Heating control system

Abstract

The utility model belongs to the technical field of heating control, and particularly relates to a heating control system. The utility model provides a hardware foundation of a heating control system, which has a good using effect. The utility model comprises a touch screen, a main controller, a temperature controller, a heating part and a temperature measuring element, and is characterized in that a detection signal input port of the temperature controller is connected with a detection signal output port of the temperature measuring element, and a detection signal input port of the main controller is connected with a high-temperature alarm signal output port of the temperature controller; a 485 communication port of the main controller is connected with a 485 communication port of the temperature controller, a control signal output port of the temperature controller is connected with a control signal input port of a control element for controlling the heating part to work, and a signal transmission port of the touch screen is connected with a signal transmission port of the main controller; and the input end of the control element is connected with a power supply through a controlled switch of the contactor and the circuit breaker in sequence.

Description

Technical Field

[0001] The utility model belongs to the technical field of heating control, and in particular relates to a heating control system. Background Art

[0002] The process gas temperature of the hot sleeve heating system of a nuclear power plant is as high as 150-550℃ during operation. Under normal conditions, all the main circuits of the hot sleeve heating system are in working condition. After the hot sleeve heating system runs to the corresponding working time, the main circuit switches to the backup circuit for control output, the main circuit is cut off, and the system stops working; after the backup circuit runs to the corresponding working time, the backup circuit switches to the main circuit for control output, the backup circuit is cut off, and the system stops working. Conventional heating control requires manual control and operation, and does not have automatic cut-off and fault alarm prompts, which affects the heating working state of the equipment and increases the workload of personnel; in special process conditions such as testing and debugging, the main and backup circuits must be put into operation at the same time to achieve the function of synchronous, uniform and rapid heating. Utility Model Content

[0003] The utility model aims at solving the above problems and provides a hardware basis for a heating control system with good use effect.

[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme, which includes a touch screen, a main controller, a temperature controller, a heating part and a temperature measuring element, and is characterized in that the detection signal input port of the temperature controller is connected to the detection signal output port of the temperature measuring element, the detection signal input port of the main controller is connected to the high temperature alarm signal output port of the temperature controller, the 485 communication port of the main controller is connected to the 485 communication port of the temperature controller, the control signal output port of the temperature controller is connected to the control signal input port of the control element for controlling the operation of the heating part, and the signal transmission port of the touch screen is connected to the signal transmission port of the main controller; the input end of the control element is connected to the power supply through the controlled switch of the contactor (KM11) and the circuit breaker (QF11) in sequence; the control signal input port of the contactor (KM11) is connected to the control signal output port of the main controller.

[0005] As a preferred solution, the heating part of the utility model adopts an armored mineral insulated heating cable.

[0006] As another preferred solution, the main controller of the utility model adopts PLC.

[0007] As another preferred solution, the control element of the utility model adopts a thyristor.

[0008] As another preferred solution, the temperature measuring element of the utility model adopts a thermocouple.

[0009] As another preferred solution, the temperature controller of the present invention adopts AI-518 temperature controller.

[0010] As another preferred solution, one end of the heating cable power supply end of the utility model is connected to one end of the MTC70A thyristor output end, and the other end of the heating cable power supply end is connected to the other end of the MTC70A thyristor output end through a current transmitter; the MTC70A thyristor input end is connected to the power supply through a fuse, a controlled switch of a contactor (KM11), and a circuit breaker (QF11) in sequence; the detection signal output port of the current transmitter (VA11) is connected to the detection signal input port of the IO module, the detection signal output port of the IO module is connected to the detection signal input port of the PLC, and the control signal input port of the contactor (KM11) is connected to the control signal output port of the PLC.

[0011] As another preferred solution, the control signal output port of the PLC described in the utility model is connected to the control signal input port of the intermediate relay (KA11), the first controlled switch of the intermediate relay (KA11) is connected to the operation selection indicator light (HL112), and the second controlled switch of the intermediate relay (KA11) is connected to the control end of the contactor (KM11).

[0012] As another preferred solution, the control signal output port of the PLC of the utility model is connected to an alarm indicator light (HL113).

[0013] As another preferred solution, the IO module of the present invention adopts a 3AE08 module.

[0014] As another preferred solution, the output ends of the circuit breaker (QF11) of the utility model are connected via a power supply indicator light (HL111).

[0015] As another preferred solution, the touch screen, power supply indicator light, operation selection indicator light (HL112) and circuit breaker control knob of the utility model are arranged on a control cabinet, and the main controller, control element, current transmitter (VA11) and temperature controller (TK11) are arranged in the control cabinet.

[0016] As another preferred solution, the bottom plate of the control cabinet described in the utility model is composed of four detachable plates, and a bottom bracket is arranged at the lower end of the bottom plate; the detachable plates are connected to the control cabinet body by screws.

[0017] As another preferred solution, the height of the base of the utility model is 200 mm.

[0018] As another preferred solution, the top plate of the control cabinet of the utility model is provided with wire inlet and outlet ports.

[0019] As another preferred embodiment, the front door of the control cabinet of the utility model adopts a double-layer door, and the rear door of the control cabinet adopts a double-door; the touch screen, power indicator light, operation selection indicator light and circuit breaker control knob are arranged on the inner door of the double door, and a transparent observation window is arranged on the outer door of the double door.

[0020] Secondly, the upper end of the control cabinet of the utility model is arranged on a lifting ring.

[0021] In addition, a heat dissipation fan is arranged at the upper rear part of the control cabinet of the utility model.

[0022] The utility model has beneficial effects.

[0023] In the specific setting process, multiple groups of temperature controller control circuits can be set, and main and standby circuits can be set. Each circuit corresponds to a temperature controller, a heating part, a temperature measuring element, a control element, and a contactor. The control signal input port of the contactor (KM11) of the utility model is connected to the control signal output port of the main controller, which can realize the timing and automatic switching of the main circuit and the standby circuit, and the time can be set through the touch screen.

[0024] The temperature controller of the utility model detects the temperature of the equipment through the temperature measuring element and communicates with the main controller. When the main circuit fails, the main controller automatically switches to the backup circuit, or when the backup circuit fails, it automatically switches to the main circuit, and gives a fault prompt and displays the fault problem through the touch screen.

[0025] The utility model facilitates the control of heating temperature through the cooperation of various components, has good heating effect and fast speed, and can realize heating control combination in various ways. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods. The protection scope of the utility model is not limited to the following descriptions.

[0027] Figure 1 , 2 This is the electrical schematic diagram of the main circuit of the utility model.

[0028] Figures 3 to 5 This is the electrical schematic diagram of the control circuit of the utility model.

[0029] Figure 6 This is the wiring diagram of the temperature controller of the utility model.

[0030] Figure 7 , 8 This is the PLC wiring diagram of the utility model.

[0031] Fig. 9 This is a terminal diagram of the utility model.

[0032] Fig.10 It is a layout diagram of the electrical components of the utility model in the control cabinet.

[0033] Fig.11 It is a front view of the control cabinet of the utility model.

[0034] Fig.12 It is a rear view of the control cabinet of the utility model.

[0035] Fig.13 It is a top view of the control cabinet of the utility model.

[0036] Fig.14 It is a bottom view of the control cabinet of the utility model.

[0037] Fig.15 It is a schematic diagram of the thermocouple arrangement structure of the utility model.

[0038] Fig.16 , 17 It is a schematic diagram of the structure of the pre-punched belt of the utility model.

[0039] Fig.18 This is a diagram of the use status of the pre-punched belt of the utility model.

[0040] Figures 10 to 18 Among them, 1 is an explosion-proof junction box, 2 is a thermocouple, 3 is a sleeve, 4 is a T-shaped connector, 5 is a protective tube, 6 is a hot end fixing block, 7 is an equipment surface, 8 is a hook-shaped component, 9 is a long strip, 10 is a heating cable, 11 is a base, 12 is a control cabinet, 13 is a front door, 14 is a transparent observation window, 15 is a touch screen, 16 is a lifting ring, 17 is a cooling fan, 18 is a rear door, 19 is a line inlet and outlet, and 20 is a detachable plate. DETAILED DESCRIPTION

[0041] As shown in the figure, the utility model includes a touch screen, a main controller, a temperature controller, a heating part and a temperature measuring element. The detection signal input port of the temperature controller is connected to the detection signal output port of the temperature measuring element, the detection signal input port of the main controller is connected to the high temperature alarm signal output port of the temperature controller, the 485 communication port of the main controller is connected to the 485 communication port of the temperature controller, the control signal output port of the temperature controller is connected to the control signal input port of the control element that controls the operation of the heating part, and the signal transmission port of the touch screen is connected to the signal transmission port of the main controller.

[0042] The 485 communication port of the main controller is connected to the 485 communication port of the temperature controller, and the measured temperature value, set temperature value, output ratio, control start and stop, program segment setting and other information on the temperature controller can be interactively transmitted through the MODBUS-RTU protocol.

[0043] The heating part adopts an armored mineral insulated heating cable. The outer sleeve wall thickness of the armored mineral insulated heating cable is 12% of the outer diameter of the armored mineral insulated heating cable, which effectively prolongs the service life of the heating cable in a long-term high temperature environment.

[0044] The main controller adopts PLC.

[0045] The control element is a thyristor.

[0046] The temperature measuring element is a thermocouple.

[0047] The temperature controller adopts AI-518 temperature controller.

[0048] One end of the heating cable power supply end is connected to one end of the MTC70A thyristor output end, and the other end of the heating cable power supply end is connected to the other end of the MTC70A thyristor output end through a current transmitter; the MTC70A thyristor input end is connected to the power supply through a fuse, a controlled switch of a contactor (KM11), and a circuit breaker (QF11) in sequence; the detection signal output port of the current transmitter (VA11) is connected to the detection signal input port of the IO module, the detection signal output port of the IO module is connected to the detection signal input port of the PLC, and the control signal input port of the contactor (KM11) is connected to the control signal output port of the PLC. The PLC controls whether to supply power to the heating cable through the contactor (KM11).

[0049] The detection signal output port of the current transmitter (VA11) is connected to the detection signal input port of the IO module. After the temperature rise is started, the measured temperature is lower than the set temperature, and the temperature controller has an output proportional value, and the working current of the heating cable is collected to determine whether the heating cable is disconnected and alarmed.

[0050] The PLC and IO modules are installed and connected in a way designed by Siemens Electric. They are directly connected in parallel, that is, the IO module is an expansion module of the PLC.

[0051] The control signal output port of the PLC is connected to the control signal input port of the intermediate relay (KA11), the first controlled switch of the intermediate relay (KA11) is connected to the operation selection indicator light (HL112), and the second controlled switch of the intermediate relay (KA11) is connected to the control end of the contactor (KM11).

[0052] The control signal output port of the PLC is connected to the alarm indicator light (HL113).

[0053] It can provide high temperature alarm, circuit breaker trip alarm and disconnection alarm, and the touch screen will display the alarm information.

[0054] The IO module adopts 3AE08 module. The IO module converts the analog signal input by the current transmitter into a digital signal and sends it to the PLC.

[0055] The output ends of the circuit breaker (QF11) are connected via a power supply indicator light (HL111).

[0056] Multiple groups of temperature controller control loops can be set up, and main and standby loops can be set up. Each temperature controller control loop exchanges information with the PLC.

[0057] The touch screen can display the real-time temperature value and the real-time working current value. You can set the temperature value, high temperature alarm value, output ratio value, program segment value, first program segment target temperature, first program segment time, second program end target temperature, second program segment time, main and standby switching time, etc.

[0058] The touch screen can be used to set parameters in a concise and clear manner, including manual / automatic switching, start / stop control, time-sharing heating control, power status, operating status, alarm status, operating current, real-time temperature display, and simultaneous operation of the main circuit and backup circuit.

[0059] The touch screen, power indicator light, operation selection indicator light (HL112) and control knob of the circuit breaker are arranged on the control cabinet 12, and the main controller, control element, current transmitter (VA11) and temperature controller (TK11) are arranged in the control cabinet 12. Through this arrangement, the electrical components are clear, which is convenient for installation, commissioning and later maintenance, and the primary and secondary lines are isolated, and the interference of related signal processing such as signal acquisition is small.

[0060] The bottom plate of the control cabinet 12 is composed of four detachable plates 20, and a bottom bracket 11 is arranged at the lower end of the bottom plate; the detachable plates 20 are connected to the control cabinet 12 body by screws. According to the number of inlet and outlet lines and the front and back of the inlet and outlet lines, it is possible to flexibly adjust which detachable plate needs to be opened for wiring, and the unused ones can be left unopened, so that the inlet and outlet line structure of the bottom plate is retained to the greatest extent, the area occupied by the inlet and outlet cables is reduced, and the inlet and outlet ports 19 are convenient for blocking after completion, and the structure has high strength and is beautiful.

[0061] The height of the base 11 is 200 mm.

[0062] The top plate of the control cabinet 12 is provided with a wire inlet and outlet 19 .

[0063] The front door 13 of the control cabinet 12 is a double-layer door, and the rear door 18 of the control cabinet 12 is a double-door; the touch screen 15, the power supply indicator light, the operation selection indicator light (HL112) and the control knob of the circuit breaker are arranged on the inner door of the double-layer door, and a transparent observation window 14 is arranged on the outer door of the double-layer door. The front door 13 is a double-layer door to increase the sealing performance of the cabinet. Through the transparent observation window 14, it is convenient to observe the working status of the touch screen and the indicator light. When performing normal operations, only the outer door needs to be opened.

[0064] The upper end of the control cabinet 12 is arranged on a lifting ring 16 to facilitate the transportation of the control cabinet 12 .

[0065] A heat dissipation fan 17 is disposed at the upper rear portion of the control cabinet 12 .

[0066] The heating cable 10 can be arranged on the surface of the equipment through a pre-punched belt. The pre-punched belt can be welded on the surface of the equipment.

[0067] The temperature difference between the surface temperature of the heating cable 10 and the temperature measuring point (i.e., where the thermocouple is placed) is relatively low (the temperature measuring point is installed between two parallel heating cables 10, the installation interval of the heating cables 10 is 50 mm, and the temperature measuring point and the heating cables 10 are both close to the surface of the equipment), the temperature control is more accurate, and the surface temperature of the heating cable 10 can be reduced as a whole, thereby extending the service life.

[0068] The pre-punched belt comprises a bottom long strip 9, and a hook-shaped component 8 bent in the length direction of the pre-punched belt is arranged on the upper end surface of the long strip 9. There are multiple hook-shaped components 8, which are evenly distributed along the length direction of the pre-punched belt, and the bending directions of the hook-shaped components 8 are consistent.

[0069] The heating cable 10 can pass under the hook-shaped component 8, and then press down the hook-shaped component 8 to fix the heating cable 10. This installation method ensures that the armored mineral insulated heating cable 10 is close to the surface of the equipment to the greatest extent, does not cause hanging dry burning, and prolongs the service life of the heating cable 10.

[0070] The distance between the lower end of the horizontal side of the hook-shaped component 8 and the upper end of the long strip 9 is 6 mm, and the length of the horizontal side is 10 mm.

[0071] The pre-punched belt is made of stainless steel.

[0072] The thermocouple 2 is arranged in the casing 3, the upper end of the casing 3 is provided with an explosion-proof junction box 1, the lower end of the casing 3 is threadedly connected to the upper end of the protection tube 5, the lower end of the protection tube 5 is connected through a hot end fixing block 6 (the hot end fixing block 6 is arranged to prevent the measuring end of the thermocouple 2 from being separated from the equipment surface 7 due to equipment vibration, resulting in inaccurate temperature measurement), and the bottom of the hot end fixing block 6 is connected to the equipment surface 7; it has the advantage of convenient disassembly after a fault. When replacing the thermocouple 2, there is no need to shut down the machine and remove the insulation, and the thermocouple 2 can be replaced at any time when a fault occurs.

[0073] The lower end of the sleeve 3 is provided with a T-shaped connector, and a T-shaped hole is provided in the middle of the T-shaped connector. The lower end of the sleeve 3 is inserted into the large hole of the T-shaped hole, and the outer wall of the lower end of the sleeve 3 is connected with the side wall of the large hole of the T-shaped hole. The inner diameter of the sleeve 3 is larger than the small hole of the T-shaped hole. The lower part of the sleeve 3 is welded to the upper end surface of the T-shaped connector. The outer wall of the small end of the T-shaped connector has an external thread, and the inner wall of the upper end of the protective tube 5 has an internal thread.

[0074] The hot end fixing block 6 has a vertical through hole in the middle, the upper end of the vertical through hole is a trumpet-shaped hole with a larger upper part and a smaller lower part (convenient for inserting when replacing the thermocouple 2), and the aperture of the vertical through hole below the trumpet-shaped hole is the same as the aperture of the lower end of the trumpet-shaped hole.

[0075] The inner wall of the lower end of the protection tube 5 is concave outward, the side wall of the concave part is connected to the outer wall of the hot end fixing block 6, and the upper end surface of the concave part is connected to the upper end surface of the hot end fixing block 6; the lower end of the protection tube 5 is higher than the bottom of the hot end fixing block 6, the outer wall of the bottom of the hot end fixing block 6 is welded to the surface of the tank body, and the lower end surface of the protection tube 5 is welded to the outer wall of the hot end fixing block 6.

[0076] like Figure 7 As shown, taking the 1# main circuit as an example, other circuits are similar. SD11, OF11 and QF11 correspond to each other. SD11 is the trip alarm auxiliary contact of the circuit breaker QF11. When the circuit load, i.e., the outlet of the electric heating cable, leaks electricity, the circuit breaker trips and sends a signal to the PLC. OF11 is the working status auxiliary contact of the circuit breaker QF11. Whether the circuit breaker QF11 is closed or opened, OF11 will send a signal to the PLC to determine the current circuit breaker status. SD11, OF11 and QF11 are physically installed together and operate in linkage through mechanical movement. When the main circuit detects that the temperature is too high, the circuit breaker trips or the heating cable is broken, the alarm indicator HL113 lights up.

[0077] It can be understood that the above specific description of the utility model is only used to illustrate the utility model and is not limited to the technical solution described in the embodiments of the utility model. Ordinary technicians in the field should understand that the utility model can still be modified or replaced by equivalents to achieve the same technical effect; as long as the use requirements are met, they are within the protection scope of the utility model.

Claims

1. A heating control system, comprising a touch screen, a main controller, a temperature controller, a heating part and a temperature measuring element, characterized in that The detection signal input port of the temperature controller is connected to the detection signal output port of the temperature measuring element, the detection signal input port of the main controller is connected to the high temperature alarm signal output port of the temperature controller, the 485 communication port of the main controller is connected to the 485 communication port of the temperature controller, the control signal output port of the temperature controller is connected to the control signal input port of the control element that controls the operation of the heating part, and the signal transmission port of the touch screen is connected to the signal transmission port of the main controller; the input end of the control element is connected to the power supply through the controlled switch and circuit breaker of the contactor in sequence; the control signal input port of the contactor is connected to the control signal output port of the main controller.

2. A heating control system according to claim 1, characterized in that The heating part adopts armored mineral insulated heating cable.

3. A heating control system according to claim 2, characterized in that The main controller adopts PLC.

4. A heating control system according to claim 1, characterized in that The control element is a thyristor.

5. A heating control system according to claim 1, characterized in that The temperature measuring element is a thermocouple.

6. A heating control system according to claim 3, characterized in that One end of the heating cable power supply end is connected to one end of the MTC70A thyristor output end, and the other end of the heating cable power supply end is connected to the other end of the MTC70A thyristor output end through a current transmitter; The MTC70A thyristor input end is connected to the power supply through the fuse, the controlled switch of the contactor, and the circuit breaker in sequence; the detection signal output port of the current transmitter is connected to the detection signal input port of the IO module, the detection signal output port of the IO module is connected to the detection signal input port of the PLC, and the control signal input port of the contactor is connected to the control signal output port of the PLC; the control signal output port of the PLC is connected to the control signal input port of the intermediate relay, the first controlled switch of the intermediate relay is connected to the operation selection indicator light, and the second controlled switch of the intermediate relay is connected to the control end of the contactor.

7. A heating control system according to claim 6, characterized in that The control signal output port of the PLC is connected to the alarm indicator light; the output ends of the circuit breakers are connected through power supply indicator lights.

8. A heating control system according to claim 7, characterized in that The touch screen, power supply indicator light, operation selection indicator light and control knob of the circuit breaker are arranged on the control cabinet, and the main controller, control element, current transmitter and temperature controller are arranged in the control cabinet.

9. A heating control system according to claim 8, characterized in that The bottom plate of the control cabinet is composed of four detachable plates, and a bottom bracket is arranged at the lower end of the bottom plate; the detachable plates are connected to the control cabinet body by screws.

10. A heating control system according to claim 8, characterized in that The front door of the control cabinet is a double-layer door, and the rear door of the control cabinet is a double-door; the touch screen, power supply indicator light, operation selection indicator light and circuit breaker control knob are arranged on the inner door of the double-layer door, and a transparent observation window is arranged on the outer door of the double-layer door.

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