CN209819523U - Waste heat boiler drum water level control system - Google Patents
Waste heat boiler drum water level control system Download PDFInfo
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- CN209819523U CN209819523U CN201920133424.3U CN201920133424U CN209819523U CN 209819523 U CN209819523 U CN 209819523U CN 201920133424 U CN201920133424 U CN 201920133424U CN 209819523 U CN209819523 U CN 209819523U
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Abstract
The utility model relates to a waste heat boiler drum water level control system, which belongs to the field of waste heat boiler power generation; the waste heat boiler steam drum liquid level adjusting system adopts a frequency converter control and buffer pool double adjusting mode; the technical scheme is as follows: a heat recovery boiler drum water level control system comprising: the system comprises a PLC, a frequency converter, a water pump, a water level detector, a water inlet buffer pool, an electromagnetic valve and a power supply; the water pump is arranged in a water replenishing tank for the waste heat boiler, a water outlet of the water pump is communicated with a water inlet buffer tank, the water inlet buffer tank is communicated with a steam drum of the waste heat boiler, a solenoid valve is arranged on a pipeline for communicating the water inlet buffer tank with the steam drum of the waste heat boiler, and a water level detector is arranged in the steam drum of the waste heat boiler and used for detecting the water level; PLC links to each other with converter, water level detection meter and solenoid valve electricity respectively, and three-phase alternating current is connected to converter power input, and the water pump is connected to converter power output, and the power provides electric power for PLC, water level detection meter and solenoid valve operation.
Description
Technical Field
The utility model relates to a waste heat boiler drum water level control system belongs to the waste heat boiler power generation field.
Background
The waste heat boiler is an indispensable key link in a smelting process as energy-saving and emission-reducing equipment, and mainly has the functions of cooling flue gas generated by a furnace body in the smelting process, using heat released in the flue gas cooling link to generate steam, and using the steam in other production processes.
The waste heat boiler is a complex system with multiple inputs and outputs and all control parameters coupled with each other, and the drum water level is an important controlled variable of the waste heat boiler system. If the water level is too low, the water vapor balance is influenced slightly, the waste heat boiler is burnt dry if the water level is too low, and accidents such as explosion of the waste heat boiler can be caused if the water level is serious. If the water level is too high, the phenomenon of liquid carrying of steam is easily caused, the yield and the quality of the steam are reduced, the superheater is also scaled, or the blades of a steam turbine for steam power generation are damaged. Therefore, it is very important to stabilize the drum water level within a certain range during the production process.
The existing steam drum water level is controlled by a water level gauge and a water pump. In the control process, the water pump is opened and shut down according to water level gauge display data, but in the actual operation process, the water pump starts frequently, and the steam pocket interior water level control effect is relatively poor, appears often that the water yield is less than or exceeds the critical value, has caused great injury to water pump and exhaust-heat boiler.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides an adopt converter control and buffer pool dual regulation mode's exhaust-heat boiler drum liquid level control system.
In order to achieve the technical purpose, the utility model provides a technical scheme does: a heat recovery boiler drum water level control system comprising: the system comprises a PLC, a frequency converter, a water pump, a water level detector, a water inlet buffer pool, an electromagnetic valve and a power supply; the water pump is arranged in a water replenishing tank for the waste heat boiler, a water outlet of the water pump is communicated with a water inlet buffer tank, the water inlet buffer tank is communicated with a steam drum of the waste heat boiler, a solenoid valve is arranged on a pipeline for communicating the water inlet buffer tank with the steam drum of the waste heat boiler, and the water level detector is arranged in the steam drum of the waste heat boiler and used for detecting the water level;
the PLC is respectively electrically connected with the frequency converter, the water level detector and the electromagnetic valve, the power input end of the frequency converter is connected with three-phase alternating current, the power output end of the frequency converter is connected with the water pump, and the power supply provides electric power for the operation of the PLC, the water level detector and the electromagnetic valve.
The water level gauge includes: the capacitance barrel, the upper polar plate, the lower polar plate, the suspension plate and the sensor measuring circuit; the utility model discloses a waste heat boiler steam drum, including capacitor bucket, one end opening and lower opening, capacitor bucket is fixed in the inside top of waste heat boiler steam drum, capacitor bucket is one end opening and the decurrent barreled structure of opening, capacitor bucket upper portion is fixed with the upper polar plate, be provided with the bottom plate in the capacitor bucket of upper polar plate below, and the bottom plate can slide from top to bottom relative capacitor bucket, the bottom plate below is provided with the suspension board, and is connected through insulating branch between bottom plate and the suspension board, upper polar plate and bottom plate respectively with sensor measuring circuit electrical connection, sensor measuring circuit signal voltage output and PLC electrical connection.
The circuit comprises an operational amplifier A, a fixed capacitor C and a power supply U, wherein the non-inverting input end and the inverting input end of the operational amplifier A are respectively connected with the positive electrode and the negative electrode of the power supply U, the fixed capacitor C is connected in series on the circuit of the inverting input end of the operational amplifier A, the inverting input end of the operational amplifier A is electrically connected with a lower electrode plate, and the output end of the operational amplifier A is electrically connected with an upper electrode plate and a PLC signal input end.
And the upper part of the water inlet buffer tank is provided with a water inlet communicated with the water pump, and the lower part of the water inlet buffer tank is provided with a water outlet communicated with the waste heat boiler steam drum.
The electromagnetic valve adopts a flow regulating electromagnetic valve.
The water pump is a submersible pump.
The operational amplifier A is μ A741.
Capacitor media, such as ceramic media, can be arranged in the capacitor barrels of the upper polar plate and the lower polar plate.
The signal voltage U0 input into the singlechip by the sensor measuring circuit is as follows:
u0 is the signal voltage input into the single chip by the sensor measuring circuit,
u is the voltage of a power supply U, the power supply U is a direct current power supply,
c is the capacitance of the fixed capacitor C,
d is the distance between the upper polar plate and the lower polar plate,
epsilon is the medium coefficient between the upper polar plate and the lower polar plate,
and S is the area of the opposite plate surface of the upper polar plate and the lower polar plate.
Compared with the prior art, the utility model beneficial effect who has:
one, the utility model discloses a water level detection meter adopts capacitanc level sensor to detect, and the response is sensitive, can carry out whole control to the water level variation, and PLC can predict the water level variation in a period according to the change data simultaneously to through converter control water pump power.
The water inlet buffer pool of the utility model has the function of storing a small amount of water, and through the mutual matching of the electromagnetic valve and the water pump, the starting frequency of the water pump can be reduced, and meanwhile, the scouring of the water outlet of the water pump to the steam pocket is reduced; in addition, the water inlet buffer pool is matched with the electromagnetic valve, so that the water supplement amount of the steam pocket can be further accurately controlled.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic circuit diagram of the present invention;
FIG. 3 is a schematic view of the structure of the water level gauge of the present invention;
FIG. 4 is a schematic diagram of a sensor measurement circuit of the present invention;
in the figure: the device comprises a PLC (programmable logic controller) 1, a frequency converter 2, a water pump 3, a water level detector 4, a water inlet buffer tank 5, an electromagnetic valve 6, a power supply 7, a capacitor barrel 41, an upper polar plate 42, a lower polar plate 43 and a suspension plate 44.
Detailed Description
For a further understanding of the present invention, reference is made to the following detailed description taken in conjunction with the accompanying drawings and examples:
a heat recovery boiler drum water level control system comprising: the device comprises a PLC1, a frequency converter 2, a water pump 3, a water level detector 4, a water inlet buffer pool 5, an electromagnetic valve 6 and a power supply 7; the water pump 3 is arranged in a water replenishing pool for the waste heat boiler, a water outlet of the water pump 3 is communicated with a water inlet buffer pool 5, the water inlet buffer pool 5 is communicated with a waste heat boiler steam drum, a solenoid valve 6 is arranged on a pipeline for communicating the water inlet buffer pool 5 with the waste heat boiler steam drum, and the water level detector 4 is arranged in the waste heat boiler steam drum and used for detecting the water level;
PLC1 is respectively with converter 2, water level detection meter 4 and solenoid valve 6 electrical connection, three-phase alternating current is connected to 2 power input ends of converter, and water pump 3 is connected to 2 power output ends of converter, power 7 provides electric power for the operation of PLC1, water level detection meter 4 and solenoid valve 6.
The water level detecting gauge 4 includes: a capacitor bucket 41, an upper polar plate 42, a lower polar plate 43, a suspension plate 44 and a sensor measuring circuit; capacitor bucket 41 is fixed in the inside top of exhaust-heat boiler steam pocket, capacitor bucket 41 is one end opening and the decurrent barreled structure of opening, capacitor bucket 41 upper portion is fixed with upper plate 42, be provided with bottom plate 43 in the capacitor bucket 41 of upper plate 42 below, and bottom plate 43 can slide from top to bottom relatively capacitor bucket 41, bottom plate 43 below is provided with suspension board 44, and is connected through insulating branch between bottom plate 43 and the suspension board 44, upper plate 42 and bottom plate 43 respectively with sensor measuring circuit electrical connection, sensor measuring circuit signal voltage output and PLC1 electrical connection.
Operational amplifier A, fixed capacitor C and power U, operational amplifier A's homophase input end and inverting input end link to each other with the positive negative pole of power U respectively, fixed capacitor C has concatenated on operational amplifier A's the inverting input end circuit, just operational amplifier A inverting input end links to each other with bottom plate 43 is electric, operational amplifier A output and upper polar plate 42 and PLC1 signal input part are electric continuous.
The upper part of the water inlet buffer pool 5 is provided with a water inlet communicated with the water pump 3, and the lower part of the water inlet buffer pool 5 is provided with a water outlet communicated with the waste heat boiler steam drum.
The electromagnetic valve 6 adopts a flow regulating electromagnetic valve.
The utility model discloses specific operation process as follows:
the water level detector 4 measures the liquid level in the steam pocket, the measurement result is detected and analyzed by the PLC1, and the PLC1 controls the water pump 3 to start, stop and rotate at the speed through the frequency converter 2 according to the liquid level height in the steam pocket and the change trend of the liquid level. The electromagnetic valve 6 is controlled by a PLC1 to work in a matched manner, so that the liquid level in the steam drum is kept in a reasonable interval.
The water inlet buffer pool 5 has the function of storing a small amount of water, and the PLC1 can control the electromagnetic valve 6 to carry out micro-control on the liquid level of the steam drum, so that the water pump 3 is prevented from being started frequently.
Claims (5)
1. The utility model provides a waste heat boiler drum water level control system which characterized in that: the method comprises the following steps: the system comprises a PLC (1), a frequency converter (2), a water pump (3), a water level detector (4), a water inlet buffer pool (5), an electromagnetic valve (6) and a power supply (7); the water pump (3) is arranged in a water replenishing pool for the waste heat boiler, a water outlet of the water pump (3) is communicated with a water inlet buffer pool (5), the water inlet buffer pool (5) is communicated with a waste heat boiler steam drum, a solenoid valve (6) is arranged on a pipeline for communicating the water inlet buffer pool (5) with the waste heat boiler steam drum, and the water level detector (4) is arranged in the waste heat boiler steam drum and used for detecting the water level;
PLC (1) links to each other with converter (2), water level detection meter (4) and solenoid valve (6) electricity respectively, three-phase alternating current is connected to converter (2) power input end, and water pump (3) are connected to converter (2) power output end, power (7) provide electric power for PLC (1), water level detection meter (4) and solenoid valve (6) operation.
2. The waste heat boiler drum water level control system of claim 1, characterized in that: the water level detection gauge (4) includes: the device comprises a capacitor barrel (41), an upper polar plate (42), a lower polar plate (43), a suspension plate (44) and a sensor measuring circuit; capacitor bucket (41) are fixed in the inside top of exhaust-heat boiler steam drum, capacitor bucket (41) are one end opening and the decurrent barreled structure of opening, capacitor bucket (41) upper portion is fixed with upper polar plate (42), be provided with bottom plate (43) in capacitor bucket (41) of upper polar plate (42) below, and bottom plate (43) capacitor bucket (41) relatively slide from top to bottom, bottom plate (43) below is provided with suspension board (44), and is connected through insulating branch between bottom plate (43) and suspension board (44), upper polar plate (42) and bottom plate (43) respectively with sensor measuring circuit electrical connection, sensor measuring circuit signal voltage output and PLC (1) electrical connection.
3. The waste heat boiler drum water level control system of claim 2, characterized in that: the sensor measurement circuit includes: operational amplifier A, fixed capacitor C and power U, operational amplifier A's homophase input end and inverting input end link to each other with the positive negative pole of power U respectively, the fixed capacitor C has concatenated on operational amplifier A's the inverting input end circuit, just operational amplifier A inverting input end links to each other with bottom plate (43) electricity, operational amplifier A output links to each other with last polar plate (42) and PLC (1) signal input part electricity.
4. A heat recovery boiler drum water level control system according to any one of claims 1 to 3, characterized in that: the upper part of the water inlet buffer pool (5) is provided with a water inlet communicated with the water pump (3), and the lower part of the water inlet buffer pool (5) is provided with a water outlet communicated with the steam drum of the waste heat boiler.
5. The waste heat boiler drum water level control system of claim 4, characterized in that: the electromagnetic valve (6) adopts a flow regulating electromagnetic valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920133424.3U CN209819523U (en) | 2019-01-25 | 2019-01-25 | Waste heat boiler drum water level control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920133424.3U CN209819523U (en) | 2019-01-25 | 2019-01-25 | Waste heat boiler drum water level control system |
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| Publication Number | Publication Date |
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| CN209819523U true CN209819523U (en) | 2019-12-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920133424.3U Active CN209819523U (en) | 2019-01-25 | 2019-01-25 | Waste heat boiler drum water level control system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112648609A (en) * | 2020-12-26 | 2021-04-13 | 西安西热控制技术有限公司 | Water charging system and water charging structure of thermal power plant |
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2019
- 2019-01-25 CN CN201920133424.3U patent/CN209819523U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112648609A (en) * | 2020-12-26 | 2021-04-13 | 西安西热控制技术有限公司 | Water charging system and water charging structure of thermal power plant |
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