Maintenance points of lithium bromide absorption industrial chiller

1. Perform a gas tightness test on the lithium bromide unit. Vacuum degree is the first life of lithium bromide central air conditioner. If it does not reach high vacuum, it will increase the corrosion inside the machine and shorten the service life of the main engine. On the other hand, the cold water can not evaporate at low temperature, resulting in a decrease in cooling capacity and an increase in energy consumption. , thus affecting the normal operation of the unit. The test method is to charge 0.12 MPa of nitrogen into the machine cavity for leak test and test, and check the seal part, solution pump, refrigerant pump port, flange connection, weld seam, etc., if the leak is detected in time Replace or repair the leak. The inner cavity of the main unit is pumped to a high vacuum. If there is no change in atmospheric pressure or room temperature within 24 hours, the U-shaped vacuum gauge should be unchanged.

2. Regeneration treatment of lithium bromide unit solution: If the solution released in the machine is turbid and the color has changed from golden yellow to dark red, green or black, the impurities in the solution are removed by precipitation and filtration to make it clear and measure. The content and pH of lithium chromate, lithium hydroxide, etc., are adjusted to the required range, and the filtered solution should be stored in a sealed container. If the quality of the solution is unqualified, corrosion will occur in the machine, especially pitting, which will cause a large amount of corrosive deposits, and at the same time, hydrogen will be generated, causing a vicious cycle of the host vacuum and a decrease in the cooling output. Due to the precipitation of corrosives, the heat exchange performance of the solution heat exchanger decreases. Corrosive substances are suspended in the solution. When the solution circulates in the system, the host solution and the refrigerant water refilling device will be blocked, and the copper ions will also increase, causing copper coating. The bearing of the shielded pump is worn out and the shielded pump is damaged. The host with severe corrosion will also have refrigerant water pollution, the cooling output is seriously insufficient, and the main engine cannot operate normally. The increase of copper ions in the solution causes the physical properties of the solution to change, causing the performance of the host to decline.

3. The condenser, generator, absorber and evaporator of the lithium bromide unit are made of copper tubes. Due to the corrosion of harmful substances in the water, sediments and scales are generated, which seriously affects the effect of heat transfer and heat transfer. Use mechanical or chemical cleaning methods for maintenance.

4. Detect or replace consumables. Such as the graphite bearing of the shield pump, the sealing ring and diaphragm of the diaphragm valve, the valve plate of the vacuum pump, the removal and washing of the Y-type filter, and the garbage removal. If the Y-type filter is not removed and washed in time, it will cause garbage accumulation in the Y-type filter, block the pipeline, and the water flow is not smooth, which will affect the cooling or heating efficiency.

5. Action verification of the safety accessory device and measurement of the sensor's sensing performance. Mainly include: pressure gauges, wind pressure switches, temperature sensors, electromagnetic switches, relays, timers, etc. If the safety check and performance measurement of these safety accessory devices are not performed, the operator cannot determine various technical indicators, which will lead to a safety accident or fail to meet the functional requirements.

The above is the introduction of the main points of the maintenance of the lithium bromide industrial chiller, I hope to be helpful to everyone.