A system for co-production of steam and nitrogen from catalytic combustion of hydrogen

Abstract

The utility model provides a kind of hydrogen catalytic combustion co-production steam and nitrogen's system, the system includes gas mixer, reactor, steam generator, gas-gas heat exchanger, gas-water heat exchanger, gas-water separator and feed pump, with simple process, device cost low advantage, and co-production water vapor and nitrogen are realized;Combining PLC control device, the operation automation and running state remote monitoring of device are realized;The hydrogen catalytic combustion co-production steam and nitrogen's system of the utility model is designed and built using modularization, integration mode, convenient transportation, movement and expansion, there is with industrial application and market promotion.

Description

Technical Field

[0001] This utility model relates to the field of hydrogen catalytic combustion technology, and in particular to a system for the co-production of steam and nitrogen by hydrogen catalytic combustion. Background Technology

[0002] Currently, research in the field of hydrogen catalytic combustion technology is in the laboratory, small-scale, and civilian heating stages. The difficulty in industrialization and large-scale application lies in the fact that hydrogen is flammable and explosive, with a wide range of explosive limits in air (approximately 4% to 75% by volume). Therefore, for safety, the hydrogen concentration must be controlled below the lower explosive limit during the reaction of hydrogen with air. This means that multiple series reactions are required to fully utilize hydrogen and oxygen in the air. CN119309197A discloses a multi-stage air-intake hydrogen catalytic combustion system and method. The system includes a hydrogen supply component and an air supply component. The air supply component and the hydrogen supply component are connected in parallel and then connected to a hydrogen catalytic combustion reactor through a mixing pipe. The hydrogen catalytic combustion reactor includes multiple catalytic reaction chambers distributed sequentially from the beginning to the end. Each catalytic reaction chamber is connected to a branch air supply component, which is also connected to the hydrogen supply component through a branch pipe. The air intake of each branch air supply component is adjustable. This patent improves the useful power consumption ratio of the air supply component by using multi-stage mixed hydrogen intake.

[0003] While the multi-stage series reactor multi-point feeding process can make full use of oxygen in the air, it requires each reactor to be equipped with a detection instrument, resulting in a complex process, many instruments, large equipment, high investment, and high failure rate. In addition, the water produced by the reaction must be separated in time, otherwise it will reduce the performance of the catalyst. At the same time, the exhaust gas produced by the catalytic combustion device is generally directly released into the air without being utilized.

[0004] Therefore, there is an urgent need to develop a new hydrogen catalytic combustion system to simplify equipment, reduce costs, and fully recycle and utilize resources. Utility Model Content

[0005] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a system for the co-production of steam and nitrogen by hydrogen catalytic combustion, in order to solve the problems of large equipment, high investment and inability to co-produce nitrogen in the prior art hydrogen catalytic combustion system.

[0006] To achieve the above and other related objectives, this utility model provides a system for the co-production of steam and nitrogen by hydrogen catalytic combustion, the system comprising a gas mixer, a reactor, a steam generator, a gas-to-gas heat exchanger, a gas-to-water heat exchanger, a gas-to-water separator, and a feed water pump;

[0007] The gas mixer is provided with a rupture disc interface at the top, and a hydrogen inlet, an air inlet and a first inlet for circulating gas are provided on the top side. The bottom of the gas mixer is connected to the upper part of the reactor.

[0008] The bottom of the reactor is connected to the top of the gas-to-gas heat exchanger. The reactor is located inside the steam generator, and the reactor and the steam generator form a shell-and-tube structure. The inner diameter of the upper half of the steam generator is larger than that of the lower half. The upper half of the steam generator is equipped with a first level gauge and a steam outlet. The lower half of the steam generator is equipped with a second level gauge and a first water inlet. The upper part of the steam generator is connected to the gas mixer, and the lower part of the steam generator is connected to the gas-to-gas heat exchanger.

[0009] The lower part of the gas-gas heat exchanger is provided with a second circulating gas inlet, the upper part of the gas-gas heat exchanger is provided with a second circulating gas outlet, the second circulating gas outlet is connected to the first circulating gas inlet through a pipeline, and the bottom of the gas-gas heat exchanger is connected to the top of the gas-water heat exchanger.

[0010] The gas-water heat exchanger is provided with a second water inlet at the bottom and a second water outlet at the top. The second water outlet is connected to the first water inlet through a pipeline. The bottom of the gas-water heat exchanger is connected to the top of the gas-water separator.

[0011] The gas-water separator is provided with a first outlet for circulating gas at the top, which is connected to a second inlet for circulating gas through a pipeline. The pipeline connecting the first outlet for circulating gas and the second inlet for circulating gas is also provided with a tail gas discharge port. The gas-water separator is provided with a first outlet for water at the bottom, which is connected to a second inlet for water through a pipeline.

[0012] The water supply pump is connected to the soft water inlet pipeline and the second water inlet, and is suitable for replenishing water to the system.

[0013] Preferably, the system further includes a PLC control device, and the hydrogen inlet, air inlet, first circulating gas inlet, first circulating gas outlet, second circulating gas inlet, second circulating gas outlet, steam outlet, first water outlet, second water inlet, second water outlet, first water inlet, exhaust gas outlet, and water pump outlet are all equipped with control valves, which are respectively connected to the PLC control device.

[0014] Preferably, the pipeline connecting the first outlet of the circulating gas and the second inlet of the circulating gas is equipped with a gas circulator, and the exhaust gas outlet is located on the outlet pipeline of the gas circulator.

[0015] Preferably, the gas mixer is a static mixer or a wire mesh mixer.

[0016] Preferably, the reactor is a vertical tubular reactor; the interior of the reactor is filled with a granular catalyst, or the inner surface of the reactor is coated with a powdered catalyst.

[0017] Preferably, the first level gauge is a magnetostrictive level gauge or a differential pressure transmitter; the second level gauge is a magnetostrictive level gauge or a differential pressure transmitter; the first level gauge and the second level gauge are different.

[0018] Preferably, the gas-to-gas heat exchanger is a corrugated plate heat exchanger, a finned heat exchanger, or a shell-and-tube heat exchanger.

[0019] Preferably, the gas-water heat exchanger is a corrugated plate heat exchanger, a finned heat exchanger, or a shell-and-tube heat exchanger.

[0020] Preferably, the gas-water separator is a wire mesh type, a grid type, a louver type, or a vortex type.

[0021] Preferably, the water supply pump is a centrifugal pump, a vortex pump, a multistage pump, or a positive displacement pump.

[0022] As described above, the hydrogen catalytic combustion system of this invention for co-producing steam and nitrogen has the following beneficial effects:

[0023] This invention relates to a system for the co-production of steam and nitrogen by hydrogen catalytic combustion, comprising a gas mixer, a reactor, a steam generator, a gas-to-gas heat exchanger, a gas-to-water heat exchanger, a gas-to-water separator, and a feed water pump. It features a simple process and low equipment cost, and achieves the co-production of steam and nitrogen. Furthermore, by integrating a PLC control device, it enables automated operation and remote monitoring of the system's running status. This invention's system for the co-production of steam and nitrogen by hydrogen catalytic combustion is designed and constructed using a modular and integrated approach, facilitating transportation, relocation, and expansion, and is beneficial for industrial applications and market promotion. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the system for the co-production of steam and nitrogen by hydrogen catalytic combustion according to this invention.

[0025] Explanation of icon numbers

[0026] 1 Gas mixer

[0027] 2 Reactor

[0028] 3 Steam generator

[0029] 4. Gas-to-gas heat exchanger

[0030] 5. Gas-water heat exchanger

[0031] 6. Gas-water separator

[0032] 7. Gas Circulator

[0033] 8. Water supply pump

[0034] 11. Rupture disc interface

[0035] 12 Hydrogen inlet

[0036] 13 Air inlet

[0037] 14 Soft water inlet pipeline

[0038] L1 First Liquid Level Gauge

[0039] L2 Second Liquid Level Gauge

[0040] X1 First feed inlet of circulating gas

[0041] X2 Circulating gas first outlet

[0042] X3 Circulating gas second inlet

[0043] X4 Circulating gas second outlet

[0044] W1 First Outlet

[0045] W2 Second Inlet

[0046] W3 Second Outlet

[0047] W4 First Inlet

[0048] S1 Steam Outlet

[0049] VT exhaust outlet Detailed Implementation

[0050] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model.

[0051] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0052] In this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature. Terms such as "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description. They 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, and therefore should not be construed as a limitation of this invention.

[0053] Please refer to the accompanying drawings. It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of this utility model. Therefore, the drawings only show the components related to this utility model and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0054] This utility model provides a system for the co-production of steam and nitrogen by hydrogen catalytic combustion. The system includes a gas mixer 1, a reactor 2, a steam generator 3, a gas-to-gas heat exchanger 4, a gas-to-water heat exchanger 5, a gas-to-water separator 6, and a water pump 8.

[0055] The gas mixer 1 is provided with a rupture disc interface 11 at the top, and a hydrogen inlet 12, an air inlet 13 and a first circulating gas inlet X1 are also provided on the top side. The bottom of the gas mixer 1 is connected to the upper part of the reactor 2.

[0056] The bottom of the reactor 2 is connected to the top of the gas-to-gas heat exchanger 4. The reactor 2 is located inside the steam generator 3, and the reactor 2 and the steam generator 3 form a shell-and-tube structure. The inner diameter of the upper half of the steam generator 3 is larger than that of the lower half. The upper half of the steam generator 3 is provided with a first level gauge L1 and a steam outlet S1. The lower half of the steam generator 3 is provided with a second level gauge L2 and a first water inlet W4. The upper part of the steam generator 3 is connected to the gas mixer 1, and the lower part of the steam generator 3 is connected to the gas-to-gas heat exchanger 4.

[0057] The lower part of the gas-gas heat exchanger 4 is provided with a second circulating gas inlet X3, the upper part of the gas-gas heat exchanger 4 is provided with a second circulating gas outlet X4, the second circulating gas outlet X4 is connected to the first circulating gas inlet X1 through a pipeline, and the bottom of the gas-gas heat exchanger 4 is connected to the top of the gas-water heat exchanger 5.

[0058] The gas-water heat exchanger 5 is provided with a second water inlet W2 at the bottom and a second water outlet W3 at the top. The second water outlet W3 is connected to the first water inlet W4 through a pipeline. The bottom of the gas-water heat exchanger 5 is connected to the top of the gas-water separator 6.

[0059] The gas-water separator 6 is provided with a first circulating gas outlet X2 at its upper part. The first circulating gas outlet X2 is connected to the second circulating gas inlet X3 through a pipeline. The pipeline connecting the first circulating gas outlet X2 and the second circulating gas inlet X3 is also provided with a tail gas discharge outlet VT. The bottom of the gas-water separator 6 is provided with a first water outlet W1. The first water outlet W1 is connected to the second water inlet W2 through a pipeline.

[0060] The water supply pump 8 is connected to the soft water inlet pipe 14 and the second water inlet W2, and is suitable for replenishing water to the system.

[0061] In a preferred embodiment, the hydrogen catalytic combustion system for co-producing steam and nitrogen shown in this utility model embodiment further includes a PLC control device. The hydrogen inlet 12, air inlet 13, first circulating gas inlet X1, first circulating gas outlet X2, second circulating gas inlet X3, second circulating gas outlet X4, steam outlet S1, first water outlet W1, second water inlet W2, second water outlet W3, first water inlet W4, exhaust gas outlet VT, and the outlet of the water pump 8 are all equipped with control valves, which are respectively connected to the PLC control device.

[0062] In a more preferred embodiment, the gas mixer 1 is further equipped with a hydrogen concentration detector; the reactor 2 is further equipped with a first temperature instrument, a first pressure instrument, and a bed pressure drop detection instrument; the steam generator 3 is further equipped with a second temperature instrument and a second pressure instrument; the gas-gas heat exchanger 4 is further equipped with a first reaction gas inlet / outlet temperature detection instrument and a circulating gas inlet / outlet temperature detection instrument; the gas-water heat exchanger 5 is further equipped with a second reaction gas inlet / outlet temperature detection instrument and a water inlet / outlet temperature detection instrument; and the gas-water separator 6 is further equipped with a third temperature instrument and a humidity detection instrument. The hydrogen concentration detector, the first temperature instrument, the first pressure instrument, the bed pressure drop detection instrument, the second temperature instrument, the second pressure instrument, the first reaction gas inlet / outlet temperature detection instrument, the circulating gas inlet / outlet temperature detection instrument, the second reaction gas inlet / outlet temperature detection instrument, the water inlet / outlet temperature detection instrument, the third temperature instrument, the humidity detection instrument, the first level gauge L1, and the second level gauge L2 are respectively connected to a PLC control device.

[0063] In a preferred embodiment, such as Figure 1 As shown in the embodiment of this utility model, in the system for co-producing steam and nitrogen by hydrogen catalytic combustion, a gas circulator 7 is provided in the pipeline connecting the first outlet X2 of the circulating gas and the second inlet X3 of the circulating gas, and the exhaust gas outlet VT is provided in the outlet pipeline of the gas circulator 7.

[0064] In a preferred embodiment, such as Figure 1 As shown in the embodiment of this utility model, in the system for co-producing steam and nitrogen by hydrogen catalytic combustion, the gas circulation machine 7 is a fan, compressor, or booster pump. The gas circulation machine 7 can also be any other type of device with gas pressurization function.

[0065] In this embodiment, the gas circulator 7 circulates the reaction gas back to the reactor 1, and the oxygen content of the gas outlet of the reactor 1 is controlled to meet the process requirements by controlling the circulation ratio.

[0066] In a preferred embodiment, such as Figure 1 As shown in the embodiment of this utility model, in the system for co-producing steam and nitrogen by hydrogen catalytic combustion, the gas mixer 1 is a static mixer or a wire mesh mixer.

[0067] In this embodiment, the gas mixer 1 mixes the newly added hydrogen, air and circulating gas evenly to avoid local hydrogen concentration exceeding the lower explosive limit and increasing safety risks. In addition, even mixing is conducive to full contact between hydrogen and oxygen, resulting in more complete combustion.

[0068] In a preferred embodiment, such as Figure 1As shown in the embodiment of this utility model, in the system for the co-production of steam and nitrogen by hydrogen catalytic combustion, the reactor 2 is a vertical tubular reactor; the interior of the reactor 2 is filled with a particulate catalyst, or the inner surface of the reactor 2 is coated with a powdered catalyst.

[0069] In this embodiment, reactor 2 and steam generator 3 are coupled into a single device using a shell-and-tube structure, i.e., reactor 2 is in the tube side and steam generator 3 is in the shell side. During normal operation, the mixed gas from gas mixer 1 flows downwards into the tube side, contacting the catalyst inside reactor 2. Hydrogen reacts with oxygen in the air to produce water, releasing a large amount of heat energy. Heated by this heat energy, the generated water is vaporized to form steam, which mixes with the reacting gas and flows continuously downwards along the tube side, leaving reactor 2 and entering gas-to-gas heat exchanger 4. The inner diameter of the upper section of steam generator 3 is larger than that of the lower section; the upper section is an enlarged section. This enlarged section serves two purposes: firstly, it separates the vapor and liquid, reducing water mist entrainment; secondly, it generates superheated steam, which helps prevent condensation during long-distance steam transport. When the steam generator 3 is working normally, water is continuously added to the shell side of the reactor from the first inlet W4 and flows upward, where it exchanges heat with the high-temperature gas flowing downward in the tubes of the reactor 2. During the downward flow, the high-temperature gas in the tube side heats the water in the shell side through the tube wall, causing the water to vaporize and generate steam. After the steam-liquid separation is achieved in the shell side expansion section, the steam continues to rise and is further heated by the reactor tubes at a higher temperature to generate superheated steam, which is discharged from the steam outlet S1 for downstream use.

[0070] In a preferred embodiment, such as Figure 1 As shown in the embodiment of this utility model, in the system for co-producing steam and nitrogen by hydrogen catalytic combustion, the first level gauge L1 is a magnetostrictive level gauge or a differential pressure transmitter; the second level gauge L2 is a magnetostrictive level gauge or a differential pressure transmitter; the first level gauge L1 and the second level gauge L2 are different.

[0071] In this embodiment, two level gauges are installed on the steam generator 3. If the water level in the steam generator 3 is too high, water will overflow from the steam outlet S1. If the water level is too low, the tubes of the reactor 2 will dry out and damage the reactor 2. The first level gauge L1 and the second level gauge L2 are installed so that the two level gauges can be compared and verified to improve the measurement accuracy. On the other hand, when one level gauge fails, the other level gauge can continue to work to keep the device running continuously and stably.

[0072] In a preferred embodiment, such as Figure 1 As shown in the embodiment of this utility model, in the system for co-producing steam and nitrogen by hydrogen catalytic combustion, the gas-to-gas heat exchanger 4 is a corrugated plate heat exchanger, a finned heat exchanger, or a shell-and-tube heat exchanger.

[0073] In this embodiment, the gas-to-gas heat exchanger 4 can recover the heat energy from the high-temperature reaction gas, thereby improving the thermal efficiency of the device. Through cross-flow heat exchange between the low-temperature circulating gas and the high-temperature reaction gas, the heat energy is carried back to the reactor 2 and generated into water vapor through the steam generator 3.

[0074] In a preferred embodiment, such as Figure 1 As shown in the embodiment of this utility model, in the system for co-producing steam and nitrogen by hydrogen catalytic combustion, the gas-water heat exchanger 5 is a corrugated plate heat exchanger, a finned heat exchanger, or a shell-and-tube heat exchanger.

[0075] In this embodiment, the gas-water heat exchanger 5 can further recover the heat energy in the reaction gas, improving the thermal efficiency of the device. Through cross-flow heat exchange between the low-temperature water and the high-temperature reaction gas, the heat energy is carried back to the steam generator 3.

[0076] In a preferred embodiment, such as Figure 1 As shown in the embodiment of this utility model, in the system for co-producing steam and nitrogen by hydrogen catalytic combustion, the gas-water separator 6 is a wire mesh type, a grid type, a louver type, or a swirl type.

[0077] In this embodiment, the gas-water separator 6 can separate gas from water, reduce the moisture content of the circulating gas, and at the same time, the separated water can be used as a supplement to the system water supply, thereby improving the water utilization rate.

[0078] In a preferred embodiment, such as Figure 1 As shown in the embodiment of this utility model, in the system for co-producing steam and nitrogen by hydrogen catalytic combustion, the water supply pump 8 is a centrifugal pump, a vortex pump, a multistage pump, or a positive displacement pump.

[0079] In this embodiment, the water supply pump 8 can replenish water to the steam generator, and the water level of the steam generator 3 is stabilized by a water level control loop consisting of the water level of the steam generator 3 and the outlet flow regulating valve of the water supply pump 8.

[0080] In one specific embodiment, the process flow of the system for co-producing steam and nitrogen by hydrogen catalytic combustion is as follows:

[0081] 1. Hydrogen and fresh air are mixed in gas mixer 1. After being mixed evenly, the mixture enters reactor 2. In reactor 2, a combustion reaction occurs to produce water and release heat energy. The generated water is vaporized into water vapor and mixed with the high-temperature gas after the reaction, flowing downward into the tube of steam generator 3.

[0082] 2. The high-temperature gas after the reaction heats and vaporizes the hot water from the gas-water heat exchanger 5 in the shell side of the steam generator 3. The water vapor generated in the shell side achieves vapor-liquid separation in the expansion section of the steam generator 3 and continues to rise and is discharged from the water vapor outlet S1 for downstream use; the high-temperature gas after the reaction continues to fall and enters the gas-gas heat exchanger 4.

[0083] 3. The high-temperature gas after the reaction exchanges heat with the low-temperature circulating gas in the gas-gas heat exchanger 4 through the cross-flow partition wall, recovering the heat energy of the high-temperature gas after the reaction and returning it to the reactor 2. The high-temperature gas after the reaction continues to flow downward into the gas-water heat exchanger 5.

[0084] 4. The high-temperature gas after the reaction exchanges heat with the low-temperature water in the gas-water heat exchanger 5 to produce hot water which then enters the steam generator 3.

[0085] 5. The high-temperature gas after the reaction leaves the gas-water heat exchanger 5 and enters the gas-water separator 6, where the gas and water are separated. The separated gas is pressurized by the gas circulator 7 and split into two streams. One stream passes through the gas-gas heat exchanger 4 and enters the gas mixer 1, where it mixes with the feed hydrogen and oxygen and enters the reactor 2. The other stream is discharged as nitrogen through the tail gas outlet VT for downstream use. The separated water, as a supplement to the unit's feed water, enters the unit from the gas-water heat exchanger 5 along with the soft water supplied by the feed water pump 8.

[0086] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A system for the co-production of steam and nitrogen by catalytic combustion of hydrogen, characterized in that, The system includes a gas mixer (1), a reactor (2), a steam generator (3), a gas-to-gas heat exchanger (4), a gas-to-water heat exchanger (5), a gas-to-water separator (6), and a water pump (8). The gas mixer (1) is provided with a rupture disc interface (11) at the top, and a hydrogen inlet (12), an air inlet (13) and a first inlet for circulating gas (X1) are also provided on the top side. The bottom of the gas mixer (1) is connected to the top of the reactor (2). The bottom of the reactor (2) is connected to the top of the gas-to-gas heat exchanger (4). The reactor (2) is located inside the steam generator (3). The reactor (2) and the steam generator (3) form a shell-and-tube structure. The inner diameter of the upper half of the steam generator (3) is larger than that of the lower half. The upper half of the steam generator (3) is provided with a first level gauge (L1) and a steam outlet (S1). The lower half of the steam generator (3) is provided with a second level gauge (L2) and a first water inlet (W4). The upper part of the steam generator (3) is connected to the gas mixer (1). The lower part of the steam generator (3) is connected to the gas-to-gas heat exchanger (4). The lower part of the gas-gas heat exchanger (4) is provided with a second circulating gas inlet (X3), the upper part of the gas-gas heat exchanger (4) is provided with a second circulating gas outlet (X4), the second circulating gas outlet (X4) is connected to the first circulating gas inlet (X1) through a pipeline, and the bottom of the gas-gas heat exchanger (4) is connected to the top of the gas-water heat exchanger (5). The gas-water heat exchanger (5) is provided with a second water inlet (W2) at the bottom and a second water outlet (W3) at the top. The second water outlet (W3) is connected to the first water inlet (W4) through a pipeline. The bottom of the gas-water heat exchanger (5) is connected to the top of the gas-water separator (6). The gas-water separator (6) is provided with a first circulating gas outlet (X2) at the top, which is connected to the second circulating gas inlet (X3) through a pipeline. The pipeline connecting the first circulating gas outlet (X2) and the second circulating gas inlet (X3) is also provided with a tail gas discharge port (VT). The gas-water separator (6) is provided with a first water outlet (W1) at the bottom, which is connected to the second water inlet (W2) through a pipeline. The water pump (8) is connected to the soft water feed pipe (14) and the second water inlet (W2), and is suitable for replenishing water to the system.

2. The system for co-producing steam and nitrogen by hydrogen catalytic combustion according to claim 1, characterized in that, The system also includes a PLC control device. The hydrogen inlet (12), air inlet (13), first circulating gas inlet (X1), first circulating gas outlet (X2), second circulating gas inlet (X3), second circulating gas outlet (X4), steam outlet (S1), first water outlet (W1), second water inlet (W2), second water outlet (W3), first water inlet (W4), exhaust gas outlet (VT), and outlet of water pump (8) are all equipped with control valves. The control valves are respectively connected to the PLC control device.

3. The system for co-producing steam and nitrogen by hydrogen catalytic combustion according to claim 2, characterized in that, The gas mixer (1) is also equipped with a hydrogen concentration detector. The reactor (2) is also equipped with a first temperature instrument, a first pressure instrument and a bed pressure drop detection instrument. The steam generator (3) is also equipped with a second temperature instrument and a second pressure instrument. The gas-gas heat exchanger (4) is also equipped with a first reaction gas inlet / outlet temperature detection instrument and a circulating gas inlet / outlet temperature detection instrument. The gas-water heat exchanger (5) is also equipped with a second reaction gas inlet / outlet temperature detection instrument and a water inlet / outlet temperature detection instrument. The gas-water separator (6) is also equipped with a third temperature instrument and a humidity detection instrument. The hydrogen concentration detector, the first temperature instrument, the first pressure instrument, the bed pressure drop detection instrument, the second temperature instrument, the second pressure instrument, the first reaction gas inlet / outlet temperature detection instrument, the circulating gas inlet / outlet temperature detection instrument, the second reaction gas inlet / outlet temperature detection instrument, the water inlet / outlet temperature detection instrument, the third temperature instrument and the humidity detection instrument, the first level gauge (L1), and the second level gauge (L2) are respectively connected to the PLC control device.

4. The system for co-producing steam and nitrogen by hydrogen catalytic combustion according to claim 1, characterized in that, A gas circulator (7) is provided in the pipeline connecting the first outlet (X2) of the circulating gas and the second inlet (X3) of the circulating gas, and the exhaust gas outlet (VT) is located on the outlet pipeline of the gas circulator (7).

5. The system for co-producing steam and nitrogen by hydrogen catalytic combustion according to claim 4, characterized in that, The gas circulator (7) is a fan, compressor, or booster pump.

6. The system for co-producing steam and nitrogen by hydrogen catalytic combustion according to claim 1, characterized in that, The gas mixer (1) is a static mixer or a wire mesh mixer.

7. The system for co-producing steam and nitrogen by hydrogen catalytic combustion according to claim 1, characterized in that, The reactor (2) is a vertical tubular reactor; the interior of the reactor (2) is filled with particulate catalyst, or the inner surface of the reactor (2) is coated with powdered catalyst.

8. The system for co-producing steam and nitrogen by hydrogen catalytic combustion according to claim 1, characterized in that, The first level gauge (L1) is a magnetostrictive level gauge or a differential pressure transmitter; the second level gauge (L2) is a magnetostrictive level gauge or a differential pressure transmitter; the first level gauge (L1) and the second level gauge (L2) are different.

9. The system for co-producing steam and nitrogen by hydrogen catalytic combustion according to claim 1, characterized in that, The gas-to-gas heat exchanger (4) is a corrugated plate heat exchanger, a finned heat exchanger, or a shell-and-tube heat exchanger. And / or, the gas-water heat exchanger (5) is a corrugated plate heat exchanger, a finned heat exchanger, or a shell-and-tube heat exchanger. And / or, the gas-water separator (6) is a wire mesh type, a grid type, a louver type, or a vortex type.

10. The system for co-producing steam and nitrogen by hydrogen catalytic combustion according to claim 1, characterized in that, The water supply pump (8) is a centrifugal pump, a vortex pump, a multistage pump, or a positive displacement pump.

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