CN113025776A - Converter primary flue gas full-dry dedusting and energy full-recovery system - Google Patents
Converter primary flue gas full-dry dedusting and energy full-recovery system Download PDFInfo
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- CN113025776A CN113025776A CN202110212669.7A CN202110212669A CN113025776A CN 113025776 A CN113025776 A CN 113025776A CN 202110212669 A CN202110212669 A CN 202110212669A CN 113025776 A CN113025776 A CN 113025776A
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 239000003546 flue gas Substances 0.000 title claims abstract description 37
- 238000011084 recovery Methods 0.000 title claims abstract description 32
- 239000000428 dust Substances 0.000 claims abstract description 70
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000001301 oxygen Substances 0.000 claims abstract description 18
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 18
- 239000002912 waste gas Substances 0.000 claims abstract description 15
- 238000001816 cooling Methods 0.000 claims abstract description 14
- 239000003034 coal gas Substances 0.000 claims description 42
- 239000007789 gas Substances 0.000 claims description 32
- 238000003860 storage Methods 0.000 claims description 13
- 238000009834 vaporization Methods 0.000 claims description 5
- 230000008016 vaporization Effects 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 4
- 239000000779 smoke Substances 0.000 abstract description 20
- 239000002918 waste heat Substances 0.000 abstract description 12
- 238000003723 Smelting Methods 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 9
- 238000001704 evaporation Methods 0.000 abstract description 6
- 230000008020 evaporation Effects 0.000 abstract description 6
- 239000002245 particle Substances 0.000 abstract description 5
- 230000015271 coagulation Effects 0.000 abstract description 4
- 238000005345 coagulation Methods 0.000 abstract description 4
- 238000004581 coalescence Methods 0.000 abstract 1
- 239000007792 gaseous phase Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 18
- 238000005516 engineering process Methods 0.000 description 12
- 230000008901 benefit Effects 0.000 description 11
- 230000008569 process Effects 0.000 description 10
- 238000013461 design Methods 0.000 description 7
- 238000000746 purification Methods 0.000 description 7
- 238000002485 combustion reaction Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 4
- 238000004880 explosion Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000004064 recycling Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910001341 Crude steel Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 238000011143 downstream manufacturing Methods 0.000 description 1
- 239000012717 electrostatic precipitator Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000005243 fluidization Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000003584 silencer Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000013022 venting Methods 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C2100/00—Exhaust gas
- C21C2100/02—Treatment of the exhaust gas
-
- 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 provides a converter primary flue gas full-dry dedusting and energy full-recovery system, which comprises a smoke hood, an evaporation cooling flue, a combustion-compensating device, a heat balancer, an explosion-proof special medium-temperature medium-pressure waste heat boiler and a dedusting device, wherein a flue gas outlet of a converter is butted with the smoke hood; the application provides a leading afterburner of system, through the control burning, the CO of low-content in to the system is getting into the burning and is getting rid of, and carries out deoxidation treatment at the oxygen in the non-smelting time waste gas of converter, simultaneously, carries out gaseous phase coalescence in the heat balance ware and handles, makes the coagulation of tiny particle dust grow greatly, is showing the clearance effect that has improved high temperature smoke and dust.
Description
Technical Field
The invention belongs to the technical field of dust removal, and particularly relates to a converter primary flue gas full-dry dust removal and energy full-recovery system.
Background
An oxygen blowing converter is a main smelting process device in steel production. China has more than 850 big and small converters, and the annual output accounts for 70-80% of the crude steel output in China. In the converter blowing process, high-temperature flue gas containing a large amount of dust and combustible gas is generated, wherein the content of CO can reach more than 80%, the high-temperature flue gas is converter gas with high recovery value after being dedusted and purified, and the heat value can reach 8000kJ/Nm3The above.
Converter gas has the characteristics of high temperature, high dust concentration, high CO concentration, short smelting period, large component fluctuation, combustibility, explosiveness and toxicity, and two purification and recovery technologies named OG and LT are formed up to now.
The OG method converter gas purification and recovery technology is a wet treatment process characterized by a two-stage venturi which is jointly developed by the Japanese New Japanese iron and Kawasaki heavy industry in the early sixties of the last century. The introduction of the technology into the 300t converter of the Bao steel first-stage project in the eighties, and then, the comprehensive popularization and application in China are achieved. The OG method has the main characteristics of mature technology, smooth flow, stable system, simple and convenient operation, safe operation and high gas recovery rate of 80-90Nm3T-s, waste heat recovery (steam) kg/t-s. The disadvantage is the limited purification efficiency (80 mg/Nm)3) And a set of complex sludge and sewage treatment facilities is required, so that the occupied area is large, and the operation energy consumption is high.
The LT method converter gas purification and recovery technology is a dry treatment process which is jointly developed by German Luqi and Theseng company and is characterized by cylindrical electric precipitation at the end of the last sixties. The 250t converter of the Bao Steel three-stage project of the nineties introduces the technology, and carries out secondary research and development and popularization in China, and more than 40 sets of LT devices are put into operation so far. The LT method uses an evaporative cooler to strengthen spray humidification and reduce the specific resistance of dust; by circlesThe cylindrical electric dust remover replaces a secondary venturi tube of an OG method to realize dry dust removal; the matched dust briquetting device is used for replacing huge sludge and sewage treatment facilities, and the collected dust is directly recycled. The method is mainly characterized in that: advanced technology, reasonable flow, energy conservation, environmental protection and good comprehensive effect. Saving 40-50% of land, 50-60% of electricity and 50-70% of water, and purifying dust concentration is less than or equal to 20mg/Nm3。
LT as a core technology of 'three-trunk' and 'three-utilization' becomes an energy-saving and environment-friendly hotspot in the steel industry in China, and the research and promotion meeting of LT is frequently called on, but the promotion effect is not ideal. The LT system which is already put into operation always has the problems, some actual operation indexes have certain differences from design values, the scheme comparison demonstration of new engineering is influenced, and some users can select more reliable OG improved technology. The LT technology covers the steelmaking process, is safe and stable in production, energy-saving and environment-friendly, and has the advantages of multiple related fields and great technical difficulty. Chinese science and technology personnel insist on digestion introduction and technical attack for more than ten years to obtain favorable results, but do not enter the 'keen and handy' state. The main problems of exposure in engineering:
the dust removal device has the advantages of low dust removal precision, large fluctuation and design of clean coal gas dust concentration of 20mg/Nm3However, many users can actually achieve less than or equal to 50mg/Nm3The normal operation of downstream process facilities and the recycling of clean gas are influenced;
the electrostatic precipitator has the explosion problem, the explosion venting valve frequently acts, and is an unsafe factor, the deformation of the polar plate and the polar line is easily caused, and the dust removal efficiency is reduced;
the cathode wire is corroded and broken, so that short circuit is caused sometimes, and the dust removal efficiency and safe operation are influenced;
since the fault factors are multiple and the maintenance workload is large, LT operation and safety and stability become a pair of contradictions and are mutually restricted;
the LT electric dust removal has poor PM2.5 purification effect, and the problem of dust control in the schedule of recent years is difficult to solve.
Disclosure of Invention
In order to solve the technical problems, the invention provides a converter primary flue gas full-dry dedusting and energy full-recovery system which comprises a smoke hood, an evaporation cooling flue, an afterburner, a thermal balancer, a boiler and a dedusting device, wherein a flue gas outlet of the converter is butted with the smoke hood, the evaporation cooling flue is communicated with the afterburner, the afterburner is communicated with the thermal balancer, an outlet of the thermal balancer is connected with an inlet of the boiler, and an outlet of the boiler is communicated with the dedusting device.
The converter primary smoke directly enters a heat pipe waste heat pipe boiler, a large amount of high-temperature smoke dust (molten state) is adhered on a heat pipe and cannot be removed, the system preposed afterburner provided by the application is used for removing low-content CO in a combustion mode by controlling combustion, oxygen in waste gas in non-smelting time of the converter is deoxidized, meanwhile, gas phase coagulation and treatment are carried out in a heat balancer, tiny particle dust is coagulated and grown, the removing effect of the high-temperature smoke dust is obviously improved, dead zones inevitably exist in a hopper and a gas conveying design of the pipe heat waste heat boiler, the situation that the front gas flow is pushed to move forwards by rear gas flow is difficult to realize, the situation that the oxygen and gas are mixed exists, the probability of explosion is increased, the system preposed afterburner is used for deoxidizing the oxygen in the system, the oxygen content in the waste gas is less than or equal to 2 percent, the requirement of the oxygen content, meanwhile, the design in the front system adopts a mode that the rear airflow pushes the front airflow to move forwards, and no dead angle exists in the whole process.
The invention has the following beneficial effects: according to the system pre-afterburner, low-content CO in the system is combusted and removed by controlling combustion, oxygen in waste gas is deoxidized in a converter non-smelting time, and meanwhile gas phase coagulation treatment is performed in a heat balancer, so that tiny particle dust is coagulated and grown, and the clearing effect on high-temperature smoke is obviously improved; the system provided by the invention fully utilizes the energy generated by smelting of the converter, and realizes the full recycling of the energy; the whole system does not need water for cooling, realizes the all-dry process, and has good effect of removing high-temperature smoke dust.
Drawings
FIG. 1 is a diagram illustrating the results of a converter primary flue gas full-dry dedusting and energy full-recovery process;
FIG. 2 is a schematic diagram illustrating a process flow of a system for full dry dedusting of primary flue gas and full recovery of energy in a transfer furnace.
Detailed Description
The present invention will be described in further detail with reference to the following examples and drawings.
Examples
As shown in fig. 1 and fig. 2, a block diagram showing the result and a schematic diagram of the process flow of the converter primary flue gas full dry dedusting and energy full recovery process of the present invention are shown, the converter primary flue gas full dry dedusting and energy full recovery system comprises a smoke hood 1, an evaporation cooling flue 2, a combustion-compensating device 3, a heat balancer 4, a boiler 5 and a dedusting device, the smoke hood 1 is butted with the flue gas outlet of the converter, the evaporation cooling flue 2 is communicated with the combustion-compensating device 3, the combustion-compensating device 3 is communicated with the heat balancer 4, the outlet of the heat balancer 4 is connected with the inlet of the boiler 5, the outlet of the boiler 5 is communicated with the dedusting device, the evaporation cooling flue 2 is provided with an oxygen content analyzer 7 and a coal gas content analyzer 8, the dedusting device comprises an explosion-proof wear-resistant variable frequency fan 9 connected with the boiler 5 and a switching station 10 connected with the explosion-proof wear-resistant variable frequency fan 9, the switching station 10 is respectively connected, the waste gas high-temperature bag-type dust collector 12 is respectively connected with a first fine ash conveying system 13 and a diffusing chimney 14, the coal gas high-temperature bag-type dust collector 11 is respectively connected with a second fine ash conveying system 15 and a coal gas cooler 16, the first fine ash conveying system 13 and the second fine ash conveying system 15 are both connected with a main ash storage bin 17, the coal gas cooler 16 is also connected with a converter gas cabinet 18, a silencer 19 is arranged between the explosion-proof wear-resistant frequency conversion fan 9 and the switching station 10, ash conveying equipment is arranged at the bottom of the afterburner 3 and/or the boiler 5, a special high-temperature dust collector 20 is arranged between the heat balancer 4 and the boiler 5, a first emergency ash discharge port 21 is arranged at the bottom of the afterburner 3, a second emergency ash discharge port 22 is arranged at the bottom of the special high-temperature dust collector 20, a first ash storage bin 23 is respectively communicated with the bottoms of the first emergency ash discharge port 21 and the second emergency ash discharge port 22, and a first ash storage bin 25 is further connected with the bottoms of the afterburner 3, the bottom of the special high-temperature dust remover 20 is also connected with a first ash storage bin 25 through a second ash conveying device 26, the bottom of the first ash storage bin 25 is connected with a general emergency ash discharge port 27, the bottom of the boiler 5 is connected with a second ash storage bin 29 through a third ash conveying device 28, and the bottom of the second ash storage bin 29 is connected with a third emergency ash discharge port 30.
Wherein, the novel vaporization cooling flue cools the flue gas temperature from 1650 ℃ to 1500 ℃ to 850 ℃ and 750 ℃, recovers high-pressure steam (175 kg/t-s) with 2.0 to 4.0MPa, and utilizes the waste heat to the maximum extent.
The afterburner combusts and deoxidizes the smoke with high oxygen content, heats the low-temperature smoke, combusts the smoke with low coal gas content, and fully utilizes the energy in the smoke. And simultaneously, the utilization rate of the waste heat boiler is improved.
The heat balancer balances the temperature of the flue gas, prevents the influence of overlarge temperature fluctuation on the system, condenses and grows the tiny particle dust in a gas phase, and is convenient for a high-temperature dust remover to collect and remove.
The special high-temperature dust remover preliminarily removes dust in the high-temperature flue gas to reduce the dust to 200mg/Nm3The use temperature of the special high-temperature dust collector reaches more than 950 ℃.
The boiler adopts an explosion-proof special medium-temperature and medium-pressure waste heat boiler, the temperature of coal gas is reduced to 150 ℃ from 850 ℃, the cooled coal gas enters a coal gas cooling system, the waste heat boiler has the functions of heat exchange and fire extinguishing, high-temperature flue gas contacts a boiler heat exchange tube bundle, and the temperature of the flue gas is gradually reduced while steam is generated.
The ID fan is a main power device of the system, and a wear-resistant fan is adopted, and the frequency conversion speed regulation is carried out so as to adapt to the smoke volume change and the furnace mouth pressure control requirement in a smelting period.
The switching station consists of two sets of bell-shaped valves and glasses valves, and is hydraulically driven and rapidly switched; so as to meet the switching requirement of recovery and diffusion in one smelting period.
Two sets of bag type dust collectors are final purification equipment of the system, and can ensure that the dust concentration of the clean gas is less than or equal to 5mg/Nm3(ii) a The dust concentration of the diffused waste gas is less than or equal to 5mg/Nm3。
The ash conveying equipment adopts a mechanical and pneumatic ash conveying combined type, and the dry dust briquettes are directly recycled or are intensively conveyed to sinter and uniformly mix for recycling; the pneumatic ash conveying is also called as air flow conveying, and granular materials are conveyed in an air flow direction in a closed pipeline by utilizing the energy of air flow, so that the pneumatic ash conveying is a specific application of a fluidization technology; the principle of mechanical ash conveying is that the rotation of parts in the equipment pushes the materials to form continuous integral flow, only one conveying flow is needed, no auxiliary facilities are needed, the system is simple, the equipment is few, the intermediate links are few, the occupied area is small, the investment cost is low, and the indirect operation maintenance cost is low. Therefore, the system simplicity is an important way to reduce ash transportation investment.
The prior converter primary smoke directly enters a heat pipe waste heat pipe boiler, a large amount of high-temperature smoke dust (molten state) is adhered on a heat pipe and cannot be removed, the system preposed afterburner provided by the application is used for removing low-content CO in the system by controlling combustion, and deoxidizing treatment is carried out on oxygen in waste gas in the non-smelting time of the converter, meanwhile, gas phase coagulation and treatment are carried out in a heat balancer, so that tiny particle dust is coagulated and grown, the removing effect on the high-temperature smoke dust is obviously improved, dead zones are inevitably existed in the design of a pipe heat waste heat boiler hopper and gas delivery, the situation that the front gas flow is pushed to move forwards by the rear gas flow is difficult to realize, the situation that oxygen and coal gas are mixed exists, the explosion probability is increased, the system preposed afterburner has the oxygen in the system subjected to deoxidization treatment, the oxygen content in the waste gas is less than or equal, the system is safe and reliable, meanwhile, the design in the front system adopts a mode that the rear airflow pushes the front airflow to move forwards, and no dead angle exists in the whole process.
The processing system of the company places the fan and the switching station in front of the high-temperature bag type dust collector, and simultaneously adopts two sets of high-temperature bag type dust collectors, one set of high-temperature bag type dust collectors is used for processing coal gas, the other set of high-temperature bag type dust collectors is used for processing waste gas, so that the situation that the coal gas and the waste gas are simultaneously processed by one set of high-temperature bag type dust collectors is avoided, the coal gas and the waste gas are prevented from being mixed.
The system provided by the invention develops various special recovery processing devices special for the full dry recovery of the primary flue gas of the converter on the basis of fully considering the properties of the primary flue gas of the converter, and solves the problem of safe recovery and utilization of the heat energy and the chemical energy of the primary flue gas of the converter.
Features of the system
The system has the following characteristics:
A. the energy generated by smelting of the converter is fully utilized, full recycling of the energy is realized, the whole system does not need water for cooling, and a full dry process is realized;
B. the combustion is controlled by the afterburner, so that the oxygen content and the coal gas content in the system waste gas are reduced, the system is safe and reliable, the oxygen content and the coal gas content in the system waste gas are low, and the safety is good;
C. the dust removal and purification efficiency is high, and the concentration of coal gas and dust is reduced to 5mg/Nm by the bag-type dust remover3The quality of the coal gas is greatly improved. The discharge concentration reaches 5mg/Nm3The following, and is very stable.
D. A special high-temperature dust remover is adopted for coarse dust removal, so that the abrasion of a boiler and a fan is prevented;
E. the removal rate of PM2.5 by the high-temperature coal gas bag type dust collector and the high-temperature exhaust gas bag type dust collector can reach 99.95 percent, so that the emission of PM2.5 dust is effectively reduced, and the emission of PM2.5 dust is effectively reduced;
F. the system adopts a full-dry method for treatment, does not have secondary pollution and sewage treatment, and has obvious water-saving effect;
G. the system has small resistance loss, can save energy and power consumption, has high calorific value of coal gas, can directly utilize recovered dust, is a full-dry system, does not need water (the OG method or the LT method needs to spray a large amount of water or steam into flue gas, increases the flow rate of the flue gas, increases the system resistance, and simultaneously reduces the calorific value of the coal gas because the coal gas contains a large amount of water (saturated water)), thereby reducing the system resistance and simultaneously improving the calorific value of the coal gas;
H. the heat energy of the flue gas is fully utilized by adopting a novel efficient vaporization cooling flue;
J. the system is simplified, the occupied area is small, and the management and the maintenance are convenient;
K. compared with OG method and LT method, the system is simple and the technological process is simplified. The system has few components, is simple and convenient to control, effectively reduces the fault rate of the system, improves the reliability of the system, and has low fault rate and high reliability;
and L, through a DCS control system, the automatic linkage of the converter operation and the system is realized, the converter operation is not influenced, and the operation requirement is reduced. The content of the recovered coal gas (CO) is adjusted through a three-way switching valve (10), so that the heat value of the coal gas is adjusted; the operation requirement on the converter is low, and the content of the reclaimed gas can be adjusted, so that the heat value of the gas can be adjusted;
m, no water is contained in the recovered coal gas, and the heat value is high.
Analysis of economic and social benefits
The following benefit analysis was conducted using 150 converters as an example
1) Basic parameters
2) Exhaust-heat boiler system
The main design parameters of the waste heat boiler are as follows:
3) investment approximate calculation:
equipment investment: 2350 Ten thousand yuan
Construction and installation: 1200 ten thousand yuan
Designing: 200 ten thousand yuan
The total engineering cost is as follows: 3750 ten thousand yuan
4) The economic value of technical transformation is reflected:
(1) the heat of the coal gas at 850-150 ℃ is recovered;
(2) the water consumption of an evaporative cooler of the OG system or the LT system is eliminated;
(3) the gas does not contain water, the heat value is improved, and the gas is favorably utilized;
(4) the resistance of the dust removal system is reduced, and the power consumption of the primary fan during operation is reduced;
(5) other economic benefits;
(6) environmental protection benefit.
A. The heat of the coal gas at 850-150 ℃ is recovered, as shown in Table 1;
TABLE 1 environmental protection income table
| Serial number | Item | Unit of | Number of | Annual recovery | Remarks for note |
| 1 | Saturated steam | t/h | 30.2 | 24 ten thousand tons | |
| 2 | Electric energy production | kwh | 4314 | 3451 ten thousand KWH | 7kg steam/kwh |
| 3 | Revenue of electricity generation | Yuan | 1898 ten thousand yuan | 0.55 yuan/kwh |
Description of the drawings: by adopting the flue gas afterburning system, the stable operation of the waste heat 0 is kept during the period that the converter does not blow oxygen, and the chemical latent heat of the diffused part of the coal gas is recovered, so that the economic benefit is more obvious. The generating capacity reaches 6000KWh, the annual generating capacity can reach 4800 ten thousand kilowatt hours, and the economic benefit of 2640 ten thousand yuan is generated.
B. Water consumption of the evaporative cooler of the OG system or the LT system is eliminated, and the result is shown in a table 2;
TABLE 2 Water consumption Meter
284.55 ten thousand yuan or 179.175 ten thousand yuan can be saved each year.
C. The coal gas contains no water, the heat value is improved, and the coal gas is favorably utilized. The gas by the OG method or the LT method contains a large amount of water (saturated water by the OG method and unsaturated water by the LT method), the heat value of the gas is reduced, and a large amount of heat is consumed during utilization.
D. The resistance of the dust removal system is reduced, and the power consumption of the primary fan is reduced, and the result is shown in table 3.
Table 3. electricity consumption table generated by each method.
E. Other economic benefits
The running cost of the electric dust collector after the gas tank is cancelled is about 20 ten thousand yuan per year. The gas system has no water, reduces the corrosion of the equipment pipeline and prolongs the service life.
F. Environmental protection benefit
The concentration of coal gas dust is reduced to 5mg/Nm by the bag-type dust remover3The quality of the coal gas is greatly improved. The discharge concentration reaches 5mg/Nm3The following. Reduce pollutant emission and realize ultralow emission.
The preliminary analysis shows that the initial investment (about 3750 ten thousand yuan) of the converter primary flue gas energy full recovery system is equivalent to the initial investment (about 4000 ten thousand yuan) of the LT dry dedusting system. But because converter primary flue gas energy full recovery system has many advantages, heat energy is all retrieved, does not use water, and area is little, and the running cost is low, and the investment recovery is fast, can retrieve the investment less than a year (7-8 months). Has good development prospect.
The connection relationship between the devices in the drawings of the present invention is for clearly explaining the need of information interaction and control process, and therefore should be regarded as a logical connection relationship, and should not be limited to physical connection only; the present invention is not limited to the above-mentioned preferred embodiments, and any other products in various forms can be obtained by anyone in the light of the present invention, but any changes in the shape or structure thereof, which have the same or similar technical solutions as those of the present application, fall within the protection scope of the present invention.
Claims (8)
1. Converter flue gas dry process all removes dust and energy recovery system entirely, its characterized in that, converter flue gas dry process all removes dust and energy recovery system entirely includes petticoat pipe (1), vaporization cooling flue (2), afterburner (3), heat balance (4), boiler (5) and dust collector, petticoat pipe (1) docks with the exhanst gas outlet of converter, vaporization cooling flue (2) with afterburner (3) intercommunication, afterburner (3) with heat balance (4) intercommunication, the export of heat balance (4) with the entry linkage of boiler (5), the export of boiler (5) with dust collector intercommunication.
2. The converter primary flue gas full dry dedusting and energy full recovery system according to claim 1, characterized in that an oxygen content analyzer (7) and a coal gas content analyzer (8) are arranged on the vaporization cooling flue (2).
3. The system for the full dry dedusting and energy recovery of the primary flue gas of the converter according to claim 1, it is characterized in that the dust removing device comprises an explosion-proof wear-resistant variable frequency fan (9) connected with the boiler (5) and a switching station (10) connected with the explosion-proof wear-resistant variable frequency fan (9), the switching station (10) is respectively connected with a coal gas high-temperature bag-type dust remover (11) and a waste gas high-temperature bag-type dust remover (12), the waste gas high-temperature bag-type dust collector (12) is respectively connected with a first fine ash conveying system (13) and a diffusing chimney (14), the coal gas high-temperature bag-type dust collector (11) is respectively connected with a second fine ash conveying system (15) and a coal gas cooler (16), the first fine ash conveying system (13) and the second fine ash conveying system (15) are both connected with the main ash storage bin (17), and the gas cooler (16) is also connected with a converter gas cabinet (18).
4. The converter primary flue gas full dry dedusting and energy full recovery system according to claim 1, characterized in that a muffler (19) is arranged between the explosion-proof wear-resistant variable frequency fan (9) and the switching station (10).
5. The system for the total dry dedusting and the total energy recovery of the primary flue gas of the converter according to the claim 1, characterized in that a special high temperature deduster (20) is arranged between the heat balancer (4) and the boiler (5).
6. The system for the total dry dedusting and the total energy recovery of the primary flue gas of the converter according to claim 1, wherein an ash conveying device is arranged on the afterburner (3) and/or the boiler (5).
7. The converter primary flue gas full dry dedusting and energy full recovery system according to claim 6, wherein a first emergency ash discharge port (21) is arranged at the bottom of the afterburner (3), a second emergency ash discharge port (22) is arranged at the bottom of the special high temperature deduster (20), the bottoms of the first emergency ash discharge port (21) and the second emergency ash discharge port (22) are both communicated with a first ash bin (23), the bottoms of the afterburner (3) and the thermal balancer (4) are also connected with a first ash storage bin (25) through a first ash conveying device (24), the bottom of the special high temperature deduster (20) is also connected with the first ash storage bin (25) through a second ash conveying device (26), and the bottom of the first ash storage bin (25) is connected with a main emergency ash discharge port (27).
8. The converter primary flue gas full dry dedusting and energy full recovery system according to claim 1, characterized in that the bottom of the boiler (5) is connected with a second ash storage bin (29) through a third ash conveying device (28), and the bottom of the second ash storage bin (29) is connected with a third emergency ash discharge port (30).
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| CN202110212669.7A CN113025776A (en) | 2021-02-25 | 2021-02-25 | Converter primary flue gas full-dry dedusting and energy full-recovery system |
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| CN202110212669.7A CN113025776A (en) | 2021-02-25 | 2021-02-25 | Converter primary flue gas full-dry dedusting and energy full-recovery system |
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