Treatment system for converter high-temperature vaporization flue boiler outlet gas

Abstract

The utility model belongs to the technical field of converter gas treatment, and relates to a treatment system for converter high-temperature vaporization flue boiler outlet gas, which comprises a heat and mass recovery device, a blind plate, a channel plate and an original first conveying pipeline for conveying gas into an original dust removal device of a converter system, the heat and mass recovery device comprises a second conveying pipeline, a dust remover, a third conveying pipeline and a tempering dust remover which are connected in sequence; the tempering dust remover is constructed to spray water to the coal gas for tempering and dust removal; an inlet of the second conveying pipeline is communicated with the first conveying pipeline; the third conveying pipeline is provided with at least one heat exchange pipe section arranged in the coal gas flowing direction. Between the first conveying pipeline and the second conveying pipeline, an internal channel of the first conveying pipeline is selectively connected and disconnected through the blind plate or the channel plate, so that the coal gas is selectively introduced into the heat and mass recovery device or the original dust removal device. The device not only can realize safe and efficient recovery of the coal gas heat mass leaving the vaporizing flue boiler, but also can ensure the production continuity of converter steelmaking.

Description

Technical Field

[0001] This utility model belongs to the field of converter gas treatment technology, and in particular relates to a treatment system for the outlet gas of a converter high-temperature gasification flue boiler. Background Technology

[0002] During the oxygen blowing steelmaking process in a converter, crude kerosene gas containing a large amount of CO is generated at temperatures as high as 1450℃-1600℃. To protect downstream equipment and recover energy, the crude kerosene gas is typically cooled by a gasification flue boiler installed above the converter, and its heat is recovered to produce steam. The outlet gas temperature of the high-temperature gasification flue boiler in the converter is around 1000℃ and contains a large amount of dust, requiring cooling and purification through a dust removal process.

[0003] In current converter steelmaking processes, converter gas is primarily treated using either dry or wet dust collection processes. In dry dust collection, the gas passes sequentially through an evaporative cooler and an electrostatic precipitator, where dust removal is achieved through water spray cooling, gravity settling, and electrostatic adsorption. However, this process has the following drawbacks: 1. The sensible heat of the flue gas in the 200℃-1000℃ range is directly discarded, resulting in significant energy loss; 2. The water spraying process in the evaporative cooler consumes a large amount of water, increasing energy and resource costs; 3. Water spraying leads to increased moisture content in the gas, forming "wet gas," which affects the economic viability of subsequent utilization. Wet dust collection, on the other hand, uses high-pressure water spray to wash the flue gas, but it suffers from high energy consumption, requires the treatment of sludge and wastewater, and the sensible heat of the flue gas in the 200℃-1000℃ range is also directly discarded, resulting in even greater energy loss than dry dust collection.

[0004] Both traditional dry and wet dust removal processes result in the direct waste of sensible heat in the flue gas within the 200℃–1000℃ range, causing significant energy loss. Furthermore, cooling the gas requires a large amount of cold water, leading to increased moisture content and the formation of "wet gas," which negatively impacts its calorific value and consequently, its economic viability for subsequent utilization. In addition, when the system needs to shut down due to equipment failure or unforeseen circumstances, the dust removal process will be interrupted, causing gas venting and disrupting the overall production rhythm of the converter steelmaking process.

[0005] Therefore, there is an urgent need to provide a system for treating the outlet gas of a converter high-temperature gasification flue boiler used in the renovation of old plants. Utility Model Content

[0006] To address the shortcomings of existing technologies, this utility model provides a system for treating the outlet gas of a converter high-temperature vaporization flue boiler. This system can achieve safe and efficient heat and mass recovery of the gas leaving the vaporization flue boiler, while also ensuring the continuity of converter steelmaking production.

[0007] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0008] This utility model provides a system for treating the outlet gas of a converter high-temperature gasification flue boiler, including a heat and mass recovery device, a blind flange, a channel plate, and a first conveying pipe of the converter system originally used to convey the gas into the original dust removal device; the heat and mass recovery device includes a second conveying pipe, a third conveying pipe, a dust collector, and a conditioning dust collector configured to spray water to condition and remove dust from the gas; the inlet of the second conveying pipe is connected to the first conveying pipe, the outlet of the second conveying pipe is connected to the inlet of the dust collector, the outlet of the dust collector is connected to the inlet of the conditioning dust collector through the third conveying pipe, and the outlet of the conditioning dust collector is used to connect to an electrostatic precipitator; at least one heat exchange tube section is provided on the third conveying pipe arranged along the gas flow direction; the first conveying pipe and the second conveying pipe can be selectively connected by a blind flange or a channel plate, and the internal channel of the first conveying pipe can be selectively opened or closed by a blind flange or a channel plate to selectively pass the gas into the heat and mass recovery device or into the original dust removal device.

[0009] Optionally, the first conveying pipeline is U-shaped with an opening facing downwards, and has an ascending pipe section that guides the gas to flow upwards and a descending pipe section that guides the gas to flow downwards; the inlet of the second conveying pipeline may optionally be connected to the ascending pipe section via a blind flange or a channel plate, and the ascending pipe section may optionally be connected to the descending pipe section via a blind flange or a channel plate.

[0010] Optionally, the dust collector is a cyclone dust collector, and the heat exchange tube section is a fire tube evaporator.

[0011] Optionally, both the cyclone dust collector and the conditioning dust collector are vertical structures and arranged in the horizontal direction. Two fire-tube evaporators, namely the first fire-tube evaporator and the second fire-tube evaporator, are arranged along the gas flow direction on the third conveying pipe. The heat source gas in the first fire-tube evaporator and the second fire-tube evaporator are arranged in the vertical direction. The first fire-tube evaporator is located above the cyclone dust collector, and the second fire-tube evaporator is located above the conditioning dust collector.

[0012] Optionally, the first conveying pipeline is constructed as a vaporization flue structure; in the second conveying pipeline, the pipeline portion excluding the fire tube evaporator is constructed as a vaporization flue structure.

[0013] Optionally, both the blind flange and the channel plate are equipped with water-cooled heat exchange structures.

[0014] Optionally, the blind plate is circular and includes a blind plate body and a first flange fixedly sleeved on the outer periphery of the blind plate body. The blind plate body is provided with a protective plate, a first heat exchange tube and a high-temperature resistant casting layer in sequence along its thickness direction, wherein the high-temperature resistant casting layer serves as the working surface that is in direct contact with the gas. The first heat exchange tube is coiled and laid on the surface of the protective plate along a serpentine or spiral path.

[0015] Optionally, the channel plate includes a second flange and a second heat exchange tube in an annular shape, the second heat exchange tube being clamped inside the second flange and extending annularly along the circumference of the second flange; or, the cross-section of the second heat exchange tube is semi-circular, one side of the second heat exchange tube is welded to the second flange and extends annularly along the circumference of the second flange.

[0016] Optionally, the second delivery pipeline is equipped with a fire extinguishing device for extinguishing sparks within the pipeline section.

[0017] The beneficial effects of this utility model are:

[0018] This utility model provides a treatment system for the outlet gas of a converter high-temperature gasification flue boiler. In the heat and mass recovery device, heat exchange tubes recover the heat and usable dust from the gas. After heat recovery in the heat exchange tubes, the conditioning and dust collector only needs to spray a small amount of water to cool and condition the gas, significantly reducing the water content per unit volume of gas, ensuring its calorific value, and improving the economic efficiency of subsequent utilization. The switchable connection design of the blind flange and channel plate allows for flexible switching between the heat and mass recovery device and the traditional dust collection device. When the gas treatment system needs maintenance or malfunctions, it can quickly switch to the backup path to prevent gas venting, effectively ensuring the continuity and stability of converter steelmaking production. Attached Figure Description

[0019] This utility model is described with reference to the following drawings:

[0020] Figure 1 This is a schematic diagram of the heat and mass recovery device for the outlet gas of a converter high-temperature gasification flue boiler according to a specific embodiment of the present utility model.

[0021] Figure 2 This is a schematic diagram of the heat and mass recovery device for the outlet gas of a converter high-temperature vaporization flue boiler according to a specific embodiment of the present invention, which includes a steam drum;

[0022] Figure 3 This is a schematic cross-sectional view of the water-cooled blind plate according to a specific embodiment of the present utility model from a top view.

[0023] Figure 4 This is a cross-sectional view of the water-cooled blind plate according to a specific embodiment of the present invention from a side view perspective;

[0024] Figure 5 This is a schematic cross-sectional view of the water-cooled channel plate according to a specific embodiment of the present invention from a top view perspective;

[0025] Figure 6 This is a cross-sectional view of the water-cooled channel plate according to a specific embodiment of the present invention from a side view perspective.

[0026] [Explanation of Labels in the Attached Image]

[0027] 11: Fire extinguishing equipment; 12: First explosion relief valve; 13: First connecting pipe section; 14: First bend pipe section; 15: Second connecting pipe section;

[0028] 21: First fire-tube evaporator; 22: Second fire-tube evaporator; 23: Soot blower; 24: Second explosion relief valve; 25: Second bend in the pipe section;

[0029] 3: Cyclone dust collector;

[0030] 4: Conditioning and dust collector;

[0031] 5: Steam drum;

[0032] 6: Blind plate;

[0033] 61: Protective plate; 62: First heat exchange tube; 63: High-temperature resistant casting layer; 64: First flange;

[0034] 7: Channel board;

[0035] 71: Second heat exchange tube; 72: Second flange;

[0036] 81: Ascending pipe section; 82: Descending pipe section. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0038] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or accompanying drawings of this invention are used to distinguish different objects, not to describe a specific order or hierarchy.

[0039] In this invention, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments.

[0040] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "attachment," and "attachment" should be interpreted broadly. For example, they can refer to direct connection or indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0041] In this invention, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this invention, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0042] In the embodiments of this utility model, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this utility model shown in the drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this utility model.

[0043] In this utility model, "multiple" refers to two or more, including two.

[0044] like Figure 1 As shown, this utility model provides a treatment system for the outlet gas of a converter high-temperature gasification flue boiler, including a heat and mass recovery device, a blind plate 6, a channel plate 7, and the original first conveying pipe of the converter system for conveying gas into the original dust removal device.

[0045] The heat and mass recovery device includes a second conveying pipe, a third conveying pipe, a dust collector, and a conditioning dust collector 4 configured to spray water into the coal gas for conditioning and dust removal. The inlet of the second conveying pipe is connected to the first conveying pipe, the outlet of the second conveying pipe is connected to the inlet of the dust collector, the outlet of the dust collector is connected to the inlet of the conditioning dust collector 4 through the third conveying pipe, and the outlet of the conditioning dust collector 4 is used to connect to an electrostatic precipitator. At least one heat exchange tube section is provided on the third conveying pipe arranged along the coal gas flow direction.

[0046] The first and second conveying pipes can be selectively connected by a blind flange 6 or a channel plate 7. Meanwhile, the internal passage of the first conveying pipe can be selectively opened or closed by the blind flange 6 or the channel plate 7 to selectively pass the gas into the heat recovery device or into the original dust removal device.

[0047] This converter high-temperature gasification flue gas boiler outlet gas treatment system, with its heat and mass recovery unit, recovers heat and usable dust from the gas through heat exchange tubes. After heat recovery in the heat exchange tubes, the conditioning and dust collector 4 only needs to spray a small amount of water to cool and condition the gas, significantly reducing the water content per unit volume of gas, ensuring its calorific value, and improving the economic efficiency of subsequent utilization. The switchable connection design between the blind flange 6 and the channel plate 7 allows for flexible switching between the heat and mass recovery unit and the traditional dust collection unit. When the system needs maintenance or malfunctions, it can quickly switch to the backup path to prevent gas venting, effectively ensuring the continuity and stability of converter steelmaking production.

[0048] During the process of recovering heat and usable dust from coal gas in a heat and mass recovery unit, there is a risk of combustion and explosion of the coal gas in the medium and low temperature range. Specifically, the temperature of the coal gas at the outlet of the converter high-temperature gasification flue boiler is around 1000℃, and the temperature of the coal gas after heat and mass recovery is around 250℃. However, the coal gas contains a large amount of CO, and the combustion and explosion temperature range of coal gas is generally below 650℃. Therefore, when the coal gas is cooled to within the combustion and explosion temperature range after heat exchange, it is very easy to cause CO combustion and explosion, resulting in a series of problems such as equipment damage, system shutdown, and safety risks.

[0049] For the combustion and explosion of the gas at the outlet of a high-temperature gasification flue boiler in a converter to occur, three conditions must be met: 1. The gas temperature is within the combustion and explosion temperature range; 2. The concentrations of carbon monoxide and oxygen in the gas are within a specific ratio range; 3. There are sparks in the gas.

[0050] This invention fully considers the combustion and explosion characteristics of CO during the gas heat exchange process, and installs a fire extinguishing device 11 on the second conveying pipeline to extinguish sparks in the pipe section. In this way, the fire extinguishing device 11 can extinguish sparks in the gas in a timely manner. Combined with the pipeline layout sequence, the timing of fire extinguishing can be controlled before the gas temperature drops to the combustion and explosion range, fundamentally eliminating the risk of CO combustion and explosion and ensuring the safe operation of the system.

[0051] Furthermore, the fire extinguishing equipment 11 is a fire extinguishing sprinkler system.

[0052] Fire-tube evaporators have significant advantages such as high pressure resistance to heat source gas flow, low wear risk, and suitability for heat sources with high dust content. However, there are technical bottlenecks in practical applications: High-temperature molten ash in the gas during converter steelmaking, for example, the high-temperature gas itself contains molten ash, and the use of scrap steel containing elements such as zinc during steelmaking results in a certain concentration of elemental zinc vapor in the flue gas. When flowing through the heat exchange tubes of the fire-tube evaporator, the zinc vapor condenses into zinc droplets upon encountering the cold wall surface and adsorbs dust, adhering to the inner wall of the heat exchange tubes. Since industry standards stipulate that the outer diameter of the heat exchange tubes of fire-tube evaporators should not exceed 133mm, prolonged use can easily lead to blockage of the internal channels of the heat exchange tubes, seriously affecting the normal operation of the equipment. Therefore, this invention fully considers the characteristics of fire tube blockage caused by high-temperature molten ash and zinc vapor condensation into zinc droplets during the application of fire-tube evaporators for gas heat recovery. The dust collector is set as a cyclone dust collector 3, and the heat exchange tube section is set as a fire-tube evaporator. Thus, the cyclone dust collector 3 effectively removes high-temperature molten ash and zinc droplets condensed from zinc vapor in the coal gas through centrifugal action. Specifically, the cyclone dust collector 3 uses centrifugal force to make zinc vapor contact the cold cylinder wall surface and condense into zinc droplets. The molten ash and zinc droplets are thrown to the cylinder wall surface and further cooled down to become low-temperature ash particles before being removed. This solves the technical bottleneck of fire-tube evaporators being easily blocked by molten ash and zinc droplets due to their narrow tube diameter. This allows the coal gas treatment device using the fire-tube evaporator to operate more stably and achieves efficient recovery of sensible heat from the coal gas and large usable dust particles.

[0053] It should be noted that traditional waste heat boilers or gasification flues, due to their large-channel heat exchange design, do not cause significant blockage even when zinc droplets generated by the condensation of high-temperature molten ash and zinc vapor adhere to the wall surface. Therefore, existing technologies generally neglect the removal of high-temperature molten ash and zinc droplets. However, this design approach is not well adapted to fire-tube evaporators. The narrower tube diameter of fire-tube evaporators compared to gasification flues makes them highly susceptible to blockage due to dust adsorption from molten ash and zinc vapor condensation, leading to equipment failure. More importantly, other dust collectors besides the cyclone dust collector 3, such as inertial dust collectors and gravity dust collectors, can only remove solid particles and cannot effectively handle gaseous zinc vapor. This invention cleverly combines a fire-tube evaporator with the cyclone dust collector 3. Through the centrifugal action unique to the cyclone dust collector 3, the zinc vapor comes into contact with the cold wall surface, condenses into droplets, and is further cooled and converted into ash particles for removal. This fundamentally solves the blockage problem caused by molten ash and zinc droplets, allowing the advantages of the fire-tube evaporator to be fully realized.

[0054] It should be noted that the gas heat and mass recovery device not only achieves efficient recovery of the sensible heat and large particulate dust of the gas, but also ensures the calorific value of the gas as much as possible, thus realizing the heat and mass recovery of the gas.

[0055] Specifically, the fire tube evaporator has parallel fire tubes inside, and the outer wall of the fire tube evaporator has a water inlet and a steam outlet that communicate with the space outside the fire tubes. The inside of the fire tubes serves as a flow channel for converter gas, and water is introduced between the fire tubes and the outer wall of the fire tube evaporator for heat absorption and boiling.

[0056] During the renovation of old converter plants, the limited space in existing factory buildings makes renovation difficult, generally only allowing for two fire-tube evaporators. If the second conveying pipeline is designed as an empty flue that does not participate in heat exchange, and all heat recovery load is concentrated on the fire-tube evaporator, the single unit will be enormous in size and weight, posing significant challenges to hoisting and installation. For example, for a 120-ton converter under typical operating conditions of a steam production pressure of 2.5 MPa, if heat recovery relies solely on fire-tube evaporators, the weight of a single unit will exceed 100 tons. Such a massive piece of equipment is almost impossible to hoist and position safely and conveniently within the space-constrained old factory area.

[0057] Therefore, this invention constructs the second conveying pipeline as a vaporization flue structure, and also constructs the portion of the third conveying pipeline, excluding the fire-tube evaporator, as a vaporization flue structure. Through this design, the conveying pipeline itself becomes a heat exchange unit, achieving a reasonable distribution of heat load. Specifically, the pipeline in the vaporization flue structure not only undertakes the function of conveying gas but also performs preliminary heat exchange through its heating surface, effectively recovering some heat and significantly reducing the heat load on the downstream fire-tube evaporator. Under this distributed heat exchange system, the heat exchange required by a single fire-tube evaporator is greatly reduced, thereby significantly reducing its size and weight, facilitating hoisting during old plant renovations.

[0058] The aforementioned construction of the conveying pipeline as a vaporization flue not only solves the installation problem caused by the bulkiness of the fire-tube evaporator, but also generates additional technical advantages: Firstly, the pipe wall temperature of the vaporization flue structure is effectively controlled, reducing the dependence of the first conveying pipeline on the thick refractory castable cylinder wall compared to an empty flue that does not participate in heat exchange. This significantly reduces the furnace wall thickness of the first conveying pipeline from the traditional 600mm or more to about 200mm, further reducing the self-weight of the pipeline system. Secondly, the thermal expansion of the entire heat and mass recovery device is more uniform, improving the stability and safety of the device's operation. Through this integrated design, this utility model achieves the best balance between efficient heat and mass recovery, safe operation, and engineering stability within a limited modification space.

[0059] More preferably, each of the fire-tube evaporators is equipped with a soot blower 23 above the top perforated plate for cleaning dust deposits. Thus, through the soot blower 23, dust is carried away by the flow of gas and, after falling from the fire tubes, enters the dust recovery ports of the cyclone dust collector 3 and the conditioning dust collector 4. This reduces the blockage of the fire tube orifices caused by dust deposition on the top perforated plate of the fire-tube evaporator, improving the heat exchange efficiency and operational stability of the fire-tube evaporator and the entire heat and mass recovery unit.

[0060] Preferably, a first explosion relief valve 12 is installed at the highest point of the second conveying pipeline, and a second explosion relief valve 24 is installed at the highest point of the third conveying pipeline. In this way, even if a combustion or explosion occurs within the calorific value recovery device, the first explosion relief valve 12 and the second explosion relief valve 24 can quickly open to release pressure, protecting the device and further improving its safety.

[0061] Preferably, both the cyclone dust collector 3 and the conditioning dust collector 4 are vertical structures and arranged horizontally, with the heat source gas in the first fire-tube evaporator 21 and the second fire-tube evaporator 22 flowing vertically. This results in a compact heat and mass recovery device that can adapt to the renovation space of existing factory buildings.

[0062] Specifically, in some embodiments, both the first fire-tube evaporator 21 and the second fire-tube evaporator 22 are placed vertically. Of course, the first fire-tube evaporator 21 and the second fire-tube evaporator 22 can also be placed at an angle in the vertical direction.

[0063] Furthermore, in some embodiments, the second conveying pipe has a first connecting pipe section 13, a first bend pipe section 14, and a second connecting pipe section 15 arranged along the gas flow direction. The bottom of the first connecting pipe section 13 is used to connect to the gas outlet of the converter gasification flue boiler. The first end of the first bend pipe section 14 is connected to the top of the first connecting pipe section 13, and the second end of the first bend pipe section 14 is connected to the cyclone dust collector 3 through the second connecting pipe section 15. The third conveying pipe has a first fire tube evaporator 21, a second bend pipe section 25, and a second fire tube evaporator 22 arranged along the gas flow direction. The bottom of the first fire tube evaporator 21 is connected to the top of the cyclone dust collector 3. The first end of the second bend pipe section 25 is connected to the top of the first fire tube evaporator 21, and the second end of the second bend pipe section 25 is connected to the conditioning dust collector 4 through the second fire tube evaporator 22.

[0064] In some embodiments, the fire extinguishing device 11 is installed on the second connecting pipe section 15.

[0065] Specifically, the first explosion relief valve 12 is located at the top of the first bend section 14, and the second explosion relief valve 24 is located at the top of the second bend section 25.

[0066] Specifically, the cyclone dust collector 3 has a gas outlet at the top, a dust recovery port at the bottom, and a gas inlet on the side wall. The second end of the first bend section 14 is connected to the gas inlet of the cyclone dust collector 3 through the second connecting pipe section 15, and the gas outlet of the cyclone dust collector 3 is connected to the first end of the second bend section 25 through the first fire tube evaporator 21.

[0067] Specifically, in this embodiment, the conditioning dust collector 4 is provided with a gas inlet at the top, a dust recovery port at the bottom, and a gas outlet on the lower side wall. The conditioning dust collector 4 is provided with a conditioning spray device at the top. The second end of the second bend section 25 is connected to the gas inlet of the conditioning dust collector 4 through the first connecting pipe section 13. The gas outlet of the conditioning dust collector 4 is used to connect to the electrostatic precipitator.

[0068] The heat and mass recovery device provided by this utility model further includes a steam drum 5, a water supply pipe, and a steam pipe, achieving efficient heat energy recovery and unified management through an integrated steam-water circulation system. Figure 2 As shown, the outlet of the steam drum 5 is connected to the inlet of the water supply pipe. The water supply pipe can be configured as multiple parallel branches, which are respectively connected to the vaporization flue structure of the second conveying pipeline, the vaporization flue structure of the third conveying pipeline, the heat exchange structure of each fire-tube evaporator, and the heat exchange structure in the cyclone dust collector 3, to achieve distributed water supply to each heat exchange unit. At the same time, the steam inlet of the steam drum 5 is connected to the outlet of the steam pipe, which can also be configured as multiple parallel branches for centralized recovery of saturated steam generated by the above-mentioned heat exchange units. This parallel pipeline layout not only realizes the cascade utilization and flexible distribution of heat, but also avoids pipeline cross-interference through rational arrangement, simplifies the system structure, and improves maintenance convenience. After the steam generated by each heat exchange unit is separated into steam and water in the steam drum 5, the saturated steam enters the steam pipeline network for production use, while the separated saturated water re-participates in the circulating heat exchange through the water supply pipe, forming a closed-loop heat energy recovery system.

[0069] Specifically, a circulation pump is installed on the water supply pipe.

[0070] In the old plant, the converter system has a dust removal device and a first conveying pipe for transporting coal gas into the dust removal device. The dust removal device can be a dry dust removal device or a wet dust removal device. The dry dust removal device includes an evaporative cooler and an electrostatic precipitator connected along the coal gas flow direction, while the wet dust removal device includes a primary venturi tube and a secondary venturi tube connected along the coal gas flow direction.

[0071] Preferably, both the blind flange 6 and the channel plate 7 are equipped with water-cooled heat exchange structures. The water-cooled heat exchange structures effectively control the operating temperature of the blind flange 6 and the channel plate 7, avoiding component thermal deformation or damage caused by high-temperature gas, and significantly enhancing system safety and service life.

[0072] Specifically, such as Figure 3 and Figure 4 As shown, the blind flange 6 is circular and includes a blind flange body and a first flange 64 fixedly fitted around the outer periphery of the blind flange body. The blind flange body has a protective plate 61, a first heat exchange tube 62, and a high-temperature resistant casting layer 63 arranged sequentially along its thickness direction. The high-temperature resistant casting layer 63 serves as the working surface in direct contact with the gas. The first heat exchange tube 62 starts from the first end of the protective plate 61 and is coiled along a serpentine path on the surface of the protective plate 61, extending to the second end of the protective plate 61. Optionally, the first heat exchange tube 62 coils from the edge of the protective plate 61 along a spiral path to the center of the protective plate 61, and then coils back from the center of the protective plate 61 along a spiral path to the edge of the protective plate 61. Furthermore, the serpentine or spiral path of the first heat exchange tube 62 continuously covers the contact area between the protective plate 61 and the gas. This achieves uniform and efficient cooling of the surface of the protective plate 61, effectively preventing component thermal deformation or damage caused by localized high temperatures.

[0073] Specifically, such as Figure 5 and Figure 6 As shown, the channel plate 7 includes a second flange 72 in an annular shape and a second heat exchange tube 71 clamped within the second flange 72. The second heat exchange tube 71 extends annularly along the circumference of the second flange 72. Optionally, the cross-section of the second heat exchange tube 71 is semi-circular, and one side of the second heat exchange tube 71 is welded to the second flange 72 and extends annularly along the circumference of the second flange 72.

[0074] Specifically, the inlet of the first heat exchanger tube 62 is connected to the water supply pipe, and the outlet of the first heat exchanger tube 62 is connected to the steam pipe; the inlet of the second heat exchanger tube 71 is connected to the water supply pipe, and the outlet of the second heat exchanger tube 71 is connected to the steam pipe. The water supply pipe supplies circulating water to the first heat exchanger tube 62 and the second heat exchanger tube 71, and the steam generated after absorbing heat is recovered to the steam drum 5 through the steam pipe, realizing continuous heat exchange.

[0075] Preferably, the first conveying pipeline is U-shaped with an opening facing downwards, and has an ascending pipe section 81 that guides the gas upwards and a descending pipe section 82 that guides the gas downwards. The inlet of the first conveying pipeline can be optionally connected to the upper part of the ascending pipe section 81 via a blind flange 6 or a channel plate 7, and the ascending pipe section 81 can be optionally connected to the descending pipe section 82 via a blind flange 6 or a channel plate 7. In this way, flow stagnation zones or sharp bends common in traditional pipelines are avoided, thereby fundamentally eliminating ash accumulation dead zones.

[0076] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A system for treating the outlet gas of a converter high-temperature gasification flue boiler, characterized in that, Includes heat recovery device, blind flange (6), channel plate (7) and the original first conveying pipe of the converter system used to convey gas into the original dust removal device; The heat recovery device includes a second conveying pipe, a third conveying pipe, a dust collector, and a conditioning dust collector (4) configured to spray water into the coal gas for conditioning and dust removal; the inlet of the second conveying pipe is connected to the first conveying pipe, the outlet of the second conveying pipe is connected to the inlet of the dust collector, the outlet of the dust collector is connected to the inlet of the conditioning dust collector (4) through the third conveying pipe, and the outlet of the conditioning dust collector (4) is used to connect to an electrostatic precipitator; at least one heat exchange tube section is provided on the third conveying pipe arranged along the coal gas flow direction; The first and second conveying pipes can be selectively connected by a blind flange (6) or a channel plate (7), and the internal channel of the first conveying pipe can be selectively opened or closed by a blind flange (6) or a channel plate (7) to selectively pass the gas into the heat recovery device or into the original dust removal device.

2. The gas treatment system for the outlet gas of the converter high-temperature vaporization flue boiler according to claim 1, characterized in that, The first conveying pipeline is U-shaped with an opening facing downwards, and has an ascending pipe section (81) that guides the gas to flow upwards and a descending pipe section (82) that guides the gas to flow downwards; the inlet of the second conveying pipeline can be selectively connected to the upper part of the ascending pipe section (81) through a blind flange (6) or a channel plate (7), and the ascending pipe section (81) can be selectively connected to the descending pipe section (82) through a blind flange (6) or a channel plate (7).

3. The system for treating the outlet gas of a converter high-temperature vaporization flue boiler according to claim 1, characterized in that, The dust collector is a cyclone dust collector (3), and the heat exchange tube section is a fire tube evaporator.

4. The system for treating the outlet gas of a converter high-temperature vaporization flue boiler according to claim 3, characterized in that, Both the cyclone dust collector (3) and the conditioning dust collector (4) are vertical structures and are arranged in the horizontal direction. Two fire tube evaporators are arranged along the gas flow direction on the third conveying pipe, namely the first fire tube evaporator (21) and the second fire tube evaporator (22). The heat source gas in the first fire tube evaporator (21) and the second fire tube evaporator (22) are arranged in the vertical direction. The first fire tube evaporator (21) is located above the cyclone dust collector (3) and the second fire tube evaporator (22) is located above the conditioning dust collector (4).

5. The system for treating the outlet gas of a converter high-temperature vaporization flue boiler according to claim 1, characterized in that, The first conveying pipeline is constructed as a vaporization flue structure; in the second conveying pipeline, the pipeline portion excluding the fire tube evaporator is constructed as a vaporization flue structure.

6. The gas treatment system for the outlet gas of the converter high-temperature vaporization flue boiler according to claim 5, characterized in that, Both the blind plate (6) and the channel plate (7) are equipped with water-cooled heat exchange structures.

7. The gas treatment system for the outlet gas of the converter high-temperature vaporization flue boiler according to claim 6, characterized in that, The blind plate (6) is round and includes a blind plate body and a first flange (64) fixedly sleeved on the outer periphery of the blind plate body. The blind plate body is provided with a protective plate (61), a first heat exchange tube (62) and a high-temperature resistant casting layer (63) in sequence along its thickness direction. The high-temperature resistant casting layer (63) serves as the working surface that is in direct contact with the gas. The first heat exchange tube (62) is coiled and laid on the surface of the protective plate (61) along a serpentine or spiral path.

8. The system for treating the outlet gas of a converter high-temperature vaporization flue boiler according to claim 6, characterized in that, The channel plate (7) includes a second flange (72) and a second heat exchange tube (71) in an annular shape. The second heat exchange tube (71) is clamped inside the second flange (72) and extends in an annular shape along the circumference of the second flange (72); or, the cross-section of the second heat exchange tube (71) is semi-circular, and one side of the plane of the second heat exchange tube (71) is welded to the second flange (72) and extends in an annular shape along the circumference of the second flange (72).

9. The system for treating the outlet gas of a converter high-temperature vaporization flue boiler according to claim 1, characterized in that, The second delivery pipeline is equipped with fire extinguishing equipment (11) for extinguishing sparks in the pipeline section.

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