448273 五、發明說明（1) 本發明有關於一種用於固體’尤其是垃圾，的熱處理方 法，其中的固體係在第一階段藉供給主空氣而焚化，而緊 接第一階段之後，煙道氣係在後燃室中’與次級空氣混合 並焚化，以致其等得以完全燃燒：而SNCR方法，其中注射 一種還原劑進入煙道氣者，係用來去除煙道氣中的氮氧化 物（deNOx)，俾以減低煙道氣令的氧化氮。 已知早先技藝，在燃燒室加進主空氣及在下游的後燃室 加入次級空氣’以焚化成塊的固體，像是垃圾之類。在這 種焚化的過程中’固體通常是在一焚化壚篦上運送，主空 氣是從爐篦的底下供給’流過爐篦的覆篕物，進入在爐氣 上面的固體的基床。 在焚化的過程中，形成在該基床中和基床上的煙道氣， 其溫度和組成成分’在位置和時間上’都有相當大的變動 。因此，該煙道氣要與次級空氣混合，或者與次級空氣和 再循環氣體的混合物混合。氧氣供給的目的是在確保氣體 燃燒的完全和各生成氣體的冷卻。 就目前來說’有兩種方法用來去除煙道氣中的氮氡化物 ，即：觸媒去氮氧化物法（SCR ’選擇性催化還原法）和非 催化去氮氧化物法（SMCR ’選擇性非催化還原法）。兩者都 是使用氨、或氨水溶液、或尿素水溶液作為還原劑，將在 煙道氣中的II氧化物還原為氮氣（ν2 )和水（η2 〇)。（參見_ K. J. Thome-Kozmiensky · Thermische Abfal lbehandlung 〔熱廢棄物處理〕，EF Verlag fur Energie- und U m w e 111 e c h n i k G m b H ’ 1 9 9 4 年，第二版，第 5 5 2 - 5 5 5 頁）。448273 V. Description of the invention (1) The present invention relates to a heat treatment method for solids, especially garbage, wherein the solids are incinerated by supplying main air in the first stage, and immediately after the first stage, the flue The gas system is' mixed with the secondary air and incinerated in the afterburner so that they are completely burned: and the SNCR method, in which a reducing agent is injected into the flue gas, is used to remove nitrogen oxides from the flue gas (DeNOx) to reduce nitrogen oxides from flue gas. It is known in the prior art that primary air is added to the combustion chamber and secondary air 'is added to the downstream post-combustion chamber to incinerate agglomerated solids such as garbage or the like. In this incineration process, the 'solids are usually transported on an incinerator, and the main air is supplied from the bottom of the grate' through the grate covering and enters the bed of solids above the furnace gas. During the incineration process, the temperature and composition of the flue gas formed in the bed and the bed have a considerable change in position and time. Therefore, the flue gas is mixed with the secondary air or a mixture of the secondary air and the recirculated gas. The purpose of the oxygen supply is to ensure the complete combustion of the gas and the cooling of each generated gas. As of now, there are two methods for removing nitrogen oxides in flue gas, namely: catalyst denitrification method (SCR 'selective catalytic reduction method) and non-catalytic denitrification method (SMCR' Selective non-catalytic reduction). In both cases, ammonia, or an aqueous ammonia solution, or an aqueous urea solution is used as a reducing agent to reduce the II oxide in the flue gas to nitrogen (ν2) and water (η2 0). (See _ KJ Thome-Kozmiensky · Thermische Abfal lbehandlung [thermal waste treatment], EF Verlag fur Energie- und U mwe 111 echnik G mb H ′ 1949, 2nd edition, 5 5 2-5 5 5 page).
2 7 3 五 '發明說明（2) 在SNCR法中，該還原劑係送入焚化工廠的燃燒室中’還 原劑在燃燒室中和已先形成的氮氧化物起反應’而生成氣1 氣和蒸汽。這個反應在70 0到U 〇〇 °C的溫度範圍内進行’ 而當所採用的還原劑是氨時，宜在8 5 0到1000 °C，最佳的 是9 2 0 °C。當所採用的還原劑是尿素時，該溫度範圍大約 朝較高溫度遷移5 0 °C。反應物通常是藉助兩個流體噴嘴分 配進燃燒室内’該兩流體噴嘴係設置在燃燒室外面，並使 用壓縮空氣或蒸汽作為噴霧介質。使用這兩種噴霧介質的 成本’是非常不利的偏咼’因為大型尺寸的反應室，就是 需要較大數量的此類介質<3因此，考慮成本起見，煙道氣 也被利用為當作還原劑使用的化學物品的噴霧和運送介 (WO 9 0 / 0 5 0 0 0 )。美國專利5i24 0,6 8 9號曾發表一種兩 去除氮氧化物的方法，其中再次使用再循環的煙道 ^ 為待注射的化學物品的裁體氣體。要控制煙道氣的: 可用水來噴灑或改變化學物品的數量。 ’皿又 當使用SNCR法時，垃极焚化廠更要面臨的問題 化垃圾時’ A多數的氮氡化物係由燃料氮所產纟；由二： 圾的不均勾性，這種的形成[就局部而言是極端多變的 ,而且在時間上始終變動得非常厲害。結果，在煙 ==，化物（NOx)的濃度，在位置和時間上’也變動得相 為了想要在這種條件之下 作用，就必需加入相當超量 需有大量的氨連續補充進煙 ，仍然達成一充分良好的還原 的還原劑。這樣無形中導致必 迺氣令’而且必需在高昂的成2 7 3 Five 'invention description (2) In the SNCR method, the reducing agent is sent to the combustion chamber of the incineration plant, and the reducing agent reacts with the previously formed nitrogen oxides in the combustion chamber to form gas 1 gas. And steam. This reaction is carried out in a temperature range of 70 to OO ° C. When the reducing agent used is ammonia, it is preferably 850 to 1000 ° C, and most preferably 920 ° C. When the reducing agent used is urea, this temperature range is shifted to about 50 ° C towards higher temperatures. The reactants are usually dispensed into the combustion chamber by means of two fluid nozzles, which are placed outside the combustion chamber and use compressed air or steam as a spray medium. The cost of using these two spray media is 'very unfavorable' because a large-sized reaction chamber requires a larger number of such media < 3. Therefore, considering the cost, flue gas is also used as Spraying and transporting of chemicals used as reducing agents (WO 9 0/0 5 0 0 0). U.S. Patent No. 5i24 0, 6 8 9 has published a two-method for removing nitrogen oxides, in which a recycled flue gas is used again as a tailor-made gas for the chemical to be injected. To control flue gas: Water can be used to spray or change the amount of chemicals. 'When the SNCR method is used, the garbage incineration plant is more of a problem.' A Most of the nitrogen compounds are produced by fuel nitrogen; by the two: the unevenness of garbage, this formation [It is extremely changeable locally, and it changes very drastically throughout time. As a result, in the smoke ==, the concentration of the compound (NOx) also changes in position and time. In order to work under these conditions, it is necessary to add a considerable amount of ammonia. Still achieve a sufficiently good reducing agent. This virtually leads to a suffocating order ’and must
五、發明說明（3) 本下再將氨分離出來，以避免在下游的煙道氣清除階段中 有氨的排放物。 最後，在後燃室區域及反應物噴射點，有額外顯著的溫 度和能量的變動，歸因於廢棄物的不均勻性及熱性能的變 異（例如，在非全部負荷下的操作）。這些變動會導致反應 的最佳溫度範圍不斷地變動，同時導致在喷射點的溫度不 能維持定常不變。為了要能夠跟縱在最佳溫度場範圍内的 局部變動，於是還原劑以多數個層級喷射進燃燒室中。這 些層級的開啟和關閉，端視目前溫度決定。這個解決方法 的缺點是，一方面，必須在邊牆上設置額外的開孔，而另 一方面，程序工程和控制工程的花費相當昂貴。 本發明即在尋求避免這種種的缺失。因而，本發明的一 個目標是在提供一種方法，使用SNCR法從焚化工廠中去除 煙道氣的氮氧化物，在該SNCR法中，有一還原劑，藉助一 運送介質通過一噴射點，噴射入該煙道氣中；這種方法費 用低廉，而且愈低層級連續送補的氨，同時，愈低的NOx 含量的清潔氣體濃度，都可以達成，而無需昂貴的程序工 程及裝備費用。 根據本發明，在一種如申請專利範圍第1項的序言所述 的方法，是藉以下事實達成：自第一階段發生的該煙道氣 ，係在第二階段與一氣態的無氧或低氧混合介質，較宜是 再循環的氣體或蒸汽，作初始混合，而此混合物在一拖延 區中滯留達至少0. 3秒，然後在第三階段與次級空氣混合 ，俾以完全燃燒；該還原劑已在此之前加進該次級空氣中V. Description of the invention (3) The ammonia is now separated to avoid ammonia emissions during the downstream flue gas removal stage. Finally, in the afterburner area and the reactant injection point, there are additional significant temperature and energy changes due to non-uniformity of the waste and variations in thermal performance (for example, operation at non-full load). These changes will cause the optimal temperature range of the reaction to continuously change, and at the same time, the temperature at the injection point cannot be kept constant. In order to be able to follow the local fluctuations in the optimum temperature field range, the reducing agent is injected into the combustion chamber in several stages. The opening and closing of these levels depends on the current temperature. The disadvantage of this solution is that, on the one hand, additional openings must be provided in the side wall, and on the other hand, the program engineering and control engineering are quite expensive. The present invention seeks to avoid such deletions. Accordingly, it is an object of the present invention to provide a method for removing nitrogen oxides from flue gas from an incineration plant using the SNCR method. In the SNCR method, a reducing agent is sprayed into a In this flue gas, this method is low in cost, and the lower the level of continuous ammonia supply, the lower the NOx content of the clean gas concentration can be achieved without the need for expensive program engineering and equipment costs. According to the present invention, a method as described in the preamble of the first scope of the patent application is achieved by the fact that the flue gas that has occurred since the first stage is in the second stage with a gaseous anaerobic or low An oxygen mixed medium, preferably a recirculated gas or steam, is used for initial mixing, and this mixture is retained in a prolonged zone for at least 0.3 seconds, and then mixed with secondary air in the third stage to burn completely; The reducing agent has been added to the secondary air before
448273 五、發明說明（4) 本發明的優點在於：第一 為還原劑没有額外的運送及 煙道氣幾可無需任何成本大 流量的次級空氣相混合，較 況。這改進的混合，可導致 。這樣，有可能達成低氮氧 同時結合低層級的連續送補 係分階段進給到後燃室中， 就已發生，尤其是混合介質 f射的時候，以致在次級空 極少的具有峰值溫度的火談 到第二階段的還原劑，只有 的還原劑可以酌予降低而仍 〇 再好不過的是，如果煙道 質之後或繼次級空氣加進之 氣態混合介質或次級空氣數 一種實施起來既簡單又省錢 把次級空氣不斷噴射的場所 氮氧化物反應的最佳溫度範 因此不再需要使用多數個嗔 。這樣可有利免除對噴射還 最後，如果還原劑供給的 ，該方法成本非常的低廉，因 喷射介質的需要，而再循環的 量採用。還原劑係與一大容積 大數量的氣體可以改進混合狀 氨的連續送補的層級大為降低 化物（NOx)的清潔氣體濃度， 的I。因為混合/燃燒氣體， 有些後燃早在第一混合階段中 (再循環煙道氣、過熱蒸汽）已 氣噴射的第二階段中，毫無或 形成。結果是很有利的，供給 一小數量被燃燒掉，超量使用 可維持同樣的N 0 X減少的程度 氣的溫度，在加進氣態混合介 後，係控制在一作為已加入的 量的一函數的特定值時。這是 的方法。這種控制，使得想要 中的煙道氣溫度，保持在去除 圍之内，成為可能。這方法也 射層級來跟蹤反應範圍的變動 原劑各層級間的變換。 量，在氣態混合介質加入之後448273 V. Description of the invention (4) The advantages of the present invention are: firstly, there is no additional transport of the reducing agent and the flue gas can be mixed without any cost and large flow of secondary air. This improved blending can lead to. In this way, it is possible to achieve low-nitrogen and oxygen combined with a low-level continuous supply system to feed the post-combustion chamber in stages, which has already occurred, especially when the mixed medium f is injected, so that the secondary space has a peak temperature rarely The fire talked about the reducing agent in the second stage. The only reducing agent can be reduced as appropriate. It is still better. If the flue quality is followed by the gaseous mixed medium or secondary air added by the secondary air, The best temperature range for nitrogen oxides reaction in a place where it is simple and cost-effective to inject secondary air continuously, therefore, it is no longer necessary to use a large number of plutonium. This can be beneficial to eliminate the need for injection. Finally, if a reducing agent is supplied, the method is very cheap, because the amount of recycling is used because of the need for the injection medium. The reducing agent system and a large volume and a large amount of gas can improve the mixing state. The level of continuous replenishment of ammonia is greatly reduced, and the clean gas concentration of NOx is reduced. Because of the mixing / combustion of the gas, some post-combustion is absent or formed as early as the second phase of the first injection of the mixed gas (recirculated flue gas, superheated steam). The result is very favorable. Supply a small amount to be burned out. Excessive use can maintain the same temperature of N 0 X to reduce the temperature of the gas. After adding the mixed gas in the gaseous state, it is controlled to the amount that has been added. A specific value of a function. This is the method. This control makes it possible to keep the desired flue gas temperature within the removal range. This method also shoots layers to track changes in the reaction range. After adding the gaseous mixed medium
第8頁 五、發明說明（5) 或在次級空氣加入之後，係受控制在一特定期望的值，A 該一值是煙道氣溫度的一函數時，也是很有利的；因為， 還原劑燃燒耗去的量以及連續供給的氨的層級，係視反應 溫度而定的。 此外，控制供補還原劑的量，使成為該加熱爐的熱容量 、在該爐末端的NOx的濃度、及在該爐末端的氨的濃度的 函數時，也是很有利的；因為當容量增加時，所需的還原 劑的量也要提昇。 圖式顯示本發明一範例具體實例，關連於一垃圾焚化工 廠。圖中只顯示出有助於瞭解本發明的主要元件。作為範 例，鍋爐附有排除灰塵的煙甶及洗滌器，煙道氣在洗滌器 中發生去硫作用未予顯示。介質的流動方向由箭號指示。 以下將參照範例具體實例及該圖式，對本發明作更為詳 盡的說明。 該單一圊式表示一垃圾焚化工廠的一部分，其中正在進 行非催化性去氮氧化物處理。該工廠包含一焚化爐篦1 (第 一焚化階段），爐篦上擴展一燃燒室2，有一根據本發明的 拖延區3 (焚化的第二階段）與該燃燒室2連接，該拖延區3 又再與一後燃區4連接（焚化的第三階段），煙道氣係在該 後燃區内完全燃燒。 待焚化的固.體5，在目前作為範例的具體實例_是為垃— 圾，係擺放到焚化爐篦1上並藉供給主空氣6而遭焚化。該 主空氣6的數量可以亞於化學計量或超過化學計量的方式 選定，換言之，在一種氧氣不足或氧氣超多的方式下進行5. Description of the invention (5) or after the secondary air is added, it is controlled to a specific desired value, A, which is also very advantageous when the value is a function of the temperature of the flue gas; The amount consumed by the combustion of the agent and the level of continuously supplied ammonia depend on the reaction temperature. In addition, it is also advantageous to control the amount of supplementary reducing agent as a function of the heating capacity of the heating furnace, the concentration of NOx at the end of the furnace, and the concentration of ammonia at the end of the furnace; because when the capacity increases The amount of reducing agent required should also be increased. The drawing shows an exemplary embodiment of the present invention, which is related to a waste incineration chemical plant. Only the main elements which are helpful for understanding the present invention are shown in the figure. As an example, the boiler is equipped with soot and scrubber to remove dust. The desulfurization of flue gas in the scrubber is not shown. The direction of flow of the medium is indicated by an arrow. Hereinafter, the present invention will be described in more detail with reference to specific examples and the drawings. The single unit represents a part of a waste incineration plant in which non-catalytic nitrogen oxide removal is being performed. The plant comprises an incinerator grate 1 (first incineration stage), a combustion chamber 2 is extended on the grate, a procrastination zone 3 (second stage of incineration) according to the invention is connected to the combustion chamber 2 and the procrastination zone 3 It is connected to a post-combustion zone 4 (third stage of incineration), and the flue gas is completely burned in this post-combustion zone. The solid body 5 to be incinerated is a concrete example currently used as an example. It is waste-paste, which is placed on the incinerator grate 1 and incinerated by supplying the main air 6. The amount of the main air 6 can be selected in a manner that is sub-stoichiometric or over-stoichiometric, in other words, carried out in a manner of insufficient oxygen or excessive oxygen.
五、發明說明（6) 燃燒。燃燒過程中，煙道氣7形成並流進後燃室4，在該後 燃室中，與一無氧或低氧的氣態混合介質8混合。該氣態 混合介質8，是一具有較低於空氣中氧的濃度的氣體混合 物，最好是再循環的煙道氣。在本發明的另一變型具體實 例中，也可能使用超熱蒸汽。從第一焚化階段來的煙道氣 7加上氣態混合介質8的混合體9，此時行進通過拖延區3， 平均停留時間至少為〇. 3秒。然後，將次級空氣1 0，其已 先與一還原劑1 1，例如氨，相混合，嗔射進後燃室4内。 這個混合物的加入，首先，完成了發生自燃燒區的各種氣 體的進一步的混合與均質化，其次，確保此等氣體的完全 燃燒。另外，該等氣體受到冷卻，而且，包含在煙道氣中 的氮氧化物也因為還原劑11與廢氣中的NOx组成成分的起 反應而降低。 對於還原劑1 1的供給，有許多可行的辦法。如在圖式中 所示，可以在還原劑1 1分配到各個喷射位置之前，把還原 劑1 1加進次級空氣的氣流1 0中°另一可行的辦法，是在還 原劑11分配到各個噴射位置之後，把還原劑11加進次級空 氣的氣流1 0中。當然，也可以在還原劑1 1射進後燃室之處 ，直接將還原劑1 1加進次級空氣的氣流1 0中。 此外，關於還原劑1 1有多種可能的具體實例。舉例來說 ，該還原劑1 L可以氣態和次級空氣1 0混合，如氣態的氨，_ 或可呈液體形態，例如，成為水性尿素溶液或氨溶液，並 藉喷嘴將其喷灑進次級空氣的氣流i 0中。最後，還原劑1 1 還可以成為固態形式，例如粉狀尿素，而成為細微的粒子5. Description of the invention (6) Combustion. During the combustion process, the flue gas 7 is formed and flows into the afterburning chamber 4, where it is mixed with an oxygen-free or hypoxic gaseous mixing medium 8. The gaseous mixing medium 8 is a gaseous mixture having a lower concentration than the oxygen in the air, preferably a recycled flue gas. In another variant embodiment of the invention, it is also possible to use superheated steam. The flue gas 7 from the first incineration stage plus the mixture 9 of the gaseous mixed medium 8 traveled through the delay zone 3 at this time with an average residence time of at least 0.3 seconds. Then, the secondary air 10, which has been mixed with a reducing agent 11 such as ammonia, is injected into the post-combustion chamber 4. The addition of this mixture, first, completes the further mixing and homogenization of the various gases occurring in the self-combustion zone, and second, ensures the complete combustion of these gases. In addition, these gases are cooled, and the nitrogen oxides contained in the flue gas are also reduced by the reaction between the reducing agent 11 and the NOx components in the exhaust gas. There are many feasible ways to supply the reducing agent 11. As shown in the figure, the reducing agent 11 can be added to the secondary air stream 10 before the reducing agent 11 is distributed to each injection position. Another feasible method is to distribute the reducing agent 11 to After each injection position, the reducing agent 11 is added to the secondary air stream 10. Of course, where the reducing agent 11 is injected into the afterburner, the reducing agent 11 may be directly added to the secondary air stream 10. In addition, there are various possible specific examples of the reducing agent 11. For example, the reducing agent 1 L may be mixed in a gaseous state with secondary air 10, such as gaseous ammonia, or may be in a liquid form, for example, become an aqueous urea solution or an ammonia solution, and spray it through a nozzle. Air flow i 0 in the first stage. Finally, the reducing agent 1 1 can also become a solid form, such as powdered urea, and become fine particles.
4482 73 ----- —------- 五、發明說明（7) 以儀錶計量送進次級空氣1 0中。 在根據本發明的方法中，煙道氣9的溫度，在加入氣態 混合介質8之後’可以控制到為氣態混合介質8已加進數量 的函數的一特定需要值。 也有可能將煙道氣1 2控制到為氣態混合介質8或次級空 氣10已加進數黃的函數一特定需要值。 因為以這種方式’在還原劑噴射點的溫度町以係持實質 上的定常不變，4以有利地不再需要去作還原劑喷射各種 不同層級之間的轉換，換言之，用於固體熱處理的方法， 已安排得比已妒的手先技藝簡單得多。 另一優點是，與—大容積流量的次級空氣1 0相混合的還 原劑1 1，比較起來’算是小的數量，結果將這種大數量氣 體混合進煙道氣的情況，獲得了改善。 在還原劑的噴射通過次級空氣但没有不同階段的焚化空 氣供應給後燃f的情況下’所實施的試驗，只有在噴射點 在低溫下時，才能獲得成功。可是’如果這些試驗是在法 定條件下實施（在緊接最後加入焚化空氣之後，煙道氣最 小的滯留時間，在溫度> 8 5 0 °C之下為2秒），次級空氣所 產生的火燄，會到達溫度峰值並導致高比例的燃燒耗去的 還原劑’甚至導致一煙道氣中⑽X層級的非良性的昇高。 只有當混舍介質/燃燒空氣係分階段供給時，才會有大 多數的後燃發生在第一昆合階段（即噴射^合介質的階段 ’結果是’毫無火談或是相當少的具有相關溫度峰值的火 談’在第二昆合階段（即唢·射次級空氣階段）形成。因此，4482 73 ----- -------- 5. Description of the invention (7) Metered into secondary air 10. In the method according to the invention, the temperature of the flue gas 9 after adding the gaseous mixing medium 8 'can be controlled to a specific required value as a function of the amount of gaseous mixing medium 8 that has been added. It is also possible to control the flue gas 12 to a specific required value as a function of the gaseous mixed medium 8 or the secondary air 10 which has been added several times. Because in this way the temperature at the point of injection of the reducing agent is essentially constant, 4 it is no longer necessary to switch between different levels of reducing agent injection, in other words, for solid heat treatment The method has been arranged much simpler than the jealous first-hand technique. Another advantage is that the reducing agent 11 mixed with the large volume flow of secondary air 10 is compared to 'a small amount. As a result, the situation of mixing this large amount of gas into the flue gas has been improved. . The test carried out with the injection of the reducing agent through the secondary air but without incineration air at different stages to the post-combustion f 'was only successful when the injection point was at a low temperature. However, 'If these tests are performed under legal conditions (minimum residence time of flue gas immediately after the last addition of incineration air, 2 seconds at temperature > 8 50 ° C), secondary air production The flame will reach the peak temperature and cause a high proportion of the reducing agent consumed by the combustion, and even lead to a non-benign increase in the level of 层 X in a flue gas. Only when the mixed medium / combustion air system is supplied in stages, most of the post-combustion occurs in the first Kunhe stage (ie, the stage of injecting the mixed medium 'results' is no fire talk or very little A fire talk with a relevant temperature peak is formed during the second Kunhe stage (ie, the 射 · secondary air stage). Therefore,
4482 73 五、發明說明（8) 遭燃燒耗盡的還原劑卻是非常的少。 要控制還原劑1 1供給的數量，有許多的可行方法，可以 很容易地付諸實施，例如： -按離開後燃階段之後的煙道氣中氮氧化物濃度的一函數 來控制； -按離開後燃階段之後的煙道氣中氨濃度的一函數來控制 i -按加入氣態混合介質之後煙道氣溫度的一函數來控制； -按加入次級空氣之後煙道氣溫度的一函數來控制； -按已加進氣態混合介質的數量的一函數來控制； -按加熱爐容量之一函數來控制。 在一垃圾焚化工廠實施的試驗已證明，使用本發明方法 ，有可能以<5毫克/立方米（標準溫度及壓力下（st.p.)) 的氨（連續供給）’達成<80毫克/立方米（s.t.p.)水準的 NOx(根據11%的乾燥氧氣）。 當然，本發明並不受上述作為範例的具體實例的限制。 舉例言之，固體5的焚化，可以在一取代焚化爐篦1的液化 基床上實施。 參照數碼一覽表 1 爐篦（Incineration grate) 2 燃燒室CCjDmbustionchamber) _ 3 拖延區（Holding zone) 4 後燃室（Afterburning chamber) 5 固體（So lids)4482 73 V. Description of the invention (8) The reducing agent exhausted by combustion is very small. To control the amount of reducing agent 11 supplied, there are many feasible methods that can be easily implemented, for example:-control as a function of the concentration of nitrogen oxides in the flue gas after leaving the post-combustion stage;-according to Control as a function of ammonia concentration in the flue gas after leaving the post-combustion phase i-Control as a function of the temperature of the flue gas after adding the gaseous mixed medium;-As a function of the temperature of the flue gas after adding the secondary air Control;-control as a function of the amount of mixed gaseous medium added;-control as a function of heating furnace capacity. Tests carried out in a waste incineration plant have demonstrated that using the method of the invention, it is possible to achieve < 80 with < 5 mg / m3 (standard temperature and pressure (st.p.)) of ammonia (continuous supply). Mg / m3 (stp) level of NOx (based on 11% dry oxygen). Of course, the present invention is not limited to the specific examples described above as examples. For example, the incineration of solid 5 can be carried out on a liquefied bed instead of incinerator grate 1. Refer to the digital list 1 Incineration grate 2 CCjDmbustionchamber _ 3 Holding zone 4 Afterburning chamber 5 So lids
448 2- 五、發明說明（9) 6 主空氣（Primary air) " 7 煙道氣（Flue gases) 8 氣態混合介質（Gaseous mixing medium) 9 項次7加項次8的混合物（在加入氣態混合介質之後的 煙道氣）Mixture of Item 7 and Item 8 (flue gases following addition of the gaseous mixing medium) l〇 次級空氣（Secondary air) 11 還原劑（Reducing agent) 1 2 項次9加項次1 0加項次11的混合物（加入次級空氣之 後的煙道氣）Mixture of Item 9 and Item 10 and Item 11 (flue gases following the addition of secondary air)448 2- V. Description of the invention (9) 6 Primary air " 7 Flue gases 8 Gaseous mixing medium 9 item 7 plus item 8 Flue gas after mixing medium) Mixture of Item 7 and Item 8 (flue gases following addition of the gaseous mixing medium) l〇 Secondary air 11 Reducing agent 1 2 items 9 plus items 1 0 Mixture of Item 9 and Item 10 and Item 11 (flue gases following the addition of secondary air)
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