fixed grate gas hot water boiler
Before coming heating season, Pinggu and Yanqing, Miyun three areas have been completed six large coal-fired boiler clean energy transformation, involving a total of 1660 tons of steam, residential heating area of about 900 square meters, in order to promote the city's urban focus heating basically clean heating to make a strong contribution.
It is reported that, in addition to this rural area south of the coal-fired boiler house for reasons of space, and the remaining five of the original coal-fired boiler room facility will be retained as an emergency backup. Pinggu District-Valley heating plant boiler clean energy transformation project has been debugging equipment, the boiler room of the original four coal-fired boilers, a total of 400 tons of steam, heating an area of about 2.5 million square meters, the new 3 sets of 100 tons of steam gas boiler is equipped with a heat pump.
Also, according to plan, City Management Committee led the development of the annual Yajian coal and clean energy facilities construction program to focus on the northern region, enhance power supply, gas supply capacity, promote Plains natural gas pipeline "town pass" to protect coal demand for clean energy. The basic realization of the city's plains village "No Coal", the phasing out of bulk coal sales within the region transformation of the industry and commerce department for bulk coal sales cancellation of registration in accordance with law, in principle, be issued a new business license. For failure to implement clean heating in winter 2018 and not included in the annual village "coal to clean energy" program, full implementation of quality coal instead.
Reduction of carbon dioxide, sulfur dioxide emissions
Pinggu District Management Committee, according to the person in charge, Riverside, Xia Xing Coal Valley and heating plant is heating an area of 7.416 million square meters, of which the heating plant heating Riverfront area of 4.1 million square meters, the Xingu heating plant heating an area of 2.808 million square meters, summer Coal heating plant heating area 508,000 square meters.
By upgrading "coal to gas", three heating plants meet emission standards Beijing local standard NOx emissions of less than 30 mg / standard cubic meter, while the amount of coal Yajian 160,000 tons per year, greatly reduce emissions of carbon dioxide, sulfur dioxide, nitrogen oxide.
Among them, Xingu heating plant "coal to gas" project officially started on May 16 this year, October 20, Sheung Shui, October 27 with the ignition conditions.
Riverside heating plant "coal to gas" on May 16 this year started, has completed the boiler and associated piping, heat pumps and ancillary equipment installation, ongoing electrical, control system debugging, October 22 has been Sheung Shui, October 29 have ignition conditions.
Summer Coal heating plant "coal gas" this year officially started on August 18, has completed commissioning of boiler facilities and associated piping, heat pumps and ancillary equipment installation, ongoing electrical, control systems, etc., on October 29 water, with firing conditions.
Boiler is how the classification? Press export steam parameters of how to classify? Classification of the boiler is very extensive concept from different angles have different classification, can be classified by application area, according to the export media classification, but also by the pressure of the boiler classification. If the classification parameters according to the steam outlet, then find out which parameters steam boiler, wherein the boiler comprises evaporation, steam pressure, steam temperature etc., and is classified according to the main points of the outlet steam pressure: low pressure boiler (P <2.5MPa ), pressure in the boiler (22.5
Fire boiler design pitch is much: a room, boiler production plant belongs to class D, to a steam boiler rated evaporation 4t / h, when the rated output is greater than 2.8MW fixed grate hot water boiler, the boiler room building fire resistance rating of not less than two ; rated evaporation steam boiler is less than or equal to 4t / h, when the hot water boiler is equal to or less than the rated output 2.8MW, between the boiler building fire resistance rating of not less than three; m-inter-tank, oil pump and the oil heater are inter production plant belonging to class C, not less than two of its construction fire rating, between said room is arranged within the auxiliary boiler room, a room should be set apart from other firewall; March and gas regulator production plant belonging to Group A, which building fire rating of not less than two, should be provided between the boiler room and the immediate neighborhood regulator firewall spaced boiler room, which doors should open outwards and should not directly access to the boiler room, the ground should not be spark Ping.
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 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.