CN209484935U - A kind of double tower backflows double condenser/evaporator High Purity Nitrogen process units - Google Patents
A kind of double tower backflows double condenser/evaporator High Purity Nitrogen process units Download PDFInfo
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- CN209484935U CN209484935U CN201920133472.2U CN201920133472U CN209484935U CN 209484935 U CN209484935 U CN 209484935U CN 201920133472 U CN201920133472 U CN 201920133472U CN 209484935 U CN209484935 U CN 209484935U
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Abstract
It backflows double condenser/evaporator High Purity Nitrogen process units the utility model relates to a kind of double tower, described device includes ice chest and the main heat exchanger, Xia Ta, upper tower, the first condenser/evaporator, the second condenser/evaporator, the subcooler, expanding machine that are placed in the ice chest.The utility model utilizes the setting of second condenser/evaporator, is flashed by the distillation of more steps, realizes the decline of nitrogen content in oxygen rich air, provide the nitrogen recovery rate of whole system；Further through the pressure for reducing by second condenser/evaporator, it can guarantee going on smoothly for the second condenser/evaporator condensation evaporation in the case where pressure tower under not increasing, realize the raising of nitrogen recovery rate, the reduction of specific energy consumption.
Description
Technical field
The utility model relates to production high pure nitrogen field more particularly to a kind of double tower double condenser/evaporators that backflow are high-purity
Nitrogen process units.
Background technique
Currently, being obtained at low temperature using heat exchange, rectifying, positive stream or stream backed expansion, interior compression or external compression to separate air
Industrial nitrogen production technology is well-known to compressed gas product.
The common double tower method of backflowing is: air passes through compressor compresses, cools down in chilldown system and in purification system
In go out into the heat exchanger in ice chest, to be chilled near saturation temperature after the objectionable impurities such as water, carbon dioxide, acetylene, into
Enter lower tower bottom, participates in rectifying.Oxygen-enriched liquid air is obtained in lower tower bottom, after throttle valve throttles, is transported to tower, for upper tower
Liquid is provided.It is sent into condenser/evaporator in lower top of tower extraction nitrogen, exchanges heat and be condensed into liquid oxygen in condenser/evaporator
Liquid nitrogen.A part of liquid nitrogen becomes the phegma of lower tower, and another part liquid nitrogen is drawn from lower tower, few portion after liquid air subcooler is subcooled
Dividing can make to supply outside product, most of to enter upper top of tower after throttling expansion as phegma.
In upper tower bottom, what is obtained is oxygen-enriched liquid air, after the evaporator that is condensed heating, becomes oxygen rich air, a part is upper
Rectifying is participated in as uprising gas in tower, another part enters main heat exchanger re-heat to about -150 DEG C, is re-fed into swollen after being extracted
Swollen machine decompressional expansion after oxygen rich air decrease temperature and pressure, enters back into main heat exchanger cold end and participates in heat exchange.The nitrogen of upper top of tower extraction,
Liquid nitrogen of the low temperature cooling capacity to cooling lower tower extraction is recycled by subcooler, is then fed into main heat exchanger recycling cooling capacity.
Double tower equipment of backflowing can produce the nitrogen with pressure, but it is higher to be limited to oxygen content in tower bottom oxygen-enriched liquid air,
Upper tower pressure is higher, the nitrogen of following top of tower need higher pressure just and can guarantee the normal work of condenser/evaporator.Institute
It is higher with energy consumption.
Therefore, those skilled in the art is dedicated to developing the high pure nitrogen process units that the lower double tower of energy consumption backflows.
Utility model content
The purpose of this utility model is backflowed in process for double tower, needs higher lower pressure tower, and then need higher
The technical problems such as air compressor machine pressure, by the way that second condenser/evaporator is arranged, providing, which reduces double tower, backflows flow system pressure
The device of power and energy consumption.
The utility model provides a kind of double tower and backflows double condenser/evaporator High Purity Nitrogen process units, specific as follows:
The utility model provides a kind of double tower and backflows double condenser/evaporator High Purity Nitrogen process units, including ice chest and is placed in
Main heat exchanger, Xia Ta, upper tower, the first condenser/evaporator, the second condenser/evaporator, subcooler in the ice chest, first is extraneous
Pipeline is connect by the main heat exchanger with the air intlet of the lower tower bottom；The liquia air outlet of the lower tower bottom is logical
Piping is connect with the middle and lower part of the upper tower；The nitrogen outlet of the lower top of tower is condensed with described second respectively by pipeline
Evaporator upper end, first condenser/evaporator upper end connection for being set to the upper tower bottom；First condenser/evaporator
The liquid oxygen outlet of lower end, second condenser/evaporator lower end is connect by pipeline with the lower top of tower, and described first cold
The liquid oxygen outlet of solidifying evaporator lower end, second condenser/evaporator lower end is connect and is passed through with the upper top of tower by pipeline
The subcooler；The upper top of tower nitrogen outlet is connect by pipeline with the second extraneous pipeline；First condenser/evaporator
Liquid outlet connect with second condenser/evaporator by pipeline；The gas vent of second condenser/evaporator passes through pipe
Road is connect with third external world pipeline.
Further, the upper top of tower nitrogen outlet successively passes through the subcooler and the main heat exchanger by pipeline
It is connect with the described second extraneous pipeline.
It further, further include the expanding machine for running through the ice chest, the gas vent in the middle part of the main heat exchanger passes through pipe
Road is connect with the gas feed of the expanding machine, and the gas vent of the expanding machine passes through the main heat exchanger and institute by pipeline
State the connection of third external world pipeline.
Further, the gas vent in the middle part of the main heat exchanger also passes through pipeline by the main heat exchanger and described the
Three extraneous pipeline connections.
It further, further include the throttle valve in each connecting pipe.
Double condenser/evaporator High Purity Nitrogen process units the utility model has the advantages that a kind of double tower provided by the utility model backflows, it is described
The setting of second condenser/evaporator described in equipment utilization is flashed by the distillation of more steps, realizes nitrogen content in oxygen rich air
Decline, provides the nitrogen recovery rate of whole system；Further through the pressure for reducing by second condenser/evaporator, can not increase
In the case where lower pressure tower, guarantees going on smoothly for the second condenser/evaporator condensation evaporation, realize nitrogen recovery rate
It improves, the reduction of specific energy consumption.
Detailed description of the invention
Fig. 1 is that the utility model double tower backflows the structural schematic diagrams of double condenser/evaporator High Purity Nitrogen process units；
Appended drawing reference indicates explanation in description above:
1- ice chest；2- expanding machine；3- main heat exchanger；Tower under 4-；The first condenser/evaporator of 5-；The second condenser/evaporator of 6-；
The upper tower of 7-；8- subcooler；The extraneous pipeline of 9- first；The extraneous pipeline of 10- second；11- third external world pipeline.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are in the premise for not making creative work
Under every other embodiment obtained, fall within the protection scope of the utility model.
It should be noted that in the absence of conflict, the feature in the embodiments of the present invention and embodiment can
To be combined with each other.
The utility model is described in further detail in the following with reference to the drawings and specific embodiments, but not as the utility model
It limits.
It backflows double condenser/evaporator High Purity Nitrogen process units as shown in Figure 1, the utility model provides a kind of double tower, including cold
Case (1) and the main heat exchanger (3) being placed in the ice chest (1), lower tower (4), upper tower (6), the first condenser/evaporator (5), second
Condenser/evaporator, subcooler (7), the first extraneous pipeline (9) pass through the sky of the main heat exchanger (3) and lower tower (4) bottom
Gas import connection；The liquia air outlet of lower tower (4) bottom is connect by pipeline with the middle and lower part of the upper tower (6)；Institute
State nitrogen outlet at the top of lower tower (4) by pipeline respectively with the second condenser/evaporator (5) upper end, be set to the upper tower
(6) the first condenser/evaporator (5) upper end connection of bottom；First condenser/evaporator (5) lower end, second condensation
The liquid oxygen outlet of evaporator (5) lower end at the top of pipeline and the lower tower (4) by connecting, and first condenser/evaporator (5)
The liquid oxygen outlet of lower end, second condenser/evaporator (5) lower end at the top of pipeline and the upper tower (6) by connecting and by institute
State subcooler (7)；Upper tower (6) the top nitrogen outlet is connect by pipeline with the second extraneous pipeline (10)；Described first is cold
The liquid outlet of solidifying evaporator (5) is connect by pipeline with second condenser/evaporator (5)；Second condenser/evaporator
(5) gas vent is connect by pipeline with third external world pipeline (11).
In one preferred embodiment of the utility model, upper tower (6) the top nitrogen outlet is successively passed through by pipeline
The subcooler (7) and the main heat exchanger (3) are connect with the described second extraneous pipeline (10).
It further include the expanding machine (2) through the ice chest (1), the master in one preferred embodiment of the utility model
Gas vent in the middle part of heat exchanger (3) is connect by pipeline with the gas feed of the expanding machine (2), the expanding machine (2)
Gas vent is connect by the main heat exchanger (3) with third external world pipeline (11) by pipeline.
In one preferred embodiment of the utility model, the gas vent in the middle part of the main heat exchanger (3) also passes through pipeline
It is connect by the main heat exchanger (3) with third external world pipeline (11).
It further include the throttle valve in each connecting pipe in one preferred embodiment of the utility model.
It further include the throttle valve in each connecting pipe in one preferred embodiment of the utility model: liquid air throttling
Valve V1, liquid nitrogen throttle valve V2, oxygen-enriched throttle valve V3, expanding machine (2) intake valve V4, expanding machine (2) exhaust valve V5, expansion by-passing valve
V6。
The production method specific embodiment of the present embodiment equipment, comprising the following steps:
Step 1: pass through the air GA101 (20 DEG C of temperature, pressure 8barA) after the impurity such as Adsorption water, carbon dioxide
Enter the ice chest (1) by the described first extraneous pipeline (9), and by the main heat exchanger (3) be cooled to dew-point temperature (-
168 DEG C, micro-strip liquid), lower tower (4) bottom is entered, the rectifying of the lower tower (4) is participated in；
Step 2: lower tower (4) top pressure is 7.8barA.The past rising of air into lower tower (4) bottom,
And heat occurs with the liquid fallen down at the top of the lower tower (4) and exchanges；Wherein, gas (the predominantly nitrogen of light component
Gas) it gathers in gas and rises to lower tower (4) tower top, the gas (predominantly oxygen, argon gas) of heavy constituent is in a liquid
It gathers and lands to lower tower (4) tower bottom.So can be obtained at the top of the lower tower (4) pure nitrogen gas product (oxygen-containing tolerance≤
3ppm), what bottom obtained is liquid air product (the oxygen-containing tolerance: 35%~40%) rich in oxygen.Wherein, the production of rectifying operating condition
It is raw, need the liquid sprayed from top to bottom, it is also desirable to have the gas risen from bottom to top.The air of entrance is as under
Gas on and participates in rectifying, on each block of column plate, liquid can all occur and exchange with the substance of gas with heat；
Step 3: the nitrogen in lower tower (4) tower top is pumped by pipeline from the nitrogen outlet at the top of the lower tower (4)
It liquefies into first condenser/evaporator (5), second condenser/evaporator (5), and in its condensation side；Described first is cold
The evaporation side of solidifying evaporator (5), second condenser/evaporator (5) is all the liquid of upper tower (6) bottom, and is all oxygen-enriched
Liquid, wherein first condenser/evaporator (5) is arranged in upper tower (6) bottom, and upper tower (6) bottom liquid is oxygen-containing
Gas (59.8%) concentration is slightly lower；First condenser/evaporator (5) is separately provided, and oxygen-containing gas concentration is slightly higher (81.3%).Pass through
Control the certain pressure difference of tower (4) up and down, cause boiling point difference, make the temperature of condensation side be higher than evaporation side (it is usually high by 1~
1.5 DEG C), only in this way, heat can be just transmitted to evaporation side by condensation side, and condenser/evaporator can just work.
Step 4: the liquid nitrogen that first condenser/evaporator (5), the second condenser/evaporator (5) condensation side flow out converges
One liquid nitrogen is synthesized, a part of liquid nitrogen of this strand of liquid nitrogen enters lower tower (4) tower top by pipeline and forms in the step 1
The liquid fallen down participates in the rectifying of the lower tower (4) again；Another part liquid nitrogen is dropped from LN-205 by the subcooler (7)
Mildly using upper tower (6) tower top is conveyed after liquid nitrogen throttle valve V2 expenditure and pressure, upper tower (6) base falls described in term by term combination are joined
With the rectifying of the upper tower (6)；
Step 5: the pressure that upper tower (6) rectifying accumulates at the top of the upper tower (6) is -183.2 DEG C, 3.6barA
Low temperature nitrogen by the nitrogen outlet at the top of the upper tower (6) from GN-210 by the subcooler (7) recycle low temperature cooling capacity,
It is re-fed into the main heat exchanger (3) re-heat, the ice chest (1) is finally sent out and is exported to the second extraneous pipeline (10)；
Step 6: the oxygen enriched liquid of lower tower (4) bottom is exported by the liquid nitrogen of lower tower (4) bottom, from LA-
103 are sent to conveying upper tower (6) middle and lower part after liquid air throttle valve V1.1 decompression cooling, participate in the essence of the upper tower (6)
It evaporates；Meanwhile the gas that first condenser/evaporator (5) evaporation side of the setting in Shang Ta (6) bottom generates, to the upper tower
(6) top rises the rectifying for participating in the upper tower (6).According to user demand, upper tower (6) top pressure is 3.6barA.Setting exists
The gas that first condenser/evaporator (5) evaporation side generates participates on described as uprising gas needed for upper tower (6) rectifying
Tower (6) rectifying.
Step 7: logical from LRO-301 after the liquid of the first condenser/evaporator (5) bottom is extracted out by liquid outlet
It crosses oxygen-enriched throttle valve V3 and is sent into second condenser/evaporator (5) through decompression；
Step 8: the gas that the second condenser/evaporator (5) evaporation side evaporation generates enters institute by pipeline GRO-302
Main heat exchanger (3) first time re-heat is stated to -140 DEG C, and extract out in the middle part of the main heat exchanger (3), from GRO-303 by expanding
Machine intake valve V4 is sent into 2 expanding machines (2) expansion and is depressurized to 1.3barA (- 163.3 DEG C), then passes through expander exhaust gas from GRO-305
Valve V5 enters back into the main heat exchanger (3) cold end, second of re-heat to after 17 DEG C from GRO-306 send out the ice chest (1) to
Third external world pipeline (11) output.
In addition, the safety in order to guarantee the expanding machine (2), it will usually which by-passing valve V6 is to adjust expansion gas for setting expansion
The scale of construction.Its specifically: the gas that the second condenser/evaporator (5) evaporation side evaporation generates enters institute by pipeline GRO-302
Main heat exchanger (3) first time re-heat is stated to -140 DEG C, and extract out in the middle part of the main heat exchanger (3), from GRO-303 by expanding
By-passing valve V6 enters (3) second of re-heat of main heat exchanger and sends out ice chest (1) Xiang Suoshu the from GRO-306 to after 17 DEG C
Three extraneous pipelines (11) export.
The oxygen enriched liquid of upper tower (6) bottom is when entering the second condenser/evaporator (5), more step distillations
(flash distillation), so, the liquid oxygen concentration in second condenser/evaporator (5) is higher, can achieve 81.3%, as useless
The gas of gas discharge, oxygen content is also higher (to be improved by the backflow discharge exhaust gas oxygen content 46.2% of method of double tower under the prior art
To the discharge exhaust gas oxygen content 59.8% of the utility model), it (is backflowed the row of method by double tower under the prior art containing nitrogen amount is lower
Put the discharge exhaust gas nitrogen content 37.6% that exhaust gas nitrogen content 51.7% is reduced to the utility model), then input same air amount feelings
The high pure nitrogen yield of the utility model can be higher under condition.In order to guarantee the temperature difference of second condenser/evaporator (5) still
Within 1~1.5 DEG C, the pressure of the second condenser/evaporator (5) evaporation side need to be reduced.Do not change the upper tower (6), under
It is ingenious using the pressure for increasing step distillation and reducing by second condenser/evaporator (5) in the case where tower (4) pressure more, it is real
The raising of existing nitrogen recovery rate.
The utility model has the advantages that flashed using the setting of the second condenser/evaporator by the distillation of more steps, it is real
The decline of nitrogen content, provides the nitrogen recovery rate of whole system in existing oxygen rich air；Further through the second condenser/evaporator of reduction
Pressure can guarantee going on smoothly for the second condenser/evaporator condensation evaporation, realize nitrogen in the case where pressure tower under not increasing
The raising of gas recovery rate, the reduction of specific energy consumption.
Specific embodiment of the utility model is described in detail above, but it is merely an example, this is practical new
Type is not restricted to particular embodiments described above.To those skilled in the art, any pair of the utility model carries out
Equivalent modifications and substitution also all among the scope of the utility model.Therefore, in the spirit and model for not departing from the utility model
Lower made equal transformation and modification are enclosed, should all be covered in the scope of the utility model.
Claims (5)
- Double condenser/evaporator High Purity Nitrogen process units 1. a kind of double tower backflows, which is characterized in that including ice chest (1) and be placed in described Main heat exchanger (3), lower tower (4), upper tower (7), the first condenser/evaporator (5), the second condenser/evaporator (6), mistake in ice chest (1) Cooler (8), the first extraneous pipeline (9) connect by the main heat exchanger (3) with the air intlet of lower tower (4) bottom；Institute The liquia air outlet for stating lower tower (4) bottom is connect by pipeline with the middle and lower part of the upper tower (7)；At the top of the lower tower (4) Nitrogen outlet by pipeline respectively with the second condenser/evaporator (6) upper end, be set to the described of upper tower (7) bottom The connection of first condenser/evaporator (5) upper end；First condenser/evaporator (5) lower end, second condenser/evaporator (6) lower end Liquid oxygen outlet connect by pipeline with lower tower (4) top, and first condenser/evaporator (5) lower end, described second The liquid oxygen outlet of condenser/evaporator (6) lower end at the top of pipeline and the upper tower (7) by connecting and passing through the subcooler (8)； Upper tower (7) the top nitrogen outlet is connect by pipeline with the second extraneous pipeline (10)；First condenser/evaporator (5) Liquid outlet is connect by pipeline with second condenser/evaporator (6)；The gas vent of second condenser/evaporator (6) is logical Piping is connect with third external world pipeline (11).
- Double condenser/evaporator High Purity Nitrogen process units 2. double tower according to claim 1 backflows, which is characterized in that on described The subcooler (8) and the main heat exchanger (3) and second external world are successively passed through by pipeline in the outlet of tower (7) top nitrogen Pipeline (10) connection.
- Double condenser/evaporator High Purity Nitrogen process units 3. double tower according to claim 1 backflows, which is characterized in that further include Expanding machine (2) through the ice chest (1), the gas vent in the middle part of the main heat exchanger (3) pass through pipeline and the expanding machine (2) gas feed connection, the gas vent of the expanding machine (2) is by pipeline by the main heat exchanger (3) and described the Three extraneous pipelines (11) connect.
- Double condenser/evaporator High Purity Nitrogen process units 4. double tower according to claim 1 backflows, which is characterized in that the master Gas vent in the middle part of heat exchanger (3) also passes through pipeline and connects by the main heat exchanger (3) and third external world pipeline (11) It connects.
- Double condenser/evaporator High Purity Nitrogen process units 5. double tower according to claim 1 backflows, which is characterized in that further include Throttle valve in each connecting pipe.
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| CN109631493A (en) * | 2019-01-25 | 2019-04-16 | 上海联风能源科技有限公司 | A kind of double tower backflows double condenser/evaporator High Purity Nitrogen process units and its production method |
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| CN109631493A (en) * | 2019-01-25 | 2019-04-16 | 上海联风能源科技有限公司 | A kind of double tower backflows double condenser/evaporator High Purity Nitrogen process units and its production method |
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