Nitrogen recovery system for all-steel radial tires

Abstract

This utility model relates to a nitrogen recovery system for all-steel radial tires, comprising a recovery pipeline, a first circulation pipeline, and a second circulation pipeline. The first and second circulation pipelines are connected in parallel to the recovery pipeline. The recovery pipeline sequentially includes a basket filter valve assembly, a gas-liquid separator, a buffer condensate drain tank, a horizontal tubular condenser, a refrigerated dryer, and a qualified nitrogen storage tank. The first circulation pipeline includes a shaped nitrogen storage tank. The second circulation pipeline sequentially includes a nitrogen booster and a high-pressure nitrogen buffer tank. A precision filter is installed in the recovery pipeline between the horizontal tubular condenser and the refrigerated dryer. A nitrogen purity meter is installed in the recovery pipeline between the refrigerated dryer and the qualified nitrogen storage tank. The beneficial effects of this utility model are: it can fully recover and utilize the nitrogen after vulcanization, improve the nitrogen recovery and utilization rate, and reduce production costs while saving energy and reducing consumption.

Description

Technical Field

[0001] This utility model belongs to the field of tire vulcanization technology, specifically relating to a nitrogen recovery system for all-steel radial tire vulcanization. Background Technology

[0002] Tire vulcanization is the final and crucial step in tire manufacturing. Traditional tire vulcanizing machines are mostly hot-plate type bladder-shaped vulcanizing machines, which heat the green tire with high-temperature saturated steam. The steam is usually provided by coal-fired boilers, but coal-fired boilers produce a large amount of toxic and harmful gases such as sulfur dioxide and carbon monoxide during operation, which can cause serious environmental pollution.

[0003] To address the pollution issues associated with traditional steam heating, existing tire vulcanization methods often use nitrogen instead of steam. Since steam heating is not required, harmful gas emissions are reduced, making it cleaner and safer. However, existing nitrogen vulcanization systems suffer from low nitrogen recovery rates after vulcanization, resulting in energy waste. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a nitrogen recovery system for all-steel radial tires, which can fully recover and utilize the nitrogen after vulcanization, improve the nitrogen recovery and utilization rate, and reduce production costs while saving energy and reducing consumption.

[0005] The objective of this utility model is achieved through the following technical solution: A nitrogen recovery system for all-steel radial tires includes a recovery pipeline, a first circulation pipeline, and a second circulation pipeline. The first and second circulation pipelines are connected in parallel to the recovery pipeline. The recovery pipeline is sequentially equipped with a basket filter valve group, a gas-liquid separator, a buffer condensate drain tank, a horizontal tubular condenser, a refrigerated dryer, and a qualified nitrogen storage tank. The first circulation pipeline is equipped with a shaped nitrogen storage tank. The second circulation pipeline is sequentially equipped with a nitrogen booster and a high-pressure nitrogen buffer tank. A precision filter is installed in the recovery pipeline between the horizontal tubular condenser and the refrigerated dryer. A nitrogen purity meter is installed in the recovery pipeline between the refrigerated dryer and the qualified nitrogen storage tank. An vent pipe is connected to the recovery pipeline between the nitrogen purity meter and the qualified nitrogen storage tank. A manual vent valve is installed on the vent pipe. A pressure transmitter is installed on the qualified nitrogen storage tank.

[0006] Furthermore, the basket filter valve assembly is provided in two sets, with pressure transmitters installed in the recovery pipelines at both ends of the basket filter valve assembly, and a bypass connected in parallel with the basket filter valve assembly is provided in the recovery pipeline.

[0007] Furthermore, both the gas-liquid separator and the buffer condensate drain tank are equipped with magnetic float level gauges and submersible level gauges.

[0008] Furthermore, the drain port of the horizontal shell-and-tube condenser is connected to a condenser drain tank via a pipeline, and the condenser drain tank is equipped with a magnetic level gauge.

[0009] Furthermore, a temperature transmitter is installed in the recovery pipeline between the refrigerated dryer and the horizontal tube-and-shell condenser, and a thermometer is installed in the recovery pipeline between the refrigerated dryer and the qualified nitrogen storage tank. The thermometer is located between the vent pipe and the nitrogen purity meter.

[0010] Furthermore, a temperature and pressure compensated vortex flow meter is installed in the recovery pipeline between the vent pipe and the qualified nitrogen storage tank.

[0011] Furthermore, a check valve is installed in the first circulation pipeline between the shaped nitrogen storage tank and the recovery pipeline.

[0012] Furthermore, the outlet of the high-pressure nitrogen buffer tank is connected to the shaped nitrogen storage tank through a third circulation pipeline. The first circulation pipeline at the outlet of the shaped nitrogen storage tank, the second circulation pipeline at the outlet of the high-pressure nitrogen buffer tank, and the third circulation pipeline are all equipped with pressure regulating valve groups and bypasses connected in parallel with the pressure regulating valve groups.

[0013] Compared with the prior art, the present invention has the following beneficial effects: This invention utilizes a structure comprising a basket filter valve assembly, a gas-liquid separator, a buffer condensate drain tank, a horizontal shell-and-tube condenser, a refrigerated dryer, a qualified nitrogen storage tank, a shaped nitrogen storage tank, a nitrogen booster, a high-pressure nitrogen buffer tank, and a precision filter. After the vulcanization process, the nitrogen emitted from the vulcanizing machine is first filtered through the basket filter valve assembly to remove impurities before entering the gas-liquid separator to separate water, impurities in the water, and nitrogen. The nitrogen after gas-liquid separation then enters the buffer condensate drain tank for buffering, flow stabilization, pressure stabilization, and condensate draining. It then enters the horizontal shell-and-tube condenser for cooling, and finally passes through a precision filter... After filtration, the nitrogen enters a refrigerated dryer for freeze drying. The nitrogen with purity meeting the process requirements is directly sent to a qualified nitrogen storage tank. The qualified nitrogen from the storage tank either enters a nitrogen setting tank directly, and then is discharged from the setting tank to the vulcanizing machine for priority setting, or it enters a nitrogen booster for pressurization, and then enters a high-pressure nitrogen storage tank. After the pressure is adjusted to meet the process requirements, it is discharged from the high-pressure nitrogen storage tank to the vulcanizing machine for the next process cycle. Ultimately, this achieves full recovery and utilization of nitrogen, saving energy and reducing consumption while lowering production costs. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the recycling pipeline in this utility model; Figure 2 This is a schematic diagram of the overall structure of the first circulation pipeline, the second circulation pipeline, and the third circulation pipeline in this utility model; Figure 3This is a schematic diagram showing the connection between the basket-type filter valve assembly and the gas-liquid separator in this utility model; Figure 4 This is a schematic diagram showing the connection between the buffer condensate drain tank and the horizontal shell-and-tube condenser in this utility model; Figure 5 This is a schematic diagram showing the connection between the horizontal shell-and-tube condenser and the refrigerated dryer in this utility model; Figure 6 This is a schematic diagram showing the connection between the refrigerated dryer and the qualified nitrogen storage tank in this utility model; Figure 7 This is a schematic diagram of the structure of the first circulation pipeline in this utility model; Figure 8 This is a schematic diagram of the structure of the second circulation pipeline in this utility model; Figure 9 This is a schematic diagram of the structure of the third circulation pipeline in this utility model.

[0015] In the diagram: 1. Basket filter valve assembly; 2. Gas-liquid separator; 3. Buffer condensate drain tank; 4. Horizontal shell-and-tube condenser; 5. Refrigerated dryer; 6. Qualified nitrogen storage tank; 7. Standardized nitrogen storage tank; 8. Nitrogen booster; 9. High-pressure nitrogen buffer tank; 10. Precision filter; 11. Nitrogen purity meter; 12. Manual vent valve; 13. Submersible level gauge; 14. Magnetic float level gauge; 15. Condenser condensate drain tank; 16. Thermometer; 17. Temperature and pressure compensated vortex flow meter; 18. Check valve; 19. Pressure regulating valve assembly. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the following description.

[0017] like Figure 1 , Figure 2 As shown, a nitrogen recovery system for all-steel radial tires includes a recovery pipeline, a first circulation pipeline, and a second circulation pipeline, which are connected in parallel to the recovery pipeline. The recovery pipeline is sequentially equipped with a basket filter valve group 1, a gas-liquid separator 2, a buffer condensate drain tank 3, a horizontal tubular condenser 4, a refrigerated dryer 5, and a qualified nitrogen storage tank 6. The first circulation pipeline is equipped with a shaped nitrogen storage tank 7, and the second circulation pipeline is sequentially equipped with a nitrogen booster 8 and a high-pressure nitrogen buffer tank 9. A precision filter 10 is installed in the recovery pipeline between the horizontal tubular condenser 4 and the refrigerated dryer 5. A nitrogen purity meter 11 is installed in the recovery pipeline between the refrigerated dryer 5 and the qualified nitrogen storage tank 6. An vent pipe is connected to the recovery pipeline between the nitrogen purity meter 11 and the qualified nitrogen storage tank 6, and a manual vent valve 12 is installed on the vent pipe. A pressure transmitter is installed on the qualified nitrogen storage tank 6.

[0018] After the vulcanization process is completed, the nitrogen emitted from the vulcanizing machine is discharged into the recovery pipeline. After entering the vulcanization power station, it first passes through the basket filter valve group 1 to remove impurities mixed in with the nitrogen. Then, the filtered nitrogen enters the gas-liquid separator 2 to separate water, impurities in the water, and nitrogen from the nitrogen. The nitrogen after gas-liquid separation enters the buffer condensate drain tank 3 for buffering, flow stabilization, pressure stabilization, and condensate draining. Then, it enters the horizontal tube condenser 4 for cooling. After passing through the precision filter 10, it enters the refrigerated dryer 5 for freeze drying. After processing, the nitrogen purity is tested by a nitrogen purity analyzer. Nitrogen with purity meeting the process requirements is directly sent to the qualified nitrogen storage tank 6. Nitrogen with unqualified purity is manually vented by opening the manual vent valve 12. The qualified nitrogen from the qualified nitrogen storage tank 6 has two possible paths: First, it enters the nitrogen setting tank directly through the first circulation pipeline, and then is discharged from the nitrogen setting tank to the vulcanizing machine for priority setting. Second, it enters the nitrogen booster 8 through the second circulation pipeline for pressurization, and then enters the high-pressure nitrogen storage tank. After the pressure is adjusted to meet the process requirements, it is discharged from the high-pressure nitrogen storage tank to the vulcanizing machine for the next process cycle. The pressure transmitter detects the pressure of the qualified nitrogen storage tank 6. When the pressure reaches 0.35MPa, the nitrogen booster 8 is started; when the pressure drops to 0.25MPa, the nitrogen booster 8 is stopped. Two nitrogen boosters 8 can be installed, one for normal use and one as a backup. After being connected to the control system, the operating status is monitored, fault alarms are triggered, and the backup machine is automatically switched.

[0019] like Figure 3 As shown, the basket filter valve assembly 1 can be configured with two sets, one for normal use and one for standby. Pressure transmitters are installed in the recovery pipelines at both ends of the basket filter valve assembly 1, and a bypass is provided in parallel with the basket filter valve assembly 1 on the recovery pipeline. The pressure transmitters detect the pressure at both ends of the basket filter valve assembly 1. The pressure transmitters are connected to the control system. When the pressure difference between the two ends of the basket filter valve assembly 1 exceeds the set value or the pressure exceeds the set value, an alarm is triggered and the electric butterfly valve is automatically switched to switch the filter valve assembly. If the standard is still not met after switching, the bypass is automatically switched so that the workshop operator can notify the maintenance personnel to clean the filter element.

[0020] like Figure 3 , Figure 4As shown, gas-liquid separator 2 performs secondary separation of nitrogen during operation. Nitrogen enters the separator tangentially, and the gas rotates. During this rotation, heavier water particles sink while lighter nitrogen particles rise, completing the first gas-liquid separation. The rising nitrogen enters gas-liquid separator 2 located at the top, where larger water molecules are separated, and smaller nitrogen molecules pass through separator 2 and are discharged, completing the second gas-liquid separation. Because the operating environment temperature inside the vulcanizing power station pit is high, especially exceeding 41℃ in summer and the nitrogen recovery gas temperature exceeds 66℃, heat dissipation into the pit would significantly worsen the operating environment of the existing power system equipment, which is detrimental to the stable operation of the vulcanizing power station system. Therefore, only gas-liquid separator 2 and the pipelines connected to it in the pit are insulated; the other pipelines are not. The buffer condensate drain tank 3 is used for buffering, stabilizing flow, stabilizing pressure, and draining condensate to ensure stable load on the post-treatment equipment. Magnetic float level gauge 14 and submersible level gauge 13 are installed on both the gas-liquid separator 2 and the buffer condensate drain tank 3 to automatically control the condensate discharged from the gas-liquid separator 2 and the buffer condensate drain tank 3.

[0021] like Figure 4 , Figure 5 As shown, the drain port of the horizontal shell-and-tube condenser 4 is connected to the condenser condensate drain tank 15 via a pipeline. A magnetic level gauge 14 is installed on the condenser condensate drain tank 15. The nitrogen gas after condensation enters the horizontal shell-and-tube condenser 4 and is fully cooled to reach the inlet temperature of the refrigerated dryer 5. The condensate discharged from the horizontal shell-and-tube condenser 4 is discharged to the condenser condensate drain tank 15, and then the discharge is automatically controlled by the magnetic level gauge 14 on the condenser condensate drain tank 15.

[0022] like Figure 1 , Figure 6 As shown, two refrigerated dryers 5 can be installed, one for normal use and one for standby; a temperature transmitter is also installed in the recovery pipeline between the refrigerated dryer 5 and the horizontal tube-and-shell condenser 4 to regulate the inlet temperature of the refrigerated dryer 5; a thermometer 16 is also installed in the recovery pipeline between the refrigerated dryer 5 and the qualified nitrogen storage tank 6, and the thermometer 16 is located between the vent pipe and the nitrogen purity meter 11 to detect the temperature of the nitrogen after freeze-drying; a temperature and pressure compensated vortex flow meter 17 is installed in the recovery pipeline between the vent pipe and the qualified nitrogen storage tank 6 to perform temperature and pressure compensated measurement of the nitrogen after freeze-drying.

[0023] like Figure 2 , Figure 7 As shown, a check valve 18 is installed in the first circulation pipeline between the nitrogen sizing tank 7 and the recovery pipeline to prioritize the pressure of the nitrogen sizing tank.

[0024] like Figure 2 , Figure 8As shown, pressure regulating valve group 19 and bypass connected in parallel with pressure regulating valve group 19 are installed on the first circulation pipeline at the outlet of the shaped nitrogen storage tank 7 and the second circulation pipeline at the outlet of the high-pressure nitrogen buffer tank 9. Pressure regulating valve group 19 is used to regulate the pressure of nitrogen before it is discharged to the vulcanizing machine. Two sets of pressure regulating valve group 19 are set, one for normal use and one for standby. The bypass can ensure uninterrupted production.

[0025] like Figure 2 , Figure 9 As shown, the outlet of the high-pressure nitrogen buffer tank 9 is also connected to the shaping nitrogen storage tank 7 through a third circulation pipeline. A pressure regulating valve group 19 is installed in the third circulation pipeline, and a bypass connected in parallel with the pressure regulating valve group 19 is connected to the third circulation pipeline to automatically regulate the pressure of the shaping nitrogen storage tank 7, so as to ensure the shaping pressure during production start-up and system failure, and to ensure uninterrupted production.

[0026] Finally, although embodiments of the present invention have been shown and described above, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A nitrogen vulcanization recovery system for all-steel radial tires, characterized in that: It includes a recovery pipeline, a first circulation pipeline and a second circulation pipeline. The first circulation pipeline and the second circulation pipeline are connected in parallel to the recovery pipeline. The recovery pipeline is provided with a basket filter valve group (1), a gas-liquid separator (2), a buffer condensate drain tank (3), a horizontal tubular condenser (4), a refrigerated dryer (5), and a qualified nitrogen storage tank (6) in sequence. The first circulation pipeline is provided with a shaped nitrogen storage tank (7). The second circulation pipeline is provided with a nitrogen booster (8) and a high-pressure nitrogen buffer tank (9) in sequence. The recovery pipeline between the horizontal tubular condenser (4) and the refrigerated dryer (5) is provided with a precision filter (10). The recovery pipeline between the refrigerated dryer (5) and the qualified nitrogen storage tank (6) is provided with a nitrogen purity meter (11). The recovery pipeline between the nitrogen purity meter (11) and the qualified nitrogen storage tank (6) is connected with an vent pipe. The vent pipe is provided with a manual vent valve (12). The qualified nitrogen storage tank (6) is provided with a pressure transmitter.

2. The nitrogen recovery system for all-steel radial tires according to claim 1, characterized in that: The basket filter valve group (1) is provided in two sets. Pressure transmitters are provided in the recovery pipelines at both ends of the basket filter valve group (1). A bypass is provided in the recovery pipeline in parallel with the basket filter valve group (1).

3. The nitrogen recovery system for all-steel radial tires according to claim 1, characterized in that: Both the gas-liquid separator (2) and the buffer condensate drain tank (3) are equipped with magnetic float level gauges (14) and submersible level gauges (13).

4. The nitrogen vulcanization recovery system for all-steel radial tires according to claim 1, characterized in that: The drain port of the horizontal shell-and-tube condenser (4) is connected to the condenser drain tank (15) through a pipeline, and the condenser drain tank (15) is equipped with a magnetic float level gauge (14).

5. The nitrogen vulcanization recovery system for all-steel radial tires according to claim 1, characterized in that: A temperature transmitter is also provided in the recovery pipeline between the refrigerated dryer (5) and the horizontal tube condenser (4), and a thermometer (16) is also provided in the recovery pipeline between the refrigerated dryer (5) and the qualified nitrogen storage tank (6). The thermometer (16) is located between the vent pipe and the nitrogen purity meter (11).

6. The nitrogen vulcanization recovery system for all-steel radial tires according to claim 1, characterized in that: A temperature and pressure compensated vortex flow meter (17) is installed in the recovery pipeline between the vent pipe and the qualified nitrogen storage tank (6).

7. The nitrogen vulcanization recovery system for all-steel radial tires according to claim 1, characterized in that: A check valve (18) is installed in the first circulation pipeline between the fixed nitrogen storage tank (7) and the recovery pipeline.

8. The nitrogen vulcanization recovery system for all-steel radial tires according to claim 1, characterized in that: The outlet of the high-pressure nitrogen buffer tank (9) is also connected to the shaped nitrogen storage tank (7) through a third circulation pipeline. The first circulation pipeline at the outlet of the shaped nitrogen storage tank (7), the second circulation pipeline at the outlet of the high-pressure nitrogen buffer tank (9), and the third circulation pipeline are all equipped with pressure regulating valve group (19) and bypass connected in parallel with pressure regulating valve group (19).

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