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Boiler and auxiliary energy saving technology

Date：2017/12/11type：Industry news

Boiler and auxiliary energy saving technology Boiler auxiliary equipment is to achieve the combustion medium, burning, burnout and material flow smooth and basic point, but also the basis of energy-saving technology. The main industrial boilers are coal-fired boilers, and the coal-fired industrial boilers are mainly high-temperature chain grate boilers. Therefore, the chain grate boilers are the subjective of energy saving and environmental protection as well as the disadvantages of energy saving and environmental protection of industrial boilers. For chain grate boilers, energy saving and environmental protection must focus on reducing the mechanical loss of incomplete combustion and exhaust heat loss in two ways: First, from the combustion equipment and combustion chamber structure design to strengthen the ignition of coal, combustion, burnout And heat transfer technologies, including innovative grate sheets and gas distribution structures, furnace arches and secondary air intensification ignition, combustion and burn-out technologies, reburning and burn-off technologies to reduce the carbon content of ash and fly ash, the main task is to reduce the mechanical Incomplete combustion losses, such as reducing the carbon content of ash, need to be designed from the furnace arch design, secondary air adjustment, grate piece design, with the wind uniformity of four aspects of optimization.

① Install fuel

Hydrocarbons processed by the fuel economizer, the molecular structure changes, the increase of small molecules, the distance between molecules increases, the viscosity of the fuel decreases, the result of the fuel oil atomized before combustion, the degree of refinement greatly improved, spray to the combustion The interior is fully combusted under low oxygen conditions so that the blasting capacity of the combustion equipment can be reduced by 15% to 20% to avoid the entrainment of heat in the flue and the flue temperature drops by 5 to 10 . After being processed by the economizer, the fuel of the combustion equipment can save 4.87% to 6.10% of fuel consumption due to the improvement of the combustion efficiency. It is obvious that the flame is bright and bright, the black smoke disappears and the hearth is clear and transparent. Thoroughly eliminate the burning oil nozzle of the phenomenon of coke, and prevent further coking. Relieve that the fuel can not be fully burned and the furnace wall residue residue phenomenon, to achieve environmental protection and energy saving. Greatly reducing the pollution of the air emitted by the exhaust gas emitted by the combustion equipment, greatly reducing the harmful components such as carbon monoxide (CO), nitrogen oxide (NOx) and hydrocarbon (HC) in the exhaust gas and reducing the emission of harmful exhaust gases by more than 50%. At the same time, the amount of dust in the exhaust gas can be reduced by 30% -40%. Installation Location: Installed between the pump and the combustion chamber or nozzle, the ambient temperature should not exceed 360 ℃.

② installation of condensing gas boiler economizer;

Gas boiler exhaust contains up to 18% of water vapor, which contains a lot of latent heat is not used, the exhaust gas temperature is high, sensible heat loss. After the combustion of natural gas, it still emits nitrogen oxides and a small amount of pollutants such as sulfur dioxide. Reduce fuel consumption is the best way to reduce costs, condensing gas boiler energy-saving device can be installed directly in the existing boiler flue, high-temperature flue gas recovery energy to reduce fuel consumption, the economy is very obvious, while the condensation of water vapor absorption Flue gas nitrogen oxides, sulfur dioxide and other pollutants, reduce pollutant emissions, has important environmental significance.

③ condensing waste heat recovery boiler technology;

In the traditional boiler, the temperature of the exhaust gas is generally 160-250 DEG C, the water vapor in the flue gas is still in an overheated state, and it is impossible to condense into liquid water to release the latent heat of vaporization. It is well-known that the boiler thermal efficiency is calculated from the low calorific value of the fuel, without considering the heat loss of the latent heat of vaporization in the high calorific value of the fuel. Therefore, the general thermal efficiency of conventional boilers can only reach 87% to 91%. The condensing waste heat recovery boiler, which reduces the exhaust gas temperature to 50 ~ 70 ℃, fully recovered the sensible heat in the flue gas and steam condensate latent heat to enhance thermal efficiency; condensate water can also be recycled.

④ boiler tail heat pipe waste heat recovery technology;

Residual heat is under certain economic and technological conditions, the energy used in energy-efficient equipment, that is, redundant, abandoned energy. It includes seven kinds of waste heat of high temperature waste gas, waste heat of cooling medium, waste heat of waste steam waste water, residual heat of high temperature products and slag, residual heat of chemical reaction, residual waste heat of combustible waste gas and waste, and residual pressure of high pressure fluid. According to the survey, the total waste heat in various industries accounts for about 17% to 67% of the total fuel consumption, and the waste heat recovery and utilization resources account for about 60% of the total waste heat resources. Superconducting heat pipe heat pipe heat recovery device is the main heat transfer components, and the ordinary heat exchanger is essentially different. Heat pipe heat recovery unit heat exchange efficiency up to 98%, which is any ordinary heat exchanger can not be achieved. Heat pipe waste heat recovery device is small, only ordinary heat exchanger 1/3. The working principle is shown in the figure: The left is the flue gas channel, the right is the channel of clean air (water or other medium) with the partition plate in the middle to separate each other. When the flue gas temperature> 30 ℃, the heat pipe will be activated automatically heat conduction to the right, then heat pipe on the left endothermic, high temperature flue gas flows through the heat pipe after the high temperature flue gas emissions from the left channel emissions, The temperature drops, the heat is absorbed by the heat pipe and conducted to the right. Clean air (water or other medium) at room temperature Under the action of a blower, the heat pipe flows along the right channel in the opposite direction to flush the heat pipe. At this time, the right heat pipe heats the clean air (water or other medium) and the air flows through the heat pipe to increase the temperature. The waste heat recovery device consists of several heat pipes installed in the boiler mouth to absorb the heat in the flue gas and conduct the high-speed heat to the other end so as to reduce the flue gas temperature close to the dew point to reduce the heat emission loss. The heated clean air can be used to dry the material or to recycle into the boiler. Improve the thermal efficiency of boilers and industrial furnaces, reduce fuel consumption, to achieve energy-saving purposes.