CN111249872A - Two-section type circulating fluidized bed desulfurization system and desulfurization process - Google Patents
Two-section type circulating fluidized bed desulfurization system and desulfurization process Download PDFInfo
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- CN111249872A CN111249872A CN202010092924.4A CN202010092924A CN111249872A CN 111249872 A CN111249872 A CN 111249872A CN 202010092924 A CN202010092924 A CN 202010092924A CN 111249872 A CN111249872 A CN 111249872A
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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
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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
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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
- B01D46/04—Cleaning filters
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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
- B01D53/507—Sulfur oxides by treating the gases with other liquids
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28C—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION
- F28C3/00—Other direct-contact heat-exchange apparatus
- F28C3/06—Other direct-contact heat-exchange apparatus the heat-exchange media being a liquid and a gas or vapour
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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Abstract
The invention belongs to the field of flue gas treatment, and provides a two-section type circulating fluidized bed desulfurization system and a desulfurization process in order to solve the problems of high arrangement elevation of a desulfurization system, large and complex support structure amount and large running resistance of a desulfurization tower. The desulfurization system comprises a desulfurization tower and a desulfurizer bin; the desulfurizing tower comprises an ascending tower and a descending tower, and the top of the ascending tower is communicated with the top of the descending tower; the desulfurizing agent bin is communicated with the Venturi section connected with the bottom of the ascending tower and the top of the descending tower respectively and is used for adding a desulfurizing agent into the desulfurizing tower from the Venturi section of the ascending tower and the top of the descending tower respectively.
Description
Technical Field
The invention belongs to the field of flue gas treatment, and particularly relates to a two-section type circulating fluidized bed desulfurization system and a desulfurization process.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The semidry desulfurization process of the circulating fluidized bed is one of the main flue gas desulfurization and dust removal processes at present, and is a main way for realizing ultralow emission of flue gas. The main equipment of the process is a circulating fluidized bed desulfurization tower and a dust remover, and the working principle is that flue gas flows through a Venturi tube of the circulating fluidized bed desulfurization tower, a desulfurizing agent and externally circulating desulfurization ash are fluidized and sent into the desulfurization tower, and desulfurization semi-dry type washing reaction is carried out. And large-particle desulfurization ash in the high ash-containing flue gas flows back into the desulfurization tower at the top of the desulfurization tower to form an internal circulation mode of the desulfurization ash. The desulfurized fly ash separated from the flue gas by the dust remover after passing through the desulfurizing tower is returned to the Venturi tube of the desulfurizing tower by the conveying device of the fly ash circulating system, so that an external circulating mode of the desulfurized fly ash is formed, namely the desulfurized fly ash of the external circulating mode. The flue gas firstly enters a desulfurizing tower, is subjected to desulfurization reaction in the desulfurizing tower, and is discharged after being dedusted by a bag-type deduster.
At present, the form of a circulating fluidized bed desulfurizing tower is mostly an ascending empty tower structure, namely, the lower part of the tower is a flue gas inlet, the upper part of the tower is a flue gas outlet, the flow velocity of flue gas in the tower is generally designed to be about 5 m/s, and the retention time of the flue gas in the tower is 5-6 s. The ascending tower has the advantages that in the process that the desulfurization ash in the tower flows upwards along with the flue gas, the desulfurization ash falls back into the tower from the top part of the tower due to gravity to form internal circulation of the desulfurization ash, so that the ash concentration in the tower is increased; however, the inventor finds that the upward hollow tower structure has the defects that the reaction section of the tower body is higher, usually reaching 30 meters, so that the arrangement elevation of the whole system is increased, the support structure is large and complex, and the running resistance of the desulfurizing tower is large.
Disclosure of Invention
In order to solve the above problems, a first aspect of the present invention provides a two-stage circulating fluidized bed desulfurization system, which utilizes the advantage of high concentration of materials in an ascending tower and the advantage of high contact probability between fresh materials and sulfur dioxide in a descending tower, reduces the height of the tower and improves the overall utilization rate of the desulfurizing agent under the condition of ensuring the same residence time of flue gas.
In order to achieve the purpose, the invention adopts the following technical scheme:
a two-section type circulating fluidized bed desulfurization system comprises a desulfurization tower and a desulfurizer bin;
the desulfurizing tower comprises an ascending tower and a descending tower, and the top of the ascending tower is communicated with the top of the descending tower; the flue gas enters the ascending tower from the bottom of the ascending tower, flows upwards along the ascending tower, enters the top of the descending tower from the top of the ascending tower and is finally discharged from the bottom of the descending tower;
the desulfurizing agent bin is communicated with the top of the venturi section and the top of the descending tower of the ascending tower respectively and is used for adding a desulfurizing agent into the desulfurizing tower from the top of the venturi section and the top of the descending tower of the ascending tower respectively; the flue gas reacts with a desulfurizer in the desulfurizing tower to generate desulfurized ash, and part of the desulfurized ash carried by the flue gas reflows into the ascending tower from the top of the ascending tower due to gravity and inertia sedimentation to become internally-circulated desulfurized ash; and the other part of the desulfurized ash is discharged from the bottom of the descending tower along with the flue gas.
In one embodiment, the bottom of the downer is also connected to a dust separator.
As an embodiment, the dust remover is a bag-type dust remover.
As an implementation mode, the desulfurizing agent is discharged from the bottom of the descending tower along with the flue gas and enters the bag-type dust remover, the desulfurizing agent is captured by the bag-type dust remover, a desulfurizing ash filter cake section is formed on the surface of a filter bag, and the flue gas flowing through the bag-type dust remover is continuously desulfurized.
The filter cake has the advantages that the filter cake has a better desulfurization effect when smoke passes through due to higher content of the fresh desulfurizer, and the desulfurization effect of the whole two-section type circulating fluidized bed desulfurization system is improved.
As an implementation mode, the desulfurization ash discharged from the bottom of the descending tower along with the flue gas enters a bag-type dust remover, and the desulfurization ash is filtered by the bag-type dust remover and then is returned to the Venturi section of the ascending tower.
As an implementation mode, the position of the desulfurization ash returned to the venturi section of the ascending tower after being filtered by the bag-type dust collector is set as a first position; the position of the desulfurizer added into the Venturi section of the ascending tower is set as a second position; the first position is the same height as the second position.
As an implementation mode, an atomization device is further arranged at the bottom of the ascending tower and above the venturi section, and the atomization device is used for atomizing humidifying water so as to reduce the temperature of the flue gas.
Wherein, the position of the atomizing device is higher than the circulating material tower inlet point of the ascending tower and the position of the Venturi section of the desulfurizing agent added into the ascending tower. Therefore, the humidifying water can be quickly adsorbed to the high-concentration desulfurized fly ash in the area after being sprayed, the requirement of desulfurization reaction is ensured, and the phenomenon that the desulfurized fly ash is adhered to the wall and is hardened due to the fact that the water is sprayed to the tower wall is reduced.
In order to solve the above problems, a second aspect of the present invention provides a two-stage circulating fluidized bed desulfurization process, which utilizes the advantage of high material concentration in the ascending tower and the advantage of high contact probability between the fresh material and sulfur dioxide in the descending tower, reduces the tower height and improves the overall utilization rate of the desulfurizing agent under the condition of ensuring the same residence time of the flue gas.
In order to achieve the purpose, the invention adopts the following technical scheme:
a two-stage type circulating fluidized bed desulfurization process comprises the following steps:
adding the desulfurizer in the desulfurizer bin into the desulfurizing tower from the top of the venturi section and the top of the descending tower of the ascending tower respectively;
the flue gas enters the desulfurizing tower from the bottom of the ascending tower for a vulcanization reaction, flows upwards along the ascending tower, enters the top of the descending tower from the top of the ascending tower and is finally discharged from the bottom of the descending tower;
in the process of the vulcanization reaction, the flue gas reacts with a desulfurizer to generate desulfurized ash, and part of the desulfurized ash carried by the flue gas reflows into the ascending tower from the top of the ascending tower due to gravity and inertia sedimentation to become internally-circulated desulfurized ash; and the other part of the desulfurized ash is discharged from the bottom of the descending tower along with the flue gas.
As an implementation mode, the desulfurization ash discharged from the bottom of the descending tower along with the flue gas enters a bag-type dust remover, and is filtered by the bag-type dust remover and then returned to the Venturi section of the ascending tower.
As an implementation mode, the desulfurizing agent is discharged from the bottom of the descending tower along with the flue gas and enters the bag-type dust remover, the desulfurizing agent is captured by the bag-type dust remover, a desulfurizing ash filter cake section is formed on the surface of a filter bag, and the flue gas flowing through the bag-type dust remover is continuously desulfurized.
The invention has the beneficial effects that:
(1) the desulfurizing tower is designed in two sections, and the height of the desulfurizing tower is reduced under the condition of ensuring the same retention time of flue gas, so that the overall elevation of a desulfurizing and dedusting system is reduced, and the desulfurizing tower is favorable for a tower body structure and a civil engineering supporting structure;
(2) the desulfurizer is added into the desulfurizing tower in two stages, namely from the Venturi section of the ascending tower and the top of the descending tower, so that the overall utilization rate of the desulfurizer is improved; the principle is as follows: because the flow process of the flue gas in the desulfurizing tower is that the flue gas flows upwards along the ascending tower, enters the top of the descending tower from the top of the ascending tower and is finally discharged from the bottom of the descending tower, new desulfurizing agents are respectively added into the flue gas entering the ascending tower and the descending tower, the phenomenon that the desulfurizing agents are less and less along with the flowing of the flue gas, the whole vulcanization reaction effect is influenced can be avoided, and the overall utilization rate of the desulfurizing agents is further improved.
(3) In the ascending tower, the internal circulation characteristic of the desulfurization ash is utilized, the concentration of the desulfurization ash in the tower is high, the large turbulent contact between sulfur dioxide in the flue gas and the desulfurization ash is ensured, and the utilization rate of effective components in the circulating material is improved; wherein, the circulating material is desulfurized ash, the desulfurized ash carried by the flue gas enters the tower again after passing through the dust remover, the process is circulated repeatedly, and the part of desulfurized ash is called as circulating material;
(4) in the descending tower, because part of the desulfurization ash sinks in the ascending tower, the concentration of the desulfurization ash is lower, and part of the desulfurizing agent is supplemented from the top, so that the contact reaction of the fresh desulfurizing agent in the descending tower and sulfur dioxide in the flue gas is improved, and the desulfurization efficiency is further improved;
(5) the desulfurizing agent which is not completely reacted in the descending tower can be captured by the bag-type dust collector, and a desulfurizing ash filter cake is formed on the surface of the filter bag, so that the filter cake has a better desulfurizing effect when the flue gas passes through due to higher desulfurizing agent content;
(6) the ascending tower has high concentration of the desulfurized ash in the tower, and the resistance of the tower body is large, and the resistance of the ascending tower is reduced because the height of the ascending tower is reduced, so that the smoke resistance of the whole desulfurization and dust removal system is reduced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic structural diagram of a two-stage circulating fluidized bed desulfurization system according to an embodiment of the present invention;
fig. 2 is a typical layout of a two-stage circulating fluidized bed desulfurization system in accordance with an embodiment of the present invention.
Wherein, 1 is an ascending tower, 2 is a descending tower, 3 is a bag-type dust remover, and 4 is a desulfurizer bin.
Detailed Description
The invention is further described with reference to the following figures and examples.
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In the present invention, terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only terms of relationships determined for convenience of describing structural relationships of the parts or elements of the present invention, and are not intended to refer to any parts or elements of the present invention, and are not to be construed as limiting the present invention.
In the present invention, terms such as "fixedly connected", "connected", and the like are to be understood in a broad sense, and mean either a fixed connection or an integrally connected or detachable connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be determined according to specific situations by persons skilled in the relevant scientific or technical field, and are not to be construed as limiting the present invention.
As shown in fig. 1 and fig. 2, the two-stage circulating fluidized bed desulfurization system of the present embodiment includes a desulfurization tower and a desulfurizing agent bin; the desulfurizing tower comprises an ascending tower 1 and a descending tower 2, and the top of the ascending tower 1 is communicated with the top of the descending tower 2; the flue gas enters the ascending tower from the bottom of the ascending tower, flows upwards along the ascending tower, enters the top of the descending tower from the top of the ascending tower and is finally discharged from the bottom of the descending tower;
the desulfurizer bin 3 is respectively communicated with the venturi section connected with the bottom of the ascending tower 1 and the top of the descending tower 2 and is used for adding a desulfurizer into the desulfurizing tower from the venturi section of the ascending tower and the top of the descending tower; the flue gas reacts with a desulfurizer in the desulfurizing tower to generate desulfurized ash, and part of the desulfurized ash carried by the flue gas reflows into the ascending tower from the top of the ascending tower due to gravity and inertia sedimentation to become internally-circulated desulfurized ash; and the other part of the desulfurized ash is discharged from the bottom of the descending tower along with the flue gas.
In the embodiment, the desulfurizing tower is designed in two sections, and the height of the desulfurizing tower is reduced under the condition of ensuring the same retention time of flue gas, so that the integral elevation of a desulfurizing and dedusting system is reduced, and the desulfurizing tower is favorable for a tower body structure and a civil engineering supporting structure;
in the embodiment, the desulfurizing agent is respectively added into the desulfurizing tower from the top of the venturi section of the ascending tower and the top of the descending tower, so that the overall utilization rate of the desulfurizing agent is improved;
in the ascending tower, the internal circulation characteristic of the desulfurization ash is utilized, the concentration of the desulfurization ash in the tower is high, the large turbulent contact between sulfur dioxide in the flue gas and the desulfurization ash is ensured, and the utilization rate of effective components in the circulating material is improved;
in the descending tower, because part of the desulfurization ash sinks in the ascending tower, the concentration of the desulfurization ash is lower, and part of the desulfurizing agent is supplemented from the top, so that the contact reaction of the fresh desulfurizing agent in the descending tower and sulfur dioxide in the flue gas is improved, and the desulfurization efficiency is further improved;
as shown in fig. 1 and 2, the bottom of the downer is also connected to a dust separator. As an embodiment, the dust remover is a bag dust remover 4.
As a specific implementation mode, the desulfurizing agent is discharged from the bottom of the descending tower along with the flue gas and enters the bag-type dust remover, the desulfurizing agent is captured by the bag-type dust remover, a desulfurizing ash filter cake section is formed on the surface of a filter bag, and the flue gas flowing through the bag-type dust remover is continuously desulfurized.
The filter cake has the advantages that the filter cake has a better desulfurization effect when smoke passes through due to higher content of the fresh desulfurizer, and the desulfurization effect of the whole two-section type circulating fluidized bed desulfurization system is improved.
As an implementation mode, the desulfurization ash discharged from the bottom of the descending tower along with the flue gas enters a bag-type dust remover, and the desulfurization ash is filtered by the bag-type dust remover and then is returned to the Venturi section of the ascending tower.
Wherein, the structure of the bag-type dust collector is the existing structure, and the technical personnel in the field can specifically select the model of the bag-type dust collector according to the actual situation.
As an implementation mode, the position of the venturi section which is filtered by the bag-type dust collector and then returned to the ascending tower is set as a first position; the position of the desulfurizer added into the Venturi section of the ascending tower is set as a second position; the first position is the same height as the second position.
As an implementation mode, an atomization device is further arranged at the bottom of the ascending tower and above the venturi section, and the atomization device is used for atomizing humidifying water so as to reduce the temperature of the flue gas.
The structure of the atomization device is the existing structure, and the description is not repeated here.
Specifically, reaction humidifying water enters the desulfurization system from the lower part of the ascending tower, and the water spraying position is above the material adding point of the ascending tower. The humidifying water is added in an atomized form, and is evaporated by the flue gas after being added, or is attached to the desulfurization ash, or is reacted, the flue gas discharged out of the desulfurization tower is still dry flue gas, and the desulfurization ash is in a dry state.
Wherein, the position of the atomizing device is higher than the circulating material tower inlet point of the ascending tower and the position of the Venturi section of the desulfurizing agent added into the ascending tower. Therefore, the humidifying water can be quickly adsorbed to the high-concentration desulfurized fly ash in the area after being sprayed, the requirement of desulfurization reaction is ensured, and the phenomenon that the desulfurized fly ash is adhered to the wall and is hardened due to the fact that the water is sprayed to the tower wall is reduced.
Example two
The embodiment provides a two-stage type circulating fluidized bed desulfurization process, which comprises the following steps:
adding the desulfurizer in the desulfurizer bin into the desulfurizing tower from the top of the venturi section and the top of the descending tower of the ascending tower respectively;
the flue gas enters the desulfurizing tower from the bottom of the ascending tower for a vulcanization reaction, flows upwards along the ascending tower, enters the top of the descending tower from the top of the ascending tower and is finally discharged from the bottom of the descending tower;
in the process of the vulcanization reaction, the flue gas reacts with a desulfurizer to generate desulfurized ash, and part of the desulfurized ash carried by the flue gas reflows into the ascending tower from the top of the ascending tower due to gravity and inertia sedimentation to become internally-circulated desulfurized ash; and the other part of the desulfurized ash is discharged from the bottom of the descending tower along with the flue gas.
The embodiment utilizes the advantage of high material concentration in the ascending tower, and utilizes the advantage of high contact probability of the fresh materials and sulfur dioxide in the tower, thereby reducing the height of the tower, improving the overall utilization rate of the desulfurizer, ensuring the desulfurization efficiency and reducing the calcium-sulfur ratio under the condition of ensuring the same retention time of flue gas.
As an implementation mode, the desulfurization ash discharged from the bottom of the descending tower along with the flue gas enters a bag-type dust remover, and the desulfurization ash is filtered by the bag-type dust remover and then is returned to the Venturi section of the ascending tower.
As a specific implementation mode, the desulfurizing agent is discharged from the bottom of the descending tower along with the flue gas and enters the bag-type dust remover, the desulfurizing agent is captured by the bag-type dust remover, a desulfurizing ash filter cake section is formed on the surface of a filter bag, and the flue gas flowing through the bag-type dust remover is continuously desulfurized. Therefore, the effective material proportion of the filter cake on the surface of the bag-type dust collector is increased, the desulfurization efficiency is ensured, and the calcium-sulfur ratio is reduced.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A two-section type circulating fluidized bed desulfurization system is characterized by comprising a desulfurization tower and a desulfurizer bin;
the desulfurizing tower comprises an ascending tower and a descending tower, and the top of the ascending tower is communicated with the top of the descending tower; the flue gas enters the ascending tower from the bottom of the ascending tower, flows upwards along the ascending tower, enters the top of the descending tower from the top of the ascending tower and is finally discharged from the bottom of the descending tower;
the desulfurizing agent bin is communicated with the top of the venturi section and the top of the descending tower of the ascending tower respectively and is used for adding a desulfurizing agent into the desulfurizing tower from the top of the venturi section and the top of the descending tower of the ascending tower respectively; the flue gas reacts with a desulfurizer in the desulfurizing tower to generate desulfurized ash, and part of the desulfurized ash carried by the flue gas reflows into the ascending tower from the top of the ascending tower due to gravity and inertia sedimentation to become internally-circulated desulfurized ash; and the other part of the desulfurized ash is discharged from the bottom of the descending tower along with the flue gas.
2. The two-stage circulating fluidized bed desulfurization system according to claim 1, wherein the bottom of the lower column is further connected to a dust remover.
3. The two-stage circulating fluidized bed desulfurization system of claim 2, wherein the dust remover is a bag-type dust remover.
4. The two-stage circulating fluidized bed desulfurization system of claim 3, wherein the desulfurization ash discharged from the bottom of the lower column along with the flue gas enters the bag-type dust collector, is filtered by the bag-type dust collector, and is returned to the venturi section of the upper column.
5. The two-stage circulating fluidized bed desulfurization system of claim 4, wherein the position at which the desulfurization ash is returned to the venturi section of the ascending tower after being filtered by the bag-type dust collector is set as a first position; the position of the desulfurizer added into the Venturi section of the ascending tower is set as a second position; the first position is the same height as the second position.
6. The two-stage circulating fluidized bed desulfurization system of claim 3, wherein the desulfurizing agent is discharged from the bottom of the descending tower with the flue gas and enters the bag-type dust collector, and is collected by the bag-type dust collector to form a cake of desulfurized ash on the surface of the filter bag, and the flue gas flowing through the bag-type dust collector is further desulfurized.
7. The two-stage circulating fluidized bed desulfurization system according to claim 1, wherein an atomization device is further disposed at the bottom of the ascending tower above the venturi section, and the atomization device is used for atomizing the humidified water to reduce the temperature of the flue gas.
8. A desulfurization process of the two-stage circulating fluidized bed desulfurization system of any one of claims 1 to 7, comprising:
adding the desulfurizer in the desulfurizer bin into the desulfurizing tower from the top of the venturi section and the top of the descending tower of the ascending tower respectively;
the flue gas enters the desulfurizing tower from the bottom of the ascending tower for a vulcanization reaction, flows upwards along the ascending tower, enters the top of the descending tower from the top of the ascending tower and is finally discharged from the bottom of the descending tower;
in the process of the vulcanization reaction, the flue gas reacts with a desulfurizer to generate desulfurized ash, and part of the desulfurized ash carried by the flue gas reflows into the ascending tower from the top of the ascending tower due to gravity and inertia sedimentation to become internally-circulated desulfurized ash; and the other part of the desulfurized ash is discharged from the bottom of the descending tower along with the flue gas.
9. The desulfurization process of the two-stage circulating fluidized bed desulfurization system according to claim 8, wherein the desulfurization ash discharged from the bottom of the lower column along with the flue gas enters the bag-type dust collector, is filtered by the bag-type dust collector, and is returned to the venturi section of the upper column.
10. The desulfurization process of the two-stage circulating fluidized bed desulfurization system according to claim 8, wherein the desulfurizing agent is discharged from the bottom of the lower column along with the flue gas into the bag-type dust collector, and is collected by the bag-type dust collector to form a desulfurization ash cake section on the surface of the filter bag, thereby continuously desulfurizing the flue gas flowing through the bag-type dust collector.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010092924.4A CN111249872A (en) | 2020-02-14 | 2020-02-14 | Two-section type circulating fluidized bed desulfurization system and desulfurization process |
Applications Claiming Priority (1)
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| CN111804131A (en) * | 2020-07-30 | 2020-10-23 | 威海市正大环保设备股份有限公司 | Two-stage desulfurization technology with downstream ash curtain |
| CN112221325A (en) * | 2020-10-20 | 2021-01-15 | 威海市正大环保设备股份有限公司 | Circulating double-feeding dry desulfurization method |
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