CN211394525U - Novel reforming furnace for producing reducing gas - Google Patents
Novel reforming furnace for producing reducing gas Download PDFInfo
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- CN211394525U CN211394525U CN201921674059.3U CN201921674059U CN211394525U CN 211394525 U CN211394525 U CN 211394525U CN 201921674059 U CN201921674059 U CN 201921674059U CN 211394525 U CN211394525 U CN 211394525U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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Abstract
The utility model provides a novel reforming furnace for producing reducing gas, which belongs to the technical field of metallurgy and petrochemical industry. The reforming furnace comprises a radiation chamber with a lining, a reforming furnace tube, a reforming gas inlet and outlet pipe system, a transition section, a convection section and a smoke and air system. The reforming furnace tubes adopt large caliber to reduce the number of the furnace tubes and reduce the investment; the reformed gas inlet pipe is connected with the reforming furnace pipe by adopting a flexible pipe, so that the axial and radial thermal displacement of the furnace pipe can be conveniently absorbed, and the thermal stress of the furnace pipe system is reduced; the elastic support is arranged at the bottom of the reforming furnace tube, so that the weight of the furnace tube is partially borne, and the recovery of the furnace tube after thermal expansion under the parking working condition is facilitated; the inclined tee joint at the top of the radiant chamber furnace replaces the traditional hot wall pipe, a short tail box is omitted, materials are saved, and investment is reduced; high-temperature flue gas is introduced to the transition section from multiple channels at the upper parts of two sides of the radiation chamber, then enters the convection section to preheat air, reform feed gas and fuel gas, and high-quality steam is produced, thereby reducing heat loss of flue gas and improving the thermal efficiency of the reforming furnace.
Description
The technical field is as follows:
the utility model belongs to the technical field of metallurgy and petrochemical industry, a novel reforming furnace for producing reducing gas is related to.
Background
The gas-based direct reduced iron has the characteristics of short flow, high efficiency and less impurities, and is a novel advanced metallurgical steelmaking mode different from the traditional blast furnace steelmaking. At present, no precedent exists in China for producing gas-based direct reduced iron.
The main problem of gas-based reduced iron is to solve the production of reducing gas, and the production of foreign reducing gas mainly adopts natural gas steam conversion or partial oxidation to produce synthesis gas. While the domestic natural gas resource is limited, the foreign synthesis gas production process is unlikely to be selected, and a novel device is needed to solve the technical and economic problems of raw materials and products in order to develop the domestic direct reduced iron industry.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a device for producing reducing gas of direct reduced iron aiming at the technical problems, and solves the technical and economic problems of the prior reducing gas for producing direct reduced iron.
The purpose of the utility model can be realized by the following technical scheme:
a new reforming furnace for producing reducing gas comprises a radiant chamber box body, a reforming furnace tube, a burner, a transition section and a convection section;
the reforming furnace tubes are vertically arranged in parallel in 2m rows in the radiation chamber box body, and penetrate through the bottom plate and the top plate of the radiation chamber box body; wherein, the reforming furnace tubes passing through the top plate of the box body of the radiation chamber are connected with the cold wall branch pipe through an inclined tee joint, two connected rows of reforming furnace tubes are connected to the same cold wall branch pipe, and the end parts of the cold wall branch pipes are converged into a cold wall main pipe;
reforming raw material gas inlet branch main pipes are arranged below the radiation chamber box body, one row of reforming raw material gas inlet branch main pipes correspond to one reforming raw material gas inlet branch main pipe, branches with the same number as that of each row of reforming raw material gas inlet branch main pipes are arranged on each reforming raw material gas inlet branch main pipe, and the reforming raw material gas inlet branch main pipes are connected with the reforming raw material gas inlet branch main pipes through flexible pipes;
the burners are distributed in (2m +1) and arranged on the bottom wall plate below the radiation chamber, and are staggered with the reforming furnace tubes in rows;
the transition section is characterized in that a plurality of transition section branch pipes are arranged above two side wall plates of the radiation chamber box body and led out to a transition section branch main pipe, and the two transition section branch main pipes are converged into a transition section main pipe at one end of the radiation chamber box body; the transition section header pipe is connected with the convection section, and the convection section is connected with the chimney through the induced draft fan;
wherein: m is a natural number more than or equal to 1.
The utility model discloses among the technical scheme: the lower end of the reforming furnace tube penetrating through the bottom plate of the radiation chamber is provided with a furnace tube elastic support.
The utility model discloses among the technical scheme: the flexible pipe is respectively connected with the reforming furnace tube and the reforming feed gas inlet branch pipe through flanges.
The utility model discloses among the technical scheme: the top and the bottom of the reforming furnace tube are both provided with detachable flanges.
The utility model discloses among the technical scheme: an explosion vent is arranged on the radiation chamber box body, and a safety baffle is arranged near the explosion vent.
The utility model discloses among the technical scheme: the convection section is arranged in an L shape or in a horizontal or vertical way.
In some preferred embodiments: the convection section consists of more than or equal to 4 heat exchangers, and the heat exchangers are at least 4 of a flash evaporator, a reforming raw material preheater, a steam superheater, a desulfurization coke oven gas preheater, a top gas preheater and a combustion air preheater.
The utility model discloses among the technical scheme: the inner diameter of the reforming furnace tube is more than or equal to 200 mm.
In some preferred embodiments: m is 3.
The beneficial effects of the utility model are that
1) The bottom burning type furnace type has the advantages that the cold wall pipe is arranged above the radiation chamber, the arrangement is attractive only by following the process flow, the path of a reformed gas product entering the downstream shaft furnace is shortened, the length of the cold wall main pipe is not lower than the height of the radiation chamber compared with a top burning furnace type, the metal and lining materials of the cold wall pipe are saved, and the investment of the cold wall pipe is reduced by about 21%. In addition, the floor area of the cold wall pipe is reduced, and the floor area is saved by about 38% of the radiation chamber.
2) The arrangement of the inclined tee joint at the top of the radiant chamber furnace replaces the traditional hot wall pipe, the arrangement of a short tail box is cancelled, the transition from the hot wall pipe to the cold wall pipe is well completed, the material is saved, and the investment is reduced.
3) The reforming furnace tube adopts a centrifugal casting tube with a larger caliber (the inner diameter is more than or equal to 200mm), and when the reforming gas pressure is lower and the volume is larger, the reforming conversion tube with a large caliber is adopted, so that the number of the furnace tubes can be greatly reduced, the investment cost of the furnace tubes can be reduced by not less than 16% compared with the traditional furnace tubes with the inner diameter of 100mm, the occupied area of the radiation chamber is saved by not less than 25%, and the investment of a box body of the radiation chamber is reduced.
4) The elastic support is arranged at the lower part of the reforming furnace tube, so that the elastic support bears part of the weight of the reforming furnace tube, reduces the load of the furnace tube on the furnace top, and is favorable for the recovery of the furnace tube after thermal expansion under the stop working condition.
5) The furnace type reforming furnace tube has downward thermal expansion, and the arrangement of the flexible tube is favorable for absorbing the axial and radial thermal displacement of the reforming furnace tube, thereby saving the space and improving the economy. And the two ends of the flexible pipe are provided with flanges for connection, so that the flexible pipe is convenient to detach and replace flexibly and flexibly.
6) A safety baffle is arranged near the outdoor explosion door of the radiation chamber, so that the safety of personnel on a nearby platform is guaranteed.
7) The multi-channel connection between the radiation chamber and the transition section is arranged in the positions and the number of the multi-channel connection, so that dead zones in a high-temperature flue gas flow field in the radiation chamber are avoided as much as possible, each reforming furnace tube in the radiation chamber is heated uniformly and reaches the reaction temperature of the catalyst.
8) The top and the bottom of the reforming furnace tube are both provided with detachable flanges, so that the filling and the discharging of the catalyst are convenient.
Drawings
FIG. 1 is a front view of a novel reformer according to embodiment 1 of the present invention;
FIG. 2 is a top view of a novel reformer according to embodiment 1 of the present invention;
FIG. 3 is a left side view of a novel reformer according to embodiment 1 of the present invention;
fig. 4 is a schematic structural view of a novel reforming furnace according to embodiment 1 of the present invention.
FIG. 5 is a front view of a novel reformer according to embodiment 2 of the present invention;
FIG. 6 is a top view of a novel reformer according to embodiment 2 of the present invention;
in the figure, 1, a combustion air duct, 2, a reforming raw material gas inlet branch main pipe, 3, a flexible pipe, 4, a furnace pipe elastic support, 5, a burner, 6, a reforming furnace pipe, 7, a radiation chamber heat insulation lining, 8, a radiation chamber box body, 9, a fire observation door, 10, a safety baffle, 11, an explosion door, 12, a transition section branch main pipe, 13, a transition section branch pipe, 14, an inclined tee joint, 15, a cold wall branch pipe, 16, a cold wall main pipe, 17, a transition section main pipe, 18, a rapid evaporator, 19, a reforming raw material preheater, 20, a convection connecting section, 21, a steam superheater, 22, a desulfurization coke oven gas preheater, 23, a furnace top gas preheater, 24, a combustion air preheater, 25, a flue, 26, a chimney, 27, an induced draft fan, 28, a front air preheater, 29, a blower and 30, an induced draft tower.
The specific implementation mode is as follows:
the present invention will be further explained with reference to the following embodiments, but the scope of the present invention is not limited thereto:
example 1
Figure 1 shows a front view of the new reformer of an embodiment of the utility model; figure 2 shows a top view of the novel reformer of one embodiment of the present invention; figure 3 shows a left side view of the novel reformer of one embodiment of the present invention; figure 4 shows a cross-sectional view a-a of the novel reformer of one embodiment of the present invention.
As shown in figures 1, 2, 3 and 4, the novel reforming furnace adopts a bottom-firing structure, reforming furnace tubes 6 (the inner diameter is more than or equal to 200mm) are vertically arranged inside a radiation chamber box body 8 and are specifically arranged into six parallel rows, the reforming furnace tubes 6 penetrate through a top plate of the radiation chamber 8 and are connected with cold wall branch tubes 15 through inclined tee joints 14, two adjacent rows of reforming furnace tubes are connected to one cold wall branch tube 15, three cold wall branch tubes are converged into a cold wall main tube 16 at the end part, a high-temperature reformed gas product at the temperature of 910 ℃ is sent to a shaft furnace for a lower-stage reaction, wherein the inclined tee joints and the cold wall branch (main) tubes are provided with heat-insulating linings, so that the temperature of a metal wall is greatly reduced, a low-alloy steel material with more economical piping can be selected, the investment is reduced, the thermal stress of the shaft furnace is.
Reforming raw material gas is led to the vicinity of the radiation chamber from an outlet of a reforming raw material preheater 19, six reforming raw material gas inlet branch main pipes 2 are arranged below a box body 8 of the radiation chamber, one row of furnace tubes corresponds to one reforming raw material gas inlet branch main pipe 2, branches with the same number as that of each row of furnace tubes are arranged on each reforming raw material gas inlet branch main pipe 2, and flanges are arranged at tail ends of the branches and connected with reforming furnace tubes 6 through flexible tubes 3. In the embodiment, the reforming furnace tubes expand downwards when heated, and because the catalyst in the reforming furnace needs to react in a high-temperature interval, the reforming furnace tubes have large displacement after being heated, if traditional pigtails are arranged to absorb thermal displacement, because the furnace gas passing through each reforming furnace tube has large volume, in order to meet the flow rate limitation, the diameter of the pigtail is large (DN is more than or equal to 65mm), if the same displacement needs to be absorbed, a long pigtail is needed, the required space is large, and the furnace top height of the radiation chamber is greatly increased. This department of this embodiment sets up flexible pipe 3, can not only absorb the axial displacement and the radial displacement of reforming furnace pipe better, has reduced the thermal stress influence of reforming furnace pipe to radiation chamber roof moreover, the space of still significantly reduced radiation chamber below has reduced the mounting height of radiation chamber, has increased the steadiness of reforming furnace, has improved economic nature.
And two ends of the flexible pipe 3 are provided with flange connections, so that flexible and soft disassembly and replacement are facilitated.
The lower end of the reforming furnace tube 6, which penetrates out of the bottom plate of the radiation chamber 8, is provided with the furnace tube elastic support 4, so that the weight of the reforming furnace tube and the catalyst is about 1/3, the load of the furnace tube on the top of the radiation chamber is reduced, and the recovery of the furnace tube after thermal expansion under the stop working condition is facilitated.
The top and the bottom of the reforming furnace tube 6 are both provided with detachable flanges, which is convenient for filling and discharging the catalyst.
The metal wall plate of the radiation chamber box body 8 is lined with a radiation chamber heat insulation material 7, and particularly a fire observation door 9 is reasonably arranged on the wall plate around the radiation chamber so as to observe the flame condition of a burner in the radiation chamber. Set up explosion vent 11 of reasonable quantity on the wallboard specifically according to the radiation room size, set up safety shield 10 near 11 explosion vents outside the radiation to prevent that the indoor high temperature flue gas of radiation from directly impacting near operating platform personnel on, give the staff a multiple safety guarantee.
The burners 5 are low NOx type burners, seven rows of burners are arranged at the bottom of the box body 8 of the radiation chamber in parallel with the reforming furnace tubes 6, and are arranged in rows and staggered with the reforming furnace tubes, the flame direction of the burners is upward, so that the double sides of the reforming furnace tubes are heated conveniently, and the low NOx type burners are adopted, thereby realizing the complete combustion in a low excess air coefficient state, reducing the generation of NOx and protecting the environment.
High-temperature flue gas generated by combustion in the box body 8 of the radiation chamber is led out from ten transition section branch pipes 13 above two side wall plates of the radiation chamber to a transition section branch main pipe 12, and the two branch main pipes 12 are converged into a transition section main pipe 17 at one end of the radiation chamber. The branch (dry) pipe of the transition section/the main pipe of the transition section are provided with heat insulation linings.
The convection section is arranged in an L shape (vertical and horizontal combined type), the flash evaporator 18 and the reforming raw material preheater 19 are arranged in a vertical section of the convection section 20, and the steam superheater 21, the desulfurized coke oven gas preheater 22, the top gas preheater 23 and the combustion air preheater 24 are arranged in a horizontal section of the convection section 20. The high temperature flue gas with 1200 ℃ at the outlet of the transition section recovers heat through the convection section, so that the temperature of the flue gas is reduced to be below 100 ℃, and the flue gas is discharged to a chimney 26 through a draught fan 27. The convection section 20 utilizes the high-temperature flue gas to heat air, top gas, coke oven gas and reforming feed gas, reduces the heat load of the radiation chamber by 20-30%, reduces the consumption of fuel gas, generates high-grade high-pressure superheated steam and generates benefits. The arrangement of the convection section 20 greatly reduces the heat loss of exhaust gas, further improves the heat efficiency of the reforming furnace, and the heat efficiency reaches more than 95 percent.
Example 2
Figure 5 shows a front view of the new reformer of embodiment 2 of the present invention; fig. 6 shows a top view of the novel reformer of embodiment 2 of the present invention.
Referring to fig. 5 and 6, the arrangement of the radiant chamber, cold wall pipe, inclined tee, reforming feed gas inlet piping and burner of the reforming furnace of this example is the same as that of example 1.
The two branch trunk pipes 12 of the transition section are directly connected to the inlet of the convection section 20, the convection section 20 is vertically arranged in a shape like a Chinese character '1', high-temperature flue gas at 1200 ℃ at the outlet of the transition section sequentially passes through a rapid evaporator 18, a reforming raw material preheater 19, a steam superheater 21, a desulfurization coke oven gas preheater 22, a furnace top gas preheater 23 and a combustion air preheater 24 from top to bottom, the heat of the flue gas is fully recovered by sequentially heating water, raw material gas, saturated steam, coke oven gas, furnace top gas and air through convection heat exchange, the temperature of the flue gas is reduced to be below 100 ℃, and the flue gas is discharged to a chimney 26 through an induced. The convection section adopts the vertical arrangement of the shape of the Chinese character '1', the structure is compact, and the floor area of the equipment is greatly saved.
It should be understood that the above-mentioned embodiments are only for illustrating the technical conception and the features of the present invention, and the purpose thereof is to provide those skilled in the art with an understanding of the content of the present invention and to implement the present invention, and the protection scope of the present invention is not limited thereby. All modifications and equivalents of the technical solutions according to the present invention may be made without departing from the spirit and scope of the technical solutions of the present invention, and the scope of the claims of the present invention is to be covered thereby.
Claims (9)
1. A novel reformer for producing reducing gas, characterized in that: the reforming furnace comprises a radiation chamber box body (8), a reforming furnace tube (6), a combustor (5), a transition section and a convection section;
the reforming furnace tubes (6) are vertically arranged in parallel in 2m rows in the radiation chamber box body (8), and the reforming furnace tubes (6) penetrate through the bottom plate and the top plate of the radiation chamber box body (8); wherein the reforming furnace tubes (6) penetrating through the top plate of the radiant chamber box body (8) are connected with the cold wall branch tubes (15) through inclined tee joints (14), two rows of connected reforming furnace tubes (6) are connected to the same cold wall branch tube (15), and the end parts of the cold wall branch tubes (15) are converged into cold wall main tubes (16);
reforming raw material gas inlet branch main pipes (2) are arranged below the radiation chamber box body (8), one row of reforming raw material gas inlet branch main pipes (2) correspond to one row of reforming raw material gas inlet branch main pipes (6), branches with the same number as that of each row of reforming raw material gas inlet branch main pipes (2) are arranged on each reforming raw material gas inlet branch main pipe (2), and the reforming raw material gas inlet branch main pipes (2) are connected with the reforming raw material gas inlet branch main pipes (6) through flexible pipes (3);
the burners are distributed in (2m +1) and arranged on the bottom wall plate below the radiation chamber, and are staggered with the reforming furnace tubes in rows;
the transition section is characterized in that a plurality of transition section branch pipes (13) are arranged above two side wall plates of the radiation chamber box body (8) and led out to a transition section branch main pipe (12), and the two transition section branch main pipes (12) are converged into a transition section main pipe (17) at one end of the radiation chamber box body (8); the transition section header pipe (17) is connected with the convection section, and the convection section is connected with a chimney (26) through an induced draft fan (27);
wherein: m is a natural number more than or equal to 1.
2. The new reformer for producing reducing gas according to claim 1, characterized in that: the lower end of the reforming furnace tube (6) which passes through the bottom plate of the radiation chamber is provided with a furnace tube elastic bracket (4).
3. The new reformer for producing reducing gas according to claim 1, characterized in that: the flexible pipe (3) is respectively connected with the reforming furnace pipe (6) and the reforming feed gas inlet branch main pipe (2) through flanges.
4. The new reformer for producing reducing gas according to claim 1, characterized in that: the top and the bottom of the reforming furnace tube (6) are both provided with detachable flanges.
5. The new reformer for producing reducing gas according to claim 1, characterized in that: an explosion door is arranged on the radiation chamber box body (8), and a safety baffle (10) is arranged near the explosion door (11).
6. The new reformer for producing reducing gas according to claim 1, characterized in that: the convection section is arranged in an L shape or in a horizontal or vertical way.
7. The new reformer for producing reducing gas according to claim 6, characterized in that: the convection section consists of more than or equal to 4 heat exchangers, and the heat exchangers are at least 4 of a flash evaporator, a reforming raw material preheater, a steam superheater, a desulfurization coke oven gas preheater, a top gas preheater and a combustion air preheater.
8. The new reformer for producing reducing gas according to claim 1, characterized in that: the inner diameter of the reforming furnace tube is more than or equal to 200 mm.
9. The new reformer for producing reducing gas according to claim 1, characterized in that: m is 3.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921674059.3U CN211394525U (en) | 2019-10-09 | 2019-10-09 | Novel reforming furnace for producing reducing gas |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921674059.3U CN211394525U (en) | 2019-10-09 | 2019-10-09 | Novel reforming furnace for producing reducing gas |
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| CN211394525U true CN211394525U (en) | 2020-09-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110578027A (en) * | 2019-10-09 | 2019-12-17 | 中石化南京工程有限公司 | novel reforming furnace for producing reducing gas |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110578027A (en) * | 2019-10-09 | 2019-12-17 | 中石化南京工程有限公司 | novel reforming furnace for producing reducing gas |
| CN110578027B (en) * | 2019-10-09 | 2024-04-30 | 中石化南京工程有限公司 | Novel reformer for producing reducing gas |
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