In 2004, Xinji City in Hebei Province initiated the construction of a new type of biogas digester. Since then, over 20,000 digesters have been installed across the region. While the operation of these digesters has now become routine, some challenges remain, particularly in the use of biogas lamps and desulfurizers. To help users maintain safe and efficient usage, this article provides detailed guidance on the installation, operation, and troubleshooting of biogas lamps, as well as common issues and solutions related to desulfurizers.
**Installation and Use of Biogas Lamps and Troubleshooting**
**1. Installation and Operation of Biogas Lamps**
Before using a new biogas lamp, it is important to perform a ventilation test with the gauze cover in place. If the flame appears light blue, stable, and produces a loud hissing sound, it indicates proper function. At this point, the gas valve should be closed, and the shroud should be placed once the mud has cooled down.
When installing the gauze cover, make sure it is securely fastened into the mud slot. Wrap the asbestos line around the gauze at least twice, tie a knot, and trim any excess threads. Then, smooth out the gauze to ensure even distribution.
For the first ignition of a new gauze, a higher pressure is needed initially to allow the gauze to form a spherical shape. When lighting again, gradually increase the pressure to avoid damaging the gauze.
After burning, the man-made fibers will turn into a white silica grid. Since thorium dioxide is toxic, never touch the burned gauze directly or hit it with other objects.
**2. Common Issues and Solutions for Biogas Lamps**
- If a blue flame appears on the outer layer of the gauze and doesn't disappear, it may indicate insufficient air intake. Rotate the lamp pan clockwise to increase airflow.
- If the gauze turns red instead of white, it could mean too little gas or too much air. Adjust the lamp counterclockwise to reduce air intake until the flame turns white and bright.
- If the lamp fails to light or flickers, check the nozzle for blockage. Remove the nozzle and puncture it with a small needle. If the light fluctuates, there may be water in the pipeline; open the condensate trap to drain it.
- If the flame burns well but isn’t white, it may be due to poor-quality gauze or excessive moisture. Replace the gauze with a high-quality one.
**Common Desulfurizer Failures and Precautions**
**1. Common Causes of Desulfurizer Failure**
The most frequent issue with desulfurizers is overheating, often caused by:
- Large-scale material discharge from the digester while users are cooking, allowing air to enter the system and cause a reduction reaction, leading to overheating.
- Opening the movable cover during high gas production, which allows air to enter the digester. Even after resealing, residual air can reach the desulfurizer, causing a similar reaction.
**2. Usage Precautions for Desulfurizers**
- Avoid discharging gas when using lamps or stoves.
- When discharging large amounts of material, close the main gas valve and the purifier switch.
- If the movable cover opens due to high gas production, regenerating or replacing the desulfurizer is necessary.
**Desulfurization Agent Regeneration Method**
1. Turn off the outdoor main switch and the purifier control switch.
2. Open the desulfurization bottle and let the agent air out for 10 minutes.
3. Place the desulfurizer in a cool, well-ventilated area—never expose it to sunlight.
4. After removing the agent, place it on a concrete floor or iron plate, not on plastic or flammable materials.
5. Allow the desulfurizer to regenerate for at least 24 hours.
6. Do not return the powder to the bottle if only particles remain, as it could clog the stove’s nozzle. Add new desulfurizer to replace what was removed.
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