Ammonia still capable of efficiently desulfurizing

Abstract

The ammonia still comprises a tower body, the tower body is divided into an upper chamber, a middle chamber and a lower chamber in sequence from top to bottom through partition plates, a heat exchanger is arranged in the lower chamber, a double-layer jacket cavity is arranged in the lower chamber, and the upper chamber and the lower chamber are communicated with each other. A hot water inlet pipe and a hot water outlet pipe are arranged on the side, relative to the lower chamber, of the heat exchanger, a spraying device is arranged in the middle chamber and used for spraying desulfurization slurry to the lower chamber, an ammonia water inlet pipe is arranged on one side of the middle chamber, and a three-stage demister is arranged in the upper chamber and used for spraying desulfurization slurry to the lower chamber. The three-stage demister is composed of three groups of demisters which are uniformly distributed in the vertical direction in parallel. The utility model belongs to the technical field of ammonia stilling towers, and particularly provides an efficient desulfurization ammonia stilling tower, which utilizes a heat exchanger to perform ammonia stilling operation, adopts multiple spray devices to improve the desulfurization effect, utilizes multiple demisters to improve the flue gas purification quality, and utilizes an external heating device to further improve the desulfurization effect.

Description

Technical Field

[0001] The utility model belongs to the technical field of ammonia distillation towers, and specifically refers to an ammonia distillation tower with high-efficiency desulfurization. Background Technique

[0002] Ammonia distillation is to distill the chemical separation wastewater and surplus ammonia water generated in the coking process. After ammonia distillation treatment, the content of NH 3 -N is reduced, which is a necessary pretreatment for the next biochemical treatment.

[0003] The spray tower in the desulfurization tower is one of the most widely used types of desulfurization towers. The spray tower has the advantages of simple structure and mature and reliable process, and is widely used in the treatment of low-sulfur sulfide gases in large, medium and small power plants. However, it is very difficult to achieve ultra-low emissions of sulfur dioxide only by the single-stage desulfurization of the spray tower itself, and the desulfurization efficiency is also not satisfactory. Content of the Utility Model

[0004] In view of the above situation, in order to overcome the defects of the prior art, the utility model provides an ammonia distillation tower with high-efficiency desulfurization, which is used to solve the problems of low single-stage desulfurization efficiency and poor desulfurization effect in the prior art.

[0005] The technical solution adopted in this application is as follows:

[0006] This solution provides an ammonia distillation tower with high-efficiency desulfurization, including a tower body; the tower body is divided into an upper chamber, a middle chamber and a lower chamber from top to bottom by a partition board;

[0007] A heat exchanger is arranged in the lower chamber, a double-layer jacket cavity is arranged in the lower chamber, and a hot water inlet pipe and a hot water outlet pipe are respectively arranged on one side of the heat exchanger with respect to the lower chamber;

[0008] A spray device is arranged in the middle chamber, and the spray device is used to spray desulfurization slurry downward into the lower chamber to absorb sulfur dioxide in the flue gas; an ammonia water inlet pipe is arranged on one side of the middle chamber, and the ammonia water inlet pipe is arranged below the spray device; a wastewater discharge pipe is also arranged on one side of the lower chamber;

[0009] A three-stage demister is arranged in the upper chamber, and the three-stage demister is composed of three groups of demisters arranged in parallel and evenly distributed vertically. The three-stage demister is used to remove the mist inside the flue gas, which can not only improve the efficiency of flue gas demisting, but also improve the quality of flue gas purification.

[0010] As a preferred solution, an exhaust pipe is arranged at the outer top of the upper chamber, and a heating device is also arranged at the exhaust pipe. The heating device is composed of a heating chamber and a heating pipe wound around the outside of the heating chamber.

[0011] Further, the spraying device includes a liquid distribution pipe, a liquid spraying hood is connected and arranged at the bottom of the liquid distribution pipe, a plurality of nozzles are uniformly distributed along the axial direction at the bottom of the liquid spraying hood, the other end of the liquid distribution pipe extends to the outside of the tower body, and the liquid distribution pipe is used for connecting desulfurization slurry.

[0012] In a preferred solution, the desulfurization slurry is limestone slurry, and the limestone slurry is sprayed on the flue gas to absorb sulfur dioxide in the flue gas.

[0013] As a further elaborated solution, multiple groups of the spraying devices can be arranged in the middle chamber to form a multiple spraying structure, so that the desulfurization effect is more sufficient.

[0014] The beneficial effects achieved by the present utility model with the above structure are as follows:

[0015] The ammonia distillation operation is carried out by using a heat exchanger, the desulfurization effect is improved by using a spraying device with multiple settings, the quality of flue gas purification is improved by using multiple demisters, and the desulfurization effect is further improved by using a heating device arranged outside. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of an ammonia distillation tower for efficient desulfurization provided by this solution;

[0017] Figure 2 It is a schematic diagram of the internal structure of this solution;

[0018] Figure 3 It is a schematic diagram of another embodiment provided by this solution.

[0019] The meanings of the reference numerals in the drawings are as follows:

[0020] 1. Tower body, 2. Heat exchanger, 3. Spraying device, 4. Demister, 5. Heating device, 6. Ammonia water inlet pipe, 7. Waste water discharge pipe;

[0021] 11. Upper chamber, 12. Middle chamber, 13. Lower chamber;

[0022] 21. Hot water inlet pipe, 22. Hot water outlet pipe;

[0023] 31. Liquid distribution pipe, 32. Liquid spraying hood, 33. Nozzle;

[0024] 51. Heating chamber, 52. Heating pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model.

[0026] Embodiment 1

[0027] Please refer to Figures 1 - 3 As shown, this embodiment provides an ammonia distillation tower for efficient desulfurization, including a tower body 1. The tower body 1 is divided into an upper chamber 11, a middle chamber 12, and a lower chamber 13 from top to bottom by a partition plate.

[0028] The introduction is made from the bottom of the tower body 1 upwards with reference to the drawings:

[0029] Among them, a heat exchanger 2 is arranged in the lower chamber 13. A double-layer jacket cavity is arranged in the lower chamber 13. A hot water inlet pipe 21 and a hot water outlet pipe 22 are respectively arranged on one side of the heat exchanger 2 with respect to the lower chamber 13. The inlet temperature of the hot water inlet pipe 21 is adjusted as required.

[0030] A spraying device 3 is arranged in the middle chamber 12. The spraying device 3 is used to spray desulfurization slurry downward into the lower chamber 13 to absorb sulfur dioxide in the flue gas. An ammonia water inlet pipe 6 is opened on one side of the middle chamber 12, and the ammonia water inlet pipe 6 is arranged below the spraying device 3.

[0031] Among them, the spraying device 3 includes a liquid distribution pipe 31. A liquid spraying hood 32 is connected and arranged at the bottom of the liquid distribution pipe 31. A plurality of nozzles 33 are uniformly distributed along the axial direction at the bottom of the liquid spraying hood 32. The other end of the liquid distribution pipe 31 extends out of the tower body 1, and the liquid distribution pipe 31 is used to connect to the desulfurization slurry. The desulfurization slurry uses limestone slurry, and the limestone slurry is sprayed on the flue gas to absorb sulfur dioxide in the flue gas.

[0032] A three-stage demister 4 is arranged in the upper chamber 11. The three-stage demister 4 is composed of three groups of demisters 4 arranged uniformly in the vertical direction in parallel. The three-stage demister 4 is used to remove the mist inside the flue gas, which can not only improve the efficiency of flue gas demisting, but also improve the quality of flue gas purification.

[0033] An exhaust pipe is opened at the outer top of the upper chamber 11, and a heating device 5 is also arranged at the exhaust pipe. The heating device 5 is composed of a heating cavity 51 and a heating pipe 52 wound around the outside of the heating cavity 51 in a fitting manner.

[0034] As another embodiment:

[0035] Multiple groups of the spraying device 3 can be arranged in the middle chamber 12 to form a multiple spraying structure, so that the desulfurization effect is more sufficient.

[0036] When using the present utility model, ammonia water enters the tower body 1 through the ammonia water inlet pipe 6. The heat exchanger 2 provides heat exchange at 102 - 105 °C to heat the ammonia water to about 90 °C. By increasing the temperature of the ammonia water, the solubility of ammonia in water is reduced to realize the distillation of ammonia water.

[0037] In the embodiment, a waste water discharge pipe 7 is also opened on one side of the lower chamber 13, and a drain valve is arranged at the waste water drain pipe.

[0038] First, close the drain valve. When the liquid level at the bottom of the tower body 1 reaches 2 / 3, increase the inlet water temperature of the heat exchanger 2 and adjust the steam-ammonia ratio to reach 220 - 240 kg / m 3 ammonia water, so that the ammonia gas in the ammonia water continuously evaporates, and substances such as ammonia, carbon dioxide, and hydrogen sulfide in the ammonia water gradually enter the gas as the steam rises. Then, in cooperation with the multiple spray devices 3 installed at the top, limestone slurry is sprayed on the flue gas to absorb sulfur dioxide in the flue gas, achieving an efficient desulfurization effect.

[0039] As a result, the ammonia content in the bottom waste liquid is reduced and reaches the specified standard, and then the drain valve is opened to send the ammonia water to the sewage treatment station.

[0040] At the same time, the gas continues to move upward. The three-stage demister 4 located in the upper chamber 11 at the top is used to remove the mist inside the flue gas, which can not only improve the efficiency of flue gas demisting but also improve the quality of flue gas purification. Subsequently, through the heating device 5, the desulfurization effect is further enhanced by providing the temperature conditions.

[0041] It should be noted that although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, without departing from the gist of the present invention, any structural forms and embodiments designed without creativity and similar to the technical solution shall fall within the protection scope of the present invention.

Claims

1. An ammonia still for efficient desulfurization, comprising a tower body, wherein the tower body is divided into an upper chamber, a middle chamber and a lower chamber from top to bottom by a partition plate, characterized in that: A heat exchanger is arranged in the lower chamber, a double-layer jacket cavity is arranged in the lower chamber, and a hot water inlet pipe and a hot water outlet pipe are respectively arranged on one side of the heat exchanger relative to the lower chamber; A spray device is arranged in the middle chamber, and the spray device is used to spray desulfurization slurry to the lower chamber below to absorb sulfur dioxide in the flue gas; an ammonia water inlet pipe is opened on one side of the middle chamber; A three-stage demister is arranged in the upper chamber. The three-stage demister is composed of three groups of demisters evenly distributed vertically and arranged in parallel. The three-stage demister is used to improve the efficiency of demisting.

2. The ammonia still for efficient desulfurization according to claim 1, characterized in that: An exhaust pipe is provided on the outer top of the upper chamber, and a heating device is also provided at the exhaust pipe. The heating device is composed of a heating chamber and a heating pipe which is fitted and wound around the outside of the heating chamber.

3. The ammonia still for efficient desulfurization according to claim 1, characterized in that: The spray device includes a liquid distribution pipe, the bottom of which is connected to a liquid spray hood, and the bottom of the liquid spray hood is evenly distributed with multiple nozzles along the axial direction. The other end of the liquid distribution pipe extends to the outside of the tower body, and the liquid distribution pipe is used to connect the desulfurization slurry.

4. The ammonia still for efficient desulfurization according to claim 3, characterized in that: The desulfurization slurry adopts limestone slurry, which is sprayed on ammonia water and ammonia gas to absorb sulfur dioxide.

5. The ammonia still for efficient desulfurization according to claim 1, characterized in that: The spraying device can be arranged in multiple groups in the middle chamber to form a multiple spraying structure.

6. The ammonia still for efficient desulfurization according to claim 3, characterized in that: The ammonia water inlet pipe is arranged below the nozzle, and a wastewater discharge pipe is also opened on one side of the lower chamber.

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