Energy-saving aluminum alloy air quenching rapid cooling system

Abstract

An energy-saving aluminum alloy air quenching rapid cooling system belongs to the technical field of aluminum alloy heat treatment, and comprises a flue gas waste heat recovery module for collecting waste flue gas, the flue gas waste heat recovery module provides heat for a refrigeration module 6, and the refrigeration module 6 provides cold for an air quenching module to realize air quenching of workpieces. The flue gas waste heat recovery module comprises a heat exchanger 8 connected with a waste flue gas collection pipeline, and waste flue gas provides heat for the refrigeration module 6 in the heat exchanger 8. The waste heat of the waste smoke generated in the industrial production process is fully utilized to drive the refrigerating system, dependence on traditional energy is greatly reduced, direct emission of high-temperature smoke is reduced through effective recovery and energy utilization of the waste smoke, pollution load to the environment is reduced, and clean production is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to aluminum alloy heat treatment technical field, especially to an energy -conserving type aluminum alloy air quenching rapid cooling system. BACKGROUND

[0002] Aluminum alloy as important structural material, its heat treatment process directly influences material mechanics performance. Quenching as the key heat treatment procedure, realizes supersaturation state through rapid cooling solid solution, and then promotes alloy strength and hardness. Traditional process mainly adopts water quenching technology, but there is obvious defect: cooling rate is too high, causes the intense temperature difference of workpiece surface and core, forms residual stress, and then causes workpiece deformation even cracking, influences product quality and yield.

[0003] To solve the water quenching defect, air quenching technology is gradually adopted. Air quenching as a kind of relatively gentle quenching mode, although can reduce workpiece deformation and cracking problem to some extent, but the existing air quenching system has slow cooling speed, large energy consumption and other problems. Traditional air quenching system often needs to consume a large amount of electric energy to drive fan and other equipment to produce high-speed airflow to cool, and the cooling efficiency is not high, leading to long quenching time, low production efficiency, and increasing production cost.

[0004] In addition, a large amount of waste flue gas will be produced in the industrial production process, and the direct discharge of these waste flue gas not only wastes a large amount of heat energy, but also causes serious pollution to the environment. Therefore, how to effectively utilize the heat energy in the waste flue gas and convert it into refrigeration energy for application in the aluminum alloy air quenching rapid cooling system has become a problem to be solved in the field. UTILITY MODEL CONTENT

[0005] In order to overcome the above technical defects, the utility model provides an energy -conserving type aluminum alloy air quenching rapid cooling system to solve at least one technical problem existing in the above background technology.

[0006] The utility model provides the following technical scheme: an energy -conserving type aluminum alloy air quenching rapid cooling system, including the flue gas waste heat recovery module of collection waste flue gas, the flue gas waste heat recovery module provides heat to refrigeration module 6, refrigeration module 6 provides cold to air quenching module, to realize the air quenching of workpiece;

[0007] The flue gas waste heat recovery module includes the heat exchanger 8 connected with waste flue gas collection pipeline, and the waste flue gas provides heat to refrigeration module 6 in the heat exchanger 8;

[0008] The refrigeration module 6 comprises a generator which absorbs heat from the heat exchanger 8, the refrigerant absorbs heat and evaporates to produce high-pressure refrigerant vapor in the generator, the high-pressure refrigerant vapor successively flows through the condenser and the evaporator to cool the refrigerant and change into low-pressure refrigerant vapor, and the refrigerant provides cold energy to the air quenching module;

[0009] The air quenching module comprises an air cooler 4 which absorbs cold energy from the refrigerant, and the air absorbs cold energy in the air cooler 4 to change into cold air, which is blown into the quenching chamber 1 under the driving of the air circulation fan 3 to air quench the workpiece.

[0010] Further, the refrigeration module 6 further comprises an absorber which mixes the refrigerant flowing out of the heat exchanger with the low-pressure refrigerant vapor, and the mixed refrigerant is pumped to the solution heat exchanger by the solution pump for heat exchange and then flows to the generator, and the refrigerant flowing out of the generator is subjected to heat exchange by the heat exchanger and then flows to the absorber.

[0011] Further, the heat exchanger 8 is further provided with a waste flue gas passage, and the generator is further provided with a refrigerant passage, and the heat exchanger 8 is a plate heat exchanger or a fin heat exchanger, which is used to increase the heat exchange area between the waste flue gas passage and the refrigerant passage.

[0012] Further, the heat exchanger 8 is connected to a flue gas pipeline 9, and an exhaust fan 7 is arranged on the flue gas pipeline 9, and the exhaust fan 7 provides pressure for the waste flue gas to make up for the pressure loss in the flow process of the waste flue gas.

[0013] Further, the air cooler 4 is a plate air cooler or a fin air cooler.

[0014] Further, the cold air delivery pipeline 2 comprises a supply air pipeline and a return air pipeline, and the heated air in the quenching chamber 1 flows back to the air cooler 4 through the return air pipeline to form air circulation.

[0015] Further, a control system comprising a return air temperature sensor is arranged, the return air temperature sensor is arranged inside the quenching chamber 1 and / or the return air pipeline and transmits the monitored temperature signal to a controller, the controller controls the exhaust fan 7, the air circulation fan 3 and the refrigeration module control system respectively, and the refrigeration module control system is used to control the solution pump of the refrigeration module to realize the adjustment of the flow of the waste flue gas and the refrigerant.

[0016] Further, the quenching chamber 1 and the air circulation fan 3 are arranged in a soundproof room 5, and the soundproof room 5 is used to block noise, and the soundproof room 5 is provided with an exhaust fan 10 which is used to balance the temperature inside and outside the soundproof room 5.

[0017] Further, the inner wall of the quenching chamber 1 is provided with a heat preservation layer.

[0018] Further, a safety valve is arranged on the generator.

[0019] The technical effects and advantages of the present application are as follows:

[0020] 1. Energy saving effect is prominent: the waste flue gas waste heat generated in the industrial production process is fully utilized to drive the refrigeration system, which greatly reduces the dependence on traditional energy, significantly reduces the power consumption of the original system fan and the overall operation cost, and the control system adjusts the rotating speed and power of the exhaust fan and the air circulation fan according to the equipment operation condition, thereby reducing the energy consumption.

[0021] 2. Environmental benefits are significant: through effective recovery and energy utilization of waste flue gas, direct emission of high-temperature flue gas is reduced, environmental pollution load is reduced, and clean production is realized.

[0022] 3. Precise control of quenching quality: based on the closed-loop control system, the flue gas flow, lithium bromide refrigerant output and fan frequency parameters are dynamically adjusted through real-time acquisition of return air temperature feedback signals, the chilled water temperature is accurately controlled and the heat exchange efficiency of the air cooling coil is optimized, thereby realizing stable regulation and control of the quenching air temperature, improving the cooling speed of air cooling quenching, and ultimately improving the uniformity of the aluminum alloy workpiece, the mechanical properties and the finished product qualification rate. BRIEF DESCRIPTION OF DRAWINGS

[0023] Fig. 1 It is a refrigeration module refrigeration cycle principle diagram of the present application.

[0024] Fig. 2 It is a schematic diagram of the overall structure of the present application.

[0025] Among them, 1, quenching chamber; 2, cold air conveying pipeline; 3, air circulation fan; 4, air cooler; 5, soundproof room; 6, refrigeration module; 7, exhaust fan; 8, heat exchanger; 9, flue gas pipeline; 10, exhaust fan; 11, wall; 12, heat treatment equipment. DETAILED DESCRIPTION

[0026] The technical scheme of the present application will be described clearly and completely in combination with the drawings in the present application, and the forms of each structure described in the following embodiments are only examples, and the present application is not limited to each structure described in the following embodiments. All other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0027] Refer to Figs. 1-2As shown, the utility model provides an energy -conserving type aluminium alloy air quenching rapid cooling system, including flue gas waste heat recovery module, flue gas waste heat recovery module sends waste flue gas to refrigeration module 6 as driving heat source, air quenching module is cooled to workpiece through heat exchange with refrigeration module 6.

[0028] Flue gas waste heat recovery module includes the heat exchanger 8 connected with waste flue gas collection pipeline, and the waste flue gas with temperature 535 ℃-550 ℃ is collected through waste flue gas collection pipeline, enters heat exchanger 8 and carries out preliminary heat exchange with refrigerant. Still be provided with filter on waste flue gas collection pipeline, and the filter filters waste flue gas, prevents damage, corrosion and blockage pipeline and component. Waste flue gas collection pipeline is also connected with heat treatment equipment 12, and the waste flue gas generated by heat treatment equipment 12 flows to heat exchanger 8 through waste flue gas collection pipeline. Heat exchanger 8 is connected with chimney through flue gas pipeline 9, and is provided with flue gas fan 7 on flue gas pipeline 9, and flue gas fan 7 is used to overcome the resistance loss of waste flue gas flowing through heat exchanger, flue gas pipeline 9 and chimney, and flue gas pipeline 9 is also provided with flue gas filter, and flue gas filter is used to filter the harmful substances of flue gas discharged into the surrounding environment. Heat exchanger 8 is plate heat exchanger or fin heat exchanger.

[0029] Refrigeration module 6 adopts absorption refrigeration cycle, and the heat energy of waste flue gas is driving heat source. Waste flue gas flows into the heat exchanger 8 of refrigeration module 6, and heats the dilute solution in the generator to make it produce high-pressure refrigerant vapor, and the dilute solution is lithium bromide refrigerant, and the high-pressure refrigerant vapor flows into the condenser and is cooled into refrigerant liquid by cooling medium, and the cooling medium includes but is not limited to cooling water. Refrigerant liquid flows through throttling device into evaporator, and the throttling device includes but is not limited to throttling valve. In the evaporator, the refrigerant liquid absorbs the heat of the water in the cooling pipe to evaporate into low-pressure refrigerant vapor, and the refrigerant is produced, and the refrigerant includes water, brine or air, and the cooling pipe includes cooling coil. The chilled water flows into the air cooling pipe of air cooler 4 to cool the air, produces low-temperature cold energy, and the air cooling pipe includes air cooling coil, and the air cooler 4 is plate air cooler or fin air cooler, and the fins and heat exchange pipes of the fin air cooler are made of copper material, and the plate air cooler includes a plurality of parallel arranged heat exchange pipes, and the low-temperature chilled water flows in the heat exchange pipe, and the air flows in the channel outside the heat exchange pipe to exchange heat. The refrigerant pipeline between the condenser and the evaporator is also provided with a throttling valve for controlling the flow of refrigerant liquid. A chilled water pump is also provided for pumping chilled water to the air cooler 4 through the chilled water pipe.

[0030] A safety valve is provided on the generator, which automatically opens to release pressure when the pressure in the generator exceeds the set value to ensure safe operation of the system.

[0031] The dilute solution in the refrigeration module 6 is evaporated to flow the remaining concentrated solution through the solution heat exchanger, the concentrated solution exchanges heat with the pumped dilute solution in the solution heat exchanger, the concentrated solution flows to the absorber through the throttling valve, and the concentrated solution flows to the absorber and is combined with the low-pressure refrigerant vapor cooled by the cooling water, and is pumped to the solution heat exchanger by the solution pump.

[0032] The air quenching module includes a quenching chamber 1 containing aluminum alloy workpieces and a cold air conveying pipeline 2, the cold air conveying pipeline 2 includes a supply air pipeline and a return air pipeline, the cold air in the air cooling pipeline flows to the quenching chamber 1 through the air circulation fan 3 and the supply air pipeline, and the heated air in the quenching chamber 1 flows back to the air cooler 4 through the return air pipeline, forming a closed air circulation of the air quenching module, avoiding the decrease of air volume caused by insufficient air in the soundproof room 5. The cold air exchanges heat with the quenched aluminum alloy to achieve rapid cooling of the aluminum alloy workpieces. The air circulation fan 3 provides the flow and pressure of the cold air required for cooling the aluminum alloy workpieces. The air circulation fan 3 is a variable frequency fan, and the cold air flow into the quenching chamber 1 can be adjusted by adjusting the speed of the air circulation fan 3. An aluminum alloy placing rack is arranged in the quenching chamber 1 for containing the aluminum alloy workpieces to be quenched.

[0033] The control system includes a return air temperature sensor arranged in the quenching chamber 1 and / or the return air pipeline, the return air temperature sensor is used to monitor the temperature of the quenching chamber 1 and / or the flowing air, and the return air temperature sensor transmits the monitored temperature signal to the controller, which is a programmable controller or a single-chip microcomputer. The controller controls the exhaust fan 7, the air circulation fan 3 and the refrigeration module control system respectively, the exhaust fan 7 is used to adjust the flow of waste flue gas, the air circulation fan 3 is used to adjust the amount of cold air entering the quenching chamber 1, and the refrigeration module control system is used to control the solution pump of the refrigeration module, thereby adjusting the refrigerating capacity of the refrigerant. The control system automatically adjusts the flow of waste flue gas and the flow of refrigerant, thereby controlling the outlet water temperature of the chilled water, ultimately affecting the heat exchange effect of the air cooling pipeline, and realizing stable and efficient quenching process.

[0034] An exhaust fan 10 is arranged on the wall 11 of the soundproof room 5 to ensure the balance between the soundproof room 5 and the workshop temperature, so as to prevent the temperature in the soundproof room 5 from gradually rising, thereby affecting the quenching process and the operation of the equipment. The exhaust fan 10 is a wall type exhaust fan. The quenching chamber 1, the air circulation fan 3 and part of the cold air conveying pipeline 2 are installed in the soundproof room 5, and the soundproof room 5 is used to isolate the noise generated by the high speed of the air circulation fan 3. The inner wall of the quenching chamber 1 is provided with a heat preservation layer made of rock wool heat insulation material to reduce the heat loss in the quenching chamber 1.

[0035] Work flow:

[0036] Waste flue gas recovery process: Start the waste heat recovery module, refrigeration module 6 and air quenching module. The waste flue gas generated by the heat treatment equipment 12 flows into the heat exchanger 8 after passing through the waste flue gas collection pipe and filter.

[0037] Refrigeration process: The waste flue gas in heat exchanger 8 is added to the hot dilute solution in the generator, causing the refrigerant in the dilute solution to evaporate and form high-pressure refrigerant vapor. The high-pressure refrigerant vapor flows into the condenser and is cooled into refrigerant liquid by the cooling medium. The refrigerant liquid then flows into the evaporator, where it absorbs heat from the water in the cooling pipe and evaporates into low-pressure refrigerant vapor, while simultaneously producing chilled water. The chilled water flows into the air cooling pipe of air cooler 4 to cool the air and generate low-temperature cooling capacity.

[0038] Air quenching process: Cold air in the air cooler 4 flows to the quenching chamber 1 through the air circulation fan 3 and air supply duct, forming a closed air circulation in the air quenching module to rapidly cool the aluminum alloy workpiece. The control system automatically adjusts the waste gas flow rate and refrigerant flow rate based on the temperature parameters fed back by the return air temperature sensor, thereby controlling the outlet temperature of the chilled water and ultimately affecting the heat exchange effect of the air cooling pipe, achieving a stable and efficient quenching process. After the aluminum alloy workpiece is quenched, the waste heat recovery module, the refrigeration module 6, and the air quenching module are shut down sequentially.

[0039] It should be understood that, firstly, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change.

[0040] Secondly: The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.

[0041] Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An energy-saving rapid cooling system for air quenching of aluminum alloys, characterized in that: It includes a flue gas waste heat recovery module for collecting waste flue gas, which provides heat to a refrigeration module (6) and the refrigeration module (6) provides cold energy to an air quenching module to achieve air quenching of the workpiece; The flue gas waste heat recovery module includes a heat exchanger (8) connected to a waste flue gas collection pipe, and the waste flue gas provides heat to the cooling module (6) in the heat exchanger (8); The refrigeration module (6) includes a generator that absorbs heat from the heat exchanger (8). The refrigerant absorbs heat and evaporates in the generator to produce high-pressure refrigerant vapor. The high-pressure refrigerant vapor flows through the condenser and evaporator in sequence to cool the refrigerant and transform it into low-pressure refrigerant vapor. The refrigerant provides cooling capacity to the air quenching module. The air quenching module includes an air cooler (4) that absorbs the cold energy of the refrigerant. Air absorbs the cold energy in the air cooler (4) and is converted into cold air. The cold air is blown into the quenching chamber (1) by the air circulation fan (3) and air quenches the workpiece.

2. The energy-saving aluminum alloy air quenching rapid cooling system according to claim 1, characterized in that: The refrigeration module (6) further includes an absorber that mixes the refrigerant flowing out of the heat exchanger with the low-pressure refrigerant vapor. The mixed refrigerant is pumped by a solution pump into a solution heat exchanger for heat exchange and then flows to the generator. The refrigerant flowing out of the generator is heat exchanged by the heat exchanger and then flows to the absorber.

3. The energy-saving aluminum alloy air quenching rapid cooling system according to claim 1, characterized in that: The heat exchanger (8) is also provided with a waste gas passage, and the generator is also provided with a refrigerant passage. The heat exchanger (8) is a plate heat exchanger or a finned heat exchanger, which is used to increase the heat exchange area between the waste gas passage and the refrigerant passage.

4. The energy-saving aluminum alloy air quenching rapid cooling system according to claim 2, characterized in that: The heat exchanger (8) is connected to the flue gas duct (9), and the exhaust fan (7) is installed on the flue gas duct (9). The exhaust fan (7) provides pressure to the waste flue gas to compensate for the pressure loss of the waste flue gas.

5. The energy-saving aluminum alloy air quenching rapid cooling system according to claim 1, characterized in that: The air cooler (4) is a plate air cooler or a finned air cooler.

6. The energy-saving aluminum alloy air quenching rapid cooling system according to claim 4, characterized in that: The air quenching module also includes a cold air delivery pipe (2), which includes an air supply pipe and a return air pipe. The air heated in the quenching chamber (1) flows back to the air cooler (4) through the return air pipe to form an air circulation.

7. The energy-saving aluminum alloy air quenching rapid cooling system according to claim 6, characterized in that: A control system including a return air temperature sensor is also provided. The return air temperature sensor is installed inside the quenching chamber (1) and / or the return air duct and transmits the monitored temperature signal to the controller. The controller controls the exhaust fan (7), the air circulation fan (3) and the refrigeration module control system respectively. The refrigeration module control system is used to control the solution pump of the refrigeration module.

8. The energy-saving aluminum alloy air quenching rapid cooling system according to claim 6, characterized in that: The quenching chamber (1) and the air circulation fan (3) are located in the soundproof room (5). The soundproof room (5) is used to block noise. The soundproof room (5) is equipped with an exhaust fan (10) to balance the temperature inside and outside the soundproof room (5).

9. The energy-saving aluminum alloy air quenching rapid cooling system according to claim 1, characterized in that: The inner wall of the quenching chamber (1) is provided with a heat insulation layer.

10. The energy-saving aluminum alloy air quenching rapid cooling system according to claim 1, characterized in that: A safety valve is installed on the generator.

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