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Energy-saving Retrofit Technology of Industrial Boiler
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Energy-saving Retrofit Technology of Industrial Boiler

Views: 0     Author: Sifang Boiler     Publish Time: 2018-05-30      Origin: Site

      The molecular structure of the hydrocarbons treated by the fuel economizer will change, the fine molecules will increase, the intermolecular distance will increase, and the viscosity of the fuel will decrease. As a result, the fuel oil will be atomized and refined before combustion. The degree of combustion is greatly improved, and it is sprayed into the combustion chamber to be fully burned under low oxygen conditions, so the blast volume of the combustion equipment can be reduced by 15% to 20%, avoiding the heat taken away in the flue, and the flue temperature is reduced by 5°C to 10°C .After the fuel of the combustion equipment is treated by the economizer, due to the improved combustion efficiency, the fuel can be saved by 4.87% to 6.10%, and the flame is bright and dazzling, the black smoke disappears, and the furnace is clear and transparent.Thoroughly remove the coking phenomenon of the combustion nozzle and prevent re-coking.Eliminate the phenomenon of residue accumulation on the furnace wall due to insufficient combustion of fuel, and achieve the effect of environmental protection and energy saving.It greatly reduces the air pollution caused by the exhaust gas emitted by the combustion equipment. The harmful components such as carbon monoxide (CO), nitrogen oxide (NOx), and hydrocarbons (HC) in the exhaust gas are greatly reduced, and the harmful exhaust gas is reduced by more than 50%.At the same time, the dust content in the exhaust gas can be reduced by 30%-40%.Installation position: installed between the oil pump and the combustion chamber or nozzle, the ambient temperature should not exceed 360 ℃.
2. The exhaust gas of the condensing gas boiler economizer  
      contains up to 18% water vapor, which contains a large amount of latent heat that is not used, the exhaust gas temperature is high, and the sensible heat loss is large.The combustion of natural gas still emits pollutants such as nitrogen oxides and a small amount of sulfur dioxide.Reducing fuel consumption is the best way to reduce costs. The condensing gas boiler economizer can be directly installed in the existing boiler flue to recover the energy in the high temperature flue gas and reduce fuel consumption. The economic benefit is very obvious. At the same time, the condensation and absorption of water vapor Nitrogen oxides, sulfur dioxide and other pollutants in flue gas can reduce pollutant emissions and have important environmental protection significance.
3. Using condensing waste heat recovery boiler technology
      In traditional boilers, the exhaust gas temperature is generally 160-250 ℃, and the water vapor in the flue gas is still in a superheated state, and it is impossible to condense into liquid water and release the latent heat of vaporization.As we all know, the thermal efficiency of the boiler is calculated based on 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 thermal efficiency of traditional boilers can generally only reach 87% to 91%.The condensing waste heat recovery boiler reduces the exhaust gas temperature to 50-70 °C, fully recovers the sensible heat in the flue gas and the condensation latent heat of water vapor, and improves the thermal efficiency; the condensed water can also be recycled.
4. The waste heat recovery technology of heat pipe is adopted at the tail of the boiler. Waste  
      heat is the energy that has not been utilized in the energy utilization equipment under certain economic and technical conditions, that is, the excess and waste energy.It includes seven kinds of waste heat of high temperature exhaust gas, waste heat of cooling medium, waste heat of waste steam and waste water, waste heat of high temperature products and slag, waste heat of chemical reaction, waste heat of combustible waste gas and waste liquid and waste, and waste pressure of high pressure fluid.According to the survey, the total waste heat resources of various industries account for about 17% to 67% of their total fuel consumption, and the recyclable waste heat resources are about 60% of the total waste heat resources. 
      The superconducting heat pipe is the main heat conduction element of the heat pipe waste heat recovery device, which is fundamentally different from the ordinary heat exchanger.The heat exchange efficiency of the heat pipe waste heat recovery device can reach more than 98%, which cannot be achieved by any ordinary heat exchanger.The heat pipe waste heat recovery device is small in size, only 1/3 of the ordinary heat exchanger.Its working principle is as shown in the figure: the left side is the flue gas channel, the right side is the clean air (water or other medium) channel, and there are partitions in the middle that do not interfere with each other.The high-temperature flue gas is discharged from the left channel. When discharging, the high-temperature flue gas flushes the heat pipe. When the flue gas temperature is greater than 30°C, the heat pipe is activated and automatically conducts heat to the right side. At this time, the left side of the heat pipe absorbs heat, and the high-temperature flue gas flows through the heat pipe. The temperature drops and the heat is absorbed by the heat pipe and conducted to the right.Under the action of the blower, the clean air (water or other medium) at room temperature flows in the opposite direction along the right channel to flush the heat pipe. At this time, the heat pipe releases heat on the right side, heating the clean air (water or other medium), and the temperature rises after the air flows through the heat pipe.The waste heat recovery device composed of several heat pipes is installed at the boiler flue port to absorb the heat in the flue gas and conduct it to the other end at a high speed, so that the exhaust gas temperature is reduced to close to the dew point and the heat emission loss is reduced.The heated clean air can be used to dry materials or be added to the boiler for recycling.Improve the thermal efficiency of boilers and industrial furnaces, reduce fuel consumption, and achieve the purpose of energy saving. 
      In the design and manufacture of industrial fuel-fired, gas-fired and coal-fired boilers, in order to prevent corrosion and fouling of the heating surface at the tail of the boiler, the standard state exhaust gas temperature is generally not lower than 180 °C, and the maximum can reach 250 °C. waste and pollute the environment. 
      The heat pipe waste heat recovery device can recover the heat of the flue gas, and the recovered heat can be used to heat the water for boiler make-up water and domestic water as needed, or to heat the air for boiler combustion air or drying materials.Save fuel costs, reduce production costs, reduce exhaust emissions, energy saving and environmental protection can kill two birds with one stone.The transformation investment is recovered in 3-10 months, and the economic benefits are remarkable.

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