JP2024033256A - Combustion facility comprising supply part for low specific gravity combustion body - Google Patents

Abstract

To provide a combustion facility comprising a supply part for appropriately charging a low specific gravity combustion body into a fluidized bed to combust it.SOLUTION: A combustion facility 1 combusts a combustion body in a fluidized bed 22 formed in an interior, and comprises a fluidized bed furnace 2 in which a flowing air supply part for injecting flowing air into the fluidized bed 22 is provided in a lower part, and a combustion body charging part 29 for supplying the combustion body to the fluidized bed 22 is provided in an upper part. The fluidized bed furnace 2 comprises a low specific gravity combustion body supply part 8 for supplying a low specific gravity combustion body 200 having a lower specific gravity than that of the combustion body to the fluidized bed 22, between a combustion body charging port 29a of the combustion body charging part 29 and an upper surface of the fluidized bed 22.SELECTED DRAWING: Figure 1

Description

The present invention relates to a combustion equipment equipped with a fluidized bed furnace and a supply section of a low specific gravity combustion body.

Fluidized bed furnaces have been known in the past, which form a fluidized bed inside and burn combustion materials such as waste (e.g., garbage and sludge) and fuel (e.g., biomass fuel and waste plastic fuel) in the fluidized bed. ing. In such a fluidized bed furnace, fluidized air is ejected from below into the fluidized bed in order to fluidize the fluidized medium (BM: Bed Material (generally silica sand)) that makes up the fluidized bed, and combustion occurs in the fluidized bed. A combustion body is supplied from above the fluidized bed and burned in the fluidized bed.

On the other hand, as combustion bodies to be burned in a fluidized bed, demand for the above-mentioned biomass fuels and waste plastic fuels has increased in recent years due to the trend toward decarbonization of energy supply. Examples of such combustion materials include sawdust and rice husks for biomass-based fuels, and low-density combustion materials such as fluff for waste plastic fuels.

For example, as a prior art for burning this type of combustion body, a supply pipe for low-density solid incineration material is inserted into the fluidized bed, and the low-density solid incineration material is directly supplied to the bottom side of the furnace of the fluidized bed. There are some that are burned (for example, see Patent Document 1).

In addition, as another prior art, high-calorie waste is sorted out from the waste to be burned in a combustion furnace, the high-calorie waste is thrown into the empty column from above, and the remaining waste is thrown into the empty tower from below. (For example, see Patent Document 2).

JP2003-42424A Japanese Patent Application Publication No. 8-303737

By the way, when a low specific gravity combustion body such as a fluff is introduced from the general solid fuel (combustion body) input section, it is swept away by the flow of combustion gas in the furnace and does not reach the fluidized bed. Sometimes. For this reason, it becomes difficult to maintain the bed temperature because the fuel does not reach the fluidized bed, and stable operation of the fluidized bed furnace may not be possible. In addition, the combustion of the low specific gravity fuel in the upper part of the fluidized bed increases the temperature of the upper part of the fluidized bed, which causes problems such as generation of clinker and poor flow of the fluidized medium due to clinker falling. Further, in the case of a configuration in which heat is recovered in a fluidized bed, there arises a problem of a decrease in the amount of heat absorbed by the intrabed heat collection tubes.

In addition, in the above-mentioned Patent Document 1, the low specific gravity solid incineration material is directly supplied into the bed from the supply pipe inserted into the fluidized bed, but in order to directly supply the low specific gravity combustion body such as fluff into the bed It is necessary to push in with high pressure gas. For this reason, the high pressure gas blown into the fluidized bed makes it difficult to control the combustion temperature.

In addition, in Patent Document 2, since high-calorie waste (combustion body) is injected from above the empty column, it may be burned before reaching the fluidized bed, and the fuel is not supplied to the fluidized bed. It may be difficult to do so.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a combustion facility equipped with a supply section that appropriately charges a low specific gravity combustion body into a fluidized bed and burns it.

In order to achieve the above-mentioned object, a combustion equipment equipped with a low specific gravity combustor supply unit according to the present invention is a combustion equipment that combusts a combustor in a fluidized bed formed inside the fluidized bed. A fluidized bed furnace is provided with a fluidized air supply section at the bottom for blowing out fluidized air, and a combustion body input section for supplying the combustion body into the fluidized bed at the top. , a low specific gravity combustible body supplying section for supplying a low specific gravity combustible body to the fluidized bed is provided between the input port of the combustible body input section and the upper surface of the fluidized bed.

With this configuration, the low specific gravity combustion body can be supplied to the fluidized bed from the low specific gravity combustion body supply section provided between the input port of the combustion body input section for solid fuel and the upper surface of the fluidized bed. Therefore, by supplying the low specific gravity combustor to the fluidized bed from a position close to the fluidized bed, the low specific gravity combustor can appropriately reach the fluidized bed and be combusted.

According to the present invention, it is possible to provide a combustion facility equipped with a low specific gravity combustion body supply section that can appropriately supply the low specific gravity combustion body to the fluidized bed and stabilize combustion in the fluidized bed. .

FIG. 1 is a schematic configuration diagram showing a first combustion facility according to a first embodiment of the present invention. FIG. 2 is a sectional view showing a low specific gravity combustion body supply section of the first combustion equipment shown in FIG. 1. FIG. 3 is a schematic configuration diagram showing a second combustion facility according to a second embodiment of the present invention. FIG. 4 is a schematic configuration diagram showing a third combustion facility according to a third embodiment of the present invention. FIG. 5 is a schematic diagram showing a modification of the fluidized bed furnace according to the present invention.

Hereinafter, one embodiment of the present invention will be described based on the drawings. The combustion equipment 1, 100, 110 according to the following embodiments is only one embodiment. Therefore, the present invention is not limited to the following embodiments, and additions, deletions, and changes can be made without departing from the spirit of the present invention.

(First embodiment)
FIG. 1 is a schematic configuration diagram showing a first combustion equipment 1 according to a first embodiment. FIG. 2 is a sectional view showing the low specific gravity combustion body supply section 8 of the first combustion equipment 1 shown in FIG. As shown in FIG. 1, the first combustion equipment 1 includes a fluidized bed furnace 2 that burns a combustion body, and a boiler 5 that recovers heat from exhaust gas discharged from the fluidized bed furnace 2. Further, the combustion equipment 1 includes a dust collector 62 connected to the boiler 5 through a first gas duct 61 and a chimney 65 connected to the dust collector 62 through a second gas duct 63. The dust collector 62 is, for example, a bag filter. The second gas duct 63 is provided with an induction fan 64 . However, the combustion equipment 1 does not necessarily need to include the boiler 5, and the fluidized bed furnace 2 may be connected to the dust collector 62 through the first gas duct 61.

The fluidized bed furnace 2 of this embodiment is of an internal circulation type in which a fluidized bed section 20 is formed inside. Further, the fluidized bed furnace 2 of this embodiment is of a dispersion plate type. A freeboard section 21 for secondary combustion is formed above the fluidized bed section 20. The fluidized bed section 20 has a fluidized bed 22 formed of a fluidized medium 10 such as silica sand. The fluidized bed 22 of this embodiment includes a combustion cell 25 in the central portion, a circulation cell 26 formed on both outsides of the combustion cell 25, and a combustion cell 26 formed on both outsides of the combustion cell 25, which is formed by a first partition wall 23 and a second partition wall 24. It is partitioned into a heat absorption cell 27 (in this embodiment, the heat absorption cell 27 is provided with a heat exchanger 28, but the heat exchanger 28 may not be provided). That is, the combustion cell 25 and the heat absorption cell 27 are provided adjacent to each other with the circulation cell 26 in between. The first partition wall 23 has an upper end located above the fluidized bed 22, and partitions the combustion cell 25 and the circulation cell 26 so that they communicate with each other below. The second partition wall 24 has an upper end located on the upper surface of the fluidized bed 22 and a lower end located below the first partition wall 23, and communicates the circulation cell 26 and the heat absorption cell 27 from above and below. It is partitioned in a state where it is separated. In this embodiment, a heat exchanger 28 for generating and/or superheating water vapor is arranged in the heat absorption cell 27 .

Furthermore, a freeboard section 21 formed above the fluidized bed section 20 is provided with a combustion body input section 29 that supplies combustion bodies such as solid fuel to the fluidized bed 22 . The combustion body input portion 29 is provided at an angle such that the combustion body introduced into the fluidized bed furnace 2 from the combustion body input port 29 a is input into the combustion cells 25 of the fluidized bed 22 .

A fluidized air supply device 3 is provided at the bottom of the fluidized bed furnace 2 . The fluidized air supply device 3 includes a plurality of air supply holes 30 that serve as a fluidized air supply section for jetting fluidized air into the fluidized bed 22, a combustion cell air supply device 31, a circulation cell air supply device 32, and a heat collection cell air supply device 33. Be prepared. The fluidized air supply device 3 further includes a first fan 34 that supplies air to each of the combustion cell air supply device 31, the circulation cell air supply device 32, and the heat absorption cell air supply device 33. The combustion cell air supply device 31 includes a flow rate adjustment device 31a that adjusts the flow rate of air. Similarly, the circulation cell air supply device 32 includes a flow rate adjustment device 32a, and the heat collection cell air supply device 33 includes a flow rate adjustment device 33a. The combustion cell air 35, the circulation cell air 36, and the heat absorption cell air 37 are adjusted to appropriate flow rates by the combustion cell air supply device 31, the circulation cell air supply device 32, and the heat absorption cell air supply device 33, respectively. . Combustion cell air 35 is injected into the combustion cell 25 , circulation cell air 36 is injected into the circulation cell 26 , and heat absorption cell air 37 is injected into the heat absorption cell 27 .

In this fluidized air supply device 3, the velocity of the combustion cell air 35 is greater than the velocity of the circulation cell air 36 and the heat collection cell air 37. As a result, the superficial velocity of the combustion cell 25 of the fluidized bed 22 becomes larger than the superficial velocity of the circulation cell 26 and the heat absorption cell 27, and a density difference occurs in the fluidized medium 10. This density difference causes the fluid medium 10 to flow. Specifically, the fluidized medium 10 is caused to flow from the combustion cell 25 to the heat absorption cell 27 via the circulation cell 26, and then from the heat absorption cell 27 to the combustion cell 25.

More specifically, the fluidized medium 10, which has reached a high temperature by burning a combustion body in the combustion cell 25 of the fluidized bed 22, flows from the combustion cell 25 to the circulation cell 26 through the lower part of the first partition wall 23. The fluidized medium 10 in the circulation cell 26 passes above the second partition wall 24 and flows into the heat absorption cell 27 . Since the heat exchanger 28 is disposed in the heat absorption cell 27 , the heat of the fluidized medium 10 that has flowed into the heat absorption cell 27 is recovered by the heat exchanger 28 . On the other hand, the fluidized medium 10 whose heat has been recovered in the heat absorption cell 27 flows from the heat absorption cell 27 to the combustion cell 25 through below the second partition wall 24 and the first partition wall 23 .

In this way, the fluidized bed 22 is partitioned into a combustion cell 25, a circulation cell 26, and a heat absorption cell 27 by the first partition wall 23 and the second partition wall 24, and the fluidized medium 10, which has become high temperature in the combustion cell 25, is circulated as described above, and the heat is recovered by the heat absorption cell 27.

Furthermore, the freeboard section 21 is equipped with a tertiary air supply section 39 that supplies tertiary air for secondary combustion. The tertiary air supply section 39 is provided above the combustion body input port 29a of the combustion body input section 29. Tertiary air 42 is supplied to the tertiary air supply section 39 from a second fan 41 via a third supply path 40 . Although a plurality of second fans 41 are shown in this figure to clarify the configuration, the present invention is not limited to this example.

Further, the bottom of the fluidized bed section 20 is a hopper 45 for discharging the residue of the combustion body (for example, ash, metal pieces, etc.) together with the fluidized medium 10. The hopper 45 has a discharge port 46 in the center, and the inner surface of the hopper 45 is inclined diagonally downward toward the discharge port 46. This hopper 45 is provided with the air supply hole 30 .

However, the configuration of the fluidized bed furnace 2 is not limited to this, and can be changed as appropriate. For example, the fluidized bed furnace 2 may not include the heat collection cell 27, and the combustion body may be combusted throughout the inside of the fluidized bed furnace 2.

In the boiler 5, steam is generated by the exhaust gas discharged from the fluidized bed furnace 2. More specifically, the boiler 5 includes a first flue 50 whose upper portions communicate with the freeboard portion 21 located above the fluidized bed furnace 2, and a second flue 51 whose lower portions communicate with the first flue 50. It has Heat exchangers 52 and 53 are arranged within the second flue 51. Note that a heat exchanger may also be disposed within the first flue 50. The steam generated by the boiler 5 is sent to a turbine (not shown) and used for power generation or a heat source.

The fluidized bed section 20 is equipped with a low-specific gravity combustion body supply section 8 that supplies a low-specific gravity combustion body 200 such as fluff, which has a lower specific gravity than a combustion body such as solid fuel, to the combustion cell 25. The supply port 8a of the low specific gravity combustion body supply section 8 is provided below the combustion body input port 29a of the combustion body input section 29 and above the upper surface of the fluidized bed 22 of the fluidized bed section 20. The low specific gravity combustion body supply section 8 is provided on the wall surface of the fluidized bed furnace 2 .

In this embodiment, the low specific gravity combustion body 200 introduced into the fluidized bed 22 from the low specific gravity combustion body supply section 8 is conveyed by a gas conveying device 80. In the gas conveying device 80, the low specific gravity combustion body 200 supplied from the hopper 81 to the low specific gravity combustion body supply path 82 via the pressure equalization system 83 is conveyed by gas to the low specific gravity combustion body supply section 8 and is placed in the fluidized bed 22. is input (supplied) to.

In the first combustion equipment 1, a part of the exhaust gas discharged from the fluidized bed furnace 2 is used for gas transportation of the low specific gravity combustion body 200. This embodiment includes an exhaust gas supply device 7 that supplies part of the exhaust gas that has passed through the dust collector 62 to a gas transport device 80. The exhaust gas supply device 7 has an exhaust gas supply path 70 that connects the second gas duct 63 and the low specific gravity combustion body supply path 82 . The exhaust gas supply path 70 is equipped with a supply fan 71. The low specific gravity combustion body 200 is cut out from the hopper 81 by the pressure equalization system 83. The pressure equalization system 83 includes a quantitative feeder 83a provided below the hopper 81, an upper rotary valve 83b provided below the quantitative feeder 83a, a pressure equalization hopper 83c, and a lower rotary valve 83d. The pressure equalization system 83 supplies a predetermined amount of low specific gravity combustion bodies 200 per unit time from the hopper 81 to the low specific gravity combustion bodies through the pressure equalization hopper 83c using a quantitative feeder 83a, an upper rotary valve 83b, and a lower rotary valve 83d. It can be supplied to the supply path 82. The pressure equalizing hopper 83c and the low specific gravity combustion body supply path 82 are separated from each other in terms of pressure by the rotary valves 83b and 83d. The low specific gravity combustor 200 is supplied in free fall to the low specific gravity combustor supply path 82 via the pressure equalization system 83, and is transported to the low specific gravity combustor supply section 8 by the exhaust gas sent from the supply fan 71, where it is placed in a fluidized bed. 22 is injected (supplied). The low specific gravity combustion body 200 introduced into the fluidized bed 22 from the low specific gravity combustion body supply section 8 can be appropriately delivered to the combustion cells 25 of the fluidized bed 22 by adjusting the speed of exhaust gas with the supply fan 71. Note that the speed of the exhaust gas may be adjusted by installing a flow rate adjustment device such as a damper in the exhaust gas supply device 7 or the gas transport device 80.

As shown in FIG. 2, the low specific gravity combustion body supply section 8 of this embodiment includes a water cooling device 85. In the water cooling device 85, the low specific gravity combustion body supply section 8 has a double pipe structure, the center part is a passage 84 for the low specific gravity combustion body 200, and the periphery of the passage 84 is a water cooling section 86. The end shape of the passage 84, such as the diameter, can be made into a shape that allows the low specific gravity combustion body 200 to reach the combustion cell 25 of the fluidized bed 22. The water cooling section 86 supplies cooling water 87 from one of the bases of the low specific gravity combustion body supply section 8, and supplies the cooling water 87 that has flowed to the tip (inner direction of the furnace) of the low specific gravity combustion body supply section 8 to the low specific gravity combustion body supply section 8. It is adapted to be discharged from the other base of the section 8. That is, the water cooling section 86 of this embodiment is supplied with cooling water 87 from a water supply port 88 located outside the fluidized bed furnace 2, and the cooling water flowing inward of the fluidized bed furnace 2 is reversed at the tip. The fluidized bed furnace 2 is designed to be discharged from a drain port 89 located outside. The structure of the water cooling section 86 may be a structure other than a double pipe structure, and is not limited to this embodiment.

The low specific gravity combustion body supply section 8 of this embodiment is provided at a predetermined angle θ with respect to the wall surface of the fluidized bed furnace 2. The angle θ can be set to an angle at which the low specific gravity combustion body 200 supplied into the fluidized bed furnace 2 from the tip of the low specific gravity combustion body supply section 8 is injected toward the combustion cell 25 of the fluidized bed 22. .

According to the first combustion equipment 1 configured as described above, the low specific gravity combustion body 200 is provided between the combustion body input port 29a of the combustion body input portion 29 of the fluidized bed furnace 2 and the upper surface of the fluidized bed 22. The low specific gravity combustion body can be supplied to the fluidized bed 22 from the supply port 8a of the low specific gravity combustion body supply section 8. Therefore, the low specific gravity combustion body 200 can be supplied to the fluidized bed 22 from a position close to the fluidized bed 22, and the low specific gravity combustion body 200 can be appropriately reached to the fluidized bed 22 and combusted. Thereby, even when the low specific gravity combustion body 200 is used as a fuel, it becomes possible to maintain the bed temperature appropriately.

Moreover, since the low specific gravity combustion body 200 is gas-transported by exhaust gas, combustion of the low specific gravity combustion body 200 until it is introduced into the fluidized bed furnace 2 and reaches the fluidized bed 22 is suppressed. Thereby, it becomes possible to more appropriately supply the low specific gravity combustion body 200 to the combustion cell 25.

(Second embodiment)
FIG. 3 is a schematic configuration diagram showing the second combustion equipment 100 according to the second embodiment. The second combustion equipment 100 is an example in which the gas that conveys the low specific gravity combustion body 200 is different from exhaust gas. In the first combustion equipment 1, the low specific gravity combustion body 200 transported by the gas conveying device 80 was the exhaust gas supplied by the exhaust gas supply device 7, but in the second combustion equipment 100, the low specific gravity combustion body 200 was transported by air. are doing. Note that the second combustion equipment 100 and the first combustion equipment 1 differ only in the configuration for conveying the low specific gravity combustion body 200 and have the same other configurations, so the same configurations are given the same reference numerals and Explanation will be omitted.

The gas conveying device 80 of the second combustion equipment 100 is configured to transport the low specific gravity combustion body 200 supplied from the hopper 81 to the low specific gravity combustion body supply path 82 via the pressure equalization system 83 to the low specific gravity combustion body supply section 8. A fan 75 is provided. The conveyance fan 75 is an example of supplying air to the low specific gravity combustion body supply path 82 via the supply path. Note that another gas (including gas) may be supplied from the transport fan 75 to the low specific gravity combustion body supply path 82 to transport the low specific gravity combustion body 200 as a gas.

Further, according to the second combustion equipment 100, by supplying additional air from the conveying fan 75 to the supply path 76 connected to the outlet of the pressure equalization system 83 installed below the hopper 81, the air ratio in the layer is increased. Additional air for adjustment can be supplied to the fluidized bed 22 via the low specific gravity combustion body supply path 82 and the supply port 8a of the low specific gravity combustion body supply section 8. In this specification and claims, the term "intra-layer air ratio" refers to the "air ratio that contributes to intra-layer combustion." Additional air is injected towards the top of the combustion cells 25 of the fluidized bed 22. The additional air can increase the velocity above the superficial velocity in the combustion cell 25 section. By making the injection speed of the additional air higher than the superficial velocity, the additional air can be appropriately supplied to the combustion cells 25 of the fluidized bed 22. The supply amount and flow rate of additional air can be adjusted by the conveyance fan 75. Note that the speed of the additional air may be adjusted by installing a flow rate regulating device such as a damper in the gas conveying device 80. Since the other configurations of the second combustion equipment 100 are the same as those of the first combustion equipment 1, description of the other configurations will be omitted.

Also in the second combustion equipment 100 configured as described above, the low specific gravity combustion body 200 is provided between the combustion body input port 29a of the combustion body input portion 29 of the fluidized bed furnace 2 and the upper surface of the fluidized bed 22. The low specific gravity combustion body can be supplied to the fluidized bed 22 from the supply port 8a of the low specific gravity combustion body supply section 8. Therefore, the low specific gravity combustion body 200 can be supplied to the fluidized bed 22 from a position close to the fluidized bed 22, and the low specific gravity combustion body 200 can be appropriately reached to the fluidized bed 22 and combusted. Thereby, even when the low specific gravity combustion body 200 is used as a fuel, it becomes possible to maintain the bed temperature appropriately.

Further, according to the second combustion equipment 100, additional air can be supplied to the fluidized bed 22 from the transfer fan 75. Thereby, according to the second combustion equipment 100, even when the type of combustion body is changed, the intralayer air ratio can be changed by supplying additional air from the additional air supply section. Thereby, even if the type of fuel body is changed, the superficial velocity within the layer can be kept within a certain range. Therefore, even if the type of fuel body is changed, the originally planned boiler evaporation amount can be secured.

(Third embodiment)
FIG. 4 is a schematic configuration diagram showing the third combustion equipment 110 according to the third embodiment. The third combustion equipment 110 is an example in which a configuration for supplying additional air to the fluidized bed 22 is added to the configuration of the first combustion equipment 1 described above. Note that the third combustion equipment 110 and the first combustion equipment 1 differ only in the configuration related to the additional air supply device 9 and have the same other configurations, so the same configurations are given the same reference numerals and Explanation will be omitted.

The third combustion equipment 110 is equipped with an additional air supply device 9 that supplies additional air for adjusting the intralayer air ratio of the fluidized bed 22 in addition to the configuration of the first combustion equipment 1 . In the additional air supply device 9 of this embodiment, the additional air supply path 90 is connected to a three-way valve 92 provided in the exhaust gas supply path 70. The additional air supply path 90 is provided with an additional air supply fan 91 .

According to the third combustion equipment 110, the additional air supply path 90 is connected by a three-way valve 92 to the exhaust gas supply path 70 connected to the outlet of the pressure equalization system 83 installed below the hopper 81. Additional air is supplied from the fan 91 to the additional air supply path 90. Thereby, additional air can be supplied to the fluidized bed 22 from the supply port 8a of the low specific gravity combustion body supply section 8 via the three-way valve 92 provided in the exhaust gas supply path 70 and the low specific gravity combustion body supply path 82. Additional air is injected towards the top of the combustion cells 25 of the fluidized bed 22. The additional air can increase the velocity above the superficial velocity in the combustion cell 25 section. By making the injection speed of the additional air higher than the superficial velocity, the additional air can be appropriately supplied to the combustion cells 25 of the fluidized bed 22. The supply amount and flow rate of additional air can be adjusted by the additional air supply fan 91. The additional air supply device 9 may be provided in case the superficial velocity changes due to a change in the combustion body introduced into the fluidized bed 22 or the like. Since the other configurations of the third combustion equipment 110 are the same as those of the first combustion equipment 1 described above, explanations of the other configurations will be omitted.

Also in the third combustion equipment 110 configured as described above, the low specific gravity combustion body 200 is provided between the combustion body input port 29a of the combustion body input portion 29 of the fluidized bed furnace 2 and the upper surface of the fluidized bed 22. The low specific gravity combustion body can be supplied to the fluidized bed 22 from the supply port 8a of the low specific gravity combustion body supply section 8. Therefore, the low specific gravity combustion body 200 can be supplied to the fluidized bed 22 from a position close to the fluidized bed 22, and the low specific gravity combustion body 200 can be appropriately reached to the fluidized bed 22 and combusted. Thereby, even when the low specific gravity combustion body 200 is used as a fuel, it becomes possible to maintain the bed temperature appropriately.

Further, according to the third combustion equipment 110, additional air for adjusting the intra-bed air ratio can be supplied from the conveyance fan 75 to the fluidized bed 22. Thereby, according to the third combustion equipment 110, even when the type of combustion body is changed, the intralayer air ratio can be changed by supplying additional air from the additional air supply section. Thereby, even if the type of fuel body is changed, the superficial velocity within the layer can be kept within a certain range. Therefore, even if the type of fuel body is changed, the originally planned boiler evaporation amount can be secured.

(Modified example)
FIG. 5 is a schematic configuration diagram showing a modification of the fluidized bed furnace 2 part. FIG. 5 shows only the part of the fluidized bed 22 in the above-described embodiment, and only the configurations that are different from the above-described embodiment will be explained, and the same configurations will be denoted by the same reference numerals and the explanation thereof will be omitted. In the modification shown in FIG. 5, the fluidized air supply section that supplies fluidized air to the fluidized bed 22 uses an aeration tube method that blows out fluidized air from an aeration tube 38 provided inside the fluidized bed 22. Since the configuration for supplying air to the diffuser pipe 38 can employ a known technique, a description thereof will be omitted. Further, in FIG. 5, the fluidized bed 22 includes a combustion cell 25 in the center and heat absorption cells 27 formed on both sides of the combustion cell 25. The combustion cell 25 and the heat absorption cell 27 are separated by a first partition wall 23. In addition, in each of the first combustion equipment 1, the second combustion equipment 100, and the third combustion equipment 110, the method of the fluidized air supply section that supplies fluidized air to the fluidized bed 22 is either a dispersion plate method or a diffuser pipe method. But that's fine. Further, the fluidized bed 22 may have a structure including a circulation cell 26 or may not have a circulation cell 26.

In the above embodiment, the low specific gravity combustion body supply section 8 is shown at one location, but the low specific gravity combustion body supply section 8 may be provided at multiple locations. For example, they can be provided at opposing positions in the fluidized bed section 20.

Further, in the above embodiment, the circulation cell 26 and the heat absorption cell 27 are provided on both sides of the combustion cell 25, but a configuration in which only one side is provided with the circulation cell 26 and the heat absorption cell 27 is also applicable. As long as there is no circulation cell 26, a structure in which the heat absorption cell 27 is provided only on one side can also be applied.

Further, in the above embodiment, an example of an internal circulation type fluidized bed furnace 2 has been described, but other types of fluidized bed furnaces such as an external circulation type and a bubbling type can also be applied.

Further, each configuration and combination thereof in the above-described embodiments are merely examples, and additions, omissions, substitutions, and other changes to the configurations can be made as appropriate without departing from the spirit of the present invention. . The invention is not limited by the embodiments, but only by the scope of the claims.

(summary)
The combustion equipment 1, 100, 110 according to the present invention is a combustion equipment that burns a combustion body in a fluidized bed 22 formed inside, and supplies fluidized air for jetting fluidized air into the fluidized bed 22. The fluidized bed furnace 2 includes a fluidized bed furnace 2 in which a combustion body input section is provided at the lower part and a combustion body input section for supplying the combustion body to the fluidized bed 22 is installed at the top. A low specific gravity combustion body supply section 8 is provided between the mouth and the upper part of the fluidized bed 22 for supplying a low specific gravity combustion body 200 having a lower specific gravity than the combustion body to the fluidized bed 22.

With this configuration, the low specific gravity combustion body 200 having a specific gravity lower than that of the combustion body is supplied from the low specific gravity combustion body supply unit 8 provided between the input port of the combustion body input unit such as solid fuel and the upper surface of the fluidized bed 22. It can be supplied to a fluidized bed 22. Therefore, by supplying the low specific gravity combustion body 200 to the fluidized bed 22 from a position close to the fluidized bed 22, the low specific gravity combustion body 200 can be appropriately caused to reach the fluidized bed 22 and combusted.

Further, the fluidized bed furnace 2 includes a fluidized bed section including the fluidized bed 22 and a freeboard section 21 for secondary combustion formed above the fluidized bed section, and the low specific gravity combustion body supply section. Reference numeral 8 denotes a fluidized bed section of the fluidized bed furnace 2, and a supply port may be provided above the upper surface of the fluidized bed 22. With this configuration, the low specific gravity combustion body 200 can be supplied from the supply port provided in the fluidized bed portion near the upper surface of the fluidized bed 22, and the low specific gravity combustion body 200 can be appropriately delivered to the fluidized bed.

Further, the fluidized bed 22 has a heat absorption cell 27 and a combustion cell 25, and the low specific gravity combustion body supply section 8 is configured such that the low specific gravity combustion body 200 is supplied from the tip of the low specific gravity combustion body supply section 8 to the combustion cell 25. The angle may be set so that the spray is directed toward the cell 25. With this configuration, the low specific gravity combustion body 200 can be appropriately injected from the tip of the low specific gravity combustion body supply section 8 toward the combustion cell 25 inside the fluidized bed furnace 2 .

Further, a gas conveying device 80 may be provided that uses a part of the exhaust gas discharged from the fluidized bed furnace 2 to convey the low specific gravity combustion body 200. With this configuration, the low specific gravity combustion body 200 is supplied to the fluidized bed furnace 2 from the low specific gravity combustion body supply section 8 together with the exhaust gas. Therefore, when the low specific gravity combustion body 200 is supplied to the fluidized bed furnace 2, the low specific gravity combustion body 200 is prevented from starting combustion by the exhaust gas, and the low specific gravity combustion body 200 is appropriately delivered to the fluidized bed 22. Can be done.

Further, the gas conveying device 80 may be configured to be able to adjust the speed of the exhaust gas. With this configuration, the speed of the exhaust gas can be changed depending on the low specific gravity combustion body 200, and the low specific gravity combustion body 200 can be appropriately supplied to the combustion cell 25 of the fluidized bed furnace 2.

Further, the low specific gravity combustion body supply section 8 may include a water cooling device 85 that cools a predetermined area from the wall surface of the fluidized bed furnace 2. With this configuration, it is possible to prevent the low specific gravity combustion body 200 such as fluff from softening and adhering inside the low specific gravity combustion body supply section 8 .

Further, an additional air supply device 9 may be provided for supplying additional air for adjusting the air ratio in the bed to the fluidized bed 22 via the low specific gravity combustion body supply section 8. With this configuration, when the type of combustion body is changed, the intralayer air ratio can be changed using additional air. Thereby, the superficial velocity within the layer can be kept within a certain range. Therefore, even if the type of fuel body is changed, the originally planned boiler evaporation amount can be secured.

1 First combustion equipment
2 Fluidized bed furnace
3 Fluid air supply device
5 Boiler
7 Exhaust gas supply device
8 Low specific gravity combustion body supply section 8a Supply port
9 Additional air supply device 10 Fluidized medium 20 Fluidized bed section 21 Freeboard section 22 Fluidized bed 23 First partition wall 24 Second partition wall 25 Combustion cell 26 Circulation cell 27 Heat absorption cell 28 Heat exchanger 29 Combustion body input section 29a Combustion Body input port 30 Air supply hole (fluid air supply section)
31 Combustion cell air supply device 31a Flow rate adjustment device 32 Circulation cell air supply device 32a Flow rate adjustment device 33 Heat collection cell air supply device 33a Flow rate adjustment device 34 First fan 35 Combustion cell air 36 Circulation cell air 37 Heat collection cell air 38 Dispersion Trachea 39 Tertiary air supply section 40 Third supply path 41 Second fan 42 Tertiary air 45 Hopper 46 Discharge port 50 First flue 51 Second flue 52 Heat exchanger 53 Heat exchanger 61 First gas duct 62 Dust collector 63 Second gas duct 64 Induction fan 65 Chimney 70 Exhaust gas supply path 71 Supply fan 75 Conveyance fan 76 Supply path 80 Gas conveyance device 81 Hopper 82 Low specific gravity combustion body supply path 83 Pressure equalization system 83a Quantitative feeder 83b Upper rotary valve 83c Pressure equalization hopper 83d Lower rotary valve 84 Passage 85 Water cooling device 86 Water cooling section 87 Cooling water 88 Water supply port 89 Drain port 90 Additional air supply path 91 Additional air supply fan 92 Three-way valve 100 Second combustion equipment 110 Third combustion equipment 200 Low specific gravity combustion body

Claims (7)

A combustion equipment that burns a combustion body in a fluidized bed formed inside,
A fluidized bed furnace is provided in which a fluidized air supply part for ejecting fluidized air into the fluidized bed is provided at a lower part, and a combustion body input part is provided at an upper part to supply the combustion body to the fluidized bed,
The fluidized bed furnace includes a low specific gravity combustion body that supplies a low specific gravity combustion body having a specific gravity lower than that of the combustion body to the fluidized bed between the combustion body input port of the combustion body input part and the upper surface of the fluidized bed. Combustion equipment with a feed of low specific gravity combustion bodies, comprising a feed. The fluidized bed furnace has a fluidized bed section including the fluidized bed and a freeboard section for secondary combustion formed above the fluidized bed section,
The low specific gravity combustible body supply section is the fluidized bed section, and the combustion comprising a low specific gravity combustible body supply section according to claim 1, wherein the supply port is provided above the upper surface of the fluidized bed. Facility. The fluidized bed has a heat absorption cell and a combustion cell,
The low specific gravity combustion body supplying unit according to claim 1 or 2, wherein the low specific gravity combustion body is set at an angle such that the low specific gravity combustion body is injected from the tip of the low specific gravity combustion body supplying unit toward the combustion cell. Combustion equipment with a supply section for specific gravity combustion bodies. Combustion equipment equipped with a low specific gravity combustible body supply section according to claim 1 or 2, comprising a gas conveying device that uses a part of the exhaust gas discharged from the fluidized bed furnace to convey the low specific gravity combustible body. . The combustion equipment according to claim 4, wherein the gas conveying device is configured to be able to adjust the speed of the exhaust gas. 3. A combustion equipment equipped with a low specific gravity combustion body supply unit according to claim 1 or 2, wherein the low specific gravity combustion body supply unit includes a water cooling device that cools a predetermined area from the wall surface of the fluidized bed furnace. The supply of low specific gravity combustion bodies according to claim 1 or 2, further comprising an additional air supply device that supplies additional air for adjusting the air ratio in the bed to the fluidized bed via the low specific gravity combustion body supply section. Combustion equipment with parts.

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