Slag flushing water waste heat recovery system and smelting system

Abstract

The embodiment of the utility model provides a slag flushing water waste heat recovery system and a smelting system. The slag flushing water waste heat recovery system comprises spraying equipment, a water storage tank, a pulse heat exchange unit and a cold source chamber shell. The spraying equipment is provided with a liquid inlet pipe and a spraying head, and a liquid inlet of the liquid inlet pipe is communicated with a slag flushing system of the metallurgical furnace; the pulsation heat exchange unit is arranged above the water storage tank, the pulsation heat exchange unit comprises an evaporation end and a condensation end which are communicated, the evaporation end and the condensation end are both filled with phase change materials, and the spraying head is arranged towards the evaporation end; the cold source chamber shell is arranged outside the condensation end in a covering mode, and the cold source chamber shell and the condensation end form a heat exchange channel for cold water to pass through. Therefore, the slag flushing water waste heat recovery system has the advantages that the equipment size is reduced, and the energy utilization rate is high.

Description

Technical Field

[0001] The utility model relates to the technical field of smelting, in particular to a slag flushing water waste heat recovery system and a smelting system with the slag flushing water waste heat recovery system. Background Art

[0002] In the smelting process, the main products produced are non-ferrous metals, and at the same time, smelting furnace slag is produced, which is called metallurgical furnace slag flushing. The metallurgical furnace slag flushing is made into metallurgical furnace slag flushing water after water extraction. As a low-temperature waste heat source, it has the characteristics of stable temperature and large flow rate. Therefore, how to recover and utilize the waste heat of the metallurgical furnace slag flushing water has become a new problem in the existing smelting process. For example, recovering the waste heat of the metallurgical furnace slag flushing water and simply applying it to winter heating, this recovery and utilization method has simple technical requirements and low transformation costs.

[0003] In the related art, a water pump runs at a high speed to drive a heat exchanger to work, and heat is exchanged with the slag flushing water to recover its heat. However, in actual use, due to the periodicity of metallurgical furnace smelting, the process of producing metallurgical furnace slag flushing water by extracting metallurgical furnace slag flushing is also periodic. When the metallurgical furnace does not flush slag, the slag flushing water will stop, and the recovered heat source is not continuous. If the water pump keeps running at a high speed all the time, it will cause a large amount of energy waste. Since the metallurgical furnace slag flushing water has strong corrosiveness, it is easy to scale. When the grade of the recovered water is low and cannot be directly utilized, a flash tank needs to be equipped for conversion. When the amount of raw water is large, the flash evaporation device requires a large heat transfer area, and the energy consumption and operation cost are high. Summary of the Utility Model

[0004] The utility model aims to solve at least one of the technical problems in the related art to a certain extent. For this reason, an embodiment of the utility model proposes a slag flushing water waste heat recovery system. The slag flushing water waste heat recovery system has the advantages of low energy consumption, water conservation, reduced equipment size and construction cost.

[0005] An embodiment of the utility model also proposes a smelting system.

[0006] The slag flushing water waste heat recovery system of the embodiment of the utility model includes a spraying device, a reservoir, a pulsating heat exchange unit and a cold source chamber housing.

[0007] The spray device has a liquid inlet pipe and a spray head. The liquid inlet of the liquid inlet pipe is communicated with the slag flushing system of the metallurgical furnace. The pulsating heat exchange unit is arranged above the reservoir. The pulsating heat exchange unit includes a connected evaporation end and a condensation end. Phase change materials are filled in both the evaporation end and the condensation end. The spray head is arranged towards the evaporation end so as to heat the phase change material in the evaporation end through the spray water of the spray device. The cold source chamber housing covers the outside of the condensation end, and the cold source chamber housing and the condensation end form a heat exchange channel for cold water to pass through so as to heat the incoming cold water.

[0008] In the slag flushing water waste heat recovery system according to the embodiment of the present invention, by arranging the spray head towards the evaporation end, the phase change material in the evaporation end can be heated through the spray water of the spray device. While maintaining the same heat dissipation effect, it helps to reduce the size of the heat exchange device. And compared with the problems of high energy consumption and high operation cost caused by the utilization of waste water by a flash evaporation tank in the related art, the cold source chamber housing and the condensation end form a heat exchange channel for cold water to pass through so as to heat the incoming cold water, thereby realizing the recovery and utilization of the heat in the slag flushing system of the metallurgical furnace, avoiding the waste of energy caused by directly discharging the waste water generated in the slag flushing of the metallurgical furnace, and improving the thermal energy utilization.

[0009] At the same time, in the slag flushing water waste heat recovery system according to the embodiment of the present invention, the phase change material fluid in the pulsating heat exchange unit transfers heat in the form of latent heat of vaporization. The operation of the pulsating heat exchange unit is less affected by gravity. The pulsating heat exchange unit is applicable to different heating methods and heating positions. Therefore, the pulsating heat exchange unit technology is applied to the slag flushing water waste heat recovery system. Thus, the slag flushing water waste heat recovery system reduces the equipment size, simplifies the production process and saves costs.

[0010] In addition, the spray device is arranged above the reservoir. The circulating water is at the bottom of the reservoir. The spray device circulates the slag flushing water in the slag flushing system of the metallurgical furnace to cool the evaporation end. After heat exchange, it enters the reservoir and then flows to the bottom of the reservoir to be collected and then circulated into the slag flushing tank.

[0011] Therefore, the slag flushing water waste heat recovery system according to the embodiment of the present invention has the advantages of low energy consumption, water conservation, reduced equipment size and construction cost.

[0012] In some embodiments, the pulsating heat exchange unit includes a plurality of heat exchange tubes. Each heat exchange tube has multiple sections of the evaporation end and multiple sections of the condensation end. The multiple sections of the condensation end and the multiple sections of the condensation end are arranged opposite to each other in the first direction.

[0013] In some embodiments, the slag flushing water waste heat recovery system further includes a vacuum pump, and the vacuum pump is communicated with the heat exchange channel.

[0014] In some embodiments, the number of the spray heads is plural. One end of the liquid inlet pipe is connected to the reservoir, and the other end of the liquid inlet pipe extends above the evaporation end. The plural spray heads are arranged at intervals along the extending direction of the evaporation end.

[0015] In some embodiments, the slag granulating water waste heat recovery system further includes a liquid distribution pipe. In the vertical direction, the liquid distribution pipe is arranged between the evaporation end and the spray heads so as to disperse the sprayed water.

[0016] In some embodiments, the slag granulating water waste heat recovery system further includes a steam-water separator. The steam-water separator is arranged in the area of the heat exchange channel close to the exhaust port to prevent the heated gas in the heat exchange channel from discharging with water.

[0017] In some embodiments, the included angle between the condensation end and the horizontal direction is 0° or 90°, and the first direction and the second direction are perpendicularly arranged.

[0018] In some embodiments, the condensation end is arranged in a plate shape.

[0019] In some embodiments, the reservoir has a waste water outlet. The waste water outlet can be communicated with the slag granulating system of the metallurgical furnace through a pipeline so as to form the recycling of the treated water.

[0020] The smelting system of the embodiment of the present invention includes a slag granulating system of a metallurgical furnace and the slag granulating water waste heat recovery system according to any one of the above. The slag granulating system of the metallurgical furnace is communicated with the spraying device.

[0021] In some embodiments, the slag granulating system of the metallurgical furnace includes a slag granulating pool and a filtering device. In the flowing direction of the slag granulating water, the slag granulating pool, the filtering device and the spraying device are arranged in sequence.

[0022] In some embodiments, the exhaust port of the heat exchange channel is communicated with the municipal heating system. Description of the Drawings

[0023] Figure 1 is the layout diagram of the slag granulating water waste heat recovery system of the embodiment of the present invention.

[0024] Figure 2 is Figure 1 the cross-sectional view along the line a-a direction in one embodiment.

[0025] Figure 3 is Figure 1 the cross-sectional view along the line a-a direction in another embodiment.

[0026] Figure 4 is Figure 1 the cross-sectional view along the line b-b direction.

[0027] Figure 5 is Figure 1 The cross-sectional view along the c-c direction of the line.

[0028] Reference numerals:

[0029] Water storage tank 1; Waste water outlet 11;

[0030] Spray head 2;

[0031] Pulsating heat exchange unit 3; Evaporation end 31; Condensation end 32;

[0032] Cold source chamber housing 4; Cold water inlet 41; Steam outlet 42;

[0033] Vacuum pump 5;

[0034] Liquid distribution pipe 6;

[0035] Gas-liquid separator 7. Specific implementation mode

[0036] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.

[0037] Below with reference to Figures 1-5 Describe the slag flushing water waste heat recovery system and smelting system of the embodiments of the present invention.

[0038] The slag flushing water waste heat recovery system of the embodiments of the present invention includes a spraying device, a water storage tank 1, a pulsating heat exchange unit 3 and a cold source chamber housing 4.

[0039] The spraying device has a liquid inlet pipe and a spray head 2. The liquid inlet of the liquid inlet pipe is communicated with the slag flushing system of the metallurgical furnace; the pulsating heat exchange unit 3 is arranged above the water storage tank 1. The pulsating heat exchange unit 3 includes a connected evaporation end 31 and a condensation end 32. Phase change materials are filled in both the evaporation end 31 and the condensation end 32. The spray head 2 is arranged facing the evaporation end 31 so as to heat the phase change material in the evaporation end 31 through the sprayed water of the spraying device; the cold source chamber housing 4 covers the outside of the condensation end 32, and the cold source chamber housing 4 and the condensation end 32 form a heat exchange channel for passing cold water to heat the introduced cold water. It can be understood that the spray head 2 of the spraying device is also arranged above the water storage tank 1, and circulating water is arranged in the water storage tank 1.

[0040] In the slag flushing water waste heat recovery system according to the embodiment of the present utility model, the spray head 2 is arranged towards the evaporation end 31, so that the phase change material in the evaporation end 31 can be heated by the sprayed water of the spraying device. While maintaining the same heat dissipation effect, it helps to reduce the size of the heat exchange device. And compared with the problem of high energy consumption and high operation cost caused by the utilization of waste water by a flash tank in the related art, the cold source chamber housing 4 and the condensation end 32 form a heat exchange channel for the passage of cold water to heat the incoming cold water, thereby realizing the recovery and utilization of the heat in the metallurgical furnace slag flushing system, avoiding the waste of energy caused by directly discharging the waste water generated in the metallurgical furnace slag flushing, and improving the thermal energy utilization.

[0041] Meanwhile, in the slag flushing water waste heat recovery system according to the embodiment of the present utility model, the phase change material fluid in the pulsating heat exchange unit 3 transfers heat in the form of latent heat of vaporization. The operation of the pulsating heat exchange unit is less affected by gravity. The pulsating heat exchange unit 3 is applicable to different heating methods and heating positions. Therefore, the technology of the pulsating heat exchange unit 3 is applied to the slag flushing water waste heat recovery system. Thus, the slag flushing water waste heat recovery system reduces the equipment size, simplifies the production process and saves costs.

[0042] In addition, the spraying device is arranged above the water storage tank 1, and the circulating water is at the bottom of the water storage tank 1. The spraying device circulates the slag flushing water in the metallurgical furnace slag flushing system to cool the evaporation end 31. After heat exchange, it enters the water storage tank 1 and then flows to the bottom of the water storage tank 1 to be collected and then circulated into the slag flushing tank.

[0043] Therefore, the slag flushing water waste heat recovery system according to the embodiment of the present utility model has the advantages of low energy consumption, water conservation, reduced equipment size and construction cost.

[0044] Optionally, a heat insulation layer can be arranged between the evaporation end 31 and the condensation end 32.

[0045] As Figure 1 and Figure 5 shown, the cold source chamber housing 4 has a cold water inlet 41 and a steam outlet 42 arranged oppositely.

[0046] As Figure 1 and Figure 5 shown, the pulsating heat exchange unit includes a plurality of heat exchange tubes, and each of the heat exchange tubes has multiple sections of the evaporation end 31 and multiple sections of the condensation end 32. The multiple sections of the evaporation end 31 and the multiple sections of the condensation end 32 are arranged oppositely along the first direction (for example, Figure 1 the left-right direction shown in

[0047] The waste heat recovery system for slag flushing water of the utility model embodiment is helpful to improve the heat exchange area of the system by dividing the evaporation end 31 and the condensation end 32 into multiple sections, thereby helping to improve the heat exchange efficiency of the system. In addition, the evaporation end 31 and the condensation end 32 are alternately arranged in sequence along the extension direction of the pulsating heat exchange unit 3, and the evaporation end 31 and the condensation end 32 are filled with phase change materials. During operation, the phase change material inside it will phase change heat during the phase change process. For example, heat is transferred from the evaporation end 31 to the condensation end 32, and the phase change material at the evaporation end 31 is in a liquid section, and the liquid working fluid absorbs heat and produces gasification, and then continuously absorbs heat to form a new steam section, and the steam section is heated and evaporated, and the pressure continues to increase and pushes the adjacent liquid plug to flow to the condensation end 32. The steam column shrinks at the condensation end 32, so that a large pressure difference is formed between the cold and hot sections (evaporation end 31 and condensation end 32). Due to the staggered distribution of the vapor and liquid plungers, a strong reciprocating oscillation motion is generated in the pulsating heat exchange unit 3, thereby achieving efficient heat transfer. Therefore, the slag flushing water waste heat recovery system has the advantage of high heat exchange efficiency.

[0048] Furthermore, the heat exchange tube is in an S-shaped coil shape.

[0049] like Figure 1 As shown, the slag flushing water waste heat recovery system of the embodiment of the utility model further includes a vacuum pump 5, and the vacuum pump is connected to the heat exchange channel.

[0050] Furthermore, a connecting pipe may be provided on the heat exchange channel, the connecting pipe is connected to the vacuum pump 5 , and a one-way valve is provided on the connecting pipe.

[0051] like Figure 1 As shown, there are multiple spray heads 2, one end of the liquid inlet pipe is connected to the water reservoir 1, and the other end of the liquid inlet pipe extends above the evaporation end 31, and the multiple spray heads 2 are arranged at intervals along the first direction of the condensation end 32.

[0052] The slag flushing water waste heat recovery system of the embodiment of the utility model helps to improve the uniformity of heating the evaporation end 31 by disposing multiple spray heads 2 above the evaporation end 31, thereby helping to improve the cooling efficiency of the phase change material in the evaporation end 31.

[0053] Optionally, a circulating water pump is provided on the liquid inlet pipe of the spraying equipment so that the water in the water reservoir 1 can be circulated through the circulating water pump.

[0054] like Figure 1 and Figure 5 As shown, the waste heat recovery system for slag flushing water of the embodiment of the utility model further includes a liquid distribution pipe 6. In the up and down direction, the liquid distribution pipe 6 is arranged between the evaporation end 31 and the spray head 2 to disperse the spray water. In other words, the spray head 2, the liquid distribution pipe 6 and the evaporation end 31 are arranged in sequence from high to low.

[0055] In the slag flushing water waste heat recovery system according to the embodiment of the present utility model, the circulating water sprayed by the spraying device can be evenly formed into a film on the surface of the pulsating heat exchange unit 3 through the arranged liquid distribution pipe 6 for heat exchange, which helps to form a hanging water film on the evaporation end 31, and after the formation of the water film, it helps to further improve the heat transfer efficiency.

[0056] The slag flushing water waste heat recovery system further includes a steam-water separator 7, and the steam-water separator 7 is arranged in the area near the exhaust port of the heat exchange channel to prevent the steam from discharging with water.

[0057] Such as Figure 2 and Figure 3 As shown, the included angle between the condensation end 32 and the second direction (horizontal direction) is 0° or 90°, and the first direction and the second direction are perpendicularly arranged.

[0058] In the slag flushing water waste heat recovery system according to the embodiment of the present utility model, by setting the included angle between the condensation end 32 and the horizontal direction to be 0° or 90°, it is convenient to lay out the pipe body, and it has the advantage of high laying convenience.

[0059] In other embodiments, the condensation end 32 can be inclined. So that the water sprayed by the spray head 2 forms a water film on the condensation end 32 and then moves and falls along the direction of the condensation end 32, which improves the contact time between the condensed water and the condensation end 32 and is beneficial to improving the condensation efficiency. In addition, the inclined setting can facilitate on-site installation.

[0060] The condensation end 32 is arranged in a plate shape. Because generally the pipe diameter of the condensation end 32 is relatively thin, under the continuous phase change of the phase change material, its structural strength is relatively low. The condensation end 32 and the cold source chamber housing 4 are arranged in a plate shape to form a heat exchange plate, which can improve the overall structural strength of this part. Thus, the slag flushing water waste heat recovery system according to the embodiment of the present utility model has the advantage of high structural strength. For example, stainless steel pipes or copper pipes.

[0061] The reservoir has a waste water outlet 11, and the waste water outlet 11 can be connected to the metallurgical furnace slag flushing system through a pipeline so as to form a recycling of the treated water. In this way, the slag flushing water waste heat recovery system has the advantage of further saving water resources.

[0062] The smelting system according to the embodiment of the present utility model includes a metallurgical furnace slag flushing system and the slag flushing water waste heat recovery system according to any one of the above, the metallurgical furnace slag flushing system is connected to the spraying device, and the exhaust port of the heat exchange channel is connected to the municipal heating system.

[0063] Therefore, the smelting system according to the embodiment of the present utility model has the advantages of reducing the equipment size and saving water.

[0064] The drain outlet of the reservoir 1 is connected to the slag flushing tank so as to utilize the liquid in this part. In the smelting system, the slag flushing water or waste water at about 90 °C needs to be filtered and recycled to the waste heat recovery system of the slag flushing water.

[0065] It is transported to the top of the box body and enters the liquid inlet pipe, and then evenly descends in a film to the surface of the tubular pulsating heat pipe through the liquid distribution pipe. After heat exchange, it flows to the bottom of the reservoir and is discharged. The discharged slag flushing water can return to the metallurgical furnace slag flushing system for recycling, and the discharged waste water is further treated for recovery or discharge. The treated water enters the heat exchanger from the bottom of the shell of the condensation end 32. Under vacuum conditions, after heat exchange through the pulsating heat exchange unit 3, it is phase-changed into steam and transported out as a heat source.

[0066] The metallurgical furnace slag flushing system includes a slag flushing tank and a filtering device. According to the flowing direction of the slag flushing water, the slag flushing tank, the filtering device and the spraying device are arranged in sequence. Thus, the influence of impurities on the spraying device can be reduced through the filtering device.

[0067] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0068] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0069] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection or communicable with each other; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0070] In the present utility model, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is less than that of the second feature.

[0071] In the present utility model, the terms "an embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0072] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present utility model.

Claims

1. A slag flushing water waste heat recovery system, characterized in that Comprising: A spraying device having a liquid inlet pipe and a spray head, and the liquid inlet of the liquid inlet pipe can be communicated with the slag flushing system of the metallurgical furnace; A reservoir and a pulsating heat exchange unit, the pulsating heat exchange unit is arranged above the reservoir, the pulsating heat exchange unit includes a communicated evaporation end and a condensation end, and phase change materials are filled in both the evaporation end and the condensation end, and the spray head is arranged towards the evaporation end so as to heat the phase change material in the evaporation end by the sprayed water of the spraying device; A cold source chamber housing, the cold source chamber housing covers the outside of the condensation end, and the cold source chamber housing and the condensation end form a heat exchange channel for passing cold water to heat the introduced cold water.

2. The slag flushing water waste heat recovery system according to claim 1, wherein, The pulsating heat exchange unit includes a plurality of heat exchange tubes, each heat exchange tube has multiple sections of the evaporation end and multiple sections of the condensation end, and the multiple sections of the condensation end and the multiple sections of the condensation end are arranged oppositely along the first direction.

3. The slag flushing water waste heat recovery system according to claim 2, wherein, It further includes a vacuum pump, and the vacuum pump is communicated with the heat exchange channel.

4. The slag flushing water waste heat recovery system according to claim 1, wherein The number of the spray heads is multiple, one end of the liquid inlet pipe is connected to the reservoir, the other end of the liquid inlet pipe extends above the evaporation end, and the multiple spray heads are arranged at intervals along the extending direction of the evaporation end.

5. The slag flushing water waste heat recovery system according to claim 4, characterized in that, It further includes a liquid distribution pipe, and in the vertical direction, the liquid distribution pipe is arranged between the evaporation end and the spray head to disperse the sprayed water.

6. The slag flushing water waste heat recovery system according to claim 4, wherein, It further includes a steam-water separator, and the steam-water separator is arranged in the area near the exhaust port of the heat exchange channel to prevent the heated gas in the heat exchange channel from discharging with water.

7. The slag flushing water waste heat recovery system according to claim 2, characterized in that, The included angle between the condensation end and the second direction is 0° or 90°, and the first direction and the second direction are perpendicularly arranged.

8. The slag flushing water waste heat recovery system according to claim 1, characterized in that The condensation end is arranged in a plate shape; and / or, the reservoir has a waste water outlet, and the waste water outlet can be communicated with the slag flushing system of the metallurgical furnace through a pipeline to form a recycling of the treated water.

9. A smelting system, characterized in that, Comprising a metallurgical furnace slag flushing system and a slag flushing water waste heat recovery system according to any one of claims 1-8, and the metallurgical furnace slag flushing system is communicated with the liquid inlet pipe.

10. The smelting system according to claim 9, characterized in that, The metallurgical furnace slag flushing system includes a slag flushing pool and a filtering device, and in the flowing direction of the slag flushing water, the slag flushing pool, the filtering device and the spraying device are arranged in sequence; and / or, the exhaust port of the heat exchange channel is communicated with the municipal heating system.

Images