An energy-saving thermal system for tire vulcanization

Abstract

This invention discloses an energy-saving thermal system for tire vulcanization, comprising a heat recovery system, a cascaded stepped heating system, a valley electricity storage system, a nitrogen heat exchange system, a constant temperature heat exchange system, and a nitrogen circulation system. The heat recovery system, cascaded stepped heating system, nitrogen heat exchange system, constant temperature heat exchange system, and nitrogen circulation system are connected in series. The nitrogen heat exchange system and the cascaded stepped heating system are bidirectionally connected to achieve medium circulation. The nitrogen circulation system also has a branch connected to the nitrogen heat exchange system to achieve nitrogen circulation. The valley electricity storage system is a distributed structure, sequentially arranged on the heat recovery system, cascaded stepped heating system, nitrogen heat exchange system, constant temperature heat exchange system, and nitrogen circulation system for auxiliary heating. This invention solves the economic burden of coal-to-electricity conversion and the problem of workshop thermal pollution in the vulcanization process, improves the working environment temperature, reduces energy costs and waste, and improves production efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of tire manufacturing technology, specifically relating to an energy-saving thermal system for tire vulcanization. Background Technology

[0002] In tire manufacturing, vulcanization is one of the most energy-intensive processes. Currently, the industry commonly uses steam as the vulcanizing medium, and the production equipment continuously releases a large amount of heat during operation, resulting in workshop temperatures consistently ranging from 35°C to 55°C, often exceeding 50°C in summer. Furthermore, in response to environmental policies, manufacturing companies are actively promoting "coal-to-electricity" energy alternatives and gradually adopting nitrogen as a replacement for traditional steam.

[0003] However, the existing technology system still faces serious challenges: First, the large amount of waste heat generated during the vulcanization process continues to diffuse into the workshop environment, causing the workshop temperature to remain in the high-temperature range of 35℃ to 55℃ year-round, and easily exceeding 50℃ during the summer. This high-temperature environment not only seriously threatens the occupational health and safety of workers, but also causes continuous heat loss and thermal pollution problems to the surrounding environment. Second, although "coal-to-electricity" has significant environmental benefits, the direct cost of electricity is much higher than that of traditional coal-fired power, resulting in a substantial increase in energy consumption expenditures for enterprises and weakening the market competitiveness of their products.

[0004] Therefore, there is an urgent need for a thermal system that can solve the above problems. Utility Model Content

[0005] This invention overcomes the shortcomings of the prior art and provides an energy-saving thermal system for tire vulcanization. This invention solves the economic burden of coal-to-electricity conversion and the problem of workshop thermal pollution in the vulcanization process, improves the working environment temperature, and at the same time reduces energy consumption costs and waste through efficient energy utilization, thereby improving production efficiency.

[0006] The technical solution adopted by this utility model to solve the problems existing in the prior art is: An energy-saving thermal system for tire vulcanization includes a heat recovery system, a cascaded heating system, a valley electricity storage system, a nitrogen heat exchange system, a constant temperature heat exchange system, and a nitrogen circulation system. The heat recovery system, cascaded heating system, nitrogen heat exchange system, constant temperature heat exchange system, and nitrogen circulation system are connected in series. The nitrogen heat exchange system and the cascaded heating system are bidirectionally connected to achieve medium circulation. The nitrogen circulation system also has a branch connected to the nitrogen heat exchange system to achieve nitrogen circulation.

[0007] The off-peak electricity storage system is specifically a distributed structure, which is sequentially installed on the heat recovery system, the cascade heating system, the nitrogen heat exchange system, the constant temperature heat exchange system, and the nitrogen circulation system for auxiliary heating.

[0008] Preferably, the heat recovery system includes a workshop air collection duct. The workshop air collection duct connects to a fan, which then transfers waste heat from the workshop to the connected evaporator room via a main air inlet duct. The evaporator room, compressor, and heat exchanger are connected in series. The outlet of the heat exchanger is connected to a hot water pipe via a water pump. The hot water pipe is connected to one end of the heat exchanger on the high-temperature side of the primary hot water storage tank via a solenoid valve. The other end is connected to the inlet of the heat exchanger via a solenoid valve.

[0009] The evaporator room consists of one or more units, and the connection relationship of each evaporator room is specifically a series connection, a parallel connection, or a series-parallel connection.

[0010] The evaporator room is specifically a shell made of insulating material, inside which an air source heat pump unit is installed. A gradient air outlet duct is installed on the upper part of the shell and connects to the air outlet of the air source heat pump unit. A gradient air inlet duct is installed on one side of the shell. A fresh air inlet valve for the machine room is installed on the other side.

[0011] Preferably, the cascaded heating system includes a high-temperature water source heat pump. The low-temperature side inlet pipe of the high-temperature water source heat pump is connected to one end of the low-temperature side of the primary heat storage tank via a solenoid valve. The other end is connected to the low-temperature side return pipe of the high-temperature water source heat pump via a solenoid valve. The high-temperature side outlet pipe of the high-temperature water source heat pump is connected to the high-temperature side of the heat exchanger inside the secondary heat storage tank via a solenoid valve and then connected to the high-temperature side of the high-temperature water source heat pump via a return pipe, forming a loop.

[0012] The primary heat storage tank is equipped with flange-type off-peak electricity heating rods on both sides. The secondary heat storage tank is equipped with flange-type off-peak electricity heating rods on both the upper and lower sides.

[0013] Preferably, the nitrogen heat exchange system is characterized by a symmetrical structure of the first heat exchange tank and the second heat exchange tank, specifically including a medium passage and a nitrogen passage.

[0014] The media pathway is as follows: the low-temperature side outlet of the heat exchanger inside the secondary heat storage tank is connected to the first heat exchange tank body through a water pump and a solenoid valve, and the other path is connected to the second heat exchange tank. The first heat exchange tank body and the second heat exchange tank are provided with outlets that are connected to the low-temperature side inlet of the heat exchanger inside the secondary heat storage tank through a solenoid valve to form a loop.

[0015] The nitrogen gas pathway is specifically as follows: the nitrogen inlet of the first heat exchange tank is connected to both a nitrogen storage tank and a first nitrogen recovery tank via gas paths. The nitrogen inlet of the second heat exchange tank is connected to both a nitrogen storage tank and a second nitrogen recovery tank via gas paths. The nitrogen outlets of the first and second heat exchange tanks are connected to the nitrogen inlet of both the first and second isothermal heat exchange tanks, respectively.

[0016] Both the first and second heat exchange tanks are equipped with nitrogen heat exchangers with off-peak electricity heating rods for heating the medium.

[0017] Preferably, the constant temperature heat exchange system is as follows: the first and second constant temperature heat exchange tanks are symmetrically structured. Specifically, the heat medium input end of the constant temperature heat exchange tank is connected to the heat medium output end of the constant temperature heat exchange tank in sequence through a solenoid valve, a rural electricity storage tank, and a water pump. The first and second constant temperature heat exchange tanks are respectively connected to the first and second rural electricity storage tanks. Rural electricity heating rods of the constant temperature heat exchange system are provided on the upper and lower sides of the rural electricity storage tank. The nitrogen output ends of the first and second constant temperature heat exchange tanks are respectively connected to the first and second high-pressure storage tanks through high-pressure pumps. Preferably, the nitrogen circulation system is as follows: the first high-pressure storage tank is connected to the nitrogen inlet pipe of the central mechanism through a solenoid valve and connected to the central mechanism for nitrogen supply. The nitrogen output end of the central mechanism is connected to the nitrogen discharge pipe through a solenoid valve and connected to the first nitrogen recovery tank. One output end of the first nitrogen recovery tank is connected to the nitrogen storage tank through a solenoid valve gas path. The other output end is connected to the nitrogen input end of the first heat exchange tank through a solenoid valve gas path. The second high-pressure storage tank has upper and lower heating plate outlets, which are connected to the upper and lower heating plates via nitrogen inlet pipes for nitrogen supply. The nitrogen outlets of both the upper and lower heating plates are connected to a second nitrogen recovery tank. One outlet of the second nitrogen recovery tank is connected to the nitrogen storage tank via a solenoid valve, and the other is connected to the nitrogen inlet of the second heat exchange tank via a solenoid valve. The nitrogen circulation system also includes a PSA nitrogen generator. The PSA nitrogen generator is connected to the nitrogen storage tank for nitrogen replenishment.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows: This invention utilizes multiple air-source heat pumps connected in series to efficiently recover the continuously dissipated medium-to-high temperature waste heat from the vulcanization workshop. By maintaining a high heating efficiency ratio under specific temperature conditions for the incoming air, the generated hot water is stored in a primary heat storage device, significantly alleviating heat pollution in the workshop and optimizing the working environment. Combined with off-peak electricity heating devices for energy storage during periods of low electricity prices, and a secondary cascade heat pump to achieve a rapid increase in medium temperature, a collaborative energy-saving mechanism of waste heat recovery and off-peak electricity utilization is formed, drastically reducing the energy consumption of traditional heating methods. The nitrogen circulation system maintains a preset pressure range through a high-pressure power unit to achieve closed-loop operation. The heated nitrogen is directly returned to the system for recycling via a recovery device, completely avoiding the problem of heat loss from the steam medium. Simultaneously, the airflow control component optimizes the incoming air temperature, and the modularly designed off-peak electricity storage unit adapts to production line needs, reducing equipment modification investment and long-term operation and maintenance costs, effectively balancing the electricity cost pressure of the "coal-to-electricity" energy transition. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 This is a schematic diagram of an energy-saving thermal system for tire vulcanization according to the present invention. Figure 2 This is a schematic diagram of the evaporator room in an energy-saving thermal system for tire vulcanization according to the present invention. Figure 3 This is a schematic diagram of the nitrogen heat exchange system and the constant temperature heat exchange system in an energy-saving thermal system for tire vulcanization according to this utility model. Figure 4 This invention relates to a performance table of an air source heat pump in an energy-saving thermal system for tire vulcanization.

[0021] In the diagram: 101 Air source heat pump unit, 102 Workshop air collection duct, 103 Primary hot water storage tank, 104 Main air inlet duct, 105 Gradient air inlet duct, 106 Gradient air outlet duct, 107 Fan, 108 Water pump, 109 Evaporator, 110 Heat exchanger, 111 Compressor, 112 Hot water pipe, 113 Return water pipe, 114 Evaporator room, 115 Fresh air inlet valve for the machine room; 201 High-temperature water source heat pump, 202 Secondary heat storage tank, 203 Inlet pipe, 204 Return pipe, 205 In-tank heat exchanger, 206 Heat outlet pipe, 207 Heat return pipe; 301 Primary heat storage tank off-peak electricity heating rod, 302 Secondary heat storage tank off-peak electricity heating rod, 303 Nitrogen heat exchanger off-peak electricity heating rod, 304 Constant temperature heat exchange system off-peak electricity heating rod, 305a First off-peak electricity storage tank, 305b Second off-peak electricity storage tank, 306 Circulation pump, 307 Heat transfer oil; 401a First heat exchange tank, 401b Second heat exchange tank, 402 Nitrogen-heated heat exchanger; 501a First constant temperature heat exchange tank, 501b Second constant temperature heat exchange tank, 502 Nitrogen secondary heat exchanger, 503 Heat medium, 504 Temperature-regulating electric heating rod; 601 PSA nitrogen generator, 602 nitrogen storage tank, 603a first high-pressure storage tank, 603b second high-pressure storage tank, 604a first nitrogen recovery tank, 604b second nitrogen recovery tank, 605 high-pressure pump, 606 nitrogen inlet pipe of central mechanism, 607 nitrogen pipe, 608 nitrogen inlet pipe of upper and lower hot plates, 609 nitrogen return pipe. Detailed Implementation

[0022] The specification and claims use certain terms to refer to specific components. Those skilled in the art will understand that hardware manufacturers may use different names to refer to the same component. This specification and claims do not distinguish components based on differences in name, but rather on differences in function. The term "comprising" throughout the specification and claims is an open-ended term and should be interpreted as "comprising but not limited to." "Approximately" means that within an acceptable margin of error, those skilled in the art can solve the technical problem and substantially achieve the technical effect within a certain margin of error.

[0023] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not 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.

[0024] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0025] The following is in conjunction with the appendix Figures 1-3 This invention provides a more detailed description of an energy-saving thermal system for tire vulcanization, but this is not intended to limit the scope of the invention.

[0026] An energy-saving thermal system for tire vulcanization includes a heat recovery system 1, a cascaded stepped heating system 2, a valley electricity storage system 3, a nitrogen heat exchange system 4, a constant temperature heat exchange system 5, and a nitrogen circulation system 6. The heat recovery system 1, cascaded stepped heating system 2, nitrogen heat exchange system 4, constant temperature heat exchange system 5, and nitrogen circulation system 6 are connected in series. The nitrogen heat exchange system 4 and the cascaded stepped heating system 2 are bidirectionally connected to achieve medium circulation. The nitrogen circulation system 6 also has a branch connected to the nitrogen heat exchange system 4 to achieve nitrogen circulation. The valley electricity storage system 3 is specifically a distributed structure, sequentially arranged on the heat recovery system 1, cascaded stepped heating system 2, nitrogen heat exchange system 4, constant temperature heat exchange system 5, and nitrogen circulation system 6 for auxiliary heating.

[0027] The heat recovery system 1 includes a workshop air collection duct 102, which is connected to a fan 107. The fan 107 transmits the waste heat from the workshop to the connected evaporator room 114 through the main air inlet duct 104. The evaporator room 114, the compressor 111, and the heat exchanger 110 are connected in series. The outlet of the heat exchanger 110 is connected to a hot water pipe 112 through a water pump 108. The hot water pipe 112 is connected to one end of the heat exchanger on the high-temperature side of the primary hot water storage tank 103 through a solenoid valve. The other end is connected to the inlet of the heat exchanger 110 through a solenoid valve and a return water pipe 113.

[0028] The specific function of the heat recovery system 1 is to recover the heat emitted by the heating equipment in the workshop through an air source heat pump device for primary heating, converting the waste heat of the vulcanization workshop into hot water and storing it in the primary hot water storage tank 103. The workshop air duct 102 transports the hot air from the top of the workshop to the primary evaporator room 114 under the action of the fan 107. After passing through the evaporator 109, it enters the secondary evaporator room via the gradient air outlet duct 106, and after evaporation, it enters the tertiary evaporator room via the gradient air outlet duct 106, and so on, until the temperature drops to about 25°C. The heat medium with heat output from the air source heat pump device enters the heat exchanger 110 through the compressor 111 to exchange heat with water, and is then pumped into the hot water storage tank 103 by the water pump 108.

[0029] The evaporator room 114 consists of one or more units. The connection relationship of each evaporator room can be series connection, parallel connection, or series-parallel connection. The specific connection method depends on whether the exhaust gas temperature of the last evaporator room is around 25°C. The purpose of connecting the evaporator rooms is to keep the air source heat pump operating at a high coefficient of performance (COP) condition, reducing the significant impact of ambient temperature on the heat pump's COP. 25°C is the optimal operating condition for the air source heat pump's COP.

[0030] This utility model provides an embodiment in which, when the ambient temperature output from the air duct in a summer workshop is 55°C, the air is absorbed in a stepped manner by seven evaporators connected in series. The temperature difference between the inlet and outlet of the evaporators is about 5°C, which can roughly obtain output temperatures of 55°C, 50°C, 45°C, 40°C, 35°C, 30°C, and 25°C, with a minimum of 25°C, thereby achieving the optimal operating conditions for the thermal efficiency ratio of the air source heat pump.

[0031] The evaporator room 114 is specifically a shell made of insulation material, and an air source heat pump device 101 is installed inside. A gradient air outlet duct 106 is installed on the upper part of the shell and connected to the air outlet of the air source heat pump device 101. A gradient air inlet duct 105 is installed on one side of the shell, and a fresh air inlet valve 115 is installed on the other side.

[0032] The shell of the evaporator room 114 is specifically constructed of a light steel structure insulated composite panel. In this embodiment, the specific volume of the evaporator is length × height × width, and the specific volume of the evaporator room 114 is length × height × width 5000 × 4000 × 3800 (mm). The vertical column material of the evaporator room 114 is specifically selected as hot-dip galvanized 80×80×2.5 rectangular steel pipe. The horizontal bracing material of the evaporator room 114 is the same as that of the vertical column material, specifically selected as 40×60×2.0 rectangular steel pipe. The enclosure panel of the evaporator room 114 is 80mm thick PU foam color steel composite panel.

[0033] The specific dimensions of the heat recovery air inlet on one side of the evaporator room 114 are 1200×600 (mm), and the specific dimensions of the fresh air inlet valve 115 or fresh air electric damper on the other side are 800×800 (mm). A dust removal filter is installed on the fresh air inlet.

[0034] The fresh air inlet valve 115 is used to control the entry of fresh air. When the ambient temperature is low, the fresh air inlet valve 115 is controlled to reduce the amount of mixed air entering; when the temperature is below a threshold, the fresh air inlet valve 115 is controlled to close the fresh air entry; when the fresh air temperature is higher than the heat recovery air inlet, the fresh air inlet valve 115 is fully opened to draw in a large amount of ambient fresh air.

[0035] like Figure 4 As shown, the seasonal temperature difference and diurnal temperature difference in the environment cause instability in the energy efficiency ratio output of the air source heat pump. However, the energy efficiency ratio output can be effectively controlled by the design of the connection between the evaporator room 114 and the evaporator.

[0036] The primary hot water storage tank 103 is specifically a large-capacity tank, which can be a surface-mounted metal insulated tank or an underground hot water storage tank. The specific tank material selected depends on the energy consumption of the large tire factory, and includes, but is not limited to, metal tanks, corrosion-resistant carbon steel tanks, SUS304 stainless steel tanks, or FRP fiberglass tanks. This primary tank or multiple smaller-capacity tanks are connected together. The volume of the primary hot water storage tank 103 also needs to consider heat demand. In addition to the heat generated by heat recovery, it is necessary to consider whether there are extreme low temperatures in the area of ​​use, and the heat generated by off-peak electricity must meet the daily usage demand.

[0037] In this embodiment, underground heat storage is used, which reduces the surface space while providing good underground insulation.

[0038] In this embodiment, the primary hot water storage tank 103 is specifically equipped with a heat exchanger, which includes a low-temperature side and a high-temperature side. The hot water in the heat exchanger 110 is transported to the high-temperature side of the heat exchanger in the primary hot water storage tank 103 by the water pump 108. Heat exchange occurs through the heat medium in the hot water storage tank, causing the temperature of the heat medium in the low-temperature side to rise.

[0039] This utility model also includes a second embodiment, which differs from the first embodiment in the structure of the primary hot water storage tank 103. The primary hot water storage tank 103 in this second embodiment is equipped with an inlet and an outlet, and contains a low-temperature heat exchanger. Specifically, hot water is pumped from the heat exchanger 110 to the primary hot water storage tank 103 via a water pump 108. The hot water is directly injected into the primary hot water storage tank 103 through the inlet, and after heat exchange through the low-temperature heat exchanger, it returns to the heat exchanger 110 through the outlet.

[0040] Both sides of the primary hot water storage tank 103 are equipped with flange-type off-peak electricity heating rods 301. The off-peak electricity heating rods 301 operate by heating during off-peak electricity hours. Since the unit electricity price during off-peak hours is about one-third of the peak-valley unit electricity price, energy saving is achieved. The off-peak electricity heating rods 301 are mainly used in low-temperature situations. When the temperature is low, and the evaporator absorbs insufficient heat after closing the fresh air inlet valve 115, the off-peak electricity heating rods 301 increase their heating power to store energy and compensate for the heat loss. The off-peak electricity heating rods 301 can be a single high-power off-peak electricity heating rod or multiple low-power off-peak electricity heating rods. In this embodiment, multiple low-power off-peak electricity heating rods are used for multi-point distributed heating, each with a power range of 10kW-300kW, and a total power between 1000kW-10000kW.

[0041] The cascaded heating system 2 includes a high-temperature water source heat pump 201. The low-temperature side inlet pipe 203 of the high-temperature water source heat pump 201 is connected to one end of the low-temperature side of the primary hot water storage tank 103 via a solenoid valve, and the other end is connected to the low-temperature side return pipe 204 of the high-temperature water source heat pump 201 via a solenoid valve. The high-temperature side heat outlet pipe 206 of the high-temperature water source heat pump 201 is connected to the high-temperature side of the in-tank heat exchanger 205 of the secondary heat storage tank 202 via a solenoid valve, and then connected to the high-temperature side of the high-temperature water source heat pump 201 via a heat return pipe 207 to form a loop. Flange-type secondary heat storage tank off-peak electricity heating rods 302 are installed on both the upper and lower sides of the secondary heat storage tank 202.

[0042] The cascaded stepped heating heat pump system is a two-stage heating system of this invention. Based on the hot water temperature of 60-70℃ under the action of the primary heating system of the heat recovery system, the high-temperature water source heat pump 201 raises the medium temperature in the secondary heat storage tank 202 to 130-170℃. In addition to the heating water source heat pump, the secondary heat storage tank off-peak electricity heating rod 302 on the secondary heat storage tank 202 starts heating during off-peak electricity hours. The specific selection and operation mode of the secondary heat storage tank off-peak electricity heating rod 302 are the same as those of the primary heat storage tank off-peak electricity heating rod 301.

[0043] The difference between the secondary heat storage tank 202 and the primary heat storage tank 103 in this embodiment is that the temperature of the medium inside the secondary heat storage tank 202 is around 130-170℃, and the pressure is around 0.8 MPa. Therefore, a pressure of at least 1.2 MPa is required. The heat from the high-temperature water source heat pump 201 is used to heat the heat medium inside the secondary heat storage tank through the heat exchanger 205 installed inside the tank.

[0044] The specific number of high-temperature water source heat pumps 201 depends on the required temperature and the temperature of the medium inside the secondary heat storage tank 202. In this embodiment, one high-temperature water source heat pump 201 is specifically selected.

[0045] The nitrogen heat exchange system 4 is a three-stage heating system, mainly for heat exchange between the heat medium and nitrogen, that is, heating the nitrogen by heating the nitrogen heat exchanger 402. Specifically, the nitrogen heat exchange system 4 consists of a first heat exchange tank 401a and a second heat exchange tank 401b with a symmetrical structure, which specifically includes a medium passage and a nitrogen passage.

[0046] The media pathway is as follows: the low-temperature outlet of the heat exchanger 205 inside the secondary heat storage tank 202 is connected to the first heat exchange tank 401a via a water pump and a solenoid valve, and to the second heat exchange tank 401b via another route. The first heat exchange tank 401a and the second heat exchange tank 401b are provided with outlets that are connected to the low-temperature inlet of the heat exchanger 205 inside the secondary heat storage tank 202 via solenoid valves to form a loop, thereby forming a heat medium circulation, which transfers the heat from the secondary heat storage tank to the heat medium inside the tertiary heat exchange tank.

[0047] The nitrogen gas passage is specifically as follows: the nitrogen gas input end of the first heat exchange tank 401a is connected to the nitrogen storage tank 602 and the first nitrogen recovery tank 604a respectively; the nitrogen gas input end of the second heat exchange tank 401b is connected to the nitrogen storage tank 602 and the second nitrogen recovery tank 604b respectively; and the nitrogen gas output ends of the first heat exchange tank 401a and the second heat exchange tank 401b are connected to the nitrogen gas input ends of the first constant temperature heat exchange tank 501a and the second constant temperature heat exchange tank 501b respectively.

[0048] Because the temperature requirements of the central mechanism of the tire vulcanizing machine are higher than those of the upper and lower heating plates, the heat exchange tank is divided into a first heat exchange tank 401a and a second heat exchange tank 401b. Both the first heat exchange tank 401a and the second heat exchange tank 401b are equipped with nitrogen heat exchangers and off-peak electricity heating rods 303 for heating the medium, achieving more precise temperature control. The specific selection of the heat exchange tank is related to the heat medium. When pure water is used as the heat medium, the heat exchange tank is specifically a pressure vessel with a pressure resistance of 12 kg / cm² or higher; when heat transfer oil is used as the heat medium, the heat exchange tank is specifically an atmospheric pressure vessel. The materials of the heat exchange tank include, but are not limited to, corrosion-resistant carbon steel or SUS304 stainless steel.

[0049] The nitrogen heating heat exchanger 402 is specifically a coil type, a finned tube type with internal and external threads, or a shell-and-tube type. When the nitrogen heating heat exchanger 402 is installed horizontally, it is important to ensure that the inlet of the heat medium and the nitrogen inlet are in opposite directions, and the nitrogen heating heat exchanger 402 is installed at the nitrogen inlet end. One or more heat exchange tanks are provided, the specific number depending on the temperature requirements.

[0050] After undergoing primary heat exchange in the nitrogen heat exchange system 4, nitrogen enters the constant temperature heat exchange system 5 for secondary heat exchange. The constant temperature heat exchange system 5 heats and regulates the temperature to the required constant temperature through the temperature-regulating electric heating rod 504, the off-peak electricity heating rod 304 of the constant temperature heat exchange system, and the first off-peak electricity storage tank 305a and the second off-peak electricity storage tank 305b connected to the off-peak electricity heating rod 304 of the constant temperature heat exchange system, and then outputs the temperature to the high-pressure pump 605.

[0051] The constant temperature heat exchange system 5 is specifically as follows: the first constant temperature heat exchange tank 501a and the second constant temperature heat exchange tank 501b have a symmetrical structure. Specifically, the heat medium input end of the constant temperature heat exchange tank is connected to the heat medium output end of the constant temperature heat exchange tank in sequence through a solenoid valve, a valley electricity storage tank and a water pump. The first constant temperature heat exchange tank 501a and the second constant temperature heat exchange tank 501b are respectively connected to the first valley electricity storage tank 305a and the second valley electricity storage tank 305b. The valley electricity storage tank contains heat transfer oil 307, and valley electricity heating rods 304 of the constant temperature heat exchange system are set on the upper and lower sides of the valley electricity storage tank. The heat medium is circulated through the circulation pump 306 to perform heat storage and heat dissipation during valley electricity periods. The nitrogen output ends of the first constant temperature heat exchange tank 501a and the second constant temperature heat exchange tank 501b are respectively connected to the first high pressure storage tank 603a and the second high pressure storage tank 603b through a high pressure pump 605. Both the first constant temperature heat exchange tank 501a and the second constant temperature heat exchange tank 501b are equipped with a nitrogen secondary heat exchanger 502, and the heat exchange between the heat medium 503 in the tank is realized through the heat medium 503 in the tank.

[0052] The power selection of the specific temperature-regulating electric heating rod 504 and the off-peak electricity heating rod 304 in the constant temperature heat exchange system is related to the required constant temperature. The heat transfer medium of the first constant temperature heat exchange tank 501a, the second constant temperature heat exchange tank 501b, the first off-peak electricity storage tank 305a, and the second off-peak electricity storage tank 305b is all heat transfer oil, and the specific heat transfer oil selected is L-Q13300 or L-QD300 closed system.

[0053] In this embodiment, the heat medium circulates between the constant-temperature heat exchange tank and the off-peak electricity storage tank. Off-peak electricity is used to heat the heat medium in the off-peak electricity storage tank to a temperature slightly higher than the constant-temperature output nitrogen temperature by 8-10°C, and then the heat medium circulates with the constant-temperature tank. The unit power of the off-peak electricity heating rod 304 in the constant-temperature heat exchange system is specifically 10-200 kW, and the total power range is specifically 1000-10000 kW.

[0054] This utility model also includes an embodiment three, which differs from embodiment one in that the heat medium is a closed-loop heating type heat transfer oil. Therefore, the constant temperature heat exchange system 5 is an atmospheric pressure heating system, that is, an electric heating rod is directly installed on the constant temperature heat exchange tank to heat and fine-tune the heat medium to ensure that the output nitrogen temperature meets the temperature requirements of use. The heat transfer oil is specifically a closed type such as L-QD250, L-QC300 or L-QB250.

[0055] The nitrogen circulation system 6 is specifically configured as follows: the first high-pressure storage tank 603a is connected to the nitrogen inlet pipe 606 of the central mechanism via a solenoid valve and is connected to the central mechanism for nitrogen supply. The nitrogen output end of the central mechanism is connected to the nitrogen discharge pipe 607 via a solenoid valve and is connected to the first nitrogen recovery tank 604a. One output end of the first nitrogen recovery tank 604a is connected to the nitrogen storage tank 602 via a solenoid valve air path, and the other is connected to the nitrogen input end of the first heat exchange tank 401a via a solenoid valve air path. The second high-pressure storage tank 603b has upper and lower heat plate output ports, and is connected to the upper and lower heat plates via upper and lower heat plate nitrogen inlet pipes 608 respectively for nitrogen supply. The nitrogen output ends of the upper and lower heat plates are both connected to the second nitrogen recovery tank 604b via a nitrogen return pipe 609. One output end of the second nitrogen recovery tank 604b is connected to the nitrogen storage tank 602 via a solenoid valve air path, and the other is connected to the nitrogen input end of the second heat exchange tank 401b via a solenoid valve air path.

[0056] The nitrogen circulation system 6 is also equipped with a PSA nitrogen generator 601, which is connected to a nitrogen storage tank 602 for nitrogen replenishment.

[0057] Nitrogen gas passing through the constant temperature heat exchange system 5 is pumped into the high-pressure storage tank by the high-pressure pump 605. The high-pressure storage tank then delivers the nitrogen gas to the central mechanism and upper and lower heating plates of the tire vulcanizing machine through the solenoid valves on the pipes. After the nitrogen gas has been heated, it enters the nitrogen recovery tank through the solenoid valves on the pipes.

[0058] The nitrogen circulation system 6 also includes a PSA nitrogen generator 601. Nitrogen generated by the PSA nitrogen generator 601 is transported to a nitrogen storage tank 602. After being heated by the nitrogen heat exchange system 4 and the constant temperature heat exchange system 5, it is then pumped to a high-pressure storage tank by a high-pressure pump 605. From there, it is delivered to the central mechanism and upper and lower heating plates of the tire vulcanizing machine via solenoid valves on the pipes. The heated nitrogen then enters a nitrogen recovery tank through a solenoid valve on the pipe, completing the heating and cooling cycle before entering the next heating cycle. Nitrogen stored in the nitrogen recovery tank at a certain temperature and pressure directly enters the nitrogen heat exchange system 4. The PSA nitrogen generator 601 is mainly used to replenish nitrogen lost during operation.

[0059] The specific working principle of this utility model is as follows: Waste heat generated by the heating equipment in the tire workshop is recovered and converted into a heat medium through the air source heat pump device 101 of the heat recovery system 1, thus completing the first-stage heating. The heat medium is stored in the first-stage hot water storage tank 103. Simultaneously, during off-peak electricity periods, the off-peak electricity heating rod 301 of the first-stage hot water storage tank is activated to heat the heat medium. The temperature of the heat medium for the first-stage heating is between 60-70℃.

[0060] The cascaded stepped heating system 2, which performs secondary heating on the basis of primary heating, adopts a cascaded high-temperature water source heat pump 201, and works in conjunction with the off-peak electricity heating rod 302 in the secondary heat storage tank to heat the medium to between 130-170℃ and store it in the secondary heat storage tank 202 to complete the secondary heating.

[0061] The nitrogen medium's heat is transferred to the nitrogen gas via the nitrogen heat exchange system 4, and then enters the constant temperature heat exchange system 5. Precise temperature control via a power storage tank and temperature-regulating electric heaters ensures the nitrogen gas is heated to the required temperature. A high-pressure pump 605 then pumps the nitrogen gas to the central mechanism and upper and lower heating plates of the tire vulcanizing machine for heating. After heating, the gas is transferred to the nitrogen recovery tank, completing one heating cycle.

[0062] This utility model has a total of three stages of heating. The first stage of heating is a heat recovery system 1, the second stage of heating is a cascade stepped heating system 2, the third stage of heating is a nitrogen heat exchange system 4, and the fourth stage of heating is a constant temperature heat exchange system 5. The energy gain of the first and second stages of heating is about 95-90%, and the energy gain of the third and fourth stages of fine-tuning heating is about 5-10%.

[0063] This invention solves the environmental problem of waste heat in tire workshops, improves the working environment temperature for workers and promotes their health, and also has significant economic benefits in terms of energy saving and cost reduction. It is an excellent technical solution for coal-to-electricity conversion.

[0064] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. An energy-saving thermal system for tire vulcanization, characterized in that, It includes a heat recovery system (1), a cascade stepped heating system (2), a valley electricity storage system (3), a nitrogen heat exchange system (4), a constant temperature heat exchange system (5), and a nitrogen circulation system (6); the heat recovery system (1), the cascade stepped heating system (2), the nitrogen heat exchange system (4), the constant temperature heat exchange system (5), and the nitrogen circulation system (6) are connected in series, the nitrogen heat exchange system (4) and the cascade stepped heating system (2) are bidirectionally connected, and the nitrogen circulation system (6) has another branch connected to the nitrogen heat exchange system (4); the valley electricity storage system (3) is specifically a distributed structure, and is set in sequence on the heat recovery system (1), the cascade stepped heating system (2), the nitrogen heat exchange system (4), the constant temperature heat exchange system (5), and the nitrogen circulation system (6).

2. The energy-saving thermal system for tire vulcanization according to claim 1, characterized in that, The heat recovery system (1) includes a workshop air collection pipe (102), which is connected to a fan (107) and transmits the waste heat of the workshop through the main air inlet pipe (104) to the connected evaporator room (114). The evaporator room (114), compressor (111) and heat exchanger (110) are connected in series. The outlet of the heat exchanger (110) is connected to a hot water pipe (112) through a water pump (108). The hot water pipe (112) is connected to one end of the heat exchanger high temperature side of the primary hot water storage tank (103) through a solenoid valve, and the other end is connected to the inlet of the heat exchanger (110) through a solenoid valve.

3. The energy-saving thermal system for tire vulcanization according to claim 2, characterized in that, The evaporator room (114) consists of one or more units, and the connection relationship of each evaporator room is a series connection, a parallel connection, or a series-parallel connection. The evaporator room (114) is a shell made of thermal insulation material, and an air source heat pump device (101) is installed inside. A gradient air outlet pipe (106) is installed on the upper part of the shell and connected to the air outlet of the air source heat pump device (101). A gradient air inlet pipe (105) is installed on one side of the shell, and a fresh air inlet pipe valve (115) is installed on the other side.

4. The energy-saving thermal system for tire vulcanization according to claim 2, characterized in that, The cascaded stepped heating system (2) includes a high-temperature water source heat pump (201). The low-temperature side inlet pipe (203) of the high-temperature water source heat pump (201) is connected to one end of the low-temperature side of the primary hot water storage tank (103) through a solenoid valve, and the other end is connected to the low-temperature side return pipe (204) of the high-temperature water source heat pump (201) through a solenoid valve. The high-temperature side heat outlet pipe (206) of the high-temperature water source heat pump (201) is connected to the high-temperature side of the in-tank heat exchanger (205) of the secondary heat storage tank (202) through a solenoid valve and is connected to the high-temperature side of the high-temperature water source heat pump (201) through a heat return pipe (207) to form a loop.

5. The energy-saving thermal system for tire vulcanization according to claim 4, characterized in that, The primary heat storage tank (103) is equipped with flange-type primary heat storage tank off-peak electric heating rods (301) on both sides, and the secondary heat storage tank (202) is equipped with flange-type secondary heat storage tank off-peak electric heating rods (302) on both the upper and lower sides.

6. The energy-saving thermal system for tire vulcanization according to claim 4, characterized in that, The nitrogen heat exchange system (4) has a symmetrical structure consisting of a first heat exchange tank (401a) and a second heat exchange tank (401b), specifically including a medium passage and a nitrogen passage. The medium passage is specifically as follows: the low-temperature side outlet of the in-tank heat exchanger (205) of the secondary heat storage tank (202) is connected to the first heat exchange tank (401a) through a water pump and a solenoid valve, and the other path is connected to the second heat exchange tank (401b). The first heat exchange tank (401a) and the second heat exchange tank (401b) are provided with outlets that are connected to the low-temperature side inlet of the in-tank heat exchanger (205) of the secondary heat storage tank (202) through a solenoid valve to form a loop. The nitrogen gas passage is specifically as follows: the nitrogen gas input end of the first heat exchange tank (401a) is connected to the nitrogen storage tank (602) and the first nitrogen recovery tank (604a) respectively; the nitrogen gas input end of the second heat exchange tank (401b) is connected to the nitrogen storage tank (602) and the second nitrogen recovery tank (604b) respectively; and the nitrogen gas output ends of the first heat exchange tank (401a) and the second heat exchange tank (401b) are connected to the nitrogen gas input ends of the first constant temperature heat exchange tank (501a) and the second constant temperature heat exchange tank (501b) respectively.

7. The energy-saving thermal system for tire vulcanization according to claim 6, characterized in that, Both the first heat exchange tank (401a) and the second heat exchange tank (401b) are equipped with nitrogen heat exchanger electric heating rods (303) for heating the medium.

8. An energy-saving thermal system for tire vulcanization according to claim 6, characterized in that, The constant temperature heat exchange system (5) is specifically as follows: The first constant temperature heat exchange tank (501a) and the second constant temperature heat exchange tank (501b) have a symmetrical structure. Specifically, the heat medium input end of the constant temperature heat exchange tank is connected to the heat medium output end of the constant temperature heat exchange tank in sequence through a solenoid valve, a valley electricity storage tank and a water pump. The first constant temperature heat exchange tank (501a) and the second constant temperature heat exchange tank (501b) are respectively connected to the first valley electricity storage tank (305a) and the second valley electricity storage tank (305b). Valley electricity heating rods (304) of the constant temperature heat exchange system are provided on the upper and lower sides of the valley electricity storage tank. The nitrogen output ends of the first constant temperature heat exchange tank (501a) and the second constant temperature heat exchange tank (501b) are respectively connected to the first high pressure storage tank (603a) and the second high pressure storage tank (603b) through a high pressure pump (605).

9. An energy-saving thermal system for tire vulcanization according to claim 8, characterized in that, The nitrogen circulation system (6) is specifically as follows: The first high-pressure storage tank (603a) is connected to the nitrogen inlet pipe (606) of the central mechanism via a solenoid valve and is connected to the central mechanism for nitrogen supply. The nitrogen output end of the central mechanism is connected to the nitrogen discharge pipe (607) via a solenoid valve and is connected to the first nitrogen recovery tank (604a). One output end of the first nitrogen recovery tank (604a) is connected to the nitrogen storage tank (602) via a solenoid valve air circuit, and the other output end is connected to the nitrogen input end of the first heat exchange tank (401a) via a solenoid valve air circuit. The second high-pressure storage tank (603b) has upper and lower hot plate output ports, and nitrogen is supplied to the upper and lower hot plates through the upper and lower hot plate nitrogen inlet pipes (608). The nitrogen output ends of the upper and lower hot plates are connected to the second nitrogen recovery tank (604b) through gas lines. One output end of the second nitrogen recovery tank (604b) is connected to the nitrogen storage tank (602) through a solenoid valve gas line, and the other output end is connected to the nitrogen input end of the second heat exchange tank (401b) through a solenoid valve gas line.

10. An energy-saving thermal system for tire vulcanization according to claim 9, characterized in that, The nitrogen circulation system (6) is also equipped with a PSA nitrogen generator (601), which is connected to a nitrogen storage tank (602) for nitrogen replenishment.

Images