Questions on energy-saving transformation of Suzhou boiler recycling?
Questions on energy-saving transformation of Suzhou boiler recycling?
Boiler and auxiliary energy-saving emission reduction technology Boiler auxiliary equipment supporting equipment is the basic point to achieve a smooth flow of combustion medium, fire, combustion, burnout and material flow, and it is also the technically energy-saving and environmental protection basis. Industrial boilers are mainly coal-fired, and coal-fired industrial boilers are mainly high-temperature chain-grate boilers. Therefore, chain-grate boilers are the subject of energy conservation and environmental protection, and are also the disadvantages of energy-saving and environmental protection of industrial boilers. For chain-grate boilers, energy conservation and environmental protection must revolve around two ways to reduce mechanical incomplete combustion losses and exhaust heat losses: One is to strengthen the ignition, combustion, and exhaustion of coal from the design of combustion equipment and the structure of the combustion chamber. And heat transfer technologies, including innovative grate slabs and air distribution structures, furnace arches and secondary air for enhanced ignition, combustion and burnout technologies, and reburning and burnout technologies to reduce the carbon content of ash and fly ash.The main task is to reduce machinery Incomplete combustion loss, such as reducing the carbon content of ash, needs to be optimized from the four aspects of furnace arch design, secondary air adjustment, grate plate design, and air distribution uniformity.
① add fuel;
The hydrocarbon structure processed by the fuel economizer changes the molecular structure, increases the number of small molecules, increases the distance between molecules, and reduces the viscosity of the fuel. As a result, the fuel oil is atomized and refined to a great extent before being burned. The room is fully burned under low oxygen conditions, so the blower volume of the combustion equipment can be reduced by 15% to 20%, the heat taken away from the flue is avoided, and the flue temperature is reduced by 5 ° C to 10 ° C. After the fuel of the combustion equipment is processed by the energy saver, it can save 4.87% to 6.10% due to the improved combustion efficiency. It is obvious that the flame is bright and dazzling, the black smoke disappears, and the furnace is clear and transparent. Completely eliminate the coking phenomenon of the burning oil nozzle and prevent re-coking. Eliminate the phenomenon of residue accumulation on the furnace wall due to insufficient combustion of fuel, and achieve environmental protection and energy saving effects. Greatly reduce the air pollution caused by the exhaust gas emitted by combustion equipment. The harmful components such as carbon monoxide (CO), nitrogen oxide (NOx), and hydrocarbon (HC) in the exhaust gas have been greatly reduced, and the emission of harmful exhaust gas has been reduced by more than 50%. At the same time, the dust content in the exhaust gas can be reduced by 30% -40%. Installation location: Installed between the oil pump and the combustion chamber or nozzle, the ambient temperature should not exceed 360 ℃.
② Install condensing gas boiler energy saver;
The gas boiler exhaust gas contains up to 18% of water vapor, which contains a large amount of latent heat that has not been used, the exhaust gas temperature is high, and the sensible heat loss is large. After the combustion of natural gas, pollutants such as nitrogen oxides and a small amount of sulfur dioxide are still emitted. Reducing fuel consumption is the best way to reduce costs. The condensing gas boiler economizer can be installed directly in the existing boiler flue, recovering the energy in the high temperature flue gas, reducing the fuel consumption, and the economic benefits are very obvious. At the same time, the condensation and absorption of water vapor Nitrogen oxides, sulfur dioxide and other pollutants in the flue gas have important environmental protection significance to reduce pollutant emissions.
③ Adopt condensing waste heat recovery boiler technology;
In traditional boilers, the exhaust temperature is generally 160-250 ° C. The water vapor in the flue gas is still in a superheated state, and it is impossible to condense into liquid water and give off latent heat of vaporization. As we all know, the boiler thermal efficiency is calculated by the low-level heating value of the fuel, without considering the heat loss of the latent heat of vaporization in the high-level heating value of the fuel. Therefore, the traditional boiler's thermal efficiency can only reach 87% ~ 91%. The condensing waste heat recovery boiler reduces the exhaust temperature to 50-70 ° C, which fully recovers the sensible heat in the flue gas and the latent heat of condensation of water vapor, which improves the thermal efficiency; the condensed water can also be recycled.
④ The boiler tail adopts heat pipe waste heat recovery technology;
Waste heat is energy that is not used in energy utilization equipment under certain economic and technological conditions, that is, excess and waste energy. It includes seven kinds of waste heat: high-temperature waste heat, cooling medium waste heat, waste steam waste water waste heat, high-temperature products and slag waste heat, chemical reaction waste heat, combustible waste gas waste liquid and waste waste heat, and high-pressure fluid waste pressure. According to the survey, the total waste heat resources of various industries account for about 17% to 67% of its total fuel consumption, and the waste heat resources that can be recycled are about 60% of the total waste heat resources. Superconducting heat pipe is the main heat conduction element of heat pipe waste heat recovery device, which is fundamentally different from ordinary heat exchangers. 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 has a small volume, which is only 1/3 of that of an ordinary heat exchanger. The working principle is shown in the figure: the left side is the flue gas channel, and the right side is the clean air (water or other medium) channel. There is a partition in the middle to separate each other. The high-temperature flue gas is discharged from the left channel. When it is discharged, the high-temperature flue gas flushes the heat pipe. When the flue gas temperature is> 30 ° C, the heat pipe is activated to automatically transfer heat to the right. At this time, the left side of the heat pipe absorbs heat. The temperature drops and the heat is absorbed by the heat pipe and conducted to the right. The clean air (water or other medium) at room temperature flows under the blower in the opposite direction of the right channel to flush the heat pipe. At this time, the right side of the heat pipe releases heat and heats the clean air (water or other medium). After the air passes through the heat pipe, the temperature rises. A waste heat recovery device composed of several heat pipes is installed in the boiler flue, which absorbs the heat in the flue gas and conducts it to the other end at high speed, which reduces the exhaust temperature to close to the dew point and reduces heat emission loss. The heated clean air can be used to dry materials or replenish the boiler for recycling. Improve the thermal efficiency of boilers and industrial kilns, reduce fuel consumption, and achieve energy savings.
In the design and manufacture of industrial fuel oil, gas, and coal-fired boilers, in order to prevent corrosion and ash blocking of the heating surface of the boiler tail, the standard exhaust temperature is generally not lower than 180 ° C and up to 250 ° C. High-temperature flue gas emissions not only cause a large amount of thermal energy Waste and pollute the environment. The heat pipe waste heat recoverer can recover the heat of flue gas. The recovered heat can be used as boiler make-up water and domestic water as required, or heated air can be used as boiler combustion air or dry materials. Save fuel costs, reduce production costs, reduce exhaust emissions, save energy and protect the environment. The transformation investment is recovered within 3-10 months, and the economic benefits are significant.
⑤ Adopt anti-scaling and descaling technology;
By using boiler descaling agent, electronic scale preventer, and softened water treatment equipment, the water vapor circulation system is optimized. The water softening equipment can remove calcium and magnesium scaling ions in the water, soften the water quality, and reasonably control the boiler drainage rate, thereby reducing scale To improve boiler thermal efficiency.
⑥ Adopting fuel additive technology;
Adding additives to the fuel to optimize the fuel, achieve the purpose of reducing smoke and improving thermal efficiency;
(I) Use of new fuels;
The use of new environmentally friendly fuel oil to achieve the purpose of reducing fuel costs.
⑧ Using oxygen-enriched combustion technology;
The oxygen content in the air is ≤21%. Combustion of industrial boilers is also performed under such air. Practice has shown that when the amount of oxygen gas burned by the boiler reaches more than 25%, the energy saving can be as high as 20%; the boiler heating-up time is shortened by 1 / 2-2 / 3. Oxygen enrichment is to collect oxygen in the air using physical methods, so that the oxygen-rich content in the gas after collection is 25% -30%. Oxygen-enriched combustion is one of the latest energy-saving and environmentally-friendly technologies. Over the past ten years, with the continuous improvement of environmental protection requirements and the need to save energy, oxygen-enriched combustion, as an emerging combustion technology, has flourished in various countries around the world.
⑨ Adopting swirling combustion boiler technology;
As we all know, there are two major disadvantages of traditional boilers. One is that smoke and dust emerge during combustion and become an important source of pollution. The other is that coal slag is not burned sufficiently and energy waste is extremely serious. Compared with the traditional industrial boiler, the new technology of pure smokeless re-energy-saving swirl combustion boiler has absolute advantages. It saves 30% to 35% of coal compared to hand-fired boilers and 25% of coal compared to chain-type automatic boilers. The pure smokeless re-energy-saving technology uses PID frequency conversion and ABM power saving system, which saves 40% of electricity compared to traditional boilers, and can achieve more than 90% combustion and utilization of volatiles, while the burnout rate of volatiles in traditional boilers is only 78% About 22% of the smoke and dust is discharged to the atmosphere. The pure smokeless re-energy-saving swirl combustion technology makes the ash and slag burn-out rate reach 97%, while the traditional boiler coal slag burn-out rate is only about 80%. For these reasons, Pure smokeless re-energy-saving combustion technology can increase the furnace temperature from the original 1200 ° C to about 1500 ° C, improve combustion efficiency, save fuel, and meet customer needs.
⑩ Use air source heat pump hot water unit replacement technology;
Replace the existing fuel (gas) hot water boiler with an air source heat pump hot water unit; can save energy consumption by 30% to 50%
改装 Conversion of coal-fired boilers to oil (gas) boilers;
Energy saving method for boiler fuel energy saving and environmental protection