To further promote the comprehensive management of coal-fired boilers, Jincheng City, Shanxi Province, according to "Jincheng Blue win the Battle of three-year action plan" requirements, plans to complete 109 units of 10-20 tons of steam "small coal-fired boilers" within this year the phase-out, at the same time, Jincheng will start working out of 35 tons of steam coal-fired boilers.
This year, Jincheng counties (cities, districts) the environmental sector will urge the relevant enterprises and institutions to eliminate the basis of 10 tons of steam and coal-fired boilers on in 2018 to accelerate the phase-out and 20 tons of steam coal-fired boilers. This year, the city to complete 109 units (10-20 tons of steam boilers) working out of a total of 589.5 tons of steam boilers; at the same time, Jincheng will also speed up the foundation and 20 tons of steam coal-fired boiler out, start 35 tons of steam phase out coal-fired boilers, in principle, within the city's new domain-wide 35 tons of steam coal-fired boilers.
In addition, Jincheng will accelerate the transformation of ultra-low emission. Before the end of September this year, the city will complete 52 units (65 tons of steam per hour and higher coal-fired boilers) coal-fired heating boilers ultra-low total of 4530 tons of steam boilers transformation, and the county (city) built-up area, biomass boilers emissions transformation. After transformation, under condition of the reference oxygen content of 6%, soot, sulfur dioxide, nitrogen oxides emission concentration of these boilers respectively not higher than 10 mg / m, 35 mg / m and 50 mg / m.
Transformation of low nitrogen in the combustion aspect, before the end of October, Jincheng station 610 will complete the transformation of low-nitrogen combustion Total 1940.15 tons of steam gas boiler, after completion of the transformation, the boiler NOx emission will not exceed 50 mg / m.
Electric boiler supplying domestic matters need to pay attention what? 1, electric boiler carefully check each system before opening oven parts electric boiler, focused on checking the three security controls pressure gauge, safety valve, gas pipe fittings, water level is normal, everything is correct, put on compliance clothing to continue to work. Electric 3 ton industrial steam boiler 2, please do one-handed operation when the water in the electric boiler, water regulatory action is single-handedly opened the door in one hand and a water injector steam valve, when the water column to a predetermined level, the first valving (valving time face not being on the water, to prevent splash injuries face) and then turn off the water gate, electric boilers provide domestic water to be alert order can not be reversed. When electric boiler work, surrounding someone must guard the moment the water level and pressure gauges, there can be no neglect of duty, to adjust work schedules when working at night, night shift work, be sure to have a good rest during the day, not at night when this work I would doze off, because if there is any carelessness, accidents will happen. Points to note what? 4, electric boilers night to the boiler daily sewage treatment, water table should clean up once every night. For motor and other mechanical equipment have always been its inspection, if any abnormal findings, the investigation must be immediate. Weekly safety valve should be checked whether it is safe.
What are the overall structure of the boiler boiler structure includes two major boiler and auxiliary equipment. Boiler furnace, drum, burner, water wall superheater, economizer, air preheater, and the furnace wall, etc. The main frame member constituting the core part of the steam production, called boiler. Boiler body is in two main parts and drum furnace. Also known as the furnace combustion chamber, fuel combustion for space. The solid fuel on to the grate, referred to as a fire bed combustion furnace Stoker, also known as fire bed furnace; solid fuel furnace liquid, gas or pulverized, is injected into the combustion chamber is called the fire chamber burner, also known as the furnace fire chamber; air coal particles burn hold it was boiling, and the furnace is inferior fuel suitable for combustion is called fluidized bed furnace, also called fluidized bed furnace; coal particles so that an air flow rotated at high speed, and strongly called fire cylindrical cyclone furnace hearth. The furnace cross-section is generally square or rectangular. Combustion fuel to form a flame in the furnace and high temperature flue gas, so the hearth around the furnace wall is made of refractory material and insulation material. On the inner surface of the wall of the furnace waterwall tubes often laid, it will not burn both protect the furnace wall, and absorb a large amount of radiation heat of the flame and the high temperature flue gas. Furnace design needs to fully consider the characteristics of the fuel used. Each boiler should be fueled with the original design of the fuel. Boilers running economy and reliability are likely to vary greatly reduced when using the characteristics of fuel combustion. And the natural circulation drum is repeatedly forced circulation boiler receiving feedwater to the economizer, the coupling cycle and supplying saturated steam superheater cylindrical vessel. Simplified drum made from high quality steel plate, is one of the heaviest components of the boiler. The main function of the water storage drum, a steam separator, brine and water excluded pot sludge in operation, to avoid the boiler water containing a high concentration of salt and impurities entering with the steam superheater and a steam turbine. Internal drum means comprises a moisture separator and a steam cleaning apparatus, water distribution pipes, sewage and dosing equipment. Wherein the effect of soda is separated from the water wall by means of saturated steam and water to leave, and to minimize the steam carried fine water droplets. Low pressure boiler used as a crude flap and slit baffle separating element; above except pressure in the boiler is widely used for various types of rough separation cyclone, but also with blinds, steel mesh plate or the like are vapor further separation. The drum is also equipped with water gauges, safety valves and other monitoring and protection facilities. In order to improve the design and performance assessment, often have to go through boiler thermal balance test. Direct methods to calculate the thermal efficiency of the boiler is called n-efficient use of energy balance, the heat loss from a variety of methods to counter the counter balance called computational efficiency. When considering the practical benefits of the boiler room, boiler thermal efficiency not only look, but also taking into account the energy consumed by the auxiliary boiler. Fuel per unit mass or unit volume of complete combustion, calculated according to the chemical reaction called the theoretical air quantity of air required. In order to have more opportunities to the fuel in contact with oxygen in the furnace combustion, the actual amount of air into the furnace is always greater than the theoretical air amount. While air can be reduced into a multi incomplete combustion heat loss, but the heat losses will increase, also exacerbate corrosion of sulfur oxides and nitrogen oxides generated. We should therefore seek to improve combustion technology, as small as possible in order for the excess air ratio in the furnace so that complete combustion. Dust contained in the boiler flue gas (including carbon black and ash), sulfur and nitrogen oxides are air pollutants, which can achieve emissions targets environmental regulations when unpurified indicators several to several tens of times. These substances emissions control combustion pretreatment, improved combustion techniques, dust removal, desulfurization and denitration. By means of a high chimney stack can reduce the concentration of pollutants in the atmosphere of the area. Flue gas dust removal force used gravity, centrifugal force, inertial force and acoustic adhesion, static electricity and the like. Is generally used for separating coarse particles gravity settling and inertial force, centrifugal separation is often used dust bag filters and electrostatic precipitators having a high dust removal efficiency at higher capacity. Wet venturi - water film adhering water film droplet precipitator ash, high collection efficiency can absorb gaseous pollutants. Since the 1950s, people strive to develop the comprehensive utilization of ash, harm into. The manufacturing cement, bricks and building materials such as concrete aggregate ash. Since the 1970s and from the fly ash cenospheres extracted as a fire-resistant insulation and other materials. Future development will further improve boiler thermal efficiency of boilers and power plants; reduce equipment cost per unit of power boilers and power plants; enhance operational flexibility and level of automation of the boiler unit; develop more varieties to suit different boiler fuel; and improve boiler unit the reliability of operation of the auxiliary equipment; reduce environmental pollution.
Matters needing attention in loading and installation of Gas-fired Steam Boiler
Gas-fired steam boilers are a very wide range of special equipment, usually built in boiler rooms. However, in the process of loading and installation, some problems must be paid attention to, otherwise it may cause a certain degree of economic loss.
1. Pay attention to the following matters during the loading and unloading and handling of gas-fired boilers: the lifting capacity of the lifting equipment should match the weight of the lifting boiler. The lifting lug on the boiler with the lifting lugs that cannot be used for lifting can not be used for lifting. The length of the steel cord should be reasonably selected to avoid the scratching of the furnace due to the improper length of the steel cord. The boiler must be protected from any damage during handling and handling.
2. Reserves for maintenance space When installing boilers, ensure that there is sufficient maintenance space around the boiler.
3. Setting and precautions for the base and base of the gas steam boiler The boiler body must be installed on the basis of 100-150mm above the floor of the boiler room. It must be confirmed with the technical personnel of the boiler manufacturing company in advance and constructed according to the basic drawings. The anchor bolts must be reserved on the foundation. The foundation shall be capable of withstanding the maximum weight of the boiler and the amount of water it holds. When installing the base, you must first position it. After positioning, adjust to the same length of the two diagonals of the base, and then tighten all the fixing bolts. The installation of the base is carried out with reference to the reference line.
4, general precautions Be careful not to tilt and impact the boiler and accessories too much. No combustibles can be placed around the boiler. Do not use oil and water to smother the boiler. The boiler should normally be installed in a separate boiler room. The new gas-fired boiler room should not be connected to the house. The boiler room shall not be connected to Class A, Class B and Category C fire hazard rooms using flammable liquids. If connected to other production plants, the application firewall is separated.
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