Energy-saving thermodynamic system for tire vulcanization

Abstract

The energy-saving thermodynamic system comprises a heat recovery system, a cascade stepped heating system, a valley electricity energy storage system, a nitrogen heat exchange system, a constant-temperature heat exchange system and a nitrogen circulation system. The heat recovery system, the cascade type stepped heating system, the nitrogen heat exchange system, the constant-temperature heat exchange system and the nitrogen circulation system are sequentially connected in series, the nitrogen heat exchange system and the cascade type stepped heating system are in two-way connection to realize medium circulation, and another branch of the nitrogen circulation system is connected with the nitrogen heat exchange system to realize nitrogen circulation; the valley electricity energy storage system is specifically of a distributed structure and is sequentially arranged on the heat recovery system, the cascade type stepped heating system, the nitrogen heat exchange system, the constant-temperature heat exchange system and the nitrogen circulation system for auxiliary heating. The problems of economic burden and workshop thermal pollution of coal-to-electricity implementation in the vulcanization process are solved, the working environment temperature is improved, meanwhile, the energy consumption cost and waste are reduced, and the production efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of tire production, and in particular relates to an energy-saving thermal system for tire vulcanization. Background Art

[0002] In tire manufacturing, the vulcanization process is one of the most energy-intensive core steps. The industry currently uses steam as the vulcanization medium. Production equipment continuously releases significant heat during operation, resulting in workshop temperatures consistently ranging from 35°C to 55°C, particularly in the summer when temperatures often exceed 50°C. Furthermore, in response to environmental protection policies, manufacturers are actively promoting "coal-to-electricity" energy substitution initiatives and are gradually adopting nitrogen as a replacement for traditional steam.

[0003] However, the existing technology system still faces significant challenges. First, the large amount of waste heat generated during the vulcanization process continuously dissipates into the workshop environment, causing the workshop temperature to remain in a high range of 35°C to 55°C year-round, and easily exceeding 50°C in 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 to the surrounding environment. Second, although the "coal-to-electricity" policy has significant environmental benefits, the direct cost of electricity is much higher than traditional coal combustion, resulting in a significant increase in energy consumption expenses for enterprises and weakening the market competitiveness of products.

[0004] Therefore, there is an urgent need for a thermal system that can solve the above problems. Summary of the Invention

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

[0006] The technical solution adopted by the present invention to solve the problems existing in the prior art is:

[0007] An energy-saving thermal system for tire vulcanization includes a heat recovery system, a cascaded stepped heating system, a valley power 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.

[0008] The valley power energy storage system is specifically a distributed structure, which is sequentially arranged on the heat recovery system, the cascade step heating system, the nitrogen heat exchange system, the constant temperature heat exchange system and the nitrogen circulation system for auxiliary heating.

[0009] Preferably, the heat recovery system includes a workshop air collection duct. This duct is connected to a fan, which transfers waste heat from the workshop through a main air inlet duct to the connected evaporator room. The evaporator room, compressor, and heat exchanger are connected in series. The heat exchanger's outlet is connected to a hot water pipe via a water pump. This hot water pipe is connected to one end of the heat exchanger's high-temperature side of the primary hot water storage tank via a solenoid valve. The other end is connected to the heat exchanger's water inlet via a solenoid valve.

[0010] The evaporator room is specifically composed of one or more components, and the connection relationship of each evaporator room is specifically a series connection, a parallel connection or a series-parallel connection.

[0011] The evaporator room is a housing made of insulating material, housing an air-source heat pump unit. A gradient outlet duct is installed on the upper portion of the housing and connected to the air outlet of the air-source heat pump unit. A gradient inlet duct is installed on one side of the housing. The other side is equipped with a valve for the fresh air inlet duct of the machine room.

[0012] Preferably, the cascade step heating system includes a high-temperature water source heat pump. The low-temperature side water inlet pipe of the high-temperature water source heat pump is connected to one end of the low-temperature side of the primary hot water 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 heat outlet pipe of the high-temperature water source heat pump is connected to the high-temperature side of the internal heat exchanger of the secondary heat storage tank via a solenoid valve and then to the high-temperature side of the high-temperature water source heat pump via a heat return pipe, forming a loop.

[0013] Wherein, flange-type first-stage heat storage tank valley electric heating rods are provided on both sides of the first-stage heat storage tank. Flange-type second-stage heat storage tank valley electric heating rods are provided on both the upper and lower sides of the second-stage heat storage tank.

[0014] Preferably, the nitrogen heat exchange system is specifically configured such that the first heat exchange tank and the second heat exchange tank are symmetrical structures, and specifically include a medium passage and a nitrogen passage.

[0015] The medium passage is specifically as follows: the low-temperature side outflow end of the internal heat exchanger of 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 end is connected to the second heat exchange tank, and the first heat exchange tank body and the second heat exchange tank are provided with outflow ends connected to the low-temperature side inflow end of the internal heat exchanger of the secondary heat storage tank through a solenoid valve to form a loop.

[0016] The nitrogen pathway is specifically configured as follows: the nitrogen input end of the first heat exchange tank is connected to the nitrogen storage tank and the first nitrogen recovery tank. The nitrogen input end of the second heat exchange tank is connected to the nitrogen storage tank and the second nitrogen recovery tank. The nitrogen output ends of the first heat exchange tank and the second heat exchange tank are connected to the nitrogen input ends of the first constant temperature heat exchange tank and the second constant temperature heat exchange tank, respectively.

[0017] Among them, the first heat exchange tank body and the second heat exchange tank are both provided with nitrogen heat exchanger valley electric heating rods for heating the medium.

[0018] Preferably, the constant temperature heat exchange system is specifically:

[0019] The first and second constant temperature heat exchange tanks are symmetrically constructed. Specifically, the heat medium input of the constant temperature heat exchange tanks is connected to the heat medium output of the constant temperature heat exchange tanks via a solenoid valve, a valley power energy storage tank, and a water pump. The first and second constant temperature heat exchange tanks are connected to the first and second valley power energy storage tanks, respectively. Valley power heating rods are installed on the upper and lower sides of the valley power energy storage tanks.

[0020] The nitrogen output ends of the first constant temperature heat exchange tank body and the second constant temperature heat exchange tank body are connected to the first high-pressure storage tank and the second high-pressure storage tank respectively through high-pressure pumps.

[0021] Preferably, the nitrogen circulation system is specifically:

[0022] The first high-pressure storage tank is connected to the central mechanism nitrogen inlet pipe 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 exhaust pipe via a solenoid valve and is connected to the first nitrogen recovery tank. One output end of the first nitrogen recovery tank is connected to the nitrogen storage tank via a solenoid valve gas circuit. Another output end of the first nitrogen recovery tank is connected to the nitrogen input end of the first heat exchange tank body via a solenoid valve gas circuit.

[0023] The second high-pressure storage tank has output ports for the upper and lower hot plates, which are connected to the upper and lower hot plates via nitrogen inlet pipes. The nitrogen output ports of both the upper and lower hot plates are connected to a second nitrogen recovery tank. One output port of the second nitrogen recovery tank is connected to the nitrogen storage tank via a solenoid valve. Another output port is connected to the nitrogen input port of the second heat exchange tank via a solenoid valve.

[0024] The nitrogen circulation system is further provided with a PSA nitrogen generator, the gas circuit of which is connected to a nitrogen storage tank for nitrogen replenishment.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The present invention uses multiple groups of air source heat pumps configured in series to efficiently recover the medium and high temperature waste heat air continuously dissipated from the vulcanization workshop, utilizes the air inlet working conditions under specific temperature conditions to maintain the heating energy efficiency in a higher range, and stores the prepared hot water in a primary heat storage device, which significantly alleviates the thermal pollution in the workshop and optimizes the working environment; combined with the valley electricity heating device to store energy during the period of low electricity prices, and the two-stage cascade heat pump to achieve a jump in the medium temperature, an energy-saving mechanism that coordinates waste heat recovery and valley electricity utilization is formed, which greatly reduces the energy consumption base of traditional heating methods.

[0027] The nitrogen circulation system achieves closed-loop operation by maintaining a preset pressure range through a high-pressure power unit. The heated nitrogen is directly returned to the system for recycling through a recovery device, completely avoiding the problem of heat energy loss in the steam medium. At the same time, the air volume control component optimizes the inlet air temperature, and the modularly designed valley power energy storage unit adapts to production line needs on demand, simultaneously reducing equipment transformation investment and long-term operation and maintenance costs, effectively balancing the electricity cost pressure of the "coal to electricity" energy transformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will be further described below with reference to the accompanying drawings and examples.

[0029] Figure 1 This is a schematic diagram of the structure of an energy-saving thermal system for tire vulcanization according to the present invention.

[0030] Figure 2 This is a structural diagram of an evaporator room in an energy-saving thermal system for tire vulcanization according to the present invention.

[0031] Figure 3 This is a schematic structural diagram of a nitrogen heat exchange system and a constant temperature heat exchange system in an energy-saving thermal system for tire vulcanization according to the present invention.

[0032] Figure 4 The present invention provides an air source heat pump operating performance table for an energy-saving thermal system for tire vulcanization.

[0033] In the figure: 101 air source heat pump device, 102 workshop air collecting pipe, 103 first-level hot water storage tank, 104 main air inlet pipe, 105 gradient air inlet pipe, 106 gradient air outlet pipe, 107 fan, 108 water pump, 109 evaporator, 110 heat exchanger, 111 compressor, 112 hot water pipe, 113 return pipe, 114 evaporator machine room, 115 machine room fresh air inlet pipe valve;

[0034] 201 high-temperature water source heat pump, 202 secondary heat storage tank, 203 water inlet pipe, 204 return pipe, 205 tank internal heat exchanger, 206 heat outlet pipe, 207 heat return pipe;

[0035] 301 first-level heat storage tank valley electric heating rod, 302 second-level heat storage tank valley electric heating rod, 303 nitrogen heat exchanger valley electric heating rod, 304 constant temperature heat exchange system valley electric heating rod, 305a first valley electric energy storage tank, 305b second valley electric energy storage tank, 306 circulation pump, 307 heat transfer oil;

[0036] 401a first heat exchange tank, 401b second heat exchange tank, 402 nitrogen heating heat exchanger;

[0037] 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;

[0038] 601PSA nitrogen production equipment, 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 central mechanism nitrogen inlet pipe, 607 nitrogen pipe, 608 upper and lower hot plate nitrogen inlet pipe, 609 nitrogen return pipe. DETAILED DESCRIPTION

[0039] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of the components as the criteria for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve the technical problem within a certain error range and basically achieve the technical effect.

[0040] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "horizontal", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are merely for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed or operate in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0041] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0042] The following is combined with Figures 1 to 3 An energy-saving thermal system for tire vulcanization of the present invention is described in further detail, but this is not intended to limit the present invention.

[0043] An energy-saving thermal system for tire vulcanization includes a heat recovery system 1, a cascade stepped heating system 2, a valley power energy 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 in sequence. The nitrogen heat exchange system 4 and the cascade stepped heating system 2 are bidirectionally connected to realize medium circulation. The nitrogen circulation system 6 has another branch connected to the nitrogen heat exchange system 4 to realize nitrogen circulation. The valley power energy storage system 3 is specifically a distributed structure and is sequentially arranged 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 for auxiliary heating.

[0044] The heat recovery system 1 includes a workshop air collecting pipe 102, which is connected to a fan 107 and transmits the workshop waste heat through the main air inlet pipe 104 to the connected evaporator room 114 through the fan 107. The evaporator room 114, the compressor 111 and the heat exchanger 110 are connected in series in sequence. The water outlet of the heat exchanger 110 is connected to the hot water pipe 112 through the water pump 108. The hot water pipe 112 is connected to one end of the high-temperature side of the heat exchanger of the first-level hot water storage tank 103 through a solenoid valve, and the other end is connected to the water inlet of the heat exchanger 110 through a solenoid valve and a return pipe 113.

[0045] The heat recovery system 1 specifically functions to recover heat from the workshop's heating equipment through an air-source heat pump device, performing primary heating and converting the vulcanization workshop's waste heat into hot water stored in a primary hot water storage tank 103. The workshop's air collection duct 102, driven by a fan 107, transports hot air from the workshop's ceiling to the primary evaporator room 114. After passing through the evaporator 109, it passes through the gradient outlet duct 106 and enters the secondary evaporator room. After evaporation, it passes through the gradient outlet duct 106 and enters the tertiary evaporator room, and so on, until the temperature drops to approximately 25°C. The heat medium output by the air-source heat pump device enters the heat exchanger 110 through a compressor 111, where it exchanges heat with water. The heat is then pumped to the hot water storage tank 103 via a water pump 108.

[0046] The evaporator rooms 114 are specifically composed of one or more evaporator rooms, each of which is connected in series, parallel, or series-parallel. The specific connection method depends on whether the exhaust gas temperature of the last evaporator room is approximately 25°C. The purpose of connecting the evaporator rooms is to ensure that the air source heat pump operates at a high cost-of-performance ratio (COP) and reduce the significant impact of ambient temperature on the heat pump's COP. 25°C is the optimal operating condition for the heat COP of the air source heat pump.

[0047] The present invention provides this embodiment. When the ambient temperature of the workshop air collecting pipe output is 55°C in summer, seven evaporators are connected in series for step absorption, and the temperature difference between the evaporator inlet and outlet is about 5°C. The output temperatures can be roughly 55°C, 50°C, 45°C, 40°C, 35°C, 30°C, and 25°C, and can reach a minimum of 25°C, thereby achieving the optimal operating conditions for the thermal energy efficiency of the air source heat pump.

[0048] The evaporator room 114 is specifically a shell made of insulation material, with an air source heat pump device 101 installed inside. A gradient air outlet pipe 106 is provided on the upper part of the shell and is connected to the air outlet of the air source heat pump device 101. A gradient air inlet pipe 105 is provided on one side of the shell, and a machine room fresh air inlet pipe valve 115 is installed on the other side.

[0049] The shell of the evaporator room 114 is constructed of lightweight steel structure insulation composite panels. In this embodiment, the evaporator has a specific dimension of 5000 mm (length × height × width) and 4000 mm (height × width). The evaporator room 114 has a specific dimension of 5000 mm (length × height × width) by 3800 mm (height × width). The vertical columns of the evaporator room 114 are constructed of hot-dip galvanized 80 mm (height × height × width) rectangular steel pipes. The horizontal braces and vertical columns of the evaporator room 114 are constructed of the same material, 40 mm (height × height × width) rectangular steel pipes. The evaporator room 114 enclosure is constructed of 80 mm thick PU foam color-coated steel composite panels.

[0050] The heat recovery air inlet on one side of the evaporator room 114 has a specific size of 1200×600 (mm), and the fresh air inlet valve 115 on the other side, or the fresh air electric damper, has a specific size of 800×800 (mm), and a dust filter is installed on the fresh air inlet.

[0051] 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 shut off the entry of fresh air. When the fresh air temperature is higher than the heat recovery inlet air, the fresh air inlet valve 115 is fully opened to draw in a large amount of ambient fresh air.

[0052] like Figure 4As shown, due to the seasonal temperature difference and the day-night temperature difference of the environment, the energy efficiency ratio output of the air source heat pump is unstable. However, through the design of the connection relationship between the evaporator room 114 and the evaporator, the energy efficiency ratio output can be effectively controlled.

[0053] The primary hot water storage tank 103 is a large-capacity tank, either a metal insulated aboveground tank or an underground hot water storage tank. Depending on the energy requirements of a large tire factory, the tank material selected may include, but is not limited to, metal, carbon steel, SUS304 stainless steel, or FRP. The primary tank or multiple smaller tanks are connected. The capacity of the primary hot water storage tank 103 also needs to consider heat demand. In addition to heat generated by heat recovery, the presence of extreme low temperatures in the area of ​​use must be considered, and the heat generated by off-peak electricity must be sufficient for full-time use.

[0054] In this embodiment, underground heat storage is adopted, which can reduce the ground space while achieving good underground thermal insulation.

[0055] In this embodiment, the first-level hot water storage tank 103 is specifically provided with a heat exchanger therein, and the heat exchanger 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 first-level hot water storage tank 103 by a water pump 108, and heat exchange is performed through the heat medium in the hot water storage tank to increase the temperature of the heat medium in the low-temperature side.

[0056] The present invention also provides a second embodiment, which differs from the first embodiment in the structure of the first-stage hot water storage tank 103. The first-stage hot water storage tank 103 of this second embodiment is provided with a water inlet and a water outlet, and is internally provided with a low-temperature heat exchanger. Specifically, the first-stage hot water storage tank 103 operates by pumping hot water from the heat exchanger 110 to the first-stage hot water storage tank 103 via a water pump 108. The water is then directly injected into the first-stage hot water storage tank 103 through the water inlet, exchanged with the low-temperature heat exchanger, and then returned to the heat exchanger 110 through the water outlet.

[0057] Both sides of the first-level hot water storage tank 103 are provided with flange-type first-level heat storage tank valley electric heating rods 301. The specific working mode of the valley electric heating rod 301 is to heat during the valley electricity period. Since the unit electricity price during the valley electricity period is about one-third of the peak and valley unit electricity price, the power saving effect is achieved. The valley electric heating rod 301 is mainly used in low-temperature situations. When the temperature is low, after closing the fresh air inlet pipe valve 115, when the heat absorbed by the evaporator is insufficient, the valley electric heating rod 301 increases the heating power storage energy to compensate for the heat. The valley electric heating rod 301 is specifically a single high-power valley electric heating rod or multiple low-power valley electric heating rods. In this embodiment, multiple low-power valley electric heating rods are used for multi-point distributed heating. Each power range is 10kw-300kw, and the total power is between 1000kw-10000kw.

[0058] The cascade step heating system 2 includes a high-temperature water source heat pump 201. Its low-temperature side water inlet pipe 203 is connected to one end of the low-temperature side of the primary hot water storage tank 103 via a solenoid valve. 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 internal heat exchanger 205 of the secondary heat storage tank 202 via a solenoid valve and then to the high-temperature side of the high-temperature water source heat pump 201 via a heat return pipe 207, forming a loop. Flange-type secondary heat storage tank valley electric heater rods 302 are installed on both the upper and lower sides of the secondary heat storage tank 202.

[0059] The cascade step-heating heat pump system is a two-stage heating system according to the present invention. Based on the hot water temperature of 60-70°C in the heat recovery system's primary heating system, the high-temperature water source heat pump 201 raises the temperature of the medium in the secondary heat storage tank 202 to 130-170°C. In addition to the water source heat pump, a secondary heat storage tank valley electric heater 302 on the secondary heat storage tank 202 activates during off-peak hours to provide heating. The specific selection and operating method of the secondary heat storage tank valley electric heater 302 are the same as those of the primary heat storage tank valley electric heater 301.

[0060] The difference between the secondary heat storage tank 202 and the primary hot water storage tank 103 in this embodiment is that the medium temperature in the secondary heat storage tank 202 is approximately 130-170°C and the pressure is approximately 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 in the secondary heat storage tank via the internal heat exchanger 205 installed in the secondary heat storage tank 202.

[0061] The specific number of the high-temperature water source heat pumps 201 is related to the required temperature and the temperature of the medium in the secondary heat storage tank 202. In this embodiment, one high-temperature water source heat pump 201 is specifically selected.

[0062] The nitrogen heat exchange system 4 is a three-stage heating system that primarily exchanges heat between a heat medium and nitrogen, namely, heating the nitrogen through a nitrogen heating heat exchanger 402. Specifically, the nitrogen heat exchange system 4 comprises a first heat exchange tank 401a and a second heat exchange tank 401b symmetrically configured to include a medium passage and a nitrogen passage.

[0063] The medium passage is specifically as follows: the low-temperature side outflow end of the internal heat exchanger 205 of the secondary heat storage tank 202 is connected to the first heat exchange tank body 401a through a water pump and a solenoid valve, and the other end is connected to the second heat exchange tank 401b, and the first heat exchange tank body 401a and the second heat exchange tank 401b are provided with outflow ends connected to the low-temperature side inflow end of the internal heat exchanger 205 of the secondary heat storage tank 202 through a solenoid valve to form a loop, forming a heat medium circulation, and transferring the heat of the secondary heating heat storage tank to the heat medium in the tertiary heat exchange tank body.

[0064] The nitrogen passage is specifically as follows: the nitrogen input end of the first heat exchange tank body 401a is connected to the nitrogen storage tank 602 and the first nitrogen recovery tank 604a respectively; the nitrogen 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; the nitrogen output ends of the first heat exchange tank body 401a and the second heat exchange tank 401b are connected to the nitrogen input ends of the first constant temperature heat exchange tank body 501a and the second constant temperature heat exchange tank body 501b respectively.

[0065] Since the temperature requirement of the central mechanism of the tire vulcanizer is higher than the temperature requirement of the upper and lower heating plates, the heat exchange tank body is divided into a first heat exchange tank body 401a and a second heat exchange tank 401b. The first heat exchange tank body 401a and the second heat exchange tank 401b are both provided with a nitrogen heat exchanger valley electric heating rod 303, which is used to heat the medium to achieve more precise temperature control. The specific selection of the heat exchange tank body is related to the heat medium. When pure water is selected as the heat medium, the heat exchange tank body is specifically a pressure vessel and the pressure bearing performance is above 12kg / cm2; when heat transfer oil is selected as the heat medium, the heat exchange tank body is specifically a normal pressure container. The material of the heat exchange tank body includes but is not limited to carbon steel anti-corrosion or SUS304 stainless steel.

[0066] The nitrogen heating heat exchanger 402 can be a coil type, a finned tube with internal and external threads, or a tube-in-tube type. When the nitrogen heating heat exchanger 402 is installed horizontally, ensure that the heat medium inlet and the nitrogen inlet are in opposite directions. The nitrogen heating heat exchanger 402 is installed at the nitrogen heat exchanger inlet. One or more heat exchange tanks can be installed, with the specific number depending on the temperature.

[0067] After primary heat exchange through the nitrogen heat exchange system 4, the nitrogen enters the constant temperature heat exchange system 5 for secondary heat exchange. The constant temperature heat exchange system 5 heats and adjusts the temperature to the required constant temperature through the temperature regulating electric heating rod 504, the constant temperature heat exchange system valley electric heating rod 304, and the first valley electric energy storage tank 305a and the second valley electric energy storage tank 305b connected to the constant temperature heat exchange system valley electric heating rod 304, and outputs the temperature to the high-pressure pump 605.

[0068] The constant temperature heat exchange system 5 specifically comprises: the first constant temperature heat exchange tank 501a and the second constant temperature heat exchange tank 501b having 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 via a solenoid valve, a valley power energy 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 power energy storage tank 305a and the second valley power energy storage tank 305b. The valley power energy storage tank contains heat transfer oil 307, and the valley power heating rods 304 of the constant temperature heat exchange system are provided on the upper and lower sides of the valley power energy storage tank. The heat medium is recycled by a circulation pump 306, storing heat during the valley power period and then dissipating it. 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 via a high-pressure pump 605. The first constant temperature heat exchange tank 501a and the second constant temperature heat exchange tank 501b are both provided with a nitrogen secondary heat exchanger 502 and realize heat exchange between the heat medium and nitrogen through the heat medium 503 in the tank.

[0069] The specific power selection for the temperature-regulating electric heating rod 504 and the constant temperature heat exchange system valley electric heating rod 304 is related to the desired constant temperature. The heat medium used in the first constant temperature heat exchange tank 501a, the second constant temperature heat exchange tank 501b, the first valley electric energy storage tank 305a, and the second valley electric energy storage tank 305b is thermal oil. Specifically, the thermal oil is selected from a closed system such as L-Q13300 or L-QD300.

[0070] In this embodiment, the heat medium circulates between the heat medium within the constant-temperature heat exchange tank and the heat medium in the valley power energy storage tank. Valley power is used to heat the heat medium in the valley power energy storage tank to a temperature slightly higher than the constant-temperature output nitrogen gas temperature, ranging from 8-10°C, and then heat circulates with the constant-temperature tank. The unit power of the valley power heating rod 304 in the constant-temperature heat exchange system is specifically 10-200 kW, with a total power range of specifically 1000-10,000 kW.

[0071] The present invention also provides a third embodiment, which is different from the first embodiment in that the heat medium is a closed heating type heat transfer oil, so the constant temperature heat exchange system 5 is a normal pressure heating system, that is, an electric heating rod is directly installed on the constant temperature heat exchange tank to heat the heat medium and fine-tune it to ensure that the output nitrogen temperature meets the temperature requirements of use. The heat transfer oil is specifically a closed model such as L-QD250, L-QC300 or L-QB250.

[0072] The nitrogen circulation system 6 is specifically as follows: the first high-pressure storage tank 603a is connected to the central mechanism nitrogen inlet pipe 606 through 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 exhaust pipe 607 through a solenoid valve and is connected to the first nitrogen recovery tank 604a; the output end of the first nitrogen recovery tank 604a is connected to the nitrogen storage tank 602 through a solenoid valve gas circuit on one side, and is connected to the nitrogen input end of the first heat exchange tank body 401a through a solenoid valve gas circuit on the other side; the second high-pressure storage tank 603b is divided into upper and lower hot plate output ports, and is respectively connected to the upper and lower hot plates through upper and lower hot plate nitrogen inlet pipes 608 for nitrogen supply; the nitrogen output ends of the upper and lower hot plates are both connected to the second nitrogen recovery tank 604b through a nitrogen return pipe 609; the output end of the second nitrogen recovery tank 604b is connected to the nitrogen storage tank 602 through a solenoid valve gas circuit on one side, and is connected to the nitrogen input end of the second heat exchange tank body 401b through a solenoid valve gas circuit on the other side.

[0073] The nitrogen circulation system 6 is further provided with a PSA nitrogen production device 601 , and the gas circuit of the PSA nitrogen production device 601 is connected to a nitrogen storage tank 602 for nitrogen replenishment.

[0074] The nitrogen that has passed through the constant temperature heat exchange system 5 is pumped into the high-pressure storage tank through the high-pressure pump 605. The high-pressure storage tank is then transported to the central mechanism and upper and lower heating plates of the tire vulcanizer through the solenoid valves on the pipes. The nitrogen that has been heated enters the nitrogen recovery tank through the solenoid valves on the pipes.

[0075] The nitrogen circulation system 6 is also equipped with a PSA nitrogen generator 601. The 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 transported to the high-pressure storage tank via a high-pressure pump 605. The nitrogen is then transported to the central mechanism and upper and lower heating plates of the tire vulcanizer through the solenoid valves on the pipes. The heated nitrogen enters the nitrogen recovery tank through the solenoid valves on the pipes, completing the heating and heat dissipation cycle and entering the next heating cycle. The 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.

[0076] The specific operating principle of this invention is to utilize the waste heat generated by the tire shop's heating equipment and dissipate it into the workshop. This heat is recovered by the air-source heat pump device 101 of the heat recovery system 1, converting it into heat medium to complete the primary heating process. The heat medium is stored in the primary hot water storage tank 103. Simultaneously, during off-peak hours, the off-peak heating rod 301 in the primary hot water storage tank is activated to heat the heat medium. The temperature of the heat medium in the primary heating process is between 60-70°C.

[0077] The cascade stepped heating system 2 performs secondary heating on the basis of primary heating, adopts a cascade high-temperature water source heat pump 201, and cooperates with the secondary heat storage tank valley electric heating rod 302 to heat the medium to between 130-170°C and store it in the secondary heat storage tank 202 to complete the secondary heating.

[0078] The heat from the medium is transferred to the nitrogen through the nitrogen heat exchange system 4, which then enters the constant temperature heat exchange system 5. The nitrogen is then precisely controlled by the valley electricity storage tank and the thermostatic electric heater to heat it to the required temperature. High-pressure pump 605 then heats the nitrogen by feeding it into the tire curing press's central mechanism and upper and lower heating plates. After heating, the nitrogen is transferred to the nitrogen recovery tank, completing a heating cycle.

[0079] The present invention has a total of three levels of heating. The first level of heating is a heat recovery system 1, the second level of heating is a cascade step heating system 2, the third level of heating is a nitrogen heat exchange system 4, and the fourth level of heating is a constant temperature heat exchange system 5. The energy efficiency of the first and second levels of heating accounts for about 95-90%, and the third and fourth levels of fine-tuning heating account for about 5-10%.

[0080] The present invention solves the environmental problem of waste heat in tire workshops, improves the working environment temperature of workers and is beneficial to their health, and also has significant economic benefits of energy saving and cost saving. It is a good technical solution for coal-to-electricity conversion.

[0081] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. An energy-saving thermal system for tire vulcanization, characterized in that: The invention comprises a heat recovery system (1), a cascade step heating system (2), a valley power energy 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 step heating system (2), the nitrogen heat exchange system (4), the constant temperature heat exchange system (5) and the nitrogen circulation system (6) are sequentially connected in series, the nitrogen heat exchange system (4) and the cascade step 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 power energy storage system (3) is specifically a distributed structure, and is sequentially arranged on the heat recovery system (1), the cascade step 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 collecting pipe (102), which is connected to a fan (107) and transmits the workshop waste heat through the main air inlet pipe (104) to the connected evaporator room (114) through the fan (107). The evaporator room (114), the compressor (111) and the heat exchanger (110) are connected in series in sequence. The water 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 high-temperature side of the heat exchanger of the first-level hot water storage tank (103) through a solenoid valve, and the other end is connected to the water 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 machine room (114) is composed of one or more evaporator machine rooms, and the connection relationship of each evaporator machine 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, with an air source heat pump device (101) arranged inside. A gradient air outlet pipe (106) is arranged on the upper part of the shell and is connected to the air outlet of the air source heat pump device (101). A gradient air inlet pipe (105) is arranged on one side of the shell, and a machine room 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 cascade step heating system (2) includes a high-temperature water source heat pump (201), wherein a low-temperature side water inlet pipe (203) of the high-temperature water source heat pump (201) is connected to one end of the low-temperature side of the first-stage hot water storage tank (103) through a solenoid valve, and the other end is connected to a low-temperature side return pipe (204) of the high-temperature water source heat pump (201) through a solenoid valve, and a 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 tank internal heat exchanger (205) of the second-stage 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: Both sides of the first-level hot water storage tank (103) are provided with flange-type first-level heat storage tank valley electric heating rods (301), and both upper and lower sides of the second-level heat storage tank (202) are provided with flange-type second-level heat storage tank valley electric heating rods (302).

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

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

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

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

10. The energy-saving thermal system for tire vulcanization according to claim 9, characterized in that: The nitrogen circulation system (6) is further provided with a PSA nitrogen production device (601), and the gas circuit of the PSA nitrogen production device (601) is connected to a nitrogen storage tank (602) for nitrogen replenishment.

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