A pre-treatment SCR pickling tank heating device

Abstract

The invention provides a pre-treatment SCR pickling tank heating device, including a liquid storage tank, a heating tube, and a pickling tank connected in sequence, wherein the heating tube is filled with a filling layer, and a liquid inlet cavity for the pickling liquid to flow through is opened in the filling layer, and a heating wire is arranged in the liquid inlet cavity, and the liquid inlet end of the liquid inlet cavity is connected to the liquid inlet at the top of the heating tube, and the liquid outlet end of the liquid inlet cavity is connected to the liquid outlet at the bottom of the heating tube, and the liquid outlet is connected to the circulating acid inlet pipe, and the circulating liquid inlet of the circulating acid inlet pipe is located above the cover plate, and the cover plate is located at the bottom of the pickling tank, and a guide groove is opened downward on the top of the cover plate. The pre-treatment SCR pickling tank heating device created by the invention can solve the bottleneck of long single corrosion time and limited production capacity, increase the heating device, increase the temperature of hydrofluoric acid, significantly improve its corrosion ability, reduce the process corrosion time, and increase the equipment production capacity.

Description

Technical Field

[0001] The invention belongs to the field of pickling equipment, and in particular relates to a pre-treatment SCR pickling tank heating device. Background Art

[0002] The main raw material for optical fiber production is optical fiber preform. The pretreatment process is mainly responsible for the early processing of the preform, including: measuring, cutting, welding, pulling, cleaning and other work; among them, cleaning is to place the preform in the pickling equipment and immerse it in hydrofluoric acid, nitric acid and other chemicals for a certain period of time to achieve the purpose of cleaning; the concentration of hydrofluoric acid, nitric acid and other chemicals determines its corrosion intensity and corrosion time, so as to meet the production requirements of the pickling process.

[0003] The existing pre-treatment SCR pickling tank usually uses hydrofluoric acid at room temperature for pickling, but the corrosion capacity of hydrofluoric acid at room temperature is limited, so the corrosion time of the existing equipment process is very long and the equipment production capacity is low. Summary of the invention

[0004] In view of this, the invention aims to propose a pretreatment SCR pickling tank heating device to solve the bottleneck of long single corrosion time and limited production capacity. A heating device is added, the temperature of hydrofluoric acid is increased, its corrosion ability is significantly improved, the process corrosion time is reduced, and the equipment production capacity is increased.

[0005] To achieve the above object, the technical solution created by the present invention is implemented as follows:

[0006] A pretreatment SCR pickling tank heating device comprises a liquid storage tank, a heating pipe and a pickling tank which are connected in sequence, wherein the heating pipe is filled with a filling layer, a liquid inlet cavity for the pickling liquid to flow through is opened in the filling layer, a heating wire is arranged in the liquid inlet cavity, a liquid inlet end of the liquid inlet cavity is connected with a liquid inlet port at the top of the heating pipe, a liquid outlet end of the liquid inlet cavity is connected with a liquid outlet port at the bottom of the heating pipe, the liquid outlet port is connected with a circulating acid inlet pipe, a circulating liquid inlet port of the circulating acid inlet pipe is located above a cover plate, the cover plate is located at the bottom of the pickling tank, and a guide groove is opened downwardly from the top of the cover plate.

[0007] Furthermore, a liquid inlet groove is opened downward at the top center of the cover plate, and at least four guide grooves are provided. The four guide grooves are located around the liquid inlet groove, and one end of the guide groove is connected to the liquid inlet groove.

[0008] Furthermore, the guide groove is inclined from the liquid inlet groove toward the bottom of the cover plate.

[0009] Furthermore, four corner brackets are provided at the bottom of the pickling tank, and the cover plate is fixed on the top of the four corner brackets.

[0010] Furthermore, it also includes a circulating acid return pipe, one end of which extends into the lower part of the pickling tank, and the other end of which is connected to the acid return collection tank after passing through the acid return pneumatic diaphragm pump.

[0011] Furthermore, a liquid inlet pneumatic diaphragm pump is provided between the liquid outlet and the circulating liquid inlet.

[0012] Furthermore, the liquid inlet cavity is a wave-shaped cavity that cooperates with the heating wire.

[0013] Furthermore, the heating wire is a hydrofluoric acid-resistant heating wire, the heating wire is electrically connected to the controller, and the outer wall of the heating wire is sheathed with an acid-resistant PFA tube.

[0014] Furthermore, the filling layers are, from outside to inside, a thermal insulation layer, a pressure-resistant layer, and a corrosion-resistant layer.

[0015] Furthermore, the thermal insulation layer is made of rubber-plastic thermal insulation material, the pressure-resistant layer is made of polyethylene material with a molecular weight of 200,000-500,000, and the corrosion-resistant layer is made of polytetrafluoroethylene material.

[0016] Furthermore, the circulating acid inlet pipe and the circulating acid return pipe are both made of high-purity imported PP polypropylene material pipes.

[0017] Furthermore, the cover plate is a PP polypropylene cover plate, which is used to guide the circulating hot acid.

[0018] Furthermore, an acid-resistant pneumatic diaphragm pump is used to pump in and out the acid.

[0019] Furthermore, a leakage sensor alarm is provided at the pump to monitor in real time whether leakage occurs.

[0020] Compared with the prior art, the pretreatment SCR pickling tank heating device created by the present invention has the following advantages:

[0021] (1) The pretreatment SCR pickling tank heating equipment created by the present invention can solve the bottleneck of long single corrosion time and limited production capacity. It adds a heating device, increases the temperature of hydrofluoric acid, significantly improves its corrosion ability, reduces the process corrosion time, and increases the equipment production capacity.

[0022] (2) The pretreatment SCR pickling tank heating device created by the present invention is provided with a wavy liquid inlet cavity, which increases the contact area between the pickling liquid and the heating wire, improves the heating effect, and reduces energy consumption.

[0023] (3) The pretreatment SCR pickling tank heating device created by the present invention has a guide groove on the cover plate, so that the heated pickling liquid can flow more comprehensively in all directions of the pickling tank, thereby increasing the contact area between the preform rod to be cleaned and the pickling liquid.

[0024] (4) The pretreatment SCR pickling tank heating equipment created by the present invention uses a pneumatic diaphragm pump to realize the inlet and outlet of the pickling liquid. The whole process is fully automatic and does not require manual intervention, with high efficiency.

[0025] (5) The pretreatment SCR pickling tank heating equipment created by the present invention has simple and clear process pipelines, clear equipment modules, easy assembly, maintenance and adjustment, low overall cost, low construction difficulty, and is fully automatic, unmanned and monitored in real time during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings constituting part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0027] Figure 1 A schematic diagram of a pre-treatment SCR pickling tank heating device according to an embodiment of the present invention;

[0028] Figure 2 A top view of the pickling tank described in the embodiment of the present invention;

[0029] Figure 3 A cross-sectional view of the filling layer described in an embodiment of the present invention.

[0030] Description of reference numerals:

[0031] 1-pickling tank; 2-cover plate; 21-liquid inlet tank; 22-four-corner bracket; 23-guide groove; 3-circulating acid return pipe; 4-acid return pneumatic diaphragm pump; 5-acid return collection tank; 6-circulating liquid inlet pipe; 61-circulating liquid inlet; 7-liquid inlet pneumatic diaphragm pump; 8-heating tube; 81-liquid outlet; 82-liquid inlet; 83-liquid inlet cavity; 84-filling layer; 841-insulation layer; 842-pressure-resistant layer; 843-corrosion-resistant layer; 9-heating wire; 10-liquid inlet pump; 11-liquid inlet pipeline; 12-liquid storage tank. DETAILED DESCRIPTION

[0032] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0033] 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 a limitation on the present invention. In addition, the terms "first", "second", etc. 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", etc. 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.

[0034] In the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 invention can be understood according to specific circumstances.

[0035] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0036] like Figures 1 to 3 As shown, a pretreatment SCR pickling tank heating device comprises a liquid storage tank 12, a heating tube 8, and a pickling tank 1 connected in sequence, wherein the heating tube 1 is filled with a filling layer 84, and a liquid inlet cavity 83 for allowing the pickling liquid to flow through is opened in the filling layer 84, and a heating wire 9 is arranged in the liquid inlet cavity 83, and the liquid inlet end of the liquid inlet cavity 83 is connected with the liquid inlet port 82 at the top of the heating tube 8, and the liquid outlet end of the liquid inlet cavity 83 is connected with the liquid outlet port 81 at the lower part of the heating tube 8, and the liquid outlet port 81 is connected with the circulating acid inlet pipe 6, and the circulating liquid inlet port 61 of the circulating acid inlet pipe 6 is located above the cover plate 2, and the cover plate 2 is located at the bottom of the pickling tank 1, and a guide groove 23 is opened downward from the top of the cover plate 2.

[0037] The circulating acid inlet pipe 6 and the circulating acid return pipe 3 are both made of high-purity imported PP polypropylene material pipes.

[0038] This pretreatment SCR pickling tank heating equipment can solve the bottleneck of long single corrosion time and limited production capacity. It adds a heating device, increases the temperature of hydrofluoric acid, significantly improves its corrosion ability, reduces the process corrosion time, and increases equipment production capacity.

[0039] A liquid inlet groove 21 is opened downward at the top center of the cover plate 2 , and at least four guide grooves 23 are provided. The four guide grooves 23 are located around the liquid inlet groove 21 , and one end of the guide groove 23 is connected to the liquid inlet groove 21 .

[0040] The cover plate is a PP polypropylene cover plate, which is used for guiding circulating hot acid.

[0041] The guide groove 23 is inclined from the liquid inlet groove 21 toward the bottom of the cover plate 2 .

[0042] The cover plate 2 is provided with a guide groove 23 so that the heated pickling liquid can flow more comprehensively in all directions of the pickling tank 1, thereby increasing the contact area between the preform rod to be cleaned and the pickling liquid.

[0043] The bottom of the pickling tank 1 is provided with four-corner brackets 22 , and the cover plate 2 is fixed to the top of the four-corner brackets 22 .

[0044] It also includes a circulating acid return pipe 3, one end of which extends into the lower part of the pickling tank 1, and the other end of which is connected to the acid return collection tank 5 after passing through the acid return pneumatic diaphragm pump 4.

[0045] A liquid inlet pneumatic diaphragm pump 7 is provided between the liquid outlet 81 and the circulating liquid inlet 61 .

[0046] Use an acid-resistant pneumatic diaphragm pump to pump in and out the acid.

[0047] A pneumatic diaphragm pump is used to realize the inlet and outlet of the pickling liquid. The whole process is fully automatic and does not require manual intervention, with high efficiency.

[0048] The liquid inlet cavity 83 is a wave-shaped cavity matched with the heating wire 9 .

[0049] The provision of a wavy liquid inlet cavity 83 increases the contact area between the pickling liquid and the heating wire 9, improves the heating effect and reduces energy consumption.

[0050] The heating wire 9 is a hydrofluoric acid-resistant heating wire 9 , the heating wire 9 is electrically connected to the controller, and the outer wall of the heating wire 9 is sheathed with an acid-resistant PFA tube.

[0051] The filling layer 84 includes a heat preservation layer 841 , a pressure-resistant layer 842 , and a corrosion-resistant layer 843 from the outside to the inside.

[0052] The thermal insulation layer 841 is made of rubber-plastic thermal insulation material, the pressure-resistant layer 842 is made of polyethylene material with a molecular weight of 200,000-500,000, and the corrosion-resistant layer 843 is made of polytetrafluoroethylene material.

[0053] Rubber-plastic insulation materials are green and environmentally friendly, contain no chlorofluorides that are harmful to the atmosphere, and will not produce any pollutants that are harmful to the human body during installation and application. Their thermal conductivity coefficient is low and remains stable, and they have an insulating effect on any heat medium. They have good fire resistance and are B1 grade flame retardant materials.

[0054] The insulation layer 841 made of rubber-plastic insulation material can play a good role in heat insulation for the heating tube 8, reduce heat loss, and prevent the outer wall temperature of the heating tube 8 from being too high to cause safety hazards, so it is highly safe.

[0055] Polytetrafluoroethylene has excellent chemical stability, corrosion resistance and good anti-aging resistance. It can work for a long time at a temperature of +250℃ to -180℃. It can withstand all other chemicals except molten metal sodium and liquid fluorine, and will not change even when boiled in aqua regia.

[0056] The corrosion-resistant layer 843 made of polytetrafluoroethylene material can prevent the filling layer 84 from being corroded by the pickling liquid and has excellent corrosion resistance.

[0057] Polyethylene is a thermoplastic resin obtained by polymerization of ethylene. It has excellent low-temperature resistance (the lowest operating temperature can reach -100-70℃), good chemical stability, and can withstand corrosion from most acids and alkalis.

[0058] The pressure-resistant layer 842 made of polyethylene material with a molecular weight of 200,000-500,000 can not only prevent corrosion from pickling liquid, but also withstand high and low temperatures, and plays a two-way protective role as an intermediate layer.

[0059] Specific working process:

[0060] The preform to be cleaned is placed at the bottom of the pickling tank 1. The pickling liquid is pumped from the liquid storage tank 12 into the heating tube 8 through the liquid inlet pump 10, and the pickling liquid flows in from the liquid inlet 82, flows through the liquid inlet cavity 83, and then flows out from the liquid outlet 81. At the same time, the controller starts the heating wire 9 to heat the pickling liquid flowing through the liquid inlet cavity 83, so that the pickling liquid flowing through the liquid inlet cavity 83 is heated and then flows out from the liquid outlet 81.

[0061] The heated pickling liquid flowing out of the liquid outlet 81 flows into the liquid inlet tank 21 at the top of the cover plate 2 through the circulating liquid inlet pipe 6 and the acid inlet pneumatic diaphragm pump 7. Then the pickling liquid flows from the liquid inlet tank 21 through the guide grooves 23 around it and flows into the bottom of the pickling tank 1. At this time, the heated pickling liquid is used to soak and clean the preform rod. The cleaned pickling liquid passes through the circulating acid return pipe 3 and the acid return pneumatic diaphragm pump 4 in turn and flows into the acid return collection tank 5 for collection, which is used for subsequent recycling or subsequent treatment.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A pre-treatment SCR pickling tank heating device, characterized in that: The invention comprises a liquid storage tank (12), a heating tube (8), and a pickling tank (1) which are connected in sequence, wherein the heating tube (8) is filled with a filling layer (84), a liquid inlet cavity (83) for allowing pickling liquid to flow through is provided in the filling layer (84), a heating wire (9) is provided in the liquid inlet cavity (83), a liquid inlet end of the liquid inlet cavity (83) is connected to a liquid inlet port (82) at the top of the heating tube (8), a liquid outlet end of the liquid inlet cavity (83) is connected to a liquid outlet port (81) at the bottom of the heating tube (8), the liquid outlet port (81) is connected to a circulating acid inlet tube (6), a circulating liquid inlet port (61) of the circulating acid inlet tube (6) is located above a cover plate (2), the cover plate (2) is located at the bottom of the pickling tank (1), and a guide groove (23) is provided downwardly at the top of the cover plate (2); The filling layer (84) comprises, from the outside to the inside, a thermal insulation layer (841), a pressure-resistant layer (842), and a corrosion-resistant layer (843); The thermal insulation layer (841) is made of a rubber-plastic thermal insulation material, the pressure-resistant layer (842) is made of a polyethylene material with a molecular weight of 200,000-500,000, and the corrosion-resistant layer (843) is made of a polytetrafluoroethylene material; A liquid inlet groove (21) is provided downwardly at the center of the top of the cover plate (2), and at least four guide grooves (23) are provided. The four guide grooves (23) are located around the liquid inlet groove (21), and one end of the guide groove (23) is connected to the liquid inlet groove (21); The guide groove (23) is inclined from the liquid inlet groove (21) towards the bottom of the cover plate (2).

2. A pretreatment SCR pickling tank heating device according to claim 1, characterized in that: The bottom of the pickling tank (1) is provided with four-corner brackets (22), and the cover plate (2) is fixed to the top of the four-corner brackets (22).

3. A pretreatment SCR pickling tank heating device according to claim 1, characterized in that: It also includes a circulating acid return pipe (3), one end of which extends into the lower part of the pickling tank (1), and the other end of which passes through an acid return pneumatic diaphragm pump (4) and is connected to a acid return collection tank (5).

4. The pretreatment SCR pickling tank heating equipment according to claim 1 is characterized in that: A liquid inlet pneumatic diaphragm pump (7) is provided between the liquid outlet (81) and the circulating liquid inlet (61).

5. The pretreatment SCR pickling tank heating equipment according to claim 1 is characterized in that: The liquid inlet cavity (83) is a wave-shaped cavity that cooperates with the heating wire (9).

6. The pretreatment SCR pickling tank heating equipment according to claim 1 is characterized by: The heating wire (9) is a hydrofluoric acid-resistant heating wire (9), the heating wire (9) is electrically connected to the controller, and the outer wall of the heating wire (9) is sheathed with an acid-resistant PFA tube.

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