Ammonia tail gas utilization device in ammonia tank area and ammonia synthesis system
By directly transporting the ammonia exhaust from the ammonia tank area and ammonia synthesis system to the normal pressure absorption tower and absorbing it with flash condensate, the high cost and large land occupation of the ammonia exhaust recovery system are solved, and low-energy consumption ammonia exhaust utilization and flue gas desulfurization are achieved.
Patent Information
- Application Number
- CN202421970081.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-14
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-08-14
AI Technical Summary
The ammonia exhaust gas recovery system in the existing ammonia tank area and ammonia synthesis system has high investment costs and large area, and requires multiple sets of equipment, resulting in high energy consumption.
The ammonia exhaust gas from the ammonia tank area and ammonia synthesis system is directly transported to the normal pressure absorption tower, and the flash condensate is used as the absorbent liquid for absorption, the ammonia water preparation device and ammonia exhaust recovery system are cancelled, and the treatment is combined with the urea production system.
It reduces investment costs and footprint, reduces energy consumption, optimizes process design, and realizes the effective utilization of ammonia exhaust and flue gas desulfurization.
Smart Images
Figure CN223112753U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of ammonia tail gas utilization, in particular to an ammonia tail gas utilization device in an ammonia tank area and an ammonia synthesis system. Background Technique
[0002] In the prior art, during the conventional feeding and discharging processes of ammonia storage tanks in the ammonia tank area and liquid ammonia storage tanks in the ammonia synthesis system, and affected by factors such as environmental temperature changes, the pressure in the tanks will fluctuate, and tail gas emissions are required. According to environmental protection requirements, this part of the tail gas needs to be recovered. Based on this, ammonia tail gas recovery systems need to be set up in both the ammonia tank area and the ammonia synthesis system. This system needs to prepare the tail gas into ammonia water, and the ammonia water is transported to the ammonia water tank in the flue gas desulfurization system, and after being compounded with desalted water and liquid ammonia to a suitable concentration, it is sent to the desulfurization tower for desulfurization of ammonia gas. Although the above-mentioned process of ammonia tail gas recovery solves the problem of environmental pollution and realizes the recycling of ammonia tail gas, it has the defects of high investment cost and large floor area of related equipment. Specifically, each set of ammonia tail gas recovery system at least includes an ammonia gas washing tower, a flare system and an ammonia water pump circulation unit that are matched with the ammonia gas washing tower. Generally speaking, at least one set of ammonia tail gas recovery system needs to be configured separately in the ammonia tank area and the ammonia synthesis system. At the same time, in order to meet the requirement that ammonia water enters the desulfurization tower to desulfurize the flue gas, a corresponding ammonia water compounding device also needs to be set up. Content of the Utility Model
[0003] The purpose of the utility model is to provide an ammonia tail gas utilization device in an ammonia tank area and an ammonia synthesis system to solve the technical problems put forward in the above background technique.
[0004] To achieve the above purpose, the utility model provides the following technical scheme:
[0005] An ammonia tail gas utilization device in an ammonia tank area and an ammonia synthesis system includes an ammonia tank area tail gas unit and an ammonia synthesis system tail gas unit. The ammonia tank area tail gas unit and the ammonia synthesis system tail gas unit are respectively connected to an atmospheric absorption tower in a urea production system. The gas phase outlet at the top of the atmospheric absorption tower is connected to a flare system, and the liquid phase outlet at the bottom of the atmospheric absorption tower is connected to a medium-pressure system in urea production. The absorption liquid inlet of the atmospheric absorption tower is connected to a flash vapor condensate tank, and the outlet of the flash vapor condensate tank is also connected to a hydrolysis and analysis device.
[0006] The beneficial effects of the present utility model are as follows: The present utility model overcomes the technical solution in the traditional technology of separately setting up ammonia tail gas recovery systems in the ammonia tank area and the ammonia synthesis system and transporting ammonia water to the flue gas desulfurization system. Instead, the ammonia tail gas in the ammonia tank area and the ammonia synthesis system is directly transported into the atmospheric absorption tower, and the condensate in the flash steam condensate tank is used as the absorption liquid to absorb the ammonia tail gas. Under the condition of reducing the investment cost and the floor area, the treatment load of the condensate by the hydrolysis and analysis device can be reduced.
[0007] Preferably, the ammonia tank area tail gas unit includes a plurality of liquid ammonia storage tanks, and the tail gas outlets at the tops of the liquid ammonia storage tanks are respectively connected to the tail gas inlet of the atmospheric absorption tower through first regulating valves.
[0008] Preferably, the liquid ammonia storage tank is a liquid ammonia spherical tank.
[0009] Preferably, the ammonia synthesis system tail gas unit includes a liquid ammonia storage tank, and the tail gas outlet at the top of the liquid ammonia storage tank is connected to the tail gas inlet of the atmospheric absorption tower through a second regulating valve.
[0010] Preferably, an ammonia condenser is provided between the tail gas outlet at the top of the liquid ammonia storage tank and the second regulating valve, and the liquid phase outlet of the ammonia condenser is connected to the reflux port of the liquid ammonia storage tank.
[0011] Preferably, the tail gas inlet of the atmospheric absorption tower is arranged at the lower part of the atmospheric absorption tower, and the absorption liquid inlet of the atmospheric absorption tower is arranged at the upper part of the atmospheric absorption tower.
[0012] Preferably, a carbon ammonia liquid pump is provided at the outlet of the flash steam condensate tank. The carbon ammonia liquid pump is connected to a second three-way through a first three-way. The third end of the first three-way is connected to the absorption liquid inlet of the atmospheric absorption tower through a third regulating valve; the second end of the second three-way is connected to the hydrolysis and analysis device through a fourth regulating valve, and the third end of the second three-way is connected to the desulfurization tower in the flue gas desulfurization system through a fifth regulating valve.
[0013] An ammonia tail gas utilization device in an ammonia tank area and an ammonia synthesis system made according to the above scheme. By coupling the ammonia tank area and the ammonia synthesis system with the urea production system, the present utility model can not only eliminate the ammonia water preparation device to achieve the purpose of saving energy consumption, but also reduce the hydrolysis and analysis load of the hydrolysis and analysis device in the urea system and save steam consumption; by using the technical solution of the present utility model, the ammonia tail gas recovery system in the ammonia tank area and the ammonia tail gas recovery system in the ammonia synthesis system in the traditional technology, as well as the ammonia water tank and the supporting ammonia water preparation device of the flue gas desulfurization device, can be cancelled, saving the investment cost and reducing the energy consumption of the urea production system at the same time. It has the advantages of reasonable process design, reduced investment cost, reduced floor area, and reduced energy consumption while realizing flue gas desulfurization. Description of the Drawings
[0014] Figure 1 This is a schematic structural diagram of the present utility model.
[0015] In the figure: 1, atmospheric absorption tower; 2, flare system; 3, medium-pressure system for urea production; 4, absorption liquid inlet; 5, flash steam condensate tank; 6, hydrolysis and decomposition device; 7, liquid ammonia storage tank; 8, liquid ammonia storage sump; 9, ammonia condenser; 10, ammonium carbamate solution pump; 11, first three-way valve; 12, second three-way valve; 13, desulfurization tower; 14, first regulating valve; 15, second regulating valve; 16, third regulating valve; 17, fourth regulating valve; 18, fifth regulating valve. Specific embodiments
[0016] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the protection scope of the present utility model.
[0017] Please refer to Figure 1 , the present utility model provides an ammonia tail gas utilization device in an ammonia tank area and an ammonia synthesis system, including an ammonia tank area tail gas unit and an ammonia synthesis system tail gas unit. The ammonia tank area tail gas unit and the ammonia synthesis system tail gas unit are respectively connected to the atmospheric absorption tower 1 in the urea production system. The top gas phase outlet of the atmospheric absorption tower 1 is connected to the flare system 2, and the bottom liquid phase outlet of the atmospheric absorption tower 1 is connected to the medium-pressure system 3 for urea production; the absorption liquid inlet 4 of the atmospheric absorption tower 1 is connected to the flash steam condensate tank 5, and the outlet of the flash steam condensate tank 5 is also connected to the hydrolysis and decomposition device 6. The urea flash evaporation condensate in the urea production system generally enters the hydrolysis and decomposition device 6 for hydrolysis and decomposition treatment, which requires a large amount of steam; after analysis, the components of the urea flash evaporation condensate are 1.58% urea, 1.92% ammonium carbamate, 12.1% ammonia, and 84.4% water. The design pressure of the atmospheric absorption tower 1 is 0.3 MPa(G), the design pressure of the ammonia tail gas emission in the ammonia tank area tail gas unit is 1.6 MPa(G), and the ammonia tail gas emission pressure of the ammonia synthesis system tail gas unit is 1.6 MPa(G). It can be directly sent to the atmospheric absorption tower 1 in the urea system for treatment through its own pressure; the present utility model uses the urea flash evaporation condensate as the absorption liquid in the atmospheric absorption tower 1 to absorb the ammonia tail gas, and the unabsorbed gas can be burned and treated through the flare system 2; the above method can not only reduce the setting of the ammonia tail gas recovery system, but also reduce the treatment load of the hydrolysis and decomposition device 6.
[0018] Furthermore, the tail gas unit of the ammonia tank area includes a number of liquid ammonia storage tanks 7. The tail gas outlets at the tops of the liquid ammonia storage tanks 7 are respectively connected to the tail gas inlets of the atmospheric pressure absorption tower 1 through first regulating valves 14. In the tail gas unit of the ammonia tank area described in the present utility model, there are multiple liquid ammonia storage tanks 7, and each liquid ammonia storage tank 7 is provided with a tail gas outlet. Due to the influence of factors such as the environment, ammonia tail gas is discharged through the tail gas outlet and directly sent into the atmospheric pressure absorption tower 1 for absorption. This not only avoids the equipment for setting up an ammonia tail gas absorption system in the ammonia tank area but also reduces the energy consumption brought about during the operation of the ammonia tail gas absorption system.
[0019] Furthermore, the liquid ammonia storage tank 7 is a spherical liquid ammonia tank.
[0020] Furthermore, the tail gas unit of the ammonia synthesis system includes a liquid ammonia storage tank 8. The tail gas outlet at the top of the liquid ammonia storage tank 8 is connected to the tail gas inlet of the atmospheric pressure absorption tower 1 through a second regulating valve 15. In the present utility model, the liquid ammonia storage tank 8 is provided with a tail gas outlet. Due to the influence of factors such as the environment, ammonia tail gas is discharged through the tail gas outlet and directly sent into the atmospheric pressure absorption tower 1 for absorption. This not only avoids the equipment for setting up an ammonia tail gas absorption system in the ammonia synthesis system but also reduces the energy consumption brought about during the operation of the ammonia tail gas absorption system.
[0021] Furthermore, an ammonia condenser 9 is provided between the tail gas outlet at the top of the liquid ammonia storage tank 8 and the second regulating valve 15. The liquid phase outlet of the ammonia condenser 9 is connected to the reflux port of the liquid ammonia storage tank 8. By setting up the ammonia condenser 9, part of the tail gas in the liquid ammonia storage tank 8 can be recovered to become liquid ammonia and re-enter the liquid ammonia storage tank 8. At the same time, it can also reduce the operation load of the atmospheric pressure absorption tower 1 to achieve the purpose of energy conservation and consumption reduction.
[0022] Furthermore, the tail gas inlet of the atmospheric pressure absorption tower 1 is arranged at the lower part of the atmospheric pressure absorption tower 1, and the absorption liquid inlet 4 of the atmospheric pressure absorption tower 1 is arranged at the upper part of the atmospheric pressure absorption tower 1. Through the above setting, countercurrent contact between the absorption liquid and ammonia tail gas can be realized to achieve the characteristic of fully absorbing the ammonia tail gas.
[0023] Further, a carbon ammonia liquid pump 10 is provided at the outlet of the flash steam condensate tank 5. The carbon ammonia liquid pump 10 is connected to a second three-way valve 12 through a first three-way valve 11. The third end of the first three-way valve 11 is connected to the absorption liquid inlet 4 of the atmospheric pressure absorption tower 1 through a third regulating valve 16. The second end of the second three-way valve 12 is connected to a hydrolysis and analysis device 6 through a fourth regulating valve 17. The third end of the second three-way valve 12 is connected to a desulfurization tower 13 in a flue gas desulfurization system through a fifth regulating valve 18. Through the foregoing analysis of the components of the urea flash condensate, it can also meet the use of the boiler flue gas desulfurization device and has no impact on flue gas desulfurization. Based on this, the present utility model can also use the urea flash condensate as the flue gas desulfurization liquid in the desulfurization tower 13, which not only saves the investment in the ammonia water tank and the supporting ammonia water preparation device of the flue gas desulfurization device, but also can reduce the operating load of the hydrolysis and analysis device 6.
[0024] The working principle of the present utility model is as follows: The ammonia tail gas in several liquid ammonia storage tanks 7 in the ammonia tank area enters the tail gas inlet of the atmospheric pressure absorption tower 1 through a first regulating valve 14. The tail gas in the liquid ammonia storage tank 8 enters an ammonia gas condenser 9 for condensation. Part of the ammonia gas condenses into liquid ammonia and flows back into the liquid ammonia storage tank 8, and the other part of the ammonia gas enters the tail gas inlet of the atmospheric pressure absorption tower 1 through a second regulating valve 15. The urea flash condensate in the flash steam condensate tank 5 is pressurized by a carbon ammonia liquid pump 10 and enters the absorption liquid inlet 4. The foregoing ammonia tail gas ascends, and the urea flash condensate descends as the absorption liquid in the atmospheric pressure absorption tower 1. The two contact countercurrently to achieve the full absorption of the ammonia tail gas by the absorption liquid. The unabsorbed gas enters a flare system 2 through the top gas phase outlet of the atmospheric pressure absorption tower 1 for combustion. The absorbed liquid phase enters a urea production medium pressure system 3 through the bottom liquid phase outlet of the atmospheric pressure absorption tower 1. When it is necessary to desulfurize the flue gas in the desulfurization tower 13, the carbon ammonia liquid pump 10 sends the urea flash condensate into the desulfurization tower 13 of the flue gas desulfurization system through the third end of the second three-way valve 12 and a fifth regulating valve 18 to desulfurize the flue gas. The urea flash condensate in the present utility model preferably ensures the use of the atmospheric pressure absorption tower 1 and the desulfurization tower 13, and the excess urea flash condensate enters the hydrolysis and analysis device 6 for hydrolysis and analysis. The present utility model cancels the ammonia tail gas recovery system in the ammonia tank area and the ammonia tail gas recovery system in the ammonia synthesis system, as well as the ammonia water tank and the supporting ammonia water preparation device of the flue gas desulfurization device, and concentrates the ammonia tail gas in the ammonia tank area tail gas unit and the ammonia synthesis system tail gas unit into the atmospheric pressure absorption tower 1 for treatment using the urea flash condensate as the absorption liquid. At the same time, the urea flash condensate can also be used as the desulfurization liquid to be sent into the desulfurization tower 13 to desulfurize the flue gas, so as to achieve the characteristics of reducing equipment investment, optimizing operation, reducing steam consumption, and improving the economic benefits of gas-liquid.
[0025] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-mentioned exemplary embodiments, and the present utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present utility model. Any reference signs in the claims should not be construed as limiting the claims involved.
Claims
1. An ammonia tail gas utilization device in an ammonia tank area and an ammonia synthesis system, comprising an ammonia tank area tail gas unit and an ammonia synthesis system tail gas unit, characterized in that: The tail gas units of the ammonia tank area and the tail gas unit of the ammonia synthesis system are respectively connected to the atmospheric pressure absorption tower (1) in the urea production system. The gas phase outlet at the top of the atmospheric pressure absorption tower (1) is connected to the flare system (2), and the liquid phase outlet at the bottom of the atmospheric pressure absorption tower (1) is connected to the medium-pressure system (3) of urea production. The absorption liquid inlet (4) of the atmospheric pressure absorption tower (1) is connected to the flash steam condensate tank (5), and the outlet of the flash steam condensate tank (5) is also connected to the hydrolysis and desorption device (6).
2. The ammonia tail gas utilization device in an ammonia tank area and an ammonia synthesis system according to claim 1, characterized in that: The tail gas unit of the ammonia tank area includes a number of liquid ammonia storage tanks (7), and the tail gas outlets at the tops of the liquid ammonia storage tanks (7) are respectively connected to the tail gas inlet of the atmospheric pressure absorption tower (1) through the first regulating valves (14).
3. The ammonia tail gas utilization device in an ammonia tank area and an ammonia synthesis system according to claim 2, characterized in that: The liquid ammonia storage tank (7) is a liquid ammonia spherical tank.
4. The ammonia tail gas utilization device in an ammonia tank area and an ammonia synthesis system according to claim 1, characterized in that: The tail gas unit of the ammonia synthesis system includes a liquid ammonia storage tank (8), and the tail gas outlet at the top of the liquid ammonia storage tank (8) is connected to the tail gas inlet of the atmospheric pressure absorption tower (1) through the second regulating valve (15).
5. The ammonia tail gas utilization device in an ammonia tank area and an ammonia synthesis system according to claim 4, characterized in that: An ammonia condenser (9) is provided between the tail gas outlet at the top of the liquid ammonia storage tank (8) and the second regulating valve (15), and the liquid phase outlet of the ammonia condenser (9) is connected to the reflux port of the liquid ammonia storage tank (8).
6. The ammonia tail gas utilization device in an ammonia tank area and an ammonia synthesis system according to claim 2 or 4, characterized in that: The tail gas inlet of the atmospheric pressure absorption tower (1) is arranged at the lower part of the atmospheric pressure absorption tower (1), and the absorption liquid inlet (4) of the atmospheric pressure absorption tower (1) is arranged at the upper part of the atmospheric pressure absorption tower (1).
7. An ammonia tail gas utilization device in an ammonia tank area and an ammonia synthesis system according to claim 1, characterized in that: A carbamate solution pump (10) is provided at the outlet of the flash steam condensate tank (5). The carbamate solution pump (10) is connected to the second three-way valve (12) through the first three-way valve (11). The third end of the first three-way valve (11) is connected to the absorption liquid inlet (4) of the atmospheric pressure absorption tower (1) through the third regulating valve (16). The second end of the second three-way valve (12) is connected to the hydrolysis and desorption device (6) through the fourth regulating valve (17), and the third end of the second three-way valve (12) is connected to the desulfurization tower (13) in the flue gas desulfurization system through the fifth regulating valve (18).