CN216308658U - Circulating water system based on low-pressure cylinder zero-output operation mode - Google Patents
Circulating water system based on low-pressure cylinder zero-output operation mode Download PDFInfo
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- CN216308658U CN216308658U CN202122474990.0U CN202122474990U CN216308658U CN 216308658 U CN216308658 U CN 216308658U CN 202122474990 U CN202122474990 U CN 202122474990U CN 216308658 U CN216308658 U CN 216308658U
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Abstract
The utility model provides a circulating water system based on a low-pressure cylinder zero-output operation mode, which comprises: the system comprises cooling towers, circulating water pumps and condensers, wherein each unit is correspondingly provided with one cooling tower, each cooling tower is connected with at least two circulating water pumps through a pipeline, the pipelines at the water outlet of the circulating water pumps are gathered to form a water supply pipeline, the outlet end of the water supply pipeline is connected with one condenser, and the condenser is circularly connected with the cooling towers through a water return pipeline; the common intercommunication has first contact pipe between the water supply pipe of two adjacent cooling towers, sets up two at least circulating water supply contact doors on the first contact pipe, through adjusting circulating water supply contact door, realizes the contact of two units circulating water supply pipe.
Description
Technical Field
The utility model relates to the technical field of industrial devices, in particular to a circulating water system based on a low-pressure cylinder zero-output operation mode.
Background
When the units normally operate, one or two circulating water pumps are operated by each unit to provide cooling water for the unit, but in a heat supply season, especially in a low-pressure cylinder zero-output operation mode, the cooling water flow rate of each unit when operating one circulating water pump is far greater than the cooling water flow rate required by the unit, so that the waste of plant power is caused, the end difference of a condenser is too large, and the safe operation of a cooling tower in winter is not facilitated, so that a circulating water system operation method based on a low-pressure cylinder zero-output operation mode is necessary to be researched, and the system economy is improved.
In order to reduce the energy consumption index and the production and operation cost of the power plant, the energy-saving potential of the equipment system is excavated by optimizing the operation mode of the equipment system. The circulating water system of the power plant is a large consumer, and in a heat supply season, particularly when a low-pressure cylinder of a unit is put into operation with zero output, the mode that one unit operates one circulating water pump causes great waste of service power. Therefore, the operation mode of the circulating water system is optimized, so that the control cost of the power plant and the reduction of the power consumption rate of the power plant are necessary.
The existing scheme for reducing the power consumption rate of the circulating water system in winter has two types:
firstly, a circulating water pump is changed into a double-speed pump, and the pump is switched to low-speed operation in winter, so that the plant power consumption rate is reduced.
Secondly, reform transform the circulating pump into the variable frequency circulating pump, through reducing the circulating pump frequency, reduce the station service power consumption rate.
The first solution has the following disadvantages:
1. the requirement of the normal operation working condition of the unit on the flow rate of circulating water is also met when the circulating water pump operates at a low speed, so that the plant power consumption is still high.
2. When the circulating water pump is switched between a high speed and a low speed, the circulating water pump needs to be stopped, the operation amount is increased, and the safe operation of a power plant unit is not facilitated.
The second solution has the following disadvantages:
1. the circulating water pump is subjected to frequency conversion transformation, the investment is large, and the occupied area of frequency conversion equipment is large.
2. The variable-frequency transformation of the circulating water pump also meets the requirement of the normal operation working condition of the unit on the circulating water flow, and the plant power consumption rate is still higher.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned technical problems, a circulating water system based on a low pressure cylinder operating mode with zero output is provided. When the low-pressure cylinder of the unit operates with zero output, one circulating water pump can provide circulating cooling water for the two units by adjusting the circulating water supply and return pipeline connecting door and the circulating water cooling tower connecting door of the two units. The technical means adopted by the utility model are as follows:
a circulating water system based on a low-pressure cylinder zero-output operation mode comprises: the system comprises cooling towers, circulating water pumps and condensers, wherein each unit is correspondingly provided with one cooling tower, each cooling tower is connected with at least two circulating water pumps through a pipeline, the pipelines at the water outlet of the circulating water pumps are gathered to form a water supply pipeline, the outlet end of the water supply pipeline is connected with one condenser, and the condenser is circularly connected with the cooling towers through a water return pipeline;
the common intercommunication has first contact pipe between the water supply pipe of two adjacent cooling towers, sets up two at least circulating water supply contact doors on the first contact pipe, through adjusting circulating water supply contact door, realizes the contact of two units circulating water supply pipe.
Furthermore, a second connecting pipe is jointly communicated between the return water pipelines of two adjacent cooling towers, the second connecting pipe is provided with at least two circulating water return connecting doors, and the connection of the two sets of circulating water return pipelines is realized by adjusting the circulating water return connecting doors.
Further, the circulating water return connection door adopts an electric valve.
Further, the circulating water supply interconnection door adopts an electric valve.
Further, the condenser is a surface heat exchanger.
Further, when the two units are arranged, the two units are respectively a first unit and a second unit, the first unit and the second unit are respectively provided with a first cooling tower and a second cooling tower correspondingly, the first cooling tower is connected with a first circulating water pump and a second circulating water pump which are arranged in parallel through pipelines, and the second cooling tower is connected with a third circulating water pump and a fourth circulating water pump which are arranged in parallel through pipelines;
pipelines at the water outlets of the first circulating water pump and the second circulating water pump are converged into one pipeline to form a first water supply pipeline, the outlet end of the first water supply pipeline is connected with a first condenser, and the first condenser is circularly connected with a first cooling tower through a first water return pipeline;
pipelines at the water outlets of the third circulating water pump and the fourth circulating water pump are converged into one pipeline to form a second water supply pipeline, the outlet end of the second water supply pipeline is connected with a second condenser, and the second condenser is circularly connected with a second cooling tower through a second water return pipeline;
a first communication pipe is communicated between the first water supply pipeline and the second water supply pipeline, and two circulating water supply communication doors which are arranged in series are arranged on the first communication pipe and respectively serve as a circulating water supply communication door I and a circulating water supply communication door II;
and a second connecting pipe is communicated between the first water return pipeline and the second water return pipeline, and two circulating water return connecting doors which are arranged in series are arranged on the second connecting pipe and are respectively a circulating water return connecting door I and a circulating water return connecting door II.
Furthermore, at least one of the first circulating water pump and the second circulating water pump is opened, and at least one of the third circulating water pump and the fourth circulating water pump is opened; the first circulating water pump and/or the second circulating water pump and the third circulating water pump and/or the fourth circulating water pump can be turned on at the same time, or the third circulating water pump and/or the fourth circulating water pump are turned off/on when the first circulating water pump and/or the second circulating water pump are turned on/off.
Further, when the first circulating water pump and/or the second circulating water pump and the third circulating water pump and/or the fourth circulating water pump are/is opened simultaneously, the first circulating water supply connection door, the second circulating water supply connection door, the first circulating water return connection door and the second circulating water return connection door can be opened simultaneously, or when the first circulating water supply connection door and the second circulating water supply connection door are opened/closed, the first circulating water return connection door and the second circulating water return connection door are closed/opened.
Compared with the prior art, the utility model has the following advantages:
1. according to the circulating water system based on the low-pressure cylinder zero-output operation mode, when the low-pressure cylinder of the unit operates with zero-output, circulating cooling water can be supplied to the two units by one circulating water pump by adjusting the circulating water supply and return pipeline connection door and the circulating water cooling tower connection door of the two units.
2. The circulating water system based on the low-pressure cylinder zero-output operation mode provided by the utility model completely meets the requirements of two condensers on the flow rate and the pressure of cooling water by using a single circulating water pump.
For the above reasons, the present invention can be widely applied to the fields such as industry.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of embodiment 1 of the present invention.
Fig. 2 is a schematic structural diagram of embodiment 2 of the present invention.
In the figure: 1. a first cooling tower; 2. a second cooling tower; 3. a first circulating water pump; 4. a second circulating water pump; 5. a third circulating water pump; 6. a fourth circulating water pump; 7. a first communication door for supplying circulating water; 8. a circulating water supply connection door II; 9. a first condenser; 10. a second condenser; 11. a circulating water return connection door I; 12. a circulating water return connection door II; 13. a first water supply line; 14. a second water supply line; 15. a first water return line; 16. and a second water return pipeline.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in the figure, the utility model provides a circulating water system based on a low-pressure cylinder zero-output operation mode, which comprises: the system comprises cooling towers, circulating water pumps and condensers, wherein each unit is correspondingly provided with one cooling tower, each cooling tower is connected with at least two circulating water pumps through a pipeline, the pipelines at the water outlet of the circulating water pumps are gathered to form a water supply pipeline, the outlet end of the water supply pipeline is connected with one condenser, and the condenser is circularly connected with the cooling towers through a water return pipeline;
the common intercommunication has first contact pipe between the water supply pipe of two adjacent cooling towers, sets up two at least circulating water supply contact doors on the first contact pipe, through adjusting circulating water supply contact door, realizes the contact of two units circulating water supply pipe.
As a preferred embodiment, a second connecting pipe is commonly communicated between the return pipelines of two adjacent cooling towers, the second connecting pipe is provided with at least two circulating water return connecting doors, and the connection of the circulating water return pipelines of the two units is realized by adjusting the circulating water return connecting doors.
In a preferred embodiment, the circulating water return connection door adopts an electric valve.
In a preferred embodiment, the circulating water supply communication door adopts an electric valve.
In a preferred embodiment, the condenser is a surface heat exchanger.
As a preferred embodiment, when two units are provided, the two units are a first unit and a second unit, the first unit and the second unit are respectively provided with a first cooling tower 1 and a second cooling tower 2 correspondingly, the first cooling tower 1 is connected with a first circulating water pump 3 and a second circulating water pump 4 which are arranged in parallel through pipelines, and the second cooling tower 2 is connected with a third circulating water pump 5 and a fourth circulating water pump 6 which are arranged in parallel through pipelines;
pipelines at the water outlets of the first circulating water pump 3 and the second circulating water pump 4 are converged into one pipeline to form a first water supply pipeline 13, the outlet end of the first water supply pipeline 13 is connected with a first condenser 9, and the first condenser 9 is in circulating connection with the first cooling tower 1 through a first water return pipeline 15;
pipelines at water outlets of a third circulating water pump 5 and a fourth circulating water pump 6 are gathered to form a second water supply pipeline 14, the outlet end of the second water supply pipeline 14 is connected with a second condenser 10, and the second condenser 10 is circularly connected with a second cooling tower 2 through a second water return pipeline 16;
a first communication pipe is communicated between the first water supply pipeline 13 and the second water supply pipeline 14, and two circulating water supply communication doors which are arranged in series are arranged on the first communication pipe and respectively form a circulating water supply communication door I7 and a circulating water supply communication door II 8;
and a second connecting pipe is communicated between the first water return pipeline 15 and the second water return pipeline 16, and two circulating water return connecting doors which are arranged in series are arranged on the second connecting pipe and are respectively a circulating water return connecting door I11 and a circulating water return connecting door II 12.
In a preferred embodiment, at least one of the first circulating water pump 3 and the second circulating water pump 4 is turned on, and at least one of the third circulating water pump 5 and the fourth circulating water pump 6 is turned on; the first circulating water pump 3 and/or the second circulating water pump 4 and the third circulating water pump 5 and/or the fourth circulating water pump 6 may be turned on at the same time, or the third circulating water pump 5 and/or the fourth circulating water pump 6 may be turned off/on when the first circulating water pump 3 and/or the second circulating water pump 4 is turned on/off.
As a preferred embodiment, when the first circulating water pump 3 and/or the second circulating water pump 4 and the third circulating water pump 5 and/or the fourth circulating water pump 6 are/is opened simultaneously, the circulating water supply connection door i 7 and the circulating water supply connection door i 8, the circulating water return connection door i 11 and the circulating water return connection door i 12 can be opened simultaneously, or when the circulating water supply connection door i 7 and the circulating water supply connection door i 8 are opened/closed, the circulating water return connection door i 11 and the circulating water return connection door i 12 are closed/opened.
Example 1
As shown in fig. 1, a circulating water system based on a low pressure cylinder zero output operation mode includes two units, namely a unit one and a unit two, wherein the unit one and the unit two are respectively provided with a first cooling tower 1 and a second cooling tower 2 correspondingly, the first cooling tower 1 is connected with a first circulating water pump 3 and a second circulating water pump 4 which are arranged in parallel through pipelines, and the second cooling tower 2 is connected with a third circulating water pump 5 and a fourth circulating water pump 6 which are arranged in parallel through pipelines; pipelines at the water outlets of the first circulating water pump 3 and the second circulating water pump 4 are converged into one pipeline to form a first water supply pipeline 13, the outlet end of the first water supply pipeline 13 is connected with a first condenser 9, and the first condenser 9 is in circulating connection with the first cooling tower 1 through a first water return pipeline 15; pipelines at water outlets of a third circulating water pump 5 and a fourth circulating water pump 6 are gathered to form a second water supply pipeline 14, the outlet end of the second water supply pipeline 14 is connected with a second condenser 10, and the second condenser 10 is circularly connected with a second cooling tower 2 through a second water return pipeline 16; a first communication pipe is communicated between the first water supply pipeline 13 and the second water supply pipeline 14, and two circulating water supply communication doors which are arranged in series are arranged on the first communication pipe and respectively form a circulating water supply communication door I7 and a circulating water supply communication door II 8; and a second connecting pipe is communicated between the first water return pipeline 15 and the second water return pipeline 16, and two circulating water return connecting doors which are arranged in series are arranged on the second connecting pipe and are respectively a circulating water return connecting door I11 and a circulating water return connecting door II 12.
In the heat supply season, particularly when the low-pressure cylinder of the unit runs with zero output, one circulating water pump can provide circulating cooling water for the two units by adjusting the circulating water supply and return pipeline connection door and the circulating water cooling tower connection door of the two units. When the low-pressure cylinder is put into zero output, the steam quantity entering the low-pressure cylinder is only about 24t/h, the steam quantity entering the condenser mainly comprises low-pressure cylinder exhaust, feed pump turbine exhaust, low-pressure cylinder shaft seal leakage and the like, the total quantity of the steam entering the condenser is less than 100t/h, the total quantity of the steam entering the condenser is less than 720t/h in the heat supply season, particularly the total sum of the steam inlet flow of the two condensers in the cylinder cutting state is far less than 720t/h, and the requirements of the two condensers on the cooling water flow and the cooling pressure are completely met by using a single circulating water pump.
(1) A circulating water pump: each unit is provided with two circulating water pumps, and the circulating water pumps mainly provide circulating cooling water for the units and absorb heat released by steam in the condenser.
(2) A condenser: each unit is provided with a condenser, and the heat released by the steam is absorbed by circulating cooling water provided by a circulating pump.
(3) Cooling the tower: each unit is provided with a circulating water cooling tower, the temperature of cooling water is increased after the cooling water absorbs heat released by steam in a condenser during circulation, and the circulating cooling water with the increased temperature releases heat through the cooling tower to reduce the temperature.
(4) Circulating water supply connection door: the circulating pump outlet pipeline of two units sets up an interconnection pipe, sets up two electric valve on the export interconnection pipeline, and circulating water supplies water interconnection door promptly, through adjusting circulating water supply interconnection door, realizes the interconnection of two units circulating water supply pipe.
(5) Circulating water return connection door: set up an interconnection pipe on the circulating water return pipe way of two units, set up two electrically operated valve on the return water interconnection pipeline, circulating water return interconnection door promptly, through adjustment circulating water return interconnection door, realize two units circulating water return pipe way's interconnection.
One of the application methods of the present embodiment is:
(1) the first circulating water pump and the fourth circulating water pump operate, and the first condenser and the second condenser operate.
(2) And opening a circulating water supply connection door I and a circulating water supply connection door II.
(3) And opening a circulating water return connection door I and a circulating water return connection door II.
(4) And stopping the first circulating water pump or the fourth circulating water pump.
Economic benefits are as follows: the running current of a low-speed circulating water pump is about 145A, the power consumption per hour is 1.732 x 6kv x 145A 0.82 x 1 x 1235Kw.h, and the power consumption per hour is estimated to be saved by 1235 Kw.h.
Example 2
As shown in fig. 2, there are three units in this embodiment, three units correspond to and set up No. three cooling towers, and No. three cooling towers are connected with two circulating water pumps equally, and the pipeline of these two circulating water pump delivery port departments is gathered in one kind and is formed the third water supply pipe, and No. three condensers are connected to the exit end of third water supply pipe, and No. three condensers pass through third return water pipeline and No. three cooling tower circulation connection. And a third connecting pipe is communicated between the third water supply pipeline and the second water supply pipeline, and two circulating water supply connecting doors which are connected in series are arranged on the third connecting pipe. And a fourth connecting pipe is communicated between the third water return pipeline and the second water return pipeline, and two circulating water return connecting doors which are connected in series are arranged on the fourth connecting pipe.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. The utility model provides a circulating water system based on under low pressure jar zero output operation mode which characterized in that includes: the system comprises cooling towers, circulating water pumps and condensers, wherein each unit is correspondingly provided with one cooling tower, each cooling tower is connected with at least two circulating water pumps through a pipeline, the pipelines at the water outlet of the circulating water pumps are gathered to form a water supply pipeline, the outlet end of the water supply pipeline is connected with one condenser, and the condenser is circularly connected with the cooling towers through a water return pipeline;
the common intercommunication has first contact pipe between the water supply pipe of two adjacent cooling towers, sets up two at least circulating water supply contact doors on the first contact pipe, through adjusting circulating water supply contact door, realizes the contact of two units circulating water supply pipe.
2. The circulating water system based on the low-pressure cylinder zero-output operation mode as claimed in claim 1, wherein a second connecting pipe is commonly connected between the return pipes of two adjacent cooling towers, the second connecting pipe is provided with at least two circulating water return connecting doors, and the connection between the circulating water return pipes of the two units is realized by adjusting the circulating water return connecting doors.
3. The system of claim 2, wherein the circulating water return connection door is an electrically operated valve.
4. The circulating water system based on the zero-output operation mode of the low-pressure cylinder as claimed in claim 1 or 2, wherein the circulating water supply connection door is an electrically operated valve.
5. The circulating water system based on the low-pressure cylinder zero-output operation mode as claimed in claim 1, wherein the condenser is a surface heat exchanger.
6. The circulating water system based on the low-pressure cylinder zero-output operation mode as claimed in claim 2, wherein when two units are provided, the two units are respectively a unit one and a unit two, the unit one and the unit two are respectively provided with a first cooling tower (1) and a second cooling tower (2) correspondingly, the first cooling tower (1) is connected with a first circulating water pump (3) and a second circulating water pump (4) which are arranged in parallel through pipelines, and the second cooling tower (2) is connected with a third circulating water pump (5) and a fourth circulating water pump (6) which are arranged in parallel through pipelines;
pipelines at water outlets of the first circulating water pump (3) and the second circulating water pump (4) are converged into one pipeline to form a first water supply pipeline (13), the outlet end of the first water supply pipeline (13) is connected with a first condenser (9), and the first condenser (9) is circularly connected with the first cooling tower (1) through a first water return pipeline (15);
pipelines at water outlets of a third circulating water pump (5) and a fourth circulating water pump (6) are converged into one pipeline to form a second water supply pipeline (14), the outlet end of the second water supply pipeline (14) is connected with a second condenser (10), and the second condenser (10) is circularly connected with a second cooling tower (2) through a second water return pipeline (16);
a first connecting pipe is communicated between the first water supply pipeline (13) and the second water supply pipeline (14), and two circulating water supply connecting doors which are arranged in series are arranged on the first connecting pipe and respectively serve as a circulating water supply connecting door I (7) and a circulating water supply connecting door II (8);
and a second connecting pipe is communicated between the first water return pipeline (15) and the second water return pipeline (16), and two circulating water return connecting doors which are arranged in series are arranged on the second connecting pipe and are respectively a circulating water return connecting door I (11) and a circulating water return connecting door II (12).
7. A circulating water system based on a low pressure cylinder zero output operation mode as claimed in claim 6, characterized in that at least one of the first circulating water pump (3) and the second circulating water pump (4) is turned on, and at least one of the third circulating water pump (5) and the fourth circulating water pump (6) is turned on; the first circulating water pump (3) and/or the second circulating water pump (4) and the third circulating water pump (5) and/or the fourth circulating water pump (6) can be simultaneously opened, or when the first circulating water pump (3) and/or the second circulating water pump (4) are opened/closed, the third circulating water pump (5) and/or the fourth circulating water pump (6) are closed/opened.
8. The circulating water system based on the low-pressure cylinder zero-output operation mode as claimed in claim 7, wherein when the first circulating water pump (3) and/or the second circulating water pump (4) and the third circulating water pump (5) and/or the fourth circulating water pump (6) are/is opened simultaneously, the first circulating water supply connection door (7) and the second circulating water supply connection door (8) and the first circulating water return connection door (11) and the second circulating water return connection door (12) can be opened simultaneously, or when the first circulating water supply connection door (7) and the second circulating water supply connection door (8) are opened/closed, the first circulating water return connection door (11) and the second circulating water return connection door (12) are closed/opened.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122474990.0U CN216308658U (en) | 2021-10-14 | 2021-10-14 | Circulating water system based on low-pressure cylinder zero-output operation mode |
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| CN202122474990.0U CN216308658U (en) | 2021-10-14 | 2021-10-14 | Circulating water system based on low-pressure cylinder zero-output operation mode |
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| CN216308658U true CN216308658U (en) | 2022-04-15 |
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| CN202122474990.0U Active CN216308658U (en) | 2021-10-14 | 2021-10-14 | Circulating water system based on low-pressure cylinder zero-output operation mode |
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