low pressure fire tube steam boilers manufacturers

Market Prospect of heating Boiler Control systemThe emission of pollutants such as smoke and dust caused by the combustion of boilers has seriously affected the atmospheric environment of our existence. With the development of computer technology and primary instrument technology, computer control boiler system has been greatly developed and improved, and has been widely used in the control of large, medium and small boilers. At present, the boiler microcomputer control system is mainly divided into two ways: distributed and centralized. Distributed type is mainly used in the control of large-scale boiler system, including: central microcomputer, field microcomputer, PLC and field instrument. Centralized for small boilers, including industrial control computers, peripherals, industrial automation instruments. Here, the adoption set The Chinese-style control system, which controls three four-ton water and steam stoves, is generally simple in structure and convenient in use. It is mainly composed of a hearth, a furnace, a superheater, a economizer and an air preheater. In terms of measuring parameters, there is generally a furnace temperature, which is composed of a furnace tube, a furnace, a superheater, a economizer and an air preheater. Furnace pressure, steam flow, circulation flow, exhaust temperature, etc. The industrial control computer is the core of the whole system, which is mainly used to manage the whole system and to control the boiler, organize the information, print the report form and alarm, and require a friendly man-machine interface. Can display the boiler timing flow and each parameter accurately, controls the boiler in the best condition operation. External equipment is industrial control The connection part between the computer and the field instrument is composed of the interface part and the actuator. The interface part mainly realizes the collection of the data collected by the external sensor, as well as the realization of the external control, including: violating the 12-bit AXD acquisition card, 8-way 8-bit isolated D / A card, cursed light isolation D / I card, break light isolation D / O card, I-turn template, relay board. The General Office of the State Council 26 issued the 2014-2015 energy conservation and emission reduction low-carbon development action plan notice. The notice calls for faster upgrading of coal-fired boilers. Investigation on energy consumption and pollution emission of boilers should be carried out. Implement energy saving and environmental protection synthesis of coal-fired boiler We will phase out 50, 000 small boilers in 2014, phase out 200000 tons of backward boilers by the end of 2015, promote 250000 tons of high-efficiency, energy-saving and environmental-friendly boilers, and comprehensively upgrade coal-fired boilers to dust removal. The coal-fired boilers with a capacity of 20 tons / hour or above have been completely reformed, resulting in an energy-saving capacity of 23 million tons of standard coal, a reduction capacity of 400000 tons of sulfur dioxide and a reduction of 100000 tons of nitrogen oxides.

The problems in low pressure fire tube steam boilers manufacturers operation and the start-up of magnetic driven centrifugal pump will encounter many problems, among which the main problems are low temperature corrosion, slow exhaust speed, steam and water supply pipe damage and so on. The low temperature corrosion occurred on the low temperature heating surface of steam boiler has several main points: chemical corrosion and electrochemical corrosion. These two kinds of corrosion occur basically on the wall at lower temperature than the acid dew point. Ash deposition on the heated surface of evaporation can sometimes accelerate corrosion. The reasons for the slow exhaust rate are as follows: outlet filter core obstruction; too small cross-sectional area or long pipeline of piping; filter mesh blocking at the inlet end; reverse stop The valve won't open. Solutions to this type of problem: replace the outlet filter core, replace the larger cross-sectional line, or shorten the distance of the line; clean the filter and install an air filter at the inlet; check the spring of the reverse stop valve. In addition, steam boiler is easy to appear steam, water supply pipe damage phenomenon: when the pipe leak slightly, make noise, insulation layer wet or leakage steam, dripping water. When the pipe blasting, make a significant noise, and spray steam, water. The change of steam or feed water flow rate is abnormal, the blasting site decreases before the flow meter, and after the flow meter, the flow rate increases. A drop in steam pressure or feed water pressure. When feeding jellyfish tube blasting In 2000, the water level of the operating furnace dropped. The main causes of these phenomena are: steam pipe overtemperature operation, creep expansion beyond the standard or running time too long, metal strength reduced. Steam pipe heating pipe is not sufficient, resulting in serious water shock. The poor quality of water supply results in corrosion of pipe wall. The local scour of the water supply pipe causes the wall of the pipe to be scrubbed. Abnormal operation of the water supply system, excessive pressure fluctuations, water shock or vibration. Bad installation, manufacture, material and welding. The solution is: if the water supply pipeline leakage is slight, can maintain boiler feed water, and does not expand the fault quickly, can maintain short-term operation, put into the spare boiler as soon as possible, if the fault is added Drama, a direct threat to the safety of personal or equipment, should stop the furnace. If the water supply pipe blasting, we should try to detach the faulty pipe section from the system as soon as possible, and if it cannot be unlined and unable to maintain the drum water level, the furnace should also be shut down. If the steam pipe leakage is mild and does not enlarge the fault quickly, it can be maintained for a short period of time and put into the spare boiler as soon as possible. If the failure aggravates, it should be shut down if the failure directly threatens the safety of the person or equipment. If the boiler steam pipe blasting, unable to supply steam or direct threat to the safety of persons and equipment, should also stop the furnace. In the case of steam pipe blasting, an attempt should be made to unlist the faulty pipe segment from the system as soon as possible.

To speed up solving air pollution prevention and control Liaoyang key and difficult issues, Liaoyang city government combined with the actual circumstances of the sky to win the Battle of implementation. Details are as follows.

1, promote clean heating. To proceed from reality, should the electric power, gas should the gas, the coal should be coal, should be hot is hot, warm winter to ensure the safety of the masses. In strict accordance with the "Notice on and of" (Municipal Office Liao Fa [2018] 19) requirements, minutes from the town to the countryside level steady implementation of clean coal-fired heating, natural gas heating in an orderly way, actively promote electric heating, heat pump heating scientific development, expansion of industrial waste heat heating, heating to accelerate improvements in the proportion of clean, implement the relevant provincial price policy, ensure the power supply. 2019 Clean heating rate should reach 44% in 2020 to clean the heating rate should reach 49%.

2, control total coal consumption. According to energy-saving emission reduction Work Leading Group Office of the City "on the issuance of Liaoyang control total coal consumption program of work (2018-2020 years)" (City of Liaoning Office Savings Fa [2018] No. 3), the city's total coal consumption do control. Vigorously for shutting down energy consumption, safety, environmental protection and other 300,000 kilowatts coal-fired units of non-compliance, capacity indicators for shutting down the unit, allowing the transaction or replacement, can co-ordinate arrangements for building the capacity of ultra-low emission coal-fired units. In 2020, the city's coal accounts for the proportion of total energy consumption control to 58.6% or less.

3, in-depth implementation of coal-fired boiler control. Increase the small coal-fired boilers (including coal-fired boilers and furnaces tea, operating the stove, grain storage and drying equipment, coal-fired facilities) elimination efforts. According to the principle of small demolition and Japan to promote clean energy use, developing the approach to co-ordinate the establishment and management of inventory ledger. Strengthen ecological environment, housing and urban construction, industry and information technology, market regulators linkage, strictly control new coal-fired boilers. 2018, 10 steam tons / hour (or 7 MW) coal-fired boilers and focus on the completion of the phase-out of county level and above all the urban area and old inefficient coal-fired boilers small tasks within the industrial park, small demolition boiler mission of 111; 2019, to phase out coal-fired boilers to further improve standards, expand the scope to promote the elimination of urban built-up area of ​​20 steam tons / hour (or 14 MW) and coal-fired boilers, in addition to special planning according to urban heating heating boilers other than essential to retain, urban built-up area 20 steam tons / hour (or 14 MW) coal-fired boilers to be eliminated and all.

4, the development of industrial furnaces governance special action. Development of industrial furnace remediation plan to carry out an intensive investigation, the establishment of various types of industrial furnaces inventory management. Increase the non-compliance of industrial furnaces out of efforts to speed up the elimination of small and medium gas furnace. Encourage industrial furnaces use electricity, natural gas and other clean energy or heat from the surrounding power plant. Key areas banned fired stove, the coal-fired cogeneration substantially eliminated heating pipe network coverage heated oven (furnace); out hearth diameter of 3 meters fuels gas furnace, a fixed bed to increase fertilizer industry intermittent coal gasifier reform efforts; focus on the use of gas furnace industrial park, they will not have to switch to natural conditions, should build a unified clean coal gas central principle; prohibition blended with high-sulfur petroleum coke. The industrial furnace governance as key tasks of environmental inspectors, who have not included in the list of industrial furnaces were included in the autumn-winter peak load shifting production program.

Natural water, even in seemingly pure tap water, contains a variety of dissolved salts, including calcium and magnesium salts. That is, the hardness material is the main source of scaling in low pressure fire tube steam boilers manufacturerss. Since scale is extremely harmful to steam boilers, removing hardness and preventing scale formation are the primary tasks of steam boiler water treatment, which can be achieved by chemical treatment outside the pot or dosing in the pot.

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