CN117108992A - Control method of vacuum deaerator without deaerator head - Google Patents
Control method of vacuum deaerator without deaerator head Download PDFInfo
- Publication number
- CN117108992A CN117108992A CN202311002926.XA CN202311002926A CN117108992A CN 117108992 A CN117108992 A CN 117108992A CN 202311002926 A CN202311002926 A CN 202311002926A CN 117108992 A CN117108992 A CN 117108992A
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- China
- Prior art keywords
- deaerator
- water
- liquid level
- condensate
- vacuum
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Links
- 238000000034 method Methods 0.000 title claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 99
- 239000007788 liquid Substances 0.000 claims abstract description 54
- 239000003595 mist Substances 0.000 claims abstract description 12
- 238000000926 separation method Methods 0.000 claims abstract description 8
- 230000001105 regulatory effect Effects 0.000 claims description 29
- 230000001502 supplementing effect Effects 0.000 claims description 16
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 claims description 3
- 239000002918 waste heat Substances 0.000 description 3
- 238000000605 extraction Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000008236 heating water Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Degasification And Air Bubble Elimination (AREA)
- Physical Water Treatments (AREA)
Abstract
The invention discloses a control method of a vacuum deaerator without a deaerator head, which comprises the following steps: step one, constructing a deaerator, step two, starting the deaerator, wherein the deaerator comprises the following working processes: starting a condensate pump, enabling condensate of a condenser of the generator set to enter a condensate butterfly nozzle through a condensate pipeline, atomizing the fed condensate into water mist by the condensate butterfly nozzle, enabling the water mist to enter the deaerator body, deoxidizing through a gas-side gas-water separation space, and enabling the water mist to fall into a water-side space at the lower part in the deaerator body, and simultaneously starting a water supply pump to pump out liquid in the deaerator from a water outlet, so that the liquid level in the deaerator is kept at a set liquid level; the method improves the service life of the deaerator.
Description
Technical Field
The invention relates to a water supply deoxidizing system for waste heat power generation, in particular to a control method of a deoxidizing head-free vacuum deoxidizer.
Background
In the field of waste heat power generation, in order to fully utilize waste heat resources, a mode of deoxidizing the water supply by a vacuum deaerator is often adopted, so that the purposes of reducing oxygen corrosion and low-temperature water supply are achieved, and the exhaust gas temperature of a boiler outlet is reduced to the maximum extent.
The present vacuum deaerator is in the form of a deaeration head, for example, chinese patent application No. 2017105907165 discloses a regenerative vacuum deaerator, which comprises a deaeration head connected with a water inlet pipe and a water tank connected to the bottom of the deaeration head and provided with a deaeration water outlet, wherein a steam outlet on the upper part of the deaeration head is connected with a vacuum pump through an exhaust pipe, and the vacuum deaerator also comprises a heat exchange device arranged in the water tank or at the water inlet pipe and used for heating water in the water tank or water at the water inlet pipe, and an outlet of the vacuum pump is connected with an inlet of the heat exchange device through a pipeline.
The deoxidizing head is welded above the deoxidizing water tank in the existing structure, so that the height is higher, and the required overhauling and lifting space is larger. The deaeration head is arranged above the water tank, so that the water tank barrel generates larger concentrated load, the barrel stress is greatly increased, and stress cracks are easily generated in operation, thereby reducing the service life of the deaerator.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a control method of a deaerator without a deaerator head, which can prolong the service life of the deaerator.
In order to achieve the above purpose, the invention is realized by the following technical scheme:
the invention discloses a control method of a vacuum deaerator without a deaerator head, which comprises the following steps:
the method comprises the steps of firstly, constructing a deaerator, wherein the deaerator comprises a deaerator body arranged along the horizontal direction, the left side and the right side of the deaerator body are respectively supported on a support, the supports are fixed on the ground, the deaerator body comprises a circular cylinder, and oval sealing heads are respectively blocked and fixed at two ends of the circular cylinder;
the top of the left end and the right end of the circular cylinder are respectively provided with a vacuumizing interface and a condensed water butterfly nozzle, the vacuumizing interfaces are communicated with the vacuumizing inlet of the integrated liquid ring vacuumizing device through a connecting pipeline provided with a vacuumizing regulating valve, the integrated liquid ring vacuumizing device is supported on the ground, the inlet of the condensed water butterfly nozzle is communicated with a water source through a condensed water pipeline provided with a condensed water pump, the left bottom wall of the circular cylinder is provided with a water outlet, the water outlet is communicated with an inlet pipeline provided with a water supply pump, the elliptical heads on the two sides are respectively provided with a manhole door, the circular cylinder is provided with a remote water level gauge and a pressure transmitter and is provided with a water supplementing port, the remote water level gauge and the pressure transmitter are respectively connected with a DCS through a control cable, the control signal output interface of the DCS is connected with the water supplementing regulating valve and the air supplementing regulating valve through the control cable, the lower part of the deaerator body is a space above the water level of the deaerator body is a space on the air side of the air-water level in the deaerator body;
step two, starting a deaerator, wherein the deaerator comprises the following working processes:
starting a condensate pump, enabling condensate of a condenser of the generator set to enter a condensate butterfly nozzle through a condensate pipeline, atomizing the fed condensate into water mist by the condensate butterfly nozzle, enabling the water mist to enter the deaerator body, deoxidizing through a gas-side gas-water separation space, and enabling the water mist to fall into a water-side space at the lower part in the deaerator body, and simultaneously starting a water supply pump to pump out liquid in the deaerator from a water outlet, so that the liquid level in the deaerator is kept at a set liquid level; the following steps are simultaneously performed in this process: starting the integrated liquid ring vacuumizing device to maintain a rated vacuum value in the deaerator, and deoxidizing by utilizing the principle that the solubility of oxygen in the condensate water is reduced under the vacuum saturation state; the remote transmission liquid level meter outputs the read real-time liquid level signal to the DCS, the DCS compares the real-time liquid level signal with a set liquid level value, if the real-time liquid level signal is lower than the set liquid level value, the DCS outputs the signal to the water supplementing electric regulating valve, and the liquid level in the deaerator body is controlled to be at the set liquid level by regulating the opening degree of the water supplementing electric regulating valve; if the pressure value is not lower than the set liquid level, closing the water supplementing regulating valve, comparing the vacuum pressure value in the deaerator output by the pressure transmitter with the set vacuum value by the DCS, outputting a signal to the air extracting regulating valve by the DCS, and controlling the vacuum working pressure in the deaerator body to be maintained at the set vacuum value by regulating the valve opening of the air extracting regulating valve so as to realize vacuum deaeration.
The beneficial effects of the invention are as follows:
1. the conventional deoxidizing head is canceled, the deoxidizing nozzle is arranged in the air side space inside the water tank, deoxidization is independently completed by the deoxidizing water tank, and the service life of the deoxidizer is prolonged.
2. The deaerator condensate nozzle is stainless steel and adopts a butterfly nozzle.
3. At least one manhole is arranged on each of the two sealing heads of the deaerator so as to be convenient for overhauling and use.
4. The two sides of the top of the deaerator are provided with platforms for operation maintenance and overhaul.
Drawings
FIG. 1 is a front view of a vacuum deaerator without deaerator head of the present invention;
FIG. 2 is a top view of the structure shown in FIG. 1;
fig. 3 is a left side view of the structure shown in fig. 1.
Detailed Description
The invention is further illustrated below with reference to specific embodiments.
As shown in the attached drawing, the control method of the vacuum deaerator without deaerator head comprises the following steps:
step one, the structure deaerator, deaerator include deaerator body 1 that sets up along the horizontal direction, deaerator body 1 left and right sides support respectively on the support, the support fix subaerial, deaerator body 1 include the cylinder the both ends of cylinder shutoff respectively be fixed with oval head 2.
The top of the left end and the right end of the circular cylinder are respectively provided with a vacuumizing interface 4 and a condensed water butterfly nozzle 3, the vacuumizing interfaces 4 are communicated with the vacuumizing inlet of the integrated liquid ring vacuumizing device 6 through a connecting pipeline provided with a vacuumizing adjusting valve 9, and the integrated liquid ring vacuumizing device is supported on the ground. The inlet of the condensed water butterfly nozzle is communicated with a water source through a condensed water pipeline provided with a condensed water pump, a water outlet 8 is formed in the bottom wall of the left side of the circular cylinder, the water outlet 8 is communicated with an inlet pipeline provided with a water supply pump, and manhole doors 5 are respectively arranged on the elliptical sealing heads 2 on the two sides. The remote liquid level meter and the pressure transmitter are respectively connected with the DCS through a control cable, the remote liquid level meter outputs a liquid level signal to the DCS, the pressure transmitter outputs a pressure signal to the DCS, and a control signal output interface of the DCS is connected with the water supplementing power regulating valve and the air exhaust regulating valve through the control cable; water can enter the circular cylinder through the condensed water butterfly nozzle, water is stored in the lower part of the deaerator body, and the space above the liquid level in the deaerator body 1 is a gas-side gas-water separation space.
Preferably, the top of the circular cylinder is provided with an overhaul platform 7, the bottom wall of the overhaul platform is fixed on the top wall of the circular cylinder, and the overhaul platform is supported by the shell structure of the deaerator body 1. The side of the maintenance platform is provided with an upper platform stair, the bottom of the upper platform stair is fixedly connected with the top wall of the circular cylinder, and the inclination angle of the stair is 45 degrees. Q345R is adopted as the material of the body and the sealing head.
Step two, starting a deaerator, wherein the deaerator comprises the following working processes:
starting a condensate pump, enabling condensate of a condenser of the generator set to enter a condensate butterfly nozzle through a condensate pipeline, atomizing the fed condensate into water mist by the condensate butterfly nozzle, enabling the water mist to enter the deaerator body 1, deoxidizing through a gas-side gas-water separation space, and enabling the water mist to fall into a water side space at the lower part in the deaerator body 1, and simultaneously starting a water supply pump to pump out liquid in the deaerator from a water outlet 8, so that the liquid level in the deaerator is kept at a set liquid level; the following steps are simultaneously performed in this process: the integrated liquid ring vacuumizing device 6 is started to maintain a rated vacuum value in the deaerator, and the oxygen removal purpose is achieved by utilizing the principle that the solubility of oxygen in the condensate water is reduced under the vacuum saturation state of the condensate water; the remote transmission liquid level meter outputs the read real-time liquid level signal to the DCS, the DCS compares the real-time liquid level signal with a set liquid level value, if the real-time liquid level signal is lower than the set liquid level value, the DCS outputs the signal to the water supplementing electric regulating valve, and the liquid level in the deaerator body is controlled to be at the set liquid level by regulating the opening degree of the water supplementing electric regulating valve; if the water level is not lower than the set liquid level, the water supplementing regulating valve is closed. After comparing the vacuum pressure value in the deaerator output by the pressure transmitter with the set vacuum value, the DCS outputs a signal to the air extraction regulating valve 9, and the vacuum working pressure in the deaerator body is controlled to be maintained at the set vacuum value by regulating the valve opening of the air extraction regulating valve 9, so that the aim of vacuum deaeration is fulfilled.
The working pressure in the deaerator body can be between 0.005 and 0.1MPa, the specific pressure is selected according to the exhaust backpressure of the turbine unit, and the specific value is consistent with the backpressure.
The liquid level at the lower part in the deaerator body is kept to be 70% of the total volume of the deaerator body 1, the gas-side gas-water separation space is 30% of the total volume of the deaerator body 1, and the gas-water separation effect is fully ensured.
The above description is of the preferred embodiments of the present invention, but the present invention is not limited to the above-described embodiments, and it is obvious to those skilled in the art that several variations and modifications can be made without departing from the scope of the present invention.
Claims (3)
1. The control method of the vacuum deaerator without the deaerator head is characterized by comprising the following steps of:
the method comprises the steps of firstly, constructing a deaerator, wherein the deaerator comprises a deaerator body arranged along the horizontal direction, the left side and the right side of the deaerator body are respectively supported on a support, the supports are fixed on the ground, the deaerator body comprises a circular cylinder, and oval sealing heads are respectively blocked and fixed at two ends of the circular cylinder;
the top of the left end and the right end of the circular cylinder are respectively provided with a vacuumizing interface and a condensed water butterfly nozzle, the vacuumizing interfaces are communicated with the vacuumizing inlet of the integrated liquid ring vacuumizing device through a connecting pipeline provided with a vacuumizing regulating valve, the integrated liquid ring vacuumizing device is supported on the ground, the inlet of the condensed water butterfly nozzle is communicated with a water source through a condensed water pipeline provided with a condensed water pump, the left bottom wall of the circular cylinder is provided with a water outlet, the water outlet is communicated with an inlet pipeline provided with a water supply pump, the elliptical heads on the two sides are respectively provided with a manhole door, the circular cylinder is provided with a remote water level gauge and a pressure transmitter and is provided with a water supplementing port, the remote water level gauge and the pressure transmitter are respectively connected with a DCS through a control cable, the control signal output interface of the DCS is connected with the water supplementing regulating valve and the air supplementing regulating valve through the control cable, the lower part of the deaerator body is a space above the water level of the deaerator body is a space on the air side of the air-water level in the deaerator body;
step two, starting a deaerator, wherein the deaerator comprises the following working processes:
starting a condensate pump, enabling condensate of a condenser of the generator set to enter a condensate butterfly nozzle through a condensate pipeline, atomizing the fed condensate into water mist by the condensate butterfly nozzle, enabling the water mist to enter the deaerator body, deoxidizing through a gas-side gas-water separation space, and enabling the water mist to fall into a water-side space at the lower part in the deaerator body, and simultaneously starting a water supply pump to pump out liquid in the deaerator from a water outlet, so that the liquid level in the deaerator is kept at a set liquid level; the following steps are simultaneously performed in this process: starting the integrated liquid ring vacuumizing device to maintain a rated vacuum value in the deaerator, and deoxidizing by utilizing the principle that the solubility of oxygen in the condensate water is reduced under the vacuum saturation state; the remote transmission liquid level meter outputs the read real-time liquid level signal to the DCS, the DCS compares the real-time liquid level signal with a set liquid level value, if the real-time liquid level signal is lower than the set liquid level value, the DCS outputs the signal to the water supplementing electric regulating valve, and the liquid level in the deaerator body is controlled to be at the set liquid level by regulating the opening degree of the water supplementing electric regulating valve; if the pressure value is not lower than the set liquid level, closing the water supplementing regulating valve, comparing the vacuum pressure value in the deaerator output by the pressure transmitter with the set vacuum value by the DCS, outputting a signal to the air extracting regulating valve by the DCS, and controlling the vacuum working pressure in the deaerator body to be maintained at the set vacuum value by regulating the valve opening of the air extracting regulating valve so as to realize vacuum deaeration.
2. The method for controlling the deaerator without deaerator head, according to claim 1, characterized in that: the liquid level at the lower part in the deaerator body is kept to be 70% of the total volume of the deaerator body, and the gas-side gas-water separation space is 30% of the total volume of the deaerator body.
3. The deaerator control method for the deaerator without deaerator head according to claim 1 or 2, characterized in that: the working pressure in the deaerator body is between 0.005 and 0.1 MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311002926.XA CN117108992A (en) | 2023-08-10 | 2023-08-10 | Control method of vacuum deaerator without deaerator head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311002926.XA CN117108992A (en) | 2023-08-10 | 2023-08-10 | Control method of vacuum deaerator without deaerator head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117108992A true CN117108992A (en) | 2023-11-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311002926.XA Pending CN117108992A (en) | 2023-08-10 | 2023-08-10 | Control method of vacuum deaerator without deaerator head |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117108992A (en) |
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2023
- 2023-08-10 CN CN202311002926.XA patent/CN117108992A/en active Pending
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