Equipment for efficiently drying carnallite in coking sewage

Abstract

The utility model discloses equipment for efficiently drying carnallite in coking sewage, which comprises an evaporating tank, a deslagging box and a condensing heat exchanger, a liquid inlet pipe is arranged at the rear end of the evaporating tank, two steam injection pipes are respectively arranged on two side walls of the front end of the evaporating tank, a driving motor is arranged in the middle of the rear end of the evaporating tank, and a rotating shaft is arranged at the output end of the driving motor. An annular baffle is arranged at the position, corresponding to the steam injection pipe, of the rotating shaft, a spiral scraper is fixedly arranged on the rotating shaft located on the front side of the annular baffle, and a plurality of openings are formed in the annular baffle and used for being in butt joint with the steam injection pipe. The heat in the evaporation tank is uniformly distributed, the operation of alternately and intermittently injecting steam in a pulse manner by the two steam injection pipes is realized, the evaporation effect is further improved, the accumulation of condensed water is reduced, the operation efficiency is high, the water outlet effect is good, waste gas pollution, heat pollution and the like are avoided, and a large amount of salt in carnallite sewage can be evaporated and crystallized to be treated as solid waste; the target of efficiently drying the carnallite sewage is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a device for efficiently drying miscellaneous salts in coking sewage. Background Art

[0002] Coking wastewater is produced by recovering byproducts such as tar and benzene during the high-temperature cracking of coal to produce coke and coal gas. Its pollutant composition is highly complex, with high concentrations of organic matter and high toxicity. It is recognized both domestically and internationally as the most polluting and difficult-to-degrade industrial wastewater. Its main sources include: residual ammonia generated during high-temperature coal distillation and raw gas cooling; final gas cooling water and crude benzene separation water generated during gas purification; wastewater generated during crude tar processing, benzene refining, and refined phenol production; and wastewater that has come into contact with substances such as coal and coke dust.

[0003] Coking wastewater has a complex composition and high salt content. Inorganic matter exists in the form of ammonium salts, while organic matter is primarily phenolic compounds. It contains a large number of difficult-to-degrade and toxic substances, posing a threat to aquatic life and humans. Furthermore, the BOD / COD ratio of coking wastewater is approximately 0.3-0.4, indicating poor biodegradability. This makes treatment even more difficult under toxicity suppression conditions.

[0004] Currently, 80% of coking wastewater treatment plants in China generally utilize a coking wastewater process centered around traditional biological denitrification. This process is divided into pretreatment, biochemical treatment, and advanced treatment. Pretreatment primarily utilizes physical and chemical methods, such as oil removal, ammonia distillation, and extractive dephenolization. Biochemical treatment processes primarily include UASB, A / O, and A2 / O. Advanced treatment processes primarily include activated carbon adsorption, activated carbon-biofilm, and oxidation ponds. For the final zero-emission disposal of mother liquor / brine, most companies utilize evaporative crystallization systems or traditional dryers. However, in actual operation, these commonly used evaporative crystallization systems and traditional dryers suffer from low evaporation efficiency and severe condensate accumulation, increasing maintenance costs and difficulty, hindering the efficient drying of mixed salt wastewater. Utility Model Content

[0005] In view of the above-mentioned problems, the utility model provides a device for efficiently drying miscellaneous salts in coking wastewater.

[0006] The technical solution of the utility model is:

[0007] A device for efficiently drying miscellaneous salts in coking wastewater, comprising an evaporation tank, a slag discharge box located at the front end of the evaporation tank, and a condensing heat exchanger located at the top of the evaporation tank;

[0008] A liquid inlet pipe is provided at the rear end of the evaporator, a steam injection pipe is provided on each of the two side walls of the front end of the evaporator, a drive motor is provided in the middle of the rear end of the evaporator, an output end of the drive motor is provided with a rotating shaft that passes through the middle of the evaporator, an annular baffle is provided on the rotating shaft at a position corresponding to the steam injection pipe, a spiral scraper is fixed on the rotating shaft located in front of the annular baffle, and a plurality of openings are provided on the annular baffle for docking with the steam injection pipe.

[0009] Furthermore, the bottom of the condensing heat exchanger is connected to the top of the evaporation tank through a spiral separator.

[0010] Description: The evaporated solid and liquid are separated by a spiral separator, making them easier to collect separately.

[0011] Furthermore, a support leg is provided on each of the front and rear sides of the bottom of the evaporation tank.

[0012] Note: The support legs keep the entire device stable.

[0013] Furthermore, a slag discharge tray is provided at the front end of the evaporation tank, the bottom of the slag discharge tray is fixedly connected to the slag discharge box, and a steam condensation pipe is provided at the front end of the slag discharge tray.

[0014] Note: The steam condensate pipe is used to collect steam condensate.

[0015] Furthermore, the front end of the condensing heat exchanger is connected to the buffer liquid tank via a guide pipe.

[0016] Description: Collects cache fluid via the cache fluid tank.

[0017] Furthermore, the number of the openings is 3 or 5, so that when the annular baffle blocks one of the steam injection pipes, the other steam injection pipe remains in communication with the interior of the evaporation tank.

[0018] Note: By optimizing and adjusting the number of openings, the annular baffle can realize its function without affecting the normal scraping operation of the scraper.

[0019] Furthermore, the interior of the annular baffle is fixedly connected to the rotating shaft via a plurality of connecting rods arranged at equal intervals.

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

[0021] The utility model discloses an apparatus for efficiently drying mixed salts in coking wastewater, which ensures uniform heat distribution inside an evaporation tank by arranging two symmetrical steam injection pipes. At the same time, the steam injection pipes can be alternately blocked and opened by the opening arrangement on the annular baffle, so that the two steam injection pipes can alternately and intermittently pulse-inject steam, thereby further improving the evaporation effect, reducing the accumulation of condensed water, having high operating efficiency, good water discharge effect, and no waste gas pollution, heat pollution, etc. A large amount of salt in mixed salt wastewater can be evaporated and crystallized to be disposed of as solid waste, thereby achieving the goal of efficiently drying mixed salt wastewater. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the overall structure of the front end of a device for efficient drying of miscellaneous salts in coking wastewater according to the present invention;

[0023] Figure 2 This is a schematic diagram of the overall structure of the back end of a device for efficient drying of miscellaneous salts in coking wastewater according to the utility model;

[0024] Figure 3 This is a schematic diagram of the internal structure of a device for efficiently drying miscellaneous salts in coking wastewater according to the utility model;

[0025] Figure 4 This is a schematic diagram of the annular baffle structure in Example 1 of the present utility model;

[0026] Figure 5 This is a schematic diagram of the annular baffle structure in Example 2 of the present utility model.

[0027] Among them, 1-evaporation tank, 11-liquid inlet pipe, 12-steam injection pipe, 13-support leg, 14-slag discharge plate, 15-steam condenser, 2-slag discharge box, 3-condensation heat exchanger, 31-spiral separator, 32-guide pipe, 4-drive motor, 41-rotating shaft, 42-annular baffle, 43-scraper, 44-opening, 45-connecting rod, 5-cache liquid tank. DETAILED DESCRIPTION

[0028] Example 1

[0029] like Figure 1 As shown, a device for efficiently drying miscellaneous salts in coking wastewater includes an evaporation tank 1, a slag box 2 located at the front end of the evaporation tank 1, and a condensing heat exchanger 3 located at the top of the evaporation tank 1. The bottom of the condensing heat exchanger 3 is connected to the top of the evaporation tank 1 via a spiral separator 31. A support leg 13 is provided on each of the front and rear sides of the bottom of the evaporation tank 1. A slag tray 14 is provided at the front end of the evaporation tank 1. The bottom of the slag tray 14 is fixedly connected to the slag box 2. A steam condensing pipe 15 is provided at the front end of the slag tray 14. The front end of the condensing heat exchanger 3 is connected to the buffer liquid tank 5 via a guide pipe 32.

[0030] like Figures 2-4 As shown, a liquid inlet pipe 11 is provided at the rear end of the evaporator 1, and a steam injection pipe 12 is provided on each of the two side walls of the front end of the evaporator 1. A drive motor 4 is provided in the middle of the rear end of the evaporator 1. The drive motor 4 is a commercially available gear reduction motor. The output end of the drive motor 4 is provided with a rotating shaft 41 that passes through the middle of the evaporator 1. An annular baffle 42 is provided on the rotating shaft 41 at a position corresponding to the steam injection pipe 12. A spiral scraper 43 is fixed on the rotating shaft 41 on the front side of the annular baffle 42. A plurality of openings 44 are provided on the annular baffle 42 for docking with the steam injection pipe 12. The number of the openings 44 is 3 or 5, so that when the annular baffle 42 blocks one steam injection pipe 12, the other steam injection pipe 12 remains connected to the interior of the evaporator 1. The interior of the annular baffle 42 is fixedly connected to the rotating shaft 41 through three connecting rods 45 arranged at equal intervals.

[0031] Example 2

[0032] This embodiment differs from embodiment 1 in that:

[0033] like Figure 5 As shown, the interior of the annular baffle 42 is fixedly connected to the rotating shaft 41 via five connecting rods 45 arranged at equal intervals.

[0034] Working principle:

[0035] During use, the coking wastewater containing high-concentration salt is injected into the evaporation tank 1 through the liquid inlet pipe 11, and the steam pump or other equipment connected to the steam injection pipe 12 is turned on to start injecting steam into the evaporation tank 1. At the same time, the drive motor 4 is turned on to drive the rotating shaft 41 to rotate. During the rotation of the rotating shaft 41, the scraper 43 is driven to rotate, thereby scraping the sludge in the coking wastewater forward until the sludge passes through the inspection plate 14 and falls into the slag box 2.

[0036] At the same time, in order to improve the thermal efficiency of steam, enhance the evaporation effect and reduce the accumulation of condensed water, the annular baffle 42 is synchronously driven to rotate during the rotation of the rotating shaft 41. Whenever the opening 44 rotates through one of the steam injection pipes 12, the steam of the steam injection pipe 12 is allowed to flow, while the other steam injection pipe 12 is blocked and sealed by the annular baffle 12, thereby forming an operation in which the two steam injection pipes 12 alternately and intermittently pulse-inject steam.

[0037] Finally, the pH of the coking wastewater containing high concentration salt after being treated by the equipment of the utility model is 7.4, COD is 18.1 mg / L, Cl - The content is 0.8 mg / L, and the residual water content in the evaporation tank 1 is less than 15%, which meets the customer's requirements.

Claims

1. A device for efficiently drying miscellaneous salts in coking wastewater, characterized in that: It comprises an evaporation tank (1), a slag discharge box (2) located at the front end of the evaporation tank (1), and a condensing heat exchanger (3) located at the top of the evaporation tank (1); The rear end of the evaporation tank (1) is provided with a liquid inlet pipe (11), and both side walls of the front end of the evaporation tank (1) are each provided with a steam injection pipe (12). A driving motor (4) is provided in the middle of the rear end of the evaporation tank (1), and the output end of the driving motor (4) is provided with a rotating shaft (41) that passes through the middle of the evaporation tank (1). An annular baffle (42) is provided on the rotating shaft (41) at a position corresponding to the steam injection pipe (12), and a spiral scraper (43) is fixedly provided on the rotating shaft (41) located in front of the annular baffle (42). The annular baffle (42) is provided with a plurality of openings (44) for docking with the steam injection pipe (12).

2. The device for efficiently drying miscellaneous salts in coking wastewater according to claim 1, characterized in that: The bottom of the condensing heat exchanger (3) is connected to the top of the evaporation tank (1) via a spiral separator (31).

3. The device for efficiently drying miscellaneous salts in coking wastewater according to claim 1, characterized in that: A supporting leg (13) is provided on each of the front and rear sides of the bottom of the evaporation tank (1).

4. The device for efficiently drying miscellaneous salts in coking wastewater according to claim 1, characterized in that: A slag discharge tray (14) is provided at the front end of the evaporation tank (1), the bottom of the slag discharge tray (14) is fixedly connected to the slag discharge box (2), and a steam condensation pipe (15) is provided at the front end of the slag discharge tray (14).

5. The device for efficiently drying miscellaneous salts in coking wastewater according to claim 1, characterized in that: The front end of the condensing heat exchanger (3) is connected to the buffer liquid tank (5) via a flow guide pipe (32).

6. The device for efficiently drying miscellaneous salts in coking wastewater according to claim 1, characterized in that: The number of the openings (44) is 3 or 5, so that when the annular baffle (42) blocks one steam injection pipe (12), the other steam injection pipe (12) remains in communication with the interior of the evaporation tank (1).

7. The device for efficiently drying miscellaneous salts in coking wastewater according to claim 1, characterized in that: The interior of the annular baffle (42) is fixedly connected to the rotating shaft (41) via a plurality of connecting rods (45) arranged at equal intervals.

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