CN210400532U - Liquid level detection device for steam turbine water recovery device - Google Patents
Liquid level detection device for steam turbine water recovery device Download PDFInfo
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- CN210400532U CN210400532U CN201921101917.5U CN201921101917U CN210400532U CN 210400532 U CN210400532 U CN 210400532U CN 201921101917 U CN201921101917 U CN 201921101917U CN 210400532 U CN210400532 U CN 210400532U
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Abstract
The utility model discloses a liquid level detection device of a steam turbine water recovery device, which comprises a vapor phase side pressure detection transmitter, a liquid phase side pressure detection transmitter, a vapor phase side temperature detection element, a liquid phase side temperature detection element and a signal acquisition and calculation unit; the vapor phase side pressure detection transmitter and the vapor phase side temperature detection element are arranged on the vapor phase side of a condensate water collection tank for rehydration of the steam turbine; the liquid phase side pressure detection transmitter and the liquid phase side temperature detection element are arranged at a liquid level detection zero point of a liquid level of a condensed water collecting tank of the steam turbine water recovery device; the vapor-phase side pressure detection transmitter, the liquid-phase side pressure detection transmitter, the vapor-phase side temperature detection element and the liquid-phase side temperature detection element are respectively and electrically connected with the signal acquisition and calculation unit so as to respectively input detection signals into the signal acquisition and calculation unit for calculation. The utility model discloses a steam turbine rehydration device liquid level detection device can reduce the error influence that the measurement produced.
Description
Technical Field
The utility model discloses measure and detect technical field, especially relate to a steam turbine rehydration device liquid level detection device.
Background
A condensing steam turbine condenser (also called a water collector) converts steam discharged from a steam turbine into condensed water, and a condenser hot well (a water collection tank) collects the generated condensed water. The liquid level of the water recovery device is kept within a certain range as required, if the water level is too high, the condensation effect of steam is influenced, the reduction of the vacuum degree in the condenser is caused, the heat efficiency of a steam turbine is reduced, if the water level is too low, a condensation pump is easy to generate cavitation corrosion, meanwhile, the deoxidization effect of the condenser is also influenced, and the corrosion of the condenser is accelerated. The accurate measurement value of the liquid level of the steam turbine water recovery device is one of important detection and control parameters of the operation of the steam turbine, and the static pressure type measurement method which is commonly used at present adopts a balance container and a differential pressure transmitter which are communicated with the water recovery device to carry out measurement. When the temperature of the liquid in the balancing container is different from that of the liquid in the tested water-returning device, the liquid level measured by the differential pressure transmitter is different from the actual liquid level in the water-returning device, and the error of the liquid level measured by the differential pressure transmitter is changed along with the change of the pressure and the temperature in the water-returning device, because the load of the steam turbine unit fluctuates, the pressure and the temperature of the water-returning device are continuously changed, and the density of steam and condensed water in the water-returning device is also changed, thereby influencing the accuracy of water level measurement and the operation of automatic control of water level regulation.
(1) The existing liquid level detection technical method comprises the following steps:
① patent technology of steam turbine condensed water hot well water level monitoring device (application No. CN201410353185 publication No. CN104121960A) of Yonggang Steel Limited in Jiangsu relates to a steam turbine condensed water hot well water level monitoring device for a thermal power plant, which comprises a hot well water level container for collecting condensed water condensed by a steam turbine condenser, wherein an upper opening and a lower opening are respectively arranged at the upper end and the lower end of the outer wall of the hot well water level container, the upper opening is communicated with the upper balancing container, the lower opening is communicated with the lower balancing container, the upper balancing container and the lower balancing container are respectively connected with a differential pressure transmitter through connecting pipelines, and the differential pressure transmitter is connected with a PLC control system.
② Guangan electric power generation Limited liability company, a differential pressure type liquidometer (application number CN201820173403 publication (Notification) number CN207937031U), relates to the technical field of liquidometers, in particular to a differential pressure type liquidometer, which comprises a differential pressure sensing device, a balance container, a pressure guide pipe and a communicating pipe, wherein the communicating pipe comprises a liquid part communicating pipe and a vapor part communicating pipe, the liquid part communicating pipe is communicated with the bottom of a container to be measured and horizontally extends to be communicated with a negative pressure conduit, the vapor part communicating pipe is communicated with the upper part of the container to be measured and horizontally extends to be communicated with the top of the side wall of the balance container, the pressure guide pipe comprises a positive pressure conduit and a negative pressure conduit, the positive pressure conduit is communicated with the bottom of the balance container and downwardly extends to be communicated with the positive pressure side of the differential pressure sensing device, the negative pressure conduit is communicated with the negative pressure side of the differential pressure sensing device and upwardly extends to be sequentially communicated with the liquid part communicating pipe and the vapor part, and the differential pressure type liquidometer is provided with the vapor.
③ Tubi-Domo group Limited company CN201811404692 published CN109387258A belongs to the technical field of heat exchanger condensed water level control and is suitable for measuring the condensed water level of a basic heat exchanger by an intelligent differential pressure transmitter in a municipal heating system of a thermal power plant.A system for measuring the condensed water level of the heat exchanger by the differential pressure transmitter is provided with a double-chamber balance container on the heat exchanger, the positive pressure end of the intelligent differential pressure transmitter is connected into the inner chamber and the negative pressure end of the double-chamber balance container is connected into the outer chamber, the outer chamber is filled with the measured liquid, the intelligent differential pressure transmitter is set to output a 20mA current signal when delta p is 0, the intelligent differential pressure transmitter outputs a 4mA current signal when delta p is-rho gL, the method for controlling the condensed water level of the heat exchanger by the differential pressure transmitter is provided, the method for setting the differential pressure transmitter to output a 20mA current signal when delta p is 0, outputting a 4mA current signal when delta p is-rho gL, filling the outer chamber into the differential pressure transmitter, and keeping the condensed water pump in a closed state when delta p is 0.
There are problems and deficiencies:
① and ② are actually differential pressure type liquid level detection methods using a single-chamber balance container, ③ is actually differential pressure type liquid level detection methods using a double-chamber balance container, in these methods, if the output pressure difference Δ p of the balance container is only related to the water level H, the density ρ 1 of condensed water in the balance container, the density ρ 'of condensed water on the liquid phase side in the water recovery device and the density ρ ″ of steam on the steam phase side in the water recovery device are kept unchanged, but the measurement errors are caused by the changes of the working pressure of the water recovery device and the ambient temperature, which can cause the changes of ρ 1, ρ' and ρ ″.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a steam turbine rehydration device liquid level detection device reduces the error influence that the measurement produced.
In order to solve the technical problem, the utility model adopts the following technical scheme:
a liquid level detection device of a steam turbine water recovery device comprises a vapor phase side pressure detection transmitter, a liquid phase side pressure detection transmitter, a vapor phase side temperature detection element, a liquid phase side temperature detection element and a signal acquisition and calculation unit;
the vapor phase side pressure detection transmitter and the vapor phase side temperature detection element are arranged on the vapor phase side of a condensate water collection tank for rehydration of the steam turbine; the liquid phase side pressure detection transmitter and the liquid phase side temperature detection element are arranged at a liquid level detection zero point of a liquid level of a condensed water collecting tank of the steam turbine water recovery device;
the vapor-phase side pressure detection transmitter, the liquid-phase side pressure detection transmitter, the vapor-phase side temperature detection element and the liquid-phase side temperature detection element are respectively and electrically connected with the signal acquisition and calculation unit so as to respectively input detection signals into the signal acquisition and calculation unit for calculation.
Further, the vapor phase side pressure detection transmitter and the liquid phase side pressure detection transmitter are high-precision direct-mounted absolute pressure transmitters.
Furthermore, the liquid phase side pressure detection transmitter is a high temperature resistant high precision direct-mounted absolute pressure transmitter.
Further, the vapor-phase side temperature detection element and the liquid-phase side temperature detection element are armored platinum thermistor thermometers.
Furthermore, the signal acquisition and calculation unit comprises a power distribution isolator, a temperature transmitter and a PLC system.
Further, the PLC system can be replaced by a DCS system.
Compared with the prior art, the utility model discloses a beneficial technological effect:
the invention does not adopt a balance container for detection, but directly measures the gas phase side pressure, the liquid phase side pressure, the gas phase side temperature and the liquid phase side temperature of the water recovery device according to the hydrostatic basic equation p which is p0+ rho gh, inputs all detection parameter signals into a PLC (or DCS) system, obtains the density of the steam at the gas phase side and the liquid phase side condensed water according to the relation between the gas phase side pressure, the liquid phase side pressure, the temperature and the density in the water recovery device, and finally calculates the liquid level of the water recovery device under the real-time condition, thereby realizing the accurate detection of the liquid level of the water recovery device.
The problem of steam turbine water recovery ware liquid level detection is solved. The detection of the water replenisher can be carried out without adopting a balance container, the error influence generated by measurement is reduced, and the accurate detection of the liquid level of the water replenisher is realized. The device has the characteristics of less equipment, simple logical structure and simple and convenient maintenance, and can be popularized and applied to the liquid level measurement of various complex-change closed containers such as boiler drums, high-pressure and low-pressure heaters and the like.
Drawings
The present invention will be further explained with reference to the following description of the drawings.
FIG. 1 is a schematic structural view of the liquid level detection device of the steam turbine water collector of the present invention;
description of reference numerals: 1-steam turbine water recovery device, 2-condensate water collection tank, 3-water recovery device condensate water liquid level, 4-vapor phase side pressure detection transmitter, 5-liquid phase side pressure detection transmitter, 6-vapor phase side temperature detection element, 7-liquid phase side temperature detection element and 8-signal acquisition and calculation unit.
Detailed Description
As shown in fig. 1, a liquid level detection device for a steam turbine water collector comprises a steam turbine water collector 1 (condenser), a condensate water collection tank 2 (hot well), a vapor-phase side pressure detection transmitter 4, a liquid-phase side pressure detection transmitter 5, a vapor-phase side temperature detection element 6, a liquid-phase side temperature detection element 7 and a signal acquisition and calculation unit 8; the vapor phase side pressure detection transmitter 4 and the vapor phase side temperature detection element 6 are installed on the vapor phase side of a condensed water collecting tank (hot well) 2 of the steam turbine condenser (water recovery device) 1 on site; the liquid phase side pressure detection transmitter 5 and the liquid phase side temperature detection element 7 are arranged at a liquid level detection zero point of a liquid level of a condensed water collection tank (hot well) 2 of a steam turbine condenser (water recovery device) 1; the vapor phase side pressure detection transmitter 4 and the liquid phase side pressure detection transmitter 5 select a high-precision direct-mounted absolute pressure transmitter for ensuring the detection precision requirement; the liquid phase side pressure detection transmitter 5 can also be a high temperature resistant high precision direct-mounted absolute pressure transmitter; the vapor-phase side temperature detection element 6 and the liquid-phase side temperature detection element 7 are armored platinum thermal resistance thermometers; detection signals of the vapor-phase side pressure detection transmitter 4, the liquid-phase side pressure detection transmitter 5, the vapor-phase side temperature detection element 6 and the liquid-phase side temperature detection element 7 are respectively input to the signal acquisition and calculation unit 8 for calculation; the signal acquisition and calculation unit 8 mainly comprises a power distribution isolator, a temperature transmitter, a PLC (or DCS) system and the like.
The circuit structure and the connection structure of the specific circuit thereof involved in the present invention are conventional technical means in the field, and are not described in detail again.
The calculation performed by the signal acquisition calculation unit 8 is described below with reference to fig. 1:
according to the hydrostatic basic equation p-p 0+ ρ gh, there is equation 1:
pliquid for treating urinary tract infection＝pSteam generator+ρSteam generatorg(H-h)+ρLiquid for treating urinary tract infectiongh
And (3) converting to obtain a calculation formula 2 of the liquid level of the water recovery device:
in the formula: the liquid p is the pressure at the zero liquid level of the liquid level detection of the steam turbine water recovery device;
p steam is the steam-phase side pressure of the steam turbine water returning device;
rho liquid is the density of condensed water on the liquid phase side of the steam turbine water recovery device;
rho steam is the density of steam at the steam phase side of the steam turbine water recovery device;
g is the local gravitational acceleration;
h is the liquid level range of the liquid level detection of the water recovery device;
h is the liquid level of the water recovery device, namely the distance from the condensate water liquid level 3 of the water recovery device to the liquid level zero point.
H is the distance from the zero liquid level of the water recovery device liquid level detection to the highest liquid level of the liquid level detection, and is a known value; g is also a known value. It can be derived from equation 2 that the level h of the water trap is a function of p liquid, p vapor, ρ liquid and ρ vapor. The p liquid can be obtained by measuring through a pressure detection transmitter arranged at a zero liquid level of the liquid level detection of the liquid phase side of the steam turbine water recovery device; p steam can be obtained by measuring through a pressure detection transmitter arranged on the steam phase side of the steam turbine water recovery device; the rho liquid and the rho steam can be obtained by using the vapor temperature and the liquid-phase side condensation water temperature of the water recovery device measured by the vapor-phase side temperature detection element and the liquid-phase side temperature detection element of the water recovery device and the p liquid and the p steam measured by the pressure transmitter and calculating by using the relation between the pressure of the vapor and the condensation water, the temperature and the density through a PLC (or DCS) system in the signal acquisition and calculation unit 8, so that the real-time height of the liquid level h of the water recovery device can be calculated by using the formula 2.
The invention does not adopt a balance container for detection, but directly measures the gas phase side pressure, the liquid phase side pressure, the gas phase side temperature and the liquid phase side temperature of the water recovery device according to the hydrostatic basic equation p which is p0+ rho gh, inputs all detection parameter signals into a PLC (or DCS) system, obtains the density of the steam at the gas phase side and the liquid phase side condensed water according to the relation between the gas phase side pressure, the liquid phase side pressure, the temperature and the density in the water recovery device, and finally calculates the liquid level of the water recovery device under the real-time condition, thereby realizing the accurate detection of the liquid level of the water recovery device.
The above-mentioned embodiments are only intended to describe the preferred embodiments of the present invention, but not to limit the scope of the present invention, and those skilled in the art should also be able to make various modifications and improvements to the technical solution of the present invention without departing from the spirit of the present invention, and all such modifications and improvements are intended to fall within the scope of the present invention as defined in the appended claims.
Claims (6)
1. The utility model provides a steam turbine water catcher liquid level detection device which characterized in that: the device comprises a vapor-phase side pressure detection transmitter, a liquid-phase side pressure detection transmitter, a vapor-phase side temperature detection element, a liquid-phase side temperature detection element and a signal acquisition and calculation unit;
the vapor phase side pressure detection transmitter and the vapor phase side temperature detection element are arranged on the vapor phase side of a condensate water collection tank for rehydration of the steam turbine; the liquid phase side pressure detection transmitter and the liquid phase side temperature detection element are arranged at a liquid level detection zero point of a liquid level of a condensed water collecting tank of the steam turbine water recovery device;
the vapor-phase side pressure detection transmitter, the liquid-phase side pressure detection transmitter, the vapor-phase side temperature detection element and the liquid-phase side temperature detection element are respectively and electrically connected with the signal acquisition and calculation unit so as to respectively input detection signals into the signal acquisition and calculation unit for calculation.
2. The steam turbine water catcher liquid level detection device of claim 1, wherein: the vapor phase side pressure detection transmitter and the liquid phase side pressure detection transmitter are high-precision direct-mounted absolute pressure transmitters.
3. The steam turbine water catcher liquid level detection device of claim 1, wherein: the liquid phase side pressure detection transmitter is a high temperature resistant high precision direct-mounted absolute pressure transmitter.
4. The steam turbine water catcher liquid level detection device of claim 1, wherein: the vapor-phase side temperature detection element and the liquid-phase side temperature detection element are armored platinum thermal resistance thermometers.
5. The steam turbine water catcher liquid level detection device of claim 1, wherein: the signal acquisition and calculation unit comprises a power distribution isolator, a temperature transmitter and a PLC system.
6. The steam turbine water catcher liquid level detection device according to claim 5, wherein: the PLC system is replaced by a DCS system.
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| CN201921101917.5U CN210400532U (en) | 2019-07-15 | 2019-07-15 | Liquid level detection device for steam turbine water recovery device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023273250A1 (en) * | 2021-06-30 | 2023-01-05 | 中国核电工程有限公司 | Heat exchange water tank liquid level measurement system and method, and nuclear power plant pcs |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023273250A1 (en) * | 2021-06-30 | 2023-01-05 | 中国核电工程有限公司 | Heat exchange water tank liquid level measurement system and method, and nuclear power plant pcs |
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