Currently there are four main ways of heating by heating: City heat networks, regional heating boiler house (containing coal, gas, oil, electric boiler), clean energy for household heating (natural gas wall heater, electric heating) and a small stove. According to the fuel type mainly coal, oil (gas) and electric heating.

In order to ensure and improve the air quality, promotion and use of clean energy, many coal-fired boiler into oil-fired (gas) boiler. Fuel oil (gas) boiler room with coal-fired boiler room's advantages are: small footprint, good working environment, low emissions and is conducive to environmental protection; the biggest disadvantage is the large increase in fuel costs. Fuel oil (gas) boiler room, the boiler should be considered in the design of the characteristics of first security, followed by energy saving.

Natural gas is a very valuable energy, especially natural gas tensions in recent years, therefore, how to implement gas-fired boiler for heating, energy conservation, and becomes the hot issues of great concern. Gas-fired heating boiler system for energy-saving of this will be needed from all aspects of the design, construction and operation of. Following from the design aspects of energy-saving measures taken by the gas-fired boiler room.

1, weather compensation system

Heat consumption of buildings due to the outside air temperature, solar radiation, humidity, wind direction and wind speed and other factors varies from moment to moment. To guarantee in above factors changes of conditions Xia, maintained indoor temperature constant (18 ℃ ± 2 ℃) or meet user requirements, heating system of for backwater temperature on should in whole heating during according to outdoor meteorological conditions of changes for regulation, to makes boiler heating volume, and thermal equipment of put heat and buildings of needed heat phase consistent, prevent user indoor occurred at room temperature low or high of phenomenon. Through the timely and effective regulation can be done on the premise of guaranteeing quality of heating to reach maximum energy saving. Changes in outdoor temperature determines the buildings heat size also determines the level of energy consumption, operation parameters must be adjusted with the outdoor temperature changes all the time, always ensure the amount of heating boiler rooms and buildings conform to the heat, the only way to achieve maximum energy saving. Each boiler room should go in my own running running this curve is the optimum operating curve to the boiler room. Climate compensation systems is to provide optimum operating curve for boiler room systems.

2, flue gas condensation thermal energy recovery system

Small and medium gas (oil) steam boilers (including imported boiler) have largely been without air preheater and economizer, thus resulting in higher exhaust gas temperature, generally 160 ℃, and some have even reached 200 degrees, larger boiler flue gas loss. Losses due to gas-fired boilers without mechanical incomplete combustion and ash's physical loss, so the boiler gas boiler exhaust gas heat losses total heat loss above 80%, reasonable controls to improve the thermal efficiency of boiler exhaust gas temperature, energy conservation will play a very important role.

By analyzing various fuel gas components, identified the following characteristics: steam volume on a variety of fuels of gas composition in the share of the distributions are: gas 20%, oil and coal 4%. Why are the largest percentage of the volume of water vapor in the flue gas composition of natural gas? As the main component of natural gas is methane (CH4), since it has a lot of hydrogen, combine with oxygen when burned, produces a lot of water vapor.

Carried by 1 kg of steam per hour to generate steam heat is 2,400KJ,0.7MW 30-40 kg is roughly 0.7MW away 25-33 hours of heat. Heat loss is so great, this part must be heat recovery back, improving boiler efficiency, reduce gas consumption.

Countries have already recognized the seriousness of this problem, currently has generally reduced exhaust gas temperature 70 ℃, the minimum can be 40 degrees centigrade.

Dew point of flue gas temperature of about 58 degrees Celsius, as long as the exposure to below the dew point temperature of the medium, it will condense into water, releasing large amounts of heat. The heat is made up of two parts: (a) physical heat: achieved by reducing flue gas temperature, exhaust gas temperature can be controlled at 70-80 ° c. After the test, reducing flue gas temperature 20-50 ℃, can increase the thermal efficiency of boiler 1%-3%, (ii) latent heat of vaporization: realized through the phase transition water vapor condensing into water, tested can improve thermal efficiency of boiler 3%-5%. Combination can improve thermal efficiency of boiler 3%-8%.

The thermal efficiency of gas-fired boiler itself has reached 90%, such as the to make candle by ontology to improve the thermal efficiency of boiler, less effective. Through the use of flue gas condensation thermal energy recovery system, on the premise of not affecting the thermal efficiency of the boiler itself, improving boiler thermal efficiency of 3%-8%, will be a minimal cost, gains maximum energy saving mode.

Application of plate-shell heat exchangers for waste heat recovery of condensed water, and waste heat recovery from flue gas of boiler exhaust gas heat recovery.

3, heating system with hydraulic balance

Heating system energy consumption level depends not only on heat, but also with the entire pipeline system. In heating systems, there is a widespread problem of waterpower maladjustment in, hydraulic disturbances caused uneven system, away from heat sources closer to the user, the indoor temperature is higher, user of the distance to the indoor temperature is lower. To ensure that remote users to the indoor temperature, had to raise water temperatures and increased water flow in pipe network, not only it is difficult to guarantee the quality of heating and caused a huge waste.

Through the test, often near-end user flow is several times the remote subscriber units discharge, in order to enable the remote user reaches 16 degrees Celsius, near end users has more than 20 ℃ at room temperature, or even open the Windows cause energy waste. Through practice, hydraulically balanced adjustment can save energy around 10%.

4, centralized control of heating system of gas-fired boiler room

Fuel oil (gas) boiler thermal efficiency is much higher than coal-fired boilers, generally above 92% (atmospheric boiler combustion module), but provided by the manufacturer of the boiler thermal efficiency of the boiler is under rated load, when the boiler operating conditions deviate from the design point, the thermal efficiency of the boiler is changing. At present, imports can generally provide boiler thermal efficiency of boiler load curve or data, but can hardly provide a domestic boiler thermal efficiency of boiler vary with load curve or data. In actual operation, the change of external heat load is always needed, running isn't constant at the top points of the boiler load operation.

In the boiler room designed not only to choose the high thermal efficiency of the boiler, as well as to measures for improving the overall thermal efficiency of the boiler room. Multiple parallel operation of boilers by group control is necessary to improve the thermal efficiency of boiler rooms total. So-called group control is according to the required heat load changes rationally determine the boiler running number, scientific distribution of boiler heat load, try to make each boiler running at optimal operating point, thereby enhancing the thermal efficiency of boiler rooms total.

Do not group multiple parallel operation of the boiler, when outsiders needed to load changes, the boiler at the same time lower the load while increasing load, each boiler is not in the best condition to run, is bound to cause total thermal efficiency of boiler room is not high, or all the modules installed boilers in boiler room.

5, time zone control

Through the timeshare to the residential and Office area, zone control the indoor temperature, achieve the purpose of on-demand heating, good energy savings. Scope for district heating, Office and school buildings shall, in accordance with the need for heating, reducing waste.

6, water use to save resources

Measures taken in the boiler room to enable the draining system according to its attributes full recycling, main water-saving measures are:

In addition to supplying steam to steam users, but other hot water heat exchanger systems have settings for a user in the boiler room, on the one hand to facilitate the centralized management, reducing operator, more important is the full recovery of condensed water, reduce water and heat loss;

For steam users outside the boiler room to take closed-type condensed water recovery of steam condensate recovery device, to ensure the condensation water quantity and quality;

Continuous sewage water into the steam boiler continuous blowdown system, thermal deaerator for their secondary steam, high temperature hot water into the fill the water tank as a supplementary heating system with water heating system.