Dust removal system

Abstract

The utility model provides a dust removal system. The dust removal system comprises: a washing tower containing a washing liquid for washing the synthesis gas; the Venturi separation tank is communicated with the washing tower through a gas phase pipeline and a liquid phase pipeline; the first venturi scrubber is arranged on the venturi separation tank and is used for scrubbing the synthesis gas; and the three-way assembly is connected with the tail end of the liquid phase pipeline, the three-way assembly comprises a gas guide cylinder which is obliquely arranged upwards, and the gas guide cylinder is used for separating gas in the liquid phase pipeline. According to the utility model, the problem that the washing liquid in the washing tower is easily disturbed by the synthesis gas flowing into the liquid phase pipeline in the prior art is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of dry coal powder gasification, in particular to a dust removal system. Background Art

[0002] In the coal chemical industry, dry pulverized coal gasification technology is an important method for converting coal into usable syngas. Syngas, a key intermediate product in the coal chemical production process, is widely used in the production of chemical products such as synthetic ammonia, methanol, and synthetic oil. However, syngas typically contains a certain amount of dust and impurities. If not effectively controlled, these can affect the stable operation of subsequent processes and product quality. Currently, dust content in the raw syngas of dry pulverized coal gasification units is primarily controlled through syngas scrubbing. The scrubbing system is a key component in syngas purification and primarily consists of a quench ring, downcomer, a primary venturi scrubber, a secondary venturi scrubber, and a syngas scrubber. In the gasifier's syngas scrubbing system, syngas first bubbles through the quench ring, where it comes into contact with quench water, rapidly cooling the gas and initially removing some dust. Subsequently, the syngas enters the primary venturi scrubber, where it comes into contact with high-pressure circulating water for scrubbing, further removing dust and impurities. The scrubbed syngas is separated in a venturi separator, where the majority of the ash is removed. However, during gasifier operation, due to the high volume of syngas, the liquid phase of the Venturi separator tank was prone to cross-flow into the syngas scrubber, which could easily cause fluctuations in the quenching water flow rate and, in turn, cause the gasifier to trip. To address this issue, operators were forced to reduce the regulating valve in the Venturi liquid phase line, but this in turn led to frequent blockages in the Venturi liquid phase line, causing liquid and slag to be carried back into the system during operation. This also posed significant risks and safety hazards when the Venturi separator tank was removed.

[0003] As can be seen from the above, the existing technology has the problem that the synthesis gas that leaks into the liquid phase pipeline easily disturbs the washing liquid in the washing tower. Utility Model Content

[0004] The main purpose of the utility model is to provide a dust removal system to solve the problem in the prior art that the synthesis gas entering the liquid phase pipeline easily disturbs the washing liquid in the washing tower.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a dust removal system, comprising: a washing tower, the washing tower containing a washing liquid, the washing liquid being used to wash the synthesis gas; a venturi separation tank, the venturi separation tank being connected to the washing tower through a gas phase pipeline and a liquid phase pipeline; a first venturi scrubber, the first venturi scrubber being arranged on the venturi separation tank, and being used to wash the synthesis gas; a tee assembly, the tee assembly being connected to the end of the liquid phase pipeline, the tee assembly including an air guide cylinder arranged obliquely upward, the air guide cylinder being used to separate the gas in the liquid phase pipeline.

[0006] Furthermore, the tee assembly also includes an elbow, which bends downward in a direction away from the liquid phase pipeline, and the air guide cylinder is arranged on the elbow.

[0007] Furthermore, the washing tower also includes a baffle, which is arranged in the washing tower and is spaced apart from and corresponding to the air guide cylinder and the bend pipe.

[0008] Furthermore, the dust removal system also includes a second venturi scrubber, which is arranged on the gas phase pipeline and is used to scrub the gas in the gas phase pipeline.

[0009] Furthermore, the dust removal system also includes a tray assembly, which is arranged at the upper part of the washing tower.

[0010] Furthermore, an air inlet and a liquid inlet are provided on the washing tower, a tee assembly is arranged at the liquid inlet, the air inlet and the liquid inlet are arranged below the tower tray assembly, and a gas phase pipeline extends into the air inlet.

[0011] Furthermore, the tower tray assembly includes a first tower tray and a second tower tray, and there are multiple first tower trays and multiple second tower trays, and the multiple first tower trays and the multiple second tower trays are spaced apart in the vertical direction.

[0012] Furthermore, the length of the first tower tray is greater than that of the second tower tray, and two second tower trays are arranged between two adjacent first tower trays among the multiple first tower trays, and the two second tower trays are arranged at intervals.

[0013] Furthermore, the washing tower also includes a demister, an air outlet is opened at the top of the washing tower, and the demister is arranged between the air outlet and the tower tray assembly.

[0014] Furthermore, the upper portion of the gas phase pipeline extends into the scrubbing tower and bends toward each other.

[0015] By applying the technical solution of the present invention, the dust removal system includes a washing tower, a venturi separation tank, a first venturi scrubber and a tee assembly. The washing tower is used to wash the synthesis gas. The venturi separation tank is connected to the washing tower through a gas phase pipeline and a liquid phase pipeline. The first venturi scrubber is arranged on the venturi separation tank and is used to wash the synthesis gas. The tee assembly is connected to the end of the liquid phase pipeline and is used to separate the gas in the liquid phase pipeline. By connecting the tee assembly at the end of the liquid phase pipeline, when the synthesis gas enters the dust removal system, the synthesis gas passes through the first venturi scrubber and the venturi separation tank in sequence, and part of the synthesis gas enters the washing tower along the liquid phase pipeline. The gas in the liquid phase pipeline can be discharged upward by using an air guide cylinder to prevent the synthesis gas entering the washing tower from continuing to flow downward to disturb the washing liquid, thereby solving the problem in the prior art that the synthesis gas entering the liquid phase pipeline easily disturbs the washing liquid in the washing tower. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 The figure shows a schematic structural diagram of a dust removal system in a specific embodiment of the present invention.

[0018] The above drawings include the following reference numerals:

[0019] 10. Scrubber; 20. Venturi separation tank; 30. First Venturi scrubber; 40. Tee assembly; 41. Air guide cylinder; 42. Elbow; 50. Baffle; 60. Second Venturi scrubber; 70. Tray assembly; 71. First tray; 72. Second tray; 80. Defoamer; 90. Gas phase pipeline; 100. Liquid phase pipeline; 110. Downcomer. DETAILED DESCRIPTION

[0020] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0021] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0022] In the present invention, unless otherwise specified, directional words such as "up, down, top, bottom" are usually used with reference to the directions shown in the drawings, or with reference to the components themselves in the vertical, perpendicular or gravity direction; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above directional words are not used to limit the present invention.

[0023] Obviously, the embodiments described above are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0024] In order to solve the problem in the prior art that the synthesis gas entering the liquid phase pipeline easily disturbs the washing liquid in the washing tower, the utility model provides a dust removal system.

[0025] like Figure 1As shown, the dust removal system includes a scrubber 10, a Venturi separator 20, a first Venturi scrubber 30, and a tee assembly 40. The scrubber 10 contains a scrubbing liquid used to scrub the syngas. The Venturi separator 20 is connected to the scrubber 10 via a gas phase line 90 and a liquid phase line 100. The first Venturi scrubber 30 is mounted on the Venturi separator 20 and is used to scrub the syngas. The tee assembly 40 is connected to the end of the liquid phase line 100 and includes an upwardly inclined gas guide 41 for separating the gas in the liquid phase line 100.

[0026] By connecting a tee assembly 40 at the end of the liquid phase pipeline 100, when the synthesis gas enters the dust removal system, the synthesis gas passes through the first venturi scrubber 30 and the venturi separation tank 20 in sequence, and part of the synthesis gas enters the washing tower 10 along the liquid phase pipeline 100. The gas in the liquid phase pipeline 100 can be discharged upward by using the air guide 41 to prevent the synthesis gas entering the washing tower 10 from continuing to flow downward and disturbing the washing liquid.

[0027] like Figure 1 As shown, the tee assembly 40 further includes an elbow 42 , which bends downward in a direction away from the liquid phase pipeline 100 , and the air guide cylinder 41 is disposed on the elbow 42 .

[0028] Specifically, the elbow 42 bends downward to form an arc, and the gas guide 41 is arranged radially along the arc. During operation, the syngas undergoes a second gas-liquid separation in the venturi separator 20. The separated liquid then flows into the scrubber 10 along the liquid phase line 100. Due to the large amount of syngas entering the venturi separator 20, some syngas is contained in the liquid phase line 100. If this cannot be released, it will enter the bottom of the scrubber 10.

[0029] Furthermore, the dust removal system also includes a cold water pump (not shown in the figure). The liquid suction port of the cold water pump is arranged at the bottom of the washing tower 10 and is close to the three-way assembly 40. If the synthesis gas in the liquid phase pipeline 100 cannot be released in advance, it will disturb the washing liquid near the liquid suction port, and even suck the synthesis gas from the liquid suction port into the cold water pump, thereby causing insufficient suction volume of the cold water pump and a vehicle jumping accident; by arranging an air guide cylinder 41, the synthesis gas can be discharged upward to prevent the synthesis gas from disturbing the washing liquid near the liquid suction port or being sucked into the cold water pump.

[0030] At the same time, the traditional method of reducing the flow of the liquid phase pipeline 100 involves closing the regulating valve on the liquid phase pipeline 100, which causes the ash washed by the first venturi scrubber 30 to clog the liquid phase pipeline 100, causing the venturi separation tank 20 to fail, and the synthesis gas to carry liquid and slag into the rear system.

[0031] like Figure 1As shown, the washing tower 10 further includes a baffle 50 , which is disposed inside the washing tower 10 . The baffle 50 is spaced apart from and corresponding to the air guide cylinder 41 and the elbow 42 .

[0032] Specifically, baffle 50 is welded to scrubber 10, and the gas outlets of gas guide cylinder 41 and elbow 42 both face baffle 50. Syngas or separated liquid ejected along elbow 42 behind gas guide cylinder 41 first impacts baffle 50, reducing its flow rate and preventing widespread disturbance of the scrubbing liquid. Optionally, baffle 50 can be curved, allowing the syngas and separated liquid to exit along a curved trajectory, further minimizing the possibility of disturbing the scrubbing liquid.

[0033] In another embodiment of the present application which is not shown in the figure, the baffle 50 is detachably connected to the washing tower so that the baffle 50 can be replaced with a new one after the baffle 50 is worn out after long-term use.

[0034] like Figure 1 As shown, the dust removal system further includes a second venturi scrubber 60 , which is disposed on the gas phase pipeline 90 and is used to scrub the gas in the gas phase pipeline 90 .

[0035] Specifically, particles may still remain in the synthesis gas in the gas phase pipeline 90 after being washed by the first venturi scrubber 30 and the venturi separation tank 20. Further washing the synthesis gas in the gas phase pipeline 90 by the second venturi scrubber 60 can further reduce the particle content in the synthesis gas.

[0036] like Figure 1 As shown, the dust removal system further includes a tray assembly 70 , which is disposed at the upper portion of the washing tower 10 .

[0037] Specifically, the tray assembly 70 is disposed at the upper portion of the scrubbing tower 10 . After being scrubbed by the scrubbing liquid, the synthesis gas flows upward through the tray assembly 70 and is further scrubbed, thereby reducing the solid particle content in the synthesis gas.

[0038] In this embodiment, an air inlet and a liquid inlet are provided on the washing tower 10, a tee assembly 40 is provided at the liquid inlet, the air inlet and the liquid inlet are provided below the tray assembly 70, and a gas phase pipeline 90 extends into the air inlet.

[0039] Specifically, the liquid inlet and the gas inlet are arranged below the tray assembly 70 to meet the needs of multiple washing of the synthesis gas. At the same time, the liquid inlet is arranged below the tray assembly 70 to prevent the separation liquid separated by the venturi separation tank 20 from contaminating the tray assembly 70.

[0040] In the embodiment, a medium pipeline (not shown) is further arranged between the tray assembly 70 and the top of the scrubbing tower 10, through which clean medium is released to the tray assembly 70 to replace the medium on the tray assembly 70, so as to ensure the scrubbing effect of the tray assembly 70.

[0041] As shown in Figure 1 The dust removal system further comprises two downcomers 110 arranged below and on both sides of the tray assembly 70.

[0042] As shown in Figure 1 The tray assembly 70 comprises a plurality of first trays 71 and a plurality of second trays 72, and the plurality of first trays 71 and the plurality of second trays 72 are arranged in the vertical direction.

[0043] In the embodiment, the length of the first tray 71 is greater than that of the second tray 72, and two second trays 72 are arranged between two adjacent first trays 71 in the plurality of first trays 71.

[0044] Specifically, the plurality of first trays 71 are arranged in the vertical direction, and the plurality of first trays 71 are staggered, and the left end of part of the plurality of first trays 71 is connected to the inner wall of the scrubbing tower 10, and the right end of another part of the plurality of first trays 71 is connected to the inner wall of the scrubbing tower 10; two second trays 72 are arranged between two adjacent first trays 71 in the plurality of first trays 71, and the two second trays 72 are arranged in the vertical direction, and one of the two second trays 72 is arranged on the left side of the scrubbing tower 10, and the other is arranged on the right side of the scrubbing tower 10. The plurality of first trays 71 and the plurality of second trays 72 arranged at different positions make the top of the scrubbing tower 10 completely covered by the tray assembly 70, so as to ensure that the synthesis gas passing through the tray assembly 70 is scrubbed.

[0045] Optionally, the first tray 71 and the second tray 72 are both bubble cap trays or fixed valve trays, and of course, they can also be used in combination.

[0046] As shown in Figure 1 The scrubbing tower 10 further comprises a demister 80, and the scrubbing tower 10 is provided with a gas outlet at the top, and the demister 80 is arranged between the gas outlet and the tray assembly 70.

[0047] Specifically, the demister 80 is a cyclone demister, and the demister 80 arranged at the front end of the gas outlet makes the synthesis gas entering the gas outlet gas-liquid separated again.

[0048] In this embodiment, the syngas entering the dust removal system passes through the first venturi scrubber 30, the venturi separation tank 20, the second venturi scrubber 60 and the scrubbing tower 10 and is finally discharged from the gas outlet. This allows the syngas to be scrubbed multiple times, greatly reducing the particle content in the syngas.

[0049] In this embodiment, the upper portion of the gas phase pipeline 90 extends into the scrubbing tower 10 and bends toward each other.

[0050] Specifically, the downwardly bent portion of the gas phase pipeline 90 extends into the scrubbing liquid, thereby injecting the synthesis gas separated by the venturi separation tank 20 into the scrubbing liquid of the scrubbing tower 10 .

[0051] From the above description, it can be seen that the above embodiment of the present invention achieves the following technical effects: by setting the dust removal system including a washing tower 10, a venturi separation tank 20, a first venturi scrubber 30 and a tee assembly 40, the washing tower 10 contains a washing liquid, the washing liquid is used to wash the synthesis gas, the venturi separation tank 20 is connected to the washing tower 10 through a gas phase pipeline 90 and a liquid phase pipeline 100, the first venturi scrubber 30 is arranged on the venturi separation tank 20, and is used to wash the synthesis gas, the tee assembly 40 is connected to the end of the liquid phase pipeline 100, and the tee assembly 40 is connected to the end of the liquid phase pipeline 100. The three-way assembly 40 includes an air guide cylinder 41 arranged obliquely upward. The air guide cylinder 41 is used to separate the gas in the liquid phase pipeline 100. By connecting the three-way assembly 40 to the end of the liquid phase pipeline 100, when the synthesis gas enters the dust removal system, the synthesis gas passes through the first venturi scrubber 30 and the venturi separation tank 20 in sequence, and part of the synthesis gas enters the washing tower 10 along the liquid phase pipeline 100. The air guide cylinder 41 can be used to discharge the gas in the liquid phase pipeline 100 upward to prevent the synthesis gas entering the washing tower 10 from continuing to flow downward to disturb the washing liquid.

[0052] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, tasks, devices, components and / or combinations thereof.

[0053] It should be noted that the terms "upper," "lower," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, such that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0054] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A dust removal system, characterized in that: include: a washing tower (10), wherein the washing tower (10) contains a washing liquid, and the washing liquid is used to wash the synthesis gas; a venturi separation tank (20), the venturi separation tank (20) being in communication with the scrubbing tower (10) via a gas phase pipeline (90) and a liquid phase pipeline (100); a first venturi scrubber (30), the first venturi scrubber (30) being arranged on the venturi separation tank (20) and being used for scrubbing the synthesis gas; A three-way assembly (40) is connected to the end of the liquid phase pipeline (100). The three-way assembly (40) includes a gas guide cylinder (41) arranged obliquely upward, and the gas guide cylinder (41) is used to separate the gas in the liquid phase pipeline (100).

2. The dust removal system according to claim 1, characterized in that: The three-way assembly (40) further comprises a bend (42), wherein the bend (42) bends downward in a direction away from the liquid phase pipeline (100), and the air guide cylinder (41) is arranged on the bend (42).

3. The dust removal system according to claim 2, characterized in that: The washing tower (10) further comprises a baffle (50), wherein the baffle (50) is arranged in the washing tower (10), and the baffle (50) is spaced apart from and corresponding to the air guide cylinder (41) and the bent pipe (42).

4. The dust removal system according to claim 1, characterized in that: The dust removal system further comprises a second venturi scrubber (60), which is arranged on the gas phase pipeline (90) and is used to scrub the gas in the gas phase pipeline (90).

5. The dust removal system according to claim 1, characterized in that: The dust removal system further comprises a tray assembly (70), and the tray assembly (70) is arranged on the upper part of the washing tower (10).

6. The dust removal system according to claim 5, characterized in that: The washing tower (10) is provided with an air inlet and a liquid inlet, the three-way assembly (40) is arranged at the liquid inlet, the air inlet and the liquid inlet are arranged below the tray assembly (70), and the gas phase pipeline (90) extends into the air inlet.

7. The dust removal system according to claim 5, characterized in that: The tray assembly (70) comprises a first tray (71) and a second tray (72), wherein the first tray (71) and the second tray (72) are both plural in number, and the plural first trays (71) and the plural second trays (72) are spaced apart in a vertical direction.

8. The dust removal system according to claim 7, characterized in that: The length of the first tower tray (71) is greater than that of the second tower tray (72); two second tower trays (72) are arranged between two adjacent first tower trays (71) among the plurality of first tower trays (71); and the two second tower trays (72) are arranged at intervals.

9. The dust removal system according to claim 5, characterized in that: The washing tower (10) further comprises a demister (80). An air outlet is provided at the top of the washing tower (10), and the demister (80) is arranged between the air outlet and the tray assembly (70).

10. The dust removal system according to any one of claims 1 to 9, characterized in that: The upper portion of the gas phase pipeline (90) extends into the washing tower (10) and bends toward each other.

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