Combustion system of high-power capacity type gas water heater and combustion method thereof

Abstract

The invention discloses a combustion system of a high-power capacity type gas water heater and a combustion method thereof. The combustion system comprises an air inlet and a smoke outlet, a channel from the air inlet to the smoke outlet is a single communication channel which is internally provided with at least one combustor, at least one primary air channel, at least one combustion space, at least one secondary air channel, and secondary combustion spaces, wherein the combustor is internally provided with the primary air channel used for introducing the air into the combustor to mix with fuel gas in the combustor to generate primary mixed gas, the combustion space is used for the primary mixed gas of the combustor to combust to generate at least a primary flame, the air guide direction of the secondary air channel points to the periphery of each primary combustion space, and air in the secondary air channel supports the primary flame through the secondary combustion spaces. The combustion system is characterized in that the single communication channel is internally further provided with an air supplement channel internally provided with an air distribution device, wherein the air guide direction of the air supplement channel points to the peripheries of all the secondary combustion spaces. The method can guarantee the complete combustion of fuel gas under the condition with smaller air quantity, with stable combustion, and compared with the prior art, a combustion vibration area is obviously reduced.

Description

technical field [0001] The invention relates to a gas water heater combustion system and a combustion method thereof. Background technique [0002] The combustion system commonly used in volumetric gas water heaters is a non-closed partial premixed combustion system. This combustion system generally uses a cast iron disc burner. Due to the inherent characteristics of the non-closed combustion system, the volumetric water heater using this combustion method generally has an output load of It is small, and it takes more than 1 hour to recover after the water is used up once. Once the input power of this burner is increased, more combustion-supporting air and a larger combustion space are required, which is obviously beyond the capability of this spontaneous air supplementation method. [0003] The combustion system commonly used in instant gas water heaters is a closed partial premixed combustion system. This combustion system is generally placed in the lower part of the finn...

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Problems solved by technology

[0004] However, this type of volumetric gas water heater generally uses cast iron coils immersed in the water tank as the heat exchange system. Features, in product design, in order to control the emission level of pollutants such as CO, it is necessary to provide an air volume much larger than that required for theoretical combustion, that is, the excess air coefficient must be much greater than 1, and the excess air coefficient usually designed is as high as 1.8 to 2.5 (that is, the ratio The amount of air required in theory is 80% to 150% more), so this system has high requirements for fan capacity

And once it is necessary to increase the heat exchange area to improve thermal efficiency, the cast iron coil must be lengthened, so that the air volume of the fan that provides the air required for combustion will decrease due to the increase in static pressure, which will cause incomplete combustion and increase CO

In this case, it is generally necessary to reduce the combustion load to ensure the combustion condition of the system, but the reduction of the combustion load means that the recovery time of the volumetric gas water heater will increase, and if a fan with a larger capacity is used to ensure complete combustion, it will not only lead to The cost of the system increases, and in the case of combustion with a large air volume, the test found that it is easy to generate unstable combustion such as combustion vibration, which leads to potential safety hazards of the system

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