CN112807986A - Coke oven dust removal ground station flue gas desulfurization system and method - Google Patents
Coke oven dust removal ground station flue gas desulfurization system and method Download PDFInfo
- Publication number
- CN112807986A CN112807986A CN202110203537.8A CN202110203537A CN112807986A CN 112807986 A CN112807986 A CN 112807986A CN 202110203537 A CN202110203537 A CN 202110203537A CN 112807986 A CN112807986 A CN 112807986A
- Authority
- CN
- China
- Prior art keywords
- flue gas
- temperature
- desulfurizer
- dust removal
- coke oven
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
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
- B01D2251/00—Reactants
- B01D2251/30—Alkali metal compounds
- B01D2251/304—Alkali metal compounds of sodium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/606—Carbonates
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a flue gas desulfurization system and a flue gas desulfurization method for a coke oven dust removal ground station, which comprise a main flue gas pipeline, a low-temperature flue gas pipeline, a fan, a heating device, a Z-shaped feeder, a desulfurizer storage hopper, a grading mill and a wear-resistant conveying fan; wherein the main flue gas pipeline contains SO2The main pipe of (1); it is heated by gas taking, air supplying and heating devices, fed, ground and conveyed, and finally mixed and predecomposed to remove SO from flue gas2The purpose is to; the invention adopts the advanced heating desulfurizer NaHCO3Fine powder, the air quantity and the temperature are simply and conveniently controlled, and the abrasion to a centrifugal fan is reduced; compared with the method that the temperature of all the flue gas of the coke oven dust removal ground station is increased by additionally burning the substances such as coal gas and the like due to insufficient flue gas temperature of the coke oven dust removal ground station3The fine powder is decomposed to generate activity, the gas flow required to be heated is greatly reduced, the energy consumption is reduced, the efficiency is improved, and the process is suitableThe utility and the economy.
Description
Technical Field
The invention relates to the technical field of flue gas desulfurization, in particular to a flue gas desulfurization system and a flue gas desulfurization method for a coke oven dust removal ground station.
Background
SO2Is the main component polluting the atmospheric environment and is composed of SO2The problems of acid rain, industrial smoke and the like caused by excessive discharge seriously threaten the ecological system and the human health, and restrict the development of the society, so that the state has a strict discharge standard, and enterprises also increase the investment on the flue gas desulfurization treatment.
The sodium-based dry desulfurization process is NaHCO3As a desulfurizing agent, NaHCO is added3Spraying the fine powder (mainly with 500-800 meshes) into high-temperature flue gas, mixing a desulfurizing agent with the flue gas, and adding NaHCO into the flue gas according to the temperature of the flue gas3The fine powder (mainly 500-800 meshes) is rapidly decomposed to generate Na2CO3Granules by Na2CO3And SO2Is reacted with SO2Curing to reduce SO emissions into the atmosphere2The content of (a). However, the process requires the temperature of the flue gas to be ensured to be more than 170 ℃ so as to ensure NaHCO3The activity after decomposition (mainly 500-800 meshes) is high enough to solidify SO2Otherwise, NaHCO3Fine powder (mainly 800 mesh) cannot be decomposed completely, and the decomposed part has low activity to remove SO2Is inefficient and results in NaHCO3Is wasted. Therefore, the engineering application scenario of the sodium-based dry desulfurization process is limited: only high-temperature flue gas can be treated, and for low-temperature flue gas, the mixed flue gas is heated by frequently combusting blast furnace gas and the like, so that the desulfurizing agent is completely decomposed and then has the function, the overall energy consumption of the system is improved, the operating cost of the system is increased, and the economy of the dry desulfurization process is reduced.
Disclosure of Invention
The invention aims to provide a flue gas desulfurization system and a flue gas desulfurization method for a coke oven dust removal ground station, which are simple and convenient in air volume control and temperature control, beneficial to control and operation of an engineering field, capable of reducing the abrasion of a fan, reducing the flow of gas to be heated, reducing the energy consumption, and improving the desulfurization efficiency and the applicability and the economical efficiency of the process so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a flue gas desulfurization system of a coke oven dust removal ground station comprises a main flue gas pipeline of the coke oven dust removal ground station, a low-temperature flue gas pipeline, a fan, a heating device, a Z-shaped feeder, a desulfurizer storage hopper, a grading mill and a wear-resistant conveying fan, wherein the rear end of the main flue gas pipeline of the coke oven dust removal ground station is sequentially connected with a desulfurization tower and a bag-type dust remover; the low-temperature flue gas pipeline is connected with a low-temperature flue gas outlet on a main flue gas pipeline of the coke oven dust removal ground station or directly connected with a low-temperature outdoor air inlet; a fan is arranged at one end of the low-temperature flue gas pipeline close to the low-temperature outdoor air inlet; a heating device is also installed in the low-temperature flue gas pipeline, and a heating pipe section of the heating device is respectively connected with the low-temperature flue gas pipeline and the high-temperature flue gas pipeline through flanges; the middle part of the high-temperature flue gas pipeline is connected with a desulfurizer conveying pipeline, and a wear-resistant conveying fan, a grading mill, a desulfurizer storage hopper and a Z-shaped feeder are sequentially arranged on the desulfurizer conveying pipeline; and the outlet section of the high-temperature flue gas pipeline is provided with a desulfurizer mixing and homogenizing device and is connected with a return gas port of the high-temperature flue gas pipeline on a main flue gas pipeline of the coke oven dust removal ground station through the desulfurizer mixing and homogenizing device.
The invention provides another technical scheme: a desulfurization method of a flue gas desulfurization system of a coke oven dust removal ground station comprises the following steps:
s101: the main flue gas pipeline of the coke oven dust removal ground station is a main pipeline containing SO2 flue gas;
s102: gas taking and air supplying: extracting ambient air through a low-temperature outdoor air inlet or extracting a small amount of low-temperature flue gas of the coke oven dust removal ground station through a low-temperature flue gas outlet by a fan, and conveying the low-temperature flue gas to a subsequent system;
s103: the heating device heats the environmental air or a small amount of low-temperature flue gas of the coke oven dust removal ground station, which is conveyed by the fan, and the low-temperature gas is heated to become high-temperature gas after being mixed;
s104: feeding: conveying a raw material of the desulfurizer into a desulfurizer storage hopper through a Z-shaped feeder;
s105: grinding and conveying: the raw material of the desulfurizer is uniformly conveyed into a grading mill by a screw conveyor, the raw material of the desulfurizer with large particle size is ground into desulfurizer powder with high mesh number in the grading mill, and then the desulfurizer powder is conveyed into a high-temperature flue gas pipeline by a wear-resistant conveying fan 15;
s106: mixing and pre-decomposing, namely mixing the high-temperature gas formed by heating in S103 with desulfurizer powder sprayed into a high-temperature flue gas pipeline, wherein the desulfurizer generates a popcorn type decomposition effect after reaching a certain temperature, enters a main flue gas pipeline of a coke oven dust removal ground station along with airflow to be mixed with low-temperature flue gas of the coke oven dust removal ground station, and then sequentially enters a desulfurizing tower and a bag-type dust remover to remove SO2 and remove dust.
Furthermore, the fan is arranged in a front-mounted manner, and the low-temperature gas medium extracted by the fan is a small amount of low-temperature outdoor air or smoke in a main smoke pipeline of the coke oven dust removal ground station.
Furthermore, the heating device can select a gas heater or a combined heating mode of a steam heater and an electric heater for different energy media, the gas heater is a pipeline insertion type combustor, the gas heater is separated from the low-temperature flue gas pipeline through an air mixing inner cylinder, an air distribution ring is arranged between the air mixing inner cylinder and the high-temperature flue gas pipeline, temperature and pressure measuring points are arranged in a combustion chamber of the air mixing inner cylinder, and temperature and pressure measuring points are arranged in the high-temperature flue gas pipeline; the electric heater is composed of a plurality of heating units, and the plurality of heating units are distributed in the high-temperature flue gas pipeline.
Furthermore, the Z-shaped feeder is used for feeding the raw material of the desulfurizer into a desulfurizer storage hopper, a material level display switch is mounted on the desulfurizer storage hopper, and a gate valve is arranged at the bottom of the desulfurizer storage hopper.
Furthermore, the classifying mill consists of a grinding chamber and a classifying chamber, and can automatically screen target desulfurizer powder with-mesh number.
Furthermore, the wear-resistant conveying fan is connected with the high-temperature flue gas pipeline through a desulfurizer conveying pipeline by a flange.
Furthermore, the desulfurizer mixing and homogenizing device is arranged in the high-temperature flue gas pipeline, and the desulfurizer powder is pre-decomposed after contacting with high-temperature gas in the high-temperature flue gas pipeline.
Further, the popcorn decomposition effect in the pre-decomposition of S106 refers to NaHCO as a desulfurizing agent3The fine powder is decomposed by heating to generate Na2CO3Particles, H2O and CO2In which Na2CO3The particles react with the low-temperature SO 2-containing flue gas of the coke oven dust removal ground station in the main flue gas pipeline of the coke oven dust removal ground station.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a flue gas desulfurization system and a flue gas desulfurization method for a coke oven dust removal ground station, which are characterized in that NaHCO serving as a desulfurizing agent is heated in advance3Decomposing the fine powder to activate the activity to produce Na2CO3Granulating, introducing into flue, mixing with flue gas, and adding Na2CO3Particles and SO2Reaction is carried out to remove SO from the flue gas2The purpose is to; it adopts NaHCO which is heated in advance as desulfurizing agent3The air quantity to be processed is reduced due to the fine powder, and the air quantity control and the temperature control are simple and convenient; the control and operation of the engineering site are facilitated, and the abrasion to the centrifugal fan is reduced; compared with the method that the temperature of all the flue gas of the coke oven dust removal ground station is increased by additionally burning the substances such as coal gas and the like due to insufficient flue gas temperature of the coke oven dust removal ground station3The fine powder is decomposed to generate activity, so that the gas flow required to be heated is greatly reduced, the energy consumption is reduced, and the efficiency and the applicability and the economical efficiency of the process are improved.
Drawings
FIG. 1 is a flow chart of the desulfurization of flue gas from a ground station for extracting a small amount of low-temperature coke oven dust removal according to the present invention;
FIG. 2 is a flow diagram of the desulfurization process for extracting ambient air in accordance with the present invention;
FIG. 3 is a schematic diagram of the operation of the flue gas desulfurization system of the coke oven dust removal ground station according to the embodiment of the present invention;
FIG. 4 is a schematic diagram of the operation of the flue gas desulfurization system of the coke oven dust removal ground station according to the second embodiment of the present invention;
FIG. 5 is a schematic diagram of the operation of the flue gas desulfurization system of the coke oven dust removal ground station in the third embodiment of the present invention;
FIG. 6 is a schematic diagram of the flue gas desulfurization system of the coke oven dust removal ground station in the fourth embodiment of the present invention.
In the figure: 1. a main flue gas pipeline of the coke oven dust removal ground station; 2. a low temperature flue gas duct; 3. an air mixing inner cylinder; 4. a wind distribution ring; 5. a high temperature flue gas duct; 6. a desulfurizer conveying pipeline; 7. a desulfurizer mixing and homogenizing device; 8. a desulfurizing tower; 9. a bag-type dust collector; 10. a fan; 11. a heating device; 12. a Z-shaped feeder; 13. a desulfurizer storage hopper; 14. grading and grinding; 15. a wear-resistant conveying fan; 16. a low-temperature flue gas outlet; 17. a low temperature outdoor air inlet; 18. a high-temperature flue gas pipeline return air port; 19. a steam heater; 20. an electric heater.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, an embodiment of the present invention provides a desulfurization method for a flue gas desulfurization system of a coke oven dust removal ground station, including the following steps:
the method comprises the following steps: the main flue gas pipeline 1 of the coke oven dust removal ground station contains SO2A main pipeline of flue gas;
step two: gas taking and air supplying: ambient air is extracted by a fan 10 through a low-temperature outdoor air inlet 17 or a small amount of low-temperature flue gas of a coke oven dust removal ground station is extracted through a low-temperature flue gas outlet 16 and is conveyed to a subsequent system;
step three: the heating device 11 heats the ambient air or a small amount of low-temperature flue gas of the coke oven dust removal ground station, which is conveyed by the fan 10, and the low-temperature gas is heated to become high-temperature gas after being mixed;
step four: feeding: conveying a raw material of the desulfurizer into a desulfurizer storage hopper 13 through a Z-shaped feeder 12;
step five: grinding and conveying: the raw material of the desulfurizer is uniformly conveyed into a grading mill 14 through a screw conveyor, the raw material of the desulfurizer with large particle size is ground into desulfurizer powder with high mesh number in the grading mill 14, and then the desulfurizer powder is conveyed into a high-temperature flue gas pipeline 5 through a wear-resistant conveying fan 15;
step six: mixing and pre-decomposing, mixing the high-temperature gas formed by heating in the step three with the desulfurizer powder sprayed into the high-temperature flue gas pipeline 5, wherein the desulfurizer generates a popcorn type decomposition effect after reaching a certain temperature, and the popcorn type decomposition effect refers to NaHCO serving as the desulfurizer3The fine powder is decomposed by heating to generate Na2CO3Particles, H2O and CO2In which Na2CO3The particles react with the low-temperature SO 2-containing flue gas of the coke oven dust removal ground station in the main flue gas pipeline 1 of the coke oven dust removal ground station, enter the main flue gas pipeline 1 of the coke oven dust removal ground station along with the air flow to be mixed with the low-temperature flue gas of the coke oven dust removal ground station, and then enter the desulfurizing tower 8 and the bag-type dust remover 9 in sequence, if the reaction time is enough, the reaction can be carried out in the main flue gas pipeline 1 of the coke oven dust removal ground station without the desulfurizing tower 8, and meanwhile, a desulfurizing agent is attached to the bag-type dust remover 9 to continuously complete the desulfurizing reaction and solidify SO.
Referring to fig. 3-6, the embodiment of the invention provides a flue gas desulfurization system for a coke oven dust removal ground station, which comprises a main flue gas pipeline 1 of the coke oven dust removal ground station, a low-temperature flue gas pipeline 2, a fan 10, a heating device 11, a Z-shaped feeder 12, a desulfurizer storage hopper 13, a grading mill 14 and a wear-resistant conveying fan 15, wherein the rear end of the main flue gas pipeline 1 of the coke oven dust removal ground station is sequentially connected with a desulfurizing tower 8 and a bag-type dust remover 9; the low-temperature flue gas pipeline 2 is connected with a low-temperature flue gas outlet 16 on the main flue gas pipeline 1 of the coke oven dust removal ground station or directly connected with a low-temperature outdoor air inlet 17; a fan 10 is arranged at one end of the low-temperature flue gas pipeline 2 close to a low-temperature outdoor air inlet 17; a heating device 11 is also arranged in the low-temperature flue gas pipeline 2, and the heating pipe section of the heating device 11 is respectively connected with the low-temperature flue gas pipeline 2 and the high-temperature flue gas pipeline 5 through flanges; the middle part of the high-temperature flue gas pipeline 5 is connected with a desulfurizer conveying pipeline 6, and a wear-resistant conveying fan 15, a grading mill 14, a desulfurizer storage hopper 13 and a Z-shaped feeder 12 are sequentially arranged on the desulfurizer conveying pipeline 6; the outlet section of the high-temperature flue gas pipeline 5 is provided with a desulfurizer mixing and homogenizing device 7 and is connected with a high-temperature flue gas pipeline return air port 18 on the main flue gas pipeline 1 of the coke oven dust removal ground station through the desulfurizer mixing and homogenizing device 7.
In the above embodiment, the heating device 11 may be a gas heater or a combination of a steam heater 19 and an electric heater 20 for different energy mediums, and the different heating methods may solve the limitation of the energy medium requirement:
1) natural gas, coke oven gas and blast furnace gas can be selected as operation fuels for the gas heater, the gas heater is integrally arranged in an insertion mode, the low-temperature flue gas pipelines 2 are isolated by the air mixing inner cylinder, the combustion of the gas heater is not interfered, the operation is stable, meanwhile, the air distribution ring 4 is additionally arranged between the air mixing inner cylinder 3 and the high-temperature flue gas pipeline 5, the mixed flow field of the low-temperature gas and the high-temperature flue gas generated by the combustion of the gas heater is optimized, and the desulfurizer mixing and homogenizing device 7 is additionally arranged at the outlet of the combustion system.
2) The combined heating mode of the steam heater 19 and the electric heater 20 can select saturated steam, superheated steam and electric energy as energy media, wherein the electric heater 20 can also be composed of a plurality of heating units which are distributed in the high-temperature flue gas pipeline 5.
Referring to fig. 3-6, the raw material with low mesh number is selected as the desulfurizer, the raw material is conveyed into a desulfurizer storage hopper 13 above a grading mill 14 by a Z-shaped feeder 12, a material level display switch is arranged on the desulfurizer storage hopper 13 to accurately reflect the storage condition in the hopper, a gate valve is arranged at the bottom of the desulfurizer storage hopper 13 to block the material connection between the desulfurizer storage hopper 13 and the grading mill 14, a spiral conveyor of the grading mill 14 is connected with the desulfurizer storage hopper 13 through a non-metal soft connection, the spiral conveyor uniformly conveys the raw material into the grading mill 14, the raw material is ground in the mill to desulfurizer powder with 800 meshes of 700 meshes and enters a grading chamber, qualified high-mesh number of desulfurization powder is screened out in the grading chamber through centrifugation, a wear-resistant conveyor 15 conveys the qualified desulfurizer powder into a high-temperature flue gas pipeline 5 through a desulfurizer conveying pipeline 6, and screening the desulfurizer powder which does not pass through the grading chamber, continuously grinding the desulfurizer powder in the grinding chamber until the grinding quality is qualified, and conveying the desulfurizer powder to the high-temperature flue gas pipeline 5 through the wear-resistant conveying fan 15.
In order to further illustrate the invention, the following specific examples are also provided:
the first embodiment is as follows:
referring to fig. 3, a flue gas desulfurization system and method for a coke oven dust removal ground station includes the following steps:
ambient air is sucked into a low-temperature flue gas pipeline 2 by a fan 10 through a low-temperature outdoor air inlet 17, a gas heater burns high-temperature flue gas with the temperature of more than 1000 ℃ at normal temperature through energy media such as burning gas, natural gas and the like in a combustion chamber of an air mixing inner cylinder 3, the high-temperature flue gas with the temperature of more than 1000 ℃ and low-temperature air conveyed by the fan 10 are mixed to 250 ℃ in an air distribution ring 4, a desulfurizer raw material conveys a desulfurizer to a desulfurizer storage hopper 13 through a Z-shaped feeder 12, the desulfurizer is uniformly fed to a grading mill 14 through a spiral conveyor of the grading mill 14 and is ground to desulfurizer powder with 700-800 meshes, the desulfurizer powder with 700-800 meshes is conveyed into a high-temperature flue gas pipeline 5 through a desulfurizer conveying pipeline 6 by a wear-resistant conveying fan 15, the desulfurizer powder with 700-800 meshes is fully contacted with the high-temperature gas at 250 ℃ and is thermally decomposed in a desulfurizer mixing and homogenizing device 7, then the mixed gas passes through a desulfurizing tower 8 and a bag-type dust remover 9, if the reaction time is enough, the desulfurizing tower 8 is not needed, the mixed gas can react in a main flue gas pipeline 1 of a coke oven dust removal ground station, and a desulfurizing agent is attached to the bag-type dust remover 9 and further reacts with SO2The desulfurization reaction is carried out, the desulfurization efficiency is improved, and the flue gas emission standard is reached.
Example two:
referring to fig. 4, a flue gas desulfurization system and method for a coke oven dust removal ground station includes the following steps:
ambient air is pumped into the low-temperature flue gas pipeline 2 by a fan 10 through a low-temperature outdoor air inlet 17, the low-temperature air is subjected to heat exchange to 130 ℃ by a steam heater 19 through a saturated steam energy medium, high-temperature gas at 130 ℃ enters an electric heater 20, and the gas at 130 ℃ is heated to 250 ℃ by an electric heating element; the raw material of the desulfurizer conveys the desulfurizer to a desulfurizer storage hopper 13 through a Z-shaped feeder 12, uniformly feeding the materials to the grading mill 14 through a screw conveyer of the grading mill 14, grinding the materials to obtain desulfurizer powder of 700-800 meshes, conveying the desulfurizer powder of 700-800 meshes into a high-temperature flue gas pipeline 5 through a desulfurizer conveying pipeline 6 by a wear-resistant conveying fan 15, in the desulfurizer mixing and homogenizing device 7, 700-800 meshes of desulfurizer powder is fully contacted with high-temperature gas at 250 ℃ and is subjected to thermal decomposition, the thermally decomposed desulfurizer and the high-temperature gas enter a main flue gas pipeline 1 of a coke oven dust removal ground station together for mixing, then the mixed gas passes through a desulfurizing tower 8 and a bag-type dust remover 9, if the reaction time is enough, the desulfurizing tower 8 is not needed, the reaction can be carried out in the main flue gas pipeline 1 of the coke oven dust removal ground station, and the desulfurizing agent is attached to the bag-type dust remover 9 and further reacts with SO.2The desulfurization reaction is carried out, the desulfurization efficiency is improved, and the flue gas emission standard is reached.
Example three:
referring to fig. 5, a flue gas desulfurization system and method for a coke oven dust removal ground station includes the following steps:
a small amount of low-temperature coke oven dust removal ground station flue gas is extracted from a low-temperature flue gas outlet 16 of a main flue gas pipeline 1 of a coke oven dust removal ground station through a fan 10 and enters a low-temperature flue gas pipeline 2, high-temperature flue gas with the normal temperature of more than 1000 ℃ is combusted in a combustion chamber of an air mixing inner cylinder 3 through energy media such as combustion gas, natural gas and the like, and the high-temperature flue gas with the temperature of more than 1000 ℃ is mixed with a small amount of low-temperature coke oven dust removal ground station flue gas conveyed by the fan 10 in an; conveying the desulfurizer raw material into a desulfurizer storage hopper 13 through a Z-shaped feeder 12, uniformly feeding the desulfurizer raw material into a grading mill 14 through a screw conveyor of the grading mill 14, grinding the material to obtain desulfurizer powder of 700-800 meshes, conveying the desulfurizer powder of 700-800 meshes into a high-temperature flue gas pipe through a desulfurizer conveying pipeline 6 by a wear-resistant conveying fan 15In the way 5, desulfurizer powder of 700-800 meshes in a desulfurizer mixing and homogenizing device 7 is fully contacted with high-temperature gas at 250 ℃ and is subjected to thermal decomposition, the thermally decomposed desulfurizer and the high-temperature gas enter the main flue gas pipeline 1 of the coke oven dust removal ground station together to be mixed, then the mixed gas passes through a desulfurizing tower 8 and a bag-type dust remover 9, if the reaction time is enough, the desulfurizing tower 8 is not needed, the reaction can be carried out in the main flue gas pipeline 1 of the coke oven dust removal ground station, the desulfurizer is attached to the bag-type dust remover 9 and further reacts with SO2The desulfurization reaction is carried out, the desulfurization efficiency is improved, and the flue gas emission standard is reached.
Example four:
referring to fig. 6, a flue gas desulfurization system and method for a coke oven dust removal ground station includes the following steps:
a small amount of low-temperature coke oven dust removal ground station flue gas is extracted from a low-temperature flue gas outlet 16 of a main flue gas pipeline 1 of a coke oven dust removal ground station through a fan 10 and enters a low-temperature flue gas pipeline 2, a steam heater 19 exchanges heat with the small amount of low-temperature flue gas of the coke oven dust removal ground station to 130 ℃ through a saturated steam energy medium, high-temperature gas at 130 ℃ enters an electric heater 20, and the gas at 130 ℃ is heated to 250 ℃ through an electric heating element; the raw material of the desulfurizer conveys the desulfurizer to a desulfurizer storage hopper 13 through a Z-shaped feeder 12, uniformly feeding the materials to the grading mill 14 through a screw conveyer of the grading mill 14, grinding the materials to obtain desulfurizer powder of 700-800 meshes, conveying the desulfurizer powder of 700-800 meshes into a high-temperature flue gas pipeline 5 through a desulfurizer conveying pipeline 6 by a wear-resistant conveying fan 15, in the desulfurizer mixing and homogenizing device 7, 700-800 meshes of desulfurizer powder is fully contacted with high-temperature gas at 250 ℃ and is subjected to thermal decomposition, the thermally decomposed desulfurizer and the high-temperature gas enter a main flue gas pipeline 1 of a coke oven dust removal ground station together for mixing, then the mixed gas passes through a desulfurizing tower 8 and a bag-type dust remover 9, if the reaction time is enough, the desulfurizing tower 8 is not needed, the reaction can be carried out in the main flue gas pipeline 1 of the coke oven dust removal ground station, and the desulfurizing agent is attached to the bag-type dust remover 9 and further reacts with SO.2The desulfurization reaction is carried out, the desulfurization efficiency is improved, and the flue gas emission standard is reached.
In the first to fourth embodiments, the gas burner is used as the heating device 11 alone, or the steam heater 19 and the electric heater 20 are combined to be used as the heating device 11, so as to preheat the flue gas or the low-temperature outdoor air accounting for 0% -20% of the total dust removal ground station of the coke oven, as shown in the following table:
from the above table, it can be seen that: wherein, the fourth way of the third embodiment and the fourth embodiment heats a small amount of flue gas of the coke oven dust removal ground station through the heating device 11, the temperature of the small amount of flue gas of the coke oven dust removal ground station reaches 250 ℃, and then the desulfurizer is pre-decomposed by utilizing high-temperature hot flue gas; in the first embodiment and the second embodiment, the low-temperature outdoor air is heated by the heating device 11 to reach 250 ℃, and then the high-temperature hot air is used for pre-decomposing the desulfurizer.
In summary, the following steps: the invention provides a flue gas desulfurization system and a flue gas desulfurization method for a coke oven dust removal ground station, which are characterized in that NaHCO serving as a desulfurizing agent is heated in advance3Decomposing the fine powder to activate the activity to produce Na2CO3Granulating, introducing into flue, mixing with flue gas, and adding Na2CO3Particles and SO2Reaction is carried out to remove SO from the flue gas2The purpose is to; it adopts NaHCO which is heated in advance as desulfurizing agent3The air quantity to be processed is reduced due to the fine powder, and the air quantity control and the temperature control are simple and convenient; the control and operation of the engineering site are facilitated, and the abrasion to the centrifugal fan is reduced; compared with the method that the temperature of all the flue gas of the coke oven dust removal ground station is increased by additionally burning the substances such as coal gas and the like due to insufficient flue gas temperature of the coke oven dust removal ground station3The fine powder is decomposed to generate activity, so that the gas flow required to be heated is greatly reduced, the energy consumption is reduced, and the efficiency and the applicability and the economical efficiency of the process are improved.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. The flue gas desulfurization system for the coke oven dust removal ground station is characterized by comprising a main flue gas pipeline (1) of the coke oven dust removal ground station, a low-temperature flue gas pipeline (2), a fan (10), a heating device (11), a Z-shaped feeder (12), a desulfurizer storage hopper (13), a grading mill (14) and a wear-resistant conveying fan (15), wherein the rear end of the main flue gas pipeline (1) of the coke oven dust removal ground station is sequentially connected with a desulfurizing tower (8) and a bag-type dust remover (9); the low-temperature flue gas pipeline (2) is connected with a low-temperature flue gas outlet (16) on a main flue gas pipeline (1) of the coke oven dust removal ground station or directly connected with a low-temperature outdoor air inlet (17); a fan (10) is arranged at one end of the low-temperature flue gas pipeline (2) close to a low-temperature outdoor air inlet (17); a heating device (11) is also installed in the low-temperature flue gas pipeline (2), and the heating pipe section of the heating device (11) is respectively connected with the low-temperature flue gas pipeline (2) and the high-temperature flue gas pipeline (5) through flanges; the middle part of the high-temperature flue gas pipeline (5) is connected with a desulfurizer conveying pipeline (6), and a wear-resistant conveying fan (15), a grading mill (14), a desulfurizer storage hopper (13) and a Z-shaped feeder (12) are sequentially arranged on the desulfurizer conveying pipeline (6); and the outlet section of the high-temperature flue gas pipeline (5) is provided with a desulfurizer mixing and homogenizing device (7) and is connected with a high-temperature flue gas pipeline return air port (18) on the main flue gas pipeline (1) of the coke oven dust removal ground station through the desulfurizer mixing and homogenizing device (7).
2. The desulfurization method of the flue gas desulfurization system for the coke oven dust removal ground station of claim 1, characterized in that: the method comprises the following steps:
s101: the main flue gas pipeline (1) of the coke oven dust removal ground station contains SO2A main pipeline of flue gas;
s102: gas taking and air supplying: ambient air is extracted by a fan (10) through a low-temperature outdoor air inlet (17) or a small amount of low-temperature flue gas of a coke oven dust removal ground station is extracted through a low-temperature flue gas outlet (16) and is conveyed to a subsequent system;
s103: the heating device (11) heats the ambient air or a small amount of low-temperature flue gas of the coke oven dust removal ground station, which is conveyed by the fan (10), and the low-temperature gas is heated to become high-temperature gas after being mixed;
s104: feeding: conveying a raw material of the desulfurizer into a desulfurizer storage hopper (13) through a Z-shaped feeder (12);
s105: grinding and conveying: the raw material of the desulfurizer is evenly conveyed into a grading mill (14) through a screw conveyor, the raw material of the desulfurizer with large particle size is ground into desulfurizer powder with high mesh number in the grading mill (14), and then the desulfurizer powder is conveyed into a high-temperature flue gas pipeline (5) through a wear-resistant conveying fan (15);
s106: mixing and pre-decomposing, mixing the high-temperature gas formed by heating S103 with the desulfurizer powder sprayed into the high-temperature flue gas pipeline (5), generating a popcorn type decomposition effect after the desulfurizer reaches a certain temperature, entering the main flue gas pipeline (1) of the coke oven dust removal ground station along with the airflow to be mixed with the low-temperature flue gas of the coke oven dust removal ground station, and then sequentially entering a desulfurizing tower (8) and a bag-type dust remover (9) to carry out SO2And (4) removing and dedusting.
3. The desulfurization method of the flue gas desulfurization system of the coke oven dust removal ground station of claim 2, which is characterized in that: the fan (10) is arranged in a front-mounted mode, and low-temperature gas media extracted by the fan (10) are a small amount of low-temperature outdoor air or a small amount of smoke in a main smoke pipeline (1) of the coke oven dust removal ground station.
4. The desulfurization method of the flue gas desulfurization system of the coke oven dust removal ground station of claim 2, which is characterized in that: the heating device (11) can select a gas heater or a combined heating mode of a steam heater (19) and an electric heater (20) aiming at different energy media, the gas heater is a pipeline insertion type combustor, the gas heater is separated from the low-temperature flue gas pipeline (2) through an air mixing inner cylinder (3), an air distribution ring (4) is arranged between the air mixing inner cylinder (3) and the high-temperature flue gas pipeline (5), temperature and pressure measuring points are arranged in a combustion chamber of the air mixing inner cylinder (3), and temperature and pressure measuring points are arranged in the high-temperature flue gas pipeline (5); the electric heater (20) is composed of a plurality of heating units, and the plurality of heating units are distributed in the high-temperature flue gas pipeline (5).
5. The desulfurization method of the flue gas desulfurization system of the coke oven dust removal ground station of claim 2, which is characterized in that: the Z-shaped feeder (12) is used for feeding a raw material of the desulfurizer into the desulfurizer storage hopper (13), the desulfurizer storage hopper (13) is provided with a material level display switch, and the bottom of the desulfurizer storage hopper (13) is provided with a gate valve.
6. The desulfurization method of the flue gas desulfurization system of the coke oven dust removal ground station of claim 2, which is characterized in that: the grading mill (14) consists of a grinding chamber and a grading chamber and can automatically screen target desulfurizer powder with the mesh number of 700- & gt 800- & gt.
7. The desulfurization method of the flue gas desulfurization system of the coke oven dust removal ground station of claim 2, which is characterized in that: and the wear-resistant conveying fan (15) is connected with the high-temperature flue gas pipeline (5) through a desulfurizer conveying pipeline (6) by adopting a flange.
8. The desulfurization method of the flue gas desulfurization system of the coke oven dust removal ground station of claim 2, which is characterized in that: the desulfurizer mixing and homogenizing device (7) is arranged in the high-temperature flue gas pipeline (5), and desulfurizer powder is pre-decomposed after being contacted with high-temperature gas in the high-temperature flue gas pipeline (5).
9. The desulfurization method of the flue gas desulfurization system of the coke oven dust removal ground station of claim 2, which is characterized in that: the popcorn type decomposition effect in the pre-decomposition of S106 refers to NaHCO as a desulfurizing agent3The fine powder is decomposed by heating to generate Na2CO3Particles, H2O and CO2In which Na2CO3The particles react with the low-temperature SO 2-containing flue gas of the coke oven dust removal ground station in the main flue gas pipeline (1) of the coke oven dust removal ground station.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110203537.8A CN112807986A (en) | 2021-02-23 | 2021-02-23 | Coke oven dust removal ground station flue gas desulfurization system and method |
| CN202110618470.4A CN113351006B (en) | 2021-02-23 | 2021-06-03 | Coke oven dust removal ground station flue gas desulfurization system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110203537.8A CN112807986A (en) | 2021-02-23 | 2021-02-23 | Coke oven dust removal ground station flue gas desulfurization system and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112807986A true CN112807986A (en) | 2021-05-18 |
Family
ID=75865201
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110203537.8A Pending CN112807986A (en) | 2021-02-23 | 2021-02-23 | Coke oven dust removal ground station flue gas desulfurization system and method |
| CN202110618470.4A Active CN113351006B (en) | 2021-02-23 | 2021-06-03 | Coke oven dust removal ground station flue gas desulfurization system and method |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110618470.4A Active CN113351006B (en) | 2021-02-23 | 2021-06-03 | Coke oven dust removal ground station flue gas desulfurization system and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN112807986A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113351006A (en) * | 2021-02-23 | 2021-09-07 | 同兴环保科技股份有限公司 | Coke oven dust removal ground station flue gas desulfurization system and method |
| CN113491932A (en) * | 2021-08-04 | 2021-10-12 | 北京晨晰环保工程有限公司 | System and method for low-temperature desulfurization |
| CN115105932A (en) * | 2022-07-25 | 2022-09-27 | 湖南安普诺环保科技有限公司 | Intelligent H-SDS desulfurization and dust removal integrated equipment |
| CN115253657A (en) * | 2022-08-31 | 2022-11-01 | 上海梅山钢铁股份有限公司 | Full-combustion gas boiler flue gas desulfurization efficiency promotion control device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI20155805A (en) * | 2015-11-04 | 2017-05-05 | Amec Foster Wheeler Energia Oy | Procedure for reducing sulfur dioxide content in flue gases originating from a circulating fluidized bed boiler |
| CN112742185B (en) * | 2019-10-30 | 2023-04-07 | 中国石油化工股份有限公司 | Flue gas desulfurization reactor, flue gas treatment system and process method |
| CN112807986A (en) * | 2021-02-23 | 2021-05-18 | 同兴环保科技股份有限公司 | Coke oven dust removal ground station flue gas desulfurization system and method |
-
2021
- 2021-02-23 CN CN202110203537.8A patent/CN112807986A/en active Pending
- 2021-06-03 CN CN202110618470.4A patent/CN113351006B/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113351006A (en) * | 2021-02-23 | 2021-09-07 | 同兴环保科技股份有限公司 | Coke oven dust removal ground station flue gas desulfurization system and method |
| CN113491932A (en) * | 2021-08-04 | 2021-10-12 | 北京晨晰环保工程有限公司 | System and method for low-temperature desulfurization |
| CN115105932A (en) * | 2022-07-25 | 2022-09-27 | 湖南安普诺环保科技有限公司 | Intelligent H-SDS desulfurization and dust removal integrated equipment |
| CN115253657A (en) * | 2022-08-31 | 2022-11-01 | 上海梅山钢铁股份有限公司 | Full-combustion gas boiler flue gas desulfurization efficiency promotion control device |
| CN115253657B (en) * | 2022-08-31 | 2023-08-15 | 上海梅山钢铁股份有限公司 | Flue gas desulfurization efficiency lifting control device of full-burning gas boiler |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113351006B (en) | 2022-05-27 |
| CN113351006A (en) | 2021-09-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112807986A (en) | Coke oven dust removal ground station flue gas desulfurization system and method | |
| CN107057730B (en) | Method for co-pyrolyzing solid waste and coal | |
| CN103525502A (en) | Coal-fired power plant boiler biomass reburning denitration agent and preparation method thereof | |
| CN109797006A (en) | A kind of super fine biological matter of flue gas drying powder feeding and coal-fired coupled electricity-generation system and method | |
| CN105906223A (en) | Lime powder suspension calcining production line and suspension calcining process thereof | |
| CN110274463A (en) | A kind of pure sintering system and method based on fuel formulations and roasting control | |
| CN113351005A (en) | Low-temperature flue gas dry desulfurization process for preheating desulfurizing agent | |
| CN211688800U (en) | Flue gas recirculation coupling sludge drying on-line mixed combustion system of thermal power plant | |
| CN108587251A (en) | A kind of pelletizing of carbon black method | |
| CN207347513U (en) | A kind of device using fluid bed production charcoal | |
| CN209652250U (en) | A kind of super fine biological matter of flue gas drying powder feeding and coal-fired coupled electricity-generation system | |
| CN210399936U (en) | Clean sintering system based on fuel preparation and roasting control | |
| CN112410049A (en) | Biomass charcoal, heat and electricity cogeneration system and process thereof | |
| CN209383704U (en) | A kind of gasification of biomass coupling direct combustion power generation system | |
| CN111442639A (en) | Tail gas recycling device for transforming hot air grain dryer | |
| CN114888051B (en) | Slag treatment system and method combining microwave drying and waste heat gas recycling | |
| CN214486378U (en) | Flue gas dry desulfurization feeding device for coke oven dust removal ground station | |
| CN112705039A (en) | Coke oven coal charging and coke discharging dust removal flue gas desulfurization system | |
| CN205316299U (en) | Recoverable hot -blast furnace of flue gas | |
| CN107573959A (en) | A kind of device that charcoal is produced using fluid bed | |
| CN209655336U (en) | A kind of biologic grain and coal-fired coupled electricity-generation system | |
| CN204176667U (en) | The coal of fan mill powder process and the green electricity generation system of coal slime multifuel combustion | |
| CN107420883B (en) | A kind of carbon industry exhausted air quantity and pollutant become Zero discharging system and method | |
| CN105782958B (en) | Combustion apparatus and combustion method | |
| CN213699450U (en) | Feeding device of SDS desulfurizer for low-temperature flue gas desulfurization |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20210518 |