Product description

Zirconia oxygen analyzer has the characteristics of high sensitivity, good reproducibility and stability, wide range, automatic switching, fast response and continuous online measurement, and can be used with various display instruments, recorders and DCS distributed control system. The oxygen content of the flue gas produced by the boiler, kiln, heating furnace, incinerator and other combustion equipment in the combustion process can be quickly and accurately displayed online, detected and analyzed, in order to achieve low oxygen combustion control, to achieve energy saving and consumption reduction, reduce operating costs, reduce environmental pollution. Can be widely used in metallurgy, thermal power, electric power, petroleum, chemical industry, glass, building materials, boiler, kiln, aluminum, thermal power plant, power plant, textile, food, ceramics and other industries, is the process control, product testing ideal oxygen content analysis equipment.

Working principle

The zirconia oxygen analyzer is converted from the electrodynamic force of oxygen concentration difference to the standard voltage signal which is linearly related to the oxygen content of the measured gas through the detection instrument, and then input to the input terminal of the digital instrument and input to the CPU of the instrument through A/D conversion. After calculation, All the way to the instrument to display oxygen content, all the way to the instrument to display temperature value, and output the corresponding pulse control signal to control the temperature value, at the same time the oxygen content into 4-20mA analog signal to be output for other control systems. Instrument is equipped with oxygen content, temperature alarm indicator, and attached with external alarm relay. The instrument adopts reliable switching power supply, cold end compensation adopts three-wire Pt100, low drift operation amplifier, high resolution A/D conversion, LED high brightness digital display/LCD display, PID temperature self-tuning control, with 4-20mA signal output, and self-heating constant temperature function.

Why oxygen content monitoring

With the gradual improvement of people's awareness of environmental protection and energy saving, many large and medium-sized enterprises such as iron and steel metallurgy, petrochemical, thermal power plants, etc., have to improve combustion efficiency, reduce energy consumption, reduce pollutant emissions, environmental protection as an important way to improve product quality and enhance product competitiveness. Combustion devices and thermal equipment such as steel rolling heating furnaces in the steel industry and boilers in the electric power industry are major energy consumers in all industries. Therefore, how to measure and improve the combustion efficiency of the combustion device and determine the standard combustion point is very concerned.

Determine the standard combustion efficiency point

Not all the fuel combustion heat that supplies furnaces, boilers and other heating equipment is used. Take the rolling furnace or boiler for example, the effective heat is the heat that must be introduced in order to heat or melt the material (and the process), and the physical heat taken away by the furnace flue gas is the main part of the heat loss. When the blast volume is too large (that is, the air-fuel ratio α is too large), although the fuel can be fully burned, the amount of excess air in the flue gas is too large, which is manifested as the high O2 content in the flue gas, the heat loss of excess air away Q1 increases, resulting in the low thermal efficiency η. At the same time, excessive oxygen will react with S in fuel and N2 in flue gas to produce SO2, NOX and other harmful substances. As for the rolling furnace, the high oxygen content in the flue gas will lead to the thickening of the billet oxide sheet and increase the oxidation burning. When the blast volume is low (that is, the air-fuel ratio α decreases), the O2 content in the flue gas is low, the CO content is high, although the exhaust heat loss is small, but the fuel is not completely burned, the heat loss Q2 increases, the thermal efficiency will be reduced. In addition, the chimney will give off black smoke and pollute the environment. The so-called improve combustion efficiency, is to the right amount of fuel and the right amount of air composition of a better proportion of combustion. Thermal efficiency is related to the content of CO, O2, CO2 in flue gas, exhaust temperature, heating load, atomization conditions and other factors. Therefore, by measuring and controlling the content of CO, O2, CO2 in the flue gas to adjust the air consumption coefficient λ, to achieve the highest combustion efficiency. Combustion efficiency control has a long history. In the 1960s of last century, CO2 analyzer was widely used to monitor the CO2 content in the flue gas to control the air consumption coefficient λ in order to achieve good Midas, but the CO2 content was greatly affected by the fuel variety. After 70's, gradually using the flue gas O2 content or O2 content and CO content combined method to control the combustion efficiency. The most direct way to improve combustion efficiency is to use flue gas analysis instruments (such as flue gas analyzer, combustion efficiency tester, zirconia oxygen content detector) to continuously monitor the composition of flue gas, analyze the content of O2 and CO in the flue gas, adjust the flow of combustion-supporting air and fuel, and determine the better air consumption coefficient.

Functional characteristics

1: zirconia oxygen analyzer is divided into zirconia probe and oxygen transmitter two parts.

2: The probe is made of anticorrosive alloy material, zirconia disassembly and exchange is convenient, without additional air pump, reference gas convection, and is provided with a standard gas interface, background and preset standard gas test. Protective casing can also be added according to user requirements.

3: The instrument software has complete functions, all panel operation, simple wiring, circuit integration, reliable performance, convenient debugging, table machine performance is the leading level in China.

Technical parameters:

1. Measuring range: 0 ~ 20.6%O2

2, instrument accuracy :≤0.5%F.S

3, temperature display range: 0~1300℃

4: Measuring temperature: 0~600℃(low temperature type), 0~800℃(medium temperature type), 0~1300℃(high temperature type)

5: Background correction: -20mV ~ +20mV

6: Environmental conditions: 0 ~ 50℃, relative humidity < 90%

7: Power supply: 220VAC 50Hz

8: heating temperature: PID self-tuning control ≤±1℃(arbitrary setting of constant temperature point)

9: Response time: about 3S (90% response)

10: Display form: liquid crystal display

11: Output: 4-20 mA

12: Sensor using Japanese ion coating technology, greatly improve the service life

13: working condition online calibration: accurate and reliable, single standard gas online calibration is convenient, working condition point can be directly calibrated, accurate measurement

14: thermal inert protection: easy installation, hot installation, strong adaptability to stop and start furnace

15: multifunctional display: oxygen content (%); Oxygen potential; Temperature, background potential parameter digital display intuitive and convenient

16: background potential adjustable, wide adjustment range, can be checked at any time the aging components and other parameters

17: Product serialization adaptability: can be applied to gas, fuel oil, coal furnace types.