JB/T 6470.1-1992 Technical conditions for steam turbine water jet air extractor JB/T6470.1-1992 Standard download and decompression password: www.bzxz.net

K54
JB
Pressing Machinery Ring Industry Standard of the People's Republic of China JB/T6470.11992
1992-08-064
e
14||tt ||1993-01-01
G R2 0P xpEe/
JB/T6470.1±1992
This standard specifies the structural type, design parameters, Performance indicators, inspection and delivery technical requirements. This standard applies to water jet air extractors matched with steam turbine condensers. Under similar conditions, it is also suitable for other water jet air extractors. 2 Reference standards
ZB K54 013
JB3596
JB2900
JB2901
ZBK54005
JB/Z164
JB/ Z163
ZBK54017
ZBK54058
GB/T13306
GB3274
GB4237
GB1176
GB1348
GB2270 | | tt | | GB8163 | | tt | | GB3077 | | tt |
Steam turbine paint technical conditions
Steam turbine rust prevention technical conditions
Steam turbine cast iron technical conditions
General process regulations for steam turbine rust prevention
Typical process of steam turbine painting| |tt||Steam turbine auxiliary equipment model preparation method
Steam turbine cleanliness standards
Product labels
Carbon structural steel and low alloy structural steel hot-rolled thick steel plates and steel strips stainless steel hot Rolled steel plate
Cast iron copper alloy
Nodular iron castings
Stainless steel seamless steel pipe
Seamless steel pipe for conveying fluids
Alloy structural steel technical conditions|| tt||Carbon steel and low alloy steel plate for boilers
Stainless casting
Name, type and terminology
3
3.1 Name
Water jet pump The names of the various components of the gas apparatus are shown in Figure 1. 1992-08-06rat
1993-01-01
1
3.2 Structural type
JB/T6470.1 ±1992
D or 610
Supplement
Water
Figure 1 Schematic diagram of water jet air extractor system
2——Nozzle;||tt| |1—water chamber,
5—shrink tube; 6—throat;
9—water tank,
0
water
4 —Steam and gas mixture inlet pipe,
3 — Entry chamber,
7 — Auxiliary pipe: 8 — Water jet pump;
H — Layout elevation.
3.2.1 The water jet air extractor model is compiled according to the regulations of ZBK54017. 3.2.2 The classification of water jet air extractors is detailed in Figure 2. 2
Single nozzle short throat
d) Single nozzle long throat with diffusion section
3.3 Terminology| |tt||JB/T 6470.11992
b) Multi-nozzle short throat
e) Multi-nozzle single-channel long throat
Figure 2 Various types of water injection and air extraction Device
Medium
c) Single nozzle and long throat
f) Multiple nozzles and multi-channel long throat
3.3.1 Water jet air extractor||tt ||A fluid conveying machine that uses a high-speed jet of pressurized water to suck non-condensable gas (or gas-gas mixture) in the condenser. 3.3.2 Long-throat water jet aspirator
A water jet aspirator in which the ratio of the length of the embedded tube to the cross-sectional diameter of the tube is not less than 18. 3.3.3 Short throat water jet air aspirator
A water jet air aspirator with a ratio of throat length to throat cross-section diameter of 2 to 5. 3.3.4 Single-channel water jet air extractor
Single-tube water jet air extractor.
3.3.5 Multi-channel water jet air aspirator
JB/T6470.11992
A water jet air aspirator with two or more throats. 3.3.6 Air extractor capacity
Under design working conditions, the mass of air sucked by the air extractor per unit time. 3.3.7 Working water pressure
The absolute static pressure in front of the nozzle in the water chamber of the water aerator. 3.3.8 Working water temperature
The temperature of the water at the entrance of the water chamber of the water jet air extractor. 3.3.9 Suction pressure
The absolute static pressure at D1 or 610mm in front of the steam and gas mixture inlet pipe flange. 3.3.10 Suction temperature
The temperature of the sucked steam and gas mixture at the suction inlet. 3.3.11 Drainage pressure
The absolute static pressure 100mm below the outlet flange of the water jet air extractor. 3.3.12 Unit power consumption (specific power consumption) is the electrical power consumed per hour to pump dry grams of dry air. 3.3.13 Arrange the distance between the outlet flange surface of the water jet air extractor and the water surface of the pool. 3.3.14 Area ratio
The ratio of the cross-sectional area of ??the throat to the cross-sectional area of ??the nozzle outlet. 4 Technical requirements
4.1
Design parameter selection
4.1.1 Working water temperature
The working water temperature depends on the regional meteorology, hydrology and water supply. General recommendations: 15, 20, 25C or user requirements. 4.1.2 Working water pressure
Long throat water injection air suction device generally takes 0.18~0.40MPa (a) Short throat water injection air suction device generally takes 0.30~0.60MPa (a) 4.1.3 Suction pressure|| tt||The design suction pressure is (0.925~0.97) times the condenser design pressure. 4.1.4 Suction temperature
The temperature of the sucked steam and gas mixture should be the saturated steam temperature under the pressure of the suction chamber minus the higher of the following two temperature values: saturated steam temperature and circulating water inlet design 25% of the temperature difference. 8.
b.4.2℃.
4.1.5 Layout elevation
The layout elevation of long throat water jet air extractor: 0～1.5m; short throat water jet air pump The layout elevation: 2~6m. 4.2 Selection of exhauster capacity
4.2.1 The ratio of the amount of non-condensable gas extracted from the vacuum system to the design capacity of the exhaust device, or the amount of non-condensable gas should comply with the requirements in Table 1. 4
Aspirator capacity
Q
Standard m/min12
0.566
0.566Q≤1.132
>1.132||tt ||JB/T 6470.11992
Table
1
Condensate water oxygen content
L.
μg/L
42
14
7
42
14
7
42
14
7
Amount of non-condensable gas extracted
Aspirator capacity
%
50
35
25
50
25
15
Note: 1) Standard m/min refers to the pressure of 0.1013MPa (a) and the temperature For the case of 21℃. Non-condensable gas volume
standard m2/min1)
≤0.566
0.283
0.170
4.2.2 The capacity of the air extractor should not be less than Table 2 , the specified values ??in Table 3 and Table 4, the selection method is selected in Table 2, Table 3 and Table 4 respectively according to the number of condenser shells, the total number of exhaust ports and the effective amount of steam on each exhaust day. The total number of exhaust ports and the effective steam flow rate of each exhaust port are determined as follows: the total exhaust steam volume is the sum of the exhaust steam volume of the main turbine and the steam volume of the auxiliary steam turbine entering the condenser. 4. 2. 2. 1
The number of main exhaust ports refers to the number of exhaust ports of the main turbine, but does not include the number of exhaust ports of the auxiliary turbine. 4.2.2. 2
4. 2. 2. 3
4. 2. 2.4
number.
The effective steam flow rate of each exhaust port is the total exhaust steam volume divided by the number of main exhaust ports. If there is an auxiliary turbine exhausting steam to the main condenser, the total number of exhaust ports is equal to the number of main exhaust ports plus the capacity of the auxiliary turbine exhaust port extractor (single shell condenser)
Table 2
Total
Effective steam flow rate for each raw and exhaust port
kg/h
~11340
11341~22680
2268145360
45361~-113400
113401~226800
226801-453600
453601~907200
907201~1360800
1360801~1814400| |tt||1
0.085
0.113
0.142
0.212
0.283
0.354
0.425||tt ||0.496
0.566
2
0.113
0.142
0.212
0.354
0.425
0.566
0.708
0.708
0.850
3
draw
0.142
0.212
0.283| |tt||0.354
0.496
0.566
0.708
0.850
0.991
4
row||tt ||Grade
Steam
5
Mixed
Combined
Oral
Object
Standard m\/min1| |tt||0.142
0.212
0.283
0.425
0.566
0.708
0.850
0.991||tt ||1.133
0.212
0.283
0.354
0.496
0.708
0.850
0.991
1.133
1.274
The standard m*/min value refers to the case where the pressure is 0.1013MPa (a) and the temperature is 21°C. Note: 1>
number
8
amount
0.212
0.283
0.354
0.566||tt| |0.708
0.850
1.133
1.274
1.416
0.212
0.283
0.425
0.566
0.850
0.991
1.133
1.416
1.558
0.283
0.354
0.425|| tt||0.708
0.850
1.133
1.274
1.558
1.699
0.283
0.354||tt| |0.425
0.708
0.991
1.133
1.416
1.699
1.841
2) Only the data in the table are considered Air leakage and the amount of steam and air mixture are determined when the suction pressure is 3.386kPa (a) and the temperature is 22°C. Effective steam flow rate for each main exhaust port
kg/h
45361~113400
113401~226800
226801453600
453601907200||tt| |9072011360800
1360801~1814400
Note: 1)
Table 3
JB/T6470.1±1992
Aspirator capacity (double shell Body condenser)
Total
5
Pumping
Discharge
Suction
Steam
8||tt ||Mixed
Combined
Oral
Object
Standard m\/min
0.4250.5660.5660.5660.7080.7080.8500.8500.5660.5660.7080.8500.8500. 9911.133 | ||133
.416
number
10
amount
11
12
13||tt| |14
0.9911.1331.1331.133
0.991
1.4161.6991.699
.416
1.416
1.9821.982||tt ||1.6991.6991.982
1.6991.9821.982
2.266
2.2662.549
0.9911.1331.1331.4161.6991.6991.9822.2662.266
5 2.5492.8322.832| | tt | When the temperature is 21°C, 2.5492.8322.832
3.1153.398
2) The data in the table only considers air leakage, and the amount of steam and gas mixture is when the inhalation force is 3.386kPa (a) , determined at a temperature of 22°C, Table 4
Air extractor capacity 2
Effective steam flow rate of each main exhaust port
kg/h
113401~226800
226801~453600
453601907200
907201~1360800
13608011814400
3
5
(three Shell condenser)
Total
Pumping
Discharge
jun
8
Steam
Mixed|| tt||口
standard m/minu
0.8500.8501.0621.062
1.062
0.850
1.062
1.274||tt ||1.487
1.0621.274
1.2741.487
1.4871.699
.274
487
487||tt| |699
Number
o
Quantity
11
12
13
14
1.2741 .4871.4871.6991.6992.1242.1241.6992.1242.124
2.124
487
2.549
2.549
2.1242.1242.1242.549 | 2.1242.1242.549
Note, 1) Standard m /min value refers to the case where the pressure is 0.1013MPa (a) and the temperature is 21c. 2) The data in the table only considers air leakage, and the amount of steam and air mixture is determined under the conditions of suction pressure of 3.386kPa(a) and temperature of 22°C. 4.2.4 The conversion of air extractor capacity is specified in Table 5. 4.3 Specific power consumption
The specific power consumption of long throat water injection air extractor is generally 1~1.4kW/(kg/h), not more than 1.4kW/ (kg/h), the specific power consumption of the short throat jet air extractor is generally 2~4kw/(kg/h), not more than 4kW/(kg/h). Table 5 Aspirator capacity conversion (dry air volume, water vapor volume and steam and gas mixture volume) suction mixture volume
standard m*/min\
dry air volume kg/h|| tt||Amount of water vapor kg/h
Amount of steam and gas mixture
kg/h
Amount of suction mixture
Standard m*/min1)||tt ||Dry air volume kg/h
Water vapor volume kg/h
Steam and gas mixture volume kg/h
6
0.085
6.12
13.47
19.59
0.850
61.24
134.72
195.96
0.113
8.16|| tt||17.96
26.12
0.991
71.44
157.17
228.61
0.142
10.21||tt| |22.45
32.66
1.062
76.57
168.47
245.04
0.212
15.33
33.75
49.08
1.133
81.65
179.63
261.28
0.283
20.41
44.91|| tt||65.32
1.274
91.85
202.08
293.93
0.354
25.49
56.06||tt| |81.55
1.416
102.06
224.53
326.59
Q.425
30.62
67.36||tt| |97.98
1.487
107.19
235.83
343.02
0.496
35.70
78.52
114.22
1.558
112.27
246.99
359.26
0.566
40.82
89.81
130.63|| tt||1.699
122.47
269.44
391.91
0.708
51.03
112.27
163.30||tt| |1.841
132.68
291.89
424.57
Pumped mixture volume
Standard m/min\
Dry air volume kg/h
Amount of water vapor kg/h
Amount of steam and gas mixture kg/h
1.982
142.88
314.34
457.22|| tt||2.124
153.09
336.80
489.89
JB/T6470.11992
Continued Table 5
2.266||tt| |163.30
359.25
522.55
2.549
183.71
404.16
587.87
2.832
204.12
449.06
653.18
2.974
214.33
471.52
685.85
Note, 1) Standard m3/min value It refers to the case where the pressure is 0.1013MPa (a) and the temperature is 21°C. Noise
4.4
3.115
224.53
493.97
718.50
3.398
244.94
538.88| |tt||783.82
3.823
275.56
606.24
881.80
The maximum value measured at the location does not exceed 90dB (A sound pressure level). Optimized design
4.5
The working water pressure and area ratio must be determined by optimized design. 4.6 Selection of materialsbZxz.net
4.6.1 The materials used for the water jet air extractor must comply with the design drawings, and their technical requirements, quality, and specifications should comply with the relevant provisions of national standards and industry standards.
4.6.2 The shrink tube should be made of cavitation-resistant material. The nozzle should be made of wear-resistant material. 4.6.3
4.6.4 When seawater is used as the working medium, the materials of the entire water injection and pumping components should be selected to resist seawater corrosion. 4.6.5 The materials of the various components of the water jet vacuum pump can be selected according to Table 6. Table 6
Parts name
Water chamber shell
Suction chamber bright body
Nozzle
Material name
Carbon steel plate
Stainless steel plate
Cast iron
Stainless steel plate
Cast copper
Q235---A
Material grade
Q235—AF
1Cr13
1Cr18Nig| |tt||oCr18NigTi
oCr19Nig
0Cr19Ni13Mo3
(1Cr18Ni9Ti)
(1Cr18Ni12Mo3Ti)
HT200
HT250
1Cr13
1C118Ni9
OCr18Ni9Ti
oCr19N i9
(Cr19Ni13Mo3
(1Cr18Ni9Ti)
(1Cr18Ni12Mo3Ti)
ZCuSn5Pb5Zn5
ZCuAl9Mn2
Standard No.
GB3274
GB4237
ZBK54005
GB4237
GB 1176
Remarks
Parts name
Contract tube
Throat
Expander tube
Expander tube
Flange
Bolt
Material name
Cast steel
Stainless steel plate
Stainless steel cast steel
Cast iron
Seamless steel pipe
Stainless steel pipe
Carbon steel plate||tt| |Stainless steel plate
Stainless steel plate
Cast iron
Magnetic steel
Cast iron
Stainless steel plate
Carbon steel
Alloy structural steel
Note: The materials in brackets are not recommended
5 Inspection
JB/T6470.11992
Continued Table 6
Material brand
2CuSn5Pb5Zn5
Z CuAl9Mn2
1Cr18Ni9
OCr18Ni9Ti
OCr19Nig
0Cr19Ni13Mo3
(1Cr18Ni9Ti)
(1Cr18Ni12Mo3Ti)
ZG2Cr13
HT200
HT250
20
ICr 18NigTi
Q235—A
20g
1Cr13
1Cr18Nig
OCr18Ni9Ti
oCr19Ni9
OCr19Ni13Mo3
(1Cr18Ni9Ti)
(1Cr18Ni12Mo3Ti)
HT200
HT2 50
Q235—A
Q235--A·F
HT200
HT250
OCr19Ni13Mo3
(1Cr18Ni12Mo3Ti)
Q235-A
3545
35CrMo
The pressure of the water pressure test is 1.5 times the design pressure. The pressure shall be maintained for 10 minutes and no leakage shall be allowed. 5.1
Standard No.
GB1176
GB4237
GB2100
ZBK54005
GB8163
GB2270
GB3274
GB713
GB4237
GB4237
ZBK54005
GB3274
ZBK54005
GB4237
GB3274
GB699
GB3077
Note
5.2 The first water jetting vacuum pump of each specification must be subjected to performance test according to JB3596, and the result shall meet the requirements of air extraction under design working conditions.
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