In the national standard of water quality standard, the water quality index of hot water fired water tube boiler cost stipulates that the total hardness of water supply for chemical treatment outside furnace is less than 0.6 mmol / L. In recent years, in order to reduce the operating cost of heating units, some hot water gas-fired steam boilers have been overloaded due to the use of class Ⅲ bituminous coal as fuel instead of class Ⅱ bituminous coal designed to replace the designed type Ⅱ bituminous coal. During the maintenance in summer, it is found that the overloading boiler water wall tube fouling problem is more prominent, some boilers even occur tube burst accident. Why is heating hot water boiler overloaded, scale and even burst tube? Because the calorific value of class Ⅲ bituminous coal is higher, the type Ⅲ bituminous coal of the same weight is burned instead of the designed class Ⅱ bituminous coal. Bituminous coal increases the circulation of boiler riser is not absolute equilibrium, the geometric difference of riser and the heat load are different, so there is inevitably the deviation of flow rate between the risers. Due to the overloading operation of the boiler, some riser tubes are easy to overheat boiling because the flow rate is small, and the wall temperature is higher than the designed wall temperature, so that the scale and even the tube burst are easy to occur. How to prevent the boiler from scaling when overloaded? The heating hot water boiler operates under overload because of the scaling after the superheated boiling. Steam is produced in the process of superheated boiling. The water quality requirement of gas steam boiler is less than 0.03 mmol / L, which is much lower than that of hot water boiler. Water quality requirements. Based on the above reasons, the feed water hardness of heating hot water boiler is reduced, and the scaling phenomenon is eliminated by reducing 0.6mmol/L to 0.03mmol/L.
Steam fired water tube boiler costs What is the function? Too many in the form of steam boilers, would like to give a quick four tons of ordinary steam boiler talk. Water in the steam drum is heated to become vapor, fire emits heat in the furnace, it is the principle of the steam boiler. Let me say a boiler pot. This boiler is a boiler drum with a water cooling wall at about the subregional arrangements drum pyrotechnic two return pipe, before the folded portion of the drum front smoke box. Between the drum and the tank in connection with the downcomer tubes and water-cooled bi, constituting the frame of the combustion chamber. There upper steam separator drum to reduce the water vapor out of the tape. Pan heating surface of a lower portion of the drum, and the water cooling pipe bi pyrotechnic tube. A chain grate combustion section and drive means, coupled with the combustion chamber pan rack on the frame configuration composed of the grate. Four weeks envelope refractories. . From coal fired into the hopper, the shutter coal front portion while sealing air control seam thickness. Blast into the lower part of the combustion chamber is a place that boiler greater resistance, need to force the blast. Cinder burn out, through the grate in the rear portion of the olecranon iron discharged from the machine to send out of the furnace slag. The boiler flue gas from the rear, by the front drum smoke tube a return line, the return from the two rear return smoke tube, and then into the dust separating ashes, and then discharged through the chimney draft fan. Not only is the induced draft fan exhaust fumes, the negative pressure of the boiler operation is required. Steam boiler pressure vessels, safety devices is necessary. Boiler necessary water level gauge, pressure gauge, safety valve, thermometer, and under the pressure of the electric pump can pay, and the vapor pump when power is off can also be used. Boiler water must be softened, as well as water treatment equipment.
Recently, Taiyuan, Shanxi Province Environmental Protection Leading Group issued a circular on promoting the transformation of ultra-low emissions and low nitrogen transformation of biomass fired water tube boiler costs gas-fired boiler. Resolutely implement - the latest requirements "2018 in Beijing, Tianjin and the surrounding areas in 2019 autumn and winter tackling air pollution comprehensive management action plan" in, and further reduces boiler emissions standards.
Located in urban construction area of biomass boilers to complete the transformation of ultra-low emissions at all before 31 October 2019. After the transformation to achieve ultra-low emissions coal-fired power plants. 6% of the oxygen content of the reference, soot, sulfur dioxide, nitrogen oxides emission concentration of not more than 10,35,50 mg / m. Rear of the boiler can be installed efficient dust removal, desulfurization apparatus or stock updates Ultra Low NOx emissions (nitrogen oxides emission concentration is not higher than 30 mg / m3) gas boiler or an electric boiler.
December 31, 2015 installation of ultra-low nitrogen gas boiler to complete the transformation of the October 31, 2019, after the installation of gas boilers used to complete the transformation of the ultra-low nitrogen October 31, 2020. After transformation of nitrogen oxide emissions concentration up to 30 mg / m. District heating gas boiler discourage updated low nitrogen burners, home improvement flue gas recirculation device to transform the way, is updated to encourage direct ultra-low nitrogen emissions boiler.
A gas fired water tube boiler cost comprising a monitoring system that parts (1) capture the state of various equipment and system status; and (2) control the boiler and the various actuators. State acquisition device is mainly a state of the output point of the boiler, a circulation pump status point state point and given water supply pump, as well as tanks and other equipment. State point boiler including the boiler operating state point, the state point level tank, boiler fault state point, the boiler water temperature, return water temperature of the boiler, the boiler exhaust gas temperature; circulating pump, supply pump and an electric auxiliary control valve which state point frequency devices work. State acquisition system is divided into primary and secondary sides. A water circulation system between a primary side of the boiler to the heat exchanger, the secondary side to the water circulation system is mainly refers to the end of a heat exchanger circulation system. Acquired primary side water temperature state comprises a primary side, primary-side return water temperature, water pressure on the primary side, the primary return pressure, smoke and combustion temperature and the state of the working machine tank level,; the state of the secondary side includes a secondary collection side water temperature, return water temperature of the secondary side, the secondary side water pressure, the secondary pressure backwater; an outdoor temperature collection can automatically control monitoring system according to the outdoor temperature boiler. Boiler control the various actuators and control of the main boiler and stops the control of various electric valve. The boiler room various devices, instruments, sensors, actuators and communication module line monitoring system to achieve automatic control of the boiler room by performing data acquisition and control functions of the boiler room and other field devices, safe start-stop units, reached unattended.Free Chat
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