Coal supercritical water gasification system for hydrogen cogeneration

Abstract

The application discloses a coal supercritical water gasification system for realizing hydrogen cogeneration, and is characterized in that the product inlet of a hydrogen oxidation exothermic reactor is connected with a supercritical water gasification reactor and a storage tank; the oxidant inlet of the hydrogen oxidation exothermic reactor is connected with an oxidant storage tank; the coil outlet of the hydrogen oxidation exothermic reactor is connected with the residue inlet of a residue waste heat exchanger through an auxiliary heating system and the supercritical water gasification reactor; the product outlet of the oxidation exothermic reactor is sequentially connected with the inlet of a water tank through a heat absorber, the residue waste heat exchanger, a first heat exchanger, a second heat exchanger, a heat preservation water tank and a gas-liquid separator; and the outlet of the water tank is sequentially connected with the coil inlet of the oxidation exothermic reactor through the second heat exchanger and the first heat exchanger. The supercritical fluid after the gasification reaction and the residue are both utilized, and the coupling of the coal supercritical water gasification hydrogen production and the heating project is realized.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of coal supercritical water gasification, and particularly relates to a coal supercritical water gasification system for realizing hydrogen-heat cogeneration. BACKGROUND

[0002] At present, the main utilization mode of coal is direct combustion for thermal power generation, and the annual coal consumption for thermal power generation has exceeded 800 million tons. Coal combustion not only releases heat energy, but also produces SO x , NO x , and smoke and dust. The discharged SO x , NO x and water vapor form acid rain, causing losses in agriculture, forestry, and water industry, and corrosion of buildings. The dust after coal combustion is discharged through the chimney and floats in the atmosphere, forming fine particles, which is the main reason for the frequent urban haze. Haze not only affects the urban air quality and visibility, but also harms the health of the population. Therefore, how to reasonably utilize coal resources and develop advanced clean and efficient coal conversion technology is of great significance to the development of the energy field.

[0003] Supercritical water refers to water in a special state with both temperature and pressure higher than its critical point (T=374.15℃, P=22.12MPa). It has the properties of both liquid and gaseous water, and only a small amount of hydrogen bonds exist in this state, the dielectric constant is similar to that of non-polar organic solvents, and it has a high diffusion coefficient and low viscosity. Supercritical water gasification technology is a new type of gasification technology developed in recent years. This technology has the advantages of high gasification rate, high hydrogen content in gas products, and fast reaction rate when processing coal. N, S, ash, and other components in coal are mainly discharged in the form of slag, and there is no NO x , SO x , and smoke and dust in the gas products, which greatly reduces the pollution and damage to the environment. Oxygen, hydrogen, and other gases can be mixed with supercritical water in any proportion to form a single phase. In supercritical water, the hydrogen oxidation reaction is mild and controllable. The high-temperature and high-pressure supercritical fluid after supercritical water gasification can be used to heat the hot water required by the production user.

[0004] In addition, in the existing coal supercritical water gasification technology, the residue after supercritical water gasification still has a very high calorific value, but it is not reasonably utilized. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a coal supercritical water gasification system for realizing hydrogen-heat cogeneration, so as to solve the technical problems of environmental pollution caused by coal and the fact that the heat value of residues cannot be effectively utilized, realize clean utilization of coal and output of hydrogen energy and heat energy, reduce environmental pollution, and enhance utilization of residues after coal supercritical water gasification, thereby improving the comprehensive utilization efficiency of the system.

[0006] The present application adopts the following technical solutions:

[0007] The coal supercritical water gasification system for realizing hydrogen-heat cogeneration comprises a hydrogen oxidation exothermic reactor, a product inlet of the hydrogen oxidation exothermic reactor is connected to a supercritical water gasification reactor, and a storage tank; an oxidant inlet of the hydrogen oxidation exothermic reactor is connected to an oxidant storage tank; a coil outlet of the hydrogen oxidation exothermic reactor is connected to a residue inlet of a residue waste heat device through an auxiliary heating system and the supercritical water gasification reactor; a product outlet of the oxidation exothermic reactor is sequentially connected to an inlet of a water tank through a heat absorber, the residue waste heat device, a first heat exchanger, a second heat exchanger, a heat preservation water tank and a gas-liquid separator; and an outlet of the water tank is sequentially connected to a coil inlet of the oxidation exothermic reactor through the second heat exchanger and the first heat exchanger.

[0008] Specifically, a serpentine coil structure is arranged in the hydrogen oxidation exothermic reactor.

[0009] Specifically, the product inlet, the oxidant inlet and the coil outlet are arranged on the same side of the hydrogen oxidation exothermic reactor, and the product outlet and the coil inlet are arranged on the other side of the hydrogen oxidation exothermic reactor.

[0010] Further, the coil is outside a hydrogen oxidation exothermic reaction zone.

[0011] Specifically, the residue waste heat device comprises an inner layer and an outer layer, supercritical fluid discharged from the heat absorber enters the inner layer, high-temperature residues discharged from the supercritical water gasification reactor enter the outer layer, the supercritical fluid is discharged after being heated by the high-temperature residues, and the residues are discharged after absorbing heat.

[0012] Specifically, a mud pump is arranged between the supercritical water gasification reactor and the storage tank.

[0013] Specifically, a second high-pressure plunger pump is arranged between the oxidant storage tank and the hydrogen oxidation exothermic reactor.

[0014] Specifically, a water supply inlet of the heat absorber is in communication with a water supply outlet of the heat preservation water tank.

[0015] Specifically, a first high-pressure plunger pump is arranged between the water tank and the second heat exchanger.

[0016] Specifically, the hydrogen oxidation exothermic reactor and the supercritical water gasification reactor are respectively provided with an overpressure protection device and a temperature measuring thermocouple.

[0017] Compared with the prior art, the present application has at least the following beneficial effects:

[0018] A coal supercritical water gasification system for hydrogen cogeneration, water in the water tank is sent into the coil in the hydrogen oxidation exothermic reactor after being pressurized and heated, in the hydrogen oxidation exothermic reactor, the supercritical water entering the coil is further raised to 650-720 DEG C; the high-temperature supercritical water from the bottom enters the supercritical water reactor and reacts with coal particles to generate gas products; the gas products generated by the supercritical water gasification reaction and the supercritical water from the top of the reactor enter the hydrogen oxidation exothermic reactor, the hydrogen in the gas products reacts with the oxidant to generate heat, so that the supercritical water in the coil is heated; the high-temperature residue after the reaction in the supercritical water gasification reactor is discharged into the residue waste heat exchanger for heat recovery; the high-temperature supercritical fluid from the hydrogen oxidation exothermic reactor enters the heat recovery device to produce hot water required by the user, and the fluid output by the heat recovery device is heated again by the residue waste heat exchanger, then passes through the heat exchanger and the heat preservation water tank to recover heat and cool down, and then is separated into gas and liquid to obtain hydrogen-rich gas products. The method makes full use of the supercritical fluid and the residue after the gasification reaction, realizes the coupling of coal supercritical water gasification hydrogen production and heat supply project, and is an economical, effective and reasonable coal conversion method.

[0019] Further, the hydrogen oxidation exothermic reactor is arranged with a serpentine coil structure, which can strengthen the heat exchange effect between the supercritical water in the coil and the supercritical fluid outside the coil.

[0020] Further, the product inlet, the oxidant inlet and the coil outlet are arranged on the same side of the hydrogen oxidation exothermic reactor, and the product outlet and the coil inlet are arranged on the other side of the hydrogen oxidation exothermic reactor, so that the supercritical water in the coil and the supercritical fluid outside the coil are countercurrent heat exchange, and the heat exchange effect is enhanced.

[0021] Further, the residue waste heat exchanger comprises an inner layer and an outer layer, the supercritical fluid discharged from the heat absorber enters the inner layer, and the high-temperature residue discharged from the supercritical water gasification reactor enters the outer layer, the supercritical fluid with higher pressure is selected to flow through the inner layer of the residue waste heat exchanger, which is beneficial to reduce the use of materials of the residue waste heat exchanger and reduce the heat loss of the supercritical fluid.

[0022] Further, a slurry pump is arranged between the critical water gasification reactor and the storage tank for conveying the coal slurry in the storage tank.

[0023] Further, a second high-pressure plunger pump is arranged between the oxidant storage tank and the hydrogen oxidation exothermic reactor for conveying the oxidant.

[0024] Further, the water supply inlet of the heat absorber is communicated with the water supply outlet of the heat preservation water tank, and the heat preservation water tank provides warm water for the heat absorber to further heat the hot water required by the user.

[0025] Further, the hydrogen oxidation exothermic reactor and the supercritical water gasification reactor are respectively provided with overpressure protection devices and temperature measuring thermocouples, so that the overall safety of the system is effectively improved and the operation temperature of the system is controlled by the operating personnel.

[0026] In summary, the coal supercritical water gasification system is combined with the partial hydrogen oxidation exothermic reaction system, the hydrogen oxidation exothermic reaction provides the required heat for the coal supercritical gasification, the high-temperature supercritical fluid after the hydrogen oxidation exothermic reaction is used for heat supply, in addition, the high-temperature residue after the supercritical water gasification is effectively utilized, and the coupling of the coal supercritical water gasification hydrogen production and the heat supply system is realized.

[0027] The technical solutions of the embodiments of the present application will be further described in detail below with reference to the drawings and the embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 The process flow diagram of the coal supercritical water gasification system for realizing hydrogen heat cogeneration according to the present application.

[0029] 1. water tank, 2. first high-pressure plunger pump, 3. second regenerator, 4. first regenerator, 5. auxiliary heating system, 6. hydrogen oxidation exothermic reactor, 7. supercritical water gasification reactor, 8. residue waste heat boiler, 9. heat absorber, 10. heat preservation water tank, 11. gas-liquid separator, 12. storage tank, 13. slurry pump, 14. oxidant storage tank, and 15. second high-pressure plunger pump. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of, but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0031] In the description of the application, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "one side", "one end", "one edge" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" can be explicitly or implicitly included one or more. In the description of the application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0032] In the description of the application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0033] It should be understood that when used in the present specification and the appended claims, the terms "comprise" and "include" indicate the presence of described features, whole, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, whole, steps, operations, elements, components and / or sets thereof.

[0034] It should also be understood that the terms used in the present application are only for the purpose of describing specific embodiments and do not intend to limit the application. As used in the present application and the appended claims, unless the context clearly indicates otherwise, the singular form "a", "an" and "the" is intended to include the plural form.

[0035] It should be further understood that the term "and / or" used in the present application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0036] Various structural schematic diagrams according to the disclosed embodiments of the present application are shown in the drawings. These diagrams are not drawn to scale, in which certain details are exaggerated for clarity, and certain details may be omitted. The shapes of various regions, layers, and the relative sizes and positional relationships between them shown in the diagrams are merely exemplary, and may deviate in actuality due to manufacturing tolerances or technical limitations, and regions / layers with different shapes, sizes, and relative positions may be additionally designed according to actual needs by those skilled in the art.

[0037] The present application provides a coal supercritical water gasification system for hydrogen cogeneration, which couples the coal supercritical water gasification with partial hydrogen oxidation exothermic reaction by using the hydrogen-rich gas product after the supercritical gasification reaction of coal, and uses the hydrogen oxidation exothermic reaction to provide heat for the operation of the whole system; the high-temperature supercritical fluid output after the partial hydrogen oxidation exothermic reaction is used for heating, and the final gas product is separated to obtain the required hydrogen, which provides a high-efficiency and clean utilization way for the conversion of coal.

[0038] Referring to Figure 1 The present application provides a coal supercritical water gasification system for hydrogen cogeneration, which couples the coal supercritical water gasification with partial hydrogen oxidation exothermic reaction by using the hydrogen-rich gas product after the supercritical gasification reaction of coal, and uses the hydrogen oxidation exothermic reaction to provide heat for the operation of the whole system; the high-temperature supercritical fluid output after the partial hydrogen oxidation exothermic reaction is used for heating, and the final gas product is separated to obtain the required hydrogen, which provides a high-efficiency and clean utilization way for the conversion of coal.

[0039] The outlet of the storage tank 12 is communicated with the coal slurry inlet of the supercritical water gasification reactor 7 through the mud pump 13, and the product outlet of the supercritical water gasification reactor 7 is communicated with the product inlet of the hydrogen oxidation exothermic reactor 6; the coil outlet of the hydrogen oxidation exothermic reactor 6 is communicated with the supercritical water inlet of the supercritical water gasification reactor 7 through the auxiliary heating system 5, the supercritical water inlet is located at the bottom of the hydrogen oxidation exothermic reactor 6, the product outlet is located at the top of the hydrogen oxidation exothermic reactor 6, and the coal slurry inlet is located at one side of the upper part of the hydrogen oxidation exothermic reactor 6.

[0040] The outlet of the oxidant storage tank 14 is connected with the oxidant inlet of the hydrogen oxidation exothermic reactor 6 through the second high-pressure plunger pump 15.

[0041] The product outlet of the hydrogen oxidation exothermic reactor 6 is communicated with the inlet of the heat absorber 9, the outlet of the heat absorber 9 is communicated with the inner fluid inlet of the residue waste heat exchanger 8, the residue inlet of the residue waste heat exchanger 8 is communicated with the residue outlet of the supercritical water gasification reactor 7, the warm residue entering the outer layer of the residue waste heat exchanger 8 provides heat for the fluid in the inner layer, and the residue outlet is located at the side wall of the bottom of the hydrogen oxidation exothermic reactor 6.

[0042] The fluid outlet of the residue heat exchanger 8 is communicated with the hot end inlet of the first heat exchanger 4, the hot end outlet of the first heat exchanger 4 is communicated with the hot end inlet of the second heat exchanger 3, the hot end outlet of the second heat exchanger 3 is communicated with the inlet of the gas-liquid separator 11 through the heat preservation water tank 10, the liquid outlet of the gas-liquid separator 11 is connected with the water tank 1, the fluid output by the residue heat exchanger 8 is separated into gas and liquid in the gas-liquid separator 11 after recovering heat through the first heat exchanger 4, the second heat exchanger 3 and the heat preservation water tank 10, the hydrogen-rich gas product is collected as a chemical raw material or fuel for deep processing, and the liquid water is returned to the water tank 1.

[0043] The coil inlet of the oxidation exothermic reactor 6 is communicated with the outlet of the water tank 1 through the first heat exchanger 4, the second heat exchanger 3 and the first high-pressure piston pump 2 in sequence.

[0044] The hydrogen oxidation exothermic reactor 6 is arranged with a serpentine coil structure for strengthening the heat exchange between the supercritical water in the coil and the supercritical fluid outside the coil.

[0045] The product inlet, the oxidant inlet and the coil outlet of the hydrogen oxidation exothermic reactor 6 are on the same side of the hydrogen oxidation exothermic reactor 6, the product outlet and the coil inlet of the hydrogen oxidation exothermic reactor 6 are on the other side of the hydrogen oxidation exothermic reactor 6, and part of the hydrogen oxidation exothermic reaction is carried out in the hydrogen oxidation exothermic reaction zone outside the coil.

[0046] The residue heat exchanger 8 has a double-layer structure, the fluid enters the inner layer from the fluid inlet, the high-temperature residue enters the outer layer from the residue inlet, the fluid in the inner layer is heated by the high-temperature residue in the outer layer and then output from the fluid outlet, and the residue is directly discharged from the residue heat exchanger 8 after absorbing heat.

[0047] The hydrogen oxidation exothermic reactor 6 and the supercritical water gasification reactor 7 are both provided with overpressure protection devices.

[0048] The hydrogen oxidation exothermic reactor 6, the supercritical water gasification reactor 7 and the connecting pipelines are all provided with temperature measuring thermocouples.

[0049] The working principle of the coal supercritical water gasification system for realizing hydrogen cogeneration is as follows:

[0050] a. The water in the water tank is pressurized by the high-pressure piston pump and heated by the heat exchanger, and then sent into the coil in the hydrogen oxidation exothermic reactor, in the hydrogen oxidation exothermic reactor, part of the hydrogen oxidation reaction is exothermic outside the coil, so that the temperature of the supercritical water in the coil is increased;

[0051] b. The supercritical water at 650-720℃ flows out from the coil outlet, enters the supercritical water gasification reactor from the bottom, and reacts with coal to obtain gas products and residues, wherein the gas products and supercritical water enter the hydrogen oxidation exothermic reactor, the hydrogen in the gas products reacts with the oxidant to partially produce hydrogen oxidation exothermic reaction, and the residues after the supercritical water gasification of coal are discharged into the outer layer of the residue heat exchanger for energy recovery;

[0052] c. The high-temperature supercritical fluid after the hydrogen oxidation exothermic reaction enters the heat absorber to produce hot water required by users, and the fluid output from the heat absorber enters the inner layer of the residue heat exchanger from the fluid inlet, and in the residue heat exchanger, the fluid is heated and heated by the high-temperature residues to continue to recover heat;

[0053] d. The fluid output from the residue heat exchanger is separated into hydrogen-rich gas products and liquid water in the gas-liquid separator after heat recovery through the heat exchanger and the heat preservation tank.

[0054] The specific working process of the coal supercritical water gasification system for realizing hydrogen cogeneration is as follows:

[0055] In the system starting stage, the required heat of the system is provided by the auxiliary heating system 5, the water in the water tank 1 is pressurized to above the critical point of water by the high-pressure plunger pump 2, and then sequentially passes through the second heat exchanger 3, the first heat exchanger 4, the hydrogen oxidation exothermic reactor 6 and the auxiliary heating system 5 to enter the supercritical water gasification reactor 7, and by controlling the auxiliary heating system 5, the temperature of the supercritical water entering the supercritical water gasification reactor 7 reaches above 650℃.

[0056] After the coal is crushed, ground and sieved, coal powder below 200 mesh is obtained, catalyst and stabilizer are added to prepare coal slurry with a concentration of 30%-60%, and then the coal slurry is put into the coal slurry storage tank 12, and the coal slurry is transported to the supercritical water gasification reactor 7 by the mud pump 13, in the supercritical water gasification reactor 7, the coal powder is rapidly heated and supercritical water gasification reaction occurs to obtain hydrogen-rich gas products and residues.

[0057] The supercritical fluid including the gas products and supercritical water flows out from the top of the supercritical water gasification reactor 7, and then enters the hydrogen oxidation exothermic reactor 6, the high-temperature residues after the supercritical gasification reaction in the supercritical water gasification reactor 7 are periodically discharged into the outer layer of the residue heat exchanger 8 for energy recovery by the method of stepwise pressure reduction; the oxidant in the oxidant storage tank 14 is pressurized by the second high-pressure plunger pump 15 and enters the hydrogen oxidation exothermic reactor 6 from the oxidant inlet of the hydrogen oxidation exothermic reactor 6, and the oxidant is insufficient; in the hydrogen oxidation exothermic reaction zone outside the coil, the insufficient oxidant reacts with the hydrogen in the gas products to partially oxidize and release heat, so that the temperature in the hydrogen oxidation exothermic reactor 6 rises, and the supercritical water in the coil exchanges heat with the high-temperature fluid outside the coil, so that the temperature of the supercritical water in the coil rises.

[0058] The high-temperature fluid after the exothermic reaction of hydrogen oxidation flows out from the product outlet at the other end of the hydrogen oxidation exothermic reactor 6, enters the heat absorber 9 to produce hot water required by the user, the fluid output by the absorber 9 enters the inner layer of the residual heat exchanger 8, and the fluid entering the inner layer of the residual heat exchanger 8 is further recovered heat after being heated by the high-temperature residual layer of the outer layer, and the residual heat after the recovery of heat is discharged from the residual heat exchanger 8.

[0059] The fluid output by the residual heat exchanger 8 is recovered heat after passing through the first regenerator 4, the second regenerator 3 and the heat preservation water tank 10, and realizes gas-liquid separation in the gas-liquid separator 11, and the liquid water returns to the water tank 1.

[0060] During operation, due to the continuous hydrogen oxidation reaction in the hydrogen oxidation exothermic reactor 6, the temperature of the supercritical water in the coil gradually increases, that is, the temperature of the supercritical water entering the auxiliary heating system 5 continuously increases, at this time, the power of the auxiliary heating system 5 is gradually reduced until the auxiliary heating system 5 is finally closed, by adjusting the flow of coal slurry and the flow of supercritical water, the temperature of the coil outlet of the hydrogen oxidation exothermic reactor 6 reaches 650-720℃, and it can be considered that the entire system has realized self-heating, and the heat released by the hydrogen oxidation reaction can maintain the stable operation of the entire system without the need for external auxiliary heat source.

[0061] In the present application, the gas product, residual and high-temperature and high-pressure supercritical fluid after the coal supercritical water gasification are fully utilized, the hydrogen in the gas product provides the required heat for the coal supercritical water gasification through the exothermic reaction of partial hydrogen oxidation, the heat in the high-temperature residual after the coal supercritical water gasification is recovered and utilized, the high-temperature supercritical fluid after the exothermic reaction of hydrogen oxidation is used for heat supply according to the requirements, and the hydrogen-rich gas product is obtained.

[0062] In summary, the coal supercritical water gasification system for realizing hydrogen heat cogeneration combines the coal supercritical water gasification, the exothermic reaction of hydrogen oxidation and heat recovery and utilization, realizes the coupling of heat supply and hydrogen production by coal supercritical water gasification, is a high-efficiency and clean coal utilization technology, reduces environmental pollution, and achieves the dual purposes of hydrogen production and heat supply.

[0063] The above content only illustrates the technical idea of the present application, and cannot limit the protection scope of the present application, and any modification made according to the technical idea of the present application on the basis of the technical scheme falls within the protection scope of the claims of the present application.

Claims

1. A coal supercritical water gasification system for hydrogen cogeneration, characterized by, The hydrogen oxidation exothermic reactor (6) is connected with the storage tank (12) through the supercritical water gasification reactor (7) at a product inlet of the hydrogen oxidation exothermic reactor (6); the oxidant inlet of the hydrogen oxidation exothermic reactor (6) is connected with the oxidant storage tank (14); the coil outlet of the hydrogen oxidation exothermic reactor (6) is connected with the residue inlet of the residue heat exchanger (8) through the auxiliary heating system (5) and the supercritical water gasification reactor (7); the product outlet of the hydrogen oxidation exothermic reactor (6) is connected with the inlet of the water tank (1) through the heat absorber (9), the residue heat exchanger (8), the first heat exchanger (4), the second heat exchanger (3), the heat preservation water tank (10) and the gas-liquid separator (11) in sequence; the outlet of the water tank (1) is connected with the coil inlet of the hydrogen oxidation exothermic reactor (6) through the second heat exchanger (3) and the first heat exchanger (4) in sequence.

2. The coal supercritical water gasification system for hydrogen cogeneration according to claim 1, wherein The hydrogen oxidation exothermic reactor (6) is arranged with a serpentine coil structure.

3. The coal supercritical water gasification system for hydrogen cogeneration according to claim 1, wherein The product inlet, the oxidant inlet and the coil outlet are arranged on the same side of the hydrogen oxidation exothermic reactor (6), and the product outlet and the coil inlet are arranged on the other side of the hydrogen oxidation exothermic reactor (6).

4. The coal supercritical water gasification system for hydrogen cogeneration according to claim 3, wherein The coil is outside the hydrogen oxidation exothermic reaction zone.

5. The coal supercritical water gasification system for hydrogen cogeneration according to claim 1, wherein The residue heat exchanger (8) comprises an inner layer and an outer layer, the supercritical fluid discharged from the heat absorber (9) enters the inner layer, the high-temperature residue discharged from the supercritical water gasification reactor (7) enters the outer layer, the supercritical fluid is discharged after being heated by the high-temperature residue, and the residue is discharged after absorbing heat.

6. The coal supercritical water gasification system for hydrogen cogeneration according to claim 1, wherein The mud pump (13) is arranged between the supercritical water gasification reactor (7) and the storage tank (12).

7. The coal supercritical water gasification system for hydrogen cogeneration according to claim 1, wherein The second high-pressure plunger pump (15) is arranged between the oxidant storage tank (14) and the hydrogen oxidation exothermic reactor (6).

8. The coal supercritical water gasification system for hydrogen cogeneration according to claim 1, wherein The water supply inlet of the heat absorber (9) is communicated with the water supply outlet of the heat preservation water tank (10).

9. The coal supercritical water gasification system for hydrogen cogeneration according to claim 1, wherein The first high-pressure plunger pump (2) is arranged between the water tank (1) and the second heat exchanger (3).

10. The coal supercritical water gasification system for hydrogen cogeneration according to claim 1, wherein The hydrogen oxidation exothermic reactor (6) and the supercritical water gasification reactor (7) are respectively provided with overpressure protection devices and temperature measuring thermocouples.

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