Sodium hypophosphite tail gas treatment device

Abstract

The utility model discloses a sodium hypophosphite tail gas treatment device which comprises a combustion furnace, a combustor and a spray chamber, a fuel inlet of the combustor is connected with a sodium hypophosphite tail gas pipeline, and an outlet of the combustor is connected with the inlet end of the combustion furnace; the inlet end of the combustion furnace is also connected with other tail gas inlet pipelines; a heat accumulator is mounted in an inner cavity of the combustion furnace; and the hole diameter of the heat accumulator at the inlet end of the combustion furnace is smaller than that of the heat accumulator at the outlet end of the combustion furnace. Through the design of the combustion furnace, the combustor and the spraying chamber and the design of the heat accumulator in the combustion furnace, hydrogen phosphide tail gas is fully combusted, the passing time of other tail gas is prolonged, the other tail gas is oxidized after being fully burnt and baked at a high temperature and then is sprayed and absorbed, the tail gas treatment effect is improved, pollutant emission is reduced, and the energy-saving and environment-friendly effects are achieved. The environment is protected.

Description

Technical Field

[0001] This utility model relates to the field of exhaust gas treatment technology, and in particular to a sodium hypophosphite exhaust gas treatment device. Background Technology

[0002] The production of sodium hypophosphite generates phosphine tail gas, which also contains a small amount of phosphine and a certain amount of hydrogen. It will spontaneously combust upon contact with air, posing a high risk and must be effectively treated before being discharged.

[0003] Current treatment methods generally involve feeding the phosphine tail gas along with other tail gases from the workshop into a combustion furnace. Phosphine and hydrogen burn in the furnace to produce phosphorus pentoxide and water. The other tail gases are then subjected to high-temperature burning and baking in the phosphine flame before finally entering a spray system for absorption. However, because the flame is dispersed during phosphine combustion, it leads to incomplete combustion and a low furnace temperature. This results in the other tail gases having too short a residence time in the furnace, failing to be fully burned and baked, thus remaining unoxidized and polluting the environment upon emission. Utility Model Content

[0004] This invention provides a sodium hypophosphite tail gas treatment device, which can solve the above-mentioned problems existing in the phosphine tail gas treatment process in the prior art.

[0005] To solve the above-mentioned technical problems, this utility model provides a sodium hypophosphite tail gas treatment device, including: a combustion furnace, a burner, and a spray chamber;

[0006] The fuel inlet of the burner is connected to the sodium hypophosphite tail gas pipeline, and its outlet is connected to the inlet end of the combustion furnace.

[0007] The inlet end of the combustion furnace is also connected to other exhaust gas inlet pipes; a heat storage body is installed in the internal cavity of the combustion furnace;

[0008] The diameter of the accumulator at the inlet end of the combustion furnace is smaller than the diameter at the outlet end of the combustion furnace.

[0009] In a preferred embodiment of the present invention, a conical flame stabilizer is installed at the outlet of the burner, and the conical flame stabilizer extends into the combustion furnace.

[0010] In a preferred embodiment of the present invention, from the inlet end to the outlet end of the combustion furnace, the heat storage body includes a first heat storage body, a second heat storage body and a third heat storage body arranged in parallel; the first heat storage body, the second heat storage body and the third heat storage body are all honeycomb heat storage bodies with a cubic structure.

[0011] In a preferred embodiment of the present invention, the wall thickness of the first heat storage body, the second heat storage body, and the third heat storage body is 0.5 mm, wherein the side length of the honeycomb pores of the first heat storage body is 2 mm, the side length of the honeycomb pores of the second heat storage body is 3 mm, and the side length of the honeycomb pores of the third heat storage body is 4 mm.

[0012] In a preferred embodiment of the present invention, a first temperature sensor and a second temperature sensor are respectively installed in the combustion furnace on the front side of the first heat storage body and the rear side of the third heat storage body.

[0013] In a preferred embodiment of the present invention, the device further includes a program controller, which is connected to the first temperature sensor and the second temperature sensor; the first temperature sensor and the second temperature sensor are linked to the air-fuel ratio regulating valve of the burner through the program controller.

[0014] In a preferred embodiment of the present invention, the combustion furnace is arranged at an angle with the outlet end higher than the inlet end, and a discharge port is also provided at the bottom of the inlet end of the combustion furnace.

[0015] In a preferred embodiment of this utility model, the tilt angle of the combustion furnace is 1 to 5°.

[0016] In a preferred embodiment of this utility model, the combustion furnace is further provided with an insulation layer.

[0017] In a preferred embodiment of this invention, a water seal tank and a THPX reactor are also installed between the sodium hypophosphite tail gas pipeline and the fuel inlet of the burner.

[0018] The beneficial effects of this utility model are as follows: This utility model provides a sodium hypophosphite tail gas treatment device. Through the design of the combustion furnace, burner, and spray chamber, as well as the design of the heat storage body in the combustion furnace, the phosphine tail gas is fully combusted, the passage time of other tail gases is extended, and the other tail gases are fully oxidized after being heated and baked at high temperature before being sprayed and absorbed, thereby improving the tail gas treatment effect, reducing pollutant emissions, and protecting the environment. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural schematic diagram of a preferred embodiment of a sodium hypophosphite tail gas treatment device according to the present invention;

[0020] The components in the attached diagram are labeled as follows:

[0021] 10. Water seal tank; 20. THPX reactor; 30. Burner; 31. Fuel inlet; 32. Conical flame stabilizer; 40. Combustion furnace; 41. Insulation layer; 42. First temperature sensor; 43. Second temperature sensor; 50. Spray chamber; 60. Phosphine tail gas pipeline; 70. Other tail gas inlet pipelines; 80. Heat storage body; 81. First heat storage body; 82. Second heat storage body; 83. Third heat storage body. Detailed Implementation

[0022] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more precise definition of the protection scope of the present invention.

[0023] Please see Figure 1 The embodiments of this utility model include:

[0024] Example 1

[0025] This utility model discloses a sodium hypophosphite tail gas treatment device, including: a water seal tank 10, a THPX (tetrahydroxymethyl series, such as tetrahydroxymethyl phosphorus chloride, tetrahydroxymethyl phosphorus phosphate) reactor 20, a burner 30, a combustion furnace 40, and a spray chamber 50.

[0026] The inlet of the water-sealed tank 10 is connected to the phosphine tail gas pipeline 60, and its outlet is connected to the THPX reactor 20 via a pipeline. The phosphine tail gas pipeline 60 is first connected to the water-sealed tank 10. Through the water seal effect of the water-sealed tank 10, the phosphine tail gas is cooled and water-soluble impurities in the tail gas are removed. The phosphine tail gas discharged from the water-sealed tank 10 is then introduced into the THPX reactor 20.

[0027] Specifically, the THPX reactor 20 is equipped with an inlet, an outlet, a liquid inlet, and a liquid outlet. Internally, it contains a gas distributor and a bed filled with an acidic catalyst (such as hydrochloric acid or sulfuric acid). Phosphine tail gas discharged from the water seal tank 10 is introduced into the THPX reactor 20 and reacts with formaldehyde solution introduced through the liquid inlet under the action of a catalyst to produce products such as tetramethylphosphine chloride (THPC) or tetramethylphosphine sulfate (THPS). This process transforms some of the phosphine gas in the tail gas into raw materials for valuable chemical products. On the one hand, it turns waste into treasure, improving resource utilization; on the other hand, it reduces the amount of phosphine tail gas introduced into the burner at the source, lowering subsequent tail gas treatment costs. The reacted gas undergoes gas-liquid separation within the reactor, and unreacted phosphine is discharged from the outlet.

[0028] The gas outlet of the THPX reactor 20 is connected to the fuel inlet 31 of the burner 30 via a pipe. The outlet of the burner 30 is connected to the inlet end of the combustion furnace 40. The inlet end of the combustion furnace 40 is also connected to other exhaust gas inlet pipes 70, the outlet end of which is connected to the spray chamber 50. A heat storage body 80 is installed in the internal cavity of the combustion furnace 40. Specifically, the width of the heat storage body 80 is the same as the inner diameter of the combustion furnace 40, and its length is less than the length of the combustion furnace 40. The heat storage body 80 has a three-section structure, from the inlet end to the outlet end of the combustion furnace 40. The heat storage body 80 includes a first heat storage body 81, a second heat storage body 82, and a third heat storage body 83 arranged side-by-side in sequence. The first heat storage body 81, the second heat storage body 82, and the third heat storage body 83 are all cubic honeycomb heat storage bodies, and the wall thickness of their honeycomb pores is 0.5 mm. The pore diameter of the first heat storage body 81, the second heat storage body 82, and the third heat storage body 83 gradually increases. Specifically, the side length of the honeycomb pores in the first heat storage body 81 is 2 mm, the side length of the honeycomb pores in the second heat storage body 82 is 3 mm, and the side length of the honeycomb pores in the third heat storage body 83 is 4 mm. Since phosphorus pentoxide, a product of phosphine combustion, condenses from a gaseous state into a solid state at low temperatures, the heat storage body 80 is designed with a three-section structure and a honeycomb pore structure that gradually increases in size (i.e., the pore diameter gradually increases). This design can prevent the heat storage body from becoming blocked due to local temperature drops in the middle and end of the heat storage body under abnormal conditions.

[0029] Unused phosphine tail gas from the THPX reactor 20 is discharged and then enters the burner 30 for complete combustion, generating phosphorus pentoxide and water vapor, which is then injected onto the heat storage medium 80 within the combustion furnace 40, ensuring complete combustion of the phosphine gas. Other gases in the workshop are introduced into the combustion furnace 40 through the other tail gas inlet pipe 70, where they are heated and baked at high temperatures within the heat storage medium 80, with the baking time extended. This effectively reduces the possibility of unoxidized tail gas, thereby reducing pollutant emissions and purifying the ecological environment.

[0030] The combustion furnace 40 is also equipped with an insulation layer 41 on the outside, which can improve the temperature stability inside the combustion furnace 40, ensure that phosphorus pentoxide can be discharged stably, and also ensure that other exhaust gases can be fully burned and baked at high temperature in the phosphine flame.

[0031] In addition, a conical flame stabilizer 32 is installed at the outlet of the burner 30, and the conical flame stabilizer 32 extends into the combustion furnace 40. The conical flame stabilizer 32 can widen the flame injection angle, so that the heat storage body 80 in the combustion furnace 40 is heated evenly, thereby improving the exhaust gas treatment effect.

[0032] A first temperature sensor 42 is installed in front of the first heat storage body 81 inside the combustion furnace 40, and a second temperature sensor 43 is installed behind the third heat storage body 83. The device also includes a program controller, which is connected to the first temperature sensor 42 and the second temperature sensor 43. The first temperature sensor 42 and the second temperature sensor 43 are linked to the air-fuel ratio regulating valve of the burner 30 through the program controller. That is, by monitoring the temperature of the flue gas behind the combustion furnace and the heat storage body, the combustion effect of the burner 30 is adjusted to maintain the temperature of the flue gas behind the combustion furnace and the heat storage body within a set range, ensuring that phosphine tail gas and other tail gas can be effectively oxidized.

[0033] The combustion furnace 40 is installed in a horizontally inclined manner, that is, with its outlet end higher than its inlet end, and the inclination angle is controlled between 1° and 5°, preferably 2°. A discharge port 44 is also provided at the bottom of the inlet end of the combustion furnace 40. This arrangement of the combustion furnace 40 ensures that, under abnormal operating conditions, the cooled liquid inside the combustion furnace can be discharged in a timely manner after cooling.

[0034] This invention, through the design of the burner and the heat storage body inside the combustion furnace, enables the phosphine tail gas to be fully combusted, prolongs the passage time of other tail gases, and allows the other tail gases to be fully oxidized after being burned and baked at high temperature, thereby improving the tail gas treatment effect, reducing pollutant emissions, and protecting the environment.

[0035] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A sodium hypophosphite tail gas treatment device, characterized in that, include: Combustion furnace, burner, and spray chamber; The fuel inlet of the burner is connected to the sodium hypophosphite tail gas pipeline, and its outlet is connected to the inlet end of the combustion furnace. The inlet end of the combustion furnace is also connected to other exhaust gas inlet pipes; a heat storage body is installed in the internal cavity of the combustion furnace; The diameter of the accumulator at the inlet end of the combustion furnace is smaller than the diameter at the outlet end of the combustion furnace.

2. The sodium hypophosphite tail gas treatment device according to claim 1, characterized in that, A conical flame stabilizer is installed at the outlet of the burner, and the conical flame stabilizer extends into the combustion furnace.

3. The sodium hypophosphite tail gas treatment device according to claim 1, characterized in that, From the inlet end to the outlet end of the combustion furnace, the heat storage body includes a first heat storage body, a second heat storage body, and a third heat storage body arranged side by side in sequence; the first heat storage body, the second heat storage body, and the third heat storage body are all honeycomb heat storage bodies with a cubic structure.

4. The sodium hypophosphite tail gas treatment device according to claim 3, characterized in that, The wall thickness of the first, second, and third heat storage bodies is 0.5 mm. The side length of the honeycomb pores in the first heat storage body is 2 mm, the side length of the honeycomb pores in the second heat storage body is 3 mm, and the side length of the honeycomb pores in the third heat storage body is 4 mm.

5. The sodium hypophosphite tail gas treatment device according to claim 4, characterized in that, A first temperature sensor and a second temperature sensor are respectively installed in the combustion furnace, located in front of the first heat storage body and behind the third heat storage body.

6. The sodium hypophosphite tail gas treatment device according to claim 5, characterized in that, The device further includes a program controller, which is connected to the first temperature sensor and the second temperature sensor; the first temperature sensor and the second temperature sensor are linked to the air-fuel ratio regulating valve of the burner through the program controller.

7. The sodium hypophosphite tail gas treatment device according to claim 1, characterized in that, The combustion furnace is arranged at an angle with the outlet end higher than the inlet end, and a discharge port is also provided at the bottom of the inlet end of the combustion furnace.

8. The sodium hypophosphite tail gas treatment device according to claim 7, characterized in that, The inclination angle of the combustion furnace is 1 to 5°.

9. A sodium hypophosphite tail gas treatment device according to claim 1, 7, or 8, characterized in that, The combustion furnace is also equipped with an insulation layer.

10. A sodium hypophosphite tail gas treatment device according to any one of claims 1-8, characterized in that, A water seal tank and a THPX reactor are also installed between the sodium hypophosphite tail gas pipeline and the fuel inlet of the burner.

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