Gas Boiler Categories

Boilers fueled by gas can be categorized into natural gas boilers, city gas boilers, coking gas boilers, liquefied petroleum gas boilers, and biogas boilers, among others; by function, they include KS-Q gas water boilers, CLHS/CWNS gas hot water boilers (which cover gas heating boilers and gas bathing boilers), and LHS/WNS gas steam boilers, etc.; by structure, they are either vertical or horizontal gas boilers; and by flue gas flow, they are single-loop or triple-loop gas boilers. [1]

Features of Gas Boilers

1. Large font display of water temperature for easy monitoring of boiler and system operation; water temperature can be freely set from 10℃ to 90℃. The boiler automatically heats the system or provides hot water for domestic and bathing use.

2. The control system regulates the circulation pump based on the water temperature in the furnace. The hot water circulation pump starts when the water temperature reaches the set upper limit, and stops when it falls below the set lower limit.

3. The horizontal gas-fired hot water boiler features a three-pass full-wet back structure. It utilizes a large furnace and thick flue tubes to increase the radiation heat absorption in the furnace, effectively reducing energy consumption. The use of threaded flue tubes and corrugated furnace tubes significantly enhances heat transfer efficiency, greatly reducing fuel consumption.

4. The unit is equipped with overheat protection (the burner automatically stops and beeps an alarm when the water temperature inside the furnace exceeds the high limit), secondary overheat protection (the secondary circuit is automatically cut off when the boiler shell temperature exceeds 105℃), dry burn and low water protection (the boiler stops working and beeps an alarm when the water level is below the extremely low level), and electric leakage protection (the power supply is automatically cut off when the control system detects electrical leakage or a short circuit).

5. Boilers are designed with atmospheric pressure structure, ensuring they are in a pressure-free state with no safety hazards. They feature advanced multi-layered centrifugal glass wool insulation and are encased in high-quality, white color steel plates for external packaging, resulting in minimal heat loss and an aesthetically pleasing, rust-resistant appearance. [2]

Gas Boiler Maintenance

1. During operation, pay attention to the following points for gas boilers: (1) Gas boilers are not allowed to burn at positive pressure or have smoke in the furnace chamber, as it may easily damage the coal hole cover; (2) No water should accumulate on the bottom level of the gas boiler to prevent dampness and corrosion.

2. Gas boilers should be inspected once every 2-3 weeks during operation.

3. After every 3 to 6 months of operation, the gas boiler should be shut down for a comprehensive inspection and maintenance: (1) Inspect the interior and exterior of the gas boiler, including the welds in the pressure parts and the presence of corrosion on the inside and outside of the steel plates. Any serious defects found should be repaired immediately; if the defects are not severe, they can be addressed during the next shutdown. If any suspicious areas are found that do not affect safe production, a record should be made for future reference; (2) After the inspection, apply boiler bottom paint to the waterline to prevent corrosion.

4. Gas boilers and boiler bases should be painted at least once a year.

5. Maintenance Methods for Gas Boilers Not in Use for Extended Periods: There are two methods, dry and wet. For boilers not used for more than a month, dry maintenance should be employed. For those not used for less than a month, wet maintenance can be used.

(1) Dry Maintenance Method: After the boiler is shut down, drain the boiler water, thoroughly clean the internal dirt, and rinse it clean. Dry the firebox with a low flame (avoid using a high flame). Then, place blocks of unslaked lime, 10-30 mm in diameter, in separate trays inside the drum, ensuring they do not touch the metal. The weight of the unslaked lime should be calculated at 8 kg per cubic meter of drum volume. Close all manholes, handholes, and pipeline valves, and inspect them every three months. If the unslaked lime breaks down into a crumbly state, it should be replaced immediately. When the boiler is restarted, remove the unslaked lime and trays.

(2) Wet Storage Method: After the boiler is shut down, drain the boiler water, thoroughly clean the internal dirt, flush it clean, then refill it with treated water to the full, heat the boiler water to 100°C to expel gases from the water, close all valves, and do not use the moisture preservation method in cold climates to prevent the boiler water from freezing and damaging the boiler.