A public water-coal slurry high-pressure feeding, distribution, transportation and pressure recovery system

Abstract

The present invention discloses a public water-coal slurry high-pressure feeding, distribution, transportation and pressure recovery system, which comprises a water-coal slurry stirring and storage unit. The water-coal slurry stirring and storage unit is sequentially connected to a low-pressure coal slurry transportation unit, a public water-coal slurry high-pressure feeding system unit and a supercritical water gasification reaction system. The supercritical water gasification reaction system is connected to the low-pressure coal slurry transportation unit via a high-pressure gas production recovery unit. Driven by the gas pressure in the high-pressure gas production recovery unit, the water-coal slurry in the water-coal slurry stirring and storage unit enters the public water-coal slurry high-pressure feeding system unit via the low-pressure coal slurry transportation unit. The water-coal slurry is distributed and pressurized by the public water-coal slurry high-pressure feeding system unit, and then sprayed into the supercritical water gasification reaction system to achieve complete gasification of the high-pressure water-coal slurry.

Description

Technical Field

[0001] The present invention belongs to the technical field of clean and efficient utilization of coal, and in particular relates to a public water-coal slurry high-pressure feeding, distribution, transportation and pressure recovery system. Background Art

[0002] Coal-water slurry is an important way to transport raw coal, especially in the coal chemical industry chain, and it plays a vital role. "Clean, efficient and low-carbon" is an inevitable requirement for coal energy utilization, and it is also a goal that various industries have been pursuing in recent years. Supercritical water gasification, as a new way of coal utilization, reconstructs the relationship between material and energy transformation in the process of fossil energy conversion, and transforms the traditional "burning with fire and water separation" model into a new model of "water-based, water and fire blending", realizing clean, low-carbon and efficient conversion of coal and minimizing negative environmental impact. In the process of supercritical water gasification of coal, coal is used as a material in the form of coal-water slurry and is transported to the supercritical water gasification reactor under high pressure conditions to complete the relevant reactions.

[0003] Although water-coal slurry is widely used in traditional gasification methods, its application conditions are far lower than the pressure required for supercritical water gasification. The high-temperature and high-pressure supercritical water gasification technology has higher requirements for the distribution and transportation of water-coal slurry. The existing technology process does not effectively connect the use of the high-pressure gas production pressure obtained by supercritical water gasification with the link that requires pressure drive to transport water-coal slurry. Therefore, under the premise of safety, it is the key content of the operation of this technology to recover the pressure of high-pressure gas production and utilize it in the water-coal slurry transportation link, and to enable the water-coal slurry transportation and feeding links to be converted and reasonably distributed under low-pressure and high-pressure conditions. The high-pressure and uninterrupted transportation of water-coal slurry has also become an important requirement for the large-scale industrial application of this technology. Recovering the pressure of the supercritical water gasification reaction system and realizing a water-coal slurry high-pressure feeding and distribution system is one of the key issues to reduce energy waste and is a necessary prerequisite for the commercial application of coal supercritical water gasification. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to address the deficiencies in the above-mentioned prior art and provide a public water-coal slurry high-pressure feeding, distribution, transportation and pressure recovery system, which is used to solve the technical problems of the switching process between the low-pressure filling and high-pressure transportation links of the water-coal slurry material in the supercritical water gasification system and the pressure recovery and utilization.

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

[0006] A public water-coal slurry high-pressure feeding, distribution, transportation and pressure recovery system comprises a water-coal slurry stirring and storage unit, which is sequentially connected to a low-pressure coal slurry transportation unit, a public water-coal slurry high-pressure feeding system unit and a supercritical water gasification reaction system, the supercritical water gasification reaction system being connected to the low-pressure coal slurry transportation unit via a high-pressure gas production recovery unit, the water-coal slurry in the water-coal slurry stirring and storage unit being driven by the gas pressure in the high-pressure gas production recovery unit, enters the public water-coal slurry high-pressure feeding system unit via the low-pressure coal slurry transportation unit, the water-coal slurry is distributed and pressurized by the public water-coal slurry high-pressure feeding system unit, and then is sprayed into the supercritical water gasification reaction system to achieve complete gasification of the high-pressure water-coal slurry.

[0007] Specifically, the water-coal slurry stirring and storing unit is provided with a stirring device capable of timing operation.

[0008] Specifically, the high-pressure gas production recovery unit is provided with a buffer tank, and the supercritical water gasification reaction system transports the obtained high-pressure CO2-rich gas product to the low-pressure coal slurry transport unit through the buffer tank, and the low-pressure water-coal slurry is transported by the high-pressure CO2-rich gas.

[0009] Specifically, the public water-coal slurry high-pressure feeding system unit includes a feeding unit, the input end of each group of feeding units is connected to the water-coal slurry distribution header through a water-coal slurry distribution control valve, and the output end of the feeding unit is connected to the supercritical water gasification reactor.

[0010] Furthermore, the feeding unit includes a feeder, and a low-pressure filling control valve is correspondingly provided on the connecting pipeline between the feeder and the water-coal slurry distribution control valve, and a feeder discharge control valve is provided on the connecting pipeline between the conventional feeder and the auxiliary feeder and the supercritical water gasification reactor; one end of the feeder is connected to the total boost control valve through the feeder boost control valve, and the other end is connected to the feeder pressure relief control valve.

[0011] Furthermore, the feeder includes a conventional feeder and an auxiliary feeder. The conventional feeder is connected to the supercritical water gasification reactor via a corresponding feeder discharge control valve and a conventional feeder cutting valve, and the auxiliary feeder is connected to the conventional feeder cutting valve via a corresponding feeder discharge control valve and an auxiliary feeder cutting control valve.

[0012] Furthermore, under the condition that the feeder discharge control valve and the corresponding feeder boost control valve corresponding to the conventional feeder are kept closed, the feeder pressure relief control valve corresponding to the conventional feeder is opened to reduce the pressure in the conventional feeder to a normal pressure state; the water-coal slurry distribution control valve and the low-pressure filling control valve of each group of feeding units are opened to allow the water-coal slurry in the water-coal slurry distribution manifold to be injected into the conventional feeder, completing the low-pressure filling replenishment of the conventional feeder when the system is running, and any water-coal slurry distribution control valves and the corresponding low-pressure filling control valves are closed;

[0013] Under the condition that the feeder discharge control valve corresponding to the conventional feeder is closed, the feeder boost control valve corresponding to the conventional feeder is opened to raise the internal pressure of the conventional feeder to the specified value; then the feeder discharge control valve, the auxiliary feeder cutting control valve and the feeder boost control valve corresponding to the auxiliary feeder are closed, and the feeder discharge control valve corresponding to the conventional feeder is opened, and the boost control valve of the conventional feeder is kept open, so that the water-coal slurry is supplied from the auxiliary feeder to the conventional feeder;

[0014] When it is necessary to replenish water-coal slurry, when the feeder discharge control valve and the corresponding feeder boost control valve corresponding to the auxiliary feeder are closed, open the feeder pressure relief control valve corresponding to the auxiliary feeder to reduce the pressure in the auxiliary feeder to normal pressure; open the water-coal slurry distribution control valve and the corresponding low-pressure filling control valve of the feeding unit to inject the water-coal slurry in the water-coal slurry distribution manifold into the auxiliary feeder, complete the low-pressure filling replenishment of the auxiliary feeder when the system is running, and then close all water-coal slurry distribution control valves and the corresponding low-pressure filling control valves;

[0015] When it is necessary to return the water-coal slurry in the conventional feeder and / or auxiliary feeder to the water-coal slurry distribution collection tank, close the total boost control valve and the feeder discharge control valve and feeder boost control valve corresponding to the conventional feeder and / or auxiliary feeder that needs to return the water-coal slurry, open the corresponding feeder pressure relief control valve to reduce the internal pressure of the feeder to normal pressure; then close the feeder pressure relief control valve, open the valve in the low-pressure filler control valve corresponding to the water-coal slurry distribution valve, and return the water-coal slurry inside the feeder to the water-coal slurry distribution collection tank, completing the recovery and recycling of the water-coal slurry.

[0016] Furthermore, a safety control valve is provided on the connecting pipeline between the conventional feeder and the conventional feeder cutting valve.

[0017] Furthermore, the feeding unit includes multiple groups, and the multiple groups of feeding units are arranged in parallel.

[0018] Specifically, a safety control unit is provided on the pipeline between the low-pressure coal slurry delivery unit and the public water-coal slurry high-pressure feeding system unit.

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

[0020] A public water-coal slurry high-pressure feeding, distribution, conveying and pressure recovery system, wherein the water-coal slurry stirring and storage unit stores prepared materials in a centralized manner and stirs the water-coal slurry to a uniformly mixed state; the pipeline in the low-pressure coal slurry conveying unit connects the various components in the system to ensure accurate conveying and distribution of the water-coal slurry; the safety control unit uses valves to ensure that the pressure during operation will not be too high to cause safety accidents; the public water-coal slurry high-pressure feeding system unit distributes the water-coal slurry to the feeder therein and completes the pressure increase of the material to meet the conditions for entering the reactor; the water-coal slurry in the supercritical water gasification reaction system can obtain product gas after reaction; the high-pressure gas product is stored in a buffer tank in the high-pressure gas production recovery unit, and the gas pressure can be effectively converted into energy to drive the low-pressure conveying flow of the coal slurry.

[0021] Furthermore, the stirring device is operated regularly to ensure uniform mixing of the coal particles.

[0022] Furthermore, by setting up a buffer tank of the recovery unit and connecting the buffer tank to the water-coal slurry conveying unit, the gas pressure is used to drive the flow of the water-coal slurry, so that the water-coal slurry can be effectively conveyed to the distribution header and feeder of the public feeding system under low pressure, thereby realizing the recovery of high-pressure gas produced after terminal separation of the supercritical water gasification system, reducing the power consumption required for water-coal slurry transportation, and avoiding energy waste.

[0023] Furthermore, in the public water-coal slurry high-pressure feeding system unit, the time difference between the high-pressure feeding time of the water-coal slurry and the low-pressure filling in the feeder can be used to realize cyclic filling under normal system operation, complete the conversion between the high-pressure and low-pressure states of the feeder, and enable the system to continuously feed at high pressure while performing low-pressure filling of the water-coal slurry on the auxiliary feeder to ensure continuous operation of the system; at the same time, the number of feeders can be reduced, thereby reducing system costs under continuous operation conditions.

[0024] Furthermore, the system pipelines use different low-pressure filling and high-pressure feeding water-coal slurry conveying pipe diameters. The time required for the feeder to complete the low-pressure filling process of the water-coal slurry is much lower than the water-coal slurry consumption process of the high-pressure feeding. The water-coal slurry distribution manifold can selectively deliver the water-coal slurry to each parallel group of feeders in batches by controlling the valve between the distribution manifold and the feeder group. Each feeder booster pipeline is equipped with a valve, which can individually control the opening and closing of the valve to control the pressure control of each water-coal slurry feeder.

[0025] Furthermore, the water-coal slurry high-pressure conveying pipelines of the auxiliary feeder and the conventional feeder are connected through valves, and the water-coal slurry is delivered to each nozzle connected to the conventional feeder in the low-pressure filling gap of the conventional feeder. A feed control valve is set in front of each nozzle pipeline to independently control the feeding requirements and operations of the nozzle at each position. The material in the feeder can be transported in reverse to the distribution storage area to realize the transfer of materials between different feeders.

[0026] Furthermore, by utilizing the combination of feeders, under the high-pressure feeding state of the normal operation of multiple parallel groups of feeders, the low-pressure water-coal slurry is injected into the auxiliary feeder. After the water-coal slurry in the operating high-pressure feeder is consumed to a lower level, the auxiliary feeder is switched to high-pressure feeding. The remaining feeders are completed with low-pressure filling during the high-pressure feeding time of the auxiliary feeder to replenish the water-coal slurry, and the auxiliary feeder is replaced after the pressure is increased. The auxiliary feeder can utilize the time difference of the high-pressure feeding of the conventional feeder to circulate the filling, completing the continuous high-pressure feeding during the operation process.

[0027] Furthermore, a safety control valve is provided between each feeder and the water-coal slurry nozzle to ensure that the pressure of the feeding device operates within a safe range, thereby ensuring the safety of the high-pressure feed distribution system.

[0028] Furthermore, multiple feeding units consisting of conventional feeders and auxiliary feeders can be connected in parallel to meet the combination of various water-coal slurry conditions with different volumes, and connected to the water-coal slurry distribution header through pipelines.

[0029] Furthermore, by setting a safety control unit in the pipeline, the system pressure is prevented from being too high, the safety of the transportation process is ensured and accidents are avoided.

[0030] In summary, the present invention utilizes the time difference between the high-pressure feeding time of the water-coal slurry and the low-pressure feeding time in the feeder to circulate the filling, thereby realizing continuous high-pressure feeding during the operation of the supercritical water gasification reaction system, ensuring the continuous operation of the system, and reducing the number of feeders to reduce costs.

[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 This is a flow chart of coal water slurry transportation in the present invention;

[0033] Figure 2 This is a schematic diagram of the public water-coal slurry high-pressure feeding system unit of the present invention.

[0034] Among them: 100. Water-coal slurry mixing and storage unit, 200. Low-pressure coal slurry conveying unit, 300. Safety control unit, 400. Public water-coal slurry high-pressure feeding system unit, 500. Supercritical water gasification reaction system, 600. High-pressure gas recovery unit; 1. Water-coal slurry distribution header; 2. Water-coal slurry distribution control valve; 3. Low-pressure filling control valve; 4. Feeder discharge control valve; 5. Conventional feeder; 6. Auxiliary feeder; 7. Auxiliary feeder cutting control valve; 8. Conventional feeder cutting control valve; 9. Total boost control valve; 10. Feeder boost control valve; 11. Feeder pressure relief control valve; 12. Safety control valve; 13. Supercritical water gasification reactor. DETAILED DESCRIPTION

[0035] 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.

[0036] 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," and "one side" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, in the description of the present invention, unless otherwise specified, "a plurality" means two or more.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] The accompanying drawings illustrate various schematic diagrams of the structures of the embodiments disclosed herein. These figures are not drawn to scale; for the purpose of 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.

[0042] The present invention provides a public water-coal slurry high-pressure feeding, distribution, conveying and pressure recovery system, which recovers the high-pressure gas produced at the final end of the supercritical water gasification technology, converts the pressure of the high-pressure gas into mechanical energy, and uses it in the water-coal slurry conveying link; adopts the public water-coal slurry high-pressure feeding, distribution and conveying operation method, utilizes the time difference between the high-pressure feeding time of the water-coal slurry and the low-pressure filling in the feeder to circulate the filling, and selectively conveys the water-coal slurry to different feeding systems, thereby ensuring the long-term continuous operation of the system.

[0043] See also Figure 1 The present invention provides a public water-coal slurry high-pressure feeding, distribution, transportation and pressure recovery system, comprising a water-coal slurry stirring and storage unit 100, a low-pressure coal slurry transportation unit 200, a safety control unit 300, a public water-coal slurry high-pressure feeding system unit 400, a supercritical water gasification reaction system 500, and a high-pressure gas production recovery unit 600. The water-coal slurry stirring and storage unit 100 is sequentially connected to the low-pressure coal slurry transportation unit 200, the safety control unit 300, the public water-coal slurry high-pressure feeding system unit 400, the supercritical water gasification reaction system 500, and the high-pressure gas production recovery unit 600. Gas recovery unit 600 and low-pressure coal slurry conveying unit 200; the water-coal slurry in the water-coal slurry mixing and storage unit 100 is driven by the gas pressure in the high-pressure gas production and recovery unit 600, enters the public water-coal slurry high-pressure feeding system unit 400 through the pipeline of the low-pressure coal slurry conveying unit 200 and the safety control unit 300, is distributed in the public water-coal slurry high-pressure feeding system unit 400 and the water-coal slurry is pressurized, and then sprayed into the supercritical water gasification reaction system 500, and the high-pressure water-coal slurry is completely gasified in the supercritical water gasification reaction system.

[0044] Among them, the coal slurry is stored in the water-coal slurry stirring and storage unit 100, and the stirring device in the water-coal slurry stirring and storage unit 100 is operated regularly to ensure uniform mixing of the coal particles; the coal slurry in the water-coal slurry stirring and storage unit 100 is transported to the public water-coal slurry high-pressure feeding system unit 400 through the pipeline of the low-pressure coal slurry conveying unit 200. The low-pressure water-coal slurry conveying in the entire process is driven by the recovered high-pressure gas, and the high-pressure CO2-rich gas product obtained from the terminal of the supercritical water gasification reaction system 500 is connected to the recovery buffer tank of the high-pressure gas recovery unit 600, and the pressure of the high-pressure gas is converted into mechanical energy to drive the flow of the coal slurry. The buffer tank in the high-pressure gas recovery unit 600 is connected to the pipeline of the low-pressure coal slurry conveying unit 200, and the coal slurry is driven to the public water-coal slurry high-pressure feeding system unit 400 under normal pressure, and then distributed and pressurized by the public water-coal slurry high-pressure feeding system unit 400, and sprayed into the supercritical water gasification reaction system 500.

[0045] The safety control unit 300 includes a safety valve and a pressure relief valve in the conveying pipeline. When the pressure is too high, the water-coal slurry in the pipe is discharged through the pressure relief valve, and the safety valve is used to ensure that the pressure does not exceed the safety limit, thereby preventing safety accidents caused by excessive pressure in the pipeline due to blockage and other reasons.

[0046] See also Figure 2 Taking a supercritical water gasification reactor with four nozzles as an example, the public water-coal slurry high-pressure feeding and distribution system 4 includes a water-coal slurry distribution header 1, two groups of feeding units and a total boost control valve 9.

[0047] The water-coal slurry distribution header 1 is connected to two groups of feeding units through pipelines via four water-coal slurry distribution control valves 2. Two groups of feeding units are used in parallel to transport the water-coal slurry. One group of feeding units is composed of four conventional feeders 5 and two auxiliary feeders 6. The conventional feeder 5 in each feeding unit is connected to the feeder discharge control valve 4 through a pipeline. The feeder discharge control valve 4 can control which feeder provides the water-coal slurry transportation.

[0048] The connecting pipeline of the conventional feeder 5 is connected to the supercritical water gasification reactor 13 through the conventional feeder cutting control valve 8, and the connecting pipeline of the auxiliary feeder 6 is connected to the conventional feeder cutting control valve 8 before entering the nozzle through the auxiliary feeder cutting control valve 7, so that the water-coal slurry from any feeder can be stably transported through the nozzle.

[0049] The total boost control valve 9 is connected to the boost control valve 10 of each feeder through a pipeline, which boosts the pressure of each feeder and maintains high pressure and stable delivery of water-coal slurry. The conventional feeder 5 and the auxiliary feeder 6 can achieve independent boosting and delivery.

[0050] Each feeding area is equipped with an independent feeder pressure relief control valve 11, which can reduce the internal pressure in the feeder in the high-pressure state until the conditions for low-pressure feeding are met, and the material in the water-coal slurry distribution tank 1 is transported to each feeder as needed through the water-coal slurry distribution control valve 2.

[0051] The safety control valve 12 is connected between the feeder discharge control valve 4 and the conventional feeder cutting valve 8 of each feeder to ensure the safe operation of the system.

[0052] The operation method of the public water-coal slurry high-pressure feeding and distribution system is as follows:

[0053] Before the operation of the water-coal slurry high-pressure feeding and distribution system, the internal pressure of each feeder is normal pressure and there is no water-coal slurry remaining inside. Taking the two groups of feeding units in parallel operation as an example, open the water-coal slurry distribution control valve 2, open the low-pressure filling control valve 3, close the feeder discharge control valve 4 of each feeder, close the total boost control valve 9, feeder boost control valve 10 and feeder pressure relief control valve 11 that control the feeder pressure increase and pressure relief, and the water-coal slurry is sent to the conventional feeder 5 and auxiliary feeder 6 of the two groups of feeding units through the water-coal slurry distribution header 1 and the low-pressure filling control valve 3. After the water-coal slurry fills the feeder, close all the water-coal slurry distribution control valves 2 and the low-pressure filling control valve 3.

[0054] After the supercritical water gasification reactor reaches the rated temperature and pressure and the water-coal slurry needs to be sprayed into the reactor through the nozzle, the feeder discharge control valve 4 of all feeders is closed, the total boost control valve 9 and all feeder boost control valves 10 are opened, and the feeder pressure relief control valve 11 is kept closed. After the internal pressure of each feeder reaches the specified value, the feeder boost control valve 10 corresponding to the auxiliary feeder 6 is closed, the feeder discharge control valve 4 of the conventional feeder 5 of each group of feeding units is opened, and the conventional feeder cutting valve 8 is opened, and the feeder discharge control valve 4 and the auxiliary feeder cutting control valve 7 corresponding to the auxiliary feeder 6 are kept closed, so that the water-coal slurry in the conventional feeder is transported to each nozzle of the reactor under high pressure.

[0055] As the reaction progresses, the water-coal slurry in the conventional feeder 5 is consumed. The time difference between the high-pressure feeding time and the low-pressure feeding time of the water-coal slurry in the feeder needs to be used to circulate the feeding. When the water-coal slurry in the conventional feeder needs to be replenished, the feeder discharge control valve 4 corresponding to the conventional feeder 5 of each feeding unit is closed, and the feeder discharge control valve 4 and the auxiliary feeder cutting control valve 7 corresponding to the auxiliary feeder 6 are opened, so that the high-pressure water-coal slurry in the auxiliary feeder passes through the conventional feeder cutting valve 8 and is delivered to the nozzle, maintaining the continuous operation of the delivery system.

[0056] At the same time, under the condition that the feeder discharge control valve 4 and the corresponding feeder boost control valve 10 corresponding to the conventional feeder are kept closed, the feeder pressure relief control valve 11 corresponding to the conventional feeder 5 is opened to reduce the pressure in the conventional feeder to normal pressure. The water-coal slurry distribution control valve 2 and the low-pressure filling control valve 3 of each group of feeding units are opened to allow the water-coal slurry in the water-coal slurry distribution manifold 1 to be injected into the conventional feeder 5, completing the low-pressure filling replenishment of the conventional feeder during system operation. After that, all water-coal slurry distribution control valves 2 and the corresponding low-pressure filling control valves 3 are closed; under the condition that the feeder discharge control valve 4 corresponding to the conventional feeder is closed, the feeder boost control valve 10 corresponding to the conventional feeder 5 is opened to raise the internal pressure of the conventional feeder to the specified value. Then close the feeder discharge control valve 4, the auxiliary feeder cutting control valve 7 and the feeder boost control valve 10 corresponding to the auxiliary feeder 6, open the feeder discharge control valve 4 corresponding to the conventional feeder 5, and keep the conventional feeder boost control valve 10 open, so that the water-coal slurry is converted from being supplied by the auxiliary feeder to being supplied by the conventional feeder.

[0057] When the water-coal slurry in the auxiliary feeder needs to be replenished during the operation of the conventional feeder, when the feeder discharge control valve 4 and the corresponding boost control valve corresponding to the auxiliary feeder 6 are closed, the feeder pressure relief control valve 11 corresponding to the auxiliary feeder 6 is opened to reduce the pressure in the auxiliary feeder to normal pressure. The water-coal slurry distribution control valve 2 and the corresponding low-pressure filling control valve 3 of each group of feeding units are opened to allow the water-coal slurry in the water-coal slurry distribution manifold 1 to be injected into the auxiliary feeder 6, completing the low-pressure filling replenishment of the auxiliary feeder during the operation of the system. After that, all water-coal slurry distribution control valves 2 and the corresponding low-pressure filling control valves 3 are closed. At this point, the water-coal slurry replenishment in the conventional feeder 5 and the auxiliary feeder 6 is realized under the continuous and high-pressure operation of the feeding system, and the circulating filling of the two is realized, maintaining the continuous and stable operation of the system.

[0058] When it is necessary to return the water-coal slurry in the conventional feeder 5 and / or the auxiliary feeder 6 to the water-coal slurry distribution collection tank 1, close the total boost control valve 9 and the feeder discharge control valve 4 and the feeder boost control valve 10 corresponding to the and / or auxiliary feeder 6 to which the water-coal slurry needs to be returned, open the corresponding feeder pressure relief control valve 11 to reduce the internal pressure of the feeder to normal pressure, then close the feeder pressure relief control valve 11, open the valve in the low-pressure filling control valve 3 corresponding to the water-coal slurry distribution valve 2, and return the water-coal slurry inside the feeder to the water-coal slurry distribution collection tank 1, completing the recovery and recycling of the water-coal slurry.

[0059] In summary, the present invention provides a public water-coal slurry high-pressure feeding, distribution, transportation and pressure recovery system, which effectively utilizes the pressure of the high-pressure gas production obtained at the terminal of the supercritical water gasification reaction system to drive the low-pressure transportation of the water-coal slurry and reduce energy consumption; wherein, the public water-coal slurry high-pressure feeding system mainly includes a water-coal slurry distribution control unit, a water-coal slurry feeder, a distribution and feeding control valve, a feed control valve, a safety control valve, a discharge and cutting control valve, and a boost control valve, and the distribution system connects each unit through a conveying pipeline. The present invention utilizes the time difference between the high-pressure feeding time of the water-coal slurry and the low-pressure filling in the feeder to circulate the filling, thereby realizing continuous high-pressure feeding during the operation of the supercritical water gasification reaction system, ensuring the continuous operation of the system, and can reduce the number of feeders and reduce costs.

[0060] 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 public water-coal slurry high-pressure feeding, distribution, transportation and pressure recovery system, characterized in that: The invention comprises a water-coal slurry stirring and storage unit (100), which is sequentially connected to a low-pressure coal slurry conveying unit (200), a public water-coal slurry high-pressure feeding system unit (400) and a supercritical water gasification reaction system (500). The supercritical water gasification reaction system (500) is connected to the low-pressure coal slurry conveying unit (200) via a high-pressure gas production recovery unit (600). The water-coal slurry in the water-coal slurry stirring and storage unit (100) enters the public water-coal slurry high-pressure feeding system unit (400) via the low-pressure coal slurry conveying unit (200) under the drive of the gas pressure in the high-pressure gas production recovery unit (600). The water-coal slurry is distributed and pressurized by the public water-coal slurry high-pressure feeding system unit (400), and then sprayed into the supercritical water gasification reaction system (500), thereby achieving complete gasification of the high-pressure water-coal slurry.

2. The public water-coal slurry high-pressure feeding, distribution, transportation and pressure recovery system according to claim 1 is characterized in that: The water-coal slurry stirring and storage unit (100) is provided with a stirring device capable of timing operation.

3. The public water-coal slurry high-pressure feeding, distribution, transportation and pressure recovery system according to claim 1 is characterized in that: The high-pressure gas production recovery unit (600) is provided with a buffer tank, and the supercritical water gasification reaction system (500) transports the obtained high-pressure CO2-rich gas product to the low-pressure coal slurry transport unit (200) through the buffer tank, and the low-pressure water-coal slurry is transported by driving the high-pressure CO2-rich gas.

4. The public water-coal slurry high-pressure feeding, distribution, transportation and pressure recovery system according to claim 1 is characterized in that: The public water-coal slurry high-pressure feeding system unit (400) comprises feeding units, wherein the input end of each group of feeding units is connected to the water-coal slurry distribution header (1) via a water-coal slurry distribution control valve (2), and the output end of the feeding unit is connected to a supercritical water gasification reactor (13).

5. The public water-coal slurry high-pressure feeding, distribution, transportation and pressure recovery system according to claim 4 is characterized in that: The feeding unit comprises a feeder, a low-pressure filler control valve (3) is correspondingly provided on the connecting pipeline between the feeder and the water-coal slurry distribution control valve (2), and a feeder discharge control valve (4) is provided on the connecting pipeline between the conventional feeder (5) and the auxiliary feeder (6) and the supercritical water gasification reactor (13); one end of the feeder is connected to the total boost control valve (9) via the feeder boost control valve (10), and the other end is connected to the feeder pressure relief control valve (11).

6. The public water-coal slurry high-pressure feeding, distribution, transportation and pressure recovery system according to claim 5 is characterized in that: The feeder comprises a conventional feeder (5) and an auxiliary feeder (6); the conventional feeder (5) is connected to the supercritical water gasification reactor (13) via a corresponding feeder discharge control valve (4) and a conventional feeder cutting valve (8); and the auxiliary feeder (6) is connected to the conventional feeder cutting valve (8) via a corresponding feeder discharge control valve (4) and an auxiliary feeder cutting control valve (7).

7. The public water-coal slurry high-pressure feeding, distribution, transportation and pressure recovery system according to claim 6 is characterized in that: Under the condition that the feeder discharge control valve (4) and the corresponding feeder boost control valve (10) corresponding to the conventional feeder (5) are kept closed, the feeder pressure relief control valve (11) corresponding to the conventional feeder (5) is opened to reduce the pressure in the conventional feeder to a normal pressure state; the water-coal slurry distribution control valve (2) and the low-pressure filling control valve (3) of each group of feeding units are opened to allow the water-coal slurry in the water-coal slurry distribution header (1) to be injected into the conventional feeder (5), completing the low-pressure filling replenishment of the conventional feeder (5) when the system is running, and closing all the water-coal slurry distribution control valves (2) and the corresponding low-pressure filling control valves (3); Under the condition that the feeder discharge control valve (4) corresponding to the conventional feeder is closed, the feeder pressure-increasing control valve (10) corresponding to the conventional feeder (5) is opened to increase the internal pressure of the conventional feeder to a specified value; then, the feeder discharge control valve (4), the auxiliary feeder cutting control valve (7) and the feeder pressure-increasing control valve (10) corresponding to the auxiliary feeder (6) are closed, and the feeder discharge control valve (4) corresponding to the conventional feeder (5) is opened, and the pressure-increasing control valve (10) of the conventional feeder is kept open, so that the water-coal slurry is supplied from the auxiliary feeder to the conventional feeder; When it is necessary to replenish the water-coal slurry, when the feeder discharge control valve (4) and the corresponding feeder boost control valve (10) corresponding to the auxiliary feeder (6) are closed, the feeder pressure relief control valve (11) corresponding to the auxiliary feeder (6) is opened to reduce the pressure in the auxiliary feeder (6) to a normal pressure state; the water-coal slurry distribution control valve (2) and the corresponding low-pressure filling control valve (3) of the feeding unit are opened to allow the water-coal slurry in the water-coal slurry distribution header (1) to be injected into the auxiliary feeder (6), completing the low-pressure filling replenishment of the auxiliary feeder (6) when the system is running, and then closing all the water-coal slurry distribution control valves (2) and the corresponding low-pressure filling control valves (3); When the water-coal slurry in the conventional feeder (5) and / or the auxiliary feeder (6) needs to be fed back to the water-coal slurry distribution header (1), the total boost control valve (9) and the feeder discharge control valve (4) and the feeder boost control valve (10) corresponding to the conventional feeder (5) and / or the auxiliary feeder (6) to which the water-coal slurry needs to be fed back are closed, and the corresponding feeder pressure relief control valve (11) is opened to reduce the pressure inside the feeder to normal pressure; then the feeder pressure relief control valve (11) is closed, and the valve in the low-pressure filling control valve (3) corresponding to the water-coal slurry distribution control valve (2) is opened to feed the water-coal slurry inside the feeder back to the water-coal slurry distribution header (1), thereby completing the recovery and recycling of the water-coal slurry.

8. The public water-coal slurry high-pressure feeding, distribution, transportation and pressure recovery system according to claim 5 is characterized in that: A safety control valve (12) is provided on the connecting pipeline between the conventional feeder (5) and the conventional feeder cutting valve (8).

9. The public water-coal slurry high-pressure feeding, distribution, transportation and pressure recovery system according to any one of claims 4 to 8, characterized in that: The feeding units include multiple groups, and the multiple groups of feeding units are arranged in parallel.

10. The public water-coal slurry high-pressure feeding, distribution, transportation and pressure recovery system according to claim 1, characterized in that: A safety control unit (300) is provided on the pipeline between the low-pressure coal slurry delivery unit (200) and the public water-coal slurry high-pressure feeding system unit (400).

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