Sulfur trioxide production device

Abstract

The utility model discloses a sulfur trioxide production device which comprises an evaporator, the spraying tower comprises an air inlet and an air outlet, the spraying tower is arranged at the rear section of the evaporator, the evaporator is communicated with the air inlet of the spraying tower, the spraying tower further comprises an evaporation section and a spraying section, and the spraying section is located above the evaporation section; the input end of the condenser is communicated with the air outlet of the spray tower; gaseous sulfur trioxide output from the gas outlet enters the condenser and then is cooled into liquid sulfur trioxide, and then the liquid sulfur trioxide flows back to the spraying section of the spraying tower to be sprayed out. Liquid SO output from the condenser is transferred to the reflux tank for temporary storage through the condenser, the reflux tank and the reflux pump, and a part of liquid SO in the reflux tank is circulated back to the system to be used as reflux acid through the reflux pump, so that cyclic extraction of SO is realized, foams, sulfur dioxide and acid mist particles entrained in SO can be removed, and the extraction efficiency of SO is improved. Therefore, the finished product meets the quality requirement.

Description

Technical Field

[0001] The utility model belongs to the technical field of sulfur trioxide production, and particularly relates to a sulfur trioxide production device. Background Art

[0002] In the sulfuric acid workshop of a chemical company, the process adopted by the sulfur trioxide device is that the finished 40% niacin enters the tube side of the niacin evaporator and is reversely heated and evaporated by the steam from the shell side in the evaporator. The generated SO3 gas is cooled after evaporation to form liquid SO3 and enters the SO3 intermediate tank. However, due to the large amount of entrained foam, high sulfur dioxide content, and small acid mist particles during the evaporation process, the existing demisters cannot remove them efficiently, and it can no longer meet the current production requirements, which is not conducive to the long-term and efficient operation of the device. Content of the Utility Model

[0003] In view of the problems in the prior art, the utility model proposes the following technical solutions:

[0004] The utility model provides a sulfur trioxide production device, including:

[0005] An evaporator;

[0006] A spray tower, the spray tower includes an air inlet and an air outlet, the spray tower is arranged at the rear section of the evaporator and the evaporator is communicated with the air inlet of the spray tower. The spray tower further includes an evaporation section and a spray section, and the spray section is located above the evaporation section;

[0007] A condenser, the input end of the condenser is communicated with the air outlet of the spray tower;

[0008] The gaseous sulfur trioxide output from the air outlet is cooled into liquid sulfur trioxide after entering the condenser and then flows back to be sprayed out from the spray section of the spray tower.

[0009] As a preference of the above technical solution, it further includes a reflux tank and a reflux pump. The reflux tank and the reflux pump are sequentially arranged at the rear section of the condenser. The liquid sulfur trioxide cooled in the condenser is transferred to the reflux tank. The reflux pump includes an output channel 1, and the output channel 1 of the reflux pump pumps the sulfur trioxide in the reflux tank to the spray section of the spray tower.

[0010] As a preference of the above technical solution, it further includes a finished product tank. The reflux pump further includes an output channel 2, and the output channel 2 is communicated with the finished product tank.

[0011] As a preference of the above technical solution, a finished product pump and a high-level tank are sequentially arranged at the rear section of the finished product tank.

[0012] The beneficial effects of the utility model are as follows:

[0013] The utility model transfers the liquid SO output from the condenser to the reflux tank for temporary storage through the provided condenser, reflux tank, reflux pump, and the output channels 1 and 2 of the reflux pump. A part of the liquid SO in the reflux tank is recycled back to the system as reflux acid through the reflux pump, and the other part of the liquid SO enters the finished product tank isolated from iron ions through a fluorine tube isolated from iron ions for storage, realizing the cyclic extraction of SO, and can remove the foam, sulfur dioxide, and acid mist particles entrained in the SO, so that the finished product meets the quality requirements. Description of the Drawings

[0014] Figure 1 The figure shows a schematic structural diagram of the production device in the embodiment;

[0015] Reference numerals: 11, evaporator; 20, spray tower; 21, air inlet; 22, air outlet; 23, evaporation section; 24, spray section; 26, condenser; 27, reflux tank; 28, reflux pump; 31, finished product tank; 32, finished product pump; 33, elevated tank. Detailed Embodiments

[0016] To make the objectives, technical solutions, and advantages of the embodiments of the utility model clearer, the technical solutions of the utility model will be clearly and completely described below in conjunction with the embodiments.

[0017] Embodiment

[0018] As Figure 1 shown, Figure 1 The figure shows a schematic structural diagram of the production device in the embodiment;

[0019] This device includes:

[0020] Evaporator 11;

[0021] Spray tower 20, the spray tower 20 includes an air inlet 21 and an air outlet 22, the spray tower 20 is arranged in the rear section of the evaporator 11 and the evaporator 11 is communicated with the air inlet 21 of the spray tower 20, the spray tower 20 further includes an evaporation section 23 and a spray section 24, and the spray section 24 is located above the evaporation section 23;

[0022] Condenser 26, the input end of the condenser 26 is communicated with the air outlet 22 of the spray tower 20;

[0023] The gaseous sulfur trioxide output from the air outlet 22 is cooled into liquid sulfur trioxide in the condenser 26 and then refluxed to the spray section 24 of the spray tower 20 for spraying.

[0024] Liquid SO3 is heated into gaseous SO3 in the evaporator 11 and enters from the air inlet 21 of the spray tower 20. The spray tower 20 also includes a packing section. Liquid SO3 also enters the top of the packing section of the spray tower 20 and flows downward along the packing, coming into countercurrent contact with the upward-flowing gaseous SO3 for washing extraction. The foam and acid mist particles entrained in the gaseous SO3 are washed away, and a certain amount of SO3 is extracted. The extracted liquid SO3 is heated into gaseous SO3 in the evaporation section 23 at the lower part of the spray tower 20. The extracted gaseous SO3 is then cooled into liquid SO3 by the condenser 26. This part of the liquid SO3 is recycled back to the spray tower 20 and sprayed out from the spray section 24.

[0025] In addition, a vent pipe is provided at the outlet of the condenser 26, so that the non-condensable gas SO2 is sent to the tail gas treatment system. By setting the condenser 26, the cyclic extraction of SO3 is realized, and the foam, sulfur dioxide and acid mist particles entrained in the SO3 can be removed, so that the finished product meets the quality requirements.

[0026] As Figure 1 shown, Figure 1 the figure shows the structural schematic diagram of the production device in the embodiment;

[0027] It also includes a reflux tank 27 and a reflux pump 28. The reflux tank 27 and the reflux pump 28 are arranged in sequence at the rear section of the condenser 26. The cooled liquid sulfur trioxide in the condenser 26 is transferred to the reflux tank 27. The reflux pump 28 includes an output channel 1. The output channel 1 of the reflux pump 28 pumps the sulfur trioxide in the reflux tank 27 to the spray section 24 of the spray tower 20.

[0028] It also includes a finished product tank 31. The reflux pump 28 also includes an output channel 2, and the output channel 2 is communicated with the finished product tank 31.

[0029] By setting the reflux tank 27, the reflux pump 28, the output channel 1 and the output channel 2 of the reflux pump 28, the liquid SO3 output from the condenser 26 is transferred to the reflux tank 27 for temporary storage. And through the reflux pump 28, a part of the liquid SO3 in the reflux tank 27 is recycled back to the system as reflux acid, and the other part of the liquid SO3 enters the finished product tank 31 which is also isolated from iron ions through a fluorine pipe isolated from iron ions for storage.

[0030] A finished product pump 32 and a high-level tank 33 are sequentially arranged at the rear section of the finished product tank 31.

[0031] The finished product pump 32 transfers the product temporarily stored in the finished product tank 31 to the high-level tank 33 for subsequent processing.

[0032] Working principle: Gaseous SO3 enters through the air inlet 21 of the spray tower 20, and the gaseous SO3 comes into countercurrent contact with the liquid SO3 flowing downward along the packing for washing and extraction. The gaseous SO3 after extraction is then cooled into a liquid state by the condenser 26. The liquid SO3 cooled in the condenser 26 is transferred to the reflux tank 27, and a part of the SO3 in the reflux tank 27 is pumped to the spray section 24 of the spray tower 20 through the first output channel of the reflux pump 28. The SO3 enters the finished product tank 31 which is also isolated from iron ions through a fluorine tube isolated from iron ions through the second output channel of the reflux pump 28 for storage. Finally, the product temporarily stored in the finished product tank 31 is transferred to the high-level tank 33 for subsequent processing.

[0033] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting it.

Claims

1. Sulfur trioxide production device, characterized in that, Comprising: An evaporator (11); A spray tower (20), the spray tower (20) comprising an air inlet (21) and an air outlet (22), the spray tower (20) being disposed at the rear stage of the evaporator (11) and the evaporator (11) being in communication with the air inlet (21) of the spray tower (20), the spray tower (20) further comprising an evaporation section (23) and a spray section (24), the spray section (24) being located above the evaporation section (23); A condenser (26), the input end of the condenser (26) being in communication with the air outlet (22) of the spray tower (20); The gaseous sulfur trioxide output from the air outlet (22) is cooled into liquid sulfur trioxide after entering the condenser (26) and then flows back to be sprayed out from the spray section (24) of the spray tower (20).

2. The sulfur trioxide production device according to claim 1, characterized in that, It further comprises a reflux tank (27) and a reflux pump (28), the reflux tank (27) and the reflux pump (28) being sequentially disposed at the rear stage of the condenser (26), the liquid sulfur trioxide cooled in the condenser (26) being transferred to the reflux tank (27), the reflux pump (28) comprising an output channel one, and the output channel one of the reflux pump (28) pumping the sulfur trioxide in the reflux tank (27) to the spray section (24) of the spray tower (20).

3. The sulfur trioxide production device according to claim 2, characterized in that, It further comprises a finished product tank (31), the reflux pump (28) further comprising an output channel two, and the output channel two being communicated to the finished product tank (31).

4. The sulfur trioxide production device according to claim 3, characterized in that, A finished product pump (32) and a high-level tank (33) are sequentially disposed at the rear stage of the finished product tank (31).

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