Safety interlocking intelligent protection alarm device for hot blast stove

Abstract

The utility model discloses a hot -blast stove safety interlock intelligent protection alarm device can realize the multi -parameter monitoring of hot -blast stove operation, intelligent alarm and safety interlock protection. The device contains controller, a plurality of temperature sensor, smoke transducer, audible -visual alarm unit, actuating mechanism interface and man -machine interaction module. Temperature sensor can monitor hearth, air duct and wellhead mixed wind temperature, and smoke transducer detects air duct smoke. Audible -visual alarm unit can send corresponding audible -visual alarm according to different fault types. The device has two states of automatic control and manual control, when automatic control, hearth overtemperature or air duct smoke reaches the set condition and will automatically program shutdown, when manual control, only display alarm, and do not automatically shut down. The alarm button can eliminate the alarm sound, but the warning light continues to flash until the fault is removed. The device can effectively guarantee the safe operation of hot -blast stove, reduces the accident.

Description

Technical Field

[0001] This utility model relates to the field of hot blast stove safety control technology, specifically to a hot blast stove safety interlock intelligent protection alarm device. Background Technology

[0002] Existing hot blast stove safety protection devices mostly rely on single temperature threshold alarms, lacking intelligent analysis of temperature change trends. Furthermore, the alarm methods are limited to simple beeping alerts, making it difficult to distinguish between different fault types. Regarding shutdown control, existing devices primarily use direct forced shutdown without tiered delayed shutdown procedures, making them susceptible to damage to the furnace or flue pipes due to excessive thermal stress caused by sudden temperature drops. Simultaneously, existing devices have low sensitivity in detecting blast furnace smoke, easily susceptible to false alarms or missed alarms due to environmental interference, and cannot remotely monitor the temperature of the mixed air at the wellhead, making it difficult to ensure stable wellhead temperature. In addition, the automatic / manual control switching function of existing devices is incomplete; critical alarm information is often lost in manual mode, preventing boiler operators from timely monitoring of equipment status. These deficiencies can all potentially lead to hot blast stove safety accidents. Utility Model Content

[0003] The present invention aims to solve the above-mentioned technical problems by providing a smart protection alarm device for safety interlocking of hot blast stoves.

[0004] To solve the above-mentioned technical problems, the technical solution provided by this utility model is: a hot blast stove safety interlock intelligent protection alarm device, comprising:

[0005] The controller has a built-in programmable logic module and memory unit;

[0006] Furnace temperature sensor, connected to the controller, with a measurement range of 0℃–1300℃;

[0007] The air duct temperature sensor is connected to the controller and has a measurement range of -199℃ to 650℃.

[0008] The ventilation duct smoke sensor includes a high-temperature smoke detector and a smoke signal amplifier, with a heat resistance temperature ≥300℃ and a bending radius ≥35mm;

[0009] Wellhead mixed air temperature sensor, connected to the controller, measuring range -20℃–50℃;

[0010] The audible and visual alarm unit is connected to the controller and includes a speaker and multi-color LED indicator lights;

[0011] The actuator interface is electrically connected to the control terminals of the blower, grate, circulating fan, induced draft fan, and forced draft fan.

[0012] The human-machine interaction module includes a power switch, an automatic / manual control switch, an alarm suppression button, and a temperature setting interface.

[0013] Furthermore, the mounting structure of the high-temperature smoke detector includes: a 90mm×22mm rectangular hole at the outlet of the air duct; and Φ8.6mm mounting holes at the four corners for M10 fastening bolts.

[0014] The advantages of this utility model compared with the prior art are as follows:

[0015] This device effectively addresses the shortcomings of existing technologies through multi-dimensional monitoring and intelligent control: it employs multi-sensor collaborative monitoring combined with differentiated audible and visual alarms (distinguishing between ambulance, siren, and fire truck sounds) to solve the problem of single alarms; it designs a tiered delayed shutdown procedure to avoid equipment damage caused by forced shutdown and optimize the rationality of shutdown; it is equipped with a high-precision smoke detection module to reduce false alarms and missed alarms and improve the reliability of smoke detection; it supports remote monitoring of mixed air at the wellhead to ensure temperature stability; and it combines automatic / manual control modes, taking into account both automated protection and flexible manual operation, comprehensively improving the safety and controllability of hot blast stove operation. Attached Figure Description

[0016] Figure 1 This is the alarm wiring diagram for the intelligent safety interlock alarm device for hot blast stove of this utility model.

[0017] Figure 2 This is a schematic diagram of the human-machine interaction module of the intelligent protection alarm device for safety interlocking of hot blast stove according to this utility model.

[0018] Figure 3 This is a control diagram of the intelligent protection alarm device for safety interlocking of hot blast stove according to this utility model.

[0019] Figure 4 This is a diagram of the hot blast stove shutdown procedure for the intelligent protection alarm device with safety interlock of the hot blast stove according to this utility model.

[0020] Figure 5 This is an installation diagram of the smoke sensor in the air duct of the hot air furnace safety interlock intelligent protection alarm device of this utility model. Detailed Implementation

[0021] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly, for example, it can be a fixed connection, a detachable connection, or an integral connection; for those skilled in the art, the specific meaning of the above term in this utility model can be understood according to the specific circumstances.

[0023] 0. Working principle of this utility model:

[0024] The hot blast stove safety interlock intelligent protection alarm device uses controller 1 as its core hub, constructing a complete system encompassing temperature monitoring, smoke detection, alarm response, execution control, and human-machine interaction. Each functional module is electrically connected to controller 1 to achieve signal transmission and command interaction. The specific signal flow logic is as follows:

[0025] 1. Sensor Data Acquisition: Furnace temperature sensor 2, ventilation duct temperature sensor 3, and wellhead mixed air temperature sensor 5 sense the temperature at their respective locations in real time, converting the physical temperature signals into electrical signals, which are then transmitted to controller 1 via cables. The high-temperature smoke detector of ventilation duct smoke sensor 4 captures smoke information, which is processed by a smoke signal amplifier into a recognizable electrical signal, and also transmitted to controller 1. For example, furnace temperature sensor 2, based on the principle of thermistor or thermocouple, changes its electrical characteristics with changes in furnace temperature, thereby outputting voltage, current, or resistance signals corresponding to the temperature, providing basic data for subsequent monitoring and control.

[0026] 2. Data Processing and Logic Judgment: The controller 1 has a built-in programmable logic module that calls preset parameters such as temperature thresholds, smoke alarm conditions, and shutdown logic from the storage unit to analyze and process the received sensor signals. Taking furnace over-temperature judgment as an example, when the signal transmitted by the furnace temperature sensor 2 is converted and the value continuously exceeds the set maximum temperature threshold (such as <750℃ set by the user through the human-machine interaction module 8), the logic module triggers the over-temperature alarm and shutdown program command. For smoke detection in the ventilation duct, the controller 1 uses the signal transmitted by the ventilation duct smoke sensor 4, combined with the dynamic comparison results (difference between the set value and the real-time value) of the dual-channel digital monitor, to determine whether there is actually smoke leakage caused by damage to the smoke pipe, thus avoiding misjudgment caused by environmental interference.

[0027] 3. Alarm and Execution Control Command Output: After the controller 1 determines that an alarm or shutdown condition has been triggered, it outputs the corresponding mode command to the audible and visual alarm unit 6. For example, when the furnace overheats, it drives the speaker to play an ambulance siren and controls the red LED to flash. At the same time, it sends start-stop control signals to the blower, grate, circulating fan, induced draft fan, and forced draft fan through the actuator interface 7. Taking the furnace overheat shutdown process as an example, the commands act on the actuators in sequence: first, the power circuits of the blower and grate are cut off to stop their operation; then, according to the set delay time (10 minutes, 15 minutes, or 20 minutes, configured by the human-machine interaction module 8), a signal is sent to shut down the circulating fan and induced draft fan after the delay. When the air duct temperature sensor 3 detects that the air duct temperature has dropped to the 20℃-30℃ range, a further command is issued to stop the forced draft fan, completing the staged shutdown action.

[0028] The ventilation duct smoke sensor 4 consists of a high-temperature smoke detector and a smoke signal amplifier. The high-temperature smoke detector is made of high-temperature resistant material (heat resistance ≥300℃) and is installed at the 90mm×22mm rectangular hole at the ventilation duct outlet (the four corner Φ8.6mm mounting holes are compatible with M10 fastening bolts). It can operate stably in the high-temperature environment of the ventilation duct, and its bending radius ≥35mm design is suitable for ventilation duct installation space and wiring requirements. The smoke signal amplifier operates in an environment of -10℃–+55℃ and relative humidity 35%–85%. It has a built-in dual-channel digital monitor that dynamically adjusts the detection sensitivity by continuously comparing the set sensitivity value with the real-time smoke signal value (the smaller the difference between the set value and the real-time value, the higher the sensitivity). When the flue is damaged due to aging or other reasons, smoke enters the ventilation duct. The detector captures smoke particles, causing changes in optical and electrical characteristics. The amplifier converts these changes into an electrical signal and amplifies it, transmitting it to controller 1 as the basis for smoke alarm and boiler shutdown judgment.

[0029] Audible and visual alarm unit 6: Based on a combination of multi-color LED indicator lights and a speaker, it receives commands from controller 1 to implement differentiated alarms. Different fault types correspond to specific alarm modes: furnace overheating triggers an ambulance siren and flashing red LEDs, using the strong warning of the ambulance sound to quickly alert personnel to the danger in the furnace; ventilation duct overheating corresponds to a siren and flashing yellow LEDs, distinguishing it from the furnace overheating alarm; ventilation duct smoke triggers a fire truck siren and flashing blue LEDs. Through the dual differences of sound and light, boiler operators can intuitively identify the fault type, improving emergency response efficiency.

[0030] Human-Machine Interaction Module 8: Integrates a power switch, an automatic / manual control switch, an alarm extinguishing button, and a temperature setting interface. The power switch controls the overall power supply to the device, and each module initializes upon activation. The automatic / manual control switch allows switching between two operating modes. In automatic control mode, the device automatically executes alarm and shutdown procedures according to preset logic. In manual control mode, only the temperature display and alarm indication functions are retained, and control of the combustion system is transferred to the boiler operator. The alarm extinguishing button is used to manually intervene in the alarm sound. When pressed, the speaker stops emitting sound, but the alarm LED continues to flash until the alarm conditions (such as temperature drop or smoke dissipation) are cleared, thus avoiding continuous alarm interference while ensuring continuous fault status indication. The temperature setting interface allows users to set key parameters such as the furnace outlet temperature over-temperature point, the maximum alarm value of the air duct outlet temperature, and the blower stop temperature according to the actual operating conditions of the hot blast stove, flexibly adapting to different models and operating requirements of hot blast stoves.

[0031] 0. Implementation method:

[0032] During installation, furnace temperature sensor 2 is fixed to the furnace, cables “11” (+) and “12” (-) are connected accordingly, and the aviation plug is inserted and locked. Duct temperature sensor 3 is fixed to the duct, cables “13” (+), “14”, and “15” (-) are connected accordingly, and the aviation plug is connected. Wellhead mixed air temperature sensor (5) is fixed to the wellhead, cables “16” (+) and “17” (-) are connected accordingly, and the aviation plug is inserted and locked.

[0033] For the installation of the smoke sensor 4 in the ventilation duct, a 90x22mm hole needs to be drilled at the outlet of the ventilation duct, and Φ8.6mm holes need to be drilled at the four corners and M10 threads should be used. After fixing, it should be connected to the device.

[0034] Connect the power supply and set the parameters through the human-machine interaction module 8: furnace over-temperature point (generally <750℃), air duct over-temperature point (generally <120℃), blower stop temperature (20℃-30℃), and furnace over-temperature shutdown delay (10, 15, 20 minutes).

[0035] During operation, in automatic control mode, the furnace will automatically shut down according to the program after confirming overheating of the furnace or smoke from the ventilation duct; in manual control mode, only the alarm is displayed, and the boiler operator is responsible for operation. When an alarm sounds, pressing the alarm silence button will stop the sound, and the alarm light will flash until the fault disappears.

[0036] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A safety interlock intelligent protection alarm device for hot blast stoves, characterized in that: include: The controller (1) has a built-in programmable logic module and storage unit; Furnace temperature sensor (2) is connected to controller (1) and has a measurement range of 0℃–1300℃; The air duct temperature sensor (3) is connected to the controller (1) and has a measurement range of -199℃–650℃. The ventilation duct smoke sensor (4) includes a high-temperature smoke detector and a smoke signal amplifier, with a heat resistance temperature ≥300℃ and a bending radius ≥35mm; Wellhead mixed air temperature sensor (5) is connected to controller (1) with a measurement range of -20℃–50℃; The audible and visual alarm unit (6) is connected to the controller (1) and includes a speaker and a multi-color LED indicator. The actuator interface (7) is electrically connected to the control terminals of the blower, grate, circulating fan, induced draft fan, and forced draft fan; The human-machine interaction module (8) includes a power switch, an automatic / manual control switch, an alarm extinguishing button, and a temperature setting interface.

2. The intelligent protection alarm device for safety interlocking of hot blast stove according to claim 1, characterized in that: The mounting structure of the high-temperature smoke detector includes: a 90mm×22mm rectangular hole at the outlet of the air duct; and Φ8.6mm mounting holes at the four corners for M10 fastening bolts.

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