Introduction to technical characteristics of zero blowdown of industrial boilers

1. Overview

zero blowdown steam generation technology is a complete set of water-saving technology for industrial boilers, and it is also a new boiler water treatment technology. Boiler is the source of thermal energy for industrial production and human life, and it occupies an important position in the national economy. It is well-known as the heart of industry. The working medium of the boiler is water, and boiler water treatment is an important link to ensure the safe and economic operation of the boiler. A boiler is a heat exchange device that transfers the energy generated by the combustion of external energy sources (coal, oil, and natural gas) to the working medium, turning water into steam. Poor water quality contains more harmful impurities. If this water enters the boiler without any treatment, the impurities in the water will form scale or slag in the boiler. The formation of scale will greatly reduce the thermal conductivity of the boiler and cause the boiler Fouling will cause overheating and damage to the furnace tube, increased fuel consumption, reduced output, shortened boiler life, and even accidents. Therefore, the treatment of boiler feed water is very important.

2. Working principle

1. Traditional industrial boiler operation mode

Operating characteristics of traditional industrial boilers:

  1. Use ion exchange equipment to soften the raw water to prevent boiler scaling.
    In the process of boiler feed water treatment, the popularity of ion exchange in my country’s boiler rooms has reached more than 90%. When the raw water passes through the sodium ion exchange resin bed, the calcium and magnesium ions in the water are exchanged with the harmless ions on the resin, thereby removing the calcium and magnesium ions from the raw water, and the residual hardness can be reduced to below 0.05mol/L. For raw water with high alkalinity, softening and alkali reduction treatment is also required. For water treatment by ion exchange method, regenerated waste liquid must be discharged, and the regenerated waste salt water can lead to salinization of fresh water. In this link, the discharged waste water accounts for about 5-15% of the original water.
  2. Use thermal deaerator to remove oxygen to prevent boiler oxygen corrosion.
  3. During the operation of industrial boilers, due to the high concentration of water, the dissolved solids and suspended solids in the water increase. In order to ensure the quality of steam and ensure the safety of the boiler, the boiler must carry out necessary continuous blowdown and regular blowdown. The blowdown of this link accounts for about 5-10% of the boiler make-up water.
  4. In the steam application link, the traditional operation mode only pays attention to the utilization of heat energy and neglects the recovery of energetic media. The steam becomes hot water after it is condensed by work. The quality of the condensed water with high calorific value is much higher than that of softened water and close to pure water. However, since the condensed water will severely corrode the steel pipes during the recovery process, corrosion products such as iron will cause serious pollution to the water quality. When the untreated condensate is used as boiler supplementary water, the large amount of iron ions contained in the water will cause secondary scaling and under-scaling corrosion on the heat transfer surface of the boiler, causing greater harm and making the recovery and utilization of steam condensate to a certain extent Difficulty. In the past, many industrial boilers did not consider the recycling of condensed water in the design and installation of the system and steam-using equipment, and the steam condensed water was discharged to the trench and wasted. Although some users recycle condensate as boiler feed water, due to the lack of effective pipeline anti-corrosion measures and condensate treatment technology, the condensate recovery pipeline is corroded seriously, and the high iron ion content in the condensate directly affects the safe operation of the boiler. At present, the recovery rate of industrial boiler condensate is less than 20%.

2. Zero blowdown steam generation technology for industrial boilers

zero blowdown steam generation technology is a complete set of industrial steam boiler water saving technology. This technology uses chemical methods and adopts a comprehensive system design design to eliminate pollution from the source of steam generation, eliminate or reduce ion exchange regeneration waste brine, dissolved salt wastewater, backwash water, flushing water, continuous sewage, regular sewage and Discharge of polluted condensate, etc.: Inhibit metal corrosion of condensate recovery system pipelines, eliminate iron ions pollution to condensate water, and realize that high-calorific value and high-quality condensate can be recycled to the boiler as boiler water supplement, which can significantly reduce boiler fuel consumption Reduce the amount of softened water, reduce steam production costs, and improve boiler water quality. Due to the improvement of boiler water quality, it can also greatly reduce boiler blowdown and heat loss caused by blowdown, improve boiler efficiency, and make boiler operation safer.

zero blowdown steam generation technology changes the operation mode of the boiler steam generation system from large blowdown operation (open loop operation) to closed loop (closed loop) operation. This technology has changed the traditional mode that the boiler must operate under a large number of sewage conditions, and is a major breakthrough in boiler water treatment technology.

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