阅读说明：本技术 一种膜式内冷高温炉烟管道及制造方法 (Membrane type internal cooling high-temperature furnace smoke pipeline and manufacturing method thereof ) 是由 李继峰 于 2021-07-01 设计创作，主要内容包括：本发明公开了一种膜式内冷高温炉烟管道,其径向由内至外依次包括耐磨耐火浇注层、内保温层、膜式壁层、外保温层及金属铝壳层,膜式壁层包括多个呈周向布置的水冷无缝钢管、连接于水冷无缝钢管之间的扁钢、连通于水冷无缝钢管上、下端的环状集水箱,扁钢内壁上径向设有承载浇注层的托架及锚固钉,托架与锚固钉的内侧端固定于耐磨耐火浇注层内。本发明还公开了一种膜式内冷高温炉烟管道的制造方法。本发明具有调节烟气温度能力强、保温效果好,使用寿命长等优点。(The invention discloses a film type internal cooling high temperature furnace smoke pipeline which sequentially comprises a wear-resistant and fire-resistant pouring layer, an internal heat-insulating layer, a film type wall layer, an external heat-insulating layer and a metal aluminum shell layer from inside to outside in the radial direction, wherein the film type wall layer comprises a plurality of circumferentially arranged water-cooled seamless steel pipes, flat steel connected among the water-cooled seamless steel pipes and annular water collecting tanks communicated with the upper end and the lower end of the water-cooled seamless steel pipes, a bracket and anchoring nails for bearing the pouring layer are radially arranged on the inner wall of the flat steel, and the inner side ends of the bracket and the anchoring nails are fixed in the wear-resistant and fire-resistant pouring layer. The invention also discloses a manufacturing method of the smoke pipeline of the membrane type internal cooling high-temperature furnace. The invention has the advantages of strong capacity of adjusting the temperature of the flue gas, good heat preservation effect, long service life and the like.)

1. The utility model provides a membrane formula inner cooling high temperature furnace tobacco pipe, its characterized in that: the film type wall layer comprises a plurality of water-cooling seamless steel pipes which are circumferentially arranged, flat steel connected between the water-cooling seamless steel pipes, an annular water collecting tank arranged on the water-cooling seamless steel pipes, the lower end of the annular water collecting tank is communicated with the water-cooling seamless steel pipes, the water-cooling seamless steel pipes and the flat steel form a metal tubular structure integrally, a bracket and anchoring nails bearing the wear-resistant and fire-resistant pouring layer are welded on the inner wall of the flat steel in the radial direction, a plurality of rings of bearing steel rings are arranged on the upper surface of the inner side end of the bracket and fixedly arranged in the wear-resistant and fire-resistant pouring layer, nail claws are arranged on the inner side end of each anchoring nail and fixed in the wear-resistant and fire-resistant pouring layer, and the outer end of each anchoring nail penetrates through the inner.

2. The film type internal cooling high temperature furnace smoke pipeline according to claim 1, characterized in that: the bearing steel ring is formed by connecting a plurality of arc steel bars in an end-to-end spot welding manner.

3. The film type internally-cooled high-temperature furnace smoke pipeline as claimed in claim 2, wherein: and a plastic expansion sleeve is arranged outside the bearing steel ring.

4. The film type internal cooling high temperature furnace smoke pipeline according to claim 1, characterized in that: the claw of the anchoring nail is of a Y-shaped branched structure, and the branched end parts are respectively provided with a plastic expansion cap.

5. The film type internally-cooled high-temperature furnace smoke pipeline as claimed in claim 4, wherein: the nail claw is cut from the head by the steel bar to form a Y-shaped branched structure.

6. The film type internal cooling high temperature furnace smoke pipeline according to claim 1, characterized in that: and the anchoring nail at the rear side of the Y-shaped branched structure is also sleeved with a pressing sheet for flattening the inner heat-insulating layer.

7. The film type internal cooling high temperature furnace smoke pipeline according to claim 1, characterized in that: the inner heat insulation layer comprises a plurality of layers of heat insulation plates, and the heat insulation plate at the innermost layer is a hydrophobic heat insulation plate.

8. The film type internally-cooled high-temperature furnace smoke pipeline of claim 7, which is characterized in that: and a plurality of concave seams for bending are axially formed on the inner wall of the heat-insulation plate.

9. The method for manufacturing the smoke pipeline of the film type internal cooling high-temperature furnace according to claim 1, which is characterized by comprising the following steps:

a. welding a plurality of circumferentially arranged water-cooled seamless steel pipes into a metal tubular structure through flat steel with preset nail holes, respectively arranging annular water collecting tanks at the upper end and the lower end of each water-cooled seamless steel pipe, and communicating the water-cooled seamless steel pipes by adopting plug-in welding;

b. welding a bracket on the inner wall of the flat steel;

c. performing a hydrostatic test on the water-cooled seamless steel pipe and the annular water collecting tank;

d. laying an inner heat-insulating layer on the inner wall of the metal tubular structure, punching the inner heat-insulating layer through nail holes of flat steel, inserting anchoring nails with pressing sheets from the inner side of the inner heat-insulating layer to the outside, sequentially penetrating the inner heat-insulating layer and the corresponding nail holes, flattening the inner heat-insulating layer through the pressing sheets, and then welding the anchoring nails with the nail holes;

e. a bearing steel ring connected by arc steel bars in a spot welding manner is arranged on the upper surface of the inner side end of the bracket;

f. pouring a wear-resistant refractory layer on the inner side of the inner heat-insulation layer through a template, and pouring a Y-shaped branched structure of the bracket, the bearing round steel and the anchoring nails;

g. and (4) carrying out an integral hydrostatic test, and paving an outer heat-insulating layer and a metal aluminum shell layer after pressure test.

10. The method for manufacturing the smoke pipe of the film type internal cooling high-temperature furnace of claim 9, wherein: in step c, arranging a plastic expansion cap at the forked end part of the anchoring nail; in step d, a plastic expansion sleeve is sleeved on the bearing steel ring.

Technical Field

The invention belongs to a flue, and particularly relates to a smoke pipeline of a membrane type internal cooling high-temperature furnace and a manufacturing method thereof.

Background

In a fan coal mill direct-fired pulverizing system of a lignite boiler power plant, the temperature of a conveying medium of a high-temperature furnace smoke pipeline from a smoke extraction port of a lignite boiler to an inlet of a fan coal mill is up to 1100 ℃, and the design and manufacture of the current high-temperature furnace smoke pipeline have the following three forms:

the first is an internal heat preservation form, namely a smoke pipeline of a high-temperature furnace is formed by welding common carbon steel plates, and the interior of the smoke pipeline is made of refractory bricks or lined with heat preservation materials and wear-resistant refractory materials. During the starting and stopping processes of the boiler and the coal mill, the temperature of high-temperature smoke is changed sharply between 20 ℃ and 1100 ℃. Because the heat compensation capability of the heat insulation structure of the pipeline is poor, the refractory bricks or the heat insulation materials and the wear-resistant refractory materials are loosened after the pipeline runs for a period of time, and the phenomenon of falling off is generated, so that the wall of the carbon steel pipe is directly contacted with high-temperature flue gas, the pipeline is burnt out due to the fact that the pipeline cannot bear high temperature, air leakage is serious, the drying output of the coal mill is insufficient, the heat dissipation loss is increased, and the economical efficiency and the reliability of the running are reduced. In addition, as the wear-resistant refractory material and the fixed grabbing nails fall into the coal mill, the impeller and the striking plate of the coal mill are damaged, so that the furnace is shut down and shut down, and the maintenance workload, the maintenance cost and the danger degree are increased.

The second is an external heat preservation form, namely a high-temperature alloy steel pipe is adopted in a smoke pipeline of the high-temperature furnace, and a heat-resistant heat preservation material is coated outside the smoke pipeline. In the starting and stopping processes of a boiler and a coal mill, the cracking phenomenon of the pipe wall often occurs at the mixing chamber part at the upper part of the pipeline due to the influence of severe temperature change and the reasons of processing, manufacturing and the like. In the actual operation process, some pipelines have long cracks, the pipe parts of the supporting and hanging frames are welded, and the pipelines are locally broken or even sink when the pipelines are seriously broken, so that the shutdown and the machine halt are caused.

The third type is a smoke pipeline of a film type internal cooling high-temperature furnace appearing in the later period, the pipeline is of a circular section, the pipeline is formed by surrounding carbon steel small-diameter seamless steel pipes along the circumference, and the carbon steel small-diameter seamless steel pipes are continuously welded through flat steel. The film type inner-cooling high-temperature furnace has the advantages of large heat transfer area per unit length of the smoke pipe, long service life, capability of adjusting smoke temperature, high pressure bearing capacity, stable operation, reduced heat loss and improved economic benefit. However, the heat absorption amount of the cooling water in the pipeline is relatively large, which easily causes the loss of the heat of the furnace smoke, thereby affecting the drying effect of the lignite, in addition, the inner wall of the pipeline is directly contacted with the furnace smoke medium, the furnace smoke medium contains various large-particle dust, the flowing speed in the pipeline is relatively high, and the inner wall of the pipeline can be washed and corroded, thereby damaging the pipeline.

To sum up, the existing high-temperature furnace smoke pipeline has the problems of difficult design, large investment, severe operating conditions, large overhauling workload and the like.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a membrane type internal cooling high-temperature furnace smoke pipeline and a manufacturing method thereof, which can ensure the safety and reliability of the operation of the high-temperature furnace smoke pipeline, reduce the heat dissipation loss and have good heat preservation effect.

In order to solve the technical problems, the invention adopts the following technical scheme:

on the one hand, the smoke pipeline of the film type internal cooling high-temperature furnace comprises a wear-resistant and fire-resistant pouring layer, an internal heat-insulating layer, a film type wall layer, an external heat-insulating layer and a metal aluminum shell layer from inside to outside in sequence in the radial direction, wherein the film type wall layer comprises a plurality of water-cooling seamless steel pipes which are arranged in the circumferential direction, flat steel connected between the water-cooling seamless steel pipes, an annular water collecting tank arranged on the water-cooling seamless steel pipes and communicated with the water-cooling seamless steel pipes at the lower end, the water-cooling seamless steel pipes and the flat steel form a metal tubular structure integrally, a bracket and anchoring nails for bearing the wear-resistant and fire-resistant pouring layer are welded on the inner wall of the flat steel in the radial direction, a plurality of rings of bearing steel rings are arranged on the upper surface of the inner side end of the bracket and fixedly arranged in the wear-resistant and fire-resistant pouring layer, nail claws are arranged at the inner side end of the anchoring nails and fixedly arranged on the inner wall layer of the film type wall layer through the internal heat-insulating layer.

The bearing steel ring is formed by connecting a plurality of arc steel bars in an end-to-end spot welding manner.

And a plastic expansion sleeve is arranged outside the bearing steel ring.

The claw of the anchoring nail is of a Y-shaped branched structure, and the branched end parts are respectively provided with a plastic expansion cap.

The nail claw is cut from the head by the steel bar to form a Y-shaped branched structure.

And the anchoring nail at the rear side of the Y-shaped branched structure is also sleeved with a pressing sheet for flattening the inner heat-insulating layer.

The inner heat insulation layer comprises a plurality of layers of heat insulation plates, and the heat insulation plate at the innermost layer is a hydrophobic heat insulation plate.

And a plurality of concave seams for bending are axially formed on the inner wall of the heat-insulation plate.

On the other hand, the manufacturing method of the membrane type internal cooling high-temperature furnace smoke pipeline comprises the following steps:

a. welding a plurality of circumferentially arranged water-cooled seamless steel pipes into a metal tubular structure through flat steel with preset nail holes, respectively arranging annular water collecting tanks at the upper end and the lower end of each water-cooled seamless steel pipe, and communicating the water-cooled seamless steel pipes by adopting plug-in welding;

b. welding a bracket on the inner wall of the flat steel;

c. performing a hydrostatic test on the water-cooled seamless steel pipe and the annular water collecting tank;

d. laying an inner heat-insulating layer on the inner wall of the metal tubular structure, punching the inner heat-insulating layer through nail holes of flat steel, inserting anchoring nails with pressing sheets from the inner side of the inner heat-insulating layer to the outside, sequentially penetrating the inner heat-insulating layer and the corresponding nail holes, flattening the inner heat-insulating layer through the pressing sheets, and then welding the anchoring nails with the nail holes;

e. a bearing steel ring connected by arc steel bars in a spot welding manner is arranged on the upper surface of the inner side end of the bracket;

f. pouring a wear-resistant refractory layer on the inner side of the inner heat-insulation layer through a template, and pouring a Y-shaped branched structure of the bracket, the bearing round steel and the anchoring nails;

g. and (4) carrying out an integral hydrostatic test, and paving an outer heat-insulating layer and a metal aluminum shell layer after pressure test.

In step c, arranging a plastic expansion cap at the forked end part of the anchoring nail; in step d, a plastic expansion sleeve is sleeved on the bearing steel ring.

The membrane type internal cooling high-temperature furnace smoke pipeline and the manufacturing method thereof have the following advantages:

1. the smoke pipeline of the membrane type inner-cooling high-temperature furnace manufactured in a factory section can ensure the product quality of the pipeline, and avoids the defects that the quality of an original field high-altitude operation construction heat-insulating layer and an abrasion-resistant fire-resistant layer cannot be controlled;

2. the cooling water in the membrane wall layer can effectively solve the problem that when a local wear-resistant fire-resistant layer and a heat-insulating layer fall off in long-term operation, the metal pipe wall contacts with high-temperature flue gas to burn through the pipe wall, so that the defects of insufficient drying output of a coal mill, increased heat dissipation loss and reduced operation economy caused by air leakage of the burned through pipe wall are prevented, and serious accidents of unit shutdown caused by spontaneous combustion of lignite due to over-standard oxygen content in a flue are seriously caused;

3. by adopting the heat insulation plate instead of heat insulation cotton, the heat absorption capacity of cooling water in the membrane type wall can be reduced, the temperature of lignite powder-making drying furnace smoke is ensured, and the possibility of extracting the heat insulation cotton by negative pressure in a pipeline is also prevented;

4. the erosion and corrosion of the inner wall of the pipeline by high-temperature and high-speed furnace smoke can be prevented by selecting a casting material layer with wear-resistant and fire-resistant characteristics;

5. by selecting water with a certain temperature in a low frame system of the unit as cooling water in the membrane wall, not only can corrosion and scaling in a pressed piece be prevented, but also the cooling water with the temperature can prevent the flue gas from corroding the acid dew point of the metal surface on the inner side of the membrane wall pipeline;

6. by selecting the flattened V-shaped anchoring nail and not using the welding Y-shaped anchoring nail, intergranular corrosion of high-temperature flue gas to a welding seam can be prevented, and the gripping capability of the anchoring nail to a casting layer is ensured;

7. the external heat-insulating layer can insulate the cooling water and prevent the heat loss of the cooling water, so that the recycling of a cooling water recovery system at a certain temperature can be realized, and the effects of energy conservation and emission reduction are achieved;

8. the external heat-insulating layer can be fixedly protected by the metal aluminum shell layer, and meanwhile, the attractiveness is improved, so that the service life is prolonged;

9. because the volume weight of the wear-resistant and fire-resistant pouring layer is larger, the safety factor of bearing only by the anchoring nails under the high-temperature working condition is low, and the axial direction of the unit length can play a good role in supporting and fixing through the bracket and the bearing steel ring, thereby preventing the load displacement of the pouring layer under the high-temperature working condition and ensuring the integral safe operation of the support hanger and the pipeline system;

10. the anchor nail not only can play the effect of fixing and bearing the pouring layer, but also can play the effect of fixed several intraformational heated boards. Before the wear-resistant fire-resistant layer is poured, the heat-insulating plate can be pressed and flattened through the pressing sheets on the anchoring nails, so that the subsequent pouring of a pouring layer is facilitated;

11. by adopting the hydrophobic insulation board, the water in the casting material can be prevented from permeating into the inner insulation layer during casting, so that the insulation performance of the insulation material is influenced;

12. the anchoring nail and the bearing steel ring are provided with the plastic expansion cap and the plastic sleeve which are poured in the wear-resistant and fire-resistant layer, and after high-temperature furnace smoke is introduced, the plastic expansion cap and the plastic sleeve are melted to generate a gap, so that the anchoring nail or the bearing steel ring is prevented from damaging the pouring layer due to thermal expansion;

13. the axial and radial expansion gaps of the wear-resistant and fire-resistant pouring layer are formed, so that the pouring layer can be effectively absorbed by the thermal expansion damage of the high-temperature working condition pouring layer.

Drawings

The invention is described in detail below with reference to the following figures and detailed description:

FIG. 1 is a schematic radial cross-sectional view of a smoke duct of the membrane type internal cooling high temperature furnace of the present invention;

FIG. 2 is a sectional view taken along line A-A of FIG. 1;

fig. 3 is a schematic structural view of the insulation board of the present invention before being bent into an arc shape.

Detailed Description

The film type internal cooling high temperature furnace smoke pipeline of the invention is shown in figures 1-2, which comprises a wear-resistant fire-resistant pouring layer 1 (meeting the index of refractoriness being more than or equal to 1700 ℃ and compressive strength being more than or equal to 40 Mpa) in turn from inside to outside in the radial direction, an inner heat-insulating layer 2 (adopting materials such as ceramic fiber and the like), a film type wall layer 3, an outer heat-insulating layer 4 (adopting materials such as rock wool and the like) and a metal aluminum shell layer 5 (adopting materials such as aluminum skin and the like), wherein the film type wall layer 3 comprises a plurality of circumferentially arranged water-cooled seamless steel pipes 31 (adopting materials such as seamless steel pipes GB5310 and the like), flat steels 32 (such as Q235B materials and the like) connected between the water-cooled seamless steel pipes 31, annular water collection tanks 33 communicated with the upper end and the lower end of the water-cooled seamless steel pipes 31 (only the annular water collection tank 33 at the lower end is shown in figure 2), the water-cooled seamless steel pipes 31 and the flat steels 32 integrally form a metal tubular structure, and the water-cooled seamless steel pipes 31 are axially circulated and cooled seamless steel pipes 31 through the annular water collection tanks 33, thereby playing the role of regulating the temperature of the furnace smoke in the pipeline; and a bracket 6 and an anchoring nail 7 made of high-temperature resistant materials are radially and fixedly arranged on the inner wall of the flat steel 32, the anchoring nail 7 is correspondingly arranged above and below the bracket 6, a plurality of rings of bearing steel rings 8 (two rings are shown in figures 1 and 2) are arranged on the upper surface of the inner side end of the bracket 6 and are cast in the wear-resistant and fire-resistant casting layer 1 together with the inner side end of the bracket 6, the inner side end of the anchoring nail 7 is provided with a nail claw and is fixed in the wear-resistant and fire-resistant casting layer 1, and the outer side end penetrates through nail holes in the inner heat-insulating layer 2 and the flat steel 32 and fixes the inner heat-insulating layer 2 on the inner wall of the membrane wall layer 3. The bearing steel ring 8 can be formed by connecting a plurality of arc steel bars in an end-to-end spot welding manner, when thermal expansion and cold contraction occur, the welding position can automatically fracture, and the damage to a pouring layer caused by thermal stress can be freely eliminated; the claw of the anchoring nail 7 is of a Y-shaped branched structure and plays a role in anchoring with the wear-resistant and fire-resistant pouring layer 1, the Y-shaped branched structure can be formed by flattening high-temperature-resistant round steel and shearing from the head, and the potential hazards that the claw is broken and the like due to intergranular corrosion of a welding seam caused by high-temperature smoke formed by welding are avoided. Bearing steel ring 8 and locating outward and having plastic expansion cover 81, the branching tip of anchor nail 7 is equipped with plastics expansion cap 71 respectively, so pour back in wear-resisting fire-resistant pouring layer 1, when leading to high temperature flue-gas back, plastics expansion cap 71, plastic expansion cover 81 can melt in order to produce the clearance, avoid because of expending with heat and contract with cold messenger anchor nail 7 or bearing steel ring 8 destroys wear-resisting fire-resistant pouring layer 1. In addition, the inner heat-insulating layer 2 comprises a plurality of layers of heat-insulating plates 21, the heat-insulating plate at the innermost layer is a hydrophobic heat-insulating plate 22, and the function of preventing moisture of the casting material from permeating into the inner heat-insulating layer 2 can be achieved when the wear-resistant refractory material is cast, so that the heat-insulating property of the heat-insulating material is ensured; as shown in fig. 3, all the insulation boards 21 including the hydrophobic insulation board 22 may be rectangular flat boards, and a plurality of concave slits 23 are axially formed in the inner walls of the rectangular flat boards, so that the insulation boards 21 can be bent inward into arc-shaped boards through the concave slits 23 to be laid in the membrane wall pipeline; the Y form bifurcation structure rear side cover of anchor nail 7 is equipped with the preforming 72 that is used for compressing tightly interior heat preservation 2 that flattens, and the great contact surface of preforming 72 can compress tightly the heated board and flatten when passing several layers of heated board through anchor nail 7, is favorable to follow-up wear-resisting refractory material's pouring.

The manufacturing method of the smoke pipeline of the membrane type internal cooling high-temperature furnace comprises the following steps:

a. welding a plurality of circumferentially arranged water-cooled seamless steel pipes 31 and pre-perforated flat steel 32 into a metal membrane wall pipeline structure through welding equipment and tools, and respectively communicating annular headers 33 with the water-cooled seamless steel pipes 31 at two ends of the water-cooled pipes in an insertion welding mode;

b. welding a bracket 6 on the flat steel on the inner wall of the membrane wall pipeline;

c. performing a hydrostatic test on the water-cooled seamless steel pipe 31 and the annular headers 33 (pressed pieces) at the two ends;

d. the inner heat-insulating layer 2 is paved on the inner wall of the metal film type wall pipeline structure, the inner heat-insulating layer 2 is punched inwards from the outside of the flat steel by a long drill through the nail hole of the flat steel 32, the anchoring nail 7 with the pressing sheet 72 and the plastic expansion cap 71 is inserted outwards from the inner side of the inner heat-insulating layer 2 through the punching hole of the inner heat-insulating layer and is pressed and flattened to form the multilayer heat-insulating plate 21, and then the nail hole of the flat steel 32 is welded with the root part of the anchoring nail 7;

e. the upper surface of the inner side end of the bracket 6 is provided with bearing high-temperature round steel 8 which is formed by connecting arc round steel in a spot welding way and is provided with a plastic expansion sleeve 81;

f. pouring the wear-resistant refractory layer 1 on the inner side of the inner heat-insulating layer 2 through a template, and pouring a Y-shaped branched structure of the bracket 6, the bearing round steel 8 and the anchoring nail 7;

g. and after the pipe sections of the smoke pipes of the membrane type internal cooling high-temperature furnace produced in the factory are completely installed on site, performing an integral hydraulic test on the pressed parts of the smoke pipes of the membrane type internal cooling high-temperature furnace, and finally laying an external heat insulation layer 4 and a metal aluminum shell layer 5 after the pressure test.

However, those skilled in the art should realize that the above embodiments are illustrative only and not limiting to the present invention, and that changes and modifications to the above described embodiments are intended to fall within the scope of the appended claims, provided they fall within the true spirit of the present invention.