CN203190411U - Combined gas burner - Google Patents

Abstract

A combined gas burner comprises a first gas system which is of a straight tube structure, wherein a first ventilation system which is of a straight tube structure is sleeved outside the first gas system, a second ventilation system which is in a Venturi tube type is arranged on the outer side of the first ventilation system, a second gas system which is in a volute spiral-flow type is arranged on the outer side of the second ventilation system, the first gas system and the second gas system are coaxial, and the first ventilation system and the second ventilation system are coaxial. According to the combined gas burner, automatic adjustment mixing burning of two gases which are different in pressure or heat value can be achieved, and staged burning of a same kind of gas can also be achieved; two sets of independent gas valve systems and two independent draught fans can be adopted to supply gas and air in proportion to two sets of burning systems respectively, and adjusting of air and gas ratio is accurate. The problems caused when two different gases are automatically mixed to burn and one gas automatically burns in a staged mode are solved. The combined gas burner has the advantages of being high in burning efficiency, low in pollutant emission, and wide in application range of gas.

Description

A composite gas burner

technical field

The utility model relates to a composite gas burner.

Background technique

In recent years, titanium dioxide kilns and molten salt furnaces have put forward requirements for burners to automatically adjust the oven or empty pipe preheating. The adjustment range of the oven gas volume is usually very small, and general gas burners cannot meet the requirements. In addition, with the need for energy saving and environmental protection, the market has put forward a demand for burners that can burn two types of gas with different calorific values or pressures at the same time. This new demand cannot be met by burners with other structures.

Utility model content

The purpose of the utility model is to provide a composite gas burner, which can realize the automatic adjustment mixed combustion of two gases with different pressures or calorific values, and can also realize the staged combustion of the same kind of gas. Two sets of independent gas valve systems and two independent fans can be used to supply air and air in proportion to the two sets of combustion systems, and the air and fuel ratio can be adjusted accurately. The problem of automatic mixed combustion of two different gases and automatic graded combustion of one kind of gas is solved. It has the characteristics of high combustion efficiency and low pollutant emission, and the gas has a wide range of applications.

The technical solution adopted to achieve the above purpose includes the first gas system, which is a straight-pipe structure, and the first ventilation system is installed outside the first gas system, which is a straight-pipe structure, and the outside of the first ventilation system is equipped with The second ventilation system, the second ventilation system is a Venturi tube type, the second gas system is provided outside the second ventilation system, which is a volute swirl type, the first gas system and the second gas system, The first ventilation system and the second ventilation system are coaxial.

Compared with the prior art, the utility model has the following advantages.

1. One kind of gas can be used for staged combustion, or two kinds of gas with large calorific value and pressure difference can be used for co-combustion, or two kinds of gas with equal or similar calorific value but large pressure difference can be used for co-combustion .

2. Each of the two air systems has independent air ducts, air distributors and servo air regulators, which can implement reasonable air-fuel ratio adjustments with the gas flow of the corresponding gas system, so that thermal equipment can produce higher thermal efficiency.

3. The adjustment ratio of the whole set of burners can reach 30:1~40:1, which is beneficial to the precise control of the temperature curve of the hot blast stove or empty pipe preheating.

4. The low nitrogen oxide combustion method can be used to greatly reduce the nitrogen oxide content in the combustion flue gas.

5. Combustible calorific value not less than 750kcal/Nm ³ liquefied petroleum gas, natural gas, coke oven gas, water gas and various combustible tail gas, waste gas, etc.

6. The output power of the burner ranges from 990kW to 80000kW.

7. The combustion efficiency of natural gas is not less than 99.5%, and the volume fraction of each component in the flue gas is O ₂ ≤3.5%, CO ≤0.010%; NO _X ≤200mg/m ³ .

Description of drawings

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

Figure 1 is a three-dimensional schematic diagram of the structure of the device.

Figure 2 is a schematic cross-sectional view of the structure of the device.

Fig. 3 is the mouth view of the burner of the device.

Detailed ways

The device includes a first gas system 13, which is a straight-pipe structure, and a first ventilation system 12 is set outside the first gas system 13, which is a straight-pipe structure, as shown in Figures 1, 2, and 3. The outside of a ventilation system 12 is provided with a second ventilation system 14, the second ventilation system 14 is a Venturi tube type, and the outside of the second ventilation system 14 is provided with a second gas system 15, which is a volute swirl type. The first gas system 13 and the second gas system 15, the first ventilation system 12 and the second ventilation system 14 are coaxial.

The front end of the first gas system 13 is provided with a blunt body flame stabilizer 10 and a swirl flame stabilizer 11, a gas injection hole is provided between the two flame stabilizers, and an interface flange is provided at the tail to connect with the gas valve system.

The inlet of the air duct of the first ventilation system 12 is provided with a tile-type cyclone, and a streamlined first air box 9 for equalizing pressure is arranged outside the tile-type cyclone, and a first bellows 9 is arranged on the straight pipe section of the inlet of the first air box 9. Ventilation system damper and its servo adjustment mechanism 1; a flange is provided at the inlet of the straight pipe, which can be connected with the fan.

The outlet of the second ventilation system 14 is provided with a swirl vane, a streamlined second wind box 8 is set at its entrance, and a second ventilation system damper and its servo adjustment mechanism 6 are arranged on the straight pipe section at the entrance of the second wind box 8. There is a flange at the inlet of the straight pipe, which can be connected with the fan.

The second gas system 15 includes a second gas system volute 7, a spiral deflector is provided inside the volute, a slit nozzle is provided at the exit of the volute, and a flange is provided at the entrance of the volute, which can be connected with the gas The valves are connected.

The first bellows 9 is provided with junction box 2, gas igniter 3, flame observation tube 4 and flame monitor 5, as shown in Figure 1; The air-fuel mixture outlet of the combustion system, 17 is the outlet of the second gas system, 18 is the outlet of the second ventilation system, 19 is the nozzle (side opening) of the first gas system, and 20 is the outlet of the air-fuel mixture of the first combustion system.

Embodiment

1 Burner features

The main structural features of this kind of burner are different from other burners. First, the burner is composed of two sets of combustion systems; second, each set of combustion systems has its own independent gas system and ventilation system; third, the first and second The second ventilation system and the second gas system contain air boxes or volutes with rectification and pressure equalization functions; fourth, the inlets of each air system and gas system are equipped with interface flanges, which can be connected to independent gas sources and air sources respectively .

It is mainly composed of two sets of gas systems and two sets of ventilation systems. The adjacent gas system and air system form an independent combustion system. Set fire to burn.

Each gas system and air system are cylindrical and coaxial.

The innermost layer is the first gas system, which is a straight pipe structure, with a blunt body flame stabilizer and a swirling flame stabilizer at the front end, and a gas injection hole between the two flame stabilizers; Gas valves are connected.

In addition to the first gas system, the first ventilation system is installed, which is also a straight pipe structure. A tile-type cyclone is installed at the inlet of the air duct, and a streamlined pressure equalizing air box is installed outside the tile-type cyclone, and an air door and its servo adjustment mechanism are installed on the straight pipe section at the inlet of the bellows; a flange is installed at the inlet of the straight pipe , can be connected with the fan. The first gas system and the first ventilation system form the first combustion system.

In addition to the first ventilation system, a second ventilation system is installed, which is Venturi tube type. Set swirl blades at the outlet of the Venturi tube, set a flow linear bellows at its entrance, set a damper and its servo adjustment mechanism on the straight pipe section at the entrance of the bellows; set a flange at the entrance of the straight pipe, which can be connected to the fan.

The second gas system is installed outside the Venturi tube, which is a volute swirl type. A spiral deflector is provided inside the volute, a slit nozzle is provided at the exit of the volute, and a flange is arranged at the entrance of the volute, which can be connected with the gas valve system.

2 working principle

When the two sets of combustion systems are activated, start the first combustion system first, and the gas is sprayed into the combustion-supporting air from the nozzle hole at an angle of 90° to form an air-fuel mixture in the form of impact and diffusion, and form a combustion flame after ignition; the second The first set of combustion system starts after the combustion load of the first set of combustion system reaches the rated value, and when the second set of combustion system reaches its combustion load, the whole set of burners reaches the rated load. If the burner reduces the combustion load, first reduce the load of the second combustion system, and then reduce the load of the first combustion system. Both systems are equipped with their own independent manual/automatic control system and manual/automatic load adjustment system.

When only one of the combustion systems is started, only one of the corresponding manual/automatic control systems and manual/automatic load adjustment systems can be used.

The selection of the above three combustion states can only be selected through the selection switch on the control box panel.

Claims (5)

1. combined type gas burner, comprise first gas burning system (13), be the straight pipe type structure, outside first gas burning system (13) suit first ventilating system (12), be the straight pipe type structure, it is characterized in that, described first ventilating system (12) outside is provided with second ventilating system (14), described second ventilating system (14) is venturi-type, described second ventilating system (14) outside is provided with second gas burning system (15), be the spiral case spiral-flow type, described first gas burning system (13) and second gas burning system (15), first ventilating system (12) and second ventilating system (14) have alignment.

2. a kind of combined type gas burner according to claim 1, it is characterized in that, described first gas burning system (13) front end is provided with bluff body flame holder (10) and spiral-flow type flame holder (11), be provided with gas jet orifice between two flame holders, its afterbody arranges flange, and system links to each other with gas valve.

3. a kind of combined type gas burner according to claim 1, it is characterized in that, described first ventilating system (12) airduct import is provided with the tile type cyclone, streamlined is set outside the tile type cyclone all presses first bellows (9), at first bellows (9) entrance straight length first air door of ventilation system and servo governor motion (1) thereof are set; At the straight tube entrance flange is set, can links to each other with blower fan.

4. a kind of combined type gas burner according to claim 1, it is characterized in that, described second ventilating system (14) exit is provided with swirl vane, cleanliness second bellows (8) are set in its porch, be provided with second air door of ventilation system and servo governor motion (6) thereof at second bellows (8) entrance straight length, manage orchid at the straight tube entrance, can link to each other with blower fan.

5. a kind of combined type gas burner according to claim 1, it is characterized in that, described second gas burning system (15) comprises the second gas burning system spiral case (7), spiral case inside is provided with spiral type flow guide plates, be provided with slot formula spout in the spiral case exit, be provided with flange in volute inlet, can link to each other with gas valve system.

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