Compared With 40 Tons of Hot Water Boilers, How Much More Expensive is Gas Than Coal?

 The 40 tons hot water boiler has three uses, one is central heating, the other is process hot water supply, and the last is heating water supply. Coal-fired 29MW hot water boilers are cheap, but not environmentally friendly; burning natural gas is environmentally friendly, but not cheap. Recently, a customer asked about the comparison of energy consumption between 40 tons gas fired hot water boilers and coal-fired hot water boilers

40 Tons Hot Water Boilers

Energy Consumption Comparison

1. 1 hour gas consumption of 40 tons gas hot water boiler

Calculation formula of gas consumption of gas boiler: gas consumption of gas boiler for 1 hour = gas boiler power * 3600s/fuel calorific value/thermal efficiency

We know that the conversion success rate of a 40-ton hot water boiler is 28MW, and 1 hour is equal to 3600s. The calorific value of natural gas is generally between 40.88MJ/M3-39.82MJ/M3, and we take an intermediate value of 37MJ/M3. The thermal efficiency of gas boilers produced by ZBG Group can reach 92%. Then insert the formula to get:

40 tons of gas-fired hot water boiler gas consumption per hour: 28MW*3600S/37MJ/92%=2961M3/h

If the natural gas is 3.8 yuan/cubic

1 hour fuel cost = 2961M3/hx3.8 yuan/cubic = 11251.8 yuan

2. 1 hour coal consumption of 40 tons coal-fired hot water boiler

Calculation formula for coal consumption of coal-fired boilers: boiler coal consumption per hour = boiler thermal power * 3600/coal combustion value/boiler efficiency

The thermal power of a 40-ton coal-fired boiler is 28MW. The calorific value of bituminous coal is generally between 27170 and 37200kj/kg. We take the median value of 22.3MJ/kg for calculation. The thermal efficiency of a 40-ton coal-fired boiler is about 82%. Formula: 28MW*3600/22.3MJ/82%=5512.4KG.

If it is calculated on the basis of 500 yuan/ton of coal, the fuel cost of a 40-ton coal-fired hot water boiler for one hour=5.5124KGx500=2756 yuan

As can be seen from the above, if you look at fuel costs, the cost of coal-fired boilers is much lower than that of gas-fired boilers. But this does not mean that gas boilers are bad. The thermal efficiency, environmental protection performance and operation of gas-fired boilers are better than coal-fired boilers. No matter which fuel boiler has its own advantages and disadvantages, enterprises should choose the boiler that suits them according to their actual situation.