Sodium sulfite solution concentrating and preheating device

Abstract

The utility model discloses a sodium sulfite solution concentrating and preheating device. Belongs to the technical field of concentration preheating. According to the technical key points, the device comprises a tank body, a cover plate is arranged on the tank body, a liquid inlet pipe is arranged on the cover plate, and a liquid discharge pipe is arranged at the bottom of the tank body; a plurality of through holes are formed in the cover plate, detachable heat exchange modules are arranged in the through holes, and sealing assemblies are arranged between the heat exchange modules and the through holes; a heat supply assembly connected with the heat exchange module is arranged on the tank body; the utility model aims to provide a sodium sulfite solution concentrating and preheating device which is simple in structure and convenient to clean. The device is used for preheating a sodium sulfite solution before evaporation and concentration.

Description

Technical Field

[0001] The utility model relates to a preheating device, and more specifically, to a preheating device for concentrating sodium sulfite solution. Background Art

[0002] Sodium metabisulfite belongs to a chemical product at the front end of the industrial chain with low added value. In the current market business environment, how to reduce costs and increase efficiency has become a key issue for sodium metabisulfite production enterprises. One of the main raw materials of current sodium metabisulfite, soda ash, accounts for about 75% of the total production cost in the production process. Our company found in the production process that using the recycled sodium sulfite solution as a substitute raw material can effectively reduce the soda ash consumption, thereby achieving the purpose of reducing production costs and at the same time broadening the selectivity of raw material use.

[0003] During production, 15% of the sodium sulfite solution recycled in the production process needs to be heated and concentrated first. When the concentration is concentrated to about 40%, it is added to the causticizing tank and mixed with the soda ash solution for use. In order to improve the concentration efficiency, the solution in the recovery tank needs to be preheated before concentrating and heating. During the heating process, a small amount of crystals will be produced on the surface of the heating coil in the sodium sulfite solution, affecting the heat exchange efficiency. Currently, the heating coil is usually fixedly installed in the recovery tank, and the cover plate needs to be opened to enter for cleaning. This method is not only difficult to clean the heating coil, but also there will be a small amount of toxic gas in the recovery tank when the sodium sulfite is heated, affecting the safety of workers. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a sodium sulfite solution concentration preheating device with a simple structure and convenient cleaning in view of the above-mentioned deficiencies of the prior art.

[0005] The technical solution of the utility model is realized as follows: A sodium sulfite solution concentration preheating device includes a tank body, a cover plate is provided on the tank body, a liquid inlet pipe is provided on the cover plate, and a liquid discharge pipe is provided at the bottom of the tank body; a plurality of through holes are provided on the cover plate, and a detachable heat exchange module is provided in each through hole, and a sealing component is provided between the heat exchange module and the through hole; a heating component connected to the heat exchange module is provided on the tank body.

[0006] In the above-mentioned sodium sulfite solution concentration preheating device, the heat exchange module includes a stepped seat body, and two cavities are provided in the seat body through a partition; a heat exchange coil communicated with the cavity is provided at the bottom of the seat body, and a liquid supply pipe and a return pipe connected to the heating component are respectively provided on the two cavities.

[0007] In the above-mentioned sodium sulfite solution concentration preheating device, the sealing component includes an annular groove provided at the upper end of the through hole, and a rubber pad adapted to the outer wall of the seat body is provided in the annular groove.

[0008] In the above-mentioned sodium sulfite solution concentration and preheating device, the heating component includes several brackets arranged at the upper end of the tank body. Two annular pipes are vertically distributed on the brackets. The annular pipes are installed on the brackets through pipe clamps. The two annular pipes are respectively connected to the liquid supply end and the return end of an external fluid heat source; hoses corresponding to each heat exchange module are provided on both annular pipes; connection nuts are provided at the ends of the hoses through threads.

[0009] In the above-mentioned sodium sulfite solution concentration and preheating device, an inspection opening is provided on the cover plate, and a sealing flap is hinged at the inspection opening.

[0010] In the above-mentioned sodium sulfite solution concentration and preheating device, a cross beam is provided near the end of the open end of the tank body, and a protective net is provided on the cross beam.

[0011] After the present utility model adopts the above structure, by detachably arranging the heat exchange module on the cover plate, when cleaning is required, the heat exchange module can be directly disassembled and taken out, which is convenient for cleaning crystals, can effectively ensure the heat exchange efficiency, and there is no need for personnel to enter the tank body, which can ensure the safety of the cleaning personnel. Description of the Drawings

[0012] The following further details the present utility model with reference to the embodiments in the drawings, but does not constitute any limitation to the present utility model.

[0013] Figure 1 is the structural schematic diagram of the present utility model;

[0014] Figure 2 is the cross-sectional structural schematic diagram of the present utility model;

[0015] Figure 3 is the structural schematic diagram of the tank body of the present utility model;

[0016] Figure 4 is the partial structural schematic diagram at position A of the present utility model;

[0017] Figure 5 is the structural schematic diagram of the cover plate of the present utility model.

[0018] In the figure: 1, tank body; 2, cover plate; 3, liquid inlet pipe; 4, liquid discharge pipe; 5, through hole; 6, heat exchange module; 6a, seat body; 6b, cavity; 6c, heat exchange coil; 6d, liquid supply pipe; 6e, return pipe; 7, sealing component; 7a, annular groove; 7b, rubber pad; 8, heating component; 8a, bracket; 8b, annular pipe; 8c, pipe clamp; 8d, hose; 8e, connection nut; 9, inspection opening; 10, sealing flap; 11, cross beam; 12, protective net. Detailed Embodiments

[0019] Refer to Figures 1-5As shown in the figure, a sodium sulfite solution concentration and preheating device of the present utility model includes a tank body 1, a cover plate 2 is provided on the tank body 1, a liquid inlet pipe 3 is provided on the cover plate 2, and a liquid discharge pipe 4 is provided at the bottom of the tank body 1; a plurality of through holes 5 are provided on the cover plate 2, and a detachable heat exchange module 6 is provided in each through hole 5, and a sealing component 7 is provided between the heat exchange module 6 and the through hole 5; a heating component 8 connected to the heat exchange module 6 is provided on the tank body 1. The liquid inlet pipe is connected to the sodium sulfite solution recovery system, and the liquid discharge pipe is connected to the heating and concentration equipment. Corresponding valves are provided on both the liquid inlet pipe and the liquid discharge pipe, which is common knowledge for those skilled in the art and will not be elaborated here.

[0020] By detachably arranging the heat exchange module on the cover plate, when cleaning is required, the heat exchange module can be directly disassembled and taken out, which is convenient for cleaning crystals, can effectively ensure the heat exchange efficiency, and there is no need for personnel to enter the tank body, which can ensure the safety of the cleaning personnel.

[0021] A negative pressure device for extracting the volatile toxic gas in the tank body and devices such as a thermometer for detecting temperature are also connected to the cover plate, which is common knowledge for those skilled in the art and will not be elaborated here.

[0022] In this embodiment, the heat exchange module 6 includes a stepped seat body 6a, and two cavities 6b are provided in the seat body 6a through a partition; a heat exchange coil 6c communicated with the cavity 6b is provided at the bottom of the seat body 6a, and a liquid supply pipe 6d and a return pipe 6e connected to the heating component 8 are respectively provided on the two cavities 6b. The lower end of the seat body is matched with the through hole and the height is greater than the thickness of the cover plate, reducing the gap between the seat body and the through hole during installation. The stepped seat body can fix the heat exchange module on the cover plate without setting additional positioning structures, which is convenient for installation.

[0023] The heat exchange coil includes a straight section communicated with the liquid supply pipe and a coil section communicated with the return pipe. The fluid quickly enters the lower end of the solution through the straight section and then rises along the coil section, ensuring sufficient heat exchange time and contact area between the heat exchange coil and the solution. At the same time, using the straight section to quickly transport the fluid can ensure that the fluid has a higher temperature when reaching the lower end, which can effectively improve the preheating effect on the inside of the solution.

[0024] In this embodiment, the sealing component 7 includes an annular groove 7a provided at the upper end of the through hole 5, and a rubber pad 7b adapted to the outer wall of the seat body 6a is provided in the annular groove 7a. The rubber pad is pressed by the stepped ring on the seat body for sealing, ensuring that the volatile gas during the preheating process will not overflow and pollute the external air. This sealing structure is convenient for disassembly and assembly.

[0025] In this embodiment, the heating assembly 8 includes a plurality of brackets 8a arranged at the upper end of the tank body 1, and two annular tubes 8b are vertically distributed on the brackets 8a. The annular tubes 8b are installed on the brackets 8a through pipe clamps 8c, and the two annular tubes 8b are respectively connected to the liquid supply end and the return end of the external fluid heat source; the two annular tubes 8b are provided with hoses 8d connected to each heat exchange module 6 in a one-to-one correspondence; the ends of the hoses 8d are provided with connecting nuts 8e through threads. The heat exchange module is provided with pipes that match the hoses, which are the liquid supply pipe and the return pipe in this embodiment. The liquid supply pipe and the return pipe are both provided with threads that match the connecting nuts. The hoses and the heat exchange module are connected through the connecting nuts, which is convenient for disassembly and assembly.

[0026] In this embodiment, preferably, the cover plate 2 is provided with an inspection port 9, and a sealing flap 10 is hinged at the inspection port 9. The inspection port is provided to facilitate inspection and maintenance of the inside of the tank body, and the specific structure of the sealing flap is prior art and will not be described in detail here.

[0027] Further preferably, a cross beam 11 is provided near the opening end of the tank body 1, and a protective net 12 is provided on the cross beam 11. The protective net is provided to ensure the personal safety of the staff and prevent the staff from accidentally falling when opening the inspection port for inspection.

[0028] During operation, the sodium sulfite solution generated in the production of sodium metabisulfite is recovered and input into the tank through the liquid inlet pipe for temporary storage. The external fluid heat source transmits hot water or hot air with a temperature of 60-80°C to the heat exchange coil, and the sodium sulfite solution in the tank is heated to 55-60°C. The sodium sulfite solution is then transported into the heating and concentrating equipment through the discharge pipe for concentration.

[0029] When cleaning is required, first drain the solution in the tank and the fluid in the ring tube, loosen the connecting nut, remove the hose, and then pull the heat exchange coil out of the through hole.

[0030] The above embodiments are preferred implementation modes of the present invention and are only used to facilitate the explanation of the present invention. They are not intended to limit the present invention in any form. Any person with ordinary knowledge in the relevant technical field, if they do not depart from the scope of the technical features of the present invention, can make equivalent embodiments by partial changes or modifications to the technical contents disclosed in the present invention, and they still fall within the scope of the technical features of the present invention without departing from the technical features of the present invention.

Claims

1. A sodium sulfite solution concentration and preheating device, comprising a tank body (1), characterized in that: The tank body (1) is provided with a cover plate (2), a liquid inlet pipe (3) is provided on the cover plate (2), and a liquid discharge pipe (4) is provided at the bottom of the tank body (1); a plurality of through holes (5) are provided on the cover plate (2), a detachable heat exchange module (6) is provided in each through hole (5), and a sealing component (7) is provided between the heat exchange module (6) and the through hole (5); and a heat supply component (8) connected to the heat exchange module (6) is provided on the tank body (1).

2. A sodium sulfite solution concentration and preheating device according to claim 1, characterized in that: The heat exchange module (6) comprises a stepped seat (6a), wherein two cavities (6b) are arranged in the seat (6a) via a partition; a heat exchange coil (6c) communicating with the cavity (6b) is arranged at the bottom of the seat (6a), and a liquid supply pipe (6d) and a return pipe (6e) connected to a heat supply component (8) are respectively arranged on the two cavities (6b).

3. A sodium sulfite solution concentration and preheating device according to claim 2, characterized in that: The sealing assembly (7) comprises an annular groove (7a) arranged at the upper end of the through hole (5), and a rubber pad (7b) adapted to the outer wall of the seat body (6a) is arranged in the annular groove (7a).

4. A sodium sulfite solution concentration and preheating device according to claim 1, characterized in that: The heating assembly (8) comprises a plurality of brackets (8a) arranged at the upper end of the tank body (1), two annular tubes (8b) are vertically distributed on the brackets (8a), the annular tubes (8b) are mounted on the brackets (8a) via a pipe clamp (8c), and the two annular tubes (8b) are respectively connected to a liquid supply end and a return end of an external fluid heat source; a hose (8d) connected one-to-one with each heat exchange module (6) is provided on the two annular tubes (8b); and a connecting nut (8e) is provided at the end of the hose (8d) via a thread.

5. A sodium sulfite solution concentration and preheating device according to claim 1, characterized in that: The cover plate (2) is provided with an inspection opening (9), and a sealing flap (10) is hingedly connected to the inspection opening (9).

6. A sodium sulfite solution concentration and preheating device according to claim 5, characterized in that: A cross beam (11) is provided at the proximal end of the opening end of the tank body (1), and a protective net (12) is provided on the cross beam (11).

Images