Energy-saving and consumption-reducing nitrogen production system

Abstract

The utility model discloses an energy-saving and consumption-reducing nitrogen production system which comprises an air filter, an air compressor, an air cooling tower, a first molecular sieve, a second molecular sieve, an electric furnace, a fractionating tower and a heat exchanger, the air filter is connected with the air compressor, and the output end of the air compressor is connected with the high-temperature gas input end of the heat exchanger; the low-temperature gas input end of the heat exchanger is connected with the fractionating tower, the high-temperature gas output end of the heat exchanger is connected with the air cooling tower, the low-temperature gas output end of the heat exchanger is connected with the electric furnace, the first molecular sieve is connected with the second molecular sieve, and the air cooling tower is connected with the first molecular sieve and the second molecular sieve through pipelines. The fractionating tower is connected with the first molecular sieve and the second molecular sieve through pipelines, and the second molecular sieve is connected with the electric furnace. According to the utility model, the electric quantity consumption of the electric furnace is reduced, the electric quantity consumption of the air cooling tower is reduced, the service life of the binding post is prolonged, and unnecessary consumption is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to nitrogen production technical field, concretely relates to a nitrogen production system of energy -conserving and consumption -reducing. BACKGROUND

[0002] In the field of producing nitrogen by air separation, the dirty nitrogen gas as the molecular sieve regeneration gas will enter the molecular sieve from the fractionating column, and the temperature of the dirty nitrogen gas from the fractionating column cannot reach the use requirement of the molecular sieve, so the dirty nitrogen gas is generally heated by the electric furnace before entering the molecular sieve, the electric furnace has high power consumption, the electric furnace terminal post is burnt out and virtually connected due to the entry of the humid air, the service life of the terminal post is short, the temperature of the dirty nitrogen gas cannot reach the use requirement, and the loss is large. SUMMARY

[0003] In order to overcome the above-mentioned deficiencies of the prior art, the utility model provides a nitrogen production system of energy -conserving and consumption -reducing.

[0004] The technical scheme adopted by the utility model is: a nitrogen production system of energy -conserving and consumption -reducing, including air filter, air compressor, air cooling tower, molecular sieve No. 1, molecular sieve No. 2, electric furnace, fractionating column and heat exchanger, the air filter is connected with air compressor, the output end of the air compressor is connected with the high-temperature gas input end of the heat exchanger, the low-temperature gas input end of the heat exchanger is connected with the fractionating column, the high-temperature gas output end of the heat exchanger is connected with the air cooling tower, the low-temperature gas output end of the heat exchanger is connected with the electric furnace, the molecular sieve No. 1 is connected with the molecular sieve No. 2, the air cooling tower is connected with molecular sieve No. 1 and molecular sieve No. 2 through the pipeline, the fractionating column is connected with molecular sieve No. 1 and molecular sieve No. 2 through the pipeline, the molecular sieve No. 2 is connected with the electric furnace;

[0005] Further, the electric furnace is provided with a terminal box, a terminal post is arranged in the terminal box, the terminal post is used for the electric connection of the electric furnace, an overhaul opening is arranged on the terminal box, the overhaul opening is provided with an overhaul cover, a sealing strip is arranged on the overhaul cover, an air inlet is arranged on the terminal box, the air inlet is connected with the fractionating column, an electric valve is arranged on the pipeline connected with the fractionating column, the terminal box is provided with an air pressure sensor, the air pressure sensor is connected with a controller, and the controller is connected with the electric valve.

[0006] Further, the heat exchanger adopts a plate type heat exchanger.

[0007] Further, the pipeline connected with the heat exchanger and the electric furnace is provided with a heat preservation layer, so that the heat loss of the dirty nitrogen gas after heat exchange is reduced.

[0008] The utility model discloses a heat exchanger is set up with the high temperature air of compressor and the low temperature dirty nitrogen gas of fractionating column carries out heat exchange, improves the temperature of dirty nitrogen gas into electric furnace, reduces electric furnace power consumption, reduces the temperature of compressed air into air cooling tower simultaneously, reduced the power consumption of air cooling tower, through setting up the terminal box of electric furnace terminal post and connecting terminal box with fractionating column, nitrogen gas in fractionating column is passed into terminal box, makes terminal box keep a slight positive pressure state, avoids humid air and terminal post contact, prolongs the service life of terminal post, guarantees the normal work of electric furnace, avoids unnecessary consumption. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 It is the schematic diagram of connection structure of the utility model.

[0010] Figure 2 It is the nitrogen gas control schematic diagram of terminal box of the utility model.

[0011] Figure 3 It is the schematic diagram of terminal box structure of the utility model.

[0012] In the drawing: 1. air filter, 2. air compressor, 3. air cooling tower, 4. one molecular sieve, 5. two molecular sieves, 6. electric furnace, 7. fractionating column, 8. heat exchanger, 9. terminal box, 901. access hole, 902. access cover, 903. air inlet, 10. air pressure sensor, 11. electric valve, 12. controller. DETAILED DESCRIPTION

[0013] In order to more clearly understand the technical scheme of the utility model, the utility model is further explained below in conjunction with the drawings.

[0014] As Figure 1 Shown, an energy-saving nitrogen production system, including air filter 1, air compressor 2, air cooling tower 3, one molecular sieve 4, two molecular sieves 5, electric furnace 6, fractionating column 7 and heat exchanger 8, air filter 1 is connected with air compressor 2, the output end of air compressor is connected with the high temperature gas input end of heat exchanger 8, the low temperature gas input end of heat exchanger 8 is connected with fractionating column 7, the high temperature gas output end of heat exchanger 8 is connected with air cooling tower 3, the low temperature gas output end of heat exchanger 8 is connected with electric furnace 6, one molecular sieve 4 is connected with two molecular sieves 5, air cooling tower 3 is connected with one molecular sieve 4, two molecular sieves 5 through pipeline, fractionating column 7 is connected with one molecular sieve 4, two molecular sieves 5 through pipeline, two molecular sieves 5 are connected with electric furnace 6;

[0015] Preferably, the electric furnace 6 is provided with a junction box 9, the junction box 9 is provided with a terminal post for electric connection of the electric furnace 6, the junction box 9 is provided with an access hole 901, the access hole 901 is provided with an access cover 902, the access cover 902 is provided with a sealing strip, the junction box 9 is provided with an air inlet 903, the air inlet 903 is connected with the fractionating tower 7, the pipeline connected with the fractionating tower 7 is provided with an electric valve 11, the junction box 9 is provided with an air pressure sensor 10, the air pressure sensor 10 is connected with a controller 12, the controller 12 is connected with the electric valve 11;

[0016] Preferably, the heat exchanger 8 adopts a plate heat exchanger, the plate heat exchanger has high heat exchange efficiency, is simple and convenient to clean and maintain, and has relatively large heat exchange area.

[0017] Preferably, the pipeline connected with the electric furnace 6 of the heat exchanger 8 is provided with a heat preservation layer, so as to reduce heat loss of the heat exchanged polluted nitrogen gas.

[0018] Working principle: air enters the air compressor 2 after the air filter 1, high-temperature air treated by the air compressor 2 enters the heat exchanger 8 and exchanges heat with low-temperature polluted nitrogen gas entering the heat exchanger 8 from the fractionating tower 7, the compressed air after heat exchange enters the air cooling tower 3 for cooling, the polluted nitrogen gas after heat exchange enters the electric furnace 6 for heating, the polluted nitrogen gas after heating of the electric furnace 6 reaches the required temperature and enters the second molecular sieve 5 as regenerated gas, and a small amount of nitrogen gas in the fractionating tower 7 enters the junction box 9 through the pipeline, when the pressure value in the junction box 9 rises to a set value, the air pressure sensor 10 arranged on the junction box 9 transmits a signal to the controller 12, the controller 12 controls the electric valve 11 to close, when the pressure in the junction box 9 drops to a set value, the air pressure sensor 10 transmits a signal to the controller 12, the controller 12 controls the electric valve 11 to open to continue to flush nitrogen gas to the junction box 9, so that the junction box 9 always maintains a slight positive pressure.

[0019] The above only describes preferred embodiments of the present application, and equivalent changes or modifications made according to the structure, features and principles of the present application patent application range are included in the present application patent application range.

Claims

1. An energy-saving and cost-reducing nitrogen production system, comprising an air filter, an air compressor, an air cooling tower, a first molecular sieve, a second molecular sieve, an electric furnace and a fractional distillation column, characterized in that, The heat exchanger is further provided, the air filter is connected with the air compressor, the output end of the air compressor is connected with the high-temperature gas input end of the heat exchanger, the low-temperature gas input end of the heat exchanger is connected with the fractionating tower, the high-temperature gas output end of the heat exchanger is connected with the air cooling tower, the low-temperature gas output end of the heat exchanger is connected with the electric furnace, the first molecular sieve is connected with the second molecular sieve, the air cooling tower is connected with the first molecular sieve and the second molecular sieve through pipelines, the fractionating tower is connected with the first molecular sieve and the second molecular sieve through pipelines, and the second molecular sieve is connected with the electric furnace.

2. The energy-saving and cost-reducing nitrogen production system according to claim 1, characterized in that, The electric furnace is provided with a terminal box, a terminal post is arranged in the terminal box, the terminal post is used for electric connection of the electric furnace, an inspection opening is arranged on the terminal box, the inspection opening is provided with an inspection cover, a sealing strip is arranged on the inspection cover, an air inlet is arranged on the terminal box, the air inlet is connected with the fractionating tower, an electric valve is arranged on a pipeline connected with the fractionating tower, the terminal box is provided with an air pressure sensor, the air pressure sensor is connected with a controller, and the controller is connected with the electric valve.

3. The energy-saving and cost-reducing nitrogen production system according to claim 1, characterized in that, The heat exchanger is a plate heat exchanger.

4. The energy-saving and cost-reducing nitrogen production system according to claim 1, characterized in that, A heat preservation layer is arranged on a pipeline connected with the electric furnace.

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