HJ 818-2018Technical specifications for operation and quality control of ambient air quality continuous automated monitoring system for SO2, NO2, O3 and CO (English PDF)

4.1 System composition

Continuous automatic monitoring system for ambient air gaseous pollutants (SO2, NO2, O3, CO) is calculated by air quality monitoring substation and center it consists of a machine room, a quality assurance laboratory, and a system support laboratory.

4.2 Air Quality Monitoring Substation

4.2.1 Main functions and components

Continuous automatic monitoring of ambient air quality and meteorological conditions (including temperature, air pressure, humidity, wind direction, wind speed, etc.), collection, Process and store monitoring data, and periodically transmit monitoring data and device operating status information to the central computer.

The air quality monitoring substation is mainly composed of substation station, sampling device, monitoring instrument, calibration equipment, data acquisition and transmission equipment, Auxiliary equipment and other components.

4.2.2 Basic requirements

The monitoring substation station and surrounding environment should meet the relevant requirements of HJ 193.

4.2.3 Instrument and equipment configuration

The equipment configuration of the monitoring substation shall meet the relevant requirements of HJ 654.

4.3 Central Computer Room

4.3.1 Main functions

Collect monitoring data and equipment working status information of each monitoring substation through wired or wireless communication equipment, and collect monitoring data Perform automatic identification and storage; perform statistical processing and analysis on the collected monitoring data; remotely diagnose the monitoring instruments of the monitoring substation and calibration.

4.3.2 Basic requirements

a) The size of the central computer room should ensure that the operator is working properly.

b) The central computer room shall have a sealed window structure. When conditions permit, the door and machine room can be equipped with a buffer room to prevent dust and dirt from entering the machine.

room.

c) The central computer room should be equipped with temperature and humidity control equipment. The temperature of the equipment room is controlled at 25 °C ± 5 °C, and the relative humidity is controlled at 80%.

the following.

d) The power supply voltage of the central computer room is 220V, and the voltage fluctuation cannot exceed ±10%. The power supply system should be equipped with a power supply overvoltage, the load and leakage protection devices must have a good grounding circuit with a grounding resistance of <= 4 ohm. When available, UPS power is available.

e) The central computer room should be equipped with a dedicated communication line.

f) The central computer room should also comply with the relevant norms of the national environmental protection information system construction.

4.3.3 Device Configuration

4.3.3.1 Hardware Configuration

a) The central computer room should be equipped with more than 2 servers, one as a database server and one as an application server, the configuration should meet the needs of data processing work.

b) Connect the central computer room and the monitoring substation by wired or wireless communication. The bandwidth of the communication network should meet the data transmission requirements.

c) The hardware configuration should also comply with the relevant norms of the national environmental protection information system construction.

34.3.3.2 Software Configuration

a) Data acquisition and monitoring substation control software it can automatically and periodically collect the monitoring data, calibration record, equipment running status and substation power failure of each monitoring substation at any time.

Wait for event records.

It can automatically and manually monitor the monitoring substation monitoring instrument for zero calibration, span calibration, multi-point calibration and performance auditing.

The status of the monitoring data during calibration is automatically marked.

b) Data processing and report output software the abnormal value judgment condition can be set for the ambient air quality monitoring data and the weather parameter, and the abnormal value is marked.

Generate and store basic statistical reports, such as daily reports, weekly reports, monthly reports, quarterly reports, and annual reports, etc.

The formula shall comply with the relevant requirements of HJ 633 and HJ 663.

The collected monitoring data, instrument status parameters and generated statistical reports can be automatically stored as general data files and uploaded.

c) The software configuration should also comply with the relevant norms of the national environmental protection information system construction.

4.4 Quality Assurance Laboratory

4.4.1 Main functions Performing value transfer, calibration and performance audits of monitoring instruments and equipment; calibration and performance testing of monitored monitoring instruments and equipment test.

4.4.2 Basic requirements

a) The quality assurance laboratory should be sized to ensure that the operator is working properly.

b) The quality assurance laboratory shall adopt a sealed window structure and a buffer room to prevent dust and dirt from entering the laboratory.

c) The quality assurance laboratory shall be equipped with temperature and humidity control equipment. The laboratory temperature shall be controlled at 25 °C ± 5 °C, and the relative humidity shall be controlled.

80% or less.

d) The quality assurance laboratory power supply voltage is 220 V, and the voltage fluctuation cannot exceed ±10%. The laboratory power supply system should be equipped with electricity Source overvoltage, overload and leakage protection devices, the laboratory must have a good grounding circuit, grounding resistance <= 4 ohm.

e) The quality assurance laboratory shall be equipped with good ventilation equipment and exhaust gas discharge to keep the indoor air clean.

f) The quality assurance laboratory shall be equipped with a standard gas cylinder placement room (cabinet) and identified.

g) The quality assurance laboratory shall be equipped with the necessary test benches and storage cabinets.

h) Multiple quality assurance laboratories can be shared by multiple air quality monitoring substations.

4.4.3 Instrument Equipment Configuration the quality assurance laboratory shall be equipped with continuous air quality monitoring and quality assurance of ambient air gaseous pollutants (SO2, NO2, O3, CO).

Control related equipment and equipment, the basic equipment configuration list is shown in Table 1.

Table 1 List of basic equipment and equipment for quality assurance laboratory

Numbered instrument name technical requirements quantity use Same as the substation monitoring project Monitoring and analysis instrument Technical performance indicators with substation monitoring and analysis instruments Same or better than substation monitoring and analysis instrument 1 set of value transfer

2 Standard gas national certified standard substance or standard sample 1 set value transfer

3 Zero gas generator meets the relevant requirements of HJ 654 1 set value transfer

4 Dynamic gas calibrator meets the relevant requirements of HJ 654 1 set value transfer

45 Ozone calibrator is equipped with ozone generator, ozone photometer and feedback device.

6 Flowmeter 0~500 ml/min, l-level 2 sets of value transfer

7 Flowmeter 0~5 L/min, l-level 2 sets of value transfer

8 Flowmeter 0~20 L/min, l-level 2 sets of value transfer 9 standard thermometer level 1, resolution reaches ±0.1 °C 1 quantity transfer 10 pressure gauge 1 level 1 block gas path check Toxic gas leak Alarm system Ability to monitor SO2, NO, CO, O3 and other gases Measure and alarm 1 set of laboratory safety protection

4.5 System Support Lab

4.5.1 Main functions Carry out routine maintenance and maintenance of monitoring equipment and equipment; repair or replace faulty equipment.

4.5.2 Basic requirements the system support laboratory should be equipped with power, temperature and humidity control equipment, ventilation and corresponding workbench, storage cabinets, etc. Multiple air the quality monitoring substation can share 1 system support laboratory.

4.5.3 Instrument configuration the system support laboratory shall be equipped with equipment testing and maintenance equipment and tools, and shall be equipped with necessary spare monitoring instruments and spare parts.

The number of monitoring instruments used is generally not less than 1/4 of the total number of monitoring instruments in use.

5 daily operation and maintenance requirements

5.1 Basic requirements the automatic monitoring equipment for ambient air shall be operated continuously for 365 days (366 days in the following year) and shall be suspended for more than 3 days.

The competent department of point management shall record and take effective measures to resume operation in time. If you need to stop the operation, you must report it in advance.

Approved by the competent authority.

In the daily operation, due to instrument failure, it is necessary to temporarily use the standby monitoring instrument for monitoring, or to update the monitoring instrument due to equipment scrapping.

It shall be reported to the competent department in charge of the management of the point for record within one week after the instrument is replaced. Instrument updates must be performed in accordance with HJ 193.

The main technical parameters of the monitoring instrument should be consistent with the requirements of the instrument manual and the setting values at the time of system installation and acceptance. If you really need to when the technical parameters are adjusted, the parameter adjustment test and the instrument performance test shall be carried out, the test results shall be recorded and the parameter adjustment test report shall be prepared.

The adjustment of the main technical parameters shall be reported to the competent authority responsible for the management of the point.

The indication of the monitoring results shall be implemented in accordance with the relevant requirements of GB 3095.

5.2 Daily maintenance

5.2.1 Substation daily inspection the sub-station station and auxiliary equipment should be inspected regularly, and at least once a week. The inspections mainly include.

a) Check whether the temperature in the station is maintained at 25 °C ± 5 °C, and the relative humidity is kept below 80%. Pay attention to the station in winter and summer.

For internal and external temperature difference, the temperature of the station should be adjusted in time or appropriate temperature control measures should be taken for the sampling manifold to prevent the sampling device due to temperature difference.

Condensation occurs.

5b) Check if the intake and exhaust of the sampling manifold are normal.

c) Check the sampling branch for the presence of condensed water. If condensed water is present, it should be cleaned and dried in time.

d) Check if the station exhaust and exhaust device works normally.

e) Check if the gas cylinder valve is leaking and check the consumption of the standard gas.

f) Check that data collection, transmission and network communication are normal.

g) Check whether all kinds of operation and maintenance tools, instrument consumables and spare parts are intact.

h) Check whether the operation status of auxiliary equipment such as air conditioner and power supply is normal, check whether the filter screen of the air conditioner of the station room is clean, if necessary Wash it.

i) Check that all fire and safety facilities are in good condition.

j) Weeds and stagnant water around the station should be removed in time; branches that have an impact on the sampling or monitoring beam should be cut off in time.

k) Check whether the lightning protection facilities are normal, whether there is rain leakage in the sub-station houses, and whether the weather bar is damaged.

l) Record the inspection status. For the table style, please refer to Table D.1.

5.2.2 Monitoring equipment and equipment routine maintenance the equipment of the monitoring substation should be regularly maintained. The main contents include.

a) Remotely check the working status of the instrument remotely. When abnormalities are found, the relevant parts of the instrument should be maintained or replaced in time.

b) According to the requirements of the instrument manual, regularly check and clean the filter inside the instrument, the restriction hole, the reaction chamber, the gas pipeline, etc.

Key component. It should be inspected and cleaned in time after heavy pollution.

c) Periodically replace the UV lamp, photomultiplier tube, refrigeration unit, conversion furnace, and emission in the monitoring instrument according to the requirements of the instrument manual.

Key components such as light source (xenon lamp) and air pump membrane; after replacement, the instrument should be recalibrated and instrument performance tested.

Once the test is passed, it can be put into use.

d) The desiccant equipped with the instrument should be inspected weekly and replaced in time.

e) Periodically replace and clean the filter unit in the instrumentation as required by the instrument manual. Sampling branch and monitoring instrument connection the particulate filter membrane is normally replaced once every 2 weeks. In areas with high concentrations of particulate matter or in high concentrations, the particles should be treated as particles.

The actual pollution of the filter membrane increases the frequency of replacement.

f) The sampling manifold shall be cleaned at least once a year, and a leak test shall be performed after each cleaning.

Note. The sampling manifold leak test method is to connect a branch connector on the main pipe to the pressure gauge, and seal the other branch connector and sampling port, and then pump Vacuum to approximately 1.25 hPa, seal the suction port so that the entire sampling system is not connected to the outside, and the vacuum should not change within 15 minutes.

g) The sampling branch is cleaned at least once every six months and replaced if necessary.

h) Check the airtightness of the sampling branch and the instrument air circuit according to the requirements of the instrument manual.

i) Open optical path monitoring instrument shall perform at least 1 system automatic inspection, optical path inspection, xenon lamp fan and light intensity inspection every week.

The light intensity is obviously low, and the cause should be immediately identified and the fault should be eliminated in time. The front window glazing on the transmitting/receiving end is cleared at least every 3 months Clean once, and avoid damage to the coating on the lens surface when cleaning. Under normal circumstances, the xenon lamp is replaced once every 6 months, the longest replacement week the period cannot exceed one year.

5.2.3 Daily inspection of the central computer room the daily inspection of the central computer room includes.

a) The monitoring data of each substation and the transmission of the local central computer room and the data centers at all levels.

a) Clock and calendar settings for each substation computer.

b) Monitor data storage and back up monitoring data once every quarter.

6c) The security of the computer system.

d) Operating status of auxiliary equipment such as air conditioners and regulated power supplies.

5.2.4 Daily inspection of quality assurance laboratory the daily inspection of the quality assurance laboratory includes.

a) Quality assurance laboratory environmental conditions.

b) Calibrate the working status of the equipment.

c) The expiration date of the reference material.

d) Monitoring instrument metrology verification certificate, calibration report, verification calibration plan.

e) Operating status of auxiliary equipment such as air conditioners and regulated power supplies.

5.2.5 System support laboratory daily inspection the daily support of the system support laboratory includes.

a) The system supports laboratory environmental conditions.

b) Regular maintenance, inspection records and plans for monitoring equipment.

c) The working status of the standby monitoring instrument.

d) Consumables and spare parts usage.

e) The working state of the equipment for maintenance.

f) The operating status of auxiliary equipment such as air conditioners and regulated power supplies.

5.3 Troubleshooting

The faulty equipment should be inspected and repaired in a targeted manner.

a) Perform fault diagnosis and overhaul according to the requirements of the service manual provided by the instrument manufacturer.

b) for faults that can be diagnosed on site and can be solved by simple replacement of spare parts, such as solenoid valve control failure, the pumping membrane of the air pump is broken, the air circuit is blocked, and the light source is aging. It should be repaired in time and resume normal operation as soon as possible.

c) For instruments that cannot be repaired on site, they should be sent to the system support laboratory for inspection and repair, and timely Monitoring with a spare instrument.

d) After repairing ordinary wearing parts such as pump film, cooling fan, pneumatic joint or connector, zero/span calibration should be performed. Mechanical department Calibration and instrument performance testing should be performed after repairing critical components such as parts, optical components, inspection components, and signal processing components.

Once the test is passed, it can be put into use.

e) Inspection, calibration and testing should be documented and archived after each troubleshooting.

6 Quality Assurance and Quality Control

6.1 Quantitative traceability and delivery

6.1.1 Quantitative traceability and delivery requirements

a) Measuring instruments used for the transmission of quantity, such as flow meters, barometers, pressure gauges, vacuum gauges, thermometers, etc., shall be in accordance with the metrological verification rules the requirements of the process are periodically verified.

b) The ozone calibrator used for working standar...