热动091孙志禹0902050127作业四.doc

第四次作业 低真空供热与抽气供热的节能分析一、计算条件（1）、供暖建筑面积：400104（2）、供暖热指标：500W/m2（3）、额定热负荷：（4）、气温持续时间（表一）：气温 t（）-24-20-10035持续时间 h （h）12040010001200800200（5）采用凝汽机组抽气供热：二、抽气供热标准煤耗量（1）、汽轮机耗汽量D0 （2）、供热汽Dh （3）、供热量Q（MW） （4）、汽机排汽量Dc =（5）、锅炉产汽量Db （6）、汽水损失Ds （7）、排污量Dpw （8）、排污二次汽、水量 （9）、给水量Dfw （10）、高压加热器1汽量D1 （11）、高压加热器2汽量D2 （12）、高压加热器3汽量D3 （13）、4段抽汽量D3 （14）、除氧器用汽量Dcy （15）、汽动给水泵汽量Dpu 抽气供热标准煤耗量B： 抽气供热发电功率N（MW）：抽气供热计算表格:（表二）序 号项 目 符 号单 位结 果1抽汽供热标准煤耗量Bt/h81.57476.5713964.0643851.5573747.8052545.30382抽汽供热发电功率NkW155.124147.2453127.5485107.8518101.942798.00333抽汽供热总煤耗量Bzt213655.62784额定热负荷QeMW2002002002002002005供热量QMW200180.9524133.333385.7142971.4285761.90486气温 t-24-20-100357持续时间 hh120400100012008002008汽轮机耗汽量D0t/h707.829664.4193555.8944447.3695414.8119393.1079供热汽量Dht/h281.818254.9782187.8787120.7791100.649387.229410汽轮机排汽量Dct/h15015015015015015011锅炉产汽量Dbt/h711.368667.7414558.6739449.6063416.8859395.07212汽水损失Dst/h3.539143.3220972.7794722.2368472.0740591.9655313排污量Dpwt/h0.707830.6644190.5558940.4473690.4148120.3931114排污二次水量Dpwst/h0.501120.4703850.3935530.3167210.2936720.2783115排污二次汽量Dpwqt/h0.206710.1940340.1623410.1306480.121140.114816给水量Dfwt/h712.076668.4059559.2297450.0537417.3008395.46517高压加热器1汽量D1t/h47.717844.7913537.4752230.1590927.9642426.50118高压加热器2汽量D2t/h56.662153.1871244.4996435.8121633.2059131.468419高压加热器3汽量D3t/h42.132939.5489933.0891326.6292824.6913223.3993204段回热抽汽量D4t/h129.498121.9134102.951483.9894978.3008974.508521除氧器耗汽量Dcyt/h101.6195.7360181.0498266.3636361.9577759.020522汽动给水泵汽量Dput/h27.887626.1773121.9015617.6258116.3430815.487923再热汽量Drht/h603.449566.4405473.9192381.3979353.6415335.13724汽轮机进汽焓h0KJ/Kg3394.453394.453394.453394.453394.453394.4525给水焓hfwKJ/Kg736.71736.71736.71736.71736.71736.7126再热器入口焓hrhKJ/Kg3044.183044.183044.183044.183044.183044.1827再热器出口焓hrhKJ/Kg3534.73534.73534.73534.73534.73534.728高加1出口焓hw1KJ/Kg1193.661193.661193.661193.661193.661193.6629高加2出口焓hw2KJ/Kg1058.81058.81058.81058.81058.81058.830高加3出口焓hw3KJ/Kg879.98879.98879.98879.98879.98879.9831除氧器出口焓hw4KJ/Kg707.65707.65707.65707.65707.65707.6532高压加热器1汽焓h1KJ/Kg3148.63148.63148.63148.63148.63148.633高压加热器2汽焓h2KJ/Kg3044.183044.183044.183044.183044.183044.1834高压加热器3汽焓h3KJ/Kg3365.33365.33365.33365.33365.33365.3354段回热抽汽焓h4KJ/Kg31313131313131313131313136加热器1疏水焓hs1KJ/Kg1095.061095.061095.061095.061095.061095.0637加热器2疏水焓hs2KJ/Kg908.33908.33908.33908.33908.33908.3338加热器3疏水焓hs3KJ/Kg760.24760.24760.24760.24760.24760.2439排污焓hpwKJ/Kg11001100110011001100110040排污二次汽焓hpwqKJ/Kg27002700270027002700270041排污二次水焓hpwsKJ/Kg44044044044044044042供热回水焓hhjKJ/Kg524.02524.02524.02524.02524.02524.0243回水疏水焓hsh2KJ/Kg208.59208.59208.59208.59208.59208.5944凝结水焓hcKJ/Kg97.0297.0297.0297.0297.0297.0245凝汽器入口焓hcKJ/Kg2471.62471.62471.62471.62471.62471.646给水泵出口压力PfwMPa22.322.322.322.322.322.3474段回热抽气压力P4MPa0.78810.78810.78810.78810.78810.788148再热焓升qKJ/Kg490.52490.52490.52490.52490.52490.5249加热器效率j0.980.980.980.980.980.9850锅炉产热效率b0.920.920.920.920.920.9251管道效率p0.990.990.990.990.990.9952泵效率pu0.850.850.850.850.850.8553机械效率m0.980.980.980.980.980.9854发电机效率g0.990.990.990.990.990.99三、低真空供热计算：（1）、各时间点数据：（表三）气温 t（）-24-20-10035持续时间 h （h）12040010001200800200供热水温tw2（）908478726660供热回水温度tw1（）504642383430（2）、汽轮机排汽最高允许温度68（3）、汽轮机排汽温度tc （4）、凝汽器冷却水温升t （5）、凝汽器端差t 其中：A=8000m2供热面积K=3.7KW/(m2)传热系数C=4.8168KJ/Kg水比热Dw（Kg/s）凝汽器冷却水量（6）、连接原则（7）、凝汽器冷却水量（供热水量）Dw （21）（8）、判断 （22） （23）（9）、汽轮机排汽压力、焓 （24） （25）（10）、汽轮机排汽量Dc （26）（11）、热网加热器用汽量Dhj （27） （28）低真空供热计算表格：（表四）序 号项 目 符 号单 位结 果1低真空供热标准煤耗量Bt/h112.13101.4574.75548.05740.0734.7892低真空供热发电功率NkW236.83214.28157.89101.584.77173.9673低真空供热总煤耗量Bzt225474.71944额定热负荷QeMW2002002002002002005凝汽器供热量(估算）QMW200180.95133.3385.71471.42961.9056凝汽器供热量(取用）QMW89.758104.5596.26475.6371.42961.9057热网加热器供热量QhMW110.2476.437.0710.08571.42961.9058总供热量QzMW200180.95133.3385.71471.42961.9059气温 t-24-20-1003510汽轮机排汽温度(估算）tc90.10884.07678.01272666011汽轮机排汽温度(取用）tc68686868666012供热水温tw290847872666013供热回水温度tw150464238343014凝汽器冷却水温升（理论计算）t40383634323015凝汽器冷却水温升（实际）t17.95221.95625.99130323016凝汽器端差t0.10770.0760.01220.00036E-052E-0517凝汽器供热出口水温(理论计算）tw190847872666018凝汽器供热出口水温（实际）tw167.95267.95667.99168666019持续时间 hh1204001000120080020020汽轮机耗汽量D0t/h972.99880.32648.66417347.69301.8721供热汽量Dht/h281.82254.98187.88120.78100.6587.22922汽轮机排汽量Dct/h310.98281.37207.32133.28111.2596.9123锅炉产汽量Dbt/h977.85884.73651.9419.08349.43303.3824汽水损失Dst/h4.86494.40163.24332.0851.73851.509325排污量Dpwt/h0.9730.88030.64870.4170.34770.301926排污二次水量Dpwst/h0.68880.62320.45920.29520.24620.213727排污二次汽量Dpwqt/h0.28410.25710.18940.12180.10150.088228给水量Dfwt/h978.83885.61652.55419.5349.78303.6829高压加热器1汽量D1t/h65.59359.34643.72928.11123.4420.3530高压加热器2汽量D2t/h77.88870.4751.92633.38127.83324.16531高压加热器3汽量D3t/h57.91652.40138.61124.82120.69617.968324段回热抽汽量D4t/h178.79161.76119.1976.62463.82455.24533除氧器耗汽量Dcyt/h143.62129.9495.74761.55251.32444.56534汽动给水泵汽量Dput/h35.16931.8223.44615.07312.510.67935再热汽量Drht/h829.51750.51553.01355.5296.42257.3536凝汽器冷却水量Dwt/h4299.24094.53184.62167.71919.31774.337热网加热器用汽量Dhjt/h152.23105.551.1913.9260038汽轮机进汽焓h0KJ/Kg3394.53394.53394.53394.53394.53394.539给水焓hfwKJ/Kg736.71736.71736.71736.71736.71736.7140再热器入口焓hrhKJ/Kg3044.23044.23044.23044.23044.23044.241再热器出口焓hrhKJ/Kg3534.73534.73534.73534.73534.73534.742高加1出口焓hw1KJ/Kg1193.71193.71193.71193.71193.71193.743高加2出口焓hw2KJ/Kg1058.81058.81058.81058.81058.81058.844高加3出口焓hw3KJ/Kg879.98879.98879.98879.98879.98879.9845除氧器出口焓hw4KJ/Kg707.65707.65707.65707.65707.65707.6546高压加热器1汽焓h1KJ/Kg3148.63148.63148.63148.63148.63148.647高压加热器2汽焓h2KJ/Kg3044.23044.23044.23044.23044.23044.248高压加热器3汽焓h3KJ/Kg3365.33365.33365.33365.33365.33365.3494段回热抽汽焓h4KJ/Kg31313131313131313131313150加热器1疏水焓hs1KJ/Kg1095.11095.11095.11095.11095.11095.151加热器2疏水焓hs2KJ/Kg908.33908.33908.33908.33908.33908.3352加热器3疏水焓hs3KJ/Kg760.24760.24760.24760.24760.24760.2453排污焓hpwKJ/Kg11001100110011001100110054排污二次汽焓hpwqKJ/Kg27002700270027002700270055排污二次水焓hpwsKJ/Kg44044044044044044056供热回水焓hhjKJ/Kg524.0252