WO2021018030A1 - Dispositif de post-traitement de gaz de convertisseur et de récupération de chaleur perdue - Google Patents

Dispositif de post-traitement de gaz de convertisseur et de récupération de chaleur perdue Download PDF

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Publication number
WO2021018030A1
WO2021018030A1 PCT/CN2020/104082 CN2020104082W WO2021018030A1 WO 2021018030 A1 WO2021018030 A1 WO 2021018030A1 CN 2020104082 W CN2020104082 W CN 2020104082W WO 2021018030 A1 WO2021018030 A1 WO 2021018030A1
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Prior art keywords
module
sub
furnace gas
converter
steam
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PCT/CN2020/104082
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English (en)
Chinese (zh)
Inventor
魏小林
李博
李森
李腾
姚远
宾峰
潘利生
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中国科学院力学研究所
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Publication of WO2021018030A1 publication Critical patent/WO2021018030A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/38—Removal of waste gases or dust
    • C21C5/40—Offtakes or separating apparatus for converter waste gases or dust
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/004—Systems for reclaiming waste heat
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C2100/00—Exhaust gas
    • C21C2100/02—Treatment of the exhaust gas
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C2100/00—Exhaust gas
    • C21C2100/06—Energy from waste gas used in other processes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Definitions

  • the embodiment of the present invention relates to the technical field of converter gas for steel smelting, in particular to a converter gas post-processing and waste heat recovery device
  • the iron and steel industry is a basic industry of the national economy. At present, due to problems in production technology and management, the energy consumption of the domestic iron and steel industry is far from the international advanced level, and the high-temperature furnace gas generated in the converter steelmaking process is recycled. The large amount of waste heat and energy, and reducing the emission of pollutants in the furnace gas are of great significance to energy conservation and emission reduction in the steel industry.
  • the converter gas is flammable and explosive (high carbon monoxide content and coexistence with oxygen), intermittent, fluctuating (temperature up to 1650 °C, flow rate, component concentration changes), wide range of heat flow, large dust content ( The characteristics of 20kg/t steel), high temperature (>1000°C), and large amount of instantaneous gas have brought challenges and difficulties to the efficient and stable recovery and utilization of furnace gas sensible heat.
  • embodiments of the present invention provide a converter furnace gas post-processing and waste heat recovery device.
  • an embodiment of the present invention provides a converter furnace gas post-processing and waste heat recovery device.
  • the device includes: a converter module, a fume hood module, a heat exchange module, a furnace gas treatment module, a furnace gas recovery module, and exhaust Module, explosion-proof module, control module;
  • the converter module, the fume hood module, the heat exchange module, and the furnace gas treatment module are connected in sequence, and the furnace gas treatment module is connected to the furnace gas recovery module and the exhaust module, respectively.
  • the explosion-proof module is respectively connected to the converter module, the fume hood module, the heat exchange module, the furnace gas treatment module, the furnace gas recovery module, and the exhaust module
  • the control module is respectively connected to the Converter module, the fume hood module, the heat exchange module, the furnace gas treatment module, the furnace gas recovery module, and the exhaust module;
  • the heat exchange module is used to recover the waste heat in the converter gas post-processing and waste heat recovery device
  • the furnace gas treatment module is used to purify the converter furnace gas in the converter module and recycle the particulate matter in the converter module;
  • the furnace gas recovery module is used to recover, store and reuse the converter furnace gas in the converter module
  • the exhaust module is used to smoothly discharge the converter furnace gas in the converter module
  • the explosion-proof module is used for safety protection during overpressure or explosion
  • the control module is used for operation monitoring, adjustment and data processing of the converter gas post-processing and waste heat recovery device.
  • the heat exchange module includes: a vaporization cooling flue sub-module, a thermal storage constant temperature sub-module, a high-performance heat exchanger sub-module, a water/steam cycle sub-module, and a steam post-processing sub-module.
  • the furnace gas treatment module includes: a dust removal submodule and a deacidification submodule.
  • the furnace gas recovery module includes: a furnace gas cabinet submodule, a venting furnace gas catalytic combustion heat exchange chamber submodule, and the exhaust module includes: a primary fan submodule , Three-way valve sub-module, release tower sub-module;
  • the three-way valve sub-module, the furnace gas cabinet sub-module, the venting furnace gas catalytic combustion heat exchange chamber sub-module, the deacidification sub-module, and the venting tower sub-module are connected in sequence, wherein the three-way valve
  • the sub-modules are respectively connected with the primary fan sub-module, connected with the furnace gas cabinet sub-module, and sequentially connected with the dispersing furnace gas catalytic combustion heat exchange chamber sub-module, the deacidification sub-module, and the dispersing tower sub-module.
  • the water/steam cycle sub-module includes: a steam drum unit, a steam accumulator unit, a condensation unit, a condensate tank unit, a condensate pump unit, and a variable frequency pump unit;
  • variable frequency pump unit The inlet of the variable frequency pump unit is set at the bottom of the steam drum unit to prevent cavitation, and the steam outlet is placed on the top of the steam drum unit to prevent excessive steam humidity from affecting subsequent normal operations;
  • the inlet of the steam drum unit is connected to the thermal storage constant temperature sub-module, the high-performance heat exchanger sub-module, and the radiator gas catalytic combustion heat exchange chamber sub-module;
  • variable frequency pump unit The outlet of the variable frequency pump unit is connected to the vaporization cooling flue sub-module, the high-performance heat exchanger sub-module, and the radiator gas catalytic combustion heat exchange chamber sub-module.
  • the thermal storage constant temperature submodule is composed of porous thermal storage bricks.
  • the high-performance heat exchanger submodule includes: a multi-stage combined fire tube heat exchanger.
  • the dust removal sub-module includes at least one of the following: a high-temperature metal bag filter, a ceramic pipe network type dust collector, a cyclone dust collector, an electric dust removal, and a bag dust removal.
  • thermal storage constant temperature sub-module can be added between the thermal storage constant temperature sub-module and the high-performance heat exchanger sub-module: high temperature metal bag filter, ceramic pipe network type dust collector, cyclone dust collector;
  • the deacidification sub-module includes: a desulfurization unit, a denitrification unit, and a dechlorination unit, and is arranged between the gas catalytic combustion heat exchange chamber sub-module of the exhaust furnace gas and the exhaust tower sub-module .
  • the steam post-processing sub-module adopts a Lafar nozzle to increase the temperature and pressure of the steam, or generate steam with adjustable temperature and pressure by heating.
  • Figure 1 is a schematic structural diagram of a converter gas post-processing and waste heat recovery device according to an embodiment of the present invention
  • Fig. 2 is a schematic diagram of the overall structure of a converter gas post-treatment and waste heat recovery device according to an embodiment of the present invention.
  • FIG. 1 it is a schematic structural diagram of a converter gas post-treatment and waste heat recovery device provided by an embodiment of the present invention (part of the connection is not shown).
  • the device may include: converter module 1, fume hood module 2, Heat exchange module 3, furnace gas treatment module 4, furnace gas recovery module 5, exhaust module 6, explosion-proof module 7, control module 8.
  • the heat exchange module 3 it is used to recover the waste heat in the converter gas after-treatment and waste heat recovery device, that is, recover the waste heat of the system, and improve the energy utilization rate of the device;
  • furnace gas treatment module 4 purifying the converter furnace gas in the converter module and recycling the particulate matter in the converter module;
  • furnace gas recovery module 5 it is used to recover, store and reuse the converter furnace gas in the converter module;
  • the exhaust module 6 it is used to smoothly discharge the converter furnace gas in the converter module
  • the explosion-proof module 7 it is used for the safety protection of the converter gas post-treatment and waste heat recovery device when overpressure or explosion, that is, the safety protection of the device when the system is overpressure or explosion;
  • the control module 8 is used for the operation monitoring, adjustment and data processing of the converter gas post-processing and waste heat recovery device.
  • the converter gas post-treatment and waste heat recovery device in the embodiment of the present invention is designed with a slight negative pressure, -10 to 0 mm water column.
  • heat exchange module 3 it may include: vaporization cooling flue sub-module 31, thermal storage constant temperature sub-module 32, high-performance heat exchanger sub-module 33, water/steam cycle sub-module 34, steam post-processing sub-module 35 (respectively Corresponding to the vaporization cooling flue 31, the thermal storage thermostat 32, the high-performance heat exchanger 33, the water/steam cycle 34, and the steam post-processing device 35 shown in FIG. 2).
  • the sensible heat utilization rate of converter gas is ⁇ 80%.
  • the vaporization cooling flue sub-module 31 includes: flue, refractory material, water wall, heat preservation material, and radiation protection material.
  • the water wall can be placed outside the refractory material, semi-inlaid in the refractory material, or placed inside the refractory material.
  • the form can be a casing type water wall, or multiple pipes are distributed symmetrically in sequence.
  • the furnace gas temperature of 1200 ⁇ 1700°C can be reduced to 850 ⁇ 1000°C.
  • the thermal storage constant temperature sub-module 32 is arranged after the vaporization cooling flue sub-module 31 and used in combination with the high-performance heat exchanger sub-module 33.
  • the use of porous heat storage bricks can reduce the temperature of the furnace gas at 850-1000°C to 550-650°C, and raise the ambient air temperature to 550-650°C to achieve the furnace gas temperature entering the high-performance heat exchanger submodule 33 Maintain stability. It solves the problems of discontinuous converter gas, large fluctuations, large changes in temperature and heat flow density, resulting in large heating fluctuations, and low heat exchange efficiency of ordinary heat exchangers, which is beneficial to reducing converter operating energy consumption. It can also realize step preheating of working gas (oxygen, nitrogen, etc.) and materials (hot metal, scrap steel, batch materials, etc.).
  • the high-performance heat exchanger sub-module 33 includes a multi-stage combined fire tube heat exchanger.
  • the high-performance heat exchanger sub-module 33 realizes the furnace by designing the inlet/outlet water pressure (0.1-3MPa), temperature (105-410°C) and saturation (unsaturated water, saturated water, steam with different dryness, etc.) Multi-stage utilization of air temperature.
  • the temperature span is large, and the furnace gas temperature of 550-650°C can be reduced to 100-200°C. It has good adaptability and can adapt to the requirements of different temperature spans and pressures.
  • the working parameters of the inlet and outlet working fluid of the multi-stage combined fire tube heat exchanger are controllable and adjustable. Design the number of stages and the type of heat exchanger according to the temperature span requirements and working fluid requirements. It can realize waste heat power generation, generate adjustable superheated steam and hot water with various pressures and temperatures, for production and life use, and provide energy utilization. It is suitable for the characteristics of converter gas intermittent, instantaneous high temperature, instantaneous heat flux density, and instantaneous gas volume.
  • a Raphael nozzle is used to increase the temperature and pressure of the steam, so that the wet saturated steam can be turned into a slightly superheated steam with a low superheat of 0-10°C; or a heating method can be used to generate temperature and pressure.
  • Tuned steam It can realize the stable output of steam pressure and temperature, solve the problems of large heating fluctuations caused by the intermittent operation of the converter, low steam pressure and temperature generated, and inability to meet the grid connection requirements. It can improve the quality of recovered energy and reduce the impact The impact of the steam network.
  • For the water/steam cycle sub-module 34 it includes: steam drum unit 341, steam heat accumulator unit 342, condensation unit 343 (corresponding to the condensation device 343 shown in Figure 2), condensate tank unit 344, condensate pump unit 345, frequency conversion Pump unit 346, and 10-1000mm pipes between each unit.
  • condensation unit 343 corresponding to the condensation device 343 shown in Figure 2
  • condensate tank unit 344 condensate pump unit 345
  • frequency conversion Pump unit 346 frequency conversion Pump unit 346
  • 10-1000mm pipes between each unit.
  • the forced circulation is easy to control; the system layout is relatively free, and it can use some structures that cannot be adopted by the natural circulation; it can increase the flow driving force of the working fluid to form a control loop, and the circulation pressure head is significantly higher than that in the natural circulation, and it can be more freely Arrange the evaporation surface of the water wall; the circulation magnification is about 3-10.
  • the water/steam in different states absorb heat through the heat exchange module, and the physical state changes such as heating, evaporation or overheating, the steam and hot water produced can be used for production and life.
  • the pump can provide power for circulating water.
  • the water inlet of the variable frequency pump is set at the bottom of the steam drum to prevent cavitation.
  • the steam outlet is placed on the top of the steam drum to prevent excessive humidity from affecting subsequent normal operation.
  • the steam drum unit 341 it is the connection hub of the three processes of working fluid heating, evaporation, and overheating to ensure the normal water circulation of the boiler; there is a steam water ion unit and a continuous blowdown subunit inside to ensure the boiler steam quality; there is a certain amount of water and a certain amount of storage. Thermal capacity, to ease the rate of change of steam pressure; the steam drum unit 341 is equipped with pressure gauges, water level gauges, accidental water discharge, safety valves and other equipment to ensure the safe operation of the boiler.
  • a pressure swing type heat accumulator may be included.
  • the excess steam enters the heat accumulator to heat the stored water (saturated water), the steam itself is condensed in it, and the pressure in the heat accumulator rises accordingly.
  • the amount of steam used is greater than the boiler's evaporation capacity, the stored water (saturated water) in the heat accumulator will boil due to pressure drop, providing steam to keep the boiler load constant. It can prevent the boiler steam pressure and water level from fluctuating up and down caused by the large fluctuation of steam consumption in the steam supply system of industrial boilers, the boiler operation is difficult, and the boiler combustion efficiency is reduced.
  • the condensate tank unit 344 is used to store the circulating water recovered by the condensing unit 343.
  • variable frequency pump unit 346 The inlet of the variable frequency pump unit 346 is set at the bottom of the steam drum unit 341 to prevent cavitation, and the steam outlet is placed on the top of the steam drum unit 341 to prevent excessive humidity from affecting subsequent normal operation.
  • Condensation is provided after condensing unit 343
  • the water tank unit 344 is provided with a condensate pump unit 345 between the condensate tank unit 344 and the steam drum unit 341, a steam heat accumulator unit 342 is provided after the steam drum unit 341, and a steam post-processing unit is provided after the steam heat accumulator unit 342.
  • the module 35 and the condensation unit 343 are provided with a condensation unit 343 after the steam post-processing sub-module 35, as shown in FIG. 2.
  • the water outlet of the steam accumulator unit 342 can also be connected between the condensate pump unit 345 and the steam drum unit 341, as shown in FIG. 2.
  • the furnace gas treatment module 4 includes: a dust removal submodule 41 and a deacidification submodule 42.
  • the dust removal sub-module 41 can agglomerate small particles in the furnace gas, remove large and small particles in the furnace gas, and recycle them according to the specific composition.
  • the deacidification submodule 42 is used to remove acidic substances in the furnace gas , So that the furnace gas emission standards.
  • a cloth bag is usually used to remove dust.
  • a high-temperature metal bag filter, ceramic pipe-net type dust collector, or cyclone dust collector can be used for coarse dust removal.
  • low temperatures such as after the high-performance heat exchanger sub-module 33, you can Use electric dust removal and bag dust removal for fine dust removal. The dust removal effect is good, and it is convenient for dust collection and recycling.
  • the deacidification sub-module 42 includes: a desulfurization unit 421, a denitrification unit 422, and a dechlorination unit 423 (respectively corresponding to the desulfurization unit 421, denitrification unit 422, and dechlorination unit 423 shown in FIG. 2), which are arranged in the 63 between the dispersing furnace gas catalytic combustion heat exchange chamber sub-module 52 and the dispersing tower sub-module. Because the steelmaking raw materials contain a small amount of sulfur, the sulfur oxides produced after the reaction are discharged with the furnace gas.
  • the desulfurization unit 421 can remove sulfur oxides from the furnace gas and reduce the corrosion of the device; the nitrogen in the air will be combined with oxygen at high temperatures.
  • the reaction may generate nitrogen oxides and discharge with the furnace gas.
  • the denitrification unit 422 can remove the nitrogen oxides in the furnace gas to realize the nitrogen oxide emission of the furnace gas ⁇ 50mg/Nm 3 ; the dechlorination unit 423 can remove the nitrogen oxides in the furnace gas. chlorine.
  • the furnace gas can be purified to avoid environmental pollution such as acid rain and photochemical smog.
  • the deacidification sub-module 42 adopts atomizing nozzles, which can increase the contact area of the gas phase reaction. A certain number and special arrangement (continuous arrangement, staggered arrangement, etc.) can be designed to increase the efficiency of acid removal by 3 ⁇ 5%.
  • the furnace gas recovery module 5 includes: a furnace gas cabinet sub-module 51 and a dissipated furnace gas catalytic combustion heat exchange chamber sub-module 52.
  • the effective coal gas with carbon monoxide content> 35% and oxygen content ⁇ 1% will be sent to the furnace gas cabinet module 51 for recovery and storage, and post-processing and reuse.
  • the vented gas will be sent to the venting furnace gas catalytic combustion heat exchange chamber sub-module 52, after removing excess carbon monoxide in the furnace gas, it will be discharged through the venting tower sub-module 63.
  • the combination of three-way and valve is used to control the direction of the furnace gas. Among them, the use of metal hard-sealed butterfly valves can improve the tightness of the pipeline and improve the purity of the furnace gas.
  • the sub-module 52 of the heat exchange chamber for catalytic combustion of the venting furnace gas includes: a combustion chamber, a catalyst, a carrier, and a heat exchanger.
  • the residence time of the combustion chamber is designed to be more than 10s to ensure full catalytic combustion and carbon monoxide emission concentration ⁇ 1%.
  • Heat exchange pipes are arranged around the combustion chamber, which can be designed as shell-and-tube heat exchangers or water-cooled walls, which are used to dissipate the chemical heat of coal gas.
  • the heat released by catalytic combustion maintains the temperature required for the catalytic reaction on the one hand, and heats or overheats on the other Circulating cooling water/steam can realize the heat utilization rate of the released gas>60%.
  • the exhaust module 6 includes: a primary fan sub-module 61, a three-way valve sub-module 62, and a dispersing tower sub-module 63.
  • the selection of the inducer fan can be an axial fan, which can smoothly relieve the pressure when the system suddenly burns, and protect the system from damage.
  • the fan adopts frequency conversion speed regulation method, which can realize variable flow tracking adjustment, which not only guarantees the quantity and quality of gas recovery, but also has obvious energy saving effect.
  • the furnace gas recovery module uses a three-way valve to control the direction of the furnace gas. Among them, a combination of a three-way valve and a metal hard seal butterfly valve can improve the air tightness of the pipeline.
  • the sub-modules of the dispersing tower are sequentially connected 63, wherein the three-way valve sub-module 62 is respectively connected to the primary fan sub-module 61, connected to the furnace gas cabinet sub-module 51, and exchanges heat with the catalytic combustion of the dispersing furnace gas
  • the chamber submodule 52, the deacidification submodule 42, and the dispersing tower submodule 63 are connected in sequence, as shown in FIG. 2.
  • the inlet of the steam drum unit 341 is connected to the thermal storage constant temperature sub-module 32, the high-performance heat exchanger sub-module 33, and the radiator gas catalytic combustion heat exchange chamber sub-module 52, and the outlet of the variable frequency pump unit 246 Connected to the vaporization cooling flue sub-module 31, the high-performance heat exchanger sub-module 33, and the radiator gas catalytic combustion heat exchange chamber sub-module 52, as shown in FIG. 2.
  • thermal storage constant temperature sub-module 32 and the high-performance heat exchanger sub-module 33 can be added between the thermal storage constant temperature sub-module 32 and the high-performance heat exchanger sub-module 33: high temperature metal bag filter 411, ceramic pipe network type dust collector, cyclone A dust collector, between the high-performance heat exchanger sub-module 33 and the primary fan sub-module 61, an electric dust removal 412 and a bag dust removal 413 can be added, as shown in FIG. 2.
  • explosion-proof module 7 they are installed before and after the long straight pipe, the curved pipe and the important module. Multiple explosion-proof modules can be installed, and the installation safety requires selection of explosion-proof (venting) modules of various specifications and models.
  • the anti-explosion valve When the system is overpressure or exploded, the anti-explosion valve will automatically open and instantly relieve the pressure. When the system pressure is less than the safe setting value, the valve will automatically reset and seal, effectively preventing the pipeline from secondary tempering and explosion.
  • the control module 8 includes a converter control submodule, a fume hood control submodule, a heat exchange control submodule, a furnace gas treatment control submodule, a furnace gas recovery control submodule, an exhaust control submodule, and an explosion-proof control submodule. It can measure, monitor, control and record the operating parameter data of important modules to ensure the safe and efficient process of furnace gas recovery.
  • the heat exchange control sub-module it can measure, monitor, control and record the dryness, temperature, pressure, flow, flow rate and other data of the working fluids on both sides during the heat exchange process, and form feedback with each link of the heat exchange module to ensure heat exchange The process is carried out safely and efficiently.
  • the furnace gas treatment control sub-module it can measure, monitor, control and record the composition of the furnace gas pollutants (especially S, N, Cl), concentration, temperature, pressure, flow, flow rate and other data, and the furnace gas treatment module Feedback is formed in each link to ensure the safe and efficient process of furnace gas treatment.
  • the furnace gas pollutants especially S, N, Cl
  • concentration especially temperature, pressure, flow, flow rate and other data
  • the furnace gas treatment module Feedback is formed in each link to ensure the safe and efficient process of furnace gas treatment.
  • the furnace gas recovery control submodule it can measure, monitor, control and record the furnace gas composition (especially carbon monoxide, oxygen), concentration, temperature, pressure, flow, atmosphere and other data of the furnace gas recovery control submodule, and the furnace gas recovery
  • Each link of the control sub-module forms feedback.
  • the composition and concentration of the furnace gas the purpose of the furnace gas is judged, and the flow direction of the furnace gas is controlled by switching the valve.
  • the effective gas with carbon monoxide content> 35% and oxygen content ⁇ 1% is sent to the gas tank for recovery and storage, and the released gas will be sent to Vent the gas catalytic combustion chamber.
  • the concentration of carbon monoxide and oxygen it is judged whether it is near the explosion limit, and an early warning of carbon monoxide explosion is carried out. It solves the safety problems caused by the large fluctuations in the composition and concentration of the converter gas.
  • the converter gas post-treatment and waste heat recovery device provided by the embodiment of the present invention does not require fixed converters and the converter gas post-treatment and waste heat recovery devices correspond to one-to-one fixed equipment. Only a single set of equipment can meet multiple requirements. The applicability of the furnace gas treatment of the converter is greatly enhanced;
  • the converter gas post-treatment and waste heat recovery device provided by the embodiments of the present invention greatly improve the safety performance of the converter gas post-treatment and waste heat recovery device, and the explosion-proof device can meet the safety requirements of the converter gas in the main devices and pipelines ;
  • the heat exchange device is designed according to the special properties of the converter gas, which can meet the production requirements for stable recovery and output of converter gas waste heat, and improve the utilization efficiency of waste heat resources;
  • the converter furnace gas post-processing and waste heat recovery device provided by the embodiments of the present invention can greatly reduce the emission of pollutants through the dust removal submodule, the deacidification submodule, and the furnace gas treatment module;
  • the converter gas post-treatment and waste heat recovery device provided by the embodiments of the present invention can realize the measurement, monitoring, control and recording of the main modules of the converter gas post-treatment and waste heat recovery device through personnel manipulation or independent work.
  • the intelligence of the device is greatly improved, which can meet the post-processing and waste heat recovery of different types of converter gas, and improve the working efficiency of the device.
  • the furnace gas flow is as follows:
  • the converter gas enters the fume hood module from the converter module, and the fume hood is connected to the vaporization cooling flue sub-module.
  • the furnace gas is quenched in the vaporization cooling flue sub-module; enters the heat storage constant temperature sub-module to stabilize the temperature of the furnace gas at 600°C; enters high temperature Metal bag filter or ceramic pipe-net type dust collector for coarse dust removal, filtering large particles of furnace dust in the furnace gas; entering the high-performance heat exchanger sub-module for further cooling; entering electric dust removal and bag filter fine dust removal and filtering furnace gas
  • the primary fan sub-module provides power for the furnace gas; the three-way valve sub-module is connected to the furnace gas recovery module: the effective gas flows into the gas cabinet sub-module; the released gas enters the sub-module of the catalytic combustion heat exchange chamber of the released gas , Remove the carbon monoxide in the furnace gas, while reducing the temperature of the furnace gas after combustion; enter the deacidification module to remove sulfur, nitrogen and
  • Water/steam process the saturated water at the bottom of the steam drum unit is pumped by the variable frequency pump unit to the vaporization cooling flue sub-module, the high-performance heat exchanger sub-module, and the dispersing furnace gas catalytic combustion heat exchange chamber sub-module; the steam part is natural circulation;
  • the 1-2MPa steam from each outlet of the thermal constant temperature sub-module, high-performance heat exchanger sub-module and the sub-module of the venting furnace gas catalytic combustion heat exchange chamber enters the upper part of the steam drum unit; enters the steam accumulator unit, where saturated water flows into the steam drum In the unit, part of the dry steam is supplied to production and life, and part of it enters the steam post-processing sub-module, which is connected to the steam network and connected to the grid; enters the condensing unit and condenses into the condensate tank unit; and finally is pumped to the lower part of the steam drum unit by the condensate pump unit.
  • the steps of the method or algorithm described in combination with the embodiments disclosed in this document can be implemented by hardware, a software module executed by a processor, or a combination of the two.
  • the software module can be placed in random access memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disks, removable disks, CD-ROMs, or all in the technical field. Any other known storage medium.
  • the converter gas post-treatment and waste heat recovery device provided by the embodiment of the present invention realizes converter gas post-treatment and waste heat recovery, improves safety performance, reduces pollutant emissions, and improves waste heat resource utilization efficiency.

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Abstract

L'invention concerne un dispositif de post-traitement de gaz de convertisseur et de récupération de chaleur perdue qui comporte : un module de convertisseur (1), un module de hotte à fumée (2), un module d'échange de chaleur (3), un module de traitement de gaz de convertisseur (4), un module de récupération de gaz de convertisseur (5), un module d'échappement (6), un module anti-explosion (7) et un module de commande (8). Le module d'échange de chaleur (3) est utilisé pour récupérer la chaleur perdue dans le dispositif de post-traitement de gaz de convertisseur et de récupération de chaleur perdue ; le module de traitement de gaz de convertisseur (4) est utilisé pour purifier le gaz de convertisseur dans le module de convertisseur (1) et pour recycler la matière particulaire dans le module de convertisseur (1) ; le module de récupération de gaz de convertisseur (5) est utilisé pour récupérer, stocker et recycler le gaz de convertisseur dans le module de convertisseur (1) ; le module d'échappement (6) est utilisé pour évacuer de façon régulière le gaz de convertisseur dans le module de convertisseur (1) ; le module anti-explosion (7) est utilisé pour la protection de la sécurité en cas de pression excessive ou d'explosion ; le module de commande (8) est utilisé pour la surveillance, le réglage et le traitement des données du dispositif de post-traitement de gaz de convertisseur et de récupération de chaleur perdue.
PCT/CN2020/104082 2019-07-30 2020-07-24 Dispositif de post-traitement de gaz de convertisseur et de récupération de chaleur perdue WO2021018030A1 (fr)

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