CN210219728U - Continuous water supply control signal acquisition device for fuel oil and gas steam boiler - Google Patents
Continuous water supply control signal acquisition device for fuel oil and gas steam boiler Download PDFInfo
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- CN210219728U CN210219728U CN201920827712.9U CN201920827712U CN210219728U CN 210219728 U CN210219728 U CN 210219728U CN 201920827712 U CN201920827712 U CN 201920827712U CN 210219728 U CN210219728 U CN 210219728U
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Abstract
The utility model discloses a fuel gas steam boiler control signal acquisition device that feeds water in succession, including a water level measurement section of thick bamboo, limit low water level electrode, low warning water level electrode, low water level electrode, well water level electrode, high warning water level electrode. The water level sensor required by the utility model is a water level electrode, the corresponding relation between the electrode length and the water level is clear, and the debugging is not needed; the price of 6 electrodes is far lower than that of a micro differential pressure transmitter.
Description
Technical Field
The utility model relates to a fuel gas steam boiler control device that feeds water in succession belongs to boiler automatic control field.
Background
1. The steam boiler continuously feeds water, and the traditional mode is as follows: the water level of the boiler steam drum is measured by adopting a micro-differential pressure transmitter, and then the water supply frequency converter is controlled by a PID adjusting instrument to stabilize the water level at the central water level.
2. Above-mentioned scheme, little differential pressure transmitter and adjusting instrument, the price is in thousands yuan, and the cost is higher, and the field debugging is more complicated.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: in order to reduce the cost of the traditional continuous water supply control scheme and realize the debugging-free, the utility model provides a continuous water supply control signal acquisition device of a fuel oil gas steam boiler.
The technical scheme is as follows: in order to achieve the above object, the utility model adopts the following technical scheme:
a continuous water supply control signal acquisition device of a fuel gas steam boiler comprises a water level measuring cylinder, a limit low water level electrode, a low alarm water level electrode, a low water level electrode, a medium water level electrode, a high alarm water level electrode and a high alarm water level electrode, wherein the water level measuring cylinder is sequentially provided with a low water level line, a target water level line and a high water level line from bottom to top, the limit low water level electrode, the low alarm water level electrode, the low water level electrode, the medium water level electrode, the high water level electrode and the high alarm water level electrode are arranged in the water level measuring cylinder, the lowest end of the limit low water level electrode, the lowest end of the low alarm water level electrode, the lowest end of the medium water level electrode, the lowest end of the high alarm water level electrode and the lowest end of the medium water level electrode are sequentially arranged from low to high, the lowest end of the low water level electrode is positioned on the low water level line, the lowest end of the medium water level electrode is positioned, the lowest end of the high water level electrode is positioned on the high water level line.
Preferably: the electrode lengths of the limit low water level electrode, the low alarm water level electrode, the low water level electrode, the middle water level electrode, the high water level electrode and the high alarm water level electrode are reduced in sequence.
Compared with the prior art, the utility model, following beneficial effect has:
the water level sensor required by the utility model is a water level electrode, the corresponding relation between the electrode length and the water level is clear, and the debugging is not needed; the utility model discloses a water level information propelling movement that 6 electrodes will gather gives main control MCU, and main control MCU controls the feedwater converter according to water level information, because 6 electrode prices are far less than differential pressure transmitter, consequently the utility model discloses the low price. When the steam output of the boiler is stable, the main control MCU only needs to capture two overshoot events, the matched frequency of the water supply frequency converter can be calculated, and the response speed is high.
Drawings
FIG. 1 is a schematic view of the structure of the present invention
Detailed Description
The invention will be further elucidated with reference to the drawings and specific embodiments, it being understood that these examples are intended to illustrate the invention only and are not intended to limit the scope of the invention, and that modifications to the various equivalent forms of the invention, which may occur to those skilled in the art after reading the present invention, fall within the scope of the invention as defined in the claims appended hereto.
A continuous water supply control signal acquisition device of a fuel oil and gas steam boiler comprises a water level measuring cylinder 1, a limit low water level electrode 21, a low alarm water level electrode 22, a low water level electrode 23, a middle water level electrode 24, a high water level electrode 25 and a high alarm water level electrode 26, wherein the water level measuring cylinder 1 is sequentially provided with a low water level line 12, a target water level line 11 and a high water level line 13 from bottom to top, the limit low water level electrode 21, the low alarm water level electrode 22, the low water level electrode 23, the middle water level electrode 24, the high water level electrode 25 and the high alarm water level electrode 26 are arranged in the water level measuring cylinder 1, the lowest end of the limit low water level electrode 21, the lowest end of the low alarm water level electrode 22, the lowest end of the low water level electrode 23, the lowest end of the middle water level electrode 24, the lowest end of the high water level electrode 25 and the lowest end of the high alarm water level electrode 26 are sequentially arranged from low, the lowest end of the low water level electrode 23 is located on the low water level line 12, the lowest end of the middle water level electrode 24 is located on the target water level line 11, and the lowest end of the high water level electrode 25 is located on the high water level line 13. The electrode lengths of the limit low water level electrode 21, the low alarm water level electrode 22, the low water level electrode 23, the middle water level electrode 24, the high water level electrode 25 and the high alarm water level electrode 26 are reduced in sequence. The limit low water level electrode 21, the low alarm water level electrode 22, the low water level electrode 23, the middle water level electrode 24, the high water level electrode 25 and the high alarm water level electrode 26 are all connected with a main control MCU, the main control MCU is connected with a water supply frequency converter, and the main control MCU adopts an STM32F103VET6 chip or an STM32F103ZET6 chip.
As shown in fig. 1, the water level was measured using a 6 electrode combination. Signals collected by the low water level electrode 23, the middle water level electrode 24 and the high water level electrode 25 are control signals, and signals collected by the limit low water level electrode 21, the low alarm water level electrode 22 and the high alarm water level electrode 26 are signals for alarm protection.
When the water level is lower than the low water level line, the main control MCU controls the frequency converter to work at the upper limit frequency, and when the water level rises to the middle water level line, the frequency converter is switched to work at the matched frequency.
When the water level is higher than the high water level line, the main control MCU controls the frequency converter to work at a lower limit frequency, and when the water level is reduced to the middle water level line, the frequency converter is switched to work at a matched frequency.
When the water level rises from the middle water level to the high water level, defining the water level as an overshoot event; when the water level drops from the "mid water line" to the "low water line", an undershoot event is defined.
The purpose of continuous water supply control is to calculate the frequency matched with a water supply frequency converter, so that the water supply quantity is equal to the steam output quantity, and the water level is stabilized near a middle water level line, so that the stable operation of the boiler and the steam quality are ensured.
The main control MCU is embedded with the following algorithm, records two continuous events, and can calculate the frequency of the currently matched water supply frequency converter according to the combination of the two events.
f 1-event 1 operating frequency f 2-event 2 operating frequency
t 1-event 1 duration t 2-event 2 duration
f 0-matched operating frequency
1. Event combination: upper punch and upper punch
(f1-f0)t1＝(f2-f0)t2
f0＝(f2t2-f1t1)/(t2-t1)
2. Event combination: up-stroke and down-stroke
(f1-f0)t1＝(f0-f2)t2
f0＝(f2t2+f1t1)/(t2+t1)
3. Event combination: undershoot + undershoot
(f0-f1)t1＝(f0-f2)t2
f0＝(f1t1-f2t2)/(t1-t2)
4. Event combination: undershoot and overshoot
(f0-f1)t1＝(f2-f0)t2
f0＝(f1t1+f2t2)/(t1+t2)
The device only has 6 water level electrodes to collect water level signals as input signals, belongs to a switching value measuring mode, and is simple in circuit. And the water supply frequency converter responds to the standard signal and correspondingly outputs the frequency of 0-50 Hz. Because the water level of the boiler always has certain fluctuation, in order to avoid the misoperation of the main control MCU, the main control MCU needs to carry out necessary filtering processing on the measured water level of the boiler, and then the current matched water supply frequency is calculated according to the formula by combining the time characteristic of the water level change, and then the control signal of the water supply frequency converter is formed through the transmission output circuit.
The above description is only a preferred embodiment of the present invention, and it should be noted that: for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present invention.
Claims (2)
1. The continuous water supply control signal acquisition device for the fuel oil gas steam boiler is characterized in that: the water level measuring device comprises a water level measuring cylinder (1), a limit low water level electrode (21), a low alarm water level electrode (22), a low water level electrode (23), a medium water level electrode (24), a high water level electrode (25) and a high alarm water level electrode (26), wherein the water level measuring cylinder (1) is sequentially provided with a low water level line (12), a target water level line (11) and a high water level line (13) from bottom to top, the limit low water level electrode (21), the low alarm water level electrode (22), the low water level electrode (23), the medium water level electrode (24), the high water level electrode (25) and the high alarm water level electrode (26) are arranged in the water level measuring cylinder (1), and the lowest end of the limit low water level electrode (21), the lowest end of the low alarm water level electrode (22), the lowest end of the low water level electrode (23), the lowest end of the medium water level electrode (24) and the lowest end of the high water, The lowest ends of the high alarm water level electrodes (26) are sequentially arranged from low to high, the lowest end of the low water level electrode (23) is located on the low water level line (12), the lowest end of the medium water level electrode (24) is located on the target water level line (11), and the lowest end of the high water level electrode (25) is located on the high water level line (13).
2. The continuous water supply control signal acquisition device of the fuel-oil-gas steam boiler as claimed in claim 1, wherein: the electrode lengths of the limit low water level electrode (21), the low alarm water level electrode (22), the low water level electrode (23), the middle water level electrode (24), the high water level electrode (25) and the high alarm water level electrode (26) are reduced in sequence.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920827712.9U CN210219728U (en) | 2019-06-04 | 2019-06-04 | Continuous water supply control signal acquisition device for fuel oil and gas steam boiler |
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| CN201920827712.9U CN210219728U (en) | 2019-06-04 | 2019-06-04 | Continuous water supply control signal acquisition device for fuel oil and gas steam boiler |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114158234A (en) * | 2021-10-27 | 2022-03-08 | 淮北矿业股份有限公司 | Method for protecting new main well condensate water and external water cooling water |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114158234A (en) * | 2021-10-27 | 2022-03-08 | 淮北矿业股份有限公司 | Method for protecting new main well condensate water and external water cooling water |
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