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features and advantages of low pressure steam boiler

Process cycle gas features and advantages of low pressure steam boiler and hot water circulation pump gas steam boiler with a heat exchanger can be achieved bathing and heating dual function. Natural circulation gas steam boiler, inlet and outlet are taken over from the top of the drum, the water from the water distribution pipe guide and drop into the front side lower header pipe, through the waterwall tubes heating rise. The front drum, rear end plate is provided with impermeable boundary falling rising flow, only the lower half of the drum cross-impermeable partition plate. For the forced circulation, the water access to the front end of the lower header, the front drum increases to upper waterwall tubes (waterwall downcomer Cancellation time), and then transferred to the waterwall tubes downcomer side to side lower header, then into the side of the cloth water wall tube rose to the drum, and from the front row convection bank down to the next drum, and finally between the upper and lower drum and several circuitous flow of water from the rear end of the drum. Hot gas steam boiler by circulating hot water tank insulation circulation pump, the hot water heating cycle tank, may be achieved bath object; circulation pump for circulating water through the hot water heating conduit, through the heat sink (radiator) can reach the people heating requirements.

The main heat exchanger is mainly produced by the Italian company Jia XX, other brands have similar technologies and processes, there is a certain amount of use in Europe. Made of 306 stainless steel, the domestic manufacturers had a laboratory test had the relevant parameters biased in favor of 304 stainless steel. Since the factory said to be 306, we tentatively called 306 stainless steel. The card Va, B license, A licensing other manufacturers are often employed in the form of the main heat exchanger. Analysis: Starting from such a main heat exchanger requires the production process. The plant on the 306 stainless steel pipe wall thickness 0.8mm disc commercially available machine, in a cylindrical disc type, pressure at both ends, the tube was compressed into oval tubes. Because of the longer tube can not be completely uniform scratch in the end, so that during the pressing process, there will inevitably be the case of a partial cut through the flat pipe, and insufficient local flat tube, resulting in uneven diameter, so the use of the segment (cell) method pressed. Such rejection rate is reduced, the yield can be improved, but also can be designed to a fixed power (8-10KW / section) of each cell. So you can always add and subtract the number of boiler according to design, adjust the power numbers. But this creates new problems, not butt weld between two units, one welding operation is no space, one is butt-welded seam is annular throughout the main heat exchanger, annular weld to half of the slit 900 in the barrel of a high temperature, to be in the half of the outer tub 200, and the same coefficient of expansion, we can not find a suitable welding consumables. Since not welded in series, so manufacturers using parallel method, several units in parallel in a sub-manifold, so that a four-way water warmed in the main heat exchanger, the problem is solved. As a result of the way just division multiple tube form, the diameter of each cell must be greatly reduced, thinner diameter, is about 30% of the normal section of the tube. In the water quality and good after-sales service in Europe, the use of relatively normal.

Cade Shopping Mall is located in central Shanghai Hongkou District, Shanghai Daily larger flow of people in the region. The introduction of Shanghai air pollutant emission standards, boiler flue gas emissions of nitrogen oxide emissions to less than 80 mg / m, Shopping Mall a coal-fired boilers have been used for many years, NOx emissions far super to this request, the urgent need to replace more environmentally friendly low nitrogen emission boilers. Other units through the use of fast Boiler introduction and understanding, determined and fast boiler to achieve cooperation, party fast to their specific needs to recommend one condensing gas hot water boiler of a 4.2MW for heating needs of the shopping center.

Three common boiler combustion boiler has its advantages and disadvantages in the field of comparison described power plant and uses a relatively large vessel, it is primarily an energy conversion device, its main role is to convert fuels to steam or high-temperature water. So what specific boiler burning it today is to introduce three common combustion boiler as well as their advantages and disadvantages:? Diffusion combustion Pros: This combustion is not pre-mixed, but the nozzle mouth the fuel gas interdiffusion, and then combustion. Combustion is relatively simple, relatively stable flame. Disadvantages: Due to a longer flame, it is prone to the phenomenon of incomplete combustion, will produce more carbon monoxide and nitrogen oxides, to the full use of the boiler fuel, to enhance the thermal efficiency boilers, and it is difficult to meet emission standards boiler. 2. The advantages of the premix combustion mode: premixing air and gas, the heat transfer multi-mode radiator, the intensity of heat transfer improvement. The advantage of using this method is that the combustion flame combustion clearer, and higher thermal efficiency. Disadvantages: the ratio of the premixed combustion in claim accurate fast burn rate, burn sufficiently uniform radiant heat transfer efficiency of the high flame temperature below 1200 deg.] C, all complete combustion gas temperature and NOx production low, condenses, good heat recovery and high efficiency. 3. A flameless combustion space before the combustion method of uniformly mixing the combustion gas with a gas boiler. When using this method, no need to obtain a gas in the air surrounding the combustion of oxygen required for the process, and only air mixture reaches the combustion zone to achieve complete combustion of the moment. These are the three common boiler combustion, combustion in the choice of the time required for combustion of different advantages and disadvantages, compared choose, because choosing a way to compare the earth to enhance the thermal efficiency, so choose a good combustion or more important.

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