CN210441220U - CFB boiler coal-fired coupling processing line to combustible solid waste - Google Patents

Abstract

The utility model provides a CFB boiler coal-fired coupling processing line to combustible solid useless, mainly includes resource processing system, independent pneumatic conveying system, stable combustion system and gas cleaning system, independent pneumatic conveying system includes negative pressure fan group, supply-air duct, conveying pipeline and feed mechanism, stable combustion system includes boiler, fuel and goes into boiler tube, primary air pipe, secondary air pipe and primary air chamber, the secondary air pipe is including connecting on the lateral wall of boiler and the branch divide in the fuel goes into last secondary air pipe and the lower secondary air pipe of on the horizontal plane of boiler tube place, below. The utility model discloses the suitability in the solid useless field of handling is wider, and is high-efficient practical, effectively reduces and restraines the generation of dioxin, effectively reduces the emission of flue gas, smoke and dust, sulfur dioxide, nitrogen oxide, mercury and compound, effectively reduces coal-fired volume, energy-concerving and environment-protective.

Description

CFB boiler coal-fired coupling processing line to combustible solid waste

Technical Field

The utility model relates to a solid useless and living beings regeneration and utilization technical field specifically are a coal-fired coupling processing line of CFB boiler to combustible solid useless.

Background

With the coming of the policy of encouraging the general solid waste and biomass coupled coal-fired power generation in China, the general combustible solid waste becomes the best disposal direction for the coupled combustion of the coal-fired of the thermal (power generation) power plant. The general solid waste fuel (called as RDF-5, SRF), i.e. the fuel produced by sorting, screening, drying, crushing or further compression molding the combustible general solid waste, is clean, homogeneous, high quality and high calorific value fuel. The crushed bulk materials are directly used as fuel or are put into a punching forming machine to be made into fuel rods, and the fuel rods are put into a CFB boiler to be mixed and combusted with coal, so that the fuel rods are used for replacing the coal in a thermal (power generation) power plant.

At present, only a few thermal (power generation) power plants in China have application cases of conveying industrial solid wastes into CFB boilers and coal co-combustion, but the problems of low co-combustion proportion, poor material applicability, unstable combustion, low burnout degree, large modification range of boilers, difficult control of organized dioxin emission indexes and the like exist. The flue gas coupling system and the process for burning the household garbage, disclosed in the patent document with the application number of 2018106072389, comprise a burning furnace, a high-temperature dust remover, an induced draft fan, a coal-fired boiler of a coal-fired power plant and a flue gas purification system of the coal-fired power plant; the flue gas outlet of the incinerator is communicated with the flue gas inlet of the high-temperature dust remover, the flue gas outlet of the high-temperature dust remover is communicated with the flue gas inlet of the draught fan, the flue gas outlet of the draught fan is communicated with the flue gas inlet of the coal-fired boiler, the flue gas outlet of the coal-fired boiler is communicated with the flue gas purification system of the coal-fired power plant, the scheme is not improved practically, and the problems still exist.

Disclosure of Invention

One of the technical purposes of the utility model is to provide a to the coal-fired coupling treatment process of combustible solid useless CFB boiler, solve the mixed combustion proportion that exists among the prior art low, the material suitability is poor, the burning is unstable, the degree of burning out is low, the difficult problem of control of emission index.

The specific technical scheme of the treatment process is as follows: a CFB boiler coal-fired coupling treatment process aiming at combustible solid waste comprises

① resource processing, namely crushing combustible solid waste raw materials to obtain SRF bulk materials at the first stage, crushing the SRF bulk materials at the second stage, and punching the SRF bulk materials to obtain RDF-5 bulk materials with adjustable density, wherein the bulk materials are used as coupling fuels;

② pneumatic conveying, wherein the negative pressure fan is used as power source, the pipeline is used as conveying path, the pipeline is communicated with the feeding chamber, and the coupling fuel is fed into the pipeline and blown into the boiler by wind power;

③ the boiler is burned, wherein the fuel enters the dense phase region of the hearth from several positions of the boiler wall through the declination channel to burn, the boiler wall is provided with an upper secondary air path and a lower secondary air path which are respectively positioned above and below the horizontal plane of the declination channel, and the bottom of the boiler is provided with a primary air path;

④ flue gas emission, wherein the flue gas is purified by a denitration system, a dedusting system and a desulfurization system;

in step ③, the air flow of the upper secondary air duct is blown downward and at least blown through the outlet of the downward inclined channel, and the primary air volume or the secondary air volume accounts for 45-55% of the total air volume of the upper secondary air duct and the lower inclined channel.

At step ③, bed material is maintained in equilibrium by adding slag and/or sludge to replenish the bed material in the boiler when the bed material thickness is equal to or less than a minimum calibrated value.

The traditional material conveying mode is that the boiler is conveyed to a long distance through a conveying belt, then the material is fed into the boiler to be combusted in a spiral feeding or elephant trunk feeding mode, and the problems that the material is easy to leak, the dust pollution is caused, the potential safety hazard is caused, the occupied space is large and the like exist in the long distance conveying mode, and the dioxin generated in the traditional mode is always high, and the material inlet is also easy to coke and block. In long-term work, the applicant designs a pneumatic conveying scheme through thinking and practice, realizes high-efficiency, safe, pollution-free and leakage-free material conveying, and the field arrangement of the mode is relatively flexible and does not occupy too much space; the discovery that the problem that the dioxin cannot be effectively decomposed because the fuel is discharged with the air flow without being fully combusted when entering the furnace and is easily secondarily combusted in a flue and cannot be rapidly cooled down to generate a large amount of dioxin is mainly solved in the conventional solid waste treatment line is not clearly recognized, so that the applicant designs a matched stable combustion scheme, improves the conventional primary and secondary air paths, arranges an upper secondary air path and a lower secondary air path, ensures that the material sprayed from a downward inclined channel can be fully combusted under the condition of sufficient oxygen-enriched combustion, reduces the generation of the dioxin, ensures that the material and the fire coal are mixed, fluidized and disturbed by matching with the air flow, and particularly ensures that the upper secondary air path can be blown from top to bottom and deflected to the middle part, the light solid waste fuel in the hearth can be pressed, the combustion time is prolonged, the light solid waste fuel is fully combusted, the bulk material just entering the furnace is prevented from fully rising to an outlet at the upper part of the boiler without being combusted, meanwhile, the material port of the downward inclination channel for feeding is cooled, and the material port is not easy to coke and block.

One of the technical objects of the present invention is to provide a coupling treatment line for the coal burning of a CFB boiler, which is combustible and solid waste, so as to realize the above treatment process in a matching manner, and make a detailed description on the specific setting, thereby solving the problems existing in the prior art mentioned above.

The specific technical scheme of the treatment line is as follows: a CFB boiler coal-fired coupling processing line for combustible solid waste comprises a resource processing system, a flue gas purification system, an independent pneumatic conveying system and a stable combustion system, wherein the independent pneumatic conveying system is used for conveying the processed solid waste to the stable combustion system; the independent pneumatic conveying system comprises a negative pressure fan set, an air supply pipeline, a material conveying pipeline and a feeding mechanism, wherein the negative pressure fan set is communicated with the air supply pipeline, and the feeding mechanism is connected between the air supply pipeline and the material conveying pipeline and is communicated with the two pipelines; the stable combustion system comprises a boiler, a fuel inlet furnace tube, a primary air tube, a secondary air tube and a primary air chamber, wherein one end of the fuel inlet furnace tube is communicated with a conveying pipeline, the other end of the fuel inlet furnace tube is connected to the side wall of the boiler, the primary air chamber is arranged at the bottom of the boiler and communicated with a hearth of the boiler through an air outlet part, the primary air tube is communicated with the primary air chamber, the secondary air tube is connected to the side wall of the boiler and is respectively positioned on the upper secondary air tube and the lower secondary air tube above and below the horizontal plane of the fuel inlet furnace tube, and the upper secondary air tube is downwards inclined to be arranged so that air flowing out of the upper secondary air tube at least blows through the fuel inlet furnace tube opening.

Preferably, the air output of the primary air pipe or the air output of the secondary air pipe accounts for 45-55% of the total air output of the primary air pipe and the secondary air pipe. The optimal air volume ratio is that the air volume of the primary air duct and the air volume of the secondary air duct respectively account for 50 percent (actually, the tolerance of +/-5 percent is allowed).

Preferably, the feeding mechanism comprises a hopper, a feeding transfer chamber and a gas-material mixing chamber, the upper part of the feeding transfer chamber is communicated with the hopper, the lower part of the feeding transfer chamber is communicated with the gas-material mixing chamber, and two ends of the gas-material mixing chamber are respectively communicated with the air supply pipeline and the material conveying pipeline.

Preferably, a rotating shaft is arranged in the feeding transfer chamber, a plurality of rotating blades are connected to the rotating shaft, and the rotating blades extend into the gas-material mixing chamber.

Preferably, the feeding transfer chamber and the gas-material mixing chamber are cylinders with parallel axes, the side surface of the feeding transfer chamber is overlapped with the side surface of the gas-material mixing chamber, a material passing port communicated with the feeding transfer chamber is arranged on the overlapped part, and the rotating blade extends into the gas-material mixing chamber through the material passing port.

Preferably, the rotor blade is a flat plate.

Preferably, the fuel inlet pipe is obliquely inserted into a sidewall of the boiler to form a downward inclination angle with the sidewall of the boiler.

Preferably, the angle range of the downward inclination angle is 35-50 degrees.

Preferably, the internal position of the boiler corresponding to the outlet of the fuel inlet furnace tube is at the dense-phase zone or the dense-dilute intersection of the hearth.

The technical advantages of the utility model reside in that the coal-fired coupling of boiler is handled the line and is set up easily, excellent effect, mainly embodies in following several aspects:

1. applicability of the present technique: the utility model can reach 50% and above for the solid waste coupling ratio of various types and sizes, basically reaches the full coverage level for the variety and size of the general combustible solid waste, does not need to increase the secondary combustion chamber, greatly exceeds the current domestic similar treatment level, and is worth popularizing and using in the field;

2. the technology has the following steps: the emission of dioxin after multi-variety and multi-size solid waste coupling fuel is lower than the international (European Union) emission standard, and the emission is greatly reduced when the fuel is mixed and burned compared with that when the fuel is not mixed and burned;

3. the technology has ultralow thermoelectric emission: emission is further reduced on the basis of executing the ultralow emission standard of the coal-electric machine set, and the emission of smoke, smoke dust, sulfur dioxide, nitrogen oxides, mercury and compounds is effectively reduced;

4. the energy-saving benefit of the technology is as follows: effectively reduces the coal burning quantity, and is efficient and energy-saving.

Drawings

Fig. 1 is a schematic overall structure diagram of an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of an independent pneumatic conveying system according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a feeding mechanism according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a feeding mechanism according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a feeding mechanism according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a stable combustion system according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of a stable combustion system according to an embodiment of the present invention;

the names of the parts corresponding to the numbers in the drawing are respectively a 1-negative pressure fan set, a 2-air supply pipeline, a 3-material conveying pipeline, a 4-hopper, a 41-air outlet, a 5-feeding transfer chamber, a 51-rotating shaft, a 52-rotating blade, a 6-gas-material mixing chamber, a 61-discharge outlet, b 1-boiler, b 2-fuel inlet furnace pipe, b 3-primary air pipe, b 4-secondary air pipe, b 41-upper secondary air pipe, b 42-lower secondary air pipe, b 5-primary air chamber and α -lower inclination angle.

Detailed Description

The invention will be further explained by means of specific embodiments with reference to the drawings, in which:

the embodiment mainly describes a CFB boiler coal-fired coupling treatment process and a treatment line aiming at combustible solid waste, wherein the solid waste is collected, classified, primarily selected and packaged from a transfer station, then transferred to a treatment center, crushed, sorted and crushed by a resource processing system to obtain coupling fuel, then the coupling fuel is conveyed to a stable combustion system by an independent pneumatic conveying system, and finally the coupling fuel is discharged after reaching the standard through a flue gas purification system. The coupling fuel is processed by SRF and RDF-5, wherein the combustible solid waste raw material is crushed into bulk materials with the size of 600mm and below (the size generally refers to the length because the material is generally regarded as a sheet, a block or a rod), and the bulk materials obtained by the combustible solid waste raw material are crushed into bulk materials with the size of below 40mm (the size generally refers to the length because the material is generally regarded as a sheet, a block or a rod) by a secondary crusher, and then the bulk materials are processed into the formed coupling fuel with adjustable density by a punching machine.

In the prior art, a resource processing system and a flue gas purification system are both mature and applied. Resourceful processing system mainly includes conveyer belt, one-level breaker and second grade breaker, is equipped with sorter and manual work and selects separately the edulcoration, and flue gas purification system mainly includes dust removal facility, desulfurization facility, denitration facility, and modes such as conventional management reasonable sequencing, a plurality of repeated settings are connected after the boiler for accomplish flue gas purification emission process, do not have here and give unnecessary details.

Referring to fig. 1 to 5, the independent pneumatic conveying system comprises a negative pressure fan set a1, an air supply pipeline a2, a material conveying pipeline a3 and a feeding mechanism, wherein the negative pressure fan set a1 is communicated with the air supply pipeline a2, and the feeding mechanism is connected between the air supply pipeline a2 and the material conveying pipeline a3 and communicated with the two pipelines. In the figure, an iron remover, an air separator, a homogenizer, a material stirring machine, a conveying belt horizontally arranged between the iron remover, the air separator, the homogenizer and the conveying belt and leading to a hopper a4 are further sequentially illustrated on the left side of the block diagram where the hopper a4 is located, a negative pressure system is connected between the iron remover, the air separator, the homogenizer and a negative pressure fan unit a1, and a dust remover connected with an air outlet a41 of the hopper a4 is further illustrated on the right side of the block diagram where the hopper a4 is located. The negative pressure fan set a1 is composed of a plurality of high pressure centrifugal fans, and each high pressure centrifugal fan is correspondingly connected with an air supply pipeline a2 and a feeding mechanism. A fan full pressure range for a stove is usually at 10~80kpa, and the amount of wind range is 5000~20000m cultivation/h, and the internal diameter size of pipeline can be adjusted according to actual conditions. Specifically, the feeding mechanism comprises a hopper a4, a feeding transfer chamber a5 and a gas mixing chamber a6, the hopper a4 adopts a micro-positive pressure hopper, and the coupling fuel is conveyed into the hopper a4 by a conveying belt, as shown in fig. 2, 3, 4 and 5. The upper part of the feeding transfer chamber a5 is communicated with the bottom of the hopper a 4; the feeding transfer chamber a5 and the gas-material mixing chamber a6 are cylinders with parallel axes, the lower side surface of the feeding transfer chamber a5 is overlapped with the upper side surface of the gas-material mixing chamber a6, and a common communicated material passing port is arranged on the overlapped part; the front end and the rear end of the gas-material mixing chamber a6 are respectively communicated with an air supply pipeline a2 and a material delivery pipeline a 3. The feeding transfer chamber a5 is provided with a rotating shaft a51 which is externally connected with a driving motor, the rotating shaft a51 is connected with a plurality of straight plate-shaped rotating blades a52, and when the rotating blades a52 rotate, a part of the body at the end part of the rotating blades a52 extends into the gas-material mixing chamber a6 through the material passing opening. The rotating blades a52 can rotate clockwise and anticlockwise, the coupling fuel in the slot cavity between the two blades is fed into the gas-material mixing chamber a6 in portions, and the coupling fuel is carried and blown to the boiler by matching with the wind flow passing through the gas-material mixing chamber a6, so that the coupling fuel can be quickly and fully conveyed even if the coupling fuel is conveyed for a long distance. In addition, the bottom of the gas-material mixing chamber a6 is provided with a discharge opening a61 for timely cleaning heavy and large sediments, and the top of the hopper a4 is provided with an air outlet a41 for connecting with a dust remover to suck the air leakage of the hopper a4 and remove dust.

The independent pneumatic conveying system can adjust the conveying supply quantity of the fuel by controlling the wind speed and the wind quantity, such as adjusting and controlling the source power of a fan, arranging an adjusting valve on a pipeline and the like; the feed mechanism can also adjust the delivery supply amount of the fuel by controlling the rotation speed of the rotating shaft a 51. Therefore, the delivery supply quantity of the coupling fuel to be delivered to the combustion chamber for combustion can be freely and conveniently adjusted, and in addition, the pneumatic delivery is excellent in both the delivery speed and the delivery charging degree, and has no large adjustment delay and delivery quantity error, so that a new boiler combustion cycle balance state can be established in a mode of accurately increasing the fuel feeding quantity and reducing the coal consumption, and the purposes of energy conservation and environmental protection can be achieved by effectively reducing the coal consumption while ensuring the energy output. This is also the high coupling combustion ratio technique that this technical scheme can effectively realize. In addition, when the thickness of the bed material layer is equal to or less than the minimum calibration value, the bed material is supplemented by adding slag and/or sludge in the boiler, and the balance state of the bed material is maintained, which is also a means for realizing the high-coupling combustion ratio technology in the technical scheme.

Referring to fig. 6 and 7, the stable combustion system includes a boiler b1, a fuel inlet furnace tube b2, a primary air tube b3, a secondary air tube b4 and a primary air chamber b5, one end of the fuel inlet furnace tube b2 is connected and communicated with a material conveying pipeline a3, and the other end is connected to a side wall of the boiler b1, and as will be described in the figures of the fuel inlet furnace tube b2, the primary air tube b3 and the secondary air tube b4, the form of an arrow pointing in the figures is used as a reference, which is more intuitive, the internal position of the boiler b1 corresponding to the outlet of the fuel inlet furnace tube b2 is at the dense-phase region or dense-rare-phase intersection of the furnace, so as to ensure that the material enters the dense-phase region of the furnace for combustion, and can be matched with the secondary air tube b4, especially the upper secondary air tube b41, so as to ensure that the upper secondary air flow can suppress and disturb the discharged material in the dense-oxygen-enriched combustion region of the furnace b2, a plurality of the side walls of the boiler b1, that the boiler b enters the front and rear side wall of the boiler b, and the boiler b 867, and the boiler b are connected with the boiler b5, and the boiler tube b inlet furnace are inclined angle 5, and the boiler tube b5 is a boiler tube b5, and a boiler tube b inlet angle of the boiler tube b5 is a furnace inlet angle 5, which is a furnace inlet angle is suitable for forming a horizontal angle 5.

Referring to FIG. 6, the secondary air duct b4 includes an upper secondary air duct b41 and a lower secondary air duct b42 that are attached to the side walls of the boiler b1 and are located above and below the horizontal plane of the fuel-inlet furnace tubes b 2. The lower secondary air duct b42 is a horizontal or downward inclined arrangement mode in the middle of the hearth, at least one path is arranged on the left side wall and the right side wall, in the embodiment, the left path and the right path are exemplified; the upper secondary air pipe b41 is obliquely arranged downwards and deviated to the middle of the hearth, so that air flow discharged from the upper secondary air pipe b41 blows fuel into a pipe orifice of a furnace pipe b2, the pipe orifice can be a diffusion type nozzle, the upper secondary air pipe b41 blows air flow downwards and deviated to the middle of the hearth, at least one path is arranged on the left side wall or the right side wall, in the embodiment, only one path is arranged on the left side wall for indication, actually, one path can be arranged on the right side wall, further, the secondary air pipes b41 on the two opposite paths are staggered in the horizontal direction, the pressing and disturbing areas of materials are enlarged, the effect is enhanced, and the situation that the materials cannot be effectively pressed and disturbed due to direct convection is avoided. The air output of the secondary air duct b4 accounts for 50 percent (the allowable error is +/-5 percent) of the total air output, namely the primary air volume and the secondary air volume respectively account for half, which is the air volume ratio with better effect and easier control in actual measurement. The conventional boiler is modified, the secondary air volume is increased, the primary air volume is reduced, the arrangement positions and angles of the primary air duct and the secondary air duct are adjusted, and full and complete stable combustion is realized, because the primary air volume and the secondary air volume of the conventional boiler are respectively 60% and 40%, and only the lower secondary air duct is provided so far, the strength of staged combustion of the circulating fluidized bed boiler cannot be improved, and the problem of high dioxin concentration in the conventional solid waste treatment field by combining symptoms and 'prescribing medicine' cannot be solved.

The foregoing arrangement can achieve the following combustion conditions: the fuel is directly conveyed into the dense-phase region of the hearth by the pipeline through pneumatic conveying, and the fuel forms a new jet-flow region air hybrid power field in the dense-phase region of the hearth. The solid waste coupling fuel enters a hearth through uniform feeding, quantitative oxygen combustion supporting is realized through air quantity proportioning adjustment, a positive pressure vertical downward inclination angle jet flow nuclear current layer is generated for full disturbance, and the purpose of increasing fuel space retention is achieved; meanwhile, the material is pressed and disturbed because the air above the fuel feeding position is blown towards secondary air which is slightly inclined downwards, so that oxygen-enriched combustion is carried out in the most concentrated region of fuel combustion, the coupled combustion time is prolonged, the fuel is fully combusted in the dense-phase region and the hearth, the residence time of flue gas completely meets the requirement of more than 2S, the actual time is far more than 2S, the decomposition efficiency of the concentration of the dioxin at the temperature of 800 ℃ or more than 850 ℃ reaches more than 99.99 percent, the condition of secondary combustion generated in a discharge flue is eliminated, and the temperature is rapidly cooled when the temperature passes through the flue so as to completely inhibit the recovery phenomenon of the dioxin from the flue gas.

After the technical scheme is implemented, the coupling ratio of various and multi-size solid wastes of the CFB boiler can reach 50% or more, the applicability to the variety and size of common combustible solid wastes is basically fully covered, the water content of partial materials can be unlimited, a secondary combustion chamber (M-shaped boiler flue) is not required to be added, the level of the same kind of treatment in China is greatly exceeded, and the coupling ratio has important guiding significance for opening coal-fired coupling and absorbing industrial solid wastes of the CFB boiler in China; when the coupling ratio of multi-variety and multi-size solid wastes is 35%, the dioxin concentration of the smoke organized discharge port is actually measured to be 0.0027ngTEQ/m, namely the dioxin discharge after solid wastes in the co-combustion industry is reduced by about 77.5% compared with that in the non-co-combustion (0.012 ngTEQ/m for good year) on the contrary, and only about 2.7% of the international (European Union) discharge standard (0.1 ngTEQ/m for good year) exists, so that the research aspects of the harmless treatment technology and process of the domestic industrial solid wastes are greatly and positively influenced; under the condition of annual treatment of 13.2 ten thousand tons of common solid waste treatment projects, the emission of flue gas of 26400 ten thousand Nm3/a, the emission of smoke dust of 1.32t/a, the emission of sulfur dioxide of 9.24t/a, nitrogen oxide of 13.2t/a, mercury and compounds thereof of 0.008t/a can be reduced after the production, and meanwhile, the coal burning quantity can be reduced by about 30 percent.

It will be understood by those skilled in the art that the embodiments of the present invention as described above and shown in the drawings are given by way of example only and are not limiting of the present invention. The purpose of the utility model is completely and effectively realized. The functional and structural principles of the present invention have been shown and described in the embodiments without departing from the principles, embodiments of the present invention may have any deformation or modification.

Claims (9)

1. The utility model provides a coal-fired coupling processing line of CFB boiler to combustible solid useless, includes resourceful processing system and gas cleaning system, its characterized in that: the system also comprises an independent pneumatic conveying system and a stable combustion system, wherein the independent pneumatic conveying system is used for conveying the treated and processed solid waste to the stable combustion system;

the independent pneumatic conveying system comprises a negative pressure fan set (a 1), an air supply pipeline (a 2), a material conveying pipeline (a 3) and a feeding mechanism, wherein the negative pressure fan set (a 1) is communicated with the air supply pipeline (a 2), and the feeding mechanism is connected between the air supply pipeline (a 2) and the material conveying pipeline (a 3) and communicated with the two pipelines;

the stable combustion system comprises a boiler (b 1), a fuel inlet furnace tube (b 2), a primary air duct (b 3), a secondary air duct (b 4) and a primary air chamber (b 5), one end of the fuel inlet furnace pipe (b 2) is communicated with the material conveying pipeline (a 3) while the other end is connected to the side wall of the boiler (b 1), the primary air chamber (b 5) is arranged at the bottom of the boiler (b 1) and is communicated with the hearth of the boiler (b 1) through an air outlet part, the primary air duct (b 3) is communicated with the primary air chamber (b 5), the secondary air duct (b 4) comprises an upper secondary air duct (b 41) and a lower secondary air duct (b 42) which are connected to the side wall of the boiler (b 1) and are respectively positioned above and below the horizontal plane of the fuel inlet furnace duct (b 2), the upper secondary air pipe (b 41) is arranged downwards in a downward inclination mode, so that air flow discharged from the upper secondary air pipe at least blows through the nozzle of the fuel inlet furnace pipe (b 2).

2. The CFB boiler coal-fired coupling processing line for combustible solid waste of claim 1, wherein: the air output of the primary air pipe (b 3) or the air output of the secondary air pipe (b 4) accounts for 45-55% of the total air output of the primary air pipe and the secondary air pipe.

3. The CFB boiler coal-fired coupling processing line for combustible solid waste of claim 1, wherein: feed mechanism includes hopper (a 4), feed transfer chamber (a 5) and material mixing chamber (a 6), feed transfer chamber (a 5) upper portion with hopper (a 4) are connected and are communicated with each other, feed transfer chamber (a 5) lower part with material mixing chamber (a 6) are connected and are communicated with each other, the two of material mixing chamber (a 6) respectively with supply air pipeline (a 2), delivery pipeline (a 3) are connected and are communicated with each other.

4. The CFB boiler coal-fired coupling processing line for combustible solid waste of claim 3, wherein: a rotating shaft (a 51) is arranged in the feeding transfer chamber (a 5), a plurality of rotating blades (a 52) are connected to the rotating shaft (a 51), and the rotating blades (a 52) extend into the gas-material mixing chamber (a 6).

5. The CFB boiler coal-fired coupling processing line for combustible solid waste of claim 4, wherein: the feeding transfer chamber (a 5) and the gas-material mixing chamber (a 6) are cylinders with parallel axes, the side surface of the feeding transfer chamber (a 5) is overlapped with the side surface of the gas-material mixing chamber (a 6), a material passing port communicated with the material passing chamber is arranged on the overlapped part, and the rotating blade (a 52) extends into the gas-material mixing chamber (a 6) through the material passing port.

6. The CFB boiler coal-fired coupling processing line for combustible solid waste of claim 4, wherein: the rotating blades (a 52) are flat plates.

7. The CFB boiler coal-fired coupling processing line for combustible solid waste of claim 1, wherein: the fuel inlet furnace tubes (b 2) are obliquely inserted into the side wall of the boiler (b 1) to form a downward inclination angle with the side wall of the boiler (b 1).

8. The CFB boiler coal-fired coupling processing line for combustible solid waste of claim 7, wherein: the angle range of the downward inclination angle is 35-50 degrees.

9. The CFB boiler coal-fired coupling processing line for combustible solid waste of claim 1, wherein: the internal position of the boiler (b 1) corresponding to the outlet of the fuel inlet furnace pipe (b 2) is at the dense-phase zone or the dense-rare intersection of the hearth.

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