CN213375927U - Coal fired power plant wet flue gas desulfurization limestone slurry pulse control system - Google Patents
Coal fired power plant wet flue gas desulfurization limestone slurry pulse control system Download PDFInfo
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- CN213375927U CN213375927U CN202021008959.7U CN202021008959U CN213375927U CN 213375927 U CN213375927 U CN 213375927U CN 202021008959 U CN202021008959 U CN 202021008959U CN 213375927 U CN213375927 U CN 213375927U
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Abstract
The utility model provides a coal fired power plant wet flue gas desulfurization limestone slurry pulse control system, including limestone slurry flow controller, pulse control module, pneumatic ooff valve and collection module, the pneumatic ooff valve sets up on the defeated thick liquid pipe of limestone slurry pump and desulfurizing tower intercommunication to be connected with the pulse control module electricity; the acquisition module acquires desulfurization parameters, converts the desulfurization parameters into digital signals and transmits the digital signals to the limestone slurry flow controller; the limestone slurry flow controller receives the digital signals of the desulfurization parameters and outputs signals of valve opening time and waiting time to the pulse control module; the pulse control module generates a valve opening period signal and controls the pneumatic switch valve to open and close periodically. The utility model discloses realize that the average flow can be adjusted at certain within range internal smoothness in thick liquid supply, reduce the interior pH of tower and measure hysteresis influence.
Description
Technical Field
The utility model belongs to the technical field of wet flue gas desulfurization technique and specifically relates to a coal fired power plant wet flue gas desulfurization limestone slurry pulse control system is related to.
Background
The current pH control modes in a wet desulphurization system of a power plant are two, firstly, the flow of limestone slurry supply is continuously controlled by controlling a regulating valve so as to maintain the fluctuation of pH within a certain small range, but the regulation valve often works under low flow due to the variable coal types and loads, so that the valve and a pipeline are easily blocked; and secondly, the slurry supply flow is discontinuously controlled by the switch valve to maintain the pH value to fluctuate within the set upper and lower limits, but the pH fluctuation range is easy to be overlarge due to great hysteresis of the rising and the falling of the pH value, so that the operation is not economical.
SUMMERY OF THE UTILITY MODEL
To valve and pipeline often block up among the prior art, the too big problem of pH value fluctuation range, the utility model provides a coal fired power plant wet flue gas desulfurization limestone slurry pulse control method and system realize that the thick liquid supplies average flow can smooth regulation in the certain limit, reduce the interior pH of tower and measure hysteresis influence.
In order to achieve the above object, the present invention provides the following technical solutions:
a coal-fired power plant wet desulphurization limestone slurry pulse control system comprises a limestone slurry flow controller, a pulse control module, a pneumatic valve and an acquisition module, wherein the pneumatic valve is arranged on a slurry conveying pipe communicated with a limestone slurry pump and a desulphurization tower and is electrically connected with the pulse control module; the acquisition module acquires desulfurization system parameters, converts the desulfurization system parameters into digital signals and transmits the digital signals to the limestone slurry flow controller; the limestone slurry flow controller receives digital signals of desulfurization system parameters and outputs signals of valve opening duration and valve closing waiting time to the pulse control module; the pulse control module generates a periodic signal for opening and closing the valve and controls the opening and closing of the pneumatic valve periodically.
The desulfurization parameters comprise the sulfur dioxide concentration and the flue gas volume at the inlet of the desulfurization tower, the pH value of slurry in the desulfurization tower and the slurry density which are measured in real time.
This system adopts the pneumatic valve to control the confession thick liquid, utilize the fast characteristics of pneumatic valve switching speed, through pulse control and the mode control ooff valve of step-by-step sequential control combination, according to the duty cycle of open valve time and latency dynamic adjustment control pulse, follow the principle of mending a lot of less, realize that the thick liquid supplies average flow can smooth regulation in the certain extent, reduce the interior pH of tower and measure the lag influence, and utilize pulse control's effect, prevent that pipeline thick liquid deposit from blockking up, reduce and wash the number of times, be favorable to desulfurization system's water balance.
Each pulse period can be automatically set to be 20-100 seconds according to the coal type and the load, the waiting time is automatically calculated through the coal type, the load and the slurry density, and the duty ratio in each period is controlled to be in the range of 0.1-1, so that the regulating capacity of 10-100% of rated flow can be realized, and a pipeline does not need to be flushed.
Preferably, the acquisition module comprises a first acquisition instrument and a second acquisition instrument, the first acquisition instrument is arranged in an air duct communicated with the induced draft fan and the desulfurizing tower and is used for acquiring the flue gas flow in the air duct and the inlet sulfur dioxide concentration of the desulfurizing tower; the second acquisition instrument is arranged in the desulfurizing tower and is used for acquiring the density and the pH value of the slurry in the desulfurizing tower.
Preferably, the first acquisition instrument comprises a flue gas detection unit and an inlet sulfur dioxide concentration detection unit, the flue gas detection unit acquires the flow of flue gas in the air flue, the inlet sulfur dioxide concentration detection unit acquires the inlet sulfur dioxide concentration of the desulfurizing tower, and the third acquisition instrument is electrically connected with the limestone slurry flow controller.
Preferably, the second collector comprises an in-tower slurry density detection unit and an in-tower slurry pH value detection unit, the in-tower slurry density detection unit collects the density of the slurry in the desulfurization tower, the in-tower slurry pH value detection unit collects the pH value of the slurry in the desulfurization tower, and the third collector is electrically connected with the limestone slurry flow controller.
Preferably, the outlet of the desulfurizing tower is provided with a third acquisition instrument, the third acquisition instrument acquires the concentration of sulfur dioxide at the outlet of the desulfurizing tower, and the third acquisition instrument is electrically connected with the limestone slurry flow controller. The third acquisition instrument is arranged to detect the concentration of sulfur dioxide at the outlet of the desulfurizing tower for calculating the subsequent desulfurizing efficiency.
Preferably, the outlet of the limestone slurry pump is provided with a fourth acquisition instrument, the fourth acquisition instrument acquires the density and the flow of limestone slurry at the outlet of the limestone slurry pump, and the fourth acquisition instrument is electrically connected with the limestone slurry flow controller. The fourth acquisition instrument is arranged to detect limestone slurry in real time, and relevant parameters of the limestone slurry are added into the regulation and control of the limestone slurry flow controller on the pneumatic valve, so that the average slurry supply flow can be regulated smoothly within a certain range.
The utility model discloses there is following beneficial effect: the characteristics that pneumatic valve switching speed is fast are utilized, the switch valve is controlled through the mode that pulse control and stepping sequential control combine, the duty ratio of control pulse is dynamically adjusted according to valve opening time and waiting time, the principle of supplementing for a plurality of times less is followed, the average flow rate of slurry supply can be smoothly adjusted within a certain range, the influence of pH measurement lag in a tower is reduced, the effect of pulse control is utilized, the pipeline slurry is prevented from being deposited and blocked, the washing frequency is reduced, and the water balance of a desulfurization system is facilitated.
Drawings
FIG. 1 is a system configuration diagram of the present embodiment;
wherein: 1. Desulfurizing tower 2, draught fan 3, lime stone thick liquid pump 4, lime stone thick liquid flow controller 5, pulse control module 6, pneumatic valve 7, first collection appearance 8, second collection appearance 9, third collection appearance 10, fourth collection appearance.
Detailed Description
Example (b):
the embodiment provides a limestone slurry pulse control system for wet desulphurization of a coal-fired power plant, and with reference to fig. 1, the limestone slurry pulse control system comprises a limestone slurry flow controller 4, a pulse control module 5, a pneumatic valve 6 and an acquisition module, wherein the pneumatic valve 6 is arranged on a slurry conveying pipe communicated with a limestone slurry pump 3 and a desulphurization tower 1 and is electrically connected with the pulse control module 5; the acquisition module acquires desulfurization system parameters, converts the desulfurization system parameters into digital signals and transmits the digital signals to the limestone slurry flow controller 4; the limestone slurry flow controller 4 receives the digital signals of the desulfurization system parameters and outputs valve opening duration and valve closing waiting time signals to the pulse control module 5; the pulse control module 5 generates a valve opening/closing periodic signal to periodically control the on/off of the pneumatic valve 6.
The collection module comprises a first collection instrument 7 and a second collection instrument 8, the first collection instrument 7 is arranged in an air duct communicated with the draught fan 2 and the desulfurizing tower 1, and is used for collecting the flow of smoke in the air duct and the concentration of sulfur dioxide at the inlet of the desulfurizing tower 1; the second acquisition instrument 8 is arranged in the desulfurizing tower 1 and is used for acquiring the density and the pH value of the slurry in the desulfurizing tower 1. First collection appearance 7 includes flue gas detecting element and entry sulfur dioxide concentration detecting element, and flue gas flow in the flue gas detecting element gathers the wind channel, and entry sulfur dioxide concentration detecting element gathers the entry sulfur dioxide concentration of desulfurizing tower 1, and appearance 7 is connected with 4 electricity of limestone slurry flow controller to the third.
The second acquisition instrument 8 comprises an in-tower slurry density detection unit and an in-tower slurry pH value detection unit, the in-tower slurry density detection unit acquires the density of slurry in the desulfurizing tower 1, the in-tower slurry pH value detection unit acquires the pH value of slurry in the desulfurizing tower 1, and the third acquisition instrument 8 is electrically connected with the limestone slurry flow controller 4. The export of desulfurizing tower 1 is equipped with third collection appearance 9, and the sulfur dioxide concentration of the export of desulfurizing tower 1 is gathered to third collection appearance 9, and third collection appearance 9 is connected with limestone slurry flow controller 4 electricity. The third acquisition instrument 9 is used for detecting the concentration of sulfur dioxide at the outlet of the desulfurizing tower and calculating the subsequent desulfurizing efficiency. The outlet of the limestone slurry pump 3 is provided with a fourth acquisition instrument 10, the fourth acquisition instrument 10 acquires the density and the flow of limestone slurry at the outlet of the limestone slurry pump 3, and the fourth acquisition instrument 10 is electrically connected with the limestone slurry flow controller 4. The fourth acquisition instrument 10 is arranged to detect limestone slurry in real time, and relevant parameters of the limestone slurry are added into the regulation and control of the limestone slurry flow controller 4 on the pneumatic valve, so that the average slurry supply flow can be smoothly regulated within a certain range.
The desulfurization parameters comprise the sulfur dioxide concentration and the flue gas volume at the inlet of the desulfurization tower, the pH value of slurry in the desulfurization tower and the slurry density which are measured in real time.
This system adopts the pneumatic valve to control the confession thick liquid, utilize the fast characteristics of pneumatic valve switching speed, through pulse control and the mode control ooff valve of step-by-step sequential control combination, according to the duty cycle of open valve time and latency dynamic adjustment control pulse, follow the principle of mending a lot of less, realize that the thick liquid supplies average flow can smooth regulation in the certain extent, reduce the interior pH of tower and measure the lag influence, and utilize pulse control's effect, prevent that pipeline thick liquid deposit from blockking up, reduce and wash the number of times, be favorable to desulfurization system's water balance.
Each pulse period can be automatically set to be 20-100 seconds according to the coal type and the load, the waiting time is automatically calculated through the coal type, the load and the slurry density, and the duty ratio in each period is controlled to be in the range of 0.1-1, so that the regulating capacity of 10-100% of rated flow can be realized, and a pipeline does not need to be flushed.
The utility model discloses there is following advantage: the characteristics that pneumatic valve switching speed is fast are utilized, the switch valve is controlled through the mode that pulse control and stepping sequential control combine, the duty ratio of control pulse is dynamically adjusted according to valve opening time and waiting time, the principle of supplementing for a plurality of times less is followed, the average flow rate of slurry supply can be smoothly adjusted within a certain range, the influence of pH measurement lag in a tower is reduced, the effect of pulse control is utilized, the pipeline slurry is prevented from being deposited and blocked, the washing frequency is reduced, and the water balance of a desulfurization system is facilitated.
Claims (6)
1. A coal-fired power plant wet desulphurization limestone slurry pulse control system is characterized by comprising a limestone slurry flow controller (4), a pulse control module (5), a pneumatic valve (6) and an acquisition module,
the pneumatic valve (6) is arranged on a slurry conveying pipe communicated with the limestone slurry pump (3) and the desulfurizing tower (1) and is electrically connected with the pulse control module (5);
the acquisition module acquires desulfurization system parameters, converts the desulfurization system parameters into digital signals and transmits the digital signals to the limestone slurry flow controller (4);
the limestone slurry flow controller (4) receives digital signals of desulfurization system parameters and outputs signals of valve opening duration and valve closing waiting time to the pulse control module (5);
the pulse control module (5) generates a periodic signal for opening and closing the valve and periodically controls the pneumatic valve (6) to open and close.
2. The coal-fired power plant wet desulphurization limestone slurry pulse control system as claimed in claim 1, wherein the collection module comprises a first collection instrument (7) and a second collection instrument (8), the first collection instrument (7) is arranged in an air duct communicated with the draft fan (2) and the desulfurizing tower (1) and is used for collecting the flue gas flow in the air duct and the inlet sulfur dioxide concentration of the desulfurizing tower (1); the second acquisition instrument (8) is arranged in the desulfurizing tower (1) and is used for acquiring the density and the pH value of slurry in the desulfurizing tower (1).
3. The coal-fired power plant wet desulphurization limestone slurry pulse control system as claimed in claim 2, wherein the first acquisition instrument (7) comprises a flue gas detection unit and an inlet sulfur dioxide concentration detection unit, the flue gas detection unit acquires flue gas flow in an air duct, the inlet sulfur dioxide concentration detection unit acquires inlet sulfur dioxide concentration of the desulfurizing tower (1), and the first acquisition instrument (7) is electrically connected with the limestone slurry flow controller (4).
4. The coal-fired power plant wet desulphurization limestone slurry pulse control system according to claim 2, wherein the second acquisition instrument (8) comprises an in-tower slurry density detection unit and an in-tower slurry pH value detection unit, the in-tower slurry density detection unit acquires the density of the slurry in the desulphurization tower (1), the in-tower slurry pH value detection unit acquires the pH value of the slurry in the desulphurization tower (1), and the second acquisition instrument (8) is electrically connected with the limestone slurry flow controller (4).
5. The coal-fired power plant wet desulphurization limestone slurry pulse control system as claimed in claim 1, wherein the outlet of the desulphurization tower (1) is provided with a third acquisition instrument (9), the third acquisition instrument (9) acquires the sulfur dioxide concentration at the outlet of the desulphurization tower (1), and the third acquisition instrument (9) is electrically connected with the limestone slurry flow controller (4).
6. The coal-fired power plant wet desulphurization limestone slurry pulse control system according to claim 1, characterized in that the outlet of the limestone slurry pump (3) is provided with a fourth collecting instrument (10), the fourth collecting instrument (10) collects the density and flow of limestone slurry at the outlet of the limestone slurry pump (3), and the fourth collecting instrument (10) is electrically connected with the limestone slurry flow controller (4).
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| CN202021008959.7U CN213375927U (en) | 2020-06-04 | 2020-06-04 | Coal fired power plant wet flue gas desulfurization limestone slurry pulse control system |
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| CN202021008959.7U CN213375927U (en) | 2020-06-04 | 2020-06-04 | Coal fired power plant wet flue gas desulfurization limestone slurry pulse control system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114749007A (en) * | 2022-04-20 | 2022-07-15 | 保定正德电力技术有限公司 | Automatic control system for wet flue gas desulfurization |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114749007A (en) * | 2022-04-20 | 2022-07-15 | 保定正德电力技术有限公司 | Automatic control system for wet flue gas desulfurization |
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