Pressurized gasification device adopting heat storage and supply

Abstract

A pressurized gasification device adopting heat storage and supply comprises a pure oxygen pipe, a pulverized coal pipe, a cyclone combustion cylinder, a heat storage device I, a heat storage device II, a gasification agent pipe, a temperature detector, a high-pressure fan, a gasification agent nozzle, a gasification furnace, a gasification furnace grate, a coal bunker, a coal lock, a coal lock upper valve, a coal lock lower valve, a chilling chamber and a slag pool. High-temperature flue gas generated by pure oxygen combustion of pulverized coal enters the heat storage device for heat storage, heat is transmitted to a gasifying agent and then is fed into the gasification furnace, the situation that conventional air combustion influences the efficiency of the gasification furnace and direct combustion of lump coal in the gasification furnace is avoided, the operation cost of the gasification furnace is reduced, meanwhile, heat is provided for the gasification furnace in an external heat supply mode, and energy is saved. The operation flexibility of the gasifier is improved.

Description

Technical Field

[0001] This invention relates to the field of clean coal utilization technology, specifically to a pressurized gasification device that uses thermal storage for heating. Background Technology

[0002] Coal gasification technology is a core technology for the clean and efficient conversion of coal. Currently, gasifiers widely used in industry generally employ pressurized gasification, which enhances the gasification process and increases syngas production and efficiency by increasing reaction pressure. Among them, fixed-bed gasifiers are widely used due to their high conversion rate and low ash content in the produced gas. During the operation of a fixed-bed gasifier, fuel undergoes combustion in the high-temperature oxidation layer, releasing a large amount of heat. The high-temperature flue gas then transfers this heat to the subsequent pyrolysis and drying layers, thus completing the preheating and gasification of the fuel. However, this technology has certain limitations: First, fixed-bed gasification requires relatively expensive lump coal as raw material, and some of the raw material is directly burned for heating within the furnace, resulting in a waste of high-quality raw materials and increasing operating costs; second, due to the direct heating method within the furnace, the gasifier's load regulation capability is poor, making it difficult to flexibly adjust operating conditions according to actual needs. Summary of the Invention

[0003] To address the shortcomings of existing pressurized gasification devices, such as high operating costs and poor load regulation capabilities, the present invention aims to provide a pressurized gasification device that employs heat storage for heating.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a pressurized gasification device using heat storage and heating, comprising a pure oxygen pipe 1, a pulverized coal pipe 2, a cyclone combustion cylinder 3, a heat storage device I 4, a heat storage device II 5, a gasifying agent pipe 6, a temperature detector 7, a high-pressure blower 8, a gasifying agent nozzle 9, a gasifier 10, a gasifier grate 11, a coal bunker 12, a coal lock 13, an upper valve of the coal lock 14, a lower valve of the coal lock 15, a quench chamber 16, and a slag pool 17.

[0005] Pure oxygen is introduced into the pure oxygen pipe 1, carrying the pulverized coal from the pulverized coal pipe 2 into the cyclone combustion chamber 3 for combustion.

[0006] The outlet of the cyclone combustion cylinder 3 and the gasifying agent pipe 6 are both connected to the heat storage device I4 and the heat storage device II5. The heat storage device I4 is equipped with four valves, namely the flue gas inlet valve 401, the gasifying agent outlet valve 402, the gasifying agent inlet valve 403 and the flue gas outlet valve 404. The heat storage device II5 is also equipped with four valves, namely the flue gas inlet valve 501, the gasifying agent outlet valve 502, the gasifying agent inlet valve 503 and the flue gas outlet valve 504.

[0007] Temperature sensors 7 are installed after the gasifying agent outlet valve 402 of the heat storage device I4 and the gasifying agent outlet valve 502 of the heat storage device II5. A high-pressure blower 8 is arranged after the temperature sensor 7, and the outlet of the high-pressure blower 8 is connected to the gasifying agent nozzle 9 of the gasifier 10.

[0008] The gasifier 10 is equipped with a gasifier grate 11, which has a multi-layer structure. The outermost layer is a refractory material layer 101, the middle layer is a silicon carbide coating 102, the inner layer is a high-temperature alloy steel pipe 103, and the middle layer is a cooling water pipe 104.

[0009] A coal bunker 12 and a coal lock 13 are provided above the gasifier 10. An upper coal lock valve 14 and a lower coal lock valve 15 are respectively provided above and below the coal lock 13.

[0010] A quench chamber 16 and a slag pool 17 are provided below the gasifier 10.

[0011] Compared with existing pressurized gasification devices, the present invention has the following advantages.

[0012] This invention provides a pressurized gasification device that uses heat storage and heat supply. The high-temperature flue gas generated by the pure oxygen combustion of pulverized coal exchanges heat with the gasifying agent to provide heat to the gasifier, thus avoiding the high nitrogen content caused by conventional air combustion from affecting the gasifier efficiency.

[0013] The present invention provides a pressurized gasification device with heat storage and heat supply, which uses the combustion of pulverized coal to provide heat, avoiding the direct combustion of lump coal in existing gasification devices and reducing the operating cost of the gasifier.

[0014] The present invention discloses a pressurized gasification device that uses heat storage for heating. By utilizing a heat storage device, heat is provided to the gasifier for operation in the form of external heating, thereby improving the gasification efficiency of the gasifier and enabling flexible adjustment of the gasifier's operating load. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a pressurized gasification device using heat storage for heating according to the present invention.

[0016] Figure 2 This is a structural diagram of the gasifier grate of a pressurized gasification device using all-oxygen combustion heating according to the present invention. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0018] In the description of this invention, it should be noted that the terms "top," "bottom," "one side," "the other side," "front," "rear," "middle part," "inner," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0019] The present invention will now be described in further detail with reference to the accompanying drawings.

[0020] like Figure 1 Figure 2 As shown, the present invention provides a pressurized gasification device using heat storage heating, including a pure oxygen pipe 1, a pulverized coal pipe 2, a cyclone combustion cylinder 3, a heat storage device I 4, a heat storage device II 5, a gasifying agent pipe 6, a temperature detector 7, a high-pressure blower 8, a gasifying agent nozzle 9, a gasifier 10, a gasifier grate 11, a coal bunker 12, a coal lock 13, an upper valve of the coal lock 14, a lower valve of the coal lock 15, a quench chamber 16, and a slag pool 17.

[0021] Pure oxygen is introduced into the pure oxygen pipe 1, carrying the pulverized coal from the pulverized coal pipe 2 into the cyclone combustion chamber 3 for combustion.

[0022] The outlet of the cyclone combustion cylinder 3 and the gasifying agent pipe 6 are both connected to heat storage device I4 and heat storage device II5. Heat storage device I4 is equipped with four valves, namely flue gas inlet valve 401, gasifying agent outlet valve 402, gasifying agent inlet valve 403 and flue gas outlet valve 404. Heat storage device II5 is also equipped with four valves, namely flue gas inlet valve 501, gasifying agent outlet valve 502, gasifying agent inlet valve 503 and flue gas outlet valve 504. Heat storage device I4 and heat storage device II5 work alternately. By alternately opening and closing the valves of the two heat storage devices, when one heat storage device stores heat, the other heat storage device releases heat. When the heat storage device I4 is storing heat, the flue gas inlet valve 401 and flue gas outlet valve 404 are opened, and the gasifying agent outlet valve 402 and gasifying agent inlet valve 403 are closed. High-temperature flue gas is used to store heat in the heat storage device I4. Simultaneously, the flue gas inlet valve 501 and flue gas outlet valve 504 are closed, and the gasifying agent outlet valve 502 and gasifying agent inlet valve 503 are opened, transferring heat from the heat storage device II5 to the gasifying agent. The outlet temperature of the gasifying agent is detected using a temperature sensor 7, and the outlet temperature of the gasifying agent is adjusted by controlling the opening of each valve. The gasifying agent in the gasifying agent pipe 6 can be one or more of carbon dioxide, oxygen, and water vapor in a mixture.

[0023] A high-pressure blower 8 is arranged after the temperature sensor 7. The outlet of the high-pressure blower 8 is connected to the gasifying agent nozzle 9 of the gasifier 10. The high-pressure blower 8 is used to increase the pressure of the gasifying agent to ensure that the pressure of the gasifying agent is greater than the pressure inside the gasifier 10.

[0024] The gasifier 10 is equipped with a gasifier grate 11 to support large coal particles inside the gasifier. The gasifier grate 11 has a multi-layer structure, with the outermost layer being a refractory material layer 101, the middle layer being a silicon carbide coating 102, the inner layer being a high-temperature alloy steel pipe 103, and the middle layer being a cooling water pipe 104, to prevent the gasifier grate 11 from being damaged at high temperatures.

[0025] A coal bunker 12 and a coal lock 13 are provided above the gasifier 10. An upper coal lock valve 14 and a lower coal lock valve 15 are respectively installed above and below the coal lock 13. Large coal particles are added to the gasifier 10 by intermittently opening and closing the upper and lower coal lock valves 14 and 15. During coal addition, the lower coal lock valve 15 is first closed, the upper coal lock valve 14 is opened, and coal is added to the coal lock 13. Then, the upper coal lock valve 14 is closed, and the lower coal lock valve 15 is gradually opened to add coal to the gasifier 10. Finally, the lower coal lock valve 15 is closed.

[0026] Below the gasifier 10, there is a quench chamber 16 and a slag pool 17. The liquid slag produced during the gasification process is cooled by the quench chamber 16 and then falls into the slag pool 17, and finally is discharged from the outlet below the slag pool 17.

[0027] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0028] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A pressurized gasification device employing heat storage and heating, comprising a pure oxygen pipe (1), a pulverized coal pipe (2), a cyclone combustor (3), a heat storage device I (4), a heat storage device II (5), a gasifying agent pipe (6), a temperature detector (7), a high-pressure blower (8), a gasifying agent nozzle (9), a gasifier (10), a gasifier grate (11), a coal bunker (12), a coal lock (13), an upper valve of the coal lock (14), a lower valve of the coal lock (15), a quench chamber (16), and a slag pool (17). Pure oxygen is introduced into the pure oxygen pipe (1) to carry the pulverized coal from the pulverized coal pipe (2) into the cyclone combustor (3) for combustion. The outlet of the cyclone combustor (3) and the gasifying agent pipe (6) are connected to the gasifier pipe (7). All are connected to heat storage device I (4) and heat storage device II (5). A temperature sensor (7) is installed after heat storage device I (4) and heat storage device II (5). A high-pressure blower (8) is arranged after the temperature sensor (7). The outlet of the high-pressure blower (8) is connected to the gasifying agent nozzle (9) of the gasifier (10). A gasifier grate (11) is arranged inside the gasifier (10). A coal bunker (12) and a coal lock (13) are arranged above the gasifier (10). A coal lock upper valve (14) and a coal lock lower valve (15) are arranged above and below the coal lock (13). A quench chamber (16) and a slag pool (17) are arranged below the gasifier (10).

2. The pressurized gasification device using heat storage and heating according to claim 1, characterized in that... The heat storage device I (4) is equipped with four valves, namely flue gas inlet valve (401), gasifying agent outlet valve (402), gasifying agent inlet valve (403) and flue gas outlet valve (404).

3. A pressurized gasification device employing heat storage and heating according to claim 1, characterized in that... The heat storage device II (5) is equipped with four valves, namely flue gas inlet valve (501), gasifying agent outlet valve (502), gasifying agent inlet valve (503) and flue gas outlet valve (504).

4. A pressurized gasification device employing heat storage and heating according to claim 1, characterized in that... The gasifier grate (11) has a multi-layer structure. The outermost layer is a refractory material layer (101), the middle layer is a silicon carbide coating (102), the inner layer is a high-temperature alloy steel pipe (103), and the middle layer is a cooling water pipe (104).

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