The inlet speed of gas-fired hot-water boiler before start-up should not be too fast, usually no less than 4 hours in winter, and 2-3 hours in other seasons, especially in the initial stage of water intake. The inlet temperature of a gas-fired hot water boiler is generally 50 °C, so the difference between the feed water temperature and the steam wall temperature in the drum is less than 40 °C. For gas-fired hot water boiler, the inlet water temperature can be equal to that of steam drum wall without complete cooling, otherwise the inlet water speed should be slowed down. When feed water enters the drum, it always first touches the lower part of the drum. If the difference between the feed water temperature and the drum wall temperature is too Large, the inlet speed is fast, and the upper and lower walls of the drum, the inner and outer walls will have a large expansion. Bad, on the drum caused a lot of additional stress, resulting in drum deformation, serious cracking. Due to the thickness and slow expansion of the drum wall, the tube wall connected to the drum wall is thinner and expands faster. If the inlet temperature of the gas-fired hot water boiler is too high or the inlet speed is too fast, the expansion will be uneven, the welded joint will appear cracks and the gas-fired hot water boiler will be damaged. When feed water enters the drum, it always first touches the lower part of the drum. If the difference between the feed water temperature and the drum wall temperature is too large, the inlet velocity Fast, and the upper and lower walls of the drum, the inner and outer walls will have a large expansion. Bad, on the drum caused a lot of additional stress, resulting in drum deformation, serious cracking. Due to the thickness and slow expansion of the drum wall, the tube wall connected to the drum wall is thinner and expands faster. If the inlet temperature of the gas-fired hot water boiler is too high or the inlet speed is too fast, the expansion will be uneven, the welded joint will appear cracks and the gas-fired hot water boiler will be damaged. The inner diameter of the decompression tube is usually φ 7~13mm (water and steam), and its length should not be too long (< 60m). The diameter of the pressure pipe is too small and the length of the pipe is too long Long, will affect the dynamic transfer of pressure measurement, increase dynamic error. The inner diameter is too large to be easily maintained and installed. Pressure pipes should not be placed in the horizontal part to prevent the accumulation of bubbles (when measuring liquids) and water columns (when measuring gases). The flow of a pressure tap perpendicular to the medium. Pressure faucet must not have chamfer, flange and burr. When measuring the hydraulic pressure of an electrically heated steam boiler objective questions mcq and answers, the pressure outlet should be removed from the lower part of the pipe to prevent the gas in the liquid from entering the pressure guide pipe; When measuring gas pressure, the pressure splice should be removed from the upper part of the pipe to prevent dust and water droplets from entering the ignition line .
With the national energy restructuring and industrial upgrading, the government vigorously promote the use of clean energy such as natural gas. At the same time, atmospheric pollution and more attention, which allows a standard for nitrogen oxide emission concentration is increasingly stringent, stringent boiler air pollutant emission standards also facilitate improvements for manufacturers of low-nitrogen combustion technology development. This paper describes the domestic and international emission standards for nitrogen oxide gas boiler as well as common low NOx combustion technology.
Why washing plant washing plant uses steam boiler objective questions mcq and answers steam boiler Why? Automatic industrial washing machines, washing machines, dryers, ironing machine may not be required heating boiler, electric heating machines may be used. But few actually use electric heating washing plant dryer and ironing machine, but do not profit. Why washing plants use steam boilers? The main boiler steam to the washing apparatus. Industrial steam required automatic washing machines, dryers, need steam ironing machine. Automatic industrial washing machines need to use steam to heat the water, steam dryers need to be exchanged, steam is removed by the exhaust fan, to achieve the purpose of drying clothes. This machine requires steam to heat the drum, so that and duvet can be flattened and dried. Therefore, steam cleaning the factory plant essential equipment. Generating steam in two ways: one is to use an external source of steam, such as steam boilers, and the other is a washing machine using internal heating, i.e. electrical heating. However, the high cost of using electric heating, e.g. 100KG automatic industrial washing machines heating power of 60kW / h, i.e. 60kW / h per hour for one hour to 8 hours. To get 480 units of electricity, industrial electricity 1 yuan per kilowatt-hour, then 480 yuan per day, how much it costs, so from a cost point of view, the use of steam boilers Chen lowest cost.
Oriental Hawaii Holiday Hotel is located in Xiaogan City of Hubei Province in accordance with international five-star hotel standard design, set business rooms, SPA bath, foot care, indoor spa and other facilities in one of the hotel. Hot water boiler is one of the important facilities normal operation can not be separated. With the pace of Hubei Province in response to the national defense of the blue sky, the use of clean fuels gradually increase the proportion of Oriental Hawaii hotel provides visitors to the more perfect leisure experience a sense of the original wishing more polluted coal-fired boilers to replace clean and green gas-fired boiler. After comparing several vendors boiler industry, a number of R & D results very fast square value in the field of clean fuels, entered into a collaboration with the fast boiler. Fast boiler integrally provided a 1.4MW condensing pressure hot water boiler (CWNSL1.4-95 / 70-Y.Q) according to their actual needs. Put into use, fully meet the needs of Oriental Hawaii Holiday Hotel heating and hot water supply.
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