阅读说明：本技术 一种用于工业废水处理的可自清洗板式降膜蒸发系统 (Self-cleaning plate type falling film evaporation system for industrial wastewater treatment ) 是由 王金玉 姚冰 孙勇 李迪 余三江 陆先山 朱栋梁 黄建德 于 2021-07-26 设计创作，主要内容包括：本发明提出了一种用于工业废水处理的可自清洗板式降膜蒸发系统,包括原水槽以及蒸发塔,于所述原水槽和蒸发塔之间设置有喷淋管路,所述喷淋管路上设置有喷淋泵；所述蒸发塔包括设置在支撑架上的壳体,于壳体内设置有板式换热器,所述喷淋管路深入蒸发塔内且于喷淋管路末端设置有喷淋头,所述喷淋头位于板式换热器上方；于所述蒸发塔顶部设置有出料口,所述出料口与蒸汽冷凝器连通。本发明于真空减压下加热完成对料液的蒸发,同时采用对所述蒸发塔组件进行定期不停机清洗,以保证其有效蒸发时间,提高蒸发效率和经济效益。(The invention provides a self-cleaning plate type falling film evaporation system for industrial wastewater treatment, which comprises a raw water tank and an evaporation tower, wherein a spray pipeline is arranged between the raw water tank and the evaporation tower, and a spray pump is arranged on the spray pipeline; the evaporation tower comprises a shell arranged on a support frame, a plate heat exchanger is arranged in the shell, the spray pipeline extends into the evaporation tower, a spray head is arranged at the tail end of the spray pipeline, and the spray head is positioned above the plate heat exchanger; and a discharge port is arranged at the top of the evaporation tower and communicated with the steam condenser. The invention completes the evaporation of the feed liquid by heating under vacuum decompression, and simultaneously cleans the evaporation tower component without stopping at regular intervals so as to ensure the effective evaporation time and improve the evaporation efficiency and the economic benefit.)

1. A self-cleaning plate type falling film evaporation system for industrial wastewater treatment is characterized by comprising a raw water tank (1) and an evaporation tower (9), wherein a spraying pipeline (3) is arranged between the raw water tank (1) and the evaporation tower (9), and a spraying pump (10) is arranged on the spraying pipeline (3);

the evaporation tower (9) comprises a shell (20) arranged on a support frame (11), a plate heat exchanger (13) is arranged in the shell (20), the spray pipeline (3) extends into the evaporation tower (9), a spray header (14) is arranged at the tail end of the spray pipeline (3), and the spray header (14) is positioned above the plate heat exchanger (13); a discharge hole (15) is formed in the top of the evaporation tower (9), and the discharge hole (15) is communicated with the steam condenser (4).

2. The self-cleanable plate falling film evaporation system for industrial wastewater treatment according to claim 1, wherein the plate heat exchanger (13) comprises a plurality of ultrasonic vibration plates (12), and the ultrasonic vibration plates (12) are symmetrically fixed on the inner wall of the shell (20) by vibration plate positioning blocks (18).

3. The self-cleaning plate type falling film evaporation system for industrial wastewater treatment according to claim 1, wherein a steam inlet pipeline (16) and a steam outlet pipeline (19) are additionally arranged in the evaporation tower (9), and the steam inlet pipeline (16) and the steam outlet pipeline (19) are respectively positioned at the upper side and the lower side of the plate type heat exchanger (13) and are used as heating heat sources to provide heat for evaporation of feed liquid in the evaporation tower (9).

4. The self-cleanable plate falling film evaporation system for industrial wastewater treatment according to claim 1, wherein a mist eliminator (17) is arranged at the top of the evaporation tower (9), and the mist eliminator (17) is located before the discharge port (15).

5. The self-cleanable plate falling film evaporation system for industrial wastewater treatment according to claim 1, wherein a residue discharge port is provided at the bottom of the evaporation tower (9) for removing residue settled during the evaporation process.

6. The self-cleaning plate type falling film evaporation system for industrial wastewater treatment according to claim 1, further comprising a water return pump (22), wherein the water return pump (22) is located on a water return pipeline (2), and the two ends of the water return pipeline (2) are respectively provided with the evaporation tower (9) and the raw water tank (1) for pumping the surplus feed liquid in the evaporation tower (9) back to the raw water tank (1) for re-circulating evaporation.

7. The self-cleanable plate falling film evaporation system for industrial wastewater treatment according to claim 1, wherein a negative pressure water discharger (8) is connected to the steam condenser (4) for discharging condensed water condensed by the steam condenser (4).

8. The self-cleaning plate type falling film evaporation system for industrial wastewater treatment according to claim 1, wherein a steam-water separator (5), a buffer tank (7) and a vacuum pump (6) are sequentially connected to the steam condenser (4) for maintaining a certain vacuum degree of the system.

9. The self-cleanable plate falling film evaporation system for industrial wastewater treatment according to claim 1, wherein an interlayer is provided in the steam condenser (4), the interlayer being in communication with a cooling water tank for circulating cooling water in the interlayer for condensing steam discharged from the evaporation tower (9).

Technical Field

The invention relates to the technical field of environmental engineering, in particular to a self-cleaning plate type falling film evaporation system for industrial wastewater treatment.

Background

The evaporator separates impurities in a suspended state in industrial wastewater from water by using a physical method in the process of not changing the basic chemical properties of the water, and is widely applied to the fields of food, pharmacy, biochemical engineering and the like at present. The falling film evaporator is heated under a vacuum decompression state to complete evaporation, low-temperature evaporation can be realized, the evaporation rate is high, the retention time of feed liquid in equipment is short, and continuous feeding and discharging can be realized. In addition, the generated secondary steam can be used as a heating source, the energy-saving effect is obvious, and the running cost is lower compared with other types of evaporators such as forced circulation and the like. Some falling liquid film evaporator are inside mostly to coil pipe or tubulation structure for the evaporator is whole great, and inside tube bank is difficult for dismantling, if trade the inside pipeline for the slab bundle of compriseing a plurality of slabs, can reduce its occupation space greatly, and the slab bundle dismantles comparatively easily.

In practical industrial application, in the process of long-term use of the evaporator, particularly when the equipment is used in discontinuous operation, a scale layer is easily generated inside the evaporator to influence heat transfer, and the production capacity of the evaporator is directly influenced to a great extent. The problem that the shell side dirt of the evaporator is difficult to clean is a hot spot problem for improving the production capacity of the evaporator.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, provides a self-cleaning plate type falling film evaporation system for industrial wastewater treatment, has high evaporation efficiency and small occupied space, and can be used for self-cleaning of industrial wastewater treatment.

In order to solve the technical problems, the invention adopts the technical scheme that: a self-cleaning plate type falling film evaporation system for industrial wastewater treatment is characterized by comprising a raw water tank and an evaporation tower, wherein a spray pipeline is arranged between the raw water tank and the evaporation tower, and a spray pump is arranged on the spray pipeline;

the evaporation tower comprises a shell arranged on a support frame, a plate heat exchanger is arranged in the shell, the spray pipeline extends into the evaporation tower, a spray head is arranged at the tail end of the spray pipeline, and the spray head is positioned above the plate heat exchanger; and a discharge port is arranged at the top of the evaporation tower and communicated with the steam condenser.

Further, the plate heat exchanger comprises a plurality of ultrasonic vibration plates, and the ultrasonic vibration plates are symmetrically fixed on the inner wall of the shell through vibration plate positioning blocks.

Furthermore, a steam inlet pipeline and a steam outlet pipeline are additionally arranged in the evaporation tower, and the steam inlet pipeline and the steam outlet pipeline are respectively positioned at the upper side and the lower side of the plate heat exchanger and are used as heating heat sources to provide heat for evaporation of the feed liquid in the evaporation tower.

Furthermore, a mist eliminator is arranged at the top of the evaporation tower and is positioned in front of the discharge hole.

Furthermore, a slag discharge port is arranged at the bottom of the evaporation tower and used for removing filter residues settled in the evaporation process.

And the water return pump is positioned on a water return pipeline, and the two ends of the water return pipeline are respectively provided with the evaporation tower and the raw water tank and are used for pumping the redundant feed liquid in the evaporation tower back to the raw water tank for circulating evaporation again.

Furthermore, a negative pressure water discharger is connected to the steam condenser and used for discharging condensed water condensed by the steam condenser.

Furthermore, a steam-water separator, a buffer tank and a vacuum pump are sequentially connected to the steam condenser and used for maintaining a certain vacuum degree of the system.

Furthermore, an interlayer is arranged in the steam condenser and is communicated with the cooling water tank, and the interlayer is used for circulating cooling water in the interlayer to condense the steam discharged from the evaporation tower.

Compared with the prior art, the invention has the beneficial effects that: the evaporation of the feed liquid is completed by heating under vacuum reduced pressure, and the evaporation tower component is cleaned regularly without stopping at the same time, so that the effective evaporation time is ensured, and the evaporation efficiency and the economic benefit are improved.

Drawings

The disclosure of the present invention is illustrated with reference to the accompanying drawings. It is to be understood that the drawings are designed solely for the purposes of illustration and not as a definition of the limits of the invention. In the drawings, like reference numerals are used to refer to like parts. Wherein:

FIG. 1 is a schematic flow chart of an apparatus according to an embodiment of the present invention;

FIG. 2 is a schematic structural component diagram according to an embodiment of the present invention;

FIG. 3 is a schematic top view of a structural component of an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of an evaporation column assembly in an embodiment of the present invention.

Reference numbers in the figures: 1-raw water tank, 2-water return pipeline, 3-spraying pipeline, 4-steam condenser, 5-steam-water separator, 6-vacuum pump, 7-buffer tank, 8-negative pressure water discharger, 9-evaporation tower, 10-spraying pump, 11-support frame, 12-ultrasonic vibration plate, 13-plate heat exchanger, 14-spray header, 15-discharge port, 16-steam inlet pipeline, 17-foam catcher, 18-vibration plate positioning block, 19-steam outlet pipeline, 20-shell, 21-pressure transmitter and 22-water return pump.

Detailed Description

It is easily understood that according to the technical solution of the present invention, a person skilled in the art can propose various alternative structures and implementation ways without changing the spirit of the present invention. Therefore, the following detailed description and the accompanying drawings are merely illustrative of the technical aspects of the present invention, and should not be construed as all of the present invention or as limitations or limitations on the technical aspects of the present invention.

An embodiment according to the present invention is shown in conjunction with fig. 1-4. A self-cleaning plate type falling film evaporation system for industrial wastewater treatment comprises a raw water tank 1 and an evaporation tower 9, wherein a spray pipeline 3 is led out from the raw water tank 1 to the evaporation tower 9, a spray pump 10 is arranged on the spray pipeline 3, the top of the evaporation tower 9 of the spray pipeline 3 extends into the evaporation tower 9, and a spray head 14 is arranged at the tail end of the spray pipeline 3 and used for transferring feed liquid in the raw water tank 1 into the evaporation tower 9 in a spray mode.

The evaporation tower 9 comprises a support and an evaporation tower 9 shell 20 arranged on a support frame 11, a plate heat exchanger 13 is arranged in the evaporation tower 9, the plate heat exchanger 13 is positioned below a spray header 14, and the distance between the plate heat exchanger 13 and the spray header 14 is adjusted, so that feed liquid can be uniformly sprayed on plates of the plate heat exchanger 13. The inner wall of the shell 20 of the evaporation tower 9 is fixed with vibration plate positioning blocks 18, the bracket of each ultrasonic vibration plate 12 is clamped into the clamping groove of the corresponding vibration plate positioning block 18, and the two ultrasonic vibration plates 12 are symmetrically arranged on the inner side of the shell 20 of the evaporation tower 9.

A steam inlet pipeline 16 is arranged above one side of the plate heat exchanger 13, a steam outlet pipeline 19 is symmetrically arranged below the other side of the plate heat exchanger 13, the steam inlet pipeline 16 and the steam outlet pipeline 19 directly penetrate through a shell 20 of the evaporation tower 9 and can be used as a heating source to provide heat for feed liquid in the evaporation tower 9, and steam in the steam can be directly introduced into the atmosphere or recycled to the steam inlet pipeline 16 to participate in next heat exchange after participating in heat exchange.

The feed liquid in the evaporation tower 9 can generate a large amount of secondary steam through the above process, the secondary steam enters the steam condenser 4 through the discharge port 15 which is positioned at the top of the evaporation tower 9 and communicated with the middle pipeline, the evaporation tower 9 is also provided with the foam catcher 17, the foam catcher 17 is positioned in front of the discharge port 15, so the secondary steam entering the steam condenser 4 from the discharge port 15 can firstly go through the foam catcher 17 to remove foam carried in the secondary steam, then the entering secondary steam is condensed by the steam condenser 4, and finally the condensed water is discharged by the negative pressure water discharger 8.

A water return pipeline 2 is also arranged, one end of the water return pipeline 2 is communicated with a liquid return port positioned at the bottom of the evaporation tower 9, the other end of the water return pipeline is connected into the raw water tank 1, and a water return pump 22 is arranged on the water return pipeline 2 and used for pumping out redundant feed liquid in the evaporation tower 9. In order to ensure that the pressure in the evaporation tower 9 is within the allowable range, the material liquid in the evaporation tower 9 should be kept at a certain pressure surface height, so a pressure transmitter 21 is arranged at the liquid return opening, when the material liquid in the evaporation tower 9 is too much, the mechanical strain matrix on the pressure transmitter 21 is stressed to generate stress change, the resistance strain sheet is also deformed together, the resistance value of the strain sheet is changed, so that the voltage applied to the resistance is changed, and the water return pump 22 is sequentially started to pump the redundant material liquid in the evaporation tower 9 back to the raw water tank 1 for recycling evaporation.

The steam condenser 4 is also connected with a steam-water separator 5, a buffer tank 7 and a vacuum pump 6 in sequence, the vacuum pump 6 vacuumizes the evaporation tower 9 through the buffer tank 7 and the steam condenser 4, and the whole system is kept at a certain vacuum degree. Because the whole process is heated in a vacuum decompression environment to finish the evaporation of the feed liquid, the reduction of the vacuum degree of the system can directly destroy the low-temperature evaporation effect and influence the evaporation efficiency of the evaporator; in addition to leakage of the system, scaling of the evaporation tower 9 assembly is another big cause of reduction of the vacuum degree of the evaporation system, and meanwhile, the sealing performance of the evaporator is guaranteed, so that the evaporation tower 9 assembly is cleaned regularly without stopping, the effective evaporation time of the evaporation tower 9 assembly is guaranteed, and the evaporation efficiency and the economic benefit are improved. Therefore, after the self-cleaning plate type falling film evaporation system for industrial wastewater treatment provided by the invention continuously operates for a period of time, as feed liquid may contain some insoluble impurities, partial filter residue is easy to settle at the bottom of the shell 20 of the evaporation tower 9, and in order to avoid that a large amount of filter residue is accumulated to influence the evaporation of the feed liquid, periodic pollution discharge can be realized through the slag discharge port.

The steam condenser 4 is connected with a circulating pipeline, the circulating pipeline is communicated with a cooling water tank, a circulating pump is arranged on the circulating pipeline, an interlayer can be arranged in the steam condenser 4, cooling water at a lower temperature in the cooling water tank can reduce the temperature in the condenser through the interlayer in the steam condenser 4, and secondary steam at a higher temperature in the steam condenser 4 can be conveniently condensed in the evaporation tower 9. The cooling water tank is communicated with the vacuum pump, the cooling water in the cooling water tank is conveyed to the vacuum pump, the purpose of cooling the vacuum pump can be achieved, the cooling water which completes heat exchange is conveyed to the cooling water tank again, and the circulation is carried out.

The invention adopts the ultrasonic cleaning technology to regularly clean the evaporation tower 9 component, after the system sprays and evaporates for a certain time, the backwater pump 22 is closed to ensure that the feed liquid in the shell 20 of the evaporation tower 9 immerses the ultrasonic vibration plate 12, the ultrasonic vibration plate 12 is started to clean the component in the shell 20 of the evaporation tower 9, primary steam is continuously introduced, and at the moment, the plate heat exchanger 13 carries out immersion type boiling evaporation on the feed liquid.

The technical scope of the present invention is not limited to the above description, and those skilled in the art can make various changes and modifications to the above-described embodiments without departing from the technical spirit of the present invention, and such changes and modifications should fall within the protective scope of the present invention.