CN111111374A - Natural water absorber and method for reducing oxidation burning loss of hot rolled plate by using same - Google Patents
Natural water absorber and method for reducing oxidation burning loss of hot rolled plate by using same Download PDFInfo
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- CN111111374A CN111111374A CN201911389424.0A CN201911389424A CN111111374A CN 111111374 A CN111111374 A CN 111111374A CN 201911389424 A CN201911389424 A CN 201911389424A CN 111111374 A CN111111374 A CN 111111374A
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- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
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Abstract
The invention discloses a natural water absorber and a method for reducing oxidation burning loss of a hot rolled plate, wherein the natural water absorber comprises at least two groups of inverted U-shaped tubes and a water absorbing material filled in the inverted U-shaped tubes, the water absorbing material comprises porous activated alumina and super absorbent acrylic resin particles, and the filling amount is 1/3-1/2 of the volume of the inverted U-shaped tube; furthermore, the invention also discloses a method for reducing the oxidation burning loss of the hot rolled plate, which comprises the steps of mixing coal gas and combustion-supporting airThe air is respectively dried by a first vertical conical tube, an upper transverse tube, a second vertical conical tube and a lower transverse tube of a set of U-shaped tubes of the natural water absorber; after drying treatment, the water content in the coal gas and the air is 10-50 g/m3Reduced to 5g/m3The dried coal gas and air are adopted to heat the steel billet, and the thickness of the oxide skin is reduced by at least 50 percent; the mixed water-absorbing material of the invention is simple and convenient to process and can be repeatedly used after being dried and dehydrated.
Description
Technical Field
The invention relates to the field of hot rolled plate blank heating, in particular to a natural water absorber and a method for reducing oxidation burning loss of a hot rolled plate by using the same.
Background
By 2017, the number of hot rolled plate strip production lines in service in the ferrous metallurgy industry in China reaches more than 200, the total number of the hot rolled plate strip production lines is more than 1000, and the capacity of the hot rolled plate strip reaches 3 hundred million tons per year. The thickness of an initial plate blank is generally 100-350 mm, the plate strip processing process is generally the process flows of heating → rough rolling cogging → heating → medium rolling → finish rolling and the like, heating is carried out by multiple times of fire, the heating time is different from 0.5-3 h, the thickness of a single-time heating oxide skin is 0.2-1 mm, and the oxidation burning loss in the heating process reaches about 1.5%. If the oxidation burning loss can be reduced to 1.0%, 150 million tons of hot rolled plate strips can be saved every year, 90 million yuan can be saved according to the average 6000 yuan/ton of the hot rolled plate strips, the economic benefit is considerable, in addition, the oxidation burning loss is reduced, the heat energy loss can be reduced, the energy is saved, the oxide skin thickness is reduced, the surface quality of rolled plates can be improved, the yield is improved, and the social benefit is higher.
The steel plate strip is widely applied to industries of automobiles, machinery, electronics, electricity and the like, for example, steel plates are needed for automobile skins, mobile phone shells, chassis and the like, the production process of the steel plate strip is generally continuous casting and continuous rolling, cast steel billets are heated to 1100-1250 ℃ in a heating furnace, then are subjected to hot rough rolling and cogging, then are heated again, are subjected to multi-pass medium rolling and finally are subjected to finish rolling, in the whole production process, in order to reduce the rolling force, heating for multiple fire passes is needed, and oxide skins are formed on the surfaces of the steel billets during each heating, so that oxidation burning loss is generated.
The steel rolling heating is generally gas heating, the gas of a steel rolling mill is the mixed gas of coke oven gas, blast furnace gas and converter gas, the sources of the gas are three types, the coke oven gas generated by steel rolling mill coking, the blast furnace gas generated by blast furnace ironmaking and the converter gas generated by converter steelmaking, and the components and the heat values of the three types of gas are different.
The coke oven gas mainly comprises 55-60% of hydrogen and 23-27% of methane, and also comprises a small amount of carbon monoxide (5-8%), 2-4% of unsaturated hydrocarbon, 1.5-3% of carbon dioxide, 0.3-0.8% of oxygen), 3-7% of nitrogen, and has a high calorific value of 16720-18810 kJ/m3The combustible content is high (about 90 percent), and in addition, the combustible fuel also contains a small amount of H2S, tar, naphthalene and dust. The purification of the coke-oven gas requires the treatment of gas cooling, dust removal, naphthalene removal, oil removal, ammonia absorption, benzene absorption, desulfurization and the like, and in the treatment links, the gas needs to pass through water for many times, so the water vapor content in the coke-oven gas is high.
The blast furnace gas is gas generated in the blast furnace ironmaking production process, and comprises 6-12% of carbon dioxide, 28-33% of carbon monoxide, 1-4% of hydrogen, 55-60% of nitrogen, 0.2-0.5% of hydrocarbon and a small amount of SO2And saturated steam with a heat value of 3300-4200 kJ/m3. The dust concentration of it is 10-50 g/m3The dust yield is 50 kg/t-75 kg/t on average, the particle size of the dust is below 500 μm, and the dust is mainly iron, ferrous oxide, alumina, silicon oxide, magnesium oxide and coke powder.
The converter gas is generated in the converter steelmaking process, carbon in molten iron and blown oxygen generate mixed gas of carbon monoxide and a small amount of carbon dioxide at high temperature, wherein the carbon monoxide accounts for 60-80%, the carbon dioxide accounts for 15-20%, and the mixed gas also contains a small amount of nitrogen, hydrogen and trace oxygen, and the calorific value of the mixed gas is 8400-9300 kJ/m3. When the converter gas is sprayed out from a furnace mouth, the temperature is up to 1450-1500 ℃, a large amount of iron oxide dust is carried, the converter gas can be used after being cooled and dedusted, the converter gas needs to be cooled by water, and the water vapor content in the gas is also very high.
On the other hand, the gas combustion needs air for combustion supporting, the air also contains a large amount of water vapor, and the water vapor content changes with different seasons, weather and temperatures. In the sea area, for example, the four seasonsThe temperature variation is generally within the range of 10 to 40 ℃, and the saturated water vapor content in the air is within the range of 9.35 to 50.91g/m3That is, the water vapor content in the air is 0 to 50.91g/m3The fluctuation in the range varies with different seasons, weather and temperatures.
In the prior art, mixed gas formed by coke oven gas, blast furnace gas and converter gas is dehydrated when entering a gas storage cabinet, but the water content of the mixed gas is still more than 20g/m3Usually, it is 30 to 50g/m3And the traditional tubular rotational flow plate has limited dewatering effect, wire mesh dewatering effect, gravity dewatering effect and the like, so that the water content is difficult to further reduce, and the energy consumption is too high. The combustion air is not dehydrated generally, and is sent into the combustion fan through the air pipe to be blown into the combustion chamber. Research of researchers in various fields of combustion science shows that (gawein, grandbin, Wangjiaming, Zhangliang, research progress of high-temperature oxidation behavior of alloy steel containing chromium and silicon in water vapor atmosphere, hot working process, 2019,48(10):6-14) compared with dry atmosphere, oxide skin generally generates more cavities in water vapor atmosphere, water vapor can accelerate oxidation rate at high temperature, water vapor permeates into the oxide skin to form microcracks, loose and porous oxide skin is formed, and the capacity of forming a protective oxide layer is reduced, so that the oxidation resistance of steel is poor and thick loose oxide skin is formed in the water vapor atmosphere.
Disclosure of Invention
The invention aims to reduce the content of water vapor in mixed gas and combustion-supporting air, thereby reducing the oxidation rate and the thickness of oxide skin in the heating process of a hot-rolled plate blank. In order to achieve the purpose, the invention provides a water absorbing material, a natural water absorber and a method for reducing the oxidation burning loss of a hot rolled plate, which adopts the following technical scheme:
a set of natural water absorber comprises at least two groups of inverted U-shaped tubes and water absorbing materials filled in the inverted U-shaped tubes, and the lower ends of the two adjacent groups of inverted U-shaped tubes are connected through a lower transverse tube.
Furthermore, the two ends of the lower transverse pipe are provided with water storage elbows, and the lower transverse pipe and the water storage elbows are integrally in an H-shaped structure.
Furthermore, the inverted U-shaped pipe comprises two vertical conical pipes and an upper transverse pipe, and the top ends of the two conical pipes are connected with the upper transverse pipe.
Furthermore, the tapered tube is of a tapered structure with a wide upper part and a narrow lower part.
Furthermore, the conical tube, the upper transverse tube and the lower transverse tube are detachably connected through tube joints.
Furthermore, the lower end of the conical tube and the two ends of the lower transverse tube are both provided with stainless steel wire mesh pads.
Further, the aperture of the stainless steel wire gauze pad is smaller than 2 mm.
Furthermore, the water absorbing materials are respectively filled in the conical tube and the lower transverse tube, and the filling amount of the water absorbing materials is 1/3-1/2 of the volume of the conical tube and the volume of the lower transverse tube.
The water absorbing material filled in the natural water absorber consists of porous active alumina particles and high-water-absorptivity acrylic resin particles, wherein the porous active alumina particles and the high-water-absorptivity acrylic resin particles are spherical particles with the diameter of 3-30 mm, and the volume ratio of the porous active alumina particles in the water absorbing material is 50-70%.
A method for utilizing the natural water aspirator to reduce the hot-rolled plate and oxidize and burn the natural water aspirator, said method comprises using coal gas and combustion air used for heating the hot-rolled steel billet to pass through a set of said natural water aspirator separately, from the first vertical conical pipe, upper horizontal pipe, second vertical conical pipe, lower horizontal pipe of the U-shaped pipe; after the coal gas and the combustion air pass through the natural water absorber, the contained water is absorbed by the porous activated alumina and the super absorbent acrylic resin, and after dehydration and drying treatment, the water content in the coal gas and the combustion air is 10-50 g/m3Reduced to 5g/m3The hot rolled steel billet is heated by using the coal gas and combustion air after dehydration and drying treatment, and the thickness of the oxide skin on the surface of the steel billet is reduced by at least 50%.
Compared with the prior art, the invention has the beneficial technical effects that:
1. the invention can greatly reduce the water content in the mixed gas and the combustion-supporting air in a steel mill, thereby reducing the oxidation rate of the hot rolled steel billet in the heating furnace and reducing the thickness of an oxide scale;
2. the U-shaped pipes are detachably connected, the structure is simple, the installation is convenient, the existing gas treatment system of a steel rolling mill is not required to be changed, and only the natural water absorbers are additionally arranged at the gas outlet part and the air inlet pipe;
3. the water absorbing material is formed by mixing activated alumina and water absorbing acrylic resin, has the advantages of high water absorbing speed, large water absorbing capacity and smooth airflow, can quickly absorb water in coal gas and combustion air, can avoid frequent replacement of a water absorber, and improves the production efficiency;
4. the water absorbing material can be reused after being dried and dehydrated, so that the cost is reduced, and the material consumption is reduced.
Drawings
FIG. 1 is a schematic structural view of the natural water aspirator of the present invention.
In the figure: 1. a tapered tube; 2. an upper horizontal pipe; 3. a lower horizontal pipe, 4, a stainless steel wire mesh pad, 5 and a water storage elbow; 6. a water-absorbing material; 7. a pipe joint.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to fig. 1 in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments.
As shown in fig. 1, for the natural water absorber provided by the present invention, a set of natural water absorber includes at least two sets of adjacent inverted U-shaped tubes, water absorbing material 6 is filled in the tubes, the bottom ends of the two sets of adjacent inverted U-shaped tubes are connected through a lower horizontal tube 3, 3 or more than 3 sets of U-shaped tubes can be set according to the ventilation volume, and the bottom ends of the two sets of adjacent inverted U-shaped tubes are connected through the lower horizontal tube 3;
the inverted U-shaped pipe comprises two vertical conical pipes 1, the top ends of the two vertical conical pipes 1 are connected through an upper transverse pipe 2, the bottom end of one vertical conical pipe 1 of the inverted U-shaped pipe is connected with the bottom end of one vertical conical pipe 1 of the adjacent inverted U-shaped pipe through a lower transverse pipe 3, and the bottom end of the other vertical conical pipe 1 of the adjacent inverted U-shaped pipe is connected with the other lower transverse pipe 3; the two ends of each lower transverse pipe 3 are provided with water storage elbows 5 for storing water flowing downwards under the action of gravity, and the lower transverse pipes 3 and the water storage elbows 5 are integrally formed into an integral H-shaped structure; part of the saturated water flows into the lower transverse pipe 3 under the action of gravity, and the water storage elbows 5 arranged at the two ends of the lower transverse pipe 3 can be replaced periodically;
water absorbing materials are filled in the conical tube 1 and the lower transverse tube 3, the filling amount of the water absorbing materials is 1/3-1/2 of the volume of the tube, the water absorbing materials cannot be filled because the acrylic resin expands after absorbing water, the water absorbing materials are only required to be filled in 1/3-1/2 of the volume of the tube, and the top transverse tube is not filled with the water absorbing materials and is reserved as a space for expanding the volume of the acrylic resin after absorbing water.
The water absorbing material is a mixture consisting of porous active alumina particles and high water absorption acrylic resin particles, and the porous active alumina particles and the high water absorption acrylic resin particles are uniformly mixed by adopting a mechanical stirring mode; the active alumina particles and the acrylic resin particles are spherical, although the specific surface area can be improved by reducing the particle size, the particle size is not too small, dust is easily formed by too small particle size, meanwhile, in order to prevent the active alumina and the water-absorbent acrylic resin from leaking from a stainless steel wire mesh, the particle sizes of the active alumina and the water-absorbent acrylic resin are both required to be larger than 3mm, meanwhile, the specific surface area is reduced by too large particle size, so the particle size is not required to be larger than 30mm, and the value range of the particle size is 3-30 mm.
The activated alumina has high water absorption speed, but small water storage capacity, and the high water absorption acrylic resin has high water absorption capacity but low water absorption speed, so that when coal gas and air pass through the natural water absorber at high speed, the initial volume ratio of the activated alumina in the whole mixed material is not too low for improving the water absorption speed, and a certain amount of acrylic resin particles are needed for improving the water storage capacity. On the other hand, the acrylic resin becomes soft after absorbing water and is easy to gather together, and the air gaps can be blocked, while the porous alumina has high hardness and does not expand after absorbing water, so that a skeleton supporting effect is achieved, the acrylic resin is prevented from gathering together after absorbing water, and the air gaps are ensured to be kept between the water absorbing materials, so that gas can smoothly pass through the air gaps.
The conical tube 1 is of a structure with a wide upper end and a narrow lower end, and the reason for adopting the structure with the wide upper end and the narrow lower end is to reduce the resistance of the acrylic resin to water absorption expansion, protect equipment and facilitate taking out the water absorption material inside after water absorption saturation; the stainless steel wire gauze pad 4 is arranged at the lower end (the bottom of the water absorption material) of the conical tube 1; stainless steel wire gauze pads 4 are arranged at two ends of the water absorbing material in the lower transverse pipe 3; the aperture of the stainless steel wire gauze pad 4 is less than 2 mm.
Further, the conical pipe 1, the upper transverse pipe 2 and the lower transverse pipe 3 are detachably connected through a pipe joint 7; when the water absorption efficiency is reduced, the conical tube 1, the upper transverse tube 2 and the lower transverse tube 3 of the U-shaped tube are integrally disassembled, and the new conical tube 1, the upper transverse tube 2 and the lower transverse tube 3 are replaced; on the other hand, the replaced conical tube 1 is disassembled, the water absorbing material filled in the conical tube is taken out, and the conical tube is dried and then recycled, so that the cost is reduced, and the material consumption is reduced.
Activated alumina (gamma-Al) adopted by porous activated alumina particles in the water absorbent material of the invention2O3) At present, more than eight forms of alumina are known, among which α -Al is common2O3Belongs to a hexagonal system, has high melting point and high hardness, and is commonly used as a refractory material. gamma-Al2O3Belongs to an orthorhombic system, has a spinel-like lattice structure, is prepared by dehydrating aluminum hydroxide at the low temperature of 140-150 ℃, is industrially called as activated aluminum oxide, is insoluble in water, soluble in strong acid and strong base, and is converted into α -Al by heating to 1200 DEG C2O3. Gamma alumina is a porous material and is formed by mixingThe micro particle is formed by the agglomeration of several orders of magnitude smaller micro particles, and the micro particle is a conglomerate formed by conglomerating smaller primary particles, and micropores with different sizes are formed in the conglomerate, so that the micro particle has a very large specific surface area, the internal surface area per gram is up to hundreds of square meters, the micro particle has high activity and strong adsorption capacity, is stable in chemical property, and has good pressure resistance, wear resistance and heat resistance. gamma-Al2O3The active alumina is commonly used as an adsorbent, a catalyst and a catalyst carrier, because the active alumina and water have strong affinity, the active alumina is also a strong drying agent, the drying capacity of calcium chloride, silica gel, calcium oxide and the like is lower than that of the active alumina, and the active alumina can be regenerated and reused after being heated and dehydrated at the temperature of 175-315 ℃ after being used.
In view of activated alumina (. gamma. -Al)2O3) The invention is a good drying agent with large specific surface area, large affinity to water, and capability of rapidly absorbing water, so that the invention is supposed to adopt activated alumina as a coal gas water absorbing material.
On the other hand, the water absorption rate of the activated alumina is low, generally not more than 50% of the volume of the activated alumina, and the activated alumina is used as a gas water absorption material, so that the activated alumina is easy to saturate, and the water absorber needs to be frequently replaced. The high water absorption resin is a kind of high molecular material, before absorbing water, the resin high molecule is presented as solid network, when contacting water, the hydrophilic group on the molecular chain interacts with the water molecule, so that the network expands, the water molecule enters the network, thereby achieving the purpose of absorbing water. The acrylic resin is a commonly used super absorbent resin, can absorb water and store hundreds or thousands of times of self gravity, has high water absorption rate, high water retention, high expansibility and ammonia absorbability, is safe, non-toxic and environment-friendly, and is widely applied to hygienic products and medical materials.
The acrylic resin has large water absorption and storage capacity, the water absorption capacity can be about 500 times of the self weight generally, but the surface of the acrylic resin has no micropores and small specific surface area, so the water absorption speed is slow, and the water vapor in the coal gas is difficult to be quickly absorbed when the coal gas passes through the acrylic resin. On the other hand, acrylic resin is easy to gather together after absorbing water, blocks a ventilation gap, blocks gas and air from passing through, and leads to poor ventilation, so that the acrylic resin cannot be used independently.
The porous alumina is used as the filler, has the water absorption function, and simultaneously has the skeleton supporting function of the water absorption material to form a ventilation gap, so that the acrylic resin is prevented from gathering together after water absorption, and the gas can smoothly pass through. The invention mixes the porous alumina and the acrylic resin together, and solves the problems that the porous alumina has small water absorption capacity, the acrylic resin has low water absorption speed and is easy to gather to block the ventilation gap.
Therefore, in the invention, the activated alumina and the water-absorbing acrylic resin are mixed together to form a new mixed water-absorbing material, so that the advantages of the activated alumina and the water-absorbing acrylic resin are simultaneously exerted, the defects of the activated alumina and the water-absorbing acrylic resin are overcome, and the effects of making up for the defects, cooperatively absorbing water, storing water and keeping a ventilation gap are achieved. The activated alumina has the advantages of fast water vapor adsorption and air-permeable clearance formation, has the defects of low water storage capacity, the water-absorbent acrylic resin has the advantage of high water storage capacity, has the defects of low water vapor adsorption speed and easy aggregation, and the activated alumina and the water-absorbent acrylic resin are mixed together, and simultaneously has the advantages of high water absorption speed, air-permeable formation and high water storage capacity, thereby solving the problem that the coal gas needs to fast adsorb the water vapor when passing through quickly and simultaneously solving the problem of low water storage capacity.
After the activated alumina and the water-absorbing acrylic resin are mixed into the water-absorbing material, the water-absorbing material needs to be arranged in the conical pipe 1 and the lower horizontal pipe 3, so that the contact time of the water-absorbing material is prolonged when the mixed coal gas and the flame-retardant air flow.
The invention discloses a method for reducing oxidation burning loss of a hot rolling plate by using a natural water absorber, which comprises the following steps:
when the device is installed, two groups of conical tubes 1 are vertically placed, and the small-mouth ends of the conical tubes 1 face downwards; coal gas and flame-retardant air enter from the lower end of a vertical conical tube 1 of the U-shaped tube according to the arrow direction and sequentially pass through the upper transverse tube along the arrow direction2. The other vertical conical pipe 1 and the lower transverse pipe 3 of the U-shaped pipe flow into the adjacent U-shaped pipe and finally flow out of the lower transverse pipe 3 connected with the U-shaped pipe; the water content in the gas and air after flowing out is 10-50 g/m3Down to less than 5g/m3And in the combustion temperature range of 1100-1250 ℃, the thickness of the oxide scale of the billet is reduced by more than 50%.
The specific application is shown in the following embodiments, in the following application examples, the moisture content in the gas and combustion air is measured according to a gravimetric method specified in "determination of moisture content in exhaust gas" in section 5.2 of method for measuring particulate matter in exhaust gas of fixed pollution source and sampling of gaseous pollutants "in GB/T16157-1996, the thickness of the scale is measured by using a scanning electron microscope, the sample is sawed along the longitudinal direction of the oxidized billet, and after a transverse fracture is ground and polished, the thickness of the scale on the surface layer is measured by using the scanning electron microscope.
Example 1
Heating 45 steel billets with the thickness of 200mm and the width of 260mm, wherein the volume of the activated alumina in the natural water absorber accounts for 50 percent of the volume of the water absorbing material, the water absorbing acrylic resin accounts for 50 percent, and the water content in the original mixed coal gas is 40.1g/m3The water content in the original combustion air is 20.3g/m3The mixed gas and the combustion air respectively pass through the two groups of U-shaped tubes of the natural water absorber, and the water content in the mixed gas is reduced to 3.1g/m3The water content in the combustion air is 2.2g/m3. The 45 steel billets are heated by adopting the coal gas passing through the natural water absorber, the heating system is 1120 ℃ multiplied by 1h, after the heating is finished, the temperature of the steel billets is cooled to room temperature by adopting water spraying, and the thickness of the oxide scale is measured to be 0.16 mm.
Comparative example 1
Heating 45 steel billets with thickness of 200mm and width of 260mm, and water content of 40.1g/m in the original mixed gas3The water content in the original combustion air is 20.3g/m3Heating the 45 steel billet by using original mixed gas and original combustion air which are not subjected to dehydration and drying treatment, wherein the heating system is 1120 ℃ multiplied by 1h, cooling the steel billet to room temperature by using water spraying after the heating is finished, and measuring the thickness of an oxide scale to be 0.68 mm.
Example 2
Heating Fe-9Cr-0.26Si steel billet with thickness of 150mm and width of 200mm, active alumina in the natural water absorber accounting for 60% of the water absorbing material, water-absorbing acrylic resin accounting for 40%, and original mixed coal gas with water content of 40g/m3The water content in the original combustion air is 20g/m3The mixed gas and the combustion-supporting air are respectively two groups of U-shaped pipes of the natural water absorber, and after passing through the U-shaped pipes, the water content in the mixed gas is reduced to 3.5g/m3The water content in the combustion air is 2.3g/m3. The 45 steel billets are heated by adopting the coal gas passing through the natural water absorber, the heating system is 1200 ℃ multiplied by 2h, after the heating is finished, the temperature of the steel billets is cooled to room temperature by adopting water spraying, and the thickness of the oxide scale is measured to be 0.19 mm.
Comparative example 2
Heating Fe-9Cr-0.26Si steel billet with thickness of 150mm and width of 200mm and water content of 40g/m in the original mixed gas3The water content in the original combustion air is 20g/m3Heating the Fe-9Cr-0.26Si steel billet by using original mixed gas and original combustion air which are not subjected to dehydration treatment, wherein the heating system is 1200 ℃ multiplied by 2h, cooling the steel billet to room temperature by using water spraying after the heating is finished, and measuring the thickness of an oxide scale to be 0.65 mm.
Example 3
Heating stainless steel 1Cr18Ni9 steel billet with thickness of 300mm and width of 350mm, active alumina in the natural water absorber accounting for 70% of the volume of the water absorbing material, water-absorbing acrylic resin accounting for 30%, and original mixed coal gas with water content of 40g/m3The water content in the original combustion air is 20g/m3The mixed gas and the combustion-supporting air are respectively two groups of U-shaped pipes of the natural water absorber, and after passing through the U-shaped pipes, the water content in the mixed gas is reduced to 4g/m3The water content in the combustion air is 3g/m3. The 45 steel billets are heated by adopting the coal gas passing through the natural water absorber, the heating system is 1250 ℃ multiplied by 2.5h, after the heating is finished, the temperature of the steel billets is cooled to room temperature by adopting water spraying, and the thickness of the oxide scale is measured to be 0.16 mm.
Comparative example 3
Heating stainless steel 1Cr18Ni9 billet with thickness of 300mm and width of 350mmThe water content in the mixed coal gas is 40g/m3The water content in the original combustion air is 20g/m3Heating the Fe-9Cr-0.26Si steel billet by using original mixed gas and original combustion air which are not subjected to dehydration treatment, wherein the heating system is 1250 ℃ multiplied by 2.5h, cooling the steel billet to room temperature by using water spraying after heating is finished, and measuring the thickness of an oxide scale to be 0.45 mm.
To summarize the three groups of examples and comparative examples, the following are summarized:
comparing example 1 with comparative example 1, for the common No. 45 steel with the carbon content of 0.45%, the dehydrated coal gas and combustion air can reduce the thickness of the oxide scale from 0.68mm to 0.16mm, and the reduction range of the oxidation burning loss reaches 76%.
Comparing example 2 with comparative example 2, for the Fe-9Cr-0.26Si steel billet, the dehydrated coal gas and combustion air can reduce the thickness of the oxide scale from 0.65mm to 0.19mm, and the reduction range of the oxidation burning loss reaches 70%.
Comparing example 3 with comparative example 3, for stainless steel 1Cr18Ni9 billet, the dehydrated coal gas and combustion air can reduce the thickness of the oxide scale from 0.45mm to 0.16mm, and the reduction range of oxidation burning loss reaches 64%.
Therefore, the method has very obvious effect on reducing the oxidation burning loss. And most of water vapor in the coal gas and the combustion-supporting air is absorbed by the water absorbing material, and the dehydrated coal gas and the dehydrated combustion-supporting air heat the steel billet through the nozzle, so that the oxidation burning loss is reduced, and the heat value of the coal gas is also improved.
The invention adopts a plurality of U-shaped tubes and mixed water-absorbing materials, arrows in figure 1 show the flowing direction of coal gas or air, and after the coal gas and the air respectively pass through the plurality of U-shaped tubes according to the arrow direction, the water content in the coal gas and the air is from 10 to 50g/m3Down to less than 5g/m3In the combustion temperature range of 1100-1250 ℃, the thickness of the oxide scale of the billet is reduced by more than 50%; the natural water absorber has simple structure and convenient installation, does not greatly change the feeding system of the existing gas system treatment system of a steel rolling mill, and only needs to be additionally provided with the natural water absorber at the gas outlet part and the air inlet pipe; and isThe water absorbing material can be reused after being dried and dehydrated, so that the cost is reduced, and the material consumption is reduced.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. A natural water absorber is characterized in that a set of natural water absorber comprises at least two groups of adjacent inverted U-shaped tubes, the lower ends of the two groups of adjacent inverted U-shaped tubes are connected through a lower transverse tube (3), and water absorbing materials (6) are filled in the inverted U-shaped tubes.
2. The natural water absorber as claimed in claim 1, wherein the two ends of the lower horizontal pipe (3) are provided with water storage elbows (5), and the lower horizontal pipe (3) and the water storage elbows (5) are integrally in an H-shaped structure.
3. The natural water aspirator according to claim 2, characterized in that the inverted U-shaped tube comprises two vertical conical tubes (1) and an upper horizontal tube (2), and the top ends of the two conical tubes (1) are connected with the upper horizontal tube (2).
4. The natural water aspirator of claim 3, characterized in that the conical tube (1) is a conical structure with a wide top and a narrow bottom.
5. The natural water aspirator according to claim 4, characterized in that the conical tube (1), the upper cross tube (2) and the lower cross tube (3) are detachably connected through a pipe joint (7).
6. The natural water aspirator according to claim 5, characterized in that the stainless steel wire gauze pads (4) are arranged at the lower end of the conical tube (1) and the two ends of the lower horizontal tube (3).
7. The natural water absorber as claimed in claim 6, characterized in that the aperture of the stainless steel wire gauze pad (4) is less than 2 mm.
8. The natural water absorber as claimed in any one of claims 2 to 7, characterized in that the water absorbing materials (6) are respectively filled in the lower transverse pipes (3) of the conical pipes (1), and the filling amount of the water absorbing materials (6) is 1/3-1/2 of the volume of the inverted U-shaped pipes and the lower transverse pipes (3).
9. The natural water absorber as claimed in claim 1, wherein the water absorbing material (6) is composed of porous activated alumina particles and super absorbent acrylic resin particles, the porous activated alumina particles and the super absorbent acrylic resin particles are spherical particles with diameters of 3 mm-30 mm, and the volume ratio of the porous activated alumina particles in the water absorbing material (6) is 50-70%.
10. A method for reducing the oxidation burning loss of a hot rolled plate by using the natural water aspirator of any one of claims 1-9, which is characterized in that the method comprises passing gas and combustion air for heating a hot rolled steel billet through a set of natural water aspirators respectively, wherein the gas and the combustion air sequentially pass through a first vertical conical pipe (1), an upper transverse pipe (2), a second vertical conical pipe (1) and a lower transverse pipe (3) of the U-shaped pipe; after being dried by a natural water absorber, the water content in the coal gas and the combustion air is 10-50 g/m3Reduced to 5g/m3The dried coal gas and combustion air are used for heating the steel billet, and the thickness of the oxide skin is reduced by at least 50%.
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