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Application of Flue Gas Analyzer in Daily Glass Plant

I. Significance of Measuring Flue Gas Content

In the daily glass industry, determining the composition of the kiln flue gas is of great significance, as the gas atmosphere in the kiln significantly affects the melting of various raw materials. By measuring the oxygen content in the kiln exhaust gas, we can grasp the combustion situation of the fuel, adjust the air-fuel ratio, and achieve energy conservation and consumption reduction.

II. Application of Flue Gas Analyzer in Our Company

In our company (Guangdong Huaxing), the instrument used for measuring exhaust gas oxygen content is the testo335 flue gas analyzer (Note: Model 335 was an early purchase by Huaxing; later purchases have been upgraded to models such as 340 and 350). It features simplicity and convenience. Our kiln is a vertical horseshoe flame pool kiln, using heavy oil as fuel, with a melting area of 98m2, a melting rate of 3.0, four oil guns on each side, direction change every 25 minutes, mainly producing bottles and jars in common white color. The specific fuel consumption is 90-100 kg of heavy oil per ton of molten glass. For common white color, the kiln atmosphere requires an oxidizing atmosphere, and the target for exhaust gas oxygen content is 2-4%, which is achieved through measurement and adjustment. We adjust the air-fuel ratio based on each measurement, where the air-fuel ratio is the numerical ratio of the combustion air flow to the heavy oil flow. This value varies due to the different characteristics of each kiln. In the initial stage of starting the exhaust gas oxygen content adjustment project, we measured once a week, adjusting the air-fuel ratio after each measurement until we found the optimal ratio. Now, the exhaust gas oxygen content is basically up to standard and stable, so our measurement frequency can be reduced to once a month.

III. Measurement Method

A. Preparation Stage

  1. Choose a suitable measurement point, usually on the side of the small furnace or the upper part of the heat storage room. We chose the latter.
  2. Prepare the tools, including the gas analyzer, asbestos gloves, cotton gloves, refractory cotton, iron hook, rubber hose, zirconia tube, and joints.
  3. Measurement should only be performed when the combustion of heavy oil is stable, and the control system should be switched from automatic to manual before measurement.

B. Measurement Stage

  1. Open the iron cover of the measurement hole in the heat storage room.
  2. Gently insert the zirconia tube into the measurement hole, penetrating the wall by 50mm, and block the gap with refractory cotton.
  3. Connect the gas analyzer and start the measurement, stop when the data is stable.
  4. Withdraw the zirconia tube and close the iron cover.
  5. Remove the instrument for data recording.
  6. Measure fresh air once, stop when the oxygen content reaches 20.50% or above, and wait for the next measurement.

C. Adjustment Stage

  1. Adjust the air-fuel ratio based on the measurement results.
  2. Observe the flame situation in the kiln to confirm the combustion effect.
IV. Prospects Analysis

In daily glass plants, besides measuring the oxygen content in kiln exhaust gas, the flue gas analyzer also plays a crucial role in measuring the gas composition in the feeding gas path, pre-mixing of liquefied gas and air, and other aspects. It can be said that the application scope of the flue gas analyzer is extensive, suitable for most industrial production scenarios, wherever there is gas, it can play a role.

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