Feeding device for plate heat exchanger in aluminum oxide production

Abstract

The utility model aims to provide a feeding device of a plate heat exchanger for aluminum oxide production. The feeding device comprises a filtrate storage tank, a power air pipe, a slurry pump, a slurry pipe I, a slurry pipe II, a slurry tank, a feeding pipe, a feeding pump and a slurry pipe, a power air pipe is arranged on one side of the bottom of the filtrate storage tank and is communicated with a wind power source; a slurry pipe I is arranged on the other side of the bottom of the filtrate storage tank, the slurry pipe I is connected with an inlet of a slurry pump, an outlet of the slurry pump is connected with a slurry pipe through a slurry pipe II, and the slurry pipe is connected with the top of the slurry tank; a feeding pipe is arranged in the middle of the filtrate storage tank, the feeding pipe is connected with an inlet of a feeding pump, and an outlet of the feeding pump is connected with an inlet of a plate heat exchanger through a pipeline. The plate heat exchanger can effectively reduce suspended matters in filtrate entering the plate heat exchanger, well avoid blockage of a heat exchanger channel and improve the working stability of heat exchanger equipment.

Description

Technical Field

[0001] The utility model relates to the technical field of auxiliary equipment for plate heat exchangers, in particular to a feeding device for a plate heat exchanger in the production of aluminum oxide. Background Art

[0002] The plate heat exchanger is a new type of high-efficiency heat exchanger made of a series of metal sheets with a certain corrugated shape. Thin rectangular channels are formed between various plates, and heat is exchanged through the plates. It has the characteristics of high heat exchange efficiency, small heat loss, compact and light structure, small footprint, easy installation and cleaning, wide application, and long service life. Under the same pressure loss, its heat transfer coefficient is 3-5 times higher than that of the shell and tube heat exchanger, and the footprint is one-third of that of the tube heat exchanger. The heat recovery rate can be as high as more than 90%.

[0003] At present, plate heat exchangers are widely used in heat exchange in the alumina production process. However, there are certain shortcomings in the use of plate heat exchangers in the production of alumina, that is, the channel of the plate heat exchanger is frequently blocked: After the plate heat exchanger is put into production, the channel is frequently blocked due to the influence of a large amount of floating matter in the filtrate entering the plate heat exchanger. When floating matter is entrained in the filtrate, it is affected by the density and damage of the filter cloth, the particle size of aluminum hydroxide and the vacuum degree. The floating matter (mainly aluminum hydroxide) contained in the filtrate is generally 3.0~5.0g / l. After the filtrate with floating matter enters the plate heat exchanger, the flow rate decreases, and the floating matter adheres to the wall of the heat exchanger channel and deposits, which can form scars in a short time and cause channel blockage. The heat exchange efficiency of the blocked plate heat exchanger decreases, and it is forced to withdraw from operation for chemical cleaning.

[0004] In summary, in the current use of plate heat exchangers, excessive suspended matter entrained in the filtrate will cause blockage of the plate heat exchanger channel, affecting the heat exchange efficiency of the plate heat exchanger and requiring corresponding technical improvements. Summary of the invention

[0005] The utility model aims to provide a feeding device for a plate heat exchanger in alumina production, which can effectively reduce the floating matter in the filtrate from entering the plate heat exchanger, better avoid the blockage of the heat exchanger channel, and improve the working stability of the heat exchanger equipment.

[0006] The feeding device of the plate heat exchanger for alumina production comprises a filtrate storage tank, a power air duct, a slurry pump, a slurry pipe I, a slurry pipe II, a slurry tank, a feeding pipe, a feeding pump, and a slurry pipe;

[0007] A power air duct is provided on one side of the bottom of the filtrate storage tank, and the power air duct is connected to a wind source;

[0008] A slurry pipe I is provided on the other side of the bottom of the filtrate storage tank, the slurry pipe I is connected to the inlet of the slurry pump, the outlet of the slurry pump is connected to the slurry pipe through the slurry pipe II, and the slurry pipe is connected to the top of the slurry tank;

[0009] A feed pipe is provided in the middle of the filtrate storage tank, the feed pipe is connected to the inlet of a feed pump, and the outlet of the feed pump is connected to the inlet of a plate heat exchanger through a pipeline.

[0010] The feeding pipe is provided with a feeding valve.

[0011] The slurry pipe I is provided with a slurry valve I at a position close to the bottom of the filtrate storage tank.

[0012] The slurry pipe II is provided with a slurry valve II near the outlet of the slurry pump.

[0013] A discharge pipe is arranged at the bottom of the filtrate storage tank, and a discharge valve is arranged on the discharge pipe.

[0014] The slurry tanks are provided with two groups, the two ends of the slurry pipes are respectively connected to the top of one group of slurry tanks, and the slurry pipe II is connected to the middle of the slurry pipes.

[0015] Slurry valves are respectively arranged on both sides of the slurry pipe.

[0016] The alumina production plate heat exchanger feeding device also includes a flushing pump, the inlet of the flushing pump is connected to the filtrate source through a pipeline, the outlet of the flushing pump is connected to the slurry pipe I through a flushing pipe, and two groups of flushing valves are arranged on the flushing pipe at intervals.

[0017] The slurry pipe II is provided with a discharge pipe at its lowest point, and a discharge valve is provided on the discharge pipe.

[0018] The working principle of the utility model is as follows:

[0019] The device of the utility model adds a power air duct at the bottom of the filtrate storage tank, and turns on the power wind to stir the bottom of the storage tank, so that the filtrate with high concentration of suspended solids can flow smoothly into the slurry pump, and then the slurry pump is used to transport the filtrate with high concentration of suspended solids to the slurry tank, thereby achieving the function of continuously reducing the suspended solids in the filtrate entering the plate heat exchanger. After a period of use, the filtrate can be passed in for flushing, cleaning the slurry pipe I, slurry pipe II and other slag discharge pipelines, ensuring the effect of discharging suspended solids in the filtrate and ensuring the stable operation of the equipment.

[0020] The beneficial effects of the utility model are:

[0021] The device of the utility model has reasonable structural design, concise and compact process, and easy operation, and can realize the continuous delivery of high-concentration filtrate into the slurry tank, and can realize the function of continuously reducing the entry of suspended solids in the filtrate into the plate heat exchanger.

[0022] After the device of the utility model is used, the suspended matter in the filtrate entering the plate heat exchanger is reduced to below 1g / l, and the suspended matter in the filtrate entering the slurry tank is between 45g / l and 150g / l. The amount of filtrate entering the slurry tank only accounts for 1 / 45 of the total amount of produced slurry, which has almost no effect on the solid content of the slurry, will not affect other processes, and ensures the effective recycling of materials.

[0023] The device of the utility model reduces the entry of floating matter into the plate heat exchanger, reduces the discharge operation of the storage tank, and recovers a large amount of floating matter. It is practical and efficient, especially avoiding the frequent withdrawal from production chemical cleaning operations after the heat exchange efficiency of the plate heat exchanger decreases, reducing the workload of operators who frequently operate the valves of the plate heat exchanger for chemical cleaning, reducing the safety risks of the operation, and also reducing the steam cost and alkali solution waste of chemical cleaning.

[0024] The device of the utility model reduces floating matter entering the plate heat exchanger from the source, solves the problem of frequent blockage of the plate heat exchanger channel, promotes the inherent safety of the equipment and operational safety on the basis of improving the operating efficiency of the plate heat exchanger, has strong versatility, and has good application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of a feeding device for alumina production plate heat exchanger according to an embodiment;

[0026] The serial numbers and names in the figure are as follows:

[0027] 1-filtrate storage tank, 2-power air duct, 3-slurry pump, 4-slurry pipe I, 5-slurry pipe II, 6-slurry tank, 7-feeding pipe, 8-feeding pump, 9-slurry pipe, 10-feeding valve, 11-slurry valve I, 12-slurry valve II, 13-discharge pipe, 14-discharge valve, 15-slurry valve, 16-flushing pump, 17-flushing pipe, 18-flushing valve, 19-discharge pipe, 20-discharge valve. DETAILED DESCRIPTION

[0028] The present invention is described in detail below with reference to the accompanying drawings and embodiments. Example 1

[0029] like Figure 1 As shown, the feeding device of the plate heat exchanger for alumina production includes a filtrate storage tank 1, a power air duct 2, a slurry pump 3, a slurry pipe I 4, a slurry pipe II 5, a slurry tank 6, a feeding pipe 7, a feeding pump 8, and a slurry pipe 9;

[0030] A power air duct 2 is provided on one side of the bottom of the filtrate storage tank 1, and the power air duct 2 is connected to a wind source;

[0031] A slurry pipe I4 is provided on the other side of the bottom of the filtrate storage tank 1. A slurry valve I11 is provided on the slurry pipe I4 near the bottom of the filtrate storage tank 1. The slurry pipe I4 is connected to the inlet of the slurry pump 3. The outlet of the slurry pump 3 is connected to the slurry pipe 9 through the slurry pipe II5. A slurry valve II12 is provided on the slurry pipe II5 near the outlet of the slurry pump 3. The slurry pipe 9 is connected to the top of the slurry tank 6. The slurry tank 6 is provided with two groups. The two ends of the slurry pipe 9 are respectively connected to the top of one group of slurry tanks 6. The slurry pipe II5 is connected to the middle of the slurry pipe 9. Slurry valves 15 are provided on both sides of the slurry pipe 9.

[0032] A feed pipe 7 is provided in the middle of the filtrate storage tank 1, and the feed pipe 7 is connected to the inlet of a feed pump 8. A feed valve 10 is provided on the feed pipe 7. The outlet of the feed pump 8 is connected to the inlet of the plate heat exchanger through a pipeline.

[0033] A discharge pipe 13 is provided at the bottom of the filtrate storage tank 1 , and a discharge valve 14 is provided on the discharge pipe 13 .

[0034] It also includes a flushing pump 16, the inlet of which is connected to the filtrate source through a pipeline, and the outlet of which is connected to the slurry pipe I4 through a flushing pipe 17, and two groups of flushing valves 18 are arranged at intervals on the flushing pipe 17. The slurry pipe II5 is provided with a discharge pipe 19 at its lowest point, and a discharge valve 20 is arranged on the discharge pipe 19.

Claims

1. A feeding device for a plate heat exchanger in the production of alumina, comprising a filtrate storage tank (1), a power air duct (2), a slurry pump (3), a slurry pipe I (4), a slurry pipe II (5), a slurry tank (6), a feeding pipe (7), a feeding pump (8), and a slurry pipe (9); characterized in that: A power air duct (2) is provided on one side of the bottom of the filtrate storage tank (1), and the power air duct (2) is connected to a wind source; A slurry pipe I (4) is provided on the other side of the bottom of the filtrate storage tank (1), the slurry pipe I (4) is connected to the inlet of the slurry pump (3), the outlet of the slurry pump (3) is connected to the slurry pipe (9) via the slurry pipe II (5), and the slurry pipe (9) is connected to the top of the slurry tank (6); A feed pipe (7) is provided in the middle of the filtrate storage tank (1), the feed pipe (7) is connected to the inlet of a feed pump (8), and the outlet of the feed pump (8) is connected to the inlet of the plate heat exchanger through a pipeline.

2. The feeding device for the plate heat exchanger for alumina production according to claim 1, characterized in that: The feeding pipe (7) is provided with a feeding valve (10).

3. The feeding device for the plate heat exchanger for alumina production according to claim 1, characterized in that: The slurry pipe I (4) is provided with a slurry valve I (11) at a position close to the bottom of the filtrate storage tank (1).

4. The feeding device for the plate heat exchanger for alumina production according to claim 1, characterized in that: The slurry pipe II (5) is provided with a slurry valve II (12) near the outlet of the slurry pump (3).

5. The feeding device for the plate heat exchanger for alumina production according to claim 1, characterized in that: A discharge pipe (13) is provided at the bottom of the filtrate storage tank (1), and a discharge valve (14) is provided on the discharge pipe (13).

6. The feeding device for the plate heat exchanger for alumina production according to claim 1, characterized in that: The slurry troughs (6) are provided in two groups, the two ends of the slurry pipe (9) are respectively connected to the top of one group of slurry troughs (6), and the slurry pipe II (5) is connected to the middle of the slurry pipe (9).

7. The feeding device for the plate heat exchanger for aluminum oxide production according to claim 6, characterized in that: Slurry valves (15) are respectively provided on both sides of the slurry pipe (9).

8. The feeding device for the plate heat exchanger for alumina production according to claim 1, characterized in that: It also includes a flushing pump (16), the inlet of the flushing pump (16) is connected to the filtrate source through a pipeline, the outlet of the flushing pump (16) is connected to the slurry pipe I (4) through a flushing pipe (17), and two groups of flushing valves (18) are arranged on the flushing pipe (17) at intervals.

9. The feeding device for the plate heat exchanger for alumina production according to claim 1, characterized in that: The slurry pipe II (5) is provided with a discharge pipe (19) at its lowest point, and the discharge pipe (19) is provided with a discharge valve (20).

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