Immersed high-temperature slag waste heat recovery device based on fused salt heat storage

Abstract

The utility model discloses an immersed high-temperature slag waste heat recovery device based on fused salt heat storage, which comprises a recovery device shell, a particle inlet section is arranged at the upper end of the recovery device shell, high-temperature particles enter an inner cavity of the recovery device shell from the particle inlet section, a particle outlet section is arranged at the lower end of the recovery device shell, and the high-temperature particles enter the inner cavity of the recovery device shell from the particle outlet section. High-temperature particles after heat exchange are discharged from the particle outlet section, and a finned tube bundle for heat exchange is arranged on the side wall of the recovery device shell. Fused salt is adopted as a waste heat recovery medium, heat of high-temperature particles is recovered through the finned tubes arranged in the waste heat recovery device in a crossed mode, the high-temperature particles are accumulated in the device, the finned tubes are immersed in the high-temperature particles, heat exchange is enhanced, and waste heat recovery efficiency is improved. The material outlet section is matched with the conveying device, and the discharging amount of materials is controlled by controlling the speed of the conveying device, so that a material layer is maintained at a certain thickness, and the heat storage amount of fused salt is controlled.

Description

TECHNICAL FIELD

[0001] The utility model belongs to high temperature furnace slag waste heat recovery technical field, concretely relates to a kind of immersed high temperature furnace slag waste heat recovery device based on molten salt heat storage. BACKGROUND

[0002] As the most important byproduct in steel industry production, blast furnace slag is discharged at about 1400℃, with a large amount of high-quality waste heat, so the blast furnace slag waste heat resource should be recovered and utilized as much as possible.

[0003] In order to realize energy cascade utilization, most high temperature furnace slag waste heat recovery processes are divided into three steps. In the first step, high temperature furnace slag is granulated into high temperature slag particles by a high temperature slag granulation device. In the second step, the granulated high temperature slag particles enter a primary waste heat recovery device, and the high temperature particle waste heat is recovered by using air as a medium. In the third step, the high temperature slag particles after the primary waste heat recovery enter a secondary waste heat recovery device, and the heat of the slag particles at a lower temperature is recovered by using a liquid medium.

[0004] Currently, common liquid heat exchange media include water, heat-conducting oil and liquid metal. However, the temperature of blast furnace slag is very high, and the above media has the disadvantages of poor heat exchange capacity, high price, difficulty in storage, short service life, low energy storage density and large floor area. As a molten salt widely used in heat storage technology, it has the advantages of low cost, wide application temperature range, high heat capacity, low viscosity and good chemical stability, and has a good prospect in application to a steel slag waste heat recovery system. On the one hand, it has good heat exchange performance, and on the other hand, it has good heat storage performance, which provides conditions for using waste heat for urban central heating.

[0005] Currently, a horizontal device is used for waste heat recovery. The granulated particles are fed into a moving bed from the horizontal direction, and move along the horizontal direction by a transmission device. The molten salt fluid enters from below the moving bed under the action of a pump, flows through the particle bed for cross-flow heat exchange and flows out from the upper opening, to realize high temperature particle waste heat recovery. This waste heat recovery method uses molten salt to directly contact and exchange heat with particles, has high efficiency and simple structure. However, there are problems of molten salt loss and steel slag pollution caused by molten salt taken out of the device during the movement of the conveying device. Meanwhile, the moving parts are immersed in the molten salt solution, which causes a series of problems such as corrosion and lubrication. SUMMARY

[0006] The utility model provides a kind of immersed high temperature furnace slag waste heat recovery device based on molten salt heat storage to solve the problems existing in prior art.

[0007] The utility model discloses a technical scheme is: a kind of immersed high-temperature furnace slag waste heat recovery device based on fused salt heat storage, including recovery device shell, the granule inlet section is provided on the upper end of recovery device shell, high-temperature granule is entered into recovery device shell inner cavity from granule inlet section, the granule outlet section is provided on the lower end of recovery device shell, and high-temperature granule is discharged from granule outlet section after heat exchange, the side wall of recovery device shell is provided with the finned tube bundle of heat exchange.

[0008] Further, the finned tube bundle includes a plurality of heat exchange pipelines, the upper end of the heat exchange pipeline is in communication with the side wall opening of the liquid outlet pipe, and the lower end of the heat exchange pipeline is in communication with the side wall opening of the liquid inlet pipe.

[0009] Further, the liquid outlet pipe is transversely arranged at the upper outer wall of the recovery device shell, the side wall openings at the outer wall of the liquid outlet pipe have consistent diameters, and the diameters are smaller than the inner diameter of the liquid outlet pipe.

[0010] Further, the liquid inlet pipe is transversely arranged at the lower outer wall of the recovery device shell, the side wall openings at the outer wall of the liquid inlet pipe have consistent diameters, and the diameters are smaller than the inner diameter of the liquid inlet pipe.

[0011] Further, the granule outlet section is provided below with a conveyor belt, and the conveyor belt receives the high-temperature granule after heat exchange.

[0012] Further, the heat exchange pipeline includes a first finned tube in a first column and a second finned tube in a second column arranged at the side wall of the recovery device shell, the first finned tubes are equidistantly arranged in the vertical direction, and the second finned tubes are equidistantly arranged in the vertical direction.

[0013] Further, the first finned tube and the second finned tube are sequentially connected in series through a communication pipe to form the heat exchange pipeline.

[0014] Further, the angle between the axis line of the first finned tube and the second finned tube and the upper end of the recovery device shell is an acute angle.

[0015] Further, the inner cavity of the granule inlet section is a gradually increasing cross section with an increasing cross section from top to bottom.

[0016] Further, the inner cavity of the granule outlet section is a gradually decreasing cross section with a decreasing cross section from top to bottom.

[0017] The utility model has the following beneficial effects:

[0018] The utility model uses fused salt as waste heat recovery medium, recovers heat from high-temperature granule through the finned tube arranged in cross in the waste heat recovery device, and the high-temperature granule is accumulated in the device, so that the finned tube is immersed in the high-temperature granule, heat exchange is enhanced, waste heat recovery efficiency is improved, and the problem of possible pollution of the granule by the fused salt is solved.

[0019] The material outlet section adopts a hyperbolic design, cooperates with the conveying device, controls the discharging amount of the material by controlling the speed of the conveying device, maintains the material layer at a certain thickness, ensures that the molten salt heat exchange finned tube is immersed in the material layer of a certain thickness, and finally controls the heat storage amount of the molten salt. BRIEF DESCRIPTION OF DRAWINGS

[0020] Fig. 1 is the overall structure schematic diagram of the utility model;

[0021] Fig. 2 is the structure schematic diagram of the finned tube bundle in the utility model;

[0022] Among them:

[0023] 1 particle inlet section 2 particle outlet section

[0024] 3 recovery device shell 4 finned tube bundle

[0025] 5 conveying belt 6 liquid inlet pipe

[0026] 7 liquid outlet pipe

[0027] 41 first finned tube 42 second finned tube

[0028] 43 third finned tube 44 fourth finned tube

[0029] 45 fifth finned tube 46 sixth finned tube

[0030] 47 seventh finned tube 48 eighth finned tube

[0031] 49 ninth finned tube 410 tenth finned tube. DETAILED DESCRIPTION

[0032] Hereinafter, the utility model is explained in detail with reference to the drawings and examples:

[0033] As Figs. 1-2 shown, an immersed high-temperature furnace slag waste heat recovery device based on molten salt heat storage includes a recovery device shell 3, the recovery device shell 3 upper end is provided with particle inlet section 1, high-temperature particles enter the recovery device shell 3 inner cavity from particle inlet section 1, the recovery device shell 3 lower end is provided with particle outlet section 2, and the high-temperature particles after heat exchange are discharged from particle outlet section 2, the side wall of the recovery device shell 3 is provided with finned tube bundle 4 for heat exchange.

[0034] The finned tube bundle 4 includes a plurality of heat exchange pipelines, the upper end of the heat exchange pipeline is communicated with the side wall opening of liquid outlet pipe 7, and the lower end of the heat exchange pipeline is communicated with the side wall opening of liquid inlet pipe 6.

[0035] The liquid outlet pipe 7 is horizontally arranged on the upper outer wall of the housing 3 of the recovery device. The side wall openings on the outer wall of the liquid outlet pipe 7 have the same diameter and are all smaller than the inner diameter of the liquid outlet pipe 7.

[0036] The liquid inlet pipe 6 is horizontally arranged on the lower outer wall of the housing 3 of the recovery device. The side wall openings on the outer wall of the liquid inlet pipe 6 have the same diameter and are all smaller than the inner diameter of the liquid inlet pipe 6.

[0037] A conveyor belt 5 is provided below the particle outlet section 2, and the conveyor belt 5 receives the particles after heat exchange.

[0038] The heat exchange pipeline includes a first finned tube 41 in the first row and a second finned tube 42 in the second row, which are arranged on the side wall of the housing 3 of the recovery device. The first finned tubes 41 are arranged at equal intervals in the vertical direction, and the second finned tubes 42 are arranged at equal intervals in the vertical direction.

[0039] The first finned tube 41 and the second finned tube 42 are connected in series through a connecting pipe to form a heat exchange pipeline.

[0040] The angle between the line connecting the axes of the first rib tube 41 and the second rib tube 42 and the upper end of the housing 3 of the recycling device is an acute angle.

[0041] The inner cavity of the particle inlet section 1 is an increasing cross section that gradually increases from top to bottom.

[0042] The inner cavity of the particle outlet section 2 is a tapered cross section that gradually decreases in size from top to bottom.

[0043] Specifically, such as Fig. 1 As shown, the upper and lower ends of the housing 3 of the recycling device form outwardly bent plates with through holes. These through holes are used to connect the particle inlet section 1 and the particle outlet section 2, respectively. The particle inlet section 1 and the particle outlet section 2 are connected by corresponding through holes. The devices are fixed using bolts and nuts.

[0044] Specifically, the inner cavity of the particle inlet section 1 is a square gradually increasing cross section, and the inner cavity of the particle outlet section 2 is a strip-shaped gradually decreasing cross section.

[0045] Specifically, a receiving groove is formed on the conveyor belt 5, the outline of which is slightly larger than that of the particle inlet section 1, so as to receive the heat-exchanged particles.

[0046] Specifically, a support frame is provided at the lower end of the recycling device housing 3, the support frame supports the recycling device housing 3, and the conveyor belt 5 is installed in the support frame.

[0047] Specifically, such as Fig. 2As shown, the recycling device housing 3 is formed at the third row of the third finned tube 43, the fourth row of the fourth finned tube 44, the fifth row of the fifth finned tube 45, the sixth row of the sixth finned tube 46, the seventh row of the seventh finned tube 47, the eighth row of the eighth finned tube 48, the ninth row of the ninth finned tube 49, and the tenth row of the tenth finned tube 410.

[0048] Specifically, the side wall of the liquid outlet pipe 7 is provided with five holes to form five liquid outlet openings; and the side wall of the liquid inlet pipe 6 is provided with five holes to form five liquid inlet openings.

[0049] Specifically, the third finned tube 43 and the fourth finned tube 44 are sequentially connected by a communication pipe to form a heat exchange pipe, and are communicated between the liquid outlet pipe 7 and the liquid inlet pipe 6.

[0050] Specifically, the fifth finned tube 45 and the sixth finned tube 46 are sequentially connected by a communication pipe to form a heat exchange pipe, and are communicated between the liquid outlet pipe 7 and the liquid inlet pipe 6.

[0051] Specifically, the seventh finned tube 47 and the eighth finned tube 48 are sequentially connected by a communication pipe to form a heat exchange pipe, and are communicated between the liquid outlet pipe 7 and the liquid inlet pipe 6.

[0052] Specifically, the ninth finned tube 49 and the tenth finned tube 410 are sequentially connected by a communication pipe to form a heat exchange pipe, and are communicated between the liquid outlet pipe 7 and the liquid inlet pipe 6.

[0053] Specifically, the particle inlet section 1 is the entrance of high-temperature particles, and the particle outlet section 2 is the outlet of low-temperature particles that have absorbed heat from the molten salt. The particles passing through the particle outlet section 2 fall onto the conveying belt 5, and the thickness of the material layer is controlled by adjusting the running speed of the conveying belt 5.

[0054] In order to adapt to the movement of the conveying belt 5, the particle inlet section 1 and the particle outlet section 2 are designed in double-curved shapes.

[0055] Specifically, the medium inside the finned tube bundle 4 is a molten salt fluid, and the medium outside the finned tube bundle 4 is high-temperature particles. The finned tube bundle 4 includes a first finned tube 41 in the first row, a second finned tube 42 in the second row, a third finned tube 43 in the third row, a fourth finned tube 44 in the fourth row, a fifth finned tube 45 in the fifth row, a sixth finned tube 46 in the sixth row, a seventh finned tube 47 in the seventh row, an eighth finned tube 48 in the eighth row, a ninth finned tube 49 in the ninth row, a tenth finned tube 410 in the tenth row, a liquid inlet pipe 6, and a liquid outlet pipe 7.

[0056] Specifically, the liquid inlet pipe 6 is arranged at the lowermost layer of the recycling device shell 3, and five liquid inlets are uniformly arranged; the liquid outlet pipe 7 is arranged at the uppermost layer of the recycling device shell 3, and five liquid outlets are uniformly arranged. The pipe diameter of the liquid inlet pipe 6 and the liquid outlet pipe 7 is equal, the diameter of the liquid inlet and the liquid outlet is equal, and the pipe diameter of the liquid inlet pipe 6 and the liquid outlet pipe 7 is greater than the diameter of the liquid inlet and the liquid outlet.

[0057] The working principle of the embodiment is as follows:

[0058] After the high-temperature slag particles cooled by the vertical bed with air as the medium enter the recycling device shell 3 through the particle inlet section 1, the particles are accumulated and maintained at a certain bed thickness in the recycling device shell 3, at the same time, the molten salt fluid flows into the ribbed tube bundle 4 from the liquid inlet pipe 6, exchanges heat with the particles in the recycling device shell 3, and flows out from the liquid outlet pipe 7 after absorbing heat. The low-temperature particles after heat exchange fall onto the conveying belt 5 through the particle outlet section 2 and are taken away, and the thickness of the bed is controlled by adjusting the running speed of the conveying belt 5, so that the molten salt heat exchange ribbed tube is immersed in a bed of a certain thickness, and finally the heat storage amount of the molten salt is controlled.

[0059] The utility model adopts molten salt as the waste heat recovery medium, recovers heat from high-temperature particles through the cross-arranged ribbed tubes of the waste heat recovery device, and the high-temperature particles are accumulated in the device, so that the ribbed tubes are immersed in the high-temperature particles, the heat exchange is enhanced, the waste heat recovery efficiency is improved, and the problem of possible contamination of the particles by the molten salt is solved.

[0060] The material outlet section of the utility model adopts a hyperbolic design, cooperates with the conveying device, controls the discharge amount of the material by controlling the speed of the conveying device, maintains the bed at a certain thickness, ensures that the molten salt heat exchange ribbed tube is immersed in a bed of a certain thickness, and finally controls the heat storage amount of the molten salt.

Claims

1. A molten salt heat storage-based submerged high-temperature slag waste heat recovery device, comprising a recovery device shell (3), characterized in that: The upper end of the recycling device shell (3) is provided with a particle inlet section (1), high-temperature particles enter the inner cavity of the recycling device shell (3) from the particle inlet section (1), the lower end of the recycling device shell (3) is provided with a particle outlet section (2), and the high-temperature particles after heat exchange are discharged from the particle outlet section (2), and the side wall of the recycling device shell (3) is provided with a finned tube bundle (4) for heat exchange.

2. The molten-salt-based heat-accumulating immersed high-temperature slag waste heat recovery device according to claim 1, characterized in that: The finned tube bundle (4) comprises a plurality of heat exchange pipelines, the upper end of the heat exchange pipeline is in communication with the side wall opening of the liquid outlet pipe (7), and the lower end of the heat exchange pipeline is in communication with the side wall opening of the liquid inlet pipe (6).

3. The molten-salt-based heat-accumulating immersed high-temperature slag waste heat recovery device according to claim 2, characterized in that: The liquid outlet pipe (7) is transversely arranged at the upper outer wall of the recycling device shell (3), the side wall openings at the outer wall of the liquid outlet pipe (7) are consistent in diameter and smaller than the inner diameter of the liquid outlet pipe (7).

4. The molten-salt-based heat-accumulating immersed high-temperature slag waste heat recovery device according to claim 2, characterized in that: The liquid inlet pipe (6) is transversely arranged at the lower outer wall of the recycling device shell (3), the side wall openings at the outer wall of the liquid inlet pipe (6) are consistent in diameter and smaller than the inner diameter of the liquid inlet pipe (6).

5. The molten-salt-based heat-accumulating immersed high-temperature slag heat recovery device according to claim 1, characterized in that: The particle outlet section (2) is provided below with a conveying belt (5), and the conveying belt (5) receives the particles after heat exchange.

6. The molten-salt-based heat-accumulating immersed high-temperature slag heat recovery device according to claim 2, characterized in that: The heat exchange pipeline comprises a first finned tube (41) of a first column and a second finned tube (42) of a second column arranged at the side wall of the recycling device shell (3), the first finned tube (41) is arranged at equal intervals in the vertical direction, and the second finned tube (42) is arranged at equal intervals in the vertical direction.

7. The molten-salt-based heat-accumulating immersed high-temperature slag heat recovery device according to claim 6, characterized in that: The first finned tube (41) and the second finned tube (42) are sequentially connected in series through a communication pipe to form a heat exchange pipeline.

8. The molten-salt-based heat-accumulating immersed high-temperature slag heat recovery device according to claim 6, characterized in that: The first finned tube (41) and the second finned tube (42) are arranged at equal intervals in the vertical direction.

9. The molten-salt-based heat-accumulating immersed high-temperature slag heat recovery device according to claim 1, characterized in that: The inner cavity of the particle inlet section (1) is a gradually increasing cross section that gradually increases from top to bottom.

10. The molten-salt-based heat-accumulating immersed high-temperature slag heat recovery device according to claim 1, characterized in that: The inner cavity of the particle outlet section (2) is a gradually decreasing cross section that gradually decreases from top to bottom.

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