CN213513854U - Low-temperature economizer quick water discharge and online leakage detection isolation system - Google Patents
Low-temperature economizer quick water discharge and online leakage detection isolation system Download PDFInfo
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- CN213513854U CN213513854U CN202022559628.9U CN202022559628U CN213513854U CN 213513854 U CN213513854 U CN 213513854U CN 202022559628 U CN202022559628 U CN 202022559628U CN 213513854 U CN213513854 U CN 213513854U
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 30
- 238000001514 detection method Methods 0.000 title claims abstract description 17
- 238000002955 isolation Methods 0.000 title claims abstract description 17
- 239000010865 sewage Substances 0.000 claims abstract description 23
- 238000010926 purge Methods 0.000 claims abstract description 13
- 238000003860 storage Methods 0.000 claims abstract description 8
- 238000007599 discharging Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 239000007789 gas Substances 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 239000002918 waste heat Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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Abstract
本实用新型公开了一种低温省煤器快速放水和在线查漏隔离系统，低温省煤器进口管路上设置有进口母管总阀，各换热器模块的入口处均设置有换热器模块入口管路支阀，低温省煤器出口管路上设置有出口母管总阀，各换热器模块的出口处均设置有换热器模块出口管路支阀；所述低温省煤器排污系统管路与低温省煤器进出口大集箱及换热器模块的集箱连接；低温省煤器排气系统管路与低温省煤器出口管路的最高点相连通；压缩空气储罐的出口经压缩空气吹扫系统管路与各换热器模块的出口相连通，各换热器模块的出口处均设置有压力变送器，该系统能够实现低温省煤器快速放水及在线查漏隔离，提高系统运行的稳定性和经济性。
The utility model discloses a low-temperature economizer rapid water discharge and on-line leak detection isolation system. An inlet main valve is arranged on the inlet pipeline of the low-temperature economizer, and heat exchanger modules are arranged at the inlets of each heat exchanger module. The inlet pipeline branch valve, the low temperature economizer outlet pipeline is provided with the outlet main valve, and the outlet of each heat exchanger module is provided with the heat exchanger module outlet pipeline branch valve; the low temperature economizer sewage system The pipeline is connected with the low temperature economizer inlet and outlet large headers and the header of the heat exchanger module; the low temperature economizer exhaust system pipeline is connected with the highest point of the low temperature economizer outlet pipeline; the compressed air storage tank The outlet is connected with the outlet of each heat exchanger module through the pipeline of the compressed air purging system. The outlet of each heat exchanger module is equipped with a pressure transmitter. The system can realize rapid water discharge of the low-temperature economizer and online leak detection. isolation, improve the stability and economy of system operation.
Description
Technical Field
The utility model belongs to the technical field of power plant boiler flue gas waste heat recovery, a low temperature economizer is fast to be discharged water and online leak hunting isolated system is related to.
Background
In the actual operation process of the boiler, the exhaust gas temperature at the outlet of the air preheater is mostly higher than the design value requirement due to the influences of heating surface ash deposition, coal type change for combustion, insufficient operation level and the like. Aiming at the problems of low boiler efficiency, low efficiency of an electrostatic dust collector, large water consumption of a wet desulphurization system and the like caused by high exhaust gas temperature at the outlet of an air preheater, the exhaust gas temperature is generally reduced by adopting a flue gas waste heat recovery technology. In the flue gas waste heat utilization mode of the power station boiler, the most widely applied mode is the mode of additionally arranging a heat exchanger at a tail flue of the boiler, namely a low-temperature economizer system.
Low temperature economizer systems have been rapidly developed in recent years against the large background of comprehensive ultra-low emissions and energy-saving retrofit of coal-fired power plants. Most of low-temperature economizer systems are in centralized transformation, so that the problems of incomplete design, insufficient initial operation experience and the like exist, and the leakage condition of a heat exchange tube is easy to occur in the operation process of the low-temperature economizer. After the heat exchange tube of the low-temperature economizer leaks, the specific leakage module position is generally difficult to judge in the operation process, most of the modules of the low-temperature economizer are withdrawn from operation, and after a standby unit is stopped, each module is pressed and checked for leakage, so that the low-temperature economizer module without a leakage point cannot be put into operation for a long time, the coal consumption of the unit and the efficiency of an electrostatic dust collector are influenced, and when the environmental temperature in the northern area is lower, the heat exchange tube is easily frozen and secondarily leaked by pressing and checking each module after the boiler is stopped.
When the environmental temperature in northern areas is lower, the heat exchange tube frost crack caused by the fact that accumulated water cannot be drained or water cannot be drained timely easily occurs when the low-temperature economizer system is withdrawn from operation, so that the low-temperature economizer system cannot be put into operation timely, and the safe operation of tail equipment such as an electrostatic dust collector and a draught fan is threatened.
The problems of the low-temperature economizer in the operation process seriously restrict the large-scale application of a low-temperature economizer system, particularly in northern cold regions, so that a system capable of realizing quick water drainage and online leakage detection and isolation of the low-temperature economizer is urgently needed.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned prior art's shortcoming, provide a low temperature economizer quick drainage and online leak hunting isolated system, this system and method can realize that low temperature economizer quick drainage and online leak hunting are kept apart, improve the stability and the economic nature of system operation.
In order to achieve the purpose, the low-temperature economizer quick water discharge and online leakage detection isolation system comprises a low-temperature economizer sewage discharge system pipeline, a low-temperature economizer exhaust system pipeline, a compressed air storage tank and a compressed air purging system pipeline;
the low-temperature economizer comprises a low-temperature economizer inlet pipeline, a low-temperature economizer outlet pipeline and a plurality of heat exchanger modules, wherein the inlet of each heat exchanger module is communicated with the low-temperature economizer inlet pipeline, the outlet of each heat exchanger module is communicated with the low-temperature economizer outlet pipeline, an inlet main pipe main valve is arranged on the low-temperature economizer inlet pipeline, a heat exchanger module inlet pipeline branch valve is arranged at the inlet of each heat exchanger module, an outlet main pipe main valve is arranged on the low-temperature economizer outlet pipeline, and a heat exchanger module outlet pipeline branch valve is arranged at the outlet of each heat exchanger module;
the low-temperature economizer sewage discharge system pipeline is connected with a large collection box at the inlet and the outlet of the low-temperature economizer and a collection box of the heat exchanger module; the low-temperature economizer exhaust system pipeline is communicated with the highest point of the low-temperature economizer outlet pipeline; the outlet of the compressed air storage tank is communicated with the outlet of each heat exchanger module through a compressed air purging system pipeline, and the outlet of each heat exchanger module is provided with a pressure transmitter.
The system also comprises a low-temperature economizer sewage discharge and exhaust pipeline collection main pipe, wherein the low-temperature economizer sewage discharge system pipeline and the low-temperature economizer exhaust system pipeline are communicated with the low-temperature economizer sewage discharge and exhaust pipeline collection main pipe.
The main pipe main valve of the sewage draining system, the main pipe main valve of the outlet, the branch valve of the outlet pipeline of the heat exchanger module, the main pipe main valve of the inlet and the branch valve of the inlet pipeline of the heat exchanger module are all electric valves;
the drain valve of the large header at the inlet and the outlet of the low-temperature economizer and the drain valve of the heat exchanger module header are both manual valves.
The lowest positions of the low-temperature economizer inlet pipeline, the low-temperature economizer outlet pipeline and the water inlet header of the heat exchanger module are all communicated with a low-temperature economizer sewage discharging system pipeline, and the low-temperature economizer sewage discharging system pipeline is communicated with a low-temperature economizer sewage discharging and exhaust pipeline collecting main pipe.
And an exhaust system pipeline exhaust valve is arranged on the low-temperature economizer exhaust system pipeline.
A compressed air main pipe main valve is arranged on the compressed air purging system pipeline, and a compressed air branch pipe branch valve is arranged between the compressed air purging system pipeline and the outlet of each heat exchanger module.
The main valve of the compressed air main pipe and the branch valves of the compressed air branch pipes are all electric valves.
The blowdown valve of the large header at the inlet and the outlet of the low-temperature economizer and the blowdown valve of the heat exchanger module header are normally open valves, and the main pipe main valve of the blowdown system is closed when the low-temperature economizer operates.
The utility model discloses following beneficial effect has:
the utility model discloses a low temperature economizer quick drainage and online leak hunting isolated system when concrete operation, low temperature economizer system normal operating, close the female pipe main valve of drainage system and exhaust system pipeline discharge valve, open the big collection case blowoff valve of low temperature economizer import and export and heat exchanger module collection case blowoff valve, when low temperature economizer stops the operation, close import female pipe main valve and export female pipe main valve, open the female pipe main valve of drainage system, can discharge more than 90% of working medium in the low temperature economizer in 15min, avoid the low temperature economizer to freeze because long-time deposit water; after the water discharge is finished, the heat exchanger modules are inflated and discharged through compressed gas, and the water discharge of each heat exchanger module is guaranteed to be clean. In addition, the low-temperature economizer system can open or close the inlet and outlet main valve of the low-temperature economizer and the inlet and outlet branch valves of each heat exchanger module during operation to realize online leakage detection and isolation of the leaked heat exchanger modules, the system is simple, the workload of operation, maintenance and repair is low, the frost cracking condition of the heat exchange tubes of the low-temperature economizer in northern cold regions can be relieved, the online leakage detection and isolation of the leaked modules are realized, the anti-freezing capacity of the low-temperature economizer is greatly improved, and the stability and the economy of the system operation are improved.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
The system comprises a heat exchanger module 1, a low-temperature economizer inlet pipeline 2, a main inlet pipe main valve 201, a main heat exchanger module inlet pipeline branch valve 202, a low-temperature economizer outlet pipeline 3, a main outlet pipe main valve 301, a main heat exchanger module outlet pipeline branch valve 302, a low-temperature economizer blow-down system pipeline 4, a main blow-down system pipe main valve 401, a large low-temperature economizer inlet and outlet header blow-down valve 402, a heat exchanger module header blow-down valve 403, a low-temperature economizer exhaust system pipeline 5, an exhaust system pipeline exhaust valve 501, a compressed air blow-down system pipeline 6, a compressed air main pipe main valve 601, a compressed air branch pipe valve 602, a compressed air storage tank 7, a low-temperature economizer blow-down pipe 8, an exhaust pipeline collection main pipe and a pressure transmitter 9.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings:
referring to fig. 1, the low-temperature economizer rapid water discharge and online leak detection isolation system of the present invention comprises a low-temperature economizer blowdown system pipeline 4, a low-temperature economizer exhaust system pipeline 5, a compressed air storage tank 7 and a compressed air purging system pipeline 6; the low-temperature economizer comprises a low-temperature economizer inlet pipeline 2, a low-temperature economizer outlet pipeline 3 and a plurality of heat exchanger modules 1, wherein the inlet of each heat exchanger module 1 is communicated with the low-temperature economizer inlet pipeline 2, the outlet of each heat exchanger module 1 is communicated with the low-temperature economizer outlet pipeline 3, an inlet main pipe main valve 201 is arranged on the low-temperature economizer inlet pipeline 2, a heat exchanger module inlet pipeline branch valve 202 is arranged at the inlet of each heat exchanger module 1, an outlet main pipe main valve 301 is arranged on the low-temperature economizer outlet pipeline 3, and a heat exchanger module outlet pipeline branch valve 302 is arranged at the outlet of each heat exchanger module 1; the low-temperature economizer sewage system pipeline 4 is connected with a large collection box at the inlet and the outlet of the low-temperature economizer and a collection box of the heat exchanger module 1; the low-temperature economizer exhaust system pipeline 5 is communicated with the highest point of the low-temperature economizer outlet pipeline 3; the outlet of the compressed air storage tank 7 is communicated with the outlets of the heat exchanger modules 1 through the compressed air purging system pipeline 6, and the outlets of the heat exchanger modules 1 are provided with pressure transmitters 9.
The utility model discloses still collect female pipe 8 including low temperature economizer blowdown, exhaust pipe, wherein, low temperature economizer blowdown system pipeline 4 and low temperature economizer exhaust system pipeline 5 collect female pipe 8 with low temperature economizer blowdown, exhaust pipe and are linked together.
The blowdown system main pipe main valve 401, the outlet main pipe main valve 301, the heat exchanger module outlet pipeline branch valve 302, the inlet main pipe main valve 201 and the heat exchanger module inlet pipeline branch valve 202 are all electrically operated valves; the blowdown valve 402 of the inlet and outlet large header of the low-temperature economizer and the blowdown valve 403 of the header of the heat exchanger module are both manual valves.
The lowest part of the inlet header of the low-temperature economizer inlet pipeline 2, the low-temperature economizer outlet pipeline 3 and the heat exchanger module 1 is communicated with a low-temperature economizer sewage discharging system pipeline 4, and the low-temperature economizer sewage discharging system pipeline 4 is communicated with a low-temperature economizer sewage discharging and exhaust pipeline collecting main pipe 8.
An exhaust system pipeline exhaust valve 501 is arranged on the low-temperature economizer exhaust system pipeline 5.
A compressed air main pipe main valve 601 is arranged on the compressed air purging system pipeline 6, a compressed air branch valve 602 is arranged between the compressed air purging system pipeline 6 and the outlet of each heat exchanger module 1, and the compressed air main pipe main valve 601 and the compressed air branch valve 602 are all electric valves.
The blowdown valve 402 of the large header at the inlet and the outlet of the low-temperature economizer and the blowdown valve 403 of the heat exchanger module header are both normally open valves, and the main pipe main valve 401 of the blowdown system is closed when the low-temperature economizer operates.
The utility model discloses a concrete working process does:
when the low-temperature economizer system normally operates, closing a main pipe main valve 401 of a blowdown system, opening an exhaust valve 501 of an exhaust system pipeline, uniformly exhausting all heat exchanger modules 1, closing the exhaust valve 501 of the exhaust system pipeline after the low-temperature economizer is filled with water, opening a blowdown valve 402 of an inlet/outlet large header of the low-temperature economizer and a blowdown valve 403 of a heat exchanger module header, closing the main pipe main valve 201 of the inlet and the main pipe main valve 301 of the outlet when the low-temperature economizer stops operating, and opening the main pipe main valve 401 of the blowdown system to drain water;
after water drainage is finished, keeping an inlet pipeline branch valve 202 of the heat exchanger module open, closing an outlet pipeline branch valve 302 of the heat exchanger module, opening a main compressed air pipe main valve 601, sequentially opening branch valves 602 of each compressed air branch pipe, and performing air inflation and water drainage operation on the heat exchanger module 1 to ensure that water drainage of each heat exchanger module 1 is finished;
the outlet header pipelines of the heat exchanger modules 1 are provided with pressure transmitters 9, the working medium in the low-temperature economizer is incompressible fluid, and when leakage occurs, the pressure detected by the pressure transmitters 9 is obviously reduced, so that the pressure change of the working medium in the heat exchanger modules 1 is observed by isolating the heat exchanger modules 1 to judge whether the low-temperature economizer leaks;
closing the inlet main pipe main valve 201 and the outlet main pipe main valve 301, and after 10min, observing that the pressure drop amplitude detected by the pressure transmitter 9 is greater than or equal to a preset amplitude, indicating that the whole low-temperature economizer leaks;
when the whole low-temperature economizer leaks, the inlet main pipe main valve 201 is opened to restore the pressure of the water side of all the heat exchanger modules 1 to normal, the inlet pipeline branch valves 202 and the outlet pipeline branch valves 302 of all the heat exchanger modules are closed, and when the pressure detected by any one pressure transmitter 9 is reduced, the heat exchanger module 1 corresponding to the pressure transmitter 9 leaks.
Claims (8)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022559628.9U CN213513854U (en) | 2020-11-06 | 2020-11-06 | Low-temperature economizer quick water discharge and online leakage detection isolation system |
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| CN202022559628.9U CN213513854U (en) | 2020-11-06 | 2020-11-06 | Low-temperature economizer quick water discharge and online leakage detection isolation system |
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| CN213513854U true CN213513854U (en) | 2021-06-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112228860A (en) * | 2020-11-06 | 2021-01-15 | 西安西热锅炉环保工程有限公司 | A low-temperature economizer rapid water discharge and online leak detection and isolation system and method |
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- 2020-11-06 CN CN202022559628.9U patent/CN213513854U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112228860A (en) * | 2020-11-06 | 2021-01-15 | 西安西热锅炉环保工程有限公司 | A low-temperature economizer rapid water discharge and online leak detection and isolation system and method |
| CN112228860B (en) * | 2020-11-06 | 2025-01-28 | 西安西热锅炉环保工程有限公司 | A low-temperature economizer rapid water discharge and online leak detection isolation system and method |
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