CN214332741U - Circulating fluidized bed fly ash recycling system - Google Patents

Circulating fluidized bed fly ash recycling system Download PDF

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Publication number
CN214332741U
CN214332741U CN202120147422.7U CN202120147422U CN214332741U CN 214332741 U CN214332741 U CN 214332741U CN 202120147422 U CN202120147422 U CN 202120147422U CN 214332741 U CN214332741 U CN 214332741U
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fly ash
fluidized bed
combustion furnace
circulating fluidized
dust remover
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周海涛
朱晨军
任强
丁明雷
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Keda Clean Energy Co Ltd
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Keda Clean Energy Co Ltd
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Abstract

The utility model discloses a circulating fluidized bed flying dust system of recycling belongs to the coal gasification field. Difficult and with high costs problem is handled to flying dust among the prior art, the utility model provides a circulating fluidized bed flying dust system of recycling, it includes the ash bin, with the ash bin through lock fill be connected fire burning furnace, the exhanst gas outlet who fires on burning furnace passes through cyclone and is connected with the pre-heater, the bottom of firing burning furnace is equipped with row cinder pond, fan, lock fill and dust remover are equallyd divide and do not be connected with the pre-heater, the dust remover is connected with the ash bin. The utility model carries out the circular combustion treatment on the fly ash, the carbon content of the residue is extremely low, the particle size, the strength and other properties are greatly improved compared with the fly ash, and the flue gas generated by combustion is fully utilized, thereby greatly saving the cost; the operation is simple and convenient, the whole system can effectively change the fly ash into valuable, the requirement of environmental protection is met, the purposes of saving resources and energy sources are achieved, the comprehensive utilization rate is high, and the application value and the market value are high.

Description

Circulating fluidized bed fly ash recycling system
Technical Field
The utility model belongs to the coal gasification field, more specifically say, relate to a circulating fluidized bed flying dust system of recycling.
Background
The circulating fluidized bed system is a mainstream technology in the field of clean coal gasification, effectively improves the utilization rate of coal, reduces the pollution to the environment, and is widely applied in many fields, but in the operation process, a large amount of fly ash with small particle size is inevitably generated, and the fly ash is finally collected through a dust removal system along with the carrying-out of high-temperature coal gas. A set of gas production rate of 40000Nm3The fly ash produced by the circulating fluidized bed system per hour is about 3 tons, and the carbon content of the part of the fly ash can reach 60 percent or even more than 70 percent, so the part of the fly ash has very considerable combustion heat value. On the other hand, the fly ash has small and soft particle size, large volume ratio, great harm to the environment and inconvenient transportation and storage, so that the circulating fluidized bed system is a relatively headache problem in the industry for how to treat and utilize the fly ash. Currently, in the industry, there are several methods for treating fly ash: (1) the circulating fluidized bed system is used by itself, a small proportion of fly ash is humidified, and is mixed with coal and granulated and then returned to the gasification furnace for combustion gasification reaction, the effect of the method is not ideal, on one hand, the fly ash granulation technology is not stable, the particle size is difficult to control, the equipment failure rate is high, on the other hand, the fly ash mixed with particles is returned to the furnace, the gasification reaction efficiency is also influenced, the final heat value of the product coal gas is influenced, and the requirements of customers cannot be met. (2) After being digested and absorbed by a third party and mixed with large-particle gravels or filling soil, the obtained mixture is used as roadbed filling, and the treatment mode is relatively complicated, time-consuming and labor-consuming on one hand, and poor in various performances such as strength, stability, drainage property and the like of a paved roadbed on the other hand, so that common municipal administration units are not willing to adopt mixed fly ash as the roadbed filling. The other treatment method is to directly send the fly ash to the boiler of the owner's own power plant to be burnt together with the coal, and the treatment mode requires that a large power plant boiler is matched near a circulating fluidized bed boundary area, but the effect is not ideal, and on one hand, the fly ash conveying is interrupted and not idealAnd on the other hand, fly ash addition also increases the abrasion of boiler equipment in a power plant and increases the operation and maintenance cost. From the above, fly ash, which is a by-product of the circulating fluidized bed, inherently contains considerable calorific value of combustion, but is difficult to handle.
Corresponding improvement is also made aiming at the problems, for example, Chinese patent application No. CN201310518978.2, published as 2014 1/29, which discloses a fly ash recycling device and a fly ash recycling method for a circulating fluidized bed boiler, wherein a flue gas outlet of the boiler is communicated with a cyclone separator, a gas outlet of the cyclone separator is communicated with a dust remover through a heat exchanger, a solid outlet of the cyclone separator is communicated with a large-particle high-temperature ash inlet of a material returning device, a gas outlet of the dust remover is communicated with a chimney, a solid outlet of the dust remover is communicated with an ash conveying main pipe through a bin pump, one path of an outlet of the ash conveying main pipe is communicated with an ash storage, the other path of the outlet of the ash conveying main pipe is communicated with a circulating ash inlet of the material returning device, and an outlet of the material returning device is communicated with a boiler furnace. The disadvantages of the patent are that: the energy utilization rate of the whole system is poor.
Also like Chinese patent application No. CN201821354065.6, published as 2019, 4 and 23, the patent discloses a coupled coal gasification system, and belongs to the technical field of clean and efficient utilization of coal. A coupled coal gasification system comprises a gasification system, a waste heat recovery system, a dust removal system and a fly ash circulation system which are sequentially connected, an entrained flow gasifier is connected to the lower reaches of a fluidized bed gasifier, the gasification system further comprises a cyclone mixer, a gasification burner is arranged at the upper end of the entrained flow gasifier, and the fly ash circulation system is connected with the gasification burner. The disadvantages of the patent are that: the structure is complex, and the utilization rate of the fly ash is poor.
SUMMERY OF THE UTILITY MODEL
1. Problems to be solved
To the difficult and with high costs problem of flying dust processing among the prior art, the utility model provides a circulating fluidized bed flying dust system of recycling. The utility model carries out the circular combustion treatment on the fly ash, the carbon content of the residue is extremely low, the particle size, the strength and other properties are greatly improved compared with the fly ash, and the flue gas generated by combustion is fully utilized, thereby greatly saving the cost; the operation is simple and convenient, the whole system can effectively change the fly ash into valuable, the requirement of environmental protection is met, the purposes of saving resources and energy sources are achieved, the comprehensive utilization rate is high, and the application value and the market value are high.
2. Technical scheme
In order to solve the above problems, the utility model adopts the following technical proposal.
A fly ash recycling system of a circulating fluidized bed comprises an ash bin and a combustion furnace connected with the ash bin through a lock hopper, wherein a smoke outlet on the combustion furnace is connected with a preheater through a cyclone separator, a slag discharging pool is arranged at the bottom of the combustion furnace, a fan, the lock hopper and a dust remover are respectively connected with the preheater, and the dust remover is connected with the ash bin.
Furthermore, a waste heat recoverer is arranged between the preheater and the dust remover.
Furthermore, the waste heat recovery device comprises a steam drum, the combustion furnace and the waste heat recovery device are respectively connected with the steam drum, and the water supplementing device is connected with the steam drum and is used for supplementing water into the steam drum.
Furthermore, the combustion furnace is provided with a plurality of fly ash burners, fly ash in the lock hopper enters the combustion furnace through the fly ash burners, and the plurality of fly ash burners are uniformly arranged along the circumferential direction of the combustion furnace.
Furthermore, a burner cover is arranged on the outer side of the fly ash burner.
Furthermore, a water-cooled wall is arranged at the upper part of the inner wall of the combustion furnace and is connected with the steam pocket; the lower part of the inner wall of the combustion furnace is provided with a wear-resistant coating.
Furthermore, the surface of the water wall is provided with refractory materials.
Furthermore, the dust remover is a bag-type dust remover.
3. Advantageous effects
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the utility model discloses a send the flying dust into combustion furnace and carry out combustion processing, the flying dust fully burns and reduces the dust concentration, alleviates the harm to the environment, realizes gas-solid separation through cyclone with the high temperature flue gas that the combustion furnace produced simultaneously, utilizes the high temperature flue gas to preheat the normal atmospheric temperature air in the pre-heater, and the air after preheating enters into the lock fill and carries the flying dust and as the gasification agent simultaneously makes the flying dust burn fully, improves gasification efficiency; and no additional fly ash conveying device is needed, so that the cost is saved; the flue gas after heat exchange is further dedusted by a deduster, and the purity is improved to be used as greenhouse gas or protective gas; the whole system can effectively change the fly ash into valuable, not only meets the requirement of environmental protection, but also achieves the purpose of saving resources and energy, has extremely high comprehensive utilization rate, and has extremely high use value and market value;
(2) the utility model discloses add between preheater and dust remover and be equipped with waste heat recoverer for further carry out heat recovery to the flue gas after the heat transfer and use, be connected the steam pocket with waste heat recoverer and combustion furnace respectively simultaneously, the moisturizing device is used for providing aqueous medium in to the steam pocket, aqueous medium and the high temperature flue gas in the combustion furnace, the flue gas after the heat transfer in the waste heat recoverer carry out the heat transfer and produce steam, steam enters into the steam pocket and collects and can heat supply or other industrial use, strengthens resource utilization, energy saving consumption;
(3) the utility model is provided with a plurality of fly ash burners, which improves the efficiency of fly ash entering the combustion furnace; meanwhile, the fly ash can be uniformly dispersed and enter the combustion furnace for combustion, the heating is uniform, and the fly ash is more fully combusted; the burner cover is arranged on the outer side of the fly ash burner, so that the service life of the fly ash burner is further ensured, the damage caused by the influence of the external environment is avoided, and the maintenance cost is reduced;
(4) the utility model is provided with the water-cooled wall on the upper part of the combustion furnace, protects the inner wall of the combustion furnace at high temperature, prolongs the service life of the combustion furnace, and simultaneously fully recovers the heat dissipation loss in the combustion furnace; and the surface of the water wall is provided with a refractory material, so that the water wall is insulated, the absorption capacity of the covered water wall pipe is reduced, the temperature in the combustion furnace is obviously increased, and the problem that the combustion furnace is easy to extinguish fire is avoided.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
In the figure: 1. an ash bin; 2. locking the bucket; 3. a combustion furnace; 4. a cyclone separator; 5. a preheater; 6. a waste heat recoverer; 7. a dust remover; 8. a gas storage device; 9. a fan; 10. a slag discharging pool; 11. a steam drum; 12. and a water replenishing device.
Detailed Description
The invention will be further described with reference to specific embodiments and drawings.
Example 1
As shown in fig. 1, a circulating fluidized bed fly ash recycling system includes an ash bin 1, and a combustion furnace 3 connected to the ash bin 1 through a lock hopper 2, wherein the lock hopper 2 is used for crushing the fly ash in the ash bin 1, so that the particle size of the fly ash is small, the fly ash is ensured to enter the combustion furnace 3 for sufficient combustion, and the combustion efficiency is further improved. The flue gas outlet on firing burning furnace 3 is connected with preheater 5 through cyclone 4, and the bottom of firing burning furnace 3 is equipped with row cinder pond 10, and specifically, fire burning furnace 3 and carry out the combustion reaction of fly ash, produce high temperature flue gas during, high temperature flue gas enters into cyclone 4 from the flue gas outlet and realizes gas-solid separation, and the solid of separation returns to firing burning furnace 3 in the cyclone 4 and carries out the repeated combustion. The residue generated by the combustion reaction in the combustion furnace 3 enters the slag discharging pool 10 at the bottom of the combustion furnace 3, the slag discharging pool 10 is used for cooling, standing and collecting the residue, the carbon content of the residue is extremely low, the particle size, the strength and other properties of the residue are greatly improved compared with those of fly ash, the residue can be periodically treated, and the residue can be directly used as roadbed filler or other purposes. Fan 9, lock fill 2 and dust remover 7 are equallyd divide and are connected with pre-heater 5, and dust remover 7 is connected with ash bin 1, and dust remover 7 can fully collect and return to and circulate burning in ash bin 1 with tiny particle in the flue gas in the pre-heater 5, reduces the dust concentration of 7 flue gas exits in the dust remover flue gas. Specifically, the preheater 5 is provided with an air inlet, a flue gas outlet and an air outlet; the air inlet is connected with a fan 9, and normal temperature air is conveyed into the preheater 5 through the fan 9; the flue gas inlet is connected with a gas outlet on the cyclone separator 4, the flue gas outlet is connected with the dust remover 7, and the air outlet is connected with the lock hopper 2. High temperature flue gas from cyclone 4 enters into in the preheater 5, high temperature flue gas and normal atmospheric temperature air carry out the mixed heat transfer, high temperature flue gas heats normal atmospheric temperature air into high temperature air, high temperature flue gas self temperature descends simultaneously, high temperature air enters into in the lock fill 2, the fly ash of high temperature air in to the lock fill 2 preheats, more be favorable to the burning of fly ash, high temperature air still regards as the carrier air of fly ash simultaneously, do not need to dispose special conveyor, when practicing thrift the cost, also make the combustion reaction more abundant, gasification efficiency is improved. The dust remover 7 further removes dust from the flue gas after heat exchange of the preheater 5, and small particle dust in the flue gas is conveyed into the ash bin 1 through a pipeline to be subjected to repeated combustion process. In the embodiment, the dust remover 7 is a bag-type dust remover, and has simple structure and stable work. Meanwhile, the dust remover 7 is connected with the gas storage device 8 to collect the dust-removed gas, so that the gas can be conveniently and intensively treated, and the gas storage device 8 is a gas storage container. The system has simple structure, can further burn a large amount of high-carbon fly ash generated in the circulating fluidized bed system, fully utilizes the residual heat value of the fly ash, generates steam, avoids resource waste, has good economic benefit, and reduces the harm of the fly ash to the environment.
The utility model discloses a fire burning furnace 3 and carry out combustion processing to the flying dust, the high temperature flue gas that will burn the production simultaneously carries out the heat transfer with the normal atmospheric temperature air, and normal atmospheric temperature air after the intensification returns to in the lock fill 2 together get into burning furnace 3 with the flying dust, and further removes dust to the flue gas after the heat transfer, and flue gas dust content is extremely low after the dust removal, can reach the emission requirement, can directly discharge or collect as protection gas and greenhouse gas, improves the economic value of whole system. The whole system can effectively change the fly ash into valuable, not only meets the requirement of environmental protection, but also achieves the purpose of saving resources and energy, has extremely high comprehensive utilization rate, and has extremely high use value and market value.
Example 2
Basically, like embodiment 1, in order to further effectively use the heat in the system, a waste heat recovery device 6 is further arranged between the preheater 5 and the dust remover 7, a flue gas inlet of the waste heat recovery device 6 is connected with a flue gas outlet on the preheater 5, and a flue gas outlet of the waste heat recovery device 6 is connected with a flue gas inlet of the dust remover 7, so as to further recycle the heat of the flue gas after heat exchange. Furthermore, the heat recovery device further comprises a steam drum 11, the combustion furnace 3 and the waste heat recoverer 6 are respectively connected with the steam drum 11, the water supplementing device 12 is connected with the steam drum 11 and is used for supplementing water into the steam drum 11, and the water supplementing device 12 can be a water tank or other container for bearing water. Specifically, the steam pocket 11 is connected with the upper part of the combustion furnace 3 through a descending pipe, the steam pocket 11 is connected with the waste heat recoverer 6 through the descending pipe, and the steam pocket 11 is connected with the water supplementing device 12, so that the steam pocket 11 provides water medium as heat exchange medium for the combustion furnace 3 and the waste heat recoverer 6, the water medium is contacted with flue gas in the combustion furnace 3 and the waste heat recoverer 6 for heat exchange to generate steam, and the steam enters the steam pocket 11 through an ascending pipe for collection and can be used for heating or other industrial purposes. Because the flue gas temperature in the combustion furnace 3 and the waste heat recoverer 6 is different, the steam pocket 11 is respectively connected with the combustion furnace 3 and the waste heat recoverer 6, so that the flue gas is cooled on the one hand, and the steam with different temperature and pressure grades can be generated on the other hand, thereby respectively supplying different downstream equipment, fully utilizing the waste heat and improving the energy utilization rate of the whole system. The system comprises the following steps:
s1: the fly ash is subjected to combustion reaction in a combustion furnace 3 to generate high-temperature flue gas, the high-temperature flue gas is subjected to heat exchange at the upper part of the combustion furnace 3 in the first step, is subjected to heat exchange with cold air through a preheater 5 in the second step, is subjected to heat exchange with water through a waste heat recoverer 6 in the third step, and finally enters a dust remover 7 for dust removal, a large amount of heat value contained in the fly ash is fully utilized through the steps, the high-temperature flue gas is also cooled to normal temperature and can reach the emission standard, the high-temperature flue gas can be directly emitted or stored to be used as greenhouse gas or protective gas, and dust is collected in the dust remover 7 and returned to an ash bin 1 for next cycle combustion;
s2: cold air enters the preheater 5 through the fan 9 to exchange heat with high-temperature flue gas, the cold air is preheated to a certain temperature, hot air enters the lock hopper 2 through a pipeline to be mixed with fly ash and then enters the combustion furnace 3 to be fully combusted, and the hot air is used as the conveying air of the fly ash and is also used as combustion-supporting air to preheat the fly ash, so that the fly ash is more conducive to being fully combusted;
s3: the water needed in the combustion furnace 3, the steam pocket 11 and the waste heat recoverer 6 is provided through the water supplementing device 12, the water supplementing device 12 continuously supplements water into the steam pocket 11 according to the operation condition, the steam pocket 11 is connected with the combustion furnace 3 and the waste heat recoverer 6 through a descending pipe to provide cold water for the combustion furnace 3 and the waste heat recoverer 6 and serve as a heat exchange medium, and steam generated by the combustion furnace 3 and the waste heat recoverer 6 enters the steam pocket 11 through an ascending pipe to be collected, so that heating or other industrial purposes can be achieved.
Example 3
Basically, like the embodiment 1, in order to further improve the gasification efficiency and prolong the service life of the equipment in the system, the combustion furnace 3 is provided with a plurality of fly ash burners, and the fly ash in the lock hopper 2 enters the combustion furnace 3 through the fly ash burners, so that the efficiency of the fly ash entering the combustion furnace 3 is improved. The plurality of fly ash burners are uniformly arranged along the circumferential direction of the combustion furnace 3, so that fly ash can uniformly disperse and enter the combustion furnace 3 to be combusted, the heating is uniform, and the fly ash is more fully combusted. And the outer side of the fly ash burner is provided with the burner cover, so that the service life of the fly ash burner is further ensured, the damage caused by the influence of the external environment is avoided, and the maintenance cost is reduced.
Specifically, in this embodiment, a water-cooled wall is arranged on the upper portion of the inner wall of the combustion furnace 3, the water-cooled wall is connected with the steam drum 11, the high-temperature flue gas generated by the combustion furnace 3 exchanges heat with the water-cooled wall in the rising process to generate steam, and the steam enters the steam drum 11, and a refractory material is arranged on the surface of the water-cooled wall, so that the water-cooled wall is insulated, the absorption capacity of the covered water-cooled wall is reduced, the temperature in the combustion furnace 3 is obviously increased, and the problem that the combustion furnace 3 is easy to extinguish is avoided. The lower part of the inner wall of the combustion furnace 3 is provided with a wear-resistant coating, so that the service life of the combustion furnace 3 is further prolonged, and the maintenance cost of equipment is reduced.
The examples of the utility model are only right the utility model discloses a preferred embodiment describes, and not right the utility model discloses design and scope are injectd, do not deviate from the utility model discloses under the prerequisite of design idea, the field engineering technical personnel are right the utility model discloses a various deformation and improvement that technical scheme made all should fall into the protection scope of the utility model.

Claims (8)

1. The utility model provides a circulating fluidized bed flying dust system of recycling, includes ash bin (1), fires burning furnace (3) with ash bin (1) is connected through lock fill (2), its characterized in that: a flue gas outlet on the combustion furnace (3) is connected with a preheater (5) through a cyclone separator (4), a slag discharging pool (10) is arranged at the bottom of the combustion furnace (3), a fan (9), a lock hopper (2) and a dust remover (7) are respectively connected with the preheater (5), and the dust remover (7) is connected with an ash bin (1).
2. The circulating fluidized bed fly ash recycling system of claim 1, wherein: a waste heat recoverer (6) is also arranged between the preheater (5) and the dust remover (7).
3. The circulating fluidized bed fly ash recycling system of claim 2, wherein: the boiler also comprises a steam drum (11), the combustion furnace (3) and the waste heat recoverer (6) are respectively connected with the steam drum (11), and the water supplementing device (12) is connected with the steam drum (11) and used for supplementing water into the steam drum (11).
4. A circulating fluidized bed fly ash recycling system according to claim 1 or 3, wherein: the lock hopper is characterized in that the combustion furnace (3) is provided with a plurality of fly ash burners, fly ash in the lock hopper (2) enters the combustion furnace (3) through the fly ash burners, and the fly ash burners are uniformly arranged along the circumferential direction of the combustion furnace (3).
5. The circulating fluidized bed fly ash recycling system of claim 4, wherein: the outer side of the fly ash burner is provided with a burner cover.
6. The circulating fluidized bed fly ash recycling system of claim 5, wherein: the upper part of the inner wall of the combustion furnace (3) is provided with a water-cooled wall which is connected with the steam drum (11); the lower part of the inner wall of the combustion furnace (3) is provided with a wear-resistant coating.
7. The circulating fluidized bed fly ash recycling system of claim 6, wherein: and the surface of the water-cooled wall is provided with a refractory material.
8. The circulating fluidized bed fly ash recycling system of claim 1, wherein: the dust remover (7) is a bag-type dust remover.
CN202120147422.7U 2021-01-19 2021-01-19 Circulating fluidized bed fly ash recycling system Active CN214332741U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115744835A (en) * 2022-07-07 2023-03-07 云南云天化环保科技有限公司 System and method for melting and decomposing phosphogypsum reducing mixture by entrained flow bed

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115744835A (en) * 2022-07-07 2023-03-07 云南云天化环保科技有限公司 System and method for melting and decomposing phosphogypsum reducing mixture by entrained flow bed

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