CN116334331A

CN116334331A - Blast furnace tuyere device, tuyere small sleeve, tuyere medium sleeve and energy-saving method thereof

Info

Publication number: CN116334331A
Application number: CN202310339605.2A
Authority: CN
Inventors: 周卓林; 冯晶; 姜庆伟; 邱建红
Original assignee: Hunan Deusino Wear Resistant Industry Co ltd
Current assignee: Hunan Deusino Wear Resistant Industry Co ltd
Priority date: 2023-03-31
Filing date: 2023-03-31
Publication date: 2023-06-27

Abstract

The invention relates to a blast furnace tuyere device, a tuyere small sleeve, a tuyere medium sleeve and an energy-saving method thereof, wherein the outer peripheral surface of the tuyere small sleeve extending into a blast furnace and the end surface of an outlet are provided with a first rare earth tantalate ceramic thermal barrier coating, or the outer peripheral surface of the tuyere small sleeve extending into the blast furnace and the end surface of the outlet are sequentially provided with the first rare earth tantalate ceramic thermal barrier coating and an ultrahigh temperature wear-resistant coating; through setting up the thermal barrier coating at the outer peripheral face and the export terminal surface of wind gap cover, can separate the heat and give circulating cooling water through the body conduction of wind gap cover to reduce the heat loss, the output heat of wind gap cover reduces under the separation of thermal barrier coating simultaneously, required cooling water volume and water supply pressure also reduce, consequently can reduce the heat that the wind gap cover cooling water took away and the power consumption of wind gap cover high pressure water supply, realize energy-conservation, reduce cost, reduce the probability that the wind gap cover was ablated, extension wind gap cover life avoids the unplanned damping down.

Description

Blast furnace tuyere device, tuyere small sleeve, tuyere medium sleeve and energy-saving method thereof

Technical Field

The invention relates to the technical field of blast furnace smelting, in particular to a blast furnace tuyere device, a tuyere small sleeve, a tuyere medium sleeve and an energy-saving method.

Background

The existing iron-smelting blast furnace utilizes the tuyere to convey hot air into the furnace, and because the installation fixing point of the blast furnace tuyere is arranged outside the furnace shell, the furnace wall is thicker, three layers of tuyere sleeves are required to be arranged to extend into the furnace from outside the furnace shell, and the three layers of tuyere sleeves are respectively a large tuyere sleeve, a middle tuyere sleeve and a small tuyere sleeve from outside to inside. The tuyere medium sleeve is in a frustum tubular shape and is fixedly connected with the furnace body, the tuyere medium sleeve is in a frustum tubular shape and is hermetically sleeved in a tuyere large sleeve hole, the tuyere small sleeve is in a frustum tubular shape and is hermetically sleeved in a tuyere medium sleeve hole, the front end of the tuyere medium sleeve and the tuyere small sleeve partially extend into the furnace body of the blast furnace, the tuyere medium sleeve and the tuyere small sleeve are provided with cooling water cavities, each of the tuyere medium sleeve and the tuyere small sleeve is provided with an independent water supply cooling system, the blast furnace tuyere is used for feeding hot air into the blast furnace, the working environment of the tuyere small sleeve is extremely bad during operation, the theoretical combustion temperature of the front end of the tuyere small sleeve is up to 2000 ℃, the temperature of the melt of the reaction product (slag iron) in the blast furnace is above 1500 ℃, the front end part of the tuyere small sleeve air supply channel is arranged in the tuyere and extends into the furnace to be contacted with the slag iron in the furnace, and because the tuyere small sleeve of the blast furnace is inserted into the furnace and needs to bear the high temperature in the furnace, the outlet end part of the tuyere small sleeve is also in direct contact with the high temperature in the furnace, the tuyere small sleeve and the tuyere small sleeve are both designed with cooling water cavities for water cooling, and the common tuyere small sleeve and the tuyere small sleeve are all made of pure red copper for improving the cooling strength and the cooling effect. The area of the tuyere small sleeve which directly contacts with the high temperature in the furnace is larger, the cooling water required by the tuyere small sleeve is larger, the taken away heat energy is huge, and the cooling water in the tuyere sleeve also takes away a lot of heat.

Meanwhile, the hot air temperature heated from the hot air furnace reaches 1100-1400 ℃, the air port small sleeve is directly connected through the belly pipe, and when ultrahigh-temperature hot air passes through the inner hole channel of the air port small sleeve, a large amount of heat is conducted and output through the inner wall of the channel and is taken away by cooling water.

The high-pressure industrial pure cooling water quantity required by the tuyere small sleeve is large, and the driving energy consumed by water supply is also large.

The tuyere small sleeve is inserted into the high-temperature furnace, slag iron is accumulated before the tuyere, and the tuyere small sleeve is easy to burn. Or the high-temperature slag iron drops on the shell of the tuyere small sleeve to burn or burn the tuyere small sleeve. In addition, the coal dust scour is easy to wear out the inner hole outlet section of the small sleeve, and under the action of the factors, the small sleeve is damaged in advance when the service life of the small sleeve is not reached, and the initiation of unscheduled damping down is a major contraindication of blast furnace production, so that the significance of reducing the damage of the tuyere is great.

At present, in order to reduce the burning loss of the tuyere small sleeve, zrO is adopted in some schemes ₂ The thermal barrier coating is sprayed on the tuyere small sleeve by 0.05 mm-0.1 mm, the thermal conductivity coefficient is about 2.0W/(m.K), the speed of preventing the heat of high-temperature slag iron dropping on the tuyere small sleeve shell from being conducted to the surface of the tuyere small sleeve red copper is greatly slowed down by utilizing the thermal barrier, so as to achieve the purpose of preventing burning, however, the most used thermal barrier coating material at present is a zirconia-based material, which can generate phase change at the high temperature of about 1200 ℃ to cause the coating to fall off and fail, thus ZrO ₂ The thermal barrier coating is difficult to continuously and stably work under the working condition of the tuyere small sleeve at 1400-1600 ℃, and can be completely peeled off to lose efficacy after about 3-4 months, and in addition, the thick layer ZrO is more than 0.1mm ₂ The ceramic can be peeled off rapidly under the working condition, the thermal conduction is prevented by an excessively thin thermal barrier layer, and the ZrO is difficult to continuously and stably work ₂ The ceramic is not suitable for being used as a tuyere small sleeve coating in an energy-saving scheme.

At a distance of 3200m ³ The blast furnace is provided with 32 sets of blast furnace tuyere devices, wherein the cooling water quantity of each of 32 tuyere small sleeves is 35t/h, the normal inlet-outlet temperature difference of a cooling water cavity of the tuyere small sleeve is 6-8 ℃, the average temperature is 7 ℃, the absorption heat quantity is 1000kcal/t when the cooling water is increased by 1 ℃, and the heat value of metallurgical coke of the blast furnace is 8000 multiplied by 10 ³ The combustion completion rate of the blast furnace coke is 70% per ton, the heat taken by the cooling water in one year is equivalent to the energy of 12000 tons of metallurgical coke, the price of the metallurgical coke is calculated according to 0.3 ten thousand yuan per ton, and the heat value taken by the cooling water in 1 year is up to 3600 ten thousand yuan (namely 35t/h multiplied by 24h multiplied by 7 ℃ multiplied by 1000kcal/t multiplied by 360d multiplied by 32 multiplied by 8000 multiplied by 10) ³ kcal/t/70% = 12096t,12096t x 0.3 ten thousand yuan/t = 3628 ten thousand yuan), in addition, the small sleeve cooling water supply system of the tuyere is high-pressure water supply, the power of the motor is 1250kVA, the load rate is calculated according to 75%, the power consumption in 1 year is 810 ten thousand yuan, the electricity price is calculated according to 0.5 yuan/degree, the value is 400 ten thousand yuan, (namely 1250kVA multiplied by 75 percent multiplied by 24h multiplied by 360 d/10000=810 ten thousand yuan, 810 ten thousand yuan multiplied by 0.5 yuan/degree=400 ten thousand yuan).

The cooling water quantity of each of the 32 tuyere sleeves is 20t/h, the normal inlet-outlet temperature difference of the tuyere sleeves is 2-4 ℃, and the average temperature is 3 ℃, so that the heat taken by the cooling water in one year is equivalent to the energy of about 3000t of metallurgical coke, and the heat value taken by the cooling water in 1 year is about 900 ten thousand yuan, namely (20 t/h multiplied by 24h multiplied by 3 ℃ multiplied by 1000kcal/t multiplied by 360d multiplied by 32 multiplied by 8000 multiplied by 10) ³ kcal/t/70% = 2962t,2962t x 0.3 ten thousand yuan/t= 888.6 ten thousand yuan), unlike the tuyere small sleeve, the cooling water supply system of the tuyere medium sleeve is low-pressure water supply, and the motor has low power and no energy-saving value.

Therefore, the energy value of heat taken away by the cooling water in the tuyere small sleeve and the tuyere medium sleeve and the energy value of power consumption of high-pressure water supply of the tuyere small sleeve are high, so that how to reduce the energy value of heat taken away by the cooling water in the tuyere small sleeve and the tuyere medium sleeve and the power consumption of the high-pressure water supply of the tuyere small sleeve, reduce the cost, solve the problems of ablation and short service life of the tuyere small sleeve and the tuyere medium sleeve, and avoid unplanned damping down, thereby becoming an important technical problem to be solved urgently by the technicians in the field.

Disclosure of Invention

The first object of the invention is to provide a tuyere small sleeve, which is used for reducing the heat energy taken away by cooling water of the tuyere small sleeve and the power consumption of high-pressure water supply of the tuyere small sleeve, reducing the cost, solving the problems of ablation and short service life of the tuyere small sleeve and avoiding unplanned damping down.

The second object of the invention is to provide a tuyere medium sleeve, which is used for reducing the heat energy taken away by cooling water of the tuyere medium sleeve, reducing the cost, solving the problems of ablation and short service life of a tuyere small sleeve and avoiding unscheduled damping down.

A third object of the present invention is to provide a tuyere device for a blast furnace based on the tuyere small sleeve and the tuyere medium sleeve.

A fourth object of the present invention is to provide an energy saving method based on the above-mentioned tuyere device of a blast furnace.

In order to achieve the above purpose, the present invention provides the following technical solutions:

the tuyere small sleeve is provided with a first rare earth tantalate ceramic thermal barrier coating with the thickness not smaller than 0.1mm, which stretches into the outer peripheral surface of the blast furnace, or is provided with a first rare earth tantalate ceramic thermal barrier coating with the thickness not smaller than 0.1mm and a first ultrahigh-temperature wear-resistant coating with the thickness not smaller than 0.1mm, which stretches into the outer peripheral surface of the blast furnace, and the outlet end face.

Optionally, the wall surface of the air supply channel of the air port small sleeve is provided with a second rare earth tantalate ceramic thermal barrier coating with the thickness not smaller than 0.1mm, or the wall surface of the air supply channel of the air port small sleeve is sequentially provided with a second rare earth tantalate ceramic thermal barrier coating with the thickness not smaller than 0.1mm and a second ultrahigh temperature wear-resistant coating with the thickness not smaller than 0.1 mm.

Optionally, a transition layer with the thickness of 0.1-0.2 mm is arranged among the outer peripheral surface and the outlet end surface of the tuyere small sleeve and the first rare earth tantalate ceramic thermal barrier coating, and a transition layer with the thickness of 0.1-0.2 mm is arranged between the wall surface of the air supply channel of the tuyere small sleeve and the second rare earth tantalate ceramic thermal barrier coating.

Optionally, a basic coating is arranged between the first rare earth tantalate ceramic thermal barrier coating and the transition layer, and the basic coating at least comprises a yttria-stabilized zirconia coating;

and/or a basic coating is arranged between the second rare earth tantalate ceramic thermal barrier coating and the transition layer, and the basic coating at least comprises a yttria-stabilized zirconia coating.

Optionally, the base coating comprises a plurality of layers of yttria-stabilized zirconia coatings and a plurality of layers of third rare earth tantalate ceramic thermal barrier coatings, and each yttria-stabilized zirconia coating and each third rare earth tantalate ceramic thermal barrier coating are sequentially and alternately overlapped.

Optionally, a transition layer with the thickness of 0.1-0.2 mm is arranged between the first rare earth tantalate ceramic thermal barrier coating and the first ultra-high temperature wear-resistant coating;

and/or a transition layer with the thickness of 0.1-0.2 mm is arranged between the second rare earth tantalate ceramic thermal barrier coating and the second ultrahigh temperature wear-resistant coating.

Optionally, the first rare earth tantalate ceramic thermal barrier coating is rare earth tantalate RETaO ₄ Single layer coating, rare earth tantalate RE ₃ TaO ₇ +RETaO ₄ Double-layer coating and rare earth tantalate RE ₃ TaO ₇ +RETa ₃ O ₉ +RETaO ₄ One of the three layers of coating; the second rare earth tantalate ceramic thermal barrier coating is rare earth tantalate RETaO ₄ Single layer coating, rare earth tantalate RE ₃ TaO ₇ +RETaO ₄ Double-layer coating and rare earth tantalate

RE ₃ TaO ₇ +RETa ₃ O ₉ +RETaO ₄ One of the three layers of coating.

Optionally, the first ultra-high temperature wear-resistant coating is one of a SiC coating, a SiN coating, and a Ni-based WC coating; the second ultra-high temperature wear-resistant coating is one of a SiC coating, a SiN coating and a Ni-based WC coating.

The utility model provides a cover in wind gap, the export terminal surface of cover sets up the fourth rare earth tantalate ceramic thermal barrier coating that thickness is not less than 0.1mm in the wind gap, or the export terminal surface of cover sets gradually the fourth rare earth tantalate ceramic thermal barrier coating that thickness is not less than 0.1mm and the third super high temperature wear-resisting coating that thickness is not less than 0.1mm in the wind gap.

Optionally, a transition layer with the thickness of 0.1-0.2 mm is arranged between the outlet end face of the tuyere medium sleeve and the fourth rare earth tantalate ceramic thermal barrier coating.

Optionally, a basic coating is arranged between the fourth rare earth tantalate ceramic thermal barrier coating and the transition layer, and the basic coating at least comprises a yttria-stabilized zirconia coating.

Optionally, the base coating comprises a plurality of layers of yttria-stabilized zirconia coatings and a plurality of layers of fifth rare earth tantalate ceramic thermal barrier coatings, and each yttria-stabilized zirconia coating and each fifth rare earth tantalate ceramic thermal barrier coating are sequentially and alternately overlapped.

Optionally, a transition layer with the thickness of 0.1-0.2 mm is arranged between the fourth rare earth tantalate ceramic thermal barrier coating and the ultra-high temperature wear-resistant coating.

Optionally, the fourth rare earth tantalate ceramic thermal barrier coating is rare earth tantalate RETaO ₄ Single layer coating, rare earth tantalate RE ₃ TaO ₇ +RETaO ₄ Double-layer coating and rare earth tantalate RE ₃ TaO ₇ +RETa ₃ O ₉ +RETaO ₄ One of the three layers of coating.

Optionally, the third ultra-high temperature wear resistant coating is one of a SiC coating, a SiN coating, and a Ni-based WC coating.

A blast furnace tuyere device, comprising a tuyere large sleeve, a tuyere medium sleeve and a tuyere small sleeve which are sequentially connected, wherein the tuyere small sleeve is the tuyere small sleeve according to any one of the above, and the tuyere medium sleeve is the tuyere medium sleeve according to any one of the above.

An energy-saving method for a blast furnace tuyere device, comprising the steps of:

the method comprises the steps that a first rare earth tantalate ceramic thermal barrier coating with the thickness not smaller than 0.1mm is arranged on the outer peripheral surface of a tuyere small sleeve of a blast furnace tuyere device, which stretches into a blast furnace, and on the end face of an outlet, or a first rare earth tantalate ceramic thermal barrier coating with the thickness not smaller than 0.1mm and a first ultrahigh-temperature wear-resistant coating with the thickness not smaller than 0.1mm are sequentially arranged on the outer peripheral surface of the tuyere small sleeve of the blast furnace tuyere device, which stretches into the blast furnace, and on the end face of the outlet;

Measuring the temperature of the inlet and outlet cooling water of the cooling water cavity of the tuyere small sleeve at the initial stage and obtaining the initial temperature difference of the inlet and outlet cooling water of the tuyere small sleeve, measuring the temperature of the inlet and outlet cooling water of the cooling water cavity of the tuyere small sleeve in real time in the use process and obtaining the real-time temperature difference of the inlet and outlet cooling water of the tuyere small sleeve, and replacing the tuyere small sleeve if the difference between the real-time temperature difference of the inlet and outlet cooling water of the tuyere small sleeve and the initial temperature difference of the inlet and outlet cooling water of the tuyere small sleeve is larger than a preset value under the same working condition.

the method comprises the steps that a first rare earth tantalate ceramic thermal barrier coating with the thickness not smaller than 0.1mm is arranged on the outer peripheral surface of a tuyere small sleeve of a blast furnace tuyere device, which stretches into a blast furnace, and a second rare earth tantalate ceramic thermal barrier coating with the thickness not smaller than 0.1mm is arranged on the wall surface of an air supply channel of the tuyere small sleeve of the blast furnace tuyere device, or a first rare earth tantalate ceramic thermal barrier coating with the thickness not smaller than 0.1mm and a first ultrahigh-temperature wear-resistant coating with the thickness not smaller than 0.1mm are sequentially arranged on the outer peripheral surface of the tuyere small sleeve of the blast furnace tuyere device, which stretches into the blast furnace, and a second ultrahigh-temperature wear-resistant coating with the thickness not smaller than 0.1mm is sequentially arranged on the wall surface of the air supply channel of the tuyere small sleeve of the blast furnace tuyere device;

the method comprises the steps that a fourth rare earth tantalate ceramic thermal barrier coating with the thickness not smaller than 0.1mm is arranged on the outlet end face of a tuyere medium sleeve of a blast furnace tuyere device, or a fourth rare earth tantalate ceramic thermal barrier coating with the thickness not smaller than 0.1mm and a third ultrahigh temperature wear-resistant coating with the thickness not smaller than 0.1mm are sequentially arranged on the outlet end face of the tuyere medium sleeve of the blast furnace tuyere device;

measuring the temperature of the inlet and outlet cooling water of the cooling water cavity of the middle sleeve of the tuyere at the initial stage, and obtaining the initial temperature difference of the inlet and outlet cooling water of the middle sleeve of the tuyere, measuring the temperature of the inlet and outlet cooling water of the cooling water cavity of the middle sleeve of the tuyere in real time in the use process, and obtaining the real-time temperature difference of the inlet and outlet cooling water of the middle sleeve of the tuyere, wherein if the difference of the real-time temperature difference of the inlet and outlet cooling water of the middle sleeve of the tuyere and the initial temperature difference of the inlet and outlet cooling water of the middle sleeve of the tuyere is larger than a preset value under the same working condition, the middle sleeve of the tuyere is replaced.

measuring the temperature of the inlet and outlet cooling water of the cooling water cavity of the tuyere small sleeve at the initial stage and obtaining the initial temperature difference of the inlet and outlet cooling water of the tuyere small sleeve, measuring the temperature of the inlet and outlet cooling water of the cooling water cavity of the tuyere small sleeve in real time and obtaining the real-time temperature difference of the inlet and outlet cooling water of the tuyere small sleeve in the use process, and if the difference value between the real-time temperature difference of the inlet and outlet cooling water of the tuyere small sleeve and the initial temperature difference of the inlet and outlet cooling water of the tuyere small sleeve is larger than a preset value under the same working condition, replacing the tuyere small sleeve;

the method comprises the steps that a first rare earth tantalate ceramic thermal barrier coating with the thickness not smaller than 0.1mm is arranged on the outer peripheral surface of a tuyere small sleeve of a blast furnace tuyere device, which stretches into a blast furnace, and a second rare earth tantalate ceramic thermal barrier coating with the thickness not smaller than 0.1mm is arranged on the wall surface of an air supply channel of the tuyere small sleeve of the blast furnace tuyere device, or a first rare earth tantalate ceramic thermal barrier coating with the thickness not smaller than 0.1mm and an ultra-high temperature wear-resistant coating with the thickness not smaller than 0.1mm are sequentially arranged on the outer peripheral surface of the tuyere small sleeve of the blast furnace tuyere device, which stretches into the blast furnace, and an ultra-high temperature wear-resistant coating with the thickness not smaller than 0.1mm is sequentially arranged on the wall surface of the air supply channel of the tuyere small sleeve of the blast furnace tuyere device;

According to the technical scheme, the invention discloses the tuyere small sleeve, wherein the tuyere small sleeve stretches into the outer peripheral surface in the blast furnace and the outlet end face of the tuyere small sleeve are provided with the first rare earth tantalate ceramic thermal barrier coating with the thickness not smaller than 0.1mm, or the tuyere small sleeve stretches into the outer peripheral surface in the blast furnace and the outlet end face of the tuyere small sleeve are sequentially provided with the first rare earth tantalate ceramic thermal barrier coating with the thickness not smaller than 0.1mm and the first ultrahigh-temperature wear-resistant coating with the thickness not smaller than 0.1 mm; the outer peripheral surface and the outlet end surface of the tuyere small sleeve are the main contact surfaces extending into the blast furnace and also the main heat absorbing surfaces, the rare earth tantalate ceramic thermal barrier coating is an ultra-high temperature thermal barrier coating which can be permanently stabilized under the working condition of 1400-1600 ℃, has the performance of stabilizing the working at the temperature of more than 2600 ℃ for a short time (1 h) and more than 1600 ℃ for a long time (12000 h-16000 h), and can prevent heat from being conducted to circulating cooling water from the blast furnace at the temperature of 1400-1600 ℃ through the body of the tuyere small sleeve by arranging the first rare earth tantalate ceramic thermal barrier coating on the outer peripheral surface and the outlet end surface of the tuyere small sleeve, thereby greatly reducing heat loss, and simultaneously greatly reducing the output heat of the tuyere small sleeve under the blocking of the first rare earth tantalate ceramic thermal barrier coating, the required cooling water quantity is also greatly reduced, and the required water supply pressure is also reduced, so that the heat energy taken away by the cooling water of the tuyere small sleeve and the power consumption of the high-pressure water supply of the tuyere small sleeve can be reduced, the energy conservation and the cost reduction are realized, and it is expected that the first rare earth tantalate ceramic thermal barrier coating is easily worn in dust air supply operation, the wear of the first rare earth tantalate ceramic thermal barrier coating can reduce the heat blocking capacity of the first rare earth tantalate ceramic thermal barrier coating, and in order to enable the first rare earth tantalate ceramic thermal barrier coating to have certain wear resistance, the thickness of the rare earth tantalate ceramic thermal barrier coating can be increased to be more than 0.6mm in a thickness increasing manner, and when the first rare earth tantalate ceramic thermal barrier coating is worn to be replaced by 0.2mm, the wear condition of the first rare earth tantalate ceramic thermal barrier coating is obtained by detecting the temperature difference of inlet and outlet cooling water under the same working condition; or a first ultra-high temperature wear-resistant coating can be added on the first rare earth tantalate ceramic thermal barrier coating to protect the first rare earth tantalate ceramic thermal barrier coating so as to keep the lasting and high efficiency of the heat blocking performance, and when the tuyere small sleeve is replaced, the first rare earth tantalate ceramic thermal barrier coating still has 0.2mm, the probability that the tuyere small sleeve is ablated is extremely low, so that the service life of the tuyere small sleeve is prolonged, and unplanned damping down is avoided.

The invention also provides a tuyere medium sleeve, a blast furnace tuyere device and an energy saving method thereof, which have similar technical effects to those of the tuyere small sleeve and are not repeated herein.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a cross-sectional view of a tuyere small sleeve provided by an embodiment of the present invention;

FIG. 2 is an enlarged schematic view of a portion of FIG. 1 at A;

FIG. 3 is a cross-sectional view of a tuyere small sleeve provided in another embodiment of the present invention;

FIG. 4 is an enlarged partial schematic view at B in FIG. 3;

FIG. 5 is a cross-sectional view of a tuyere small sleeve provided in yet another embodiment of the present invention;

FIG. 6 is an enlarged partial schematic view of FIG. 5C;

FIG. 7 is a cross-sectional view of a tuyere medium sleeve provided in an embodiment of the present invention;

Fig. 8 is a schematic structural view of a tuyere device of a blast furnace according to an embodiment of the present invention.

In the figure:

1 is a tuyere small sleeve; 101 is the outer peripheral surface of the tuyere small sleeve; 102 is the outlet end face of the tuyere small sleeve; 103 is the wall surface of the air supply channel of the tuyere small sleeve; 2a is a first rare earth tantalate ceramic thermal barrier coating; 2b is a second rare earth tantalate ceramic thermal barrier coating; 2c is a fourth rare earth tantalate ceramic thermal barrier coating; 3a is a first ultra-high temperature wear-resistant coating; 3b is a second ultra-high temperature wear resistant coating; 3c is a third ultra-high temperature wear-resistant coating; 4 is a tuyere medium sleeve; 401 is the outlet end face of the tuyere medium sleeve; 402 is the outer peripheral surface of the tuyere medium sleeve; and 5 is a tuyere large sleeve.

Detailed Description

The first core of the invention is to provide the tuyere small sleeve, which has the structural design that the water resource waste can be reduced, the waste heat in the slag can be recovered, the energy utilization rate can be improved, the slag generation amount can be reduced, the subsequent treatment and transportation can be facilitated, and meanwhile, the separation of the slag and the metal can be facilitated.

The second core of the invention is to provide the tuyere medium sleeve to reduce the heat energy taken away by the cooling water of the tuyere medium sleeve, reduce the cost, solve the problems of ablation and short service life of the tuyere small sleeve, and avoid the unplanned damping down.

The third core of the invention is to provide a blast furnace tuyere device based on the tuyere small sleeve and the tuyere medium sleeve.

The fourth core of the invention is to provide an energy-saving method based on the blast furnace tuyere device.

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Referring to fig. 1 and 2, fig. 1 is a cross-sectional view of a tuyere small sleeve according to an embodiment of the present invention, fig. 2 is a partially enlarged schematic view of a portion a in fig. 1, fig. 3 is a cross-sectional view of a tuyere small sleeve according to another embodiment of the present invention, and fig. 4 is a partially enlarged schematic view of a portion B in fig. 3.

The embodiment of the invention discloses a tuyere small sleeve 1, wherein the tuyere small sleeve 1 stretches into the outer peripheral surface 101 in a blast furnace and the outlet end face 102 to be provided with a first rare earth tantalate ceramic thermal barrier coating 2a with the thickness not smaller than 0.1mm, or the outer peripheral surface 101 in the blast furnace and the outlet end face 102 of the tuyere small sleeve 1 stretch into the blast furnace to be provided with the first rare earth tantalate ceramic thermal barrier coating 2a with the thickness not smaller than 0.1mm and a first ultrahigh temperature wear-resistant coating 3a with the thickness not smaller than 0.1mm in sequence.

In order to improve the cooling strength and the cooling effect, the common tuyere small sleeve 1 is made of pure red copper, the outer peripheral surface 101 and the outlet end surface 102 of the tuyere small sleeve 1 are main contact surfaces extending into a blast furnace and are main heat absorbing surfaces, and the rare earth tantalate ceramic coating is the only thermal barrier coating capable of stably working for a long time at 1400-1600 ℃ at present and has the performance of stably working for a short time (1 h) above 2600 ℃ and for a long time (12000 h-16000 h) above 1600 ℃.

The wall thickness of the tuyere small sleeve 1 adopting red copper is about 15mm, the wear in the use process is thinner, the temperature difference of the inlet and outlet water temperatures of a cooling water cavity of the tuyere small sleeve 1 is generally 6-8 ℃, the heat conductivity coefficient of red copper is 407W/(m.K), the heat conductivity coefficient of the first rare earth tantalate ceramic thermal barrier coating 2a is 1.2W/(m.K), when the thickness of the first rare earth tantalate ceramic thermal barrier coating 2a is 0.02mm, the heat loss of the part can be theoretically prevented from being reduced by 31%, when the thickness of the first rare earth tantalate ceramic thermal barrier coating 2a is 0.05mm, the heat loss of the part can be theoretically prevented from being reduced by 53%, when the temperature difference of the cooling water cavity inlet and outlet water temperature of the tuyere small sleeve 1 is 0.1mm, the heat loss of the part can be theoretically prevented from being reduced by 69%, in the list type calculated from the lower surface, the effect is smaller and smaller, when the thickness of the first rare earth tantalate ceramic thermal barrier coating 2a is 0.2mm, the thickness is preferably 0.2mm, the thickness of the residual coating is the thickness of the scheme is 0.05mm, the heat loss of the part is reduced by 53%, the heat loss is prevented from being reduced by 53%, the heat loss of the part is gradually reduced by the heat loss of the first rare earth tantalate ceramic thermal barrier coating, and the material is more convenient to be replaced when the tuyere is more energy-saving, the tuyere is more energy-efficient, and the tuyere is more convenient, and the tuyere is worn, and the abrasion and more has the energy-saving effect and has the energy-saving effect.

【0.6mm×407W/(m·K)÷1.2W/(m·K)】/【0.6mm×407W/(m·K)÷1.2W/(m·K)+15mm】＝93％

【0.5mm×407W/(m·K)÷1.2W/(m·K)】/【0.5mm×407W/(m·K)÷1.2W/(m·K)+15mm】＝0.92％

【0.4mm×407W/(m·K)÷1.2W/(m·K)】/【0.4mm×407W/(m·K)÷1.2W/(m·K)+15mm】＝90％

【0.3mm×407W/(m·K)÷1.2W/(m·K)】/【0.3mm×407W/(m·K)÷1.2W/(m·K)+15mm】＝87％

【0.2mm×407W/(m·K)÷1.2W/(m·K)】/【0.2mm×407W/(m·K)÷1.2W/(m·K)+15mm】＝82％

【0.1mm×407W/(m·K)÷1.2W/(m·K)】/【0.1mm×407W/(m·K)÷1.2W/(m·K)+15mm】＝69％

【0.05mm×407W/(m·K)÷1.2W/(m·K)】/【0.05mm×407W/(m·K)÷1.2W/(m·K)+15mm】＝53％

【0.02mm×407W/(m·K)÷1.2W/(m·K)】/【0.02mm×407W/(m·K)÷1.2W/(m·K)+15mm】＝31％

Since the heat absorption of the outer peripheral surface 101 of the tuyere small sleeve 1 extending into the blast furnace and the outlet end surface 102 accounts for 70% of the tuyere small sleeve 1, the inner wall 103 of the air supply channel accounts for 25% and the rest accounts for 5%, if the operation of spraying the first rare earth tantalate ceramic thermal barrier coating 2a on the outer peripheral surface 101 of the tuyere small sleeve 1 extending into the blast furnace and the outlet end surface 102 is kept above 0.2mm, 82% ×70% =57.4% of the energy loss of the tuyere small sleeve 1 can be reduced, abrasion is carried out from 0.6mm to 0.2mm, the average heat loss at the position is roughly calculated as (82% +87% +90% +92% +93%)/5=88.8%, 62% of the energy loss of the tuyere small sleeve 1 can be reduced, if the air supply channel wall 103 is added, 84% (88.8% ×95%), other factors can be theoretically adjusted and the implementation of the scheme can reduce the energy loss of the tuyere small sleeve 1 by 84% (88.8% ×95% =84% =4%), and the implementation of the scheme can reduce the energy loss of the tuyere small sleeve 1 by 70% =4% =71% (88.8%).

When the tuyere small sleeve 1 provided by the embodiment of the invention is used, if the temperature difference between the inlet and the outlet of cooling water is still controlled at 6-8 ℃, the water supply amount can be reduced by 70%, the flow rate of the cooling water can be reduced by 70%, the theoretical water supply power can be reduced by 90%, and the water supply power can be reduced by 3200m when the cooling water heat absorption of the tuyere small sleeve 1 is greatly reduced by 70% ³ For example, the water supply configuration motor of the primary tuyere small sleeve 1 is 1250kVA, and the load rate is 75 percent per hourPower can be saved by 1250kVA x 0.75% x90% = 843.7Kw.

The invention can estimate the energy saving by 3200m ³ For example, the blast furnace can reduce the heat loss of cooling water all the year round, the energy saving can be calculated to be 3600 ten thousand yuan x 70% +400 ten thousand yuan x 90% +900 ten thousand yuan x 57% = 3393 ten thousand/year, the on-site uncontrollable factors can not be considered to completely realize the high-efficiency energy-saving state, and the energy saving fund can reach 2500-3000 ten thousand yuan/year.

In summary, compared with the prior art, the tuyere small sleeve 1 provided by the embodiment of the invention can prevent heat from being conducted to circulating cooling water from 1400 ℃ to 1600 ℃ in a blast furnace through the body of the tuyere small sleeve 1 by arranging the first rare earth tantalate ceramic thermal barrier coating 2a on the outer peripheral surface 101 and the outlet end surface 102, so that heat loss is greatly reduced, meanwhile, the output heat of the tuyere small sleeve 1 is greatly reduced under the blocking of the first rare earth tantalate ceramic thermal barrier coating 2a, the required cooling water quantity is also greatly reduced, the required water supply pressure is also reduced, therefore, the heat energy taken away by the cooling water of the tuyere small sleeve 1 and the power consumption of high-pressure water supply of the tuyere small sleeve 1 can be reduced, the energy conservation and the cost reduction can be realized, and the abrasion of the first rare earth tantalate ceramic thermal barrier coating 2a in dust-carrying air supply operation can be expected to lead the heat blocking capacity to be reduced, and in order to lead the first rare earth tantalate ceramic thermal barrier coating 2a to have a certain abrasion-resistant capacity, and the thickness of the first rare earth tantalate ceramic thermal barrier coating 2a can be increased to be adjusted to be more than 0.6mm or less than 0.0 mm; or the first ultra-high temperature wear-resistant coating 3a can be added on the first rare earth tantalate ceramic thermal barrier coating 2a, so that the first rare earth tantalate ceramic thermal barrier coating 2a is protected to keep lasting and high efficiency of heat blocking performance, the wear condition of the first rare earth tantalate ceramic thermal barrier coating 2a or the first rare earth tantalate ceramic thermal barrier coating 2a and the first ultra-high temperature wear-resistant coating 3a is obtained by detecting the inlet and outlet cooling water temperature difference under the same working condition, and therefore, when the tuyere small sleeve 1 is replaced, the thickness of the first rare earth tantalate ceramic thermal barrier coating 2a still has 0.2mm, so that the heat blocking thickness of the first rare earth tantalate ceramic thermal barrier coating 2a can be ensured to be enough over a certain period of time (such as a minimum of 6 months is preferred, and a maximum of 12 months is preferred), energy conservation and high efficiency within a long time is kept, the probability of being ablated by the tuyere small sleeve 1 is extremely low, and the service life of the tuyere small sleeve 1 is prolonged, and unplanned wind is avoided.

In addition to the outer surface of the tuyere small sleeve 1, hot air at 1100-1400 ℃ is blown into the blast furnace through the air supply channel wall surface 103 of the tuyere small sleeve 1, high-temperature hot air is in contact with the hole wall of the air supply channel wall surface 103 of the tuyere small sleeve 1, heat is conducted to circulating cooling water through the tuyere small sleeve 1 to run off, the heat absorption quantity of the outer peripheral surface and the outlet end surface of the tuyere small sleeve 1 extending into the blast furnace accounts for 70% of the air supply channel wall surface 103 of the tuyere small sleeve 1, and the rest accounts for 5%, so in another embodiment of the invention, the air supply channel wall surface 103 of the tuyere small sleeve 1 is provided with a second rare earth tantalate ceramic thermal barrier coating 2b with the thickness not less than 0.1mm, or the air supply channel wall surface 103 of the tuyere small sleeve 1 is sequentially provided with a second rare earth tantalate ceramic thermal barrier coating 2b with the thickness not less than 0.1mm and a second ultra-high-temperature wear-resistant coating 3b with the thickness not less than 0.1 mm.

Preferably, in the embodiment of the present invention, as shown in fig. 5 and 6, a transition layer with a thickness of 0.1mm to 0.2mm is provided between the outer peripheral surface 101, the outlet end surface 102 and the first rare earth tantalate ceramic thermal barrier coating 2a of the tuyere small sleeve 1, and a thickness of 0.1mm is provided between the wall surface 103 of the air supply passage of the tuyere small sleeve and the second rare earth tantalate ceramic thermal barrier coating 2b

In addition, in order to prevent the first rare earth tantalate ceramic thermal barrier coating 2a or the second rare earth tantalate ceramic thermal barrier coating 2b from losing efficacy, the total thickness of the first rare earth tantalate ceramic thermal barrier coating 2a or the second rare earth tantalate ceramic thermal barrier coating 2b is increased to 0.6mm, and the first rare earth tantalate ceramic thermal barrier coating 2a or the second rare earth tantalate ceramic thermal barrier coating 2b which is too thick is easy to peel off, so that the first rare earth tantalate ceramic thermal barrier coating 2a or the second rare earth tantalate ceramic thermal barrier coating 2b and the transition layer can be alternately coated, namely, the mode of overlapping the rare earth tantalate ceramic thermal barrier coating thin layers (0.1 mm) +the transition layer (0.1 mm) is adopted, the apparent total thickness is increased to 1.2mm, and the thickness of the transition layer is not counted into the thickness of the rare earth tantalate ceramic thermal barrier coating.

Preferably, in the embodiment of the invention, in order to reduce the cost, a basic coating is arranged between the first rare earth tantalate ceramic thermal barrier coating 2a and the transition layer, and the basic coating at least comprises a layer of yttria-stabilized zirconia coating; and/or a basic coating is arranged between the second rare earth tantalate ceramic thermal barrier coating 2b and the transition layer, and the basic coating at least comprises a yttria-stabilized zirconia coating.

Further, the base coating comprises a plurality of layers of yttria-stabilized zirconia coatings and a plurality of layers of third rare earth tantalate ceramic thermal barrier coatings, and each yttria-stabilized zirconia coating and each third rare earth tantalate ceramic thermal barrier coating are sequentially and alternately overlapped.

Further optimizing the above technical scheme, in the embodiment of the invention, a transition layer with the thickness of 0.1 mm-0.2 mm is arranged between the first rare earth tantalate ceramic thermal barrier coating 2a and the first ultra-high temperature wear-resistant coating 3a, and/or a transition layer with the thickness of 0.1 mm-0.2 mm is arranged between the second rare earth tantalate ceramic thermal barrier coating 2b and the second ultra-high temperature wear-resistant coating 3 b.

The first and second rare earth tantalate ceramic

thermal barrier coatings

2a and 2b include, but are not limited to, rare earth tantalate RETaO ₄ Single layer coating, rare earth tantalate RE ₃ TaO ₇ +RETaO ₄ Double-layer coating and rare earth tantalate

RE ₃ TaO ₇ +RETa ₃ O ₉ +RETaO ₄ The three-layer coating can bear high temperature of 2000-2400 ℃ for a short time (3 h), can keep stable working in high temperature environment of 1500-1600 ℃ for a long time (12000 h-16000 h), has anti-corrosion performance under high temperature oxidation-reduction multi-environment, and has anti-stripping and certain high temperature anti-wear capability.

Preferably, in the embodiment of the present invention, the first ultra-high temperature wear-resistant coating layer 3a includes, but is not limited to, a SiC coating layer, a SiN coating layer, and a Ni-based WC coating layer, and the second ultra-high temperature wear-resistant coating layer 3b includes, but is not limited to, a SiC coating layer, a SiN coating layer, and a Ni-based WC coating layer.

The embodiment of the invention also provides the tuyere medium sleeve 4, as shown in fig. 7, the outlet end face 401 of the tuyere medium sleeve 4 is in contact with the furnace and is the main heat absorbing surface of the tuyere medium sleeve 4, the outlet end face 401 of the tuyere medium sleeve 4 is provided with the fourth rare earth tantalate ceramic thermal barrier coating 2c with the thickness not smaller than 0.1mm, or the outlet end face of the tuyere medium sleeve 4 is sequentially provided with the fourth rare earth tantalate ceramic thermal barrier coating 2c with the thickness not smaller than 0.1mm and the third ultrahigh temperature wear-resistant coating 3c with the thickness not smaller than 0.1mm, so that the heat transmission blocking performance of the fourth rare earth tantalate ceramic thermal barrier coating 2c is kept high-efficient and durable.

The outlet end face 401 of the tuyere medium sleeve 4 accounts for 75% of the total heat absorption of the tuyere medium sleeve 4, the heat absorption of a gap between the outer peripheral face 402 of the tuyere medium sleeve 4 and a furnace wall steel brick accounts for about 20% of the total heat absorption of the tuyere medium sleeve 4, but the gap cannot be used as a thermal barrier coating, because steel slag flows into the gap, rapid cooling and solidification are achieved, the effect of fixing the tuyere medium sleeve 4 is achieved, if the gap is provided with a rare earth tantalate ceramic thermal barrier coating, steel slag solidification is affected, when a large amount of steel slag material impacts the tuyere when the furnace collapses, the tuyere medium sleeve 4 is unstable and shifts, the direction of the tuyere is changed, therefore, the theoretical energy conservation of the tuyere medium sleeve 4 is about 67% (88.8% ×75% =67%) and other factors are used for adjusting and correcting data, and the implementation of the scheme can reduce 57% (67% ×85% =57%) of the energy loss of the tuyere medium sleeve 4.

Preferably, in the embodiment of the invention, a transition layer with the thickness of 0.1 mm-0.2 mm is arranged between the outlet end face 401 of the tuyere medium sleeve 4 and the fourth rare earth tantalate ceramic thermal barrier coating 2c, and the transition layer is AL, cr, ni, co, Y component material.

Preferably, in the embodiment of the present invention, a transition layer with a thickness of 0.1 mm-0.2 mm is disposed between the fourth rare earth tantalate ceramic thermal barrier coating 2c and the third ultra-high temperature wear-resistant coating 3c, and when the thickness of the fourth rare earth tantalate ceramic thermal barrier coating 2c is thicker, the fourth rare earth tantalate ceramic thermal barrier coating 2c may be divided into multiple layers and multiple layers of transition layers alternately stacked, so as to avoid the problem that the excessively thick fourth rare earth tantalate ceramic thermal barrier coating 2c is easy to peel off.

Preferably, in order to reduce the cost, in the embodiment of the invention, a basic coating is arranged between the fourth rare earth tantalate ceramic thermal barrier coating 2c and the transition layer, and the basic coating at least comprises a yttria-stabilized zirconia coating.

Specifically, the basic coating comprises a plurality of layers of yttria-stabilized zirconia coatings and a plurality of layers of fifth rare earth tantalate ceramic thermal barrier coatings, and each yttria-stabilized zirconia coating and each fifth rare earth tantalate ceramic thermal barrier coating are sequentially and alternately overlapped.

The fourth rare earth tantalate ceramic thermal barrier coating 2c includes, but is not limited to, rare earth tantalate RETaO ₄ Single layer coating, rare earth tantalate RE ₃ TaO ₇ +RETaO ₄ Double-layer coating and rare earth tantalate RE ₃ TaO ₇ +RETa ₃ O ₉ +RETaO ₄ The three-layer coating can bear high temperature of 2000-2400 ℃ for a short time (3 h), can keep stable working in high temperature environment of 1500-1600 ℃ for a long time (12000 h-16000 h), has anti-corrosion performance under high temperature oxidation-reduction multi-environment, and has anti-stripping and certain high temperature anti-wear capability.

Preferably, in the embodiment of the present invention, the third ultra-high temperature wear-resistant coating 3c includes, but is not limited to, siC coating, siN coating, and Ni-based WC coating.

The embodiment of the invention also provides a blast furnace tuyere device, which comprises a tuyere large sleeve 5, a tuyere medium sleeve 4 and a tuyere small sleeve 1 which are sequentially connected, wherein the tuyere small sleeve 1 is the tuyere small sleeve 1 according to the embodiment, and the tuyere medium sleeve 4 is the tuyere medium sleeve 4 according to the embodiment, so that the technical effect of the blast furnace tuyere device is that the blast furnace tuyere device is as shown in the embodiment.

In one embodiment of the present invention, there is provided a blast furnace tuyere device energy saving method including the steps of:

S101: the method comprises the steps that a first rare earth tantalate ceramic thermal barrier coating 2a with the thickness not smaller than 0.1mm is arranged on the outer peripheral surface 101 of a tuyere small sleeve 1 of a blast furnace tuyere device, which stretches into a blast furnace, and an outlet end surface 102, or a first rare earth tantalate ceramic thermal barrier coating 2a with the thickness not smaller than 0.1mm and a first ultrahigh-temperature wear-resistant coating 3a with the thickness not smaller than 0.1mm are sequentially arranged on the outer peripheral surface 101 of the tuyere small sleeve 1 of the blast furnace tuyere device, which stretches into the blast furnace, and the outlet end surface 102;

the first rare earth tantalate ceramic thermal barrier coating 2a includes, but is not limited to, rare earth tantalate RETaO ₄ Single layer coating, rare earth tantalate RE ₃ TaO ₇ +RETaO ₄ Double-layer coating and rare earth tantalate RE ₃ TaO ₇ +RETa ₃ O ₉ +RETaO ₄ The thickness of the rare earth tantalate ceramic thermal barrier coating is 0.3mm, the rare earth tantalate ceramic thermal barrier coating can show very ideal heat insulation effect, coal dust and slag iron dust in the furnace wash the peripheral surface 101 and the outlet end surface 102 of the tuyere small sleeve 1 under the action of turbulence, and the effect of these factors ensures that the first rare earth tantalate ceramic thermal barrier coating 2a at the position of the tuyere small sleeve 1 has abrasion and energy-saving efficiency is reduced, so that the coating is increased from effective 0.3mm thickness to 0.6 mm-1 mm thickness by virtue of the ultrahigh temperature abrasion resistance of the first rare earth tantalate ceramic thermal barrier coating 2a, and the allowable abrasion loss of the coating under 0.2mm is increased to 0.4 mm-0.8 mm, so that the saved lasting efficiency is ensured.

It can be understood that the tuyere small sleeve 1 is inserted into the blast furnace, slag iron is accumulated before the tuyere, so that the tuyere small sleeve 1 is easy to burn out, or high-temperature slag iron drops on the upper part of the shell of the tuyere small sleeve 1 to burn out or burn out the tuyere small sleeve 1. The first rare earth tantalate ceramic thermal barrier coating 2a can effectively prevent the tuyere small sleeve 1 from being burnt, but in addition, under the action of turbulence, coal dust and slag iron dust in the furnace wash the outer peripheral surface 101 and the outlet end surface of the tuyere small sleeve 1, and due to the action of the factors, the first rare earth tantalate ceramic thermal barrier coating 2a at the position of the tuyere small sleeve 1 is easy to wear and lose efficacy, and the tuyere small sleeve 1 is damaged in advance when the service life of the section body is not reached, so that unplanned damping down is caused, and the blast furnace production is greatly prohibited.

S102: measuring the temperature of cooling water at the inlet and the outlet of a cooling water cavity of the tuyere small sleeve 1 at the initial stage, obtaining the initial temperature difference of the cooling water at the inlet and the outlet of the tuyere small sleeve 1, measuring the temperature of the cooling water at the inlet and the outlet of the cooling water cavity of the tuyere small sleeve 1 in real time in the use process, obtaining the real-time temperature difference of the cooling water at the inlet and the outlet of the tuyere small sleeve 1, and replacing the tuyere small sleeve 1 if the difference of the real-time temperature difference of the cooling water at the inlet and the outlet of the tuyere small sleeve 1 and the initial temperature difference of the cooling water at the inlet and the outlet of the tuyere small sleeve 1 is larger than a preset value under the same working condition.

The heat output of the tuyere small sleeve 1 mainly comprises that the outer peripheral surface 101 and the outlet end surface 102 are in high-temperature contact with the inside of the blast furnace, and the heat output of the outer peripheral surface 101 and the outlet end surface 102 of the tuyere small sleeve 1 accounts for 80 percent of the total heat output of the tuyere small sleeve 1, and is 3200m ³ For example, a blast furnace is used for carrying out heat conduction energy-saving evaluation calculation: the thickness of the rare earth tantalate ceramic thermal barrier coating 2a is 0.6mm, the heat conduction performance is equivalent to that of red copper, namely, the thickness of red copper is 0.6mm multiplied by 407W/(m.K)/(1.2W/(m.K) =203.5 mm thick, and the thickness of a cooling cavity of the tuyere small sleeve 1 is 15mm, so that the theoretical reduction of heat conduction is 203.5 mm/(203.5mm+15 mm) ×70% =0.65%, and the difference is 50% -55% less on average, and the cooling water temperature difference is about 3 ℃ (the actual water temperature difference is generally 6 ℃ -8 ℃).

At 3200m ³ For example, the cooling water channel of each tuyere small sleeve 1 has a normal water volume of about 35t/h and 32 channels, the cooling water volume of the tuyere small sleeve 1 is about 1120t/h, and the energy is saved by about 1120t/h multiplied by 1000kcal/t multiplied by 3 ℃ multiplied by 3360 multiplied by 10 according to the temperature difference of 3 DEG C ³ Large calorie/h, the heat value of the metallurgical coke of the blast furnace is 8000 multiplied by 10 ³ Large card/t, the burning completion rate of the coke is 70 percent, and the coke is saved by 3360 multiplied by 10 ³ Large card/h/8000X 10 ³ Big card/t×70%) =0.6 t/h, 1 seat 3200m ³ The annual section metallurgical coke of the blast furnace is about 0.6t/h×24h×360 d=5184 t.

The outlet water temperature of each tuyere small sleeve 1 is measured independently, and the temperature difference between the water temperature and the inlet water temperature is recorded (the working condition of each tuyere small sleeve 1 is inconsistent with the working condition in the furnace, the temperature difference is different, and the outlet level average temperature difference of all the tuyere small sleeves 1 is predicted to be 2-4 ℃), if the outlet water temperature of the single tuyere small sleeve 1 is abnormally increased and exceeds the original outlet level average temperature difference by 1 ℃ (for example, the average water temperature difference between the single tuyere small sleeve 1 and the original outlet is 0.8 ℃, the average water temperature difference between the single tuyere small sleeve and the original outlet is 1.8 ℃, and the single tuyere small sleeve is in an ascending trend), the energy conservation of the tuyere small sleeve 1 is obviously reduced, and the tuyere small sleeve 1 is replaced at the moment.

In order to ensure the energy-saving and high-efficiency performance of the tuyere small sleeve 1, the tuyere small sleeve 1 in the low-efficiency state is replaced in time, but the replacement time of the tuyere small sleeve 1 needs to be consistent with the planned damping down of the blast furnace, so that the state of the tuyere small sleeve 1 is accurately known in time, and the tuyere small sleeve 1 is replaced in synchronization with the planned damping down in advance or after the time is properly advanced or delayed.

In another embodiment of the present invention, there is provided another energy saving method for a tuyere device of a blast furnace, including the steps of:

s201: the method comprises the steps that a first rare earth tantalate ceramic thermal barrier coating 2a with the thickness not smaller than 0.1mm is arranged on the outer peripheral surface 101 and the outlet end surface 102 of a tuyere small sleeve 1 of a blast furnace tuyere device, a second rare earth tantalate ceramic thermal barrier coating 2b with the thickness not smaller than 0.1mm is arranged on the wall surface 103 of an air supply channel, or the first rare earth tantalate ceramic thermal barrier coating 2a with the thickness not smaller than 0.1mm and a first ultrahigh-temperature wear-resistant coating 3a with the thickness not smaller than 0.1mm are sequentially arranged on the outer peripheral surface 101 and the outlet end surface 102 of the tuyere small sleeve 1 of the blast furnace tuyere device, and the second rare earth tantalate ceramic thermal barrier coating 2b with the thickness not smaller than 0.1mm and a second ultrahigh-temperature wear-resistant coating 3b with the thickness not smaller than 0.1mm are sequentially arranged on the wall surface 103 of the air supply channel of the tuyere small sleeve 1 of the blast furnace tuyere device.

Unlike the above embodiment, the wall surface 103 of the air supply channel is provided with the second rare earth tantalate ceramic thermal barrier coating 2b, and as the hot air at 1100-1400 ℃ passes through the air supply channel, a large amount of heat is heat exchanged with cooling water through the wall surface 103 of the air supply channel and is taken away by circulating cooling water in the tuyere small sleeve 1 (25% of the total amount of heat taken away by the tuyere small sleeve 1). By adding the second rare earth tantalate ceramic thermal barrier coating 2b on the wall surface 103 of the air supply channel of the air port small sleeve 1, the heat output of the inner hole surface of the air supply channel is blocked, and the second ultra-high temperature wear-resistant coating 3b can protect the second rare earth tantalate ceramic thermal barrier coating 2b from abrasion.

S202: measuring the temperature of cooling water at the inlet and the outlet of a cooling water cavity of the tuyere small sleeve 1 at the initial stage, obtaining the initial temperature difference of the cooling water at the inlet and the outlet of the tuyere small sleeve 1, measuring the temperature of the cooling water at the inlet and the outlet of the cooling water cavity of the tuyere small sleeve 1 in real time in the use process, obtaining the real-time temperature difference of the cooling water at the inlet and the outlet of the tuyere small sleeve 1, and replacing the tuyere small sleeve 1 if the difference of the real-time temperature difference of the cooling water at the inlet and the outlet of the tuyere small sleeve 1 and the initial temperature difference of the cooling water at the inlet and the outlet of the tuyere small sleeve 1 is larger than a preset value under the same working condition.

Compared with the previous embodiment, by arranging the second rare earth tantalate ceramic thermal barrier coating 2b on the wall of the air supply channel of the tuyere small sleeve 1, the tuyere small sleeve 1 is increased by 20 percent of thermal barriers of other heated parts, and compared with the previous embodiment, the tuyere small sleeve is equal to 3200m in terms of the same performance ³ For example, a blast furnace 5184t×20% ≡80% = 1296t, and the metallurgical coke energy saving of about 1300t can be increased throughout the year.

The tuyere small sleeve 1 of this example is made of 3200m ³ The blast furnace is taken as an example, and the metallurgical coke of 6500t (5184t+1296t) can be saved all the year round.

In still another embodiment of the present invention, there is provided a blast furnace tuyere device energy saving method including the steps of:

s301: the outlet end face 401 of the tuyere medium sleeve 4 of the blast furnace tuyere device is provided with a fourth rare earth tantalate ceramic thermal barrier coating 2c with the thickness not smaller than 0.1mm, or the outlet end face of the tuyere medium sleeve 4 of the blast furnace tuyere device is provided with the fourth rare earth tantalate ceramic thermal barrier coating 2c with the thickness not smaller than 0.1mm and a third ultra-high temperature wear-resistant coating 3c with the thickness not smaller than 0.1mm in sequence;

unlike the above embodiment, in this embodiment, the fourth rare earth tantalate ceramic thermal barrier coating 2c is disposed on the outlet end face of the tuyere medium sleeve 4, it can be appreciated that the outlet end face 401 of the tuyere medium sleeve 4 also faces directly into the furnace, which is the largest heating surface of the tuyere medium sleeve 4 and occupies about 80% of the total heat receiving amount of the tuyere medium sleeve 4, so the fourth rare earth tantalate ceramic thermal barrier coating 2c is also added on the outlet end face 401 of the tuyere medium sleeve 4, and the third ultra-high temperature wear-resistant coating 3c can protect the fourth rare earth tantalate ceramic thermal barrier coating 2c, and maintain the heat blocking performance of the thermal barrier coating to be high-efficient and durable.

S302: measuring the temperature of the cooling water at the inlet and the outlet of the cooling water cavity of the tuyere medium sleeve 4 at the initial stage, obtaining the initial temperature difference of the cooling water at the inlet and the outlet of the tuyere medium sleeve 4, measuring the temperature of the cooling water at the inlet and the outlet of the cooling water cavity of the tuyere medium sleeve 4 in real time in the use process, obtaining the real-time temperature difference of the cooling water at the inlet and the outlet of the tuyere medium sleeve 4, and replacing the tuyere medium sleeve 4 if the difference of the real-time temperature difference of the cooling water at the inlet and the outlet of the tuyere medium sleeve 4 and the initial temperature difference of the cooling water at the inlet and the outlet of the tuyere medium sleeve 4 is larger than a preset value under the same working condition.

At 3200m ³ For example, after the rare earth tantalate ceramic thermal barrier coating 2c is used, the cooling water flow rate of each cooling water channel of the 32 tuyere medium sleeves 4 is 20t/h, and the cooling water inlet-outlet temperature difference is reduced by 1 ℃ in the whole period, and the cooling water flow rate is 32 multiplied by 20t/h multiplied by 1000 kcal/t=640 multiplied by 10 ³ Large calorie/h, the heat value of the metallurgical coke of the blast furnace is 8000 multiplied by 10 ³ The combustion completion rate of the blast furnace coke is 70% by large calorie/t, so that the coke is saved by 640 multiplied by 10 ³ Large card/h/8000X 10 ³ Big card/t×60%) =0.133 t/h, 1 seat 3200m ³ The annual saving coke of the blast furnace is 0.133t/h×24h×360 d=1150 t.

In still another embodiment of the present invention, unlike the above embodiment, which provides a first rare earth tantalate ceramic thermal barrier coating 2a on the outer peripheral surface 101 and the outlet end face 102 of the tuyere small sleeve 1 of the blast furnace tuyere device and a fourth rare earth tantalate ceramic thermal barrier coating 2c on the outlet end face 401 of the tuyere medium sleeve 4, there is provided a method for saving energy of the tuyere device, comprising the steps of:

S401: the method comprises the steps that a first rare earth tantalate ceramic thermal barrier coating 2a with the thickness not smaller than 0.1mm is arranged on the outer peripheral surface 101 of a tuyere small sleeve 1 of a blast furnace tuyere device, which stretches into a blast furnace, and an outlet end surface 102, or a first rare earth tantalate ceramic thermal barrier coating 2a with the thickness not smaller than 0.1mm and a first ultrahigh-temperature wear-resistant coating 3a with the thickness not smaller than 0.1mm are sequentially arranged on the outer peripheral surface 101 of the tuyere small sleeve 1 of the blast furnace tuyere device, which stretches into the blast furnace, and the outlet end surface 102;

s402: a fourth rare earth tantalate ceramic thermal barrier coating 2c with the thickness not smaller than 0.1mm is arranged on the outlet end face 401 of the tuyere medium sleeve 4 of the blast furnace tuyere device, or the fourth rare earth tantalate ceramic thermal barrier coating 2c with the thickness not smaller than 0.1mm and a third ultra-high temperature wear-resistant coating 3c with the thickness not smaller than 0.1mm are arranged on the outlet end face 401 of the tuyere medium sleeve 4 of the blast furnace tuyere device in sequence;

s403: measuring the temperature of cooling water at the inlet and the outlet of a cooling water cavity of the tuyere small sleeve 1 at the initial stage and obtaining the initial temperature difference of the cooling water at the inlet and the outlet of the tuyere small sleeve 1, measuring the temperature of the cooling water at the inlet and the outlet of the cooling water cavity of the tuyere small sleeve 1 in real time and obtaining the real-time temperature difference of the cooling water at the inlet and the outlet of the tuyere small sleeve 1 in the use process, and if the difference of the real-time temperature difference of the cooling water at the inlet and the outlet of the tuyere small sleeve 1 and the initial temperature difference of the cooling water at the inlet and the outlet of the tuyere small sleeve 1 is larger than a preset value under the same working condition, replacing the tuyere small sleeve 1;

S404: measuring the temperature of the cooling water at the inlet and the outlet of the cooling water cavity of the tuyere medium sleeve 4 at the initial stage, obtaining the initial temperature difference of the cooling water at the inlet and the outlet of the tuyere medium sleeve 4, measuring the temperature of the cooling water at the inlet and the outlet of the cooling water cavity of the tuyere medium sleeve 4 in real time in the use process, obtaining the real-time temperature difference of the cooling water at the inlet and the outlet of the tuyere medium sleeve 4, and replacing the tuyere medium sleeve 4 if the difference of the real-time temperature difference of the cooling water at the inlet and the outlet of the tuyere medium sleeve 4 and the initial temperature difference of the cooling water at the inlet and the outlet of the tuyere medium sleeve 4 is larger than a preset value under the same working condition.

In the last embodiment of the present invention, there is provided a method for saving energy of a blast furnace tuyere device, which is different from the above-mentioned embodiment in that a first rare earth tantalate ceramic thermal barrier coating 2a is provided on an outer circumferential surface 101 and an outlet end surface 102 of a tuyere small sleeve 1, a second rare earth tantalate ceramic thermal barrier coating 2b is provided on an air supply passage wall surface 103 of the tuyere small sleeve 1, and a fourth rare earth tantalate ceramic thermal barrier coating 2c is provided on an outlet end surface 401 of a tuyere medium sleeve 4, comprising the steps of:

s501: a first rare earth tantalate ceramic thermal barrier coating 2a with the thickness not smaller than 0.1mm is arranged on the outer peripheral surface 101 and the outlet end surface 102 of the tuyere small sleeve 1 extending into the blast furnace of the blast furnace tuyere device, a second rare earth tantalate ceramic thermal barrier coating 2b with the thickness not smaller than 0.1mm is arranged on the wall surface 103 of the air supply channel of the tuyere small sleeve 1, or the first rare earth tantalate ceramic thermal barrier coating 2a with the thickness not smaller than 0.1mm and the first ultrahigh temperature wear-resistant coating 3a with the thickness not smaller than 0.1mm are sequentially arranged on the outer peripheral surface 101 and the outlet end surface 102 of the tuyere small sleeve 1 extending into the blast furnace of the blast furnace tuyere device, and the second rare earth tantalate ceramic thermal barrier coating 2b with the thickness not smaller than 0.1mm and the second ultrahigh temperature wear-resistant coating 3b with the thickness not smaller than 0.1mm are sequentially arranged on the wall surface 103 of the air supply channel of the tuyere small sleeve 1;

S502: the outlet end face 401 of the tuyere medium sleeve 4 of the blast furnace tuyere device is provided with a fourth rare earth tantalate ceramic thermal barrier coating 2c with the thickness not smaller than 0.1mm, or the outlet end face of the tuyere medium sleeve 4 of the blast furnace tuyere device is provided with the fourth rare earth tantalate ceramic thermal barrier coating 2c with the thickness not smaller than 0.1mm and a third ultra-high temperature wear-resistant coating 3c with the thickness not smaller than 0.1mm in sequence;

s503: measuring the temperature of cooling water at the inlet and the outlet of a cooling water cavity of the tuyere small sleeve 1 at the initial stage and obtaining the initial temperature difference of the cooling water at the inlet and the outlet of the tuyere small sleeve 1, measuring the temperature of the cooling water at the inlet and the outlet of the cooling water cavity of the tuyere small sleeve 1 in real time and obtaining the real-time temperature difference of the cooling water at the inlet and the outlet of the tuyere small sleeve 1 in the use process, and if the difference of the real-time temperature difference of the cooling water at the inlet and the outlet of the tuyere small sleeve 1 and the initial temperature difference of the cooling water at the inlet and the outlet of the tuyere small sleeve 1 is larger than a preset value under the same working condition, replacing the tuyere small sleeve 1;

s504: measuring the temperature of the cooling water at the inlet and the outlet of the cooling water cavity of the tuyere medium sleeve 4 at the initial stage, obtaining the initial temperature difference of the cooling water at the inlet and the outlet of the tuyere medium sleeve 4, measuring the temperature of the cooling water at the inlet and the outlet of the cooling water cavity of the tuyere medium sleeve 4 in real time in the use process, obtaining the real-time temperature difference of the cooling water at the inlet and the outlet of the tuyere medium sleeve 4, and replacing the tuyere medium sleeve 4 if the difference of the real-time temperature difference of the cooling water at the inlet and the outlet of the tuyere medium sleeve 4 and the initial temperature difference of the cooling water at the inlet and the outlet of the tuyere medium sleeve 4 is larger than a preset value under the same working condition.

Based on the first, second, fourth and fifth embodiments, the water supply amount of the tuyere small sleeve 1 is reduced in the use process, and the inlet and outlet water temperature difference of the tuyere small sleeve 1 with the rare earth tantalate ceramic thermal barrier coating in the embodiment of the invention when the tuyere small sleeve works normally is regulated to be basically consistent with the inlet and outlet water temperature difference of the tuyere small sleeve 1 without the rare earth tantalate ceramic thermal barrier coating;

the output heat of the tuyere small sleeve 1 is greatly reduced under the blocking condition, the required cooling water quantity is also greatly reduced, and the high-pressure water supply adopted for large-scale water supply is 3200m because the tuyere small sleeve 1 is small in volume ³ For example, the water supply pressure of the blast furnace is 1.6MPa, the water supply amount of the tuyere small sleeve 1 is reduced, and the water supply amount can be reduced by 1/2 when the temperature difference of water inlet and outlet of the tuyere small sleeve 1 with the rare earth tantalate ceramic thermal barrier coating in the embodiment of the invention is regulated to be basically consistent with the temperature difference of water inlet and outlet of the tuyere small sleeve 1 without the rare earth tantalate ceramic thermal barrier coating when the tuyere small sleeve 1 works normally.

According to the reduced water supply quantity, calculating the reduced energy of water supply motor saved by water supply and circulating pure water cooling to 3200m ³ For example, when the water supply amount is reduced by 1/2, the water supply quality and flow rate are reduced by 1/2, and the water supply power is reduced by more than 75%, the energy saving is estimated to be 750kVA multiplied by 75% multiplied by 24h multiplied by 360 d/10000=486 kilokw.

In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides a wind gap cover, its characterized in that, the wind gap cover stretches into the outer peripheral face in the blast furnace and the export terminal surface sets up the first rare earth tantalate ceramic thermal barrier coating of thickness not less than 0.1mm, or, the wind gap cover stretches into the outer peripheral face in the blast furnace and the export terminal surface sets gradually the first rare earth tantalate ceramic thermal barrier coating of thickness not less than 0.1mm and the first super high temperature wear-resisting coating of thickness not less than 0.1 mm.

2. The tuyere small sleeve according to claim 1, wherein a second rare earth tantalate ceramic thermal barrier coating with the thickness not smaller than 0.1mm is arranged on the wall surface of the air supply channel of the tuyere small sleeve, or a second rare earth tantalate ceramic thermal barrier coating with the thickness not smaller than 0.1mm and a second ultrahigh temperature wear-resistant coating with the thickness not smaller than 0.1mm are sequentially arranged on the wall surface of the air supply channel of the tuyere small sleeve.

3. The tuyere small sleeve as claimed in claim 2, wherein a transition layer with a thickness of 0.1 mm-0.2 mm is arranged between the outer peripheral surface and the outlet end surface of the tuyere small sleeve and the first rare earth tantalate ceramic thermal barrier coating, and a transition layer with a thickness of 0.1 mm-0.2 mm is arranged between the wall surface of the air supply channel of the tuyere small sleeve and the second rare earth tantalate ceramic thermal barrier coating.

4. A tuyere small sleeve as claimed in claim 3, wherein a basic coating is arranged between the first rare earth tantalate ceramic thermal barrier coating and the transition layer, and the basic coating at least comprises a yttria-stabilized zirconia coating;

5. The tuyere small sleeve of claim 4, wherein the basic coating comprises a plurality of layers of yttria-stabilized zirconia coatings and a plurality of layers of third rare earth tantalate ceramic thermal barrier coatings, and each of the yttria-stabilized zirconia coatings and each of the third rare earth tantalate ceramic thermal barrier coatings are alternately arranged in sequence.

6. The tuyere small sleeve of any one of claims 2-5, wherein a transition layer with the thickness of 0.1 mm-0.2 mm is arranged between the first rare earth tantalate ceramic thermal barrier coating and the first ultra-high temperature wear-resistant coating;

7. Tuyere small sleeve according to any of the claims 1-5, characterized in that the first rare earth tantalate ceramic thermal barrier coating is rare earth tantalate RETaO ₄ Single layer coating, rare earth tantalate RE ₃ TaO ₇ +RETaO ₄ Double-layer coating and rare earth tantalate RE ₃ TaO ₇ +RETa ₃ O ₉ +RETaO ₄ One of the three layers of coating; the second rare earth tantalate ceramic thermal barrier coating is rare earth tantalate RETaO ₄ Single layer coating, rare earth tantalate RE ₃ TaO ₇ +RETaO ₄ Double-layer coating and rare earth tantalate

RE ₃ TaO ₇ +RETa ₃ O ₉ +RETaO ₄ One of the three layers of coating.

8. The tuyere small sleeve of any of claims 1-5, wherein the first ultra-high temperature wear resistant coating is one of a SiC coating, a SiN coating and a Ni-based WC coating; the second ultra-high temperature wear-resistant coating is one of a SiC coating, a SiN coating and a Ni-based WC coating.

9. The utility model provides a cover in wind gap, its characterized in that, the export terminal surface of cover sets up the fourth rare earth tantalate ceramic thermal barrier coating that thickness is not less than 0.1mm in the wind gap, perhaps, the export terminal surface of cover sets up the fourth rare earth tantalate ceramic thermal barrier coating that thickness is not less than 0.1mm and the third superhigh temperature wear-resisting coating that thickness is not less than 0.1mm in proper order in the wind gap.

10. The tuyere medium sleeve of claim 7, wherein a transition layer with the thickness of 0.1 mm-0.2 mm is arranged between the outlet end face of the tuyere medium sleeve and the fourth rare earth tantalate ceramic thermal barrier coating.

11. The tuyere medium sleeve of claim 10, wherein a basic coating is arranged between the fourth rare earth tantalate ceramic thermal barrier coating and the transition layer, and the basic coating at least comprises a yttria-stabilized zirconia coating.

12. The tuyere medium sleeve of claim 11, wherein the base coating comprises a plurality of yttria-stabilized zirconia coatings and a plurality of fifth rare earth tantalate ceramic thermal barrier coatings, each of the yttria-stabilized zirconia coatings and each of the fifth rare earth tantalate ceramic thermal barrier coatings being alternately disposed in sequence.

13. The tuyere medium sleeve of any of claims 9-12, wherein a transition layer with a thickness of 0.1-0.2 mm is arranged between the fourth rare earth tantalate ceramic thermal barrier coating and the ultra-high temperature wear resistant coating.

14. Tuyere medium sleeve according to any of the claims 9-12, characterized in that the fourth rare earth tantalate ceramic thermal barrier coating is rare earth tantalate RETaO ₄ Single layer coating, rare earth tantalate RE ₃ TaO ₇ +RETaO ₄ Double-layer coating and rare earth tantalate RE ₃ TaO ₇ +RETa ₃ O ₉ +RETaO ₄ One of the three layers of coating.

15. The tuyere medium sleeve of any of claims 9-12, wherein the third ultra-high temperature wear resistant coating is one of a SiC coating, a SiN coating and a Ni-based WC coating.

16. A blast furnace tuyere device comprising a tuyere large sleeve, a tuyere medium sleeve and a tuyere small sleeve which are sequentially connected, wherein the tuyere small sleeve is the tuyere small sleeve according to any one of claims 1 to 8, and the tuyere medium sleeve is the tuyere medium sleeve according to any one of claims 9 to 15.

17. An energy-saving method for a blast furnace tuyere device is characterized by comprising the following steps:

18. An energy-saving method for a blast furnace tuyere device is characterized by comprising the following steps:

19. An energy-saving method for a blast furnace tuyere device is characterized by comprising the following steps:

20. An energy-saving method for a blast furnace tuyere device is characterized by comprising the following steps:

21. An energy-saving method for a blast furnace tuyere device is characterized by comprising the following steps: