Heat generating unit cooling gas waste heat utilization device

Abstract

The utility model provides a kind of heat generating unit cooling gas waste heat utilization device, it is related to waste heat utilization device technical field, device includes: with the heat air outlet of heat generating unit intercommunication's pipeline system;Adjustable speed air extraction device is arranged in pipeline system;With adjustable speed air extraction device electric connection's controller;Air flow meter is arranged in pipeline system, located adjustable speed air extraction device downstream, and with controller electric connection;Wherein, when heat generating unit cooling gas waste heat utilization device is in working condition, controller controls the working parameter of adjustable speed air extraction device with the purpose of making first air mass flow equal to second air mass flow;First air mass flow is the mass flow of hot air generated by heat generating unit, and second air mass flow is the mass flow of hot air extracted via adjustable speed air extraction device.The device can efficiently recover waste heat without affecting the safe and stable operation of heat generating unit itself.

Description

Technical Field

[0001] This utility model relates to the technical field of waste heat utilization devices, specifically to a waste heat utilization device for cooling gas of a heat-generating unit. Background Technology

[0002] Heat-generating units, such as air compressors, produce a large amount of heat during operation. To ensure the normal and safe operation of these units, a cooling system must be used to remove this heat in a timely manner, so that the unit's temperature remains within its normal operating range.

[0003] For heat-generating units that use air cooling, the unit is usually cooled by drawing in ambient air with a fan, and then the high-temperature gas carrying a large amount of heat energy is directly discharged into the atmosphere, which results in a huge waste of energy.

[0004] Therefore, how to efficiently recover waste heat without affecting the safe and stable operation of the heat-generating unit itself has become an urgent technical problem to be solved. Utility Model Content

[0005] In view of this, in order to solve the above-mentioned technical problems, this utility model provides a device for utilizing waste heat from cooling gas of a heat-generating unit.

[0006] The present invention adopts the following technical solution: A waste heat recovery device for cooling gas from a heat-generating unit, comprising: A piping system connected to the hot air outlet of a heat-generating unit; An adjustable-speed exhaust device installed in the pipeline system; The controller is electrically connected to the adjustable speed exhaust device; An air flow meter installed in the pipeline system, located downstream of the adjustable speed exhaust device, and electrically connected to the controller; When the waste heat recovery device for cooling gas of the heat-generating unit is in operation, the air flow meter measures the second air mass flow rate and sends the second air mass flow rate to the controller; the controller controls the operating parameters of the adjustable speed exhaust device with the aim of making the first air mass flow rate equal to the second air mass flow rate; wherein, the first air mass flow rate is the mass flow rate of the hot air generated by the heat-generating unit, and the second air mass flow rate is the mass flow rate of the hot air extracted by the adjustable speed exhaust device.

[0007] Optionally, the waste heat recovery device for the cooling gas of this heat-generating unit also includes: A flow channel switching device is installed in the pipeline system, located between the adjustable speed exhaust device and the hot air outlet of the heat generating unit, and electrically connected to the controller. The controller controls the working state of the flow channel switching device to open the first channel for hot air to be guided from the heat-generating unit to the adjustable speed exhaust device when the waste heat utilization device for the cooling gas of the heat-generating unit is in working state, and to cut off the first channel for hot air to be guided from the heat-generating unit to the adjustable speed exhaust device when the waste heat utilization device for the cooling gas of the heat-generating unit stops working.

[0008] Optionally, the flow channel switching device includes: a gate, a gate drive mechanism, and a rotating shaft; The rotating shaft is mounted on the pipe wall of the piping system; The gate drive mechanism is electrically connected to the controller. The controller drives the gate to rotate around the shaft through the gate drive mechanism to open or cut off the first channel from the heat-generating unit to the adjustable speed exhaust device.

[0009] Optionally, a second channel opening is provided on the pipe wall of the pipeline system; The second channel opening is correspondingly provided with the gate plate. When the gate plate is rotated to a state of being in contact with the pipe wall of the pipeline system, the gate plate blocks the second channel opening to prevent hot air from being guided from the heat generating unit to the second channel. When the gate is rotated to a position perpendicular to the pipe wall of the piping system, the first channel is cut off, and hot air is guided from the heat-generating unit to the second channel for discharge.

[0010] Optionally, the flow channel switching device includes: a first valve and a second valve; Both the first valve and the second valve are electrically connected to the controller; The first valve is installed on the first channel, and the controller controls the opening and closing state of the first valve to open or close the first channel. The second valve is installed on the pipe wall of the pipeline system, and the controller controls the opening and closing state of the second valve to open or close the second channel; the second channel is another channel that is different from the first channel.

[0011] Optionally, both the first valve and the second valve are normally open valves.

[0012] Optionally, the adjustable speed exhaust device is a variable frequency axial flow fan.

[0013] Optionally, the controller is a programmable logic controller.

[0014] This utility model adopts the above technical solution to provide a waste heat recovery device for cooling gas from a heat-generating unit, comprising: a pipeline system connected to the hot air outlet of the heat-generating unit; an adjustable speed exhaust device installed in the pipeline system; a controller electrically connected to the adjustable speed exhaust device; and an air flow meter installed in the pipeline system, downstream of the adjustable speed exhaust device, and electrically connected to the controller. When the waste heat recovery device is in operation, the air flow meter measures a second air mass flow rate and sends this second air mass flow rate to the controller. The controller controls the operating parameters of the adjustable speed exhaust device to make the first air mass flow rate equal to the second air mass flow rate. The first air mass flow rate is the mass flow rate of the hot air generated by the heat-generating unit, and the second air mass flow rate is the mass flow rate of the hot air extracted by the adjustable speed exhaust device. Based on this, the controller directs the adjustable-speed exhaust fan to actively extract hot air, and the control strategy dynamically matches the mass flow rate of the extracted hot air with the mass flow rate of the hot air generated by the heat-generating unit. This ensures that the amount of hot air extracted by the waste heat recovery device is exactly the amount of hot air that the heat-generating unit needs to discharge, maximizing heat recovery while avoiding interference with the heat dissipation balance of the heat-generating unit itself. This achieves efficient waste heat recovery without affecting the safe and stable operation of the heat-generating unit. Furthermore, the device has a simple structure, reducing production costs, and can operate automatically without manual intervention, further reducing operating costs. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of a waste heat utilization device for cooling gas of a heat-generating unit provided in an embodiment of this utility model. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0018] Figure 1This is a schematic diagram of a waste heat recovery device for cooling gas from a heat-generating unit, provided in an embodiment of this utility model. Figure 1 As shown, this device includes: Piping system 11 connected to the hot air outlet of heat-generating unit 14.

[0019] An adjustable speed exhaust device 12 is installed in the piping system 11.

[0020] A controller 13 is electrically connected to the adjustable speed exhaust device 12.

[0021] An air flow meter installed in the piping system 11, downstream of the adjustable speed exhaust device 12, and electrically connected to the controller 13. Figure 1 (Not shown in the image). An air flow meter is installed at the air outlet of the adjustable speed exhaust device 12.

[0022] When the waste heat recovery device for the cooling gas of the heat-generating unit is in operation, the air flow meter measures the second air mass flow rate Q2 and sends the second air mass flow rate Q2 to the controller 13; the controller 13 controls the operating parameters of the adjustable speed exhaust device 12 with the aim of making the first air mass flow rate Q1 equal to the second air mass flow rate Q2; wherein, the first air mass flow rate Q1 is the mass flow rate of the hot air generated by the heat-generating unit, and the second air mass flow rate Q2 is the mass flow rate of the hot air extracted by the adjustable speed exhaust device.

[0023] It should be noted that the first air mass flow rate Q1 is determined based on the actual operating power W (dynamically changing) of the heat-generating unit 14 and the ambient air temperature T0. The controller can pre-store a lookup table that associates the actual operating power W and ambient air temperature T0 with the first air mass flow rate Q1. Later, the lookup table is consulted based on the actual operating power W and ambient air temperature T0 to obtain the first air mass flow rate Q1.

[0024] The ambient air temperature T0 is obtained by a thermometer installed at the heat-generating unit 14. This thermometer is electrically connected to the controller 13 and sends the measured ambient air temperature T0 to the controller 13. The controller 13 is also electrically connected to the heat-generating unit 14 to obtain the actual operating power W of the heat-generating unit 14.

[0025] This embodiment of the invention adopts the above-described technical solution. The controller controls the adjustable-speed exhaust device to actively extract hot air, and the control strategy dynamically matches the mass flow rate of the extracted hot air with the mass flow rate of the hot air generated by the heat-generating unit. This allows the invention to ensure, to a certain extent, that the amount of hot air extracted by the waste heat recovery device is exactly the amount of hot air that the heat-generating unit needs to discharge. This maximizes heat recovery while avoiding interference with the heat dissipation balance of the heat-generating unit itself, achieving efficient waste heat recovery without affecting the safe and stable operation of the heat-generating unit. Furthermore, the device has a simple structure, reducing production costs, and can operate automatically without manual intervention, further reducing operating costs.

[0026] In this embodiment of the invention, the waste heat recovery device for the cooling gas of the heat-generating unit may further include: A flow channel switching device installed in the pipeline system, located between the adjustable speed exhaust device and the hot air outlet of the heat generation unit, and electrically connected to the controller.

[0027] The controller controls the working state of the flow channel switching device to open the first channel for hot air to be guided from the heat-generating unit to the adjustable speed exhaust device when the waste heat utilization device for the cooling gas of the heat-generating unit is in operation, and to cut off the first channel for hot air to be guided from the heat-generating unit to the adjustable speed exhaust device when the waste heat utilization device for the cooling gas of the heat-generating unit stops working.

[0028] In a specific example, such as Figure 1 As shown, the flow channel switching device may include: a gate 153, a gate drive mechanism 151, and a rotating shaft 152.

[0029] The rotating shaft 152 is installed on the pipe wall of the piping system 11.

[0030] The gate drive mechanism 151 is electrically connected to the controller 13. The controller 13 drives the gate 153 to rotate around the rotating shaft 152 through the gate drive mechanism 151, so as to open or cut off the first channel for hot air to be guided from the heat generating unit to the adjustable speed exhaust device.

[0031] Specifically, the gate drive mechanism 151 can be an electric push rod, a worm gear mechanism driven by a stepper motor, or a cylinder. When the gate 153 rotates to position oa, it opens the first channel for hot air to be guided from the heat generating unit to the adjustable speed exhaust device; when the gate 153 rotates to position ob, it cuts off the first channel for hot air to be guided from the heat generating unit to the adjustable speed exhaust device. Point o is located on the rotating shaft 152.

[0032] In addition, a second access port is provided on the pipe wall of the piping system.

[0033] The second channel opening is correspondingly set with the gate 153. When the gate 153 is rotated to the state of being in contact with the pipe wall of the pipeline system (i.e., rotated to the oa position), the gate will block the second channel opening to prevent hot air from being guided from the heat generation unit to the second channel.

[0034] When the gate is rotated to a position perpendicular to the pipe wall of the piping system (i.e., rotated to the ob position), the first channel is cut off, and hot air is guided from the heat-generating unit to the second channel for discharge.

[0035] In another specific example, the flow channel switching device may include: a first valve and a second valve.

[0036] Both the first and second valves are electrically connected to the controller.

[0037] The first valve is installed on the first channel, and the controller controls the opening and closing state of the first valve to open or close the first channel.

[0038] The second valve is installed on the pipe wall of the pipeline system. The controller controls the opening and closing state of the second valve to open or close the second channel. The second channel is a different channel from the first channel.

[0039] When the waste heat recovery device is working, the controller controls the first valve to open and the second valve to close, so that hot air is directed from the heat generation unit to the adjustable speed exhaust device; when the waste heat recovery device stops working, the controller controls the first valve to close and the second valve to open, so that hot air is directed from the heat generation unit to the second channel and finally flows into the atmosphere.

[0040] The above solution, through the control of the flow channel switching device, can completely isolate the waste heat recovery device when it stops working, ensuring that the heat generation unit can dissipate heat normally in the original manner (directly discharging hot air into the atmosphere). This ensures that the start-up and shutdown of the waste heat recovery device will not affect the independent operation of the heat generation unit, guaranteeing the safety of equipment operation.

[0041] Both the first and second valves can be normally open valves. For example, they can be normally open solenoid valves or pneumatic valves. Thus, when the waste heat recovery device stops working (normal shutdown or unexpected power outage), the controller loses power, and the first and second valves remain or return to their normally open state due to the loss of power. At this time, even if there is an obstruction in the first channel, hot air can still be directly discharged through the second channel, providing double safety for the heat-generating unit and reducing the possibility of heat dissipation obstruction due to a malfunction of the waste heat recovery device.

[0042] In this embodiment of the invention, the adjustable speed exhaust device can be a variable frequency axial flow fan.

[0043] In this embodiment of the invention, the controller can be a PLC (Programmable Logic Controller).

[0044] It is understood that the same or similar parts in the above embodiments can be referred to each other, and the contents not described in detail in some embodiments can be referred to the same or similar contents in other embodiments.

[0045] It should be noted that in the description of this utility model, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means at least two.

[0046] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0047] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A device for utilizing waste heat from cooling gas in a heat-generating unit, characterized in that, include: A piping system connected to the hot air outlet of a heat-generating unit; An adjustable-speed exhaust device installed in the pipeline system; The controller is electrically connected to the adjustable speed exhaust device; An air flow meter installed in the pipeline system, located downstream of the adjustable speed exhaust device, and electrically connected to the controller; When the waste heat recovery device for cooling gas of the heat-generating unit is in operation, the air flow meter measures the second air mass flow rate and sends the second air mass flow rate to the controller; The controller controls the operating parameters of the adjustable-speed exhaust device to make the first air mass flow rate equal to the second air mass flow rate; wherein, the first air mass flow rate is the mass flow rate of the hot air generated by the heat-generating unit, and the second air mass flow rate is the mass flow rate of the hot air extracted by the adjustable-speed exhaust device.

2. The waste heat recovery device for cooling gas of a heat-generating unit according to claim 1, characterized in that, Also includes: A flow channel switching device is installed in the pipeline system, located between the adjustable speed exhaust device and the hot air outlet of the heat generating unit, and electrically connected to the controller. The controller controls the working state of the flow channel switching device to open the first channel for hot air to be guided from the heat-generating unit to the adjustable speed exhaust device when the waste heat utilization device for the cooling gas of the heat-generating unit is in working state, and to cut off the first channel for hot air to be guided from the heat-generating unit to the adjustable speed exhaust device when the waste heat utilization device for the cooling gas of the heat-generating unit stops working.

3. The waste heat recovery device for cooling gas of a heat-generating unit according to claim 2, characterized in that, The flow channel switching device includes: a gate, a gate drive mechanism, and a rotating shaft; The rotating shaft is mounted on the pipe wall of the piping system; The gate drive mechanism is electrically connected to the controller. The controller drives the gate to rotate around the shaft through the gate drive mechanism to open or cut off the first channel from the heat-generating unit to the adjustable speed exhaust device.

4. The waste heat recovery device for cooling gas of a heat-generating unit according to claim 3, characterized in that, The pipeline system has a second channel opening on the pipe wall; The second channel opening is correspondingly provided with the gate plate. When the gate plate is rotated to a state of being in contact with the pipe wall of the pipeline system, the gate plate blocks the second channel opening to prevent hot air from being guided from the heat generating unit to the second channel. When the gate is rotated to a position perpendicular to the pipe wall of the piping system, the first channel is cut off, and hot air is guided from the heat-generating unit to the second channel for discharge.

5. The waste heat recovery device for cooling gas of a heat-generating unit according to claim 2, characterized in that, The flow channel switching device includes: a first valve and a second valve; Both the first valve and the second valve are electrically connected to the controller; The first valve is installed on the first channel, and the controller controls the opening and closing state of the first valve to open or close the first channel. The second valve is installed on the pipe wall of the pipeline system, and the controller controls the opening and closing state of the second valve to open or close the second channel; the second channel is another channel that is different from the first channel.

6. The waste heat recovery device for cooling gas of a heat-generating unit according to claim 5, characterized in that, Both the first valve and the second valve are normally open valves.

7. The waste heat recovery device for cooling gas of a heat-generating unit according to claim 1, characterized in that, The adjustable speed exhaust device is a variable frequency axial flow fan.

8. The waste heat recovery device for cooling gas of a heat-generating unit according to claim 1, characterized in that, The controller is a programmable logic controller.

Images