JB/T 5904.1-1999 Technical requirements for low pressure turbo expanders
Some standard content:
ICS 71.100.20
J76
JB
Machinery Industry Standard of the People's Republic of China
JB/T5904.1-1999
Low-pressure turbine expander| | tt | ||JB/T5904.1-1999
Foreword
This standard is a revision of ZBJ76033-90 "Technical Conditions for Low-Pressure Turbine Expanders". Compared with ZBJ76033-90, the main technical content of this standard has changed as follows: In 4.2, it is added that product testing can be conducted at the manufacturer or user site. It is added in 5.3.1 that type inspection should be carried out when required by the contract. It is added in 6.2.3 that all markings should comply with the relevant provisions of GB191. This standard replaces ZBJ76033-90 from the date of implementation. Appendix A and Appendix B of this standard are appendices to the standard. This standard is proposed and coordinated by the Gas Separation and Liquefaction Equipment Standardization Technical Committee. This standard was drafted by: Hangzhou Oxygen Concentrator Group Co., Ltd. The main drafters of this standard: Cai Guocheng and Shi Jianzhong. This standard was first published in October 1990. 1
Scope
People's Republic of China Machinery Industry Standards
Technical Conditions for Low Pressure Turboexpanders
Specifications for lowpressureturboexpandersJB/T5904.1-1999
Replaces ZBJ76033 —90wwW.bzxz.Net
This standard specifies the technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of low-pressure turbine expanders. This standard is applicable to centripetal turbine expanders (hereinafter referred to as expanders) whose working fluid is used to obtain cooling capacity during the air separation and liquefaction process, and the inlet pressure is not greater than 1.6MPa (absolute pressure). This standard is not applicable to Steam and liquid two-phase expander. 2 Referenced standards
The provisions contained in the following standards constitute provisions of this standard by being quoted in this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision and parties using this standard should explore the possibility of using the latest version of the standard listed below. GB1911990
GB/T 26241993
GB/T2888—1991
GB/T13306—1991
GB/T13384—1992
JB/T5904.2 —1999
Packaging, storage and transportation pictorial mark
Flow measurement throttling device uses orifice plate, nozzle and venturi tube to measure the fluid flow rate filled with circular tubes Fan and Roots blower noise measurement method signboard|| tt||General technical conditions for mechanical and electrical product packaging
Technical requirements for manufacturing low-pressure turbine expanders
"Pressure Vessel Safety Technical Supervision Regulations" 3 Technical Requirements
3.1 The expander shall comply with this standard According to the regulations, product manufacturing should refer to the requirements of JB/T5904.2 and be manufactured in accordance with the drawings and technical documents approved by the prescribed procedures.
3.2 The medium entering the expander should be dry, clean, non-corrosive gas. 3.3 The energy expansion machine manufacturer should determine the design flow rate and allowable working range of the product and variant products. The flow deviation under the design working conditions, the upper deviation is 10% of the design working conditions, and the lower deviation is -5% of the design working conditions. 3.4 The equal extraction efficiency
The equal extraction efficiency value of the expander must meet the supporting requirements of the complete set of equipment, and the equal extraction efficiency value of its design working condition shall not be lower than that specified in Figure 1.
The conversion of the standard flow rate under the design working condition of the expander and the standard flow rate under the reference state can be carried out by referring to the principle of equal dimensionless flow rates. That is: 9-(/pXZRT/ZR7
(po/poXk/ko)
G
where: g Standard flow rate of the expander in the reference state (0℃, 101.325kPa) , m/h: Approved by the National Machinery Industry Bureau on 1999-07-12 ()
Implemented on 2000-01-01
-
JB/T 5904.1-1999
p - T. Density of the medium (0℃, 101.325kPa), kg/m; p - Density of air (0℃, 101.325kPa), kg/m; Z - Compressibility coefficient of the working medium under the design working condition : Z—air compressibility coefficient in the base state; R—gas constant of T as medium, Nm/(kgK); R—gas constant of air, Nm/(kgK); T—design working conditions of the expander The inlet temperature of the expander, K; T - the inlet temperature of the expander's base state, K; Po's inlet pressure of the expander's design working condition, MPa; P's inlet pressure of the expander's base state, Mpa; - the isotropic index of the working medium; | | tt | 80
70
60
10#
2 × 10* 3 × 10' 5× t0 8 × 10 10n, the equal-end efficiency of Yiying expander, %;
Basic state:
Quality: air
Inlet pressure: 0.6MPs
Outlet pressure: 0.15MP
Import yield: 130K|| tt | 5×10*
3.5.1 For rigid rotors, under operating conditions, the actual first critical speed of the rotor should be 26% higher than the maximum allowable continuous speed. 352 For flexible rotors, under operating conditions, the rotor’s actual first critical speed should be higher than 26% of the maximum allowable continuous speed. The actual first critical speed should be lower than 15% of the minimum allowable continuous speed, and the actual second critical speed should be higher than 26% of the maximum allowable continuous speed. 3.5.3 For motor-braked expanders, the critical speed of the low-speed gear shaft. It should not be within 85%~115% of the speed of the high-speed gear shaft. 3.6 Noise
In working conditions, the noise value of the expander equipped with large and medium-sized air separation equipment shall not exceed 89dB(A) with small air separation. The noise value of the equipment's expander shall not exceed 85dB(A): the measurement method can refer to the provisions of GB/T2888 3.7 Vibration
3.7.1 Use a non-contact instrument for shaft vibration measurement, and measure next to the supporting bearing. , its amplitude value is shown in Appendix A (standard appendix). 3.7.2 The vibration of the bearing box is measured with a contact instrument fixed on the bearing box, and its root mean square vibration speed (vibration intensity) um2
value Should be lower than 4.5mm/s. See Appendix A for its amplitude value. JB/T 5904.1-1999
3.8 The continuous operation period of the expander is not less than the operation period specified by the complete set of equipment, and it is freely adjustable, stable and reliable. 3.9 Complete set supply of expander to Fanguo
a) Completely assembled energy expander:
b) Motor, speed change mechanism and mounting chassis of the motor brake type expander; c) Oil supply system :
d) Measuring instruments (or as specified in product technical documents); e) Special tools necessary for loading and unloading the expander: spare wearing parts.
If the above supply scope is increased or decreased, it will be supplied according to the contract signed with the user. The control, switching, heating and safety protection devices of the expansion machine are all equipped with supporting equipment. 3.10 Quality Guarantee Period
Provided that the user abides by the transportation, storage, installation, and usage rules stipulated in the expansion machine operation and maintenance instructions, it will be within 18 months from the date of shipment from the manufacturer (the oil seal validity period shall not exceed 12 months), the use period does not exceed 12 months, when the product is damaged or cannot work properly due to poor manufacturing quality, the manufacturer shall be responsible for replacing or repairing it for the user free of charge (excluding wearing parts) 4 Test methods ||tt ||4.1 No-load operation test
4.1.1 Perform no-load operation for 2 hours under the design speed condition. 4.1.2 Under the design speed condition, the bearing temperature of the expansion machine shall not be greater than the requirements of the design drawing, and the amplitude shall comply with the requirements of 3.7. 4.1.3 After 2 hours of no-load operation, perform an overspeed test at 120% of the design speed for 1 minute and measure the residual deformation, which should comply with the regulations in JB/5904.2 (dynamic balance should be recalibrated after overspeeding). 4.1.4. After the test, the expander is disassembled and inspected. Defects that affect the quality of the friction surfaces such as the main shaft, bearings, gears, seals, etc. are not allowed. 4.2 Performance test
According to needs and conditions, product testing can be conducted at the manufacturer or at the user's site. 4.2.1 Test principle
According to the performance similarity conditions of the expansion machine, the test must meet the following four criteria. Specific speed: n
ng
Ah
Specific diameter: D,DAh
Number of horse thorns: Ma==
c
Reynolds number: Re:
uD
where: expander speed, r/s;
gv—expander outlet volume flow, m*/s; Ah,||tt ||The melting drop of an expander, J/kg;
(2)
(3)
(4)
(5)||tt ||3
D expansion machine.T. outer diameter of the working wheel, m
JB/T5904.11999
——Inlet measured peripheral speed of the expansion machine T. working wheel, m /s; - the local sonic velocity of the working medium of the expander, m/s: V
- the kinematic viscosity of the working medium at the inlet of the working wheel of the expander, m\/s. 4.2.2 Test requirements
4.2.2.1 If the isotropic index k of the test medium is equal, take the expansion ratio V=EG
If the isotropic index of the test medium is not equal, the expansion ratio must satisfy the formula ( 7). 6V=6G
my
mG=
where: ev—expansion ratio of the expander during performance test: 8. -Expansion ratio of the expander under design conditions; mv—variable index of test medium;
mo—variable index of T as medium;
ky—isotropic index of test medium:
ka
The equal picking index of the working medium.
1
my
mG
kv-1
ky
1
ko -1||tt| |1-
kg
4.2.2.2 If the Reynolds number satisfies equation (10) during the performance test, the influence of the Reynolds number can be ignored. Ren2Rev>106
If the Reynolds number does not satisfy equation (10), correct the equal picking efficiency test value according to the value-added equation (11). Revyo.2
1(1)
Re
Reynolds number under design T condition:
where: Rec
Rey||tt ||n
The Reynolds number during the performance test;
The isotropic efficiency of the expander during the performance test. 4.2.2.3 The critical Mach number is used as the benchmark during the performance test and complies with equation (12). May'≥Mae'
Mav'-uJe,
Mag'ug/ce'-
Where: May-critical Mach number during performance test; Ma. —Critical Mach number under design conditions; peripheral speed of expander working wheel inlet during performance test, m/s; (6)
·(7)
(8)
(9)
(10)
(11)
·(12)
(13)
(14)
α —The critical sound speed of the expander nozzle during the performance test. For subsonic nozzles, take the local sound speed at the nozzle outlet, m/s; the peripheral speed of the expander T impeller inlet under design conditions, m/s; 4||tt ||JB/T5904.1—1999
G--The critical sound speed of the expander nozzle under design conditions. For subsonic nozzles, take the local sound speed at the nozzle outlet, m/s. 4.2.2.4 The test speed shall not be higher than 120% of the working speed. 4.2.2.5 The test medium must be pure, and gas path blockage and leakage are not allowed to occur under test conditions. 4.2.2.6 Test measuring instrument
4.2.2.6.1 The accuracy of the measuring panel instrument shall be in accordance with the requirements in Table 1. Table 1
item
Leli meter accuracy grade
thermometer (including secondary instrument) accuracy
K
flow meter accuracy %||tt ||Tachometer accuracy %
Power meter accuracy %
month
fine
0.4
0.1
2.5
Degree
4.2.2.6.2 The installation of the expander flow meter shall be in accordance with the regulations of GB/T2624. The installation of other instruments may refer to the regulations on the measurement methods of electricians and thermal T meters. The accuracy of measurement must be ensured. The performance test device adopts a closed cycle low-temperature test process (Figure 2). If the above requirements are met, the exhaust expansion low-temperature test process [Appendix B (Standard Appendix)) or other tests can also be used. method. 9
p
Build Qi
Old Qi
Jiao
District
Shadow expansion machine liquid volume
Pressure at the outlet and behind the mouth
Inlet and outlet warm seats
Shadow expansion machine speed
halogen
1 Compressor: 2-Gas cooler: 3--Moisture Height divider; 4—filter adsorber: 5—heat exchanger: 6 filter: 7 air flow balancer: 8 turbine expander (test turbine): 9 flow meter: 10—balance sheet: 11—measuring instrument screen : 12--brake winding; 13-insulated cold box Figure 2 Closed cycle low temperature performance test process
4.2.3 test steps
JB/T 5904.11999
4.2.3.1 The pressure vessels in the test device should comply with the "Pressure Vessel Safety Technical Supervision Regulations" and relevant standards. 4.2.3.2 The pipelines of the test device must not leak or be blocked. The test instrument must be confirmed to be in normal use and within the validity period of the qualification. 4.2.3.3 The operation of the test device shall be carried out in accordance with the relevant operating instructions. 4.2.3.4 The test simulation value is converted according to the conditions of the test device, and the test working conditions are stabilized. 4.2.3.5 Each set of measured data should be carried out at the same time as much as possible. Take 5 sets of parameters at consecutive measuring points, and the operating parameters during the test process. The allowable fluctuation range is as specified in Table 2.
Table 2
Operating parameters
Inlet pressure
Export force
Inlet temperature
Speed
Turn||tt ||The maximum allowable relative deviation between the test value and the similar simulated value 2
2
2
4.2.4 Test results
±%
The maximum allowable fluctuation range of each group of test values ??relative to its average value is 2
2
4.2.4.1 Calculated separately using 5 groups of test values. The average value of the equal picking efficiency is taken as the test result, and is determined by the instrument. The absolute error of the amortized efficiency value caused by accuracy is controlled within 1%.
Equal sieving efficiency:
where: A in
-the actual roasting drop of the expander, J/kg.
4.2.4.2 The characteristic curve of the expander
4.2.4.2.1 The characteristic curve of the expander refers to the curve or
where: v-
speed ratio (special persistence ratio).
n.-q.)
4.2.4.2.2 The test points of the expander characteristic curve should not be less than 7 points, and the number of points distributed on both sides of the curve should be approximately equal. 4.2.4.3 The test report must be signed by the tester and inspection personnel and approved by the competent authority. 5 Inspection Rules
5.1 The inspection of the expander is divided into factory inspection and type inspection. 5.2 Factory inspection
5.2.1 Expander products should be remotely inspected for factory inspection. 5.2.2 Factory inspection content
a) Quality inspection of product parts;
b) No-load operation test:
c) Internal inspection of the test;
d) Visual inspection.
5.3 Type inspection
6
(15)
(16)
(17)
JB/T 5904.11999||tt ||5.3.1 Type inspection should be carried out when trial production products, old products are transferred to factories for production, when the product structure design is significantly modified or when the contract requires it. 5.3.2 Type inspection content
a) The product passes factory inspection:
b) Perform performance test.
5.4 Judgment Rules
5.4.1 The product must pass factory inspection and type inspection (if no type inspection is performed, this item is exempted), and must pass the inspection by the technical inspection department of the manufacturer, with the product attached Only with quality certification documents can it leave the factory. 6Marking, packaging, transportation and storage
6.1 Logo
6.1.1 Each expander should be nailed with a product label in a conspicuous position, and its size and technical requirements should comply with the relevant regulations of GB/T13306. 6.1.2 Sign content
a) Name of the manufacturer;
b) Name and model of the expansion machine;
c) Technical parameters (design conditions) of the expansion machine: Flow rate (0 ℃, 101.325kPa), m/h inlet/outlet pressure (gauge pressure), MPa:
inlet temperature, K;
rotor speed, r/min;
weight plate, kg;
d) Factory number:
e) Year and month of manufacture.
6.2 Packaging
6.2.1 The packaging of the expander should comply with the regulations of GB/T13384. 6.2.2 Before packaging, the oil and water accumulated in all parts of the product should be removed. Exposed and unpainted processing surfaces of product parts (excluding non-ferrous metals) must be coated with an anti-rust layer or given appropriate protection. 6.2.3 The packaging of the expander should ensure that accessories, documents, etc. are not damaged or lost during transportation. Marks such as rainproof, moisture-proof, shockproof, and no inversion should be printed on the outside of the packaging box. The markings should comply with the relevant regulations of GB191. 6.2.4 Each expander (set) should be accompanied by the following documents when leaving the factory, and should be sealed in a watertight bag. a) Factory certificate of conformity:
b) Random documents, including:
Operation and maintenance instructions:
Flow chart:
Installation diagram;
Total Views and main component diagrams:
Spare parts list;
Special tool list:
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