Nitrogen-making method and device for recycling waste heat of air compressor

Abstract

The invention relates to the technical field of sheet machining, in particular to a nitrogen making method and device for recycling waste heat of an air compressor, and the nitrogen making method for recycling waste heat of the air compressor comprises the following steps that S1, the nitrogen making device is started, nitrogen making work is carried out, and temperature information of all parts needing to be heated in the nitrogen making device is collected in real time; dynamically dividing heat supply priorities of a plurality of parts needing to be heated according to a preset division rule gradient to obtain a heat supply sequence table; s2, an air compressor body arranged in the nitrogen making device provides compressed air for nitrogen making work, and waste heat generated when the air compressor body works is collected; and S3, waste heat generated when the air compressor body works is transmitted according to the heat supply sequence table, and heat is supplied to the part needing to be heated through the corresponding heat transmission medium. According to the nitrogen making device, nitrogen making work can be achieved, meanwhile, efficient transfer and utilization of waste heat are achieved through collection and transfer work of the waste heat of the air compressor body, and therefore the energy consumption cost of the nitrogen making device is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sheet processing, in particular to a nitrogen production method and device for recovering and utilizing waste heat of an air compressor. BACKGROUND

[0002] Nitrogen production devices are indispensable equipment in many industries such as chemical industry, food industry, pharmaceutical industry, electronics industry, metallurgy industry, etc., and are used to provide nitrogen protection, purging, displacement and other process requirements. Traditional nitrogen production devices, such as pressure swing adsorption nitrogen production devices (PSA) and membrane separation nitrogen production devices, need to consume a large amount of electric energy to drive air compressors, vacuum pumps, valves and other equipment during operation. Especially for some enterprises with high demand for nitrogen, the energy consumption cost of the nitrogen production process accounts for a high proportion of the total energy consumption cost of the enterprise.

[0003] At present, although there are technologies for recovering and utilizing waste heat and improvements in nitrogen production technology in some fields, the application of air compressor waste heat combined with nitrogen production devices is still relatively rare. Most existing waste heat recovery systems are optimized for the cooling system of the air compressor itself, or are used to heat domestic water, hot water for production, etc., without fully considering the collaborative work with the nitrogen production device, resulting in low utilization efficiency of the air compressor waste heat and the energy consumption problem of the nitrogen production device not being effectively solved. For example, a nitrogen purification preheating limit recovery system and method based on PSA separation nitrogen production (publication number: CN119633590A) is disclosed in a Chinese patent. In this patent technology, through the parallel structure design of A reactor and B reactor and the cooperation with the heater, after the linkage switching of A three-way reversing valve and B three-way reversing valve, the first preheating of nitrogen through one reactor is realized, the heat stored in the honeycomb body in the absorption reactor is absorbed, and then the nitrogen enters another reactor for catalytic reaction. Through the continuous switching and circulation, the heat generated after the catalytic reaction in the reactor is used to preheat the nitrogen, save energy, and the outlet temperature of the finished nitrogen after efficient heat exchange basically reaches room temperature, without the need for cooling water cooling, saving cooling water consumption and equipment cost. However, there are problems such as unreasonable heat distribution and poor heating effect.

[0004] Meanwhile, in the field of industrial production, air compressors are widely used as important power equipment. During operation, air compressors will generate a large amount of waste heat due to the work of compressed air and the friction of mechanical parts. According to relevant data, about 70%-90% of the electric energy consumed by air compressors in actual work is finally converted into heat energy. If this waste heat is not effectively recovered and utilized, not only will it cause huge energy waste, but also an additional cooling system will be needed to handle the heat, increasing the operating cost and floor area of the equipment. SUMMARY

[0005] The technical problem to be solved by the present invention is that the existing nitrogen production device has a low recovery rate of waste heat in the system, and the uneven heat distribution also leads to a large waste of energy, requiring more energy to be consumed for heating.

[0006] To solve the above technical problems, the first aspect of the present invention adopts the following technical solution: a nitrogen production method by recycling waste heat from an air compressor, comprising the following steps:

[0007] S1: Start the nitrogen generator to produce nitrogen, collect temperature information of each part that needs to be heated in the nitrogen generator in real time, dynamically divide the heating priority of several parts that need to be heated according to the preset division rule gradient, and obtain a heating sequence table;

[0008] S2: The air compressor installed in the nitrogen generator provides compressed air for nitrogen production and collects the waste heat generated by the air compressor.

[0009] S3: The waste heat generated by the air compressor body during operation is transferred according to the heating sequence table, and the corresponding heat transfer medium is used to heat the parts that need to be heated.

[0010] When the present invention is working, it can realize the recovery and utilization of waste heat by collecting and transferring the waste heat of the air compressor body while realizing the nitrogen production work. By dividing the heating priorities of several parts that need to be heated, a heating sequence table is obtained, and the waste heat generated when the air compressor body is working is transferred according to the heating sequence table, thereby realizing efficient transfer and utilization of the waste heat, and can improve the recovery and utilization rate of the waste heat as much as possible, thereby reducing the energy consumption cost of the nitrogen production device and improving the economic benefits.

[0011] Preferably, in step S1, the temperature information of each part requiring heating in the nitrogen generator is collected in real time, and the heating priority of the parts requiring heating is dynamically divided according to a preset division rule gradient. When a heating sequence table is obtained, the following steps are adopted:

[0012] A1: Real-time temperature information of all heated parts of the nitrogen generator is collected and aligned through time-series storage.

[0013] A2: Based on a plurality of temperature information and the importance of the corresponding parts requiring heating, a preset division rule gradient is used to dynamically divide the heating priorities of the parts requiring heating to obtain a heating sequence table.

[0014] When the present invention is working, the temperature information of each part that needs to be heated in the nitrogen production device is collected in real time to dynamically divide the heating priorities of several parts that need to be heated, and a heating sequence table is obtained. The update time is high, and the heating priority can be dynamically adjusted according to actual conditions. It is suitable for the nitrogen production work needs at various stages, has strong adaptability and good versatility.

[0015] As preferred, in the step A2, the following step is further included:

[0016] B1: obtaining the optimal working temperature range of each heating site, and calculating the heat value required for adjusting the temperature of the heating site to the optimal working temperature range according to the real-time temperature value of the heating site;

[0017] B2: calculating the temperature difference of the heat transfer medium after passing through each heating site according to the required heat value and the corresponding heat exchange efficiency;

[0018] B3: optimizing and sorting the heating priority of the several heating sites according to the temperature difference of the heat transfer medium corresponding to each heating site, to obtain a heating sequence table.

[0019] As preferred, in the step B3, when optimizing and sorting the heating priority of the several heating sites according to the temperature difference of the heat transfer medium corresponding to each heating site, the following step is adopted: according to the optimal working temperature range and the corresponding safe working temperature range of each heating site, and in combination with the temperature difference of the heat transfer medium corresponding to each heating site, the several heating sites are divided into at least one branch group of heat transfer medium sequence passing through, and the output is integrated into a heating sequence table.

[0020] During the operation of the present application, according to the optimal working temperature range, the safe working temperature range of each heating site, and the temperature difference of the corresponding heat transfer medium, several branch groups are divided, and the several heating sites are sorted in the heating path of each branch group, so that the heat transfer medium flowing through each heating site can be kept within the corresponding safe working temperature range, and the heating site will not be burned out. In addition, a larger temperature difference can be maintained with the real-time temperature of the heating site, which can improve the efficiency of heat transfer, help the real-time temperature of the heating site to be quickly adjusted to the optimal working temperature range, has high working efficiency, and short adjustment time.

[0021] As preferred, in the step S2, the air compressor body provided in the nitrogen making device provides compressed air for the nitrogen making work, and when collecting the waste heat generated during the operation of the air compressor body, the following steps are adopted: several waste heat collectors provided in the nitrogen making device are installed on several heating sites of the air compressor body, the heating sites at least include one of the exhaust port, the lubricating oil path and the compression cylinder body of the air compressor body, and the waste heat is collected by the several waste heat collectors and stored in the waste heat storage device provided in the nitrogen making device through the heat transfer medium.

[0022] Preferably, in step S3, when the waste heat generated by the air compressor body during operation is transferred according to the heating sequence table and the corresponding heat transfer medium is used to supply heat to the parts requiring heating, the following steps are adopted to control the opening or disconnection of several pipeline valves provided in the nitrogen generator according to the heating sequence table to realize the opening or disconnection of the pipeline network provided in the nitrogen generator, so that the several parts requiring heating are sequentially connected according to the heating sequence table to allow the heat transfer medium to circulate and realize the heating of the parts requiring heating.

[0023] In order to solve the above technical problems, the first aspect of the present invention adopts the following technical solution: a nitrogen production device for recovering waste heat from an air compressor, comprising:

[0024] A control system for overall control of nitrogen production and heat distribution within the nitrogen production device;

[0025] Nitrogen generator, used to separate nitrogen from the air and produce nitrogen;

[0026] The air compressor body is used to provide compressed air for the entire nitrogen production device;

[0027] Waste heat recovery device, used to collect waste heat generated when the air compressor body is working;

[0028] Heat exchange system, used to transfer heat transfer medium to provide heat to the parts that need heating;

[0029] The nitrogen generator host, the air compressor body, the waste heat recovery device and the heat exchange system are all data-connected to the control system. The waste heat recovery device is provided with a plurality of waste heat collection ends, which respectively exchange heat with a plurality of heat-generating parts on the air compressor body. The heat exchange system is provided with a plurality of heat exchange parts for exchanging heat with a plurality of parts requiring heating on the nitrogen generator host. The heat transfer medium input ends of the plurality of heat exchange parts of the heat exchange system are all connected to the heat transfer medium output ends of the waste heat recovery device when controlled by the control system. The heat transfer medium output ends of the plurality of heat exchange parts of the heat exchange system are all connected to the heat transfer medium input ends of the waste heat recovery device when controlled by the control system.

[0030] Preferably, the heat exchange system is provided with a pipeline network for transmitting heat transfer medium, and the pipeline network is respectively connected to the waste heat recovery device and several heat exchange parts. Corresponding pipeline valves are provided on several control nodes of the pipeline network, and several pipeline valves are connected with the control system data. When the control system outputs a control signal, several pipeline valves are opened or disconnected to realize the adjustment of the corresponding heating pipelines in the pipeline network. The corresponding heat exchange parts in the several heat exchange parts are connected to each other after the control system outputs a control signal to allow the heat transfer medium to circulate.

[0031] Preferably, temperature sensors are provided on the heat transfer medium input end of the waste heat recovery device, the heat transfer medium output end of the waste heat recovery device, the heat transfer medium input end of each heat exchange part, the heat transfer medium output end of each heat exchange part, several parts requiring heating in the nitrogen making device, and several heating parts of the air compressor body, and the temperature sensors are connected to the control system data.

[0032] Preferably, the waste heat recovery device is provided with a plurality of fin heat exchange mechanisms, which respectively exchange heat with a plurality of heat-generating parts on the air compressor body. The heat exchange system is provided with a plurality of plate heat exchange mechanisms for exchanging heat with a plurality of parts requiring heating on the nitrogen generator main unit. The heat transfer medium input ends of the plurality of plate heat exchange mechanisms are all connected to the heat transfer medium output ends of the waste heat recovery device when controlled by the control system. The heat transfer medium output ends of the plurality of plate heat exchange mechanisms are all connected to the heat transfer medium input ends of the waste heat recovery device when controlled by the control system.

[0033] The beneficial technical effects of the present invention include:

[0034] 1. The present invention can collect and transfer waste heat from the air compressor body while achieving nitrogen production, thereby recovering and utilizing the waste heat. Furthermore, by dividing the heating priorities of several parts that need to be heated, a heating sequence table is obtained, and the waste heat generated by the air compressor body during operation is transferred according to the heating sequence table, thereby achieving efficient transfer and utilization of the waste heat, and maximizing the recovery and utilization of the waste heat, thereby reducing the energy consumption cost of the nitrogen production device and improving economic benefits.

[0035] 2. The present invention dynamically divides the heating priorities of several parts that need to be heated by real-time collection of temperature information of each part that needs to be heated in the nitrogen production device, and obtains a heating sequence table with high real-time update speed. The heating priority can be dynamically adjusted according to actual conditions, which is suitable for the nitrogen production work needs at various stages, has strong adaptability and good versatility.

[0036] 3. The present invention can divide each part that needs to be heated into several branch groups according to the optimal working temperature range, safe working temperature range and temperature difference of the corresponding heat transfer medium, and at the same time sort the several parts that need to be heated on the heating path of each branch group in order, so that the heat transfer medium can be kept within the corresponding safe working temperature range when flowing through each part that needs to be heated, and will not burn the part that needs to be heated. It can also maintain a large temperature difference with the real-time temperature of the part that needs to be heated, which can improve the efficiency of heat transfer and help the real-time temperature of the part that needs to be heated to be quickly adjusted to the optimal working temperature range, with high working efficiency and short adjustment time.

[0037] Other features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The present invention will be further described below with reference to the accompanying drawings:

[0039] Figure 1 The following is a work flow chart of a nitrogen production method using waste heat recovery from an air compressor;

[0040] Figure 2 This is a workflow diagram of step S1 in a nitrogen production method using waste heat recovery from an air compressor;

[0041] Figure 3 This is a workflow diagram of step A2 in a nitrogen production method using waste heat recovery from an air compressor;

[0042] Figure 4 A schematic diagram of the structure of a nitrogen production device that recovers waste heat from an air compressor Figure 1 ;

[0043] Figure 5 A schematic diagram of the structure of a nitrogen production device that recovers waste heat from an air compressor Figure 2 . DETAILED DESCRIPTION

[0044] The following is an explanation and description of the technical solutions of the embodiments of the present invention in conjunction with the drawings of the embodiments of the present invention. However, the following embodiments are only preferred embodiments of the present invention and are not exhaustive. Based on the embodiments in the implementation manner, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0045] In the following description, terms such as "inside", "outside", "up", "down", "left", "right", etc. that indicate directions or positional relationships are only used to facilitate the description of the embodiments and simplify the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0046] Example 1:

[0047] See also Figure 1 This embodiment discloses a nitrogen production method by recycling waste heat from an air compressor, comprising the following steps:

[0048] S1: Start the nitrogen generator to produce nitrogen, collect temperature information of each part that needs to be heated in the nitrogen generator in real time, dynamically divide the heating priority of several parts that need to be heated according to the preset division rule gradient, and obtain a heating sequence table;

[0049] S2: The air compressor body 3 provided in the nitrogen making device provides compressed air for nitrogen making and collects waste heat generated by the air compressor body 3 during operation;

[0050] S3: The waste heat generated by the air compressor body 3 during operation is transferred according to the heating sequence table, and the corresponding heat transfer medium is used to heat the parts that need to be heated.

[0051] When the present embodiment is in operation, the waste heat of the air compressor body 3 can be collected and transferred while nitrogen production is being carried out, thereby realizing waste heat recovery and utilization. Furthermore, by dividing the heating priorities of several parts requiring heating, a heating sequence table is obtained, and the waste heat generated during operation of the air compressor body 3 is transferred according to the heating sequence table, thereby realizing efficient transfer and utilization of the waste heat, and maximizing the recovery and utilization of the waste heat, thereby reducing the energy consumption cost of the nitrogen production device and improving economic benefits.

[0052] See also Figure 1 and Figure 2 In this embodiment, in step S1, the temperature information of each part requiring heating in the nitrogen generator is collected in real time, and the heating priority of the parts requiring heating is dynamically divided according to the preset division rule gradient. When the heating sequence table is obtained, the following steps are adopted:

[0053] A1: Real-time temperature information of all heated parts of the nitrogen generator is collected and aligned through time-series storage.

[0054] A2: Based on a number of temperature information and the importance of the corresponding parts that need to be heated, a preset division rule gradient is used to dynamically divide the heating priorities of the parts that need to be heated, and a heating sequence table is obtained. In specific implementation, the compressed air needs to be heated in the nitrogen production stage. The heated compressed air enters the nitrogen production host 2. In the pressure swing adsorption nitrogen production host 2, the difference in the adsorption capacity of the adsorbent for nitrogen and oxygen under different pressures is used to achieve nitrogen separation and production. Alternatively, in the membrane separation nitrogen production host 2, the different permeation rates of the membrane material to nitrogen and oxygen are used to separate nitrogen from the air. The produced nitrogen is transported to the gas consumption point through the nitrogen output pipeline. Among them, when reduction work is required, the adsorbent needs to be heated and reduced. This part consumes a lot of heat and is of high importance, so it needs to be given a higher priority. The temperature of the compressed air entering the membrane separation mechanism is more important, which directly affects the service life of the diaphragm and the output of nitrogen production. It is also a relatively important part that needs to be heated. Some parts are prone to work failures in low temperature environments, such as pipes through which cold air passes, various switch valves, cold insulation devices, etc., which also need to be heated. Activated carbon filters also need to be heated to improve the adsorption efficiency of activated carbon for oil vapor. By prioritizing different parts that need to be heated, heat is reasonably allocated to appropriate parts to meet the overall working needs of the nitrogen production device, reducing dependence on external heat sources and improving economic benefits.

[0055] When this embodiment is working, the temperature information of each part that needs to be heated in the nitrogen production device is collected in real time to dynamically divide the heating priorities of several parts that need to be heated, and obtain a heating sequence table. The table has high real-time update speed and can dynamically adjust the heating priority according to actual conditions. It is suitable for the nitrogen production work needs at various stages, has strong adaptability and good versatility.

[0056] In a specific implementation, in step S2, the air compressor body 3 provided in the nitrogen generating device provides compressed air for the nitrogen generating operation. When collecting the waste heat generated during the operation of the air compressor body 3, the following steps are adopted: a plurality of waste heat collectors provided in the nitrogen generating device are installed on a plurality of heat-generating parts of the air compressor body 3, the heat-generating parts including at least one of the exhaust port, the lubricating oil circuit, and the compression cylinder of the air compressor body 3. The waste heat is collected by the plurality of waste heat collectors and stored in a waste heat storage device provided in the nitrogen generating device via a heat transfer medium.

[0057] Preferably, in step S3, when the waste heat generated by the air compressor body 3 during operation is transferred according to the heating sequence table and the corresponding heat transfer medium is used to supply heat to the parts requiring heating, the following steps are adopted to control the opening or disconnection of several pipeline valves provided in the nitrogen generator according to the heating sequence table to realize the opening or disconnection of the pipeline network provided in the nitrogen generator, so that several parts requiring heating are sequentially connected according to the heating sequence table to allow the heat transfer medium to circulate and realize the heating of the parts requiring heating.

[0058] Example 2:

[0059] See also Figure 3 This embodiment provides a nitrogen production method by recovering waste heat from an air compressor. The similarities with other embodiments will not be repeated here, and the differences will be described in detail below.

[0060] In this embodiment, step A2 further includes the following steps:

[0061] B1: Obtain the optimal operating temperature range of each part to be heated, and calculate the heat value required to adjust the temperature of the part to be heated to the optimal operating temperature range based on the real-time temperature value of the part to be heated;

[0062] B2: Calculate the temperature difference of the corresponding heat transfer medium after it passes through each part that needs to be heated based on the required heat value and the corresponding heat exchange efficiency;

[0063] B3: Optimize and sort the heating priorities of several parts requiring heating according to the temperature difference of the heat transfer medium corresponding to each part requiring heating to obtain a heating sequence table.

[0064] Preferably, in step B3, when optimizing and ranking the heating priorities of several parts that need to be heated according to the temperature difference of the heat transfer medium corresponding to each part that needs to be heated, the following steps are adopted: according to the optimal operating temperature range and the corresponding safe operating temperature range of each part that needs to be heated, and in combination with the temperature difference of the heat transfer medium corresponding to each part that needs to be heated, the several parts that need to be heated are divided into at least one group of branch groups through which the heat transfer medium passes in sequence, and the integrated output is formed into a heating sequence table.

[0065] In the working process of the embodiment, according to the optimal working temperature range, the safe working temperature range and the temperature difference of the corresponding heat transfer medium of each heating part, a plurality of branch groups are divided, and the heating paths of each branch group for a plurality of heating parts are sequenced, so that the heat transfer medium can keep within the corresponding safe working temperature range when flowing through each heating part, the heating part will not be burned, and a larger temperature difference with the real-time temperature of the heating part can be kept, the heat transfer efficiency can be improved, the real-time temperature of the heating part can be quickly adjusted to the optimal working temperature range, the working efficiency is high, and the adjustment time is short.

[0066] In the specific implementation, in step B3, according to the optimal working temperature range and the corresponding safe working temperature range of each heating part, and in combination with the temperature difference of the corresponding heat transfer medium of each heating part, a plurality of heating parts are divided into at least one branch group through which the heat transfer medium sequentially passes, and when the output is integrated into a heating sequence table, the following steps are adopted:

[0067] C1: obtaining the optimal working temperature range and the corresponding safe working temperature range of each heating part, and the temperature difference of the corresponding heat transfer medium of each heating part, establishing a heat demand model of each heating part, and embedding the real-time temperature of each heating part;

[0068] C2: according to the heat demand model of a plurality of heating parts, a branch group with a heat transfer medium gradient is established, and the branch group is provided with at least one, in the specific implementation, the length of each branch group and the flow of the corresponding heat transfer medium also need to be adjusted according to the types of different heating parts, and the branch group at least includes one of a high-temperature independent branch, a large-flow full-link branch and a low-temperature integrated branch.

[0069] Embodiment three

[0070] Please refer to Figure 4 and Figure 5 , the embodiment discloses a nitrogen making device for recovering and utilizing waste heat of an air compressor, and applies a nitrogen making method for recovering and utilizing waste heat of an air compressor in the above embodiment, which comprises:

[0071] A control system 1 is used for overall controlling the execution of the nitrogen making work and the heat distribution in the nitrogen making device.

[0072] A nitrogen making main machine 2 is used for separating nitrogen in air to make nitrogen.

[0073] An air compressor body 3 is used for providing compressed air for the whole nitrogen making device.

[0074] A waste heat recovery device 4 is arranged to collect the waste heat generated by the air compressor body 3 during operation;

[0075] A heat exchange system 5 is arranged to transfer heat transfer medium to heat the parts requiring heating.

[0076] The nitrogen generator main machine 2, the air compressor body 3, the waste heat recovery device 4 and the heat exchange system 5 are connected to the control system 1, the waste heat recovery device 4 is provided with a plurality of waste heat collection ends, the plurality of waste heat collection ends are respectively in heat exchange with a plurality of heat generating parts on the air compressor body 3, the heat exchange system 5 is provided with a plurality of heat exchange parts for heat exchange with a plurality of parts requiring heating on the nitrogen generator main machine 2, the heat transfer medium input ends of the plurality of heat exchange parts of the heat exchange system 5 are connected to the heat transfer medium output ends of the waste heat recovery device 4 under the control of the control system 1, and the heat transfer medium output ends of the plurality of heat exchange parts of the heat exchange system 5 are connected to the heat transfer medium input ends of the waste heat recovery device 4 under the control of the control system 1.

[0077] In a specific implementation, the heat exchange system 5 is provided with a pipeline network for heat transfer medium transmission, the pipeline network is connected to the waste heat recovery device 4 and the plurality of heat exchange parts, a plurality of control nodes of the pipeline network are respectively provided with corresponding pipeline valves, the plurality of pipeline valves are connected to the control system 1, the plurality of pipeline valves are opened or closed to adjust the corresponding heating pipelines in the pipeline network under the control of the control system 1, and the corresponding heat exchange parts in the plurality of heat exchange parts are connected to allow the heat transfer medium to flow under the control of the control system 1.

[0078] Preferably, the heat transfer medium input end of the waste heat recovery device 4, the heat transfer medium output end of the waste heat recovery device 4, the heat transfer medium input end of each heat exchange part, the heat transfer medium output end of each heat exchange part, a plurality of parts requiring heating in the nitrogen generator and a plurality of heat generating parts of the air compressor body 3 are respectively provided with temperature sensors connected to the control system 1, so as to monitor the real-time temperature and temperature difference of the inflowing or outflowing heat transfer medium, and dynamically adjust the sequence of the plurality of heat exchange parts in the heat transfer medium transmission path by obtaining the real-time temperature of each part requiring heating, thereby facilitating the control system 1 to perform fine overall control.

[0079] Preferably, the heat transfer medium input end of the waste heat recovery device 4, the heat transfer medium output end of the waste heat recovery device 4, the heat transfer medium input end of each heat exchange part, the heat transfer medium output end of each heat exchange part, a plurality of parts requiring heating in the nitrogen generator and a plurality of heat generating parts of the air compressor body 3 are respectively provided with temperature sensors connected to the control system 1.

[0080] In specific implementation, the waste heat recovery device 4 is provided with a number of fin heat exchange mechanisms, and the several fin heat exchange mechanisms respectively exchange heat with a number of heating parts on the air compressor body 3, which can increase the heat exchange area and realize efficient heat exchange. In specific implementation, it is necessary to use high-temperature resistant and corrosion-resistant materials to make the waste heat recovery device 4, such as stainless steel, so that it can operate stably for a long time in a high temperature and high humidity environment. The heat exchange system 5 is provided with a number of plate heat exchange mechanisms for exchanging heat with a number of parts requiring heating on the nitrogen production host 2. The heat transfer medium input ends of the several plate heat exchange mechanisms are all connected to the heat transfer medium output ends of the waste heat recovery device 4 when controlled by the control system 1, and the heat transfer medium output ends of the several plate heat exchange mechanisms are all connected to the heat transfer medium input end of the waste heat recovery device 4 when controlled by the control system 1.

[0081] The beneficial technical effects of this embodiment include: the present invention can realize the recovery and utilization of waste heat by collecting and transferring waste heat from the air compressor body while realizing nitrogen production work, and by dividing the heating priority of several parts that need to be heated, a heating sequence table is obtained, and the waste heat generated by the air compressor body during operation is transferred according to the heating sequence table, thereby realizing efficient transfer and utilization of waste heat, and can maximize the recovery and utilization rate of waste heat, thereby reducing the energy consumption cost of the nitrogen production device and improving economic benefits.

[0082] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art will understand that the present invention includes, but is not limited to, the contents described in the drawings and the above specific embodiments. Any modifications that do not deviate from the functional and structural principles of the present invention are intended to be included within the scope of the claims.

Claims

1. A nitrogen production method by recycling waste heat from an air compressor, characterized in that: The following steps are involved: S1: Start the nitrogen generator to produce nitrogen, collect temperature information of each part that needs to be heated in the nitrogen generator in real time, dynamically divide the heating priority of several parts that need to be heated according to the preset division rule gradient, and obtain a heating sequence table; S2: The air compressor body (3) provided in the nitrogen making device provides compressed air for nitrogen making and collects waste heat generated when the air compressor body (3) is working; S3: The waste heat generated by the air compressor body (3) during operation is transferred according to the heating sequence table, and the corresponding heat transfer medium is used to heat the parts that need to be heated.

2. The nitrogen production method by recycling waste heat from an air compressor according to claim 1, characterized in that: In step S1, the temperature information of each part requiring heating in the nitrogen generator is collected in real time, and the heating priority of the parts requiring heating is dynamically divided according to a preset division rule gradient. When a heating sequence table is obtained, the following steps are adopted: A1: Real-time temperature information of all heated parts of the nitrogen generator is collected and aligned through time-series storage. A2: Based on a plurality of temperature information and the importance of the corresponding parts requiring heating, a preset division rule gradient is used to dynamically divide the heating priorities of the parts requiring heating to obtain a heating sequence table.

3. The nitrogen production method by recycling waste heat from an air compressor according to claim 1, characterized in that: In step A2, the following steps are also included: B1: Obtain the optimal operating temperature range of each part to be heated, and calculate the heat value required to adjust the temperature of the part to be heated to the optimal operating temperature range based on the real-time temperature value of the part to be heated; B2: Calculate the temperature difference of the corresponding heat transfer medium after it passes through each part that needs to be heated based on the required heat value and the corresponding heat exchange efficiency; B3: Optimize and sort the heating priorities of several parts requiring heating according to the temperature difference of the heat transfer medium corresponding to each part requiring heating to obtain a heating sequence table.

4. The nitrogen production method by recycling waste heat from an air compressor according to claim 3, characterized in that: In step B3, when optimizing and ranking the heating priorities of several parts requiring heating according to the temperature difference of the heat transfer medium corresponding to each part requiring heating, the following steps are adopted: according to the optimal operating temperature range and the corresponding safe operating temperature range of each part requiring heating, and in combination with the temperature difference of the heat transfer medium corresponding to each part requiring heating, the several parts requiring heating are divided into at least one group of branch groups through which the heat transfer medium passes in sequence, and the integrated output is a heating sequence table.

5. The nitrogen production method by recycling waste heat from an air compressor according to claim 1, characterized in that: In step S2, the air compressor body (3) provided in the nitrogen making device provides compressed air for nitrogen making work, and when collecting waste heat generated by the air compressor body (3) during operation, the following steps are adopted: a plurality of waste heat collectors provided in the nitrogen making device are installed on a plurality of heat-generating parts on the air compressor body (3), the heat-generating parts including at least one of the exhaust port, the lubricating oil circuit and the compression cylinder of the air compressor body (3); the waste heat is collected by the plurality of waste heat collectors and stored in a waste heat storage device provided in the nitrogen making device through a heat transfer medium.

6. The nitrogen production method by recycling waste heat from an air compressor according to claim 1, characterized in that: In step S3, when the waste heat generated by the air compressor body (3) during operation is transferred according to the heating sequence table and the corresponding heat transfer medium is used to heat the parts requiring heating, the following steps are adopted to control the opening or disconnection of a plurality of pipeline valves provided in the nitrogen making device according to the heating sequence table to realize the opening or disconnection of the pipeline network provided in the nitrogen making device, so that the plurality of parts requiring heating are sequentially connected according to the heating sequence table so that the heat transfer medium can flow and realize the heating of the parts requiring heating.

7. A nitrogen production device for recovering waste heat from an air compressor, characterized in that: include: A control system (1) for overall control of nitrogen production and heat distribution within the nitrogen production device; A nitrogen generator (2) is used to separate nitrogen from the air and produce nitrogen; The air compressor body (3) is used to provide compressed air for the entire nitrogen production device; A waste heat recovery device (4) for collecting waste heat generated by the air compressor body (3) during operation; A heat exchange system (5) for transferring a heat transfer medium to heat a portion requiring heating; The nitrogen generator (2), the air compressor body (3), the waste heat recovery device (4) and the heat exchange system (5) are all data-connected to the control system (1). The waste heat recovery device (4) is provided with a plurality of waste heat collection ends, and the plurality of waste heat collection ends respectively exchange heat with a plurality of heating parts on the air compressor body (3). The heat exchange system (5) is provided with a plurality of heat exchange parts for exchanging heat with a plurality of parts requiring heating on the nitrogen generator (2). The heat transfer medium input ends of the plurality of heat exchange parts of the heat exchange system (5) are all connected to the heat transfer medium output ends of the waste heat recovery device (4) when the control system (1) is controlled. The heat transfer medium output ends of the plurality of heat exchange parts of the heat exchange system (5) are all connected to the heat transfer medium input ends of the waste heat recovery device (4) when the control system (1) is controlled.

8. The nitrogen production device for recovering waste heat from an air compressor according to claim 7, characterized in that: The heat exchange system (5) is provided with a pipeline network for transmitting a heat transfer medium, the pipeline network is respectively connected to the waste heat recovery device (4) and a plurality of heat exchange parts, a plurality of control nodes of the pipeline network are provided with corresponding pipeline valves, the plurality of pipeline valves are data-connected with the control system (1), the plurality of pipeline valves are opened or disconnected when the control system (1) outputs a control signal to achieve adjustment of the corresponding heating pipelines in the pipeline network, and the corresponding heat exchange parts in the plurality of heat exchange parts are connected to each other after the control system (1) outputs a control signal to allow the heat transfer medium to circulate.

9. The nitrogen production device for recovering waste heat from an air compressor according to claim 7, characterized in that: Temperature sensors are provided on the heat transfer medium input end of the waste heat recovery device (4), the heat transfer medium output end of the waste heat recovery device (4), the heat transfer medium input end of each heat exchange part, the heat transfer medium output end of each heat exchange part, several parts requiring heating in the nitrogen making device, and several heating parts of the air compressor body (3), and the temperature sensors are data-connected to the control system (1).

10. The nitrogen production device for recovering waste heat from an air compressor according to claim 7, characterized in that: The waste heat recovery device (4) is provided with a plurality of fin heat exchange mechanisms, and the plurality of fin heat exchange mechanisms respectively exchange heat with a plurality of heating parts on the air compressor body (3). The heat exchange system (5) is provided with a plurality of plate heat exchange mechanisms for exchanging heat with a plurality of parts requiring heating on the nitrogen generator (2). The heat transfer medium input ends of the plurality of plate heat exchange mechanisms are all connected to the heat transfer medium output ends of the waste heat recovery device (4) when the control system (1) is controlled. The heat transfer medium output ends of the plurality of plate heat exchange mechanisms are all connected to the heat transfer medium input end of the waste heat recovery device (4) when the control system (1) is controlled.

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