A reaction kettle for sodium hypochlorite production and use method thereof

Abstract

The invention discloses a reactor for sodium hypochlorite production and a method for using the reactor, comprising a material preparation unit, a reactor, a storage tank and a temperature control unit, wherein the material preparation unit, the temperature control unit and the storage tank are all connected to the reactor; a first partition, a second partition, a third partition and a plurality of reaction tubes are arranged in the tank body of the reactor, and the first partition, the second partition and the third partition are fixed in the tank body in sequence, and the tank body is divided into a liquid inlet bin, a liquid outlet bin, a temperature adjustment bin and a transmission bin. By arranging a rotatable reaction tube in the reactor, arranging a spiral wing in the reaction tube, and driving the reaction tube to rotate by a driving device, the spiral wing can increase the flow path of the sodium hydroxide solution during the reaction, and the reaction tube can also accelerate the flow of the airflow through the spiral wing when rotating, and since adjacent reaction tubes are meshed and connected by a gear ring, the rotation of adjacent reaction tubes is opposite, and a circulation can be established between the liquid inlet bin and the liquid outlet bin, thereby improving the reaction efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of sodium hypochlorite production, and in particular relates to a reaction kettle for sodium hypochlorite production and a use method thereof. Background Art

[0002] Sodium hypochlorite is an inorganic compound with the chemical formula NaClO. It is a hypochlorite, as well as a highly efficient oxidant and chlorine-containing disinfectant. It can be mixed with water in any proportion and is widely used in the disinfection of tap water, grey water, circulating water, swimming pool water, hospital sewage and other water bodies. It has a wide range of applications in life and industry.

[0003] At present, when sodium hypochlorite is produced by alkaline solution chlorination method, the chlorine gas in the reactor has poor fluidity, resulting in low reaction efficiency. At the same time, since a large amount of heat is generated when chlorine gas reacts with sodium hydroxide solution, overheating will also lead to reduced reaction efficiency.

[0004] Therefore need us to design a kind of sodium hypochlorite production reactor and its use method, to solve these problems. Summary of the invention

[0005] The problem to be solved by the present invention is to provide a reaction kettle for producing sodium hypochlorite and a method for using the same, and in particular, the reaction efficiency can be improved when sodium hypochlorite is produced by an alkaline solution chlorination method.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A reaction kettle for sodium hypochlorite production, comprising a material preparation unit, a reaction kettle, a storage tank and a temperature control unit, wherein the material preparation unit, the temperature control unit and the storage tank are all connected to the reaction kettle;

[0008] The tank body of the reactor is provided with a first partition, a second partition, a third partition and a plurality of reaction tubes. The first partition, the second partition and the third partition are fixed in sequence in the tank body to divide the tank body into a liquid inlet bin, a liquid outlet bin, a temperature adjustment bin and a transmission bin. The transmission bin is located between the first partition and the second partition, and the temperature adjustment bin is located between the second partition and the third partition. The liquid inlet bin is located on one side of the first partition, and the liquid outlet bin is located on one side of the third partition. Spiral wings are fixedly provided on the inner wall of the reaction tube, and the reaction tube passes through the first partition, the second partition and the third partition. A plurality of heat sinks are fixedly sleeved on the reaction tube located in the temperature adjustment bin. Gear rings are provided on the reaction tubes in the transmission bin, and the plurality of reaction tubes are meshed one by one through the gear rings. A driving gear is also rotatably provided in the transmission bin, and the driving gear meshes with one of the gear rings. A driving device is provided on the top of the reactor, and the output end of the driving device is connected to the driving gear.

[0009] Preferably, the material preparation unit includes a water treatment device, a mixing tank and a liquid supply pump, the water treatment device is connected to the mixing tank through a water outlet pipe, the mixing tank is connected to the liquid inlet bin through a liquid supply pipe, and the liquid supply pump is installed on the liquid supply pipe.

[0010] Preferably, the temperature control unit includes a temperature control device, an inlet pipe, an outlet pipe and a circulation pump, one end of the inlet pipe and the outlet pipe are connected to the temperature control device, and the other end is connected to the temperature control chamber, and the circulation pump is arranged on the inlet pipe.

[0011] Preferably, a discharge pipe is fixedly provided on the storage tank, and a free end of the discharge pipe is connected to the liquid discharge bin.

[0012] Preferably, a filter plate is fixedly provided in the liquid outlet bin, and a polymer membrane is bonded to the bottom of the filter plate; an air inlet pipe is also provided on the tank body, the air inlet pipe is connected to the liquid outlet bin, and the air inlet pipe is located above the filter plate, and the discharge pipe is located below the filter plate.

[0013] Preferably, sealing rings are provided at the connections between the reaction tube and the first partition plate, the second partition plate and the third partition plate.

[0014] Preferably, a temperature sensor is further provided in the temperature regulating chamber, and an output end of the temperature sensor is electrically connected to the temperature regulating device and the circulation pump.

[0015] Preferably, the driving device is connected to the driving gear via a transmission rod.

[0016] A method for using a reaction kettle for sodium hypochlorite production comprises the following steps:

[0017] S1. Dissolve sodium hydroxide in water in a mixing tank to prepare a sodium hydroxide solution, and deliver the sodium hydroxide solution to a liquid inlet bin through a feed pump, so that the sodium hydroxide solution flows downward along the inner wall of the reaction tube and the spiral wing, and at the same time, pass chlorine gas into the liquid outlet bin through an air inlet pipe;

[0018] S2, start the temperature control device and the circulation pump, and adjust the temperature of the device temperature to a temperature suitable for the reaction of sodium hydroxide solution and chlorine gas;

[0019] S3, start the driving device to rotate the reaction tube, and use the spiral fins to drive the internal chlorine gas to flow;

[0020] S4. The reaction tubes meshing with each other through the gear rings rotate in opposite directions, and the internal gas flows in opposite directions, forming a circulating airflow between the liquid inlet bin and the liquid outlet bin. The sodium hydroxide solution flowing through the reaction tube reacts with the chlorine gas to generate sodium hypochlorite solution, which drips from the bottom of the reaction tube into the liquid outlet bin and finally flows into the storage tank through the discharge pipe.

[0021] Preferably, the sodium hypochlorite solution generated in step S4 passes through a filter plate and a polymer membrane in sequence before entering the liquid outlet bin to filter and separate by-products generated during the reaction.

[0022] The advantages and positive effects of the present invention are:

[0023] The present invention arranges a rotatable reaction tube in a reaction kettle, arranges spiral wings in the reaction tube, and drives the reaction tube to rotate through a driving device. During the reaction, the spiral wings can increase the flow path of the sodium hydroxide solution, and the spiral wings can also accelerate the flow of the airflow when the reaction tube rotates. Moreover, since adjacent reaction tubes are meshed and connected through a gear ring, the rotation directions of adjacent reaction tubes are opposite, so that a circulation can be established between a liquid inlet bin and a liquid outlet bin, thereby improving the reaction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0025] Figure 1 It is a schematic diagram of the overall connection of the system of the present invention;

[0026] Figure 2 It is a schematic cross-sectional view of the internal structure of the reactor of the present invention;

[0027] Figure 3 It is a schematic cross-sectional view of the internal structure of the transmission compartment of the present invention.

[0028] The following are the descriptions of the reference numerals:

[0029] 1. Main water pipe; 2. Water treatment device; 3. Water outlet pipe; 4. Mixing tank; 5. Liquid supply pipe; 6. Liquid supply pump; 7. Reactor; 701. Tank body; 702. First baffle; 703. Second baffle; 704. Driving device; 705. Transmission rod; 706. Driving gear; 707. Gear ring; 708. Reactor tube; 709. Helical wing; 710. Liquid inlet bin; 711. Liquid outlet bin; 712. Temperature control bin; 713. Third baffle; 714. Filter plate; 715. Transmission bin; 716. Temperature sensor; 717. Polymer membrane; 718. Heat sink; 8. Discharge pipe; 9. Temperature control device; 10. Inflow pipe; 11. Outflow pipe; 12. Circulation pump; 13. Storage tank; 14. Inlet pipe. DETAILED DESCRIPTION

[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0032] The present invention will be further described below in conjunction with the accompanying drawings:

[0033] Example 1: Figure 1-Figure 3 As shown, a reaction kettle for sodium hypochlorite production includes a material preparation unit, a reaction kettle 7, a storage tank 13 and a temperature control unit, wherein the material preparation unit, the temperature control unit and the storage tank 13 are all connected to the reaction kettle 7;

[0034] The tank body 701 of the reactor 7 is provided with a first partition 702, a second partition 703, a third partition 713 and a plurality of reaction tubes 708. The first partition 702, the second partition 703 and the third partition 713 are fixed in the tank body 701 in sequence, and the tank body 701 is divided into a liquid inlet bin 710, a liquid outlet bin 711, a temperature adjustment bin 712 and a transmission bin 715. The transmission bin 715 is located between the first partition 702 and the second partition 703, the temperature adjustment bin 712 is located between the second partition 703 and the third partition 713, the liquid inlet bin 710 is located on one side of the first partition 702, the liquid outlet bin 711 is located on one side of the third partition 713, and the reaction tubes 708 are provided. A spiral wing 709 is fixedly arranged on the inner wall of 708, and the reaction tube 708 passes through the first partition plate 702, the second partition plate 703 and the third partition plate 713. A plurality of heat sinks 718 are fixedly mounted on the reaction tube 708 in the temperature control chamber 712. A gear ring 707 is arranged on each of the reaction tubes 708 in the transmission chamber 715. The plurality of reaction tubes 708 are meshed and connected one by one through the gear ring 707. A driving gear 706 is also rotatably arranged in the transmission chamber 715, and the driving gear 706 is meshed with one of the gear rings 707. A driving device 704 is arranged on the top of the reactor 7, and the output end of the driving device 704 is connected to the driving gear 706.

[0035] Specifically, the material preparation unit includes a water treatment device 2, a mixing tank 4 and a liquid supply pump 6. The water treatment device 2 is connected to the mixing tank 4 through a water outlet pipe 3. The mixing tank 4 is connected to the liquid inlet tank 710 through a liquid supply pipe 5. The liquid supply pump 6 is installed on the liquid supply pipe 5.

[0036] Specifically, the temperature control unit includes a temperature control device 9, an inlet pipe 10, an outlet pipe 11 and a circulation pump 12. One end of the inlet pipe 10 and the outlet pipe 11 are connected to the temperature control device 9, and the other end is connected to the temperature control chamber 712. The circulation pump 12 is arranged on the inlet pipe 10.

[0037] Specifically, a discharge pipe 8 is fixedly provided on the storage tank 13 , and a free end of the discharge pipe 8 is communicated with the liquid discharge bin 711 .

[0038] Specifically, a filter plate 714 is fixedly installed in the liquid outlet bin 711, and a polymer membrane 717 is attached to the bottom of the filter plate 714; an air inlet pipe 14 is also provided on the tank body 701, and the air inlet pipe 14 is connected to the liquid outlet bin 711, and the air inlet pipe 14 is located above the filter plate 714, and the discharge pipe 8 is located below the filter plate 714.

[0039] Specifically, sealing rings are provided at the connection points between the reaction tube 708 and the first partition plate 702 , the second partition plate 703 and the third partition plate 713 .

[0040] Specifically, a temperature sensor 716 is further provided in the temperature regulating chamber 712 , and an output end of the temperature sensor 716 is electrically connected to the temperature regulating device 9 and the circulation pump 12 .

[0041] Specifically, the driving device 704 is connected to the driving gear 706 via a transmission rod 705 .

[0042] A method for using a reaction kettle for sodium hypochlorite production comprises the following steps:

[0043] S1, dissolving sodium hydroxide in water in a mixing tank 4 to prepare a sodium hydroxide solution, and delivering the sodium hydroxide solution to a liquid inlet bin 710 through a feed pump, so that the sodium hydroxide solution flows downward along the inner wall of the reaction tube 708 and the spiral wing 709, and at the same time, chlorine gas is introduced into a liquid outlet bin 711 through an air inlet pipe 14;

[0044] S2, start the temperature control device 9 and the circulating pump 12, and adjust the temperature of the device temperature to a temperature suitable for the reaction of sodium hydroxide solution and chlorine gas;

[0045] S3, start the driving device 704 to rotate the reaction tube 708, and use the spiral fins 709 to drive the internal chlorine gas to flow;

[0046] S4. The reaction tubes 708 meshing with each other through the gear ring 707 rotate in opposite directions, and the internal gas flows in opposite directions, forming a circulating airflow between the liquid inlet bin 710 and the liquid outlet bin 711. The sodium hydroxide solution flowing through the reaction tube 708 reacts with the chlorine gas to generate a sodium hypochlorite solution, which drips from the bottom of the reaction tube 708 into the liquid outlet bin 711 and finally flows into the storage tank 13 through the discharge pipe 8.

[0047] Specifically, the sodium hypochlorite solution generated in step S4 will pass through the filter plate 714 and the polymer membrane 717 in sequence before entering the liquid outlet bin 711 to filter and separate the by-products generated during the reaction.

[0048] The working process of this embodiment is as follows: when in use, first, water required for preparing sodium hypochlorite is sent to the water treatment device 2 for treatment through the main water pipe 1. The water treatment device 2 is used to soften water. The softened water can effectively reduce the formation of scale and extend the service life of the equipment. Then, the softened water in the water treatment device 2 is sent to the mixing tank 4 through the outlet pipe 3. Sodium hydroxide is added to the mixing tank 4 to form a 12% to 15% sodium hydroxide solution after mixing. Then, the sodium hydroxide solution is transported to the liquid inlet bin 710 in the reactor 7 through the liquid supply pipe 5 by the liquid supply pump 6.

[0049] When the sodium hydroxide solution is transported to the liquid inlet bin 710, the driving device 704 installed on the tank body 701 is started. The driving device 704 is preferably a motor. After the motor rotates, it can drive the driving gear 706 to rotate through the transmission rod 705. After the driving gear 706 rotates, it will drive the meshing ring gear 707 to rotate. The ring gear 707 is fixedly mounted on the reaction tube 708, and the reaction tube 708 is rotatably connected to the first partition plate 702, the second partition plate 703 and the third partition plate 713. Therefore, the reaction tube 708 can be driven to rotate through the cooperation of the ring gear 707 and the driving gear 706. The ring gears 707 on the reaction tube 708 are meshed together one by one, so the reaction tubes 708 meshed with each other through the ring gears 707 rotate in opposite directions. Therefore, after the reaction tube 708 rotates, it can be driven by the spiral wings 709 inside the reaction tube 708, which will rotate between the liquid inlet bin 710 and the outlet bin 710. An air flow circulation is formed between the liquid bins 711; therefore, a small amount of sodium hydroxide can be controlled by the liquid supply pump 6 to enter the liquid inlet bin 710, and the sodium hydroxide entering the liquid inlet bin 710 will flow downward along the inner wall of the rotating tube and the spiral wing 709. At the same time, the chlorine gas entering the liquid outlet bin 711 through the air inlet pipe 14 will flow along the reaction tube 708 to the liquid inlet bin 710 under the action of the spiral wing 709 in a part of the reaction tube 708. In the process of the chlorine gas flowing from the liquid outlet bin 711 to the liquid inlet bin 710 along a part of the reaction tube 708, it will react with the sodium hydroxide solution flowing into the reaction tube 708 to produce sodium hypochlorite, sodium chloride and water. The reaction product will continue to flow along the reaction tube 708 to the liquid outlet bin 711, and the chlorine gas that has not reacted completely will flow from the liquid inlet bin 710 to the liquid outlet bin 711 under the action of another part of the reaction tube 708 after entering the liquid inlet bin 710 to form a circulation.

[0050] Because heat is generated when chlorine enters the reaction tube 708 and reacts with the sodium hydroxide solution, a heat-conducting medium is input into the temperature-control chamber 712 before the reaction. When the chlorine and the sodium hydroxide solution react in the reaction tube 708 to increase the temperature of the reaction tube 708, the temperature of the heat sink 718 will also increase. At this time, the heat will be transferred to the heat-conducting medium in the temperature-control chamber 712. When the temperature sensor 716 in the temperature-control chamber 712 detects that the temperature of the heat-conducting medium has increased, it will transmit a signal to the temperature control device 9. The temperature control device 9 will cool the heat-conducting medium, and then circulate it with the heat-conducting medium in the temperature-control chamber 712 through the circulation pump 12 to avoid the reaction temperature being too high and causing the reaction rate to decrease.

[0051] In this embodiment, the heat transfer medium is preferably heat transfer oil, and water may be used instead under the premise of controlling costs; the heat sink 718 is an aluminum circular plate with a through hole in the middle, the inner diameter of the through hole is the same as the outer diameter of the reaction tube 708, and is fixed to the reaction tube 708 by welding.

[0052] Because the sodium hypochlorite, sodium chloride and water generated by the reaction in the reaction tube 708 are mixed together, they will drip onto the filter plate 714 after flowing out of the reaction tube 708, and pass through the filter plate 714 and the polymer membrane 717 in sequence under the action of gravity. The filter plate 714 and the polymer membrane 717 will filter the impurities in the mixed liquid respectively, so that the relatively pure filtrate after impurity removal flows into the liquid outlet bin 711, and flows into the storage tank 13 through the discharge pipe 8 for storage.

[0053] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A reaction kettle for sodium hypochlorite production, comprising a material preparation unit, a reaction kettle (7), a storage tank (13) and a temperature control unit, wherein the material preparation unit, the temperature control unit and the storage tank (13) are all connected to the reaction kettle (7), characterized in that: A first partition plate (702), a second partition plate (703), a third partition plate (713) and a plurality of reaction tubes (708) are arranged in the tank body (701) of the reaction kettle (7); the first partition plate (702), the second partition plate (703) and the third partition plate (713) are fixed in the tank body (701) in sequence, and the tank body (701) is divided into a liquid inlet chamber (710), a liquid outlet chamber (711), a temperature adjustment chamber (712) and a transmission chamber (715); the transmission chamber (715) is located between the first partition plate (702) and the second partition plate (703); the temperature adjustment chamber (712) is located between the second partition plate (703) and the third partition plate (713); the liquid inlet chamber (710) is located on one side of the first partition plate (702); the liquid outlet chamber (711) is located on one side of the third partition plate (713); The inner wall of the reaction tube (708) is fixedly provided with a spiral wing (709), and the reaction tube (708) passes through the first baffle (702), the second baffle (703) and the third baffle (713). The reaction tube (708) in the temperature adjustment chamber (712) is fixedly provided with a plurality of heat sinks (718). The reaction tube (708) in the transmission chamber (715) is provided with a gear ring (707), and the plurality of reaction tubes (708) are meshed and connected one by one through the gear ring (707). A driving gear (706) is also rotatably provided in the transmission chamber (715), and the driving gear (706) is meshed with one of the gear rings (707). A driving device (704) is provided on the top of the reaction kettle (7), and an output end of the driving device (704) is connected to the driving gear (706); The temperature control unit comprises a temperature control device (9), an inflow pipe (10), an outflow pipe (11) and a circulation pump (12); one end of the inflow pipe (10) and the outflow pipe (11) are both connected to the temperature control device (9), and the other ends are both connected to the temperature control chamber (712); and the circulation pump (12) is arranged on the inflow pipe (10); A discharge pipe (8) is fixedly provided on the storage tank (13), and a free end of the discharge pipe (8) is connected to the liquid discharge bin (711); A filter plate (714) is fixedly arranged in the liquid outlet bin (711), and a polymer film (717) is attached to the bottom of the filter plate (714); an air inlet pipe (14) is also arranged on the tank body (701), and the air inlet pipe (14) is connected to the liquid outlet bin (711), and the air inlet pipe (14) is located above the filter plate (714), and the discharge pipe (8) is located below the filter plate (714); A temperature sensor (716) is also provided in the temperature regulating chamber (712), and an output end of the temperature sensor (716) is electrically connected to the temperature regulating device (9) and the circulation pump (12).

2. A sodium hypochlorite production reactor according to claim 1, characterized in that: The material preparation unit comprises a water treatment device (2), a mixing tank (4) and a liquid supply pump (6); the water treatment device (2) is connected to the mixing tank (4) via a water outlet pipe (3); the mixing tank (4) is connected to the liquid inlet bin (710) via a liquid supply pipe (5); and the liquid supply pump (6) is installed on the liquid supply pipe (5).

3. A sodium hypochlorite production reactor according to claim 1, characterized in that: Sealing rings are provided at the connection points between the reaction tube (708) and the first partition plate (702), the second partition plate (703) and the third partition plate (713).

4. A sodium hypochlorite production reactor according to claim 1, characterized in that: The driving device (704) is connected to the driving gear (706) via a transmission rod (705).

5. A method for using a sodium hypochlorite production reactor according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1. In a mixing tank (4), sodium hydroxide is dissolved in water to prepare a sodium hydroxide solution, and the sodium hydroxide solution is transported to a liquid inlet bin (710) through a feed pump, so that the sodium hydroxide solution flows downward along the inner wall of a reaction tube (708) and a spiral wing (709), and at the same time, chlorine gas is introduced into a liquid outlet bin (711) through an air inlet pipe (14); S2, starting the temperature control device (9) and the circulation pump (12), and adjusting the temperature of the device to a temperature suitable for the reaction of the sodium hydroxide solution and the chlorine gas; S3, starting the driving device (704) to rotate the reaction tube (708), and using the spiral fins (709) to drive the internal chlorine gas to flow; S4. The reaction tubes (708) meshed with each other through the gear ring (707) rotate in opposite directions, and the gas inside flows in opposite directions, forming a circulating airflow between the liquid inlet bin (710) and the liquid outlet bin (711). The sodium hydroxide solution flowing through the reaction tube (708) reacts with the chlorine gas to generate a sodium hypochlorite solution, which drips from the bottom of the reaction tube (708) into the liquid outlet bin (711) and finally flows into the storage tank (13) through the discharge pipe (8).

6. The method for using a sodium hypochlorite production reactor according to claim 5, characterized in that: The sodium hypochlorite solution generated in step S4 passes through the filter plate (714) and the polymer membrane (717) in sequence before entering the liquid outlet bin (711) to filter and separate the by-products generated during the reaction.

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