Nitrogen making machine convenient to maintain and use in low-temperature environment and use method of nitrogen making machine

Abstract

The invention relates to the technical field of nitrogen making machines, in particular to a nitrogen making machine convenient to maintain and use in a low-temperature environment and a using method of the nitrogen making machine. The heating assembly comprises a heat source, a partition plate, a connecting pipe, a waste heat recovery pipe and an exhaust pipe, hot air generated by the heat source can be preferentially blown to the double-tower nitrogen-making equipment, then the hot air enters the maintaining cavity through the hot air flow channel to conduct auxiliary heating on other equipment in the nitrogen-making assembly, and finally the hot air cooled in the maintaining cavity enters the waste heat recovery pipe through the connecting pipe to conduct auxiliary heating on the other equipment in the nitrogen-making assembly. The interior of the waste heat recovery pipe is hollow, the waste heat recovery pipe preheats air in the air inlet pipe in a convective heat exchange mode, and low-temperature air obtained after heat exchange is completed is exhausted out of the box body through the exhaust pipe.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of nitrogen making machine, and particularly relates to a nitrogen making machine convenient to maintain and use in a low-temperature environment and a use method thereof. BACKGROUND

[0002] In modern industrial production, nitrogen is a commonly used inert gas, which is widely used in many fields. In the process of nitrogen preparation, pressure swing adsorption (PSA) nitrogen making equipment has been widely used due to its on-site nitrogen making, high nitrogen making efficiency, low cost and other characteristics. The PSA nitrogen making equipment uses compressed air as raw material, adopts two adsorption towers filled with molecular sieve, and the two adsorption towers work alternately. The principle of pressurized adsorption and depressurized desorption is used to produce high-purity nitrogen by adsorbing oxygen with molecular sieve. The existing nitrogen making equipment is of an open structure and is used after being installed on site. The on-site installation often has problems such as long time consumption and high installation cost, and it is not very suitable for low-temperature environment and is not suitable for long-term work in low-temperature environment.

[0003] The prior art CN213326739U discloses a nitrogen making machine suitable for running in a low-temperature environment, which comprises a sealed container. The container is provided with a compressed air inlet. The compressed air inlet is connected with a cold dryer, a dust fine filter, an air storage tank, a double-tower nitrogen making equipment and a nitrogen storage tank through pipelines in sequence. The nitrogen storage tank is provided with a nitrogen sampling pipe, a waste nitrogen vent pipe and a finished nitrogen outlet at the rear end. The container is also provided with an electric heating fan. The nitrogen making machine has the characteristics of compact structure, convenient use and no need for on-site installation, and can be widely used in various low-temperature environments.

[0004] The above-mentioned patent heats the entire container space by the electric heating fan. Although the environmental temperature in the container can be improved, the energy consumption is high, and the heat energy utilization efficiency is low. A large amount of heat is consumed for heating non-core equipment and empty space. Meanwhile, the inlet pipeline cannot be heated, which affects the stable operation of the equipment. SUMMARY

[0005] The present application aims to provide a nitrogen making machine convenient to maintain and use in a low-temperature environment and a use method thereof, which solves the problem of low heat energy utilization efficiency of the existing nitrogen making machine suitable for running in a low-temperature environment and the problem that the inlet pipeline cannot be heated.

[0006] In order to achieve the above object, the application provides a nitrogen generator convenient for maintenance and use in low-temperature environment, which comprises a box body, a nitrogen generating assembly, an air inlet pipe and an air outlet pipe, the nitrogen generating assembly is arranged in the box body, the air inlet pipe and the air outlet pipe are installed on the left and right sides of the box body and communicate with the nitrogen generating assembly, and the nitrogen generator further comprises a heating assembly; the heating assembly comprises a heat source, a partition plate, a connecting pipe, a waste heat recovery pipe and an exhaust pipe, the heat source is fixedly connected with the box body and located in the box body, the partition plate is fixedly connected with the box body and located in the box body, a hot air flow channel is formed between the partition plate and the top wall of the box body, the waste heat recovery pipe is fixedly connected with the air inlet pipe and sleeved on the air inlet pipe, the connecting pipe is connected with the box body and the waste heat recovery pipe, and the two ends of the connecting pipe communicate with the box body and the waste heat recovery pipe respectively, and the exhaust pipe is fixedly connected with the waste heat recovery pipe and communicates with the waste heat recovery pipe.

[0007] The heating assembly further comprises a first heat preservation layer, the first heat preservation layer is fixedly connected with the box body and located on the inner side of the box body.

[0008] The heating assembly further comprises a temperature sensor, the temperature sensor is fixedly connected with the box body and located in the box body.

[0009] The heating assembly further comprises a second heat preservation layer and a protective shell, the second heat preservation layer is fixedly connected with the waste heat recovery pipe and sleeved on the waste heat recovery pipe, and the protective shell is connected with the second heat preservation layer and sleeved on the second heat preservation layer.

[0010] The exhaust pipe comprises a pipe body and a mesh cover, the pipe body is fixedly connected with the waste heat recovery pipe and communicates with the waste heat recovery pipe, and the mesh cover is fixedly connected with the pipe body and located at one end of the pipe body away from the waste heat recovery pipe.

[0011] The exhaust pipe further comprises a check valve, the check valve is rotationally connected with the pipe body and located in the pipe body.

[0012] On the other hand, the application further comprises a use method of the nitrogen generator convenient for maintenance and use in low-temperature environment, which comprises the following steps: Start the heat source, make hot air preferentially enter the core heating cavity, and heat the double-tower nitrogen generating equipment; The hot air enters the maintenance cavity through the hot air flow channel, and assists in heating other equipment in the nitrogen generating assembly; The hot air in the maintenance cavity is introduced into the waste heat recovery pipe through the connecting pipe, and preheats the air in the air inlet pipe; The gas after heat exchange is discharged through the exhaust pipe.

[0013] The nitrogen generator and the use method thereof are convenient for maintenance and use in a low-temperature environment, the partition plate separates the box into a core heating cavity and a maintaining cavity, the heat source and the double-tower nitrogen generating equipment are located in the core heating cavity, the hot air flow channel is located at the top of the core heating cavity, so that the hot air generated by the heat source can be blown to the double-tower nitrogen generating equipment first, then the hot air enters the maintaining cavity through the hot air flow channel, and other equipment in the nitrogen generating assembly is assisted to be heated, finally, the hot air after the maintaining cavity is cooled enters the waste heat recovery pipe through the connecting pipe, the waste heat recovery pipe is hollow inside, the waste heat recovery pipe preheats the air in the air inlet pipe through a convection heat exchange mode, the low-temperature gas after heat exchange is discharged to the outside of the box through the exhaust pipe, the hot air generated by the heat source of the present application directly heats the double-tower nitrogen generating equipment located in the core heating cavity first, then flows through the maintaining cavity to assist the heating of the remaining equipment, and finally the waste heat preheats the air inlet through the waste heat recovery pipe sleeved outside the air inlet pipe, which ensures the stable operation of the nitrogen generating equipment in the low-temperature environment, significantly reduces the energy consumption, and effectively prevents the air inlet pipe from icing and the performance of the adsorption tower from being reduced. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced.

[0015] Figure 1 is the overall structure schematic diagram of the nitrogen generator convenient for maintenance and use in a low-temperature environment of the first embodiment of the present application.

[0016] Figure 2 is the structure schematic diagram of the heating assembly of the first embodiment of the present application.

[0017] Figure 3 is the installation structure schematic diagram of the spiral blade of the second embodiment of the present application. Figure 2 is the enlarged view of A of the nitrogen generator convenient for maintenance and use in a low-temperature environment.

[0018] Figure 4 is the installation structure schematic diagram of the spiral blade of the second embodiment of the present application.

[0019] Figure 5 is the flow chart of the use method of the nitrogen generator convenient for maintenance and use in a low-temperature environment of the present application.

[0020] In the figure: 101-box, 102-nitrogen making assembly, 103-air inlet pipe, 104-air outlet pipe, 105-access door, 106-heating assembly, 107-heat source, 108-baffle, 109-connection pipe, 110-heat recovery pipe, 111-exhaust pipe, 112-core heating cavity, 113-maintenance cavity, 114-hot air flow channel, 115-temperature sensor, 116-second heat preservation layer, 117-protection shell, 118-first heat preservation layer, 119-electric heating tape, 201-hollow pipe, 202-spiral blade, 203-pipe body, 204-net cover, 205-check valve. DETAILED DESCRIPTION

[0021] The embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, the embodiments described below by referring to the accompanying drawings are exemplary, and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0022] First embodiment: Please refer to Figures 1 to 3 , wherein Figure 1 is the overall structure diagram of the nitrogen making machine for maintenance use in low temperature environment, Figure 2 is the structure diagram of the heating assembly, Figure 3 is Figure 2 the enlarged view of A of

[0023] The present application provides a nitrogen making machine for maintenance use in low temperature environment and a use method thereof, comprising a box 101, a nitrogen making assembly 102, an air inlet pipe 103, an air outlet pipe 104 and a heating assembly 106, the heating assembly 106 comprises a heat source 107, a baffle 108, a connection pipe 109, a heat recovery pipe 110, an exhaust pipe 111, a first heat preservation layer 118, a second heat preservation layer 116, a protection shell 117 and a temperature sensor 115, the outside air is heated by the heat source 107 and the hot air is blown into the core heating cavity 112, first, the double-tower nitrogen making equipment in the nitrogen making assembly 102 is heated, then the hot air enters the maintenance cavity 113 through the hot air flow channel 114 to assist the heating of other equipment, finally the hot air enters the heat recovery pipe 110 through the connection pipe 109 to heat the air inside the air inlet pipe 103, it can be understood that the foregoing scheme can be used to improve the heating effect of the nitrogen making machine.

[0024] For this specific embodiment, the nitrogen making assembly 102 is arranged inside the box 101, the box 101 is provided with an access door 105 on the side, through which the staff can conveniently maintain and overhaul the nitrogen making assembly 102 inside the box 101, the air inlet pipe 103 and the air outlet pipe 104 are installed on the left and right sides of the box 101 and communicate with the nitrogen making assembly 102, the nitrogen making assembly 102 mainly comprises an air compressor, a cold dryer, a dust fine filter, an air storage tank, a double-tower nitrogen making device and a nitrogen storage tank, the air inlet pipe 103 communicates with the air compressor, the air outlet pipe 104 communicates with the air storage tank, and the structure and working principle of the nitrogen making assembly 102 are prior art and will not be described in detail here.

[0025] The heat source 107 is fixedly connected with the box 101 and located inside the box 101, the partition plate 108 is fixedly connected with the box 101 and located inside the box 101, and the hot air flow channel 114 is formed between the partition plate 108 and the top wall of the box 101, the waste heat recovery pipe 110 is fixedly connected with the air inlet pipe 103 and sleeved on the air inlet pipe 103, the connecting pipe 109 is connected with the box 101 and the waste heat recovery pipe 110, and the two ends of the connecting pipe 109 respectively communicate with the box 101 and the waste heat recovery pipe 110, and the exhaust pipe 111 is fixedly connected with the waste heat recovery pipe 110 and communicates with the waste heat recovery pipe 110.

[0026] The heat source 107 is a heating device such as a heater or a PTC heater, the partition plate 108 divides the box 101 into a core heating cavity 112 and a maintenance cavity 113, the heat source 107 and the double-tower nitrogen making device are located in the core heating cavity 112, the hot air flow channel 114 is located at the top of the core heating cavity 112, so that the hot air generated by the heat source 107 can be preferentially blown to the double-tower nitrogen making device, then the hot air enters the maintenance cavity 113 through the hot air flow channel 114, and other devices in the nitrogen making assembly 102 are assisted to heat, finally, the hot air cooled in the maintenance cavity 113 enters the waste heat recovery pipe 110 through the connecting pipe 109, the waste heat recovery pipe 110 is hollow inside, the waste heat recovery pipe 110 preheats the air in the air inlet pipe 103 through a convection heat exchange mode, and the low-temperature gas after heat exchange is discharged to the outside of the box 101 through the air outlet pipe 111, the hot air generated by the heat source 107 of the application preferentially directly heats the double-tower nitrogen making device located in the core heating cavity 112, then flows through the maintenance cavity 113 to assist the heating of the remaining devices, and finally the waste heat preheats the air through the waste heat recovery pipe 110 sleeved outside the air inlet pipe 103, which ensures the stable operation of the nitrogen making device in a low-temperature environment, significantly reduces energy consumption, and effectively prevents the air inlet pipe 103 from icing and the performance of the adsorption tower from being reduced.

[0027] Secondly, the first heat preservation layer 118 is fixedly connected with the box 101 and located inside the box 101, the first heat preservation layer 118 is used for reducing the heat loss of the box 101 to the external environment, and the temperature stability of the box 101 is reduced.

[0028] Meanwhile, the temperature sensor 115 is fixedly connected with the box 101 and located inside the box 101, the temperature sensor 115 is used for detecting the temperature inside the box 101, an electric heat tracing band 119 is wound on the outer wall of the adsorption tower of the double-tower nitrogen making device, and the electric heat tracing band 119 is in signal connection with the temperature sensor 115; when the temperature sensor 115 detects that the temperature in the core heating cavity 112 is lower than a set threshold value, the electric heat tracing band 119 is started to control to assist the heating of the adsorption tower, so as to avoid the problems of the carbon molecular sieve adsorption capacity in the adsorption tower being reduced and the adsorption efficiency being reduced due to too low temperature.

[0029] In addition, the second heat preservation layer 116 is fixedly connected with the waste heat recovery pipe 110 and is sleeved on the waste heat recovery pipe 110; the protective shell 117 is connected with the second heat preservation layer 116 and is sleeved on the second heat preservation layer 116; the second heat preservation layer 116 and the first heat preservation layer 118 are both made of ceramic fiber cotton, which can prevent heat loss of the waste heat recovery pipe 110; meanwhile, the protective shell 117 is made of galvanized aluminum plate and is used for protecting the waste heat recovery pipe 110; the surface of the connecting pipe 109 is also provided with a heat preservation layer (not shown in the figure) for reducing heat loss of hot air in the process of being conveyed to the waste heat recovery pipe 110 through the conveying pipe.

[0030] Second embodiment: On the basis of the first embodiment, please refer to Figure 4 , Figure 4 is a schematic view of the mounting structure of the spiral blade of the second embodiment, the waste heat recovery pipe 110 of the embodiment includes a hollow pipe 201 and a spiral blade 202, and the exhaust pipe 111 includes a pipe body 203, a mesh cover 204 and a check valve 205.

[0031] For the specific embodiment, the hollow pipe 201 is fixedly connected with the air inlet pipe 103 and the second heat preservation layer 116 and is sleeved on the air inlet pipe 103; the spiral blade 202 is fixedly connected with the hollow pipe 201 and is located inside the hollow pipe 201; the hollow pipe 201 is hollow, and the spiral blade 202 is spiral-shaped; when hot air flows through the inside of the hollow pipe 201, the spiral blade 202 forces the hot air to move along a spiral path, prolongs the flow path and residence time of the hot air in the hollow pipe 201, and improves the preheating efficiency of the air inlet pipe 103.

[0032] Among them, the pipe body 203 is fixedly connected with the waste heat recovery pipe 110 and communicates with the waste heat recovery pipe 110; the mesh cover 204 is fixedly connected with the pipe body 203 and is located at one end of the pipe body 203 away from the waste heat recovery pipe 110; the mesh cover 204 is fixedly connected with the exhaust port of the pipe body 203 through threads, which is used for preventing foreign matters or insects from entering.

[0033] Secondly, the check valve 205 is rotationally connected with the pipe body 203 and is located inside the pipe body 203; the check valve 205 is installed at the position close to the port inside the pipe body 203, which can effectively prevent external cold air from backflowing and avoid condensation in the waste heat recovery pipe 110.

[0034] The nitrogen making machine convenient for maintenance and use in low temperature environment, the heat source 107 generates hot air after starting, the hot air first enters the core heating cavity 112, and the double-tower nitrogen making equipment is directly heated; then the hot air enters the maintenance cavity 113 through the hot air flow channel 114 at the top, and the air storage tank and other equipment are assisted to heat; the low-temperature hot air after completing the heating in the box is introduced into the waste heat recovery pipe 110 through the connecting pipe 109, the low-temperature air in the air inlet pipe 103 is preheated through the internal spiral blade 202 to prolong the heat exchange path; finally, the gas after completing the heat exchange is discharged through the exhaust pipe 111, and in the process, the temperature sensor 115 monitors the temperature of the core heating cavity 112 in real time, and when the temperature is lower than the set threshold, the electric heat tracing band 119 outside the adsorption tower is automatically started to supplement the heating, so that the heat energy efficiency is maximized and the system is stably operated.

[0035] In another aspect, referring to Figure 5 , Figure 5 is a flowchart of the use method of the nitrogen making machine convenient for maintenance and use in low temperature environment.

[0036] The application also includes a use method of the nitrogen making machine convenient for maintenance and use in low temperature environment, comprising the following steps: S101: start the heat source, make the hot air preferentially enter the core heating cavity, and heat the double-tower nitrogen making equipment; S102: the hot air enters the maintenance cavity through the hot air flow channel, and other equipment in the nitrogen making assembly is assisted to heat; S103: the hot air in the maintenance cavity is introduced into the waste heat recovery pipe through the connecting pipe, and the air in the air inlet pipe is preheated; S104: the gas after completing the heat exchange is discharged through the exhaust pipe.

[0037] The above disclosure is only one or more preferred embodiments of the application, and cannot limit the scope of the rights of the application, and those skilled in the art can understand that all or part of the above-mentioned embodiments are implemented, and equivalent changes are made according to the claims of the application, which still belongs to the scope covered by the application.

Claims

1. A nitrogen generator that is easy to maintain and use in low-temperature environments, comprising a housing, a nitrogen generating component, an inlet pipe, and an outlet pipe, wherein the nitrogen generating component is disposed inside the housing, and the inlet pipe and the outlet pipe are installed on the left and right sides of the housing and communicate with the nitrogen generating component, characterized in that, It also includes heating components; The heating assembly includes a heat source, a partition, a connecting pipe, a waste heat recovery pipe, and an exhaust pipe. The heat source is fixedly connected to the housing and located inside the housing. The partition is fixedly connected to the housing and located inside the housing, and a hot air flow channel is formed between the partition and the top wall of the housing. The waste heat recovery pipe is fixedly connected to the air inlet pipe and is sleeved on the air inlet pipe. The connecting pipe is connected to the housing and the waste heat recovery pipe, and both ends of the connecting pipe are respectively connected to the housing and the waste heat recovery pipe. The exhaust pipe is fixedly connected to the waste heat recovery pipe and is connected to the waste heat recovery pipe.

2. The nitrogen generator as described in claim 1, which is easy to maintain and use in low-temperature environments, is characterized in that... The heating assembly also includes a first insulation layer, which is fixedly connected to the housing and located inside the housing.

3. The nitrogen generator as described in claim 1, which is easy to maintain and use in low-temperature environments, is characterized in that... The heating assembly also includes a temperature sensor, which is fixedly connected to the housing and located inside the housing.

4. The nitrogen generator as described in claim 1, which is easy to maintain and use in low-temperature environments, is characterized in that... The heating assembly further includes a second insulation layer and a protective shell. The second insulation layer is fixedly connected to the waste heat recovery pipe and is sleeved on the waste heat recovery pipe. The protective shell is connected to the second insulation layer and is sleeved on the second insulation layer.

5. The nitrogen generator as described in claim 1, which is easy to maintain and use in low-temperature environments, is characterized in that... The exhaust pipe includes a pipe body and a mesh cover. The pipe body is fixedly connected to and communicates with the waste heat recovery pipe. The mesh cover is fixedly connected to the pipe body and is located at the end of the pipe body away from the waste heat recovery pipe.

6. The nitrogen generator as described in claim 5, which is easy to maintain and use in low-temperature environments, is characterized in that... The exhaust pipe also includes a check valve, which is rotatably connected to the pipe body and located inside the pipe body.

7. A method for using a nitrogen generator that is easy to maintain and use in low-temperature environments, comprising the nitrogen generator as described in any one of claims 1-6, characterized in that, Includes the following steps: The heat source is activated, allowing hot air to preferentially enter the core heating chamber to heat the dual-tower nitrogen generator. Hot air enters the holding chamber through the hot air flow channel to provide auxiliary heating for other equipment in the nitrogen generation assembly; The hot air inside the cavity is introduced into the waste heat recovery pipe through the connecting pipe to preheat the air in the air intake pipe; The gas after heat exchange is completed is discharged through the exhaust pipe.

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