【正文】
ash point temperature clearly influenced by the reaction rate and the influence of heat loss。 Oxygenenriched air than ordinary air helps to reduce burn temperature characteristics, and increase the heat release flame quantity of unit volume。 For inferior fuel effect more prominent。 4. Reduce the displacement after bustion Use oxygen levels for 29% of oxygenenriched air to burning, and ordinary air burning parison, when excess air coefficient is a = 1, 20% less volume, the exhaust smoke heat loss also decreased by 20%, thus improving the thermal efficiency and energy saving。 5. Increase heat utilization rate When heating temperature of 1300 DHS, use mon air when C bustion. Its thermal utilization at 42%, but by oxygenation 26% of oxygenenriched air bustion, the utilization rate increased to 56%, with heating temperature increases, energysaving better effect。 6. Reduce air surplus coefficient Oxygenenriched bustion can effectively reduce air surplus coefficient, make exhaust heat loss, so as to improve drastically lower thermal efficiency and energy saving kiln。 Third, roller kiln local increasing oxygen technology basic characteristics . Currently get oxygen into kiln have oxygen fuel spray gun, air oxygen fuel spray gun, secondary air zofran and gun under local gush oxygen etc four basic methods. The top three species overall increase gas measures, the latter for local add oxygen。 In the bustion system designing a roller kiln, must consider the following five factors。 (1).Will fuel heat maximum transfer to the glass。 (2). Will the burning heat transfer to the minimum upper structure。 roller (3). Avoid flame washed into refractory material surface。 (4). The fuel and the bustion air effective mix, in order to reduce the flue caused by air in the excess heat loss。 Fourth, conclusion (1) oxygenenriched bustion technology and total oxygen burning technology in industrial furnaces, will give the successful application of enterprise to bring huge economic benefits and social benefits, have broad application prospect。 (2) oxygenenriched bustion pared with traditional bustion way way, have energysaving, increase flue gas radiation ability and shorten the heating time, increase production, etc。 (3) in the future application of metallurgical industry furnaces oxygenenriched bustion technology, pay attention to the following problems: highly efficient and clean system optimal oxygenenriched bustion furnace type。 Widen fuel use scope, undertake furnace pressure and furnace gas ponent effective control。 Meanwhile the key development practical, reliable low NOx emissions of engineering technology。 One pure oxygen concentration dilution mixer and oxygenrich burner is the key technology, should put certain human conduct targeted research and development。 (4) some Chinese are battling for the city and the city built international famous scenery tourist city is likely to take the lead in using the developed countries, the environmental protection standard of other parts of the environmental protection also is valued. Total oxygen burning technology will be in our country has promoted。 富氧燃燒在輥道窯方面的應(yīng)用近幾年,國內(nèi)陶瓷行業(yè)輥道窯的發(fā)展較快,針對目前能源日趨緊張的狀況。一、富氧助燃技術(shù)在國外工業(yè)中的應(yīng)用早在1982年,美國、日本、英國、法國等國家就從事膜法富氧技術(shù)的研發(fā)和運用. 他們從膜材料、成膜技術(shù)、組件和裝置等方面進行了產(chǎn)品試制、生產(chǎn)放大、流程設(shè)計、過程優(yōu)化和燃燒應(yīng)用等研究工作,并進行了分析檢測手段和分析儀器的開發(fā)等,最終開發(fā)出氧濃度為28%40 %富氧空氣,裝置,產(chǎn)氣量從幾升/分至1000m 3/h不同規(guī)格的產(chǎn)品,并進行了工業(yè)應(yīng)用試驗,在燃氣、燃油和燃煤的不同場合下試驗,證實了30 %濃度的富氧空氣,即可用于工業(yè)助燃,其中用23% 的富氧空氣助燃可節(jié)能10% 25% .到20世紀(jì)80年代末,日本大阪煤氣公司和松下電器公司合作,在鋼坯加熱試驗爐、陶瓷燒成爐、玻璃窯爐上進行了實際應(yīng)用,并取得了良好的節(jié)能效果。二、富氧助燃技術(shù)節(jié)能和治理污染的機理 提高火焰溫度: 富氧空氣參于燃燒后,氮氣量相對減少,從而使氧分子迅速地與可燃物混合達到充分燃燒,使火焰溫度隨著富氧空氣中的氧分子比例的增加而提高,并加快了輻射、傳導(dǎo)、對流三種形式的熱傳率。 加快燃燒速度 燃料在富氧空氣中燃燒速度加快的原因:是由于增加氧含量后,使火焰溫度提高所致,如天然氣在氧氣中的燃燒速度比在普通空氣中的燃燒速度能提高10倍。燃燒速度的提高,導(dǎo)致燃料在爐膛內(nèi)迅速完全燃燒。 降低燃料的燃點溫度 燃點溫度明顯受到反應(yīng)速率和熱損耗的影響。富氧空氣比普通空氣有助于降低“燃點”溫度的特點,并增加火焰單位體積的熱釋放量。對于劣質(zhì)燃料效果更為突出。 減少燃燒后的排氣量 使用含氧量為30%的富氧空氣參加燃燒,與普通空氣燃燒比較,當(dāng)過??諝庀禂?shù)a=1時,則排氣體積減少20%,其排煙熱損失也減少20%,從而提高熱效率而節(jié)能。 增加熱量利用率 當(dāng)加熱溫度為1300oC時,%,而用含氧量26%的富氧空氣燃燒,則利用率增加到56%,隨著加熱溫度增加,節(jié)能效果更顯著。 降低空氣過剩系數(shù) 富氧燃燒能有效地降低空氣過剩系數(shù),使排煙熱能損失大幅度降低,從而提高窯爐的熱效率而節(jié)能。三、 輥道窯局部增氧技術(shù)的基本特點 目前把氧氣引入輥道窯有氧氣燃料噴槍、空氣氧氣燃料噴槍、后一種為局部增氧。在設(shè)計一座輥道窯的燃燒系統(tǒng)時,必須考慮以下5個因素。 (1)、將燃料的熱能最大限度地傳遞到玻璃中; (2)、將燃燒的熱能最小地傳遞到輥道窯的上部結(jié)構(gòu)中; (3)、盡量避免火焰沖刷到耐火材料的表面上; (4)、燃料和助燃空氣有效的混合,以減少煙道中因空氣過剩而造成的熱損失。四、結(jié)論(1)富氧燃燒技術(shù)及全氧燃燒技術(shù)在工業(yè)爐窯中的成功應(yīng)用,將給企業(yè)帶來巨大經(jīng)濟效益和社會效益,具有廣闊的推廣應(yīng)用前景。(2)富氧燃燒方式與傳統(tǒng)燃燒方式比較,具有節(jié)能、增加煙氣輻射能力以及縮短加熱時間、增加產(chǎn)量等優(yōu)點。(3)今后工業(yè)爐窯應(yīng)用富氧燃燒技術(shù)時,注意以下幾個問題:高效、潔凈富氧燃燒系統(tǒng)的最佳爐型;拓寬燃料使用范圍,進行爐壓與爐氣成分有效控制;同時重點開發(fā)實用、應(yīng)投入一定的人力開展有針對性的研究開發(fā)。(4)我國一些正在爭取建成國際化都市的城市和著名的風(fēng)景旅游城市很可能率先采用發(fā)達國家的環(huán)保標(biāo)