Coal gasification high-pressure flash tank

Abstract

The utility model relates to the technical field of coal gasification high-pressure flash tanks, in particular to a coal gasification high-pressure flash tank which comprises a tank body, a first water inlet, a second water inlet, a flushing pipe, a liquid outlet, a steam outlet, a plurality of tongue-shaped tower plates, a plurality of sieve plate type tower plates, a plurality of connecting plates, swirl vanes, a plurality of downcomers and baffle plates, according to the high-pressure flash tank, the problems that in the flash evaporation process of an existing high-pressure flash tank, scaling is prone to occurring in an S-shaped baffle plate, a guide plate is prone to being damaged, and flash evaporation steam carries dust and liquid seriously are solved, the baffle plate is not prone to being blocked when the high-pressure flash tank carries out flash evaporation, the phenomenon that the flash evaporation steam carries the dust and the liquid is reduced, and the flash evaporation efficiency is greatly improved.

Description

Technical Field

[0001] This utility model relates to the technical field of high-pressure flash tanks for coal gasification, and in particular to a high-pressure flash tank for coal gasification. Background Technology

[0002] The high-pressure flash tank is a crucial component of the coal gasification system. Black water from the gasifier (270℃, 6.1 MPa) and wastewater from the carbon scrubbing tower (260℃, 6.0 MPa) are fed into the high-pressure flash tank (operating pressure 1.0 MPa, 190℃). The purpose of the high-pressure, high-temperature liquid entering the high-pressure flash tank is to depressurize and cool the liquid through flash evaporation, thereby separating the gas from the high-temperature, high-pressure liquid. The low-temperature water is recycled and reused, while the gas is vented through pipelines to the flare for combustion. The separated gas contains hydrogen sulfide, ammonia, etc., which reduces the sulfur and ammonia content in the gasification water system, lowering the ammonia nitrogen and COD levels in the gasification ash water, thus benefiting the operation of the gasification system.

[0003] However, in daily production, the existing high-pressure flash tanks have a large volume of flash steam, and the flash steam contains some ash and slag. This easily leads to scaling and blockage inside the S-shaped baffle plate at the top of the high-pressure flash tank. Furthermore, the S-shaped baffle plate is difficult to clean. At the same time, the large flash steam flow inside the high-pressure flash tank can easily damage the guide plate. This will result in the flash steam in the high-pressure flash tank carrying a lot of ash and liquid, affecting the normal operation of subsequent systems.

[0004] Therefore, this utility model provides a high-pressure flash tank for coal gasification. Utility Model Content

[0005] The purpose of this invention is to propose a high-pressure flash tank for coal gasification, which solves the problems of easy scaling inside the S-shaped baffle and easy damage to the guide plate in the flash process of existing high-pressure flash tanks, resulting in serious ash and liquid carryover in the flash steam. The invention achieves that the baffle is less prone to clogging during flash steaming and reduces the phenomenon of ash and liquid carryover in the flash steam, thus greatly improving the efficiency of flash steaming.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a high-pressure flash tank for coal gasification, comprising:

[0007] A tank body for flash evaporation of high-temperature and high-pressure liquids, the tank body being provided with a first water inlet, a second water inlet, a liquid outlet, and a steam outlet;

[0008] A flushing pipe, one end of which is inserted into the inside of the tank;

[0009] Also includes:

[0010] Multiple tongue-shaped trays are spaced apart inside the tank. One end of each tongue-shaped tray is located on the first side of the inner wall of the tank, and the other end is close to the second side of the inner wall of the tank, with a gap between them.

[0011] Multiple sieve trays are spaced apart inside the tank. One end of each sieve tray is located on the second side of the inner wall of the tank, and the other end is close to the first side of the inner wall of the tank, leaving a gap between the two sides. The sieve trays and tongue-shaped trays are arranged alternately and at intervals. The tongue-shaped trays and sieve trays are used to reduce the flow velocity of flash vapor and increase the contact area with the liquid during the upward flow of flash vapor.

[0012] Multiple connecting plates are respectively disposed between the sieve plate type tower plate and the first side of the inner wall of the tank, and between the tongue-shaped tower plate and the second side of the inner wall of the tank;

[0013] The swirl vanes are rotatably mounted inside the tank via an annular plate and located above the flushing pipe. The swirl vanes rotate under the drive of flash vapor and cause the liquid to flow in all directions through centrifugal force, thereby ensuring uniform contact between vapor and liquid.

[0014] Multiple downcomers, one of which is vertically mounted on the annular plate, and the remaining downcomers are respectively vertically mounted on the connecting plate;

[0015] A baffle plate is disposed inside the tank and located above the swirl blades.

[0016] Preferably, the tongue-shaped tray has multiple tongue holes.

[0017] Preferably, the sieve plate tower plate has multiple sieve holes.

[0018] Preferably, the baffle plate has a C-shaped structure.

[0019] Preferably, a first baffle is provided on one side of the top of the baffle plate, and the first baffle plate is connected to the inner wall of the tank. A second baffle is provided on the other side of the bottom of the baffle plate, and the second baffle plate is connected to the inner wall of the tank.

[0020] Preferably, the flushing pipe is equipped with a flushing valve.

[0021] Preferably, the first water inlet is the black water inlet of the gasifier, and the second water inlet is the black water inlet of the carbon washing tower.

[0022] The beneficial effects of this utility model are:

[0023] 1. This utility model reduces the flash steam velocity by arranging tongue-shaped trays and sieve trays in the tank body with the two types of trays spaced apart. During the flash evaporation process, it also reduces the phenomenon of flash steam carrying ash and liquid, thereby greatly improving the efficiency of flash evaporation. In addition, tongue-shaped trays and sieve trays are simple to manufacture, have no moving parts, and are not easy to clog.

[0024] 2. This utility model has a swirl vane installed in the tank, and the swirl vane is rotated by the flow of flash steam. The centrifugal effect makes the liquid layer very thin and the steam-liquid contact uniform, thereby greatly improving the efficiency of flash evaporation.

[0025] 3. By changing the S-type baffle to a C-type baffle, the C-type baffle is less prone to clogging, easier to clean, and more convenient to disassemble and assemble, thus reducing the labor intensity of maintenance personnel. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the entire utility model.

[0027] Figure 2 This is a schematic diagram of the sieve-type tower plate of this utility model.

[0028] Figure 3 This is a schematic diagram of the tongue-shaped tray of this utility model.

[0029] Figure 4 This is a cross-sectional view of the tongue hole of this utility model.

[0030] Figure 5 This is a schematic diagram of the baffle plate of this utility model.

[0031] In the diagram: 1. Tank body; 11. First inlet; 12. Second inlet; 13. Flushing pipe; 14. Drain outlet; 15. Steam outlet; 16. Flushing valve; 2. Tongue-shaped tray; 21. Tongue hole; 3. Sieve tray; 31. Sieve hole; 4. Connecting plate; 5. Swirl vane; 6. Annular plate; 7. Downcomer; 8. Baffle plate; 81. First baffle; 82. Second baffle. Detailed Implementation

[0032] The method of using this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0033] like Figures 1 to 5 As shown, a high-pressure flash tank for coal gasification includes:

[0034] Tank 1 is used for flash evaporation of high temperature and high pressure liquids. The tank 1 is provided with a first water inlet 11, a second water inlet 12, a liquid outlet 14 and a steam outlet 15.

[0035] The flushing pipe 13 has one end inserted into the inside of the tank 1;

[0036] Also includes:

[0037] Multiple tongue-shaped trays 2 are spaced apart inside the tank body 1. One end of each tongue-shaped tray 2 is located on the first side of the inner wall of the tank body 1, and the other end is close to the second side of the inner wall of the tank body 1, with a gap between them.

[0038] Multiple sieve trays 3 are spaced apart inside the tank 1. One end of each sieve tray 3 is located on the second side of the inner wall of the tank 1, and the other end is close to the first side of the inner wall of the tank 1 with a gap between it and the first side. The sieve trays 3 and the tongue-shaped trays 2 are arranged alternately and at intervals. The tongue-shaped trays 2 and the sieve trays 3 are used to reduce the flow velocity of the flash vapor and increase the contact area with the liquid during the upward flow of the flash vapor.

[0039] Multiple connecting plates 4 are respectively disposed between the sieve plate type tower plate 3 and the first side of the inner wall of the tank 1, and between the tongue-shaped tower plate 2 and the second side of the inner wall of the tank 1;

[0040] The swirl vane 5 is rotatably mounted inside the tank 1 via the annular plate 6 and is located above the flushing pipe 13. The swirl vane 5 rotates under the drive of flash steam and causes the liquid to flow in all directions through centrifugal force, thereby ensuring uniform contact between vapor and liquid. The center of the swirl vane 5 is a swirl plate with a diameter of 1600mm. The swirl vane 5 has the characteristics of large processing capacity, high load, low pressure drop, wide elasticity, and is not easy to clog.

[0041] When the airflow passes through the rotating blades, it generates a certain centrifugal force. When the liquid passes through the rotating blades, it is affected by the airflow. The centrifugal force makes the liquid layer very thin and the gas-liquid contact uniform. The sprayed droplets will hit the tower wall and flow to the lower tower plate through the downcomer 7.

[0042] Multiple downcomer pipes 7 are provided, one of which is vertically mounted on the annular plate 6, and the remaining downcomer pipes 7 are vertically mounted on the connecting plate 4. The diameter of each downcomer pipe 7 is 150 mm, and the downcomer pipe 7 is used to guide the liquid from the upper layer to the lower layer.

[0043] Four layers of washing trays are installed inside the high-pressure flash tank, with the bottom tray being 800mm higher than the high-pressure, high-temperature liquid inlet.

[0044] In addition, a tray washing system is added to reduce flash vapor velocity and reduce the phenomenon of flash vapor carrying ash and liquid.

[0045] The baffle plate 8 is disposed inside the tank body 1 and located above the swirl blade 5.

[0046] The tongue-shaped tray 2 has multiple tongue holes 21. The tongue holes 21 of the tongue-shaped tray 2 are directly punched on the tray. The tongue is 50mm long, 20° angled, and 25mm wide. They are evenly distributed on the tray, and the orifices are aligned with the liquid flow direction.

[0047] The sieve tray 3 has multiple sieve holes 31. The sieve tray 3 has sieve holes 31 with a diameter of 80 mm. The top of the tray is provided with flushing water to flush the tray and remove flash steam.

[0048] Tongue-shaped tray 2 and sieve tray 3 are simple to manufacture, have no moving parts, and are not prone to clogging.

[0049] The baffle plate 8 has a C-shaped structure. The C-shaped baffle plate 8 is easy to clean, easy to disassemble and assemble, and reduces the labor intensity of maintenance personnel.

[0050] The baffle plate 8 has a first baffle plate 81 on one side of its top, and the first baffle plate 81 is connected to the inner wall of the tank body 1. The baffle plate 8 has a second baffle plate 82 on the other side of its bottom, and the second baffle plate 82 is connected to the inner wall of the tank body 1.

[0051] The flushing pipe 13 is equipped with a flushing valve 16. The flushing valve 16 controls the flow of flushing water and performs flushing.

[0052] The first water inlet 11 is the black water inlet of the gasifier, and the second water inlet 12 is the black water inlet of the carbon washing tower.

[0053] Working process: Black water from the gasifier at 270℃ and 6.1 MPa and wastewater from the carbon washing tower at 260℃ and 6.0 MPa enter the high-pressure flash tank (operating pressure 1.0 MPa, 190℃) through the first inlet 11 and the second inlet 12 respectively; the high-pressure and high-temperature liquids undergo flash evaporation after entering the high-pressure flash tank.

[0054] The flash vapor first passes through the tongue hole 21 on the bottom tongue-shaped tray 2, entering between the tongue-shaped tray 2 and the sieve tray 3. Then it passes through the sieve hole 31 on the sieve tray 3 and enters the sieve tray 3 and the tongue-shaped tray 2 in sequence, passing through two layers of tongue-shaped tray 2 and sieve tray 3. The flow rate of the flash vapor is reduced by the tongue-shaped tray 2 and the sieve tray 3. When the flash vapor flows into the swirl vane 5, it will drive the swirl vane 5 to rotate. When the airflow passes through the rotating vane, it will generate a certain centrifugal force. When the liquid passes through the rotating vane, it will be affected by the airflow. The centrifugal effect makes the liquid layer very thin and the vapor-liquid contact uniform. The sprayed droplets will hit the inner wall of the tank 1 and then flow downward through the downcomer 7 on the annular plate 6 and enter the lower tray.

[0055] The flash vapor passing through the swirl vane 5 will flow laterally below the C-shaped baffle 8 and the first baffle 81, pass through the C-shaped baffle 8 and enter above the second baffle 82, and finally flow out from the exhaust port 15. The remaining liquid after flash evaporation will be discharged from the liquid outlet 14.

[0056] During the flash evaporation process, the flushing valve 16 on the outside of the tank 1 will open, allowing flushing water to flow from the flushing pipe 13 into the tank 1 and flow downward from above the top sieve plate 3, making full contact with the flash vapor, and flowing to each layer of tongue-shaped plate 2 and sieve plate 3. It then flows downward from the downcomer 7 on the connecting plate 4 and finally flows into the bottom of the tank 1, where it is discharged from the drain port 14.

[0057] Finally, it should be noted that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. However, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A high-pressure flash tank for coal gasification, comprising: Tank (1) is used for flash evaporation of high temperature and high pressure liquid. The tank (1) is provided with a first water inlet (11), a second water inlet (12), a liquid outlet (14) and a steam outlet (15). A flushing pipe (13) is inserted into the tank (1) at one end; Its characteristic is that it further includes: Multiple tongue-shaped trays (2) are spaced apart inside the tank (1). One end of each tongue-shaped tray (2) is located on the first side of the inner wall of the tank (1), and the other end is close to the second side of the inner wall of the tank (1), with a gap between them. Multiple sieve trays (3) are spaced apart inside the tank (1). One end of each sieve tray (3) is located on the second side of the inner wall of the tank (1), and the other end is close to the first side of the inner wall of the tank (1) with a gap between it and the first side. The sieve trays (3) and the tongue-shaped trays (2) are spaced apart and alternately arranged. The tongue-shaped trays (2) and the sieve trays (3) are used to reduce the flow velocity of the flash vapor and increase the contact area with the liquid during the upward flow of the flash vapor. Multiple connecting plates (4) are respectively disposed between the sieve plate tower (3) and the first side of the inner wall of the tank (1), and between the tongue-shaped tower plate (2) and the second side of the inner wall of the tank (1); The swirl vane (5) is rotatably disposed inside the tank (1) via the annular plate (6) and located above the flushing pipe (13). The swirl vane (5) rotates by the push of the flash vapor and causes the liquid to flow to all sides by centrifugal force, thereby making the vapor and liquid contact evenly. Multiple downcomers (7), one of which is vertically mounted on the annular plate (6), and the remaining downcomers (7) are vertically mounted on the connecting plate (4); The baffle plate (8) is located inside the tank body (1) and above the swirl vane (5).

2. The high-pressure flash tank for coal gasification according to claim 1, characterized in that: The tongue-shaped tray (2) has multiple tongue holes (21).

3. The high-pressure flash tank for coal gasification according to claim 1, characterized in that: The sieve plate tower (3) has multiple sieve holes (31).

4. The high-pressure flash tank for coal gasification according to claim 1, characterized in that: The baffle (8) has a C-shaped structure.

5. A high-pressure flash evaporator for coal gasification according to claim 1, characterized in that: The baffle plate (8) has a first baffle (81) on one side of its top, and the first baffle (81) is connected to the inner wall of the tank (1). The baffle plate (8) has a second baffle (82) on the other side of its bottom, and the second baffle (82) is connected to the inner wall of the tank (1).

6. A high-pressure flash evaporator for coal gasification according to claim 1, characterized in that: The flushing pipe (13) is equipped with a flushing valve (16).

7. A high-pressure flash evaporator for coal gasification according to claim 1, characterized in that: The first water inlet (11) is the black water inlet of the gasifier, and the second water inlet (12) is the black water inlet of the carbon washing tower.

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