This standard specifies the performance test method of surface feedwater heaters to determine the following performance indicators of feedwater heaters under design conditions: A. Feedwater end difference; B. Feedwater temperature rise; C. Drain end difference; D. Feedwater pressure drop; E. Steam pressure drop and (or) drain pressure drop; F. Other contents agreed upon by both parties. This standard applies to the performance test of surface feedwater heaters for power stations. JB/T 5862-1991 Performance test procedures for steam turbine surface feedwater heaters JB/T5862-1991 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
Performance Test Procedure for Surface Feedwater Heater for Steam Turbine Subject Content and Scope of Application
JB/T5862-91
This standard specifies the performance test method for surface feedwater heaters to determine the following performance indicators of feedwater heaters under design conditions:
Feedwater end difference;
Feedwater temperature rise;
Drain end difference;
Feedwater pressure drop;
Steam pressure drop and (or) drain pressure drop;
Other contents agreed upon by both parties to the test.
This standard applies to the performance test of surface feedwater heaters for power stations. 2 Reference standards
GB8117
GB2624
GB10764
Test procedures for thermal performance of power plant steam turbines
Flow measurement
Technical conditions for low-pressure feedwater heaters for steam turbines 3 Items, symbols, units and instructions
Items applicable to all heaters are shown in Table 1. Table 1
Heat load in condensation zone (design value)
Steam flow rate (measured value)
Steam flow rate (design value)
Steam inlet pressure (measured value)
Steam inlet pressure (design value)
Steam inlet temperature (measured value)
Steam inlet temperature
Saturated steam temperature corresponding to steam inlet pressure Steam pressure in heater (measured value) Ministry of Machinery and Electronics Industry 1991-10-24 Approval symbol
The heat transferred to the feed water, provided by the designer for the steam quantity W-Wa for heating the feed water
Take it from Heat balance calculation
Measured by spring tube pressure gauge, mercury pressure gauge or pressure sensor Taken from heat balance calculation
Measured by resistance or thermocouple thermometer
The melting point of dry saturated steam or superheated steam is based on P, and t. Direct steam property table, the value of wet steam is obtained by measuring steam humidity or according to turbine heat balance
Based on P. Check steam property table
Measured by spring tube pressure gauge, mercury pressure gauge or pressure sensor -
1992-10-01Implementation
Saturated steam temperature in heater
Saturated steam in heater Temperature (design value) Feedwater flow rate (measured value)
Feedwater flow rate (design value)
Feedwater inlet pressure (measured value)
Feedwater inlet pressure (design value)
Feedwater outlet pressure (measured value)
Feedwater outlet pressure (design value)
Feedwater pressure drop (measured value)
Feedwater pressure drop (design value)
Feedwater pressure drop (calculated value)
Feedwater inlet temperature (measured value)
Feedwater inlet temperature (design value)
Feedwater outlet temperature (measured value)
Feedwater outlet temperature (design value) Value
Feedwater outlet temperature (calculated value)
Feedwater temperature rise (calculated value)
Feedwater end difference (calculated value)
Drain flow rate entering this stage (measured value or calculated value)
Drain inlet pressure (measured value)
Drain inlet temperature (measured value)
Drain outlet flow rate (measured value)
Drain outlet flow rate (design value)
Drain outlet pressure (measured value)
Drain outlet temperature (measured value)
Condensation zone heating area (design value)
Thermal resistance of feedwater liquid film in condensation zone (measured value) Calculated value) Thermal resistance of the water film in the condensation zone (design value) Thermal resistance of the dirt on the water supply side of the condensation zone (presumed value) Thermal resistance of the dirt on the water supply side of the condensation zone (design value) Thermal resistance of the pipe wall in the condensation zone (measured value)
Thermal resistance of the pipe wall in the condensation zone (design value)
Thermal resistance of the dirt on the steam side of the condensation zone (assumed value) Thermal resistance of the dirt on the steam side of the condensation zone (design value) Thermal resistance of the liquid film on the steam side of the condensation zone (calculated value) Thermal resistance of the liquid film on the steam side of the condensation zone (design value) Total thermal resistance of the condensation zone (calculated value)
Heat capacity of the cold fluid in the condensation zone (measured value) Heat capacity of the cold fluid in the condensation zone (design value) Number of heat transfer units in the condensation zone
Condensation Heat transfer effectiveness of zone
JB/T586291
According to P: Check steam property table
Provided by designer
Measured by flow meter
Taken from heat balance calculation
Measured by spring tube pressure gauge or pressure sensorProvided by designer
Measured by spring tube pressure gauge or sensor
Provided by designer
Measured by differential pressure gauge
Provided by designer
Obtained by calculation
Measured by resistance or thermocouple thermometer
Taken from heat balance calculation
Measured by resistance Measured by flow meter or obtained by heat balance calculation
Obtained by calculation
Test result corrected to design condition t:-t: Test result corrected to design condition t-tiMeasured by flow meter or obtained by heat balance calculationMeasured by bourdon pressure gauge, mercury pressure gauge or pressure sensorMeasured by resistance type or thermocouple thermometer
Measured by flow meter or obtained by heat balance calculationTaken from heat balance calculation
Measured by bourdon pressure gauge, mercury pressure gauge or pressure sensorMeasured by resistance type or thermocouple thermometer
Effective area provided by designer||t t||Obtained by calculation
Provided by designer
Determined by agreement
Provided by designer
Provided by designer
Determined by agreement
Provided by designer
Obtained by calculation
Provided by designer
The sum of various thermal resistances in the condensation zone
Calculated according to test data
Taken from heat balance calculation or provided by designer
Obtained by calculation
JB/T5862—91
Additional items applicable to the built-in drain cooling area are shown in Table 2. Table 2
Drain inlet temperature of drain cooling zone (measured value)Drain inlet temperature of drain cooling zone (design value)Transition water temperature between drain cooling zone and condensing zone (calculated value)Transition water temperature between drain cooling zone and condensing zone (design value)Drain outlet temperature (design value)
Drain outlet temperature (calculated value)
Drain end difference (calculated value)
Heat load of drain cooling zone (design value)
Pressure drop of drain cooling zone (measured value)
Pressure drop of drain cooling zone (design value)
Pressure drop of drain cooling zone (calculated value)
Heating area of ​​drain cooling zone (design value)Liquid film thermal resistance on the water supply side of drain cooling zone (calculated value)Liquid film thermal resistance on the water supply side of drain cooling zone (design value)Fouling thermal resistance on the water supply side of drain cooling zone (assumed value)Fouling on the water supply side of drain cooling zone Fouling thermal resistance (design value) Thermal resistance of pipe wall in drain cooling zone (measured value) Thermal resistance of pipe wall in drain cooling zone (design value) Fouling thermal resistance on condensate side in drain cooling zone (assumed value) Fouling thermal resistance on condensate side in drain cooling zone (design value) Liquid film thermal resistance on condensate side in drain cooling zone (calculated value) Liquid film thermal resistance on condensate side in drain cooling zone (design value) Total thermal resistance in drain cooling zone (calculated value)
Heat capacity of hot fluid in drain cooling zone (measured value) Heat capacity of hot fluid in drain cooling zone (design value) Heat capacity of cold fluid in drain cooling zone (measured value) Heat capacity of cold fluid in drain cooling zone (design value) Ratio of heat capacity in drain cooling zone (calculated value) Number of heat transfer units in drain cooling zone (calculated value) Heat transfer effectiveness in drain cooling zone (calculated value) Fu
△Pae
Additional items applicable to superheated steam cooling zone are shown in Table 3. 3.3
Measured by resistance or thermocouple thermometer (use ts when it cannot be measured)
Provided by designer
Calculated
Provided by designer
Taken from heat balance calculation
Calculated
Test results corrected to design conditions tt
Provided by designer
Calculated with PP&
Provided by designer
Calculated
Effective area provided by designer
Calculated
Provided by designer
Determined by agreement
Provided by designer
Tds=r'se
Provided by designer
Determined by agreement|| tt||Provided by the designer
Calculated by calculation
Provided by the designer
Sum of various thermal resistances in the drain cooling zone
Calculated according to test data
Provided by the designer
Calculated according to test data
Provided by the designer
Calculated by calculation
Calculated by calculation
Calculated by calculation
Steam outlet temperature in superheated steam zone
Steam outlet temperature in superheated steam zone (design value)Steam inlet temperature (design value)
JB/T5862—91
Transition feed water temperature between superheated steam zone and condensation zone (calculated value)Transition feed water temperature between superheated steam zone and condensation zone (design value)Superheated steam Heat load of the zone (design value)
Pressure drop in superheated steam zone (measured value)
Pressure drop in superheated steam zone (design value)
Pressure drop in superheated steam zone (calculated value)
Heating area of ​​superheated steam zone (design value)Liquid film thermal resistance on the feed water side of superheated steam zone (calculated value)Liquid film thermal resistance on the feed water side of superheated steam zone (design value)Fouling thermal resistance on the feed water side of superheated steam zone (assumed value)Fouling thermal resistance on the feed water side of superheated steam zone (design value)Tube wall thermal resistance in superheated steam zone (measured value)Tube wall thermal resistance in superheated steam zone (design value)Fouling thermal resistance on the steam side of superheated steam zone (assumed value)Fouling thermal resistance on the steam side of superheated steam zone (design value)Liquid film thermal resistance on the steam side of superheated steam zone (calculated value)Liquid film thermal resistance on the steam side of superheated steam zone (assumed value) =Calculated value) Total thermal resistance of superheated steam zone
Heat capacity of hot fluid in superheated steam zone (measured value)Heat capacity of hot fluid in superheated steam zone (design value)Heat capacity of cold fluid in superheated steam zone (measured value)Heat capacity of cold fluid in superheated steam zone (design value)Ratio of heat capacity of superheated steam zone
Number of heat transfer units in superheated steam zone (calculated value)Effectiveness of heat transfer in superheated steam zone
Contents that need to be negotiated by both parties:
Specific test purpose;
Performance test methods of related auxiliary equipment; Operation mode of heater;
Methods to ensure constant feed water volume and steam inlet parameters; Methods for measuring water drainage;
Use of other instruments except those specified in this standard; Methods for instrument calibration and rechecking.
Condition of heater during test.
4.2.1The surface of heater tube should be clean.
m℃/W
m*℃/W
Not necessary to measure
Provided by designer
Taken from heat balance calculation
Determined by calculation
Provided by designer
Provided by designer
Determined by agreement
Provided by designer
Ia=r's
Provided by designer||tt| |Determined by agreement
Provided by the designer
Obtained by calculation
Provided by the designer
The sum of various thermal resistances in the superheated steam zone
Calculated by test data
Provided by heat balance calculation and designer
Calculated by test data
Provided by heat balance calculation and designer
Obtained by calculation
Obtained by calculation
Obtained by calculation
JB/T5862-91
4.2.2 The amount of condensed water on the steam side of the heater should be discharged continuously and the normal water level should be maintained. 4.2.3 Non-condensable gases should not accumulate on the steam side of the heater. There are often some non-condensable gases in the steam. If these gases accumulate in the heater, the heat transfer performance of the heater will deteriorate. To prevent this from happening during the test, the exhaust valve should be adjusted to release a certain amount of steam so that the temperature rise of the liquid through the heater is the largest and stable.
All non-condensable gases entering the heater should be switched to other places during the test. 4.3 Preparation for the test
4.3.1 Familiarize yourself with and check the heater and its related equipment, and the conditions should be normal. -4.3.2 Purpose of the preliminary test:
Check the instrument;
Train the test personnel;bzxZ.net
Make further adjustments,
4.4 Formal test
4.4.1 Stability of test conditions
4.4.1.1 Before the test begins, the heater should reach a stable operating condition and maintain this stable condition throughout the test. 4.4.1.2 The water level of the heater should be kept within the normal range. If the water level during the test exceeds the normal range, it should be recorded and all test data at this time should be invalidated.
4.4.1:3 To reduce the amount of correction, the test should be carried out under the design conditions as much as possible. The deviation between the feed water flow rate and the extraction steam pressure and the design value shall not exceed ±10%. When the deviation exceeds the specified value, it shall be resolved by negotiation between the two parties of the test. 4.4.1.4 During the test or calculation and collation of the test results, if it is found that the obtained data is seriously inconsistent, all or part of the data of the test shall be invalidated and the test shall be repeated. 4.4.2 Duration of the test and frequency of readings 4.4.2.1 To ensure the correctness and consistency of the test results, each test should be run continuously for a sufficiently long time. For a single test, under stable conditions, the recording time of the test is generally half an hour. 4.4.2.2 During the test, in order to determine whether the load conditions are stable, the feed water temperature and steam pressure shall be recorded at least once every 5 minutes, and other readings shall be recorded at least once every 10 minutes.
5 Location of test points
Figures 1, 2, 3 and 4 show the conventional layout of various horizontal heaters and the test points required to obtain performance data.
Figure 1 Layout of test points for heaters consisting of superheating zone, junction zone and drain cooling zone115
JB/T5862-91
The test points for vertical heaters are similar to those for horizontal heaters. Layout of test points for heaters consisting of superheating zone and condensation zoneFigure 2
Figure 3
Layout of test points for heaters consisting of condensation zone and drain cooling zonePt
Figure 4 Layout of test points for heating zone of single condensation zoneJB/T5862-91
5.3 The final location of all test points shall be agreed upon by both parties to the test, but the internal design of the heater and the layout of the external piping shall be taken into account. 5.4 The measuring points ta, t and t indicated in the figure are calculated values ​​and are not required to be measured. In the calculation process, their design values ​​will be used. 6 Instruments and measurement methods
6.1 Atmospheric pressure measurement
6.6.1 Atmospheric pressure can be measured by a standard mercury barometer with an accuracy of ±30Pa (0.3mb), or by other types of barometers that have been certified by the metrology department to have the same accuracy. 6.1.2 If the height of the barometer and the heater are inconsistent, the height difference should be corrected. 6.1.3 The installation location of the mercury barometer should avoid the influence of sunlight, wind and heat radiation. 6.2 Pressure measurement
6.2.1 When the absolute pressure is higher than 0.20MPa, a spring tube pressure gauge is used for measurement; when the absolute pressure is lower than 0.20MPa, a mercury pressure gauge is generally used.
6.2.2 The mercury pressure gauge must be made of high-grade lead-free glass tube products. It must be placed vertically during measurement. If a single-tube pressure gauge is used, the inner diameter of the glass tube is required to be uniform and preferably not less than 12mm to reduce the influence of capillary action. In the entire working height range, all cross-sectional areas of the liquid storage cup must be exactly equal.
6.2.3 Pressure measurement can also use a pressure transmitter or absolute pressure transmitter with equivalent accuracy level as the primary sensing element for measuring pressure. Correspondingly, a special meter or patrol detection device with equivalent accuracy level can be used as a secondary measuring instrument. 6.3 Differential pressure measurement
Differential pressure can be measured by a liquid differential pressure gauge or differential pressure transmitter. 6.4 Temperature measurement
6.4.1 Resistance thermometers with appropriate ranges and scales should be used. Based on the agreement between the two parties, properly calibrated thermocouples or other temperature detectors may also be used.
6.4.2 The temperature measurement point should be as close as possible to the corresponding pressure measurement point. The thermometer sleeve shall not be installed in a dead corner of the flow or immediately downstream of the confluence point. The installation location should be convenient for maintenance. When the inclination meter is installed near the pipe, the influence of thermal radiation should be reduced. 6.4.3 Thermometer sleeve
6.4.3.1 The wall of the sleeve should be as thin as possible and the diameter as small as possible. 6.4.3.2 The sleeve should be clean, dry, corrosion-resistant or oxidation-resistant. 6.4.3.3 The sleeve should have good thermal contact with the sensing element. 6.4.3.4 The portion of the sleeve extending outside the container should be as short as possible and properly insulated. 6.4.3.5 The sleeve should be sufficiently tight when fastened to the container. 6.5 Water volume measurement
6.5.1 The water supply and drainage volume can be measured by a calibrated nozzle, orifice plate or venturi tube flowmeter. 6.5.2 The flowmeter should be installed upstream of the place where the liquid in the pipeline may be vaporized. 6.5.3 The throttling device and its pipeline conditions should comply with the provisions of GB2624. 6.5.4 The installation of the throttling device and the differential pressure measurement method should comply with the provisions of GB8117. 6.6 Instrument accuracy
6.6.1 All instruments should be calibrated before and after the test. 6.6.2 The allowable error of the instrument selected for the test. 6.6.2.1 Pressure
Steam inlet pressure±0.25%
Steam pressure in shell±0.25%
Drain inlet pressure±2.00%
Drain outlet pressure±2.00%
Water supply inlet pressure
Water supply outlet pressure
Water supply pressure
6. 6. 2. 2
Steam inlet temperature
Drain inlet temperature
Drain outlet temperature
Feedwater inlet temperature
Feedwater outlet temperature
>300℃
300℃
Feedwater flow±2%
Drain inlet flow·±2%
JB/T5862—91
Drain outlet flow·±2%
If the allowable error of the instrument exceeds the provisions of Article 6.6.2, it shall be resolved through negotiation between the two parties of the test. When making the final evaluation of the heater performance, 6.6.3
The accuracy of the instrument used in the test shall be taken into account. Calculation of test results
7.1 In the calculation of the test results, the latest version of the internationally recognized water vapor performance table shall be used; when using a computer for calculation, the calculation formula for the thermodynamic properties of water and water vapor of the International Formula Committee (TFC) shall be used to compile the calculation program. Tables 4, 5, 6 and 7 are a convenient way to record the design, measurement and calculation data used in the calculation test results. Some items that are not applicable to any type of heater may be omitted. If the heater consists only of a superheated steam zone arranged in countercurrent, use the appropriate items in Table 4 or Table 5; if the heater consists only of a drain cooling zone arranged in countercurrent, use the appropriate items in Table 4 or Table 6. This method does not include any other flow arrangements.
The terms and symbols used in the tables are explained in detail in Chapter 2. The formulas used to calculate the data are shown in detail in Section 7.2. Table 4 Data sheet of three-stage heater
Superheated steam zone
Condensation zone
Drain cooling zone
Calculation plant
Superheated steam zone
JB/T5862—91
Continued Table 4
Condensation zone
Water cooling zone
Calculation,
JB/T5862—91
5 Data sheet of two-stage heater (superheated steam zone and condensation zone) Table 5
Superheated steam zone
Condensation zone
Calculation!
Superheated steam zone
JB/T5862-91
Continued table 5
Condensation zone
Data sheet for two-stage heater (condensation zone and drain cooling zone) Condensation zone
Drain cooling zone
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