CN110514048B - Cooling water saving process for circulating water pump of direct-current cooling water-heating power unit - Google Patents
Cooling water saving process for circulating water pump of direct-current cooling water-heating power unit Download PDFInfo
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- CN110514048B CN110514048B CN201910617932.3A CN201910617932A CN110514048B CN 110514048 B CN110514048 B CN 110514048B CN 201910617932 A CN201910617932 A CN 201910617932A CN 110514048 B CN110514048 B CN 110514048B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
- F28D2021/0028—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for cooling heat generating elements, e.g. for cooling electronic components or electric devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/56—Heat recovery units
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Abstract
The invention discloses a cooling water saving process for a circulating water pump of a direct-current cooling water-fired power unit, which uses circulating water of the circulating water pump as cooling water of the circulating water pump, and achieves the purposes of reducing the consumption of industrial water and saving water; and a path of circulating water is led from a circulating water outlet of the circulating water pump, the circulating water is treated and qualified through two stages of self-cleaning filters and then is used as cooling water of the circulating water pump, the cooling water is directly discharged along with the circulating water after heat exchange, and backwashing drainage water of the self-cleaning filters is directly discharged to a circulating water drainage ditch or a front pool. The invention is suitable for the direct-current cooling water-fired power unit, and can not adopt industrial water as the cooling water of the circulating water pump except the start-stop period of the circulating water pump, reduce the consumption of the industrial cooling water of the circulating water pump by more than 99 percent, and greatly reduce the water intake of unit power generation. The invention does not cut off the industrial cooling water source, and can realize the function of automatically switching back to the industrial cooling water when the self-cleaning filter fails or the produced water is unqualified, so as to ensure the safe and stable operation of the circulating water pump.
Description
Technical Field
The invention relates to a cooling water saving process for a circulating water pump of a direct-current cooling water-heating electric machine set.
Background
At present, because the quality of circulating water is poor and the content of silt is high, the cooling water of a circulating water pump of a thermal power generating unit adopting direct-current cooling water adopts industrial water, such as Chinese patent with application number of 201420281317.2. Taking a certain power plant in Hubei as an example, the plant has 2 units of 350MW and 2 units of 660MW, and the circulating water pump uses cooling water per seAbout 96 m in hours3And h, directly discharging the cooling water to a circulating water drainage ditch after heat exchange, and discharging the cooling water along with the circulating water.
The invention designs a new water-saving process, wherein a path of circulating water is led from an outlet pipe of a circulating water pump, the circulating water is treated and qualified through a self-cleaning filter and then is used as cooling water of the circulating water pump, the cooling water is directly discharged along with the circulating water, and backwashing drainage of the self-cleaning filter is directly discharged.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a water-saving process for cooling water of a circulating water pump of a direct-current cooling water-thermal power generating unit, which is reasonable in design.
The technical scheme adopted by the invention for solving the problems is as follows: a cooling water saving process of a circulating water pump of a direct-current cooling water-thermal power unit is characterized in that circulating water of the circulating water pump is used as cooling water of the circulating water pump, so that the purposes of reducing the consumption of industrial water and saving water are achieved; the process comprises the following steps: and a path of circulating water is led from a circulating water outlet of the circulating water pump, the circulating water is treated and qualified through a first-stage self-cleaning filter and a second-stage self-cleaning filter and then is used as cooling water of the circulating water pump, the cooling water is directly discharged along with the circulating water after heat exchange, and backwashing drainage water of the first-stage self-cleaning filter and the second-stage self-cleaning filter is directly discharged to a circulating water drainage ditch or a forebay.
Furthermore, the primary self-cleaning filter is used for removing larger particulate matters in the circulating water and primarily filtering the circulating water. The secondary self-cleaning filter has higher precision and is used for further removing fine suspended matters in the circulating water to ensure that the effluent turbidity meets the water quality requirement of industrial water, and the water produced by the secondary self-cleaning filter is used as cooling water for the circulating water pump.
Furthermore, the process is suitable for a direct-current cooling water-heating power unit, industrial water is not used as cooling water of the circulating water pump except the start-stop time period of the circulating water pump, the industrial cooling water consumption of the circulating water pump is reduced by more than 99%, and the unit power generation water intake is greatly reduced.
Furthermore, after heat exchange, cooling water of the circulating water pump is directly discharged along with circulating water, and the water quality of the circulating water drainage is not affected.
Furthermore, backwashing drainage of the first-stage self-cleaning filter and the second-stage self-cleaning filter is directly discharged along with circulating water, and the quality of the circulating water drainage is not affected. The filtering device adopts a self-cleaning filter, does not cut off flow and add medicine, and is simple to operate.
Furthermore, industrial cooling water is used at the initial stage of starting the circulating water pump, and is not used after the circulating water pump runs stably.
Further, a cooling water inlet of the circulating water pump is connected with an industrial water supply pipeline, an automatic valve II is installed on the industrial water supply pipeline, and a cooling water outlet of the circulating water pump is communicated with a circulating water drainage ditch; a circulating water outlet of the circulating water pump is connected with the first-stage self-cleaning filter through a first circulating water conveying pipeline, an automatic valve III is arranged on the first circulating water conveying pipeline, and the first-stage self-cleaning filter is connected with the second-stage self-cleaning filter through a second circulating water conveying pipeline; the water production pipeline of the second-stage self-cleaning filter is divided into two paths, one path of water production pipeline is connected with a cooling water inlet of the circulating water pump, a turbidimeter and an automatic valve I are installed on the one path of water production pipeline, the other path of water production pipeline is connected with a circulating water drainage ditch, and an automatic valve IV is installed on the other path of water production pipeline.
Furthermore, the backwashing drainage pipeline of the first-stage self-cleaning filter and the backwashing drainage pipeline of the second-stage self-cleaning filter are communicated with the circulating water drainage ditch.
Furthermore, the turbidity meter is arranged at a water outlet of the secondary self-cleaning filter, and the automatic valve I is arranged at a cooling water inlet of the circulating water pump.
The process flow is as follows:
1) at the initial stage of starting the circulating water pump, the automatic valve II is opened, the automatic valve I and the automatic valve III are closed, and the cooling water of the circulating water pump uses industrial water;
2) after the circulating water pump operates stably, the automatic valve III and the automatic valve IV are opened, the first-stage self-cleaning filter and the second-stage self-cleaning filter are put into operation, and initial-stage produced water generated by the operation of the first-stage self-cleaning filter and the second-stage self-cleaning filter is discharged to a circulating water drainage ditch;
3) the turbidity meter monitors the quality of the produced water of the secondary self-cleaning filter, the turbidity meter is linked with the automatic valve III and the automatic valve IV, and after the water produced by the secondary self-cleaning filter is stable and the turbidity meets the requirement of the quality of the industrial water, the automatic valve I is opened, and the automatic valve IV and the automatic valve II are closed; at the moment, all the cooling water of the circulating water pump adopts circulating water which is qualified in treatment;
4) the cooling water drainage of the circulating water pump, the backwashing drainage of the first-stage self-cleaning filter and the second-stage self-cleaning filter, and the unqualified produced water of the first-stage self-cleaning filter and the second-stage self-cleaning filter are all drained to a circulating water drainage ditch;
5) before the circulating water pump is ready to stop pumping, the cooling water source needs to be switched back to the industrial water due to unstable flow of the circulating water pump outlet; opening the automatic valve II and the automatic valve IV, and closing the automatic valve I and the automatic valve III to complete the step of switching the cooling water back to the industrial water;
6) when the water quality fluctuation of a circulating water outlet of the circulating water pump is large and the turbidity of the produced water of the secondary self-cleaning filter is unqualified, the water source of the cooling water needs to be switched back to the industrial water; namely, the automatic valve II and the automatic valve IV are opened, and the automatic valve I and the automatic valve III are closed, so that the step sequence of switching the cooling water back to the industrial water is completed.
The invention does not cut off the industrial cooling water source, and can realize the function of automatically switching back to the industrial cooling water when the self-cleaning filter fails or the water produced by the self-cleaning filter is unqualified, so as to ensure the safe and stable operation of the circulating water pump.
Compared with the prior art, the invention has the following advantages and effects:
(1) the invention uses the circulating water of the circulating water pump as cooling water, can effectively save the industrial water consumption, and can greatly reduce the unit generating capacity and the water intake.
(2) The water outlet of the second-stage self-cleaning filter is directly connected to the inlet of a cooling water pipe of the circulating water pump, and no chemical is added in the treatment process, so that the cooling water can be directly discharged along with the circulating water after heat exchange is completed, the backwashing water discharge of the self-cleaning filter is directly discharged along with the circulating water discharge, a closed-loop process that the cooling water is taken from the circulating water and is discharged into the circulating water after use is achieved, and the quality of the circulating water is not changed in the process.
(3) Automatic valves are respectively arranged on the led-out circulating water pipeline, the industrial water pipeline of the cooling water inlet of the circulating water pump and the water production pipeline of the secondary self-cleaning filter, so that the automatic switching function of the industrial water and the circulating water is realized.
(4) The turbidity meter is arranged on the water production pipeline of the secondary self-cleaning filter and is interlocked with the respective action valve, so that the function of automatically switching the cooling water into industrial water when the water production of the secondary self-cleaning filter is unqualified is realized.
Drawings
Fig. 1 is a flow chart of the working principle of cooling water of a conventional circulating water pump.
Fig. 2 is a flow chart of the working principle of an embodiment of the present invention.
In the figure: the automatic water supply system comprises an automatic valve I1, a turbidity meter 2, a primary self-cleaning filter 3, a secondary self-cleaning filter 4, an automatic valve II 5, an automatic valve III 6, a circulating water pump 7, an automatic valve IV 8, a circulating water drainage ditch 9, an industrial water supply pipeline 10, a circulating water conveying pipeline I11 and a circulating water conveying pipeline II 12.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
Example 1.
Referring to fig. 2, in the cooling water saving process of the circulating water pump of the dc cooling water-fired power unit in the embodiment, a path of circulating water is led from the circulating water outlet of the circulating water pump 7, and the circulating water is treated and qualified by the primary self-cleaning filter 3 and the secondary self-cleaning filter 4 and then used as the cooling water of the circulating water pump 7, so as to achieve the purposes of saving the industrial water consumption and reducing the water intake amount per unit power generation amount.
In the embodiment, a cooling water inlet of the circulating water pump 7 is connected with an industrial water supply pipeline 10, an automatic valve II 5 is arranged on the industrial water supply pipeline 10, and a cooling water outlet of the circulating water pump 7 is communicated with a circulating water drainage ditch 9; a circulating water outlet of the circulating water pump 7 is connected with the primary self-cleaning filter 3 through a first circulating water conveying pipeline 11, an automatic valve III 6 is installed on the first circulating water conveying pipeline 11, and the primary self-cleaning filter 3 is connected with the secondary self-cleaning filter 4 through a second circulating water conveying pipeline 12; the water production pipeline of the second-stage self-cleaning filter 4 is divided into two paths, one path of water production pipeline is connected with a cooling water inlet of the circulating water pump 7, a turbidity meter 2 and an automatic valve I1 are installed on the one path of water production pipeline, the other path of water production pipeline is connected with a circulating water drainage ditch 9, and an automatic valve IV 8 is installed on the other path of water production pipeline. The backwashing water discharge pipeline of the first-stage self-cleaning filter 3 and the backwashing water discharge pipeline of the second-stage self-cleaning filter 4 are communicated with a circulating water discharge ditch 9. The turbidity meter 2 is arranged at a water outlet of the secondary self-cleaning filter 4, and the automatic valve I1 is arranged at a cooling water inlet of the circulating water pump 7.
The process flow is as follows:
1) at the initial stage of starting the circulating water pump 7, the automatic valve II 5 is opened, the automatic valve I1 and the automatic valve III 6 are closed, and the cooling water of the circulating water pump 7 uses industrial water;
2) after the circulating water pump 7 operates stably, the automatic valve III 6 and the automatic valve IV 8 are opened, the first-stage self-cleaning filter 3 and the second-stage self-cleaning filter 4 are put into operation, and initial-stage produced water generated by the operation of the first-stage self-cleaning filter 3 and the second-stage self-cleaning filter 4 is discharged to a circulating water drainage ditch 9;
3) the turbidity meter 2 monitors the quality of the produced water of the secondary self-cleaning filter 4, the turbidity meter 2 is linked with the automatic valve III 6 and the automatic valve IV 8, and after the produced water of the secondary self-cleaning filter 4 is stable and the turbidity meets the requirement of the quality of the industrial water, the automatic valve I1 is opened, and the automatic valve IV 8 and the automatic valve II 5 are closed; at the moment, all the cooling water of the circulating water pump 7 adopts circulating water which is qualified in treatment;
4) the cooling water drainage of the circulating water pump 7, the backwashing drainage of the first-stage self-cleaning filter 3 and the second-stage self-cleaning filter 4 and the unqualified produced water of the first-stage self-cleaning filter 3 and the second-stage self-cleaning filter 4 are all drained to a circulating water drainage ditch 9;
5) before the circulating water pump 7 is ready to stop pumping, the cooling water source needs to be switched back to the industrial water because the flow of the outlet of the circulating water pump 7 is unstable; namely, opening the automatic valve II 5 and the automatic valve IV 8, closing the automatic valve I1 and the automatic valve III 6, and completing the step of switching the cooling water back to the industrial water;
6) when the water quality fluctuation of the circulating water outlet of the circulating water pump 7 is large and the turbidity of the produced water of the secondary self-cleaning filter 4 is unqualified, the water source of the cooling water needs to be switched back to the industrial water; namely, the automatic valve II 5 and the automatic valve IV 8 are opened, the automatic valve I1 and the automatic valve III 6 are closed, and the step sequence of switching the cooling water back to the industrial water is completed.
Example 2.
The capacity of a direct-current cooling water coal-fired unit at the edge of the long river in Hubei is 2 units of 350MW and 2 units of 660MW, and during a water balance test period in summer, the consumption of industrial cooling water of circulating water pumps of 4 units is 96 m3And h, directly discharging the industrial cooling water along with the circulating water after heat exchange. According to the calculation of 5000 hours of annual utilization of the unit, the factory discharges 480000 m of industrial water all the year round3。
After the technical transformation of the invention, the circulating water pump room of the first-stage 2 350MW unit is provided with a set of two-stage self-cleaning filtering system, and the circulating water pump room of the second-stage 2 MW unit is provided with a set of two-stage self-cleaning filtering system, so that the circulating water is successfully treated and qualified to replace industrial cooling water for use, and the running condition of each circulating water pump is good at present.
When the start and stop of the unit are removed all the year round and the fluctuation of the water quality of circulating water is large in rainy season, no industrial cooling water is used by the circulating water pump, and the industrial cooling water quantity saved all the year round exceeds 475000 m3Greatly reduces the water intake of a power generation unit.
Example 3.
The capacity of a certain direct-current cooling water coal-fired unit in Hunan is 2 units of 350MW, and the industrial cooling water consumption of circulating water pumps of 2 units is37 m3And h, directly discharging the industrial cooling water along with the circulating water after heat exchange. Calculated according to the annual utilization of the units for 4400 hours, the industrial water is discharged from the factory all the year round by 162800 m3。
After the technology of the invention is improved, a set of two-stage self-cleaning filtering system is arranged in the circulating water pump room, the circulating water is successfully treated and qualified and then used in place of industrial cooling water, and the running condition of each circulating water pump is good at present. When the start and stop of the unit are removed all the year round and the fluctuation of the water quality of circulating water is large in rainy season, no industrial cooling water is used by the circulating water pump, and the industrial cooling water quantity saved all the year round exceeds 161200 m3Greatly reduces the water intake of a power generation unit.
Although the present invention has been described with reference to the above embodiments, it should be understood that the scope of the present invention is not limited thereto, and modifications made by those skilled in the art without departing from the spirit and scope of the present invention are also within the scope of the present invention.
Claims (4)
1. A cooling water saving process of a circulating water pump of a direct-current cooling water-heating electric machine set is characterized in that circulating water of a circulating water pump (7) is used as cooling water of the circulating water pump, so that the purposes of reducing the consumption of industrial water and saving water are achieved; the process comprises the following steps: a path of circulating water is led from a circulating water outlet of a circulating water pump (7), the circulating water is qualified after being treated by a first-stage self-cleaning filter (3) and a second-stage self-cleaning filter (4) and then is used as cooling water of the circulating water pump (7), the cooling water is directly discharged along with the circulating water after heat exchange, and backwashing drainage water of the first-stage self-cleaning filter (3) and the second-stage self-cleaning filter (4) is directly discharged to a circulating water drainage ditch (9) or a front pool;
a cooling water inlet of the circulating water pump (7) is connected with an industrial water supply pipeline (10), an automatic valve II (5) is installed on the industrial water supply pipeline (10), and a cooling water outlet of the circulating water pump (7) is communicated with a circulating water drainage ditch (9); a circulating water outlet of the circulating water pump (7) is connected with the first-stage self-cleaning filter (3) through a first circulating water conveying pipeline (11), an automatic valve III (6) is installed on the first circulating water conveying pipeline (11), and the first-stage self-cleaning filter (3) is connected with the second-stage self-cleaning filter (4) through a second circulating water conveying pipeline (12); the water production pipeline of the secondary self-cleaning filter (4) is divided into two ways, one way of water production pipeline is connected with a cooling water inlet of a circulating water pump (7), a turbidity meter (2) and an automatic valve I (1) are installed on the one way of water production pipeline, the other way of water production pipeline is connected with a circulating water drainage ditch (9), and an automatic valve II (8) is installed on the other way of water production pipeline;
the process flow is as follows:
1) at the initial stage of starting the circulating water pump (7), the automatic valve II (5) is opened, the automatic valve I (1) and the automatic valve III (6) are closed, and the cooling water of the circulating water pump (7) uses industrial water;
2) after the circulating water pump (7) operates stably, an automatic valve III (6) and an automatic valve IV (8) are opened, a first-stage self-cleaning filter (3) and a second-stage self-cleaning filter (4) are put into operation, and initial-stage produced water generated by the operation of the first-stage self-cleaning filter (3) and the second-stage self-cleaning filter (4) is discharged to a circulating water drainage ditch (9);
3) the turbidity meter (2) monitors the quality of produced water of the secondary self-cleaning filter (4), the turbidity meter (2) is linked with the automatic valve III (6) and the automatic valve IV (8), and after the water produced by the secondary self-cleaning filter (4) is stable and the turbidity meets the requirement of the quality of industrial water, the automatic valve I (1) is opened, and the automatic valve IV (8) and the automatic valve II (5) are closed; at the moment, all the cooling water of the circulating water pump (7) adopts circulating water qualified for treatment;
4) the cooling water drainage of the circulating water pump (7), the backwashing drainage of the first-stage self-cleaning filter (3) and the second-stage self-cleaning filter (4), and the unqualified produced water of the first-stage self-cleaning filter (3) and the second-stage self-cleaning filter (4) are all drained to a circulating water drainage ditch (9);
5) before the circulating water pump (7) is ready to stop pumping, the cooling water source needs to be switched back to the industrial water because the flow of the outlet of the circulating water pump (7) is unstable; namely, opening the automatic valve II (5) and the automatic valve IV (8), closing the automatic valve I (1) and the automatic valve III (6), and completing the step sequence of switching the cooling water back to the industrial water;
6) when the water quality fluctuation of a circulating water outlet of the circulating water pump (7) is large and the turbidity of the produced water of the secondary self-cleaning filter (4) is unqualified, the water source of the cooling water needs to be switched back to the industrial water; namely, the automatic valve II (5) and the automatic valve IV (8) are opened, and the automatic valve I (1) and the automatic valve III (6) are closed, so that the step sequence of switching the cooling water back to the industrial water is completed.
2. The water-saving process for cooling water of the circulating water pump of the direct-current cooling water-fire-electric generator set according to claim 1, wherein industrial cooling water is used at the initial stage of starting the circulating water pump (7), and the industrial cooling water is not used after the circulating water pump (7) is stably operated.
3. The water-saving process for cooling water of a circulating water pump of a direct-current cooling water-fire-electric machine set according to claim 1, characterized in that a backwashing water discharge pipeline of the primary self-cleaning filter (3) and a backwashing water discharge pipeline of the secondary self-cleaning filter (4) are both communicated with a circulating water discharge ditch (9).
4. The water-saving process for cooling water of a circulating water pump of a direct-current cooling water-heating power generation unit according to claim 1, characterized in that the turbidity meter (2) is arranged at a water production outlet of the secondary self-cleaning filter (4), and the automatic valve I (1) is arranged at a cooling water inlet of the circulating water pump (7).
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| CN111238132B (en) * | 2020-03-13 | 2021-08-10 | 上海甦源能源科技有限公司 | Energy-saving industrial circulating water system and operation method thereof |
| CN115430515B (en) * | 2022-08-10 | 2024-04-05 | 华能聊城热电有限公司 | Cooling water switching device of coal mill |
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| CN207033743U (en) * | 2017-04-24 | 2018-02-23 | 宜宾海丝特纤维有限责任公司 | A kind of vavuum pump cooling water recycling system |
| CN209020004U (en) * | 2018-10-18 | 2019-06-25 | 宿迁新亚科技有限公司 | One kind being used for aeration tower recirculated water self-cleaning filter device |
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| CN110514048A (en) | 2019-11-29 |
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