CN214745673U - Automatic control system of deaerator heating steam regulating valve - Google Patents
Automatic control system of deaerator heating steam regulating valve Download PDFInfo
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- CN214745673U CN214745673U CN202121256028.3U CN202121256028U CN214745673U CN 214745673 U CN214745673 U CN 214745673U CN 202121256028 U CN202121256028 U CN 202121256028U CN 214745673 U CN214745673 U CN 214745673U
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Abstract
The utility model discloses a deaerator heating steam governing valve automatic control system, this system includes deaerator heating steam governing valve control module, deaerator heating steam governing valve control module's input is connected and is set up deaerator steam pressure gauge and deaerator water storage tank thermometer on the deaerator water storage tank, deaerator heating steam governing valve control module's output is connected and is set up the deaerator heating steam governing valve on the steam conduit who is connected with deaerator degasser, deaerator heating steam governing valve control module passes through deaerator steam's pressure and deaerator water storage tank temperature control deaerator heating steam governing valve's aperture, maintain the stability of deaerator steam's pressure and deaerator water storage tank temperature, avoid the heat shock of the metal pipe wall that deaerator water storage tank temperature fluctuation caused greatly.
Description
Technical Field
The utility model belongs to the automatic control field of thermal power factory relates to the oxygen-eliminating device heating control system of boiler. In particular to a system for controlling the heating steam flow based on the temperature and pressure states to realize the automatic control of a deaerator heating steam regulating valve.
Background
The deaerator is a core thermal device of a thermal power plant, and the operation stability of the deaerator directly influences the quality of steam and the economic benefit of the power plant. The deaerator has the main functions of removing oxygen and other non-condensable gases in water supply, ensuring the water supply quality, reducing corrosion and improving the heat conduction efficiency. Meanwhile, the deaerator is also a mixed heater in a regenerative water supply heating system, and plays a role in heating water supply and increasing the temperature of the water supply.
Fig. 1 is a schematic diagram of a typical deaerator heating system of a thermal power plant.
Oxygen-containing water enters a deaerator degassing tower 1 through a deaerator water feeding valve 7 and then reaches a deaerator water storage tank 2. The heating steam enters the deaerator degassing tower 1 through a deaerator heating steam regulating valve 6 to remove oxygen and other non-condensable gases from the feed water in the deaerator water storage tank 2, and simultaneously the feed water is heated and the feed water temperature is increased. The deaerator water storage tank 2 is filled with a mixture of steam, oxygen-containing water and deaerated water. The pressure gauge 3 is used for measuring the pressure Ps of the steam of the deaerator. The thermometer 4 is used for measuring the water temperature Tw of the water storage tank of the deaerator. The water level gauge 5 is used for measuring the water level Lw of the deaerator water storage tank. And a feed pump 8 at the outlet of the bottom of the deaerator water storage tank 2 is used for conveying deaerated water to a boiler feed system.
The water feeding valve 7 of the deaerator controls the water level of the water storage tank of the deaerator measured by the water level meter 5. The deoxygenated water from the bottom of the water storage tank 2 of the deoxygenator directly enters a boiler water feeding pump 8, and the flow rate of the deoxygenated water is controlled by the water consumption of the boiler. In order to facilitate the discharge of the precipitated oxygen, the exhaust valve 9 of the deaerator at the top is normally opened corresponding to the air and is not automatically controlled. The control of the deaerator water feeding valve 7, the boiler water feeding pump 8 and the deaerator exhaust valve 9 at the top is relatively mature, and the control of the deaerator heating steam regulating valve 6 is mainly solved.
Deaerator heating steam governing valve 6 is controlled for controlled object with the temperature Tw of deaerator water storage tank water usually, nevertheless because the temperature variation of deaerator water storage tank water is comparatively slow, when using the temperature as control parameter, the water temperature has reached saturated temperature in the water tank often appearing, after reducing the steam volume, deaerator pressure is low excessively, not only causes a large amount of water vaporization, is unfavorable for appearing the smooth discharge of oxygen moreover, direct influence deoxidization effect. The temperature of the water in the water storage tank of the deaerator is taken as a controlled object to control, so that the steam pressure of the deaerator cannot be guaranteed to be stable, and the temperature Tw of the water in the water storage tank of the deaerator can be changed too fast in the control process, so that thermal shock is caused to a metal pipe of the deaerator.
When water is heated to boiling at atmospheric pressure, the saturation temperature of the water is equal to the atmospheric pressure at the vapor-water interface, and the partial pressures of oxygen and other insoluble components in the water are equal to zero. At this time, the solubility of oxygen in water is drastically reduced and thus oxygen escapes from water, which is the principle of thermal oxygen removal. In order to enable the gas in the deaerator to be smoothly discharged to the atmosphere, the deaerator is kept at a pressure slightly higher than the atmospheric pressure. The pressure in the deaerator is 0.01-0.05 MPa higher than the atmospheric pressure, and the boiling temperature of water under the pressure is 102-110 ℃, namely the stability of the water temperature Tw of a water storage tank of the deaerator and the pressure Ps of steam of the deaerator is ensured. Part of the thermal generator set control system also designs the deaerator heating steam regulating valve 6 to control the deaerator steam pressure Ps. However, in the process of controlling the pressure of the deaerator, the water tank runs at a micro-pressure, so that the pressure cannot be accurately controlled, the steam valve is operated very frequently, and meanwhile, the fluctuation of the water temperature in the deaerator is too large, so that thermal shock is caused to a metal pipe of the deaerator.
The conventional control system and the conventional control method cannot achieve the control target, the thermal shock of the metal pipe wall of the deaerator is caused by the fact that the water temperature Tw of the water storage tank of the deaerator fluctuates greatly, and power plant operators often switch the deaerator heating steam regulating valve into manual control and frequently intervene manually.
Disclosure of Invention
In view of the problem that prior art exists above, the utility model provides a system for realizing oxygen-eliminating device heating steam governing valve automatic control based on temperature, pressure state control heating steam flow realizes the stability control of the pressure Ps of oxygen-eliminating device water storage tank temperature Tw, oxygen-eliminating device steam, avoids the thermal shock of the metal pipe wall that oxygen-eliminating device water storage tank temperature Tw undulant too big arouses.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a deaerator heating steam governing valve automatic control system, including deaerator heating steam governing valve control module 10, deaerator heating steam governing valve control module 10's input is connected and is set up deaerator steam pressure gauge 3 and deaerator water storage tank thermometer 4 on deaerator water storage tank 2, deaerator heating steam governing valve control module 10's output is connected and is set up deaerator heating steam governing valve 6 on the steam conduit of being connected with deaerator degassing tower 1, deaerator heating steam governing valve control module 10 passes through the pressure of deaerator steam and the deaerator water storage tank water temperature control deaerator heating steam governing valve 6's aperture, maintain the stability of the pressure of deaerator steam and deaerator water storage tank temperature.
A deaerator water storage tank water level meter is arranged on the deaerator water storage tank 2, and a water feeding pump 8 is arranged at the bottom of the deaerator water storage tank 2 and connected with a boiler water feeding system.
The deaerator degassing tower 1 is communicated with the oxygen-containing water pipeline through a deaerator water feeding valve 7, a deaerator exhaust valve 9 is arranged at the top of the deaerator degassing tower 1, and the deaerator exhaust valve 9 is normally opened to the air.
The control method of the automatic control system for the deaerator heating steam regulating valve comprises the following steps:
step 1: obtaining the saturation temperature Tws of the steam of the current deaerator according to the pressure Ps of the steam of the deaerator measured by a steam pressure gauge 3 of the deaerator, wherein the Tws is a reference value of a temperature target value controlled by a heating steam regulating valve control module 10 of the deaerator, and an operator corrects the saturation temperature Tws of the steam of the deaerator within a certain range to obtain a water temperature target value Tsp of a water storage tank of the deaerator controlled by the heating steam regulating valve control module 10 of the deaerator; calculating the actual change rate DTw of the water temperature of the water storage tank of the deaerator according to the water temperature Tw of the water storage tank of the deaerator measured by the deaerator temperature meter 4; comparing the target value Tsp of the water temperature in the water storage tank of the deaerator with the water temperature Tw of the water storage tank of the deaerator, and obtaining a target value DTws of temperature change rate according to the difference value delta Tw between the target value Tsp of the water temperature Tw of the water storage tank of the deaerator and the water temperature Tsp of the water storage tank of the deaerator;
step 2: obtaining an opening instruction AO of a heating steam regulating valve of the deaerator according to a difference delta DTw between an actual change rate DTw of the water temperature of a water storage tank of the deaerator and a target value DTws of the temperature change rate; specifically, when the delta DTw is-0.02, keeping the opening instruction AO of the heating steam regulating valve of the current deaerator unchanged; when delta DTw is greater than 0.02, slowly increasing the opening command AO of the deaerator heating steam regulating valve at a certain rate, wherein the command increasing rate is a function of delta DTw; when Δ DTw < -0.02, the deaerator heating steam regulator valve opening command AO is slowly reduced at a rate, and the rate of command reduction is a function of Δ DTw.
When the water temperature Tw of the water storage tank of the deaerator is lower than the target value Tsp of the water temperature of the water storage tank of the deaerator, the control method can realize that the water temperature Tw of the water storage tank of the deaerator is slowly increased to the target value Tsp of the water temperature of the water storage tank of the deaerator at the set target value DTws of the temperature change rate; when the water temperature Tw of the water storage tank of the deaerator is higher than the target value Tsp of the water temperature of the water storage tank of the deaerator, the water temperature Tw of the water storage tank of the deaerator is slowly reduced to the target value Tsp of the water temperature of the water storage tank of the deaerator at a set target value DTws of the temperature change rate; when the water temperature Tw of the water storage tank of the deaerator is consistent with the target value Tsp of the water temperature of the water storage tank of the deaerator, controlling the temperature change rate DTw to be 0 ℃/min, namely maintaining the current water temperature Tw of the water storage tank of the deaerator.
According to the control method, in the whole control process, the opening instruction AO of the deaerator heating steam regulating valve can be slowly opened or closed at the speed of-0.1%/s, the temperature of water in the deaerator water storage tank reaches the target temperature at the temperature change rate of-1 ℃/min, the stable control of the water temperature Tw of the deaerator water storage tank and the pressure Ps of steam of the deaerator is realized in the whole process, and thermal shock of a metal pipe wall caused by overlarge fluctuation of the water temperature Tw of the deaerator water storage tank is avoided.
Compared with the prior art, the utility model discloses possess following advantage:
1. in the heating process of the deaerator, when the target temperature is greatly different from the current temperature, the conventional control system cannot accurately control the temperature change rate in the heating process of the deaerator. The utility model provides a system can realize that oxygen-eliminating device temperature rate of rise control is less than within 1 ℃/min among the oxygen-eliminating device heating process to avoid the thermal shock of the metal pipe wall that oxygen-eliminating device water storage tank temperature rapid change arouses.
2. The utility model provides a deaerator heating steam governing valve control module of system design uses deaerator water storage tank temperature change rate as the controlled object, can show the fluctuation range that reduces the deaerator heating in-process, improves the stability of deaerator steam pressure simultaneously, increases the matching degree of deaerator temperature and pressure, improves the deoxidization effect.
3. The utility model provides a deaerator heating steam governing valve control module of system design controls deaerator temperature change rate also and is close 0 when the deaerator temperature is close the setting value. The utility model provides a conventional PID control system is compared to the system, and the oxygen-eliminating device valve that appears in the accommodation process is undulant and the overshoot scheduling problem of system, reinforcing control system's overall stability can effectively be avoided.
Drawings
Fig. 1 is a schematic diagram of a typical deaerator heating system of a thermal power plant.
Fig. 2 is a schematic diagram of a deaerator heating system and the control system of the utility model is connected.
Fig. 3 is a schematic diagram of the control method of the present invention.
Description of reference numerals:
1 is oxygen-eliminating device degasification tower, 2 is oxygen-eliminating device water storage tank, 3 is oxygen-eliminating device steam pressure table, 4 is oxygen-eliminating device water storage tank thermometer, 5 is oxygen-eliminating device water storage tank fluviograph, 6 is oxygen-eliminating device heating steam governing valve, 7 is the water feeding valve of oxygen-eliminating device, 8 is the water-feeding pump, 9 is oxygen-eliminating device discharge valve, 10 is oxygen-eliminating device heating steam governing valve control module.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 2, oxygen-containing water enters the deaerator degassing tower 1 through a deaerator water feeding valve 7 and then reaches the deaerator water storage tank 2. The heating steam enters the deaerator degassing tower 1 through a deaerator heating steam regulating valve 6 to remove oxygen and other non-condensable gases from the feed water in the deaerator water storage tank 2, and simultaneously the feed water is heated and the feed water temperature is increased. The deaerator water storage tank 2 is filled with a mixture of steam, oxygen-containing water and deaerated water. The deaerator steam pressure gauge 3 is used for measuring the pressure Ps of deaerator steam. The deaerator water storage tank thermometer 4 is used for measuring the deaerator water storage tank water temperature Tw. The deaerator water storage tank water level gauge 5 is used for measuring the water level Lw of the deaerator water storage tank. And a feed pump 8 at the outlet of the bottom of the deaerator water storage tank 2 is used for conveying deaerated water to a boiler feed system.
The pressure Ps of deaerator steam measured by a pressure gauge 3 and the water temperature Tw of a deaerator water storage tank measured by a thermometer 4 are connected into a deaerator heating steam regulating valve control module 10, and the deaerator heating steam regulating valve control module 10 outputs a control instruction to a deaerator heating steam regulating valve 6.
The pressure Ps of deaerator steam obtained by measuring by a deaerator steam pressure gauge 3 and the deaerator water storage tank temperature Tw obtained by measuring by a deaerator water storage tank temperature gauge 4 are connected into a deaerator heating steam regulating valve control module 10, and the deaerator heating steam regulating valve control module 10 outputs an opening instruction AO for controlling a deaerator heating steam regulating valve for controlling the opening of a deaerator heating steam regulating valve 6 and maintaining the stability of the pressure Ps of deaerator steam and the water temperature Tw of the deaerator water storage tank.
And obtaining the saturation temperature Tws of the steam of the current deaerator according to the pressure Ps of the steam of the deaerator measured by the deaerator steam pressure gauge 3. The saturation temperature Tws of the steam of the deaerator is a reference value of a temperature target value controlled by the deaerator heating steam regulating valve control module 10, an operator can correct the saturation temperature Tws of the steam of the deaerator within a certain range, for example, the saturation temperature Tws is corrected within a range of-20 to +20 ℃ to obtain a water temperature target value Tsp of a deaerator water storage tank controlled by the deaerator heating steam regulating valve control module 10, an actual change rate DTw of the water temperature of the deaerator water storage tank is calculated according to the water temperature Tw of the deaerator water storage tank measured by the deaerator water storage tank thermometer 4, the water temperature target value Tsp of the deaerator water storage tank is compared with the water temperature Tw of the deaerator water storage tank, and a temperature change rate target value DTws is obtained according to a difference value delta Tw (delta Tw-Tsp) between the water temperature Tw of the deaerator water storage tank and the temperature target value Tsp.
And obtaining an opening command AO of the deaerator heating steam regulating valve according to a difference value delta DTw (delta DTw is DTw-DTws) between the actual change rate DTw of the water temperature of the deaerator water storage tank and a temperature change rate target value DTws. Specifically, when the delta DTw is-0.02, keeping the opening instruction AO of the heating steam regulating valve of the current deaerator unchanged; when delta DTw is greater than 0.02, slowly increasing the opening command AO of the deaerator heating steam regulating valve at a certain rate, wherein the command increasing rate is a function of delta DTw; when Δ DTw < -0.02, the deaerator heating steam regulator valve opening command AO is slowly reduced at a rate, and the rate of command reduction is a function of Δ DTw.
The embodiment of the invention provides a system and a method for automatically controlling a heating steam regulating valve of a deaerator based on temperature and pressure states, wherein the system and the method are as shown in fig. 3, and specifically comprise the following steps:
1. deoxygenation is obtained according to the pressure Ps of the deaerator steam measured by the deaerator steam pressure gauge 3The saturation temperature Tws of the vessel vapor in units of ℃. I.e. the saturation temperature Tws of the deaerator steam as a function of the deaerator steam pressure Ps, Tws ═ F1(Ps). The specific functional relationship can be seen in a comparison table of saturated steam temperature of deaerator steam and pressure of deaerator steam, and a typical functional relationship between Tws and Ps is shown in table 1 below.
TABLE 1
2. The saturation temperature Tws of the deaerator steam is a temperature target value benchmark controlled by the deaerator heating steam regulating valve control module 10. The operator can correct Tws within a certain range, for example, within a range of-20 to +20 ℃, to obtain a target value Tsp of the water temperature of the deaerator water storage tank controlled by the deaerator heating steam regulating valve control module 10, which is unit ℃.
3. And calculating the actual change rate of the water temperature of the water storage tank of the deaerator, namely DTw in unit ℃/min according to the measured water temperature Tw of the water storage tank of the deaerator and the thermometer 4.
4. And obtaining a target temperature change rate DTws with unit ℃/min according to the difference value delta Tw (delta Tw is Tw-Tsp) between the water temperature Tw of the deaerator water storage tank and the target water temperature Tsp of the deaerator water storage tank. That is, the target value DTws of the temperature change rate is a function of the temperature difference Δ Tw, where DTws is F2(. DELTA.Tw). DTws is typically a function of Δ Tw as shown in the following table.
TABLE 2
| △Tw | DTws(℃/min) |
| <-2 | 1 |
| -2～-0.5 | -0.5*△Tw |
| -0.5～0.5 | 0 |
| 0.5～2 | -0.5*△Tw |
| >2 | -1 |
Namely, if the difference value delta Tw between the water temperature Tw of the water storage tank of the deaerator and the target value Tsp of the water temperature of the water storage tank of the deaerator is larger, the target value DTws of the temperature change rate is smaller; the smaller the Δ Tw, the larger the target value DTws of the temperature change rate, and the target value DTws of the temperature change rate is in the range of-1 to 1 ℃/min.
5. And obtaining the change rate dO of the opening command of the deaerator heating steam regulating valve according to the difference value delta DTw (delta DTw is DTw-DTws) between the actual change rate DTw of the water temperature of the deaerator water storage tank and the target value DTws of the temperature change rate. That is, the change rate dO of the opening command of the deaerator heating steam regulating valve is a functional relation of a temperature change rate difference delta DTw, and dO is F3(. DELTA. DTw). A typical functional relationship between dO and Δ DTw is shown in the following table.
TABLE 3
| △DTw | dO(％/s) |
| <-1 | 0.1 |
| -0.02～1 | △DTw×(-0.1) |
| -0.02～0.02 | 0 |
| 0.02～1 | △DTw×(-0.1) |
| >1 | -0.1 |
6. Based on the above table, when the delta DTw is-0.02, keeping the opening instruction AO of the heating steam regulating valve of the current deaerator unchanged; when delta DTw is greater than 0.02, slowly increasing the opening command AO of the deaerator heating steam regulating valve at a dO (%/s) rate; when Δ DTw < -0.02, the deaerator heating steam regulator opening command AO is slowly reduced at a rate of dO (%/s). The change rate dO of the opening instruction AO of the deaerator heating steam regulating valve is controlled to be-0.1%/s. Namely, in the whole control process, the opening instruction AO of the deaerator heating steam regulating valve is slowly opened or slowly closed within the range of 0-100%.
The utility model provides a pair of realize oxygen-eliminating device heating steam governing valve automatic control's system and method based on temperature, pressure state control heating steam flow, when oxygen-eliminating device water storage tank temperature Tw is less than oxygen-eliminating device water storage tank water temperature target value Tsp, can realize that oxygen-eliminating device water storage tank water temperature Tw slowly risees to oxygen-eliminating device water storage tank water temperature target value Tsp with the temperature rate of change DTws of settlement. When the water temperature Tw of the water storage tank of the deaerator is higher than the target value Tsp of the water temperature of the water storage tank of the deaerator, the water temperature Tw of the water storage tank of the deaerator is slowly reduced to the target value Tsp of the water temperature of the water storage tank of the deaerator at a set temperature change rate DTws. When the water temperature Tw of the water storage tank of the deaerator is consistent with the target value Tsp of the water temperature of the water storage tank of the deaerator, controlling the temperature change rate DTw to be 0 ℃/min, namely maintaining the current water temperature Tw of the water storage tank of the deaerator.
The utility model provides a pair of system and method based on temperature, pressure state control heating steam flow realize oxygen-eliminating device heating steam governing valve automatic control, the aperture instruction of oxygen-eliminating device heating steam governing valve can be opened big slowly or slowly close little with-0.1 ~ 0.1%/s' speed in whole control process. The method has the advantages that the temperature of water in the water storage tank of the deaerator reaches the target temperature at the temperature change rate of-1 ℃/min, the stable control of the water temperature Tw of the water storage tank of the deaerator and the pressure Ps of steam of the deaerator is realized in the whole process, and thermal shock of a metal pipe wall caused by overlarge fluctuation of the water temperature Tw of the water storage tank of the deaerator is avoided.
Claims (3)
1. The utility model provides a deaerator heating steam governing valve automatic control system, a serial communication port, including deaerator heating steam governing valve control module (10), deaerator steam pressure gauge (3) and deaerator water storage tank thermometer (4) of setting on deaerator water storage tank (2) are connected to the input of deaerator heating steam governing valve control module (10), deaerator heating steam governing valve (6) of setting on the steam conduit who is connected with deaerator degassing tower (1) are connected to the output of deaerator heating steam governing valve control module (10), deaerator heating steam governing valve control module (10) are through the pressure of deaerator steam and the aperture of deaerator water storage tank temperature control deaerator heating steam governing valve (6), maintain the stability of the pressure of deaerator steam and deaerator water storage tank temperature.
2. The automatic control system of the heating steam regulating valve of the deaerator as claimed in claim 1, characterized in that a deaerator water storage tank water level meter is arranged on the deaerator water storage tank (2), and a water feeding pump (8) is arranged at the bottom of the deaerator water storage tank (2) and connected with a boiler water feeding system.
3. The automatic control system of a heating steam regulating valve of a deaerator as claimed in claim 1, characterized in that a deaerator degassing tower (1) is communicated with an oxygen-containing water pipeline through a deaerator water feeding valve (7), a deaerator exhaust valve (9) is arranged at the top of the deaerator degassing tower (1), and the deaerator exhaust valve (9) is normally open to the air.
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| CN202121256028.3U CN214745673U (en) | 2021-06-04 | 2021-06-04 | Automatic control system of deaerator heating steam regulating valve |
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| CN202121256028.3U CN214745673U (en) | 2021-06-04 | 2021-06-04 | Automatic control system of deaerator heating steam regulating valve |
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