CN115466816A - Converter, vaporization cooling flue of converter, and converter gas recovery pretreatment system and method - Google Patents
Converter, vaporization cooling flue of converter, and converter gas recovery pretreatment system and method Download PDFInfo
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- 238000001816 cooling Methods 0.000 title claims abstract description 110
- 238000009834 vaporization Methods 0.000 title claims abstract description 107
- 230000008016 vaporization Effects 0.000 title claims abstract description 107
- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000007789 gas Substances 0.000 claims abstract description 166
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 122
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 121
- 238000010791 quenching Methods 0.000 claims abstract description 119
- 230000000171 quenching effect Effects 0.000 claims abstract description 119
- 239000000428 dust Substances 0.000 claims abstract description 93
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 92
- 239000002956 ash Substances 0.000 claims abstract description 78
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 77
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 52
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 51
- 239000001301 oxygen Substances 0.000 claims abstract description 51
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 46
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 46
- 239000007921 spray Substances 0.000 claims abstract description 42
- 239000010881 fly ash Substances 0.000 claims abstract description 40
- 229910002091 carbon monoxide Inorganic materials 0.000 claims abstract description 37
- 238000006243 chemical reaction Methods 0.000 claims abstract description 32
- 239000000779 smoke Substances 0.000 claims abstract description 17
- 239000000843 powder Substances 0.000 claims description 87
- 239000003546 flue gas Substances 0.000 claims description 45
- 238000009826 distribution Methods 0.000 claims description 32
- 238000003860 storage Methods 0.000 claims description 19
- 238000001514 detection method Methods 0.000 claims description 15
- 239000002245 particle Substances 0.000 claims description 14
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- 238000007664 blowing Methods 0.000 claims description 6
- 239000003034 coal gas Substances 0.000 abstract description 31
- 238000004880 explosion Methods 0.000 abstract description 12
- 238000004064 recycling Methods 0.000 abstract 2
- 238000009628 steelmaking Methods 0.000 description 18
- 239000000571 coke Substances 0.000 description 17
- 230000001965 increasing effect Effects 0.000 description 15
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- 238000003723 Smelting Methods 0.000 description 11
- 230000009467 reduction Effects 0.000 description 11
- 239000002699 waste material Substances 0.000 description 9
- 229910000831 Steel Inorganic materials 0.000 description 8
- 238000004134 energy conservation Methods 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
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- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 2
- 239000003830 anthracite Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
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- 230000007613 environmental effect Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000002910 solid waste Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
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- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 230000009967 tasteless effect Effects 0.000 description 1
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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
-
- 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
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The application discloses a converter, a vaporization cooling flue of the converter, and a system and a method for recycling pretreatment of converter gas, wherein the vaporization cooling flue is a converter vaporization cooling flue capable of improving the recycling amount of the converter gas and comprises a movable smoke hood, a furnace mouth fixed section flue, a middle section flue and a tail end flue; the converter vaporization cooling flue is connected with the carbon conveying system, the carbon conveying system sprays dry quenching dust removal ash into the flue, and carbon dioxide and oxygen in converter gas entering the converter vaporization cooling flue react with the dry quenching dust removal ash respectively to generate carbon monoxide. The application provides a converter coal gas and dry quenching fly ash in converter vaporization cooling flue take place the reaction under flue high temperature environment, utilize the carbon dioxide and the oxygen reaction of dry quenching fly ash in with the converter coal gas for carbon monoxide, have reduced the content of carbon dioxide and oxygen simultaneously, have promoted the recovery volume of converter coal gas to carbon monoxide, have promoted the recovery quality of converter coal gas promptly, and have reduced oxygen content and also reduced the explosion risk.
Description
Technical Field
The application relates to the technical field of converter gas recovery, in particular to a converter vaporization cooling flue capable of improving the recovery amount and the heat value of converter gas, a converter gas recovery pretreatment system and method, and a converter capable of improving the recovery amount and the heat value of converter gas.
Background
The 'negative energy steelmaking' of the converter is the comprehensive embodiment of energy-saving technology in the steelmaking production process, which not only embodies the energy conservation and the reduction of environmental pollution, but also embodies the energy management level of one factory. The negative energy steelmaking means that the energy of the coal gas and the steam recovered in the steelmaking process is larger than the total energy of water, electricity, wind, gas and the like consumed in the actual steelmaking process, and the recovery of the converter coal gas accounts for 80-90% of the energy recovery part of the whole converter process, so that the negative energy steelmaking process is a key link for reducing the process energy consumption and realizing the negative energy steelmaking. Therefore, in order to realize energy conservation and emission reduction, the converter gas recovery system becomes one of the process links of energy recovery widely adopted in the current metallurgical industry.
The converter gas is a by-product in the converter steelmaking process, and is a mixed gas of carbon monoxide and a small amount of carbon dioxide generated by carbon in molten iron at a high temperature and blown oxygen in the converter steelmaking process. The temperature of the flue gas at the furnace mouth can reach 1450-1600 ℃, the flue gas is colorless and tasteless toxic gas, and the heat productivity is 6800kJ/m 3 ～10000kJ/m 3 The ignition point is about 600-700 ℃, and the density is 1.25 kg/N.m 3 ～1.29kg/N·m 3 . The components of the converter gas are continuously changed along with the smelting process, and the main components are sorted according to the decreasing proportion rule as follows: CO, CO 2 、N 2 、H 2 、O 2 . The main flue gas component in the converter gas is CO, and in order to achieve the safety index of converter gas recovery, the temperature and the concentration of the converter gas are not in the range of ignition point and explosion limit concentration.
In the converter blowing process, high-temperature waste gas with the main components of CO and O at the temperature of about 1600-1800 ℃ is generated 2 、CO 2 、N 2 And SO 2 The content of CO can reach more than 80 percent, and the dust-containing concentration can reach 80 to 150g/Nm 3 10 kg-30 kg industrial dust can be generated per ton steel. Therefore, the converter flue gas has the characteristics of high temperature, toxicity, flammability, explosiveness, high dust content and the like, can be recycled, and realizes energy conservation and emission reduction.
The main process system of the converter gas recovery system comprises a flue heat exchange device, a cooling device, a coarse dust removal device, a fine dust removal device, an induced draft fan, a switching station, a pipe network, a control system and the like. The converter flue gas purification and recovery system mainly comprises the processes of flue gas collection, transportation, cooling, purification, pumping, diffusion and the like, but a vaporization cooling flue can not be separated no matter an OG method (converter flue gas wet dust removal) or an LT method (converter flue gas electrostatic dust removal) is adopted. The converter vaporization cooling flue is one of key devices of a steelmaking process, and has the functions of reducing the smoke exhaust temperature, recovering waste heat in high-temperature smoke, collecting part of smoke dust in the smoke, and ensuring the smooth operation of the steelmaking process. The OG method and the LT method are mainly different in dust removal mode after the evaporation flue, but the structure of the evaporation flue part is approximately the same, and the OG method and the LT method mainly comprise the following steps: the movable smoke hood, the fire hole fixed section flue, the middle section flue and the end section flue and the like.
The factors influencing the coal gas recovery of the converter include converter equipment conditions, raw material conditions, carbon content of molten steel, air intake, coal gas recovery conditions, oxygen supply strength and the like, wherein the air intake, the coal gas recovery conditions, the oxygen supply strength and the like have particularly remarkable influence on the coal gas recovery.
The existing converter gas recovery system has the following defects in application practice: at high temperature (1600-1800 ℃) of converter flue gas and high dust (80-150 g/Nm) 3 ) The recovery amount of the converter gas is low and the calorific value of the gas is low under the extreme conditions of high CO content (0-80%), periodic smelting and the like, so that the converter gas is greatly wasted; further, the converter gas is CO in the middle stage of smelting 2 Content and O in the early and late stages of smelting 2 The content of O in the converter gas is further reduced 2 If the content is more than 2%, there is a risk of explosion.
Therefore, based on the consideration of safety and the improvement of the recovery quality of the converter gas, new technical schemes should be proposed at the present stage to improve the recovery amount and the calorific value of the converter gas and reduce the emission amount of carbon dioxide in the flue gas of the converter.
Disclosure of Invention
The application provides a converter, a vaporization cooling flue of the converter, and a system and a method for recovery pretreatment of converter gas, which are used for solving the problems of insufficient recovery of the converter gas and low gas heat value of the converter gas.
In order to achieve the above purpose, the present application provides the following technical solutions:
in a first aspect, the application provides a converter vaporization cooling flue capable of improving the recovery amount of converter gas, which comprises a movable smoke hood, a fire hole fixed section flue, a middle section flue and a tail end flue; the movable smoke hood is positioned above a converter mouth, the upper part of the movable smoke hood is connected with the lower part of a fixed section flue of the converter mouth, the upper part of the fixed section flue of the converter mouth is connected with the lower part of a middle section flue through a sealed telescopic connecting device, and the upper part of the middle section flue is connected with the tail end flue;
at least one section of flue among the flue at the fixed section of the furnace mouth, the flue at the middle section and the flue at the tail end is connected with a carbon conveying system, the carbon conveying system sprays dry quenching dust removal ash into the flue connected with the carbon conveying system, carbon dioxide and oxygen in converter gas entering a converter vaporization cooling flue react with the dry quenching dust removal ash respectively to generate carbon monoxide, and the particle size range of the dry quenching dust removal ash is 200-300 meshes; the carbon conveying system sprays the dry quenching dust-removing ash into a flue with the temperature range of 900-1600 ℃.
Further, the reaction temperature range of the dry quenching dust ash and the carbon dioxide and oxygen in the converter gas is 900-1600 ℃.
Further, the carbon conveying system comprises a carbon storage bin, a pneumatic ash conveying device, intelligent carbon fixing skid-mounted equipment, a high-speed spray gun and a control device; the carbon storage bin is used for storing dry quenching dust removal ash, and the pneumatic ash conveying device is used for conveying the dry quenching dust removal ash in the carbon storage bin to the intelligent carbon determination skid-mounted equipment.
Furthermore, the intelligent carbon-fixing skid-mounted equipment comprises a quantitative powder conveying device, an air flow conveying device, a powder distribution device, a temperature-measuring anti-blocking device and a detection device; the quantitative powder conveying device receives the dry quenching dust removal ash from the pneumatic ash conveying device and quantitatively conveys the dry quenching dust removal ash to the powder distribution device; a plurality of powder conveying channels are arranged in the powder distribution device, and the outlet end of each powder conveying channel is communicated with the converter vaporization cooling flue; the air flow conveying device is matched with the powder distribution device and used for blowing dry quenching dust in each powder conveying channel to a converter vaporization cooling flue.
Furthermore, the temperature measurement anti-blocking device is used for measuring the temperature in the powder conveying channel in real time so as to obtain the unobstructed state of the pipeline of the powder conveying channel.
Furthermore, the detection device is used for detecting the flue gas flow, the flue gas components and the flue gas temperature in the converter.
Further, the control device is used for receiving various data measured by the detection device and adjusting the operation states of the quantitative powder conveying device, the airflow conveying device and the powder distribution device according to the received data.
Furthermore, the outlet end of each powder conveying channel in the powder distribution device is provided with one high-speed spray gun, and the high-speed spray guns spray the dry quenching dust in the powder conveying channels into the vaporization cooling flue of the converter.
In a second aspect, the application provides a converter gas recovery pretreatment system arranged on a converter vaporization cooling flue, wherein the converter gas recovery pretreatment system comprises the converter vaporization cooling flue and a carbon conveying system arranged on the converter vaporization cooling flue; and the carbon conveying system blows the dry quenching dust removal ash into a converter vaporization cooling flue, so that carbon dioxide and oxygen in converter gas respectively react with the dry quenching dust removal ash in the flue at the temperature of 900-1600 ℃ to generate carbon monoxide.
In the technical scheme, the carbon conveying system comprises a carbon storage bin, a pneumatic ash conveying device, intelligent carbon determination skid-mounted equipment, a high-speed spray gun and a control device; the carbon storage bin is used for storing dry quenching dust removal ash, and the pneumatic ash conveying device is used for conveying the dry quenching dust removal ash in the carbon storage bin to the intelligent carbon determination skid-mounted equipment.
Furthermore, the intelligent carbon-fixing skid-mounted equipment comprises a quantitative powder conveying device, an air flow conveying device, a powder distribution device, a temperature-measuring anti-blocking device and a detection device; the pneumatic ash conveying device conveys the dry quenching dust removal ash to the quantitative powder conveying device, and the quantitative powder conveying device conveys the dry quenching dust removal ash to the powder distribution device in a quantitative mode; a plurality of powder conveying channels are arranged in the powder distribution device, and the outlet end of each powder conveying channel is communicated with a converter vaporization cooling flue; the air flow conveying device is matched with the powder distribution device and used for blowing dry quenching dust in each powder conveying channel to a converter vaporization cooling flue.
Furthermore, the temperature measurement anti-blocking device is used for measuring the temperature in the powder conveying channel in real time to obtain the unobstructed state of the pipeline of the powder conveying channel; the detection device is used for detecting the flue gas flow, the flue gas components and the flue gas temperature in the converter.
Further, the control device is used for receiving various data measured by the detection device and adjusting the operation states of the quantitative powder conveying device, the airflow conveying device and the powder distribution device according to the received data.
Furthermore, the outlet end of each powder conveying channel in the powder distribution device is provided with one high-speed spray gun, and the high-speed spray gun sprays the dry quenching dust in the powder conveying channels into the vaporization cooling flue of the converter.
In a third aspect, the present application provides a method for increasing the recovery of converter gas, comprising: connecting a carbon conveying system with a converter vaporization cooling flue, wherein the carbon conveying system sprays dry quenching dust in the converter vaporization cooling flue; carbon dioxide and oxygen in the converter gas react with the dry quenching dust in a flue at the temperature of 900-1600 ℃ respectively to generate carbon monoxide.
In a further aspect of the above technical solution, a high-speed spray gun is disposed at an outlet end of the carbon delivery system, and the dry quenching fly ash is sprayed into a converter vaporization cooling flue through the high-speed spray gun.
Further, the particle size range of the dry quenching dust removal ash is 200-300 meshes.
The fourth aspect, this application provides a can promote converter of converter coal gas recovery volume, the fire door top of converter is provided with foretell converter vaporization cooling flue, converter vaporization cooling flue links to each other with carbon conveying system, carbon conveying system to it is 200 meshes ~ 300 mesh dry coke quenching fly ash to spray the particle size scope in the converter vaporization cooling flue, carbon conveying system will dry coke quenching fly ash spray in the flue that the temperature range is 900 ~ 1600 ℃, carbon dioxide and oxygen in the converter coal gas respectively with dry coke quenching fly ash reaction generates carbon monoxide.
Compared with the prior art, the method has the following beneficial effects:
1. the application provides a can promote converter vaporization cooling flue of converter gas recovery volume, this converter vaporization cooling flue links to each other with carbon conveying system, and carbon conveying system sprays the dry coke quenching fly ash in to the flue rather than linking to each other, get into the converter gas of converter vaporization cooling flue in carbon dioxide and oxygen respectively with the dry coke quenching fly ash reaction generates carbon monoxide. In the prior art, the converter gas is conveyed and recovered by the converter vaporization cooling flue, the content of carbon dioxide and oxygen in the converter gas is high, and the high content of oxygen causes direct emission of the converter gas, wastes energy, increases carbon emission of enterprises and aggravates greenhouse effect. The converter vaporization cooling flue provided by the application is connected with the carbon conveying system, so that converter gas in the converter vaporization cooling flue reacts with dry quenching fly ash in a flue high-temperature environment, carbon dioxide and oxygen in the converter gas react into recyclable carbon monoxide by using the dry quenching fly ash, the calorific value of the converter gas is improved, the content of the carbon dioxide and the oxygen is reduced, the recovery amount of the converter gas to the carbon monoxide is improved, and the recovery quality of the converter gas is improved. Moreover, the oxygen content is reduced, the explosion risk is also reduced, and the dry quenching dust removal ash utilizes the high-temperature environment of the flue to complete the reaction, thereby realizing the utilization of heat in the converter gas.
2. In the converter vaporization cooling flue that can promote converter gas recovery volume, what take place the reaction respectively with carbon dioxide and oxygen in the converter gas is the dry coke quenching fly ash, and the dry coke quenching fly ash is the coking dust removal waste matter that the coke-oven plant produced, and this application uses the secondary utilization that the waste matter has been realized as the reaction carbon source to the dry coke quenching fly ash, changing waste into valuables, has reduced manufacturing cost, has realized energy saving and emission reduction.
3. The application also provides a converter gas recovery pretreatment system installed on the converter vaporization cooling flue, the converter gas recovery system in the prior art sequentially feeds converter gas discharged from the converter vaporization cooling flue into a primary dust removal system and a gas holder, the primary dust removal system and the gas holder form a post-treatment recovery system for the converter gas, and the converter gas in the converter vaporization cooling flue contains carbon dioxide and oxygen with relatively high content, so that the recovery quality of the converter gas is not high, the carbon dioxide emission is high, and certain explosion risk exists if the oxygen content is high, so that the post-treatment recovery system for the converter gas diffuses the part of the gas, and the carbon emission of the steelmaking process is increased. The converter gas recovery pretreatment system arranged on the converter vaporization cooling flue can treat the converter gas in one step before the converter gas enters the post-treatment recovery system so as to improve the recovery quality and recovery quantity of the converter gas. Specifically, this application is through letting in the dry quenching dust removal ash to converter vaporization cooling flue in, utilize flue high temperature simultaneously, carbon dioxide and oxygen react with the dry quenching dust removal ash respectively in the realization converter coal gas, generate the carbon monoxide of target recovery, the content of carbon monoxide has been promoted, the content of carbon dioxide and oxygen has been reduced simultaneously, the recovery quality of converter coal gas has been promoted promptly, the recovery volume of converter coal gas has been promoted, the while has reduced the chimney and has been put the gas volume, the explosion risk has been reduced, the carbon emission volume of steelmaking process has been reduced.
4. The method mainly comprises the steps of introducing dry quenching fly ash into a converter vaporization cooling flue, and simultaneously utilizing the high temperature of the flue to realize that carbon dioxide and oxygen in the converter gas respectively react with the dry quenching fly ash to generate target recovered carbon monoxide, thereby realizing the improvement of the recovery of the converter gas, simultaneously improving the heat value of the converter gas and improving the recovery quality of the converter gas.
5. Based on the converter vaporization cooling flue capable of improving the converter gas recovery amount, the application provides a converter capable of improving the converter gas recovery amount, the converter vaporization cooling flue of the converter is connected with a carbon conveying system, the carbon conveying system sprays dry quenching dust removal ash into the converter vaporization cooling flue, carbon dioxide and oxygen in the converter gas respectively react with the dry quenching dust removal ash to generate carbon monoxide, and the converter can improve the converter gas recovery amount and improve the recovery quality of the converter gas.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts. It should be understood that the specific shapes, configurations, shown in the drawings, are not generally considered limitations on the practice of the present application; for example, it is within the ability of those skilled in the art to make routine adjustments or further optimizations based on the technical concepts disclosed in the present application and the exemplary drawings, for the increase/decrease/attribution of certain units (components), specific shapes, positional relationships, connection manners, dimensional ratios, and the like.
FIG. 1 is a graph showing the free energy generation trend of various reactions of dry quenched fly ash and converter gas in a flue at different temperatures;
FIG. 2 shows CO in flue gas after three carbons of 100 meshes, 200 meshes and 300 meshes react with converter flue gas at 1000 DEG C 2 The change curve of the content and the CO content;
FIG. 3 shows that three kinds of carbon of 100 meshes, 200 meshes and 300 meshes react with the flue gas of the converter at 1100 ℃ to form CO in the flue gas 2 The variation curve of the content and the CO content;
FIG. 4 shows that the CO in the flue gas after the three carbons of 100 meshes, 200 meshes and 300 meshes react with the flue gas of the converter at 1200 DEG C 2 The change curve of the content and the CO content;
FIG. 5 shows 100 mesh and 200 meshAnd the CO in the flue gas after the reaction of three 300-mesh carbons and the converter flue gas at 1250 DEG C 2 The variation curve of the content and the CO content;
fig. 6 is a schematic diagram of a structure of a converter vaporization cooling flue capable of increasing a converter gas recovery amount provided by the present application in an embodiment, in which a converter, a converter vaporization cooling flue, and a carbon delivery system are illustrated, which can be used to embody a process principle of increasing a converter gas recovery amount.
Description of the reference numerals:
1. a converter; 2. a converter vaporization cooling flue; 21. a movable smoke hood; 22. a flue of the furnace mouth fixing section; 23. a middle section flue; 24. a tail end flue; 3. a carbon delivery system; 31. a carbon storage bin; 32. a pneumatic ash conveying device; 33. intelligent carbon determination skid-mounted equipment; 34. a high-speed spray gun.
Detailed Description
The present application will be described in further detail below with reference to specific embodiments thereof, with reference to the accompanying drawings.
In the description of the present application: "plurality" means two or more unless otherwise specified. The terms "first", "second", "third", and the like in this application are intended to distinguish one referenced item from another without having a special meaning in technical connotation (e.g., should not be construed as emphasizing a degree or order of importance, etc.). The terms "comprising," "including," "having," and the like, are intended to be inclusive and mean "not limited to" (some elements, components, materials, steps, etc.).
In the present application, terms such as "upper", "lower", "left", "right", "middle", and the like are generally used for easy visual understanding with reference to the drawings, and are not intended to absolutely limit the positional relationship in an actual product. Changes in these relative positional relationships without departing from the technical concepts disclosed in the present application should also be considered as the scope of the present application.
With the increasing demand of the steel industry on energy conservation and environmental protection, the recovery of converter gas becomes an important index for measuring the energy conservation and environmental protection level of a metallurgical enterprise. How to carry out the ultimate recovery and the effective utilization of the converter gas is of great importance to the energy conservation and consumption reduction of enterprises and the benefit improvement. The recovery amount of steel per ton is low, the emission amount is large, the energy is wasted, and the environment is seriously polluted. How to improve the recovery amount of converter gas per ton steel, stably maintain a high-level recovery state, solve a series of contradictions such as unbalanced supply and demand and the like has become a difficult problem to be urgently solved.
Aims to solve the problems of low coal gas recovery quantity, low coal gas recovery quality and large diffusion quantity. The application reduces the flue gas O of the converter 2 Content, reduction of CO 2 The content and the CO content are improved, and the purposes of enhancing the efficiency, reducing the emission and utilizing the waste are realized by adding dry quenching dust in the converter flue gas to reduce the carbon.
Compared with the anthracite, the composition properties of the dry quenching dust removal ash are very similar to those of the anthracite from the perspective of industrial analysis, and the dry quenching dust removal ash has the characteristics of high fixed carbon content, low volatile component, low sulfur content and the like, and the dry quenching dust removal ash is used as a carbon source, so that the recovery quantity of converter gas is improved, and the carbon supply cost is also reduced.
Converter gas is a by-product of the converter steelmaking process, and is a mixed gas of carbon monoxide and a small amount of carbon dioxide generated by carbon in molten iron at a high temperature and oxygen blown in during the converter steelmaking process. The components of the converter gas are changed continuously along with the smelting process, and the main components can be seen in the following table 1:
TABLE 1 converter gas main component and its content ratio
The main smoke component in the converter gas is carbon monoxide, and in order to achieve the safety index of converter gas recovery, the temperature and the concentration of the converter gas are not in the range of ignition point and explosion limit concentration, namely the O in the converter gas needs to be reduced 2 And CO 2 The content of (b).
Example one
At high temperature (1600-1800 ℃) and high dust (80-150 g/Nm) of the flue gas of the converter 3 ) High content of CO (0-80%), periodic smelting, etc., for realizing energy conservation and emission reduction and improving coal gas returnThe application provides a brand-new carbon reduction technology by using carbon, namely before the converter gas is recovered, the high temperature of a flue is utilized to react and drop O in the converter gas through dry quenching dust removal ash 2 And CO 2 To quickly reduce O in converter gas 2 And CO 2 The content of the (D) ensures that the temperature and the concentration of the converter gas are not in the range of ignition point and explosion limit concentration; meanwhile, CO generated by the reaction also improves the recovery amount of coal gas.
The method for improving the recovery amount and the heat value of the converter gas and reducing the discharge amount of carbon dioxide in the converter flue gas mainly comprises the steps of introducing dry quenching dedusting ash into a converter vaporization cooling flue, and simultaneously realizing the reaction of carbon dioxide and oxygen in the converter gas and the dry quenching dedusting ash respectively by utilizing the high temperature of the flue. The method realizes the aims of increasing the coal gas recovery quantity, improving the coal gas recovery quality and reducing the carbon emission only by slightly changing the vaporization cooling flue under the condition of not changing the smelting process of the converter. After carbon dioxide and oxygen in the converter gas respectively react with the dry quenching dust, target recovered carbon monoxide is generated, the content of the carbon monoxide is increased, and the content of the carbon dioxide and the content of the oxygen are reduced, namely, the recovery quality of the converter gas is improved, the recovery amount of the converter gas is increased, the amount of the coal gas discharged from a chimney is reduced, the explosion risk is reduced, and the carbon emission amount of a steelmaking process is reduced.
The dry quenching dust in the flue reacts with converter gas as follows:
C (s) +CO 2(g) ＝2CO (g) Δ r1 G θ ＝166550-171.00T J·mol -1
2C (s) +O 2(g) ＝2CO (g) Δ r2 G θ ＝-228800-171.54T J·mol -1
C (s) +O 2(g) ＝CO 2(g) Δ r3 G θ ＝-395350-0.54T J·mol -1
2CO (g) +O 2(g) ＝2CO 2(g) Δ r4 G θ ＝-561900-170.46T J·mol -1
since the reaction of the dry quenched fly ash with the converter gas is carried out in the converter evaporative cooling flue, neither the temperature nor the gas composition is in a standard state. Therefore, the change in gibbs free energy (Δ G) of the reaction under actual conditions should be used to judge the reaction condition, and the chemical reaction isotherm equation is as follows:
as the reaction is carried out in the vaporization flue, the total pressure can be approximate to a standard atmospheric pressure, and corresponding Gibbs free energy changes are respectively calculated according to the components of the converter flue gas as shown in the following table 2:
TABLE 2 Gibbs free energy Change of reaction of each reaction of Dry quenched fly ash and converter gas in flue
The corresponding Gibbs free energy function images of each reaction at different temperatures are shown in figure 1, figure 1 reflects the free energy generation trend of each reaction at different temperatures, and as can be seen from figure 1, C and CO are present in a flue at 900-1600 ℃ in a converter vaporization flue 2 The reaction of (3) is more easily carried out.
The inventor selects the grain size of the carbon source through experiments, and the specific process is as follows:
three kinds of carbon of 100 meshes (149 mu m), 200 meshes (74 mu m) and 300 meshes (48 mu m) are used as raw materials, CO in the flue gas after the reaction with the converter flue gas under the same conditions (isothermal 1000 ℃, 1100 ℃, 1200 ℃ and 1250 ℃), wherein 2 The variation curves of the contents and the CO contents are shown in FIGS. 2, 3, 4 and 5.
As can be seen from fig. 2 to 5, when the particle size of the carbon particles is increased to 200 to 300 mesh in the high-temperature flue gas of the converter, the reaction efficiency is high.
The following table 3 shows the components of the dry quenching dust ash discharged from various enterprises during the production process:
TABLE 3 composition of dry quenched fly ash discharged from several enterprises in the production process
The following table 4 shows the particle size distribution ratio of fly ash:
TABLE 4 particle size distribution ratio table for fly ash
When the inventor selects a carbon source in the particle size range of 200-300 meshes, the particle size of the dry quenching dust is found to be just in the range, the dry quenching dust can be used as the carbon source to complete the reaction of carbon dioxide and oxygen in converter gas, the secondary utilization of waste is realized, and the carbon cost is reduced.
According to the method provided by the embodiment, the dry quenching fly ash is mainly introduced into the converter vaporization cooling flue, and simultaneously, the high temperature of the flue is utilized to realize that carbon dioxide and oxygen in converter gas respectively react with the dry quenching fly ash to generate target recovered carbon monoxide, so that the recovery amount and the heat value of the converter gas are improved, and the recovery quality of the converter gas is improved.
Example two
Based on the method for improving the recovery amount of the converter gas provided by the embodiment, the embodiment of the application provides a converter vaporization cooling flue capable of improving the recovery amount of the converter gas. Referring to fig. 6, the converter vaporization cooling flue of fig. 6 is illustrated in a simplified manner, and the converter vaporization cooling flue 2 includes a movable smoke hood 21, a fire hole fixed section flue 22, a middle section flue 23 and a tail end flue 24; the movable smoke hood 21 is positioned above a converter mouth, the upper part of the movable smoke hood 21 is connected with the lower part of a fixed section flue 22 of the converter mouth, the upper part of the fixed section flue 22 of the converter mouth is connected with the lower part of a middle section flue 23 through a sealed telescopic connecting device, and the upper part of the middle section flue 23 is connected with a tail end flue 24. At least one section of flue among the fixed section flue of the furnace mouth, the middle section flue and the tail end flue is connected with the carbon conveying system 3. The carbon conveying system sprays dry quenching dust removal ash into a flue connected with the carbon conveying system, and carbon dioxide and oxygen in converter gas entering the converter vaporization cooling flue respectively react with the dry quenching dust removal ash to generate carbon monoxide. Preferably, in order to promote the reaction to fully occur, the carbon conveying system sprays the dry quenching dust in a flue with the temperature ranging from 900 ℃ to 1600 ℃ so that the reaction temperature of the dry quenching dust and the carbon dioxide and the oxygen in the converter gas ranges from 900 ℃ to 1600 ℃. The spraying direction of the dry quenching dust is consistent with the flowing direction of the converter gas in the flue, and the spraying direction of a plurality of quenching dust is opposite to the flowing direction of the converter gas in the flue, so that the smelting discharge of converter flue gas in the converter vaporization cooling flue can be influenced.
In one embodiment, the particle size of the dry quenching dust is in the range of 100 mesh to 300 mesh. Preferably, the particle size of the dry quenching dust removal ash is in a range of 200 meshes to 300 meshes, such as 250 meshes, 270 meshes and the like. The application selects the dry quenching dust-removal ash as the carbon source, so that the carbon cost is reduced, the solid waste is treated, and the energy conservation and emission reduction are realized.
In one embodiment, the carbon delivery system 3 connected to the flue may include a carbon storage bin 31, a pneumatic ash handling device 32, an intelligent carbon sequestration skid 33, a high-speed lance 34, and a control device. Wherein: the carbon storage bin 31 is used for storing dry quenching dust, and the pneumatic ash conveying device 32 is used for conveying the dry quenching dust in the carbon storage bin 31 to the intelligent carbon-fixing skid-mounted device 33. The intelligent carbon determination skid-mounted equipment (the specification model can be BF-T120) comprises a quantitative powder conveying device, an air flow conveying device, a powder distribution device, a temperature measurement anti-blocking device and a detection device; the quantitative powder conveying device receives the dry quenching dust removal ash from the pneumatic ash conveying device and quantitatively conveys the dry quenching dust removal ash to the powder distribution device; a plurality of powder conveying channels are arranged in the powder distribution device, and the outlet end of each powder conveying channel is communicated with the converter vaporization cooling flue; the air flow conveying device is matched with the powder distribution device and used for blowing the dry quenching dust ash in each powder conveying channel to the evaporation cooling flue of the converter. The temperature measurement anti-blocking device is used for measuring the temperature in the powder conveying channel in real time so as to obtain the unobstructed state of the pipeline of the powder conveying channel, and the powder conveying channel can be cleaned by the pipeline soot blower when the powder conveying channel is blocked. The detection device is used for detecting the flue gas flow, the flue gas components and the flue gas temperature in the converter. The control device is used for receiving various data measured by the detection device and adjusting the running states of the quantitative powder conveying device, the airflow conveying device and the powder distribution device according to the received data. The outlet end of each powder conveying channel in the powder distribution device is provided with a high-speed spray gun, and the high-speed spray gun sprays dry quenching dust in the powder conveying channels into a converter vaporization cooling flue.
The application provides a can promote converter vaporization cooling flue of converter coal gas recovery volume links to each other with carbon conveying system, and carbon conveying system sprays the dry coke quenching fly ash in to the flue rather than linking to each other, get into the carbon dioxide and the oxygen in the converter coal gas of converter vaporization cooling flue respectively with the reaction of dry coke quenching fly ash generates carbon monoxide.
In the prior art, the converter gas is conveyed and recovered by the converter vaporization cooling flue, the content of carbon dioxide and oxygen in the converter gas is high, and the high content of oxygen causes direct emission of the converter gas, wastes energy, increases carbon emission of enterprises and aggravates greenhouse effect. The converter vaporization cooling flue provided by the application is connected with the carbon conveying system, so that converter gas and dry quenching fly ash in the converter vaporization cooling flue are subjected to endothermic reaction in a flue high-temperature environment, carbon dioxide and oxygen in the converter gas are reacted into recyclable carbon monoxide by using the dry quenching fly ash, the content of the carbon dioxide and the content of the oxygen are reduced, the recovery amount of the converter gas to the carbon monoxide is increased, and the recovery quality of the converter gas is improved. Moreover, the oxygen content is reduced, the explosion risk is also reduced, and the dry quenching dust removal ash completes the reaction by utilizing the high-temperature environment of the flue, so that the heat in the converter gas is utilized.
In the converter vaporization cooling flue that can promote converter gas recovery volume that this application provided, with carbon dioxide in the converter gas and oxygen take place the reaction respectively be the dry coke quenching fly ash, the dry coke quenching fly ash is the coking dust removal waste matter that the coke-oven plant produced, this application uses the dry coke quenching fly ash as the carbon source and has realized the reutilization of waste material, has reduced manufacturing cost, has realized energy saving and emission reduction.
EXAMPLE III
Based on the method for improving the recovery amount of the converter gas provided by the embodiment, the embodiment of the application provides a converter gas recovery pretreatment system arranged on a converter vaporization cooling flue. The converter gas recovery pretreatment system comprises a converter vaporization cooling flue and a carbon conveying system arranged on the converter vaporization cooling flue. The carbon conveying system blows the dry quenching dust-removal ash into a converter vaporization cooling flue, so that carbon dioxide and oxygen in converter gas respectively react with the dry quenching dust-removal ash in the flue with the temperature range of 900-1600 ℃ to generate carbon monoxide.
In one embodiment, the carbon conveying system comprises a carbon storage bin, a pneumatic ash conveying device, an intelligent fixed carbon skid device, a high-speed spray gun and a control device. The carbon storage bin is used for storing dry quenching dust removal ash, and the pneumatic ash conveying device is used for conveying the dry quenching dust removal ash in the carbon storage bin to the intelligent carbon fixing skid-mounted equipment. The carbon transfer system provided in this example is the same as the carbon transfer system described in the second example.
The application provides a processing system before converter gas recovery is when putting into use, can adopt the tank car to transport the dry coke quenching fly ash to storing up the carbon storehouse and store, carry the ash powder to the intelligence through the strength ash handling device and decide in the carbon skid-mounted equipment, set up quantitative powder conveyor in the intelligence decides carbon skid-mounted equipment, the air current conveyor, the powder distributor, the stifled device is prevented in the temperature measurement, detecting instrument and meter etc. through the interlocking control with converter smelting situation, the flue gas flow, the flue gas composition, flue gas temperature isoparametric, make the dry coke quenching fly ash spout converter vaporization flue at a high speed, in order to improve the recovery yield and the recovery quality of converter gas.
The converter gas discharged from a rotary furnace vaporization cooling flue is sequentially fed into a primary dust removal system and a gas holder, the primary dust removal system and the gas holder form a post-treatment recovery system for the converter gas, and the converter gas in the rotary furnace vaporization cooling flue contains carbon dioxide and oxygen with relatively high content, so that the recovery quality of the converter gas is not high, the carbon dioxide emission is high, and the oxygen content is high, so that certain explosion risk exists, the part of gas is diffused, and the carbon emission of a steelmaking process is increased. The converter gas recovery pretreatment system arranged on the converter vaporization cooling flue can treat the converter gas in one step before the converter gas enters the post-treatment recovery system so as to improve the recovery quality and recovery quantity of the converter gas. Specifically, this application is through letting in the dry coke quenching fly ash to converter vaporization cooling flue in, utilize flue high temperature simultaneously, carbon dioxide and oxygen react with the dry coke quenching fly ash respectively in the realization converter coal gas, generate the carbon monoxide of target recovery, the content of carbon monoxide has been promoted, the content of carbon dioxide and oxygen has been reduced simultaneously, the recovery quality of converter coal gas has been promoted promptly, the recovery volume of converter coal gas has been promoted, the gas volume that diffuses of chimney has been reduced simultaneously, the explosion risk has been reduced, the carbon emission volume of steelmaking process has been reduced.
Example four
Based on the converter vaporization cooling flue capable of improving the converter gas recovery amount, the embodiment of the application provides a converter capable of improving the converter gas recovery amount, the converter vaporization cooling flue is arranged above a converter mouth of the converter, the converter vaporization cooling flue is connected with a carbon conveying system, the carbon conveying system sprays dry quenching dust in the converter vaporization cooling flue, and carbon dioxide and oxygen in the converter gas respectively react with the dry quenching dust to generate carbon monoxide. The application of the converter can improve the recovery amount of the converter gas and the recovery quality of the converter gas.
The converter provided by the embodiment can be manufactured by simple modification, the smelting process of the converter is not changed in the modification process, and only the vaporization cooling flue is slightly modified, namely the vaporization cooling flue is connected with the carbon conveying system, and the dry quenching dust removal ash is sprayed to the vaporization cooling flue through the carbon conveying system, so that the aims of increasing the recovery amount of coal gas, improving the recovery quality of the coal gas and reducing the carbon emission can be fulfilled.
The inventor obtains through calculation that the carbon reduction technology is implemented in a converter vaporization cooling flue before converter gas recovery, under the standard condition, the converter gas recovery amount can be increased by 10%, the gas recovery time can be increased by 60s, the gas heat value can be increased by more than 10%, the carbon emission per ton of steel can be reduced by 10kg per year, the solid waste (dry quenching dust) per ton of steel can be treated by 2.5kg per year, and the annual benefit is 5-8 yuan per ton of steel.
The method capable of improving the coal gas recovery quantity of the converter is based on the original converter, normal operation of an original converter smelting production system is not affected, the coal gas recovery quantity of the converter is improved through modification of a converter vaporization cooling flue of the original converter, and construction cost and operation cost are reduced.
All the technical features of the above embodiments can be arbitrarily combined (as long as there is no contradiction between the combinations of the technical features), and for brevity of description, all the possible combinations of the technical features in the above embodiments are not described; these examples, which are not explicitly described, should be considered to be within the scope of the present description.
The present application has been described in considerable detail with reference to certain embodiments and examples thereof. It should be understood that several conventional adaptations or further innovations of these specific embodiments may also be made based on the technical idea of the present application; however, such conventional modifications and further innovations can also fall into the scope of the claims of the present application as long as they do not depart from the technical idea of the present application.
Claims (9)
1. A converter vaporization cooling flue capable of improving the recovery of converter gas is characterized by comprising a movable smoke hood, a fire hole fixed section flue, a middle section flue and a tail end flue; the movable smoke hood is positioned above a converter mouth, the upper part of the movable smoke hood is connected with the lower part of a fixed section flue of the converter mouth, the upper part of the fixed section flue of the converter mouth is connected with the lower part of a middle section flue through a sealed telescopic connecting device, and the upper part of the middle section flue is connected with the tail end flue;
at least one section of flue among the flue at the fixed section of the furnace mouth, the flue at the middle section and the flue at the tail end is connected with a carbon conveying system, the carbon conveying system sprays dry quenching dust removal ash into the flue connected with the carbon conveying system, carbon dioxide and oxygen in converter gas entering a converter vaporization cooling flue react with the dry quenching dust removal ash respectively to generate carbon monoxide, and the particle size range of the dry quenching dust removal ash is 200-300 meshes;
the carbon conveying system sprays the dry quenching dust-removing ash into a flue with the temperature range of 900-1600 ℃.
2. The converter vaporization cooling flue capable of improving the recovery of converter gas according to claim 1, wherein the reaction temperature of the dry quenching fly ash and the carbon dioxide and oxygen in the converter gas ranges from 900 ℃ to 1600 ℃.
3. The converter vaporization cooling flue capable of improving the recovery of converter gas as claimed in claim 1, wherein the carbon conveying system comprises a carbon storage bin, a pneumatic ash conveying device, an intelligent carbon-fixing skid-mounted device, a high-speed spray gun and a control device; the carbon storage bin is used for storing dry quenching dust removal ash, and the pneumatic ash conveying device is used for conveying the dry quenching dust removal ash in the carbon storage bin to the intelligent carbon determination skid-mounted equipment;
the intelligent carbon determination skid-mounted equipment comprises a quantitative powder conveying device, an air flow conveying device, a powder distribution device, a temperature measurement anti-blocking device and a detection device; the quantitative powder conveying device receives the dry quenching dust removal ash from the pneumatic ash conveying device and quantitatively conveys the dry quenching dust removal ash to the powder distribution device; a plurality of powder conveying channels are arranged in the powder distribution device, and the outlet end of each powder conveying channel is communicated with the converter vaporization cooling flue; the air flow conveying device is matched with the powder distribution device and used for blowing dry quenching dust in each powder conveying channel to a converter vaporization cooling flue;
the temperature measurement anti-blocking device is used for measuring the temperature in the powder conveying channel in real time to obtain the unobstructed state of the pipeline of the powder conveying channel;
the detection device is used for detecting the flue gas flow, the flue gas components and the flue gas temperature in the converter;
the control device is used for receiving various data measured by the detection device and adjusting the operation states of the quantitative powder conveying device, the airflow conveying device and the powder distribution device according to the received data.
4. The converter evaporative cooling flue capable of improving the recovery of converter gas as claimed in claim 3, wherein the outlet end of each powder conveying channel in the powder distribution device is provided with one high-speed spray gun, and the high-speed spray gun sprays dry quenching fly ash in the powder conveying channel into the converter evaporative cooling flue.
5. A converter gas recovery pretreatment system arranged on a converter vaporization cooling flue is characterized in that the converter vaporization cooling flue is the converter vaporization cooling flue capable of improving the recovery amount of the converter gas in claim 1;
the converter gas recovery pretreatment system comprises a converter vaporization cooling flue and a carbon conveying system arranged on the converter vaporization cooling flue; and the carbon conveying system blows the dry quenching dust removal ash into a converter vaporization cooling flue, so that carbon dioxide and oxygen in converter gas respectively react with the dry quenching dust removal ash in the flue at the temperature of 900-1600 ℃ to generate carbon monoxide.
6. The converter gas recovery pretreatment system installed on a converter vaporization cooling flue according to claim 5, wherein the carbon delivery system comprises a carbon storage bin, a pneumatic ash conveying device, an intelligent fixed carbon skid device, a high-speed spray gun and a control device; the carbon storage bin is used for storing dry quenching dust, and the pneumatic ash conveying device is used for conveying the dry quenching dust in the carbon storage bin to the intelligent carbon determination skid-mounted equipment;
the intelligent carbon determination skid-mounted equipment comprises a quantitative powder conveying device, an air flow conveying device, a powder distribution device, a temperature measurement anti-blocking device and a detection device; the pneumatic ash conveying device conveys the dry quenching dust removal ash to the quantitative powder conveying device, and the quantitative powder conveying device conveys the dry quenching dust removal ash to the powder distribution device in a quantitative manner; a plurality of powder conveying channels are arranged in the powder distribution device, and the outlet end of each powder conveying channel is communicated with the converter vaporization cooling flue; the air flow conveying device is matched with the powder distribution device and used for blowing dry quenching dust in each powder conveying channel to a converter vaporization cooling flue;
the temperature measurement anti-blocking device is used for measuring the temperature in the powder conveying channel in real time to obtain the unobstructed state of the pipeline of the powder conveying channel; the detection device is used for detecting the flue gas flow, the flue gas components and the flue gas temperature in the converter;
the control device is used for receiving various data measured by the detection device and adjusting the running states of the quantitative powder conveying device, the airflow conveying device and the powder distribution device according to the received data;
the high-speed spray gun is arranged at the outlet end of each powder conveying channel in the powder distribution device, and the high-speed spray gun sprays dry quenching and dedusting ash in the powder conveying channels into a converter vaporization cooling flue.
7. A method for improving the recovery of converter gas is characterized by comprising the following steps: connecting a carbon conveying system with a converter vaporization cooling flue, wherein the carbon conveying system sprays dry quenching dust in the converter vaporization cooling flue; carbon dioxide and oxygen in the converter gas react with the dry quenching dust-removal ash in a flue with the temperature range of 900-1600 ℃ respectively to generate carbon monoxide.
8. The method for improving the recovery of converter gas according to claim 7, wherein a high-speed spray gun is arranged at the outlet end of the carbon delivery system, and the dry quenching fly ash is sprayed into a converter vaporization cooling flue through the high-speed spray gun;
the particle size range of the dry quenching dust removal ash is 200-300 meshes.
9. The converter capable of improving the recovery amount of converter gas is characterized in that a converter vaporization cooling flue capable of improving the recovery amount of converter gas in claim 1 is arranged above a converter mouth of the converter, the converter vaporization cooling flue is connected with a carbon conveying system, the carbon conveying system sprays dry quenching fly ash with the particle size range of 200 meshes to 300 meshes into the converter vaporization cooling flue, the carbon conveying system sprays the dry quenching fly ash into a flue with the temperature range of 900 ℃ to 1600 ℃, and carbon dioxide and oxygen in the converter gas react with the dry quenching fly ash respectively to generate carbon monoxide.
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| CN116855669A (en) * | 2023-07-25 | 2023-10-10 | 河北富莱尔环保节能工程有限公司 | Steelmaking method and system for improving flue safety and gas calorific value |
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