Nitro compound fertilizer high tower two-section evaporation tail gas treatment device
By setting up an air cooler and a Venturi scrubber at the evaporation port of the second section of the Nitro Compound High Tower, combined with the separation and defogging treatment of the exhaust gas scrubber, the problem of insufficient exhaust emissions is solved, and effective purification and ultra-low exhaust gases are achieved emission.
Patent Information
- Application Number
- CN202420949443.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-29
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2034-04-29
AI Technical Summary
The existing technology is difficult to effectively reduce the temperature and dust content of the evaporated exhaust gas in the second section of the nitro compound fertilizer tower, resulting in the exhaust emissions not meeting the standards, affecting the social image of the enterprise and violating environmental protection requirements.
A second-stage evaporation exhaust gas treatment device for nitro compound fertilizer tower is designed, and the exhaust gas is completely purified by setting an air cooler at the second-stage evaporation port.
It effectively reduces the exhaust gas temperature and dust content, avoids the phenomenon of white smoke from exhaust gas, meets the indicator requirements of ultra-low emissions of the process, improves the social image of the enterprise and meets environmental protection requirements.
Smart Images
Figure CN222445850U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of tail gas treatment, in particular to a nitro compound fertilizer high tower two-stage evaporation tail gas treatment device. Background Art
[0002] The tail gas at the second stage evaporation outlet is generally treated in the form of direct washing, and the high-temperature tail gas directly enters the washing tower for washing. Since the second stage evaporator of ammonium nitrate is set at a height of 120 meters on the top of the compound fertilizer tower, the tail gas outlet temperature is as high as 175°C, and the circulating cooling water cannot effectively reduce the washing water temperature. In addition, the tail gas contains a small amount of ammonia and ammonium nitrate dust, which is extremely difficult to handle. During normal production, a large amount of white smoke emerges from the second steam outlet on the top of the granulation tower. Although the main component of white smoke is water vapor, the pollutants are relatively few and the impact on the atmosphere is small, the visual perception brought by the large amount of white mist discharged into the air is difficult to accept. This situation has a serious negative impact on the social image of the enterprise.
[0003] As the country continues to increase its efforts to control the flue gas and exhaust gas emissions of enterprises, it is imperative to control the exhaust gas from the second steam outlet. The existing environmental protection facilities have insufficient processing capacity and cannot meet environmental protection requirements. Utility Model Content
[0004] 1. Technical issues to be solved
[0005] In view of the deficiencies in the prior art, the utility model provides a nitro-compound fertilizer high tower second-stage evaporation tail gas treatment device, which solves the problem that the second-stage tail gas emissions of the existing nitro-compound fertilizer high tower do not meet environmental protection standards.
[0006] (II) Technical solution
[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a nitro-compound fertilizer high-tower two-stage evaporation tail gas treatment device, comprising a two-stage evaporator, the outlet of the two-stage evaporator is connected to the air inlet of the air cooler through a pipeline, and a first switch valve is arranged on the pipeline.
[0008] The liquid outlet of the air cooler is provided with three drain pipes, each of which is provided with a second switch valve, and the ends of the three drain pipes are respectively connected to the ammonium nitrate concentration tank, the washing tank and the intermediate tank.
[0009] The air outlet of the air cooler is connected with a scrubber, and the scrubber is communicated with a scrubbing tower through a pipeline.
[0010] As a further preference, an induced draft fan is provided on the top of the washing tower.
[0011] As further preferred, the scrubber is a Venturi scrubber.
[0012] As a further preference, an air supply fan is installed on one side of the air cooler.
[0013] As a further preference, a sewage pipe is provided at the bottom of the scrubber, and the sewage pipe is connected to a sewage tank.
[0014] (III) Beneficial effects
[0015] The utility model provides a nitro compound fertilizer high tower two-stage evaporation tail gas treatment device. It has the following
[0016] Beneficial effects:
[0017] The nitro-compound fertilizer high-tower two-stage evaporation tail gas treatment device effectively cools the high-temperature tail gas by arranging an air cooler at the second-stage evaporation port. The cooled tail gas enters the scrubber, allowing the high-flow scrubbing liquid to form a vacuum zone, fully mixing the gas, liquid and solid phases, so that the dust and ammonia content in the tail gas of the second-stage evaporator is reduced, achieving a pre-washing treatment effect; then the tail gas enters the tail gas washing tower for separation and demisting, and the mist and foam carried in the tail gas are completely removed. When the tail gas after cooling, impurity removal and demisting is discharged again, there is no white smoke phenomenon, which meets the index requirements of the process ultra-low emission. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a schematic diagram of the structure of the utility model.
[0019] In the figure: 1. Second-stage evaporator; 2. Pipeline; 3. First switch valve; 4. Air cooler; 5. Drain pipe; 6. Second switch valve; 7. Ammonium nitrate concentration tank; 8. Washing tank; 9. Intermediate tank; 10. Scrubber; 11. Washing tower; 12. Induced draft fan; 13. Make-up air fan; 14. Drain pipe; 15. Drain tank. DETAILED DESCRIPTION
[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0021] like Figure 1 As shown, the utility model provides a technical solution: a nitro-compound fertilizer high-tower two-stage evaporation tail gas treatment device, comprising a two-stage evaporator 1, the outlet of the two-stage evaporator 1 is connected to the air inlet of an air cooler 4 through a pipeline 2, and a first switch valve 3 is provided on the pipeline 2.
[0022] A make-up air fan 13 is installed on one side of the air cooler 4. The purpose of providing the make-up air fan 13 is to add sufficient cold air to the air cooler 4 and quickly achieve cooling treatment of the exhaust gas. The liquid outlet of the air cooler 4 is provided with three drain pipes 5, and each drain pipe 5 is provided with a second switch valve 6. The ends of the three drain pipes 5 are respectively connected to the ammonium nitrate concentration tank 7, the washing tank 8 and the intermediate tank 9.
[0023] The air outlet of the air cooler 4 is connected to a scrubber 10, which adopts a Venturi scrubber. A drain pipe 14 is provided at the bottom of the scrubber 10, and the drain pipe 14 is connected to a drain tank 15. A small amount of ammonia, ammonium nitrate dust, etc. in the exhaust gas is dissolved in the washing liquid in the scrubber 10 and discharged to the drain tank 15 through the drain pipe 14 to purify the exhaust gas.
[0024] The scrubber 10 is connected to a scrubbing tower 11 through a pipeline 2 . The scrubbing tower 11 is a spray scrubbing tower, and an induced draft fan 12 is disposed on the top of the scrubbing tower 11 .
[0025] Meanwhile, the contents not described in detail in this specification belong to the prior art known to the professional and technical personnel in this field.
[0026] When in use, the two-stage evaporation tail gas treatment device adopts a two-stage treatment method. The first stage: the 175°C tail gas is initially cooled by the ambient low-temperature air through the air cooler 4. During the cooling process, the water vapor is condensed into liquid water and discharged to the second-stage ammonium nitrate concentration tank 7; one way is discharged to the washing tank 8; and the other way is discharged to the intermediate tank 9.
[0027] The second stage: after cooling, the low-temperature saturated tail gas is graded and treated. First, the tail gas from the second-stage evaporator is roughly scrubbed in the venturi scrubber 10, so that the high-flow scrubbing liquid forms a vacuum zone, and the gas, liquid and solid phases are fully mixed to reduce the dust and ammonia content in the tail gas from the second-stage evaporator, thereby achieving a pre-washing treatment effect; then the tail gas enters the tail gas scrubber 11 for separation and demisting, and the mist and foam entrained in the tail gas are completely removed to meet the process ultra-low emission index requirements; the clean gas is directly discharged through the induced draft fan 12 installed on the top of the scrubber 11 as a power source.
[0028] The entire washing system is equipped to achieve zero liquid discharge. The particulate matter in the exhaust gas is recovered to the system in the form of ammonium nitrate solution after washing, achieving water balance and material reuse of the entire washing system.
[0029] In summary, the nitro-compound fertilizer high-tower two-stage evaporation tail gas treatment device effectively cools the high-temperature tail gas by setting an air cooler at the second-stage evaporation port. The cooled tail gas enters the scrubber, allowing the high-flow scrubbing liquid to form a vacuum zone, and fully mixes the gas, liquid, and solid phases to reduce the dust and ammonia content in the tail gas of the second-stage evaporator, thereby achieving a pre-washing treatment effect; and then enters the tail gas washing tower for separation and demisting, and completely removes the mist and foam carried in the tail gas. When the tail gas after cooling, impurity removal, and demisting is discharged again, there will be no white smoke, which meets the index requirements of the process ultra-low emission.
[0030] It should be noted that the electrical components appearing in this article are all connected to the external main controller and 220V or 380V mains electricity, and the main controller can be a conventional known device for controlling computers, etc. Its control principle, internal structure and control switch mode are all conventional means of the prior art, which are directly quoted here without further elaboration. In this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.
[0031] 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. A nitro-compound fertilizer high tower two-stage evaporation tail gas treatment device, characterized in that: It comprises a two-stage evaporator (1), the outlet of the two-stage evaporator (1) is connected to the air inlet of an air cooler (4) through a pipeline (2), and a first switch valve (3) is arranged on the pipeline (2); The liquid outlet of the air cooler (4) is provided with three liquid discharge pipes (5), each of which is provided with a second switch valve (6), and the ends of the three liquid discharge pipes (5) are respectively connected to the ammonium nitrate concentration tank (7), the washing tank (8) and the intermediate tank (9); The air outlet of the air cooler (4) is connected to a scrubber (10), and the scrubber (10) is connected to a scrubbing tower (11) via a pipeline (2).
2. A nitro-compound fertilizer high tower two-stage evaporation tail gas treatment device according to claim 1, characterized in that: An induced draft fan (12) is provided on the top of the washing tower (11).
3. The nitro-compound fertilizer high tower two-stage evaporation tail gas treatment device according to claim 1 is characterized in that: The scrubber (10) is a Venturi scrubber.
4. The nitro-compound fertilizer high tower two-stage evaporation tail gas treatment device according to claim 1, characterized in that: An air supply fan (13) is installed on one side of the air cooler (4).
5. The nitro-compound fertilizer high tower two-stage evaporation tail gas treatment device according to claim 1, characterized in that: A sewage pipe (14) is provided at the bottom of the scrubber (10), and the sewage pipe (14) is connected to a sewage tank (15).