Automatic oil removal system for wet desulfurization slurry

Abstract

The application provides a kind of wet desulfurization slurry automatic oil removal system.The wet desulfurization slurry automatic oil removal system of the application comprises desulfurization tower, solid-liquid separator, air float tank, oil separator and filtrate recovery tank arranged and connected in sequence, and the solid-liquid separator is provided with thick slurry outlet and overflow port, the air float tank is provided with filtrate distributor and air distributor, the thick slurry outlet and overflow port of the solid-liquid separator are communicated with the desulfurization tower and the filtrate distributor respectively, the air distributor is connected with aeration fan, the oil separator is divided into left chamber and right chamber by partition, the left chamber is communicated with the bottom of the right chamber, the top of the left chamber is provided with telescopic oil drain pipe, the right chamber is communicated with the filtrate recovery tank through overflow port, and the filtrate recovery tank is communicated with the desulfurization tower through filtrate return pipeline.The wet desulfurization slurry automatic oil removal system of the application realizes the separation and recovery of filtrate and oil in oil-containing desulfurization slurry, which is conducive to solving the problems of desulfurization slurry pollution and desulfurization efficiency reduction.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil removal, in particular to a wet desulfurization slurry automatic oil removal system. BACKGROUND

[0002] With the continuous advancement of new power system construction, the proportion of installed capacity of thermal power generating units is continuously decreasing, the load of thermal power generating units participating in peak shaving is continuously decreasing, the number of start-stop of thermal power generating units is significantly increasing, and the annual average oil running time of thermal power generating units is getting longer and longer. Since the desulfurization device matched with the thermal power generating unit does not have a bypass, the oil mist that is not completely combusted during oil injection of the unit will enter the wet desulfurization tower with the flue gas and continuously accumulate, resulting in adverse consequences such as foaming of the desulfurization tower slurry, poisoning of the slurry pollution, difficulty in dehydration of the gypsum slurry, and reduction of desulfurization efficiency, which seriously affects the safe and stable operation of the desulfurization system.

[0003] In order to ensure that the thermal power generating unit better plays the peak shaving function under the new power system, reduce the influence of oil injection of the unit on the operation of the rear-end desulfurization system, and improve the operation efficiency, safety and stability of the desulfurization system, it is necessary to remove oil from the oil-polluted desulfurization slurry.

[0004] In view of this, the present application is proposed. SUMMARY

[0005] The present application aims to provide a wet desulfurization slurry automatic oil removal system, which realizes separation and recovery of filtrate and oil in oil-containing desulfurization slurry, and is beneficial to solve problems such as desulfurization slurry pollution and reduction of desulfurization efficiency.

[0006] The present application provides a wet desulfurization slurry automatic oil removal system, which comprises a desulfurization tower, a solid-liquid separator, a gas float tank, an oil separator and a filtrate recovery tank which are sequentially arranged and connected, a thick slurry outlet and an overflow port are arranged on the solid-liquid separator, a filtrate distributor and an air distributor are arranged in the gas float tank, the thick slurry outlet and the overflow port of the solid-liquid separator are in communication with the desulfurization tower and the filtrate distributor respectively, the air distributor is connected with an aeration fan, the oil separator is divided into a left chamber and a right chamber by a partition, the left chamber is in communication with the bottom of the right chamber, an extendable oil discharge pipe is arranged at the top of the left chamber, the right chamber is in communication with the filtrate recovery tank through the overflow port, and the filtrate recovery tank is in communication with the desulfurization tower through a filtrate return pipeline.

[0007] Further, the slurry discharge port of the desulfurization tower is connected with the slurry inlet port of the solid-liquid separator through a slurry inlet pipe, and the horizontal position of the slurry discharge port is higher than that of the slurry inlet port.

[0008] Further, the upper part and the lower part of the solid-liquid separator are cylindrical and inverted conical respectively, a liquid level meter and a central cylinder are arranged on the upper part of the solid-liquid separator, the upper part of the central cylinder is communicated with the slurry discharge port of the desulfurization tower through a slurry inlet pipe, the bottom of the central cylinder extends to the lower part of the solid-liquid separator, a thick slurry outlet is arranged on the bottom of the lower part of the solid-liquid separator, the thick slurry outlet is communicated with the desulfurization tower through a thick slurry return pipeline, and a screw pump is arranged on the thick slurry return pipeline.

[0009] Further, liquid distribution openings uniformly distributed along the cross section of the air floatation tank are arranged on the filtrate distributor, and air distribution openings uniformly distributed along the cross section of the air floatation tank are arranged on the air distributor, and the air distributor is located above the filtrate distributor.

[0010] Further, an overflow port is arranged on the upper part of the air floatation tank, and a liquid inlet is arranged on the upper part of the left chamber, the overflow port of the air floatation tank is communicated with the liquid inlet of the left chamber through a liquid inlet pipe, and the horizontal position of the overflow port of the air floatation tank is higher than that of the liquid inlet of the left chamber.

[0011] Further, a communication passage with a height of 200-500 mm is arranged on the bottom of the partition, and the left chamber and the right chamber are communicated through the communication passage.

[0012] Further, a liquid level meter is arranged on the top of the left chamber, a transparent oil level viewer is arranged on the panel of the left chamber, and a telescopic oil discharge pipe is connected with an oil discharge pump.

[0013] Further, a liquid level meter is arranged on the top of the right chamber, and a liquid collecting tank is arranged on the bottom of the right chamber, the liquid collecting tank is communicated with the filtrate recovery tank through an overflow pipe.

[0014] Further, a liquid level meter is arranged on the top of the filtrate recovery tank, and a filtrate return pump is arranged on the filtrate return pipeline.

[0015] Further, the height of the overflow port of the right chamber is calculated by the following formula:

[0016]

[0017] Wherein, h1 is the height of the overflow port of the right chamber, h2 is the height of the liquid inlet of the left chamber, h4 is the height of the communication passage, ρ 油 is the density of oil, ρ 滤液 is the density of filtrate.

[0018] The automatic oil removal system of the wet desulfurization slurry of the application first utilizes the solid-liquid separator to perform solid-liquid separation on the oil-containing desulfurization slurry, the concentrated slurry formed by the solid-liquid separation is delivered to the desulfurization tower, thereby avoiding solid deposition and equipment and pipeline blockage in the subsequent treatment process, and improving the effect of the subsequent treatment process; the oil-containing filtrate is uniformly distributed by the filtrate distributor in the air floatation tank, the aeration fan uniformly aerates in the air floatation tank through the air distributor, the emulsified oil in the oil-containing filtrate can be effectively separated from the filtrate and the stratification effect is achieved, which facilitates the subsequent separation and treatment of the oil stain and the filtrate; the oil separator can determine the height of the oil layer in the left chamber according to the liquid level difference between the left chamber and the right chamber, and automatically discharge oil by starting the oil discharge pump according to the oil layer height, and the telescopic oil discharge pipe can adjust the height of the oil discharge port according to the oil layer height and the left chamber liquid level height, which not only ensures the effective separation of oil and filtrate, but also maximizes the utilization of the left chamber volume for temporary oil storage; the above-mentioned automatic oil removal system of the wet desulfurization slurry realizes the effective separation of oil in the oil-containing desulfurization slurry, which not only recovers the oil stain in the slurry, reduces the pollution of the slurry, avoids the inconvenience caused by replacing the slurry of the desulfurization system, but also improves the desulfurization efficiency of the desulfurization system, and ensures the stable and reliable operation of the system. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the specific embodiments or prior art of the present application, the drawings needed in the specific embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0020] Figure 1 It is a structural schematic diagram of the automatic oil removal system of the wet desulfurization slurry.

[0021] Figure 2 It is a schematic diagram of water injection before the oil separator is started.

[0022] Figure 3 It is a schematic diagram of the right chamber of the oil separator starting to overflow.

[0023] Figure 4 It is a schematic diagram of the highest oil level in the left chamber of the oil separator.

[0024] Explanation of reference signs:

[0025] 1: desulfurization tower; 11: slurry discharge port;

[0026] 2: solid-liquid separator; 21: liquid level meter; 22: center cylinder; 23: screw pump; 24: slurry inlet pipe; 25: overflow port;

[0027] 3: air floatation tank; 31: liquid inlet pipe; 32: filtrate distributor; 33: air distributor; 34: aeration fan; 35: overflow port;

[0028] 4: oil separator; 41: left chamber; 42: right chamber; 43: liquid inlet; 44: telescopic oil discharge pipe; 45: oil level observer; 46: liquid level meter; 47: oil discharge pump; 48: partition; 49: liquid level meter; 410: overflow port;

[0029] 5: filtrate recovery tank; 51: liquid level meter; 52: filtrate return pump; 53: filtrate return pipeline. DETAILED DESCRIPTION

[0030] It should be noted that the following detailed description is illustrative only and is intended to provide further description of the present application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0031] It should be noted that the terms used herein are merely for the purpose of describing the specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form also includes the plural form unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, there is a presence of the features, steps, operations, devices, components and / or combinations thereof.

[0032] The technical solutions of the present application will be described in detail below in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0033] Example 1

[0034] In conjunction with Figures 1 to 4 As shown in the figure, the automatic oil removal system of the wet desulfurization slurry of the present embodiment comprises a desulfurization tower 1, a solid-liquid separator 2, a flotation tank 3, an oil separator 4 and a filtrate recovery tank 5 which are sequentially arranged and connected, a concentrated slurry outlet and an overflow port 25 are arranged on the solid-liquid separator 2, a filtrate distributor 32 and an air distributor 33 are arranged in the flotation tank 3, the concentrated slurry outlet and the overflow port 25 of the solid-liquid separator 2 are respectively communicated with the desulfurization tower 1 and the filtrate distributor 32, the air distributor 33 is connected with an aeration fan 34, the oil separator 4 is divided into a left chamber 41 and a right chamber 42 by a partition 48, the left chamber 41 is communicated with the bottom of the right chamber 42, a telescopic oil discharge pipe 44 is arranged at the top of the left chamber 41, the right chamber 42 is communicated with the filtrate recovery tank 5 through the overflow port 410, and the filtrate recovery tank 5 is communicated with the desulfurization tower 1 through a filtrate return pipeline 53.

[0035] The desulfurization tower 1 is mainly used for wet desulfurization, and a conventional wet desulfurization device in the art can be used. The desulfurization tower 1 is provided with a slurry discharge port 11 for discharging the oil-containing desulfurization slurry in the desulfurization tower 1 to the solid-liquid separator 2. The desulfurization tower 1 can also be provided with a concentrated slurry inlet and a filtrate inlet. The concentrated slurry inlet is in communication with the solid-liquid separator 2, and the filtrate inlet is in communication with the filtrate recovery tank 5, so as to recycle the concentrated slurry formed by the solid-liquid separator 2 and the filtrate in the filtrate recovery tank 5.

[0036] The solid-liquid separator 2 is mainly used for solid-liquid separation of the oil-containing desulfurization slurry. The solid-liquid separator 2 is provided with a slurry inlet for the oil-containing desulfurization slurry, a concentrated slurry outlet for discharging the concentrated slurry, and an overflow port 25 for discharging the filtrate. The slurry discharge port 11 of the desulfurization tower 1 is connected to the slurry inlet of the solid-liquid separator 2 through a slurry inlet pipe 24. The horizontal position of the slurry discharge port 11 is higher than that of the slurry inlet of the solid-liquid separator 2, so as to allow the oil-containing desulfurization slurry to flow into the solid-liquid separator 2.

[0037] Specifically, the upper part and the lower part of the solid-liquid separator 2 are cylindrical and inverted conical, respectively. The solid-liquid separator 2 is provided with a liquid level meter 21 and a central cylinder 22 at the upper part. The central cylinder 22 is vertically arranged at the central position of the upper part of the solid-liquid separator 2. The upper part of the central cylinder 22 is in communication with the slurry discharge port 11 of the desulfurization tower 1 through the slurry inlet pipe 24. The bottom of the central cylinder 22 extends to the lower part of the solid-liquid separator 2, so as to ensure that the solid smoothly enters the lower part of the solid-liquid separator 2 for sedimentation. The upper end of the central cylinder 22 is about 5-10 mm higher than the lower edge of the overflow port 25 of the solid-liquid separator 2, so as to ensure that the upper layer of oil stains directly enters the space between the upper part of the central cylinder 22 and the side wall of the solid-liquid separator 2. The concentrated slurry outlet is arranged at the bottom of the lower part of the solid-liquid separator 2. The concentrated slurry outlet is in communication with the desulfurization tower 1 through a concentrated slurry return pipeline. A screw pump 23 is arranged on the concentrated slurry return pipeline. The screw pump 23 is used for conveying the concentrated slurry to the desulfurization tower 1.

[0038] The oil-containing desulfurization slurry is self-flowed into the inlet of the solid-liquid separator 2 from the desulfurization tower 1 through the slurry outlet 11, and is introduced into the central cylinder 22 through the connecting pipeline. By using the density difference between the oil dirt and the slurry, most of the oil dirt is overflowed to the upper part of the liquid surface between the central cylinder 22 and the side wall of the solid-liquid separator 2 from the upper part of the central cylinder 22. The solid-containing slurry is separated from the liquid from top to bottom in the central cylinder 22. When passing through the lower end of the central cylinder 22, the solid continues to settle into the lower cone of the solid-liquid separator 2 to form a thick slurry with high solid content. The thick slurry is discharged from the thick slurry outlet at the bottom of the solid-liquid separator 2, and is pressurized and transported back to the desulfurization tower 1 by the screw pump 23. The desulfurization slurry passing through the lower end of the central cylinder 22 flows from bottom to top between the central cylinder 22 and the side wall of the solid-liquid separator 2. Due to the increase in cross-sectional area, the flow rate of the slurry is greatly reduced, and the small particle solids and liquid in the slurry are separated from the liquid. The solid continues to settle into the lower cone of the solid-liquid separator 2, and is transported to the desulfurization tower 1 together with the solid settled in the central cylinder 22. The filtrate with very low solid content in the desulfurization slurry is introduced into the air floatation tank 3 through the overflow port 25 of the solid-liquid separator 2. The solid-liquid separator 2 is used to separate the oil-containing desulfurization slurry, and the thick slurry formed by the solid-liquid separation is transported to the desulfurization tower 1 for reuse, avoiding the solid deposition and the blockage of equipment and pipelines in the subsequent treatment process, and improving the effect of the subsequent treatment process.

[0039] The air floatation tank 3 is mainly used for air floatation of the filtrate after solid-liquid separation. The air floatation tank 3 is provided with a liquid inlet for the filtrate to enter and an overflow port 35 for the filtrate after air floatation to flow out. The liquid inlet is connected with the overflow port 25 of the solid-liquid separator 2 through a liquid inlet pipe 31. The air floatation tank 3 is provided with a filtrate distributor 32 and an air distributor 33. The air distributor 33 is located above the filtrate distributor 32. The air distributor 33 is provided with liquid distribution ports uniformly distributed along the cross section of the air floatation tank 3. The air distributor 33 is in communication with an air blower 34 for supplying air required for air floatation of the filtrate. The air distribution ports of the air distributor 33 are also uniformly distributed along the cross section of the air floatation tank 3.

[0040] The filtrate separated by solid-liquid separation enters the lower part of the filter tank 3 through a pipeline, and is uniformly distributed by the filtrate distributor 32 in the filter tank 3. The air distributor 33 uniformly distributes the air delivered by the aeration blower 34 in the cross section of the filter tank 3, and disperses and sprays the air to form small bubbles. The small bubbles move upwards in the filter tank 3, and the emulsified oil and small suspended matters in the filtrate adhere to the bubbles and float to the liquid surface with the bubbles, so that the oil and the filtrate are separated, and the mixed liquid after the separation of the oil and the filtrate is discharged from the overflow port 35 of the filter tank 3 to the oil separator 4. The emulsified oil in the filtrate is effectively separated from the filtrate by the uniform distribution of the filtrate in the filter tank 3 by the filtrate distributor 32 and the uniform aeration in the filter tank 3 by the air distributor 33, and the separation of the oil and the filtrate is achieved, which facilitates the subsequent separation of the oil and the filtrate.

[0041] The oil separator 4 is mainly used for oil separation. The oil separator 4 is divided into a left chamber 41 and a right chamber 42 by a partition plate 48. The left chamber 41 is provided with a liquid inlet 43 at the upper part. The overflow port 35 of the filter tank 3 is connected to the liquid inlet 43 of the left chamber 41 through a liquid inlet pipe. The horizontal position of the overflow port 35 of the filter tank 3 is higher than that of the liquid inlet 43 of the left chamber 41, so as to ensure the self-flowing force of the filtrate. The left chamber 41 and the right chamber 42 are connected through a communication passage with a height of 200-500 mm at the bottom of the partition plate 48.

[0042] The oil separator 4 is mainly used for oil separation. The oil separator 4 is divided into a left chamber 41 and a right chamber 42 by a partition plate 48. The left chamber 41 is provided with a liquid inlet 43 at the upper part. The overflow port 35 of the filter tank 3 is connected to the liquid inlet 43 of the left chamber 41 through a liquid inlet pipe. The horizontal position of the overflow port 35 of the filter tank 3 is higher than that of the liquid inlet 43 of the left chamber 41, so as to ensure the self-flowing force of the filtrate. The left chamber 41 and the right chamber 42 are connected through a communication passage with a height of 200-500 mm at the bottom of the partition plate 48.

[0043] The oil separator 4 is mainly used for oil separation. The oil separator 4 is divided into a left chamber 41 and a right chamber 42 by a partition plate 48. The left chamber 41 is provided with a liquid inlet 43 at the upper part. The overflow port 35 of the filter tank 3 is connected to the liquid inlet 43 of the left chamber 41 through a liquid inlet pipe. The horizontal position of the overflow port 35 of the filter tank 3 is higher than that of the liquid inlet 43 of the left chamber 41, so as to ensure the self-flowing force of the filtrate. The left chamber 41 and the right chamber 42 are connected through a communication passage with a height of 200-500 mm at the bottom of the partition plate 48.

[0044] In combination Figure 2As shown, before the oil-containing filtrate after air floatation enters the oil separator 4 through the liquid inlet 43, a certain height of water is first added to the bottom of the oil separator 4, and the water level height needs to be higher than the upper edge of the bottom communication channel of the left chamber 41 and the right chamber 42 by more than 500 mm, so as to ensure that when the oil-containing filtrate enters the left chamber 41, the upper layer of oil stains will not enter the right chamber 42.

[0045] In combination Figure 3 As shown, after the oil-containing filtrate enters the left chamber 41 through the liquid inlet 43, the oil stains in the left chamber 41 float in the upper part of the left chamber 41 by using the density difference between the filtrate and the oil stains, and the filtrate is located in the lower part of the left chamber 41. With the continuous entry of the oil-containing filtrate into the left chamber 41, the liquid level of the right chamber 42 first reaches the lower edge of the overflow port 410 to form overflow of the filtrate.

[0046] In combination Figure 4 As shown, with the continuous addition of the oil-containing filtrate to the left chamber 41, the filtrate is continuously discharged from the overflow port 410 of the oil separator 4, and the height of the oil layer in the upper part of the left chamber 41 is continuously increased until it rises to the lower edge of the liquid inlet 43 of the oil separator 4. At this time, the maximum oil level height of the oil separator 4 has been reached, and the liquid addition needs to be stopped. The telescopic oil discharge pipe 44 is adjusted to the oil layer height, and the oil discharge pump 47 is started to discharge oil. With the continuous oil discharge, the oil level height is continuously reduced, and the oil discharge port height of the telescopic oil discharge pipe 44 needs to be adjusted in real time during the oil discharge process to ensure that the oil discharge port is located in the oil layer. In order to ensure that only oil stains are discharged during oil discharge, a certain height of oil layer can be reserved at the end of oil discharge.

[0047] In the structural design of the oil separator 4, according to the principle of pressure balance at the same height position of the bottom of the left chamber 41 and the right chamber 42, the maximum oil layer height h3 is calculated through the following formula:

[0048]

[0049] Wherein: h3 is the maximum oil layer height, h2 is the height of the liquid inlet of the left chamber, h1 is the height of the overflow port of the right chamber, p 油 is the density of oil, p 滤液 is the density of filtrate.

[0050] The maximum oil layer height h3 depends on the height difference between the lower edge of the liquid inlet 43 of the left chamber 41 and the lower edge of the overflow port 410 of the right chamber 42 according to the above formula due to the certain density difference between the filtrate and the oil. In order to make the space of the left chamber 41 be used for temporary storage of the oil dirt to the greatest extent, the height space between the upper edge of the communication passage of the left chamber 41 and the lower edge of the liquid inlet 43 of the left chamber 41 can be theoretically used as the oil storage space. In order to ensure that the oil dirt does not enter the right chamber 42 to cause the oil dirt to escape, the height space between 1.0 meter above the upper edge of the communication passage of the left chamber 41 and the lower edge of the liquid inlet 43 of the left chamber 41 can be used as the oil storage space. At this time, the maximum oil layer height h3 = h2-1.0-h4, and the height h1 of the overflow port of the right chamber can be calculated and determined according to the maximum oil layer height h3 through the following formula:

[0051]

[0052] Wherein, h1 is the height of the overflow port of the right chamber, h2 is the height of the liquid inlet of the left chamber, h4 is the height of the communication passage, p 油 is the density of the oil, and p 滤液 is the density of the filtrate.

[0053] The oil separator 4 can determine the height of the oil layer in the left chamber 41 according to the liquid level difference between the left chamber 41 and the right chamber 42, and automatically start the oil discharge pump 47 according to the oil layer height to perform automatic oil discharge. Meanwhile, the telescopic oil discharge pipe 44 can adjust the oil discharge port height according to the oil layer height and the liquid level height of the left chamber 41, which not only ensures the effective separation of the oil and the filtrate, but also maximizes the temporary storage of the oil in the left chamber 41.

[0054] The filtrate recovery tank 5 is mainly used for recovering the filtrate after oil separation. A liquid level meter 51 is arranged at the top of the filtrate recovery tank 5 to measure and display the liquid level height of the filtrate recovery tank 5 in real time. A filtrate return pump 52 is arranged on the filtrate return pipeline 53 to start and stop the filtrate return pump 52 according to the liquid level height in the filtrate recovery tank 5.

[0055] The filtrate in the right chamber 42 of the oil separator 4 flows to the filtrate recovery tank 5 through the overflow pipe 410 of the oil separator 4. The liquid level meter 51 on the filtrate recovery tank 5 measures the liquid level height in the filtrate recovery tank 5 in real time. When the filtrate in the filtrate recovery tank 5 reaches a high liquid level, the filtrate return pump 52 is started to deliver the filtrate to the desulfurization tower 1 for reuse. When the liquid level reaches a low liquid level, the filtrate return pump 52 is closed, so that the automatic control of the filtrate in the filtrate recovery tank 5 returning to the desulfurization tower 1 can be realized according to the liquid level height in the filtrate recovery tank 5.

[0056] The oil in the oil-containing desulfurization slurry is effectively separated by the automatic oil removal system of the wet desulfurization slurry, the oil in the slurry is recovered, the pollution of the slurry is reduced, the inconvenience caused by replacing the slurry of the desulfurization system is avoided, the desulfurization efficiency of the desulfurization system is improved, and the stable and reliable operation of the system is ensured.

[0057] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A wet desulphurization slurry automatic oil removal system, characterized in that, The device comprises a desulfurization tower, a solid-liquid separator, an air float tank, an oil separator and a filtrate recovery tank which are sequentially arranged and connected, the solid-liquid separator is provided with a thick slurry outlet and an overflow port, the air float tank is provided with a filtrate distributor and an air distributor, the thick slurry outlet and the overflow port of the solid-liquid separator are communicated with the desulfurization tower and the filtrate distributor respectively, the air distributor is connected with an aeration fan, the oil separator is divided into a left chamber and a right chamber by a partition, the left chamber is communicated with the bottom of the right chamber, the top of the left chamber is provided with an extendable oil discharge pipe, the right chamber is communicated with the filtrate recovery tank through the overflow port, the filtrate recovery tank is communicated with the desulfurization tower through a filtrate return pipeline, and the height of the overflow port of the right chamber is obtained through the following formula: wherein: h 1 is the height of the right ventricular overflow port, h 2 is the height of the left ventricular inflow port, h 4 is the height of the communication channel, ρ 油 is the density of the oil, The slurry discharge port of the desulfurization tower is connected with the slurry inlet of the solid-liquid separator through a slurry inlet pipe, and the horizontal position of the slurry discharge port is higher than that of the slurry inlet. 滤液 is the density of the filtrate.

2. The automatic oil removal system for wet desulphurization slurry according to claim 1, characterized in that, The upper part and the lower part of the solid-liquid separator are cylindrical and inverted conical respectively, the upper part of the solid-liquid separator is provided with a liquid level meter and a central cylinder, the upper part of the central cylinder is communicated with the slurry discharge port of the desulfurization tower through a slurry inlet pipe, the bottom of the central cylinder extends to the lower part of the solid-liquid separator, the thick slurry outlet is arranged at the bottom of the lower part of the solid-liquid separator, the thick slurry outlet is communicated with the desulfurization tower through a thick slurry return pipeline, and a screw pump is arranged on the thick slurry return pipeline.

3. The automatic oil removal system for wet desulphurization slurry according to claim 1, characterized in that, The filtrate distributor is provided with liquid distribution ports which are uniformly distributed along the cross section of the air float tank, the air distributor is provided with air distribution ports which are uniformly distributed along the cross section of the air float tank, and the air distributor is located above the filtrate distributor.

4. The automatic oil removal system for wet desulphurization slurry according to claim 1, characterized in that, The overflow port is arranged at the upper part of the air float tank, the liquid inlet is arranged at the upper part of the left chamber, the overflow port of the air float tank is communicated with the liquid inlet of the left chamber through a liquid inlet pipe, and the horizontal position of the overflow port of the air float tank is higher than that of the liquid inlet of the left chamber.

5. The automatic oil removal system for wet desulphurization slurry according to claim 1, characterized in that, A communication channel with a height of 200-500 mm is arranged at the bottom of the partition, and the left chamber and the right chamber are communicated through the communication channel.

6. The automatic oil removal system for wet desulphurization slurry according to claim 1, characterized in that, A liquid level meter is arranged at the top of the left chamber, and a transparent oil level viewer is arranged on the panel of the left chamber, and the extendable oil discharge pipe is connected with an oil discharge pump.

7. The automatic oil removal system for wet desulphurization slurry according to claim 1, characterized in that, A liquid level meter is arranged at the top of the right chamber, and a liquid collecting tank is arranged at the bottom of the right chamber, the liquid collecting tank is communicated with the filtrate recovery tank through an overflow pipe.

8. The automatic oil removal system for wet desulphurization slurry according to claim 1, characterized in that, A liquid level meter is arranged at the top of the filtrate recovery tank, and a filtrate return pump is arranged on the filtrate return pipeline.

9. The automatic oil removal system for wet desulphurization slurry according to claim 1, characterized in that, ​

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