Urea hydrolysis hydrophobic tank noise reduction energy saving hydrophobic structure

Abstract

The utility model discloses a kind of urea hydrolysis drain tank noise reduction energy-saving drain structure, belong to ammonia production technical field.To solve the noise pollution caused by the pressure change of water vapor, the impact of escaped water vapor on drain tank and the vibration of drain tank and its connected pipeline equipment caused by drain tank, and the waste of heat and water resources caused by steam escape problem, the noise reduction energy-saving drain structure of the utility model includes high-temperature drain pipe, the outlet end of the high-temperature drain pipe is provided with a drain, the shape of the drain is similar to the dome shape of pot cover, the outlet end of the high-temperature drain pipe penetrates the top center of the dome shape of the drain.The utility model improves the heat exchange efficiency of drain, solves the problem of drain recovery noise and vibration.

Description

Technical Field

[0001] This utility model belongs to the field of ammonia production technology, specifically, it relates to a noise-reducing, energy-saving, and hydrophobic structure for a urea hydrolysis hydrophobic tank. Background Technology

[0002] Selective catalytic reduction (SCR) is the main denitrification process for flue gas in thermal power units. The reducing agent NH3 for SCR denitrification can be obtained by decomposing anhydrous liquid ammonia (NH3) or urea (CO(NH2)2). Since liquid ammonia is a major hazard source, in recent years, thermal power units have gradually switched from liquid ammonia denitrification to urea-based ammonia denitrification.

[0003] Among these technologies, urea-to-ammonia production primarily relies on urea hydrolysis. Urea hydrolysis uses generator steam as a heat source, causing the urea solution to hydrolyze at a temperature of 135-160℃ and a pressure of approximately 0.35-0.65 MPa, generating a hydrolyzed vapor mixture containing NH3. The hydrolysis reaction is as follows: CO(NH2)2 + H2O → 2NH3 + CO2. Urea hydrolysis takes place in a urea hydrolyzer, typically heated by steam. The heated steam is then introduced into a condensate tank for recovery via a condensate drain pipe.

[0004] In actual operation, to reduce the escape of water vapor from the water supply pipe, the water supply pipe is usually inserted to the bottom of the condensate tank (see...). Figure 1 Because the urea hydrolyzer condensate (hereinafter referred to as "high-temperature condensate") has a high temperature (temperature > 140℃) and contains a large amount of water vapor, and the condensate tank needs to maintain a certain liquid level (usually between 3-4 meters) to meet the requirements of urea dissolution, urea conveying pipeline flushing, etc., when the high-temperature condensate volume is large, a large amount of water vapor overcomes the pressure inside the condensate tank and rushes out. When the high-temperature condensate volume is small, a large amount of water vapor accumulates in the condensate pipe. As the condensate volume increases, the pressure inside the condensate pipe continuously increases. When the pressure at the condensate pipe outlet is greater than the water depth pressure inside the condensate tank, the water vapor in the condensate pipe overcomes the pressure inside the condensate tank and rushes out. Regardless of the filling method, the water vapor in the high-temperature condensate pipe rushes out and rises and escapes inside the condensate tank. During this process, due to the pressure change of water vapor, a large amount of noise pollution is generated. At the same time, the escaping water vapor impacts the condensate tank, causing vibration of the condensate tank and its connected pipeline equipment, which damages the equipment. In addition, a large amount of water vapor overflows, resulting in some steam escape, which wastes heat and water resources. Utility Model Content

[0005] In view of the above-mentioned problems in the existing technology, the purpose of this utility model is to provide a noise-reducing and energy-saving hydrophobic structure for a urea hydrolysis hydrophobic tank, which improves the heat exchange efficiency of hydrophobicity and solves the problems of noise and vibration in hydrophobic recovery.

[0006] To solve the above problems, the technical solution adopted by this utility model is as follows:

[0007] A noise-reducing and energy-saving hydrophobic structure for a urea hydrolysis hydrophobic tank includes a high-temperature hydrophobic pipe with a hydrophobic outlet at its outlet end. The hydrophobic outlet is dome-shaped, similar to a pot lid, and the outlet end of the high-temperature hydrophobic pipe passes through the center of the top of the dome-shaped hydrophobic outlet.

[0008] The ratio of the height of the drainage outlet to its bottom diameter is 3:10-1:2.

[0009] The bottom diameter of the drainage outlet shall not exceed 3000 mm.

[0010] The cover of the drainage port has several air holes.

[0011] The shape of the pores is circular or polygonal.

[0012] The pore diameter is 20-50 mm.

[0013] The diameter of several of the pores gradually increases outward from the outlet end of the high-temperature condensate drain pipe.

[0014] The edge of the cover of the drainage outlet is provided with a raised edge in the shape of a lotus leaf.

[0015] This invention modifies the on-site equipment to increase the contact area between the high-temperature condensate drain and the condensate drain in the drain tank (hereinafter referred to as "low-temperature condensate drain"). An air vent is provided on the high-temperature condensate drain outlet, allowing high-pressure water vapor to enter the drain tank in the form of small water bubbles. Compared to existing technologies, the advantages of this invention are:

[0016] 1. This utility model effectively increases the contact area between high-temperature hydrophobicity and low-temperature hydrophobicity, accelerates the efficiency of heat conduction, and effectively prevents the low-temperature hydrophobicity from rapidly vaporizing and expanding in volume when heated, thus preventing violent oscillations.

[0017] 2. In this invention, the high-pressure steam enters the condensate tank in the form of small bubbles and bursts in the low-temperature condensate, which can effectively release pressure and prevent high pressure from impacting the condensate tank.

[0018] 3. The low-temperature hydrophobic of this invention exchanges heat by absorbing water vapor bubbles, which can greatly reduce the thermal resistance layer in the hydrophobic layer, break the temperature gradient, increase the heat transfer area, increase the collision frequency of high and low temperature hydrophobic layers, and greatly improve the heat exchange efficiency of the hydrophobic layer. Attached Figure Description

[0019] Figure 1 A schematic diagram of urea hydrolysis for ammonia production using existing technology;

[0020] Figure 2 This is a schematic diagram of the noise reduction, energy saving, and hydrophobic structure of the urea hydrolysis hydrophobic tank in this application;

[0021] Figure 3 This is a schematic diagram of the drainage outlet of this application;

[0022] Figure 4 This is a top view of the drainage outlet of this application;

[0023] In the diagram: 1. Drain outlet; 2. High-temperature drain pipe; 3. Curved edge; 4. Air pore. Detailed Implementation

[0024] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0025] Figure 1 This is a schematic diagram of the existing technology for producing ammonia from urea through hydrolysis. Figure 2-4 The noise reduction and energy-saving drainage structure of the urea hydrolysis drainage tank shown in this application adds a dome-shaped drainage port 1 similar to a pot lid to the outlet end of the high-temperature drainage pipe 2. The bottom size of the drainage port 1 can be adjusted according to the drainage volume and the pressure and temperature of the high-temperature drainage. Its diameter does not exceed 3000mm. The ratio of the height of the drainage port 1 to the bottom diameter is between 3:10 and 1:2, so as to maximize the contact area between the high-temperature drainage and the low-temperature drainage, while providing space for the arrangement of pores.

[0026] The drain outlet 1 has several air holes 4. The shape of the air holes is not limited and can be circular, triangular, rectangular, or polygonal, etc. Here, a circular air hole is used as an example (see Figure 4 The diameter of the pores 4 is between 20-50mm, and they are arranged on the drain outlet 1, with the size increasing sequentially from the center (the outlet end of the high temperature drain pipe 2) outwards.

[0027] Due to the presence of a large amount of steam in the high-temperature condensate drain, the pressure inside drain 1 continuously increases as the steam accumulates, constantly displacing the low-temperature condensate within drain 1. When the low-temperature condensate level in drain 1 drops to the position of the vent on drain 1, the pressure inside drain 1 increases again as the high-temperature condensate accumulates, causing the water vapor to turn into small bubbles and escape from vent 4. The vent 4 is arranged with a smaller top and a larger bottom, which facilitates rapid discharge even when the volume of high-temperature condensate is large.

[0028] The edge of the drainage outlet 1 is provided with a raised edge 3, which is a lotus leaf edge that is raised 20-40mm. Water vapor that is not discharged through the vent 4 is quickly discharged through the raised edge 3. The raised edge 3 divides the water vapor in the high-temperature drainage outlet into small bubbles, which facilitates direct heat transfer and reduces vibration.

[0029] This application has been described with reference to the above embodiments. It should be understood that the above embodiments do not limit this application in any way. All technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of this application.

Claims

1. A noise-reducing, energy-saving, and hydrophobic structure for a urea hydrolysis hydrophobic tank, comprising a high-temperature hydrophobic pipe (2), characterized in that, The outlet end of the high-temperature drain pipe (2) is provided with a drain port (1), and the shape of the drain port (1) is a dome shape similar to a pot lid. The outlet end of the high-temperature drain pipe (2) passes through the top center of the dome shape of the drain port (1).

2. The noise-reducing, energy-saving, and hydrophobic structure for the urea hydrolysis hydrophobic tank according to claim 1, characterized in that, The ratio of the height of the drainage outlet (1) to its bottom diameter is 3:10-1:

2.

3. The noise-reducing, energy-saving, and hydrophobic structure for the urea hydrolysis hydrophobic tank according to claim 1, characterized in that, The bottom diameter of the drainage outlet (1) does not exceed 3000 mm.

4. The noise-reducing, energy-saving, and hydrophobic structure for the urea hydrolysis hydrophobic tank according to claim 1, characterized in that, The cover of the drain outlet (1) has several air holes (4).

5. The noise-reducing, energy-saving, and hydrophobic structure for the urea hydrolysis hydrophobic tank according to claim 4, characterized in that, The shape of the pore (4) is circular or polygonal.

6. The noise-reducing, energy-saving, and hydrophobic structure for the urea hydrolysis hydrophobic tank according to claim 4, characterized in that, The diameter of the pores (4) is 20-50 mm.

7. The noise-reducing, energy-saving, and hydrophobic structure for the urea hydrolysis hydrophobic tank according to claim 4, characterized in that, The diameter of several of the pores (4) gradually increases outward from the outlet end of the high-temperature condensate pipe (2).

8. The noise-reducing, energy-saving, and hydrophobic structure for the urea hydrolysis hydrophobic tank according to claim 1, characterized in that, The edge of the cover of the drainage outlet (1) is provided with a lotus leaf-shaped upturned edge (3).

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