Rocking furnace combustion system based on oxygen-fuel combustion technology

Abstract

The utility model discloses a rocking furnace combustion system based on oxygen-fuel combustion technology, which comprises a valve group, a plurality of groups of combustion pipeline mechanisms and a rocking furnace, a natural gas station and an industrial oxygen machine are respectively connected with the valve group through pipelines, an outlet pipeline of the valve group is connected with the plurality of groups of combustion pipeline mechanisms, and outlets of the combustion pipeline mechanisms are connected with the rocking furnace. The combustion pipeline mechanism comprises a combustion oxygen pipeline, a combustion flame length oxygen pipeline, a natural gas pipeline, a spray gun and a nozzle, the valve group is connected with one end of the combustion oxygen pipeline, one end of the combustion flame length oxygen pipeline and one end of the natural gas pipeline, and the combustion oxygen pipeline and the combustion flame length oxygen pipeline are connected with the spray gun after being converged into a pipeline; the natural gas pipeline is connected with the spray gun which is connected with the nozzle which is arranged in the rocking furnace. The oxygen-fuel combustion technology is adopted, the flame temperature is high, the water vapor concentration is high, the batch melting speed is increased, and the melting rate is increased by more than 10%.

Description

Technical Field

[0001] The utility model belongs to the technical field of pyrometallurgical refining in the smelting industry, and specifically relates to a shaking furnace combustion system based on the full oxygen combustion technology. Background Art

[0002] In traditional air combustion, oxygen only accounts for about 21%, and nitrogen that does not participate in the combustion reaction accounts for 78%. It is discharged into the atmosphere after being heated, causing a large amount of flue gas heat loss (accounting for about 30% of the kiln energy consumption). At high temperatures, nitrogen will also react with oxygen to generate a large amount of nitrogen oxides NOX, causing serious environmental pollution. In order to improve the utilization rate of fuel combustion heat and reduce the generation and emission of polluting gases, it can be achieved by increasing the proportion of oxygen in the combustion-supporting gas and reducing the proportion of nitrogen. When the concentration of combustion-supporting oxygen reaches more than 90%, it is called full oxygen combustion. Taking natural gas as fuel as an example, the combustion products are only H2O and CO2.

[0003] Pure oxygen combustion technology involves almost no N2, and the combustion products are all triatomic gases. The flue gas has high blackness, high flame temperature, large radiation coefficient, high combustion efficiency, and obvious energy-saving effect. The CO2 concentration in the flue gas components is greatly increased (more than 80%), which is conducive to the capture of CO2.

[0004] At present, oxy-fuel combustion technology has not been widely popularized in industrial combustion applications, mainly because the technology requires low-cost industrial oxygen as support. It is mostly used in glass product production, copper smelting shaking furnaces, reverberatory furnaces and other processes. Oxy-fuel combustion is most commonly used in glass tank furnaces. Research began in the 1940s. In 1983, Corning Incorporated in the United States built the first natural gas oxy-fuel combustion glass melting furnace, and subsequently transformed its 34 glass melting furnaces with oxy-fuel combustion systems, with significant energy-saving effects. With the increasing attention paid to energy conservation, emission reduction, environmental protection and other issues, as well as the development of oxy-fuel combustion technology, more than 400 oxy-fuel combustion kilns have been built around the world, mainly concentrated in glass tank furnaces, crude copper refining shaking furnaces, smelting reverberatory furnaces, etc. Utility Model Content

[0005] In view of the above problems, the purpose of the utility model is to provide a shaking furnace combustion system based on full oxygen combustion technology.

[0006] The specific technical solutions are as follows:

[0007] A shaking furnace combustion system based on full oxygen combustion technology includes a valve group, multiple groups of combustion pipeline mechanisms and a shaking furnace. The natural gas station and the industrial oxygen machine are respectively connected to the valve group through pipelines. The valve group outlet pipeline is connected to the multiple groups of combustion pipeline mechanisms. The outlet of the combustion pipeline mechanism is connected to the shaking furnace. The combustion pipeline mechanism includes an oxygen pipeline for combustion, an oxygen pipeline for the combustion flame length, a natural gas pipeline, a spray gun and a nozzle. The valve group is connected to the oxygen pipeline for combustion, the oxygen pipeline for the combustion flame length and one end of the natural gas pipeline. The oxygen pipeline for combustion and the oxygen pipeline for the combustion flame length are merged into one pipeline and then connected to the spray gun. The natural gas pipeline is connected to the spray gun, and the spray gun is connected to the nozzle. The nozzle is arranged in the shaking furnace.

[0008] Furthermore, the spray gun is divided into an inner layer and an outer layer, and a first connecting port and a second connecting port are provided on the spray gun. The first connecting port is connected to the inner layer and the natural gas pipeline at the same time, and the second connecting port is connected to the outer layer and the pipeline after the combustion oxygen pipeline and the combustion flame length oxygen pipeline are merged and connected.

[0009] Furthermore, the end of the spray gun is piston-connected to the nozzle.

[0010] Furthermore, the wall thickness of the inner layer of the spray gun is 4-6 mm.

[0011] Furthermore, the nozzle is arranged on the shaking furnace at an angle.

[0012] Furthermore, control valves are provided on the combustion oxygen pipeline, the combustion flame length oxygen pipeline, and the natural gas pipeline.

[0013] Furthermore, an observation hole is provided on the spray gun, the observation hole is communicated with the inner layer, the inner circle of the observation hole is provided with a thread, and the observation hole is sealed by a bolt.

[0014] The beneficial effects of the utility model are:

[0015] The utility model adopts full oxygen combustion technology, cancels the use of coal gas, and also cancels the combustion-supporting fan, and only uses natural gas for combustion. It not only has strong controllability of furnace conditions, simple operation, quick parameter adjustment, and significant energy-saving effect. It effectively solves the shortcomings of high labor intensity, low labor productivity, and high energy consumption of workers in the field of pyro-refining technology in the smelting industry. At the same time, this application makes the flame temperature high and the water vapor concentration high in the production process, which accelerates the melting speed of the batch material and increases the melting rate by more than 10%. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the utility model;

[0017] Figure 2 It is a schematic diagram of the structure of the spray gun.

[0018] In the figure: 1. valve group; 2. combustion pipeline mechanism; 21. oxygen pipeline for combustion; 22. oxygen pipeline for combustion flame length; 23. natural gas pipeline; 24. spray gun; 241. inner layer; 242. outer layer; 243. first connecting port; 244. second connecting port; 245. observation hole; 246. bolt; 25. nozzle; 3. shaking furnace. DETAILED DESCRIPTION

[0019] The utility model is further described below in conjunction with the drawings in the specification, but the protection scope of the utility model is not limited thereto.

[0020] like Figure 1 As shown, a shaking furnace combustion system based on full oxygen combustion technology includes a valve group 1, multiple groups of combustion pipeline mechanisms 2 and a shaking furnace 3. The natural gas station and the industrial oxygen machine are respectively connected to the valve group 1 through pipelines, which are converted into more pipelines through the valve group 1. The outlet pipeline of the valve group 1 is connected to the multiple groups of combustion pipeline mechanisms 2. The outlets of the multiple groups of combustion pipeline mechanisms 2 are all connected to the shaking furnace 3. Each group of combustion pipeline mechanisms 2 includes a combustion oxygen pipeline 21, a combustion flame length oxygen pipeline 22, a natural gas pipeline 23, and a spray gun 24. The outlet pipeline of the valve group 1 is connected to the oxygen pipeline 21 for combustion, the oxygen pipeline 22 for the combustion flame length and one end of the natural gas pipeline 23. The oxygen pipeline 21 for combustion and the oxygen pipeline 22 for the combustion flame length are merged into one pipeline and then connected to the spray gun 24. The natural gas pipeline 23 is connected to the spray gun 24. The spray gun 24 is connected to the nozzle 25. The nozzle 25 extends into the shaking furnace 3. The oxygen pipeline 21 for combustion, the oxygen pipeline 22 for the combustion flame length and the natural gas pipeline 23 are provided with control valves.

[0021] like Figure 2 As shown, the spray gun 24 is divided into an inner layer 241 and an outer layer 242. The spray gun 24 is provided with a first connecting port 243 and a second connecting port 244. The first connecting port 243 is connected to the inner layer 241 and the natural gas pipeline 23. The second connecting port 244 is connected to the outer layer 242 and the pipeline after the combustion oxygen pipeline 21 and the combustion flame length oxygen pipeline 22 are connected. The wall thickness of the inner layer 241 of the spray gun 24 is 4-6 mm. The outlet end of the spray gun 24 is connected to the nozzle 25 in a piston-like manner. The other end is provided with an observation hole 245. The observation hole 245 is connected to the inner layer 241. The inner ring of the observation hole 245 is provided with a thread. The observation hole 245 is sealed by a bolt 246. The nozzle 25 is tilted on the shaking furnace 3, and the tilt angle is 30-45°.

[0022] During operation, the oxygen pressure at the outlet pipe of valve group 1 is 2.5~4.0 bar, the temperature is 10-20 °C, and the designed maximum oxygen flow rate is: 2100 Nm 3 / h, the natural gas pressure at the outlet pipeline of valve group 1 is 2.5~4.0 bar, the temperature is 10-20 °C, and the designed maximum natural gas flow rate is 1800 Nm 3 / h.

Claims

1. A shaking furnace combustion system based on full oxygen combustion technology, characterized in that: The invention comprises a valve group (1), a plurality of combustion pipeline mechanisms (2) and a shaking furnace (3). The natural gas station and the industrial oxygen machine are respectively connected to the valve group (1) through pipelines. The outlet pipeline of the valve group (1) is connected to the plurality of combustion pipeline mechanisms (2). The outlet of the combustion pipeline mechanism (2) is connected to the shaking furnace (3). The combustion pipeline mechanism (2) comprises a combustion oxygen pipeline (21), a combustion flame length oxygen pipeline (22), a natural gas pipeline (23), a spray gun (24) and a nozzle (25). The valve group (1) is connected to one end of the combustion oxygen pipeline (21), the combustion flame length oxygen pipeline (22) and the natural gas pipeline (23). The combustion oxygen pipeline (21) and the combustion flame length oxygen pipeline (22) are combined into one pipeline and then connected to the spray gun (24). The natural gas pipeline (23) is connected to the spray gun (24). The spray gun (24) is connected to the nozzle (25). The nozzle (25) is arranged in the shaking furnace (3).

2. A shaking furnace combustion system based on full oxygen combustion technology as claimed in claim 1, characterized in that: The spray gun (24) is divided into an inner layer (241) and an outer layer (242). The spray gun (24) is provided with a first connecting port (243) and a second connecting port (244). The first connecting port (243) is connected to the inner layer (241) and is also connected to the natural gas pipeline (23). The second connecting port (244) is connected to the outer layer (242) and is also connected to the pipeline after the combustion oxygen pipeline (21) and the combustion flame length oxygen pipeline (22) are merged and connected.

3. A shaking furnace combustion system based on full oxygen combustion technology as claimed in claim 2, characterized in that: The end of the spray gun (24) is connected to the nozzle (25) in a piston-like manner.

4. The shaking furnace combustion system based on full oxygen combustion technology according to claim 1, characterized in that: The wall thickness of the inner layer (241) of the spray gun (24) is 4 mm to 6 mm.

5. The shaking furnace combustion system based on full oxygen combustion technology as claimed in claim 1, characterized in that: The nozzle (25) is arranged obliquely on the shaking furnace (3).

6. The shaking furnace combustion system based on full oxygen combustion technology according to claim 1, characterized in that: Control valves are provided on the combustion oxygen pipeline (21), the combustion flame length oxygen pipeline (22), and the natural gas pipeline (23).

7. A shaking furnace combustion system based on full oxygen combustion technology as claimed in claim 2, characterized in that: The spray gun (24) is also provided with an observation hole (245), which is communicated with the inner layer (241), and the inner ring of the observation hole (245) is provided with a thread, and the observation hole (245) is sealed by a bolt (246).

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