press-fitted specimen

Technology areas

[0001]

The invention relates to the pressure steel applied to the kilns, coke ovens.

His innovations.

[0002]

Figure 1 shows a typical configuration of 1 case of furnaces applied pressure steel Coke. Coke is juxtaposed in numerous Chamber 1 was loaded with coal and coke production, this coal is carbonized by the heat from the combustion chamber 2 to. And remove the Chamber furnace lid 3 manufactured Coke is by the extruder to move through each Chamber pushed outside from the Chamber.

[0003]

May cause burns and caused damage or deformation metal protector 4 takes Coke, keeping the refractory bricks by age-related deterioration and fire bricks and be kept sealed in the Chamber 1, as shown in Figure 1 of the arrow furnace gas to leak and damage protector 4 vicious cycle. Also, sucked air in the Chamber when the Chamber pressure and negative pressure, due to this air is cooled bricks are thermal spalling damage refractory bricks. Damage to refractory brick and damage of the coke Chamber has been biting it, extrusion extruder due to arising 押shi詰ri. And cause the work to eliminate biting on refractory 押shi詰mari causes, coke, coke oven production stops. Therefore, you need to make it out of the coke furnace gas.

[0004]

So are the gaps between refractory and protector and pressure fitting pressure steel to make it out of the coke furnace gas. That is, consists of press-fitted specimen by filling in the gap, trying to seal the gap.

[0005]

Attempts to improve the sealing performance of this gap, improve the flow of press-fitted specimen has been made. For example the technology to improve liquidity in patent literature 1 pressure input materials with hollow spherical alumina is disclosed.

[0006]

However, there is a limit to the improvement of sealing alone to improve the flow of press-fitted specimen. Namely coke of kiln mouth narrowing in gap of complex shapes, just shape, prone, in the construction after the press-fitted specimen contracts due to dehydration.

Prior art documents

Patent documents

[0007]

Patent literature 1: special square 10-101442 No. Gazette

Summary of the invention

Inventors are trying to solve a problem

[0008]

Invention solve challenges to try is to provide pressure steel can improve the sealing of gaps in the kiln.

Means for resolving problems

[0009]

To resolve the problem the invention was granted a remarkable volume expansion of construction at press-fitted specimen for. I.e., press-fitted specimen according to 1 view invention, applied in the kiln in the 80 ° C-when heated at 500 ° C atmosphere temperature, heating earlier than 1. Press-fitted specimen with volumetric expansion of more than 3 times is provided.

Advantageous effects of invention

[0010]

Is press-fitted specimen of the invention during the construction of the kiln temperature 80 ° C-when heated at 500 ° C atmosphere temperature, heating earlier than 1. You can supplement the shape of press-fitted specimen due to dehydration shrinkage and press-fitted specimen from the volumetric expansion of more than three times that, and to improve the sealing of gaps in the kiln.

A brief description of the drawings

[0011]

In a cross section shows the General configuration of Coke [Figure 1].

For carrying out the invention

[0012]

Press-fitted specimen of the present invention is 80 ° C-when heated at 500 ° C atmosphere temperature, heating earlier than 1. With volume more than tripled to feature. This volume of the expansive (volume expansion) is the press-fitted specimen, 80 ° C-you can get by combining thermal expansion of encapsulating material to swell at 500 ° C. The expansion heat in thermal plasticity plastic body containing liquefied gas. I.e. at room temperature under pressure of liquefied gas in the liquid state is 80 ° C-to vaporize when heated to 500 ° C, and expanded rapidly. Front heated so that more than one... You can get the coefficient of volume expansion is more than three times. Volumetric expansion of the volumetric expansion of the upper limit is not specifically limited are expected to achieve as a press-fitted specimen real naturally and limit, for example 4 x or less.

[0013]

The requirements of the present invention is 1. Is the volumetric expansion, three times more than many other non-thermal expansion of blending method, for example Glycerin you can get by combining alcohols.

[0014]

As thermal plasticity plastic body to contain liquefied gases enumerated Isobutane, isopentane, trimethyl pentane. Vinylidene chloride or acrylonitrile, methyl methacrylate, metal Liron nitrile copolymer, cited as thermoplastics make up the thermal plasticity plastic body shell. That is not particularly limited thermal plasticity plastic body shape, in terms of fitting work sphere is preferable.

[0015]

Preferred scheme of press-fitted specimen of the present invention is described below.
(1) press-fitted specimen if volume 100 mass percent during the thermal plasticity plastic body 0... 5% or more, 3% less than the silicate salts containing 3% or more, 10% less than.
(2) press-fitted specimen if volume 100 mass percent during the thermal plasticity plastic body 2% or more, less than 7 weight percent, inorganic fiber quality thickening agent, 60% or more 1% or more, 10% less than blending. That without the combination of press-fitted specimen and added prior to the construction of the water.

[0016]

In the above formula (1) with silicate as binding agent. You can ensure the concrete strength by combining the silicates, can hold the sealing. In the above formula (1), 3 mass % with the silicate and maintaining sealing concrete strength 10 minutes longer. The silicate 10 mass % over slow heat.

[0017]

To get heat in the above formula (1), formulated with fire-resistant materials. As a refractory material, conductive molten or sintered alumina, mullite, synthetic mullite, mullite-alumina and magnesia - lime, magnesia, spinel, zirconia, Zirconia - mullite, and bauxite, from kyanite, sillimanite, Andrew site van sat shale, chamotte, pyrophyllite, silica, fused silica, temporarily fired alumina, Silica fume, zircon, chrome ore, silicon carbide, Silicon nitride, natural graphite, graphite, anthracite, and clay, A combination of one or more selected from the bentonite is mentioned. You may use chips of refractory materials, as these ingredients and use after the trash.

[0018]

You may further depending on need, the addition of thickening agents such as textiles and organic fiber, inorganic fiber, or anti-foaming agents, air-entraining and carboxyl methyl cellulose, methyl cellulose, dextrin, sodium alginate, ammonium alginate, welan gum, xanthan gum, starch, etc..

[0019]

In the above formula (2) inorganic fibers containing thickeners. You can improve the plasticity in the hot-press-fitted specimen in a mineral fiber that you can to ensure the sealed this. For example, if the furnace is deformed by the heat during the operation in formula (2) has the plasticity, high adaptability for deformation of the furnace, sealing due to deformation of the furnace to prevent. Inorganic fiber mass 60% under and not get a sufficient improvement in plasticity. Be considered inorganic fiber ceramic fiber, fiberglass, rock wool, carbon fiber, Wollastonite fibers, sepiolite, etc..

[0020]

In the above formula (2) thickening agent to improve dispersion of inorganic fiber to blend. Carboxyl methyl cellulose, methyl cellulose, dextrin, sodium alginate, ammonium alginate, welan gum, xanthan gum, starch is given as a thickening agent, but in terms of the dispersion of inorganic fibers preferred carboxyl methyl cellulose. In the above formula (2), 1 mass % is the thickener and dispersion of inorganic fiber, construction and poor. Thickening agent is more than 10% increases the viscosity decreased work efficiency, too.

[0021]

In addition, to further improve the dispersion of condensed low viscosity of dispersants such as phosphoric acid, glycol, polyether, polycarboxylic acid, POLYACRYLIC acid, melaminsulfone acid polymer, humic acid, alkyl sulfonic acids, phosphonic acids, aromatic sulfonic acid or synthetic polymers, starch ethers slump inhibitor and effects similar to those obtained from one or two or more then you can use.

[0022]

You can fire ingredients to get the heat resistance, in the above formula (2) the same formula (1).

[0023]

Also, the above formula (1) (2) can keep shape retentive by thermal plasticity plastic body due to thermal expansion. For this reason, to ensure shape retention of hydraulicity of aluminous cement binders added without good. That is, do not cure formula (1) (2) No hydraulic binding agents, so the addition of water. After mixing, in a sealed container at room temperature under 24 hours, shape retentive to ensure, by the addition of water that becomes possible. Also reduces the hassle of cleaning of hardened than the above formula (1) (2) the use, hydraulic binders.

[0024]

Press-fitted specimen of the present invention is an appropriate amount of water added as well as the traditional press-fitted specimen after kneading, fitting in the space of the kiln (construction part) will be. Is press-fitted specimen of the invention from having an excellent sealing performance, as the construction section sections specifically 30 mm width gap or crack in the ambient temperatures above 80 ° C, sealed in the conventional press-fitted specimen are difficult to apply in particular in turn.
Implementation example

[0025]

(Example 1)
About press-fitted specimen of each example comes from the composition shown in table 1, line rate, compression seal to assess how to measure the strength and coefficient of volume expansion, as well as the score.

[0026]

[Table 1]

[0027]

Using a, as shown in table 1 as refractory materials as clays, binders and lumpy stuff as silicates, thickener carboxylmethyl cellulose thermal plasticity plastic spheres as isopentane encapsulated.

[0028]

Rate and compression strength formulations of each example by addition of water given after kneading, 40 × 40 × casting into the mold of 160 mm, detained in 110 ° C×24 time drying after the escape frame and 1000 ° measured on the specimen obtained by C×3 time by firing.

[0029]

Calculated by dividing the casting size 20 mm x 20 mm x 80 mm = 32000 (3mm) out after 2 hours heated at 300 ° C for each frame type electric arc furnace and volumetric expansion formulations in each case by the addition of water in place after kneading, 20 mm x 20 mm x 80 mm-type frame casting cooling, and frame from the formwork removal, measure the outside dimensions of the height and width and length of the specimen and then calculated the volume calculated heating cooling after the volume (mm3) then.

[0030]

If evaluation of sealing the opening gap of 10 mm burner furnace was heated to 1000 ° C and leakage of flame is no longer producing States forced flames gushed from the gap, composition of each example in the prescribed additives of water after kneading, pressure transmission machine filling in of void that samples and Yes, if you just admitted leaking flame-the flame leak showed that x did.

[0031]

Score is Yes, triangle, x's were evaluated in three stages (Yes, triangle, x of bad ratings in order to show. ）。 The invention challenge sealing of the x's, score x tried. Also, sealing in the score if you also-tried. In addition to rate and compression strength value relative value, comprehensive evaluation of Yes,-evaluated. Examples 9, compressed because low strength score-tried. Example 10 a line rate value is greater because the score-tried.

[0032]

Example 1 ~ 10. 1 volumetric expansion. Meets the requirements of at least three times the score ○ or decrease was. Within the preferred formula (1) above, especially in examples 1-7 score is ○, and satisfactory results were obtained.

[0033]

On the other hand, comparative examples 1, 2, 1 is the coefficient of volume expansion. Less than three times the seal x became.

[0034]

(Example 2)
Dispersion of tacky and plasticity to evaluate press-fitted specimen of each example comes from the composition shown in table 2, as well as the same as example 1 volumetric expansion and sealing performance measurement and evaluation and the overall evaluation.

[0035]

[Table 2]

[0036]

As shown in table 2, as inorganic fiber ceramic and refractory raw materials as lumpy stuff, thickeners and the carboxyl methyl cellulose and low viscosity sauce used as repellent as a synthetic polymer, thermal plasticity plastic sphere containing isopentane.

[0037]

Dispersibility evaluation using, Inc. Ken mix tabletop mixer made love eikosha, composition of each addition of water given 2 minutes kneading to make ceramic Miyatake degree determined by touch. State has left about 1 cm agglomerated ceramic x, agglomerated ceramic remains in the small State in the State not have agglomerated ceramic ○ and the.

[0038]

Evaluation of adhesive with your fingers after mixing the sample, grasp what texture samples remain a sticky fingers x, slightly tacky in the bonding is not ○ an.

[0039]

Assessment of the plasticity, formulations of each example by addition of water in place after kneading, 20 x 20 x pull out after 2 hours heated at 300 ° C for each frame type electric arc furnace, casting into the mold of 80 mm, then cooling and frame from the formwork removal specimens to 0. Released the load when the contracts at the time under load of 1 MPa showed that 80 percent reconstruction reconstruction ○, 50% or more but less than 80% has been accepted, in the reconstruction of less than 50% of x tried.

[0040]

Score is Yes, triangle, x's were evaluated in three stages (Yes, triangle, x of bad ratings in order to show. ）。 The invention challenge sealing of the x's, score x tried. Otherwise, none of the dispersion of tacky, thermoplastic sealing performance evaluation of the evaluation results of worst things fit.

[0041]

Examples 11-21's Bulk modulus 1. Meets the requirements of at least three times the score ○ or decrease was. Located within the preferred formula (2) mentioned above in particular, examples 11-16 score is ○, and satisfactory results were obtained.

[0042]

On the other hand, comparing examples 3-6 is the coefficient of volume expansion 1. Less than three times the seal x became.

Of the claims

[Paragraph 1]

Press-fitted specimen will be applied to the kiln in the 80 ° C-when heated at 500 ° C atmosphere temperature, heating earlier than 1. Press-fitted specimen with volumetric expansion of more than three times.

[Paragraph 2]

80 ° C-encapsulating material to swell at 500 ° C thermal expansion of the above-mentioned thermal expansion of liquid thermal plasticity plastic body that Prof. gas in claim 1, in press-fitted specimen.

[Invoice section 3]

Thermoplastic plastics heat press-fitted specimen if volume 100 mass percent while the Prof. said gas was 0. Formulated to be 5% or more, 3% less than 3% or more, 10% less than the silicates in addition and to be formulated that claim 2, press-fitted specimen in.

[Paragraph 4]

Formulated to be 2% or more, less than 7 weight percent and thermal plasticity plastic body with Prof. wherein liquefied gas press-fitted specimen if volume 100 mass percent while further inorganic fiber thickening agent, 60% or more 1% or more, 10% less than and to be formulated that claim 2, press-fitted specimen described.

[Bill 5]

Be over 80 ° C temperature at the kiln, 30 mm width gap or crack in the press that claims 1 through 4 of press-fitted specimen described.