阅读说明：本技术 竖冷窑及矿料冷却与余热回收方法 (Vertical cooling kiln and mineral aggregate cooling and waste heat recovery method ) 是由 梁长林 杨亮 杜慧卿 陈冲 刘保平 王伟 石小旭 于 2019-12-06 设计创作，主要内容包括：本发明涉及烧结矿冷却装置技术领域,尤其是涉及一种竖冷窑及矿料冷却与余热回收方法。竖冷窑,包括窑体,窑体的底部为冷却风供风腔室,窑体的顶部为热风集中腔室,冷却风供风腔室与热风集中腔室之间设置有至少一个冷却单元腔室；冷却风供风腔室用于向冷却单元腔室提供冷却风,热风集中腔室用于与热风外送通道连通；内环供风装置用于使冷却风从冷却单元腔室的中心流向四周；外环供风装置的外环进风口与冷却风供风腔室连通,外环供风装置用于使冷却风从冷却单元腔室的四周流向中心。本发明能够提高向冷却单元腔室内供风的均匀性,实现了矿料的均匀冷却,提高了余热回收效率。(The invention relates to the technical field of sinter cooling devices, in particular to a vertical cooling kiln and a method for cooling ore materials and recovering waste heat. The vertical cooling kiln comprises a kiln body, wherein a cooling air supply chamber is arranged at the bottom of the kiln body, a hot air concentration chamber is arranged at the top of the kiln body, and at least one cooling unit chamber is arranged between the cooling air supply chamber and the hot air concentration chamber; the cooling air supply chamber is used for supplying cooling air to the cooling unit chamber, and the hot air concentration chamber is used for being communicated with the hot air delivery channel; the inner ring air supply device is used for enabling cooling air to flow to the periphery from the center of the cooling unit cavity; and an outer ring air inlet of the outer ring air supply device is communicated with the cooling air supply cavity, and the outer ring air supply device is used for enabling cooling air to flow to the center from the periphery of the cooling unit cavity. The invention can improve the uniformity of air supply into the cooling unit cavity, realize the uniform cooling of mineral aggregate and improve the waste heat recovery efficiency.)

1. A vertical cooling kiln, comprising:

the kiln comprises a kiln body, wherein a cooling air supply chamber is arranged at the bottom of the kiln body, a hot air concentration chamber is arranged at the top of the kiln body, at least one cooling unit chamber is arranged between the cooling air supply chamber and the hot air concentration chamber, and the cooling unit chamber is used for being communicated with a material receiving port of a discharging machine; the cooling air supply cavity is used for supplying cooling air to the cooling unit cavity, and the hot air concentration cavity is used for being communicated with the hot air delivery channel;

an inner ring air inlet of the inner ring air supply device is communicated with the cooling air supply chamber, and an inner ring air outlet of the inner ring air supply device is communicated with the cooling unit chamber and used for enabling the cooling air to flow to the periphery from the center of the cooling unit chamber;

an outer ring air supply device, wherein an outer ring air inlet of the outer ring air supply device is communicated with the cooling air supply chamber, an outer ring air outlet of the outer ring air supply device is communicated with the cooling unit chamber, and a height difference is formed between the outer ring air outlet and the inner ring air outlet; the outer ring air supply device is used for enabling the cooling air to flow to the center from the periphery of the cooling unit cavity.

2. The vertical cooling kiln as recited in claim 1, wherein the cooling air supply chamber is provided with a cone hopper, the end with the larger inner diameter of the cone hopper is communicated with the cooling unit chamber, and the end with the smaller inner diameter of the cone hopper is used for being communicated with a material receiving port of the discharging machine;

the inner ring air supply device is arranged in the cone hopper and comprises an air supply beam and an air supply cap, the air supply beam is fixedly connected with the cone hopper, an air inlet channel is arranged in the air supply beam, the inner ring air inlet is communicated with the air inlet channel, the air supply cap is arranged above the air supply beam, the inner ring air outlet is arranged on the air supply cap, and the inner ring air outlet faces to the bottom of the cone hopper;

the outer ring air supply device is arranged on the wall of the cone hopper, an outer ring air inlet of the outer ring air supply device is communicated with the cooling air supply chamber, and an outer ring air outlet of the outer ring air supply device faces the bottom of the cone hopper.

3. The vertical cooling kiln according to claim 2, wherein the air supply cap is tapered, and a center line of the air supply cap coincides with a center line of the cone.

4. The vertical cooling kiln as recited in claim 2, wherein the number of the air supply beams is two, the two air supply beams are crossed and communicated, and both ends of each air supply beam are provided with inner ring air inlets.

5. The vertical cold kiln according to any of claims 1 to 4, wherein said hot air concentration chamber is provided with a distributor for distributing hot mineral material inside said cooling unit chamber.

6. The vertical cooling kiln according to claim 5, wherein the number of the blanking ports of the distributor is plural.

7. The vertical cooling kiln according to any one of claims 1 to 4, wherein the number of the cooling unit chambers is plural, and a first partition plate is provided between adjacent two of the cooling unit chambers.

8. The vertical cooling kiln according to claim 7, wherein the cooling air supply chamber is provided with a second partition plate corresponding to the first partition plate in position, the second partition plate partitioning the cooling air supply chamber into a plurality of independent air supply chambers, the independent air supply chambers corresponding to the cooling unit chambers one to one.

9. The vertical cooling kiln according to claim 8, wherein a plurality of the independent air supply chambers are respectively provided for communication with a main duct of an air supply device through a branch duct provided with a regulating valve.

10. The vertical cooling kiln according to any one of claims 1 to 4, characterized in that the side wall of the kiln body comprises a metal layer and a brick wall layer, the metal layer is positioned outside the brick wall layer, the metal layer is fixedly connected with the brick wall layer, and the wall surface of the brick wall layer is concave-convex.

11. A method for mineral aggregate cooling and waste heat recovery, characterized in that it is carried out with a vertical kiln according to any one of claims 1 to 10, comprising the following steps:

filling the cooling unit chamber with mineral material;

supplying cooling air to the cooling unit chamber;

when the number of the cooling unit chambers is one, continuously discharging or intermittently discharging the mineral aggregate in the cooling unit chambers; when the number of the cooling unit chambers is multiple, mineral aggregates in the multiple cooling unit chambers are discharged in turn.

Technical Field

The invention relates to the technical field of sinter cooling devices, in particular to a vertical cooling kiln and a method for cooling ore materials and recovering waste heat.

Background

A cooling process for vertical kiln of sinter ore features that the hot-broken sinter ore is continuously (or intermittently at a certain rhythm) loaded in a sealed vertical container (kiln chamber) for cooling and the cold ore is continuously (or intermittently at a certain rhythm) discharged from the bottom of kiln chamber.

The sintered mineral aggregate entering the kiln chamber is filled to a specific height of the kiln chamber (determined by a distributor structure) in a natural accumulation state, and when the mineral aggregate is continuously (or intermittently at a certain rhythm) discharged from the bottom of the kiln chamber, the mineral aggregate in the kiln chamber flows downwards from top to bottom under the action of self weight to fill a mineral aggregate cavity formed by bottom discharge; in the flowing process, the cooling medium (cooling air) fed into the kiln chamber from the lower part of the kiln chamber penetrates through the gaps (or pores) of the sintered ore materials from bottom to top to flow, and performs countercurrent heat exchange with the sintered ore.

The sintering mineral aggregate flows from top to bottom in the vertical cooling kiln chamber, namely the heat exchange and cooling process of the hot sintering mineral and the medium; the heat exchange process needs to realize two aims, one is that the temperature of the sintered ore is reduced below the set temperature after cooling and heat exchange (generally 120-150 ℃ is taken as the limit in industrial production); secondly, the temperature of the hot air after heat exchange is raised to be higher than a certain temperature, for example, the temperature of the hot air sent to the waste heat boiler for steam production is generally required to reach 320-350 ℃, the boiler can stably produce steam, and the higher the temperature of the hot air is, the higher the quality (temperature and pressure) of the produced steam is, and the higher the utilization efficiency is.

The existing vertical cooling kiln has the phenomenon of uneven air supply, the drift phenomenon easily occurs in the cooling process, the contact time of cooling air and mineral aggregate is inconsistent, the mineral aggregate cannot be uniformly cooled, and for the mineral aggregate with short contact time of the cooling air, the insufficient waste heat recovery is discharged, so that the waste heat recovery efficiency is low.

Disclosure of Invention

The invention aims to provide a vertical cooling kiln to solve the technical problem of uneven air supply in the prior art.

The second objective of the present invention is to provide a method for cooling mineral aggregate and recovering waste heat, so as to alleviate the technical problems of the prior art that mineral aggregate cannot be cooled uniformly and the recovery efficiency of waste heat is low due to uneven air supply.

Based on the above object, the present invention provides a vertical cooling kiln, comprising:

the kiln comprises a kiln body, wherein a cooling air supply chamber is arranged at the bottom of the kiln body, a hot air concentration chamber is arranged at the top of the kiln body, at least one cooling unit chamber is arranged between the cooling air supply chamber and the hot air concentration chamber, and the cooling unit chamber is used for being communicated with a material receiving port of a discharging machine; the cooling air supply cavity is used for supplying cooling air to the cooling unit cavity, and the hot air concentration cavity is used for being communicated with the hot air delivery channel;

an inner ring air inlet of the inner ring air supply device is communicated with the cooling air supply chamber, and an inner ring air outlet of the inner ring air supply device is communicated with the cooling unit chamber and used for enabling the cooling air to flow to the periphery from the center of the cooling unit chamber;

an outer ring air supply device, wherein an outer ring air inlet of the outer ring air supply device is communicated with the cooling air supply chamber, an outer ring air outlet of the outer ring air supply device is communicated with the cooling unit chamber, and a height difference is formed between the outer ring air outlet and the inner ring air outlet; the outer ring air supply device is used for enabling the cooling air to flow to the center from the periphery of the cooling unit cavity.

Further, in some embodiments, the cooling air supply chamber is provided with a conical hopper, one end with a large inner diameter of the conical hopper is communicated with the cooling unit chamber, and one end with a small inner diameter of the conical hopper is used for being communicated with a material receiving port of the discharging machine;

the inner ring air supply device is arranged in the cone hopper and comprises an air supply beam and an air supply cap, the air supply beam is fixedly connected with the cone hopper, an air inlet channel is arranged in the air supply beam, the inner ring air inlet is communicated with the air inlet channel, the air supply cap is arranged above the air supply beam, the inner ring air outlet is arranged on the air supply cap, and the inner ring air outlet faces to the bottom of the cone hopper;

the outer ring air supply device is arranged on the wall of the cone hopper, an outer ring air inlet of the outer ring air supply device is communicated with the cooling air supply chamber, and an outer ring air outlet of the outer ring air supply device faces the bottom of the cone hopper.

Further, in some embodiments, the funnel cap is tapered, and a centerline of the funnel cap coincides with a centerline of the cone.

Further, in some embodiments, the number of the air supply beams is two, the two air supply beams are vertically crossed and communicated, and two ends of each air supply beam are provided with inner ring air inlets.

Further, in some embodiments, the hot air concentration chamber is provided with a distributor for distributing hot mineral material inside the cooling unit chamber.

Further, in some embodiments, the number of the blanking ports of the distributor is multiple.

Further, in some embodiments, the number of the cooling unit chambers is multiple, and a first partition plate is disposed between two adjacent cooling unit chambers.

Further, in some embodiments, the cooling air supply chamber is provided with a second partition plate, the position of the second partition plate corresponds to the position of the first partition plate, the second partition plate divides the cooling air supply chamber into a plurality of independent air supply chambers, and the independent air supply chambers correspond to the cooling unit chambers one to one.

Further, in some embodiments, a plurality of the independent air supply chambers are respectively used for communicating with a main pipeline of the air supply device through branch pipelines, and the branch pipelines are provided with regulating valves.

Further, in some embodiments, the side wall of the kiln body comprises a metal layer and a brick wall layer, the metal layer is located outside the brick wall layer, the metal layer is fixedly connected with the brick wall layer, and the wall surface of the brick wall layer is concave-convex.

Further, in some embodiments, the outer wall and the top plate of the hot air concentration chamber are heat-insulating wall structures.

Based on the second purpose, the invention provides a mineral aggregate cooling and waste heat recovery method, which is carried out by adopting the vertical cooling kiln, and comprises the following steps:

filling the cooling unit chamber with mineral material;

supplying cooling air to the cooling unit chamber;

when the number of the cooling unit chambers is one, continuously discharging or intermittently discharging the mineral aggregate in the cooling unit chambers; when the number of the cooling unit chambers is multiple, mineral aggregates in the multiple cooling unit chambers are discharged in turn.

Compared with the prior art, the invention has the beneficial effects that:

the vertical cooling kiln and the mineral aggregate cooling and waste heat recovery method provided by the invention can improve the uniformity of air supply into the cooling unit cavity, realize uniform cooling of mineral aggregates and improve the waste heat recovery efficiency. When the cooling unit is used, mineral aggregate is filled in the cavity of the cooling unit, cooling air is introduced into the inner ring air inlet of the inner ring air supply device and the outer ring air inlet of the outer ring air supply device, the cooling air passes through the inner ring air outlet of the inner ring air supply device and flows around from the center of the cavity of the cooling unit to form inner ring air, the cooling air passes through the outer ring air outlet of the outer ring air supply device and flows around from the center of the cavity of the cooling unit to form outer ring air, meanwhile, because the height difference is formed between the outer ring air outlet and the inner ring air outlet, the air flow flowing out of the inner ring air outlet and the air flow flowing out of the outer ring air outlet are guaranteed not to interfere with each other, so that the inner ring air and the outer ring air form a. Because the cooling air supply cavity is positioned below the cooling unit cavity, the hot air concentration cavity is positioned above the cooling unit cavity, and the cooling air is continuously supplied to the cooling unit cavity, the countercurrent heat exchange between the cooling air and mineral aggregate is realized, the low-temperature mineral aggregate after heat release is discharged from the cooling unit cavity, the high-temperature medium after heat absorption enters the hot air concentration cavity and is sent to a place needing waste heat through a hot air delivery channel, for example, the high-temperature medium is sent to a waste heat boiler to produce steam and be utilized, and therefore the purpose of full and efficient recovery of the waste heat is realized.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic structural diagram of a vertical cooling kiln according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view taken along line M-M of FIG. 1;

FIG. 3 is a schematic structural diagram of an inner ring air supply device of a vertical kiln according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of an outer ring air supply device of a vertical kiln according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of the matching of the inner ring air supply device and the outer ring air supply device in the cooling unit cavity of the vertical cooling kiln according to the embodiment of the present invention.

Icon: 100-a discharging machine; 200-a conveyor belt; 101-a kiln body; 102-an air supply chamber; 103-hot air concentration chamber; 104-hot air delivery channel; 105-a first separator; 106-a distributor; 107-material sliding pipe; 108-receiving buffer bin; 109-cone hopper; 110-a discharge pipe; 111-a first chamber; 112-a second chamber; 113-a third chamber; 114-a fourth chamber; 115-a blast cap; 116-an annular channel; 117-inner ring air inlet; 118-inner ring air outlet; 119-an outer ring air inlet; 120-outer ring air outlet; 121-a first air supply beam; 122-a second air supply beam; 123-a second separator; 124-concrete platform; 125-heat preservation type wall structure.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.