TW201812214A - Solid fuel burner - Google Patents

Abstract

This solid fuel burner is provided with: a fuel nozzle 2 through which a fluid mixture of a solid fuel and a carrier gas flows, the opening shape of the fuel nozzle 2 being flat; a secondary air nozzle 4 that is located on the outer peripheral side of the fuel nozzle 2, a guide sleeve 13 being provided to the outer periphery of the tip of the secondary air nozzle 4, and the opening shape of the secondary air nozzle 4 being flat; and a tertiary air nozzle 7 that is located on the outer peripheral side of the secondary air nozzle 4 and comprises a horizontal part 7a and a slanted part 7b, the opening shape of the tertiary air nozzle 7 being cylindrical. On the outlet side of the solid fuel burner, inside the tertiary air nozzle 7, a guide vane 14 for guiding tertiary air to the outer peripheral side is supported by a support member 15 on the inner wall of the tertiary air nozzle 7. Due to this support configuration, the portion extracted during maintenance of the burner ends at the secondary air nozzle 4, ease of maintenance is excellent, and the gap between the guide vane 14 and the tertiary air nozzle 7 can be reduced. Therefore, as pertains to a burner configured such that combustion gas, which jets out from the outer periphery of a fuel-containing fluid stream, spreads radially outward, it is possible to provide a solid fuel burner with which increases in Nox concentration are better prevented and ease of maintenance is exceptional.

Description

固體燃料燃燒器Solid fuel burner

[0001] 本發明是關於：固體燃料燃燒器，尤其是關於：可減少因燃燒所產生的氮氧化物量，而且維修方便性也優異的固體燃料燃燒器的構造。[0001] The present invention relates to a solid fuel burner, and more particularly, to a structure of a solid fuel burner that can reduce the amount of nitrogen oxides generated by combustion and has excellent ease of maintenance.

[0002] 就燃燒煤炭之類的固體燃料（以下的說明中，有時候稱：粉煤）的鍋爐等的燃燒裝置而言，基於環保的理由，被要求必須降低因燃料燃燒所產生的氮氧化物（以下的說明中，有時候稱：NO_x ）的濃度。 　　[0003] 關於在火焰內進行脫硝反應（除去氮氧化物）之低NO_x 燃燒器，已知的燃燒器的構造，其中有一種是從燃料噴嘴噴出燃料（亦即，含燃料流體的噴流），又從該含燃料流體的噴流的外周噴出空氣（亦即，燃燒用氣體），並且將該空氣朝徑向外方擴散。 　　[0004] 第9圖係顯示傳統的粉煤燃燒器的側面圖（局部為剖面）。 　　燃料噴嘴22是連接於基部側並未圖示出來的載送管，而將固體燃料與載送用的一次空氣一起噴射出去。在燃料噴嘴22的外周，設置有可形成二次空氣（燃燒用空氣）的流路25之二次空氣噴嘴24，並且在二次空氣噴嘴24的外周，設置有可形成三次空氣（燃燒用空氣）的流路26之三次空氣噴嘴27。而二次空氣流路25以及三次空氣流路26則是連通於風箱23。 　　[0005] 從燃燒器出口側的正面來觀看：燃料噴嘴22與二次空氣噴嘴24與三次空氣噴嘴27的話，可以看出是以燃料噴嘴22為中心，在其外側則是呈同心圓狀配置有環狀的二次空氣噴嘴24，並且在二次空氣噴嘴24的外側也是呈同心圓狀配置有環狀的三次空氣噴嘴27。三次空氣噴嘴27是構成位於最外周的空氣噴嘴。 　　[0006] 在燃料噴嘴22的內部，係設置有貫穿著燃料噴嘴22的點火燃燒器21，當燃燒器啟動時或低負荷燃燒時，點火燃燒器21可用來助燃。在燃料噴嘴22的出口前端，設置有：用來將一次空氣與二次空氣之間的循環流40予以擴大的火焰穩定器32。三次空氣噴嘴27的分隔壁，就是利用火爐10的壁9所構成的燃燒器咽喉部的分隔壁。在二次空氣噴嘴24的出口前端，設置有：相對於燃燒器中心軸C，係朝往徑向擴管的導引構件33。二次空氣噴嘴24是利用：安裝於燃料噴嘴22的外壁的支承板35而被固定。 　　[0007] 位於二次空氣噴嘴24前端的導引構件33，主要是用來將三次空氣以遠離燃燒器中心軸C的方式朝向外方噴出。此外，在三次空氣流路26又設置有導引構件34。這個導引構件34利用支承板36來進行固定，而支承板36的另一端則是固定在二次空氣噴嘴24的外壁上。 　　[0008] 二次空氣流以及三次空氣流是利用二次空氣噴嘴24和三次空氣噴嘴27內的導引構件33、34，而被朝向遠離燃燒器中心軸C側的方向噴出，因此，將會在其下游側形成循環流40。此外，又利用位於燃料噴嘴22的出口前端的火焰穩定器32，來將循環流40加以擴大。在這個循環流40內係有高溫的氣體滯留其中，因此，燃料粒子的著火將會不斷進展，可提昇火焰的穩定性。將燃料滯留在高溫且缺氧的火焰內，使得燃料中所含有的氮氣成分轉換成氨氣或氰氣之類的還原劑而釋放出來，進而又將NO_x 還原成氮氣。關於上述構造的燃燒器的記載，可見於下列的專利文獻1所記載的固體燃料燃燒器。 　　[0009] 在具備有複數個固體燃料燃燒器的鍋爐之類的燃燒裝置中，增加燃燒器的容量的作法，是用來削減成本以及因削減燃燒器的支數而可提昇運用性之有效的作法，但是，隨著燃燒器容量的擴大而使得火焰也變大的話，未著火領域將會擴大。未著火領域的擴大，係意味著：著火後的燃燒時間變短，將不足以抑制NO_x 的生成，也是導致燃燒效率變差的原因之一。 　　[0010] 因此，下列的專利文獻2所揭示的燃燒器的發明，是將燃料噴嘴形狀做成扁平形狀，以謀求既可擴大燃燒器容量，又可擴大含燃料流體的噴出流之截面積，而得以降低流速，並且將燃料之未著火距離予以縮小。 　　[0011] 此外，下列的專利文獻3所揭示的燃燒器的發明，是將上述專利文獻2的燃燒器構造加以改良，是將燃料噴嘴的截面形狀製作成：在抵達文氏管的流路縮頸部之前，是作成圓形，在從文氏管的流路縮頸部起迄噴嘴開口部為止，是逐漸地增大扁平度，而在開口部則具有最大的扁平度。 　　[0012] 此外，下列的專利文獻4所揭示的燃燒器的發明，是將上述專利文獻2的燃燒器構造加以改良，將位於燃料噴嘴外周的二次燃燒用氣體（二次空氣）噴嘴的截面形狀，在出口部是作成扁平形狀，並且將位於二次燃燒用氣體噴嘴外周的三次燃燒用氣體（三次空氣）噴嘴的截面形狀，於火爐壁面的開口部是作成圓形。這個文獻是揭示出：在三次燃燒用氣體噴嘴內，並且是在二次燃燒用氣體噴嘴的外周中的上部與下部，設置有三次燃燒用氣體的導引板之結構。 　　[0013] 根據前述專利文獻2所揭示的發明，係可縮小燃料之未著火距離，因而可確保著火後的燃燒時間。又，根據前述專利文獻3所揭示的發明，是流路在文氏管的流路縮頸部變成縮流之後，流路再度被擴大，因此，在噴嘴內壁旁邊的含燃料流體的燃料濃度分布係被均一化。 　　[0014] 藉由將燃燒用氣體朝徑向外方擴散的作法，可使得在燃料噴嘴出口所形成的火焰與三次空氣之類的燃燒用氣體，不會馬上的混合在一起，而將形成：在燃料噴流與外周空氣噴流之間產生循環流之循環領域，因而發生爐內的氣體逆流至燃燒器旁邊的現象。在這個領域中，因為燃燒氣體滯留於此，因此氧氣濃度很低，原本因為在燃料噴嘴出口所形成的火焰而生成的NO_x 將會在這個領域中被還原。在以下的說明中，係將這個領域稱為：還原領域。 　　[0015] 在低NO_x 燃燒器中，為了促進將NO_x 還原成氮氣的作用，必須在燃燒器近旁形成高溫且空氣不足的還原領域。根據前述專利文獻4所揭示的發明，是將三次燃燒用氣體流路分割成上下兩部分，並且對於流經上下兩部分的流路內的空氣，賦予朝向火爐之上下方向不同的速度成分，而使火焰產生偏向，以擴大NO_x 的還原領域，藉以謀求可在燃燒器的低負荷時也能夠達成低NO_x 燃燒。 [先前技術文獻] [專利文獻] 　　[0016] 　　[專利文獻1] 日本特開2006-189188號公報 　　[專利文獻2] 國際公開第2008/038426號手冊 　　[專利文獻3] 日本特許第5867742號公報 　　[專利文獻4] 日本特許第5908091號公報[0002] Combustion devices such as boilers that burn solid fuels such as coal (hereinafter sometimes referred to as pulverized coal) are required to reduce nitrogen oxides generated by fuel combustion for environmental reasons. (hereinafter, the description sometimes called: NO _x) concentration. [0003] Low NO _x burners on denitration reaction (removing nitrogen oxides) in the flame, the burner of known construction, of which one is discharging fuel (i.e., fuel-containing fluid ejection flow of the fuel from the nozzle ), Injecting air (ie, combustion gas) from the outer periphery of the jet containing the fuel fluid, and diffusing the air radially outward. [0004] FIG. 9 is a side view (partially in section) showing a conventional pulverized coal burner. The fuel nozzle 22 is connected to a carrier pipe (not shown) on the base side, and injects solid fuel together with primary air for carrier. On the outer periphery of the fuel nozzle 22, a secondary air nozzle 24 capable of forming a flow path 25 of secondary air (combustion air) is provided. On the outer periphery of the secondary air nozzle 24, a third air formation (combustion air) is provided. ) Flow path 26 tertiary air nozzle 27. The secondary air flow path 25 and the tertiary air flow path 26 communicate with the bellows 23. [0005] Viewed from the front of the burner outlet side: when the fuel nozzle 22, the secondary air nozzle 24, and the tertiary air nozzle 27 are located, it can be seen that the fuel nozzle 22 is the center, and the outer side is arranged concentrically. An annular secondary air nozzle 24 is provided, and an annular tertiary air nozzle 27 is also arranged concentrically on the outside of the secondary air nozzle 24. The tertiary air nozzle 27 is an air nozzle located at the outermost periphery. [0006] An ignition burner 21 penetrating the fuel nozzle 22 is provided inside the fuel nozzle 22, and the ignition burner 21 can be used to assist combustion when the burner is activated or is burned at a low load. A flame stabilizer 32 is provided at the front end of the outlet of the fuel nozzle 22 to expand the circulating flow 40 between the primary air and the secondary air. The partition wall of the tertiary air nozzle 27 is the partition wall of the throat of the burner constituted by the wall 9 of the stove 10. At the front end of the outlet of the secondary air nozzle 24, a guide member 33 that expands the tube in the radial direction with respect to the combustor central axis C is provided. The secondary air nozzle 24 is fixed by a support plate 35 attached to the outer wall of the fuel nozzle 22. [0007] The guide member 33 located at the front end of the secondary air nozzle 24 is mainly used to eject the tertiary air away from the center axis C of the burner toward the outside. In addition, a guide member 34 is provided in the tertiary air flow path 26. This guide member 34 is fixed by a support plate 36, and the other end of the support plate 36 is fixed on the outer wall of the secondary air nozzle 24. [0008] The secondary air flow and the tertiary air flow are ejected in a direction away from the central axis C side of the burner by using the guide members 33 and 34 in the secondary air nozzle 24 and the tertiary air nozzle 27. A circulating flow 40 is formed on its downstream side. In addition, the flame stabilizer 32 located at the front end of the outlet of the fuel nozzle 22 is used to expand the circulating flow 40. A high-temperature gas is trapped in the circulating flow 40, so the ignition of fuel particles will continue to progress, which can improve the stability of the flame. The fuel is held in a high-temperature and oxygen-deficient flame, so that the nitrogen component contained in the fuel is converted into a reducing agent such as ammonia or cyanogen and released, and then NO _{x is} reduced to nitrogen. The description of the burner having the above-mentioned structure can be found in the solid fuel burner described in Patent Document 1 below. [0009] In a combustion device such as a boiler having a plurality of solid fuel burners, the method of increasing the capacity of the burner is effective for reducing costs and improving the operability by reducing the number of burners. However, if the flames become larger as the burner capacity increases, the unfired area will expand. To expand the field of unfired, based means: a combustion time after ignition is shortened, will be insufficient to suppress the generation of NO _x, it is one of the causes of deterioration in combustion efficiency. [0010] Therefore, the invention of the burner disclosed in the following Patent Document 2 is to make the shape of the fuel nozzle into a flat shape so as to increase both the burner capacity and the cross-sectional area of the jet stream containing the fuel fluid. This reduces the flow rate and reduces the unfired distance of the fuel. [0011] In addition, the invention of the burner disclosed in the following Patent Document 3 is to improve the burner structure of the above Patent Document 2 and to make the cross-sectional shape of the fuel nozzle so that the flow path that reaches the venturi tube shrinks. Before the neck, it is rounded, and the flatness is gradually increased from the neck of the venturi to the opening of the nozzle, and the flatness is maximized at the opening. [0012] In addition, the invention of the burner disclosed in the following Patent Document 4 is an improvement of the burner structure of the above Patent Document 2 and a cross section of a secondary combustion gas (secondary air) nozzle located on the outer periphery of the fuel nozzle. The shape is a flat shape at the exit portion, and the cross-sectional shape of the tertiary combustion gas (tertiary air) nozzle located on the outer periphery of the secondary combustion gas nozzle is rounded at the opening portion of the furnace wall surface. This document discloses a structure in which a guide plate for tertiary combustion gas is provided in the tertiary combustion gas nozzle, and in the upper and lower portions of the outer periphery of the secondary combustion gas nozzle. [0013] According to the invention disclosed in the aforementioned Patent Document 2, since the unfired distance of the fuel can be reduced, the burning time after the fire can be secured. In addition, according to the invention disclosed in the aforementioned Patent Document 3, the flow path is expanded again after the flow path shrinks in the flow path of the venturi tube, and the flow path is enlarged again. Therefore, the fuel concentration of the fuel-containing fluid near the inner wall of the nozzle is increased. The distribution system is homogenized. [0014] By diffusing the combustion gas radially outward, the flame formed at the fuel nozzle outlet and the combustion gas such as tertiary air will not be immediately mixed together, and will form: The circulation area where a circulating flow is generated between the fuel jet and the peripheral air jet causes a phenomenon in which the gas in the furnace flows back to the side of the burner. In this field, because the combustion gas stays here, the oxygen concentration is very low, and the NO _x originally generated by the flame formed at the fuel nozzle outlet will be reduced in this field. In the following description, this field is referred to as the reduction field. [0015] In the low-NO _x burners, in order to facilitate reducing NO _x to nitrogen role must be formed near the burner and a high temperature air is insufficient to restore the art. According to the invention disclosed in the aforementioned Patent Document 4, the tertiary combustion gas flow path is divided into upper and lower parts, and air flowing through the upper and lower parts of the flow path is provided with different velocity components toward the upper and lower directions of the furnace, and flame generation biased to expand the field of reduction of NO _x, thereby seeking to be at low loads of the burner can be achieved even a low NO _x combustion. [Prior Art Document] [Patent Document] [0016] [Patent Document 1] Japanese Patent Application Publication No. 2006-189188 [Patent Document 2] International Publication No. 2008/038426 [Patent Document 3] Japanese Patent No. 5867742 [ Patent Document 4] Japanese Patent No. 5908091

[發明所欲解決的技術課題] 　　[0017] 根據上述專利文獻等所揭示的發明，是將燃料噴嘴形狀作成扁平，以資縮短：從含燃料流體的噴流表面之著火領域起迄該噴流的中心部為止的距離，藉此，可縮小未著火領域。從而，降低NO_x 濃度的效果也高。 　　[0018] 尤其是在位於燃料噴嘴的最外側的三次燃燒用氣體噴嘴內的出口外周，又設置有可將燃燒用氣體朝徑向外方擴展的導引構件（例如：第9圖所示的導引構件34），來形成前述的還原領域，可更提高用來降低NO_x 濃度的效果。專利文獻4所記載的燃燒器是揭示出：藉由將三次空氣導引板設置在二次空氣噴嘴的外周部，而可將燃燒用氣體（空氣）導引到外周側的結構。 　　[0019] 前述三次空氣導引板之類的導引構件，是被支承固定在位於其內側的二次燃燒用氣體噴嘴的外壁，也就是燃料噴嘴側（燃燒器中心軸側）。在執行燃燒器的保養維修時，是必須將燃料噴嘴從火爐卸下取出，這個時候，必須從燃燒器中心軸將包含導引構件在內的燃燒器部分，予以卸下取出到爐外。必須卸下取出的部分愈大的話，將會愈增加保養維修時作業上的負擔。 　　[0020] 此外，考慮到燃燒器構造體的製作公差和因火焰的輻射熱所導致的變形之類的因素，一般而言，導引構件的外徑，是製作成比火爐開口部的壁面的直徑略小一點。 　　若將導引構件的外徑製作成：比火爐開口部的壁面的直徑略小一點的話，導引構件與壁面的間隙將會變大，因此，燃燒器軸方向上的直進流的比率將會增加而會將循環流予以破壞掉。如此一來，循環流將會變小，所以前述還原領域也會縮小，而會有導致NO_x 濃度增加之虞慮。 　　[0021] 本發明的技術課題，是要提供：一種可謀求防止NO_x 濃度增加之固體燃料燃燒器，是具有：可將從含燃料的流體噴流的外周噴出的燃燒用氣體，朝徑向外方擴散的結構的燃燒器，並且維修方便性也優異。 [用來解決課題之技術方案] 　　[0022] 為了達成上述本發明的技術課題，係可藉由下列的構成方式來達成。 　　本案的申請專利範圍第1項所述的發明，係一種固體燃料燃燒器，其是具備：第一氣體噴嘴（2）、第二氣體噴嘴（4）以及第三氣體噴嘴（7）的固體燃料燃燒器，該第一氣體噴嘴（2），係具有可供固體燃料與該固體燃料的載送氣體之混合流體流動的筒狀流路，並且面向火爐壁面的開口形狀是呈扁平形狀；該第二氣體噴嘴（4），係構成：與可供前述固體燃料的燃燒用氣體流動之風箱（3）相連通，且形成在前述第一氣體噴嘴（2）的外周側之第一燃燒用氣體流路（5），並且開口形狀呈扁平形狀，同時，在前端外周設置有用以將燃燒用氣體從燃燒器中心軸側導引到外周側的第一導引構件（13）；該第三氣體噴嘴（7），係構成：與可供前述固體燃料的燃燒用氣體流動之風箱（3）相連通，且形成在前述第二氣體噴嘴（4）的外周側之第二燃燒用氣體流路（6），並且開口形狀呈圓筒狀，同時，其通過燃燒器中心軸的截面係由：沿著燃燒器中心軸方向的水平部（7a）與從該水平部（7a）朝火爐方向擴大直徑的傾斜部（7b）所形成的，其中，在前述第二燃燒用氣體流路（6）的出口側，設置有：用以將燃燒用氣體從燃燒器中心軸側導引到外周側之第二導引構件（14），並且將用來支承固定該第二導引構件（14）的支承構件（15）設置在第三氣體噴嘴（7）的內壁。 　　[0023] 本案的申請專利範圍第2項所述的發明，是針對於申請專利範圍第1項所述的固體燃料燃燒器，其中，前述第二導引構件（14）是分別設置在第二氣體噴嘴（4）的上側與下側。 　　本案的申請專利範圍第3項所述的發明，是針對於申請專利範圍第1項或第2項所述的固體燃料燃燒器，其中，前述風箱（3）的分隔壁（18）的一部分，是設置成可與該分隔壁（18）進行分離之板狀構件（17），前述第一氣體噴嘴（2）與第二氣體噴嘴（4），是製作成：與前述板狀構件（17）形成一體的構造。 　　[0024] 本案的申請專利範圍第4項所述的發明，是針對於申請專利範圍第1項或第2項所述的固體燃料燃燒器，其中，在前述第一氣體噴嘴（2）的前端外周，設有：圍繞在第一氣體噴嘴（2）而形成的火焰穩定器（12），該火焰穩定器（12）之從火爐側朝噴嘴側的投影面，係與第二氣體噴嘴（4）的投影面至少有一部分重疊。 　　[0025] 此處，上述「扁平形狀」係指例如：第5圖（A）所示的長方形、第5圖（B）所示的橢圓形、第5圖（C）所示的半圓形與長方形的組合形狀、第5圖（D）所示的寬幅的多角形之類的形狀，是定義為具有：長徑與短徑；或長邊W與短邊H之扁平形狀。在第5圖（A）中，4個角部的其中一部分或全部是曲線狀也無妨。同樣地，在第5圖（D）中，多角形的角部的其中一部分或全部是曲線狀也無妨。此外，在上述的各形狀中，並不限定：曲線部的曲率是一定的曲率。 　　[0026] （作用） 　　在位於第一氣體噴嘴的最外側處的第三氣體噴嘴內的出口側，將燃燒用氣體的導引構件，亦即將第二導引構件予以利用其內周側的第二氣體噴嘴的壁面來進行支承的話，第二導引構件是被固定在第二氣體噴嘴的外壁上，因此，在實施燃燒器的保養維修時，無需從燃燒器中心軸將包含第二導引構件在內的大小之構造體卸下取出到爐外。 　　[0027] 因為是將第二導引構件利用其外周側的第三氣體噴嘴的內壁進行支承，因此，需卸下取出的部分，縮小為從燃燒器中心軸起迄第二導引構件的內側的第二氣體噴嘴為止的部分而已。 　　[0028] 從而，根據本案的申請專利範圍第1項所述的發明，是從外周側來支承第二導引構件，因此在進行燃燒器的保養維修時，無需將第二導引構件 卸下取出，因而需要卸下取出的部分只要很小即可，保養維修變得容易。如果是從內周側來支承第二導引構件的話，必須考慮到前述變形等的因素，而將第二導引構件的外徑製作成略小一點，且必須加大第二導引構件與火爐開口的壁面的間隙。但是，因為是將導引構件由其外周側來進行支承，因此，可將第二導引構件與壁面的間隙做得比較小，或者可將第二導引構件的直徑做得比壁面的開口直徑更大。 　　[0029] 此外，藉由在扁平形狀的第一氣體噴嘴的外周，設置圓筒狀的第三氣體噴嘴，第二燃燒用氣體流路主要是夾介著第一氣體噴嘴的長徑或長邊而配置在上下方，因此，與第三氣體噴嘴也和第一氣體噴嘴及第二氣體噴嘴同樣地作成扁平形狀的情況相較，可減少燃燒用氣體與燃料發生混合，而可擴大燃燒器中心部的還原領域。 　　[0030] 此外，流經位在第三氣體噴嘴與第二氣體噴嘴之間的較寬廣的上側與下側的流路之燃燒用氣體，與左右側相較，直進性更高。因此，根據本案的申請專利範圍第2項所述的發明，除了具有申請專利範圍第1項所述的發明的作用之外，因為是將第二導引構件分別設在第二氣體噴嘴的上側與下側，因此，也可以將直進性高的燃燒用氣體引導朝向外方。 　　[0031] 此外，風箱的分隔壁的其中一部分是製作成：可從分隔壁本體分離的板狀構件，因此，在進行保養維修時，可容易進行燃燒器的拆卸以及安裝。 　　根據本案的申請專利範圍第3項所述的發明，除了具有申請專利範圍第1項或第2項所述的發明的作用之外，因為又將風箱分隔壁的板狀構件與燃燒器的卸下取出部分，予以製作成一體構造，因此，無需將兩者分別進行拆卸，可同時進行拆卸。 　　[0032] 此外，根據本案的申請專利範圍第4項所述的發明，除了具有申請專利範圍第1項或第2項所述的發明的作用之外，因為是利用設在第一氣體噴嘴的前端外周的火焰穩定器，在其下游側形成循環流，因此，具有可擴大還原領域的作用。 　　[0033] 此外，從火爐側來觀看噴嘴側的情況下，如果火焰穩定器與第二氣體噴嘴的出口分隔壁，至少有一部分重疊的話，就可以防止：第二氣體噴嘴內之燃燒器軸方向上的燃燒用氣體的流動，朝火爐方向直進而穿過去，因此係具有：可在火焰穩定器的下游側，有效率地形成燃燒用氣體的滯留領域（還原領域）而能夠確實地進行著火之作用。 [發明之效果] 　　[0034] 根據本發明的固體燃料燃燒器，係可達成低NO_x 燃燒，也可提昇維修方便性。具體而言，可達成以下所述的效果。 　　根據本案的申請專利範圍第1項所述的發明，係將第二導引構件由其外周側的第三氣體噴嘴的內壁側來進行支承，而可將第二導引構件與第三氣體噴嘴的內壁的間隙做得較小，可減少穿過這個間隙之燃燒用氣體之在燃燒器軸方向上的直進流。因此，可確保形成在燃燒器出口下游的循環流的大小，而可形成充分的還原領域，因此可實現低NO_x 燃燒。此外，在進行燃燒器的保養維修時，只需卸下取出第二導引構件之內周側的構件即可，因此，需要卸下取出的部分變得很小，維修方便性也更趨良好。 　　[0035] 再者，藉由在扁平形狀的第一氣體噴嘴的外周，設置圓筒狀的第三氣體噴嘴，可減少燃燒用氣體與燃料的混合量，而擴大燃燒器中心部的還原領域，更促進低NO_x 燃燒。 　　[0036] 此外，根據本案的申請專利範圍第2項所述的發明，除了具有申請專利範圍第1項所述的發明的效果之外，又將流經第二燃燒用氣體流路之直進性較高的燃燒用氣體，引導朝向外方流動，因此，可實現更低的NO_x 燃燒。 　　[0037] 此外，根據本案的申請專利範圍第3項所述的發明，除了具有申請專利範圍第1項或第2項所述的發明的效果之外，因為是將可從風箱分隔壁分離的板狀構件與燃燒器的卸下取出部分之兩者，製作成一體構造，可將兩者一起進行拆卸和安裝，使得維修方便性更趨良好。尤其是將第二導引構件由第三氣體噴嘴的內壁側來進行支承，如此一來，在進行卸下取出時的可動部分變得比較小，可謀求板狀構件的小型化、輕量化，也可提昇維修方便性。 　　[0038] 此外，根據本案的申請專利範圍第4項所述的發明，除了具有申請專利範圍第1項或第2項所述的發明的效果之外，又可利用設在第一氣體噴嘴的前端外周的火焰穩定器來擴大還原領域，並且可有效地在火焰穩定器的下游側形成燃燒用氣體的還原領域，因此著火性更趨良好。從而，可更為謀求降低NO_x 濃度。[Technical Problem to be Solved by the Invention] According to the invention disclosed in the aforementioned patent documents and the like, the shape of the fuel nozzle is made flat to shorten it: from the ignition area of a jet surface containing a fuel fluid to the center of the jet As a result, the unfired area can be reduced. Thus, the effect of reducing _the NO _x concentration is high. [0018] Especially on the outer periphery of the outlet in the tertiary combustion gas nozzle located at the outermost side of the fuel nozzle, a guide member (for example, as shown in FIG. 9) is provided to expand the combustion gas radially outward. the guide member 34), to form the reduced art, can be used to reduce further the effect of improving the NO _x concentration. The burner described in Patent Document 4 discloses a structure in which a combustion air (air) can be guided to the outer peripheral side by providing a tertiary air guide plate on the outer peripheral portion of the secondary air nozzle. [0019] The guide member such as the aforementioned three air guide plate is supported and fixed on the outer wall of the secondary combustion gas nozzle located on the inside thereof, that is, on the fuel nozzle side (combustor center axis side). When performing burner maintenance, the fuel nozzle must be removed from the stove. At this time, the burner part including the guide member must be removed from the burner center shaft and taken out of the stove. The larger the part that must be removed and removed, the greater the work load during maintenance. [0020] In addition, considering factors such as manufacturing tolerances of the burner structure and deformation due to radiant heat of the flame, generally, the outer diameter of the guide member is made smaller than the diameter of the wall surface of the furnace opening. Slightly smaller. If the outer diameter of the guide member is made slightly smaller than the diameter of the wall surface of the furnace opening, the gap between the guide member and the wall surface becomes larger, so the ratio of the direct flow in the axial direction of the burner will be larger. The increase will destroy the circulation. Thus, the circulating flow will be reduced, so that the reduction will reduce the art, and will result in an increase of _the NO _x concentration danger consideration. [0021] The object of the present invention is to provide: an seeks to prevent an increase of _the NO _x concentration solid fuel burner, having: a will contain an outer periphery of the fluid fuel jet flow ejected combustion gas toward the radially outer It has a square diffuser structure and is easy to maintain. [Technical Solution to Solve the Problem] [0022] In order to achieve the technical problem of the present invention described above, it can be achieved by the following configuration. The invention described in the first patent application scope of the present application is a solid fuel burner, which is a solid fuel provided with a first gas nozzle (2), a second gas nozzle (4), and a third gas nozzle (7). The burner, the first gas nozzle (2), has a cylindrical flow path through which a mixed fluid of solid fuel and a carrier gas of the solid fuel flows, and the shape of the opening facing the wall surface of the furnace is flat; The two-gas nozzle (4) is composed of a first combustion gas that communicates with a bellows (3) that allows the combustion gas for the solid fuel to flow and is formed on the outer peripheral side of the first gas nozzle (2). The flow path (5) has a flat opening shape, and a first guide member (13) is provided on the outer periphery of the front end to guide the combustion gas from the center axis side of the burner to the outer periphery side; the third gas The nozzle (7) is configured as a second combustion gas flow path that communicates with the bellows (3) through which the combustion gas for the solid fuel can flow and is formed on the outer peripheral side of the second gas nozzle (4). (6) In addition, the shape of the opening is cylindrical. At the same time, the cross section passing through the central axis of the burner is composed of a horizontal portion (7a) along the central axis of the burner and an inclined portion that increases in diameter from the horizontal portion (7a) toward the furnace. (7b), wherein a second guide for guiding the combustion gas from the center axis side of the burner to the outer peripheral side is provided on the exit side of the second combustion gas flow path (6) And a support member (15) for supporting and fixing the second guide member (14) on an inner wall of the third gas nozzle (7). [0023] The invention described in the second patent application scope of the present application is directed to the solid fuel burner described in the first patent application scope, wherein the second guide members (14) are respectively provided in the second The upper and lower sides of the gas nozzle (4). The invention described in item 3 of the scope of patent application of the present case is directed to the solid fuel burner described in item 1 or 2 of the scope of patent application, wherein a part of the partition wall (18) of the aforementioned wind box (3) Is a plate-like member (17) provided to be separable from the partition wall (18), and the first gas nozzle (2) and the second gas nozzle (4) are manufactured to be separated from the plate-like member (17) ) Form a unitary structure. [0024] The invention described in item 4 of the scope of patent application for this case is directed to the solid fuel burner described in item 1 or 2 of the scope of patent application, wherein the front end of the first gas nozzle (2) is The outer periphery is provided with a flame stabilizer (12) formed around the first gas nozzle (2), and a projection surface of the flame stabilizer (12) from the furnace side to the nozzle side is connected to the second gas nozzle (4) ) At least part of the projection surface overlaps. [0025] Here, the "flat shape" means, for example, a rectangle shown in FIG. 5 (A), an ellipse shown in FIG. 5 (B), and a semicircle shown in FIG. 5 (C). A combination shape with a rectangle and a shape such as a wide polygon shown in FIG. 5 (D) are defined as having a flat shape having a long diameter and a short diameter, or a long side W and a short side H. In FIG. 5 (A), it may be acceptable that some or all of the four corners are curved. Similarly, in FIG. 5 (D), a part or all of the corners of the polygon may be curved. In addition, in each of the shapes described above, the curvature of the curved portion is not limited. [0026] (Action) At the exit side in the third gas nozzle located at the outermost side of the first gas nozzle, a guide member for the combustion gas, that is, the second guide member is used by the first guide member on its inner peripheral side. When the two gas nozzles are supported by the wall surface, the second guide member is fixed to the outer wall of the second gas nozzle. Therefore, it is not necessary to include the second guide from the central axis of the burner when performing burner maintenance. The structure including the components is removed and taken out of the furnace. [0027] Since the second guide member is supported by the inner wall of the third gas nozzle on the outer peripheral side, the portion to be taken out must be removed and reduced to the size of the second guide member from the center axis of the burner. Only the second gas nozzle on the inner side. [0028] Therefore, according to the invention described in the first aspect of the patent application scope of the present application, since the second guide member is supported from the outer peripheral side, it is not necessary to remove the second guide member when performing maintenance on the burner. Take out, so you only need to remove the removed part is small, maintenance and repair become easy. If the second guide member is supported from the inner peripheral side, factors such as the aforementioned deformation must be taken into consideration, and the outer diameter of the second guide member must be made slightly smaller, and the second guide member and the second guide member must be enlarged. Clearance of the wall surface of the stove opening. However, since the guide member is supported by its outer peripheral side, the gap between the second guide member and the wall surface can be made smaller, or the diameter of the second guide member can be made larger than the opening of the wall surface. Larger diameter. [0029] In addition, by providing a cylindrical third gas nozzle on the outer periphery of the flat first gas nozzle, the second combustion gas flow path mainly interposes the long diameter or the long side of the first gas nozzle. Because it is arranged above and below, compared with the case where the third gas nozzle is formed into a flat shape similarly to the first gas nozzle and the second gas nozzle, the mixing of combustion gas and fuel can be reduced, and the center of the burner can be enlarged Ministry of Reduction. [0030] In addition, the combustion gas flowing through a wider upper and lower flow path between the third gas nozzle and the second gas nozzle has higher straightness than the left and right sides. Therefore, according to the invention described in the second patent application scope of the present application, in addition to the role of the invention described in the first patent application scope, the second guide member is provided on the upper side of the second gas nozzle, respectively. As a result, it is possible to guide the combustion gas having a high directivity to the outside. [0031] In addition, a part of the partition wall of the bellows is manufactured as a plate-like member that can be separated from the partition wall body. Therefore, the burner can be easily removed and installed during maintenance. According to the invention described in item 3 of the scope of patent application in this case, in addition to the role of the invention described in item 1 or 2 of the scope of patent application, the plate-like member of the bellows partition wall and the burner Take out the removed part and make it into an integrated structure, so you don't need to disassemble the two separately, you can disassemble at the same time. [0032] In addition, the invention described in item 4 of the scope of patent application of the present application has the function of the invention described in item 1 or 2 of the scope of patent application, because it uses the first gas nozzle provided. The flame stabilizer on the outer periphery of the front end forms a circulating flow on its downstream side, and therefore has the effect of expanding the reduction range. [0033] In addition, when the nozzle side is viewed from the stove side, if the flame stabilizer and the exit partition wall of the second gas nozzle at least partially overlap, it is possible to prevent: the direction of the burner axis in the second gas nozzle The flow of the combustion gas on the surface goes straight toward the furnace, and therefore, it has the ability to efficiently form a stagnation area (reduction area) of the combustion gas on the downstream side of the flame stabilizer, and it is possible to reliably perform ignition. effect. [Effect of the invention] [0034] The solid fuel burner of the present invention, based low NO _x combustion can be achieved, can enhance the ease of repair. Specifically, the following effects can be achieved. According to the invention described in item 1 of the scope of patent application of the present application, the second guide member is supported by the inner wall side of the third gas nozzle on the outer peripheral side, and the second guide member and the third gas can be supported. The gap on the inner wall of the nozzle is made smaller to reduce the direct flow of the combustion gas passing through this gap in the direction of the burner axis. Therefore, to ensure that the burner outlet is formed in the recycle stream downstream of the size, and can form a sufficient reduction of the art, it is possible to achieve low NO _x combustion. In addition, when performing maintenance on the burner, it is only necessary to remove and take out the member on the inner peripheral side of the second guide member. Therefore, the part to be removed and taken out becomes very small, and the maintenance convenience is also better. . [0035] Furthermore, by providing a cylindrical third gas nozzle on the outer periphery of the flat first gas nozzle, the mixing amount of the combustion gas and the fuel can be reduced, and the reduction area of the central portion of the burner can be expanded. more facilitate low NO _x combustion. [0036] In addition, according to the invention described in the second patent application scope of the present application, in addition to the effects of the invention described in the first patent application scope, the invention also has a straight forward flow through the second combustion gas flow path. higher combustion gas, flows toward the outer guide, and therefore, can achieve lower NO _x in combustion. [0037] In addition, according to the invention described in item 3 of the scope of patent application, in addition to the effects of the invention described in item 1 or 2, the scope of application is because the invention can be separated from the bellows partition wall. Both the plate-shaped member and the removal and removal part of the burner are made into an integrated structure, and the two can be removed and installed together, making the maintenance convenience easier. In particular, the second guide member is supported by the inner wall side of the third gas nozzle. In this way, the movable portion during the removal and removal can be relatively small, and the size and weight of the plate-shaped member can be reduced. , Can also improve the convenience of maintenance. [0038] In addition, according to the invention described in item 4 of the scope of patent application, in addition to the effects of the invention described in item 1 or 2 of the scope of patent application, the invention provided in the first gas nozzle can also be used. The flame stabilizer at the outer periphery of the front end expands the reduction area, and the reduction area of the combustion gas can be effectively formed on the downstream side of the flame stabilizer, so the ignitability is better. Thus, can be reduced more _the NO _x concentration.

[0040] 以下將顯示本發明的實施方式。 [實施例1] 　　[0041] 第1圖係顯示本發明的一種實施例之固體燃料燃燒器的局部剖面之概略側面圖；第2圖係顯示第1圖的固體燃料燃燒器的局部剖面之概略平面圖；第3圖（A）是將第1圖的固體燃料燃燒器從火爐側觀看之正面圖；第3圖（B）是將第1圖的固體燃料燃燒器之從Y-Y剖面線之箭頭方向觀察的剖面圖。 　　[0042] 燃料噴嘴（第一氣體噴嘴）2，是一個筒狀構件，其基部側係連接在含燃料的流體之配管19，其內部是構成：固體燃料與載送用的氣體（在本實施例中，係使用空氣）之固體氣體雙相流（混合流體）之流路。並且固體燃料是與載送用的氣體一起噴出。固體燃料，可以是：煤炭（粉煤）、生質之類的固體、粉體、或這些物質的混合物。在本實施例中，固體燃料是以粉煤，載送氣體是以空氣為例，並且將流經燃料噴嘴2內的載送氣體也稱為一次空氣，將燃料噴嘴2也稱為一次空氣噴嘴2。 　　[0043] 在燃料噴嘴2的外周，設有用來形成二次空氣流路5之二次空氣噴嘴（第二氣體噴嘴）4，在二次空氣噴嘴4的外周，設有用來形成三次空氣流路6之三次空氣噴嘴（第三氣體噴嘴）7。這些二次空氣及三次空氣是燃燒用氣體，與上述載送氣體同樣地，通常是使用空氣，但是，亦可使用：燃燒排氣、富含氧氣體、或者這些氣體的至少其中一種與空氣的混合氣體等。此外，所稱的二次空氣及三次空氣的二次及三次，只是為了與前述一次空氣進行區別而採用的稱呼而已，並無實質上的差異。 　　[0044] 從燃燒器出口側（火爐10側）的正面來觀看燃料噴嘴2、二次空氣噴嘴4以及三次空氣噴嘴7的話，係以燃料噴嘴2為中心，在其外側呈同心圓狀地配置有環狀的二次空氣噴嘴4，在二次空氣噴嘴4的外側呈同心圓狀地配置有環狀的三次空氣噴嘴7。三次空氣噴嘴7是構成最外周的空氣噴嘴。 　　[0045] 在燃料噴嘴2的內部，設置有貫穿燃料噴嘴2的點火燃燒器（油槍）1，其作為當燃燒器啟動時或低負荷燃燒時的助燃之用。在燃料噴嘴2的出口前端，設置有用來擴大一次空氣與二次空氣之間的循環流之火焰穩定器12。這個火焰穩定器12，係在燃料噴嘴2的前端部設置成圓環狀，而可在該火焰穩定器12的下游側形成循環流，而具有可提高著火性與穩定火焰之效果。此外，在燃料噴嘴2側，亦可使用形成有鯊魚齒狀突起的火焰穩定器12。此外，未設置火焰穩定器12的燃燒器也被包含在本實施方式中。 　　[0046] 前述點火燃燒器1、燃料噴嘴2、二次空氣噴嘴4以及三次空氣噴嘴7，係從設在火爐10的火爐壁（由未圖示的水管所形成的）9上的火爐開口部8，朝火爐10內部分別噴出各自的噴出物。又，這些點火燃燒器1、燃料噴嘴2、二次空氣噴嘴4以及三次空氣噴嘴7，係配置在：圍繞著火爐開口部8並且從燃燒用空氣流路（未圖示）來供給粉煤或燃燒用空氣的風箱3內。分隔壁18是用來分隔風箱3的內部空間與爐外20之壁狀構件，而在分隔壁18之中，設置有燃料噴嘴2之前板片17的構造，係製作成：可從分隔壁18分離地裝設在分隔壁18上的構造，當進行燃燒器的保養維修時，係可與燃料噴嘴2呈一體地卸下取出來。 　　[0047] 第4圖係顯示前板片17與分隔壁18之連接構造之一例的側面圖。 　　在與前板片17構成一體的板材42與分隔壁18上，係分別穿設有孔洞，將螺栓44***埋設於孔洞內，利用螺帽46鎖緊固定，即可將前板片17安裝在分隔壁18上。此外，不侷限於圖示的例子，亦可採用例如：以螺絲固定、掛鉤之類的其他的固定機構或卡止機構。 　　[0048] 此外，在燃料噴嘴2內的粉煤流路上，係具有：用以一邊將粉煤粒子濃縮到燃料噴嘴2的內壁側，一邊往火爐10內噴出之燃料的濃縮器11。濃縮器11係設在點火燃燒器1的外周，其與粉煤流路的軸方向正交的截面係形成有朝向燃料噴嘴2的內壁縮小的領域與擴大的領域，藉此，而具有可將燃料朝往噴嘴內壁側（中心軸的徑向外側）進行濃縮的作用。此外，未設置濃縮器11的燃燒器也包含在本實施方式中。 　　[0049] 二次空氣噴嘴4是由：固定在燃料噴嘴2的外壁上之平板狀的支承構件16所支承固定。此外，支承構件16的形狀並未特別限定，而且也不限定為從燃料噴嘴2的外壁來進行支承的情況，只要是處於能夠與燃料噴嘴2形成一體性的構造之結合關係的話即可。 　　[0050] 並且在二次空氣噴嘴4的出口前端，設置有：可相對於燃燒器中心軸C而朝徑向擴管（向外方擴開的形狀）之導引套筒（第一導引構件）13，二次空氣噴嘴4與導引套筒13是形成一體構造。利用導引套筒13來引導空氣流離開燃燒器中心軸C而朝外方噴出。又，在三次空氣流路6之中，並且是在二次空氣噴嘴4的上側與下側之流路寬度較大的領域中，分別設置有用以引導三次空氣之導引葉片（第二導引構件）14。此外，導引套筒13與導引葉片14的關係，係處於：導引套筒13之從火爐10朝向分隔壁18側的投影面與導引葉片14的投影面不會發生重疊之兩者的大小關係或兩者的配置關係。 　　[0051] 如第3圖所示，燃料噴嘴2以及二次空氣噴嘴4，在火爐開口部8是具有扁平形狀的開口形狀。藉由將燃料噴嘴形狀製作成扁平，以縮短從含燃料流體的噴流表面的著火領域起迄該噴流的中心部為止的距離，係可縮小未著火領域，因此，可謀求降低NO_x 濃度。此外，所稱的扁平形狀係指：如第5圖（A）所示的長方形、如第5圖（B）所示的橢圓、如第5圖（C）所示的半圓與長方形組合的形狀、如第5圖（D）所示的寬幅的多角形之類的形狀，係具有長徑與短徑，或者具有長邊W與短邊H之扁平的形狀。 　　[0052] 燃料噴嘴2之垂直於燃燒器中心軸C的截面形狀，從含燃料的流體配管19起迄前板片17附近（流路的狹窄部分）為止是圓形，由該處起迄火爐開口部8為止的區段，則是從燃燒器中心軸C起朝向外側在水平方向上單調地擴大，慢慢地增加扁平度，因此，在火爐開口部8處，乃是扁平度變得最大的形狀。 　　[0053] 前述扁平度係定義成：長邊W與短邊H之比（W/H）。因此，所謂的慢慢地增加扁平度，係指：燃料噴嘴2之與中心軸正交的截面的長邊W與短邊H的比（W/H）是一點一點逐漸增加之意，最大扁平形狀，係指：在燃料噴嘴2內之長邊W與短邊H之比（W/H）最大的部分的形狀。 　　在這個燃燒器所執行的燃燒過程中，是利用二次空氣噴嘴4的出口前端的導引套筒13和三次空氣噴嘴7內的導引葉片14，使得二次空氣流以及三次空氣流從燃燒器中心軸C側離開，因而可形成：讓含燃料流體的噴流與燃燒用氣體不會在燃燒器的極近處進行混合的這種流動。以這種方式，使得燃料滯留在高溫且氧氣不足的火焰內，而將NO_x 還原成氮氣。 　　[0054] 此外，利用燃料噴嘴2的出口前端的火焰穩定器12，來促進形成：循環流，也就是可使其下游側的領域的壓力下降，因而形成從下游流回到上游的循環流。因為在這個循環流內，係有高溫氣體滯留其中，因此可使得燃料粒子的著火不斷進展，而可提高火焰的穩定性。 　　[0055] 三次空氣噴嘴7也算是火爐壁9的一部分，三次空氣噴嘴7之通過燃燒器中心軸C的截面，係由：沿著燃燒器中心軸方向的水平部（直徑均一的部位）7a與火爐10側的傾斜部（直徑擴大的部位）7b所形成的，從火爐10側來觀看的話，是呈圓筒狀。又，三次空氣流路6是位於二次空氣噴嘴4的外壁與三次空氣噴嘴7之間的流路，左右的流路寬度較窄，上下的流路寬度較大。因此，可減少三次空氣與燃料的混合，因而能夠促進低NO_x 燃燒。 　　[0056] 第6圖（A）係顯示第1圖中的固體燃料燃燒器之局部擴大圖；第6圖（B）係顯示利用支承構件15來支承導引葉片14的支承構造之一例。此外，第7圖係顯示導引葉片14的例子之立體圖。 　　[0057] 導引葉片14是利用固定在三次空氣噴嘴7的內壁上的支承構件15而被支承固定。在圖示的例子中，支承構件15是由：固定在三次空氣噴嘴7的內壁上的上側支承構件15a、與固定在導引葉片14的外表面上的下側支承構件15b所組成的，藉由將上側支承構件15a與下側支承構件15b利用螺栓50與螺帽52來進行接合，即可將導引葉片14加以固定。 　　[0058] 如第7圖（A）所示，導引葉片14是由：平板狀的導入部14a與半月板狀的擴大部14b所形成的，其中的導入部14a是由：具有與三次空氣流的流動方向平行的面之平板狀構件所構成的；而其中的半月板狀的擴大部14b則是可將三次空氣流從燃燒器中心軸C引導朝往徑向外側（上側或下側）擴散之朝火爐10側延伸的半月板狀的擴大部14b。 　　[0059] 此外，有關於：導引葉片14的形狀、二次空氣噴嘴4的外壁以及與三次空氣噴嘴7之間的位置關係、個數、利用支承構件15來執行的支承形態，並未限定為只有圖示的例子而已。例如：擴大部14b亦可採用如第7圖（B）和第7圖（C）所示的這種三角形或四角形，其形狀並未受到限定。此外，本實施方式也包含將導入部14a予以省略的實施方式。至於支承構件15，只要是能夠從外周側的三次空氣噴嘴7的內壁來對於導引葉片14進行支承固定的話即可。此外，亦可在二次空氣噴嘴4的整個外周上，設置導引葉片14。 　　[0060] 在將燃料噴嘴形狀做成扁平形狀之燃燒器構造中，關於：為了能夠實現低NO_x 燃燒而將噴嘴外周的燃燒用空氣的氣流朝往外方擴散所達成的作用，係有下列的特徵。 　　相對於外周側的圓筒狀之三次空氣噴嘴7的水平部7a，內周側的燃料噴嘴2是寬幅的形狀。亦即，燃料噴嘴2以及二次空氣噴嘴4之在火爐開口部8處的形狀，是呈現：左右間的寬度大於上下間的寬度，因此，其外周側之被三次空氣噴嘴7所圍繞的三次空氣流路6，左右的流路寬度勢必變窄。因此，在這個領域中，空氣流量較少，朝外方擴散的氣流很弱。另一方面，三次空氣噴嘴7之上下的流路寬度是大於左右的流路寬度，因此流量較多，但是通過作為火爐開口部8的導入部之水平部7a後的氣流則是因為直進性很高，所以不易朝外方擴散。 　　[0061] 因此，必須充分地提高：使得流經三次空氣流路6之上下的三次空氣朝外方擴散的作用，而將導引葉片14設在三次空氣流路6的上下之作法是很有效果的。此外，導引葉片14的擴大部14b是較大的部分為宜。 　　[0062] 在進行燃燒器的保養維修等作業，而將燃料噴嘴2從火爐10拆卸取出時，如果導引葉片14是從其內周側的二次空氣噴嘴4的外壁來進行支承的話，必須卸下取出的部分，就是從燃燒器中心軸C起迄導引葉片14為止之較大的範圍。又，在這種情況下，考慮到燃燒器構造體的製作公差、火焰的輻射熱所導致的變形等的各種因素，必須將導引葉片14的外徑製作成比較小一點，而且將導引葉片14與三次空氣噴嘴7的內壁之間製作成大一點。 　　[0063] 但是，導引葉片14並不是從二次空氣噴嘴4的外壁，而是從三次空氣噴嘴7的內壁利用支承構件15來進行支承固定。因此，需要卸下取出的部分，只要從燃燒器中心軸C起迄二次空氣噴嘴4為止的狹窄範圍就可以了，因此，對於保養維修時的作業也不會加重負擔。而且無需考慮到上述的變形等的因素，可將導引葉片14與三次空氣噴嘴7的間隙S（第3圖（A））製作成比較小。亦即，可將導引葉片14的擴大部14b製作成比較大。藉由將導引葉片14的擴大部14b製作成比較大，可強化將三次空氣流朝外方擴散的作用。 　　[0064] 此外，如果是以將擴大部14b之在徑向上最遠離燃燒器中心軸C的端部的位置位於比水平部7a更外側的方式來設置導引葉片14的話，藉由設置這種形狀的導引葉片14，亦可將間隙S朝縮小側進行設定。根據這種構造，可減少穿越過間隙S的三次空氣的直進流的效果會變更大。 　　[0065] 綜合上述理由，因為可確保形成在燃燒器出口下游的循環流的大小，來形成充分的還原領域，因此可實現低NO_x 燃燒。 　　又，導引葉片14的支承構件15的形狀、個數、設置位置，並未特別限定。例如：係可如第3圖所示般地，將平板狀的支承構件15在上下分別各設置兩個，或者在上下分別各設置一個。以複數個支承構件15來支承導引葉片14的話，雖然支承構造比較牢固，但是個數太多的話，將成為空氣流的阻力，因此，是以可使平面與空氣流保持平行的方式，在上下分別各有二個的程度來進行配置為宜。利用導引葉片14來對於三次空氣賦予朝往火爐10之上下方向的速度成分，使火焰偏向而擴大NO_x 的還原領域的話，即使在燃燒器的低負荷時，亦可達成低NO_x 燃燒。 　　[0066] 燃料噴嘴2是嵌合在前板片17，因為前板片17是可從分隔壁18進行安裝拆脫的板狀構件，所以只要將前板片17從分隔壁18拆卸下來，就可以將點火燃燒器1、燃料噴嘴2、二次空氣噴嘴4等的構造體（也包含濃縮器11和火焰穩定器12、導引套筒13在內）保持一體地同時卸下來。 　　[0067] 此外，前板片17與燃料噴嘴2的結合，係可利用：嵌合方式、隔介著凸緣而利用螺栓及螺帽來進行結合的方式、直接以焊接進行接合的方式等，並不限定其結合的方式。 　　將原本固定著前板片17的螺帽46（第4圖）拆下來，再將前板片17朝爐外20側取出的話，就可將與它結合成一體的構件取出來。 　　[0068] 第8圖係顯示從爐外20觀看時的固體燃料燃燒器的燃料噴嘴2與前板片17之關係。第8圖（A）係顯示導引葉片14被支承在其外周側的三次空氣噴嘴7的內壁上的情況；第8圖（B）係顯示導引葉片14被支承在其內周側的二次空氣噴嘴4的外壁上的情況。 　　[0069] 在進行燃燒器的保養維修時，必須將燃料噴嘴2從火爐10取出，這個時候，如果導引葉片14是被支承在其內周側的二次空氣噴嘴4的外壁上的話，被卸下取出的部分，是從燃燒器中心軸C起算直到導引葉片14為止的較大範圍，因而，前板片17也必須製作成比較大一些（如第8圖（B）所示）。而且，對於保養維修時的作業也會加重負擔。但是，如果導引葉片14是被支承在其外周側的三次空氣噴嘴7的內壁的話，被卸下取出的部分，只要是從燃燒器中心軸C起迄二次空氣噴嘴4為止的較小範圍即可，因此，前板片17可以製作成較小（如第8圖（A）所示）。因此，不僅有助於前板片17的輕量化，也可提高維修方便性。 　　[0070] 形成一體而被卸下取出的最大直徑的構件，在本實施例中，係如第6圖所示般地，為了能夠從分隔壁18保持一體地取出包含二次空氣噴嘴4出口的導引套筒13在內的部分（比用來表示導引葉片14的下端部的虛線L更下方（內側）的部分），前板片17的大小，必須製作成：大於等於導引套筒13之從火爐10朝向分隔壁18側的投影面積的大小。 　　[0071] 在爐外20則是配置有許多未圖示的配管類和配線類，為了進行燃燒器的保養維修，而將燃料噴嘴2等構件與前板片17保持一體地卸下取出時，必須確保與這些構件之間的餘隙空間。餘隙空間的確保，尤其是在單機的容量擴大後的大口徑燃燒器的身上更為顯著。 　　[0072] 假設從燃燒器中心軸C起迄導引葉片14為止的構件，係被支承在其內周側（燃料噴嘴2側）而能夠呈一體地被卸下取出的構造的話，前板片17必須製作成更大，與未圖示的配管類、配線類發生干擾碰撞的可能性變高。此外，如果為了避免前述的干擾碰撞，而將配管類、配線類予以繞開配置的話，其走線將會變得很複雜，或者必須先將配管類、配線類予以拆開，等到被卸下取出的部分通過之後，才實施再度連接的作業等，將會造成作業性的不良。 　　[0073] 但是，如果不必將導引葉片14卸下取出，只需卸下取出其內周側的二次空氣噴嘴4及導引套筒13的話，則可將前板片17相應地製作成比較小。因此，幾乎不會發生上述的前板片17與配管類、配線類干擾碰撞的情事。 　　[0074] 在進行燃燒器的保養維修時，需要卸下取出的部分只要很小即可，維修方便性也更為良好。 　　第8圖（A）係顯示將前板片17製作成橢圓形的情況，但也可以製作成：直徑均一的圓形、四角形之類的多角形等、或者其他的形狀，只要是能夠配合噴嘴、最大直徑的構件的形狀的話即可。 　　[0075] 此外，雖然沒有加以圖示，但是，亦可在三次空氣噴嘴7的入口側設置：空氣迴旋葉片，係可產生迴旋流來對於三次空氣賦予迴旋流速；或者，在二次空氣噴嘴4的入口側設置：用以調整二次空氣量的氣流調節器。 　　[0076] 此外，在實施例中，雖然是顯示了三次空氣噴嘴7也算是火爐壁9的一部分的例子，這種例子之燃燒器結構可製作成比較單純，但是，三次空氣噴嘴7亦可製作成：與火爐壁9分開之另一個圓筒狀的構件。 　　[0077] 此外，如果處在：火焰穩定器12之從火爐10側朝向燃料噴嘴2側的投影面，係與導引套筒13的投影面至少有一部分重疊在一起的關係的話，就可以防止：二次空氣噴嘴4內之燃燒器軸方向上的二次空氣的氣流朝向火爐10直進而直接穿越過去，因而可在火焰穩定器12的下游側形成還原領域而確實地著火。 [產業上的可利用性] 　　[0078] 本發明係具有可當作使用固體燃料之燃燒器裝置的可利用性。[0040] Embodiments of the present invention will be shown below. [Embodiment 1] [0041] FIG. 1 is a schematic side view showing a partial cross section of a solid fuel burner according to an embodiment of the present invention; FIG. 2 is a schematic view showing a partial cross section of the solid fuel burner of FIG. 1 Plan view; Figure 3 (A) is a front view of the solid fuel burner of Figure 1 viewed from the stove side; Figure 3 (B) is the arrow direction of the solid fuel burner of Figure 1 from the YY section line Observed section. [0042] The fuel nozzle (first gas nozzle) 2 is a cylindrical member whose base side is connected to a pipe 19 containing a fuel-containing fluid, and the inside thereof is constituted by a solid fuel and a carrier gas (in this embodiment) In the example, it is a flow path of a solid gas two-phase flow (mixed fluid) using air). In addition, the solid fuel is ejected together with the carrier gas. The solid fuel can be: coal (pulverized coal), solid such as biomass, powder, or a mixture of these substances. In this embodiment, the solid fuel is pulverized coal, and the carrier gas is air. The carrier gas flowing through the fuel nozzle 2 is also referred to as primary air, and the fuel nozzle 2 is also referred to as primary air nozzle. 2. [0043] A secondary air nozzle (second gas nozzle) 4 for forming a secondary air flow path 5 is provided on the outer periphery of the fuel nozzle 2, and a tertiary air flow path is provided for the outer air of the secondary air nozzle 4. 6 tertiary air nozzle (third gas nozzle) 7. These secondary air and tertiary air are combustion gases. As with the carrier gas described above, air is usually used. However, it is also possible to use exhaust gas, oxygen-rich gas, or at least one of these gases with air. Mixed gas and so on. In addition, the so-called secondary air and tertiary air of the secondary air and tertiary air are only used to distinguish them from the aforementioned primary air, and there is no substantial difference. [0044] When the fuel nozzle 2, the secondary air nozzle 4, and the tertiary air nozzle 7 are viewed from the front side of the burner outlet side (the stove 10 side), the fuel nozzle 2 is centered on the fuel nozzle 2 and is arranged concentrically on the outer side thereof. An annular secondary air nozzle 4 is provided, and an annular tertiary air nozzle 7 is arranged concentrically outside the secondary air nozzle 4. The tertiary air nozzle 7 is an air nozzle constituting the outermost periphery. [0045] Inside the fuel nozzle 2, an ignition burner (oil gun) 1 penetrating through the fuel nozzle 2 is provided, which is used to assist combustion when the burner is activated or during low-load combustion. A flame stabilizer 12 is provided at the front end of the outlet of the fuel nozzle 2 to increase the circulating flow between the primary air and the secondary air. This flame stabilizer 12 is arranged in a ring shape at the front end portion of the fuel nozzle 2, and a circulating flow can be formed on the downstream side of the flame stabilizer 12, which has the effect of improving ignitability and stabilizing the flame. In addition, a flame stabilizer 12 having a shark tooth-like protrusion may be used on the fuel nozzle 2 side. A burner without the flame stabilizer 12 is also included in the present embodiment. [0046] The ignition burner 1, the fuel nozzle 2, the secondary air nozzle 4, and the tertiary air nozzle 7 are formed from a stove opening provided on a stove wall (formed by a water pipe (not shown)) 9 of the stove 10. 8. The respective sprays are sprayed toward the inside of the furnace 10 respectively. These ignition burners 1, fuel nozzles 2, secondary air nozzles 4, and tertiary air nozzles 7 are arranged around the furnace opening 8 and supply pulverized coal or air from a combustion air flow path (not shown). Inside the air box 3 for combustion air. The partition wall 18 is a wall-like member for separating the internal space of the bellows 3 and the furnace outer 20, and the structure of the plate 17 before the fuel nozzle 2 is provided in the partition wall 18 is made from: The structure 18 is separately installed on the partition wall 18, and can be removed and taken out integrally with the fuel nozzle 2 when the burner is maintained and repaired. 4 is a side view showing an example of a connection structure between a front plate piece 17 and a partition wall 18. The plate 42 and the partition wall 18 integrally formed with the front plate 17 are respectively provided with holes, and the bolts 44 are inserted and buried in the holes and locked and fixed with the nuts 46, so that the front plate 17 can be installed in On the partition wall 18. In addition, it is not limited to the example shown in the figure, and other fixing mechanisms or locking mechanisms such as fixing with screws or hooks may be used. [0048] In addition, the pulverized coal flow path in the fuel nozzle 2 includes a concentrator 11 for concentrating pulverized coal particles on the inner wall side of the fuel nozzle 2 and spraying fuel into the furnace 10. The concentrator 11 is provided on the outer periphery of the ignition burner 1, and a cross section orthogonal to the axial direction of the pulverized coal flow path forms a reduced area and an enlarged area toward the inner wall of the fuel nozzle 2. The fuel is concentrated toward the inner wall side of the nozzle (the radial outer side of the central axis). It should be noted that a burner without the concentrator 11 is also included in the present embodiment. [0049] The secondary air nozzle 4 is supported and fixed by a flat plate-shaped support member 16 fixed to the outer wall of the fuel nozzle 2. In addition, the shape of the support member 16 is not particularly limited, and it is not limited to a case where the support member 16 is supported from the outer wall of the fuel nozzle 2 as long as it has a coupling relationship capable of forming an integrated structure with the fuel nozzle 2. [0050] At the front end of the outlet of the secondary air nozzle 4, there is provided a guide sleeve (first guide) that can expand the tube in a radial direction (shape that expands outward) relative to the central axis C of the burner. Member) 13, the secondary air nozzle 4 and the guide sleeve 13 have an integrated structure. The guide sleeve 13 is used to guide the air flow away from the center axis C of the burner and eject it outward. Further, in the tertiary air flow path 6, guide blades (second guides) for guiding the tertiary air are provided in areas where the widths of the upper and lower sides of the secondary air nozzle 4 are large. Component) 14. In addition, the relationship between the guide sleeve 13 and the guide blade 14 lies in that the projection surface of the guide sleeve 13 from the furnace 10 toward the partition wall 18 and the projection surface of the guide blade 14 do not overlap. Size relationship or the configuration relationship between the two. [0051] As shown in FIG. 3, the fuel nozzle 2 and the secondary air nozzle 4 have opening shapes having a flat shape in the furnace opening portion 8. By making the fuel nozzle into a flat shape, in order to shorten the distance from the center portion of the field of fire jets pass onto the surface of the fuel-containing fluid from the jet, can be reduced based unfired art, therefore, _the NO _x concentration can be reduced. In addition, the so-called flat shape refers to a combination of a rectangle as shown in FIG. 5 (A), an ellipse as shown in FIG. 5 (B), and a combination of a semicircle and a rectangle as shown in FIG. 5 (C). The shape such as a wide polygon as shown in FIG. 5 (D) is a flat shape having a long diameter and a short diameter, or a long side W and a short side H. [0052] The cross-sectional shape of the fuel nozzle 2 perpendicular to the central axis C of the burner is circular from the fuel-containing fluid pipe 19 to the vicinity of the front plate 17 (narrow part of the flow path), and from there to the furnace The section up to the opening 8 is monotonously enlarged horizontally from the center axis C of the burner to the outside and gradually increases the flatness. Therefore, the flatness at the furnace opening 8 becomes the maximum. shape. [0053] The flatness is defined as the ratio (W / H) of the long side W to the short side H. Therefore, the so-called gradually increasing flatness means that the ratio (W / H) of the long side W to the short side H of the cross section of the fuel nozzle 2 orthogonal to the central axis is gradually increased little by little. The maximum flat shape refers to the shape of the portion having the largest ratio (W / H) of the long side W to the short side H in the fuel nozzle 2. In the combustion process performed by this burner, the guide sleeve 13 at the front end of the outlet of the secondary air nozzle 4 and the guide vanes 14 in the tertiary air nozzle 7 are used to make the secondary air flow and the tertiary air flow from the combustion. The central axis of the burner is separated from the C side, so that a flow in which the jet containing the fuel fluid and the combustion gas are not mixed in the immediate vicinity of the burner can be formed. In this manner, such that the fuel accumulated in the high temperature and lack of oxygen to the flame, while reducing NO _x to nitrogen. [0054] In addition, the flame stabilizer 12 at the front end of the outlet of the fuel nozzle 2 is used to promote the formation of a circulating flow, that is, to reduce the pressure in the area on the downstream side, thereby forming a circulating flow that flows from downstream to upstream. Because high-temperature gas is trapped in this circulating flow, the ignition of fuel particles can be continuously advanced, and the stability of the flame can be improved. [0055] The tertiary air nozzle 7 is also considered to be a part of the furnace wall 9. The cross section of the tertiary air nozzle 7 passing through the central axis C of the burner is composed of a horizontal portion (a uniform diameter portion) 7a along the central axis direction of the burner and The inclined portion (the enlarged diameter portion) 7b formed on the stove 10 side has a cylindrical shape when viewed from the stove 10 side. The tertiary air flow path 6 is a flow path between the outer wall of the secondary air nozzle 4 and the tertiary air nozzle 7. The width of the left and right flow paths is narrow, and the width of the upper and lower flow paths is large. Thus, the tertiary air may be reduced and fuel mixing, it is possible to promote the low NO _x combustion. [0056] FIG. 6 (A) is a partial enlarged view showing the solid fuel burner in FIG. 1; FIG. 6 (B) is an example of a support structure for supporting the guide blade 14 by the support member 15. FIG. 7 is a perspective view showing an example of the guide vane 14. [0057] The guide vane 14 is supported and fixed by a support member 15 fixed to the inner wall of the tertiary air nozzle 7. In the example shown, the support member 15 is composed of an upper support member 15 a fixed to the inner wall of the tertiary air nozzle 7 and a lower support member 15 b fixed to the outer surface of the guide vane 14. The guide blade 14 can be fixed by joining the upper support member 15a and the lower support member 15b with the bolt 50 and the nut 52. [0058] As shown in FIG. 7 (A), the guide vane 14 is formed by: a flat plate-shaped introduction portion 14a and a meniscus-shaped enlarged portion 14b, wherein the introduction portion 14a is composed of: The flow is formed by a flat plate-shaped member with a parallel flow direction. The meniscus-shaped enlarged portion 14b can guide the tertiary air flow from the center axis C of the burner toward the radially outer side (upper or lower side). The diffused meniscus-shaped enlarged portion 14b extends toward the furnace 10 side. [0059] In addition, the shape of the guide vane 14, the outer wall of the secondary air nozzle 4, and the positional relationship with the tertiary air nozzle 7, the number, and the support form performed by the support member 15 are not limited. For the sake of illustration only. For example, the enlarged portion 14b may also adopt such a triangle or a quadrangle as shown in FIG. 7 (B) and FIG. 7 (C), and its shape is not limited. The present embodiment also includes an embodiment in which the introduction unit 14a is omitted. As for the support member 15, the guide vane 14 may be supported and fixed from the inner wall of the tertiary air nozzle 7 on the outer peripheral side. In addition, a guide vane 14 may be provided on the entire outer periphery of the secondary air nozzle 4. [0060] In the fuel nozzle shaped to a flat shape of the burner configuration from: role order to achieve low NO _x combustion of the outer nozzle periphery of the combustion air flow toward the outward side diffusion reached, the system has the following feature. The fuel nozzle 2 on the inner peripheral side has a wide shape with respect to the horizontal portion 7a of the cylindrical tertiary air nozzle 7 on the outer peripheral side. In other words, the shapes of the fuel nozzles 2 and the secondary air nozzles 4 at the furnace opening 8 are such that the width between the left and right sides is larger than the width between the upper and lower sides. For the air flow path 6, the width of the left and right flow paths must be narrowed. Therefore, in this area, there is less air flow, and the airflow spreading outward is weak. On the other hand, the width of the flow path above and below the tertiary air nozzle 7 is larger than the width of the left and right flow paths. Therefore, the flow rate is large. High, so it is not easy to spread outside. [0061] Therefore, it is necessary to sufficiently improve the effect of making the tertiary air flowing above and below the tertiary air flow path 6 diffuse outward, and the method of setting the guide vanes 14 above and below the tertiary air flow path 6 is very important. Effect. The enlarged portion 14b of the guide vane 14 is preferably a large portion. [0062] When the burner is maintained and repaired, and the fuel nozzle 2 is removed from the furnace 10, if the guide vane 14 is supported from the outer wall of the secondary air nozzle 4 on the inner peripheral side, it must be supported. The removed portion is a wide range from the burner center axis C to the guide vane 14. In this case, in consideration of various factors such as manufacturing tolerances of the burner structure and deformation due to radiant heat of the flame, it is necessary to make the outer diameter of the guide vane 14 smaller, and the guide vane 14 14 and the inner wall of the tertiary air nozzle 7 are made larger. [0063] However, the guide vane 14 is supported and fixed by the support member 15 not from the outer wall of the secondary air nozzle 4, but from the inner wall of the tertiary air nozzle 7. Therefore, it is necessary to remove the removed portion, as long as the narrow range from the central axis C of the burner to the secondary air nozzle 4 is sufficient. Therefore, the work during maintenance and repair will not increase the burden. Moreover, the gap S (FIG. 3 (A)) of the guide vane 14 and the tertiary air nozzle 7 can be made relatively small without considering the above-mentioned deformation and the like. That is, the enlarged portion 14b of the guide blade 14 can be made relatively large. By making the enlarged portion 14b of the guide vane 14 relatively large, the effect of diffusing the tertiary air flow to the outside can be enhanced. [0064] In addition, if the guide vane 14 is provided so that the end portion of the enlarged portion 14b that is farthest from the burner center axis C in the radial direction is located more outward than the horizontal portion 7a, the guide vane 14 is provided. The shape of the guide vane 14 may be set to the narrowing side. According to this structure, the effect of reducing the direct flow of air three times across the gap S is greatly changed. [0065] The above reasons, as to ensure that the size of the burner outlet is formed downstream of the recycle stream to form a sufficient reduction of the art, it is possible to achieve low NO _x combustion. The shape, number, and installation position of the support members 15 of the guide blade 14 are not particularly limited. For example, as shown in FIG. 3, two flat support members 15 may be provided one above the other, or one may be provided one above the other. If a plurality of supporting members 15 are used to support the guide vane 14, the supporting structure is relatively strong, but if the number is too large, it will become the resistance of the air flow. Therefore, the plane and the air flow can be kept parallel. It is advisable to arrange them at two levels, one above the other. For the use of the guide vanes 14 to impart a velocity component toward the tertiary air toward the vertical direction of the furnace 10, the flame is enlarged toward the art of NO _x reduction, then, even at low load of the burner, it can achieve low NO _x combustion. [0066] The fuel nozzle 2 is fitted to the front plate 17, because the front plate 17 is a plate-like member that can be attached to and detached from the partition wall 18, as long as the front plate 17 is removed from the partition wall 18, The structural bodies (including the concentrator 11, the flame stabilizer 12, and the guide sleeve 13) such as the ignition burner 1, the fuel nozzle 2, and the secondary air nozzle 4 can be removed simultaneously and integrally. [0067] In addition, the combination of the front plate 17 and the fuel nozzle 2 can be used: a fitting method, a method of using a bolt and a nut through a flange, and a method of directly bonding by welding. It does not limit the way it is combined. When the nut 46 (FIG. 4) that originally fixed the front plate 17 is removed, and then the front plate 17 is taken out toward the outer side of the furnace 20, the component integrated with it can be taken out. 8 shows the relationship between the fuel nozzle 2 and the front plate 17 of the solid fuel burner when viewed from the outside of the furnace 20. FIG. 8 (A) shows the case where the guide blade 14 is supported on the inner wall of the tertiary air nozzle 7 on the outer peripheral side thereof; FIG. 8 (B) shows the case where the guide blade 14 is supported on the inner peripheral side thereof The situation on the outer wall of the secondary air nozzle 4. [0069] During maintenance and repair of the burner, the fuel nozzle 2 must be taken out of the furnace 10. At this time, if the guide blade 14 is supported on the outer wall of the secondary air nozzle 4 on the inner peripheral side, the guide blade 14 is The removed part is a large range from the burner central axis C to the guide vane 14, so the front plate 17 must also be made larger (as shown in Figure 8 (B)). In addition, the burden on maintenance work is increased. However, if the guide vane 14 is the inner wall of the tertiary air nozzle 7 supported on its outer peripheral side, the portion to be removed and taken out is only smaller than the secondary air nozzle 4 from the burner central axis C to the secondary air nozzle 4 The range is sufficient, so the front plate 17 can be made smaller (as shown in FIG. 8 (A)). Therefore, not only the weight of the front plate 17 is reduced, but also the convenience of maintenance can be improved. [0070] In this embodiment, as shown in FIG. 6, the member with the largest diameter that is integrated and removed is taken out, so that the secondary air nozzle 4 outlet including the outlet of the secondary air nozzle 4 can be taken out integrally as shown in FIG. 6. The part including the guide sleeve 13 (the part below (inside) the dotted line L used to indicate the lower end of the guide blade 14), the size of the front plate 17 must be made to be greater than or equal to the guide sleeve The size of the projection area of 13 from the furnace 10 to the partition wall 18 side. [0071] A large number of piping and wiring, not shown, are arranged outside the furnace 20, and the components such as the fuel nozzle 2 and the front plate 17 are removed and taken out for maintenance and repair of the burner. Clearance must be ensured with these components. The clearance space is ensured, especially on the large-caliber burner after the capacity of the single machine is enlarged. [0072] Assuming that the member from the burner central axis C to the guide vane 14 is supported on its inner peripheral side (the fuel nozzle 2 side) and can be removed and taken out integrally, the front plate 17 must be made larger, and the possibility of interference and collision with piping and wiring not shown is high. In addition, if the piping and wiring are bypassed in order to avoid the above-mentioned interference and collision, the wiring will become very complicated, or the piping and wiring must be disassembled before they are removed. Re-connection work will be performed after the removed part has passed, which will cause poor workability. [0073] However, if it is not necessary to remove and remove the guide vane 14, only the secondary air nozzle 4 and the guide sleeve 13 on its inner peripheral side need to be removed and removed, the front plate 17 can be made accordingly. smaller. Therefore, the interference and collision of the front plate piece 17 with piping and wiring as described above hardly occur. [0074] During the maintenance and repair of the burner, the parts that need to be removed and removed can be as small as possible, and the maintenance convenience is also better. Figure 8 (A) shows the case where the front plate 17 is made into an oval shape, but it can also be made into a circle with a uniform diameter, a polygon such as a quadrangle, or other shapes, as long as it can fit the nozzle The shape of the largest diameter member is sufficient. [0075] In addition, although not shown, it may be provided on the inlet side of the tertiary air nozzle 7: an air swirling blade, which can generate a swirling flow to impart a swirling flow velocity to the tertiary air; or, a secondary air nozzle 4 The inlet side is provided with: an air flow regulator for adjusting the amount of secondary air. [0076] In addition, in the embodiment, although the example in which the tertiary air nozzle 7 is also regarded as a part of the furnace wall 9 is shown, the burner structure of this example can be made relatively simple, but the tertiary air nozzle 7 can also be made. Finish: Another cylindrical member separated from the furnace wall 9. [0077] In addition, if the projection surface of the flame stabilizer 12 from the furnace 10 side toward the fuel nozzle 2 side is at least partially overlapped with the projection surface of the guide sleeve 13, it can be prevented : The secondary air flow in the direction of the burner axis in the secondary air nozzle 4 is directed toward the furnace 10 and then directly passes therethrough. Therefore, a reduction area can be formed on the downstream side of the flame stabilizer 12 and the flame can be reliably caught. [Industrial Applicability] [0078] The present invention has the applicability that can be regarded as a burner device using solid fuel.

[0079][0079]

1、21‧‧‧點火燃燒器1, 21‧‧‧Ignition burner

2、22‧‧‧燃料噴嘴2, 22‧‧‧ fuel nozzle

3、23‧‧‧風箱3, 23‧‧‧ bellows

4、24‧‧‧二次空氣噴嘴4, 24‧‧‧ secondary air nozzle

5、25‧‧‧二次空氣流路5.25‧‧‧secondary air flow path

6、26‧‧‧三次空氣流路6, 26‧‧‧three air flow paths

7、27‧‧‧三次空氣噴嘴7, 27‧‧‧three air nozzles

7a‧‧‧水平部7a‧‧‧Horizontal

7b‧‧‧傾斜部7b‧‧‧inclined

8‧‧‧火爐開口部8‧‧‧ Stove opening

9‧‧‧火爐壁9‧‧‧ fire wall

10‧‧‧火爐（內部）10‧‧‧ Stove (inside)

11‧‧‧燃料濃縮器11‧‧‧ fuel concentrator

12、32‧‧‧火焰穩定器12, 32‧‧‧ Flame stabilizer

13‧‧‧導引套筒13‧‧‧Guide Sleeve

14‧‧‧導引葉片14‧‧‧Guide Blade

14a‧‧‧導入部14a‧‧‧Introduction Department

14b‧‧‧擴大部14b‧‧‧Expansion Department

15‧‧‧導引葉片支承構件15‧‧‧Guide blade support member

16‧‧‧導引套筒支承構件16‧‧‧Guide sleeve support member

17‧‧‧前板片17‧‧‧ front plate

18‧‧‧分隔壁18‧‧‧ dividing wall

19‧‧‧含燃料的流體配管19‧‧‧ Fuel-containing fluid piping

20‧‧‧爐外（側）20‧‧‧ Outside the furnace (side)

33、34‧‧‧導引構件33, 34‧‧‧Guide members

35、36‧‧‧支承板35, 36‧‧‧ support plate

40‧‧‧循環流40‧‧‧Circulation

42‧‧‧板材42‧‧‧ Plate

44、50‧‧‧螺栓44, 50‧‧‧ bolt

46、52‧‧‧螺帽46, 52‧‧‧ Nuts

[0039] 　　第1圖係顯示本發明的一種實施例之固體燃料燃燒器的局部剖面之概略側面圖。 　　第2圖係顯示第1圖的固體燃料燃燒器的局部剖面之概略平面圖。 　　第3圖（A）是第1圖的固體燃料燃燒器之正面圖；第3圖（B）是將第1圖的固體燃料燃燒器之從Y-Y剖面線之箭頭方向觀察的剖面圖。 　　第4圖係顯示前板片與分隔壁之連接構造之一例的局部剖面之側面圖。 　　第5圖（A）、（B）、（C）、（D）係顯示第1圖的燃料噴嘴的開口部之各種截面形狀的圖。 　　第6圖（A）係顯示第1圖的固體燃料燃燒器之局部擴大圖；第6圖（B）係顯示導引葉片的支承構造之一例的圖。 　　第7圖係顯示導引葉片的例子之立體圖。 　　第8圖係顯示從爐外觀看時之固體燃料燃燒器的燃料噴嘴與前板片之關係圖。 　　第9圖係顯示傳統的粉煤燃燒器之局部剖面的側面圖。[0039] Fig. 1 is a schematic side view showing a partial cross section of a solid fuel burner according to an embodiment of the present invention. FIG. 2 is a schematic plan view showing a partial cross section of the solid fuel burner of FIG. 1. FIG. 3 (A) is a front view of the solid fuel burner of FIG. 1; FIG. 3 (B) is a cross-sectional view of the solid fuel burner of FIG. 1 viewed from a direction of an arrow of a Y-Y section line. FIG. 4 is a side view showing a partial cross-section of an example of a connection structure between a front plate and a partition wall. (5) (A), (B), (C), and (D) of FIG. 5 are diagrams showing various cross-sectional shapes of the opening portion of the fuel nozzle of FIG. (6) FIG. 6 (A) is a partial enlarged view showing the solid fuel burner of FIG. 1; FIG. 6 (B) is a view showing an example of a supporting structure of a guide blade. FIG. 7 is a perspective view showing an example of the guide vane. Figure 8 shows the relationship between the fuel nozzle of the solid fuel burner and the front plate when viewed from outside the furnace. Figure 9 is a side view showing a partial cross section of a conventional pulverized coal burner.

Claims (4)

一種固體燃料燃燒器，其是具備：第一氣體噴嘴、第二氣體噴嘴以及第三氣體噴嘴的固體燃料燃燒器， 　　該第一氣體噴嘴，係具有可供固體燃料與該固體燃料的載送氣體之混合流體流動的筒狀流路，並且面向火爐壁面的開口形狀是呈扁平形狀； 　　該第二氣體噴嘴，係構成：與可供前述固體燃料的燃燒用氣體流動之風箱相連通，且形成在前述第一氣體噴嘴的外周側之第一燃燒用氣體流路，並且開口形狀呈扁平形狀，同時，在前端外周設置有用以將燃燒用氣體從燃燒器中心軸側導引到外周側的第一導引構件； 　　該第三氣體噴嘴，係構成：與可供前述固體燃料的燃燒用氣體流動之風箱相連通，且形成在前述第二氣體噴嘴的外周側之第二燃燒用氣體流路，並且開口形狀呈圓筒狀，同時，其通過燃燒器中心軸的截面係由：沿著燃燒器中心軸方向的水平部與從該水平部朝火爐方向擴大直徑的傾斜部所形成的，該固體燃料燃燒器的特徵為： 　　在前述第二燃燒用氣體流路的出口側，設置有：用以將燃燒用氣體從燃燒器中心軸側導引到外周側之第二導引構件， 　　並且將用來支承固定該第二導引構件的支承構件設置在第三氣體噴嘴的內壁。A solid fuel burner comprising a first gas nozzle, a second gas nozzle, and a third gas nozzle. The first gas nozzle includes a solid fuel and a carrier gas for the solid fuel. A cylindrical flow path through which the mixed fluid flows, and the shape of the opening facing the wall surface of the furnace is flat; The first combustion gas flow path on the outer peripheral side of the first gas nozzle has a flat opening shape, and at the same time, a first part for guiding the combustion gas from the center axis side of the burner to the outer peripheral side is provided on the outer periphery of the front end. A guide member; the third gas nozzle is constituted by a second combustion gas flow path which communicates with a bellows through which the combustion gas for the solid fuel can flow and is formed on the outer peripheral side of the second gas nozzle , And the shape of the opening is cylindrical, at the same time, its cross section through the central axis of the burner is: water along the direction of the central axis of the burner The solid fuel burner is formed by an inclined portion having an enlarged diameter from the horizontal portion toward the furnace. The solid fuel burner is characterized in that: On the exit side of the second combustion gas flow path, a solid fuel burner is provided for removing combustion gas The second guide member of the burner center axis is guided to the outer peripheral side, and a support member for supporting and fixing the second guide member is provided on the inner wall of the third gas nozzle. 如申請專利範圍第1項所述的固體燃料燃燒器，其中，前述第二導引構件是分別設置在第二氣體噴嘴的上側與下側。The solid fuel burner according to item 1 of the scope of patent application, wherein the second guide member is provided on an upper side and a lower side of the second gas nozzle, respectively. 如申請專利範圍第1項或第2項所述的固體燃料燃燒器，其中，前述風箱的分隔壁的一部分，是設置成可與該分隔壁進行分離之板狀構件， 　　前述第一氣體噴嘴與第二氣體噴嘴，是製作成：與前述板狀構件形成一體的構造。The solid fuel burner according to claim 1 or 2, wherein a part of the partition wall of the bellows is a plate-shaped member provided to be separated from the partition wall, and the first gas nozzle The second gas nozzle has a structure integrally formed with the plate-shaped member. 如申請專利範圍第1項或第2項所述的固體燃料燃燒器，其中，在前述第一氣體噴嘴的前端外周，設有：圍繞在第一氣體噴嘴而形成的火焰穩定器，該火焰穩定器之從火爐側朝噴嘴側的投影面，係與第二氣體噴嘴的投影面至少有一部分重疊。The solid fuel burner according to claim 1 or claim 2, wherein a flame stabilizer formed around the first gas nozzle is provided on an outer periphery of a front end of the first gas nozzle, and the flame is stabilized. The projection surface of the device from the furnace side to the nozzle side overlaps at least a part of the projection surface of the second gas nozzle.