CN215294957U - Slag water cooling circulation monitoring system of closed slag dragging machine - Google Patents
Slag water cooling circulation monitoring system of closed slag dragging machine Download PDFInfo
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- CN215294957U CN215294957U CN202121667924.9U CN202121667924U CN215294957U CN 215294957 U CN215294957 U CN 215294957U CN 202121667924 U CN202121667924 U CN 202121667924U CN 215294957 U CN215294957 U CN 215294957U
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Abstract
The utility model discloses a closed dragveyer sediment water cooling cycle monitored control system belongs to boiler lime-ash and handles technical field. The system comprises a slag dragging machine, a slag bin, a radar liquid level meter, a temperature sensor, an overflow water pump, a high-efficiency thickener, a cooler, a water supply pool, a water supply pump, an electric control valve, a high-efficiency heat exchanger, a first electric valve, a second electric valve, a pressure sensor and a PLC electric control cabinet. The slag water cooling circulation monitoring system of the closed slag conveyor provided by the utility model adjusts the water temperature inside the shell of the slag conveyor by controlling the overflow water backflow water supplement of the slag conveyor, thereby avoiding the overhigh water temperature inside the shell of the slag conveyor; when the water temperature in the shell of the slag conveyor is normal, the waste of water resources caused by excessive water supply of the slag conveyor is avoided; even if the high-efficiency heat exchanger is damaged under severe working conditions, the whole closed circulation system can still normally work through monitoring and executing control.
Description
Technical Field
The utility model relates to a boiler lime-ash processing technology field, in particular to closed dragveyer sediment water cooling cycle monitored control system.
Background
The slag dragging machine used in the coal-fired power plant is the main equipment for mechanically deslagging the coal-fired power generation boiler, is positioned at the bottom of the boiler, and ash slag after pulverized coal combustion is discharged from the bottom of the boiler, collected and cooled by the slag dragging machine, and discharged from the top of the slag dragging machine. The working principle of the slag conveyor is as follows: high-temperature ash falling from a boiler slag well falls into a slag conveyor body, the high-temperature ash is cooled by circulating cooling water in the body, and meanwhile, a boiler hearth is kept isolated from the outside, so that the effect of sealing a boiler is achieved; the cooled ash and slag are driven by a hydraulic motor at the top of the slag conveyor to drive the circular chain and the scraper on the circular chain to move, and the cooled ash and slag are continuously conveyed to next-stage equipment outside the hearth so as to be reprocessed; when the next-stage equipment is in failure, the slag hopper can be temporarily used for storing slag.
In order to ensure the normal operation of the slag conveyor equipment and the smooth cooling of high-temperature ash and slag, the temperature of slag water in the groove body of the slag conveyor is required to be not too high (the equipment is specified: the temperature of the slag water is not higher than 65 ℃), and cooling water with lower temperature is required to be continuously supplemented into the groove body of the slag conveyor. As the ash and slag continuously fall from the boiler, the groove body of the slag dragging machine can continuously overflow water with higher temperature. In order to treat overflow water with high temperature, an overflow slag water treatment system is required to be arranged outside the slag conveyor and is responsible for clarification, cooling and conveying backflow of the overflow water so as to avoid water resource waste and environmental pollution. When the boiler is in full-load operation, the purpose of cooling is achieved by increasing the cooling water quantity, the water quantity is large, and the overflow water can be increased. In order to reduce overflow water, a high-efficiency heat exchanger is arranged in sealing water in the shell of the slag conveyor, heat of the sealing water of the groove body of the slag conveyor is exchanged by closed circulating cooling water, and the temperature of the sealing water of the slag conveyor is not higher than the industrial and national standards.
Referring to fig. 1, when the coal-fired power plant boiler normally operates, high-temperature ash falls into the interior of a shell of the slag conveyor from a hearth, the slag conveyor normally operates, a driving wheel system drives a scraper on a circular chain to convey the ash falling into the bottom of the slag conveyor to a slag bin, and after wet ash in the slag bin reaches a certain material level, the wet ash is conveyed to the next place by a truck for treatment. At present, the quality of fire coal used by many domestic coal-fired power plants is reduced, the energy is less, and the ash content is large. When the boiler full load operation, the coal volume of burning increases, and the boiler slag well falls into the inside high temperature lime-ash volume increase of dragveyer casing, dragveyer overflow water volume increase, and the inside temperature of dragveyer casing rises, and the dragveyer reduces the cooling efficiency of high temperature lime-ash, and a large amount of liquid water evaporation to vapor form the water explosion, influences dragveyer system safety to aggravate the waste of water resource. Overflow water of the slag dragging machine and the slag bin converges to an overflow water pool, the overflow water is conveyed to a high-efficiency concentrator by an overflow water pump for filtering, filtered clean water enters a cooler for cooling, and the cooled clean water flows into a water supply pool for converging and flows into the slag dragging machine again for use. And (5) filtering to finish the confluence and collection treatment of the residual slag and liquid. The overflow water treatment method can reduce the waste of partial overflow water, and can reduce the water temperature in the shell of the slag conveyor through the cooling reflux of the overflow water. At present, many power plants are also provided with a high-efficiency heat exchanger inside a shell of the slag conveyor for cooling water inside the shell of the slag conveyor, and the cooling mode is circulating closed cooling: the cooling water is sent to the high-efficiency heat exchanger through the pipeline circulating pump, the cooling water brings out the heat inside the shell of the slag conveyor to the water return pipe through the heat exchanger, and the water in the water return pipe is cooled and is recycled again, as shown in fig. 2.
However, the existing slag conveyor has the following disadvantages: because the moisturizing volume of dragveyer is the definite value, consequently the moisturizing volume can not carry out dynamic adjustment along with the inside water level of dragveyer casing and the temperature change, easily appear leading to dragveyer casing inside temperature too high because of the moisturizing volume is not enough and lead to the boiler stove bottom water seal not in place because of the water level is low excessively to and lead to the overflow water to increase because of the moisturizing volume is too much and the water level is too high, cause the waste of water resource one-tenth and electric energy. In addition, the structure of the high-efficiency heat exchanger in the shell of the slag conveyor is relatively single and thin, the high-efficiency heat exchanger is easy to wear and leak under severe working conditions, and cooling water of the heat exchanger enters the shell of the slag conveyor through the leaking part, so that the waste of cooling water resources is caused; meanwhile, ash and slag can flow into the leakage part, and the normal work of the circulating closed cooling system is influenced.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem that the water level and the water temperature in the shell of the existing slag conveyor are poor in energy regulation, the utility model provides a slag water cooling circulation monitoring system of a closed slag conveyor, which comprises a slag conveyor, a slag bin, a radar liquid level meter, a temperature sensor, an overflow water pump, a high-efficiency concentrator, a cooler, a water supply tank, a water supply pump, an electric control valve, a high-efficiency heat exchanger, a first electric valve, a second electric valve, a pressure sensor and a PLC electric control cabinet; the slag conveyor is sealed at the bottom of a slag discharge port of the boiler, and the top of the slag conveyor is communicated with the slag bin; the radar liquid level meter is arranged at the boiler slag discharging port and is positioned right above the water cover of the slag conveyor; the temperature sensor is arranged on one side of the shell of the slag conveyor; an inlet of the overflow water pump is respectively connected with overflow ports of the slag conveyor and the slag bin through overflow water pipes, an outlet of the overflow water pump is connected with an inlet of the high-efficiency concentrator, an outlet of the high-efficiency concentrator is communicated with the top of the cooler, the bottom of the cooler is communicated with the water supply tank, an inlet of the water supply pump is connected with the water supply tank, an outlet of the water supply pump is connected with an inlet of the electric control valve through a pipeline, and an outlet of the electric control valve is communicated with the interior of the shell of the slag conveyor through a pipeline; the efficient heat exchanger is arranged in the shell of the slag conveyor, the inlet of the efficient heat exchanger is connected with a water inlet pipe through the first electric valve, the outlet of the efficient heat exchanger is connected with a water return pipe through the second electric valve, and the water inlet pipe and the outlet of the efficient heat exchanger are both connected with the pressure sensor; the temperature sensor, the radar liquid level meter, the pressure sensor, the electric control valve, the first electric valve and the second electric valve are respectively and electrically connected with the PLC electric control cabinet.
The water inlet pipe is provided with a first gate valve and a filter, and the outlet of the filter is connected with the pressure sensor; and a second gate valve is arranged on the water return pipe.
Preferably, the overflow water pump comprises two parallel overflow water pumps, inlets of the two parallel overflow water pumps are respectively connected with the casing of the slag salvaging machine and the overflow port of the slag bin through the overflow water pipe, and outlets of the two parallel overflow water pumps are respectively connected with the inlet of the high-efficiency concentrator.
Preferably, the cooler comprises two coolers connected in parallel, the tops of the two coolers are communicated with the outlet of the high-efficiency concentrator, and the bottoms of the two coolers are respectively communicated with the water supply tank.
Preferably, the electrically controlled valve, the first electrically operated valve and the second electrically operated valve are all solenoid valves.
The slag water cooling circulation monitoring system of the closed slag conveyor provided by the utility model adjusts the water temperature inside the shell of the slag conveyor by controlling the overflow water backflow water supplement of the slag conveyor, thereby avoiding the overhigh water temperature inside the shell of the slag conveyor; when the water temperature in the shell of the slag conveyor is normal, the waste of water resources caused by excessive water supply of the slag conveyor is avoided. The utility model provides a closed dragveyer sediment water cooling circulation monitored control system even high-efficient heat exchanger damages under abominable operating mode, also can be through monitoring and execution control for whole closed circulation system still can normally work.
Drawings
FIG. 1 is a schematic view of a slag water treatment process of a conventional slag conveyor;
FIG. 2 is a schematic diagram of the heat exchange principle of a high-efficiency heat exchanger in the shell of the existing slag conveyor;
FIG. 3 is a schematic view of a slag water cooling circulation monitoring system of the closed type slag conveyor of the embodiment;
fig. 4 is a schematic diagram of the heat exchange control principle of the high-efficiency heat exchanger in the embodiment.
Detailed Description
The technical solution of the present invention will be further described with reference to the accompanying drawings and examples.
Referring to fig. 3 and 4, the embodiment of the utility model provides a closed dragveyer sediment water cooling cycle monitored control system, including dragveyer 1, sediment storehouse 2, radar level gauge 3, temperature sensor 4, overflow water pump 5, high-efficient concentrated machine 6, cooler 7, water supply tank 8, water supply pump 9, electric control valve 10, high-efficient heat exchanger 11, electric valve 12, electric valve 13, pressure sensor 14 and the automatically controlled cabinet 15 of PLC. Wherein, the slag conveyor 1 is sealed at the bottom of a slag discharge port of the boiler by water, and the top of the slag conveyor 1 is communicated with the slag bin 2; the radar liquid level meter 3 is arranged at a boiler slag discharge port and is positioned right above a water cover of the slag conveyor; the temperature sensor 4 is arranged on one side of the shell of the slag conveyor and is used for monitoring the temperature of slag water in the shell of the slag conveyor; an inlet of an overflow water pump 5 is respectively connected with overflow ports of the slag conveyor 1 and the slag bin 2 through overflow water pipes, an outlet of the overflow water pump 5 is connected with an inlet of a high-efficiency concentrator 6, an outlet of the high-efficiency concentrator 6 is communicated with the top of a cooler 7, the bottom of the cooler 7 is communicated with a water supply tank 8, an inlet of a water supply pump 9 is connected with the water supply tank 8, an outlet of the water supply pump 9 is connected with an inlet of an electric control valve 10 through a pipeline, and an outlet of the electric control valve 10 is communicated with the interior of a shell of the slag conveyor through a pipeline; the efficient heat exchanger 11 is arranged in the shell of the slag conveyor, the inlet of the efficient heat exchanger 11 is connected with a water inlet pipe through an electric valve 12, the outlet of the efficient heat exchanger 11 is connected with a water return pipe through an electric valve 13, a gate valve and a filter are arranged on the water inlet pipe, and the outlet of the filter and the outlet of the efficient heat exchanger 11 are both connected with a pressure sensor 14; the temperature sensor 4, the radar liquid level meter 3, the pressure sensor 14, the electric control valve 10, the electric valve 12 and the electric valve 13 are respectively and electrically connected with a PLC (programmable logic controller) electric control cabinet 15.
Referring to fig. 3, in a specific application, in order to monitor the slag water temperature inside the casing of the slag conveyor more objectively and accurately, the number of the temperature sensors is usually a plurality, for example, 3, and the temperature sensors are respectively installed at different positions on one side of the casing of the slag conveyor, and the measured average value of the slag water temperature is used as the slag water temperature inside the casing of the slag conveyor; the electric control valve 10 can be an electromagnetic valve and is used for controlling the on-off of the backflow water replenishing; the electric valve 12 and the electric valve 13 can be electromagnetic valves for opening or closing the inlet and the outlet of the high-efficiency heat exchanger. The overflow water pump 5 comprises two overflow water pumps which are connected in parallel, the inlets of the two overflow water pumps which are connected in parallel are respectively connected with the overflow ports of the slag dragging machine shell and the slag bin through overflow water pipes, and the outlets of the two overflow water pumps which are connected in parallel are respectively connected with the inlet of the high-efficiency concentrator 6. The cooler 7 comprises two coolers connected in parallel, the tops of the two coolers in parallel are communicated with the outlet of the high-efficiency thickener 6, and the bottoms of the two coolers in parallel are respectively communicated with the water supply tank 8. Compare in current as the treatment of dragveyer slag water that fig. 1 shows, the embodiment of the utility model provides an increased an overflow water pump and a cooler, can in time improve the circulation volume of overflow water like this effectively, the cooling of overflow water with higher speed.
Referring to fig. 3 and 4, the embodiment of the utility model provides a closed dragveyer sediment water cooling cycle monitored control system can in time realize the dynamic adjustment of the inside water level of dragveyer casing and temperature effectively, mainly shows:
1) when the radar liquid level meter 3 monitors that the water level inside the shell of the slag conveyor falls to the sealing water level of the critical boiler, the radar liquid level meter 3 sends a signal to the PLC electric control cabinet 15, the PLC electric control cabinet 15 sends an opening signal to the electric control valve actuator, and the electric control valve 10 is opened to circularly replenish water inside the shell of the slag conveyor.
2) When monitoring that the water level in the shell of the slag conveyor rises to the critical overflow water level, the radar liquid level meter 3 sends a signal to the PLC electric control cabinet 15, the PLC electric control cabinet 15 sends a closing signal to the electric control valve actuator, the electric control valve 10 is closed, and water supplement to the inside of the shell of the slag conveyor is stopped.
3) When temperature sensor 4 monitored the inside temperature in water temperature of dragveyer casing and risen to alert temperature, temperature sensor 4 sent signal to automatically controlled cabinet 15 of PLC, automatically controlled cabinet 15 of PLC sent opening signal to automatically controlled valve executor, and automatically controlled valve 10 is opened, carries out circulation moisturizing, cooling to dragveyer casing inside.
4) When the temperature sensor 4 monitors that the temperature of the water inside the shell of the slag conveyor recovers to the normal temperature, the temperature sensor 4 sends a signal to the PLC electric control cabinet 15, the PLC electric control cabinet 15 sends a closing signal to the electric control valve actuator, the electric control valve 10 is closed, and water replenishing inside the shell of the slag conveyor is stopped.
5) When the radar liquid level meter 3 detects that the water level in the shell of the slag conveyor falls to the sealing water level of the critical boiler,
even if the temperature sensor 4 monitors that the temperature of the water inside the shell of the slag conveyor is normal, the PLC electric control cabinet 15 preferentially executes
The signal of radar level gauge 3, PLC automatically controlled cabinet 15 send opening signal to electric control valve executor, and electric control valve 10 is opened, carries out circulation moisturizing to dragveyer casing inside.
6) When temperature sensor 4 monitored the inside temperature degree of water of dragveyer casing and risen to warning temperature, even when radar level gauge 3 monitored the inside water level of dragveyer casing and risen to critical overflow water level, the automatically controlled cabinet of PLC 15 priority carries out temperature sensor 4's signal, and automatically controlled cabinet 15 of PLC sends opening signal to electric control valve executor, and electric control valve 10 is opened, carries out circulation moisturizing, cooling to dragveyer casing inside.
7) When the amount of high-temperature ash falling into the interior of the shell of the slag conveyor is increased suddenly, the temperature sensor 4 monitors that the water temperature in the interior of the shell of the slag conveyor rises rapidly, so that the overflow water amount of the slag conveyor is increased rapidly, the radar liquid level meter 3 monitors that the water level in the interior of the shell of the slag conveyor rises to the overflow water level, at the moment, the PLC electric control cabinet 15 controls to open another overflow water pump and another cooler which are connected in parallel, so that the two overflow water pumps and the two coolers work together, the electric control valve 10 is opened, circulating water supplement is carried out on the interior of the shell of the slag conveyor, and the overflow water cooling and cooling are accelerated.
8) When the outlet pressure of the high-efficiency heat exchanger monitored by the pressure sensor 14 is smaller than the pressure of the cooling water inlet pipe of the heat exchange system, the high-efficiency heat exchanger is indicated to be leaked or damaged, the PLC electric control cabinet gives an alarm and sends closing signals to the actuators of the electric valve 12 and the electric valve 13, and the electric valve 12 and the electric valve 13 at the inlet and the outlet of the high-efficiency heat exchanger with abnormal pressure are closed. The maintainer can dismantle the high-efficient heat exchanger of pressure anomaly under the safe condition, maintains.
The embodiment of the utility model provides a closed dragveyer sediment water cooling cycle monitored control system, through increasing the radar level gauge to the existing equipment operating mode, a weighing sensor and a temperature sensor, the automatically controlled cabinet of PLC, automatically controlled valve, overflow water pump and cooler, the real-time supervision to the inside water level of dragveyer casing and temperature has been realized, the handling capacity and the backward flow of automatically regulated overflow water, make the throughput of overflow water strengthen greatly, greatly improved the ability that reduces the inside temperature of dragveyer casing through the control to backward flow overflow water, the safety seal of boiler has been guaranteed, also can keep the inside temperature of dragveyer casing invariable under abominable operating mode condition, the utilization ratio of overflow water has been improved, the water resource has been practiced thrift. The embodiment of the utility model provides a closed dragveyer sediment water cooling circulation monitored control system through sealing circulation system increase pressure sensor and electric valve to high-efficient heat exchanger, has guaranteed the normal work of sealing circulation system, even high-efficient heat exchanger damages under abominable operating mode, also can be through monitoring and execution control for whole sealing circulation system still can normally work.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (5)
1. A slag water cooling circulation monitoring system of a closed slag conveyor is characterized by comprising a slag conveyor, a slag bin, a radar liquid level meter, a temperature sensor, an overflow water pump, a high-efficiency concentrator, a cooler, a water supply tank, a water supply pump, an electric control valve, a high-efficiency heat exchanger, a first electric valve, a second electric valve, a pressure sensor and a PLC (programmable logic controller) electric control cabinet; the slag conveyor is sealed at the bottom of a slag discharge port of the boiler, and the top of the slag conveyor is communicated with the slag bin; the radar liquid level meter is arranged at the boiler slag discharging port and is positioned right above the water cover of the slag conveyor; the temperature sensor is arranged on one side of the shell of the slag conveyor; an inlet of the overflow water pump is respectively connected with overflow ports of the slag conveyor and the slag bin through overflow water pipes, an outlet of the overflow water pump is connected with an inlet of the high-efficiency concentrator, an outlet of the high-efficiency concentrator is communicated with the top of the cooler, the bottom of the cooler is communicated with the water supply tank, an inlet of the water supply pump is connected with the water supply tank, an outlet of the water supply pump is connected with an inlet of the electric control valve through a pipeline, and an outlet of the electric control valve is communicated with the interior of the shell of the slag conveyor through a pipeline; the efficient heat exchanger is arranged in the shell of the slag conveyor, the inlet of the efficient heat exchanger is connected with a water inlet pipe through the first electric valve, the outlet of the efficient heat exchanger is connected with a water return pipe through the second electric valve, and the water inlet pipe and the outlet of the efficient heat exchanger are both connected with the pressure sensor; the temperature sensor, the radar liquid level meter, the pressure sensor, the electric control valve, the first electric valve and the second electric valve are respectively and electrically connected with the PLC electric control cabinet.
2. The slag water cooling circulation monitoring system of the closed slag conveyor according to claim 1, wherein a first gate valve and a filter are arranged on the water inlet pipe, and the outlet of the filter is connected with the pressure sensor; and a second gate valve is arranged on the water return pipe.
3. The slag water cooling circulation monitoring system of the closed slag conveyor according to claim 1, wherein the overflow water pump comprises two parallel overflow water pumps, inlets of the two parallel overflow water pumps are respectively connected with the slag conveyor shell and the overflow port of the slag bin through the overflow water pipe, and outlets of the two parallel overflow water pumps are respectively connected with the inlet of the high-efficiency concentrator.
4. The closed slag salvaging machine slag water cooling circulation monitoring system of claim 1, wherein the cooler comprises two coolers in parallel, the top of the two coolers in parallel are communicated with the outlet of the high efficiency concentrator, and the bottom of the two coolers in parallel are respectively communicated with the water supply tank.
5. The closed slag conveyor cooling circulation monitoring system of claim 1, wherein the electrically controlled valve, the first electrically operated valve and the second electrically operated valve are all solenoid valves.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121667924.9U CN215294957U (en) | 2021-07-22 | 2021-07-22 | Slag water cooling circulation monitoring system of closed slag dragging machine |
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| CN202121667924.9U CN215294957U (en) | 2021-07-22 | 2021-07-22 | Slag water cooling circulation monitoring system of closed slag dragging machine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114963214A (en) * | 2022-05-26 | 2022-08-30 | 贵州易佰顺贸易有限公司 | Automatic slag discharging mechanism of high-efficiency grate incinerator |
| CN115520987A (en) * | 2022-09-13 | 2022-12-27 | 华能曲阜热电有限公司 | Accumulated slag treatment device at tail part of scraper slag conveyor |
-
2021
- 2021-07-22 CN CN202121667924.9U patent/CN215294957U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114963214A (en) * | 2022-05-26 | 2022-08-30 | 贵州易佰顺贸易有限公司 | Automatic slag discharging mechanism of high-efficiency grate incinerator |
| CN115520987A (en) * | 2022-09-13 | 2022-12-27 | 华能曲阜热电有限公司 | Accumulated slag treatment device at tail part of scraper slag conveyor |
| CN115520987B (en) * | 2022-09-13 | 2024-05-28 | 华能曲阜热电有限公司 | Tail accumulated slag treatment device of scraper slag conveyor |
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