Electrostatic precipitator - Methods of performance tests
1 Scope
This standard specifies the test items, test methods and report preparation requirements of electrostatic precipitator performance.
This standard is applicable to the performance test of electrostatic precipitators, and may be referenced to for wet electrostatic precipitators (WESP) and electrostatic fabric filters.
2 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
2.1
standardized status of flue gas
condition of flue gas at the temperature of 273 K and the atmospheric pressure of 101,325 Pa, called standardized status for short
Note: For the purpose of this standard, the concentration of air pollutants refers to the value of dry flue gas at standardized status.
2.2
isokinetic sampling
sampling mode in which the velocity of dusty flue gas entering the sampling nozzle is equal to that of dusty flue gas at the sampling point on the flue section
2.3
equivalent diameter
diameter of a circular flue, or the result of 2 (length × width) divided by (length + width) for a rectangular flue, expressed in m
2.4
internal sampling
mode of putting both the sampling nozzle and the filter in the flue for direct sampling
2.5
multi-points moving sampling
sampling mode of moving a same sampling device on the given sampling points, with same sampling time for each point
2.6
flue gas humidity
content of vapor in the flue gas coexisting with 1 kg dry flue gas
2.7
power consumption of electrostatic precipitator
total active power consumed by high- and low-voltage power supply equipment (PSE) of electrostatic precipitator in unit time, expressed in kW
3 Test items
Test items include:
a) collection efficiency;
b) body pressure drop;
c) body air leakage percentage;
d) power consumption of electrostatic precipitator.
4 Test methods
4.1 Collection efficiency test
4.1.1 Overview
The dust concentration of flue gas at the inlet and outlet of the electrostatic precipitator and the air leakage percentage of the electrostatic precipitator body will be tested simultaneously, and then the collection efficiency will be calculated based on the data obtained.
4.1.2 Requirements for sampling position and holes and number of sampling points
4.1.2.1 Sampling position
The sampling position shall be selected from the straight pipe segment with stable gas flow, and its distance from interference sources such as elbows and reducers shall be greater than 6 and 3 times of equivalent diameter in the downstream and upstream directions respectively. To select such location, vertical pipe segment shall be given priority. When the flue length cannot meet the above requirements, the relatively suitable pipe segment may be selected as the sampling position based on actual situations.
Foreword i
1 Scope
2 Terms and definitions
3 Test items
4 Test methods
4.1 Collection efficiency test
4.2 Body pressure drop test
4.3 Test of body air leakage percentage
4.4 Power consumption test of electrostatic precipitator
4.5 Flow velocity and rate tests of flue gas
4.6 Flue gas humidity test
4.7 Flue gas temperature test
5 Requirements for preparation of test report
Annex A (Normative) Water vapor pressure and humidity when air is saturated at 101,325 Pa
Electrostatic precipitator - Methods of performance tests
1 Scope
This standard specifies the test items, test methods and report preparation requirements of electrostatic precipitator performance.
This standard is applicable to the performance test of electrostatic precipitators, and may be referenced to for wet electrostatic precipitators (WESP) and electrostatic fabric filters.
2 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
2.1
standardized status of flue gas
condition of flue gas at the temperature of 273 K and the atmospheric pressure of 101,325 Pa, called standardized status for short
Note: For the purpose of this standard, the concentration of air pollutants refers to the value of dry flue gas at standardized status.
2.2
isokinetic sampling
sampling mode in which the velocity of dusty flue gas entering the sampling nozzle is equal to that of dusty flue gas at the sampling point on the flue section
2.3
equivalent diameter
diameter of a circular flue, or the result of 2 (length × width) divided by (length + width) for a rectangular flue, expressed in m
2.4
internal sampling
mode of putting both the sampling nozzle and the filter in the flue for direct sampling
2.5
multi-points moving sampling
sampling mode of moving a same sampling device on the given sampling points, with same sampling time for each point
2.6
flue gas humidity
content of vapor in the flue gas coexisting with 1 kg dry flue gas
2.7
power consumption of electrostatic precipitator
total active power consumed by high- and low-voltage power supply equipment (PSE) of electrostatic precipitator in unit time, expressed in kW
3 Test items
Test items include:
a) collection efficiency;
b) body pressure drop;
c) body air leakage percentage;
d) power consumption of electrostatic precipitator.
4 Test methods
4.1 Collection efficiency test
4.1.1 Overview
The dust concentration of flue gas at the inlet and outlet of the electrostatic precipitator and the air leakage percentage of the electrostatic precipitator body will be tested simultaneously, and then the collection efficiency will be calculated based on the data obtained.
4.1.2 Requirements for sampling position and holes and number of sampling points
4.1.2.1 Sampling position
The sampling position shall be selected from the straight pipe segment with stable gas flow, and its distance from interference sources such as elbows and reducers shall be greater than 6 and 3 times of equivalent diameter in the downstream and upstream directions respectively. To select such location, vertical pipe segment shall be given priority. When the flue length cannot meet the above requirements, the relatively suitable pipe segment may be selected as the sampling position based on actual situations.
Contents of GB/T 13931-2017
Foreword i
1 Scope
2 Terms and definitions
3 Test items
4 Test methods
4.1 Collection efficiency test
4.2 Body pressure drop test
4.3 Test of body air leakage percentage
4.4 Power consumption test of electrostatic precipitator
4.5 Flow velocity and rate tests of flue gas
4.6 Flue gas humidity test
4.7 Flue gas temperature test
5 Requirements for preparation of test report
Annex A (Normative) Water vapor pressure and humidity when air is saturated at 101,325 Pa
