Oxygen-enriched adding device for boiler

Abstract

The utility model discloses a boiler oxygen enrichment adding device which comprises a mixing box, a mixing bin is arranged on the inner side of the mixing box, an inlet cavity is formed in the inner side of the mixing bin and connected with a mixing cavity, and a first connector and a second connector are arranged at one end of the inlet cavity. The first connector is sequentially connected with a first quick switching valve, a first manual valve and a first flow meter through pipelines, the second connector is connected with a connector at the left end of a three-way valve through a pipeline, and a connector at the upper end of the three-way valve is sequentially connected with a second quick switching valve, a second manual valve and a second flow valve through pipelines. According to the oxygen-enriched coal gas mixing device, the functions of increasing oxygen enrichment, enabling coal gas to be fully combusted and enabling oxygen and the coal gas to be evenly mixed are achieved.

Description

Technical Field

[0001] The utility model application relates to the technical field of boilers, and specifically relates to an oxygen-enriched addition device for boilers. Background Technique

[0002] The blast furnace gas contains many components such as nitrogen, carbon monoxide, and carbon dioxide. The flow rates of these components fluctuate greatly, resulting in large changes in the boiler combustion process. Sometimes, some gases cannot be fully burned during the combustion process, resulting in large combustion losses, low thermal efficiency, and easy over-standard emissions of various pollutants such as nitrogen oxides, sulfur dioxide, and dust, causing environmental pollution. The increase in the boiler flue gas content will also increase the fan output and power consumption. To solve the above problems, oxygen should be added to the boiler burner. Currently, the commonly used oxygen-enriched addition method in the prior art is to directly connect the pipeline to the boiler burner and add oxygen to the inside. However, the oxygen and gas are not mixed before combustion, and the combustion-supporting effect is low.

[0003] Therefore, designing a device that can increase oxygen enrichment, enable the gas to burn fully, and mix oxygen and gas evenly is exactly the problem to be solved by the inventor. Content of the Utility Model

[0004] Aiming at the deficiencies of the prior art, the purpose of the present utility model is to provide an oxygen-enriched addition device for boilers, which can achieve the functions of increasing oxygen enrichment, enabling the gas to burn fully, and mixing oxygen and gas evenly.

[0005] The technical solution adopted by the device of the present utility model is: an oxygen-enriched addition device for boilers, which includes a mixing tank. A mixing chamber is arranged inside the mixing tank. An inlet cavity is arranged inside the mixing chamber. The inlet cavity is connected to a mixing cavity. One end of the inlet cavity is provided with a first joint and a second joint. The first joint is sequentially connected with a first quick cut valve, a first manual valve, and a first flowmeter through a pipeline. The second joint is connected to the left-end interface of a three-way valve through a pipeline. The upper-end interface of the three-way valve is sequentially connected with a second quick cut valve, a second manual valve, and a second flow valve through a pipeline. The lower-end interface of the three-way valve is connected to a second regulating valve through a second connecting pipe. The outlet end of the mixing cavity is connected to a first regulating valve through a first connecting pipe. The end of the first connecting pipe is connected to three first branch pipes through a first four-way valve. The end of the second connecting pipe is connected to three second branch pipes through a second four-way valve. The first branch pipe is connected to the boiler burner through a first locking valve. The second branch pipe is connected to the boiler burner through a second locking valve.

[0006] Further, the first regulating valve, the second regulating valve, the first quick cut valve, the second quick cut valve, the first manual valve, the second manual valve, the first flowmeter, and the second flowmeter are all arranged inside the mixing tank.

[0007] Further, it further includes a box cover which is arranged on the front end face of the mixing box, and two observation windows opposite to the positions of the first flowmeter and the second flowmeter are opened on the upper part of the box cover.

[0008] Further, through holes opposite to the positions of the first manual valve and the second manual valve are opened on the box cover, and the valve stems of the first manual valve and the second manual valve respectively pass through the inner sides of the through holes.

[0009] Further, an electric control box is arranged on the side of the mixing box, and a controller, a display and a power supply module are arranged inside the electric control box. The controller is electrically connected to the power supply module and the display respectively, and the controller is electrically connected to the first regulating valve, the second regulating valve, the first quick cut-off valve, the second quick cut-off valve, the first flowmeter and the second flowmeter respectively through wires.

[0010] Further, the controller is electrically connected to the first locking valve and the second locking valve respectively through wires.

[0011] Further, the mixing cavity is of a serpentine pipe structure.

[0012] The beneficial effects of the device of the present utility model are as follows:

[0013] 1. The present utility model adopts a mixing box in cooperation with a variety of valves for switching use, uniformly mixes oxygen and gas in the mixing cavity, can switch the use state to determine whether to mix oxygen, realizes the function of increasing oxygen enrichment, enabling the gas to burn fully and the oxygen and gas to be mixed evenly. Description of the Drawings

[0014] Figure 1 is a schematic structural diagram of the present utility model.

[0015] Figure 2 is a schematic structural diagram of the mixing box of the present utility model.

[0016] Description of the reference numerals: 1 - first locking valve; 2 - second locking valve; 3 - first branch pipe; 4 - first four-way valve; 5 - second branch pipe; 6 - second four-way valve; 7 - mixing box; 8 - first connecting pipe; 9 - second connecting pipe; 10 - first regulating valve; 11 - second regulating valve; 12 - electric control box; 13 - three-way valve; 14 - second quick cut-off valve; 15 - second manual valve; 16 - second flowmeter; 17 - first flowmeter; 18 - first manual valve; 19 - first quick cut-off valve; 20 - mixing bin; 21 - inlet cavity; 22 - mixing cavity. Detailed Embodiments

[0017] The following will further elaborate on the device of the present utility model in conjunction with specific embodiments. These embodiments are only used to illustrate the present utility model and not to limit the scope of the present utility model. In addition, it should be understood that after reading the content taught by the device of the present utility model, those skilled in the art can make various changes or modifications to the present utility model, and these equivalent forms also fall within the scope defined by the appended claims of the application.

[0018] See Figures 1 to 2 is a schematic structural diagram of the present utility model and a schematic structural diagram of the mixing tank 7. A boiler oxygen-enriched addition device includes a mixing tank 7. Inside the mixing tank 7, there is a mixing chamber 20. Inside the mixing chamber 20, there is an inlet cavity 21. The inlet cavity 21 is connected to a mixing cavity 22. At one end of the inlet cavity 21, there are a first joint and a second joint. The first joint is sequentially connected to a first quick cut valve 19, a first manual valve 18, and a first flowmeter 17 through a pipeline. The second joint is connected to the interface at the left end of a three-way valve 13 through a pipeline. The interface at the upper end of the three-way valve 13 is sequentially connected to a second quick cut valve 14, a second manual valve 15, and a second flow valve through a pipeline. The end of the pipeline connected to the first joint is connected to the source of oxygen. Generally, the oxygen produced by the oxygen production workshop is transported to the boiler burner through a pipeline. The pipeline connected to the interface at the upper end of the three-way valve 13 is connected to the source of gas. The flowmeter is used to monitor the gas flow in real time, the manual valve is used to manually control the on-off of the pipeline, and the quick cut valve is used to quickly cut off the pipeline.

[0019] The interface at the lower end of the three-way valve 13 is connected to a second regulating valve 11 through a second connecting pipe 9. The outlet end of the mixing chamber 22 is connected to a first regulating valve 10 through a first connecting pipe 8. The end of the first connecting pipe 8 is connected to three first branch pipes 3 through a first four-way valve 4. The end of the second connecting pipe 9 is connected to three second branch pipes 5 through a second four-way valve 6. The first branch pipe 3 is connected to the boiler burner through a first locking valve 1. The second branch pipe 5 is connected to the boiler burner through a second locking valve 2. The structural arrangement of the overall pipeline forms two path selection options. By closing one or more of the first manual valve 18, the first quick cut valve 19, and the first locking valve 1, the path where the first manual valve 18 is located can be closed. At this time, the interface at the left end of the three-way valve 13 is closed. In this way, the pipeline connected to the mixing tank 7 is in an idle state, and the upper and lower ports of the three-way valve 13 are connected. The gas can sequentially enter the second connecting pipe 9 through the second flowmeter 16, the second manual valve 15, and the second quick cut valve 14, and then enter three different boiler burners for combustion through the three second branch pipes 5 connected to the second connecting pipe 9 and the second locking valve 2;

[0020] By opening the first manual valve 18, the first quick cut-off valve 19, and the first locking valve 1, and opening the interfaces at the left end and upper end of the three-way valve 13 while closing the interface at the lower end of the three-way valve 13, the pipeline connected to the mixing tank 7 can be put into an open state. Oxygen sequentially passes through the first flowmeter 17, the first manual valve 18, and the first quick cut-off valve 19 and enters the inlet cavity 21. Coal gas sequentially passes through the second flowmeter 16, the second manual valve 15, and the second quick cut-off valve 14 and enters the inlet cavity 21. The two gases make initial contact and mixing in the inlet cavity 21, and the mixed gas then enters the mixing chamber 22. The mixing chamber 22 is a serpentine pipeline structure. In the serpentine mixing chamber 22, the two gases are further mixed to make the mixing more uniform. The uniformly mixed gas enters the first connecting pipe 8, and then enters three different boiler burners through the three first branch pipes 3 connected to the first connecting pipe 8 and the first locking valve 1 for combustion.

[0021] The first regulating valve 10, the second regulating valve 11, the first quick cut-off valve 19, the second quick cut-off valve 14, the first manual valve 18, the second manual valve 15, the first flowmeter 17, and the second flowmeter 16 are all arranged inside the mixing tank 7. It also includes a box cover. The box cover is arranged on the front end face of the mixing tank 7. Two observation windows opposite to the positions of the first flowmeter 17 and the second flowmeter 16 are opened on the upper part of the box cover, which is convenient for directly observing the readings of the flowmeters from the outside.

[0022] Through holes opposite to the positions of the first manual valve 18 and the second manual valve 15 are opened on the box cover, and the valve stems of the first manual valve 18 and the second manual valve 15 are respectively passed through the inner sides of the through holes, which facilitates directly manually operating the first manual valve 18 and the second manual valve 15 from the outside of the box body.

[0023] An electric control box 12 is arranged on the side of the mixing tank 7. A controller, a display, and a power supply module are arranged inside the electric control box 12. The controller is electrically connected to the power supply module and the display respectively. The controller is electrically connected to the first regulating valve 10, the second regulating valve 11, the first quick cut-off valve 19, the second quick cut-off valve 14, the first flowmeter 17, and the second flowmeter 16 respectively through wires. The controller is electrically connected to the first locking valve 1 and the second locking valve 2 respectively through wires.

[0024] The oxygen produced in the oxygen production workshop is transported to the boiler burner through a pipeline, fully mixed with coal gas, and then enters the furnace for combustion together. The operator controls the amount of oxygen enrichment through the regulating valve to ensure that the oxygen content is less than 30%, ensuring that the blast furnace gas can burn fully. When the boiler malfunctions, the oxygen is quickly cut off through the quick cut-off valve to ensure the safe operation of the boiler.

[0025] By reducing the content of air, the emissions of flue gas during combustion can be reduced. Increasing oxygen enrichment helps to lower the fuel ignition temperature, shorten the burnout time, increase the combustion temperature, and enhance the flue gas radiation ability.

[0026] This utility model uses a mixing box 7 in combination with multiple valve switches to evenly mix oxygen and gas in a mixing cavity 22. The usage state can be switched to determine whether to mix oxygen, achieving the functions of increasing oxygen enrichment, enabling the gas to burn fully, and ensuring uniform mixing of oxygen and gas.

Claims

1. A boiler oxygen enrichment adding device, characterized in that: The invention comprises a mixing box (7), wherein a mixing chamber (20) is arranged on the inner side of the mixing box (7), wherein an inlet chamber (21) is arranged on the inner side of the mixing chamber (20), wherein the inlet chamber (21) is connected to a mixing chamber (22), wherein one end of the inlet chamber (21) is provided with a first joint and a second joint, wherein the first joint is connected to a first quick-cut valve (19), a first manual valve (18), and a first flow meter (17) in sequence through a pipeline, wherein the second joint is connected to an interface at the left end of a three-way valve (13) through a pipeline, and wherein an interface at the upper end of the three-way valve (13) is connected to a second quick-cut valve (14), a second manual valve (15), and a second flow meter (17) in sequence through a pipeline. A second flow valve, wherein the interface at the lower end of the three-way valve (13) is connected to a second regulating valve (11) via a second connecting pipe (9), the outlet end of the mixing chamber (22) is connected to a first regulating valve (10) via a first connecting pipe (8), the end of the first connecting pipe (8) is connected to three first branch pipes (3) via a first four-way valve (4), the end of the second connecting pipe (9) is connected to three second branch pipes (5) via a second four-way valve (6), the first branch pipe (3) is connected to a boiler burner via a first locking valve (1), and the second branch pipe (5) is connected to the boiler burner via a second locking valve (2).

2. A boiler oxygen enrichment adding device according to claim 1, characterized in that: The first regulating valve (10), the second regulating valve (11), the first quick-cut valve (19), the second quick-cut valve (14), the first manual valve (18), the second manual valve (15), the first flow meter (17), and the second flow meter (16) are all arranged inside the mixing box (7).

3. A boiler oxygen enrichment adding device according to claim 2, characterized in that: It also includes a box cover, which is arranged on the front end surface of the mixing box (7), and has two observation windows on the upper part thereof, which are opposite to the first flow meter (17) and the second flow meter (16).

4. A boiler oxygen enrichment adding device according to claim 3, characterized in that: The box cover is provided with a through hole which is opposite to the first manual valve (18) and the second manual valve (15), and the valve stems of the first manual valve (18) and the second manual valve (15) are passed through the inner side of the through hole.

5. A boiler oxygen enrichment adding device according to claim 1, characterized in that: An electric control box (12) is arranged on the side of the mixing box (7), and a controller, a display, and a power module are arranged inside the electric control box (12). The controller is electrically connected to the power module and the display respectively, and the controller is electrically connected to the first regulating valve (10), the second regulating valve (11), the first quick-cut valve (19), the second quick-cut valve (14), the first flow meter (17), and the second flow meter (16) respectively through wires.

6. A boiler oxygen enrichment adding device according to claim 5, characterized in that: The controller is electrically connected to the first locking valve (1) and the second locking valve (2) via wires.

7. A boiler oxygen enrichment adding device according to claim 1, characterized in that: The mixing chamber (22) is a serpentine pipe structure.

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