High-temperature solid particle waste heat recovery device

Abstract

The utility model discloses a high-temperature solid particle waste heat recovery device which comprises a heat exchange pipe body with height difference at two ends, and a feeding port is formed or formed in the upper end of the heat exchange pipe body. At least one cold air inlet is formed below the feeding hole; at least one hot air particle outlet is formed between the cold air inlet and the feeding hole; and a large particle discharge hole is formed or formed in the lower end of the heat exchange tube body. Therefore, on the basis of partial heat exchange in advance, the system can effectively divide high-temperature solid particles with different particle sizes into at least two groups of particles with similar particle sizes, then heat exchange is carried out on the particles with similar particle sizes again, and it is basically guaranteed that cooling curves of the particles with different particle sizes meet process requirements; therefore, heat carried by each group of particles with similar particle sizes can be subjected to heat exchange and recovery at the same time, and the utilization efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat recovery, in particular to a high-temperature solid particle waste heat recovery device. Background Art

[0002] The waste heat resources of high energy consumption industries are very rich, including product waste heat, waste gas waste heat and solid waste heat. Among them, product waste heat usually comes from the heat energy generated in the production process, and waste gas waste heat is the heat energy carried by the waste gas discharged during production. These two waste heat resources have been relatively effectively recovered and reused. As for solid waste heat, it mainly refers to the heat energy in solid waste and solid products (such as high-temperature solid particles) generated in high-energy industries. These heat energies usually exist in the form of sensible heat. In order to effectively utilize these heat energies, Chinese patent document CN110906763A discloses a waste heat recovery system based on combined cooling of high-temperature solid particles, which includes a membrane wall heat exchanger, the upper end of the membrane wall heat exchanger is connected to a screw feeder, the lower section is connected to a screw discharger, and one side of the membrane wall heat exchanger is connected to a cold air circulation device through a pipeline, which is used to cool the hot air and send it into the cavity of the membrane wall heat exchanger to achieve circulation; the membrane wall heat exchanger includes a preheating section, an evaporation section and a superheating section. The preheating section preliminarily heats the cold water and sends it to the evaporation section to generate steam, and then enters the superheating section to generate high-temperature and high-pressure steam; wherein, the high-temperature solid particles flow through the screw feeder and are sent into the cavity of the membrane wall heat exchanger. Under the control of the screw feeder at the discharge port, they fully exchange heat with the membrane wall, transfer heat to the water or steam in the membrane wall, and achieve cooling of the high-temperature solid particles. In the above-mentioned documents, although the high-temperature solid particles realize the heat exchange process through the membrane wall heat exchanger, the existing high-temperature solid particles (such as the balls produced in the sintering process) are of different sizes, and the cooling curves of the balls are inconsistent. The balls with small particle sizes cool down quickly, while the balls with large particle sizes cool down slowly, so that the heat carried by the high-temperature solid particles cannot be fully utilized or the utilization efficiency is low. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a high-temperature solid particle waste heat recovery device, which includes a heat exchange tube body with a height difference at both ends, a feed port is formed or provided at the upper end of the heat exchange tube body; at least one cold air inlet is provided below the feed port; at least one hot air particle outlet is provided between the cold air inlet and the feed port; a large particle outlet is formed or provided at the lower end of the heat exchange tube body. The high-temperature solid particles fall from the feed port by their own gravity. During the falling process, the cold air is blown in from the cold air inlet and blows at least part of the high-temperature solid particles from bottom to top to form a fluidized state, especially high-temperature solid particles with small and medium particle sizes, and the high-temperature solid particles with small and medium particle sizes are discharged from the hot air particle outlet. In the above system, the cold air is divided into two parts after entering the heat exchange tube body, one part of which blows or sweeps the high-temperature solid particles from bottom to top along the inside of the heat exchange tube body. In this process, incomplete heat exchange between solid and gas can be achieved. At the same time, the air pressure gradually decreases, and the high-temperature solid particles with small particle size are discharged. Of course, a small part of this part of the cold air continues to flow along the heat exchange tube body to the top of the high-temperature solid particles in the feed port. This small part of the gas must overcome the resistance of the high-temperature solid particles and reach the top of the high-temperature solid particles or a certain height below the top, and the pressure is basically zero or close to zero; while the other part of the cold air blows the remaining large-size high-temperature solid particles downward. At the same time, combined with the action of gravity and inertia, the large particles of high-temperature solid particles flow to the large particle discharge port. Therefore, the above system can effectively divide high-temperature solid particles of different particle sizes into at least two groups of particles with similar particle sizes on the basis of partial heat exchange in advance, and then heat exchange is performed again for particles with similar particle sizes, which basically ensures that the cooling curves of particles of different particle sizes meet the process requirements, so that the heat carried by each group of particles with similar particle sizes can be recovered by heat exchange at the same time, and hot air of different temperatures can be obtained at the same time, thereby improving the utilization efficiency. Of course, in order to achieve effective separation of high-temperature solid particles, during the use of the above system, the high-temperature solid particles must be continuously fed into the feed port to ensure that the high-temperature solid particles are at the top position in the feed port; and the large-sized high-temperature solid particles are discharged through the large-particle discharge port, and the discharged large-sized high-temperature solid particles have basically the same particle size or are within a certain range, and the cooling rate is basically the same, and the specific heat exchange process is not described.

[0004] Specifically, the hot air particle outlet includes at least one high-temperature air particle outlet, and / or at least one medium-temperature air particle outlet; when the high-temperature air particle outlet and the medium-temperature air particle outlet are both set, the high-temperature air particle outlet is higher than the medium-temperature air particle outlet; when the high-temperature air particle outlet is multiple, it is set in the same layer or multiple layers above and below; when the medium-temperature air particle outlet is multiple, it is set in the same layer or multiple layers above and below. Among them, whether it is set in the same layer or multiple layers above and below, it is preferably set evenly. When selecting the upper and lower multi-layer setting, the setting of each layer is preferably set evenly. Of course, whether it is a high-temperature air particle outlet or a medium-temperature air particle outlet, the particle size carried out by the cold wind is basically within a certain particle size range. Of course, it is inevitable that there will be a small proportion of particles outside the above particle size range. Due to the small proportion, it is basically negligible. As for high temperature wind or medium temperature wind, it is mainly named according to the distance from the cold air inlet so that the cold air is obtained through heat exchange.

[0005] When the high-temperature wind particle outlet and the medium-temperature wind particle outlet are set at the same time, the average particle diameter of the particles carried out by the wind through the medium-temperature wind particle outlet is greater than the average diameter of the particles carried out by the wind through the high-temperature wind particle outlet. The specific process is as follows: when the cold wind blows from bottom to top to the medium-temperature wind particle outlet, due to the pressure difference between the inside and outside of the heat exchange tube body, the wind and the particles carried are released from the medium-temperature wind particle outlet; and the wind that continues to blow upward continues to blow the high-temperature solid particles, and when it reaches the high-temperature wind particle outlet, due to the pressure difference between the inside and outside, the wind and the particles carried are released from the high-temperature wind particle outlet. The specific principle is as follows: the cold wind pressure provides buoyancy for the particles to move upward; therefore, by controlling the change in wind pressure, that is, controlling the relationship between the particle gravity mg and the wind pressure F, that is, the relationship between the particle size and the wind pressure, particles in different size ranges are discharged from the air outlets at corresponding heights; and the control of wind pressure is related to the initial wind pressure and the mass of the added particles; by adjusting the initial wind pressure and the mass (volume flow rate) of the added particles, the change in wind pressure meets the requirements, so that the medium-temperature wind particle outlet is basically medium-sized high-temperature solid particles; of course, it is not ruled out that a small amount of small-sized particles are not able to leave in time at the medium-temperature wind particle outlet and are entrained and discharged through the medium-temperature wind particle outlet, but the amount is very small; and the high-temperature solid particles at the high-temperature wind particle outlet are basically small-sized particles, and are discharged through the high-temperature wind particle outlet; of course, it is not ruled out that a small amount of medium-sized or even large-sized particles are entrained due to gravity, but the amount is very small.

[0006] In one embodiment, when there are multiple cold air inlets, they are arranged in the same layer or in multiple layers up and down. Wherein, whether arranged in the same layer or in multiple layers up and down, it is preferred to arrange them uniformly. When multiple layers up and down are selected, the arrangement of each layer is preferably uniform.

[0007] In one embodiment, the cold air inlet is arranged to be inclined upward. With this arrangement, after the cold air enters the heat exchange tube body, most of the cold air is blown upward from bottom to top, and a small part is blown downward from top to bottom. This allows most of the cold air to blow upward or sweep away high-temperature solid particles, thereby improving the utilization rate of the cold air.

[0008] In one embodiment, it also includes a recovery bin arranged outside the heat exchange tube body, a hot air outlet is arranged at the top of the recovery bin, a discharge port is arranged at the bottom of the recovery bin, an inlet is arranged on the side wall between the hot air outlet and the discharge port, and the recovery bin is connected to the hot air particle outlet through a feed pipe, and the inner diameter of the recovery bin is larger than the inner diameter of the feed pipe. At this time, the wind pressure is reduced, the wind speed is reduced, and the wind flow carrying force is weakened, so that the particles fall into the recovery bin by themselves, and the wind flows through the hot air outlet to leave the recovery bin and perform the next heat exchange action. By setting up the recovery bin, it is connected to the high-temperature wind particle outlet and / or the medium-temperature wind particle outlet, and then, the particles carried by the wind fall into the recovery bin.

[0009] Furthermore, a cooling air inlet is provided on the side wall of the recovery bin, and the height of the cooling air inlet in the vertical direction is lower than the feed inlet. By providing the cooling air inlet, further heat exchange is performed with the particles falling into the recovery bin, so that the heat of the solid particles in this part is fully utilized as much as possible, and the cooling air after heat exchange is combined with the air flow carrying the particles. And the discharge temperature of the hot air can be more accurately controlled by adjusting the flow rate of the cooling air.

[0010] Furthermore, a wind grille is provided at the hot air outlet.

[0011] In one embodiment, the high-temperature wind particle outlet is connected to the first recovery bin through a first conveying pipe, and the medium-temperature wind particle outlet is connected to the second recovery bin through a second conveying pipe.

[0012] In one embodiment, the large particle discharge port is connected to a large particle discharge pipe body. The setting of the large particle discharge pipe body is not specifically limited, and a horizontal pipe or an inclined pipe setting is preferred, and a horizontal pipe is preferred. When large-diameter high-temperature solid particles flow toward the particle discharge port, large-diameter high-temperature solid particles enter the large-particle discharge pipe body until the air pressure of this part of the cold wind at a certain position of the large particle discharge pipe body becomes smaller and smaller, preferably zero or close to zero, at which time the discharge is more gentle, and this position can be set as the outlet position of large-diameter high-temperature solid particles. However, at the outlet position of the large particle discharge pipe body, large-diameter high-temperature solid particles must be continuously discharged on the basis of ensuring that the cold wind is basically not exhausted at the outlet position, and the two maintain a balance.

[0013] In one embodiment, the feed port is a funnel-mouth structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the specific implementation modes of the present invention, the following is a brief introduction to the drawings required for use in the specific implementation modes. Obviously, the drawings described below are some implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0015] Figure 1 It is a structural schematic diagram of a high-temperature solid particle waste heat recovery device of the utility model;

[0016] The reference numerals in the figure are as follows: 1-heat exchange tube body; 2-feed port; 3-cold air inlet; 4-high-temperature air particle outlet; 5-medium-temperature air particle outlet; 6-first recovery bin; 7-first hot air outlet; 8-first cooling air inlet; 9-second recovery bin; 10-second hot air outlet; 11-second cooling air inlet; 12-large particle discharge tube body; 13-first conveying pipe; 14-second conveying pipe. DETAILED DESCRIPTION

[0017] The following is a clear and complete description of the contents of the utility model in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, but not all of the embodiments. The embodiments in the utility model and other embodiments obtained by ordinary technicians in this field without creative work are all within the scope of protection of the utility model.

[0018] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0019] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0021] Example 1

[0022] like Figure 1 As shown, the present embodiment discloses a high-temperature solid particle waste heat recovery device, which includes a heat exchange tube body 1 with a height difference at both ends. The setting of the heat exchange tube body 1 is not specifically limited, and it can be vertically set or inclined, preferably vertically set. Its shape is not specifically limited, and it can be a straight tube or a curved tube, as long as it can ensure that the high-temperature solid can fall by its own gravity. In this embodiment, a round tube is preferred; a feed port 2 is formed or provided at the upper end of the heat exchange tube body 1, and preferably, the feed port 2 is in the shape of a funnel mouth; a feed port 2 is provided below the feed port 2. At least one cold air inlet 3. When there are multiple cold air inlets 3, they are arranged on the same layer or in multiple layers. In the present embodiment, there is one cold air inlet 3; at least one hot air particle outlet is arranged between the cold air inlet 3 and the feed port 2; a large particle discharge port (not shown in the figure) is formed or provided at the lower end of the heat exchange tube body 1, and the large particle discharge port is connected to a large particle discharge tube body 12, and the large particle discharge tube body 12 is arranged horizontally, or the large particle discharge tube body 12 is arranged at a downward inclination angle to the horizontal plane, for example, the angle between the two is 15 degrees. As for the shape of the large particle discharge tube body 12, there is no specific limitation. Like the shape of the heat exchange tube body 1, a round tube is preferably used. Of course, it is more preferred that the large particle discharge tube body 12 is arranged vertically to the heat exchange tube body.

[0023] In one embodiment, the hot air particle outlet includes at least one high temperature air particle outlet 4, and / or at least one medium temperature air particle outlet 5; when both the high temperature air particle outlet 4 and the medium temperature air particle outlet 5 are provided, the high temperature air particle outlet 4 is higher than the medium temperature air particle outlet 5; when there are multiple high temperature air particle outlets 5, they are provided in the same layer or in multiple layers above and below; when there are multiple medium temperature air particle outlets 5, they are provided in the same layer or in multiple layers above and below. When the upper and lower layers are selected, it is preferred that the outlets in the same layer are evenly provided.

[0024] In this embodiment, the hot air particle outlet includes a high-temperature air particle outlet 4 and a medium-temperature air particle outlet 5 .

[0025] In one embodiment, it also includes a recovery bin arranged outside the heat exchange tube body 1, a hot air outlet is arranged at the top of the recovery bin, a discharge port is arranged at the bottom of the recovery bin, an inlet is arranged on the side wall between the hot air outlet and the discharge port, and is connected to the hot air particle outlet through a feed pipe, and the inner diameter of the recovery bin is larger than the inner diameter of the feed pipe. Further, a cooling air inlet is arranged on the side wall of the recovery bin, and the height of the cooling air inlet in the vertical direction is lower than the inlet. Further, a wind grille is arranged at the hot air outlet.

[0026] In this embodiment, the high-temperature wind particle outlet 4 and the medium-temperature wind particle outlet 5 correspond to the first recovery bin 6 and the second recovery bin 9, respectively. Among them, the first recovery bin 6 is provided with a first hot air outlet 7 at the top and a first discharge port (not shown in the figure) at the bottom. Of course, the first discharge port can be connected to auxiliary equipment, such as a pipeline, etc. The first recovery bin 6 is provided with a first feed port (not shown in the figure) on the side wall between the first hot air outlet 7 and the first discharge port, and is connected to the high-temperature wind particle outlet 4 through a first conveying pipe 13. The inner diameter of the first recovery bin 6 is larger than the inner diameter of the first conveying pipe 13. The side wall of the first recovery bin 6 is provided with a first cooling air inlet 8. The first cooling air inlet 8 is lower than the first feed port in the vertical direction. The first hot air outlet 7 is provided with a first wind grid (not shown in the figure); The second recovery bin 9 is provided with a second hot air outlet 10 on the upper part and a second discharge port (not shown in the figure) on the bottom. Of course, the second discharge port can be connected to auxiliary equipment, such as a pipeline, etc. The second recovery bin 9 is provided with a second feed inlet (not shown in the figure) on the side wall between the second hot air outlet 10 and the second discharge port, and is connected to the medium-temperature air particle outlet 5 through a second feed pipe 14. The inner diameter of the second recovery bin 9 is larger than the inner diameter of the second feed pipe 14. The side wall of the second recovery bin 9 is provided with a second cooling air inlet 11. The second cooling air inlet 11 is lower in vertical height than the second feed inlet. A second wind grid (not shown in the figure) is provided at the second hot air outlet 7.

[0027] In one embodiment, the cold air inlet 3 is arranged to be inclined upward.

[0028] As for other structures, such as fans and connecting pipes, they will not be described one by one again.

[0029] As for high-temperature solid particles, there is no specific restriction. They mainly refer to solid waste and solid products generated in high-energy industries. Specifically, high-temperature solid particles with a particle size within a certain range are selected. In particular, solid waste needs to be processed accordingly according to system requirements. Specifically, solid product particles are ferrite pellets, ceramic particles, steel slag, etc. As for the gas used for cooling or heat exchange, the gas does not react with the high-temperature solid particles and will not decompose when exchanging heat with the high-temperature solid particles.

[0030] This embodiment is specifically described by taking ferrite balls with a particle size range of 1-40mm as an example, and the details are as follows: the above-mentioned ferrite balls are loaded from the feed port until the ferrite balls reach a preset position or above the preset position at the feed port; then, 11Kpa cold air is input from the cold air inlet to the heat exchange tube body, and the cold air inlet is inclined upward, so that most of the cold air blows from bottom to top, and a small part blows from top to bottom. Among them, large-particle (15-40mm) ferrite balls gradually fall into the large-particle discharge tube body which is horizontally arranged and has a straight length of at least 3m due to gravity and a small part of the cold air blowing from top to bottom, and combined with inertia and blowing, the large-particle ferrite balls are continuously discharged from the outlet position of the large-particle discharge tube body; and the cold air from bottom to top As it flows upward, its wind pressure becomes lower and lower. The medium-temperature wind particle outlet is set 1m above the cold wind inlet, where the wind pressure drops to 5Kpa. At this time, medium-sized high-temperature solid particles with a particle size range of 8-17mm are discharged from the medium-temperature wind particle outlet with the wind, and fall into the second recovery bin by gravity at the second recovery bin, and can continue to exchange heat through the second cooling wind; the high-temperature wind particle outlet is set 1.5m above the cold wind inlet, where the wind pressure drops to 2Kpa. At this time, small-sized high-temperature solid particles with a particle size less than 12mm are discharged from the high-temperature wind particle outlet with the wind, and fall into the first recovery bin by gravity at the first recovery bin, and can continue to exchange heat through the first cooling wind. It should be noted that as the large-particle ferrite balls are discharged, the height of the ferrite balls at the feed port decreases. In order to ensure that the cold air is not discharged from the top of the ferrite balls, it is necessary to continuously input the ferrite balls to maintain the preset position of the top of the ferrite balls.

[0031] Obviously, there are overlapping particle sizes between medium particles and small particles, but this is understandable and acceptable. As mentioned in the content, a small amount of small particles are taken out at the medium temperature wind particle outlet 5. Of course, a small amount of medium particles will also be taken out at the high temperature wind small particle outlet 4. Obviously, the particle size at the outlet set in the utility model is a range. Although the embodiment only sets two upper and lower outlets, it can be understood that small particles are produced in one area of ​​the heat exchange tube body 1, and medium particles are produced in one area. Therefore, multiple layers can be set, and of course, multiple layers can be set in one layer. At this time, the particles can be divided more finely, or particles in a certain area can be obtained.

[0032] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A high-temperature solid particle waste heat recovery device, characterized in that: It includes a heat exchange tube body with a height difference at both ends, wherein a feed port is formed or provided at the upper end of the heat exchange tube body; at least one cold air inlet is provided below the feed port; at least one hot air particle outlet is provided between the cold air inlet and the feed port; and a large particle outlet is formed or provided at the lower end of the heat exchange tube body.

2. The high-temperature solid particle waste heat recovery device according to claim 1 is characterized in that: The hot air particle outlet includes at least one high-temperature air particle outlet, and / or at least one medium-temperature air particle outlet; when both the high-temperature air particle outlet and the medium-temperature air particle outlet are set, the high-temperature air particle outlet is higher than the medium-temperature air particle outlet; when there are multiple high-temperature air particle outlets, they are set on the same layer or in multiple layers above and below; when there are multiple medium-temperature air particle outlets, they are set on the same layer or in multiple layers above and below.

3. The high-temperature solid particle waste heat recovery device according to claim 1 or 2, characterized in that: When there are multiple cold air inlets, they are arranged on the same layer or in multiple layers above and below.

4. The high-temperature solid particle waste heat recovery device according to claim 1, characterized in that: It also includes a recovery bin arranged outside the heat exchange tube body, a hot air outlet is provided at the top of the recovery bin, a discharge port is provided at the bottom of the recovery bin, an inlet is provided on the side wall between the hot air outlet and the discharge port, and the recovery bin is connected to the hot air particle outlet via a feed pipe, and the inner diameter of the recovery bin is larger than the inner diameter of the feed pipe.

5. The high-temperature solid particle waste heat recovery device according to claim 4 is characterized in that: A cooling air inlet is provided on the side wall of the recovery bin, and the height of the cooling air inlet in the vertical direction is lower than the feed inlet.

6. The high-temperature solid particle waste heat recovery device according to claim 4 or 5, characterized in that: A wind grille is provided at the hot air outlet.

7. The high-temperature solid particle waste heat recovery device according to claim 1, characterized in that: The large particle discharging port is connected with a large particle discharging pipe body.

8. The high-temperature solid particle waste heat recovery device according to claim 1, characterized in that: The feed inlet is a funnel-mouth structure.

9. The high-temperature solid particle waste heat recovery device according to claim 1, characterized in that: The cold air inlet is arranged inclined upward.

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