TW202033264A - Nox removal equipment - Google Patents

Nox removal equipment Download PDF

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TW202033264A
TW202033264A TW109101924A TW109101924A TW202033264A TW 202033264 A TW202033264 A TW 202033264A TW 109101924 A TW109101924 A TW 109101924A TW 109101924 A TW109101924 A TW 109101924A TW 202033264 A TW202033264 A TW 202033264A
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denitration
exhaust gas
supply line
duct
heat exchange
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TW109101924A
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TWI820288B (en
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堤龍二
宮西英雄
小田学
戶高心平
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日商三菱日立電力系統股份有限公司
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/90—Injecting reactants
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00—Capture or disposal of greenhouse gases
    • Y02C20/10—Capture or disposal of greenhouse gases of nitrous oxide (N2O)

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Health & Medical Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
  • Chimneys And Flues (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Gas Separation By Absorption (AREA)

Abstract

A NOx removal equipment comprising an inlet duct having a flow channel for flowing an exhaust gas from a boiler in a horizontaldirection, a joint duct having a flow channel for changing a flow of the exhaust gas from the horizontal direction to a vertical direction, and a reactor duct having a flow channel for flowing the exhaust gas in the vertical direction, wherein a screen plat, a NOx reductant supply line structure, and a fixed bed comprising a denitration catalyst are inside of the reactor duct in this order along the course of the exhaust gas, and the NOx reductant supply line structure comprises a heat exchange line, a transportation line and a nozzle, wherein the heat exchange line is for warming a NOx reductant with heat held by the exhaust gas, the transportation line is for delivering the warmed NOx reductant in the heat exchange line to the nozzle, and the nozzle is for injecting the NOx reductant delivered through the transportation line into the reactor duct.

Description

脫硝裝置Denitrification device

本發明，係關於脫硝裝置。The present invention relates to a denitration device.

提案有各種去除燃燒排氣所包含的氮氧化物之裝置。 例如，專利文獻1揭示有一種脫硝裝置，係於內建有觸媒層之脫硝反應器的上游配置還原劑注入裝置，使藉由該還原劑注入裝置所注入的還原劑與排氣中的氮氧化物反應；其特徵為：於前述還原劑注入裝置與前述觸媒層之間配置有分隔氣體流動方向的整流格子，並於該整流格子的至少一個區域內設置前述排氣與前述還原劑之氣體混合促進體。Various devices have been proposed to remove nitrogen oxides contained in combustion exhaust gas. For example, Patent Document 1 discloses a denitration device in which a reducing agent injection device is arranged upstream of a denitration reactor with a built-in catalyst layer, so that the reducing agent injected by the reducing agent injection device and the exhaust gas The nitrogen oxide reaction; characterized in that: a rectification grid that separates the gas flow direction is arranged between the reducing agent injection device and the catalyst layer, and the exhaust gas and the reduction are arranged in at least one area of the rectification grid The gas mixing promoter of the agent.

專利文獻2揭示有一種排煙脫硝裝置，係將排氣以熱交換器升溫且以還原劑還原，並通過脫硝觸媒而去除前述排氣中的氮氧化物；其特徵為：於前述熱交換器的上游設置整流板，並且以使該熱交換器與前述脫硝觸媒對向的方式配置，還原劑係藉由插設於熱交換器與脫硝觸媒之間的還原劑注入管所注入。Patent Document 2 discloses a flue gas denitrification device, which heats up exhaust gas in a heat exchanger and reduces it with a reducing agent, and removes nitrogen oxides in the exhaust gas through a denitrification catalyst; its feature is: A rectifying plate is installed upstream of the heat exchanger, and the heat exchanger is arranged to face the aforementioned denitration catalyst. The reducing agent is injected by the reducing agent inserted between the heat exchanger and the denitration catalyst. The tube is injected.

專利文獻3揭示有一種氨氣注入裝置，係於排氣流路內，具備正交於排氣流配置的複數個母管、從該母管的側面突出設置的複數個突出管、於該各突出管的端部以往排氣流的下游方向開口的方式設置的噴嘴，各噴嘴的中心線與母管側面的距離係比母管的外徑更大，投影在正交於排氣流的剖面之各噴嘴的位置係以位於彼此相鄰的複數個正三角形的各頂點的方式配置，並於比噴嘴更靠排氣流的上游側具有排氣整流裝置。Patent Document 3 discloses an ammonia gas injection device, which is located in an exhaust gas flow path and is provided with a plurality of main pipes arranged orthogonal to the exhaust flow, a plurality of protruding pipes protruding from the side of the main pipe, and The end of the protruding pipe is conventionally installed with nozzles open in the downstream direction of the exhaust flow. The distance between the center line of each nozzle and the side surface of the main pipe is greater than the outer diameter of the main pipe, and is projected on a cross-section orthogonal to the exhaust flow. The positions of the nozzles are arranged to be located at the vertices of a plurality of equilateral triangles adjacent to each other, and an exhaust gas rectifying device is provided on the upstream side of the exhaust gas flow than the nozzles.

專利文獻4揭示有一種脫硝劑注入裝置，係於排氣流中注入脫硝劑而去除氮氧化物；其特徵為：於脫硝劑注入管的下游側的排氣流中配置脫硝劑供給管，並連接該脫硝劑注入管與脫硝劑供給管，藉此利用作為脫硝劑供給管和脫硝劑加熱用及注入脫硝混合促進用的構件。Patent Document 4 discloses a denitrification agent injection device that injects a denitrification agent into the exhaust gas stream to remove nitrogen oxides; it is characterized in that the denitrification agent is arranged in the exhaust gas stream downstream of the denitrification agent injection pipe The supply pipe is connected to the denitration agent injection pipe and the denitration agent supply pipe, thereby being used as a denitration agent supply pipe and a member for heating and injection denitration mixing promotion.

專利文獻5揭示有一種氨注入配管，係於廢氣中配置氨注入噴嘴部並噴霧氨，藉此將廢氣中之氮氧化物還原處理；其特徵為：將氨注入噴嘴部上游側的配管作為藉由廢氣所保有的熱將氨加熱的氨加熱部。 [先前技術文獻]Patent Document 5 discloses an ammonia injection pipe in which an ammonia injection nozzle is arranged in the exhaust gas and the ammonia is sprayed to reduce nitrogen oxides in the exhaust gas; it is characterized in that the pipe on the upstream side of the ammonia injection nozzle is used as a borrow An ammonia heating unit that heats the ammonia by the heat retained in the exhaust gas. [Prior Technical Literature]

[專利文獻1]日本特開平10-165769號公報 [專利文獻2]日本特開平10-57770號公報 [專利文獻3]日本特開平8-89754號公報 [專利文獻4]日本特開昭60-12120號公報 [專利文獻5]日本特開昭56-10322號公報[Patent Document 1] Japanese Patent Application Laid-Open No. 10-165769 [Patent Document 2] Japanese Patent Application Laid-Open No. 10-57770 [Patent Document 3] Japanese Patent Application Laid-Open No. 8-89754 [Patent Document 4] Japanese Patent Application Publication No. 60-12120 [Patent Document 5] Japanese Patent Application Laid-Open No. 56-10322

[發明所欲解決之問題][The problem to be solved by the invention]

本發明之課題，係在於提供一種新穎的脫硝裝置。 [解決問題之技術手段]The subject of the present invention is to provide a novel denitration device. [Technical means to solve the problem]

本發明，係包含以下形態。The present invention includes the following aspects.

[1]一種脫硝裝置，係具有： 反應器導管，係具有使來自鍋爐的排氣流動的流路； 於反應器導管內，沿著排氣的流動，依序具有篩板、脫硝劑供給線系統、包含脫硝觸媒的固定床，並且， 脫硝劑供給線系統，係具有：熱交換線，係用以將排氣保有的熱將脫硝劑加溫；輸送線，係用以將以熱交換線加溫的脫硝劑供給至噴嘴；以及噴嘴，係用以將經由輸送線所供給的脫硝劑注入至反應器導管。[1] A denitration device with: The reactor duct has a flow path for the exhaust gas from the boiler to flow; In the reactor tube, along the flow of exhaust gas, there are sieve plates, a denitration agent supply line system, and a fixed bed containing denitration catalyst in sequence, and, The denitration agent supply line system is equipped with: a heat exchange line to heat the denitrification agent with the heat retained by the exhaust gas; a conveying line to supply the denitrification agent heated by the heat exchange line to the nozzle ; And the nozzle is used to inject the denitration agent supplied via the conveying line into the reactor tube.

[2]一種脫硝裝置，係具有： 入口導管，係具有使來自鍋爐的排氣往橫方向流動的流路；接頭導管，係具有使排氣的流動從橫方向改變為縱方向的流路；以及反應器導管，係具有使排氣往縱方向流動的流路； 於反應器導管內，沿著排氣的流動，依序具有篩板、脫硝劑供給線系統、包含脫硝觸媒的固定床，並且， 脫硝劑供給線系統，係具有：熱交換線，係用以將排氣保有的熱將脫硝劑加溫；輸送線，係用以將以熱交換線加溫的脫硝劑供給至噴嘴；以及噴嘴，係用以將經由輸送線所供給的脫硝劑注入至反應器導管。[2] A denitration device with: The inlet duct has a flow path that allows the exhaust gas from the boiler to flow in the horizontal direction; the joint duct has a flow path that changes the flow of the exhaust gas from the horizontal direction to the vertical direction; and the reactor duct has a flow path for the exhaust gas Flow path flowing in the longitudinal direction; In the reactor tube, along the flow of exhaust gas, there are sieve plates, a denitration agent supply line system, and a fixed bed containing denitration catalyst in sequence, and, The denitration agent supply line system is equipped with: a heat exchange line to heat the denitrification agent with the heat retained by the exhaust gas; a conveying line to supply the denitrification agent heated by the heat exchange line to the nozzle ; And the nozzle is used to inject the denitration agent supplied via the conveying line into the reactor tube.

[3]如[1]或[2]所述之脫硝裝置，其中， 進一步具有支撐篩板的構造物， 脫硝劑供給線系統被支撐篩板的構造物所支撐。 [4]如[1]或[2]所述之脫硝裝置，其中， 進一步具有支撐篩板的構造物及支撐脫硝劑供給線系統的構造物， 脫硝劑供給線系統被支撐脫硝劑供給線系統的構造物所支撐。 [5]如[1]～[4]中任一項所述之脫硝裝置，其中， 脫硝劑供給線系統，係進一步具有擋板。 [6]如[1]～[5]中任一項所述之脫硝裝置，其中， 係於熱交換線的至少一部分具有散熱片。 [發明之效果][3] The denitration device as described in [1] or [2], wherein: It further has a structure supporting the sieve plate, The denitration agent supply line system is supported by the structure supporting the sieve plate. [4] The denitration device as described in [1] or [2], wherein: It further has a structure that supports the sieve plate and a structure that supports the denitration agent supply line system, The denitrifying agent supply line system is supported by the structure supporting the denitrifying agent supply line system. [5] The denitration device according to any one of [1] to [4], wherein: The denitration agent supply line system is further equipped with baffles. [6] The denitration device according to any one of [1] to [5], wherein: At least a part of the heat exchange line has a heat sink. [Effects of Invention]

本發明之脫硝裝置，係能夠將排氣與脫硝劑均勻地混合，且導入至固定床的排氣的流動不易產生不均，故脫硝效率極高。本發明之脫硝裝置，不易產生固定床之閉塞及固定床之不均勻磨耗，亦能夠抑制硫酸銨生成導致機器故障，而能夠長期穩定地使用。 本發明之脫硝裝置，係於篩板與觸媒固定床之間且較佳為氣體流並無不均的部位注入脫硝劑，故脫硝劑均勻地供給至觸媒固定床，且不與觸媒反應便穿過的脫硝劑的量較少。因此，不需注入遠超脫硝反應之脫硝劑的化學計量比之過剩量的脫硝劑，而能夠減少運轉成本。The denitration device of the present invention can uniformly mix the exhaust gas and the denitration agent, and the flow of the exhaust gas introduced into the fixed bed is not easily uneven, so the denitration efficiency is extremely high. The denitrification device of the present invention is not easy to produce occlusion of the fixed bed and uneven abrasion of the fixed bed, can also inhibit the generation of ammonium sulfate and cause machine failure, and can be used stably for a long time. The denitrification device of the present invention is between the sieve plate and the fixed catalyst bed, and it is preferable to inject the denitrification agent at a place where there is no uneven gas flow, so the denitrification agent is uniformly supplied to the catalyst fixed bed without The amount of denitration agent passing through the reaction with the catalyst is small. Therefore, it is not necessary to inject an excess amount of denitration agent far exceeding the stoichiometric ratio of the denitration agent in the denitration reaction, and the operating cost can be reduced.

以下，根據圖式對本發明之實施形態進行具體說明。又，本發明之範圍，不限於以下之實施形態。Hereinafter, the embodiments of the present invention will be described in detail based on the drawings. In addition, the scope of the present invention is not limited to the following embodiments.

圖1係表示本發明之脫硝裝置之第一實施形態的圖。第一實施形態之脫硝裝置，係具有：反應器導管6，係具有使來自鍋爐的排氣流動的流路。於反應器導管內，沿著排氣的流動，依序具有：篩板3，係包含複數個格柵而成；脫硝劑供給線系統7；以及固定床4，係包含用以脫硝去除排氣所包含的氮氧化物之觸媒。格柵，係一般以平板等構成。並且，脫硝劑供給線系統7，係具有：熱交換線8，係用以將排氣保有的熱將脫硝劑加溫；輸送線9，係用以將以熱交換線加溫的脫硝劑供給至噴嘴；以及噴嘴10，係將經由輸送線所供給的脫硝劑注入至反應器導管。Fig. 1 is a diagram showing the first embodiment of the denitration device of the present invention. The denitration device of the first embodiment has a reactor duct 6 having a flow path through which exhaust gas from a boiler flows. In the reactor duct, along the flow of the exhaust gas, there are in order: a sieve plate 3, which is composed of a plurality of grids; a denitrification agent supply line system 7; and a fixed bed 4, which is used for denitration and removal The catalyst of nitrogen oxide contained in exhaust gas. The grid is generally composed of flat plates. In addition, the denitrification agent supply line system 7 has: a heat exchange line 8 for heating the denitrification agent with the heat retained by the exhaust gas; and a conveying line 9 for heating the denitrification agent heated by the heat exchange line The nitrate agent is supplied to the nozzle; and the nozzle 10 is for injecting the denitration agent supplied via the conveying line into the reactor conduit.

圖2係表示本發明之脫硝裝置之第二實施形態的圖。第二實施形態之脫硝裝置，係具有入口導管1、接頭導管2、反應器導管6以及出口導管5。來自鍋爐的排氣G，係以入口導管1、接頭導管2、反應器導管6以及出口導管5的順序流動。Fig. 2 is a diagram showing a second embodiment of the denitration device of the present invention. The denitrification device of the second embodiment has an inlet duct 1, a joint duct 2, a reactor duct 6, and an outlet duct 5. The exhaust gas G from the boiler flows in the order of the inlet duct 1, the joint duct 2, the reactor duct 6, and the outlet duct 5.

於第二實施形態之脫硝裝置中，入口導管1，係具有使來自鍋爐的排氣往橫方向流動的流路。於圖2中，以直線描繪入口導管1的流路之分隔上側的面及分隔下側的面。從氣體流動方向觀察之入口導管的流路的剖面形狀，係能夠為矩形、梯形、圓形、橢圓形等。其中，以加工容易程度而言，係矩形為佳。In the denitrification device of the second embodiment, the inlet duct 1 has a flow path through which exhaust gas from the boiler flows in the horizontal direction. In FIG. 2, the surface on the upper side of the partition and the surface on the lower side of the partition of the flow path of the inlet duct 1 are drawn with straight lines. The cross-sectional shape of the flow path of the inlet duct viewed from the gas flow direction can be rectangular, trapezoidal, circular, oval, or the like. Among them, in terms of ease of processing, a rectangular shape is preferred.

於第二實施形態之脫硝裝置中，接頭導管2，係具有使排氣的流動從橫方向改變為縱方向的流路。圖2所示之接頭導管，雖係將流動改變為朝向下方者，然而如圖6所示般為將流動改變為朝向上方者亦可。接頭導管的方向，能夠考慮脫硝裝置的設置空間或佈局而適當選擇。於圖2中，以直線描繪接頭導管2的流路之分隔上側的面及分隔下側的面。接頭導管2的流路之分隔上側的面及分隔下側的面，在從與圖2相同的視點觀察的情形下，為弧形亦可。並且，分隔入口導管1的流路之下側的面與分隔反應導管6的流路之靠近入口導管1之側的面係直接被接合，而省略分隔接頭導管2的流路之下側的面亦可。從氣體流動方向觀察之接頭導管2的流路的剖面形狀，係能夠為矩形、梯形、圓形、橢圓形等。其中，以加工容易程度而言，係矩形為佳。In the denitration device of the second embodiment, the joint duct 2 has a flow path that changes the flow of exhaust gas from the horizontal direction to the vertical direction. Although the joint conduit shown in Fig. 2 changes the flow to the downward direction, it is also possible to change the flow to the upward direction as shown in Fig. 6. The direction of the joint duct can be appropriately selected in consideration of the installation space or layout of the denitration device. In FIG. 2, the surface on the upper side of the partition and the surface on the lower side of the partition of the flow path of the joint duct 2 are drawn with straight lines. The surface on the upper side of the partition and the surface on the lower side of the partition of the flow path of the joint duct 2 may have an arc shape when viewed from the same viewpoint as in FIG. 2. In addition, the surface on the lower side of the flow path separating the inlet duct 1 and the surface on the side closer to the inlet pipe 1 that separates the flow path of the reaction pipe 6 are directly joined, and the surface on the lower side of the flow path separating the joint duct 2 is omitted. It can be. The cross-sectional shape of the flow path of the joint duct 2 viewed from the gas flow direction can be rectangular, trapezoidal, circular, elliptical, or the like. Among them, in terms of ease of processing, a rectangular shape is preferred.

於第二實施形態之脫硝裝置中，反應器導管6，係具有使排氣往縱方向流動的流路。於圖2中，以直線描繪反應器導管6的流路之分隔靠近入口導管側的面及分隔遠離入口導管側的面。從氣體流動方向觀察之反應器導管的流路的剖面形狀，係能夠為矩形、梯形、圓形、橢圓形等。其中，以加工容易程度而言，係矩形為佳。反應器導管的流路剖面的大小，較佳為從反應器導管的入口經過觸媒固定床的出口至反應器導管的出口為幾乎相同。反應器導管的出口，係一般連接至出口導管5的入口。In the denitration device of the second embodiment, the reactor duct 6 has a flow path for flowing exhaust gas in the longitudinal direction. In FIG. 2, the flow path of the reactor duct 6 is drawn with a straight line on the side near the inlet duct and the side far from the inlet duct. The cross-sectional shape of the flow path of the reactor tube viewed from the gas flow direction can be rectangular, trapezoidal, circular, elliptical, or the like. Among them, in terms of ease of processing, a rectangular shape is preferred. The size of the flow path cross section of the reactor tube is preferably almost the same from the inlet of the reactor tube through the outlet of the fixed catalyst bed to the outlet of the reactor tube. The outlet of the reactor tube is generally connected to the inlet of the outlet tube 5.

於反應器導管內，設有篩板3、脫硝劑供給線系統7以及觸媒固定床4。篩板3，係設於反應器導管的入口側。於反應器導管的入口側設置支撐篩板的構造物，例如設置橫跨反應器導管內的樑等(未圖示)。藉由篩板支承構造物將篩板支撐於反應器導管內。觸媒固定床4，係設於反應器導管的出口側。於反應器導管的出口側設置支撐觸媒固定床的構造物，例如設置橫跨反應器導管內的樑等(未圖示)。藉由觸媒固定床支承構造物將觸媒固定床支撐於反應器導管內。脫硝劑供給線系統7，係設於篩板與觸媒固定床之間。脫硝劑供給線系統，係設於比觸媒固定床更靠近篩板側為佳。脫硝劑供給線系統，藉由前述之篩板支承構造物或觸媒固定床支承構造物支撐亦可，於篩板與觸媒固定床之間設置支撐脫硝劑供給線系統的構造物，例如設置橫跨反應器導管內的樑等，藉由脫硝劑供給線系統支承構造物將脫硝劑供給線系統支撐於反應器導管內亦可。 支撐的方式並未特別限定，例如置於設置在下的支承構造物之上亦可，從設置於上的支承構造物懸吊亦可，跨架於設置在側方的支承構造物亦可。In the reactor conduit, a sieve plate 3, a denitrification agent supply line system 7 and a catalyst fixed bed 4 are provided. The sieve plate 3 is arranged on the inlet side of the reactor tube. A structure supporting the sieve plate is installed on the inlet side of the reactor tube, for example, a beam etc. (not shown) that spans the inside of the reactor tube is installed. The sieve plate is supported in the reactor tube by the sieve plate support structure. The fixed catalyst bed 4 is arranged on the outlet side of the reactor tube. A structure supporting the fixed catalyst bed is installed on the outlet side of the reactor tube, for example, a beam etc. (not shown) that spans the inside of the reactor tube is installed. The catalyst fixed bed is supported in the reactor tube by the catalyst fixed bed support structure. The denitration agent supply line system 7 is arranged between the sieve plate and the fixed catalyst bed. The denitrification agent supply line system is preferably located closer to the side of the sieve plate than the fixed catalyst bed. The denitration agent supply line system may be supported by the aforementioned sieve plate support structure or catalyst fixed bed support structure, and a structure supporting the denitrifier supply line system is installed between the sieve plate and the catalyst fixed bed. For example, a beam or the like may be installed across the inside of the reactor duct, and the denitration agent supply line system may be supported in the reactor duct by the denitration agent supply line system support structure. The method of support is not particularly limited. For example, it may be placed on a supporting structure installed below, suspended from a supporting structure installed above, or straddling a supporting structure installed on the side.

篩板，係較佳為包含複數個格柵而成。複數個格柵，係一般以主面為平行的方式配置。為了將複數個格柵以如此配置進行固定，而將正交於各格柵的主面的方向之線材或板材(橫置構件)接合於各格柵，以形成格子亦可。並且，於複數個格柵的兩端設置外框材(終端構件)亦可。 篩板，係於反應器導管6的流路之入口側，涵蓋流路的整個剖面，以格柵的主面實質上正交於入口導管1之氣體流動方向且實質上平行於反應器導管6之氣體流動方向的方式，來設置篩板為佳。 就篩板的設置而言，係於反應器導管6的流路的入口，於對向之2個流路的內壁將樑以例如對於入口導管1之氣體流動方向為平行、直角或格子狀跨越，並在該樑之上或樑與樑之間設置篩板單元亦可。藉由該複數個篩板單元構成篩板。篩板單元，係將格柵與橫置構件或終端構件以梯子狀或格子狀接合者，為呈柵狀者亦可。The sieve plate is preferably composed of a plurality of grids. Plural grids are generally arranged in such a way that the main surfaces are parallel. In order to fix a plurality of grids in such an arrangement, wires or plates (transverse members) in a direction orthogonal to the main surface of each grid may be joined to each grid to form a grid. In addition, outer frame materials (terminal members) may be provided at both ends of a plurality of grids. The sieve plate is attached to the inlet side of the flow path of the reactor pipe 6 and covers the entire cross section of the flow path. The main surface of the grid is substantially orthogonal to the gas flow direction of the inlet pipe 1 and substantially parallel to the reactor pipe 6 It is better to set the sieve plate in the way of the gas flow direction. As far as the setting of the sieve plate is concerned, it is tied to the inlet of the flow path of the reactor duct 6, and the inner walls of the two opposing flow paths are arranged such that, for example, the gas flow direction of the inlet duct 1 is parallel, right-angled or lattice-shaped. Spanning, and a sieve plate unit can be arranged above the beam or between the beam and the beam. A sieve plate is formed by the plurality of sieve plate units. The sieve unit is one that joins the grid and the horizontal member or the terminal member in a ladder shape or a lattice shape, and it may be a grid shape.

脫硝劑供給線系統，係具有：熱交換線8，係用以將排氣保有的熱將脫硝劑加溫；輸送線9，係用以將以熱交換線加溫的脫硝劑供給至噴嘴；以及噴嘴10，係將經由輸送線所供給的脫硝劑注入至反應器導管。The denitrification agent supply line system has: heat exchange line 8, which is used to heat the denitrification agent with the heat retained by the exhaust gas; conveying line 9 is used to supply the denitrification agent heated by the heat exchange line To the nozzle; and the nozzle 10, the denitration agent supplied via the conveying line is injected into the reactor conduit.

熱交換線8，係將傳熱管對於反應器導管之氣體流為正交的方式配置的管路。熱交換線，係將傳熱管以羊腸狀、串狀或梳子狀往橫向配置一段亦可。熱交換線8，係將傳熱管以平行列或交錯狀往縱向多層配置亦可。作為傳熱管，使用直線或曲線形之熱傳導性高的管。傳熱管的剖面形狀，係圓形、多角形等亦可。傳熱管的內壁係平滑亦可，為了提升熱傳導性而刻有溝亦可。使用內壁有螺旋溝的傳熱管為佳。傳熱管，係於外壁具有散熱片13亦可。作為散熱片，能夠列舉平板散熱片、波狀散熱片、狹縫散熱片、螺旋散熱片、通氣式散熱片等。散熱片，係以其主面對於格柵的主面為平行或直角且實質上平行於反應器導管6之氣體流動方向的方式來配置為佳。熱交換線的入口端係係連接至來自反應器導管之外的脫硝劑槽的管，熱交換線的出口端係連接至輸送線的入口端。作為脫硝劑，係使用將氨之氣體以空氣稀釋者為佳。於反應器導管內，將氨氣於熱交換線加溫至不致生成硫酸銨的溫度為佳。The heat exchange line 8 is a pipeline arranged in such a way that the heat transfer tube is orthogonal to the gas flow of the reactor tube. For the heat exchange line, a section of the heat transfer tube can be arranged horizontally in a lamb, string or comb shape. The heat exchange line 8 can also be arranged in parallel rows or staggered longitudinally in multiple layers. As the heat transfer tube, a straight or curved tube with high thermal conductivity is used. The cross-sectional shape of the heat transfer tube may be round or polygonal. The inner wall of the heat transfer tube may be smooth, or grooves may be carved in order to improve thermal conductivity. It is better to use heat transfer tubes with spiral grooves on the inner wall. The heat transfer tube may also have fins 13 on the outer wall. Examples of heat sinks include flat heat sinks, corrugated heat sinks, slit heat sinks, spiral heat sinks, and vented heat sinks. The heat sink is preferably arranged in such a way that its main surface is parallel or at right angles to the main surface of the grid and substantially parallel to the gas flow direction of the reactor tube 6. The inlet end of the heat exchange line is connected to the pipe from the denitrifier tank outside the reactor tube, and the outlet end of the heat exchange line is connected to the inlet end of the conveying line. As the denitrification agent, it is better to use the ammonia gas diluted with air. In the reactor tube, it is better to heat the ammonia gas on the heat exchange line to a temperature that does not generate ammonium sulfate.

輸送線9，係將供給管對於反應器導管之氣體流為正交的方式配置的管路。作為供給管，使用直線或曲線形的管。供給管的剖面形狀，係圓形、多角形等亦可。供給管的內壁，從減少壓力損耗的觀點而言，係平滑為佳。輸送線，係將供給管以羊腸狀、串狀或梳子狀往橫向配置一段為佳。輸送線，係能夠於反應器導管內，設置在與熱交換線相同的高度位準、比熱交換線更低的高度位準，或是比熱交換線更高的高度位準皆可，然而設置在比熱交換線更高的高度位準為佳。輸送線，係以使供給管的長度方向對於格柵的主面為平行或直角的方式來配置為佳。The conveying line 9 is a pipe arranged in such a way that the supply pipe is orthogonal to the gas flow of the reactor pipe. As the supply pipe, a straight or curved pipe is used. The cross-sectional shape of the supply pipe may be circular, polygonal, or the like. From the viewpoint of reducing pressure loss, the inner wall of the supply pipe is preferably smooth. For the conveying line, it is better to arrange a section of the supply tube horizontally in the shape of a sheep intestine, string or comb. The conveying line can be set in the reactor tube at the same height level as the heat exchange line, lower than the heat exchange line, or higher than the heat exchange line. However, it can be set at A higher height level than the heat exchange line is better. The conveying line is preferably arranged so that the longitudinal direction of the supply pipe is parallel or at right angles to the main surface of the grid.

噴嘴10，只要能夠將脫硝劑供給至反應器導管內，則其形狀等並未特別限定。噴嘴，係能夠於供給管的中途或末端至少設置1個。噴嘴，係以使脫硝劑往與反應器導管之氣體流的方向相同的方向進行供給的方式設置為佳。並且，若以使輸送線或熱交換線配置於噴嘴的下游的方式設置噴嘴，則會因輸送線或熱交換線攪亂流動，使所供給的脫硝劑與排氣均勻混和，故較佳。所設置的噴嘴的數量，只要能夠將脫硝劑均勻供給至反應器導管內，則並未特別限定。噴嘴係能夠以交錯、並排等排列方式設置。交錯的配置、角度等能夠適當設定。The shape of the nozzle 10 and the like are not particularly limited as long as it can supply the denitration agent into the reactor duct. At least one nozzle can be installed in the middle or end of the supply pipe. The nozzle is preferably installed in such a way that the denitration agent is supplied in the same direction as the direction of the gas flow in the reactor tube. In addition, if the nozzle is installed such that the conveying line or the heat exchange line is arranged downstream of the nozzle, the conveying line or the heat exchange line will disturb the flow and uniformly mix the supplied denitrification agent and exhaust gas, which is preferable. The number of nozzles provided is not particularly limited as long as the denitration agent can be uniformly supplied into the reactor duct. The nozzle system can be arranged in a staggered, side-by-side arrangement. The staggered arrangement, angle, etc. can be appropriately set.

圖3，係從斜下方觀察圖2所示之脫硝劑供給線系統7時的概念圖。圖3所示之熱交換線，散熱片13係設於傳熱管8的外側的一部分，傳熱管8係以羊腸狀進行配管。在熱交換線之熱傳係數充分大的情形下，不將散熱片如圖7般設置亦可。圖3所示之輸送線，係將供給管9配置為串狀，並於供給管9的中途及末端設置有複數個噴嘴10。Fig. 3 is a conceptual diagram of the denitrifier supply line system 7 shown in Fig. 2 when viewed obliquely from below. In the heat exchange line shown in FIG. 3, the radiating fin 13 is provided on a part of the outer side of the heat transfer tube 8, and the heat transfer tube 8 is piped in the shape of a sheep intestine. In the case that the heat transfer coefficient of the heat exchange line is sufficiently large, the heat sink may not be arranged as shown in Figure 7. In the conveying line shown in FIG. 3, the supply pipe 9 is arranged in a string shape, and a plurality of nozzles 10 are provided in the middle and the end of the supply pipe 9.

能夠於脫硝劑供給線系統進一步具有擋板。擋板，係不特別受其形狀限制，例如為沿著設置有噴嘴的供給管的稜線以人字形擴展者(人字形擋板11，參照圖4)，為於設置有噴嘴的供給管的兩側以翼形擴展者(翼形擋板12，參照圖5)亦可。It is possible to further have a baffle in the denitration agent supply line system. The baffle is not particularly limited by its shape. For example, it is a herringbone extending along the ridge line of the supply pipe with nozzles (herringbone baffle 11, refer to FIG. 4), which is on both sides of the supply pipe with nozzles. A wing-shaped extension on the side (wing-shaped baffle 12, refer to FIG. 5) is also acceptable.

本發明之脫硝裝置，係能夠使氮氧化物與脫硝劑一起均勻地接觸於觸媒固定床，故能夠提高於觸媒固定床之反應率。並且，因燃燒排氣所包含的塵埃會均勻地接觸於觸媒固定床，故能夠防止觸媒固定床之局部性的磨耗或是塵埃局部性堆積於觸媒固定床，而能夠抑制觸媒之局部性劣化。本發明之脫硝裝置，係能夠抑制燃燒排氣可能包含之硫含量與作為脫硝劑之一的氨之反應，而能夠減少硫酸銨之生成。The denitrification device of the present invention can make the nitrogen oxide and the denitrification agent uniformly contact the fixed catalyst bed, so the reaction rate in the fixed catalyst bed can be improved. In addition, since the dust contained in the combustion exhaust will uniformly contact the fixed catalyst bed, it is possible to prevent local abrasion of the fixed catalyst bed or local accumulation of dust on the fixed catalyst bed, thereby suppressing the catalyst Localized deterioration. The denitrification device of the present invention can suppress the reaction between the sulfur content that may be contained in the combustion exhaust gas and ammonia, which is one of the denitrification agents, and can reduce the production of ammonium sulfate.

1:入口導管 2:接頭導管 3:篩板 4:觸媒固定床 5:出口導管 6:反應器導管 7:脫硝劑(NH3)供給線系統 8:熱交換線 9:輸送線 10:噴嘴 11:人字形擋板 12:翼形擋板 13:散熱片 G:排氣1: inlet duct 2: joint duct 3: sieve plate 4: catalyst fixed bed 5: outlet duct 6: reactor duct 7: denitrifier (NH 3 ) supply line system 8: heat exchange line 9: conveying line 10: Nozzle 11: Herringbone baffle 12: Wing baffle 13: Heat sink G: Exhaust

[圖1]係表示本發明之脫硝裝置之第一實施形態的圖。 [圖2]係表示本發明之脫硝裝置之第二實施形態的圖。 [圖3]係表示脫硝劑供給線系統(附散熱片)之一例的立體圖。 [圖4]係表示脫硝劑供給線系統(附人字形擋板)之一例的剖面圖。 [圖5]係表示脫硝劑供給線系統(附翼形擋板)之一例的剖面圖。 [圖6]係表示本發明之脫硝裝置之第三實施形態的圖。 [圖7]係表示脫硝劑供給線系統(無散熱片)之一例的立體圖。Fig. 1 is a diagram showing the first embodiment of the denitration device of the present invention. Fig. 2 is a diagram showing the second embodiment of the denitration device of the present invention. [Fig. 3] is a perspective view showing an example of a denitration agent supply line system (with heat sink). [Fig. 4] is a cross-sectional view showing an example of a denitration agent supply line system (with a chevron baffle). [Fig. 5] is a cross-sectional view showing an example of a denitration agent supply line system (with a wing-shaped baffle). Fig. 6 is a diagram showing a third embodiment of the denitration device of the present invention. [Fig. 7] A perspective view showing an example of a denitration agent supply line system (without fins).

3:篩板 3: Sieve plate

4:觸媒固定床 4: Catalyst fixed bed

6:反應器導管 6: Reactor catheter

7:脫硝劑(NH3)供給線系統 7: Denitrifier (NH 3 ) supply line system

G:排氣 G: Exhaust

Claims (6)

一種脫硝裝置，係具有： 反應器導管，係具有使來自鍋爐的排氣流動的流路； 於反應器導管內，沿著排氣的流動，依序具有篩板、脫硝劑供給線系統、包含脫硝觸媒的固定床，並且， 脫硝劑供給線系統，係具有：熱交換線，係用以將排氣保有的熱將脫硝劑加溫；輸送線，係用以將以熱交換線加溫的脫硝劑供給至噴嘴；以及噴嘴，係用以將經由輸送線所供給的脫硝劑注入至反應器導管。A denitration device, which has: The reactor duct has a flow path for the exhaust gas from the boiler to flow; In the reactor tube, along the flow of exhaust gas, there are sieve plates, a denitration agent supply line system, and a fixed bed containing denitration catalyst in sequence, and, The denitration agent supply line system is equipped with: a heat exchange line to heat the denitrification agent with the heat retained by the exhaust gas; a conveying line to supply the denitrification agent heated by the heat exchange line to the nozzle ; And the nozzle is used to inject the denitration agent supplied via the conveying line into the reactor tube. 一種脫硝裝置，係具有： 入口導管，係具有使來自鍋爐的排氣往橫方向流動的流路；接頭導管，係具有使排氣的流動從橫方向改變為縱方向的流路；以及反應器導管，係具有使排氣往縱方向流動的流路； 於反應器導管內，沿著排氣的流動，依序具有篩板、脫硝劑供給線系統、包含脫硝觸媒的固定床，並且， 脫硝劑供給線系統，係具有：熱交換線，係用以將排氣保有的熱將脫硝劑加溫；輸送線，係用以將以熱交換線加溫的脫硝劑供給至噴嘴；以及噴嘴，係用以將經由輸送線所供給的脫硝劑注入至反應器導管。A denitration device, which has: The inlet duct has a flow path that allows the exhaust gas from the boiler to flow in the horizontal direction; the joint duct has a flow path that changes the flow of the exhaust gas from the horizontal direction to the vertical direction; and the reactor duct has a flow path for the exhaust gas Flow path flowing in the longitudinal direction; In the reactor tube, along the flow of exhaust gas, there are sieve plates, a denitration agent supply line system, and a fixed bed containing denitration catalyst in sequence, and, The denitration agent supply line system is equipped with: a heat exchange line to heat the denitrification agent with the heat retained by the exhaust gas; a conveying line to supply the denitrification agent heated by the heat exchange line to the nozzle ; And the nozzle is used to inject the denitration agent supplied via the conveying line into the reactor tube. 如請求項1或2所述之脫硝裝置，其中， 進一步具有支撐篩板的構造物， 脫硝劑供給線系統被支撐篩板的構造物所支撐。The denitration device according to claim 1 or 2, wherein: It further has a structure supporting the sieve plate, The denitration agent supply line system is supported by the structure supporting the sieve plate. 如請求項1或2所述之脫硝裝置，其中， 進一步具有支撐篩板的構造物及支撐脫硝劑供給線系統的構造物， 脫硝劑供給線系統被支撐脫硝劑供給線系統的構造物所支撐。The denitration device according to claim 1 or 2, wherein: It further has a structure that supports the sieve plate and a structure that supports the denitration agent supply line system, The denitrifying agent supply line system is supported by the structure supporting the denitrifying agent supply line system. 如請求項1或2所述之脫硝裝置，其中， 脫硝劑供給線系統，係進一步具有擋板。The denitration device according to claim 1 or 2, wherein: The denitration agent supply line system is further equipped with baffles. 如請求項1或2所述之脫硝裝置，其中， 係於熱交換線的至少一部分具有散熱片。The denitration device according to claim 1 or 2, wherein: At least a part of the heat exchange line has a heat sink.
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