阅读说明：本技术 一种竖窑式铁矿粉生产烧结矿的方法 (Method for producing sintered ore from shaft kiln type iron ore powder ) 是由 刘德训 张大成 黄建国 牛月旭 娄玉政 于 2020-12-31 设计创作，主要内容包括：本发明公开了一种竖窑式铁矿粉生产烧结矿的方法,包括以下步骤：1)铁矿粉造球：含有铁矿粉的生产用物料配入燃料、熔剂后混合,然后加水造球形成球形铁矿；2)生产烧结矿：将球形铁矿通过竖窑烧结机设有的供料系统加入上部的受料槽内,球形铁矿在烧结系统内被热废气烘干、预热、内部燃料燃烧,形成烧结矿；3)烧结矿破碎冷却：烧结矿落到破碎冷却系统内,进风冷却系统通过设有的冷风口向竖窑烧结机内吹送冷风冷却烧结矿；4)烧结矿排料运输：冷却后的烧结矿落到下部的排料系统上,排料系统将烧结矿排到运输系统上运送到整理系统；5)通风流程；本发明漏风减少,点火能耗减少,烧结矿质量提高,固体燃耗降低,设备作业率升高。(The invention discloses a method for producing sintered ore by shaft kiln type iron ore powder, which comprises the following steps: 1) pelletizing iron ore powder: mixing the production material containing iron ore powder with fuel and flux, and adding water to pelletize into spherical iron ore; 2) producing sintered ore: adding the spherical iron ore into a receiving groove at the upper part through a feeding system arranged in a shaft kiln sintering machine, and drying, preheating and burning internal fuel in the sintering system by hot waste gas to form sintered ore; 3) and (3) crushing and cooling sintered ore: the sintered ore falls into the crushing and cooling system, and the air inlet cooling system blows cold air into the shaft kiln sintering machine through a cold air port arranged to cool the sintered ore; 4) discharging and transporting sintered ore: the cooled sintered ore falls onto a discharge system at the lower part, and the discharge system discharges the sintered ore onto a transportation system and conveys the sintered ore to a finishing system; 5) a ventilation process; the invention reduces air leakage, ignition energy consumption, sinter quality, solid fuel consumption and equipment operation rate.)

1. A method for producing sintered ore by shaft kiln type iron ore powder is characterized by comprising the following steps:

1) pelletizing iron ore powder: mixing the production material containing iron ore powder with fuel and flux, and adding water to pelletize into spherical iron ore;

2) producing sintered ore: adding the spherical iron ore into a receiving groove at the upper part through a feeding system arranged in a shaft kiln sintering machine, then dropping the spherical iron ore into a sintering system connected to the lower part of the receiving groove, and drying, preheating and burning internal fuel in the sintering system by hot waste gas to form sintered ore;

3) and (3) crushing and cooling sintered ore: the method comprises the following steps that (1) sinter falls into a crushing and cooling system connected with the lower part of a sintering system, the sinter is crushed through a toothed roller arranged in the crushing and cooling system, the crushed sinter falls into an air inlet cooling system connected with the lower part of the crushing and cooling system, and the air inlet cooling system blows cold air into a vertical kiln sintering machine through a cold air port arranged to cool the sinter;

4) discharging and transporting sintered ore: the cooled sintered ore falls onto a discharge system at the lower part, and the discharge system discharges the sintered ore onto a transportation system and conveys the sintered ore to a finishing system;

5) and (3) ventilation flow: the sintering system is connected with a plurality of shaft kiln sintering machines through an air exhaust pipeline, the air exhaust pipeline exhausts air through an installed waste heat recovery system, negative pressure is formed in a sintering system cavity, cold air enters an air inlet cooling system from a cold air port to exchange heat with descending sintering ores under the action of the negative pressure, the temperature is increased, and hot air is formed; the temperature of the hot air entering the crushing and cooling system is further raised to form high-temperature air; high-temperature air enters a sintering system, the high-temperature air and fuel in the material are combusted at a combustion zone of the sintering system, the material forms sinter, the high-temperature air is converted into high-temperature waste gas, the high-temperature waste gas rises to transfer heat to the upper material, and the temperature of the high-temperature waste gas is reduced to form low-temperature waste gas; the low-temperature waste gas enters a waste heat recovery system through an air suction pipeline to recover waste heat of the waste gas, and the low-temperature waste gas can be sent back to an air inlet cooling system through a fan to be recycled.

2. The method for producing sintered ore from shaft kiln type iron ore powder as claimed in claim 1, wherein the shaft kiln sintering machine in step 2 is of a vertically connected cylinder type structure and is connected with a plurality of shaft kiln sintering machines from left to right, a material receiving groove is arranged at the upper part of the shaft kiln sintering machine, the periphery of the lower part of the material receiving groove is connected to the upper part of the sintering system through a sealing cover, the lower part of the sintering system is connected to the upper part of a crushing cooling system, the lower part of the crushing cooling system is connected to the upper part of an air inlet cooling system, the lower part of the air inlet cooling system is connected with a discharging system, and a conveying system.

3. The method for producing the sintered ore by the shaft kiln type iron ore powder as claimed in claim 2, wherein a ventilation opening is arranged outside the sintering system, a first filter plate is arranged at the ventilation opening and used for blocking materials in the sintering system, the ventilation opening is connected to a ventilation pipeline through a ventilation pipe, an exhaust valve is arranged on the ventilation pipeline, the ventilation pipeline is connected with a waste heat recovery system, and an exhaust fan is arranged in the waste heat recovery system and used for extracting waste heat gas in the sintering system.

4. The method for producing the sintered ore by the shaft kiln type iron ore powder as claimed in claim 2, wherein a combustion zone is arranged at the lower part in the sintering system for burning the materials at the combustion zone through fuel to form the sintered ore, and a heat insulation layer is arranged at the periphery of the sintering system and at the combustion zone and is made of refractory materials.

5. The method for producing sintered ore from shaft kiln type iron ore powder as claimed in claim 2, wherein a plurality of toothed rollers are installed at the upper part of the crushing and cooling system for crushing the sintered ore formed by the sintering system by dropping the sintered ore onto the toothed rollers, and an ignition hole is formed at one side of the crushing and cooling system for entering and exiting the ignition device.

6. The method for producing the sintered ore from the shaft kiln type iron ore powder as claimed in claim 2, wherein a cold air port is provided outside the air inlet cooling system for introducing cold air, and a second filter plate is installed at the cold air port.

7. The method for producing sintered ore from shaft kiln type iron ore powder as claimed in claim 2, wherein a plurality of temperature thermocouples are installed outside the shaft kiln sintering machine for monitoring the temperature outside the shaft kiln sintering machine to judge the sintering process.

8. The method for producing sintered ore from shaft kiln type iron ore powder according to claim 2, wherein the lower inclination angle of the inner wall of the crushing cooling system is less than 90 ° for forming a trumpet shape with a small upper part and a large lower part.

Technical Field

The invention relates to the technical field of sintering machines, in particular to a method for producing sintered ore by shaft kiln type iron ore powder.

Background

At present, iron ore powder pelletizing mainly comprises a pelletizing process and a sintering process, wherein the sintering process is an air draft belt type sintering machine, namely, iron-containing materials are mixed with fuel and a flux and then subjected to mixing, water adding, pelletizing and other processes, then the materials are distributed on a trolley of the sintering machine through a distribution system, then the materials are ignited through an ignition furnace and subjected to air draft combustion, the materials form a liquid phase, the materials are agglomerated to form sintered ores, and then the sintered ores are distributed to a blast furnace for use through crushing, cooling and a whole grain sieve. However, air leakage exists among sintering trolleys, a slide way, a machine head, a machine tail and the like adopted by the existing induced draft strand sintering machine, and coal gas is continuously used for ignition in the production process, so that energy waste is caused. The belt sintering machine has the function of automatic heat continuation, the sintering temperature of the upper part of the material layer is low, the sintering temperature of the lower part is high, the sintering quality is reduced due to the fact that the sintered mineral content is uneven up and down, the operation rate of the equipment is low, and the cost is high. Therefore, a method for producing sintered ore by shaft kiln type iron ore powder needs to be designed to solve the problems of air leakage, energy waste caused by uninterrupted ignition, low sintering quality and low equipment operation rate of the existing belt type sintering machine.

Disclosure of Invention

Aiming at the problems in the prior art, the invention aims to provide a method for producing sintered ore by shaft kiln type iron ore powder.

The technical scheme adopted by the invention for solving the technical problems is as follows: a method for producing sintered ore by shaft kiln type iron ore powder comprises the following steps:

1) pelletizing iron ore powder: mixing the production material containing iron ore powder with fuel and flux, and adding water to pelletize into spherical iron ore;

2) producing sintered ore: adding the spherical iron ore into a receiving groove at the upper part through a feeding system arranged in a shaft kiln sintering machine, then dropping the spherical iron ore into a sintering system connected to the lower part of the receiving groove, and drying, preheating and burning internal fuel in the sintering system by hot waste gas to form sintered ore;

3) and (3) crushing and cooling sintered ore: the method comprises the following steps that (1) sinter falls into a crushing and cooling system connected with the lower part of a sintering system, the sinter is crushed through a toothed roller arranged in the crushing and cooling system, the crushed sinter falls into an air inlet cooling system connected with the lower part of the crushing and cooling system, and the air inlet cooling system blows cold air into a vertical kiln sintering machine through a cold air port arranged to cool the sinter;

4) discharging and transporting sintered ore: the cooled sintered ore falls onto a discharge system at the lower part, and the discharge system discharges the sintered ore onto a transportation system and conveys the sintered ore to a finishing system;

5) and (3) ventilation flow: the sintering system is connected with a plurality of shaft kiln sintering machines through an air exhaust pipeline, the air exhaust pipeline exhausts air through an installed waste heat recovery system, negative pressure is formed in a sintering system cavity, cold air enters an air inlet cooling system from a cold air port to exchange heat with descending sintering ores under the action of the negative pressure, the temperature is increased, and hot air is formed; the temperature of the hot air entering the crushing and cooling system is further raised to form high-temperature air; high-temperature air enters a sintering system, the high-temperature air and fuel in the material are combusted at a combustion zone of the sintering system, the material forms sinter, the high-temperature air is converted into high-temperature waste gas, the high-temperature waste gas rises to transfer heat to the upper material, and the temperature of the high-temperature waste gas is reduced to form low-temperature waste gas; the low-temperature waste gas enters a waste heat recovery system through an air suction pipeline to recover waste heat of the waste gas, and the low-temperature waste gas can be sent back to an air inlet cooling system through a fan to be recycled.

Specifically, the shaft kiln sintering machine in step 2 adopts an upper connecting cylinder type structure and a lower connecting cylinder type structure and is connected with a plurality of left and right, the upper part of the shaft kiln sintering machine is provided with a receiving groove, the periphery of the lower part of the receiving groove is connected to the upper part of a sintering system through a sealing cover, the lower part of the sintering system is connected to the upper part of a crushing cooling system, the lower part of the crushing cooling system is connected to the upper part of an air inlet cooling system, the lower part of the air inlet cooling system is connected with a discharging system, and a conveying system for conveying.

Specifically, the sintering system outside is equipped with the vent, and vent department installs filter I for block the material in the sintering system, the vent passes through the vent pipe and connects on air pipe, installs the extraction valve on the vent pipe, and air pipe connects waste heat recovery system, installs the air exhauster in the waste heat recovery system, is used for extracting the exhaust steam in the sintering system.

Specifically, a combustion zone is arranged at the lower part in the sintering system and used for forming sintered ore by burning materials at the combustion zone through fuel, a heat insulation layer is arranged at the periphery of the sintering system and at the combustion zone and is made of refractory materials.

Specifically, a plurality of tooth rollers are installed on the upper portion of the crushing cooling system and used for enabling sinter formed by the sintering system to fall onto the tooth rollers for crushing, and an ignition hole is formed in one side of the crushing cooling system and used for enabling the sinter to enter and exit the ignition device.

Specifically, the outside of the air inlet cooling system is provided with a cold air port for introducing cold air, and the cold air port is provided with a second filter plate.

Specifically, a plurality of temperature thermocouples are arranged outside the shaft kiln sintering machine and used for monitoring the temperature outside the shaft kiln sintering machine and judging the sintering process.

Specifically, the lower inclination angle of the inner wall of the crushing and cooling system is smaller than 90 degrees, and the crushing and cooling system is used for forming a horn shape with a small upper part and a big lower part.

The invention has the following beneficial effects:

1. the method for producing the sintered ore by the shaft kiln type iron ore powder has less air leakage, and compared with a belt type sintering machine, the shaft kiln does not have air leakage among sintering trolleys, a slideway, a machine head, a machine tail and the like;

2. the ignition energy consumption is reduced, the vertical kiln is only ignited in a short time when the kiln is opened for production, and the ignition is not needed during normal production;

3. the quality of the sinter is improved, the sinter is heated and sintered from bottom to top in the vertical kiln production, so that the quality of the sinter is uniform and consistent, and the sinter does not have the upper and lower parts;

4. solid burnup is reduced, the sinter is cooled in the kiln, part of heat is transferred to the material sintering process by cooling air for utilization, and the solid burnup can be greatly reduced;

5. the operation rate of the equipment is increased, the parallel shaft kilns can be independently produced, independently adjusted and independently shut down for maintenance, the normal production of other shaft kilns is not influenced, the long-time shutdown for overhaul is not needed, and the overall operation rate can be greatly improved;

6. the equipment cost is low, the refractory material is used in the high-temperature area, heat-resisting equipment is not needed, and the manufacturing cost and the operating cost are low.

Drawings

FIG. 1 is a schematic structural view of a shaft kiln sintering machine.

Fig. 2 is a side view of two shaft sintering machines in parallel.

In the figure: 1-a feed system; 2-a receiving trough; 3-sealing the cover; 4-sintering system; 5-a crushing cooling system; 6-air intake cooling system; 7-a discharge system; 8-a conveying system; 9-a waste heat recovery system; 10-temperature thermocouple; 401-an air extraction duct; 402-filter plate one; 403-a suction valve; 404-a thermal insulation layer; 405-a combustion zone; 501-toothed rollers; 502-a firing orifice; 601-cold air port; 602-filter plate two.

Detailed Description

The technical solutions in the embodiments of the present invention will be described in further detail in the following clearly and completely with reference to the accompanying drawings in the 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.

As shown in fig. 1-2, a shaft kiln type sintering machine for producing sintered ore from shaft kiln type iron ore powder comprises a feeding system 1, a receiving groove 2, a sealing cover 3, a sintering system 4, a crushing and cooling system 5, an air intake cooling system 6, a discharging system 7, a conveying system 8 and a waste heat recovery system 9; connecting cylinder type structure and can controlling the parallel connection about the shaft kiln sintering machine adopts and have a plurality ofly, shaft kiln sintering machine upper portion is equipped with receives silo 2, receive silo 2 lower part periphery and pass through sealed cowling 3 and connect on sintering system 4's upper portion, sintering system 4's sub-unit connection is on 5 upper portions of broken cooling system, 5 sub-unit connections of broken cooling system are on the upper portion of air inlet cooling system 6, 6 sub-unit connections of air inlet cooling system have discharge system 7, discharge system 7's discharge gate department installs the conveying system 8 who transports the sintering deposit.

Sintering system 4 outside is equipped with the vent, vent department installs filter 402 for block the material in the sintering system, the vent passes through the ventilation pipe and connects on ventilation pipe 401, install extraction valve 403 on the ventilation pipe, be used for controlling the break-make of single shaft kiln formula sintering machine, ventilation pipe 401 connects waste heat recovery system 9, install the air exhauster in the waste heat recovery system 9, waste heat gas for extracting sintering system 4 forms the negative pressure, make the cold wind of lower part cold-blast mouth 601 department upwards move. The lower part in the sintering system 4 is provided with a combustion zone 405 for materials to form sintered ore through fuel combustion at the combustion zone 405, and a heat insulation layer 404 is arranged at the periphery of the sintering system 4 and at the combustion zone 405, and is made of refractory materials and used for prolonging the service life of equipment.

The upper part of the crushing cooling system 5 is provided with a plurality of toothed rollers 501 for the sinter formed by the sintering system 4 falls on the toothed rollers 501 for crushing, and one side of the crushing cooling system 5 is provided with an ignition hole for entering and exiting the ignition device. The lower inclination angle of the inner wall of the crushing cooling system 5 is less than 90 degrees, and the crushing cooling system is used for forming a horn shape with a small top and a big bottom.

The outside of the air inlet cooling system 6 is provided with a cold air port 601 for introducing cold air, and a second filter plate 602 is installed at the position of the cold air port 601 for preventing impurities from entering the shaft kiln sintering machine.

A plurality of temperature thermocouples 10 are arranged outside the shaft kiln sintering machine and used for monitoring the temperature outside the shaft kiln sintering machine and judging the sintering process.

A method for producing sintered ore by shaft kiln type iron ore powder comprises the following steps:

1) pelletizing iron ore powder: mixing the production material containing iron ore powder with fuel and flux, and adding water to pelletize into spherical iron ore;

2) producing sintered ore: adding the spherical iron ore into a receiving groove 2 at the upper part through a feeding system 1 arranged in a shaft kiln sintering machine, then dropping the spherical iron ore into a sintering system 4 connected to the lower part of the receiving groove 2, and drying, preheating and combusting internal fuel in the sintering system 4 by hot waste gas to form sintered ore;

3) and (3) crushing and cooling sintered ore: the sintered ore falls into a crushing and cooling system 5 connected with the lower part of a sintering system 4, the sintered ore is crushed through a toothed roller 501 arranged in the crushing and cooling system 5, the crushed sintered ore falls into an air inlet cooling system 6 connected with the lower part of the crushing and cooling system 5, and the air inlet cooling system 6 blows cold air into a vertical kiln sintering machine through a cold air port 601 arranged to cool the sintered ore;

4) discharging and transporting sintered ore: the cooled sintered ore falls onto a discharge system 7 at the lower part, and the discharge system 7 discharges the sintered ore onto a transportation system and conveys the sintered ore to a finishing system;

5) and (3) ventilation flow: the sintering system 4 is connected with a plurality of shaft kiln sintering machines through an air exhaust pipeline 401, air is exhausted through a waste heat recovery system 9 arranged on the air exhaust pipeline 401, negative pressure is formed in the cavity of the sintering system 4, cold air enters an air inlet cooling system 6 from a cold air port 601 to exchange heat with descending sintering ores under the action of the negative pressure, the temperature is raised, and hot air is formed; the hot air enters a crushing and cooling system 5, and the temperature is further raised to form high-temperature air; high-temperature air enters the sintering system 4, the high-temperature air is combusted with fuel in the material at a combustion zone 405 of the sintering system 4, the material forms sinter, the high-temperature air is converted into high-temperature waste gas, the high-temperature waste gas rises to transfer heat to the upper material, and the temperature of the high-temperature waste gas is reduced to form low-temperature waste gas; the low-temperature waste gas enters the waste heat recovery system 9 through the exhaust pipeline 401 to recover waste heat of the waste gas, and the low-temperature waste gas can also be sent back to the air inlet cooling system 6 through the fan to be recycled.

The material receiving groove 2 has a sealing function besides the material receiving function, so that the air entering the air draft pipeline 401 from the upper part is reduced; the first filter plate 402 reduces the material entering the air draft pipeline 401; the suction valve 403 closes the single shaft sintering machine in the case of maintenance or the like. The refractory material used for the thermal insulation layer 404 is arranged in the high-temperature section, so that the service life of the equipment is prolonged. The temperature thermocouples 10 at each location are used to monitor temperature operating instructions and determine the sintering process. The inclination angle of the lower part of the inner wall of the crushing and cooling system 5 is smaller than 90 degrees, and the inner space is gradually increased, so that the material is favorably lowered and cooled; the function of the toothed roller 501 is to crush the sinter and to control the blanking speed by adjusting the rotation speed, so as to achieve the purpose of adjusting the production process. The ignition hole 502 is used to put fuel in the ignition device, igniting the material at the time of initial production: when the kiln is opened for production, part of sintering ore is loaded and spread on the toothed roller 501, a layer of solid fuel is distributed on the sintering ore layer, the solid fuel is a sintering mixture, the ignition hole 502 is opened, ignition equipment (such as a gas igniter and the like) is placed for ignition, after the solid fuel is ignited, the ignition equipment is taken out, the ignition hole 502 is closed, the fan is gradually started for air draft or the air draft valve 403 is opened, and the normal production state is achieved. The second filter plate 602 is used to prevent the powder material from leaking out.

The present invention is not limited to the above embodiments, and any structural changes made under the teaching of the present invention shall fall within the scope of the present invention, which is similar or similar to the technical solutions of the present invention.

The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.