CN201339977Y - Household gas oven with function of flue gas recirculation - Google Patents

Abstract

The utility model discloses a household gas stove with flue gas recirculation. The gas nozzle is connected with the furnace head through an ejector; the furnace head is located in the combustion chamber formed by the furnace wall; There is a flue exhaust duct and a secondary air duct. There is also a turning angle in the combustion chamber. A recirculation flue is formed between the turning angle and the furnace wall at the opposite end of the ejector. The recirculation flue is connected to the flue exhaust duct at the upper end of the combustion chamber. , communicate with the secondary air duct and the mixing air duct at the lower end. The utility model utilizes the density difference of the flue gas after combustion to realize the self-circulation of the flue gas in the furnace, and reduces the heat loss of the incomplete combustion of the gas in the combustion chamber and the physical heat loss of the flue gas emission. It has a simple system and low heat loss. At the same time, it can reduce NOx emissions through high-temperature and low-oxygen combustion, achieving the effect of high-efficiency and low-pollution combustion of gas.

Description

A domestic gas stove with flue gas recirculation

technical field

The utility model relates to a gas stove, in particular to a household gas stove with flue gas recirculation.

Background technique

At present, most of our households are atmospheric stoves, and their combustion adopts a partial premixed combustion method. Part of the air can only complete its basic combustion. Burn completely. In this partly premixed air combustion method, the ejector naturally injects air into the burner cavity through the gas pressure. The flame temperature of the gas combustion is only about 700°C-800°C. This air mixing method and the combustion flame temperature make the atmosphere Type stoves have certain incomplete combustion losses.

Atmospheric cookers heat the pan on the cooker through flue gas radiation and convection heating. This heat transfer method will cause large physical heat loss due to the high temperature of the flue gas and the lack of residence time.

The above reasons make the thermal efficiency of the atmospheric cooker only slightly greater than 50% (national standard).

Utility model content

The purpose of the utility model is to overcome the disadvantages of the prior art, to provide a household gas stove with simple structure, small heat loss, which can reduce NOx emission through high-temperature and low-oxygen combustion, and achieve the effect of high-efficiency and low-pollution combustion of gas.

The utility model is achieved through the following technical solutions:

A domestic gas stove with flue gas recirculation, the gas nozzle is connected to the burner head through an ejector; There is also a steering angle in the combustion chamber, and a recirculation flue is formed between the steering angle and the rear wall of the gas furnace. The recirculation flue is connected with the exhaust flue at the upper end of the combustion chamber and connected with the second The secondary air duct is connected with the mixed air duct.

The combustion chamber preferably adopts a box-shaped structure composed of furnace walls.

The furnace wall inside the combustion chamber is preferably made of white high temperature resistant ceramic material.

Compared with the prior art, the utility model has the following advantages and effects:

(1) The combustion chamber of the utility model adopts a relatively closed furnace structure, which is beneficial to reduce heat loss, and there are white high-temperature-resistant ceramic materials in the combustion chamber, which can reflect heat and reduce heat dissipation, maintain a high furnace temperature, and reduce incomplete combustion losses .

(2) The utility model is provided with a turning angle in the combustion chamber to form a recirculation flue with the rear furnace wall, and the combustion chamber is provided with a flue exhaust duct and a secondary air duct communicating with the outside world to realize the recirculation combustion mode. The way is to use the gravity pressure difference formed by the temperature difference of the flue gas to realize the self-circulation of part of the flue gas, and use part of the waste heat of the flue gas to reduce the physical heat loss and improve the thermal efficiency.

(3) The utility model also reduces the oxygen concentration in the combustion chamber through recirculation combustion, thereby reducing the generation of NOx in the combustion process and reducing environmental pollution.

Description of drawings

Fig. 1 is a schematic structural diagram of a domestic gas stove with flue gas recirculation.

Shown in the figure: 1-gas nozzle 2-ejector 3-furnace head 4-furnace wall 5-combustion chamber 6-pot platform 7-steering angle 8-exhaust flue 9-recirculation flue 10-rear furnace wall 11 -Secondary air duct 12-Mixed air duct

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described further.

As shown in Figure 1, the household gas stove with flue gas recirculation of the utility model is a box-shaped structure, including a gas nozzle 1, an injector 2, a burner 3, a furnace wall 4, a combustion chamber 5, and a pot platform 6. Turning angle 7, exhaust flue 8, recirculation flue 9, rear furnace wall 10, secondary air duct 11 and mixing air duct 12. The gas nozzle 1 is connected to the burner 3 through the injector 2 , and the burner 3 is located in the box-shaped structure combustion chamber 5 formed by the furnace wall 4 . The combustion chamber 5 is located at the opposite end of the ejector 2 and is provided with a flue exhaust duct 8 and a secondary air duct 11. A steering angle 7 is also provided in the combustion chamber 5, and the steering angle 7 is connected with the furnace walls 4 on the front and rear sides, and is connected with the induction chamber 5. A recirculation flue 9 is formed between the furnace wall 4 at the opposite end of the injector 2, and the recirculation flue 9 communicates with the flue exhaust duct 8 at the upper end of the combustion chamber 5, and communicates with the secondary air duct 11 and the mixing air duct 12 at the lower end. The secondary air duct 11 is connected to the mixing air duct 12, and the mixing air duct 12 is connected to the burner 3 in the combustion chamber, so that the secondary air is in contact with the outside of the burner.

The domestic gas stove with flue gas recirculation forms a gas premixed combustion system, a flue gas exhaust and recirculation system, and a secondary air and diffusion combustion system. The gas from the gas nozzle 1 of the gas premixed combustion system enters the ejector 2, which is connected to the burner 3 and placed in the combustion chamber 5. After combustion, the flue gas releases heat to the pot on the pot platform 6. Flue gas exhaust and recirculation system, part of the high-temperature flue gas is introduced into the exhaust duct 8 after the steering angle 7 and discharged, and the other part is sent back through the recirculation flue 9 and the mixing air duct 11 between the steering angle 7 and the rear furnace wall 10 In the combustion chamber 5. In the secondary air and diffusion combustion system, the secondary air duct 11 is connected to the mixing air duct 12, and the mixing air duct 12 is connected to the combustion chamber 5. The formed secondary air contacts the outside of the burner 3. Since the secondary air at this time is high temperature and low Oxygen and air can realize efficient and low-pollution diffusion combustion of gas.

The furnace wall 4 inside the combustion chamber 5 is a white high-temperature-resistant ceramic material, which has a heat reflection function, can reflect heat and reduce heat dissipation, and keep a higher furnace temperature. A pot for cooking can be placed above the pot platform 6.

The combustion chamber 5 that the furnace wall 4 of the utility model constitutes can also be designed into other relatively closed other shapes that are convenient to use except adopting the above-mentioned box-type structure.

When in use, the gas with pressure is ejected at a high speed from the gas nozzle 1, and under the action of the ejector 2, the air is sucked once, so that the gas forms a premixed combustion in the burner 3, and the burner 3 is placed in the combustion chamber 5, and the combustion chamber The furnace wall insulation and heat reflection structure in 5 can improve the combustion efficiency of the flue gas and reduce the loss of heat dissipation. Most of the heat is transferred to the cooking pot on the pot platform 6 through radiation and convective heat exchange. The high-temperature flue gas after heat release It is divided into two paths through the turning angle 7, one is discharged by the exhaust flue 8, and the other part is mixed with the fresh air in the circulating flue 9 and the secondary air path 11, and then passed through the mixing flue 12 and then used as the secondary air burned by the burner 3 , this secondary air has the characteristics of high temperature and low oxygen content, so that the diffusion combustion around the burner head 3 achieves the effect of high efficiency and low pollution.

Claims (3)

1. A household gas stove with flue gas recirculation, the gas nozzle is connected with the burner through an ejector; it is characterized in that the burner is located in the combustion chamber formed by the furnace wall; the opposite end of the ejector in the combustion chamber is provided with The flue exhaust duct and the secondary air duct are also provided with a steering angle in the combustion chamber. A recirculation flue is formed between the steering angle and the rear wall of the gas furnace. The recirculation flue is connected to the exhaust duct at the upper end of the combustion chamber and It communicates with the secondary air duct and the mixing air duct. 2. The household gas stove with flue gas recirculation according to claim 1, characterized in that: the combustion chamber is a box-shaped structure composed of furnace walls. 3. The household gas stove with flue gas recirculation according to claim 1 or 2, characterized in that: the furnace wall inside the combustion chamber is made of white high-temperature-resistant ceramic material.

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