An online slag discharge device and method for a supercritical water gasification reactor

Abstract

The present invention discloses an online slag discharge device and method for a supercritical water gasification reactor, comprising a quenching chamber, a slag lock hopper, and a slag storage tank. The upper portion of the quenching chamber is connected to the reactor slag outlet, a magnetic screw paddle is provided in the connecting section between the slag outlet and the quenching chamber, a slag discharge valve and a screw paddle are provided in the connecting section between the quenching chamber and the slag lock hopper, a slag discharge valve is provided at the bottom of the slag lock hopper, and a pressure relief valve is provided at the top. Utilizing the online slag discharge device and method of the present invention, the residue in the reactor can be continuously and uninterruptedly discharged without causing pressure fluctuations within the reactor; blockage of the slag discharge pipeline can be prevented; and autonomous regulation of the slag discharge volume can be achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of clean energy conversion and organic solid waste treatment, and particularly relates to an online slag discharge device and method for a supercritical water gasification reactor. Background Art

[0002] Supercritical water gasification has attracted widespread attention due to its high efficiency and low cost. However, raw carbon-containing organic feedstocks such as coal and biomass inevitably contain inorganic mineral components. In supercritical water, these inorganic mineral components precipitate as solid residues after the organic matter is gasified. Discharging this solid residue online from continuous supercritical water gasification reactors without disrupting the reactor's continuous and stable operation has long been a challenge for supercritical water gasification technology.

[0003] Existing methods demonstrate good slag removal performance in laboratory-scale and pilot-scale experimental systems. However, differential pressure-driven slag removal devices and methods can cause slight pressure fluctuations in the reactor, which has little impact on gasification processes focused on gas production. However, the industrialization of supercritical water gasification technology often goes beyond gas production and may involve coupled processes such as power generation. Therefore, ensuring stable pressure throughout the entire system is crucial for industrial-scale supercritical water gasification processes. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an online slag discharge device and method for a supercritical water gasification reactor in response to the above-mentioned deficiencies in the prior art, so as to solve the technical problem of pressure fluctuation in the reactor during the online slag discharge process of the existing supercritical water gasification reactor.

[0005] The present invention adopts the following technical solutions:

[0006] An online slag discharge device for a supercritical water gasification reactor comprises a quenching chamber, the top of which is connected to the reactor slag outlet, a magnetic screw paddle being provided in the connecting section between the reactor slag outlet and the quenching chamber; one side of the bottom of the quenching chamber is connected to a slag lock hopper; the quenching chamber and the slag lock hopper are respectively connected to a cooling water circulation system.

[0007] Specifically, the cooling water circulation system includes a water tank, and the water returns to the water tank after passing through a circulating water pump, a circulating water pump valve, a quenching chamber and a cooling tower.

[0008] Furthermore, the water tank is connected to the pressurized water inlet provided on the slag lock bucket via a pressurized water pump and a pressurized valve.

[0009] Specifically, a slag discharge valve and a screw propeller are provided in the connection section between the quenching chamber and the slag lock bucket, and the screw propeller can move along the axis direction.

[0010] Furthermore, the angle between the connecting section between the quenching chamber and the slag lock bucket and the vertical direction is 30 to 60 degrees.

[0011] Specifically, a pressure relief valve is provided on the top of the slag lock bucket, a slag unloading valve is provided on the bottom, a slag storage pool is provided below the slag unloading valve, and the pressure relief valve is connected to the slag storage pool through a pipeline.

[0012] Specifically, a first pressure monitor and a first temperature monitor are provided on the top of the quenching chamber, a second temperature monitor is provided at the bottom outlet, a second pressure monitor is provided at the inlet of the slag lock bucket, and a third pressure monitor is provided on the top.

[0013] Specifically, the magnetic screw propeller is arranged vertically.

[0014] Specifically, the quenching chamber is a jacketed heat exchanger. Another technical solution of the present invention is an online slag removal method for a supercritical water gasification reactor, comprising the following steps:

[0015] S1, the slag lock hopper is pressurized to the same pressure as the reactor;

[0016] S2, start the magnetic screw paddle, and the solid phase residue flows from the reactor slag outlet through the magnetic screw paddle into the quenching chamber to be cooled;

[0017] S3, discharging the solid phase residue cooled to room temperature in step S2 into a slag lock hopper, adjusting the pressure in the slag lock hopper to normal pressure, and discharging the residue in the slag lock hopper;

[0018] When the connection section between the quenching chamber and the slag lock bucket is blocked, the screw paddle provided in the connection section is used to clear it. When the residue in the slag lock bucket accumulates to a certain amount, the introduction of solid residue is stopped.

[0019] Compared with the prior art, the present invention has at least the following beneficial effects:

[0020] An online slag discharge device for a supercritical water gasification reactor achieves autonomous regulation of slag discharge efficiency to meet slag discharge requirements under different operating conditions; prevents blockage of the reactor slag outlet; does not require consumption of additional water during the slag discharge process; places the entire magnetic screw paddle inside a quenching chamber, eliminating the need to consider inter-axial sealing issues of rotating components; applies an axially movable screw paddle to clear the slag discharge valve pipeline, allowing for more flexible improvement of pipeline blockage; and does not affect the safe and stable operation of the reactor during online operation, meeting the technical requirements of industrial applications.

[0021] Furthermore, the cooling water circulation system realizes zero-discharge recycling of cooling water while cooling the solid-phase residue.

[0022] Furthermore, the internal pressure is replenished before the slag lock bucket is activated.

[0023] Furthermore, the screw propeller that can move along the axis direction can flexibly improve the slag blockage problem of the connecting pipe section between the quenching chamber and the slag lock bucket; the slag discharge valve can ensure that the quenching chamber and the slag lock bucket are completely isolated when the slag lock bucket is depressurized and the slag is cleared.

[0024] Furthermore, the angle between the connecting section and the vertical direction is 30 to 60 degrees, which can enable the residue to flow smoothly into the slag lock bucket, and the slag lock bucket can be flexibly arranged according to on-site construction requirements.

[0025] Furthermore, the provision of a pressure relief valve, a slag unloading valve and a slag storage pool can ensure smooth and stable pressure relief and slag cleaning of the slag lock bucket as well as slag storage.

[0026] Furthermore, the temperature monitors and pressure monitors installed in the quenching chamber and the slag lock bucket respectively can realize online monitoring of the fluid temperature and pressure in key parts during the operation of the device, and grasp the operating status of the device in real time.

[0027] Furthermore, the vertical setting of the magnetic screw paddle can achieve smooth discharge of slag in the reactor and reduce wear of the screw; the speed of the magnetic screw paddle is adjustable, which realizes autonomous control of the slag discharge efficiency; the magnetic screw paddle is located as a whole inside the quenching chamber, so there is no need to consider the inter-axial sealing problem of the rotating parts of the magnetic screw paddle under high-pressure environment.

[0028] Furthermore, the setting of the jacketed heat exchanger realizes the physical isolation of the cooling water circulation system and the quenching chamber. The operating pressure of the jacketed heat exchanger is not affected by the pressure inside the reactor, ensuring the efficient, safe and stable operation of the cooling water circulation system.

[0029] The invention discloses an online slag discharge method for a supercritical water gasification reactor, which realizes continuous, stable and uninterrupted discharge of slag in the reactor without disturbing the pressure in the reactor.

[0030] In summary, the present invention can achieve online continuous and stable discharge of solid-phase residue from a reactor, as well as online cooling of the solid-phase residue.

[0031] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of the present invention.

[0033] Among them: 1. Quenching chamber; 2. Slag lock hopper; 3. Slag storage tank; 4. Reactor slag outlet; 5. Magnetic screw paddle; 6. Slag discharge valve; 7. Screw paddle; 8. Slag unloading valve; 9. Pressure relief valve; 10. Jacket; 11. Circulating water pump; 12. Circulating water pump valve; 13. Cooling tower; 14. Water tank; 15. First pressure monitor; 16. First temperature monitor; 17. Second temperature monitor; 18. Second pressure monitor; 19. Third pressure monitor; 20. Charging water pump; 21. Charging valve. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "one side", "one end", "one side" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0036] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0037] It will be understood that when used in this specification and the appended claims, the terms “comprises” and “comprising” indicate the presence of described features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0038] It should also be understood that the terms used in the present specification are only for the purpose of describing particular embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0039] It should be further understood that the term "and / or" used in the present description and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0040] The accompanying drawings illustrate various schematic diagrams of structures according to embodiments disclosed herein. These figures are not drawn to scale; for clarity, some details are exaggerated and some details may be omitted. The shapes of the various regions and layers shown in the figures, as well as their relative sizes and positional relationships, are merely exemplary and may deviate in practice due to manufacturing tolerances or technical limitations. Those skilled in the art may design regions / layers with different shapes, sizes, and relative positions as needed.

[0041] The present invention provides an online slag discharge device and method for a supercritical water gasification reactor. The power for discharging the residue from the reactor is the residue's own gravity and the rotational entrainment of a magnetic screw propeller. This device can achieve continuous and uninterrupted discharge of the residue in the reactor without causing pressure fluctuations in the reactor. It can also prevent blockage of the slag discharge pipeline and achieve autonomous regulation of the slag discharge amount.

[0042] See also Figure 1 The present invention provides an online slag discharge device for a supercritical water gasification reactor, comprising a quenching chamber 1, a slag lock hopper 2 and a slag storage pool 3; the upper part of the quenching chamber 1 is connected to the reactor slag outlet 4, and a magnetic screw paddle 5 is provided in the connecting section between the reactor slag outlet 4 and the quenching chamber 1; a slag discharge valve 6 and a screw paddle 7 are provided in the connecting section between the quenching chamber 1 and the slag lock hopper 2; a pressure relief valve 9 is provided on the top of the slag lock hopper 2, and a slag discharge valve 8 is provided on the bottom, and the slag storage pool 3 is located below the slag discharge valve 8.

[0043] The quenching chamber 1 is a jacketed heat exchanger; the cooling water returns to the water tank 14 through the jacket 10 provided on the quenching chamber 1 .

[0044] In another embodiment of the present invention, the cooling water is transported by a circulating water pump 11 and flows through a circulating water pump valve 12 ; the cooling water flowing out of the jacket 10 is cooled to room temperature after passing through a cooling tower 13 and circulated to a water tank 14 .

[0045] In another embodiment of the present invention, a first pressure monitor 15 and a first temperature monitor 16 are provided at the top of the quenching chamber 1 , and a second temperature monitor 17 is provided at the bottom outlet.

[0046] In another embodiment of the present invention, a second pressure monitor 18 is provided at the inlet of the slag lock hopper 2, and a third pressure monitor 19 is provided at the top.

[0047] In the embodiment of the present invention, the temperature monitor and the pressure monitor are used to monitor the temperature and pressure at corresponding positions respectively, to grasp the operating status of the online slag discharge device in real time, and to provide data basis for timely adjustment of the operating parameters of the online slag discharge device.

[0048] A pressurized water inlet is provided on the slag lock bucket 2, which is connected to the pressurized water pump 20. A pressurized valve 21 is provided between the pressurized water inlet and the pressurized water pump. The pressurized water pump 20 and the pressurized valve 21 can realize pressurization and flushing of the slag lock bucket.

[0049] The power for discharging the solid residue from the reactor slag outlet is the gravity of the slag itself and the entrainment during the rotation of the magnetic screw paddle 5 .

[0050] In another embodiment of the present invention, the magnetic screw propeller 5 is entirely placed inside the quenching chamber 1, and there is no need to consider the sealing problem of the rotating parts.

[0051] In another embodiment of the present invention, the rotation speed of the magnetic screw paddle 5 is adjustable between 0 and 60 rpm, thereby achieving different slag discharge efficiencies.

[0052] In another embodiment of the present invention, the slag discharge device of the present invention is further provided with a screw paddle 7 .

[0053] In another embodiment of the present invention, the screw paddle 7 can move along the axial direction to enable the screw paddle 7 to pass through or move away from the slag discharge valve 6 .

[0054] The screw paddle 7 can clear the upstream and downstream pipelines of the slag discharge valve 6 and ensure the normal closing of the slag discharge valve 6.

[0055] The quenching chamber 1 can ensure that the solid-liquid mixture at the bottom outlet of the quenching chamber is cooled to room temperature.

[0056] The pressure relief valve 9 can release the pressure in the slag lock hopper 2 to normal pressure.

[0057] In another embodiment of the present invention, the quench chamber 1 is located directly below the slag outlet 4 of the reactor.

[0058] In another embodiment of the present invention, the magnetic screw propeller 5 is arranged vertically.

[0059] In another embodiment of the present invention, the slag lock bucket 2 is located on the side of the bottom of the quenching chamber 1; the upstream and downstream pipelines of the slag discharge valve 6 form a certain angle with the vertical direction, and the angle is 30 to 60 degrees.

[0060] In another embodiment of the present invention, the slag inlet of the slag lock hopper 2 is located on the side wall of the slag lock hopper 2 .

[0061] The online slag discharge method of a supercritical water gasification reactor of the present invention is implemented based on the online slag discharge device of the supercritical water gasification reactor provided by the present invention. The slag discharge operation steps are as follows:

[0062] S1. Open the pressure charging valve 21 and start the pressure charging water pump 20 to pressurize the slag lock hopper 2 to the same pressure as the pressure in the reactor;

[0063] S2, open the slag discharge valve 6, start the magnetic screw paddle 5, and the solid phase residue flows from the reactor slag outlet 4 through the magnetic screw paddle 5 into the quenching chamber 1 to be cooled;

[0064] S3, the solid residue cooled to room temperature flows from the outlet of the quenching chamber 1 through the slag discharge valve 6 into the slag lock hopper 2;

[0065] S4. When the upstream and downstream pipelines of the slag discharge valve 6 are blocked, start the screw paddle 7 to clear the blockage in time. When the residue in the slag lock hopper 2 accumulates to a certain amount, ensure that the screw paddle 7 is away from the slag discharge valve 6, and close the slag discharge valve 6.

[0066] S5. Adjust the pressure relief valve 6 to release the pressure in the slag lock hopper 2 to normal pressure steadily;

[0067] S6. Open the slag unloading valve 8 to unload the residue in the slag lock hopper 2 into the slag storage tank 3; close the slag unloading valve 8 and the pressure relief valve 6; repeat steps S1 to S5, i.e. enter a new round of continuous slag loading into the slag lock hopper.

[0068] In the slag discharge method provided by the present invention, the magnetic screw propeller is always in a continuous rotation operation state regardless of whether the slag discharge valve is opened, thereby ensuring the continuous and stable output of the slag in the reactor.

[0069] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0070] In summary, the present invention provides an online slag discharge device and method for a supercritical water gasification reactor, which uses a magnetic screw paddle for online slag discharge from a supercritical water gasification reactor, and has many advantages:

[0071] (1) It can realize the autonomous regulation of slag discharge efficiency; it can prevent the blockage of the reactor slag outlet; the slag discharge process does not require the consumption of additional water; the entire magnetic screw propeller is placed inside the quenching chamber, and there is no need to consider the inter-axial sealing problem of the rotating parts.

[0072] (2) Applying the screw propeller that can realize axial movement to clear the slag discharge valve pipeline can more flexibly improve the blockage of the pipeline.

[0073] The above content is only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A method for online slag removal from a supercritical water gasification reactor, characterized in that: An online slag discharge device for a supercritical water gasification reactor comprises a quenching chamber (1), the top of the quenching chamber (1) being connected to a reactor slag outlet (4), a magnetic screw paddle (5) being provided in a connection section between the reactor slag outlet (4) and the quenching chamber (1); one side of the bottom of the quenching chamber (1) being connected to a slag lock hopper (2); the quenching chamber (1) and the slag lock hopper (2) being respectively connected to a cooling water circulation system, the cooling water circulation system comprising a water tank (14), the water tank (14) returning to the water tank (14) after passing through a circulating water pump (11), a circulating water pump valve (12), the quenching chamber (1) and a cooling water tower (13); the water tank (14) being connected to a pressurized water inlet provided on the slag lock hopper (2) via a pressurized water pump (20) and a pressurized valve (21); A pressure relief valve (9) is provided on the top of the slag lock hopper (2), a slag discharge valve (8) is provided on the bottom, a slag storage tank (3) is provided below the slag discharge valve (8), and the pressure relief valve (9) is connected to the slag storage tank (3) through a pipeline; A first pressure monitor (15) and a first temperature monitor (16) are provided at the top of the quenching chamber (1), a second temperature monitor (17) is provided at the bottom outlet, a second pressure monitor (18) is provided at the inlet of the slag lock hopper (2), and a third pressure monitor (19) is provided at the top, comprising the following steps: S1, the slag lock hopper is pressurized to the same pressure as the reactor; S2, start the magnetic screw paddle, and the solid phase residue flows from the reactor slag outlet through the magnetic screw paddle into the quenching chamber to be cooled; S3, discharging the solid phase residue cooled to room temperature in step S2 into the slag lock hopper. When the residue in the slag lock hopper accumulates to a certain amount, stop feeding the solid phase residue, adjust the pressure in the slag lock hopper to normal pressure, and discharge the residue in the slag lock hopper; When the connection section between the quenching chamber and the slag lock bucket is blocked, the screw paddle provided in the connection section is used to clear it.

2. The online slag removal method for a supercritical water gasification reactor according to claim 1, characterized in that: A slag discharge valve (6) and a screw propeller (7) are provided in the connection section between the quenching chamber (1) and the slag lock bucket (2), and the screw propeller (7) is capable of moving along the axial direction.

3. The online slag removal method for a supercritical water gasification reactor according to claim 2, characterized in that: The angle between the connection section between the quenching chamber (1) and the slag lock bucket (2) and the vertical direction is 30 to 60 degrees.

4. The online slag removal method for a supercritical water gasification reactor according to claim 1, characterized in that: The magnetic screw propeller (5) is arranged vertically.

5. The online slag removal method for a supercritical water gasification reactor according to claim 1, characterized in that: The quenching chamber (1) is a jacketed heat exchanger.

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