Guide: Steam boilers and hot water boilers have different uses, and are applicable to different industries and fields. When purchasing boilers, users should choose appropriate boilers and reasonable auxiliary equipment according to their actual uses. What is the difference between a steam boiler and a hot water boiler? What certificates are required for gas-fired steam boilers?
Steam boilers and hot water boilers have different uses, and are applicable to different industries and fields. When purchasing boilers, users should choose appropriate boilers and reasonable auxiliary equipment according to their actual uses. What is the difference between a steam boiler and a hot water boiler? What certificates are required for gas-fired steam boilers?
1. The difference between a steam boiler and a hot water boiler
1. Hot water as a heat medium is suitable for air conditioners, heaters, low-temperature ovens, drying equipment, hot water tanks for textile printing and dyeing, and various low-temperature heating, air-conditioning coils and heat exchange equipment, etc.;
Hot water heating medium generally speaking, the temperature of the heating medium is low, and the temperature difference with the flue gas is large, and the boiler exhaust gas temperature is relatively low, so the boiler efficiency is high;
Closed hot water system has a smaller make-up water, a much smaller blowdown rate than a steam boiler, and a smaller water waste. And the requirements for boiler water quality are low, and the water treatment cost is low;
The specific heat capacity of water is large, the hot water capacity in the system is large, and the heat storage capacity is strong. When the thermal operating condition or the hydraulic operating condition fails for a short time, it will not obviously cause large fluctuations in the heating condition;
The hot water boiler heating can be pumped for long-distance transmission, the heat energy loss is small, the heating radius is large, and it can meet the requirements of urban central heating planning;
The main disadvantages of using hot water as a heating medium for heating are lower temperature, lower heat transfer coefficient, and lower heat utilization rate;
2. At present, the boilers in our country are mainly steam boilers, and steam has many advantages as a heat medium.
low cost, wide adaptability, can meet the heat requirements of a variety of users with different pressure and temperature requirements at the same time;
non-toxic, can directly heat food, etc., even if there is dripping, it will not cause harm to the environment;
The steam temperature is relatively high, and the latent heat of vaporization is large. Compared with hot water, it can reduce the heat exchange area of the equipment and reduce the cost;
Thermal inertia is small, it heats up quickly when the steam is supplied, and cools quickly when the steam is stopped.
The steam heat medium is difficult to recover due to the condensed water, which causes a waste of latent heat and water resources. Even if there is a condensate water recovery device, in the process of condensate water recovery, because the water easily dissolves impurities such as oxygen, it is easy to cause harm to the boiler. Impurities such as oxygen and salt in the feed water will cause boiler fouling, corrosion and other problems, affecting the safety and energy saving of the boiler.
2. What certificates should be applied for gas-fired steam boilers
According to the corresponding boiler model, apply for the boiler use registration certificate before the boiler is put into use or within 30 days of put into use;
Boiler management personnel should hold special equipment management personnel certificate;
Boiler worker holds special equipment operator certificate;
Boiler conducts an external inspection every year;
Boiler undergoes an internal inspection every two years;
Boiler conducts water quality inspection once a year (generally conducted at the same time as the external inspection of the boiler);
The safety valve on the boiler is checked once a year;
Boiler pressure gauges are checked every 6 months;
Conduct boiler energy efficiency test at least once a year (not carried out in some areas);
Xinli gas-fired steam boilers and hot water boilers have a wide range of uses, and there are many user sites. If you need to inspect the site, you can contact the project manager in advance to communicate and investigate related matters.