Evaporative cooling device and cooling method for high-temperature flue gas

Abstract

The invention provides a high-temperature flue gas evaporative cooling device which comprises a converter and an evaporative cooling flue, one end of the evaporative cooling flue is connected with the output end of the converter, the evaporative cooling flue is composed of a plurality of water cooling wall sections, and at least one heat accumulator section is fixedly arranged in the evaporative cooling flue. A phase change heat storage material is distributed in the heat accumulator section; an oxygen blowing gun opening is fixedly arranged at one end, close to the converter, of the evaporative cooling flue, and a water-cooled high-temperature-resistant gate valve is fixedly arranged on the evaporative cooling flue based on the lower portion of the oxygen blowing gun opening. The evaporative cooling flue is provided with the phase change heat storage device and filled with the phase change heat storage material, when the temperature of passing flue gas is lower than the set temperature, the phase change heat storage material is subjected to phase change and releases heat, and the phenomenon that the water cooling wall section suffers from alternating thermal stress due to the flue gas temperature difference is avoided; and a water-cooled high-temperature-resistant gate valve is arranged, so that excessive cold air suction is reduced, and the alternating thermal stress of the evaporative cooling flue is further reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of energy-saving and environmental protection equipment, and in particular to a vaporization cooling device and a cooling method for high-temperature flue gas. Background Art

[0002] In recent years, air quality issues have attracted great attention from the whole society. As a major industrial emitter, the steel industry is subject to increasingly strict restrictions on its emission standards and emissions.

[0003] China's steel industry is in a period of structural adjustment, optimization and upgrading. Facing increasingly severe resource and environmental pressures, it must take the path of sustainable development that is resource-saving, environmentally friendly and must be developed.

[0004] As the main steelmaking process of steel enterprises, converter steelmaking produces gas mainly containing carbon monoxide, a small amount of carbon dioxide and other trace components during the blowing process, which also carries a large amount of iron oxide, metal iron particles, and other fine particles of solid dust, which seriously pollutes the atmosphere and workshop environment. Therefore, improving the technical level of converter dust removal system, recycling and utilizing converter gas and recovering flue gas waste heat are of great significance for energy saving and consumption reduction in steelmaking, effectively controlling and reducing the emission of atmospheric pollutants in steelmaking, and reducing environmental pollution.

[0005] The temperature of converter flue gas outlet is about 1400-1600℃, and the dust concentration is 70-200g / m 3 After leaving the furnace, the gas is usually cooled to 800-1000℃ by vaporization cooling flue or water cooling flue, and then enters the flue gas dust removal system to reduce the dust concentration to meet the national emission standards and the requirements of gas users. At present, the domestic converter primary flue gas dust removal processes mainly include traditional OG method, new OG method, semi-dry method, and dry method (LT method).

[0006] In the prior art, no matter which of the above-mentioned process systems is adopted for primary converter flue gas purification, the common feature is that the high-temperature converter flue gas is cooled to 800°C-1000°C through heat exchange in the converter vaporization cooling flue (i.e., waste heat boiler) and enters the next stage of treatment.

[0007] Converter Evaporation Cooling Flue is a flue-type waste heat boiler widely used to recover the heat from the high-temperature dusty flue gas and coal gas generated during converter steelmaking in steel plants. Converter Evaporation Cooling Flue is directly used in the converter steelmaking process and directly participates in production as part of the steelmaking process in steel plants.

[0008] The characteristics of the converter production process, that is, oxygen blowing smelting is not continuous. Therefore, the temperature of the flue gas in the vaporization cooling flue is always in a working state of alternating heating and cooling cycles, resulting in a large alternating thermal stress in the vaporization cooling flue. Under the action of alternating thermal stress, the service life of the vaporization cooling flue is short, and the workload of daily maintenance and repair is large, which to a certain extent also has a great impact on the converter steelmaking production. How to ensure that the temperature of the flue gas output from the tail flue of the converter vaporization cooling flue is between 800-000℃, and how to ensure the safe and stable operation and long service life of the vaporization cooling flue is also a technical issue of great concern in this field. Summary of the invention

[0009] The technical problem to be solved by the present invention is to overcome the defects of the prior art. The present invention proposes a vaporization cooling device and a cooling method for high-temperature flue gas, which control the flue gas temperature output from the tail flue at 800-1000°C while ensuring the safe and stable operation and long service life of the vaporization cooling flue.

[0010] In order to solve the above technical problems, the technical solution adopted by the present invention is: a high-temperature flue gas vaporization cooling device, comprising a converter and a vaporization cooling flue, one end of the vaporization cooling flue is sealed and connected to the output end of the converter, the vaporization cooling flue is composed of a plurality of water-cooled wall sections, at least one heat accumulator section is fixedly arranged in the vaporization cooling flue, and a phase change heat storage material is arranged in the heat accumulator section;

[0011] The aforementioned phase change heat storage material can be any one of metal and alloy phase change heat storage materials, molten salt phase change heat storage materials, carbonate phase change heat storage materials, metal-based composite phase change materials and ceramic-based composite phase change materials; among which alloy phase change heat storage materials include aluminum-silicon alloy phase change heat storage materials and copper alloy phase change heat storage materials, among which molten salt phase change heat storage materials include fluoride salts and their eutectic compounds, such as LiF-NaF-KF eutectic salt; among which carbonate phase change composite materials such as Li2CO3-Na2CO3-K2CO3 eutectic salt; among which metal-based composite phase change materials include aluminum-based / silicon carbide composite phase change materials; among which ceramic-based composite phase change materials include zirconium oxide / inorganic salt composite phase change materials, which can be selected according to actual needs.

[0012] An oxygen blowing gun nozzle is fixedly arranged on one end of the vaporization cooling flue close to the converter, and a water-cooled high-temperature resistant gate valve is fixedly arranged on the vaporization cooling flue below the oxygen blowing gun nozzle.

[0013] Furthermore, the vaporization cooling flue comprises a connecting section, a straight section and a curved section connected in sequence, the connecting section and the curved section are both composed of water-cooled wall sections, the straight section is composed of several water-cooled wall sections, and adjacent water-cooled wall sections are connected and penetrated by a heat accumulator section.

[0014] Furthermore, the heat accumulator section arranged on the straight section includes a first heat accumulator section and a second heat accumulator section, the first heat accumulator section is fixedly arranged on the straight section close to the connecting section, and the oxygen blowing gun nozzle and the water-cooled high-temperature resistant gate valve are fixedly arranged on the water-cooled wall section between the first heat accumulator section and the connecting section.

[0015] Furthermore, a water-cooled high-temperature valve is fixedly provided on the straight section on one side of the first heat accumulator section away from the oxygen blowing gun port and the water-cooled high-temperature resistant plug valve, for injecting high-temperature flue gas into the vaporization cooling flue.

[0016] Furthermore, the heat accumulator section includes a plurality of smoke-passing cavities opened in the height direction of the heat accumulator section, and a heat-insulating layer is wrapped around the outside of the heat accumulator section;

[0017] The smoke-passing inner cavity is a cylindrical structure, including a first smoke-passing inner cavity fixedly arranged at the center position of the heat accumulator section and a plurality of circles of second smoke-passing inner cavities radially arranged along the heat accumulator section, the intervals between the second smoke-passing inner cavities in each circle are the same, and in each circle of the second smoke-passing inner cavities, the intervals between adjacent second smoke-passing inner cavities are the same, and phase change heat storage materials are arranged in the gaps of the second smoke-passing inner cavities.

[0018] Furthermore, the heat accumulator section includes a plurality of smoke-passing cavities opened in the height direction of the heat accumulator section, and a heat-insulating layer is wrapped around the outside of the heat accumulator section;

[0019] The smoke-passing inner cavity includes a first smoke-passing inner cavity located at the center of the heat accumulator section and a plurality of circles of second smoke-passing inner cavities radially arranged around the first smoke-passing inner cavity, the first smoke-passing inner cavity is a cylindrical hole, the plurality of circles of the second smoke-passing inner cavity are split based on the center of the first smoke-passing inner cavity, the central angles of the single second smoke-passing inner cavities in each circle are the same, and a phase change heat storage material is arranged on the outer edge surface of the second smoke-passing inner cavity.

[0020] The aforementioned thermal insulation layer can be any one of nano-scale microporous thermal insulation materials, thermal insulation coatings, ceramic fibers and composite thermal insulation materials, and can be selected according to actual needs.

[0021] Furthermore, the water-cooled wall section includes a water-cooled wall body and a plurality of water-cooled tubes arranged based on the water-cooled wall body.

[0022] Furthermore, the curved section is composed of odd-numbered water-cooled wall sections connected end to end, and a high-temperature resistant spring self-resetting explosion relief device is also arranged on the curved section.

[0023] Furthermore, the vaporization cooling flue is connected to the output end of the converter via a movable smoke hood and a hood skirt.

[0024] Furthermore, a high-temperature flue gas vaporization cooling method uses a high-temperature flue gas vaporization cooling device to provide heat storage conditions for the vaporization cooling flue, while reducing the intake of cold air and inputting hot air into the vaporization cooling flue to adjust the flue gas temperature passing through the vaporization cooling flue.

[0025] Compared with the prior art, the beneficial effects of the present invention include:

[0026] 1) A phase change heat storage device is arranged on the straight section of the vaporization cooling flue, and is filled with a phase change heat storage material. When the temperature of the flue gas passing through is lower than the set temperature, the phase change heat storage material undergoes a phase change and releases heat to ensure that the temperature of the flue gas passing through is maintained within the set temperature range, thereby ensuring that the temperature of the flue gas is relatively constant when passing through the water-cooled wall section, avoiding the water-cooled wall section from being subjected to alternating thermal stress due to the difference in flue gas temperature, effectively improving the service life of the water-cooled wall tube of the vaporization cooling flue, and minimizing the workload of daily maintenance and repair of the vaporization cooling flue, ensuring the stability and reliability of converter steelmaking production; and a water-cooled high-temperature resistant gate valve is arranged at the front section of the straight section, which is used to adjust the air volume drawn into the vaporization cooling flue port after the converter finishes oxygen blowing smelting, reduce the excessive cold air intake, and further reduce the alternating thermal stress of the vaporization cooling flue;

[0027] 2) A hot air inlet is also provided on the straight section of the vaporization cooling flue. The hot air inlet is provided behind the water-cooled high-temperature resistant gate valve to adjust the flue gas temperature passing through the vaporization cooling flue and further reduce the sudden thermal stress of the vaporization cooling flue. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The disclosure of the present invention is described with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of the present invention. In the accompanying drawings, the same reference numerals are used to refer to the same components. Among them:

[0029] Figure 1 The overall structure of the high-temperature flue gas vaporization cooling device is schematically shown;

[0030] Figure 2 Schematically shows a cross-sectional structure of a first embodiment of a heat accumulator segment;

[0031] Figure 3 Schematically shows a cross-sectional structure of a second embodiment of a heat accumulator segment;

[0032] Figure 4 The schematic diagram shows the layout of the water cooling tubes in the water wall section;

[0033] Figure 5 The overall structure of the converter primary flue gas pure dry purification system is schematically shown.

[0034] Numbers in the figure: 1-converter, 2-evaporation cooling flue, 3-connecting section, 4-straight section, 5-bending section, 6-movable smoke hood and skirt, 7-water-cooled wall section, 8-water-cooling pipe, 9-first heat accumulator section, 10-second heat accumulator section, 11-oxygen blowing gun nozzle, 12-water-cooled high-temperature resistant plug valve, 13-water-cooled high-temperature valve, 14-high-temperature resistant spring self-resetting explosion relief device, 15-first smoke passage inner cavity, 16-second smoke passage inner cavity cavity, 17-thermal insulation layer, 18-gas burner, 19-high-temperature phase-change heat storage device, 20-water-cooled three-way high-temperature reversing valve, 21-rapid cooling waste heat boiler, 22-dust collector, 23-flue gas waste heat recovery device, 24-axial flow fan, 25-switching valve, 26-dispersion chimney, 27-gas cabinet, 28-first water-cooled two-way high-temperature reversing valve, 29-second water-cooled two-way high-temperature reversing valve, 30-phase-change heat storage material. DETAILED DESCRIPTION

[0035] It is easy to understand that according to the technical solution of the present invention, without changing the essential spirit of the present invention, a person skilled in the art can propose a variety of interchangeable structural modes and implementation modes. Therefore, the following specific implementation modes and drawings are only exemplary descriptions of the technical solution of the present invention, and should not be regarded as the whole of the present invention or as a limitation or restriction to the technical solution of the present invention.

[0036] Figure 1 The overall structure of the high-temperature flue gas vaporization cooling device is schematically shown. Figure 1As shown, it includes a converter 1 and a vaporization cooling flue 2. One end of the vaporization cooling flue 2 is sealedly connected to the output end of the converter 1 by a movable smoke hood and a hood skirt 6, which is used to meet the sealing connection requirements between the vaporization cooling flue 2 and the output end of the converter 1 while taking into account the need for adjustment of the relative angular position between the two. The aforementioned vaporization cooling flue 2 is composed of several sections of water-cooled walls. At least one section of heat storage device is fixedly arranged in the vaporization cooling flue 2, and a phase change heat storage material 30 is arranged in the heat storage device. Due to the process characteristics of the production of the converter 1, its own oxygen blowing smelting process is not continuous. Therefore, the flue gas temperature in the vaporization cooling flue 2 is always in a working state of alternating heating and cooling cycles, which causes a large alternating thermal stress in the vaporization cooling flue 2, especially for the water-cooled wall section 7, which has obvious damage to its service life. By arranging a heat accumulator section therein, such as the phase change heat storage material 30 therein, the temperature range of the high temperature section is set to 1250-1650°C. When the temperature of the flue gas passing through the heat accumulator section is lower than the aforementioned temperature range, the phase change heat storage material 30 releases heat during phase change, thereby ensuring that the water-cooled wall section 7 is within the set temperature range (i.e., 350-550°C), thereby avoiding the effect of alternating thermal stress of the water-cooled wall tubes of the vaporization cooling flue 2, effectively improving the service life of the water-cooled wall tubes of the vaporization cooling flue 2, and minimizing the workload of daily maintenance and repair of the vaporization cooling flue 2, thereby ensuring the stability and reliability of the steelmaking production of the converter 1.

[0037] An oxygen blowing lance 11 is fixedly arranged on one end of the aforementioned vaporization and cooling flue 2 close to the converter 1 (i.e., the inlet end of the vaporization and cooling flue 2), and a water-cooled high-temperature resistant gate valve 12 is fixedly arranged on the vaporization and cooling flue 2 below the aforementioned oxygen blowing lance 11. After the converter 1 finishes oxygen blowing smelting, the length of the valve plate of the calcium water-cooled high-temperature resistant gate valve 12 extending into the vaporization and cooling flue 2 is adjusted to adjust the air volume drawn into the vaporization and cooling flue 2, reduce the intake of excessive cold air, ensure the temperature inside the vaporization and cooling flue 2, and reduce the alternating thermal stress of the vaporization and cooling flue 2.

[0038] The vaporization cooling flue 2 is described in detail below. The vaporization cooling flue 2 includes a connecting section 3, a straight section 4, and a curved section 5 connected in sequence. The connecting section 3 and the curved section 5 are both composed of a water-cooled wall section 7. The straight section 4 is composed of a plurality of water-cooled wall sections 7, and in the straight section 4, adjacent water-cooled wall sections 7 are connected and penetrated by a heat accumulator section. In some embodiments, the heat accumulator section disposed on the straight section 4 includes a first heat accumulator section 9 and a second heat accumulator section 10, so that three water-cooled wall sections 7 are included in the straight section 4. The aforementioned first heat accumulator section 9 is fixedly disposed on the straight section 4 close to the connecting section 3, and the oxygen blowing gun nozzle 11 and the water-cooled high-temperature resistant gate valve 12 are fixedly disposed on the first water-cooled wall section 7, and the water-cooled wall section 7 is smoothly connected with the connecting section 3. A water-cooled high-temperature valve 13 is fixedly arranged on the second water-cooled wall section 7 above the straight section 4, and the aforementioned water-cooled high-temperature valve 13 is fixedly arranged on the side of the first heat accumulator section 9 away from the oxygen blowing gun mouth 11 and the water-cooled high-temperature resistant gate valve 12. High-temperature flue gas can be injected into the straight section 4 through the aforementioned water-cooled high-temperature valve 13 to adjust the flue gas temperature passing through the vaporization cooling flue 2, thereby further reducing the alternating thermal stress of the vaporization cooling flue 2.

[0039] The following is a detailed description of the heat accumulator section. The heat accumulator section includes a plurality of smoke-passing cavities that are opened in the height direction of the heat accumulator section. The heat accumulator section is wrapped with a heat insulation layer 17 on the outside. However, there are multiple layout methods inside the heat accumulator section, as follows:

[0040] Example 1

[0041] like Figure 2 As shown, the first smoke-passing inner cavity 15 and the second smoke-passing inner cavity 16 arranged in the heat accumulator section are both cylindrical structures, including a first smoke-passing inner cavity 15 fixedly arranged at the center of the heat accumulator section and a plurality of circles of second smoke-passing inner cavities 16 arranged radially, the intervals between each circle of second smoke-passing inner cavities 16 are the same, and in each circle of second smoke-passing inner cavities 16, the intervals between adjacent second smoke-passing inner cavities 16 are the same, and the phase change heat storage material 30 is arranged in the gaps of the second smoke-passing inner cavities 16.

[0042] For example, three circles of second smoke-passing inner cavities 16 are arranged radially along the heat accumulator section, the innermost circle (i.e., the first circle) of the second smoke-passing inner cavities 16 consists of 6 second smoke-passing inner cavities 16, the second circle of the second smoke-passing inner cavities 16 consists of 12 second smoke-passing inner cavities 16, and the outermost circle (i.e., the third circle) of the second smoke-passing inner cavities 16 consists of 18 second smoke-passing inner cavities 16. The positions of the aforementioned second smoke-passing inner cavities 16 are determined by splitting the heat accumulator based on the center point according to the central angle of the circle.

[0043] It is worth noting that, in some embodiments, a first smoke-passing inner cavity 15 disposed at the center of the heat accumulator section may have a different diameter from a plurality of circles of second smoke-passing inner cavities 16 disposed along the radial direction for distinction.

[0044] Example 2

[0045] like Figure 3 As shown, the heat accumulator section includes a plurality of smoke-passing cavities opened in the height direction of the heat accumulator section, and a thermal insulation layer 17 is wrapped on the outside of the heat accumulator section; the smoke-passing cavities include a first smoke-passing cavity 15 located at the center of the heat accumulator section and a second smoke-passing cavity 16 radially arranged around the first smoke-passing cavity 15, wherein the first smoke-passing cavity 15 is a cylindrical hole, and the plurality of circles of second smoke-passing cavities 16 are divided into a plurality of separate second smoke-passing cavities 16 based on the center of the first smoke-passing cavity 15, each of which has the same central angle, and a phase change heat storage material 30 is arranged on the outer edge surface of the second smoke-passing cavity 16.

[0046] For example, after the first smoke-passing inner cavity 15 is arranged at the center of the heat accumulator, three circles of annular cavities are arranged in the heat accumulator section based on the outer side of the first smoke-passing inner cavity 15, and then the three circles of annular cavities are split according to the central angle of 45° to form a plurality of second smoke-passing inner cavities 16, that is, the second smoke-passing inner cavity 16 is actually arc-shaped, and each circle of annular cavities includes 8 second smoke-passing inner cavities 16; and between each circle of second smoke-passing inner cavities 16, the spacing between adjacent smoke-passing inner cavities is exactly the same, and the spacing between multiple circles of second smoke-passing inner cavities 16 along the radial direction can be set according to actual requirements.

[0047] It is worth noting that, among the two circles of the second smoke-passing inner cavities 16 located on the inner side, there are any three of the second smoke-passing inner cavities 16 that are not provided with the phase-change thermal storage material 30 on the outer side, and among the second smoke-passing inner cavities 16 in the outermost circle, only one second smoke-passing inner cavity 16 is provided with the phase-change thermal storage material 30 on the outer side, and a thermal insulation layer 17 is provided on the side of the second smoke-passing inner cavity 16 facing the thermal storage section. The aforementioned phase-change thermal storage material 30 can be provided based on the specific position of the second smoke-passing inner cavity 16, and is not limited to the aforementioned embodiment.

[0048] The water-cooled wall section 7 includes a water-cooled wall body and a plurality of water-cooled pipes 8 arranged based on the water-cooled wall body. The water-cooled wall body may be a hollow structure, and the plurality of water-cooled pipes 8 are fixedly arranged and fixed in the aforementioned water-cooled wall body. Figure 4 As shown, a plurality of water-cooling tubes 8 are fixed in an externally cut manner, and the flue gas flowing through the water-cooling wall section 7 can be cooled by introducing a refrigerant such as cooling water into the water-cooling tubes 8 .

[0049] The aforementioned curved section 5 is composed of an odd number of water-cooled wall sections 7 connected end to end, and a high temperature resistant spring self-resetting explosion relief device 14 is also arranged on the curved section 5 to complete the pressure relief process of the vaporization cooling flue 2. The aforementioned water-cooled wall section 7 constituting the curved section 5 is a curved shape structure, and the length of the inner side of the aforementioned water-cooled wall section 7 is shorter than the length of the outer side, so that a curved structure can be formed after multiple sections of water-cooled wall sections 7 are connected end to end, and the aforementioned connection method can be used between the connecting section 3 and the straight section 4, and between the straight section 4 and the curved section 5, and the high temperature resistant spring self-resetting explosion relief device 14 is fixedly arranged based on the top of the outer side of the curved section 5.

[0050] A method for vaporizing and cooling high-temperature flue gas is disclosed. A vaporizing and cooling device for high-temperature flue gas is applied. A plurality of heat storage sections are arranged in a vaporizing and cooling flue 2. A phase-change heat storage material 30 is arranged in the heat storage section. When the temperature of the flue gas passing through is lower than that of the phase-change heat storage material 30, the phase-change heat storage material 30 undergoes a phase change to release heat, thereby ensuring that the temperature of the flue gas in the vaporizing and cooling flue 2 is in a cooling working state. The phase-change heat storage material 30 in the heat storage section can release heat to put the vaporizing and cooling flue 2 in a heating working state, thereby avoiding the effect of alternating thermal stress of the water-cooled wall tubes of the vaporizing and cooling flue 2, effectively improving the service life of the water-cooled wall tubes of the vaporizing and cooling flue 2, minimizing the workload of daily maintenance and repair of the vaporizing and cooling flue 2, and ensuring the stability and reliability of the steelmaking production of the converter 1. At the same time, a water-cooled high-temperature resistant gate valve 12 is provided below the oxygen blowing gun 11. The amount of air drawn in is further adjusted by the length of the water-cooled high-temperature resistant gate valve 12 inserted into the vaporization cooling flue 2. When the temperature in the vaporization cooling flue 2 is in a cooling working state, the inhalation of cold air can be effectively avoided, thereby reducing the alternating thermal stress of the vaporization cooling flue 2. A hot air inlet equipped with a water-cooled high-temperature valve 13 is provided at the rear end of the water-cooled high-temperature resistant gate valve 12 to further adjust the flue gas temperature passing through the vaporization cooling flue 2, thereby further reducing the alternating thermal stress of the vaporization cooling flue 2.

[0051] The above-mentioned vaporization cooling device is applied to the pure dry purification system of primary flue gas of converter. Figure 5 The overall structure of the converter primary flue gas pure dry purification system is shown schematically. Figure 5As shown, the converter primary flue gas pure dry purification treatment system includes a gas burner 18, a high temperature phase change heat storage device 19, a quenching waste heat boiler 21, a dust collector 22 and a flue gas waste heat recovery device 23. The input end of the flue gas waste heat recovery device 23 is connected to the output end of the dust collector 22, and the output end of the flue gas waste heat recovery device 23 is connected to the axial flow fan 24. The output end of the axial flow fan 24 is connected to a switching valve 25, one end of the switching valve 25 is connected to the venting chimney 26, and the other end is connected to the gas tank 27. The flue gas temperature output from the converter 1 is 1450-1650°C, and the flue gas temperature output from the vaporization cooling flue 2 is 800-1000°C.

[0052] It also includes a water-cooled three-way high-temperature reversing valve 20, the first channel of the input end of the water-cooled three-way high-temperature reversing valve 20 is connected to the gas burner 18, the second channel is connected to the input end of the high-temperature phase-change heat storage device 19, and the third channel is connected to the input end of the first water-cooled two-way high-temperature reversing valve 28. The first output end of the first water-cooled two-way high-temperature reversing valve 28 is connected to the input end of the dust collector 22, and the second output end is connected to the input end of the quenching waste heat boiler 21, and the output end of the quenching waste heat boiler 21 is also connected to the input end of the dust collector 22. The output end of the high-temperature phase-change heat storage device 19 is connected to the input end of the quenching waste heat boiler 21 through the second water-cooled two-way high-temperature reversing valve 29.

[0053] It is worth noting that a pneumatic ash conveying and sending unit is provided below the high-temperature phase-change heat storage device 19, the quenching waste heat boiler 21 and the dust collector 22, and is equipped with a fluidizing device to completely guide the accumulated ash in the high-temperature phase-change heat storage device 19, the quenching waste heat boiler 21 and the dust collector 22 into the pneumatic ash conveying and sending unit. An emergency blowing device is also provided, and its output end is connected to the input end of the high-temperature phase-change heat storage device 19, the quenching waste heat boiler 21 and the dust collector 22. The outputs of the aforementioned pneumatic ash conveying and sending unit, the fluidizing device and the emergency blowing device are all compressed nitrogen.

[0054] The high-temperature flue gas generated in the converter 1 is input into the input end of the water-cooled three-way high-temperature reversing valve 20 through the vaporization cooling flue 2 connected to the output end thereof. A movable smoke hood and a hood skirt 6 are provided between the vaporization cooling flue 2 and the converter 1, so that the high-temperature flue gas output from the converter 1 can completely flow to the vaporization cooling flue 2 without leaking out. A flue gas pressure transmitter, a flue gas temperature transmitter and a measuring device for measuring the O2, CO and H2 contents in the flue gas are provided at the output end of the vaporization cooling flue 2. After being measured by the measuring device, the high-temperature flue gas is selectively input into one of the gas burner 18, the high-temperature phase change heat storage device 19 and the dust collector 22 by regulating the water-cooled three-way high-temperature reversing valve 20 to complete the purification process of the flue gas from the converter 1.

[0055] CO can be input into the gas burner 18 through the other input end of the aforementioned gas burner 18, and its output end is connected to the vaporization cooling flue 2. A water-cooled high-temperature resistant gate valve 12 is provided between the output end of the gas burner 18 and the connection between the converter 1 and the movable smoke hood to regulate the input or output of high-temperature flue gas.

[0056] The technical scope of the present invention is not limited to the contents in the above description. Those skilled in the art can make various deformations and modifications to the above embodiments without departing from the technical idea of ​​the present invention, and these deformations and modifications should all fall within the protection scope of the present invention.

Claims

1. A high-temperature flue gas vaporization cooling device, comprising a converter (1) and a vaporization cooling flue (2), wherein one end of the vaporization cooling flue (2) is sealedly connected to the output end of the converter (1), and the vaporization cooling flue (2) is composed of a plurality of water-cooled wall sections (7), characterized in that: At least one heat storage section is fixedly arranged in the vaporization cooling flue (2), and a phase change heat storage material (30) is arranged in the heat storage section; An oxygen blowing nozzle (11) is fixedly arranged on one end of the vaporization cooling flue (2) close to the converter (1), and a water-cooled high-temperature resistant gate valve (12) is fixedly arranged on the vaporization cooling flue (2) below the oxygen blowing nozzle (11).

2. The high-temperature flue gas evaporation cooling device according to claim 1, characterized in that: The vaporization cooling flue (2) comprises a connecting section (3), a straight section (4) and a curved section (5) which are connected in sequence, the connecting section (3) and the curved section (5) are both composed of a water-cooled wall section (7), the straight section (4) is composed of a plurality of water-cooled wall sections (7), and adjacent water-cooled wall sections (7) are connected and interlinked by a heat accumulator section.

3. The high-temperature flue gas evaporation cooling device according to claim 2, characterized in that: The heat accumulator section arranged on the straight section (4) comprises a first heat accumulator section (9) and a second heat accumulator section (10); the first heat accumulator section (9) is fixedly arranged on the straight section (4) close to the connecting section (3); the oxygen blowing gun port (11) and the water-cooled high-temperature resistant gate valve (12) are fixedly arranged on the water-cooled wall section (7) between the first heat accumulator section (9) and the connecting section (3).

4. The high-temperature flue gas evaporation cooling device according to claim 3, characterized in that: A water-cooled high-temperature valve (13) is fixedly arranged on the straight section (4) on the side of the first heat accumulator section (9) away from the oxygen blowing gun port (11) and the water-cooled high-temperature resistant gate valve (12), and is used to inject high-temperature flue gas into the vaporization cooling flue (2).

5. The high-temperature flue gas evaporation cooling device according to claim 4, characterized in that: The heat accumulator section comprises a plurality of smoke-passing cavities which are opened in the height direction of the heat accumulator section, and a heat-insulating layer (17) is wrapped around the outside of the heat accumulator section; The smoke-passing inner cavity is a cylindrical structure, comprising a first smoke-passing inner cavity (15) fixedly arranged at the center of the heat accumulator section and a plurality of circles of second smoke-passing inner cavities (16) radially arranged along the heat accumulator section, wherein the intervals between the second smoke-passing inner cavities (16) in each circle are the same, and within each circle of the second smoke-passing inner cavities (16), the intervals between adjacent second smoke-passing inner cavities (16) are the same, and the phase change heat storage material (30) is arranged in the gaps between the second smoke-passing inner cavities (16).

6. The high-temperature flue gas evaporation cooling device according to claim 4, characterized in that: The heat accumulator section comprises a plurality of smoke-passing cavities which are opened in the height direction of the heat accumulator section, and a heat-insulating layer (17) is wrapped around the outside of the heat accumulator section; The smoke-passing inner cavity comprises a first smoke-passing inner cavity (15) located at the center of the heat storage section and a plurality of circles of second smoke-passing inner cavities (16) radially arranged around the first smoke-passing inner cavity (15); the first smoke-passing inner cavity (15) is a cylindrical hole; the plurality of circles of the second smoke-passing inner cavities (16) are split based on the center of the first smoke-passing inner cavity (15); the central angles of the single second smoke-passing inner cavities (16) in each circle are the same; and a phase-change heat storage material (30) is arranged on the outer edge surface of the second smoke-passing inner cavity (16).

7. The high-temperature flue gas evaporation cooling device according to claim 1, characterized in that: The water-cooled wall section (7) comprises a water-cooled wall body and a plurality of water-cooled pipes (8) arranged based on the water-cooled wall body.

8. The high-temperature flue gas evaporation cooling device according to claim 2, characterized in that: The curved section (5) is composed of odd-numbered water-cooled wall sections (7) connected end to end, and a high-temperature resistant spring self-resetting explosion relief device (14) is also provided on the curved section (5).

9. The high-temperature flue gas evaporation cooling device according to claim 1, characterized in that: The vaporization cooling flue (2) is connected to the output end of the converter (1) via a movable smoke hood and a hood skirt (6).

10. A method for evaporation cooling of high temperature flue gas, characterized in that: The high-temperature flue gas vaporization cooling device as described in any one of claims 1 to 9 is used to provide heat storage conditions for the vaporization cooling flue (2), while reducing the intake of cold air and inputting hot air into the vaporization cooling flue (2) to adjust the flue gas temperature passing through the vaporization cooling flue (2).

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