A sintering mixture steam preheating device

Abstract

The utility model discloses a kind of sintering mixture steam preheating device, belong to steel smelting sintering technical field, including steam main pipe, the bunker connected with steam main pipe and the pipeline system being set between the two, pipeline system includes the filter in proper order Water purifier, into warehouse ring pipe and steam inlet pipe;Filter is connected on steam main pipe, filter includes the multiple folding direction wave board group for the steam entering bunker is separated into steam-water;The lower part of filter is equipped with drain pipeline, the outlet of filter is communicated with the into warehouse ring pipe around the bottom short section of bunker arrangement, into warehouse ring pipe is connected steam inlet pipe, one end of steam inlet pipe is communicated with into warehouse ring pipe, the other end is penetrated into the bottom short section of bunker and towards bunker center, the injection direction of steam inlet pipe is upwardly inclined, steam inlet pipe and the bottom short section of bunker form inclination angle.The utility model solves the problem that the existing sintering mixture preheating device generally exists steam water carrying, uneven heating, high energy consumption and maintenance complex.

Description

Technical Field

[0001] This utility model belongs to the field of iron and steel smelting and sintering technology, and particularly relates to a steam preheating device for sintering mixtures. Background Technology

[0002] During the sintering process, the temperature of the sintering mixture is a crucial factor restricting production. When the temperature of the sintering mixture is higher than the dew point temperature (which is generally 60-65℃ during the sintering process), the excessive moisture caused by water vapor condensation at the bottom of the material layer can be significantly reduced, effectively reducing the thickness of the excessively wet layer during the sintering process and improving the permeability of the material layer.

[0003] To increase the temperature of the mixture, an effective method is to use a steam preheating device for the mixing silo. Currently, there are generally two methods: one is perimeter preheating, where a main pipe is arranged around the lower part of the mixing silo, and a certain number of steam branch pipes are evenly distributed on the main pipe to preheat the sintered mixture inside the silo; the other is suspended preheating inside the silo, where a suspended steam preheater is installed inside the mixing silo. A suspension frame is installed on the upper part of the silo, located at one-quarter of the length of the upper opening of the mixing silo on both sides. Two preheaters are suspended on the suspension frame. The main body of the preheater is a cylindrical steel cylinder, with circular tubular steam injection ports welded around the cylinder. Steam enters the mixture through the injection ports to preheat the mixture.

[0004] Both of the aforementioned preheating methods involve direct connection between branch pipes and main pipes, a design flaw lacking effective drainage. Water accumulates in the pipes and cannot be discharged, causing condensate to flow into the mixture and increasing localized moisture content. Furthermore, due to the large upper space in the mixing silo, steam cannot penetrate all material columns in either of these preheating methods, resulting in uneven temperature distribution in the mixture. Additionally, steam easily overflows from the top of the silo, leading to waste. When the mixture is distributed onto the sintering trolley via the material distribution system, the uneven moisture and temperature significantly impact the permeability and heat distribution during sintering, severely affecting the quality of the sinter and increasing energy consumption in the production process.

[0005] Existing technologies have conducted extensive research on process control, but the negative impacts of steam preheating on the moisture content and temperature of the mixture have not yet been effectively controlled; suspended steam preheaters in the silo are prone to detachment or cause material to be suspended in the silo, leading to accidents. Utility Model Content

[0006] The purpose of this utility model is to provide a steam preheating device for sintered mixtures to solve the problems of steam carrying water, uneven heating, high energy consumption and complicated maintenance that are commonly found in existing sintered mixture preheating devices mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: A steam preheating device for sintering mixtures includes a steam main pipe for conveying steam, a silo connected to the steam main pipe, and a piping system disposed between the two. The piping system includes a water filter, an inlet ring pipe, and several steam inlet pipes connected in sequence. The water filter is connected in series to the steam main pipe and includes a multi-directional corrugated plate assembly for separating steam and water entering the silo. A drainage pipe is provided at the lower part of the water filter, and the outlet of the water filter is connected to the inlet ring pipe arranged around the bottom section of the silo. Several steam inlet pipes are uniformly connected to the inlet ring pipe. One end of each steam inlet pipe is connected to the inlet ring pipe, and the other end passes through the bottom section of the silo and faces the center of the silo. The jet direction of the steam inlet pipe is inclined upward relative to the horizontal plane, and the steam inlet pipe and the bottom section of the silo form an inclined angle to promote steam penetration of the mixture and facilitate the return of condensate.

[0008] Preferably, the bottom of the inlet ring pipe is provided with a drain valve, which is connected to the drain pipe of the water filter through a drain pipe.

[0009] Preferably, the drainage pipe is connected to a reuse pipeline.

[0010] Preferably, a plurality of steam inlet pipes are welded to the shortest side of the inner ring of the inlet ring pipe.

[0011] Preferably, the injection elevation angle of each steam inlet pipe is 10° to 20°, and the angle between the steam inlet pipe and the axis of the bottom short section of the silo is 70° to 80°.

[0012] Preferably, the steam inlet pipe is a seamless steel pipe with a diameter of DN25mm, and the center-to-center distance between adjacent steam inlet pipes is 250mm.

[0013] Preferably, the multi-fold corrugated plate group is composed of multiple sets of bent corrugated plates made of stainless steel. The bent corrugated plates adopt a multi-fold structure, and each corrugated plate is arranged in parallel along the longitudinal direction of the steam flow.

[0014] Preferably, the lateral spacing between adjacent bent corrugated plates is 15mm, and the vertical height of a single corrugated plate is 200mm.

[0015] Preferably, the outer surfaces of the water filter and the inlet ring pipe are covered with an insulation layer to reduce heat loss.

[0016] Preferably, the inner surface of the walls of the water filter, the inlet ring pipe, and the steam inlet pipe is provided with an anti-scaling coating.

[0017] Compared with the prior art, the beneficial effects of this utility model are: This invention relates to a steam preheating device for sintered mixtures, which offers significant technical advantages and practical benefits compared to existing technologies. It solves the common problems of steam carrying water, uneven heating, high energy consumption, and complex maintenance in existing sintered mixture preheating devices. By connecting a water filter in series with the main steam pipe and incorporating a multi-folded corrugated plate assembly inside the filter, steam-water separation is achieved before the steam enters the silo. This corrugated plate assembly, composed of stainless steel bent corrugated plates, effectively captures mist droplets and condensate through multiple folds and collisions, thereby significantly improving the dryness of the steam and preventing condensate from directly entering the mixture layer and causing localized increases in moisture content.

[0018] The dried steam, separated by the water filter, enters the inlet ring pipe through the filter outlet. This ring pipe is arranged around the outside of the bottom short section of the silo, with several steam inlet pipes evenly welded to the shortest side of its inner ring. The center-to-center spacing of the steam inlet pipes is 250 mm. Steam is injected upwards into the sintering mixture pile through the steam inlet pipes at an elevation angle of 10°–20° and an angle of 70°–80° relative to the axis of the bottom short section, achieving a multi-point penetration heating method from the bottom of the material layer. This arrangement significantly improves the penetration of steam in the mixture pile, ensuring uniform heating from bottom to top, thus effectively eliminating the problem of uneven temperature distribution in traditional silo wall heating or suspended nozzle methods.

[0019] Due to the inclined arrangement between the steam inlet pipe and the bottom short section, condensate can flow back to the inlet ring pipe under gravity along the direction of the steam inlet pipe. The drain valve at the bottom of the inlet ring pipe is connected to the drain pipe of the water filter, and the condensate flows into the same main drain pipe. It then enters the sintering production system for reuse through the condensate recycling pipeline, realizing automatic condensate recovery and energy recycling. This structure not only ensures that there is no water accumulation in the material layer, but also improves steam utilization and energy efficiency.

[0020] The device of this invention, through the above-described structural combination, ensures that the steam has a high degree of dryness before entering the silo, resulting in uniform distribution, strong penetration, and significant preheating effect. In actual production, the temperature difference across all points of the sintered mixture after preheating by this device is less than 3°C, and the moisture difference is less than 0.3 percentage points, significantly improving the uniformity and permeability of the mixture.

[0021] In addition, the outer surfaces of the water filter, inlet ring pipe, and steam inlet pipe are covered with an insulation layer, and the inner surfaces of the pipe walls are coated with an anti-scaling or anti-corrosion coating, which can reduce heat loss and scaling corrosion, ensuring long-term stable operation of the equipment. The entire system is compact in structure, reliable in operation, and easy to maintain. It not only achieves efficient preheating of the sintering mixture, but also realizes the recycling and reuse of condensate, resulting in comprehensive benefits of energy saving, consumption reduction, and environmental friendliness. Attached Figure Description

[0022] Figure 1This is a schematic diagram of a preferred embodiment of the present invention; Figure 2 This is a schematic cross-sectional view of the inlet ring pipe in a preferred embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the multi-folded waveform plate group in a preferred embodiment of the present invention.

[0023] In the diagram: 1. Steam main pipe; 2. Steam main valve; 3. Pressure gauge; 4. Multi-directional corrugated plate assembly; 5. Water filter; 6. Steam inlet pipe; 7. Inlet ring pipe; 8. Sintering mixture silo; 9. Sintering mixture column; 10. Bottom section of silo; 11. Drain valve; 12. Reuse pipeline. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0025] like Figures 1-3 As shown: This embodiment of a sintering mixture steam preheating device includes a steam main pipe 1 for conveying steam, a silo connected to the steam main pipe 1, and a pipeline system disposed between the two. The pipeline system includes, in sequence, a water filter 5, a silo inlet ring pipe 7, and several steam inlet pipes 6.

[0026] The steam main pipe 1 is used to introduce saturated steam from the boiler or steam manifold into this device; the water filter 5 is installed in series at the end of the steam main pipe 1 to separate steam and water before the steam enters the silo; the outlet of the water filter 5 is connected to the inlet ring pipe 7 through a connecting flange, and the inlet ring pipe 7 is arranged around the periphery of the bottom short section 10 of the silo to evenly distribute the dry steam to the bottom of the silo.

[0027] The water filter 5 has a cylindrical shell structure, and its shell has an air inlet chamber, an air-water separation chamber and a drain chamber arranged from top to bottom.

[0028] The water filter 5 contains a set of multi-folded corrugated plates 4 for steam-water separation.

[0029] The multi-fold corrugated plate assembly 4 is composed of multiple sets of bent corrugated plates made of stainless steel. The bent corrugated plates adopt a multi-fold structure to change the steam flow direction, reduce the flow velocity, and enhance the effects of inertial collision and centrifugal separation. Adjacent corrugated plates are arranged parallel to each other in the longitudinal direction of the steam flow, with a lateral spacing of 15 mm and a vertical height of 200 mm for each individual corrugated plate.

[0030] When steam carrying mist enters water filter 5, the airflow deflects multiple times between the corrugated plates, removing droplets through collision, condensation, and gravity settling. The separated dry steam exits from the upper outlet of water filter 5, while the condensate collects in the drain chamber at the bottom of water filter 5.

[0031] The lower part of the water filter 5 is equipped with a drain pipe, which is connected to the plant's condensate recycling system via a pipeline to discharge and recycle the separated condensate. The outer surface of the water filter 5 shell is covered with an insulation layer to reduce heat loss and prevent surface condensation. The insulation layer is made of aluminum silicate fiber felt or rock wool, with a thickness of 20-40 mm.

[0032] The outlet of the water filter 5 is connected to the inlet ring pipe 7. The vertical cross-section of the inlet ring pipe 7 is polygonal and the whole is arranged in a circular shape. The inlet ring pipe 7 is made of thick-walled seamless steel pipe and is arranged circumferentially along the outside of the bottom short section 10 of the silo. It is used to distribute the steam after steam-water separation along the circumference of the bottom of the silo.

[0033] In this embodiment, a plurality of steam inlet pipes 6 are welded to the shortest side of the inner ring of the inlet ring pipe 7. One end of each steam inlet pipe 6 is connected to the inlet ring pipe 7, and the other end is inserted into the bottom short section 10 of the silo and faces the center of the silo, so that steam enters each steam inlet pipe 6 from the inlet ring pipe 7.

[0034] The bottom of the inlet ring pipe 7 is equipped with a drain valve 11, which is connected to the drain pipe located at the bottom of the water filter 5. The two share a common drain pipe, forming a complete condensate discharge channel. The discharged condensate is reused in the sintering production process through the recycling pipe 12, realizing energy recovery and recycling.

[0035] The steam inlet pipe 6 is made of seamless steel pipe with a diameter of DN25mm. The center-to-center distance between adjacent steam inlet pipes 6 is 250 mm to ensure uniform distribution of steam at the bottom of the silo.

[0036] The steam inlet pipe 6 is positioned at an elevation angle of 10° to 20° relative to the horizontal plane, preferably 15°; the angle between the steam inlet pipe 6 and the axis of the bottom section 10 of the silo is 70° to 80°, preferably 75°. This angular arrangement allows steam to penetrate the sintered mixture from bottom to top along an inclined direction, diffusing upwards from the bottom region to preheat the sintered mixture. Simultaneously, the angle also allows condensate to flow back into the inlet ring pipe 7 along the direction of the steam inlet pipe 6 under gravity, thus preventing condensate from remaining in the sintered mixture.

[0037] The bottom of the inlet ring pipe 7 is equipped with a drainage pipe, which is connected to the reuse pipe 12 to collect the returned condensate into the plant's reuse system. The outer surface of the inlet ring pipe 7 is also covered with an insulation layer to prevent heat loss. The insulation layer is made of aluminum silicate fiber felt or rock wool, with a thickness of 20-40 mm.

[0038] The inner surfaces of the inlet ring pipe 7 and the steam inlet pipe 6 are provided with anti-scaling or anti-corrosion coatings, such as fluoroplastic coatings or high-temperature resistant anti-corrosion paint layers, to reduce scaling and corrosion during long-term operation.

[0039] Working principle: Before the unit is put into operation, open the main steam valve 2 and connect the main steam pipe 1 to the boiler or steam manifold to introduce saturated steam with a pressure of not less than 0.3 MPa and a temperature of not less than 150℃ into the system.

[0040] Before the steam enters the water filter 5, the steam pressure is monitored in real time by the pressure gauge 3 set on the main pipe to ensure stable preheating conditions.

[0041] Steam first enters the water filter 5. The water filter is equipped with a multi-fold corrugated plate assembly 4, which consists of multiple sets of stainless steel bent corrugated plates. The corrugated plates are arranged in parallel longitudinally, with a lateral spacing of about 15 mm and a vertical height of 200 mm.

[0042] When steam carrying condensate droplets passes through the gaps in the corrugated plates, the airflow changes direction multiple times. Under the action of inertial and centrifugal forces, the droplets are captured, condensed, and sink by the surface of the corrugated plates. The separated condensate collects at the bottom of the water filter under gravity, flows through the drain outlet at the bottom of the water filter and into the reuse pipeline 12 via the drain valve 11, and is finally returned to the steam or hot water system of the sintering production line for reuse.

[0043] The separated dry steam is discharged from the upper outlet of the water filter and enters the inlet ring pipe 7.

[0044] The water filter outlet is connected to the inlet ring pipe 7. The vertical cross-section of the inlet ring pipe is polygonal, and the whole is circular. It is arranged along the outer periphery of the bottom short section 10 of the sintering mixture bin 8 to distribute the drying steam evenly in the circumferential direction.

[0045] Several steam inlet pipes 6 are welded to the shortest side of the inner ring of the silo inlet pipe. These steam inlet pipes 6 are made of DN25mm seamless steel pipes, and the center-to-center distance between adjacent steam inlet pipes 6 is 250 mm. One end of each steam inlet pipe 6 is connected to the silo inlet ring pipe, and the other end passes through the bottom short section 10 of the silo and points to the center of the sintering mixture silo 8.

[0046] The steam inlet pipe 6 is arranged at an elevation angle of 10° to 20° relative to the horizontal plane, forming an angle of 70° to 80° with the axis of the bottom short section. Through this inclined arrangement, the steam jet can penetrate the sintering mixture column 9 from bottom to top, and under the action of gravity, the condensate can flow back into the inlet ring pipe 7, thereby preventing the local moisture content of the mixture from rising.

[0047] The dried steam, after steam-water separation, is evenly distributed from the inlet ring pipe 7 into each steam inlet pipe 6, and injected upwards at an elevation angle into the bottom short section 10 area of ​​the sintering mixture silo 8. The steam rises in the gaps of the material pile, making full contact with the solid particles in the sintering mixture column 9, thus completing heat transfer. The mixture is heated layer by layer from bottom to top, achieving uniform preheating.

[0048] During the heating process, some of the steam condenses into condensate. Under the action of gravity, the condensate flows back along the inner wall of the steam inlet pipe 6 to the inlet ring pipe 7, and then is discharged through the drain valve 11 at the bottom. It merges with the drain pipe of the water filter 5 and enters the reuse pipe 12, and finally flows back to the sintering production system for reuse.

[0049] The pressure gauge 3 on the steam main pipe 1 continuously monitors the system pressure. When the pressure deviates from the set value, the steam flow rate entering the water filter 5 can be controlled by adjusting the steam main valve 2 to maintain a stable preheating temperature.

[0050] During the above cycle, the water filter 5 ensures that the steam entering the silo is in a high dryness state, and the silo inlet ring pipe 7 and the evenly distributed steam inlet pipe 6 realize the circumferential multi-point injection of steam, so that the steam penetrates evenly in the mixed material column 9.

[0051] Tests showed that after using this device to preheat the mixture in sintering mixing bin 8, the temperature difference between the transverse measuring points of the material pile was less than 3°C, and the moisture difference was less than 0.3 percentage points, which is a significant improvement over the traditional steam preheating method. At the same time, it realizes the recycling and reuse of condensate, improving the thermal energy utilization rate and system stability.

[0052] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A steam preheating device for sintered mixtures, comprising a steam main pipe (1) for conveying steam, a silo connected to the steam main pipe (1), and a piping system disposed between the two, characterized in that: The pipeline system includes a water filter (5), an inlet ring pipe (7), and several steam inlet pipes (6) connected in sequence. The water filter (5) is connected in series to the main steam pipe (1). The water filter (5) includes a multi-folded corrugated plate group (4) for separating steam and water entering the silo. The lower part of the water filter (5) is provided with a drainage pipe. The outlet of the water filter (5) is connected to the inlet ring pipe (7) arranged around the bottom section (10) of the silo. Several steam inlet pipes (6) are evenly connected to the inlet ring pipe (7). One end of each steam inlet pipe (6) is connected to the inlet ring pipe (7), and the other end passes through the bottom section (10) of the silo and faces the center of the silo. The jet direction of the steam inlet pipe (6) is inclined upward relative to the horizontal plane. The steam inlet pipe (6) and the bottom section (10) of the silo form an inclined angle to promote the penetration of steam through the mixture and facilitate the return of condensate.

2. The steam preheating device for sintered mixtures according to claim 1, characterized in that, The bottom of the inlet ring pipe (7) is provided with a drain valve (11), which is connected to the drain pipe of the water filter (5) through a drain pipe.

3. The steam preheating device for sintered mixtures according to claim 1 or 2, characterized in that, The drainage pipe is connected to the reuse pipe (12).

4. The steam preheating device for sintered mixtures according to claim 1, characterized in that, Several steam inlet pipes (6) are welded to the shortest side of the inner ring of the inlet ring pipe (7).

5. The steam preheating device for sintered mixtures according to claim 1, characterized in that, The jet elevation angle of each steam inlet pipe (6) is 10° to 20°, and the angle between the steam inlet pipe (6) and the axis of the bottom short section (10) of the silo is 70° to 80°.

6. The steam preheating device for sintered mixtures according to claim 1, characterized in that, The steam inlet pipe (6) is a seamless steel pipe with a diameter of DN25mm, and the center-to-center distance between adjacent steam inlet pipes (6) is 250 mm.

7. The steam preheating device for sintered mixtures according to claim 1, characterized in that, The multi-fold corrugated plate group (4) is composed of multiple sets of stainless steel bent corrugated plates. The bent corrugated plates adopt a multi-fold structure, and each corrugated plate is arranged in parallel along the steam flow direction.

8. The steam preheating device for sintered mixtures according to claim 7, characterized in that, The lateral spacing between adjacent bent corrugated plates is 15mm, and the vertical height of a single corrugated plate is 200mm.

9. The steam preheating device for sintered mixtures according to claim 1, characterized in that, The outer surfaces of the water filter (5) and the inlet ring pipe (7) are covered with an insulation layer to reduce heat loss.

10. The steam preheating device for sintered mixtures according to claim 1, characterized in that, The inner surfaces of the walls of the water filter (5), the inlet ring pipe (7), and the steam inlet pipe (6) are provided with anti-scaling coatings.

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