fix" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection; a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0022] like Figure 1 As shown, a waste heat utilization device for recycled lead smelting flue gas includes a smelting furnace 1 and a preheating box 2. A burner 19 is located at the top of the smelting furnace, with burner nozzles 20 extending through the top wall of the furnace body into the interior. The structure of the smelting furnace in the attached diagram is only schematic and other common functional components of smelting furnaces, such as lead outlets, slag outlets, and skimmers, are not shown; these are existing technologies and will not be described in detail here. A feeding port 201 is located at the top of the preheating box, with a top cover 3 at the feeding port. The top cover and feeding port are connected by a threaded connection for convenient feeding. A discharge port 202 is located on the lower side of one side of the preheating box. A feed inlet 101 is located on one side of the upper end of the smelting furnace, and a flue gas pipe 4 is located on the other side. A guide pipe 5 connects the discharge port and the feed inlet. An inclined heat-conducting plate 6 is located inside the preheating box, with its lower end connected to the discharge port. The recycled lead raw material fed into the preheating box is guided by gravity... The hot plate enters the smelting furnace through the discharge port, guide pipe, and inlet, thus feeding the furnace. The heat-conducting plate is made of stainless steel, and a preheating chamber 7 is provided between the heat-conducting plate and the bottom wall of the preheating box. The flue gas pipe is connected to the preheating chamber, and an exhaust pipe 8 is connected to the side of the preheating chamber away from the flue gas pipe. The flue gas transfers waste heat to the recycled lead raw material through the heat-conducting plate for preheating treatment. This not only improves the subsequent smelting efficiency of the recycled lead raw material but also effectively utilizes the waste heat of the flue gas, reducing energy waste. To reduce heat loss, the guide pipe is covered with a first insulation layer 9.

[0023] like Figure 1As shown, the flue gas pipeline is provided with a first air guide pipe 10, the first air guide pipe is a wave-shaped pipeline, which increases the contact area with the flue gas in the flue gas pipeline and enhances the preheating effect, one end of the first air guide pipe is connected with an air compressor 11 arranged outside the flue gas pipeline, the other end is connected with a second air guide pipe 12 arranged outside the flue gas pipeline, the second air guide pipe is connected with a jet pipe 13 arranged in the smelting furnace, the second air guide pipe is covered with a second heat preservation layer 15 outside, which reduces the heat loss, a plurality of jet holes 14 are arranged on the surface of the jet pipe, the jet pipe is arranged in the liquid lead in the smelting furnace, high-pressure air is provided by the air compressor, the high-pressure air is preheated by the flue gas waste heat in the first air guide pipe, the preheated high-pressure air is sprayed out from the jet holes after passing through the second air guide pipe and the jet pipe to generate air flow to agitate the liquid lead, improve the uniformity and smelting efficiency, the jet pipe is arranged obliquely, the included angle between the central axis and the horizontal plane is 5°-15°, and the included angle in the embodiment is 10°, the plurality of jet holes are arranged in a spiral shape along the length direction of the jet pipe, multi-directional air injection improves the agitation range, avoids the existence of dead angle, and improves the stirring efficiency. The air compressor is connected with the first air guide pipe through a gas supply pipe 16, and a pressure flow regulating valve 17 is arranged on the gas supply pipe, so that the pressure and flow of the compressed air can be conveniently adjusted.

[0024] The working principle of the utility model is as follows:

[0025] As Figure 1 shown, in the process of regenerating lead smelting, the burner 19 works to smelt the raw materials of regenerating lead to melt them into liquid lead, the flue gas generated in the smelting process enters the preheating cavity 7 through the flue gas pipeline 4, the raw materials intermittently fed into the preheating box 2 can be preheated, the preheated flue gas is discharged through the exhaust pipe 8 for subsequent flue gas purification treatment, and the preheated raw materials enter the smelting furnace through the heat-conducting plate 6, the material guide pipe 5 and the feeding port 101. In the smelting process, the compressed air generated by the air compressor 11 enters the first air guide pipe 10 through the gas supply pipe 16, the air in the first air guide pipe 10 is preheated by the flue gas, and then is sprayed out from the jet holes 14 through the second gas supply pipe 12 and the jet pipe 13 to generate air flow to stir the liquid lead and improve the smelting efficiency. The regenerated lead after smelting is separated from the residue after being treated by the skimming device, the residue is discharged from the residue outlet, and the lead liquid is discharged from the lead outlet. The skimming treatment is prior art, and details are not described herein.

[0026] The basic principle and main features of the present application and the advantages of the present application are shown and described above, for those skilled in the art, obviously the present application is not limited to the details of the above exemplary embodiments, and can be realized in other specific forms without departing from the spirit or basic characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application.

Claims

1. A device for utilizing waste heat from recycled lead smelting flue gas, characterized in that: The device includes a smelting furnace and a preheating box. The top of the preheating box is equipped with a feeding port and a top cover. The lower part of one side of the preheating box is equipped with a discharge port. The upper side of the smelting furnace is equipped with a feeding port and a flue gas pipe on the other side. A guide pipe connects the discharge port and the feeding port. The preheating box is equipped with an inclined heat-conducting plate. The lower end of the heat-conducting plate is connected to the discharge port. A preheating cavity is provided between the heat-conducting plate and the bottom wall of the preheating box. The flue gas pipe is connected to the preheating cavity. An exhaust pipe is connected to the side of the preheating cavity away from the flue gas pipe.

2. The waste heat utilization device for recycled lead smelting flue gas as described in claim 1, characterized in that: The feed tube is covered with a first insulation layer.

3. The waste heat utilization device for recycled lead smelting flue gas as described in claim 1, characterized in that: The flue gas duct is provided with a first gas guide pipe. One end of the first gas guide pipe is connected to an air compressor located outside the flue gas duct, and the other end is connected to a second gas guide pipe located outside the flue gas duct. The second gas guide pipe is connected to a jet pipe located inside the smelting furnace. The surface of the jet pipe is provided with a plurality of jet holes.

4. The waste heat utilization device for recycled lead smelting flue gas as described in claim 3, characterized in that: The first air guide tube is a corrugated pipe.

5. The waste heat utilization device for recycled lead smelting flue gas as described in claim 3, characterized in that: The second air duct is covered with a second insulation layer.

6. The waste heat utilization device for recycled lead smelting flue gas as described in claim 3, characterized in that: The jet pipe is inclined, with its central axis forming an angle of 5°-15° with the horizontal plane.

7. The waste heat utilization device for recycled lead smelting flue gas as described in claim 3, characterized in that: The plurality of jet holes are arranged in a spiral along the length of the jet pipe.

8. The waste heat utilization device for recycled lead smelting flue gas as described in claim 3, characterized in that: An air supply pipe is connected between the air compressor and the first air guide pipe, and a pressure and flow regulating valve is provided on the air supply pipe.

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