【正文】 ence powdered coal firing process39。s immanent cause, like powdered coal physical structure and so on. Powdered coal degree of fineness to bustion characteristic influence. coal degree of fineness to catches fire and the bustion characteristic influenceThe appraisal powdered coal catches fire one of performance important targets is the flame temperature, and the coal grain separates out the moisture content and the volatility share gradually in the elevation of temperature process, along with furnace temperature39。s height is consistent when the outside heat source heating condition, the fuel is lit the difficulty degree one kind of external showing, may use for to pare coal39。s reduction, the powdered coal firing thermogravimetric curve39。s diameter reduces, the rapidity of bustion increases, the burnout temperature reduces, the bustion posite index increases, the bustion, burns through the performance to be good, the powdered coal is easier to burn through.3. Along with powdered coal degree of fineness39。s activation energy reduces, it reduces the degree and the coal plant and so on to concern. The activation energy is smaller, the powdered coal month easy to catch fire the bustion.（二）Coal bustionThe coal bustion should take maximum limit, rapidly emit its heat energy as a goal. The coal produces the gaseous pound and the solid coal residuum in the bustion process. In what gaseous pound simple is the methane and the acetylene, under high temperature, but also produces the blue gas. The solid coal39。s residuum bees the gas condition to separate the gaseous pound from the coal to be much slower than first, therefore the volatile matter your coal, the bustion is very slow, ., including solid coal residuum many coals, pared to contains the solid coal residuum few coals to burn slowly.Second, coal distortion The coal must distort in the bustion, some coals transform into the plastic condition, cakes in together。s advance, the coal has the crevasse, turns the finely ground particles, when exposes the new thingses the surface, the accelerated bustion process advance. But, the powdered coal increases to the certain extent, instead has filled between the big lump coal crevice, enables the air to pass with difficulty, hindrance bustion, even destroys the bustion process advance.Third, coal granularity and bustion relational The coal bustion process is the coal surface chemical reaction. The reaction rate and the rebellion should the coal surface size and supplies air quantity concerns. The rebellion should the coal surface area is bigger, supplies the air quantity to be more, then responded the speed is also quicker. The coal briquette is bigger, although the permeability is good, but rebels should the coal surface area is small, needs the air volume is also small. The coal pellet is smaller, although its surface area is big, but because each other stack is very close, the rebellion should the coal surface area is very in fact small, the air which enters are also very few. Fourth, in coal mineral confrontation bustion influence when bustion, in the coal gangue and the mineral hold must transform the liquid condition, enables the quantity of heat to emit fully, or decreases the quantity of heat to emit the speed, affects the bustion process. Mineral substance this kind of influence, burns when the volatile matter small anthracite, the lean coal is more prominent. In the coal contains the mineral substance to be more, then the unit weight or unit volume39。s bustion efficiency and the rapidity of bustion also therefore reduce.Fifth, in coal moisture content to bustion influence In the coal has the moisture content, then must reduce the quantity of heat which similarly the unit weight or unit volume39。s nature and the ingredient are dissimilar, the user may act according to these factors to carry on the choice, and sets the request to the coal processing. Each kind of user is not extremely same to the anthrax request. To choose the coal reasonably, must understand the coal the nature. For the determination coal39。 Inflammable body volatile matter。 Using coal low position calorific capacity。 Entire sulfur content。 Coal granularity.（三）Anthrax research importance The thermoelectric power station large and middle scale powdered coal boiler existence39。s design and the examination anthrax as well as the movement essential requirements, have conducted a series of related research, establishes the reasonable anthrax appraisal system, uses in instructing the power plant coal management, not only the guarantee electric power production39。從而使電站鍋爐是壞面對燃燒的穩(wěn)定性，特別是低負(fù)荷困難不穩(wěn)定的，但很容易熄火，鍋爐調(diào)峰性能差。因此，提高它的燃燒特性，提高鍋爐燃燒效率，減少鍋爐污染物的撤離是燃煤鍋爐的關(guān)鍵技術(shù)。細(xì)度煤粉燃燒特性的影響程度?；鹧鏈囟鹊母叨仁且恢碌漠?dāng)外部熱源條件下,燃料是點(diǎn)燃了困難程度的一種外在表現(xiàn),可以用來比較煤的燃燒狀況直接。在熱重分析，最大失重速度，反映了煤的燃燒速度。放熱峰寬較小，從煤炭開始燃燒需要燃燒時(shí)間短，燃燒穩(wěn)定性，并通過自然燒傷更好。 ，煤粉顆粒的直徑減小，增加燃燒速度，燃燒綜合指數(shù)上漲，燃燒灼傷，通過性能好，煤粉更容易燒穿?；罨茉叫?，煤粉月易著火燃燒。煤在燃燒過程中產(chǎn)生的氣體化合物和固體煤渣油。固體煤的殘留物燃燒時(shí)的空氣，最后必須把藍(lán)色的氣體。不同類型的煤礦，也是藍(lán)色的氣體燃燒過程中，只從煤炭轉(zhuǎn)化為藍(lán)色氣體過程不同于。 第二，煤炭失真煤在燃燒，必須扭曲在一起的煤轉(zhuǎn)化成塑料的條件，蛋糕。當(dāng)煤轉(zhuǎn)化成塑料的條件，月餅散裝，從而阻礙燃燒過程的推進(jìn)，煤決口，把磨細(xì)顆粒時(shí)，公開出新的表面，加速燃燒過程提前。 第三，煤的粒度和燃燒關(guān)系煤燃燒過程煤表面的化學(xué)反應(yīng)。叛亂煤炭表面積越大，提供空氣量更多，然后回應(yīng)速度也更快。煤顆粒較小，雖然其表面積大，但因?yàn)槭欠浅Ｃ芮械南嗷クB加，叛亂煤炭表面積應(yīng)該是非常事實(shí)上小，空氣進(jìn)入也很少。礦物質(zhì)這樣的影響，燃燒時(shí)揮發(fā)物小無煙煤，貧煤是比較突出的。鍋爐的燃燒效率和燃燒速度也因此降低。但是，如果爐內(nèi)溫度高，包括在一定的含水量，影響程丙午燃燒煤炭。以上這些因素，決定每個(gè)用戶的一種適用于煤炭有效的熱容量可能程度。每個(gè)用戶炭疽要求是極不相同。用于測定煤的使用，一般需要知道以下一些基本炭疽配額。易燃體揮發(fā)性物質(zhì)，膠質(zhì)層厚度。干煤灰。煤灰熔點(diǎn)煤的粒度。近年來，由于煤炭市場的需求遠(yuǎn)遠(yuǎn)大于供給，電力今年的煤炭質(zhì)量下降的一年，這種情況下，將改善與困難，在不久的將來。通過制定電煤特性測定和發(fā)電用煤炭的基本要求，誘導(dǎo)和分析了發(fā)電用煤炭應(yīng)用的現(xiàn)狀和弊端。