Comparison of steam generator and steam boiler

Steam generator: A steam generator is a mechanical equipment that uses the heat energy of fuel or other energy sources to heat water into steam. Its volume must be less than 30L, and the volume ≥30L belongs to the category of boilers in the "Special Equipment Safety Supervision Regulations"; The water volume of the steam generator is less than 30L, so it is not supervised by the technical supervision department, which saves installation and use costs.

Steam boiler: A steam boiler refers to a boiler that heats water to certain parameters and produces high-temperature steam. The water is heated in the drum to become steam, and the fire emits heat in the furnace, which is the principle of the steam boiler. Steam boilers are special equipment. The design, processing, manufacturing, installation and use of boilers must be supervised by the technical supervision department. Users can only use the steam boiler with a boiler license.

1. Advantages and disadvantages of steam generator:

advantage:

1. The procedure is simple: the water volume of the steam generator must be less than 30L. Even if it explodes, the power produced is very limited. Therefore, the installation does not require notification, and the use does not require a license.

2. Steam production speed: due to the small water volume of the steam generator, from the operation of the equipment to the steam output, steam can be produced in a few minutes or a few tens of seconds.

shortcoming:

1. Poor operation stability: Due to the small water capacity of the steam generator, the ability to adjust load changes is poor. When the load changes beyond the generator's adjustment range, it is easy to cause the furnace body to overheat and shut down, or even damage the furnace body. Condition.

2. Water quality requirements: due to the small water capacity of the steam generator, the water is violently vaporized on the heating surface, so the water quality requirements are relatively high. If the water quality is not up to the standard, it is easy to cause scale deposition on the pipe wall, and it is difficult to clean. As a result, the thermal efficiency of the steam generator is reduced. Therefore, the steam generator is often used in conjunction with reverse osmosis water treatment.

3. Small capacity of a single unit: Due to the limitation of the water capacity of 30L, the evaporation capacity of a single steam generator cannot be very high, which requires multiple units in parallel.

4. Steam pipeline restriction: Although the steam generator does not need to apply for installation notification and use registration certificate, for steam pipelines with a nominal diameter of more than 50, the installation notification and use registration certificate are also required, and a qualified inspection unit is required to Inspect within the cycle.

5. Equipment life: Because the steam generator is not subject to national supervision and inspection, many users will neglect the maintenance of the product. The steam generator often runs in an unhealthy state, resulting in a shorter life of the steam generator.

Second, the advantages and disadvantages of steam boilers

advantage:

1. Large capacity of a single unit: The steam boiler can be set according to the needs of users, and there is no limit to the capacity of a single unit.

2. Stable steam production: Due to the large water volume of the steam boiler, the steam production is stable. At the same time, it has good adaptability to the adjustment of load changes.

3. Steam pipeline: When the total length of the connecting pipeline between the boiler and the heating equipment is less than or equal to 1000 meters, the boiler and the connected pipeline can be installed by the unit holding the boiler installation license, and the installation supervisor with the corresponding qualification The inspection agency implements the installation supervision and inspection together, and can go through the use registration together with the boiler, and no longer go through the use registration separately.

4. Long service life: Since the steam boiler needs annual inspection every year, this ensures that the user must carry out the necessary maintenance and maintenance of the equipment to increase the service life of the equipment.

5. Low water quality requirements: the steam boiler allows a certain amount of solid solution in the feed water, and the water quality only needs to meet the GB/R1576-2018 "Industrial Boiler Water Quality".

shortcoming

1. Apply for the use permit: because the steam boiler is a special equipment, the installation requires an installation notice, and the use requires a use registration certificate.

2. Slow steam production: Because of the large water volume of the steam boiler, the water in the whole boiler needs to be heated to a saturated water state when starting in cold state, so the steam production speed is slow when starting in cold state.

3. Conclusion

Based on the comparison between the steam generator and the steam boiler above, we can get the following conclusions. When the steam consumption is small and the load is stable, the nominal diameter of the steam pipe does not exceed 50mm (corresponding to the steam volume not more than 1 ton), it is recommended Use steam generator;

In the case of large steam demand, a steam boiler is recommended.