Formaldehyde-containing waste gas treatment device

Abstract

The utility model discloses a formaldehyde-containing waste gas treatment device which is characterized in that when formaldehyde-containing production waste gas is conveyed into a pretreatment mechanism from a gas inlet pipe, the formaldehyde waste gas is pressed into a waste gas elution chamber of a water treatment mechanism through an exhaust pipe under the driving of an induced draft fan, and the formaldehyde is dissolved after entering the waste gas elution chamber; therefore, the total amount of formaldehyde entering a combustion link is reduced, and the pressure and difficulty of combustion treatment are reduced. The formaldehyde in the waste gas is firstly subjected to water treatment and then is subjected to the technical improvement of combustion, so that the limitation of combustion conditions and the fluctuation influence of the concentration and components of the formaldehyde waste gas are overcome, the formaldehyde gas can be sufficiently combusted and converted, and the emission of the formaldehyde which is not completely treated is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of waste gas treatment, and particularly relates to a waste gas treatment device for formaldehyde-containing waste gas. Background Art

[0002] Formaldehyde is a colorless and pungent organic compound, which is soluble in water and ethanol. It has an irritating effect on human eyes, nose, etc. At the same time, formaldehyde is a protoplasmic poison that destroys the protein of biological cells. It can combine with proteins, damage human skin, respiratory tract and internal organs, anesthetize the central nervous system of humans, and can cause pulmonary edema, hepatic coma, renal failure, etc. Therefore, in the production process, it is necessary to treat formaldehyde tail gas to prevent harm to humans.

[0003] In the current technical field of formaldehyde waste gas treatment, the more common treatment method is to directly burn formaldehyde waste gas through a combustion furnace. However, this direct combustion treatment method is difficult to ensure the full combustion of formaldehyde gas. Due to the limitations of combustion conditions and the fluctuations in the concentration and composition of formaldehyde waste gas, some formaldehyde gas may not be completely converted, resulting in the incomplete treatment of formaldehyde still being discharged into the environment, continuously causing harm to the environment and human health, and seriously affecting the treatment effect.

[0004] Therefore, in order to solve the above problems, there is an urgent need for a device that can fully burn formaldehyde waste gas and perform cyclic treatment. Summary of the Utility Model

[0005] The utility model provides a waste gas treatment device for formaldehyde-containing waste gas, which makes full use of the characteristics that formaldehyde is soluble in water and can be burned. After the formaldehyde in the waste gas is fully dissolved in water, it can be recycled again, and the excess formaldehyde can be safely burned and treated.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A waste gas treatment device for formaldehyde-containing waste gas, the waste gas treatment device includes:

[0008] A pretreatment mechanism, the pretreatment mechanism includes an induced draft fan, and the induced draft fan is respectively connected with an air inlet pipe and an exhaust pipe;

[0009] A water treatment mechanism, including a multi-stage waste gas dissolution chamber that is interconnected. The exhaust pipe is communicated to the inside of each stage of the waste gas dissolution chamber, and a plurality of exhaust ports are provided on the exhaust pipe placed inside each stage of the waste gas dissolution chamber;

[0010] A gas storage mechanism, the gas storage mechanism is communicated with the last stage of the waste gas dissolution chamber. At the same time, the gas storage mechanism is communicated with the air inlet pipe through a return pipe, and a return air valve is provided on the return pipe; and

[0011] Combustion mechanism, the combustion mechanism is communicated with the gas storage mechanism through a gas pipeline, and a regulating valve is arranged on the gas pipeline.

[0012] As a preferred embodiment of the above solution, a check component is arranged on the exhaust pipe.

[0013] As a preferred embodiment of the above solution, the check component includes a steel wool ball and a check valve located behind the steel wool ball.

[0014] As a preferred embodiment of the above solution, the waste gas dissolution chamber includes a water tank, and an automatic water replenishment component is arranged on the water tank.

[0015] As a preferred embodiment of the above solution, a formaldehyde concentration test component is arranged on the water tank, and an electromagnetic valve for controlling raw material recovery is also arranged below the water tank.

[0016] As a preferred embodiment of the above solution, the gas storage mechanism includes a gas storage tank, and a safety valve and a pressure gauge are arranged on the gas storage tank.

[0017] As a preferred embodiment of the above solution, the combustion mechanism includes a combustion chamber, a burner head connected to the gas pipeline is arranged on the combustion chamber, and a plurality of ventilation holes are arranged on the burner head.

[0018] As a preferred embodiment of the above solution, a combustion assisting groove is also arranged on the combustion chamber, and a feeding port is arranged outside the combustion assisting groove.

[0019] As a preferred embodiment of the above solution, the intake pipe is also connected with a supplementary air pipe, and a supplementary air valve is arranged on the supplementary air pipe; the return pipe is also connected with a nitrogen input pipe for inputting nitrogen, and a nitrogen input valve is arranged on the nitrogen input pipe.

[0020] Beneficial effects:

[0021] 1. Through the technical improvement of first treating the formaldehyde in the waste gas by water treatment and then burning it, the limitations of combustion conditions and the influence of fluctuations in the concentration and composition of formaldehyde waste gas are overcome, ensuring that formaldehyde gas can be fully burned and converted, and reducing the emission of incompletely treated formaldehyde.

[0022] 2. Effectively reduce the residual amount of formaldehyde waste gas and avoid its emission into the environment, causing damage to the ecological environment and human health. Description of the drawings

[0023] Figure 1 It is a structural schematic diagram of a combustion treatment device for formaldehyde.

[0024] Description of the drawings: 11. Induced draft fan; 12. Intake pipe; 13. Exhaust pipe; 131. Steel wool; 132. Check valve; 133. Exhaust port; 21. Water tank; 211. Automatic water replenishment component; 212. Formaldehyde concentration testing component; 213. Electromagnetic valve; 3. Return air pipe; 31. Return air valve; 4. Gas transmission pipe; 41. Regulating valve; 51. Gas storage tank; 511. Safety valve; 512. Pressure gauge; 61. Combustion chamber; 611. Burner head; 612. Combustion support tank; 613. Feeding port; 71. Air supply pipe; 711. Air supply valve; 81. Nitrogen transmission pipe; 811. Nitrogen transmission valve. Detailed implementation manners

[0025] Embodiment

[0026] As Figure 1 shown, this embodiment provides a waste gas treatment device for formaldehyde-containing waste gas, including a pretreatment mechanism, the pretreatment mechanism includes an induced draft fan 11, and the induced draft fan 11 is respectively connected with an intake pipe 12 and an exhaust pipe 13. A water treatment mechanism, including a multi-stage waste gas dissolution chamber that is interconnected, the exhaust pipe 13 communicates with the inside of each stage of the waste gas dissolution chamber, and a plurality of exhaust ports 133 are opened on the exhaust pipe 13 placed inside each stage of the waste gas dissolution chamber. A gas storage mechanism, the gas storage mechanism communicates with the last stage of the waste gas dissolution chamber, and at the same time, the gas storage mechanism communicates with the intake pipe 12 through a return air pipe 3, and a return air valve 31 is provided on the return air pipe 3; and a combustion mechanism, the combustion mechanism communicates with the gas storage mechanism through a gas transmission pipe 4, and a regulating valve 41 is provided on the gas transmission pipe 4. When in use, the production waste gas containing formaldehyde is transported from the intake pipe 12 into the pretreatment mechanism, and driven by the induced draft fan 11, the waste gas containing formaldehyde is then pressed into each stage of the waste gas dissolution chamber of the water treatment mechanism through the exhaust pipe 13. And a plurality of exhaust ports 133 are opened on the exhaust pipe 13 placed in each stage of the waste gas dissolution chamber, which is convenient for the waste gas to be discharged into the water through the discharge port 133. Formaldehyde will dissolve when it enters the waste gas dissolution chamber, and this embodiment discloses a multi-stage waste gas dissolution chamber, so that formaldehyde can be dissolved more fully, thereby reducing the concentration of formaldehyde and thus reducing the total amount of formaldehyde entering the combustion link, reducing the pressure and difficulty of combustion treatment.

[0027] The formaldehyde that has not been dissolved even after passing through the last stage of the waste gas dissolution chamber will enter the gas storage mechanism, and the gas storage mechanism will divert the formaldehyde. Part of the formaldehyde will enter the combustion mechanism through the regulating valve 41 of the gas transmission pipe 4 for combustion, and the formaldehyde is converted into harmless substances such as carbon dioxide and water through combustion, thereby completely eliminating the harm of formaldehyde to the environment and the human body. Another part of the unburned formaldehyde will enter the intake pipe 12 again when the return air valve 31 of the return air pipe 3 is opened, so as to achieve the cyclic treatment of formaldehyde.

[0028] In one embodiment, a check component is provided on the exhaust pipe 13. During the transmission of formaldehyde waste gas, pressure fluctuations or reverse airflows may occur due to various reasons. The check component can effectively prevent the generation of reverse airflows, ensuring that the formaldehyde waste gas always flows in a predetermined direction, avoiding the disorder of the treatment process, equipment damage, and potential safety risks caused by the reverse flow of formaldehyde waste gas.

[0029] As an alternative embodiment of the above technical solution, the check component includes a steel wool 131 and a check valve 132 located behind the steel wool 131. The steel wool 131 has a fine structure that can effectively block the reverse propagation of flames and high-temperature gases, while the check valve 132, through its own mechanical structure, remains open when normal airflows pass through, and can quickly respond and close once a reverse airflow appears, thus preventing the waste gas from flowing back. The steel wool 131 and the check valve 132 cooperate with each other to form a double guarantee, ensuring the reliability and safety during the entire formaldehyde treatment device process.

[0030] In one embodiment, in this formaldehyde combustion treatment device, the water pool 21 contained in the waste gas dissolution chamber provides a sufficient contact and dissolution environment for the formaldehyde waste gas. By absorbing and dissolving formaldehyde in water, the concentration of formaldehyde in the waste gas is reduced. The automatic water replenishment component 211 provided on the water pool 21 can monitor the water level in the water pool 21 in real time. When the water level drops to the set lower limit value, the automatic water replenishment component 211 will automatically start to replenish fresh water into the water pool 21 to maintain the water level in the water pool 21 within an appropriate range. The provision of the automatic water replenishment component 211 ensures that there is always enough water in the water pool 21 to dissolve the formaldehyde waste gas. Its automated operation mode reduces manual intervention and improves the operation efficiency of the entire treatment device. At the same time, appropriate water level control also helps to optimize the dissolution effect of formaldehyde and improve the treatment capacity of the entire treatment device for formaldehyde waste gas.

[0031] As an alternative implementation of the above technical solution, a formaldehyde concentration testing component 212 is provided on the water tank 21, and an electromagnetic valve 213 for controlling raw material recovery is further provided below the water tank 21. The formaldehyde concentration testing component 212 can monitor the concentration of the formaldehyde solution in the water tank 21 in real time. When the formaldehyde concentration testing component 212 detects that the concentration of the formaldehyde solution in the water tank 21 reaches the set recoverable threshold, the electromagnetic valve 213 will receive a signal and then automatically open. At this time, the solution rich in formaldehyde can flow through the electromagnetic valve into other containers and be reused as raw materials. When the formaldehyde concentration testing component 212 detects that the concentration of the formaldehyde solution in the water tank 21 is lower than the set recoverable threshold, the electromagnetic valve 213 will receive a signal and then automatically close. Through the cooperation of the formaldehyde concentration testing component 212 and the electromagnetic valve 213 for controlling raw material recovery, not only the effective recycling of resources is realized, the production cost is reduced, but also the emission of waste is reduced.

[0032] In one embodiment, the gas storage mechanism includes a gas storage tank 51, and a safety valve 511 and a pressure gauge 512 are provided on the gas storage tank 51. The pressure gauge 512 can display the gas pressure inside the gas storage tank 51 in real time. By observing the reading of the pressure gauge 512, the operator can intuitively understand the working state of the gas storage tank 51. If the pressure is too high or too low, the operator can take corresponding measures for adjustment and treatment. When the pressure inside the gas storage tank 51 exceeds the preset safety threshold, the safety valve 511 will automatically open and quickly release the excess gas, thereby preventing dangerous situations such as the rupture or even explosion of the gas storage tank 51 caused by too high pressure. Through the coordinated action of the safety valve 511 and the pressure gauge 512, the gas storage mechanism can be effectively guaranteed to operate within a safe pressure range.

[0033] In one embodiment, the combustion mechanism includes a combustion chamber 61, and a burner head 611 connected to the gas pipeline 4 is provided on the combustion chamber 61. A plurality of ventilation holes are distributed on the burner head 611, and the exhaust gas enters the combustion chamber 61 through the ventilation holes. The setting of the plurality of ventilation holes increases the degree of gas dispersion.

[0034] As an alternative embodiment of the above technical solution, a combustion assisting groove 612 is further provided on the combustion chamber 61, and a feeding port 613 is arranged outside the combustion assisting groove 612. The existence of the combustion assisting groove 612 provides additional assistance for the combustion process. During the combustion startup stage or when the concentration of formaldehyde waste gas is low, through the feeding port 613 provided on the combustion assisting groove 612, combustion aids such as waste oil, diesel, kerosene, wax, etc. can be conveniently added into the combustion assisting groove 612. In the initial stage of ignition, the combustion aid is added into the combustion assisting groove 612 from the feeding port 613 and ignited, and the heat generated by its combustion can quickly increase the temperature of the combustion chamber 61. When the temperature of the combustion chamber 61 reaches a certain level and the formaldehyde waste gas starts to burn fully, the addition amount of the combustion aid can be gradually reduced according to the actual combustion situation.

[0035] As an alternative embodiment of the above technical solution, the air inlet pipe 12 is further connected with a supplementary air pipe 71, and a supplementary air valve 711 is arranged on the supplementary air pipe 71; during the combustion process, according to the oxygen demand in the combustion chamber 61 and the changes in the flow rate and composition of the waste gas, the supplementary air valve 711 can automatically adjust the opening degree to ensure that the amount of gas entering the system is just right.

[0036] Meanwhile, the return air pipe 3 is further connected with a nitrogen input pipe 81 for inputting nitrogen, and a nitrogen input valve 811 is arranged on the nitrogen input pipe 81. As an inert gas, on the one hand, the input of nitrogen can dilute the waste gas in the return air pipe 3 and reduce the concentration of combustible gases, thereby effectively preventing the tail gas from reaching the explosion limit and reducing the safety risk. On the other hand, the inert property of nitrogen can, to a certain extent, inhibit the excessive progress of the combustion reaction, avoid out-of-control combustion, and play a role in stabilizing the operation of the system. Through the coordinated action of the supplementary air pipe 71 and the nitrogen input pipe 81, the gas composition and pressure balance in the treatment device can be better adjusted, ensuring the safe operation of the formaldehyde combustion treatment device.

[0037] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A device for treating waste gas containing formaldehyde, characterized in that: The exhaust gas treatment device comprises: A pre-treatment mechanism, the pre-treatment mechanism comprising an induced draft fan (11), the induced draft fan (11) being respectively connected to an air intake pipe (12) and an air exhaust pipe (13); The water treatment mechanism comprises a plurality of mutually connected waste gas dissolution chambers, wherein the exhaust pipe (13) is connected to the interior of each waste gas dissolution chamber, and the exhaust pipe (13) disposed inside each waste gas dissolution chamber is provided with a plurality of exhaust ports (133); An air storage mechanism, the air storage mechanism being connected to the waste gas dissolution chamber of the last stage, and the air storage mechanism being connected to the air intake pipe (12) via an air return pipe (3), and an air return valve (31) being provided on the air return pipe (3); and A combustion mechanism is connected to the gas storage mechanism via an air delivery pipe (4), and a regulating valve (41) is provided on the air delivery pipe (4).

2. The exhaust gas treatment device according to claim 1, characterized in that: The exhaust pipe (13) is provided with a non-return assembly.

3. The exhaust gas treatment device according to claim 2, characterized in that: The check assembly comprises a steel ball (131) and a check valve (132) located behind the steel ball (131).

4. The exhaust gas treatment device according to claim 1, characterized in that: The waste gas dissolution chamber comprises a water pool (21), and an automatic water replenishment component (211) is arranged on the water pool (21).

5. The exhaust gas treatment device according to claim 4, characterized in that: A formaldehyde concentration testing component (212) is provided on the water pool (21), and an electromagnetic valve (213) for controlling raw material recovery is also provided below the water pool (21).

6. The exhaust gas treatment device according to claim 1, characterized in that: The gas storage mechanism comprises a gas storage tank (51), and the gas storage tank (51) is provided with a safety valve (511) and a pressure gauge (512).

7. The exhaust gas treatment device according to claim 1, characterized in that: The combustion mechanism comprises a combustion chamber (61), the combustion chamber (61) is provided with a burner (611) connected to a gas delivery pipe (4), and the burner (611) is provided with a plurality of ventilation holes.

8. The exhaust gas treatment device according to claim 7, characterized in that: The combustion chamber (61) is also provided with a combustion-supporting groove (612), and a material adding port (613) is provided outside the combustion-supporting groove (612).

9. The exhaust gas treatment device according to claim 8, characterized in that: The air inlet pipe (12) is also connected to an air supply pipe (71), and an air supply valve (711) is provided on the air supply pipe (71); the air return pipe (3) is also connected to a nitrogen delivery pipe (81) for inputting nitrogen, and the nitrogen delivery pipe (81) is provided with a nitrogen delivery valve (811).

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