CN116265381A - Coil pipe assembly, mixed gas preheating device and steam reforming hydrogen production reformer - Google Patents
Coil pipe assembly, mixed gas preheating device and steam reforming hydrogen production reformer Download PDFInfo
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- CN116265381A CN116265381A CN202211598832.9A CN202211598832A CN116265381A CN 116265381 A CN116265381 A CN 116265381A CN 202211598832 A CN202211598832 A CN 202211598832A CN 116265381 A CN116265381 A CN 116265381A
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- 239000007789 gas Substances 0.000 title claims abstract description 135
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 26
- 239000001257 hydrogen Substances 0.000 title claims abstract description 26
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 25
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 23
- 238000000629 steam reforming Methods 0.000 title claims abstract description 22
- 239000000203 mixture Substances 0.000 claims abstract description 84
- 239000000779 smoke Substances 0.000 claims description 67
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 34
- 239000003546 flue gas Substances 0.000 claims description 34
- 239000012530 fluid Substances 0.000 claims description 8
- 239000011810 insulating material Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 239000000446 fuel Substances 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 description 12
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 12
- 239000002994 raw material Substances 0.000 description 6
- 238000011144 upstream manufacturing Methods 0.000 description 6
- 239000003345 natural gas Substances 0.000 description 5
- 238000002407 reforming Methods 0.000 description 5
- 238000012546 transfer Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000003763 carbonization Methods 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000006057 reforming reaction Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
- C01B3/02—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen
- C01B3/32—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air
- C01B3/34—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air by reaction of hydrocarbons with gasifying agents
- C01B3/38—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air by reaction of hydrocarbons with gasifying agents using catalysts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/001—Extraction of waste gases, collection of fumes and hoods used therefor
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B2203/00—Integrated processes for the production of hydrogen or synthesis gas
- C01B2203/02—Processes for making hydrogen or synthesis gas
- C01B2203/0205—Processes for making hydrogen or synthesis gas containing a reforming step
- C01B2203/0227—Processes for making hydrogen or synthesis gas containing a reforming step containing a catalytic reforming step
- C01B2203/0233—Processes for making hydrogen or synthesis gas containing a reforming step containing a catalytic reforming step the reforming step being a steam reforming step
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B2203/00—Integrated processes for the production of hydrogen or synthesis gas
- C01B2203/08—Methods of heating or cooling
- C01B2203/0805—Methods of heating the process for making hydrogen or synthesis gas
- C01B2203/0833—Heating by indirect heat exchange with hot fluids, other than combustion gases, product gases or non-combustive exothermic reaction product gases
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B2203/00—Integrated processes for the production of hydrogen or synthesis gas
- C01B2203/12—Feeding the process for making hydrogen or synthesis gas
- C01B2203/1205—Composition of the feed
- C01B2203/1211—Organic compounds or organic mixtures used in the process for making hydrogen or synthesis gas
- C01B2203/1235—Hydrocarbons
- C01B2203/1241—Natural gas or methane
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B2203/00—Integrated processes for the production of hydrogen or synthesis gas
- C01B2203/12—Feeding the process for making hydrogen or synthesis gas
- C01B2203/1258—Pre-treatment of the feed
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Combustion & Propulsion (AREA)
- Inorganic Chemistry (AREA)
- Hydrogen, Water And Hydrids (AREA)
Abstract
The invention provides a coil assembly, a mixed gas preheating device comprising the coil assembly and a steam reforming hydrogen production reformer. The coil assembly has a mixture inlet, a mixture outlet, a first end, and a second end opposite the first end. The coil assembly comprises a first coil pipe section, a second coil pipe section and a hollow channel, wherein the first coil pipe section, the second coil pipe section and the hollow channel are formed by coiling a plurality of branch pipes; the coil assembly also includes an inlet junction tube and an outlet junction tube. The gas inlet converging pipe is provided with a mixed gas inlet, and the gas outlet converging pipe is provided with a mixed gas outlet. The inlet converging pipe is connected with the initial ends of the branch pipes in a split flow mode, and the outlet converging pipe is connected with the final ends of the branch pipes in a converging mode. The beginning and ending ends of the plurality of branches are adjacent to the first end. Wherein the second coiled tube section is formed inside the first coiled tube section, and the hollow passage is located inside the second coiled tube section and penetrates the first end to the second end. The coil pipe assembly can increase heat exchange area, improve heat exchange efficiency and reduce occupied space.
Description
Technical Field
The invention relates to the technical field of steam reforming hydrogen production, in particular to a coil assembly, a mixed gas preheating device with the coil assembly and a steam reforming hydrogen production reformer comprising the mixed gas preheating device.
Background
The steam reforming hydrogen production reforming device comprises a reformer and a mixed gas preheater, and the mixed gas is preheated by the mixed gas preheater before flowing into a reforming tube of the reformer.
In the conventional steam reforming hydrogen production conversion device, a mixed gas preheater is arranged outside a conversion furnace, and the mixed gas preheater preheats the mixed gas by utilizing the heat of high-temperature flue gas flowing out of the conversion furnace. The high-temperature flue gas flows out of the reformer and then enters the mixed gas preheater through a longer flue, so that the floor area is large, the heat dissipation capacity of the flue is large, and the heat loss is large.
Disclosure of Invention
The invention provides a coil assembly, a mixed gas preheating device comprising the coil assembly and a steam reforming hydrogen production reformer comprising the mixed gas preheating device, so as to reduce the occupied area of the steam reforming hydrogen production reformer and reduce heat loss.
In a first aspect, the present invention provides a coil assembly for providing a fluid path for a pre-heating process of a gas mixture in steam reforming hydrogen production. The coil assembly has a mixture inlet and a mixture outlet, the coil assembly having a first end and a second end opposite the first end. The coil assembly includes a first coiled tubing section, a second coiled tubing section, and a hollow passageway formed by coiling a plurality of branch tubes. The coil pipe assembly further comprises an air inlet converging pipe and an air outlet converging pipe, wherein the air inlet converging pipe is provided with a mixed gas inlet, and the air outlet converging pipe is provided with a mixed gas outlet. The inlet converging pipe is connected with the initial ends of the branch pipes in a split flow mode, and the outlet converging pipe is connected with the final ends of the branch pipes in a converging mode. The beginning and ending ends of the plurality of branches are adjacent the first end of the coil assembly. The first coiled pipe section is formed by spirally coiling and extending a plurality of branch pipes from the inlet converging pipe to the second end, and the second coiled pipe section is formed on the inner side of the first coiled pipe section by spirally coiling and extending a plurality of branch pipes from the second end to the outlet converging pipe. The hollow passage is located inside the second coiled tubing section and extends through the first end to the second end.
In some embodiments, the inlet merging pipe and the outlet merging pipe are each annular, and the plurality of branch pipes are connected to the inlet merging pipe and the outlet merging pipe at equal intervals in the circumferential direction.
Preferably, the plurality of branch pipes is configured as 6 branch pipes.
In a second aspect, the invention provides a mixed gas preheating device for preheating mixed gas through flue gas in steam reforming hydrogen production, which comprises an outer flue gas hood, the coil pipe assembly and an intermediate flue pipe. The outer petticoat pipe has bottom and top, and is equipped with inlet and outlet. The coil pipe subassembly is located the inside of outer petticoat pipe, and the first end of coil pipe subassembly is adjacent the bottom of outer petticoat pipe, and the second end of coil pipe subassembly is adjacent the top of outer petticoat pipe. The middle chimney is arranged between the first coiled pipe group section and the second coiled pipe group section, and extends along the direction from the first end to the second end of the coiled pipe assembly, so that the flow direction of smoke is limited to flow from the smoke inlet to the top of the outer smoke cover and then flow from the top of the outer smoke cover to the smoke outlet; wherein, advance the cigarette mouth and all locate the position adjacent the first end of coil pipe subassembly with the outlet flue.
In some embodiments, the gas mixture preheating device further comprises an inner chimney disposed in the hollow passage of the coil assembly and extending in a direction from the first end to the second end of the coil assembly such that a flue gas flow path from the top of the outer hood toward the outlet is defined between the intermediate chimney and the inner chimney.
Preferably, the side wall of the outer smoke cover is provided with a plurality of smoke inlets corresponding to the plurality of branch pipes at equal intervals in the circumferential direction, and each smoke inlet is staggered with the starting end of each branch pipe in the circumferential direction; the smoke outlet is arranged at the bottom of the outer smoke cover.
In some embodiments, the mixture preheating device further comprises a mixture inlet connection and a mixture outlet connection. The mixed gas inlet connecting end is communicated with a mixed gas inlet of the coil pipe assembly; the mixed gas outlet connection end is communicated to a mixed gas outlet of the coil pipe assembly. The mixed gas inlet connecting end and the mixed gas outlet connecting end are respectively arranged at the bottom of the outer smoke cover and extend to the outside of the outer smoke cover.
In some embodiments, a tube bundle fixing bracket is also provided in the outer smoke cage, the tube bundle fixing bracket fixing the coil assembly to the middle smoke tube.
Preferably, the outer smoke cover is provided with a layer of insulating material.
In a third aspect, the invention provides a steam reforming hydrogen production reformer, comprising the mixed gas preheating device, wherein the main body of the mixed gas preheating device is arranged below the inside of a reformer body, and a smoke inlet is arranged inside the reformer body; the mixed gas inlet connection end and the mixed gas outlet connection end extend to the outside of the furnace body; the smoke outlet is configured to be suitable for being communicated with a smoke exhaust barrel outside the bottom of the furnace body.
The invention has the characteristics and advantages that:
according to the coil pipe assembly provided by the invention, the first coil pipe section and the second coil pipe section are formed by coiling and extending the plurality of branch pipes, and the second coil pipe section is positioned at the inner side of the first coil pipe section, so that the path of the mixed gas flow channel can be prolonged, the heat exchange area is increased, and the heat exchange efficiency is improved under the condition that the height (pipe spacing of the coil pipe assembly) and the width (center circle diameter of the coil pipe assembly) of the coil pipe assembly are fixed. In other words, the height and width of the coil assembly can be substantially reduced with the mixture preheated to the same temperature. The volume of the mixed gas heat exchange device adopting the coil assembly can be satisfied to be placed into the existing reformer, thereby reducing the occupied area and heat loss.
According to the mixed gas preheating device provided by the invention, the flue gas flow and the mixed gas flow from bottom to top and then from top to bottom, and the flue gas flow and the mixed gas flow exchange heat in parallel, so that the cracking carbonization of a carbon-containing raw material (such as natural gas) in the mixed gas can be avoided.
According to the steam reforming hydrogen production reformer provided by the invention, the mixed gas preheating device is integrated in the steam reforming hydrogen production reformer, so that the internal space of a hearth is effectively utilized, the occupied area of the steam reforming hydrogen production reformer can be reduced, and flue gas directly enters the mixed gas preheating device from the inside of the furnace body, so that the heat loss can be reduced. Through set up the insulating material layer at the surface of gas mixture preheating device, the heat of flue gas can not be conducted to gas mixture preheating device in through gas mixture preheating device's main part, can avoid influencing the heat transfer efficiency of flue gas to the transfer pipe in the furnace. The gas mixture preheating device can be detachably installed and fixed from the bottom of the reformer, that is, a space for detachably extracting the gas mixture preheating device is reserved at the bottom of the reformer, so that maintenance or replacement of the gas mixture preheating device can be realized without affecting the whole furnace body.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a schematic diagram of a steam reforming hydrogen production reformer of the present invention;
FIG. 2A is a schematic diagram of an embodiment of a gas mixture preheating device according to the present invention;
FIG. 2B is a schematic view of the structure of FIG. 2A taken along the direction A-A;
FIG. 3A is a schematic diagram of one embodiment of a coil assembly of the present invention;
fig. 3B is a schematic perspective view of one of the legs of the coil assembly.
Detailed Description
The following description of the technical solutions in the embodiments of the present disclosure will be made clearly and completely with reference to the accompanying drawings in the embodiments of the present disclosure, and it is apparent that the described embodiments are only some embodiments of the present disclosure, not all embodiments. Based on the embodiments in this disclosure, all other embodiments that a person of ordinary skill in the art would obtain without making any inventive effort are within the scope of protection of this disclosure.
Referring to FIG. 1, a steam reforming hydrogen generation reformer 30, such as a natural gas reforming hydrogen generation reformer, is disclosed that reforms a feed gas mixture (mixture of natural gas and steam) to produce a reformed gas (mixture of methane, hydrogen, CO2, and H2O). A main burner 33 and a conversion pipe 34 are arranged in the conversion furnace 30, the top end of the conversion pipe 34 extends above the top of the furnace body of the conversion furnace 30, and a mixed gas inlet port is arranged at the top end of the conversion pipe 34; the bottom end of the conversion pipe 34 extends to the lower part of the bottom of the furnace body of the conversion furnace 30, and the bottom end of the conversion pipe 34 is provided with a conversion gas outlet port. The reforming tube 34 is provided with a catalyst required for reforming reaction, and the high-temperature flue gas generated by the combustion of the burner 33 provides heat required for reforming reaction in the reforming tube 34.
According to some embodiments of the present disclosure, the reformer 30 includes the mixture preheating device 20, and the body of the mixture preheating device 20 is provided below the inside of the furnace body of the reformer 30. The mixed gas preheating device 20 preheats the raw gas mixture from 200-300 ℃ to 500-600 ℃ by utilizing high-temperature flue gas in the furnace body. The mixture preheated by the mixture preheating device 20 is guided to the reformer tube 34 to undergo reforming reaction.
According to a specific embodiment of the present disclosure, referring to fig. 1 and 2A, the mixture preheating device 20 has a top and a bottom, the bottom of which is configured as a portion of the bottom of the reformer 30. The gas mixture preheating device 20 is provided with a smoke inlet 21a and a smoke outlet 21b, wherein the smoke inlet 21a is positioned in the furnace body and is close to the bottom of the gas mixture preheating device 20, the smoke outlet 21b is positioned at the bottom of the gas mixture preheating device 20, and the smoke outlet 21b is communicated with a smoke exhaust cylinder 32 outside the furnace body. The bottom of the mixed gas preheating device 20 is provided with a mixed gas inlet connection end 25 and a mixed gas outlet connection end 26, and the mixed gas inlet connection end 25 and the mixed gas outlet connection end 26 extend to the outside of the furnace body of the reformer 30. Raw material mixed gas with the temperature of 200-300 ℃ flows into the mixed gas preheating device 20 from the mixed gas inlet connecting end 25, and after the raw material mixed gas absorbs the heat of flue gas in the mixed gas preheating device 20, the raw material mixed gas with the temperature of 500-600 ℃ flows out of the mixed gas preheating device 20 from the mixed gas outlet connecting end 26. Preferably, the outer surface of the mixture preheating device 20 is provided with a layer of heat insulating material 21c, for example, an amorphous refractory heat insulating material such as ceramic fiber plastic.
According to the invention, the mixed gas preheating device is arranged in the hearth of the reformer, so that the space in the hearth is effectively utilized. If the mixed gas preheating device is arranged outside the hearth, the flue gas flowing out of the reformer needs to be guided to the mixed gas preheating device through the smoke discharging tube, and as a certain distance is reserved between the reformer and the mixed gas preheating device, the smoke discharging tube is arranged outside the reformer, more heat can be lost in the process that the flue gas flows through the smoke discharging tube. Therefore, compared with the arrangement of the mixed gas preheating device outside the hearth, the invention can not only reduce the occupied area of the whole device, but also reduce the heat loss of the system. In addition, through setting up the insulating material layer at the gas mixture preheating device surface, the heat of flue gas can not be through gas mixture preheating device's shell conduction to gas mixture preheating device in, can avoid influencing the heat transfer efficiency of flue gas to the transfer pipe in the furnace. In a word, the invention realizes the beneficial effects of compact arrangement and energy saving of the reformer and the mixed gas preheating device.
According to some embodiments of the present invention, the gas mixture preheating device may be detachably installed and fixed from the bottom of the reformer, i.e., a space for detachably drawing out the gas mixture preheating device is reserved at the bottom of the reformer, so that maintenance or replacement of the gas mixture preheating device may be achieved without affecting the entire furnace body.
Referring to fig. 2A, in some embodiments, the mixture preheating device 20 includes an outer smoke cage 21, an intermediate smoke stack 22, and a coil assembly 10. Wherein the intermediate chimney 22 and the coil assembly 10 are both disposed inside the outer smoke cage 21. The hood 21 has a top and a bottom that can serve as the top and bottom of the mixture preheating device 20. A heat insulating material layer 21c of the outer surface of the air-fuel mixture preheating device 20 may be provided to the hood 21. The lower part of the side wall of the outer hood 21 may be provided with a smoke inlet 21a, and the bottom of the outer hood 21 may be provided with a smoke outlet 21b.
The coil assembly 10 is adapted to provide a fluid path for the mixture, and the coil assembly 10 is in communication with the mixture inlet connection 25 in the upstream direction and the mixture outlet connection 26 in the downstream direction. The coil assembly 10 has a first end 10a and a second end 10b opposite the first end, the first end 10a being adjacent the bottom of the hood 21 and the second end 10b being adjacent the top of the hood 21. The coil assembly 10 has an upstream flow path (upstream section) of the mixture in a direction from the bottom to the top of the outer hood 21 and a downstream flow path (downstream section) of the mixture in a direction from the top to the bottom of the outer hood 21.
Referring to fig. 2A and 2B, an intermediate chimney 22 is provided between the mixture up-flow passage and the mixture down-flow passage of the coil assembly 10 and extends in the bottom-to-top direction of the outer hood 21. The middle chimney 22 is arranged such that the flow channel of the flue gas flow 50 in the mixed gas preheating device 20 is divided into an outer flow channel 51 and an inner flow channel 52, wherein the outer flow channel 51 is positioned between the outer smoke cover 21 and the middle chimney 22, and the inner flow channel 52 is positioned at the inner side of the middle chimney 22. The flow direction of the smoke is defined as flowing from the smoke inlet 21a to the top of the outer hood 21 (upper stage) along the outer flow path 51 and then from the top of the outer hood 21 to the smoke outlet 21b along the inner flow path 52 (lower stage).
With continued reference to fig. 2A and 2B, in some embodiments, the middle portion of the coil assembly 10 has a hollow passage 15 extending through the first end 10a to the second end 10B, with an inner chimney 24 disposed in the hollow passage 15. The inner chimney 24 extends in the direction of the first end 10a to the second end 10b of the coil assembly 10. The mixed gas preheating device 20 is provided with an inner chimney 24, and an inner flow passage 52 of a flue gas flow 50 is positioned between the inner chimney 24 and the middle chimney 22. The arrangement of the inner chimney 24 concentrates the heat of the flue gas in the inner flow passage 52 (downstream section) around the downstream flow passage of the mixture gas in the coil assembly 10, and improves the heat exchange effect of the flue gas in the downstream section and the mixture gas in the downstream section.
Referring to fig. 3A and 3B, some specific embodiments of the coil assembly 10 of the present invention are described in detail below.
The coil assembly 10 of the present invention is used to provide a fluid path for a mixture preheating process in steam reforming hydrogen production, and has a mixture inlet 111 and a mixture outlet 121. The coil assembly 10 has a first end 10a and a second end 10b opposite the first end 10a, the first end 10a being adapted to be disposed proximate to the bottom of the aforementioned hood 21 and the second end 10b being adapted to be disposed proximate to the top of the aforementioned hood 21.
Specifically, the coil assembly 10 includes an inlet merging pipe 11 and an outlet merging pipe 12, a mixture inlet 111 is provided at the inlet merging pipe 11, and a mixture outlet 121 is provided at the outlet merging pipe 12. The inlet merging pipe 11 is connected to the start ends 14a of the plurality of branch pipes 14 in a split manner, and the outlet merging pipe 12 is connected to the end ends 14b of the plurality of branch pipes 14 in a merged manner. The initial ends 14a and the final ends 14b of the plurality of branches 14 are each adjacent the first end 10a of the coil assembly 10, i.e., adjacent the bottom of the aforementioned hood 21.
In particular, referring to fig. 3B, each branch tube 14 is spirally wound up from a start end 14a and then spirally wound down to a final end 14B, the spirally wound up tube sections forming a first coiled tube section, and the spirally wound down tube sections forming a second coiled tube section. The first coiled tube section is in flow communication with a second coiled tube section, the second coiled tube section is positioned on the inner side of the first coiled tube section, and a hollow channel is formed on the inner side of the second coiled tube section. Referring to fig. 3A, the coil assembly 10 includes a first coiled tube group section 13A and a second coiled tube group section 13b formed by integrally coiling a plurality of branch tubes in parallel. Wherein, the integral parallel coiling means that a plurality of branch pipes 14 are parallel side by side and revolve around the same axis with the same radius. Preferably, the axis of the first coiled tubing section 13a coincides with the axis of the second coiled tubing section 13b. The first coiled tube group section 13a is formed by spirally coiling the plurality of branch tubes 14 from the inlet merging tube 11 toward the second end 10b, and the second coiled tube group section 13b is formed inside the first coiled tube group section 13a by spirally coiling the plurality of branch tubes 14 from the second end 10b toward the outlet merging tube 12. The first coiled tube section 13a provides an upward flow path for the mixture in the direction from the bottom to the top of the hood 21 and the second coiled tube section 13b provides a downward flow path for the mixture in the direction from the top to the bottom of the hood 21.
In some embodiments, a hollow passage 15 is formed between the first end 10a and the second end 10b on the inside of the second coiled tubing set section 13b. In some embodiments, there is a longitudinal distance between the inlet merging pipe 11 and the outlet merging pipe 12 such that, in the aforementioned mixture preheating device 20, the outlet merging pipe 12 is located below the inlet merging pipe 11.
In the preferred embodiment, the inlet merging pipe 11 and the outlet merging pipe 12 are each annular, and the plurality of branch pipes 14 are connected to the inlet merging pipe 11 and the outlet merging pipe 12 at circumferentially equal intervals. In general, a suitable number of the smoke inlets 21a and the branch pipes 14 may be provided according to the hydrogen production scale of the hydrogen production reformer, and for example, 2 to 8 may be provided, respectively. In particular, referring to FIG. 2B, the coil assembly 10 is provided with six legs 14. Correspondingly, in some preferred embodiments, referring to fig. 2B, in the air-fuel mixture preheating device 20, six smoke inlets 21a corresponding to the number of branch pipes 14 in the coil assembly 10 are circumferentially equally spaced below the side wall of the outer smoke cage 21, each smoke inlet 21a being disposed offset from the starting end 14a of each branch pipe 14 in a circumferential position. Further, referring also to fig. 2A, a plurality of smoke inlets 21a are provided above the inlet merging pipe 11 and the outlet merging pipe 12 in the longitudinal direction.
In accordance with the coil assembly 10 of the present invention, referring to fig. 3A, a plurality of branch tubes 14 may extend in a generally side-by-side relationship from the inlet header 11 to the second end 10b in a clockwise spiral to form a first coiled tube set segment 13A, and then continue in a generally side-by-side relationship to extend in a clockwise spiral from the second end 10b to the outlet header 12 to form a second coiled tube set segment 13b. Alternatively, in accordance with the coil assembly 10 of the present invention, a plurality of branch tubes 14 may also extend in a generally side-by-side relationship from the inlet junction tube 11 in a spiral manner in a counter-clockwise direction to the second end 10b to form a first coiled tube set segment 13a, and then continue in a generally side-by-side relationship from the second end 10b in a spiral manner in a counter-clockwise direction to the outlet junction tube 12 to form a second coiled tube set segment 13b.
The coil assembly 10 is used to provide an upstream mixed gas fluid path (first coiled tubing section 13 a) and a downstream mixed gas fluid path (second coiled tubing section 13 b) for a mixed gas preheating process in steam reforming hydrogen production. Because the first coiled pipe section 13a and the second coiled pipe section 13b are integrally formed by the plurality of branch pipes 14 in parallel and spiraling, and the second coiled pipe section 13b is positioned on the inner side of the first coiled pipe section 13, under the condition that the height (pipe spacing of the coil assembly 10) and the width (center circle diameter of the coil assembly) of the coil assembly 10 are fixed, the path of the mixed gas flow channel can be prolonged, the heat exchange area is increased, and the heat exchange efficiency is improved. In other words, the height and width of the coil assembly 10 can be substantially reduced with the mixture pre-heat elevated to the same temperature. The volume of the mixed gas heat exchange device adopting the coil pipe assembly can be satisfied to be placed into the existing reformer.
Alternatively, in other embodiments, the plurality of branch pipes 14 are independently rotated upward from the inlet junction pipe 11 to the second ends 10b about different axes, respectively, and are then independently rotated downward from the second ends 10b to the outlet junction pipe 12 about different axes, respectively, wherein the axis of rotation of the first coiled pipe section of each branch pipe 14 is not coincident with the axis of rotation of the second coiled pipe section. The first coiled tube section of the plurality of branch tubes forms a first coiled tube section 13a and the second coiled tube section of the plurality of branch tubes forms a second coiled tube section 13b.
It should be noted that, although the present invention uses the gas mixture as the preheating medium in the coil assembly, the gas mixture medium itself should not limit the protection scope of the structural configuration of the coil assembly, and the coil assembly of the present invention is equally considered as the protection scope of the present invention for providing the fluid channel for other fluid media requiring temperature increase.
With continued reference to the mixture preheating device 20 shown in fig. 2A, the smoke inlet 21a, the smoke outlet 21b, the mixture inlet 111, and the mixture outlet 121 are all disposed adjacent to the bottom of the device. The coil assembly 10 is disposed inside the hood 21, the coil assembly 10 including an ascending first coiled tube section 13a and a descending second coiled tube section 13b. The first coiled tubing section 13a provides a coiled upward flow path for the mixture, and the second coiled tubing section 13b provides a coiled downward flow path for the mixture. An intermediate chimney 22 is disposed between the first coiled tube section 13a and the second coiled tube section 13b, the intermediate chimney 22 extending in a direction from the first end 10a to the second end 10b of the coil assembly 10. In the transverse (radial) direction, a distance d1 is provided between the outer smoke cover 21 and the first coiled pipe section 13a, a distance d2 is provided between the middle smoke tube 22 and the first coiled pipe section 13a, a distance d3 is provided between the middle smoke tube 22 and the second coiled pipe section 13b, and the flow rate range of smoke is 8-25 m/s by setting a proper distance value. By arranging the flue gas guide cylinder (such as the middle flue pipe 22) in the mixed gas preheating device 20, the flue gas flow 50 and the mixed gas flow 40 can flow from bottom to top and then from top to bottom, so that the effect of enabling the flue gas flow 50 and the mixed gas flow 40 to flow in parallel and exchange heat is achieved, and cracking and carbonization of carbon-containing raw materials (such as natural gas) in the mixed gas can be avoided.
In some preferred embodiments, an inner chimney 24 is also provided in the hollow passage 15 inside the second coiled tubing section 13b of the coil assembly 10, the inner chimney 24 extending in a direction from the first end 10a to the second end 10b of the coil assembly 10. In the transverse (radial) direction, there is a spacing d4 between the second coiled tubing set section 13b and the inner chimney 24. When the radial dimension of the hollow passage 15 is larger, the inner chimney 24 is arranged, so that the smoke heat in the downstream heat exchange process can be gathered around the second coiled pipe group section 13b, and the heat exchange effect of the downstream section is improved.
Further, a first rib 22a is provided between the top of the inner chimney 24 and the top of the outer hood 21, and a second rib 22b is provided between the bottom of the inner chimney 24 and the bottom of the outer hood 21. The first rib plate and the second rib plate are arranged and used for supporting the inner chimney, so that the center of gravity of the inner chimney in the outer smoke cover is kept stable, and the whole mixed gas preheating device is firmer.
Referring to fig. 2A, the flow paths of the co-current upflow stage and co-current downflow stage flue gas stream 50 and the mixed gas stream 40, respectively, are described below.
Parallel flow uplink stage: the flue gas flow 50 enters the mixture preheating device 20 from the inlet 21a below the outer hood 21, and the flue gas flow 50 flows in the top direction in the space (the outer flow passage 51) defined between the intermediate chimney 22 and the outer hood 21. In correspondence with this process, the mixture gas flow 40 enters the mixture gas preheating device 20 from the mixture gas inlet connection end 25 at the bottom of the device, and the mixture gas flow 40 further flows from the mixture gas inlet 111 to the inlet merging pipe 11, is split by the inlet merging pipe 11 into the start end 14a of each branch pipe 14, and flows in the top direction spirally upward along the first coil group section 13a formed by coiling the respective branch pipe 14.
Parallel flow descending stage: after the flue gas flow 50 reaches the top, the direction of the deflection flows into the space (inner flow passage 52) defined inside the intermediate chimney 22, and continues to flow to the bottom, and finally, the flue gas flows to the outlet 21b at the bottom of the device. In response to this process, the mixed gas stream 40 reaches the second end 10b (adjacent the top) of the coil assembly 10, flows helically down the second coiled tube section 13b in the direction of the first end 10a (adjacent the bottom), merges into the outlet gas converging tube 12 from the terminal end 14b of each branch tube 14, and finally flows from the mixed gas outlet 121 of the outlet gas converging tube 12 to the mixed gas outlet connection 26 at the bottom of the device.
Referring to fig. 2A and 2B, in some preferred embodiments, a tube bundle fixing bracket 23 is further provided in the gas mixture preheating device 20, and the tube bundle fixing bracket 23 secures the coil assembly 10 in place within the outer hood 21, specifically, the tube bundle fixing bracket 23 secures the coil assembly 10 to the intermediate chimney 22. The first coiled tube group section 13a and the second coiled tube group section 13b are fixed to the intermediate chimney 22 by M tube bundle fixing brackets 23, respectively. Specifically, each tube bundle fixing bracket 23 includes N transverse brackets and 1 longitudinal bracket, the main body of the transverse brackets is V-shaped, the top end of the longitudinal bracket has a bending portion, the N transverse brackets divide the coiled tube group section into n+1 layers, the V-shaped opening ends of the transverse brackets are fixed to the middle chimney 22, and the longitudinal brackets are inserted into the V-shaped closed ends of each transverse bracket to connect the N transverse brackets into a whole. M, N may be an integer of 2 or more. In the embodiment shown in fig. 2A and 2B, m=3, n=6.
The mixed gas preheating device realizes the parallel flow heat exchange of the flue gas and the mixed gas, the temperature of the flue gas gradually decreases from the upstream direction to the downstream direction, and the temperature of the mixed gas gradually increases from the upstream direction to the downstream direction. On the basis of ensuring that both the mixed gas and the flue gas meet the requirement of an outlet temperature range, cracking carbonization of carbon-containing raw materials (such as natural gas) in the mixed gas can be avoided.
The foregoing is merely a few embodiments of the present disclosure, and those skilled in the art, based on the disclosure herein, may make various changes or modifications to the disclosed embodiments without departing from the spirit and scope of the disclosure.
Claims (10)
1. A coil assembly for providing a fluid path for a mixture preheating process in steam reforming hydrogen production, the coil assembly having a mixture inlet and a mixture outlet, the coil assembly having a first end and a second end opposite the first end, the coil assembly comprising:
a first coiled tube group section, a second coiled tube group section and a hollow passage formed by coiling a plurality of branch tubes; and
the gas inlet converging pipe is provided with the mixed gas inlet, and the gas outlet converging pipe is provided with the mixed gas outlet; the gas inlet converging pipe is connected with the initial ends of the plurality of branch pipes in a split flow mode, and the gas outlet converging pipe is connected with the final ends of the plurality of branch pipes in a converging mode; the start end and the end of the plurality of branch pipes are adjacent to the first end; wherein,,
the first coil group section is formed by spirally coiling and extending the plurality of branch pipes from the air inlet converging pipe to the second end; the second coiled pipe section is spirally coiled and extended from the second end to the outlet converging pipe by the plurality of branch pipes and is formed on the inner side of the first coiled pipe section; the hollow passage is located inside the second coiled tubing set section and extends through the first end to the second end.
2. The coil assembly of claim 1, wherein the inlet and outlet junction pipes are each annular, and the plurality of branch pipes are connected to the inlet and outlet junction pipes at circumferentially equidistant intervals.
3. The coil assembly of claim 2, wherein the plurality of legs is configured as 6 legs.
4. A mixed gas preheating device for preheating mixed gas through flue gas in steam reforming hydrogen production, characterized in that the mixed gas heat exchange device comprises:
the outer smoke cover is provided with a bottom and a top and is provided with a smoke inlet and a smoke outlet;
a coil assembly according to any one of claims 1 to 3, provided within the outer hood, the first end of the coil assembly being adjacent the bottom of the outer hood and the second end of the coil assembly being adjacent the top of the outer hood; and
an intermediate chimney disposed between the first coiled tube set section and the second coiled tube set section, the intermediate chimney extending in a direction from the first end to the second end of the coil assembly such that a flow direction of smoke is defined as flowing from the smoke inlet to the top of the outer smoke cage and then from the top of the outer smoke cage to the smoke outlet;
wherein, advance the mouth and the mouth all locates adjacent the position of the first end of coil pipe subassembly.
5. The gas-mixture preheating device according to claim 4, further comprising an inner chimney provided in the hollow passage of the coil assembly and extending in a direction from the first end to the second end of the coil assembly such that a flue gas flow path from the top of the outer hood toward the outlet is defined between the intermediate chimney and the inner chimney.
6. The air-fuel mixture preheating device according to claim 5, wherein a plurality of smoke inlets corresponding to the plurality of branch pipes are circumferentially and equidistantly arranged on the side wall of the outer smoke cover, and each smoke inlet is staggered with the starting end of each branch pipe in the circumferential position; the smoke outlet is arranged at the bottom of the outer smoke cover.
7. The air-fuel mixture preheating device according to claim 6, characterized in that the air-fuel mixture preheating device further comprises:
the mixed gas inlet connection end is communicated with a mixed gas inlet of the coil assembly; and
the mixed gas outlet connection end is communicated with a mixed gas outlet of the coil pipe assembly;
the gas mixture inlet connecting end and the gas mixture outlet connecting end are respectively arranged at the bottom of the outer smoke cover and extend to the outer part of the outer smoke cover.
8. The gas-mixture preheating device according to claim 7, wherein a tube bundle fixing bracket is further provided in the outer hood, and the tube bundle fixing bracket fixes the coil assembly to the intermediate chimney.
9. A gas mixture preheating device according to any one of claims 4 to 8, wherein the outer hood is provided with a layer of heat insulating material.
10. A steam reforming hydrogen production reformer, wherein said reformer includes a mixture preheating apparatus as defined in claim 9, wherein,
the main body of the mixed gas preheating device is arranged below the inside of the furnace body of the reformer, and the smoke inlet is arranged inside the furnace body;
the mixed gas inlet connection end and the mixed gas outlet connection end extend to the outside of the furnace body;
the smoke outlet is configured to be suitable for being communicated with a smoke exhaust barrel outside the bottom of the furnace body.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211598832.9A CN116265381B (en) | 2022-12-12 | 2022-12-12 | Coil pipe assembly, mixed gas preheating device and steam reforming hydrogen production reformer |
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| CN202211598832.9A CN116265381B (en) | 2022-12-12 | 2022-12-12 | Coil pipe assembly, mixed gas preheating device and steam reforming hydrogen production reformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117969217A (en) * | 2024-04-01 | 2024-05-03 | 上海轩鼎冶金科技集团有限公司 | Flue gas treatment system for detection and medicament life detection method |
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| Publication number | Publication date |
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| CN116265381B (en) | 2024-08-09 |
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