CN211189701U - Optimally designed semi-dry desulfurization ash recycling system - Google Patents
Optimally designed semi-dry desulfurization ash recycling system Download PDFInfo
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- CN211189701U CN211189701U CN201922197592.1U CN201922197592U CN211189701U CN 211189701 U CN211189701 U CN 211189701U CN 201922197592 U CN201922197592 U CN 201922197592U CN 211189701 U CN211189701 U CN 211189701U
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Abstract
An optimally designed semi-dry desulfurization ash recycling system belongs to the technical field of flue gas purification. The problems that the utilization rate of an absorbent in the existing desulfurization semi-dry method system is low, and the stable operation of the semi-dry method desulfurization system is influenced are solved. The technical points are as follows: the flue gas outlet of the semi-dry absorption tower is connected with the inlet of a bag-type dust collector, the dust hopper of the bag-type dust collector at the lower end of the bag-type dust collector is connected with a ship-shaped dust hopper, the bottom surface of the ship-shaped dust hopper is connected with a buffering dust hopper through a pipeline, the bottommost end of the bottom surface of the ship-shaped dust hopper is connected with the diameter-expanding section of the semi-dry absorption tower through a recirculation air chute, and the recirculation air chute is sequentially provided with a recirculation dust flow shutoff valve, a recirculation dust flow regulating valve and a recirculation dust flow meter from right to left; the side wall of the ship-shaped ash bucket is provided with a ship-shaped ash bucket charge level indicator. The utility model discloses be favorable to promoting the utilization ratio of desulfurization absorbent in the circulating ash, increase actual calcium-sulfur ratio, improve desulfurization efficiency, make semi-dry desulfurization system steady operation.
Description
Technical Field
The utility model relates to a semidry process desulfurization ash recirculation system, concretely relates to semidry process desulfurization ash recirculation system of optimal design belongs to flue gas purification technical field such as thermoelectricity, steel sintering, coking, cement kiln, glass kiln, chemical industry, metallurgy.
Background
The semi-dry desulfurization technology is one of the ultra-low emission treatment technologies of flue gas pollutants, is mainly applied to small and medium-sized units burning medium-low sulfur coal, and compared with wet flue gas desulfurization, the semi-dry desulfurization system has the following advantages: the system is simple, the cost is low, and the operation is reliable; no wastewater is generated and discharged, and the generated final solid product is easy to treat; the purified flue gas has higher temperature, does not need to be reheated, is favorable for the exhaust diffusion of a chimney, and can effectively eliminate the phenomena of 'white smoke' and colored smoke plume and the like. Initial SO of flue gas in sintering, coke oven, cement and other non-electric industries2The concentration is low, and the relative desulfurization efficiency is low, so the semi-dry desulfurization technology has very wide application prospect in the flue gas treatment of the non-electric industry.
However, the existing desulfurization semi-dry method system has the problems of inaccurate material level of an ash hopper, blockage of circulating ash, unstable bed pressure of an absorption tower, low utilization rate of an absorbent, large fluctuation of desulfurization efficiency and the like, and the stable operation of the semi-dry method desulfurization system is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an optimal design's semidry process desulfurization ash recirculation system to absorbent utilization ratio is low in solving current desulfurization semidry process system, influences the problem of semidry process desulfurization system steady operation.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
an optimally designed semi-dry desulfurization ash recycling system comprises a semi-dry absorption tower, a bag-type dust collector, a ship-shaped ash bucket, a recycling air chute, a buffering ash bucket, a ship-shaped ash bucket level indicator, a recycling ash flow shutoff valve, a recycling ash flow regulating valve and a recycling ash flowmeter;
the flue gas outlet of the semi-dry absorption tower is connected with the inlet of a bag-type dust collector, the dust hopper of the bag-type dust collector at the lower end of the bag-type dust collector is connected with a ship-shaped dust hopper, the bottom surface of the ship-shaped dust hopper is an inclined surface, the inclined surface is connected with a buffering dust hopper through a pipeline, the bottommost end of the bottom surface of the ship-shaped dust hopper is connected with a diameter-expanding section of the semi-dry absorption tower through a recirculation air chute, and the recirculation air chute is sequentially provided with a recirculation dust flow shutoff valve, a recirculation dust flow regulating valve and a recirculation dust flow meter from right to left; the side wall of the ship-shaped ash bucket is provided with a ship-shaped ash bucket charge level indicator.
Discharging ash-containing gas after reaction in the semidry absorption tower from a flue gas outlet, and feeding the ash-containing gas into a bag-type dust collector; solid particles removed by the bag-type dust remover enter a ship-shaped dust hopper through a dust hopper of the bag-type dust remover; most ash in the ship-shaped ash bucket is controlled by a recirculated ash flow regulating valve, and is returned to an expanding section of the absorption tower by the recirculated air chute to enter a straight section of the absorption tower, and continuously participates in reaction to form high-concentration dense-phase circulation, so that the gas-solid heat transfer and mass transfer processes in the absorption tower are enhanced, and the reaction efficiency and the reaction speed are greatly improved; the material level meter of the ship-shaped ash bucket detects that when the ash level in the ship-shaped ash bucket is at a high material level, the ash enters the buffer hopper for temporary storage.
Further: and a gate valve is arranged between the ash bucket of the bag-type dust collector and the ship-shaped ash bucket. So set up, the push-pull valve is in the open mode during normal operating, when certain bin of sack cleaner needs online maintenance, closes the push-pull valve of corresponding ash bucket.
Further: the bottom surface of the ship-shaped ash bucket is connected with a first fluidizing air pipeline, and a ship-shaped ash bucket fluidizing fan is installed on the first fluidizing air pipeline. So set up, the fluidization wind is formed in the ship type ash bucket, and fluidization wind makes the ash in the ship type ash bucket be in the fluidization state.
Further: and a ship-shaped ash bucket fluidization air pressure gauge is arranged on the first fluidization air pipeline. The ash material level of the ship-shaped ash bucket is monitored by the ship-shaped ash bucket fluidization air pressure gauge, the misoperation caused by false material level alarm of the ship-shaped ash bucket material level gauge is effectively avoided, and the material level height in the ship-shaped ash bucket is ensured.
Further: and a ship-shaped ash bucket fluidization air heater is arranged on the first fluidization air pipeline, and a ship-shaped ash bucket heater is arranged on the ship-shaped ash bucket. The ship-shaped ash bucket fluidized air heater and the ship-shaped ash bucket heater can adopt a steam heating mode or an electric heating mode, preferably an electric heating mode, and prevent the condensation and hardening of fly ash in the ash bucket.
Further: and the first fluidizing air pipeline is provided with a ship-shaped ash bucket fluidizing air flowmeter. And carrying out flow monitoring.
Further: the angle of inclination of the recirculating air chute is between 6 and 10 degrees.
Further: the recycle air chute is designed into two independent spaces separated from each other up and down, and is defined as an upper space and a lower space, and the two spaces are separated by a fluidization plate made of canvas; and a second fluidizing air pipeline is connected to the bottom surface of the lower space, and a recirculating air chute fluidizing fan is mounted on the second fluidizing air pipeline. So arranged, the upper space is used for carrying the circulating ash material, and the lower space is used for providing fluidizing air for the fluidizing plate so as to keep the smooth flowing of the material in the upper space.
Further: and a recirculation air chute fluidization air pressure gauge, a recirculation air chute fluidization air heater and a recirculation air chute fluidization air flow meter are arranged on the second fluidization air pipeline.
Further: a chute heater is disposed on the recirculation air chute. The chute heater can adopt a steam heating mode or an electric heating mode, preferably an electric heating mode, and prevents materials from being condensed and hardened.
Further: the bag-type dust remover performs dust blowing by adopting a rotary blowing dust blowing mode. Compared with a line blowing mode, the occupied area of the bag-type dust collector can be effectively reduced; the blowing pressure is reduced, and the service life of the cloth bag is prolonged; the online maintenance of the bag-type dust collector is facilitated.
The utility model discloses the effect that reaches does:
(1) the recycled ash returned to the absorption tower through the recycled ash air chute contains a large amount of unreacted completely-absorbed agents, and particles in the absorption tower collide with each other, so that the unreacted absorbed agents wrapped in the desulfurized ash are exposed and participate in the reaction again, the utilization rate of the absorbed agents is favorably improved, and the actual calcium-sulfur ratio in the absorption tower is far greater than the apparent calcium-sulfur ratio.
(2) The ash level of the ship-shaped ash bucket is monitored and controlled by the fluidization wind pressure instead of being monitored and controlled by a conventional level meter on line. The material level of the conventional semi-dry desulfurization ship-shaped ash bucket is monitored by adopting a material level meter, false alarm often occurs in the material level meter in actual operation, and false material level occurs in the ash bucket material level. The utility model discloses an ash bucket fluidization wind pressure controls, monitors the material level in the ash bucket through fluidization wind pressure, can control the circulation ash content in the ash bucket accurately, ensures circulation ash system normal operating.
(3) The gate valve is arranged between the ash bucket of the bag-type dust collector and the ship-shaped ash bucket, so that the bag-type dust collector can be conveniently overhauled on line. Under the normal operation state, the gate valve is in an open state, and ash in the ash bucket of the cloth bag falls into the ship-shaped ash bucket under the action of gravity; when a certain chamber of the bag-type dust collector needs to be overhauled on line, the corresponding gate valve can be closed, and the bag-type dust collector bin needing to be overhauled is isolated from the ship-shaped dust hopper.
(4) The bag-type dust remover adopts a rotary ash spraying mode, and has advantages in the aspects of space arrangement, ash blowing pressure, convenience in maintenance and the like compared with the common line spraying mode. The utilization rate of the rotary blowing space is high, more filter bags can be arranged in the same space, and the filtering area is increased by 20-30%; the ash removal pressure of rotary blowing and line blowing is different, the pressure of a rotary blowing ash removal air source is 0.06-0.15 Mpa, the pressure of a fixed line blowing ash removal air source is 0.2-0.5 Mpa, and the lower the blowing pressure is, the smaller the abrasion to the cloth bag is, so that the service life of the cloth bag can be effectively prolonged; the rotary arm for rotary blowing pulse ash removal can rotate freely, a cloth bag and a bag cage can be taken out and put in conveniently, the blowing pipe of the line blowing pulse bag dust remover is fixed, and the filter bag can be replaced only after the pulse blowing pipe is detached; the rotary blowing dust remover has better maintenance space, and can replace the cloth bag on line.
The utility model discloses optimally designed semi-dry desulfurization ash recirculation system is favorable to increasing the utilization ratio of desulfurization absorbent, improving desulfurization efficiency, optimizing semi-dry desulfurization system's steady operation.
Drawings
FIG. 1 is a structural diagram of a semi-dry desulfurized fly ash recycling system optimally designed by the utility model;
in the figure: 1-a semi-dry absorption tower; 2-bag dust collector; 3-ash bucket of bag dust collector; 4-a boat-shaped ash bucket; 5-a recirculating air chute; 6-expanding the diameter section; 7-a gate valve; 8-buffer ash bucket; 9-ship type ash bucket fluidization fan; 10-a boat-shaped ash bucket fluidized air heater; 11-ship type ash bucket fluidization wind flow meter; 12-a ship-shaped ash bucket fluidization air pressure gauge; 13-a boat type ash bucket level indicator; 14-boat type hopper heater; 15-recirculation air chute fluidizing fan; 16-recirculating air chute fluidized air heater; 17-recirculating air chute fluidized air flow meter; 18-recirculating air chute fluidized air pressure gauge; 19-a recirculating ash flow shutoff valve; 20-recirculated ash flow regulating valve; 21-a recycled ash flowmeter; 22-chute heater; 23-a control valve; 24-star feeder.
Detailed Description
Exemplary embodiments of the present invention will be described hereinafter with reference to the accompanying drawings. In the interest of clarity and conciseness, not all features of an actual implementation are described in the specification. It will of course be appreciated that in the development of any such actual embodiment, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which will vary from one implementation to another. Moreover, it will be appreciated that such a development effort might be complex and time-consuming, but would nevertheless be a routine undertaking for those of ordinary skill in the art having the benefit of this disclosure.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including 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 will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The meaning of "inside and outside" in the present invention means that the direction inside the pointing device is inside and vice versa for the device itself, rather than being specifically limited for the device mechanism of the present invention.
The utility model discloses in the meaning of "left and right" indicate that the reader is just when the drawing, the left side of reader is left promptly, and the right of reader is right promptly, and is not right the utility model discloses a specific limited of device mechanism.
The term "connected" as used herein may mean either a direct connection between elements or an indirect connection between elements through other elements.
It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the device structures and/or processing steps closely related to the solution according to the present invention are shown in the drawings, and other details not relevant to the present invention are omitted. Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Example (b): as shown in fig. 1, the optimally designed semi-dry desulfurized fly ash recycling system according to this embodiment includes a semi-dry absorption tower 1, a bag-type dust collector 2, a boat-shaped ash hopper 4, a recycled air chute 5, a buffer ash hopper 8, a boat-shaped ash hopper fluidizing fan 9, a boat-shaped ash hopper fluidizing air heater 10, a boat-shaped ash hopper fluidizing air flow meter 11, a boat-shaped ash hopper fluidizing air pressure gauge 12, a boat-shaped ash hopper material level gauge 13, a boat-shaped ash hopper heater 14, a recycled air chute fluidizing fan 15, a recycled air chute fluidizing air heater 16, a recycled air chute fluidizing air flow meter 17, a recycled air chute fluidizing air pressure gauge 18, a recycled ash flow shutoff valve 19, a recycled ash flow regulating valve 20, a recycled ash flow meter 21, a chute heater 22, a control valve 23, and a star feeder 24.
The flue gas outlet of the semidry absorption tower 1 is connected with the inlet of a bag-type dust collector 2, the bag-type dust collector ash bucket 3 at the lower end of the bag-type dust collector 2 is connected with a ship-shaped ash bucket 4, the bottom surface of the ship-shaped ash bucket 4 is an inclined plane, the inclined plane is connected with a buffering ash bucket 8 through a pipeline, the pipeline is provided with a control valve 23 and a star-shaped feeder 24, the bottommost end of the bottom surface of the boat-shaped ash hopper 4 is connected with an expanding section 6 of the absorption tower 1 by a recirculating air chute 5, and the connection position is arranged from a Venturi to the expanding section of the absorption tower, because the flow velocity at the outlet of the Venturi is higher, the circulating ash can be ensured to completely enter the absorption tower for further reaction, and a large amount of unreacted completely absorbent is contained in the solid particles which return to the absorption tower through the recycling air chute 5, so that the actual calcium-sulfur ratio in the absorption tower is far greater than the apparent calcium-sulfur ratio; a recycle ash flow shut-off valve 19, a recycle ash flow regulating valve 20 and a recycle ash flowmeter 21 are sequentially arranged on the recycle air chute 5 from right to left; the side wall of the ship-shaped ash bucket 4 is provided with a ship-shaped ash bucket material level indicator 13.
A gate valve 7 is arranged between the bag-type dust collector ash bucket 3 and the ship-type ash bucket 4; the bottom surface of the ship-shaped ash bucket 4 is connected with a first fluidizing air pipeline, and a ship-shaped ash bucket fluidizing fan 9, a ship-shaped ash bucket fluidizing air pressure gauge 12, a ship-shaped ash bucket heater 14 and a ship-shaped ash bucket fluidizing air flow meter 11 are arranged on the first fluidizing air pipeline. The ash level in the ship-shaped ash bucket is monitored in real time, and meanwhile, a high level indicator, a medium level indicator and a low level indicator are arranged in the ship-shaped ash bucket to assist in monitoring the ash level of the ash bucket. The material level of the conventional semi-dry desulfurization ship-shaped ash bucket is monitored by adopting a material level meter, and false material level and false alarm often occur in the material level meter in actual operation, so that the material level measurement is inaccurate. This embodiment adopts ash bucket fluidization wind pressure to monitor the material level in the ash bucket, can accurately control the circulation ash volume in the ash bucket, ensures the circulation ash system normal operating.
The recirculating air chute 5 is a device for conveying materials and air by using air as power after the materials and the air are mixed, has the advantages of simple structure, large conveying capacity, low energy consumption and the like compared with a mechanical conveying mode, and is more economical conveying equipment for powdery or granular materials. The angle of inclination of said recirculation air chute 5 is 10 °, designed as two separate spaces separated up and down, defined as an upper space and a lower space, separated by a fluidization plate made of canvas; and a second fluidized air pipeline is connected to the bottom surface of the lower space, and a recirculation air chute fluidizing fan 15, a recirculation air chute fluidizing air pressure gauge 18, a recirculation air chute fluidizing air heater 16 and a recirculation air chute fluidizing air flow meter 17 are mounted on the second fluidized air pipeline. The recirculation air chute 5 is provided with a chute heater 22. When fluidizing air enters the material layer through the fluidizing plate to fluidize the circulating ash material, the repose angle of the circulating ash material is reduced, the fluidity is increased, the circulating ash material has the property similar to that of fluid, and the circulating ash material flows in the air chute under the action of gravity, so that the conveying purpose is achieved. The mass flow of recycled ash in the recycled air chute 5 is automatically controlled by a recycled ash electrovalve according to the absorber pressure drop.
The bag-type dust collector 2 performs dust blowing by adopting a rotary blowing dust blowing mode. Compared with a line blowing mode, the occupied area of the bag-type dust collector can be effectively reduced; the blowing pressure is reduced, and the service life of the cloth bag is prolonged; the online maintenance of the bag-type dust collector is facilitated. The ash cleaning system consists of an air bag, a pulse valve, a rotary blowing pipe, a nozzle and a rotary mechanism. Each blowing arm is provided with a plurality of blowing nozzles, the number of outer rings is large, the number of inner rings is small, and the arrangement mode is designed according to the rotation probability. When the dust is cleaned, the blowing arm rotates, and the pulse valve is opened for a short time to blow compressed air in the air bag into each filter bag, so that the filter bags are expanded and shaken to clean dust. The ash removal pressure is 0.06-0.15 MPa. The ash removal adopts two control modes of pressure difference and constant frequency blowing, and the constant frequency automatic control ash blowing mode is preferably selected to ensure the uniform distribution of ash in the ship-shaped ash bucket.
In this embodiment, when the fluidization wind enters the material bed after passing through the fluidization plate to fluidize the circulating ash material, the repose angle of the circulating ash material is reduced, the fluidity is increased, and the circulating ash material has a fluid-like property, and flows along the inclination angle of the recirculating air chute in the recirculating air chute under the action of gravity, so that the conveying purpose is achieved. The recycled ash enters the semidry absorption tower, unreacted slaked lime continues to react, the recycled ash forms high-concentration dense-phase circulation, the gas-solid heat transfer and mass transfer processes in the semidry absorption tower are enhanced, the reaction efficiency and the reaction speed are greatly improved, the utilization rate of the slaked lime is increased, and the actual calcium-sulfur ratio in the semidry absorption tower is far greater than the apparent calcium-sulfur ratio; the recycling air chute can effectively solve the problems of blockage, ash leakage and the like of an ash returning device such as a packing auger and the like in a mechanical conveying mode, and has the advantages of simple structure, high conveying capacity, low energy consumption and the like. The semi-dry desulfurization ash recycling system is beneficial to stable operation of the semi-dry desulfurization system, improves the utilization rate of a semi-dry desulfurization absorbent, and improves desulfurization efficiency.
The above embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present invention.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. An optimally designed semi-dry desulfurization ash recycling system is characterized by comprising a semi-dry absorption tower (1), a bag-type dust collector (2), a ship-shaped ash hopper (4), a recycling air chute (5), a buffering ash hopper (8), a ship-shaped ash hopper material level meter (13), a recycling ash flow shutoff valve (19), a recycling ash flow regulating valve (20) and a recycling ash flow meter (21);
the flue gas outlet of the semi-dry absorption tower (1) is connected with the inlet of a bag-type dust collector (2), the bag-type dust collector ash bucket (3) at the lower end of the bag-type dust collector (2) is connected with a ship-shaped ash bucket (4), the bottom surface of the ship-shaped ash bucket (4) is an inclined surface, the inclined surface is connected with a buffering ash bucket (8) through a pipeline, the bottommost end of the bottom surface of the ship-shaped ash bucket (4) is connected with an expanding section (6) of the semi-dry absorption tower (1) through a recirculation air chute (5), and a recirculation ash flow shutoff valve (19), a recirculation ash flow regulating valve (20) and a recirculation ash flow meter (21) are sequentially arranged on the recirculation air chute (5) from right to left; the side wall of the ship-shaped ash bucket (4) is provided with a ship-shaped ash bucket charge level indicator (13).
2. The optimally designed semi-dry desulfurized fly ash recycling system according to claim 1, wherein: a gate valve (7) is arranged between the bag-type dust collector ash bucket (3) and the ship-shaped ash bucket (4).
3. The optimally designed semi-dry desulfurized fly ash recycling system according to claim 1 or 2, characterized in that: the bottom surface of the ship-shaped ash bucket (4) is connected with a first fluidizing air pipeline, and a ship-shaped ash bucket fluidizing fan (9) is installed on the first fluidizing air pipeline.
4. The optimally designed semi-dry desulfurized fly ash recycling system according to claim 3, wherein: and a ship-shaped ash bucket fluidization air pressure gauge (12) is arranged on the first fluidization air pipeline.
5. The optimally designed semi-dry desulfurized fly ash recycling system according to claim 4, wherein: the first fluidized air pipeline is provided with a ship-shaped ash bucket fluidized air heater (10), and the ship-shaped ash bucket (4) is provided with a ship-shaped ash bucket heater (14).
6. The optimally designed semi-dry desulfurized fly ash recycling system according to claim 5, wherein: and a ship-shaped ash bucket fluidization wind flow meter (11) is arranged on the first fluidization wind pipeline.
7. The optimally designed semi-dry desulfurized fly ash recycling system according to claim 1, wherein: the angle of inclination of the recirculating air chute (5) is between 6 and 10 degrees.
8. The optimally designed semi-dry desulfurized fly ash recycling system according to claim 1 or 7, characterized in that: the recirculation air chute (5) is designed as two separate spaces separated up and down, defined as an upper space and a lower space, separated by a fluidization plate made of canvas; and a second fluidizing air pipeline is connected to the bottom surface of the lower space, and a recirculating air chute fluidizing fan (15) is mounted on the second fluidizing air pipeline.
9. The optimally designed semi-dry desulfurized fly ash recycling system according to claim 8, wherein: and a recirculation air chute fluidization air pressure gauge (18), a recirculation air chute fluidization air heater (16) and a recirculation air chute fluidization air flow meter (17) are arranged on the second fluidization air pipeline.
10. The optimally designed semi-dry desulfurized fly ash recycling system according to claim 9, wherein: a chute heater (22) is arranged on the recirculation air chute (5).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114259863A (en) * | 2021-12-29 | 2022-04-01 | 浙江碧连天环境技术有限公司 | Semi-dry high-circulation-rate flue gas desulfurization and dust removal integrated system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114259863A (en) * | 2021-12-29 | 2022-04-01 | 浙江碧连天环境技术有限公司 | Semi-dry high-circulation-rate flue gas desulfurization and dust removal integrated system |
| CN114259863B (en) * | 2021-12-29 | 2023-06-27 | 浙江碧连天环境技术有限公司 | Semi-dry high-circulation-rate flue gas desulfurization and dust removal integrated system |
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