A device and process for extracting sulfur foam from the top of a desulfurization regeneration tower or regeneration tank

Abstract

A sulfur foam extraction device and process at the top of a desulfurization regeneration tower or regeneration tank, wherein the top structure of the desulfurization regeneration tower or regeneration tank includes an outer shell and a tower body, wherein the interlayer space between the outer shell and the tower body forms an outer annular channel, and an inner cylinder of the jacket structure is provided with a sulfur foam outlet, and a sulfur foam overflow weir is provided inside the inner cylinder, wherein the bottom end of the sulfur foam overflow weir is sealed and fixed below the sulfur foam outlet, and an inner annular channel is formed between the sulfur foam overflow weir and the inner cylinder, wherein the sulfur foam outlet is connected to a sulfur foam pump, wherein the outlet of the sulfur foam pump is divided into two paths, one path for delivering sulfur foam, and the other path for connecting to the inner annular channel through a reflux pipeline; a desulfurization liquid outlet is provided on the inner cylinder and below the sulfur foam overflow weir, and the desulfurization liquid outlet is connected to the outer annular channel. The present invention separates the desulfurization liquid and sulfur foam through the device according to the amount of sulfur actually produced by the desulfurization of coal gas, thereby obtaining a stable and continuous sulfur foam liquid of a specific concentration, and at the same time avoids the blockage of the sulfur foam system.

Description

Technical Field

[0001] The invention relates to the field of coke oven gas wet oxidation desulfurization, and in particular to a sulfur foam extracting device and process at the top of a desulfurization regeneration tower or regeneration tank. Background Art

[0002] The wet oxidation desulfurization process is widely used in the coke oven gas purification process due to its advantages of high desulfurization and dehydrogenation efficiency, simple process and simple operation. Its desulfurization regeneration is divided into two process methods: high tower compressed air regeneration and jet self-priming air regeneration. Regardless of which of the above regeneration process methods, the method of raising sulfur foam is to raise sulfur foam liquid (usually 40g~120g / l) by adjusting the height difference between the liquid level of desulfurization liquid and the liquid level of sulfur foam through the float-type liquid level gauge on the upper part of the regeneration tower or regeneration tank. However, the concentration of the raised sulfur foam is not only related to the height difference between the liquid level of desulfurization liquid and the liquid level of sulfur foam, but also to the amount of sulfur and the state of foam. , defoaming effect, etc. Therefore, it is difficult to accurately control the sulfur concentration by adjusting the height difference between the liquid level of the desulfurization liquid and the liquid level of the sulfur foam through a float-type liquid level gauge. The extracted sulfur foam flows by gravity to the foam tank and often causes system blockage. In the past, the sulfur foam was mainly used for melting sulfur or filtering to obtain crude sulfur, and the concentration change of the sulfur foam had no substantial effect on subsequent operations. However, with the increasingly stringent environmental protection requirements, it has become a major trend to burn the sulfur in the sulfur foam and the secondary salt in the liquid to produce acid. Therefore, the sulfur foam produced by the regeneration tower or regeneration tank must contain a stable and specific proportion of sulfur content to meet the requirements of the subsequent sulfur slurry acid-making system. Summary of the invention

[0003] The purpose of the present invention is to provide a sulfur foam extraction device and process at the top of a desulfurization regeneration tower or regeneration tank, which can obtain a stable sulfur foam liquid containing a specific concentration (10g to 150g / l) of sulfur by controlling the sulfur foam extraction amount according to the amount of sulfur produced by the coal gas desulfurization system through a specific method (equipment structure) to meet the needs of subsequent sulfur slurry incineration and acid production, and realize the stable sulfur foam liquid with a set sulfur concentration through real-time automatic control.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A sulfur foam extraction device at the top of a desulfurization regeneration tower or a regeneration tank, wherein the top structure of the desulfurization regeneration tower or the regeneration tank comprises an outer shell and a tower body, wherein the outer shell and the tower body constitute a jacket structure, wherein the interlayer space between the outer shell and the tower body forms an outer annular channel, wherein a sulfur foam outlet is provided on the tower body, and a sulfur foam overflow weir is provided inside the tower body, wherein the bottom end of the sulfur foam overflow weir is sealed and fixed below the sulfur foam outlet, and the upper end of the sulfur foam overflow weir is higher than the sulfur foam outlet, wherein an inner annular channel is formed between the sulfur foam overflow weir and the tower body, wherein the sulfur foam outlet is connected to a sulfur foam pump through a pipeline, wherein the outlet of the sulfur foam pump is divided into two paths, wherein one path delivers sulfur foam, and the other path is connected to the inner annular channel through a reflux pipeline; wherein a desulfurization liquid outlet is provided on the tower body and below the sulfur foam overflow weir, wherein the desulfurization liquid outlet is connected to the outer annular channel, and a desulfurization liquid discharge outlet is provided at the bottom of the outer annular channel.

[0006] The desulfurized liquid outlet is connected to a desulfurized liquid overflow pipe, and the desulfurized liquid overflow pipe is arranged in the outer annular channel. The outlet of the desulfurized liquid overflow pipe is not lower than the upper surface of the sulfur foam overflow weir.

[0007] A flow controller is arranged on the pipeline for delivering sulfur foam of the sulfur foam pump.

[0008] A sulfur foam extraction process of a sulfur foam extraction device at the top of a desulfurization regeneration tower or a regeneration tank, specifically comprising:

[0009] 1) The regenerated desulfurization liquid coming up from the bottom of the desulfurization regeneration tower or the regeneration tank overflows from the desulfurization liquid overflow pipe into the outer annular channel and is discharged from the desulfurization liquid discharge port at the bottom of the outer annular channel;

[0010] 2) The sulfur foam of the regenerated desulfurization liquid coming up from the bottom of the desulfurization regeneration tower or the regeneration tank goes up together with the regeneration air, and the sulfur foam overflows through the sulfur foam overflow weir and flows into the inner annular channel. The sulfur foam in the inner annular channel is pumped out from the sulfur foam outlet and enters the sulfur foam pump;

[0011] 3) A part of the sulfur foam pumped out by the sulfur foam pump is controlled by a flow controller to obtain a sulfur foam liquid with a specific sulfur content, and the other part is returned to the inner circulation channel through a reflux pipe for circulation, so that the sulfur foam liquid in the inner annular channel flows continuously and stably to prevent blockage due to sulfur precipitation in the sulfur foam liquid.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] The invention separates the desulfurized liquid and the sulfur foam according to the actual amount of sulfur produced by desulfurization of coal gas, thereby obtaining a stable and continuous sulfur foam liquid with a specific concentration, and avoiding the blockage of the sulfur foam system. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1The present invention is a structural schematic diagram of a sulfur foam extracting device at the top of a desulfurization regeneration tower or a regeneration tank.

[0015] Figure 2 yes Figure 1 AA view.

[0016] In the figure: 1-regeneration tower or regeneration tank top, 1-1 sulfur foam outlet, 1-2 reflux pipeline, 1-3 sulfur foam overflow weir, 1-4 desulfurization liquid overflow pipe, 1-5 desulfurization liquid discharge outlet, 1-6 desulfurization liquid outlet, 2-sulfur foam pump, 3-flow controller, 4-outer annular channel, 5-inner annular channel, 6-sulfur foam, 7-tower body, 8-desulfurization liquid, 9-external sulfur foam, 10-circulating reflux desulfurization liquid, 11-outer shell. DETAILED DESCRIPTION

[0017] The embodiments of the present invention are further described below in conjunction with the accompanying drawings:

[0018] like Figure 1-Figure 2 As shown, a sulfur foam extracting device at the top of a desulfurization regeneration tower or regeneration tank, the structure of the top 1 of the desulfurization regeneration tower or regeneration tank includes an outer shell 11 and a tower body 7, the outer shell 11 and the tower body 7 form a jacket structure, the interlayer space between the outer shell 11 and the tower body 7 forms an outer annular channel 4, a sulfur foam outlet 1-1 is provided on the tower body 7, a sulfur foam overflow weir 1-3 is provided inside the tower body 7, the bottom end of the sulfur foam overflow weir 1-3 is sealed and fixed below the sulfur foam outlet 1-1, and the upper end of the sulfur foam overflow weir 1-3 is sealed and fixed below the sulfur foam outlet 1-1. Above the sulfur foam outlet 1-1, an inner annular channel 5 is formed between the sulfur foam overflow weir 1-3 and the tower body 7. The sulfur foam outlet 1-1 is connected to the sulfur foam pump 2 through a pipeline. The outlet of the sulfur foam pump 2 is divided into two paths, one path sends out sulfur foam, and the other path is connected to the inner annular channel 5 through the reflux pipeline 1-2; a desulfurization liquid outlet 1-6 is provided on the tower body 7 and below the sulfur foam overflow weir 1-3. The desulfurization liquid outlet 1-6 is connected to the outer annular channel 4, and a desulfurization liquid discharge outlet 1-5 is provided at the bottom of the outer annular channel 4.

[0019] The desulfurization liquid outlet 1-6 is connected to the desulfurization liquid overflow pipe 1-4, and the desulfurization liquid overflow pipe 1-4 is arranged in the outer annular channel 4, and the outlet of the desulfurization liquid overflow pipe 1-4 is not lower than the upper surface of the sulfur foam overflow weir 1-3. A plurality of desulfurization liquid outlets 1-6 and desulfurization liquid overflow pipes 1-4 are evenly distributed in the circumferential direction of the tower body 7.

[0020] The height difference between the desulfurization liquid overflow pipe 1-4 and the sulfur foam overflow weir 1-3 is 0-300 mm, and the preferred height difference H is 100 mm.

[0021] The top of the tower body 7 is open, and the top of the outer shell 11 is provided with an exhaust gas discharge outlet.

[0022] A flow controller 3 is provided on the pipeline for delivering the sulfur foam 9 of the sulfur foam pump 2 .

[0023] The present invention separates desulfurization liquid 8 and sulfur foam 6 through two inner and outer annular channels at the top 1 of the regeneration tower or regeneration tank, ensuring that the desulfurization liquid 8 is continuously separated to the outer annular channel 4 for delivery, and the sulfur foam 6 is also simultaneously separated to the inner annular channel 5 for continuous extraction.

[0024] The present invention only provides the structure and process of a novel separation and removal device for desulfurization liquid and sulfur foam at the top of a regeneration tower or regeneration tank, and the other parts of the regeneration tower or regeneration tank are prior art.

[0025] A sulfur foam extraction process of a sulfur foam extraction device at the top of a desulfurization regeneration tower or a regeneration tank, specifically comprising:

[0026] 1) The regenerated desulfurization liquid 8 coming up from the bottom of the desulfurization regeneration tower or the regeneration tank top 1 overflows from the desulfurization liquid overflow pipe 1-4 into the outer annular channel 4, and is discharged from the desulfurization liquid discharge port 1-5 at the bottom of the outer annular channel 4 and sent back to the desulfurization system.

[0027] 2) The sulfur foam 6 of the regenerated desulfurization liquid coming up from the bottom of the desulfurization regeneration tower or the regeneration tank top 1 goes up together with the regeneration air, and the sulfur foam 6 overflows through the sulfur foam overflow weir 1-3 and flows into the inner annular channel 5, and the sulfur foam 6 in the inner annular channel 5 is pumped out from the sulfur foam outlet 1-1 and enters the sulfur foam pump 2;

[0028] 3) A part of the sulfur foam from the sulfur foam pump 2 is sent out by the flow controller 3 to control the extraction amount so as to obtain sulfur foam liquid with a specific sulfur content, and the other part is returned to the inner annular channel 5 through the reflux pipe 1-2 for circulation, so that the sulfur foam 6 liquid in the inner annular channel 5 flows continuously and stably to prevent blockage due to sulfur precipitation in the sulfur foam 6 liquid;

[0029] According to the amount of sulfur regenerated from the desulfurization liquid, the amount of sulfur foam liquid extracted from the top of the regeneration tank or regeneration tower is controlled to control its sulfur concentration. If the amount of sulfur foam liquid extracted is reduced, the sulfur foam concentration will increase, and if the amount of sulfur foam liquid extracted is increased, the sulfur foam concentration will decrease.

[0030] 4) The regenerated exhaust gas is discharged from the upper outlet.

[0031] The sulfur content of the sulfur foam liquid delivered in step 3) is controlled within the range of 10 g to 150 g / l, preferably 50 g / l. The sulfur particles in the sulfur foam liquid are in the range of several to several tens of microns.

[0032] Although the above describes the specific implementation mode of the invention in conjunction with the drawings, it is not intended to limit the scope of protection of the invention. Based on the technical solution of the present invention, various modifications or variations that can be made by those skilled in the art without creative work are still within the scope of protection of the present invention.

Claims

1. A sulfur foam extraction device at the top of a desulfurization regeneration tower or regeneration tank, wherein the top structure of the desulfurization regeneration tower or regeneration tank comprises a shell and a tower body, wherein the shell and the tower body form a jacket structure, and the interlayer space between the shell and the tower body forms an outer annular channel, characterized in that: A sulfur foam outlet is provided on the tower body, and a sulfur foam overflow weir is provided inside the tower body. The bottom end of the sulfur foam overflow weir is sealed and fixed below the sulfur foam outlet, and the upper end of the sulfur foam overflow weir is higher than the sulfur foam outlet. An inner annular channel is formed between the sulfur foam overflow weir and the tower body. The sulfur foam outlet is connected to a sulfur foam pump through a pipeline, and the outlet of the sulfur foam pump is divided into two paths, one path sends out sulfur foam, and the other path is connected to the inner annular channel through a reflux pipeline; a desulfurization liquid outlet is provided on the tower body and below the sulfur foam overflow weir, and the desulfurization liquid outlet is connected to the outer annular channel, and a desulfurization liquid discharge outlet is provided at the bottom of the outer annular channel.

2. The sulfur foam extraction device at the top of a desulfurization regeneration tower or regeneration tank according to claim 1, characterized in that: The desulfurized liquid outlet is connected to a desulfurized liquid overflow pipe, and the desulfurized liquid overflow pipe is arranged in the outer annular channel. The outlet of the desulfurized liquid overflow pipe is not lower than the upper surface of the sulfur foam overflow weir.

3. The sulfur foam extracting device at the top of a desulfurization regeneration tower or regeneration tank according to claim 1, characterized in that: A flow controller is arranged on the pipeline for delivering sulfur foam of the sulfur foam pump.

4. A sulfur foam extraction process using the sulfur foam extraction device at the top of a desulfurization regeneration tower or regeneration tank as claimed in any one of claims 1 to 3, characterized in that: Specifically include: 1) The regenerated desulfurization liquid coming up from the bottom of the desulfurization regeneration tower or the regeneration tank overflows from the desulfurization liquid overflow pipe into the outer annular channel and is discharged from the desulfurization liquid discharge port at the bottom of the outer annular channel; 2) The sulfur foam of the regenerated desulfurization liquid coming up from the bottom of the desulfurization regeneration tower or the regeneration tank goes up together with the regeneration air, and the sulfur foam overflows through the sulfur foam overflow weir and flows into the inner annular channel. The sulfur foam in the inner annular channel is pumped out from the sulfur foam outlet and enters the sulfur foam pump; 3) A part of the sulfur foam pumped out by the sulfur foam pump is controlled by a flow controller to obtain a sulfur foam liquid with a specific sulfur content, and the other part is returned to the inner circulation channel through a reflux pipe for circulation, so that the sulfur foam liquid in the inner annular channel flows continuously and stably to prevent blockage due to sulfur precipitation in the sulfur foam liquid.

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