WNS oil

Recently, we learned, Shaoxing City, Zhejiang Province People's Government Office issued the "coastal city 2018--2019 autumn and winter tackling air pollution comprehensive management action plan", as follows.

Less adopt comprehensive measures to reduce coal total coal consumption, coal consumption in 2018 to ensure that the total amount of negative growth. New non-owned coal-fired units, the implementation of new large-scale coal-fired units and coal consumption capacity equal or reduction alternative.

Optimize the use of natural gas structure, in principle, to new natural gas cogeneration and gas chemical projects, gas will adhere to the reform, orderly manner "coal to gas" project.

Carry out boiler (with tea furnace, operating a stove, grain storage and drying equipment, coal-fired facilities) an intensive investigation to establish accounting and inventory management, to develop a comprehensive remediation program in accordance with the unified deployment requirements boiler city, according to the law in accordance with regulations to increase fuel coal boiler out of efforts to achieve all cleared 10 steam tons / hour and coal-fired boilers to prevent high-polluting fuel boiler rebound has been eliminated. Boiler registration strictly prohibit new steam per hour 35 tons / hour of coal-fired boilers, coal-fired boilers new emission concentration to meet ultra-low emission of air pollutants, strict control of new biomass boilers, coal-fired boilers embodiments and low nitrogen urban built-up area of ​​ultra-low emission biomass boilers transformation.

A maintenance work, steam wns

Food industry is well known both regionally and internationally and is one of the strong points of the economy in Serbia. ASME steam wns in Serbia can be applied in other realted industry such as biscuit factory, sugar industry, beer factory, dairy, etc.

Gas-fired wns 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 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.

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