Natural gas reforming hydrogen production device

Abstract

The invention discloses a natural gas reforming hydrogen production device, which relates to the field of natural gas reforming hydrogen production and comprises a natural gas conveying unit, a heating desulfurization unit, a natural gas reforming unit and a first heat exchange unit. The natural gas conveying unit is provided with a natural gas output port. The heating desulfurization unit is provided with a desulfurization inlet and a desulfurization outlet. The natural gas reforming unit is provided with a reforming outlet and a reforming inlet communicated with the desulfurization outlet. The first heat exchange unit is provided with a first heat exchange channel and a second heat exchange channel which exchange heat with each other, an inlet and an outlet of the first heat exchange channel communicate with the natural gas output port and the desulfurization inlet correspondingly, and an inlet of the second heat exchange channel communicates with the reforming outlet. Wherein the second heat exchange channel is used for exchanging heat in output gas after hydrogen is prepared by the natural gas reforming unit to the first heat exchange channel. The natural gas reforming hydrogen production device disclosed by the invention is low in energy consumption and low in operation cost.

Description

Technical Field

[0001] This disclosure relates to the field of natural gas reforming for hydrogen production technology, and more particularly to natural gas reforming for hydrogen production equipment. Background Technology

[0002] Tetrahydrothiophene (THT), an odorizing sulfide, is added to natural gas pipelines at a concentration typically of 20 mg / m³. This is to ensure timely detection of leaks and prevent accidents. However, when natural gas is used for reforming to produce hydrogen, sulfides can interfere with the catalytic performance of the catalysts used in the process. Therefore, desulfurization of the feedstock natural gas is necessary before reforming it for hydrogen production.

[0003] Raw natural gas is often desulfurized using a heating desulfurization method. This method involves installing an additional heat source, such as an electric heater or combustion heater, before or on the desulfurization unit. This results in high energy consumption and high operating costs. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the purpose of this disclosure is to provide a natural gas reforming hydrogen production unit with low energy consumption and low operating cost.

[0005] This disclosure provides a natural gas reforming hydrogen production apparatus, comprising: a natural gas conveying unit having a natural gas outlet; a heating and desulfurization unit having a desulfurization inlet and a desulfurization outlet for supplying heated natural gas for desulfurization reaction; a natural gas reforming unit having a reforming outlet and a reforming inlet connected to the desulfurization outlet for supplying steam to react with the desulfurized natural gas to produce hydrogen; and a first heat exchange unit having a first heat exchange channel and a second heat exchange channel for mutual heat exchange, the inlet and outlet of the first heat exchange channel being connected to the natural gas outlet and the desulfurization inlet respectively, and the inlet of the second heat exchange channel being connected to the reforming outlet for heating the natural gas before desulfurization; wherein, the second heat exchange channel is used to exchange heat from the gas output after hydrogen production by the natural gas reforming unit to the first heat exchange channel.

[0006] According to some embodiments provided in this disclosure, it further includes: a second heat exchange unit, a third heat exchange channel and a fourth heat exchange channel having heat exchange, wherein the inlet and outlet of the third heat exchange channel are respectively connected to the natural gas outlet and the inlet of the first heat exchange channel, and the inlet and outlet of the fourth heat exchange channel are respectively connected to the desulfurization outlet and the reforming inlet.

[0007] According to some embodiments provided in this disclosure, it further includes: a gas distribution pipeline, which is arranged in parallel with the first heat exchange unit; and a distribution component, which is connected to the downstream stage of the natural gas transmission unit, for adjusting the distribution ratio of the transmitted natural gas to the gas distribution pipeline and the first heat exchange channel, and is configured to adjust the distribution ratio according to the temperature of the natural gas delivered to the desulfurization inlet not meeting the optimal reaction temperature of the desulfurizing agent, so that the temperature of the natural gas delivered to the desulfurization inlet meets the optimal reaction temperature of the desulfurizing agent.

[0008] According to some embodiments provided in this disclosure, it further includes: a first temperature detection element disposed at the desulfurization inlet for detecting the natural gas temperature at the desulfurization inlet; and a control unit connected to the automatic distribution component and the first temperature detection element, respectively, for controlling the distribution component to adjust the distribution ratio according to the detected temperature not meeting the optimal reaction temperature of the desulfurizing agent, so that the adjusted natural gas temperature at the desulfurization inlet meets the optimal reaction temperature of the desulfurizing agent.

[0009] According to some embodiments provided in this disclosure, the distribution component includes: a first valve disposed in the gas distribution pipeline; and / or a second valve disposed at the inlet of the first heat exchange channel; wherein the first valve and / or the second valve are used to adjust the distribution ratio.

[0010] According to some embodiments provided in this disclosure, it further includes: a second temperature detection element disposed at the desulfurization outlet.

[0011] According to some embodiments provided in this disclosure, the natural gas transmission unit includes: a compressor connected to the downstream stage of the natural gas outlet.

[0012] According to some embodiments provided in this disclosure, the natural gas reforming unit includes: a conversion reactor having the reforming inlet for reacting methane and steam to produce hydrogen and carbon monoxide; and a shift reactor connected to the downstream stage of the conversion reactor and having the reforming outlet for reacting carbon monoxide and steam to produce hydrogen and carbon dioxide.

[0013] According to some embodiments provided in this disclosure, the heating desulfurization unit is a hydrodesulfurization unit.

[0014] According to some embodiments provided in this disclosure, it further includes: a third temperature detection element disposed between the second heat exchange unit and the first heat exchange unit.

[0015] Beneficial effects:

[0016] (1) The natural gas reforming hydrogen production device disclosed herein has a first heat exchange unit that can use the heat carried by the gas after natural gas reforming to heat the natural gas temperature before desulfurization to meet the heating temperature required for desulfurization. The heat recovery through the first heat exchange unit saves energy consumption and operating costs and avoids the need to add new heat sources.

[0017] (2) In the natural gas reforming hydrogen production device disclosed herein, the second heat exchange unit can utilize the heat carried by the desulfurized gas to preheat the temperature of the natural gas before desulfurization, and further recover heat through the second heat exchange unit.

[0018] (3) The natural gas reforming hydrogen production device disclosed herein can adjust the temperature of natural gas before desulfurization by means of a distribution component, so that the temperature of natural gas is more in line with the desulfurization reaction temperature of the desulfurizing agent, which is conducive to ensuring the desulfurization effect. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the layout of a natural gas reforming hydrogen production unit according to the first embodiment of this disclosure.

[0020] Figure 2 This is a schematic diagram of the arrangement of a natural gas reforming unit according to a second embodiment of the present disclosure.

[0021] Figure label:

[0022] 11. Natural gas transmission unit; 111. Natural gas outlet;

[0023] 12. Heating desulfurization unit; 121. Desulfurization inlet; 122. Desulfurization outlet;

[0024] 13. Natural gas reforming unit; 131. Conversion reactor; 1311. Reforming inlet; 132. Shift reactor; 1321. Reforming outlet;

[0025] 14. First heat exchange unit; 141. First heat exchange inlet; 142. First heat exchange outlet; 143. Second heat exchange inlet; 144. Second heat exchange outlet;

[0026] 15. Second heat exchange unit; 151. Third heat exchange inlet; 152. Third heat exchange outlet; 153. Fourth heat exchange inlet; 154. Fourth heat exchange outlet;

[0027] 16. First temperature detection component;

[0028] 17. Gas distribution pipeline;

[0029] 18. Distribution component; 181. First valve; 182. Second valve; 183. Parallel outlet; 184. Parallel inlet;

[0030] 21. First temperature detection component;

[0031] 22. Second temperature sensing element;

[0032] 23. Third temperature detection component. Detailed Implementation

[0033] The following specific examples illustrate the implementation of this disclosure. Those skilled in the art can easily understand other advantages and effects of this disclosure from the information disclosed herein. This disclosure can also be implemented or applied through other different specific embodiments, and various details in this disclosure can be modified or changed according to different viewpoints and application modules without departing from the spirit of this disclosure. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this disclosure can be combined with each other.

[0034] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings, so that those skilled in the art to which this disclosure pertains can readily implement it. This disclosure may be embodied in many different forms and is not limited to the embodiments described herein.

[0035] In this disclosure, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic represented in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. Furthermore, the specific features, structures, materials, or characteristics represented may be combined in any suitable manner in any one or a group of embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples represented in this disclosure, as well as the features of those different embodiments or examples.

[0036] Furthermore, the terms "first" and "second" are used for illustrative purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the representation of this disclosure, "a set" means two or more, unless otherwise explicitly specified.

[0037] For the purpose of clarity, devices unrelated to the description are omitted, and the same or similar components throughout the specification are given the same reference numerals.

[0038] Throughout this specification, when it is said that a device is "connected" to another device, this includes not only "direct connection" but also "indirect connection" by placing other components in between. Furthermore, when it is said that a device "comprises" a certain constituent element, unless otherwise stated otherwise, this does not exclude other constituent elements, but rather implies that other constituent elements may be included.

[0039] While the terms first, second, etc., are used in some examples herein to refer to various elements, these elements should not be limited by these terms. These terms are used only to distinguish one element from another. For example, first interface and second interface, etc., are used. Furthermore, as used herein, the singular forms “a,” “an,” and “the” are intended to also include the plural forms unless the context indicates otherwise. It should be further understood that the terms “comprising,” “including,” indicate the presence of the stated feature, step, operation, element, module, item, kind, and / or group, but do not exclude the presence, occurrence, or addition of one or more other features, steps, operations, elements, modules, items, kinds, and / or groups. The terms “or” and “and / or” as used herein are interpreted as inclusive, or mean any one or any combination thereof. Thus, “A, B, or C” or “A, B, and / or C” means “any one of: A; B; C; A and B; A and C; B and C; A, B, and C.” Exceptions to this definition will only occur if the combination of elements, functions, steps, or operations is inherently mutually exclusive in some way.

[0040] The technical terms used herein are for reference only to specific embodiments and are not intended to limit the scope of this disclosure. The singular form used herein includes the plural form unless the statement explicitly indicates otherwise. The word "comprising" as used in this specification means to specify a particular characteristic, region, integer, step, operation, element, and / or component, and does not exclude the presence or addition of other characteristics, regions, integers, steps, operations, elements, and / or components.

[0041] Although not explicitly defined, all terms, including technical and scientific terms used herein, shall have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. Terms defined in commonly used dictionaries shall be further interpreted as having a meaning consistent with the relevant technical literature and the message of the present disclosure, and shall not be over-interpreted as having an ideal or overly formulaic meaning unless otherwise defined.

[0042] In related technologies, desulfurization of the feedstock natural gas is required before reforming it into hydrogen. This desulfurization is often achieved through heating. However, this heating method involves installing electric or combustion heaters before or on the desulfurization unit, resulting in high energy consumption and operating costs.

[0043] In view of this, the present disclosure provides a natural gas reforming hydrogen production device, which does not require an additional heat source to heat the natural gas during desulfurization, resulting in low energy consumption and low operating costs.

[0044] Figure 1This is a schematic diagram of the layout of a natural gas reforming hydrogen production unit according to the first embodiment of this disclosure. (See also...) Figure 1 ,

[0045] The natural gas reforming hydrogen production unit disclosed herein includes a natural gas transmission unit 11, a heating and desulfurization unit 12, a natural gas reforming unit 13, and a first heat exchange unit 14.

[0046] The natural gas transmission unit 11 has a natural gas outlet 111.

[0047] Optionally, the natural gas transmission unit 11 includes a transmission pipeline for transmitting natural gas, the transmission pipeline having a natural gas outlet 111.

[0048] Optionally, the natural gas transmission unit 1 further includes a compressor, such as a compressor, which is connected to the pre-stage of the natural gas outlet 111 and is used to compress the natural gas and output the compressed natural gas. Compression helps to increase the temperature of the natural gas and the natural gas transmission efficiency. Specifically, after compression by the compressor, the temperature of the natural gas at the natural gas outlet 111 is about 100°C.

[0049] The heating desulfurization unit 12 has a desulfurization reaction chamber and a desulfurization inlet 121 and a desulfurization outlet 122 connected to the desulfurization reaction chamber, which are used to desulfurize the heated natural gas.

[0050] Optionally, the heating desulfurization unit 12 is a hydrodesulfurization unit. Natural gas hydrodesulfurization is a method that converts sulfides into easily removable hydrogen sulfide through a hydrogenation reaction, followed by hydrogen sulfide separation, achieving highly efficient desulfurization. Specifically, the reactions occurring within the heating desulfurization unit 12 are as follows:

[0051] C4H4S + 4H2 → C4H 10 +H2S;

[0052] ZnO + H2S → H2O + ZnS.

[0053] The natural gas reforming unit 13 has a reforming outlet 1321 and a reforming inlet 1311 connected to the desulfurization outlet 122. The natural gas reforming unit 13 is used to supply high-temperature steam to react with desulfurized natural gas to produce hydrogen. The natural gas reforming for hydrogen production utilizes the reaction of methane with high-temperature steam in the presence of a catalyst to produce carbon dioxide and hydrogen. The temperature of the gas output after natural gas reforming for hydrogen production, namely carbon dioxide and / or hydrogen, is higher than the temperature required for desulfurization by the heating desulfurization device.

[0054] The first heat exchange unit 14 has a first heat exchange channel and a second heat exchange channel that exchange heat with each other. The first heat exchange channel has a first heat exchange inlet 141 and a first heat exchange outlet 142 connected to the natural gas outlet 111 and the desulfurization inlet 121, respectively. The second heat exchange channel has a second heat exchange inlet 143 connected to the reforming outlet 1321, and is used to heat the natural gas before desulfurization. The second heat exchange channel is used to transfer the heat from the gas output after hydrogen production by the natural gas reforming unit 13 to the first heat exchange channel. Therefore, the heat carried by the gas output after hydrogen production by the natural gas reforming unit 13 can heat the gas before desulfurization, allowing it to be heated to the required desulfurization temperature without additional electricity or fuel consumption, thus reducing energy consumption and operating costs.

[0055] Figure 2 This is a schematic diagram of the arrangement of a natural gas reforming unit according to a second embodiment of this disclosure. (See also...) Figure 2 The natural gas reforming unit 13 includes a conversion reactor 131 and a shift reactor 132. The conversion reactor 131 has a reforming inlet 1311 and is used to react natural gas (methane) with high-temperature steam to produce hydrogen and carbon monoxide. The shift reactor 132 is connected to the downstream stage of the conversion reactor 131 and has a reforming outlet 1321, used to react carbon monoxide with high-temperature steam to produce hydrogen and carbon dioxide. Thus, through the above-mentioned conversion and shift reactions, the natural gas is reformed to produce hydrogen, achieving hydrogen production. Furthermore, both the conversion and shift reactions are carried out under high-temperature steam conditions, and the shift reaction is exothermic, releasing heat. The temperature of the final output gas after exothermic reaction is relatively high, exceeding the temperature required for natural gas desulfurization. Specifically, the temperature of the output gas after the shift reaction is approximately 420°C, higher than the 350°C~380°C required for natural gas hydrodesulfurization. However, it is understood that the natural gas reforming unit 13 protected by this disclosure includes, but is not limited to, other integrated devices capable of outputting high-temperature reformed gas are also within the scope of protection of this disclosure.

[0056] Optionally, see Figure 2The natural gas reforming hydrogen production unit further includes a gas distribution pipeline 17 and a distribution assembly 18. The gas distribution pipeline 17 is connected in parallel with the first heat exchange unit 14. The distribution assembly 18 is used to adjust the distribution ratio of natural gas to the gas distribution pipeline 17 and the first heat exchange channel, thereby adjusting the temperature of the natural gas delivered to the desulfurization inlet 121. Thus, since the raw material natural gas flowing through the gas distribution pipeline 17 is unheated and has a relatively low temperature, while the raw material natural gas flowing through the first heat exchange channel is heated and has a relatively high temperature, the temperature of the mixed natural gas will be between the two temperatures after mixing. Furthermore, the higher the distribution ratio of the gas distribution pipeline 17 and the lower the distribution ratio of the first heat exchange channel, the lower the temperature of the mixed natural gas; conversely, the lower the distribution ratio of the gas distribution pipeline 17 and the higher the distribution ratio of the first heat exchange channel, the higher the temperature of the mixed natural gas. Therefore, by setting up the gas distribution pipeline 17 and the distribution component 18, the temperature of the natural gas delivered to the desulfurization inlet 121 can be regulated, which helps to ensure that the temperature of the natural gas delivered to the desulfurization inlet 121 meets the optimal reaction temperature of the desulfurizing agent, thereby ensuring the desulfurization effect.

[0057] It is understood that the optimal reaction temperature of the desulfurizing agent is a preferred temperature range or value to ensure that the desulfurizing agent can undergo a good desulfurization reaction. If the temperature is lower than the optimal reaction temperature, the desulfurizing activity of the desulfurizing agent may not be activated / sufficiently activated, resulting in poor desulfurization effect. If the temperature is higher than the optimal reaction temperature, it may cause structural damage to the desulfurizing agent, resulting in poor desulfurization performance and effect. Therefore, heating the natural gas to the optimal reaction temperature before desulfurization is a better choice, which helps to ensure the reliability and effect of desulfurization.

[0058] Specifically, for the desulfurizing agent zinc oxide, the optimal reaction temperature for zinc oxide desulfurization is 350℃~380℃. For the above desulfurization reaction, a reaction temperature, i.e., the temperature of the natural gas during the reaction, between 350℃ and 380℃ is preferred. If the temperature is below 350℃, the desulfurization activity of zinc oxide may not be fully activated during the reaction, resulting in lower desulfurization efficiency and a relatively poor desulfurization effect. If the temperature is above 380℃, it may cause structural damage to zinc oxide, leading to poorer desulfurization performance and a relatively poor desulfurization effect. Therefore, when the temperature of the natural gas supplied to the desulfurization inlet 121 is below 350℃, the distribution ratio of the gas distribution pipeline 17 is reduced and the distribution ratio of the first heat exchange channel is increased, thereby increasing the temperature of the natural gas subsequently supplied to the desulfurization inlet 121. Correspondingly, when the temperature of the natural gas supplied to the desulfurization inlet 121 is higher than 380°C, the distribution ratio of the gas distribution pipeline 17 can be increased and the distribution ratio of the first heat exchange channel can be decreased, thereby reducing the temperature of the natural gas subsequently supplied to the desulfurization inlet 121. As a result, the natural gas output through the parallel outlet 183 of the first heat exchange channel and the gas distribution pipeline 17 can always be maintained at 350°C~380°C, which allows the zinc oxide to react with the natural gas at 350°C~380°C for desulfurization, thus helping to ensure the desulfurization effect of the zinc oxide.

[0059] In some examples, the distribution component 18 includes a first valve 181. The first valve 181 is located in the gas distribution pipeline 17. Specifically, the first valve 181 can be a manual valve or an automatic valve. When the opening of the first valve 181 is increased, the natural gas distribution ratio of the gas distribution pipeline 17 increases and the distribution ratio of the first heat exchange channel decreases. When the opening of the first valve 181 is decreased, the natural gas distribution ratio of the gas distribution pipeline 17 decreases and the distribution ratio of the first heat exchange channel increases.

[0060] In some examples, the distribution assembly 18 further includes a second valve 182. The second valve 182 is located at the inlet of the first heat exchange channel and is used to adjust the airflow ratio of the first heat exchange channel. Specifically, the second valve 182 is located in the connecting pipeline between the gas distribution pipeline 17 and the parallel inlet 184 of the first heat exchange channel and the inlet of the first heat exchange channel. Specifically, the second valve 182 can be a manual valve or an automatic valve. When the opening of the second valve 182 is increased, the natural gas distribution ratio of the gas distribution pipeline 17 decreases and the distribution ratio of the first heat exchange channel increases. When the opening of the second valve 182 is decreased, the natural gas distribution ratio of the gas distribution pipeline 17 increases and the distribution ratio of the first heat exchange channel decreases. Of course, the distribution assembly 18 may also include both a second valve 182 and a first valve 181, used to simultaneously adjust the distribution ratio through the first valve 181 and the second valve 182. Therefore, it is also possible for the gas distribution pipeline 17 to be disconnected, resulting in a wide adjustment range.

[0061] Optionally, the natural gas reforming hydrogen production unit further includes a first temperature detection element 21 and a control unit. The first temperature detection element 21 is located at the desulfurization inlet 121 and is used to detect the temperature of the natural gas at the desulfurization inlet 121.

[0062] Optionally, the first temperature detection element 21 can be a temperature sensor or a thermometer. The first temperature detection element 21 is located on the connecting pipeline between the parallel outlet 183 of the gas distribution pipeline 17 and the first heat exchange channel and the desulfurization inlet 121, so as to detect the temperature of the natural gas after adjustment and being transported to the desulfurization inlet 121, and then detect whether the temperature of the natural gas after temperature adjustment can indeed meet the optimal reaction temperature.

[0063] The control unit is connected to the automatic distribution component 18 and is also connected to the first temperature detection element 21. The control unit is used to control the distribution component 18 to adjust the distribution ratio according to the detected temperature outside the optimal reaction temperature, so that the natural gas temperature is maintained at the optimal reaction temperature after temperature adjustment.

[0064] For example, when the distribution assembly 18 includes an automatic first valve 181 and / or an automatic second valve 182, the control unit is communicatively connected to the automatic first valve 181 and / or the second valve 182 to control the opening degree of the first valve 181 and / or the second valve 182 outside the optimal reaction temperature according to the detected temperature, thereby automatically adjusting the distribution ratio so that the natural gas temperature is maintained at the optimal reaction temperature after temperature adjustment.

[0065] Optionally, the natural gas reforming hydrogen production unit further includes a second heat exchange unit 15. The second heat exchange unit 15 has a third heat exchange channel and a fourth heat exchange channel that exchange heat with each other. The third heat exchange inlet 151 and the third heat exchange outlet 152 of the third heat exchange channel are respectively connected to the natural gas outlet 111 and the first heat exchange inlet 141 of the first heat exchange channel, thereby connecting the natural gas outlet 111 and the first heat exchange inlet 141. The fourth heat exchange inlet 153 and the fourth heat exchange outlet 154 of the fourth heat exchange channel are respectively connected to the desulfurization outlet 122 and the reforming inlet 1311. Thus, after the natural gas is output from the natural gas outlet 111 and before entering the first heat exchange unit 14, the feedstock natural gas can be preheated by the desulfurized natural gas, for example, preheated to about 310°C, thereby reducing the heating burden on the subsequent first heat exchange unit 14 and further recovering heat from the desulfurized natural gas.

[0066] Optionally, the natural gas reforming hydrogen production unit further includes a second temperature detection element 22. The second temperature detection element 22 is located at the desulfurization outlet 122. Optionally, the second temperature detection element 22 can be a temperature sensor or a thermometer, and it is located on the connecting pipe between the heating desulfurization unit 12 and the second heat exchange unit 15. It is understood that the hydrodesulfurization reaction of natural gas is exothermic, and the temperature of the natural gas after desulfurization is usually higher than before desulfurization. Therefore, the second temperature detection element 22 can determine whether the hydrodesulfurization reaction of the natural gas is sufficient based on the temperature of the natural gas after desulfurization, thus determining whether the natural gas desulfurization is sufficient. Simultaneously, the temperature of the natural gas after desulfurization can also roughly determine whether the natural gas output from the natural gas outlet 111 can be sufficiently preheated, facilitating timely adjustments to ensure that the natural gas is sufficiently desulfurized and preheated.

[0067] Optionally, the natural gas reforming hydrogen production unit further includes a third temperature detection element 23. The third temperature detection element 23 is disposed between the second heat exchange unit 15 and the first heat exchange unit 14. Optionally, the third temperature detection element 23 can be a temperature sensor or a thermometer, and it is located on the connecting pipeline between the first heat exchange unit 14 and the second heat exchange unit 15. Thus, the third temperature detection element 23 can detect the temperature of the feedstock natural gas after preheating in the second heat exchange unit 15, to determine whether the feedstock natural gas has been sufficiently preheated.

[0068] The above embodiments are merely illustrative of the principles and effects of this disclosure and are not intended to limit this disclosure. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this disclosure. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this disclosure should still be covered by the protection scope of this disclosure.

Claims

1. A natural gas reforming hydrogen production unit, characterized in that, include: The natural gas transmission unit has a natural gas outlet. The heating desulfurization unit has a desulfurization inlet and a desulfurization outlet, and is used for the reaction desulfurization of the heated natural gas; The natural gas reforming unit has a reforming outlet and a reforming inlet connected to the desulfurization outlet, for supplying steam to react with the desulfurized natural gas to produce hydrogen. as well as The first heat exchange unit has a first heat exchange channel and a second heat exchange channel that exchange heat with each other. The inlet and outlet of the first heat exchange channel are respectively connected to the natural gas outlet and the desulfurization inlet, and the inlet of the second heat exchange channel is connected to the reforming outlet. The second heat exchange channel is used to exchange the heat in the gas output after the natural gas reforming unit produces hydrogen to the first heat exchange channel.

2. The natural gas reforming hydrogen production unit according to claim 1, characterized in that, Also includes: The second heat exchange unit has a third heat exchange channel and a fourth heat exchange channel for heat exchange. The inlet and outlet of the third heat exchange channel are respectively connected to the natural gas outlet and the inlet of the first heat exchange channel. The inlet and outlet of the fourth heat exchange channel are respectively connected to the desulfurization outlet and the reforming inlet.

3. The natural gas reforming hydrogen production unit according to claim 1, characterized in that, Also includes: The gas distribution pipeline is connected in parallel with the first heat exchange unit; A distribution component, connected to the downstream stage of the natural gas transmission unit, is used to adjust the distribution ratio of the transmitted natural gas to the gas distribution pipeline and the first heat exchange channel, and is configured to adjust the distribution ratio according to the fact that the temperature of the natural gas delivered to the desulfurization inlet does not meet the optimal reaction temperature of the desulfurizing agent, so that the temperature of the natural gas delivered to the desulfurization inlet meets the optimal reaction temperature of the desulfurizing agent.

4. The natural gas reforming hydrogen production unit according to claim 3, characterized in that, Also includes: A first temperature detection element is installed at the desulfurization inlet to detect the temperature of the natural gas at the desulfurization inlet. The control unit is connected to the automatic distribution component and the first temperature detection element, respectively, and is used to control the distribution component to adjust the distribution ratio according to the detected temperature not being within the optimal reaction temperature of the desulfurizing agent, so that the natural gas temperature at the desulfurization inlet after adjustment is within the optimal reaction temperature of the desulfurizing agent.

5. The natural gas reforming hydrogen production unit according to claim 3, characterized in that, The allocation component includes: A first valve is located in the gas distribution pipeline; and / or A second valve is located at the inlet of the first heat exchange channel; wherein the first valve and / or the second valve are used to adjust the distribution ratio.

6. The natural gas reforming hydrogen production apparatus according to claim 1, characterized in that, Also includes: The second temperature detection element is located at the desulfurization outlet.

7. The natural gas reforming hydrogen production unit according to claim 1, characterized in that, The natural gas transmission unit includes a compressor connected to the downstream stage of the natural gas outlet.

8. The natural gas reforming hydrogen production unit according to claim 1, characterized in that, The natural gas reforming unit includes: The reforming reactor, having the reforming inlet, is used to supply methane and steam for reaction to produce hydrogen and carbon monoxide; and, A conversion reactor, connected downstream of the conversion reactor, and having the reforming outlet, is provided for reacting carbon monoxide and water vapor to produce hydrogen and carbon dioxide.

9. The natural gas reforming hydrogen production apparatus according to claim 1, characterized in that, The heating desulfurization unit is a hydrodesulfurization unit.

10. The natural gas reforming hydrogen production apparatus according to claim 1, characterized in that, Also includes: The third temperature sensing element is disposed between the second heat exchange unit and the first heat exchange unit.

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