Water gas filtering device

Abstract

The utility model discloses a water gas filtering device and relates to the technical field of water gas conversion and heat recovery. The device comprises a separator, the interior of the separator comprises an upper cavity and a lower cavity, and the upper cavity and the lower cavity are communicated through a middle gas rising channel; the water gas inlet penetrates through the side wall of the separator to enter the lower cavity, the water gas outlet penetrates through the top of the separator to be communicated with the upper cavity, and a cyclone is arranged between the middle gas rising channel and the water gas outlet; an upper liquid level is established in the upper chamber, and a lower liquid level is established in the lower chamber. Scale sheets can be separated out through the lower cavity, coal ash can be separated out through the upper cavity, the content of solid impurities in water gas entering the water gas waste boiler is effectively reduced, the resistance of the water gas waste boiler is reduced, and the operation period of the water gas waste boiler is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of water-gas conversion and heat recovery, in particular to a water-gas filtering device. Background Art

[0002] The information disclosed in this background technology section is only intended to increase understanding of the overall background of the present invention, and is not necessarily regarded as an admission or any form of suggestion that the information constitutes the prior art already known to those skilled in the art.

[0003] During the water gas production process, the shift and heat recovery section primarily focuses on adjusting the hydrogen-to-carbon ratio of the syngas through the shift reaction and recovering the reaction heat. During this process, the water gas delivered from the gasification section first enters a water gas waste heat boiler (referred to as the water gas waste boiler), where the heat is used to produce steam as a by-product. The condensed water is then separated and fed into a shift furnace for reaction. In the shift furnace, the CO and H₂ contained in the syngas undergo a shift reaction over a cobalt-molybdenum catalyst, generating heat. The shifted gas output from the shift furnace undergoes a series of heat exchange processes to recover the heat and cool it to approximately 35°C.

[0004] During long-term equipment operation, fly ash carried by the water gas forms scale on the inner walls of the pipes. During startup and shutdown, as system load fluctuates, this scale flakes can enter the water gas waste boiler along with the water gas. Accumulating to a certain level, it can clog the water gas waste boiler's heat exchange tubes, increasing boiler resistance and reducing system load. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a water-gas filtering device, which adds a filtering device in front of the water-gas waste boiler to separate the fly ash and scale in the water-gas in advance and send the clean water-gas into the water-gas waste boiler to avoid blockage.

[0006] In order to achieve the above purpose, the present invention is implemented through the following technical solutions:

[0007] A water-gas filtering device includes a separator, wherein the separator comprises an upper chamber and a lower chamber, the upper chamber and the lower chamber being connected via an intermediate gas-raising passage; a water-gas inlet passes through a side wall of the separator and enters the lower chamber, and a water-gas outlet passes through a top of the separator and connects to the upper chamber; a cyclone is provided between the intermediate gas-raising passage and the water-gas outlet;

[0008] An upper liquid level is established in the upper chamber, and an upper flushing pipeline branch higher than the upper liquid level, an upper flushing pipeline branch level with the upper liquid level, and an upper drainage pipeline lower than the upper liquid level are provided in the upper chamber; a lower liquid level is established in the lower chamber, and a lower flushing pipeline lower than the lower liquid level and a lower drainage pipeline lower than the lower flushing pipeline are provided in the lower chamber.

[0009] Optionally, a slag discharge pipeline and a bottom liquid discharge pipeline are provided at the bottom of the lower chamber.

[0010] Optionally, a cyclone flushing pipeline is provided in the upper chamber, and the cyclone flushing pipeline extends into the cyclone chamber of the cyclone separator.

[0011] Optionally, an upper liquid level gauge is provided on the outside of the upper chamber of the separator, and the upper liquid level gauge is connected to the upper chamber through the first upper root valve and the first lower root valve, and the inlet of the upper flushing pipeline is located between the first upper root valve and the first lower root valve.

[0012] Optionally, a lower liquid level gauge is provided on the outside of the lower chamber of the separator, and the lower liquid level gauge is connected to the lower chamber through the second upper root valve and the second lower root valve, and the inlet of the lower flushing pipeline is lower than the second upper root valve and the second lower root valve.

[0013] Optionally, a buffer baffle is provided between the water-gas inlet and the intermediate gas-raising channel, and the bottom end of the buffer baffle is located above the lower liquid level.

[0014] Optionally, the cyclone air inlet is located above the upper liquid level.

[0015] Optionally, the water-gas inlet and the water-gas outlet are respectively provided with electric valves.

[0016] Optionally, the intermediate air lifting channel is located at the center of a horizontal cross section of the separator, and the cyclones of the cyclone separator are distributed around the periphery of the intermediate air lifting channel.

[0017] Optionally, the upper flushing pipeline, the lower flushing pipeline and the cyclone flushing pipeline are respectively connected to the boiler water network; the upper drainage pipeline, the lower drainage pipeline and the bottom drainage pipeline are respectively connected to the conversion condensate tank.

[0018] The beneficial effects of the utility model are as follows:

[0019] This utility model adds a filter device before the water-gas waste boiler. The separator in the filter device includes an upper chamber and a lower chamber, each with established liquid levels. The lower chamber can separate scale flakes, while the upper chamber can separate coal ash. This effectively reduces the content of solid impurities in the water-gas entering the water-gas waste boiler, extends the water-gas waste boiler's operating cycle, reduces the water-gas waste boiler's resistance, effectively increases the system's effective load, and reduces energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0021] In order to show the positions of various parts, the distances or sizes between them are exaggerated in the figure, and the schematic diagram is for reference only.

[0022] Figure 1 Schematic diagram of the structure of the separator in Example 1.

[0023] Among them, 1. First electric valve; 2. Second electric valve; 3. Third valve; 4. Fourth valve; 5. Fifth valve; 6. Sixth valve; 7. Seventh valve; 8. Eighth valve; 9. Ninth valve; 10. Separator; 11. Lower chamber; 12. Upper chamber; 13. Intermediate air rising channel; 14. Buffer baffle; 15. Upper liquid level gauge; 16. Lower liquid level gauge; 17. Upper liquid level; 18. Lower liquid level; 19. Cyclone. DETAILED DESCRIPTION

[0024] Example 1

[0025] A water gas filtering device, such as Figure 1 As shown, the separator 10 includes an upper chamber 12 and a lower chamber 11, which are connected by an intermediate gas-raising passage 13. The water-gas inlet passes through the side wall of the separator 10 and enters the lower chamber 11. The water-gas outlet passes through the top of the separator 10 and is connected to the upper chamber 12. A cyclone 19 is provided between the intermediate gas-raising passage 13 and the water-gas outlet.

[0026] An upper liquid level 17 is established in the upper chamber 12, and an upper flushing pipeline branch higher than the upper liquid level 17, an upper flushing pipeline branch level with the upper liquid level 17, and an upper drainage pipeline lower than the upper liquid level 17 are provided in the upper chamber 12; a lower liquid level 18 is established in the lower chamber 11, and a lower flushing pipeline lower than the lower liquid level 18 and a lower drainage pipeline lower than the lower flushing pipeline are provided in the lower chamber 11.

[0027] Through the above arrangement, scale flakes are separated in the lower chamber 11, and dust such as fly ash is separated in the upper chamber 12, thereby reducing the amount of solid impurities entering the water-gas waste boiler and lowering the resistance of the water-gas waste boiler. The upper liquid level 17 is located between the upper flushing line and the upper drainage line, allowing the flushing water discharged from the upper flushing line to capture the dust separated by the cyclone 19 and discharge it through the upper drainage line. The higher lower liquid level 18 is established primarily to flush out larger ash particles. Lower liquid level 18 is higher than the lower flushing line, allowing the flushing water below to fully agitate the waste liquid containing scale flakes, allowing the scale flakes in the waste liquid below to be discharged through the lower drainage line.

[0028] In the upper flushing pipeline, the branch that is level with the upper liquid level 17 is used to flush and collect the coal ash dust separated by the cyclone 19, and the branch that is higher than the upper liquid level 17 is used to clean the coal ash dust accumulated at the water-gas inlet of the cyclone 19 and the water-gas passage of the cyclone 19. After this part of the dust is flushed down by the flushing water, it is carried upward from the inner tube of the cyclone 19 by the water gas together with the water vapor or water mist generated by the flushing water, so as to avoid clogging the water-gas passage or accumulating for a long time to form large scale flakes.

[0029] A first electric valve 1 is provided at the water-gas inlet for controlling the on-off state of the water-gas inlet; a second electric valve 2 is provided at the water-gas outlet for controlling the on-off state of the water-gas outlet; a third valve 3 is provided at the upper flushing pipeline for controlling the on-off state of the upper flushing pipeline; a fourth valve 4 is provided at the upper drainage pipeline for controlling the on-off state of the upper drainage pipeline; a fifth valve 5 is provided at the lower flushing pipeline for controlling the on-off state of the lower flushing pipeline; a sixth valve 6 is provided at the lower drainage pipeline for controlling the on-off state of the lower drainage pipeline.

[0030] A slag discharge pipeline and a bottom liquid discharge pipeline are provided at the bottom of the lower chamber 11; the bottom liquid discharge pipeline is provided with a seventh valve 7 for controlling the on-off state of the bottom liquid discharge pipeline; the slag discharge pipeline is provided with an eighth valve 8 for controlling the on-off state of the slag discharge pipeline; the slag discharge pipeline is mainly used for discharging large pieces of coal slag and scale flakes at the bottom, and the bottom liquid discharge pipeline is used to quickly empty the lower liquid level 18 of the separator 10 during maintenance.

[0031] The flow direction of the water gas is changed by the action of the buffer baffle 14, which promotes the separation of the gas from the solid impurities contained therein; the lower liquid level 18 is lower than the lowest end of the buffer baffle 14, avoiding the formation of an unstable air pressure difference on both sides of the buffer baffle 14, so that the device in the upper chamber 12 can operate smoothly under stable air pressure.

[0032] A cyclone flushing pipeline is provided in the upper chamber 12, and the cyclone flushing pipeline extends into the cyclone 19 chamber of the cyclone separator; the cyclone flushing pipeline is provided with a ninth valve 9 for controlling the on-off state of the cyclone flushing pipeline; the cyclone flushing pipeline can be flushed with flushing water when the cyclone 19 is blocked, thereby ensuring the normal operation of the device.

[0033] The difference between the branch above the upper liquid level 17 in the upper flushing pipeline and the cyclone flushing pipeline is that the cyclone flushing pipeline is used for flushing when the cyclone 19 is blocked, and the branch above the upper liquid level 17 in the upper flushing pipeline is used for daily flushing.

[0034] An upper liquid level gauge 15 is provided on the outside of the upper chamber 12 of the separator 10. The upper liquid level gauge 15 is connected to the upper chamber 12 through the first upper root valve and the first lower root valve. The inlet of the upper flushing pipeline is located between the first upper root valve and the first lower root valve, which is convenient for flushing and drainage.

[0035] A lower liquid level gauge 16 is provided on the outside of the lower chamber 11 of the separator 10. The lower liquid level gauge 16 is connected to the lower chamber 11 through the second upper root valve and the second lower root valve. The inlet of the lower flushing pipeline is lower than the second upper root valve and the second lower root valve. Liquid level gauges are provided in the upper and lower parts respectively because the upper and lower parts are relatively independent flushing systems, and both need to maintain a certain liquid level to ensure the safe operation of the system.

[0036] The air inlet of the cyclone 19 is located above the upper liquid level 17. The water gas first enters the cyclone 19, and the gas rises from the cyclone 19 pipeline, and finally converges at the top of the separator 10, and leaves the separator 10 from the outlet. The fly ash dust in the water gas is separated by the cyclone 19, falls into the chamber where the upper liquid level 17 is located or adheres to the side wall, and is flushed by the flushing water input through the third valve 3. The fly ash dust is taken away by the flushing and water flow force and discharged from the drain port equipped with the fourth valve 4.

[0037] The middle air-lift channel 13 is located at the center of the horizontal cross section of the separator 10 , and the cyclones 19 of the cyclone separator are distributed around the periphery of the middle air-lift channel 13 .

[0038] The upper flushing pipeline, the lower flushing pipeline and the cyclone flushing pipeline are respectively connected to the boiler water network; the upper drain pipeline, the lower drain pipeline and the bottom drain pipeline are respectively connected to the conversion condensate tank; so as to be combined with the entire water gas production system to facilitate the effective utilization of resources.

[0039] The operation scenario and process of the water gas filter device of this embodiment are as follows:

[0040] Affected by the ash and scale in the water gas, the water gas waste boiler will be clogged every 3-4 months. When the blockage reaches a certain level and the resistance of the water gas waste boiler is greater than 0.4Mpa, the water gas waste boiler tube plate may break, the water gas waste boiler partition bolts will be pulled off, the partition will be deformed, and the water gas will flow from the deformed partition. The water gas waste boiler cannot effectively exchange heat, and the heat will be transferred backward, causing the low-pressure waste boiler to be overloaded, resulting in a safety hazard in the conversion operation. In order to solve this problem, a water gas filter device in this embodiment is added in front of the water gas waste boiler to separate the coal ash and scale in the water gas and send clean water gas into the water gas waste boiler. The specific process is as follows:

[0041] First, open the third valve 3 and the fifth valve 5 to establish the liquid levels in the upper chamber 12 and the lower chamber 11 of the separator 10 respectively, then open the fourth valve 4 and the seventh valve 7 to keep the liquid level balanced at about 40%, and then open the first electric valve 1 and the second electric valve 2 to allow the water gas to enter the separator 10 for separation and then enter the water gas waste boiler.

[0042] The water gas enters the lower chamber 11 of the separator 10 through the water gas inlet, and is blocked by the buffer baffle 14 at the inlet. The large scale pieces are separated by gravity sedimentation, and then the water gas rises from the middle gas rising channel 13 and returns to the bottom of the surrounding cyclone 19. After entering from the bottom of the cyclone 19, the water gas rises and is collected from the top of the separator 10 and then sent out of the separator 10. The dust in the water gas is separated by centrifugal force in the cyclone and discharged from the bottom of the cyclone and then discharged after being flushed with flushing water; liquid levels are established in the lower chamber 11 and the upper chamber 12 respectively to prevent high pressure from flowing into low pressure.

[0043] The device of the utility model can increase the operation cycle of the water-gas waste boiler from 6 months to 12 months, reduce the number of system shutdowns and maintenance, reduce start-up, shutdown and maintenance costs, increase the system operating load, and ensure safe and stable operation of the system.

[0044] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A water gas filtering device, comprising a separator, characterized in that: The separator includes an upper chamber and a lower chamber, the upper chamber and the lower chamber being connected via an intermediate gas-raising channel; a water-gas inlet passes through the side wall of the separator to enter the lower chamber, and a water-gas outlet passes through the top of the separator to connect to the upper chamber; a cyclone is provided between the intermediate gas-raising channel and the water-gas outlet; An upper liquid level is established in the upper chamber, and an upper flushing pipeline branch higher than the upper liquid level, an upper flushing pipeline branch level with the upper liquid level, and an upper drainage pipeline lower than the upper liquid level are provided in the upper chamber; a lower liquid level is established in the lower chamber, and a lower flushing pipeline lower than the lower liquid level and a lower drainage pipeline lower than the lower flushing pipeline are provided in the lower chamber.

2. A water gas filtering device according to claim 1, characterized in that: The bottom of the lower chamber is provided with a slag discharge pipeline and a bottom liquid discharge pipeline; the bottom liquid discharge pipeline is provided with a seventh valve; and the slag discharge pipeline is provided with an eighth valve.

3. A water gas filtering device according to claim 1, characterized in that: A cyclone flushing pipeline is provided in the upper chamber, and the cyclone flushing pipeline extends into the cyclone chamber of the cyclone separator.

4. A water gas filtering device according to claim 3, characterized in that: The cyclone flushing pipeline is provided with a ninth valve.

5. The water gas filtering device according to claim 1, characterized in that: An upper liquid level gauge is provided outside the upper chamber of the separator, and the upper liquid level gauge is connected to the upper chamber through a first upper root valve and a first lower root valve. The inlet of the upper flushing pipeline is located between the first upper root valve and the first lower root valve.

6. The water gas filtering device according to claim 1, characterized in that: A lower liquid level gauge is provided outside the lower chamber of the separator, and the lower liquid level gauge is connected to the lower chamber through the second upper root valve and the second lower root valve. The inlet of the lower flushing pipeline is lower than the second upper root valve and the second lower root valve.

7. The water gas filtering device according to claim 1, characterized in that: A buffer baffle is provided between the water-gas inlet and the intermediate gas-raising channel, and the lower liquid level is lower than the lowest end of the buffer baffle.

8. The water gas filtering device according to claim 1, characterized in that: The water gas inlet and the water gas outlet are respectively provided with electric valves; the upper flushing pipeline is provided with a third valve; the upper drainage pipeline is provided with a fourth valve; the lower flushing pipeline is provided with a fifth valve; and the lower drainage pipeline is provided with a sixth valve.

9. The water gas filtering device according to claim 1, characterized in that: The intermediate air lifting channel is located at the center of the horizontal cross section of the separator, and the cyclones of the separator are distributed on the periphery of the intermediate air lifting channel.

10. The water gas filtering device according to any one of claims 1 to 9, characterized in that: The upper flushing pipeline, the lower flushing pipeline and the cyclone flushing pipeline are respectively connected to the boiler water network; the upper drain pipeline, the lower drain pipeline and the bottom drain pipeline are respectively connected to the conversion condensate tank.

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