Full reverse convection unsealed water tube boiler

Abstract

The invention discloses a full reverse convection unsealed water tube boiler. Upper and lower center headers, laterally symmetrical water wall headers, a water wall tube, upper and lower laterally symmetrical convection bank headers, a convection bank, front, rear, upper and lower transverse headers, communicating tubes and the like are respectively communicated to form a radiation convective heating surface and a natural circulation water channel; furnace walls are constructed on the outer side of the water wall and the outer sides of a ceiling and the convection bank to form a hearth and a three-return flue, so that the volume of the hearth can be increased with the same boiler volume to facilitate fully burning and settling dust in a soot furnace; the water channel and a soot channel are subjected to full reverse convection transverse washing to facilitate improving the heat exchange effect and reducing soot formation on the convective heating surface; and because of an unsealed structure, the natural circulation is safe, reliable and small in flow resistance, the overall structure process is advanced, the manufacturing is simple, and large, medium and small tubes can be adopted to replace drums of various boilers, so the steel consumption can be reduced by 30 percent, the manufacturing efficiency can be improved by 40 percent, the power consumption can be reduced by 20 percent, the initial discharge concentration of the soot can be reduced by 70 percent; therefore, the boiler has obvious advantages of energy saving, consumption reduction and emission reduction.

Description

technical field [0001] The invention belongs to the field of thermal energy engineering, in particular to a direct-supply small and medium-sized central heating hot water boiler. Background technique [0002] At present, the total number of industrial boilers in use in my country is about 500,000, and only ≤20t / h accounts for 90% of the total capacity, of which hot water boilers account for about 50%. A resource-saving society and an environment-friendly society have important influences. [0003] At present, the popular small and medium-sized hot water boilers in the market are all equipped with drums. Due to the large diameter and wall thickness of the drums, the steel consumption is high and the manufacturing cost is high. Because the drums of ≤ 20t / h are all shipped from the factory or separated After leaving the factory, the space occupied by the large drum makes the volume of the furnace smaller, which is extremely unfavorable for the full combustion of fuel in the fur...

AI Technical Summary

Problems solved by technology

[0003] At present, the popular small and medium-sized hot water boilers in the market are all equipped with drums. Due to the large diameter and wall thickness of the drums, the steel consumption is high and the manufacturing cost is high. Because the drums of ≤ 20t / h are all shipped from the factory or separated When leaving the factory, the space occupied by the large drum makes the volume of the furnace smaller, which is extremely unfavorable for the full combustion of fuel in the furnace and the settlement of smoke and dust in the furnace, which increases the carbon content of fly ash and the original emission concentration of smoke and dust

Although the tube-frame hot water boiler that was popular in the market has obvious advantages of low cost and easy to increase the furnace volume, it has many disadvantages. The power consumption of the circulating pump is increased. Second, partitions need to be installed in the header. Once the design and installation position of the partition is wrong, it is easy to cause a tube explosion accident, and it is difficult to find the fault point. It is difficult to maintain. First, there are strict requirements for power failure protection management. Once the operation is wrong, it is easy to cause boiler accidents. Fifth, there are many exhaust and sewage points, and the operation and management are complicated.

Although the boiler disclosed in the patent of invention with the application number 200610057234.5 has the advantage of natural circulation compared with other closed tube frame boilers, there are still many defects in the structure, some of which are even serious defects, such as the first The rear end of the lower central header protrudes out of the rear wall and there is no hand hole. Once the scale cannot be completely removed, the second is to arrange only two connecting pipes with the upper and lower central headers, which may affect the safe operation due to uneven water circulation. The third is The vertical section of the three-pass flue gas inlet (flue gas corridor) section is low and the vertical length is long, which is easy for the flue gas to short-circuit and is not conducive to the heat transfer of the convective tube bundle. The power consumption of the fan, the fifth is that there is no ash hopper at the bottom of the smoke box and the ash accumulation cannot be removed

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