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爆炸性粉塵環(huán)境的渣漿泵電機(jī)選擇
連續(xù)出現(xiàn)或長(zhǎng)期出現(xiàn)爆炸性粉塵環(huán)境的危險(xiǎn)區(qū)為10區(qū)，有時(shí)會(huì)將積留下的粉塵物揚(yáng)起而偶然出現(xiàn)爆炸性粉塵混合物的環(huán)境危險(xiǎn)區(qū)為11區(qū)。
爆炸性粉塵環(huán)境內(nèi)的電氣設(shè)備和線路，應(yīng)符合周圍環(huán)境內(nèi)化學(xué)的、機(jī)械的、熱的、霉菌以及風(fēng)沙等不同環(huán)境條件對(duì)電氣設(shè)備的要求。
在爆炸性粉塵環(huán)境內(nèi)，電氣設(shè)備最高允許表面溫度應(yīng)符合表5-17的規(guī)定。
防爆電氣設(shè)備選型:除可燃性非導(dǎo)電粉塵和可想纖維的11區(qū)環(huán)境采用防塵結(jié)構(gòu)(標(biāo)志為DP)的粉塵防爆電氣外，爆炸性粉塵環(huán)境10區(qū)及其他爆炸性粉塵環(huán)境11區(qū)均需采用塵密結(jié)構(gòu)(標(biāo)志為DT)的粉塵防爆電氣設(shè)備，并還需按照粉塵的不同引燃溫度選擇不同引燃溫度組別的電氣設(shè)備。
(4)火災(zāi)危險(xiǎn)環(huán)境的電機(jī)選擇
火災(zāi)危險(xiǎn)環(huán)境的電氣設(shè)備應(yīng)符合周圍環(huán)境內(nèi)化學(xué)的、機(jī)械的、熱的、霹菌及鳳沙等環(huán)境條件對(duì)電氣設(shè)備的要求。
在火災(zāi)危險(xiǎn)環(huán)境內(nèi)，應(yīng)根據(jù)區(qū)域等級(jí)和使用條件選擇電機(jī)的防護(hù)結(jié)構(gòu):
固定安裝式: 21區(qū)內(nèi):用IP44,但對(duì)有滑環(huán)等有火花部件的電機(jī)不宜采用;
22區(qū)內(nèi):用IP54;
23區(qū)內(nèi):用IP21， 但對(duì)有火花部件的電機(jī)應(yīng)采用IP44。
移動(dòng)攜帶式:都采用IP54。
(5)增安型防爆電機(jī)的應(yīng)用 增安型防爆電機(jī) YA型是Y系列電機(jī)的一個(gè)派生系列。其安裝尺寸與Y系列電機(jī)基本一致，并符合IEC(國(guó)際電工委員會(huì))和EN(歐洲標(biāo)準(zhǔn))的要求。主林外房護(hù)李級(jí)為1s54并增加了“輕微腐蝕”的防護(hù)，安裝維護(hù)方便，價(jià)格較低， 所以在石化行業(yè)、泵行業(yè)中得到了廣泛使用。 渣漿泵
Motor selection of slurry pump in explosive dust environment
Zone 10 is the dangerous area where explosive dust environment appears continuously or for a long time, and zone 11 is the dangerous area where explosive dust mixture may occur occasionally due to the raising of accumulated dust.
The electrical equipment and circuits in the explosive dust environment shall meet the requirements of different environmental conditions such as chemical, mechanical, thermal, mold and sand.
In explosive dust environment, the maximum allowable surface temperature of electrical equipment shall meet the requirements of table 5-17.
Selection of explosion-proof electrical equipment: in addition to the dust explosion-proof electrical equipment with dust-proof structure (marked as DP) in the 11 area environment of combustible non-conductive dust and conceivable fiber, the dust explosion-proof electrical equipment with dust-proof structure (marked as DT) shall be used in the 10 area of explosive dust environment and other 11 area of explosive dust environment, and the electrical equipment with different ignition temperature groups shall be selected according to the different ignition temperature of dust Equipment.
(4) motor selection in fire hazard environment
Electrical equipment in fire hazard environment shall meet the requirements of chemical, mechanical, thermal, thunderbolt and fengsha environmental conditions on electrical equipment in the surrounding environment.
In the fire hazard environment, the protection structure of the motor shall be selected according to the area level and service conditions:
Fixed installation type: IP44 is used in zone 21, but it is not suitable for motors with spark parts such as slip rings;
In zone 22: IP54;
Zone 23: IP21 is used, but IP44 is used for motors with spark parts.
Portable: IP54 is adopted.
(5) application of increased safety explosion-proof motor type Ya is a derivative series of Y series motor. Its installation dimensions are basically the same as those of Y-series motors, and meet the requirements of IEC (International Electrotechnical Commission) and en (European standard). The protection grade of main forest house is 1s54 and the protection of "slight corrosion" is added, which is convenient for installation and maintenance and low in price, so it is widely used in petrochemical industry and pump industry. Slurry pump
