CN211998798U - Skid-mounted mobile on-site hydrogen production all-in-one machine - Google Patents

Abstract

The utility model provides a skid-mounted mobile on-site hydrogen production integrated machine, which comprises a gasifier, a drying filter, a preheating heater and an ammonia cracking hydrogen separation and purification unit which are sequentially communicated; the preheating heater comprises a waste heat recovery part and a heating branch part, wherein the heating branch part is provided with a branch manifold, and the outer side of the branch manifold is wound with a dry-burning heating wire; the ammonia pyrolysis hydrogen separation and purification unit comprises a hydrogen production part and a purification part; the hydrogen production part comprises an ammonia gas inlet manifold and a hydrogen gas outlet manifold; the hydrogen production part is also provided with a nitrogen outlet communicated with the waste heat recovery part; the purification section is filled with a molecular sieve adsorbent; the all-in-one machine is of an up-down structure; the outside of the all-in-one machine is separated from the outside by arranging a heat insulation plate, and the upper layer and the lower layer of the all-in-one machine are separated from each other by the heat insulation plate. Solves the problems of high energy consumption and high emission in the prior field hydrogen production technology.

Description

Skid-mounted mobile on-site hydrogen production all-in-one machine

Technical Field

The utility model relates to an ammonia schizolysis conversion hydrogen manufacturing equipment field particularly, especially relates to a sled dress formula removes on-the-spot hydrogen manufacturing all-in-one.

Background

Among various renewable energy sources, hydrogen energy is known as 'Mingzhu on the energy crown' and is a completely clean and renewable ultimate energy source. Although hydrogen is widely distributed, the existing amount of free hydrogen in the natural state is very small, and how to produce hydrogen by enrichment and purification with low carbon and environmental protection is a big problem of popularization of hydrogen energy at present. The storage and transportation after hydrogen production are complex and extremely expensive, the hydrogen storage tank with the design pressure of 98MPa needs to be produced to meet the requirements for gaseous pressure hydrogen storage, the hydrogen storage and transportation of liquid hydrogen needs to be liquefied by reducing the temperature of the hydrogen to-253 ℃ under normal pressure, and the requirements for storage tank technology difficulty and materials are extremely high. In the case of the above-mentioned technical immaturity, it is urgently necessary to find an alternative hydrogen production method with economical hydrogen storage. Therefore, the on-site hydrogen production technology is produced at the beginning, the problems of economy and safety of hydrogen energy storage and transportation after large-scale hydrogen production are eliminated, and technologies such as hydrogen station and the like which are used for on-site hydrogen production need to be used for on-site hydrogen production are more and more concerned by people.

Ammonia is used as an organic substance containing 17.6% of hydrogen by mass, a conventional catalyst is added at about 600-800 ℃ and normal pressure to be completely cracked into hydrogen and nitrogen, the conversion efficiency can reach 99.9%, and the method has very large on-site hydrogen production potential. 2.64 cubic meters of mixed gas can be prepared by each kilogram of liquid ammonia, wherein 1.98 cubic meters of hydrogen and 0.66 cubic meter of nitrogen are contained, and other nitrogen, oxygen and carbon pollutants are not contained. And the volume energy density of the liquid ammonia is 1.53 times of that of the liquid hydrogen, and the energy storage and transportation rate is higher under the same volume condition. At present, the price of hydrogen in domestic hydrogen stations is about 70 yuan per kilogram, while the price of liquid ammonia is about 3000 yuan per ton, and the hydrogen obtained by decomposition is about 16.7 yuan per kilogram, wherein the price difference of the costs of hydrogen and ammonia in storage, transportation, decomposition and the like does not exist. Therefore, ammonia is used as a raw material gas source for hydrogen storage-hydrogen production and a promising and new attractive technical form.

However, the most common methods for producing hydrogen on site currently include water electrolysis hydrogen production, natural gas reforming hydrogen production, methane and ammonia cracking hydrogen production, and the like. A considerable proportion of the foreign hydrogen stations use the electrolytic water to produce hydrogen, although the raw materials are most easily obtained, the main cost is the electricity and the current density of an electrolytic cell to determine the hydrogen production rate, at present, each cubic hydrogen (0.089kg) needs to consume 5 kilowatts of electricity, the unit mass hydrogen storage amount of water is only 11.1 percent, and the hydrogen production purity is high, but the economy and the rationality need to be comprehensively considered. The natural gas reforming and methane cracking hydrogen production are not suitable for on-site operation due to the fact that the byproducts can generate CO and CO2, and the related processes have more capture processes, and the hydrogen carrying content of the natural gas and the methane is not higher than 17.6% and not higher than 12.4% of ammonia. In view of the fact that the existing on-site hydrogen production technology focuses on the aspects of high energy consumption, high emission and the like, and the energy consumption and emission during hydrogen production-hydrogen storage are not offset by the energy efficiency during hydrogen utilization, a novel, compact and efficient on-site hydrogen production method and equipment are urgently needed.

SUMMERY OF THE UTILITY MODEL

According to the technical problems that the existing on-site hydrogen production technology has high energy consumption and high emission and the energy efficiency during hydrogen production-hydrogen storage does not offset the energy consumption emission during hydrogen production-hydrogen storage, the skid-mounted mobile on-site hydrogen production all-in-one machine is provided. The utility model discloses use hydrogen-rich thing liquid ammonia (unit mass hydrogen storage volume 17.6%) as storing hydrogen the carrier, through the liquid ammonia gasification with receiving, the ammonia preheats the heating, step such as catalytic decomposition and last hydrogen purification is played, and integrated a series of energy conversion processes, the hydrogen more than the purification rate 99.9% is made on the scene to the removal that can not only be effective economy, thereby utilize integrated integrative heat transfer equipment waste heat recovery to utilize and reduce the hydrogen manufacturing energy consumption, it is pollution-free to have still compromise waste gas simultaneously, compact structure is high-efficient, the occasion of hydrogenation station removal scene hydrogen manufacturing and relevant needs hydrogen energy has been satisfied.

The utility model discloses a technical means as follows:

a skid-mounted mobile on-site hydrogen production integrated machine comprises a gasifier, a drying filter, a preheating heater and an ammonia cracking hydrogen separation and purification unit which are sequentially communicated; a pressure regulating valve group is arranged between the gasifier and the drying filter; a liquid ammonia flow regulating valve bank is arranged at an ammonia gas inlet of the gasifier, and a hydrogen pressure regulating valve bank is arranged at a hydrogen gas outlet;

the preheating heater comprises a waste heat recovery part and a heating branch part, an ammonia gas inlet of the waste heat recovery part is communicated with the drying filter, the heating branch part is provided with a branch manifold, and a dry-burning heating wire is wound on the outer side of the branch manifold;

the ammonia pyrolysis hydrogen separation and purification unit comprises a hydrogen production part and a purification part; the hydrogen production part comprises an ammonia gas inlet manifold and a hydrogen gas outlet manifold, a catalyst is filled in the hydrogen production part, the ammonia gas inlet manifold is communicated with the flow dividing manifold, the hydrogen gas outlet manifold is communicated with the purification part, and a hydrogen permeable membrane is attached to the inner wall of the hydrogen gas outlet manifold; the hydrogen production part is also provided with a nitrogen outlet communicated with the waste heat recovery part; high-temperature nitrogen generated after the cracking reaction in the hydrogen production part is introduced into the waste heat recovery part through the nitrogen outlet to carry out waste heat recovery; the purification part is communicated with the gasifier, and is filled with a molecular sieve adsorbent for removing miscellaneous gas; the gasifier is used for recovering heat of the high-temperature hydrogen generated by the purified hydrogen production part, cooling the hydrogen and using the recovered heat for gasifying liquid ammonia;

the integrated machine is of an up-down structure, the ammonia flow regulating valve group, the gasifier, the pressure regulating valve group, the drying filter and the hydrogen pressure regulating valve group are positioned at the lower layer of the integrated machine, and the preheating heater and the ammonia cracking hydrogen separation and purification unit are positioned at the upper layer of the integrated machine; the outside of the all-in-one machine is separated from the outside by arranging a heat insulation plate, and the upper layer and the lower layer of the all-in-one machine are separated from each other by the heat insulation plate.

Further, the waste heat recovery part is a dividing wall type heat exchanger; the heating shunt part is made of heat-resistant steel.

Further, liquid ammonia flow control valves is low temperature corrosion-resistant valves, pressure regulating valves is the explosion-proof group of normal atmospheric temperature corrosion-resistant valve, hydrogen pressure regulating valves is explosion-proof valves, the reposition of redundant personnel manifold the ammonia entry manifold with hydrogen outlet manifold is high temperature heat-resisting steel.

Further, the gasifier is a plate-fin type, plate type, wound tube type or shell-and-tube type heat exchanger and is made of corrosion-resistant and explosion-proof materials.

Further, the catalyst is a metal-based ammonia decomposition catalyst; the hydrogen permeable membrane is a palladium-based alloy membrane; the molecular sieve adsorbent is crystalline aluminosilicate.

Compared with the prior art, the utility model has the advantages of it is following:

1. the utility model provides a sled dress formula removes on-spot hydrogen manufacturing all-in-one overcomes shortcomings such as present hydrogen, liquid hydrogen warehousing and transportation are with high costs, flammable easy explosion, the utility model discloses utilize the row's warehousing and transportation of carrying hydrogen raw materials liquid ammonia, reappear the sled dress integration equipment of field hydrogen manufacturing. In addition, the wide liquid ammonia obtaining path has low cost (3000 Rc/ton), the hydrogen content is 16.7 Rc/kg, and the hydrogen price of the current hydrogenation station is about 70 Rc/kg; the liquid ammonia has higher hydrogen storage capacity (17.6%) than other hydrogen carrying systems, and the volume energy density is 1.53 times of that of liquid hydrogen.

2. The utility model provides a sled dress formula removes on-spot hydrogen manufacturing all-in-one, the power consumption of whole process only lies in the ammonia and heats 650 ~ 700 ℃, compares in the equipment consumptive material of water electrolysis hydrogen manufacturing only to go out ammonia decomposition catalyst and electric heater unit more, has the small investment, does not have complicated devices such as electrolysis trough and oxygen collection, has advantages such as small, the energy consumption is low, efficient, economic nature is good.

3. The utility model provides a sled dress formula removes on-spot hydrogen manufacturing all-in-one, compact structure, area is little, for whole sled dress formula, the security is high, the overall process is the anaerobic carbon-free environment, equipment is worked under the ordinary pressure, can reach and remove on-the-spot quick hydrogen manufacturing, the manufacturing result only is hydrogen and nitrogen gas (normal atmospheric temperature nitrogen gas can directly discharge the atmosphere) and compares in electrolytic water hydrogen manufacturing (production oxygen) natural gas, reforming hydrogen manufacturing such as methyl alcohol (CO2 and other pollutants) is safe complete environmental protection and nonflammable easy explosion more.

To sum up, use the utility model discloses compact structure, safety ring protect high-efficient, economic performance is good. The method is suitable for rapidly moving on-site hydrogen production through skillfully designed waste heat recovery and upper and lower structural equipment layering and modular design. Therefore, the technical scheme of the utility model solves the problem that the energy efficiency when the existing on-site hydrogen production technology has high energy consumption, high emission and hydrogen consumption does not offset the energy consumption emission when hydrogen production-hydrogen storage.

Based on the above reason the utility model discloses can start at relevant hydrogenation station, for the chemical industry hydrogen system, the production of electron monocrystalline silicon non ferrous metal and fields such as hydrogen energy automobile, boats and ships extensively promote.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.

FIG. 1 is a schematic diagram of the structure and principle of the skid-mounted mobile field hydrogen production all-in-one machine of the utility model.

FIG. 2 is a flow chart of energy recycling in the skid-mounted mobile on-site hydrogen production all-in-one machine of the present invention.

Fig. 3 is a schematic diagram of the structure of the preheating heater of the present invention.

FIG. 4 is a schematic structural diagram of the separation and purification unit for ammonia cracking hydrogen of the present invention.

In the figure: 1. an ammonia flow regulating valve group; 2. a gasifier; 3. a pressure regulating valve group; 4. drying the filter; 5. preheating a heater; 51. an exhaust heat recovery unit; 52. a heating shunt part; 53. a manifold; 6. An ammonia cracking hydrogen separation and purification unit; 61. a hydrogen production section; 611. an ammonia gas inlet manifold; 612. a hydrogen gas outlet manifold; 613. a nitrogen outlet; 62. a purification section; 7. a hydrogen pressure regulating valve group.

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

Unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. Any specific values in all examples shown and discussed herein are to be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a contrary explanation, these orientation words do not indicate and imply that the device or element in question must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of the present invention: the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and if not stated otherwise, the terms have no special meaning, and therefore, the scope of the present invention should not be construed as being limited.

Example 1

As shown in figure 1, the utility model provides a skid-mounted mobile on-site hydrogen production integrated machine, which comprises a gasifier 2, a drying filter 4, a preheating heater 5 and an ammonia cracking hydrogen separation and purification unit 6 which are sequentially communicated; a pressure regulating valve group 3 is arranged between the gasifier 2 and the drying filter 4; a liquid ammonia flow regulating valve group 1 is arranged at an ammonia gas inlet of the gasifier 2, and a hydrogen pressure regulating valve group 7 is arranged at a hydrogen gas outlet; all the devices of the all-in-one machine are communicated through pipelines;

as shown in fig. 3, the preheating heater 5 includes a waste heat recovery part 51 and a heating split part 52, an ammonia gas inlet of the waste heat recovery part 51 is communicated with the drying filter 4, the waste heat recovery part 51 is used for recovering waste heat of high-temperature nitrogen gas generated after hydrogen production, and the recovered waste heat is used for preheating raw ammonia gas, so as to reduce subsequent electric heating power consumption;

the heating flow-splitting part 52 is provided with a flow-splitting manifold 53, the outer side of the flow-splitting manifold 53 is wound with a dry-heating electric heating wire for heating the raw ammonia gas to the reaction temperature, the preheated ammonia gas enters the flow-splitting manifold 53 and is divided into a plurality of strands, and the preheated ammonia gas is heated to the preset temperature of 650-700 ℃ and then is introduced into the ammonia gas cracking hydrogen separation and purification unit 6;

as shown in fig. 4, the ammonia pyrolysis hydrogen separation and purification unit 6 includes a hydrogen production section 61 and a purification section 62; the hydrogen production part 61 comprises an ammonia gas inlet manifold 611 and a hydrogen gas outlet manifold 612, a catalyst is filled in the hydrogen production part 61, the ammonia gas inlet manifold 611 is communicated with the flow dividing manifold 53, the hydrogen gas outlet manifold 612 is communicated with the purification part 62, a hydrogen permeable membrane is attached to the inner wall of the hydrogen gas outlet manifold 612, only hydrogen gas can enter the hydrogen gas outlet manifold 612, and then each strand of hydrogen gas attacks the purification part 62;

the hydrogen production section 61 is further provided with a nitrogen outlet 613 communicated with the waste heat recovery section 51; high-temperature nitrogen generated after the cracking reaction in the hydrogen production part 61 is introduced into the waste heat recovery part 51 through the nitrogen outlet 613 to recover waste heat; the purification part 62 is communicated with the gasifier 2, and the purification part 62 is filled with a molecular sieve adsorbent for removing miscellaneous gas; the gasifier 2 is used for recovering heat of the high-temperature hydrogen generated by the purified hydrogen production part 61, cooling the hydrogen and using the recovered heat for gasifying liquid ammonia, and the cooled hydrogen is subjected to pressure regulation by the hydrogen regulating valve group 7 and then is transported to a user on site through a corresponding pipeline for use;

the integrated machine is of an up-down structure, the ammonia flow regulating valve group 1, the gasifier 2, the pressure regulating valve group 3, the drying filter 4 and the hydrogen pressure regulating valve group 7 are positioned at the lower layer of the integrated machine, and the preheating heater 5 and the ammonia cracking hydrogen separation and purification unit 6 are positioned at the upper layer of the integrated machine; the outside of the all-in-one machine is separated from the outside by arranging a heat insulation plate, and the upper layer and the lower layer of the all-in-one machine are separated from each other by the heat insulation plate.

The working process of the integrated machine mainly comprises the processes of receiving liquid ammonia, gasifying, removing impurities, preheating and heating ammonia gas, performing catalytic cracking conversion to prepare hydrogen, separating and purifying, finally cooling hydrogen and the like, wherein the processes of gasifying and preheating liquid ammonia, cooling catalytic cracking waste gas and cooling hydrogen are integrally connected to perform energy recovery and reuse; firstly, inflow is regulated through the liquid ammonia flow regulating valve group 1 to regulate the supply flow of liquid ammonia, the liquid ammonia is gasified through the gasifier 2, and the pressure of equipment and the flow rate of ammonia in the integrated machine are regulated by the pressure regulating valve group 3; secondly, removing moisture and impurities in the raw ammonia gas through the drying filter 4, preheating the raw ammonia gas through a heating shunt part 52 of the preheating heater 5, dividing the raw ammonia gas into a plurality of streams of fluid through a shunt manifold 53, winding and arranging a serpentine dry-burning heating wire on the outer side of the shunt manifold 53, introducing the raw ammonia gas into the ammonia gas hydrogen cracking separation and purification unit 6 after the raw ammonia gas is heated to the temperature of 650-700 ℃ under the specified process condition, carrying out catalytic cracking on the raw ammonia gas into hydrogen gas and nitrogen gas in a hydrogen production part 61, wherein the waste nitrogen gas is converged through a nitrogen gas outlet and introduced into a waste heat recovery part 52 of the preheating heater 5 for energy recovery, and preheating and heating the ammonia gas introduced into the preheating heater 5 to enable the ammonia gas; finally, the hydrogen that hydrogen manufacturing portion 61 made passes through hydrogen outlet manifold 612 lets in purification portion 62 carry out molecular sieve swing adsorption in purification portion 62 and detach the micro miscellaneous gas, and the hydrogen after the purification lets in vaporizer 2 cools off the back process hydrogen pressure regulating valve group 7 pressure regulating is carried for the user, simultaneously vaporizer 2 carries out waste heat recovery for the liquid ammonia that lets in gasifies.

Preferably, the hydrogen production part comprises a shell-and-tube cracking separation device, an ammonia gas inlet manifold 611, a nitrogen gas outlet 613 and a hydrogen gas outlet manifold 612, the shell-and-tube cracking separation device is filled with a catalyst, one end of the ammonia gas inlet manifold 611 is communicated with the inside of the shell-and-tube cracking separation device, and the other end of the ammonia gas inlet manifold 611 is communicated with the flow dividing manifold 53; one end of the hydrogen outlet manifold 612 extends into the shell-and-tube cracking and separating device, and the other end is communicated with the purifying part 62; a hydrogen permeable membrane is attached to the inner wall of the hydrogen outlet manifold 612.

All-in-one, will liquid ammonia flow control valves 1 vaporizer 2 pressure regulating valves 3 drier-filter 4 preheat heater 5 ammonia catalytic cracking hydrogen separation purification unit 6 with hydrogen pressure regulating valves 7 all adopt the modularization set up in the all-in-one, make this equipment compacter.

Further, the heat insulation board is made of high-strength heat insulation materials, so that energy dissipation and heating loss can be prevented.

Further, the exhaust heat recovery unit 51 is a dividing wall type heat exchanger; the heating branch portion 52 is made of heat-resistant steel.

Further, liquid ammonia flow control valves 1 is low temperature corrosion-resistant valves, pressure regulating valves 3 is the explosion-proof group of normal atmospheric temperature corrosion-resistant valve, hydrogen pressure regulating valves 7 is explosion-proof valves, flow distribution manifold 53 ammonia entry manifold 611 with hydrogen outlet manifold 612 is high temperature heat-resistant steel.

Further, the gasifier 2 is a plate-fin, plate, wound tube or shell-and-tube heat exchanger and is made of corrosion-resistant and explosion-proof materials.

Further, the catalyst is a metal-based ammonia decomposition catalyst such as Ru, Ni and Fe and other compound components; the hydrogen permeable membrane is a palladium-based alloy membrane and other related hydrogen permeable membranes; the molecular sieve pressure swing adsorbent is a crystalline aluminosilicate and other related materials.

Further, in the ammonia catalytic cracking hydrogen separation and purification unit 6, during the ammonia catalytic cracking separation, hydrogen purification, waste gas heat recovery and hydrogen cooling processes, the reaction process of catalytically cracking ammonia into hydrogen and nitrogen by using the catalyst filled inside is as follows:

the process is endothermic expansion reaction, i.e. unit mole of ammonia gas is cracked into 75% of hydrogen and 25% of ammonia gas under the catalysis of a certain temperature and absorbs 47.3kJ of heat, so that the temperature is increased and the pressure is reduced to facilitate the dynamic decomposition of ammonia, and thus the cracking conversion rate of ammonia gas under normal pressure and about 650 ℃ can reach 99.9% under the help of a catalyst.

The skid-mounted mobile field hydrogen production all-in-one machine working process specifically comprises:

(1) liquid ammonia gasification preheating temperature rise process

Liquid ammonia is stored in the storage tank at about minus 33 ℃ under normal pressure, the liquid ammonia is communicated with the flow regulating valve group 1 through a low-temperature pipeline to regulate the flow of the liquid ammonia, and the consumption of the liquid ammonia is determined according to the hydrogen demand, namely the hydrogen storage amount per unit mass of 5.68kg of liquid ammonia required by 1kg of hydrogen generated by the integrated machine is 17.6%. Liquid ammonia with a certain flow regulated enters the gasifier 2 to absorb heat and gasify and then becomes ammonia, the pressure in the all-in-one machine system is regulated through the pressure regulating valve group 3, the general system operates under normal pressure, and the pressure does not exceed 5 bar. After removing trace moisture and impurities from the gasified ammonia gas through a drying filter 4, preheating the gasified ammonia gas sequentially through a preheating heater 5, heating the gasified ammonia gas by a dry-burning heating pipe, raising the temperature to the catalytic cracking temperature of 650-.

(2) Process for separating and purifying hydrogen from ammonia by catalytic cracking

The raw material gas ammonia gas under the reaction temperature enters a catalytic cracking hydrogen production separation unit 6 and is decomposed into hydrogen and nitrogen by a catalyst; in order to increase the reaction area and reduce the catalyst poisoning failure phenomenon, the ammonia cracking hydrogen separation unit 6 receives each strand of raw material gas at the temperature to be reacted and carries out catalytic cracking in different shells filled with catalysts to form hydrogen and nitrogen, the hydrogen passes through a collecting pipe with a hydrogen permeable membrane palladium metal-based hydrogen permeable membrane open hole, and the hydrogen collected by each strand is converged at a manifold and then introduced into a molecular sieve for pressure swing adsorption to remove trace impurity gas.

(3) Integrated machine energy recycling process

As shown in fig. 2, the integrated machine of the present invention comprises two energy recycling processes, which are respectively: the decomposed high-temperature waste nitrogen gas is recycled to preheat the incoming flow of ammonia gas to be decomposed in the preheating heater 5, so that the power consumption of electric heating of subsequent equipment is saved; and the decomposed purified hydrogen with higher temperature is subjected to energy recovery to gasify the incoming liquid ammonia in the gasifier 2, and the purified hydrogen is recovered to the normal temperature state to prevent high temperature, flammability and explosiveness so as to be delivered to relevant field users.

Sled dress formula remove on-spot hydrogen manufacturing all-in-one, in order to increase reaction area, make the feed gas evenly reach reaction temperature and reduce catalyst poisoning inefficacy phenomenon, compare with prior art the utility model designs a unique ammonia heating, catalyst schizolysis hydrogen separation and purification unit, be divided into several after the raw materials gas ammonia after preheating gets into the manifold, every fluid pipe outside all twines snakelike dry combustion method heating wire, let in ammonia catalytic cracking hydrogen separation purification equipment 6 when waiting to react the feed gas and being heated to regulation process conditions temperature, every fluid gets into and carries out catalytic cracking to every ammonia in flowing in the decomposition unit of filling catalyst respectively for hydrogen and nitrogen gas in the different shells. After entering a collecting conduit with hydrogen permeable membrane openings in a pipe layer in the ammonia catalytic cracking hydrogen separation and purification equipment 6, each split stream of hydrogen is converged by an outlet manifold and flows into a molecular sieve pressure swing adsorption pipe, and then flows out after trace impurity gas is removed and purified.

In order to overcome the problem of energy consumption waste of heat exchange equipment and a heater, compared with the prior art that the heater is used in the gasification process in a system and cooling water circulation is used in the cooling process, the special design of the utility model is characterized in that two energy recovery processes are included, and the decomposed high-temperature waste gas nitrogen energy is respectively recovered to preheat the incoming flow of ammonia gas to be decomposed in the preheating heater 5, thereby saving the power consumption of electric heating of subsequent equipment; and (3) recovering energy of the decomposed purified hydrogen with higher temperature to enable the purified hydrogen to gasify the incoming liquid ammonia in the gasifier 2, and recovering the purified hydrogen to a normal temperature state to prevent high temperature, flammability and explosiveness so as to deliver the purified hydrogen to relevant field users.

Compared with other hydrogen production equipment, especially hydrogen production by electrolyzing water, the system of the utility model is more energy-saving and environment-friendly, and the power consumption parts of the equipment only adopt ammonia gas preheating heaters 5 and have no other power consumption equipment. And the heater works at full load only when the equipment is started, and the heater is changed into a low-load working mode or an intermittent working mode after the energy recovery process of the hydrogen production system starts to circulate.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present invention.

Claims (5)

1. A skid-mounted mobile on-site hydrogen production integrated machine is characterized by comprising a gasifier (2), a drying filter (4), a preheating heater (5) and an ammonia pyrolysis hydrogen separation and purification unit (6) which are communicated in sequence; a pressure regulating valve group (3) is arranged between the gasifier (2) and the drying filter (4); a liquid ammonia flow regulating valve group (1) is arranged at an ammonia gas inlet of the gasifier (2), and a hydrogen pressure regulating valve group (7) is arranged at a hydrogen gas outlet;

the preheating heater (5) comprises a waste heat recovery part (51) and a heating branch part (52), an ammonia gas inlet of the waste heat recovery part (51) is communicated with the drying filter (4), the heating branch part (52) is provided with a branch manifold (53), and the outer side of the branch manifold (53) is wound with a dry-burning electric heating wire;

the ammonia pyrolysis hydrogen separation and purification unit (6) comprises a hydrogen production part (61) and a purification part (62); the hydrogen production part (61) comprises an ammonia gas inlet manifold (611) and a hydrogen gas outlet manifold (612), the hydrogen production part (61) is filled with a catalyst, the ammonia gas inlet manifold (611) is communicated with the flow dividing manifold (53), the hydrogen gas outlet manifold (612) is communicated with the purification part (62), and a hydrogen permeable membrane is attached to the inner wall of the hydrogen gas outlet manifold (612); the hydrogen production part (61) is also provided with a nitrogen outlet (613) communicated with the waste heat recovery part (51); high-temperature nitrogen generated after the cracking reaction in the hydrogen production part (61) is introduced into the waste heat recovery part (51) through the nitrogen outlet (613) for waste heat recovery; the purification part (62) is communicated with the gasifier (2), and the purification part (62) is filled with a molecular sieve adsorbent and used for removing miscellaneous gas; the gasifier (2) is used for recovering heat of the high-temperature hydrogen generated by the purified hydrogen production part (61), cooling the hydrogen and using the recovered heat for gasifying liquid ammonia;

the integrated machine is of an up-down structure, the ammonia flow regulating valve group (1), the gasifier (2), the pressure regulating valve group (3), the drying filter (4) and the hydrogen pressure regulating valve group (7) are positioned at the lower layer of the integrated machine, and the preheating heater (5) and the ammonia cracking hydrogen separation and purification unit (6) are positioned at the upper layer of the integrated machine; the outside of the all-in-one machine is separated from the outside by arranging a heat insulation plate, and the upper layer and the lower layer of the all-in-one machine are separated from each other by the heat insulation plate.

2. The skid-mounted mobile integrated on-site hydrogen production machine according to claim 1, wherein the waste heat recovery part (51) is a dividing wall type heat exchanger; the heating shunt part (52) is made of heat-resistant steel.

3. The skid-mounted mobile on-site hydrogen production all-in-one machine according to claim 1, wherein the liquid ammonia flow regulating valve bank (1) is a low-temperature corrosion-resistant valve bank, the pressure regulating valve bank (3) is a normal-temperature corrosion-resistant valve explosion-proof bank, the hydrogen pressure regulating valve bank (7) is an explosion-proof valve bank, and the flow distribution manifold (53), the ammonia gas inlet manifold (611) and the hydrogen gas outlet manifold (612) are made of high-temperature heat-resistant steel.

4. The skid-mounted mobile integrated on-site hydrogen production machine according to claim 1, wherein the gasifier (2) is a plate-fin, plate, wound-tube or shell-and-tube heat exchanger and is made of a corrosion-resistant and explosion-proof material.

5. The skid-mounted mobile integrated on-site hydrogen production machine according to claim 1, wherein the catalyst is a metal-based ammonia decomposition catalyst; the hydrogen permeable membrane is a palladium-based alloy membrane; the molecular sieve adsorbent is crystalline aluminosilicate.

Images