August 10, 2018, Shanghai Industrial Boiler Research Institute Co., Ltd. (hereinafter referred to as the working pot), the National Boiler and Pressure Vessel Standardization Technical Committee of Professional Committee of boiler energy conservation (hereinafter referred to as the Commission) was held in Chengdu, organizational GB / T16508 "shell boilers" revision of the second meeting of the reported revision of the second meeting, the main author of this standard, pot capacity standard Committee appointed sub-standard boiler, the special committee secretariat a total of 10 experts attended the meeting.
Organized by the Shanghai Institute of Industrial Boiler Co., Ltd. Deputy General Manager, committee chairman Wang Shanwu chair. He said the main author of the unit where the standard of support GB / T16508 standard revision of thanks and hope the standard revision process experts complement each other, support each other, the GB / T16508 benchmark revision as the boiler industry standardization work seriously treat, carefully modified. Amended in accordance with the basic principles of the first meeting to determine, in addition to technical support for the "Boiler Safety Technology Supervision" (referred to as "Boiler Rules"), but also take into account the needs of industrial boiler manufacturing enterprises, between consideration and GB / T16507 harmonization. At the same time listen to opinions, to further enrich the standard revision work force, give full play to industry leading products representative firm.
Yung pot boiler Technical Committee Standards Committee Secretary-General Zhang Rui introduced GB / T16507.1 "The first part of the water-tube boilers: General" and GB / T16507.2 "The second part of the water-tube boilers: material" revised draft of the general framework and main content.
Money Fenghua special committee Secretary-General reported on the GB / T16508 since revised "shell boilers" start, the main author of each criterion according to the revised terms of reference and requirements, the completion of the GB / T16508-2013 "shell boilers" since the implementation of the views of summary each sub-standard and contrast "boiler rules" (issued), the sub-standard job descriptions revised terms.
GB / T16508 the sub-standard main author of this according to the relevant sub-standard content and "Boiler Rules" (draft for approval) comparing the results of the relevant sub-standard and harmonized need to modify the content of the standard version 13 implementation of the existing problems and proposed amendments analyze and explain proposed amendments focus on the sub-standard and major amendments envisaged.
Experts on key issues related to the sub-standard for the exchange and discussion to reach a consensus on major revisions of this standard and requirements.
Meeting according to GB / T16508 revision schedule requirements, arranged next phase of work, the following:
1. Revision of Standards fleshed out power to complete the Standards Working Group set up before the end of August;
2. Please carefully review the main author of each standard GB / T16508.1 ~ 16508.8 major amendments description, and recommend changes, submitted to the Shanghai International Industry pot special committee secretariat by August 25;
3.GB/T16508 the sub-standard main author collected the views, modify the preparation of the draft (draft) on the basis of the draft text, submitted to the Shanghai International Industry pot special committee secretariat on September 30.
Technical characteristics: the overall cost of natural gas boiler is half the coal-fired boilers, and operation costs are four times as coal, a ton of steam needs to burn about 80 cubic meters of natural gas, and coal-fired no more than 0.185 kg, the economic accounts will be considered . Select the gas boiler it under certain conditions choice of last resort. As well as on the performance of the gas is better than coal. In principle, they are heat transfer equipment, the difference is that on combustion, complex grate or coal, coal preparation, etc. as well as coal needs, while gas only burner that simple. Use of cleaning gas boiler: boiler after a long run, the inevitable emergence of scale, mainly due to the scale of the problem of corrosion, formation of boiler feed water with hardness components, through subsequent high temperature and pressure continuously concentrated by evaporation in a furnace a series of physical and chemical reactions that ultimately form a hard heating surface, a dense scale, resulting in reduced heat transfer and the effect of corrosion under the scale factors, will result in reduced boiler waterwall furnace heat absorption, furnace outlet temperature of the boiler is increased, so that increased boiler losses. After scaling while reducing the heat transfer within the water wall, water wall tube wall temperature may lead to increased water wall lead to burst pipes, affect the safe operation of the boiler. The first of scale is detrimental boiler, the boiler is the main cause of accidents, the danger main problems: wasting a lot of fuel: Because only one of very few steel thermal conductivity of scale, so when the heating surface fouling will heat blocked, in order to maintain a certain boiler output, it is necessary to increase the temperature of the side of the fire, so that the external radiation and flue gas heat loss. Now it can be used efficient and environmentally non-corrosive cleaning agent gas boiler cleaning, cleaning Fu World Tektronix cleaning agent scale was completely dissolved, the equipment expose the metal tube primary colors, because the reduction of algae and biological sludge fouling effect. At the same time stripping the role of iron oxide and iron oxide Asia, extended gas boiler service life, reduce energy consumption and improve productivity.
Low NOx emission combustion boiler technology a boiler combustion boiler hypoxic hypoxia NOX emissions from combustion is the easiest way to control. And a combustion burner system does not need to make any changes, only control air flow into the furnace in operation, pulverized coal combustion process as close to the theoretical combustion air amount. Low oxygen combustion scheme can reduce NOX emissions by 20% to 30%. The program practical application subject to conditions. Low oxygen furnace, will increase the amount of unburned carbon, and more difficult for the flame of burning coal more obvious; Further, the CO concentration is also increased so that smoke, which will cause decreased boiler efficiency. Another problem is that for certain boilers, hypoxia causes the main combustion steam or reheat steam temperature is low. The burning coal to immediately, boiler efficiency and reduce the magnitude of steam temperature and other properties to determine the appropriate control value of flue gas oxygen furnace outlet (at or economizer) the specific embodiments. Second, air staged combustion technique combustion air into a plurality of strands, it is gradually mixed and pulverized coal combustion, so you can see the local area to reduce the air-fuel ratio, and the thermal decomposition of coal in the ignition phase, due to hypoxia, and thus the nitrogen oxide generation is suppressed. Air classification may be implemented within the combustor, the boiler can be completed within. 85% of the amount of air required for complete combustion is introduced to the main burner, the main burner combustion zone is insufficient oxygen for the fuel-rich conditions. Due to insufficient amount of oxygen, the flame temperature is low, the amount of nitrogen oxides to less generation of fuel nitrogen intermediates (e.g., NCH, NH3, etc.) will therefore not be oxidized NOX. Meanwhile, it has been possible to further reducing NOX generated in a reducing atmosphere to molecular nitrogen (N2 of), as a result reduces NOX emissions. An upper portion of the top floor is provided Ge overfire air (of OFA) spout into the furnace through which about 15% of the rest of the air, to avoid the high temperature flame zone, it is also possible to burn unburned carbon particles, to complete the combustion process.
The need for paper industry paper industry conversion of coal-fired boilers to gas boiler is a boiler equipment industry needs is more important, because a lot of links to the papermaking process requires a lot of steam drying, stereotypes and so on. However, along with the national policy of environmental protection departments to ban coal-fired boilers, and now more and more manufacturers have to use coal-fired boilers to coal-fired boilers upgrading or purchasing a new low - NOx emissions. Paper mill boilers from coal to gas fired boiler is an important direction of current reform, is one more type of enterprise transformation, especially in the area more natural gas, coal into gas boiler is the main way. 1, in order to transform mechanization layered fired boiler gas boiler, you should first remove the front arch and a rear arch, while increasing the bottom heating surface, instead grate, grate to prevent overheating, combustion; 2, through the furnace heat transfer calculation methods determining the size of the boiler, furnace flame center position, and then pouring furnace work. In order to avoid the center position after arch boiler tubes, based on the original slope of the original arch made pipe. 3, the furnace in order to prevent an explosion, when the coal-fired boiler furnace gas is substituted, or when fuel not atomized combustion gases in the furnace incomplete combustion or heating surface of the end of the furnace, a fire or explosion occurs, should be mounting the appropriate parts of the boiler explosion vent, and to increase the ignition and flame failure protection program control to automatic control means, to ensure safe operation of the boiler. 4, is closely related to the selection and arrangement of the burner and furnace, the filling degree of the flame in the furnace should preferably not to form a dead air. Gas burner arrangement considered reasonable and piping layout, easy operation, maintenance and inspection.
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