阅读说明：本技术 一种多拱桥石灰竖窑 (Multi-arch bridge lime shaft kiln ) 是由 赵久玲 于 2021-10-18 设计创作，主要内容包括：本发明公开了一种多拱桥石灰竖窑,包括竖窑主体,所述竖窑主体的顶端安装有料仓,所述料仓的顶端安装有上料斗,所述竖窑主体的内腔顶端安装有排烟梁,所述竖窑主体的内腔顶端安装有焙烧拱,所述竖窑主体的内腔中心位置安装有热风排出拱,所述竖窑主体的内腔底端安装有冷却风进入拱。该多拱桥石灰竖窑,采用带有多拱分料梁新型竖窑的窑型,被分解的原料置于窑内空间,竖窑的内两墙之间由多层分料拱相连,竖窑结构简单,可行成多个“室”环形组合,同时采用燃烧和传热过程分别独立方式,且窑内采用多拱结构和窑内冷却带采用沸腾冷却方式,使原料粒度适用范围大(粒级比2.5),产品质量好(酌减＜5%)、窑利用系数高(1.25),节能环保。(The invention discloses a multi-arch bridge lime shaft kiln, which comprises a shaft kiln main body, wherein a stock bin is installed at the top end of the shaft kiln main body, a feeding hopper is installed at the top end of the stock bin, a smoke exhaust beam is installed at the top end of an inner cavity of the shaft kiln main body, a roasting arch is installed at the top end of the inner cavity of the shaft kiln main body, a hot air exhaust arch is installed at the center position of the inner cavity of the shaft kiln main body, and a cooling air inlet arch is installed at the bottom end of the inner cavity of the shaft kiln main body. The multi-arch bridge lime shaft kiln adopts a kiln type with a novel shaft kiln with multi-arch material distributing beams, decomposed raw materials are placed in the kiln, the inner two walls of the shaft kiln are connected through a plurality of layers of material distributing arches, the shaft kiln is simple in structure and can form a plurality of 'chamber' annular combinations, the combustion and heat transfer processes are respectively independent, the multi-arch structure and the in-kiln cooling zone are adopted in the kiln, the boiling cooling mode is adopted, the raw material granularity application range is large (the grain size ratio is 2.5), the product quality is good (the grain size is reduced by less than 5%), the kiln utilization coefficient is high (1.25), and the kiln is energy-saving and environment-friendly.)

1. The utility model provides a many hunch bridge lime shaft kiln, includes shaft kiln main part (1), its characterized in that: the top end of the shaft kiln main body (1) is provided with a stock bin (2), the top end of the stock bin (2) is provided with a feeding hopper (3), the top end of the inner cavity of the shaft kiln main body (1) is provided with a smoke exhaust beam (4), the top end of the inner cavity of the shaft kiln main body (1) is provided with a roasting arch (5), the roasting arch (5) is positioned at the bottom end of the smoke exhaust beam (4), the center position of the inner cavity of the shaft kiln main body (1) is provided with a hot air exhaust arch (6), the bottom end of the inner cavity of the shaft kiln main body (1) is provided with a cooling air inlet arch (7), the bottom end of the inner cavity of the shaft kiln main body (1) is provided with an ash discharge hopper (10), the ash discharge hopper (10) is positioned at the bottom end of the cooling air inlet arch (7), the bottom end of the ash discharge hopper (10) is provided with an ash discharge machine (11), the bottom end of the ash discharge transition hopper (11) is provided with a discharge hopper, and the right side of the outer wall of the shaft kiln main body (1) is provided with a combustion chamber (8), and the combustion chamber (8) is connected with the roasting arch (5), and the right side of the outer wall of the combustion chamber (8) is provided with a burner (9).

2. The multi-arch bridge lime shaft kiln of claim 1, wherein: the combustion chamber (8) is arranged at one end of the roasting arch (5), and the fuel of the combustion chamber can be gas fuel, liquid fuel, gas-liquid mixed fuel or powdery solid fuel.

3. The multi-arch bridge lime shaft kiln of claim 1, wherein: the roasting arch (5) and the hot air discharging arch (6) are built by refractory materials, and the cold air inlet arch (7) is formed by welding steel plates and is arched.

4. The multi-arch bridge lime shaft kiln of claim 1, wherein: and a kiln top sealing structure (13) is arranged at the upper part of the shaft kiln main body (1).

5. The multi-arch bridge lime shaft kiln of claim 1, wherein: the outlet of the smoke exhaust beam (4) is connected with an external smoke dust remover through a pipeline, the outlet of the smoke dust remover is connected with a smoke exhauster, and a chimney is arranged behind the smoke exhauster.

6. The multi-arch bridge lime shaft kiln as set forth in claim 2, wherein: the preheating zone, the calcining zone, the transition zone and the cooling zone are formed by building the smoke exhaust beam (4), the calcining arch (5), the hot air exhaust arch (6) and the cooling air inlet arch (7) with refractory materials.

7. A multi-arch bridge lime shaft kiln, which adopts the lime shaft kiln of any one of claims 1 to 6, and is characterized by comprising the following steps:

step 1, uniformly distributing materials into a kiln, sequentially entering a preheating zone, a calcining zone, a transition zone and a cooling zone, and discharging the materials from the bottom of the kiln after cooling;

and 2, in the kiln, ambient air enters a cooling zone of the shaft kiln body through a cold air supply arch of the cooling zone by a high-pressure fan, the cold air exchanges heat with a hot finished product entering a preheating zone, the hot finished product is cooled and heated, the heated air is discharged into an external combustion chamber through a hot air discharge arch of the cooling zone to serve as combustion-supporting air of fuel, a combustion product after the fuel is completely combusted enters the kiln through a roasting arch, the combustion product sequentially exchanges heat with materials in a calcining zone and the preheating zone to calcine and preheat the materials, and smoke is discharged from a smoke discharge device at the top of the kiln.

Technical Field

The invention relates to the technical field of calcite limestone sintering shaft kilns, in particular to a multi-arch bridge lime shaft kiln.

Background

By taking the solution of the stone limestone as an example, the raw material for producing the metallurgical lime is the fine crystal limestone at present, and the method is characterized in that the granularity cannot be changed due to heating in the whole roasting process, the storage capacity of the limestone is continuously reduced due to the expansion of the production scale of steel, even the situation of short supply occurs, and some steel enterprises even use the inferior limestone with high silicon content, so that the difficulty is brought to the production of steel; how to solve this problem has become an urgent problem to be solved at present or even in the future.

The nature contains a lot of marbles and calcite limestone, and the calcium oxide of the limestone is high; the silica content is low, but the limestone is high-quality limestone required in ferrous metallurgy production in terms of chemical indexes, but the limestone is easy to be broken into powder in the roasting process and seriously influences the gas flow and distribution in the roasting kiln, and the raw materials cannot be used in the current roasting kiln. The raw material can be roasted, so that the selectivity of the lime roasting raw material can be greatly increased, and favorable conditions are created for metallurgical production; therefore, the development of a calcite limestone sintering shaft kiln becomes a new problem to be solved urgently.

Disclosure of Invention

The invention aims to provide a multi-arch bridge lime shaft kiln to solve the problems of yield, quality, energy consumption and environmental protection of products produced in the roasting industries of decomposed stone limestone, marble limestone and the like in the prior art.

In a first aspect, the present invention provides a multi-arch bridge lime shaft kiln comprising:

in order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a many hunches bridge lime shaft kiln, includes the shaft kiln main part, the feed bin is installed on the top of shaft kiln main part, the feeding funnel is installed on the top of feed bin, the roof beam of discharging fume is installed on the inner chamber top of shaft kiln main part, the calcination is installed on the inner chamber top of shaft kiln main part and is encircleed, and the calcination encircles the bottom that is located the roof beam of discharging fume, the inner chamber central point of shaft kiln main part puts and installs hot-blast discharge and encircles, the cooling air entering arch is installed to the inner chamber bottom of shaft kiln main part, the ash bucket is installed to the inner chamber bottom of shaft kiln main part, and goes out the ash bucket and be located there is the cooling air entering bottom that encircles, the ash machine is installed out to the bottom that goes out the ash bucket, go out the bottom of ash machine and install ejection of compact transition fill, the combustion chamber is installed on the outer wall right side of shaft kiln main part, and the combustion chamber encircles with the calcination and be connected, the combustor is installed on the outer wall right side of combustion chamber.

Preferably, the combustion chamber is arranged at one end of the roasting arch, and the fuel of the combustion chamber can be gas fuel, liquid fuel, gas-liquid mixed fuel or powdery solid fuel.

Preferably, the roasting arch and the hot air discharge arch are built by refractory materials, and the cold air inlet arch is formed by welding steel plates and is in an arch shape.

Preferably, the upper part of the shaft kiln main body is provided with a kiln top sealing structure.

Preferably, the outlet of the smoke exhaust beam is connected with an external smoke dust remover through a pipeline, the outlet of the smoke dust remover is connected with a smoke exhauster, and a chimney is arranged behind the smoke exhauster.

Preferably, the preheating zone, the calcining zone, the transition zone and the cooling zone are formed by building the smoke exhaust beam, the calcining arch, the hot air exhaust arch and the cooling air inlet arch with refractory materials

In a second aspect, the invention provides a method for a multi-arch bridge lime shaft kiln, which comprises the following steps:

the method comprises the following steps of uniformly distributing materials into a kiln, sequentially entering a preheating zone, a calcining zone, a transition zone and a cooling zone, discharging the cooled materials from the bottom of the kiln, allowing ambient air to enter the cooling zone of a shaft kiln body through a cold air inlet arch of the cooling zone by a high-pressure fan, performing heat exchange between the cold air and a roasted finished product entering the preheating zone, cooling the roasted product, heating the air, discharging the heated air into an external combustion chamber through a hot air outlet arch of the cooling zone to serve as combustion-supporting air of fuel, allowing a combustion product after the fuel is completely combusted to enter the kiln through a calcining arch, sequentially performing heat exchange with the materials in the calcining zone and the preheating zone, roasting and preheating the materials, and discharging smoke from a smoke discharge device at the top of the kiln.

Compared with the prior art, the invention has the beneficial effects that: the lime shaft kiln with the multiple arch bridges is characterized in that a kiln type with a novel shaft kiln with multiple arch distributing beams is adopted, decomposed raw materials are placed in the kiln, the inner two walls of the shaft kiln are connected through multiple layers of distributing arches, the shaft kiln is simple in structure, 50-80 tons of monomers per day can form a plurality of chamber annular combinations, baking arches are used for separating lump powder and providing favorable conditions for high-temperature airflow entering the kiln and uniform distribution of heat load, materials in the kiln are heated uniformly, gas flow is smooth, a cooling zone arch is used for enabling gas distribution to be uniform and playing a role in boiling cooling, meanwhile, a combustion and heat transfer process are respectively independent, the multiple arch structures and a cooling zone in the kiln are adopted for boiling cooling, the application range of the granularity of the raw materials is large (the granularity is 2.5), the product quality is good (the reduction is less than 5%), the utilization coefficient of the kiln is high (1.25), and the lime shaft kiln is energy-saving and environment-friendly.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic right sectional view of the shaft kiln body of FIG. 1.

In the figure: 1. the vertical kiln comprises a vertical kiln main body, 2, a storage bin, 3, a feeding hopper, 4, a smoke exhaust beam, 5, a roasting arch, 6, a hot air exhaust arch, 7, a cooling air inlet arch, 8, a combustion chamber, 9, a combustor, 10, an ash discharge hopper, 11, an ash discharge machine, 12, a discharge transition hopper, 13 and a sealing structure.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.

Referring to fig. 1-2, the present invention provides a multi-arch bridge lime shaft kiln technical scheme: a multi-arch bridge lime shaft kiln comprises a shaft kiln main body 1, a stock bin 2 is arranged at the top end of the shaft kiln main body 1, a feeding hopper 3 is arranged at the top end of the stock bin 2, a smoke discharging beam 4 is arranged at the top end of an inner cavity of the shaft kiln main body 1, a roasting arch 5 is arranged at the top end of the inner cavity of the shaft kiln main body 1, the roasting arch 5 is positioned at the bottom end of the smoke exhaust beam 4, the hot air exhaust arch 6 is arranged at the center of the inner cavity of the shaft kiln main body 1, the cooling air inlet arch 7 is arranged at the bottom end of the inner cavity of the shaft kiln main body 1, the ash outlet hopper 10 is arranged at the bottom end of the inner cavity of the shaft kiln main body 1, the ash discharging hopper 10 is positioned at the bottom end of the cooling air inlet arch 7, the ash discharging machine 11 is arranged at the bottom end of the ash discharging hopper 10, the discharging transition hopper is arranged at the bottom end of the ash discharging machine 11, the combustion chamber 8 is arranged at the right side of the outer wall of the shaft kiln main body 1, and the combustion chamber 8 is connected with the roasting arch 5, and the right side of the outer wall of the combustion chamber 8 is provided with a burner 9.

Preferably, the combustion chamber 8 is disposed at one end of the roasting arch 5, and the fuel thereof may be gas fuel, liquid fuel, gas-liquid mixed fuel or powdery solid fuel.

Preferably, the roasting arch 5 and the hot air discharging arch 6 are constructed of refractory materials, and the cold air intake arch 7 is formed by welding steel plates and has an arch shape.

Preferably, a kiln top sealing structure 13 is arranged at the upper part of the shaft kiln main body 1.

As the preferred scheme, the outlet of the smoke exhaust beam 4 is connected with an external smoke dust remover through a pipeline, the outlet of the smoke dust remover is connected with a smoke exhauster, and a chimney is arranged behind the smoke exhauster.

Preferably, a preheating zone, a calcining zone, a transition zone and a cooling zone are formed by building a smoke exhaust beam 4, a calcining arch 5, a hot air discharging arch 6 and a cooling air inlet arch 7 by adding refractory materials.

The detailed connection means is a technique known in the art, and the following mainly describes the working principle and process, and the specific operation is as follows.

Example 1

The embodiment provides a multi-arch bridge lime shaft kiln, which is based on the method and combines the practical application case of the shaft kiln,

firstly, materials can enter an inner cavity of a shaft kiln main body 1 through a feeding hopper 3 and a storage bin 2, a material-free area is formed at the lower part of an arch due to natural stacking angles of the materials, so that gas entering the kiln has a sufficient inlet channel, conditions are created for uniform distribution of gas media in the kiln, the flow of the shaft kiln is divided into two parts, namely the materials and gas in the kiln, firstly, the solid materials are added from the top of the shaft kiln and then are discharged from the bottom of the kiln through a material storage belt, a preheating belt, a roasting belt, a transition belt, a cooling belt, an ash discharging machine 11 and a discharging transition hopper 12.

And step two, simultaneously, ambient air enters a cooling zone of the shaft kiln through a cooling air inlet arch 7 of the cooling zone by a high-pressure fan, cold air exchanges heat with a hot finished product entering the cooling zone, the hot finished product is cooled, air is heated, the heated air is discharged into a combustion chamber 8 through a hot air outlet arch 6 of the cooling zone to be used as combustion-supporting air of fuel, a combustion product after the fuel is completely combusted enters the kiln through a roasting arch 5 to exchange heat with materials, the gas passes through the roasting zone and a preheating zone in sequence and is discharged out of the kiln through a smoke discharge beam 4, the temperature of the discharged smoke is generally 200-250 ℃, and the smoke is discharged into the atmosphere after reaching the standard through a bag type dust remover under the action of a smoke exhauster.

Example 2

The embodiment provides a multi-arch bridge lime shaft kiln, the method based on the method is combined with the practical application case of the shaft kiln,

firstly, because the fuel is completely combusted in the shaft kiln, and the high temperature point of the fuel is not in the shaft kiln when the fuel is combusted, the shaft kiln has no local high temperature point, the materials in the shaft kiln are uniformly heated, the temperature of a roasting zone can be controlled, the overburning and the underburning of the products are reduced, the activity of the products is improved, the service life of the shaft kiln is prolonged, the hot finished products entering a cooling zone are boiled and cooled by cold air blown into the shaft kiln, the heat brought out by the hot finished products is recovered to the maximum extent, and the hot air is used for supporting combustion of the fuel combustion, so that the heat consumption of the products is reduced.

And step two, the gas entering the preheating zone exchanges heat with the material again to preheat the material, the exhaust gas temperature is reduced, fuel is saved, a bag type dust collector is matched to enable the dust content of the exhaust gas to meet the national dust removal requirement, and an exhaust beam is arranged on the top of the vertical kiln to ensure that the gas distribution in the vertical kiln is uniform so that the gas distribution is in an adjustable state.

The detailed connection means is a technique known in the art, and the following mainly describes the working principle and process, and the specific operation is as follows.

In conclusion, the multi-arch bridge lime shaft kiln provided by the invention has the following advantages:

1. effectively recovering the waste heat of the product, reducing the heat consumption of the unit product and greatly improving the product quality.

2. The raw material range of the sintered lime production is enlarged, the mining amount of high-quality limestone is reduced, and the problem of insufficient raw materials for lime production in the steel production is solved.

In the description of the present invention, it is to be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "one side", "top", "inner", "front", "center", "two ends", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated; also, unless expressly stated or limited otherwise, the terms "snap" or "coupling" or "snap" or "set" or "mount" are to be construed broadly, e.g., as a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; the terms may be directly connected or indirectly connected through an intermediate, and may be communication between two elements or interaction relationship between two elements, unless otherwise specifically limited, and the specific meaning of the terms in the present invention will be understood by those skilled in the art according to specific situations.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.