Ammonia water concentration device

Abstract

The invention relates to the technical field of synthesis ammonia production, in particular to an ammonia water concentration device which comprises an ice maker tank, one end of the ice maker tank is connected with an ammonia purification tower through an ice maker tank blow-down pipe, a first conveying pipe is installed at the bottom of the ammonia purification tower, and the end, away from the ammonia purification tower, of the first conveying pipe is connected with an injection absorber through a second conveying pipe. One end, far away from the second conveying pipe, of the jet absorber is connected with an ammonia water outlet pipe; compared with the prior art, low-concentration ammonia water can be recycled, concentrated ammonia water with the mass concentration of 20% is obtained through circulating concentration, the low-concentration ammonia water is recycled, meanwhile, the requirements of customers can be met, selling is conducted at the market price, benefits are created for companies, a large amount of low-added-value low-concentration ammonia water generated by the system can be fully utilized, energy conservation and consumption reduction are greatly achieved, and the economic benefit is increased. The cost is reduced, the efficiency is increased, and the potential safety and environmental protection hazards caused by overflow of the ammonia water are solved.

Description

Technical Field

[0001] The invention relates to the technical field of synthetic ammonia production, in particular to an ammonia water concentration device. Background Art

[0002] At present, the ammonia recovery device is an auxiliary process of the fixed-bed intermittent gasification and ammonia synthesis system. In order to facilitate the ammonia synthesis reaction, the inert gas is controlled between 18-20%. A part of the circulating gas needs to be sent to the hydrogen extraction station to absorb ammonia in the first ammonia purification tower to form a low-concentration ammonia water, and extract high-concentration hydrogen to be sent to the hydrogen peroxide station for the production of hydrogen peroxide. The ammonia produced by the synthesis station is cooled into liquid ammonia and sent to the spherical tank. The liquid ammonia pressure drops from 20.0Mpa to 2.0Mpa. The gas flashed out in the spherical tank and the air discharged from the ice machine tank are sent to the second ammonia purification tower together, absorbing gas ammonia to form a low-concentration ammonia water. The absorbed gas is sent to the tail gas network for use as fuel gas for the aerospace furnace. The low-concentration ammonia water formed in the ammonia recovery station is sent to urea analysis in large quantities. A large amount of steam is needed to extract ammonia from the ammonia water for urea production, which greatly increases the cost. In addition, the amount of ammonia water produced is greater than the consumption of urea, resulting in a large amount of ammonia water accumulation on site, excessive ammonia odor on site, and the risk of ammonia water overflow, which poses a great environmental risk. The company often sells the excess low-concentration ammonia water at a very low price, causing great losses. Therefore, the present invention proposes an ammonia water concentration device. Summary of the invention

[0003] The object of the present invention is to provide an ammonia water concentration device to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: an ammonia concentration device, comprising an ice machine tank, one end of the ice machine tank is connected to an ammonia purification tower through an ice machine tank vent pipe, a first delivery pipe is installed at the bottom of the ammonia purification tower, the end of the first delivery pipe away from the ammonia purification tower is connected to an ejector absorber through a second delivery pipe, the end of the ejector absorber away from the second delivery pipe is connected to an ammonia outlet pipe, and an ammonia density meter is installed on the ammonia outlet pipe, a regulating control valve is installed on the second delivery pipe, and the regulating control valve and the ammonia density meter are interlocked through a DCS control system, the output end of the ammonia outlet pipe is connected to an ammonia cooler, the end of the ammonia cooler away from the ammonia outlet pipe is connected to an ammonia product tank, the end of the ammonia product tank away from the ammonia cooler is connected to an ammonia shielded pump, and a filling pipe is installed at the output end of the ammonia shielded pump.

[0005] As a preferred technical solution of the present invention, a concentration circulation pipe is installed on the filling pipe, and one end of the concentration circulation pipe away from the filling pipe is connected to the second delivery pipe, and a concentration control valve is installed on the concentration circulation pipe.

[0006] As a preferred technical solution of the present invention, a fifth delivery pipe is installed on one side wall of the jet absorber, and one end of the fifth delivery pipe away from the jet absorber is connected to the ice machine tank.

[0007] As a preferred technical solution of the present invention, the bottom of the ice machine tank is connected to an ammonia cooler via a sixth delivery pipe, the top of the ammonia cooler is connected to an ice machine via a third delivery pipe, and the fifth delivery pipe is fixedly connected to the third delivery pipe.

[0008] As a preferred technical solution of the present invention, the end of the ice machine away from the third delivery pipe is connected to an oil separator, the upper end of the oil separator is connected to the ice machine evaporative condenser through the seventh delivery pipe, and the ice machine evaporative condenser is connected to the ice machine tank through the fourth delivery pipe.

[0009] As a preferred technical solution of the present invention, a urea removal analysis tube is also installed on the first delivery pipe.

[0010] As a preferred technical solution of the present invention, a spherical tank vent pipe is also installed on the ammonia purification tower, and the spherical tank vent pipe is connected to the ice machine tank vent pipe.

[0011] As a preferred technical solution of the present invention, a tail gas discharge pipe is installed at the upper end of the ammonia purification tower, and a desalted water pipe is fixedly installed at the top of one side wall of the ammonia purification tower.

[0012] As a preferred technical solution of the present invention, a coolant inlet pipe is installed at one end of the ammonia water cooler, and a coolant outlet pipe is installed at the other end thereof.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The ammonia water concentration device of the present invention recovers low-concentration ammonia water, circulates and concentrates it to concentrated ammonia water with a mass concentration of 20%, and is sold as a new product. It not only recovers low-concentration ammonia water, but also meets the requirements of customers and is sold at market price, thus creating benefits for the company. It can make full use of a large amount of low-value-added low-concentration ammonia water generated by the system, greatly achieve energy conservation and consumption reduction, create benefits, realize cost reduction and efficiency improvement, and solve the safety and environmental risks caused by ammonia water overflow; at the same time, it saves a large amount of steam and ice machine load consumed during urea opening and analysis, thus achieving cost reduction and efficiency improvement.

[0014] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention; In the figure: 1. ice machine tank; 2. ice machine tank vent pipe; 3. spherical tank vent pipe; 4. ammonia purification tower; 5. first delivery pipe; 6. second delivery pipe; 7. jet absorber; 8. regulating control valve; 9. ammonia outlet pipe; 10. ammonia density meter; 11. ammonia cooler; 12. ammonia product tank; 13. ammonia shielded pump; 14. filling pipe; 15. concentration circulation pipe; 16. concentration control valve; 17. ammonia cooler; 18. third delivery pipe; 19. ice machine; 20. oil separator; 21. ice machine evaporative condenser; 22. fourth delivery pipe; 23. fifth delivery pipe; 24. urea removal analysis pipe; 25. desalted water pipe; 26. tail gas emission pipe. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] In the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0018] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0019] See also Figure 1In this embodiment, an ammonia concentration device is provided, including an ice machine tank 1, one end of the ice machine tank 1 is connected to an ammonia purification tower 4 through an ice machine tank vent pipe 2, a first delivery pipe 5 is installed at the bottom of the ammonia purification tower 4, an end of the first delivery pipe 5 away from the ammonia purification tower 4 is connected to a jet absorber 7 through a second delivery pipe 6, an end of the jet absorber 7 away from the second delivery pipe 6 is connected to an ammonia outlet pipe 9, and an ammonia density meter 10 is installed on the ammonia outlet pipe 9, a regulating control valve 8 is installed on the second delivery pipe 6, and the regulating control valve 8 and the ammonia density meter 10 are interlocked through a DCS control system, an output end of the ammonia outlet pipe 9 is connected to an ammonia cooler 11, and an end of the ammonia cooler 11 away from the ammonia outlet pipe 9 is connected to An ammonia product tank 12 is connected, and an end of the ammonia product tank 12 away from the ammonia cooler 11 is connected to an ammonia shielded pump 13, and a filling pipe 14 is installed on the output end of the ammonia shielded pump 13, and a concentration circulation pipe 15 is installed on the filling pipe 14, and the end of the concentration circulation pipe 15 away from the filling pipe 14 is connected to the second delivery pipe 6, and a concentration control valve 16 is installed on the concentration circulation pipe 15, a fifth delivery pipe 23 is installed on one side wall of the jet absorber 7, and the end of the fifth delivery pipe 23 away from the jet absorber 7 is connected to the ice machine tank 1, the bottom of the ice machine tank 1 is connected to the ammonia cooler 17 through the sixth delivery pipe, the top of the ammonia cooler 17 is connected to the ice machine 19 through the third delivery pipe 18, and the fifth delivery pipe 23 is connected to the first delivery pipe 23 and the second delivery pipe 23. The three delivery pipes 18 are fixedly connected, and the end of the ice machine 19 away from the third delivery pipe 18 is connected to the oil separator 20, and the upper end of the oil separator 20 is connected to the ice machine evaporative condenser 21 through the seventh delivery pipe, and the ice machine evaporative condenser 21 is connected to the ice machine tank 1 through the fourth delivery pipe 22. A urea removal analysis pipe 24 is also installed on the first delivery pipe 5, and a spherical tank vent pipe 3 is also installed on the ammonia purification tower 4, and the spherical tank vent pipe 3 is connected to the ice machine tank vent pipe 2. An exhaust gas discharge pipe 26 is installed on the upper end of the ammonia purification tower 4, and a desalted water pipe 25 is fixedly installed on the top of one side wall of the ammonia purification tower 4. A coolant inlet pipe is installed at one end of the ammonia water cooler 11, and a coolant outlet pipe is installed at the other end. It mainly includes a clean ammonia tower 4, a desalted water pipe 25, and a coolant outlet pipe. Ammonia tower 4 and ammonia cooler 17, newly added jet absorber 7, ammonia water cooler 11, ammonia water product tank 12, ammonia water shielding pump 13. This process makes full use of existing conditions, self-made high-speed jet absorber 7, recycles old ammonia water cooler 11, and waste stainless steel ammonia water product tank 12, connects the low-concentration ammonia water outlet pipeline absorbed by the clean ammonia tower 4 with an operating pressure of 0.8-1.0Mpa with the self-made jet absorber 2, adjusts the control valve 8 to control the jet speed, absorbs and mixes with the gas ammonia at the outlet pressure of about 0.2Mpa of the ammonia cooler in the low-pressure absorption chamber to form concentrated ammonia water with a mass of about 20%, and directly enters the ammonia water cooler by pressure difference, reduces the ammonia water temperature to about 20°C, and enters the ammonia water product tank 12.

[0020] This embodiment can realize the interlocking automatic control of low-concentration ammonia water and high-concentration ammonia water by the online ammonia density meter 10 and the regulating control valve 8, thereby stabilizing the ammonia concentration. If the production is unstable, mainly during the start-up and shutdown periods, the ammonia concentration control valve 16 can also be used to circulate and concentrate the ammonia concentration to ensure that the ammonia concentration is stable at about 20%, so as to achieve qualified product quality.

[0021] Among them, the jet absorber 2 uses pressure potential energy to form a high-speed fluid, forming a low-pressure chamber under this working condition, and then absorbs the ammonia gas at the outlet of the ammonia cooler, which is mixed into high-concentration ammonia water. The pressure difference is used to cool the high-concentration ammonia water to 20°C through the ammonia cooler throughout the entire process, and it is sent to the ammonia product tank and sold to the sales department through a shielded pump. In addition, an ammonia circulation and concentration valve as shown in the figure is added to ensure product quality.

[0022] In actual use of this embodiment, the device operates stably, the product quality is qualified, and the urea analysis processes about 15m3 / h less ammonia water. According to the previous actual consumption of about 300kg steam per 1m3, 4500kg steam can be saved per hour, and the effect is very obvious.

[0023] Among them, the benefit of steam alone is very considerable. Based on the calculation of 200 yuan per ton of steam and 330 days of annual operation, the annual savings are approximately: 330×4500÷1000×24×200=7.128 million yuan.

[0024] This embodiment has the following advantages: full use of pressure potential energy to absorb gaseous ammonia from the ammonia cooler in a self-made jet absorber; full use of the company's existing old equipment, less investment; automatic control of the high-concentration ammonia water density and the low-concentration ammonia water outlet self-regulating valve of the second absorption tower, and the ammonia water circulation concentration valve jointly ensure that the ammonia water concentration is stable at about 20%; simple operation, energy saving and consumption reduction, and create benefits.

[0025] In summary, the present invention has a simple process, a reasonable device, and simple operation. It can recycle low-concentration ammonia water, turn waste into treasure, and make new products with high added value. At the same time, it saves a large amount of steam and ice machine load consumed during the opening and analysis of urea, thereby reducing costs and increasing efficiency.

[0026] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An ammonia water concentration device, characterized in that: The invention comprises an ice machine tank (1), one end of the ice machine tank (1) is connected to an ammonia purification tower (4) via an ice machine tank vent pipe (2), a first delivery pipe (5) is installed at the bottom of the ammonia purification tower (4), an end of the first delivery pipe (5) away from the ammonia purification tower (4) is connected to an ejector absorber (7) via a second delivery pipe (6), an end of the ejector absorber (7) away from the second delivery pipe (6) is connected to an ammonia water outlet pipe (9), an ammonia water density meter (10) is installed on the ammonia water outlet pipe (9), and the second delivery pipe (6) A regulating control valve (8) is installed on the ammonia water outlet pipe (9), and the regulating control valve (8) and the ammonia water density meter (10) are interlocked and controlled by a DCS control system. The output end of the ammonia water outlet pipe (9) is connected to an ammonia water cooler (11), and the end of the ammonia water cooler (11) away from the ammonia water outlet pipe (9) is connected to an ammonia water product tank (12). The end of the ammonia water product tank (12) away from the ammonia water cooler (11) is connected to an ammonia water shielded pump (13), and the output end of the ammonia water shielded pump (13) is installed with a filling pipe (14).

2. The ammonia water concentration device according to claim 1, characterized in that: A concentration circulation pipe (15) is installed on the filling pipe (14), and one end of the concentration circulation pipe (15) away from the filling pipe (14) is connected to the second delivery pipe (6), and a concentration control valve (16) is installed on the concentration circulation pipe (15).

3. The ammonia water concentration device according to claim 1, characterized in that: A fifth delivery pipe (23) is installed on a side wall of the jet absorber (7), and an end of the fifth delivery pipe (23) away from the jet absorber (7) is connected to the ice machine tank (1).

4. The ammonia water concentration device according to claim 3, characterized in that: The bottom of the ice machine tank (1) is connected to an ammonia cooler (17) via a sixth delivery pipe, the top of the ammonia cooler (17) is connected to an ice machine (19) via a third delivery pipe (18), and the fifth delivery pipe (23) is fixedly connected to the third delivery pipe (18).

5. The ammonia water concentration device according to claim 4, characterized in that: An end of the ice machine (19) away from the third delivery pipe (18) is connected to an oil separator (20), an upper end of the oil separator (20) is connected to an ice machine evaporative condenser (21) via a seventh delivery pipe, and the ice machine evaporative condenser (21) is connected to the ice machine tank (1) via a fourth delivery pipe (22).

6. The ammonia water concentration device according to claim 1, characterized in that: A urea removal analysis tube (24) is also installed on the first delivery pipe (5).

7. The ammonia water concentration device according to claim 1, characterized in that: The ammonia purification tower (4) is also provided with a spherical tank vent pipe (3), and the spherical tank vent pipe (3) is connected to the ice machine tank vent pipe (2).

8. The ammonia water concentration device according to claim 1, characterized in that: An exhaust gas discharge pipe (26) is installed at the upper end of the ammonia purification tower (4), and a desalted water pipe (25) is fixedly installed at the top of a side wall of the ammonia purification tower (4).

9. The ammonia water concentration device according to claim 1, characterized in that: A coolant inlet pipe is installed at one end of the ammonia water cooler (11), and a coolant outlet pipe is installed at the other end.

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