CN211733142U - Coal fired boiler flue gas denitration loading attachment - Google Patents
Coal fired boiler flue gas denitration loading attachment Download PDFInfo
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- CN211733142U CN211733142U CN201921926514.4U CN201921926514U CN211733142U CN 211733142 U CN211733142 U CN 211733142U CN 201921926514 U CN201921926514 U CN 201921926514U CN 211733142 U CN211733142 U CN 211733142U
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Abstract
The utility model discloses a coal fired boiler flue gas denitration loading attachment, including the feed bin that is used for the storage to take off the round pin agent, the top of feed bin is connected with the cyclone bottom through the pipeline of taking the rotary valve, and the bottom of feed bin is fixed on the feed bin support, and the import of the gas material in the cyclone top outside is passed through the pipeline and is connected with pneumatic conveying system. The utility model provides a current loading attachment area big, be unfavorable for the problem of installation. The utility model discloses the suitability is strong, the flexibility is good, the security is high and the environmental protection.
Description
Technical Field
The utility model relates to a loading attachment, concretely relates to coal fired boiler flue gas denitration loading attachment.
Background
A coal-fired boiler flue gas high polymer material flue gas denitration (PNCR) process is a novel denitration process. The denitration agent is a small particle made of reducing agent dry powder. The denitration agent particles are dry, non-polishing and free-flowing materials. The conveying process allows partial crushing, and moisture absorption and agglomeration are not easy.
As shown in fig. 1, the flue gas denitration (PNCR) process includes compressed air 1A, a gas-material mixing ejector 2A, a denitration agent bin 3A, a polymer denitration agent injection 4A, and a chain furnace hearth 5A, wherein a certain amount of reducing agent material needs to be stored in the denitration agent bin 3A to meet daily use and standby requirements. The conventional feeding mode of the storage bin is a lifter or an embedded scraper conveyor, and when the lifter or the embedded scraper conveyor is used for feeding, the occupied area of equipment is large. Most of boiler flue gas denitration projects for transforming, and when area is too big, be unfavorable for the development of project.
Disclosure of Invention
In order to overcome current loading attachment area big, be unfavorable for the defect of installation, the utility model provides a coal fired boiler flue gas denitration loading attachment that the suitability is strong, the flexibility is good, the security is high and environmental protection.
The utility model discloses a realize that the technical scheme that above-mentioned purpose adopted is:
the utility model provides a coal fired boiler flue gas denitration loading attachment, is including the feed bin that is used for the storage to take off the round pin agent, the top of feed bin is connected with cyclone bottom through the pipeline of taking the rotary valve, and the bottom of feed bin is fixed on the feed bin support, and the gas material import in the cyclone top outside passes through the pipeline and is connected with pneumatic conveying system.
The pneumatic conveying system is a method for conveying powder and granular solid materials in a pipeline by using air as conveying power. The air flow directly provides the energy needed for moving the material particles in the pipe, and the air flow in the pipe is driven by the pressure difference between the two ends of the pipe.
Further, pneumatic conveying system is negative pressure pneumatic conveying system, negative pressure pneumatic conveying system is including installing subassembly, the sack cleaner and the bottom of installing the air in the suction system at conveying system terminal and being equipped with hopper support and hopper that hopper support height is less than the feed bin support, the subassembly of air passes through the pipeline in the suction system and is connected with the sack cleaner top outside, and the sack cleaner bottom is connected with the cyclone top, flange joint is passed through with the pipeline top to the gas material import in the cyclone top outside, and the pipeline bottom stretches into in the hopper.
Preferably, the bottom of the pipeline is also connected with a suction nozzle.
Preferably, the component for sucking air in the system is a vacuum pump or a roots blower.
The negative pressure conveying system utilizes air in a Roots blower or a vacuum pump suction system arranged at the terminal of the conveying system to form negative pressure airflow which is lower than the atmospheric pressure in the conveying pipe. The material and the atmosphere enter a pipeline from a suction nozzle or a charging bucket of a suction point through mixing and are conveyed into a terminal separator along with the airflow. The material particles are separated from the air flow under the action of gravity or centrifugal force, and the air is filtered and dedusted and then discharged to the atmosphere through a fan. Because whole conveyor is in the negative pressure state, all air are inside to let out, have reduced the possibility of leaking the dust to the atmosphere in the transportation process, and the material can not be because of the pipeline damage is raised outward yet. However, the negative pressure delivery system has a limited delivery capacity because the higher the vacuum level, the lower the air density and the thinner the gas-solid mixture will tend to be as the delivery distance increases. The practical limit for the typical system pressure drop is 44KPa, which means a limit on the distance that negative pressure can be delivered. Meanwhile, the negative pressure conveying has higher requirement on the tightness of the dust remover and requires discharging under the air tightness condition, so that the structure of the dust removing equipment is complicated. Material carried over by leaks in the dust removal equipment can also damage the ventilator or blower.
The separation equipment and the dust remover are designed to be capable of withstanding a primary vacuum condition, the rated value is usually 54.7KPa, a compressed air pulse back-blowing type dust remover is generally adopted, and the dust remover has the advantages of small volume, simple structure, capability of realizing larger filtering air speed and high dust removal efficiency.
Further, pneumatic conveying system is malleation pneumatic conveying system, malleation pneumatic conveying system is equipped with hopper support and highly be less than hopper, the gyration feeder including installing air compression subassembly, the bottom that is used for letting in the air that is higher than the atmospheric pressure at the conveying system starting point, air compression subassembly passes through the flange joint with the gas material import in the cyclone top outside through the pipeline, passes through flange joint at the discharge gate of hopper bottom and gyration feeder one end, and the gyration feeder other end passes through flange joint on the pipeline between air compression subassembly and cyclone.
Further, the air compression assembly is a fan or an air compressor.
The positive pressure pneumatic conveying system utilizes a fan or an air compressor arranged at the starting point of the conveying system to introduce air higher than the atmospheric pressure into a feeding device, the air and the material are mixed and then are conveyed into a separator or a storage bin at the terminal point through a conveying pipeline, the air is discharged into the atmosphere after being filtered, and the positive pressure pneumatic conveying can be used for large-flow and long-distance conveying due to large conveying pressure difference. Compared with negative pressure delivery, air purification is easy.
Compared with other solid conveying systems, such as a belt conveyor, a vibration and spiral conveyor and a buried scraper conveyor, the pneumatic conveying system has the following advantages:
1. all solids conveying equipment in contrast to pneumatic conveying systems, pneumatic conveying systems are probably the most suitable method for continuous conveying of small particulate solid materials, and are also suitable for intermittent conveying of large batches of particulate materials from tankers, railway cars and cargo ships to storage silos.
2. The pneumatic conveying system has excellent flexibility in the design of fully utilizing the space. Belt and helical, buried flight conveyors convey in essentially only one direction. The pneumatic conveying system can convey materials upwards, downwards or around buildings, large-scale equipment and other obstacles, and can enable the conveying pipe to be higher than or avoid the space occupied by other operating devices.
3. The various solid delivery pumps, flow distributors, and receivers employed in pneumatic conveying systems operate very similarly to fluid equipment, so most pneumatic conveying devices are easily automated and operated from a central console. The cost of the operator can be saved.
4. Compared with other solid material conveying methods, the method has the advantages of low risk of fire and explosion in pneumatic conveying and outstanding safety.
5. A well designed pneumatic conveying system is often clean and eliminates environmental contamination. In the case of a vacuum delivery system, any air leaks are inward. The pollution of the material to the environment can be limited to the minimum. The main dust control points should be at the feeder inlet and the outlet of the solids collector, designed for dust free operation.
Drawings
The invention will now be further described with reference to the accompanying drawings, in which:
FIG. 1 is a flow diagram of a PNCR denitration system;
FIG. 2 is a schematic structural diagram of a feeding device of the negative pressure gas conveying system;
FIG. 3 is a schematic structural view of a feeding device of the positive pressure gas conveying system;
description of reference numerals: 1A, compressed air, 2A, a gas-material mixing ejector, 3A, a denitration agent bin, 4A, high-polymer denitration agent injection, 5A and a chain furnace hearth; 1. the device comprises a storage bin, 2, a rotary valve, 3, a cyclone separator, 4, a bag-type dust collector, 5, a hopper, 6, a pipeline, 7, a suction nozzle, 8, a component for sucking air in a system, 9, an air compression component, 10 and a rotary feeder.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Example 1
As shown in fig. 2, the coal fired boiler flue gas denitration loading attachment of this embodiment, including the feed bin that is used for the storage to take off the agent, the top of feed bin 1 is connected with 3 bottoms of cyclone through the pipeline that takes rotary valve 2, and the bottom of feed bin 1 is fixed on the feed bin support, and the gas material import in 3 top outsides of cyclone is connected with pneumatic conveying system through the pipeline.
The pneumatic conveying system is a method for conveying powder or granular solid materials in the pipeline 6 by using air as conveying power. The air flow directly provides the energy needed for moving the material particles in the pipe, and the air flow in the pipe is driven by the pressure difference between the two ends of the pipe.
Further, pneumatic transmission system is negative pressure pneumatic transmission system, negative pressure pneumatic transmission system is including installing subassembly 8, the sack cleaner 4 and the bottom of installing the suction system in conveying system terminal air and being equipped with hopper support and highly being less than the hopper 5 of feed bin support, the subassembly 8 of suction system interior air is connected with the sack cleaner top outside through pipeline 6, and sack cleaner bottom is connected with cyclone 3 top, the gas material import and the pipeline 6 top in the cyclone 3 top outside are through flange joint, and pipeline 6 bottom stretches into in the hopper 5.
Preferably, a suction nozzle 7 is further connected to the bottom of the pipeline 6.
Preferably, the component 8 for sucking air in the system is a vacuum pump or a roots blower.
The negative pressure conveying system utilizes air in a Roots blower or a vacuum pump suction system arranged at the terminal of the conveying system to form negative pressure airflow which is lower than the atmospheric pressure in the conveying pipe. The material is mixed with the atmosphere from the suction point 7 or bucket into the pipe 6 and is conveyed with the air flow into the end separator. The material particles are separated from the air flow under the action of gravity or centrifugal force, and the air is filtered and dedusted and then discharged to the atmosphere through a fan. Because whole conveyor is in the negative pressure state, all air are inside to let out, have reduced the possibility of leaking the dust to the atmosphere in the transportation process, and the material can not be because of pipeline 6 damage is raised outward yet. However, the negative pressure delivery system has a limited delivery capacity because the higher the vacuum level, the lower the air density and the thinner the gas-solid mixture will tend to be as the delivery distance increases. The practical limit for the typical system pressure drop is 44KPa, which means a limit on the distance that negative pressure can be delivered. Meanwhile, the negative pressure conveying has higher requirement on the tightness of the dust remover and requires discharging under the air tightness condition, so that the structure of the dust removing equipment is complicated. Material carried over by leaks in the dust removal equipment can also damage the ventilator or blower.
The separation equipment and the dust remover are designed to be capable of withstanding a primary vacuum condition, the rated value is usually 54.7KPa, a compressed air pulse back-blowing type dust remover is generally adopted, and the dust remover has the advantages of small volume, simple structure, capability of realizing larger filtering air speed and high dust removal efficiency.
Example 2
As shown in fig. 3, the coal fired boiler flue gas denitration loading attachment of this embodiment, including the feed bin that is used for the storage to take off the round pin agent, the top of feed bin 1 is connected with cyclone 3 bottom through rotary valve 2, and the bottom of feed bin 1 is fixed on the feed bin support, and the gas material import in the outside of cyclone 3 top is connected with pneumatic conveying system through the pipeline.
The pneumatic conveying system is a method for conveying powder or granular solid materials in the pipeline 6 by using air as conveying power. The air flow directly provides the energy needed for moving the material particles in the pipe, and the air flow in the pipe is driven by the pressure difference between the two ends of the pipe.
Further, pneumatic conveying system is malleation pneumatic conveying system, malleation pneumatic conveying system is equipped with hopper support and highly be less than hopper 5, the gyration feeder 10 of feed bin support including installing air compression subassembly 9, the bottom that is used for letting in the air that is higher than the atmospheric pressure at the conveying system starting point, air compression subassembly 9 passes through flange joint through the gas material import in pipeline 6 and the 3 top outsides of cyclone, passes through flange joint at the discharge gate of 5 bottoms of hopper and gyration feeder 10 one end, and gyration feeder 10 other end passes through flange joint on pipeline 6 between air compression subassembly 9 and cyclone 3.
Further, the air compression assembly 9 is a fan or an air compressor.
The positive pressure pneumatic conveying system utilizes a fan or an air compressor arranged at the starting point of the conveying system to introduce air higher than the atmospheric pressure into a feeding device, the air and the material are mixed and then are conveyed into a separator or a storage bin at the terminal point through a conveying pipeline 6, the air is discharged into the atmosphere after being filtered, and the positive pressure pneumatic conveying can be used for large-flow and long-distance conveying due to large conveying pressure difference. Compared with negative pressure delivery, air purification is easy.
The comparison of various parameters of the feeding device of the negative-pressure pneumatic conveying system in the embodiment 1 and the feeding device of the positive-pressure pneumatic conveying system in the embodiment 2 is shown in table 1.
TABLE 1 comparison of the two delivery modalities
| Item | Negative pressure | Positive pressure |
| Feeding of the feedstock | Simple and easy | Complexity of |
| Dust | Is free of | Leakage-proof |
| Sundries | Is not easy to mix into | Is easy to mix into |
| Separator seal | Difficulty in | Easy to use |
| Operating pressure | Less than 1 x 105Pa | Less than 7 x 105Pa |
| Distance of conveyance | Short length | Long and long |
In summary, when the transport distance is long, positive pressure transport is considered, and when the transport distance is short, negative pressure transport is considered.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (2)
1. A coal-fired boiler flue gas denitration loading attachment, characterized by, including the feed bin used for storing the agent of removing the stock, the top of the said feed bin is connected with bottom of cyclone separator through the pipeline with rotary valve, the bottom of the feed bin is fixed on feed bin support, the gas material inlet outside the top of cyclone separator is connected with pneumatic conveying system through the pipeline; the pneumatic conveying system is a positive-pressure pneumatic conveying system, the positive-pressure pneumatic conveying system comprises an air compression assembly and a rotary feeder, the air compression assembly and the bottom of the positive-pressure pneumatic conveying system are used for introducing air higher than the atmospheric pressure, the hopper and the rotary feeder are arranged at the starting point of the conveying system, the hopper and the bottom of the positive-pressure pneumatic conveying system are provided with a hopper support and are highly lower than a material bin support, the air compression assembly is connected with an air material inlet in the outer side of the top of a cyclone separator through a pipeline, a discharge port in the bottom of the hopper is connected with one end of the rotary feeder through.
2. The coal-fired boiler flue gas denitration loading attachment of claim 1, characterized in that, the air compression subassembly is fan or air compressor.
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| CN201921926514.4U CN211733142U (en) | 2019-11-11 | 2019-11-11 | Coal fired boiler flue gas denitration loading attachment |
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| CN201921926514.4U CN211733142U (en) | 2019-11-11 | 2019-11-11 | Coal fired boiler flue gas denitration loading attachment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115893010A (en) * | 2023-01-12 | 2023-04-04 | 航天氢能新乡气体有限公司 | Low-order pulverized coal pneumatic conveying device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115893010A (en) * | 2023-01-12 | 2023-04-04 | 航天氢能新乡气体有限公司 | Low-order pulverized coal pneumatic conveying device |
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