CN114350887A - Coal gas ultra-low purification treatment system suitable for upgrading converter coal gas LT dry method system - Google Patents
Coal gas ultra-low purification treatment system suitable for upgrading converter coal gas LT dry method system Download PDFInfo
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- 238000000746 purification Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 34
- 239000003034 coal gas Substances 0.000 title claims abstract description 23
- 239000003546 flue gas Substances 0.000 claims abstract description 90
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 89
- 239000007789 gas Substances 0.000 claims abstract description 88
- 238000001816 cooling Methods 0.000 claims abstract description 86
- 239000000428 dust Substances 0.000 claims abstract description 78
- 238000005406 washing Methods 0.000 claims abstract description 25
- 238000005507 spraying Methods 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 80
- 230000005684 electric field Effects 0.000 claims description 24
- 239000007921 spray Substances 0.000 claims description 21
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 16
- 239000000725 suspension Substances 0.000 claims description 15
- 238000011010 flushing procedure Methods 0.000 claims description 10
- 238000001704 evaporation Methods 0.000 claims description 9
- 230000008020 evaporation Effects 0.000 claims description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 7
- 229910052573 porcelain Inorganic materials 0.000 claims description 6
- 238000004880 explosion Methods 0.000 claims description 4
- 238000013022 venting Methods 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 239000010410 layer Substances 0.000 claims description 3
- 239000011152 fibreglass Substances 0.000 claims description 2
- 239000002356 single layer Substances 0.000 claims description 2
- 229910001220 stainless steel Inorganic materials 0.000 claims description 2
- 239000010935 stainless steel Substances 0.000 claims description 2
- 239000012212 insulator Substances 0.000 claims 3
- 238000009413 insulation Methods 0.000 claims 2
- 238000011084 recovery Methods 0.000 abstract description 11
- 229910000831 Steel Inorganic materials 0.000 abstract description 2
- 239000010959 steel Substances 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 8
- 238000007664 blowing Methods 0.000 description 6
- 230000008016 vaporization Effects 0.000 description 6
- 238000009792 diffusion process Methods 0.000 description 5
- 238000009834 vaporization Methods 0.000 description 5
- 238000000889 atomisation Methods 0.000 description 4
- 239000012718 dry electrostatic precipitator Substances 0.000 description 4
- 238000001035 drying Methods 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 240000002853 Nelumbo nucifera Species 0.000 description 2
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 2
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- 238000010586 diagram Methods 0.000 description 2
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- 239000012717 electrostatic precipitator Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000005453 pelletization Methods 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
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- 235000018290 Musa x paradisiaca Nutrition 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
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- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
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- 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
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Abstract
The invention relates to the technical field of primary flue gas purification of a steel converter, in particular to a coal gas ultra-low purification treatment system suitable for upgrading a converter coal gas LT dry method system. The system is characterized in that the flow direction of the internal flue gas is downward-in and upward-out, the system can be functionally and integrally divided into two parts, the lower part is a cooling and washing section, a plurality of layers of spraying devices are arranged inside the system, the flue gas purified by a dry type electrostatic dust collector is directly cooled to meet the temperature requirement of converter gas recovery, the upper part is a wet type electrostatic dust collection section, wet type electrostatic dust collection equipment is adopted to carry out fine dust collection on the flue gas, the flue gas enters from an air inlet at the lower part of the equipment, and after being cooled by the gas cooling section, the flue gas is subjected to fine dust collection by the wet type electrostatic dust collection section.
Description
Technical Field
The invention relates to the technical field of primary flue gas purification of a steel converter, in particular to a coal gas ultra-low purification treatment system suitable for upgrading a converter coal gas LT dry method system.
Background
In the steelmaking converter process in the metallurgical industry, flue gas generated after oxygen blown into a converter reacts with carbon in molten iron is discharged from a converter mouth, and the flue gas contains a large amount of CO gas, so the flue gas is also called converter gas or converter primary flue gas. The method for purifying the converter gas is mainly divided into a wet method and a dry method, wherein the dry method dust removal has the remarkable characteristics of advanced technology, low comprehensive operation cost, obvious water and electricity saving, higher dust removal effect and the like. LT dry dedusting mainly refers to a flue gas purification and gas recovery system, wherein flue gas is cooled and cooled by an evaporative cooler and subjected to coarse dedusting, then the flue gas enters an electrostatic precipitator for fine dedusting, qualified gas after fine dedusting is sent to a gas cabinet through a switching station, and unqualified gas is ignited and diffused through a chimney. The 1500 ℃ high-temperature flue gas discharged from the converter mouth of the converter is cooled to 900 ℃ through a vaporization cooling flue under the negative pressure action of a gas fan, then enters an evaporation cooling tower, is cooled and tempered under the action of water spraying and atomization, is directly cooled to about 250 ℃, simultaneously enables the properties of the flue gas to meet the requirements of an electrostatic dust collector, and settles and separates out coarse particle dust in the flue gas. And (3) the converter gas after temperature reduction and tempering enters an electrostatic dust collector through a gas pipeline, the flue gas is further purified under the action of an electrostatic field, and fine ash is separated from the flue gas. After the purified converter gas passes through the fan, the low-quality gas is directly diffused through the diffusion chimney, and the high-quality gas is cooled and washed by the gas washing and cooling tower and then enters the gas cabinet for storage.
The dry process flow is a converter gas dust removal process which is generally adopted in China at present, the process needs to control the water injection amount and the atomization effect in the evaporative cooling tower according to the actual conditions of each production stage, so that the cooling and dust conditioning effects of the converter gas are optimal, the requirements of an electrostatic dust collector are met, and the air volume of a dust removal system is accurately adjusted by an automatic means so as to be matched with the production process. However, in view of the actual operation effect of many domestic converter gas dry dedusting systems, it is difficult to stably control parameters such as water injection amount, atomization effect and air volume for a long time, and further the emission is not up to the standard.
Disclosure of Invention
The invention aims to solve the problem that a converter gas LT dry dedusting system cannot effectively remove dustThe concentration of the dust in the purified flue gas is lower than 10mg/Nm3The system can be arranged at the rear part of a gas fan of the LT dry-method dust removal system and the front part of a switching station.
The ultra-low gas purification treatment system suitable for upgrading the converter gas LT dry method system comprises a shell, a cooling washing section positioned at the lower part and a wet method electrostatic dust removal section positioned at the upper part, wherein,
the cooling washing section is provided with an evaporative cooling system and a spraying cooling system, wherein the evaporative cooling system is annularly and equidistantly arranged by adopting a plurality of double-flow spray guns, new water with set flow and pressure and compressed nitrogen are simultaneously sprayed out from a nozzle and are fully atomized, and after fog drops are mixed with high-temperature flue gas, the flue gas is rapidly cooled by completely evaporating moisture and absorbing heat;
the spraying cooling system adopts a multilayer single-flow spray gun to spray turbid circulating water with set flow and pressure from a nozzle, liquid drops are mixed with high-temperature flue gas and then the flue gas is rapidly cooled through direct contact,
and in the wet electrostatic dust removal section, wet electrostatic dust removal equipment is adopted to perform fine dust removal on the flue gas, the flue gas enters from an air inlet at the lower part of the equipment, and is cooled by the coal gas cooling section and then is subjected to fine dust removal by the wet electrostatic dust removal section.
The ultra-low gas purification treatment system suitable for upgrading the converter gas LT dry method system is characterized in that the wet method electrostatic dust removal section comprises a honeycomb anode plate, a cathode wire, a suspension system and an electric field flushing system, and the flue gas purified by the dry method electrostatic dust remover is further subjected to deep purification treatment so as to meet the requirement that the dust concentration is lower than 10mg/Nm3Ultra-low emission requirements.
The coal gas ultra-low purification treatment system suitable for upgrading the dry method system of the converter coal gas LT is characterized in that a dehydrator is arranged between the cooling washing section and the wet method electrostatic dust removal section.
According to the ultra-low coal gas purification treatment system suitable for upgrading the converter coal gas LT dry method system, water for a spraying and cooling system of the cooling and washing section and water for an electric field washing system of the wet method electrostatic dust removal section are turbid circulating water, instantaneous water supply amount and water pressure are basically the same, and the water supply amounts and the water pressure can be switched mutually for use and share a set of turbid circulating water supply system.
The advantages and benefits of the invention are:
the ultra-low gas purification treatment system suitable for upgrading the converter gas LT dry method system has the following advantages:
(1) the evaporative cooling adopts a plurality of double-flow spray guns which are annularly arranged at equal intervals, new water with set flow and pressure and compressed nitrogen are sprayed out from the nozzles and are fully atomized, and after fog drops are mixed with high-temperature flue gas, the flue gas is rapidly cooled through complete evaporation and heat absorption of water. The cooling facility is mainly used for evaporative cooling in the early stage and the later stage of flue gas emission of converter blowing, the temperature of the flue gas is adjusted to 80-120 ℃ from 170 ℃ of the outlet of a gas fan, the flue gas is tempered while the temperature of the flue gas is reduced, the dust specific resistance is improved, the trapping efficiency of an electric field is improved, and meanwhile, an evaporative cooling system can also participate in the flue gas cooling in the gas recovery stage. The spraying cooling system is suspended in the flue gas diffusion stage, so that the water consumption of the system and the power consumption of a turbid circulating water supply pump station can be effectively saved, and the load of a turbid circulating water treatment facility is reduced.
(2) The spraying cooling adopts a multi-layer single-flow spray gun arrangement, turbid circulating water with set flow and pressure is sprayed out from a nozzle, and after liquid drops are mixed with high-temperature flue gas, the flue gas is rapidly cooled through direct contact. The cooling facility is mainly used for heat exchange and cooling in the middle stage of gas recovery in converter blowing, the temperature of flue gas is within 70 ℃ from 170 ℃ of the outlet of a gas fan, so that the requirement of the inlet temperature of a gas chamber is met, the flue gas is tempered while being cooled, the specific resistance of dust is improved, and the trapping efficiency of an electric field is improved.
(3) A dehydrator is arranged between the cooling washing section and the wet electrostatic dust removal section, and the dehydrator catches liquid drops by using a mechanical baffle, so that the content of liquid water carried in flue gas is reduced, and the influence of excessive liquid water on an electric field is reduced.
(4) The wet electrostatic dust-removing section is composed of honeycomb anode plate, cathode wire, suspension system and electric field flushing system, and can be used for further deeply purifying the flue gas purified by dry electrostatic dust-remover to make its dust concentration be less than 10mg/Nm3Ultra-low emission requirements. The negative pole of electric field is constituteed to the negative pole line for release electron makes the dust lotus electric charge and moves to the anode plate, and the honeycomb anode plate is used for the entrapment lotus electric dust, and electric field rinse-system is used for washing the deashing of anode plate, guarantees the electric field steady operation.
(5) The water for the spraying and cooling system of the cooling and washing section and the water for the electric field washing system of the wet electrostatic dust removal section are turbid circulating water, the instantaneous water supply amount and the water pressure are basically the same, and the water supply amount and the water pressure can be switched for use, so that a set of turbid circulating water supply system is shared.
Drawings
FIG. 1 is a schematic structural diagram of a gas ultra-low purification treatment system suitable for upgrading a converter gas LT dry system according to the invention;
FIG. 2 is a schematic diagram of a gas ultra-low purification treatment system suitable for upgrading a converter gas LT dry method system in the LT dry method dust removal system.
Reference numerals:
1: an outer housing; 2: an evaporative cooling system; 3: a spray cooling system; 4: a dehydrator; 5: a honeycomb anode plate; 6: a cathode line and a suspension system; 7: an electric field flushing system; 8: an explosion venting valve; 9: an insulating box 10: a high-frequency power supply 10; 11: a water outlet;
2-1: a vaporizing cooling flue; 2-2: an evaporative cooling tower; 2-3: a coarse ash chain conveyor; 2-4: a raw gas pipeline; 2-5: a dry electrostatic precipitator; 2-6: a clean gas pipeline; 2-7: a gas fan; 2-8: a gas ultra-low purification treatment system; 2-9: switching stations; 2-10: a diffusing chimney; 2-11: a gas cooler; 2-13: a coarse ash bin; 2-14: and refining the bin.
Detailed Description
The technical solutions of the present application are described in detail below with reference to the accompanying drawings and specific embodiments.
According to the ultra-low gas purification treatment system suitable for upgrading the converter gas LT dry method system, the flow direction of flue gas in the system is downward inlet and upward outlet, the system can be integrally divided into two parts from the function aspect, the lower part is a cooling washing section, a multilayer spraying device is arranged in the system, the flue gas purified by a dry type electrostatic dust collector is directly cooled to meet the temperature requirement of converter gas recovery, the upper part is a wet type electrostatic dust collection section, wet type electrostatic dust collection equipment is adopted to carry out fine dust collection on the flue gas, the flue gas enters from an air inlet at the lower part of the equipment, and after being cooled by the gas cooling section, the flue gas is subjected to fine dust collection by the wet type electrostatic dust collection section.
Wherein, this equipment lower part is the swash plate, and the purpose is to assemble one side with the inside shower water of equipment, recycles self gravity and discharges from the outlet, and the cooling section is provided with evaporation cooling system and sprays cooling system.
The evaporative cooling adopts a plurality of double-flow spray guns which are annularly arranged at equal intervals, new water with set flow and pressure and compressed nitrogen are sprayed out from the nozzles at the same time and are sufficiently atomized, and after fog drops are mixed with high-temperature flue gas, the flue gas is rapidly cooled through complete evaporation and heat absorption of water. The cooling facility is mainly used for evaporative cooling in the early stage and the later stage of flue gas emission of converter blowing, the temperature of the flue gas is adjusted to 80-120 ℃ from 170 ℃ of the outlet of a gas fan, the flue gas is tempered while the temperature of the flue gas is reduced, the dust specific resistance is improved, the trapping efficiency of an electric field is improved, and meanwhile, an evaporative cooling system can also participate in the flue gas cooling in the gas recovery stage. The spraying cooling system is suspended in the flue gas diffusion stage, so that the water consumption of the system and the power consumption of a turbid circulating water supply pump station can be effectively saved, and the load of a turbid circulating water treatment facility is reduced.
The spraying cooling system is arranged by adopting a multilayer single-flow spray gun, turbid circulating water with set flow and pressure is sprayed out from a nozzle, and liquid drops are mixed with high-temperature flue gas and then rapidly cooled by direct contact. The cooling facility is mainly used for heat exchange and cooling in the middle stage of gas recovery in converter blowing, the temperature of flue gas is within 70 ℃ from 170 ℃ of the outlet of a gas fan, so that the requirement of the inlet temperature of a gas chamber is met, the flue gas is tempered while being cooled, the specific resistance of dust is improved, and the trapping efficiency of an electric field is improved.
The wet electrostatic dust collection section is arranged on the lower portion of the flue gas, the lower portion of the flue gas is provided with a cooling washing section, the lower portion of the flue gas is provided with a wet electrostatic dust collection section, and the cooling washing section is communicated with the wet electrostatic dust collection section.
Wherein, the wet electrostatic dust removal section consists of a honeycomb anode plate, a cathode wire, a suspension system and an electric field flushing system, and the flue gas purified by the dry electrostatic dust remover is further subjected to deep purification treatment so as to meet the requirement that the dust concentration is lower than 10mg/Nm3Ultra-low emission requirements. The cathode wire forms the cathode of the electric field and is used for releasing electrons to charge the dust and transfer the dust to the anode plate; the honeycomb anode plate is used for trapping charged dust; the electric field flushing system is used for cleaning and flushing the anode plate, and stable operation of an electric field is guaranteed.
The water for the spraying and cooling system of the cooling washing section and the water for the electric field washing system of the wet electrostatic dust removal section are turbid circulating water, the instantaneous water supply amount and the water pressure are basically the same, and the water supply amount and the water pressure can be switched for use, so that a set of turbid circulating water supply system is shared.
As shown in fig. 1, the ultra-low gas purification treatment system suitable for upgrading converter gas LT dry process system mainly comprises: the device comprises an external shell 1, an evaporative cooling system 2, a spraying cooling system 3, a dehydrator 4, a honeycomb anode plate 5, a cathode wire and suspension system 6, an electric field flushing system 7, an explosion venting valve 8, an insulating box 9, a high-frequency power supply 10 and a water outlet 11.
The evaporative cooling system 2 adopts a plurality of double-flow spray guns which are annularly arranged at equal intervals, new water with set flow and pressure and compressed nitrogen are simultaneously sprayed from the nozzles and are fully atomized, and new water and compressed nitrogen interfaces of the spray guns are respectively connected with a new water annular main pipe and a compressed nitrogen annular main pipe through metal hoses; the spraying cooling system 3 is arranged by adopting a multilayer single-flow spray gun, turbid circulating water with set flow and pressure is sprayed out from a nozzle, and a water supply interface of the spray gun is connected with a turbid circulating water annular main pipe through a metal hose.
The dehydrator 4 is in the form of a sloping plate or a folded plate and is fixed on the inner side of the shell.
The honeycomb anode plate 5 is composed of a plurality of tube bundle structures with hexagonal sections, is uniformly distributed and fixed on the inner side of the shell, is made of stainless steel or glass fiber reinforced plastics, and is used as an anode of an electrostatic field for receiving electrons and collecting dust; the cathode wire and suspension system 6 comprises a plurality of cathode discharge electrode wires penetrating through the honeycomb anode plate, the upper end and the lower end of each electrode wire are respectively connected and arranged on an electrode wire suspension frame, the electrode wire suspension frame positioned on the upper portion is suspended on a plurality of high-voltage insulating porcelain bottles through a plurality of electrode wire suspension rods, the insulating porcelain bottles are arranged inside an insulating box 9 on a top cover of the device, and the suspension rod of one suspension frame is connected with a high-frequency power supply 10 through a lead.
The electric field flushing system 7 adopts a single-layer water supply pipe network to be fixed on the inner side of the shell through a supporting structure, a plurality of nozzles are uniformly distributed on the pipe network, and the water supply pipe network is connected with an outer water supply pipeline.
The explosion venting valve 8 is vertically arranged on the upper part of the top cover of the equipment.
The inside of the insulating box 9 is forcibly swept by heating nitrogen, a certain positive pressure environment inside the insulating box is kept, an electric heater is arranged around the insulating porcelain bottle, and a heat preservation layer is arranged outside the insulating box.
The water outlet 11 is arranged at the bottom of the system, and dust-containing washing water is discharged from the water outlet through the self gravity.
As shown in figure 2, the main equipment of the common converter primary flue gas LT dry dedusting system comprises an evaporative cooling tower 2-2 connected with the tail end of a vaporization cooling flue 2-1, a banana bend and coarse ash chain conveyor 2-3, a raw gas pipeline 2-4, a dry electrostatic precipitator 2-5, a clean gas pipeline 2-6, an axial flow type or centrifugal type gas fan 2-7, a switching station 2-9, a diffusing chimney 2-10, a gas cooler 2-11, a coarse ash bin 2-13 and a refining bin 2-14. High-temperature flue gas generated in the converter steelmaking process firstly passes through the vaporization cooling flue 2-1, and primary cooling is carried out on the flue gas while heat energy is recovered. The flue gas cooled by the vaporization cooling flue 2-1 passes through the vaporization cooling tower 2-2 to be secondarily cooled, and simultaneously, the flue gas is roughly dedusted and tempered. And (3) feeding the cooled, roughly dedusted and tempered flue gas into a cylindrical dry electrostatic precipitator 2-5 for fine dedusting. The flue gas after fine dust removal is switched to a diffusing chimney 2-10 for diffusing by a switching station 2-9, or is sent to a gas tank 2-12 for storage after being cooled by a gas cooler 2-11.
In the existing converter LT dry dedusting system, the flue gas at the outlet of the operated dry electrostatic precipitator basically has no stable effect of ensuring that the dust concentration is less than or equal to 10mg/Nm3The engineering example has good operation effect and can only ensure that the dust concentration is between 10mg and 30mg/Nm3In the meantime.
The gas ultra-low purification treatment system 2-8 is additionally arranged on a clean gas pipeline 2-6 between a gas fan 2-7 and a switching station 2-9 of a converter primary flue gas LT dry dust removal system, and deep purification is carried out on flue gas which is purified by a dry electrostatic dust collector and cannot meet the ultra-low emission requirement. The turbid circulating water originally used for the gas cooler 2-11 can be used for the gas ultra-low purification treatment system, and the water quantity and the water pressure can be kept unchanged.
When the coal gas ultra-low purification treatment system works, the flue gas treated by the dry type electrostatic dust collector enters the ultra-low purification treatment system through the coal gas fan, and the inlet flue gas temperature of the equipment is about 170 ℃. The O in the flue gas is in the first and last minutes (usually 3-5 minutes) of the converter blowing cycle2And the CO content can not meet the requirement of coal gas recovery, the evaporative cooling system of the ultralow purification treatment system and the high-pressure system of the wet electrostatic dust removal section are started, the smoke temperature of the cooling section is controlled to be between 80 and 120 ℃, the cooled smoke enters the wet electrostatic dust removal section at the upper part for deep purification, and is discharged to the atmosphere from the emission chimney through the switching station.
According to the ultralow purification treatment system of this application, owing to adopted the evaporation cooling in flue gas diffusion stage, the water consumption compares and sprays the cooling greatly reduced. Take a converter with a nominal capacity of 220t as an example, the same is performed for 220000Nm3The spraying cooling of the flue gas per hour is not generally carried out with water quantity regulation in order to meet the requirement of coal gasThe recovery conditions, whether gas is diffused or recovered, are designed according to the design of cooling the flue gas to below 70 ℃, the water consumption of the turbid circulation is generally 200-250 t/h, if evaporative cooling is adopted for cooling, the temperatures of gas diffusion and gas recovery are controlled in a distinguishing mode, the water quantity required by the evaporative cooling is only 10t/h, and the treatment load and the power consumption of a corresponding turbid circulation water system are greatly reduced.
According to the ultralow purification treatment system, the design of a double-flow spray gun is adopted for evaporative cooling, the water supply and air supply pipelines are provided with flow regulation facilities, the water quantity and the air quantity can be flexibly regulated according to the outlet flue gas temperature of a coal gas fan and the inlet temperature of a wet electrostatic dust removal section, the atomization effect can be kept stable, and the flue gas cooling effect is further ensured.
In the middle stage of converter blowing, O in flue gas2And the CO content can meet the requirement of coal gas recovery, at the moment, a spray cooling system of the ultralow purification treatment system and a high-pressure system of a wet electrostatic dust removal section are kept on simultaneously, the temperature of the flue gas in the cooling section is directly reduced to be below 70 ℃, the flue gas enters the wet electrostatic dust removal section through a dehydrator for deep purification, and the flue gas is conveyed to a coal gas cabinet through a switching station for storage.
At the intermittent stage of converter converting cycle, the gas fan low-speed operation, what the dust pelletizing system inside circulated was clean air this moment, LT dry process dust pelletizing system stops unnecessary work, the cooling washing section of the ultralow purification treatment system of this application stops the water supply air feed, the high tension electricity disconnection of wet process electrostatic precipitator section to open electric field rinse system and wash polar line, the time about 5-10 minutes can, wash water and cooling washing section shower water switch over the use.
The above examples are only for understanding the technical solutions of the present application, and do not limit the scope of the present application.
Claims (10)
1. A coal gas ultra-low purification treatment system suitable for upgrading a converter coal gas LT dry method system is characterized by comprising a shell, a cooling washing section positioned at the lower part and a wet method electrostatic dust removal section positioned at the upper part, wherein,
flue gas enters from the lower part of the coal gas ultra-low purification treatment system suitable for upgrading the converter coal gas LT dry method system, is cooled by the cooling washing section, and then is subjected to fine dust removal by the wet method electrostatic dust removal section;
the cooling washing section is provided with an evaporation cooling system and a spraying cooling system, wherein,
the evaporation cooling system adopts a plurality of double-flow spray guns which are annularly arranged at equal intervals, new water with set flow and pressure and compressed nitrogen are sprayed out from the nozzles of the double-flow spray guns and are fully atomized, and after fog drops are mixed with high-temperature flue gas, the flue gas is rapidly cooled through complete evaporation and heat absorption of water,
the spraying cooling system adopts a multilayer single-flow spray gun, turbid circulating water with set flow and pressure is sprayed out from a nozzle of the single-flow spray gun, and liquid drops are mixed with high-temperature flue gas and then are in direct contact with the high-temperature flue gas to rapidly cool the flue gas;
and the wet electrostatic dust removal section adopts wet electrostatic dust removal equipment to perform fine dust removal on the flue gas.
2. The ultra-low purification treatment system for gas suitable for upgrading of a dry converter gas LT system as claimed in claim 1, wherein the wet electrostatic dust removal section comprises a honeycomb anode plate, a cathode wire, a suspension system and an electric field flushing system.
3. The ultra-low purification treatment system for gas suitable for upgrading of the dry method LT system of converter gas as claimed in claim 1, wherein a dehydrator is arranged between the cooling washing section and the wet method electrostatic dust removal section.
4. The ultra-low gas purification treatment system suitable for upgrading of the dry converter gas LT system as claimed in claim 3, wherein the dehydrator is in the form of an inclined plate or a folded plate.
5. The ultra-low purification treatment system for gas suitable for upgrading of the dry method LT system of converter gas as claimed in claim 2, wherein the water for the spray cooling system of the cooling and washing section and the electric field washing system of the wet electrostatic dust removal section share a turbid circulating water supply system.
6. The ultra-low gas purification treatment system suitable for upgrading the converter gas LT dry method system as claimed in claim 2, wherein the honeycomb anode plate is composed of a plurality of stainless steel or glass fiber reinforced plastic tube bundle structures with hexagonal sections, and is uniformly distributed and fixed in the shell.
7. The system for ultra-low purification of gas suitable for upgrading of a dry system LT of converter gas as claimed in claim 2, wherein the cathode wire and the suspension system comprise a plurality of cathode wires passing through the honeycomb anode plate, the upper and lower ends of the cathode wires are respectively connected and arranged on a polar wire suspension frame, the upper part of the polar wire suspension frame is suspended on a plurality of high-voltage porcelain insulators and connected with a high-frequency power supply through conducting wires, the high-voltage porcelain insulators are arranged in an insulation box, and the insulation box is arranged on the top of the system for ultra-low purification of gas suitable for upgrading of the dry system LT of converter gas.
8. The ultra-low gas purification treatment system suitable for upgrading the dry converter gas LT system as claimed in claim 7, wherein an electric heater is arranged around the high-voltage porcelain insulator, and an insulating layer is arranged outside the insulating box.
9. The ultra-low gas purification treatment system suitable for upgrading the dry converter gas LT system as claimed in claim 2, wherein the electric field flushing system is fixed in the shell by a support structure by adopting a single-layer water supply pipe network, a plurality of nozzles are uniformly distributed on the pipe network, and the water supply pipe network is connected with an external water supply pipeline.
10. The system for the upgrading of the converter gas LT dry system as claimed in claim 2, wherein an explosion venting valve is arranged at the top of the system for the upgrading of the converter gas LT dry system.
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Cited By (1)
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Inventor after: Li Xun Inventor after: Yang Qi Inventor after: Chen Yongfa Inventor after: Wei Qian Inventor after: An Jun Inventor before: Li Xun Inventor before: Yang Qi Inventor before: Chen Yongfa Inventor before: Wei Qian Inventor before: An Jun |