A compressed gas heat recovery device

Abstract

The utility model relates to gas heat recovery technical field, the utility model provides a kind of compressed gas heat recovery device, it includes: bottom plate, the top of the bottom plate is fixedly connected with dirty nitrogen gas intake end, the top of the bottom plate is fixedly connected with dirty nitrogen gas outlet end, the top of the bottom plate is fixedly connected with support, the top of the bottom plate is provided with last stage compression heat recovery recycling device.The utility model recovers waste heat of gas compressor by dirty nitrogen preheater, greatly reduces the secondary heat supplement load of electric furnace, electric furnace does not need full load operation, only needs to supplement a small amount of heat, and the preheated dirty nitrogen gas can be supplemented to the required temperature, significantly reduces electric energy consumption.Through the above technical scheme, the technical problems of excessive heat exchange caused by too large dirty nitrogen gas flow and insufficient heat exchange caused by too small flow are solved in the prior art, and the length of the heating process accounts for the entire molecular sieve regeneration process, and the power consumption is high.

Description

Technical Field

[0001] This utility model relates to the field of gas heat recovery technology, specifically to a compressed gas heat recovery device. Background Technology

[0002] Raw air is drawn in from the atmosphere, passes through a filter to remove dust and mechanical impurities, enters an air turbine compressor, and is then sent to an air cooling tower for cleaning and cooling. The washed and cooled air then enters a molecular sieve purification system for further purification. Two molecular sieve purifiers are used interchangeably; while one is operating, the other is regenerating. The purified air then enters a cryogenic system to separate oxygen and nitrogen for external use. During molecular sieve regeneration, a heating and purging process of approximately 160 minutes is required before reuse. This heating process involves using an electric furnace to heat approximately 32,000 m³ of waste nitrogen from around 12.5°C to around 170°C for 160 minutes. After 353 minutes, the other molecular sieve, which is used alternately, also enters the regeneration process.

[0003] A waste heat recovery device for an air compressor, as disclosed in the public announcement (Publication No.: CN 215927789 U), includes a heat exchange box, a softener, and an external heat-conducting pipe. The external heat-conducting pipe surrounds the outside of a gas storage tank. Gas exchange occurs between the heat exchange box and the air compressor, and the heat exchange box outputs gas to the gas storage tank. Water exchange occurs between the heat exchange box, the external heat-conducting pipe, and an external water intake device via the softener. An ultraviolet lamp is installed at the top of the heat exchange box. Several sets of internal heat-conducting pipes are arranged in a serpentine pattern inside the heat exchange box, each set achieving one cycle of compressed gas. The inlet end of each set of internal heat-conducting pipes is connected to the outlet end of a cylinder, and the outlet end of each set of internal heat-conducting pipes is connected to the inlet end of a cylinder. The outlet end of the internal heat-conducting pipe connected to the outlet end of the last stage cylinder is connected to the gas storage tank. This waste heat recovery device with the above structure softens and sterilizes the water during the waste heat recovery process, and collects the water in stages, meeting the daily water needs of the workshop.

[0004] In the aforementioned application, during the molecular sieve regeneration process, approximately 32,000 m³ of waste nitrogen gas needs to be heated from around 12.5°C to around 170°C. This heating process relies entirely on an electric furnace to provide the heat source, and the heating process takes up a significant portion of the entire molecular sieve regeneration process, resulting in high power consumption. Furthermore, there are issues with excessive heat exchange due to excessively high waste nitrogen gas flow rate and insufficient heat exchange due to excessively low flow rate. Therefore, we propose a compressed gas heat recovery device. Utility Model Content

[0005] To overcome the above-mentioned defects, this utility model provides a compressed gas heat recovery device, which solves the technical problem in the prior art that only a small amount of heat needs to be added to replenish the preheated waste nitrogen gas to the required temperature, thus significantly reducing the power consumption.

[0006] According to one aspect, at least one embodiment of the present invention provides a compressed gas heat recovery device, comprising: a base plate, a sludge nitrogen inlet fixedly connected to the top of the base plate, a sludge nitrogen outlet fixedly connected to the top of the base plate, a bracket fixedly connected to the top of the base plate, and a final stage compressed heat recovery and reuse device provided on the top of the base plate. The final stage compression heat recovery and reuse device includes a support base, the bottom of which is fixedly connected to the top of a base plate. A gas compressor is fixedly connected to the top of the support base. A pulley is rotatably connected to the side of the gas compressor. A gas pipeline after the final stage compression of the gas compressor passes through and connects to the side of the gas compressor. One end of the gas pipeline after the final stage compression of the gas compressor passes through and connects to a waste nitrogen preheater. The bottom of the waste nitrogen preheater is fixedly connected to the top of the base plate.

[0007] For example, in at least one embodiment of the present invention, a compressed gas heat recovery device further includes: a waste nitrogen gas inlet pipe penetrating and connected to the side of the waste nitrogen preheater; the end of the waste nitrogen gas inlet pipe away from the waste nitrogen preheater penetrating and connected to the side of the waste nitrogen gas inlet; a waste nitrogen gas outlet pipe penetrating and connected to the side of the waste nitrogen preheater; and the end of the waste nitrogen gas outlet pipe away from the waste nitrogen preheater penetrating and connected to the side of the waste nitrogen gas outlet. This allows waste nitrogen gas to enter the waste nitrogen preheater through the waste nitrogen gas inlet pipe, where it can fully exchange heat with the high-temperature gas in the gas pipeline after the final stage compression of the gas compressor to achieve preheating. The gas is then sent to the electric furnace through the waste nitrogen gas outlet pipe, reducing the need for the electric furnace to heat the waste nitrogen gas to the required temperature, lowering the operating load and power consumption of the electric furnace, while ensuring the supply of waste nitrogen gas heat source for molecular sieve regeneration.

[0008] The side of the waste nitrogen preheater is connected to a waste nitrogen preheater gas pipe, and one end of the waste nitrogen preheater gas pipe is connected to a water-cooled gas final stage cooler. The outer circumference of the water-cooled gas final stage cooler is fixedly connected to the inner wall of the support. This allows the gas in the gas pipeline, which has been pre-cooled by the waste nitrogen preheater and compressed by the final stage of the gas compressor, to enter the water-cooled gas final stage cooler for further cooling through the waste nitrogen preheater gas pipe. Because the gas has already been pre-cooled, the cooling load of the water-cooled gas final stage cooler is significantly reduced. The support's fixing function ensures the stable operation of the water-cooled gas final stage cooler, preventing equipment shaking from affecting the cooling effect, and also creating conditions for energy saving of subsequent cooling water.

[0009] An electric furnace is fixedly connected to the top of the base plate, and a heating tube runs through and connects to the side of the electric furnace. One end of the heating tube is fixedly connected to the side of the waste nitrogen preheater. When the gas in the gas pipeline after the final stage compression of the gas compressor is insufficient to meet the preheating requirements of the waste nitrogen, the electric furnace drives the heating tube to supplement heat to the waste nitrogen preheater. This ensures that the waste nitrogen entering the waste nitrogen preheater pipeline can reach the preset preheating temperature, guaranteeing the stability of the heat source for molecular sieve regeneration. Furthermore, the electric furnace does not need to operate at full load; only supplemental heat is required, further reducing energy consumption.

[0010] A cooling water inlet pipe and a cooling water outlet pipe are connected to the side of the water-cooled gas final stage cooler. A connecting pipe is connected to the side of the electric furnace, with one end of the connecting pipe connected to the side of the water-cooled gas final stage cooler. The water-cooled gas final stage cooler cools the gas by using cooling water input through the cooling water inlet pipe and output through the cooling water outlet pipe. Since the gas has already been preheated by the nitrogen preheater, the required cooling water volume is reduced, thus lowering cooling water consumption. Furthermore, the connecting pipe enables thermal linkage between the electric furnace and the water-cooled gas final stage cooler. If the electric furnace has excess heat, it can be transferred to the water-cooled gas final stage cooler through the connecting pipe, further optimizing heat utilization and reducing overall energy consumption.

[0011] According to another aspect, at least one embodiment of the present invention also provides a compressed gas heat recovery device, comprising: an automatic temperature control device provided on the outer circumferential surface of the waste nitrogen gas inlet waste nitrogen preheater pipe, the automatic temperature control device including a sealed box, the inner side wall of the sealed box being fixedly connected to the circumferential surface of the waste nitrogen gas inlet waste nitrogen preheater pipe, a connecting plate being fixedly connected to the side of the sealed box, an adjusting motor being fixedly connected to the side of the connecting plate, a lifting screw being fixedly connected to the output shaft of the adjusting motor, a connecting sleeve being threadedly connected to the circumferential surface of the lifting screw, and a sealing block being fixedly connected to the bottom of the connecting sleeve.

[0012] For example, in at least one embodiment of the present invention, a compressed gas heat recovery device further includes: a sealing baffle fixedly connected to the bottom of the sealing block, a connecting rod fixedly connected to the side of the sealing baffle, and the end of the connecting rod away from the sealing baffle fixedly connected to the bottom of the sealing block. The connecting rod can guide the movement of the sealing baffle, making the movement of the sealing baffle more stable when adjusting the flow rate of the waste nitrogen gas entering the waste nitrogen preheater pipeline, avoiding poor sealing or uneven flow adjustment due to baffle offset; at the same time, the fixed connection between the sealing baffle and the sealing block ensures that the adjustment action is synchronized, ensuring a stable flow rate of waste nitrogen gas in the waste nitrogen preheater pipeline, thereby maintaining a stable heat exchange efficiency of the waste nitrogen preheater, and avoiding the impact of flow fluctuations on the electric furnace load or the gas cooling effect of the gas pipeline after the final stage compression of the gas compressor.

[0013] The side of the sealing baffle is located on the displacement trajectory of the waste nitrogen gas inlet pipe to the waste nitrogen preheater, and the side of the sealing block is slidably connected to the inner wall of the sealing box. The position design of the sealing baffle ensures that it can effectively block or open the waste nitrogen gas inlet pipe to the waste nitrogen preheater, accurately adjust the gas flow, and ensure that the heat exchange of the waste nitrogen preheater is controllable. The sliding of the sealing block in the sealing box ensures the sealing of the adjustment process, avoids gas leakage or heat loss, reduces the wear of the adjustment components, extends the service life of the automatic temperature control device, and indirectly ensures the energy-saving stability of the overall device.

[0014] The top of the sealing baffle is located at the bottom of the sealing block. There are two sealing baffles, symmetrically distributed along the vertical central axis of the sealing block. The two sealing baffles can simultaneously adjust the flow rate from both sides of the waste nitrogen gas entering the waste nitrogen preheater pipeline, avoiding unstable airflow in the pipeline caused by unilateral adjustment. This ensures that the waste nitrogen gas is evenly distributed when entering the waste nitrogen preheater, resulting in more thorough heat exchange with the gas in the pipeline after final stage compression by the gas compressor. At the same time, the symmetrical design balances the force on the sealing block, reduces jamming during the adjustment process, and improves the adjustment accuracy of the automatic temperature control device.

[0015] The top of the sealed box is bolted to a sealing top plate, and a rectangular groove is formed on the top of the sealing top plate. A sealing ring is fixedly connected to the inner wall of the rectangular groove. The bolted connection of the sealing top plate facilitates the opening of the sealed box for inspection and maintenance of components such as the regulating motor and lifting screw inside the automatic temperature control device. The rectangular groove provides movement space for the connecting rod, and the sealing ring ensures the sealing of the groove, preventing gas leakage or heat loss. This maintains stable gas pressure in the waste nitrogen gas inlet pipe and improves the heat exchange efficiency of the waste nitrogen preheater, thereby enhancing the overall reliability and long-term energy-saving effect of the device.

[0016] The beneficial effects of the embodiments of this utility model are as follows: In this invention, the final stage compression heat recovery and reuse device recovers the waste heat of the gas compressor to preheat the waste nitrogen gas through a waste nitrogen preheater, which greatly reduces the secondary heating load of the electric furnace. The electric furnace does not need to operate at full load, and only needs to supplement a small amount of heat to replenish the preheated waste nitrogen gas to the required temperature, significantly reducing power consumption. At the same time, the pre-cooled gas reduces the cooling pressure of the water-cooled gas final stage cooler and reduces the cooling water input of the cooling water inlet pipe, further saving water resources and cooling system energy consumption, and achieving the core goal of waste heat recovery and dual energy saving.

[0017] In this invention, by adjusting the flow rate of the waste nitrogen gas into the waste nitrogen preheater pipeline through the sealing baffle, the heat exchange in the waste nitrogen preheater can be matched in real time. This avoids excessive heat exchange caused by excessive waste nitrogen gas flow, preventing the gas in the pipeline from cooling too low after the final stage compression of the gas compressor, which would affect subsequent processes. It also avoids insufficient heat exchange caused by insufficient flow, eliminating the need for the electric furnace to consume a large amount of additional electrical energy for heating. This keeps the waste nitrogen gas preheating temperature stable within the target range, directly reducing the ineffective energy consumption of the electric furnace. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this utility model and these drawings without any creative effort.

[0019] Figure 1 This is a structural schematic diagram of the overall appearance of this utility model; Figure 2 This is a schematic diagram of the structure of the gas compressor of this utility model; Figure 3 This is a schematic diagram of the structure of the final stage compression heat recovery and reuse device of this utility model; Figure 4 This is a schematic diagram of the structure of the water-cooled gas final stage cooler of this utility model; Figure 5 This is a cross-sectional structural diagram of the automatic temperature control device of this utility model.

[0020] In the diagram: 1. Base plate; 2. Waste nitrogen inlet; 3. Waste nitrogen outlet; 4. Support; 5. Final stage compression heat recovery and reuse device; 6. Automatic temperature control device; 7. Cooling water inlet pipe; 8. Cooling water outlet pipe; 9. Connecting pipe; 10. Electric furnace; 51. Support base; 52. Gas compressor; 53. Pulley; 54. Gas pipe after final stage compression of the gas compressor; 55. Waste nitrogen preheater; 56. Waste nitrogen inlet pipe to waste nitrogen preheater; 57. Waste nitrogen outlet pipe to waste nitrogen preheater; 59. Electric furnace heating tube; 510. Gas pipe to waste nitrogen preheater; 511. Water-cooled final stage gas cooler; 61. Sealing box; 62. Connecting plate; 63. Adjusting motor; 64. Lifting screw; 65. Connecting sleeve; 66. Sealing block; 67. Sealing baffle; 68. Connecting rod; 69. Sealing top plate. Detailed Implementation The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit its scope.

[0021] To keep the drawings concise, only the parts relevant to the utility model are shown schematically in each drawing; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of the components with the same structure or function is schematically shown, or only one is labeled. In this document, "a" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0022] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0024] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] like Figures 1-5 As shown, it illustrates a compressed gas heat recovery device according to an embodiment of the present invention, including: a base plate 1, a sludge nitrogen gas inlet 2 fixedly connected to the top of the base plate 1, a sludge nitrogen gas outlet 3 fixedly connected to the top of the base plate 1, a bracket 4 fixedly connected to the top of the base plate 1, and a final stage compressed heat recovery and reuse device 5 provided on the top of the base plate 1. The final stage compression heat recovery and reuse device 5 includes a support base 51. The bottom of the support base 51 is fixedly connected to the top of the base plate 1. A gas compressor 52 is fixedly connected to the top of the support base 51. A pulley 53 is rotatably connected to the side of the gas compressor 52. A gas pipeline 54 after the final stage compression of the gas compressor is passed through and connected to the side of the gas compressor 52. One end of the gas pipeline 54 after the final stage compression of the gas compressor is passed through and connected to a waste nitrogen preheater 55. The bottom of the waste nitrogen preheater 55 is fixedly connected to the top of the base plate 1.

[0027] In some examples, a waste nitrogen preheater 55 has a waste nitrogen gas inlet pipe 56 that runs through and connects to its side. The end of the waste nitrogen gas inlet pipe 56 away from the waste nitrogen preheater 55 runs through and connects to the side of the waste nitrogen gas inlet end 2. A waste nitrogen gas outlet pipe 57 runs through and connects to the side of the waste nitrogen preheater 55. The end of the waste nitrogen gas outlet pipe 57 away from the waste nitrogen preheater 55 runs through and connects to the side of the waste nitrogen gas outlet end 3. This allows the waste nitrogen gas to enter the waste nitrogen preheater 55 through the waste nitrogen gas inlet pipe 56, where it undergoes sufficient heat exchange with the high-temperature gas in the gas pipeline 54 after final compression by the gas compressor, achieving preheating. The gas is then sent to the electric furnace 10 through the waste nitrogen gas outlet pipe 57. This reduces the amount of heat the electric furnace 10 needs to provide to the required temperature, lowering the operating load and power consumption of the electric furnace 10, while ensuring a sufficient heat source for the waste nitrogen gas used in molecular sieve regeneration.

[0028] A gas pipeline 510 for discharging waste nitrogen from the preheater 55 passes through and connects to the side of the preheater 55. One end of the gas pipeline 510 passes through and connects to a water-cooled final stage gas cooler 511. The outer circumference of the water-cooled final stage gas cooler 511 is fixedly connected to the inner wall of the support 4. This allows the gas in the gas pipeline 54, which has been pre-cooled by the preheater 55, to enter the water-cooled final stage gas cooler 511 for further cooling through the gas pipeline 510. Because the gas has already been pre-cooled, the cooling load of the water-cooled final stage gas cooler 511 is significantly reduced. The fixing function of the support 4 ensures the stable operation of the water-cooled final stage gas cooler 511, preventing the cooling effect from being affected by equipment shaking, and creating conditions for energy saving of subsequent cooling water.

[0029] An electric furnace 10 is fixedly connected to the top of the base plate 1. An electric furnace heating tube 59 runs through and connects to the side of the electric furnace 10. One end of the electric furnace heating tube 59 is fixedly connected to the side of the waste nitrogen preheater 55. When the gas heat in the gas pipeline 54 after the final stage compression of the gas compressor is insufficient and cannot meet the preheating requirements of the waste nitrogen, the electric furnace heating tube 59 is driven by the electric furnace 10 to supplement the heat to the waste nitrogen preheater 55. This ensures that the waste nitrogen entering the waste nitrogen preheater pipeline 56 can reach the preset preheating temperature, ensuring the stability of the heat source for molecular sieve regeneration. At the same time, the electric furnace 10 does not need to operate at full load; only supplemental heat is required, further reducing energy consumption.

[0030] A cooling water inlet pipe 7 and a cooling water outlet pipe 8 are connected to the side of the water-cooled gas final stage cooler 511. A connecting pipe 9 is connected to the side of the electric furnace 10, with one end of the connecting pipe 9 connected to the side of the water-cooled gas final stage cooler 511. The water-cooled gas final stage cooler 511 can cool the gas by receiving cooling water through the cooling water inlet pipe 7 and outputting it through the cooling water outlet pipe 8. Since the gas has been preheated by the nitrogen preheater 55, the required cooling water volume is reduced, thus reducing cooling water consumption. On the other hand, the connecting pipe 9 can realize the thermal linkage between the electric furnace 10 and the water-cooled gas final stage cooler 511. If the electric furnace 10 has excess heat, it can be transferred to the water-cooled gas final stage cooler 511 through the connecting pipe 9, further optimizing heat utilization and reducing overall energy consumption.

[0031] For example, such as Figures 1-5As shown, after the device is started, the gas compressor 52, fixed to the base plate 1 by the support 51, begins operation to perform multi-stage compression of the gas. The high-temperature gas generated after the final stage compression of the gas compressor 52 carries a large amount of recoverable industrial waste heat and is transported to the waste nitrogen preheater 55 through the gas pipeline 54 after the final stage compression, completing the initial energy input for heat recovery and providing the core heat source for subsequent heat exchange. Simultaneously, low-temperature waste nitrogen gas from the cold box, used for molecular sieve regeneration, enters the waste nitrogen preheater 55 through the waste nitrogen gas entry pipeline 56. At this time, the high-temperature gas and the low-temperature waste nitrogen gas form counter-current or co-current heat exchange within the waste nitrogen preheater 55: the heat from the high-temperature gas is transferred to the low-temperature waste nitrogen gas through the heat exchange elements inside the preheater, achieving preliminary preheating of the waste nitrogen gas. The high-temperature gas itself releases heat, causing its temperature to initially decrease, completing the initial cooling process. After heat exchange, the two materials are transported along different paths to meet the needs of subsequent processes. The waste nitrogen gas, preheated by the waste nitrogen preheater 55, is already at a higher temperature than its initial temperature, eliminating the need for direct full-load heating by the electric furnace 10. It is then transported to the electric furnace 10 via the waste nitrogen preheater outlet pipe 57, where it is reheated to approximately 170°C. Subsequently, it is sent to the molecular sieve to complete the regeneration process. The gas, initially cooled by the waste nitrogen preheater 55, is transported to the water-cooled gas final stage cooler 511 via the waste nitrogen preheater outlet gas pipe 510. At this point, the water-cooled gas final stage cooler 511 receives ambient temperature cooling water through the cooling water inlet pipe 7. The cooling water and the initially cooled gas exchange heat a second time within the cooler, further reducing the gas temperature. The heated cooling water is then discharged through the cooling water outlet pipe 8.

[0032] like Figures 1-5 As shown, this invention illustrates a compressed gas heat recovery device in another embodiment. An automatic temperature control device 6 is provided on the outer circumferential surface of the waste nitrogen gas inlet preheater pipe 56. The automatic temperature control device 6 includes a sealed box 61. The inner side wall of the sealed box 61 is fixedly connected to the circumferential surface of the waste nitrogen gas inlet preheater pipe 56. A connecting plate 62 is fixedly connected to the side of the sealed box 61. An adjusting motor 63 is fixedly connected to the side of the connecting plate 62. A lifting screw 64 is fixedly connected to the output shaft of the adjusting motor 63. A connecting sleeve 65 is threadedly connected to the circumferential surface of the lifting screw 64. A sealing block 66 is fixedly connected to the bottom of the connecting sleeve 65.

[0033] In some examples, a sealing baffle 67 is fixedly connected to the bottom of the sealing block 66, and a connecting rod 68 is fixedly connected to the side of the sealing baffle 67. The end of the connecting rod 68 away from the sealing baffle 67 is fixedly connected to the bottom of the sealing block 66. The connecting rod 68 can guide the movement of the sealing baffle 67, making the movement of the sealing baffle 67 more stable when adjusting the flow rate of the waste nitrogen gas into the waste nitrogen preheater pipe 56, avoiding poor sealing or uneven flow adjustment due to baffle offset; at the same time, the fixed connection between the sealing baffle 67 and the sealing block 66 ensures that the adjustment action is synchronized, ensuring a stable flow rate of waste nitrogen gas in the waste nitrogen preheater pipe 56, thereby maintaining a stable heat exchange efficiency of the waste nitrogen preheater 55, and avoiding the impact of flow fluctuations on the load of the electric furnace 10 or the gas cooling effect of the gas pipe 54 after the final stage compression of the gas compressor.

[0034] The side of the sealing baffle 67 is located on the displacement trajectory of the waste nitrogen gas inlet pipe 56 of the waste nitrogen preheater, and the side of the sealing block 66 is slidably connected to the inner wall of the sealing box 61. The position design of the sealing baffle 67 ensures that it can effectively block or open the waste nitrogen gas inlet pipe 56 of the waste nitrogen preheater, accurately adjust the gas flow, and ensure that the heat exchange of the waste nitrogen preheater 55 is controllable. The sealing block 66 slides in the sealing box 61, which not only ensures the sealing of the adjustment process and avoids gas leakage or heat loss, but also reduces the wear of the adjustment components, improves the service life of the automatic temperature control device 6, and indirectly ensures the energy-saving stability of the overall device.

[0035] The top of the sealing baffle 67 is located at the bottom of the sealing block 66. There are two sealing baffles 67, which are symmetrically distributed along the vertical central axis of the sealing block 66. The two sealing baffles 67 can simultaneously adjust the flow rate from both sides of the waste nitrogen gas inlet pipe 56, avoiding unstable airflow in the pipe caused by unilateral adjustment. This ensures that the waste nitrogen gas is evenly distributed when entering the waste nitrogen preheater 55, and that the heat exchange with the gas in the gas pipe 54 after the final stage compression of the gas compressor is more complete. At the same time, the symmetrical design balances the force on the sealing block 66, reduces jamming during the adjustment process, and improves the adjustment accuracy of the automatic temperature control device 6.

[0036] A sealing top plate 69 is bolted to the top of the sealing box 61. A rectangular groove is provided on the top of the sealing top plate 69, and a sealing ring is fixedly connected to the inner wall of the rectangular groove. The bolted connection of the sealing top plate 69 facilitates the opening of the sealing box 61 for inspection and maintenance of components such as the regulating motor 63 and the lifting screw 64 inside the automatic temperature control device 6. The rectangular groove provides movement space for the connecting rod 68, and the sealing ring ensures the sealing of the groove, preventing gas leakage or heat loss. This maintains the stable gas pressure in the waste nitrogen gas inlet pipe 56 and the heat exchange efficiency of the waste nitrogen preheater 55, improving the overall reliability and long-term energy-saving effect of the device.

[0037] For example, such as Figures 1-5As shown, when the system is running, if the sensor detects that the temperature of the waste nitrogen gas at the outlet of the waste nitrogen preheater 55 is lower or higher than the target preheating temperature, or if the gas temperature fluctuation in the gas pipeline 54 after the final stage compression of the gas compressor causes heat exchange imbalance, the automatic temperature control device 6 will then start. The regulating motor 63 installed on the side of the sealing box 61 receives the control signal and enters the working state. After the regulating motor 63 starts, its output shaft drives the lifting screw 64 to rotate synchronously. The lifting screw 64 is rigidly connected to the output shaft of the regulating motor 63 to ensure power transmission without loss. Since the circumferential surface of the lifting screw 64 is threadedly connected to the connecting sleeve 65, and the bottom of the connecting sleeve 65 is fixedly connected to the sealing block 66, when the lifting screw 64 rotates, the connecting sleeve 65 is subjected to the thread friction force, which drives the sealing block 66 to slide vertically along the inner wall of the sealing box 61. The sliding cooperation between the sealing block 66 and the inner wall of the sealing box 61 not only limits the lateral displacement but also ensures the adjustment stability. Two sealing baffles 67 are fixedly connected to the bottom of the sealing block 66, and the sides of the sealing baffles 67 are connected to each other through the connecting rod 68. When the sealing block 66 slides up and down, the two sealing baffles 67 move together, their positions precisely within the flow path of the waste nitrogen gas entering the waste nitrogen preheater pipe 56. If an increase in heat exchange is needed, such as when the waste nitrogen gas preheating temperature is insufficient, the regulating motor 63 drives the sealing block 66 to rise, and the sealing baffles 67 move upward simultaneously. This expands the flow cross-section of the waste nitrogen gas entering the waste nitrogen preheater pipe 56, increasing the waste nitrogen gas flow rate and enhancing the heat exchange with the high-temperature gas inside the waste nitrogen preheater 55. If a decrease in heat exchange is needed, such as when the waste nitrogen gas preheating temperature is too high, the regulating motor 63 drives the sealing block 66 to fall, and the sealing baffles 67 move downward simultaneously, blocking part of the pipe's flow cross-section. This reduces the waste nitrogen gas flow rate and consequently lowers the heat exchange. The stepless adjustment of the flow rate of the waste nitrogen gas into the waste nitrogen preheater pipe 56 via the sealing baffle 67 allows for real-time matching of the heat exchange within the waste nitrogen preheater 55. This avoids excessive heat exchange due to excessive waste nitrogen gas flow, preventing the gas in the gas pipe 54 from cooling too low after the final stage compression of the gas compressor, which would affect subsequent processes. Conversely, it avoids insufficient heat exchange due to insufficient flow. This eliminates the need for the electric furnace 10 to consume a large amount of additional electrical energy for heating, ensuring the waste nitrogen gas preheating temperature remains stable within the target range and directly reducing the ineffective energy consumption of the electric furnace 10.

[0038] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A compressed gas heat recovery device, characterized in that, include: The bottom plate (1) is fixedly connected to the top of the bottom plate (1) with a sludge nitrogen inlet (2), the bottom plate (1) is fixedly connected to the top of the bottom plate (1) with a sludge nitrogen outlet (3), the bottom plate (1) is fixedly connected to the top of the bottom plate (1) with a bracket (4), and the bottom plate (1) is provided with a final stage compression heat recovery and reuse device (5). The final stage compression heat recovery and reuse device (5) includes a support base (51), the bottom of which is fixedly connected to the top of the base plate (1), and a gas compressor (52) is fixedly connected to the top of the support base (51). A pulley (53) is rotatably connected to the side of the gas compressor (52). A gas pipe (54) after the final stage compression of the gas compressor is passed through and connected to the side of the gas compressor (52). One end of the gas pipe (54) after the final stage compression of the gas compressor is passed through and connected to a waste nitrogen preheater (55). The bottom of the waste nitrogen preheater (55) is fixedly connected to the top of the base plate (1).

2. The compressed gas heat recovery device according to claim 1, characterized in that, The side of the waste nitrogen preheater (55) is connected to a waste nitrogen gas inlet pipe (56). The end of the waste nitrogen gas inlet pipe (56) away from the waste nitrogen preheater (55) is connected to the side of the waste nitrogen gas inlet end (2). The side of the waste nitrogen preheater (55) is connected to a waste nitrogen gas outlet pipe (57). The end of the waste nitrogen gas outlet pipe (57) away from the waste nitrogen preheater (55) is connected to the side of the waste nitrogen gas outlet end (3).

3. The compressed gas heat recovery device according to claim 2, characterized in that, The side of the waste nitrogen preheater (55) is connected to a waste nitrogen preheater gas pipe (510), one end of the waste nitrogen preheater gas pipe (510) is connected to a water-cooled gas final stage cooler (511), and the outer circumferential surface of the water-cooled gas final stage cooler (511) is fixedly connected to the inner wall of the bracket (4).

4. The compressed gas heat recovery device according to claim 3, characterized in that, An electric furnace (10) is fixedly connected to the top of the base plate (1). An electric furnace heating tube (59) is passed through and connected to the side of the electric furnace (10). One end of the electric furnace heating tube (59) is fixedly connected to the side of the waste nitrogen preheater (55).

5. A compressed gas heat recovery device according to claim 4, characterized in that, The side of the water-cooled gas final stage cooler (511) is connected to a cooling water inlet pipe (7), the side of the water-cooled gas final stage cooler (511) is connected to a cooling water outlet pipe (8), the side of the electric furnace (10) is connected to a connecting pipe (9), and one end of the connecting pipe (9) is connected to the side of the water-cooled gas final stage cooler (511).

6. A compressed gas heat recovery device according to claim 5, characterized in that, An automatic temperature control device (6) is provided on the outer circumference of the waste nitrogen gas inlet waste nitrogen preheater pipe (56). The automatic temperature control device (6) includes a sealing box (61). The inner side wall of the sealing box (61) is fixedly connected to the circumference of the waste nitrogen gas inlet waste nitrogen preheater pipe (56). A connecting plate (62) is fixedly connected to the side of the sealing box (61). An adjusting motor (63) is fixedly connected to the side of the connecting plate (62). A lifting screw (64) is fixedly connected to the output shaft of the adjusting motor (63). A connecting sleeve (65) is threadedly connected to the circumference of the lifting screw (64). A sealing block (66) is fixedly connected to the bottom of the connecting sleeve (65).

7. A compressed gas heat recovery device according to claim 6, characterized in that, A sealing baffle (67) is fixedly connected to the bottom of the sealing block (66), and a connecting rod (68) is fixedly connected to the side of the sealing baffle (67). The end of the connecting rod (68) away from the sealing baffle (67) is fixedly connected to the bottom of the sealing block (66).

8. A compressed gas heat recovery device according to claim 7, characterized in that, The side of the sealing baffle (67) is located on the displacement trajectory of the waste nitrogen gas inlet waste nitrogen preheater pipe (56), and the side of the sealing block (66) is slidably connected to the inner wall of the sealing box (61).

9. A compressed gas heat recovery device according to claim 8, characterized in that, The top of the sealing baffle (67) is located at the bottom of the sealing block (66). There are two sealing baffles (67), which are symmetrically distributed along the vertical central axis of the sealing block (66).

10. A compressed gas heat recovery device according to claim 9, characterized in that, The top of the sealing box (61) is bolted to a sealing top plate (69), and a rectangular groove is provided on the top of the sealing top plate (69). A sealing ring is fixedly connected to the inner side wall of the rectangular groove.

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