WO2019107423A1 - 流動床炉及びその運転方法 - Google Patents
流動床炉及びその運転方法 Download PDFInfo
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- WO2019107423A1 WO2019107423A1 PCT/JP2018/043807 JP2018043807W WO2019107423A1 WO 2019107423 A1 WO2019107423 A1 WO 2019107423A1 JP 2018043807 W JP2018043807 W JP 2018043807W WO 2019107423 A1 WO2019107423 A1 WO 2019107423A1
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- combustion gas
- fluidized bed
- combustion
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- gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
- F23C10/28—Control devices specially adapted for fluidised bed, combustion apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/30—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having a fluidised bed
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- the present invention relates to a fluidized bed furnace and a method of operating the same.
- a fluidized bed furnace is conventionally provided with a fluidized bed in which a fluidized medium filled in the lower part of the furnace is made to flow with a flowing gas blown out from the furnace bottom, and a fluidized bed furnace performing low air ratio combustion of fuel (combustion object) in the fluidized bed.
- fuel combustion object
- the fuel is dried and pyrolyzed and gasified by partially burning the fuel by setting the air ratio of the fluidizing gas to a low air ratio of less than 1.
- Patent Documents 1 and 2 disclose a fluidized bed furnace of this type.
- the fluidized bed furnace of Patent Document 1 is composed of a fluidized bed portion and a freeboard portion located above the fluidized bed portion.
- a fluidizing gas having an air ratio of 0.3 to 0.6 is supplied to the bottom of the fluidized bed, and dioxins having an air ratio of 0.4 to 0.7 in the vicinity of the surface of the fluidized bed.
- the combustion air for decomposition is supplied, and the secondary air is supplied to the freeboard portion.
- partial combustion of the fuel in the fluidized bed portion is performed, and the generated gas and char generated in the fluidized bed portion are burned in the freeboard portion.
- the fluidized bed furnace of Patent Document 2 includes a fluidized bed portion, a freeboard portion positioned above the fluidized bed portion, and a post-combustion region positioned above the freeboard portion.
- the bottom of the fluidized bed is supplied with primary air at an air ratio of 1 or less, the freeboard is made into a highly oxidizing atmosphere with an air ratio of 1.0 to 1.5 by secondary air blown, and the post-combustion zone is The air ratio is set to 1.5 or more by the tertiary air blown.
- partial combustion of the fuel is performed in the fluidized bed, and the generated gas generated in the fluidized bed is burned in the freeboard, and the unburned gas components in the exhaust gas of the freeboard are post-combusted Burn in the area.
- the present invention has been made in view of the above circumstances, and in a fluidized bed furnace provided with a fluidized bed portion where slow partial combustion of fuel is performed and a freeboard portion provided on the upper side, the freeboard portion It aims at providing the technology which controls the sudden combustion reaction in
- a fluidized bed furnace is A fluid bed section for burning fuel; A freeboard section located above the fluid bed section; A fuel inlet for injecting the fuel into the freeboard portion; A secondary combustion gas for blowing a secondary combustion gas whose oxygen concentration has been adjusted by the combustion exhaust gas generated by the freeboard portion to the freeboard portion so as to suppress abnormal combustion in the freeboard portion of the fuel And a supply unit.
- the local and rapid combustion reaction in the freeboard section is caused by the secondary combustion gas containing the combustion exhaust gas having a lower oxygen concentration than air being blown into the freeboard section. Be suppressed.
- the second combustion gas supply unit may be disposed downstream of the flow of the combustion gas with respect to the fuel inlet of the free board and toward the position adjacent to the fuel inlet. It may include an unburned gas supply port into which the next combustion gas is blown.
- the secondary combustion gas containing combustion exhaust gas having a lower oxygen concentration than air is blown immediately downstream of the fuel inlet, so that the local area of the freeboard, in particular, at the fuel inlet and its periphery, can be reduced. And the rapid combustion reaction is suppressed.
- the secondary combustion gas supply unit is connected to a fuel supply path leading to the fuel inlet so that the secondary combustion gas is mixed with the fuel and supplied from the fuel inlet.
- the secondary combustion gas supply pipe for supplying the secondary combustion gas may be included.
- the fluidized bed furnace is configured such that a tertiary combustion gas whose oxygen concentration is adjusted by the combustion exhaust gas and whose oxygen concentration is higher than that of the secondary combustion gas is higher than that of the secondary combustion gas supply unit of the free board unit. It may further include a tertiary combustion gas supply unit for blowing downstream of the flow of combustion gas.
- the combustion of the combustible gas in the freeboard portion can be slowed down by blowing the tertiary combustion gas including the combustion exhaust gas having a lower oxygen concentration than air into the freeboard portion.
- the tertiary combustion gas supply unit supplies tertiary combustion gas having a higher concentration of oxygen toward the downstream side of the flow of the combustion gas, and multiple stages of tertiary combustion gas dispersed in the flow direction of the combustion gas
- the supply port may be included.
- the combustion gas of the combustible gas in the freeboard section is made slower by supplying the tertiary combustion gas having a high oxygen concentration toward the downstream side of the flow of the combustion gas with a large amount of unburned combustion gas, and also locally And rapid combustion reaction can be suppressed.
- the tertiary combustion gas supply unit is a temperature sensor for detecting a temperature of a diffusion region of the tertiary combustion gas blown in, and the combustion exhaust gas with respect to air based on a detection value of the temperature sensor.
- a controller configured to adjust the oxygen concentration of the tertiary combustion gas such that the detection value of the temperature sensor falls within a predetermined range by changing the mixing amount of
- the oxygen concentration of the tertiary combustion gas is adjusted so that the temperature of the freeboard portion falls within a predetermined range, the combustion of the combustible gas in the freeboard portion can be slowed, and It is possible to suppress local and rapid combustion reaction in the freeboard part.
- a rapid combustion reaction in the freeboard portion is suppressed. it can.
- FIG. 1 is a block diagram showing a schematic configuration of a combustion system including a fluidized bed furnace according to an embodiment of the present invention.
- FIG. 2 is a view showing a schematic configuration of a fluidized bed furnace according to an embodiment of the present invention.
- FIG. 3 is an enlarged view of the fluidized bed portion of the fluidized bed furnace.
- FIG. 4 is an enlarged view of a fluidized bed portion of the fluidized bed furnace according to the first modification.
- combustion system 100 First, the configuration of a combustion system 100 including a fluidized bed furnace 1 according to an embodiment of the present invention will be described.
- the combustion system 100 shown in FIG. 1 is a system that burns fuel (combustion target) such as coal, biomass, RDF, municipal waste, and industrial waste, and recovers its exhaust heat.
- fuel combustion target
- FIG. 1 is a system that burns fuel (combustion target) such as coal, biomass, RDF, municipal waste, and industrial waste, and recovers its exhaust heat.
- the combustion system 100 comprises a fluidized bed furnace 1 for burning fuel.
- the flue gas system 3 of the fluidized bed furnace 1 is provided with a heat exchange device 31, a cyclone dust collector 32, a bag filter 33, and an induction blower 34 which is an induction fan. Exhaust heat from the fluidized bed furnace 1 is recovered by the heat exchanger 31 and dust is separated by the cyclone type dust collector 32 and the bag filter 33, and a part thereof is discharged out of the system through a chimney not shown by the induction blower 34. Be done.
- An exhaust gas recirculation system 4 is connected to the downstream side of the bag filter 33 of the combustion exhaust gas system 3.
- a gas recirculation blower 40 is provided in the exhaust gas recirculation system 4, and a part of the combustion exhaust gas of the combustion exhaust gas system 3 is returned to the fluidized bed furnace 1 by the gas recirculation blower 40.
- the flue gas returned to the fluidized bed furnace 1 by the flue gas recirculation system 4 is used as a fluidizing gas (primary combustion gas), a secondary combustion gas, and a tertiary combustion gas.
- the fluidized bed furnace 1 shown in FIG. 2 is an operation control device for controlling the operation of the fluidized bed furnace 1 and a furnace main body 10 provided with a combustion chamber comprising a fluidized bed portion 11 at the lower part of the furnace and a freeboard portion 12 above it. It is equipped with 15. At the lower portion of the freeboard portion 12, there is a throttle portion 13 in which the gas passage cross-sectional area is narrowed as compared with the remaining portion of the combustion chamber. In the freeboard portion 12, the combustion gas flows upward from the bottom, and in the flue connected to the upper portion of the freeboard portion 12, a heat transfer pipe constituting the heat exchange device 31 is installed.
- FIG. 3 is an enlarged view of the fluidized bed portion 11.
- the fluidized bed 11 is filled with a fluidized bed 51 filled with a fluidized medium such as silica sand, and a fluidizing gas supply device 52 for supplying a fluidizing gas to the fluidized bed 51 from its bottom.
- An internal circulating fluidized bed is formed by the partition walls 41 and 42 which divide the fluidized bed 51 into three cells 61, 62 and 63.
- the first partition wall 41 divides the lower portion of the furnace main body 10 including the fluidized bed portion 11 into a combustion area 53 and a heat recovery area 54.
- the second partition wall 42 is provided close to the first partition wall 41 and in parallel with the first partition wall 41 in the heat recovery region 54.
- the fluidized bed portion 11 is formed by the partition walls 41 and 42 between the first side wall 10 a of the furnace main body 10 and the first partition wall 41, the “combustion cell 61”, the first partition wall 41 and the second Three cells of “circulating cell 62” formed between partition wall 42 and “heat collecting cell 63” formed between second partition wall 42 and second side wall 10 b of furnace main body 10 It is divided.
- the heat collection cell 63 is provided with a heat transfer pipe 64 such as a superheater pipe or an evaporator pipe. Heat recovery is performed by the heat medium passing through the heat transfer tube 64.
- a combustion chamber extending linearly in the vertical direction is formed above the combustion area 53.
- a ceiling wall 43 closing the upper portion of the heat recovery area 54 is provided above the heat recovery area 54.
- the upper end of the first partition wall 41 is close to the ceiling wall 43, and an upper communication port serving as an unburned gas supply port 68 is formed between the upper end of the first partition wall 41 and the ceiling wall 43.
- the lower end of the first partition wall 41 is higher than the lower end of the second partition wall 42, whereby a lower communication port 55 through which the fluid medium flows is formed in the lower portion of the first partition wall 41.
- communication ports 56, 57 are formed, which communicate the circulation cell 62 with the heat collecting cell 63 and through which the fluid medium flows.
- the flow gas supply device 52 supplies the flow gas whose flow rate is independently adjusted to each of the combustion cell 61, the circulation cell 62, and the heat collection cell 63.
- one or a plurality of air diffusers 80 having a large number of blowout ports opened to the side are provided.
- Each aeration tube 80 is disposed below the lower ends of the first partition wall 41 and the second partition wall 42.
- the flow gas supply device 52 includes a wind box disposed at the bottom of each of the cells 61, 62, 63, and a gas dispersion plate provided to close the top of the wind box. You may have (all are not shown).
- the air diffusion pipe 80 is connected by a header for each of the cells 61, 62, 63, and each header is a flow provided with flow rate adjusting means 81a, 82a, 83a such as a damper (or valve) and flowmeters 81b, 82b, 83b.
- the gas supply pipes 81, 82, 83 are connected.
- Air is supplied by the pushing blower 79.
- an exhaust gas recirculation system 4 is connected to a flow gas supply pipe 83 connected to the air diffusion pipe 80 disposed at the bottom of the heat collection cell 63.
- the operation control device 15 supplies gas for flow based on detection values of temperature sensors (not shown) for detecting the temperatures of the combustion cells 61 and the heat collecting cells 63 in the fluidized bed 51 and the flowmeters 81b, 82b, 83b, etc.
- the flow rate adjusting means 81a, 82a, 83a are operated to adjust the flow rate of the flowing gas in the pipes 81, 82, 83. From the bottom of the combustion cell 61 and the circulation cell 62, air is blown out as a flow gas, and from the bottom of the heat collection cell 63, combustion exhaust gas is blown out as a flow gas.
- the superficial velocity of the flowable gas of the combustion cell 61 is larger than the superficial velocity of the flowable gas of the heat collection cell 63, and the superficial velocity of the flowable gas of the circulation cell 62 is equal to that of the combustion cell 61.
- the flow rate of the flowable gas is adjusted to be greater than the superficial velocity of the flowable gas and the superficial velocity of the flowable gas of the heat collection cell 63.
- the flow of the fluid medium occurs such that the fluid medium of the heat collection cell 63 is circulated to the combustion cell 61 and the circulation cell 62 through the lower communication port 57 of the second partition wall 42 after moving to the heat collection cell 63.
- the heat energy of the flowable medium having a high temperature in the combustion cell 61 is extracted to the outside in the heat collection cell 63, and the flowable medium having the lowered temperature is returned to the combustion cell 61.
- the temperature rise of the fluid medium of the combustion cell 61 is suppressed.
- a fuel inlet 65 is opened immediately above the surface layer portion of the fluidized bed portion 11 at the time of operation and in the first side wall 10a.
- the fuel inlet 65 is located on the upstream side of the flow of the combustion gas than the throttle portion 13.
- Fuel is supplied to the fuel inlet 65 by a fuel supply device (not shown). The fuel introduced into the furnace from the fuel inlet 65 falls to the top of the combustion cell 61 of the fluidized bed portion 11.
- an unburned gas supply port 68 is opened. From the unburned gas supply port 68, the mixture of air and combustion exhaust gas which is blown out from the aeration pipe 80 disposed in the fluidized bed 51 of the heat recovery area 54 into the fluidized bed 51 and passes through the fluidized bed 51 , As a secondary combustion gas.
- a plurality of stages of tertiary combustion gas supply ports 69 are opened on the furnace wall on the downstream side of the flow of combustion gas than the unburned gas supply port 68.
- the multiple stages of tertiary combustion gas supply ports 69 are dispersed at a plurality of height positions, in other words, dispersed in the flow direction of the combustion gas.
- Flow control means 88, 89 such as dampers (or valves) are provided in the air supply path to each of the tertiary combustion gas supply ports 69 and the supply path of the combustion exhaust gas.
- a temperature sensor 70 is provided on the furnace wall included in the diffusion area of the tertiary air blown out from the tertiary combustion gas supply port 69.
- the operation method of the fluidized bed furnace 1 of the said structure is demonstrated.
- low air ratio combustion is performed in the fluidized bed portion 11. More specifically, while the total air ratio between the fluidized bed portion 11 and the freeboard portion 12 is set to a value larger than 1, the air ratio (i.e., the primary air ratio) of the combustion cells 61 of the fluidized bed portion 11 and the fuel injection
- the air content is adjusted.
- the primary air ratio is lower than the secondary air ratio.
- the primary air ratio may be 0.4 and the secondary air ratio may be 0.8.
- the slow drying and thermal decomposition of the fuel generate combustible pyrolysis gas and pyrolysis residue.
- Pyrolysis residue and fuel residue are at the bottom of the combustion cell 61, and are provided at the intermediate position between the first side wall 10a and the first partition wall 41 from the outlet 72 of the fluid medium and the incombustible material. It is discharged outside.
- the pyrolysis gas generated in the fluidized bed portion 11 is burned with the secondary combustion gas, the unburned portion in the combustion gas is completely burned with the tertiary combustion gas, and the combustion exhaust gas is discharged to the combustion exhaust gas system 3 Ru.
- the unburned content of the fuel in the combustion cell 61 (unburned char) compared to the case where the air ratio is 1 or more.
- the percentage of is large.
- the ratio of unburned char in the combustion cell 61 is particularly high as compared with the case where the conventional air ratio is about 0.8 to 0.9. growing.
- the unburned char of the combustion cell 61 may move from the combustion cell 61 to the heat collection cell 63 by the circulation of the fluid medium. However, it is not desirable that the combustion reaction occurs in the heat collecting cell 63.
- the combustion exhaust gas having an oxygen concentration lower than that of air is used as a gas for fluidization of the heat collection cell 63, and the air temperature of the heat collection cell 63 is lower than that of the combustion cell 61 or the circulation cell 62.
- the combustion reaction of the unburned char in the heat collection cell 63 is suppressed.
- the fluidized bed furnace 1 is provided with a secondary combustion gas supply unit 86 for blowing the secondary combustion gas whose oxygen concentration is adjusted by the combustion exhaust gas generated by the freeboard unit 12 into the freeboard unit 12.
- the air ratio of the upstream portion of the board portion 12 is suppressed to less than one.
- the secondary combustion gas supply unit 86 blows in the secondary combustion gas including the combustion exhaust gas having a lower oxygen concentration than air into the freeboard unit 12, and the local and rapid combustion reaction in the freeboard unit 12. And abnormal combustion is suppressed.
- the secondary combustion gas supply unit 86 directs the secondary combustion gas to a position downstream of the flow of combustion gas from the fuel inlet 65 of the freeboard 12 and adjacent to the fuel inlet 65. It includes an unburned gas supply port 68 for blowing.
- a position adjacent to the fuel inlet 65 means the periphery of the fuel inlet 65, in particular the unburned component in the gas due to the fine powder and its volatile matter that risend from the fuel introduced from the fuel inlet 65.
- the secondary combustion gas is blown from the unburned gas supply port 68 toward the throttle 13 immediately downstream of the flow of the combustion gas at the fuel inlet 65. Since the secondary combustion gas blown from the unburned gas supply port 68 to the freeboard 12 contains a large amount of combustion exhaust gas whose oxygen concentration is further reduced by passing through the heat collection cell 63, fuel can be injected more effectively. It is expected that the combustion reaction of the mouth 65 and its surroundings is suppressed.
- the tertiary combustion gas is blown into the downstream side of the flow of combustion gas from the unburned gas supply port 68 of the freeboard portion 12 with the tertiary combustion gas whose oxygen concentration is adjusted by the combustion exhaust gas.
- a supply unit 87 is provided.
- the third combustion gas containing the combustion exhaust gas having a lower oxygen concentration than the air is blown to the downstream side of the flow of the combustion gas than the unburned gas supply port 68 of the freeboard portion 12.
- the combustion of the flammable gas in the combustion chamber becomes slow, and local and rapid combustion reactions can be suppressed.
- the tertiary combustion gas has a higher oxygen concentration than the secondary combustion gas.
- the tertiary combustion gas supply unit 87 includes a plurality of tertiary combustion gas supply ports 69 dispersed in the flow direction of the combustion gas, a temperature sensor 70 for detecting the temperature of the diffusion region of the blown tertiary combustion gas, and a temperature
- the operation control apparatus 15 which adjusts the oxygen concentration of the gas for tertiary combustion based on the detected value of the sensor 70 is included.
- the temperature of the diffusion region of the tertiary combustion gas blown out from each tertiary combustion gas supply port 69 is detected by the temperature sensor 70, and the operation control device 15 causes each tertiary to fall within the predetermined range.
- the oxygen concentration of the tertiary combustion gas blown from the combustion gas supply port 69 is adjusted.
- the operation control device 15 adjusts the oxygen concentration of the tertiary combustion gas by changing the mixing ratio of the air and the combustion exhaust gas by changing the opening degree of the flow rate adjusting means 88, 89.
- the operation control device 15 maintains the flow rate of the tertiary combustion gas at the predetermined flow rate, and supplies the tertiary combustion gas to that point.
- the flow rate adjusting means 88, 89 are opened so that the oxygen concentration of the tertiary combustion gas supplied to that point is increased. Adjust the degree.
- tertiary combustion gas having a higher oxygen concentration is supplied toward the downstream side of the flow of combustion gas. That is, the tertiary combustion gas having a high oxygen concentration is supplied to the downstream side of the flow of the combustion gas having a large amount of unburned combustion gas. As a result, the combustion of the flammable gas in the freeboard portion 12 becomes slow, and local and rapid combustion reaction can be suppressed.
- the gas for secondary combustion is blown into the freeboard portion 12 from the unburned gas supply port 68, but additionally or alternatively, the gas for secondary combustion is a fuel It may be supplied from the fuel inlet 65 in a mixed state with
- the secondary combustion gas supply unit 86 reaches the fuel inlet 65 so that the secondary combustion gas is supplied from the fuel inlet 65 in a state of being mixed with the fuel.
- a fuel chute purge gas supply pipe 67 for supplying the secondary combustion gas to the supply path 66 is included.
- the fuel is introduced into the freeboard portion 12 along with the secondary combustion gas, so it is possible to suppress the local and rapid combustion reaction around the fuel inlet 65 and the periphery thereof.
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Abstract
Description
燃料を燃焼させる流動床部と、
前記流動床部の上方に位置するフリーボード部と、
前記フリーボード部に前記燃料を投入する燃料投入口と、
前記燃料の前記フリーボード部における異常燃焼を抑制させるように、前記フリーボード部で生成された燃焼排ガスにより酸素濃度が調整された二次燃焼用ガスを前記フリーボード部へ吹き込む二次燃焼用ガス供給部と、を備えたものである。
まず、本発明の一実施形態に係る流動床炉1を含む燃焼システム100の構成について説明する。図1に示す燃焼システム100は、石炭、バイオマス、RDF、都市ごみ、産業廃棄物などの燃料(燃焼対象物)を燃焼して、その排熱を回収するシステムである。
次に、本発明の一実施形態に係る流動床炉1の構成について説明する。図2に示す流動床炉1は、炉下部の流動床部11及びその上方のフリーボード部12からなる燃焼室が設けられた炉本体10と、流動床炉1の運転を制御する運転制御装置15と備えている。フリーボード部12の下部には、燃焼室の余の部分と比較してガス通路断面積が絞られた絞り部13が存在する。フリーボード部12では、燃焼ガスが下から上に向かって流れ、フリーボード部12の上部に接続された煙道には、熱交換装置31を構成する伝熱管が設置されている。
ここで、上記構成の流動床炉1の運転方法について説明する。流動床炉1では、流動床部11において低空気比燃焼が行われる。より詳細には、流動床部11とフリーボード部12との総空気比を1よりも大きい値としながら、流動床部11の燃焼セル61の空気比(即ち、一次空気比)、及び燃料投入口65の周囲の空気比(二次空気比)がいずれも1未満の低空気比となるように、燃焼セル61への流動化空気及び二次燃焼用ガスの供給量、及び/又は、その空気含有量が調整される。望ましくは、一次空気比は、二次空気比よりも低い。例えば、流動床部11とフリーボード部12との総空気比を1.2とする場合に、一次空気比を0.4とし、二次空気比を0.8としてよい。
3 :燃焼排ガス系統
4 :排ガス再循環系統
10 :炉本体
10a :第1側壁
10b :第2側壁
11 :流動床部
12 :フリーボード部
13 :絞り部
15 :運転制御装置
31 :熱交換装置
32 :サイクロン式集塵機
33 :バグフィルタ
34 :誘引ブロワ
40 :ガス再循環ブロワ
41 :第1仕切壁
42 :第2仕切壁
43 :天井壁
51 :流動層
52 :流動用ガス供給装置
53 :燃焼領域
54 :熱回収領域
55,56,57 :連通口
61 :燃焼セル
62 :循環セル
63 :収熱セル
64 :伝熱管
65 :燃料投入口
66 :燃料供給経路
67 :燃料シュートパージガス供給管
68 :未燃ガス供給口
69 :三次燃焼用ガス供給口
70 :温度センサ
72 :抜出口
79 :押込ブロワ
80 :散気管
81,82,83 :流動用ガス供給配管
81a,82a,83a :流量調整手段
81b,82b,83b :流量計
86 :二次燃焼用ガス供給部
87 :三次燃焼用ガス供給部
88,89 :流量調整手段
100 :燃焼システム
Claims (6)
- 燃料を燃焼させる流動床部と、
前記流動床部の上方に位置するフリーボード部と、
前記フリーボード部に前記燃料を投入する燃料投入口と、
前記燃料の前記フリーボード部における異常燃焼を抑制させるように、前記フリーボード部で生成された燃焼排ガスにより酸素濃度が調整された二次燃焼用ガスを前記フリーボード部へ吹き込む二次燃焼用ガス供給部と、を備えた
流動床炉。 - 前記二次燃焼用ガス供給部が、前記フリーボード部の前記燃料投入口よりも燃焼ガスの流れの下流側で且つ前記燃料投入口に隣接した位置へ向けて、前記二次燃焼用ガスを吹き込む未燃ガス供給口を含む、
請求項1の流動床炉。 - 前記二次燃焼用ガス供給部は、前記二次燃焼用ガスが前記燃料と混合した状態で前記燃料投入口から供給されるように、前記燃料投入口へ至る燃料供給経路へ前記二次燃焼用ガスを供給する燃料シュートパージガス供給管を含む、
請求項1の流動床炉。 - 前記燃焼排ガスによって酸素濃度が調整された、前記二次燃焼用ガスよりも酸素濃度が高い三次燃焼用ガスを、前記フリーボード部の前記二次燃焼用ガス供給部よりも燃焼ガスの流れの下流側へ吹き込む三次燃焼用ガス供給部を、更に備えた、
請求項1に記載の流動床炉。 - 前記三次燃焼用ガス供給部は、燃焼ガスの流れの下流側ほど酸素濃度が高い三次燃焼用ガスを供給する、燃焼ガスの流れ方向に分散した複数段の三次燃焼用ガス供給口を含む、
請求項4に記載の流動床炉。 - 前記三次燃焼用ガス供給部は、吹き込まれた前記三次燃焼用ガスの拡散領域の温度を検出する温度センサと、前記温度センサの検出値に基づいて、空気に対する前記燃焼排ガスの混合量を変化させることにより、前記温度センサの検出値が所定の範囲内となるように前記三次燃焼用ガスの酸素濃度を調整する制御装置とを、含む、
請求項4又は5に記載の流動床炉。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BR112020010590-2A BR112020010590A2 (pt) | 2017-11-29 | 2018-11-28 | Forno de leito fluidizado e método para operar o mesmo |
CN201880076311.2A CN111602003B (zh) | 2017-11-29 | 2018-11-28 | 流化床炉及其运转方法 |
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BR112020010590A2 (pt) | 2020-12-29 |
JP7103781B2 (ja) | 2022-07-20 |
CN111602003A (zh) | 2020-08-28 |
JP2019100576A (ja) | 2019-06-24 |
CN111602003B (zh) | 2022-09-30 |
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