Full-dry-method sensible heat recovery device for converter gas OG method transformation

Abstract

The utility model discloses a full-dry-method sensible heat recovery device for converter gas OG method transformation. The full-dry-method sensible heat recovery device comprises a converter, an evaporation cooling flue, a gas cooler and a switching station. The inlet end of the evaporative cooling flue is connected with an outlet of the converter, an outlet of the evaporative cooling flue is connected with an inlet of the gas cooler, and a smoke outlet is formed in the position, close to the bottom, of the gas cooler and connected with an inlet of the switching station. Compared with a traditional boiler heat exchanger, the gas cooler is adopted, a forced convection efficient heat exchange mode is adopted, the temperature gradient isothermal body design is optimized, the heat efficiency is improved, meanwhile, the temperature of equipment does not change drastically, meanwhile, the equipment structure is reduced, and a transformation project can be conveniently installed in a converter workshop. According to the whole technological process, water is not sprayed to the converter gas, the converter gas is always kept dry, and compared with a traditional water spraying cooling mode, water resources are greatly saved, environmental pollution is reduced, heat is recycled, waste of gas heat is avoided, and the heat value of the gas is increased.

Description

Technical Field

[0001] The utility model belongs to the field of converter gas treatment, and relates to a full dry sensible heat recovery device for the transformation of the converter gas OG method. Background Art

[0002] The existing mature treatment method for converter gas is the OG method. The OG method (Oxygen Gas Recovery System) is a traditional converter gas recovery method jointly developed by Nippon Steel and Kawasaki Corporation in Japan in the 1960s. Currently, about 90% of the converters in the world use the OG method. The OG method belongs to the full wet dust removal and purification of converter flue gas and gas recovery. The flue gas volume is controlled by the micro differential pressure at the furnace mouth. The hood and skirt are equipped with a high-temperature hot water closed-loop cooling system, and the flue is cooled by vaporization. In the entire dust removal system, the water spraying method is used to achieve the purpose of flue gas cooling and dust removal. The biggest disadvantage of this method is high energy consumption, large water consumption, complex sewage treatment, and high operating cost. Summary of the Utility Model

[0003] The purpose of the utility model is to overcome the above-mentioned disadvantages of the existing technology, and provide a full dry sensible heat recovery device for the transformation of the converter gas OG method, which greatly saves water resources, reduces environmental pollution, recovers heat, avoids waste of gas heat, and improves the calorific value of gas.

[0004] To achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A full dry sensible heat recovery device for the transformation of the converter gas OG method includes a converter, a vaporization cooling flue, a gas cooler, and a switching station;

[0006] The inlet end of the vaporization cooling flue is connected to the outlet of the converter, the outlet of the vaporization cooling flue is connected to the inlet of the gas cooler, a flue gas outlet is arranged near the bottom of the gas cooler, and the flue gas outlet is connected to the inlet of the switching station.

[0007] Preferably, a deaerated water inlet pipe and a steam outlet pipe are arranged on the gas cooler, the steam outlet pipe is connected to the inlet of the steam drum, and the outlet of the steam drum is connected to the pipe network.

[0008] Preferably, the cooling wall of the gas cooler adopts finned heat exchange tubes.

[0009] Preferably, an economizer is connected between the gas cooler and the switching station.

[0010] Preferably, the outlet of the switching station is divided into two paths, one path is connected to a gas storage cabinet, and the other path is connected to an automatic ignition and discharge chimney.

[0011] Preferably, a cyclone gas-solid separator is connected between the vaporization cooling flue and the gas cooler, and a metal membrane dry dust collector is connected between the gas cooler and the switching station.

[0012] Furthermore, the metal membrane dry dust collector adopts rigid high-temperature resistant metal membrane filter cartridges.

[0013] Furthermore, nitrogen-sealed ash discharge devices are provided at the upper bottoms of the cyclone gas-solid separator, the gas cooler, and the metal membrane dry dust collector.

[0014] Compared with the prior art, the present utility model has the following beneficial effects:

[0015] By adopting a gas cooler with efficient waste heat recovery, the present utility model, compared with the traditional boiler heat exchanger, uses a forced convection high-efficiency heat transfer mode, optimizes the temperature gradient isothermal body design, improves the thermal efficiency while keeping the equipment temperature from changing violently, and at the same time reduces the equipment structure, facilitating the installation of the renovation project in the converter workshop building. There is no water spraying on the converter gas throughout the entire process flow, and the converter gas always remains dry. Compared with the traditional form of water spraying for temperature reduction, it greatly saves water resources, reduces environmental pollution, recovers heat, avoids waste of gas heat, and improves the calorific value of the gas.

[0016] Furthermore, the gas cooler reduces the converter flue gas from about 1000 °C to about 200 °C, and saturated steam can be generated for utilization, improving the utilization efficiency of the waste heat of the converter gas.

[0017] Furthermore, the converter gas is further cooled to 70 °C in the economizer, and the economizer will recover this part of the low-temperature heat source.

[0018] Furthermore, when unqualified gas is generated, that is, when the oxygen content of the converter gas does not meet the standard, the switching valve in the switching station quickly switches, and the unqualified converter gas is introduced into the automatic ignition and discharge chimney, and the unqualified gas is burned and then discharged. When the generated gas is qualified, the switching station switches and introduces the gas into the gas storage cabinet.

[0019] Furthermore, by supporting the cyclone gas-solid separator and the metal membrane dry dust collector, and aiming at the characteristics of high temperature, high concentration, and large particle size of the dust in the previous stage, it is processed in two steps. Through a suitable dust removal process combination, on the premise of meeting ultra-low emissions, it can save more investment costs and operating costs.

[0020] Furthermore, the nitrogen-sealed ash discharge device ensures that air is effectively prevented from entering the system during ash discharge, fully suppressing explosion. Description of the Drawings

[0021] Figure 1 It is a structural schematic diagram of the all-dry sensible heat recovery device for the converter gas OG method transformation of the present utility model.

[0022] Wherein: 1-converter, 2-vaporization cooling flue, 3-three-way switching valve group, 4-cyclone gas-solid separator, 5-gas cooler, 6-drum, 7-dry metal membrane dust collector, 8-economizer, 9-fan unit, 10-switching station, 11-gas storage tank, 12-automatic ignition and venting chimney. Specific embodiments

[0023] The following describes in detail the embodiments of the present invention. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as limiting the present invention.

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a connection that can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, and can be the internal communication of two elements or the interaction relationship between two elements. The term "and / or" used herein includes any and all combinations of one or more of the related listed items. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The terms used in the description of the present invention in this specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0026] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0027] The disclosure below provides many different embodiments or examples for realizing different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described below. Of course, they are merely examples, and the purpose is not to limit the utility model. In addition, the utility model may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the utility model provides various specific examples of processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

[0028] like Figure 1 As shown, the utility model is a fully dry sensible heat recovery device for the conversion of converter gas OG method, which includes a converter 1, a vaporization cooling flue 2, a three-way switching valve group 3, a cyclone gas-solid separator 4, a gas cooler 5, a steam drum 6, a metal film dry dust collector 7, an economizer 8, a fan unit 9, a switching station 10, a gas storage cabinet 11 and an automatic ignition and dispersion chimney 12.

[0029] The top outlet of converter 1 produces converter gas at about 1450-1600°C, the inlet end of vaporization and cooling flue 2 is connected to the outlet of converter 1, the high-temperature converter gas first passes through vaporization and cooling flue 2 for heat exchange, and then cools down to 800-1000°C after passing through vaporization and cooling flue 2, the outlet of vaporization and cooling flue 2 is connected to three-way switching valve group 3, one end of three-way switching valve group 3 is connected to the original OG method equipment, and the other end is connected to cyclone gas-solid separator 4, to ensure that the original OG system can be used as a backup system, which can be switched at any time to ensure that the converter production is not interrupted. The vaporization and cooling flue 2 and converter 1 are the original system and are not included in the process of this utility model.

[0030] The cyclone gas-solid separator 4 is a high-temperature pre-dedusting device, adopting a cyclone structure. The function of the cyclone gas-solid separator 4 is to remove 70% of the coarse particles and dust in the converter gas by the inertia generated by centrifugal force, achieving primary dust removal and avoiding the erosion of the cooling wall of the subsequent gas cooler by these coarse particles and dust. At the bottom of the cyclone gas-solid separator 4, there is a nitrogen-sealed ash discharge device.

[0031] The cyclone gas-solid separator 4 adopts a vertical structure. A temporary ash bin and a nitrogen-sealed ash discharge valve are arranged at the lower part of the cyclone gas-solid separator 4 to timely clean the coarse particles and dust collected by the cyclone gas-solid separator 4.

[0032] The outlet of the cyclone gas-solid separator 4 is connected to the inlet of the gas cooler 5. The gas cooler 5 adopts a forced convection high-efficiency heat transfer mode and optimizes the temperature gradient isothermal body design. The converter gas enters from the top of the gas cooler 5 and is discharged from the lower part after heat transfer. The converter gas after heat transfer is at 150°C to 200°C. An oxygen-removing water inlet pipe and a steam outlet pipe are arranged on the gas cooler 5. The oxygen-removing water enters the internal heat exchange pipes of the gas cooler 5 through the oxygen-removing water inlet pipe, generates steam after heat transfer, and the steam outlet pipe is connected to the inlet of the steam drum 6. The outlet of the steam drum 6 is connected to the pipe network. The steam drum 6 converts the intermittently generated steam into stable and continuous low-pressure saturated steam and then transports it to the pipe network.

[0033] The cooling wall type of the gas cooler 5 is finned heat exchange tubes. Using the forced convection high-efficiency heat transfer mode and optimizing the temperature gradient isothermal body design, while improving the thermal efficiency, the temperature of the equipment does not change violently, reducing the influence of thermal stress and thermal alternating stress; the expansion amount is designed for the internal heat exchange tubes of the equipment, and there will be no leakage due to stress fatigue failure.

[0034] After the converter gas is heat-exchanged by the gas cooler 5, the flue gas temperature drops to ~200°C. A flue gas outlet is arranged near the bottom of the gas cooler 5. The flue gas outlet of the gas cooler 5 is connected to the inlet of the metal membrane dry dust collector 7. The converter gas at 150°C to 200°C undergoes secondary dust removal in the metal membrane dry dust collector 7, and the dust content of the converter gas after dust removal is less than 10mg / m 3 . The metal membrane dry dust collector 7 is a complete set of equipment, equipped with a complete set of dust removal, nitrogen-sealed ash discharge, venting, explosion relief, and switching valve devices.

[0035] The metal membrane dry dust collector 7 adopts a rigid high-temperature resistant metal membrane filter cartridge, with a temperature resistance of 450°C, fully adapting to the 200°C working condition and the occasional 300°C over-temperature condition. The dust content at the outlet of the metal membrane dry dust collector 7 is less than 10mg / m 3 . The metal membrane dry dust collector 7 is a complete set of equipment, equipped with complete ash discharge equipment, inlet and outlet valves, venting devices, and nitrogen systems.

[0036] The cyclone gas-solid separator 4, the gas cooler 5, and the bottom of the dry metal membrane dust collector 7 are all provided with nitrogen-sealed ash discharge devices to effectively prevent air from entering the system during ash discharge and fully suppress explosion.

[0037] The outlet of the dry metal membrane dust collector 7 is connected to the economizer 8. The converter gas is further cooled to 70°C in the economizer 8, and the economizer 8 will recover this part of the low-temperature heat source. The outlet of the economizer 8 is connected to the fan unit 9. The fan is frequency-controlled to adapt to the production process of the converter 1 and save energy and reduce consumption. A switching station 10 is provided at the outlet end of the fan unit 9. The outlet end of the switching station 10 is divided into two paths. One path leads to the gas storage cabinet 11, and the other path leads to the automatic ignition and flaring chimney 12. When unqualified gas is generated, that is, when the oxygen content of the converter gas does not meet the standard, the switching valve in the switching station 10 quickly switches, and the unqualified converter gas is introduced into the automatic ignition and flaring chimney 12, and the unqualified gas is burned and then discharged. When the generated gas is qualified, the switching station 10 switches and introduces the gas into the gas storage cabinet 11. The automatic ignition and flaring chimney 12 includes equipment such as an igniter, a combustion-supporting fan, a low-nitrogen burner, and a chimney body.

[0038] An anti-leakage switching valve group is installed in the switching station 10 to ensure that gas does not leak during switching.

[0039] The utility model adopts the full dry waste heat recovery technology, which greatly increases the saturated steam volume of the converter, improves the calorific value of the gas, reduces the volume of the gas, optimizes the gas quality, and the original primary dust removal (OG) is no longer used, thus saving a large amount of water resources, saving a large amount of electricity for the fan and the water pump, fully meeting the national -30 kgce benchmark level of the converter process, and the converter gas dust removal and flaring port reaches ultra-low emission. At the same time, it solves the problems of the explosiveness, high dust content, and intermittency of the converter gas, and ensures the stable and continuous heat recovery process.

[0040] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0041] It should be understood that the above description is for illustrative purposes and not for limitation. By reading the above description, many embodiments and many applications other than the provided examples will be obvious to those skilled in the art. Therefore, the scope of the present teachings should not be determined with reference to the above description, but rather should be determined with reference to the full scope of the foregoing claims and the equivalents of those claims. For the sake of completeness, all articles and references including the disclosures of patent applications and publications are incorporated herein by reference. Omission of any aspect of the subject matter disclosed herein from the foregoing claims is not intended to abandon such subject matter, nor should it be considered that the applicant has not considered such subject matter to be part of the disclosed utility model subject matter.

Claims

1. A fully dry sensible heat recovery device for the transformation of the converter gas OG method, characterized in that, It includes a converter (1), a vaporization cooling flue (2), a gas cooler (5) and a switching station (10); The inlet end of the vaporization cooling flue (2) is connected to the outlet of the converter (1), the outlet of the vaporization cooling flue (2) is connected to the inlet of the gas cooler (5), a flue gas outlet is arranged near the bottom of the gas cooler (5), and the flue gas outlet is connected to the inlet of the switching station (10).

2. The total dry sensible heat recovery device for the modification of the converter gas OG method according to claim 1, characterized in that An oxygen-removing water inlet pipe and a steam outlet pipe are arranged on the gas cooler (5), the steam outlet pipe is connected to the inlet of a steam drum (6), and the outlet of the steam drum (6) is connected to a pipe network.

3. The total dry sensible heat recovery device for the converter gas OG method transformation according to claim 1, characterized in that, The cooling wall of the gas cooler (5) adopts finned heat exchange tubes.

4. The total dry sensible heat recovery device for the converter gas OG process transformation according to claim 1, characterized in that A economizer (8) is connected between the gas cooler (5) and the switching station (10).

5. The total dry sensible heat recovery device for the converter gas OG method transformation according to claim 1, wherein The outlet of the switching station (10) is divided into two paths, one path is connected to a gas storage tank (11), and the other path is connected to an automatic ignition and discharge chimney (12).

6. The total dry sensible heat recovery device for the converter gas OG method transformation according to claim 1, wherein, A cyclone gas-solid separator (4) is connected between the vaporization cooling flue (2) and the gas cooler (5), and a metal membrane dry dust collector (7) is connected between the gas cooler (5) and the switching station (10).

7. The total dry sensible heat recovery device for the converter gas OG method transformation according to claim 6, wherein The metal membrane dry dust collector (7) adopts rigid high-temperature resistant metal membrane filter cartridges.

8. The total dry method sensible heat recovery device for the converter gas OG method transformation according to claim 6, wherein, Nitrogen-sealed ash discharge devices are arranged at the bottoms of the cyclone gas-solid separator (4), the gas cooler (5) and the metal membrane dry dust collector (7).

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