Waste heat recovery power generation equipment for metallurgical high-temperature granulated slag

Abstract

The utility model discloses waste heat recovery power generation equipment for metallurgical high-temperature granulated slag, which belongs to the technical field of waste heat recovery equipment and comprises a fan, a heat exchange tube, a slag inlet and a slag outlet, the slag inlet is positioned between the fan and the heat exchange tube, the slag outlet is positioned at one end of the heat exchange tube far away from the fan, and the fan is connected with the heat exchange tube. The heat exchange pipes comprise the first heat exchange pipe and the second heat exchange pipe located behind the first heat exchange pipe in the air supply direction, the first heat exchange pipe comprises at least one heat exchange layer, and the second heat exchange pipe comprises at least one heat exchange layer and at least one power generation layer. According to the utility model, high-pressure air containing metallurgical high-temperature granulated slag firstly passes through the first heat exchange tube for primary heat exchange, so that the temperature of the metallurgical high-temperature granulated slag reaching the second heat exchange tube meets the working temperature of the thermoelectric power generation sheet, and then passes through the second heat exchange tube for power generation and heat exchange at the same time; high waste heat energy level and recovery efficiency can be achieved, and the power generation efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the waste heat recovery equipment technical field, more specifically, relate to a kind of waste heat recovery power generation equipment of metallurgical high-temperature granulation slag. BACKGROUND

[0002] Metallurgical blast furnace slag is the main byproduct of blast furnace ironmaking, and the discharge temperature is generally 1623~1723K. 300~600kg of blast furnace slag is produced per ton of pig iron. According to statistics, the crude steel output of China in 2023 was 1.02 billion tons, and more than 300 million tons of blast furnace slag was produced. Each ton of blast furnace slag contains 1.8GJ of heat, equivalent to 60kg of standard coal. Recycling and utilizing the waste heat of blast furnace slag is crucial for energy saving and emission reduction in the ironmaking industry and improving secondary energy efficiency.

[0003] Currently, water quenching method is widely used in industry to treat blast furnace slag, and the temperature of the quenching water is kept at 60~80℃ all year round. There are problems of low waste heat energy level, low recovery efficiency, large water consumption and easy secondary pollution. Based on the problems of water quenching method, dry method for treating blast furnace slag is paid attention to and tried.

[0004] Currently, water quenching method is widely used in industry to treat blast furnace slag, and the temperature of the quenching water is kept at 60~80℃ all year round. There are problems of low waste heat energy level, low recovery efficiency, large water consumption and easy secondary pollution. Based on the problems of water quenching method, dry method for treating blast furnace slag is paid attention to and tried.

[0005] After searching, patent CN107659209A discloses a thermoelectric power generation module based on flat plate heat pipe and a heat pipe circulating waste heat thermoelectric power generation system formed by the module, wherein the thermoelectric power generation module based on flat plate heat pipe includes a thermoelectric power generation unit, a shell and a fan. A plurality of groups of porous parallel flow flat tubes are arranged in parallel in the thermoelectric power generation unit. Thermoelectric power generation sheets and heat dissipation ribs are installed in close proximity on the left and right sides of the porous parallel flow flat tubes. The upper and lower ends of the porous parallel flow flat tubes are inserted into the gas collector and the liquid collector respectively, forming an integrated thermoelectric power generation module. A plurality of groups of thermoelectric power generation modules, waste heat pipe internal heat exchangers, gas pipelines and liquid pipelines form a heat pipe circulating waste heat thermoelectric power generation system. The waste heat in the pipeline is efficiently transferred to each thermoelectric power generation module for power generation through gravity heat pipe circulation.

[0006] Patent CN108548439A discloses a flue gas waste heat power generation device and a flue gas waste heat system, wherein the flue gas waste heat power generation device includes a heat exchange device, a heat collecting device, a thermoelectric generator and a heat dissipation device. The heat exchange device is provided with at least one flow channel for the flow of heat conducting medium. The heat collecting device is located above the heat exchange device, and the heat collecting device is arranged on one side of the thermoelectric generator. The heat dissipation device is arranged on the other side of the thermoelectric generator, and one side of the thermoelectric generator is opposite to the other side.

[0007] However, the above patent has low waste heat energy level, limited recovery efficiency, and affects power generation efficiency, which is not suitable for using low temperature power generation elements. SUMMARY

[0008] 1. Problem to be solved

[0009] To solve the problem that the existing device cannot realize low waste heat energy level, limited recovery efficiency, and limited power generation efficiency, the utility model provides a kind of waste heat recovery power generation equipment of metallurgical high temperature granulation slag, and the equipment can realize higher waste heat energy level and recovery efficiency by the reasonable design of heat exchange pipe, improve power generation efficiency.

[0010] 2. Technical scheme

[0011] To solve the above problem, the utility model adopts the following technical scheme.

[0012] The utility model provides a kind of waste heat recovery power generation equipment of metallurgical high temperature granulation slag, it includes: fan, heat exchange pipe, into slag port and slag outlet, the into slag port is located between fan and heat exchange pipe, the slag outlet is located at the end of heat exchange pipe far from fan, and the fan is used to into high pressure air to first heat exchange pipe and second heat exchange pipe.

[0013] Wherein, the heat exchange pipe includes first heat exchange pipe and second heat exchange pipe after first heat exchange pipe according to air supply direction, the into slag port is opened between fan and first heat exchange pipe, the slag outlet is located at the rear end of second heat exchange pipe, and the first heat exchange pipe includes at least one heat exchange layer, and the second heat exchange pipe includes at least one heat exchange layer and at least one power generation layer.

[0014] Wherein, the power generation layer includes thermoelectric generator sheet, and the thermoelectric generator sheet is arranged between second heat exchange pipe and heat exchange layer.

[0015] Further, the thermoelectric generator sheet is provided with heat dissipation fins, the heat dissipation fins are located between heat exchange layer and thermoelectric generator sheet, the heat dissipation fins are linear array fixed on the outside of thermoelectric generator sheet in series, the hot end of thermoelectric generator sheet is close to second heat exchange pipe, the cold end is close to heat dissipation fin, can form stable temperature difference, realize thermoelectric direct conversion.

[0016] The outer wall of the heat exchange pipe is provided with at least one heat exchange layer, and the heat exchange layer includes at least one insulating heat conduction lining plate and at least one water pipeline.

[0017] Specifically, the outer layer of the first heat exchange pipe includes phase change material, insulating heat conduction lining plate and water pipeline from inside to outside, the phase change material is arranged on the outside of the first heat exchange pipe, the insulating heat conduction lining plate is arranged on the outside of the phase change material, and the water pipeline is arranged on the outside of the insulating heat conduction lining plate. By arranging phase change material on the outside of the first heat exchange pipe, it is beneficial to the heat exchange of metallurgical high temperature granulation slag.

[0018] Specifically, the second heat exchange tube includes heat dissipation fins, an insulating thermally conductive liner, and a water supply pipe, arranged from the inside out. The heat dissipation fins are connected in series and arranged in a linear array, fixed to the outside of the second heat exchange tube. The water supply pipe is located at the end of the heat dissipation fins away from the second heat exchange tube. An insulating thermally conductive liner is provided between the water supply pipe and the heat dissipation fins. The insulating thermally conductive liner improves the heat absorption effect, ensuring sufficient heat exchange with the water in the water supply pipe.

[0019] Furthermore, the slag inlet is equipped with a slag feeding funnel for feeding metallurgical high-temperature granulated slag into the first heat exchange tube.

[0020] Furthermore, a water valve is provided between the water supply pipe outside the first heat exchange tube and the water supply pipe outside the second heat exchange tube, which can control the flow of water outside the first heat exchange tube and the second heat exchange tube.

[0021] Furthermore, the inner wall of the second heat exchange tube is provided with two intersecting flat hot plates, which divides the second heat exchange tube into at least two slag conveying pipes, through which high-pressure air containing metallurgical high-temperature granulated slag flows out of the slag outlet.

[0022] Furthermore, the water pipeline is arranged in an "S" shape, which extends the water flow path and thus increases the heat exchange time between the water and the high-temperature granulated slag in metallurgy.

[0023] 3. Beneficial effects

[0024] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0025] (1) The present invention provides a waste heat recovery power generation device for metallurgical high-temperature granulated slag, wherein at least one heat exchange layer is provided outside the first heat exchange tube, and at least one heat exchange layer and at least one power generation layer are provided outside the second heat exchange tube. The high-pressure air containing metallurgical high-temperature granulated slag first undergoes preliminary heat exchange through the first heat exchange tube, and then undergoes heat exchange and power generation through the second heat exchange tube, thereby achieving a higher waste heat energy level and recovery efficiency, and improving power generation efficiency.

[0026] (2) The waste heat recovery power generation equipment of metallurgical high temperature granulated slag of this utility model, through the heat exchange process in the first heat exchange tube, makes the temperature of the metallurgical high temperature granulated slag with an initial temperature of 500℃-600℃ reach the second heat exchange tube not exceed 200℃, which meets the working temperature of the thermoelectric generator, which is conducive to improving power generation efficiency and extending service life.

[0027] (3) The metallurgical high-temperature granulation furnace slag waste heat recovery power generation equipment has the heat dissipation fins arranged outside the second heat exchange pipe, improves the heat dissipation effect, keeps the outside of the thermoelectric element at a relatively low temperature, realizes the power generation function through the temperature difference of the two sides, creates stable temperature difference conditions for the thermoelectric element, and maintains the efficiency of the thermoelectric conversion. BRIEF DESCRIPTION OF DRAWINGS

[0028] The technical solutions of the present application will be described in further detail below in combination with the drawings and examples, but it should be understood that these drawings are designed only for explanatory purposes, and therefore do not limit the scope of the present application. In addition, unless specifically indicated, these drawings are only intended to conceptually illustrate the structural configuration described herein, and are not necessarily drawn to scale.

[0029] Figure 1 It is a schematic diagram of the overall cross-sectional structure of the present application;

[0030] Figure 2 It is a schematic diagram of the heat exchange pipe structure of the present application;

[0031] Figure 3 It is a schematic diagram of the second heat exchange pipe and the slag outlet structure in the present application;

[0032] Figure 4 It is a schematic diagram of the water pipeline cross-sectional structure in the present application;

[0033] In the figure: 1, fan; 2, slag inlet; 3, heat exchange pipe; 31, first heat exchange pipe; 311, phase change material; 32, second heat exchange pipe; 321, thermoelectric element; 322, heat dissipation fin; 33, flat plate heat pipe; 34, insulating heat conduction lining plate; 35, water pipeline; 351, water valve; 4, slag outlet. DETAILED DESCRIPTION

[0034] The detailed description and example embodiments of the present application below can be better understood in combination with the drawings, in which the elements and features of the present application are identified by reference numerals.

[0035] EMBODIMENT

[0036] As Figures 1-4 shown, the present application provides a metallurgical high-temperature granulation furnace slag waste heat recovery power generation equipment, which comprises: a fan 1, a heat exchange pipe 3, a slag inlet 2 and a slag outlet 4, the slag inlet 2 is located between the fan 1 and the heat exchange pipe 3, the slag outlet 4 is located at the end of the heat exchange pipe 3 away from the fan 1, and the fan 1 is used to introduce high-pressure air into the first heat exchange pipe 31 and the second heat exchange pipe 32.

[0037] In this implementation case, fan 1 is located on the far left of the equipment. The high-pressure air provided by fan 1 can drive the movement of metallurgical high-temperature granulated slag in the entire heat exchange equipment, and the high-pressure air also conducts convective heat exchange with the slag. The high-temperature flue gas from the heat exchange can be recovered for power generation and heating.

[0038] The heat exchange tube 3 includes a first heat exchange tube 31 and a second heat exchange tube 32 located after the first heat exchange tube 31 in the air supply direction. The slag inlet 2 is opened between the blower 1 and the first heat exchange tube 31, and the slag outlet 4 is located at the rear end of the second heat exchange tube 32.

[0039] The slag inlet 2 is equipped with a slag feeding funnel, which is used to feed the metallurgical high-temperature granulated slag into the first heat exchange tube 31.

[0040] The outer wall of the heat exchange tube 3 is provided with at least one heat exchange layer, which includes at least one insulating and heat-conducting liner 34 and at least one water supply pipe 35.

[0041] Furthermore, the outer wall of the heat exchange tube 3 is made of a flat plate heat pipe 33, and the flat plate heat pipe 33 is provided with at least one heat exchange layer, which includes at least one insulating heat-conducting liner 34 and at least one water supply pipe 35.

[0042] Specifically, such as Figure 2 As shown, the outer layer of the first heat exchange tube 31 includes, from the inside out, a phase change material 311, an insulating thermally conductive liner 34, and a water supply pipe 35. The phase change material 311 is disposed in a flat heat pipe 33 outside the first heat exchange tube 31. An insulating thermally conductive liner 34 is disposed outside the phase change material 311, and a water supply pipe 35 is disposed outside the insulating thermally conductive liner 34. The presence of the phase change material 311 outside the first heat exchange tube 31 enables more efficient heat exchange of high-temperature granulated metallurgical slag, ensuring that the temperature of the high-temperature granulated metallurgical slag reaching the second heat exchange tube 32 does not exceed 200°C.

[0043] The second heat exchange tube 32 includes, from the inside out, a thermoelectric generator 321, heat dissipation fins 322, an insulating thermally conductive liner 34, and a water supply pipe 35. The thermoelectric generator 321 is located in a flat heat pipe 33 outside the second heat exchange tube 32. The heat dissipation fins 322 are connected in series and fixed in a linear array outside the flat heat pipe 33 where the thermoelectric generator 321 is located. The water supply pipe 35 is located at the end of the heat dissipation fins 322 away from the second heat exchange tube 32. An insulating thermally conductive liner 34 is provided between the water supply pipe 35 and the heat dissipation fins 322.

[0044] It is worth mentioning that, since the metallurgical high-temperature granulation slag has a high temperature of 500-600 DEG C, which is much higher than the service temperature (200 DEG C) of the thermoelectric power generation sheet 321, directly passing the high-pressure air containing the metallurgical high-temperature granulation slag into the environment containing the thermoelectric power generation sheet 321 can cause damage to the thermoelectric power generation sheet 321 and reduce the service life thereof, therefore, the application passes the heat exchange process in the first heat exchange pipe 31 to make the temperature of the metallurgical high-temperature granulation slag in the second heat exchange pipe 32 not more than 200 DEG C, which is suitable for the working temperature of the thermoelectric power generation sheet 321. Since the temperature is reduced, in order to improve the power generation efficiency, the heat dissipation fins 322 are arranged outside the second heat exchange pipe 32, the heat dissipation fins 322 are arranged outside the flat plate heat pipe 33 where the thermoelectric power generation sheet 321 is located, which can not only promote the heat dissipation of the second heat exchange pipe 32, make the heat of the second heat exchange pipe 32 transferred to the water conveying pipeline 35 and exchanged with the water in the pipeline, but also promote the action of the thermoelectric power generation sheet 321, the inside of the thermoelectric power generation sheet 321 is in contact with the second heat exchange pipe 32 with a higher temperature, the outer wall is heat-dissipated, the heat is transferred to the water conveying pipeline 35 through the insulating heat-conducting lining plate 34, in order to improve the heat dissipation of the outside, the heat dissipation effect is improved, the temperature of the outside of the thermoelectric power generation sheet 321 is kept relatively low, the power generation function is realized through the temperature difference between the two sides, the stable temperature difference condition is created for the thermoelectric power generation sheet 321, and the efficiency of the thermoelectric conversion is maintained.

[0045] Further, the water valve 351 is arranged between the water conveying pipeline 35 outside the first heat exchange pipe 31 and the water conveying pipeline 35 outside the second heat exchange pipe 32, and the cooling water can flow outside the first heat exchange pipe 31 and the second heat exchange pipe 32.

[0046] In the utility model, the fan 1 is arranged on the left side of the equipment, the water conveying pipeline 35 outside the heat exchange pipe 3 is injected with cold water, in use, the metallurgical high-temperature granulation slag is passed into the first heat exchange pipe 31 through the slag conveying funnel, the fan 1 is opened to pass high-pressure air, the metallurgical high-temperature granulation slag moves between the first heat exchange pipe 31 and the second heat exchange pipe 32 to exchange heat, the cold water in the water conveying pipeline 35 outside the second heat exchange pipe 32 absorbs the heat dissipated by the heat dissipation fins 322 to realize preliminary heating, flows into the water conveying pipeline 35 outside the first heat exchange pipe 31 to continue heating after reaching a certain temperature, and the waste heat recovery efficiency is effectively improved. The thermoelectric power generation sheet 321 outside the second heat exchange pipe 32 can realize the power generation function through the temperature difference between the two sides.

[0047] Preferably, the first heat exchange pipe 31 and the second heat exchange pipe 32 are square tubes.

[0048] As Figure 3As shown, two intersecting flat heat pipes 33 are provided along the inner wall of the second heat exchange tube 32, which divides the second heat exchange tube 32 into four equal-sized slag conveying pipes. High-pressure air containing metallurgical high-temperature granulated slag flows out of the slag outlet 4 through the four slag conveying pipes, effectively increasing the heat exchange area and improving the efficiency of thermoelectric conversion.

[0049] In this embodiment, the flat heat pipe 33 is equipped with a full-surface thermoelectric generator 321. The thermoelectric generator 321 is model TEG1-199-1.4-0.5, and its maximum temperature resistance is 200℃. The hot end of the thermoelectric generator 321 is close to the second heat exchange pipe 32, and the cold end is close to the heat dissipation fins 322, which can form a stable temperature difference and realize direct thermoelectric conversion.

[0050] The water supply pipes 35 are arranged in twelve sections. Eight of these pipes are grouped into four sections and sequentially joined to form a U-shaped structure, wrapping around the outside of the first heat exchange pipe 31 and the second heat exchange pipe 32. The remaining four water supply pipes 35 are located outside the pipe connecting the first and second heat exchange pipes 31 and are equipped with water valves 351. In use, the water valves 351 are first closed, allowing the cooling water to exchange heat with the heat inside the second heat exchange pipe 32 for preheating. The cold water passing through the water supply pipes 35 outside the second heat exchange pipe 32 can reach a maximum temperature of 40°C after heat exchange. When the water valves 351 are opened, the water flows into the first heat exchange pipe 31, where the temperature is even higher, allowing the water to undergo further heat exchange and quality improvement, ultimately reaching a temperature of 90°C, which can be used for municipal heating and further improves waste heat recovery efficiency.

[0051] like Figure 4 As shown, the water pipeline is arranged in an "S" shape, which extends the water flow path, thereby increasing the heat exchange time between the water and the high-temperature granulated slag in metallurgy, and further improving the efficiency of waste heat recovery.

[0052] The inner side of the water supply pipe 35 of the first heat exchange pipe 31 and the second heat exchange pipe 32 is provided with an insulating heat-conducting liner 34 to improve the heat absorption effect, ensure sufficient heat to exchange with the water in the water supply pipe 35, reduce waste heat loss, and improve the efficiency of waste heat recovery.

[0053] The waste heat recovery power generation equipment of metallurgical high-temperature granulation slag, when in use, utilizes the slag delivery funnel to pass the high-temperature granulation slag with a temperature of 500-600 DEG C into the slag inlet 2. The fan 1 is started, the air speed is adjusted, the high-pressure air pushes the granulation slag to perform heat exchange in the heat exchanger, the heat is transferred into the water delivery pipeline 35 on the outside, meanwhile, the high-pressure air and the slag perform convection heat exchange, the high-temperature air after heat exchange is passed out from the slag outlet 4, and the high-temperature air after recovery can be further used for heating and power generation. Meanwhile, cold water is injected into the water delivery pipeline 35 on the outside of the second heat exchange tube 32, the cold water is heated by absorbing the heat radiated by the heat dissipation fins 322, when the highest temperature is about 40 DEG C, the water is flowed into the water delivery pipeline 35 on the outside of the first heat exchange tube 31 through the water valve 351, the warm water and the higher heat source perform heat exchange, the highest heating temperature can reach 90 DEG C, and the discharged hot water can be used for municipal heating, the waste heat recovery rate and utilization rate are effectively improved, and the heat exchange process does not produce steam, the uncontrollable situation is reduced, and the equipment safety is high.

[0054] The temperature of the slag after the first heat exchange tube 31 and entering the second heat exchange tube 32 can reach 200 DEG C, meets the use temperature of the temperature difference power generation sheet 321, the temperature difference power generation sheet 321 in the second heat exchange tube 32 utilizes the temperature difference to generate power when the slag passes, the heat in the second heat exchange tube 32 is continuously radiated by the heat dissipation fins 322, the temperature difference between the two ends of the temperature difference power generation sheet 321 is maintained, and the direct heat-electricity conversion is realized.

[0055] Finally, it should be noted that: the above only for the preferred embodiments of the utility model, and does not limit the utility model, although the utility model has been described in detail with reference to the foregoing embodiments, for the person skilled in the art, it still can modify the technical scheme recorded in the foregoing each embodiment, or equivalent replacement to part of technical features. Any modification, equivalent replacement, improvement etc. that is made within the spirit and principle of the utility model, should be included in the protection scope of the utility model.

Claims

1. A waste heat recovery power plant for metallurgical high temperature granulation furnace slag, comprising: Fan (1), heat exchange pipe (3), residue inlet (2) and residue outlet (4), the residue inlet (2) is located between the fan (1) and the heat exchange pipe (3), the residue outlet (4) is located at the end of the heat exchange pipe (3) away from the fan (1), the fan (1) is used for feeding high pressure air into the heat exchange pipe (3), characterized in that, The heat exchange pipe (3) comprises a first heat exchange pipe (31) and a second heat exchange pipe (32) behind the first heat exchange pipe (31) in the air supply direction, the first heat exchange pipe (31) comprises at least one heat exchange layer, and the second heat exchange pipe (32) comprises at least one heat exchange layer and at least one power generation layer.

2. The waste heat recovery power plant of claim 1, wherein, The power generation layer comprises a thermoelectric power generation sheet (321), and the thermoelectric power generation sheet (321) is arranged between the second heat exchange pipe (32) and the heat exchange layer.

3. The waste heat recovery power plant of claim 2, wherein, The thermoelectric power generation sheet (321) is externally provided with a heat dissipation fin (322), the heat dissipation fin (322) is located between the heat exchange layer and the thermoelectric power generation sheet (321), the hot end of the thermoelectric power generation sheet (321) is close to the second heat exchange pipe (32), and the cold end is close to the heat dissipation fin (322).

4. The waste heat recovery power plant of claim 1, wherein, The heat exchange layer comprises at least one insulating heat conduction lining plate (34) and at least one water pipeline (35), and the water pipeline (35) is arranged on the outer side of the insulating heat conduction lining plate (34).

5. The waste heat recovery power plant of claim 4, wherein, The outer layer of the first heat exchange pipe (31) further comprises phase change material (311), the phase change material (311) is arranged between the first heat exchange pipe (31) and the heat exchange layer, the outer side of the phase change material (311) is provided with the insulating heat conduction lining plate (34), and the outer side of the insulating heat conduction lining plate (34) is provided with the water pipeline (35).

6. The waste heat recovery power plant of claim 4, wherein, The second heat exchange pipe (32) comprises, from inside to outside, the thermoelectric power generation sheet (321), the heat dissipation fin (322), the insulating heat conduction lining plate (34) and the water pipeline (35), the water pipeline (35) is located at the end of the heat dissipation fin (322) away from the second heat exchange pipe (32), and the insulating heat conduction lining plate (34) is arranged between the water pipeline (35) and the heat dissipation fin (322).

7. The waste heat recovery power plant of claim 6, wherein, The inner wall of the second heat exchange pipe (32) is provided with mutually intersecting flat heat plates, so that the second heat exchange pipe (32) is divided into at least two residue conveying pipelines, and the residue conveying pipelines are connected with the residue outlet (4) at the ends.

8. The waste heat recovery power plant of claim 5, wherein, The water valve (351) is arranged between the water pipeline (35) outside the first heat exchange pipe (31) and the water pipeline (35) outside the second heat exchange pipe (32), so as to control the circulation of water outside the first heat exchange pipe (31) and the second heat exchange pipe (32).

9. The waste heat recovery power plant of claim 5, wherein, The water pipeline (35) is arranged in an "S" shape.

10. The waste heat recovery power plant of claim 1, wherein, The residue inlet (2) is provided with a residue feeding funnel, and the metallurgical high-temperature granulation furnace residue is fed into the first heat exchange pipe (31).

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