A control method and device for automatic slag extrusion of boiler

Abstract

The present invention relates to the technical field of boiler slag discharge system, and in particular to a control method and device for automatic boiler slag extrusion, the method specifically comprising: starting the automatic monitoring mode, detecting and capturing the fallen slag blocks, determining the slag well number where the slag blocks fell; selecting the sequential control slag well number, and presetting the slag extrusion times and the slag discharge interval time; starting the hydraulic oil unit and the extrusion head sequential control program to sequentially crush the slag blocks, and stopping the hydraulic oil unit after the crushing is completed. The system specifically comprises: a detection unit; a central control unit; a control unit; a hydraulic oil unit; the present application automatically detects and selects the slag well number where the slag blocks fell, starts the sequential control program, and can autonomously start the extrusion head in the slag well area for crushing, reducing the workload of personnel, and according to the preset slag extrusion sequence, the slag blocks are broken for the selected slag well, so that each slag well can be automatically squeezed separately, and the three slag wells can also be squeezed sequentially together, ensuring the crushing capacity of the extrusion head.

Description

Technical Field

[0001] The invention relates to the technical field of boiler slag discharge systems, and in particular to a control method and device for automatic boiler slag extrusion. Background Art

[0002] In thermal power plants, taking the dry slag discharge device of the counter-combustion boiler as an example, it is composed of grilles, extrusion heads, driving hydraulic cylinders, support frames, box camera monitoring systems and other parts. Three conical funnel-shaped slag wells are generally arranged at the bottom of the boiler, and three pairs of extrusion heads are arranged under each slag well to control the amount of slag in the steel belt. The extrusion heads in the furnace bottom slag discharge device are hydraulically driven with a hydraulic oil pressure of 10MPa. The front and rear walls of the boiler are arranged horizontally. The small slag dropped in the furnace passes through the grille and falls to the upper part of the steel belt slag conveyor. The large slag first falls on the grille to be cooled, and is crushed by the extrusion head driven by hydraulic oil. Then it falls onto the steel belt slag conveyor, and is transported by the steel belt slag conveyor for the next step of processing. In addition, air inlets are installed on the side panels and top panels of the steel belt slag conveyor box to cool the steel belt and ash. Take a look

[0003] At present, if there is slag on the grille near the No. 1 extrusion head of the No. 1 slag pit of the boiler, the main return oil solenoid valve HYZ of the slag discharge hydraulic system is manually opened, the first hydraulic oil pump is started, and the second hydraulic oil pump is used as a standby. The system oil pressure is increased to 10MPa, and the main extension cylinder solenoid valve SEGZ is opened. The solenoid valve 11Q of the front wall extrusion head at the slag block is opened to be energized, and the system oil pressure drops. The extrusion head begins to extend horizontally toward the opposite extrusion head. After the hydraulic rod of the extrusion head is extended to the right position, it automatically loses power and remains motionless. The system oil pressure is restored to 10MPa. Among them, after the solenoid valve of the extrusion head loses power and closes, the extrusion head will remain in the original position and the system oil pressure is also restored to 10MPa. Then the solenoid valve 11H of the extrusion head opposite to the rear wall of the slag block is opened to be energized, and the extrusion head begins to move to crush the slag block, and the crushed slag falls to the steel belt loosening machine through the grille for discharge.

[0004] Next, close the main solenoid valve SEGZ of the extension cylinder, open the main solenoid valve SUGZ of the retraction cylinder, open the solenoid valve 11Q of the front wall extrusion head at the slag block, and the system oil pressure drops. The extrusion head begins to retract horizontally. After the hydraulic rod of the extrusion head retracts to the position, it automatically loses power and remains motionless, and the system oil pressure returns to 10MPa. Then open the solenoid valve 11H of the extrusion head opposite to the rear wall of the slag block, and the extrusion head also retracts to the position. The extrusion head is opened, and the slag blocks dropped from the boiler fall through the grille to the steel belt slag conveyor.

[0005] The whole process is controlled manually, and multiple squeezes are required to break the slag blocks. In addition, personnel are required to observe the slag falling on site. The temperature of the observation window is relatively high, and there is a risk of high temperature burns during on-site operations. In addition, due to lack of experience, the operators open and close the extrusion head too quickly, which can easily cause a large amount of slag accumulation on the steel belt and cause it to slip and stop operating, increasing the operating risk of the unit. The operators spend a lot of time on opening and closing the extrusion head, which distracts the operators' attention and reduces their work efficiency, which is not conducive to the safe operation of the entire generator set. Summary of the invention

[0006] In some embodiments of the present application, the ordinary camera at the observation window of the boiler slag well is replaced with an infrared temperature measuring camera. According to the high temperature of the large slag blocks falling, the slag blocks of a certain size are captured and located in a certain slag well. The slag well number is automatically detected and selected, and the sequential control program is started. The extrusion head in the slag well area can be automatically started for crushing, which reduces the workload of personnel.

[0007] In some embodiments of the present application, by presetting the steel belt buffer bucket temperature matrix C and the extrusion head opening time interval matrix T, the real-time temperature c of the steel belt buffer bucket is obtained, the slag amount on the steel belt conveyor is judged, and the real-time extrusion head opening time interval t is determined to ensure the stable operation of the steel belt and avoid shutdown due to steel belt slippage.

[0008] In some embodiments of the present application, the slag well number that needs to be subjected to the sequential control procedure is selected according to the slag well number where the slag blocks fall, and the slag blocks of the selected slag well are broken according to the preset slag squeezing sequence, so that each slag well can be automatically squeezed slag separately, and three slag wells can also be squeezed slag sequentially together, and the number of slag squeezing times of the slag well can be flexibly controlled to ensure the crushing capacity of the extrusion head.

[0009] In some embodiments of the present application, by dynamically adjusting the slag discharge interval time, the problem of starting the extrusion head after the slag system has been shut down for a long time and the problem of boiler coke dropping and slag extrusion are solved. There is no need for personnel to stay on site for a long time to observe the amount of slag in the steel strip, thus avoiding the risk of high-temperature burns.

[0010] In some embodiments of the present application, a control method for automatic slag squeezing of a boiler is provided, comprising:

[0011] Step 1: Turn on the automatic monitoring mode, detect and capture the fallen slag blocks, and determine the slag pit number where the slag blocks fell;

[0012] Step 2: Select the sequential slag well number and preset the slag extrusion times and slag discharge interval time;

[0013] Step 3: Start the hydraulic oil unit and the extrusion head sequential control program to crush the slag blocks in sequence, and stop the hydraulic oil unit after the crushing is completed.

[0014] In some embodiments of the present application, the step 2 is specifically as follows:

[0015] Preset the slag extrusion sequence of the slag pit;

[0016] According to the number of the slag well where the slag blocks fall, the slag well number that needs to be controlled is selected, and the slag blocks are broken in the selected slag well according to the preset slag extrusion sequence.

[0017] In some embodiments of the present application, the step 2 further includes:

[0018] A steel strip buffer bucket temperature matrix C (C1, C2, C3) is preset, wherein C1 is a preset value of the first steel strip buffer bucket temperature; C2 is a preset value of the second steel strip buffer bucket temperature; C3 is a preset value of the third steel strip buffer bucket temperature; and C1<C2<C3;

[0019] Get the real-time temperature c of the steel strip buffer hopper. When it is less than temperature C1, the extrusion head is sequentially controlled to open. When the real-time temperature c of the steel strip buffer hopper is greater than C3, the extrusion head stops opening and maintains the current opening.

[0020] Preset extrusion head opening time interval matrix T (T1, T2, T3), wherein T1 is the preset value of the first extrusion head opening time interval; T2 is the preset value of the second extrusion head opening time interval; T3 is the preset value of the third extrusion head opening time interval; and T1<T2<T3;

[0021] The real-time temperature c of the steel strip buffer bucket is obtained, and the real-time extrusion head opening time interval t is determined according to the relationship between the preset steel strip buffer bucket temperature matrix C and the preset extrusion head opening time interval matrix T, as follows:

[0022] When the real-time temperature c of the steel strip buffer hopper is c<C1, the real-time extrusion head opening time interval t is set to the first extrusion head opening time interval preset value T1, that is, t=T1;

[0023] When the real-time temperature c of the steel strip buffer bucket is C1≤c<C2, the real-time extrusion head opening time interval t is set to the second extrusion head opening time interval preset value T2, that is, t=T2;

[0024] When the real-time temperature c of the steel strip buffer bucket is C2≤c<C3, the real-time extrusion head opening time interval t is set to the third extrusion head opening time interval preset value T3, that is, t=T3.

[0025] In some embodiments of the present application, the step 2 further includes:

[0026] Dynamically adjust the slag discharge interval time. After adjusting the slag discharge waiting interval time, the extrusion head in the step sequence obtains the adjusted slag discharge waiting interval time before the next power-on action.

[0027] In some embodiments of the present application, the extrusion head sequential control program is specifically:

[0028] Step a: Open the main solenoid valve of the extrusion head extension cylinder, detect in sequence whether the slag well is selected according to the preset slag well extrusion sequence, and close the extrusion heads of the selected slag wells in sequence and then close the main solenoid valve of the extrusion head extension cylinder;

[0029] Step b: open the main solenoid valve of the extrusion head retraction cylinder, detect whether the slag well is selected according to the preset slag well extrusion sequence, open the extrusion heads of the selected slag wells in turn, then close the main solenoid valve of the extrusion head retraction cylinder, cut off this sequence control, and start the dry slag discharge tripping linkage sequence control.

[0030] In some embodiments of the present application, the step three further includes:

[0031] Preset the first system oil pressure value and the second system oil pressure value;

[0032] Closing the extrusion head in step a is specifically as follows:

[0033] When it is detected that the real-time system oil pressure is higher than the first system oil pressure value for several seconds, the extrusion head loses power and maintains the current position;

[0034] When it is detected that the real-time system oil pressure is lower than the second system oil pressure value for several seconds, the program control ends;

[0035] Opening the extrusion head in step b specifically includes:

[0036] The electromagnetic is controlled to be energized n times to complete the opening process of a single extrusion head.

[0037] In some embodiments of the present application, the step b further includes:

[0038] The duration of the first n-1 energized actions is the preset value of the first energized time, and the extrusion head maintains the current position;

[0039] When the duration of the nth energization action reaches the second energization time preset value and the solenoid valve is fully opened or the real-time system oil pressure is higher than the first system oil pressure value, the extrusion head solenoid valve loses power.

[0040] In some embodiments of the present application, the step three further includes:

[0041] Obtain a preset number of slag extrusion times, and cyclically execute step a and step b according to the preset number of slag extrusion times.

[0042] Some embodiments of the present application provide a control device for automatic slag squeezing of a boiler, comprising:

[0043] The detection unit is arranged at the boiler slag pit observation well, and is used to capture the fallen slag blocks and determine the slag pit number where the slag blocks fell;

[0044] A central control unit is used to obtain the slag pit number determined by the detection unit and select the slag pit number to start the sequential control program;

[0045] Control unit, used to set the number of slag extrusions and the interval time of slag discharge;

[0046] A hydraulic oil unit controls the movement of the extrusion head according to a sequential control program.

[0047] In some embodiments of the present application, the hydraulic oil unit includes:

[0048] Oil return main solenoid valve;

[0049] Extrusion head extension cylinder main solenoid valve;

[0050] Extrusion head retraction cylinder main solenoid valve;

[0051] Several extrusion head solenoid valves and several hydraulic oil pumps.

[0052] Compared with the prior art, the control method and device for automatic slag extrusion of a boiler according to the embodiment of the present invention have the following beneficial effects:

[0053] The present invention can automatically identify the position of the slag blocks dropped from the boiler by using a camera and temperature changes, and select and crush them autonomously, thus reducing the amount of human operation.

[0054] The present invention can judge the amount of slag on the steel belt conveyor according to the temperature of the steel belt buffer bucket, prolong the opening time interval of the extrusion head, ensure the stable operation of the steel belt, and avoid the shutdown caused by the steel belt slipping failure.

[0055] The slag discharge interval of the present invention can be arbitrarily adjusted according to the size and state of the falling slag blocks to change the crushing mode, thereby ensuring the stable operation of the steel belt conveyor without overload problems, avoiding the possibility of human error operation, and ensuring the stability of equipment operation.

[0056] The present invention can realize automatic slag squeezing of each slag well of the boiler slag discharge system, and the three slag wells can also squeeze slag together in sequence. The number of slag squeezing times of the slag wells can be flexibly controlled, thereby ensuring the crushing capacity of the extrusion head.

[0057] The present invention is suitable for the condition of starting the extrusion head after the slag discharge system has been shut down for a long time, and is also suitable for the condition of boiler coke dropping and slag extrusion by adjusting the slag discharge interval time. It does not require personnel to stay on site for a long time to observe the amount of slag in the steel strip, thus avoiding the risk of high-temperature scalding.

[0058] When the open position signal is detected during the operation of the extrusion head or the system oil pressure is greater than the first system oil pressure value, the extrusion head loses power. This can prevent the extrusion head from being immobilized by the resistance of the coke block and the solenoid valve from being energized for a long time and burning, thus saving maintenance costs.

[0059] After the slag discharge system trips, the present invention can switch to the dry slag discharge tripping linkage sequential control without disturbance, thereby ensuring safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 This is a flow chart of a control method for automatic slag squeezing of a boiler in an embodiment of the present application;

[0061] Figure 2 It is a schematic diagram of a control device for automatic slag extrusion of a boiler in an embodiment of the present application. DETAILED DESCRIPTION

[0062] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0063] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0064] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0065] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0066] like Figure 1 As shown, a preferred embodiment of the present invention provides a control method for automatic slag squeezing of a boiler, comprising:

[0067] Step 1: Turn on the automatic monitoring mode, detect and capture the fallen slag blocks, and determine the slag pit number where the slag blocks fell;

[0068] Step 2: Select the sequential slag well number and preset the slag extrusion times and slag discharge interval time;

[0069] Step 3: Start the hydraulic oil unit and the extrusion head sequence control program to crush the slag blocks in sequence, and stop the hydraulic oil unit after the crushing is completed.

[0070] Specifically, starting the hydraulic oil unit includes: opening the main oil return solenoid valve; starting the selected hydraulic oil pump; and checking that the system oil pressure is greater than 10MPa.

[0071] Specifically, shutting down the hydraulic oil unit includes: cutting off the hydraulic oil pump interlock; shutting down the running hydraulic oil pump; closing the return oil main solenoid valve; checking that the system oil pressure is less than 0.1MPa; and ending sequential control.

[0072] In some embodiments of the present application, step 2 specifically includes: presetting the slag pit slag squeezing sequence;

[0073] According to the number of the slag well where the slag blocks fall, the slag well number that needs to be controlled is selected, and the slag blocks are broken in the selected slag well according to the preset slag extrusion sequence.

[0074] Specifically, the sequential control program defaults to putting three slag shaft slag extrusion programs into operation at the same time. There is a selection box in front of each slag shaft number. Click the "√" in the selection box and then click "Automatically confirm". The action sequence of the extrusion head in the slag shaft will be cut off, and the extrusion head will not move in this automatic crushing program. The remaining extrusion heads will start crushing in the order of slag shaft No. 3, slag shaft No. 2, and slag shaft No. 1.

[0075] In some embodiments of the present application, step 2 further includes:

[0076] A steel strip buffer bucket temperature matrix C (C1, C2, C3) is preset, wherein C1 is a preset value of the first steel strip buffer bucket temperature; C2 is a preset value of the second steel strip buffer bucket temperature; C3 is a preset value of the third steel strip buffer bucket temperature; and C1<C2<C3;

[0077] Get the real-time temperature c of the steel strip buffer hopper. When it is less than temperature C1, the extrusion head will be opened sequentially. When the actual temperature c of the steel strip buffer hopper is greater than C3, the extrusion head will stop opening and maintain the current opening.

[0078] Preset extrusion head opening time interval matrix T (T1, T2, T3), wherein T1 is the preset value of the first extrusion head opening time interval; T2 is the preset value of the second extrusion head opening time interval; T3 is the preset value of the third extrusion head opening time interval; and T1<T2<T3;

[0079] The real-time temperature c of the steel strip buffer bucket is obtained, and the real-time extrusion head opening time interval t is determined according to the relationship between the preset steel strip buffer bucket temperature matrix C and the preset extrusion head opening time interval matrix T, as follows:

[0080] When the real-time temperature c of the steel strip buffer hopper is c<C1, the real-time extrusion head opening time interval t is set to the first extrusion head opening time interval preset value T1, that is, t=T1;

[0081] When the real-time temperature c of the steel strip buffer bucket is C1≤c<C2, the real-time extrusion head opening time interval t is set to the second extrusion head opening time interval preset value T2, that is, t=T2;

[0082] When the real-time temperature c of the steel strip buffer bucket is C2≤c<C3, the real-time extrusion head opening time interval t is set to the third extrusion head opening time interval preset value T3, that is, t=T3.

[0083] Specifically, the extrusion head opening time interval matrix T can be an arithmetic progression. After inputting the time interval T1, the following T can be calculated based on the tolerance. △ t is automatically generated.

[0084] Specifically, by presetting the steel belt buffer bucket temperature matrix C and the extrusion head opening time interval matrix T, and obtaining the real-time temperature c of the steel belt buffer bucket, the amount of slag on the steel belt conveyor is judged, and the real-time extrusion head opening time interval t is determined to ensure the stable operation of the steel belt and avoid shutdown due to steel belt slippage.

[0085] In some embodiments of the present application, step 2 further includes:

[0086] Dynamically adjust the slag discharge interval time. After adjusting the slag discharge interval time, the extrusion head in the step sequence obtains the adjusted slag discharge interval time before the next power-on action.

[0087] Specifically, the slag discharge interval is the time interval between the opening of the extrusion head;

[0088] Specifically, the input slag discharge interval is the interval time (seconds) after each extrusion head retracts once. It can be adjusted manually at any time according to the actual situation. There are 18 extrusion heads in the three slag pits of the boiler, and the time from opening to closing of each extrusion head is 9s. The hardness of the slag block will affect the actual stroke time of the extrusion head, but the actual error is less than 2s. Therefore, the design of each extrusion head control solenoid valve is divided into 5 times of power-on to complete the opening of a single stroke. If the slag discharge interval is 0, the extrusion head is opened once. The first 4 times the solenoid valve is powered on for 2s, the extrusion head maintains the current position. When the fifth excitation power-on lasts for 3s or the extrusion head is in place or the system oil pressure is greater than 10MPa, the extrusion head solenoid valve loses power to ensure that the extrusion head can be fully retracted. When the amount of slag in the grille is large, the extrusion head waits for 4 times after each continuous power-on action, and automatically accepts the interval time separately each time. After the waiting time ends, the next power-on action is performed.

[0089] In some embodiments of the present application, the extrusion head sequential control program is specifically as follows:

[0090] Step a: Open the main solenoid valve of the extrusion head extension cylinder, detect in sequence whether the slag well is selected according to the preset slag well extrusion sequence, and close the extrusion heads of the selected slag wells in sequence and then close the main solenoid valve of the extrusion head extension cylinder;

[0091] Step b: open the main solenoid valve of the extrusion head retraction cylinder, detect whether the slag well is selected according to the preset slag well extrusion sequence, open the extrusion heads of the selected slag wells in turn, then close the main solenoid valve of the extrusion head retraction cylinder, cut off this sequence control, and start the dry slag discharge tripping linkage sequence control.

[0092] Preset the first system oil pressure value and the second system oil pressure value;

[0093] Specifically, the first system oil pressure value is the solenoid valve de-energizing pressure, and the second system oil pressure value is the system sequential control ending oil pressure.

[0094] Specifically, closing the extrusion head in step a is as follows:

[0095] When it is detected that the real-time system oil pressure is higher than the first system oil pressure value for several seconds, the extrusion head loses power and maintains the current position;

[0096] When it is detected that the real-time system oil pressure is lower than the second system oil pressure value for several seconds, the program control ends.

[0097] Specifically, opening the extrusion head in step b is as follows:

[0098] The electromagnetic is controlled to be energized n times to complete the opening of a single extrusion head.

[0099] In some embodiments of the present application, step b further includes:

[0100] The duration of the first n-1 energized actions is the preset value of the first energized time, and the extrusion head maintains the current position;

[0101] When the duration of the nth energization action reaches the second energization time preset value and the extrusion head is fully opened or the real-time system oil pressure is higher than the first system oil pressure value, the extrusion head solenoid valve loses power.

[0102] In some embodiments of the present application, step three further includes:

[0103] Obtain a preset number of slag extrusion times, and cyclically execute step a and step b according to the preset number of slag extrusion times.

[0104] Specifically, manually input the number of times (a natural number from 1 to 20, 2 times by default) in the "Number of slag extrusions" box, and cycle the extrusion head on and off several times according to the set number of slag extrusions to ensure that the slag blocks on the grille are completely crushed.

[0105] like Figure 2As shown, in some preferred embodiments of the present application, a control device for automatic slag squeezing of a boiler is provided, comprising:

[0106] The detection unit is arranged at the boiler slag well observation well, and is used to capture the slag block falling trajectory and determine the slag well number where the slag block falls;

[0107] The central control unit is used to obtain the slag pit number determined by the detection unit and select the slag pit number to start the sequential control program;

[0108] Control unit, used to set the number of slag extrusions and the interval time of slag discharge;

[0109] Hydraulic oil unit, the hydraulic oil unit controls the movement of the extrusion head according to the sequential control program.

[0110] Specifically, the hydraulic oil unit includes:

[0111] Oil return main solenoid valve;

[0112] Extrusion head extension cylinder main solenoid valve;

[0113] Extrusion head retraction cylinder main solenoid valve;

[0114] Several extrusion head solenoid valves and several hydraulic oil pumps.

[0115] According to Example 1 of the present application, the extrusion head sequential control procedure is:

[0116] Select three slag pits, input the setting that each extrusion head will be opened 5 times, and the operator inputs "opening interval 20s, cycle slag extrusion 2 times".

[0117] The program-controlled slag extrusion starts and is confirmed.

[0118] Start the selected oil pump and check that the system unit oil pressure is greater than the first system oil pressure value (10Mpa).

[0119] S1 opens the main solenoid valve SEGZ of the extrusion head extension cylinder.

[0120] S2 detects whether slag pit No. 3 is selected. If not, jump to step S9.

[0121] S3 Close the No. 1 extrusion head 31Q on the front wall of No. 3 slag pit.

[0122] S3-1 The extrusion head 31Q is powered on and it is detected that the extrusion head is opened to the right position or the system oil pressure is higher than the first system oil pressure value for more than 2s. The extrusion head 31Q is powered off and maintains the current position.

[0123] S4 Close No. 1 extrusion head 31H on the rear wall of No. 3 slag pit

[0124] S5 closes the No. 2 extrusion head 32Q on the front wall of No. 3 slag pit.

[0125] S6 Close the No. 2 extrusion head 32H on the rear wall of No. 3 slag pit.

[0126] S7 closes the No. 3 extrusion head 33Q on the front wall of No. 3 slag pit.

[0127] S8 closes the No. 3 extrusion head 33H on the rear wall of No. 3 slag pit.

[0128] S9 detects whether slag pit No. 2 is selected. If not, jump to step S16.

[0129] S10 Close the No. 1 extrusion head 21Q on the front wall of No. 2 slag pit.

[0130] S11 Close the No. 1 extrusion head 21H on the rear wall of No. 2 slag pit.

[0131] S12 Close the No. 2 extrusion head 22Q on the front wall of No. 2 slag pit.

[0132] S13 closes the No. 2 extrusion head 22H on the rear wall of the No. 2 slag pit.

[0133] S14 closes the No. 3 extrusion head 23Q on the front wall of No. 2 slag pit.

[0134] S15 closes the No. 3 extrusion head 23H on the rear wall of No. 2 slag pit.

[0135] S16 detects whether slag pit No. 1 is selected. If not, jump to step S23.

[0136] S17 closes the No. 1 extrusion head 11Q on the front wall of No. 1 slag pit.

[0137] S18 closes the No. 1 extrusion head 11H on the rear wall of No. 1 slag pit.

[0138] S19 closes the No. 2 extrusion head 12Q on the front wall of No. 1 slag pit.

[0139] S20 Close the No. 2 extrusion head on the rear wall of No. 1 slag pit for 12H.

[0140] S21 Close the No. 3 extrusion head 13Q on the front wall of No. 1 slag pit.

[0141] S22 Close the No. 3 extrusion head 13H on the rear wall of No. 1 slag pit.

[0142] S23 closes the main solenoid valve SEGZ of the extrusion head extension cylinder.

[0143] S24 opens the main solenoid valve SUGZ of the extrusion head retraction cylinder.

[0144] S25 detects whether slag pit No. 3 is selected. If not, jump to step S32.

[0145] S26 opens the No. 1 extrusion head 31Q on the front wall of No. 3 slag pit.

[0146] S26-1 The first start of the extrusion head 31Q lasts for the first power-on time, and waits for 20 seconds (the waiting time is the slag discharge interval time, which can be modified). During the interval time, if the temperature of the steel strip buffer bucket is greater than 250℃, the delay is 5s, and the extrusion head stops moving, or the temperature is less than 150℃, and the extrusion head executes the next step.

[0147] Specifically, when the real-time temperature of the steel strip buffer bucket is less than 150°C, the extrusion head sequential control starts;

[0148] When the real-time temperature of the steel strip buffer bucket is less than 150°C, the extrusion head opening time interval is 20s

[0149] When the real-time temperature of the steel strip buffer bucket is between 150°C and 200°C, the extrusion head is opened for 80 seconds, and the extrusion head executes the next step.

[0150] When the real-time temperature of the steel strip buffer bucket is between 200°C and 250°C, the extrusion head is opened for a time interval of 140s, and the extrusion head executes the next step.

[0151] When the real-time temperature of the steel strip buffer is greater than 250°C, the extrusion head stops opening and maintains the current opening. When the temperature is less than 150°C, the extrusion head executes the next step.

[0152] S26-2 Waiting timer ends, extrusion head 31Q opens for the second time and continues for the first power-on time, waiting for 20 seconds. During the interval, if the temperature of the steel strip buffer bucket is greater than 250℃, the delay is 5s, and the extrusion head stops moving. If the temperature is less than 150℃, the extrusion head executes the next step.

[0153] S26-3 Waiting timer ends, extrusion head 31Q starts for the third time and lasts for the first power-on time, waiting for 20 seconds. During the interval, if the temperature of the steel strip buffer bucket is greater than 250℃, the delay is 5s, and the extrusion head stops moving. If the temperature is less than 150℃, the extrusion head executes the next step.

[0154] S26-4 Waiting timer ends, extrusion head 31Q starts for the fourth time and continues for the first power-on time, waiting for 20 seconds. During the interval, if the temperature of the steel strip buffer bucket is greater than 250℃, the delay is 5s, and the extrusion head stops moving. If the temperature is less than 150℃, the extrusion head executes the next step.

[0155] S26-5 Waiting time ends, the extrusion head 31Q is powered on for the fifth time and opens in 3s, or the system oil pressure is higher than the first oil pressure setting value for more than 0.5s when powered on, and the extrusion head 31Q opens.

[0156] S27 opens the No. 1 extrusion head 31H on the rear wall of No. 3 slag pit.

[0157] S28 opens the No. 2 extrusion head 32Q on the front wall of No. 3 slag pit.

[0158] S29 opens the No. 2 extrusion head 32H on the rear wall of No. 3 slag pit.

[0159] S30 opens the No. 3 extrusion head 33Q on the front wall of the No. 3 slag pit.

[0160] S31 opens the No. 3 extrusion head 33H on the rear wall of the No. 3 slag pit.

[0161] S32 detects whether slag pit No. 2 is selected. If not, jump to step S39.

[0162] S33 opens the No. 1 extrusion head 21Q on the front wall of the No. 2 slag pit.

[0163] S34 opens the No. 1 extrusion head 21H of the rear wall of the No. 2 slag pit.

[0164] S35 opens the No. 2 extrusion head 22Q on the front wall of the No. 2 slag pit.

[0165] S36 opens the No. 2 extrusion head 22H on the rear wall of the No. 2 slag pit.

[0166] S37 opens the No. 3 extrusion head 23Q on the front wall of No. 2 slag pit.

[0167] S38 opens the No. 3 extrusion head 23H on the rear wall of the No. 2 slag pit.

[0168] S39 detects whether slag pit No. 1 is selected. If not, jump to step S46.

[0169] S40 opens the No. 1 extrusion head 11Q on the front wall of the No. 1 slag pit.

[0170] S41 opens the No. 1 extrusion head 11H on the rear wall of the No. 1 slag pit.

[0171] S42 opens the No. 2 extrusion head 12Q on the front wall of the No. 1 slag pit.

[0172] S43 opens the No. 2 extrusion head on the rear wall of No. 1 slag pit for 12H.

[0173] S44 opens the No. 3 extrusion head 13Q on the front wall of No. 1 slag pit.

[0174] S45 opens the No. 3 extrusion head 13H on the rear wall of No. 1 slag pit.

[0175] S46 closes the main solenoid valve SUGZ of the extrusion head retraction cylinder.

[0176] After the S47 system detects the tripping signal of the dry slag discharge system, it executes step S46: closes the main electromagnetic valve SUGZ of the extrusion head retraction cylinder, cuts off this sequence control, and starts the dry slag discharge tripping linkage sequence control.

[0177] S48 detects the number of slag squeezing times, and executes steps S1 to S46 cyclically until the hydraulic oil unit is shut down after N cycles.

[0178] According to the first concept of this application, the ordinary camera at the boiler slag well observation window is replaced with an infrared temperature measuring camera. According to the high temperature of the large slag blocks falling, the slag blocks of a certain size are captured and located in a certain slag well. The slag well number is automatically detected and selected, and the sequential control program is started. The extrusion head in the slag well area can be automatically started for crushing, which reduces the workload of personnel.

[0179] According to the second concept of the present application, by presetting the steel belt buffer bucket temperature matrix C and the extrusion head opening time interval matrix T, by obtaining the real-time temperature c of the steel belt buffer bucket, the amount of slag on the steel belt conveyor is judged, and the real-time extrusion head opening time interval t is determined to ensure the stable operation of the steel belt and avoid shutdown due to steel belt slippage.

[0180] According to the third concept of the present application, the slag well number that needs to be subjected to the sequential control procedure is selected according to the slag well number where the slag blocks fall, and the slag blocks of the selected slag well are broken according to the preset slag squeezing sequence, so that each slag well can be automatically squeezed slag separately, and the three slag wells can also be squeezed slag sequentially together, and the number of slag squeezing times of the slag well can be flexibly controlled to ensure the crushing capacity of the extrusion head.

[0181] According to the fourth concept of the present application, by dynamically adjusting the slag discharge interval time, the problem of opening the extrusion head after the slag system has been shut down for a long time and the problem of boiler coke dropping and slag extrusion is solved. There is no need for personnel to stay on site for a long time to observe the amount of slag in the steel strip, thus avoiding the risk of high-temperature burns.

[0182] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A control method for automatic slag squeezing of boilers, It is characterized in that include: Step 1: Turn on the automatic monitoring mode, detect and capture the fallen slag blocks, and determine the slag pit number where the slag blocks fell; Step 2: Select the sequential slag well number and preset the slag extrusion times and slag discharge interval time; Step 3: Start the hydraulic oil unit and the extrusion head sequential control program to crush the slag blocks in sequence, and stop the hydraulic oil unit after the crushing is completed; The step 2 is specifically as follows: Preset the slag extrusion sequence of the slag pit; According to the number of the slag well where the slag blocks fall, the number of the slag well that needs to be controlled is selected, and the slag blocks are broken in the selected slag well according to the preset slag squeezing sequence; The step 2 also includes: A steel strip buffer bucket temperature matrix C (C1, C2, C3) is preset, wherein C1 is a preset value of the first steel strip buffer bucket temperature; C2 is a preset value of the second steel strip buffer bucket temperature; C3 is a preset value of the third steel strip buffer bucket temperature; and C1<C2<C3; Get the real-time temperature c of the steel strip buffer hopper. When it is less than temperature C1, the extrusion head is sequentially controlled to open. When the real-time temperature c of the steel strip buffer hopper is greater than C3, the extrusion head stops opening and maintains the current opening. Preset extrusion head opening time interval matrix T (T1, T2, T3), wherein T1 is the preset value of the first extrusion head opening time interval; T2 is the preset value of the second extrusion head opening time interval; T3 is the preset value of the third extrusion head opening time interval; and T1<T2<T3; The real-time temperature c of the steel strip buffer bucket is obtained, and the real-time extrusion head opening time interval t is determined according to the relationship between the preset steel strip buffer bucket temperature matrix C and the preset extrusion head opening time interval matrix T, as follows: When the real-time temperature c of the steel strip buffer hopper is c<C1, the real-time extrusion head opening time interval t is set to the first extrusion head opening time interval preset value T1, that is, t=T1; When the real-time temperature c of the steel strip buffer bucket is C1≤c<C2, the real-time extrusion head opening time interval t is set to the second extrusion head opening time interval preset value T2, that is, t=T2; When the real-time temperature c of the steel strip buffer bucket is C2≤c<C3, the real-time extrusion head opening time interval t is set to the third extrusion head opening time interval preset value T3, that is, t=T3; The step 2 also includes: Dynamically adjust the slag discharge interval time. After adjusting the slag discharge waiting interval time, the extrusion head in the step sequence obtains the adjusted slag discharge waiting interval time before the next power-on action.

2. The control method for automatic slag squeezing of a boiler according to claim 1, It is characterized in that The extrusion head sequential control program is specifically as follows: Step a: Open the main solenoid valve of the extrusion head extension cylinder, detect in sequence whether the slag well is selected according to the preset slag well extrusion sequence, and close the extrusion heads of the selected slag wells in sequence and then close the main solenoid valve of the extrusion head extension cylinder; Step b: open the main solenoid valve of the extrusion head retraction cylinder, detect whether the slag well is selected according to the preset slag well extrusion sequence, open the extrusion heads of the selected slag wells in turn, then close the main solenoid valve of the extrusion head retraction cylinder, cut off this sequence control, and start the dry slag discharge tripping linkage sequence control.

3. The control method for automatic slag squeezing of a boiler according to claim 2, It is characterized in that The step three also includes: Preset the first system oil pressure value and the second system oil pressure value; Closing the extrusion head in step a is specifically as follows: When it is detected that the real-time system oil pressure is higher than the first system oil pressure value for several seconds, the extrusion head loses power and maintains the current position; When it is detected that the real-time system oil pressure is lower than the second system oil pressure value for several seconds, the program control ends; Opening the extrusion head in step b specifically includes: The electromagnetic is controlled to be energized n times to complete the opening process of a single extrusion head.

4. The control method for automatic slag squeezing of a boiler according to claim 3, It is characterized in that The step b also includes: The duration of the first n-1 energized actions is the preset value of the first energized time, and the extrusion head maintains the current position; When the duration of the nth energization action reaches the second energization time preset value and the solenoid valve is fully opened or the real-time system oil pressure is higher than the first system oil pressure value, the extrusion head solenoid valve loses power.

5. The control method for automatic slag squeezing of a boiler according to claim 4, It is characterized in that The step three also includes: Obtain a preset number of slag extrusion times, and cyclically execute step a and step b according to the preset number of slag extrusion times.

6. A control device for automatic slag extrusion of a boiler, using the control method for automatic slag extrusion of a boiler as claimed in any one of claims 1 to 5. It is characterized in that include: The detection unit is arranged at the boiler slag pit observation well, and is used to capture the fallen slag blocks and determine the slag pit number where the slag blocks fell; A central control unit is used to obtain the slag pit number determined by the detection unit and select the slag pit number to start the sequential control program; Control unit, used to set the number of slag extrusions and the interval time of slag discharge; A hydraulic oil unit controls the movement of the extrusion head according to a sequential control program.

7. The control device for automatic slag squeezing of a boiler according to claim 6, It is characterized in that The hydraulic oil unit comprises: Oil return main solenoid valve; Extrusion head extension cylinder main solenoid valve; Extrusion head retraction cylinder main solenoid valve; Several extrusion head solenoid valves and several hydraulic oil pumps.

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