Circulating water cooling system of heating furnace

Abstract

A heating furnace circulating water cooling system comprises a plurality of heating furnaces with cooling water channels, water inlet outer pipelines connected with water inlet pipes of the cooling water channels respectively and water outlet outer pipelines connected with water outlet pipes of the cooling water channels respectively. The system is characterized by further comprising a cooling tower frequency conversion control mechanism for performing frequency conversion control on the water flow of the water inlet outer pipeline and the water outlet outer pipeline, the water inlet outer pipeline and the water outlet outer pipeline are connected through the cooling tower frequency conversion control mechanism to form a cooling water circulation loop, and a water outlet pipe of the cooling water channel is provided with a water outlet temperature sensor. Adjusting valve sets are installed on water outlet pipes or water inlet pipes of the cooling water channels, the adjusting valve sets and the outlet water temperature sensors are in signal transmission connection with control systems of the corresponding heating furnaces, and the control systems of the heating furnaces are in signal transmission connection with the cooling tower frequency conversion control mechanism. The system structure is simplified, adjustment, control, maintenance and overhaul are convenient, the space occupancy rate is small, and energy conservation and consumption reduction are achieved.

Description

Technical Field

[0001] The utility model relates to a circulating water cooling system for a heating furnace, belonging to the technical field of water cooling for heating furnaces. Background Art

[0002] Heat treatment circulating water system refers to a water circulation system dedicated to cooling heat treatment equipment. It is usually powered by a water pump to make cooling water pass through the heat treatment equipment uninterruptedly and form a cycle to achieve the purpose of cooling. For example: cemented carbide sintering furnace, the sintering temperature exceeds 1500℃. In order to protect the equipment furnace and equipment shell, electrodes, etc., circulating water is required for cooling and cooling. The traditional way is that cooling water cooling is to circulate uninterruptedly according to the maximum amount of water required at the highest temperature. In fact, there is no need for large flow cooling water in the stages of furnace loading, low temperature, and furnace discharge. The cooling water can even be suspended during the shutdown stage. In order to achieve energy saving and consumption reduction, a cooling water system including an internal circulation cooling path for cooling a single heating furnace and an external circulation cooling path for absorbing the heat of the internal circulation has emerged. The external circulation cooling path and the internal circulation cooling path are independent of each other. Although energy saving and consumption reduction can be achieved, the structure is complex, the investment cost is high, and the maintenance cost is high. In the event of failures such as failure of the internal circulation water pump or control system, it is necessary to manually switch to the external circulation emergency to avoid high temperature burnout of the equipment and occupy the production workshop space. Utility Model Content

[0003] The utility model provides a heating furnace circulating water cooling system, in which the internal circulation of the heating furnace and the external circulation of cooling water are interconnected and are not independent of each other, thus simplifying the system structure, facilitating adjustment, control, maintenance and overhaul, and having a small space occupancy rate. On the basis of ensuring effective cooling, the power consumption of the frequency conversion control mechanism of the cooling tower is reduced, thereby achieving energy saving and consumption reduction.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A heating furnace circulating water cooling system comprises a plurality of heating furnaces with cooling water channels, external water inlet pipes respectively connected to the water inlet pipes of the cooling water channels and external water outlet pipes respectively connected to the water outlet pipes of the cooling water channels, and is characterized in that it also comprises a cooling tower frequency conversion control mechanism for frequency conversion control of the water flow rates of the external water inlet pipe and the external water outlet pipe, the external water inlet pipe and the external water outlet pipe are connected through the cooling tower frequency conversion control mechanism to form a cooling water circulation loop, an outlet water temperature sensor is installed on the outlet pipe of the cooling water channel, a regulating valve group is installed on the outlet pipe or the inlet pipe of the cooling water channel, and the regulating valve group and the outlet water temperature sensor are both connected to the control system signal transmission of the corresponding heating furnace.

[0006] Preferably, the regulating valve group is installed on the outlet pipe of the cooling water channel and is located outside the outlet water temperature sensor.

[0007] Preferably, the cooling tower frequency conversion control mechanism includes a cooling tower connected between an external water inlet pipeline and an external water outlet pipeline, a pressure sensor for measuring the water pressure at the water outlet end of the cooling tower, a water delivery pump and a frequency conversion controller for adjusting the water flow at the water inlet end of the cooling tower, the water inlet end of the cooling tower is connected to the external water outlet pipeline, the water outlet end is connected to the external water inlet pipeline, and the pressure sensor and the water delivery pump are respectively connected to the frequency conversion controller for signal transmission.

[0008] Preferably, the regulating valve group includes a main regulating valve installed on the outlet pipe of the cooling water channel, the main regulating valve is a normally open regulating valve, and the main regulating valve is connected to the control system signal transmission of the corresponding heating furnace.

[0009] Preferably, the regulating valve group further comprises a spare regulating valve connected in parallel with the main regulating valve, the spare regulating valve and the main regulating valve have different diameters, and the spare regulating valve is connected to the control system signal transmission of the corresponding heating furnace.

[0010] The beneficial effects of the utility model are:

[0011] The utility model discloses a heating furnace circulating water cooling system, which connects the cooling water channel of the heating furnace between the water inlet external pipeline and the water outlet external pipeline, so that the internal circulation of the heating furnace and the cooling water external circulation are interconnected and not independent of each other, thus simplifying the system structure, facilitating adjustment, control, maintenance and overhaul, and having a small space occupancy rate. A water outlet temperature sensor and a regulating valve group are installed on the cooling water channel of the heating furnace. When the heating furnace needs to cool down, the opening of the regulating valve group is controlled according to the water outlet temperature to stabilize the water temperature in the cooling water channel. When the heating furnace is not used, the regulating valve group is intermittently opened to avoid stagnant water from breeding anaerobic microorganisms and mineral deposition and scaling. The frequency conversion control mechanism of the cooling tower increases the output power as the number of openings of the regulating valve group increases to increase the water flow in the water inlet external pipeline and the water outlet cooling pipe, and reduces the output power as the number of openings of the regulating valve group decreases to reduce the water flow in the water inlet external pipeline and the water outlet external pipeline. The power consumption of the frequency conversion control mechanism of the cooling tower is reduced on the basis of ensuring effective cooling, thereby achieving energy saving and consumption reduction.

[0012] The regulating valve group is controlled by the control system of the heating furnace. It can achieve precise control according to the working stage and detection signal of the heating furnace. It can automatically increase the cooling water volume during the fast cooling cut-off, and can automatically execute the intermittent mode during the shutdown stage without manual switching operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the circulating water cooling system of the heating furnace in Example 1.

[0014] Figure 2 This is a schematic diagram of the connection of the cooling water channel, the regulating valve group, the outlet water temperature sensor and the control system of the corresponding heating furnace in Example 1.

[0015] Figure 3 This is a connection diagram of the cooling water channel, regulating valve group, outlet water temperature sensor and the control system of the corresponding heating furnace in Example 2. DETAILED DESCRIPTION

[0016] Combine the following Figures 1 to 3 The embodiments of the present utility model are described in detail. Embodiment 1

[0017] A heating furnace circulating water cooling system comprises a plurality of heating furnaces 2 having cooling water channels 1, external water inlet pipes 3 respectively connected to the water inlet pipes 11 of the cooling water channels 1, and external water outlet pipes 4 respectively connected to the water outlet pipes 12 of the cooling water channels 1, and is characterized in that it also comprises a cooling tower frequency conversion control mechanism 5 for frequency conversion control of the water flow rates of the external water inlet pipes 3 and the external water outlet pipes 4, the external water inlet pipes 3 and the external water outlet pipes 4 are connected via the cooling tower frequency conversion control mechanism to form a cooling water circulation loop, an outlet water temperature sensor 6 is installed on the outlet water pipe 12 of the cooling water channel 1, a regulating valve group 7 is installed on the outlet water pipe 12 or the inlet water pipe 11 of the cooling water channel 1, and the regulating valve group 7 and the outlet water temperature sensor 6 are both connected to the control system 21 of the corresponding heating furnace 2 for signal transmission.

[0018] The above-mentioned heating furnace circulating water cooling system connects the cooling water channel 1 of the heating furnace 2 between the water inlet external pipeline 3 and the water outlet external pipeline 4, so that the internal circulation of the heating furnace 1 and the cooling water external circulation are connected and not independent of each other, simplifying the system structure, facilitating adjustment control and maintenance and overhaul, and having a small space occupancy rate. The cooling water channel 1 of the heating furnace 2 is equipped with an outlet water temperature sensor 6 and a regulating valve group 7. When the heating furnace 1 needs to cool down, the opening of the regulating valve group 7 is controlled according to the outlet water temperature to stabilize the water temperature in the cooling water channel 1. When the heating furnace 2 is not in use, the regulating valve group 7 is intermittently opened to avoid stagnant water that breeds anaerobic microorganisms and mineral deposition and scaling. The cooling tower frequency conversion control mechanism 5 increases the output power as the number of openings of the regulating valve group 7 increases to increase the water flow in the water inlet external pipeline 3 and the water inlet cooling pipe 4, and reduces the output power as the number of openings of the regulating valve group 7 decreases to reduce the water flow in the water inlet external pipeline 3 and the water outlet external pipeline 4. The power consumption of the cooling tower frequency conversion control mechanism 5 is reduced on the basis of ensuring effective cooling, thereby achieving energy saving and consumption reduction. The regulating valve group 7 is controlled by the control system 21 of the heating furnace 2, and can achieve precise control according to the working stage and detection signal of the heating furnace. It can automatically increase the cooling water volume during the fast cooling cut-off, and can automatically execute the intermittent mode during the shutdown stage without manual switching operation.

[0019] The regulating valve group 7 is installed on the outlet pipe 12 of the cooling water channel 1 and is located outside the outlet water temperature sensor 6. The regulating valve group 7 is installed on the outlet pipe 12 to adjust the water flow in the outlet pipe 12, so as to avoid the cooling water channel 1 being unable to enter the cooling water due to the closure of the regulating valve group 7 when the regulating valve group 7 fails to adjust, and ensure that the cooling water can enter the cooling water channel 1 under any circumstances, thereby improving the safety of the heating furnace.

[0020] Among them, the cooling tower frequency conversion control mechanism 5 includes a cooling tower 51 connected between the water inlet external pipeline and the water outlet external pipeline 4, a pressure sensor 52 for measuring the water pressure at the water outlet end of the cooling tower 51, a water delivery pump 53 and a frequency conversion controller 54 for adjusting the water flow at the water inlet end of the cooling tower 5, the water inlet end of the cooling tower 51 is connected to the water outlet external pipeline 4, the water outlet end is connected to the water inlet external pipeline 3, the pressure sensor 52 and the water delivery pump 53 are respectively connected to the frequency conversion controller 54 for signal transmission, and the control system 21 of the heating furnace 2 is connected to the frequency conversion controller 54 for signal transmission. The cooling tower 51 stores cooling water and filters the circulating cooling water, effectively reducing the scaling rate in the entire cooling water circulation loop. The pressure sensor 52 sends the water pressure information at the outlet of the cooling tower 51 to the frequency conversion controller 54. The frequency conversion controller 54 adjusts the frequency of the water delivery pump 53 according to the water pressure information received from the pressure sensor 52. When the number of openings of the regulating valve group 7 is large and the water pressure information collected by the pressure sensor is lower than the set water pressure value, the frequency conversion controller 54 controls the water delivery pump to increase the output frequency, increase the water flow in the water inlet external pipeline 3 and the water outlet external pipeline 4, and speed up the cooling efficiency. When the number of openings of the regulating valve assembly 7 is small, the water pressure information collected by the pressure sensor is higher than the set water pressure value. When the water pressure value is constant, the frequency conversion controller 54 controls the water delivery pump to reduce the output frequency, thereby reducing the water flow in the water inlet external pipeline 3 and the water outlet external pipeline 4. When the water delivery pump runs at a low output frequency for a long time, the frequency conversion controller 54 will control the water delivery pump 53 to close, so that the frequency conversion controller 54 increases the output power of the water delivery pump 53 as the number of openings of the regulating valve group 7 increases, thereby increasing the water flow in the water inlet external pipeline 3 and the water outlet cooling pipe 4, and reduces the output power of the water delivery pump 53 as the number of openings of the regulating valve group 7 decreases, thereby reducing the water flow in the water inlet external pipeline and the water outlet external pipeline 4. On the basis of ensuring effective cooling, the power consumption of the cooling tower frequency conversion control mechanism is reduced, thereby achieving energy saving and consumption reduction.

[0021] The regulating valve group 7 includes a main regulating valve 71 installed on the outlet pipe 12 of the cooling water channel 1. The main regulating valve 71 is a normally open regulating valve. The main regulating valve 71 is connected to the control system signal 21 of the corresponding heating furnace 2. The main regulating valve 71 regulates the water flow of the outlet pipe 12, that is, regulates the outlet water flow of the cooling water channel 1, thereby regulating the water flow in the cooling water channel 1. The normally open main regulating valve 71 can avoid the outlet pipe 12 from being cut off when the main regulating valve 71 is closed, ensuring that the cooling water channel 1 can maintain circulation and improving the cooling safety of the heating furnace 1. Embodiment 2

[0022] like Figure 3 As shown, the difference from the first embodiment is that the regulating valve group 7 further includes a standby regulating valve 72 connected in parallel with the main regulating valve 71, the standby regulating valve 72 and the main regulating valve 71 have different diameters, and the standby regulating valve 71 is connected to the control system 21 of the corresponding heating furnace 2 for signal transmission. The standby regulating valve 72 can be a normally closed or normally open regulating valve, and the standby regulating valve 72 and the main regulating valve 71 are respectively controlled by the control system 21 of the heating furnace 2. The standby regulating valve 72 can be opened at the same time as the main regulating valve 71 to increase the water flow of the cooling water channel 1 according to the cooling demand, and can also be opened when the main regulating valve 71 is closed or cannot be opened normally, so as to ensure the circulation of the cooling water channel 1 and further improve the cooling safety of the heating furnace 1.

[0023] The above is a complete description of the technical solutions of the embodiments of the utility model in combination with the accompanying drawings. It should be noted that the described embodiments are only part of the embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

Claims

1. A heating furnace circulating water cooling system, comprising a plurality of heating furnaces with cooling water channels, water inlet external pipes respectively connected to the water inlet pipes of the cooling water channels, and water outlet external pipes respectively connected to the water outlet pipes of the cooling water channels, characterized in that: It also includes a cooling tower frequency conversion control mechanism for frequency conversion control of the water flow of the water inlet external pipeline and the water outlet external pipeline. The water inlet external pipeline and the water outlet external pipeline are connected through the cooling tower frequency conversion control mechanism to form a cooling water circulation loop. An outlet water temperature sensor is installed on the outlet pipe of the cooling water channel. A regulating valve group is installed on the outlet pipe or the inlet pipe of the cooling water channel. The regulating valve group and the outlet water temperature sensor are both connected to the control system signal transmission of the corresponding heating furnace.

2. The heating furnace circulating water cooling system according to claim 1 is characterized in that: The regulating valve group is installed on the outlet pipe of the cooling water channel and is located outside the outlet water temperature sensor.

3. The heating furnace circulating water cooling system according to claim 1 is characterized in that: The cooling tower frequency conversion control mechanism includes a cooling tower connected between an external water inlet pipeline and an external water outlet pipeline, a pressure sensor for measuring the water pressure at the water outlet end of the cooling tower, a water delivery pump and a frequency conversion controller for adjusting the water flow at the water inlet end of the cooling tower. The water inlet end of the cooling tower is connected to the external water outlet pipeline, and the water outlet end is connected to the external water inlet pipeline. The pressure sensor and the water delivery pump are respectively connected to the frequency conversion controller for signal transmission.

4. The heating furnace circulating water cooling system according to claim 3 is characterized in that: The regulating valve group comprises a main regulating valve installed on the outlet pipe of the cooling water channel. The main regulating valve is a normally open regulating valve, and the main regulating valve is connected with the control system signal transmission of the corresponding heating furnace.

5. The heating furnace circulating water cooling system according to claim 4 is characterized in that: The regulating valve group also includes a spare regulating valve connected in parallel with the main regulating valve. The spare regulating valve and the main regulating valve have different diameters. The spare regulating valve is connected to the control system signal transmission of the corresponding heating furnace.

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