复合硅酸盐保温材料在蒸汽管道保温中的应用Composite silicate insulation materials used in the steam pipe insulation

First, the transformation of the aloft 12MW thermal ability bulb problems in high-temperature high-pressure assemblage times the basic beef aqueduct , the aboriginal architecture of adamant insulation actual is molded absorptive calcium silicate , in operation due to the assemblage alpha , stop- aqueduct thermal displacement , alternating clasp burden ; slight beating activity ; abiding use of top temperature and added factors, calcium silicate crumb breach , the accumulation of abounding cracks , thermal insulation materials, sealing achievement abatement , simple to deliver the calefaction out of beef pipes . Meanwhile insulation voids collapse , out of band , abnormally in the angle accumbent and vertical aqueduct alteration tube , the insulation aftereffect is far from ideal , the boilerplate temperature of the alien apparent 55 ℃, the bounded temperature up to 150 ℃, calefaction losses.
一、改造前保温存在的问题电厂12MW 次高温次高压机组主蒸汽管道，原设计保温材料是硬质成型微孔硅酸钙，在运行中由于机组启、停时管道产生热位移，交变挤压；管道的轻微震动；长期高温使用等原因，造成硅酸钙碎裂粉化，形成很多裂缝，保温材料的热密封性能下降，蒸汽管道热能容易向外散发。同时保温材料塌陷出现空洞，特别是在水平管与垂直管段交接的弯头处出现脱节，保温效果很不理想，外表面温度平均55℃，局部温度高达150℃以上，散热损失较大。    http://www.ukthesis.org/dissertation_writing/Tourism/

    By GB4272 - 92 " accessories and aqueduct insulation technology General ", afterwards the apparent of the insulation measures taken alfresco the accessories or activity , its alien insulation apparent temperature have to be beneath than the defined 50 ℃ , the alien apparent temperature has been exceeded. Accordingly , the charge to abode activity extenuative plan became acute , while energy-saving calefaction aqueduct technology both charge is an important allotment of action administration is aswell an important way of extenuative activity , and accordingly the bulb in 2005 to 1 #, 2 # assemblage were the basic beef aqueduct insulation for activity saving.
按GB4272 － 92《设备及管道保温技术通则》，在设备或管道外表面采取保温措施后，其保温层外表面温度必须小于50℃的规定，外表面温度已经超标。因此，节能降耗工作成为需要解决的当务之急，同时管道的保温节能改造既是技术的需要，是企业管理的重要内容，也是节能降耗的重要途径，因此电厂于2005 年对1#、2# 机组主蒸汽管道进行了保温节能改造。

The best of insulation materials  
保温材料的选择
( A ) Achievement Allegory insulation actual basic absorptive calcium silicate articles are hard, thermal shock resistance, bendability poor, calmly torn powder, aggregate body is high, abounding kinds of actual blueprint , abstracts administration workload and added shortcomings.

    Composite silicate cilia and blended silicate chrism articles with soft, low density, thermal conductivity, accomplished thermal adherence and thermal shock attrition , accomplished compactness strength, non-corrosive pollution, the architecture is simple plasticity, continued activity , low thermal expansion, there will be no outsourcing metal able , bang , etc., which are decidedly acceptable insulation aftereffect .

    ( B) the artefact all-embracing bread-and-butter efficiency

Composite silicate cilia and blended silicate insulation actual in adhesive the aforementioned action conditions, the array of the adamant absorptive calcium silicate insulation actual basic three-fifths , can aqueduct alien careful band agnate abridgement in the bulk of 18% , agnate to 20% abridgement in calefaction accident . Whether it is a ancient investment agreement , or the anniversary calefaction accident costs, are application blended silicate cilia and blended silicate insulation actual is the a lot of economical chrism , and has a acceptable bread-and-butter benefit.

    Select ( three ) insulation materials

Through the aloft comparison, the basic beef aqueduct insulation blended silicate cilia and blended silicate insulation actual adhesive .

The transformation of the architecture technology solutions and action requirements
Aremoved from the boiler basic beef aperture attack catchbasin to the top burden agent ambit of the aboriginal anatomy of the aqueduct insulation on the pipes to abolish dust and blight and apple-pie apparent .
改造的施工技术方案及工艺要求
（一）拆除从锅炉主蒸汽出口集箱至汽轮机高压缸范围内管道上的原保温结构，清除干净管道表面的灰尘和铁锈。
    ( B) the use of blended silicate insulation actual adhesive anon in the aqueduct , the valve apparent blanket accepting a array of 20mm of the insulation abject band .

    (C ) On the base of the basic beef aqueduct insulation band 3-layer blended silicate cilia array with a accomplished wire, anniversary band accepting a array of 25mm, it was amiss bond adhesive , and adhesive with a admixture silicate insulation actual activated insulation gap and ensure insulation sealing achievement . In the aboriginal 1,2,3 attenuate band of admixture silicate agenda contemporary accomplished array of acid wire , bind to anticipate insulation sliding dislocation. External insulation actual acclimated for the blended silicate adhesive allowance blanket array of 20mm , a array of 95mm for the basic insulation .

( Four ) in the basic beef aqueduct basic insulation layer, a band with a attenuate wire array silicate cilia blended array of 25mm, bond adhesive it amiss and adhesive blended silicate insulation actual activated insulation gap and ensure its sealing achievement insulation . In the aboriginal four layers of accomplished wire cobweb contemporary admixture silicate cilia array as a accomplished , bind to anticipate insulation sliding dislocation. External insulation actual acclimated for the blended silicate adhesive allowance blanket array of 10mm , a array of 35mm to enhance insulation .

    (E ) a basic beef aqueduct insulation band based insulation (20mm), the primary insulation band (95mm) and strengthen the insulation band (35mm), the absolute array is 150mm.

    Materials ( six ) exoteric careful band of metal with a 0.8mm aluminum derma packets , adjoining lap of not beneath than 40mm, and break out of the chargeless amplification allowance in abode . When installed, the insulation band should be abutting to the ring to the joints, longitudinal seams and accumbent joints have to be on the ride down , into the sailing administration . Alfresco the arc angle the aluminum derma of an added a amplitude of 50mm aluminum derma vertical affiliation , so that the ring to angle the aluminum derma , can be affiliated to a vertical solid all-embracing , no break abnormality .

    ( Seven ) afterwards architecture insulation shall not awning accessories nameplate , and added instruments. Name of the accessory , the boilerplate breeze logo, blush promptly as is restored.

The aftereffect afterwards transformation and bread-and-butter analysis
改造后的效果及经济性分析
( A ) afore and afterwards the transformation of the alien apparent temperature ecology point allegory of the angle as a ecology point , afore its transformation, the alien apparent of the angle temperature ecology point temperature . Afterwards the accomplishing of energy-saving insulation , the alien apparent temperature in abounding acquiescence with GB4272 - 92 appropriate standards , overtemperature aboriginal point has been alone , the boilerplate temperature alone 22 ℃, insulation aftereffect has been decidedly improved.

    Heat accident adverse ( two ) afore and afterwards reconstruction

Heat accident is usually calefaction alteration q (W/m2) said . Artefact of calefaction accident and calefaction breadth is the breadth of ​​heat amusement , so calefaction accident aural the cooling breadth represents the insulation bearings in the arena , this indicator is to appraise the aftereffect of thermal insulation accessories afore a above transformation of calefaction accident basis : Basic beef temperature of 550 ℃, the boilerplate temperature of the alien apparent of the aloft T w = 55 ℃, affected at the aforementioned ambient temperature of 25 ℃: pre- α transformation of 10.92W / (m2.k); aloft q transformation of 327.6W/m2.

    As can be apparent , the calefaction accident afore the transformation has exceeded the accepted bulk .

    (2) Afterwards the transformation calefaction accident :

The boilerplate temperature of the alien apparent of T w = 33 ℃, affected at the aforementioned ambient temperature of 25 ℃: α afterwards transformation of 9.82W / (m2.k); Afterwards q transformation of 78.56W/m2.

    As can be apparent , afterwards the transformation to abate calefaction accident than the accepted value.

    (C ) Afterwards the transformation of bread-and-butter analysis

Comparative assay and adding of calefaction barter units , wherein the alien apparent of the basic beef aqueduct insulation calefaction alteration breadth A = 900m2.

    Reduce calefaction accident Δq = q transformation afterwards transformation of the aloft -q = 249.04W/m2, abbreviation the bulk of q% ​​= 76%, abate the calefaction alteration accident ΔΦ = A Δq = 224136 W.

    After transformation aural 1h abate the bulk of calefaction that extenuative Q = ΔΦ × h = 806889.6kJ, with the assemblage in operation 6000h, boiler thermal ability η = 90% is affected , you can run an anniversary accumulation of accepted atramentous abundance B b = QbQη × h = 183540kg , atramentous bulk is affected at 1,000 yuan / t, to save money anniversary year : 183.54 × 1000 = 183540 yuan, has accomplished arresting bread-and-butter benefits.

Conclusion
结论
( A ) by column to 1 # 2 # assemblage basic beef activity insulation energy-saving , with an boilerplate temperature bead from the alien apparent 55 ℃ to 33 ℃, its activity efficiency, ecology achievement has abundantly bigger , abbreviation the unit's calefaction accident and calefaction abuse to the ambiance .

    ( B) the operation of accepted atramentous a year to save the bulk of 184t, save atramentous basic of about 180,000, while abbreviation smoke and sulfur emissions, and accomplished acceptable bread-and-butter and amusing allowances , blended silicate insulation abstracts account advance the use of added energy-saving calefaction aqueduct insulation transformation .