steam boiler working principle pdf

First, the main purpose of the gas pressure hot water boiler

1, bath

Gas-fired boiler feed pump selection method! Water pump is the main equipment of gas-fired boiler, which is mainly used to replenish water of boiler to meet the normal water demand of boiler. The type selection of water pump mainly determines its flow rate and head. The specific introduction is as follows: 1, the flow calculation of feed pump: Q = k (Q1Q2): the flow rate of Q-boiler feed pump, m3 / h; Q1-Total water supply at maximum steam load for boilers, m3 / h; Q2-other water consumption, such as continuous discharge, periodic discharge and thermostat, m3 / h; k-standby factor 1. 1 ~ 1. 2.2, calculation of feed pump head of gas-fired boiler: h = H _ 1 H _ 2H _ 3H _ 4: h-boiler feed pump head, m; H _ 1-boiler opening pressure of safety valve under designed pressure, MPa; Resistance of H _ 2-economizer and water supply pipeline system, MPa; H _ 3-difference between the highest and lowest water levels of the water supply system, MPa; H _ 4 & mdash The other. 3, the gas-fired steam boiler working principle pdf feed pump shall be provided with a reserve, and when the maximum feed pump stops operating, the remaining total flow rate shall be able to meet 110% of the water supply required by all operating boilers at the rated evaporation capacity; When the boiler room is equipped with a dewarming device or a heat accumulator, the total flow rate of the feed pump shall be included in its water consumption. 4. One or more boilers with the same steam pressure may choose to operate side by side with two or more feedwater pumps, if the main pipe is used for water supply, Then you can choose two pumps and one backup, then frequency conversion water supply, which not only reduces the consumption of electric energy, but also makes the water supply pressure stable, although the one-time investment is relatively large. However, by means of frequency conversion and energy saving measures, the investment cost can be recovered in 3 years and 4 years. 5. Gas-fired steam boilers use steam-driven feedwater pumps as accident backup pumps. Its flow rate should be able to meet 20% ~ 40% of the water supply required by all operating boilers at rated evaporative capacity. Only when the boiler room with the first-class electric load and the feed pump stop running will not cause the boiler to be short of water, the steam-driven feed water pump may not be installed, and the non-power boiler room of the general industrial enterprise does not have such conditions, so it must be set up. Boiler selection has a direct impact on the boiler water supply system, it should be carefully selected.

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.

Our company got two patents on this boiler design, the flying dust internal cycling fluidized re-combustion device bosed on the high temperature separation technology; the combined design of equal flow speed for the flag type convection heating surface of corner tube boilers. We carried out independent innovative design so as to produce the high capacity energy saving chain grate boilers with advantages of reliable water cycling, efficient burning and low pollution.

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