Control device of normal-pressure drying energy-saving hot blast stove

Abstract

The utility model relates to a normal pressure drying energy-saving hot blast stove control device which comprises a coal mill, a coal feeder, a screw feeder, an induced draft fan, a hot blast valve, a cold blast valve and a PLC, the coal mill, the coal feeder, the screw feeder, the induced draft fan, the hot blast valve and the cold blast valve are all connected with the PLC, the PLC comprises a CPU module, a second communication module and a wireless communication module, the CPU module is connected with the second communication module through a communication port, and the wireless communication module is connected with the communication port. The wireless communication module is connected with the second communication module through a port, the wireless communication module is wirelessly connected with a cloud server, the cloud server stores data information to a cloud management center through communication, and the cloud management center is connected with mobile equipment through communication. The utility model has the advantages that the touch screen is connected with the CPU module, and the touch screen is provided with the on / off button, so that an operator can realize the on / off operation of the equipment by operating the on / off button, the operator does not need to go to the site to pass through an operation box beside the machine, the single-start and single-stop operation is realized, the transformation cost is low, and the operation is simple.

Description

Technical Field

[0001] The utility model relates to the technical field of hot air furnaces, in particular to a control device for a normal pressure drying energy-saving hot air furnace. Background Art

[0002] After the grain is collected in the granary, it is necessary to dry the grain. A hot air furnace is used to connect the granary to dry the grain. Currently, the hot air furnace equipment in most granaries relies on operators to manually operate the machine through the operation box next to the machine to achieve single start and stop operation. All instruments are local instruments. Operators record equipment operation data through manual inspections. The recorded data is often untrue and delayed, posing a safety hazard. Summary of the invention

[0003] The utility model aims to provide a control device for an energy-saving hot air furnace with normal pressure drying, which does not require manual operation of a machine-side operation box to start and stop the equipment, does not require manual inspection and data recording, and is simple to operate, safe and reliable.

[0004] To achieve the above purpose, the utility model is implemented through the following technical solutions:

[0005] A control device for a normal pressure drying energy-saving hot air furnace comprises a coal mill, a coal feeder, a spiral feeder, an induced draft fan, a hot air valve, a cold air valve and a PLC. The coal mill, the coal feeder, the spiral feeder, the induced draft fan, the hot air valve and the cold air valve are all connected to the PLC. The PLC comprises a CPU module, a second communication module and a wireless communication module. The CPU module and the second communication module are connected via a communication port, the wireless communication module and the second communication module are connected via a port, the wireless communication module is wirelessly connected to a cloud server, the cloud server saves data information to a cloud management center via communication, and the cloud management center is connected to a mobile device via communication.

[0006] It also includes temperature sensor 1, temperature sensor 2, and temperature sensor 3. Temperature sensor 1, temperature sensor 2, and temperature sensor 3 are connected to PLC. Both the hot air valve and the cold air valve use regulating valves. Temperature sensor 1 is set on the inlet pipe of the intermediate warehouse, temperature sensor 2 is set on the outlet pipe of the hot air valve, and temperature sensor 3 is set in the furnace of the hot air furnace.

[0007] It also includes main loop 1, main loop 2, control loop 1 and control loop 2. The main loop 1 is connected to the control loop 1, the main loop 2 is connected to the control loop 2, and both the control loop 1 and the control loop 2 are connected to the PLC.

[0008] The main circuit 1 includes an overheating relay, a main contact of contactor KM1, and a circuit breaker 1 which are connected to the motor 1 in sequence. The control circuit 1 includes a normally open contact 1 of the PLC and a coil of the overheating relay which are connected in series. The coil of the overheating relay is connected in parallel with the coil of the contactor KM1, and the normally closed auxiliary contact of the overheating relay is connected in series with the coil of the contactor KM1.

[0009] The main circuit 2 includes a frequency converter, a main contact of the contactor KM2, and a circuit breaker 2 which are sequentially connected to the motor 2, and the control circuit 2 includes a branch a, a branch b, and a branch c which are connected in parallel;

[0010] Branch a includes the normally closed contact of button SB1, the normally open contact of button SB2, and the coil of contactor KM2 connected in series, and the normally open auxiliary contact of contactor KM2 is connected in parallel with the normally open contact of button SB2;

[0011] Branch b includes the normally open contact 2 of the PLC, the coil of relay KA1, and the normally closed contact of relay KA2 connected in series;

[0012] Branch c includes the inverter alarm normally open contact and the coil of relay KA2 connected in series, and the normally open contact of relay KA1 is connected to the inverter DI start port.

[0013] Motor 1 includes coal mill motor and screw feeder motor.

[0014] Motor 2 includes a coal feeder motor and an induced draft fan motor.

[0015] The PLC also includes a power module, a communication module 1, a digital output module, an analog input module, and an analog output module. The power module is used to provide working power. Temperature sensor 1, temperature sensor 2, and temperature sensor 3 are connected to the analog input module through ports. The normally open contact 1 and the normally open contact 2 of the PLC are respectively connected to the digital output module through ports. The analog input AI port, hot air valve, and cold air valve of the frequency converter are respectively connected to the analog output module through ports. Communication module 1 is used to connect to a remote engineering station.

[0016] Communication module 1, digital output module, analog input module, and analog output module are connected through ports.

[0017] It also includes a coal bunker and an intermediate bunker. The outlet of the coal bunker is connected to the screw feeder and the intermediate bunker through pipelines in sequence. The intermediate bunker is used to deliver coal to the coal feeder, and the coal mill is used to deliver coal to the hot blast furnace. The induced draft fan is connected to the hot blast furnace through an induced draft duct, and the cold air valve is connected to the air duct. The other end of the cold air valve is connected to the coal mill for providing oxygen to the hot blast furnace. The exhaust gas at the tail of the hot blast furnace is connected to the hot air valve through a pipeline, and the outlet of the hot air valve is connected to the coal feeder through a pipeline.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] 1. The touch screen is connected to the CPU module. An on / off button is set on the touch screen. The operator can turn the equipment on / off by operating the on / off button. There is no need for the operator to go to the site to operate the machine side operation box. The equipment can be started and stopped by a single operator. The modification cost is low, the operation is simple, and it is easy to implement.

[0020] 2. Operators establish a network connection with the wireless communication module through mobile phones or PCs to monitor the data information of the operating status of coal mills, coal feeders, screw conveyors, induced draft fans, hot air valves, and cold air valves in real time, receive data information sent by the cloud management center, and start and stop equipment;

[0021] 3. Operators can check the operating status of the detection sensor at any time through the touch screen. If the sensor exceeds the set value, an alarm will be given. There is no need for manual inspection and data recording, which improves the safety of the hot air furnace.

[0022] 4. The coal feeder is driven by a frequency converter. The operator can adjust the coal feeding amount by pressing the buttons on the touch screen. The induced draft fan is driven by a frequency converter. The operator can adjust the speed of the induced draft fan by pressing the buttons on the touch screen. The operating status of the equipment can be observed at any time. The operation is simple, intuitive and convenient for maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a PLC structure diagram of the atmospheric pressure drying energy-saving hot air furnace control device.

[0024] Figure 2 It is a schematic diagram of the principle of the PLC analog module of the atmospheric pressure drying energy-saving hot air furnace control device.

[0025] Figure 3 It is a schematic diagram of the principle of the PLC digital module of the atmospheric pressure drying energy-saving hot air furnace control device.

[0026] Figure 4 It is a schematic diagram of the motor principle of the normal pressure drying energy-saving hot air furnace control device.

[0027] Figure 5 It is the original schematic diagram of motor 2 of the normal pressure drying energy-saving hot air furnace control device.

[0028] Figure 6 It is a structural schematic diagram of a normal pressure drying energy-saving hot air furnace control device.

[0029] In the figure: 1-induced draft fan 3-coal feeder 1 4-coal feeder 2 5-coal mill 1 6-coal mill 2 7-screw feeder 1 8-screw feeder 2 101-hot air valve 1 102-hot air valve 2 103-cold air valve 1 104-cold air valve 2 105-fan damper regulating valve 1 106-fan damper regulating valve 2 201-coal mill inlet temperature sensor 1 202-coal mill inlet temperature sensor 2 203-hot air temperature sensor 1 204-hot air temperature sensor 2 205-coal mill outlet temperature sensor 1 206-coal mill outlet temperature sensor 2 207-furnace temperature 208-material level sensor 1 209-material level sensor 2 DETAILED DESCRIPTION

[0030] The present invention is described in detail below in conjunction with the accompanying drawings of the specification, but it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0031] The following examples are implemented based on the technical solution of the utility model, and provide detailed implementation methods and specific operation processes, but the protection scope of the utility model is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.

[0032] [Example 1]

[0033] See Figure 1 A control device for a normal pressure drying energy-saving hot air furnace comprises a PLC, an induced draft fan 1, a fan damper 1, a fan damper 2, and a device 2. The device 2 comprises a pulverizing device 2, an air regulating device 2, and a temperature measuring device 2. The pulverizing device 2 comprises a coal mill 2 6, a coal feeder 2 4, and a screw feeder 2 8. The air regulating device 2 comprises a hot air valve 2 102 and a cold air valve 2 104. The temperature measuring device 2 comprises a pulverizing coal inlet temperature sensor 202, a pulverizing coal outlet temperature sensor 206, and a hot air temperature sensor 204. The hot air valve 2 102, the cold air valve 2 104, the fan damper 1, and the fan damper 2 all adopt regulating valves. The pulverizing coal outlet temperature sensor 206 is arranged at the outlet of the coal mill. The outlet of the coal bunker 2 is connected to the screw feeder 2 in sequence. 8. The middle bin 2 is connected by a pipeline. The middle bin 2 is used to deliver coal to the coal feeder 2 4. The coal mill 2 6 is used to deliver coal to the hot blast furnace. The induced draft fan 1 is connected to the hot blast furnace through an induced draft duct. The cold air valve 2 104 is connected to the air duct. The other end of the cold air valve 2 104 is connected to the coal mill 2 6 to provide oxygen to the hot blast furnace. The exhaust gas at the tail of the hot blast furnace is connected to the hot air valve 2 102 through a pipeline. The outlet of the hot air valve 2 102 is connected to the coal feeder 2 4 through a pipeline. A coal mill inlet temperature sensor 202 is provided on the inlet pipeline of the middle bin 2, a hot air temperature sensor 2 is provided on the outlet pipeline of the hot air valve 2 102, a furnace temperature sensor 207 is provided in the furnace of the hot blast furnace, and a material level sensor 209 is provided in the middle bin 2.

[0034] The control device for the atmospheric drying energy-saving hot air furnace also includes device 1, which includes a pulverizing device 1, an air regulating device 1, and a temperature measuring device 1. The pulverizing device 1 includes a coal mill 5, a coal feeder 3, and a screw feeder 7. The air regulating device 1 includes a hot air valve 101 and a cold air valve 103. The temperature measuring device 1 includes a coal mill inlet temperature sensor 201, a coal mill outlet temperature sensor 205, and a hot air temperature sensor 203. The structures of device 1 and device 2 are the same and they are mutually standby. Figure 1 .

[0035] The existing hot blast furnace's coal mill, screw feeder, and induced draft fan are operated by a machine-side control box. The start / stop operation can only be performed by operators on site. The coal feeder is controlled by a relay and the coal feeding amount cannot be adjusted. Figure 5 , Figure 6 After the transformation, the coal mill, screw feeder and induced draft fan are added with PLC, which is connected to the control circuit. The normally open contact 1 and the normally open contact 2 of the PLC are respectively connected to the coil of the contactor M1KM and the coil of the relay M3KA1. The control cabinet has less wiring, simple operation and easy implementation; the coal feeder is driven by a frequency converter. The main circuit 1 includes the overheating relay M1BJ, the main contact of the contactor M1KM and the circuit breaker M1QF connected to the motor 1 in sequence. The control circuit 1 includes the normally open contact 1 of the PLC and the coil of the overheating relay M1BJ connected in series. The coil of the overheating relay M1BJ is connected in parallel with the coil of the contactor M1KM, and the normally closed auxiliary contact of the overheating relay M1BJ is connected in series with the coil of the contactor M1KM. The main circuit 2 includes the frequency converter, the main contact of the contactor M3KM, and the circuit breaker M3QF connected in sequence with the motor 2. The control circuit 2 includes branches a, b, and c connected in parallel. Branch a includes the normally closed contact of the button M3SB1, the normally open contact of the button M3SB2, and the coil of the contactor M3KM connected in series. The normally open auxiliary contact of the contactor M3KM is connected in parallel with the normally open contact of the button M3SB2. Branch b includes the normally open contact 2 of the PLC connected in series, the coil of the relay M3KA1, and the normally closed contact of the relay M3KA2. Branch c includes the normally open contact of the frequency converter alarm and the coil of the relay M3KA2 connected in series. The normally open contact of the relay M3KA1 is connected to the start port S1 and COM of the frequency converter DI. Motor 1 includes the coal mill motor and the screw feeder motor. Motor 2 includes the coal feeder motor and the induced draft fan 1 motor.

[0036] See Figure 2 to Figure 4The PLC includes a CPU module, a communication module 2, a wireless communication module, a power module, a communication module 1, a digital output module, a digital input module, an analog input module, and an analog output module. The CPU module is connected through a touch screen through a communication port. The touch screen is arranged in a central control room or an operation room. The power module is used to provide a working power supply. The detection sensors are connected to the analog input module through a port. The analog output AO end of the corresponding frequency converter is connected to the analog input port through a port, which is used for operators to check the running speed of the equipment. The normally open contact 1 and the normally open contact 2 of the PLC are respectively connected to the digital output module through a port. The analog input AI1 port of the frequency converter, the hot air valve 2 102, and the cold air valve 2 104 are respectively connected to the analog output module through a port. The CPU module transmits data information to the engineer station in the central control room through the communication module 1. The normally open auxiliary contact of the contactor M1KM of the corresponding equipment and the normally open auxiliary contact of the contactor M3KM The normally open auxiliary contact of the overheating relay M1BJ, the normally open contact of the relay M3KA1, and the normally open contact of the relay M3KA2 are respectively connected to the digital input module through the port, so that the operator can view the operating status of the equipment through the touch screen; the PLC includes a CPU module, a communication module 2, and a wireless communication module. The CPU module and the communication module 2 are connected through the communication port, the wireless communication module and the communication module 2 are connected through the port, the wireless communication module is wirelessly connected to the cloud server, the cloud server saves the data information to the cloud management center through communication, and the cloud management center connects to the mobile device through communication; the wireless communication module is any one of the 5G communication module, 4G communication module, Bluetooth module, WiFi module, GSM module, CDMA module, CDMA module, WCDMA module, TD-SCDMA module, Zigbee module and LoRa module, or any combination of several of them. The operator establishes a network connection with the wireless communication module through a mobile phone or PC.

[0037] Working process:

[0038] 1) Flour milling

[0039] The coal blocks are transported from the coal bunker to the coal feeder through a screw conveyor. The coal feeder uses a frequency converter as a control device and controls the coal delivery amount through frequency modulation. The coal feeder delivers the coal to the pulverizer, and the fine coal powder ground by the pulverizer is directly sprayed into the furnace by the burner.

[0040] 2) Combustion air regulation

[0041] The flue gas generated by burning pulverized coal in the hot blast furnace is extracted and discharged by the induced draft fan. The operator adjusts the opening of the cold air valve and the fan damper regulating valve through the touch screen according to the changes in the furnace temperature.

[0042] The touch screen of the utility model is connected with the CPU module, and an on / off button is arranged on the touch screen. The operating personnel realizes the on / off operation of the equipment by operating the on / off button, and there is no need for the operating personnel to go to the site through the operation box beside the machine. The single start and single stop operation has low transformation cost, simple operation and easy implementation. The operating personnel establish a network connection with the wireless communication module through a mobile phone or a PC, and monitor the data information of the operating status of the coal mill, the coal feeder, the screw conveyor, the induced draft fan, the hot air valve and the cold air valve in real time, receive the data information sent by the cloud management center, and start and stop the equipment. The operating personnel can check the operating status of the detection sensor at any time through the touch screen. If the sensor exceeds the set value, an alarm prompts, and there is no need for manual inspection and data recording, thereby improving the safety of the hot blast furnace.

Claims

1. A control device for an atmospheric pressure drying energy-saving hot air furnace, characterized in that: It includes a coal mill, a coal feeder, a screw feeder, an induced draft fan, a hot air valve, a cold air valve, and a PLC. The coal mill, the coal feeder, the screw feeder, the induced draft fan, the hot air valve, and the cold air valve are all connected to the PLC. The PLC includes a CPU module, a communication module 2, and a wireless communication module. The CPU module and the communication module 2 are connected through a communication port, the wireless communication module and the communication module 2 are connected through a port, the wireless communication module is wirelessly connected to the cloud server, the cloud server saves data information to the cloud management center through communication, and the cloud management center connects to mobile devices through communication.

2. The control device for an energy-saving hot air furnace for drying at normal pressure according to claim 1, characterized in that: It also includes temperature sensor 1, temperature sensor 2, and temperature sensor 3. Temperature sensor 1, temperature sensor 2, and temperature sensor 3 are connected to PLC. Both the hot air valve and the cold air valve use regulating valves. Temperature sensor 1 is set on the inlet pipe of the intermediate warehouse, temperature sensor 2 is set on the outlet pipe of the hot air valve, and temperature sensor 3 is set in the furnace of the hot air furnace.

3. The control device for an energy-saving hot air furnace for drying at normal pressure according to claim 2, characterized in that: It also includes main loop 1, main loop 2, control loop 1 and control loop 2. The main loop 1 is connected to the control loop 1, the main loop 2 is connected to the control loop 2, and both the control loop 1 and the control loop 2 are connected to the PLC.

4. The control device for an atmospheric pressure drying energy-saving hot air furnace according to claim 3, characterized in that: The main circuit 1 includes an overheating relay, a main contact of contactor KM1, and a circuit breaker 1 which are connected to the motor 1 in sequence; the control circuit 1 includes a normally open contact 1 of a PLC and a coil of an overheating relay which are connected in series; the coil of the overheating relay is connected in parallel with the coil of the contactor KM1; and the normally closed auxiliary contact of the overheating relay is connected in series with the coil of the contactor KM1.

5. The control device for an atmospheric drying energy-saving hot air furnace according to claim 3, characterized in that: The main circuit 2 includes a frequency converter, a main contact of the contactor KM2, and a circuit breaker 2 which are sequentially connected to the motor 2, and the control circuit 2 includes a branch a, a branch b, and a branch c which are connected in parallel; Branch a includes the normally closed contact of button SB1, the normally open contact of button SB2, and the coil of contactor KM2 connected in series, and the normally open auxiliary contact of contactor KM2 is connected in parallel with the normally open contact of button SB2; Branch b includes the normally open contact 2 of the PLC, the coil of relay KA1, and the normally closed contact of relay KA2 connected in series; Branch c includes the inverter alarm normally open contact and the coil of relay KA2 connected in series, and the normally open contact of relay KA1 is connected to the inverter DI start port.

6. The control device for an atmospheric pressure drying energy-saving hot air furnace according to claim 4, characterized in that: The motor 1 includes a coal mill motor and a screw feeder motor.

7. The control device for an energy-saving hot air furnace for drying at normal pressure according to claim 5, characterized in that: The motor 2 includes a coal feeder motor and an induced draft fan motor.

8. The control device for an energy-saving hot air furnace for drying at normal pressure according to claim 3, characterized in that: The PLC also includes a power module, a communication module 1, a digital output module, an analog input module, and an analog output module. The power module is used to provide working power. Temperature sensor 1, temperature sensor 2, and temperature sensor 3 are connected to the analog input module through a port. The normally open contact 1 of the PLC and the normally open contact 2 of the PLC are respectively connected to the digital output module through a port. The analog input AI port, hot air valve, and cold air valve of the frequency converter are respectively connected to the analog output module through a port. Communication module 1 is used to connect to a remote engineering station.

9. A control device for an energy-saving hot air furnace for drying at normal pressure according to claim 8, characterized in that: Communication module 1, digital output module, analog input module, and analog output module are connected through ports.

10. The control device for an atmospheric pressure drying energy-saving hot air furnace according to claim 1, characterized in that: It also includes a coal bunker and an intermediate bunker. The outlet of the coal bunker is connected to the screw feeder and the intermediate bunker through pipelines in sequence. The intermediate bunker is used to deliver coal to the coal feeder, and the coal mill is used to deliver coal to the hot blast furnace. The induced draft fan is connected to the hot blast furnace through an induced draft duct, and the cold air valve is connected to the air duct. The other end of the cold air valve is connected to the coal mill for providing oxygen to the hot blast furnace. The exhaust gas at the tail of the hot blast furnace is connected to the hot air valve through a pipeline, and the outlet of the hot air valve is connected to the coal feeder through a pipeline.

Images