Descaling device for graphite heat exchanger

Abstract

The utility model relates to the technical field of descaling equipment, in particular to a descaling device for a graphite heat exchanger. A descaling device for a graphite heat exchanger comprises the graphite heat exchanger, a connecting pipe a and a connecting pipe b are connected to the side wall, close to the upper end, of the graphite heat exchanger, a connecting pipe c and a connecting pipe d are connected to the side wall, close to the lower end, of the graphite heat exchanger, the connecting pipe b is connected with a three-way pipe a, and the end of the connecting pipe c is connected with a three-way pipe b. And the three-way pipe a and the three-way pipe b are both connected with the backwashing assembly. According to the graphite heat exchanger, by arranging the backwashing assembly, hydrofluoric acid stored in the acid storage tank is heated to 40-45 DEG C in the graphite reactor and then cleans the graphite reactor from top to bottom, the flowing direction of the hydrofluoric acid is just opposite to the flowing direction of a pickling solution, and the problem that the inner wall of the graphite heat exchanger is blocked due to dirt and crystal substances generated when the pickling solution flows through is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a scale removing equipment technical field especially relates to a scale removing device for graphite heat exchanger. BACKGROUND

[0002] In the production and processing of glass, quartz sand is used. Acid washing of quartz is a very important step in the process of quartz sand. Acid washing of quartz sand can remove various impurities in quartz sand, including iron oxides, other oxides, yellow skin, water rust and organic dye bodies, etc. These impurities will affect the purity and quality of quartz sand. Through acid washing treatment, these impurities can be converted into soluble salts, thereby removing them from the quartz sand. In addition, acid washing can also remove harmful elements such as lead, chromium, mercury, etc. in the quartz lattice system, further improving the quality and stability of quartz sand.

[0003] The acid solution for acid washing of quartz sand needs to be heated before cleaning the quartz sand. The commonly used heating equipment is a heat exchanger. By passing steam into the heat exchanger, the acid solution also flows through the heat exchanger, and the heat of the steam will enter the acid solution to heat the acid solution. However, the acid solution for acid washing of quartz sand is continuously used in circulation, and only new acid solution is added from time to time. However, the previously circulated acid solution contains other impurities. The acid solution for acid washing of quartz sand in circulation will crystallize and scale on the inner wall of the graphite heat exchanger when it flows through the graphite heat exchanger, and finally will block the graphite heat exchanger, making it unable to work normally. UTILITY MODEL CONTENT

[0004] The utility model discloses a scale removing device for graphite heat exchanger, which aims to solve the problem that the acid solution for acid washing of quartz sand in circulation will crystallize and scale on the inner wall of the graphite heat exchanger when it flows through the graphite heat exchanger, and finally will block the graphite heat exchanger, making it unable to work normally.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A scale removing device for graphite heat exchanger, comprising a graphite heat exchanger, the graphite heat exchanger is connected with a connection pipe a and a connection pipe b on the side wall near the upper end, the graphite heat exchanger is connected with a connection pipe c and a connection pipe d on the side wall near the lower end, the connection pipe b is connected with a three-way pipe a, the end of the connection pipe c is connected with a three-way pipe b, the three-way pipe a and the three-way pipe b are connected with a backwashing assembly.

[0007] Specifically, the backwashing assembly comprises an output pipe, one end of the output pipe is provided with a circulating pump, the circulating pump is connected with an acid storage tank through a connecting pipe, one end of a reflux pipe is connected to the side wall of the acid storage tank.

[0008] Specific, the tee pipe a includes with the flange connection of the end of the adapter pipe b main pipe b, the main pipe b is fixedly connected with branch pipe a.

[0009] Specific, the tee pipe b includes with the flange connection of the end of the adapter pipe c main pipe c, the main pipe c is fixedly connected with branch pipe b.

[0010] Further, the other end of the output pipe is connected with the flange of the end of branch pipe a.

[0011] Further, the other end of the return pipe is connected with the flange of the end of branch pipe b.

[0012] Further, the end of the output pipe and return pipe connected with the storage tank is higher than the bottom end of the storage tank.

[0013] Further, the bottom end of the storage tank is provided with a slag discharge pipe, and the slag discharge pipe is provided with an electric valve a.

[0014] Further, the main pipe a, branch pipe a, main pipe b, branch pipe b are respectively provided with electric valves.

[0015] Further, the end of the connecting pipe connected with the storage tank is connected with a detachable filter screen.

[0016] Compared with the prior art, the beneficial effects are:

[0017] 1. By setting the backwashing assembly, the hydrogen fluoride stored in the storage tank can be heated to 40 to 45 degrees Celsius in the graphite heat exchanger, and then the graphite heat exchanger is cleaned from top to bottom, which is just opposite to the flow direction of the pickling solution, so that the dirt and crystalline substances on the inner wall of the graphite heat exchanger can be cleaned and removed, and the problem of dirt and crystalline substances caused by the flow of pickling solution on the inner wall of the graphite heat exchanger is solved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The overall structure schematic view of the descaling device for the graphite heat exchanger is provided.

[0019] Figure 2 The partial structure schematic view of the descaling device for the graphite heat exchanger is provided.

[0020] Figure 3 The backwashing device structure schematic view of the descaling device for the graphite heat exchanger is provided.

[0021] Figure 4 The connection schematic view of the connecting pipe, filter screen, circulating pump and output pipe of the descaling device for the graphite heat exchanger is provided.

[0022] In the figure: 1, graphite heat exchanger; 101, adapter pipe a; 102, adapter pipe b; 103, adapter pipe c; 104, adapter pipe d; 2, tee pipe a; 201, main pipe a; 202, branch pipe a; 3, tee pipe b; 301, main pipe b; 302, branch pipe b; 4, backwashing assembly; 401, output pipe; 402, circulating pump; 403, connecting pipe; 404, acid storage tank; 405, return pipe; 5, slag discharge pipe; 6, electric valve a; 7, filter screen; DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application.

[0024] Reference Figure 1 — Figure 4 The utility model discloses a kind of descaling devices for graphite heat exchanger, including graphite heat exchanger 1, graphite heat exchanger 1 is connected with adapter pipe a 101 and adapter pipe b 102 on the upper end side wall, graphite heat exchanger 1 is connected with adapter pipe c 103 and adapter pipe d 104 on the lower end side wall, adapter pipe b 102 is connected with tee pipe a 2, the end of adapter pipe c 103 is connected with tee pipe b 3, tee pipe a 2 and tee pipe b 3 are connected with backwashing assembly 4.

[0025] Backwashing assembly 4 includes output pipe 401, one end of output pipe 401 is installed with circulating pump 402, circulating pump 402 is connected with acid storage tank 404 by connecting pipe 403, one end of return pipe 405 is connected on the side wall of acid storage tank 404.

[0026] It needs to be explained that: acid storage tank 404 upper end is provided with openable upper cover, graphite heat exchanger 1 is prior art equipment, and its working principle and structure are not repeated.

[0027] Among them, tee pipe a 2 includes main pipe a 201 connected with the end flange of adapter pipe b 102, and branch pipe a 202 is fixedly connected on main pipe a 201.

[0028] Among them, tee pipe b 3 includes main pipe b 301 connected with the end flange of adapter pipe c 103, and branch pipe b 302 is fixedly connected on main pipe b 301.

[0029] Among them, the other end of output pipe 401 is connected with the flange of the end of branch pipe a 202.

[0030] Among them, the other end of return pipe 405 is connected with the flange of the end of branch pipe b 302.

[0031] The end of the output pipe 401 and the end of the reflux pipe 405 connected with the acid storage tank 404 are higher than the bottom end of the acid storage tank 404.

[0032] It should be noted that the end of the output pipe 401 and the end of the reflux pipe 405 connected with the acid storage tank 404 are higher than the bottom end of the acid storage tank 404 by a certain distance, which can ensure that the acid storage tank 404 will not be disturbed by the liquid refluxed into the acid storage tank 404, and the dirt will not be blocked by the filter screen 7.

[0033] The bottom end of the acid storage tank 404 is provided with a slag discharge pipe 5, and an electric valve a6 is installed on the slag discharge pipe 5. By setting the slag discharge pipe 5, the sediment dirt in the acid storage tank 404 and the acid liquid that has been used for a long time and has lost its effectiveness can be discharged.

[0034] The main pipe a201, the branch pipe a202, the main pipe b301 and the branch pipe b302 are respectively provided with electric valves.

[0035] The end of the connecting pipe 403 connected with the acid storage tank 404 is connected with a detachable filter screen 7. By setting the filter screen, the impurities floating in the hydrofluoric acid in the acid storage tank 404 can be filtered out to avoid entering the output pipe 401.

[0036] Working principle: The connecting pipe a101 and the connecting pipe d104 of the graphite heat exchanger 1 are respectively connected with the steam inlet pipe and the steam and steam cooling liquid discharge pipe,

[0037] When it is necessary to clean the dirt and crystalline substances generated on the inner wall of the graphite heat exchanger, first, close the electric valves on the main pipe a201 and the main pipe b301, open the electric valves on the branch pipe a202 and the branch pipe b302, and start the circulating pump 402. The hydrofluoric acid solution in the acid storage tank 404 is pumped to the main pipe a201 of the three-way pipe a2 through the connecting pipe 403 and the circulating pump 402 through the output pipe 401, and then enters the graphite heat exchanger 1. At the same time, the water vapor entering from the connecting pipe a101 heats the hydrofluoric acid solution in the graphite heat exchanger 1 to 40-45 degrees Celsius, and then the dirt and crystalline substances on the inner wall of the graphite heat exchanger 1 are washed by the upwardly heated hydrofluoric acid solution. The washed hydrofluoric acid solution and dirt are discharged from the main pipe b301 and enter the acid storage tank 404 through the reflux pipe 405, and the dirt is deposited at the bottom of the acid storage tank 404. At this time, the cleaning of the graphite heat exchanger 1 is completed.

[0038] When the graphite heat exchanger works normally, the electric valves on the branch pipes a202 and b302 are closed, and the electric valves on the main pipes a201 and b301 are opened, at this time, the pressurized pickling liquid of the pickling quartz sand will enter the graphite heat exchanger 1 from the main pipe a201, and the water vapor entering from the connecting pipe a101 will heat the pickling liquid through the graphite heat exchanger 1, the heated pickling liquid will be discharged through the connecting pipe b102 and the main pipe a201 to carry out subsequent pickling of the quartz sand in the pickling tank, and the connecting pipe d104 will discharge the water cooled by the water vapor.

[0039] The above merely describes a preferred specific implementation of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A descaling device for graphite heat exchanger, comprising a graphite heat exchanger (1), the graphite heat exchanger (1) is connected with a connecting pipe a (101) and a connecting pipe b (102) on the side wall near the upper end, the graphite heat exchanger (1) is connected with a connecting pipe c (103) and a connecting pipe d (104) on the side wall near the lower end, characterized in that: The adapter pipe b (102) is connected with a tee pipe a (2), the end of the adapter pipe c (103) is connected with a tee pipe b (3), the tee pipe a (2) and the tee pipe b (3) are connected with a backwashing assembly (4); The backwashing assembly (4) comprises an output pipe (401), one end of the output pipe (401) is provided with a circulating pump (402), the circulating pump (402) is connected with an acid storage tank (404) through a connecting pipe (403), one end of a reflux pipe (405) is connected to the sidewall of the acid storage tank (404).

2. The descaling device for graphite heat exchangers according to claim 1, characterized in that: The tee pipe a (2) comprises a main pipe a (201) connected with the flange at the end of the adapter pipe b (102), and a branch pipe a (202) fixedly connected to the main pipe a (201).

3. A descaling device for a graphite heat exchanger according to claim 2, wherein: The tee pipe b (3) comprises a main pipe b (301) connected with the flange at the end of the adapter pipe c (103), and a branch pipe b (302) fixedly connected to the main pipe b (301).

4. A descaling device for a graphite heat exchanger according to claim 3, wherein: The other end of the output pipe (401) is connected with the flange at the end of the branch pipe a (202).

5. A descaling device for a graphite heat exchanger according to claim 4, wherein: The other end of the reflux pipe (405) is connected with the flange at the end of the branch pipe b (302).

6. A descaling device for a graphite heat exchanger according to claim 5, wherein: The end of the output pipe (401) and the end of the reflux pipe (405) connected with the acid storage tank (404) are higher than the bottom end of the acid storage tank (404).

7. A descaling device for a graphite heat exchanger according to claim 6, wherein: The bottom end of the acid storage tank (404) is provided with a residue discharge pipe (5), and the residue discharge pipe (5) is provided with an electric valve a (6).

8. A descaling device for a graphite heat exchanger according to claim 7, wherein: The main pipe a (201), the branch pipe a (202), the main pipe b (301) and the branch pipe b (302) are respectively provided with electric valves.

9. A descaling device for a graphite heat exchanger according to claim 8, wherein: The end of the connecting pipe (403) connected with the acid storage tank (404) is connected with a detachable filter screen (7).

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