System for improving recycling rate of sintering waste heat

Abstract

The utility model discloses a system for improving the recycling rate of sintering waste heat. The system comprises a sintering bin, the rear end of the sintering bin is communicated with the front end of the waste heat boiler through a connecting pipe, the upper end of the waste heat boiler is fixedly connected with evenly-distributed fixing pipes, the upper ends of the fixing pipes are communicated with the lower end of the same steam pipe, a steam outlet pipe is arranged at the upper end of the steam pipe, and a first temperature sensor is arranged at the front end of the steam outlet pipe. A temperature sensor II is arranged at the upper end of the connecting pipe; the system further comprises a control box, the control box is located on the right side of the waste heat boiler, a PLC is arranged in the control box, and the first temperature sensor and the second temperature sensor are both in two-way electric connection with the PLC. The system for improving the sintering waste heat recycling rate is rapid in control mode, short in response time, stable and reliable in work, simple in equipment structure, convenient to maintain and high in practicability. And the waste heat recycling rate of the sintering flue gas is greatly improved, so that the power generation load capacity of a generator set is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of improving the utilization rate of waste heat recovery, in particular to a system for improving the utilization rate of sintering waste heat recovery. Background Technique

[0002] The waste heat generating set is a set of production equipment that heats a boiler with the excess heat generated during the production process of a sintering machine for power generation. In the original production process, the frequency of the boiler induced draft fan was adjusted manually by the boiler operator according to the boiler steam temperature measured on the computer and the sintering machine flue gas outlet temperature, or the sintering machine operator adjusted the operation frequency of the induced draft fan by contacting the boiler operator by phone according to the operation condition of the sintering machine. Since there are many operating parameters monitored by the boiler generator set, the production rhythm of the sintering machine is fast and the communication is not timely, so the operation frequency of the induced draft fan often cannot be adjusted in time, resulting in too high or too low operating temperature of the sintering machine, and not all the effective heat of the sintering machine can be used for power generation, causing production chaos and energy waste. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is to overcome the existing defects, provide a system for improving the utilization rate of sintering waste heat recovery, with a fast control mode, a fast response time, stable and reliable operation, a simple equipment structure, convenient maintenance, greatly improving the utilization rate of sintering flue gas waste heat recovery, and thus greatly increasing the power generation load of the generating set, and can effectively solve the problems in the background technique.

[0004] To achieve the above object, the utility model provides the following technical solution: A system for improving the utilization rate of sintering waste heat recovery, including a sintering bin;

[0005] Sintering bin: Its rear end is communicated with the front end of the waste heat boiler through a connecting pipe. The upper end of the waste heat boiler is fixedly connected with uniformly distributed fixed pipes, and the upper ends of the fixed pipes are all communicated with the lower end of the same steam pipe. The upper end of the steam pipe is provided with a steam outlet pipe, and a temperature sensor I is arranged at the front end of the steam outlet pipe. A temperature sensor II is arranged at the upper end of the connecting pipe;

[0006] Among them: It also includes a control box. The control box is located on the right side of the waste heat boiler. A PLC controller is arranged inside the control box. The temperature sensor I and the temperature sensor II are both bidirectionally electrically connected to the PLC controller. The input end of the PLC controller is electrically connected to an external power supply. The control mode is fast, the response time is fast, the operation is stable and reliable, the equipment structure is simple, and the maintenance is convenient, greatly improving the utilization rate of sintering flue gas waste heat recovery, and thus greatly increasing the power generation load of the generating set.

[0007] Further, an analog controller is provided at the upper end of the inner wall on the left side of the control box, and a digital input / output controller is provided in the middle of the inner wall on the left side of the control box. The output ends of the first temperature sensor and the second temperature sensor are electrically connected to the input end of the analog controller. The output end of the analog controller is electrically connected to the input end of the digital input / output controller. The input end of the analog controller is electrically connected to the output end of the PLC controller. The digital input / output controller is bidirectionally electrically connected to the PLC controller. By comparing the temperature of the sintering machine flue gas outlet and the temperature of the waste heat boiler steam, the operating speed of the boiler induced draft fan motor is controlled accordingly.

[0008] Further, an intake pipe is provided at the front end of the sintering bin, and an outlet pipe is provided at the rear end of the waste heat boiler. A second induced draft fan is provided at the front end of the outlet pipe, and a first induced draft fan is provided at the front end of the connecting pipe. The input ends of the first induced draft fan and the second induced draft fan are both electrically connected to the output end of the PLC controller, providing driving force for the flow of the flue gas.

[0009] Further, a first relay is provided at the lower end of the inner wall on the left side of the control box, and a second relay is provided at the lower end of the inner wall on the left side of the control box. A frequency converter for the induced draft fan is provided at the rear end of the inner wall on the left side of the control box. The frequency converter for the induced draft fan is connected in series between the first induced draft fan and the PLC controller. The output end of the frequency converter for the induced draft fan is electrically connected to the input end of the first induced draft fan. Both the first relay and the second relay are connected in parallel between the first induced draft fan and the frequency converter for the induced draft fan.

[0010] Further, heat conducting fins are evenly distributed inside the waste heat boiler. Water pipes are provided at the lower ends of the fixed pipes. Inlet pipes are provided at the front ends of the water pipes, and the inlet pipes all extend to the outside of the waste heat boiler. Horizontally adjacent heat conducting fins are cooperatively installed with the lower ends of the same water pipe. Horizontally adjacent heat conducting fins are provided with cooling pipes distributed in a snake shape to achieve heat transfer and thus realize waste heat recovery.

[0011] Further, a feed inlet is provided at the upper end of the sintering bin. A second bin door is hinged to the upper end of the feed inlet. A waste outlet is provided at the lower end of the sintering bin. A first bin door is hinged to the upper end of the waste outlet, facilitating the maintenance of the sintering bin.

[0012] Further, uniformly distributed first support legs are fixedly connected to the lower end of the sintering bin, and symmetrically distributed second support legs are fixedly connected to the lower end of the waste heat boiler, effectively ensuring the stable progress of the sintering waste heat recovery and utilization work.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows: The system for improving the recovery rate of sintering waste heat has the following advantages:

[0014] Personnel realize the operation of Temperature Sensor 1 and Temperature Sensor 2 through the PLC controller. Temperature Sensor 1 monitors the steam temperature in real time, and Temperature Sensor 2 monitors the flue gas temperature in real time. Temperature Sensor 1 and Temperature Sensor 2 send the monitored temperature information to the signal receiving end of the analog quantity controller in real time. The analog quantity controller converts the temperature information and then transmits it to the signal receiving end of the digital quantity controller. The digital quantity controller sends the temperature information at two positions at the receiving end to the signal receiving end of the PLC controller in real time. The PLC controller compares and judges the signals at the two positions. According to the temperature comparison result at the two positions, it controls the actions of Relay 1 and Relay 2 to output, so that the auxiliary contacts of Relay 1 and Relay 2 act, to control the increase or decrease of the frequency of the boiler induced draft fan inverter; each time the frequency is increased or decreased by 0.5HZ, gradually and smoothly control the increase or decrease adjustment of the frequency of Induced Draft Fan 1, to achieve the stable control of the flue gas outlet temperature of the sintering bin within the ideal range, ensure the stable operation of the sintering unit, and at the same time, try to increase the steam temperature of the waste heat boiler to the maximum extent, ensure the improvement of the utilization rate of the waste heat flue gas of the sintering unit, so as to increase the power generation load of the generator set. The control method is fast, the response time is fast, the work is stable and reliable, the equipment structure is simple, and the maintenance is convenient. It greatly improves the utilization rate of the sintering flue gas waste heat recovery, and thus greatly increases the power generation load of the generator set. Brief Description of the Drawings

[0015] Figure 1 It is a schematic structural diagram of the present utility model;

[0016] Figure 2 It is a schematic cross-sectional structural diagram inside the present utility model;

[0017] Figure 3 It is an enlarged structural diagram of part A of the present utility model.

[0018] In the figure: 1 sintering bin, 2 connecting pipe, 3 waste heat boiler, 4 cooling pipe, 5 heat conducting fin, 6 fixed pipe, 7 water pipe, 8 steam pipe, 9 steam outlet pipe, 10 Temperature Sensor 1, 11 Temperature Sensor 2, 12 Induced Draft Fan 1, 13 Induced Draft Fan 2, 14 feed inlet, 15 waste outlet, 16 bin door 1, 17 bin door 2, 18 intake pipe, 19 outlet pipe, 20 control box, 21 PLC controller, 22 analog quantity controller, 23 Relay 1, 24 Relay 2, 25 water inlet pipe, 26 digital quantity controller, 27 induced draft fan inverter. Detailed Embodiment

[0019] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0020] Please refer to Figures 1 - 3 , this embodiment provides a technical solution: a system for improving the utilization rate of sintering waste heat, including a sintering bin 1;

[0021] Sintering bin 1: Its rear end is communicated with the front end of the waste heat boiler 3 through a connecting pipe 2. The upper end of the waste heat boiler 3 is fixedly connected with uniformly distributed fixed pipes 6. The upper ends of the fixed pipes 6 are all communicated with the lower end of the same steam pipe 8. The upper end of the steam pipe 8 is provided with an outlet pipe 9. The front end of the outlet pipe 9 is provided with a temperature sensor 10. The upper end of the connecting pipe 2 is provided with a temperature sensor 11. The lower end of the left inner wall of the control box 20 is provided with a relay 1 23. The lower end of the left inner wall of the control box 20 is provided with a relay 2 24. The rear end of the left inner wall of the control box 20 is provided with an induced draft fan frequency converter 27. The induced draft fan frequency converter 27 is connected in series between the induced draft fan 1 12 and the PLC controller 21. The output end of the induced draft fan frequency converter 27 and the input end of the induced draft fan 1 12 are electrically connected. The relay 1 23 and the relay 2 24 are both connected in parallel between the induced draft fan 1 12 and the induced draft fan frequency converter 27. The upper end of the sintering bin 1 is provided with a feed inlet 14. The upper end of the feed inlet 14 is hinged with a bin door 2 17. The lower end of the sintering bin 1 is provided with a waste outlet 15. The upper end of the waste outlet 15 is hinged with a bin door 1 16. The lower end of the sintering bin 1 is fixedly connected with uniformly distributed support legs 1. The lower end of the waste heat boiler 3 is fixedly connected with symmetrically distributed support legs 2. The operation of the induced draft fan 1 12 and the induced draft fan 2 13 is realized through the PLC controller 21 to provide driving force for the flow of flue gas. The flue gas inside the sintering bin 1 enters the inside of the waste heat boiler 3 through the connecting pipe 2 under the traction of the induced draft fan 1 12. The flue gas contacts the uniformly distributed heat conducting fins 5 and the cooling pipes 4, and transfers the waste heat of the flue gas to the water pipe 7, realizing the heating of the water body inside the water pipe 7, so that the water body inside the water pipe 7 evaporates into water vapor. The water vapor is integrated through the steam pipe 8 and then enters the next working area through the outlet pipe 9;

[0022] Among them: It also includes a control box 20. The control box 20 is located on the right side of the waste heat boiler 3. The inside of the control box 20 is provided with a PLC controller 21. The temperature sensor 10 and the temperature sensor 11 are both bidirectionally electrically connected to the PLC controller 21. The input end of the PLC controller 21 is electrically connected to an external power supply;

[0023] Among them: at the upper end of the left inner wall of the control box 20, there is an analog controller 22; in the middle of the left inner wall of the control box 20, there is a digital input controller 26. The output ends of the first temperature sensor 10 and the second temperature sensor 11 are electrically connected to the input end of the analog controller 22. The output end of the analog controller 22 is electrically connected to the input end of the digital input controller 26. The input end of the analog controller 22 is electrically connected to the output end of the PLC controller 21. The digital input controller 26 is bidirectionally electrically connected to the PLC controller 21. The PLC controller 21 enables the operation of the first temperature sensor 10 and the second temperature sensor 11. The first temperature sensor 10 monitors the steam temperature in real time, and the second temperature sensor 11 monitors the flue gas temperature in real time. The first temperature sensor 10 and the second temperature sensor 11 send the monitored temperature information to the signal receiving end of the analog controller 22 in real time. The analog controller 22 converts the temperature information and then transmits it to the signal receiving end of the digital input controller 26. The digital input controller 26 sends the temperature information at the two positions at the receiving end to the signal receiving end of the PLC controller 21 in real time. The PLC controller 21 compares and judges the signals at the two positions. According to the temperature comparison result at the two positions, it controls the operation of the first relay 23 and the second relay 24 to output, so that the auxiliary contacts of the first relay 23 and the second relay 24 act, to control the increase or decrease of the frequency of the boiler induced draft fan frequency converter 27; each time the frequency is increased or decreased by 0.5HZ, gradually and smoothly control the increase or decrease adjustment of the frequency of the first induced draft fan 12, to achieve the purpose of controlling the flue gas outlet temperature of the sintering bin 1 to be stable within the ideal range, ensuring the stable operation of the sintering unit, and at the same time, maximizing the steam temperature of the waste heat boiler 3 as much as possible, ensuring the improvement of the utilization rate of the waste heat flue gas of the sintering unit, thereby increasing the power generation load of the power generation unit;

[0024] Among them: at the front end of the sintering bin 1, there is an inlet pipe 18; at the rear end of the waste heat boiler 3, there is an outlet pipe 19. At the front end of the outlet pipe 19, there is a second induced draft fan 13. At the front end of the connecting pipe 2, there is a first induced draft fan 12. The input ends of the first induced draft fan 12 and the second induced draft fan 13 are electrically connected to the output end of the PLC controller 21. At the lower end of the left inner wall of the control box 20, there is a first relay 23. At the lower end of the left inner wall of the control box 20, there is a second relay 24. At the rear end of the left inner wall of the control box 20, there is an induced draft fan frequency converter 27. The induced draft fan frequency converter 27 is connected in series between the first induced draft fan 12 and the PLC controller 21. The output end of the induced draft fan frequency converter 27 is electrically connected to the input end. The first relay 23 and the second relay 24 are both connected in parallel between the first induced draft fan 12 and the induced draft fan frequency converter 27.

[0025] The working principle of a system for improving the recovery and utilization rate of sintering waste heat provided by the present utility model is as follows: During operation, personnel respectively place the sintering bin 1, the waste heat boiler 3, and the gas mechanism stably on the horizontal working area through the first support leg and the second support leg. After stable placement, the personnel operate the first induced draft fan 12 and the second induced draft fan 13 through the PLC controller 21 to provide driving force for the flow of flue gas. The flue gas inside the sintering bin 1 enters the inside of the waste heat boiler 3 through the connecting pipe 2 under the traction of the first induced draft fan 12. The flue gas contacts the uniformly distributed heat conducting fins 5 and the cooling pipes 4, transferring the waste heat of the flue gas to the water pipe 7 to heat the water body inside the water pipe 7, causing the water body inside the water pipe 7 to evaporate into water vapor. The water vapor is integrated through the steam pipe 8 and then enters the next working area through the steam outlet pipe 9. At the same time, the PLC controller 21 operates the first temperature sensor 10 and the second temperature sensor 11. The first temperature sensor 10 monitors the steam temperature in real time, and the second temperature sensor 11 monitors the flue gas temperature in real time. The first temperature sensor 10 and the second temperature sensor 11 send the monitored temperature information to the signal receiving end of the analog quantity controller 22 in real time. The analog quantity controller 22 converts the temperature information and then transmits it to the signal receiving end of the digital quantity controller 26. The digital quantity controller 26 sends the temperature information at the two positions of the receiving end to the signal receiving end of the PLC controller 21 in real time. The PLC controller 21 compares and judges the signals at the two positions. According to the temperature comparison result at the two positions, it controls the actions of the first relay 23 and the second relay 24 to output, and controls the increase or decrease of the frequency of the boiler induced draft fan frequency converter 27 through the action conditions of the auxiliary contacts of the first relay 23 and the second relay 24; each time the frequency is increased or decreased by 0.5 HZ, gradually and smoothly control the increase or decrease adjustment of the frequency of the first induced draft fan 12 to control the flue gas outlet temperature of the sintering bin 1 to be stable within the ideal range, ensure the stable operation of the sintering unit, and at the same time, maximize the steam temperature of the waste heat boiler 3 as much as possible to ensure the improvement of the utilization rate of the waste heat flue gas of the sintering unit, thereby achieving the purpose of increasing the power generation load of the power generation unit.

[0026] It should be noted that in the above embodiments, the first induced draft fan 12 and the second induced draft fan 13 disclosed can both be Y5-47 boiler induced draft fans, the first temperature sensor 10 and the second temperature sensor 11 can both be XH-PT1-222110-150 thermal resistance temperature sensors, the PLC controller 21 can be a 6ES7414-3EM05-0AB0 controller, the analog quantity controller 22 can be a 6ES7331-7KF02-0AB0 control board, the digital quantity controller 26 can be a 6ES7 322-1BL00-0AA0 control board, and the PLC controller 21 controls the first temperature sensor 10, the second temperature sensor 11, the first induced draft fan 12, the second induced draft fan 13, the analog quantity controller 22, the first relay 23, the second relay 24, the digital quantity controller 26, and the induced draft fan frequency converter 27 to work using common methods in the prior art.

[0027] The above are only embodiments of the present utility model, and thus do not limit the patent scope of the present utility model. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present utility model, or directly or indirectly applied in other related technical fields, shall similarly be included within the patent protection scope of the present utility model.

Claims

1. A system for improving the recovery rate of sintering waste heat, characterized in that: It comprises a sintering bin (1); Sintering bin (1): Its rear end is connected to the front end of the waste heat boiler (3) through a connecting pipe (2); the upper end of the waste heat boiler (3) is fixedly connected to uniformly distributed fixed pipes (6); the upper ends of the fixed pipes (6) are all connected to the lower end of the same steam pipe (8); the upper end of the steam pipe (8) is provided with a steam outlet pipe (9); the front end of the steam outlet pipe (9) is provided with a temperature sensor 1 (10); the upper end of the connecting pipe (2) is provided with a temperature sensor 2 (11); The invention further comprises a control box (20), the control box (20) being located on the right side of the waste heat boiler (3), a PLC controller (21) being arranged inside the control box (20), the temperature sensor 1 (10) and the temperature sensor 2 (11) being both bidirectionally electrically connected to the PLC controller (21), and the input end of the PLC controller (21) being electrically connected to an external power supply.

2. A system for improving the recovery rate of sintering waste heat according to claim 1, characterized in that: An analog quantity controller (22) is arranged at the upper end of the left inner wall of the control box (20), a switch quantity controller (26) is arranged at the middle of the left inner wall of the control box (20), the output ends of the temperature sensor 1 (10) and the temperature sensor 2 (11) are both electrically connected to the input end of the analog quantity controller (22), the output end of the analog quantity controller (22) is electrically connected to the input end of the switch quantity controller (26), the input end of the analog quantity controller (22) is electrically connected to the output end of the PLC controller (21), and the switch quantity controller (26) is bidirectionally electrically connected to the PLC controller (21).

3. The system for improving the recovery rate of sintering waste heat according to claim 1, characterized in that: The front end of the sintering bin (1) is provided with an air inlet pipe (18), the rear end of the waste heat boiler (3) is provided with an air outlet pipe (19), the front end of the air outlet pipe (19) is provided with an induced draft fan 2 (13), the front end of the connecting pipe (2) is provided with an induced draft fan 1 (12), and the input ends of the induced draft fan 1 (12) and the input ends of the induced draft fan 2 (13) are both electrically connected to the output end of the PLC controller (21).

4. A system for improving the recovery rate of sintering waste heat according to claim 3, characterized in that: A relay 1 (23) is arranged at the lower end of the left inner wall of the control box (20), a relay 2 (24) is arranged at the lower end of the left inner wall of the control box (20), and an induced draft fan frequency converter (27) is arranged at the rear end of the left inner wall of the control box (20). The induced draft fan frequency converter (27) is connected in series between the induced draft fan 1 (12) and the PLC controller (21), an output end of the induced draft fan frequency converter (27) is electrically connected to an input end of the induced draft fan 1 (12), and the relay 1 (23) and the relay 2 (24) are both connected in parallel between the induced draft fan 1 (12) and the induced draft fan frequency converter (27).

5. The system for improving the recovery rate of sintering waste heat according to claim 1, characterized in that: The waste heat boiler (3) is provided with uniformly distributed heat conducting plates (5), the lower end of each fixed pipe (6) is provided with a water pipe (7), the front end of each water pipe (7) is provided with a water inlet pipe (25), and the water inlet pipe (25) extends to the outside of the waste heat boiler (3), the heat conducting plates (5) adjacent to each other in the transverse direction are installed in cooperation with the lower end of the same water pipe (7), and the heat conducting plates (5) adjacent to each other in the transverse direction are provided with serpentine-distributed cooling pipes (4).

6. The system for improving the recovery rate of sintering waste heat according to claim 1, characterized in that: The upper end of the sintering bin (1) is provided with a feed port (14), the upper end of which is hingedly connected to a bin door 2 (17); the lower end of the sintering bin (1) is provided with a waste port (15), the upper end of which is hingedly connected to a bin door 1 (16).

7. The system for improving the recovery rate of sintering waste heat according to claim 1, characterized in that: The lower end of the sintering bin (1) is fixedly connected to a first support leg that is evenly distributed, and the lower end of the waste heat boiler (3) is fixedly connected to a second support leg that is symmetrically distributed.

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