CN112705039A - Coke oven coal charging and coke discharging dust removal flue gas desulfurization system - Google Patents
Coke oven coal charging and coke discharging dust removal flue gas desulfurization system Download PDFInfo
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
- B01D46/023—Pockets filters, i.e. multiple bag filters mounted on a common frame
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
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- B01D2251/304—Alkali metal compounds of sodium
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2258/0283—Flue gases
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Abstract
The invention discloses a coke oven coal-charging coke-discharging dust-removing flue gas desulfurization system, wherein coke oven coal-charging coke-discharging dust-removing flue gas enters a low-temperature flue gas main pipeline; part of the low-temperature gas enters a high-temperature flue gas pipeline; heating, namely heating low-temperature gas introduced into the high-temperature flue gas pipeline; spraying a desulfurizer into the middle section of the high-temperature flue gas pipeline through the weighing feeder; mixing the high-temperature gas formed by heating with a desulfurizer, and generating a popcorn type decomposition effect after the desulfurizer reaches a certain temperature; the mixed gas of the high-temperature gas and the predecomposition desulfurizer is sent into a low-temperature flue gas main pipeline through a wear-resistant conveying fan, is mixed with coke oven coal-charging coke-discharging dust-removing flue gas in the low-temperature flue gas main pipeline, and then sequentially enters a desulfurizing tower and a bag-type dust remover. The air quantity control and the temperature control are simple and convenient, the control and the operation of an engineering field are facilitated, the abrasion to a centrifugal fan is reduced, the gas flow needing to be heated is reduced, the energy consumption is reduced, and the applicability and the economical efficiency of the efficiency and the process are improved.
Description
Technical Field
The invention relates to the technical field of desulfurization processes, in particular to a coke oven coal-charging coke-discharging dust-removing flue gas desulfurization system.
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 desulfurization system for coke oven coal-charging coke-discharging dust-removing flue gas, wherein the coke oven coal-charging coke-discharging dust-removing flue gas contains SO2The coke oven coal-charging coke-discharging dust-removing flue gas desulfurization system provided by the invention has the advantages that the air quantity control and the temperature control are simple and convenient, the control and the operation of an engineering field are facilitated, the abrasion to a centrifugal fan is reduced, the gas flow required to be heated is reduced, the energy consumption is reduced, the desulfurization efficiency is improved, and the applicability and the economical efficiency of the process are improved, so that the problems provided by the background technology are solved.
In order to achieve the purpose, the invention provides the following technical scheme: a coke oven coal charging and coke discharging dust removal flue gas desulfurization system comprises the following steps:
101: the coke oven coal charging and coke discharging dedusting flue gas enters the low-temperature flue gas main pipeline and flows from left to right along the low-temperature flue gas main pipeline;
102: taking gas, and allowing part of low-temperature gas to enter a high-temperature flue gas pipeline;
103: heating, wherein the heating device heats low-temperature gas introduced into the high-temperature flue gas pipeline to heat the low-temperature gas to become high-temperature gas;
104: feeding, wherein a desulfurizer is sprayed into the middle section part of the high-temperature flue gas pipeline through a weighing and feeding device;
105: pre-decomposition, mixing the high-temperature gas formed by heating with a desulfurizer sprayed into the high-temperature flue gas pipeline, and generating a popcorn type decomposition effect after the desulfurizer reaches a certain temperature;
106: after-treatment, the mixed gas of the high-temperature gas and the predecomposition desulfurizer is sent into a low-temperature flue gas main pipeline through a wear-resistant conveying fan, is mixed with the coke oven coal-charging coke-discharging dust-removing flue gas in the low-temperature flue gas main pipeline, and then sequentially enters a desulfurizing tower and a bag-type dust remover to carry out SO2And (4) removing and dedusting.
Further, the medium for heating the low-temperature gas in the heating process is low-temperature outdoor air or coke-discharging dust-removing flue gas in the coal-charging process of a coke oven.
Furthermore, the gas taking medium-low temperature flue gas auxiliary pipeline extracts part of coke oven coal charging coke discharging dust removal flue gas in the low temperature flue gas main pipeline, and the part of gas enters the high temperature flue gas pipeline.
Furthermore, low-temperature outdoor air is extracted from the extracted gas and enters the pipeline from the left end of the high-temperature flue gas pipeline.
Further, the heating device in heating comprises a device or a device for providing a heat source, such as a gas-gas heat exchange device, an electric heating device, a hot air heating device and the like, wherein the gas-gas heat exchange device is a steam heat exchanger, the electric heating device is an electric heater, and the hot air heating device is a hot blast stove and the like.
Further, the popcorn type decomposition effect in the pre-decomposition refers to NaHCO as a desulfurizing agent3The fine powder is decomposed by heating to generate Na2CO3Particles, H2O and CO2In which Na2CO3SO in particle and low temperature flue gas pipeline2And (4) reacting.
Furthermore, in the post-treatment, the desulfurizer, the high-temperature gas and the coke oven coal-charging coke-discharging dust-removing flue gas are mixed and then sequentially enter a desulfurizing tower and a bag-type dust remover.
Furthermore, the electric heating device in heating is composed of a plurality of heating units, and the plurality of heating units are distributed in the high-temperature flue gas pipeline.
Further, the heating unit comprises a heater, an annular air pipe, a net-shaped air pipe and a circulating air pipe, the heater is connected with the annular air pipe through the circulating air pipe, the net-shaped air pipe is arranged in the middle of the annular air pipe, and the annular air pipe and the net-shaped air pipe are communicated with each other.
Compared with the prior art, the invention has the beneficial effects that: the invention provides a coke oven coal-charging coke-discharging dust-removing flue gas desulfurization system, which heats NaHCO serving as a desulfurizing agent in advance3Decomposing the fine powder, activating the activity, and pre-decomposing to generate Na2CO3The particles are then input into a flue and mixed with low-temperature coke oven coal-charging coke-discharging dust-removing flue gas, Na2CO3Particles and SO2Reacting to achieve the aim of flue gas desulfurization; advanced heating of NaHCO as desulfurizing agent3The air quantity to be processed is reduced due to 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 coke oven is charged with coalThe temperature of the whole flue gas of coke oven coal charging, coke discharging and dust removing needs to be increased by additionally burning substances such as coal gas and the like caused by insufficient temperature of the flue gas of coke discharging and dust removing so as to ensure that NaHCO is used3The 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 a coke oven coal charging, coke discharging, dust removing and flue gas desulfurization system of the invention;
FIG. 2 is a schematic view of a coke oven coal charging, coke discharging, dust removing and flue gas desulfurization system of the present invention;
FIG. 3 is a schematic diagram of the operation of a system for removing dust and flue gas from the coal charged in a coke oven according to the embodiment of the present invention;
FIG. 4 is a structural diagram of an electric heating device of a coke oven coal-charging, coke-discharging, dust-removing and flue gas desulfurization system according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of the operation of a coke oven coal charging, coke discharging, dust removing, flue gas desulfurization system in the second embodiment of the present invention;
FIG. 6 is a schematic diagram of the operation of a coke oven coal charging, coke discharging, dust removing, flue gas desulfurization system in the third embodiment of the present invention;
FIG. 7 is a schematic diagram of the operation of a system for removing dust and flue gas from the coal charged in the coke oven according to the fourth embodiment of the present invention.
In the figure: 1. a low-temperature flue gas main pipeline; 2. a low temperature flue gas secondary pipeline; 3. a high temperature flue gas duct; 4. a heating device; 41. a gas-gas heat exchange device; 42. an electric heating device; 43. a hot air heating device; 5. a weighing feeder; 6. a wear-resistant conveying fan; 7. a desulfurizing tower; 8. a bag-type dust collector; 9. a heating unit; 91. a heater; 92. an annular air pipe; 93. a reticular trachea; 94. and circulating the air pipe.
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 and 2, a coke oven coal charging, coke discharging, dust removing and flue gas desulfurization system comprises the following steps:
101: the coke oven coal charging and coke discharging dedusting flue gas enters the low-temperature flue gas main pipeline 1 and flows from left to right along the low-temperature flue gas main pipeline 1;
102: gas taking, wherein the low-temperature smoke auxiliary pipeline 2 extracts part of the coke oven coal-charging coke-discharging dust-removing smoke in the low-temperature smoke main pipeline 1, and makes the part of the gas enter the high-temperature smoke pipeline 3, and the part of the coke oven coal-charging coke-discharging dust-removing smoke passes through the gas taking point of the coke oven coal-charging coke-discharging dust-removing smoke and sequentially passes through the low-temperature smoke main pipeline 1, the low-temperature smoke auxiliary pipeline 2, the heating device 4, the high-temperature smoke pipeline 3, the wear-resistant conveying fan 6 and the low-temperature smoke main pipeline 1, and then; or low-temperature outdoor air is extracted and enters the pipeline from the left end of the high-temperature flue gas pipeline 3, and then sequentially enters the desulfurizing tower and the dust remover after sequentially passing through the heating device 4, the high-temperature flue gas pipeline 3, the wear-resistant conveying fan 6 and the low-temperature flue gas main pipeline 1; the coke oven coal charging and coke discharging dedusting flue gas flows in the low-temperature flue gas main pipeline 1;
103: heating, namely heating low-temperature gas introduced into the high-temperature flue gas pipeline 3 by the heating device 4 to heat the low-temperature gas to become high-temperature gas;
104: feeding, wherein a desulfurizer is sprayed into the middle section part of the high-temperature flue gas pipeline 3 through a weighing feeder 5, and the desulfurizer is independently mixed with high-temperature gas;
105: pre-decomposition, mixing the high-temperature gas formed by heating with a desulfurizer sprayed into the high-temperature flue gas pipeline 3, and generating a popcorn type decomposition effect after the desulfurizer reaches a certain temperature; the decomposition effect of popcorn type refers to NaHCO as desulfurizing agent3The fine powder is decomposed by heating to generate Na2CO3Particles, H2O and CO2In which Na2CO3SO in main pipeline 1 for particles and low-temperature flue gas2Carrying out reaction;
106: and (2) post-treatment, wherein mixed gas of high-temperature gas and pre-decomposed desulfurizer is sent into the low-temperature flue gas main pipeline 1 through the wear-resistant conveying fan 6 and is mixed with coke oven coal-charging coke-discharging dust-removing flue gas in the low-temperature flue gas main pipeline 1, and the desulfurizer, the high-temperature gas and the coke oven coal-charging coke-discharging dust-removing flue gas are mixed and then sequentially enter the desulfurizing tower 7 and the bag-type dust remover 8, and if the reaction time is enough, the desulfurizing tower 7 can be omitted and the reaction can be carried out in the low-.
Referring to fig. 2-7, the heating device 4 is a gas-gas heat exchanging device 41, an electric heating device 42 or a hot air heating device 43, and other devices or devices providing heat sources, wherein the gas-gas heat exchanging device 41 is a steam heat exchanger, the electric heating device 42 is an electric heater, the hot air heating device 43 is a hot blast stove, and other devices or devices can select steam, blast furnace gas, coke oven gas, natural gas, and other devices or electricity as energy sources for heating low-temperature gas according to actual conditions, wherein the electric heating device 42 of the heating device 4 can also be composed of a plurality of heating units 9, the plurality of heating units 9 are distributed in the high-temperature flue gas pipeline 3, each heating unit 9 comprises a heater 91, an annular gas pipe 92, a mesh gas pipe 93, and a circulating gas pipe 94, the heater 91 is connected with the annular gas pipe 92 through the circulating gas pipe 94, the mesh gas pipe 93 is arranged in the middle of the annular gas pipe 92, the annular air pipe 92, the reticular air pipe 93 and the circulating air pipe 94 are filled with low-temperature outdoor air or coke oven coal-charging coke-discharging dust-removing flue gas which is a medium for heating low-temperature gas, wherein the reticular air pipe 93 is heated more uniformly, and after the low-temperature gas reaches the temperature, the subsequent heating unit 9 is not started to heat, and the subsequent heating unit 9 is continuously started to heat to save electric energy.
Example 1
Referring to fig. 3, a coke oven coal-charging coke-discharging dust-removal flue gas desulfurization system comprises the following steps that coke oven coal-charging coke-discharging dust-removal flue gas enters a low-temperature flue gas main pipeline 1 through a coke oven coal-charging coke-discharging dust-removal flue gas taking point, flows through a low-temperature flue gas auxiliary pipeline 2 and enters a heating device 4, the heating device 4 and an electric heating device 42 are cooperatively heated in the embodiment, the coke oven coal-charging coke-discharging dust-removal flue gas firstly enters the gas-gas heat exchange device 41, the gas-gas heat exchange device 41 is a steam heat exchanger, the temperature of the coke oven coal-charging coke-discharging dust-removal flue gas is heated to 130 ℃ through the steam heat exchanger,then enters an electric heating device 42, the electric heating device 42 is an electric heater, and the electric heater heats the coal charging, coke discharging and dust removing flue gas of the coke oven to 250 ℃; then 250 ℃ hot flue gas enters the middle section of the high-temperature flue gas pipeline 3 and is sprayed with 800-mesh NaHCO by the weighing feeder 53Mixing the fine powders, and pre-decomposing NaHCO3Fine powder, activating the activity of the desulfurizer before the desulfurizer enters the main low-temperature flue gas pipeline 1 and is mixed with the coke oven coal-charging coke-discharging dust-removing flue gas; the preheated high-temperature gas enters the main low-temperature flue gas pipeline 1 under the conveying of the wear-resistant conveying fan 6, is uniformly mixed with the coke oven coal-charging coke-discharging dust-removing flue gas, and then the mixed gas sequentially enters the desulfurizing tower 7 and the bag-type dust remover 8, if the reaction time is enough, the desulfurizing tower 7 can be omitted, the reaction can be carried out in the main low-temperature flue gas pipeline 1, and the desulfurizing agent and SO in the desulfurizing tower 7 or the main low-temperature flue gas pipeline 1 can react with each other2Part of the desulfurization reaction is completed, and the desulfurizing agent is attached to the cloth bag when passing through the cloth bag dust remover 8 and further reacts with SO2The desulfurization reaction is carried out, the desulfurization efficiency is improved, and the flue gas emission standard is reached.
Example 2
Referring to fig. 5, a coke oven coal charging coke discharging dust removing flue gas desulfurization system comprises the following steps that low-temperature outdoor air enters a gas-gas heat exchange device 41 through the left end of a high-temperature flue gas pipeline 3, a heating device 4 in the embodiment is the gas-gas heat exchange device 41 and an electric heating device 42 for heating in a cooperative mode, the low-temperature outdoor air firstly enters the gas-gas heat exchange device 41, the gas-gas heat exchange device 41 is a steam heat exchanger, the temperature of the outdoor air is heated to 130 ℃ through the steam heat exchanger, then the outdoor air enters the electric heating device 42, the electric heating device 42 is an electric heater, and the temperature of the air heated by the electric heater is 250 ℃; then 250 ℃ hot air enters the middle section of the high-temperature flue gas pipeline 3 and is sprayed with 800-mesh NaHCO by the weighing feeder 53Mixing the fine powders, and pre-decomposing NaHCO3Fine powder, activating the activity of the desulfurizer before the desulfurizer enters the main low-temperature flue gas pipeline 1 and is mixed with the coke oven coal-charging coke-discharging dust-removing flue gas; the preheated high-temperature gas enters the low-temperature flue gas main pipeline 1 under the conveying of the wear-resistant conveying fan 6, is uniformly mixed with the coke oven coal-charging coke-discharging dust-removing flue gas, and then the mixed gas sequentially enters the desulfurizing tower 7 and the bag-type dust remover 8, if the reaction time is enough, the mixed gas can be usedThe reaction can be carried out in the low-temperature flue gas main pipeline 1 without using the desulfurizing tower 7, and the desulfurizing agent and SO in the desulfurizing tower 7 or the low-temperature flue gas main pipeline 12Part of the desulfurization reaction is completed, and the desulfurizing agent is attached to the cloth bag when passing through the cloth bag dust remover 8 and further reacts with SO2The desulfurization reaction is carried out, the desulfurization efficiency is improved, and the flue gas emission standard is reached.
Example 3
Referring to fig. 6, a coke oven coal-charging coke-discharging dust-removal flue gas desulfurization system comprises the following steps that coke oven coal-charging coke-discharging dust-removal flue gas enters a low-temperature flue gas main pipeline 1 through a low-temperature flue gas taking point, flows through a low-temperature flue gas auxiliary pipeline 2 and enters a heating device 4, the heating device 4 is a hot air heating device 43 in the embodiment, the hot air heating device 43 is a hot air furnace and the like, the hot air furnace heats the coke oven coal-charging coke-discharging dust-removal flue gas to 250 ℃, and the combustion medium of the hot air furnace is coke oven gas/blast furnace gas; then 250 ℃ hot flue gas enters the middle section of the high-temperature flue gas pipeline 3 and is sprayed with 800-mesh NaHCO by the weighing feeder 53Mixing the fine powders, and pre-decomposing NaHCO3Fine powder, activating the activity of the desulfurizer before the desulfurizer enters the main low-temperature flue gas pipeline 1 and is mixed with the coke oven coal-charging coke-discharging dust-removing flue gas; the preheated high-temperature gas enters the main low-temperature flue gas pipeline 1 under the conveying of the wear-resistant conveying fan 6, is uniformly mixed with the coke oven coal-charging coke-discharging dust-removing flue gas, and then the mixed gas sequentially enters the desulfurizing tower 7 and the bag-type dust remover 8, if the reaction time is enough, the desulfurizing tower 7 can be omitted, the reaction can be carried out in the main low-temperature flue gas pipeline 1, and the desulfurizing agent and SO in the desulfurizing tower 7 or the main low-temperature flue gas pipeline 1 can react with each other2Part of the desulfurization reaction is completed, and the desulfurizing agent is attached to the cloth bag when passing through the cloth bag dust remover 8 and further reacts with SO2The desulfurization reaction is carried out, the desulfurization efficiency is improved, and the flue gas emission standard is reached.
Example 4
Referring to fig. 7, the coke oven coal charging, coke discharging, dust removing and flue gas desulfurization system comprises the following steps that low-temperature outdoor air enters a heating device 4 through the left end of a high-temperature flue gas pipeline 3, the heating device 4 is a hot air heating device 43 in the embodiment, the hot air heating device 43 is a hot air furnace and the like, the hot air furnace heats the low-temperature outdoor air to 250 ℃, and the hot air furnace heats the low-temperature outdoor air to 250 DEG CThe combustion medium is coke oven gas/blast furnace gas/natural gas and the like; then 250 ℃ hot air enters the middle section of the high-temperature flue gas pipeline 3 and is sprayed with 800-mesh NaHCO by the weighing feeder 53Mixing the fine powders, and pre-decomposing NaHCO3Fine powder, activating the activity of the desulfurizer before the desulfurizer enters the main low-temperature flue gas pipeline 1 and is mixed with the coke oven coal-charging coke-discharging dust-removing flue gas; the preheated high-temperature gas enters the main low-temperature flue gas pipeline 1 under the conveying of the wear-resistant conveying fan 6, is uniformly mixed with the coke oven coal-charging coke-discharging dust-removing flue gas, and then the mixed gas sequentially enters the desulfurizing tower 7 and the bag-type dust remover 8, if the reaction time is enough, the desulfurizing tower 7 can be omitted, the reaction can be carried out in the main low-temperature flue gas pipeline 1, and the desulfurizing agent and SO in the desulfurizing tower 7 or the main low-temperature flue gas pipeline 1 can react with each other2Part of the desulfurization reaction is completed, and the desulfurizing agent is attached to the cloth bag when passing through the cloth bag dust remover 8 and further reacts with SO2The 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 hot blast stove is used as the heating device 4 alone, or the steam heat exchanger and the electric heater are combined to be used as the heating device 4, and flue gas or low-temperature outdoor air accounting for 0-20% of the total coke oven coal charging, coke discharging and dust removing flue gas is preheated, as shown in the following table:
in the first embodiment and the third embodiment, the heating device 4 is used for heating the coal-charging, coke-discharging and dust-removing flue gas of the coke oven, so that the temperature of the coal-charging, coke-discharging and dust-removing flue gas of the coke oven reaches 250 ℃, and then the high-temperature hot flue gas is used for pre-decomposing the desulfurizer; in the second embodiment and the fourth embodiment, the low-temperature outdoor air is heated by the heating device 4, the temperature of the low-temperature outdoor air is up to 250 ℃, and then the high-temperature hot air is used for pre-decomposing the desulfurizer.
In summary, the following steps: the invention provides a coke oven coal charging methodThe coke-discharging dust-removing flue gas desulfurization system adopts the advanced heating of NaHCO as desulfurizing agent3Decomposing 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; advanced heating of NaHCO as desulfurizing agent3The air quantity to be processed is reduced due to 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 flue gas of the coke oven coal-charging, coke-discharging and dust-removing is increased by additionally burning the substances such as coal gas and the like caused by insufficient temperature of the flue gas of the coke oven coal-charging, coke-discharging and dust-removing, the method ensures that NaHCO is used3The 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.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.
Claims (9)
1. The coke oven coal-charging coke-discharging dust-removing flue gas desulfurization system is characterized by comprising the following steps:
101: the coke oven coal charging and coke discharging dedusting flue gas enters the low-temperature flue gas main pipeline (1) and flows from left to right along the low-temperature flue gas main pipeline (1);
102: gas is taken, and part of low-temperature gas enters a high-temperature flue gas pipeline (3);
103: heating, wherein the heating device (4) heats low-temperature gas introduced into the high-temperature flue gas pipeline (3) to heat the low-temperature gas to become high-temperature gas;
104: feeding, wherein a desulfurizer is sprayed into the middle section part of the high-temperature flue gas pipeline (3) through a weighing and feeding device (5);
105: pre-decomposition, wherein high-temperature gas formed by heating is mixed with a desulfurizer sprayed into the high-temperature flue gas pipeline (3), and the desulfurizer generates a popcorn type decomposition effect after reaching a certain temperature;
106: after-treatment, the mixed gas of the high-temperature gas and the predecomposition desulfurizer is sent into a low-temperature flue gas main pipeline (1) through a wear-resistant conveying fan (6) and is mixed with the coke oven coal-charging coke-discharging dust-removing flue gas in the low-temperature flue gas main pipeline (1), and then the mixed gas sequentially enters a desulfurizing tower (7) and a bag-type dust remover (8) to carry out SO2And (4) removing and dedusting.
2. The coke oven coal-charging coke-discharging dust-removing flue gas desulfurization system as claimed in claim 1, characterized in that: the medium for heating the low-temperature gas in the heating process is low-temperature outdoor air or coke-charging and coke-discharging dust-removing flue gas of a coke oven.
3. The coke oven coal-charging coke-discharging dust-removing flue gas desulfurization system as claimed in claim 1, characterized in that: the gas taking medium-low temperature flue gas auxiliary pipeline (2) extracts part of coke oven coal charging coke discharging dust removing flue gas in the low temperature flue gas main pipeline (1), and makes the part of gas enter the high temperature flue gas pipeline (3).
4. The coke oven coal-charging coke-discharging dust-removing flue gas desulfurization system as claimed in claim 1, characterized in that: low-temperature outdoor air is extracted from the gas taking process and enters the pipeline from the left end of the high-temperature flue gas pipeline (3).
5. The coke oven coal-charging coke-discharging dust-removing flue gas desulfurization system as claimed in claim 1, characterized in that: the heating device (4) in heating comprises a device or a device for providing a heat source for a gas-gas heat exchange device (41), an electric heating device (42) and a hot air heating device (43), wherein the gas-gas heat exchange device (41) is a steam heat exchanger, the electric heating device (42) is an electric heater, and the hot air heating device (43) is a hot air furnace.
6. The coke oven coal-charging coke-discharging dust-removing flue gas desulfurization system as claimed in claim 1, characterized in that: the popcorn type decomposition effect in the pre-decomposition refers to NaHCO as a desulfurizing agent3The fine powder is decomposed by heating to generate Na2CO3Particles, H2O and CO2In which Na2CO3SO in particle and low-temperature flue gas pipeline (1)2And (4) reacting.
7. The coke oven coal-charging coke-discharging dust-removing flue gas desulfurization system as claimed in claim 1, characterized in that: in the post-treatment, the desulfurizer, the high-temperature gas and the coke oven coal-charging coke-discharging dust-removing flue gas are mixed and then sequentially enter a desulfurizing tower (7) and a bag-type dust remover (8).
8. The coke oven coal-charging coke-discharging dust-removing flue gas desulfurization system as claimed in claim 5, characterized in that the electric heating device (42) in heating is composed of a plurality of heating units (9), and the plurality of heating units (9) are distributed in the high-temperature flue gas pipeline (3).
9. The coke oven coal-charging coke-discharging dust-removing flue gas desulfurization system of claim 8, wherein the heating unit (9) comprises a heater (91), an annular gas pipe (92), a mesh gas pipe (93) and a circulating gas pipe (94), the heater (91) is connected with the annular gas pipe (92) through the circulating gas pipe (94), the mesh gas pipe (93) is arranged in the middle of the annular gas pipe (92), and the annular gas pipe (92) and the mesh gas pipe (93) are communicated with each other.
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| CN202110006890.7A CN112705039A (en) | 2021-01-05 | 2021-01-05 | Coke oven coal charging and coke discharging dust removal flue gas desulfurization system |
| CN202110618589.1A CN114471136A (en) | 2021-01-05 | 2021-06-03 | Coke oven coal charging and coke discharging dust removal flue gas desulfurization system |
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| CN202110006890.7A CN112705039A (en) | 2021-01-05 | 2021-01-05 | Coke oven coal charging and coke discharging dust removal flue gas desulfurization system |
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| CN202110618589.1A Pending CN114471136A (en) | 2021-01-05 | 2021-06-03 | Coke oven coal charging and coke discharging dust removal flue gas desulfurization system |
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| 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 (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2041390U (en) * | 1988-07-16 | 1989-07-19 | 辽宁省阜新市轻工机电设备厂 | Fuel oil heater |
| CN102628611A (en) * | 2012-03-21 | 2012-08-08 | 童德海 | Energy-saving instantaneous electric water heater |
| CN205505504U (en) * | 2016-02-16 | 2016-08-24 | 广东益诺欧环保股份有限公司 | A novel evaporimeter for compressed air purifies |
| CN112316708A (en) * | 2020-11-17 | 2021-02-05 | 同兴环保科技股份有限公司 | Low-temperature SO-containing low-temperature preheating desulfurizer2Dry flue gas desulfurization process |
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2021
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| 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 |
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