Automatic water valve control device of hydraulic soot blower

Abstract

The invention relates to an automatic water valve control device for a hydraulic soot blower, and the device comprises a local control box P2 which is connected with local installation equipment P6, P5, P4 and P3 through cables 01, 02, 03 and 04; a local control box inner wiring terminal G2, a remote alarm signal wiring terminal G3 and an electrode type water level gauge part G4 are arranged in the grounding control box P2; the alternating current control part G1 comprises a left main line L and a right main line N, is led from an alternating current 220V power supply and is provided by a remote cable 05, the left main line L and the right main line N pass through an air switch KG1, lower opening lines of the air switch are J01 and J02, a plurality of relay contacts, a position switch, a motor, a capacitor, a pressure controller and a water level gauge are arranged in the middle of the alternating current control part G1, and the alternating current control part G1 is used for automatically switching on and switching off a waterway in the soot blowing process of the hydraulic soot blower. Meanwhile, the functions of protecting the mechanical gun barrel and preventing water leakage are achieved, articles needed for manufacturing are common elements on site, the price is low, installation is convenient, and a large amount of cost is saved when the system is used for replacing original equipment.

Description

Technical Field

[0001] This invention belongs to the field of power plant equipment technology, and in particular relates to an automatic water valve control device for a hydraulic soot blower. Background Technology

[0002] A boiler hydraulic soot blower is a device that uses high-pressure water jets to remove ash from the heating surfaces of a boiler. Water is pumped into the boiler and then sprayed onto the heating surfaces at a specific speed and pressure through valves. The impact force of the high-pressure water jets can strip away the ash, while the resulting eddies and shock waves remove fine dust particles.

[0003] The mechanical water valves in the hydraulic sootblower system of Units 1 and 2 of a certain company are severely aged. During the operation of the hydraulic sootblower, prolonged high temperatures cause frequent jamming of the mechanical water valves. This results in frequent instances of insufficient water flow, burning out the sootblower nozzles; or continuous water flow, leading to widespread leakage, accelerating the deterioration of the water-cooled walls and causing water damage and burnout of lower equipment. These abnormal operating conditions severely affect the normal operation of the boiler and increase the workload of maintenance personnel. Therefore, it is necessary to manufacture an automatic water valve control device to replace the original mechanical water valves and meet the on-site requirements. Summary of the Invention

[0004] The purpose of this invention is to provide an automatic water valve control device for a hydraulic sootblower. This device, composed of relays, position switches, electric water valves, pressure controllers, electrode-type water level gauges, water level electrodes, and a water tank, is used for the automatic connection and disconnection of the water circuit during the sootblowing process. It also protects the mechanical barrel and prevents leakage. Furthermore, all required components are commonly used on-site parts, making it inexpensive and easy to install. Using this system to replace the original equipment will save significant costs.

[0005] This invention provides an automatic water valve control device for a hydraulic soot blower, comprising: The local control box P2 is connected to the locally installed equipment P6, P5, P4 and P3 respectively via cables 01, 02, 03 and 04; the grounding control box P2 is equipped with the local control box wiring terminal G2, the remote alarm signal wiring terminal G3 and the electrode-type water level gauge part G4. The AC control section G1 includes the left main line L and the right main line N, which are drawn from the AC 220V power supply and provided by the remote cable 05. The left main line L and the right main line N are connected to the circuit breaker KG1. The lower terminals of the circuit breaker are J01 and J02. The middle part consists of multiple relay contacts, position switches, motors, capacitors, pressure controllers, and water level gauges. The AC control section G1 consists of 7 branches, of which: The first branch is the water valve branch, which is formed by connecting the AC220V L line node J01 through the water valve position switch KG2.NO, then through node J09 and the water valve closing branch relay K2.1NC in series, and then through node J10 and the water valve branch relay K1 coil in series. The second branch is the water valve closing branch, which is composed of AC220V L line node J01, water valve position switch KG2.NC, then node J11 and water valve branch relay K1.1NC in series, and then node J12 and water valve closing branch relay K2 coil in series. The third branch is the water pressure satisfaction branch, which is composed of AC220V L line node J01, water pressure controller KP.NO, node J19, and water pressure satisfaction branch relay coil K3 connected in series. The fourth branch is the timeout branch, which is formed by connecting the AC220V L line node J01 through the water valve branch relay K1.2NO, through node J20, and the water valve closing branch relay K2.1NC in series, and then through node J21 and the timeout branch time relay KT coil in series. The fifth branch is the high water level interruption branch, which is composed of AC220V L line node J01, local water level gauge KS.1NO, node J21, and the high water level interruption branch relay K4 coil connected in series. The sixth branch is the electric water valve gate branch. It is connected in series from the AC220V L line node J01, through the water valve branch relay K1.1NO, through node J13, and the water pressure satisfied branch relay K3.1NO. Then it is connected in series with the timeout branch time relay KT1.NC through node J14, and then connected to the electric water valve gate motor through node J15. The seventh branch is the electric water valve branch. It is connected in parallel from the AC220V L line node J01, through the water valve closing branch relay K2.1NO, the timeout branch time relay KT1.NO, and the high water level shut-off branch relay K4.1NO, and then through nodes J16 and J18. Finally, it is connected to the electric water valve motor through node J17. The capacitor is connected in parallel at nodes J15 and J17, and the AC220V N line node J02 is connected to the common line of the electric water valve motor.

[0006] Furthermore, the P6 consists of a miniature water tank and a water level electrode, serving as the measurement component. It is installed on the outer wall of the boiler furnace, below the water jet gun barrel, and is used to measure water leakage during the soot blowing process. P5 is the water valve positioning switch, which is a local triggering part. It is installed at 1 / 3 of the body of the hydraulic soot blower. When the hydraulic soot blower is moving, the mechanical part pushes the positioning switch to flip and then supplies power to the electric door of the water valve. P4 is a water valve electric door, which is a local actuator. It is installed at the water inlet pipe of the hydraulic soot blower, after the pressure controller, and is used to connect and disconnect the soot blowing water source. The P3 is a pressure controller, a local measurement component, installed at the water inlet pipe of the hydraulic soot blower, in front of the electric water valve, to monitor whether the water pressure is normal and to realize the underpressure protection function.

[0007] Furthermore, the electrode-type water level gauge section G4 is powered by an AC 220V circuit breaker KG1. The water level gauge input channel is connected to two electrodes, which are located inside the P6 miniature water tank. The alarm channel output KS.1NO is connected to the AC control section G1 via cable 01.

[0008] Furthermore, the water valve branch is used to power the water valve electric door to close. When the hydraulic soot blower retracts and touches the water valve position switch to reset, KG2.NC is turned on, the water valve branch relay K1 is not energized and K1.1NC is turned on, the water valve closing branch relay K2 is energized and interlocked with the water valve branch relay K1. The water valve closing branch is used to power the water valve electric door to close. When the hydraulic soot blower is retracting and touches the water valve position switch reset action, KG2.NC is turned on, the water valve branch relay K1 is not energized and K1.1NC is turned on, the water valve closing branch relay K2 is energized and interlocked with the water valve branch relay K1. The water pressure meets the allowable conditions for the branch to open the electric valve. After the hydraulic soot blowing pump is running, when the water pressure meets the allowable conditions, the water pressure controller contact KP.NO is closed, and the water pressure meets the branch relay K3 for excitation. The electric valve branch circuit is used to realize the opening action of the electric valve. When the hydraulic soot blower touches the water valve position switch during its forward movement, the water valve branch circuit relay K1 is energized, and K1.1NO is turned on. Under the condition that the water pressure is sufficient, the water pressure sufficient branch circuit relay K3 is energized, and K3.1NO is turned on. Under the condition that the soot blower operation is timed out, KT1.NC is turned on, the circuit is connected, and the electric valve is opened. The electric valve closing branch is used to realize the electric valve closing action. When the hydraulic soot blower resets the water valve position switch, the water valve closing branch relay K2 is energized, K2.1NO is turned on, the circuit is connected, and the electric valve closes. When the soot blower runs for a timeout, the timeout branch time relay KT is energized, KT1.NO is turned on, the circuit is connected, and the electric valve closes. When the water pressure meets the requirements, the water pressure controller contact KP.NO is turned on, and the water pressure meets the requirements, energizing the water valve closing action. The water pressure meets the requirements branch for the electric valve to open. After the hydraulic soot blower pump starts running, when the water pressure meets the requirements, the water pressure controller contact KP.NO is turned on, and the water pressure meets the requirements branch relay K3 is energized. The timeout branch is used to implement timeout protection. When the water valve is in position during the forward movement of the hydraulic sootblower, KG2.NO is activated, the water valve branch relay K1 is energized, and K1.2NO is activated. At this time, the water valve closing branch relay K2 is not energized, and K2.2NC is activated. The timeout branch time relay KT is energized. At this time, the timer starts. If the set time is exceeded and the time relay KT is still not de-energized, KT1.1NO is activated, and the sootblower timeout protection is activated. The water valve electric door is powered off, and KT1.2NO is activated to send a timeout alarm to the DCS cabinet. The high-level water cut-off branch is used to realize water leakage protection. During the operation of the hydraulic soot blower, the electric door of the water valve is normally open. When an abnormality occurs and the water in the miniature water tank increases to a certain level, the signal electrode of the electrode-type water level gauge in the water tank is turned on, triggering KS.1NO to be turned on and relay K4 to be energized. At this time, water leakage protection is triggered, the electric door of the water valve is shut off and powered off, and KS.2NO is turned on to send a timeout alarm to the DCS cabinet.

[0009] Furthermore, the remote alarm signal wiring terminal G3 has the upper sequence number being terminal node number Z1-Z10; and the lower sequence number being the signal name within the remote DCS cabinet.

[0010] Furthermore, The first and second cores of the remote cable 06 are led from the local control box Z1 and Z2 and connected to the water valve branch relay K1.4NO; The third and fourth cores of the remote cable 06 are led from the local control box Z3 and Z4 and connected to the water valve closing branch relay K2.4NO; The fifth and sixth cores of the remote cable 06 are connected to the local control box Z5 and Z6 and the water pressure-compliant branch relay K3.2NO. The seventh and eighth cores of the remote cable 06 are connected to the time relay KT1.2NO from the timeout branch of the local control box Z7 and Z8; The ninth and tenth cores of the remote cable 06 are connected to the high water level interruption relay KS.2NO from the local control box Z9 and Z10.

[0011] Furthermore, the remote alarm action is as follows: When the water valve position switch is activated, K1.4NO is turned on, and the water valve open status signal is transmitted to the DCS cabinet. When the water valve position switch is reset, K2.4NO is turned on, and the water valve closed status signal is transmitted to the DCS cabinet. When the soot blowing water pressure is sufficient, K3.2NO is turned on, and the water pressure sufficient status signal is transmitted to the DCS cabinet. When the time relay is powered on and delayed, KT1.2NO is activated, and the timeout status signal is transmitted to the DCS cabinet. When the electrode inside the miniature water tank is conductive, KS.2NO is activated, and a high water level signal is transmitted to the DCS cabinet.

[0012] Furthermore, the wiring terminal G2 inside the local control box has terminal node numbers J09-J22 on the upper part and external device identifiers on the lower part.

[0013] By employing the above solution and utilizing the automatic water valve control device for the hydraulic sootblower, the traditional water flow mode of the hydraulic sootblower is changed. While maintaining the integrity of its functions, the following additional functions are added, resulting in the following technical effects: 1) A "water pressure satisfied" judgment function has been added to prevent damage to the sootblower barrel due to overheating caused by insufficient water pressure during prolonged operation in hydraulic soot blowing, which would also affect the soot blowing effect.

[0014] 2) Install a small water tank at the bottom of the hydraulic soot blower gun tube on the furnace wall. When the gun tube leaks water, it can send a "high water level in the tank" alarm to the DCS system to remind the operators and interlock to close the water gate, while avoiding damage to the water-cooled wall and the equipment below.

[0015] 3) To prevent the sootblower from retracting due to mechanical jamming, resulting in prolonged water spraying or leakage into the furnace, a time relay will issue a "sootblowing timeout" alarm and automatically shut off the water valve. This provides better protection for the equipment.

[0016] 4) All the materials required for the manufacture of this device are commonly used on-site components, which are inexpensive and easy to maintain.

[0017] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a terminal diagram of the local control box of the present invention; Figure 3 This is the AC control principle diagram of the present invention. Figure 4 This is the wiring diagram of the electrode-type water level gauge of the present invention; Figure 5 This is a diagram of the remote signal terminal of the present invention. Detailed Implementation

[0019] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0020] This embodiment provides an automatic water valve control device for a hydraulic sootblower. The device consists of four AC220V relays, one AC220V time relay, one water level gauge, two water level electrodes, one pressure controller, one position switch, and a miniature water tank. The device includes a local control box, four external devices, and a signal cable to the DCS system. The local control box is installed at the hydraulic sootblower in the furnace and requires a 220V AC power supply and a shielded remote signal cable. The device includes a water valve limit switch, pressure controller, electrode-type water level gauge, water level electrodes, miniature water tank, and electric water valve gate. The control circuit within the local control box and the externally installed devices enable automatic opening, closing, prohibition of opening, forced closing, and timeout closing of the electric water valve gate during the sootblowing process. It also features displays and alarms for "opening," "closing," "low voltage," "high water level," and "timeout," and is connected to the DCS cabinet via a remote cable. This invention Figure 1 P2, P3, P4, P5, and P6 are all part of this device; the rest are external devices.

[0021] P1 in the diagram is the DCS cabinet, which is an external device. This device sends DI signals to the DCS system: "Water valve open", "Water valve closed", "Low voltage", "High water level", and "Timeout". It is connected to the remote control box P2 via remote cable 06.

[0022] Figure 1 P2 is the local control box, which is the control part of this device and is installed near the local soot blower body. It is powered by remote cable 05 and connected to the locally installed equipment P6, P5, P4, and P3 through cables 01, 02, 03, and 04, respectively.

[0023] Figure 1 P3 is the pressure controller, the local measurement component of this device. It is installed at the water inlet pipe of the hydraulic soot blower, before the electric water valve, to monitor whether the water pressure is normal and to implement the underpressure protection function. It is connected to the local control box P2 via cable No. 04.

[0024] Figure 1 P4 is the electric water valve, the local actuator of this device. It is installed at the water inlet pipe of the hydraulic soot blower, after the pressure controller, and is used to connect and disconnect the soot blowing water source. It is connected to the local control box P2 via cable No. 03.

[0025] Figure 1 P5 is the water valve positioning switch, which is the local triggering part of this device. It is installed at 1 / 3 of the hydraulic sootblower body. When the hydraulic sootblower is moving, the mechanical part pushes the positioning switch to flip, which then supplies power to the electric water valve. It is connected to the local control box P2 via cable No. 02.

[0026] Figure 1 P6, consisting of a miniature water tank and a water level electrode, is the measuring component of this device. It is installed on the outer wall of the boiler furnace, below the water-cooled sootblower nozzle, to measure water leakage during sootblowing. This provides leakage protection. It is connected to the local control box P2 via cable 01.

[0027] The meanings of the English abbreviations involved in this device are shown in the table below: Table 1. Illustration of this device The relays used in this device are named according to the following principles: Taking the MT4NGS24VDC relay manufactured by OMRON as an example: pins 1, 5, and 9 are channel 1, pins 1 and 9 are normally closed contacts (NC), and pins 5 and 9 are normally open contacts (NO); pins 2, 6, and 10 are channel 2, pins 2 and 10 are normally closed contacts (NC), and pins 6 and 10 are normally open contacts (NO); pins 3, 7, and 11 are channel 3, pins 3 and 11 are normally closed contacts (NC), and pins 7 and 11 are normally open contacts (NO); pins 4, 8, and 12 are channel 4, pins 4 and 12 are normally closed contacts (NC), and pins 8 and 12 are normally open contacts (NO).

[0028] For example, the first channel of the first relay in this device uses a normally closed contact, denoted as K1.1NC; the second channel of the second relay in this device uses a normally open contact, denoted as K2.2NO, and so on.

[0029] The naming convention for the contacts of other devices used in this device is the same as that for relays.

[0030] Figure 2 This is the wiring diagram for terminal block G2 inside the local control box. It is located inside the local control box (P2) in the overall system schematic. The upper sequence number corresponds to node numbers J09-J22 as defined in the schematic diagram of this device. The lower sequence number indicates the external device identification, and the following description is for the external device. The cables are described as follows: Cable 01: Connects the water level electrode and water level gauge of this device. Cable 02: Connects the normally open and normally closed contacts of the water valve limit switch to this device; this is the power cable from this device to the motor. Cable 03: Connects the normally open contact of the pressure gauge to this device. Cable 04: Provides power to the electric water valve. Remote cable 05: Provides AC 220V power to the control box of this device. Remote cable 06: Connects the local control box of this device to the DCS cabinet.

[0031] Figure 3 The schematic diagram for the AC control section G1 shows the components located in the local control box P2 in the overall system diagram. The motor within the dashed line is an external device, located at P4 in the overall system diagram.

[0032] The connection instructions are as follows: The first branch, "Water Valve Branch," is composed of AC220V L-line node J01, which is connected in series with the water valve position switch KG2.NO, then through node J09, and the "Water Valve Closed Branch" relay K2.1NC. Finally, it is connected in series with the coil of the "Water Valve Open" relay K1 through node J10.

[0033] The second branch, the "water valve closed branch", is composed of AC220V L line node J01, water valve position switch KG2.NC, then node J11, and "water valve open branch" relay K1.1NC connected in series, and then node J12, and "water valve closed" relay K2 coil connected in series.

[0034] The third branch, "Water Valve Electric Door Branch", starts from AC220V L line node J01, passes through "Water Valve Open" relay K1.1NO, and is connected in series with "Water Pressure Satisfaction" relay K3.1NO via node J13, then in series with "Timeout" time relay KT1.NC via node J14, and finally connected to the water valve electric door motor via node J15. The fourth branch, "Water Valve Electric Gate Branch," starts from the AC220V L line node J01, passes through the "Water Valve Closed" relay K2.1NO, the "Timeout" relay KT1.NO, and the "High Water Level" relay K4.1NO, and is connected in parallel via nodes J16 and J18. It then connects to the water valve electric gate motor via node J17. A capacitor is connected in parallel via nodes J15 and J17, and the AC220V N line node J02 is connected to the common line of the water valve electric gate motor.

[0035] The fifth branch, "Water Pressure Satisfaction Branch", is composed of AC220V L-line node J01 connected in series with the coil of "Water Pressure Satisfaction" relay K3 via node J19 through water pressure controller KP.NO.

[0036] The 6th branch, the "timeout branch", is composed of AC220V L line node J01, which is connected in series with the "water valve open" relay K1.2NO through node J20 and the "water valve close" relay K2.1NC, and then connected in series with the "timeout" time relay KT coil through node J21.

[0037] The 7th branch, "High Water Level Interruption Branch", is composed of AC220V L-line node J01, local water level gauge KS.1NO, node J21, and "High Water Level" relay K4 coil connected in series.

[0038] The principle is explained as follows: Circuit breaker KG1 enables the entire circuit to be connected and disconnected from power.

[0039] The "water valve branch" enables the "water valve electric door to open power supply". When the water valve is in position during the advance of the hydraulic soot blower, KG2.NO is turned on, the "water valve closed" relay K2 is not energized and K2.1NC is turned on, the "water valve open" relay K1 is energized and interlocked with the "water valve closed" relay K2.

[0040] The "water valve closed branch" enables "water valve electric door closed power supply". When the hydraulic soot blower is retracting and touches the water valve position switch reset action, KG2.NC is turned on, the "water valve open" relay K1 is not energized and K1.1NC is turned on, the "water valve closed" relay K2 is energized and interlocked with the "water valve open" relay K1.

[0041] The "water valve electric gate branch circuit" realizes the "water valve electric gate opening action". When the hydraulic soot blower moves forward and touches the water valve position switch, the "water valve open" relay K1 is energized, and K1.1NO is turned on. Under the condition that the water pressure is sufficient, the "water pressure satisfied" relay K3 is energized, and K3.1NO is turned on. Under the condition that the soot blower operation is overtime, KT1.NC is turned on, the circuit is connected, and the water valve electric gate opening action is realized.

[0042] The "water valve electric closing branch" enables the "water valve electric closing action." When the hydraulic soot blower resets the water valve position switch, the "water valve closed" relay K2 is energized, K2.1NO is activated, the circuit is completed, and the water valve electric closing action is achieved. If the soot blower operation times out, the "timeout" relay KT is energized, KT1.NO is activated, the circuit is completed, and the water valve electric closing action is achieved. The "water pressure satisfied" relay K3 is energized, K4.1NO is activated, and the water valve electric closing action is achieved.

[0043] "Water pressure meets the branch" refers to the "permitted condition for the electric valve to open". After the hydraulic soot blowing pump is running, when the water pressure meets the permitted condition, the water pressure controller contact KP.NO is closed, and the "water pressure meets" relay K3 is energized.

[0044] The "timeout branch" implements "timeout protection." When the hydraulic sootblower is advancing and the water valve reaches its position, KG2.NO is activated, energizing the "water valve open" relay K1 and energizing K1.2NO. At this time, the "water valve close" relay K2 is de-energized, while K2.2NC is activated, energizing the "timeout" relay (power-on delay action) KT. Timing begins at this point. If the set time is exceeded and the time relay KT has not yet de-energized, KT1.1NO is activated, triggering the sootblower's "timeout" protection. This ensures "power is supplied to the electric water valve when it closes," and simultaneously, KT1.2NO is activated, sending a "timeout" alarm to the DCS cabinet.

[0045] The "high water level cut-off branch" enables "leakage protection". During the operation of the hydraulic soot blower, the electric water valve is normally open. When an abnormality occurs and the water in the miniature water tank increases to a certain level, the signal electrode of the electrode-type water level gauge in the water tank is activated, triggering KS.1NO to be turned on and relay K4 to be energized. At this time, "leakage protection" is triggered, realizing "power off the electric water valve". At the same time, KS.2NO is turned on, sending an "overtime" alarm to the DCS cabinet.

[0046] Figure 4 This is the wiring diagram for an electrode-type water level gauge. The listed components, including the electrode, are located inside the miniature water tank (P6), and the water level gauge is located inside the local control box (P2).

[0047] The connection instructions are as follows: The water level gauge is powered by a 220V AC circuit breaker KG1. Using cable 01, the two electrodes inside the miniature water tank are connected to the input terminals of the water level gauge. Various parameters of the water level gauge are set, and the alarm channel output KS.1NO is connected to the AC control section G1. The alarm channel output KS.2NO is connected to the remote signal section G3.

[0048] The principle is explained as follows: An electrode-type water level gauge is an instrument that measures the water level in a container using the conductivity of liquids. When leakage occurs during hydraulic soot blowing, the water level in the miniature water tank will rise. When the electrodes are conductive, the internal components of the water level gauge will be energized, activating both KS.1NO and KS.2NO. This interlocks to shut off the water valve and send an alarm signal to the DCS cabinet.

[0049] Figure 5 For the remote signal terminal diagram G3, the listed components are located in the local control box P2 in the overall system schematic diagram.

[0050] The connection instructions are as follows: The remote alarm signal terminal G3 has the upper sequence number as the node number Z1-Z10 defined in the terminal diagram; the lower sequence number is the signal name inside the remote DCS cabinet.

[0051] The first and second cores of the remote cable 06 are connected to the "water valve open" relay K1.4NO from the local control box Z1 and Z2; The third and fourth cores of remote cable 06 are connected to the "water valve closed" relay K2.4NO from the local control box Z3 and Z4; the fifth and sixth cores of remote cable 06 are connected to the "water pressure satisfied" relay K3.2NO from the local control box Z5 and Z6. The seventh and eighth cores of the remote cable 06 are connected to the "timeout" relays KT1.2NO from the local control box Z7 and Z8; The ninth and tenth cores of the remote cable 06 are connected to the "high water level" relays KS.2NO from the local control box Z9 and Z10. The principle is explained as follows: When the water valve position switch is activated, K1.4NO is turned on, and the "water valve open" status signal is transmitted to the DCS cabinet.

[0052] When the water valve position switch is reset, K2.4NO is turned on, and the "water valve closed" status signal is transmitted to the DCS cabinet.

[0053] When the soot blowing water pressure is sufficient, K3.2NO is turned on, and the "water pressure sufficient" status signal is transmitted to the DCS cabinet.

[0054] When the time relay is powered on and delayed, KT1.2NO is activated, and the "timeout" status signal is transmitted to the DCS cabinet.

[0055] When the electrode inside the miniature water tank is conductive, KS.2NO is activated, and the "high water level" status signal is transmitted to the DCS cabinet.

[0056] according to Figure 1 Connect cables 01 to 06 and other equipment. With the soot blower not blowing soot, in the local control box P2, confirm that the power switch KG1 is energized. At this time, the "Water valve closed branch" relay K2 is energized, and other relays are de-energized. The water level gauge is lit, but there is no output command signal. Connect the equipment locally; the miniature water tank is securely installed and empty; the electric water valve is closed; the water valve position switch is reset; the soot blowing pump is not started, there is no water in the inlet pipe, the pressure controller is activated, and the "Water pressure satisfied" relay K3 is de-energized.

[0057] Automatic water valve opening function during hydraulic soot blowing: When the soot blowing water pump starts and the water pressure is normal, relay K3 is energized. During the forward movement of the hydraulic soot blower, the mechanical contact touches the water valve's position switch, causing it to activate. Relay K1 is then energized, and the electric water valve door opens normally.

[0058] Automatic water valve shut-off function during hydraulic soot blowing: During the retraction of the hydraulic soot blower, the mechanical contact touches the water valve's position switch, causing it to reset. Relay K1 is demagnetized, relay K2 is energized, and the electric water valve door closes normally.

[0059] Start-prohibition function: If the water pressure in the inlet pipe does not meet the soot blowing requirements before the hydraulic soot blower is started, and relay K3 is not energized, the hydraulic soot blower will be prohibited from starting. At the same time, the electric water valve will not be able to open. An "undervoltage" alarm signal will be sent to the single-control DCS system.

[0060] Automatic shut-off function for water valve after timeout: During hydraulic soot blowing, after the electric water valve opens normally, the time relay KT coil is energized and activates after a delay. If the soot blower fails to retreat to the designated position within the specified time and cannot automatically close the electric water valve, the time relay KT activates, interlocking and disconnecting the electric water valve opening circuit. Simultaneously, the electric water valve closing circuit is interlocked and activated, closing the electric water valve and cutting off the water supply. An "overtime" alarm signal is sent to the single-control DCS system.

[0061] Automatic high water level shut-off function: During hydraulic soot blowing, if water leaks at the soot blowing hole, it flows along the outer wall of the furnace to the micro water tank, causing the water level in the tank to rise. When the water level rises to the water level electrode, the electrode conducts, the water level gauge outputs an action signal, the relay K4 is energized, and the electric door of the water valve is closed in an interlock. At the same time, a "high water level" alarm signal is sent to the single-control DCS system.

[0062] The present invention has the following technical effects: 1) A "water pressure satisfied" judgment function has been added to prevent damage to the sootblower barrel due to overheating caused by insufficient water pressure during prolonged operation in hydraulic soot blowing, which would also affect the soot blowing effect.

[0063] 2) Install a small water tank at the bottom of the hydraulic soot blower gun tube on the furnace wall. When the gun tube leaks water, it can send a "high water level in the tank" alarm to the DCS system to remind the operators and interlock to close the water gate, while avoiding damage to the water-cooled wall and the equipment below.

[0064] 3) To prevent the sootblower from retracting due to mechanical jamming, resulting in prolonged water spraying or leakage into the furnace, a time relay will issue a "sootblowing timeout" alarm and automatically shut off the water valve. This provides better protection for the equipment.

[0065] 4) All the materials required for the manufacture of this device are commonly used on-site components, which are inexpensive and easy to maintain.

[0066] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An automatic water valve control device for a hydraulic soot blower, characterized in that, include: The local control box P2 is connected to the locally installed equipment P6, P5, P4 and P3 respectively via cables 01, 02, 03 and 04; the grounding control box P2 is equipped with the local control box wiring terminal G2, the remote alarm signal wiring terminal G3 and the electrode-type water level gauge part G4. The AC control section G1 includes the left main line L and the right main line N, which are drawn from the AC 220V power supply and provided by the remote cable 05. The left main line L and the right main line N are connected to the circuit breaker KG1. The lower terminals of the circuit breaker are J01 and J02. The middle part consists of multiple relay contacts, position switches, motors, capacitors, pressure controllers, and water level gauges. The AC control section G1 consists of 7 branches, of which: The first branch is the water valve branch, which is formed by connecting the AC220V L line node J01 through the water valve position switch KG2.NO, then through node J09 and the water valve closing branch relay K2.1NC in series, and then through node J10 and the water valve branch relay K1 coil in series. The second branch is the water valve closing branch, which is composed of AC220V L line node J01, water valve position switch KG2.NC, then node J11 and water valve branch relay K1.1NC connected in series, and then node J12 and water valve closing branch relay K2 coil connected in series. The third branch is the water pressure satisfaction branch, which is composed of AC220V L line node J01, water pressure controller KP.NO, node J19, and water pressure satisfaction branch relay coil K3 connected in series. The fourth branch is the timeout branch, which is formed by connecting the AC220V L line node J01 through the water valve branch relay K1.2NO, through node J20, and the water valve closing branch relay K2.1NC in series, and then through node J21 and the timeout branch time relay KT coil in series. The fifth branch is the high water level interruption branch, which is composed of AC220V L line node J01, local water level gauge KS.1NO, node J21, and the high water level interruption branch relay K4 coil connected in series. The sixth branch is the water valve electric gate branch. It is connected in series from AC220V L line node J01, water valve branch branch relay K1.1NO, and water pressure satisfied branch relay K3.1NO through node J13. Then it is connected in series with timeout branch time relay KT1.NC through node J14. Finally, it is connected to the water valve electric gate motor through node J15. The seventh branch is the electric water valve gate branch. It is connected in parallel from the AC220V L line node J01, through the water valve closing branch relay K2.1NO, the timeout branch time relay KT1.NO, and the high water level shut-off branch relay K4.1NO, and then through nodes J16 and J18. Finally, it is connected to the electric water valve gate motor through node J17. The capacitor is connected in parallel at nodes J15 and J17, and the AC220V N line node J02 is connected to the common line of the electric water valve gate motor.

2. The automatic water valve control device for a hydraulic soot blower according to claim 1, characterized in that, The P6 consists of a miniature water tank and a water level electrode. It is the measuring part and is installed on the outer wall of the boiler furnace, below the water soot blower barrel. It is used to measure water leakage during the soot blowing process. P5 is the water valve positioning switch, which is a local triggering part. It is installed at 1 / 3 of the body of the hydraulic soot blower. When the hydraulic soot blower is moving, the mechanical part pushes the positioning switch to flip and then supplies power to the electric door of the water valve. P4 is a water valve electric door, which is a local actuator. It is installed at the water inlet pipe of the hydraulic soot blower, after the pressure controller, and is used to connect and disconnect the soot blowing water source. The P3 is a pressure controller, a local measurement component, installed at the water inlet pipe of the hydraulic soot blower, in front of the electric water valve, to monitor whether the water pressure is normal and to realize the underpressure protection function.

3. The automatic water valve control device for a hydraulic soot blower according to claim 2, characterized in that, The electrode-type water level gauge section G4 is powered by AC 220V circuit breaker KG1. The water level gauge input channel is connected to two electrodes, which are located in the P6 miniature water tank. The alarm channel output KS.1NO is connected to the AC control section G1 through cable 01.

4. The automatic water valve control device for a hydraulic soot blower according to claim 3, characterized in that, The water valve branch is used to power the electric water valve to close. When the hydraulic soot blower is retracting and touches the water valve position switch to reset, KG2.NC is turned on, the water valve branch relay K1 is not energized and K1.1NC is turned on, the water valve closing branch relay K2 is energized and interlocked with the water valve branch relay K1. The water valve closing branch is used to power the water valve electric door to close. When the hydraulic soot blower is retracting and touches the water valve position switch reset action, KG2.NC is turned on, the water valve branch relay K1 is not energized and K1.1NC is turned on, the water valve closing branch relay K2 is energized and interlocked with the water valve branch relay K1. The water pressure meets the allowable conditions for the branch to open the electric valve. After the hydraulic soot blowing pump is running, when the water pressure meets the allowable conditions, the water pressure controller contact KP.NO is closed, and the water pressure meets the branch relay K3 for excitation. The electric valve branch circuit is used to realize the opening action of the electric valve. When the hydraulic soot blower touches the water valve position switch during its forward movement, the water valve branch circuit relay K1 is energized, and K1.1NO is turned on. Under the condition that the water pressure is sufficient, the water pressure sufficient branch circuit relay K3 is energized, and K3.1NO is turned on. Under the condition that the soot blower operation is timed out, KT1.NC is turned on, the circuit is connected, and the electric valve is opened. The electric valve closing branch is used to realize the electric valve closing action. When the hydraulic soot blower resets the water valve position switch, the water valve closing branch relay K2 is energized, K2.1NO is turned on, the circuit is connected, and the electric valve closes. When the soot blower runs for a timeout, the timeout branch time relay KT is energized, KT1.NO is turned on, the circuit is connected, and the electric valve closes. When the water pressure meets the requirements, the water pressure controller contact KP.NO is turned on, and the water pressure meets the requirements, energizing the water valve closing action. The water pressure meets the requirements branch for the electric valve to open. After the hydraulic soot blower pump starts running, when the water pressure meets the requirements, the water pressure controller contact KP.NO is turned on, and the water pressure meets the requirements branch relay K3 is energized. The timeout branch is used to implement timeout protection. When the water valve is in position during the forward movement of the hydraulic sootblower, KG2.NO is activated, the water valve branch relay K1 is energized, and K1.2NO is activated. At this time, the water valve closing branch relay K2 is not energized, and K2.2NC is activated. The timeout branch time relay KT is energized. At this time, the timer starts. If the set time is exceeded and the time relay KT is still not de-energized, KT1.1NO is activated, and the sootblower timeout protection is activated. The water valve electric door is powered off, and KT1.2NO is activated to send a timeout alarm to the DCS cabinet. The high-level water cut-off branch is used to realize water leakage protection. During the operation of the hydraulic soot blower, the electric door of the water valve is normally open. When an abnormality occurs and the water in the miniature water tank increases to a certain level, the signal electrode of the electrode-type water level gauge in the water tank is turned on, triggering KS.1NO to be turned on and relay K4 to be energized. At this time, water leakage protection is triggered, the electric door of the water valve is turned off and powered off, and KS.2NO is turned on to send a timeout alarm to the DCS cabinet.

5. The automatic water valve control device for a hydraulic soot blower according to claim 3, characterized in that, The remote alarm signal wiring terminal G3 has the upper serial number as terminal node number Z1-Z10; and the lower serial number as the signal name in the remote DCS cabinet.

6. The automatic water valve control device for a hydraulic soot blower according to claim 5, characterized in that, The first and second cores of the remote cable 06 are led from the local control box Z1 and Z2 and connected to the water valve branch relay K1.4NO; The third and fourth cores of the remote cable 06 are led from the local control box Z3 and Z4 and connected to the water valve closing branch relay K2.4NO; The fifth and sixth cores of the remote cable 06 are connected to the local control box Z5 and Z6 and the water pressure-compliant branch relay K3.2NO. The seventh and eighth cores of the remote cable 06 are connected to the time relay KT1.2NO from the timeout branch of the local control box Z7 and Z8; The ninth and tenth cores of the remote cable 06 are connected to the high water level interruption relay KS.2NO from the local control box Z9 and Z10.

7. The automatic water valve control device for a hydraulic soot blower according to claim 6, characterized in that, The remote alarm action is as follows: When the water valve position switch is activated, K1.4NO is turned on, and the water valve open status signal is transmitted to the DCS cabinet. When the water valve position switch is reset, K2.4NO is turned on, and the water valve closed status signal is transmitted to the DCS cabinet. When the soot blowing water pressure is sufficient, K3.2NO is turned on, and the water pressure sufficient status signal is transmitted to the DCS cabinet. When the time relay is powered on and delayed, KT1.2NO is activated, and the timeout status signal is transmitted to the DCS cabinet. When the electrode inside the miniature water tank is conductive, KS.2NO is activated, and a high water level signal is transmitted to the DCS cabinet.

8. The automatic water valve control device for a hydraulic soot blower according to claim 1, characterized in that, The wiring terminal G2 inside the local control box has terminal node numbers J09-J22 above it and external device identifier below it.

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