CN220302195U - System for adjusting and optimizing steam supply temperature of low-pressure shaft seal of thermal power plant - Google Patents
System for adjusting and optimizing steam supply temperature of low-pressure shaft seal of thermal power plant Download PDFInfo
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- CN220302195U CN220302195U CN202322331864.9U CN202322331864U CN220302195U CN 220302195 U CN220302195 U CN 220302195U CN 202322331864 U CN202322331864 U CN 202322331864U CN 220302195 U CN220302195 U CN 220302195U
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 89
- 230000005494 condensation Effects 0.000 claims abstract description 16
- 238000009833 condensation Methods 0.000 claims abstract description 16
- 239000012535 impurity Substances 0.000 claims description 13
- 238000001816 cooling Methods 0.000 claims description 7
- 238000005457 optimization Methods 0.000 abstract description 3
- 230000003068 static effect Effects 0.000 abstract description 3
- 230000009466 transformation Effects 0.000 description 4
- 230000002209 hydrophobic effect Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
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Abstract
The utility model relates to a low-pressure shaft seal steam supply temperature adjustment and optimization system of a thermal power plant. At present, low-pressure shaft seal temperature reducing water is directly sprayed into condensed water, the pressure of the condensed water is frequently changed along with the load, the vibration of a unit is increased, and even a serious accident of dynamic and static friction is caused. A low-pressure shaft seal steam supply temperature adjustment optimizing system of a thermal power plant comprises the following components: the high-pressure cylinder, the medium-pressure cylinder (11) and the low-pressure cylinder (12) are connected through a shaft seal steam supply pipeline (8), a steam cooler (9) is installed on the low-pressure shaft seal steam supply pipeline, the steam cooler is connected with a steam cooler steam side drainage pipeline (7) and a condensation pipeline (15), and a rear manual door (3) of a steam cooler water side adjusting door, a steam cooler water side adjusting door (4) and a front manual door (5) of the steam cooler water side adjusting door are installed on the condensation pipeline; the condensed water pipeline is provided with a water side adjusting door bypass door (6) of the steam cooler. The product is used for a low-pressure shaft seal.
Description
Technical Field
The utility model relates to a low-pressure shaft seal steam supply temperature adjustment and optimization system of a thermal power plant.
Background
At present, the domestic thermal power plant is provided with a shaft seal system, and the shaft seal mainly prevents steam in the cylinder from leaking out and simultaneously prevents external air from leaking into the low-pressure cylinder by the shaft seal of the low-pressure cylinder to influence vacuum. Therefore, the shaft seal system of the unit operates normally, and is a necessary condition for ensuring the safe operation of the unit. At present, when the unit is started, the shaft seal system of the domestic thermal power plant unit is supplied by an auxiliary steam header, a reheat cold section is used as a standby steam source, and when the unit normally operates, the low-pressure shaft seal self-sealing is realized by steam leakage of a high-pressure cylinder and a medium-pressure cylinder. However, no matter what steam supply mode is adopted, the steam supply temperature of the low-pressure shaft seal is ensured to be within the range of 121-177 ℃, and too high and too low temperature can cause the overlarge deviation between the rotor temperature of the shaft seal section of the low-pressure cylinder and the steam supply temperature of the low-pressure shaft seal (generally not more than 110 ℃) to generate dynamic and static friction of the shaft seal section (small dynamic and static gaps of the shaft seal section), so that the vibration of the unit is increased and the safe operation of the unit is influenced when the vibration is serious. Too low pressure shaft seal temperature reducing water is sprayed into the low pressure shaft seal too much to cause the low pressure shaft seal to carry water, and the low pressure shaft seal is blocked from supplying steam when serious, so that vacuum is reduced, and even water impact phenomenon occurs.
The low-pressure shaft seal de-warming water of the thermal power generating unit is taken from a condensation water main pipe at the outlet of a condensation pump. The temperature of the condensation water at the outlet of the condensation pump is about 50 ℃, the steam supply temperature of the shaft seal is about 250 ℃, water obtained at 50 ℃ is sprayed into steam at 250 ℃ to cool, and because the operation of the condensation water pressure is a variable, the temperature can be lowered to below 121 ℃ when the valve is slightly opened, sometimes even the shaft seal is brought with water, and the steam supply pipeline is prevented from causing vacuum drop; too small of a door-adjusting mechanism can enable the shaft seal temperature to exceed 177 ℃, sometimes even the vibration of the unit is increased, and the safe operation of the unit is seriously threatened. Most thermal power plants reform and upgrade the low-pressure shaft seal temperature-reducing water nozzle and the valve, but the effect is poor.
Disclosure of Invention
The utility model aims to provide a low-pressure shaft seal steam supply temperature adjustment and optimization system of a thermal power plant.
The above object is achieved by the following technical scheme:
a low-pressure shaft seal steam supply temperature adjustment optimizing system of a thermal power plant comprises the following components: the deaerator, the high-pressure cylinder, the medium-pressure cylinder and the low-pressure cylinder are connected through a shaft seal steam supply pipeline, a steam cooler is arranged on the low-pressure shaft seal steam supply pipeline, the steam cooler is respectively connected with a steam side drainage pipeline and a condensation pipeline of the steam cooler, the condensation pipeline is connected with a branch pipe pipeline for impurity of condensation water, and the branch pipe pipeline for impurity of condensation water and the condensation pipeline are respectively connected with a condensation water-to-steam cooling pipeline;
the water condensation pipeline is respectively provided with a rear manual door of the water side adjusting door of the steam cooler, the water side adjusting door of the steam cooler and a front manual door of the water side adjusting door of the steam cooler;
the front manual door of the water side adjusting door of the steam cooler and the rear manual door of the water side adjusting door of the steam cooler are provided with bypass doors of the water side adjusting door of the steam cooler;
the steam side drain valve of the steam cooler is arranged on the steam side drain pipeline of the steam cooler.
The low-pressure shaft seal steam supply temperature adjustment optimizing system of the thermal power plant is characterized in that the steam cooler is connected with the deaerator through a deaerator pipeline from a water side outlet of the steam cooler.
The low-pressure shaft seal steam supply temperature adjustment optimizing system of the thermal power plant is characterized in that a condensed water-steam cooler pipeline is connected with a condensed water impurity pipeline, and the condensed water impurity pipeline is connected with a condensed water pump outlet pipeline.
The utility model has the beneficial effects that:
1. the utility model adopts the steam cooling device, can accurately reduce the temperature of the shaft seal, prevents the temperature-reduced water from being directly sprayed into the steam system, can prevent the shaft seal from carrying water, and can use the redundant temperature of the shaft seal to heat the condensed water, thereby ensuring the safe operation of the unit while not causing heat loss.
2. According to the utility model, through the transformation, the temperature of the low-pressure shaft seal is reduced to the used temperature through indirect heat exchange, so that the direct injection of the temperature-reduced water into the system is avoided, the danger of carrying water by the low-pressure shaft seal of the unit is greatly improved, meanwhile, the indirect heat exchange is carried out, the change range of the steam supply temperature of the shaft seal is smaller, and the adjustment precision is greatly improved.
3. Through the transformation, the redundant temperature of the low-pressure shaft seal is used for heating the condensate, and the heated condensate is directly injected into the deaerator, so that the economy is hardly affected. The transformation project greatly improves the safe operation of the host machine, and solves the difficult problem that the low-pressure shaft seal temperature of all power plants is difficult to adjust.
4. The utility model installs a steam cooler at the low pressure shaft seal pipeline of the machine set, removes the nozzle to reduce the temperature, introduces the condensed water at the water side of the steam cooler, installs a manual door behind the water side adjusting door of the steam cooler, a manual door in front of the water side adjusting door of the steam cooler and the water side adjusting door of the steam cooler on the condensed water pipeline, the backwater after the condensed water is heated is sent to the deaerator, and the steam cooler adds a path of steam to measure the drain water to the condenser. The steam cooling device can be obtained by calculating the maximum load low-pressure shaft seal steam supply and the maximum steam source temperature of the shaft seal by a design institute, tracking the low-pressure shaft seal temperature by an added regulating door, changing the opening degree to ensure the shaft seal steam supply temperature, thus not only accurately controlling the low-pressure shaft seal temperature, but also greatly reducing the possibility of carrying water on the shaft seal.
5. According to the utility model, if the fault of the adjusting door needs to be overhauled, the front and rear manual doors of the adjusting door can be closed, and the size of the condensed water is manually adjusted through the bypass door, so that the steam supply temperature of the low-pressure shaft seal is changed, and the system is flexible and convenient.
Drawings
Fig. 1 is a schematic diagram of the structure of the present utility model.
1. The steam cooler water side outlet to deaerator pipeline, 2, condensate water to steam cooler water side pipeline, 3, steam cooler water side adjustment door back manual door, 4, steam cooler water side adjustment door, 5, steam cooler water side adjustment door front manual door, 6, steam cooler water side adjustment door bypass door, 7, steam cooler steam side hydrophobic door, 8, shaft seal steam supply pipeline, 9, steam cooler, 10, deaerator, 11, high pressure cylinder, medium pressure cylinder, 12, low pressure cylinder, 13, condensate pump outlet pipeline, 14, steam cooler steam side hydrophobic pipeline, 15, condensate water pipeline, 17, condensate water miscellaneous pipeline, 18, #7 low pressure heater, 19, shaft seal heater.
Detailed Description
Examples
A low-pressure shaft seal steam supply temperature adjustment optimizing system of a thermal power plant comprises the following components: the deaerator 10, the high pressure cylinder, the medium pressure cylinder 11 and the low pressure cylinder 12 are connected through a shaft seal steam supply pipeline 8, wherein the shaft seal steam supply pipeline is a front pipeline of the steam cooler, the low pressure shaft seal steam supply pipeline is provided with a steam cooler 9,
the steam cooler is respectively connected with a steam side drainage pipeline 14 and a condensed water pipeline 15 of the steam cooler, the condensed water pipeline is connected with a condensed water impurity branch pipe pipeline, and the condensed water impurity branch pipe pipeline and the condensed water pipeline are respectively connected with a condensed water-to-steam cooling pipeline 2;
the water condensation pipeline is respectively provided with a steam cooler water side adjusting door back manual door 3, a steam cooler water side adjusting door 4 and a steam cooler water side adjusting door front manual door 5 which are connected, and the steam cooler water side adjusting door front and back manual door is provided with a steam cooler water side adjusting door bypass door 6;
the steam cooler steam side drain valve 7 is arranged on the steam cooler steam side drain pipeline.
The low-pressure shaft seal steam supply temperature adjustment optimizing system of the thermal power plant is characterized in that the steam cooler is connected with the deaerator through a deaerator pipeline 1 from a water side outlet of the steam cooler.
The low-pressure shaft seal steam supply temperature adjustment optimizing system of the thermal power plant is characterized in that a condensed water-to-steam cooler pipeline is connected with a condensed water impurity pipeline 17, and the condensed water impurity pipeline is connected with a condensed water outlet pipeline 13.
Examples
A low-pressure shaft seal steam supply temperature adjustment optimizing system of a thermal power plant is characterized in that a steam cooler is added to a desuperheater part of an original low-pressure shaft seal steam supply pipeline, steam is measured as shaft seal steam by the steam cooler, condensate water is taken out from a condensate water impurity pipeline, a front manual door passes through a water side adjustment door of the steam cooler, a rear manual door (a bypass door normally operates in a closed state) of the water side adjustment door of the steam cooler, and the steam enters a deaerator after entering the steam cooler to cool the shaft seal temperature to be about 150 ℃.
The added regulating door automatically tracks the low-pressure shaft seal temperature, the shaft seal temperature is controlled to be about 150 ℃, the temperature change amplitude of the shaft seal is greatly reduced because the temperature reduction (direct cooling) of the nozzle is changed into the temperature reduction (indirect cooling) of the cooler, the control precision of the shaft seal temperature is greatly improved, the water repellency can be generated only when the shaft seal temperature is reduced to be lower than 100 ℃, the safety of a unit is greatly improved, if the shaft seal temperature is lower than 100 ℃ in operation, the steam cooler can be started to measure the water repellency, and the normal condition is in a closed state.
Through the transformation, the problem of water carrying of the low-pressure shaft seal is basically avoided, the safety of the unit is greatly improved, the shaft seal is heated uniformly, and unsafe phenomena such as vibration and friction of a main machine can be basically avoided.
Claims (3)
1. A low-pressure shaft seal steam supply temperature adjustment optimizing system of a thermal power plant comprises the following components: deaerator, high-pressure cylinder, middling pressure jar and low pressure jar between supply vapour pipeline connection, characterized by through the bearing seal: the low-pressure shaft seal steam supply pipeline is provided with a steam cooler, the steam cooler is respectively connected with a steam side drain pipeline and a condensate pipeline of the steam cooler, the condensate pipeline is connected with a branch pipeline for the condensate impurity, and the branch pipeline for the condensate impurity and the condensate pipeline are respectively connected with a condensate-to-steam cooling pipeline;
the water condensation pipeline is respectively provided with a rear manual door of the water side adjusting door of the steam cooler, the water side adjusting door of the steam cooler and a front manual door of the water side adjusting door of the steam cooler;
the front manual door of the water side adjusting door of the steam cooler and the rear manual door of the water side adjusting door of the steam cooler are provided with bypass doors of the water side adjusting door of the steam cooler;
the steam side drain valve of the steam cooler is arranged on the steam side drain pipeline of the steam cooler.
2. The low-pressure shaft seal steam supply temperature adjustment optimizing system of a thermal power plant according to claim 1, characterized in that: the steam cooler is connected with the deaerator through a pipeline from a water side outlet of the steam cooler to the deaerator.
3. The low-pressure shaft seal steam supply temperature adjustment optimizing system of a thermal power plant according to claim 1, characterized in that: the condensed water to steam cooler pipeline is connected with a condensed water impurity pipeline, and the condensed water impurity pipeline is connected with a condensed water pump outlet pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322331864.9U CN220302195U (en) | 2023-08-29 | 2023-08-29 | System for adjusting and optimizing steam supply temperature of low-pressure shaft seal of thermal power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322331864.9U CN220302195U (en) | 2023-08-29 | 2023-08-29 | System for adjusting and optimizing steam supply temperature of low-pressure shaft seal of thermal power plant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220302195U true CN220302195U (en) | 2024-01-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322331864.9U Active CN220302195U (en) | 2023-08-29 | 2023-08-29 | System for adjusting and optimizing steam supply temperature of low-pressure shaft seal of thermal power plant |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220302195U (en) |
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2023
- 2023-08-29 CN CN202322331864.9U patent/CN220302195U/en active Active
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