Equipment for distilling ammonia by using waste heat of coke oven flue gas

Abstract

The utility model relates to equipment for distilling ammonia by using coke oven flue gas waste heat, which comprises an ammonia distillation tower, the middle part of one side of the ammonia distillation tower is connected with a reboiler through a pipeline 8, the bottom of the other side of the ammonia distillation tower is connected with a secondary heating machine through a pipeline 11, the secondary heating machine is connected with an exhaust chimney through a pipeline 10, and the exhaust chimney is connected with an exhaust fan through a pipeline 12. A ninth pipeline is arranged on the exhaust chimney and extends into the heat exchange plate, and a heat recovery cavity is formed in an inner cavity of the heat exchange plate. The position movement of the movable sleeve is limited through the fixing block, the connecting ring is controlled to drive the movable sleeve to move up and down, and the scraper keeps contact with the main heat absorption face of the heat exchange plate, so that the scraper can shovel solid attachments on the outer side of the heat exchange plate. And solid attachments on the outer side of the heat exchange plate can be efficiently removed, so that the heat exchange capability of the device is recovered.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of waste heat ammonia evaporation, and particularly relates to a device for evaporating ammonia by using coke oven flue gas waste heat. BACKGROUND

[0002] Ammonia evaporation is a method for treating high ammonia-nitrogen wastewater and is mainly used for treating coking wastewater. Ammonia-nitrogen organic pollutants are contained in ammonia evaporation wastewater, which is usually treated by an ammonia evaporation tower. The ammonia evaporation tower utilizes the saturated vapor pressure principle to release ammonia-nitrogen in wastewater by heating. When ammonia is evaporated by using coke oven flue gas waste heat, flue gas particles are easily attached to the surface of a heat exchange structure, thereby reducing the heat exchange efficiency. Therefore, the device for evaporating ammonia by using coke oven flue gas waste heat is provided. CONTENT OF THE UTILITY MODEL

[0003] This section aims to summarize some aspects of the embodiments of the application and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract and title of the specification to avoid obscuring the purpose of this section, the abstract and the title, and such simplifications or omissions cannot be used to limit the scope of the application.

[0004] In view of the following technical problems in the prior art: when ammonia is evaporated by using coke oven flue gas waste heat, flue gas particles are easily attached to the surface of a heat exchange structure, thereby reducing the heat exchange efficiency.

[0005] To solve the above technical problems, the application provides the following technical solutions: a device for evaporating ammonia by using coke oven flue gas waste heat, comprising an ammonia evaporation tower, the middle part of one side of the ammonia evaporation tower is connected to a reboiler through a pipeline eight, the bottom of the other side of the ammonia evaporation tower is connected to a pipeline six through a pipeline eleven, the pipeline six is connected to an exhaust chimney through a pipeline ten, a pipeline nine is arranged on the exhaust chimney, the pipeline nine extends into a heat exchange plate, and a heat recovery cavity is formed in the inner cavity of the heat exchange plate; a cavity is arranged in the reboiler, and an electric heating wire is arranged in the cavity to heat ammonia water again to make it gasify.

[0006] As a preferred technical solution of the device for evaporating ammonia by using coke oven flue gas waste heat, a structure cylinder is arranged on the inner side of the heat recovery cavity, a plurality of heat absorption assemblies are arranged on the inner side of the structure cylinder, the heat absorption assembly comprises four heat exchange plates, a plurality of heat conduction pipes parallel to each other are arranged in the heat exchange plate, one end of the heat conduction pipe is connected to a water supply pipe through a main pipeline, the other end of the heat conduction pipe is connected to a pipeline two through the main pipeline, and a scraping assembly is movably connected to the heat exchange plate; the scraping assembly comprises a movable sleeve, a connecting plate and a scraper, the movable sleeve is slidably connected to the heat exchange plate, two connecting plates are symmetrically arranged on the movable sleeve, the scraper is arranged on the connecting plate, and the scraper is movably connected to the heat exchange plate.

[0007] As a kind of preferred technical scheme of the equipment for utilizing coke oven flue gas waste heat to steam ammonia, the upper portion of the ammonia tower is provided with pipeline fourteen, and pipeline fourteen supplies ammonia water.

[0008] The top of the pipeline six is smaller than the bottom, the pipeline six is arranged in the pipeline three, the top of the pipeline three is provided with a smoke exhaust pipe, and the bottom of the inner cavity of the pipeline three is provided with a gas stove;The flame generated by the gas stove can secondary heat the water vapor in the secondary heating machine.

[0009] As a kind of preferred technical scheme of the equipment for utilizing coke oven flue gas waste heat to steam ammonia, the bottom of the ammonia tower is provided with pipeline twelve, and the bottom of the ammonia tower is provided with pipeline thirteen;Pipeline twelve can remove ammonia wastewater, and pipeline thirteen can remove asphalt residue.

[0010] The top of the structure cylinder is sleeved with a sealing ring, and the sealing ring is connected with the inner side of the heat exchange plate;The sealing ring can close the gap between the structure cylinder and the heat exchange plate.

[0011] As a kind of preferred technical scheme of the equipment for utilizing coke oven flue gas waste heat to steam ammonia, the middle part of the ammonia tower is connected with the top end of the reboiler through pipeline seven, and the middle part of the ammonia tower is connected with the bottom of the reboiler through pipeline one;Pipeline one can transport ammonia water in the ammonia tower into the reboiler.

[0012] The bottom of the reboiler is provided with pipeline five, the top end of the heat exchange plate is provided with a limiting seat, the top end of the limiting seat is provided with a groove, the top end of the structure cylinder is provided with a limiting column, and the limiting column is sleeved with the groove;The limiting column and the groove make the structure cylinder fixed.

[0013] As a kind of preferred technical scheme of the equipment for utilizing coke oven flue gas waste heat to steam ammonia, the connecting ring is connected with the movable sleeve through the connecting arm, the bottom of the heat exchange plate is provided with a fixed block, and the fixed block is movably connected with the movable sleeve;The fixed block limits the position movement of the movable sleeve, and by controlling the up-down movement of the connecting ring with the movable sleeve, the scraper can remove the solid adhering matter outside the heat exchange plate.

[0014] The connecting arm is made of elastic material, and the connecting arm includes high-temperature-resistant spring.

[0015] As a kind of preferred technical scheme of the equipment for utilizing coke oven flue gas waste heat to steam ammonia, the bottom end of the water supply pipe is provided with a water pump, the water pump can extract water liquid to be transported through the water supply pipe, and the top end of the ammonia tower is provided with an exhaust pipe.

[0016] The device for ammonia evaporation by using coke oven flue gas waste heat has the beneficial effects that the position movement of the movable sleeve is limited by the fixed block, the movable sleeve is moved up and down by controlling the connecting ring, the main heat absorbing surface of the scraper and the heat exchange plate is kept in contact, the scraper can shovel the solid adhesion outside the heat exchange plate, the solid adhesion outside the heat exchange plate can be efficiently removed by the cooperation of the scraper and the heat exchange plate, and the heat exchange capacity of the device is restored. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor. Among them:

[0018] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0019] Figure 2 It is a schematic diagram of the internal structure of the present application;

[0020] Figure 3 It is a schematic diagram of the position relationship of the present application;

[0021] Figure 4 It is a schematic diagram of the position relationship of the present application Figure 2 and the local enlarged structure of part A;

[0022] Figure 5 It is a schematic diagram of the local enlarged structure of part B of the present application Figure 2

[0023] Figure 6 It is a schematic diagram of the position relationship structure of the present application and

[0024] Figure 7 It is a schematic diagram of the internal structure of the present application.

[0025] Reference signs: 1, ammonia evaporation tower; 2, reboiler; 3, secondary heating machine; 4, exhaust chimney; 5, water supply pipe; 6, pipeline one; 7, pipeline two; 8, pipeline three; 9, pipeline four; 10, pipeline five; 11, pipeline six; 12, pipeline seven; 13, pipeline eight; 14, pipeline nine; 15, pipeline ten; 16, heat exchange plate; 17, heat conducting pipe; 18, connecting arm; 19, movable sleeve; 20, connecting ring; 21, main pipeline; 22, fixed block; 23, structure cylinder; 24, sealing ring; 25, connecting plate; 26, scraper; 27, limiting column; 28, limiting seat; 29, groove; 30, pipeline eleven; 31, pipeline twelve; 32, pipeline thirteen; 33, pipeline fourteen. DETAILED DESCRIPTION​

[0026] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0027] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0028] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0029] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0030] like Figures 1-7 As shown, the present invention proposes a device for ammonia stripping using waste heat from coke oven flue gas, including an ammonia stripping tower 1. The middle part of one side of the ammonia stripping tower 1 is connected to a reboiler 2 through a pipe 8 13. The bottom of the other side of the ammonia stripping tower 1 is connected to a pipe 6 11 through a pipe 11 30. The pipe 6 11 is connected to an exhaust chimney 4 through a pipe 10 10. A pipe 9 is provided on the exhaust chimney 4. The pipe 9 9 extends into a heat exchange plate 16. A heat recovery chamber is opened in the inner cavity of the heat exchange plate 16.

[0031] The reboiler 2 is equipped with a cavity containing a heating wire, which can reheat the ammonia water to vaporize it.

[0032] The inside of the heat recovery cavity is provided with a structure cylinder 23, the inside of the structure cylinder 23 is provided with a plurality of groups of heat absorption components, the heat absorption components include four heat exchange plates 16, the inside of the heat exchange plate 16 is provided with a plurality of mutually parallel heat conduction pipes 17, one end of the heat conduction pipe 17 is connected with the water supply pipe 5 through the main pipe 21, the other end of the heat conduction pipe 17 is connected with the pipe two 7 through the main pipe 21, the heat exchange plate 16 is movably connected with a scraping component; the scraping component includes a movable sleeve 19, a connecting plate 25 and a scraper 26, the heat exchange plate 16 is slidably connected with the movable sleeve 19, the movable sleeve 19 is symmetrically provided with two connecting plates 25, the connecting plate 25 is provided with the scraper 26, and the scraper 26 is movably connected with the heat exchange plate 16.

[0033] The upper part of the ammonia distillation tower 1 is provided with a pipe fourteen 33, and the pipe fourteen 33 supplies ammonia water.

[0034] The top of the pipe six 11 is smaller than the bottom, the pipe six 11 is arranged in the pipe three 8, the top of the pipe three 8 is provided with a smoke exhaust pipe, and the bottom of the inner cavity of the pipe three 8 is provided with a gas stove; the gas stove generates flame to perform secondary heating on the water vapor in the secondary heating machine 31.

[0035] The bottom of the ammonia distillation tower 1 is provided with a pipe twelve 31, and the bottom end of the ammonia distillation tower 1 is provided with a pipe thirteen 32; the pipe twelve 31 can discharge ammonia distillation wastewater, and the pipe thirteen 32 can discharge asphalt residue.

[0036] The top of the structure cylinder 23 is sleeved with a sealing ring 24, and the sealing ring 24 is connected with the inside of the heat exchange plate 16; the sealing ring 24 can close the gap between the structure cylinder 23 and the heat exchange plate 16.

[0037] The middle part of the ammonia distillation tower 1 is connected with the top end of the reboiler 2 through a pipe seven 12, and the middle part of the ammonia distillation tower 1 is connected with the bottom of the reboiler 2 through a pipe one 6; the pipe one 6 can transport the ammonia water in the ammonia distillation tower 1 into the reboiler 2.

[0038] The bottom of the reboiler 2 is provided with a pipe five 15, the top end of the heat exchange plate 16 is provided with a limiting seat 28, the top end of the limiting seat 28 is provided with a groove 29, the top end of the structure cylinder 23 is provided with a limiting column 27, and the limiting column 27 is sleeved with the groove 29; the limiting column 27 and the groove 29 fix the structure cylinder 23.

[0039] The periphery of the connecting ring 20 is connected with the movable sleeve 19 through the connecting arm 18, the bottom of the heat exchange plate 16 is provided with a fixed block 22, and the fixed block 22 movably abuts against the movable sleeve 19; the fixed block 22 limits the position movement of the movable sleeve 19, the movable sleeve 19 moves up and down by controlling the connecting ring 20, so that the scraper 26 can shovel off the solid attachments on the outside of the heat exchange plate 16.

[0040] The connecting arm 18 is made of elastic material, and the connecting arm 18 comprises a high-temperature-resistant spring.

[0041] The bottom end of the water supply pipe 5 is provided with a water pump, and the water pump can extract water to be delivered through the water supply pipe 5. The top end of the ammonia distillation tower 1 is provided with an exhaust pipe.

[0042] The coke oven flue gas passes through the inner cavity of the exhaust chimney 4, and during the process: when the heat of the coke oven flue gas passes through the surface of the heat exchange plate 16, the heat is transferred to the heat exchange plate 16 and the heat conduction pipe 17 in the heat exchange plate 16, so that the water in the heat conduction pipe 17 is heated. The heated water and steam enter the secondary heating machine 3 through the pipeline ten 10, and are heated by the secondary heating machine 3. All the converted water vapor enters the ammonia distillation tower 1 through the pipeline eleven 30, and the ammonia gas dissolved in the circulating water is released by the heat transfer of the heat carrier.

[0043] It should be understood that during the development of any actual implementation, numerous implementation-specific decisions can be made. Such development efforts, while possibly complex and time-consuming, would nevertheless be routine undertaking for those of ordinary skill in the art having the benefit of this disclosure, and would not require undue experimentation to generate.

[0044] It should be noted that the above examples are only used to illustrate the technical solutions of the present application, but not limit the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalent, without departing from the spirit and scope of the technical solutions of the present application, which should be covered in the scope of the claims of the present application.

Claims

1. An apparatus for ammonia evaporation using coke oven flue gas waste heat, characterized by: The application relates to a heat recovery device for an ammonia distillation tower. The heat recovery device comprises an ammonia distillation tower (1), a reboiler (2) connected to the middle of one side of the ammonia distillation tower (1) through a pipeline No.8 (13), a pipeline No.6 (11) connected to the bottom of the other side of the ammonia distillation tower (1) through a pipeline No.11 (30), the pipeline No.6 (11) connected to a pipeline No.2 (7) through a pipeline No.10 (10), a pipeline No.9 (9) arranged on the pipeline No.2 (7) and extending into an exhaust chimney (4), a heat recovery cavity formed in the inner cavity of the exhaust chimney (4), a structure cylinder (23) arranged on the inner side of the heat recovery cavity, a plurality of heat absorption assemblies arranged on the inner side of the structure cylinder (23), each heat absorption assembly comprising four heat exchange plates (16), a plurality of heat conduction pipes (17) arranged in the heat exchange plates (16) and parallel to each other, one end of each heat conduction pipe (17) connected to the pipeline No.9 (9) through a main pipeline (21), the other end of each heat conduction pipe (17) connected to a pipeline No.3 (8) through the main pipeline (21), and a scraping assembly movably connected to the heat exchange plates (16).

2. The apparatus for ammonia evaporation using coke oven flue gas waste heat according to claim 1, characterized in that: The scraping assembly comprises a movable sleeve (19) slidably connected to the heat exchange plates (16), two connecting plates (25) symmetrically arranged on the movable sleeve (19), a scraper (26) arranged on each connecting plate (25) and movably connected to the heat exchange plates (16), and the top of the pipeline No.6 (11) smaller than the bottom. The pipeline No.6 (11) is arranged in a secondary heating machine (3), and an exhaust pipeline is arranged on the top of the secondary heating machine (3).

3. The apparatus for ammonia evaporation using coke oven flue gas waste heat according to claim 1, characterized in that: A pipeline No.12 (31) is arranged on the bottom of the ammonia distillation tower (1), and a pipeline No.13 (32) is arranged on the bottom end of the ammonia distillation tower (1).

4. The apparatus for ammonia evaporation using coke oven flue gas waste heat according to claim 1, characterized in that: A sealing ring (24) is arranged on the top of the structure cylinder (23), and the sealing ring (24) is connected to the inner side of the exhaust chimney (4).

5. The apparatus for ammonia evaporation using coke oven flue gas waste heat according to claim 1, characterized in that: A pipeline No.7 (12) is arranged between the middle of the ammonia distillation tower (1) and the top end of the reboiler (2), and a pipeline No.1 (6) is arranged between the middle of the ammonia distillation tower (1) and the bottom of the reboiler (2).

6. The apparatus for ammonia evaporation using coke oven flue gas waste heat according to claim 1, characterized in that: A pipeline No.5 (15) is arranged on the bottom of the reboiler (2), a limiting seat (28) is arranged on the top end of the exhaust chimney (4), a groove (29) is arranged on the top end of the limiting seat (28), a limiting column (27) is arranged on the top end of the structure cylinder (23), and the limiting column (27) is sleeved with the groove (29).

7. The apparatus for ammonia evaporation using coke oven flue gas waste heat according to claim 1, characterized in that: A connecting arm (18) is arranged between the periphery of a connecting ring (20) and a movable sleeve (19), a fixed block (22) is arranged on the bottom of a heat exchange plate (16), and the fixed block (22) movably abuts against the movable sleeve (19).

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