CN214371802U - Electric furnace high-temperature flue gas waste heat steam boiler - Google Patents

Abstract

The utility model discloses an electric stove high temperature flue gas waste heat steam boiler, it belongs to boiler trade technical field. It has solved the not enough defect of recycle that the waste heat of traditional electric stove flue gas exists among the prior art. The main structure of the energy-saving boiler comprises an evaporation pipe group, a light pipe membrane type wall, a centralized descending pipe, a hearth, a boiler support, a boiler barrel, a centralized ascending pipe, an energy saver, a soot blower and a water heater, wherein the boiler barrel is arranged on the boiler support, two sides of the boiler barrel are respectively connected with the centralized descending pipe and the centralized ascending pipe, the centralized descending pipe is respectively connected with the evaporation pipe group and the light pipe membrane type wall, the centralized ascending pipe is respectively connected with the evaporation pipe group and the light pipe membrane type wall, one end of the hearth is connected with the evaporation pipe group, the other end of the hearth is connected with the energy saver through a first connecting flue, the energy saver is connected with the water heater through a second connecting flue, and the second connecting flue is also connected with the shock wave soot cleaner through the soot blower. The utility model discloses mainly used electric stove high temperature flue gas waste heat recovery utilizes.

Description

Electric furnace high-temperature flue gas waste heat steam boiler

The technical field is as follows:

the utility model belongs to the technical field of the boiler trade, specifically speaking especially relates to an electric stove high temperature flue gas exhaust heat steam boiler.

Background art:

in recent years, laws and regulations in energy utilization are continuously perfected in China, national standard requirements for energy conservation and emission reduction are more and more strict, a large amount of heat generated by an electric furnace in a smelting process is discharged along with flue gas, sensible heat of the flue gas accounts for about 20% of total energy consumption, sensible heat of the flue gas is recovered to meet the requirements of the current national standard for energy conservation and emission reduction, namely, a waste heat boiler is arranged at a flue gas outlet to fully recover waste heat resources of the flue gas of the electric furnace, and in the prior art, the waste heat of the flue gas of the electric furnace is not fully recovered, so that the waste of the resources is caused.

The invention content is as follows:

the to-be-solved technical problem of the utility model is to overcome the not enough of prior art, provide an electric stove high temperature flue gas exhaust heat steam boiler, it satisfies the requirement of the existing standard of country to energy saving and emission reduction, realization comprehensive utilization of resources, the purpose of energy saving that can be better, good social and economic benefits have.

In order to achieve the above purpose, the utility model is realized by adopting the following technical scheme:

a steam boiler using high-temperature flue gas waste heat of an electric furnace comprises an evaporation pipe group, a light pipe membrane type wall, a centralized descending pipe, a hearth, a boiler support, a boiler barrel, a centralized ascending pipe, an energy saver, a soot blower and a water heater, wherein the boiler barrel is installed on the boiler support, two sides of the boiler barrel are respectively connected with the centralized descending pipe and the centralized ascending pipe, the centralized descending pipe is respectively connected with the evaporation pipe group and the light pipe membrane type wall, the centralized ascending pipe is respectively connected with the evaporation pipe group and the light pipe membrane type wall, one end of the hearth is connected with the evaporation pipe group, the other end of the hearth is connected with the energy saver through a first connecting flue, the energy saver is connected with the water heater through a second connecting flue, and the second connecting flue is also connected with a shock wave soot cleaner through the soot blower.

Preferably, the evaporating tube group comprises a first evaporating tube group, a second evaporating tube group, a third evaporating tube group and a fourth evaporating tube group, the upper end and the lower end of the second evaporating tube group are respectively connected with the third evaporating tube group and the first evaporating tube group, and the upper end of the third evaporating tube group is connected with the fourth evaporating tube group.

Preferably, the convection heating surface of the first evaporation tube group is a coiled tube, and an anti-wear tile is arranged on the coiled tube.

Compared with the prior art, the beneficial effects of the utility model are that:

1. because the adhesion of the steelmaking smoke dust is strong, all-optical-pipe coiled pipes are adopted on the convection heat exchange surface of the boiler, so that the ash falling of the boiler is facilitated;

2. the convection heating surface of the first evaporation pipe group is of a coiled pipe structure, the heat exchange surface pipes of the two rows of coiled pipes in front are provided with anti-abrasion tiles, the first evaporation pipe group is a first-stage heating surface, all coiled pipe outlets of the first-stage heating surface are inclined upwards by 10 degrees, and the first evaporation pipe group is of a vapor-resistance-preventing structure;

3. the energy saver is arranged on the second return stroke, in order to prevent dust accumulation of the energy saver, the energy saver adopts a light pipe energy saver, countercurrent heat exchange is carried out, the energy saver is formed by sealing an inner steel plate and adding aluminum silicate cellucotton, sealing is tight, and the energy saver is safe and durable;

4. the last stage is provided with a water heater, in order to adapt to the condition of low tail exhaust gas temperature, the water heater adopts light pipe ND steel, and under the premise of improving the corrosion resistance of a tail heating surface, the dust deposition state is greatly reduced by matching with a shock wave ash remover.

Description of the drawings:

fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural view of a first evaporating tube set in the present invention;

fig. 3 is a cross-sectional view a-a of fig. 2.

In the figure: 1. a first evaporating tube group; 2. a light pipe membrane wall; 3. a centralized downcomer; 4. a second evaporating tube group; 5. a rigid beam and a sway stopping device; 6. a third evaporating tube group; 7. a fourth evaporating tube group; 8. a hearth; 9. a boiler support; 10. a drum; 12. collecting an ascending pipe; 13. a first connecting flue; 14. an energy saver; 15. a soot blower; 16. a water heater; 17. a shock wave ash remover; 18. a second connecting flue; 19. a serpentine tube; 20. wear-resistant tiles; 21. and (4) clamping the board.

The specific implementation mode is as follows:

the present invention will be further described with reference to the following specific embodiments and accompanying drawings.

Example 1:

as shown in fig. 1, the electric furnace high-temperature flue gas waste heat steam boiler comprises an evaporation tube group, a light pipe membrane wall 2, a centralized downcomer 3, a hearth 8, a boiler support 9, a boiler barrel 10, a centralized riser 12, an economizer 14, a soot blower 15 and a water heater 16, wherein the boiler barrel 10 is installed on the boiler support 9, namely the boiler support 9 supports the boiler barrel 10, two sides of the boiler barrel 10 are respectively connected with the centralized downcomer 3 and the centralized riser 12, the construction is simple, the field installation workload is small, and the quality is easy to ensure; the centralized downcomer 3 is respectively connected with the evaporating pipe group and the light pipe membrane wall 2, the centralized riser 12 is respectively connected with the evaporating pipe group and the light pipe membrane wall 2, one end of the hearth 8 is connected with the evaporating pipe group, the other end is connected with the energy saver 14 through the first connecting flue 13, the energy saver 14 is connected with the water heater 16 through the second connecting flue 18, the second connecting flue 18 is further connected with the shock wave ash cleaner 17 through the ash blowing device 15, the hearth 8 is a novel membrane wall full light pipe, the whole water circulation is an inverted U-shaped single boiler natural circulation, the flue type structure is arranged, the boiler adopts an integral suspension structure, and the whole downward expansion is realized. The utility model is a full-film type wall furnace hearth, a fire-resistant material is arranged at the smoke box at the inlet of the boiler and the ash falling port at the lower part, and aluminum silicate fiber cotton is additionally arranged on both sides of the heat exchange surface of the boiler for the film type wall.

The energy saver 14 is arranged on the second return stroke, in order to prevent the energy saver 14 from accumulating dust, the energy saver 14 adopts a light pipe energy saver, countercurrent heat exchange is carried out, the energy saver 14 is in a boiling type and is led into the boiler barrel 10 through a pipe, a coiled pipe of the energy saver 14 is suspended on a steel frame through a support frame, and a peripheral flue is sealed by a steel plate.

The final stage is provided with a water heater 16, the heating capacity is 25t/h, in order to adapt to the condition of low tail exhaust gas temperature, the water heater 16 adopts a light pipe ND steel, and the dust deposition state is greatly reduced by matching with a shock wave ash cleaner 17 on the premise of improving the corrosion resistance of a tail heating surface.

Example 2:

the utility model provides an electric stove high temperature flue gas waste heat steam boiler, the evaporating pipe group includes first evaporating pipe group 1, second evaporating pipe group 4, third evaporating pipe group 6 and fourth evaporating pipe group 7, the upper and lower both ends of second evaporating pipe group 4 are connected with third evaporating pipe group 6 and first evaporating pipe group 1 respectively, and the upper end of third evaporating pipe group 6 is connected with fourth evaporating pipe group 7 again.

As shown in fig. 2, the convection heating surface of the first evaporation tube group 1 is a serpentine tube structure, the heat exchange surface tubes of the two rows of serpentine tubes 19 in front are provided with anti-wear shoes 20, as shown in fig. 3, the clamping plate 21 and the anti-wear shoes 20 form a circle together, the serpentine tubes 19 are installed between the clamping plate 21 and the anti-wear shoes 20, the first evaporation tube group 1 is a first-stage heating surface, outlets of all the serpentine tubes 19 of the first-stage heating surface are inclined upwards by 10 °, and the first evaporation tube group is a vapor resistance structure, that is, an angle between an outlet of the serpentine tube 19 and a horizontal plane is 10 °.

Because the convection heating surface is of a coiled pipe structure, the convection heating surface is limited by the transportation size, a piece delivery mode is adopted, the convection heating surface is assembled and butted on site, and because the electric furnace is frequently operated and fluctuated and the possibility of instantaneous overtemperature is high, the first-stage heating surface adopts a vapor-resistance-preventing structure, and the vapor resistance risk can be effectively reduced. The periphery of the coiled pipe 19 is of a large-scale membrane wall structure, so that the coiled pipe 19 is used as a support, and the overall sealing performance of the boiler is guaranteed.

Light pipe diaphragm type wall 2 passes through the rigid beam and ends and shake 5 fixed connection of device, the utility model discloses a single drum natural circulation of type of falling U, for full membrane type wall furnace, flue formula structural arrangement, the boiler adopts whole suspended structure. The other portions are the same as in example 1.

The utility model discloses install at the settling chamber top, cause the settling chamber after the electric stove high temperature flue gas preheats the scrap steel, then the flue gas gets into from the boiler bottom, the flue gas flow direction is fluorescent tube diaphragm type wall 2 in proper order, first evaporating pipe group 1, second evaporating pipe group 4, third evaporating pipe group 6, fourth evaporating pipe group 7, first connecting flue 13, energy-saving appliance 14, cooling to below 200 ℃ after the 16 heat transfer of water heater, get into the dust removal sweetener of afterbody at last, send into the chimney by the draught fan at last and emit into the atmosphere. The feed water enters the water heater 16 through the feed pump, the water enters the economizer 14 after being heated by the water heater 16, and then the water enters the drum 10 from the outlet header after being heated by the economizer 14; the water in the drum 10 flows through the collecting downcomer 3 into the evaporator tube bank and the light pipe membrane wall 2, where the heated steam-water mixture is reintroduced into the drum 10, and saturated steam at a desired pressure is then drawn from the drum 10.

Claims (3)

1. The utility model provides an electric stove high temperature flue gas waste heat steam boiler which characterized in that: comprises an evaporating pipe group, a light pipe membrane type wall (2), a centralized downcomer (3), a hearth (8), a boiler support (9), a boiler barrel (10), a centralized riser (12), an economizer (14), a soot blower (15) and a water heater (16), the boiler barrel (10) is installed on a boiler support (9), two sides of the boiler barrel (10) are respectively connected with a centralized downcomer (3) and a centralized riser (12), the centralized downcomer (3) is respectively connected with an evaporating tube group and a light tube membrane type wall (2), the centralized riser (12) is respectively connected with the evaporating tube group and the light tube membrane type wall (2), one end of a hearth (8) is connected with the evaporating tube group, the other end of the hearth is connected with an energy saver (14) through a first connecting flue (13), the energy saver (14) is connected with a water heater (16) through a second connecting flue (18), and the second connecting flue (18) is further connected with a shock wave ash cleaner (17) through a soot blower (15).

2. The electric furnace high-temperature flue gas waste heat steam boiler according to claim 1, characterized in that: the evaporating pipe group comprises a first evaporating pipe group (1), a second evaporating pipe group (4), a third evaporating pipe group (6) and a fourth evaporating pipe group (7), wherein the upper end and the lower end of the second evaporating pipe group (4) are respectively connected with the third evaporating pipe group (6) and the first evaporating pipe group (1), and the upper end of the third evaporating pipe group (6) is connected with the fourth evaporating pipe group (7).

3. The electric furnace high-temperature flue gas waste heat steam boiler according to claim 2, characterized in that: the convection heating surface of the first evaporation tube group (1) is a coiled tube (19), and an anti-abrasion tile (20) is arranged on the coiled tube (19).

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