CN103438736B - Two-stage back heating multi-strand winding pipe type heat exchange device for low-temperature liquid nitrogen - Google Patents
Two-stage back heating multi-strand winding pipe type heat exchange device for low-temperature liquid nitrogen Download PDFInfo
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- CN103438736B CN103438736B CN201310361165.7A CN201310361165A CN103438736B CN 103438736 B CN103438736 B CN 103438736B CN 201310361165 A CN201310361165 A CN 201310361165A CN 103438736 B CN103438736 B CN 103438736B
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Abstract
The invention mainly relates to the technical field of synthesis ammonia and low-temperature liquid nitrogen, and relates to the technology of a two-stage back heating multi-strand winding pipe type heat exchange device for the low-temperature liquid nitrogen. Through N2-H2 synthesis gas which is in the outlet of a three-stage cooling device in the low-temperature liquid nitrogen process and synthesized by H2 at the temperature of 130.2 DEG C below zero and the pressure of 1.78MPa and N2 at the temperature of 130.2 DEG C below zero and the pressure of 5.14MPa and through waste nitrogen N2-Ar-CO-CH4 at the temperature of 130.2 DEG C below zero and the pressure of 0.15MPa, N2 at the temperature of 38 DEG C below zero and the pressure of 5.8MPa is cooled to be N2 at the temperature of 127.2 DEG C below zero and the pressure of 5.7MPa, and purified gas H2-N2-CO-Ar-CH4 washed by low-temperature methanol is cooled to be purified gas at the temperature of 127.2 DEG C below zero and the pressure of 5.24MPa, namely, the incoming high-pressure N2 and the purified gas washed by the low-temperature methanol are cooled through cooling capacity back heating of the N2-H2 synthesis gas of the outlet of the three-stage cooling device, high-pressure H2 and the waste nitrogen, and the temperature condition is provided for the three-stage cooling device. The two-stage back heating multi-strand winding pipe type heat exchange device for the low-temperature liquid nitrogen is compact in structure and high in heat exchange efficiency and can be used for solving the technical problems of the two-stage six-strand four-bundle winding pipe type heat exchange for the low-temperature liquid nitrogen with the temperature ranging from 38 DEG C below zero to 127.2 DEG C below zero, and the low-temperature heat exchange efficiency of a low-temperature liquid nitrogen process system is improved.
Description
Technical field
The present invention is mainly used in synthetic ammonia low-temperature liquid nitrogen process equipment technical field, relates to low temperature liquid nitrogen secondary six plume four and restrains spiral winding pipe type heat exchange equipment technology ,-130.2 DEG C, 1.78MPa H of three tier structure device for cooling outlet in application of cold temperature liquid nitrogen technique
2,-130.2 DEG C, 5.14MPa N
2-H
2synthesis gas and-130.2 DEG C, 0.15MPa N
2-A
r-CO-CH
4dirty nitrogen cooling-38 DEG C, 5.8MPa N
2to-127.2 DEG C, 5.7MPa and cooling be from-63.3 DEG C, 5.26MPa H of low-temp methanol technique
2-N
2-CO-A
r-CH
4purified gas, to-127.2 DEG C, 5.24MPa, namely applies the N of three tier structure device for cooling outlet
2-H
2synthesis gas, high pressure H
2and the cold backheat cooling incoming higher pressure N of dirty nitrogen
2, purified gas after low-temperature rectisol, provide temperature conditions to three tier structure device for cooling; Its compact conformation, heat exchange efficiency is high, can be used for-38 DEG C ~-127.2 DEG C gas band phase change cryogenic field of heat exchange, solves a low temperature liquid nitrogen two-stage system refrigeration technique difficult problem, improves the low temperature backheat heat exchange efficiency of low temperature liquid nitrogen process system.
Background technology
Main heat exchange equipment in synthetic ammonia low-temperature liquid nitrogen technique bag is multiple flow spiral winding tube type heat exchanger, main heat exchange technological process mainly comprises three phases, heat exchanger primarily of three various heat exchange warm areas forms, wherein, first stage be by compression after high pressure nitrogen carry out precooling, be chilled to-38 DEG C in advance by 42 DEG C of high pressure nitrogens; Second stage is that high pressure nitrogen is cooled to-63.6 DEG C from-38 DEG C, then is cooled to-127.2 DEG C, by H
2-N
2-CO-A
r-CH
4purified gas is cooled to-127.2 DEG C from-63.6 DEG C, is that three sections of refrigeration are prepared;-127.2 DEG C of high pressure nitrogens are cooled to-188 DEG C and liquefy and low-temp methanol technique is carried out-127.2 DEG C of purified gas and are cooled to-188.2 DEG C by three phases.Three processes can adopt various heat exchange equipment.First, low temperature liquid nitrogen is washed process system and is adopted overall heat exchange mode mostly at present, connected by three sections of process of refrigerastions is an entirety, heat exchanger height can reach 60 ~ 80 meters, heat exchange efficiency is improved significantly, but it is too complicated that Problems existing is heat-exchanging process flow process, heat transmission equipment volume is too huge, serious inconvenience is brought to processing and manufacturing, in-site installation and transport, and once there is the problems such as pipe leakage, be difficult to detect, easily cause whole heat exchanger to scrap, set technique equipment stops production, and the present invention solves LN from three-segment type heat exchange equipment
2precooling Liquefaction is started with, and emphasis solves the low-temperature heat exchange problem of two sections of refrigerating plants.Secondly, because common tubular heat exchanger adopts tube sheet to connect bundle of parallel tubes mode, structure is simple, and self-constriction ability is poor, and be generally the heat exchange of sub-thread stream, heat exchange efficiency is lower, and volume is comparatively large, and the temperature difference is less, is difficult to high pressure N
2cool in a flow process and liquefy, the present invention then adopts six plume four tube bank type spiral winding pipe type heat exchange equipments to carry out the intensive heat transfer process of multiple flow low temperature, can solve secondary refrigeration multiple flow low-temperature heat exchange problem, reduce heat exchanger quantity, improve heat exchange efficiency.In addition, because secondary refrigeration equipment heat exchange warm area is between-38 DEG C ~-130.2 DEG C, traditional expanded material heat-insulation layer is difficult to prevent cold transmission, leak heat serious, cause high pressure nitrogen to liquefy, the problems such as reflux fluid temperature is too high, and the present invention adopt vacuum multi-layer insulation technology, be wound around tubular type heat exchange characteristic in conjunction with multiple flow, can guarantee that secondary heat exchange process loss of refrigeration capacity is minimum.In addition, traditional nitrogen hydrogen Calculate Ways directly injects synthesis gas tube bank when being and the nitrogen that nitrogen gas generating system is produced is pressurized to 5.14MPa, after reaching the accurate trim of 1:3, proceed to one-level refrigerating plant, and finally meet the ratio of nitrogen hydrogen in synthetic ammonia, this method needs 5.14MPa supercharging nitrogen to supplement trim, needs to add multistage nitrogen compressor bank in addition.Owing to having the high pressure incoming flow nitrogen of 5.8MPa in two-stage system device for cooling, the present invention directly draws high pressure nitrogen bottom secondary heat exchanger shell-side, the tube bank of secondary synthesis gas is squeezed into after throttling to 5.14MPa, reach the object of accurate trim nitrogen hydrogen ratio, no longer increase nitrogen multi-stage compression system, cost-saving.Finally, stage casing purified gas inlet temperature is-63.3 DEG C, logarithmic mean temperature difference (LMTD) 3 DEG C, if set-63.3 DEG C for secondary refrigeration inlet temperature, then one-level refrigeration maximum temperature difference is 108.3 DEG C, and secondary refrigeration maximum temperature difference is 66.9 DEG C, the cold maximum temperature difference of three tier structure is 66.2 DEG C, three Temperature Difference Ratios comparatively after, because the one-level refrigeration temperature difference is comparatively large, cause one-level refrigerating plant compared with secondary and three grades of volumes large, heat exchange load is high, therefore, in order to appropriate design syllogic refrigerating plant, reasonable distribution heat transfer temperature difference is needed.According to the detailed computational process of heat exchange amount, distribute one-level refrigeration maximum temperature difference 83 DEG C, secondary refrigeration maximum temperature difference 89 DEG C, the cold maximum temperature difference of three tier structure 66.2 DEG C, three sections of heat exchanger profile sizes can be made so similar, be easy to processing and manufacturing, transport and installation and debugging, so two-stage system device for cooling adopts purified gas stage casing to squeeze into mode heat exchange.The present invention washes technology features and N according to low temperature liquid nitrogen
2secondary cryogenic refrigeration feature, adopt three grades of respective independently spiral winding tube type heat exchangers as main heat transmission equipment, segmentation independent cooling, emphasis is for the second level six plume four tube bank type spiral winding pipe type heat exchange refrigeration process flow process, the second level refrigeration process technology of research and development warm area between-38 DEG C ~-130.2 DEG C and be wound around pipe type heat transfer equipment, solves secondary high pressure N
2low temperature backheat and purified gas precooling Key technique problem, namely secondary six plume four restrains spiral winding pipe type heat exchange equipment technological process and structure problem.
Summary of the invention
The present invention is mainly for high pressure nitrogen two sections of-38 DEG C ~-127.2 DEG C low-temperature liquefaction problems, employing has six plumes four that volume is little, heat exchange efficiency is high, heat transfer temperature difference is large, have self-tightening contraction adjustment function and restrains spiral winding tube type heat exchanger as main heat exchange equipment, applies-130.2 DEG C, 1.78MPa H
2,-130.2 DEG C, 5.14MPa N
2-H
2mist and-130.2 DEG C, 0.15MPa N
2-A
r-CO-CH
4the technological process of mist backheat refrigeration, controls high pressure nitrogen and purified gas precooling temperature and pressure, improves heat exchange efficiency, solve high pressure nitrogen two grade low-temp backheat and purified gas precooling problem, for synthetic ammonia low-temperature liquid nitrogen three tier structure device for cooling provides pre-cool condition.
Technical solution of the present invention:
Low temperature liquid nitrogen is wound around pipe type heat transfer equipment with secondary backheat multiple flow, comprises secondary high pressure N
2entrance sleeve (1), secondary upper cover vacuum multilayer insulation layer (2), end socket (3) is pressed in secondary, the dirty nitrogen outlet tube sheet of secondary (4), the dirty nitrogen discharge connection of secondary (5), the dirty nitrogen outlet(discharge) flange of secondary (6), the dirty nitrogen outlet bobbin carriage of secondary (7), secondary external pressure upper shell (8), secondary dividing plate (9), secondary upper shell vacuum multilayer insulation layer (10), cylindrical shell (11) is pressed in secondary, secondary pearlife (12), external pressure heads in secondary (13), external pressure heads vacuum multilayer insulation layer (14) in secondary, press seal head (15) in secondary, secondary external pressure lower shell (16), bracing ring in secondary (17), secondary lower shell vacuum multilayer insulation layer (18), cylindrical shell (19) is depressed in secondary, secondary purification gas outlet tube sheet (20), secondary purification gas outlet bobbin carriage (21), secondary purification gas discharge connection (22), secondary purification gas outlet(discharge) flange (23), the dirty nitrogen inlet bobbin carriage of secondary (24), the dirty nitrogen inlet flange of secondary (25), the dirty nitrogen inlet adapter of secondary (26), the dirty nitrogen inlet tube sheet of secondary (27), the dirty nitrogen of secondary is wound around tube bank (28), secondary N
2-H
2synthesis gas winding tube bank (29), secondary essence are joined high pressure nitrogen outlet(discharge) flange (30), secondary essence is joined high pressure nitrogen discharge connection (31), secondary external pressure low head (32), secondary high pressure N
2discharge connection (33), secondary high pressure N
2end socket (36), secondary N is depressed in outlet(discharge) flange (34), secondary low head vacuum multilayer insulation layer (35), secondary
2-H
2synthesis gas suction flange (37), secondary N
2-H
2synthesis gas entrance sleeve (38), secondary N
2-H
2synthesis gas import bobbin carriage (39), secondary N
2-H
2synthesis gas import tube sheet (40), secondary H
2import bobbin carriage (41), secondary H
2suction flange (42),Secondary H
2Entrance sleeve (43), secondary H
2Import tube sheet (44), secondary H
2Be wound around bracing ring (56), secondary H on tube bank (45), secondary purification gas winding tube bank (46), secondary lower support circle (47), secondary tube bank demarcation strip (48), the outer coil pipe (49) of spiral, secondary purification gas import tube sheet (50), secondary purification gas import bobbin carriage (51), secondary purification gas entrance sleeve (52), secondary purification gas suction flange (53), spiral inner coil pipe (54), secondary center cylinder (55), secondary
2Outlet tube sheet (57), secondary H
2Outlet bobbin carriage (58), secondary H
2Discharge connection (59), secondary H
2Outlet(discharge) flange (60), secondary N
2-H
2Syngas outlet flange (61), secondary N
2-H
2Syngas outlet adapter (62), secondary N
2-H
2Syngas outlet bobbin carriage (63), secondary N
2-H
2Syngas outlet tube sheet (64), secondary external pressure upper cover (65), secondary high pressure N
2Suction flange (66), is characterized in that: the dirty nitrogen of secondary is wound around tube bank (28), secondary N
2-H
2Synthesis gas is wound around tube bank (29), secondary H
2Be wound around tube bank (45), be wound around around secondary center cylinder (55), after being wound around, form spiral inner coil pipe (54); Secondary purification gas is wound around tube bank (46) and is wound around around spiral inner coil pipe (54), the outer coil pipe (49) of spiral is formed after being wound around, the outer coil pipe (49) of spiral, lower than spiral inner coil pipe (54), is extracted out by heat exchanger stage casing; Spiral inner coil pipe (54) after winding is positioned at secondary and presses cylindrical shell (11) and secondary and depress cylindrical shell (19),The outer coil pipe (49) of spiral is positioned at secondary and depresses cylindrical shell (19); Bracing ring (56) on secondary is installed in secondary center cylinder (55) one end, secondary lower support circle (47) is installed in one end, bracing ring on secondary (56) is fixed on and in secondary, presses cylindrical shell (11) top, and secondary lower support circle (47) is fixed on depresses cylindrical shell (19) bottom in secondary; Bracing ring in secondary (17) is installed in spiral inner coil pipe (54) and secondary and depresses between cylindrical shell (19), and is positioned at secondary and depresses cylindrical shell (19) top; The dirty nitrogen of secondary is wound around tube bank (28), secondary N
2-H
2Synthesis gas is wound around tube bank (29), secondary H
2Be wound around tube bank (45) to be wound between bracing ring on secondary (56) and secondary lower support circle (47); Secondary purification gas is wound around tube bank (46) and is wound between bracing ring in secondary (17) and secondary lower support circle (47); In secondary, press cylindrical shell (11) top and in secondary, press end socket (3) and be connected, in secondary, press end socket (3) top secondary high pressure N is installed
2Entrance sleeve (1) and secondary high pressure N
2Suction flange (66); In secondary, press cylindrical shell (11) bottom to be connected with end socket (15) top in pressure in secondary, in end socket (15) bottom connection secondary, cylindrical shell (19) is depressed in pressing in secondary, in secondary, depress cylindrical shell (19) bottom and in secondary, depress end socket (36) and be connected, in secondary, depress end socket (36) top secondary high pressure N is installed
2Discharge connection (33) and secondary high pressure N
2Outlet(discharge) flange (34); In secondary, press cylindrical shell (11) upper left-hand the dirty nitrogen outlet tube sheet of secondary (4) is installed, the dirty nitrogen outlet tube sheet of secondary (4) the left side connection dirty nitrogen outlet bobbin carriage of secondary (7), the dirty nitrogen outlet(discharge) flange of dirty nitrogen outlet bobbin carriage (7) the top connection dirty nitrogen discharge connection of secondary of secondary (5) and secondary (6); In the middle of pressing cylindrical shell (11) top in secondary, secondary N is installed
2-H
2Syngas outlet tube sheet (64), secondary N
2-H
2Syngas outlet tube sheet (64) is connection secondary N above
2-H
2Syngas outlet bobbin carriage (63), secondary N
2-H
2Syngas outlet bobbin carriage (63) top connection secondary N
2-H
2Syngas outlet adapter (62) and secondary N
2-H
2Syngas outlet flange (61); In secondary, press cylindrical shell (11) upper right secondary H is installed
2Outlet tube sheet (57), secondary H
2Outlet tube sheet (57) right side connection secondary H
2Outlet bobbin carriage (58), secondary H
2Outlet bobbin carriage (58) top connection secondary H
2Discharge connection (59) and secondary H
2Outlet(discharge) flange (60); In secondary, depress cylindrical shell (19) upper right secondary purification gas import tube sheet (50) is installed, secondary purification gas import tube sheet (50) left side connection secondary purification gas import bobbin carriage (51), secondary purification gas import bobbin carriage (51) top connection secondary purification gas entrance sleeve (52) and secondary purification gas suction flange (53); In secondary, depress cylindrical shell (19) lower left side secondary purification gas outlet tube sheet (20) is installed, secondary purification gas outlet tube sheet (20) left side connection secondary purification gas outlet bobbin carriage (21), secondary purification gas outlet bobbin carriage (21) top connection secondary purification gas discharge connection (22) and secondary purification gas suction flange (23); In the middle of depressing cylindrical shell (19) bottom in secondary, secondary N is installed
2-H
2Synthesis gas import tube sheet (40), secondary N
2-H
2Synthesis gas import tube sheet (40) is connection secondary N above
2-H
2Synthesis gas import bobbin carriage (39), secondary N
2-H
2Synthesis gas import bobbin carriage (39) top connection secondary N
2-H
2synthesis gas entrance sleeve (38) and secondary N
2-H
2synthesis gas suction flange (37), in secondary, depress cylindrical shell (19) lower left side the dirty nitrogen inlet tube sheet of secondary (27) is installed, the dirty nitrogen inlet tube sheet of secondary (27) the left side connection dirty nitrogen inlet bobbin carriage of secondary (24), the dirty nitrogen inlet flange of secondary dirty nitrogen inlet bobbin carriage (24) the top connection dirty nitrogen inlet adapter of secondary (26) and secondary (25), in secondary, depress cylindrical shell (19) right side, bottom secondary H is installed
2import tube sheet (44), secondary H
2import tube sheet (44) right side connection secondary H
2import bobbin carriage (41), secondary H
2import bobbin carriage (41) top connection secondary H
2entrance sleeve (43) and secondary H
2suction flange (42), in secondary, depress and install that secondary essence is joined high pressure nitrogen discharge connection (31), secondary essence is joined high pressure nitrogen outlet(discharge) flange (30) in the middle of cylindrical shell (19) bottom, end socket (3) is pressed in secondary, cylindrical shell (11) is pressed in secondary, end socket (15) in pressing in secondary, cylindrical shell (19) is depressed in secondary, in secondary, depress end socket (36) outer surface and alternately wrap up respectively the secondary upper cover vacuum multilayer insulation layer (2) being formed by multilayer heat insulation paper and laminated aluminium foil, secondary upper shell vacuum multilayer insulation layer (10), external pressure heads vacuum multilayer insulation layer (14) in secondary, secondary lower shell vacuum multilayer insulation layer (18), secondary low head vacuum multilayer insulation layer (35), external pressure heads (13), secondary external pressure lower shell (16), secondary external pressure low head (32) in secondary external pressure upper cover (65), secondary external pressure upper shell (8), secondary outside external pressure heads vacuum multilayer insulation layer (14), secondary lower shell vacuum multilayer insulation layer (18), secondary low head vacuum multilayer insulation layer (35), is respectively in secondary upper cover vacuum multilayer insulation layer (2), secondary upper shell vacuum multilayer insulation layer (10), secondary, secondary pearlife (12) is filled in vacuum heat-insulating layer, secondary external pressure upper shell (8) top penetrates installs the dirty nitrogen discharge connection of secondary (5), secondary N
2-H
2syngas outlet adapter (62), secondary H
2discharge connection (59),Secondary external pressure lower shell (16) top penetrates installs secondary purification gas entrance sleeve (52), and bottom penetrates installs secondary purification gas discharge connection (22), the dirty nitrogen inlet adapter of secondary (26), secondary H
2Entrance sleeve (43), secondary N
2-H
2Synthesis gas entrance sleeve (38), secondary essence are joined high pressure nitrogen discharge connection (31); Secondary external pressure upper cover (65) middle part penetrates installs secondary high pressure N
2Entrance sleeve (1); Secondary external pressure low head (32) middle part penetrates installs secondary high pressure N
2Discharge connection (33).
H
2-130.2 DEG C, 1.78MPa time enter secondary H
2import bobbin carriage (41), at secondary H
2import bobbin carriage is allocated in secondary H in (41)
2be wound around tube bank (45) each arm, secondary H
2be wound around tube bank (45) to depress in secondary after spiral winding in cylindrical shell (19) and secondary and press in cylindrical shell (11) by from secondary high pressure N
2the shell side high pressure N of entrance sleeve (1)
2heating, temperature is increased to-41 DEG C, Pressure Drop is low to moderate 1.76MPa, then flow to secondary H
2outlet bobbin carriage (58), then through secondary H
2discharge connection (59) flows out into one-level refrigerating plant.
N
2-H
2synthesis gas-130.2 DEG C, 5.14MPa time enter secondary N
2-H
2synthesis gas import bobbin carriage (39), at secondary N
2-H
2secondary N is allocated in synthesis gas import bobbin carriage (39)
2-H
2synthesis gas is wound around tube bank (29) each arm, secondary N
2-H
2synthesis gas is wound around tube bank (29) and depresses in secondary after spiral winding in cylindrical shell (19) and secondary and press in cylindrical shell (11) by from secondary high pressure N
2the shell side high pressure N of entrance sleeve (1)
2heating, temperature is increased to-41 DEG C, Pressure Drop is low to moderate 5.09MPa, then flow to secondary N
2-H
2syngas outlet bobbin carriage (63), then through secondary N
2-H
2syngas outlet adapter (62) flows out into one-level refrigerating plant.
N
2-A
r-CO-CH
4dirty nitrogen-130.2 DEG C, 0.15MPa time enter dirty nitrogen inlet bobbin carriage (24) of secondary, in dirty nitrogen inlet bobbin carriage (24) of secondary, be allocated in the dirty nitrogen of secondary be wound around tube bank (28) each arm, the dirty nitrogen of secondary is wound around tube bank (28) and depresses in secondary after spiral winding in cylindrical shell (19) and secondary and press in cylindrical shell (11) by from secondary high pressure N
2the shell side high pressure N of entrance sleeve (1)
2heating, temperature is increased to-41 DEG C, Pressure Drop is low to moderate 0.12MPa, then flow to dirty nitrogen outlet bobbin carriage (7) of secondary, then flows out into one-level refrigerating plant through dirty nitrogen discharge connection (5) of secondary.
H
2-N
2-CO-A
r-CH
4purified gas-63.3 DEG C, 5.26MPa time enter secondary purification gas import bobbin carriage (51), in secondary purification gas import bobbin carriage (51), be allocated in secondary purification gas be wound around tube bank (46) each arm, secondary purification gas is wound around tube bank (46) and depresses in secondary after spiral winding in cylindrical shell (19) by-130.2 DEG C, 1.78MPa H
2,-130.2 DEG C, 5.14MPa N
2-H
2synthesis gas and-130.2 DEG C, 0.15MPa N
2-A
r-CO-CH
4dirty nitrogen is cooled to-127.2 DEG C, 5.24MPa, then flow to secondary purification gas outlet bobbin carriage (21), then flows out into three tier structure device for cooling through secondary purification gas discharge connection (22).
High pressure N
2-38 DEG C, 5.8MPa time through secondary high pressure N
2entrance sleeve (1) enters housing, is wound around dirty nitrogen, secondary N in tube bank (28) by the dirty nitrogen of secondary
2-H
2synthesis gas is wound around tube bank (29) interior synthesis gas, secondary H
2be wound around tube bank (45) interior hydrogen_cooling to-127.2 DEG C, 5.7MPa N
2, through secondary high pressure N
2discharge connection (33) flows out into three tier structure device for cooling.
Essence joins high pressure N
2-127.2 DEG C, 5.7MPa time through secondary essence join high pressure nitrogen discharge connection (31) draw housing, squeeze into secondary N by connecting line
2-H
2synthesis gas import bobbin carriage (39) carries out N
2, H
2ratio 1:3 essence is joined, essence join after N
2-H
2synthesis gas enters secondary N
2-H
2synthesis gas is wound around tube bank (29) and carries out secondary heat exchange.
Principle Problems involved by scheme:
First, traditional low temperature nitrogen liquefaction system many employings plate-fin overall heat exchange mode, heat exchange efficiency comparatively tandem type nitrogen liquefaction system is significantly improved, heat exchanger quantity is reduced, overall LNG Lquified Process Flow is simplified, and the refrigeration system of independent operating reduces, convenient management, but Problems existing is after LNG Lquified Process Flow simplification, makes LN
2main heat exchanger is bulky, and heat-exchanging process is complicated, and processing and manufacturing, in-site installation and transport difficulty increase, and once there is the problems such as leakage, is difficult to detect, easily causes whole heat exchanger to scrap, and set technique equipment stops production.For addressing this problem, main heat exchanger inner high voltage nitrogen temperature change procedure is divided into 42 DEG C ~-38 DEG C ,-38 DEG C ~-127.2 DEG C by the present invention,-127.2 DEG C ~-188.2 DEG C three ranks, adopt three independently heat exchangers, complete three temperature ranges heat transfer process from high to low, primary study exploitation-38 DEG C ~-127.2 DEG C, second level nitrogen low-temperature heat exchange flow process and second level overall heat exchanger structure and heat-exchanging process parameter, and adopt three plume backheat refrigeration process, solve second level cooling heat exchange plant issue.Research process is relatively independent, can be connected to become entirety with front and back stages, consistent with integrated main heat exchanger heat exchange principle after connecting, and transports and install after being convenient to main heat exchanger partition.Secondly, because common tubular heat exchanger adopts tube sheet to connect bundle of parallel tubes mode, structure is simple, and self-constriction ability is poor, and be generally the heat exchange of sub-thread stream, heat exchange efficiency is lower, and volume is comparatively large, and the temperature difference is less, is difficult to high pressure N
2cool in a flow process and liquefy, the present invention adopts six plume four tube bank type spiral winding pipe type heat exchange equipments to carry out the intensive heat transfer process of multiple flow low temperature, can solve secondary refrigeration multiple flow low-temperature heat exchange problem, reduce heat exchanger quantity, improve heat exchange efficiency.In addition, because secondary refrigeration equipment heat exchange warm area is between-38 DEG C ~-130.2 DEG C, traditional expanded material heat-insulation layer is difficult to prevent cold transmission, leak heat serious, cause high pressure nitrogen to lower the temperature, the problems such as reflux fluid temperature is too high, and the present invention adopt vacuum multi-layer insulation technology, heat exchange warm area is owing to keeping high vacuum state, and vacuum is 10
-3pa, heat convection is negligible; Form vacuum multilayer insulation protective layer because application multilayer heat insulation paper and aluminium foil are wound around shell side, heat radiation reduces greatly, and add outside plurality of thermal insulation layers and have pearlife radiation proof, fix density of radiate heat exchange is reduced to 10
-2w/m
2below; Owing to adopting the protection of vacuum multilayer insulation paper, heat transfer is reduced to 10
-3below W/m.K, after three kinds of heat transfer types combine, overall thermal current density is less than 10W/m
2, be less than traditional heat insulation layer protection leaking heat, can guarantee that secondary heat exchange process loss of refrigeration capacity is minimum.In addition, traditional nitrogen hydrogen Calculate Ways directly injects synthesis gas tube bank when being and the nitrogen that nitrogen gas generating system is produced is pressurized to 5.14MPa, after reaching one to three accurate trim, proceed to one-level refrigerating plant, meet the proportioning problem of nitrogen hydrogen in synthetic ammonia, but this method needs 5.14MPa supercharging nitrogen to supplement trim, need to add multistage nitrogen compressor bank in addition, but, owing to having the high pressure shell side nitrogen of 5.8MPa in two-stage system device for cooling.The present invention directly draws 5.7MPa high pressure nitrogen bottom secondary heat exchanger, squeezes into the tube bank of secondary synthesis gas, can reach the object of accurate trim nitrogen hydrogen ratio, no longer increase nitrogen multi-stage compression system after throttling to 5.14MPa, cost-saved.Finally, stage casing purified gas inlet temperature is-63.3 DEG C, being averaged logarithmic temperature difference is 3 DEG C, if set-63.3 DEG C for secondary refrigeration inlet temperature, then one-level refrigeration maximum temperature difference is 108.3 DEG C, secondary refrigeration maximum temperature difference is 66.9 DEG C, the cold maximum temperature difference of three tier structure is 66.2 DEG C, three Temperature Difference Ratios comparatively after, because the one-level refrigeration temperature difference is comparatively large, cause one-level refrigerating plant compared with secondary and three grades of volumes large, heat exchange load is high, therefore, in order to appropriate design syllogic refrigerating plant, reasonable distribution heat transfer temperature difference is needed.According to the detailed computational process of heat exchange amount, distribute one-level refrigeration maximum temperature difference 83 DEG C, secondary refrigeration maximum temperature difference 89 DEG C, the cold maximum temperature difference of three tier structure 66.2 DEG C, can make three sections of heat exchanger profile sizes similar like this, be easy to processing and manufacturing, transport and installation and debugging.So two-stage system device for cooling adopts purified gas stage casing to squeeze into mode heat exchange.Secondary refrigeration totally six plume heat exchange and must adopt four tube bank be wound around pipe type heat transfers equipment carry out the heat exchange of low temperature backheat, three strands of backheat cold flows cool two strands of incoming flows, draw the heat exchange of trim one plume reflux, under can completing high pressure low temperature operating mode, six plumes four restrain winding tubular type heat transfer process.
Technical characterstic of the present invention:
The present invention is wound around pipe type heat transfer equipment mainly for low temperature liquid nitrogen secondary backheat multiple flow, employing has six plumes four that volume is little, heat exchange efficiency is high, heat transfer temperature difference is large, have self-tightening contraction adjustment function and restrains spiral winding pipe type heat exchange equipment ,-130.2 DEG C, 1.78MPa H of three tier structure device for cooling outlet in application of cold temperature liquid nitrogen technique
2,-130.2 DEG C, 5.14MPa N
2-H
2synthesis gas and-130.2 DEG C, 0.15MPa N
2-A
r-CO-CH
4dirty nitrogen cooling-38 DEG C, 5.8MPa N
2to-127.2 DEG C, 5.7MPa and cooling be from-63.3 DEG C, 5.26MPa H of low-temp methanol technique
2-N
2-CO-A
r-CH
4purified gas, to-127.2 DEG C, 5.24MPa, namely applies the N of three tier structure device for cooling outlet
2-H
2synthesis gas, high pressure H
2and the cold backheat cooling incoming higher pressure N of dirty nitrogen
2, purified gas after low-temperature rectisol, provide temperature conditions to three tier structure device for cooling.The present invention adopts stage casing to squeeze into the heat exchange of-63.3 DEG C of low temperature purification gas, whole installation three is restrained and four tube banks arrange two sections of shell side heat transfer process, three bursts of precooling cold flow tube banks are centrally wound around and straight-through two sections of shell sides, purified gas tube bank adopts stage casing be wound around under pre-cooler tube bundle extroversion and be arranged at lower housing portion, form four with three strands of pre-cooler tube bundles and restrain winding arrangement, can be used for-38 DEG C ~-130.2 DEG C gas band phase change cryogenic field of heat exchange, improve the low temperature backheat heat exchange efficiency of low temperature liquid nitrogen process system, reduce heat exchanger quantity.The present invention adopts vacuum multi-layer insulation technology, is wound around tubular type heat exchange characteristic, can guarantees that secondary heat exchange process loss of refrigeration capacity is minimum in conjunction with multiple flow.The present invention adopts bottom secondary heat exchanger and draws high pressure nitrogen, squeezes into secondary synthesis gas tube bank method after throttling to 5.14MPa, can the object of accurate trim nitrogen hydrogen ratio, no longer increases nitrogen multi-stage compression system, cost-saved.The present invention is according to the detailed computational process of heat exchange amount, purified gas stage casing is adopted to squeeze into mode heat exchange mode, distribute one-level refrigeration maximum temperature difference 83 DEG C, secondary refrigeration maximum temperature difference 89 DEG C, the cold maximum temperature difference of three tier structure 66.2 DEG C, three-segment type heat exchange device profile size can be made similar, be easy to processing and manufacturing, transport and installation and debugging.
Accompanying drawing explanation
Figure 1 shows that low temperature liquid nitrogen secondary backheat multiple flow is wound around critical piece structure and the position relationship of pipe type heat transfer equipment.
Detailed description of the invention
Processing and manufacturing low temperature liquid nitrogen is wound around pipe type heat transfer equipment with secondary backheat multiple flow, comprises secondary high pressure N
2entrance sleeve (1), secondary upper cover vacuum multilayer insulation layer (2), end socket (3) is pressed in secondary, the dirty nitrogen outlet tube sheet of secondary (4), the dirty nitrogen discharge connection of secondary (5), the dirty nitrogen outlet(discharge) flange of secondary (6), the dirty nitrogen outlet bobbin carriage of secondary (7), secondary external pressure upper shell (8), secondary dividing plate (9), secondary upper shell vacuum multilayer insulation layer (10), cylindrical shell (11) is pressed in secondary, secondary pearlife (12), external pressure heads in secondary (13), external pressure heads vacuum multilayer insulation layer (14) in secondary, press seal head (15) in secondary, secondary external pressure lower shell (16), bracing ring in secondary (17), secondary lower shell vacuum multilayer insulation layer (18), cylindrical shell (19) is depressed in secondary, secondary purification gas outlet tube sheet (20), secondary purification gas outlet bobbin carriage (21), secondary purification gas discharge connection (22), secondary purification gas outlet(discharge) flange (23), the dirty nitrogen inlet bobbin carriage of secondary (24), the dirty nitrogen inlet flange of secondary (25), the dirty nitrogen inlet adapter of secondary (26), the dirty nitrogen inlet tube sheet of secondary (27), the dirty nitrogen of secondary is wound around tube bank (28), secondary N
2-H
2synthesis gas winding tube bank (29), secondary essence are joined high pressure nitrogen outlet(discharge) flange (30), secondary essence is joined high pressure nitrogen discharge connection (31), secondary external pressure low head (32), secondary high pressure N
2discharge connection (33), secondary high pressure N
2end socket (36), secondary N is depressed in outlet(discharge) flange (34), secondary low head vacuum multilayer insulation layer (35), secondary
2-H
2synthesis gas suction flange (37), secondary N
2-H
2synthesis gas entrance sleeve (38), secondary N
2-H
2synthesis gas import bobbin carriage (39), secondary N
2-H
2synthesis gas import tube sheet (40), secondary H
2import bobbin carriage (41), secondary H
2suction flange (42),Secondary H
2Entrance sleeve (43), secondary H
2Import tube sheet (44), secondary H
2Be wound around bracing ring (56), secondary H on tube bank (45), secondary purification gas winding tube bank (46), secondary lower support circle (47), secondary tube bank demarcation strip (48), the outer coil pipe (49) of spiral, secondary purification gas import tube sheet (50), secondary purification gas import bobbin carriage (51), secondary purification gas entrance sleeve (52), secondary purification gas suction flange (53), spiral inner coil pipe (54), secondary center cylinder (55), secondary
2Outlet tube sheet (57), secondary H
2Outlet bobbin carriage (58), secondary H
2Discharge connection (59), secondary H
2Outlet(discharge) flange (60), secondary N
2-H
2Syngas outlet flange (61), secondary N
2-H
2Syngas outlet adapter (62), secondary N
2-H
2Syngas outlet bobbin carriage (63), secondary N
2-H
2Syngas outlet tube sheet (64), secondary external pressure upper cover (65), secondary high pressure N
2Suction flange (66), and each parts meet following annexation: the dirty nitrogen of secondary is wound around tube bank (28), secondary N
2-H
2Synthesis gas is wound around tube bank (29), secondary H
2Be wound around tube bank (45), be wound around around secondary center cylinder (55), after being wound around, form spiral inner coil pipe (54); Secondary purification gas is wound around tube bank (46) and is wound around around spiral inner coil pipe (54), the outer coil pipe (49) of spiral is formed after being wound around, the outer coil pipe (49) of spiral, lower than spiral inner coil pipe (54), is extracted out by heat exchanger stage casing; Spiral inner coil pipe (54) after winding is positioned at secondary and presses cylindrical shell (11) and secondary and depress cylindrical shell (19),The outer coil pipe (49) of spiral is positioned at secondary and depresses cylindrical shell (19); Bracing ring (56) on secondary is installed in secondary center cylinder (55) one end, secondary lower support circle (47) is installed in one end, bracing ring on secondary (56) is fixed on and in secondary, presses cylindrical shell (11) top, and secondary lower support circle (47) is fixed on depresses cylindrical shell (19) bottom in secondary; Bracing ring in secondary (17) is installed in spiral inner coil pipe (54) and secondary and depresses between cylindrical shell (19), and is positioned at lower shell (19) top; The dirty nitrogen of secondary is wound around tube bank (28), secondary N
2-H
2Synthesis gas is wound around tube bank (29), secondary H
2Be wound around tube bank (45) to be wound between bracing ring on secondary (56) and secondary lower support circle (47); Secondary purification gas is wound around tube bank (46) and is wound between bracing ring in secondary (17) and secondary lower support circle (47); In secondary, press cylindrical shell (11) top and in secondary, press end socket (3) and be connected, in secondary, press end socket (3) top secondary high pressure N is installed
2Entrance sleeve (1) and secondary high pressure N
2Suction flange (66); In secondary, press cylindrical shell (11) bottom to be connected with end socket (15) top in pressure in secondary, in end socket (15) bottom connection secondary, cylindrical shell (19) is depressed in pressing in secondary, in secondary, depress cylindrical shell (19) bottom and in secondary, depress end socket (36) and be connected, in secondary, depress end socket (36) top secondary high pressure N is installed
2Discharge connection (33) and secondary high pressure N
2Outlet(discharge) flange (34); In secondary, press cylindrical shell (11) upper left-hand the dirty nitrogen outlet tube sheet of secondary (4) is installed, the dirty nitrogen outlet tube sheet of secondary (4) the left side connection dirty nitrogen outlet bobbin carriage of secondary (7), the dirty nitrogen outlet(discharge) flange of dirty nitrogen outlet bobbin carriage (7) the top connection dirty nitrogen discharge connection of secondary of secondary (5) and secondary (6); In the middle of pressing cylindrical shell (11) top in secondary, secondary N is installed
2-H
2Syngas outlet tube sheet (64), secondary N
2-H
2Syngas outlet tube sheet (64) is connection secondary N above
2-H
2Syngas outlet bobbin carriage (63), secondary N
2-H
2Syngas outlet bobbin carriage (63) top connection secondary N
2-H
2Syngas outlet adapter (62) and secondary N
2-H
2Syngas outlet flange (61); In secondary, press cylindrical shell (11) upper right secondary H is installed
2Outlet tube sheet (57), secondary H
2Outlet tube sheet (57) right side connection secondary H
2Outlet bobbin carriage (58), secondary H
2Outlet bobbin carriage (58) top connection secondary H
2Discharge connection (59) and secondary H
2Outlet(discharge) flange (60); In secondary, depress cylindrical shell (19) upper right secondary purification gas import tube sheet (50) is installed, secondary purification gas import tube sheet (50) left side connection secondary purification gas import bobbin carriage (51), secondary purification gas import bobbin carriage (51) top connection secondary purification gas entrance sleeve (52) and secondary purification gas suction flange (53); In secondary, depress cylindrical shell (19) lower left side secondary purification gas outlet tube sheet (20) is installed, secondary purification gas outlet tube sheet (20) left side connection secondary purification gas outlet bobbin carriage (21), secondary purification gas outlet bobbin carriage (21) top connection secondary purification gas discharge connection (22) and secondary purification gas suction flange (23); In the middle of depressing cylindrical shell (19) bottom in secondary, secondary N is installed
2-H
2Synthesis gas import tube sheet (40), secondary N
2-H
2Synthesis gas import tube sheet (40) is connection secondary N above
2-H
2Synthesis gas import bobbin carriage (39), secondary N
2-H
2Synthesis gas import bobbin carriage (39) top connection secondary N
2-H
2synthesis gas entrance sleeve (38) and secondary N
2-H
2synthesis gas suction flange (37), in secondary, depress cylindrical shell (19) lower left side the dirty nitrogen inlet tube sheet of secondary (27) is installed, the dirty nitrogen inlet tube sheet of secondary (27) the left side connection dirty nitrogen inlet bobbin carriage of secondary (24), the dirty nitrogen inlet flange of secondary dirty nitrogen inlet bobbin carriage (24) the top connection dirty nitrogen inlet adapter of secondary (26) and secondary (25), in secondary, depress cylindrical shell (19) right side, bottom secondary H is installed
2import tube sheet (44), secondary H
2import tube sheet (44) right side connection secondary H
2import bobbin carriage (41), secondary H
2import bobbin carriage (41) top connection secondary H
2entrance sleeve (43) and secondary H
2suction flange (42), in secondary, depress and install that secondary essence is joined high pressure nitrogen discharge connection (31), secondary essence is joined high pressure nitrogen outlet(discharge) flange (30) in the middle of cylindrical shell (19) bottom, end socket (3) is pressed in secondary, cylindrical shell (11) is pressed in secondary, end socket (15) in pressing in secondary, cylindrical shell (19) is depressed in secondary, in secondary, depress end socket (36) outer surface and alternately wrap up respectively the secondary upper cover vacuum multilayer insulation layer (2) being formed by multilayer heat insulation paper and laminated aluminium foil, secondary upper shell vacuum multilayer insulation layer (10), external pressure heads vacuum multilayer insulation layer (14) in secondary, secondary lower shell vacuum multilayer insulation layer (18), secondary low head vacuum multilayer insulation layer (35), external pressure heads (13), secondary external pressure lower shell (16), secondary external pressure low head (32) in secondary external pressure upper cover (65), secondary external pressure upper shell (8), secondary outside external pressure heads vacuum multilayer insulation layer (14), secondary lower shell vacuum multilayer insulation layer (18), secondary low head vacuum multilayer insulation layer (35), is respectively in secondary upper cover vacuum multilayer insulation layer (2), secondary upper shell vacuum multilayer insulation layer (10), secondary, secondary pearlife (12) is filled in vacuum heat-insulating layer, secondary external pressure upper shell (8) top penetrates installs the dirty nitrogen discharge connection of secondary (5), secondary N
2-H
2syngas outlet adapter (62), secondary H
2discharge connection (59),Secondary external pressure lower shell (16) top penetrates installs secondary purification gas entrance sleeve (52), and bottom penetrates installs secondary purification gas discharge connection (22), the dirty nitrogen inlet adapter of secondary (26), secondary H
2Entrance sleeve (43), secondary N
2-H
2Synthesis gas entrance sleeve (38), secondary essence are joined high pressure nitrogen discharge connection (31); Secondary external pressure upper cover (65) middle part penetrates installs secondary high pressure N
2Entrance sleeve (1); Secondary external pressure low head (32) middle part penetrates installs secondary high pressure N
2Discharge connection (33).
By H
2-130.2 DEG C, 1.78MPa time squeeze into secondary H
2import bobbin carriage (41), at secondary H
2import bobbin carriage is allocated in secondary H in (41)
2be wound around tube bank (45) each arm, secondary H
2be wound around tube bank (45) to depress in secondary after spiral winding in cylindrical shell (19) and secondary and press in cylindrical shell (11) by from secondary high pressure N
2the shell side high pressure N of entrance sleeve (1)
2heating, temperature is increased to-41 DEG C, Pressure Drop is low to moderate 1.76MPa, then flow to secondary H
2outlet bobbin carriage (58), then through secondary H
2discharge connection (59) flows out into one-level refrigerating plant.
By N
2-H
2synthesis gas-130.2 DEG C, 5.14MPa time squeeze into secondary N
2-H
2synthesis gas import bobbin carriage (39), at secondary N
2-H
2secondary N is allocated in synthesis gas import bobbin carriage (39)
2-H
2synthesis gas is wound around tube bank (29) each arm, secondary N
2-H
2synthesis gas is wound around tube bank (29) and depresses in secondary after spiral winding in cylindrical shell (19) and secondary and press in cylindrical shell (11) by from secondary high pressure N
2the shell side high pressure N of entrance sleeve (1)
2heating, temperature is increased to-41 DEG C, Pressure Drop is low to moderate 5.09MPa, then flow to secondary N
2-H
2syngas outlet bobbin carriage (63), then through secondary N
2-H
2syngas outlet adapter (62) flows out into one-level refrigerating plant.
By N
2-A
r-CO-CH
4dirty nitrogen-130.2 DEG C, 0.15MPa time squeeze into dirty nitrogen inlet bobbin carriage (24) of secondary, in dirty nitrogen inlet bobbin carriage (24) of secondary, be allocated in the dirty nitrogen of secondary be wound around tube bank (28) each arm, the dirty nitrogen of secondary is wound around tube bank (28) and depresses in secondary after spiral winding in cylindrical shell (19) and secondary and press in cylindrical shell (11) by from secondary high pressure N
2the shell side high pressure N of entrance sleeve (1)
2heating, temperature is increased to-41 DEG C, Pressure Drop is low to moderate 0.12MPa, then flow to dirty nitrogen outlet bobbin carriage (7) of secondary, then flows out into one-level refrigerating plant through dirty nitrogen discharge connection (5) of secondary.
By H
2-N
2-CO-A
r-CH
4purified gas-63.3 DEG C, 5.26MPa time squeeze into secondary purification gas import bobbin carriage (51), in secondary purification gas import bobbin carriage (51), be allocated in secondary purification gas be wound around tube bank (46) each arm, secondary purification gas is wound around tube bank (46) and depresses in secondary after spiral winding in cylindrical shell (19) by-130.2 DEG C, 1.78MPa H
2,-130.2 DEG C, 5.14MPa N
2-H
2synthesis gas and-130.2 DEG C, 0.15MPa N
2-A
r-CO-CH
4dirty nitrogen is cooled to-127.2 DEG C, 5.24MPa, then flow to secondary purification gas outlet bobbin carriage (21), then flows out into three tier structure device for cooling through secondary purification gas discharge connection (22).
By high pressure N
2-38 DEG C, 5.8MPa time through secondary high pressure N
2entrance sleeve (1) squeezes into housing, is wound around dirty nitrogen, secondary N in tube bank (28) by the dirty nitrogen of secondary
2-H
2synthesis gas is wound around tube bank (29) interior synthesis gas, secondary H
2be wound around tube bank (45) interior hydrogen_cooling to-127.2 DEG C, 5.7MPa N
2, through secondary high pressure N
2discharge connection (33) flows out and squeezes into three tier structure device for cooling.
Essence is joined high pressure N
2-127.2 DEG C, 5.7MPa time through secondary essence join high pressure nitrogen discharge connection (31) draw housing, squeeze into secondary N by connecting line
2-H
2synthesis gas import bobbin carriage (39) carries out N
2, H
2ratio 1:3 essence is joined, essence join after N
2-H
2synthesis gas squeezes into secondary N again
2-H
2synthesis gas is wound around tube bank (29) and carries out secondary heat exchange.
Claims (7)
1. low temperature liquid nitrogen is wound around pipe type heat transfer equipment with secondary backheat multiple flow, comprises secondary high pressure N
2entrance sleeve (1), secondary upper cover vacuum multilayer insulation layer (2), end socket (3) is pressed in secondary, the dirty nitrogen outlet tube sheet of secondary (4), the dirty nitrogen discharge connection of secondary (5), the dirty nitrogen outlet(discharge) flange of secondary (6), the dirty nitrogen outlet bobbin carriage of secondary (7), secondary external pressure upper shell (8), secondary dividing plate (9), secondary upper shell vacuum multilayer insulation layer (10), cylindrical shell (11) is pressed in secondary, secondary pearlife (12), external pressure heads in secondary (13), external pressure heads vacuum multilayer insulation layer (14) in secondary, press seal head (15) in secondary, secondary external pressure lower shell (16), bracing ring in secondary (17), secondary lower shell vacuum multilayer insulation layer (18), cylindrical shell (19) is depressed in secondary, secondary purification gas outlet tube sheet (20), secondary purification gas outlet bobbin carriage (21), secondary purification gas discharge connection (22), secondary purification gas outlet(discharge) flange (23), the dirty nitrogen inlet bobbin carriage of secondary (24), the dirty nitrogen inlet flange of secondary (25), the dirty nitrogen inlet adapter of secondary (26), the dirty nitrogen inlet tube sheet of secondary (27), the dirty nitrogen of secondary is wound around tube bank (28), secondary N
2-H
2synthesis gas winding tube bank (29), secondary essence are joined high pressure nitrogen outlet(discharge) flange (30), secondary essence is joined high pressure nitrogen discharge connection (31), secondary external pressure low head (32), secondary high pressure N
2discharge connection (33), secondary high pressure N
2end socket (36), secondary N is depressed in outlet(discharge) flange (34), secondary low head vacuum multilayer insulation layer (35), secondary
2-H
2synthesis gas suction flange (37), secondary N
2-H
2synthesis gas entrance sleeve (38), secondary N
2-H
2synthesis gas import bobbin carriage (39), secondary N
2-H
2synthesis gas import tube sheet (40), secondary H
2import bobbin carriage (41), secondary H
2suction flange (42),Secondary H
2Entrance sleeve (43), secondary H
2Import tube sheet (44), secondary H
2Be wound around bracing ring (56), secondary H on tube bank (45), secondary purification gas winding tube bank (46), secondary lower support circle (47), secondary tube bank demarcation strip (48), the outer coil pipe (49) of spiral, secondary purification gas import tube sheet (50), secondary purification gas import bobbin carriage (51), secondary purification gas entrance sleeve (52), secondary purification gas suction flange (53), spiral inner coil pipe (54), secondary center cylinder (55), secondary
2Outlet tube sheet (57), secondary H
2Outlet bobbin carriage (58), secondary H
2Discharge connection (59), secondary H
2Outlet(discharge) flange (60), secondary N
2-H
2Syngas outlet flange (61), secondary N
2-H
2Syngas outlet adapter (62), secondary N
2-H
2Syngas outlet bobbin carriage (63), secondary N
2-H
2Syngas outlet tube sheet (64), secondary external pressure upper cover (65), secondary high pressure N
2Suction flange (66), is characterized in that: the dirty nitrogen of secondary is wound around tube bank (28), secondary N
2-H
2Synthesis gas is wound around tube bank (29), secondary H
2Be wound around tube bank (45), be wound around around secondary center cylinder (55), after being wound around, form spiral inner coil pipe (54); Secondary purification gas is wound around tube bank (46) and is wound around around spiral inner coil pipe (54), the outer coil pipe (49) of spiral is formed after being wound around, the outer coil pipe (49) of spiral, lower than spiral inner coil pipe (54), is extracted out by heat exchanger stage casing; Spiral inner coil pipe (54) after winding is positioned at secondary and presses cylindrical shell (11) and secondary and depress cylindrical shell (19),The outer coil pipe (49) of spiral is positioned at secondary and depresses cylindrical shell (19); Bracing ring (56) on secondary is installed in secondary center cylinder (55) one end, secondary lower support circle (47) is installed in one end, bracing ring on secondary (56) is fixed on and in secondary, presses cylindrical shell (11) top, and secondary lower support circle (47) is fixed on depresses cylindrical shell (19) bottom in secondary; Bracing ring in secondary (17) is installed in spiral inner coil pipe (54) and secondary and depresses between cylindrical shell (19), and is positioned at secondary and depresses cylindrical shell (19) top; The dirty nitrogen of secondary is wound around tube bank (28), secondary N
2-H
2Synthesis gas is wound around tube bank (29), secondary H
2Be wound around tube bank (45) to be wound between bracing ring on secondary (56) and secondary lower support circle (47); Secondary purification gas is wound around tube bank (46) and is wound between bracing ring in secondary (17) and secondary lower support circle (47); In secondary, press cylindrical shell (11) top and in secondary, press end socket (3) and be connected, in secondary, press end socket (3) top secondary high pressure N is installed
2Entrance sleeve (1) and secondary high pressure N
2Suction flange (66); In secondary, press cylindrical shell (11) bottom to be connected with end socket (15) top in pressure in secondary, in end socket (15) bottom connection secondary, cylindrical shell (19) is depressed in pressing in secondary, in secondary, depress cylindrical shell (19) bottom and in secondary, depress end socket (36) and be connected, in secondary, depress end socket (36) top secondary high pressure N is installed
2Discharge connection (33) and secondary high pressure N
2Outlet(discharge) flange (34); In secondary, press cylindrical shell (11) upper left-hand the dirty nitrogen outlet tube sheet of secondary (4) is installed, the dirty nitrogen outlet tube sheet of secondary (4) the left side connection dirty nitrogen outlet bobbin carriage of secondary (7), the dirty nitrogen outlet(discharge) flange of dirty nitrogen outlet bobbin carriage (7) the top connection dirty nitrogen discharge connection of secondary of secondary (5) and secondary (6); In the middle of pressing cylindrical shell (11) top in secondary, secondary N is installed
2-H
2Syngas outlet tube sheet (64), secondary N
2-H
2Syngas outlet tube sheet (64) is connection secondary N above
2-H
2Syngas outlet bobbin carriage (63), secondary N
2-H
2Syngas outlet bobbin carriage (63) top connection secondary N
2-H
2Syngas outlet adapter (62) and secondary N
2-H
2Syngas outlet flange (61); In secondary, press cylindrical shell (11) upper right secondary H is installed
2Outlet tube sheet (57), secondary H
2Outlet tube sheet (57) right side connection secondary H
2Outlet bobbin carriage (58), secondary H
2Outlet bobbin carriage (58) top connection secondary H
2Discharge connection (59) and secondary H
2Outlet(discharge) flange (60); In secondary, depress cylindrical shell (19) upper right secondary purification gas import tube sheet (50) is installed, secondary purification gas import tube sheet (50) left side connection secondary purification gas import bobbin carriage (51), secondary purification gas import bobbin carriage (51) top connection secondary purification gas entrance sleeve (52) and secondary purification gas suction flange (53); In secondary, depress cylindrical shell (19) lower left side secondary purification gas outlet tube sheet (20) is installed, secondary purification gas outlet tube sheet (20) left side connection secondary purification gas outlet bobbin carriage (21), secondary purification gas outlet bobbin carriage (21) top connection secondary purification gas discharge connection (22) and secondary purification gas suction flange (23); In the middle of depressing cylindrical shell (19) bottom in secondary, secondary N is installed
2-H
2Synthesis gas import tube sheet (40), secondary N
2-H
2Synthesis gas import tube sheet (40) is connection secondary N above
2-H
2Synthesis gas import bobbin carriage (39), secondary N
2-H
2Synthesis gas import bobbin carriage (39) top connection secondary N
2-H
2synthesis gas entrance sleeve (38) and secondary N
2-H
2synthesis gas suction flange (37), in secondary, depress cylindrical shell (19) lower left side the dirty nitrogen inlet tube sheet of secondary (27) is installed, the dirty nitrogen inlet tube sheet of secondary (27) the left side connection dirty nitrogen inlet bobbin carriage of secondary (24), the dirty nitrogen inlet flange of secondary dirty nitrogen inlet bobbin carriage (24) the top connection dirty nitrogen inlet adapter of secondary (26) and secondary (25), in secondary, depress cylindrical shell (19) right side, bottom secondary H is installed
2import tube sheet (44), secondary H
2import tube sheet (44) right side connection secondary H
2import bobbin carriage (41), secondary H
2import bobbin carriage (41) top connection secondary H
2entrance sleeve (43) and secondary H
2suction flange (42), in secondary, depress and install that secondary essence is joined high pressure nitrogen discharge connection (31), secondary essence is joined high pressure nitrogen outlet(discharge) flange (30) in the middle of cylindrical shell (19) bottom, end socket (3) is pressed in secondary, cylindrical shell (11) is pressed in secondary, end socket (15) in pressing in secondary, cylindrical shell (19) is depressed in secondary, in secondary, depress end socket (36) outer surface and alternately wrap up respectively the secondary upper cover vacuum multilayer insulation layer (2) being formed by multilayer heat insulation paper and laminated aluminium foil, secondary upper shell vacuum multilayer insulation layer (10), external pressure heads vacuum multilayer insulation layer (14) in secondary, secondary lower shell vacuum multilayer insulation layer (18), secondary low head vacuum multilayer insulation layer (35), external pressure heads (13), secondary external pressure lower shell (16), secondary external pressure low head (32) in secondary external pressure upper cover (65), secondary external pressure upper shell (8), secondary outside external pressure heads vacuum multilayer insulation layer (14), secondary lower shell vacuum multilayer insulation layer (18), secondary low head vacuum multilayer insulation layer (35), is respectively in secondary upper cover vacuum multilayer insulation layer (2), secondary upper shell vacuum multilayer insulation layer (10), secondary, secondary pearlife (12) is filled in vacuum heat-insulating layer, secondary external pressure upper shell (8) top penetrates installs the dirty nitrogen discharge connection of secondary (5), secondary N
2-H
2syngas outlet adapter (62), secondary H
2discharge connection (59),Secondary external pressure lower shell (16) top penetrates installs secondary purification gas entrance sleeve (52), and bottom penetrates installs secondary purification gas discharge connection (22), the dirty nitrogen inlet adapter of secondary (26), secondary H
2Entrance sleeve (43), secondary N
2-H
2Synthesis gas entrance sleeve (38), secondary essence are joined high pressure nitrogen discharge connection (31); Secondary external pressure upper cover (65) middle part penetrates installs secondary high pressure N
2Entrance sleeve (1); Secondary external pressure low head (32) middle part penetrates installs secondary high pressure N
2Discharge connection (33).
2. low temperature liquid nitrogen secondary backheat multiple flow according to claim 1 is wound around pipe type heat transfer equipment, it is characterized in that: H
2-130.2 DEG C, 1.78MPa time enter secondary H
2import bobbin carriage (41), at secondary H
2import bobbin carriage is allocated in secondary H in (41)
2be wound around tube bank (45) each arm, secondary H
2be wound around tube bank (45) to depress in secondary after spiral winding in cylindrical shell (19) and secondary and press in cylindrical shell (11) by from secondary high pressure N
2the shell side high pressure N of entrance sleeve (1)
2heating, temperature is increased to-41 DEG C, Pressure Drop is low to moderate 1.76MPa, then flow to secondary H
2outlet bobbin carriage (58), then through secondary H
2discharge connection (59) flows out into one-level refrigerating plant.
3. low temperature liquid nitrogen secondary backheat multiple flow according to claim 1 is wound around pipe type heat transfer equipment, it is characterized in that: N
2-H
2synthesis gas-130.2 DEG C, 5.14MPa time enter secondary N
2-H
2synthesis gas import bobbin carriage (39), at secondary N
2-H
2secondary N is allocated in synthesis gas import bobbin carriage (39)
2-H
2synthesis gas is wound around tube bank (29) each arm, secondary N
2-H
2synthesis gas is wound around tube bank (29) and depresses in secondary after spiral winding in cylindrical shell (19) and secondary and press in cylindrical shell (11) by from secondary high pressure N
2the shell side high pressure N of entrance sleeve (1)
2heating, temperature is increased to-41 DEG C, Pressure Drop is low to moderate 5.09MPa, then flow to secondary N
2-H
2syngas outlet bobbin carriage (63), then through secondary N
2-H
2syngas outlet adapter (62) flows out into one-level refrigerating plant.
4. low temperature liquid nitrogen secondary backheat multiple flow according to claim 1 is wound around pipe type heat transfer equipment, it is characterized in that: N
2-A
r-CO-CH
4dirty nitrogen-130.2 DEG C, 0.15MPa time enter dirty nitrogen inlet bobbin carriage (24) of secondary, in dirty nitrogen inlet bobbin carriage (24) of secondary, be allocated in the dirty nitrogen of secondary be wound around tube bank (28) each arm, the dirty nitrogen of secondary is wound around tube bank (28) and depresses in secondary after spiral winding in cylindrical shell (19) and secondary and press in cylindrical shell (11) by from secondary high pressure N
2the shell side high pressure N of entrance sleeve (1)
2heating, temperature is increased to-41 DEG C, Pressure Drop is low to moderate 0.12MPa, then flow to dirty nitrogen outlet bobbin carriage (7) of secondary, then flows out into one-level refrigerating plant through dirty nitrogen discharge connection (5) of secondary.
5. low temperature liquid nitrogen secondary backheat multiple flow according to claim 1 is wound around pipe type heat transfer equipment, it is characterized in that: H
2-N
2-CO-A
r-CH
4purified gas-63.3 DEG C, 5.26MPa time enter secondary purification gas import bobbin carriage (51), in secondary purification gas import bobbin carriage (51), be allocated in secondary purification gas be wound around tube bank (46) each arm, secondary purification gas is wound around tube bank (46) and depresses in secondary after spiral winding in cylindrical shell (19) by-130.2 DEG C, 1.78MPa H
2,-130.2 DEG C, 5.14MPa N
2-H
2synthesis gas and-130.2 DEG C, 0.15MPa N
2-A
r-CO-CH
4dirty nitrogen is cooled to-127.2 DEG C, 5.24MPa, then flow to secondary purification gas outlet bobbin carriage (21), then flows out into three tier structure device for cooling through secondary purification gas discharge connection (22).
6. low temperature liquid nitrogen secondary backheat multiple flow according to claim 1 is wound around pipe type heat transfer equipment, it is characterized in that: high pressure N
2-38 DEG C, 5.8MPa time through secondary high pressure N
2entrance sleeve (1) enters housing, is wound around dirty nitrogen, secondary N in tube bank (28) by the dirty nitrogen of secondary
2-H
2synthesis gas is wound around tube bank (29) interior synthesis gas, secondary H
2be wound around tube bank (45) interior hydrogen_cooling to-127.2 DEG C, 5.7MPa N
2, through secondary high pressure N
2discharge connection (33) flows out into three tier structure device for cooling.
7. low temperature liquid nitrogen secondary backheat multiple flow according to claim 1 is wound around pipe type heat transfer equipment, it is characterized in that: essence joins high pressure N
2-127.2 DEG C, 5.7MPa time through secondary essence join high pressure nitrogen discharge connection (31) draw housing, squeeze into secondary N by connecting line
2-H
2synthesis gas import bobbin carriage (39) carries out N
2, H
2ratio 1:3 essence is joined, essence join after N
2-H
2synthesis gas enters secondary N
2-H
2synthesis gas is wound around tube bank (29) and carries out secondary heat exchange.
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| CN201310361165.7A CN103438736B (en) | 2013-08-19 | 2013-08-19 | Two-stage back heating multi-strand winding pipe type heat exchange device for low-temperature liquid nitrogen |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102455113A (en) * | 2011-11-25 | 2012-05-16 | 张周卫 | Liquefied natural gas (LNG) low-temperature liquefied primary refrigerating four-stream spiral twined pipe type heat exchange equipment |
| CN102455139A (en) * | 2011-10-18 | 2012-05-16 | 张周卫 | Double-strand-flow low-temperature spiral winding pipe type heat exchanger with vacuum heat insulation function |
| CN102538388A (en) * | 2011-11-24 | 2012-07-04 | 张周卫 | Three-stream spiral wound type heat exchange equipment for secondary refrigeration and low-temperature liquefaction of LNG (liquefied natural gas) |
| CN102564167A (en) * | 2011-10-14 | 2012-07-11 | 张周卫 | Single-flow low-temperature spiral winding tube type heat exchanger with vacuum heat-insulation effect |
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| US6886361B2 (en) * | 2000-06-28 | 2005-05-03 | Igc-Polycold Systems, Inc. | Liquid chiller evaporator |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102564167A (en) * | 2011-10-14 | 2012-07-11 | 张周卫 | Single-flow low-temperature spiral winding tube type heat exchanger with vacuum heat-insulation effect |
| CN102455139A (en) * | 2011-10-18 | 2012-05-16 | 张周卫 | Double-strand-flow low-temperature spiral winding pipe type heat exchanger with vacuum heat insulation function |
| CN102538388A (en) * | 2011-11-24 | 2012-07-04 | 张周卫 | Three-stream spiral wound type heat exchange equipment for secondary refrigeration and low-temperature liquefaction of LNG (liquefied natural gas) |
| CN102455113A (en) * | 2011-11-25 | 2012-05-16 | 张周卫 | Liquefied natural gas (LNG) low-temperature liquefied primary refrigerating four-stream spiral twined pipe type heat exchange equipment |
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