Guide: Gas-fired boilers are known for environmental protection and energy saving. The boiler uses clean energy as fuel to achieve low emissions and efficient combustion. The higher the thermal efficiency of the boiler, the lower the fuel consumption and the more energy-saving. How to calculate the thermal efficiency of a gas-fired boiler? How much does a gas-fired steam boiler cost?
Gas-fired boilers are known for environmental protection and energy saving. The boiler uses clean energy as fuel to achieve low emissions and efficient combustion. The higher the thermal efficiency of the boiler, the lower the fuel consumption and the more energy-saving. How to calculate the thermal efficiency of a gas-fired boiler? How much does a gas-fired steam boiler cost?
1. Calculation method of thermal efficiency of gas boiler
There are many boiler manufacturers, different manufacturers, different boiler brands, boiler thermal efficiency is quite different. There are generally two calculation methods for the thermal efficiency of gas-fired boilers, namely, the positive balance method and the reverse balance method. The details are as follows:
1, positive balance method
The method of calculating the thermal efficiency by using the ratio of the heat used by the boiler to the total heat released by the fuel is called the positive balance method, also called the direct measurement method. The calculation formula of positive equilibrium thermal efficiency:
Thermal efficiency = effective use of heat / total heat that the fuel can release * 100% = boiler evaporation * (steam enthalpy-feed water enthalpy) / fuel consumption * fuel low calorific value * 100%
In the type, boiler evaporation capacity-actual measurement, kg/h;
It can be seen from the above thermal efficiency calculation formula that the positive balance test can only find the thermal efficiency of the boiler, but not the various heat losses. Therefore, through the positive balance test, only the boiler's evaporation capacity and thermal efficiency can be understood, the reason cannot be found, and the improvement measures cannot be proposed.
2, anti-balance method
The method of determining and calculating the heat loss of the boiler to obtain the thermal efficiency is called the inverse balance method, also called the indirect measurement method. This method is conducive to a comprehensive analysis of the boiler, to find out various factors that affect thermal efficiency, and to propose ways to improve thermal efficiency. Counter-balance thermal efficiency = 100%-the sum of the percentages of various heat losses
2. Cost of gas-fired steam boiler
The gas-fired steam boiler is a fully automatic and intelligent boiler. The boiler controller controls the operation of various auxiliary equipment and controls the parameters within the normal range. The cost of the boiler mainly includes the following points:
1. The most important cost of gas boiler is fuel cost, which accounts for about 90% of the total cost. According to the daily steam demand of steam boiler, the daily operating time of hot water boiler is converted into full-load operating time. The gas consumption of the tonnage boiler (calculated at 80 cubic meters per hour per ton of boiler) and the unit price of natural gas are sufficient.
2, the cost of electricity: the electric consumption of the boiler, the burner and the water supply (replenishment) pump) and the lighting, the electricity consumption during the running time, and the electricity cost
3. Water consumption of boiler (water bill)
4. Gas boiler maintenance fee
5. The labor cost is easy to calculate, and the staff salary
The thermal efficiency calculation method and gas consumption of gas boilers are introduced above. The use of gas boilers to save energy is very important. The first priority for users to choose gas boiler manufacturers is boiler energy saving, followed by boiler manufacturers. Users should choose carefully and choose the boiler and manufacturer that suits them. . Xinli Boiler focuses on the R&D and production of environmental protection boilers, and is good at designing and calculating the selection scheme of industrial boilers in various industries. Welcome to consult.