CN210596198U - Sintering heat preservation device and sintering machine - Google Patents

Abstract

The utility model discloses a sintering heat preservation device and sintering machine belongs to the sintering equipment field. The heat preservation device comprises a heat preservation cover with upper and lower openings, a heat exchanger is arranged in the heat preservation cover, the upper opening of the heat preservation cover is sealed, the heat exchanger preheats the outside air entering the heat preservation cover during sintering operation, the heat dissipated from a sintering material surface can be fully utilized to form a gradually reduced trapezoidal temperature field, the oxygen supply uniformity of the cross section of the sintering trolley is improved, the sintering quality of the upper part of a sintering material layer is improved, and the ore return rate is reduced. The sintering machine comprises a sintering trolley, an ignition furnace and the heat preservation device, can preserve heat and supply sufficient oxygen to a sintering material layer, and improves the quality of the upper part of the sintering material layer and the uniformity of a sintering cross section.

Description

Sintering heat preservation device and sintering machine

Technical Field

The utility model belongs to the sintering equipment field, more specifically say, relate to a sintering heat preservation device and sintering machine.

Background

After sintering ignition, heat preservation treatment is carried out to reduce the heat dissipated from the surface of a sinter bed, avoid the rapid cooling of surface layer sinter, prolong the generation time of a surface layer sinter bonding phase and simultaneously facilitate the reducibility and strength enhancement of calcium ferrite minerals in the bonding phase. However, the incomplete heat preservation system easily causes the undercusive phenomenon on the surface of a material bed, the floating ash appears on the surface of a sintering ore, and a large amount of return ores are generated, so that the sintering productivity is reduced, the metallurgical performance of the sintering ore is reduced, and the sintering energy consumption is increased.

Ignition and heat preservation of a sintering machine are generally divided into three sections: the first section is an ignition furnace, the second section is a holding furnace (provided with a burner), and the third section is a holding cover (not provided with a burner). The first section and the second section are provided with burners, combustion air is used for forcibly supplying oxygen to the charge surface, and the third section of the heat-insulating cover is not provided with burners, but is used for assisting sintering by introducing external air or oxygen-containing gas, and generally comprises two forms of air suction and air blowing.

The air suction type heat preservation cover is generally used for passively introducing air from the upper part of the charge level through air suction negative pressure, and in order to ensure the heat preservation effect, the top of the heat preservation cover needs to be close to the charge level. According to the knowledge of the utility model, the structure of the air suction type heat preservation cover can be arranged as shown in fig. 1 and fig. 2. When the air-suction type heat preservation cover is adopted, the air required by sintering can be supplied by four ways: firstly, the heat insulation cover enters from a gap between the tail part of the heat insulation cover and the charge level; secondly, the heat insulation cover enters through the gap between the side fence plates of the sintering machine trolley and the heat insulation cover; thirdly, opening a ventilation pipe valve at the top of the cover to ventilate when the negative pressure of the ventilation is higher; fourthly, the air is blown from a heat preservation furnace or an ignition furnace in front of the heat preservation cover.

However, the four gas inlet paths may cause the following problems during sintering: the air entering through the first way is only subjected to radiation heating by the charge level and two surfaces at the top of the heat-insulating cover, the temperature is lower, the air can be sucked by the charge level at the tail of the heat-insulating cover firstly, the drawing force in the direction close to the ignition furnace is larger, so that the air can be rushed from the ignition furnace, the ignition gas consumption is increased, and the phenomenon is more serious when the heat-insulating cover is longer; the air entering through the second path is not preheated basically, and most of the air directly enters the edges of the two sides of the trolley, so that the upper parts of the material layers of the two sides are not insulated and are forcibly quenched; the air flow rate entering from the third way is higher and is not preheated, and the air flow rate directly enters the charge level below the ventilation pipe, so that the heat preservation effect is weakened, the quality of the upper layer of a sinter bed is deteriorated, the air quantity entering from the transverse charge level of the trolley is different from the heat preservation effect, and the transverse nonuniformity of the sinter trolley is further enhanced; the flue gas sucked from the way four can play a role of heating the charge level, but the consumption of ignition gas is increased, and the ignition effect is also damaged.

The blowing type heat preservation cover is generally provided with a blowing device, external hot air is introduced to heat the charge level so as to strengthen the mineralization effect of the surface layer sintered ore, improve the yield of the surface layer sintered ore and reduce the quantity of returned ore, but the blowing type heat preservation cover needs an external heat source to heat oxygen-containing gas such as air, so that the cost is improved, the heat dissipated from the surface of the sintered ore layer is not fully utilized, and the energy utilization rate is not high.

At present, some structures are designed in the market aiming at ignition and heat preservation measures during sintering production, and the structures are introduced below.

The Chinese patent application numbers are: CN201010018249.7, published date: patent literature on 7/4/2012 discloses a single preheating sintering ignition holding furnace, wherein an air preheating furnace is arranged in a holding section, the air preheating furnace is used for igniting blast furnace gas by burning, and the air preheating furnace is used for preheating the gas or air and then meeting the ignition temperature required by the ignition furnace. The heat exchanger of the device mainly makes the ignition furnace possess sufficient ignition temperature, and it does not set up the heat preservation cover behind the heat preservation stove, consequently can't provide complete ladder temperature field and heat, and subsequent sintering heat preservation effect is not good.

The Chinese patent application numbers are: CN201020302783.6, published date: the patent document 9/29 2010 discloses a refractory lining for a sintering ignition heat-preserving furnace and the sintering ignition heat-preserving furnace thereof, which mainly adopt a lining structure with a heat accumulation section to enhance the heat efficiency of ignition and heat preservation and reduce the heat load of a cross beam. However, the heat radiation in the middle of the heat preservation section is more than that in the two ends, so that the sintering material layer can undergo the adverse process of temperature reduction and then temperature rise when entering the heat preservation section, the sintering quality is influenced, and in addition, the correct way of supplying sufficient oxygen to the sintering material layer is also lacked.

The Chinese patent application numbers are: CN201210522679.1, published date: patent literature 3/20/2013 discloses a sintering ignition furnace, which improves the utilization rate of heat energy and reduces the loss of ignition heat by arranging a preheating section between an ignition section and a heat preservation section of a furnace body and arranging an air curtain between the preheating section and the ignition section. However, the temperature of the air curtain of the device is greatly different from the ignition temperature, and the sintering charge surface is quenched when passing through the air curtain after ignition, so that the quality of the surface layer sintering ore is damaged. In addition, the long heat preservation section of the sintering pallet aggravates insufficient oxygen supply of the material surface of the pallet and non-uniformity of transverse sintering of the sintering pallet.

The following are two patents for introducing oxygen-containing gas such as high temperature air.

For example, the Chinese patent application number is: CN201511002749.0, published date: patent literature of 7 months and 7 days in 2017 discloses an ignition holding furnace of a sintering machine, which comprises an ignition section, a heat preservation section and a hot air sintering holding cover, wherein the ignition section is connected with the heat preservation section, and the hot air sintering holding cover is positioned behind the heat preservation section and is connected with the heat preservation section.

Also, for example, the Chinese patent application number is: CN201610815800.8, published date: the patent literature of 2017, 1 month and 25 days discloses a presintering ultra-thick material layer sintering method for reducing the rate of return sintering ore, which optimizes the ignition temperature, configures a proper number of heat preservation covers and introduces hot air with high oxygen content, can effectively improve the ignition quality of the surfaces of upper and lower layers of sintering ore, prolongs the mineralization time of surface sintering materials and reduces the cold brittleness phenomenon of the sintering ore. And the air permeability of the upper layer sintering mixture is improved by reasonably distributing coal and water for the upper layer sintering mixture and reducing the roller number of the distributing device. Meanwhile, according to the characteristics of the mixture of the upper layer, segregation of fuel and granularity of the material layer is inhibited, the material layer is prevented from burning too fast, and the return ore rate of the upper-layer sinter ore and the whole sinter bed can be effectively reduced through comprehensive technical measures.

The last two schemes adopt certain measures aiming at the heat preservation and the oxygen supply of the charge level, thereby being incapable of cooling the charge level too fast and ensuring sufficient oxygen, and reducing the ore return rate, but the two schemes are used for preserving the heat and supplying the oxygen to the sintering ore by introducing hot air from the outside, and needing the heating of an external extra heat source, and the requirement on equipment is too high when the temperature of the heat source is too high, the cost is higher, and the temperature which is lower and is more than 1000 ℃ relative to the ignition furnace can cause the sharp cooling of the charge level, and the measure of introducing the hot air is constant, the temperature of the hot air can not be changed along with the reduction of the temperature of the charge level, so that the charge level is difficult to be uniformly cooled, certain influence is caused on the molding quality of the sintering material, and the reduction of the ore return rate is not.

SUMMERY OF THE UTILITY MODEL

1. Problems to be solved

To current heat preservation cover when sintering production, exist from the ignition furnace robbing wind, gas consumption is big, the charge level is by the uneven scheduling problem of air quantity that sharp quenching or the horizontal charge level of platform truck got into, the utility model provides a sintering heat preservation device, its heat that can make full use of sintering charge level scatter and disappear forms the trapezoidal temperature field that reduces gradually, and for the cross section direction supply of sintering platform truck is even, sufficient oxygen, improves the oxygen suppliment homogeneity of sintering platform truck cross section to improve the sintering quality on sinter bed upper portion, reduce the rate of returning ores.

The utility model also provides a sintering machine, this sintering machine have above-mentioned sintering heat preservation device, can compromise when heat retaining and supply sufficient oxygen to the sinter bed, improve the quality on sinter bed upper portion and the homogeneity of sintering cross section.

2. Technical scheme

In order to solve the above problems, the utility model adopts the following technical proposal.

A sintering heat preservation device comprises a heat preservation cover with an upper opening and a lower opening, wherein a heat exchanger is arranged in the heat preservation cover, and the upper opening of the heat preservation cover is closed; the heat exchanger is used for preheating the outside air entering the heat-insulating cover during sintering operation.

Furthermore, the heat-insulating cover also comprises a side baffle, a cross beam and a rear baffle; the beam is connected with the rear end of the ignition furnace, one end of the heat exchanger is connected with the beam, and the other end of the heat exchanger is provided with a rear baffle; the side baffles are symmetrically arranged at two sides of the heat exchanger in the length direction.

Furthermore, a sealing curtain is arranged at the lower end of the rear baffle.

Furthermore, a sealing groove is formed in the lower end of the side baffle close to the inner side of the heat insulation cover, and sealing materials are filled in the sealing groove; during sintering, the edge of the upper end of the side fence plate on the sintering trolley extends outwards to form a sealing plate, and the lower end of the sealing plate is inserted into the sealing material to form a sealing structure with the side fence plate; the sealing material is used for filling a gap between the sealing groove and the sealing plate.

Further, the sealing material is sand or slag.

Further, the heat exchanger adopts a rib plate type radiation heat exchanger.

Further, the heat exchanger has a plurality ofly, arranges in parallel along the traffic direction of sintering pallet.

A sintering machine comprises a sintering trolley, an ignition furnace and a heat preservation device, wherein the ignition furnace is arranged above the feeding end of the sintering trolley, an air draft system is arranged below the sintering trolley, and the heat preservation device is arranged at the rear end of the ignition furnace above the charge level of the sintering trolley; the heat preservation device adopts the sintering heat preservation device.

The sintering method of the sintering machine comprises the following steps:

opening an ignition furnace, finishing the distribution of sintering materials on a sintering trolley, igniting the sintering materials by the ignition furnace, and then entering a heat-preservation cover;

and secondly, the lower part of the heat exchanger receives the heat radiation of the sintering charge level, so that the heat exchange fins in the heat exchanger are heated, and air enters from the upper part of the heat exchanger under the action of the air draft system to exchange heat with the heat exchange fins and then enters the surface of the sintering charge level.

Furthermore, the ignition temperature of the ignition furnace is 900-1150 ℃, the temperature of air entering the sintering charge level from the outlet of the ignition furnace end of the heat preservation cover is 600-950 ℃, and the temperature of air entering the sintering charge level from the outlet of the ignition furnace end of the heat preservation cover is 10-200 ℃.

3. Advantageous effects

Compared with the prior art, the beneficial effects of the utility model are that:

(1) the utility model relates to a sintering heat preservation device, the heat preservation cover that links to each other with the ignition furnace is installed to the sintering platform truck upper end behind the ignition furnace, prevents that the sintering mineral aggregate that comes out from the ignition furnace from taking place the rapid cooling, influences the quality of sintering deposit, however, in the combustion process of sintering mineral aggregate, need fully supply oxygen to sintering mineral aggregate, the utility model discloses cloth heat exchanger in the heat preservation cover, the air is under the negative pressure of sintering exhaust system, gets into and finally gets into the sintering charge level from the upper end of heat exchanger, and the lower extreme of heat exchanger then receives the thermal radiation of sintering charge level and heats the air that flows in the heat exchanger, thereby makes the air become the temperature that is close to sintering charge level temperature after the heat exchanger heating, when providing sufficient oxygen for the sintering charge level, plays the heat preservation effect to the sintering charge level, makes the sintering charge level fully burn, reduces the rate of returning to ore, compared with the prior mode that the heat preservation cover blows in high-temperature gas, the utility model discloses make full use of the heat that the sintering charge level scatters and disappears, on the one hand only need absorb outside air can, need not outside gas heating equipment and let in equipment, the occupation of land space and the installation loaded down with trivial details degree of equipment have been reduced, on the other hand has improved the energy utilization in the sintering production greatly, and along with the temperature reduction of the sintering charge level of keeping away from the ignition furnace, the air after the heat exchanger heating also can keep cooling in step with it, namely the hot air of heat exchanger export reduces self temperature along with keeping away from the ignition furnace gradually, thereby make the sintering charge level have an even cooling rate, be favorable to the sintering homogeneity of charge level, improve charge level sintering quality;

(2) the utility model relates to a sintering heat preservation device, which is provided with sealing measures at the side edge and the outlet of a heat preservation cover, can prevent air which is not heated from entering from the side edge and the outlet of the heat preservation cover, prevent the sintered charge surface from being cooled too fast, ensure the sintered mineral aggregate to be fully combusted, and reduce the ore return rate;

(3) the utility model relates to a sintering heat preservation device sets up the seal groove that has husky or slay to fill at the side shield lower extreme, and the side shield upper end edge of sintering platform truck both sides outwards extends the closing plate, and the lower extreme of closing plate inserts husky or slay in, constitutes seal structure with the side shield. While the sealing is ensured, the sealing plate can move in sand or slag in a small range, the sealing performance is good, and if a static seal which does not move relatively is adopted, the sealing element is easy to loosen due to vibration and the like under the long-term work of the sintering machine, so that the sealing performance is influenced;

(4) the utility model relates to a sintering heat preservation device, a high temperature resistant and wear resistant sealing curtain is arranged below a rear baffle at the outlet of a heat preservation cover, so that the sealing performance of the heat preservation cover is ensured, and sintering materials can be smoothly sent out of the heat preservation cover;

(5) the prior air suction type or air blowing type heat preservation cover has the advantages that the air supply in the cross section direction of the sintering charge level is difficult to be uniform, the oxygen supply in the cross section direction of the sintering trolley is uneven, the sintering uniformity of the sintering charge is influenced, and the utility model relates to a sintering heat preservation device, the air outlet of a heat exchanger is uniformly distributed along the cross section direction of the sintering trolley, the uniform and sufficient oxygen can be supplied for the cross section direction of the sintering trolley, the uniformity of the cross section of the sintering trolley is improved, the sintering quality of the sintering charge level is improved, the ore return rate is reduced, furthermore, a ribbed plate type radiation heat exchanger is adopted as the heat exchanger in the heat preservation cover, compared with a convection type heat exchanger, the heat exchange cover has the advantages of high heat release rate (heat load), high heating temperature of cold fluid, small difference between the surface temperature and the heating temperature of a heated medium, and the like, and is favorable for the formation, therefore, the hot air sprayed to the sintering charge level by the heat exchanger is close to the temperature of the sintering charge level and the sintering charge level is uniformly cooled, and the gas outlets at the lower end of the ribbed plate type radiation heat exchanger are uniformly distributed on the lower end surface of the ribbed plate type radiation heat exchanger, so that the oxygen supply uniformity of the whole sintering charge level is fully met, and the sintering quality of the sintering charge is improved;

(6) the utility model relates to a sintering machine, which is provided with a sintering heat preservation device of the utility model, can preserve heat and supply sufficient oxygen to a sinter bed, and improve the quality of the upper part of the sinter bed and the uniformity of a sintering cross section;

(7) the utility model relates to a sintering method adopts the utility model discloses a sintering machine carries out the sintering operation of raw materials, through reasonable technological parameter's settlement, makes the sintering material leave behind the ignition furnace, can guarantee slow even cooling rate under the environment that oxygen is sufficient, and the oxygen suppliment in sintering charge level cross section side is even, makes the sintering material fully burn, reduces the rate of returning mine.

Drawings

FIG. 1 is a front view of a prior art aspirating incubation cover;

FIG. 2 is a top view of a prior art aspirating incubation cover;

FIG. 3 is a front view of a sintering machine;

FIG. 4 is a top view of the holding device;

FIG. 5 is a front view of the temperature maintenance device;

FIG. 6 is a schematic view of a side dam seal structure of the insulating cover;

FIG. 7 is a schematic view of a heat retention shield backplate seal arrangement;

in the figure: 1. sintering the trolley; 11. a side fence panel; 12. a sealing plate;

2. an ignition furnace;

3. a heat-preserving cover; 31. a heat exchanger; 32. a side dam; 33. a cross beam; 34. a tailgate; 35. a sealing groove; 36. a sealing material; 37. and (6) sealing the curtain.

Detailed Description

The invention will be further described with reference to specific embodiments and drawings.

Example 1

In the sintering production, after the sintering material is ignited, the sintering material needs to be insulated, in the prior art, a heat-insulating furnace or a heat-insulating cover is generally additionally arranged behind an ignition furnace, and the sintering material surface separated from the ignition furnace 2 is insulated. However, the heat preservation cover is simply adopted, so that although the heat loss of the sintering charge level can be reduced, the air or oxygen supply is relatively insufficient, and the air is rushed from the ignition furnace 2 above the sintering charge level under the action of the negative air draft pressure of the air draft system below the sintering trolley, so that the work of the ignition furnace is influenced. If air is introduced into the upper opening of the heat-insulating cover or introduced into the gap at the tail or two sides of the heat-insulating cover, the sintered charge surface is easily quenched, the sintering quality is affected, and the ore return rate is increased.

In order to supplement the heat of the upper part of the sinter bed, a blowing device is arranged in part of the heat preservation cover, is connected with an external heated air source and blows air to the sinter charge surface, so that oxygen is provided for the sinter charge surface, and the high-temperature gas can also play a certain heat preservation role. However, when the measure is taken, an external extra heat source is needed for heating, and if the temperature of the heat source is too high, the requirement on equipment is too high, and the cost is higher; if the high-temperature gas of the waste heat of part of equipment is utilized, the temperature is not high, the charge level can be rapidly cooled compared with the temperature of about 1000 ℃ of an ignition furnace, and the temperature of hot air is not changed by the measure of introducing hot air, so that the temperature of the charge level can not be changed along with the reduction of the temperature of the charge level, the charge level is difficult to be uniformly cooled, the forming quality of the sintered charge level is influenced to a certain extent, and the reduction of the ore return rate is not facilitated.

As shown in fig. 4 and 5, the present embodiment provides a sintering heat preservation device, which includes a heat preservation cover 3 installed at the rear end of an ignition furnace 2 above a sintering pallet 1, and performs heat preservation measures on a sintering material discharged from the ignition furnace 2, and the specific structure and the operation principle of the heat preservation cover 3 are described in detail below.

The heat-insulating cover 3 includes a heat exchanger 31, side baffles 32, a cross member 33, and a back baffle 34. Wherein, the beam 33 is connected with the rear end of the ignition furnace 2, and a fireproof beam is adopted; the feed end of the heat exchanger 31 is connected with the cross beam 33, and the discharge end is connected with the rear baffle 34; the side baffles 32 are symmetrically arranged at two sides of the sintering trolley 1 and are respectively connected with two sides of the heat exchanger 31. Heat exchanger 31 is upper and lower open-ended structure, install in heat preservation cover 3 as the cover top of heat preservation cover 3, under the exhaust system's of sintering platform truck 1 below effect, outside air gets into and circulates downwards from heat exchanger 31's upper end, the lower extreme then receives the scattered and disappearing thermal radiation of sintering charge level, make inside heat exchanger fin heated, when the air flows in heat exchanger 31, become the hot-air that is close with sintering charge level temperature after being heated by the heat exchanger fin, thereby when providing sufficient oxygen for sintering charge level, play the heat preservation effect to sintering charge level, make sintering material fully burn, reduce the rate of returning ores. Compared with the existing mode that partial heat preservation cover lets in high-temperature oxygen-containing gas, this embodiment make full use of the lost heat of sintering charge level, on the one hand, 31 top direct contact of heat exchanger is external, it is more convenient to draw the air, and need not outside gas heating equipment and let in equipment, the occupation of land space and the installation loaded down with trivial details degree of equipment have been reduced, on the other hand heats the air heating of suction through the lost heat of charge level, the energy utilization in the sintering production is greatly improved, and along with keeping away from the temperature reduction of the sintering charge level of ignition furnace 2, the air after the heat exchanger 31 heating also can keep synchronous cooling thereupon, heat exchanger 31 spun hot-air changes self temperature gradually along with the sintering charge level keeps away from ignition furnace 2, thereby make the sintering charge level have an even cooling rate, be favorable to the sintering homogeneity of charge level, improve charge level sintering quality.

In addition, the existing air suction type or air blowing type heat preservation cover is difficult to realize uniform air supply in the cross section direction of the sintering material surface, so that the oxygen supply in the cross section direction of the sintering trolley is not uniform, and the sintering uniformity of the sintering material is influenced. In the heat preservation device of the embodiment, the air outlets of the heat exchanger 31 are densely distributed at the bottom of the heat exchanger 31 and uniformly distributed on the whole charge level of the sintering trolley 1, so that uniform and sufficient oxygen supply to the whole charge level is ensured, the uniformity of the cross section of the sintering trolley 1 is improved, the sintering quality of the sintered charge level is improved, and the ore return rate is reduced. In this embodiment, a ribbed plate type radiation heat exchanger is used as the heat exchanger 31, and the lower part of the heat exchanger 3 receives heat radiation from the sintering charge level and heats the heat exchange fins on the upper part of the heat exchanger 3 through heat conduction. Meanwhile, air enters from the upper part of the heat exchanger 3 under the negative pressure action of the air draft system below the sintering trolley 1, and forms hot air after being subjected to sufficient heat exchange with the heat exchange fins of the heat exchanger 3, and the hot air is blown into the surface of the sintering material from the lower end of the heat exchanger 3. Compared with a convection type heat exchanger, the radiation heat exchanger has the advantages of high heat release rate (heat load), high heating temperature of cold fluid, small difference between the surface temperature and the heating temperature of a heated medium and the like, and is beneficial to forming a trapezoidal temperature field of the embodiment, thereby ensuring that the heat sprayed to the sintering charge level by the heat exchanger is close to the temperature of the sintering charge level and the uniform cooling of the sintering charge level. And the gas outlets at the lower end of the ribbed plate type radiation heat exchanger are uniformly distributed on the lower end surface of the ribbed plate type radiation heat exchanger, so that the oxygen supply uniformity of the whole sintering material surface is fully met, and the sintering quality of the sintering material is improved. It is worth mentioning that, as shown in fig. 5, the plurality of heat exchanging fins in the heat exchanger 3 of the present embodiment are arranged in a staggered manner from top to bottom in the heat exchanger, and when air enters from the upper portion of the heat exchanger 3 and passes through the heat exchanging fins, the flow paths in the heat exchanging fins are alternately folded in a bow-shaped manner, so that the time for the air to stay between the heat exchanging fins is increased, the air fully absorbs the heat of the heat exchanging fins, and the heat exchanging efficiency is improved.

In addition, in order to prevent the sinter from sucking in air that has not been preheated, the present embodiment is provided with a seal structure at both the side dams 32 and the back dam 34 of the heat-retaining cover 3.

The seal structure at the side dams 32 is first described: as shown in fig. 6, a sealing groove 35 arranged along the running direction of the sintering pallet 1 is bent and extended from the lower end of the side dam 32 near the inner side of the sintering pallet 1, and a sealing material 36 is filled in the sealing groove 35. And in match, side fence plates 11 are arranged at two sides of the running direction of the sintering trolley 1, a sealing plate 12 with a rectangular structure extends outwards from the upper end edge of the side fence plate 11, and the lower end of the sealing plate 12 is inserted into a sealing material 36 in a sealing groove 35, so that the side fence plates 11 and the side baffle plates 32 form a sealing structure. It is worth mentioning that if a static sealing structure is adopted, during the sintering process, the sealing element is easy to loosen due to vibration and the like under the long-term operation of the sintering machine, so that the sealing property is reduced, and the sintering quality is influenced. The sealing material 36 may be made of a material having a high temperature resistance and a good fluidity, such as sand or slag, and of course, sand is the most preferable sealing material. Sand is used as the sealing material of the present embodiment, and the lower end of the sealing plate 12 is inserted into the sand, so that a dynamic sealing effect, i.e., sand sealing, between the sealing groove 35 and the sealing plate 12 is achieved by the sand. The seal plate 12 can move within a small range in the seal groove 35 in response to the vibration of the pallet 1, and the seal is excellent, and the reduction in the sealing performance of the static seal does not occur. It should be noted that, during sintering, the sintering trolley 1 and the heat-insulating cover 3 move relatively, so that notches for the sealing plate 12 on the sintering trolley 1 to pass through can be formed at two ends of the sealing groove 35, and the notches can be blocked by a flexible material, such as a rubber baffle, so that the loss of the sealing material 36 in the sealing groove 35 can be effectively prevented.

As shown in fig. 7, a sealing curtain 37 is installed at the rear baffle 34 of the heat-insulating cover 3, so that a gap between the sintered charge level at the rear baffle 34 and the rear baffle 34 is eliminated, and the sealing performance of the heat-insulating cover 3 is improved. In this embodiment, the sealing curtain 37 may be a high-temperature-resistant and wear-resistant sealing curtain commonly available in the market.

In conclusion, the sintering heat preservation device of this embodiment, through installation heat exchanger 31, the air outside the cover that the heat that can the make full use of sintering charge level scatter and disappear heats, energy utilization is high, the air after the heating can provide the required oxygen of sintering for the sintering charge level, and form the trapezoidal temperature field that reduces gradually along with the temperature reduction of sintering charge level, sintering charge level cooling rate is even, make the sintering of sintering charge level more even, and its air feed to the cross section direction of sintering platform truck is even, the homogeneity of sintering charge level cross section has been improved, the sintering quality of sintering material has been improved.

Example 2

As shown in fig. 3, a sintering machine, which is mainly used for sintering operation in a metallurgical sintering plant, sinters various ore powders into briquettes and partially eliminates harmful impurities in the ores. Which comprises a sintering trolley 1, an ignition furnace 2 and a heat preservation device. The sintering pallet 1 is a main operation part of the sintering machine, the sintering material is ignited, sintered, cooled and the like on the sintering pallet, and an exhaust system is arranged below the sintering pallet, and generally an exhaust fan and other devices are adopted. The ignition furnace 2 is installed above the feeding end of the sintering trolley 1 and is used for igniting sintering materials. The heat preservation device adopts the sintering heat preservation device in the embodiment 1, can simultaneously preserve heat and supply sufficient oxygen to the sintering material layer, improve the quality of the upper part of the sintering material layer and the uniformity of the sintering cross section, and the specific structure and the working principle of the device are described in detail in the embodiment 1 and are not described again.

Example 3

A sintering method of a sintering machine adopts the sintering machine of embodiment 2 to perform sintering work, and comprises the following steps:

firstly, opening an ignition furnace 2, wherein the ignition temperature is 900-1150 ℃, after the sintering material is distributed on a sintering trolley, the sintering trolley 1 conveys the sintering material at the running speed of 1.0-2.5 m/min to pass through the ignition furnace 2 for ignition, in the embodiment, 2m/min is taken, and it needs to be noted that the running speed of the sintering trolley 1 needs to be selected according to the actual working condition, but generally does not exceed the range; and then, the sintered material enters the heat-insulating cover 3, the length of the heat-insulating cover 3 is set according to the actual production process and is generally kept within 2-10 m, and 6m is taken in the embodiment.

Secondly, the lower part of the heat exchanger 31 receives the heat radiation of the sintering charge surface and heats the heat exchange plates in the heat exchanger 31 through heat conduction. Meanwhile, air enters the heat exchanger 31 from the upper end of the heat exchanger 31 under the action of the negative pressure of the air draft system, and uniformly enters the sintering charge level after heat exchange with the heat exchange fins, so that the oxygen supply uniformity of each position of the sintering charge level, particularly the cross section direction of the sintering trolley 1, is maintained.

In the step, the heat exchanger 31 at the inlet of the heat-insulating cover 3 absorbs the heat of the sintering charge surface just coming out of the ignition furnace 2, the temperature of the blown air is 600-950 ℃, the temperature of the sintering charge surface at the inlet of the heat-insulating cover 3 is 900-1150 ℃, the temperature of the blown air is close to the temperature of the charge surface while the high heat of the sintering charge surface at the moment is fully utilized, and the heat-insulating effect on the charge surface is better while sufficient oxygen supply is ensured; the temperature of the material surface at the outlet of the heat-insulating cover 3 is 10-200 ℃, the temperature of air blown out by the heat exchanger 31 at the outlet is 10-200 ℃, and the temperature are basically consistent. From this, it is understood that the temperature of the air blown out from the heat exchanger 31 is gradually decreased along with the gradually decreasing temperature of the sintering charge level along the running direction of the sintering carriage 1, so that the sintering charge level can be uniformly cooled along with the running of the sintering carriage 1, and the sintering quality is improved. In this step, the air flow rate in and out of the heat exchanger 31 is 0.2-1.5m/s, which varies with the sintering conditions, but generally does not exceed this range.

After the sintering method is adopted for sintering, the sintering quality of the sintering material layer is improved, and particularly the sintering quality of the upper part of the sintering material layer is obviously improved.

In summary, in the sintering method of the sintering machine according to the embodiment, after the sintering material leaves the ignition furnace 2, the slow and uniform cooling rate can be ensured in the environment with sufficient oxygen through the setting of reasonable process parameters, so that the sintering material is sintered more uniformly, and the sintering quality is improved.

The example of the utility model is only right the utility model discloses a preferred embodiment describes, and is not right the utility model discloses design and scope are injectd, do not deviate from the utility model discloses under the prerequisite of design idea, the field engineering technical personnel is right the utility model discloses a various deformation and improvement that technical scheme made all should fall into the protection scope of the utility model.

Claims (8)

1. The utility model provides a sintering heat preservation device, includes upper and lower open-ended heat preservation cover (3), its characterized in that: the heat-insulating cover (3) comprises a heat exchanger (31), a cross beam (33) and a rear baffle (34); the cross beam (33) is connected with the rear end of the ignition furnace (2), one end of the heat exchanger (31) is connected with the cross beam (33), and the other end of the heat exchanger is provided with a rear baffle (34) to seal an upper side opening of the heat-insulating cover (3); the air outlets of the heat exchanger (31) are uniformly distributed along the cross section direction of the sintering trolley (1); the heat exchanger (31) is used for preheating the outside air entering the heat-insulating cover (3) during sintering operation.

2. The sintering heat preservation device of claim 1, wherein: the heat preservation cover (3) also comprises a side baffle (32); the side baffles (32) are symmetrically arranged at two sides of the heat exchanger (31) in the length direction.

3. The sintering heat preservation device of claim 2, wherein: and a sealing curtain (37) is arranged at the lower end of the rear baffle (34).

4. The sintering heat preservation device of claim 2, wherein: a sealing groove (35) is formed in the lower end of the side baffle (32) close to the inner side of the heat-insulating cover (3), and a sealing material (36) is filled in the sealing groove (35); during sintering, the upper end edge of a side fence plate (11) on the sintering trolley (1) extends outwards to form a sealing plate (12), and the lower end of the sealing plate (12) is inserted into a sealing material (36) to form a sealing structure with a side baffle plate (32); the sealing material (36) is used for filling a gap between the sealing groove (35) and the sealing plate (12).

5. The sintering heat preservation device of claim 4, characterized in that: the sealing material (36) is sand or slag.

6. The sintering insulation apparatus according to any one of claims 1 to 5, wherein: the heat exchanger (31) adopts a rib plate type radiation heat exchanger.

7. The sintering insulation apparatus according to any one of claims 1 to 5, wherein: the heat exchangers (31) are arranged in parallel along the running direction of the sintering trolley (1).

8. The utility model provides a sintering machine, includes sintering pallet (1) and ignition furnace (2), the feed end top at sintering pallet (1) is installed in ignition furnace (2), the below of sintering pallet (1) is equipped with exhaust system, its characterized in that: also comprises a heat preservation device; the heat preservation device is arranged at the rear end of the ignition furnace (2) above the charge level of the sintering trolley (1); the heat preservation device adopts a sintering heat preservation device as claimed in any one of claims 1 to 7.

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