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營口波海菱鎂材料有限公司          

聯系人:莊 延 山(先生)

地 址:大石橋市南樓經濟開發區高莊村

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Yingkou Bohai Magnesium Materials Co., Ltd.

Contact: Zhuang Yanshan (Mr.)

Location: Gaozhuang Village, Nanlou Economic Development Zone, Dashiqiao City

Phone call: +86 0417-5289488  +86 13904074678

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Zip code: 115100

輕燒鎂粉的選用及維護技術 Selection and maintenance technology of light burned magnesium powder

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輕燒鎂粉的選用及維護技術 Selection and maintenance technology of light burned magnesium powder

發布日期:2019-03-11 00:00 來源:http://www.hakatayanoodle.com 點擊:

在國內危廢處置行業應用廣泛?;剞D窯耐火材料的質量影響了回轉窯能否穩定運行。輕燒鎂球,對危險廢物處理回轉窯耐火材料的選用、維護進行了分析,以供具體工程應用參考。危險廢物根據《國家危險廢物名錄》的定義具有腐蝕性、毒性、易燃性、反應性、感染性等危險特性??赡軐Νh境或者人體健康造成有害影響,需要按照危險廢物進行管理。其中危險廢物熱處理(焚燒)處置手段不僅能徹底解除廢物的毒性和危害性,而且能Z大程度地減少危險廢物的體積,是廢物無害化、減量化的Z有力手段。目前國內新建的危險廢物焚燒處置工程大多優先選用回轉窯作為危險廢物處理爐型,其可以有效處理不同形狀、相態的危險廢物。


回轉窯式焚燒爐也稱為旋轉窯,是一個略為傾斜而內襯耐火磚的鋼制空心圓筒,大多數廢物物料是由燃燒過程中產生的氣體以及窯壁傳輸的熱量加熱的。固體廢物從前端送入窯中進行焚燒,以旋轉來達到攪拌廢物的目的。旋轉時須保持適當傾斜度,以利固體廢物下滑。此外,廢液及廢氣可以從窯頭或二燃室送入,甚至整桶裝的廢物也可送入回轉窯焚燒爐燃燒。


回轉窯焚燒技術是目前危險廢物焚燒技術中的Z主流技術,是應用Z多的爐型,輕燒鎂粉是一種適應性很強,能焚燒多種固體、半固體、液體、氣體廢物的多用途焚燒爐,各種不同型態及形狀(顆粒、粉狀、塊狀及桶裝)的可燃性廢物皆可送入回轉窯中焚燒。

It is widely used in domestic hazardous waste disposal industry. The quality of the refractories of the rotary kiln affects the stable operation of the rotary kiln. The light-burned magnesium balls were analyzed for the selection and maintenance of refractory materials for the rotary kiln for hazardous waste treatment for reference in specific engineering applications. Hazardous waste has corrosive, toxic, flammable, reactive, infectious and other hazardous properties according to the definition of the National Hazardous Waste List. It may cause harmful effects to the environment or human health, and needs to be managed as hazardous waste. Among them, the method of heat treatment (incineration) of hazardous waste can not only completely eliminate the toxicity and hazards of the waste, but also can reduce the volume of the hazardous waste to the greatest extent. It is the most powerful means for the harmlessness and reduction of waste. At present, most newly built hazardous waste incineration treatment projects in China use rotary kiln as a hazardous waste treatment furnace type, which can effectively treat different shapes and phases of hazardous waste.

Rotary kiln incinerator, also called rotary kiln, is a slightly inclined steel hollow cylinder lined with refractory bricks. Most waste materials are heated by the gas generated during the combustion process and the heat transmitted by the kiln wall. The solid waste is sent to the kiln from the front end for incineration, and it is rotated to achieve the purpose of stirring the waste. The rotation must be kept at an appropriate tilt to facilitate the sliding of solid waste. In addition, waste liquid and waste gas can be sent from the kiln head or the second combustion chamber, and even the whole barrel of waste can be sent to the rotary kiln incinerator for combustion.

Rotary kiln incineration technology is currently the most mainstream technology in hazardous waste incineration technology. It is the most widely used furnace type. Light-burned magnesium powder is a highly adaptable and can incinerate a variety of solid, semi-solid, liquid, and gas wastes. Use incinerators, various types and shapes (particles, powders, blocks and barrels) of combustible waste can be sent to a rotary kiln for incineration.

輕燒鎂球

危險廢物在回轉窯中焚燒,一般要經歷干燥、熱解、燃燒、燃盡等幾個階段。經過這幾個階段,危險廢物中的有害成分在高溫作用下被充分分解和破壞,形成高溫煙氣和爐渣。這些高溫煙氣和爐渣會對回轉窯內砌筑的耐火材料造成侵蝕性破壞。


(1)耐高溫性。能夠長期在 800 ℃以上的高溫環境下運行。


(2)高強度和優良的耐磨性。 回轉窯內耐火材料需要具有一定的機械強度,以承受高溫時的膨脹應力及回轉窯殼體變形形成的應力。


(3)良好的化學穩定性和熱穩定性,以抵抗煙氣中化學物質的腐蝕、能夠承受焚燒狀態下的交變熱應力。


(4)受熱膨脹穩定性要好。 回轉窯殼體的熱膨脹系數雖然大于回轉窯耐火材料的熱膨脹系數,但是殼體溫度一般都在150~300 ℃左右,而耐火材料承受的溫度一般都在 800 ℃以上,這樣可能會導致耐火材料比回轉窯殼體的熱膨脹要大,而容易脫落。


(5)氣孔率要低。氣孔率高會使煙氣易通過滲透進入耐火材料中,腐蝕耐火材料本體。


Hazardous waste is incinerated in a rotary kiln, which generally undergoes several stages such as drying, pyrolysis, combustion and burnout. After these stages, the harmful components in the hazardous waste are fully decomposed and destroyed under the action of high temperature, forming high temperature flue gas and slag. These high temperature flue gases and slag can cause erosive damage to the refractory materials built in the rotary kiln.

(1) High temperature resistance. Able to run in high temperature environment above 800 ℃ for a long time.

(2) High strength and excellent abrasion resistance. The refractory material in the rotary kiln needs to have a certain mechanical strength to withstand the expansion stress at high temperature and the stress caused by the deformation of the rotary kiln shell.

(3) Good chemical and thermal stability to resist the corrosion of chemical substances in the flue gas and to withstand the alternating thermal stress in the incinerated state.

(4) The thermal expansion stability is better. Although the thermal expansion coefficient of the rotary kiln shell is greater than the thermal expansion coefficient of the refractory of the rotary kiln, the shell temperature is generally around 150-300 ℃, and the temperature of the refractory is generally above 800 ℃, which may cause the refractory ratio The thermal expansion of the rotary kiln shell is large, and it is easy to fall off.

(5) The porosity should be low. High porosity will make the flue gas easily penetrate into the refractory material and corrode the refractory body.


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