Ammonia dephlegmator adopting air forced cooling

Abstract

The utility model provides an ammonia dephlegmator adopting air forced cooling, and belongs to the technical field of wastewater treatment. According to the ammonia dephlegmator adopting air forced cooling, the air inlet is formed in the bottom of the shell layer, the air outlet is formed in the top of the shell layer, and the cooling fans are arranged in the air inlet and the air outlet and used for air circulation; an internal pipeline is vertically arranged in the shell layer in a penetrating manner, a spoiler is arranged in the shell layer, and the spoiler is obliquely arranged and forms an included angle of 60-75 degrees with the interior of the shell layer. By changing the internal structure of the ammonia dephlegmator device and replacing a traditional circulating water cooling system with an air circulating cooling system, the problems of corrosion and scaling caused by circulating water cooling can be solved, water resources can be saved, and the cost and energy consumption of circulating water pretreatment can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater treatment, in particular to an ammonia fractionator adopting forced air cooling. Background Art

[0002] The coking industry generates a large amount of excess ammonia during production. This excess ammonia primarily originates from the 10% surface water and 2% combined water in the coal fed into the coking furnace, as well as from the crude benzene separation water during the gas purification process and gas condensate from the entire plant. This excess ammonia contains significant amounts of volatile ammonia and fixed ammonium. Distillation of this excess ammonia is necessary to ensure that it meets the ammonia requirements for phenol-cyanide wastewater while also recovering the effective ammonia content as an alkaline source for wet oxidation desulfurization, achieving resource utilization.

[0003] The ammonia distillation process is usually carried out in an ammonia still tower, with the top temperature controlled at 102-103°C. The distilled ammonia vapor is condensed to 94-98°C through an ammonia fractionator at the top of the tower to obtain ammonia gas of a certain concentration. The condensate produced is used as reflux and flows directly into the tower. The main function of the ammonia fractionator is to separate and condense ammonia from the mixed gas containing ammonia. The ammonia gas is condensed through heat exchange. Currently, the conventional ammonia vapor condensation at the top of the ammonia still tower generally uses circulating water as the cooling medium, such as Figure 1 As shown in the figure: the circulating water inlet 21 is connected to the cooling water at 33°C, and the circulating water outlet 51 is the cooling return water at 43°C, which requires a large amount of circulating water. At the same time, there are the following problems:

[0004] 1) Corrosion and scaling issues: Although corrosion resistance is taken into consideration when designing most ammonia fractionators, the circulating water in coking plants is often a mixture of treated wastewater and external water sources to save costs. To reduce corrosion and scaling, high requirements are placed on the water quality of the circulating water, requiring regular monitoring and treatment, including pH adjustment, deoxygenation, and softening. The maintenance cost and complexity are very high. More importantly, due to the variability of coking conditions in the actual production process, local water quality problems may occur, which in turn aggravates the corrosion and scaling of the ammonia fractionator, reduces heat exchange efficiency, and increases energy consumption.

[0005] 2) Safety issues: Since circulating water is a fluid medium, it limits the heat exchange efficiency and operational flexibility. It cannot be stopped or delivered urgently in an emergency. In special circumstances, it may even cause dry burning, which is not conducive to emergency response. Utility Model Content

[0006] The purpose of the utility model is to provide an ammonia decompressor using forced air cooling, which can replace the traditional circulating water cooling ammonia decompressor, eliminate the corrosion and scaling caused by the circulating water cooling medium, and reduce operating energy consumption.

[0007] Another object of the present invention is to optimize the internal structure of an ammonia splitter / contractor using forced air cooling to further improve the heat exchange efficiency of air cooling.

[0008] In order to achieve the above-mentioned purpose of the invention, the present invention provides the following technical solutions:

[0009] An ammonia decompressor using forced air cooling, the ammonia decompressor comprising a shell, the bottom of the shell being connected to an ammonia distillation tower, and the top of the shell being provided with an ammonia outlet, characterized in that an air inlet is provided at the bottom of the shell, an air outlet is provided at the top of the shell, and cooling fans are provided in the air inlet and outlet for air circulation;

[0010] An internal pipeline is vertically penetrated inside the shell, a baffle is arranged inside the shell, and the baffle is tilted to form an angle of 60 to 75 degrees with the shell.

[0011] Preferably, the blade side of the cooling fan is connected to the air inlet or the air outlet.

[0012] Preferably, the cooling fan is a variable frequency fan.

[0013] Preferably, the baffle is provided with a through hole, and an internal pipeline is provided in a vertical direction of the through hole to connect with the ammonia inlet and outlet.

[0014] Preferably, the internal pipeline is fixed with a baffle through a through hole, the top of the internal pipeline is connected to the ammonia outlet, and the bottom of the internal pipeline is connected to the ammonia distillation tower.

[0015] Preferably, one end of the baffle is sealed with the shell, and the other end is a cross section forming a gap with the inner wall of the shell. The baffles are alternately arranged left and right in the shell to form an air circulation channel.

[0016] Preferably, the cross-sectional length of the spoiler does not exceed 2 / 3 of the diameter of the spoiler.

[0017] Preferably, a blocking point is provided at the bottom of the spoiler.

[0018] Preferably, the blocking point is arc-shaped, elliptical or semicircular.

[0019] Beneficial effects:

[0020] 1) The utility model adopts air circulation as the cooling medium instead of traditional circulating water as the cooling medium, which not only eliminates the corrosion and structural problems of circulating water cooling, but also saves water resources and reduces the cost and energy consumption of circulating water pretreatment.

[0021] 2) The utility model provides cooling fans at the inlet and outlet to form air flow in the shell of the ammonia splitter, which serves as a heat exchange medium to cool the ammonia mixed gas in the internal pipeline.

[0022] 3) The utility model tilts the baffle so that the angle between it and the shell is 60 to 75 degrees, which can delay the residence time of air in the ammonia decompressor during air circulation and improve the ammonia-air heat exchange efficiency. At the same time, the blocking point at the bottom of the baffle can also form a regional reflux circulation. The tilted baffle and blocking point can also block particulate matter and impurities in the air, reducing the cleaning work of the ammonia decompressor shell using forced air cooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is an overall schematic diagram of the ammonia splitter / contractor using forced air cooling in the present invention;

[0024] Figure 2 This is the internal structure diagram of the ammonia splitter that adopts forced air cooling in the utility model;

[0025] Figure 3 This is a structural diagram of the baffle plate of the ammonia splitter that adopts forced air cooling in the utility model.

[0026] Among them, 1-ammonia inlet, 2-air inlet, 3-ammonia splitter, 31-shell, 32-internal pipeline, 4-baffle, 41-section, 42-through hole, 43-blocking point, 5-air outlet, 6-cooling fan, 7-ammonia outlet, 8-ammonia distillation tower. DETAILED DESCRIPTION

[0027] 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0028] like Figure 1 As shown, this embodiment provides an ammonia fractionator 3 using forced air cooling, and the ammonia fractionator 3 using forced air cooling is arranged on the top of the ammonia distillation tower 8.

[0029] like Figure 2 As shown, the ammonia splitter 3 using forced air cooling in this embodiment includes a shell 31. The bottom of the shell 31 is connected to the ammonia still 8. The top of the shell 31 is provided with an ammonia outlet 7. The bottom of the shell 31 is provided with an air inlet 2, and the top of the shell 31 is provided with an air outlet 5. Cooling fans are provided in the air inlet 2 and the air outlet 5 for air circulation.

[0030] In this embodiment, as an optional solution, the air inlet 2 and the air outlet 5 are respectively arranged on both sides of the shell 31, and a baffle 4 is provided at an adjacent position inside the air inlet 2 entering the ammonia decompressor 3. This is because when air is used as a cooling medium, it is easy to rise quickly due to its light density. At this time, the baffle 4 is provided at the air inlet 2 to slow down the rising speed of the air, so that it can circulate according to the preset air circulation channel, thereby improving the heat exchange efficiency of the air medium.

[0031] In this embodiment, an internal pipeline 32 is vertically extended through the shell 31. A baffle 4 is disposed within the shell 31, and the baffle 4 is tilted at an angle of 60 to 75 degrees relative to the shell 31. In this embodiment, the tilted baffle is designed to enhance the fluidity of the air medium and improve heat exchange efficiency compared to conventional parallel baffles. The angle is also chosen to account for the fact that a too low angle would cause air pressure to accumulate at the top of the angle, hindering air circulation. Furthermore, the tilted baffle also has a settling effect, trapping some particulate matter in the circulating air at the bottom layer.

[0032] In this embodiment, as an optional solution, the blade side of the cooling fan 6 is connected to the air inlet 2 or the air outlet 5. The cooling fan 6 is preferably a variable frequency fan. In this embodiment, a variable frequency fan is selected to drive the fan to automatically adjust the fan speed, stabilize the outlet ammonia temperature, and quickly adjust the action to ensure smooth production process.

[0033] In this embodiment, as an optional solution, the baffle 4 is provided with a through-hole 42. An internal pipe 32 is provided perpendicular to the through-hole 42 and connected to the ammonia inlet and outlet. The internal pipe 32 is fixed to the baffle 4 through the through-hole 42. The top of the internal pipe 32 is connected to the ammonia outlet 7, and the bottom of the internal pipe 32 is connected to the ammonia distillation column 8 through the ammonia inlet 1.

[0034] In this embodiment, as an optional solution, one end of the baffle 4 is sealed with the shell 31, and the other end is a section 41 that forms a gap with the inner wall of the shell 31. The baffle 4 is alternately arranged left and right in the shell 31 to form an air circulation channel.

[0035] In this embodiment, as an optional solution, the length of the spoiler section 41 is not greater than 2 / 3 of the spoiler diameter.

[0036] In this embodiment, as an optional solution, the bottom of the baffle 4 is provided with a blocking point 43, which is arc-shaped, elliptical, or semicircular. In this embodiment, the baffle with the blocking point on the bottom is manufactured by integral molding. The blocking point is provided to prevent moisture in humid air from directly entering the ammonia decontractor and forming water vapor under high temperature conditions. The blocking point can provide initial condensation. At the same time, the arc-shaped, elliptical, or semicircular blocking point can also form a small regional circulation, thereby improving the heat exchange efficiency of the air medium.

[0037] This embodiment also provides an operating scheme for the above-mentioned ammonia splitter using forced air cooling:

[0038] The ammonia mixed gas generated in the ammonia evaporation tower 8 enters the internal pipeline 32 through the ammonia inlet 1 and exchanges heat with the air in the shell of the ammonia decontractor 3; the cooling fan 6 performs forced blowing at the air inlet 2, and sends air into the shell of the ammonia decontractor 3 to exchange heat with the ammonia mixed gas in the internal pipe 32. Under the action of the cooling fan 6, air enters from the air inlet 2 and is forcibly sucked out from the air outlet 5; the ammonia mixed gas after heat exchange and cooling is sent out from the ammonia outlet 7 to enter the next process.

[0039] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. An ammonia decompressor using forced air cooling, comprising a shell, the bottom of which is connected to an ammonia distillation tower, and an ammonia outlet provided at the top of which, characterized in that: An air inlet is provided at the bottom of the shell layer, an air outlet is provided at the top of the shell layer, and cooling fans are provided in the air inlet and the air outlet for air circulation; An internal pipeline is vertically penetrated inside the shell, a baffle is arranged inside the shell, and the baffle is tilted to form an angle of 60 to 75 degrees with the shell.

2. The ammonia splitter with forced air cooling according to claim 1, characterized in that: The cooling fan blade side is communicated with the air inlet or the air outlet.

3. The ammonia splitter with forced air cooling according to claim 1, characterized in that: The cooling fan is a variable frequency fan.

4. The ammonia splitter with forced air cooling according to claim 1, characterized in that: The baffle is provided with a through hole, and an internal pipeline is provided in a vertical direction of the through hole to connect with the ammonia inlet and outlet.

5. The ammonia splitter with forced air cooling according to claim 4, characterized in that: The internal pipeline is fixed with a baffle through a through hole, the top of the internal pipeline is connected to the ammonia outlet, and the bottom of the internal pipeline is connected to the ammonia distillation tower.

6. The ammonia splitter with forced air cooling according to claim 1, characterized in that: One end of the baffle is sealed with the shell, and the other end is a cross section that forms a gap with the inner wall of the shell. The baffles are alternately arranged left and right in the shell to form an air circulation channel.

7. The ammonia splitter with forced air cooling according to claim 6, characterized in that: The cross-sectional length of the spoiler does not exceed 2 / 3 of the diameter of the spoiler.

8. The ammonia splitter with forced air cooling according to claim 1, characterized in that: The bottom of the baffle is provided with a blocking point.

9. The ammonia splitter with forced air cooling according to claim 8, characterized in that: The blocking point is in an arc shape, an ellipse shape or a semicircle shape.

Images