Chlorine dioxide generation system and wastewater treatment system

Abstract

The utility model belongs to the technical field of wastewater treatment, and relates to a chlorine dioxide generation system and a wastewater treatment system. The chlorine dioxide generating system comprises a control box, a pretreatment stirring tank for uniformly mixing raw materials and a reaction kettle for generating chlorine dioxide, according to the utility model, concentrated sulfuric acid, hydrogen peroxide and sodium chlorate are used as raw materials for reaction, the reaction equation is as follows: chlorine dioxide gas with the purity of more than 95% is generated under the catalysis of a catalyst at a specific temperature, the conversion rate is high, byproducts are few, and the safety of personnel and equipment can be effectively ensured by arranging a pressure gauge on the reaction kettle.

Description

Technical Field

[0001] The utility model belongs to the technical field of wastewater treatment and relates to a chlorine dioxide generation system and a wastewater treatment system. Background Art

[0002] Chlorine dioxide is a gas that appears yellow-green to orange-yellow and has a strong and pungent odor. In the field of sewage treatment, chlorine dioxide can be used for disinfection, oxidation, decolorization, algaecide and deodorization. Its disinfection has significant advantages such as excellent bactericidal effect, rapid action, low dosage and no influence from pH value. Commonly used methods for preparing chlorine dioxide include oxidation, acidification, persulfate oxidation and electrolysis. However, chlorine dioxide is extremely irritating and can cause pulmonary edema, severe damage to the respiratory tract, and even death when exposed to high concentrations. Existing chlorine dioxide generating devices have defects such as poor purity, easy leakage, low reaction conversion rate, and numerous by-products.

[0003] In view of this, the present utility model is proposed. Utility Model Content

[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a chlorine dioxide generation system and a wastewater treatment system, which can generate chlorine dioxide with a purity of more than 95%, is not prone to leakage, and has a high conversion rate.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] The chlorine dioxide generation system includes: a control box, a pretreatment stirring tank for uniformly mixing raw materials, and a reaction kettle for generating chlorine dioxide;

[0007] The pretreatment stirring tank includes an independent upper stirring tank and a lower stirring tank, and the upper stirring tank and the lower stirring tank share a first stirring mechanism; the upper stirring tank is respectively provided with a hydrogen peroxide feed port, an upper water inlet, and a sodium chlorate feed port, and the lower stirring tank is respectively provided with a concentrated sulfuric acid feed port and a lower water inlet; the raw materials uniformly mixed in the pretreatment stirring tank are transported to the reactor through a conveying pipeline, and a diaphragm metering dosing pump is installed on the conveying pipeline; the first stirring mechanism and the diaphragm metering dosing pump are respectively connected to a controller in a control box;

[0008] The reactor is equipped with a second stirring mechanism and a temperature control mechanism for monitoring the temperature in the reactor. The top of the reactor is provided with a pressure gauge and a chlorine dioxide outlet, and the bottom is provided with a drain port. The second stirring mechanism and the temperature control mechanism are respectively connected to the controller in the control box.

[0009] Furthermore, the temperature control mechanism includes a heating tube spirally wound around the inner wall of the reactor, and a temperature probe installed on the inner wall of the reactor, and the temperature probe is connected to the controller in the control box; hot circulating water flows through the heating tube to heat the raw materials in the reactor.

[0010] Furthermore, the side walls of the reactor are respectively provided with a hot circulating water inlet and a hot circulating water outlet. The hot circulating water in the water collecting tank enters the heating pipe through the hot circulating water inlet via a water pump to heat the raw materials in the reactor, and then flows out from the hot circulating water outlet.

[0011] Preferably, the temperature of the hot circulating water is 68°C to 72°C.

[0012] Furthermore, the first stirring mechanism includes a first stirring shaft, a first stirring motor that drives the first stirring shaft to rotate, and stirring blades distributed on the first stirring shaft; the first stirring motor is connected to the controller in the control box, and the output shaft of the first stirring motor is connected to the first stirring shaft through a coupling.

[0013] Furthermore, the second stirring mechanism includes a second stirring shaft, a second stirring motor that drives the second stirring shaft to rotate, and stirring blades distributed on the second stirring shaft; the second stirring motor is connected to the controller in the control box, and the output shaft of the second stirring motor is connected to the second stirring shaft through a coupling.

[0014] Furthermore, the purity of the chlorine dioxide discharged from the chlorine dioxide outlet is ≥95%.

[0015] Furthermore, a safety pressure relief valve is installed on the delivery pipeline.

[0016] In addition, the present invention also provides a wastewater treatment system of the chlorine dioxide generation system as described above in part or in whole, and also includes a residual chlorine monitoring system, which includes a residual chlorine measuring and controlling instrument and a residual chlorine sensor connected to each other.

[0017] Furthermore, the wastewater treatment system also includes a chlorine dioxide leakage alarm, which is connected to a controller in the control box. When the chlorine dioxide leakage alarm activates the alarm mechanism, the controller cuts off the raw material supply by shutting off the diaphragm metering dosing pump.

[0018] Compared with the existing technology, the technical solution provided by the utility model has the following beneficial effects:

[0019] 1) The pretreatment stirring tank is divided into an upper stirring tank and a lower stirring tank. The upper stirring tank is used to prepare sodium chlorate and hydrogen peroxide. Sodium chlorate is poured in from the top of the upper stirring tank, and hydrogen peroxide and pure water are input by a pump through a pipeline. During preparation, pure water and hydrogen peroxide are first added to the upper stirring tank, and then sodium chlorate is poured in after adding them. The lower stirring tank dilutes concentrated sulfuric acid. Pure water is first added, and then concentrated sulfuric acid is input by a pump through a pipeline. The upper stirring tank and the lower stirring tank share a first stirring mechanism. During preparation, starting the first stirring mechanism can achieve rapid mixing of the raw materials.

[0020] 2) The reactor is where the raw materials mix and react to produce chlorine dioxide. The reactor is constructed of stainless steel to prevent corrosion and perforation, which could lead to chlorine leaks. A pressure gauge is installed in the reactor to prevent potential safety hazards caused by excessive pressure. Raw materials pretreated in the pretreatment mixing tank are then fed into the reactor via a diaphragm metering pump for reaction. The reactor is equipped with a secondary stirring mechanism to quickly and thoroughly mix the two raw materials. A heating tube is installed within the reactor to maintain a suitable reaction temperature. A drain port is located at the bottom of the reactor to remove any residual liquid.

[0021] 3) The chlorine dioxide generation system uses concentrated sulfuric acid, hydrogen peroxide, and sodium chlorate as raw materials, and the reaction equation is: Under specific temperature and catalyst catalysis, chlorine dioxide gas with a purity of over 95% is generated with high conversion rate and few by-products. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are incorporated into and constitute a part of this specification and, together with the description, are used to explain the principles of the present invention.

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0024] Figure 1 This is a structural diagram of a chlorine dioxide generation system provided by the utility model.

[0025] Explanation of the accompanying symbols: 1. Pretreatment stirring tank; 1-1. Upper stirring tank; 1-1-1. Hydrogen peroxide feed port; 1-1-2. Upper water inlet; 1-1-3. Sodium chlorate feed port; 1-2. Lower stirring tank; 1-2-1. Concentrated sulfuric acid feed port; 1-2-2. Lower water inlet; 1-3. First stirring mechanism; 2. Reactor; 2-1. Second stirring mechanism; 2-2. Pressure gauge; 2-3. Chlorine dioxide outlet; 2-4. Drain port; 2-5. Heating tube; 2-6. Temperature probe; 2-7. Hot circulating water inlet; 2-8. Hot circulating water outlet; 3. Safety valve; 4. Diaphragm metering and dosing pump. DETAILED DESCRIPTION

[0026] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible implementations consistent with the present invention. Instead, they are merely examples consistent with certain aspects of the present invention as detailed in the appended claims.

[0027] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0028] Example

[0029] See also Figure 1 As shown, this embodiment provides a chlorine dioxide generation system, comprising: a control box, a pretreatment stirring tank 1 for uniformly mixing raw materials, and a reaction kettle 2 for generating chlorine dioxide;

[0030] The pretreatment stirring tank 1 includes an independent upper stirring tank 1-1 and a lower stirring tank 1-2, and the upper stirring tank 1-1 and the lower stirring tank 1-2 share a first stirring mechanism 1-3; the upper stirring tank 1-1 is respectively provided with a hydrogen peroxide feed port 1-1-1, an upper water inlet 1-1-2, and a sodium chlorate feed port 1-1-3, and the lower stirring tank 1-2 is respectively provided with a concentrated sulfuric acid feed port 1-2-1 and a lower water inlet 1-2-2; the raw materials uniformly mixed in the pretreatment stirring tank 1 are transported to the reactor 2 through a conveying pipe, and a diaphragm metering dosing pump 4 is installed on the conveying pipe; the first stirring mechanism 1-3 and the diaphragm metering dosing pump 4 are respectively connected to the controller in the control box;

[0031] The reactor 2 is equipped with a second stirring mechanism 2-1 and a temperature control mechanism for monitoring the temperature in the reactor 2. A pressure gauge 2-2 and a chlorine dioxide outlet 2-3 are provided on the top of the reactor 2, and a drain port 2-4 is provided on the bottom. The second stirring mechanism 2-1 and the temperature control mechanism are respectively connected to the controller in the control box.

[0032] Preferably, the body of the reactor 2 is made of stainless steel to prevent corrosion and perforation of the equipment, which may cause chlorine leakage.

[0033] Preferably, the temperature control mechanism includes a heating tube 2-5 spirally wound around the inner wall of the reactor 2, and a temperature probe 2-6 mounted on the inner wall of the reactor 2. The temperature probe 2-6 is connected to a controller in a control box. Hot circulating water flows through the heating tube 2-5 to heat the raw materials in the reactor 2. It should be noted that the temperature control mechanism has temperature control and automatic adjustment functions. By providing the heating tube 2-5 and the temperature probe 2-6 on the inner wall of the reactor 2, the temperature probe 2-6 feeds back a temperature signal to the controller. The controller issues a switching command to the hot circulating water supply device based on the received temperature signal, thereby controlling the reaction temperature of the reactor 2 to maintain a constant. In this embodiment, the temperature is required to be controlled at 68°C to 72°C to ensure a conversion rate of over 95%.

[0034] Furthermore, the side walls of the reactor 2 are respectively provided with a hot circulating water inlet 2-7 and a hot circulating water outlet 2-8. The hot circulating water in the water collecting tank enters the heating pipe 2-5 through the hot circulating water inlet 2-7 via a water pump to heat the raw materials in the reactor 2, and then flows out through the hot circulating water outlet 2-8.

[0035] Specifically, the first stirring mechanism 1-3 includes a first stirring shaft, a first stirring motor that drives the first stirring shaft to rotate, and stirring blades distributed on the first stirring shaft; the first stirring motor is connected to the controller in the control box, and the output shaft of the first stirring motor is connected to the first stirring shaft through a coupling.

[0036] Similarly, the second stirring mechanism 2-1 includes a second stirring shaft, a second stirring motor that drives the second stirring shaft to rotate, and stirring blades distributed on the second stirring shaft; the second stirring motor is connected to the controller in the control box, and the output shaft of the second stirring motor is connected to the second stirring shaft through a coupling.

[0037] Specifically, the purity of the chlorine dioxide discharged from the chlorine dioxide outlet 2-3 is ≥95%.

[0038] Preferably, a safety valve 3 is also installed on the delivery pipeline.

[0039] The working process of the above chlorine dioxide generation system is as follows:

[0040] First, the pretreatment stirring tank 1 stirs and mixes the raw materials: the pretreatment stirring tank 1 is divided into an upper stirring tank 1-1 and a lower stirring tank 1-2. The upper stirring tank 1-1 is used to prepare sodium chlorate and hydrogen peroxide. Sodium chlorate is poured from the top of the upper stirring tank 1-1, and hydrogen peroxide and pure water are input by a pump through a pipeline. During preparation, pure water and hydrogen peroxide are first added to the upper stirring tank 1-1, and then sodium chlorate is poured in after adding; the lower tank dilutes concentrated sulfuric acid, first adding pure water, and then inputting concentrated sulfuric acid by a pump through a pipeline. The upper stirring tank 1-1 and the lower stirring tank 1-2 share a first stirring mechanism 1-3. During preparation, the controller first starts the first stirring mechanism 1-3 to achieve rapid mixing of the raw materials.

[0041] Then, the controller starts the diaphragm metering dosing pump 4 (which can accurately provide raw materials) to transport the raw materials evenly mixed in the pretreatment stirring tank 1 to the reactor 2 through the delivery pipeline;

[0042] Finally, the controller starts the reactor 2 to start working. The reactor 2 is where the raw materials are mixed and reacted to produce chlorine dioxide. The reactor 2 is equipped with a pressure gauge 2-2 to prevent excessive pressure and avoid safety hazards. The raw materials in the reactor 2 can be quickly and fully mixed under the action of the second stirring mechanism 2-1. At the reaction temperature of 68°C to 72°C provided by the heating tube 2-5, the reaction equation is: The generated chlorine dioxide gas has a purity of more than 95%, a high conversion rate and few by-products. After the reaction is completed, the bottom of the reactor 2 is provided with a drain port 2-4 to discharge the residual liquid.

[0043] In addition, this embodiment also provides a wastewater treatment system of the chlorine dioxide generation system as described above in part or in whole, and also includes a residual chlorine monitoring system. The residual chlorine monitoring system includes a residual chlorine measuring and controlling instrument and a residual chlorine sensor that are interconnected. The residual chlorine sensor transmits a monitoring signal to control the appropriate residual chlorine in the terminal water body to prevent pipeline corrosion due to low residual chlorine and low disinfection effect, and excessive residual chlorine.

[0044] Furthermore, the wastewater treatment system also includes a chlorine dioxide leak alarm, which is connected to the controller in the control box. If a chlorine dioxide gas leak occurs in the workroom, the chlorine dioxide leak alarm triggers an alarm mechanism, and the controller shuts off the diaphragm metering dosing pump 4 to cut off the raw material supply and stop the production of chlorine dioxide gas to ensure the safety of personnel and equipment. In addition, the reactor 2 itself is also equipped with a pressure gauge 2-2, which can highly ensure the safety of personnel and equipment.

[0045] The above description is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention.

[0046] It should be understood that the present invention is not limited to the above description and that various modifications and changes can be made without departing from the scope of the present invention. The scope of the present invention is limited only by the appended claims.

Claims

1. A chlorine dioxide generating system, characterized in that: include: A control box, a pretreatment stirring tank (1) for uniformly mixing raw materials, and a reaction kettle (2) for generating chlorine dioxide; The pretreatment stirring tank (1) comprises an upper stirring tank (1-1) and a lower stirring tank (1-2) which are independent of each other, and the upper stirring tank (1-1) and the lower stirring tank (1-2) share a first stirring mechanism (1-3); the upper stirring tank (1-1) is respectively provided with a hydrogen peroxide feed port (1-1-1), an upper water inlet (1-1-2), and a sodium chlorate feed port (1-1-3); the lower stirring tank (1-2) is respectively provided with a concentrated sulfuric acid feed port (1-2-1) and a lower water inlet (1-2-2); the raw materials uniformly mixed in the pretreatment stirring tank (1) are transported to the reactor (2) through a transport pipeline, and a diaphragm metering dosing pump (4) is installed on the transport pipeline; the first stirring mechanism (1-3) and the diaphragm metering dosing pump (4) are respectively connected to a controller in a control box; The reactor (2) is equipped with a second stirring mechanism (2-1) and a temperature control mechanism for monitoring the temperature in the reactor (2); a pressure gauge (2-2) and a chlorine dioxide outlet (2-3) are provided on the top of the reactor (2), and a liquid discharge port (2-4) is provided on the bottom; the second stirring mechanism (2-1) and the temperature control mechanism are respectively connected to a controller in a control box.

2. The chlorine dioxide generating system according to claim 1, characterized in that: The temperature control mechanism comprises a heating tube (2-5) spirally wound around the inner wall of the reactor (2), and a temperature probe (2-6) installed on the inner wall of the reactor (2), wherein the temperature probe (2-6) is connected to a controller in a control box; hot circulating water flows through the heating tube (2-5) to heat the raw materials in the reactor (2).

3. The chlorine dioxide generating system according to claim 2, characterized in that: The side walls of the reactor (2) are respectively provided with a hot circulating water inlet (2-7) and a hot circulating water outlet (2-8). The hot circulating water in the water collecting tank enters the heating pipe (2-5) through the hot circulating water inlet (2-7) via a water pump to heat the raw materials in the reactor (2), and then flows out through the hot circulating water outlet (2-8).

4. The chlorine dioxide generating system according to claim 3, characterized in that: The temperature of the hot circulating water is 68°C to 72°C.

5. The chlorine dioxide generating system according to claim 1, characterized in that: The first stirring mechanism (1-3) includes a first stirring shaft, a first stirring motor that drives the first stirring shaft to rotate, and stirring blades distributed on the first stirring shaft; the first stirring motor is connected to the controller in the control box, and the output shaft of the first stirring motor is connected to the first stirring shaft through a coupling.

6. The chlorine dioxide generating system according to claim 1, characterized in that: The second stirring mechanism (2-1) includes a second stirring shaft, a second stirring motor that drives the second stirring shaft to rotate, and stirring blades distributed on the second stirring shaft; the second stirring motor is connected to the controller in the control box, and the output shaft of the second stirring motor is connected to the second stirring shaft through a coupling.

7. The chlorine dioxide generating system according to claim 1, characterized in that: The purity of the chlorine dioxide discharged from the chlorine dioxide outlet (2-3) is ≥95%.

8. The chlorine dioxide generating system according to claim 1, characterized in that: A safety valve (3) is also installed on the delivery pipeline.

9. A wastewater treatment system, characterized in that: The chlorine dioxide generating system comprises the chlorine dioxide generating system as described in any one of claims 1 to 8 above, and also comprises a residual chlorine monitoring system, wherein the residual chlorine monitoring system comprises a residual chlorine measuring and controlling instrument and a residual chlorine sensor connected to each other.

10. The wastewater treatment system according to claim 9, characterized in that: It also includes a chlorine dioxide leakage alarm, which is connected to a controller in the control box. When the chlorine dioxide leakage alarm activates the alarm mechanism, the controller cuts off the raw material supply by shutting off the diaphragm metering dosing pump (4).

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