CN219588954U - Circulating fluidized bed garbage incineration system coupled with fire grate conveying device - Google Patents
Circulating fluidized bed garbage incineration system coupled with fire grate conveying device Download PDFInfo
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Abstract
The embodiment of the utility model provides a circulating fluidized bed garbage incineration gasification system coupled with a fire grate conveying device, wherein the fire grate conveying system is combined with a circulating fluidized bed incinerator for reconstruction of a newly built household garbage incineration boiler, the fire grate conveying system is utilized for pre-drying, heat treatment and conveying of household garbage, and the circulating fluidized bed incinerator is utilized for burning of household garbage fuel, so that the technical advantages of the fire grate conveying system in feeding and deslagging and the advantages of the circulating fluidized bed incinerator in the aspect of burning efficiency are fully combined, and stable, clean and efficient burning of the household garbage fuel is realized.
Description
Technical Field
The utility model relates to the technical field of garbage incineration, in particular to a circulating fluidized bed garbage incineration system coupled with a fire grate conveying device.
Background
The large amount of solid waste has great harm to the environment, and is mainly characterized by occupying land, polluting the atmosphere, soil and water, and the damage caused by the large amount of solid waste is difficult to recover, the existing municipal solid waste treatment technology has low level, the municipal solid waste treatment needs a large amount of funds, the environmental pollution is serious, and the like, and the large amount of solid waste has become an important bottleneck for affecting the urban living environment of China and restricting the urban development. At present, three methods of landfill, composting and incineration are basically adopted in the aspect of solving urban household garbage, and compared with the landfill and the composting, the incineration method has the characteristics of capacity reduction, weight reduction, on-site treatment, high treatment speed, heat energy recovery, high harmless degree and the like, so that the household garbage incineration power generation is an important way for developing new energy and disposing the household garbage.
At present, household garbage incineration technologies mainly comprise a movable grate incineration technology, a circulating fluidized bed incinerator technology and a rotary kiln incineration technology. The rotary furnace equipment has high sealing requirement, high cost and high price, and is mainly applied to the incineration of medical household garbage or the incineration of dangerous wastes. The grate furnace has the greatest advantages of stable and reliable operation, less fly ash, and most of solid household garbage can be directly fed into the furnace for combustion without any pretreatment. However, the following problems still remain: the investment cost of the equipment is high, and the occupied area is large; the temperature distribution and combustion of the fire grate and the upper furnace are unstable and uneven, the burnout rate is low, and the original emission concentration of pollutants such as NOx is too high; the tail flue gas environmental protection equipment is complex and has high operation cost.
The circulating fluidized bed household garbage boiler has strong fuel type adaptability, and the dense-phase area has a large amount of high-temperature materials, so the combustion efficiency is high. Meanwhile, the low-temperature staged combustion mode is adopted, so that the NOx generation amount is small. In the aspect of environmental protection, the SNCR denitration process in the high-efficiency furnace and the dry desulfurization and deacidification process in the furnace are adopted, and the system is simple and reliable. With the further improvement of the conventional pollutant index of the household garbage incineration plant, compared with a grate furnace, the circulating fluidized bed household garbage boiler has the advantages of NOx and SO 2 And the investment and running cost of removing pollutants such as HCl and the like. However, the existing circulating fluidized bed household garbage boiler generally has the problems of unstable feeding and burning, large fly ash amount, high maintenance frequency and the like. How to solve the problem of stable feeding and deslagging of the fluidized bed household garbage boiler and further give play to the advantages of combustion efficiency and environmental protection, and becomes the research and development focus of the next stage.
In the prior art, CN109185892A discloses a circulating fluidized bed household garbage boiler structure, in which an intermediate flue is arranged between a flue gas outlet of a separator and a tail flue, and the system is beneficial to CO combustion. Meanwhile, the secondary conveying system improves feeding stability, but the whole feeding system is still limited by complicated and changeable household garbage fuels. CN209458953U discloses a fluidized bed household garbage incinerator, which comprises a household garbage incinerator consisting of a hearth, a wind distribution device, a separator, a self-balancing feed back valve, a central cylinder, a tail flue, a high temperature superheater, a low temperature superheater, an economizer and an air preheater, but how to solve the problem of feed stability is not fully described, and in view of this, a person skilled in the art needs to provide a novel garbage incineration gasification system.
Disclosure of Invention
Aiming at the prior art, at least one technical problem is solved, and the embodiment of the utility model provides a circulating fluidized bed garbage incineration gasification system coupled with a fire grate conveying device, wherein the fire grate conveying system is combined with a circulating fluidized bed incinerator for reconstruction of a newly built household garbage incineration boiler, the fire grate conveying system is utilized for pre-drying, heat treatment and conveying of household garbage, and the circulating fluidized bed incinerator is utilized for burning of household garbage fuel, so that the technical advantages of the fire grate conveying system in feeding and deslagging and the advantages of the circulating fluidized bed incinerator in the aspect of burning efficiency are fully combined, and stable, clean and efficient burning of the household garbage fuel is realized.
The embodiment of the utility model provides a circulating fluidized bed garbage incineration and gasification system coupled with a fire grate conveying device, which comprises
The fire grate conveying device comprises a garbage conveying part and a pretreatment part; the garbage conveying piece is used for pushing garbage to be incinerated step by step and conveying the garbage to the incineration and gasification device; the pretreatment piece is used for conveying hot air to a plurality of parts of the garbage conveying piece, and drying garbage to be incinerated and converting the garbage into granular fuel in the step pushing process; and
the incineration gasification device comprises a fluidized bed boiler; the fluidized bed boiler is connected with the output end of the garbage conveying part; the pretreatment piece is connected with the input end of the air distribution device, and the output end of the air distribution device is communicated with the fluidized bed boiler.
In some embodiments, the incineration gasification device further comprises a flue gas purification device and an external bed heat exchanger; the input end of the flue gas purification device is connected with the horizontal flue of the fluidized bed boiler, and the output end of the flue gas purification device is connected with the input end of the external bed heat exchanger; and the output end of the external bed heat exchanger is connected with the garbage conveying part.
In some embodiments, the waste transport member includes a drying section and a pre-combustion section; wherein the drying section is located upstream of the pre-combustion section, depending on the direction of transport of the refuse to be incinerated.
In some embodiments, the garbage conveying members are respectively arranged at two sides of the incineration and gasification device, and are used for conveying the granular fuel through two sides of a hearth in the fluidized bed boiler.
In some embodiments, the air distribution device is located in a lower portion of a furnace in the fluidized bed boiler.
In some embodiments, the flue gas cleaning device comprises a separator, wherein the separator is at least two horizontal flues respectively symmetrically arranged at two sides of the fluidized bed boiler; the solid output ends of the separators are respectively connected with the external bed heat exchangers in a one-to-one correspondence manner; and the gas output ends of the separators are communicated with the outlet flue.
In some embodiments, a slag discharge port is arranged at the bottom of a hearth in the fluidized bed boiler; the slag discharging port is positioned at one side of the air distribution device.
In some embodiments, a return pipe is arranged between the external bed heat exchanger and the pre-combustion section, and the solid particles separated and trapped by the flue gas purification device are conveyed to the pre-combustion section through the return pipe after passing through the external bed heat exchanger.
In some embodiments, the pre-treatment comprises a fan and a hot air duct; the fan generates hot air and conveys the hot air through the hot air pipeline with a one-inlet-multi-outlet structure; the hot air pipeline is communicated with the air distribution device.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.
Drawings
The foregoing and/or additional aspects and advantages of the utility model will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic diagram of a circulating fluidized bed refuse incineration and gasification system coupled to a grate conveying device according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram of the operation of the incineration gasification system of FIG. 1;
in the figure, 1, a drying section; 2. a blower; 3. a hot air duct; 4. a fluidized bed boiler; 5. an air distribution device; 6. a pre-combustion section; 7. a separator; 8. a horizontal flue; 9. an external bed heat exchanger; 10. a slag discharge port; 11. and (5) a return pipe.
Detailed Description
In order to make the present utility model better understood by those skilled in the art, the following description will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments, but not intended to limit the scope of the present disclosure. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.
In the accompanying drawings, there is shown a schematic structural diagram in accordance with a disclosed embodiment of the utility model. The figures are not drawn to scale, wherein certain details are exaggerated for clarity of presentation and may have been omitted. The shapes of the various regions, layers and their relative sizes, positional relationships shown in the drawings are merely exemplary, may in practice deviate due to manufacturing tolerances or technical limitations, and one skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions as actually required.
The embodiment of the utility model is described below with reference to fig. 1, and specifically, the embodiment of the utility model provides a circulating fluidized bed garbage incineration and gasification system coupled with a fire grate conveying device, which comprises the fire grate conveying device and the incineration and gasification device; wherein the method comprises the steps of
The fire grate conveying device comprises a garbage conveying piece and a pretreatment piece; the garbage conveying piece is used for pushing garbage to be incinerated step by step and conveying the garbage to the incineration and gasification device; the pretreatment piece comprises a fan 2 and a hot air pipeline 3; the waste to be incinerated is dried and converted into a granular fuel in the step pushing process after hot air is generated by a fan 2 and is conveyed to a waste conveying piece through a hot air pipeline 3;
specifically, the pretreatment piece includes fan 2 and hot air pipe 3, and wherein hot air is the hot air that produces by primary fan 2, and hot air lets in a plurality of positions of rubbish transport piece respectively through hot air pipe 3, carries out drying and precombustion to rubbish that the step pushing of rubbish transport piece was waited to burn, and wherein it is known that hot air pipe 3 includes the trunk line that communicates with primary fan 2 and a plurality of lateral conduit that communicate with the trunk line respectively, for a business turn over many structures, and a plurality of lateral conduit carry hot air to the different positions of rubbish transport piece respectively, realize the pretreatment of treating the rubbish that burns.
As shown in fig. 1, the waste conveyor comprises a drying section 1 and a pre-combustion section 6, wherein the drying section 1 is located upstream of the pre-combustion section 6, depending on the direction of transport of the waste to be incinerated. Namely, the household garbage to be incinerated is taken as an example, the household garbage is sent into a garbage conveying member by a grab bucket, the household garbage firstly passes through a drying section 1 and then passes through a pre-combustion section 6 under the reciprocating pushing action of the garbage conveying member, wherein hot air is respectively introduced into the drying section 1 and the pre-combustion section 6 through a branch pipeline, the household garbage to be incinerated is dried in the drying section 1 by controlling the flow of the hot air, the dried household garbage to be incinerated enters the pre-combustion section 6 under the action of step pushing, and the hot air converts the irregular multi-element household garbage into granular matters (namely granular fuels or black particles) with certain combustible substances, and the granular fuels are output to an incineration gasification device by the pre-combustion section 6.
In some embodiments, as shown in fig. 1, the waste transporting members are provided on both sides of the incineration gasification device, respectively, and the granular fuel is fed through both sides of the furnace in the fluidized bed boiler 4. In other words, garbage conveying members can be respectively arranged at two sides of the incineration and gasification device, and household garbage is pretreated from the garbage conveying members at two sides to generate granular fuel, and the granular fuel is finally sent into the incineration and gasification device from two sides of the incineration and gasification device under the action of the garbage conveying members, so that continuous feeding in the incineration and gasification device and sufficient pretreatment of the household garbage to be incinerated are ensured.
The incineration and gasification apparatus in the present embodiment includes a fluidized bed boiler 4; the fluidized bed boiler 4 is connected with the output end of the garbage conveying part, and the granular fuel is fluidized and combusted in the hearth under the action of the air distribution device 5; wherein the hot air pipeline 3 is communicated with the air distribution device 5.
Specifically, the incineration and gasification device comprises a fluidized bed boiler 4, the fluidized bed boiler 4 comprises a hearth which is used for combustion and extends along the vertical direction, and a horizontal flue 8, the upper end of which is connected with the hearth and is positioned on at least one side of the hearth, hot air is introduced into the air distribution device 5, the fluidized bed boiler 4 is connected with the output end of the garbage conveying piece so as to enter the hearth of the fluidized bed boiler 4, and granular fuel in the hearth is subjected to fluidized combustion in the hearth under the action of the air distribution device 5. The preferred air distribution device 5 is located in the fluidized bed boiler 4 in the lower part of the furnace.
The fluidized bed boiler 4 in the prior art is easy to cause unstable combustion due to unstable feeding, and further the CO emission is too high; in the embodiment, the advantage of the fire grate conveying device on the feeding system is utilized, the fire grate conveying device is utilized to realize stepped continuous feeding of the garbage to be combusted, and the drying section 1 and the pre-combustion section 6 are respectively used for drying and pre-combustion treatment in different conveying and feeding processes, so that the garbage to be combusted is converted into a substance form which is more suitable for combustion in the hearth of the fluidized bed boiler 4, and the overall operation stability of combustion in the hearth is improved. Meanwhile, the granular fuel in the hearth realizes fluidized combustion in the hearth under the action of the air distribution device 5, so that the shutdown time of the granular fuel is greatly prolonged, the full combustion of the fuel is facilitated, and the boiler efficiency is improved. In addition, the fluidized bed boiler 4 can maintain higher temperature and more uniform temperature distribution of the whole hearth due to high-concentration material circulation, stronger turbulence and higher excess air coefficient, thereby being more beneficial to the decomposition of dioxin and precursors thereof.
In some embodiments, the bottom of the furnace in the fluidized bed boiler 4 is provided with a slag discharge port 10, wherein the slag discharge port 10 is positioned at one side of the air distribution device 5, and slag is in double functions of transportation and fluidization, so that slag discharge stability is better compared with the fluidized bed boiler 4 in the prior art.
In some embodiments, the incineration gasification device further comprises a flue gas cleaning device; the flue gas generated after the granular fuel is combusted in the hearth of the fluidized bed boiler 4 enters the flue gas purifying device through the horizontal flue 8. The dust-containing flue gas generated after the granular fuel is combusted moves to the upper part of the hearth along the hearth, and at the moment, partial particles in the dust-containing flue gas touch the top of the flue and fall into the bottom of the hearth again for combustion, so that the primary screening of the particles in the flue gas is realized; the particles entering the horizontal flue 8 along with the flue gas pass through the flue gas purification device, the flue gas purification device further carries out gas-solid separation on the flue gas, the separated solid particles are conveyed to a garbage conveying part after passing through the external bed heat exchanger 9, and the separated gas is directly introduced into an outlet flue for discharge, so that the secondary purification of the flue gas is completed. The external bed heat exchanger 9 in the embodiment is a high-temperature superheater arranged in the external bed.
As shown in fig. 1, horizontal flues 8 are symmetrically arranged on the upper parts of two sides of a hearth in the fluidized bed boiler 4 respectively, wherein the horizontal flues 8 on the two sides are communicated with the hearth, dust-containing flue gas generated after granular fuel is combusted in the hearth of the fluidized bed boiler 4 moves above the hearth along the hearth until the top of the horizontal flue 8, and at the moment, part of particles in the flue gas touch the top of the flue and fall into the bottom of the hearth again for combustion, so that the primary screening of the particles in the dust-containing flue gas is realized; and the flue gas after preliminary dust removal respectively enters a horizontal flue 8 on the left side and a horizontal flue 8 on the right side of the hearth. Wherein the flue gas purification device comprises a separator 7, wherein the separator 7 is at least two horizontal flues 8 which are respectively and symmetrically arranged on the two sides of the horizontal flues 8 of the fluidized bed boiler 4, namely, the left horizontal flues 8 and the right horizontal flues 8 are respectively provided with the separator 7, and the entered flue gas is respectively subjected to gas-solid separation and purification. The solid output ends of the separators 7 in the horizontal flue 8 on the left side and the horizontal flue 8 on the right side are respectively connected with an external bed heat exchanger 9, and separated solid particles are respectively conveyed to the garbage conveying piece after passing through the external bed heat exchangers 9 on the two sides; and the separated flue gas is converged and then is discharged through an outlet flue.
In this embodiment, after the dust-containing flue gas is separated and purified by the flue gas purification device, the separated solid particles are respectively conveyed to the garbage conveying part through the external bed heat exchangers 9 on two sides and returned to the fire grate conveying device, so that the heating of the household garbage to be combusted can be realized, and then the household garbage enters the hearth again for combustion, the heating and combustion supporting effects of the household garbage fuel are further realized, the furnace stopping time of the fuel is greatly prolonged when the flue gas purification device captures large particles, the full combustion of the fuel is facilitated, and the efficiency of the fluidized bed boiler 4 is improved. In addition, the external bed heat exchanger 9 in the embodiment realizes the circulation and heat exchange of materials, avoids the contact of the high-temperature steam pipeline and the gas or small particles which are easy to corrode and coke in the flue gas, and solves the problems of coking and corrosion of the high-temperature steam pipeline.
In some embodiments, the solid particles separated and trapped by the flue gas cleaning device are conveyed to the pre-combustion section 6 through the return pipe 11 after passing through the external bed heat exchanger 9.
Specifically, as shown in fig. 1, solid particles separated and trapped by the flue gas purification device can be conveyed to the pre-combustion section 6 through the return pipe 11 after passing through the external bed heat exchanger 9, so that the heating and combustion supporting effects on the household garbage fuel are further realized.
As shown in FIG. 2, the operation principle of the incineration gasification system in any of the above embodiments will be described, including
In the process of pushing garbage to be incinerated in steps by utilizing the pretreatment piece, the heated hot air dries the garbage to be incinerated in the drying section 1 and burns the garbage to be incinerated in the pre-burning section 6 to form granular fuel;
the granular fuel is input into a hearth of the fluidized bed boiler 4, and heated hot air is subjected to fluidization combustion at 950-1000 ℃ in the hearth through an air distribution device 5; the combustion flue gas enters a flue gas purifying device; the solid particles separated and trapped by the flue gas purification device are conveyed to the pre-combustion section 6 after passing through the external bed heat exchanger 9; the purified flue gas is output to an outlet flue, and slag is discharged from a slag discharge port 10.
Specifically, the hot air generated by the primary fan 2 is respectively conveyed to the drying section 1, the pre-combustion section 6 and the air distribution device 5 through the hot air pipeline 3 and a plurality of branch pipelines respectively communicated with the main pipeline, and different air quantity control is realized. The household garbage to be incinerated is sent into garbage conveying parts at two sides of a hearth by a household garbage fuel grab bucket, and the household garbage is firstly subjected to a drying section 1 and then to a pre-combustion section 6 under the reciprocating pushing action to convert the irregular multi-element household garbage into granular matters with certain combustible matters; the granular fuel is output to the hearth of the fluidized bed boiler 4 by the pre-combustion section 6, and the granular fuel in the hearth realizes fluidized combustion in the hearth under the action of the air distribution device 5. Dust-containing flue gas generated after granular fuel is combusted in a hearth of the fluidized bed boiler 4 moves to the upper part of the hearth along the hearth, and at the moment, part of particles in the flue gas touch the top of a flue and fall into the bottom of the hearth again for combustion; the particles entering the horizontal flue 8 along with the flue gas pass through the flue gas purification device, the flue gas purification device carries out gas-solid separation on the flue gas, the separated solid particles are conveyed to the garbage conveying part after passing through the external bed heat exchanger 9, and the separated gas is directly introduced into the outlet flue for discharge, so that the secondary purification of the flue gas is completed. Slag is discharged from a slag discharge port 10 at the bottom of the hearth.
The uniformity of the overall furnace temperature and residence time of the fluidized bed boiler 4 in this embodiment are critical for the formation of dioxins. Among them, dioxin (PCDD/Fs) is known to be formed by two mechanisms: one of the mechanisms of formation is homogeneous reaction at a temperature in the range of 500-800 c, with the main process being the rearrangement reaction gases of chlorinated precursors, such as Chlorophenol (CP) and chlorobenzene (CBz), and the PCDD/Fs in this process are known as homogeneous PCDD/Fs or high temperature PCDD/Fs. PCDD/Fs can also be formed by heterogeneous reactions at temperatures ranging from 200 to 400 ℃. The other forming mechanism is that heterogeneous reaction is mainly formed by CP, CBz or carbon in the fly ash under the catalysis of the fly ash, namely, the source is generated.
In this embodiment, the combustion mode of the fluidized bed boiler 4 is that the fluidized bed boiler is in combustion and conducts heat and mass transfer by means of high-concentration materials, so that the furnace temperature is stronger in adjustability, better in overall uniformity, and easy to obtain higher temperature, and further, the decomposition of dioxin and precursors thereof is more facilitated.
In some embodiments, the residence time of the particulate fuel in the waste transport member is from 1 to 1.5 seconds.
In the embodiment, the garbage to be incinerated is dried and pre-combusted by adopting the grate conveying device, and the generated granular fuel can fully and stably realize fluidized combustion in the hearth of the fluidized bed boiler 4, so that the temperature uniformity of the hearth is ensured; meanwhile, the uniform high-temperature environment and the longer residence time in the fluidized bed boiler 4 can ensure the decomposition of dioxin and precursors thereof, and the standard emission of dioxin under different loads of household garbage incineration is realized on the premise of not adding a tail activated carbon adsorption device.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.
Claims (9)
1. The circulating fluidized bed garbage incineration and gasification system coupled with the fire grate conveying device is characterized by comprising
The fire grate conveying device comprises a garbage conveying part and a pretreatment part; the garbage conveying piece is used for pushing garbage to be incinerated step by step and conveying the garbage to the incineration and gasification device; the pretreatment piece is used for conveying hot air to a plurality of parts of the garbage conveying piece, and drying garbage to be incinerated and converting the garbage into granular fuel in the step pushing process; and
the incineration gasification device comprises a fluidized bed boiler; the fluidized bed boiler is connected with the output end of the garbage conveying part; the pretreatment piece is connected with the input end of the air distribution device, and the output end of the air distribution device is communicated with the fluidized bed boiler.
2. The circulating fluidized bed garbage incineration and gasification system coupled with the fire grate conveying device according to claim 1, wherein the incineration and gasification device further comprises a flue gas purification device and an external bed heat exchanger; the input end of the flue gas purification device is connected with the horizontal flue of the fluidized bed boiler, and the output end of the flue gas purification device is connected with the input end of the external bed heat exchanger; and the output end of the external bed heat exchanger is connected with the garbage conveying part.
3. The circulating fluidized bed waste incineration gasification system coupled to a grate transfer device according to claim 2, wherein the waste transfer member comprises a drying section and a pre-combustion section; wherein the drying section is located upstream of the pre-combustion section, depending on the direction of transport of the refuse to be incinerated.
4. The circulating fluidized bed refuse incineration and gasification system coupled with a fire grate conveying device according to claim 2, wherein the refuse conveying members are respectively arranged at two sides of the incineration and gasification device for conveying the granular fuel through two sides of a hearth in the fluidized bed boiler.
5. The circulating fluidized bed waste incineration gasification system coupled with the fire grate conveying device according to claim 2, wherein the air distribution device is positioned at the lower part of a hearth in the fluidized bed boiler.
6. The circulating fluidized bed garbage incineration and gasification system coupled with a fire grate conveying device according to any one of claims 2 to 5, wherein the flue gas purifying device comprises at least two separators which are symmetrically arranged at two sides of a horizontal flue of the fluidized bed boiler respectively; the solid output ends of the separators are respectively connected with the external bed heat exchangers in a one-to-one correspondence manner; and the gas output ends of the separators are communicated with the outlet flue.
7. The circulating fluidized bed garbage incineration and gasification system coupled with the fire grate conveying device according to claim 6, wherein a slag discharge port is arranged at the bottom of a hearth in the fluidized bed boiler; the slag discharging port is positioned at one side of the air distribution device.
8. A circulating fluidized bed garbage incineration and gasification system coupled with a fire grate conveying device according to claim 3, wherein a return pipe is arranged between the external bed heat exchanger and the pre-combustion section, and solid particles separated and trapped by the flue gas purifying device pass through the external bed heat exchanger and are conveyed to the pre-combustion section through the return pipe.
9. The circulating fluidized bed waste incineration gasification system coupled to a grate transfer device according to claim 6, wherein the pretreatment piece comprises a fan and a hot air duct; the fan generates hot air and conveys the hot air through the hot air pipeline with a one-inlet-multi-outlet structure; the hot air pipeline is communicated with the air distribution device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222985790.6U CN219588954U (en) | 2022-11-09 | 2022-11-09 | Circulating fluidized bed garbage incineration system coupled with fire grate conveying device |
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| CN202222985790.6U CN219588954U (en) | 2022-11-09 | 2022-11-09 | Circulating fluidized bed garbage incineration system coupled with fire grate conveying device |
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