Chloride ion corrosion resistant ammonia vaporizer

Abstract

This utility model relates to the field of chemical vaporization equipment technology, specifically an ammonia vaporizer resistant to chloride ion corrosion, comprising: a feeding section, a preheating section, a superheating section, and a drying section, sequentially and sealed from bottom to top; the feeding section supplies raw ammonia water and recovers ammonia water; the preheating section preheats the ammonia water; the shell side of the superheating section is connected to a steam pipeline for heating and vaporizing the preheated ammonia water; the drying section dries the vaporized ammonia gas; steam in the shell side of the superheating section is supplied to the shell side of the preheating section and the drying section respectively. This utility model's ammonia vaporizer resistant to chloride ion corrosion employs a preheating followed by heating method, changing the vaporization process and avoiding corrosion of the equipment by accumulated chloride ions.

Description

Technical Field

[0001] This utility model relates to the field of chemical vaporization equipment technology, specifically to an ammonia vaporizer resistant to chloride ion corrosion. Background Technology

[0002] Nitrogen oxides (NOx) are a major component of air pollution, primarily originating from coal-fired power plants, industrial boilers, refineries, and vehicle exhaust. NOx contributes to acid rain, photochemical smog, and PM2.5 formation, and seriously harms human health. Consequently, countries worldwide have established strict limits on NOx emissions.

[0003] The denitrification technology using ammonia is characterized by high efficiency, maturity, and economy, and has become the mainstream solution for industrial denitrification. Its core principle is to use ammonia as a reducing agent to reduce nitrogen oxides into harmless nitrogen and water under the conditions of catalyst and high temperature.

[0004] Currently, ammonia is produced in the following ways: urea pyrolysis / hydrolysis, which has the advantage of no ammonia storage risk, but the equipment is complex, energy consumption is high, the reaction is delayed, and the produced gas contains the greenhouse gas carbon dioxide; liquid ammonia vaporization, which has the advantage of high purity and low operating cost, but it is a major hazard source with high risk and requires strict safety control; and ammonia water vaporization, which has the advantage of high safety and convenient transportation and storage, but the accumulation of chloride ions during vaporization can easily cause equipment corrosion.

[0005] In the ammonia production process by vaporizing ammonia water, the vaporizer is mostly made of stainless steel, which has good thermal conductivity, can improve vaporization efficiency, and the upward tube side allows the produced gas to rise and be discharged after being heated. Steam is used to rapidly heat the ammonia water and make it vaporize quickly. After the ammonia gas and water are discharged in the gas phase, the chloride ions that cannot be volatilized in the liquid phase are enriched at the bottom of the equipment. The concentration of chloride ions in the residual liquid increases from the initial less than 10 ppm to more than 1000 ppm. Under high temperature conditions, the enriched chloride ions will cause pitting corrosion and intergranular corrosion of stainless steel, especially in the heat-affected zone of welding. Utility Model Content

[0006] To address the technical problems existing in the background art, this utility model provides an ammonia vaporizer that prevents chloride ion corrosion. It adopts a preheating and then heating method to change the vaporization process and avoid the accumulation of chloride ions causing corrosion to the equipment.

[0007] The technical solution adopted by this utility model is:

[0008] An ammonia vaporizer resistant to chloride ion corrosion, comprising:

[0009] The feeding section, preheating section, superheating section, and drying section are sequentially sealed and connected from bottom to top.

[0010] The feeding section is used to supply raw ammonia water and recover ammonia water; the preheating section is used to preheat the ammonia water; the shell side of the superheating section is connected to the steam pipeline to heat and vaporize the preheated ammonia water; the drying section is used to dry the vaporized ammonia gas.

[0011] The steam in the shell side of the superheated section is supplied to the shell side of the preheated section and the drying section, respectively.

[0012] Furthermore, the feeding section includes:

[0013] The lower end of the protruding lower end cap is connected to a material inlet and a lower drain outlet, which are connected to a waste ammonia tank.

[0014] Furthermore, the material inlet and the lower sewage outlet extend to the outside of the skirt seat via elbows.

[0015] Furthermore, a recycled material inlet is connected to the material inlet, and the recycled material inlet is connected to the waste ammonia tank via a conveying pump.

[0016] Furthermore, the preheating section includes:

[0017] A preheating cylinder extends vertically. The upper and lower ends of the outer wall of the preheating cylinder are respectively connected to a lower connection port and a condensate drain port. A preheating upper tube sheet and a preheating lower tube sheet are respectively sealed at the upper and lower ends of the preheating cylinder. A preheating tube assembly is installed through and connected between the preheating upper tube sheet and the preheating lower tube sheet. A preheating tube sheet tie rod is screwed and fixed between the preheating upper tube sheet and the preheating lower tube sheet.

[0018] Furthermore, the overheating section includes:

[0019] A superheated cylinder extends vertically. An upper superheated tube sheet is sealed at the upper end of the superheated cylinder, and a lower superheated tube sheet is sealed and fixedly installed on the inner wall of the middle part of the superheated cylinder. A superheated tube sheet tie rod is screwed and fixed between the upper and lower superheated tube sheets. A superheated tube assembly is installed through and connected between the upper and lower superheated tube sheets. A steam inlet, an upper connection port, and a liquid level sensor port are sequentially connected from top to bottom on the outer wall of the superheated cylinder. A connecting pipe is connected to the upper connection port, and the lower end of the connecting pipe is connected to the lower connection port.

[0020] Furthermore, the steam inlet and upper connection port are located above the superheated lower tube sheet.

[0021] The liquid level sensor port is located below the superheated lower tube sheet.

[0022] Furthermore, the drying section includes:

[0023] The drying cylinder extends vertically and contains multiple sets of parallel baffles spaced at intervals. Baffle rods are screwed onto the baffles and fixed to the superheated upper tube sheet. The drying cylinder contains a drying tube assembly that passes through and connects to the superheated upper tube sheet. A drying connecting pipe is connected to the upper end of the drying tube assembly. A thermometer port, a level gauge port, and an upper drain port are connected to the outer wall of the drying cylinder. The upper drain port is connected to a waste ammonia tank.

[0024] The upper end of the drying cylinder is provided with an upwardly protruding upper end cap, and the upper end of the upper end cap is connected to a gas outlet and a local outlet.

[0025] Furthermore, the thermometer port and the upper drain port are respectively located at the upper and lower ends of the outer wall of the drying cylinder, with the upper drain port located directly below the thermometer port.

[0026] The level gauge port assembly is located on the outer wall of the drying cylinder opposite the thermometer port and the upper drain port.

[0027] Furthermore, the baffle plate is configured as an arc shape, with its surface perpendicular to the axis of the drying cylinder.

[0028] The beneficial effects of this utility model of an ammonia vaporizer resistant to chloride ion corrosion are as follows:

[0029] 1. The waste heat from the steam discharged through the superheating section is used to preheat the ammonia water in the preheating section;

[0030] 2. The ammonia water is preheated by vaporization in the superheating section, and the ammonia and water in the gas phase are then dried by adsorption of the water in the gas phase in the drying section.

[0031] 3. Adjust the ammonia supply by monitoring the ammonia level in the superheated section to prevent the backflow of residual liquid with accumulated chloride ions. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall front view of an embodiment of this utility model;

[0033] Figure 2 This is a front view schematic diagram of the feeding section of this utility model embodiment;

[0034] Figure 3 This is a front view schematic diagram of the preheating section of this utility model embodiment;

[0035] Figure 4 This is a front view schematic diagram of the overheating section of this utility model embodiment;

[0036] Figure 5 This is a front view schematic diagram of the drying section of this utility model embodiment.

[0037] In the picture:

[0038] 10. Bottom end cap; 11. Material inlet; 12. Bottom drain outlet; 13. Recycled material inlet.

[0039] 20. Preheating cylinder; 21. Lower connection port; 22. Condensate drain; 23. Upper preheating tube sheet; 24. Lower preheating tube sheet; 25. Preheating tube assembly; 26. Preheating tube sheet tie rod.

[0040] 30. Superheated tube sheet; 31. Upper superheated tube sheet; 32. Lower superheated tube sheet; 33. Superheated tube sheet tie rod; 34. Superheated tube assembly; 35. Steam inlet; 36. Upper connection port; 37. Liquid level sensor port; 38. Connecting pipe.

[0041] 40. Drying cylinder, 41. Baffle plate, 42. Baffle plate tie rod, 43. Drying tube assembly, 44. Drying connecting pipe, 45. Gas outlet, 46. Liquid level gauge assembly, 47. Upper drain outlet, 48. Thermometer port, 49. Local port. Detailed Implementation

[0042] To more clearly and explicitly illustrate the specific implementation objectives and methods of this utility model, the technical solution of this utility model will be fully described below. The described embodiments are only some embodiments of this utility model, not all embodiments. Without creative effort, all other embodiments based on the described embodiments of this utility model are within the protection scope of this utility model.

[0043] This utility model discloses an ammonia vaporizer resistant to chloride ion corrosion, such as... Figure 1 As shown, it includes:

[0044] The feeding section, preheating section, superheating section, and drying section are sequentially sealed and connected from bottom to top.

[0045] The feeding section is used to supply raw ammonia water and recover ammonia water, such as Figure 2 As shown, it includes:

[0046] The lower end cap 10 protrudes downwards, and the lower end of the lower end cap 10 is connected to a material inlet 11 and a lower drain outlet 12. The material inlet 11 and the lower drain outlet 12 extend to the outside of the skirt seat through elbows. The material inlet 11 is connected to a recycling material inlet 13, and the recycling material inlet 13 is connected to the waste ammonia tank via a conveying pump.

[0047] The preheating section is made of silicon carbide and is used to preheat the ammonia water. Figure 3 As shown, it includes:

[0048] A preheating cylinder 20 extends vertically. The upper and lower ends of the outer wall of the preheating cylinder 20 are respectively connected to a lower connection port 21 and a condensate drain port 22. The upper and lower ends of the preheating cylinder 20 are respectively sealed with an upper preheating tube sheet 23 and a lower preheating tube sheet 24. A preheating tube assembly 25 is provided through and connected between the upper preheating tube sheet 23 and the lower preheating tube sheet 24. A preheating tube sheet tie rod 26 is screwed and fixed between the upper preheating tube sheet 23 and the lower preheating tube sheet 24.

[0049] The superheated section is made of silicon carbide and is used to heat and vaporize the preheated ammonia water, such as... Figure 4 As shown, it includes:

[0050] A superheated cylinder 30 extends vertically. An upper superheated tube sheet 31 is sealed at the upper end of the superheated cylinder 30. A lower superheated tube sheet 32 ​​is sealed and fixedly installed on the inner wall of the middle part of the superheated cylinder 30. A superheated tube sheet tie rod 33 is screwed and fixed between the upper superheated tube sheet 31 and the lower superheated tube sheet 32. A superheated tube assembly 34 extends through and connects between the upper superheated tube sheet 31 and the lower superheated tube sheet 32. A steam inlet 35, an upper connection port 36, and a liquid level sensor port 37 are sequentially connected from top to bottom on the outer wall of the superheated cylinder 30. The steam inlet 35 and the upper connection port 36 are located above the lower superheated tube sheet 32, and the liquid level sensor port 37 is located below the lower superheated tube sheet 32. A connecting pipe 38 is connected to the upper connection port 36, and the lower end of the connecting pipe 38 is connected to the lower connection port 21.

[0051] The drying section is used to dry the vaporized ammonia gas, such as... Figure 5 As shown, it includes:

[0052] A drying cylinder 40 extends vertically. Multiple sets of parallel baffles 41 are spaced within the drying cylinder 40. Each baffle 41 is arc-shaped, with its surface perpendicular to the axis of the drying cylinder 40. Baffle rods 42 are screwed onto each baffle 41 and are screwed onto the superheated upper tube sheet 31. A drying tube assembly 43 is located within the drying cylinder 40, penetrating and connecting to the superheated upper tube sheet 31. A drying connecting pipe 44 is connected to the upper end of the drying tube assembly 43. A thermometer port 48 and a level gauge port are connected to the outer wall of the drying cylinder 40. Group 46 and upper drain port 47, the thermometer port 48 and upper drain port 47 are respectively set at the upper and lower ends of the outer wall of the drying cylinder 40, the upper drain port 47 is set directly below the thermometer port 48, the liquid level gauge port group 46 is set on the outer wall of the drying cylinder 40 on the opposite side of the thermometer port 48 and upper drain port 47, the upper drain port 47 is connected to the waste ammonia water tank; the upper end of the drying cylinder 40 is provided with an upward protruding upper end cap, the upper end cap is filled with an adsorption layer, the upper end of the upper end cap is connected to a gas discharge port 45 and a local port 49, the local port 49 is used to install a local pressure gauge and a safety valve.

[0053] The lower end cap 10, preheating cylinder 20, superheating cylinder 30, and drying cylinder 40 are fixedly connected by flanges. The preheating upper tube sheet 23, preheating lower tube sheet 24, and superheating upper tube sheet 31 extend radially outward and are provided with connection perforation groups that match the flange holes.

[0054] Based on the specific structure of an ammonia vaporizer resistant to chloride ion corrosion in the above embodiments, and referring to the accompanying drawings, this manual provides further details. Figure 1 As shown, the workflow is further explained below:

[0055] A. Ammonia water supply:

[0056] The raw material ammonia water is supplied from material inlet 11 to the lower end cap 10 by a feeding pump.

[0057] The recycled ammonia water in the waste ammonia water tank is supplied from the recycled material inlet 13 to the material inlet 11 by a transfer pump, and then mixed with the raw ammonia water in the material inlet 11 before being supplied to the lower end cap 10.

[0058] B. Preheating process:

[0059] The steam discharged from the superheated section enters the preheating cylinder 20 through the lower connection port 21 via the connecting pipe 38, and is discharged through the condensate drain port 22, forming a thermal cycle; thereby preheating the ammonia water in the preheating tube group 25.

[0060] C. Overheating process:

[0061] Steam enters the superheated cylinder 30 through steam inlet 35 and exits through upper connection port 36, forming a thermal cycle; thereby heating and vaporizing the preheated ammonia water in the superheated tube group 34.

[0062] D. Drying process:

[0063] The steam supplied by the superheated section forms a thermal cycle through the drying tube group 43 and the drying connecting pipe 44; thereby heating the vaporized ammonia and water inside the drying cylinder 40. The vaporized water passes through the adsorption layer filled in the upper head, thereby drying the vaporized ammonia.

[0064] The produced dry ammonia gas is discharged from the gas outlet 45.

[0065] In summary, the above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Based on the above description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification. All equivalent variations and modifications of the shape, structure, features, and spirit described in the claims of this utility model should be included within the scope of the claims of this utility model.

Claims

1. An ammonia vaporizer resistant to chloride ion corrosion, characterized in that: include: The feeding section, preheating section, superheating section, and drying section are sequentially sealed and connected from bottom to top. The feeding section is used to supply raw ammonia water and recover ammonia water; The preheating section is used to preheat the ammonia water; The shell side of the superheated section is connected to the steam pipeline to heat and vaporize the preheated ammonia water. The drying section is used to dry the vaporized ammonia gas; The steam in the shell side of the superheated section is supplied to the shell side of the preheated section and the drying section, respectively.

2. The ammonia vaporizer resistant to chloride ion corrosion according to claim 1, characterized in that: The feeding section includes: The lower end of the protruding lower end cap (10) is connected to a material inlet (11) and a lower drain outlet (12), which are connected to the waste ammonia tank.

3. The ammonia vaporizer resistant to chloride ion corrosion according to claim 2, characterized in that: The material inlet (11) and the lower sewage outlet (12) extend to the outside of the skirt seat via elbows.

4. The ammonia vaporizer resistant to chloride ion corrosion according to claim 2, characterized in that: A recycling material inlet (13) is connected to the material inlet (11), and the recycling material inlet (13) is connected to the waste ammonia tank via a conveying pump.

5. An ammonia vaporizer resistant to chloride ion corrosion according to claim 2, 3, or 4, characterized in that: The preheating section includes: A preheating cylinder (20) runs through the vertical direction. The upper and lower ends of the outer wall of the preheating cylinder (20) are respectively connected to a lower connection port (21) and a condensate drain port (22). The upper and lower ends of the preheating cylinder (20) are respectively sealed with a preheating upper tube plate (23) and a preheating lower tube plate (24). A preheating tube group (25) runs through and connects the preheating upper tube plate (23) and the preheating lower tube plate (24). A preheating tube plate tie rod (26) is screwed and fixed between the preheating upper tube plate (23) and the preheating lower tube plate (24).

6. An ammonia vaporizer resistant to chloride ion corrosion according to claim 5, characterized in that: The overheated section includes: A superheated cylinder (30) extends vertically. A superheated upper tube sheet (31) is sealed at the upper end of the superheated cylinder (30). A superheated lower tube sheet (32) is sealed and fixed on the inner wall of the middle part of the superheated cylinder (30). A superheated tube sheet tie rod (33) is screwed and fixed between the superheated upper tube sheet (31) and the superheated lower tube sheet (32). A superheated tube assembly (34) is provided through and connected between the superheated upper tube sheet (31) and the superheated lower tube sheet (32). A steam inlet (35), an upper connection port (36), and a liquid level sensor port (37) are sequentially connected from top to bottom on the outer wall of the superheated cylinder (30). A connecting pipe (38) is connected to the upper connection port (36). The lower end of the connecting pipe (38) is connected to the lower connection port (21).

7. An ammonia vaporizer resistant to chloride ion corrosion according to claim 6, characterized in that: The steam inlet (35) and the upper connection port (36) are located above the superheated lower tube sheet (32); The liquid level sensor port (37) is located below the superheated lower tube sheet (32).

8. An ammonia vaporizer resistant to chloride ion corrosion according to claim 7, characterized in that: The drying section includes: A drying cylinder (40) runs vertically through the body. Multiple sets of parallel baffles (41) are arranged at intervals inside the drying cylinder (40). A baffle rod (42) is screwed and fixed on the baffle (41). The baffle rod (42) is screwed and fixed to the superheated upper tube sheet (31). A drying tube assembly (43) is provided inside the drying cylinder (40). The drying tube assembly (43) runs through and is connected to the superheated upper tube sheet (31). A drying connecting pipe (44) is connected to the upper end of the drying tube assembly (43). A thermometer port (48), a liquid level gauge port assembly (46), and an upper drain port (47) are connected to the outer wall of the drying cylinder (40). The upper drain port (47) is connected to the waste ammonia water tank. The upper end of the drying cylinder (40) is provided with an upwardly protruding upper end cap, and the upper end of the upper end cap is connected to a gas outlet (45) and a local outlet (49).

9. An ammonia vaporizer resistant to chloride ion corrosion according to claim 8, characterized in that: The thermometer port (48) and the upper drain port (47) are respectively located at the upper and lower ends of the outer wall of the drying cylinder (40), with the upper drain port (47) located directly below the thermometer port (48); The level gauge port group (46) is located on the outer wall of the drying cylinder (40) opposite to the thermometer port (48) and the upper drain port (47).

10. An ammonia vaporizer resistant to chloride ion corrosion according to claim 8, characterized in that: The baffle plate (41) is configured as an arc shape, and its surface is perpendicular to the axis of the drying cylinder (40).

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