Cement kiln waste heat recovery device

Abstract

The utility model discloses a waste heat recovery device of a cement kiln, which belongs to the technical field of waste heat recovery and is technically characterized in that a waste heat recovery sleeve is sleeved outside a kiln body, and a plurality of annular fins are fixedly connected between the inner wall of the waste heat recovery sleeve and the outer wall of the kiln body at intervals along the horizontal direction. The furnace body, the waste heat recovery sleeve and the annular fins are matched to form a plurality of annular cavities, water supply mechanisms in one-to-one correspondence with the annular cavities are arranged at the top of the waste heat recovery sleeve, and a water tank is fixedly connected to the bottom of the waste heat recovery sleeve. Through holes communicating with the annular cavities one by one are formed between the top of the water tank and the bottom of the waste heat recovery sleeve in a penetrating mode. The waste heat recovery device of the cement kiln is simple and compact in structure, heat on the outer wall of the kiln body can be recovered and utilized without repeated heat exchange, the waste heat recovery rate is greatly improved, and energy waste and utilization are avoided.

Description

Technical Field

[0001] This utility model relates to the field of waste heat recovery technology, specifically a waste heat recovery device for cement kilns. Background Technology

[0002] A cement kiln is an important piece of equipment used in cement production. It is the key device that chemically reacts raw materials, limestone and clay, at high temperatures to produce cement clinker. A cement kiln mainly consists of the kiln body, kiln shell, combustion equipment, cooling equipment, and exhaust gas treatment equipment. Among these, the kiln body is the main component.

[0003] Cement kilns generate a large amount of heat during operation. Due to the limited insulation of the kiln body, the temperature of the outer wall of the kiln is relatively high. To avoid heat waste, a waste heat recovery device is needed to recover the waste heat from the outer wall of the kiln. A search revealed a patent with authorization publication number CN110822929A, which discloses a waste heat recovery device for cement kilns. The device includes a kiln body, with a sleeve fitted around its outer side. The kiln body and the sleeve are sealed together, forming an annular cavity filled with heat transfer oil. A water tank is fixedly installed in the center of the top surface of the sleeve. An annular flat micro-heat pipe with an open top is fitted around the outer side of the kiln body, with the inner wall of the annular flat micro-heat pipe in contact with the outer wall of the kiln body. This invention utilizes heat transfer oil within an annular cavity to facilitate heat exchange between the outer wall of the furnace body and an annular flat micro heat pipe. The annular flat micro heat pipe transfers the absorbed heat to the flat micro heat pipe, which in turn transfers the heat to the heat sink. The heat sink then exchanges heat with the water in the tank, thereby producing hot water at a specific temperature. This hot water is then supplied to users or for industrial production, thus achieving the recovery of waste heat from cement kilns and saving energy.

[0004] Regarding the above technical solution, the inventor believes that during use, the heat on the outer wall of the furnace needs to be exchanged sequentially through the annular flat micro heat pipe, the flat micro heat pipe and the heat sink before it can be exchanged with the water in the water tank. In this process, there are too many heat exchange times, resulting in a low waste heat recovery rate, which is not conducive to use. Utility Model Content

[0005] The purpose of this invention is to provide a waste heat recovery device for cement kilns to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A waste heat recovery device for a cement kiln is applied to the kiln body. The kiln body is fitted with a waste heat recovery sleeve. Several annular fins are fixedly connected horizontally between the inner wall of the waste heat recovery sleeve and the outer wall of the kiln body. The kiln body, the waste heat recovery sleeve, and the annular fins cooperate to form several annular cavities. A water supply mechanism corresponding to each annular cavity is provided at the top of the waste heat recovery sleeve. A water tank is fixedly connected to the bottom of the waste heat recovery sleeve. A through hole communicating with each annular cavity is passed through between the top of the water tank and the bottom of the waste heat recovery sleeve.

[0008] As a further embodiment of this utility model: an annular heat-conducting plate sleeved on the outside of the furnace body is fixedly connected inside the waste heat recovery sleeve, and the annular fins are fixed on the outer ring of the annular heat-conducting plate.

[0009] As a further embodiment of this utility model: the water supply mechanism includes a circulation pipe fixed at the bottom of the water tank and communicating with the inner cavity of the water tank, a circulation pump connected to the outer end of the circulation pipe, an L-shaped water delivery pipe connected to the outlet of the circulation pump, and a water supply pipe connected to the water delivery pipe and extending vertically into each annular cavity fixedly connected to the top of the waste heat recovery sleeve.

[0010] As a further embodiment of this utility model: the lower end of the water supply pipe is connected to an arc-shaped spray pipe located above the furnace body, and several nozzles are evenly distributed on the bottom arc surface of the arc-shaped spray pipe.

[0011] As a further embodiment of this utility model: the upper part of the water tank is fixedly connected to an inlet that communicates with the inner cavity of the water tank, and the lower part of the water tank is fixedly connected to an outlet that communicates with the inner cavity of the water tank.

[0012] As a further embodiment of this utility model: the outer surface of the waste heat recovery sleeve is wrapped with a first insulation layer, and the outer surface of the water tank is wrapped with a second insulation layer.

[0013] As a further embodiment of this utility model, the upper end of the through hole is shaped like a trumpet, wider at the top and narrower at the bottom.

[0014] In summary, this utility model has the following beneficial effects:

[0015] This invention, employing the aforementioned structure, utilizes the interplay between the waste heat recovery sleeve, annular fins, water tank, through-hole, water supply mechanism, and annular cavity. During use, the water supply mechanism delivers water to each annular cavity, which then flows sequentially into the water tank via the annular cavity and through-hole. In this process, heat exchange occurs between the furnace exterior wall and the water. Simultaneously, the annular fins expand the heat contact area, enhancing heat exchange and enabling the production of hot water at a specific temperature for user use. This invention features a simple and compact structure, eliminating the need for multiple heat exchanges to recover and utilize heat from the furnace exterior wall, significantly improving waste heat recovery efficiency, preventing energy waste, and promoting efficient energy use. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a waste heat recovery device for cement kilns.

[0017] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle.

[0018] Figure 3 This is a cross-sectional view of a waste heat recovery sleeve in a cement kiln waste heat recovery device.

[0019] In the diagram: 1. Cement kiln; 2. Waste heat recovery sleeve; 3. Annular fins; 4. Water tank; 5. Through hole; 6. Water supply mechanism; 601. Circulation pipe; 602. Circulation pump; 603. Water delivery pipe; 604. Water supply pipe; 605. Arc-shaped spray pipe; 606. Sprayer head; 7. Water inlet; 8. Water outlet; 9. First insulation layer; 10. Second insulation layer; 11. Annular heat-conducting plate; 12. Annular cavity. Detailed Implementation

[0020] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] Example:

[0022] Please see Figure 1-3A waste heat recovery device for a cement kiln is disclosed, applied to the kiln body 1. Due to the limited insulation effect of the kiln body 1, and the generally high temperature of its outer wall, heat recovery is necessary. A waste heat recovery sleeve 2 is fitted over the kiln body 1. The junction between the waste heat recovery sleeve 2 and the kiln body 1 needs to be sealed to prevent water from flowing out through this junction. Several annular fins 3 are fixedly connected horizontally between the inner wall of the waste heat recovery sleeve 2 and the outer wall of the kiln body 1. These fins increase the thermal contact area between the kiln body 1 and the water, thereby improving heat recovery from the outer wall of the kiln body 1. The kiln body 1, the waste heat recovery sleeve 2, and the annular fins 3 together form several annular cavities 12. When water flows through these annular cavities 12, it can comprehensively and evenly recover heat from the outer wall of the kiln body 1. A water supply mechanism 6, corresponding to each annular cavity 12, is provided at the top of the waste heat recovery sleeve 2, enabling water to be supplied to each annular cavity 12. A water tank 4 is fixedly connected to the bottom of the waste heat recovery sleeve 2 for storing the produced hot water. A through hole 5, communicating with each annular cavity 12, runs through the top of the water tank 4 and the bottom of the waste heat recovery sleeve 2. Preferably, the upper end of the through hole 5 is funnel-shaped, wider at the top and narrower at the bottom, to facilitate the entry of water from the annular cavity 12 into the through hole 5. After heat exchange within the annular cavity 12, the water forms hot water at a certain temperature, which flows into the water tank 4 through the through hole 5 for storage and use by the user.

[0023] The waste heat recovery sleeve 2 is fixedly connected to an annular heat-conducting plate 11 that is sleeved outside the furnace body 1. This separates the furnace body 1 from the waste heat recovery sleeve 2, preventing the water in the annular cavity 12 from directly contacting the furnace body 1 and thus avoiding water corrosion of the furnace body 1. The annular fins 3 are fixed on the outer ring of the annular heat-conducting plate 11, so that the annular cavity 12 is set along the outer ring of the annular heat-conducting plate 11. During use, the heat from the outer wall of the furnace body 1 is first transferred to the annular heat-conducting plate 11 and then exchanged with the water.

[0024] Specifically, the water supply mechanism 6 includes a circulation pipe 601 fixed to the bottom of the water tank 4 and communicating with the inner cavity of the water tank 4. A circulation pump 602 is connected to the outer end of the circulation pipe 601, and an L-shaped water delivery pipe 603 is connected to the outlet of the circulation pump 602. A water supply pipe 604, communicating with the water delivery pipe 603 and extending vertically into each annular cavity 12, is fixedly connected to the top of the waste heat recovery sleeve 2. In use, the circulation pump 602 operates, and the water in the water tank 4 is transported to each annular cavity 12 through the cooperation of the circulation pipe 601, the water delivery pipe 603, and the water supply pipe 604. After heat exchange in the annular cavity 12, the water then enters the water tank 4 through the through hole 5. This cycle is repeated to recover heat from the outer wall of the furnace body 1 without consuming a large amount of water resources, while maintaining a relatively high water temperature. Furthermore, the lower end of the water supply pipe 604 is connected to an arc-shaped spray pipe 605 located above the furnace body 1. Several nozzles 606 are evenly distributed on the bottom arc surface of the arc-shaped spray pipe 605. Through the arrangement of the arc-shaped spray pipe 605 and the nozzles 606, the water can flow downward through the front and rear sides of the annular cavity 12, avoiding the water from flowing only from one side and affecting the heat recovery rate.

[0025] In addition, the upper part of the water tank 4 is fixedly connected to a water inlet 7 that communicates with the inner cavity of the water tank 4, which can replenish the water tank 4 with room temperature water; the lower part of the water tank 4 is fixedly connected to a water outlet 8 that communicates with the inner cavity of the water tank 4, and the hot water in the water tank 4 can flow out through the water outlet 8 for the user to use.

[0026] Preferably, the outer surface of the waste heat recovery sleeve 2 is covered with a first insulation layer 9, the outer surface of the water tank 4 is covered with a second insulation layer 10, and the outer surface of the water pipe 603 is covered with a third insulation layer, which can effectively prevent heat loss.

[0027] In use, a certain amount of water is added to the water tank 4 through the inlet 7. When the cement kiln body 1 needs to recover waste heat, the circulation pump 602 works, and the water in the water tank 4 is sprayed into the annular cavity 12 through the circulation pipe 601, water delivery pipe 603, water supply pipe 604, arc-shaped spray pipe 605 and nozzle 606. Then, through the cooperation of the annular fins 3 and the annular heat-conducting plate 11, the heat on the outer wall of the furnace body 1 is exchanged with the water to produce hot water at a certain temperature. Finally, the hot water enters the water tank 4 through the through hole 5. This cycle is repeated to recover the heat on the outer wall of the furnace body 1 and avoid energy waste.

[0028] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A waste heat recovery device for cement kilns, applied to the furnace body (1) of a cement kiln, characterized in that, The furnace body (1) is covered with a waste heat recovery sleeve (2). Several annular fins (3) are fixedly connected horizontally between the inner wall of the waste heat recovery sleeve (2) and the outer wall of the furnace body (1). The furnace body (1), the waste heat recovery sleeve (2) and each annular fin (3) cooperate to form several annular cavities (12). A water supply mechanism (6) corresponding to each annular cavity (12) is provided at the top of the waste heat recovery sleeve (2). A water tank (4) is fixedly connected at the bottom of the waste heat recovery sleeve (2). A through hole (5) communicating with each annular cavity (12) is passed through between the top of the water tank (4) and the bottom of the waste heat recovery sleeve (2).

2. The waste heat recovery device for a cement kiln according to claim 1, characterized in that, The waste heat recovery sleeve (2) is fixedly connected to an annular heat-conducting plate (11) sleeved outside the furnace body (1), and the annular fins (3) are fixed on the outer ring of the annular heat-conducting plate (11).

3. The waste heat recovery device for a cement kiln according to claim 1, characterized in that, The water supply mechanism (6) includes a circulation pipe (601) fixed at the bottom of the water tank (4) and communicating with the inner cavity of the water tank (4). A circulation pump (602) is connected to the outer end of the circulation pipe (601). An L-shaped water supply pipe (603) is connected to the outlet of the circulation pump (602). A water supply pipe (604) is fixedly connected to the top of the waste heat recovery sleeve (2), communicating with the water supply pipe (603) and extending vertically into each annular cavity (12).

4. The waste heat recovery device for a cement kiln according to claim 3, characterized in that, The lower end of the water supply pipe (604) is connected to an arc-shaped spray pipe (605) located above the furnace body (1), and several nozzles (606) are evenly distributed on the bottom arc surface of the arc-shaped spray pipe (605).

5. A cement kiln waste heat recovery device according to claim 1, characterized in that, The upper part of the water tank (4) is fixedly connected to an inlet (7) that communicates with the inner cavity of the water tank (4), and the lower part of the water tank (4) is fixedly connected to an outlet (8) that communicates with the inner cavity of the water tank (4).

6. The waste heat recovery device for a cement kiln according to claim 1, characterized in that, The outer surface of the waste heat recovery sleeve (2) is covered with a first insulation layer (9), and the outer surface of the water tank (4) is covered with a second insulation layer (10).

7. A cement kiln waste heat recovery device according to claim 1, characterized in that, The upper end of the through hole (5) is shaped like a trumpet, wider at the top and narrower at the bottom.

Images