CN217270363U - Cut jar unit and hang down recirculation system - Google Patents
Cut jar unit and hang down recirculation system Download PDFInfo
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- CN217270363U CN217270363U CN202220800324.3U CN202220800324U CN217270363U CN 217270363 U CN217270363 U CN 217270363U CN 202220800324 U CN202220800324 U CN 202220800324U CN 217270363 U CN217270363 U CN 217270363U
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Abstract
The utility model discloses a cut jar unit and hang down province recirculation system, include: the system comprises a middle exhaust steam system, a steam turbine heat recovery system and a low-level-of-economy recycling system, wherein the middle exhaust steam system comprises a middle pressure cylinder and a deaerator; the steam turbine heat recovery system comprises a low-pressure cylinder and a low-pressure heater, wherein the output end of the low-pressure heater is connected with a deaerator, and the input end of the low-pressure heater is provided with a fifth valve and an eighth valve in series; the low-saving recirculation system comprises a low-temperature economizer, a recirculation pump, a sixth valve and a ninth valve, a seventh valve is arranged between the low-temperature economizer and the recirculation pump, and the sixth valve and the seventh valve are arranged in parallel. The utility model provides a cut jar unit and hang down low province recirculation system and utilize flue gas waste heat heating condensate water, improved the unit and cut the condensate temperature that jar operation period got into oxygen-eliminating device and low pressure feed water heater entry, reduced the steam flow of oxygen-eliminating device entry to fundamentally has solved the problem of oxygen-eliminating device entry steam extraction pipeline hypervelocity vibration.
Description
Technical Field
The utility model relates to an electric power energy technical field especially relates to a cut jar unit low province recirculation system.
Background
In recent years, the scale and specific gravity of renewable energy power generation such as wind power and photovoltaic are greatly improved. However, renewable energy has the characteristics of volatility, intermittence and the like, and after the renewable energy is connected to a power grid, the capability of adding auxiliary services such as peak shaving and peak peaking of a conventional thermal power generating unit is needed. Under the dual background that a coal-fired power generating set occupies the main power supply position and simultaneously large-scale unstable renewable energy sources need to be connected to the grid urgently, the load regulation capacity of the thermal power generating set in China needs to be improved urgently.
For a heat supply unit, due to the requirement of civil insurance, how to improve the adjustable capacity of the electric output of the unit on the premise of meeting the heat supply is an urgent problem to be solved. At present, most of straight condensing units or heat supply units are subjected to a technical means of low-pressure cylinder zero output, and the contradiction that the units are thermally coupled and difficult to flexibly operate is relieved to a certain extent. However, under the zero-output state of the low-pressure cylinder, along with the great reduction of the steam inlet amount of the low-pressure cylinder, each stage of low-pressure heater corresponding to the low-pressure cylinder does not work basically, so that the temperature of the inlet condensed water entering the deaerator is lower than a designed value and far deviates from the designed value, the flow of the inlet steam pipeline of the deaerator is increased sharply, and the vibration aggravation and even cracking of the inlet steam pipeline of the deaerator are caused.
SUMMERY OF THE UTILITY MODEL
To the zero state of exerting oneself of the low pressure jar that exists in the above-mentioned technique under, technical problem of oxygen-eliminating device entry steam conduit overspeed vibration, the utility model provides a cut jar unit and hang down province recirculation system. The utility model discloses a cut low province recirculation system of jar unit and utilize the flue gas preheating and heating condensate water, improved the unit and got into the condensate water temperature of oxygen-eliminating device entry cutting jar operation period, reduced the steam flow of oxygen-eliminating device entry, fundamentally has solved the problem of oxygen-eliminating device entry steam exhaust pipeline hypervelocity vibration.
The utility model provides a cut jar unit and hang down province recirculation system, include:
the steam turbine comprises a medium-exhaust steam exhaust system, a steam turbine and a steam turbine, wherein the medium-exhaust steam exhaust system comprises a medium-pressure cylinder and a deaerator, and partial exhaust steam of the medium-pressure cylinder enters the deaerator;
the steam turbine heat recovery system comprises a low-pressure cylinder and a low-pressure heater arranged at the steam exhaust end of the low-pressure cylinder, the output end of the low-pressure heater is connected with the deaerator, the input end of the low-pressure heater is provided with a fifth valve and an eighth valve in series, and the fifth valve is arranged between the eighth valve and the low-pressure heater;
the low-saving recycling system comprises a low-temperature economizer, a recycling pump, a sixth valve and a ninth valve, wherein a seventh valve is arranged between the low-temperature economizer and the recycling pump, and the sixth valve and the seventh valve are arranged in parallel.
In some embodiments, a first valve and a second valve are disposed in parallel between the low pressure cylinder and the intermediate pressure cylinder.
In some embodiments, when the unit is operating with the low pressure cylinder cut off, the exhaust steam of the intermediate pressure cylinder is mainly routed to the heating system via the third valve.
In some embodiments, a fourth valve is disposed between the low pressure cylinder and the low pressure heater.
In some embodiments, when the unit operates without cutting off the low-pressure cylinder, the condensed water enters the low-temperature economizer through the ninth valve to exchange heat and then flows out through the sixth valve.
In some embodiments, when the unit is operated by cutting off the low-pressure cylinder, under the action of the recirculation pump, part of the condensed water flows through the eighth valve, the recirculation pump and the seventh valve in sequence, enters the low-temperature economizer for heat exchange, flows out through the ninth valve and is circulated next time under the action of the recirculation pump.
In some embodiments, the opening of the fifth valve is adjusted to match the amount of condensate recirculation into the low temperature economizer when the stack is operating with low pressure cylinders cut.
In some embodiments, the fourth valve is closed when the battery is operating with the low pressure cylinder cut.
In some embodiments, the flue gas is sent to a dust removal system after heat exchange in the low-temperature economizer.
In some embodiments, water discharged from the deaerator goes to a feed pump.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model provides a cut jar unit and hang down low province recirculation system and utilize flue gas waste heat heating condensate water, improved the unit and cut the condensate temperature that jar operation period got into oxygen-eliminating device and low pressure feed water heater entry, reduced the steam flow of oxygen-eliminating device entry to fundamentally has solved the problem of oxygen-eliminating device entry steam extraction pipeline hypervelocity vibration.
The utility model provides a cut low province recirculation system of jar unit can fully exert the advantage that low temperature economizer absorbs flue gas waste heat energy-conservation and can adjust in a flexible way at full operating mode period, has improved flexibility, security and the economic nature of unit system when the jar operation is cut in the heating phase.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic view of a low-provincial recirculation system of the cylinder cutting unit provided by the utility model.
Description of reference numerals:
the system comprises an intermediate pressure cylinder 1, a low pressure cylinder 2, a deaerator 3, a low pressure heater 4, a recirculating pump 5, a low temperature economizer 6, a first valve 7, a second valve 8, a third valve 9, a fourth valve 10, a fifth valve 11, a sixth valve 12, a seventh valve 13, an eighth valve 14 and a ninth valve 15.
Detailed Description
Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.
The cylinder cutting unit low-provincial recirculation system provided by the embodiment of the invention is described below with reference to the attached drawings.
As shown in fig. 1, the utility model discloses a cut low province recirculation system of jar unit, include: the system comprises a medium exhaust steam system, a steam turbine regenerative system and a low-level-of-economy recirculation system.
In some embodiments, the medium exhaust steam system includes a deaerator 3, an intermediate pressure cylinder 1, a first valve 7, a second valve 8, and a third valve 9. Wherein, the steam exhaust part of the intermediate pressure cylinder 1 enters the deaerator 3 to heat the condensed water in the deaerator 3. It can be understood that the deaerator 3 adaptively extracts exhaust steam of the intermediate pressure cylinder 1, and when the temperature of condensed water entering the deaerator 3 is low, the exhaust amount extracted by the deaerator 3 from the intermediate pressure cylinder 1 is increased, so that the flow of an inlet steam pipeline of the deaerator 3 is increased, and the vibration of the inlet steam pipeline of the deaerator 3 is aggravated; when the temperature of the condensed water entering the deaerator 3 is higher, the deaerator 3 reduces the steam exhaust amount extracted from the intermediate pressure cylinder 1, the flow of the steam pipeline at the inlet of the deaerator 3 is reduced, and the violent vibration of the steam pipeline at the inlet of the deaerator 3 cannot be caused.
In some embodiments, water discharged from the deaerator 3 goes to a feed pump.
When the unit is operated with the low pressure cylinder cut off, the exhaust steam of the intermediate pressure cylinder 1 is mainly sent to the heating system through the third valve 9. At this time, the exhaust steam of the intermediate pressure cylinder 1 is mainly used for heating. It can be understood that the third valve 9 is arranged on the heat supply pipeline, and when the exhaust steam of the intermediate pressure cylinder 1 is required for supplying heat, the third valve 9 is opened; when the exhaust steam of the intermediate pressure cylinder 1 is not required for heating, the third valve 9 is closed.
In some embodiments, the low pressure cylinder 2 and the intermediate pressure cylinder 1 are connected by a pipeline, and the exhaust steam of the intermediate pressure cylinder 1 enters the low pressure cylinder 2 through the pipeline. A first valve 7 and a second valve 8 are arranged on the line, wherein the first valve 7 and the second valve 8 are arranged in parallel.
In some embodiments, the turbine regenerative system includes a low pressure cylinder 2, a low pressure heater 4, a fourth valve 10, a fifth valve 11, and an eighth valve 14.
In some embodiments, the low pressure heater 4 is disposed at a steam exhaust end of the low pressure cylinder 2, and the steam exhaust of the low pressure cylinder 2 provides a heat source for the low pressure heater 4. A fourth valve 10 is arranged between the low-pressure heater 4 and the low-pressure cylinder 2, and the on-off of the steam discharged from the low-pressure cylinder 2 entering the low-pressure heater 4 is controlled through the on-off of the fourth valve 10.
In some embodiments, the output end of the low-pressure heater 4 is connected with the deaerator 3, that is, the deaerator 3 is arranged at the downstream of the low-pressure heater 4, and water flowing out of the low-pressure heater 4 enters the deaerator 3.
In some exemplary embodiments, a fifth valve 11 and an eighth valve 14 are provided at the input of the low-pressure heater 4, and the fifth valve 11 and the eighth valve 14 are arranged in series, wherein the fifth valve 11 is provided between the eighth valve 14 and the low-pressure heater 4. That is, the fifth valve 11 and the eighth valve 14 are provided upstream of the low pressure heater 4, and the condensed water from the upstream flows through the eighth valve 14 and the fifth valve 11 in order to enter the low pressure heater 4.
In some embodiments, the low-economized recirculation system includes a low-temperature economizer 6, a recirculation pump 5, a seventh valve 13, a sixth valve 12, and a ninth valve 15.
In some embodiments, a seventh valve 13 is disposed between the low-temperature economizer 6 and the recirculation pump 5. It will be appreciated that when the recirculation pump 5 is operating, the seventh valve 13 is open; when the recirculation pump 5 is not in operation, the seventh valve 13 is closed.
In some embodiments, the sixth valve 12 and the seventh valve 13 are arranged in parallel. That is, the sixth valve 12 and the seventh valve 13 are provided on different branches, respectively.
In some embodiments, the flue gas is sent to a dust removal system (not shown) after heat exchange in the low-temperature economizer 6.
When the unit does not cut off the low-pressure cylinder, the first valve 7 is opened, and the opening degree of the third valve 9 is adjusted to meet the heat supply requirement to a certain degree or stop heat supply. At this time, the steam inlet amount of the low pressure cylinder 2 is large, the fourth valve 10 is opened, and the discharged steam of the low pressure cylinder 2 enters the low pressure heater 4 through the fourth valve 10 to provide a heat source for the low pressure heater 4, so that the normal operation of the low pressure heater 4 is met. The recirculation pump 5 stops working, the seventh valve 13 is closed, and the fifth valve 11, the sixth valve 12 and the ninth valve 15 are fully opened. Aiming at the flow needing to be led into the low-temperature economizer 6, the opening degree of the eighth valve 14 is adjusted, the resistance flowing through the eighth valve 14 is matched with the resistance flowing through the ninth valve 15, the low-temperature economizer 6 and the sixth valve 12, and the eighth valve 14 can be fully closed under the limit condition, so that part or all of condensed water enters the low-temperature economizer 6 to absorb heat, the temperature of the condensed water entering the low-pressure heater 4 is increased, the corresponding steam extraction of the low-pressure cylinder 2 is reduced, and the work load of the low-pressure cylinder 2 is increased. At this time, the condensed water enters the low-temperature economizer 6 through the ninth valve 15 for heat exchange and then flows out through the sixth valve 12.
When the unit cuts off the low pressure cylinder 2, under the action of the recirculation pump 5, part of the condensed water flows through the eighth valve 14, the recirculation pump 5 and the seventh valve 13 in sequence, enters the low-temperature economizer 6 for heat exchange, flows out through the ninth valve 15 and is circulated next time under the action of the recirculation pump 5.
Specifically, when the unit cuts off the low-pressure cylinder, the first valve 7 is closed, the opening degree of the second valve 8 is adjusted, the third valve 9 is opened, and the low-pressure cylinder 2 is kept to enter a small amount of cooling steam flow. At this time, the exhaust steam of the intermediate pressure cylinder 1 mainly goes to a heating system (not shown in the figure), and a part of the exhaust steam of the intermediate pressure cylinder 1 enters the deaerator 3. Since the steam inlet amount of the low pressure cylinder 2 is very small, the fourth valve 10 is closed, and the low pressure heater 4 is prevented from reversely inputting the wet steam into the low pressure cylinder 2. And closing the sixth valve 12, opening the ninth valve 15, starting the recirculating pump 5, enabling the inlet pressure of the ninth valve 15 to be greater than the outlet condensed water pressure, adjusting the opening degrees of the fifth valve 11 and the seventh valve 13, ensuring that the flow entering the low-pressure heater 4 and the flow coming from the condensed water meet the load requirement of the unit, and adjusting the opening degree of the fifth valve 11 to match the condensed water recirculating amount entering the low-temperature economizer 6. After the condensate water with higher temperature and the condensate water with low temperature after the heat absorption of the low-temperature economizer 6 are mixed, the temperature of the condensate water entering the low-pressure heater 4 and the deaerator 3 can be increased, and meanwhile, the temperature of the condensate water entering the low-temperature economizer 6 is not lower than the temperature of an acid leakage point. It can be understood that under the action of the recirculation pump 5, the condensed water can enter the low-temperature economizer 6 for multiple times to absorb heat until the temperature of the condensed water reaches the requirement.
Because the medium flowing direction of the ninth valve 15 changes in two modes, the specific switching process is as follows: when the mode is switched from the non-cutting low-pressure cylinder mode to the cutting low-pressure cylinder mode, the sixth valve 12 is gradually closed firstly, the condensed water is blocked from directly entering the low-temperature economizer 6, the recirculation pump 5 is started to keep a certain lift, and then the seventh valve 13 is opened, so that the recirculation operation mode of the condensed water can be realized, and vice versa, or parallel valves are added on the loop of the ninth valve 15, and the flow direction is reversed through the switching logics of the parallel valves and the ninth valve 15.
The recycling system based on the low-temperature economizer 6 heats condensed water by using the waste heat of flue gas, improves the temperature of the condensed water entering the deaerator 3 and the inlet of the low-pressure heater 4 when a unit is in cylinder-cutting operation period, and reduces the steam flow at the inlet of the deaerator 3, thereby fundamentally solving the problem of overspeed vibration of a steam extraction pipeline at the inlet of the deaerator 3; meanwhile, the advantages of energy conservation and flexible adjustment of the low-temperature economizer 6 for absorbing the waste heat of the flue gas can be fully exerted in the whole working condition period, and the flexibility, the safety and the economical efficiency of the system when the unit is operated in a cylinder switching mode in the heat supply period are improved.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms may be directed to different embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly defined otherwise.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. The utility model provides a cut jar unit low province recirculation system which characterized in that includes:
the system comprises a medium-exhaust steam exhaust system, a steam-exhaust system, wherein the medium-exhaust steam-exhaust system comprises a medium-pressure cylinder and a deaerator, and a steam-exhaust steam;
the steam turbine heat recovery system comprises a low-pressure cylinder and a low-pressure heater arranged at the steam exhaust end of the low-pressure cylinder, the output end of the low-pressure heater is connected with the deaerator, the input end of the low-pressure heater is provided with a fifth valve and an eighth valve in series, and the fifth valve is arranged between the eighth valve and the low-pressure heater;
the low-saving recycling system comprises a low-temperature economizer, a recycling pump, a sixth valve and a ninth valve, wherein a seventh valve is arranged between the low-temperature economizer and the recycling pump, and the sixth valve and the seventh valve are arranged in parallel.
2. The system of claim 1, wherein a first valve and a second valve are disposed in parallel between the low pressure cylinder and the intermediate pressure cylinder.
3. The system of claim 1, wherein when the stack is operating with the low pressure cylinder removed, the exhaust from the intermediate pressure cylinder is directed primarily to the heating system through the third valve.
4. The system of claim 1, wherein a fourth valve is disposed between the low pressure cylinder and the low pressure heater.
5. The system of claim 1, wherein when the unit is operated without cutting off the low-pressure cylinder, condensed water enters the low-temperature economizer through the ninth valve to exchange heat and then flows out through the sixth valve.
6. The system of claim 1, wherein when the unit is operated by cutting off a low pressure cylinder, under the action of the recirculation pump, part of the condensed water flows through the eighth valve, the recirculation pump and the seventh valve in sequence, enters the low-temperature economizer for heat exchange, flows out through the ninth valve, and is circulated next time under the action of the recirculation pump.
7. The system of claim 1, wherein the opening of the fifth valve is adjusted to match the amount of condensate recirculation into the low-temperature economizer when the stack is operating with low-pressure cylinders removed.
8. The system of claim 4, wherein the fourth valve is closed when the battery is operating with the low pressure cylinder removed.
9. The system of claim 1, wherein flue gas is directed to a dust removal system after heat exchange in the low-temperature economizer.
10. The system of claim 1, wherein water discharged from the deaerator is directed to a feed pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220800324.3U CN217270363U (en) | 2022-04-07 | 2022-04-07 | Cut jar unit and hang down recirculation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220800324.3U CN217270363U (en) | 2022-04-07 | 2022-04-07 | Cut jar unit and hang down recirculation system |
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| Publication Number | Publication Date |
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| CN217270363U true CN217270363U (en) | 2022-08-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220800324.3U Active CN217270363U (en) | 2022-04-07 | 2022-04-07 | Cut jar unit and hang down recirculation system |
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| CN (1) | CN217270363U (en) |
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- 2022-04-07 CN CN202220800324.3U patent/CN217270363U/en active Active
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