Device for recycling heat of high-temperature gas to preheat sand

Abstract

The utility model discloses a device for preheating sand by recovering heat of high-temperature gas, which relates to the field of waste heat recovery and comprises a first preheating cover and a second preheating cover, a collecting hopper is fixedly mounted on the outer side of the bottom of the first preheating cover, and a gas inlet cover is fixedly mounted at the bottom of the first preheating cover and located on the inner side of the collecting hopper. An exhaust hood is fixedly mounted at the top of the second preheating hood, a sand inlet pipe penetrates through the outside of the exhaust hood, and dispersion structures are arranged in the first preheating hood and the second preheating hood. According to the device for recycling the heat of the high-temperature gas to preheat the sand, the sand is preheated through high-temperature tail gas before being heated, on one hand, waste heat in the high-temperature tail gas is utilized, the utilization rate is higher, on the other hand, in the later heating process of the preheated sand, the energy supply amount can be greatly reduced, energy consumption is reduced, and the production cost is reduced. And the practicability is higher.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of waste heat recovery, especially relates to a device for recycling high-temperature gas heat to preheat sand. BACKGROUND

[0002] In the recycling of waste sand, casting, metallurgy and other industries, high-temperature gas (such as furnace gas, flue gas, etc.) is usually directly discharged, resulting in energy waste and environmental pollution.

[0003] In the prior art, although there are some gas recovery devices, the efficiency is low, and the high-temperature gas cannot be effectively utilized, so the sand cannot be preheated. On the one hand, the discharged high-temperature gas cannot be utilized, and on the other hand, a large amount of energy is required for subsequent heating of the sand, resulting in high cost. UTILITY MODEL CONTENTS

[0004] The main purpose of the utility model is to provide a device for recycling high-temperature gas heat to preheat sand, which can effectively solve the technical problem of low efficiency and ineffective utilization of high-temperature gas in the prior art.

[0005] To achieve the above-mentioned purpose, the technical scheme adopted by the utility model is as follows:

[0006] A device for recycling high-temperature gas heat to preheat sand, comprising a first preheating cover and a second preheating cover, a collecting hopper is fixedly installed on the outer side of the bottom of the first preheating cover, and an air inlet cover is fixedly installed on the inner side of the bottom of the first preheating cover, an air outlet cover is fixedly installed on the top of the second preheating cover, an air inlet pipe penetrates through the outside of the air outlet cover, and a dispersion structure is arranged in the first preheating cover and the second preheating cover.

[0007] As a further scheme of the utility model, first and second heat insulation layers are fixedly installed on the inner walls of the first and second preheating covers, and the thickness of the second heat insulation layer is three times that of the first heat insulation layer.

[0008] As a further scheme of the utility model, flange plates are fixedly installed at both ends of the first and second preheating covers, and reinforcing rib plates are fixedly connected between the flange plates and the first and second preheating covers, and the first and second preheating covers are communicated through the flange plates on opposite sides.

[0009] As a further scheme of the utility model, the dispersion structure comprises an ear seat and a bottom ring, the ear seat is fixedly installed in the second heat insulation layer, and the bottom ring is fixedly connected with the ear seat through bolts, a stand is fixedly installed on the upper part of the bottom ring, and a top disc is fixedly installed on the top of the stand.

[0010] As a further scheme of the present utility model, the center position of the bottom ring is hollow, and the diameter of the top disc is the same as the diameter of the hollow space.

[0011] As a further scheme of the present utility model, the first preheating cover and the second preheating cover are both provided with two groups of dispersion structures.

[0012] The present utility model has the following beneficial effects:

[0013] By setting the whole preheating sand device, the sand material is preheated by high-temperature tail gas before heating, on the one hand, the waste heat in the high-temperature tail gas is utilized, and the utilization rate is higher, on the other hand, the preheated sand material can greatly reduce the energy supply amount in the later heating process, reduce energy consumption, and the practicality is higher.

[0014] By setting the dispersion structure, the sand material can be dispersed and the discharging speed can be slowed down in the first preheating cover and the second preheating cover, on the one hand, the dispersion effect makes the preheating more uniform, on the other hand, the slowed down discharging speed can increase the heat exchange time, so that the heat exchange efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a whole structure schematic view of the present utility model a device for preheating sand by recycling high-temperature gas heat.

[0016] Figure 2 It is a first preheating cover sectional view of the present utility model a device for preheating sand by recycling high-temperature gas heat.

[0017] Figure 3 It is a working demonstration view of the present utility model a device for preheating sand by recycling high-temperature gas heat.

[0018] In the drawing: 1, first preheating cover; 2, second preheating cover; 3, collecting hopper; 4, air inlet cover; 5, air outlet cover; 6, sand inlet pipe; 7, flange plate; 8, reinforcing rib plate; 9, first heat preservation layer; 10, second heat preservation layer; 11, dispersion structure; 12, ear seat; 13, bottom ring; 14, stand column; 15, top disc. DETAILED DESCRIPTION

[0019] The technical scheme in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model, obviously, the described embodiments are only part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present utility model.

[0020] Embodiment one

[0021] Combined with Figures 1-3The utility model provides a device of recycling high temperature gas heat preheats sand, including first preheating cover 1 and second preheating cover 2, the bottom outside fixed mounting of first preheating cover 1 has collection hopper 3, and the bottom of first preheating cover 1 is located the inside fixed mounting of collection hopper 3 has air inlet cover 4, the top of second preheating cover 2 is fixedly installed with exhaust cover 5, and the outside of exhaust cover 5 is penetrated with sand inlet pipe 6, and the inside of first preheating cover 1 and second preheating cover 2 is equipped with dispersion structure 11.

[0022] Refer to Figure 1 And Figure 2 Further, the inner walls of the first preheating cover 1 and the second preheating cover 2 are fixedly installed with a first heat preservation layer 9 and a second heat preservation layer 10, the thickness of the second heat preservation layer 10 is three times the thickness of the first heat preservation layer 9, the two ends of the first preheating cover 1 and the second preheating cover 2 are fixedly installed with flanges 7, and the flanges 7 are fixedly connected with the first preheating cover 1 and the second preheating cover 2 through the reinforcing rib plates 8, and the first preheating cover 1 and the second preheating cover 2 are communicated through the flanges 7 on the opposite sides.

[0023] Specifically, by connecting the first preheating cover 1 and the second preheating cover 2, the entire preheating stroke is increased, so that the preheating time is more sufficient, and the upflowing sand and the lower air inlet are adopted, so that the gas and the sand have a counter-attack effect, and the heat exchange efficiency is higher.

[0024] Example two

[0025] Refer to Figure 2 And on the basis of example one, further, the dispersion structure 11 includes an ear seat 12 and a bottom ring 13, the ear seat 12 is fixedly installed in the inside of the second heat preservation layer 10, and the bottom ring 13 is fixedly connected with the ear seat 12 through bolts, the upper part of the bottom ring 13 is fixedly installed with a stand 14, the top of the stand 14 is fixedly installed with a top disc 15, the center position of the bottom ring 13 is hollow, and the diameter of the top disc 15 is the same as that of the hollow space, and the inside of the first preheating cover 1 and the second preheating cover 2 is provided with two groups of dispersion structures 11.

[0026] Specifically, when the sand falls, it will be blocked by the top disc 15, and then fall into the bottom ring 13 through the top of the top disc 15, and then fall into the next top disc 15 from the center of the bottom ring 13 as the accumulation becomes more and more, so as to slow down the falling speed of the sand, increase the heat exchange time of the sand, and further improve the heat exchange efficiency.

[0027] As Figure 3It needs to be explained that the utility model discloses a device for recycling high-temperature gas heat to preheat sand, which is used in the following manner: the air inlet cover 4 is connected to an external gas discharge port, the air outlet cover 5 is connected to a tail gas treatment device, the sand inlet pipe 6 is connected to an external sand pipe, the collecting hopper 3 is connected to a sand collecting device, and during operation, hot air enters the interior of the first preheating cover 1 through the air inlet cover 4, sand enters the top disc 15 at the top layer through the sand inlet pipe 6, and is discharged from the outer wall of the air inlet cover 4 after sequentially passing through each bottom ring 13, and in the process, heat exchange occurs between the hot air and the sand, so that the sand is preheated.

[0028] The basic principle and main features of the utility model and the advantages of the utility model are shown and described above. It should be understood by those skilled in the art that the utility model is not limited by the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only used to illustrate the principle of the utility model. Without departing from the spirit and scope of the utility model, various changes and improvements can be made to the utility model, and these changes and improvements all fall within the scope of the utility model claimed.

Claims

1. A device for recovering heat from a high-temperature gas to preheat sand, comprising a first preheating hood (1) and a second preheating hood (2), characterized in that: The bottom outer side of the first preheating cover (1) is fixedly provided with a collecting hopper (3), and the bottom of the first preheating cover (1) is fixedly provided with an air inlet cover (4) inside the collecting hopper (3), the top of the second preheating cover (2) is fixedly provided with an air outlet cover (5), the air outlet cover (5) is penetrated by a sand inlet pipe (6), and the interiors of the first preheating cover (1) and the second preheating cover (2) are both provided with a dispersion structure (11).

2. A device for recovering heat from a high temperature gas to preheat sand according to claim 1, characterized in that: The inner walls of the first preheating cover (1) and the second preheating cover (2) are both fixedly provided with a first heat preservation layer (9) and a second heat preservation layer (10), and the thickness of the second heat preservation layer (10) is three times that of the first heat preservation layer (9).

3. A device for recovering heat from a high temperature gas to preheat sand according to claim 1, characterized in that: The two ends of the first preheating cover (1) and the second preheating cover (2) are both fixedly provided with flange plates (7), and the flange plates (7) and the first preheating cover (1) and the second preheating cover (2) are both fixedly connected with reinforcing rib plates (8), and the first preheating cover (1) and the second preheating cover (2) are communicated through the flange plates (7) on opposite sides.

4. A device for recovering heat from a high temperature gas to preheat sand according to claim 2, characterized in that: The dispersion structure (11) comprises an ear seat (12) and a bottom ring (13), the ear seat (12) is fixedly provided inside the second heat preservation layer (10), and the bottom ring (13) is fixedly connected with the ear seat (12) through bolts, the upper portion of the bottom ring (13) is fixedly provided with a stand column (14), and the top of the stand column (14) is fixedly provided with a top disc (15).

5. A device for recovering heat from a high temperature gas to preheat sand according to claim 4, characterized in that: The center of the bottom ring (13) is hollow, and the diameter of the top disc (15) is the same as that of the hollow space.

6. A device for recovering heat from a high temperature gas to preheat sand according to claim 1, characterized in that: The interiors of the first preheating cover (1) and the second preheating cover (2) are both provided with two groups of dispersion structures (11).

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