JP2012241937A

JP2012241937A - Tower boiler

Info

Publication number: JP2012241937A
Application number: JP2011110297A
Authority: JP
Inventors: Iwau Ri; 賀李
Original assignee: IHI Corp
Current assignee: IHI Corp
Priority date: 2011-05-17
Filing date: 2011-05-17
Publication date: 2012-12-10

Abstract

PROBLEM TO BE SOLVED: To provide a tower boiler improving heat absorption efficiency in an economizer composing a rear heat transfer section.SOLUTION: This tower boiler 1 includes a furnace 2, and the rear heat transfer section arranged in a flow path 10 positioned above the furnace 2. In the tower boiler, a flow path connected to the downstream side of the flow path 10 is formed as a narrow flow path 11, and the economizer 8 composing the rear heat transfer section is arranged in the narrow flow path 11.

Description

本発明は、火炉の上方に後部伝熱部が配置されるタワーボイラに関するものである。 The present invention relates to a tower boiler in which a rear heat transfer section is disposed above a furnace.

上記したタワーボイラとしては、例えば、特許文献１に開示されたものがある。
このタワーボイラは、火炉と、この火炉内に燃料を噴射して燃焼させるバーナと、このバーナから火炉内に燃料を噴射して燃焼させることで生じる燃焼ガスとの間で熱交換を行う後部伝熱部を備えており、この後部伝熱部は、主として一次過熱器，二次過熱器，最終過熱器，再熱器及び節炭器から成っている。 As the above-described tower boiler, for example, there is one disclosed in Patent Document 1.
This tower boiler is a rear transmission that performs heat exchange between a furnace, a burner that injects and burns fuel into the furnace, and a combustion gas that is generated by injecting and burning fuel from the burner into the furnace. The rear heat transfer section mainly comprises a primary superheater, a secondary superheater, a final superheater, a reheater, and a economizer.

このタワーボイラにおいて、火炉で生じた燃焼ガスが流れる流路は火炉の上方に連続しており、後部伝熱部はこの火炉の下流側に当たる火炉の上方の流路に配置される。そして、このタワーボイラでは、燃焼ガスを火炉上方の流路内の後部伝熱部へ流して熱交換させ、この熱交換後の排ガスをさらに下流側に配置した脱硝装置等の排煙処理装置へ流して窒素化合物等の灰成分を除去した後、大気に放出するようになっている。 In this tower boiler, the flow path through which the combustion gas generated in the furnace flows is continuous above the furnace, and the rear heat transfer section is disposed in the flow path above the furnace that is downstream of the furnace. In this tower boiler, the combustion gas is flowed to the rear heat transfer section in the flow path above the furnace to exchange heat, and the exhaust gas after the heat exchange is further moved to a flue gas treatment apparatus such as a denitration apparatus disposed downstream. After removing ash components such as nitrogen compounds by flowing, they are released into the atmosphere.

特開2002-039507号公報JP 2002-039507 A

上記した特許文献１に開示されたタワーボイラにおいて、後部伝熱部を構成する節炭器は、この後部伝熱部の最も下流側、すなわち、火炉からより離れた上方に配置されるが、この節炭器のガス通過断面積は、火炉や後部伝熱部の他の構成機器と同じである。
また、このタワーボイラにおいて、火炉から離れるにしたがって、すなわち、上方に進むにつれて、燃焼ガス温度が下がるので、ガス体積が小さくなって燃焼ガスの流速も低下する。
つまり、上記したタワーボイラでは、節炭器のガス通過断面積が火炉や後部伝熱部の他の構成機器と同じ程度に広く、そして、この節炭器を通過する燃焼ガスの流速が低いことから、節炭器における収熱効率が良くないという問題があり、この問題を解決することが従来の課題となっていた。 In the tower boiler disclosed in Patent Document 1 described above, the economizer constituting the rear heat transfer section is disposed on the most downstream side of the rear heat transfer section, that is, on the upper side further away from the furnace. The gas passage cross-sectional area of the charcoal is the same as other components of the furnace and the rear heat transfer section.
Further, in this tower boiler, the combustion gas temperature decreases as the distance from the furnace increases, that is, as it advances upward, so that the gas volume decreases and the flow rate of the combustion gas also decreases.
That is, in the tower boiler described above, the gas passage cross-sectional area of the economizer is as wide as that of other components in the furnace and the rear heat transfer section, and the flow velocity of the combustion gas passing through the economizer is low. However, there is a problem that the heat collecting efficiency in the economizer is not good, and it has been a conventional problem to solve this problem.

本発明は、上記した従来の課題に着目してなされたもので、後部伝熱部を構成する節炭器における収熱効率を向上させることが可能であるタワーボイラを提供することを目的としている。 The present invention has been made by paying attention to the above-described conventional problems, and an object of the present invention is to provide a tower boiler capable of improving the heat collection efficiency in the economizer constituting the rear heat transfer section.

本発明の請求項１に係る発明は、火炉と、この火炉の上方に位置する上方流路に配置される後部伝熱部を備えたタワーボイラにおいて、前記上方流路の下流側に続く流路を前記上方流路よりも狭い狭隘流路として、この狭隘流路に前記後部伝熱部を構成する節炭器を配置した構成としたことを特徴としており、このタワーボイラの構成を前述した従来の課題を解決するための手段としている。 The invention according to claim 1 of the present invention is a tower boiler including a furnace and a rear heat transfer section disposed in an upper flow path located above the furnace, and a flow path that continues downstream of the upper flow path. The narrow boiler channel is narrower than the upper channel, and the economizer that constitutes the rear heat transfer section is disposed in the narrow channel, and the configuration of the tower boiler is the conventional one described above. As a means to solve the problem.

本発明に係るタワーボイラでは、後部伝熱部を構成する節炭器を狭隘流路に配置しているので、節炭器におけるガス通過断面積が、火炉や後部伝熱部の他の構成機器でのガス通過断面積よりも狭くなり、その結果、火炉から離れている狭隘流路において燃焼ガスの流速が低くなったとしても、効率良く収熱し得ることとなる。 In the tower boiler according to the present invention, since the economizer constituting the rear heat transfer section is arranged in the narrow channel, the gas passage cross-sectional area in the economizer is a furnace or other components of the rear heat transfer section. As a result, even if the flow velocity of the combustion gas is lowered in the narrow flow path away from the furnace, the heat can be collected efficiently.

本発明に係るタワーボイラでは、上記した構成としているので、後部伝熱部を構成する節炭器における収熱効率の向上を実現することができるという非常に優れた効果がもたらされる。 In the tower boiler according to the present invention, since it has the above-described configuration, a very excellent effect is achieved that it is possible to realize an improvement in heat collection efficiency in the economizer that constitutes the rear heat transfer section.

本発明に係るタワーボイラの一実施形態を示す側面方向からの概要構成説明図である。BRIEF DESCRIPTION OF THE DRAWINGS It is a general | schematic structure explanatory drawing from the side surface which shows one Embodiment of the tower boiler which concerns on this invention.

以下、本発明に係るタワーボイラを図面に基づいて説明する。
図１は、本発明に係るタワーボイラの一実施形態を示している。 Hereinafter, the tower boiler concerning the present invention is explained based on a drawing.
FIG. 1 shows an embodiment of a tower boiler according to the present invention.

図１に示すように、このタワーボイラ１は、火炉２と、この火炉２内に燃料を噴射して燃焼させるバーナ３と、このバーナ３から火炉２内に燃料を噴射して燃焼させることで生じる燃焼ガスＧとの間で熱交換を行う後部伝熱部を備えており、この後部伝熱部は、一次過熱器４，二次過熱器５，最終過熱器６，再熱器７及び節炭器８とから成っている。 As shown in FIG. 1, the tower boiler 1 includes a furnace 2, a burner 3 that injects and burns fuel into the furnace 2, and fuel that is injected from the burner 3 into the furnace 2 to burn. A rear heat transfer section that exchanges heat with the generated combustion gas G is provided. The rear heat transfer section includes a primary superheater 4, a secondary superheater 5, a final superheater 6, a reheater 7, and a node. It consists of charcoal 8 and so on.

このタワーボイラ１において、火炉２で生じた燃焼ガスＧが流れる流路は火炉２の上方に連続しており、後部伝熱部はこの火炉２の下流側に当たる上方流路１０に配置される。この場合、上方流路１０の下流側に続く流路を幅寸法Ｗａの上方流路１０よりも狭い幅寸法Ｗｂの狭隘流路１１として形成してあり、この狭隘流路１１に後部伝熱部を構成する節炭器８を配置している。 In this tower boiler 1, the flow path through which the combustion gas G generated in the furnace 2 flows is continuous above the furnace 2, and the rear heat transfer section is disposed in the upper flow path 10 that corresponds to the downstream side of the furnace 2. In this case, the downstream channel of the upper channel 10 is formed as a narrow channel 11 having a width dimension Wb narrower than the upper channel 10 having a width dimension Wa, and the rear heat transfer section is formed in the narrow channel 11. The economizer 8 which comprises is arrange | positioned.

このタワーボイラ１では、燃焼ガスＧを火炉２に連続する上方流路１０内の後部伝熱部、すなわち、二次過熱器５，最終過熱器６，再熱器７，一次過熱器４へ順次流して熱交換させるのに続いて、上方流路１０に連続する狭隘流路１１内の後部伝熱部を構成する節炭器８へ燃焼ガスＧを流して熱交換させ、この熱交換後の排ガスＥＧをさらに下流側に配置した脱硝装置の脱硝触媒９や図示しない脱硫装置等の排煙処理装置へ流して窒素化合物等の灰成分を除去した後、大気に放出するようになっている。 In this tower boiler 1, the combustion gas G is sequentially transferred to the rear heat transfer section in the upper flow path 10 that is continuous with the furnace 2, that is, the secondary superheater 5, the final superheater 6, the reheater 7, and the primary superheater 4. After flowing and exchanging heat, the combustion gas G is caused to flow through the economizer 8 constituting the rear heat transfer section in the narrow channel 11 that is continuous with the upper channel 10 to exchange heat. The exhaust gas EG is allowed to flow to a denitration catalyst 9 of a denitration device disposed downstream and a flue gas treatment device such as a desulfurization device (not shown) to remove ash components such as nitrogen compounds, and then released to the atmosphere.

上記したように、この実施形態に係るタワーボイラ１では、上方流路１０の下流側に連続する流路を幅寸法Ｗａの上方流路１０よりも狭い幅寸法Ｗｂの狭隘流路１１として形成したうえで、この狭隘流路１１に後部伝熱部を構成する機器のうちの最も下流側に配置される節炭器８を設置しているので、この節炭器８におけるガス通過断面積が、火炉２や後部伝熱部の他の構成機器でのガス通過断面積よりも狭くなり、したがって、火炉２から離れている狭隘流路１１において燃焼ガスＧの流速を最適化でき、効率良く収熱し得ることとなる。 As described above, in the tower boiler 1 according to this embodiment, the flow path continuous to the downstream side of the upper flow path 10 is formed as the narrow flow path 11 having a width dimension Wb narrower than the upper flow path 10 having the width dimension Wa. In addition, since the economizer 8 disposed on the most downstream side of the equipment constituting the rear heat transfer section is installed in the narrow channel 11, the gas passage cross-sectional area in the economizer 8 is the furnace. 2 and the gas passage cross-sectional area in other components of the rear heat transfer section is narrower. Therefore, the flow velocity of the combustion gas G can be optimized in the narrow flow passage 11 away from the furnace 2, and heat can be collected efficiently. It will be.

本発明に係るタワーボイラの構成は、上記した実施形態に係るタワーボイラの構成に限定されるものではない。 The configuration of the tower boiler according to the present invention is not limited to the configuration of the tower boiler according to the above-described embodiment.

１タワーボイラ
２火炉
４一次過熱器（後部伝熱部）
５二次過熱器（後部伝熱部）
６最終過熱器（後部伝熱部）
７再熱器（後部伝熱部）
８節炭器（後部伝熱部）
１０上方流路
１１狭隘流路 1 Tower boiler 2 Furnace 4 Primary superheater (rear heat transfer section)
5 Secondary superheater (rear heat transfer section)
6 Final superheater (rear heat transfer section)
7 Reheater (rear heat transfer section)
8 economizer (rear heat transfer section)
10 Upper channel 11 Narrow channel

Claims

A furnace,
In a tower boiler provided with a rear heat transfer section arranged in an upper flow path located above the furnace,
A tower boiler characterized in that a flow path continuing downstream from the upper flow path is a narrow flow path narrower than the upper flow path, and the economizer constituting the rear heat transfer section is disposed in the narrow flow path. .