Reducing valve rear cylinder of pulverized coal gasification flash evaporation system and pulverized coal gasification flash evaporation system

Abstract

The utility model relates to a pressure reducing valve rear barrel of a pulverized coal gasification flash evaporation system and the pulverized coal gasification flash evaporation system.The pressure reducing valve rear barrel of the pulverized coal gasification flash evaporation system comprises a first pipe body, a second pipe body and an outer wear-resisting structure, and the first pipe body is constructed to be used for introducing black water subjected to pressure reduction treatment; the second pipe body is connected with the pipe wall of the first pipe body, the second pipe body and the first pipe body are communicated with each other so as to discharge black water in the first pipe body, and the axis of the first pipe body and the axis of the second pipe body are arranged at an included angle; the outer wear-resisting structure is arranged on the outer cylinder wall of the joint of the first pipe body and the second pipe body in a surrounding mode. According to the rear cylinder of the pressure reducing valve, the position, mainly abraded by black water, of the cylinder is thickened through the outer abrasion-resistant structure arranged at the joint of the first pipe body and the second pipe body in a surrounding mode, black water leakage caused by serious abrasion of the cylinder is prevented, the pressure and the flow speed of the black water in the cylinder are not affected, the running time of a device is prolonged, and the service life of the device is prolonged. The device inspection and maintenance frequency is reduced, and the service life of equipment is prolonged.

Description

Technical Field

[0001] The present disclosure relates to the technical field of coal chemical industry, and in particular to a pressure reducing valve rear cylinder of a pulverized coal gasification flash evaporation system and a pulverized coal gasification flash evaporation system. Background Art

[0002] At present, in the flash evaporation process of coal chemical black water, due to the high pressure in the flash tank, the flow rate of black water through the cylinder behind the pressure reducing valve is high, which seriously scours the cylinder wall behind the pressure reducing valve. In addition, there are solid particles such as coal dust in the black water and acidic gases produced by flash evaporation, which further wear and corrode the cylinder wall behind the pressure reducing valve. The cylinder wears out very quickly, not only does it need to stop production frequently for inspection and maintenance, but there is also the risk of leakage due to severe wear, which causes great inconvenience to the company's production.

[0003] In the prior art, a wear-resistant layer is usually added inside the cylinder to deal with cylinder wear. However, adding the wear-resistant layer reduces the internal space of the cylinder and increases the black water pressure and flow rate, so the service life of the cylinder behind the pressure reducing valve is relatively limited. Utility Model Content

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a pressure reducing valve rear cylinder of a pulverized coal gasification flash evaporation system and a pulverized coal gasification flash evaporation system that extend the service life of the pressure reducing valve rear cylinder.

[0005] In a first aspect, a pressure reducing valve rear cylinder of a pulverized coal gasification flash evaporation system disclosed in the present invention comprises:

[0006] a first pipe body, wherein the first pipe body is configured to allow black water after decompression treatment to pass therein;

[0007] A second tube body, the second tube body is connected to the tube wall of the first tube body, and the second tube body and the first tube body are interconnected to discharge the black water in the first tube body, and the axes of the first tube body and the second tube body are arranged at an angle to each other;

[0008] The outer wear-resistant structure is disposed around the outer tube wall at the connection between the first tube body and the second tube body.

[0009] In one embodiment, the axes of the first tube body and the second tube body of the present disclosure are arranged at an angle of 90° to each other.

[0010] In one embodiment, the first tube body of the present disclosure includes:

[0011] A main cylinder body, the main cylinder body having a first opening end and a second opening end arranged opposite to the first opening end, the black water flows into the first tube body through the first opening end;

[0012] an end cover connected to the main cylinder to block the second open end;

[0013] The second tube body is disposed between the first opening end and the second opening end.

[0014] In one embodiment, an inner wear-resistant layer is provided on the inner wall of the main cylinder and / or the inner wall of the second tube body of the present disclosure.

[0015] In one embodiment, the first tube body of the present disclosure further includes a wear-resistant plate, the inner wear-resistant layer of the main cylinder is provided with a raised limiting ring, the wear-resistant plate is arranged in the main cylinder and is pressed against the limiting ring by the end cover.

[0016] In one embodiment, the wear plate of the present disclosure is a casting.

[0017] In one embodiment, the end cover and the second open end of the main cylinder body of the present disclosure are provided with an outer flange and a mounting hole provided on the outer flange, and the main cylinder body and the end cover are fixedly connected by fasteners adapted to the mounting hole.

[0018] In one embodiment, the thickness of the inner wear-resistant layer of the present disclosure is 30 mm, and the thickness of the outer wear-resistant structure is 80 mm.

[0019] In a second aspect, the present disclosure provides a pulverized coal gasification flash system, the pulverized coal gasification flash system comprising:

[0020] Flash tank;

[0021] a pressure reducing valve, the pressure reducing valve being in communication with the flash tank and configured to reduce the pressure of the black water after flash evaporation in the flash tank;

[0022] The rear cylinder of the pressure reducing valve is connected to the pressure reducing valve and is configured to discharge the black water after the pressure reducing treatment of the pressure reducing valve. The rear cylinder of the pressure reducing valve is the rear cylinder of the pressure reducing valve as described in any of the above embodiments.

[0023] In one embodiment, the flash tank of the present disclosure includes a high-pressure flash tank, a low-pressure flash tank and a vacuum flash tank which are sequentially arranged along the flow direction of the black water.

[0024] One beneficial effect of the pressure reducing valve rear cylinder of the pulverized coal gasification flash system disclosed in the present invention is that the pressure reducing valve rear cylinder of the present invention is thickened at the cylinder position where the flash black water is mainly worn by the external wear-resistant structure arranged around the connection between the first tube body and the second tube body, so as to prevent the flash black water from leaking due to severe wear of the cylinder body. In addition, in the prior art, a wear-resistant layer is usually added inside the pressure reducing valve rear cylinder body to protect the cylinder body from wear, but after the wear-resistant layer is added inside, the internal space of the cylinder body is reduced, and the pressure and flow rate of the flash black water entering the cylinder body are increased, making the flash black water wear the cylinder body more seriously, while the external wear-resistant structure has no effect on the internal space of the cylinder body, and thus has no effect on the pressure and flow rate of the black water in the cylinder body. Therefore, compared with adding a wear-resistant layer inside the cylinder body, the external wear-resistant structure is more effective in solving the problem of flash black water leakage caused by severe wear of the cylinder body.

[0025] In addition, the rear cylinder of the pressure reducing valve disclosed in the present invention also includes an inner wear-resistant layer and a wear-resistant plate, which protects the cylinder wall and the second open end of the first tube body, improves the operating time of the device, reduces the frequency of device inspection and maintenance, and extends the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0027] Figure 1 It is a structural schematic diagram of a rear cylinder of a pressure reducing valve provided in one embodiment of the present disclosure;

[0028] Figure 2 It is a schematic diagram of a pulverized coal gasification flash evaporation system provided in one embodiment of the present disclosure.

[0029] Figure 1 and Figure 2 The one-to-one correspondence between the component names and the figure marks is as follows: 1-first tube body; 11-main cylinder body; 12-end cover; 2-second tube body; 3-external wear-resistant structure; 4-inner wear-resistant layer; 41-limiting ring; 5-wear-resistant plate. DETAILED DESCRIPTION

[0030] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present disclosure unless otherwise specifically stated.

[0031] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present disclosure, its application, or uses.

[0032] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0033] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0034] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0035] In this document, “upper”, “lower”, “front”, “back”, “left”, “right”, etc. are only used to indicate the relative position relationship between related parts, rather than to limit the absolute positions of these related parts.

[0036] In this article, "first", "second", etc. are only used to distinguish each other, and do not indicate the importance and order, or the premise of each other's existence.

[0037] In this document, “equal”, “same”, etc. are not strictly limited in a mathematical and / or geometric sense, but also include errors that can be understood by those skilled in the art and are allowed in manufacturing or use.

[0038] The existing pressure reducing valve rear cylinder wears out quickly and has a short service life. Therefore, the present invention provides a pulverized coal gasification flash evaporation system. Figure 1 , Figure 2 , the specific structure and working principle of the pulverized coal gasification flash evaporation system disclosed in the present invention are described in detail in combination with embodiments.

[0039] Combination Figure 1 In one embodiment, the rear cylinder of the pressure reducing valve of the pulverized coal gasification flash system disclosed in the present invention includes a first tube body 1, a second tube body 2, and an external wear-resistant structure 3, wherein the first tube body 1 is configured to allow the black water after the pressure reduction treatment to pass through; the second tube body 2 is connected to the tube wall of the first tube body 1, and the second tube body 2 and the first tube body 1 are interconnected to discharge the black water in the first tube body 1, and the axes of the first tube body 1 and the second tube body 2 are arranged at an angle to each other; the external wear-resistant structure 3 is arranged around the outer cylinder wall at the connection between the first tube body 1 and the second tube body 2.

[0040] Specifically, the first tube body 1 and the second tube body 2 can be made of stainless steel, which has good corrosion resistance and stability. The axes of the first tube body 1 and the second tube body 2 are arranged at an angle to each other, so that the flashed black water can change the flow direction and reduce the impact of the high-pressure flashed black water on the flash tank. After the flashed black water passes through the pressure reducing valve, the black water vaporizes and expands, and the flow rate increases. Under the action of the two-phase flow, the connection between the first tube body 1 and the second tube body 2 is severely worn. The outer wear-resistant structure 3 is covered on the outer cylinder wall at the connection between the first tube body 1 and the second tube body 2. The outer wear-resistant structure 3 does not change the space in the cylinder, and has no effect on the pressure and flow rate of the flashed black water entering the cylinder. Compared with adding a wear-resistant layer inside, it can effectively prevent the black water leakage at the connection between the first tube body 1 and the second tube body 2, and extend the service life of the equipment.

[0041] The outer wear-resistant structure 3 can be made of stainless steel. Stainless steel not only has good corrosion resistance and stability, but also has excellent weldability and can be applied to most fusion welding methods. The outer wear-resistant structure 3 is welded to the outer tube wall at the connection between the first tube body 1 and the second tube body 2.

[0042] In this embodiment, the axes of the first tube body 1 and the second tube body 2 of the present disclosure are arranged at an angle of 90° to each other.

[0043] Specifically, the axes of the first tube body 1 and the second tube body 2 are arranged at an angle of 90° to each other, so that the flash black water can be circulated in a linear manner, which can effectively achieve a buffering effect on the high-pressure flash black water and reduce the impact of the high-pressure flash black water on the flash tank. Tubes arranged at an angle of 90° are common on the market. Considering the principle of interchangeability and the serious scouring of the first tube body 1 and the second tube body 2 by the flash black water, the axes of the first tube body 1 and the second tube body 2 are arranged at an angle of 90° to each other, which facilitates the subsequent replacement of the tube bodies.

[0044] In this embodiment, the first tube body 1 disclosed herein includes a main cylinder body 11 and an end cover 12, wherein the main cylinder body 11 has a first opening end and a second opening end arranged opposite to the first opening end, and black water flows into the first tube body 1 through the first opening end; the end cover 12 is connected to the main cylinder body 11 to seal the second opening end; and the second tube body 2 is arranged between the first opening end and the second opening end.

[0045] Specifically, the flashed black water enters the first tube body 1 through the first open end of the main cylinder body 11. Since the end cover 12 is fixed to the main cylinder body 11, the flashed black water is buffered at the second open end opposite to the first open end, and then discharged from the second tube body 2 between the first open end and the second open end. The second open end is the main flushing position of the flashed black water, and has the function of buffering the flashed black water to prevent the first tube body 1 from being worn and corroded.

[0046] In this embodiment, an inner wear-resistant layer 4 is provided on the inner wall of the main cylinder body 11 and the inner wall of the second tube body 2 of the present disclosure.

[0047] Specifically, the inner wear-resistant layer 4 can be made of a ceramic wear-resistant layer such as aluminum oxide or silicon oxide, or an alloy wear-resistant layer. The ceramic wear-resistant layer has high wear resistance and can be applied to high temperature and high pressure environments, and the alloy wear-resistant layer has good mechanical strength.

[0048] In this embodiment, the first tube body 1 of the present disclosure further includes a wear-resistant plate 5 , the inner wear-resistant layer 4 of the main cylinder 11 is provided with a raised limiting ring 41 , the wear-resistant plate 5 is arranged in the main cylinder 11 and is pressed against the limiting ring 41 by the end cover 12 .

[0049] Specifically, since the second open end is the location where flash black water is mainly flushed, the wear-resistant plate 5 is arranged in the second open end to effectively protect the first tube body 1 from being worn. Due to the high pressure and fast flow rate of flash black water, the raised limit ring 41 of the inner wear-resistant layer 4 and the end cover 12 clamp the wear-resistant plate 5, so that the wear-resistant plate 5 is fixed to the second open end to avoid being washed away by the flash black water and losing the protective effect on the first tube body 1. When the wear-resistant plate 5 is severely worn and needs to be replaced, the pulverized coal gasification flash system can be stopped, the end cover 12 can be opened, and after the wear-resistant plate 5 is replaced, the end cover 12 can be re-pressed on the new wear-resistant plate 5 to fix the wear-resistant plate 5 relative to the first tube body 1.

[0050] In this embodiment, the wear-resistant plate 5 disclosed herein is a casting.

[0051] Specifically, the wear-resistant plate 5 is most severely worn, so the wear-resistant plate 5 needs to be checked and replaced frequently, and the use of castings is low-cost.

[0052] In this embodiment, the end cover 12 and the second open end of the main cylinder 11 of the present disclosure are provided with an outer flange and a mounting hole provided on the outer flange, and the main cylinder 11 and the end cover 12 are fixedly connected by fasteners adapted to the mounting hole.

[0053] Specifically, the end cover 12 needs to press the wear-resistant plate 5 against the limit ring 41 to prevent it from being washed away by the flashed black water, so the end cover 12 is fixedly connected to the main cylinder 11 by fasteners and flanges. The fasteners can be bolts and gaskets. The flange connection method can be easily disassembled and installed, which is convenient for equipment maintenance.

[0054] In this embodiment, the thickness of the inner wear-resistant layer 4 of the present disclosure is 30 mm, and the thickness of the outer wear-resistant structure 3 is 80 mm.

[0055] Specifically, the thickness of the inner wear-resistant layer 4 will affect the size of the space in the pipe body. The greater the thickness, the smaller the space in the pipe body, the greater the pressure and flow rate of the flash black water flowing into the pipe body, and the greater the wear on the inner wall of the pipe body. Therefore, the thickness of the inner wear-resistant layer 4 should not be too large. The outer wear-resistant structure 3 can be thickened to prevent the flash black water from leaking.

[0056] In this embodiment, the pulverized coal gasification flash system disclosed herein includes a flash tank, a pressure reducing valve, and a cylinder behind the pressure reducing valve, wherein the pressure reducing valve is connected to the flash tank and is configured to discharge black water after flash treatment in the pressure reducing flash tank; the cylinder behind the pressure reducing valve is connected to the pressure reducing valve and is configured to discharge black water after pressure reducing treatment by the pressure reducing valve, and the cylinder behind the pressure reducing valve is the cylinder behind the pressure reducing valve as described in any of the above embodiments.

[0057] Specifically, the pulverized coal gasification flash evaporation system can realize the entire process of increasing the solid content in black water and analyzing acidic gases.

[0058] In this embodiment, the flash tank disclosed herein comprises a high-pressure flash tank, a low-pressure flash tank and a vacuum flash tank which are sequentially arranged along the flow direction of the black water.

[0059] Specifically, the three-stage flash evaporation design can further increase the solid content in black water and analyze acidic gases.

[0060] In another embodiment, the rear cylinder of the pressure reducing valve of the pulverized coal gasification flash system disclosed in the present invention has all the structures of the rear cylinder of the pressure reducing valve as described in the above embodiment, but the difference is that the nominal diameter of the first pipe body 1 is increased by 1.25 times from the original DN400 to DN500, and the height is lengthened to 1.9 meters; the nominal diameter of the second pipe body 2 is increased by 1.5 times from the original DN400 to DN600.

[0061] Specifically, as the internal space of the first tube body 1 and the second tube body 2 is expanded, the pressure and flow rate of the flash black water flowing into the tube body are reduced, the wear on the inner wall of the tube body is reduced, and the influence of the thickness of the inner wear-resistant layer 4 on the pressure and flow rate of the flash black water is eliminated, thereby extending the service life of the equipment.

[0062] The working process of the pulverized coal gasification flash evaporation system disclosed in the present invention is described in detail below in combination with actual working scenarios.

[0063] The raw coal is prepared into pulverized coal or water-coal slurry and then gasified in a gasifier. The high-temperature gas is quenched and washed to produce a large amount of black water (temperature: 200°C, pressure: 4.0MPa).

[0064] 1. Start the pulverized coal gasification flash system, and let the black water (temperature: 200℃, pressure: 4.0MPa) enter the cylinder behind the pressure reducing valve after the pressure reducing valve is reduced, enter from the first opening end of the first pipe body 1, contact the wear-resistant plate 5 at the second opening end to be buffered, enter the second pipe body 2, and be sent to the high-pressure flash tank for flash evaporation;

[0065] 2. The black water (temperature: 158°C, pressure: 0.5MPa) after flash evaporation in the high-pressure flash evaporator is decompressed through the pressure reducing valve and enters the cylinder behind the pressure reducing valve, enters from the first opening end of the first tube body 1, is buffered after contacting the wear-resistant plate 5 at the second opening end, enters the second tube body 2, and is sent to the low-pressure flash evaporator for flash evaporation;

[0066] 3. The black water (temperature: 120°C, pressure: 0.13MPa) after flashing in the low-pressure flash tank is decompressed through the pressure reducing valve and enters the cylinder behind the pressure reducing valve, enters from the first opening end of the first tube body 1, is buffered after contacting the wear-resistant plate 5 at the second opening end, enters the second tube body 2, and is sent to the vacuum flash tank to further flash out the acid gas dissolved therein. The gas at the top after flashing enters the deaerator for heating treatment.

[0067] The embodiments of the present disclosure have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The choice of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the marketplace, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein. The scope of the present disclosure is defined by the appended claims.

Claims

1. A pressure reducing valve rear cylinder of a pulverized coal gasification flash system, characterized in that: The rear cylinder of the pressure reducing valve comprises: A first pipe body (1), wherein the first pipe body (1) is configured to allow black water that has been subjected to a decompression treatment to pass therein; A second tube body (2), the second tube body (2) being connected to the tube wall of the first tube body (1), and the second tube body (2) and the first tube body (1) being communicated with each other so as to discharge the black water in the first tube body (1), and the axes of the first tube body (1) and the second tube body (2) being arranged at an angle to each other; An external wear-resistant structure (3), the external wear-resistant structure (3) is arranged around the outer tube wall at the connection between the first tube body (1) and the second tube body (2).

2. The rear cylinder of the pressure reducing valve according to claim 1, characterized in that: The axes of the first tube body (1) and the second tube body (2) are arranged at an angle of 90° to each other.

3. The rear cylinder of the pressure reducing valve according to claim 1, characterized in that: The first tube (1) comprises: A main cylinder (11), the main cylinder (11) having a first opening end and a second opening end arranged opposite to the first opening end, the black water flows into the first tube body (1) through the first opening end; an end cover (12), the end cover (12) being connected to the main cylinder (11) to seal the second open end; The second tube body (2) is arranged between the first opening end and the second opening end.

4. The rear cylinder of the pressure reducing valve according to claim 3, characterized in that: An inner wear-resistant layer (4) is provided on the inner wall of the main cylinder (11) and / or the inner wall of the second tube (2).

5. The rear cylinder of the pressure reducing valve according to claim 4, characterized in that: The first tube body (1) further comprises a wear-resistant plate (5); the inner wear-resistant layer (4) of the main cylinder body (11) is provided with a raised limiting ring (41); the wear-resistant plate (5) is arranged inside the main cylinder body (11) and is pressed against the limiting ring (41) by the end cover (12).

6. The rear cylinder of the pressure reducing valve according to claim 5, characterized in that: The wear-resistant plate (5) is a casting.

7. The rear cylinder of the pressure reducing valve according to claim 3, characterized in that: The end cover (12) and the second open end of the main cylinder (11) are provided with an outer flange and a mounting hole provided on the outer flange, and the main cylinder (11) and the end cover (12) are fixedly connected by a fastener adapted to the mounting hole.

8. The rear cylinder of the pressure reducing valve according to claim 4, characterized in that: The thickness of the inner wear-resistant layer (4) is 30 mm, and the thickness of the outer wear-resistant structure (3) is 80 mm.

9. A pulverized coal gasification flash system, characterized in that: The pulverized coal gasification flash system comprises: Flash tank; a pressure reducing valve, the pressure reducing valve being in communication with the flash tank and configured to reduce the pressure of the black water after flash treatment in the flash tank; A rear cylinder of the pressure reducing valve, which is connected to the pressure reducing valve and is configured to discharge black water after the pressure reducing treatment of the pressure reducing valve. The rear cylinder of the pressure reducing valve is the rear cylinder of the pressure reducing valve according to any one of claims 1 to 8.

10. The pulverized coal gasification flash system according to claim 9, characterized in that: The flash tank comprises a high-pressure flash tank, a low-pressure flash tank and a vacuum flash tank which are sequentially arranged along the flow direction of the black water.

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