Tail gas incinerator for formaldehyde production

Abstract

The utility model discloses a tail gas incinerator for formaldehyde production, which comprises an incinerator body, the incinerator body is divided into a lower hearth and an upper hearth, a collecting plate is arranged between the lower hearth and the upper hearth, a heat insulation layer is arranged at the bottom of the lower hearth, a gas inlet pipe is arranged on the lower portion of the heat insulation layer, the gas inlet pipe penetrates through the heat insulation layer and is connected with a tail gas channel, and the tail gas channel is communicated with a downward gas nozzle. An air pipeline is arranged on the outer side of the furnace body, an air nozzle penetrating through the lower hearth is arranged on the air pipeline, a burner, a temperature sensor and a water cooling wall are arranged in the upper hearth, and the top of the furnace body is communicated with a smoke exhaust pipeline. The upper hearth and the lower hearth are arranged and separated through the collecting plate, the mixing effect of formaldehyde tail gas and air can be improved, combustion is more sufficient, the tail gas channel and the downward air nozzle are arranged, the flow speed of the tail gas can be effectively reduced, combustion efficiency is improved, the annular air pipeline and the air nozzle are arranged, and the combustion efficiency is improved. The air and the tail gas are mixed more uniformly.

Description

Technical Field

[0001] The utility model belongs to the technical field of formaldehyde tail gas treatment equipment, and specifically relates to a tail gas incinerator for formaldehyde production. Background Art

[0002] During formaldehyde production, a certain amount of tail gas will be generated. The components of the tail gas include hydrogen, carbon monoxide, carbon dioxide, oxygen, nitrogen, and extremely small amounts of methane, methanol, formaldehyde, etc. Among them, nitrogen accounts for the vast majority, about 72 - 75% or so. Due to the presence of a small amount of formaldehyde gas, it has a strong pungent smell, and direct emission will cause environmental pollution. Currently, most enterprises adopt the method of direct combustion and discharge for tail gas treatment. During the combustion process, powder is supplemented, which is likely to cause environmental pollution. At the same time, formaldehyde tail gas has the characteristics of "small volume and large wind", and in addition, it needs to be mixed with air to increase the "oxidizer", resulting in a sparser combustible component, making the combustion insufficient, and the combustion temperature is low, prone to furnace chamber flameout, affecting the thermal efficiency, and at the same time causing the initial emission concentration of boiler gas to exceed the standard. Content of the Utility Model

[0003] In view of the above technical problems, the utility model provides a tail gas incinerator for formaldehyde production.

[0004] To solve the above technical problems, the technical solution adopted by the utility model is: a tail gas incinerator for formaldehyde production, including a furnace body, the furnace body is divided into a lower furnace chamber and an upper furnace chamber, a converging plate is arranged between the lower furnace chamber and the upper furnace chamber, a heat insulation layer is arranged at the bottom of the lower furnace chamber, an air inlet pipe is arranged below the heat insulation layer, a tail gas duct is connected through the heat insulation layer on the air inlet pipe, a downward air nozzle is communicated on the tail gas duct, an air duct is arranged outside the furnace body, an air nozzle penetrating through the lower furnace chamber is arranged on the air duct, a burner, a temperature sensor and a water-cooled wall are arranged in the upper furnace chamber, a smoke exhaust duct is communicated at the top of the furnace body, including a controller, and the burner is controlled by the controller.

[0005] Further, refractory bricks are arranged in the furnace body.

[0006] Further, it includes a tail gas inlet, the tail gas inlet is communicated with the air inlet pipe through a pipeline, a first air pump and a first one-way valve are arranged in sequence on this pipeline, and the first air pump is controlled by the controller.

[0007] Further, it includes an air filter, the air filter is communicated with the air duct through a pipeline, a second air pump and a second one-way valve are arranged in sequence on this pipeline, and the second air pump is controlled by the controller.

[0008] Further, it includes a fuel tank, the fuel tank is communicated with the burner through a pipeline, a third air pump and a third one-way valve are arranged in sequence on this pipeline, and the third air pump is controlled by the controller.

[0009] Furthermore, the water-cooled wall penetrates through the upper furnace and is connected with a water inlet and a water outlet.

[0010] The utility model has the following advantages compared with the prior art:

[0011] The utility model is provided with an upper furnace and a lower furnace, and is separated by a converging plate, which can improve the mixing effect of formaldehyde tail gas and air, so that the combustion is more complete. A tail gas duct and a downward gas nozzle are provided, which can effectively slow down the flow rate of the tail gas, thereby improving the combustion efficiency. An annular air duct and air nozzles are provided, so that the air and the tail gas are mixed more evenly. A water-cooled wall is provided, which can recover heat and reduce waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a schematic structural diagram of the utility model.

[0013] Figure 2 is a schematic structural diagram of the tail gas duct of the utility model.

[0014] Figure 3 is a schematic structural diagram of the air duct of the utility model.

[0015] Wherein: 1. Furnace body, 1a. Lower furnace, 1b. Upper furnace, 2. Air duct, 3. Air nozzle, 4. Converging plate, 5. Temperature sensor, 6. Water-cooled wall, 6a. Water inlet, 6b. Water outlet, 7. Smoke exhaust duct, 8. Burner, 9. Third one-way valve, 10. Third air pump, 11. Fuel tank, 12. Second one-way valve, 13. Second air pump, 14. Air filter, 15. Tail gas inlet, 16. First air pump, 17. First one-way valve, 18. Tail gas duct, 19. Gas nozzle, 20. Intake pipe, 21. Heat insulation layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The following will further describe the utility model with reference to the drawings.

[0017] As Figures 1 - 3 shown, a tail gas incinerator for formaldehyde production includes a furnace body 1. The furnace body 1 is divided into a lower furnace 1a and an upper furnace 1b. A converging plate 4 is arranged between the lower furnace 1a and the upper furnace 1b. A heat insulation layer 21 is arranged at the bottom of the lower furnace 1a. An intake pipe 20 is arranged below the heat insulation layer 21. The intake pipe 20 penetrates through the heat insulation layer 21 and is connected with a tail gas duct 18. A downward gas nozzle 19 is connected to the tail gas duct 18. An air duct 2 is arranged outside the furnace body 1. An air nozzle 3 penetrating through the lower furnace 1a is arranged on the air duct 2. A burner 8, a temperature sensor 5 and a water-cooled wall 6 are arranged in the upper furnace 1b. A smoke exhaust duct 7 is connected to the top of the furnace body 1, including a controller. The burner 8 is controlled by the controller.

[0018] Among them, the temperature sensor 5 uses a thermocouple.

[0019] In this embodiment, the number of exhaust gas channels 18 is 3, and 4 exhaust nozzles 19 are provided on each exhaust gas channel 18.

[0020] In order to prevent the furnace body 1 from being burned out, refractory bricks are provided in the furnace body 1.

[0021] In order to prevent the exhaust gas passage from backfiring, including an exhaust gas inlet 15, the exhaust gas inlet 15 is connected to the intake pipe 20 through a pipeline. A first air pump 16 and a first one-way valve 17 are sequentially provided on this pipeline, and the first air pump 16 is controlled by the controller.

[0022] In order to prevent the air passage from backfiring, including an air filter 14, the air filter 14 is connected to the air pipeline 2 through a pipeline. A second air pump 13 and a second one-way valve 12 are sequentially provided on this pipeline, and the second air pump 13 is controlled by the controller.

[0023] In order to prevent the burner 8 from backfiring, including a fuel tank 11, the fuel tank 11 is connected to the burner 8 through a pipeline. A third air pump 10 and a third one-way valve 9 are sequentially provided on this pipeline, and the third air pump 10 is controlled by the controller.

[0024] In order to facilitate heat recovery, the water-cooled wall 6 penetrates the upper furnace chamber 1b and is connected with a water inlet 6a and a water outlet 6b.

[0025] The specific working process of the present utility model is as follows:

[0026] When producing formaldehyde, the exhaust gas enters the exhaust gas inlet 15, enters the intake pipe 20 through the pipeline by the first air pump 16, and then passes through the nozzles 19 on the exhaust gas channel 18 and reaches the lower furnace chamber 1a. The air first passes through the air filter 14 to filter out dust, and then enters the air pipeline 2 through the acceleration of the second air pump 13. It reaches the lower furnace chamber 1a through the air nozzle 3 and is mixed with the exhaust gas, and then enters the upper furnace chamber 1b through the converging plate 4, and is ignited and burned by the burner 8, and finally is discharged to the subsequent process through the exhaust pipe 7.

[0027] The water-cooled wall 6 plays a role in absorbing heat to recover heat. The water in the water-cooled wall 6 enters from the water inlet 6a and is discharged from the water outlet 6b.

[0028] The temperature sensor 5 collects the temperature in the upper furnace chamber 1b, and when the temperature is too low, the burner 8 is turned on for ignition.

[0029] The fuel tank 11 supplies fuel to the burner 8.

[0030] The first one-way valve 17, the second one-way valve 12, and the third one-way valve 9 play a role in preventing backfiring. The refractory bricks in the furnace body 1 prevent the furnace body 1 from being burned out, and the heat insulation layer 21 prevents the intake pipe 20 from being burned out.

Claims

1. A tail gas incinerator for formaldehyde production, comprising a furnace body (1), wherein the furnace body (1) is divided into a lower furnace (1a) and an upper furnace (1b), characterized in that: A convergence plate (4) is arranged between the lower furnace (1a) and the upper furnace (1b); a heat insulation layer (21) is arranged at the bottom of the lower furnace (1a); an air intake pipe (20) is arranged at the lower part of the heat insulation layer (21); the air intake pipe (20) passes through the heat insulation layer (21) and is connected to an exhaust duct (18); the exhaust duct (18) is connected to a downward air nozzle (19); an air duct (2) is arranged on the outside of the furnace body (1); an air nozzle (3) passing through the lower furnace (1a) is arranged on the air duct (2); a burner (8), a temperature sensor (5) and a water-cooled wall (6) are arranged in the upper furnace (1b); a smoke exhaust pipe (7) is connected to the top of the furnace body (1), and the burner (8) is controlled by a controller.

2. The tail gas incinerator for formaldehyde production according to claim 1, characterized in that: Refractory bricks are arranged in the furnace body (1).

3. The tail gas incinerator for formaldehyde production according to claim 1, characterized in that: The invention comprises an exhaust gas inlet (15), wherein the exhaust gas inlet (15) is connected to the intake pipe (20) through a pipeline, and a first air pump (16) and a first one-way valve (17) are arranged on the pipeline in sequence, and the first air pump (16) is controlled by the controller.

4. The tail gas incinerator for formaldehyde production according to claim 1, characterized in that: It comprises an air filter (14), wherein the air filter (14) is connected to the air pipeline (2) through a pipeline, and a second air pump (13) and a second one-way valve (12) are arranged on the pipeline in sequence, and the second air pump (13) is controlled by the controller.

5. The tail gas incinerator for formaldehyde production according to claim 1, characterized in that: It comprises a fuel tank (11), wherein the fuel tank (11) is connected to the burner (8) through a pipeline, and a third air pump (10) and a third one-way valve (9) are arranged on the pipeline in sequence, and the third air pump (10) is controlled by the controller.

6. The tail gas incinerator for formaldehyde production according to claim 1, characterized in that: The water-cooled wall (6) passes through the upper furnace (1b) and is connected to a water inlet (6a) and a water outlet (6b).

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