Total phosphorus and total nitrogen low-temperature digestion device

Abstract

The total phosphorus and total nitrogen low-temperature digestion device comprises a reaction tank, an ultraviolet lamp assembly, a heating wire, a temperature sensor and a control end, the ultraviolet lamp assembly is arranged to be a strip-shaped object with external circuit ends at the upper part and the lower part; the reaction tank comprises a main body, an upper bent connecting pipe and a lower bent connecting pipe; the reaction tank main body is a closed annular cylinder formed by an inner cylinder and an outer cylinder, namely a reaction chamber; the inner cylinder is made of a light-transmitting material, the ultraviolet lamp assembly is inserted into the center of the annular cylinder of the reaction tank main body, and an ultraviolet lamp tube of the ultraviolet lamp assembly is located at the inner cylinder and clings to the inner cylinder; the upper bent connecting pipe and the lower bent connecting pipe are respectively communicated with the outer cylinder; the outer cylinder is made of a heat conduction material; the heating wire is wound on the periphery of the outer cylinder; the temperature sensor measures the temperature in real time and feeds back the temperature to the control end, and the control end controls the heating wire to heat. The device is small in size, simple in structure, convenient to maintain and suitable for most on-line monitoring occasions.

Description

Technical Field

[0001] The utility model relates to the field of water sample monitoring, in particular to a total phosphorus and total nitrogen low-temperature digestion device. Background Art

[0002] According to "GB11893-1989 Water Quality - Determination of Total Phosphorus - Ammonium Molybdate Spectrophotometry" and "HJ636-2012 Water Quality - Determination of Total Nitrogen - Alkaline Potassium Persulfate Digestion Ultraviolet Spectrophotometry", when testing the total phosphorus / total nitrogen content in water, in order to digest and convert all phosphorus / nitrogen-containing substances in the water sample into phosphate / nitrate, it is necessary to use a high temperature and high pressure device (the maximum working pressure is not less than 1.1-1.4 kg / cm2, and the maximum working temperature is not less than 120-124°C) for digestion.

[0003] However, high temperature and high pressure devices generally have some disadvantages: 1. High temperature and high pressure are dangerous. During the high temperature and high pressure digestion process, there may be hidden dangers of burns caused by touch or hot gas or liquid splashing when opening; 2. High cost. This technology requires the use of high pressure reactors and high temperature heating equipment, which has high equipment costs and maintenance costs; 3. High energy consumption. The power required to maintain high temperature and high pressure conditions is large, and the power consumption is high; 4. It is not suitable for analyzing high-salinity samples. High-salinity samples are prone to crystallization or precipitation under high temperature and high pressure conditions, affecting the accuracy of the measurement. To solve the above problems, the digestion temperature needs to be lowered, but lowering the digestion temperature will result in insufficient digestion rate of water samples, and accurate result values ​​cannot be detected.

[0004] The industry has tried to use ultraviolet light to promote oxidation and improve the digestion rate, but existing devices are often large in size, have complex parts and components, are difficult to assemble, and have limited application scenarios. Utility Model Content

[0005] The utility model aims to provide a low-temperature digestion device for total phosphorus and total nitrogen with reasonable structure and compact size.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a total phosphorus and total nitrogen low-temperature digestion device, including a reaction pool, an ultraviolet lamp assembly, a heating wire, a temperature sensor and a control terminal:

[0007] The ultraviolet lamp assembly is configured as a strip having upper and lower external circuit terminals, wherein the middle portion is provided with an ultraviolet lamp tube electrically connected to the upper and lower external circuit terminals;

[0008] The reaction pool includes a main body and an upper curved pipe and a lower curved pipe; the reaction pool main body is formed of an inner tube and an outer tube to form a closed annular cylinder, and the annular inner cavity of the annular cylinder is the reaction chamber; the inner tube of the annular cylinder is made of a light-transmitting material, the ultraviolet lamp assembly is inserted into the center of the annular cylinder, and the ultraviolet lamp tube is located in the inner tube and is tightly attached to the inner tube; the outer tube is connected to the upper and lower curved pipes respectively; the outer tube is made of a heat-conducting material, and the heating wire is wound around the outer periphery of the outer tube; a temperature sensor is provided on the outer tube of the reaction pool to measure the temperature of the outer tube in real time and feed it back to the control end, and the control end controls the heating of the heating wire.

[0009] Furthermore, the size of the ultraviolet lamp assembly corresponds to that of the inner tube, and the ultraviolet lamp assembly and the inner tube are transitionally matched.

[0010] Furthermore, an outer shell is provided, which includes a bottom shell and a sub-shell assembly, wherein a limiting groove is provided in the bottom shell, and the limiting groove corresponds to the shape of the reaction tank and the ultraviolet lamp assembly after being combined; the sub-shell assembly is divided into a main body sub-shell, an upper terminal shell and a lower terminal shell; the side walls at both ends of the main body sub-shell are respectively provided with an upper window and a lower window, which respectively correspond to the upper bent pipe and the lower bent pipe of the reaction tank; the reaction tank and the ultraviolet lamp assembly are placed in the limiting groove after being combined, and further, the main body sub-shell is snapped in and fixedly locked with the bottom shell, the upper bent pipe extends from the upper window, and the lower bent pipe extends from the lower window.

[0011] Furthermore, the limiting grooves of the bottom shell are located at the upper and lower external circuit ends of the ultraviolet lamp assembly, and are respectively provided with upper and lower wiring holes.

[0012] Furthermore, the sub-shell components are respectively provided with structures for locking with the bottom shell.

[0013] Furthermore, when the split shell assembly is locked with the bottom shell, the main split shell partially covers the upper terminal shell and the lower terminal shell, and the overall sealing effect is better.

[0014] The patented structure is reasonably designed. A UV lamp assembly is used to directly penetrate the reaction pool and irradiate the electrolyte in the reaction pool with UV light, so that the UV irradiation coverage is large and the UV light efficiency is high. When the water sample is heated to 70°C under the irradiation condition of the UV lamp, all phosphorus / nitrogen-containing substances can be completely digested and converted into phosphates / nitrates.

[0015] At the same time, the present patent utilizes the downward curved pipe to input air to stir the electrolyte in the reaction tank, thereby ensuring the uniformity of the electrolyte and saving space for the stirring device. That is, the design of the downward curved pipe can be used to input water samples and digestion solutions, as well as to input air for stirring, so that one pipe can be used for multiple purposes.

[0016] At the same time, the reasonable shell design makes this total phosphorus and total nitrogen low-temperature digestion device an integrated, modular structure. It only needs to lock the whole device at the place of use and connect the lines to realize the digestion process according to the established program. It is convenient and compact.

[0017] Further advantages include: ① The reaction pool is small in size, with a volume of only 5 ml, and less waste liquid is generated after the reaction, which is suitable for online monitoring. ② The aeration mixing method is adopted, and no additional stirring device is required, and the structure is more streamlined. ③ Since the amount of water sample to be digested is small, only one UV lamp can be used to achieve the purpose of complete digestion, saving costs and energy consumption. ④ The inlet and outlet samples use a unified port, reducing the use of pumps, valves, and pipelines, which is more suitable for online monitoring equipment. ⑤ The structure is simple and easy to maintain. Damaged parts can be directly disassembled and replaced, and the reaction pool can also be directly disassembled and cleaned. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an exploded schematic diagram of an embodiment of the utility model;

[0019] Figure 2 Schematic diagram of the decomposition of the embodiment of the utility model Figure 1 ;

[0020] Figure 3 Schematic diagram of the decomposition of the embodiment of the utility model Figure 2 ;

[0021] Figure 4 It is a cross-sectional schematic diagram of an embodiment of the utility model;

[0022] Figure 5 It is a schematic diagram of the assembly of an embodiment of the utility model.

[0023] Attached photos

[0024] 1. Reaction pool; 12. Main body; 121. Upper bend pipe; 122. Lower bend pipe; 123. Inner tube; 124. Outer tube; 125. Annular inner chamber; 2. UV lamp assembly; 21. External circuit terminal; 22. UV lamp tube; 3. Heating wire; 4. Temperature sensor; 6. Outer shell; 61. Bottom shell; 611. Limiting groove; 6111. Upper wiring hole; 6112. Lower wiring hole; 62. Sub-shell assembly; 621. Main body sub-shell; 6211. Upper window; 6212. Lower window; 622. Upper terminal shell; 623. Lower terminal shell; 624. Groove. DETAILED DESCRIPTION

[0025] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but cannot be understood as limiting the present invention. Example

[0026] like Figure 1-5 As shown, a total phosphorus and total nitrogen low-temperature digestion device includes a reaction pool 1, an ultraviolet lamp assembly 2, a heating wire 3, a temperature sensor 4 and a control terminal (not shown in the figure);

[0027] The ultraviolet lamp assembly 2 is configured as a strip having upper and lower external circuit terminals 21, wherein the middle portion of the strip is provided with an ultraviolet lamp tube 22 electrically connected to the upper and lower external circuit terminals 21;

[0028] like Figure 1 As shown, the reaction pool 1 includes a main body 12 and an upper curved pipe 121 and a lower curved pipe 122; the main body 12 of the reaction pool 1 is an annular cylinder, which is formed by an inner cylinder 123 and an outer cylinder 124 to form a closed annular cylinder, and an annular inner chamber 125 is formed inside the annular cylinder, which is the reaction pool 1 chamber for the digestion reaction of the digestion liquid, and the inner cylinder 123 is made of a light-transmitting material. The ultraviolet lamp assembly 2 is inserted into the center of the annular cylinder of the main body 12 of the reaction pool 1. The size of the ultraviolet lamp assembly 2 corresponds to that of the inner cylinder 123, and the ultraviolet lamp assembly 2 and the inner cylinder 123 are transitionally matched, and the position of the ultraviolet lamp tube 22 is located at the inner cylinder 123. And it is closely attached to the inner cylinder 123. When in the digestion state, the light of the ultraviolet lamp 22 can pass through the inner cylinder 123 to perform light digestion on the water sample in the annular cylinder; the outer cylinder 124 is provided with conductive bent pipes towards the top and bottom, respectively, which are the upper bent pipe 121 and the lower bent pipe 122; the outer cylinder 124 is made of heat-conducting material, and the heating wire 3 is wound around the periphery of the reaction pool 1; a temperature sensor 4 is provided on the outer cylinder 124 of the reaction pool 1, which measures the temperature of the outer cylinder 124 in real time (because the outer cylinder 124 is made of heat-conducting material, it can represent the temperature in the reaction pool) and feeds back to the control end, and the control end controls the heating wire 3 to heat.

[0029] A shell 6 is also provided, the shell 6 includes a bottom shell 61 and a sub-shell assembly 62, wherein a limiting groove 611 is provided in the bottom shell 61, and the limiting groove 611 corresponds to the shape of the reaction pool 1 and the ultraviolet lamp assembly 2 after combination; the sub-shell assembly 62 is divided into a main body sub-shell 621, an upper terminal shell 622 and a lower terminal shell 623, and the main body sub-shell 621, the upper terminal shell 622 and the lower terminal shell 623 are respectively provided with corresponding grooves 624 corresponding to the shape of the reaction pool 1 and the ultraviolet lamp assembly 2 after combination, such as Figure 3The groove 624 in the bottom shell 624; the side walls at both ends of the main body shell 621 are respectively provided with an upper window 6211 and a lower window 6212, which correspond to the upper curved pipe 121 and the lower curved pipe 122 of the reaction tank 1 respectively; the reaction tank 1 and the ultraviolet lamp assembly 2 are combined and placed in the limiting groove 611, and further, the main body shell 621 is snapped in and fixedly locked with the bottom shell 61, the upper curved pipe 121 extends out from the upper window 6211, and the lower curved pipe 122 extends out from the lower window 6212, so as to facilitate further external connection with other facilities and realize the input of water samples, digestion liquid, air, etc., as well as the processes of drainage.

[0030] like Figure 5 As shown, the main body sub-shell 621 partially covers the upper terminal shell 622 and the lower terminal shell 623, so that when the sub-shell assembly 62 and the bottom shell 61 are locked, the overall sealing effect is better; the sub-shell assembly 62 is designed to be block-type, which is convenient for assembly and disassembly.

[0031] The limiting groove 611 of the bottom shell 61 is located at the upper and lower external circuit ends 21 of the ultraviolet lamp assembly 2, and is respectively provided with upper and lower wiring holes 6112. In actual application, the external power line passes through the upper and lower wiring holes 6112 and is respectively connected to the upper and lower external circuit ends 21 of the ultraviolet lamp assembly 2; at the same time, it is generally designed that the upper wiring hole 6111 passes through another circuit line to be electrically connected to the temperature sensor 4; the lower wiring hole 6112 passes through a circuit line to be electrically connected to the heating wire 3.

[0032] The split shell components 62 are respectively provided with structures for locking with the bottom shell 61. As shown in the figure, a plurality of locking holes are correspondingly arranged between the split shell components 62 and the bottom shell 61. When in use, it is only necessary to lock the corresponding locking holes respectively.

[0033] In actual use, the mixed liquid of the water sample and the digestion solution is pushed into the lower curved pipe 122, and then pushed into the annular cylindrical reaction tank 1. At the same time, an appropriate amount of air is input into the lower curved pipe 122 through an air machine (such as a blower), so that the water sample and the digestion solution are evenly mixed in the annular cylindrical reaction tank 1, and the ultraviolet lamp 22 is turned on to irradiate the water sample to promote the oxidation of the water sample. At the same time, the heating wire 3 heats the mixed liquid through the outer tube 124 to heat the mixed liquid therein, and the temperature sensor 4 reads and assists the control end to control the temperature to be kept within the preset temperature of 70°C, thereby achieving complete digestion of phosphorus / nitrogen-containing substances in the water sample under low temperature conditions, and achieving the purpose of accurately detecting total phosphorus / total nitrogen; after the digestion is completed, it is only necessary to switch the external connection device, and the waste liquid is still discharged to the outside through the lower curved pipe 122;

[0034] The upper curved pipe 121 of the reaction tank 1 is connected to the atmosphere, and the lower curved pipe 122 is both an inlet and an outlet. The interface is connected to an external power device. The pump valve first pushes the water sample and the digestion solution into the reaction tank 1 from the lower interface, and then blows air from the lower interface to fully mix the water sample and the digestion solution. The advantage of the reaction tank 1 being designed in this way is that a certain degree of mixing effect can be achieved when the water sample and the digestion solution enter the reaction tank 1 from the lower interface respectively, and then blows air from the bottom to fully mix them by air stirring. When the water sample is digested, extracting the water sample from the lower interface can achieve the effect of completely extracting the water sample.

[0035] In this patent, the reaction pool 1 and the ultraviolet lamp are independent of each other, and the design of the annular reaction pool 1 fully covering the internal ultraviolet lamp tube 22 is adopted to ensure that the water sample is evenly irradiated by ultraviolet light in the reaction pool 1. In addition, the ultraviolet lamp tube 22 is located inside, which can not only avoid the harm caused by direct ultraviolet light to the human body by covering the outermost part of the reaction pool 1 with light-shielding materials, but also facilitate the heating wire 3 to be wrapped around the outside of the reaction pool 1. The heating method adopts the method of the heating wire 3 surrounding the reaction pool 1 to ensure that the water sample is evenly heated in the reaction pool 1.

[0036] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A total phosphorus and total nitrogen low-temperature digestion device, comprising a reaction pool, an ultraviolet lamp assembly, a heating wire, a temperature sensor and a control terminal, characterized in that: The ultraviolet lamp assembly is configured as a strip having upper and lower external circuit terminals, wherein the middle portion is provided with an ultraviolet lamp tube electrically connected to the upper and lower external circuit terminals; The reaction pool includes a main body and an upper curved pipe and a lower curved pipe; the reaction pool main body is formed of an inner tube and an outer tube to form a closed annular cylinder, and the annular inner cavity of the annular cylinder is the reaction chamber; the inner tube of the annular cylinder is made of a light-transmitting material, the ultraviolet lamp assembly is inserted into the center of the annular cylinder, and the ultraviolet lamp tube is located in the inner tube and is tightly attached to the inner tube; the outer tube is connected to the upper and lower curved pipes respectively; the outer tube is made of a heat-conducting material, and the heating wire is wound around the outer periphery of the outer tube; a temperature sensor is provided on the outer tube of the reaction pool to measure the temperature of the outer tube in real time and feed it back to the control end, and the control end controls the heating of the heating wire.

2. A total phosphorus and total nitrogen low temperature digestion device as claimed in claim 1, characterized in that: The size of the ultraviolet lamp assembly corresponds to that of the inner cylinder, and the ultraviolet lamp assembly and the inner cylinder are transitionally matched.

3. A total phosphorus and total nitrogen low temperature digestion device as claimed in claim 1, characterized in that: A shell is also provided, which includes a bottom shell and a sub-shell assembly, wherein a limiting groove is provided in the bottom shell, and the limiting groove corresponds to the shape of the reaction pool and the ultraviolet lamp assembly after being combined; the sub-shell assembly is divided into a main body sub-shell, an upper terminal shell and a lower terminal shell; the side walls at both ends of the main body sub-shell are respectively provided with an upper window and a lower window, which respectively correspond to the upper bent pipe and the lower bent pipe of the reaction pool; the reaction pool and the ultraviolet lamp assembly are placed in the limiting groove after being combined, and further, the main body sub-shell is snapped in and fixedly locked with the bottom shell, the upper bent pipe extends out from the upper window, and the lower bent pipe extends out from the lower window.

4. A total phosphorus and total nitrogen low temperature digestion device as claimed in claim 3, characterized in that: The limiting grooves of the bottom shell are located at the upper and lower external circuit ends of the ultraviolet lamp assembly, and are respectively provided with upper and lower wiring holes.

5. A total phosphorus and total nitrogen low temperature digestion device as claimed in claim 3, characterized in that: The sub-shell components are respectively provided with structures for locking with the bottom shell.

6. A total phosphorus and total nitrogen low temperature digestion device as claimed in claim 3, characterized in that: When the split shell assembly is locked with the bottom shell, the main split shell partially covers the upper terminal shell and the lower terminal shell, and the overall sealing effect is better.

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