A high flash tower and method for coal gasification black water treatment

Abstract

The present application relates to the technical field of high flash tower optimization, and discloses a high flash tower and method for treating coal gasification black water, which comprises a high flash tower body provided with a separation cylinder, a partition plate and a plurality of trays, wherein the partition plate separates the high flash tower body into an upper high flash tower and a lower high flash tower; the separation cylinder is provided with a flash steam rising cylinder, a liquid descending cylinder and a flash steam output port; the flash steam rising cylinder is provided with a contraction section on the cylinder body, and a spraying device is arranged in the contraction section; the spraying device is arranged in the contraction section, so that the liquid sprayed by the spraying device forms a spray and fully contacts with the flash steam; the spraying port of the spraying device faces the input port of the flash steam rising cylinder, which can effectively wash the flash steam entering the flash steam rising cylinder, fully washes away the dust mixed in the flash steam, avoids causing the tray to be blocked, reduces the speed of the flash steam entering the separation cylinder, thereby realizing the gas-liquid separation of the flash steam in the separation cylinder, removing the solid impurities in the flash steam and reducing the risk of system pipeline wear.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high flash tower optimization, in particular to a high flash tower and method for coal gasification black water treatment. BACKGROUND

[0002] The current black water treatment system is configured in one-to-one with the gasification furnace. The black water from the gasification furnace, scrubbing tower and cyclone separator is subjected to pressure reduction and then sent to the high flash system of the first part of the black water treatment system through an angle valve. According to the prior art, the pressure-reduced black water is subjected to gas-liquid separation in the high flash tower. After the acid gas in the water vapor and water is flashed out, the water vapor and water are subjected to direct contact with the deoxygenated water in the upper part of the high flash tower through the riser cover. The flashed gas is condensed, and the heated deoxygenated water flows to the high-temperature hot water tank and then to the gasification system for use. Due to the ash-carrying characteristics of the black water system before flashing, the tower tray is often blocked during flashing in the high flash tower, and the high flash tower liquid overflow phenomenon occurs. The acid gas is not completely resolved, and the pipeline is severely corroded. Figure 1 The prior art high flash tower is internally provided with a riser cover and a fixed tower tray. This kind of high flash tower has three main problems:

[0003] (1) When the flashed gas carries ash, the tower tray is easily blocked, the temperature of the high flash tower rises, the system overpressure occurs, the safety valve is triggered, the water system fluctuates, and the gasification system is shut down.

[0004] (2) The flashed gas is not sufficiently washed, the solid content in the water increases, and when the black water flows to the high-temperature hot water tank, the pump inlet filter is blocked and the pipeline is scaled.

[0005] (3) The flashed gas is not sufficiently washed, the ammonia in the water crystallizes, and the system pipeline is abraded and corroded.

[0006] SUMMARY In order to overcome the defects of the prior art, the purpose of the present application is to provide a high flash tower and method for coal gasification black water treatment, so as to solve the technical problems that dust is easily blocked in the tower tray and the liquid in the flashed gas is easily abraded and scaled in the system pipeline when the pressure-reduced black water is subjected to gas-liquid separation in the high flash tower, and the acid gas in the water vapor and water is flashed out.

[0007] The present application is achieved by the following technical solutions:

[0008] In a first aspect, the present application provides a high flash tower for coal gasification black water treatment, comprising a high flash tower body.

[0009] A separation cylinder, a partition plate and a plurality of tower trays are arranged in the high flash tower body, and the partition plate divides the high flash tower body into a high flash upper tower and a high flash lower tower.

[0010] The separation cylinder is arranged in the high flash upper tower and the high flash lower tower, and the separation cylinder is provided with a plurality of separation holes.

[0011] The separation cylinder is provided with a flash vapor rising cylinder, a liquid descending cylinder and a flash vapor output port, the output end of the flash vapor rising cylinder is arranged at the top of the side end of the separation cylinder, and the input end of the flash vapor rising cylinder extends into the high flash lower tower through a partition plate, wherein the inner diameter of the flash vapor rising cylinder is smaller than the inner diameter of the separation cylinder; the liquid descending cylinder is arranged at the bottom end of the separation cylinder and located in the high flash lower tower; and the flash vapor output port is arranged at the top of the separation cylinder and located in the high flash upper tower.

[0012] A plurality of trays are arranged in the high flash upper tower in sequence and located above the flash vapor output port.

[0013] The flash vapor rising cylinder is provided with a contraction section on the cylinder body, and a spraying device is arranged in the contraction section, and the spraying port of the spraying device is arranged towards the input port of the flash vapor rising cylinder.

[0014] Preferably, the flash vapor rising cylinder comprises a first cylinder body and a second cylinder body, the first cylinder body is connected to the top of the side end of the separation cylinder and is arranged on the side wall of the separation cylinder in the same horizontal plane and inclined, one end of the second cylinder body is in vertical communication with the first cylinder body, and the other end extends into the high flash lower tower through the partition plate in a vertical manner, the contraction section is arranged on the second cylinder body and located close to the first cylinder body, and the inner diameter of the contraction section is smaller than the inner diameters of the first cylinder body and the second cylinder body.

[0015] Further, the spraying device comprises two groups of nozzles, the two groups of nozzles are arranged on the side wall of the contraction section respectively, the input ends of the two groups of nozzles are connected to the spraying water output device through the contraction section and the high flash upper tower, and the spraying ports of the two groups of nozzles are arranged towards the input port of the second cylinder body.

[0016] Preferably, the lower part of the separation cylinder is in the shape of a conical body, the bottom of the conical body is in communication with the liquid descending cylinder or is in communication with the liquid descending cylinder through a partition plate.

[0017] Further, the partition plate is provided with a first through hole and a second through hole, the flash vapor rising cylinder extends into the high flash lower tower through the first through hole, wherein the hole diameter of the first through hole corresponds to the cylinder diameter of the flash vapor rising cylinder, and the contact part of the flash vapor rising cylinder and the first through hole is arranged in a sealing manner, and the lower part of the separation cylinder or the liquid descending cylinder extends into the high flash lower tower through the second through hole, wherein the hole diameter of the second through hole corresponds to the outer diameter of the lower part of the separation cylinder or the liquid descending cylinder, and the contact part of the lower part of the separation cylinder or the liquid descending cylinder and the second through hole is arranged in a sealing manner.

[0018] Preferably, the top of the high flash upper tower is provided with a flash vapor discharge port, and the plurality of trays are located below the flash vapor discharge port.

[0019] Further, the side wall of the high-flash upper tower is further provided with an oxygen-removing nozzle, which is located between the flash steam outlet and the several trays, and the nozzle is arranged to face the several trays, and the input end of the oxygen-removing nozzle is connected to the oxygen-removing water output device through the high-flash upper tower.

[0020] Further, the high-flash upper tower is further provided with a demister, which is located between the flash steam outlet and the oxygen-removing nozzle.

[0021] Preferably, the high-flash lower tower is provided with a black water input port, which is arranged close to the flash steam rising cylinder, and the black water input port is connected to the black water discharge device, the bottom of the high-flash lower tower is in a conical structure for containing liquid, the pipe opening of the liquid descending cylinder extends into the liquid surface, and the bottom of the high-flash lower tower is provided with a liquid output pipe at the port of the conical structure for discharging liquid.

[0022] In the second aspect, the application further provides a method for treating coal gasification black water, which is based on the high-flash tower and comprises the following processes:

[0023] The black water entering the high-flash lower tower is subjected to flash evaporation to form flash steam, the flash steam enters the flash steam rising cylinder in the high-flash lower tower and rises, when the flash steam in the flash steam rising cylinder passes through the contraction section, the inner diameter of the contraction section is smaller than that of the flash steam rising cylinder, so that the rising speed of the flash steam is increased and the fluid pressure is reduced, the liquid sprayed by the spraying device forms a spray to fully contact the flash steam, the dust mixed in the flash steam is fully washed, and the washed flash steam enters the separation cylinder after passing through the contraction section;

[0024] The speed of the flash steam entering the separation cylinder is reduced, the liquid in the flash steam descends along the side wall of the separation cylinder under the action of centrifugal force and gravity, and returns to the high-flash lower tower through the liquid descending cylinder, while the flash steam descends with the liquid, and rises from the center of the bottom of the separation cylinder to the high-flash upper tower through the flash steam output port, and then rises to the several trays to complete the treatment of the coal gasification black water.

[0025] Compared with the prior art, the application has the following beneficial technical effects:

[0026] The application provides a high flash tower for treating coal gasification black water, which comprises a high flash tower body, a separation cylinder and a partition plate arranged in the high flash tower body; the partition plate divides the high flash tower body into a high flash upper tower and a high flash lower tower; the separation cylinder is provided with a flash steam rising cylinder, a liquid descending cylinder and a flash steam output port; the input end of the flash steam rising cylinder extends into the high flash lower tower through the partition plate, and can effectively input the flash steam in the high flash lower tower into the separation cylinder; the flash steam rising cylinder is provided with a contraction section on the cylinder body, which can effectively increase the rising speed of the flash steam and reduce the fluid pressure; the contraction section is provided with a spraying device, so that the liquid sprayed by the spraying device forms a spray and fully contacts with the flash steam; the spraying port of the spraying device faces the input port of the flash steam rising cylinder, which can effectively wash the flash steam entering the flash steam rising cylinder and fully wash away the dust mixed in the flash steam, thereby avoiding a series of problems such as tower tray blockage and temperature rise of the high flash tower; the contraction section on the flash steam rising cylinder can increase the rising speed of the flash steam; the liquid in the flash steam is thrown to the inner wall of the separation cylinder under the action of centrifugal force and gravity, reaches the high flash lower tower through the liquid descending cylinder, and the flash steam descends with the liquid and rises from the bottom center of the separation cylinder to the high flash upper tower through the flash steam output port, so that the gas-liquid separation of the flash steam in the separation cylinder is realized; the flash steam entering the high flash upper tower is free of solid impurities, so that pipeline fouling cannot be formed and the risk of system pipeline wear is reduced.

[0027] Further, the flash steam rising cylinder comprises a first cylinder body and a second cylinder body; the first cylinder body is connected to the top of the side end of the separation cylinder and is arranged on the side wall of the separation cylinder in the same horizontal plane, so that the liquid in the flash steam can descend along the side wall of the separation cylinder and guide the liquid descending; one end of the second cylinder body is in vertical communication with the first cylinder body, and the other end extends into the high flash lower tower through the partition plate; the contraction section is arranged on the second cylinder body and located close to the first cylinder body; the inner diameter of the contraction section is smaller than that of the first cylinder body and the second cylinder body, so that the flash steam entering the second cylinder body can increase the rising speed and reduce the fluid pressure in a small space, and the liquid sprayed by the spraying device forms a spray and fully contacts with the flash steam to fully wash the dust mixed in the flash steam.

[0028] Further, the spraying device comprises two groups of nozzles arranged on the side wall of the contraction section; the input ends of the two groups of nozzles are connected to a spraying water output device through the contraction section and the high flash upper tower; the spraying ports of the two groups of nozzles face the input port of the second cylinder body; the spraying water output device ensures the supply of spraying water; the two groups of nozzles on the side wall of the second cylinder body can effectively fully wash the flash steam entering the second cylinder body, effectively remove the dust in the flash steam, avoid tower tray blockage in subsequent work, and thus affect the overall temperature of the high flash tower body.

[0029] Further, the lower part of the separation cylinder is a conical body, the bottom of the conical body is communicated with the liquid descending cylinder or communicated with the liquid descending cylinder through the partition plate, the conical body guides the liquid thrown to the side wall of the separation cylinder, so that the liquid can quickly return to the bottom of the flash evaporation lower tower along the liquid descending pipe, and the accumulation of the liquid in the separation cylinder is avoided, and the optimization of the flash evaporation steam is affected.

[0030] Further, the partition plate is provided with a first through hole and a second through hole, the flash evaporation rising cylinder extends into the high flash lower tower through the first through hole, wherein the hole diameter of the first through hole corresponds to the cylinder diameter of the flash evaporation rising cylinder, and the contact part of the flash evaporation rising cylinder and the first through hole is sealed, the lower part of the separation cylinder or the liquid descending cylinder extends into the high flash lower tower through the second through hole, wherein the hole diameter of the second through hole corresponds to the outer diameter of the lower part of the separation cylinder or the liquid descending cylinder, and the contact part of the lower part of the separation cylinder or the liquid descending cylinder and the second through hole is sealed, so that the flash evaporation steam in the high flash lower tower can only enter the high flash upper tower through the separation cylinder, and direct passing is avoided, thereby the separation cylinder plays an optimization role on the flash evaporation steam.

[0031] Further, the side wall of the high flash upper tower is further provided with a deoxygenation nozzle, the deoxygenation nozzle is located between the flash evaporation steam discharge port and the plurality of tower trays, and the nozzle is arranged to be aligned with the plurality of tower trays, the input end of the deoxygenation nozzle is connected to a deoxygenation water output device through the high flash upper tower, the deoxygenation nozzle can optimize the flash evaporation steam from the separation cylinder again, and the tower trays in the high flash tower body are cleaned, so that the tower trays are prevented from being blocked.

[0032] Further, the high flash upper tower is further provided with a demister, the demister is located between the flash evaporation steam discharge port and the deoxygenation nozzle, and can perform demisting work on the flash evaporation steam.

[0033] Further, the bottom of the high flash lower tower is a conical structure for containing liquid, the pipe opening of the liquid descending cylinder extends into the liquid surface of the liquid, and plays a water sealing role to prevent the flash evaporation steam from entering the separation cylinder from the liquid descending cylinder.

[0034] The application also provides a method for treating coal gasification black water, which adds a separation cylinder in a high flash tower under the action of a high flash tower optimization device; when the black water reaches the high flash tower for flash evaporation through an angle valve, flash steam rises to the inside of the separation cylinder through a flash steam rising cylinder of the separation cylinder; a contraction section is arranged in the flash steam rising cylinder; the flash steam passes through the contraction section to increase the rising speed and reduce the fluid pressure, so that the liquid sprayed by a spraying device forms a spray to fully contact the flash steam, and dust mixed in the flash steam is fully washed; the liquid in the flash steam is thrown to the inner wall of the separation cylinder under the action of centrifugal force and gravity, reaches the high flash lower tower through a liquid descending cylinder, and the flash steam descends with the liquid and rises to the high flash upper tower through a flash steam output port at the bottom of the separation cylinder, so that gas-liquid separation of the flash steam in the separation cylinder is realized, and the separation cylinder is facilitated to accelerate gas-liquid separation. The spraying device is arranged on the contraction section, so that the liquid sprayed by the spraying device forms a spray to fully contact the flash steam, the flash steam in the flash steam rising cylinder is washed, dust mixed in the flash steam is washed away, and a series of problems such as tower tray blockage and temperature rise of the high flash tower are avoided. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 It is a high flash tower structure schematic diagram in the prior art;

[0036] Figure 2 It is a high flash tower structure schematic diagram in the application;

[0037] Figure 3 It is a high flash tower structure schematic diagram in the embodiment of the application;

[0038] Figure 4 It is a separation cylinder structure schematic diagram in the embodiment of the application;

[0039] Figure 5 It is Figure 4 A part cross-sectional schematic diagram in the application;

[0040] Figure 6 It is Figure 4 B part enlarged schematic diagram in the application;

[0041] In the figure: 1-high flash tower body; 2-high flash upper tower; 3-high flash lower tower; 4-separation cylinder; 5-spraying water output device; 6-flash steam rising cylinder; 7-liquid descending cylinder; 8-flash steam output port; 9-tray; 10-oxygen removal water output device; 11-foam remover; 12-flash steam discharge port; 13-flash steam collection device; 14-baffle; 15-black water discharge device; 16-liquid output pipe; 17-liquid collection pool; 18-sprayer; 19-contraction section; 20-first cylinder body; 21-second cylinder body; 22-oxygen removal sprayer; 23-black water input port. DETAILED DESCRIPTION

[0042] In order to make the person skilled in the art better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the scope of protection of the present application.

[0043] The present application will be described in further detail below in conjunction with the drawings:

[0044] The present application aims to provide a high-flash tower and method for coal gasification black water treatment, to solve the technical problem that the dust is easily trapped in the flash steam obtained after the steam and acidic gas in the water are flashed out when the black water after pressure reduction is subjected to gas-liquid separation in the high-flash tower, the dust is easy to block the tray, and the liquid in the flash steam has a large solid content, which is easy to cause system pipeline wear and pipeline fouling.

[0045] Embodiment 1

[0046] Referring to Figure 2 , in an embodiment of the present application, a high-flash tower for coal gasification black water treatment is provided, comprising a high-flash tower body 1;

[0047] The high-flash tower body 1 is provided with a separation cylinder 4, a partition plate 14 and a plurality of trays 9, and the partition plate 14 separates the high-flash tower body 1 into a high-flash upper tower 2 and a high-flash lower tower 3;

[0048] The separation cylinder 4 is provided with a flash steam rising cylinder 6, a liquid descending cylinder 7 and a flash steam output port 8, as shown in Figure 4 , the output end of the flash steam rising cylinder 6 is arranged at the top of the side end of the separation cylinder 4, and the input end of the flash steam rising cylinder 6 extends into the high-flash lower tower 3 through the partition plate 14, wherein the inner diameter of the flash steam rising cylinder 6 is smaller than the inner diameter of the separation cylinder 4; the liquid descending cylinder 7 is arranged at the bottom end of the separation cylinder 4 and located in the high-flash lower tower 3; the flash steam output port 8 is arranged at the top of the separation cylinder 4 and located in the high-flash upper tower 2;

[0049] The plurality of trays 9 are arranged in the high-flash upper tower 2 in sequence and are located above the flash steam output port 8;

[0050] The flash steam rising cylinder 6 is provided with a contraction section 19 on the cylinder body, the contraction section 19 is provided with a spraying device, and the spraying port of the spraying device is arranged towards the input port of the flash steam rising cylinder 6.

[0051] The separation cylinder 4 in the embodiment can pass through the partition plate 14 along the inner wall of the high-flash tower body 1, and the upper part of the separation cylinder 4 is located in the high-flash upper tower 2, and the lower part of the separation cylinder 4 is located in the high-flash lower tower 3, as shown in Figure 2 The separation cylinder 4 can also be arranged in the high-flash upper tower 2, wherein the input end of the flash steam rising cylinder 6 of the separation cylinder 4 extends into the high-flash lower tower 3 through the partition plate 14, and the liquid falling cylinder 7 is located in the high-flash lower tower 3; the flash steam output port 8 is located in the high-flash upper tower 2, as shown in Figure 3 .

[0052] In the embodiment, the partition plate 14 is arranged between the high-flash upper tower 2 and the high-flash lower tower 3, so that the flash steam of the high-flash lower tower directly enters the high-flash upper tower, and the flash steam can only enter the high-flash upper tower 2 from the high-flash lower tower 3 through the flash steam rising cylinder 6 of the separation cylinder. When the flash steam enters the flash steam rising cylinder 6, the contraction section 19 accelerates the upward movement of the flash steam, and the spraying device can effectively wash the flash steam entering the flash steam rising cylinder, so that the dust mixed in the flash steam is fully washed away, thereby avoiding the tower tray from being blocked, and the controllability of the temperature in the high-flash tower body 1 is ensured.

[0053] Specifically, the flash steam rising cylinder 6 includes a first cylinder body 20 and a second cylinder body 21. The first cylinder body 20 is connected to the side end top of the separation cylinder 4 and is arranged on the side wall of the separation cylinder 4 in the same horizontal plane and inclined, as shown in Figure 5 The other end of the second cylinder body 21 extends into the high-flash lower tower 3 vertically through the partition plate 14. The contraction section 19 is arranged on the second cylinder body 21 and located close to the first cylinder body 20. The inner diameter of the contraction section 19 is smaller than the inner diameters of the first cylinder body 20 and the second cylinder body 21, as shown in Figure 6 .

[0054] In the embodiment, the flash steam rising cylinder 6 is divided into the first cylinder body 20 and the second cylinder body 21. The second cylinder body 21 extends into the high-flash lower tower 3 through the partition plate 14, so that the flash steam in the high-flash lower tower 3 enters and rises from the second cylinder body 21. The contraction section 19 arranged on the second cylinder body 21 can increase the rising speed of the flash steam in the second cylinder body 21 and reduce the fluid pressure, so that the liquid sprayed by the spraying device fully contacts the flash steam in the form of spray, and the dust mixed in the flash steam is fully washed. The spraying device is arranged on the contraction section 19, and the spraying device washes the flash steam entering the second cylinder body 21, removes the dust mixed in the flash steam, and makes the dust fall to the bottom of the high-flash lower tower 3 through the liquid. The washed flash steam enters the separation cylinder through the first cylinder body 20.

[0055] Specifically, the spraying device is two groups of spray heads 18, which are respectively arranged on the side walls of the contraction section 19. The input ends of the two groups of spray heads 18 are connected to the spraying water output device 5 through the contraction section 19 and the high-flash upper tower 2. The spraying openings of the two groups of spray heads 18 are arranged towards the input port of the second cylinder 21.

[0056] In the embodiment, the spraying device is two groups of spray heads 18, which are respectively arranged on the side walls of the second cylinder 21 and are close to the first cylinder 20. The spraying openings of the spray heads 18 are arranged towards the input port of the second cylinder 21. The spraying water output device 5 ensures the supply of spraying water. The two groups of spray heads 18 on the side walls of the second cylinder 21 can effectively fully wash the flash vapor entering the second cylinder 21, effectively remove the dust in the flash vapor, and avoid blocking the tray in the subsequent work, thereby affecting the overall temperature of the flash tower body.

[0057] Specifically, the lower part of the separation cylinder 4 is a conical body, the bottom of the conical body is in communication with the liquid descending cylinder 7 or is in communication with the liquid descending cylinder 7 through the partition plate 14.

[0058] In the embodiment, the conical body guides the liquid splashed to the side wall of the separation cylinder 4, so that the liquid can quickly return to the bottom of the flash lower tower 3 along the liquid descending cylinder 7, and the accumulation of the liquid in the separation cylinder 4 is avoided, and the optimization work on the flash vapor is affected.

[0059] Specifically, the partition plate 14 is provided with a first through hole and a second through hole. The flash vapor ascending cylinder 6 extends into the high-flash lower tower 3 through the first through hole. The diameter of the first through hole corresponds to the cylinder diameter of the flash vapor ascending cylinder 6, and the contact position of the flash vapor ascending cylinder 6 and the first through hole is sealed. The lower part of the separation cylinder 4 or the liquid descending cylinder 7 extends into the high-flash lower tower 3 through the second through hole. The diameter of the second through hole corresponds to the outer diameter of the lower part of the separation cylinder 4 or the liquid descending cylinder 7, and the contact position of the lower part of the separation cylinder 4 or the liquid descending cylinder 7 and the second through hole is sealed.

[0060] In the embodiment, the partition plate 14 can be an inclined plate. The high-temperature liquid separated from the tray can flow to the partition plate 14 and further circulate to the gasification system along the inclined direction for use. The contact position of the flash vapor ascending cylinder 6 and the first through hole is sealed, and the contact position of the second through hole of the partition plate 14 and the lower part of the separation cylinder 4 or the liquid descending cylinder 7 is sealed. In this way, the flash vapor in the high-flash lower tower 3 can only enter the high-flash upper tower 2 through the separation cylinder 4, and direct passage is avoided. Therefore, the separation cylinder 4 plays an optimization role on the flash vapor.

[0061] Embodiment 2

[0062] According to Figure 2As shown, the embodiment provides a high flash tower for treating coal gasification black water, which comprises a high flash tower body 1, a separation cylinder 4, a partition plate 14 and a plurality of tower trays 9 arranged in the high flash tower body 1, and the partition plate 14 separates the high flash tower body 1 into a high flash upper tower 2 and a high flash lower tower 3.

[0063] The separation cylinder 4 is provided with a flash steam rising cylinder 6, a liquid descending cylinder 7 and a flash steam output port 8, as shown in the figure. Figure 3 As shown, the output end of the flash steam rising cylinder 6 is arranged at the top of the side end of the separation cylinder 4, and the input end of the flash steam rising cylinder 6 extends into the high flash lower tower 3 through the partition plate 14, wherein the inner diameter of the flash steam rising cylinder 6 is smaller than the inner diameter of the separation cylinder 4; the liquid descending cylinder 7 is arranged at the bottom end of the separation cylinder 4 and located in the high flash lower tower 3; and the flash steam output port 8 is arranged at the top of the separation cylinder 4 and located in the high flash upper tower 2.

[0064] The plurality of tower trays 9 are arranged in the high flash upper tower 2 in sequence and above the flash steam output port 8.

[0065] The flash steam rising cylinder 6 is provided with a contraction section 19 on the cylinder body, the contraction section 19 is provided with a spraying device, and the spraying port of the spraying device is arranged towards the input port of the flash steam rising cylinder 6.

[0066] Specifically, the top of the high flash upper tower 2 is provided with a flash steam discharge port 12, and the plurality of tower trays 9 are located below the flash steam discharge port 12.

[0067] Specifically, the sidewall of the high flash upper tower 2 is further provided with a deoxygenation nozzle 22, the deoxygenation nozzle 22 is located between the flash steam discharge port 12 and the plurality of tower trays 9, the nozzle is arranged towards the plurality of tower trays 9, and the input end of the deoxygenation nozzle 22 is connected to a deoxygenation water output device 10 through the high flash upper tower 2.

[0068] In the embodiment, the deoxygenation nozzle 22 can optimize the flash steam from the separation cylinder again, clean the tower trays in the high flash tower body, and avoid tower tray blockage.

[0069] Specifically, the high flash upper tower 2 is further provided with a demister 11, and the demister 11 is located between the flash steam discharge port 12 and the deoxygenation nozzle 22.

[0070] Specifically, the high flash lower tower 3 is provided with a black water input port 23, the black water input port 23 is arranged close to the flash steam rising cylinder 6, the black water input port 23 is connected to a black water discharge device 15, the bottom of the high flash lower tower 3 is in a conical structure for containing liquid, the pipe opening of the liquid descending cylinder 7 extends into the liquid surface, the bottom of the high flash lower tower 3 is provided with a liquid output pipe 16 at the port of the conical structure for discharging liquid.

[0071] The bottom of the high flash lower column 3 is conical structure for containing liquid, the nozzle of the liquid down tube 7 extends into the liquid level, which plays a water seal role to prevent the flash steam from entering the separation cylinder 4 through the liquid down tube.

[0072] In this embodiment, the flash steam outlet 12 can discharge the flash steam into the next system for further operation, or can be transmitted to the flash steam collection device 13.

[0073] In this embodiment, the liquid output pipe 16 is arranged at the bottom of the high flash lower column 3, through which the liquid can be discharged or transmitted to the liquid collection pool 17.

[0074] Embodiment 3

[0075] According to Figure 2 As shown in the figure, the embodiment provides a method for treating coal gasification black water, which is based on the high flash column described above, and includes the following processes:

[0076] The black water discharge device 15 discharges the black water to the high flash lower column 3 for flash evaporation to form flash steam, which enters the flash steam rising cylinder 6 in the high flash lower column 3 and rises, when the flash steam in the flash steam rising cylinder 6 passes through the contraction section 19, the inner diameter of the contraction section 19 is smaller than that of the flash steam rising cylinder 6, which increases the rising speed of the flash steam and reduces the fluid pressure, so that the liquid sprayed by the spraying device forms a spray to fully contact with the flash steam, fully washing the dust mixed in the flash steam, and after the washed flash steam passes through the contraction section 19, it enters the separation cylinder 4.

[0077] The speed of the flash steam entering the separation cylinder 4 is reduced, the liquid in the flash steam falls along the side wall of the separation cylinder 4 under the action of centrifugal force and gravity, and returns to the high flash lower column 3 through the liquid down tube 7, while the flash steam follows the liquid and falls, and rises from the center of the bottom of the separation cylinder 4 to the flash steam outlet 8, and is discharged to the high flash upper column 2, and rises to the several trays 9, completing the coal gasification black water treatment work.

[0078] In summary, the present application provides a high flash tower and method for treating coal gasification black water, comprising a high flash tower body, a separation cylinder and a partition plate are arranged in the high flash tower body; wherein the partition plate separates the high flash tower body into a high flash upper tower and a high flash lower tower; the separation cylinder is provided with a flash steam rising cylinder, a liquid descending cylinder and a flash steam output port, the input end of the flash steam rising cylinder extends into the high flash lower tower through the partition plate, and the flash steam in the high flash lower tower can be effectively input into the separation cylinder, wherein the flash steam rising cylinder is provided with a contraction section on the cylinder body, which can effectively increase the rising speed of the flash steam and reduce the fluid pressure, a spraying device is arranged in the contraction section, so that the liquid sprayed by the spraying device forms a spray and fully contacts the flash steam, the spraying port of the spraying device faces the input port of the flash steam rising cylinder, which can effectively wash the flash steam entering the flash steam rising cylinder and fully wash away the dust mixed in the flash steam, thereby avoiding a series of problems such as tower tray blockage and temperature rise of the high flash tower, the contraction section on the flash steam rising cylinder can increase the rising speed of the flash steam, the liquid in the flash steam is thrown to the inner wall of the separation cylinder under the action of centrifugal force and gravity, reaches the high flash lower tower through the liquid descending cylinder, and the flash steam descends with the liquid and rises from the bottom center of the separation cylinder to the high flash upper tower through the flash steam output port, so that gas-liquid separation of the flash steam in the separation cylinder is realized, the flash steam entering the high flash upper tower is free of solid impurities, so that pipeline fouling cannot be formed, and the risk of system pipeline wear is reduced.

[0079] In the high flash tower optimization device, a separation cylinder is newly arranged in the high flash tower, when the black water reaches the high flash tower for flash evaporation through the angle valve, the flash steam reaches the inside of the separation cylinder through the flash steam rising cylinder of the separation cylinder, the flash steam rising cylinder is provided with a contraction section, the flash steam passes through the contraction section to increase the rising speed and reduce the fluid pressure, so that the liquid sprayed by the spraying device forms a spray and fully contacts the flash steam, and the dust mixed in the flash steam is fully washed, the liquid in the flash steam is thrown to the inner wall of the separation cylinder under the action of centrifugal force and gravity, reaches the high flash lower tower through the liquid descending cylinder, and the flash steam rises to the high flash upper tower through the flash steam output port, so that gas-liquid separation of the flash steam in the separation cylinder is realized, and the separation cylinder is facilitated to separate gas and liquid. The spraying device is arranged on the contraction section, so that the liquid sprayed by the spraying device forms a spray and fully contacts the flash steam, and the flash steam in the flash steam rising cylinder is washed, the dust mixed in the flash steam is washed away, and a series of problems such as tower tray blockage and temperature rise of the high flash tower are avoided.

[0080] The present application effectively solves the problems of insufficient flash evaporation, tower tray blockage, overtemperature and overpressure of the high flash tower, effectively improves black water concentration, and analyzes acid gas, and is more conducive to realizing long-term stable operation of the water system.

[0081] It should be pointed out finally that the above embodiments are only used to illustrate the technical solutions of the present application but not to limit it. Although the present application has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the specific embodiments of the present application can be modified or replaced equivalently without departing from the spirit and scope of the present application, and any modification or equivalent replacement should be covered in the protection scope of the claims of the present application.

Claims

1. A high flash tower for treating coal gasification black water, characterized by, Including high flash tower body (1); The high flash tower body (1) is provided with a separation cylinder (4), a partition plate (14) and a plurality of trays (9), and the partition plate (14) separates the high flash tower body (1) into a high flash upper tower (2) and a high flash lower tower (3); The separation cylinder (4) is provided with a flash vapor rising cylinder (6), a liquid descending cylinder (7) and a flash vapor output port (8), the output end of the flash vapor rising cylinder (6) is arranged at the top of the side end of the separation cylinder (4), the input end of the flash vapor rising cylinder (6) extends into the high flash lower tower (3) through the partition plate (14), wherein the inner diameter of the flash vapor rising cylinder (6) is smaller than the inner diameter of the separation cylinder (4); the liquid descending cylinder (7) is arranged at the bottom end of the separation cylinder (4) and is located in the high flash lower tower (3); the flash vapor output port (8) is arranged at the top of the separation cylinder (4) and is located in the high flash upper tower (2); A plurality of trays (9) are arranged in the high flash upper tower (2) in sequence and are located above the flash vapor output port (8); The flash vapor rising cylinder (6) is provided with a contraction section (19) on the cylinder body, the contraction section (19) is provided with a spraying device, and the spraying port of the spraying device is arranged towards the input port of the flash vapor rising cylinder (6); The flash vapor rising cylinder (6) comprises a first cylinder body (20) and a second cylinder body (21), the first cylinder body (20) is connected to the top of the side end of the separation cylinder (4) and is arranged on the side wall of the separation cylinder (4) in the same horizontal plane; one end of the second cylinder body (21) is in vertical communication with the first cylinder body (20), and the other end extends into the high flash lower tower (3) vertically through the partition plate (14), the contraction section (19) is arranged on the second cylinder body (21) and is located close to the first cylinder body (20); wherein the inner diameter of the contraction section (19) is smaller than the inner diameters of the first cylinder body (20) and the second cylinder body (21); The lower part of the separation cylinder (4) is in the shape of a conical body, the bottom of the conical body is in communication with the liquid descending cylinder (7) or is in communication with the liquid descending cylinder (7) through the partition plate (14); The partition plate (14) is provided with a first through hole and a second through hole, the flash vapor rising cylinder (6) extends into the high flash lower tower (3) through the first through hole, wherein the hole diameter of the first through hole corresponds to the cylinder diameter of the flash vapor rising cylinder (6), and the contact part of the flash vapor rising cylinder (6) and the first through hole is sealingly arranged, and the lower part of the separation cylinder (4) or the liquid descending cylinder (7) extends into the high flash lower tower (3) through the second through hole, wherein the hole diameter of the second through hole corresponds to the outer diameter of the lower part of the separation cylinder (4) or the liquid descending cylinder (7), and the contact part of the lower part of the separation cylinder (4) or the liquid descending cylinder (7) and the second through hole is sealingly arranged.

2. The high flash tower for treating coal gasification black water according to claim 1, characterized in that, The spraying device is two groups of spray heads (18), the two groups of spray heads (18) are arranged on the side walls of the contraction section (19) respectively, the input ends of the two groups of spray heads (18) are connected to the spraying water output device (5) through the contraction section (19) and the high flash upper tower (2), and the spraying ports of the two groups of spray heads (18) are arranged towards the input port of the second cylinder body (21).

3. The high flash tower for treating coal gasification black water according to claim 1, characterized in that, The top of the high-flash top column (2) is provided with a flash steam discharge port (12), and a plurality of trays (9) are located below the flash steam discharge port (12).

4. The high flash tower for treating coal gasification black water according to claim 3, characterized in that, The side wall of the high-flash top column (2) is further provided with a deoxygenation nozzle (22), the deoxygenation nozzle (22) is located between the flash steam discharge port (12) and the plurality of trays (9), and the nozzle is arranged to be aligned with the plurality of trays (9), and the input end of the deoxygenation nozzle (22) is connected to the deoxygenation water output device (10) through the high-flash top column (2).

5. The high flash tower for treating coal gasification black water according to claim 4, characterized in that, The high-flash top column (2) is further provided with a demister (11), and the demister (11) is located between the flash steam discharge port (12) and the deoxygenation nozzle (22).

6. The high flash tower for treating coal gasification black water according to claim 1, characterized in that, The high-flash lower column (3) is provided with a black water input port (23), the black water input port (23) is arranged close to the flash steam rising cylinder (6), the black water input port (23) is connected to the black water discharge device (15), the bottom of the high-flash lower column (3) is in a conical structure for containing liquid, the nozzle of the liquid descending cylinder (7) extends into the liquid surface, and the bottom of the high-flash lower column (3) is provided with a liquid output pipe (16) at the port of the conical structure for discharging liquid.

7. A method for treating coal gasification black water, based on the high flash tower according to any one of claims 1-6, characterized in that, The process includes the following steps: The black water entering the high-flash lower column (3) is flashed to form flash steam, the flash steam enters the flash steam rising cylinder (6) in the high-flash lower column (3) and rises, when the flash steam in the flash steam rising cylinder (6) passes through the contraction section (19), the inner diameter of the contraction section (19) is smaller than the inner diameter of the flash steam rising cylinder (6), the rising speed of the flash steam is increased and the fluid pressure is reduced, so that the liquid sprayed by the spraying device forms a spray and fully contacts the flash steam, fully washing the dust mixed in the flash steam, and after the washed flash steam passes through the contraction section (19), it enters the separation cylinder (4); The speed of the flash steam entering the separation cylinder (4) is reduced, the liquid in the flash steam descends along the side wall of the separation cylinder (4) under the action of centrifugal force and gravity, and returns to the high-flash lower column (3) through the liquid descending cylinder (7), while the flash steam descends with the liquid, and rises from the center of the bottom of the separation cylinder (4) and is discharged to the high-flash top column (2) through the flash steam output port (8), and rises into the plurality of trays (9), completing the coal gasification black water treatment work.

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