A compact condensing fuel gas boiler with enhanced heat exchange cascade cooling

Abstract

The invention relates to a compact condensing type oil-gas boiler with the enhanced heat exchange and cascade cooling functions. The compact condensing type oil-gas boiler with the enhanced heat exchange and cascade cooling functions comprises a boiler shell, a boiler barrel and a boiler container which are sequentially arranged from outside to inside. The boiler container communicates with a backflash chamber. The backflash chamber communicates with multiple smoke pipes. The smoke pipes are arranged in the boiler barrel and located at the rear side of the backflash chamber. An airtight enhanced heat exchange pipe for first-level smoke cooling is arranged in each smoke pipe. A first water return pipe is mounted in each enhanced heat exchange pipe. The first water return pipes are connected with a water return device, and outlets of the first water return pipes are opposite to the inner side walls of the front ends of the corresponding enhanced heat exchange pipes. The rear ends of the enhanced heat exchange pipes communicate with the boiler barrel through water distribution pipes. A hot water or steam outlet is formed in the upper side of the front end of the boiler barrel. A first smoke chamber, a second smoke chamber, a three-level air condenser and a flue which sequentially communicate with one another are arranged between the boiler barrel and the boiler shell from front to rear. A second-level smoke cooler is arranged in the second smoke chamber. The smoke pipes communicate with the first smoke chamber. By the adoption of the compact condensing type oil-gas boiler with the enhanced heat exchange and cascade cooling functions, the temperature of smoke can be lowered effectively, the number of tube passes of the smoke pipes is reduced, and the occupied area is saved.

Description

technical field [0001] The invention relates to the technical field of fuel gas boiler equipment, in particular to a compact condensing fuel gas boiler with enhanced heat exchange cascade cooling. Background technique [0002] In the past ten years, the exploration and development of oil and natural gas have been vigorously developed across the country, and many oil and gas fields with large reserves have been surveyed. At the same time, the country also intends to introduce oil and gas resources from neighboring countries to increase oil and gas supply. In order to improve the environmental pollution and air quality of large and medium-sized cities, governments at all levels encourage enterprises and institutions to gradually replace coal-fired heating sources with fuel oil, especially gas, which undoubtedly once again promotes the development of oil-fired gas-fired boilers. In terms of its body structure, oil-fired gas-fired boilers can be divided into shell-type (fire-tub...

AI Technical Summary

Problems solved by technology

[0004] 2. Conventional shell-type boilers limit the deep condensation of flue gas due to the lack of cooling water sources; for domestic heating oil-fired gas boilers, the return water / outlet water temperatures are usually set at 70 / 95°C and return water at 70°C It is impossible to condense when the temperature is higher than the water dew point temperature. The designer needs to introduce cold water from outside the boiler system to condense the flue gas, but this part of the heat does not return to the boiler, and sometimes this part of the heat is wasted. To a certain extent, it does not improve the overall thermal efficiency of the boiler;

[0005] 3. Boiler modularization and integration are not enough; the lack of overall layout in the boiler design process leads to unreasonable planning of boiler auxiliary modules. Although some shell boilers also use single-return smoke pipes, in order to reduce the longitudinal length of the boiler, the condensation The heat exchanger is placed on the boiler shell, resulting in the emergence of a large number of backpack boilers on the market, or "Liu Luopan" boilers, whose appearance and size lack aesthetic feeling, and even spoil the scenery

Images