Ash continuous weighing structure of dry type slag discharging system

Abstract

The utility model discloses an ash continuous weighing structure of a dry-type slag discharge system, the dry-type slag discharge system is located below an ash channel, comprises a steel belt conveying structure, and is supported and connected by a head driving structure and a tail redirection structure to realize circulating transmission, the head driving structure is connected with a variable frequency motor and a frequency converter, and the tail redirection structure is connected with a tail redirection structure. The tail redirection structure is connected with a speed sensor, the speed sensor is connected with a PLC, and frequency conversion is controlled through the PLC. The continuous weighing structure comprises supporting structures erected on the two sides of the steel belt conveying structure, the supporting structures are provided with an upper-layer weighing assembly and a lower-layer weighing assembly respectively corresponding to the upper-layer conveying structure and the lower-layer conveying structure at the same vertical position of the steel belt conveying structure, the upper-layer weighing assembly and the lower-layer weighing assembly are connected with a PLC respectively, and the upper-layer weighing structure and the lower-layer weighing structure are transmitted to the PLC. According to the utility model, the weight result of ash can be obtained in real time, the speed of the belt type conveying structure can be adjusted in real time according to the result, and good energy-saving and consumption-reducing functions are achieved.

Description

Technical Field

[0001] The utility model belongs to the field of dry slag discharge of coal-fired boilers, and particularly relates to a continuous ash and slag weighing structure for a dry slag discharge system. Background Technique

[0002] The dry slag discharge system is mainly applied to the bottom of a coal-fired boiler and is a steel belt conveying structure and accessories for conveying the ash and slag generated by the coal-fired boiler to a slag bin. The system mainly includes a steel belt conveying structure, a head driving structure, a tail redirecting structure, a standard section structure, etc. The head driving structure provides driving power for the system, usually in the form of a motor + reducer + drive shaft. The tail section realizes the redirection of the steel belt conveying structure. The standard section is installed between the head section and the tail section, and the quantity and size can be determined according to the on-site situation, so as to realize the implementation of a dry slag discharge system with any length. The ash and slag at the bottom of the boiler fall onto the steel belt conveying structure, and the steel belt conveying structure, through the head driving structure, conveys the ash and slag to the slag storage bin, thus realizing the conveying function of the bottom slag of the coal-fired boiler.

[0003] This dry slag discharge system works in a high-temperature and high-dust environment. The equipment needs to have high stability to ensure the safe and reliable operation of the boiler. The equipment body has a certain degree of airtightness to ensure that the air intake of the dry slag discharge system does not reduce the boiler combustion efficiency.

[0004] At present, the research on the ash and slag weight monitoring of the dry slag discharge system is still blank, and there is no equipment application for the ash and slag quality monitoring structure and method at the bottom of the furnace. The steel belt conveying structure adopts a driving form of a motor + reducer. The motor can be an ordinary motor or a frequency conversion motor. However, no matter what kind of motor form is adopted, the steel belt conveying structure cannot adjust the speed according to the actual weight of the ash and slag, and cannot meet the requirements of reducing energy consumption or increasing efficiency of the dry slag discharge system. Summary of the Invention

[0005] Purpose of the utility model: To solve the technical problems raised in the background technique, the utility model discloses a continuous ash and slag weighing structure for a dry slag discharge system.

[0006] Technical solution: The continuous ash and slag weighing structure for the dry slag discharge system disclosed by the utility model is located below the ash channel and includes a steel belt conveying structure, which is supported and connected by a head driving structure and a tail redirecting structure to realize circular transmission. The head driving structure is connected to a frequency conversion motor and a frequency converter, the tail redirecting structure is connected to a speed sensor, and the speed sensor is connected to a PLC to control the frequency conversion through the PLC;

[0007] The continuous weighing structure includes a support structure erected on both sides of the steel belt conveying structure. The support structure is respectively provided with an upper weighing assembly and a lower weighing assembly corresponding to the upper conveying structure and the lower conveying structure at the same vertical position of the steel belt conveying structure, and is respectively connected to the PLC to transmit the weighing structures of the upper and lower layers to the PLC.

[0008] Further, the support structure is located directly below the ash duct.

[0009] Further, the upper weighing assembly includes weighing idler supports fixed to the support structure and extending parallel to the upper conveying structure. The weighing idlers are respectively mounted on the weighing idler supports on both sides through the two ends of the weighing tray. A roller pressure sensor is provided between the end of the weighing idler and the weighing idler support. The weighing idler is in close contact with the bottom of the chain belts on both sides of the upper conveying structure to measure the downward pressure of the upper conveying structure loaded with ash and slag. The roller pressure sensor is connected to the PL.

[0010] Further, the lower weighing assembly includes weighing wheel supports provided on the support structure and extending parallel to the lower conveying structure. Weighing trays are provided on both of the weighing wheel supports. A wheel pressure sensor is provided between the weighing wheel and the weighing wheel support. The weighing tray is in close contact with the upper surface of the chain belts on both sides of the lower conveying structure to measure the downward pressure of the lower conveying structure without loaded ash and slag. The wheel pressure sensor is connected to the PLC.

[0011] Further, both the weighing idler and the weighing wheel are fixed to their respective supports through bearing seats at the ends.

[0012] Further, the upper weighing assembly includes a plurality of weighing idlers and roller pressure sensors, which are arranged at intervals on the weighing idler supports. The lower weighing assembly includes a plurality of weighing wheels and wheel pressure sensors, and the weighing wheels and wheel pressure sensors are respectively vertically corresponding to the weighing idlers and roller pressure sensors.

[0013] Further, a height adjustment mechanism is further included, and the height adjustment mechanism includes an adjustment support base, a hydraulic cylinder and an adjustment lead screw;

[0014] The adjustment support base is located above the weighing idler support and fixed to the support structure. One end of the hydraulic cylinder is fixed to the adjustment support base, and the other end is fixed to the weighing idler support. The bottom of the weighing idler support is connected to the weighing wheel support through the adjustment lead screw. The height position of the weighing idler support is adjusted by the hydraulic cylinder, and then the height position of the weighing wheel support is adjusted by the adjustment lead screw;

[0015] The height adjustment mechanism is respectively arranged at both ends of the weighing idler supports on both sides.

[0016] Further, a soft seal assembly is provided between the support structure and the weighing idler support and the weighing wheel support.

[0017] The speed regulation method using the ash and slag continuous weighing structure of the above dry slag removal system includes the following steps:

[0018] S1. Adjust the weighing idler and weighing pulley through the height adjustment mechanism to adapt to the height positions of the upper conveying structure and the lower conveying structure;

[0019] S2. When the equipment operates, in the initial state, the frequency conversion motor drives the head drive structure to operate at the lowest initial speed;

[0020] The PLC judges the ash slag quality through the numerical difference between the idler pressure sensor and the pulley pressure sensor, controls the frequency converter and the frequency conversion motor according to the ash slag quality, so as to control the steel belt conveying speed. The more ash slag there is, the faster the conveying speed is.

[0021] Beneficial effects: Compared with the prior art, the utility model: 1. Can obtain the weight result of the ash slag in real time and adjust the speed of the belt conveying structure in real time according to this result, with good energy-saving and consumption-reducing functions; 2. The height is adjustable, the structure is simple, and it can be installed at any position in the standard section of the dry slag discharge system, which can not only meet new projects, but also be suitable for the transformation of existing projects. Brief description of the drawings

[0022] Figure 1 It is the overall structure diagram of the utility model;

[0023] Figure 2 It is the front view of the continuous weighing structure of the utility model;

[0024] Figure 3 It is the side view of the continuous weighing structure of the utility model;

[0025] Figure 4 It is the side view of the height adjustment mechanism of the utility model. Detailed implementation manners

[0026] The following further describes the utility model in conjunction with the drawings and detailed implementation manners.

[0027] As Figure 1 shown in the continuous weighing structure of the ash slag of the dry slag discharge system, the dry slag discharge system is located below the ash channel 1, includes a steel belt conveying structure 2, and realizes circular transmission through the support connection of the head drive structure 3 and the tail redirecting structure 4. The head drive structure 3 is connected to a frequency conversion motor 5 and a frequency converter 6. The tail redirecting structure 4 is connected to a speed sensor 7, and the speed sensor 7 is connected to a PLC8, and the frequency converter 6 is controlled by the PLC8;

[0028] The continuous weighing structure includes a support structure 9 erected on both sides of the steel belt conveying structure 2. The support structure 9 is respectively provided with an upper weighing assembly and a lower weighing assembly corresponding to the upper conveying structure 201 and the lower conveying structure 202 at the same vertical position of the steel belt conveying structure 2, and is respectively connected to the PLC 8 to transmit the weighing structures of the upper and lower layers to the PLC 8.

[0029] The support structure 9 is also located directly below the ash chute 1.

[0030] As Figure 2 and 3 As shown, the upper weighing assembly includes a weighing idler support 10. The weighing idler support 10 is fixed on the support structure 9 and extends parallel to the upper conveying structure 201. The two ends of the weighing idler 11 are respectively erected on the weighing idler supports 10 on both sides. A roller pressure sensor 12 is provided between the end of the weighing idler 11 and the weighing idler support 10. The weighing idler 11 is closely attached to the bottom of the chain belts on both sides of the upper conveying structure 201 to measure the downward pressure of the upper conveying structure 201 loaded with ash and slag. The roller pressure sensor 12 is connected to the PLC 8.

[0031] The lower weighing assembly includes a weighing wheel support 13. The weighing wheel support 13 is arranged on the support structure 9 and extends parallel to the lower conveying structure 202. Weighing wheels 14 are provided on both sides of the weighing wheel support 13. A wheel pressure sensor 15 is provided between the weighing wheel 14 and the weighing wheel support 13. The weighing wheel 14 is closely attached to the upper surface of the chain belts on both sides of the lower conveying structure 202 to measure the downward pressure of the lower conveying structure 202 not loaded with ash and slag. The wheel pressure sensor 15 is connected to the PLC 8.

[0032] The weighing idlers 11 and the weighing wheels 14 are both fixed to their respective supports through bearing seats at the ends, ensuring that the weighing idlers 11 and the weighing wheels 14 are in rolling contact with the chain belts.

[0033] The upper weighing assembly includes a plurality of weighing idlers 11 and roller pressure sensors 12, which are arranged at intervals on the weighing idler support 10. The lower weighing assembly includes a plurality of weighing wheels 14 and wheel pressure sensors 15. The weighing wheels 14 and the wheel pressure sensors 15 correspond to the weighing idlers 11 and the roller pressure sensors 12 in the vertical position.

[0034] As Figure 4 As shown, it further includes a height adjustment mechanism. The height adjustment mechanism includes an adjustment support base 16, a hydraulic cylinder 17 and an adjustment lead screw 18;

[0035] The adjusting support base 16 is located above the weighing idler support 10 and fixed to the support structure 9. One end of the hydraulic cylinder 17 is fixed to the adjusting support base 16, and the other end is fixed to the weighing idler support 10. The bottom of the weighing idler support 10 is connected to the weighing idler wheel support 13 through an adjusting lead screw 18. The height position of the weighing idler support 10 is adjusted by the hydraulic cylinder 17, and then the height position of the weighing idler wheel support 13 is adjusted by the adjusting lead screw 18.

[0036] The height adjusting mechanism is respectively arranged at both ends of the weighing idler supports 10 on both sides to ensure the position accuracy of the belt conveying structure in the height direction, thereby ensuring the accuracy of the material quality data.

[0037] A soft seal assembly 19 is provided between the support structure 9, the weighing idler support 10, and the weighing idler wheel support 13. The soft seal assembly 19 can not only ensure the proper displacement of the weighing idler support 10 and the weighing idler wheel support 13, but also ensure the overall sealing performance of the support structure to avoid boiler air leakage.

[0038] The speed regulation method of the ash and slag continuous weighing structure of the above dry slag removal system includes the following steps:

[0039] First, the height adjusting mechanism is used to adjust the weighing idlers 11 and the weighing idler wheels 14 to adapt to the height positions of the upper conveying structure 201 and the lower conveying structure 202.

[0040] In the initial state, the mass of the ash and slag is 0. The frequency converter 6 outputs the minimum set frequency, and the variable frequency motor 5 rotates at a constant speed at the minimum design speed, driving the head drive structure 3 to drive the steel belt conveying structure 2 to run at the minimum initial speed.

[0041] When the ash and slag fall into the steel belt conveying structure 2 and the mass of the ash and slag gradually increases, the PLC obtains the current ash and slag mass signal and the speed signal of the speed sensor 7. As time accumulates, when the mass of the ash and slag gradually increases to the set value, the PLC outputs a signal, the frequency of the frequency converter 6 increases, the speed of the variable frequency motor 5 increases, and the speed of the steel belt conveying structure 2 increases.

[0042] When the mass of the ash and slag falling into the steel belt conveying structure 2 decreases, the PLC obtains the current ash and slag mass and the speed signal of the speed sensor 7. When the mass of the ash and slag gradually decreases to the set value, the PLC outputs a signal, the frequency of the frequency converter 6 decreases, the speed of the variable frequency motor 5 decreases, and the speed of the steel belt conveying structure 2 slows down.

[0043] Through the above control method, the system can convert the real-time mass signal of the ash and slag into the speed signal of the steel belt conveying structure, so as to realize the real-time correspondence between the continuous weighing result and the speed.

Claims

1. A dry slag discharge system ash continuous weighing structure, characterized by: The dry slag discharge system is located below the ash channel (1), comprises a steel belt conveying structure (2), and is supported and connected by a head driving structure (3) and a tail redirecting structure (4) to achieve cyclic transmission, wherein the head driving structure (3) is connected to a variable frequency motor (5) and a frequency converter (6), the tail redirecting structure (4) is connected to a speed sensor (7), the speed sensor (7) is connected to a PLC (8), and the frequency converter (6) is controlled by the PLC (8); The continuous weighing structure comprises a support structure (9) erected on both sides of the steel belt conveying structure (2), wherein the support structure (9) is provided with an upper weighing component and a lower weighing component respectively on an upper conveying structure (201) and a lower conveying structure (202) at the same vertical position of the steel belt conveying structure (2), and is respectively connected to a PLC (8) to transmit the weighing structures of the upper and lower layers to the PLC (8).

2. The ash continuous weighing structure of the dry slag discharge system according to claim 1 is characterized by: The support structure (9) is located directly below the ash channel (1).

3. The ash continuous weighing structure of the dry slag discharge system according to claim 1 is characterized by: The upper weighing assembly comprises a weighing roller support (10), the weighing roller support (10) being fixed on the support structure (9) and extending parallel to the upper conveying structure (201), and the two ends of the weighing roller (11) being respectively mounted on the weighing roller support (10) on both sides, a roller pressure sensor (12) being provided between the end of the weighing roller (11) and the weighing roller support (10), the weighing roller (11) being closely attached to the bottom of the chain belts on both sides of the upper conveying structure (201), and measuring the downward pressure of the upper conveying structure (201) loaded with ash, and the roller pressure sensor (12) being connected to the PLC (8).

4. The ash continuous weighing structure of the dry slag discharge system according to claim 3 is characterized by: The lower weighing assembly comprises a weighing roller support (13), the weighing roller support (13) being arranged on the support structure (9) and extending parallel to the lower conveying structure (202), the weighing roller support (13) on both sides being provided with a weighing roller (14), a roller pressure sensor (15) being provided between the weighing roller (14) and the weighing roller support (13), the weighing roller (14) being closely attached to the upper surface of the chain belts on both sides of the lower conveying structure (202) to measure the downward pressure of the lower conveying structure (202) not loaded with ash, and the roller pressure sensor (15) being connected to the PLC (8).

5. The ash continuous weighing structure of the dry slag discharge system according to claim 4 is characterized in that: The weighing roller (11) and the weighing wheel (14) are both fixed to their respective support members via bearing seats at the ends.

6. The ash continuous weighing structure of the dry slag discharge system according to claim 4 is characterized by: The upper weighing assembly comprises a plurality of weighing rollers (11) and roller pressure sensors (12), which are arranged at intervals on the weighing roller support (10); the lower weighing assembly comprises a plurality of weighing rollers (14) and roller pressure sensors (15), and the weighing rollers (14) and roller pressure sensors (15) correspond to the vertical positions of the weighing rollers (11) and roller pressure sensors (12), respectively.

7. The ash continuous weighing structure of the dry slag discharge system according to claim 4 is characterized by: It also includes a height adjustment mechanism, which includes an adjustment support seat (16), a hydraulic cylinder (17) and an adjustment screw (18); The adjusting support seat (16) is located above the weighing roller support member (10) and is fixed to the supporting structure (9); one end of the hydraulic cylinder (17) is fixed to the adjusting support seat (16) and the other end is fixed to the weighing roller support member (10); the bottom of the weighing roller support member (10) is connected to the weighing roller support member (13) via an adjusting screw (18); the height position of the weighing roller support member (10) is adjusted via the hydraulic cylinder (17), and the height position of the weighing roller support member (13) is then adjusted via the adjusting screw (18); The height adjustment mechanisms are respectively arranged at both ends of the weighing roller support members (10) on both sides.

8. The ash continuous weighing structure of the dry slag discharge system according to claim 4 is characterized by: A soft sealing component (19) is provided between the support structure (9) and the weighing roller support component (10) and the weighing wheel support component (13).

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