gas fired condensing boiler

Electric utility interest in supercritical pressure steam cycles has revived in the United States after waning in the 1980s. Since supercritical cycles yield higher plant efficiencies than subcritical plants along with a proportional reduction in traditional stack gas pollutants and CO{sub 2} release rates, the interest is to pursue even more advanced steam conditions. The advantages of supercritical (SC) and ultra supercritical (USC) pressure steam conditions have been demonstrated in the high gas temperature, high heat flux environment of large pulverized coal-fired (PC)fired condensing boilers.

Boilers which are several general, in what is now the mainstream Why? 1, gas fired condensing boiler advantages: efficient, clean, environmentally friendly, without manual operation, only need to monitor, small footprint, no transportation fuel, no need to deal with soot, due to the combustion of natural gas free of impurities, without corrosion damage to the boiler and related accessories long boiler life, defined as 15 years, but basically long-term use. Is now mainstream boiler, natural gas is the environmental protection sector, the government vigorously promoted. Cons: You do not know how much that gas prices are calculated according to the calorific value and thermal efficiency, generally bituminous coal per ton of coal (according to 5500 kcal / kg) is approximately equal to 350 to 400 cubic meters of gas. Probably a little slightly more expensive than coal. (No transport, area, ash handling, labor, etc. into the calculation). 2, oil-fired boiler, advantages: substantially the same structure and properties of gas boilers. Disadvantages: higher cost of natural gas is 2 times the boiler, diesel transportation, storage more dangerous, accident-prone. And the domestic diesel supply is unstable, easily interrupted. 3, coal-fired boilers, the advantages: the economy. Disadvantages: 1, requires a lot of ash and coal yard area. 2, a boiler fireman for 4 to 8 people. 3, boiler room and coal yard is very dirty. 4, noise, emissions of dust, nuisance. 5, environmental protection departments often to check an inattentive, he was diagnosed with excessive emissions, maintenance shutdown, fine, very troublesome. 6, coal sulfur content are more severe corrosion of boiler, 10 to 15 years after the basic unusable. Summary: Due to high oil prices and supply unstable now, and now oil-fired boiler has been temporarily withdrawn from the market. Natural gas prices due to regional differences are very different, although you are not sure where the price of natural gas, but natural gas in most parts of the domestic coal is relatively expensive, (only in Sichuan, northwest of cheaper natural gas). Especially large industrial boilers, more fuel, the cost difference is more obvious. Coal-fired boilers to heavy air pollution, with the country on environmental issues more and more attention, more stringent emission requirements for coal-fired boilers, a lot of urban cities, has stopped the examination and approval procedures coal-fired boilers. It is recommended that, if your organization is not large tonnage production of boilers, installation of gas boilers or better, although with a little more than fuel costs, but in the actual operation of the process, you can save a lot of things, while saving area, the environment is clean.

Coal-fired fired condensing boilers to gas boilers benefits and precautions With the rapid development of national energy-saving environmental protection, the traditional coal-fired boiler can not meet the needs of the times. Therefore, the coal-fired boiler biomass boiler or gas boiler has become in many boiler user's choice. Before the transformation, to understand the difference between .1 and gas boiler fired boiler. Circulating fluidized bed combustion boiler fired by coal crushing device fluidized combustion process, the coal by crushing device percutaneously into the bunker through a the spreading coal coal injecting air into the furnace; circulating ash by heating, fluidized combustion process. When the coal into a gas fuel is injected directly into the combustor for combustion. 2. Combustion of Coal is mainly composed of C, H, O, N, S, ash and moisture and other elements. Generated when coal SO2, SO3, NOx ash and moisture, and SO2, SO3, NOx from flue gas emitted into the atmosphere, pollute the environment and cause harm to humans. The main components of the exhaust gas and coke are CO and H2. The main produce CO2 and H2 post-combustion, much lower than coal-fired boiler SO2, SO3 and NOX emissions. 3. Ventilation pressurized combustion coal combustion boiler used in a combustion mode. The bottom of the combustion process through the induced draft fan with fan and completed. In the combustion of coal, it requires a lot of air. Gas under a slight positive pressure in the boiler or burner slightly negative pressure, which requires less airflow. Burner air may be pre-mixed with natural gas. 4. coal boiler control reasons, material thickness, amount of wind, the wind volume, wind and other than coal, coal-fired boiler is difficult to automatically adjust the operating parameters of the boiler according to the load. However, fewer factors gas boiler, the burner valve can be adjusted according to the size of the load, easy to implement automatic control. Coal-fired boiler to a gas boiler Notes: Main results are as follows: (1) small boiler, the coal-fired boiler to a gas boiler, i.e. the negative pressure of combustion from the original to the current combustion slight positive pressure, and must pay attention to the furnace wall structure sealing problems. Closely related (2) selection and arrangement of the burner and furnace, the degree of filling of the flame in the furnace is preferably not formed dead air, to avoid the interference of adjacent flame burners, to avoid interference from adjacent burner flame. Unburned gas - air mixture should not be in contact with a heated surface, in order to avoid incomplete combustion. Gas combustion. Gas burner arrangement disposed conduit and ducts should be considered reasonable gas pipe and duct arrangement, ease of operation, inspection and maintenance. (3) the transformation of coal-fired boilers is mechanized layered gas boiler should be removed before the arch and the arch, and the bottom heating surface increases, in place of the grate, the grate to prevent overheating. Gas Velocity (4) on heat transfer surface of the fly ash is not restricted abrasion conditions, convection heating surface heat transfer coefficient is increased, increasing the pressure in the boiler where H is unduly increased. Boiler erosion surface. At this time, the capacity of the boiler should be noted that the steam separator to ensure the quality of the steam.

To increase the pollution control efforts of industrial fired condensing boilers, Guangdong Province, by focusing on advancing heating, coal gas and other projects, Xinsha Port Zone, Dongguan City, do not meet the emission standards for industrial boilers and chimneys have size "off the shelf"; there are 26 companies mentioned standard complete renovation work, out of a total of 82 sets of industrial boilers, another 16 companies to complete remediation goals before the end of this year.

Paper and other industries 26 key enterprises mentioned standard transformation, out of 82 sets of industrial boiler

Xinsha Port perimeter around the paper, grain, feed processing enterprises, industrial boilers, grain and oil processing, volatile oil and gas, will have some involving VOCs gas. In recent years, nearby residents have been repeatedly complained unpleasant smell in the air.

To this end, the Dongguan municipal government attaches great importance to air pollution problems Xinsha Port Zone, the development of air quality Xinsha Port Zone in December 2018 to enhance the action. The municipal environment department lead, together with territorial ecological environment, urban management, water supply, public security, Food and Drug Administration and other departments to form joint municipal law enforcement inspection teams to go to Area carpet investigation involving air polluters.

Meanwhile, with the third party monitoring techniques to determine the 42 polluters. This 42 companies were included to enhance the focus of regulation directory, according to the state of production and operation of enterprises, the development of personalized remediation timetable and roadmap.

Currently, there are 26 to complete the renovation work mentioned standard, out of a total of 82 sets of industrial boilers. Another 16 companies to complete remediation goals before the end of this year.