Hongrun Instrument is applied to the solution of pollution source online automatic monitoring system

Abstract: The online monitoring system for pollution sources is an information platform for environmental monitoring and environmental warning. The system uses advanced wireless networks, covering online monitoring of water quality, automatic monitoring of flue gas, air quality monitoring, environmental noise monitoring and video monitoring. Meet the environmental information construction requirements of environmental protection departments at all levels, support the environmental supervision and environmental monitoring of environmental protection departments at all levels, and meet the management needs of users at different levels.

Keywords: pollution source online automatic monitoring real-time database Hongrun

1 Overview

With the development of industrial production, the environment on which human beings depend for survival is facing unprecedented challenges. The gaseous pollutants such as sulfur oxides and nitrogen oxides that are emitted into the air during production cause the air we breathe to become increasingly turbid; industrial sewage A large number of arbitrary emissions, water resources are seriously polluted; urban noise pollution is increasingly serious, which has caused great harm to human health and ecological environment. "Protecting the environment and purifying the earth" has become a top priority that needs to be solved urgently. It is a matter of great concern to future generations.

2. Design of online automatic monitoring system for pollution sources

2.1. Introduction to program design

The online monitoring system for pollution sources is an information platform for environmental monitoring and environmental warning. The system adopts advanced wireless network, covering various environmental online monitoring applications such as water quality monitoring, automatic flue gas monitoring, air quality monitoring, environmental noise monitoring and video monitoring. The system is based on online monitoring of pollution sources and fully implements total management and total amount. The principle of control includes many important functions of the environmental supervision information system, fully meets the construction requirements of environmental information networks of environmental protection departments at all levels, and supports the environmental supervision and environmental monitoring of environmental protection departments at all levels to meet the management needs of users at different levels.

The online automatic monitoring system for pollution sources can be divided into three levels: pollution source site monitoring station, transmission network and environmental protection bureau central station.

1) The on-site monitoring station is located at each pollution source site monitoring point, and can be divided into three parts: field instrument, field communication network, and data acquisition and transmission server.

2) The transmission network is responsible for transmitting the data of the pollution source on-site monitoring station to the central station of the Environmental Protection Agency. Divided into two levels: the basic transport layer and the application layer.

3) The central station of the Environmental Protection Bureau communicates with each other through the network transmission layer and the field layer, exchanges data and commands, and realizes centralized remote monitoring of the field layer.

3. On-site monitoring station

The on-site communication network is responsible for summarizing the data collected by the instrument to the data collection and transmission server. Standard RS232/485 electrical interface supports Modbus communication protocol. The data collection and transmission server is responsible for summarizing, analyzing, storing and responsible for real-time data exchange with the host computer.

3.1 On-site monitoring station instrument:

The secondary instrument adopts the full range of NHR instruments independently developed by Hongrun, including:

NHR-5100A temperature display controller;

NHR-1100A liquid level display instrument;

NHR-5310 regulator;

NHR-5600 flow totalizer;

NHR-5800 flash alarm

One instrument includes:

HR-WZP thermal resistance;

HR-LUGB vortex flowmeter;

HR-3051 pressure / differential pressure transmitter;

HR-FZ float level gauge;

Hongrun electric/pneumatic control valve;

3.2 Instrument parameter setting:

NHR-5100 temperature display:

Parameter symbol name setting range (word) Description setting value

Pn Pn Input index number 0 to 35 Set the input index number type (see Table 1) 14 (Thermal resistance)

Addr Addr Device No. 0 to 250 Set the device code of the instrument when communicating.

bAud Baud communication baud rate Baud=0 communication baud rate is 1200bps 3

Baud=1 communication baud rate is 2400bps

Baud=2 communication baud rate is 4800bps

Baud=3 communication baud rate is 9600bps

PL PL measurement range lower limit full scale setting input signal lower limit range - 199.0

PH PH measurement range upper limit full scale setting input signal measurement upper limit range 650.0

NHR-1100 liquid level display:

Parameter symbol name setting range (word) description setting value

PnPn input index number 0~35 set input index number type (see Table 1) 14 (thermal resistance)

AddrAddr device number 0 to 250 sets the device code of the instrument when communicating.

bAudBaud communication baud rate Baud=0 communication baud rate is 1200bps3

Baud=1 communication baud rate is 2400bps

Baud=2 communication baud rate is 4800bps

Baud=3 communication baud rate is 9600bps

PLPL measurement range lower limit full range setting input signal lower limit range - 199.0

PHPH measurement range upper limit full range setting input signal measurement upper limit range 650.0

NHR-5310 regulator:

PP proportional band full scale proportional band 50.0

II integration time 1 to 9999 (×0.5S) integration time

Residual deviation caused by the release of proportional control

When set to 9999, the integral does not work 10

Dd differential time 0~1999 (×0.5S) differential time

Predict changes in output, prevent disturbances, and improve control stability

When set to 0, the differential does not work.

T0T0 operation cycle 1 to 200 (×0.5S) PID adjustment operation cycle 1

T1T1 output cycle 1 to 200 (×0.5S)

Accuracy: 10mS control output cycle

(This parameter is available for relay or thyristor output) 1

AutAut auto-tuning Aut=0-off

Aut=1-switch - manually set the PID parameter value

On-automatic calculation (self-tuning)

Note: After the automatic calculation is completed, the PID parameter can be manually modified.

NHR-5600 flow totalizer

Parameter setting range parameter setting range

Temperature compensation range lower limit full scale

Temperature compensation range upper limit full scale

Pressure compensation range lower limit full scale

Pressure compensation range upper limit full scale

Flow input range lower limit full scale

Flow input range upper limit full scale

Flow input small signal cut off full scale

Flow coefficient 10～999999

Working condition density 0～999999

3.3 On-site monitoring station system network:

On-site instrument, the collected temperature, liquid level and flow signal are transmitted to the secondary instrument. All the Hongrun secondary instruments adopt the standard MODBUS RTU protocol, and the data acquisition is performed with the workstation IPC through the function code + register address. Control, because the Hongrun secondary instrument adopts 485 transmission, it is necessary to install 485/232 converter between the instrument and the workstation industrial computer. The communication distance of 485 is up to 1200m, and the communication distance can be extended by adding loop resistance and relay module. .

4. Transmission network construction

Due to the scattered distribution of monitoring points and wide distribution, and most of them are located in the harsh environment, this scheme uses GPRS wireless network for wireless data transmission. The pollution monitoring equipment will send the collected pollution data and alarm information to the environmental protection supervision department in time through the GPRS network, which can realize the timely management of the pollutant discharge unit or individual, greatly improve the work efficiency and provide a new way for environmental protection.

5. Environmental Protection Bureau Central Station

The EPA Central Station consists of the Hongrun enterprise-level real-time database, relational database, Web server and client software that implements various query and analysis functions. The client adopts the CAREER6.0 platform of Hongrun Technology to comprehensively monitor the pollutant discharge status of the enterprise and transmit the real-time image of the enterprise site to the Environmental Protection Bureau.

â—† Real-time monitoring and management

Realizing the visual management of pollution sources has realized a comprehensive, real-time and networked monitoring system for pollution sources. Simply look at the icon styles or colors of the various companies on the screen to see how all the equipment in each of the company's pollutant discharges is operating. You can also view detailed monitoring data on corporate pollutant emissions through tables and curves. This allows the staff to view the equipment operating status, pollutant emission concentration, flow rate, emissions and other information of all the sewage outlets of all enterprises in the same user interface.

â—† Powerful alarm and warning function

Provides a variety of alarm functions in the form of sound, light color changes, color values ​​in the table, and more. Accurately giving specific over-standard values, exceeding the standard time, exceeding the standard discharge amount and exceeding the standard discharge medium volume, provides a detailed and reliable basis for strengthening the supervision work.

â—†Statistics and analysis of data

The on-line monitoring data and alarm information of pollution sources are subjected to comprehensive and multi-angle classification and statistical analysis to fully meet various statistical requirements. The information on the operation status, pollutant emission concentration, flow rate, and discharge amount of each sewage outlet device, as well as the development trend and dynamics of the pollutant discharge port, are displayed in real time in various forms such as icons, tables, and graphs. Statistical analysis of monitoring data from a variety of perspectives and levels, providing comprehensive reports and statistical charts. Statistical analysis reports and statistical charts can be generated according to various classification methods such as jurisdiction, industry type, and pollutant type.

â—† Seamless integration with GIS

The system integrates the geographic information system, uses its powerful geographic information analysis function, and combines the environmental mathematical model to realize the functions of data query, statistics, environmental mapping and display based on geographic information, as well as pollution source analysis, regional environmental assessment and early warning. Emergency, environmental decision management, etc.

â—†System Management

The main functions of system management are: user account management, monitoring element management, pollution industry management, monitoring instrument management, monitoring task management and so on.

In order to ensure the security of the system data, the system will make a detailed distinction between the user's rights. First, the user has a basic authority according to its administrative level. For example, the city-level users can query the pollution situation of the polluting enterprises in the city, and the town-level users. You can check the pollution situation of polluting enterprises within its jurisdiction. On this basis, each user gets the corresponding usage rights according to the nature of their work. For example, read-only permission will allow the user to only find information and not modify the data, and the editing permission will allow the user to administer it. The company's information has all the rights to modify.

6. Summary

Introduce information technology such as automatic control, network communication, computer and geographic information system into the field of environmental monitoring, and use the domestic advanced monitoring configuration software Hongrun CAREER6.0 and Hongrun real-time database products to establish online monitoring systems for environmental elements including pollution sources. To achieve continuous real-time monitoring of key pollution sources, to dynamically control the discharge and over-standard conditions of key pollution source enterprises, to strengthen the supervision of key polluting enterprises, watershed pollutant discharge, total amount control, prevent the occurrence of major pollution accidents, and improve China's environmental monitoring information. The level of chemistry and environmental decision-making and management capabilities are of great significance.