一、過熱蒸汽的定義：
　　在飽和狀態(tài)下的液體稱為飽和液體，其對應(yīng)的蒸汽是飽和蒸汽，但最初只是濕飽和蒸汽，待蒸汽中的水分完全蒸發(fā)后才是干飽和蒸汽。蒸汽從不飽和到濕飽和再到干飽和的過程溫度是不增加的，干飽和之后繼續(xù)加熱則溫度會上升，成為過熱蒸汽。
二、過熱蒸汽常規(guī)應(yīng)用領(lǐng)域：
　　過熱蒸汽有其本身的應(yīng)用領(lǐng)域，如用在發(fā)電機組的透平，通過噴嘴至電機，推動電機轉(zhuǎn)動。但是過熱蒸汽很少用于工業(yè)制程的熱量傳遞過程，這是因為過熱蒸汽在冷凝釋放蒸發(fā)焓之前必須先冷卻到飽和溫度，很顯然，與飽和蒸汽的蒸發(fā)焓相比，過熱蒸汽冷卻到飽和溫度釋放的熱量是很小的，從而會降低工藝制程設(shè)備的性能。
三、過熱蒸汽密度表：

壓力	溫度（℃）
（MPa）	150	170	190	210	230	250	270	290	310	330
0.1	0.5164	0.4925	0.4707	0.4507	0.4323	0.4156	0.4001	0.3857	0.3724	0.36
0.15	0.7781	0.7412	0.7079	0.6777	0.65	0.6246	0.601	0.5795	0.5594	0.5404
0.2	1.0423	0.9918	0.9466	0.9056	0.8684	0.8342	0.8027	0.7736	0.7465	0.7214
0.25	1.3089	1.2444	1.1869	1.1349	1.0849	1.0445	1.0048	0.9682	0.9343	0.9027
0.3	1.5783	1.499	1.4287	1.3653	1.3079	1.254	1.2077	1.1634	1.1224	1.0844
0.4	2.1237	2.0141	1.9166	1.8297	1.7513	1.678	1.6152	1.5554	1.5	1.449
0.5	2.6658	2.538	2.4121	2.2997	2.1992	2.1081	2.0255	1.9495	1.8802	1.8147
0.8	4.3966	4.1676	3.935	3.74	3.5374	3.411	3.2718	3.1453	3.0283	2.9215
1.1	6.1313	5.8332	5.5342	5.2356	4.981	4.746	4.5445	4.3612	4.1943	4.041
1.4	7.8785	7.5163	7.154	6.7913	6.4288	6.1147	5.8437	5.5945	5.3794	5.177
1.7	9.8464	9.3688	9.2473	8.413	7.9352	7.5219	7.1803	6.8607	6.5815	6.3309
2	11.6295	11.0985	10.5676	10.0366	9.5054	8.9744	8.0535	8.1447	7.8061	7.4955
2.5	15.189	14.4516	13.715	12.9776	12.2406	11.0536	10.8794	10.35	9.8888	9.4806
3	18.4168	17.5709	16.7243	15.8776	15.0367	14.1842	13.3377	12.6359	11.9979	11.5143
3.5	22.7008	21.5713	20.4427	19.3131	18.2266	17.053	15.9243	15.0163	14.2565	13.8501
4	27.164	25.747	24.3303	22.9129	21.4954	20.0778	18.6603	17.4997	16.5527	15.749
4.5	30.3852	28.9163	27.4475	25.9784	24.5096	23.0407	21.5717	20.1028	18.9333	17.9308
5	35.4243	33.6293	31.8342	30.0384	28.2433	26.4483	24.6532	22.858	21.4221	20.2508
6	43.8954	41.7475	39.5988	37.4508	35.302	33.1541	31.0062	28.8574	26.7091	25.0502
7	56.7201	53.6991	50.678	47.6561	44.6352	41.6133	38.5922	35.5704	32.5488	30.2231
8	65.4713	62.18	58.8883	55.5968	52.3061	49.0145	45.7231	42.4316	39.1399	35.8485
9	84.5457	79.8261	75.1061	70.3863	65.6665	60.9465	56.21	51.5077	46.7877	42.068
10	108.625	102.0289	95.4346	88.8412	82.2486	75.6543	65.7699	62.4676	59.6648	49.2802
12.5	158.3464	148.7516	139.1587	129.5629	119.9781	110.3842	95.7769	91.1964	81.6043	72.0105
15	206.4175	194.4276	182.4477	170.4577	158.4766	146.4967	127.682	122.5268	110.5369	98.5531
17.5	250.3934	236.691	222.8603	209.1592	195.4568	181.6261	163.428	154.2312	140.3919	126.6895
20	327.8165	309.9521	291.2953	273.4409	255.5786	236.9271	219.0574	201.2031	182.5462	164.6839
21.5	384.6647	363.2975	341.9027	320.5455	299.188	277.7931	256.426	235.0688	213.6739	192.3164

專業(yè)提供：蒸汽減壓閥，自力式壓力調(diào)節(jié)閥，氣動三通調(diào)節(jié)閥，電動溫度調(diào)節(jié)閥，導(dǎo)熱油調(diào)節(jié)閥，氮封閥的計算、選型。