CN116943406A - Online replacement method and system for desulfurizing agent of flue gas purification system - Google Patents
Online replacement method and system for desulfurizing agent of flue gas purification system Download PDFInfo
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- CN116943406A CN116943406A CN202310866365.1A CN202310866365A CN116943406A CN 116943406 A CN116943406 A CN 116943406A CN 202310866365 A CN202310866365 A CN 202310866365A CN 116943406 A CN116943406 A CN 116943406A
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- replacement
- desulfurization
- desulfurizing agent
- desulfurizing
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- 230000003009 desulfurizing effect Effects 0.000 title claims abstract description 248
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 202
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 118
- 239000003546 flue gas Substances 0.000 title claims abstract description 118
- 238000000746 purification Methods 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 229
- 230000023556 desulfurization Effects 0.000 claims abstract description 229
- 239000000428 dust Substances 0.000 claims abstract description 56
- 239000000779 smoke Substances 0.000 claims abstract description 33
- 239000007789 gas Substances 0.000 claims description 42
- 238000001514 detection method Methods 0.000 claims description 38
- 238000007599 discharging Methods 0.000 claims description 14
- 238000004140 cleaning Methods 0.000 claims description 8
- 238000012163 sequencing technique Methods 0.000 claims description 7
- 230000001360 synchronised effect Effects 0.000 claims description 6
- 238000012423 maintenance Methods 0.000 claims description 5
- 230000007613 environmental effect Effects 0.000 abstract description 24
- 238000004519 manufacturing process Methods 0.000 abstract description 11
- 238000012216 screening Methods 0.000 abstract description 9
- 229910052815 sulfur oxide Inorganic materials 0.000 description 82
- 238000006073 displacement reaction Methods 0.000 description 13
- 238000010586 diagram Methods 0.000 description 8
- 239000003517 fume Substances 0.000 description 7
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 230000008707 rearrangement Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical class S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/508—Sulfur oxides by treating the gases with solids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/30—Controlling by gas-analysis apparatus
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/81—Solid phase processes
- B01D53/82—Solid phase processes with stationary reactants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses an online replacement method and system for a desulfurizing agent of a flue gas purification system. The method comprises the following steps: obtaining SO in smoke components in chimney 2 Concentration and dust content; if SO in the smoke component 2 The concentration is larger than a first threshold value, and SO in a plurality of desulfurization units is obtained 2 Concentration and dust content; for SO in the plurality of desulfurization units 2 Identifying desulfurization units with the concentration within a second threshold range; and carrying out online replacement on the identified desulfurizing agent in the desulfurizing unit. The screening and the desulfurizing agent replacement of the desulfurizing unit are completed in an on-line production state, the aim of effectively utilizing resources is fulfilled, and the desulfurizing agent replacement process meets the environmental protection requirement, the economical efficiency and the system integrity.
Description
Technical Field
The embodiment of the invention relates to the technical field of flue gas purification of hot blast stoves, in particular to an online replacement method and system for a desulfurizing agent of a flue gas purification system.
Background
The flue gas purifying fixed bed technological desulfurizing device for hot blast furnace consists of several independent desulfurizing units assembled in modular mode, and the flue gas enters from the bottom of the desulfurizing units and contacts with desulfurizing agent from bottom to top, and the purified flue gas is exhausted from the top and collected to the chimney.
The desulfurizing agent in each desulfurizing unit has a certain effective service period, and if SO is detected in the process of detecting the discharged fume 2 The content is close to the upper limit of the environmental protection requirement, and the desulfurizing agent in the desulfurizing unit is required to be replaced, so that the discharged fume is ensured to meet the environmental protection requirement.
Disclosure of Invention
The invention provides an online replacement method and system for desulfurizing agents of a flue gas purification system, which are used for orderly and periodically replacing the desulfurizing agents in a unit desulfurizing device in turn, so that the replacement process of the desulfurizing agents meets the environmental protection requirements, the economical efficiency and the system integrity.
In a first aspect, an embodiment of the present invention provides an online replacement method for a desulfurizing agent in a flue gas purification system, including:
obtaining SO in smoke components in chimney 2 Concentration and dust content;
if saidSO in flue gas component 2 The concentration is larger than a first threshold value, and SO in a plurality of desulfurization units is obtained 2 Concentration and dust content;
for SO in the plurality of desulfurization units 2 Identifying desulfurization units with the concentration within a second threshold range;
and carrying out online replacement on the identified desulfurizing agent in the desulfurizing unit.
Optionally, the online replacement of the desulfurizing agent in the identified desulfurizing unit includes:
SO for the identified desulfurization unit 2 Sequencing the concentration from high to low;
and sequentially replacing the desulfurizing agent of the desulfurizing units according to the sequencing.
Optionally, the online replacement of the desulfurizing agent in the identified desulfurizing unit includes:
carrying out online replacement on the desulfurizing agent through a desulfurizing agent replacement groove position in the desulfurizing unit; and the replacement amount of the desulfurizing agent replacement groove position is used for replacing the desulfurizing agent in the desulfurizing unit according to a preset replacement standard.
Optionally, the online replacement of the desulfurizing agent in the identified desulfurizing unit includes:
carrying out online replacement on the desulfurizing agent through a desulfurizing agent replacement groove position in the desulfurizing unit; and the replacement amount of the desulfurizing agent replacement groove position is used for replacing the desulfurizing agent in the desulfurizing unit according to a preset replacement standard.
Optionally, the online replacement of the desulfurizing agent in the identified desulfurizing unit further includes:
if SO is contained in the smoke component 2 And if the concentration is greater than 1% of the first threshold value, increasing the replacement amount of the desulfurizing agent replacement tank according to a first preset value on the basis of a preset replacement reference.
Optionally, the online replacement of the desulfurizing agent in the identified desulfurizing unit further includes:
if the dust content in the desulfurization unit is larger than the first preset dust content, the replacement amount of the desulfurizing agent replacement tank is increased according to a second preset value.
Optionally, the online replacement of the desulfurizing agent in the identified desulfurizing unit further includes:
if the number of the desulfurization units is greater than the preset number, and the synchronous replacement probability of the desulfurization units and the blast furnace maintenance is less than or equal to 50%, the replacement amount of the desulfurizing agent replacement groove is increased according to a third preset value.
Optionally, the online replacement of the desulfurizing agent in the identified desulfurizing unit includes:
isolating the identified desulfurization unit from a flue gas purification system;
compressed air is introduced into the identified desulfurization unit, and the gas in the identified desulfurization unit is replaced until the gas in the identified desulfurization unit is detected to be qualified;
and carrying out online replacement of the desulfurizing agent on the identified desulfurizing unit, and re-communicating the identified desulfurizing unit with the flue gas purifying system.
In a second aspect, the embodiment of the invention also provides an online replacement system for a desulfurizing agent of a flue gas purification system, which is used for executing the online replacement method for the desulfurizing agent of the flue gas purification system, and comprises the flue gas purification system, a detection module and a replacement module;
the flue gas purification system comprises a desulfurization device, a chimney and an external flue, wherein the desulfurization device is connected with the chimney through the external flue and is used for purifying flue gas and discharging the purified flue gas from the chimney; wherein the desulfurization device comprises a plurality of desulfurization units;
the detection module comprises a first detection module and a second detection module, and the first detection module is used for acquiring SO in the smoke components in the chimney 2 The second detection module is used for acquiring SO in the plurality of desulfurization units 2 Concentration and dust content;
the replacement module is used for replacing SO in the plurality of desulfurization units 2 Concentration in a second threshold rangeThe desulfurization units in the enclosure are marked, and the desulfurizing agents in the marked desulfurization units are replaced on line.
Further, the desulfurization device further comprises an air outlet pipeline system, an air inlet pipeline system and a gas replacement pipeline system;
the input end of the air inlet pipeline system is connected with a hot blast stove smoke exhaust pipeline, and the output end of the air inlet pipeline system is connected with the desulfurization unit and is used for transmitting smoke exhausted by the hot blast stove to the desulfurization unit;
the input end of the air outlet pipeline system is connected with the desulfurization unit, and the output end of the air outlet pipeline system is connected with the external flue and is used for transmitting purified flue gas to the external flue;
the input end of the gas replacement pipeline system is connected with compressed air, and the output end of the gas replacement pipeline system is connected with the desulfurization unit and is used for transmitting the compressed air to the desulfurization unit before replacing the desulfurizing agent.
Further, the replacement module comprises a desulfurizing agent replacement tank, a charging system and a discharging system;
the desulfurizing agent replacement tank is positioned in the desulfurizing unit and is used for carrying out online replacement on the desulfurizing agent in the desulfurizing unit;
the feeding system is positioned above the desulfurization unit and is used for adding a desulfurizing agent into the desulfurization unit;
the discharging system is positioned below the desulfurization unit and is used for discharging the desulfurizing agent in the desulfurization unit so as to complete the replacement of the desulfurizing agent.
The invention discloses an online replacement method and system for a desulfurizing agent of a flue gas purification system, which are used for obtaining SO in flue gas components in a chimney 2 Concentration and dust content, if SO in the flue gas component 2 The concentration is larger than a first threshold value, and SO in a plurality of desulfurization units is obtained 2 Concentration and dust content for SO in multiple desulfurization units 2 The desulfurization units with the concentration within the second threshold range are identified, so that when the smoke components do not meet the environmental protection requirement, whether the desulfurization agents in the desulfurization units need to be replaced or not is judged, the desulfurization units needing to be replaced are identified, andand the desulfurizer in the identified desulfurization units is subjected to online replacement, so that the desulfurization units needing to be subjected to the desulfurizer replacement are subjected to the desulfurizer replacement, the excessive replacement of the desulfurizer is avoided, the screening and the desulfurizer replacement of the desulfurization units are completed in an online production state, the aim of effectively utilizing resources is fulfilled, and the replacement process of the desulfurizer meets the environmental protection requirement, the economical efficiency and the system integrity.
Drawings
FIG. 1 is a flow chart of an online replacement method for desulfurizing agent of a flue gas purification system, which is provided by the embodiment of the invention.
Fig. 2 is a schematic structural diagram of a flue gas purifying system according to an embodiment of the present invention.
FIG. 3 is a flow chart of online replacement of desulfurizing agent by a desulfurizing agent replacement tank provided by the embodiment of the invention.
Fig. 4 is a schematic structural diagram of an online replacement system for desulfurizing agent of a flue gas purification system according to an embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a flue gas purifying system and a detecting module according to an embodiment of the present invention.
FIG. 6 is a schematic diagram of a pipeline structure of a single desulfurization unit in a desulfurization apparatus according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Fig. 1 is a flow chart of an online replacement method for a desulfurizing agent of a flue gas purification system provided by an embodiment of the present invention, and fig. 2 is a schematic structural diagram of a flue gas purification system provided by an embodiment of the present invention, where the embodiment is applicable to online replacement of a desulfurizing agent in a flue gas purification system of a hot blast stove, and the method may be performed by an online replacement system for a desulfurizing agent of a flue gas purification system, as shown in fig. 1, and specifically includes the following steps:
s110, acquiring SO in smoke components in the chimney 2 Concentration and dust content.
Wherein a large amount of coal is burned in the production flow of the thermal power plant, and the coal often contains a certain amount of sulfur elements, and the sulfur element-containing coal releases a large amount of SO after burning 2 And dust fume, if not treated, is directly discharged into the outside air, and serious pollution is caused to the atmospheric environment, so that the fume discharged from the hot blast stove is required to be desulfurized and purified. As shown in fig. 2, in the flue gas purification system, flue gas discharged from the hot blast stove enters the desulfurization device from the flue gas discharge pipeline of the hot blast stove, and the flue gas is desulfurized by the desulfurizing agent in the desulfurization device, SO that SO in the flue gas is reduced 2 The content and the dust content, the flue gas after desulfurization by the desulfurization device enters a chimney from an external flue and is discharged from the chimney, and the flue gas purification process is completed. In addition, the desulfurizing device comprises a plurality of desulfurizing units, the desulfurizing agents in the desulfurizing units have a certain effective service cycle, and in the flue gas detection in a chimney, if SO is carried out 2 The content is close to the upper limit of the environmental protection requirement, and the desulfurizing agent in the desulfurizing unit is required to be replaced, so that the discharged fume is ensured to meet the environmental protection requirement. Thus, SO in the smoke component in the chimney can be detected on line by installing the smoke on-line detection device in the chimney 2 And determining whether the discharged fume accords with the environmental protection standard or not, and determining whether the desulfurizing agent in the desulfurizing unit needs to be replaced or not.
S120, if SO in the smoke component 2 The concentration is larger than a first threshold value, and SO in a plurality of desulfurization units is obtained 2 Concentration and dust content.
With continued reference to fig. 2, the desulfurizing device includes a plurality of desulfurizing units to simultaneously perform desulfurization and purification on the flue gas discharged from the hot blast stove, and can reduce the dust content in the flue gas discharged from the hot blast stove. Each desulfurization unit contains a certain amount of desulfurizing agent, and when the desulfurizing agent in part of the desulfurization units fails or the service period is longer, the desulfurization effect of the desulfurization units on the flue gas is reduced, SO that SO in the flue gas components in the chimney is caused 2 Concentration and dust contentThe amount is increased, SO that SO for each of the plurality of desulfurization units can be obtained 2 And detecting the concentration and the dust content. When SO in a certain desulfurization unit 2 The higher concentration and dust content indicates that the desulfurizing agent in the desulfurizing unit needs to be replaced. When SO in the smoke component in the chimney is detected 2 When the concentration is larger than the first threshold value, determining that a desulfurization unit needing to be subjected to desulfurizing agent replacement exists, and continuously detecting SO in a plurality of desulfurization units 2 And determining the concentration and dust content of the desulfurization unit needing to replace the desulfurizing agent. Alternatively, the first threshold may be the SO of the flue gas in the environmental control target 2 90% of the concentration.
Optionally, a movable flue gas online detection system can be arranged in the desulfurization device, SO that the SO in the flue gas components is determined 2 When the concentration is greater than a first threshold value, SO in a plurality of desulfurization units in the desulfurization device is treated 2 And detecting the concentration and the dust content.
S130, for SO in a plurality of desulfurization units 2 Desulfurization units having concentrations within a second threshold range are identified.
Wherein the mark can indicate that the marked desulfurization unit needs to be subjected to desulfurizing agent replacement, and the second threshold range can be flue gas SO in the environmental protection control target 2 80% -90% of the concentration. By reacting SO in a plurality of desulfurization units 2 The desulfurization units having concentrations within the second threshold range are identified, and desulfurization units requiring replacement with a desulfurizing agent are determined.
S140, online replacement is carried out on the desulfurizing agent in the identified desulfurizing unit.
In particular, on-line detection of SO in flue gas components 2 Concentration greater than a first threshold, and SO in the desulfurization unit 2 When the concentration is within the second threshold range, the concentration can be controlled according to SO in the desulfurization unit 2 The concentration is used for sequencing the marked desulfurization units, and the desulfurizing agents in the desulfurization units are sequentially replaced on line, SO that the normal operation of a flue gas purification system is not influenced, and the detection of SO in flue gas by an outer flue is ensured 2 And the dust content meets the environmental protection requirement, and the screening of the desulfurization unit and the desulfurization agent placement are completed under the online production stateAnd (5) changing.
The invention discloses an online replacement method for a desulfurizing agent of a flue gas purification system, which comprises the steps of obtaining SO in flue gas components in a chimney 2 Concentration and dust content, if SO in the flue gas component 2 The concentration is larger than a first threshold value, and SO in a plurality of desulfurization units is obtained 2 Concentration and dust content for SO in multiple desulfurization units 2 The desulfurization units with the concentration within the second threshold range are identified, so that when the smoke components do not meet the environmental protection requirement, whether the desulfurization agents in the desulfurization units need to be replaced or not is judged, the desulfurization units needing to be replaced are identified, the desulfurization agents in the identified desulfurization units are replaced on line, the desulfurization units needing to be replaced by the desulfurization agents are replaced, excessive replacement of the desulfurization agents is avoided, screening of the desulfurization units and replacement of the desulfurization agents are completed in an on-line production state, the purpose of effectively utilizing resources is achieved, and the replacement process of the desulfurization agents meets the environmental protection requirement, economy and system integrity.
Optionally, performing online replacement on the desulfurizing agent in the identified desulfurizing unit, including: SO for identified desulfurization units 2 Sequencing the concentration from high to low; and sequentially replacing the desulfurizing agents of the desulfurizing units according to the sequence.
Wherein SO in the desulfurization unit 2 Higher concentration means poorer desulfurization effect of the desulfurizing agent in the desulfurization unit by SO for the identified desulfurization unit 2 Sequencing the concentration from high to low, preferentially replacing the desulfurizing agent of the desulfurizing units with poorer desulfurizing effect of the desulfurizing agent in the desulfurizing units, and sequentially replacing the desulfurizing agent of the desulfurizing units in sequence to ensure that SO (sulfur oxides) detected in the flue gas 2 The concentration meets the environmental protection requirement as soon as possible.
Optionally, performing online replacement on the desulfurizing agent in the identified desulfurizing unit, including: carrying out online replacement on the desulfurizing agent through a desulfurizing agent replacement groove position in the desulfurizing unit; wherein, the replacement amount of the desulfurizing agent replacement groove position is used for replacing the desulfurizing agent in the desulfurizing unit according to a preset replacement standard.
Specifically, the desulfurizing unit comprises a desulfurizing agent replacement tank, the desulfurizing agent replacement tank can regulate and control the replacement amount of the desulfurizing agent, and all the desulfurizing agents in the desulfurizing unit are not directly replaced, so that the aim of most effectively utilizing resources is fulfilled. Alternatively, the preset replacement criterion is 50% of the standard desulfurizing agent content designed in the desulfurizing unit, and the formula can be expressed as:
C datum ＝C Design criteria *50％；
Wherein C is Datum C, a preset replacement reference for replacing the tank position with the desulfurizing agent Design criteria Standard desulfurizing agent content designed for the desulfurization unit.
Specifically, fig. 3 is a flow chart of online replacement of a desulfurizing agent by a desulfurizing agent replacement tank provided in an embodiment of the present invention, wherein online replacement of the desulfurizing agent by the desulfurizing agent replacement tank in a desulfurizing unit includes the following steps:
s1401, if SO in smoke component 2 And if the concentration is greater than 1% of the first threshold value, increasing the replacement amount of the desulfurizing agent replacement tank according to a first preset value on the basis of a preset replacement reference.
The first preset value may be 1 to 1.25% of the standard desulfurizing agent content designed in the desulfurizing unit. SO in smoke component 2 The concentration is greater than 1% of the first threshold, the displacement of the displacement slot of the desulfurization unit is increased in a gradient manner according to 1-1.25% of the content of the standard desulfurizing agent designed in the desulfurization unit, and the SO in the flue gas is exemplified 2 The content is 92 percent, the first threshold value is 90 percent, and SO in the smoke component is obtained 2 The concentration is more than 2% of the first threshold value, and the replacement amount of the replacement slot position of the desulfurization unit is increased by 2-2.5% on the basis of a preset replacement reference. SO in smoke component 2 The displacement amount of the desulfurizing agent displacement tank when the concentration is greater than the first threshold value can be expressed as:
C 1 ＝C datum +(N-N 1 )*C A first preset value ；
Wherein C is 1 Is SO in the smoke component 2 The replacement amount of the desulfurizing agent replacement tank position when the concentration is larger than a first threshold value, wherein N is SO in the smoke component 2 Concentration, N 1 Is a first threshold value, C A first preset value Is a first preset value.
S1402, if the dust content in the desulfurization unit is larger than the first preset dust content, increasing the replacement amount of the desulfurizing agent replacement tank according to the second preset value.
The first preset dust content range can be 80-90% of the dust content in the smoke in the environment-friendly control target. In order to prevent the dust content of the subsequent discharged fume from exceeding the standard, if the dust content in the desulfurization unit is larger than the first preset dust content, the replacement amount of the desulfurizing agent replacement tank is increased in a gradient manner according to a second preset value. When the dust content in the desulfurization unit is greater than the first preset dust content, the replacement amount of the desulfurizing agent replacement tank position can be expressed as follows:
C 2 ＝C datum +(N-N 1 )*C A first preset value +(F-F 1 )C A second preset value ；
Wherein C is 2 F is the dust content in the desulfurization unit, F is the replacement amount of the replacement tank position of the desulfurizing agent when the dust content in the desulfurization unit is larger than the first preset dust content 1 For the first preset dust content, C A second preset value Is a second preset value.
S1403, if the number of the desulfurization units is greater than the preset number, and the synchronous replacement probability of the desulfurization units and the blast furnace maintenance is less than or equal to 50%, the replacement amount of the desulfurization agent replacement groove is increased according to a third preset value.
The preset number can be 10, and the third preset value can be 1% -2% of the standard desulfurizing agent content designed in the desulfurizing unit. When the number of the desulfurization units is more than 10, and the synchronous replacement probability of the desulfurization units and the blast furnace overhaul is less than or equal to 50%, the desulfurization units and the blast furnace overhaul are used for reducing the influence on the pressure loss of the desulfurization system and the working condition of the induced draft fan from greatly fluctuating, and the simultaneous replacement of the desulfurizing agents in a plurality of desulfurization devices is avoided, but the condition of reaching the maximum utilization principle is met, so that the replacement amount of the desulfurizing agent replacement slot position is increased in a gradient manner according to a third preset value. When the desulfurization units are larger than the preset number, the replacement amount of the desulfurization agent replacement tank can be expressed as follows:
C 3 ＝C datum +(N-N 1 )*C A first preset value +(F-F 1 )C A second preset value +C Third preset value ；
Wherein C is 3 C, replacing the tank position with the desulfurizing agent when the sulfur units are larger than the preset number Third preset value Is a third preset value. In addition, C 3 Should be less than or equal to C Design criteria 75% -80% of (3).
The invention discloses an online replacement method for a desulfurizing agent of a flue gas purification system, which comprises the steps of obtaining SO in flue gas components in a chimney and a desulfurizing unit 2 And judging and screening desulfurization units needing to be subjected to desulfurizing agent replacement when the concentration and dust content of the flue gas components in the chimney do not meet the environmental protection requirement, sequentially and periodically replacing desulfurizing agents in single unit desulfurization devices in the flue gas environmental protection control standard, and simultaneously avoiding simultaneous replacement of desulfurizing agents in a plurality of desulfurization devices so as to reduce the influence on the pressure loss of a desulfurization system and the fluctuation of the working conditions of an induced draft fan. SO in the smoke component in the chimney 2 When the dust content is close to the environmental protection requirement, SO in the flue gas of a single desulfurization unit 2 And detecting the dust content, sorting from high to low, and replacing the desulfurizing agent on line to achieve the aim of most effectively utilizing resources, and according to different SO in the flue gas 2 And the actual production conditions such as dust content, the number of desulfurization units, synchronous replacement probability with blast furnace maintenance and the like, different replacement amounts are set, so that screening of the desulfurization units and replacement of the desulfurizing agent are completed in an on-line production state, and the replacement process of the desulfurizing agent meets the environmental protection requirement, economical efficiency and system integrity.
Fig. 4 is a schematic structural diagram of an online replacement system for a desulfurizing agent of a flue gas purification system according to an embodiment of the present invention, and fig. 5 is a schematic structural diagram of a flue gas purification system and a detection module according to an embodiment of the present invention, where the online replacement system for a desulfurizing agent of a flue gas purification system according to the present invention is used to perform the online replacement method for a desulfurizing agent of a flue gas purification system according to the above embodiment, and referring to fig. 4, the online replacement system includes a flue gas purification system 310, a detection module 320 and a replacement module 330;
referring to fig. 5, the flue gas cleaning system 310 includes a desulfurization device 311, a stack 312, and an external flue 313, the desulfurization device 311 being connected to the stack 312 through the external flue 313 for cleaning flue gas and discharging the cleaned flue gas from the stack 312; wherein the desulfurization device 311 includes a plurality of desulfurization units 3111 therein;
the detection module 320 includes a first detection module 321 and a second detection module 322, where the first detection module 321 is configured to obtain SO in the smoke component in the chimney 312 2 The second detection module 322 is configured to obtain SO in the plurality of desulfurization units 3111 2 Concentration and dust content;
the replacement module 330 is used for removing SO in the plurality of desulfurization units 3111 2 The desulfurization units 3111 having a concentration within the second threshold range are identified, and the desulfurization agents in the identified desulfurization units 3111 are replaced online.
Wherein the first detection module 321 may be a fixed flue gas online detection system, and is located in the chimney 312 to discharge SO in the flue gas from the chimney 312 2 Carrying out online detection on dust content; the second detection module 322 may be a mobile flue gas online detection system that moves the SO's in the plurality of desulfurization units 3111, respectively 2 And detecting the concentration and the dust content. The first detection module 321 detects SO in the flue gas component in the stack 312 2 When the concentration is greater than the first threshold, the second detection module 322 obtains SO in the plurality of desulfurization units 3111 2 Concentration and dust content, SO in a plurality of desulfurization units is detected 2 Desulfurization unit 3111 having a concentration within a second threshold range, substitution module 330 for SO 2 The desulfurization units 3111 having a concentration within the second threshold range are identified, the desulfurization units 3111 requiring replacement with a desulfurizing agent are determined, and the desulfurization units are identified according to SO in the desulfurization units 2 The concentration of the identified desulfurization units 3111 is ordered, and the desulfurizing agents in the desulfurization units 3111 are sequentially replaced according to the ordering, SO that the normal operation of a flue gas purification system is not affected, and the detection of SO in flue gas by an external flue gas chimney is ensured 2 And the dust content meets the environmental protection requirement, and the screening and the desulfurizing agent replacement of the desulfurizing unit are completed under the on-line production state.
The invention discloses an online replacement of a desulfurizing agent of a flue gas purification systemThe system comprises a flue gas purification system, a detection module and a replacement module, and SO in the flue gas component in a chimney in the flue gas purification system is obtained through the detection module 2 Concentration and dust content, if SO in the flue gas component 2 The concentration is larger than a first threshold value, and SO in a plurality of desulfurization units is continuously acquired through the detection module 2 Concentration and dust content, SO in a plurality of desulfurization units are treated by a replacement module 2 The desulfurization units with the concentration within the second threshold range are identified, the online replacement is carried out on the desulfurization agents in the identified desulfurization units, when the smoke components do not meet the environmental protection requirement, whether the desulfurization agents in the plurality of desulfurization units need to be replaced or not is judged, the identification is carried out on the desulfurization units needing to be replaced with the desulfurization agents, the online replacement is carried out on the desulfurization agents in the identified desulfurization units, the desulfurization agent replacement is carried out on the desulfurization units needing to be replaced with the desulfurization agents, the excessive replacement of the desulfurization agents is avoided, the screening and the desulfurization agent replacement of the desulfurization units are completed under the online production state, the purpose of effectively utilizing resources is achieved, and the replacement process of the desulfurization agents meets the environmental protection requirement, the economical efficiency and the system integrity.
Optionally, fig. 6 is a schematic diagram of a pipeline structure of a single desulfurization unit in a desulfurization apparatus according to an embodiment of the present invention, and referring to fig. 6, the desulfurization apparatus 311 further includes an air outlet pipeline system 3112, an air inlet pipeline system 3113, and a gas replacement pipeline system 3114;
the input end of the air inlet pipeline system 3113 is connected with a flue gas exhaust pipeline of the hot blast stove, and the output end of the air inlet pipeline system is connected with the desulfurization unit 3111 and is used for transmitting flue gas exhausted by the hot blast stove to the desulfurization unit 3111;
the input end of the air outlet pipeline system 3112 is connected with the desulfurization unit 3111, and the output end is connected with the external flue 313, so as to transmit the purified flue gas to the external flue 313;
the gas displacement tubing 3114 is connected to compressed air at an input and to the desulfurization unit 3111 at an output for delivering compressed air to the desulfurization unit 3111 prior to displacement of the desulfurizing agent.
Wherein the intake ductwork 3113 further includes an intake valve and a first blind plate valve for controlling the flow of flue gas into the desulfurization unit 3111Neutralization adjusts the rate at which the flue gas enters the desulfurization unit 3111. Also included in the outlet duct system 3112 are outlet valves and second blind valves for controlling the discharge of desulfurized flue gas from the desulfurization unit 3111 and for regulating the rate of discharge of flue gas from the desulfurization unit 3111. The gas displacement tubing 3114 also includes a gas displacement valve for controlling the delivery of compressed air to the desulfurization unit 3111 prior to displacement of the desulfurizing agent. Effective separation of the desulfurization unit 3111 from the flue gas cleaning 310 system can be accomplished by the inlet duct system 3113 and the outlet duct system 3112. After the desulfurization unit 3111 is separated from the flue gas purification system 310, compressed air is connected to the flue gas purification system 310 through a gas replacement pipe system 3114, and the compressed air is introduced into the desulfurization unit 3111 to remove residual CO and SO remaining in the desulfurization unit 3111 2 And the like, and the gas replacement flow rate may be 80% to 90% of the normal flue gas passing flow rate in the desulfurization unit 3111 in order to ensure that the replacement gas does not damage the desulfurization agent reused in the upper portion. After the gas in the desulfurization unit is replaced through the gas outlet pipeline system 3112, the gas inlet pipeline system 3113 and the gas replacement pipeline system 3114, the desulfurizing agent is replaced, residual gas in the desulfurization unit 3111 is ensured not to damage the replaced desulfurizing agent, after the desulfurizing agent is replaced, the gas inlet pipeline system 3113 and the gas outlet pipeline system 3112 open a gas inlet valve, a first blind plate valve, a gas outlet valve and a second blind plate valve, the gas replacement pipeline system 3114 closes the gas replacement valve, the desulfurization unit 3111 is communicated with the flue gas purification system 310, and the desulfurization unit 3111 is restored to normal use.
Optionally, the displacement module 330 includes a desulfurizing agent displacement tank 331, a charging system 332, and a discharging system 333;
the desulfurizing agent replacement tank 331 is located in the desulfurizing unit 3111 and is used for online replacement of the desulfurizing agent in the desulfurizing unit 3111;
the charging system 332 is located above the desulfurization unit 3111 for adding a desulfurizing agent to the desulfurization unit 3111;
a discharging system 333 is located below the desulfurization unit 3111 for discharging the desulfurization agent in the desulfurization unit 3111, thereby completing replacement of the desulfurization agent.
Wherein the feed system 332 is further configured to discharge a displacement gas when the gas displacement conduit system 3114 displaces residual gas remaining in the desulfurization unit 3111. After determining the replacement amount of the desulfurizing agent replacement tank 331, the replacement module 330 performs online replacement on the desulfurizing agent in the desulfurizing unit 3111 through the desulfurizing agent replacement tank 331, adds a new desulfurizing agent through the feeding system 332, and discharges the replaced desulfurizing agent through the discharging system 333, thereby completing the desulfurizing agent replacement process.
Specifically, in the online replacement process of the desulfurizing agent of the desulfurizing unit, the following procedure can be included:
(1) After 30 seconds, the air inlet valve of the air inlet pipe system 3113 is closed, the air outlet valve of the air outlet pipe system 3112 is closed, after 30 seconds, the first blind plate valve behind the air inlet valve of the air inlet pipe system 3113 is closed, the second blind plate valve behind the air outlet valve of the air outlet pipe system 3112 is closed, and the desulfurization unit 3111 is effectively blocked from the flue gas cleaning system 310.
(2) The charging system 332 is opened, the gas replacement valve of the gas replacement pipe system 3114 is opened, compressed air is introduced into the desulfurization unit 3111, and residual CO and the like remaining in the desulfurization unit 3111 are subjected to gas replacement, and the replacement gas is discharged through the charging system 332 until the gas detection in the desulfurization unit 3111 is acceptable. To ensure that the replacement gas does not destroy the upper recycled desulfurizing agent, the gas replacement flow rate may be 80% to 90% of the normal flue gas passing flow rate in the desulfurization unit 3111.
(3) After determining the replacement amount of the desulfurizing agent replacement tank 331, the replacement module 330 performs online replacement on the desulfurizing agent in the desulfurizing unit 3111 through the desulfurizing agent replacement tank 331, adds new desulfurizing agent through the feeding system 332, discharges the replaced desulfurizing agent through the discharging system 333, completes the replacing process of the desulfurizing agent, closes the feeding system 332, opens the air inlet valve, the first blind plate valve, the air outlet valve and the second blind plate valve through the air inlet pipe system 3113 and the air outlet pipe system 3112, closes the gas replacement valve through the gas replacement pipe system 3114, communicates the desulfurizing unit 3111 with the flue gas purifying system 310, and returns the desulfurizing unit 3111 to normal use.
The invention discloses an online replacement system for a desulfurizing agent of a flue gas purification system, which passes through a detection dieSO in the smoke component in the chimney in the smoke purifying system is obtained by the block 2 Concentration and dust content, if SO in the flue gas component 2 The concentration is larger than a first threshold value, and SO in a plurality of desulfurization units is continuously acquired through the detection module 2 Concentration and dust content, SO in a plurality of desulfurization units are treated by a replacement module 2 Identifying desulfurization units with the concentration within a second threshold range, and carrying out online replacement on the desulfurizing agent in the identified desulfurization units to realize SO in smoke components in a chimney 2 When the dust content is close to the environmental protection requirement, SO in the flue gas of a single desulfurization unit 2 And detecting the dust content, sorting from high to low, and replacing the desulfurizing agent on line to achieve the aim of most effectively utilizing resources, and according to different SO in the flue gas 2 And the actual production conditions such as dust content, the number of desulfurization units, synchronous replacement probability with blast furnace maintenance and the like, different replacement amounts are set, so that screening of the desulfurization units and replacement of the desulfurizing agent are completed in an on-line production state, and the replacement process of the desulfurizing agent meets the environmental protection requirement, economical efficiency and system integrity.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (10)
1. An online replacement method for a desulfurizing agent of a flue gas purification system is characterized by comprising the following steps:
obtaining SO in smoke components in chimney 2 Concentration and dust content;
if SO in the smoke component 2 The concentration is larger than a first threshold value, and the plurality of desulfurization units are obtainedSO 2 Concentration and dust content;
for SO in the plurality of desulfurization units 2 Identifying desulfurization units with the concentration within a second threshold range;
and carrying out online replacement on the identified desulfurizing agent in the desulfurizing unit.
2. The online replacement method for a desulfurizing agent in a flue gas cleaning system according to claim 1, wherein the online replacement of the desulfurizing agent in the identified desulfurizing unit comprises:
SO for the identified desulfurization unit 2 Sequencing the concentration from high to low;
and sequentially replacing the desulfurizing agent of the desulfurizing units according to the sequencing.
3. The online replacement method for a desulfurizing agent in a flue gas cleaning system according to claim 1, wherein the online replacement of the desulfurizing agent in the identified desulfurizing unit comprises:
carrying out online replacement on the desulfurizing agent through a desulfurizing agent replacement groove position in the desulfurizing unit; and the replacement amount of the desulfurizing agent replacement groove position is used for replacing the desulfurizing agent in the desulfurizing unit according to a preset replacement standard.
4. The online replacement method for a desulfurizing agent in a flue gas purification system according to claim 3, wherein the online replacement of the desulfurizing agent in the identified desulfurizing unit further comprises:
if SO is contained in the smoke component 2 And if the concentration is greater than 1% of the first threshold value, increasing the replacement amount of the desulfurizing agent replacement tank according to a first preset value on the basis of the preset replacement standard.
5. The online replacement method for a desulfurizing agent in a flue gas purification system according to claim 3, wherein the online replacement of the desulfurizing agent in the identified desulfurizing unit further comprises:
if the dust content in the desulfurization unit is larger than the first preset dust content, the replacement amount of the desulfurizing agent replacement tank is increased according to a second preset value.
6. The online replacement method for a desulfurizing agent in a flue gas purification system according to claim 3, wherein the online replacement of the desulfurizing agent in the identified desulfurizing unit further comprises:
if the number of the desulfurization units is greater than the preset number, and the synchronous replacement probability of the desulfurization units and the blast furnace maintenance is less than or equal to 50%, the replacement amount of the desulfurizing agent replacement groove is increased according to a third preset value.
7. The online replacement method for a desulfurizing agent in a flue gas purification system according to claim 1, wherein the online replacement of the desulfurizing agent in the identified desulfurizing unit comprises:
isolating the identified desulfurization unit from a flue gas purification system;
compressed air is introduced into the identified desulfurization unit, and the gas in the identified desulfurization unit is replaced until the gas in the identified desulfurization unit is detected to be qualified;
and carrying out online replacement of the desulfurizing agent on the identified desulfurizing unit, and re-communicating the identified desulfurizing unit with the flue gas purifying system.
8. An online replacement system for a desulfurizing agent of a flue gas purification system, which is characterized by being used for executing the online replacement method for the desulfurizing agent of the flue gas purification system according to any one of claims 1 to 7, wherein the online replacement system comprises the flue gas purification system, a detection module and a replacement module;
the flue gas purification system comprises a desulfurization device, a chimney and an external flue, wherein the desulfurization device is connected with the chimney through the external flue and is used for purifying flue gas and discharging the purified flue gas from the chimney; wherein the desulfurization device comprises a plurality of desulfurization units;
the detection module packageThe system comprises a first detection module and a second detection module, wherein the first detection module is used for acquiring SO in smoke components in the chimney 2 The second detection module is used for acquiring SO in the plurality of desulfurization units 2 Concentration and dust content;
the replacement module is used for replacing SO in the plurality of desulfurization units 2 Identifying the desulfurization units with the concentration within the second threshold range, and carrying out online replacement on the desulfurizing agent in the identified desulfurization units.
9. The flue gas cleaning system desulfurization agent on-line replacement system according to claim 8, wherein the desulfurization device further comprises an outlet gas piping system, an inlet gas piping system, and a gas replacement piping system;
the input end of the air inlet pipeline system is connected with a hot blast stove smoke exhaust pipeline, and the output end of the air inlet pipeline system is connected with the desulfurization unit and is used for transmitting smoke exhausted by the hot blast stove to the desulfurization unit;
the input end of the air outlet pipeline system is connected with the desulfurization unit, and the output end of the air outlet pipeline system is connected with the external flue and is used for transmitting purified flue gas to the external flue;
the input end of the gas replacement pipeline system is connected with compressed air, and the output end of the gas replacement pipeline system is connected with the desulfurization unit and is used for transmitting the compressed air to the desulfurization unit before replacing the desulfurizing agent.
10. The flue gas cleaning system desulfurization agent on-line replacement system according to claim 8, wherein the replacement module comprises a desulfurization agent replacement tank, a charging system and a discharging system;
the desulfurizing agent replacement tank is positioned in the desulfurizing unit and is used for carrying out online replacement on the desulfurizing agent in the desulfurizing unit;
the feeding system is positioned above the desulfurization unit and is used for adding a desulfurizing agent into the desulfurization unit;
the discharging system is positioned below the desulfurization unit and is used for discharging the desulfurizing agent in the desulfurization unit so as to complete the replacement of the desulfurizing agent.
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