Measures to improve the thermal efficiency of the fuel gas-fired boiler wns type of chemical oil-fired boiler which is incomplete combustion heat loss and mechanical incomplete combustion heat loss. Because almost no ash after combustion of the gas boiler, solid and liquid fuels without mechanical incomplete combustion, there is no need to consider the mechanical incomplete combustion of the gas boiler heat loss. In all heat losses, heat losses have tremendous proportions, when the high thermal efficiency of boilers, heat losses so the total loss of the main heat losses of fuel gas-fired boiler flue gas heat loss is the exhaust gas temperature and For air excess factor. When the exhaust gas temperature decreases, high thermal efficiency can be obtained, for example, a conventional three-pass wns series 1ton steam boiler, furnace used in the past straight and smooth smoke tube, must increase the heating surface is arranged to make the exhaust gas to an acceptable degree, the theoretical discharge around the smoke heat loss. Potshell causing significantly increased diameter, wall thickness increased, greatly increased metal consumption, thus further reducing the exhaust gas temperature should be greatly restricted. From the aspect of heat transfer is not only now consider only the heated area, the use of new technology enables heat transfer performance significantly increased, the difference between the heat transfer overcomes the disadvantages of the past performance of the boiler, so that the exhaust gas temperature decreases, the structure is more compact. Center back boiler combustion boiler is preferably small foreign structure, although the two-pass boiler, the heated area is small, but the use of the turbulator charming, the purpose of enhancing the turbulence of the flue gas, disrupt laminar flow boundary wall, reducing the thermal resistance, increasing the heat transfer coefficient, a smaller heating area to achieve the same high thermal efficiency. Lower exhaust gas temperature limit in theory, the exhaust gas temperature can be reduced to very low or even close to the ambient temperature, for maximum thermal efficiency. However, in practice, due to the reduction of the exhaust gas temperature, low temperature corrosion will cause, therefore, the exhaust gas temperature can drop too low, in order to ensure that the wall temperature is higher than the main boiler heating surface flue gas dew point temperature. Therefore, low-temperature corrosion has become a major obstacle to reduce exhaust gas temperature and improve the thermal efficiency of the boiler. Tail auxiliary heating surface increases, further reducing the exhaust gas temperature, fuel gas wns improve thermal efficiency of the boiler as the oil, gas fuel burn easily wns type gas boiler air preheater generally not disposed. The economizer means is a common energy, which can be recycled flue gas was able to effectively reduce exhaust gas temperature. Separation type condensing gas boiler is out of the main boiler heating surface, the installation of the condensing heat exchanger. In one aspect of the flue gas absorption can significantly reduce the smoke temperature, reducing heat losses, on the one hand the absorption of part of the potential condensing water vapor released, increasing the effective use of heat of the fuel. Ash cleaning, to ensure that the heating surface of the scale wns boiler thermal efficiency of the boiler, the presence of soot fouling and heat transfer resistance increases, reducing the heat transfer effect. The thermal conductivity of the scale and soot is almost of the same order of magnitude, with the increase in scale, soot, the exhaust gas temperature rapidly increases, the thermal efficiency is significantly decreased. So, keep the boiler heating surface inside and outside clean, efficient heat transfer, thermal efficiency and to ensure the safe and economic operation of boilers, boiler fuel gas-fired boiler ash cleaning is required.
The reason the gas boiler burner noise analysis increases in the use of gas-fired boiler, found a small fire is normal, but when it becomes a fire goes out or flashing instability. First, because of excessive wind fire damper is provided; secondly, because of the fire valve microswitch (outermost damper group) is set incorrectly (fire damper is set larger than the amount of wind). Fuel circuit closing valve or port into the oil shortage, an oil filter plugging, increased gas burner boiler noise; Alternatively, since the oil inlet temperature is low, the viscosity is too high, the oil feed pump temperature, pump failure, fan motor bearing damage, and because the fan impeller dirty equipment, resulting in noisy equipment. Gas boiler in the course of the above failures, the viscosity is too high to spray the oil (heavy oil), and improper nozzle plate from the cyclone, and the like due to worn or dirty nozzles plus reasons. May be due to too high a heating temperature of the tank, leading to the steam delivery oil pump is not smooth; or because the fuel oil boiler caused by the water content. In use the gas boiler, the above failures should be gradually reduced, the heating temperature, to adjust the distance (0 ~ 10mm), cleaning or replacement should be about 50 ℃, the heating temperature should be raised. Oil change or drainage.
The main functional difference component of natural gas and wns series 1ton steam boiler 1. The raw materials of the boiler combustion products of coal are carbon, hydrogen, oxygen, nitrogen, sulfur and water. Gas-fired steam boiler burner underlying mode, two-pass configuration, the fuel combustion, the boiler operation is stable and take up less space, while the spoiler is inserted smoke tube, smoke slow speed, increase heat transfer, a high thermal efficiency, reducing user fee gas hot water boiler with environmental protection, energy conservation, safety, salient features fully automatic operation, and ease of use. in addition, due to the operation of the economy, government policies to encourage, gas hot water boiler more and more people of all ages. Function gas boiler the ignition system that ignites the mixture of air and fuel, its main components are: the ignition transformer, the ignition electrode, a high voltage electrical cable fire. A more secure electronic ignition system called ignition pulse, is widely used Zhuoyi energy saving gas boiler manufacturers. Which facilitate saving, can simply press a finger, and safe, does not occur due to unexpected accidents occur flame, once the stall state occurs, the control system can close the solenoid valve, off the gas passage. After combustion, sulfur dioxide, sulfur trioxide and nitrogen oxides are discharged to the atmosphere, environmental pollution, cause harm to humans. The main component of natural gas is CH4, CO2 and H2O mainly produce post-combustion, compared with coal-fired boiler, gas boiler emissions of more environmentally friendly and better able to reduce urban air pollution problems. 2. The most common combustion coal-fired boilers are stratified combustion. This process mainly refers to coal fuel disposed in a larger work surface to complete combustion. Passage means to the coal bunker broken belt, ran into the furnace through the coal feeder, coal use wind; primary embodiment using a gas boiler furnace combustion gas into the main combustion chamber, combustion is completed in the form of flare. Wherein the main advantage of the stream bed combustion mode is reliable and stable, good economy; coal corresponding disadvantage is the need, not flexible. At the same time, the combustion mode is the stratified combustion "firing-sided" and "staged combustion", which is in Rongyifasheng bunker coal bunker bridges. Combustion chamber combustion with high efficiency, clean environment, burning the advantages of automation. At the same time, such a small area of combustion, combustion does not need to be transported, and the combustion gas free of impurities, which boiler life relatively long. Gas boiler can withstand a high thermal load, it is possible to select a smaller furnace space. 3. coal-fired boiler safety relatively safe, small furnace combustion hazard. To be clear Anquancuoshi gas boiler, Rongyifasheng explosion within the explosion limits. The main use of coal-fired boiler stratified combustion, therefore, the need for timely when coal-fired boiler shutdown, even if you stop coal, there is still a lot of fuel in the furnace is not, can continue to burn. Accordingly, the gas pressure rising in the furnace, endanger the safety of the vessel. The main gas-fired boiler using natural gas fuel. When the boiler needs to be stopped in time to run, you can understand, stop the transmission, security is guaranteed. Further, no storage device can effectively reduce transportation costs, space costs. But the most important thing is explosive natural gas to reach the explosive limit, once the fire may occur, endangering the lives and safety of the explosion, while coal-fired boilers do not need to take this into account. 4. vented combustion coal-fired boiler with the blower is run together. Coal is a coal-fired boiler with solid fuel. The particle size of coal and coal combustion own characteristics resulting in a large excess of gas in the furnace during combustion of coal-fired boilers. Further, in addition to leakage of the combustion chamber flue, the coefficient of excess gas can reach 2.0 to 2.4. The main ventilation gas boiler is a slight positive pressure ventilation structure having an internal combustion, the combustion products in combustion operation is mainly discharged from the blower. Boiler primary combustion gas may be a hydrocarbon such as methane gas mixed with air, in which operation of the ventilation exhaust port air ratio only 1.2≤1.3 ~ 1.05, the amount of smoke produced by the boiler is very small, the gas less impurities, while the flue gas emissions are also easier to meet the requirements of national combustion equipment, slag and other dust without increasing the equipment. Gas boiler can not only reduce environmental pollution, and the relatively small investment in equipment, boilers longer life expectancy.
Yesterday we learned that the Guangdong Province to increase pollution control efforts by the provincial people's government approval, Guangdong Province Market Supervisory Authority, the ecological environment of Guangdong Province, Guangdong Province, recently issued jointly approved by local standards "boiler air pollutant emission standards." Compared to the original standard, including contaminant particulate matter, sulfur dioxide, nitrogen oxides, etc. received strict emission limits help to further reduce the total emissions of air pollutants.
Provincial Department of environment-related offices responsible person, the current Guangdong Province "Boiler Air Pollutants Emission Standards" promulgated and implemented more than eight years, with advances in pollution control technology, emission control requirements of its apparent leniency. Meanwhile, Guangdong air pollution control task is arduous, urgent need to close strict standards, further reducing the total emissions of air pollutants.
Guangdong "boiler air emission standards" in the context of the implementation province domain for coal, the material forming the fuel oil, gas and raw fuel 65 tons of steam per hour and less steam boilers, hot water boilers of various capacities and Heat Transfer Material Heater; stoker various capacities, stoker furnace.
The new "boiler air pollutant emission standards" (DB44 / 765-2019) to adjust six major areas.
A clear the raw fuel material forming air pollutants emission limits fuel boiler;
Second, the received strict emission limits boiler air pollutants, increasing the emission limits coal boiler mercury and its compounds;
Third, the abolition of provisions different emission limits by functional area and boiler capacity;
Fourth, in particular an increase of atmospheric pollutant emission limit requirements;
Fifth, increase the fugitive emission control requirements;
Sixth, the excess air ratio conversion flue gas pollutants to the atmosphere of pollutants emission concentration of the reference oxygen content conversion, the oxygen content of the clear reference atmospheric pollutants fired boiler burning biomass.
The new standard in the province gamut execution, the execution time of the specific step-wise: new boiler effect since April 1 this year; the transformation of boilers give some time, depending on which region, from 1 July 2019 2020 or the date of July 1 implementation of the new standards.
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