CN110207014B - Protection system for preventing overpressure at inlet of condensate pump and operation method - Google Patents
Protection system for preventing overpressure at inlet of condensate pump and operation method Download PDFInfo
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- CN110207014B CN110207014B CN201910487755.1A CN201910487755A CN110207014B CN 110207014 B CN110207014 B CN 110207014B CN 201910487755 A CN201910487755 A CN 201910487755A CN 110207014 B CN110207014 B CN 110207014B
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- condensate pump
- pressure gauge
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/08—Pipe-line systems for liquids or viscous products
- F17D1/14—Conveying liquids or viscous products by pumping
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
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- Mechanical Engineering (AREA)
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Abstract
The invention belongs to the technical field of thermal power generation, relates to a condensate pump overhauling and isolating operation technology for a thermal power plant, and particularly relates to a protection system and an operation method for preventing overpressure at an inlet of a condensate pump; the condensate pump and the standby condensate pump are provided with protection systems, so that correct isolation operation can be realized, and the overpressure damage of an inlet pipeline is avoided; by applying the protection system and the operation method, whether the outlet valve A and the check valve A of the condensate pump or the outlet valve B and the check valve B of the standby condensate pump are tightly closed can be judged, and the phenomenon of overpressure damage of an inlet pipeline in the process of isolating the condensate pump or the standby condensate pump can be effectively prevented.
Description
Technical Field
The invention belongs to the technical field of thermal power generation, relates to a condensate pump overhauling and isolating operation technology for a thermal power plant, and particularly relates to a protection system for preventing an inlet of a condensate pump from being over-pressurized and an operation method.
Background
A condensate pump for a thermal power plant is an important auxiliary machine for power generation production, and mainly has the advantages that water in a condenser is boosted and then is conveyed to a deaerator through a low-pressure heater, the pressure bearing capacity of an outlet pipeline of the condensate pump is designed according to the door closing pressure of the condensate pump, and the normal operation pressure is generally about 2 Mpa; the pressure bearing capacity of the inlet pipeline is designed according to 0.1Mpa, and the actual operation pressure is condenser pressure (-90 kPa).
In the production process of a thermal power plant, faults such as condensate pump faults and inlet filter screen blockage can occur, and the condensate pump needs to be isolated and overhauled. Because the unit is running, the condensate header pressure is high (about 2MPa), if the outlet valve and the check valve of the condensate pump are not closed tightly, the overpressure damage of the inlet pipeline of the condensate pump can occur in the isolation process. Before the fault condensate pump is isolated, whether an outlet valve and a check valve of the condensate pump are closed tightly is judged, and the key for preventing the condensate pump inlet pipeline from being damaged by overpressure is provided.
Disclosure of Invention
According to the defects of the prior art, the invention provides the protection system and the operation method for preventing the overpressure of the condensate pump inlet.
The protection system for preventing the overpressure at the inlet of the condensate pump comprises a condenser and the condensate pump which are connected through a pipeline, wherein an inlet valve A is arranged on the pipeline between the outlet end of the condenser and the inlet end of the condensate pump, the outlet end of the condensate pump is connected with a deaerator through the pipeline, a check valve A and an outlet valve A are sequentially arranged on the pipeline between the outlet end of the condensate pump and the deaerator, a pressure gauge A and a bypass pipeline A are sequentially arranged on the pipeline between the check valve A and the outlet valve A, and a water drain valve A is arranged on the bypass pipeline A; a standby condensate pump is connected in parallel between the condenser and the deaerator, an inlet valve B is arranged on a pipeline between the outlet end of the condenser and the inlet end of the standby condensate pump, the outlet end of the standby condensate pump is connected with the deaerator through a pipeline, and a check valve B and an outlet valve B are sequentially arranged on the pipeline between the outlet end of the standby condensate pump and the deaerator; and a main pipe pressure gauge is arranged on a serial main pipe of the deaerator after the condensate pump and the standby condensate pump are connected in parallel.
Wherein, the preferred scheme is as follows:
and a pressure gauge B and a bypass pipeline B are arranged on the pipeline between the check valve B and the outlet valve B, and a water drain valve B is arranged on the bypass pipeline B.
An inlet filter screen A is arranged on a pipeline between the inlet valve A and the inlet end of the condensate pump.
And an inlet filter screen B is arranged on a pipeline between the inlet valve B and the inlet end of the standby condensate pump.
The operation method of the protection system for preventing the overpressure of the condensate pump inlet comprises the following steps:
(1) when the condensate pump fails, starting a standby condensate pump and showing normal operation;
(2) closing the outlet valve a of the condensate pump and shutting down the condensate pump;
(3) observing whether the condensate pump can be completely stopped, if the condensate pump is inverted, indicating that an outlet valve A and a check valve A of the condensate pump are not tightly closed and the condensate pump cannot be isolated, and checking and overhauling the outlet valve A and the check valve A;
(4) when the condensate pump is completely static, observing a pressure gauge A, if the pressure gauge A displays that the numerical value is consistent with the pressure reading of a pressure gauge of the main pipe, indicating that the check valve A is tightly closed, then opening a water drain valve A, when the numerical value displayed by the pressure gauge A is reduced, closing the water drain valve A, and observing whether the reading of the pressure gauge A rises, if the reading of the pressure gauge A does not rise for a long time, indicating that the outlet valve A is tightly closed, otherwise, the outlet valve A is not tightly closed;
if the reading of the pressure gauge A is obviously reduced compared with the reading of the pressure gauge of the main pipe, the check valve A is not closed tightly, and the phenomenon of overpressure damage of an inlet pipeline can occur in the process of isolating the condensate pump.
In addition, when the standby condensate pump also fails, the standby condensate pump is isolated according to the following operation method:
(1) when the standby condensate pump also fails, closing an outlet valve B of the standby condensate pump, and stopping the standby condensate pump;
(2) observing whether the standby condensate pump can be completely stopped, if the standby condensate pump is inverted, indicating that an outlet valve B and a check valve B of the standby condensate pump are not tightly closed and the standby condensate pump cannot be isolated, and checking and overhauling the outlet valve B and the check valve B;
(3) when the standby condensate pump is completely static, observing a pressure gauge B, if the pressure gauge B displays a numerical value consistent with the pressure reading of the master pipe pressure gauge, indicating that the check valve B is tightly closed, then opening a water drain valve B, when the pressure gauge B displays a numerical value reduced, closing the water drain valve B, and observing whether the reading of the pressure gauge B rises, if the reading of the pressure gauge B does not rise for a long time, indicating that the outlet valve B is tightly closed, otherwise, not tightly closing the outlet valve B;
if the reading of the pressure gauge B is obviously reduced compared with the reading of the pressure gauge of the main pipe, which indicates that the check valve B is not closed tightly, the phenomenon of overpressure damage of an inlet pipeline can occur in the process of isolating the standby condensate pump.
The invention has the advantages that: (1) by connecting the standby condensate pumps in parallel, the condensate pumps can continue to operate when the condensate pumps are in fault, so that the continuity and effectiveness of work are ensured; (2) the condensate pump and the standby condensate pump are provided with protection systems, so that correct isolation operation can be realized, and the overpressure damage of an inlet pipeline is avoided; (3) by applying the protection system and the operation method, whether the outlet valve A and the check valve A of the condensate pump or the outlet valve B and the check valve B of the standby condensate pump are tightly closed can be judged, and the phenomenon of overpressure damage of an inlet pipeline in the process of isolating the condensate pump or the standby condensate pump can be effectively prevented.
Drawings
FIG. 1 is a schematic view of a system according to embodiment 1 of the present invention;
FIG. 2 is a schematic system diagram according to embodiment 2 of the present invention;
FIG. 3 is a schematic diagram of a prior art system;
in the figure: 1. the system comprises a condenser 2, an inlet valve A3, an inlet filter screen A4, a condensate pump 5, a check valve A6, a pressure gauge A7, a drain valve A8, an outlet valve A9, an inlet valve B10, an inlet filter screen B11, a spare condensate pump 12, a check valve B13, a pressure gauge B14, a drain valve B15, an outlet valve B16 and a main pipe pressure gauge.
Detailed Description
The present invention will be further described with reference to the following examples and the accompanying drawings.
Example 1:
as shown in fig. 1, a protection system for preventing an inlet of a condensate pump from being in overpressure includes a condenser 1 and a condensate pump 4 connected by a pipeline, an inlet valve a2 is arranged on the pipeline between an outlet end of the condenser 1 and an inlet end of the condensate pump 4, an outlet end of the condensate pump 4 is connected with a deaerator by a pipeline, a check valve a5 and an outlet valve A8 are sequentially arranged on the pipeline between the outlet end of the condensate pump 4 and the deaerator, a pressure gauge a6 and a bypass pipeline a are sequentially arranged on the pipeline between the check valve a5 and the outlet valve A8, and a drain valve a7 is arranged on the bypass pipeline a; a standby condensate pump 11 is connected in parallel between the condenser 1 and the deaerator, an inlet valve B9 is arranged on a pipeline between the outlet end of the condenser 1 and the inlet end of the standby condensate pump 11, the outlet end of the standby condensate pump 11 is connected with the deaerator through a pipeline, and a check valve B12 and an outlet valve B15 are sequentially arranged on the pipeline between the outlet end of the standby condensate pump 11 and the deaerator; and a main pipe pressure gauge 16 is arranged on a serial main pipe of the deaerator after the condensate pump 4 and the standby condensate pump 11 are connected in parallel.
An inlet filter screen A3 is arranged on the pipeline between the inlet valve 2A and the inlet end of the condensate pump 4.
An inlet screen B10 is arranged on a pipeline between the inlet valve B9 and the inlet end of the spare condensate pump 11.
The method of operating a protection system for preventing an inlet of a condensate pump from being overpressurized according to this embodiment comprises the steps of:
(1) when the condensate pump 4 fails, the standby condensate pump 11 is started and operates normally;
(2) closing the outlet valve A8 of the condensate pump 4 and shutting down the condensate pump 4;
(3) observing whether the condensate pump 4 can be completely stopped, if the condensate pump 4 is inverted, indicating that the outlet valve A8 and the check valve A5 of the condensate pump 4 are not closed tightly and the condensate pump 4 cannot be isolated, and checking and overhauling the outlet valve A8 and the check valve A5;
(4) when the condensate pump 4 is completely static, observing a pressure gauge A6, if the pressure gauge A6 shows that the numerical value is consistent with the pressure reading of the mother pipe pressure gauge 16, indicating that the check valve A5 is tightly closed, then opening a water drain valve A7, when the pressure gauge A6 shows that the numerical value is reduced, closing a water drain valve A7, and observing whether the reading of the pressure gauge A6 rises, if the reading of the pressure gauge A6 does not rise for a long time, indicating that the outlet valve A8 is tightly closed, otherwise, closing the outlet valve A8 is not tightly closed;
if the reading of the pressure gauge A6 is obviously reduced compared with the reading of the pressure gauge 16 of the main pipe, which indicates that the closing of the check valve A5 is not tight, the phenomenon of overpressure damage of the inlet pipeline can occur in the process of isolating the condensate pump 4.
Example 2:
as shown in fig. 2, the present embodiment has the same system structure as that of embodiment 1, but on the route of the backup condensate pump 11, a pressure gauge B13 and a bypass pipe B are provided on the pipe between the check valve B12 and the outlet valve B15, and a drain valve B14 is provided on the bypass pipe B.
When the backup condensate pump 11 also fails, the backup condensate pump 11 is isolated according to the following method of operation:
(1) when the backup condensate pump 11 also fails, the outlet valve B15 of the backup condensate pump 11 is closed, and the backup condensate pump 11 is stopped;
(2) observing whether the standby condensate pump 11 can be completely stopped, if the standby condensate pump 11 is inverted, indicating that the outlet valve B15 and the check valve B12 of the standby condensate pump 11 are not tightly closed and the standby condensate pump 11 cannot be isolated, and checking and overhauling the outlet valve B15 and the check valve B12;
(3) when the standby condensate pump 11 is completely static, a pressure gauge B13 is observed, if the pressure gauge B13 shows that the numerical value is consistent with the pressure reading of a master pipe pressure gauge 16, the check valve B12 is indicated to be closed tightly, then a water drain valve B14 is opened, when the pressure gauge B13 shows that the numerical value is reduced, the water drain valve B14 is closed, whether the reading of the pressure gauge B13 rises or not is observed, if the reading of the pressure gauge B13 does not rise for a long time, the outlet valve B15 is indicated to be closed tightly, and otherwise, the outlet valve B15 is not closed tightly;
if the reading of the pressure gauge B13 is obviously lower than that of the pressure gauge 16 of the main pipe, which indicates that the check valve B12 is not closed tightly, the phenomenon of overpressure damage of the inlet pipeline can occur in the process of isolating the standby condensate pump 11.
Comparative example 1:
as shown in fig. 3, in the prior art, the condenser is only connected with a set of condensate pump 4, and when the condensate pump 4 fails and the inlet filter screen a3 is blocked, the condensate pump 4 needs to be isolated and overhauled. Because the unit is running, the condensate header pressure is high (about 2MPa), if the outlet valve A8 and the check valve A5 of the condensate pump 4 are not closed tightly, the inlet pipeline of the condensate pump 4 may be damaged by overpressure in the isolation process. Before the fault condensate pump 4 is isolated, the system cannot judge whether the outlet valve A8 and the check valve A5 of the condensate pump 4 are closed tightly.
Claims (5)
1. The utility model provides a prevent protection system of condensate pump entry superpressure, includes condenser, condensate pump through the pipe connection, be provided with inlet valve A on the pipeline between the exit end of condenser and condensate pump's the entry end, condensate pump's exit end passes through the pipeline and links to each other with the oxygen-eliminating device, set gradually check valve A and outlet valve A on condensate pump's the pipeline between exit end and the oxygen-eliminating device, its characterized in that: a pressure gauge A and a bypass pipeline A are sequentially arranged on a pipeline between the check valve A and the outlet valve A, and a water drain valve A is arranged on the bypass pipeline A; a standby condensate pump is connected in parallel between the condenser and the deaerator, an inlet valve B is arranged on a pipeline between the outlet end of the condenser and the inlet end of the standby condensate pump, the outlet end of the standby condensate pump is connected with the deaerator through a pipeline, and a check valve B and an outlet valve B are sequentially arranged on a pipeline between the outlet end of the standby condensate pump and the deaerator; a main pipe pressure gauge is arranged on a serial main pipe of the deaerator after the condensate pump and the standby condensate pump are connected in parallel;
the protection system, when in operation, comprises the steps of:
(1) when the condensate pump fails, starting a standby condensate pump and showing normal operation;
(2) closing the outlet valve a of the condensate pump and shutting down the condensate pump;
(3) observing whether the condensate pump can be completely stopped, if the condensate pump is inverted, indicating that an outlet valve A and a check valve A of the condensate pump are not tightly closed and the condensate pump cannot be isolated, and checking and overhauling the outlet valve A and the check valve A;
(4) when the condensate pump is completely static, observing a pressure gauge A, if the pressure gauge A displays that the numerical value is consistent with the pressure reading of the pressure gauge of the main pipe, indicating that the check valve A is tightly closed, then opening a water drain valve A, closing the water drain valve A after the numerical value displayed by the pressure gauge A is reduced, and observing whether the reading of the pressure gauge A rises, if the reading of the pressure gauge A does not rise for a long time, indicating that the outlet valve A is tightly closed, otherwise, indicating that the outlet valve A is not tightly closed;
if the reading of the pressure gauge A is obviously reduced compared with the reading of the pressure gauge of the main pipe, the check valve A is not closed tightly, and the phenomenon of overpressure damage of an inlet pipeline can occur in the process of isolating the condensate pump.
2. A protection system for preventing overpressure in a condensate pump inlet as recited in claim 1, wherein: and a pressure gauge B and a bypass pipeline B are arranged on the pipeline between the check valve B and the outlet valve B, and a water drain valve B is arranged on the bypass pipeline B.
3. A protection system against condensate pump inlet overpressure as claimed in claim 1 or 2, characterized in that: an inlet filter screen A is arranged on a pipeline between the inlet valve A and the inlet end of the condensate pump.
4. A protection system against condensate pump inlet overpressure as claimed in claim 1 or 2, characterized in that: and an inlet filter screen B is arranged on a pipeline between the inlet valve B and the inlet end of the standby condensate pump.
5. A protection system for preventing overpressure in a condensate pump inlet as recited in claim 2, further comprising the steps of, in operation:
(1) when the standby condensate pump also fails, closing an outlet valve B of the standby condensate pump, and stopping the standby condensate pump;
(2) observing whether the standby condensate pump can be completely stopped, if the standby condensate pump is inverted, indicating that the outlet valve B and the check valve B of the standby condensate pump are not tightly closed and the standby condensate pump cannot be isolated, and checking and overhauling the outlet valve B and the check valve B;
(3) when the standby condensate pump is completely static, observing a pressure gauge B, if the pressure gauge B displays a numerical value consistent with the pressure reading of the pressure gauge of the main pipe, indicating that the check valve B is tightly closed, then opening a water drain valve B, when the pressure gauge B displays a numerical value reduced, closing the water drain valve B, and observing whether the reading of the pressure gauge B rises, if the reading of the pressure gauge B does not rise for a long time, indicating that the outlet valve B is tightly closed, otherwise, not tightly closing the outlet valve B;
if the reading of the pressure gauge B is obviously reduced compared with the reading of the pressure gauge of the main pipe, which indicates that the check valve B is not closed tightly, the phenomenon of overpressure damage of an inlet pipeline can occur in the process of isolating the standby condensate pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910487755.1A CN110207014B (en) | 2019-06-05 | 2019-06-05 | Protection system for preventing overpressure at inlet of condensate pump and operation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910487755.1A CN110207014B (en) | 2019-06-05 | 2019-06-05 | Protection system for preventing overpressure at inlet of condensate pump and operation method |
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| Publication Number | Publication Date |
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| CN110207014A CN110207014A (en) | 2019-09-06 |
| CN110207014B true CN110207014B (en) | 2020-09-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910487755.1A Expired - Fee Related CN110207014B (en) | 2019-06-05 | 2019-06-05 | Protection system for preventing overpressure at inlet of condensate pump and operation method |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN202074505U (en) * | 2011-05-20 | 2011-12-14 | 济南海川投资集团有限公司 | Heat-conducting oil furnace tial-gas waste heat heating condensed water device |
| CN203383865U (en) * | 2013-08-15 | 2014-01-08 | 国家电网公司 | System for recycling boiler exhaust smoke waste heat based on screw expander |
| CN203874610U (en) * | 2014-05-28 | 2014-10-15 | 榆林学院 | Device for removing super fine particulate matters in smoke by use of dead steam in thermal power plant |
| CN205208540U (en) * | 2015-11-26 | 2016-05-04 | 中国能源建设集团浙江省电力设计院有限公司 | Vacuum deaerator system of backpressure unit |
| CN105910092A (en) * | 2015-11-26 | 2016-08-31 | 中国能源建设集团浙江省电力设计院有限公司 | Vacuum deaerator system of backpressure unit and condensed water circulation method |
| CN206111506U (en) * | 2016-07-05 | 2017-04-19 | 华润电力（常熟）有限公司 | Condensate pump frequency conversion automatic control system |
-
2019
- 2019-06-05 CN CN201910487755.1A patent/CN110207014B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202074505U (en) * | 2011-05-20 | 2011-12-14 | 济南海川投资集团有限公司 | Heat-conducting oil furnace tial-gas waste heat heating condensed water device |
| CN203383865U (en) * | 2013-08-15 | 2014-01-08 | 国家电网公司 | System for recycling boiler exhaust smoke waste heat based on screw expander |
| CN203874610U (en) * | 2014-05-28 | 2014-10-15 | 榆林学院 | Device for removing super fine particulate matters in smoke by use of dead steam in thermal power plant |
| CN205208540U (en) * | 2015-11-26 | 2016-05-04 | 中国能源建设集团浙江省电力设计院有限公司 | Vacuum deaerator system of backpressure unit |
| CN105910092A (en) * | 2015-11-26 | 2016-08-31 | 中国能源建设集团浙江省电力设计院有限公司 | Vacuum deaerator system of backpressure unit and condensed water circulation method |
| CN206111506U (en) * | 2016-07-05 | 2017-04-19 | 华润电力（常熟）有限公司 | Condensate pump frequency conversion automatic control system |
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