What is the maximum thermal efficiency of a coal fired heating boiler?

90~99%。

The thermal efficiency of a boiler is the percentage of effective heat in the heat fed into the fuel. The thermal efficiency of coal-fired boilers is 70 85%, and the thermal efficiency of oil-burned, gas-fired and electric boilers is 90-99%. Improving the thermal efficiency of the boiler is to increase the effective use of heat and reduce the heat loss of the boiler, of which the focus is to reduce the heat loss of boiler exhaust gas and the loss of incomplete mechanical combustion.

That is, under the condition that the boiler has a thermal efficiency of 96% in energy conversion, the burner can produce 600,000 kcal-hours of heat by burning standard cubic meters of natural gas, which can meet the operating needs of 1 ton of boiler. The higher the thermal efficiency of the boiler, the lower the gas consumption.

The regulations for the supervision and management of boiler energy-saving technology stipulate that the thermal efficiency of natural gas boilers is 92.

Basis: Boiler Energy Saving Technical Supervision and Management Regulations (TSG G0002-2010) No. 1 Amendment Order.

A2 Thermal efficiency index of liquid fuel, natural gas-fired industrial boiler products under rated working conditions, liquid fuel, natural gas-fired industrial boiler products under rated working conditions of thermal efficiency target values and limit value requirements are shown in Table A-4.

Table A-4 Target and Limit Values of Thermal Efficiency under Rated Operating Conditions for Liquid Fuel and Natural Gas Fired Boiler Products.

Fuel variety: natural gas.

Boiler thermal efficiency ( ).

Target: 98

Limit: 92

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Let's take a new house of 100 square meters with two bedrooms and one living room as an example to calculate the electricity consumption of electric boiler heating.

Calculation of electricity consumption for electric boiler heating.

Based on the average family room equipped with a power of 100 watts, the total electrical power is about 10kw. A day is 24 hours, but the electric boiler heating does not need to be turned on all the time, the actual daily electricity consumption time is about 4 5 hours, we take the actual power consumption of 5 hours to calculate, then the daily electricity consumption is 50 degrees. The monthly power consumption is 1500 kWh.

Electric boiler heating can make full use of the peak-to-valley electricity price policy, and the peak-to-valley electricity prices in Liaoning are: peak electricity 8:00-22:

00, electricity price yuan; Valley electricity 22:00-8:00, electricity price.

When using electric boilers for heating, you can adjust the temperature of valley electricity at night, such as 60 degrees, and lower the temperature during peak electricity during the day, such as 40 degrees. In this way, the indoor floor heating or radiator can flexibly use the valley power time at night to store heat, and then release the heat during the day.

However, if the room is well insulated, it will save money. Let's calculate the actual monthly electricity consumption cost of using electric boilers for heating as follows:

Ordinary electricity tariff monthly electricity bill.

Daily electricity cost = (5 hours x 10 kWh) yuan Hourly electricity cost = 25 yuan Monthly electricity cost = 30 days x 25 yuan = 750 yuan.

Enforce peak-to-valley electricity prices or save energy through behavior.

In this way, a winter is about 3,000 yuan for 4 months. Perhaps most people will think that this power consumption is very large. Yes, the electricity consumption of electric boiler heating is indeed very large compared with the electricity consumption of the electrical appliances we usually use.

However, more than 3,000 yuan is the winter heating cost of the whole year, compared with the use of coal boiler heating, it requires a lot of manpower and material resources, and it is polluting to the environment, electric boiler heating is green, environmentally friendly, healthy, energy-saving, pollution-free, fast, efficient and convenient to use, and has a life span of more than 20 years! It is not as troublesome as coal boilers, and there is no need for regular maintenance in the later stage, and a one-time investment will benefit you for life. In fact, for families in areas without central heating, if there is a fire pit at home, only one or two bedrooms are installed, the actual electricity bill for the whole heating season is about 1,000 yuan, which is very economical.

Electric boiler heating is heated by water circulation, and the room still retains enough humidity while the product is running, which is environmentally friendly, healthy and energy-saving, and is recognized as the most comfortable and healthy heating product among many known heating methods.

<><1. What is the thermal efficiency of a gas boiler?

The thermal efficiency of the gas boiler is 90% to 99%, that is, the proportion of the effective heat of the fuel, the higher the thermal efficiency of the boiler, the lower the gas consumption, and the lower the shed rent and the heat loss of boiler exhaust gas and incomplete combustion. Calculation of boiler thermal efficiency, taking a 1-ton boiler as an example, if the boiler produces 600,000 kcal per hour and the calorific value of natural gas per hour is 8,600 kcal, the boiler thermal efficiency is 60 divided by 8,600 and divided by 100%. Illustrate the thermal efficiency of the boiler as:

2. What are the advantages of gas boilers:

1. Clean and environmentally friendly.

The main component of natural gas is alkanes, which are colorless, odorless and non-toxic, and only carbon dioxide and water will be produced when burned. Unlike coal combustion, which will produce harmful substances such as dust and sulfur, and after natural gas is burned, there is less dust in the flue gas, which meets the national requirements for gas equipment and reduces environmental pollution.

2. Low investment cost.

If the coal boiler wants to meet the environmental protection standards when it is used, it needs to be equipped with many equipment, such as soot blowers, dust collectors and slag removal, etc., and the investment cost of fuel distribution is high. The gas boiler does not need to be equipped with the above auxiliary equipment, only a condenser and an economizer are needed to meet the sewage discharge requirements, and the investment cost is low. The gas boiler does not need to be equipped with the above auxiliary equipment, only the condenser + energy saver can complete the ultra-low air pollutant emission requirements, which greatly reduces the investment cost of the boiler.

3. Small footprint.

The use of coal-fired boilers requires a large space to stock up on coal resources, while the use of gas-fired boilers only requires the burial of pipes, without the need to increase storage space, and does not require gas-fired processing equipment, so it is simpler.

4. High thermal efficiency.

The gas boiler uses natural gas, plus condenser and economizer and other equipment, which reduces the emission of harmful substances by 99%, and the thermal efficiency is 20%-40% higher than that of coal-fired boilers.

Burning the same ton of coal, is the hot water boiler with high thermal efficiency or the heat transfer oil boiler with high thermal efficiency.

The combustion of the same ton of coal is rotten and defeated, which is the high thermal efficiency of the heat conduction oil boiler. Because the thermal efficiency of the biomass heat transfer oil boiler is usually more than 80%, the thermal efficiency can reach higher after full combustion. Therefore, burning the same ton of coal is the thermal efficiency of the heat transfer oil boiler.

The heat conduction oil pot is also known as the steam pot, the cooking pot, and the sandwich hunger steam pot. Sandwich pots are widely used in the processing of candy, yao, rupin, wine, pastries, candied fruit, beverages, canned food, lo-mei and other foods, and can also be used in large restaurants or canteens to boil soup, cook, stew, porridge, etc., and are good equipment for food processing to improve quality, shorten time and improve labor conditions.

The calculation formula of gas boiler thermal efficiency: boiler thermal efficiency = 100% - (a+b+c+d+e).

1. A = exhaust gas heat loss. The heat loss increases by about 13% for every 13 or so increase in exhaust gas temperature, i.e. (exhaust gas temperature - room temperature) 13.

2. b = incomplete combustion heat loss of gas.

3. C = mechanical incomplete combustion heat loss.

4. D = heat dissipation loss. Number difference.

5. E = ash slag physical potato hunger heat loss.