CN218763329U - Drainage system of subcritical ultrahigh-temperature gas power generation shaft seal heater - Google Patents
Drainage system of subcritical ultrahigh-temperature gas power generation shaft seal heater Download PDFInfo
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- CN218763329U CN218763329U CN202222622691.1U CN202222622691U CN218763329U CN 218763329 U CN218763329 U CN 218763329U CN 202222622691 U CN202222622691 U CN 202222622691U CN 218763329 U CN218763329 U CN 218763329U
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Abstract
The utility model discloses a subcritical ultra-high temperature gas power generation shaft seal heater drainage system, which comprises a shaft seal heater, a drainage tank and a condenser, wherein the drainage tank is connected between the shaft seal heater and the condenser, and is arranged below the shaft seal heater; a liquid level meter is arranged in the drain tank, an air release valve is arranged at the top of the drain tank, an electric regulating valve group is arranged on a pipeline between the drain tank and the condenser, and the electric regulating valve group is interlocked with the liquid level meter; the water drainage tank is connected with a water injection pipeline, and the water injection pipeline is provided with a water injection valve. The system of the utility model has strong self-adjusting capability, and the water level of the shaft seal heater is stable in the starting and variable load processes of the unit; and system reliability and economy are improved.
Description
Technical Field
The utility model belongs to a bearing seal heater drainage technical field, concretely relates to subcritical ultra-high temperature coal gas electricity generation bearing seal heater drainage system.
Background
The ultra-high temperature subcritical gas boiler and the ultra-high temperature subcritical primary intermediate reheat steam-condensing type steam turbine generator unit are adopted for construction of a gas power generation project, so that the heat efficiency of a power plant is greatly improved, and the enterprise benefit is improved. The shaft seal heater is important equipment in a steam turbine shaft seal system and is used for sucking steam escaping from a steam turbine shaft seal so as to avoid discharging the steam into a steam turbine room or entering the system, and meanwhile, the waste heat of the steam is recycled, so that the economic operation of a steam turbine unit is improved. The shaft seal heater is in a micro-negative pressure state when in operation, and the pressure is approximately maintained at 0.095MPa.a; when the condenser TMCR is operated under the working condition, the pressure is 4.9kPa.a, and the operating pressure difference between the condenser TMCR and the condenser TMCR is about 10m water column height. In order to maintain the shaft dewatering water level and prevent steam from entering a condenser or a next-stage heater, a multi-stage water seal (5-stage water seal and 2m height of a water seal cylinder at each stage) is mostly adopted in the conventional shaft dewatering system, as shown in fig. 1; the multi-stage water seal enables water to flow in a zigzag mode in the water seal to form a certain pressure difference (10 m water column resistance), and the special structure of the multi-stage water seal is used in parallel to allow only hydrophobic water to pass through and prevent steam from passing through, so that the effect of shaft plus hydrophobic water is achieved.
The coal gas power generation project is beneficial to generating power by abundant coal gas in a steel mill, and the coal gas always fluctuates to cause unstable unit load. When the shaft seal heater is put into operation, the water level of the shaft seal heater is difficult to control in the starting and load changing processes of the unit, so that the shaft seal heater operates without water level or full water level; or when the multistage water seal outlet valve is in fault or is improperly adjusted in the operation process, the drainage of the shaft seal heater is not smooth, and the water level of the shaft seal heater is abnormally increased;
1) Abnormal rise of water level of shaft seal heater caused by unsmooth drainage of multistage water seal
When the water level of the shaft seal heater is high, the negative pressure at the steam side is reduced, and the suction effect is poor, so that the steam leakage amount of shaft seal leakage steam entering the shaft seal heater is reduced, the leakage of the shaft seal leakage steam is increased, and the water inlet of a steam turbine oil system can be caused; the water level of the shaft seal heater rises abnormally and even is full of water, so that shaft seal steam returns, the shaft seal steam cannot be fully utilized, and most of the steam is discharged by the shaft adding fan, so that the economical efficiency of a unit is reduced; meanwhile, a large amount of steam water is discharged by the shaft air blower, so that the power consumption of the shaft air blower is increased, and the motor of the air blower can be burnt in severe cases.
2) Multistage water seal damage influence unit vacuum
When the shaft seal heater operates without water level, the steam side of the shaft seal heater is directly communicated with the condenser, and the steam side of the shaft seal heater is communicated with the atmosphere through the shaft-added fan, so that the vacuum of the unit is rapidly reduced, and the unit is shut down due to improper treatment; a large amount of steam is pumped away by the shaft fan or enters the condenser, latent heat is not fully utilized, the heat transfer effect is seriously deteriorated, the temperature of the tube wall of the shaft seal heater is increased, and the service life of the steel tube is shortened;
3) The general installation environment of multistage water seal is more moist, takes place to corrode easily. If leakage occurs due to corrosion of the multi-stage water seal pipe, sand holes and the like, the vacuum of the condenser can be reduced; or when a vacuum tightness test is carried out, the leakage rate is high, and the economic efficiency of the unit is influenced.
Disclosure of Invention
In order to meet the technical requirements, the utility model provides a subcritical ultra-high temperature gas power generation shaft seal heater drainage system, when solving the shaft seal heater and putting into operation, the unit is in the start-up and become the load in-process, and shaft seal heater water level is difficult to control, leads to the problem that the shaft seal heater does not have water level or full water level operation; or when the multi-stage water seal outlet valve is in fault or is improperly adjusted in the operation process, the drainage of the shaft seal heater is not smooth, and the water level of the shaft seal heater is abnormally increased.
In order to realize the purpose, the utility model adopts the following technical scheme to realize:
a subcritical ultrahigh-temperature gas power generation shaft seal heater drainage system comprises a shaft seal heater, a drainage tank and a condenser, wherein the drainage tank is connected between the shaft seal heater and the condenser and is arranged below the shaft seal heater;
a liquid level meter is arranged in the drain tank, a gas release valve is arranged at the top of the drain tank, an electric regulating valve group is arranged on a pipeline between the drain tank and the condenser, and the electric regulating valve group is interlocked with the liquid level meter;
the drain tank is connected with a water injection pipeline, and a water injection valve is arranged on the water injection pipeline.
Preferably, the electric regulating valve group comprises an electric regulating valve, a first stop valve and a second stop valve which are arranged in front of and behind the electric regulating valve.
Preferably, the electric regulating valve group is also connected with a bypass stop valve in parallel.
Preferably, the liquid level meter is a magnetic turning plate type liquid level meter, and the liquid level meter is connected with the DCS system.
Preferably, the air release valve, the electric regulating valve group and the water injection valve are all vacuum type valves.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) The water level of the shaft seal heater is stable: the utility model discloses a self-interacting ability of system is strong, and the unit is starting and becomes the load in-process, and the bearing seal heater water level can fluctuate at a less within range to can full automatic work, not report to the police on guaranteeing the water level, have the water level down. And the operation is simple and convenient, further adjustment is not needed after one-time adjustment in place, random start and stop can be achieved without operation, and the maintenance and management workload of operators is reduced.
(2) The reliability is obviously improved: because the load of the gas generator set is unstable, if the traditional multistage water seal type is adopted, the drainage of the shaft seal heater is not smooth, and the water level of the shaft seal heater is abnormally increased; the air plug and the water plug generated in the multistage water seal can also cause the shaft seal heater to drain water smoothly and the water level to rise abnormally. Meanwhile, a large amount of steam water is discharged by the shaft fan, so that the power consumption of the shaft fan is increased, and a fan motor can be burnt in serious cases; when the water seal pipe of the multistage water seal loses water, the steam side of the shaft seal heater is directly communicated with the condenser, and the steam side of the shaft seal heater is communicated with the atmosphere through the shaft-added fan, so that the vacuum of the unit is sharply reduced, and the unit is shut down due to improper treatment. The utility model discloses a system can avoid traditional multistage water seal type system easily to appear the unusual condition of water level for the unit operation reliability type obviously improves.
(3) The economic efficiency of the unit is improved: in a traditional multistage water seal system, due to the fact that the water level of a shaft seal heater rises abnormally and even is full of water, shaft seal steam can return and cannot be fully utilized, most of steam is discharged by a shaft fan, and therefore the economical efficiency of a unit is reduced; meanwhile, a large amount of steam water is discharged by the shaft air blower, so that the power consumption of the shaft air blower is increased; the water level of the shaft seal heater is too low, the multistage water seal loses the effect, the shaft seal exhaust steam directly enters the condenser, the vacuum is influenced, and the output of the unit is reduced. The utility model discloses a system can avoid above-mentioned condition, reduces bearing seal fan power consumption, stabilizes the unit vacuum, improves the unit and forces.
Further advantages of the present invention will be described in the following with reference to the detailed description.
Drawings
FIG. 1 is a schematic structural diagram of a drainage system of a conventional gas power generation shaft seal heater.
Fig. 2 is a schematic structural diagram of a shaft seal heater drainage system according to an embodiment of the present invention.
The meaning of the various reference symbols in the drawings:
1-a shaft seal heater, 2-a drain tank, 3-a condenser, 4-a liquid level meter, 5-an air release valve, 6-an electric regulating valve bank, 7-a bypass stop valve and 8-a water injection valve;
601-electric regulating valve, 602-first stop valve, 603-second stop valve.
Detailed Description
The preferred embodiments of the present invention are described in detail below, but the present invention is not limited to the specific embodiments below, and those skilled in the art can modify or change equivalents within the scope of the claims and shall be included in the scope of the present invention.
In the description of the present invention, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be understood broadly, and may be, for example, fixedly connected or detachably connected or integrated; may be a direct connection, an indirect connection, and the like. The specific meaning of the above terms in the present technical solution can be understood by those of ordinary skill in the art according to specific situations. Unless specified to the contrary, use of the terms of orientation such as "upper, lower, bottom, top" and "in" are generally defined with reference to the drawing plane of the corresponding drawing, and "inner and outer" are defined with reference to the outline of the corresponding drawing.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the invention. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and it should be understood that the terms "comprises" and "comprising", and any variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The specific embodiment of the utility model discloses a subcritical ultra-high temperature gas electricity generation bearing seal heater drainage system, as shown in figure 2, this system includes bearing seal heater 1, drain tank 2, condenser 3, and wherein, drain tank 2 is connected between bearing seal heater 1 and condenser 3, and drain tank 2 sets up at 1 platform below 0 meters layer of bearing seal heater.
A liquid level meter 4 is arranged in the drain tank 2, and the liquid level meter 4 is a magnetic turning plate type liquid level meter. Preferably, the liquid level meter 4 is connected with the DCS system, so that data information can be transmitted to the DCS system, and operators can observe the water level conveniently; of course, in situ observation is also possible.
The top of the drain tank 2 is provided with an air release valve 5; the drain tank 2 is provided with a water injection pipeline connected with a condensate pipeline, and two water injection valves 8 are arranged on the water injection pipeline.
When the unit starts, open the bleed valve 5 at hydrophobic tank top, open two water injection valves 8, fill water to hydrophobic tank 2, when bleed valve 5 has water to spill over, close water injection valve 8 and bleed valve 5.
An electric regulating valve group 6 is arranged on a pipeline between the drain tank 2 and the condenser 3, and the electric regulating valve group 6 comprises an electric regulating valve 601, a first stop valve 602 and a second stop valve 603 which are arranged in front of and behind the electric regulating valve 601. The electric regulating valve 601 is interlocked with the liquid level meter 4, when the unit is subjected to load increase, the steam quantity of the shaft seal is increased, the drainage quantity of the shaft seal is increased, the opening degree of the electric regulating valve 601 is increased, and the drainage quantity is increased; on the contrary, when the unit is loaded down, the steam quantity of the shaft seal is reduced, the drainage quantity of the shaft seal is reduced, the opening degree of the electric regulating valve 601 is reduced, and the drainage quantity is reduced. In this embodiment, the normal water level of 1 meter in the drain tank 2 is guaranteed during normal operation.
Preferably, a bypass stop valve 7 is connected in parallel with the electric regulating valve group 6. After the shaft seal heater is put into operation, the electric regulating valve 601, the first stop valve 602 and the second stop valve 603 are opened, and the bypass stop valve 7 is closed; when the electric control valve 601 has an accident, the bypass stop valve is opened to ensure the safe operation of the system.
Preferably, the air release valve 5, the electric regulating valve set 6, the bypass stop valve 7 and the water injection valve 8 of the present embodiment are vacuum type valves.
In order to avoid misoperation, no valve is arranged from the drainage outlet of the shaft seal heater 1 to the inlet of the drainage tank 2.
It can be seen that the system of the embodiment has strong self-regulating capability, the water level of the heater can fluctuate within a small range in the starting and load varying processes of the unit, and the fluctuation range of the embodiment is +/-10 mm; the condition that the water level is easy to be abnormal in the traditional multi-stage water seal type system can be avoided, so that the running reliability of the unit is obviously improved; meanwhile, the power consumption of the shaft seal fan is reduced, the vacuum of the unit is stabilized, the output of the unit is improved, and the economy of the unit is improved.
Claims (5)
1. A subcritical ultra-high temperature gas power generation shaft seal heater drainage system comprises a shaft seal heater (1) and a condenser (3), and is characterized by further comprising a drainage tank (2), wherein the drainage tank (2) is connected between the shaft seal heater (1) and the condenser (3), and the drainage tank (2) is arranged below the shaft seal heater (1);
a liquid level meter (4) is arranged in the drain tank (2), a release valve (5) is arranged at the top of the drain tank (2), an electric regulating valve group (6) is arranged on a pipeline between the drain tank (2) and the condenser (3), and the electric regulating valve group (6) is interlocked with the liquid level meter (4);
the water drainage tank (2) is connected with a water injection pipeline, and the water injection pipeline is provided with a water injection valve (8).
2. The subcritical ultra-high temperature gas power generation shaft seal heater drainage system according to claim 1, wherein the electric regulating valve group (6) comprises an electric regulating valve (601), a first stop valve (602) and a second stop valve (603) which are arranged in front of and behind the electric regulating valve (601).
3. The subcritical superhigh temperature gas power generation shaft seal heater drainage system according to claim 1 or 2, characterized in that a bypass stop valve (7) is further connected in parallel to the electric regulating valve group (6).
4. The subcritical superhigh temperature gas power generation shaft seal heater drainage system according to claim 1, characterized in that the liquid level meter (4) is a magnetic flip type liquid level meter, and the liquid level meter (4) is connected with a DCS system.
5. The subcritical superhigh temperature gas power generation shaft seal heater drainage system according to claim 1, wherein the air release valve (5), the electric regulating valve group (6) and the water injection valve (8) are all vacuum type valves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222622691.1U CN218763329U (en) | 2022-09-30 | 2022-09-30 | Drainage system of subcritical ultrahigh-temperature gas power generation shaft seal heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222622691.1U CN218763329U (en) | 2022-09-30 | 2022-09-30 | Drainage system of subcritical ultrahigh-temperature gas power generation shaft seal heater |
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| Publication Number | Publication Date |
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| CN218763329U true CN218763329U (en) | 2023-03-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222622691.1U Active CN218763329U (en) | 2022-09-30 | 2022-09-30 | Drainage system of subcritical ultrahigh-temperature gas power generation shaft seal heater |
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| CN (1) | CN218763329U (en) |
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- 2022-09-30 CN CN202222622691.1U patent/CN218763329U/en active Active
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