System overview

In order to pollution area of effective supervision of enterprises, environmental protection departments at all levels have begun to use pollution sources on-line monitoring system, real-time monitoring of related enterprises, sewage, waste gas and noise emissions and environmental protection facilities operation etc.. The pollution sources of pollution through the online monitoring system of wide area network to the environmental protection departments, so that environmental protection departments centralized and real-time monitoring of sewage enterprises, effectively improve the supervision efficiency and effectiveness, greatly enhance the management level of intelligence.

A complete source of pollution on-line monitoring system consists of two parts, one is the software running on the monitoring platform of the environmental protection department, this platform can receive the on-site data, save and display the real-time emission data of each enterprise, have exceed the standard basic functions of alarm, statistics and reports etc.. The second is to install the relevant monitoring instruments and collection of communication equipment in the sewage outfall of each enterprise, these instruments and equipment automatically measure and collect the pollutant data, and report the data to the pollution source on-line monitoring platform.

system requirements

First of all, whether sewage or waste gas or noise, monitoring instruments and collection communication equipment need on-site installation in the discharge of these places, because of the bad environment, the equipment requirements are very high, so the equipment must be industrial grade, and has certain protection ability.

Secondly, the acquisition accuracy and acquisition ability can meet the requirements, and has a variety of means of communication, to meet the requirements of the data can be reported under different conditions.

Again, the stability and reliability of the equipment is better, in order to minimize maintenance costs.

Finally, the data acquisition should meet the latest standard "HJ477-2009 pollution source online automatic monitoring (monitoring) data acquisition and transmission instrument", and has the relevant certification.

System constitution

A typical sewage outfall, often need to monitor the following parameters: flow value, pH value, COD, ammonia nitrogen, a variety of heavy metals, such as nickel, lead, mercury, copper, etc.. Therefore need to configure the sewage monitoring meter, pH meter, COD on-line monitoring, on-line process monitor and a variety of heavy metals on-line monitoring and analysis instrument, data acquisition, data collector must have a variety of data acquisition methods, can effectively manage these analytical instruments, summary obtained from analysis instrument data, and the data will be automatically reported to the environmental protection department of the sources of pollution online monitoring platform.

The general collection of the exhaust gas: gas flow rate, concentration and the content of hydrogen sulfide, carbon dioxide, ammonia, sulfur dioxide and other pollutants. The commonly used method is to install a set of CEMS flue gas continuous online monitoring system and a data acquisition device. The data were analyzed by the on-line monitoring system, and the data collector was responsible for collecting and reporting the pollutant data.

Due to the wide range of geographical distribution of pollution sources, and scattered, the data can only be used in the field of remote communication to achieve automatic reporting. Commonly used communication modes are public and private networks, cable networks and wireless networks. The public refers to the public Internet network online monitoring system of pollution sources connected to the public network, the data collector can enter the public network through wired or wireless means, and access monitoring platform, data report monitoring platform. Private network refers to the VPN virtual local area network or VPDN virtual dial-up network, which is isolated from the public network, and relatively closed and independent, thus providing a relatively high system security. The monitoring platform and data acquisition are in the same virtual network, communicate with each other. At present, the most widely used traffic way with Ethernet, ADSL dial-up network, GPRS/CDMA wireless communication mode, of course there are some other means of communication is optional, such as the SMS SMS and PSTN telephone dial-up network, 3G wireless network, optical network, satellite communication network etc..

system configuration

MS-DAT-2001 environmental data acquisition, to meet the requirements of the "HJ477-2009" collector, has access to environmental protection product certification. MS-DAT-2001 supports the "HJ/T212-2005" communication protocol to support a variety of common remote communication. MS-DAT-2001 is equipped with sufficient data acquisition capabilities, technical requirements and performance indicators to meet and exceed the requirements of the relevant standards.

Built in GPRS communication module, optional CDMA, support multi center

Built in Ethernet interface, support multi center, can work with GPRS at the same time

6 road with isolated RS-232 interface, built-in more than 100 kinds of environmental monitoring instrument agreement

1 road with isolated RS-485 interface, built-in more than 100 kinds of environmental monitoring instrument agreement

8 high precision analog input channel, support 0-5V and 4-20mA

8 channels with isolated switch input channels

320 X 240 dot matrix LCD, with touch keys

Built in memory can save a year of historical data, power loss is not lost

2 relay output

Built in rechargeable lithium battery, life is 8 hours

The whole machine is IP65 protection grade

Select industrial grade components, high reliability, high stability

Device code (Firmware) can be upgraded remotely

Support HJ/T212-2005 communication protocol

Support third party communication protocol

System diagram

The MS-DAT-2001 environmental data collector used in a thermal power plant as an example, the thermal power plant has a total of 4 flue gas discharge port, each discharge port installed a set of CEMS flue gas continuous on-line monitoring system and a MS-DAT-2001 data collector. CEMS through the RS-232 communication interface to connect to the MS-DAT-2001 data collector COM1. CEMS collected the following parameters: flue gas flow, flue gas pressure, carbon monoxide, nitrogen oxides, carbon dioxide, sulfur dioxide, oxygen content, water content. At the same time MS-DAT-2001 communication monitoring platform and the environmental protection department of the pollution sources on-line monitoring platform and system operators, so that operators can keep abreast of the field data and equipment status, for the normal operation of the system and provide an effective means of timely maintenance.