Ammonia distillation tower for ammonia gas concentration

Abstract

The utility model discloses an ammonia distillation tower for ammonia concentration, which relates to the technical field of ammonia concentration and comprises a cold drum, a heat exchanger is arranged on one side of the cold drum, a first connecting pipe is arranged between the cold drum and the heat exchanger, an ammonia distillation tower body is arranged on one side of the heat exchanger, and a second connecting pipe is arranged on the other side of the heat exchanger. A conveying pipe is arranged between the side wall of the ammonia still body and the heat exchanger, a conveying pump is arranged in the middle of the conveying pipe, a backflow pipe is arranged between the lower end of the ammonia still body and the heat exchanger, a heat exchange pipe is arranged in the heat exchanger, and the two ends of the heat exchange pipe are connected with a first connecting pipe and the conveying pipe respectively. A wastewater discharge pipe is arranged on the outer wall of the heat exchanger, a valve is arranged at the upper end of the wastewater discharge pipe, and a deacidification section tower body is arranged at the upper end of the ammonia distillation tower body. According to the ammonia still for ammonia concentration, the concentration of ammonia water can be improved, and meanwhile, the stability of a desulfurization system is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to ammonia gas concentration technology field especially relates to a kind of for ammonia gas concentration's ammonia stripping column. BACKGROUND

[0002] The operation of prior art in ammonia gas concentration is usually that the remaining ammonia water of cold drum enters ammonia water heat exchanger and exchanges heat with waste water from the bottom of ammonia stripping column, the remaining ammonia water is heated to 80~100 DEG C from 70 DEG C, then enters ammonia stripping column, the ammonia gas evaporated from ammonia stripping column enters ammonia splitter and is cooled by circulating water, the liquid condensed directly returns to ammonia stripping column to do reflux, the ammonia gas after concentration enters ammonia water cooler to cool, the ammonia water containing about 8% ammonia after cooling enters desulfurization solution system.

[0003] The ammonia water concentration of the top of existing ammonia stripping column is about 8%, and the low ammonia water concentration causes the increase of desulfurization waste liquid amount, and the ammonia stripping treatment efficiency is low, which cannot meet the treatment demand of remaining ammonia water in overload production, in order to solve the deficiency of prior art, the utility model provides a kind of for ammonia gas concentration's ammonia stripping column. CONTENT OF UTILITY MODEL

[0004] The main purpose of the utility model is to provide a kind of for ammonia gas concentration's ammonia stripping column, which can effectively solve the problems in the background art.

[0005] To achieve the above-mentioned purpose, the technical scheme adopted by the utility model is as follows:

[0006] An ammonia stripping column for ammonia gas concentration, comprising a cold drum, a heat exchanger is arranged on one side of the cold drum, a first connecting pipe is arranged between the cold drum and the heat exchanger, an ammonia stripping column body is arranged on one side of the heat exchanger, a conveying pipe is arranged between the side wall of the ammonia stripping column body and the heat exchanger, a conveying pump is arranged in the middle of the conveying pipe, a reflux pipe is arranged between the lower end of the ammonia stripping column body and the heat exchanger, heat exchange pipes are arranged in the heat exchanger, the two ends of the heat exchange pipes are connected with the first connecting pipe and the conveying pipe respectively, a waste water discharge pipe is arranged on the outer wall of the heat exchanger, a valve is arranged on the upper end of the waste water discharge pipe, a deacidification section column body is arranged on the upper end of the ammonia stripping column body, circulation pipes are arranged on the upper and lower positions of the deacidification section column body on the outer wall of the ammonia stripping column body, the circulation pipes are U-shaped, condensing pipes are arranged on the outer wall of the circulation pipes, cold water outlets and cold water inlets are arranged on the side wall of the condensing pipes, the cold water inlets are below the cold water outlets, gas outlet pipes are arranged on the outer wall below the circulation pipes, acid gas condensation separators are arranged on the lower ends of the gas outlet pipes, desulfurizers are arranged on one side of the acid gas condensation separators, and second connecting pipes are arranged between the acid gas condensation separators and the desulfurizers.

[0007] Preferably, the heat exchange pipes are curved in shape inside the heat exchanger, and cavities are arranged between the heat exchange pipes and the inner wall of the heat exchanger.

[0008] Preferably, the inside of the deacidification section tower body contains alkaline liquid.

[0009] Preferably, a cavity is arranged between the outer wall of the circulating pipe and the inner wall of the condensing pipe.

[0010] Preferably, the upper end of the gas outlet pipe is provided with an inclined curved pipe.

[0011] Preferably, the acid gas condensation separator is a centrifugal separation type separator.

[0012] Preferably, the inside of the desulfurizer contains activated carbon, activated alumina and molecular sieve.

[0013] Preferably, a mounting interface is arranged between the conveying pump and the conveying pipe, and the conveying pump is detachably connected with the conveying pipe through the mounting interface.

[0014] Compared with the prior art, the present application has the following beneficial effects:

[0015] 1. In the present application, the deacidification section tower body is arranged to replace the tower top condenser in the prior art, so that the acid gas in the ammonia gas evaporated by the ammonia tower body can be removed, the concentration of ammonia water at the top of the ammonia tower can be improved, the concentration of ammonia water collected at the top can be improved to %, the amount of waste liquid for desulfurization is reduced, resources are saved, the environment is better protected, the production efficiency is improved, and the balance stability of the desulfurization system is improved.

[0016] 2. In the present application, the acid gas condensation separator is arranged to cool the ammonia gas after evaporation, improve the cooling efficiency, and the continuity of the device is stronger and the running stability is higher. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a schematic view of the overall structure of the present application;

[0018] Figure 2 is a schematic view of the structure of the ammonia tower body of the present application;

[0019] Figure 3 is a schematic view of the connection structure of the condensing pipe of the present application;

[0020] Figure 4 is a schematic view of the structure of the heat exchanger of the present application.

[0021] In the figure: 1, cold drum; 2, first connecting pipe; 3, heat exchanger; 4, conveying pipe; 5, ammonia distillation tower body; 6, circulating pipe; 7, condensing pipe; 8, gas outlet pipe; 9, acid gas separation condenser; 10, second connecting pipe; 11, desulfurizer; 12, conveying pump; 13, return pipe; 14, acid removal section tower body; 15, cold water outlet; 16, cold water inlet; 17, heat exchange pipe; 18, waste water discharge pipe; 19, valve; 20, ammonia gas outlet. DETAILED DESCRIPTION

[0022] In order to make the technical means, creative features, purposes and effects of the utility model easy to understand, the utility model is further described below in combination with specific embodiments.

[0023] For example, Figures 1-4As shown, the side of the cold drum 1 is provided with a heat exchanger 3, and a first connecting pipe 2 is arranged between the cold drum 1 and the heat exchanger 3, the first connecting pipe 2 connects the cold drum 1 and the heat exchanger 3, the ammonia water in the cold drum 1 enters the inside of the heat exchanger 3 through the first connecting pipe 2, the heat exchanger 3 is used for heat exchange of the ammonia water, one side of the heat exchanger 3 is provided with an ammonia tower body 5, the ammonia tower body 5 is used for ammonia evaporation work, a conveying pipe 4 is arranged between the side wall of the ammonia tower body 5 and the heat exchanger 3, the ammonia water after heat exchange in the heat exchanger 3 is conveyed into the inside of the ammonia tower body 5 through the conveying pipe 4, a conveying pump 12 is arranged in the middle of the conveying pipe 4, the conveying pump 12 provides power for ammonia water conveying, a backflow pipe 13 is arranged between the lower end of the ammonia tower body 5 and the heat exchanger 3, the waste water in the ammonia tower body 5 flows into the inside of the heat exchanger 3 through the backflow pipe 13, and the waste water heats the ammonia water in the heat exchanger 3, the heat exchanger 3 is internally provided with a heat exchange pipe 17, the two ends of the heat exchange pipe 17 are connected with the first connecting pipe 2 and the conveying pipe 4 respectively, the ammonia water is heat exchanged in the middle of the heat exchange pipe 17 in the inside of the heat exchanger 3, the heat exchange pipe 17 and the inner wall of the heat exchanger 3 have a cavity, the waste water backflowed through the backflow pipe 13 fills the cavity in the heat exchanger 3, the heat exchange pipe 17 is continuously curved in the inside of the heat exchanger 3, so that the contact area with the waste water is increased, the outer wall of the heat exchanger 3 is provided with a waste water discharge pipe 18, the waste water discharge pipe 18 is used for discharging the waste water in the cavity in the heat exchanger 3, the upper end of the waste water discharge pipe 18 is provided with a valve 19, the valve 19 controls the opening and closing of the waste water discharge pipe 18, the upper end of the ammonia tower body 5 is provided with a deacidification section tower body 14, the inside of the deacidification section tower body 14 contains alkaline liquid, which is used for removing acidic gas in the ammonia gas, the outer wall of the ammonia tower body 5 is provided with a circulating pipe 6 at the upper and lower positions of the deacidification section tower body 14, the circulating pipe 6 is U-shaped, the outer wall of the circulating pipe 6 is provided with a condensing pipe 7 in the middle, the ammonia gas evaporated by the ammonia tower body 5 enters the middle of the circulating pipe 6, and then the condensing pipe 7 cools the ammonia gas, the liquid after cooling flows back into the inside of the ammonia tower body 5, the side wall of the condensing pipe 7 is provided with a cold water outlet 15 and a cold water inlet 16, the cold water inlet 16 is below the cold water outlet 15, and the cooling water flows in the inside of the condensing pipe 7 through the cold water outlet 15 and the cold water inlet 16 to cool the ammonia gas, and the cold water inlet 16 being below the cold water outlet 15 can keep the inside of the condensing pipe 7 always filled with cooling water during the cooling process.

[0024] As Figures 1-4As shown, the lower outer wall of the circulation pipe 6 is provided with the gas outlet pipe 8, the upper end of the gas outlet pipe 8 is provided with an upwardly inclined bend for preventing the condensed ammonia water from flowing into the interior of the gas outlet pipe 8, the lower end of the gas outlet pipe 8 is provided with the acid gas separation condenser 9, the cooled ammonia gas enters the interior of the acid gas separation condenser 9 through the gas outlet pipe 8, the acid gas separation condenser 9 removes the acid from the ammonia gas through centrifugal separation while cooling, one side of the acid gas separation condenser 9 is provided with the desulfurizer 11, the second connecting pipe 10 is arranged between the acid gas separation condenser 9 and the desulfurizer 11, the second connecting pipe 10 connects the acid gas separation condenser 9 and the desulfurizer 11, the cooled ammonia gas in the interior of the acid gas separation condenser 9 enters the interior of the desulfurizer 11 through the second connecting pipe 10, the interior of the desulfurizer 11 contains activated carbon, activated alumina and molecular sieve etc. for desulfurizing the ammonia gas, the outer wall of the desulfurizer 11 is provided with the ammonia gas outlet 20, the concentrated ammonia gas is discharged from the ammonia gas outlet 20.

[0025] It should be noted that the utility model is an ammonia stripping tower for ammonia concentration, when in use, the ammonia water in the cold drum 1 flows into the heat exchange pipe 17 in the interior of the heat exchanger 3 from the first connecting pipe 2, the waste water in the interior of the ammonia stripping tower body 5 flows into the cavity in the interior of the heat exchanger 3 through the reflux pipe 13, the ammonia water in the heat exchange pipe 17 is heated, after heating, the delivery pump 12 is started to deliver the ammonia water into the interior of the ammonia stripping tower body 5, after stripping, a part of the acid gas is removed through the deacidification section tower body 14, then the ammonia gas enters the middle of the circulation pipe 6, the cold water inlet 16 on the side wall of the condensation pipe 7 is connected with the cold water pipe, the cold water inlet 16 is connected with the drain pipe, the ammonia gas in the middle of the circulation pipe 6 is condensed, the condensed liquid flows back into the interior of the ammonia stripping tower body 5, the gas enters the interior of the acid gas separation condenser 9 from the gas outlet pipe 8, is deacidified and cooled, then enters the interior of the desulfurizer 11 through the second connecting pipe 10 for desulfurization, and finally is discharged from the ammonia gas outlet 20.

[0026] The basic principle and main features of the utility model and the advantages of the utility model are shown and described above. It should be understood by those skilled in the art that the utility model is not limited by the above-mentioned embodiments, the above-mentioned embodiments and the description in the specification only illustrate the principle of the utility model, various changes and improvements of the utility model can be made without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of the utility model claimed. The protection scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. An ammonia stripping column for ammonia concentration comprising a cold drum (1), characterized in that: The side of the cold drum (1) is provided with a heat exchanger (3), the cold drum (1) and the heat exchanger (3) are provided with a first connecting pipe (2), one side of the heat exchanger (3) is provided with an ammonia evaporation tower body (5), the side wall of the ammonia evaporation tower body (5) and the heat exchanger (3) are provided with a conveying pipe (4), the middle of the conveying pipe (4) is provided with a conveying pump (12), the lower end of the ammonia evaporation tower body (5) and the heat exchanger (3) are provided with a backflow pipe (13), the inside of the heat exchanger (3) is provided with a heat exchange pipe (17), both ends of the heat exchange pipe (17) are connected with the first connecting pipe (2) and the conveying pipe (4) respectively, the outer wall of the heat exchanger (3) is provided with a waste water discharge pipe (18), the upper end of the waste water discharge pipe (18) is provided with a valve (19), the upper end of the ammonia evaporation tower body (5) is provided with a deacidification section tower body (14), the outer wall of the ammonia evaporation tower body (5) is provided with a circulating pipe (6) above and below the deacidification section tower body (14), the circulating pipe (6) is U-shaped, the outer wall of the circulating pipe (6) is provided with a condensing pipe (7) in the middle, the side wall of the condensing pipe (7) is provided with a cold water outlet (15) and a cold water inlet (16), the cold water inlet (16) is below the cold water outlet (15), the outer wall of the circulating pipe (6) is provided with an air outlet pipe (8) below, the lower end of the air outlet pipe (8) is provided with an acid gas condensation separator (9), one side of the acid gas condensation separator (9) is provided with a desulfurizer (11), the acid gas condensation separator (9) and the desulfurizer (11) are provided with a second connecting pipe (10), the outer wall of the desulfurizer (11) is provided with an ammonia gas outlet (20).

2. An ammonia stripping column for ammonia concentration according to claim 1, characterized in that: The heat exchange pipe (17) is curved in the inside of the heat exchanger (3), and a cavity is arranged between the heat exchange pipe (17) and the inner wall of the heat exchanger (3).

3. An ammonia stripping column for ammonia concentration according to claim 1, characterized in that: The inside of the deacidification section tower body (14) contains alkaline liquid.

4. An ammonia stripping column for ammonia concentration according to claim 1, characterized in that: A cavity is arranged between the outer wall of the circulating pipe (6) and the inner wall of the condensing pipe (7).

5. An ammonia stripping column for ammonia concentration according to claim 1, characterized in that: The upper end of the air outlet pipe (8) is provided with an inclined curved pipe.

6. An ammonia stripping column for ammonia concentration according to claim 1, characterized in that: The acid gas condensation separator (9) is a centrifugal separation type separator.

7. An ammonia stripping column for ammonia concentration according to claim 1, characterized in that: The inside of the desulfurizer (11) contains activated carbon, activated alumina and molecular sieve.

8. An ammonia stripping column for ammonia concentration according to claim 1, characterized in that: A mounting interface is arranged between the conveying pump (12) and the conveying pipe (4), and the conveying pump (12) is detachably connected with the conveying pipe (4) through the mounting interface.

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