Desulfurization solution regeneration system

Abstract

The utility model relates to the technical field of water gas wet oxidation desulfurization, in particular to a desulfurization solution regeneration system, which comprises a cooling tower, a desulfurization tower, a rich liquor tank, a desulfurization regeneration tank, a barren liquor tank, a foam barrel and a sulfur melting kettle, the desulfurization regeneration tank is respectively communicated with a barren liquor tank and a foam barrel through pipelines, the barren liquor tank is communicated with a desulfurization tower through a pipeline, the foam barrel is communicated with a sulfur melting kettle through a pipeline, a heating device is arranged in the rich liquor tank, and a steam inlet of the heating device is communicated with a steam outlet of the sulfur melting kettle. According to the utility model, the steam after sulfur melting is used for heating the regeneration solution, so that the regeneration temperature is controlled, the waste heat is fully recycled, the device is safe and environment-friendly, and the energy is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of water-gas wet oxidation desulfurization, in particular to a desulfurization solution regeneration system. Background Art

[0002] Wet oxidation desulfurization is to absorb the acidic gas H2S with alkaline substances (such as soda ash or ammonia water), and at the same time select an appropriate oxidation catalyst to oxidize the H2S absorbed by the neutralization reaction into elemental sulfur through a regeneration tank, separate it, and smelt it into sulfur, so that the desulfurization solution can be regenerated.

[0003] The temperature of the regeneration solution has a great influence on sulfur regeneration. A high regeneration temperature will intensify the side reactions, resulting in a faster sulfur precipitation reaction and fine sulfur particles, which is not conducive to flotation. A low regeneration temperature will result in low regeneration efficiency. At the same time, a small amount of alkali crystals will precipitate in the solution, resulting in a low total alkali content in the solution, which will affect the adsorption of the solution. The system solution temperature is generally 35-42 ℃. The regeneration solution temperature is adjusted by adjusting the cooling tower water volume to control the desulfurization tower inlet gas temperature.

[0004] In the prior art, the regeneration temperature regulation mainly relies on the heat transfer of the gas temperature. In winter, the temperature drops. In order to increase the regeneration temperature, the water supply to the cooling tower needs to be reduced. Although the increase in gas temperature can drive the regeneration temperature to increase, the water gas will condense a large amount of water while rapidly transferring heat and cooling, resulting in a rapid increase in the volume of the regeneration solution, poor liquid quality, unqualified alkalinity, and poor regeneration effect. Summary of the invention

[0005] The utility model aims to solve the problem that the prior art relies on gas temperature heat transfer to control the regeneration temperature, and water gas will condense a large amount of water while rapidly transferring heat and cooling, resulting in a rapid increase in the volume of the regenerated solution, poor liquid quality, unqualified alkalinity, and poor regeneration effect. A desulfurization solution regeneration system is provided, which controls the regeneration temperature by heating the regeneration solution with steam from molten sulfur. The regeneration temperature is no longer adjusted by adjusting the gas temperature, thereby reducing the introduction of condensed water and improving the regeneration effect.

[0006] In order to achieve the above purpose, the technical solution of the utility model is:

[0007] A desulfurization solution regeneration system comprises a cooling tower, a desulfurization tower, a desulfurization regeneration tank, a lean liquid tank, a foam barrel and a molten sulfur kettle, wherein the cooling tower, the desulfurization tower and the desulfurization regeneration tank are connected in sequence through pipelines, the desulfurization regeneration tank is also connected to the lean liquid tank and the foam barrel through a pipeline, the lean liquid tank is connected to the desulfurization tower through a pipeline, the foam barrel is connected to the molten sulfur kettle through a pipeline, and the molten sulfur kettle is provided with a filtrate outlet and a steam outlet.

[0008] Furthermore, a rich liquid tank is provided on the pipeline between the desulfurization tower and the desulfurization regeneration tank, the liquid inlet of the rich liquid tank is connected to the desulfurization tower through a pipeline, the liquid outlet of the rich liquid tank is connected to the desulfurization regeneration tank through a pipeline, and a heating device is provided in the rich liquid tank. The heating device heats the solution in the rich liquid tank.

[0009] Furthermore, the heating device includes a steam inlet and a steam outlet, and a curved heating pipeline is provided between the steam inlet and the steam outlet to increase the heat exchange area between the steam and the solution in the rich liquid tank and improve the solution heating efficiency.

[0010] Furthermore, the steam inlet of the heating device is connected to the steam outlet of the sulfur melting kettle. The steam in the sulfur melting kettle is used to heat the solution in the rich liquid tank, making full use of the waste heat, being safe, environmentally friendly and saving energy.

[0011] Furthermore, a stop valve is provided at the steam inlet of the heating device, and the stop valve controls the amount of steam passing through the rich liquid tank.

[0012] Furthermore, a rich liquid pump is provided on the pipeline between the rich liquid tank and the desulfurization regeneration tank to pump the solution in the rich liquid tank into the desulfurization regeneration tank.

[0013] Furthermore, a lean liquid pump is provided between the lean liquid tank and the desulfurization tower, and a foam pump is provided between the foam barrel and the molten sulfur kettle.

[0014] Through the above technical solution, the beneficial effects of the utility model are:

[0015] The utility model adopts a wet oxidation desulfurization process to purify water gas, and obtains sulfur by melting sulfur foam through a sulfur melting kettle, thereby improving the utilization rate of desulfurization liquid and achieving good regeneration effect.

[0016] The utility model utilizes the steam waste heat of the molten sulfur kettle to heat the solution in the rich liquid tank, controls the solution regeneration temperature, fully recycles the waste heat, is safe, environmentally friendly, and saves energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The structure of the utility model is shown in FIG. Figure 1 ;

[0018] Figure 2 The structure of the utility model is shown in FIG. Figure 2 ;

[0019] The numbers in the attached drawings are: 1 is a cooling tower, 2 is a desulfurization tower, 3 is a rich liquid tank, 4 is a desulfurization regeneration tank, 41 is a lean liquid tank, 42 ​​is a foam barrel, and 5 is a molten sulfur kettle. DETAILED DESCRIPTION

[0020] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments:

[0021] like Figure 1-2 As shown, this embodiment provides a desulfurization solution regeneration system, including a cooling tower 1, a desulfurization tower 2, a desulfurization regeneration tank 4, a lean liquid tank 41, a foam barrel 42 and a molten sulfur kettle 5, wherein the cooling tower 1, the desulfurization tower 2 and the desulfurization regeneration tank 4 are connected in sequence through pipelines, the cooling tower 1 is provided with a cooling water inlet and a cooling water outlet, and water gas is introduced into the cooling tower 1, and the water gas enters the desulfurization tower 2 after being cooled in the cooling tower 1; the desulfurization tower 2 is provided with a desulfurization liquid, and the desulfurization liquid undergoes an acid-base neutralization reaction with the acidic gas in the water gas, and adsorbs the sulfide in the water gas, and the pure water gas after desulfurization leaves the desulfurization tower 2, and the desulfurization solution after the reaction enters the desulfurization regeneration tank 4, and a chemical regeneration reaction is carried out in the desulfurization regeneration tank 4.

[0022] The desulfurization solution reacts fully with oxygen to generate sulfur foam. The desulfurization regeneration tank 4 is also connected to the lean liquid tank 41 and the foam barrel 42 through pipelines. The regenerated desulfurization liquid after the regeneration reaction is recovered to the lean liquid tank 41. The lean liquid tank 41 is connected to the desulfurization tower 2 through a pipeline, and the regenerated desulfurization liquid returns to the desulfurization tower 2 for continuous recycling; the sulfur foam enters the foam barrel 42, and the foam barrel 42 is connected to the sulfur melting kettle 5 through a pipeline. The sulfur foam is smelted in the sulfur melting kettle 5 to obtain sulfur. The sulfur melting kettle 5 is provided with a filter outlet and a steam outlet.

[0023] A rich liquid tank 3 is provided on the pipeline between the desulfurization tower 2 and the desulfurization regeneration tank 4. The rich liquid tank 3 is used to store the desulfurization solution after desulfurization. The liquid inlet of the rich liquid tank 3 is connected to the desulfurization tower 2 through a pipeline, and the liquid outlet of the rich liquid tank 3 is connected to the desulfurization regeneration tank 4 through a pipeline. Figure 2 As shown, a heating device is provided in the rich liquid tank 3, and the heating device is used to increase the temperature of the solution in the rich liquid tank 3. In order to promote the smooth progress of the subsequent regeneration reaction, the temperature in the rich liquid tank is controlled at 38° C. to 42° C. Within this temperature range, the regeneration solution has good quality, appropriate alkalinity, and good regeneration effect.

[0024] Specifically, the heating device is a steam heating coil, and the heating device includes a steam inlet and a steam outlet, and a curved heating pipeline is arranged between the steam inlet and the steam outlet. The steam inlet of the heating device is connected to the steam outlet of the molten sulfur kettle 5. The steam outlet of the molten sulfur kettle 5 is connected to the steam inlet of the heating device through a stainless steel pipe, and the steam after use in the molten sulfur kettle 5 is introduced into the heating device of the rich liquid tank 3 for heating, so as to fully recycle and utilize the waste heat and save energy.

[0025] In order to control the amount of steam entering the rich liquid tank 3, a stop valve is provided at the steam inlet of the heating device, and the stop valve is a prior art.

[0026] In order to ensure smooth transmission of liquid, a rich liquid pump is provided between the rich liquid tank 3 and the desulfurization regeneration tank 4. A lean liquid pump is provided between the lean liquid tank 41 and the desulfurization tower 2, and a foam pump is provided between the foam barrel 42 and the molten sulfur kettle 5. In this embodiment, the rich liquid pump, the lean liquid pump and the foam pump are all centrifugal pumps.

[0027] Working principle:

[0028] The water gas to be desulfurized enters the cooling tower 1, and after being cooled in the cooling tower 1, enters the desulfurization tower 2, reacts with the desulfurization liquid in the desulfurization tower 2, and the pure water gas after desulfurization is discharged from the desulfurization tower 2. The desulfurized liquid after the reaction enters the rich liquid tank 3, where it is heated up, and then is pumped into the desulfurization regeneration tank 4. The desulfurized liquid fully reacts with oxygen in the desulfurization regeneration tank 4, and the generated sulfur foam enters the foam barrel 42. The regenerated desulfurized liquid returns to the desulfurization tower 2 through the lean liquid tank 41 to continue to be recycled, and finally the sulfur foam is smelted in the sulfur melting kettle 5 to obtain sulfur.

[0029] The embodiments described above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made based on the structures, features and principles described in the patent scope of the present invention should be included in the patent application scope of the present invention.

Claims

1. A desulfurization solution regeneration system, comprising a cooling tower (1), a desulfurization tower (2), a desulfurization regeneration tank (4), a lean liquid tank (41), a foam barrel (42) and a sulfur melting kettle (5), It is characterized in that The cooling tower (1), the desulfurization tower (2) and the desulfurization regeneration tank (4) are connected in sequence through pipelines. The desulfurization regeneration tank (4) is also connected to the lean liquid tank (41) and the foam barrel (42) through pipelines. The lean liquid tank (41) is connected to the desulfurization tower (2) through a pipeline. The foam barrel (42) is connected to the molten sulfur kettle (5) through a pipeline. The molten sulfur kettle (5) is provided with a filtrate outlet and a steam outlet.

2. A desulfurization solution regeneration system according to claim 1, It is characterized in that A rich liquid tank (3) is also provided on the pipeline between the desulfurization tower (2) and the desulfurization regeneration tank (4); the liquid inlet of the rich liquid tank (3) is connected to the desulfurization tower (2) through a pipeline, and the liquid outlet of the rich liquid tank (3) is connected to the desulfurization regeneration tank (4) through a pipeline; a heating device is provided in the rich liquid tank (3).

3. A desulfurization solution regeneration system according to claim 2, It is characterized in that The heating device comprises a steam inlet and a steam outlet, and a curved heating pipeline is arranged between the steam inlet and the steam outlet.

4. A desulfurization solution regeneration system according to claim 3, It is characterized in that The steam inlet of the heating device is connected to the steam outlet of the molten sulfur kettle (5).

5. A desulfurization solution regeneration system according to claim 3, It is characterized in that A stop valve is provided at the steam inlet of the heating device.

6. A desulfurization solution regeneration system according to claim 2, It is characterized in that A rich liquid pump is provided on the pipeline between the rich liquid tank (3) and the desulfurization regeneration tank (4).

7. A desulfurization solution regeneration system according to claim 1, It is characterized in that A lean liquid pump is provided between the lean liquid tank (41) and the desulfurization tower (2), and a foam pump is provided between the foam barrel (42) and the molten sulfur kettle (5).

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