A concentrated brine evaporator

Abstract

The present application relates to a kind of concentrated brine evaporator, including evaporation bucket, heating device is arranged in evaporation bucket, exhaust pipe is arranged in the upper portion of evaporation bucket, heating device is heated to concentrated brine in evaporation bucket by vertical heat exchange wall, it further includes scraping device, scraping device is attached with heat exchange wall;Lift rod is vertically arranged in evaporation bucket, and lift rod drives scraping device vertical movement.The concentrated brine evaporator provided in the present application can scrape the crystallization attached on heat exchange wall by the movement of scraping device, to avoid the accumulation of crystallization reduce the heat exchange efficiency of heat exchange wall.

Description

Technical Field

[0001] This invention relates to the field of water treatment, and more specifically to a concentrated brine evaporator. Background Technology

[0002] Generally, the concentrated brine from coking plants after phenol removal, ammonia stripping, biochemical treatment, and reuse has a high salt content. This type of concentrated brine is evaporated and crystallized using an evaporator, and the precipitated crystals are used to produce salt and nitrate products. Current evaporators generally include an evaporation tank, inside which a heating device is installed. The heating device can be a riser or a jacket is installed in the side wall of the evaporation tank, through which a heat source is used to heat the concentrated brine in the evaporation tank. An exhaust pipe is installed at the top of the evaporation tank. The exhaust pipe is connected to the negative pressure equipment and the condenser. Under negative pressure, the concentrated brine is heated to generate steam, which is discharged from the exhaust pipe. The water in the brine is condensed and recovered by the condenser, while the precipitated crystals are discharged from the evaporation tank after evaporation is completed. However, during evaporation, some crystals will always precipitate and adhere to the heating tube or the inner wall of the evaporation tank. When there is a lot of crystal adsorption, it will reduce the heating efficiency and the yield of salt and nitrate products. Summary of the Invention

[0003] To address the problems existing in the above-mentioned technologies, the present invention provides a concentrated brine evaporator, including an evaporation tank, a heating device installed inside the evaporation tank, an exhaust pipe installed at the top of the evaporation tank, and the heating device heating the concentrated brine in the evaporation tank through a vertical heat exchange wall. A scraping device, wherein the scraping device is in contact with the heat exchange wall; A lifting rod is vertically installed inside the evaporation tank, and the lifting rod drives the scraping device to move vertically.

[0004] The top of the lifting rod extends through the top surface of the evaporation tank; The top surface of the evaporation tank is provided with a vertical tube sleeved on the outside of the lifting rod. A container is provided on the top of the lifting rod above the vertical tube. The container has a liquid drainage device. A spring is sleeved on the outside of the lifting rod. The spring is located inside the vertical tube. A magnetic sheet is provided on the top end face of the vertical tube. The magnetic sheet is magnetically attracted to the container. It also includes a condenser connected to the exhaust pipe, and the condensate from the condenser is discharged into the container.

[0005] The drainage device includes an opening in the bottom wall of the container, and a flap hinged to the top surface of the bottom wall of the container to cooperate with the opening. A vertical rod is provided on the top surface of the evaporation tank, and the vertical rod is located below the opening.

[0006] The evaporator has a condensation chamber attached to the top surface of the evaporator, the condenser is located inside the condensation chamber, and a drain pipe is provided on the lower part of the side wall of the condensation chamber.

[0007] The condenser is located above the container, the top of the container is open, and the drain nozzle of the condenser is located above the container.

[0008] The evaporator has a vertical guide rod on its top surface and a vertical guide tube on its bottom surface, with the guide rod slidably disposed within the guide tube.

[0009] The evaporator barrel has a jacket inside its side wall, and the heat exchange wall is the inner wall of the evaporator barrel. The scraping device is a scraping ring, and the outer wall of the scraping ring is in contact with the inner wall of the evaporation tank.

[0010] The heating device is a vertical heating tube, and the side wall of the heating tube is the heat exchange wall. The scraping device is a scraping ring, and the inner wall of the scraping ring is in contact with the outer wall of the heating tube.

[0011] The beneficial effects of the present invention are as follows: The concentrated brine evaporator provided by the present invention can scrape off the crystals attached to the heat exchange wall by the movement of the scraping device, so as to avoid the accumulation of crystals and reduce the heat exchange efficiency of the heat exchange wall. Attached Figure Description

[0012] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0013] Figure 1 This is a schematic diagram of the internal structure of the present invention; Figure 2 This is an enlarged view of the condensation cavity of the present invention.

[0014] Explanation of reference numerals in the attached figures 1. Evaporation tank; 11. Heating element; 12. Lifting rod; 13. Scraper ring; 14. Connecting rod; 2. Condensation chamber; 21. Vertical pipe; 211. Magnetic plate; 22. Container; 221. Flip plate; 23. Vertical rod; 24. Spring; 25. Guide tube; 26. Guide rod; 27. Drain pipe; 3. Condenser; 31. Negative pressure pipe; 4. Exhaust pipe. Detailed Implementation

[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0016] like Figure 1 , Figure 2 As shown in the embodiment, a concentrated brine evaporator includes an evaporation tank 1, a heating device is installed inside the evaporation tank 1, and an exhaust pipe 4 is installed on the upper part of the evaporation tank 1. The heating device is used to heat the concentrated brine in the evaporation tank 1, and the concentrated brine generates steam when heated and is discharged from the exhaust pipe 4. The heating device exchanges heat with the concentrated brine in the evaporation tank 1 through a vertical heat exchange wall. The scraping device is attached to the heat exchange wall and is used to scrape off the crystals on the heat exchange wall. Specifically, in this embodiment, the heating device is a vertical heating tube 11, the side wall of the heating tube 11 is a heat exchange wall, and the heating tube 11 can be an electric heating tube or a vertically arranged heat exchange tube. The scraping device has a scraping ring 13, the inner wall of which is in contact with the outer wall of the heating tube.

[0017] Alternatively, in other embodiments, a jacket is provided inside the side wall of the evaporator 1, and the heat exchange wall is the inner wall of the evaporator 1; the scraping device is a scraper ring 13, and the outer wall of the scraper ring 13 is in contact with the inner wall of the evaporator 1.

[0018] It also includes a lifting rod 12 vertically installed inside the evaporation tank 1, which drives the scraper ring 13 to move vertically through the connecting rod 14.

[0019] Furthermore, the top of the lifting rod 12 extends through the top surface of the evaporation tank 1 and into the condensation chamber 2 located above the evaporation tank 1. A condenser 3 is installed in the condensation chamber 2, and a drain pipe 27 is installed on the lower part of the side wall of the condensation chamber 2. The lifting rod 12 is slidably and sealed to the top surface of the evaporation tank 1. The condenser 3 can be a plate condenser, which includes an outer shell. A condensing plate with cooling water is installed inside the outer shell. The exhaust pipe 4 sends steam into the condenser 3 to condense the water. The condensate is discharged through the drain nozzle at the bottom of the outer shell. The dehydrated gas is extracted by the negative pressure pipe 31 connected to the negative pressure device. This is the prior art and will not be described in detail.

[0020] An evaporation tank 1 has a vertical tube 21 sleeved on the outside of a lifting rod 12 on its top surface. A container 22 is located above the vertical tube 21 on the top of the lifting rod 12. The container 22 has a draining device. A spring 24 is sleeved on the outside of the lifting rod 12. The spring 24 is located inside the vertical tube 21. A magnetic sheet 211 is provided on the top end face of the vertical tube 21. The magnetic sheet 211 is magnetically attracted to the bottom surface of the container 22. The condenser 3 is connected to the end of the exhaust pipe 4. The condenser 3 is located above the container 22. The top surface of the container 22 is open. The drain nozzle of the condenser 3 is located above the container 22 so that the condensate is discharged into the container 22.

[0021] The draining device includes an opening on the bottom wall of container 22, and a flap 221 that is hinged to the top surface of the bottom wall of container 22 at the edge of the opening and engages with the opening. The flap 221 can be flipped upward. A vertical rod 23 is installed on the top surface of the evaporator 1. The vertical rod 23 is located below the opening and is used to lift the flap 221.

[0022] A vertical guide rod 26 is provided on the top surface of the evaporator 1, and a vertical guide tube 25 is provided on the bottom surface of the container 22. The guide rod 26 is slidably disposed in the guide tube 25 to guide the vertical movement of the container 22.

[0023] When in use, the spring 24 lifts the container 22, preventing the container 22 from being attracted to the magnetic sheet 211. The flap 211 closes the opening under the action of gravity, and the drain pipe 27 is closed. Then concentrated brine is fed into the evaporation tank 1 and heated through the heating tube 11. The negative pressure device provides negative pressure to the evaporation tank 1 through the negative pressure tube 31, the condenser 3 and the exhaust pipe 4. As the concentrated brine evaporates, crystals gradually precipitate out. During this process, some crystals adhere to the heat exchange wall of the heating tube 11. The steam discharged from the exhaust pipe 4 is condensed by the condenser 3, and the resulting condensate is discharged into the container 22 and gradually accumulates, making the container 22 heavier and gradually moving downwards. This causes the scraper ring 13 to move downwards and scrape off the crystals on the outer wall of the heating tube 11. As container 22 moves downward, the bottom surface of container 22 moves into the adsorption range of magnetic sheet 211 and is adsorbed. At this time, vertical rod 23 lifts flap 221, and the condensate in container 22 falls from the opening to the bottom of condensation chamber 2. When necessary, drain pipe 27 can be opened to drain the condensate. As the condensate in container 22 is gradually drained, its weight gradually decreases. When the total weight of container 22, the water inside, lifting rod 12, scraper ring 13, and connecting rod 14, plus the attraction force of magnetic plate 211, is less than the elastic force of spring 24, container 22 breaks free from magnetic plate 211, causing lifting rod 22 to rise rapidly, which in turn causes scraper ring 13 to rise and scrape off the crystals on the outer wall of heating tube 11 again. At the same time, flap 211 closes, allowing water to accumulate in container 22 again. The rapid rise of container 22 after breaking free can also shake off some of the crystals on hanging ring 13, connecting rod 14, and lifting rod 12.

[0024] Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

Claims

1. A concentrated brine evaporator, comprising an evaporation tank, wherein a heating device is disposed inside the evaporation tank, and an exhaust pipe is disposed at the top of the evaporation tank, characterized in that, The heating device heats the concentrated brine in the evaporation tank through a vertical heat exchange wall, and also includes... A scraping device, wherein the scraping device is in contact with the heat exchange wall; A lifting rod is vertically installed inside the evaporation tank. The lifting rod drives the scraping device to move vertically, and the top of the lifting rod protrudes through the top surface of the evaporation tank. The top surface of the evaporation tank is provided with a vertical tube sleeved on the outside of the lifting rod. A container is provided on the top of the lifting rod above the vertical tube. The container has a liquid drainage device. A spring is sleeved on the outside of the lifting rod. The spring is located inside the vertical tube. A magnetic sheet is provided on the top end face of the vertical tube. The magnetic sheet is magnetically attracted to the container. It also includes a condenser connected to the exhaust pipe, and the condensate from the condenser is discharged into the container; The drainage device includes an opening provided in the bottom wall of the container, and a flap hinged to the top surface of the bottom wall of the container to cooperate with the opening; A vertical rod is provided on the top surface of the evaporation tank, and the vertical rod is located below the opening; A jacket is provided inside the side wall of the evaporator, and the heat exchange wall is the inner wall of the evaporator; The scraping device is a scraping ring, and the outer wall of the scraping ring is in contact with the inner wall of the evaporation tank; The heating device is a vertical heating tube, and the side wall of the heating tube is the heat exchange wall; The scraping device is a scraping ring, and the inner wall of the scraping ring is in contact with the outer wall of the heating tube.

2. The concentrated brine evaporator according to claim 1, characterized in that, A condensation chamber is attached to the top surface of the evaporation tank, and the condenser is located inside the condensation chamber. A drain pipe is provided on the lower part of the side wall of the condensation chamber.

3. A concentrated brine evaporator according to claim 2, characterized in that, The condenser is located above the container, the top of the container is open, and the drain nozzle of the condenser is located above the container.

4. A concentrated brine evaporator according to any one of claims 1 to 3, characterized in that, A vertical guide rod is provided on the top surface of the evaporation tank, and a vertical guide tube is provided on the bottom surface of the container. The guide rod is slidably disposed inside the guide tube.

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