CN112063793A - Primary pure dry dedusting system of converter integrating full waste heat recovery and stable fine purification - Google Patents
Primary pure dry dedusting system of converter integrating full waste heat recovery and stable fine purification Download PDFInfo
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- CN112063793A CN112063793A CN202010838614.2A CN202010838614A CN112063793A CN 112063793 A CN112063793 A CN 112063793A CN 202010838614 A CN202010838614 A CN 202010838614A CN 112063793 A CN112063793 A CN 112063793A
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- 238000011084 recovery Methods 0.000 title claims abstract description 170
- 239000002918 waste heat Substances 0.000 title claims abstract description 169
- 238000000746 purification Methods 0.000 title claims abstract description 31
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- 239000003546 flue gas Substances 0.000 claims abstract description 178
- 238000005338 heat storage Methods 0.000 claims abstract description 83
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- 239000007789 gas Substances 0.000 claims abstract description 71
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 65
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Classifications
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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
-
- 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
- F27D2017/006—Systems for reclaiming waste heat using a boiler
-
- 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
- F27D2017/007—Systems for reclaiming waste heat including regenerators
-
- 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
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention belongs to the field of energy conservation and environmental protection, and particularly relates to a converter primary pure dry dedusting system integrating full waste heat recovery and stable fine purification. The device comprises a vaporization cooling flue, a high-temperature phase change type heat storage device, a waste heat recovery system and an explosion-proof system. The converter gas is not directly contacted with water in the cooling process, the gas does not contain water, the CO loss is reduced, the gas recovery amount is large, the transportation and the use are facilitated, and the gas quality is high. The full waste heat recovery device is utilized to recover the waste heat of the converter flue gas to the maximum extent, and the steam is stably produced for power generation or production and use, so that the energy-saving benefit is obvious. Besides recovering heat and coal gas, various dusts are not mixed with water, so that the dust is easy to separate, recover and reuse, does not cause secondary pollution, and does not have wastewater treatment cost.
Description
Technical Field
The invention belongs to the field of energy conservation and environmental protection, and particularly relates to a converter primary pure dry dedusting system integrating full waste heat recovery and stable fine purification.
Background
In recent years, haze weather frequently appears in China, and the problem of air quality has attracted high attention of the whole society. The iron and steel industry, as a major consumer of industrial emissions, is increasingly subject to strict limits on emission standards and emissions.
The steel industry in China is in the period of structure adjustment and optimization upgrading, faces increasingly severe resource and environmental pressure, and has to go through resource-saving and environment-friendly sustainable development.
The converter steelmaking, which is the main steelmaking process of steel enterprises, generates gas containing carbon monoxide as a main component, a small amount of carbon dioxide and other trace components in the blowing process, and also carries a large amount of iron oxide, metal iron particles and other fine particle solid dust, thus seriously polluting the atmosphere and the workshop environment. Therefore, the technical level of the converter dust removal system is improved, and the recovery and utilization of converter gas and the recovery of flue gas waste heat have great significance for saving energy and reducing consumption in steelmaking, effectively controlling and reducing the emission of steelmaking atmospheric pollutants and reducing environmental pollution.
The temperature of the converter flue gas outlet is about 1400-1600 ℃, and the dust concentration is 70-200 g/m3After leaving the furnace mouth, the gas is cooled to 800-1000 ℃ by a vaporization cooling flue or a water cooling flue, and then enters a flue gas dust removal system to reduce the dust concentration so as to meet the national emission standard and the requirements of gas users. At present, the domestic converter primary flue gas dust removal process mainly comprises the traditional OG method, the new OG method, the semi-dry method, the dry method (LT method) and other dust removal processes.
At present, no matter which process system is adopted for primary flue gas purification of the converter, the common characteristics of the process systems are that the cooling of high-temperature flue gas is realized, the cooling of the flue gas is realized by absorbing latent heat of vaporization through evaporation of water, and a large amount of steam is consumed for dry (LT) dedusting because of the requirements of the system. Cooling the flue gas by consuming water is an efficient cooling method, but a very energy consuming method. Since the high-temperature flue gas from the evaporative cooling flue is a high-grade heat energy, not only the heat energy carried by the high-temperature flue gas is not recovered, but also a large amount of other energy sources are consumed to cool the high-temperature flue gas, which causes a large amount of energy waste and is also a main reason for forming smoke plume. For example, under the general design condition, the temperature of the flue gas discharged from the vaporization flue is 800-1000 ℃, and if the temperature of the flue gas is simply reduced to 500 ℃, steam generated by ton steel can reach 20kg, and huge benefit can be generated.
The dry dedusting always has high danger of gas explosion, and the electrostatic deduster cannot avoid the problem of high-voltage flashover of an electric field, so that the explosion venting problem of the electrostatic deduster is caused. In the actual production and operation process of the converter primary flue gas dry electrostatic dust removal system, due to the frequent occurrence of the explosion unloading problem and the smoke generation problem, the converter primary flue gas dry electrostatic dust removal system can not always ensure the stable standard of the flue gas emission. Meanwhile, the explosion venting of the electrostatic dust collector also causes secondary pollution of an operation post.
Because the flue gas is cooled by spraying water and steam, the flue gas contains a large amount of moisture, and the flue gas pipeline, the polar plate and the shell of the electrostatic dust collector, the gas pipeline and the gas recovery equipment are corroded.
Because oxygen blowing smelting is not continuous in the converter steelmaking process, the vaporization cooling flue and the waste heat recovery device of the converter primary dedusting system are always in the working state of heating and cooling alternate circulation, so that the alternating thermal stress of the vaporization cooling flue and the waste heat recovery device is very large. The vaporization cooling flue and the waste heat recovery device have short service life and large daily maintenance and repair workload under the action of alternating thermal stress, and also have great influence on converter steelmaking production to a certain extent.
Explosion venting devices arranged in the existing converter primary dust removal system are all directly communicated with the atmosphere, and secondary pollution to the operation post environment to a certain extent can be caused when the system is subjected to explosion venting.
Disclosure of Invention
The invention aims to provide a converter primary pure dry dedusting system which integrates full waste heat recovery and stable fine purification.
The converter primary pure dry dedusting system integrating full waste heat recovery and stable fine purification comprises a vaporization cooling flue, a high-temperature phase change type heat storage device, a waste heat recovery system and an explosion-proof system,
wherein,
the high-temperature phase-change type heat storage device comprises a circular shell and an ash bucket, wherein the shell comprises an upper box body and a middle box body, a high-temperature phase-change heat storage core is arranged in the middle box body, the upper box body is positioned at the upper part of the middle box body, which is provided with the high-temperature phase-change heat storage core, and the ash bucket is positioned below the middle box body;
the upper box body is provided with a high-temperature flue gas outlet, the middle box body or the ash bucket is provided with a high-temperature flue gas inlet, the high-temperature flue gas inlet is provided with a primary cyclone separation/airflow uniform distribution device, and the high-temperature flue gas inlet is accessed along the tangential direction of the circular shell;
uniformly distributed air flow cavities are formed in the straight section of the pipe wall at the lower part of the dust-containing flue gas primary cyclone separation/air flow uniform distribution device;
the lower part of the ash bucket is provided with a dust-removing pneumatic conveying transmitter device;
the high-temperature phase change heat storage core is a honeycomb tube bundle, and gaps between the high-temperature phase change heat storage core and the middle box body are high-temperature flue gas flowing channels;
a gas shock wave soot blower is arranged in the upper box body and used for blowing and cleaning high-temperature flue gas flowing through the wall of the channel cavity;
the bottom of the ash bucket is provided with a device for fluidizing, flame-retarding and explosion-proof compressed nitrogen injection;
the vortex area where the middle box body, the ash bucket and the high-temperature flue gas primary cyclone separation/airflow equipartition device are intersected is provided with a device for flame-retardant/explosion-proof compressed nitrogen injection,
the waste heat recovery system comprises a membrane water wall combined type waste heat recovery device with independently replaceable heat pipes, the membrane water wall combined type waste heat recovery device with independently replaceable heat pipes comprises an upper box body, a plurality of sections of waste heat recovery sections, a middle transition section and an ash bucket, wherein the upper box body is positioned above the waste heat recovery sections, the middle transition section is positioned between the adjacent waste heat recovery sections, the ash bucket is positioned at the tail end of the waste heat recovery sections,
the upper box body is provided with a high-temperature flue gas inlet, the shell of the waste heat recovery section is a membrane water-cooled wall, the membrane water-cooled wall of the waste heat recovery section is provided with a heat pipe which is inserted from the outside and can be independently replaced, the heating surface of the heat pipe which can be independently replaced is coated with a heat-resistant and corrosion-resistant coating,
the high-temperature flue gas is cooled and simultaneously subjected to waste heat recovery through the vaporization cooling flue, the high-temperature phase-change type heat storage device adopting the micro-packaging process and the membrane water-cooled wall combined type waste heat recovery device with the independently replaceable heat pipes, and in the process, the high-temperature phase-change type heat storage device adopting the micro-packaging process performs heat storage or heat release.
The converter primary pure dry dedusting system integrates full waste heat recovery and stable fine purification, wherein the explosion-proof system comprises a spring self-resetting explosion-proof device capable of preventing explosion-proof smoke dust from escaping, an explosion-proof overflow smoke gas collecting and processing system jet flow induced air device and an explosion-proof overflow smoke gas temperature-adjusting flame arrester.
According to the converter one-time pure dry dedusting system integrating full waste heat recovery and stable fine purification, the spring self-resetting explosion venting device capable of preventing explosion venting smoke dust from escaping comprises an escaping smoke trapping cover shell and a spring self-resetting valve plate assembly, wherein,
the upper part of the external flue gas trapping cover shell is provided with an external flue gas guide outlet which is connected with a flue gas pipeline of the explosion venting external flue gas trapping treatment system,
the spring self-resetting valve plate assembly comprises a valve plate, a valve plate guide rod, a self-resetting spring set and a self-resetting spring set fixing frame, wherein,
the spring self-resetting valve plate assembly is fixed at the lower part of the inner cavity of the escape trapping shell through the valve plate guide rod; the upper part of the valve plate guide rod is provided with a valve plate guide rod and a self-resetting spring set fixing frame, the self-resetting spring set is fixed on the valve plate guide rod and the self-resetting spring set fixing frame, the self-resetting spring set applies pressure to the valve plate in a downward balanced manner,
the lower part of the valve plate is provided with an explosion venting flue gas leading-in port,
and the valve plate of the spring self-resetting valve plate assembly is sealed with the flange surface on the inner side of the lower part of the external smoke trapping cover shell through a sealing ring.
According to the converter primary pure dry dedusting system integrating full waste heat recovery and stable fine purification, the waste heat recovery system further comprises a multistage combined flue gas waste heat recovery device adopting a reinforced fin heat exchange tube structure.
The converter primary pure dry dedusting system integrates full waste heat recovery and stable fine purification, and comprises a flue gas temperature adjusting/fire retardant device.
The converter primary pure dry dedusting system integrates full waste heat recovery and stable fine purification, and comprises a pulse blowing filter bag/filter cartridge type deduster.
According to the converter primary pure dry dedusting system integrating full waste heat recovery and stable fine purification, a high-pressure steam drum, a descending pipe, a heat pipe evaporator at the upper part of the membrane water wall combined type waste heat recovery device with the independently replaceable heat pipes, an upper membrane water wall evaporator of the membrane water wall combined type waste heat recovery device with the independently replaceable heat pipes and the ascending pipe form a high-pressure evaporator system; the low-pressure evaporator system comprises a low-pressure steam drum, a downcomer, a lower heat pipe evaporator of the membrane water wall combined type waste heat recovery device with the independently replaceable heat pipes, a lower membrane water wall evaporator of the membrane water wall combined type waste heat recovery device with the independently replaceable heat pipes, an ascending pipe and the like.
According to the converter primary pure dry dedusting system integrating full waste heat recovery and stable fine purification, the waste heat recovery system comprises a torch waste heat recovery device adopting a reinforced fin heat exchange tube structure.
Has the advantages that:
1. the pulse-jet filter bag/filter cartridge dust removal device adopting the medium-temperature-resistant/high-temperature-resistant filter material can eliminate the frequent micro-explosion phenomenon caused by electric precipitation sparks, so that the system is safer to operate.
2. Compared with other dust removal and purification modes, the pulse-jet filter bag/filter cartridge dust removal device adopting the medium-temperature-resistant/high-temperature-resistant filter material has high and stable efficiency, can ensure stable recovery of clean dry gas and quality of discharged flue gas, and ensures that the dust content of the dry gas and the discharged flue gas is less than or equal to 10mg/Nm3。
3. The whole dry dedusting process has no water, the temperature of the recovered coal gas is low, the working condition air quantity of a primary fan is reduced, the power consumption of the fan is saved, and the water-saving, power-saving and environment-friendly benefits are obvious.
4. The converter gas is not directly contacted with water in the cooling process, the gas does not contain water, the CO loss is reduced, the gas recovery amount is large, the transportation and the use are facilitated, and the gas quality is high.
5. The full waste heat recovery device is utilized to recover the waste heat of the converter flue gas to the maximum extent, and the steam is stably produced for power generation or production and use, so that the energy-saving benefit is obvious.
6. Besides recovering heat and coal gas, various dusts are not mixed with water, so that the dust is easy to separate, recover and reuse, does not cause secondary pollution, and does not have wastewater treatment cost.
Drawings
FIG. 1 is a schematic structural diagram of a converter primary pure dry dedusting system integrating full waste heat recovery and stable fine purification;
FIG. 2 is a schematic view of a high-temperature phase-change thermal storage device;
FIG. 3 is a schematic structural diagram of a membrane wall combined waste heat recovery device with independently replaceable heat pipes;
fig. 4 is a schematic structural diagram of a spring self-resetting explosion venting device capable of preventing explosion venting smoke from escaping.
Reference numerals:
1, converter; 3: a gasification cooling flue; 4: the spring self-resetting explosion venting device can prevent explosion venting smoke dust from escaping; 5: the membrane type water-cooled wall combined waste heat recovery device can independently replace the heat pipe; 6: a high temperature phase change thermal storage device; 23: the jet flow induced draft device of the explosion venting overflow flue gas trapping treatment system; 17: a flue gas temperature conditioning/flame arrestor; 24: the flue gas temperature regulation/flame arrester ensures that the pulse spraying cloth bag/filter drum type dust remover is arranged at the rear part of the dust removal system; 27: a torch waste heat recovery device with a reinforced fin heat exchange tube structure is adopted; 39: a multistage combined flue gas waste heat recovery device with a reinforced fin heat exchange tube structure is adopted;
2-1: a high-temperature flue gas outlet of the high-temperature phase change heat storage device; 2-2: the high-temperature phase change heat storage device is arranged on the box body; 2-4: a housing; 2-5: a high temperature phase change heat storage core; 2-8: a middle box body; 2-9: an ash hopper; 2-12: the high-temperature phase change heat storage device compresses the nitrogen blowing device; 2-15: a high-temperature flue gas inlet of the high-temperature phase change heat storage device; 2-16: the dust-containing flue gas primary cyclone separation/gas flow equipartition device; 2-17: a fixing seat is arranged on the high-temperature phase change heat storage core; 2-18: pipe bundle and clearance channel for high-temperature flue gas to flow through
5-1: the combined waste heat recovery device is arranged on the box body; 5-2: a waste heat recovery section; 5-3: a middle transition section; 5-4: an ash hopper; 5-5: a gas shock wave soot blower; 5-6: a membrane wall; 5-7: a high-temperature flue gas inlet of the combined waste heat recovery device; 5-8: an access hole door; 5-9: a heat pipe; 5-10: a barrier; 5-11: a cooled flue gas outlet of the combined waste heat recovery device; 5-12: a compressed nitrogen blowing device of the combined waste heat recovery device; 5-13: pneumatic conveying transmitter for dust removal
4-2: an explosion venting and escaping flue gas collecting and processing system flue gas pipeline; 4-2: explosion venting and escaping trapping cover shell; 4-7: a self-resetting spring set; 4-8: a valve plate guide rod and a self-resetting spring set fixing frame; 4-9: a valve plate guide rod; 4-10: a valve plate; 4-14: an outward escape flue gas outlet; 4-15: an explosion venting flue gas inlet;
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The converter primary pure dry dedusting system integrating full waste heat recovery and stable fine purification comprises a vaporization cooling flue, a high-temperature phase-change type heat storage device, a waste heat recovery system and an explosion-proof system, wherein the waste heat recovery system comprises a membrane water wall combined type waste heat recovery device with heat pipes capable of being replaced independently, high-temperature flue gas is cooled and simultaneously subjected to waste heat recovery through the vaporization cooling flue, the high-temperature phase-change type heat storage device adopting a micro-packaging process and the membrane water wall combined type waste heat recovery device with the heat pipes capable of being replaced independently, and the high-temperature phase-change type heat storage device adopting the micro-packaging process stores heat or releases heat in the process.
The steam-water system of the evaporation cooling flue adopts a composite circulation cooling mode combining natural circulation and forced circulation. The evaporative cooling flue of the converter flue gas full dry method waste heat recovery and bag-type dust removal system is basically the same as the traditional evaporative cooling flue, belongs to the mature technology, but needs to be modified in local structure according to the characteristics of the full dry method dust removal system.
When the high-temperature phase-change heat storage device is in an oxygen blowing smelting working state of the converter (the temperature of the passing flue gas is highest and the amount of the passing flue gas is largest at the moment), the high-temperature flue gas enters the high-temperature phase-change heat storage device through an inlet arranged on the middle box body or the ash bucket along the tangential direction of the box body, the high-temperature flue gas is primarily separated and purified by a primary cyclone separation/airflow equipartition device arranged at an inlet, then, the high-temperature flue gas rises in the cylinder body and flows through a high-temperature phase change heat storage core arranged in the high-temperature phase change heat storage device, the high-temperature phase change heat storage material is respectively arranged in a honeycomb, a round or a square cavity of the high-temperature phase change heat storage device through a micro-packaging process, in a constant high-temperature section (namely 700-850 ℃), a large amount of heat of high-temperature flue gas is absorbed in time through the phase change of a high-temperature phase change heat storage material filled in a high-temperature heat storage core, and then the high-temperature flue gas flows out through a high-temperature flue gas outlet arranged on an upper box body of the high-temperature phase change heat storage device; when the converter is in a smelting working state without blowing oxygen (the temperature of the smoke passing through is relatively low and the amount of the smoke is less), the high-temperature phase-change heat storage material quickly releases a large amount of heat to the smoke passing through the high-temperature phase-change heat storage material when the phase change occurs in a constant high-temperature section (namely 700-850 ℃), the temperature of the passing smoke is increased, and the high-temperature smoke after the temperature increase flows out from a high-temperature smoke outlet arranged on a box body at the upper part of the high-temperature phase-change heat storage device. Therefore, the effect of alternating thermal stress of the high-temperature dust removal device and the waste heat recovery device in the dust removal system is avoided, the service lives of the high-temperature dust removal device and the waste heat recovery device are effectively prolonged, the daily maintenance and maintenance workload is reduced to the maximum extent, and the stability and the reliability of converter steelmaking production are ensured.
It also forms a set of constant temperature system together with the gas burner, which avoids the impact of the special production process of converter steel-making on the reciprocating rapid heating and quenching of the vaporization cooling flue and the waste heat recovery device.
The high-temperature phase-change type heat storage device can form a constant temperature system of a converter primary pure dry dedusting system together with a gas burner, a gas burner blower, a water-cooling two-way high-temperature reversing valve and a water-cooling three-way high-temperature reversing valve, and is a very key system of the converter primary pure dry dedusting system which integrates full waste heat recovery and stable fine purification. The system has the main function of aiming at the technological characteristics (namely intermittent production) of converter steelmaking, and furthest preventing the vaporization cooling flue and the waste heat recovery device of the converter primary dedusting system from being impacted by reciprocating rapid heating and rapid cooling.
The membrane water wall combined type waste heat recovery device (namely a waste heat boiler) with the independently replaceable heat pipe adopts a convection heat exchange surface, and solves a series of problems of preventing local accumulation and explosion of coal gas, dust accumulation, abrasion, dust removal, heat exchange and the like. The device recovers the waste heat of high-temperature flue gas through heat exchange pieces such as independently arranged heat pipes, membrane type water-cooled walls and the like, and plays a role in cooling the high-temperature flue gas and primary settling separation treatment of dust in the flue gas.
The flue gas temperature regulating/flame arrester ensures the safe, stable and reliable operation of the pulse blowing cloth bag/filter drum type dust remover at the rear part of the dust removing system, separates and removes fire species in flue gas, eliminates one of three elements (namely fire species with enough energy) of combustible gas explosion, and thereby fundamentally avoids explosion. The smoke temperature adjusting/fire arrester is provided with the explosion venting device, so that the system equipment is prevented from being damaged and lost even if explosion occurs, and the safety and high efficiency of the project are ensured. In addition, the flue gas temperature adjusting/fire retardant device adopts a forced water cooling mode to cool the flue gas, softened water is adopted for cooling the flue gas, and the softened water is used as an evaporator of a waste heat recovery device to supply water after being heated to a certain degree, so that the full recovery of the primary flue gas waste heat of the converter is realized.
The converter flue gas total waste heat recovery and bag-type dust removal system is a total dry process technology, adopts an anti-explosion type intermediate temperature resistant or high temperature resistant filter material ultralow emission pulse spraying filter bag/filter drum type dust remover, avoids unsafe factors of micro explosion caused by electric sparks of an electric dust remover, avoids the problems of bag pasting and the like through a high-temperature flue gas dry waste heat recovery cooling mode, and has stable dust removal effect which is superior to that of the electric dust removal and wet dust removal technologies. And the bottom of the dust removal system is provided with a dust collecting and conveying system.
The multi-stage combined flue gas waste heat recovery device adopting the reinforced fin heat exchange tube structure is used for realizing full waste heat recovery of primary flue gas of the converter, ensures the required temperature of clean dry gas recovery, and absorbs waste heat from the flue gas to the maximum extent. The method adopts a forced water cooling mode to cool the flue gas, softened water is adopted for cooling, and the softened water is used as an evaporator of a waste heat recovery device to supply water after being heated to a certain degree, so that the full recovery of the primary flue gas waste heat of the converter is realized.
The torch waste heat recovery device adopting the reinforced fin heat exchange tube structure is used for realizing the full waste heat recovery of the primary flue gas of the converter, the effective recovery of the heat of the released flue gas torch is realized by adopting a forced water cooling mode, softened water is adopted, and the softened water is used as a waste heat recovery device evaporator to supply water after being heated to a certain degree, so that the full recovery of the primary flue gas waste heat of the converter is realized.
The explosion venting and escaping smoke trapping and treating system comprises a spring self-resetting explosion venting device capable of preventing explosion venting smoke dust from escaping, a smoke pipeline of an explosion venting and escaping smoke trapping and treating system, a jet flow induced draft device of the explosion venting and escaping smoke trapping and treating system and an explosion venting and escaping smoke temperature regulating/fire arrester, and has the main functions of effectively trapping the explosion venting and escaping smoke dust at the moment, cooling, inflaming retarding and explosion resisting treatment, and then sending the smoke dust into an explosion-proof type medium-temperature-resistant or high-temperature-resistant filter material ultralow-emission pulse blowing filter bag/filter cartridge type dust remover in the system for purification and filtration treatment and then discharging the smoke dust together with main stream smoke of the system.
The vaporizing cooling flue, the membrane water wall combined type waste heat recovery device with the independently replaceable heat pipe, the high-pressure steam drum and the low-pressure steam drum form a steam-water system for recovering the full waste heat of the primary flue gas, wherein,
the high-pressure steam pocket, the downcomer, the heat pipe evaporator at the upper part of the membrane water-cooled wall combined type waste heat recovery device with the independently replaceable heat pipe, the membrane water-cooled wall evaporator at the upper part of the membrane water-cooled wall combined type waste heat recovery device with the independently replaceable heat pipe and the riser form a high-pressure evaporator system;
water in the high-pressure steam pocket enters an evaporator of the evaporative cooling flue through a descending pipe, absorbs heat of flue gas to form a steam-water mixture, enters the high-pressure steam pocket through an ascending pipe, is separated by a steam-water separator in the high-pressure steam pocket, and then steam is conveyed into a heat accumulator from the high-pressure steam pocket;
the heat pipe evaporator in the middle of the membrane water wall combined type waste heat recovery device with the independently replaceable heat pipes forms a coal economizer, water from the water dividing header is heated to 170 ℃, and then the water is sent to the high-pressure steam pocket;
the low-pressure steam pocket, the downcomer, the lower heat pipe evaporator of the membrane water wall combined type waste heat recovery device with the independently replaceable heat pipe, the lower membrane water wall evaporator of the membrane water wall combined type waste heat recovery device with the independently replaceable heat pipe, the riser and the like form a low-pressure evaporator system;
water in the low-pressure steam pocket enters each evaporator through a downcomer to absorb heat of flue gas to form a steam-water mixture, and low-pressure saturated steam generated by entering the low-pressure steam pocket through an ascending pipe is conveyed to a deaerator and used for boiler water supply heating and deaerating.
The device can effectively recover the full waste heat of the flue gas under the working states of converter oxygen blowing smelting and non-oxygen blowing smelting together with a torch waste heat recovery device adopting a reinforced fin heat exchange tube structure, a multi-stage flue gas water cooler with fins and a waste heat recovery device, generates saturated steam, effectively recovers the waste heat of the flue gas at the temperature of less than or equal to 200 ℃, and preheats softened water by using the recovered heat energy.
The operation mode of the converter primary pure dry dedusting system integrating full waste heat recovery and stable fine purification is as follows:
1. under the working condition of oxygen blowing smelting
Before oxygen blowing smelting is carried out on the converter, the water-cooling three-way high-temperature reversing valve acts to conduct the connection between the high-temperature flue gas outlet of the evaporative cooling flue and the high-temperature phase-change type heat storage device adopting the micro-packaging process, and meanwhile, the cold two-way high-temperature reversing valve acts to conduct the connection between the high-temperature flue gas outlet of the high-temperature phase-change type heat storage device adopting the micro-packaging process and the membrane type water-cooling wall combined type waste heat recovery device capable of independently replacing heat pipes. During the oxygen blowing smelting work period of the converter, under the suction action of an axial flow fan, high-temperature flue gas generated by oxygen blowing of the converter passes through a vaporization cooling flue, a high-temperature flue gas pipeline, a high-temperature phase-change type heat storage device adopting a micro-packaging process, a membrane water wall combined type waste heat recovery device capable of independently replacing heat pipes, a flue gas temperature adjusting/fire arrester, an anti-explosion medium-temperature-resistant or high-temperature-resistant filter material ultralow-emission pulse blowing filter bag/filter cartridge type dust remover, a flue gas pipeline, a multi-stage combined flue gas waste heat recovery device adopting a reinforced fin heat exchange pipe structure and the like. During the period, the high-temperature flue gas is cooled, the waste heat is recovered, the high-temperature flue gas is hyperfine purified and filtered, and meanwhile, the high-temperature phase-change type heat storage device adopting the micro-packaging process stores heat.
The smoke of the front section and the rear section of the oxygen blowing smelting is switched by a gas recovery and smoke diffusion switching valve and is diffused into the atmosphere through a diffusion chimney, a diffusion gas torch and a torch waste heat recovery device adopting a reinforced fin heat exchange tube structure.
Clean and dry coal gas in the middle stage of oxygen blowing smelting is switched by a coal gas recovery/flue gas diffusion switching valve, and the coal gas is collected into a coal gas cabinet through a coal gas recovery pipeline.
2. Under the working state of non-oxygen blowing smelting
During the period that the converter does not carry out oxygen blowing smelting, the water-cooling three-way high-temperature reversing valve in the system acts to respectively conduct the connection between the high-temperature flue gas outlet of the evaporative cooling flue and the membrane water-cooling wall combined type waste heat recovery device with the heat pipe capable of being replaced independently and the connection between the high-temperature phase-change type heat storage device adopting the micro-packaging process and the gas burner, and meanwhile, the water-cooling two-way high-temperature reversing valve in the system acts to conduct the connection between the gas burner blower and the high-temperature phase-change type heat storage device adopting the micro-packaging. During the non-oxygen blowing smelting work period of the converter, under the suction action of an axial flow fan, the gas combustion utilizes the air blown by a blower of a gas burner to pass through a high-temperature phase-change type heat storage device adopting a micro-packaging process-6, the high-temperature flue gas generated by the gas CO sprayed into the gas burner and sprayed into the gas burner passes through a vaporization cooling flue, a high-temperature flue gas pipeline, a membrane water-cooled wall combined type waste heat recovery device flue gas temperature adjusting/fire arrester with independently replaceable heat pipes, an anti-explosion medium-temperature-resistant or high-temperature-resistant filter material ultralow-emission pulse spraying filter bag/filter cartridge type dust remover, a flue gas pipeline, a multistage combined flue gas waste heat recovery device adopting a reinforced fin heat exchange pipe structure and the like. During the period, the high-temperature flue gas is cooled/recovered with waste heat and is hyperfine purified and filtered. The treated flue gas is switched by a gas recovery/flue gas diffusion switching valve and is diffused into the atmosphere through a diffusion chimney, a diffusion gas torch and a torch waste heat recovery device adopting a reinforced fin heat exchange tube structure.
3. Waste heat recovery
The device comprises a vaporization cooling flue, a membrane water wall combined type waste heat recovery device with a heat pipe capable of being replaced independently, a flue gas temperature regulating/fire arrestor, a multistage combined flue gas waste heat recovery device with a reinforced fin heat exchange pipe structure, an explosion venting overflow flue gas temperature regulating/fire arrestor, a torch waste heat recovery device with a reinforced fin heat exchange pipe structure, a waste heat recovery steam-water system and the like, and the whole waste heat of the flue gas is effectively recovered under the working states of converter oxygen blowing smelting and non-oxygen blowing smelting.
4. Effective treatment of overflow smoke dust generated during explosion venting of explosion venting valve
The dustproof overflow type spring self-reset explosion venting valve device automatically vents explosion when the system device is in an abnormal state, and the generated overflow smoke dust is treated by an explosion venting overflow smoke gas collecting and treating system smoke gas pipeline, an explosion venting overflow smoke gas temperature regulating/fire retardant device, an explosion venting overflow smoke gas collecting and treating system jet flow induced draft device and the like and then is led into an explosion-proof type medium-temperature-resistant or high-temperature-resistant filter material ultralow-emission pulse blowing filter bag/filter cartridge type dust remover for purification and filtration treatment.
By utilizing the technical scheme of the invention, a pure dry type dust removal process is adopted, so that the consumption of water and steam is 0%; the device comprises a high-temperature phase change type heat accumulator, a gas burner, a water-cooled high-temperature valve, a gas burner blower, a water-cooled two-way/three-way reversing valve and the like, wherein the high-temperature phase change type heat accumulator, the gas burner, the water-cooled high-temperature valve, the gas burner blower, the water-cooled two-way/three-way reversing valve and the like are additionally arranged by adopting a micro-packaging process, and the high-temperature smoke is continuously generated in a vaporization cooling flue by switching between a converter oxygen blowing smelting working state and a non-oxygen blowing smelting working state, so that the problem of thermal expansion and cold contraction caused by rapid cooling and rapid heating of the vaporization.
The high-temperature phase-change heat accumulator adopting the micro-packaging process has high heat storage density, can effectively realize the storage and the release of heat energy at the temperature of more than or equal to 800 ℃, and can realize the storage and the release of the heat energy basically constant within the set temperature access, thereby solving the contradiction that the supply and the demand of the heat energy are not matched in time and strength due to the particularity of the converter steelmaking process.
Through setting up dustproof excessive formula spring from restoring to throne and leaking out valve device, collection pipeline and corresponding follow-up processing apparatus etc. to leaking out and exploding excessive smoke and dust when valve is let out and explode and can effectively be retrieved and handle, prevent to let out to explode the secondary pollution problem that probably produces and take place.
The membrane water-cooled wall combined type waste heat recovery device with the independently replaceable heat pipes is used for effectively cooling high-temperature flue gas, and the primary flue gas waste heat of the converter is recovered to the maximum extent.
The anti-explosion ultra-low emission pulse bag-type dust collector is adopted to perform ultra-fine filtration treatment on the primary flue gas of the converter, so that the explosion venting problem caused by electrostatic dust collection power generation is thoroughly avoided, the safe and stable operation of the primary dust collection system of the converter is ensured, the stable recovery of clean dry gas and the stable dust content of the discharged flue gas of less than or equal to 10mg/Nm are realized3。
The corrosion problem of gas pipelines and equipment facilities is reduced to the maximum extent, and the smoke plume of the diffused smoke is thoroughly avoided.
The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.
Example 1
As shown in fig. 1, the evaporative cooling flue 2, the high-temperature phase-change heat storage device 6, the waste heat recovery system, and the explosion-proof system, wherein the waste heat recovery system includes a membrane wall combined type waste heat recovery device 5 capable of independently replacing heat pipes, and the high-temperature flue gas generated by the converter 1 is cooled and simultaneously subjected to waste heat recovery through the evaporative cooling flue 2, the high-temperature phase-change heat storage device 5, and the membrane wall combined type waste heat recovery device 5 capable of independently replacing heat pipes, and in the process, the high-temperature phase-change heat storage device 6 performs heat storage or heat release.
Before oxygen blowing smelting is carried out on the converter, the high-temperature flue gas outlet of the vaporization cooling flue 3 is communicated with the high-temperature phase-change type heat storage device 6 through the action of the water-cooling three-way high-temperature reversing valve, and meanwhile, the high-temperature flue gas outlet of the high-temperature phase-change type heat storage device 6 is communicated with the membrane type water-cooled wall combined type waste heat recovery device 5 capable of independently replacing heat pipes through the action of the cold two-way high-temperature reversing valve. During the oxygen blowing smelting work period of the converter 1, under the suction action of the axial flow fan, high-temperature flue gas generated by oxygen blowing of the converter passes through the vaporization cooling flue 2, the high-temperature flue gas pipeline, the high-temperature phase-change type heat storage device 6, the membrane water wall combined type waste heat recovery device 5 with the heat pipe capable of being replaced independently, the flue gas temperature adjusting/fire stopping device 17, the anti-explosion medium-temperature-resistant or high-temperature-resistant filter material ultralow-emission pulse blowing filter bag/filter cartridge type dust remover 24, the flue gas pipeline, the multistage combined flue gas waste heat recovery device 39 with the reinforced fin heat exchange pipe structure and the like. During the period, the high-temperature flue gas is cooled, the waste heat is recovered, the high-temperature flue gas is hyperfine purified and filtered, and meanwhile, the high-temperature phase-change type heat storage device adopting the micro-packaging process stores heat.
The smoke of the front section and the rear section of the oxygen blowing smelting is switched by a gas recovery and smoke diffusion switching valve and is diffused into the atmosphere through a diffusion chimney, a diffusion gas torch and a torch waste heat recovery device 27 adopting a reinforced fin heat exchange tube structure.
Clean and dry coal gas in the middle stage of oxygen blowing smelting is switched by a coal gas recovery/flue gas diffusion switching valve, and the coal gas is collected into a coal gas cabinet through a coal gas recovery pipeline.
During the period that the converter does not carry out oxygen blowing smelting, a water-cooling three-way high-temperature reversing valve in the system acts to respectively conduct the connection between a high-temperature flue gas outlet of the evaporative cooling flue 2 and a membrane water-cooling wall combined type waste heat recovery device 5 with heat pipes capable of being replaced independently and the connection between a high-temperature phase-change type heat storage device 6 and a gas burner, and meanwhile, the water-cooling two-way high-temperature reversing valve in the system acts to conduct the connection between a gas burner blower and the high-temperature phase-change type heat storage device. In the non-oxygen blowing smelting working period of the converter 1, under the suction action of an axial flow fan, the gas combustion utilizes the high-temperature phase change type heat storage device to preheat the air blown by a gas burner blower at high temperature, and the high-temperature flue gas generated by the gas CO sprayed into the gas burner and sprayed into the gas burner passes through a vaporization cooling flue, a high-temperature flue gas pipeline, a membrane water-cooled wall combined type waste heat recovery device flue gas temperature adjusting/fire arrester with independently replaceable heat pipes, an anti-explosion type intermediate temperature resistant or high temperature resistant filter material ultra-low emission pulse spraying filter bag/filter cartridge type dust remover, a flue gas pipeline, a multistage combined flue gas waste heat recovery device adopting a reinforced fin heat exchange pipe structure and the like. During the period, the high-temperature flue gas is cooled/recovered with waste heat and is hyperfine purified and filtered. The treated flue gas is switched by a gas recovery/flue gas diffusion switching valve and is diffused into the atmosphere through a diffusion chimney, a diffusion gas torch and a torch waste heat recovery device adopting a reinforced fin heat exchange tube structure.
The device comprises a vaporization cooling flue, a membrane water wall combined type waste heat recovery device with a heat pipe capable of being replaced independently, a flue gas temperature regulating/fire retardant device, a multistage combined flue gas waste heat recovery device with a reinforced fin heat exchange pipe structure, an explosion venting overflow flue gas temperature regulating/fire retardant device, a torch waste heat recovery device with a reinforced fin heat exchange pipe structure, a waste heat recovery steam-water system and the like, and is used for effectively recovering the whole flue gas waste heat under the working states of converter oxygen blowing smelting and non-oxygen blowing smelting.
The explosion-proof system comprises a spring self-resetting explosion-proof device 4 capable of preventing explosion-proof smoke dust from escaping, the spring self-resetting explosion-proof device 4 capable of preventing explosion-proof smoke dust from escaping is automatically exploded when the system device is in an abnormal state, and the generated overflow smoke dust is treated by an explosion-proof overflow smoke gas collecting and treating system smoke gas pipeline, an explosion-proof overflow smoke gas temperature regulating/fire retardant device and an explosion-proof overflow smoke gas collecting and treating system jet flow induced draft device 23 and then is led into a pulse blowing cloth bag/filter drum type dust remover 24 for purification and filtration treatment.
Example 2
As shown in fig. 2, the high-temperature phase-change type heat storage device comprises a circular shell 2-4 and an ash bucket 2-9, wherein the shell comprises an upper box body 2-2 and a middle box body 2-8, a high-temperature phase-change heat storage core 2-5 is arranged in the middle box body 2-8, and the upper box body 2-2 is positioned at the upper part of the high-temperature phase-change heat storage core 2-5 in the middle box body 2-8; the middle box body 2-8 and the upper box body 2-2 can be opened so as to facilitate installation, replacement, maintenance and repair of the high-temperature phase change heat storage core 2-5 arranged in the middle box body; the ash buckets 2-9 are positioned below the middle box bodies 2-8;
the upper box body 2-2 is provided with a high-temperature flue gas outlet 2-1, the middle box body 2-8 or the ash bucket 2-9 is provided with a high-temperature flue gas inlet 2-15, the high-temperature flue gas inlet 2-15 is connected along the tangential direction of the circular shell, and is used for carrying out primary separation and sedimentation treatment on high-temperature dusty flue gas entering the dust remover together with a primary cyclone separation/airflow distribution device 2-16 for dusty flue gas arranged in the middle box body 2-8 or the ash bucket 2-9;
the straight pipe wall at the lower part of the dust-containing flue gas primary cyclone separation/air flow equipartition device 2-16 is provided with an air flow cavity (phi 20-30mm hole) with the aperture ratio of 40-50%;
the lower parts of the ash hoppers 2 to 9 are provided with a dust-removing pneumatic conveying transmitter device;
a honeycomb-shaped high-temperature phase change heat storage core is arranged in the middle box body through the high-temperature phase change heat storage core mounting fixing seat 2-17; the honeycomb-shaped tube bundle of the high-temperature phase-change heat storage core and the gap between the honeycomb-shaped tube bundle and the middle box body are high-temperature flue gas flowing channels; a gas shock wave soot blower is arranged in the upper box body and is used for blowing and cleaning high-temperature flue gas of a high-temperature phase-change heat storage core fixed in the middle box body through the wall of the channel cavity;
the bottom of the ash bucket is provided with 2-12 compressed nitrogen injection devices for fluidization, flame retardance and explosion prevention;
and the middle box body, the ash bucket and the high-temperature flue gas primary cyclone separation/airflow equipartition device are provided with 2-12 compressed nitrogen injection devices for flame retardance and explosion prevention in a vortex region.
The shell of the high-temperature phase-change heat storage device and the inner wall of the ash bucket are provided with a high-temperature resistant protective layer, and the outer wall of the shell is provided with a heat insulation cotton layer and a protective plate layer.
The shell of the high-temperature phase-change heat storage device, the high-temperature phase-change heat storage core mounting fixing seat, the dust-containing smoke primary cyclone separation/airflow sharing device and other internal components are made of high-temperature-resistant stainless steel materials.
According to the high-temperature phase-change type heat storage device suitable for the converter steelmaking dust removal system, the phase-change heat storage core is formed by filling phase-change heat storage materials into a honeycomb-shaped high-temperature phase-change heat storage device shell with a plurality of tube bundles, and then vacuumizing the high-temperature phase-change heat storage device through the air exhaust sealing head.
When the converter is in an oxygen blowing smelting working state, the temperature of the passing flue gas is highest, the flue gas volume is largest, the high-temperature flue gas enters the high-temperature phase-change heat storage device along the tangential direction of the box body through an inlet formed in the middle box body or the ash bucket, primary separation and purification are carried out on the high-temperature flue gas through the primary cyclone separation/air flow equal distribution device arranged at the inlet, then the high-temperature flue gas rises in the barrel and flows through the high-temperature phase-change heat storage core arranged in the high-temperature phase-change heat storage device, in a constant high-temperature section (namely 700-850 ℃), the high-temperature phase-change heat storage material filled in the high-temperature heat storage core is subjected to phase change to absorb a large amount of heat of the high-temperature flue gas in time.
When the converter is in a smelting working state without blowing oxygen, the temperature of the smoke passing through the converter is relatively low, the smoke volume is less, a large amount of heat is rapidly released to the smoke passing through the converter when the high-temperature phase change heat storage material is subjected to phase change in a constant high-temperature section (namely 700-850 ℃), the temperature of the passing smoke is increased, and the high-temperature smoke subjected to temperature increase flows out from a high-temperature smoke outlet arranged on a box body at the upper part of the high-temperature phase change heat storage device.
Example 3
As shown in fig. 3, the membrane wall combined type waste heat recovery device with the independently replaceable heat pipe comprises a round-square variable-diameter high-temperature flue gas upper box body 5-1, a plurality of sections of square waste heat recovery sections 5-2, a middle transition section 5-3 and an ash bucket 5-4, wherein the upper box body 5-1 is positioned above the waste heat recovery section 5-2; the intermediate transition section 5-3 is positioned between the adjacent waste heat recovery sections 5-2,
the upper box body 5-1 is provided with a high-temperature flue gas inlet 5-7, the upper box body 5-1 and each intermediate transition section 5-3 are respectively provided with an access hole door 5-8, and the access hole doors 5-8 are provided with a gas shock wave soot blowing device 5-5 for blowing and cleaning ash of the heat pipe; the shell of the waste heat recovery section 5-2 adopts a membrane water-cooled wall 5-6; the membrane water-cooled wall of the waste heat recovery section 5-2 is provided with an externally inserted heat pipe 5-9 which can be independently replaced; the heating surface of the heat pipe 5-9 which can be independently replaced adopts a supersonic speed electric arc spraying layer of heat-resistant, wear-resistant and corrosion-resistant special alloy coating. The externally inserted heat pipe 5-9 which can be replaced independently is fixed in an inserted sleeve arranged on the membrane water wall 5-6 of the waste heat recovery section 5-2 through a flange and a ceramic fiber bush welded on the heat pipe by fastening screws and gaskets;
the ash hopper 5-4 is positioned at the tail end of the waste heat recovery section, and a cooled flue gas outlet 5-11 is arranged at one side of the ash hopper 5-4 corresponding to the inlet of the waste heat recovery section 5-2; a set of barrier baffle plates 5-10 are arranged between the ash hopper 5-4 and the end section inlet of the waste heat recovery section 5-2 and the cooled flue gas outlet 5-11 and are used for effectively settling and filtering dust particles in the flue gas; the lower part of the ash bucket is provided with a dust-removing pneumatic conveying transmitter 5-13; 5-2 of each section of waste heat recovery is provided with a flame-retardant/explosion-proof compressed nitrogen injection device; and 5-12 compressed nitrogen blowing devices for fluidization, flame retardance and explosion prevention are arranged at the bottom 5-4 of the ash bucket.
Example 4
As shown in fig. 4, the spring self-resetting explosion venting device for preventing explosion venting smoke dust from escaping comprises an explosion venting and escaping capturing cover shell 4-6 and a spring self-resetting valve plate assembly, wherein the shell comprises an escaping smoke gas outlet 4-14 arranged at the upper part of the explosion venting and escaping smoke gas capturing cover shell, and the escaping smoke gas outlet 4-14 is connected with a smoke gas pipeline 4-2 of an explosion venting and escaping smoke gas capturing and treating system; the lower part of the explosion venting and escaping trapping shell 4-6 (namely the lower part of the valve plate of the spring self-resetting valve plate assembly) is provided with an explosion venting flue gas inlet 4-15; the spring self-resetting valve plate assembly is fixed at the lower part of the inner cavity of the explosion venting and escaping trapping shell 4-6 through a valve plate guide rod 4-9; the spring self-resetting valve plate assembly valve plate 4-10 is sealed with the flange surface on the inner side of the lower part of the shell through a sealing ring; the spring self-resetting valve plate assembly is characterized in that a valve plate guide rod and a self-resetting spring set fixing frame 4-8 are arranged at the upper part of a valve plate guide rod 4-9; the self-reset spring set 4-7 is fixed on the valve plate guide rod and the self-reset spring set fixing frame 4-8, and the self-reset spring set 4-7 applies pressure to the valve plate in a downward balanced manner; the spring self-resetting explosion venting device capable of preventing explosion venting smoke dust from escaping is fixedly connected with the explosion venting flange of the process device through a lower flange thereof by a fastener set.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (8)
1. A converter primary pure dry dedusting system integrating full waste heat recovery and stable fine purification is characterized by comprising an evaporative cooling flue, a high-temperature phase change type heat storage device, a waste heat recovery system and an explosion-proof system,
wherein,
the high-temperature phase-change type heat storage device comprises a circular shell and an ash bucket, wherein the shell comprises an upper box body and a middle box body, a high-temperature phase-change heat storage core is arranged in the middle box body, the upper box body is positioned at the upper part of the middle box body, which is provided with the high-temperature phase-change heat storage core, and the ash bucket is positioned below the middle box body;
the upper box body is provided with a high-temperature flue gas outlet, the middle box body or the ash bucket is provided with a high-temperature flue gas inlet, the high-temperature flue gas inlet is provided with a primary cyclone separation/airflow uniform distribution device, and the high-temperature flue gas inlet is accessed along the tangential direction of the circular shell;
uniformly distributed air flow cavities are formed in the straight section of the pipe wall at the lower part of the dust-containing flue gas primary cyclone separation/air flow uniform distribution device;
the lower part of the ash bucket is provided with a dust-removing pneumatic conveying transmitter device;
the high-temperature phase change heat storage core is a honeycomb tube bundle, and gaps between the high-temperature phase change heat storage core and the middle box body are high-temperature flue gas flowing channels;
a gas shock wave soot blower is arranged in the upper box body and used for blowing and cleaning high-temperature flue gas flowing through the wall of the channel cavity;
the bottom of the ash bucket is provided with a device for fluidizing, flame-retarding and explosion-proof compressed nitrogen injection;
the vortex area where the middle box body, the ash bucket and the high-temperature flue gas primary cyclone separation/airflow equipartition device are intersected is provided with a device for flame-retardant/explosion-proof compressed nitrogen injection,
the waste heat recovery system comprises a membrane water wall combined type waste heat recovery device with independently replaceable heat pipes, the membrane water wall combined type waste heat recovery device with independently replaceable heat pipes comprises an upper box body, a plurality of sections of waste heat recovery sections, a middle transition section and an ash bucket, wherein the upper box body is positioned above the waste heat recovery sections, the middle transition section is positioned between the adjacent waste heat recovery sections, the ash bucket is positioned at the tail end of the waste heat recovery sections,
the upper box body is provided with a high-temperature flue gas inlet, the shell of the waste heat recovery section is a membrane water-cooled wall, the membrane water-cooled wall of the waste heat recovery section is provided with a heat pipe which is inserted from the outside and can be independently replaced, the heating surface of the heat pipe which can be independently replaced is coated with a heat-resistant and corrosion-resistant coating,
the high-temperature flue gas is cooled and simultaneously subjected to waste heat recovery through the vaporization cooling flue, the high-temperature phase-change type heat storage device adopting the micro-packaging process and the membrane water-cooled wall combined type waste heat recovery device with the independently replaceable heat pipes, and in the process, the high-temperature phase-change type heat storage device adopting the micro-packaging process performs heat storage or heat release.
2. The converter primary pure dry dedusting system integrating full waste heat recovery and stable fine purification as claimed in claim 1, wherein the explosion venting prevention system comprises a spring self-resetting explosion venting device capable of preventing explosion venting smoke from escaping, an explosion venting overflow smoke collecting and processing system jet induced air device, and an explosion venting overflow smoke temperature adjusting flame arrester.
3. The converter primary pure dry dedusting system integrating full waste heat recovery and stable fine purification as claimed in claim 1, wherein the spring self-resetting explosion venting device capable of preventing explosion venting smoke from escaping comprises an escaping smoke trapping cover shell and a spring self-resetting valve plate assembly, wherein,
the upper part of the external flue gas trapping cover shell is provided with an external flue gas guide outlet which is connected with a flue gas pipeline of the explosion venting external flue gas trapping treatment system,
the spring self-resetting valve plate assembly comprises a valve plate, a valve plate guide rod, a self-resetting spring set and a self-resetting spring set fixing frame, wherein,
the spring self-resetting valve plate assembly is fixed at the lower part of the inner cavity of the escape trapping shell through the valve plate guide rod; the upper part of the valve plate guide rod is provided with a valve plate guide rod and a self-resetting spring set fixing frame, the self-resetting spring set is fixed on the valve plate guide rod and the self-resetting spring set fixing frame, the self-resetting spring set applies pressure to the valve plate in a downward balanced manner,
the lower part of the valve plate is provided with an explosion venting flue gas leading-in port,
and the valve plate of the spring self-resetting valve plate assembly is sealed with the flange surface on the inner side of the lower part of the external smoke trapping cover shell through a sealing ring.
4. The converter primary pure dry dedusting system integrating full waste heat recovery and stable fine purification as claimed in claim 1, wherein the waste heat recovery system further comprises a multi-stage combined flue gas waste heat recovery device adopting a reinforced fin heat exchange tube structure.
5. The converter primary pure dry dedusting system integrating full waste heat recovery and stable fine purification as claimed in claim 1, wherein the converter primary pure dry dedusting system comprises a flue gas temperature adjusting flame arrester.
6. The converter primary pure dry dedusting system integrating full waste heat recovery and stable fine purification as claimed in claim 1, wherein the converter primary pure dry dedusting system comprises a pulse blowing filter bag/filter cartridge type deduster.
7. The converter primary pure dry dedusting system integrating full waste heat recovery and stable fine purification as claimed in claim 1, wherein a high pressure steam pocket, a down comer, a heat pipe evaporator at the upper part of the membrane water wall combined type waste heat recovery device with independently replaceable heat pipes, a membrane water wall evaporator at the upper part of the membrane water wall combined type waste heat recovery device with independently replaceable heat pipes and an up comer form a high pressure evaporator system; the low-pressure evaporator system comprises a low-pressure steam drum, a downcomer, a lower heat pipe evaporator of the membrane water wall combined type waste heat recovery device with the independently replaceable heat pipes, a lower membrane water wall evaporator of the membrane water wall combined type waste heat recovery device with the independently replaceable heat pipes, an ascending pipe and the like.
8. The converter primary pure dry dedusting system integrating full waste heat recovery and stable fine purification as claimed in claim 1, wherein the waste heat recovery system comprises a torch waste heat recovery device adopting an enhanced fin heat exchange tube structure.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021211684 | 2020-06-25 | ||
| CN2020212116847 | 2020-06-25 |
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| Publication Number | Publication Date |
|---|---|
| CN112063793A true CN112063793A (en) | 2020-12-11 |
| CN112063793B CN112063793B (en) | 2024-08-30 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114606358A (en) * | 2022-03-17 | 2022-06-10 | 浙江伯益环境科技有限公司 | Steelmaking converter flue gas waste heat recovery and dry dedusting system |
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| US20050051110A1 (en) * | 2001-12-13 | 2005-03-10 | Risto Saarinen | Method and apparatus for increasing the capacity of a waste heat boiler in a metallurgic smelting furnance |
| CN110184411A (en) * | 2019-07-18 | 2019-08-30 | 无锡红旗除尘设备有限公司 | The full dry cloth-bag dusting system of the energy-efficient ultra-clean discharge of flue gas of converter |
| CN213388752U (en) * | 2020-06-25 | 2021-06-08 | 北京蓝天益鹏科技发展有限公司 | Primary pure dry dedusting system of converter integrating full waste heat recovery and stable fine purification |
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| US20050051110A1 (en) * | 2001-12-13 | 2005-03-10 | Risto Saarinen | Method and apparatus for increasing the capacity of a waste heat boiler in a metallurgic smelting furnance |
| CN110184411A (en) * | 2019-07-18 | 2019-08-30 | 无锡红旗除尘设备有限公司 | The full dry cloth-bag dusting system of the energy-efficient ultra-clean discharge of flue gas of converter |
| CN213388752U (en) * | 2020-06-25 | 2021-06-08 | 北京蓝天益鹏科技发展有限公司 | Primary pure dry dedusting system of converter integrating full waste heat recovery and stable fine purification |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114606358A (en) * | 2022-03-17 | 2022-06-10 | 浙江伯益环境科技有限公司 | Steelmaking converter flue gas waste heat recovery and dry dedusting system |
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