A cogeneration plant for steam and nitrogen

Abstract

The utility model provides a kind of cogeneration device of steam and nitrogen, from gas feed end along gas flow direction, the device includes sequentially interconnected gas mixer, reactor, steam superheater, first gas-water heat exchanger, gas-gas heat exchanger, second gas-water heat exchanger and gas-water separator, it further includes steam drum and feed pump, the utility model realizes the purpose of hydrogen catalyst combustion cogeneration steam and nitrogen, and process equipment is simple, the utility model's steam and nitrogen's cogeneration device, intersect in the catalyst bed layer of multiple series in prior art, pressure drop reduces, involves detection instrument reduces, operating and maintenance cost reduces, combined with PLC control system, realize automation, large-scale operation.

Description

Technical Field

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

[0002] Hydrogen catalytic combustion technology typically refers to the low-temperature, flameless combustion of hydrogen and oxygen (or air) under the action of a catalyst. The heat generated can be used directly as a heat source, or it can be exchanged with water to produce hot water or high-temperature steam for heating, driving steam turbines for power generation, or as an industrial heat source. Compared with traditional hydrogen boilers, hydrogen catalytic combustion technology has advantages such as low combustion temperature, controllable combustion temperature, high combustion efficiency, and no nitrogen oxide emissions, and has become one of the hot topics in research and development in recent years.

[0003] CN116920728A discloses a zero-carbon emission device and process for generating hot air, high-temperature steam, or producing pure water. Its working principle is as follows: the flow rates of both air and hydrogen can be regulated. Four hydrogen inlets and one air inlet are provided within the catalyst bed. The air flows along the catalyst bed, and hydrogen is added in stages, ensuring that the amount of hydrogen introduced in each stage does not exceed the explosion limit of the mixed gas. On the catalyst, air and hydrogen react in the catalyst bed to produce water. This patent uses a series introduction of hydrogen to react with air.

[0004] However, the multi-stage series reaction multi-point feed process has the following problems: First, it requires each reaction stage to be equipped with temperature, pressure, humidity, hydrogen concentration, hydrogen flow and other monitoring instruments, which leads to complex processes, numerous instruments, large equipment, high investment and high failure rate; Second, the water produced in the reaction must be separated in time, otherwise it will reduce the performance of the catalyst; Third, the multi-stage series reaction system is composed of multiple catalyst beds connected in series, which makes catalyst loading and unloading troublesome, increases the resistance of the catalyst bed, requires higher pressure from hydrogen and air feedstock, and increases costs; Fourth, it does not produce nitrogen.

[0005] In summary, existing technologies and equipment involve high investment, high operating costs, cumbersome operation and maintenance, low automation, poor economic benefits, and are difficult to scale up and industrialize. Utility Model Content

[0006] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a steam and nitrogen co-production device to solve the problems of high investment, high operating costs, cumbersome operation and maintenance, low degree of automation, poor economic benefits, inability to co-produce nitrogen, and difficulty in achieving large-scale and industrialization in the prior art.

[0007] To achieve the above and other related objectives, this utility model provides a steam and nitrogen co-production device. Starting from the gas feed end along the gas flow direction, the device includes a gas mixer, a reactor, a steam superheater, a first gas-water heat exchanger, a gas-gas heat exchanger, a second gas-water heat exchanger, and a gas-water separator connected in sequence. 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 also provided on the top side. The bottom of the gas mixer is connected to the top of the reactor. The bottom of the reactor is connected to the top of the steam superheater. The upper part of the steam superheater is also provided with a second steam outlet, and the lower part of the steam superheater is provided with a steam inlet. The bottom of the steam superheater is connected to the top of the first gas-water heat exchanger. The first gas-water heat exchanger has a third water outlet at its upper part and a second water inlet at its lower part. The bottom of the first gas-water heat exchanger is connected to the top of the gas-gas heat exchanger. 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 second gas-water heat exchanger. The second gas-water heat exchanger has a first water inlet at its lower part and a second water outlet at its upper part. The second water outlet is connected to the second water inlet through a pipeline. The bottom of the second gas-water heat exchanger is connected to the top of the gas-water separator. 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 the first inlet for water through a pipeline. The device also includes a steam drum, the bottom of which is connected to the third outlet of the first gas-water heat exchanger, and the top of which is provided with a first steam outlet, which is connected to the steam inlet of the steam superheater. The device also includes a water supply pump, which is connected to the soft water inlet pipeline and the first water inlet, and is adapted to replenish water to the device.

[0008] Preferably, the upper part of the steam drum is provided with a first level gauge, and the lower part is provided with a second level gauge.

[0009] Preferably, the device further includes a PLC control system, and the hydrogen inlet, air inlet, first circulating gas inlet, first circulating gas outlet, second circulating gas inlet, second circulating gas outlet, first steam outlet, steam inlet, second steam outlet, first water outlet, first water inlet, second water outlet, second water inlet, third water outlet, exhaust gas outlet, and water pump outlet are all equipped with control valves, and the control valves are respectively connected to the PLC control system.

[0010] 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.

[0011] Preferably, the gas mixer is a static mixer or a wire mesh mixer.

[0012] Preferably, the reactor is a fixed-bed reactor; the interior of the reactor is filled with a particulate catalyst.

[0013] Preferably, the steam superheater is a corrugated plate heat exchanger, a finned heat exchanger, or a shell-and-tube heat exchanger.

[0014] Preferably, the first gas-water heat exchanger is a corrugated plate heat exchanger, a finned heat exchanger, or a shell-and-tube heat exchanger.

[0015] Preferably, the gas-to-gas heat exchanger is a corrugated plate heat exchanger, a finned heat exchanger, or a shell-and-tube heat exchanger.

[0016] Preferably, the second gas-water heat exchanger is a corrugated plate heat exchanger, a finned heat exchanger, or a shell-and-tube heat exchanger.

[0017] Preferably, the gas-water separator is a wire mesh type, a grid type, a louver type, or a vortex type.

[0018] Preferably, the water supply pump is a centrifugal pump, a vortex pump, a multistage pump, or a positive displacement pump.

[0019] As described above, the steam and nitrogen co-production device of this invention has the following beneficial effects: This invention relates to a steam and nitrogen co-production device. Through a gas mixer, reactor, steam superheater, first gas-water heat exchanger, gas-gas heat exchanger, second gas-water heat exchanger, and gas-water separator connected in sequence, along with a steam drum and feedwater pump, it achieves the co-production of steam and nitrogen from hydrogen catalyst combustion. The process and equipment are simple; the catalyst bed in this invention is only one section, unlike the multi-stage series catalyst beds in existing technologies, resulting in reduced pressure drop, fewer monitoring instruments, and lower operating and maintenance costs. Furthermore, by integrating a PLC control system, it achieves automated and large-scale operation.

[0020] This invention's steam and nitrogen cogeneration unit employs independent steam drums and steam superheaters. The independently configured steam drum provides more space and time for steam and water to separate, resulting in more thorough steam-water separation, reducing the free water content in the steam, and improving steam quality. The independently configured steam superheater has a wide adjustable range of temperature and pressure, enabling the production of high-grade steam to meet diverse downstream needs. Furthermore, this invention also independently configures the first gas-water heat exchanger 4 and the steam drum 5, allowing for relatively independent functions. This enables specialized equipment to perform specialized tasks, making equipment selection and design more diverse and flexible, improving the operational flexibility and reliability of the unit, and facilitating its large-scale, standardized, and modular development. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the steam and nitrogen co-production device of this utility model.

[0022] Explanation of icon numbers 2 reactor 3 Steam superheater 4 First gas-water heat exchanger 5 Steam drum 6 gas-to-gas heat exchanger 7 Second gas-water heat exchanger 8 gas-water separator 9 Gas circulator 10 water pump 11 Explosive fragment interface 12 hydrogen inlet 13 Air inlet 14 Soft water inlet pipe L1 First liquid level gauge L2 Second liquid level gauge X1 First feed inlet of circulating gas X2 First outlet of circulating gas X3 Second feed inlet of circulating gas X4 Second outlet of circulating gas W1 First water outlet W2 First water inlet W3 Second water outlet W4 Second water inlet W5 Third water outlet S1 First steam outlet S2 Steam inlet S3 Second steam outlet VT exhaust outlet Detailed Implementation

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] This utility model provides a steam and nitrogen co-production device. Starting from the gas feed end along the gas flow direction, the device includes a gas mixer 1, a reactor 2, a steam superheater 3, a first gas-water heat exchanger 4, a gas-gas heat exchanger 6, a second gas-water heat exchanger 7, and a gas-water separator 8 connected in sequence. 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 top of the reactor 2. The bottom of the reactor 2 is connected to the top of the steam superheater 3. The upper part of the steam superheater 3 is also provided with a second steam outlet S3, and the lower part of the steam superheater 3 is provided with a steam inlet S2. The bottom of the steam superheater 3 is connected to the top of the first gas-water heat exchanger 4. The first gas-water heat exchanger 4 has a third outlet W5 at its upper part and a second inlet W4 at its lower part. The bottom of the first gas-water heat exchanger 4 is connected to the top of the gas-gas heat exchanger 6. The lower part of the gas-gas heat exchanger 6 is provided with a second circulating gas inlet X3, the upper part of the gas-gas heat exchanger 6 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 6 is connected to the top of the second gas-water heat exchanger 7. The second gas-water heat exchanger 7 is provided with a first water inlet W2 at the bottom and a second water outlet W3 at the top. The second water outlet W3 is connected to the second water inlet W4 through a pipeline. The bottom of the second gas-water heat exchanger 7 is connected to the top of the gas-water separator 8. The gas-water separator 8 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 outlet VT. The bottom of the gas-water separator 8 is provided with a first water outlet W1, which is connected to the first water inlet W2 through a pipeline. The device also includes a steam drum 5, the bottom of which is connected to the third outlet W5 on the first gas-water heat exchanger 4, and the top of the steam drum 5 is provided with a first steam outlet S1, which is connected to the steam inlet S2 on the steam superheater 3. The device also includes a water supply pump 10, which is connected to the soft water inlet pipe 14 and the first water inlet W2, and is adapted to replenish water to the device.

[0028] In this embodiment, the steam drum 5 is a device for converting superheated water into saturated steam and separating steam from water.

[0029] In a preferred embodiment, such as Figure 1 As shown in the embodiment of this utility model, in the steam and nitrogen co-production device, the upper part of the steam drum 5 is provided with a first liquid level gauge L1, and the lower part is provided with a second liquid level gauge L2.

[0030] In this embodiment, the first level gauge L1 is a magnetostrictive level gauge or a differential pressure transmitter, and 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. Using two level gauges serves two purposes: firstly, the two level gauges can be compared and verified against each other, improving measurement accuracy; secondly, if one level gauge malfunctions, the other level gauge can continue to operate, maintaining continuous and stable operation of the device.

[0031] In a preferred embodiment, the steam and nitrogen co-production device shown in this utility model embodiment further includes a PLC control system. 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, first steam outlet S1, steam inlet S2, second steam outlet S3, first water outlet W1, first water inlet W2, second water outlet W3, second water inlet W4, third water outlet W5, exhaust gas outlet VT, and the outlet of the water pump 10 are all equipped with control valves, which are respectively connected to the PLC control system.

[0032] 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 superheater 3 is further equipped with a second temperature instrument; the first gas-water heat exchanger 4 is further equipped with a first reactant gas inlet / outlet temperature detection instrument and a water inlet / outlet temperature detection instrument; the steam drum 5 is further equipped with a third temperature instrument, a second pressure instrument, and a liquid level instrument; the gas-gas heat exchanger 6 is further equipped with a second reactant gas inlet / outlet temperature detection instrument and a circulating gas inlet / outlet temperature detection instrument; and the second gas-water heat exchanger 7 is further equipped with a third reactant gas inlet / outlet temperature detection instrument. The gas-water separator 8 is equipped with inlet and outlet temperature detection instruments and water inlet and outlet temperature detection instruments. It is also equipped with a fourth 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 first reactant gas inlet and outlet temperature detection instrument, the third temperature instrument, the second pressure instrument, the liquid level instrument, the second reactant gas inlet and outlet temperature detection instrument, the circulating gas inlet and outlet temperature detection instrument, the third reactant gas inlet and outlet temperature detection instrument, the water inlet and outlet temperature detection instrument, the fourth temperature instrument, the humidity detection instrument, the first liquid level gauge L1 and the second liquid level gauge L2 are respectively connected to the PLC control system device.

[0033] In a preferred embodiment, such as Figure 1 As shown in the embodiment of this utility model, in the steam and nitrogen co-production device, a gas circulator 9 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 tail gas discharge port VT is provided in the outlet pipeline of the gas circulator 9.

[0034] In a more preferred embodiment, the gas circulator 9 is a fan, compressor, or booster pump.

[0035] In this embodiment, the function of the gas circulator 9 is to circulate the reaction gas back to the reactor 2, and control the oxygen content of the reactor outlet gas to meet the process requirements by controlling the circulation ratio.

[0036] In a preferred embodiment, such as Figure 1 As shown in the embodiment of this utility model, in the steam and nitrogen co-production device, the gas mixer 1 is a static mixer or a wire mesh mixer.

[0037] In this embodiment, the function of the gas mixer 1 is to mix the newly added hydrogen, air and circulating gas evenly to avoid the local hydrogen concentration exceeding the lower explosive limit and increasing the safety risk. In addition, even mixing is conducive to full contact between hydrogen and oxygen, resulting in more complete combustion.

[0038] In a preferred embodiment, such as Figure 1 As shown in the embodiment of this utility model, in the steam and nitrogen co-production device, the reactor 2 is a fixed-bed reactor; the interior of the reactor 2 is filled with a granular catalyst.

[0039] In this embodiment, the reactor 2 is the site of the catalytic combustion reaction. During normal operation, the mixed gas from the gas mixer 1 flows downward into the reactor and comes into contact with the catalyst. Hydrogen reacts with oxygen in the air to generate water and releases a large amount of heat energy. Under the heating of the heat energy, the generated water is vaporized to form water vapor, which mixes with the reaction gas and flows continuously downward away from the reactor bed and into the steam superheater 3.

[0040] In a preferred embodiment, such as Figure 1 As shown in the embodiment of this utility model, in the steam and nitrogen cogeneration device, the steam superheater 3 is a corrugated plate heat exchanger, a finned heat exchanger, or a shell-and-tube heat exchanger.

[0041] In this embodiment, the function of the steam superheater 3 is to heat the saturated water vapor with high-temperature reaction gas to form superheated steam, thereby preventing the steam from condensing in the conveying pipeline.

[0042] In a preferred embodiment, such as Figure 1 As shown in the embodiment of this utility model, in the steam and nitrogen cogeneration device, the first gas-water heat exchanger 4 is a corrugated plate heat exchanger, a finned heat exchanger, or a shell-and-tube heat exchanger.

[0043] In this embodiment, the function of the first gas-water heat exchanger 4 is to realize heat exchange between high-temperature reaction gas and low-temperature water to generate superheated water.

[0044] In a preferred embodiment, such as Figure 1 As shown in the embodiment of this utility model, in the steam and nitrogen cogeneration device, the gas-to-gas heat exchanger 6 is a corrugated plate heat exchanger, a finned heat exchanger, or a shell-and-tube heat exchanger.

[0045] In this embodiment, the gas-to-gas heat exchanger 6 functions to recover 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 and then generated as steam through the steam superheater 3.

[0046] In a preferred embodiment, such as Figure 1 As shown in the embodiment of this utility model, in the steam and nitrogen cogeneration device, the second gas-water heat exchanger 7 is a corrugated plate heat exchanger, a finned heat exchanger, or a shell-and-tube heat exchanger.

[0047] In this embodiment, the second gas-water heat exchanger 7 serves to further recover heat energy from the reaction gas, thereby improving the thermal efficiency of the device. Heat energy is recovered through heat exchange via a cross-flow partition between low-temperature water and high-temperature reaction gas.

[0048] In a preferred embodiment, such as Figure 1 As shown in the embodiment of this utility model, in the steam and nitrogen co-production device, the gas-water separator 8 is a wire mesh type, a grid type, a louver type, or a cyclone type.

[0049] In this embodiment, the gas-water separator 8 separates gas from water, reduces the moisture content of the circulating gas, and uses the separated water as a supplement to the device's water supply, thereby improving water utilization.

[0050] In a preferred embodiment, such as Figure 1 As shown in the embodiment of this utility model, in the steam and nitrogen cogeneration device, the feed water pump 10 is a centrifugal pump, a vortex pump, a multistage pump, or a positive displacement pump.

[0051] In this embodiment, the function of the water supply pump 10 is to replenish water to the steam drum 5, and to control the stability of the steam drum 5 liquid level through a liquid level control loop composed of the steam drum 5 liquid level and the pump outlet flow regulating valve.

[0052] In one specific embodiment, the process flow of the steam and nitrogen co-production unit is as follows: 1. Hydrogen and air are mixed in gas mixer 1. After being mixed evenly, they enter 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, and then flows down into steam superheater 3.

[0053] 2. The high-temperature gas after the reaction heats the water vapor from the steam drum 5 in the pipeline in the steam superheater 3, forming superheated steam which is discharged from the second water vapor outlet S3 for downstream use; the high-temperature gas after the reaction continues to flow downward into the first gas-water heat exchanger 4.

[0054] 3. The high-temperature gas after the reaction exchanges heat with the low-temperature water in the pipeline in the first gas-water heat exchanger 4 to produce superheated water which enters the steam drum 5; the high-temperature gas after the reaction continues to flow downward into the gas-gas heat exchanger 6.

[0055] 4. The high-temperature gas after the reaction exchanges heat with the low-temperature circulating gas in the gas-gas heat exchanger 6 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 second gas-water heat exchanger 7.

[0056] 5. The high-temperature gas after the reaction exchanges heat with the low-temperature water in the second gas-water heat exchanger 7 to produce hot water which enters the first gas-water heat exchanger 4.

[0057] 6. The high-temperature gas after the reaction leaves the second gas-water heat exchanger 7 and enters the gas-water separator 8, where the gas and water are separated. The separated gas is pressurized by the gas circulator 9 and split into two streams. One stream passes through the gas-gas heat exchanger 6 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 together with the soft water supplied by the feed water pump 10 from the second gas-water heat exchanger 7.

[0058] 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 steam and nitrogen cogeneration unit, characterized in that, Starting from the gas feed end along the gas flow direction, the device includes a gas mixer (1), a reactor (2), a steam superheater (3), a first gas-water heat exchanger (4), a gas-gas heat exchanger (6), a second gas-water heat exchanger (7), and a gas-water separator (8) connected in sequence. 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 steam superheater (3). The upper part of the steam superheater (3) is also provided with a second steam outlet (S3), and the lower part of the steam superheater (3) is provided with a steam inlet (S2). The bottom of the steam superheater (3) is connected to the top of the first gas-water heat exchanger (4). The first gas-water heat exchanger (4) has a third outlet (W5) at its upper part and a second inlet (W4) at its lower part. The bottom of the first gas-water heat exchanger (4) is connected to the top of the gas-gas heat exchanger (6). The lower part of the gas-gas heat exchanger (6) is provided with a second circulating gas inlet (X3), the upper part of the gas-gas heat exchanger (6) 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 (6) is connected to the top of the second gas-water heat exchanger (7). The second gas-water heat exchanger (7) is provided with a first water inlet (W2) at the bottom and a second water outlet (W3) at the top. The second water outlet (W3) is connected to the second water inlet (W4) through a pipeline. The bottom of the second gas-water heat exchanger (7) is connected to the top of the gas-water separator (8). The gas-water separator (8) 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 (8) is provided with a first water outlet (W1) at the bottom, which is connected to the first water inlet (W2) through a pipeline. The device also includes a steam drum (5), the bottom of which is connected to the third outlet (W5) on the first gas-water heat exchanger (4), and the top of the steam drum (5) is provided with a first steam outlet (S1), which is connected to the steam inlet (S2) on the steam superheater (3). The device also includes a water pump (10), which is connected to the soft water feed pipeline (14) and the first water inlet (W2) and is adapted to replenish water to the device.

2. The steam and nitrogen cogeneration unit according to claim 1, characterized in that, The upper part of the steam drum (5) is provided with a first liquid level gauge (L1), and the lower part is provided with a second liquid level gauge (L2).

3. The steam and nitrogen cogeneration unit according to claim 2, characterized in that, The device also includes a PLC control system. 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), first steam outlet (S1), steam inlet (S2), second steam outlet (S3), first water outlet (W1), first water inlet (W2), second water outlet (W3), second water inlet (W4), third water outlet (W5), exhaust gas outlet (VT), and the outlet of the water pump (10) are all equipped with control valves. The control valves are respectively connected to the PLC control system.

4. The steam and nitrogen cogeneration unit according to claim 3, 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 superheater (3) is also equipped with a second temperature instrument. The first gas-water heat exchanger (4) is also equipped with a first reactant gas inlet / outlet temperature detection instrument and a water inlet / outlet temperature detection instrument. The steam drum (5) is also equipped with a third temperature instrument, a second pressure instrument, and a liquid level instrument. The gas-gas heat exchanger (6) is also equipped with a second reactant gas inlet / outlet temperature detection instrument and a circulating gas inlet / outlet temperature detection instrument. The second gas-water heat exchanger (7) is also equipped with a third reactant gas inlet / outlet temperature detection instrument. The gas-water separator (8) is equipped with a fourth temperature instrument and a humidity instrument. The hydrogen concentration detector, the first temperature instrument, the first pressure instrument, the bed pressure drop detector, the second temperature instrument, the first reaction gas inlet and outlet temperature detector, the third temperature instrument, the second pressure instrument, the liquid level instrument, the second reaction gas inlet and outlet temperature detector, the circulating gas inlet and outlet temperature detector, the third reaction gas inlet and outlet temperature detector, the water inlet and outlet temperature detector, the fourth temperature instrument, the humidity instrument, the first liquid level gauge (L1), and the second liquid level gauge (L2) are respectively connected to the PLC control system.

5. The steam and nitrogen cogeneration unit according to claim 1, characterized in that, The pipeline connecting the first outlet (X2) of the circulating gas and the second inlet (X3) of the circulating gas is equipped with a gas circulator (9), and the exhaust gas outlet (VT) is located on the outlet pipeline of the gas circulator (9).

6. The steam and nitrogen cogeneration unit according to claim 5, characterized in that, The gas circulator is a fan, compressor, or booster pump.

7. The steam and nitrogen cogeneration unit according to claim 1, characterized in that, The gas mixer (1) is a static mixer or a wire mesh mixer; And / or, the reactor (2) is a fixed-bed reactor; the interior of the reactor (2) is filled with particulate catalyst.

8. The steam and nitrogen cogeneration unit according to claim 1, characterized in that, The steam superheater (3) is a corrugated plate heat exchanger, a finned heat exchanger, or a shell-and-tube heat exchanger. And / or, the first gas-water heat exchanger (4) is a corrugated plate heat exchanger, a finned heat exchanger, or a shell-and-tube heat exchanger. And / or, the gas-to-gas heat exchanger (6) is a corrugated plate heat exchanger, a finned heat exchanger, or a shell-and-tube heat exchanger. And / or, the second gas-water heat exchanger (7) is a corrugated plate heat exchanger, a finned heat exchanger, or a shell-and-tube heat exchanger.

9. The steam and nitrogen cogeneration unit according to claim 1, characterized in that, The gas-water separator (8) is a wire mesh type, a grid type, a louver type, or a vortex type.

10. The steam and nitrogen cogeneration unit according to claim 1, characterized in that, The water supply pump (10) is a centrifugal pump, a vortex pump, a multistage pump, or a positive displacement pump.

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