CN102607325A - Automatic wall temperature control system for preventing low-temperature corrosion of low grade residual heat recovery device - Google Patents
Automatic wall temperature control system for preventing low-temperature corrosion of low grade residual heat recovery device Download PDFInfo
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- CN102607325A CN102607325A CN2012100592170A CN201210059217A CN102607325A CN 102607325 A CN102607325 A CN 102607325A CN 2012100592170 A CN2012100592170 A CN 2012100592170A CN 201210059217 A CN201210059217 A CN 201210059217A CN 102607325 A CN102607325 A CN 102607325A
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- control system
- heat recovery
- residual heat
- wall temperature
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- 238000011084 recovery Methods 0.000 title claims abstract description 47
- 230000007797 corrosion Effects 0.000 title claims abstract description 35
- 238000005260 corrosion Methods 0.000 title claims abstract description 35
- 239000003546 flue gas Substances 0.000 claims abstract description 38
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000012530 fluid Substances 0.000 claims description 38
- 239000002918 waste heat Substances 0.000 claims description 26
- 239000003507 refrigerant Substances 0.000 claims description 24
- 239000007789 gas Substances 0.000 claims description 19
- 238000010438 heat treatment Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 239000002184 metal Substances 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 4
- 239000000779 smoke Substances 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 238000006477 desulfuration reaction Methods 0.000 abstract 1
- 230000023556 desulfurization Effects 0.000 abstract 1
- 238000009776 industrial production Methods 0.000 abstract 1
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 230000003009 desulfurizing effect Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Abstract
The invention relates to an automatic wall temperature control system for preventing low-temperature corrosion of a low-grade residual heat recovery device, belonging to the technical field of flue gas desulfurization environmental protection and energy saving technology applied in power plants. The automatic wall temperature control system comprises a tertiary low-temperature heater, a residual heat recovery shell body, a residual heat recovery heat exchanger, a variable frequency pump, a low-temperature working medium system, a high-temperature working medium system and a first low-temperature heater which are coordinately arranged in sequence, wherein a metal wall temperature sensor is arranged on the residual heat recovery heat exchanger; and a flue gas temperature sensor and the variable frequency pump are connected each other through signals, so are the metal wall temperature sensor and the low-temperature working medium system. By adopting the said technology, the automatic wall temperature control system disclosed by the invention can effectively prevent the low-grade residual heat recovery device from low-temperature corrosion, greatly reduce the temperature of the exhaust smoke, prevent from low-temperature corrosion, prolong the service life of the equipment and ensure safe and stable system operation; and the automatic wall temperature control system can reduce the low-grade residual heat recovery temperature to below 80 DEG to recover residual heat to the maximum extent, thereby improving the economic benefit of power plants. The automatic control system is applicable for industrial production.
Description
Technical field
The invention belongs to Coal,steam plant with FGD environmental protection and field of energy-saving technology, be specifically related to a kind of wall temperature automatic control system that thermal power plant fired power generating unit flue-gas desulfurizing engineering, power plant unit flue gas cool-down system, chemical field flue gas waste heat recovery or cooling system etc. prevent the cold end corrosion of low grade residual heat retracting device that is used for.
Prior art
In traditional concept, be lower than the heat that heat below 200 ℃ is considered to not have value, wasted by direct discharging.Along with the growing tension of the energy, the increase of energy-saving and emission-reduction pressure, people have paid attention to the energy of this part gradually.But in practical application,, when tube wall temperature is lower than certain value, can dewfall be adsorbed on the metal surface, cause the corrosion of waste-heat recovery device owing to contain gas such as sulfur dioxide in the flue gas.Consider this situation, existing low grade residual heat retracting device can only be reduced in flue-gas temperature more than 120 ℃.
Summary of the invention
To the problems referred to above that exist in the prior art, the object of the present invention is to provide a kind of wall temperature automatic control system that systems such as thermal power plant fired power generating unit flue-gas desulfurizing engineering prevent the cold end corrosion of low grade residual heat retracting device that is used for.
The described wall temperature automatic control system that prevents the cold end corrosion of low grade residual heat retracting device; Comprise the third level low-pressure heater and the first order low-pressure heater that are used for heating working medium; Be equipped with waste-heat recovery device, variable frequency pump and working medium control system between described third level low-pressure heater and the first order low-pressure heater successively; It is characterized in that described working medium control system comprises cryogenic fluid system and high temperature refrigerant system that parallel connection is provided with; Described waste-heat recovery device comprises the waste heat recovery housing and is arranged on the heat recovery heat exchanger in the waste heat recovery housing; Be equipped with the flue-gas temperature sensor on the described waste heat recovery housing; The tube wall temperature sensor is set on the described heat recovery heat exchanger, and described flue-gas temperature sensor is connected through signal respectively with the cryogenic fluid system with variable frequency pump, tube wall temperature sensor.
The described wall temperature automatic control system that prevents the cold end corrosion of low grade residual heat retracting device; It is characterized in that described cryogenic fluid system comprises the cryogenic fluid control valve; Described cryogenic fluid control valve one end is connected with the outlet of first order low-pressure heater; The other end is connected with the inlet of variable frequency pump, and the cryogenic fluid control valve is connected through signal with the tube wall temperature sensor.
The described wall temperature automatic control system that prevents the cold end corrosion of low grade residual heat retracting device; It is characterized in that described high temperature refrigerant system comprises second level low-pressure heater and high temperature refrigerant control valve; Described second level low-pressure heater inlet connects with the outlet of first order low-pressure heater; Its outlet is connected with high temperature refrigerant control valve one end, and the described high temperature refrigerant control valve other end is connected with the inlet of variable frequency pump.
The described wall temperature automatic control system that prevents the cold end corrosion of low grade residual heat retracting device is characterized in that described working medium is water or other organic working medium, R-123 cold-producing medium etc.
The described wall temperature automatic control system that prevents the cold end corrosion of low grade residual heat retracting device; It is characterized in that described heat recovery heat exchanger inlet is connected with the frequency conversion delivery side of pump, the outlet of heat recovery heat exchanger is connected with the inlet of third level low-pressure heater.
The described wall temperature automatic control system that prevents the cold end corrosion of low grade residual heat retracting device; It is characterized in that described waste heat recovery housing one end is provided with gas approach; The other end is provided with exhanst gas outlet; Described flue-gas temperature sensor is arranged on exhanst gas outlet one end, and flue gas flow direction and working medium flow to opposite.
The described wall temperature automatic control system that prevents the cold end corrosion of low grade residual heat retracting device is characterized in that described high temperature refrigerant temperature is 70-99 ℃, and the cryogenic fluid temperature is 35-60 ℃, specifically confirms according to on-site actual situations.
The described wall temperature automatic control system that prevents the cold end corrosion of low grade residual heat retracting device is characterized in that described cryogenic fluid control valve is an automatic regulating valve, and the cryogenic fluid control valve is connected through signal with the tube wall temperature sensor.
The described wall temperature automatic control system that prevents the cold end corrosion of low grade residual heat retracting device is characterized in that described high temperature refrigerant control valve is the hand control valve.
The described wall temperature automatic control system that prevents the cold end corrosion of low grade residual heat retracting device is characterized in that flue-gas temperature is 140-200 ℃ in the described gas approach, and flue-gas temperature is lower than 80 ℃ in the exhanst gas outlet.
Through adopting above-mentioned technology, compared with prior art, beneficial effect of the present invention is following:
1) working medium of the present invention adopts high temperature refrigerant and cryogenic fluid to mix, and control valve is set respectively, and according to tangible needs, the temperature of working medium is easy to regulate, and is easy to operate, thereby can guarantee the wall temperature of waste-heat recovery device;
2) the present invention is provided with the tube wall temperature sensor on heat recovery heat exchanger; The tube wall temperature sensor is connected through signal with cryogenic fluid control valve in the cryogenic fluid system, and when too high or too low for temperature, temperature sensor is passed to the cryogenic fluid control valve with signal; The cryogenic fluid control valve is transferred big or is turned down; Thereby the temperature that guarantees mixed working fluid has avoided wall temperature to cross when hanging down within the scope of setting, and the corrosive deposit dewfall in the flue gas is adsorbed on the metal surface; Corrosion is provided with, and prolongs the service life of equipment;
3) the present invention is equipped with the flue-gas temperature sensor at the smoke outlet of waste heat recovery housing; The flue-gas temperature sensor is connected through signal with variable frequency pump, and when port of export flue-gas temperature was too high or too low, the flue-gas temperature sensor was passed to variable frequency pump with signal; Variable frequency pump is transferred the flow of working medium big or is turned down; Thereby guarantee that the flue-gas temperature that exports out can be not too high, effectively reclaimed the heat of flue gas, improved economic benefit;
4) the present invention is through adopting the simple control waste-heat recovery device heat exchange metallic walls temperature control system of control one cover; Can effectively prevent low grade residual heat retracting device generation cold end corrosion; On the prior art basis, significantly reduce exhaust gas temperature, the present invention can be reduced to the temperature value that low grade residual heat reclaims below 80 ℃, compares between be reduced to prior art 120～140 ℃; At utmost reclaim smoke discharging residual heat, thereby improve the economic benefit of power plant;
5) system of the present invention can make low grade residual heat retracting device system under the lower situation of flue-gas temperature, regulates low grade residual heat retracting device metal temperature within setting range, thus constant flue gas waste heat recovery system tube wall temperature; Prevent cold end corrosion, prolonged the service life of equipment, guarantee the safe and stable operation of system; It is simple in structure; Easy to operate, good in economic efficiency, be suitable for suitability for industrialized production and use.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Among the figure: 1-third level low-pressure heater, 2-high temperature refrigerant control valve, 3-second level low-pressure heater; 4-cryogenic fluid control valve, 5-first order low-pressure heater, 6-variable frequency pump; 7-tube wall temperature sensor, 8-flue-gas temperature sensor, 9-waste-heat recovery device; 9a-waste heat recovery housing, the 9b-heat recovery heat exchanger.
The specific embodiment
Below in conjunction with Figure of description the present invention is done further description:
As shown in Figure 1; Prevent the wall temperature automatic control system of low grade residual heat retracting device cold end corrosion; Comprise the third level low-pressure heater 1 and first order low-pressure heater 5 that are used for heating working medium, be equipped with waste-heat recovery device 9, variable frequency pump 6 and working medium control system between described third level low-pressure heater 1 and the first order low-pressure heater 5 successively, described working medium control system comprises cryogenic fluid system and the high temperature refrigerant system that parallel connection is provided with; Wherein the cryogenic fluid system comprises self-regulating cryogenic fluid control valve 4; Described cryogenic fluid control valve 4 one ends are connected with the outlet of first order low-pressure heater 5, and the other end is connected with the inlet of variable frequency pump 6, and cryogenic fluid control valve 4 and tube wall temperature sensor 7 are connected through signal; The high temperature refrigerant system comprises second level low-pressure heater 3 and high temperature refrigerant control valve 2; High temperature refrigerant control valve 2 is the hand control valve, and is just moving after the operated by rotary motion, and low-pressure heater 3 inlets in the described second level connect with the outlet of first order low-pressure heater 5; Its outlet is connected with high temperature refrigerant control valve 2 one ends, and described high temperature refrigerant control valve 2 other ends are connected with the inlet of variable frequency pump 6.Described waste-heat recovery device 9 comprises waste heat recovery housing 9a and is arranged on the heat recovery heat exchanger 9b in the waste heat recovery housing 9a; Be equipped with flue-gas temperature sensor 8 on the described waste heat recovery housing 9a; On the described heat recovery heat exchanger 9b tube wall temperature sensor 7 is set, flue-gas temperature sensor 8 is connected through signal respectively with the intrasystem cryogenic fluid control valve 4 of cryogenic fluid with variable frequency pump 6, tube wall temperature sensor 7.Working medium of the present invention is water or organic working medium, like R-123 cold-producing medium etc.
As shown in the figure, heat recovery heat exchanger 9b inlet is connected with the outlet of variable frequency pump 6, and the outlet of heat recovery heat exchanger 9b is connected with the inlet of third level low-pressure heater 1; Waste heat recovery housing 9a one end is provided with gas approach, and the other end is provided with exhanst gas outlet, and described flue-gas temperature sensor 8 is arranged on exhanst gas outlet one end; And flue gas flow direction is opposite with the working medium flow direction, and the high temperature refrigerant temperature is 70-99 ℃, and the cryogenic fluid temperature is 35-60 ℃; Specifically confirm according to on-site actual situations; Middle and high temperature refrigerant temperature of the present invention is 99 ℃, and the cryogenic fluid temperature is 56 ℃, and mixing back working medium temperature is about 65 ℃; Flue-gas temperature is 140-200 ℃ in the gas approach, and flue-gas temperature is lower than 80 ℃ in the exhanst gas outlet.
Embodiments of the invention are the technical scheme of confirming of the best of realization the application; But not unique technical scheme; Therefore protection scope of the present invention is not limited in this, three embodiment in the time of should having the upper limit, middle limit, lower limit or different proportioning parameter to select at least.
Embodiment
The present invention is provided with wall temperature control system in low grade residual heat retracting device system, be used to control metal temperature, prevents cold end corrosion, and is specific as follows:
The low grade residual heat retracting device adopts gets high temperature, cryogenic fluid phase hybrid mode respectively; According to calculating; Working medium from first order low-pressure heater 1 exports and the suitable flow of different temperatures is taken out in low-pressure heater 3 outlets in the second level respectively after mix, makes the working medium temperature within design temperature; Through variable frequency pump 6 mixed working medium is sent in the low grade residual heat retracting device 9, working medium flows into third level low-pressure heater 1 inlet after flue gas heating in low grade residual heat retracting device 9.
If first order low-pressure heater 1 outlet temperature changes by (adjusting of second level low-pressure heater 3 is with first order low-pressure heater 1), the mixed working fluid temperature will change, and depart from design temperature; Thereby cause that tube wall temperature changes the generation cold end corrosion, feed back to arithmetic unit through the temperature point monitoring of tube wall temperature sensor 7 this moment; Through calculating, the cryogenic fluid control valve 4 on the pipeline is drawn in 1 outlet of signal instruction to first order low-pressure heater, through controlling its valve opening; The flow of control cryogenic fluid; Thereby make tube wall temperature within setting range, avoid taking place cold end corrosion, guarantee security of system stable operation.
If low grade residual heat retracting device exit gas temperature changes, flue-gas temperature sensor 8 collecting temperature signals are through computing; Signal instruction to variable frequency pump 6; Regulate the frequency of variable frequency pump 6, thereby control gets into the working medium flow of low grade residual heat retracting device, reach control working medium heat exchange total amount; Control exhanst gas outlet temperature, the purpose of assurance whole system safe and stable operation.
Claims (10)
1. prevent the wall temperature automatic control system of low grade residual heat retracting device cold end corrosion; Comprise the third level low-pressure heater (1) and the first order low-pressure heater (5) that are used for heating working medium; Be equipped with waste-heat recovery device (9), variable frequency pump (6) and working medium control system between described third level low-pressure heater (1) and the first order low-pressure heater (5) successively; It is characterized in that described working medium control system comprises cryogenic fluid system and high temperature refrigerant system that parallel connection is provided with; Described waste-heat recovery device (9) comprises waste heat recovery housing (9a) and is arranged on the heat recovery heat exchanger (9b) in the waste heat recovery housing (9a); Be equipped with flue-gas temperature sensor (8) on the described waste heat recovery housing (9a); Tube wall temperature sensor (7) is set on the described heat recovery heat exchanger (9b), and described flue-gas temperature sensor (8) is connected through signal respectively with the cryogenic fluid system with variable frequency pump (6), tube wall temperature sensor (7).
2. the wall temperature automatic control system that prevents the cold end corrosion of low grade residual heat retracting device according to claim 1; It is characterized in that described cryogenic fluid system comprises cryogenic fluid control valve (4); Described cryogenic fluid control valve (4) one ends are connected with the outlet of first order low-pressure heater (5); The other end is connected with the inlet of variable frequency pump (6), and cryogenic fluid control valve (4) is connected through signal with tube wall temperature sensor (7).
3. the wall temperature automatic control system that prevents the cold end corrosion of low grade residual heat retracting device according to claim 1; It is characterized in that described high temperature refrigerant system comprises second level low-pressure heater (3) and high temperature refrigerant control valve (2); Described second level low-pressure heater (3) inlet connects with the outlet of first order low-pressure heater (5); Its outlet is connected with high temperature refrigerant control valve (2) one ends, and described high temperature refrigerant control valve (2) other end is connected with the inlet of variable frequency pump (6).
4. the wall temperature automatic control system that prevents the cold end corrosion of low grade residual heat retracting device according to claim 1 is characterized in that described working medium is water or organic working medium.
5. the wall temperature automatic control system that prevents the cold end corrosion of low grade residual heat retracting device according to claim 1; It is characterized in that described heat recovery heat exchanger (9b) inlet is connected with the outlet of variable frequency pump (6), the outlet of heat recovery heat exchanger (9b) is connected with the inlet of third level low-pressure heater (1).
6. the wall temperature automatic control system that prevents the cold end corrosion of low grade residual heat retracting device according to claim 1; It is characterized in that described waste heat recovery housing (9a) end is provided with gas approach; The other end is provided with exhanst gas outlet; Described flue-gas temperature sensor (8) is arranged on exhanst gas outlet one end, and flue gas flow direction and working medium flow to opposite.
7. the wall temperature automatic control system that prevents the cold end corrosion of low grade residual heat retracting device according to claim 1 is characterized in that described high temperature refrigerant temperature is 70-99 ℃, and the cryogenic fluid temperature is 35-60 ℃.
8. the wall temperature automatic control system that prevents the cold end corrosion of low grade residual heat retracting device according to claim 2; It is characterized in that described cryogenic fluid control valve (4) is an automatic regulating valve, cryogenic fluid control valve (4) is connected through signal with tube wall temperature sensor (7).
9. the wall temperature automatic control system that prevents the cold end corrosion of low grade residual heat retracting device according to claim 3 is characterized in that described high temperature refrigerant control valve (2) is the hand control valve.
10. the wall temperature automatic control system that prevents the cold end corrosion of low grade residual heat retracting device according to claim 6 is characterized in that flue-gas temperature is 140-200 ℃ in the described gas approach, and flue-gas temperature is lower than 80 ℃ in the exhanst gas outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210059217 CN102607325B (en) | 2012-03-08 | 2012-03-08 | Automatic wall temperature control system for preventing low-temperature corrosion of low grade residual heat recovery device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210059217 CN102607325B (en) | 2012-03-08 | 2012-03-08 | Automatic wall temperature control system for preventing low-temperature corrosion of low grade residual heat recovery device |
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| Publication Number | Publication Date |
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| CN102607325A true CN102607325A (en) | 2012-07-25 |
| CN102607325B CN102607325B (en) | 2013-06-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201210059217 Expired - Fee Related CN102607325B (en) | 2012-03-08 | 2012-03-08 | Automatic wall temperature control system for preventing low-temperature corrosion of low grade residual heat recovery device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103808200A (en) * | 2014-02-13 | 2014-05-21 | 浙江浙能温州发电有限公司 | Automatic regulating system for controlling temperature of working media of heat exchanger |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09318137A (en) * | 1996-05-30 | 1997-12-12 | Hitachi Plant Eng & Constr Co Ltd | Method of thermal storage in building structure |
| WO2004033971A1 (en) * | 2002-10-09 | 2004-04-22 | Alastair Robertson | Process and apparatus for cleaning and recovering heat energy of flue gases |
| CN100593683C (en) * | 2007-04-19 | 2010-03-10 | 上海发电设备成套设计研究院 | Automatic control system for wall temperature of boiler discharged smoke heat recovery heat exchanger |
| CN202074880U (en) * | 2011-03-15 | 2011-12-14 | 福建成信绿集成有限公司 | Automatic control system used in acid resistant dew point corrosion of a boiler smoke evacuation heat recovery heat exchanger |
| CN202485543U (en) * | 2012-03-08 | 2012-10-10 | 浙江清科电力科技有限公司 | Wall temperature automatic control system capable of preventing low-temperature corrosion to low-grade waste heat recovery device |
-
2012
- 2012-03-08 CN CN 201210059217 patent/CN102607325B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09318137A (en) * | 1996-05-30 | 1997-12-12 | Hitachi Plant Eng & Constr Co Ltd | Method of thermal storage in building structure |
| WO2004033971A1 (en) * | 2002-10-09 | 2004-04-22 | Alastair Robertson | Process and apparatus for cleaning and recovering heat energy of flue gases |
| CN100593683C (en) * | 2007-04-19 | 2010-03-10 | 上海发电设备成套设计研究院 | Automatic control system for wall temperature of boiler discharged smoke heat recovery heat exchanger |
| CN202074880U (en) * | 2011-03-15 | 2011-12-14 | 福建成信绿集成有限公司 | Automatic control system used in acid resistant dew point corrosion of a boiler smoke evacuation heat recovery heat exchanger |
| CN202485543U (en) * | 2012-03-08 | 2012-10-10 | 浙江清科电力科技有限公司 | Wall temperature automatic control system capable of preventing low-temperature corrosion to low-grade waste heat recovery device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103808200A (en) * | 2014-02-13 | 2014-05-21 | 浙江浙能温州发电有限公司 | Automatic regulating system for controlling temperature of working media of heat exchanger |
| CN103808200B (en) * | 2014-02-13 | 2016-07-06 | 浙江浙能温州发电有限公司 | A kind of automatic regulating system controlling heat exchanger Temperature of Working |
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| CN102607325B (en) | 2013-06-12 |
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