A tunnel kiln waste heat heating system

Abstract

The utility model discloses a tunnel kiln waste heat heating system belongs to heat energy recycling technical field, including by the circulating loop that buffer water jar, water pump, heat exchanger and radiator are connected, still include pressure transmitter and audible -visual alarm, and pressure transmitter installs on the circulating pipeline and electric connection audible -visual alarm, the system still includes liquid level controller, water replenishing solenoid valve and water replenishing jar, and liquid level controller sets up in buffer water jar, and electric connection water replenishing solenoid valve that installs on water replenishing pipeline, and water replenishing pipeline links up water replenishing jar and buffer water jar. The utility model discloses through integrated safety alarm and automatic water replenishing structure, has realized to the real -time early warning of system pressure anomaly and the automatic constant control to water level, has improved the automation level and operation safety of system significantly, need not manual intervention, and the structure is reliable, and the energy -saving effect is good.

Description

Technical Field

[0001] This utility model relates to the field of heat energy recovery and utilization technology, and in particular to a waste heat heating system for tunnel kilns. Background Technology

[0002] Tunnel kilns are widely used thermal equipment in the industrial production of ceramics, building materials, and other industries. During the firing process, tunnel kilns generate a large amount of high-temperature flue gas containing enormous heat energy; this heat is known as the waste heat of the tunnel kiln.

[0003] To recover and utilize this energy, some simple waste heat heating devices for tunnel kilns have emerged. These devices typically use the principle of water circulation heat exchange to extract waste heat from the kiln for winter heating. However, existing devices of this type are often rudimentary in their structural design, have a low degree of automation, and generally rely on manual operation and monitoring.

[0004] Specifically, during system operation, circulating water is continuously lost through evaporation, requiring operators to periodically inspect and manually replenish the water based on experience. This not only increases labor intensity but also makes it difficult to guarantee the accuracy and stability of the water volume. More seriously, if operators are negligent and fail to replenish water in time, or if unexpected situations such as pipeline leaks occur in the system, the circulating water pump will run dry due to lack of water, easily burning out within a short period, causing the entire system to fail and incurring maintenance costs. Existing technologies generally lack automatic monitoring and early warning mechanisms for critical operating states such as system water shortage and abnormal pressure, resulting in serious safety hazards in system operation.

[0005] Therefore, this utility model proposes a waste heat heating system for tunnel kilns to address the shortcomings of existing technologies. Utility Model Content

[0006] To overcome the above shortcomings, this utility model provides a waste heat heating system for tunnel kilns, aiming to improve the problems of low automation, reliance on manual operation, and lack of automatic monitoring and safety early warning structure for faults such as water shortage or abnormal pressure in existing tunnel kiln waste heat heating systems, which lead to low operational reliability and safety hazards. This utility model aims to provide a tunnel kiln waste heat heating system with an improved structure that can effectively solve the above problems.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a waste heat heating system for a tunnel kiln, comprising: a buffer water tank, a water pump, a heat exchanger, and radiators; as well as a pressure transmitter, an audible and visual alarm, a water supply tank, a water supply solenoid valve, and a liquid level controller.

[0008] The outlet of the water pump is connected to the inlet of the radiator through a first circulation pipe, the outlet of the radiator is connected to the inlet of the heat exchanger through a second circulation pipe, the outlet of the heat exchanger is connected to the buffer tank through a return water pipe, and the outlet of the buffer tank is connected to the inlet of the water pump, forming a closed hot water circulation loop. Furthermore, the pressure transmitter is installed on the first circulation pipeline to detect the fluid pressure in the first circulation pipeline, and the signal output terminal of the pressure transmitter is electrically connected to the signal input terminal of the audible and visual alarm; the outlet of the water replenishment tank is connected to the side wall of the buffer water tank through a water replenishment pipeline, and the water replenishment solenoid valve is installed in series on the water replenishment pipeline; the liquid level controller is located inside the buffer water tank, and the signal output terminal of the liquid level controller is electrically connected to the control terminal of the water replenishment solenoid valve.

[0009] Preferably, the on / off valve is provided on the second circulation pipeline.

[0010] Preferably, the opening and closing valve is a pressure valve, and the valve core of the pressure valve is opened by the fluid pressure in the second circulation pipeline.

[0011] Preferably, the level controller includes an upper float and a lower float that slide along a vertical guide rod, the upper float being used to sense high water level and the lower float being used to sense low water level.

[0012] Preferably, a thermometer for displaying water temperature and a level gauge for displaying water level are also fixedly installed on the outer wall of the buffer tank.

[0013] Preferably, the heat exchanger is a shell-and-tube heat exchanger, the shell of which is installed inside the flue of the tunnel kiln.

[0014] Preferably, the water pump, the audible and visual alarm, the buffer tank, and the replenishment tank are all fixedly installed on the same base.

[0015] Preferably, a filter is also provided on the first circulation pipe between the outlet of the water pump and the installation position of the pressure transmitter.

[0016] This utility model has the following beneficial effects: In this invention, by installing a pressure transmitter on the circulation pipeline and electrically connecting it to an audible and visual alarm, the problem of existing waste heat recovery systems being unable to detect faults such as water shortage or leakage in the pipeline in a timely manner, which easily leads to pump idling and damage and poses safety hazards, is solved. This invention achieves the effect of real-time monitoring of the system operating pressure and automatic alarm when abnormalities occur, greatly improving the operational safety and reliability of the system.

[0017] This invention solves the problems of frequent manual water replenishment due to water evaporation, cumbersome operation, and unstable water volume affecting heating performance in existing systems by setting a level controller in the buffer tank and electrically linking it with the water replenishment solenoid valve. It achieves the effect of automatically maintaining a constant water volume in the system, reducing manual maintenance costs and ensuring stable heating efficiency of the system. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of a waste heat heating system for a tunnel kiln proposed in this utility model. Figure 2 This is a schematic diagram of the water pump section of a waste heat heating system for a tunnel kiln proposed in this utility model. Figure 3 for Figure 2 Enlarged view of point A in the image; Figure 4 This is a schematic diagram of the radiator section of a waste heat heating system for a tunnel kiln proposed in this utility model.

[0019] Legend: 1. Water pump; 2. Audible and visual alarm; 3. Pressure transmitter; 4. Buffer tank; 5. Liquid level controller; 6. Water supply solenoid valve; 7. Water supply tank; 8. Heat exchanger; 9. On / off valve; 10. Radiator. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] like Figure 1 As shown, the waste heat heating system of the tunnel kiln consists of a closed loop and a safety alarm structure and an automatic water replenishment structure integrated into the loop. The loop includes a buffer tank 4, a water pump 1, a heat exchanger 8, and a radiator 10.

[0022] Specifically, the outlet of water pump 1 is connected to the inlet of radiator 10 through a first circulation pipe, and the outlet of radiator 10 is connected to the inlet of heat exchanger 8 through a second circulation pipe. An on / off valve 9 is installed on the second circulation pipe. The outlet of heat exchanger 8 is connected to buffer tank 4 through a return water pipe, and the outlet of buffer tank 4 is connected to the inlet of water pump 1, thus forming a complete circulation path for transporting hot water. The safety alarm structure of this system includes a pressure transmitter 3 and an audible and visual alarm 2. The pressure transmitter 3 is installed on the first circulation pipe to detect the fluid pressure within the first circulation pipe. The signal output terminal of 3 is electrically connected to the signal input terminal of the audible and visual alarm 2, which is used to provide audible and visual warnings when the pressure in the circulation loop is abnormal. The automatic water replenishment structure of the system includes a water replenishment tank 7, a water replenishment solenoid valve 6, and a liquid level controller 5. The outlet of the water replenishment tank 7 is connected to the side wall of the buffer water tank 4 through a water replenishment pipe. The water replenishment solenoid valve 6 is installed in series on the water replenishment pipe. The liquid level controller 5 is located inside the buffer water tank 4, and the signal output terminal of the liquid level controller 5 is electrically connected to the control terminal of the water replenishment solenoid valve 6, which is used to automatically control the opening and closing of the water replenishment solenoid valve 6 according to the liquid level in the buffer water tank 4 to maintain a constant system water volume.

[0023] The automatic water replenishment structure consists of a level controller 5, a water replenishment solenoid valve 6, and a water replenishment tank 7. The water replenishment tank 7 serves as the system's supplementary water source. Its outlet is connected to the water inlet on the upper side wall of the buffer tank 4 via a water replenishment pipe. The water replenishment solenoid valve 6 is threadedly connected in series to the water replenishment pipe to control its opening and closing. The level controller 5 is fixedly installed inside the buffer tank 4 via a mounting flange. The level controller 5 includes an upper float and a lower float that slide along a vertical guide rod. The upper float senses the high water level, and the lower float senses the low water level. In terms of control, the signal output of the level controller 5 is connected to the control valve 6 via an insulated wire. The system is electrically connected to the control end. When the water level in the buffer tank 4 drops to the point where it triggers the lower float due to evaporation or other reasons, the level controller 5 outputs an open signal. Upon receiving the open signal, the water supply solenoid valve 6 opens, and water from the water supply tank 7 flows into the buffer tank 4 through the water supply pipe. When the water level in the buffer tank 4 continues to rise to the point where it triggers the upper float, the level controller 5 outputs a close signal. Upon receiving the close signal, the water supply solenoid valve 6 closes, thus stopping the water supply process. This closed-loop control structure, consisting of float position sensing and solenoid valve opening and closing, ensures that the water volume in the circulation loop is always maintained within a preset stable range, providing a fundamental guarantee for the stable operation of the entire system.

[0024] The automatic water replenishment structure consists of a level controller 5, a water replenishment solenoid valve 6, and a water replenishment tank 7. The water replenishment tank 7 serves as the system's supplementary water source. Its outlet is connected to the water inlet on the upper side wall of the buffer tank 4 via a water replenishment pipe. The water replenishment solenoid valve 6 is threadedly connected in series to the water replenishment pipe to control its opening and closing. The level controller 5 is fixedly installed inside the buffer tank 4 via a mounting flange. The level controller 5 includes an upper float and a lower float that slide along a vertical guide rod. The upper float senses the high water level, and the lower float senses the low water level. In terms of control, the signal output of the level controller 5 is connected to the control valve 6 via an insulated wire. The system is electrically connected to the control end. When the water level in the buffer tank 4 drops to the point where it triggers the lower float due to evaporation or other reasons, the level controller 5 outputs an open signal. Upon receiving the open signal, the water supply solenoid valve 6 opens, and water from the water supply tank 7 flows into the buffer tank 4 through the water supply pipe. When the water level in the buffer tank 4 continues to rise to the point where it triggers the upper float, the level controller 5 outputs a close signal. Upon receiving the close signal, the water supply solenoid valve 6 closes, thus stopping the water supply process. This closed-loop control structure, consisting of float position sensing and solenoid valve opening and closing, ensures that the water volume in the circulation loop is always maintained within a preset stable range, providing a fundamental guarantee for the stable operation of the entire system.

[0025] In a preferred embodiment, in order to control the water flow into the heat exchanger 8, an on / off valve 9 is installed on the second circulation pipe, specifically between the outlet of the radiator 10 and the inlet of the heat exchanger 8, via a flange connection.

[0026] As a more specific embodiment of the above-mentioned on-off valve 9, the on-off valve 9 is a pressure valve. The valve core of the pressure valve is opened by the fluid pressure in the second circulation pipeline. When the water pump 1 is working, the pressure built up in the pipeline will push the valve core to overcome the spring force and open. When the water pump 1 stops, the pressure disappears, and the valve core resets and closes under the action of the spring force.

[0027] As a preferred embodiment, please refer to Figure 1 and Figure 2 In order to intuitively monitor the water temperature and water level in the system, a thermometer for displaying the water temperature and a level gauge for displaying the water level are also fixedly installed on the outer wall of the buffer tank 4, so that maintenance personnel can quickly grasp the system status during inspections.

[0028] In a preferred embodiment, in order to improve heat exchange efficiency, the heat exchanger 8 is a shell-and-tube heat exchanger 8, and the shell of the heat exchanger 8 is installed in the flue of the tunnel kiln, so that the circulating water can fully exchange heat with the high-temperature flue gas.

[0029] As a preferred embodiment, in order to make the layout of the entire system more compact and easier to install and transport, the water pump 1, the audible and visual alarm 2, the buffer water tank 4, and the water replenishment tank 7 are all fixedly installed on the same base by anchor bolts.

[0030] In a preferred embodiment, to prevent impurities in the circulating water from clogging the pipes or damaging the equipment, a filter is also installed on the first circulating pipe between the outlet of the water pump 1 and the installation position of the pressure transmitter 3 via a threaded connection.

[0031] Working principle: When the system starts, water pump 1 begins to work, drawing water from the buffer tank 4 and pumping it into the first circulation pipe, establishing circulation pressure within the pipe. The pressurized circulating water first flows through each radiator 10, dissipating heat into the indoor environment to achieve the purpose of heating. The water flowing out of the radiators 10 continues to flow in the second circulation pipe. The pressure generated by the water flow opens the valve core of the on / off valve 9, allowing the water to smoothly enter the heat exchanger 8. Inside the heat exchanger 8, the circulating water exchanges heat with the high-temperature flue gas in the tunnel kiln flue, heating the water. During system operation, the automatic water replenishment mechanism monitors the water level of the buffer tank 4 in real time. When the water level falls below the preset minimum point, the lower float of the level controller 5 is triggered, and the electrical signal causes the water replenishment solenoid valve 6 to open, automatically injecting water from the water replenishment tank 7 into the buffer tank 4. When the water level rises back to the preset maximum point, the upper float of the level controller 5 is triggered, and the electrical signal causes the water replenishment solenoid valve 6 to close, stopping water replenishment. Meanwhile, the safety alarm structure continuously monitors the pressure of the circulation loop. Pressure transmitter 3 detects the water pressure in the first circulation pipeline in real time. Under normal operating conditions, the pressure remains within a stable range. If a pipeline leak or water shortage causes a sudden drop in pressure, pressure transmitter 3 will immediately transmit the abnormal pressure signal to audible and visual alarm 2, which will then issue an audible and visual alarm to remind maintenance personnel to handle the situation promptly.

[0032] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. 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. A waste heat heating system for a tunnel kiln, comprising a buffer tank (4), a water pump (1), a heat exchanger (8), and a radiator (10), wherein the outlet of the water pump (1) is connected to the inlet of the radiator (10) through a first circulation pipe, the outlet of the radiator (10) is connected to the inlet of the heat exchanger (8) through a second circulation pipe, the outlet of the heat exchanger (8) is connected to the buffer tank (4) through a return water pipe, and the outlet of the buffer tank (4) is connected to the inlet of the water pump (1); Its features are, The system also includes a pressure transmitter (3) and an audible and visual alarm (2). The pressure transmitter (3) is installed on the first circulation pipeline to detect the fluid pressure in the first circulation pipeline, and the signal output terminal of the pressure transmitter (3) is electrically connected to the signal input terminal of the audible and visual alarm (2). The system also includes a water replenishment tank (7), a water replenishment solenoid valve (6), and a level controller (5); the outlet of the water replenishment tank (7) is connected to the side wall of the buffer water tank (4) through a water replenishment pipe, and the water replenishment solenoid valve (6) is installed in series on the water replenishment pipe; the level controller (5) is located inside the buffer water tank (4), and the signal output terminal of the level controller (5) is electrically connected to the control terminal of the water replenishment solenoid valve (6).

2. The waste heat heating system for a tunnel kiln according to claim 1, characterized in that, An on / off valve (9) is installed on the second circulation pipeline.

3. The waste heat heating system for a tunnel kiln according to claim 2, characterized in that, The opening and closing valve (9) is a pressure valve, and the valve core of the pressure valve is opened by the fluid pressure in the second circulation pipeline.

4. The waste heat heating system for a tunnel kiln according to claim 1, characterized in that, The liquid level controller (5) includes an upper float and a lower float that slide along a vertical guide rod. The upper float is used to sense high water level, and the lower float is used to sense low water level.

5. A waste heat heating system for a tunnel kiln according to claim 1, characterized in that, The outer wall of the buffer water tank (4) is also fixedly equipped with a thermometer for displaying water temperature and a level gauge for displaying water level.

6. A waste heat heating system for a tunnel kiln according to claim 1, characterized in that, The heat exchanger (8) is a shell-and-tube heat exchanger (8), and its shell is installed inside the flue of the tunnel kiln.

7. A waste heat heating system for a tunnel kiln according to claim 1, characterized in that, The water pump (1), the audible and visual alarm (2), the buffer water tank (4), and the water replenishment tank (7) are all fixedly installed on the same base.

8. A waste heat heating system for a tunnel kiln according to claim 1, characterized in that, A filter is also provided on the first circulation pipe between the outlet of the water pump (1) and the installation position of the pressure transmitter (3).

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