Cooling and condensing integrated gas water heater with low-nitrogen combustion

Abstract

The invention discloses discloses a cooling and condensing integrated gas water heater with low-nitrogen combustion. The gas water heater comprises a fan, a gas-air mixing chamber, a combustor, a combustion chamber, a heat exchanger and a smoke exhaust flow guide chamber from top to bottom. The heat exchanger comprises a plurality of heat exchange tube rows and water distribution boxes; and except that the water flow directions of heat exchange tubes in the lowest heat exchange tube row are the same, the water flow directions of adjacent heat exchange tube sets in the same heat exchange tube row are opposite, and the heat exchange tube sets are sequentially communicated end to end through the water diversion boxes at the two sides. Not only is NOx emission of the gas water heater effectively reduced, but also the smoke exhaust temperature is further reduced to be lower than the smoke dew point temperature through cooling and condensation integration, compared with the prior art, low-nitrogen-oxide smoke emission is achieved, well corrosion resistance is achieved, material consumption is reduced by 24-44% compared with an existing condensation type gas water heater, smoke resistance is reduced by 67-96%, and compared with a traditional cooling type gas water heater, natural gas consumption is saved by about 24%.

Description

technical field [0001] The invention relates to a gas water heater, in particular to a low-nitrogen combustion integrated cooling and condensation gas water heater, which belongs to the technical field of natural gas combustion and heating equipment. Background technique [0002] The flame temperature of natural gas combustion in gas water heaters is generally around 950°C, and a large amount of nitrogen oxides are generated during combustion. Water in the flue gas exists in the flue gas in gaseous form (water vapor). The latent heat of water vapor is about 11% of the low calorific value of natural gas. %. At present, the exhaust gas temperature of the mainstream cooling gas water heaters on the market is concentrated at 100°C-200°C. At this time, the water vapor in the flue gas tail gas has not yet condensed, so that the latent heat of water vapor and the sensible heat of exhaust gas at a higher temperature have not been obtained. Effective use, resulting in a lot of energ...

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Problems solved by technology

Chinese patent documents CN20140224661.8 and CN201410431156.5 also disclose a condensing gas water heater respectively. The common feature of their water heaters is that they directly add heat exchange tubes and drainage systems on the basis of traditional cooling heat exchangers, thereby increasing the Heat exchange area, although this solution achieves low-temperature emission of flue gas, but at the same time there are problems such as increased raw material consumption, increased cost, and increased volume of heat exchangers

In addition, the common problem of all kinds of existing gas water heaters is that the heat exchange tubes are connected by elbows. Scale accumulation is easy to occur at the elbows, which increases the resistance of the pipelines and even causes pipe plugging. The problem that adjacent heat exchange tube rows cannot be arranged compactly due to radius restrictions

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