CN104293997A - Blocking structure for air heating furnace bottom air leakage - Google Patents
Blocking structure for air heating furnace bottom air leakage Download PDFInfo
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- CN104293997A CN104293997A CN201310303733.8A CN201310303733A CN104293997A CN 104293997 A CN104293997 A CN 104293997A CN 201310303733 A CN201310303733 A CN 201310303733A CN 104293997 A CN104293997 A CN 104293997A
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Abstract
The invention discloses a blocking structure for air heating furnace bottom air leakage. The blocking structure comprises a concrete foundation. A sizing block and a packing layer are arranged on the concrete foundation, are provided with an air heating furnace bottom. A groove located in the outer side of the air heating furnace bottom edge is formed in the concrete foundation, a circle of steel plate is welded to the air heating furnace bottom edge, the lower end of the steel plate stretches into the groove, and the groove is filled with sealing materials. In the process of construction, sealing operation can be finished while production is carried out under the premise that a worker does not need to enter a furnace and the furnace does not need to be stopped. The production time of an air heating furnace is shortened, the time taken to maintain the air heating furnace and the machine-stopping time are shortened, and the purpose of sealing leaking portions in the process of producing is achieved.
Description
Technical field
The present invention relates to the gas leakage plugging structure of hotblast stove, specifically refer to the plugging structure that a kind of hotblast stove furnace bottom leaks gas and implementation method.
Background technology
Hotblast stove starts widespread use in late 1970s in China, and it has become the regeneration product of electric heat source and conventional vapor power heat source in many industries.By long production practice, it has been recognized that to only have and utilize hot blast could improve heat utilization efficiency and hot working effect larger as medium and carrier.Traditional electrical thermal source and steam thermal power often configure multiple stage recirculation blower in course of conveying, make it final or indirect formation hot blast and carry out operation of drying or heat.Obviously there is shortcomings such as wasting energy and cause auxiliary facility is too much, complex technical process in a large number in this process.And larger problem is, this thermal source for that requirement needing comparatively high temps drying or baking operation, is then felt simply helpless.For these practical problemss through concentrating on studies for many years, finally develop the dark JDC series helix finned tube heat exchange indirect hot air stove by users at home and abroad welcome and JDC series high purification direct type hotblast stove.The effect of iron-smelting blast furnace hotblast stove is blast heating to the temperature required, in order to improve the returns and efficiency of blast furnace; It is by the work of " accumulation of heat " principle.Burn coal gas in combustion chamber, and high-temp waste gas is by checker brick and make it accumulation of heat, and after checker brick fully heat, hotblast stove just can change air-supply into, and now each valve of respecting combustion cuts out, and each valve of blowing is opened, and cold wind is heated through checker brick and sends.Blast furnace be equipped with 3-4 seat hotblast stove/' single stove air-supply " time, two or three heating, an air-supply; Change in turn/' air-supply in parallel " time, two heating.
Current hotblast stove is normally arranged on concrete foundation parallels, between concrete foundation and base plate, use the microlith heat resistance concrete of C10 as packing layer, because its intensity is lower, compaction rate is also lower, as base plate a part existing defects in process of production causes gas leakage, very easily produce the illusion of furnace bottom surrounding in gas leakage, and from shutoff and difficulty thereof technical standpoint and economic angle, although sometimes do not affect production, great hidden danger is brought to long-term production work.The method of current solution gas leakage has two kinds: in hotblast stove stove, carried out secondary furnace bottom mud jacking with high-grade cement mortar repair test, but effect is undesirable; Anhydrous phenol formaldehyde resin repairing technique, the program is in hotblast stove stove, utilize construction joint to carry out the press-in of anhydrous phenol formaldehyde resin, make anhydrous phenol formaldehyde resin fill crack, but be subject to that densify degree is low, material easily cracks, sealing material insecure, air leakage bonding with metallic object hour just extremely difficulty be pressed into and be difficult to successfully.
summary of the invention
The plugging structure that the object of the present invention is to provide a kind of hotblast stove furnace bottom to leak gas and implementation method, solve the problem of current hotblast stove furnace bottom gas leakage, reaches and do not stop production and realize the object of shutoff.
Object of the present invention is achieved through the following technical solutions:
A kind of plugging structure of hotblast stove furnace bottom gas leakage, comprise concrete foundation, concrete foundation is provided with parallels and packing layer, parallels and packing layer are provided with hotblast stove furnace bottom, concrete foundation offers the groove be positioned at outside hotblast stove furnace bottom edge, hotblast stove furnace bottom edge is welded with a circle steel plate, and the lower end of steel plate is stretched in groove, in groove, be filled with sealing material.Owing to there being the existence of parallels and packing layer between hotblast stove furnace bottom and concrete foundation, the thickness of parallels is generally 50 ~ 70mm, and, packing layer adopts the microlith heat resistance concrete of C10 to make, its intensity itself is lower, and vibrating not through vibrating head, degree of compactness is poor, its area leaked out is larger, technical scheme of the present invention adopts in concrete foundation, offer a circle groove, groove is positioned at the outside at hotblast stove furnace bottom edge, then at the edge of hotblast stove furnace bottom welding one circle steel plate, steel plate is incorporated in groove, sealing filling is carried out with sealing material in groove, in the solution of the present invention, adopt at hotblast stove furnace bottom welding steel, and form steel plate is incorporated in groove, the area leaked out is reduced greatly, the area that leaks out is reduced to steel plate and the interval area between parallels and packing layer from the cylinder area between original hotblast stove furnace bottom and concrete foundation, after area reduces, the area of shutoff is needed to reduce, reduce the degree of difficulty of shutoff, this gap is crammed by recycling sealing material, just can complete the shutoff of gas leakage, and, the approach of gas is spilt from parallels and packing layer horizontal direction by direct before leaking gas, change into present first level and enter gap between steel plate and hotblast stove furnace bottom, then move down, arrive the gap bottom steel plate and between concrete foundation, then move up from the gap between steel plate and sealing material, only have and could form gas leakage through the gap sealing material and steel plate, in the process, the gas direction of gas leakage changes three times, the change in direction each time all can reduce its kinetic energy, reduce it and impact the ability forming gap, so can realize the sealing of hotblast stove furnace bottom gas leakage, simultaneously, in construction process, do not need to enter in stove yet, do not need stopping production operation, sealing operation can be completed while production, improve the production time of hotblast stove, reduce the maintenance off-time of hotblast stove, reach the object of production limit, limit sealing and plugging.
Described sealing material forms bottom sealing ply and top layer sealing ply in groove.Further, in order to ensure the sealing property after groove filling, adopting two-layer sealed structure, i.e. the structure of bottom sealing ply and top layer sealing ply, utilizing the different advantages of different sealing materials to combine, achieve the stopping property of gas.
Described bottom sealing ply is made up of SHB anchoring adhesive.Specifically, bottom sealing ply needs to have higher intensity, through the test of many times of applicant, final selection SHB anchoring adhesive makes bottom sealing ply, SHB anchoring adhesive has higher intensity, and have bonding strength high, as pre-buried, ambient cure, process of setting is shunk little, heat resistance is good, can weld after burying muscle, weather resistance, good weatherability, anti-aging, media-resistant (acid, alkali, water) performance is good, toughness after solidification, impact resistance is excellent, not containing volatile solvent, asepsis environment-protecting, A, B component is joined wide compared with ratio, the features such as easy construction, be suitable for the sealing of hotblast stove furnace bottom gas leakage structure, and setting rate is fast, circulation air feed is only utilized to implement 2 hour off time, do not need to stop production and just can complete solidifying of bottom sealing ply.
The described bottom sealing ply be made up of SHB anchoring adhesive, its thickness is 70 ~ 100mm.Specifically, in order to keep good adhesiveproperties, the thickness of bottom sealing ply should be comparatively suitable when 70 ~ 100mm, when its thickness is less than 70mm, be difficult to ensure bottom sealing ply and the bonding firmness between steel plate, and when thickness is greater than 100mm, its bonding firmness is not significantly increased again, belong to redundancy waste.
Described top layer sealing ply is made up of epoxy anchoring adhesive.Further, applicant finds in the operation and experimentation of reality, although it is high that the SHB anchoring adhesive of bottom sealing ply solidifies rear intensity, but the fine cracks of Ren Ranyou transverse direction, in order to overcome this defect, applicant finds through research repeatedly, can one deck top layer sealing ply be set on bottom sealing ply, top layer sealing ply adopts epoxy anchoring adhesive to make, the advantage of crackle is not had after utilizing epoxy anchoring adhesive to solidify, just can overcome the fine cracks of SHB anchoring adhesive, ensure bonding firm one-tenth degree simultaneously.
The described top layer sealing ply be made up of epoxy anchoring adhesive, its thickness is 10 ~ 30mm.Further, in order to optimize the structure of top layer sealing ply, repetition test through applicant finds, when the thickness of top layer sealing ply is less than 10mm, its area is large compared with its thickness, easily produces shrinkage crack, when thickness is greater than 30mm, also easily crack, therefore adopt thickness to be limited to the technique means of 10 ~ 30mm, ensure its seal degree.
The width of described groove is 80 ~ 100mm.Further, for the ease of construction, the width of groove is comparatively practical when 80 ~ 100mm, if its width is less than 80mm, is not easy to construction, is greater than the increase that 100mm can cause again packing material, adds cost.
An implementation method for hotblast stove furnace bottom gas leakage plugging structure, at place's formation cavity volume that leaks out of hotblast stove furnace bottom, arranges a seal to this cavity volume, then seals sealing mouth, complete sealing.The present invention is shown in seam leak stopping, mode from inner grouting leak-stopping relative to current, the form that employing guides air leak and closes, draws the port of leak stopping, utilizes airtight cavity to carry out envelope gas, the difficulty of sealed volume is far smaller than shutoff crack simultaneously, more easily realizes.
This implementation method specifically comprises the following steps of carrying out successively:
A () cuts out a groove that 80 ~ 100mm is wide, 80 ~ 130mm is dark for one week along hotblast stove furnace bottom in concrete foundation, and rejected by the concrete in groove;
B the steel plate that length is equal with hotblast stove furnace bottom girth is arranged on outside hotblast stove furnace bottom by (), the height that steel plate stretches into groove is 70 ~ 100mm;
(c) by Plate Welding outside hotblast stove furnace bottom;
E (), after confirmation weld seam does not have breakthrough, adds SHB anchoring adhesive in groove, form bottom sealing ply, its thickness is 70 ~ 100mm;
F () completed 24 as a child in step (e), bottom sealing ply adds epoxy anchoring adhesive and forms top layer sealing ply, its thickness is 10 ~ 30mm.
Implementation method of the present invention, complete under hotblast stove carries out normal production scenarios, stop production relative to current hotblast stove, the leak stopping mode of injection of carrying out from hotblast stove inside being in the milk and realize for technique, do not affect the normal use of hotblast stove, there is outstanding substantive distinguishing features, and achieve the actual effect do not stopped production, there is significant progress, successfully solve a difficult problem for hotblast stove gas leakage, eliminate the potential safety hazard of subsequent production.
Before carrying out step (e), also carry out following steps (d): polishing rust cleaning is carried out to steel plate, and keep groove to clean.Further, welding, the arrangement of steel plate need the regular hour, and inherently may impurity be there is in steel plate, in order to improve the bonding force between steel plate and sealing material, avoid the bonding unstable problem that the materials such as iron rust cause, before packing matcrial, need to carry out grinding process to steel plate, not only to remove the iron rust of surface of steel plate, and spot, impurity will be removed, then utilize pressurized air to clean groove, when ensureing that sealing material is clogged, in groove, there is no impurity, improve the bonding force between sealing material and steel plate.
In step (c), be fillet weld between steel plate and hotblast stove furnace bottom; Weld bead height is identical with the thickness of steel plate.Further, adopt the form of fillet weld, utilize the height of weld seam identical with the thickness of steel plate, can ensure that the voltage endurance capability of commissure is identical with steel plate, defect can not be formed, after welding, need to check whether weld seam has breakthrough, if had, then time update, again weld, until without any breakthrough, the sealing of gas could be used for.
The present invention compared with prior art, has following advantage and beneficial effect:
The plugging structure of a kind of hotblast stove furnace bottom gas leakage of 1 the present invention, adopt at hotblast stove furnace bottom welding steel, and form steel plate is incorporated in groove, the area leaked out is reduced greatly, the area that leaks out is reduced to steel plate and the interval area between parallels and packing layer from the cylinder area between original hotblast stove furnace bottom and concrete foundation, after area reduces, the area of shutoff is needed to reduce, reduce the degree of difficulty of shutoff, this gap is crammed by recycling sealing material, just can complete the shutoff of gas leakage, and, the approach of gas is spilt from parallels and packing layer horizontal direction by direct before leaking gas, change into present first level and enter gap between steel plate and hotblast stove furnace bottom, then move down, arrive the gap bottom steel plate and between concrete foundation, then move up from the gap between steel plate and sealing material, only have and could form gas leakage through the gap sealing material and steel plate, in the process, the gas direction of gas leakage changes three times, the change in direction each time all can reduce its kinetic energy, reduce it and impact the ability forming gap, so can realize the sealing of hotblast stove furnace bottom gas leakage, simultaneously, in construction process, do not need to enter in stove yet, do not need stopping production operation, sealing operation can be completed while production, improve the production time of hotblast stove, reduce the maintenance off-time of hotblast stove, reach the object of production limit, limit sealing and plugging,
The implementation method of a kind of hotblast stove furnace bottom gas leakage of 2 the present invention plugging structure, seam leak stopping, mode from inner grouting leak-stopping is seen relative to current, the form that employing guides air leak and closes, the port of leak stopping is drawn, airtight cavity is utilized to carry out envelope gas, the difficulty of sealed volume is far smaller than shutoff crack simultaneously, more easily realizes;
The implementation method of a kind of hotblast stove furnace bottom gas leakage of 3 the present invention plugging structure, complete under hotblast stove carries out normal production scenarios, stop production relative to current hotblast stove, the leak stopping mode of injection of carrying out from hotblast stove inside being in the milk and realize for technique, do not affect the normal use of hotblast stove, there is outstanding substantive distinguishing features, and achieve the actual effect do not stopped production, there is significant progress, successfully solve a difficult problem for hotblast stove gas leakage, eliminate the potential safety hazard of subsequent production.
Accompanying drawing explanation
Fig. 1 is structure sectional view of the present invention.
Mark and corresponding component title in accompanying drawing:
1-concrete foundation, 2-parallels and packing layer, 3-hotblast stove furnace bottom, 4-steel plate, 5-bottom sealing ply, 6-top layer sealing ply, 7-hotblast stove structure in the stove.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment one
Certain 1260m built for 2012
3in blast furnace engineering, finding that 3 hotblast stove furnace bottoms all exist gas leak phenomenon when trying out, giving to produce from now on and bringing potential safety hazard, through measuring and calculating air leakage 1m
3/ min, body of heater outer top temperature 55 DEG C, body of heater operating pressure 0.3MP, to this, company organization technician discusses solution and under the suggestion of correlation technique expert at home, carried out secondary furnace bottom mud jacking and repaired test, but effect is undesirable with high-grade cement mortar; Quoted again the anhydrous phenol formaldehyde resin repairing technique of certain famous steel mill exploitation domestic afterwards, but eventually because densify degree is bad, material cracks or sealing material is bonding with metallic object insecure and failed.For the operating mode problem that this is concrete, applicant, after research repeatedly and experiment, determines that crack is introduced cavity volume, sealed the problem that the mode of this cavity volume solves gas leakage by employing.Specify following construction technology and solution:
(a) in concrete foundation 1 along hotblast stove furnace bottom within 3 one weeks, cut out 80mm wide × groove that 100mm is dark, and the concrete in groove to be rejected;
B thick for wide for 150mm × 10mm, that length is equal with hotblast stove furnace bottom 3 girth steel plate 4 is arranged on outside hotblast stove furnace bottom 3 by (), the height that steel plate 4 stretches into groove is 100mm, exposes 50mm in concrete foundation 1;
C steel plate 4 is welded on outside hotblast stove furnace bottom 3 by (), weld seam requires: fillet weld; Weld bead height is identical with steel plate 4 thickness;
D () carries out polishing rust cleaning to steel plate 4, and keep groove to clean, before packing matcrial, need to carry out grinding process to steel plate 4, not only to remove the iron rust on steel plate 4 surface, and spot, impurity will be removed, then utilize pressurized air to clean groove, there is no impurity in groove when ensureing that sealing material is clogged, improve the bonding force between sealing material and steel plate 4;
E () after in confirmation, weld seam do not have breakthrough, when hotblast stove is in 2 hour off time of normal circulation air feed, in groove, add SHB anchoring adhesive, form bottom sealing ply 5, its thickness is 80mm;
F () completed 24 as a child in step (e), bottom sealing ply 5 adds epoxy anchoring adhesive and forms top layer sealing ply 6, its thickness is 20mm.
Embodiment two
As shown in Figure 1, according to the structure that the method for embodiment one obtains, the model of groove be 80mm wide × 100mm, the model of steel plate 4 be 150mm wide × 10mm is thick, its length is equal with hotblast stove furnace bottom 3 girth, according to the construction progress of reality, different models can be adopted, do not need to stop production to hotblast stove, do not need to operate hotblast stove structure in the stove 7 yet, hot gas in hotblast stove is by the gap of hotblast stove structure in the stove 7, the gap of hotblast stove furnace bottom 3 enters into the gap of parallels and packing layer 2, and be sealed in steel plate 4, concrete foundation 1, in the cavity volume that hotblast stove furnace bottom 3 is formed, gap between steel plate 4 and concrete foundation 1 utilizes sealing material just can realize sealing, bonding very firm with between steel plate 4 of the bottom sealing ply 5 utilizing SHB anchoring adhesive to make, its thickness of bottom sealing ply 5 is 80mm, according to practice of construction situation, certain fluctuation can be there is in thickness, also belong to normal, although SHB anchoring adhesive can produce tiny crackle, but crackle general orientation is all horizontal, namely perpendicular to the direction of steel plate, the top layer sealing ply 6 utilizing epoxy anchoring adhesive to make just can solve these tiny crackles completely, the thickness of top layer sealing ply is 20mm, also can there is certain floating, reach the object of sealing.
The above is only preferred embodiment of the present invention, not does any pro forma restriction to the present invention, every according in technical spirit of the present invention to any simple modification, equivalent variations that above embodiment is done, all fall within protection scope of the present invention.
Claims (10)
1. the plugging structure of a hotblast stove furnace bottom gas leakage, comprise concrete foundation (1), concrete foundation (1) is provided with parallels and packing layer (2), parallels and packing layer (2) are provided with hotblast stove furnace bottom (3), it is characterized in that: in concrete foundation (1), offer the groove be positioned at outside hotblast stove furnace bottom (3) edge, hotblast stove furnace bottom (3) edge is welded with a circle steel plate (4), the lower end of steel plate (4) is stretched in groove, in groove, be filled with sealing material.
2. the plugging structure of a kind of hotblast stove furnace bottom gas leakage according to claim 1, is characterized in that: described sealing material forms bottom sealing ply (5) and top layer sealing ply (6) in groove.
3. the plugging structure of a kind of hotblast stove furnace bottom gas leakage according to claim 2, is characterized in that: described bottom sealing ply (5) is made up of SHB anchoring adhesive.
4. the plugging structure of a kind of hotblast stove furnace bottom gas leakage according to claim 3, is characterized in that: the described bottom sealing ply (5) be made up of SHB anchoring adhesive, its thickness is 70 ~ 100mm.
5. the plugging structure of a kind of hotblast stove furnace bottom gas leakage as claimed in any of claims 2 to 4, is characterized in that: described top layer sealing ply (6) is made up of epoxy anchoring adhesive.
6. the plugging structure of a kind of hotblast stove furnace bottom gas leakage according to claim 5, is characterized in that: the described top layer sealing ply (6) be made up of epoxy anchoring adhesive, its thickness is 10 ~ 30mm.
7. the plugging structure of a kind of hotblast stove furnace bottom gas leakage as claimed in any of claims 1 to 4, is characterized in that: the width of described groove is 80 ~ 100mm.
8. an implementation method for hotblast stove furnace bottom gas leakage plugging structure, is characterized in that: at place's formation cavity volume that leaks out of hotblast stove furnace bottom (3), arrange a seal, then seal sealing mouth, complete sealing to this cavity volume.
9. the implementation method of a kind of hotblast stove furnace bottom gas leakage plugging structure according to claim 8, it is characterized in that, this implementation method specifically comprises the following steps of carrying out successively:
A () cuts out a groove in (3) one weeks along hotblast stove furnace bottom in concrete foundation (1), and rejected by the concrete in groove;
B steel plate (4) equal with hotblast stove furnace bottom (3) girth for length is arranged on hotblast stove furnace bottom (3) outside by (), the height that steel plate (4) stretches into groove is 70 ~ 100mm;
C steel plate (4) is welded on hotblast stove furnace bottom (3) outside by ();
E (), after confirmation weld seam does not have breakthrough, adds SHB anchoring adhesive in groove, form bottom sealing ply (5), its thickness is 70 ~ 100mm;
F () completed 24 as a child in step (e), form top layer sealing ply (6) at the upper epoxy anchoring adhesive that adds of bottom sealing ply (5), its thickness is 10 ~ 30mm.
10. the implementation method of a kind of hotblast stove furnace bottom gas leakage plugging structure according to claim 9, is characterized in that, before carrying out step (e), also carry out following steps (d): carry out polishing rust cleaning to steel plate, and keep groove clean.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109825658A (en) * | 2019-02-28 | 2019-05-31 | 中国十九冶集团有限公司 | The method that processing hot wind drop-bottom leaks out |
| CN109929956A (en) * | 2019-04-16 | 2019-06-25 | 北京瑞普同创科技发展有限公司 | Smelt iron the online controlling device of hot-blast stove basis blowby compressed gas and installation method |
| CN110656213A (en) * | 2019-10-30 | 2020-01-07 | 陕西龙门钢铁有限责任公司 | Blast furnace hot blast stove foundation air leakage repairing structure and construction method thereof |
| CN110863511A (en) * | 2019-12-02 | 2020-03-06 | 南京联合荣大工程材料有限责任公司 | Method for repairing blast of furnace base of hot blast furnace |
| CN114774607A (en) * | 2022-04-24 | 2022-07-22 | 北京首钢建设集团有限公司 | Hot blast stove bottom structure and welding method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109825658A (en) * | 2019-02-28 | 2019-05-31 | 中国十九冶集团有限公司 | The method that processing hot wind drop-bottom leaks out |
| CN109929956A (en) * | 2019-04-16 | 2019-06-25 | 北京瑞普同创科技发展有限公司 | Smelt iron the online controlling device of hot-blast stove basis blowby compressed gas and installation method |
| CN110656213A (en) * | 2019-10-30 | 2020-01-07 | 陕西龙门钢铁有限责任公司 | Blast furnace hot blast stove foundation air leakage repairing structure and construction method thereof |
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| CN114774607A (en) * | 2022-04-24 | 2022-07-22 | 北京首钢建设集团有限公司 | Hot blast stove bottom structure and welding method thereof |
| CN114774607B (en) * | 2022-04-24 | 2023-09-15 | 北京首钢建设集团有限公司 | Furnace bottom structure of hot blast furnace and welding method thereof |
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