WO2021018030A1

WO2021018030A1 - Converter gas aftertreatment and waste heat recovery device

Info

Publication number: WO2021018030A1
Application number: PCT/CN2020/104082
Authority: WO
Inventors: 魏小林; 李博; 李森; 李腾; 姚远; 宾峰; 潘利生
Original assignee: 中国科学院力学研究所
Priority date: 2019-07-30
Filing date: 2020-07-24
Publication date: 2021-02-04
Also published as: CN110331251B; CN110331251A

Abstract

Disclosed is a converter gas aftertreatment and waste heat recovery device, comprising: a converter module (1), a smoke hood module (2), a heat exchange module (3), a converter gas treatment module (4), a converter gas recovery module (5), an exhaust module (6), an anti-explosion module (7), and a control module (8), wherein the heat exchange module (3) is used for recovering waste heat in the converter gas aftertreatment and waste heat recovery device; the converter gas treatment module (4) is used for purifying converter gas in the converter module (1) and recycling particulate matter in the converter module (1); the converter gas recovery module (5) is used for recovering, storing and recycling the converter gas in the converter module (1); the exhaust module (6) is used for smoothly discharging the converter gas in the converter module (1); the anti-explosion module (7) is used for safety protection during excessive pressure or an explosion; and the control module (8) is used for operation monitoring, adjustment and data processing of the converter gas aftertreatment and waste heat recovery device.

Description

Device for post-processing and waste heat recovery of converter gas

Technical field

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

Background technique

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.

Because the converter gas is flammable and explosive (high carbon monoxide content and coexistence with oxygen), intermittent, fluctuating (temperature up to 1650 ℃, flow rate, component concentration changes), wide range of heat flow, large dust content ( The characteristics of 20kg/t steel), high temperature (>1000℃), and large amount of instantaneous gas have brought challenges and difficulties to the efficient and stable recovery and utilization of furnace gas sensible heat.

In the related art, conventional flue gas post-processing and waste heat recovery devices are not suitable for treating converter gas. On the one hand, conventional flue gas post-processing and waste heat recovery devices are used, which cannot cope with flammable and explosive gases, and poses huge safety hazards, and there is certain environmental pollution caused by the direct emission of radiated flue gas; on the other hand, the sensible heat of converter gas is used in cascades , Which can improve the utilization rate of resources and reduce the energy consumption of converter operation. Based on this, starting from the requirements of safety, resource utilization and harmless treatment of converter gas, there is an urgent need for a converter gas post-treatment and waste heat recovery device.

Summary of the invention

In view of this, in order to solve the above technical problems or part of the technical problems, embodiments of the present invention provide a converter furnace gas post-processing and waste heat recovery device.

In the first aspect, 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;

Wherein, 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, and 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.

In a possible implementation manner, 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 converter module, the fume hood module, the vaporization cooling flue submodule, the thermal storage constant temperature submodule, the high performance heat exchanger submodule, the dust removal submodule, the primary fan submodule, 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.

In a possible implementation, 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;

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;

Install a condensate tank unit after the condensing unit, install a condensate pump unit between the condensate tank unit and the steam drum unit, install a steam accumulator unit after the steam drum unit, and install a steam post-processing sub-module after the steam accumulator unit. And a condensing unit, which is provided after the steam post-processing sub-module.

In a possible implementation manner, 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;

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.

In a possible implementation, the thermal storage constant temperature submodule is composed of porous thermal storage bricks.

In a possible implementation manner, the high-performance heat exchanger submodule includes: a multi-stage combined fire tube heat exchanger.

In a possible implementation manner, 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.

In a possible implementation, one of the following 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;

Between the high-performance heat exchanger sub-module and the primary fan sub-module, electric dust removal and bag dust removal can be added.

In a possible embodiment, 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 .

In a possible implementation manner, 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.

Description of the drawings

In order to more clearly explain the technical solutions in the embodiments of this specification or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some of the embodiments described in the embodiments of this specification. For those of ordinary skill in the art, other drawings can be obtained from these drawings.

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.

Preferred embodiment of the invention

In order to make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of the embodiments of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

In order to facilitate the understanding of the embodiments of the present invention, specific embodiments will be further explained below in conjunction with the drawings, and the embodiments do not constitute a limitation to the embodiments of the present invention.

As shown in 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.

Regarding 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;

Regarding the furnace gas treatment module 4, purifying the converter furnace gas in the converter module and recycling the particulate matter in the converter module;

Regarding the furnace gas recovery module 5, it is used to recover, store and reuse the converter furnace gas in the converter module;

Regarding the exhaust module 6, it is used to smoothly discharge the converter furnace gas in the converter module;

Regarding 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.

In a specific embodiment, 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.

For the above 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). Through the cooperation of the vaporization cooling flue sub-module 31, the thermal storage constant temperature sub-module 32, the high-performance heat exchanger sub-module 33, and the water/steam circulation sub-module 34, waste heat power generation, steam and hot water generation, and preheating can be realized For gas and materials, 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℃ can be reduced to 850～1000℃.

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.).

For the high-performance heat exchanger sub-module 33, it 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℃) 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℃ can be reduced to 100-200℃. It has good adaptability and can adapt to the requirements of different temperature spans and pressures.

Wherein, 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.

For the steam post-processing sub-module 35, 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℃; 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. When the furnace gas temperature is 800-1600℃, natural circulation is adopted, and when the temperature is 200-800℃, natural circulation and forced circulation are combined. 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.

For 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.

As for the steam heat accumulator unit 342, a pressure swing type heat accumulator may be included. When the boiler evaporation is greater than the steam consumption, 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. When 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.

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.

For the connection relationship of the above-mentioned steam drum unit 341, steam accumulator unit 342, condensing unit 343, condensate tank unit 344, condensate pump unit 345, variable frequency pump unit 346, and steam post-processing sub-module 35: 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. Wherein, 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.

For the dust removal sub-module 41, considering the aggregation of small particles, a cloth bag is usually used to remove dust. At high temperatures, such as before the high-performance heat exchanger sub-module 33, a high-temperature metal bag filter, ceramic pipe-net type dust collector, or cyclone dust collector can be used for coarse dust removal. At 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.

Based on the above description, the converter module 1, the fume hood module 2, the vaporization cooling flue sub-module 31, the thermal storage constant temperature sub-module 32, the high-performance heat exchanger sub-module 33, the dust removal sub-module Module 41, the primary fan sub-module 61, the three-way valve sub-module 62, the furnace gas cabinet sub-module 51, the exhaust furnace gas catalytic combustion heat exchange chamber sub-module 52, the deacidification sub-module 42, 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.

In addition, one of the following 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.

For the 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. 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.

For 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.

For 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.

For 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. According to 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. According to 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.

Through the above description of the converter gas post-treatment and waste heat recovery device provided by the embodiment of the present invention:

1. 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;

2. 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 ；

3. In the converter gas post-processing and waste heat recovery device provided by the embodiments of the present invention, 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;

4. 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;

5. 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.

In the process of applying the converter gas post-treatment and waste heat recovery device provided by the embodiment of the present invention, 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 chlorine in the furnace gas; discharge through the sub-module of the dispersing tower.

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.

Professionals should also be further aware that the units and algorithm steps of the examples described in the embodiments disclosed in this article can be implemented by electronic hardware, computer software or a combination of both, in order to clearly illustrate the hardware and software Interchangeability. In the above description, the composition and steps of each example have been generally described in terms of function. Whether these functions are executed by hardware or software depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to realize the described functions, but such realization should not be considered as going beyond the scope of the present invention.

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 specific embodiments described above further describe the purpose, technical solutions and beneficial effects of the present invention in further detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the scope of the present invention. The scope of protection, any modification, equivalent replacement, improvement, etc., made within the spirit and principle of the present invention shall be included in the scope of protection of the present invention.

Industrial applicability

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.

Claims

A converter furnace gas post-processing and waste heat recovery device, characterized in that the device comprises: converter module, fume hood module, heat exchange module, furnace gas treatment module, furnace gas recovery module, exhaust module, explosion-proof module, control Module

Wherein, 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, and 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 device according to claim 1, wherein the heat exchange module comprises: 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 steam post-processing Sub-module, the furnace gas treatment module includes: a dust removal sub-module, a deacidification sub-module, the furnace gas recovery module includes: a furnace gas cabinet sub-module, a venting furnace gas catalytic combustion heat exchange chamber sub-module, the exhaust module includes : Primary fan sub-module, three-way valve sub-module, and dispersing tower sub-module;

The converter module, the fume hood module, the vaporization cooling flue submodule, the thermal storage constant temperature submodule, the high performance heat exchanger submodule, the dust removal submodule, the primary fan submodule, 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 device according to claim 2, wherein 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;

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;

Install a condensate tank unit after the condensing unit, install a condensate pump unit between the condensate tank unit and the steam drum unit, install a steam accumulator unit after the steam drum unit, and install a steam post-processing sub-module after the steam accumulator unit. And a condensing unit, which is provided after the steam post-processing sub-module.
The device according to claim 3, wherein 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 Module

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 device according to claim 2, wherein the thermal storage constant temperature sub-module is composed of porous thermal storage bricks.
The device according to claim 2, wherein the high-performance heat exchanger sub-module comprises: a multi-stage combined fire tube heat exchanger.
The device according to claim 2, wherein 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 collector, and a bag dust collector.
The device according to claim 7, wherein one of the following 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;

Between the high-performance heat exchanger sub-module and the primary fan sub-module, electric dust removal and bag dust removal can be added.
The device according to claim 2, wherein the deacidification sub-module comprises: a desulfurization unit, a denitrification unit and a dechlorination unit, which are arranged in the sub-module of the gas catalytic combustion heat exchange chamber of the dispersing furnace and the Disperse between the tower sub-modules.
The device according to claim 2, wherein 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.