CN211035978U - Primary flue gas dust removal system of converter - Google Patents

Primary flue gas dust removal system of converter Download PDF

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Publication number
CN211035978U
CN211035978U CN201921459926.1U CN201921459926U CN211035978U CN 211035978 U CN211035978 U CN 211035978U CN 201921459926 U CN201921459926 U CN 201921459926U CN 211035978 U CN211035978 U CN 211035978U
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dust removal
flue gas
dust
converter
wet
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鲁亮
任乐
郝景章
徐蕾
陈明
张传波
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MCC Capital Engineering and Research Incorporation Ltd
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MCC Capital Engineering and Research Incorporation Ltd
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Abstract

The utility model discloses a flue gas dust pelletizing system once of converter. This dust pelletizing system includes: the spray tower, the circular seam venturi tube, the dehydrator, the wet electric dust remover, the dust removal fan and the subsequent dust removal device are connected in sequence; the subsequent dust removal device comprises a diffusion chimney and a gas tank. The utility model discloses utilize wet-type electric precipitation to improve the entrapment to the superfine dust, make converter smoke particulate matter emission concentration no more than 10mg/Nm3The ultra-low emission requirement is met, and meanwhile, the anti-explosion wet-type electric dust remover is arranged behind the dehydrator, and the safety and the reliability of a process system are ensured by adopting a gradient oxygen blowing model and combining the flow control of a fan.

Description

Primary flue gas dust removal system of converter
Technical Field
The utility model belongs to the technical field of metallurgical dust removal, concretely relates to flue gas dust pelletizing system once of converter.
Background
The converter generates a large amount of dust-containing coal gas, namely primary flue gas, and the dust content can reach 100g/Nm3If the air is directly discharged into the atmosphere without purification, serious air pollution can be caused.
The traditional converter primary flue gas dust removal has three technologies, namely wet dust removal, semi-dry dust removal and dry dust removal, wherein the wet dust removal accounts for more than half of the domestic proportion, and the design index of particulate matter emission is 50mg/Nm3There is also a certain increase in the particulate matter emission concentration after the system has been in operation for a period of time.
The utility model discloses a utility model application of a device and application method for converter flue gas wet-type purification with publication number CN104894329A, including converter, vaporization cooling flue, one-level scrubbing tower, second grade scrubbing tower, wet-type electrostatic precipitator, dust removal draught fan and diffusing chimney. The process flow comprises the following steps: converter flue gas enters a first-stage washing tower through a vaporization cooling flue to meet cooling water sprayed into the first-stage washing tower for heat and mass transfer, then enters a second-stage washing tower to carry out heat and mass transfer again with the cooling water sprayed into the second-stage washing tower, and then enters a wet electric dust remover, wherein the dust content of an outlet reaches 40mg/Nm3And finally, the air is sent to a diffusing chimney through a draught fan and is discharged into the atmosphere.
The dust-containing flue gas is cooled and coarsely dedusted through the two-stage washing tower, the cooling and dedusting efficiency is low, and the dust concentration at the outlet of the two-stage washing tower is 300-400 mg/Nm-3The dust concentration of the flue gas after passing through the wet-type electric dust collector is 40mg/Nm3Although better than the 50mg/Nm required by national emission limits3But cannot reach 10mg/Nm required by ultra-low emission standard3
Flue gas discharged after primary flue gas wet dust removal of traditional converterThe residual particles in the flue gas are mainly fine dust in a wet supersaturated state, so that the fine dust is effectively removed by coupling a wet electrostatic dust collector with the original wet dust removal technology, and the dust content in the flue gas is not higher than 10mg/Nm3Thereby achieving the ultra-low emission standard of the primary flue gas particles of the converter.
The utility model discloses a utility model patent of a converter primary flue gas saturation sprays dust collector with publication number CN204529899U, including converter vaporization flue, saturation spray (fog) tower, wet process venturi tube dust collector, wet process electrostatic precipitator etc.. The process flow comprises the following steps: the flue gas firstly enters a saturated spray (fog) tower through a vaporization cooling flue to carry out coarse dust removal, then enters a wet venturi dust removal device to carry out further dust removal, and finally is guided into a wet electrostatic dust remover to carry out fine dust removal, wherein the dust concentration reaches 10mg/Nm3The flue gas then enters a dehydration plant, a fan/switching station, a chimney or a gas cabinet of a subsequent dust removal system.
The wet electrostatic dust collector is arranged in front of a venturi post-dehydrator of a traditional wet dust collection system, and the flue gas is dedusted by the venturi and contains a large amount of liquid water drops containing dust particles and harmful chemical elements, so that the workload of the subsequent wet electrostatic dust collector is increased, and the corrosion to equipment, particularly polar plates and polar lines is increased; the technology prevents gas explosion by interlocking a high-voltage power supply and a converter oxygen lance, and reduces the power supply voltage to a safe area in the initial stage of oxygen blowing so as to avoid spark generation.
SUMMERY OF THE UTILITY MODEL
Based on the above background art, the utility model provides a flue gas dust pelletizing system once of converter. The utility model provides a set of flue gas dust removal system and method based on wet process dust removal of traditional converter, utilize wet-type electric precipitation to improve the entrapment to superfine dust, make a cigarette of converterThe emission concentration of gas and particulate matters is not more than 10mg/Nm3The ultra-low emission requirement is met, and meanwhile, the anti-explosion wet-type electric dust remover is arranged behind the dehydrator, and the safety and the reliability of a process system are ensured by adopting a gradient oxygen blowing model and combining the flow control of a fan.
In order to realize the above purpose, the utility model adopts the following technical scheme:
the utility model discloses an aspect provides a flue gas dust pelletizing system once of converter, and this dust pelletizing system includes: the spray tower, the circular seam venturi tube, the dehydrator, the wet electric dust remover, the dust removal fan and the subsequent dust removal device are connected in sequence; the subsequent dust removal device comprises a diffusion chimney and a gas tank.
The utility model discloses a flue gas dust pelletizing system once of converter sets up wet-type electrostatic precipitator behind the dehydrator before with dust exhausting fan, makes the liquid water content greatly reduced who gets into wet-type electrostatic precipitator's flue gas to reduce the corruption to equipment.
Primary flue gas generated by smelting of the converter enters the dust removal system of the utility model through the vaporization cooling flue; firstly, the flue gas enters a spray tower for cooling and coarse dust removal, then enters an annular seam venturi tube for fine dust removal, and the flue gas after fine dust removal enters a dehydrator for dehydration and then enters a wet-type electric precipitator for ultrafine dust removal; the dust removal fan provides power for the whole dust removal system, so that the flue gas can smoothly pass through the whole system according to the design, the flue gas subjected to dust removal treatment enters the gas holder for storage when meeting the recovery conditions, and the flue gas which does not meet the recovery conditions is ignited through the diffusing chimney and then is discharged into the atmosphere.
The utility model discloses a flue gas dust removal system is once carried out the dust removal in grades to flue gas dust of converter, and wherein the spray column is as coarse dust removal facility, and the circumferential weld venturi tube is as fine dust removal facility, and wet-type electrostatic precipitator is as superfine dust removal facility, through tertiary dust removal back, can ensure that the flue gas dust content of converter is no longer than 10mg Nm3
In the present invention, the "sequential connection" is not limited to that there are no other parts between the parts, and the pipeline connected to the parts may include other parts. The above components can be directly connected or connected through other components such as pipelines and valves.
When the converter is smelted, in order to remove carbon elements in molten iron, oxygen is blown into the converter through an oxygen lance, and the oxygen and the high-temperature molten iron undergo a violent oxidation reaction, so that primary smoke dust is generated in the process; need open when smelting the utility model discloses dust exhausting fan among the cigarette dust pelletizing system produces certain pressure at the converter mouth, makes a smoke and dust get into the utility model discloses an among the dust pelletizing system, accomplish each step of above dust removal method.
Particularly, when the dust removal system of the utility model is used for removing dust, a gradient oxygen blowing model is adopted; and the fan flow control thereof includes: in the early stage of converting, the rotating speed of a fan is set to be not lower than 85% of the highest rotating speed, and then the pressure of a furnace opening is controlled to be maintained at +/-50 Pa.
The utility model discloses a dust collector adopts gradient oxygen blowing model and combines fan flow control to ensure that the initial stage of smelting does not produce CO and O2The mixed gas is exploded, and the voltage is not required to be reduced at the initial stage of smelting, so that the dust removal effect of the whole smelting process is ensured.
In the oxygen blowing model in the prior art, the oxygen blowing amount is generally directly switched to the maximum oxygen blowing amount, namely 100 percent, without gradient control. The gradient oxygen blowing control model specifically refers to oxygen blowing amount (unit is Nm)3H) is stepped up over time.
In a preferred embodiment of the present invention, the gradient oxygen blowing model comprises the following processes: the oxygen supply amount is set to be not more than 50% of the maximum oxygen blowing amount, the first preset time is kept, and then the oxygen blowing amount is gradually increased to the maximum oxygen blowing amount which is 100% in the second preset time.
Preferably, the oxygen supply amount is set to be 40% -50% of the maximum oxygen blowing amount, the first preset time is 20-30s, and the second preset time is 45-55 s.
The existing fan flow control aims at adjusting the converter mouth pressure of a converter and maintaining the converter mouth pressure within +/-10 Pa, and after a wet electric dust remover is added in the system, in order to ensure the system safety, the fan flow control needs to control the converter mouth pressure (+/-50 Pa) and also needs to control the pressure before convertingGas composition of period to avoid CO/O formation2The rotating speed of a fan is generally set to be not lower than 85% of the highest rotating speed in the early stage of converting the mixed explosive gas, so that the CO is completely and fully combusted into CO in the early stage2
In a preferred embodiment of the present invention, the dust removing system further comprises a bypass pipeline connected in parallel with the wet electric dust remover for isolating the wet electric dust remover;
a bypass valve group is arranged on the bypass pipeline; the entrance of wet-type electrostatic precipitator is provided with entry cut-off valve group, and the exit is provided with export cut-off valve group.
When wet-type electrostatic precipitator need overhaul, can close entry cut-off valve group and export cut-off valve group to make wet-type electrostatic precipitator keep apart out from whole set of system safety, and open the bypass valves, make the flue gas get into follow-up dust removal facility smoothly, thereby will fall to minimumly to the influence of converter production.
In a preferred embodiment of the present invention, the dust removing system further comprises a three-way valve; the three-way valve is respectively connected with the dust removal fan, the diffusion chimney and the gas chamber.
Preferably, the dust removal system further comprises a water seal valve; the water seal valve is arranged on a pipeline communicated with the three-way valve and the gas chamber.
And the clean converter primary flue gas subjected to the three-stage dust removal treatment enters a three-way valve, the flue gas meeting the recovery conditions enters a gas chamber for storage after passing through a water seal valve, and the flue gas not meeting the recovery conditions is ignited through a diffusing chimney and then discharged into the atmosphere.
In a preferred embodiment of the present invention, a swirl vane is disposed in the outlet tapered tube of the wet electric dust collector.
The utility model discloses set up whirl blade in wet-type electrostatic precipitator export conical tube, can the desorption part contain dirt liquid water droplet, further reduce the dust content in the flue gas.
Preferably, the conical section of the wet electric dust collector is provided with a mechanical automatic reset explosion venting valve.
Preferably, a high-voltage power supply is arranged at the top of the wet electric dust collector. When accident explosion occurs in the wet electric dust collector, the explosion venting valve can automatically open and release the pressure in the equipment and automatically close. The high-voltage power supply positioned at the top of the wet electric dust collector provides high voltage for the work of the wet electric dust collector; the wet electric dust collector does not need to be flushed with water to form a continuous water film during working, and only a converter smelting intermittent type mode is used for flushing polar lines of the polar plates so as to clean dust collected on the polar lines; because the intermittent flushing is adopted, a continuous water film is not needed, and the system saves more water and energy.
The utility model discloses another aspect is corresponding provides a converter flue gas dust removal method, including following step:
the primary flue gas enters a spray tower through a vaporization cooling flue to be cooled and subjected to coarse dust removal;
the flue gas after coarse dust removal enters an annular seam venturi tube for fine dust removal;
the flue gas after fine dust removal enters a dehydrator for dehydration;
the dehydrated flue gas enters a wet electric dust remover to carry out superfine dust removal;
the flue gas after the superfine dust removal meets the recovery conditions and enters a gas chamber for storage, and the flue gas which does not meet the recovery conditions is ignited through a diffusing chimney and then discharged into the atmosphere.
When the converter is smelted, in order to remove carbon elements in molten iron, oxygen is blown into the converter through an oxygen lance, and the oxygen and the high-temperature molten iron undergo a violent oxidation reaction, so that primary smoke dust is generated in the process; need open when smelting the utility model discloses a dust exhausting fan among the cigarette dust pelletizing system produces certain pressure at the converter mouth, makes a smoke and dust get into the utility model discloses an among the dust pelletizing system, accomplish each step of above dust removal method.
Preferably, a gradient oxygen blowing model is adopted in the converter primary flue gas dedusting method;
and the adopted fan flow control comprises the following steps: in the early stage of converting, the rotating speed of a fan is set to be not lower than 85% of the highest rotating speed, and then the pressure of a furnace opening is controlled to be maintained at +/-50 Pa.
The process of the primary flue gas dust removal method of the converter adopts gradient oxygen blowingThe model is combined with the fan flow control to ensure that CO and O are not generated in the initial smelting stage2The mixed gas is exploded, and the voltage is not required to be reduced at the initial stage of smelting, so that the dust removal effect of the whole smelting process is ensured.
In the oxygen blowing model in the prior art, the oxygen blowing amount is generally directly switched to the maximum oxygen blowing amount, namely 100 percent, without gradient control. The gradient oxygen blowing control model specifically refers to oxygen blowing amount (unit is Nm)3H) is stepped up over time.
In a preferred embodiment of the present invention, the gradient oxygen blowing model comprises the following processes: the oxygen supply amount is set to be not more than 50% of the maximum oxygen blowing amount, the first preset time is kept, and then the oxygen blowing amount is gradually increased to the maximum oxygen blowing amount which is 100% in the second preset time.
Preferably, the amount of oxygen is set to 40% -50% of the maximum amount of oxygen blown.
Preferably, the first preset time is 20-30s, and the second preset time is 45-55 s.
The existing fan flow control aims at adjusting the converter mouth pressure of a converter and maintaining the converter mouth pressure within +/-10 Pa, and after a wet electric dust remover is added in the system, in order to ensure the system safety, the fan flow control needs to control the gas components in the early stage of converting besides controlling the converter mouth pressure (+/-50 Pa), so as to avoid forming CO/O2The rotating speed of a fan is generally set to be not lower than 85% of the highest rotating speed in the early stage of converting the mixed explosive gas, so that the CO is completely and fully combusted into CO in the early stage2
Preferably, when the wet electric dust collector needs to be overhauled, the wet electric dust collector is isolated from the device by using a bypass pipeline arranged in parallel with the wet electric dust collector, so that the flue gas enters a subsequent dust removal facility from the bypass pipeline, and the influence on the production of the converter is reduced to the minimum.
For example in the preferred embodiment of the utility model, when wet-type electrostatic precipitator need overhaul, can close entry cut-off valve group and export cut-off valve group to make wet-type electrostatic precipitator come out from the safety isolation in the dust pelletizing system, and open the bypass valves, make the flue gas get into follow-up dust removal facility smoothly, thereby will fall to minimumly to the influence of converter production.
Preferably, the flue gas after the superfine dust removal (namely the primary flue gas of the clean converter after the three-stage dust removal treatment) enters a three-way valve, the flue gas which meets the recovery conditions enters a gas chamber for storage after being regulated by the three-way valve and passing through a water seal valve, and the flue gas which does not meet the recovery conditions enters a diffusion chimney to be ignited and then is discharged into the atmosphere after being regulated by the three-way valve.
Preferably, turbid annular drainage water generated by all parts in the primary flue gas dedusting process of the converter is merged and then sent to a water treatment system.
Preferably, the polar plate polar line of the wet electric dust collector is flushed by using a converter smelting intermittent mode so as to clean the dust collected on the polar plate polar line.
The utility model discloses wet process dust removal technical is gone up through novel wet-type explosion-proof electrostatic precipitator and is improved the entrapment to fine dust, consider the reaction of CO content and oxygen blast in the flue gas of converter simultaneously and generate the law, adopt special gradient oxygen blast model and combine fan flow control, do not produce explosive mist in whole converting process, the device is simple, reliable, safety, area is little, both be applicable to wet process dust removal of newly-built converter and also can be used to reform transform original wet process dust removal, the flue gas particulate matter ultralow emission of realization that the homoenergetic is fine.
The utility model discloses following beneficial effect has:
1) the utility model discloses a process flow make full use of the characteristics of flue gas of converter, take the dust removal theory of grading, utilize the spray column to carry out coarse dust removal, utilize the circumferential weld venturi tube to carry out the essence and remove dust, utilize wet-type electric precipitation to carry out the ultrafine particle and remove dust respectively, the converter flue gas particulate matter of emission reaches 10mg Nm3The purified qualified coal gas can be directly sent to a gas holder for use by users, so that the primary flue gas of the converter is more economical and environment-friendly.
2) According to the smelting characteristics of the converter, a specific gradient oxygen blowing control model is adopted and fan flow control is combined to ensure that CO and O are not generated in the initial smelting stage2The mixed gas is exploded, thereby ensuring the safety and reliability of the system on the premise of ensuring the dust removal effect.
3) The wet electric dust remover is arranged behind the dehydrator, so that the water content of the liquid entering the flue gas in the electric dust remover is greatly reduced, the corrosion to equipment is reduced, and the service life of the equipment is longer. And because the intermittent flushing is adopted, a continuous water film is not needed, and the system saves more water and energy.
4) The wet-type electric dust remover is connected with the bypass valve group in parallel, and the wet-type electric dust remover can be isolated from the system quickly and safely when the wet-type electric dust remover needs to be overhauled, so that the influence on the production of the converter is reduced to the minimum.
Drawings
Fig. 1 is a schematic view of a converter primary flue gas dust removal system and a process in a preferred embodiment of the present invention.
Fig. 2 is a graph showing the effect of the gradient oxygen blowing model in combination with the flow control of the blower in the preferred embodiment of the present invention.
Description of reference numerals:
01-a vaporization cooling flue; 02-converter; 1-a spray tower; 2-a circumferential seam venturi; 3-a dehydrator; 4-explosion-proof wet-type electric dust collector; 4.1-explosion venting valve; 4.2-high voltage power supply; 4.3-inlet shut-off valve set; 4.4-outlet shut-off valve block; 5-a bypass valve bank; 6-a dust removal fan; 7-a three-way valve; 8-water seal valve; 9-diffusing a chimney; 10-gas chamber.
Detailed Description
In order to illustrate the invention more clearly, the invention is further described below with reference to preferred embodiments. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
The utility model provides a preferred embodiment, as shown in figure 1, a converter primary flue gas dust removal system comprises a spray tower 1, a circular seam venturi tube 2, a dehydrator 3, a wet electric dust remover 4 and a dust removal fan 6 which are connected in sequence; the dust removal fan 6 is connected with a diffusion chimney 9 and a gas chamber 10 through a three-way valve 7.
Wherein, set up wet-type electrostatic precipitator 4 behind dehydrator 3 and before dust removal fan 6, make the liquid water content of the flue gas that gets into wet-type electrostatic precipitator 4 greatly reduced to reduce the corruption to equipment.
The primary flue gas from the converter 02 enters a dust removal system through a vaporization cooling flue 01; firstly, the flue gas enters a spray tower 1 for cooling and coarse dust removal, then enters an annular seam venturi tube 2 for fine dust removal, and the flue gas after fine dust removal enters a dehydrator 3 for dehydration and then enters a wet electric dust remover 4 for ultrafine dust removal; the dust removal fan 6 provides power for the whole dust removal system, so that the flue gas can smoothly pass through the whole system according to the design, the cleaned primary flue gas of the converter after dust removal treatment enters the gas chamber 10 to be stored when the recovery conditions are met, and the flue gas which does not meet the recovery conditions is ignited through the diffusion chimney 9 and then is discharged into the atmosphere.
The dust removal system carries out graded dust removal on primary flue gas dust of the converter, wherein the spray tower is used as a coarse dust removal facility, the circular seam venturi tube is used as a fine dust removal facility, the wet electric dust remover is used as a superfine dust removal facility, and after three-level dust removal, the dust content of the primary flue gas dust of the converter can be ensured not to exceed 10mg/Nm3
Furthermore, a bypass pipeline is connected in parallel with the wet electric dust collector 4; a bypass valve group 5 is arranged on the bypass pipeline; an inlet cut-off valve group 4.3 is arranged at the inlet of the wet electric dust collector, and an outlet cut-off valve group 4.4 is arranged at the outlet of the wet electric dust collector. When wet-type electrostatic precipitator 4 need overhaul, can close entry cut-off valve group 4.3 and export cut-off valve group 4.4 to make wet-type electrostatic precipitator 4 come out from whole system safety isolation, and open bypass valves 5, make the flue gas get into follow-up dust removal facility smoothly, thereby will fall to minimumly to the influence of converter production.
The conical section of the wet electric dust collector 4 is provided with a mechanical automatic reset explosion venting valve 4.1, and the top of the wet electric dust collector is provided with a high-voltage power supply 4.2. When accident explosion occurs in the wet electric dust collector 4, the explosion venting valve 4.1 can automatically open and release the pressure in the equipment and automatically close. The high-voltage power supply 4.2 provides high voltage electricity for the operation of the wet electric dust collector 4; the wet electric dust collector 4 does not need to be flushed with water to form a continuous water film during working, and only a converter smelting intermittent type mode is used for flushing polar lines of the polar plates so as to clean dust collected on the polar lines; because the intermittent flushing is adopted, a continuous water film is not needed, and the system saves more water and energy.
With this dust pelletizing system supporting adoption gradient oxygen blowing model to its fan flow control includes: in the early stage of converting, the rotating speed of a fan is set to be not lower than 85% of the highest rotating speed, and then the pressure of a furnace opening is controlled to be maintained at +/-50 Pa.
The utility model discloses a dust pelletizing system adopts gradient oxygen blowing model and combines fan flow control to ensure that the initial stage of smelting does not produce CO and O2The mixed gas is exploded, and the voltage is not required to be reduced at the initial stage of smelting, so that the dust removal effect of the whole smelting process is ensured.
In the oxygen blowing model in the prior art, the oxygen blowing amount is generally directly switched to the maximum oxygen blowing amount, namely 100 percent, without gradient control. The gradient oxygen blowing control model specifically refers to oxygen blowing amount (unit is Nm)3H) is increased in steps with time, the oxygen supply amount is generally set to be not more than 50% of the maximum oxygen blowing amount, the oxygen supply amount is kept for 20-30s, and then the oxygen blowing amount is gradually increased to the maximum oxygen blowing amount of 100% within 45-55 s.
The existing fan flow control aims at adjusting the converter mouth pressure of a converter and maintaining the converter mouth pressure within +/-10 Pa, and after a wet electric dust remover is added in the system, in order to ensure the system safety, the fan flow control needs to control the gas components in the early stage of converting besides controlling the converter mouth pressure (+/-50 Pa), so as to avoid forming CO/O2The rotating speed of a fan is generally set to be not lower than 85% of the highest rotating speed in the early stage of converting the mixed explosive gas, so that the CO is completely and fully combusted into CO in the early stage2
The dust removal process of the preferred embodiment includes:
1) the primary flue gas from the converter 02 enters the dedusting system through the evaporative cooling flue 01.
2) The primary flue gas of the dust-containing converter with the temperature of about 1000 ℃ firstly enters the spray tower 1, atomized water is sprayed into the flue gas at an inlet, latent heat of the water is utilized to absorb heat and then evaporate, the temperature of the flue gas is reduced to be below the saturation temperature, generally 65 ℃, large particle dust in the flue gas is captured by water drops while the temperature is reduced, turbid ring drainage is formed, and the large particle dust is settled to the bottom of the spray tower, so that the coarse dust removal of the flue gas is completed.
3) The flue gas after coarse dust removal enters an annular gap venturi 2 for fine dust removal, and the dust concentration at the outlet is not more than 50mg/Nm3
4) The flue gas after fine dust removal enters a dehydrator 3 to remove part of liquid water in the flue gas, and then enters a wet electric dust remover 4 to perform ultrafine particle dust removal, so that the dust concentration at the outlet is not more than 10mg/Nm3When the ultra-low emission standard is met, a mechanical automatic reset explosion venting valve 4.1 is arranged at the conical section of the wet electric dust collector 4, and when accident explosion occurs in the wet electric dust collector 4, the explosion venting valve 4.1 can automatically open and release the pressure in equipment and automatically close; the high-voltage power supply 4.2 positioned at the top of the wet electric dust collector 4 provides high voltage electricity for the work of the wet electric dust collector 4; the wet electric dust collector 4 does not need to be flushed with water to form a continuous water film during working, and the polar plate line is flushed with water only when the converter smelting is interrupted, so that the collected dust on the polar plate line is cleaned.
5) Set up one set of bypass valves 5 and the parallelly connected use of wet-type electrostatic precipitator 4, when wet-type electrostatic precipitator 4 need overhaul, close entry cut-off valve group 4.3 and export cut-off valve group 4.4 to make wet-type electrostatic precipitator 4 isolate out from dust pelletizing system fast safety, and open bypass valves 5, make the flue gas get into follow-up dust removal facility smoothly.
6) The dust removal fan 6 provides power for the whole dust removal system, and ensures that the flue gas smoothly passes through the whole system according to the design.
7) The clean converter primary flue gas after the three-stage dust removal treatment enters a three-way valve 7, the coal gas meeting the recovery conditions enters a coal gas cabinet 10 for storage after passing through a water seal valve 8, and the coal gas not meeting the recovery conditions is ignited through a diffusion chimney 9 and then discharged into the atmosphere.
In the process, a graph of the effect of the gradient oxygen blowing model combined with the flow control of the fan is shown in figure 2, wherein the X axis represents the oxygen blowing time(s), the Y axis represents the percentage, and as can be seen from the graph, the growth rate of the CO content is slow and the O content is controlled by the gradient oxygen blowing model combined with the flow control of the fan in the blowing early stage (about 0-120 s)2The content of the cross point is between 5 and 6 percent, and the generation of explosive gas environment is avoided from the source in a safe range.
In the preferred embodiment, the process of the gradient oxygen blowing model includes the following processes: the amount of oxygen blowing was set to 50% of the maximum amount of oxygen blowing and maintained for about 20 seconds, and then the amount of oxygen blowing was gradually increased to the maximum amount of oxygen blowing, i.e., 100%, within 50 seconds. The process of fan flow control comprises the following steps: in the early stage of converting, the rotating speed of a fan is set to be 85% of the maximum rotating speed, and then the pressure of a furnace opening is controlled to be maintained at +/-50 Pa.
Obviously, the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it is obvious for those skilled in the art to make other variations or changes based on the above descriptions, and all the embodiments cannot be exhausted here, and all the obvious variations or changes that belong to the technical solutions of the present invention are still in the protection scope of the present invention.

Claims (8)

1. The utility model provides a converter primary flue gas dust pelletizing system which characterized in that, this dust pelletizing system includes: the spray tower, the circular seam venturi tube, the dehydrator, the wet electric dust remover, the dust removal fan and the subsequent dust removal device are connected in sequence; the subsequent dust removal device comprises a diffusion chimney and a gas tank.
2. The converter primary flue gas dedusting system of claim 1, further comprising a bypass line arranged in parallel with the wet electric precipitator for isolating the wet electric precipitator.
3. The converter primary flue gas dedusting system of claim 2, wherein a bypass valve set is arranged on the bypass pipeline; the entrance of wet-type electrostatic precipitator is provided with entry cut-off valve group, and the exit is provided with export cut-off valve group.
4. The converter primary flue gas dust removal system of claim 1, further comprising a three-way valve; the three-way valve is respectively connected with the dust removal fan, the diffusion chimney and the gas chamber.
5. The converter primary flue gas dust removal system of claim 4, further comprising a water seal valve; the water seal valve is arranged on a pipeline communicated with the three-way valve and the gas chamber.
6. The primary flue gas dedusting system for a converter according to claim 1, wherein a swirl vane is arranged in an outlet tapered tube of the wet electric precipitator.
7. The converter primary flue gas dust removal system of claim 1, wherein the conical section of the wet electric precipitator is provided with a mechanical automatic reset explosion venting valve.
8. The converter primary flue gas dust removal system of claim 7, wherein a high voltage power supply is arranged at the top of the wet electric dust collector.
CN201921459926.1U 2019-09-03 2019-09-03 Primary flue gas dust removal system of converter Active CN211035978U (en)

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Application Number Priority Date Filing Date Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112442567A (en) * 2019-09-03 2021-03-05 中冶京诚工程技术有限公司 Converter primary flue gas dedusting method and system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112442567A (en) * 2019-09-03 2021-03-05 中冶京诚工程技术有限公司 Converter primary flue gas dedusting method and system

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